CN208280005U - The support reinforcement structure of viaduct pier when a kind of excavation of foundation pit - Google Patents

Abstract

The utility model belongs to architecture Foundation Pit Engineering technical field, in particular to be a kind of viaduct pier near excavation pit supporting construction.A vertically arranged mini-valve tube of circle is equipped with around bridge pier, pier coping portion is equipped with pier cap, connects between pier cap and ground end diaphragm wall by reinforced concrete block.The support reinforcement structure of viaduct pier when a kind of excavation of foundation pit of the utility model effectively can be located at the bridge pier near excavation of subway foundation pit by reinforcement and repair, and reduction excavation of foundation pit is influenced caused by bridge pier, and improves the bearing capacity and durability of bridge pier.

Description

The support reinforcement structure of viaduct pier when a kind of excavation of foundation pit

Technical field

The utility model belongs to architecture Foundation Pit Engineering technical field, in particular to be a kind of near excavation pit The supporting construction of viaduct pier.

Background technique

With the fast development of China's economy, the traffic capacity of subway and bridge rapidly increases in China city.Institute Inevitably to increase the quantity of subway line and overpass in city, the excavation of foundation pit will cause stress to bridge pier Disturbance, destroys the stability of bridge pier.In addition bridge long service, the case where disease and Lack of support that many bridge piers occur. This variety of factors can all seriously affect the safety of bridge structure.

The case where disturbing caused by bridge pier for excavation of subway foundation pit, domestic and international project circle has using some reinforcings at present Method bridge pier is reinforced, such as to slip casting around bridge pier, paste steel plate or steel reinforcing method, paste fibre sheet material and add Gu method or some engineerings do not have any reinforcement protection technology to bridge pier.Wherein paste steel plate, reinforcing bar, fibre sheet material method for strengthening The influence that will receive environment and load causes its durability to decrease, to influence the long-term reinforcement performance of bridge pier, has one Fixed limitation.

Utility model content

The purpose of this utility model is to provide a kind of support reinforcement structures of viaduct pier when excavation of foundation pit.

The purpose of this utility model is achieved through the following channels: the reinforcing branch of viaduct pier when a kind of excavation of foundation pit Protection structure, is equipped with a vertically arranged mini-valve tube of circle around bridge pier, and pier coping portion is equipped with pier cap, pier cap and ground end It is connected between diaphragm wall by reinforced concrete block.

The reinforced concrete block as a further optimization of the solution, is provided with steel reinforcement cage, mixed using C25 Solidifying soil pours.

The support reinforcement structure of viaduct pier when a kind of excavation of foundation pit of the utility model effectively can be located at ground by reinforcement and repair Bridge pier near iron excavation pit, reduce excavation of foundation pit influences caused by bridge pier, and improves the bearing capacity of bridge pier and durable Property.

Detailed description of the invention

The utility model is described in further detail with reference to the accompanying drawing:

Fig. 1 is the utility model section structural schematic diagram；

Fig. 2 is the utility model overlooking structure diagram；

In figure, reinforced concrete block 1, ground end diaphragm wall 2, mini-valve tube 3, pier cap 4, bridge pier 5.

Specific embodiment

As shown in Figure 1 and Figure 2, when a kind of excavation of foundation pit of the utility model viaduct pier support reinforcement structure, in bridge pier It is equipped with a vertically arranged mini-valve tube 3 of circle around 5, is equipped with pier cap 4, pier cap 4 and ground end diaphragm wall 2 at the top of bridge pier 5 Between connected by reinforced concrete block 1.The reinforced concrete block 1, is provided with steel reinforcement cage, using C25 concrete It pours.

Due to there is armored concrete block chaining between pier cap and ground end diaphragm wall, so can effectively alleviate due to base Hole, which is excavated, causes bridge pier close to the situation of the bearing stress deficiency of foundation pit side.Soil layer is disturbed since excavation of foundation pit receives around bridge pier It is dynamic, grouting and reinforcing is carried out to soil layer around by mini-valve tube, is to form a circle reinforcing layer around bridge pier.Reinforcing layer and reinforced concrete Assembled pier is formed with the bridge pier damaged or bearing capacity does not live after soil block maintenance molding, largely improves the carrying of bridge pier Power has good mechanical property and economic benefit.

Construction method the following steps are included:

Step 1: being excavated to exposing pier cap close to foundation pit side in bridge pier first, then plane digging one from cushion cap Hole, the hole depth are 1m, and width is of same size with cushion cap, and length is from cushion cap to ground end diaphragm wall.

Step 2: a steel reinforcement cage being done according to the size in hole, then placing concrete, which is formed, reinforces, and conserves molding.

Step 3: by earthen backfill after armored concrete formation of lots.

Step 4: embedded mini-valve tube determines hole location, and by floor plan unwrapping wire, positioning, mini-valve tube depth is into severely-weathered 1.5m, is 0.5m close to foundation pit side mini-valve tube spacing, remaining spacing is 0.8m.Determine that hole location drills later.First just by drilling machine In the hole location good with setting-out of position, the leveling of drilling machine base is then carried out, it is ensured that less than 1%, leveling drilling machine is being switched on drilling hole deviation.It wants Hole location deviation is asked to be less than 10cm.Mini-valve tube construction is carried out after the completion of drilling, when mini-valve tube is installed should centering as far as possible, with its sharp periphery The uniform of thickness of the shell is covered on same section, is conducive to open loop quality.It should be noted that the outer rubber case of protection mini-valve tube slurry outlet in construction It unshifts and falls off, prevent sundries from entering in pipe.

Step 5: open loop slip casting starts grouting pump by slurry casting machine down toward the hole section for needing slip casting, force feed clear water, herein mistake Pressure steps up in journey, and the sheath body until washing rubber sleeve valve and corresponding position open after pressure is fallen after rise, pumps cement grout, Slip casting always is to the pressure of design defined and until stablizing；In the process can optionally or design code carry out interval note Slurry, until meeting design requirement.Then step 5 is repeated, at each position for needing slip casting according to appeal way gradually open loop Slip casting, the slip casting until completing all hole sections.Items record during carrying out slip casting, open ring position, slip casting time, slip casting pressure The special circumstances etc. that power, cement consumption, the ratio of mud, slip casting process occur.After slip casting reaches design requirement, detergent line and sleeve valve Pipe removes Grouting Pipe, carries out the slip casting in next hole.

Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to In this, anyone skilled in the art, can be without creative labor in the technical scope disclosed by the utility model The dynamic change or replacement expected, should be covered within the scope of the utility model.Therefore, the protection model of the utility model Enclosing be determined by the scope of protection defined in the claims.

Claims (2)

1. the support reinforcement structure of viaduct pier when a kind of excavation of foundation pit, it is characterised in that: be equipped with a circle around bridge pier (5) Vertically arranged mini-valve tube (3), bridge pier (5) top is equipped with pier cap (4), between pier cap (4) and ground end diaphragm wall (2) It is connected by reinforced concrete block (1).

2. the support reinforcement structure of viaduct pier when a kind of excavation of foundation pit as described in claim 1, it is characterised in that: described Reinforced concrete block (1), be provided with steel reinforcement cage, formed using C25 concreting.