CN102493363B - Quick construction method for segment No.0 of continuous beam - Google Patents

Abstract

The invention discloses a quick construction method for a segment No.0 of a continuous beam, which includes: A10, constructing an assembly foundation along a bridge beside a main pier, wherein the assembly foundation is used for assembling an integral lifting platform for reinforced forms of the segment No.0; A20, synchronously constructing the integral lifting platform for the reinforced forms of the segment No.0 during construction of the main pier, wherein the integral lifting platform for the reinforced forms of the segment No.0 is complete before the main pier is complete; A30, lifting the integral lifting platform for the reinforced forms of the segment No.0 to the top of the main pier, and performing girder concreting with the segment No.0 and performing tensioning and grouting for a bridge body. By the method, the integral lifting platform for the reinforced forms of the segment No.0 is assembled and the forms are mounted and tied with rebars when construction of the main pier cap and a pier body starts, no interference with construction of the body of the main pier exists, and accordingly, construction period can be shortened greatly.

Description

Rapid Construction Method of No.0 Block of Continuous Beam

technical field

The invention relates to a construction method for a long-span continuous girder bridge, in particular to a rapid construction method for No. 0 block of the continuous girder.

Background technique

Long-span continuous girder bridges are generally constructed using the cantilever pouring method, which is mainly divided into four parts, namely, the No. 0 block of the top beam section of the pier, the symmetrical cantilever pouring part of the hanging basket, the straight line section of the side span, and the closing section of the side span and the middle span. Among them, the construction of No. 0 block is a very important stage in the construction of continuous beam cantilever pouring method.

At present, the conventional continuous beam No. 0 block construction method is to install the No. 0 block support system after the pier body is poured, then assemble the No. 0 block steel formwork on the support system, and finally pour concrete. It can be seen that the traditional construction method, the installation of No. 0 block formwork, steel bars, prestressed pipes, etc. must be carried out step by step after the construction of the pier body is completed, the construction period is relatively long, and it cannot meet the construction needs under the tight construction period.

Contents of the invention

The technical problem to be solved by the invention is to solve the problem that the construction period of the No. 0 block of the continuous beam is relatively long.

In order to solve the above technical problems, the technical solution adopted in the present invention is to provide a rapid construction method for No. 0 block of continuous beam, comprising the following steps:

A10, build the assembled foundation along the bridge direction beside the pier position of the main pier, and the assembled foundation is used to assemble the overall hoisting platform of No. 0 block reinforced formwork;

A20, while the main pier is being constructed, the No. 0 block reinforced formwork integral hoisting platform is constructed synchronously and in parallel on the assembled basis, and the No. 0 block reinforced formwork integral hoisting platform is completed before the construction of the main pier is completed;

A30. Hoist the No. 0 block reinforced formwork and hoist the platform to the top of the main pier as a whole, and carry out the concrete pouring of the No. 0 block main beam and the tension and grouting construction of the beam body.

In the above method, the overall hoisting platform of No. 0 block reinforced formwork includes a frame structure composed of multiple transverse distribution beams and longitudinal distribution beams, and the No. 0 block bottom formwork and left and right Side formwork, step A20 comprises the following steps:

A201. Construct the pier body and No. 0 block support system on the main pier cap of the main pier. The No. 0 block support system is composed of four steel pipe columns arranged around the pier body, connecting systems and attached arms. Each steel pipe The columns are respectively connected with the embedded parts of the attached arm and the pier body, and the two steel pipe columns arranged in the direction of the transverse bridge are connected by a connection system;

A202, synchronously constructing the hoisting platform of the No. 0 block pouring mold on the basis of the assembly, installing the bottom formwork and side formwork on the hoisting platform, and performing the overall binding of steel bars and the installation of prestressed pipelines;

Step A202 is completed earlier than step A201.

In the above method, in step A30, two cranes are used to hoist the overall hoisting platform of the No. 0 reinforced formwork into place in two steps. First, it is hoisted above the top of the pier. The big arm of the crane is locked, and then the hand-pull chains are respectively set on each steel pipe column, and the overall hoisting platform of the No. The overall hoisting platform of the No. 0 steel bar formwork falls in place for measurement, and the elevation and center line are adjusted, and the hook is released after passing the test.

In the above method, in step A10, two rows of at least four assembled foundations are constructed along the bridge direction next to the pier position of the main pier, and the first and second wedges are respectively spot-welded on the top surface of each assembled foundation, The first and second wedges are arranged along the direction of the bridge. Among the two adjacent assembled foundations, the first wedge on the assembled foundation close to the main pier is close to the main pier, and the second wedge is far away from the main pier; The first wedge on the assembled foundation is far away from the main pier, the second wedge is close to the main pier, the height of the first wedge is lower than that of the second wedge, and the slope formed between the two top surfaces is the same as the bottom surface of No. 0 block of the continuous beam The inclination angles are the same, and in step A20, the top surfaces of the first and second wedges are fully welded to the overall hoisting platform of the No. 0 steel bar formwork.

In the above method, there are six assembled foundations, the two adjacent columns are used for assembling the overall hoisting platform of No. 0 block steel formwork, and the other column is used as a spare.

