JP2568987B2 - Support member for reinforcing steel assembly and bridge construction method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support member for a reinforcing bar assembly used to make a floor slab constituting a bridge and a method of constructing a bridge using the support member.

[0002]

2. Description of the Related Art In general, a bridge is constructed by passing a bridge girder on an abutment and a pier, providing a concrete floor slab thereon, and further laying asphalt on the floor slab.

In a conventional floor slab, a bridge girder is placed on an abutment or the like, and then a support is provided, a frame is formed with a control panel or the like. After reinforcing bars are combined in a grid in this frame, concrete is poured into the frame. After the concrete had hardened, the framework was removed and completed.

[0004] However, the work of assembling the rebar into the framework on the bridge girder passed over the abutment involves danger because it is an operation at a high place. Therefore, it is preferable that work in such a place be performed rationally and in a short time.

[0005] In this case, the most difficult thing in performing the work of incorporating the rebar into the framework is to arrange the main rebars and the force-supplying bars regularly in a predetermined space. It is troublesome to arrange rebars in parallel with the dimensions floating and maintain their overall shape in a grid. Conventionally, in order to assemble such reinforcing bars, a support member or a wire formed by welding a long iron plate has been used. However, it takes time and effort to form the support member, and workability is not good. There was a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and aims to minimize the work on a bridge girder and to simplify the work of assembling a reinforcing bar. It is an object of the present invention to provide a support member for assembling reinforcing bars, and to provide a bridge construction method using the support member.

[0007]

According to a first aspect of the present invention, there is provided a member having a constant height in a vertical direction, and having upper and lower ends of the member with gripping means for reinforcing bars, respectively. A support member for assembling a reinforcing bar, having at least one hole for receiving a connecting rod on a surface.

According to a second aspect of the present invention, the support member has a downwardly extending leg portion, and the leg portion is a distance between the reinforcing bar gripped by the gripping means at the lower end and the lower surface of the formwork used when forming the floor slab. The support member for assembling a reinforcing bar according to claim 1, wherein the size is defined according to the following.

According to a third aspect of the present invention, there is provided the support member for rebar assembly according to the first or second aspect, wherein the support member has a cutout penetrating both surfaces thereof.

According to a fourth aspect of the present invention, there is provided a member having a predetermined height in the vertical direction, having a gripping means at each of an upper end and a lower end, and receiving at least one or more connecting rods on the surface of the member. Positioning a support member having a hole between the two main bars, causing the two main bars to be gripped by the upper and lower gripping means, and creating a plurality of sets of two main bars,
A step of arranging the sets of the two main bars in parallel, inserting a connecting rod into the holes of the support members facing each other, holding the pair of the main bars in an upright state, and creating a main bar assembly, A step of forming a mold, a step of fixing the main reinforcement assembly in the formwork, and a step of incorporating and fixing a force distribution muscle in a direction orthogonal to the main reinforcement with respect to the main reinforcement assembly, A step of pouring ready-mixed concrete into a formwork and hardening to form a floor slab, the method for constructing a bridge using a support member for reinforcing steel assembly.

[0011]

According to the first aspect of the present invention, the supporting member can be positioned between the two reinforcing bars, and the reinforcing bars can be gripped in parallel by the upper and lower gripping means. In addition, in the hole of the support member located opposite to each other in the pair of two rebars,
Just by fixing the rod through the connecting rod, the two sets of rebars can be held in an upright state.

According to the second aspect of the present invention, since the supporting members can be positioned at the same height, the rebars vertically held by the supporting members are also held in parallel at the same height.

According to the third aspect of the invention, when the ready-mixed concrete is poured into the formwork, the ready-mixed concrete easily flows from one surface of the support member to the other surface through the notch.

According to the fourth aspect of the present invention, the two main reinforcements can be easily connected by the support member, and only by fixing the opposing support members through the connecting rods between the holes of the support members,
A pair of two main bars can be held upright.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 indicates a bridge constructed by applying the support member for rebar assembly of the present invention. The bridge 1 has a plurality of piers 5 and an abutment, and two bridge girders 7 are continuously arranged on adjacent piers 5 in parallel. Each bridge girder 7 is bolted to the pier 5 to prevent lateral displacement.

The floor slab 3 is mounted on the two bridge girders 7 placed in parallel. The floor slab 3 originally has a structure in which a reinforcing bar is combined with hardened concrete. However, in this embodiment, members 3 in a stage before pouring concrete are denoted by reference numeral 3 for convenience of explanation. And

The floor slab 3 is formed by pouring concrete into the formwork 11 in a state where the reinforcing bar assemblies 9 are arranged in a plurality of formwork 11 arranged in a row and hardening the concrete. It has a panel shape. The connecting part of each formwork 11 is designed so that the ready-mixed concrete does not leak out.
A connection plate (not shown) is applied from the back side.

