阅读说明：本技术 一种隧道衬砌钻孔的涌泥砂防控装置及安装方法 (Mud gushing prevention and control device for tunnel lining drilling and installation method ) 是由 董新平 蔡迎春 晋伟 毋存粮 吴靖江 马清文 陈小羊 纪红亮 陈浩 张鹏 李精昆 于 2021-07-24 设计创作，主要内容包括：本发明公开了一种隧道衬砌钻孔涌泥砂防控装置及安装方法,该装置由喷射系统、封孔塞、护垫、钻头和钻杆组成,喷射系统包括喷射杆钻头、喷射杆、喷射孔、电钻,封孔塞包括膜袋、气腔、塞体、气管、注塑管、网索。本发明封孔塞内置于衬砌迎土侧,利用围岩水土压力和气腔膨胀对封孔塞挤压获得的封孔塞闭合来封堵钻孔涌水(泥)通道,封孔塞为柔性材料,变形能力强,对钻杆的包裹效果好,可实现封堵密贴效果。封孔塞利用盾构隧道管片作为支撑,无需在盾构隧道管片钻固定用膨胀螺丝孔。封孔塞内置气腔和气管,封孔塞的大小可以调节,可在钻孔、停钻、下管等不同阶段进行调节,满足冻结管钻孔施工全过程的风险防控需要。(The invention discloses a device for preventing and controlling mud gushing of a tunnel lining drilling hole and an installation method. The hole sealing plug is arranged in the soil facing side of the lining, the hole sealing plug obtained by extruding the hole sealing plug by utilizing the water and soil pressure of surrounding rock and the expansion of the air cavity is closed to seal a water (mud) gushing channel of a drill hole, the hole sealing plug is made of a flexible material, the deformation capability is strong, the wrapping effect on a drill rod is good, and the sealing and close-fitting effect can be realized. The hole sealing plug utilizes the shield tunnel segment as a support, and an expansion screw hole for fixing is not required to be drilled in the shield tunnel segment. The hole sealing plug is internally provided with an air cavity and an air pipe, the size of the hole sealing plug can be adjusted, the hole sealing plug can be adjusted in different stages of drilling, stopping drilling, pipe descending and the like, and the risk prevention and control requirements of the whole process of freezing pipe drilling construction are met.)

1. The utility model provides a mud gushing sand prevention and control device of tunnel lining drilling which characterized in that: the hole sealing plug comprises a film bag, an air cavity, a plug body, an air pipe, an injection molding pipe and a net cable;

the hole sealing plug is positioned on the soil facing side of the shield tunnel segment, is a short cylindrical hollow ring body and is closely attached to the periphery of a freezing pipe hole, a drill rod passes through the center of the hole sealing plug, an injection molding pipe is arranged in the hole sealing plug to be communicated with the outside, and an air pipe is arranged in an air cavity of the hole sealing plug to be communicated with the outside; net cables are uniformly distributed on the side surface of the hole sealing plug and led out of the drill hole;

the protection pad extends from the hole opening of the freezing pipe to the hole sealing plug, and the drill rod is separated from the hole sealing plug through the protection pad;

the spray rod is of a hollow structure, and the inner cavity is communicated with the spray hole.

2. The device of claim 1 for preventing and controlling mud gushing and sand in a tunnel lining borehole, characterized in that: the hole sealing plug body is formed by solidifying a liquid object injected into the injection pipe.

3. The device of claim 1 for preventing and controlling mud gushing and sand in a tunnel lining borehole, characterized in that: the plug body of the hole sealing plug is a flexible and highly elastic organism.

4. The device of claim 1 for preventing and controlling mud gushing and sand in a tunnel lining borehole, characterized in that: the tail end of the injection rod is connected with an external high-pressure water pipe through a screw thread.

