CN1485501A

CN1485501A - Construction method for prefabricating ballast slab of channel beam partitionally

Info

Publication number: CN1485501A
Application number: CNA021371547A
Authority: CN
Inventors: 沈秀芳; 陈文艳; 顾民杰
Original assignee: Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Current assignee: Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Priority date: 2002-09-26
Filing date: 2002-09-26
Publication date: 2004-03-31
Anticipated expiration: 2022-09-26
Also published as: CN1200171C

Abstract

The invention relates to a construction method of channel beam partitioning prefabrication, wherein the main beam and the sectionalized road bed plate are prefabricated, the hoisting die is mounted using the main beam as support, then the prefabricated road bed plate is hoisted in position to the hoisting die, welding the steel bar at the seam crossing portion of the road bed plate, finally casting all the seams in-situ. The advantages of the invention are, it causes little impacts to the city environment and the ground traffic, it can conserve construction cost and shorten the time limit for the project, and the workload of cast-in-situ is low.

Description

The job practices of prefabricating ballast slab of channel beam partitionally

Technical field

The present invention relates to bridge and viaduct build and bridge set up class, particularly a kind of job practices of prefabricating ballast slab of channel beam partitionally.

Background technology

The job practices of the bridge that domestic existing orbit traffic overhead bridge is adopted all is to adopt the cast-in-place on the spot job practices of full framing usually, and the flow process of this method is: A. sets up support on the ground of handling well, makes template then on support; B. assembling reinforcement and bellows on template are installed with prestressing tendon in the bellows; C. water and smash the beam body concrete; Reach certain intensity and after the length of time Deng the beam body concrete, the whole prestressing force of stretch-draw beam body; D. mud jacking sealing off and covering anchorage and striking and template.This job practices has following shortcoming: during (1) construction, whole bridge is all established support from ground in the plane of projection, and is very big to the influence of urban environment and traffic above-ground; (2) ground has enough deadweight of bearing capacity brace summer body and working load under when construction bridge in order to make, and needs before the construction flatten and consolidation process ground under the bridge, increases operating expenses, has delayed construction speed, and if deal with improperly, has easily caused beam body cracking; (3) owing to all adopt field fabrication, be difficult to accomplish standardization, standardization, mechanized construction, be unfavorable for total quality control, the construction period is longer.

Summary of the invention

The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of job practices that is applicable to channel beam is provided, be that girder prefabrication and lifting, road bed board precast block hang the job practices that mould is installed, this job practices does not need from ground support to be set, and does not need ground under the bridge is flattened and consolidation process.

The object of the invention realizes being finished by following technical scheme: a kind of job practices of channel beam is characterized in that: prefabricated girder of A. and piecemeal road bed board; B. main cable and girder is in place; C. be that mould is hung in the support installation with the girder; D. the road bed board lifting of precast block is in place to hanging on the mould; E. weld bed board seam crossing reinforcing bar, the seam crossing bellows is installed, establish cast-in-place all seams of simple and easy template at seam crossing; F. in the entrance path bed board in length and breadth to prestressing tendon, whole residue prestressing tendon in prestressing tendons and the girder in the stretch-draw road bed board; G. the prestressing tendon to stretch-draw carries out the mud jacking sealing off and covering anchorage.

Advantage of the present invention is that (1) hangs the mould form of construction work owing to having adopted, and does not need from ground support to be set, and constructs can not produce considerable influence to urban environment and traffic above-ground; (2) do not need ground under the bridge is flattened and consolidation process, saved unnecessary operating expenses and shortened the duration; (3) on-the-spot cast-in-place workload is little, and it is easy for installation simple to hang mould; (4) be convenient to carry out standardization, standardization, mechanized construction, be easy to control construction quality and duration.

Summary of drawings

Accompanying drawing 1 is a invention process texture edge schematic diagram;

Accompanying drawing 2 is a invention process structure section schematic diagram;

Concrete technical scheme

Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:

Shown in Fig. 1-2, always representing respectively in the accompanying drawing: the suspension ring (6) on prefabricated girder (1), precast block road bed board (2), top rail (3), suspension rod (4), seam (5), the prefabricated road bed board with reference to label 1-6.

Embodiment:

As shown in Figure 1, 2, A. be prefabricated in the factory earlier two girders (1) and several piece road bed board (2), stretch-draw girder (1) interior section or whole prestressing force." A1 " is behind formwork erection, assembling reinforcement and bellows on the factory place, water the railway roadbed board concrete of smashing girder and piecemeal, penetrate prestressing tendon again after finishing Deng casting and compacting of concrete, prestressing tendon in the girder can certainly be penetrated earlier and carry out casting and compacting of concrete in the bellows again; Main beam concretes such as " A2 " reaches certain intensity and after the length of time, whole prestressing force of stretch-draw beam body or partial prestressing; " A3 " carries out the mud jacking sealing off and covering anchorage to the prestressing tendon of stretch-draw.B. girder (1) and be divided into the prefabricated road bed board (2) of several piece and be transported to the scene after, with two girders (1) hoisted in position, and in girder (1) inboard, end two girders (1) are made laterally temporary fixedly of members such as reinforcing bar, angle steel, topple so that two girders (1) are unexpectedly outer.C. be that mould is hung in the support installation with two girders (1), hang mould and comprise top rail (3), suspension rod (4) etc., wherein top rail (3) is supported on the girder (1), and suspension rod (4) upper end is fixing with nut and top rail (3), and the lower end is gone up set suspension ring (6) with road bed board (2) and linked to each other.D. road bed board (2) lifting of several piece precast block is in place to hanging on the mould; E. weld bed board (2) seam (5) and locate reinforcing bar, seam (5) is installed locates bellows, locate to establish cast-in-place all joints of simple and easy template in seam (5).F. in the entrance path bed board (2) in length and breadth to prestressing tendon, locate that concrete reaches certain intensity and after the length of time etc. seam (5), whole residue prestressing tendon in prestressing tendons and the girder (1) in the stretch-draw road bed board (2).G. the prestressing tendon to stretch-draw carries out the mud jacking sealing off and covering anchorage.H. remove and hang mould and the temporary fixed member of girder (1) etc.

Claims

1. the job practices of a prefabricating ballast slab of channel beam partitionally is characterized in that: prefabricated girder of A. and piecemeal road bed board; B. main cable and girder is in place; C. be that mould is hung in the support installation with the girder; D. the road bed board lifting of precast block is in place to hanging on the mould; E. weld bed board seam crossing reinforcing bar, the seam crossing bellows is installed, establish cast-in-place all seams of simple and easy template at seam crossing; F. in the entrance path bed board in length and breadth to prestressing tendon, whole residue prestressing tendon in prestressing tendons and the girder in the stretch-draw road bed board; G. the prestressing tendon to stretch-draw carries out the mud jacking sealing off and covering anchorage.

2. the job practices of a kind of channel beam according to claim 1 is characterized in that the described mould that hangs mainly is made up of top rail, suspension rod.

3. the job practices of a kind of channel beam according to claim 1 and 2 is characterized in that described installation of hanging mould is that top rail is bearing on the girder, and the suspension rod upper end is fixed with nut and top rail.

4. the job practices of a kind of channel beam according to claim 1 and 2, the hoisted in position that it is characterized in that described road bed board are that the lower end with suspension rod links to each other with set suspension ring on the road bed board.