Bridge hollow pier partition plate construction method

Abstract

The invention relates to a bridge hollow pier partition plate construction method. The method comprises the steps that firstly, a profile steel support is reserved when a bridge hollow pier is constructed; 2, construction of a prefabricated partition plate with profile steel is completed on the ground; thirdly, the partition plate is hoisted to the top of the profile steel support through a crane, and adjustment and fixation are completed; fourthly, a gap between the bottom of the partition plate and the top of the completed hollow pier is filled and plugged with a plugging material; and fifthly, a hollow pier reinforcement cage is bound, the completed partition plate serves as an inner film or a bottom film, and continuous construction of the hollow pier column or the partition plate is completed. According to the method, bridge hollow pier partition plate construction is achieved, a support formwork system does not need to be manually erected and disassembled during partition plate construction, and the construction efficiency is improved; partition plate prefabrication solves the problem of cutting and splicing of a chamfering inner mold at a partition plate bottom mold, and mold plate loss is reduced. Partition plates are prefabricated according to the design size, the design structure size is prevented from being changed in some construction methods, and structural safety is ensured. And important practical significance is achieved for safe, efficient and accurate construction of the bridge hollow pier partition plate.

Description

Technical Field

[0001] The invention relates to a bridge construction method, in particular to a bridge hollow pier diaphragm construction method. Background Art

[0002] Most high bridge piers are hollow piers. A chamfered horizontal partition is set at a certain height vertically. The partition protrudes from the hollow pier body. The partition and the hollow pier body are connected by chamfered concrete and steel bars. Compared with the hollow pier itself, which is a special shape, the partition often requires a bracket and a bottom formwork system to complete the construction. The construction of the partition is a difficult point and the key point in the construction process of the high pier.

[0003] At present, the construction of hollow pier diaphragms in China usually adopts the full-frame support formwork system method, the pre-embedded I-beam or bracket support on the side wall of the hollow pier as the support system of the hollow pier diaphragm of the bridge, or the new concrete bracket method is used to change the design size of the diaphragm structure. These methods cannot solve the difficulties in installing and removing the support formwork system, or the hidden dangers of changing the structural design size, or the safety problems of limited space operations during construction, or the high labor intensity. How to quickly, safely, efficiently and accurately complete the construction of hollow pier diaphragms of bridges has become a problem that bridge construction technicians urgently need to explore and solve. Summary of the invention

[0004] The present invention aims to solve the problem of difficulty in erecting and dismantling the support system in the construction of hollow pier diaphragms of bridges, and to provide a safe, efficient, reliable and accurate method for constructing hollow pier diaphragms of bridges, thereby improving construction efficiency and reducing the construction cost of the support system.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for constructing a hollow pier diaphragm of a bridge, comprising the following steps:

[0006] Step 1: Construct the pre-buried steel support for the hollow pier of the bridge

[0007] When tying the steel cage of the hollow pier of the bridge, use steel bars to fix the steel support and the steel cage of the hollow pier of the bridge. The top surface of the steel support is consistent with the bottom elevation of the diaphragm steel, and the top surface of the concrete pouring of the hollow pier of the bridge is flush with the bottom of the diaphragm.

[0008] Step 2: Prefabricate the partition with steel strips on the ground;

[0009] Considering the size and weight of the partition and the performance of the on-site lifting equipment, the partition is layered in the thickness direction and divided into blocks in the horizontal direction. The corresponding partition steel that meets the force requirements is selected. Holes are opened at both ends of the partition steel for lifting and for the hollow pier stirrups to pass through.

[0010] Step 3: Use a crane to lift the partition with steel sections to the top of the steel section support and complete the adjustment and fixation;

[0011] The partition is lifted by a crane at four points or multiple points to the top of the steel support, and its position is measured and verified. Thin steel sheets are used to pad it to meet the design requirements. After passing the requirements, the partition steel and steel support in the partition are welded and fixed;

[0012] Step 4: Use sealing materials to fill and seal the gap between the bottom of the partition and the top of the hollow pier of the bridge;

[0013] Step 5: Use the completed partition as the inner membrane or bottom membrane to complete the hollow pier column or partition of the bridge and continue construction.

