CN201679505U

CN201679505U - Balanced-type injection pipe

Info

Publication number: CN201679505U
Application number: CN2010201580726U
Authority: CN
Inventors: 周顺华; 孙玉永; 肖军华; 陈焘
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2010-04-14
Filing date: 2010-04-14
Publication date: 2010-12-22
Anticipated expiration: 2020-04-14

Abstract

The utility model relates to a balanced-type injection pipe which belongs to an injection device for underground pipe shed construction. When pipes of the pipe shed are in position, the pipe shed grouting is carried out to reinforce the strength and stability of the surrounding rock. The balanced-type injection pipe is provided with an internal pipe and an external pipe, a plurality of grouting holes are arranged on the internal pipe and communicated with the external pipe. A plurality of independent holes are arranged on the external pipe, moisture in the grout can permeate the external pipe through the holes and the grout is prevented from permeating the internal pipe. When the surrounding rock is reinforced by grouting, the grout permeates soil through grouting holes due to the high pressure of the internal pipe and improves the loosening structure of the surrounding rock; when the pressure of the soil body is over high, the moisture in the soil body can permeate a grouting pipe through holes on the external pipe, so the moisture between the internal and external pipes is removed, the internal and external pressure of the grouting pipe is balanced and good grouting effect is realized.

Description

The balanced type Grouting Pipe

Technical field

The utility model relates to constructing tunnel equipment, specifically refers to employed a kind of balanced type Grouting Pipe in the construction of pipe canopy advance support.

Background technology

In the work progress of shallow burial hidden digging, when the self-stable ability of country rock relatively poor, even when not having self-stable ability, for the steady operation face, guarantee the safety of constructing, need carry out the grouting and reinforcing stratum before excavation, strengthen the intensity and the stability of country rock, the effect of water blockoff also can be played in the stratum of grouting and reinforcing simultaneously.

The grouting reinforcement rock technology is a kind of comparatively effective method commonly used in the underground construction, and when the earthing of engineering was more shallow, country rock was more open within the specific limits, and bulk strength reduces, and self-stability can be relatively poor.By grouting reinforcement rock, can change the loose structure of country rock, improve adhesion stress and angle of internal friction, the sealing crack significantly improves rock mass strength.In the bolt-spary supports tunnel, behind the grouting reinforcement rock, can be anchor pole provides and puts forth effort the basis reliably, and anchor pole is recovered the anchor pole effect of the country rock of loose crushing, helps the stable of tunnel.

The present employed injecting paste material of grouting reinforcement rock, the cement grouts that adopt more, cement grout has adhesion stress and compressive strength preferably to loose country rock, also can in cement, add certain chemical material, to reach the purpose of reinforcing country rock, raising water plugging effect early and reducing construction costs, the common chemical material has water glass, acrylates, clay curing compound slurry material etc.

In underground pipe roof construction, promptly carry out tube shed grouting after pipe puts in place under the pipe canopy, to reinforce the intensity and the stability of country rock.Yet in existing Grouting Pipe, what have is simple in structure, cheap, easy obstruction, slip casting difficulty, and grouting quality can not guarantee that the high-pressure slip-casting pipe that has though its quality is better, but costs an arm and a leg.

Summary of the invention

The purpose of this utility model is according to above-mentioned the deficiencies in the prior art part, proposes a kind of balanced type Grouting Pipe, has designed inside and outside two pipes, and interior pipe is provided with several slip casting holes, and these slip casting holes are communicated with outer tube.Also be provided with some independently holes on the outer tube simultaneously, these holes allow the moisture in the slurries to infiltrate in the pipe, infiltrate interior pipe but can intercept slurries.The utlity model has the function of balance Grouting Pipe external and internal pressure, and good slip casting effect.

The purpose of this utility model realizes being finished by following technical scheme:

A kind of balanced type Grouting Pipe, it is characterized in that this balanced type Grouting Pipe is made up of interior pipe and outer tube, form interlayer between interior pipe and outer tube, be provided with some injected holes on the inner and outer pipe tube wall, pipe and outer tube in the described injected hole conducting, outer tube wall is provided with some infiltrations hole, described infiltration hole conducting outer tube and interlayer.

Has separation layer between above-mentioned injected hole and the described interlayer;

Above-mentioned injected hole directly upwards evenly distributes in the inner and outer pipe tube wall and is provided with;

Above-mentioned inner and outer pipe tube wall uniform four injected holes that directly make progress.

