A disassembly-free grouting hole opening method for a shield segment

Abstract

The application discloses a disassembly-free grouting and opening method for a shield segment, which integrates the principle of a gun spike gun into segment opening operation, uses the high-pressure effect of a gun spike to break through a grouting reserved opening area of the shield segment, and solves the high water pressure breakage risk caused by pulling out a drill after traditional grouting hole drilling operation; meanwhile, the grouting pipeline is combined with the gun spike pipeline to form an opening-grouting equipment integrating gun spike opening, single-liquid grouting and double-liquid grouting, the formed device can be recycled multiple times, and each operation is safe and controllable, so that the efficiency of segment grouting and opening is improved, the safety of opening and grouting operation personnel is ensured, and safety and quality guarantee is provided for segment back wall grouting operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunnel engineering, in particular to a disassembly-free grouting and opening method for shield segments. BACKGROUND

[0002] In recent years, the "long, large and deep" cross-river and cross-sea tunnels have developed rapidly. Almost all the super-large diameter cross-river tunnels have encountered problems such as complex geological conditions, shallow overburden, high water pressure and long shield tunneling distance. Shield tunnel construction under complex conditions poses a great challenge to tunnel builders.

[0003] During the secondary grouting process of the shield segment, the segment reserved grouting hole needs to be opened, and then the segment grouting operation can be performed. Influenced by the construction process (multiple joints), cyclic loading in operation, uneven distribution of soil, uneven settlement of the tunnel and the like, under the action of high water head pressure, the safety risk of the shield segment grouting and opening operation is extremely high. When the segment reserved grouting hole is opened, a drill rod needs to be punched through. When the drill is pulled out after the grouting hole is punched through, the high water pressure and other environments outside the segment are likely to generate a high breakthrough pressure, which causes great safety risk to the drill hole operation personnel. At the same time, the sprayed stratum grout greatly affects the appearance quality of the segment, and a certain amount of manpower and material resources are needed to handle it, which reduces the construction efficiency.

[0004] When the hole is opened, the drill rod is likely to hit the grouting hole thread, which damages the grouting head, causes the sealing plug to fail, and easily leaks water. At the same time, in the high water pressure environment and water-rich sand layer operation, a large amount of water and sand are likely to be continuously discharged or sprayed out when the drill hole is pulled out, which poses a great risk to the safety of the construction personnel and the operation efficiency, and in severe cases, endangers the life safety of the operation personnel. SUMMARY

[0005] In view of the above technical problems, the present application provides a disassembly-free grouting and opening method for shield segments, which can realize the opening operation of the shield segment reserved grouting hole without the need for drill pulling-out operation, improve the operation efficiency of the segment grouting and opening, greatly guarantee the life safety of the personnel during the shield grouting and opening operation, and reduce the safety risk during the high water pressure opening operation of the segment.

