A grouting repairing device suitable for secondary lining of a tunnel and a construction method thereof

Abstract

The application discloses a grouting repairing device suitable for secondary lining of a tunnel and a construction method thereof, which comprises: a grouting pipe which is a hollow structure with one end being open and the other end being closed, is coaxially clamped in a grouting hole which is in communication with a hollow cavity and a concrete surface of the secondary lining and is arranged with the open end being directed to an inner end of the grouting hole; a grouting inlet pipe which is in communication with the closed end of the grouting pipe at one end and is in communication with an output end of a grouting machine at the other end; an air pipe which is arranged with one end being inside the hollow cavity and the other end being outwardly penetrated through the grouting pipe and being in communication with an output end of an air pump; and a fastening device which is fixed outside the closed end of the grouting pipe and is arranged for limiting the relative displacement between the air pipe and the grouting pipe. According to the sealing condition of the hollow cavity in the secondary lining of the tunnel, different air pump working modes are selected for pretreatment of the defects, the internal and external air pressure balance in the grouting process is realized, and therefore the hollow cavity in the secondary lining of the tunnel is rapidly and effectively grouted and repaired.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel secondary lining concrete construction. More particularly, the present application relates to a grouting repair device suitable for tunnel secondary lining and a construction method thereof. BACKGROUND

[0002] Tunnel secondary lining construction generally pours concrete by mold construction. Due to poor construction exhaust, uneven contact surface between the formwork and the primary support, and other reasons, multiple cavities are easily caused in the secondary lining structure. These cavities may be in an independent sealed state or in a non-sealed state of mutual communication. In order to ensure the stability of the tunnel support, drilling and grouting method is usually used to repair these cavities. Due to the limitation of tunnel structure and geological environment, when grouting construction is carried out on the secondary lining construction surface, the problem of grout not flowing smoothly into the cavity often occurs. In order to avoid the above problems, the traditional drilling and grouting repair method is to drill multiple grouting holes on the surface of the secondary lining concrete until the grouting is smooth. This traditional grouting method does not consider the cavity shape and does not check the ventilation of the cavity. There are problems such as repeated drilling, excessive damage to the surface of the secondary lining concrete, and the like. At the same time, the integrity of the secondary lining concrete support is damaged, the grouting effect is poor, the construction efficiency is low, and the overall stability of the tunnel support structure is greatly affected.

[0003] In order to solve the above problems, a grouting repair device suitable for tunnel secondary lining and a construction method thereof need to be designed to improve the repair effect of the internal cavity of the secondary lining while ensuring the construction efficiency. SUMMARY

[0004] The purpose of the present application is to provide a grouting repair device suitable for tunnel secondary lining and a construction method thereof. According to the measured sealing condition of the cavity in the tunnel secondary lining, different air pump working modes are selected for pretreatment of the defects, air pressure balance is realized during grouting, and rapid and effective grouting repair of the internal cavity of the tunnel secondary lining is achieved.

[0005] In order to achieve these purposes and other advantages according to the present application, a grouting repair device suitable for tunnel secondary lining is provided, comprising:

[0006] A grouting pipe, which is a hollow structure with one end open and the other end closed, is coaxially clamped in the grouting hole communicating the cavity and the surface of the secondary lining concrete, and the open end is arranged towards the inner end of the grouting hole.

[0007] A grouting pipe, which is a hollow structure with one end open and the other end closed, is coaxially clamped in the grouting hole communicating the cavity and the surface of the secondary lining concrete, and the open end is arranged towards the inner end of the grouting hole.

[0008] An air pipe is arranged inside the cavity, and the other end of the air pipe is arranged outside the outlet pipe and connected with the output end of the air pump;

[0009] A fastening device is arranged outside the closed end of the outlet pipe and used to limit the relative displacement between the air pipe and the outlet pipe.

[0010] Preferably, the grouting repair device for the secondary lining of the tunnel comprises an inlet pipe, which penetrates through the outer sidewall of the outlet pipe from one side and is connected with the inside of the closed end of the outlet pipe, and the axis of the inlet pipe is perpendicular to the axis of the outlet pipe, and the outer radius of the inlet pipe is equal to the distance from the axis of the inlet pipe to the end face of the closed end of the outlet pipe.

[0011] Preferably, the grouting repair device for the secondary lining of the tunnel further comprises a guide pipe, which is coaxially arranged inside the outlet pipe and has the same length as the outlet pipe, one end of the guide pipe is fixedly connected with the sidewall of the open end of the outlet pipe through a connecting rod, and the other end of the guide pipe is fixedly connected with the end face of the closed end of the outlet pipe and connected with the outside; the air pipe is slidably connected with the outlet pipe through the guide pipe.

[0012] Preferably, the grouting repair device for the secondary lining of the tunnel further comprises a blocking cover, which is arranged on the opening of the inner end of the air pipe and abuts against the inner end of the cavity, the outer diameter of the blocking cover is greater than the inner diameter of the guide pipe, and a plurality of air holes are arranged on the sidewall of the blocking cover in a spaced manner and connected with the inside of the cavity and the air pipe.

