Deep-buried tunnel drill hole gushing water high-pressure plugging structure and construction method thereof

Abstract

The invention discloses a deep-buried tunnel drilling water burst high-pressure plugging structure and a construction method thereof.The structure comprises a water stopping assembly, a water guiding assembly, a grouting assembly, a plugging assembly and a lifting assembly, a drilling hole communicates with a tunnel, the water stopping assembly is arranged in the drilling hole, and the water guiding assembly is arranged in the drilling hole; the water guiding assembly, the grouting assembly and the plugging assembly are arranged in the tunnel and connected with the water stopping assembly, and the lifting assembly is arranged in the tunnel. By means of the structure, holes in different states can be blocked, and the success rate of vertical or inclined hole blocking is ensured. Meanwhile, drainage is conducted in the drill hole through the water guide assembly, then the plugging assembly is used for stopping gushing water in the drill hole, finally, grouting consolidation is conducted through the grouting assembly to seal the side wall of the drill hole, high-pressure plugging can be rapidly conducted on the gushing water of the drill hole, the plugging and sealing duration is short, the water stopping effect is good, and the construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure plugging of high-water gushing in tunnels, and in particular relates to a high-pressure plugging structure for water gushing in a deep-buried tunnel borehole and a construction method thereof. Background Art

[0002] During the construction of a hydropower station, due to the needs of hub layout, it is often necessary to arrange water diversion tunnels, drainage tunnels, traffic tunnels and other buildings. Tunnels in the western region are buried deep and groundwater is well developed. During the tunnel excavation process, water gushing is often encountered during drilling, and the gushing water needs to be blocked to ensure the structural safety and construction safety of the cavern. At present, water gushing in deep buried tunnels is often blocked by grouting around the drilling hole, which takes a long time and has a general blocking effect. Therefore, a device and method that can speed up the blocking are needed.

[0003] Patent document with announcement number CN119244313A discloses a ground negative pressure feeding system for blocking water inrush in deep buried tunnels. The hole is sealed by injecting aggregate, but it is difficult to use this method to block when the hole is inclined or vertical.

[0004] The patent document with the announcement number CN115163183A discloses a method for blocking water inflow in a tunnel. First, a concrete cushion is poured at the bottom of the tunnel and a drainage ditch is reserved at the lower side of the concrete cushion. Then, drainage holes are drilled around the tunnel wall and connected to the drainage ditch with a drainage pipe. Then, grouting holes are drilled around the drainage holes and grouting materials are injected. After the drainage pipe stops flowing and the grouting materials in the grouting holes flow backward, the grouting holes are blocked. Then, a second lining sleeve and a grouting pipe for connecting the through hole on the side wall of the second lining sleeve with the drainage ditch are buried in the tunnel. Concrete is poured between the second lining sleeve and the tunnel wall. After the concrete reaches 75% of the design strength, grouting materials are injected into the drainage ditch through the grouting pipe to block the drainage ditch on the lower side of the grouting pipe. This method requires setting multiple channels in the lining and operating them separately. The present application can directly block water inflow in the tunnel quickly, which has a better effect. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a deep-buried tunnel borehole water gushing high-pressure plugging structure and a construction method thereof.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a deep-buried tunnel borehole water gushing high-pressure plugging structure, which includes a water-stopping component, a water-guiding component, a grouting component, a plugging component and a lifting component. The borehole is connected to the tunnel, the water-stopping component is arranged in the borehole, the water-guiding component, the grouting component and the plugging component are arranged in the tunnel and connected to the water-stopping component, and the lifting component is arranged in the tunnel.

[0008] Preferably, the water-stop assembly includes a water-stop plug and water-stop cotton wool, the water-stop cotton wool is arranged at the port of the borehole connecting the tunnel, the water-stop plug is connected to the water-stop cotton wool on the inner side of the borehole, a sedimentation tank is arranged at the bottom of the tunnel, and a fixed bracket is arranged on the tunnel.

[0009] Preferably, the plugging assembly comprises a plugging pipe, a grouting pipe and a first storage tank, the plugging pipe penetrates the water-stopping assembly and extends into the borehole, and the plugging pipe is connected to the first storage tank through the grouting pipe.

