Pc prefabricated small box girder joint steel bar structure and forming method

Abstract

The invention discloses a pc prefabricated small box girder node reinforcing steel bar structure which comprises bottom web U-shaped stirrups, bottom web U-shaped stirrups, groove-shaped hooked bars, bottom plate longitudinal reinforcing steel bars, prestressed corrugated pipes and corner reinforcing ribs, outer-layer bottom web U-shaped stirrups are placed on an assembling platform at equal intervals, outer-layer web longitudinal reinforcing steel bars are bound on the outer-layer bottom web U-shaped stirrups, and outer-layer bottom web U-shaped stirrups and outer-layer bottom web U-shaped stirrups are arranged at equal intervals. The inner-layer bottom web U-shaped stirrups are assembled at the corresponding positions of the outer-layer bottom web U-shaped stirrups, the inner-layer web longitudinal steel bars are bound on the inner-layer bottom web U-shaped stirrups, the groove-shaped hooked bars are assembled at the corners of each row of U-shaped stirrups and bound, and a closed area is formed at the bottom web node. The structural design of the inner and outer U-shaped stirrups is adopted, so that the stress condition of the reinforcing steel bars at the corners is clearer, the stress of the reinforcing steel bars at the corners is improved, arrangement of prestressed ducts is facilitated, and prefabricated small box girder reinforcing steel bar component design construction can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a PC prefabricated small box beam node steel bar structure and a forming method. Background Art

[0002] With the rapid development of bridge construction in my country, there are more and more bridge types, and the performance requirements for bridge structures are also increasing. At present, in terms of bridge construction, prefabricated prestressed concrete small box girders have been rapidly developed and widely used in the construction of small and medium span highway and railway bridges due to their good mechanical performance, factory processing, and convenient construction.

[0003] Since the existing closed stirrup bottom web corners are too densely reinforced, the quality of the subsequent concrete pouring is affected. In addition, the conventional PC prefabricated small box girder prestressed pipe layout site has the problem that the process of passing the prestressed corrugated pipe is complicated and difficult to control, which is not conducive to the componentized construction of steel bars, is not suitable for the current rapid construction mode of bridge engineering, and reduces work efficiency. Summary of the invention

[0004] In order to overcome the technical problems in the prior art, the present invention provides a PC prefabricated small box girder node steel bar structure and forming method, which solves the above technical problems.

[0005] A PC prefabricated small box girder node reinforcement structure comprises an outer bottom web U-shaped stirrup, an inner bottom web U-shaped stirrup, an outer web longitudinal reinforcement, an inner web longitudinal reinforcement, a prestressed corrugated pipe, a groove hook reinforcement, an outer bottom plate longitudinal reinforcement, an inner bottom plate longitudinal reinforcement, corner reinforcement and an assembly platform.

[0006] The U-shaped stirrups of the outer bottom web are placed on the assembly platform at equal intervals, and the longitudinal reinforcement of the outer web is tied to the U-shaped stirrups of the outer bottom web.

[0007] The inner bottom web U-shaped stirrups are assembled at the corresponding positions of each outer bottom web U-shaped stirrup, and the inner web longitudinal reinforcements are tied to the inner bottom web U-shaped stirrups.

[0008] The channel hook bars are assembled and tied at the corners of each row of U-shaped stirrups to form a closed area at the bottom web node.

[0009] In the above-mentioned PC prefabricated small box girder node reinforcement structure, the outer bottom web U-shaped stirrups open the traditional closed stirrups and are arranged on the assembly platform at equal intervals.

[0010] The above-mentioned PC prefabricated small box girder node reinforcement structure, the outer web longitudinal reinforcement and the outer bottom plate longitudinal reinforcement are tied to the outer bottom web U-shaped stirrups after the outer bottom web U-shaped stirrups are placed on the assembly platform to form an outer steel mesh.

[0011] In the above-mentioned PC prefabricated small box girder node steel bar structure, the inner bottom web U-shaped stirrups open the traditional closed stirrups and are assembled with the outer bottom web U-shaped stirrups at corresponding positions to form a steel bar skeleton.