[0013] Preferably, the grouting repair device for the secondary lining of the tunnel comprises an inner sleeve, which is a hollow conical structure penetrating along the axial direction and sleeved on the outside of the air pipe, the narrow end of the inner sleeve is fixedly connected with the outer end of the guide pipe and connected with the guide pipe, and a plurality of notches are arranged on the outer sidewall of the wide end of the inner sleeve in a circumferential direction in a spaced manner, and any notch is connected with the inside and outside of the inner sleeve; an outer sleeve, which is a sleeve structure penetrating along the axial direction and sleeved on the outside of the inner sleeve, and the inner diameter of the outer sleeve is equal to the outer diameter of the narrow end of the inner sleeve.

[0014] Preferably, the grouting repair device for the secondary lining of the tunnel further comprises a sealing ring, which is coaxially sleeved on the outer sidewall of the outlet pipe and seals the gap between the outlet pipe and the grouting hole.

[0015] Preferably, the grouting repair device for the secondary lining of the tunnel comprises an inlet pipe, which is connected with the output end of the grouting machine through the pump pipe, and the outer end of the air pipe is connected with the output end of the air pump through the airflow pipe.

[0016] The application further provides a construction method of the grouting repair device for the secondary lining of the tunnel, which comprises the following steps:

[0017] S1, drilling a grouting hole on the surface of the secondary lining concrete of the tunnel with a proven defect, so that the grouting hole communicates with the cavity at the defect;

[0018] S2, assembling a grouting repair device suitable for the secondary lining of the tunnel, inserting the open end of the grouting pipe of the grouting repair device into the grouting hole and fixing the grouting hole through a sealing ring;

[0019] S3, upending the air pipe, so that the anti-blocking cover at the inner end of the air pipe abuts against the inner end of the cavity, and then using a fastening device to fix the air pipe relative to the grouting pipe;

[0020] S4, connecting the output end of the air pump with the outer end of the air pipe through the airflow pipe, closing the outer end of the grouting pipe, and then starting the air pump to pressurize the cavity and judging the sealing condition of the cavity through the reading of the air pressure gauge on the air pump;

[0021] S5, selecting different working modes of the air pump according to the sealing condition of the cavity to pretreat the cavity, so that the internal and external pressures of the cavity reach a balanced state;

[0022] S6, connecting the output end of the grouting machine with the outer end of the grouting pipe through the pump grouting pipe, and then opening the grouting machine to continuously pressurize and grout the cavity from the outside to the inside through the grouting pipe;

[0023] S7, stopping grouting when the output end pressure of the grouting machine starts to rise, and after the slurry in the cavity is initially cured, the air pipe is first pulled out of the cavity, then the grouting repair device suitable for the secondary lining of the tunnel is pulled out as a whole, and a grouting plug is used to close the grouting hole, thereby completing the grouting repair construction of the cavity at the defect.

[0024] Preferably, in the construction method of the grouting repair device suitable for the secondary lining of the tunnel, in S5, the working modes of the air pump include an air suction mode and an air supply mode, when the cavity is in a sealed state in S4, the air suction mode is adopted to suck air in the cavity, so that the internal pressure is reduced to the external atmospheric pressure; when the cavity is in a non-sealed state in S4, the air supply mode is adopted to inflate the cavity, so that the internal pressure is increased to the external atmospheric pressure.

[0025] Preferably, in the construction method of the grouting repair device suitable for the secondary lining of the tunnel, in S5, when the air pump adopts the air supply mode, the closed state of the outer end of the grouting pipe is first released, then the air pump is opened to purge the cavity, the dust and concrete particles in the cavity are discharged through the grouting pipe, then the outer end of the grouting pipe is re-closed, and the air pump continues to supply air to pressurize the cavity until the internal pressure of the cavity is increased to the external atmospheric pressure.

[0026] The present application at least includes the following beneficial effects:

[0027] 1. The grouting repair device for the secondary lining of a tunnel of the present application is provided with a slurry outlet pipe and a vent pipe that are mutually sleeved, can be inserted into a defect with a cavity in the secondary lining concrete, checks the sealing condition of the cavity in the secondary lining through the vent pipe in cooperation with the air pump, and selects a corresponding air pump operation mode (air suction, air supply) to pre-treat the cavity to balance the air pressure inside and outside the cavity, and then cooperates the grouting machine, the slurry inlet pipe and the slurry outlet pipe to repair the cavity in the secondary lining, effectively reduces the generation of bubbles in the cavity during grouting, ensures that the slurry can fill the cavity during grouting, and thus realizes rapid and effective grouting repair of the cavity in the secondary lining of the tunnel.

[0028] 2. The cooperation structure of the vent pipe and the air pump can provide a sweeping function for the cavity in the secondary lining through the air supply mode, balance the air pressure inside and outside the cavity according to the actual sealing condition of the cavity to ensure the subsequent grouting effect, and also can sweep and remove dust and small concrete particles in the cavity in advance before grouting, further improving the grouting repair effect, and thus ensuring the stability of the overall concrete support structure.

[0029] Other advantages, objects and features of the present application will be apparent from the following description, and will be understood by those skilled in the art through a study of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The overall structure of a grouting repair device for the secondary lining of a tunnel according to an embodiment of the present application is shown in the figure.

[0031] Figure 2 The internal connection structure of the fastening device in the above embodiment is shown in the figure.

[0032] Figure 3 The A-A cross-sectional structure of the inner sleeve in the above embodiment is shown in the figure.

