CN216691379U

CN216691379U - Vacuum suction device for step-by-step sectional type tunnel curtain grouting

Info

Publication number: CN216691379U
Application number: CN202123283305.2U
Authority: CN
Inventors: 王玥; 赵爽; 魏晨亮; 张振兴; 徐启鹏; 宋妍; 李广跃; 倪汉杰; 皮乾勇; 贺雄飞; 史继尧; 王文飞; 张丹枫
Original assignee: CRTG Survey and Design Institute Co Ltd
Current assignee: CRTG Survey and Design Institute Co Ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-06-07
Anticipated expiration: 2031-12-24

Abstract

The utility model discloses a vacuum suction device for step-by-step sectional type tunnel curtain grouting, which comprises: the vacuum pumping and discharging barrel comprises a liquid storage barrel, a vacuum pumping and discharging barrel and a liquid storage barrel, wherein the liquid storage barrel is a vertically arranged steel sealing barrel and is used for temporarily storing pumping and discharging liquid; the upper end of the liquid storage barrel is provided with a vacuum pump and a negative pressure meter; the upper part and the lower part of the side wall of the liquid storage barrel are respectively provided with a liquid inlet pipe and a liquid outlet pipe which are communicated with the inner cavity of the barrel, and a liquid inlet valve is arranged on the liquid inlet pipe; a drain valve is arranged on the drain pipe; when the water injection washes the country rock, the feed liquor pipe is connected with the rear end of a built-in barrel, and the suction is with rivers and fine particle suction in the stock solution bucket. The vacuum suction device is used for sucking out fine sand and water in tunnel surrounding rocks, the suction is thorough, the suction can be continuously carried out, and the construction continuity is guaranteed.

Description

Vacuum suction device for step-by-step sectional type tunnel curtain grouting

Technical Field

The utility model belongs to the technical field of tunnel grouting reinforcement, and particularly relates to a vacuum suction device for step-by-step sectional type tunnel curtain grouting.

Background

In the tunnel construction process, tunnel curtain grouting construction is one of the most effective means for improving the stratum, but in many undisturbed fine-grained soil strata, such as the stratum with fine sand, fine sand with clay, fine sand with gravel and the like, the water permeability is easy, the self-stability is poor, meanwhile, the fine particles are compact and dense, the conventional cement slurry (suspension) is extremely difficult to inject, even if expensive chemical slurry (solution) is adopted, the diffusion radius is difficult to break through 1m, the strength of the slurry vein concretion body is low and is usually less than 0.5MPa (the strength of the cement slurry concretion body is usually more than 10MPa), and the effect of stratum grouting reinforcement is difficult to achieve. In actual tunnel curtain grouting construction, methods such as encrypted drilling, high-pressure grouting, repeated grouting and the like are often forced to be adopted, severe extrusion and disturbance are easily generated on peripheral stratums, large deformation is generated, and the safety of buildings (structures) is endangered.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a vacuum suction device for step-by-step sectional type tunnel curtain grouting, which is used for sucking out fine sand and water in tunnel surrounding rocks, is thorough in suction and can be continuously carried out, and the continuity of construction is ensured.

The utility model adopts the following technical scheme: a vacuum suction apparatus for step-wise staged tunnel curtain grouting, comprising:

the vacuum pumping and discharging barrel comprises a liquid storage barrel, a vacuum pumping and discharging barrel and a liquid storage barrel, wherein the liquid storage barrel is a vertically arranged steel sealing barrel and is used for temporarily storing pumping and discharging liquid; the upper end of the liquid storage barrel is provided with a vacuum pump and a negative pressure meter;

the upper part and the lower part of the side wall of the liquid storage barrel are respectively provided with a liquid inlet pipe and a liquid outlet pipe which are communicated with the inner cavity of the barrel, and a liquid inlet valve is arranged on the liquid inlet pipe; a drain valve is arranged on the drain pipe; when the water injection washes the country rock, the feed liquor pipe is connected with the rear end of a built-in barrel, and the suction is with rivers and fine particle suction in the stock solution bucket.

