CN105088979A - Demolition blasting method for large bridge - Google Patents

Abstract

The invention relates to a demolition method for a bridge, in particular to a demolition blasting method for a large bridge, and belongs to the technical field of bridge engineering application. The method comprises the following steps that firstly, an opening is formed in a bridge floor; secondly, a crawling ladder is erected; thirdly, a scaffold is erected; fourthly, a hanging basket is arranged; fifthly, a corridor and rails are erected; sixthly, drilling and powder charging are carried out; seventhly, demolition blasting is carried out; eighthly, detached objects are treated. The method has the advantages of being small in workload, high in efficiency, safe, reliable and the like.

Description

A kind of large bridge blasting demolishing method

Technical field

The present invention relates to a kind of bridging toughening method, particularly relate to a kind of large bridge blasting demolishing method, belong to bridge engineering applied technical field.

Background technology

As everyone knows, contrary with newly building bridge on the principle of temporal sequence removing bridge, i.e. bridge floor accessory structure → basic unit's concrete and bridge deck pavement → column bridge deck → spandrel column → arch rib → abutment and attached → dismounting thing process.Current bridging toughening usually adopts manually directly to remove or set up support and removes, and no matter adopt which kind of mode above-mentioned to remove, it all exists the shortcomings such as workload is large, efficiency is low, danger is high.Especially large bridge, dismounting need be carried out in the air at height, if adopt artificial directly dismounting, its operation easier is larger, and danger is higher.

Summary of the invention

In order to overcome above technical problem, the object of the present invention is to provide a kind of high efficiency, safe and reliable large bridge blasting demolishing method.

The present invention is achieved through the following technical solutions: a kind of large bridge blasting demolishing method, comprises the following steps:

The first, bridge floor opening: the bridge floor above bridge pier or column breaks bridge floor and form the opening passed through for personnel, equipment;

The second, set up cat ladder: set up cat ladder at bridge floor opening part, facilitate the current of personnel and equipment;

Three, set up scaffold: bridge pier place sets up scaffold by land, for personnel up and down, handling equipment, borehole charge, installation protection, lay corridor;

Four, arrange hanging basket: above bridge floor opening part, arrange hanging basket, hanging basket adopts elevator lifting, convenient from bridge floor opening part shipment personnel, equipment, carries out that brill is quick-fried, construction of prevention work;

Five, set up corridor, railing: set up corridor at the arch rib place of bridge, facilitate the current and equipment carrying of workman, set up railing on both sides, corridor;

Six, boring, powder charge;

Seven, demolition blasting;

Eight, thing process is removed.

Compared with prior art, the invention has the beneficial effects as follows:

The present invention adopts demolition blasting large bridge, and it has, and workload is little, efficiency advantages of higher; And the present invention is that large bridge demolition blasting constructor provides a set of safe construction plateform system, the method easy construction, the simple and reliable property of system architecture is good, available protecting constructor can avoid falling accident, and execution conditions easily can be provided for a series of constructions such as the boring of constructor, powder charge, blockings, extremely meet the actual demand of demolition blasting safety and efficiency aspect; To sum up, specific works amount of the present invention is little, the advantages such as efficiency is high, safe and reliable.

Detailed description of the invention

Below by specific embodiment, the invention will be further described, but claimed scope is not limited to content described in the present embodiment.

A kind of large bridge blasting demolishing method, comprises the following steps:

The first, bridge floor opening: the bridge floor above bridge pier or column adopts quartering hammer construct and break multiple length × wide bridge floor opening for 1.0m × 2.0m;

The second, set up cat ladder: set up cat ladder at bridge floor opening part, facilitate the current of personnel and equipment;

Cat ladder adopts steel-pipe welding to form, upper and lower steel pipe spacing 0.4m, wide is 0.5m, the length of several cat ladder is determined according to the spatial altitude of installed position, it can be 6m, 4m, 2m etc., be placed in bridge floor opening part below each bridge floor opening after cat ladder completes, the upper and lower and equipment carrying for convenience of personnel, it is to have constant slope that the cat ladder at column place is laid;

