JP6374050B1 - Steel support construction connection structure, connection method, and erection method - Google Patents

Abstract

The present invention provides a technique related to a connecting structure of a steel support that can avoid manual work at the face of a tunnel and improve safety and workability. A steel support connection structure includes a first top joint plate provided at each of the top ends of a pair of steel support erected in a circular arc shape built along a tunnel pit wall, and A second top joint plate, a female connecting portion recessed in the first top joint plate, and a male connecting portion projecting from the second top joint plate. It has a rod-shaped male locking member protruding from the second top end joint plate, and the female type connecting portion communicates with the opening hole formed through the first top end joint plate, and is connected to the male type. A male locking member inserted into the storage chamber from the insertion port is locked, including a casing having therein a storage chamber in which an insertion port into which the stop member can be inserted is formed. [Selection] Figure 2

Description

  The present invention relates to a connecting structure for a steel support.

As a construction method for constructing a tunnel, a NATM construction method (New Austrian Tunneling Method) is known. The NATM method is based on the idea of maintaining the stability of the tunnel by making effective use of the support capacity and strength of the natural ground, using spray concrete, rock bolts, and steel support as appropriate. This is a method for constructing an integrated tunnel structure.

  When a tunnel is constructed in the NATM construction method, when an arch-shaped steel support is installed, it is usually performed according to the procedure described below. First, a spraying machine is set in the vicinity of the face, the concrete is first sprayed on the face, and when this is completed, the sprayer is withdrawn. Next, a work vehicle equipped with an erector for installing a support work in the vicinity of the face is arranged, and an arch-shaped steel support work is built in the tunnel pit wall near the face by the erector, and when this is completed, the work vehicle is withdrawn. Next, the sprayer is placed again on the face, and the tunnel supporter built is embedded, and then the concrete is secondarily sprayed, and the sprayer is moved out.

  When installing steel supporters, hold the left and right steel supporters at the tip of the boom of heavy machinery such as an erector and drill jumbo, and then perform the installation work. A general method is to build in an arch shape by connecting the joint plates provided at the ends to each other and bolting them.

Japanese Patent No. 3381606

  However, according to the conventional connection structure of steel supports, the work scaffolds and heavy equipment booms built near the tunnel pit wall with the joint plates provided on the left and right steel supports being in contact with each other Personnel are placed in the man cage, etc. installed in the machine, and the personnel are moved to the vicinity of the top of the tunnel.The bolts are inserted between the steel support joints located near the top of the tunnel, and the bolts are inserted with It was necessary to perform a connecting operation such as fastening.

  The present invention has been made in view of the above problems, and its purpose is to avoid the manual work at the face of the tunnel and to improve the safety and workability of the steel support work. The object is to provide a technique related to the connecting structure.

The present invention is a connection structure for connecting a pair of steel support members divided into arcs built along the tunnel pit wall to each other at their top ends, and the pair of steel supports A first top end joint plate and a second top end joint plate which are respectively provided at the top end portions of the support work and are brought into contact with each other when the pair of steel support works are coupled; A female connecting portion recessed in the plate, and a male connecting portion protruding from the second top end joint plate, wherein the male connection portion protrudes from the second top end joint plate. It has a rod-shaped male locking member, and the female connecting portion communicates with the opening hole formed through the first top end joint plate, and the male locking member can be inserted. A casing having a storage chamber formed therein with an insertion opening formed therein, and inserted into the storage chamber from the insertion port To lock the mold locking member.

  By comprising as mentioned above, the technique regarding the connection structure of the steel supporter which can avoid the manual work in the face of a tunnel and can improve safety | security and workability | operativity can be provided.

  The female connecting portion includes a tapered hole formed in the storage chamber and having a tapered surface whose front diameter is reduced, and a plurality of circumferentially divided portions within the tapered hole and sliding along the tapered surface. A wedge-shaped female locking member movably disposed, a plurality of circumferential female locking grooves arranged in parallel on the inner surface of the female locking member, and pressing the female locking member forward A pressing member; and the male connecting portion further includes a plurality of circumferential male locking grooves arranged in parallel on the outer periphery of the male locking member, wherein the male locking member is the female locking member. When inserted from the insertion port of the mold connecting part, the male locking member moves the female locking member backward along the tapered surface against the pressing force of the pressing member. The male locking member is inserted into the storage chamber while expanding the inner surface of the female locking member, and the When the insertion of the mold locking member is completed, the female locking member is pushed back along the tapered surface by the pressing force of the pressing member, so that the inner surface of the female locking member is reduced in diameter. And the said male type | mold connection part and the said female type | mold connection part may be integrally connected by the said female side locking groove and the said male side locking groove engaging with each other.

  In addition, when the pair of steel support members are connected to the outer peripheral edge of the first top end joint plate, the second top end joint plate is guided to the insertion port of the female connecting portion. A guide member for guiding the male locking member may be provided.

  Further, the guide member may be provided so as to cover a part of the outer peripheral edge of the first top end joint plate.

  Moreover, the said guide member may be provided in 2 sides which form a corner | angular part in the outer periphery of the said 1st top end joint board.

  In addition, the guide member faces the face when the pair of steel support members are connected, of the upper guide wall provided on the upper edge of the first top end joint plate and the first top end joint plate. And a side guide wall provided on the side edge of the side.

  In the present invention, the first top end joint plate has a concave shape, and the second top end joint plate has a convex shape complementary to the concave shape of the first top end joint plate. By doing so, the first top end joint plate and the second top end joint plate are formed in surface contact with each other when the pair of steel support members are connected, and the pair of steel When the support is connected, the male locking member slides along the concave surface of the first top joint plate, so that the concave surface connects the male locking member to the female connection portion. You may function as a guide for guide | inducing to the said insertion port.

  Further, the female connecting portion is disposed in a most recessed area in the area of the first top joint plate having the concave shape, and the male locking member has the convex shape. You may arrange | position in the area | region which protruded most in the area | region of a 2nd top end joint board.

  In addition, the opening hole may have a tapered surface that increases in diameter from the inner surface side to the outer surface side in the thickness direction of the first top end joint plate.

  Moreover, the front-end | tip part of the said male latching member may be formed with the taper surface which diameter-reduces toward a front-end | tip.

  ADVANTAGE OF THE INVENTION According to this invention, the technique regarding the connection structure of the steel support construction which can avoid the manual work in the face of a tunnel and can improve safety | security and workability | operativity can be provided.