[0033] Figure 4 The flowchart of the construction method of the grouting repair device for the secondary lining of a tunnel in the above embodiment is shown in the figure.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1. slurry inlet pipe; 2. slurry outlet pipe; 3. sealing ring; 4. vent pipe; 5. anti-blocking cover; 6. fastening device; 7. connecting rod; 8. air pump; 9. air flow pipe; 10. grouting machine; 11. pump slurry pipe; 12. inner sleeve; 13. outer sleeve. DETAILED DESCRIPTION

[0036] The present application will be further described in detail below with reference to the accompanying drawings.

[0037] It should be noted that the experimental methods described in the following embodiments are conventional methods, and the reagents and materials are commercially available unless otherwise specified. In the description of the present application, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] As shown in Figures 1-4 The present application provides a grouting repair device suitable for secondary lining of a tunnel, comprising:

[0039] A grout outlet pipe 2, which is a hollow structure with one end open and the other end closed, is coaxially clamped in the grouting hole that communicates the hollow and the surface of the secondary lining concrete, and the open end is arranged towards the inner end of the grouting hole;

[0040] A grout inlet pipe 1, one end of which communicates with the closed end of the grout outlet pipe 2, and the other end communicates with the output end of a grouting machine 10;

[0041] An air pipe 4, one end of which is arranged inside the hollow, and the other end passes outwards through the grout outlet pipe 2 and communicates with the output end of an air pump 8;

[0042] A fastening device 6, which is fixed outside the closed end of the grout outlet pipe 2 and is arranged to limit the relative displacement between the air pipe 4 and the grout outlet pipe 2.

[0043] In the above technical solution, after the tunnel secondary lining concrete layer is detected by using conventional concrete flaw detection equipment such as a geological radar or an ultrasonic flaw detector, and the position of a defect (a cavity) is found out, a grouting hole is drilled on the surface of the secondary lining concrete, which is in communication with the cavity at the corresponding defect, and the grouting hole can be drilled along the radial direction of the arch shape of the secondary lining layer or adjusted according to the actual situation of the tunnel construction. The grouting repair device of the application can be directly installed in the grouting hole after assembly, wherein the open end of the grout outlet pipe is sleeved inside the grouting hole and is clamped and fixed with the grouting hole, that is, the open end of the grout outlet pipe is arranged opposite to the cavity at the defect, and the closed end of the grout outlet pipe extends out of the grouting hole and is in communication with the grout inlet pipe, so that a grouting channel formed by the grout inlet pipe and the grout outlet pipe is formed between the grouting machine and the cavity to be repaired. The inside of the grout outlet pipe is further sleeved with an air pipe, which is arranged in the full length section of the grout outlet pipe and extends out of the end of the grout outlet pipe at both ends. The inner end of the air pipe extends into the cavity through the open end of the grout outlet pipe, and the outer end of the air pipe extends out of the closed end of the grout outlet pipe and is in communication with the output end of the air pump. The air pipe is relatively closed in the process of passing through the grout outlet pipe, that is, the connection between the air pipe and the closed end of the grout outlet pipe is relatively sealed, so that the grout in the grout outlet pipe does not leak out of the connection. Thus, a gas channel composed of the air pipe is formed between the air pump and the cavity. An air pressure gauge is arranged on the air pump to read the air pressure in the output end pipe in real time. The sealing condition of the cavity at the defect can be detected through the gas channel before formal grouting repair, and the internal pressure of the cavity is adjusted according to the detection result, so as to balance the air pressure inside and outside the cavity. The grout from the grouting machine can be smoothly grouted through the grouting channel, and the flow of the grout in the grouting channel is relatively smooth and controllable. The air in the original grouting hole (grout outlet pipe) and the cavity is reversely discharged outward through the inner end opening of the air pipe during the grouting process (the connection between the outer end of the air pipe and the air pump is released at this time), which effectively reduces the generation of air bubbles during the grouting process and improves the grouting repair effect. In addition, a fastening device is fixed to the outside of the closed end of the grout outlet pipe. After the outer end of the air pipe extends out of the closed end of the grout outlet pipe, the fastening device is used to fasten the air pipe from the outside, so as to ensure the relative stability of the connection between the air pipe and the grout outlet pipe and prevent the air pipe from relatively sliding with the grout outlet pipe during the subsequent air passage or grouting process, thereby affecting the smooth progress of the grouting repair construction. The air pipe (and the corresponding fastening device) and the grout inlet pipe, which also have a connection relationship with the closed end of the grout outlet pipe, do not interfere with each other in structure, so as to avoid mutual influence during grouting, air passage or fastening.