Further, each built-in barrel includes:

the connecting pipes are of multi-section detachably connected pipe body structures, are inserted into the corresponding pipes, have front ends facing the pipe bottoms and can move back and forth in the pipes;

the gun head is a hard tube body and is detachably arranged at the front end of the connecting tube; the front section of the tube body is in a solid closed shape, and a plurality of communicating holes are formed in the tube body in the middle section;

the isolation pistons are arranged at the front end and the rear end of the gun head in a sleeved mode, the outer diameter of the isolation pistons is consistent with the inner diameter of the pipe into which the isolation pistons are inserted, and the isolation pistons are tightly attached to the pipe wall so as to seal the pipe section between the isolation pistons into a closed space.

Furthermore, an observation window is arranged on the side wall of the liquid storage barrel and in the area where the liquid inlet pipe is located, and is used for observing the color, the property and the flow of liquid flowing into the barrel from the liquid inlet valve and the height of the liquid level in the barrel.

The utility model has the beneficial effects that: 1. the vacuum pumping barrel is arranged, vacuum is formed in the barrel, and the vacuum pumping barrel is also used for temporarily storing pumped and discharged liquid and silt, so that the continuity of a pumping process is ensured, and the vacuum degree of pumping is also ensured. And 2, adopting a matched built-in gun barrel, inserting the built-in gun barrel into each tube, sealing the section where the built-in gun barrel is positioned, vacuumizing the section where the built-in gun barrel is positioned, ensuring the sealing property of the section where the built-in gun barrel is positioned, and facilitating vacuumizing.

Drawings

FIG. 1 is a schematic view of a vacuum suction apparatus;

FIG. 2 is a schematic view of a built-in gun barrel;

FIG. 3 is a schematic view of a vacuum tube;

FIG. 4 is a schematic diagram of a vacuum tube segment;

FIG. 5 is a schematic view of the structure of an isolated pipe section;

wherein: 2. a vacuum tube;

4-2, a second grouting pipe section;

5. a vacuum pipe section; 51. a vent hole; 52. an isolation net;

6. an isolation capsule sleeve; 6a, isolating the pipe section; 62. an expansion sleeve;

7. a barrel is arranged inside; 71. a gun head; 72. an isolation piston; 73. a connecting pipe; 74. a quick coupling; 75. a communicating hole;

8. vacuumizing and discharging the barrel; 81. a liquid storage barrel; 82. a vacuum pump; 83. a negative pressure gauge; 84. a liquid inlet valve; 85. a drain valve; 86. observation window.

Detailed Description

The utility model is described in detail below with reference to the drawings and the detailed description.

The utility model discloses a vacuum suction device for step-by-step sectional type tunnel curtain grouting, which comprises a vacuum pumping barrel 8, wherein the vacuum pumping barrel 8 comprises a liquid storage barrel 81 which is a vertically arranged steel sealed barrel, can resist the external atmospheric pressure without deformation when vacuum is formed in the barrel, and has the volume of not less than 1m³For temporarily storing the pumped liquid; a vacuum pump 82 and a negative pressure gauge 83 are arranged at the upper end of the liquid storage barrel 81; the vacuum pump 82 is communicated with the interior of the liquid storage barrel 81 and is used for pumping air in the barrel to form vacuum negative pressure. The negative pressure gauge 83 is communicated with the interior of the liquid storage barrel 81 and is used for monitoring the vacuum degree in the barrel.

The upper part and the lower part of the side wall of the liquid storage barrel 81 are respectively provided with a liquid inlet pipe and a liquid outlet pipe which are communicated with the inner cavity of the barrel, and a liquid inlet valve 84 is arranged on the liquid inlet pipe; a drain valve 85 is installed on the drain pipe, and the drain valve 85 is a large-diameter ball valve. When the water is injected to wash the surrounding rock, the liquid inlet pipe is connected with the rear end of the built-in gun barrel 7, and water flow and fine particles are sucked into the liquid storage barrel 81.