FIG. 1 is a side view of a tunnel support according to the first embodiment. FIG. 2 is a schematic diagram illustrating a connection structure that connects the left steel support and the right steel support according to the first embodiment. FIG. 3 is a diagram illustrating a first top joint plate according to the first embodiment. (A) shows the female connecting portion viewed from the outer surface side of the first top joint plate. (B) shows the female connecting portion viewed from the inner surface side of the first top joint plate. FIG. 4 is a view showing a second top end joint plate according to the first embodiment. The male type | mold connection part seen from the inner surface side of the 2nd top end joint board is shown to (a). (B) shows the male connecting portion viewed from the outer surface side of the second top joint plate. 5 is a cross-sectional view taken along the line XX in FIG. FIG. 6 is a top view of a work vehicle on which the erector device is mounted. FIG. 7 is a diagram illustrating a state in which the female connector and the male connector according to Embodiment 1 are connected. FIG. 8 is a diagram for explaining a modification of the first embodiment. FIG. 9 is a view for explaining a connecting structure of steel supporters according to the second embodiment. (A) is a longitudinal cross-sectional view of the 1st top end joint board vicinity in the left side steel support. (B) is the A arrow front view of (a). (C) is a BB arrow directional cross-sectional view of (a). FIG. 10 is a diagram illustrating an operation when connecting the left steel support and the right steel support in the second embodiment. FIG. 11A is a diagram illustrating a guide member according to a modification of the second embodiment. FIG. 11B is a diagram illustrating a guide member according to a modification of the second embodiment. FIG. 12 is a view for explaining a connecting structure of a steel support according to the third embodiment. (A) is a longitudinal cross-sectional view of the 1st top end joint board vicinity in the left side steel support construction concerning Embodiment 3. FIG. (B) is a C arrow front view of (a). (C) is a schematic perspective view of the first top joint plate according to the third embodiment. FIG. 13 is a view for explaining a connecting structure of a steel support according to the third embodiment. (A) is a longitudinal cross-sectional view of the vicinity of the second top end joint plate of the right steel support according to the third embodiment. (B) is a D arrow front view of (a). (C) is a schematic perspective view of the second top end joint plate according to the third embodiment. FIG. 14 is a diagram for explaining the operation when connecting the left steel support and the right steel support in the third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
FIG. 1 is a side view of a tunnel support 10 according to the first embodiment. The tunnel support 10 is an arch-shaped steel support built along the pit wall immediately after excavation in order to prevent the collapse of exposed ground caused by tunnel excavation. Installed every time. The tunnel support 10 in this embodiment is formed of H-section steel having an H-shaped cross section. More specifically, the tunnel support 10 is formed in an arch shape by integrally connecting the top ends (upper ends) of the pair of arcuate steel supports 10L and 10R. Hereinafter, the steel support 10L is referred to as a “left steel support” and the steel support 10R is referred to as a “right steel support”.

  The left steel support 10 </ b> L includes a first main body 111, a first top joint plate 121, and a first bottom plate 131. The 1st main-body part 111 is the H-section steel comprised from the web 111a, a pair of ground mountain side flange 111b orthogonal to the said web 111a, and the inner space | flank side flange 111c. Further, a first top end joint plate 121 is welded to one end of the first main body 111, and a first bottom plate 131 is welded to the other end. The first top end joint plate 121 and the first bottom plate 131 are rectangular steel flat plates and extend in a direction orthogonal to the H-shaped cross section of the first main body 111. Similarly, the right steel support 10R includes the second main body 112, the second top joint plate 122, and the second bottom plate 132. The 2nd main-body part 112 is the H-section steel comprised from the web 112a, a pair of ground mountain side flange 112b orthogonal to the said web 112a, and the inner space side flange 112c. Further, the second top end joint plate 122 is welded to one end of the second main body portion 112, and the second bottom plate 132 is welded to the other end. The second top end joint plate 122 and the second bottom plate 132 are rectangular steel flat plates and extend in a direction orthogonal to the H-shaped cross section of the second main body 112. In the present embodiment, the first top joint plate 121 and the second top joint plate 122 have a congruent square plane.

  As shown in FIG. 1, the left steel support 10L and the right steel support 10R are connected in a state where the first top joint plate 121 and the second top joint plate 122 face each other. Hereinafter, the connection structure of the left steel support 10L and the right steel support 10R will be described.

  FIG. 2 is a schematic diagram illustrating a connection structure 30 that connects the left steel support 10L and the right steel support 10R according to the first embodiment. The connection structure 30 is a female connection that is recessed in the first top end joint plate 121 of the left steel support 10L, the second top end joint plate 122 of the right steel support 10R, and the first top end joint plate 121. Part 40, a male connecting part 50 and the like protruding from the second top joint plate 122. FIG. 2 shows a state before the first top joint plate 121 of the left steel support 10L and the second top joint plate 122 of the right steel support 10R are connected via the connection structure 30, that is, A state in which the first top end joint plate 121 and the second top end joint plate 122 are separated from each other is shown.

  Here, reference numeral 121a is the outer surface of the first top joint plate 121, and reference numeral 121b is the inner surface of the first top joint plate 12L. Reference numeral 122 a is an outer surface of the second top end joint plate 122, and reference numeral 122 b is an inner surface of the second top end joint plate 122. 3A shows the female connecting portion 40 viewed from the outer surface 121a side of the first top joint plate 121, and FIG. 3B shows the female connection portion 40 viewed from the inner surface 121b side of the first top joint plate 121. The female connection part 40 is shown. 4 (a) shows the male connecting portion 50 viewed from the inner surface 122b side of the second top end joint plate 122, and FIG. 4 (b) shows the second top end joint plate 122 viewed from the outer surface 122a side. A female connecting part 40 is shown.

  Reference numeral 121 c is the upper edge of the first top end joint plate 121, reference numeral 121 d is the lower edge of the first top end joint plate 121, and reference numeral 121 e is the left and right side edges of the first top end joint plate 121. Reference numeral 122c denotes an upper edge of the second top end joint plate 122, reference numeral 122d denotes a lower edge of the second top end joint plate 122, and reference numeral 122e denotes left and right side edges of the second top end joint plate 122. FIG. 3 illustrates the height direction and the width direction of the first top end joint plate 121, and FIG. 4 illustrates the height direction and the width direction of the second top end joint plate 122. The height direction of the first top end joint plate 121 is parallel to the extending direction of the side edge 121e, and is parallel to the extending direction of the web 111a at a position where the first main body 111 is connected to the first top end joint plate 121. It is. Further, the width direction of the first top end joint plate 121 is parallel to the extending direction of the upper edge 121 c and the lower edge 121 d, and the natural mountain side at the position where the first main body 111 is connected to the first top end joint plate 121. It is parallel to the extending direction of the flange 111b and the inner-side flange 111c. Further, the height direction of the second top end joint plate 122 is parallel to the extending direction of the side edge 122e, and the extending direction of the web 112a at a position where the second main body 112 is connected to the second top end joint plate 122. And parallel. The width direction of the second top end joint plate 122 is parallel to the extending direction of the upper edge 122c and the lower edge 122d, and the ground-side flange 112b at a position where the second main body 112 is connected to the second top end joint plate 122. And parallel to the extending direction of the inner-side flange 112c.

  As shown in FIGS. 3 (a) and 3 (b), the first top joint plate 121 has a female connecting portion 40 in each of a first area indicated by reference numeral A1 and a second area indicated by reference numeral A2. Is provided. The first area A1 is located on one side of the plane area of the first top end joint plate 121 with the web 111a of the first main body 111 as a boundary, and the natural ground side flange 111b, the inner air side flange 111c, and the web 111a. It is an area surrounded by. The second region A2 is located on the other side of the first top end joint plate 121 on the other side of the web 111a of the first main body 111, and the ground-side flange 111b, the inner-side flange 111c, and the web 111a. It is an area surrounded by. Similarly, as shown in FIGS. 4 (a) and 4 (b), the second top end joint plate 122 is connected to the first region indicated by reference numeral A1 and the second region indicated by reference numeral A2, respectively. A portion 40 is provided. The first region A1 is located on one side of the plane region of the second top end joint plate 122 with the web 112a of the second main body 112 as a boundary, and the natural ground side flange 112b, the inner air side flange 112c, and the web This is a region surrounded by 112a. The second region A2 is located on the other side of the plane region of the second top end joint plate 122 with the web 112a of the second main body 112 as a boundary, and the natural ground side flange 112b, the inner air side flange 112c, and the web This is a region surrounded by 112a.

  First, the male connection part 50 protruding from the second top end joint plate 122 will be described. The second top end joint plate 122 is formed with a pair of opening holes 122f at positions where the male connecting portions 50 are provided. The male connecting part 50 has a rod-shaped male locking member 51. The male locking member 51 is a shaft member having a slightly smaller diameter than the opening hole 122f of the second top end joint plate 122, and a male screw 51a is engraved at the base end portion thereof. In addition, an annular flange 51 b is provided in the middle portion of the male locking member 51. In addition, a male screw 51c is formed on the outer peripheral portion of the male locking member 51 at the front end side of the flange portion 51b. The male screw 51 c of the male locking member 51 is a circumferential male locking groove arranged in parallel on the outer periphery of the male locking member 51. Further, a tapered surface 51e having a diameter decreasing toward the tip is formed at the tip 51d of the male locking member 51.

  Further, a counterbore portion 122g that is recessed by one step from the periphery is formed around the opening hole 122f on the outer surface 122a side of the second top end joint plate 122. The flange 51 b of the male locking member 51 is larger than the diameter of the opening hole 122 f of the second top end joint plate 122. The base end of the female locking member 51 is inserted into the opening hole 122f from the outer surface 122a side of the second top end joint plate 122, and the base end male screw 51a is disposed in the counterbore portion 122g. A nut 52 is screwed onto the screw. As a result, the male locking member 51 can be fixed to the second top end joint plate 122 with the male locking member 51 protruding from the second top end joint plate 122.

  Next, the female connector 40 will be described. The first top joint plate 121 is provided with a pair of opening holes 121f at the position where the female connecting portion 40 is provided, and a metal cylindrical casing 41 is fixed to the inner surface 121b by welding wp or the like. Has been. The casing 41 has its axial center located substantially at the center of the opening hole 121f. A storage chamber 42 is formed in the casing 41. A tapered hole 43 having a tapered surface 43a whose inner diameter is gradually reduced from the rear end side to the front end side is formed in the front portion (front portion) of the storage chamber 42. In addition, a spring storage portion 42 a is formed in the intermediate portion of the storage chamber 42, and a female screw 45 is engraved on the inner periphery of the rear portion of the storage chamber 42. An insertion port 48 is formed at the tip of the tapered hole 43. The insertion port 48 located at the front end portion of the casing 41 has substantially the same diameter as the opening hole 121f formed in the first top end joint plate 121 and communicates with the opening hole 121f. Further, the insertion port 48 is disposed at a position where the casing 41 is fixed to the first top joint plate 121 and overlaps the opening hole 121f.

In the tapered hole 43, a divided female locking member 46 is slidably disposed in the axial direction. In the present embodiment, as shown in FIG. 5, a wedge-shaped female locking member 46 divided into three in the circumferential direction is disposed so as to be slidable in the axial (front-rear) direction of the casing 41. . Here, the outer surface of the female locking member 46 is formed as a tapered surface 46 a that can slide along the tapered surface 43 a in the tapered hole 43. The outer diameter of the tapered surface 46a of the female locking member 46 gradually increases from the tip side to the rear. Furthermore, a female screw 46 b is formed on the inner surface of each female locking member 46. The female screw 46b is a female locking groove in the circumferential direction provided in parallel on the inner surface of each female locking member 46. The female screw 46 b is an arc centered on the axis of the casing 41 and is engraved in a direction along the axis. As described above, a female screw hole is formed by the plurality of female locking members 46, and the taper surface 46 a of each female locking member 46 is retracted along the taper surface 43 a of the taper hole 43, so that the female screw The diameter of the female screw hole is reduced by expanding the diameter of the hole and moving it forward (forward). The female screw 46 b formed on the inner surface of each female locking member 46 can be engaged with a male screw 51 c formed on the outer peripheral portion on the distal end side of the male locking member 51.

  Further, in the spring storage portion 42 a of the storage chamber 42, a pressing spring 44, which is a pressing member that presses (elastically biases) the female locking member 46 forward (forward), is provided behind each female locking member 46. It is housed in a compressed state between a spring receiver 47 and a lid plate 49 provided at the end, and each female locking member 46 is always pushed forward by the pressing force of the pressing spring 44. The lid plate 49 can be held in a compressed state by being screwed onto a female screw 45 engraved on the rear inner peripheral side of the storage chamber 42. A hexagonal hole 49a is provided on the outer surface of the lid plate 49, and the lid plate 49 is detachable from the casing 41 with a hexagon wrench.

  In the female connecting part 40 and the male connecting part 50 configured as described above, the female screw 46b formed on the inner surface of each female locking member 46 and the outer peripheral part of the male locking member 51 are formed. The male screw 51c is formed so that the screw pitch is smaller than the pitch of fine screws defined in JIS. Further, in the female coupling portion 40 of the present embodiment, the helical female screw 46b is formed on the inner surface of each female locking member 46, but instead of the female screw 46b, the circumferential direction of each female locking member 46 Parallel grooves in which annular crests and annular troughs extending in parallel are arranged alternately and in parallel may be provided on the inner surface of each female locking member 46. Similarly, in the male connecting part 50, instead of the male screw 51c formed on the outer peripheral part of the male locking member 51, an annular peak and an annular valley extending in the circumferential direction of the male locking member 51 are provided. Parallel grooves arranged alternately and in parallel may be provided on the outer peripheral surface of the male locking member 51.

  Next, the operation of the connecting structure 30 when connecting the left steel support 10L and the right steel support 10R will be described. The left steel support 10L and the right steel support 10R can be connected and built using, for example, an erector apparatus 100 as shown in FIG. FIG. 6 is a top view of work vehicle 200 on which erector device 100 is mounted. The erector apparatus 100 includes a pair of booms 17L and 17R having the same configuration. The pair of booms 17L and 17R can be freely expanded / contracted, tilted, oscillated, and rotated by operation of a drive mechanism attached thereto. In addition, a pair of hands 18L and 18R having the same configuration are connected to the tips of the booms 17L and 17R. The pair of hands 18L and 18R can freely rotate and swing by the operation of a drive mechanism attached thereto, and the left steel support 10L and the right steel support 10R can be detachably clamped. (Hold). The erector apparatus 100 holds the left steel support 10L and the right steel support 10R with a pair of hands 18L and 18R, and drives the hands 18L and 18R to drive the left steel support 10L and the right steel support. The work 10R can be connected and can be built at a predetermined build position.

In the connecting method of the left steel support 10L and the right steel support 10R according to the present embodiment, the left steel support 10L and the right steel support 10R are held by the hands 18L and 18R of the erector apparatus 100, respectively. To do. And as FIG. 2 shows, the 1st top end joint board 121 in 10 L of left side steel support works, and the 2nd top end joint board 122 in 10 R of right side steel support works
The first top end joint plate so that the male connecting portion 50 (male locking member 51) is inserted into the opening hole 121f of the first top end joint plate 121 from the state where the two are close and opposed (opposed). The distance between 121 and the second top joint plate 122 is gradually reduced.

  Here, the outer diameter of the male locking member 51 is slightly smaller than the opening hole 121f of the first top end joint plate 121 and the insertion port 48 of the female coupling portion 40 (casing 41), and each female mold is formed. In a state where the locking member 46 is disposed at the most advanced position of the taper hole 43 (taper surface 43a), the diameter is set to be slightly larger than the diameter of the female screw hole formed by each female locking member 46. . When the male locking member 51 protruding from the second top end joint plate 122 enters from the insertion port 48 of the female connecting portion 40 through the opening hole 121f of the first top end joint plate 121, the pressing spring 44 is pushed. The head 51d of the male locking member 51 comes into contact with the front end surface 46c of each female locking member 46 positioned at the most advanced position of the tapered hole 43 (tapered surface 43a) at the front end by pressure. Then, the male locking member 51 resists the pressing force of the pressing spring 44, and each female locking member 46 is directed to the rear side in the axial direction of the female coupling portion 40 (casing 41) along the tapered surface 43 a. The male locking member 51 is inserted into the storage chamber 42 while expanding the diameter of the female screw hole formed by the female screw 46b of the tapered surface 46a of each female locking member 46.

  Then, the outer surface 121a of the first top end joint plate 121 and the outer surface 122a of the second top end joint plate 122 come into contact with each other to come into surface contact, and the male locking member into the storage chamber 42 in the female connecting portion 40 When the insertion of the male locking member 51 into the storage chamber 42 is stopped by completing the insertion of the 51, the female locking members 46 are moved forward (forward) by the pressing force of the pressing spring 44. ) And the female screw hole formed by the tapered surface 46a of each female locking member 46 is reduced in diameter. As a result, as shown in FIG. 7, the female screw 46 b (female side locking groove) of each female locking member 46 in the female connecting portion 40 and the male screw of the male locking member 51 in the male connecting portion 50. 51c (male side locking grooves) mesh with each other. As a result, as shown in FIG. 1, the left steel support 10L and the right steel support 10R are integrally connected with the first top joint plate 121 and the second top joint plate 122 in surface contact. Is done. In the present embodiment, each outer edge of the first top end joint plate 121 and the second top end joint plate 122 in a state where the male locking member 51 is inserted and locked to the female connecting portion 40. It is set so that the positions of each other match. That is, in the state where the female connecting portion 40 of the first top end joint plate 121 and the male locking member 51 of the second top end joint plate 122 are connected, the upper edge 121c of the first top end joint plate 121, the bottom The edge 121d and the pair of side edges 121e overlap the upper edge 122c, the lower edge 122d, and the pair of side edges 122e of the second top end joint plate 122, respectively.

  Here, as shown in FIG. 7, in the state where the female screw 46b of the female connecting portion 40 and the male screw 51c of the male connecting portion 50 (male locking member 51) are engaged with each other, the first top joint plate When an external force acts in a direction separating the 121 and the second top end joint plate 122, a pulling force acts in a direction of pulling out the male locking member 51 from the storage chamber 42 in the female connecting portion 40. This pull-out force is transmitted to each female locking member 46 through a male screw 51c and a female screw 46b that are engaged with each other. By the way, the outer diameter of the tapered surface 46a of each female locking member 46 gradually decreases from the rear side to the front side. Therefore, even if the pulling force acts on each female locking member 46, the displacement of each female locking member 46 toward the front of the tapered hole 43 is limited. That is, according to the connection structure 30 according to the present embodiment, even if an external force acts in the direction in which the male locking member 51 is pulled out from the storage chamber 42 of the female connection portion 40, the connection state is maintained against the external force. Can be maintained.

