JP6629822B2 - Support for laying box connection - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a laying box connection support for preventing a joint of a concrete box used for constructing an underground structure such as water supply and sewerage and an underpass in an urban area.

  A concrete box (box culvert) is a box-shaped structure buried underground, and is used for various purposes such as housing roads, waterways, communication lines, and the like.

  Conventionally, concrete boxes (box culverts) are installed one by one from the ground to the installation part formed by excavating from the ground, which is generally used for the so-called open-cutting method. Also used in construction methods.

  FIG. 8 shows an example of such a concrete box. The concrete box 4 is made of reinforced concrete or PC concrete. The surface is open as an opening.

  Further, the concrete box 4 is provided with an insert (sheath hole / bolt insertion hole) 12 for joining to each other.

  The end of the insert (bolt insertion hole) 12 is formed as a sheath hole (not shown), and there is a box hole for forming a fixing portion at the end.

  In order to form such a concrete box 4 with a flexible connection structure, the connection of each concrete box 4 is performed by a flexible joint fitting or the like. The transmission of the propulsive force to each concrete box 4 may be hindered by the flexible connection, and the flexible connection may cause torsion or displacement in the vertical and horizontal directions. it is conceivable that.

  Therefore, in each concrete box 4 employing the above-described conventional flexible connection structure, the transmission of propulsion force cannot be reliably performed at each connection portion, and the rows are deformed and meander. Since reliable propulsion could not be performed, it was difficult to adopt a propulsion method when installing it.

The following patent document discloses that the meandering prevention metal fittings 66 are laid over both inner surfaces, thereby torsion and vertical and horizontal directions generated at flexible connecting portions between the concrete boxes 4 during propulsion construction. Displacement is prevented.
JP-A-9-170257

  As shown in FIGS. 9 and 10, the meandering prevention fitting 66 includes a fixing plate 66a attached to the inner surface 4e of each of the concrete boxes 4, and a connecting plate 66b connecting the fixing plates 66a. Consists of

  As shown in FIG. 9, a total of four fixing plates 66a are arranged in a substantially X-shape with the connecting plate 66b as the center. The meandering prevention metal fitting 66 is to be removed after completion of the propulsion construction.

  The meandering prevention fitting 66 of Patent Document 1 can only fix the inner surface 4e of the concrete box 4 on the left and right, and cannot be said to be an effective fixation for the displacement of the concrete box 4 in the front, rear, left and right directions. .

  Furthermore, since they are fixed by the plate, even if they are attached with bolts or the like, the plate itself may be bent or the concrete box 4 may be cracked.

  Although it is not conceivable to use a method of fixing the support 16 and the backing plate as shown in FIG. 11, a plurality of supports 16 are required to fix the inner surface 4e of the concrete box 4 in four directions, up, down, left and right. Will be combined back and forth so as to cross each other, the bearing cores will be different, and it is difficult to uniformly fix the joints between the concrete boxes 4.

  The support 16 includes a lower pillar 17 having a base plate 18 at a lower end, and an upper pillar 19 having a receiving plate 20 at an upper end. A female screw 21 is provided on a lower thread portion of the upper pillar 19 inserted into the lower pillar 17. The female thread 21 adjusts the length of the upper pillar 19 to be inserted into the lower pillar 17 by using the female screw 21 so that the entire body is formed as a tension rod, and the pin 23 is inserted into the lock bolt 22 and fixed.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a support for connecting a laying box which can solve the disadvantages of the conventional example described above, and can easily and quickly and surely prevent displacement between the boxes when the box is installed.

  In order to achieve the above object, the present invention according to claim 1, wherein the whole is on the same plane, a support plate having a support plate with a support plate having a support portion having a root portion screwed at a tip thereof, and a screw vertically and horizontally. The gist is that it consists of a combination with a support connecting part with a fitting cylinder protruding, and that the support strut is fitted to the screw fitting cylinder of the support connecting part and the supporting plate contacts the box joint from the inside. Is what you do.

  According to the first aspect of the present invention, the displacement between the box and the box can be prevented by abutting the supporting plate against the box joint from the inside.

  And since a supporting plate is arrange | positioned at the upper, lower, left and right four directions of the inner surface of a concrete box, and it is flush, it can suppress a box joint part uniformly in the circumferential direction.

  According to a second aspect of the present invention, a support plate having a support plate having a screw insertion portion at the tip and a screw fitting cylindrical body projecting up, down, left and right is provided. It consists of a combination of a support connecting portion provided and a connecting post having screw insertion portions at both ends. Four of the support connecting portions are framed in a square with the connecting post, and the remaining screw fitting of the support connecting portion is performed. The gist of the present invention is to fit a support column into a cylindrical body and abut the support plate against the box joint from inside.

