CN103711078A - Temporary girder-type support for bridge construction and dismantling method thereof - Google Patents

Abstract

The invention relates to a temporary beam-type support in bridge construction and a removal method thereof. First, the temporary girder group is suspended on the main girder of the completed bridge by means of distribution beams. Then, disconnect the connection between the distribution beam and the steel pipe, cut the steel pipe from the root of the steel pipe on the ground to remove the load in the temporary beam support, and then remove the steel pipe. Finally, use lifting equipment to lower the temporary beam group to the ground as a whole, and complete the split on the ground. Advantages: It avoids the shortcomings of many high-altitude operations and complex structures when using the traditional method of sandbox unloading and top-down demolition. Workers basically work on the ground. Therefore, the efficiency and safety of the construction are improved, and the construction cost is reduced.

Description

Temporary beam support and its removal method in bridge construction

technical field

The invention relates to a method for removing temporary beam-type supports in bridge construction. It is suitable for the demolition of various construction temporary stress structures. It can greatly reduce the high-altitude work of workers in demolition work, and improve construction efficiency and safety.

technical background

Temporary beam support is a temporary structure for construction, including steel pipes, temporary beams, and distribution beams. During construction, formwork pouring main beams are built on temporary beams, and temporary beams (such as Bailey beams, shaped steel, and military beams) are responsible for horizontal force transmission. The distribution beam is located between the steel pipe and the temporary beam, and is used to distribute the load of each temporary beam, and the steel pipe completes the vertical force transmission.

Compared with the beam-type support of the full hall support, the temporary beam-type support has the advantage of large span and little impact on the river channel, and is widely used in the construction of bridges constructed by integral cast-in-place and other methods. The temporary beam supports will need to be removed after the bridge is built. In traditional practice, a sandbox is pre-set between steel pipes and temporary beams. After the bridge construction is completed, the sand in the sandbox is released, and the load in the temporary beam support is removed. Then the temporary beams are removed at high altitude, and finally the steel pipe columns are removed. This demolition method works at heights with low efficiency and complex structure.

Contents of the invention

The purpose of the present invention is to provide a relatively safer and more efficient temporary beam support removal method. Utilize the present invention can overcome the deficiency in above-mentioned existing method.

Embodiments of the present invention are:

A temporary beam support in bridge construction, including temporary beams, distribution beams, steel pipes, and hoisting steel wires. The temporary beams used to build formwork pouring main beams with hoisting holes are placed on steel pipes through distribution beams, and the steel pipes stand on the ground. The hoisting hole is located directly above the distribution beam, and the hoisting steel wire passing through the hoisting hole and the distribution beam is used to hoist the temporary beam after the construction of the main beam is completed, and the steel pipe is cut directly after the temporary beam is hoisted.

A method for dismantling a temporary beam-type support in bridge construction, comprising the following steps: during the construction of the main beam, a hoisting hole is reserved on the main beam, the hoisting hole is located directly above the distribution beam, and the steel wire rope is passed through the main beam after the construction of the main beam is completed The hoisting holes reserved above are fixed on the distribution beam, and each temporary beam is hung on the main beam as a whole. After safety protection is done, the steel pipe is cut directly on the ground to remove the load in the temporary beam bracket, and the steel pipe is removed. , and finally the temporary beam is lowered to the ground as a whole by the lifting equipment on the top surface of the main beam, and the demolition is completed on the ground.

The basic features of the present invention are: 1. Cancel the sandbox that is pre-set in the structure in the traditional method. The load is relieved directly in the temporary beam support by cutting steel pipes at ground level. 2. Before cutting the steel pipe, hang the temporary beam group on the main beam that has been constructed. After removing the steel pipe, use the lifting equipment to lower the temporary beam to the ground as a whole, and complete the demolition on the ground.

Beneficial effect

The main demolition work is done on the ground, greatly reducing work at heights. Improve the efficiency and safety of demolition work.

Description of drawings

Figure 1 A schematic diagram of temporary beam support construction in bridge construction

Figure 2 Schematic diagram of cutting the steel pipe to remove the internal load of the bracket

Figure 3 Schematic diagram of the overall lowering of the temporary beam group to the ground

in:

1-Temporary support stringer

2- distribution beam

3-steel pipe

4- main beam

5- Lifting equipment

6-lifting hole

Detailed ways

Further details will be given below in conjunction with the embodiments and accompanying drawings. In the examples, Bailey beams are used as temporary beams, and steel pipes are used as vertical force transmission structures, which are only a more detailed description of the specific implementation of this patent, and are not intended to limit this patent.

The first step when removing the temporary beam support using this scheme is shown in Figure 1. Pass the hoisting hole 6 reserved on the main beam with a steel wire rope, and hang the temporary support longitudinal beam 1 integrally on the hoisting device 5 positioned at the top surface of the main beam 4 that has been constructed through the distribution beam 2 . The second step is shown in Figure 2. After the safety protection is done (in this example, the crawler crane is used to hang the top of the steel pipe to prevent the steel pipe from falling), the steel pipe 3 is directly cut on the ground to remove the load in the Bailey beam-steel pipe support, and the steel pipe 3 is removed. The third step is shown in Figure 3. The temporary support beam 1 is lowered to the ground as a whole by the hoisting device 5 on the main beam 4 after construction, and the demolition is completed on the ground.

Essential features of the present invention are:

1. Cancel the sandbox pre-set in the structure in the traditional method. The load in the Bailey beam-steel tube bracket is directly unloaded by cutting the steel tube 3 on the ground.

2. Reserve the hoisting hole 6 during the construction of the main beam. Before cutting the steel pipe, hang the temporary support longitudinal beam 1 on the main beam 4 that has been constructed. After removing the steel pipe 3, use the lifting device 5 to lower the temporary beam group 1 to the ground as a whole , to complete the demolition on the ground.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form. Any content that does not deviate from the technical solution of the present invention, according to the technical essence of the present invention, is within the spirit and principles of the present invention. Any modifications, equivalent changes and modifications made should be regarded as the technical scope of the solution of the present invention and should be included in the protection scope of the present invention.

Claims (2)

1. interim beam type support in a bridge construction, it is characterized in that comprising: interim beam, distribution beam, steel pipe, lifting steel wire, for build pouring template with the interim beam of the girder of hole for hoist by distributing roof beam structure in steel pipe, steel pipe stands on ground, described hole for hoist is positioned at directly over distribution beam, passes the lifting steel wire of hole for hoist and distribution beam for sling interim beam after main girder construction completes, and described steel pipe is directly cut after interim beam is lifted.

2. the method for dismounting of interim beam type support in a bridge construction, it is characterized in that comprising the following steps: during main girder construction, reserved hole for hoist on girder, hole for hoist is positioned at directly over distribution beam, after main girder construction completes by hole for hoist reserved on steel wire penetrating girder, and be fixed in distribution beam, by on each interim beam integral hanging girder, next the direct pipe cutting on ground, steel pipe is removed, finally by the crane gear on girder end face, interim beam integral body is transferred to ground, on ground, complete dismounting.

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