CN103866698A

CN103866698A - Symmetrical suspension splicing bridge support seat end pseudo-suspension splicing construction method

Info

Publication number: CN103866698A
Application number: CN201410094947.3A
Authority: CN
Inventors: 王鹏; 李小红; 崔力波; 杨兵; 张旭东; 唐达昆; 胡小银; 杨滢涛
Original assignee: China Railway 11th Bureau Group Co Ltd
Current assignee: China Railway 11th Bureau Group Hanjiang Heavy Industry Co., Ltd; China Railway 11th Bureau Group Co Ltd
Priority date: 2014-03-14
Filing date: 2014-03-14
Publication date: 2014-06-18
Anticipated expiration: 2034-03-14
Also published as: CN103866698B

Abstract

The invention provides a symmetrical suspension splicing bridge support seat end pseudo-suspension splicing construction method. The method aims at a convex support seat end construction pseudo-suspension splicing structure. Two support seat section end beams are subjected to opposite pulling and prestress by temporary prestress beams and temporary prestress rebars, so the certain number of section beams arranged at two sides and corresponding to respective suspension splicing structures are born. As the temporary prestress structures are adopted to transmit the internal forces such as bending moment and pressure in the cantilever splicing to a cover beam, the possibility of the support seat end cantilever construction is realized; after the pseudo-suspension splicing structure is constructed, common suspension beams can be sequentially spliced according to the cantilever splicing method, the effect of a support method is reduced without the support turnover time and the influence on the lower transportation is reduced.

Description

The false cantilever construction method of symmetrical cantilever bridge pad end

Technical field

The present invention relates to technical field of bridge construction, specifically the false cantilever construction method of a kind of symmetrical cantilever bridge pad end.

Background technology

Bridge subsection prefabricated construction has that occupied ground is few, speed of application is fast, precision is high, quality is easily controlled, and reduces the advantages such as on-the-spot adjustment time, and particularly in urban congestion area, its componentization, batch production feature obtain best embodiment.Beam sections is carried out the assembled mode that can adopt the assembled and symmetrical free cantilever erection in whole hole, and wherein symmetrical cantilever is because each lifting sections quantity is few, and Bridge Erector is relatively simple, and therefore symmetrical cantilever is a kind of preferably in section assembling method.

For multi-joint bridge, can not be stressed at Cheng Qiaoqian bearing, particularly, for convex bearing end (as shown in Figure 1), while carrying out symmetrical cantilever, lack consolidation condition at bearing end, the general Support Methods that adopt first by assembled good half bridge beam more.But this method is taken up an area large, larger to bottom traffic impact, and high-altitude risk is high, constructs consuming time.For this reason, the present invention is directed to this convex bearing and adopt a kind of false cantilever construction method.

Summary of the invention

The invention provides the false cantilever construction method of a kind of symmetrical cantilever bridge pad end, it builds false cantilever structure for convex bearing end, general beam sections can be carried out according to cantilever assembling method assembled successively, reduce the impact of Support Method, there is no the support turnaround time, reduced the impact of construction on bottom traffic.

The false cantilever construction method of a kind of symmetrical cantilever bridge pad end, comprises the steps:

Step 1, two bearing beam sections are lifted to the bent cap with convex bearing end, be arranged on pier stud with the bent cap of convex bearing end, between the bent cap with convex bearing end and bearing beam sections, temporary support is installed;

Step 2, at bearing beam sections and the bent cap with convex bearing end embodiment in which top gasket and bottom gasket be installed respectively between two sides up and down;

Step 3, at the top of the bent cap with convex bearing end and bearing beam sections, interim prestressing tendon is installed, interim prestressed reinforcement is installed in bottom, and carry out stretch-draw, by bearing beam sections and being consolidated with the bent cap of convex bearing end, form false cantilever by interim prestressing tendon, interim prestressed reinforcement, embodiment in which top gasket and bottom gasket;

Step 4, common beam sections, according to general cantilever assembling method, are constructed on described false cantilever, fix the common beam sections of first by the permanent prestressing tendon of stretch-draw beam sections top board;

After the interim prestressed reinforcement of step 5, dismounting base plate, other common beam sections (4) are installed and stretch-draw beam sections top board bundle successively;

Step 6, boom segments all set up after complete and closure, and the interim prestressing tendon of beam sections top board cuts off one by one;

Step 7, remove embodiment in which top gasket, bottom gasket and temporary support, permanent bearing is installed, complete system conversion.