Three, set up scaffold: bridge pier place sets up scaffold by land, for personnel up and down, handling equipment, borehole charge, installation protection, lay corridor;

The adjacent land bridge pier of scaffold is set up, it adopts fastener type to assemble, following requirement should be followed: 1. extend to both sides from a bight and hand over circle to set up when setting up, first locate and set up vertical rod successively, vertical rod is connected with bar of sweeping the floor in length and breadth, the height of bar of sweeping the floor must not be greater than 300mm, then first step size cross bar is set up, after correcting vertical and level thereupon, the junction button of each bar is tightened, and set up as required, 2. bridging is established at scaffold two ends, bridging and ground angle are 45 °, also increasing by 2 ~ 4 therebetween detains node for the vertical rod of two ends rotary buckle and scaffold or leger fastening, 3. the deviation of vertical rod should not be greater than frame high 1/300, and control its absolute deviation values simultaneously and should not be greater than 75mm, the spreading position of 4. going up sheer pole should be staggeredly arranged in different vertical rod advances, / 3rd of an advance is not more than with close distance, the horizontal departure of same row's leger is not more than 1/250 of this sheet scaffold total length, and be not more than 50mm, the leger of adjacent step frame should be staggeredly arranged in the inboard of vertical rod and outside, to reduce vertical rod eccentric force situation, 5. scaffold set up middle vertical rod, horizon bar, little tringle, an application right angle button fastener that links for wall connecting rod connects, the extended spot of vertical rod will stagger mutually in asynchronous distance, at connecting rod, leger, the connecting end portion of little cross bar should stretch out fastener 20mm ~ 30mm,

Four, arrange hanging basket: above bridge floor opening part, arrange hanging basket, hanging basket adopts elevator lifting, convenient from bridge floor opening part shipment personnel, equipment, carries out that brill is quick-fried, construction of prevention work;

At bridge floor overthe openings wire rope hoist for promoting hanging basket, hanging basket and hoist engine is connected with steel cable, hanging basket can be put down to bridge pier place for construction, personnel equipment can pass in and out hanging basket after promoting hanging basket to bridge floor place with hoist engine, after hanging basket installation, namely available hanging basket carries out holing and charging as mobile work platform, and use hoist engine adjustment construction location, hanging basket can be multiple;

Five, set up corridor, railing: set up corridor at the arch rib place of bridge, facilitate the current and equipment carrying of workman, set up railing on both sides, corridor;

Corridor and railing all adopt steel pipe manufacture, be mainly used in the construction at bridge arch, arch rib place, railing is except the security protection for also can be used for cat ladder except corridor, railing mainly adopts welding, the mode of tying up is fixed on cat ladder, a corridor is all established at every bar bridge arch place, horizontal corridor is also set simultaneously and connects longitudinal corridor formation network type passage, convenient current and fixing.

Six, boring, powder charge;

Position boring suitable below bridge pier, column and bridge floor, and powder charge;

Seven, demolition blasting;

Carry out the protection of surrounding environment safety, explosion is carried out to bridge;

Eight, thing process is removed;

Dismounting thing after explosion is processed.

Claims (1)

1. a large bridge blasting demolishing method, is characterized in that: comprise the following steps:

The first, bridge floor opening: the bridge floor above bridge pier or column breaks bridge floor and form the opening passed through for personnel, equipment;

The second, set up cat ladder: set up cat ladder at bridge floor opening part, facilitate the current of personnel and equipment;

Three, set up scaffold: bridge pier place sets up scaffold by land, for personnel up and down, handling equipment, borehole charge, installation protection, lay corridor;

Four, arrange hanging basket: above bridge floor opening part, arrange hanging basket, hanging basket adopts elevator lifting, convenient from bridge floor opening part shipment personnel, equipment, carries out that brill is quick-fried, construction of prevention work;

Five, set up corridor, railing: set up corridor at the arch rib place of bridge, facilitate the current and equipment carrying of workman, set up railing on both sides, corridor;

Six, boring, powder charge;

Seven, demolition blasting;

Eight, thing process is removed.