  According to the second aspect of the present invention, in addition to the operation of the first aspect, the central portion has a rigid structure framed in a square, from which the support posts project outward to the same plane. By adjusting the screw fitting of the support column, the supporting plate presses the inside of the box joint.

  The gist of the present invention described in claim 3 is that the side, the top, and the bottom inside the box are equally supported on the line of the joint part of the box joint.

  According to the third aspect of the present invention, the side portion, the upper portion, and the bottom portion of the inside of the box are supported in the same manner, so that the displacement between the box and the box can be reliably prevented.

  The gist of the present invention described in claim 4 is that the haunch portion on the inner side of the box is supported identically on the line of the joint portion of the box joint.

  According to the fourth aspect of the present invention, by using the haunch portion inside the box and supporting the same, the displacement between the box and the box can be reliably prevented.

  According to a fifth aspect of the present invention, in the box, a propulsion jack is disposed inside the left and right side wall plates, and excavates and removes earth and sand in front of the front or upper surface opening of the open shield machine having the front, rear and upper surfaces opened. And the step of extending the propulsion jack and advancing the shield machine with the concrete box consisting of the left and right side plates, the upper floor board and the lower floor board as a reaction force, and behind the propulsion jack shrunk in the tail part of the shield machine The installation process of suspending a new concrete box from above and joining it to the existing concrete box is repeated as appropriate, and the concrete is to be used for the open shield method of burying concrete boxes in tandem in sequence. It is.

  According to the fifth aspect of the present invention, in the open shield method, concrete boxes are sequentially buried in tandem. However, unlike the propulsion method, the box does not move forward, but receives the jack thrust of the open shield machine. Even if the body is likely to be misaligned in the vertical and horizontal directions, the fixing of the support pressure plate of the support can sufficiently prevent the misalignment.

  It is not necessary to fix the boxes back and forth with a fixing plate as in Patent Document 1.

  As described above, the laying box connecting support can easily, quickly, and surely prevent displacement between the box and the box when the box is installed.

It is a front view showing a 1st embodiment of a laying box connection support of the present invention. It is a front view which shows the detail of the A section of FIG. It is an enlarged front view of a support connection part. It is a front view showing a 2nd embodiment of a laying box connection support of the present invention. It is a front view showing a 3rd embodiment of a laying box connection support of the present invention. It is explanatory drawing at the time of box installation of an open shield method. It is explanatory drawing at the time of box connection of the open shield method. It is a perspective view of a concrete box. It is a side view which shows a prior art example. It is a front view which shows a prior art example. It is a front view which shows the general example of a support.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a first embodiment of a laying box connection support of the present invention. In the figure, reference numeral 4 denotes a concrete box, which is a left side plate 4a and a right side plate 4b, as shown in FIG. It consists of a floor plate 4c and a lower floor plate 4d, and its front and rear surfaces are open as openings.

  The present invention uses a support 34 to fix the concrete boxes 4 to be connected.

  The support 34 includes a support post 25, a support connecting portion 30 for connecting the support post 25, and a connecting post 31 for connecting the support connecting portions 30 to each other.

  The support column 25 has a support plate 26 axially attached to a tip thereof with a spherical hinge 27, and a root portion as a screw insertion portion (male screw) 28.

  The support column 25 has a handle 35 for rotation.

  The support connecting portion 30 has a screw fitting cylindrical body (female screw) 29 protruding in the up, down, left, and right cross directions.

  The connecting column 31 has a screw insertion portion (male screw) 32 at both ends, and a bolt connection 36 by a flange in the middle.

  The screw insertion part (male screw) 32 of the connecting post 31 is screwed into the screw fitting cylinder (female screw) 29 of the support connecting part 30, and four of the support connecting parts 30 are squared by the connecting post 31. , A framework 33 is formed. (See Fig. 3)

  The support column 25 is fitted to the remaining screw fitting cylindrical body 29 of the support connection portion 30 with respect to the frame 33, and the supporting plate 26 abuts on the mutual joint portion of the concrete box 4 from the inside. (See Fig. 2)

  The pressing of the support plate 26 can be performed by adjusting the length of the support column 25 with the handle 35. In the drawing, reference numeral 37 denotes a joint of the mutual joining portion of the box 4.

  FIG. 4 shows a second embodiment of the present invention, which is used when the concrete box 4 has a relatively small diameter.

  The support column 25 of the first embodiment is omitted, and the whole is on the same plane. A support plate 26 is axially mounted on the tip, and a root portion has a screw insertion portion (male screw) 28. The support column 30 is formed by a combination of a support 30 and a support connecting portion 30 in which a screw fitting cylindrical body 29 is protruded vertically and horizontally. Abut against the box joint from inside.

