CN111749135A

CN111749135A - Integral dismantling method for 0# block bracket of continuous rigid frame bridge

Info

Publication number: CN111749135A
Application number: CN202010480924.1A
Authority: CN
Inventors: 李志文; 陈松洲
Original assignee: Road and Bridge International Co Ltd; China Communication South Road and Bridge Co Ltd
Current assignee: Road and Bridge International Co Ltd; China Communication South Road and Bridge Co Ltd
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2020-10-09

Abstract

The invention relates to a method for integrally removing a No. 0 bracket of a continuous rigid frame bridge, wherein when the No. 0 bracket is installed, two shoulder pole beams are welded at the bottom of a bearing beam on the upper layer of the bracket, and two ends of each shoulder pole beam are welded with lifting lugs; when 0# concrete is poured, respectively embedding vertical sleeves at positions of 4 lifting lugs right facing the shoulder pole beam as lifting rope through holes; after the 0# block is poured, a guide wheel and a winch are arranged on the top surface of the 0# block close to each lifting rope through hole, and a lifting rope of the winch bypasses the guide wheel and penetrates through the lifting rope through hole to be connected with a lifting lug of the shoulder pole beam; when the support is dismantled, the upper bearing beam is lifted away from the unloading device, and then the unloading device is taken down; the upper layer bearing beam is lowered to the lower layer bearing beam and is temporarily welded; lifting the bracket integrally upwards, removing the bracket and finally dropping the bracket integrally to the ground. Convenient operation, safety, high efficiency have solved the problem of inefficiency, security difference when present 0# piece bracket is demolishd.

Description

Integral dismantling method for 0# block bracket of continuous rigid frame bridge

Technical Field

The invention relates to the technical field of bridge construction, in particular to a method for integrally removing a No. 0 block bracket of a continuous rigid frame bridge.

Background

Continuous rigid frame bridge is because the pier is high, 0# piece often adopts non-console mode support to be under construction, pre-buried shaped steel is used for installing the bracket when pier shaft construction, when the support was set up, set up lower floor's spandrel girder on the bracket, installation sand section of thick bamboo or wedge unload device such as piece that falls on the spandrel girder of lower floor, it sets up upper spandrel girder to unload to fall on the device, set up the distribution roof beam on the spandrel girder of upper strata, the template is pour to installation 0# piece on the distribution roof beam for the load of upper portion cast in situ concrete passes through the support and all transmits the pier shaft. The method is more suitable for high pier bridge construction, the using amount of support materials can be reduced, the cost is reduced, but in the later stage of support removal, because the support is arranged at the bottom of the No. 0 block, the support cannot be vertically lifted for removal, the support members can be pulled out one by one from the lower part of the No. 0 block only by adopting a dragging method, the efficiency is low, and great safety risks exist in high-altitude operation.

Disclosure of Invention

Aiming at the difficulty in dismantling the 0# block bracket of the continuous rigid frame bridge at present, the invention provides the 0# block bracket overall dismantling method which is convenient to operate and high in safety by comprehensively considering the load of the bracket according to the structural characteristics of the 0# block, so that the construction efficiency is improved, and the construction risk is reduced.

The technical scheme of the invention is as follows:

the integral dismantling method for the No. 0 block bracket of the continuous rigid frame bridge is characterized by comprising the following steps of:

(1) when the No. 0 bracket is installed, two shoulder pole beams perpendicular to the upper bearing beam are symmetrically welded at the bottom of the upper bearing beam of the bracket, and two lifting lugs are welded at two ends of each shoulder pole beam;

(2) when 0# block concrete is poured, respectively embedding sleeves which vertically penetrate through the 0# block in positions, which are opposite to 4 lifting lugs of the shoulder pole beam, in the concrete to serve as lifting rope through holes;

(3) after the concrete of the No. 0 block is poured, a guide wheel is fixedly arranged on one side of each lifting rope through hole on the top surface of the No. 0 block, a winch is arranged corresponding to each guide wheel and is temporarily fixed, one end of a lifting rope is connected with the winch, and the other end of the lifting rope bypasses the guide wheels and penetrates through the lifting rope through holes to be connected with lifting lugs of the shoulder pole beams;

(4) when the support is detached, firstly, the unloading device supporting the upper bearing beam is lowered to lower the height of the top of the bracket, then the winch is started to upwards tighten the lifting rope, the upper bearing beam of the bracket is lifted away from the unloading device through the shoulder pole beam, and then the unloading device is taken down;

(5) the hoisting machine loosens the lifting rope downwards, the upper layer bearing beam is lowered to the lower layer bearing beam of the bracket, and the upper layer bearing beam and the lower layer bearing beam are temporarily welded;

(6) the hoisting machine upwards tightens the lifting rope again, the bracket is integrally lifted upwards, the lower-layer bearing beam is lifted away from the bracket, and then the bracket and the bracket installation embedded part on the pier body are removed;

(7) and the hoisting machine releases the lifting rope downwards again, and the bracket is integrally dropped to the ground to finish the dismounting of the bracket of the No. 0 block.