An observation window 86 is arranged on the side wall of the liquid storage barrel 81 and in the area where the liquid inlet pipe is located, and is used for observing the color, the character and the flow of the liquid flowing into the barrel from the liquid inlet valve 84 and the height of the liquid level in the barrel.

As shown in fig. 2, each of the built-in gun tubes 7 is adapted to be inserted into the corresponding vacuum tube 2 and grouting pipe 1, and each of the built-in gun tubes 7 includes: a connection pipe 73 having a multi-section detachably connected pipe structure, inserted into the corresponding pipe, having a front end facing the bottom of the pipe, and movable back and forth in each pipe; the connecting pipes 73 are connected through quick connectors 74; the gun head 71 is a hard pipe body and is detachably arranged at the front end of the connecting pipe 73; the front end section is solid and closed, and the pipe body in the middle section is provided with a plurality of communicating holes 75.

The number of the isolation pistons 72 is two, the isolation pistons are sleeved at the front end and the rear end of the gun head 71 at intervals, namely, the part of the gun head 71, which is provided with the communication hole 75, is positioned between the two isolation pistons 72, the outer diameter of each isolation piston 72 is consistent with the inner diameter of the pipe into which the isolation piston is inserted, and the isolation pistons 72 are tightly attached to the pipe wall so as to seal the pipe sections positioned between the isolation pistons 72 into a closed space, and the isolation pistons 72 move along with the movement of the connecting pipe 73 to sequentially seal different pipe sections into the closed space.

When the vacuum suction device is used, the following concrete steps are performed: inserting a built-in gun barrel 7 into a pipe to be vacuumized, wherein one form of the built-in gun barrel is that the pipe to be vacuumized is a vacuum pipe 2, the vacuum pipe 2 is inserted into a grouting hole, the vacuum pipe 2 is formed by connecting a plurality of communicated vacuum pipe sections 5 and a plurality of isolation pipe sections 6a at intervals, the vacuum pipe section 5 is connected at the foremost end, and the middle part of each vacuum pipe section 5 is communicated with the grouting hole; as shown in FIG. 4, a vent hole 51 is arranged in the middle of the vacuum pipe section 5, and an isolation net 52 is wrapped on the outer side of the pipe wall for preventing large-particle silt from entering the vacuum pipe section. Each isolation pipe section 6a is of a double-layer sleeve structure and comprises a second grouting pipe section 4-2 and an isolation bag sleeve 6 which are sleeved together from inside to outside, and two ends of the isolation bag sleeve 6 are attached to and sealed with outer walls of two ends of the second grouting pipe section 4-2 to form an expansion bag cavity with two closed ends; the front ends of the vacuum pipe sections 5 at the most front ends are respectively connected with a cone-shaped closed pipe head, and the front ends of the pipe heads are closed. As shown in fig. 5, each isolation capsule 6 comprises an expansion sleeve 62 and two sealing hoops, both of which are of hollow cylindrical structure, wherein the sealing hoops are made of PVC hard plastic material, the expansion sleeve 62 is made of high-elasticity rubber material, the sealing hoops are located on the expansion sleeve 62, and the ends are tightly bonded together through hot working to form an integral hollow isolation capsule 6 with the sealing hoops at two ends and the expansion sleeve 62 in the middle. The second grouting pipe section 4-2 is made of PVC hard plastic materials, all pipe sections are communicated with each other to form a uniform inner diameter, and an external thread is arranged at one end of each pipe while an internal thread is arranged at the other end of each pipe section for combined connection of the pipe sections. One section is the minor diameter section in the middle part of second slip casting pipe section 4-2, and the cover is equipped with the rubber cover that resets on the minor diameter section, and the setting of minor diameter section is used for restricting the slip of rubber cover that resets. And the overall outer diameter of the second grouting pipe section 4-2 is reduced after the rubber reset sleeve 42 is installed, so that the isolation capsule sleeve 6 can be conveniently sleeved in a subsequent process.