[0012] The above-mentioned PC prefabricated small box girder node reinforcement structure, after the inner layer web longitudinal reinforcement and the inner layer bottom plate longitudinal reinforcement are completed, the outer layer longitudinal reinforcement is accurately tied to the inner layer bottom web U-shaped stirrups to form an inner layer reinforcement mesh.

[0013] In the above-mentioned PC prefabricated small box beam node reinforcement structure, the groove hook reinforcement is arranged at the corners as the transverse stirrup after the outer bottom web U-shaped stirrups and the inner bottom web U-shaped stirrups are assembled, forming a closed area at the corners of each row. When the force at the corners of the bottom web reaches the requirements, the groove steel bar can be eliminated, which is more conducive to the arrangement of the prestressed corrugated pipe and improving the pouring quality of the concrete at the corners of the bottom web.

[0014] A forming method for a PC prefabricated small box beam node steel bar structure, the forming method comprising the following steps:

[0015] S1: Process the outer bottom web U-shaped stirrups and the inner bottom web U-shaped stirrups in the steel bar processing plant, and fold the straight bars into U-shaped stirrups;

[0016] S2: Arrange the bent outer U-shaped stirrups on the assembly platform according to the designed spacing, and accurately tie the outer web longitudinal steel bars and the outer bottom plate longitudinal steel bars as well as the corner reinforcement bars to the outer bottom web U-shaped stirrups according to the design drawings;

[0017] S3: arranging the prestressed corrugated pipe at a determined position;

[0018] S4: Assemble the bent inner bottom web U-shaped stirrups at the corresponding position of each outer U-shaped stirrup, and accurately tie the inner web longitudinal reinforcement and inner bottom plate longitudinal reinforcement as well as the corner reinforcement to the inner bottom web U-shaped stirrups according to the design drawings;

[0019] S5: Install the grooved hook reinforcement at the corners of the outer bottom web U-shaped stirrups and the inner bottom web U-shaped stirrups to form a closed area at the bottom web node, and continue to tie to complete the prefabricated small box girder bottom web reinforcement skeleton.

[0020] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0021] 1. The present invention discloses a PC prefabricated small box girder node steel bar structure, which adopts the structural design of internal and external U-shaped stirrups, so that the stress condition of the steel bars at the corners is clearer, improves the stress of the steel bars at the corners, facilitates the layout of the prestressed duct, and is conducive to the component design and construction of the prefabricated small box girder steel bars;

[0022] 2. The present invention provides a PC prefabricated small box girder node reinforcement structure, which adopts the structural design of internal and external U-shaped stirrups, can effectively reduce manual errors, thereby improving the accuracy of the prestressed corrugated pipe and the overall quality of concrete pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 It is a schematic diagram of the overall structure of a PC prefabricated small box girder node steel bar structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the front structure of the steel bar section at the corner of the node steel bar structure of a PC prefabricated small box girder of the present invention;

[0026] Figure 3 It is a schematic diagram of the forming process of placing the outer bottom web U-shaped stirrups on the assembly platform according to the present invention;

[0027] Figure 4 It is a schematic diagram of the forming process of placing the inner bottom web U-shaped stirrups on the assembly platform according to the present invention;

[0028] Figure 5 It is a schematic diagram of the side structure of the bottom web steel bar skeleton of a PC prefabricated small box girder node steel bar structure on an assembly platform of the present invention;

[0029] In the figure: 1-U-shaped stirrups of outer bottom web, 2-U-shaped stirrups of inner bottom web, 31-longitudinal reinforcement of outer web, 32-longitudinal reinforcement of inner web, 4-prestressed corrugated pipe, 5-groove hook reinforcement, 61-longitudinal reinforcement of outer bottom plate, 62-longitudinal reinforcement of inner bottom plate, 7-reinforcement ribs at corners, 8-assembly platform. DETAILED DESCRIPTION

[0030] like Figure 1 As shown, it is a schematic diagram of the overall structure of a PC prefabricated small box girder node reinforcement structure of the present invention, including an outer bottom web U-shaped stirrup 1, an inner bottom web U-shaped stirrup 2, an outer web longitudinal reinforcement 31, an inner web longitudinal reinforcement 32, a prestressed corrugated pipe 4, a groove-shaped hook reinforcement 5, an outer bottom plate longitudinal reinforcement 61, an inner bottom plate longitudinal reinforcement 62, corner reinforcement ribs 7 and an assembly platform 8.