The invention adopts the winch as a power device, connects the shoulder pole beam through the lifting rope, integrally drops the support, has simple structure, convenient operation, high construction efficiency and good safety, and solves the problems of low efficiency and poor safety when the 0# bracket is dismantled at present.

Drawings

FIG. 1 is a schematic structural view of a bracket integral-dismantling device;

fig. 2 is a schematic view showing a state where the sand cylinder is removed after the carrying pole beam is lifted;

FIG. 3 is a schematic view showing a state where the upper bearing beam falls onto the lower bearing beam after the sand cylinder is removed;

FIG. 4 is a schematic view showing a state where the bracket is lifted integrally to remove the support bracket;

fig. 5 is a schematic view showing a state where the carriage is lowered as a whole.

Detailed Description

The specific embodiment of the invention is as follows:

(1) as shown in fig. 1, the structure of the 0# block bracket generally comprises a lower-layer spandrel girder 1, an unloading device 2, an upper-layer spandrel girder 3 and a distribution girder 4, wherein the lower-layer spandrel girder 1 is supported on a bracket 5 fixed on a pier body along the bridge direction, and the bracket 5 is installed and fixed through an embedded part embedded in the pier body 6; the top surface of the lower bearing beam 1 is provided with a discharging device 2, the discharging device is generally a sand cylinder or a wedge-shaped discharging block and is used for adjusting the elevation of the support during support installation and reducing the height of the support during form removal and support removal; the upper bearing beam 3 is supported on the unloading device 2 in the transverse bridge direction, the distribution beam 4 is erected on the upper bearing beam 3, and the 0# block pouring template is installed on the distribution beam 4.

When the No. 0 bracket is installed, two shoulder pole beams 6 vertical to the upper bearing beam are symmetrically welded at the bottom of the upper bearing beam 3 of the bracket along the bridge direction in advance, and two lifting lugs are welded at two ends of each shoulder pole beam 6.

When the 0# block concrete 11 is poured, sleeves which vertically penetrate through the 0# block are respectively embedded in the concrete at positions right opposite to 4 lifting lugs of the carrying pole beam to serve as lifting rope through holes 7.

After the concrete pouring of the No. 0 block is completed, a guide wheel 8 is fixedly installed on one side, close to each lifting rope through hole 7, of the top surface of the No. 0 block, a winch 9 is installed corresponding to each guide wheel 8 and is temporarily fixed, one end of a lifting rope 10 is connected with the winch and wound on the winch, and the other end of the lifting rope 10 is wound around the guide wheel 8 and penetrates through the lifting rope through hole 7 to be connected with a lifting lug of the carrying pole beam 6.

(2) As shown in fig. 2, when the support is removed, the unloading device for supporting the upper layer bearing beam 3 is lowered to lower the height of the top of the bracket, then the winch 9 is started to tighten the lifting rope 10 upwards, the upper layer bearing beam 3 of the bracket is lifted upwards by a certain height through the shoulder pole beam 6, and the unloading device is lifted off and taken down;

(3) as shown in fig. 3, the hoist 9 releases the lifting rope 10 downward, the upper-layer spandrel girder 3 is lowered onto the lower-layer spandrel girder 1, and the upper-layer spandrel girder 3 and the lower-layer spandrel girder 1 are temporarily welded;

(4) as shown in fig. 4, the hoisting machine 9 again tightens the lifting rope 10 upwards, lifts the bracket upwards as a whole, lifts the lower-layer spandrel girder 1 away from the corbel 5, and then removes the corbel 5 and the corbel installation embedded part on the pier body;

(5) as shown in fig. 5, the hoist 9 again releases the hoist rope 10 downward to drop the entire bracket to the ground, thereby completing the removal of the # 0 bracket.

Claims

1. The integral dismantling method for the No. 0 block bracket of the continuous rigid frame bridge is characterized by comprising the following steps of: