A grouting reinforcement device for the middle part of a shield connection and a construction method thereof

Abstract

The present invention relates to a grouting reinforcement device for the middle part of a shield connection and a construction method thereof, wherein the reinforcement device comprises an isolation support assembly, comprising a plurality of groups of dome-shaped reinforcement beams arranged in a ring array in the rock and soil body around the tunnel, wherein the dome-shaped reinforcement beam is composed of a metal rod pre-embedded and installed in the middle part of the reinforcement beam body; a vibration reduction mechanism for weakening the vibration transmitted through the dome-shaped reinforcement beam; a reinforcement mechanism comprising a plurality of groups of high-pressure grouting pipes pre-embedded and installed in the rock and soil body around the tunnel below both sides of the dome-shaped reinforcement beam, and a plurality of drainage pipes pre-embedded and installed in the lower middle part of the dome-shaped reinforcement beam; an ultrasonic vibration mechanism, through which the vibration is transmitted to the rock and soil body around the tunnel, and during the vibration process, the external high-pressure grouting equipment drives cement slurry into the gap of the rock and soil body around the tunnel. The construction process and quality controllability of the present invention are strong, and a stable and safe reinforcement area can be effectively formed.

Description

Technical Field

[0001] The invention relates to the technical field of shield butt joint middle part reinforcement, in particular to a grouting reinforcement device for the shield butt joint middle part and a construction method thereof. Background Art

[0002] With the development of urbanization and the increase in urban building density, the domestic large-diameter shield tunnels have increasingly strong requirements for the pursuit of efficient and safe construction and long-distance tunnel projects. If only one-way shield machines are used for excavation construction to construct long-distance tunnels, not only will the main body of the shield machine and the reliability of the construction be high, but it will also be difficult to achieve the effect of shortening the construction period. Therefore, the application of shield docking technology to solve the problem of long-distance tunnel construction can meet construction needs, and this technology is highly favored in the field of tunnel engineering.

[0003] In the traditional shield tunnel docking construction, the stability of the surrounding rock soil at the docking surface is usually taken into consideration. Most of the existing practices are: docking at hard rock. If docking at soft soil layers, the docking surface needs to be frozen or pre-grouted. The freezing method and pre-grouting are temporary reinforcements, and their integrity and stability are relatively poor. There is also the problem that the grouting effect and the freezing effect are difficult to measure. Therefore, there will be safety issues when working on the air surface between the shield machines. In foreign shield docking projects, a special new shield machine structure is used to drive a circle of steel casing into the middle of the shield docking to ensure the stability of the central docking air surface. However, such a shield machine has a special structure and high procurement costs, and it is difficult to promote its use.

[0004] Therefore, the research purpose of the present invention is to design a grouting reinforcement device and a construction method for the middle part of the shield connection, which has strong controllability of construction process and quality and can effectively form a stable and safe reinforcement area. Summary of the invention

[0005] In response to the technical problems existing in the above-mentioned prior art, the present invention provides a grouting reinforcement device for the middle part of shield joint and a construction method thereof, which can effectively solve the technical problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is:

[0007] A grouting reinforcement device for the middle part of a shield butt joint, comprising:

[0008] An isolation support assembly is pre-buried in the rock and soil around the tunnel, and the isolation support assembly includes a plurality of groups of dome-shaped reinforcement beams arranged in a circular array in the rock and soil around the tunnel, and the dome-shaped reinforcement beams are composed of metal rods pre-buried and installed in the middle of the reinforcement beam body;

[0009] A vibration reduction mechanism, disposed inside the dome-shaped reinforcement beam, for reducing vibration transmitted through the dome-shaped reinforcement beam;

[0010] The reinforcement mechanism comprises a plurality of high-pressure grouting pipes pre-buried in the rock and soil body around the tunnel below both sides of the dome reinforcement beam, and a plurality of drainage pipes pre-buried in the lower middle part of the dome reinforcement beam, wherein the high-pressure grouting pipes are connected to the discharge end of the external high-pressure grouting equipment; the cement slurry is filled into the gaps of the rock and soil body around the tunnel through the high-pressure grouting pipes to form a cement slurry reinforcement area;

[0011] The ultrasonic vibration mechanism comprises a support plate supported and installed on the surface of the rock and soil body around the tunnel between a group of high-pressure grouting pipes, and corresponding ultrasonic transducers are fixedly installed on the bottom sides of the support plates, and the ultrasonic transducers are respectively connected to corresponding ultrasonic generators; the vibration generated by the ultrasonic transducers is transmitted to the rock and soil body around the tunnel through the support plates, and during the vibration process, the external high-pressure grouting equipment drives cement slurry into the gaps of the rock and soil body around the tunnel until continuous cement slurry is sprayed out at the drain pipe, and the high-pressure grouting pipes correspondingly arranged on both sides of the drain pipe stop grouting.