The false cantilever construction method of symmetrical cantilever bridge pad end as above, the interim prestressed reinforcement of described base plate is removed and is carried out after step 3 forms false cantilever or after the common segment installation of first.

The false cantilever construction method of symmetrical cantilever bridge pad end as above, embodiment in which top gasket and bottom gasket are the concrete block of (300-500mm) * (800-1300mm).

The false cantilever construction method of symmetrical cantilever bridge pad end as above, interim prestressed reinforcement adopts Φ 32mm and above reinforcing bar, at least one of every side.

The present invention is undertaken two bearing beam sections to drawing and apply prestressing force by interim prestressing tendon and interim prestressed reinforcement, thereby bears the both sides beam sections quantity corresponding with symmetrical cantilever separately.Owing to having adopted interim prestressed structure that the internal force such as moment of flexure, pressure of free cantilever erection is delivered on bent cap, realize bearing end cantilever construction possibility; Built after false cantilever structure, general beam sections can be carried out according to cantilever assembling method assembled successively, has reduced the impact of Support Method, there is no the support turnaround time, has reduced the impact on bottom traffic.

Accompanying drawing explanation

Fig. 1 is the structural representation of the bridge with convex bearing end;

Fig. 2 is the schematic diagram of the false cantilever construction method of the symmetrical cantilever bridge pad of the present invention end construction sequence one;

Fig. 3 is the schematic diagram of the false cantilever construction method of the symmetrical cantilever bridge pad of the present invention end construction sequence two;

Fig. 4 is the schematic diagram of the false cantilever construction method of the symmetrical cantilever bridge pad of the present invention end construction sequence three;

Fig. 5 is the schematic diagram of the false cantilever construction method of the symmetrical cantilever bridge pad of the present invention end construction sequence four;

Fig. 6 is the profile of the false cantilever that builds in construction method of the present invention.

In figure: 1-pier stud, 2-bent cap with convex bearing end, 3-bearing beam sections, 4-common beam sections, 5-temporary support, 6-embodiment in which top gasket, 7-bottom gasket, 8-interim prestressing tendon, 9-interim prestressed reinforcement.

The specific embodiment

Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is clearly and completely described.

Please refer to Fig. 2-5, the false cantilever construction method of the symmetrical cantilever bridge pad of the present invention end comprises the steps:

Step 1, two bearing beam sections 3 are lifted to the bent cap 2 with convex bearing end with crane, Bridge Erector or other equipment, the described bent cap 2 with convex bearing end is arranged on pier stud 1.Between bent cap 2 with convex bearing end and bearing beam sections 3, temporary support 5 is installed, in order to bear vertical force and to adjust bearing beam sections 3 and the position of common beam sections 4 (as shown in Figure 2).

Step 2, embodiment in which top gasket 6 and bottom gasket 7(are installed respectively up and down as shown in Figure 3 between two sides at bearing beam sections 3 and the bent cap 2 with convex bearing end), in order to transmit moment of flexure and to adjust bearing beam sections 3 and common beam sections 4 linear.

Step 3, at the top of the bent cap 2 with convex bearing end and bearing beam sections 3, interim prestressing tendon 8 is installed, interim prestressed reinforcement 9 is installed in bottom, and carry out stretch-draw, by bearing beam sections 3 be consolidated with the bent cap 2 of convex bearing end, form false cantilever by interim prestressing tendon 8, interim prestressed reinforcement 9, embodiment in which top gasket 6 and bottom gasket 7, thereby all cross sections power is transmitted to (as shown in Figure 4) by false cantilever.

