CN112392261A

CN112392261A - Construction method for stably converting support system after slippage of large-span steel roof is completed

Info

Publication number: CN112392261A
Application number: CN202011124834.5A
Authority: CN
Inventors: 黄强; 顾爽爽; 常武光; 余金兵; 黄文华; 朱宝良
Original assignee: MCC Shanghai Steel Structure Technology Co Ltd
Current assignee: MCC Shanghai Steel Structure Technology Co Ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-02-23

Abstract

The invention relates to a construction method for stably converting a support system after the slippage of a large-span steel roof is finished, which comprises the following steps: installing and welding steel brackets, screw jacks and pipe brackets; II, secondly: the jacking core of the screw jack props against the pipe bracket, the sliding shoe and the track under the lower chord are removed, and the limiting base plate is plugged; thirdly, the method comprises the following steps: synchronously falling back the jacking core of each screw jack, descending the truss, contacting the limiting base plate on the pipe bracket, and stopping falling back of the jacking core; fourthly, the method comprises the following steps: and (3) drawing off the steel plate at the top of the limiting base plate, repeating the step three for a plurality of times until the truss falls on the steel pipe concrete column, and designing a supporting system for bearing in the original way: installing a south roof steel structure and a north roof steel structure; sixthly, the method comprises the following steps: and repeating the third step, completely unloading the supporting point force of all the temporary supporting systems, and finishing the integral stable conversion of the supporting systems. According to the invention, the screw jack and the limiting base plate are arranged on the side surface of the steel beam under the track, so that the synchronous falling of each supporting point on the steel beam is realized, and the stable conversion of the steel roof from the temporary supporting system to the originally designed supporting system is realized.

Description

Construction method for stably converting support system after slippage of large-span steel roof is completed

Technical Field

The invention relates to the technical field of civil engineering and steel structure construction, in particular to a construction method for stably converting a support system after the slippage of a large-span steel roof is finished.

Background

The large-scale cultural and tourism project is a large-span truss steel structure roof, and is often not very regular according to building function or architectural effect structure arrangement. The hydraulic synchronous sliding process is a mature construction method for the region with regular structural arrangement, a rail and other structures are required to be arranged as a support system before sliding, and once unloading is carried out after shifting; when the installation position of the irregular main structure is reached, the main structure of the irregular area is installed by adopting a hoisting method, so that the main structure of the roof forms a complete structure system, and then secondary unloading is carried out, and the temporary support system is converted back to the original design support system.

The former design braced system of truss steel roof is peripheral civil engineering structure post + three steel pipe concrete column 5 in the middle of, because of steel roof roofing truss system is super large-span structure, for the whole linear and guarantee that truss 3 does not collide steel pipe concrete column 5 when sliding, need arch camber to truss 3 in advance, but truss lower chord 3.1 still has certain clearance apart from steel pipe concrete column 5 tops after sliding in place.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a construction method for stably converting a supporting system after the slippage of a large-span steel roof is finished.

In order to solve the technical problem, the invention is realized as follows:

a construction method for stably converting a support system after the slippage of a large-span steel roof is finished is characterized by comprising the following steps:

the method comprises the following steps: installing and welding steel brackets on two sides of the rail steel beam, then installing screw jacks on the steel brackets, and arranging pipe brackets below the lower chord of the truss;

step two: the jacking core of the screw jack props against the pipe bracket, then the sliding shoe and the track under the lower chord are removed, a plurality of 10mm steel plates are plugged in the sliding shoe and the track to serve as limit base plates of unloading travel, and the limit base plates of the unloading travel are preferably about 10mm away from the pipe bracket;

step three: the jacking core of each point screw jack synchronously and slowly falls back, the truss also falls along with the screw jack, and the jacking core stops falling back when the pipe bracket contacts the limiting base plate;

step four: checking a gap between the top of the steel pipe concrete column and the truss, pulling off a steel plate at the top of the limiting base plate, repeating the step 3 for multiple times until the truss falls on the steel pipe concrete column, finishing the conversion work of the support system in the first stage, starting bearing by the originally designed support system, and not unloading the supporting point force of the temporary support system;

step five: then installing a south side roof steel structure in the initial sliding area and arranging an irregularly north side roof steel structure to finish the installation of the whole roof steel structure;

step six: and continuing repeating the step 3 until the supporting point force of all the temporary supporting systems is completely unloaded, and at the moment, completely bearing the force of the originally designed supporting system to finish the integral stable conversion of the supporting system.