5. The method of installing a mud gushing prevention and control device for a tunnel lining bore hole of any one of claims 1 to 4, wherein: the installation steps are as follows:

step 1: connecting a drill bit of the injection rod to the injection rod, installing the injection rod on an electric drill, drilling a pilot hole on the segment by using the electric drill at the center position of the freezing hole, and continuously drilling to the designed position after the segment is drilled;

step 2: the electric drill is disassembled, the tail part of the injection rod is connected with a high-pressure water pipe, high-pressure water is started, high-pressure water is injected from an injection hole in the top of the injection rod and rotates for a circle, then the injection rod is pulled outwards for 2cm, and the injection rod continues to rotate until the soil body at the position of the hole sealing plug is damaged, so that a cavity or a water cavity is formed;

and step 3: pulling out the spraying rod, fixing the film bag to the top of the spraying rod, and jacking the spraying rod to a preset position in a soil body;

and 4, step 4: the air pipe is utilized to press high-pressure air into the air cavity, so that the hole sealing plug is basically molded, then, organic liquid is injected through the injection pipe so that the plug body of the hole sealing plug is molded, and the plug body expands to seal the pilot hole;

and 5: expanding the pilot hole in the segment range to the size of the freezing pipe by adopting a core drilling machine, and drilling through the segment;

step 6: inserting the protection pad into the hole sealing plug, and fixing the tail expanded end on the tube sheet;

and 7: inserting a freezing hole drilling rod into the protection pad, properly deflating the air cavity through the air pipe to enable the hole sealing plug to contract, and then opening the drill of the freezing hole drilling machine to reach the designed depth;

and 8: drilling is finished, the freezing pipe is inserted into the freezing hole, the air cavity is completely deflated, the sealing plug is completely retracted, the protection pad is removed, the sealing plug is pulled out to the depth range of the pipe piece through the net rope, and the air cavity is inflated by utilizing the air pipe according to the situation of gaps around the sealing plug and the freezing pipe wall, so that the orifice part of the freezing pipe is completely sealed.

Technical Field

The invention relates to the technical field of tunnel lining drilling construction, in particular to a device for preventing water and mud gushing of a drill hole for construction of a freezing pipe, a pipe shed and a small guide pipe of an urban subway shield connecting channel and an installation method thereof.

Background

In order to meet the requirements of safe operation and disaster prevention of urban subways, contact channels are required to be arranged at intervals between every two adjacent subways so as to ensure that people can be rapidly evacuated and escape and rescue personnel can rapidly enter an accident site in emergency situations such as fire disasters.

The artificial stratum freezing method is characterized in that holes are drilled at certain positions on the periphery of an excavation contour line of a contact channel in advance, then a freezing pipe (a thin-wall steel pipe) is buried in each hole, surrounding rocks around the contact channel are frozen into a water-tight bearing body through refrigerant circulation in the freezing pipe, however, in the process of drilling a shield tunnel lining through and the freezing pipe, due to the fact that the stratum is weak, the problems of water burst, mud burst (sand) and the like along the drilled holes are prone to occurring, and even the shield tunnel segment lining is cracked, and the events of stratum subsidence, overlarge pipeline settlement and structure settlement and the like are caused. The existing technology for preventing water burst and mud burst of drill holes mainly adopts the step of installing a hole pipe outside a tunnel lining for fixing a device for preventing the water burst, for example, Li Zhi and the like disclose a device for installing a hole pipe in a high-pressure water burst drill hole (Chinese patent CN201310362Y), Luo Fu and the like disclose a blowout preventer for water burst of drill holes and sand burst (Chinese patent CN205077502U), Panguang and the like disclose a high-pressure high-flow water burst drilling safety system and an installation process thereof (Chinese patent CN 102561977A), and the above patents all need to install the hole pipe on the wall of the tunnel lining. Another method in the prior invention is to arrange a sleeve outside a drill rod, and the sleeve and the tunnel lining are plugged by grouting, for example, Li Shi discloses a grouting plugging device suitable for high-pressure large-flow drilling water burst and a process thereof (Chinese patent CN 104948133A), Yangjia provides a drilling water burst plugging orifice device, which comprises a drainage tube, a slurry filtering bag and a grouting tube (Chinese patent CN 208966260U).