[0014] Furthermore, when the diaphragm is prefabricated in one go, the diaphragm acts as the inner formwork system of the hollow pier of the bridge, eliminating the need for an inner formwork support system; when the diaphragm is horizontally layered or vertically divided into blocks, the diaphragm acts as the inner formwork of the hollow pier of the bridge and the bottom membrane of the bottom plate of the cast-in-place part of the diaphragm; the embedded steel supports, diaphragms and diaphragm steel in the hollow pier of the bridge act as load-bearing supports.

[0015] Furthermore, the steel supports and partition steels are made of I-beams, channel steels, angle steels or steel pipes.

[0016] Furthermore, the partition steel is fixed to the hollow pier steel cage of the bridge by using steel bars or angle steel.

[0017] Furthermore, the sealing material is mortar, sealant or other anti-seepage materials.

[0018] Beneficial effects of the present invention:

[0019] The construction method of the present invention can ensure that during the construction of the hollow pier of the bridge, the support-free construction of the hollow pier diaphragm of the bridge is achieved, effectively solving the problem of difficulty in erecting the support system of the hollow pier diaphragm of the bridge, the hidden dangers of changing the structural design dimensions, and the safety problems of limited space operations during the construction process, reducing the loss of the support system and improving the construction efficiency of the hollow pier diaphragm, which has important practical significance for the safe, efficient and accurate construction of the hollow pier diaphragm of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the elevation drawing of the hollow pier of the bridge;

[0021] Figure 2 It is the elevation drawing of the hollow pier diaphragm of the bridge;

[0022] Figure 3 It is the cross-section of the hollow pier diaphragm of the bridge;

[0023] Figure 4 It is a schematic diagram of the structural elevation of the present invention;

[0024] Figure 5 It is a schematic cross-sectional view of the structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the prefabricated facade of the partition and partition steel;

[0026] Figure 7 This is a schematic elevation diagram of the completed hollow pier steel embedded parts of the bridge;

[0027] Figure 8 This is a schematic diagram of the completed bridge hollow pier steel embedded parts-partition installation elevation;

[0028] Fig. 9 It is a schematic diagram of the completed bridge hollow pier steel embedded parts - partition hoisting facade - steel bar binding completed facade;

[0029] Fig.10 The partition acts as the side formwork for the concrete pouring of the hollow pier of the bridge to complete the elevation diagram;

[0030] Fig.11 The partition acts as the side form and bottom membrane bridge hollow pier concrete pouring completed elevation diagram;

[0031] In the figure: 1. Hollow pier of bridge, 2. Steel support, 3. Partition steel, 4. Partition, 5. Thin steel sheet, 6. Sealing material. DETAILED DESCRIPTION

[0032] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0033] like Figures 1 to 11 As shown, a method for constructing a hollow bridge pier diaphragm of the present invention comprises the following steps:

[0034] Step 1: construct the embedded steel support for the hollow pier of the bridge;

[0035] When tying the steel cage of the hollow pier 1 of the bridge, use steel bars to fix the steel support 2 and the steel cage of the hollow pier 1 of the bridge, the top surface of the steel support 2 is consistent with the bottom elevation of the diaphragm steel 3, and the top surface of the concrete pouring of the hollow pier 1 of the bridge is flush with the bottom of the diaphragm 4 (the bottom of the chamfer);

[0036] Step 2: Prefabricate the partition with steel strips on the ground;

[0037] Combined with the size and weight of the partition 4 and the performance of the hoisting equipment used on site, the partition 4 is layered in the thickness direction and divided into blocks in the horizontal direction. According to the determined layer thickness, the weight of the prefabricated partition is calculated, and the corresponding partition steel 3 that meets the force requirements is selected. The partition steel 3 can be opened at both ends for hoisting and for the bridge hollow pier stirrups to pass through;

[0038] Step 3: Use a crane to lift the partition with steel sections to the top of the steel section support and complete the adjustment and fixation;

[0039] Use a crane to lift the partition 4 to the top of the steel support 2 at four or more points, measure and verify its position, and use thin steel sheets 5 to pad it to meet the design requirements. After passing the test, weld and fix the partition steel 3 in the partition 4 and the steel support 2 of the hollow pier 1 of the bridge;

[0040] Step 4: Use the plugging material 6 to fill and plug the gap between the bottom of the partition 4 and the top of the hollow pier 1;

[0041] Step 5: Use the completed partition as the inner membrane or bottom membrane to complete the hollow pier column or partition of the bridge and continue construction.

[0042] When the diaphragm 4 is fully prefabricated at one time, the diaphragm 4 acts as the inner formwork system of the hollow pier 1 of the bridge, eliminating the need for the construction and removal of the inner formwork support system; when the diaphragm 4 is horizontally layered or vertically divided into blocks, the diaphragm 4 acts as the inner formwork of the hollow pier 1 of the bridge and the bottom membrane of the bottom plate of the cast-in-place part of the diaphragm 4; the pre-buried steel support 2 of the hollow pier 1 of the bridge and the diaphragm 4 and the diaphragm steel 3 act as load-bearing supports.

[0043] The embedded steel support 2 can be made of I-beams, channel steels, angle steels, steel pipes, etc.; the steel support 2 can be fixed with the steel cage of the hollow pier 1 using steel bars or angle steels; the top elevation of the steel support 2 needs to be controlled to be consistent with the bottom elevation of the partition steel 3.

[0044] The partition steel 3 may be made of I-beams, channel steels, angle steels, steel pipes, and the like.

[0045] The sealing material 6 is mortar, sealant or other anti-seepage materials.

Claims

1. A method for constructing a hollow bridge pier diaphragm, characterized in that: The following steps are involved: Step 1: Construct the pre-buried steel support for the hollow pier of the bridge When tying the steel cage of the hollow pier of the bridge, use steel bars to fix the steel support and the steel cage of the hollow pier of the bridge. The top surface of the steel support is consistent with the bottom elevation of the diaphragm steel, and the top surface of the concrete pouring of the hollow pier of the bridge is flush with the bottom of the diaphragm. Step 2: Prefabricate the partition with steel strips on the ground; Considering the size and weight of the partition and the performance of the on-site lifting equipment, the partition is layered in the thickness direction and divided into blocks in the horizontal direction. The corresponding partition steel that meets the force requirements is selected. Holes are opened at both ends of the partition steel for lifting and for the hollow pier stirrups to pass through. Step 3: Use a crane to lift the partition with steel sections to the top of the steel section support and complete the adjustment and fixation; The partition is lifted by a crane at four points or multiple points to the top of the steel support, and its position is measured and verified. Thin steel sheets are used to pad it to meet the design requirements. After passing the requirements, the partition steel and steel support in the partition are welded and fixed; Step 4: Use sealing materials to fill and seal the gap between the bottom of the partition and the top of the hollow pier of the bridge; Step 5: Use the completed partition as the inner membrane or bottom membrane to complete the hollow pier column or partition of the bridge and continue construction.

2. The method for constructing a hollow bridge pier diaphragm according to claim 1, characterized in that: When the diaphragm is prefabricated in one go, it acts as the inner formwork system of the hollow pier of the bridge, eliminating the need for the inner formwork support system; when the diaphragm is horizontally layered or vertically divided into blocks, it acts as the inner formwork of the hollow pier of the bridge and the bottom membrane of the bottom plate of the cast-in-place part of the diaphragm; The embedded steel supports, partitions and partition steels in the hollow piers of bridges act as load-bearing brackets.

3. The method for constructing a hollow bridge pier diaphragm according to claim 1, characterized in that: Steel supports and partition steel are made of I-beams, channel steels, angle steels or steel pipes.

4. The method for constructing a hollow bridge pier diaphragm according to claim 1, characterized in that: The partition steel is fixed with steel bars or angle steel and the steel cage of the hollow pier of the bridge.

5. The method for constructing a hollow bridge pier diaphragm according to claim 1, characterized in that: The sealing material is mortar, sealant or other anti-seepage materials.

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