[0031] like Figure 2The figure shows the front structural diagram of the steel bar section at the corner of the present invention. The outer bottom web U-shaped stirrups 1 are placed on the assembly platform 8 at equal intervals, and the outer web longitudinal steel bars 31 are tied to the outer bottom web U-shaped stirrups 1; the inner bottom web U-shaped stirrups 2 are assembled at the corresponding positions of each outer bottom web U-shaped stirrup 1, and the inner web longitudinal steel bars 32 are tied to the inner bottom web U-shaped stirrups 2. The inner bottom web U-shaped stirrups 2 open the traditional closed stirrups and are assembled with the outer bottom web U-shaped stirrups 1 at the corresponding positions to form a steel bar skeleton. The grooved hook bars 5 are assembled and tied at the corners of each row of U-shaped stirrups to form a closed area at the bottom web node.

[0032] After the outer bottom web U-shaped stirrups 1 are placed on the assembly platform 8, the outer longitudinal steel bars 31 and the outer bottom plate longitudinal steel bars 61 are tied to the outer bottom web U-shaped stirrups 1 to form an outer steel mesh.

[0033] After the inner layer web longitudinal steel bars 32 and the inner layer bottom plate longitudinal steel bars 62 are completed, the outer layer longitudinal steel bars are accurately tied to the inner layer bottom web U-shaped stirrups 2 to form an inner layer steel mesh.

[0034] After the outer layer bottom web U-shaped stirrups 1 and the inner layer bottom web U-shaped stirrups 2 are assembled, the groove hook reinforcement 5 is arranged at the corners as the transverse stirrups to form a closed area at the corners of each row.

[0035] A forming method for a PC prefabricated small box beam node steel bar structure, the forming method comprising the following steps:

[0036] Step 1: Process the outer bottom web U-shaped stirrups 1 and the inner bottom web U-shaped stirrups 2 in a steel bar processing plant, and fold the straight bars into U-shaped stirrups;

[0037] Step 2: Arrange the bent outer U-shaped stirrups on the assembly platform 8 according to the designed spacing, and accurately tie the outer web longitudinal steel bars 31 and the outer bottom plate longitudinal steel bars 61 as well as the corner reinforcement bars 7 to the outer bottom web U-shaped stirrups 1 according to the design drawings. Figure 3 As shown, it is a schematic diagram of the forming process of placing the outer bottom web U-shaped stirrup 1 on the assembly platform 8;

[0038] Step 3: Arrange the prestressed corrugated pipe 4 at a determined position;

[0039] Step 4: Assemble the bent inner bottom web U-shaped stirrups 2 at the corresponding positions of each outer U-shaped stirrup 1, and accurately tie the inner web longitudinal steel bars 32 and the inner bottom plate longitudinal steel bars 32 and the corner reinforcement bars 7 to the inner bottom web U-shaped stirrups 2 according to the design drawings. Figure 4 As shown, it is a schematic diagram of the forming process of placing the inner bottom web U-shaped stirrup 2 on the assembly platform 8;

[0040] Step 5: Install the groove hook reinforcement 5 at the corners of the outer bottom web U-shaped stirrup 1 and the inner bottom web U-shaped stirrup 2 to form a closed area at the bottom web node, and continue to tie to complete the prefabricated small box girder bottom web reinforcement skeleton, such as Figure 5 , which is a schematic diagram of the side structure of the bottom web steel reinforcement skeleton on the assembly platform 8 of the present invention.