As shown in FIG. 2, the reinforcing bar assembly 9 includes a plurality of main reinforcing bars 1 extending in the width direction (a direction perpendicular to the longitudinal direction of the bridge).
3 are arranged in two upper and lower stages, and a plurality of force distribution muscles 15 extending in the longitudinal direction of the bridge are arranged in two upper and lower stages, and are fixed to the main muscles 13 with wires at intersections with the main muscles 13. A support member 19 for assembling the reinforcing bar of the present invention is provided between the two main bars 13 corresponding to the upper and lower sides, respectively. This support member 19 has gripping claws 21 at both upper and lower ends of a rectangular iron plate, and a large cutout 23 is formed at the center of the iron plate.

As shown in FIG. 2, each of the gripping claws 21 is for winding and gripping the main muscle 13. The upper gripping nail 21 of each support member 19 grips the upper main muscle 13. The lower gripping claw 21 is the lower main bar 13
, The upper and lower main bars 13 are connected in parallel with each other. The notch 23 is formed so that the ready-mixed concrete can easily turn around the support member 19 when the ready-mixed concrete is poured into the mold 11.

Each support member 19 has holes 25 above and below the notch 23. Hole 25 in one support member 19 and hole 2 in support member 19 adjacent in the longitudinal direction of the bridge
The upper and lower two connecting rods 27 penetrate between them and are fixed by welding. This prevents the reinforcing bar assembly 9 from falling down in the longitudinal direction of the bridge and breaking its shape before the distribution bars 15 are provided. Note that one or three or more holes 25 may be formed in one support member 19. Leg members 29 for height adjustment are provided on both sides of each support member 19. As shown in FIG. 2, each leg member 29 has an upper portion bent at an angle, and one side of the leg member 29 is welded to the surface of the support member 19.

In the lower portion of the leg member 29, one of the two surfaces is cut immediately above the lower main bar 13, and the other surface extends below the lower main bar 13, and the height adjustment unit 31 is provided.
Is formed. Since the mold 11 has irregularities depending on places, the length of the height adjusting portion 31 is dimensioned according to the irregularities of the mold 11. This allows all support members 1
9 is maintained at a constant height, and the upper and lower main bars 13 are maintained at a constant height. The lower ends of the leg members 29 are each welded to the formwork 11.

In the present embodiment, the formwork 11 is not removed in the future, unlike the framework used for making a floor slab, and forms a part of the floor slab even after the floor slab 3 is completed. Has become. The mold 11 is composed of side molds 12 located at both ends in the width direction and a central mold 14 located at the center. The side mold 19 has a bottom surface 16 that is formed slightly obliquely and a side surface 18 that extends upward from the end thereof.
Also, the central mold 21 has two end faces 20 formed diagonally.
And a flat surface 22 located between both end surfaces 20. The bottom surface 16, the end surface 20, and the flat surface 22 constitute the lower surface of the floor slab.

The three members constituting the formwork 11 are independent members, but the leg members 29 are welded to the respective members of the formwork 11 so that they serve as a bridge to form the formwork 11. 11 as a whole is configured as an integral member. Although the side formwork 12 and the central formwork 14 are spaced apart, the side of each member of that part is located just above the two bridge girders 7, and concrete Are interposed and connected. The formwork 11 located at both ends of the bridge 1 is different from the other ones, and forms a side surface 24 on the end side connected to the side surface 18 at the longitudinal end side of the bridge 1 respectively.

Next, a method of constructing the bridge 1 having the above structure will be described. First, the piers 5 are installed at regular intervals in accordance with a conventional method, and two bridge girders 7 are continuously passed in parallel on adjacent piers 5. Each bridge girder 7 is fixed to the pier 5 with a bolt.

On the other hand, in a workplace different from the site, the main rebar assembly 17 is created by combining only the main rebars 13. First, the two main bars 13 are arranged in parallel, and the support
At 9, each gripping claw 21 is swaged to grip the two main bars 13. The support members 19 are provided at at least two positions with respect to the two main bars 13, preferably at three or more positions at substantially equal intervals according to the length of the main bars 13. Each main reinforcing bar 13 when the reinforcing bar assembly 9 is completed and the formwork 1 immediately below the main reinforcing bar 13.
The support member 19 having the leg member 29 whose length matches the location of each main bar 13 is selected from the beginning in consideration of the distance from the support member 19. If the length of the leg member 29 cannot be specified from the beginning, the support member 19 having the longer leg member 29 may be attached, and the leg member 29 may be cut into an appropriate length later.

In this way, a required number of sets in which the two main bars 13 are connected by the support member 19 are prepared.
Then, while arranging the two sets of main bars 13 in parallel with each other, the holes 25 of the corresponding support members 19 of the adjacent sets are arranged.
The parts are welded together through the connecting rods 27. Three or more holes 25 of the corresponding supporting member 19 of the set of two main bars 13 may be passed by one connecting rod 27.
By passing the connecting rod 27 through the hole 25, each pair of the two main bars 13 connected by the support member 19 is maintained in an upright state in a state of being parallel to the other pair of main bars.