  In the present embodiment, the support plate 26 supports the inner side, the upper part, and the lower part of the box 4 equally on the line of the joint part of the box joint.

  FIG. 5 shows a third embodiment of the present invention, which is used when the concrete box 4 has a relatively small diameter as in the second embodiment.

  While the second embodiment supports the inner side, the upper part, and the lower part of the box 4 in the same manner, the inner haunch 4f of the box 4 supports the same.

Next, an open shield method using the support of the present invention will be described.
As shown in FIGS. 6 and 7, the open shield machine 1 is installed in the start shaft, the propulsion jack 3 of the open shield machine 1 is extended, and a reaction force is applied to the reaction wall in the start shaft to open shield. The machine 1 is moved forward, and the first concrete box 4 forming the underground structure is suspended from above by a lifting machine 14 such as a crane, and the propulsion jack 3 contracted in the tail part 1b of the open shield machine 1 Set backward.

  An excavator 7 such as a shovel excavates earth and sand from the front or upper surface of the open shield machine 1 and discharges the earth. Simultaneously with or after this earth removal step, the propulsion jack 3 is extended to move the open shield machine 1 forward.

  Then, the second concrete box 4 is suspended in the tail portion 1b of the open shield machine 1 before the first concrete box 4. Hereinafter, the same soil removal process, advancement process, and setting process of the concrete box 4 are appropriately repeated, and the concrete box 4 is sequentially left in the ground as the open shield machine 1 advances, and the concrete box 4 is further removed. 4 is back-filled on the upper surface.

  When the concrete box 4 is connected, it is fixed by the support 34, and is removed when it is no longer necessary.

  In this way, when the open shield machine 1 reaches the reaching pit, it is removed and the construction is completed.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Front part 1b ... Tail part 2 ... Middle bent part 3 ... Propulsion jack (shield jack)
4 Concrete box 4a Left side plate 4b Right side plate 4c Upper floor plate 4d Lower floor plate 4e Inner surface 4f Haunch part 5 Bottom plate 6 Slide retaining plate 7 Excavator 8 Press bar (push angle)
9 back filling material 10 fixing unit 11 cushion material 12 insert (bolt insertion hole)
DESCRIPTION OF SYMBOLS 13 ... Sealing material 14 ... Lifting machine 15 ... Guide pin insertion hole 16 ... Support 17 ... Lower pillar 18 ... Base plate 19 ... Upper pillar 20 ... Receiving plate 21 ... Female thread 22 ... Retaining bolt 23 ... Pin 25 ... Support pillar 26 ... Support plate 27: spherical hinge 28: screw insertion part (male screw)
29: screw fitting cylinder (female thread) 30: support connection part 31: connection support 32: screw insertion part (male screw)
33 ... frame 34 ... support 35 ... handle 36 ... bolt joint 37 ... joint 66 ... meandering prevention fitting 66a ... fixing plate 66b ... connecting plate

Claims (5)

  The whole is on the same plane, from the combination of a support post with a support plate attached at the tip and a screw insertion part at the root, and a support connection part with screw fitting cylinders protruding up, down, left and right A support for connecting a laying box, wherein the support strut is fitted to the screw fitting cylinder of the support connecting part and the supporting plate abuts on the box joint from inside.   The whole is on the same plane, with a support plate with a support plate attached at the tip and a screw insertion part at the root, a support connection part with a screw fitting cylinder projecting up, down, left and right, and both ends , And four support connection parts are framed in a square with connection connection pillars, and the support pillars are fitted into the remaining screw fitting cylinders of the support connection parts. The support for connecting the laying box, characterized in that the supporting plate comes into contact with the box joint from inside.   The support for connecting a laying box according to claim 1 or 2, wherein the side, the top, and the bottom inside the box are equally supported on the joint line of the box joint.   The support for connecting a laying box according to claim 1 or 2, wherein the haunch portion inside the box is supported equally on the line of the joint portion of the box joint.   The box is equipped with propulsion jacks inside the left and right side wall plates, excavating and discharging earth and sand in front of the front or top opening of the open shield machine with front, rear and top openings, and extending the propulsion jack. The process of advancing the shield machine with a concrete box consisting of the left and right side plates, the upper floor plate and the lower floor plate as a reaction force, and suspending a new concrete box from above the rear of the propelled jack shrunk in the tail part of the shield machine The installation box according to any one of claims 1 to 4, wherein the installation step of lowering and joining the existing concrete box is appropriately repeated, and the concrete box is sequentially buried in a column in an open shield method. Support for body connection.