In addition, according to the connection structure 30 in the present embodiment, the operation of inserting the male connection portion 50 (male locking member 51) from the insertion port 48 of the female connection portion 40 is performed with respect to the female connection portion 40. Then, the male connecting part 50 is connected, and the left steel support 10L and the right steel support 10R can be integrally fastened. In other words, according to the steel support connection structure 30 in the present embodiment, as in the prior art, personnel are placed in the work scaffolds and the mancages of the erector apparatus assembled near the tunnel pit wall, and the vicinity of the top of the tunnel. It is not necessary to perform a connecting operation of moving personnel and bolting the joint plates located at the top ends of the pair of steel supporters. Therefore, according to the connection structure 30 of the steel support in this embodiment, it is possible to perform the connection work of the left steel support 10L and the right steel support 10R more easily and in a shorter time than conventional. it can. Moreover, according to the connection structure 30 of the steel support in this embodiment, the left steel support 10L and the right side are operated by operating the hands 18L and 18R attached to the tips of the pair of booms 17L and 17R in the erector apparatus 100. Since the steel support 10R can be connected, manual work at the face of the tunnel can be avoided, and safety and workability can be further improved as compared with the prior art.

  Moreover, in this embodiment, since the taper surface 51e which diameter-reduces toward the front-end | tip part is formed in the front-end | tip part 51d of the male type | mold locking member 51, 10L of left side steel supports, and 10R of right side steel supports Even when the insertion position 48 of the female connection part 40 and the center position of the male locking member 51 are relatively slightly displaced when connecting the female connection part 40 and the male connection part 50, the By sliding the taper surface 51e of the male locking member 51 along the edge of the opening hole 121f of the first top joint plate 121, the insertion port 48 and the male locking member 51 of the female connection portion 40 are slid. The male locking member 51 can be guided in a direction in which the amount of positional deviation between the centers decreases. That is, by providing the tapered surface 51e at the tip 51d of the male locking member 51, the left steel support 10L and the right steel support 10R (the female connection part 40 and the male connection part 50) are connected. In this case, the male locking member 51 can be smoothly guided to the insertion port 48 of the female connection part 40 even if the insertion position 48 of the female connection part 40 and the planar position of the male locking member 51 are slightly shifted. Can do. The details of the tapered surface 51e formed at the tip 51d of the male locking member 51 can be changed as appropriate. For example, the tip 51d of the male locking member 51 may be formed in a conical shape. In this case, the conical side surface is formed as a tapered surface 51e.

<Modification of Embodiment 1>
FIG. 8 is a diagram for explaining a modification of the first embodiment. The opening hole 121f formed in the first top end joint plate 121 according to this modification has a tapered surface 1215 whose diameter increases from the inner surface 121b to the outer surface 122a in the thickness direction of the first top end joint plate 121. Thus, when connecting the left steel support 10L and the right steel support 10R (the female connecting part 40 and the male connecting part 50) by forming the opening hole 121f of the top end joint plate 121. In addition, even if the insertion port 48 of the female connecting portion 40 and the center position of the male locking member 51 are slightly shifted relative to each other, the tapered surface 1215 in the opening hole 121f of the first top joint plate 121 is male. By sliding the locking member 51, the male locking member 51 can be guided in a direction in which the amount of displacement between the insertion port 48 and the center of the male locking member 51 in the female connecting portion 40 is reduced. it can. According to this, the male locking member 51 can be smoothly guided to the insertion port 48 of the female connecting portion 40.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described. FIG. 9 is a view for explaining a connecting structure of steel supporters according to the second embodiment. FIG. 9 shows the first top end joint plate 121 and its peripheral structure of the left steel support 10L provided with the female connecting portion 40 out of the left steel support 10L and the right steel support 10R. Yes. Fig.9 (a) is a longitudinal cross-sectional view of the 1st top end joint board 121 vicinity in 10 L of steel support works on the left side. FIG. 9B is a front view as seen from the arrow A in FIG. FIG.9 (c) is BB arrow sectional drawing of Fig.9 (a). Although not shown in FIG. 9, the right steel support structure 10 </ b> R in the present embodiment has the same structure as that of the first embodiment. The embodiment also includes the female connecting portion 40 recessed in the first top joint plate 121 and the male connecting portion 50 (male locking member 51) projecting from the second top joint plate 122. 1 is the same structure.

As shown in FIGS. 9A to 9C, a guide member 70 is provided on the outer peripheral edge of the first top joint plate 121 according to the second embodiment. The guide member 70 has a substantially trumpet shape as a whole, and is provided so as to cover the outer peripheral edge of the first top end joint plate 121. The guide member 70 has an upper guide wall 71, a lower guide wall 72, and a pair of side guide walls 73 each formed of a flat steel plate. As illustrated, the upper guide wall 71 extends from the upper edge 121 c of the first top end joint plate 121 in the vertical direction with respect to the first top end joint plate 121. On the other hand, the lower guide wall 72 extends obliquely from the lower edge 121d of the first top joint plate 121 with respect to the first top joint plate 121, and the pair of side guide walls 73 serve as the first top joint plate. The side edge 121e of 121 extends in an oblique direction with respect to the first top joint plate 121.

  Next, the operation | movement at the time of connecting the left steel support 10L and the right steel support 10R in Embodiment 2 is demonstrated. FIG. 10 is a diagram illustrating an operation when the left steel support 10L and the right steel support 10R are connected in the second embodiment. In the present embodiment, the guide member 70 guides the second top joint plate 122 when connecting the left steel support 10L and the right steel support 10R (the female connecting part 40 and the male connecting part 50). Then, the male locking member 51 of the male connecting portion 50 is guided to the insertion port 48 of the female connecting portion 40. The connection structure 30 in the present embodiment is recessed in the first top joint plate 121 of the left steel support 10L, the second top joint plate 122, and the first top joint plate 121 of the right steel support 10R. The female connection part 40, the male connection part 50 protruding from the second top joint plate 122, and the guide member 70 are included.

