CN1197154A - Construction method and appts. for hardening layer of support - Google Patents

Abstract

A method for building a hardened supporting layer features that an instantaneously solidified hardening material is injected in by high-pressure nozzle to construct a hardened supporting layer and the excess underground pressure generated by high-pressure spray and residual slurry are treated by spraying the mixture of 2 kinds of liquid and water to clean foundation. A dual-sprayer whose nozzles are respectively connected to two channels and an injection rod with clean water nozzle are inserted in foundation as target. The hardening liquid A and B and clean water are sprayed out at a certain depth while the underground pressure generated by high-pressure spray is sucked. The injection tube is rotating while pulled out to form a hardened layer in tube trace.

Description

Support the construction job practices and the device of hardened layer

The present invention relates to the support of the lining cutting support of tunnels such as tunnel and building lot or be purpose and with the water proof at undermine the construction job practices and the device of the support hardened layer built on every side.

Always, the construction of the support hardened layer that forms with the high-pressure injection injection technology, because packed density and infiltrative problem, mainly be to use the hardened material of slow setting to carry out, but support lining cutting with the slow setting hardened material, because its firm time is long, thereby make engineering progress with being difficult to cooperate excavation speed.

And if excavate when fully not hardening, major accident will inevitably take place in the effect that then can not be supported.

In the past by injecting the support lining cutting that forms, particularly when injecting, do not use cap material with flash set effect, because the flash set hardened material has 2 kinds of fluidities, mix, in the short time, just harden by 2 kinds of liquid, the hardened material that sprays is just sclerosis before fully infiltration is filled, so produce different density at implanted layer, can not obtain the hardened layer of homogeneous.

And, the injection of the flash set hardened material before above-mentioned, in order to improve packed density, once injecting by low pressure, make native interparticle arrangement not collapse and pass to permeate with gap and carry out as emphasis, but recently, the nozzle that sprays clear water is set on the top of the nozzle that sprays the flash set hardened material, to the carrying out of spraying the native interparticle gap that clear water forms high-pressure injection flash set hardened material on the soil of whole preface.

But the ground internal pressure of being put aside by the high-pressure injection of flash set hardened material becomes overpressure, can hinder the prolongation of the arrival distance of hardened material, has in addition to make it that problem of density take place in the process of osmosis of hardened material.

And the clear water on top sprays and hinders the effusion of pressing and remaining mud in the ground, thereby makes the construction of the homogeneous hardened material layer figure difficulty that becomes, and the effect of rare high-pressure injection flash set hardened material is reduced by half.

The present invention develops for solving the problem corresponding with above-mentioned problem, leading section is provided with the coincidence nozzle that is communicated with 2 runners respectively, offering at an upper portion thereof and extruding mouth, and the injection bar that water nozzle will be set at an upper portion thereof inserts the object ground, spray clear water in prescribed depth from the clear water injection nozzle, and from overlapping nozzle high pressure force feed hardened material A liquid and hardened material B liquid, from each nozzle ejection high velocity jet, simultaneously, on one side from extruding mouthful ground internal pressure that suction is produced by high-pressure injection, rotate ascending pipe and edge on one side and transfer to direction to move, thereby on the ascending pipe track, build hardened layer.

Fig. 1 is the vertical section enlarged side view of the injection bar leading section structure of the expression embodiment of the invention.

Fig. 2 is the unitary side view of the expression embodiment of the invention to horizontal direction construction situation.

Embodiments of the present invention below are described with reference to the accompanying drawings.The 1st, inject bar, have the 1st runner the 11, the 2nd runner the 12, the 3rd runner 13, each runner is communicated with nozzle 21,22,23 respectively and opening, and 22,23 constitute the coincidence nozzle, and 21 constitute water nozzles.

The 24th, extrude mouth, overlapping opening between nozzle and the water nozzle, sucked by negative pressure by ground internal pressure or the residue mud that high-pressure injection produced, and be discharged to the outside by discharging road 14.