[0006] In order to achieve the above technical purposes, the present application adopts the following technical means: a disassembly-free grouting opening method of a shield segment, based on a set of devices, the devices comprising: a grouting head connecting pipe, one end of which is connected with a grouting head embedded in the segment; a connecting integrated pipe, one end of which is connected with the other end of the grouting head connecting pipe; a cannon bolt gun, the end of a cannon bolt gun firing pipe on the cannon bolt gun being connected with the other end of the connecting integrated pipe; one side wall of the connecting integrated pipe being connected with a grouting pipe through a grouting pipe opening; a first control valve, connected on the connecting integrated pipe and located between the cannon bolt gun and the grouting pipe opening, used for controlling the opening and closing between the cannon bolt gun and the grouting pipe; a second control valve, connected on the grouting head connecting pipe, used for controlling and blocking the ground water after the grouting hole is penetrated; a third control valve, connected on the grouting pipe, used for controlling the opening and closing of the grouting pipe; a pressure gauge, arranged on the grouting head connecting pipe, used for monitoring the pressure fluctuation of the ground water pressure after the cannon bolt gun penetrates the reserved penetration area of the segment, comprising the following steps: S1, polishing, polishing the reserved wall thickness in the segment grouting hole, the polishing area being to a specified thickness H, and reserving a to-be-penetrated area; S2, connecting the cannon bolt gun with the cannon bolt gun firing pipe, the cannon bolt gun firing pipe with the connecting integrated pipe, the connecting integrated pipe with the grouting head connecting pipe, the grouting head connecting pipe with the grouting head, and the grouting pipe with the connecting integrated pipe; S3, opening the second control valve, closing the third control valve, pressing the cannon bolt gun handle, firing the cannon bolt, the cannon bolt penetrating the reserved penetration area of the segment grouting hole under the high pressure of the gunpowder, immediately closing the second control valve on the grouting head connecting pipe, removing the cannon bolt gun handle and the cannon bolt gun firing pipe, and leaving them for use in the next grouting opening; S4, closing the first control valve on the connecting integrated pipe, opening the third control valve on the grouting pipe, injecting the required single liquid slurry or double liquid slurry, and closing the third control valve on the grouting pipe after the injection is completed; S5, closing the first control valve on the grouting head connecting pipe, removing the connecting integrated pipe and the grouting pipe, and performing the opening and grouting operation of the next grouting hole.

[0007] The pipe diameter of the cannon bolt gun firing pipe on the cannon bolt gun, the pipe diameter of the connecting integrated pipe, and the pipe diameter of the grouting head connecting pipe are the same.

[0008] One side of the pipe wall of the grouting pipe is connected with a water injection pipe, used for flushing the grouting pipe, and the water injection pipe is connected with a fourth control valve.

[0009] If the reserved wall thickness in the segment grouting hole is within 2 cm, the polishing step S1 is omitted.

[0010] The pipe wall of the grouting pipe is connected with a water injection pipe for flushing the grouting pipe, and the water injection pipe is connected with a fourth control valve; in step S4, before grouting, the fourth control valve on the water injection pipe is opened to flush the grouting pipe and the grouting head, and after completion, the fourth control valve on the water injection pipe is closed; after grouting is completed, the third control valve on the grouting pipe is closed, and the fourth control valve on the water injection pipe is opened to flush the grouting pipe and the grouting head.

[0011] In step S1, the grinding operation uses a drilling machine, and a drill rod of the drilling machine is externally sleeved with a sleeve, and the sleeve is used to avoid wear of a thread of the grouting head.

[0012] Beneficial effects: the method for grouting and opening hole of shield segment of the application integrates the principle of the gun bolt gun into the opening hole operation of the segment, and uses the high pressure of the gun bolt to break the shield segment grouting reserved opening hole area, solves the high water pressure breakage risk caused by pulling out the drill after the traditional grouting hole drilling operation; meanwhile, the grouting pipeline and the gun bolt pipeline are combined to form an opening and grouting equipment integrating the gun bolt opening hole, single liquid grouting and double liquid grouting, the formed device can be recycled multiple times, and each operation is safe and controllable, not only improves the efficiency of the segment grouting and opening hole, but also guarantees the safety of the opening and grouting operation personnel, and provides safety and quality guarantee for the segment back grouting operation. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of a grouting and opening hole device for shield segment, wherein 1 is a gun bolt gun handle; 2 is a gun bolt gun handle and a gun bolt gun firing tube connection inner thread; 3 is a gun bolt gun firing tube; 4 is a gun bolt gun firing spring; 5 is a gun bolt gun bolt; 6 is a first control valve; 7 is a connecting integrated pipe; 8 is a pressure gauge; 9 is a fourth control valve; 10 is a water injection pipeline; 11 is a grouting pipe; 12 is a third control valve; 13 is a grouting head; 14 is a segment reserved pre-grinding area; 15 is a segment reserved breakage area; 16 is a segment; 17 is a second control valve; and 18 is a grouting head connecting pipe. DETAILED DESCRIPTION

[0014] In order to better understand the application, the following will be described in detail in combination with the drawings and examples: the direction indicating words involved in the application are all with the ground as the reference system, the longitudinal direction is perpendicular to the ground direction, and the transverse direction is horizontal to the ground direction. The "upper" direction is the outer arc surface direction of the segment, close to the stratum, and the "lower" direction is the inner arc surface direction of the segment, away from the stratum.