[0044] In the present embodiment, as Figure 1As shown, the setting grouting hole is a vertical perforation, which is drilled from the lower to the upper tunnel secondary lining concrete surface and communicates with the cavity inside, and the corresponding grouting repair device for tunnel secondary lining is inserted into the grouting hole from the lower to the upper, wherein the open end of the grouting pipe is clamped in the grouting hole, the air pipe penetrates into the closed end of the grouting pipe from the bottom, and after penetrating out of the top opening of the grouting pipe, it extends into the cavity, the grouting pipe and the grouting pipe are both made of steel material, and the outside is in the form of a circular tube, and the two are connected by welding at the connection to ensure the stability of the slurry flow; the fastening device is fixed at the bottom of the grouting pipe and can limit and fix the air pipe from the outside. Before starting the formal grouting repair, first check the sealing state of the cavity, at this time the whole grouting repair device is equivalent to be blocked in the grouting hole, and the cavity can only communicate with the outside through the air pipe, start the air pump to pump air into the cavity at a uniform speed, and maintain for a set time, if the cavity is in a sealed state, the air inlet pressure read from the air pump output end (air pressure gauge) should be smooth and continuous increase; if the cavity is in a non-sealed state, the air inlet pressure read from the air pump output end will fall back or be unstable after increasing to a certain extent in the initial stage, that is, the reading cannot continuously and stably increase; then according to the sealing state of the cavity, the working state of the air pump is selected to switch or maintain to increase / decrease the pressure in the cavity, so that the air pressure inside and outside the cavity is balanced. During grouting repair, start the grouting machine to inject grout into the cavity, and the grout flows out from the top opening of the grouting pipe and fills the cavity from bottom to top. During the above filling process, the gas in the grouting pipe, the grouting pipe and the cavity is discharged in reverse through the air pipe (inner end) located in the cavity (at this time the air pipe is disconnected with the air pump), and after the grout in the cavity is slightly stable, the grouting repair device is pulled out and the grouting hole is blocked with a grout stopper, that is, the repair of the cavity at the defect is completed.

[0045] The application provides a multifunctional, simple and efficient grouting repair device for tunnel secondary lining, which is provided with a grouting pipe and an air pipe which are sleeved with each other, can be inserted into the defect where the cavity exists in the secondary lining concrete, checks the sealing state of the cavity in the secondary lining through the air pipe and the air pump, selects the corresponding air pump working mode (air suction, air supply) to pre-treat the cavity to balance the air pressure inside and outside the cavity, and then carries out grouting repair on the cavity in the secondary lining through the cooperation of the grouting machine, the grouting pipe and the grouting pipe, thereby effectively reducing the generation of bubbles in the cavity during grouting, ensuring that the grout can fill the cavity during grouting, and realizing rapid and effective grouting repair of the cavity in the tunnel secondary lining.

[0046] In another technical solution, the grouting repair device for secondary lining of a tunnel, the grouting inlet pipe 1 penetrates through the outer sidewall of the grouting outlet pipe 2 from one side and communicates with the inside of the closed end of the grouting outlet pipe 2, the axis of the grouting inlet pipe 1 is perpendicular to the axis of the grouting outlet pipe 2, and the outer radius of the grouting inlet pipe is equal to the distance from the axis of the grouting inlet pipe to the end face of the closed end of the grouting outlet pipe. In this embodiment, the grouting inlet pipe communicates with the bottom end (closed end) of the grouting outlet pipe from the side, the pipe bodies at the connection are perpendicular to each other and welded, and the circular arc surface of the sidewall of the grouting outlet pipe is flush with the outer wall of the bottom end of the grouting inlet pipe (at the same horizontal plane), so that when grouting, the slurry can be stably filled into the cavity through the grouting inlet pipe from the bottom of the grouting outlet pipe, which is beneficial to the stable and rapid injection of the slurry, reduces the resistance in the grouting channel, and avoids the interference between the grouting inlet pipe and the fastening device fixed on the bottom of the grouting outlet pipe or the breather pipe penetrating through the bottom end (closed end) of the grouting outlet pipe, thereby optimizing the structural layout of the grouting repair device.

[0047] In another technical solution, the grouting repair device for secondary lining of a tunnel further comprises a guide pipe coaxially arranged in the grouting outlet pipe and equal in length to the grouting outlet pipe, one end of the guide pipe is fixedly connected to the sidewall of the open end of the grouting outlet pipe 2 through a connecting rod 7, the other end is fixedly connected to the end face of the closed end of the grouting outlet pipe and communicates with the outside, and the breather pipe 4 is slidably connected to the grouting outlet pipe 2 through the guide pipe. In the above technical solution, the guide pipe divides the inside of the grouting outlet pipe into two relatively independent spaces, i.e., a space vertically penetrating through the inside of the guide pipe and a three-dimensional annular space between the guide pipe and the sidewall of the grouting outlet pipe, the top end (inner end) of the three-dimensional annular space is open, and the bottom end (outer end) is closed, so that the grouting channel and the gas channel are further isolated without changing the size of the space occupied by the whole grouting repair device, and the breather pipe is easy to install. The top end of the guide pipe and the outer edge of the open end of the grouting outlet pipe are fixedly welded in a cross shape through four connecting rods, the bottom end is fixedly welded to the end face of the closed end of the grouting outlet pipe and is open to the outside at the corresponding end face, and the breather pipe is an elongated hollow pipe, which is arranged in the guide pipe and penetrates out of the end of the guide pipe at both ends. During installation, the relative distance between the inner end (top end) of the breather pipe and the open end of the grouting outlet pipe can be adjusted according to the actual size (depth) of the cavity, i.e., when the cavity is deep, the breather pipe can be relatively slid upward along the guide pipe after loosening the fastening device to limit the breather pipe, so that the end of the breather pipe can enter the deep cavity, and the breather pipe is fixed again after the position is adjusted to ensure the accuracy of the sealing state detection and the exhaust effect during the grouting process; the same is true when the cavity is shallow. In addition, the guide pipe also limits the position of the breather pipe in the grouting pipe in the radial direction, so that the breather pipe extends in the axial direction without being bent by vibration or impact force during the grouting and air intake processes, which further ensures the gas flow efficiency in the gas channel formed by the breather pipe, thereby ensuring the construction efficiency and repair effect of the grouting repair.