The invention has the beneficial effects that: the steel roof is stably placed on the originally designed supporting system by arranging the screw jacks and the limiting base plates for two-time grading synchronous unloading, the temporary supporting force is gradually unloaded, the supporting system is stably and transitionally completed, the safety risk is reduced, and the construction efficiency is enhanced.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

FIG. 1 is a view showing nodes above an axle track and nodes on top of a steel pipe concrete column of the shaft 1;

FIG. 2 is a view showing nodes above the axle track and nodes on top of the steel pipe concrete column of the shaft 2;

FIG. 3 is a view showing nodes above the axle track and nodes on top of the steel pipe concrete column of the shaft III and III;

FIG. 4 is a view showing nodes above the axle track and nodes on top of the steel pipe concrete column of the shaft 4;

FIG. 5 is a view showing nodes above the axle track and nodes on top of the steel pipe concrete column of the shaft III and III;

FIG. 6 is a view showing nodes above the axle track and nodes on top of the steel pipe concrete column of the shaft 6;

FIG. 7 is a view showing nodes above the axle track and nodes on top of the steel pipe concrete column of the shaft 7;

FIG. 8 is a view showing nodes above the axle track and nodes 8 on top of the steel pipe concrete column of the shaft;

FIG. 9 is a schematic plan view of an alternative area mounting;

FIG. 10 is the node above the axle track and the node on top of the steel pipe concrete column.

Detailed Description

As shown in fig. 1: a construction method for stably converting a support system after the slippage of a large-span steel roof is finished, the slippage is finished, and the gap between the tops of 5 steel pipe concrete columns is 80 mm;

as shown in fig. 2: the method comprises the following steps: installing and welding steel brackets 1.1 on two sides of a track steel beam 1, then installing screw jacks 2 on the steel brackets 1.1, and arranging pipe brackets 3.2 under lower chords 3.1 of a truss 3;

as shown in fig. 3 and 4: step two: a jacking core 2.1 of the screw jack 2 jacks a pipe bracket 3.2, then a sliding shoe 3.3 and a track 3.4 under a lower chord 3.1 are removed, a plurality of 10mm steel plates are plugged in to serve as a limit cushion plate 4 of an unloading stroke, and the limit cushion plate 4 of the unloading stroke is about 10mm away from the pipe bracket 3.2;

as shown in fig. 5: step three: the top cores 2.1 of the screw jacks 2 of each point synchronously and slowly fall back, the truss 3 also falls along with the top cores, when the pipe bracket 3.2 contacts the limiting base plate 4, the top cores 2.1 stop falling back, and the top clearance of the steel pipe concrete column is changed into 70 mm;

as shown in fig. 6: step four: checking a gap between the top of the steel pipe concrete column 5 and the truss 3, and drawing off a steel plate at the top of the limiting base plate 4 to ensure that the gap between the limiting base plate 4 and the pipe bracket 3.2 is changed into 10mm again;

as shown in fig. 7: the screw jack falls back, the pipe bracket stops falling when contacting the limiting base plate, and the top clearance of the steel pipe concrete column is changed to 60 mm;

as shown in fig. 8: step four: repeating the third step for many times until the truss falls on the steel pipe concrete column, finishing the conversion work of the support system in the first stage at the moment, starting bearing by the originally designed support system, and not unloading the supporting point force of the temporary support system;

as shown in fig. 9 and 10: step five: then installing a south roof steel structure 6 in the initial sliding area and arranging an irregularly north roof steel structure 7 to finish the installation of the whole roof steel structure;

Claims

1. A construction method for stably converting a support system after the slippage of a large-span steel roof is finished is characterized by comprising the following steps:

the method comprises the following steps: the method comprises the following steps that welding steel brackets (1.1) are installed on two sides of a track steel beam (1), then a screw jack (2) is installed on each steel bracket (1.1), and a pipe bracket (3.2) is arranged below a lower chord (3.1) of a truss (3);

step two: a jacking core (2.1) of the screw jack (2) jacks the pipe bracket (3.2), then a sliding shoe (3.3) and a track (3.4) under the lower chord (3.1) are removed, a plurality of 10mm steel plates are plugged in to serve as limiting base plates (4) of unloading strokes, and the unloading stroke limiting base plates (4) are about 10mm away from the pipe bracket (3.2);

step three: the top core (2.1) of each point screw jack (2) synchronously and slowly falls back, at the moment, the truss (3) also falls, and when the pipe bracket (3.2) contacts the limiting base plate (4), the top core (2.1) stops falling back;

step four: checking a gap between the top of the steel pipe concrete column (5) and the truss (3), drawing off a steel plate at the top of the limiting base plate (4), and repeating the step (3) for multiple times until the truss falls on the steel pipe concrete column, finishing the conversion work of the support system in the first stage, wherein the originally designed support system starts bearing force, and the support point force of the temporary support system is not unloaded;

step five: then installing a south roof steel structure (6) in the initial sliding area and a north roof steel structure (7) with irregular arrangement to finish the installation of the whole roof steel structure;