  In the example shown in FIG. 10, the lower edge 122 d of the second top end joint plate 122 of the right steel support 10 </ b> R abuts on the lower guide wall 72 of the guide member 70 and slides on the surface of the lower guide wall 72. Accordingly, the amount of shift in the height direction between the insertion port 48 (the opening hole 121f of the first top end joint plate 121) in the female connecting portion 40 and the center of the male locking member 51 in the male connecting portion 50 gradually increases. Decrease. Further, in the present embodiment, the insertion port 48 and the male locking member in the female coupling portion 40 in a state where the upper edge 122c of the second top end joint plate 122 is in contact with the upper guide wall 71 of the guide member 70. The amount of deviation in the height direction between the centers of 51 is set to be zero. Although not shown in FIG. 10, the second top end joint plate 122 of the right steel support 10 </ b> R in the process of relatively approaching the left steel support 10 </ b> L and the right steel support 10 </ b> R. By sliding the side edge 122e along the surface of the side guide wall 73 of the guide member 70, the insertion port 48 (the opening hole 121f of the first top end joint plate 121) and the male connection are formed in the female connection portion 40. The amount of shift in the width direction between the centers of the male locking members 51 in the portion 50 gradually decreases.

  As described above, in the guide member 70 according to the present embodiment, the effective area surrounded by the guide member 70 gradually increases from the distal end side to the proximal end side (the connection end with the first top end joint plate 121) of the guide member 70. It is squeezed. Therefore, when the left steel support 10L and the right steel support 10R are connected, the first top joint plate 121 and the second top joint plate 122 are gradually brought closer to each other, so that the outside of the first top joint plate 121 is removed. A guide member 70 provided at the periphery guides the second top end joint plate 122. Thereby, the centers of the insertion port 48 and the male locking member 51 in the female connecting part 40 are aligned. That is, the male locking member 51 can be guided to the insertion port 48 (the opening hole 121f of the first top end joint plate 121) of the female connecting part 40. Then, by inserting the male locking member 51 from the insertion port 48 of the female connecting part 40, the connection of the left steel support 10L and the right steel support 10R is completed.

In the guide member 70 according to the present embodiment, the upper guide wall 71 extends in the vertical direction from the upper edge 121 c of the first top end joint plate 121 to the first top end joint plate 121. As a result, the upper guide wall 71 of the guide member 70 does not protrude greatly outward from the upper edge 121c of the first top end joint plate 121. This makes it difficult for the upper guide wall 71 of the guide member 70 to interfere (collision) with the top end of the tunnel pit wall during the connecting operation of the left steel support 10L and the right steel support 10R. Can do. However, the guide member 70 is not particularly limited to the above shape, and the male locking member 51 is located at the position of the insertion port 48 in the female connecting portion 40 when the left steel support 10L and the right steel support 10R are connected. If it can guide so that it may approach, various shapes are employable. For example, the guide member 70 described above has a trumpet shape and has a shape that spreads from the base end side to the tip end side, but is not limited thereto. Further, the guide member 70 may be provided on a part of the outer peripheral edge of the first top end joint plate 121.

<Modification of Embodiment 2>
Here, FIG. 11A and FIG. 11B are diagrams illustrating a guide member according to a modification of the second embodiment. The guide member 70A shown in FIG. 11A includes an upper guide wall 71A projecting vertically from the four sides (four surfaces) of the outer peripheral edge of the first top end joint plate 121 to the first top end joint plate 121, and a lower guide. It has a wall 72A and a pair of side guide walls 73A. Here, the upper guide wall 71A of the guide member 70A is erected at the center of the upper edge 121c of the first top end joint plate 121, and the lower guide wall 72A is the center of the lower edge 121d of the first top end joint plate 121. The pair of side guide walls 73 </ b> A are erected at the center of each side edge 121 e of the first top end joint plate 121. In the example shown in FIG. 11A, the width dimensions of the upper guide wall 71A, the lower guide wall 72A, and the side guide wall 73A are respectively the upper edge 121c, the lower edge 121d, and the side edge 121e of the first top end joint plate 121. It is set smaller than the length of the side, and a gap G is formed between the upper guide wall 71A and the side guide wall 73A and between the lower guide wall 72A and the side guide wall 73A of the guide member 70A. Is formed.

  As described above, the guide member 70 </ b> A illustrated in FIG. 11A does not cover the entire outer periphery of the first top end joint plate 121 but covers only a part of the outer periphery of the first top end joint plate 121. According to this, at the time of connecting the left steel support 10L and the right steel support 10R, the operator of the erector apparatus 100 looks at the female connecting part 40 recessed in the first top joint plate 121. easy.

  In addition, in the guide member 70A shown in FIG. 11A, the protrusion of the guide member 70A (the height of the upper guide wall 71A, the lower guide wall 72A, and the pair of side guide walls 73A) with respect to the outer surface 121a of the first top end joint plate 121. The dimension is set to be larger than the protruding length of the male locking member 51 protruding from the outer surface 122 a of the second top end joint plate 122. Accordingly, when the left steel support 10L and the right steel support 10R are connected, the second top end joint plate 122 is preferably guided by the guide member 70A, and the male connection portion 40 is positioned at the position of the insertion port 48. The mold locking member 51 can be smoothly guided. For example, the protruding dimension of the guide member 70 </ b> A with respect to the outer surface 121 a of the first top end joint plate 121 is about 20 to 30 mm larger than the protruding length of the male locking member 51 with respect to the outer surface 122 a of the second top end joint plate 122. You may set to a dimension.

  Next, the guide member 70B shown in FIG. 11B will be described. The guide member 70 </ b> B has guide walls provided on two sides (two surfaces) forming corners on the outer peripheral edge of the first top end joint plate 121. Specifically, the guide member 70 </ b> B is an upright guide wall 71 </ b> B standing from the upper edge 121 c of the first top end joint plate 121 and one side edge 121 e of the first top end joint plate 121. A side guide wall 73B is provided. Here, as shown in FIG. 11B, the width dimension of the upper guide wall 71A is smaller than the length of the upper edge 121c in the first top end joint plate 121 provided with the upper guide wall 71A. Moreover, the width dimension of the side guide wall 73B is smaller than the length of the side edge 121e in the 1st top end joint board 121 in which the said side guide wall 73B is provided.

Since the guide member 70B shown in FIG. 11B is composed of an upper guide wall 71B and a side guide wall 73B projecting from two sides forming the corner portion of the outer peripheral edge of the first top joint plate 121, The gap G formed between the upper guide wall 71B and the side guide wall 73B can be further ensured. Therefore, the visibility of the female connection part 40 at the time of connection of the left steel support 10L and the right steel support 10R can be further enhanced. Further, since the corners are formed by the upper guide wall 71B and the side guide wall 73B orthogonal to each other, the upper portion of the second top end joint plate 122 is connected when the left steel support 10L and the right steel support 10R are connected. The second top joint plate 122 can be guided to an appropriate position by making the corner portion formed by the edge 122c and the side edge 122e abut against the above-mentioned corner portion. As a result, the male locking member 51 can be suitably guided to the insertion port 48 of the female connecting part 40, and the left steel support 10L and the right steel support 10R can be connected smoothly.