[0012] Each group of dome-shaped reinforcement beams comprises two dome-shaped reinforcement beams arranged in an X shape, and a group of two dome-shaped reinforcement beams are arranged in different heights.

[0013] The reinforcing beam body is formed after the cement slurry solidifies.

[0014] The vibration reduction mechanism comprises a guide hole arranged in the middle of the metal rod, and corresponding sealing plates are respectively welded and closed at both ends of the guide hole, and a plurality of corresponding vibration reduction damping particles are respectively compacted, filled and installed in the guide hole between the sealing plates.

[0015] A plurality of isolation plates are installed in the guide hole at intervals, and the peripheries of the isolation plates are respectively abutted against the hole walls of the guide hole.

[0016] The isolation plate member comprises an isolation plate body and an annular reinforcement portion integrally formed and connected to the periphery of the isolation plate body. The cross section of the annular reinforcement portion is in a trapezoidal shape with a narrow inner portion and a wide outer portion.

[0017] The vibration-reducing damping particles are aluminum-based spherical particles.

[0018] A construction method for a shield tunneling middle grouting reinforcement device comprises the following specific construction steps:

[0019] S1, prefabricate the metal rod;

[0020] S2, drilling holes on the shield machine shell according to the construction drawing, installing high-pressure grouting pipes and drain pipes at the corresponding positions of the holes, and drilling in and out of the casing at the corresponding positions of the two ends of the dome-shaped reinforcement beam;

[0021] S3, drilling a hole in the rock and soil around the tunnel along the trajectory of the dome reinforcement beam by means of a horizontal directional drill, the horizontal directional drill is drilled along the drilling casing, and a grouting guide pipe is installed at the rear side of the horizontal directional drill, and as the horizontal directional drill is drilled, the grouting guide pipe enters the borehole;

[0022] S4, after the drilling is completed, the horizontal directional drill is drilled out along the drill casing, and after the horizontal directional drill is removed, a metal rod is fixed at the end of the grouting guide pipe;

[0023] S5, the drilled casing is sealed, and only the through hole through which the metal rod passes is retained, and cement slurry is pumped into the corresponding borehole through the grouting guide pipe. As the cement slurry is injected, the grouting guide pipe is gradually withdrawn from the corresponding borehole and the metal rod is pulled into the middle of the cement slurry. After the grouting guide pipe leaves the borehole, the drilled casing is also sealed to form the dome-shaped reinforcement beam.

[0024] S6, repeating steps S2-S5 until the isolation support assembly is completely embedded in the rock and soil around the tunnel;

[0025] S7, after the cement slurry strength of the dome-shaped reinforcement beam of the isolation support assembly reaches 100%, the support plate of the ultrasonic vibration mechanism is pressed tightly against the surface of the rock and soil body around the tunnel, the vibration operation is started, and the external cement slurry is injected into the gap of the rock and soil body around the tunnel through the external high-pressure grouting equipment under the vibration environment;

[0026] S8, until continuous cement slurry is sprayed out from the drain pipe, the high-pressure grouting pipes correspondingly arranged on both sides of the drain pipe stop grouting;

[0027] S9: When the strength of the cement slurry injected into the cracks of the rock and soil around the tunnel reaches 100%, the construction is completed.

[0028] Advantages of the present invention:

[0029] 1) The present invention uses a number of dome-shaped reinforcement beams arranged in a circular array in the rock and soil around the tunnel to form a local reinforcement area in the middle of the shield connection; on this basis, cement slurry is filled into the gaps in the rock and soil around the tunnel through external high-pressure grouting equipment to form a cement slurry reinforcement area. In this way, a structurally stable reinforcement area can be formed in the middle of the shield connection, and this reinforcement area is more stable and safe than traditional frozen soil or advanced grouting construction, and has better integrity, adding a new solution for the reinforcement of the soil in the middle of the shield connection.