Connecting a liquid inlet pipe of a vacuum suction device with a built-in gun barrel 7 in a vacuum pipe 2, wherein the gun head 7 is positioned in the vacuum pipe section 5 at the bottom of a hole, and the gun heads 71 sequentially retreat towards the end of the hole and are sequentially positioned in each vacuum pipe section 5 respectively; in each vacuum pipe section 5, a closed space is formed between the two isolation pistons 72 and the section, provided with the vent holes 51, of the vacuum pipe section 5, a liquid inlet pipe of the vacuum pumping and discharging barrel 8 is connected with the built-in gun barrel 7, the vacuum pump 82 is started to pump and discharge, the vacuum negative pressure is controlled to be about 1MPa according to the indication number of the negative pressure meter 83, and the position of the gun head 71 is communicated with the surrounding rock through the vent holes 51 and the isolation net 52. The surrounding rock at the grouting hole of the section forms a vacuum negative pressure source, clean water output by the gun head 71 is guided to flow in a single direction, meanwhile, water flow is utilized to wrap the clean water, and some fine particles pass through the separation net 52 to be sucked into the built-in gun barrel 7 and finally flow into the vacuum exhaust barrel 8, a plurality of water flow channels are formed in the surrounding rock, and the water flow channels are further enlarged and unobstructed along with continuous loss of the fine particles in the surrounding rock.

The water flowing into the reservoir 81 through the inlet valve 84 is focused through the observation window 86, and when the water flow is relatively clear and does not contain fine particles such as silt, and the pumped water flow exceeds 1/2 of the injection water flow, a sufficiently clear water flow channel is formed in the stratum.

During the operation, the observation window 86 is used for observing, if the water level in the liquid storage barrel 81 exceeds 2/3, the pumping operation is suspended, the liquid discharge valve 85 is opened to discharge water and silt, then the liquid discharge valve 85 is closed, and the pumping operation is resumed.

Claims

1. A vacuum suction apparatus for staged sectional tunnel curtain grouting, comprising:

the vacuum pumping and discharging barrel (8), the vacuum pumping and discharging barrel (8) comprises a liquid storage barrel (81), which is a vertically placed steel sealing barrel and is used for temporarily storing pumping and discharging liquid; a vacuum pump (82) and a negative pressure meter (83) are arranged at the upper end of the liquid storage barrel (81);

the upper part and the lower part of the side wall of the liquid storage barrel (81) are respectively provided with a liquid inlet pipe and a liquid outlet pipe which are communicated with the inner cavity of the barrel, and a liquid inlet valve (84) is arranged on the liquid inlet pipe; a drain valve (85) is arranged on the drain pipe; when water is injected to wash the surrounding rock, the liquid inlet pipe is connected with the rear end of a built-in gun barrel (7), and water flow and fine particles are pumped into the liquid storage barrel (81).

2. A vacuum suction device for stepwise segmented tunnel curtain grouting according to claim 1, characterised in that each of said built-in gun tubes (7) comprises:

the connecting pipe (73) is of a multi-section detachably connected pipe body structure, is inserted into the corresponding pipe, has the front end facing the pipe bottom, and can move back and forth in each pipe;

the gun head (71) is a hard pipe body and is detachably arranged at the front end of the connecting pipe (73); a section of the front end of the tube body is solid and closed, and a plurality of communicating holes (75) are formed in the tube body at the middle section;

the two isolation pistons (72) are sleeved at the front end and the rear end of the gun head (71) at intervals, the outer diameter of each isolation piston is consistent with the inner diameter of the pipe in which the isolation piston is inserted, and the isolation pistons are tightly attached to the pipe wall so as to seal the pipe section between the isolation pistons (72) into a closed space.

3. The vacuum pumping apparatus for stepwise sectional type tunnel curtain grouting according to claim 2, wherein an observation window (86) is provided on a side wall of the liquid storage barrel (81) in a region where the liquid inlet pipe is located, for observing the color, shape and flow rate of the liquid flowing into the barrel from the liquid inlet valve (84), and the height of the liquid level in the barrel.