  In addition, the side guide wall 73B in the guide member 70B shown in FIG. 11B faces the face (that is, faces the erector device 100) when the left steel support 10L and the right steel support 10R are connected. It is installed on the side edge 121e. According to the guide member 70B in the present embodiment, the lower edge 121d of the first top joint plate 121 and the side edge 121e that does not face the face (that is, the side that faces the erector device 100) are provided on the guide wall. Since the left steel support 10L and the right steel support 10R are connected, the operator of the erector apparatus 100 uses the female connecting part 40 of the first top joint plate 121 more than the left steel support 10L and the right steel support 10R. It becomes easier to see.

<Embodiment 3>
Next, a third embodiment of the present invention will be described. FIG.12 and FIG.13 is a figure explaining the connection structure of the steel support construction which concerns on Embodiment 3. FIG. FIG. 12 shows a peripheral structure of the first top end joint plate 121 of the left steel support 10L in the third embodiment. FIG. 13 shows a peripheral structure of the second top joint plate 122 of the right steel support 10R according to the third embodiment.

  FIG. 12A is a longitudinal sectional view of the vicinity of the first top end joint plate 121 in the left steel support 10L according to the third embodiment. FIG.12 (b) is a C arrow front view of Fig.12 (a). FIG. 12C is a schematic perspective view of the first top joint plate 121 according to the third embodiment. FIG. 13A is a longitudinal sectional view in the vicinity of the second top joint plate 122 of the right steel support 10R according to the third embodiment. FIG.13 (b) is a front view seen from the arrow D of Fig.13 (a). FIG. 13C is a schematic perspective view of the second top joint plate 122 according to the third embodiment. In addition, in FIG.12 (c), illustration of the 1st main-body part 111 in the left side steel support 10L is abbreviate | omitted. Moreover, in FIG.13 (c), illustration of the 2nd main-body part 112 in the right side steel support 10R is abbreviate | omitted.

  The first top joint plate 121 of the left steel support 10L in Embodiment 3 has a concave shape S1. Further, the second top end joint plate 122 of the right steel support 10R according to the third embodiment has a convex shape S2 complementary to the concave shape S1, and the left steel support 10L and the right steel support. The first top end joint plate 121 and the second top end joint plate 122 are configured to be in surface contact with each other when the work 10R is connected.

  More specifically, the first top joint plate 121 has a folded plate structure that is folded into a substantially V shape (valley shape) so that the outer surface 121a side is a concave surface (concave surface shape S1). The outer surface 121 a of the first top joint plate 121 includes a flat concave bottom surface portion 1210, and an upper slope portion 1211 and a lower slope portion 1212 formed on both sides of the concave bottom surface portion 1210. With the flat concave bottom surface portion 1210 as a reference, the inclination angles of the upper slope portion 1211 and the lower slope portion 1212 with respect to the concave bottom surface portion 1210 are equal. On the other hand, the second top joint plate 122 has a folded plate structure that is folded into a substantially V shape (mountain shape) so that the outer surface 122a side becomes a convex surface (convex surface shape S2). The outer surface 122a of the second top end joint plate 122 includes a flat convex top surface portion 1220, and an upper slope portion 1221 and a lower slope portion 1222 formed on both sides of the convex top surface portion 1220.

Here, the pair of female connecting portions 40 provided on the first top joint plate 121 are arranged on the concave bottom surface portion 1210. Here, the concave bottom surface portion 1210 is a relatively concave region in the first top joint plate 121 having the concave shape S1. The pair of male connecting portions 50 (male locking members 51) provided on the second top end joint plate 122 are arranged on the convex top surface portion 1220. Here, the convex top surface portion 1220 is a relatively raised region in the second top end joint plate 122 having the convex shape S2. Further, the female connecting part 40 and the male connecting part 50 are the same as those in the first and second embodiments. In the present embodiment, when the male locking member 51 is inserted and locked with respect to the female connecting portion 40, the outer edges of the first top end joint plate 121 and the second top end joint plate 122 All the positions are matched, and the outer surface 121a of the first top joint plate 121 and the outer surface 122a of the second top joint plate 122 are in surface contact. More specifically, the concave bottom surface portion 1210, the upper slope portion 1211, and the lower slope portion 1212 of the first top end joint plate 121 are respectively the convex top surface portion 1220, the upper slope portion 1221, and the lower slope portion of the second top end joint plate 122. It is adjusted so as to make surface contact with 1222 without causing a gap.

  FIG. 14 is a diagram illustrating an operation when connecting the left steel support 10L and the right steel support 10R in the third embodiment. As shown in the drawing, in the connecting structure of the steel support in this embodiment, when connecting the left steel support 10L and the right steel support 10R, along the concave surface of the first top joint plate 121. The male locking member 51 of the male connecting portion 50 slides. In the example shown in FIG. 14, the male engaging member 51 of the male connecting part 50 is guided by sliding along the surface of the upper slope part 1211 in the right steel support 10R, and the female connecting part 40 The male locking member 51 is guided in a direction in which the centers of the insertion port 48 and the male locking member 51 coincide. Thus, the male locking member 51 can be smoothly inserted into the storage chamber 42 from the insertion port 48 in the female coupling part 40, and the male locking member 51 is engaged with the female coupling part 40. can do.

  In the present embodiment, the female connecting portion 40 is disposed on the concave bottom surface portion 1210 which is the most concave region of the first top end joint plate 121 having the concave shape S1, and the second shape having the convex shape S2. In the second top end joint plate 122 having the convex shape S2 which is the most raised region of the top end joint plate 122, the male connecting portion 50 (male type) is connected to the convex top surface portion 1220 which is the relatively highest raised region. The locking member 51) is arranged. According to this, when the male locking member 51 is guided along the concave surface of the first top joint plate 121, the male locking member is smoother with respect to the insertion port 48 of the female coupling portion 40. 51 can be derived. In the example shown in FIG. 14, an example in which the upper slope portion 1211 of the first top end joint plate 121 functions as a guide surface of the male locking member 51 is shown. The lower inclined surface portion 1212 may function as a guide surface of the male locking member 51 by sliding the male locking member 51 along the portion 1212. In addition, the structure of the female type | mold connection part 40 in this embodiment and the male type | mold connection part 50 is the same as that of the above-mentioned embodiment.