The beneficial effects of the present invention are:

(1) During the construction of the main pier cap and pier body, start to assemble the overall hoisting platform of the No. 0 block steel formwork, install the formwork and bind the steel bars, so as not to conflict with the main body construction of the main pier. The start time of the No. 0 block construction will be shortened construction period;

(2) Realized "changing high altitudes into land" and "changing scattered into a whole". Since the formwork, steel bars, and prestressing work of the continuous beam No. 0 block have been completed on the hoisting platform, after hoisting in place, it can be quickly Pouring concrete, so that the construction period can be compressed to the greatest extent;

(3) The investment of temporary supports is small, which saves costs and improves economic benefits.

Description of drawings

Fig. 1 is the construction site layout diagram before hoisting of No. 0 block reinforced formwork overall hoisting platform in the present invention;

Fig. 2 is the transverse bridge direction view of the present invention in construction;

Fig. 3 is the view along the bridge of the present invention in construction;

Fig. 4 is a schematic diagram of the frame structure of the overall hoisting platform of the No. 0 block steel formwork in the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings. For ease of description, in the following embodiments, the direction along the bridge is used as the front-rear direction, and the direction across the bridge is used as the left and right directions.

The continuous beam No. 0 block rapid construction method provided by the present invention comprises the following steps:

A10. As shown in Figure 1, six assembled foundations 21, 22, 23, 24, 25 and 26 are constructed next to the pier position of the main pier 4. The above six assembled foundations are arranged in two rows along the bridge direction, and each Spot-weld the first and second wedges 51 and 52 respectively on the top surface of the assembled foundation. The first and second wedges 51 and 52 are arranged along the bridge direction. 51 is close to the main pier 4, and the second wedge 52 is away from the main pier 4; the first wedge 51 on the assembled foundation 23, 24 is far away from the main pier 4, and the second wedge 52 is close to the main pier 4, and the height of the first wedge 51 is Lower than the second wedge 52, the slope formed between the top surfaces of the two is the same as the inclination angle of the bottom surface of No. 0 block of the continuous beam.

The two adjacent columns with a total of four assembly foundations are used to assemble the overall hoisting platform of the No. 0 steel bar formwork, and the other column has a total of two assembly foundations as spares. For example, the assembly foundations 21, 22, 23, and 24 are used to assemble No. 0 steel bars Formwork overall hoisting platform, assembly foundation 25, 26 for standby; or assembly foundation 23, 24, 25, 26 is used for assembling the overall hoisting platform of No. 0 steel bar formwork, assembly foundation 21, 22 for standby.

A20. At the same time as the main pier 4 is being constructed, on the basis of the above assembly, the integral hoisting platform of the No. 0 steel formwork is constructed in parallel, and the overall hoisting platform of the No. 0 steel formwork is completed before the construction of the main pier is completed.

As shown in Figure 4, the overall hoisting platform for No. 0 block reinforced formwork includes a frame structure composed of four horizontal distribution beams 9 arranged in parallel and six longitudinal distribution beams 8 arranged in parallel, and a frame structure arranged on the frame structure. The No. 0 block bottom template 13 and the left and right templates 10 (see Fig. 2 and Fig. 3 ), the transverse distribution beam 9 and the longitudinal distribution beam 8 respectively form a stable structure through a plurality of connecting rods 14 .

The detailed steps of step A20 are as follows:

A201. Pour the pier body 41 on the main pier cap 42 of the main pier 4, and at the same time assemble the No. 0 block support system on the main pier cap 42. The No. 0 block support system consists of four steel pipe columns arranged around the pier body 41 2 and the connection system 11 and the attached arm 6, each steel pipe column 2 is respectively connected with the embedded parts on the attached arm 6 and the pier body 41, and the two steel pipe columns 2 arranged in the transverse bridge direction are connected by the connection system 11 connect.

A202. On the basis of assembly, 21, 22, 23, and 24 simultaneously construct the overall hoisting platform of the No. 0 steel bar formwork in parallel. First, a plurality of horizontal distribution beams 9 and longitudinal distribution beams 8 are placed on the first and second wedges 51 and 52. Assembled frame structure, the first and second wedges 51, 52 are fully welded to the transverse distribution beam 9, and then the first and second hoisting beams 15, 16 are respectively welded on the left and right sides of the frame structure, The first and second hoisting beams 15 and 16 are connected by a hoisting beam connection system 17;

Afterwards, install the bottom template 13 and the left and right templates 10 on the frame structure, and carry out integral binding of steel bars and installation of prestressed pipes.

Step A202 should be completed earlier than step A201.

A30. After checking that the overall hoisting platform of the No. 0 steel formwork is qualified, use two large-tonnage cranes 3 to hoist it to the No. 0 support system. Since the first and second wedges 51, 52 are connected to the assembled foundation by spot welding, The overall hoisting platform with the No. 0 steel bar formwork is fully welded, so the first and second wedges 51 and 52 will be separated from the assembly foundation under the pulling action of the crane, and become the overall hoisting platform of the No. 0 steel bar formwork. One rises.