The problem that the underground water channel exists in the process of plugging the drilling through the orifice pipe fixed on the outer wall of the tunnel lining or the sleeve anchored in the lining is as follows: (1) existing specialties are directed to mountain tunnels; (2) the sleeve is fixed mainly by the friction force of the grouting body, and the grouting effect is influenced by more factors, so the sleeve is easy to loosen; (3) aiming at the patent of the orifice pipe of the shield tunnel in the urban area, the orifice pipe is fixed and needs to be punched at a plurality of positions of the shield tunnel lining. Compared with grouting pipe drilling construction of mountain tunnels, the requirement of freezing pipe construction of the connection channel of the subway interval on the prevention and control of mud gushing in the drilling hole is higher, and the main reason is that: (1) the connection channel is constructed in a state that the lining of the segments of the shield tunnel is finished, and the characteristics of the assembled structure, more joints and small rigidity of the shield tunnel determine that once water burst and mud (sand) burst occur in the connection channel construction, the shield structure is easy to crack, sink, even collapse integrally and other safety accidents; (2) the shield tunnel segment lining is a single-layer lining, the thickness is mostly 35cm or 30cm, a deep hole is not allowed to be drilled on the segment to fix the orifice pipe by inserting an expansion screw, and the drilled hole is too shallow, so that the fixation of the orifice pipe is difficult to guarantee. Therefore, when the shield tunnel communication channel, especially the communication channel of a high-permeability stratum (such as a water-rich sand layer and a water-rich sandy gravel stratum) is constructed, how to effectively prevent and control the mud and sand gushing of the drill hole is one of the key points and difficulties in controlling the safety risk of the communication channel.

Disclosure of Invention

The invention aims to solve the safety problems in the construction of a freezing method, a pipe shed and the like of a shield tunnel connecting channel, and provides a water and mud (sand) gushing prevention and control device and an installation method for a tunnel lining drilling process, so that the shield tunnel pipe piece does not need to be drilled everywhere, the installation is firm, the shield tunnel pipe piece is not easy to fall off, the whole drilling process has a good sealing effect, and the drilling safety of a freezing pipe is ensured.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a mud gushing sand prevention and control device of tunnel lining drilling, includes injection system, hole sealing stopper, protection pad, drill bit and drilling rod, and the injection system includes injection pole drill bit, injection pole, jet orifice, electric drill, and the hole sealing stopper comprises membrane bag, air cavity, cock body, trachea, injection molding pipe, net cable.

The hole sealing plug is positioned on the soil facing side of the shield tunnel segment, is a short cylindrical hollow ring body, is closely attached to the periphery of a freezing pipe hole, a drill rod passes through the center of the hole sealing plug, and the plug body of the hole sealing plug is a flexible and high-elasticity organism and is internally provided with an injection molding pipe communicated with the outside;

furthermore, the plug body is formed by solidifying a liquid object injected into the injection molding pipe;

an air pipe is arranged in the air cavity of the hole sealing plug and communicated with the outside;

and net cables are uniformly distributed on the side surface of the hole sealing plug and led out of the drill hole.

The protection pad is a hollow cylinder and is a flexible high elastomer; the tail part of the protection pad is provided with an enlarged part which is stuck to the duct piece; the protection pad extends to the hole sealing plug from the hole opening of the freezing pipe, and the drill rod is separated from the hole sealing plug through the protection pad.

The injection rod is of a hollow structure, and an inner cavity is communicated with the injection hole; after the tail end of the injection rod is separated from the electric drill, the injection rod can be connected with an external high-pressure water pipe through a screw thread.

The installation method of the mud gushing prevention and control device for the tunnel lining drilling hole comprises the following installation steps:

step 1: connecting a drill bit of the injection rod to the injection rod, installing the injection rod on an electric drill, drilling a pilot hole on the segment by using the electric drill at the center position of the freezing hole, and continuously drilling to the designed position after the segment is drilled;

step 2: the electric drill is disassembled, the tail part of the injection rod is connected with a high-pressure water pipe, high-pressure water is started, high-pressure water is injected from an injection hole in the top of the injection rod and rotates for a circle, then the injection rod is pulled outwards for 2cm, and the injection rod continues to rotate until the soil body at the position of the hole sealing plug is damaged, so that a cavity or a water cavity is formed;

and step 3: pulling out the spraying rod, fixing the film bag to the top of the spraying rod, and jacking the spraying rod to a preset position in a soil body;

and 4, step 4: the air pipe is utilized to press high-pressure air into the air cavity, so that the hole sealing plug is basically molded, then, organic liquid is injected through the injection pipe so that the plug body of the hole sealing plug is molded, and the plug body expands to seal the pilot hole;

and 5: expanding the pilot hole in the segment range to the size of the freezing pipe by adopting a core drilling machine, and drilling through the segment;

step 6: inserting the protection pad into the hole sealing plug, and fixing the tail expanded end on the tube sheet;

and 7: inserting a freezing hole drilling rod into the protection pad, properly deflating the air cavity through the air pipe to enable the hole sealing plug to contract, and then opening the drill of the freezing hole drilling machine to reach the designed depth;

and 8: drilling is finished, the freezing pipe is inserted into the freezing hole, the air cavity is completely deflated, the sealing plug is completely retracted, the protection pad is removed, the sealing plug is pulled out to the depth range of the pipe piece through the net rope, and the air cavity is inflated by utilizing the air pipe according to the situation of gaps around the sealing plug and the freezing pipe wall, so that the orifice part of the freezing pipe is completely sealed.