[0030] 2) The dome-shaped reinforcement beam of the present invention is composed of a metal rod pre-embedded in the middle of the reinforcement beam body to ensure that the dome-shaped reinforcement beam has sufficient strength, thereby further improving the stability and safety of the reinforcement area; on this basis, the present invention further adds a vibration reduction mechanism inside the dome-shaped reinforcement beam, which can be used to reduce the vibration transmitted through the dome-shaped reinforcement beam to prevent the rock and soil around the tunnel from collapsing due to the intervention of vibration; the present invention can further introduce an ultrasonic vibration mechanism to perform grouting operations under an ultrasonic vibration environment, thereby greatly improving the grouting efficiency and grouting effect, thereby ensuring the overall controllability of the construction process and quality of the present invention, thereby effectively forming a stable and safe reinforcement area.

[0031] 3) Each group of dome-shaped reinforcement beams of the present invention comprises two dome-shaped reinforcement beams arranged in an X shape, and a group of two dome-shaped reinforcement beams are arranged in different heights to ensure that the dome-shaped reinforcement beams can be evenly arranged in the cement slurry reinforcement area, thereby further ensuring that the present invention can form a structurally stable reinforcement area in the middle of the shield joint.

[0032] 4) The vibration reduction mechanism of the present invention comprises a guide hole arranged in the middle of the metal rod, and the two ends of the guide hole are respectively closed and welded with corresponding sealing plates, and the guide holes between the sealing plates are respectively compacted and filled with a plurality of corresponding vibration reduction damping particles. Through the hollow setting of the metal rod, the vibration reduction damping particles are filled in place without occupying or changing the original structure of the dome-shaped reinforcement beam. Under the effect of friction energy consumption between the vibration reduction damping particles, the vibration transmitted through the dome-shaped reinforcement beam is effectively weakened, thereby ensuring that the present invention has sufficient practical effect.

[0033] 5) Since the setting of the guide hole will cause the strength of the metal rod to be reduced, for this reason, the present invention further installs a plurality of isolation plates at intervals in the guide hole. During the filling process of the damping particles for vibration reduction, after each quantitative filling of the damping particles for vibration reduction, an isolation plate is pushed into the guide hole by a corresponding tool. Under the action of the isolation plate, the metal rod is effectively maintained to have sufficient strength, thereby further ensuring that the present invention has a sufficient practical effect.

[0034] 6) The overall construction process and quality of the present invention are highly controllable, and the operation difficulty is relatively low, which meets the requirements of modern engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention.

[0036] Figure 2 It is a cross-sectional view of the present invention.

[0037] Figure 3 for Figure 2A partial enlarged view of part A.

[0038] Figure 4 It is a schematic structural diagram of the dome-shaped reinforcement beam of the present invention.

[0039] Figure 5 It is a structural schematic diagram of a metal rod member of the present invention having a guide hole in the middle thereof.

[0040] Figure 6 This is a schematic diagram of a structure in which the middle part of a metal rod is filled with damping particles for vibration reduction.

[0041] Figure 7 It is a schematic structural diagram of the isolation plate of the present invention.

[0042] In the attached drawings: rock and soil mass 1 around the tunnel, dome-shaped reinforcement beam 2, reinforcement beam body 201, metal rod 202, vibration reduction mechanism 3, guide hole 301, sealing plate 302, damping particles for vibration reduction 303, reinforcement mechanism 4, high-pressure grouting pipe 401, drain pipe 402, ultrasonic vibration mechanism 5, support plate 501, ultrasonic transducer 502, isolation plate 6, isolation plate body 601, annular reinforcement part 602. DETAILED DESCRIPTION

[0043] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments in conjunction with the accompanying drawings:

[0044] Embodiment 1

[0045] refer to Figure 1-7 , a grouting reinforcement device for the middle part of a shield butt joint, comprising:

[0046] An isolation support assembly is pre-buried in the rock and soil body 1 around the tunnel, and the isolation support assembly comprises a plurality of groups of dome-shaped reinforcement beams 2 arranged in a circular array in the rock and soil body 1 around the tunnel, and the dome-shaped reinforcement beam 2 is composed of a metal rod 202 pre-buried in the middle of a reinforcement beam body 201;

[0047] A vibration reduction mechanism 3 is arranged inside the dome-shaped reinforcement beam 2 and is used to reduce the vibration transmitted through the dome-shaped reinforcement beam 2;