[0015] A grouting and opening hole method for shield segment without disassembly, based on a set of devices, Figure 1The utility model provides a kind of schematic diagram for the grouting opening device of disassembly-free of shield segment, including: grouting head connecting pipe 18, one end is connected with grouting head 13 embedded in segment;Integrated pipe 7 is connected with the other end of the grouting head connecting pipe 18;Rifle bolt gun, the end of firing tube is connected with the other end of the integrated pipe 18;One side wall of the integrated pipe 7 is connected with grouting pipe 11 by grouting pipe orifice;First control valve 6 is connected on the integrated pipe 7 and is located between the rifle bolt gun and the grouting pipe orifice, for controlling the opening and closing between rifle bolt gun and grouting pipe;Second control valve 17 is connected on the grouting head connecting pipe 18, for controlling, blocking ground water after grouting hole penetration;Third control valve 12 is connected on the grouting pipe 11, for controlling the opening and closing of grouting pipe;Pressure gauge 8 is arranged on the grouting head connecting pipe 18, for monitoring the pressure fluctuation of stratum water pressure when rifle bolt gun penetrates segment reserved penetration area.When pressure fluctuation is generally detected, it is penetrated, and first control valve 6 and second control valve 17 are closed.When there is pressure fluctuation, first open water injection line 10 or grouting pipe 11, then open second control valve 17, and inject slurry.

[0016] It comprises the following steps: S1, polishing, polishing the reserved wall thickness in segment grouting hole, polishing area to specified thickness H, and reserving the to-be-penetrated area; S2, connecting the rifle bolt gun with the rifle bolt gun firing tube, the rifle bolt gun firing tube with the integrated pipe, the integrated pipe with the grouting head connecting pipe, the grouting head connecting pipe with the grouting head, and the grouting pipe with the integrated pipe; S3, opening the second control valve, closing the third control valve, pressing the rifle bolt gun handle, firing the rifle bolt, and the rifle bolt penetrating the segment grouting hole reserved penetration area under the high pressure of gunpowder, immediately closing the second control valve on the grouting head connecting pipe, removing the rifle bolt gun handle and the rifle bolt gun firing tube, and leaving them for the next grouting opening; S4, closing the first control valve on the integrated pipe, opening the third control valve on the grouting pipe, injecting the required single-liquid slurry or double-liquid slurry, and closing the third control valve on the grouting pipe after injection; S5, closing the first control valve on the grouting head connecting pipe, removing the integrated pipe and the grouting pipe, and performing the next grouting hole opening and grouting operation.

[0017] Further, the pipe diameter of the rifle bolt gun firing tube 3, the pipe diameter of the integrated pipe 7, and the pipe diameter of the grouting head connecting pipe 18 are the same.

[0018] Further, one side of the pipe wall of the grouting pipe 11 is connected with the water injection pipe 10 for flushing the grouting pipe 11, and the fourth control valve 9 is connected on the water injection pipe 10.

[0019] Further, in the step S4, before grouting, the fourth control valve on the water injection pipe is opened to flush the grouting pipe and the grouting head, and after completion, the fourth control valve on the water injection pipe is closed; after injection is completed, the third control valve on the grouting pipe is closed, and the fourth control valve on the water injection pipe is opened to flush the grouting pipe and the grouting head.