Claims

1. A PC prefabricated small box beam node reinforcement structure, characterized in that: It comprises an outer bottom web U-shaped stirrup (1), an inner bottom web U-shaped stirrup (2), an outer web longitudinal steel bar (31), an inner web longitudinal steel bar (32), a prestressed corrugated pipe (4), a groove hook bar (5), an outer bottom plate longitudinal steel bar (61), an inner bottom plate longitudinal steel bar (62), a corner reinforcement bar (7) and an assembly platform (8); The outer bottom web U-shaped stirrups (1) are placed on the assembly platform (8) at equal intervals, and the outer bottom web longitudinal steel bars (31) are tied to the outer bottom web U-shaped stirrups (1); The inner layer bottom web U-shaped stirrups (2) are assembled at the corresponding position of each outer layer bottom web U-shaped stirrup (1), and the inner layer web longitudinal steel bars (32) are tied to the inner layer bottom web U-shaped stirrups (2); The grooved hook reinforcement (5) is assembled and tied at the corners of each row of U-shaped stirrups to form a closed area at the bottom web node.

2. A PC prefabricated small box beam node steel bar structure according to claim 1, characterized in that: The outer bottom web U-shaped stirrups (1) open the traditional closed stirrups and are arranged on the assembly platform (8) at equal intervals.

3. A PC prefabricated small box beam node steel bar structure according to claim 1, characterized in that: After the outer layer bottom web U-shaped stirrups (1) are placed on the assembly platform (8), the outer layer longitudinal steel bars (31) and the outer layer bottom plate longitudinal steel bars (61) are tied to the outer layer bottom web U-shaped stirrups (1) to form an outer layer steel mesh.

4. A PC prefabricated small box beam node steel bar structure according to claim 1, characterized in that: The inner bottom web U-shaped stirrups (2) open the traditional closed stirrups and are assembled with the outer bottom web U-shaped stirrups (1) at corresponding positions to form a steel reinforcement skeleton.

5. A PC prefabricated small box beam node steel bar structure according to claim 1, characterized in that: After the inner layer web longitudinal steel bars (32) and the inner layer bottom plate longitudinal steel bars (62) are completed, the outer layer longitudinal steel bars are accurately tied to the inner layer bottom web U-shaped stirrups (2) to form an inner layer steel mesh.

6. A PC prefabricated small box beam node reinforcement structure according to claim 1, characterized in that: The grooved hook reinforcement (5) is arranged at the corners as a transverse stirrup after the outer bottom web U-shaped stirrup (1) and the inner bottom web U-shaped stirrup (2) are assembled, forming a closed area at the corner of each row.

7. A method for forming a PC prefabricated small box beam node steel bar structure, characterized in that: The molding method comprises the following steps: S1: processing the outer bottom web U-shaped stirrups (1) and the inner bottom web U-shaped stirrups (2) in a steel bar processing plant to fold the straight bars into U-shaped stirrups; S2: Arrange the bent outer U-shaped stirrups on the assembly platform (8) according to the designed spacing, and accurately tie the outer web longitudinal steel bars (31) and the outer bottom plate longitudinal steel bars (61) as well as the corner reinforcement bars (7) to the outer bottom web U-shaped stirrups (1) according to the design drawings; S3: arranging the prestressed corrugated pipe (4) at a determined position; S4: Assemble the bent inner bottom web U-shaped stirrups (2) at the corresponding positions of each outer U-shaped stirrup (1), and accurately tie the inner web longitudinal steel bars (32), the inner bottom plate longitudinal steel bars (32) and the corner reinforcement bars (7) to the inner bottom web U-shaped stirrups (2) according to the design drawings; S5: Install the groove hook reinforcement (5) at the corners of the outer bottom web U-shaped stirrup (1) and the inner bottom web U-shaped stirrup (2) to form a closed area at the bottom web node, and continue to tie to complete the prefabricated small box girder bottom web reinforcement skeleton.

Images