[0048] The reinforcement mechanism 4 comprises a plurality of high-pressure grouting pipes 401 pre-buried and installed in the rock mass 1 around the tunnel below both sides of the dome reinforcement beam 2, and a plurality of drain pipes 402 pre-buried and installed in the lower middle part of the dome reinforcement beam 2, wherein the high-pressure grouting pipes 401 are connected to the discharge end of the external high-pressure grouting equipment; the cement slurry is filled into the gap of the rock mass 1 around the tunnel through the high-pressure grouting pipes 401 to form a cement slurry reinforcement area;

[0049] The ultrasonic vibration mechanism 5 comprises a support plate 501 supported and installed on the surface of the rock mass 1 around the tunnel between a group of high-pressure grouting pipes 401, and corresponding ultrasonic transducers 502 are fixedly installed on the bottom sides of the support plates 501, and the ultrasonic transducers 502 are connected to corresponding ultrasonic generators respectively; the vibration generated by the ultrasonic transducers 502 is transmitted to the rock mass 1 around the tunnel through the support plate 501, and during the vibration process, the external high-pressure grouting equipment drives cement slurry into the gaps in the rock mass around the tunnel until continuous cement slurry is sprayed out from the drain pipe 402, and the high-pressure grouting pipes 401 correspondingly arranged on both sides of the drain pipe 402 stop grouting.

[0050] The present invention forms a local area reinforcement in the middle of the shield connection by interposing several groups of dome reinforcement beams 2 arranged in a circular array in the rock and soil body 1 around the tunnel; on this basis, cement slurry is filled into the gaps of the rock and soil body 1 around the tunnel through external high-pressure grouting equipment to form a cement slurry reinforcement area. In this way, a structurally stable reinforcement area can be formed in the middle of the shield connection, and the reinforcement area is more stable and safe than traditional frozen soil or advanced grouting construction, adding a new solution for the reinforcement of the soil in the middle of the shield connection.

[0051] The dome-shaped reinforcement beam 2 of the present invention is composed of a metal rod 202 pre-embedded in the middle of the reinforcement beam body 201 to ensure that the dome-shaped reinforcement beam 2 has sufficient strength, thereby further improving the stability and safety of the reinforcement area; on this basis, the present invention further adds a vibration reduction mechanism 3 inside the dome-shaped reinforcement beam 2, which can be used to weaken the vibration transmitted through the dome-shaped reinforcement beam 2 to prevent the rock and soil body 1 around the tunnel from collapsing due to the intervention of vibration; the present invention can further introduce an ultrasonic vibration mechanism 5 to perform grouting operations under an ultrasonic vibration environment, thereby greatly improving the grouting efficiency and grouting effect, thereby ensuring the overall controllability of the construction process and quality of the present invention, thereby effectively forming a stable and safe reinforcement area.

[0052] Each set of dome-shaped reinforcement beams 2 includes two dome-shaped reinforcement beams arranged in an x-shape, and a set of two dome-shaped reinforcement beams are arranged in a high and low position. The reinforcement beam body 201 is formed by solidifying cement slurry. This ensures that the dome-shaped reinforcement beams 2 can be evenly arranged in the cement slurry reinforcement area, thereby further ensuring that the present invention can form a structurally stable reinforcement area in the middle of the shield joint.

[0053] The vibration reduction mechanism 3 comprises a guide hole 301 arranged in the middle of the metal rod 202, and the two ends of the guide hole 301 are respectively welded with corresponding sealing plates 302, and a plurality of corresponding vibration reduction damping particles 303 are respectively compacted and filled in the guide hole 301 between the sealing plates 302. Through the hollow setting of the metal rod 202, the vibration reduction damping particles 303 are filled in place without occupying or changing the original structure of the dome-shaped reinforcement beam 2, and under the friction energy consumption between the vibration reduction damping particles 303, the vibration transmitted through the dome-shaped reinforcement beam 2 is effectively weakened, thereby ensuring that the present invention has a sufficient practical effect.

[0054] A plurality of isolation plates 6 are installed at intervals in the guide hole 301, and the peripheries of the isolation plates 6 are respectively abutted against the hole walls of the guide hole 301. The isolation plate 6 comprises an isolation plate body 601 and an annular reinforcement portion 602 integrally formed and connected to the periphery of the isolation plate body 601, and the cross section of the annular reinforcement portion 602 is arranged in a trapezoidal shape with a narrow inner side and a wide outer side.