  Further, as shown in FIG. 14, in a state where the male locking member 51 is fastened to the female connecting portion 40, the outer surface 121 a of the first top end joint plate 121 and the outer surface 122 a of the second top end joint plate 122 are Surface contact. That is, the concave bottom surface portion 1210, the upper inclined surface portion 1211 and the lower inclined surface portion 1212 of the first top end joint plate 121 are respectively connected to the convex top surface portion 1220, the upper inclined surface portion 1221 and the lower inclined surface portion 1222 of the second top end joint plate 122. Because of the surface contact, the stress transmission between the first top end joint plate 121 and the second top end joint plate 122 can be reliably performed. In the example shown in FIGS. 12 to 14, the case where the concave surface shape S1 of the first top end joint plate 121 and the convex shape S2 of the second top end joint plate 122 are made into a substantially V-shaped complementary relationship has been described. However, various combinations can be adopted for the concave shape S1 and the convex shape S2.

  As mentioned above, although embodiment and the modification of this invention were described, the connection structure of the steel supporter which concerns on this invention is not restricted to these, These can be combined as much as possible.

DESCRIPTION OF SYMBOLS 10 ... Tunnel support 10L ... Left steel support 10R ... Right steel support 40 ... Female type | mold connection part 41 ... Casing 42 ... Storage chamber 46 ... Female type Locking member 48... Insertion port 50... Male connecting portion 51... Male locking member 111... First body portion 112. Joint plate 122 ... second top end joint plate

Claims (10)

A connection structure for connecting a pair of steel supporters divided into arcs built along the tunnel pit wall to each other at their top ends,
A first top end joint plate and a second top end joint plate, which are respectively provided at the top end portions of the pair of steel support members and are brought into contact with each other when the pair of steel support members are connected;
A female connecting portion recessed in the first top end joint plate;
A male connecting portion projecting from the second top end joint plate;
With
The male connecting portion has a rod-shaped male locking member protruding from the second top joint plate,
The female connecting portion has an opening hole formed through the first top joint plate, and a storage chamber in which an insertion port communicating with the opening hole and allowing insertion of the male locking member is formed. includes a casing having therein to lock the male locking member inserted into the storage chamber from the insertion opening,
When the pair of steel support members are connected to the outer peripheral edge of the first top end joint plate, the second top end joint plate is guided and the male die is inserted into the insertion opening of the female die connecting portion. A guide member for guiding the locking member is provided,
The guide member is provided only on two sides forming a corner at an outer peripheral edge of the first top joint plate, and an upper guide wall provided on an upper edge of the first top joint plate; Of the first top joint plate, it has a side guide wall provided on the side edge facing the face when connecting the pair of steel support works,
Steel support construction connection structure. The connecting structure for a steel support according to claim 1, wherein a width dimension of the upper guide wall is smaller than a length of the upper edge of the first top end joint plate. The connection structure of the steel support structure of Claim 1 or 2 whose width dimension of the said side guide wall is smaller than the length of the said side edge of the said 1st top end joint board. A connection structure for connecting a pair of steel supporters divided into arcs built along the tunnel pit wall to each other at their top ends,
A first top end joint plate and a second top end joint plate, which are respectively provided at the top end portions of the pair of steel support members and are brought into contact with each other when the pair of steel support members are connected;
A female connecting portion recessed in the first top end joint plate;
A male connecting portion projecting from the second top end joint plate;
With
The male connecting portion has a rod-shaped male locking member protruding from the second top joint plate,
The female connecting portion has an opening hole formed through the first top joint plate, and a storage chamber in which an insertion port communicating with the opening hole and allowing insertion of the male locking member is formed. includes a casing having therein to lock the male locking member inserted into the storage chamber from the insertion opening,
The first top end joint plate has a concave shape, and the second top end joint plate has a convex shape complementary to the concave shape of the first top end joint plate. When the pair of steel support members are connected, the first top end joint plate and the second top end joint plate are formed in surface contact with each other,
When the pair of steel support members are coupled, the male locking member slides along the concave surface of the first top joint plate, so that the concave surface causes the male locking member to move to the female. Functions as a guide for guiding to the insertion port of the mold connecting portion,
Steel support construction connection structure. The female connecting portion is disposed in the most recessed region in the region of the first top joint plate having the concave shape,
The male locking member is disposed in the most raised region in the region of the second top joint plate having the convex shape.
The steel support structure connection structure according to claim 4 . The female connecting portion is formed in the storage chamber and has a tapered hole having a diameter reduced toward the insertion port, and is divided into a plurality of portions in the circumferential direction in the tapered hole and is formed on the tapered surface. along with the female engaging member slidably disposed wedge by a plurality juxtaposed circumferential direction of the female side locking groove on the inner surface of the female locking member, said female engagement member and the A pressing member that presses toward the insertion port side ,
The male connector further includes a plurality of circumferential male locking grooves arranged in parallel on the outer periphery of the male locking member,
When the male locking member is inserted from the insertion port of the female connecting portion, the male locking member resists the pressing force of the pressing member and causes the female locking member to taper. The male locking member is inserted into the storage chamber while expanding the inner surface of the female locking member by retreating along the surface,
When the insertion of the male locking member into the storage chamber is completed, the female locking member is pushed back toward the insertion port along the tapered surface by the pressing force of the pressing member. The inner surface of the female locking member is reduced in diameter, and the female locking groove and the male locking groove are engaged with each other, so that the male connection portion and the female connection portion are integrally connected. To be
The connection structure of the steel supporter as described in any one of Claims 1-5 . The opening hole has a tapered surface that expands from the inner surface side to the outer surface side in the thickness direction of the first top joint plate.
The connection structure of the steel support works as described in any one of Claim 1 to 6 . The connecting structure for a steel support according to any one of claims 1 to 7 , wherein a tapered surface having a diameter decreasing toward the tip is formed at a tip of the male locking member. A steel support construction for connecting the top ends of a pair of steel support constructions divided into arcs using the steel support construction structure according to any one of claims 1 to 8. Consolidation method. The pair of steel supporters connected to each other by the connecting method of the steel supporter according to claim 9 are installed at a predetermined installation position.
How to build a steel support.

Images