[0020] Further, in the step S1, the grinding operation uses a drilling machine, and a sleeve is arranged outside the drill rod of the drilling machine, and the sleeve is used to avoid abrasion of the wire teeth of the grouting head.

Claims

1. A method for non-demolition grouting and opening of a shield segment, based on a set of devices, the devices comprising: The grouting head connecting pipe is connected with the grouting head embedded in the segment at one end; The connecting integrated pipe is connected with the other end of the grouting head connecting pipe at one end; the end of the cannon bolt gun firing pipe on the cannon bolt gun is connected with the other end of the connecting integrated pipe; one side wall of the connecting integrated pipe is connected with the grouting pipe through the grouting pipe opening; the first control valve is connected on the connecting integrated pipe and between the cannon bolt gun and the grouting pipe opening, used for controlling the opening and closing between the cannon bolt gun and the grouting pipe; the second control valve is connected on the grouting head connecting pipe, used for controlling and blocking the ground water after the grouting hole is penetrated; the third control valve is connected on the grouting pipe, used for controlling the opening and closing of the grouting pipe; the pressure gauge is arranged on the grouting head connecting pipe, used for monitoring the pressure fluctuation of the ground water pressure after the cannon bolt gun penetrates the reserved penetration area of the segment, characterized in that the following steps are included: S1, polishing, polishing the reserved wall thickness in the segment grouting hole, the polishing area is to the specified thickness H, and the penetration area is reserved; the connecting integrated pipe (7) is provided with a three-way structure, the first port of which is connected with the cannon bolt gun firing pipe (3), the second port is connected with the grouting head connecting pipe (18), and the third port is connected with the grouting pipe (11) through the grouting pipe opening; S2, the cannon bolt gun is connected with the cannon bolt gun firing pipe, the cannon bolt gun firing pipe is connected with the connecting integrated pipe, the connecting integrated pipe is connected with the grouting head connecting pipe, the grouting head connecting pipe is connected with the grouting head, and the grouting pipe is connected with the connecting integrated pipe; S3, open the second control valve, close the third control valve, press the cannon bolt gun handle, fire the cannon bolt, the cannon bolt penetrates the reserved penetration area of the segment grouting hole under the high pressure of the gunpowder, immediately close the second control valve on the grouting head connecting pipe, remove the cannon bolt gun handle and the cannon bolt gun firing pipe, and leave them for the next grouting opening; S4, close the first control valve on the connecting integrated pipe, open the third control valve on the grouting pipe, inject the required single liquid slurry or double liquid slurry, and close the third control valve on the grouting pipe after the injection is completed; S5, close the second control valve on the grouting head connecting pipe, remove the connecting integrated pipe and the grouting pipe, and perform the next grouting hole opening and grouting operation; In step S3, the ground water pressure fluctuation after the segment is penetrated is monitored in real time through the pressure gauge (8).

2. The method according to claim 1, wherein, The pipe diameter of the cannon bolt gun firing pipe on the cannon bolt gun, the pipe diameter of the connecting integrated pipe and the pipe diameter of the grouting head connecting pipe are the same.

3. The method of claim 1, wherein, If the reserved wall thickness in the segment grouting hole is within 2 cm, the polishing step S1 is omitted.

4. The method of claim 1, wherein, One side of the pipe wall of the grouting pipe is connected with the water injection pipe, used for flushing the grouting pipe, and the fourth control valve is connected on the water injection pipe; In step S4, before grouting, the fourth control valve on the water injection pipe is opened, the grouting pipe and the grouting head are flushed, and the fourth control valve on the water injection pipe is closed after completion; After the injection is completed, the third control valve on the grouting pipe is closed, the fourth control valve on the water injection pipe is opened, and the grouting pipe and the grouting head are flushed.

5. The method of claim 1, wherein, In step S1, the polishing operation uses the drilling machine, a sleeve is arranged outside the drilling rod of the drilling machine, and the sleeve is used for avoiding the abrasion of the thread of the grouting head.

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