[0055] Since the setting of the guide hole will cause the strength of the metal rod 202 to be reduced, for this reason, the present invention further installs a plurality of isolation plates 6 at intervals in the guide hole 301. During the filling process of the vibration-reducing damping particles 303, after each quantitative filling of the vibration-reducing damping particles, an isolation plate 6 is pushed into the guide hole 301 by a corresponding tool. Under the action of the isolation plate 6, the metal rod 202 is effectively maintained to have sufficient strength, thereby further ensuring that the present invention has sufficient practical effects.

[0056] In this embodiment, the isolation plate 6 is assembled in the guide hole 301 of the metal rod 202 by interference fit. In this embodiment, the vibration reduction damping particles 303 are aluminum-based spherical particles.

[0057] Embodiment 2:

[0058] A construction method for the shield tunneling middle grouting reinforcement device as described in the first embodiment above comprises the following specific construction steps:

[0059] S1, prefabricate the metal rod 202;

[0060] S2, drilling holes on the shield machine shell according to the construction drawing, and installing the high-pressure grouting pipe 401 and the drain pipe 402 at the corresponding positions of the holes, and drilling in and out the casing at the corresponding positions of the two ends of the dome-shaped reinforcement beam 2;

[0061] S3, drilling a hole in the rock mass 1 around the tunnel along the trajectory of the dome reinforcement beam 2 by means of a horizontal directional drill, the horizontal directional drill drills along the drill casing, and a grouting guide pipe is installed at the rear side of the horizontal directional drill, and as the horizontal directional drill drills, the grouting guide pipe enters the borehole;

[0062] S4, after the drilling is completed, the horizontal directional drill is drilled out along the drill casing, and after the horizontal directional drill is removed, the metal rod 202 is fixed at the end of the grouting guide pipe;

[0063] S5, the drilled casing is sealed, and only the through hole through which the metal rod 202 passes is retained, and cement slurry is pumped into the corresponding borehole through the grouting guide pipe. As the cement slurry is injected, the grouting guide pipe is gradually withdrawn from the corresponding borehole and the metal rod 202 is pulled into the middle of the cement slurry. After the grouting guide pipe leaves the borehole, the drilled casing is also sealed to form the dome-shaped reinforcement beam 2;

[0064] S6, repeating steps S2-S5 until the isolation support assembly is completely embedded in the rock and soil body 1 around the tunnel;

[0065] S7, after the cement slurry strength of the dome-shaped reinforcement beam 2 of the isolation support assembly reaches 100%, the support plate 501 of the ultrasonic vibration mechanism 5 is pressed tightly against the surface of the rock and soil body 1 around the tunnel, the vibration operation is started, and the external cement slurry is injected into the gap of the rock and soil body 1 around the tunnel through the external high-pressure grouting equipment under the vibration environment;

[0066] S8, until continuous cement slurry is sprayed out from the drain pipe 402, the high-pressure grouting pipes 401 correspondingly arranged on both sides of the drain pipe 402 stop grouting;

[0067] S9, when the strength of the cement slurry injected into the cracks of the rock and soil mass 1 around the tunnel reaches 100%, the construction is completed.

[0068] The overall construction process and quality of the invention are highly controllable, and the operation difficulty is relatively low, which meets the requirements of modern engineering construction.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A grouting reinforcement device for the middle part of a shield connection, characterized in that: include: An isolation support assembly is pre-buried in a rock mass (1) around a tunnel, the isolation support assembly comprising a plurality of groups of dome-shaped reinforcement beams (2) arranged in a ring array in the rock mass (1) around the tunnel, the dome-shaped reinforcement beams (2) being composed of a metal rod (202) pre-buried in the middle of a reinforcement beam body (201); A vibration reduction mechanism (3) is arranged inside the dome-shaped reinforcement beam (2) and is used to reduce vibration transmitted through the dome-shaped reinforcement beam (2); The reinforcement mechanism (4) comprises a plurality of groups of high-pressure grouting pipes (401) pre-buried and installed in the rock mass (1) around the tunnel below both sides of the dome reinforcement beam (2), and a plurality of drainage pipes (402) pre-buried and installed in the lower middle part of the dome reinforcement beam (2), wherein the high-pressure grouting pipes (401) are connected to the discharge end of an external high-pressure grouting device; cement slurry is filled into the gaps in the rock mass (1) around the tunnel through the high-pressure grouting pipes (401) to form a cement slurry reinforcement zone; The ultrasonic vibration mechanism (5) comprises a support plate (501) supported and installed on the surface of a rock mass (1) around a tunnel between a group of high-pressure grouting pipes (401), corresponding ultrasonic transducers (502) being fixedly installed on the bottom sides of the support plates (501), and the ultrasonic transducers (502) are connected to corresponding ultrasonic generators. The vibration generated by the ultrasonic transducers (502) is transmitted to the rock mass (1) around the tunnel through the support plates (501). During the vibration process, external high-pressure grouting equipment injects cement slurry into the gaps in the rock mass around the tunnel until continuous cement slurry is ejected from the drain pipes (402), and the high-pressure grouting pipes (401) correspondingly arranged on both sides of the drain pipes (402) stop grouting.

