CN201660850U - Temporary anchoring structure during construction of a self-anchored bridge - Google Patents

Abstract

The utility model belongs to the technical field of construction engineering, in particular to a temporary anchoring structure used for system conversion during the construction process of a self-anchored bridge. Its characteristics are: while constructing the cap of the main bridge, the temporary anchorage is poured together, and when the lower structure of the approach bridge is constructed, multiple piers close to the main bridge are connected to form a frame structure; after the main cable is installed in place and anchored to the main After the anchor block at the end of the beam, the temporary anchor cable on the temporary anchor is initially stretched; while the standard section of the main girder in the middle is hoisted, the temporary anchor cable on the temporary anchor is gradually stretched until the main bridge is closed; after the main bridge is closed , release the tensile force of the temporary anchor cables at the temporary anchorage step by step in a controlled manner, and complete the system conversion; adjust the cable force of the whole bridge, and remove the temporary anchorage. The effect and benefit of the utility model is to make full use of the existing structure of the bridge to form a temporary anchorage structure, which reduces the volume of the temporary anchorage, reduces the project cost, and shortens the construction period; at the same time, the system conversion process is stable and safe, and the construction process is reduced. risk.

Description

Temporary anchoring structure during construction of a self-anchored bridge

technical field

The utility model belongs to the technical field of construction engineering, and relates to a method for converting a temporary ground anchor system into a permanent self-anchor system by adopting a system conversion method in the construction process of bridge engineering, in particular to a temporary anchor structure in the system conversion process.

Background technique

Self-anchored bridges traditionally adopt the construction sequence of erecting beams first and then hanging cables. This construction method requires the establishment of a large number of temporary supports to support the main beam. On the one hand, it increases the project cost and prolongs the construction period; on the other hand, it interferes with the normal traffic order of the waterway, and it is very difficult or even impossible to set up supports in large rivers or deep sea areas. This construction method limits the application and popularization of self-anchored bridges.

In order to overcome the disadvantages of the above-mentioned support construction method, a construction method without support, that is, the construction method of first hanging the cable and then erecting the beam came into being. The Suzhou Zhuyuan Bridge, which has been completed and opened to traffic, was constructed using this method. During the construction of the bridge, the main cable is anchored to the anchor block at the end of the concrete beam, and the anchor block is pulled on the temporary anchorage by a temporary anchor cable. In the construction process, there is no difference in mechanics from the traditional ground anchor bridge, so it has the advantages of simple form and clear force, but the anchor structure needs to build a huge temporary anchor, which will inevitably increase the project cost and prolong Construction period.

Contents of the invention

The technical problem to be solved by the utility model is to provide a temporary anchoring structure in the construction process of the self-anchored bridge. This structure can not only reduce the project cost, shorten the construction period, but also ensure the navigation under the bridge.

The technical scheme of the utility model is that the frame structure composed of the bridge pier column, and the side pier cap of the main bridge and the temporary anchor cable together form the temporary anchor structure in the construction process of the self-anchored bridge.

The utility model specifically comprises the following steps:

Step 1: Pour temporary anchorage while constructing the cap of the main bridge, and connect multiple piers close to the main bridge into a frame structure when constructing the lower structure of the approach bridge;

Step 2: After the main cable is installed in place and anchored to the anchor block at the end of the main beam, tension the temporary anchor cable on the temporary anchor for the first time;

Step 3: While hoisting the standard section of the main girder in the middle, gradually stretch the temporary anchor cables on the temporary anchor until the main bridge is closed;

Step 4: After the main bridge is closed, release the tensile force of the temporary anchor cables at the temporary anchorage step by step in a controlled manner to complete the system conversion;

Step 5: Adjust the cable force of the whole bridge and remove the temporary anchorage.

Effect and benefit of the present utility model are:

The temporary anchoring structure makes full use of the existing caps and piers of the bridge structure, reduces the volume of the temporary anchorage, can greatly save the project cost, shortens the construction period, and ensures navigation under the bridge during the construction period; the temporary anchoring structure adopts The combined structure of the main bridge cap and the approach bridge pier frame structure is used to jointly bear the horizontal force of the main cable, and the overall bearing capacity of the anchorage structure is increased.

Description of drawings

Figure 1 is a schematic diagram of the elevation of the temporary anchorage structure during the system conversion process.

In the figure: 1 temporary anchor cable PG1; 2 temporary anchor cable PG2; 3 temporary anchor cable PG3; 4 limit steel pipe; 5 main beam anchor block; 6 temporary anchor; 7 frame structure.

Figure 2 is a schematic plan view of the temporary anchoring structure during system conversion.

In the figure: 1 temporary anchor cable PG1; 2 temporary anchor cable PG2; 3 temporary anchor cable PG3; 4 limit steel pipe; 5 main beam anchor block; 6 temporary anchor; 7 frame structure.

Detailed ways

The specific embodiment of the utility model is described in detail below in conjunction with the technical scheme and the accompanying drawings of the description.

1. According to the design and calculation results, the temporary anchorage during the system conversion process will be poured at the same time as the side pier cap of the main bridge is being constructed; the multiple pier columns close to the side pier of the main bridge will be connected into a frame structure during the construction of the lower structure of the approach bridge ;

2. Suspend the main cable and anchor the main cable to the anchor block at the end of the concrete beam. The frame structure consisting of beam end anchor block, temporary anchorage and multiple pier columns of the approach bridge is connected by temporary anchor cables;

3. Pull the temporary anchor cable for the first time on the temporary anchorage;

4. Hoist the standard section of the box girder in the middle, and gradually stretch the temporary anchor cable until the main bridge is closed;

5. After the main bridge is closed, start to release the cable force of the temporary anchor cable to complete the system conversion process. When the system is converted, the cable force of the temporary anchor cable is gradually released three times, and both sides of the main bridge are released synchronously and symmetrically. The specific implementation process is as follows: first release the cable forces of PG1 and PG2 to 50%, then release all the cable forces of PG3 at one time, and finally release all the remaining cable forces of PG1 and PG2.

6. Adjust the cable force of the whole bridge and remove the temporary anchorage.

Material characteristics: Temporary anchors are made of C30 concrete; temporary anchor cables are made of parallel steel wires with a standard strength of 1670Mpa.

Claims (1)

1. the temporary anchoring structure in the self-anchored bridge construction process is applicable in the self-anchoring type bridge erection without scaffolding process, it is characterized in that:

The access bridge pier stud is formed framework, and becomes temporary anchoring structure with main bridge abutment pier cushion cap and interim anchor cable mutual group, is used for self-anchored bridge construction process anchoring temporarily main push-towing rope.

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