[0048] In another technical solution, the grouting repair device for secondary lining of a tunnel further comprises a blockage prevention cover 5 arranged at the inner end opening of the air pipe 4 and abutting against the inner end of the cavity, the outer diameter of the blockage prevention cover 5 is greater than the inner diameter of the guide pipe, and a plurality of air holes are arranged on the side wall of the blockage prevention cover 5 in a spaced manner to communicate the cavity with the inside of the air pipe 4. Specifically, the blockage prevention cover is a hollow cylindrical structure with an open bottom end, which is sleeved on the top (inner end) of the air pipe and communicates with the inside of the air pipe. On one hand, the outer end surface of the top end of the blockage prevention cover can abut against the inner end (top end) of the cavity to facilitate positioning during installation of the air pipe. On the other hand, the blockage prevention cover is a gas-permeable type blockage prevention cover, and the gas from the air pump or the gas in the cavity flows through the air holes on the side wall of the blockage prevention cover. The air holes are fine and dense (the diameter is smaller than the particle size of the concrete particles), which allows the gas to flow through while preventing the concrete particles from entering the inside of the air pipe, effectively preventing the concrete and gravel in the cavity from blocking the gas passage, and avoiding the problem of poor gas flow caused by the direct abutment of the end of the air pipe against the inner end surface of the cavity. In addition, since the outer diameter of the blockage prevention cover is greater than the inner diameter of the guide pipe (i.e., greater than the outer diameter of the air pipe), the air pipe can be effectively prevented from sliding out of the grouting pipe during installation (when the whole grouting repair device is inserted into the grouting hole). The inner wall of the bottom end of the blockage prevention cover is clamped with the outer wall of the top end of the air pipe to facilitate quick installation and removal of the two.

[0049] In another technical solution, the grouting repair device for secondary lining of a tunnel further comprises a blockage prevention cover 5 arranged at the inner end opening of the air pipe 4 and abutting against the inner end of the cavity, the outer diameter of the blockage prevention cover 5 is greater than the inner diameter of the guide pipe, and a plurality of air holes are arranged on the side wall of the blockage prevention cover 5 in a spaced manner to communicate the cavity with the inside of the air pipe 4. Specifically, the blockage prevention cover is a hollow cylindrical structure with an open bottom end, which is sleeved on the top (inner end) of the air pipe and communicates with the inside of the air pipe. On one hand, the outer end surface of the top end of the blockage prevention cover can abut against the inner end (top end) of the cavity to facilitate positioning during installation of the air pipe. On the other hand, the blockage prevention cover is a gas-permeable type blockage prevention cover, and the gas from the air pump or the gas in the cavity flows through the air holes on the side wall of the blockage prevention cover. The air holes are fine and dense (the diameter is smaller than the particle size of the concrete particles), which allows the gas to flow through while preventing the concrete particles from entering the inside of the air pipe, effectively preventing the concrete and gravel in the cavity from blocking the gas passage, and avoiding the problem of poor gas flow caused by the direct abutment of the end of the air pipe against the inner end surface of the cavity. In addition, since the outer diameter of the blockage prevention cover is greater than the inner diameter of the guide pipe (i.e., greater than the outer diameter of the air pipe), the air pipe can be effectively prevented from sliding out of the grouting pipe during installation (when the whole grouting repair device is inserted into the grouting hole). The inner wall of the bottom end of the blockage prevention cover is clamped with the outer wall of the top end of the air pipe to facilitate quick installation and removal of the two. Figure 3The plane structure of the inner sleeve is shown in the bottom view, and two notches are symmetrically arranged at the two sides of the bottom end of the inner sleeve. The initial position of the outer sleeve is sleeved on the upper part (i.e. the narrow end) of the inner sleeve, the inner side of the outer sleeve is a cylindrical structure and the inner diameter is equal to the outer diameter of the narrow end of the outer sleeve, and in the initial position, the outer sleeve can be just fitted and clamped on the outer side of the inner sleeve, at this time the ventilation pipe can still slide freely in the catheter; after the position of the ventilation pipe is adjusted, the outer sleeve is slid axially downward relative to the inner sleeve, and under the restriction of the inner diameter of the outer sleeve, the lower part (the segment provided with the notch) of the inner sleeve will be adaptively contracted inward to press the internal ventilation pipe, that is, the relative fixation of the ventilation pipe is completed. In this embodiment, as shown in Figure 2 The narrow end of the inner sleeve is additionally extended upward by a distance before being connected with the outer end of the catheter, forming a hollow cylindrical structure and being connected with the bottom of the catheter, so that a longer outer sleeve can be adaptively used for connection, and the outer sleeve is sleeved on the outside of the hollow cylindrical structure in the initial state, avoiding the initial compression force of the outer sleeve bottom end on the internal ventilation pipe of the inner sleeve in the initial position due to structural restriction, which affects the adjustment of the height position of the ventilation pipe. In addition, the inner sleeve and the outer sleeve can be connected by smooth surface sliding or continuous thread connection. When the thread connection is adopted, the outer sleeve is rotated clockwise to move downward to tighten the inner sleeve and fix the ventilation pipe, and the outer sleeve is rotated counterclockwise to move upward to loosen the internal ventilation pipe, so as to adjust the position or directly remove it.