2. A grouting reinforcement device for the middle part of a shield connection according to claim 1, characterized in that: Each group of dome-shaped reinforcement beams (2) comprises two dome-shaped reinforcement beams arranged in an X shape, and a group of two dome-shaped reinforcement beams are arranged in different heights.

3. A grouting reinforcement device for the middle part of a shield connection according to claim 2, characterized in that: The reinforcing beam body (201) is formed by solidifying cement slurry.

4. A grouting reinforcement device for the middle part of a shield connection according to claim 3, characterized in that: The vibration reduction mechanism (3) comprises a guide hole (301) arranged in the middle of the metal rod (202), the two ends of the guide hole (301) are respectively closed and welded with corresponding sealing plates (302), and a plurality of corresponding vibration reduction damping particles (303) are respectively compacted, filled and installed in the guide hole (301) between the sealing plates (302).

5. A grouting reinforcement device for the middle part of a shield connection according to claim 4, characterized in that: A plurality of isolation plates (6) are installed at intervals in the guide hole (301), and the peripheries of the isolation plates (6) respectively abut against the hole walls of the guide hole (301).

6. A grouting reinforcement device for the middle part of a shield connection according to claim 5, characterized in that: The isolation plate member (6) comprises an isolation plate body (601) and an annular reinforcement portion (602) integrally formed and connected to the periphery of the isolation plate body (601); the cross section of the annular reinforcement portion (602) is in the shape of a trapezoid that is narrow inside and wide outside.

7. A grouting reinforcement device for the middle part of a shield connection according to claim 6, characterized in that: The vibration reduction damping particles (303) are aluminum-based spherical particles.

8. A construction method for the shield butt joint middle grouting reinforcement device as claimed in claim 7, characterized in that: The following specific construction steps are included: S1, prefabricating the metal rod (202); S2, drilling holes on the shield machine shell according to the construction drawing, installing high-pressure grouting pipes (401) and drain pipes (402) at the corresponding positions of the holes, and drilling in and out of casings at corresponding positions of the two ends of the dome-shaped reinforcement beam (2); S3, drilling a hole in the rock mass (1) around the tunnel along the trajectory of the dome reinforcement beam (2) by means of a horizontal directional drill, the horizontal directional drill drilling along the drilling casing, and installing a grouting guide pipe at the rear side of the horizontal directional drill, and as the horizontal directional drill drills, the grouting guide pipe enters the borehole; S4, after the drilling is completed, the horizontal directional drill is drilled out along the drill casing, and after the horizontal directional drill is removed, a metal rod (202) is fixed at the end of the grouting guide pipe; S5, the drilled casing is sealed, leaving only the through hole through which the metal rod (202) passes, and cement slurry is pumped into the corresponding borehole through the grouting guide pipe. As the cement slurry is injected, the grouting guide pipe is gradually withdrawn from the corresponding borehole and the metal rod (202) is pulled into the middle of the cement slurry. After the grouting guide pipe leaves the borehole, the drilled casing is also sealed to form the dome-shaped reinforcement beam (2); S6, repeating steps S2-S5 until the isolation support assembly is completely pre-buried in the rock and soil mass (1) around the tunnel; S7, after the cement slurry strength of the dome-shaped reinforcement beam (2) of the isolation support assembly reaches 100%, the support plate (501) of the ultrasonic vibration mechanism (5) is pressed tightly against the surface of the rock and soil body (1) around the tunnel, the vibration operation is started, and the external cement slurry is injected into the gap of the rock and soil body (1) around the tunnel through the external high-pressure grouting equipment under the vibration environment; S8, until continuous cement slurry is sprayed out from the drain pipe (402), the high-pressure grouting pipes (401) correspondingly arranged on both sides of the drain pipe (402) stop grouting; S9, when the strength of the cement slurry driven into the cracks of the rock and soil mass (1) around the tunnel reaches 100%, the construction is completed.

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