When the connecting rod 27 is passed through the hole 25 of the support member 19, the length of the connecting rod 27 and the position of the connecting rod 27 are selected to connect all the sets of the two main bars 13 in series. Thus, one large main bar assembly 17 can be created, and a relatively small number of main bar assemblies such as two or three can be connected to create a plurality of smaller main bar assemblies 17. Such a choice is determined in consideration of the length of the bridge, the length of the set of formwork 11, the ease of transportation to the site, and the like.

Next, the formwork 11 is placed on the bridge girder 7, and the main reinforcement assembly 17 is set therein. At this time, as shown in FIG. 5, the lower ends of the leg members 29 are placed on the formwork 11, respectively. The leg members 29 of each support member 19 are fixed to the formwork 11 by welding. Then, as shown in FIG. 2, a plurality of force distribution bars 15 are inserted in a direction perpendicular to the main bars 13 and fixed by spot welding or winding a wire. One distribution bar 15 is less than the entire length of the bridge, but the adjacent main reinforcement 13
, The power distribution bars 15 are always arranged to straddle each other, and as a result, all the main reinforcements 13 are connected in series in the longitudinal direction by the plurality of power distribution bars 15. Thereby, the rebar assembly 9 is completed in the mold 11.

The ready-mixed concrete is poured into the mold 11. The poured ready-mixed concrete naturally flows to the opposite side through the notch 23 around the support member 19,
It can spread into the formwork. Thereafter, when the ready-mixed concrete hardens, the floor slab 3 is completed. In addition, the floor slab 3 of this embodiment differs from the conventional floor slab in that the formwork 11 remains adhered to the concrete and has a good appearance in appearance. By laying asphalt 33 on the completed floor slab 3, a road bridge is completed.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and even if there are changes within the scope not departing from the gist of the present invention, the present invention is not limited to this embodiment. included. For example, also in the case where the method of removing the formwork is adopted after the concrete is hardened as in the case of the conventional floor slab, the method of producing the reinforcing bar assembly using the support member of the present invention as described above can be adopted. .

[0031]

As described above, according to the present invention, two main bars can be easily connected to each other by using a support member, and a pair of two main bars can be fixed to a hole through a rod. You can easily keep it upright. Also, by having a leg member whose size is defined according to the distance between the main reinforcement gripped by the gripping means at the lower end and the lower surface of the formwork, the main reinforcement can be maintained at a constant height even if the lower surface of the formwork has irregularities. Can be arranged in parallel.

Further, due to the presence of the notch, the ready-mixed concrete tends to be uniform in the formwork, and the workability is good. According to the present invention, in the method for constructing a bridge, the work of assembling the main reinforcing bar does not need to be performed on the bridge girder, and the assembling work of the reinforcing bar can be performed simply and in a short time.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a bridge construction method of the present invention.

FIG. 2 is a perspective view showing a part of a reinforcing bar assembly produced using the support member of the present invention.

FIG. 3 is a cross-sectional view of a state in which a support member of the present invention is connected to a main bar and a connecting rod when viewed from a width direction of a bridge.

FIG. 4 is a view showing a state in which a support member of the present invention is connected to a main bar and a connecting rod when viewed from a longitudinal direction of a bridge.

FIG. 5 is a cross-sectional view of a bridge to which the support member of the present invention is applied, which is cut along a width direction of the bridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge 3 Floor slab 5 Bridge pier 7 Bridge girder 9 Rebar assembly 11 Formwork 12 Side formwork 13 Main reinforcement 14 Central formwork 15 Distributing muscle 16 Bottom 17 Main reinforcement assembly 18 Side surface 19 Supporting member 20 End face 21 Gripping claw 22 Flat surface 23 Notch 24 Side surface 25 Hole 27 Connecting rod 29 Leg member 31 Height adjustment unit 33 Asphalt

Claims (4)

(57) [Claims] 1. A member having a constant height in a vertical direction, having at least one of upper and lower ends of a gripping means of a reinforcing bar, and receiving at least one connecting rod on a surface of the member. A support member for assembling a reinforcing bar, comprising a hole. 2. The support member has a downwardly extending leg portion, and the leg portion has a dimension corresponding to a distance between a reinforcing bar gripped by the gripping means at the lower end and a lower surface of a formwork used for forming a floor slab. The support member for rebar assembly according to claim 1, wherein the support member is defined. 3. A supporting member for assembling a reinforcing bar according to claim 1, wherein said supporting member has a notch penetrating both sides thereof. 4. A support member having a certain height in the vertical direction, having a holding means at an upper end and a lower end, and having at least one hole for receiving a connecting rod on a surface of said member. Is positioned between the two main bars, the upper and lower gripping means respectively grip the two main bars, a step of creating a plurality of sets of two main bars, parallel the set of two main bars Forming a main bar assembly by inserting a connecting rod into a hole of the support member facing the other and holding the pair of main bars in an upright state, and forming a mold. A step of fixing the main reinforcement assembly in the formwork; a step of incorporating and fixing a force distribution bar in a direction perpendicular to the main reinforcement to the main reinforcement assembly; and pouring ready-mixed concrete into the formwork and hardening. And making the floor slab Method of constructing bridges using the supporting member for reinforcing bar assembly according to symptoms.