[0050] In another technical solution, the grouting repair device suitable for secondary lining of a tunnel further comprises a sealing ring 3 coaxially sleeved on the outer side wall of the grout outlet pipe 2 and sealing the gap between the grout outlet pipe 2 and the grouting hole. The sealing ring is made of rubber material and is used to seal the gap between the grouting hole and the grout outlet pipe to prevent gas or grout from flowing out through the gap and affecting the smooth progress of the grouting repair construction. In this embodiment, the sealing ring is tightly gripped at the connection between the outer end (bottom end) of the grout outlet pipe and the grouting hole, the inner ring surface of the sealing ring is connected with the outer side wall of the grout outlet pipe, the outer ring surface is a tapered surface and is clamped on the inner wall of the grouting hole, so that the overall sealing ring is in the shape of a tapered plug, which is conducive to better sealing the gap between the grouting hole and the grout outlet pipe and improving the stability of the connection between the grout outlet pipe and the grouting hole.

[0051] In another technical solution, the grouting repair device suitable for secondary lining of a tunnel, the grout inlet pipe 1 is communicated with the output end of the grouting machine 10 through the pump grout pipe 11, and the outer end of the ventilation pipe 4 is communicated with the output end of the air pump 8 through the airflow pipe 9. The positions and setting directions of the grout inlet pipe and the ventilation pipe on the overall grouting repair device are relatively fixed, and the pump grout pipe and the airflow pipe are used to connect the grout inlet pipe with the output end (grout outlet) of the grouting machine and to connect the ventilation pipe with the output end of the air pump, respectively. The pump grout pipe and the airflow pipe can be selected as flexible pipes, which are convenient for flexible connection on the construction site.

[0052] The application also provides a construction method of the grouting repair device suitable for the secondary lining of a tunnel.

[0053] S1, drilling a grouting hole on the surface of the concrete of the secondary lining of the tunnel with a proven defect, so that the grouting hole is in communication with the cavity at the defect, and the diameter of the grouting hole is slightly larger than the designed diameter of the grouting pipe 2;

[0054] S2, assembling the grouting repair device suitable for the secondary lining of the tunnel, inserting the opening end of the grouting pipe 2 of the device into the grouting hole and fixing the grouting hole and the grouting pipe through the sealing ring 3, so that the sealing ring fills the gap between the grouting hole and the grouting pipe;

[0055] S3, lifting the air pipe 4 so that the anti-blocking cover 5 (the top surface of the anti-blocking cover 5) at the inner end of the air pipe 4 is in abutment with the inner end (the top end) of the cavity, the axial positioning of the air pipe 4 is completed, and then the air pipe 4 and the grouting pipe 2 are fixed relative to each other (i.e., the outer sleeve 13 and the inner sleeve 12 are screwed relative to each other, the inner sleeve 12 is pressed towards the inner air pipe 4, and the air pipe 4 is locked on the grouting pipe 2) by using the fastening device 6;

[0056] S4, connecting the output end of the air pump 8 and the outer end of the air pipe 4 by using the airflow pipe 9, closing the outer end of the grouting pipe 1, and then starting the air pump 8 to pressurize the cavity (pumping air into the cavity), at this time, the air pump is in the air sending mode, and the sealing condition of the cavity is judged by reading the air pressure on the air pump, so as to check the sealing of the internal defect of the secondary lining;

[0057] Specifically, the air pump is started to pump air into the cavity at a constant speed, and the air pressure at the output end of the air pump (air pressure gauge) is read for a set time, if the cavity is in a sealed state, the air pressure should be smoothly and continuously increased, if the cavity is in a non-sealed state, the air pressure at the output end of the air pump will fall back or fluctuate unstably after increasing to a certain degree in the initial stage, that is, the reading cannot be continuously and stably increased;

[0058] S5, according to the sealing condition of the cavity, selecting different working modes of the air pump to pretreat the cavity, so that the internal and external air pressures of the cavity reach a balanced state;

[0059] S6, connecting the output end of the grouting machine 10 and the outer end of the grouting pipe 1 by using the pump grouting pipe 11, and then opening the grouting machine 10 to continuously pressurize and grout from the outside to the inside (from the bottom to the top) of the cavity through the grouting pipe 2;

[0060] The grouting machine is selected as a conventional pressure-adjustable grouting machine, and a pressure gauge for displaying real-time grouting pressure (slurry pressure of an output pipeline) is further arranged outside the grouting machine. During the use of the grouting machine, the slurry is slowly injected at a small grouting pressure, and overflow of the slurry at interfaces and gaps between various pipes (grouting pipes, slurry outlet pipes, guide pipes, air pipes, pump slurry pipes, air flow pipes, etc.) and between the pipes and grouting holes is checked. After it is confirmed that there is no overflow at the connections and the connections are stable and not loose, the grouting pressure is increased to continuously inject the slurry into the cavity. When it is found that there is slurry leakage at any interface or gap, it is indicated that there is a problem in the installation or operation of the grouting repair device, and the machine needs to be stopped immediately for processing. After the fault is checked and processed, the grouting construction is continued.