The utility model has the advantages that, simple in structure, easy construction, cost are not high, slip casting effect is good, when using balanced type Grouting Pipe grouting reinforcement rock, the high pressure of interior pipe impels slurries to penetrate in the soil body by injected hole, thereby plays the effect of the loose structure that changes country rock, when the hypertonia in the soil body, moisture in the soil body can be got rid of from the interlayer of inside and outside two pipes by in the infiltration of the hole in the outer tube Grouting Pipe again, thereby reaches the effect of balance Grouting Pipe external and internal pressure.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the A-A sectional drawing of Fig. 1;

Fig. 3 is the B-B sectional drawing of Fig. 1.

The specific embodiment

The utility model feature and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:

Label 1-6 representative is interior pipe 1, outer tube 2, interlayer 3, injected hole 4, infiltration hole 5, separation layer 6 among the accompanying drawing 1-3.

Accompanying drawing 1 is the structural representation of the utility model balanced type Grouting Pipe, i.e. sectional view.As seen from Figure 1, this balanced type Grouting Pipe is by interior pipe 1 and 2 two-tube compositions of outer tube, and 2 of interior pipe 1 and outer tubes have interlayer 3 existence, the inner and outer pipe tube wall is provided with injected hole 4, injected hole 4 is a through hole, pipe 1 and outer tube 2 in the conducting, but have separation layer 6 between injected hole 4 and the interlayer 3.Slurries in the Grouting Pipe can pass through the inner and outer pipe tube wall by injected hole, infiltrate in the peripheral soil body, play the effect of the loose structure that changes country rock.

Fig. 2 is the A-A sectional drawing of Fig. 1.From Fig. 2 as seen, in the present embodiment, injected hole directly upwards evenly distributes in the inner and outer pipe tube wall and is provided with, inner and outer pipe tube wall uniform four injected holes that directly make progress.

In addition, outer tube wall is provided with some holes 5 of independently seeping water, as shown in Figure 3, and infiltration hole conducting outer tube and interlayer.When the hypertonia in the soil body, the moisture in the soil body can infiltrate in the Grouting Pipe by the infiltration hole in the outer tube 5, discharges from the interlayer of inside and outside two pipes.

In the present embodiment, when using the utility model balanced type Grouting Pipe grouting reinforcement rock, at first hole to prescribed depth, then Grouting Pipe is correctly packed into boring in, guarantee that the Grouting Pipe direction is consistent with boring direction, carry out plug-hole with fast setting cement again, with high pressure cement paste is pressed in the Grouting Pipe at last, cement paste can be gone in the hole wall crack by the eyelet pressure injection of Grouting Pipe, near fixed rock-soil layer.The formulation of grouting parameter depends primarily on the loose range of country rock, and install and the control of grouting pressure and the effect of grouting reinforcement rock of Grouting Pipe have direct relation.When grouting pressure does not just reach designing requirement, the penetration radius of slurries will be affected, and the scope of reinforcing and effect just can't guarantee.

When cement grout when injecting uniform granular soil layer, the resistance that slurries run into increases gradually, the volume of soil has begun to compress and absorb a part of volume that injects slurries.When the hypertonia in the soil body, the moisture in the soil body can infiltrate in the Grouting Pipe by the infiltration hole in the outer tube, discharges from the interlayer of inside and outside two pipes.Further increase along with the slurries injection rate, constricted zone progressively enlarges and reaches a stationary value gradually, the decrement of the soil body has absorbed the whole volumes that inject slurries, and in slurries continuation injection process, remain unchanged, along with the continuation of slurries is injected, the intensity of the soil body and stability also further increase, and meanwhile the pressure in the constricted zone also little by little increases, when grouting pressure reaches certain value, can think that grouting quality is guaranteed.

Claims

1. balanced type Grouting Pipe, it is characterized in that this balanced type Grouting Pipe is made up of interior pipe and outer tube, form interlayer between interior pipe and outer tube, be provided with some injected holes on the inner and outer pipe tube wall, pipe and outer tube in the described injected hole conducting, outer tube wall is provided with some infiltrations hole, described infiltration hole conducting outer tube and interlayer.

2. a kind of balanced type Grouting Pipe as claimed in claim 1 is characterized in that having separation layer between described injected hole and the described interlayer.

3. a kind of balanced type Grouting Pipe as claimed in claim 1 is characterized in that described injected hole is in the directly upwards evenly distribution setting of inner and outer pipe tube wall.

4. a kind of balanced type Grouting Pipe as claimed in claim 3 is characterized in that four injected holes of described inner and outer pipe tube wall radial equipartition.