The overall hoisting platform of No. 0 reinforced formwork is hoisted by two cranes in two steps. First, it is hoisted above the top of the pier. When it is 20cm above the design position of the main beam 7, lock the booms of the two cranes, and then The four steel pipe columns 2 are respectively equipped with hand-drawn chains, and the overall hoisting platform of the No. The hoisting platform falls in place for measurement, and the elevation and center line are adjusted, and the hook is loosened after passing the test.

During the whole hoisting process, pay attention to observe the support system of block 0 and the support of the crane legs, especially in the second step of hoisting, it is required to keep the whole process level and keep slow and synchronous, and observe the overall hoisting of the steel formwork of block 0 at all times Read the level on the platform and adjust its level in time.

After the overall hoisting platform of block 0 reinforced formwork is precisely adjusted and positioned, the concrete pouring of the main beam 7 of block 0 and the tension and grouting construction of the beam body of block 0 are carried out.

In the above method, when assembling the No. 0 block support system, the verticality of the steel pipe column 2 should be well controlled and be reliably connected with the pier body attachment arm 6 .

When assembling the overall hoisting platform of the No. 0 steel bar formwork, it should be ensured that the measurement and setting-out are accurate, and the top surfaces of the first and second wedges 51, 52 and the transverse distribution beam 9 are welded firmly.

Of course, the present invention is not limited to the above-mentioned forms, the construction of the assembled foundation, the No. 0 block support system, and the No. 0 block steel formwork overall hoisting platform can be adjusted in due course according to the construction progress of the bridge pier abutment, but the overall hoisting platform of the No. 0 block steel formwork must be ensured. It is completed before the construction of the main pier is completed, so as to minimize the construction period.

The present invention is not limited to the above-mentioned best implementation mode, and anyone should know that any structural changes made under the inspiration of the present invention, and any technical solutions that are identical or similar to the present invention, all fall within the protection scope of the present invention.

Claims (3)

1. No. 0 block rapid construction method of continuous beam, it is characterized in that, comprises the following steps: A10, build the assembled foundation along the bridge direction beside the pier position of the main pier, and the assembled foundation is used to assemble the overall hoisting platform of No. 0 block reinforced formwork; A20. While the main pier is being constructed, the No. 0 block reinforced formwork overall hoisting platform is constructed synchronously and in parallel on the assembled basis, and the No. 0 block reinforced formwork overall hoisting platform includes a plurality of horizontal distribution beams and longitudinal distribution beams. Frame structure and the No. 0 block bottom formwork and left and right side formworks arranged on the frame structure, the pier body and the No. 0 block support system are constructed on the main pier cap of the main pier, and the No. 0 block supports The system consists of four steel pipe columns arranged around the pier body, connecting system and attached arm. Each steel pipe column is connected with the embedded parts of the attached arm and the pier body respectively, and the two steel pipe columns arranged in the transverse bridge direction Connected by a connecting system; on the assembling basis, the hoisting platform of the No. 0 block pouring mold is simultaneously constructed in parallel, and the bottom formwork and the side formwork are installed on the hoisting platform, and the overall binding of steel bars and the installation of prestressed pipes are carried out; and No. 0 The overall hoisting platform of the block reinforced formwork is completed before the construction of the main pier is completed; A30. Hoist the overall hoisting platform of No. 0 steel formwork to the top of the main pier, carry out the concrete pouring of the main beam of No. 0 block and the tension and grouting construction of the beam body. First hoist it to the top of the pier. When it is 20cm above the design position of the main beam, lock the booms of the two cranes, and then set up hand-pull chains on each steel pipe column, and use hand-pail chains to align 0 The overall hoisting platform of the No. 0 steel bar formwork is adjusted in place. When the position between the No. 0 steel bar formwork and the steel pipe column is correct, the overall hoisting platform of the No. 0 steel bar formwork is dropped in place for measurement, and the elevation and center line are adjusted. After passing the hook, loosen the hook. 2. The continuous beam No. 0 block rapid construction method as claimed in claim 1, characterized in that, in step A10, two rows of at least four assembled foundations are constructed along the bridge direction next to the pier position of the main pier, and each Spot-weld the first and second wedges respectively on the top surface of the assembled foundation. The first and second wedges are arranged along the bridge direction. Among the two adjacent assembled foundations, the first wedge on the assembled foundation close to the main pier The block is close to the main pier, and the second wedge is far away from the main pier; the first wedge on the assembled foundation far away from the main pier is far away from the main pier, the second wedge is close to the main pier, and the height of the first wedge is lower than that of the second wedge, The slope formed between the two top surfaces is the same as the inclination angle of the bottom surface of No. 0 block of the continuous beam. In step A20, the top surfaces of the first and second wedges are fully welded and connected to the overall hoisting platform of No. 0 block reinforced formwork. 3. The rapid construction method of No. 0 block of continuous beam as claimed in claim 2, characterized in that, there are six assembled foundations, and the adjacent two columns are used for assembling No. 0 block reinforced formwork overall hoisting platform, and the other column serves as spare.

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