[0061] S7, when the output pressure of the grouting machine 10 starts to rise, it is judged that the slurry entering is blocked at this time, that is, the cavity is completely filled, the grouting is stopped, and the grouting pressure is stabilized until the slurry in the cavity is initially set. Then the air pipe 4 is pulled out of the cavity, the grouting repair device suitable for the secondary lining of the tunnel is pulled out quickly as a whole, and the grouting hole is closed by using a grouting plug, that is, the grouting repair construction of the cavity at the defect is completed.

[0062] Wherein, since the air pipe and the anti-blocking cover at the top are in a clamped state, when the air pipe is pulled out, the anti-blocking cover moves downward under the driving of the air pipe and is clamped at the top of the guide pipe, and is automatically separated from the air pipe under the action of external force, avoiding the problem of slurry overflow outside through the guide pipe during the removal of the air pipe. And because the slurry filled in the cavity is in a relatively stable state (beginning to initially set), the anti-blocking cover is stably crimped at the top of the guide pipe under the action of the slurry pressure after moving downward, and can be pulled out together when the whole grouting repair device is pulled out, without affecting the grouting repair effect.

[0063] In another technical solution, the construction method of the grouting repair device suitable for the secondary lining of the tunnel, in S5, the working mode of the air pump includes the air suction mode and the air supply mode. When the cavity measured in S4 is in the sealed state, the air suction mode is used to pump air in the cavity to reduce the internal pressure to the external atmospheric pressure. When the cavity measured in S4 is in the non-sealed state, the air supply mode is used to inflate the cavity to increase the internal pressure to the external atmospheric pressure. Specifically, when selecting different air pump working modes according to the sealing state of the cavity, if the cavity itself is in the sealed state, the previous sealing state check and the air pump-in will cause the air pressure in the cavity to be too high, so the air pump needs to be switched to the air suction mode to reduce the air pressure in the cavity to the external standard atmospheric pressure level, so that the subsequent grouting step can be carried out smoothly and efficiently. If the cavity itself is in the non-sealed state, the non-sealed structure of the cavity itself will cause the internal air pressure to be too low. Since only a certain amount of air needs to be pumped in to determine the air pressure change in the cavity during the sealing state check, it is not enough to increase the air pressure in the cavity to the external air pressure level, so the air supply mode of the air pump needs to be maintained and continuously pressurized until the air pressure in the cavity increases to close to or reaches the external standard atmospheric pressure level. Thus, before the formal grouting repair of the cavity, the air pump and the air channel are used to pretreat the cavity to balance the internal and external air pressures, reduce the internal pressure when the cavity is sealed, and make the external slurry more smoothly and smoothly into the cavity. When the cavity is not sealed, increase the internal pressure so that the slurry in the cavity can spread to a larger range (fill other cavities or interstitial spaces between concrete particles connected with the cavity) to further ensure the effect of grouting repair.

[0064] In another technical solution, in the construction method suitable for the grouting repair device for the secondary lining of a tunnel, when the air pump adopts the air sending mode, the closed state of the outer end of the grout feeding pipe is first released, then the air pump is opened to blow the cavity, the dust and concrete particles in the cavity are discharged through the grout feeding pipe, the outer end of the grout feeding pipe is resealed, and the air pump continues to send air to the cavity to pressurize until the internal pressure of the cavity is increased to the external atmospheric pressure. In the above technical solution, if the cavity is in a non-sealed state measured in S4, it means that there is a gap or loose structure of concrete in the cavity that is connected with other cavities. At this time, the seal of the outer end of the grout feeding pipe can be opened first, the exhaust capacity of the air pump is increased to blow the cavity, the dust and fine concrete particles in the loose part of the cavity and the part connected with the adjacent cavity are blown up and discharged in the reverse direction through the grout feeding pipe, the blowing is continued for a period of time, after the dust or concrete particles are no longer discharged from the outer end of the grout feeding pipe, the outer end of the grout feeding pipe is resealed and the cavity is pressurized. On the one hand, the real-time value displayed by the air pressure gauge in the pretreatment process of S5 can more truly and reliably represent the internal air pressure of the cavity (if there are multiple small gaps, after the pump-in gas is stopped, a period of time is needed for the cavity to react to completely disperse the pump-in gas to each position, and the real-time reading of the air pressure gauge located at the gas input end is not accurate enough); on the other hand, the dust and concrete particles that may block the small gaps are removed, the subsequent grouting process can be more smooth, and the generation of air bubbles during grouting is further avoided, and the grouting repair effect is improved.

