CN101666122B

CN101666122B - Construction method of micro distance air crossbeam bottom board

Info

Publication number: CN101666122B
Application number: CN2009100579189A
Authority: CN
Inventors: 曹培峰; 王巍; 谷志旺
Original assignee: Shanghai City No4 Building Co Ltd
Current assignee: Shanghai Construction No 4 Group Co Ltd
Priority date: 2009-09-18
Filing date: 2009-09-18
Publication date: 2011-05-25
Anticipated expiration: 2029-09-18
Also published as: CN101666122A

Abstract

The invention relates to a construction method of a micro distance air crossbeam bottom board, which comprises the following steps: setting out on a top plate of a basement of a subway station, marking a plane position of supporting and changing a crossbeam; bricking at two sides of the crossbeam, and enabling the side edge line of the crossbeam to coincide with the center line of bricks, wherein the bricking height is 19 cm; filling sand into brick walls at two sides and punning, enabling the sand level to be level with the brick wall; laying waterproof coiled materials on the brick walls at two sides and the filled sand, wherein the waterproof coiled materials are used for preventing concrete sludge flowing into the filled sand to cause the filled sand concretion; setting out on the waterproof coiled materials again, laying a five-layer plywood crossbeam bottom board; lapping a crossbeam side board; binding steel bars, laying a prestress rib, pouring concrete; after the maintenance period is ended, applying prestress to the crossbeam, dismantling the crossbeam side board; knocking the bricks at two sides of the crossbeam bottom off, dispelling the filled sand by using high-pressure current, and dismantling the bottom board. The invention replaces wood to complete the construction of the crossbeam bottom board by fully utilizing the characteristic that the sand can bear after being punned and can be dispersive when being subjected to water impaction, and successfully solves the difficulty of dismantling the crossbeam bottom board in a micro distance way.

Description

Construction method of micro distance air crossbeam bottom board

Technical field

The present invention relates to a kind of Construction Method of Metro Station, relate in particular to a kind of need and build the multilayer office occupancy in the top AT STATION, do not influence the subway station again, and carry out the method for conversion beam construction.

Background technology

Conventional Construction Method of Metro Station is at the direct earthing in basement top, becomes green land or road, to avoid the differential settlement of subway station.For making full use of the soil, according to the design planning requirement, the multilayer office occupancy is built in the top AT STATION in the metropolis.In order not influence the subway station, must carry out the vertical load conversion, promptly carry out the conversion beam construction.In this project, promptly smash the construction of super large conversion beam at subway station top board top-pour, maximum beam section is of a size of 2000 * 2400mm.Need to have certain distance (19cm) after this beam construction is finished, make the subway station basement roof not bear upper load, guarantee structural safety with basement roof.This kind construction, a maximum difficult problem is newly to water the construction problem of beam bottom board.Under this situation,, promptly on basement roof, set up flitch and lay template if adopt conventional beam bottom board construction, concrete beam water smash finish after, bed die then can't be removed, thus the function of forfeiture conversion beam shunting bearing capacity.

Summary of the invention

The present invention will provide a kind of construction method of micro distance air crossbeam bottom board, is used to solve the constructing technology problem that newly waters beam bottom board that the subway station basement roof does not bear upper load.

For achieving the above object, technical scheme of the present invention is as follows:

A kind of construction method of micro distance air crossbeam bottom board, concrete steps are as follows:

1. unwrapping wire on the basement roof of subway station marks the plan-position that underpins beam;

2. according to the unwrapping wire result,, be 19cm highly, and make beam side line and lay bricks central lines in two brick on edge of beam;

3. with back-up sand in two brick-on-edge walls, compacting makes the sand absolute altitude flush with brick wall;

4. on back-up sand and two brick-on-edge walls, lay the waterproof coiled material, be used for preventing that concrete slurry from flowing into back-up sand, cause that back-up sand is fixed;

5. unwrapping wire again on waterproof roll is laid the five-layer plywood beam bottom board;

6. set up beam side according to the beam absolute altitude;

7. assembling reinforcement is laid presstressed reinforcing steel, disturbing concrete;

8. after the maintenance expiration, beam is applied prestressing force, remove beam side;

9. knock out two brick on edge at the bottom of the beam, utilize High-Pressure Water that back-up sand is broken up, remove bed die.