The invention has the beneficial effects that:

(1) the invention is built-in, the sealing plug is built in the soil facing side of the segment, the sealing plug obtained by extruding the sealing plug by utilizing the soil and water pressure of the surrounding rock and the expansion of the air cavity is closed to plug the water (mud) gushing channel of the drill hole, and the water plugging effect is better;

(2) the hole sealing plug is made of flexible materials, has strong deformability and strong wrapping capacity on the drill rod, is easy to realize the sealing effect and has good sealing effect;

(3) the hole sealing plug is internally provided with an air cavity and an air pipe, the size of the hole sealing plug can be adjusted, the hole sealing plug can be adjusted in different stages of drilling, stopping drilling, pipe descending and the like, and the risk prevention and control requirements of the whole process of freezing pipe drilling construction are met.

(4) The shield tunnel segment is used as a supporting foundation, so that the structure is firm and reliable;

(5) the installation process need not to bore the inflation screw hole at the shield segment, can not construct the damage to the segment structure, influences its water-proof effects, durability etc..

Drawings

The following describes an application example of the present invention with reference to the drawings.

FIG. 1 is a structural view of a frozen hole drilling stage of a mud gushing prevention and control device for tunnel lining drilling;

fig. 2 is a structural view of an installation stage of a mud gushing prevention and control device for a tunnel lining drilling.

In the figure: the device comprises an air cavity 1, a plug body 2, a pipe piece 3, a freezing pipe hole 4, a protection pad 5, a drill rod 6, a drill bit 7, an air pipe 8, an injection molding pipe 9, a pilot hole 10, a spray rod 11, a spray hole 12, a membrane bag 13, a net cable 14, a spray rod drill bit 14 and an electric drill 15.

Detailed Description

The invention will be further described with reference to examples in the drawings to which:

the device mainly comprises a jet system, a hole sealing plug, a protective pad 5, a drill bit and a drill rod 6, wherein the jet system comprises a jet rod drill bit 14, a jet rod 10, a jet hole 11 and an electric drill 16, and the hole sealing plug comprises a membrane bag 12, an air cavity 1, a plug body 2, an air pipe 7, an injection molding pipe 8 and a net rope 13.

The method for installing the mud gushing prevention and control device for the tunnel lining drilling hole comprises the following steps:

step 1: pilot hole 9 is drilled. Drilling a pilot hole 9 on the pipe piece 3 by using a jet rod 10 and a jet rod drill bit 14;

step 2: and (4) high-pressure rotary spraying of a soil body. The electric drill 15 is disassembled, the tail part of the injection rod 10 is connected with a high-pressure water pipe, and the soil body where the hole sealing plug is located is sprayed in a rotating mode through the injection hole 11 to form a cavity or a water cavity;

and step 3: the hole-sealing plug membrane bag 12 is in place. Ejecting the membrane bag 12 from the pilot hole 9 into a predetermined position;

and 4, step 4: and (5) forming the hole sealing plug. The air cavity 1 is inflated by an air pipe 7, and the plug body 2 is molded and the pilot hole 9 is sealed by an injection molding pipe 8;

and 5: the pilot hole 9 is reamed. Enlarging the pilot hole 9 to the size of the freezing pipe by using a core drill;

step 6: the pad 5 is inserted in place. And the expanded end of the tail part of the protection pad 5 is stuck on the duct piece 3;

and 7: the freezing pipe holes 4 are drilled. Inserting a freezing hole drill rod 6 into the protection pad 5, contracting and sealing a hole plug through an air pipe 7, and then opening a drill of a freezing hole drilling machine until the depth is designed;

and 8: and pulling back the hole sealing plug. And after drilling, inserting the freezing pipe, completely exhausting the hole sealing plug, removing the protection pad 5, and pulling the hole sealing plug back through the net rope 13 to seal the opening part of the freezing pipe.