The rear end of injecting bar 1 is connected with flexible pipe 31,32,33 by rotating part 3, and flexible pipe is connected with supply unit, and the injection bar actuating mechanism 5 and the bar steering mechanism 6 that are installed in simultaneously on the chassis 4 that constitutes pedestal are supporting.

At first, make the angle of injecting bar 1 relative insertion object ground at vertical direction, horizontal direction, the directional steering of steeving by bar steering mechanism 6, simultaneously, inject bar 1 and insert the object ground and inject actions such as bars advance, retreat, rotation relatively for making by injecting bar actuating mechanism 5.

The high pressure pumping apparatus that is connected with flexible pipe 31,32,33 and applies high pressure to injection material is made of piston-type hydraulic cylinder and valve chamber and the pressure-responsive body that transmits pressure to valve chamber from the hydraulic cylinder chamber, and the pressure-responsive body constitutes by proportion oily such liquid different with being filled in hardener liquid between two Room with the elastic membrane of its action.

The filling liquid that constitutes the response body moves between hydraulic cylinder and valve chamber with the volume-variation amount that is caused by the action of piston, and corresponding therewith hardener liquid is flowed in the valve chamber, by the opposite action of piston institute force feed.

Around here by the injection material of force feed because the existence of filling liquid and do not suck force feed contiguously with diaphragm or plunger, can prevent from the consumption that causes because of sliding friction to improve delivery efficiency.

Clack box is made of valve seat, valve body and spring, and this valve seat is respectively equipped with the entry and exit passageway, the seat portion that are communicated with valve chamber and forms the big hemispheric concave that arrives, and forms a plurality of apertures vertically from concave surface; Valve body is by constituting with the corresponding spheroid of concave; The spring handle valve body pushes to valve seat.The action of ball valve is more advancing the raising of pressure.

The injection bar 1 that installs is in this wise advanced to object ground X1 insert, when arriving the degree of depth of regulation, use 200kg/mg ²～500kg/cm ²High pressure to the 1st runner 11 force feed clear water, to the 2nd runner 12 force feed A liquid, to the 3rd runner 13 force feed B liquid, from nozzle 21,22,23 high-pressure injections respectively, making rotation edge, injection bar limit extract direction retreats, spray clear water by nozzle 21 from the runner 11 that is arranged on top, inject hardened material from nozzle 22,23 to the y of track portion of whole preface, build cylindric hardened material layer.

A liquid and B liquid from nozzle 22,23 difference high-pressure injections, because it is mixed that the coincidence of nozzle was configured in the almost while of spraying, by the spinning movement of bar while cut stir around ground use the clear water on top to spray the soil of sneaking into the y of track portion that puts in order preface, and rise by the ground internal pressure that high-pressure injection causes, with not having the residue mud of loss place to flow into extrusion mouth 24 simultaneously, be discharged to the outside by drain passageway 14 because of continuing the clear water injection.

Because the discharge of ground internal pressures that extrusion mouth 24 forms and residue mud makes internal pressure decline redundantly, keeps suitable injection environment, thereby can make the injection hardened material reach the distance of defined, can continue hardened material is evenly sneaked into to soil simultaneously.

Claims (2)

1, a kind of construction job practices that supports hardened layer, it is characterized in that: leading section is provided with the coincidence nozzle that is communicated with 2 runners respectively, offering at an upper portion thereof and extruding mouth, and the injection bar that water nozzle is set at an upper portion thereof inserts the ground as object, by spraying clear water from water nozzle at the prescribed depth place, and from overlapping nozzle high pressure force feed hardened material A liquid and hardened material B liquid, from each nozzle ejection high velocity jet, absorb ground internal pressure simultaneously by high-pressure injection produced from extrusion mouthful limit, the limit makes the ascending pipe rotation and moves along extracting direction, thereby builds hardened layer along the ascending pipe track.

2, a kind of constructing device that supports hardened layer, it is characterized in that: be the injection bar is bearing on the pedestal that is provided with the rotating mechanism that injects bar and forward-reverse mechanism and constitutes, this injection bar is at leading section the coincidence nozzle that is communicated with 2 runners respectively to be set, offer at an upper portion thereof and extrude mouthful, and water nozzle also is set at an upper portion thereof.