Interim prestressing tendon 8 can be adjusted according to the weight of boom segments, general at least one side 7 holes, every hole at least 5 bundles.

Interim prestressed reinforcement 9, for guaranteeing that bottom does not occur that pulling force provides enough large precompression, generally at least adopts Φ 32mm and above reinforcing bar, at least one of every side.

The size of embodiment in which top gasket 6 and bottom gasket 7 can be adjusted according to stressed result, generally can be made into the concrete block of (300-500mm) * (800-1300mm), concrete strength should, than the high intensity of beam body intensity, can strengthen bearing capacity by arrangement of reinforcement in the time of stressed increase.

Step 4, common beam sections 4, according to general cantilever assembling method, are constructed on described false cantilever, and by interim prestressing tendon 8, the fixing common beam sections 4(of first is boom segments), as shown in Figure 5.The length of common beam sections 4 is 2-3.5m, generally has 4-7 common beam sections 4.

Step 5, after step 3 forms false cantilever or the interim prestressed reinforcement 9 of the assembled rear dismounting base plate of the common beam sections 4 of first, other common beam sections 4 are installed and stretch-draw beam sections top board bundle successively, as long as the deadweight of opposing bridge subsection.

Step 6, boom segments all set up after complete and closure, and the interim prestressing tendon 8 of beam sections top board cuts off one by one, and now false cantilever lost efficacy, and load transmits by bearing beam sections 3.

Step 7, remove embodiment in which top gasket 6, bottom gasket 7 and temporary support 5, permanent bearing is installed, complete system conversion.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any belong to those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims

1. the false cantilever construction method of symmetrical cantilever bridge pad end, is characterized in that comprising the steps:

Step 1, two bearing beam sections (3) are lifted to the bent cap with convex bearing end (2), it is upper that bent cap (2) with convex bearing end is arranged on pier stud (1), between the bent cap (2) with convex bearing end and bearing beam sections (3), temporary support (5) is installed;

Step 2, at bearing beam sections (3) and the bent cap with convex bearing end (2) embodiment in which top gasket (6) and bottom gasket (7) be installed respectively between two sides up and down;

Step 3, at the top of the bent cap with convex bearing end (2) and bearing beam sections (3), interim prestressing tendon (8) is installed, interim prestressed reinforcement (9) is installed in bottom, and carry out stretch-draw, bearing beam sections (3) and the bent cap with convex bearing end (2) are consolidated, form false cantilever by interim prestressing tendon (8), interim prestressed reinforcement (9), embodiment in which top gasket (6) and bottom gasket (7);

Step 4, common beam sections (4), according to general cantilever assembling method, are constructed on described false cantilever, fix the common beam sections of first (4) by the permanent prestressing tendon of stretch-draw beam sections top board;

After the interim prestressed reinforcement (9) of step 5, dismounting base plate, other common beam sections (4) are installed and stretch-draw beam sections top board bundle successively;

Step 6, boom segments all set up after complete and closure, and the interim prestressing tendon (8) of beam sections top board cuts off one by one;

Step 7, remove embodiment in which top gasket (6), bottom gasket (7) and temporary support (5), permanent bearing is installed, complete system conversion.

2. the false cantilever construction method of symmetrical cantilever bridge pad end as claimed in claim 1, is characterized in that: the interim prestressed reinforcement (9) of described base plate is removed after step 3 forms false cantilever or the common beam sections of first (4) is carried out after assembled.

3. the false cantilever construction method of symmetrical cantilever bridge pad end as claimed in claim 1, is characterized in that: embodiment in which top gasket (6) and bottom gasket (7) are the concrete block of (300-500mm) * (800-1300mm).

4. the false cantilever construction method of symmetrical cantilever bridge pad end as claimed in claim 1, is characterized in that: interim prestressed reinforcement (9) adopts Φ 32mm and above reinforcing bar, at least one of every side.