[0065] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A construction method of a grouting repair device suitable for a secondary lining of a tunnel, characterized in that, The grouting repair device suitable for tunnel secondary lining comprises: a grout outlet pipe which is a hollow structure with one end open and the other end closed, the grout outlet pipe is coaxially clamped in the grouting hole which is communicated with the cavity and the surface of the secondary lining concrete, and the open end of the grout outlet pipe is arranged towards the inner end of the grouting hole; a grout inlet pipe which is communicated with the closed end of the grout outlet pipe at one end and communicated with the output end of the grouting machine at the other end; an air pipe which is arranged inside the cavity at one end and outwardly penetrates the grout outlet pipe at the other end and is communicated with the output end of the air pump; a fastening device which is fixed outside the closed end of the grout outlet pipe and arranged to limit the relative displacement between the air pipe and the grout outlet pipe; a sealing ring which is coaxially sleeved on the outer sidewall of the grout outlet pipe and closes the gap between the grout outlet pipe and the grouting hole; the grout inlet pipe is communicated with the output end of the grouting machine through a pump pipe, and the outer end of the air pipe is communicated with the output end of the air pump through an air flow pipe; the construction method of the grouting repair device suitable for tunnel secondary lining comprises: S1, drilling a grouting hole on the surface of the tunnel secondary lining concrete which has been proved to have defects, so that the grouting hole is communicated with the cavity at the defect; S2, assembling the grouting repair device suitable for tunnel secondary lining, inserting the open end of the grout outlet pipe into the grouting hole and fixing it with the grouting hole through the sealing ring; S3, lifting the air pipe, making the anti-blocking cover at the inner end of the air pipe abut against the inner end of the cavity, and then using the fastening device to fix the air pipe relative to the grout outlet pipe; S4, connecting the output end of the air pump with the outer end of the air pipe through the air flow pipe, closing the outer end of the grout inlet pipe, and then starting the air pump to pressurize the cavity and judging the sealing condition of the cavity through the reading of the air pressure gauge on the air pump; S5, according to the sealing condition of the cavity, selecting different working modes of the air pump to pretreat the cavity, so that the inner and outer air pressures of the cavity reach a balanced state; S6, connecting the output end of the grouting machine with the outer end of the grout inlet pipe through the pump pipe, and then opening the grouting machine to continuously pressurize and grout into the cavity from the outside to the inside through the grout outlet pipe; S7, stopping grouting when the output end pressure of the grouting machine starts to rise, and after the pressure is stabilized to the initial setting of the grout in the cavity, the air pipe is pulled out from the cavity, the grouting repair device suitable for tunnel secondary lining is pulled out as a whole, and the grout plug is used to close the grouting hole, thus completing the grouting repair construction of the cavity at the defect.

2. The construction method of the grouting repair device suitable for the tunnel secondary lining according to claim 1, characterized in that, The grout inlet pipe penetrates the outer sidewall of the grout outlet pipe at one side and is communicated with the inside of the closed end of the grout outlet pipe, the axis of the grout inlet pipe is perpendicular to the axis of the grout outlet pipe, and the outer radius of the grout inlet pipe is equal to the distance from the axis of the grout inlet pipe to the end face of the closed end of the grout outlet pipe.

3. The construction method of the grouting repair device suitable for the tunnel secondary lining according to claim 1, characterized in that, The grouting repair device suitable for tunnel secondary lining further comprises a guide pipe which is coaxially arranged inside the grout outlet pipe and has the same length as the grout outlet pipe, one end of the guide pipe is fixedly connected with the sidewall of the open end of the grout outlet pipe through a connecting rod, the other end is fixed on the end face of the closed end of the grout outlet pipe and communicated with the outside, and the air pipe is slidably connected with the grout outlet pipe through the guide pipe.

4. The construction method of claim 3, wherein the method is characterized by, The grouting repairing device suitable for the secondary lining of the tunnel further comprises a blockage prevention cover, which is arranged at the opening of the inner end of the ventilation pipe and abuts against the inner end of the cavity, the outer diameter of the blockage prevention cover is greater than the inner diameter of the guide pipe, and a plurality of air holes are arranged on the side wall of the blockage prevention cover at intervals and communicate the cavity with the inside of the ventilation pipe.

5. The construction method of claim 3, wherein the method is characterized by, The fastening device comprises an inner sleeve, which is a hollow conical structure penetrating in the axial direction and is sleeved on the outside of the ventilation pipe, the narrow end of the inner sleeve is fixed on the outer end of the guide pipe and communicates with the outer end of the guide pipe, a plurality of notches are arranged on the outer side wall of the wide end of the inner sleeve at intervals in the circumferential direction, and any notch communicates the inner side and the outer side of the inner sleeve; and an outer sleeve, which is a sleeve structure penetrating in the axial direction and is sleeved on the outside of the inner sleeve, the inner diameter of the outer sleeve is equal to the outer diameter of the narrow end of the inner sleeve.

6. The construction method of the grouting repair device suitable for the tunnel secondary lining according to claim 1, wherein, In S5, the working mode of the air pump includes an air suction mode and an air supply mode, when the cavity is in the sealed state measured in S4, the air suction mode is used to perform air suction on the cavity to reduce the internal pressure to the external atmospheric pressure; when the cavity is in the non-sealed state measured in S4, the air supply mode is used to perform air supply on the cavity to increase the internal pressure to the external atmospheric pressure.

7. The construction method of claim 6, wherein the method is characterized by, In S5, when the air pump uses the air supply mode, the closed state of the outer end of the grouting pipe is first released, then the air pump is opened to blow the cavity, the dust and concrete particles in the cavity are discharged through the grouting pipe, the outer end of the grouting pipe is resealed, and the air pump continues to supply air to the inside of the cavity to pressurize until the internal pressure of the cavity is increased to the external atmospheric pressure.

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