In above-mentioned 6 steps: set up the side form of beam with five-layer plywood side template 7 and little wood stupefied 6, it is 48 steel pipe 8 that diameter is erect in the side form both sides, uses drawing reinforcing bar 9 to pass behind the side form fixing between the both sides steel pipe 8.

The invention has the beneficial effects as follows:

The then loose characteristic of water slug can be carried, be met to the present invention after making full use of the sand compacting, and alternative flitch is finished big beam bottom board construction, successfully solved the difficult problem that the big beam bottom board of distance element is removed, and construction effect is remarkable.This invention is once successful technological innovation, has augmented existing crossbeam mold method perfect, can effectively solve the construction difficult problem that multistory building is built on top, subway station, obvious social benefit.

Description of drawings

Fig. 1 is the generalized section of micro distance air crossbeam bottom board of the present invention.

The specific embodiment

The present invention is further illustrated below in conjunction with accompanying drawing and embodiment.

As shown in Figure 1, the execute-in-place process of construction method of micro distance air crossbeam bottom board of the present invention:

(1) unwrapping wire on subway station basement roof 1 marks the plan-position that underpins beam;

(2) according to the unwrapping wire result, in two brick on edge 3 of beam 10, highly be 19cm (removing wooden bed die thickness to the discrepancy in elevation of top board at the bottom of being beam), guarantee beam 10 side lines and lay bricks 3 central lines;

(3) with back-up sand 2 in two brick-on-edge walls, compacting makes sand 2 absolute altitudes flush with brick wall;

(4) on back-up sand 2 and two brick-on-edge walls, lay waterproof coiled material 4, prevent that concrete slurry from flowing in the back-up sand, causes that back-up sand is fixed;

(5) unwrapping wire again on waterproof roll 4 is laid five-layer plywood beam bottom board 5;

(6) set up the side form of beam according to the beam absolute altitude with five-layer plywood side template 7 and little wood stupefied 6, it is 48 steel pipe 8 that diameter is erect in the side form both sides, uses between the both sides steel pipe 8 drawing reinforcing bar 9 to pass fixing (identical with the normal concrete beams construction) behind the side form;

(7) assembling reinforcement is laid presstressed reinforcing steel, disturbing concrete;

(8) after the maintenance expiration, beam 10 is applied prestressing force, remove beam side;

(9) carefully knock out beam 10 ends two brick on edge 3, utilize High-Pressure Water that back-up sand 2 is broken up, finish the dismounting work of bed die.

Claims

1. construction method of micro distance air crossbeam bottom board, it is characterized in that: concrete steps are as follows:

1) goes up unwrapping wire at subway station basement roof (1), mark the plan-position that underpins beam;

2), in two brick on edge (3) of beam (10), be 19cm highly, and make beam (10) side line and lay bricks (3) central lines according to the unwrapping wire result;

3) with back-up sand in two brick-on-edge walls (2), compacting makes the sand absolute altitude flush with brick wall;

4) on back-up sand (2) and two brick-on-edge walls, lay waterproof coiled material (4), be used for preventing that concrete slurry from flowing into back-up sand (2), cause that back-up sand (2) is fixed;

5) unwrapping wire again on waterproof roll (4) is laid five-layer plywood beam bottom board (5);

6) set up beam side according to beam (10) absolute altitude;

7) assembling reinforcement is laid presstressed reinforcing steel, disturbing concrete;

8) after the maintenance expiration, beam is applied prestressing force, remove beam side;

9) knock out beam (10) ends two brick on edge (3), utilize High-Pressure Water that back-up sand (2) is broken up, remove bed die.