[0010] Preferably, a switch valve and a high-pressure plugging pump are provided on the grouting pipe, and the plugging pipe is connected to the grouting pipe via a bayonet wire joint.

[0011] Preferably, the grouting assembly comprises a grouting pipe, a first connecting pipe, a grouting pump and a second storage tank, the grouting pipe passes through the water-stop assembly and extends into the borehole, the grouting pipe is connected to the grouting pump through the first connecting pipe, and the grouting pump is connected to the second storage tank.

[0012] Preferably, the grouting pipe is connected to the grouting pump via a snap-on wire joint, and a switch valve is provided on the connecting pipe between the grouting pump and the second storage tank.

[0013] Preferably, the water guide assembly includes a water guide pipe and a second connecting pipe, the water guide pipe is connected to the second connecting pipe via a snap-on threaded joint, the water guide pipe penetrates the water-stop assembly and extends into the drilled hole, and a pressure gauge and a switch valve are provided on the second connecting pipe.

[0014] A construction method for a deep-buried tunnel borehole water gushing high-pressure plugging structure comprises the following steps:

[0015] S1: Pre-treat the borehole, and the construction personnel are lifted to the borehole through the lifting assembly;

[0016] S2: Install a water stop plug in the drilled hole, and respectively set a water guide pipe, a grouting pipe and a plugging pipe on the water stop plug, and set a water stop cotton wool on the outer end of the water stop plug;

[0017] S3: The high-pressure water in the borehole is first drained to the sedimentation tank through the water pipe. After the grouting pipe, plugging pipe and water-stopping cotton wool are installed, the switch valve on the second connecting pipe is closed to stop the water diversion and drainage;

[0018] S4: Start the high-pressure plugging pump and inject water-fast setting material into the borehole for plugging;

[0019] S5: inject cement mortar through the grouting pipe to consolidate the borehole;

[0020] S6: When the pressure gauge reading drops to 0, the tunnel borehole water seepage is sealed.

[0021] Preferably, the quick-setting material when exposed to water is quick-setting water-break glass, and the highest point of the plugging pipe in the borehole is higher than the groundwater level.

[0022] The beneficial effects of the present invention are:

[0023] The structure of the present invention can block holes in different states, ensuring the success rate of vertical or inclined hole blocking. At the same time, the water guide component is used to drain the borehole, and then the blocking component is used to stop the water in the borehole. Finally, the grouting component is used to grout and consolidate the side wall of the borehole. The present invention can quickly block the water in the borehole with high pressure, with a short blocking time, good water stopping effect, and save construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the steel flower tube of the present invention;

[0026] In the figure: 1-drilling hole, 2-sealing pipe, 3-grouting pipe, 4-water guide pipe, 5-water stop plug, 6-water stop cotton wool, 7-snap-on joint with thread, 8-grouting pipe, 9-fixing bracket, 10-pressure gauge, 11-switch valve, 12-grouting pump, 13-second storage tank, 14-high-pressure sealing pump, 15-first storage tank, 16-sedimentation tank, 17-groundwater level line, 18-lifting assembly, 19-tunnel, 31-first connecting pipe, 41-second connecting pipe, 3-1-steel flower pipe. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0028] Example:

[0029] like Figure 1 , 2 As shown, a deep-buried tunnel borehole water gushing high-pressure plugging structure includes a water-stopping component, a water-guiding component, a grouting component, a plugging component and a lifting component 18. The borehole 1 is connected to the tunnel 19, the water-stopping component is arranged in the borehole 1, the water-guiding component, the grouting component, and the plugging component are arranged in the tunnel 19 and connected to the water-stopping component, and the lifting component 18 is arranged in the tunnel 19.

[0030] The water stop assembly includes a water stop plug 5 and a water stop cotton 6. The water stop cotton 6 is arranged at the port of the borehole 1 connecting the tunnel 19. The water stop plug 5 is connected to the water stop cotton 6 and is located on the inner side of the borehole 1. A sedimentation tank 16 is arranged at the bottom of the tunnel 19. A fixing bracket 9 is arranged on the tunnel 19 for fixing the grouting pipe 8, the first connecting pipe 31 and the second connecting pipe 41. The water stop plug 5 can be made of rubber. The sedimentation tank 16 is used to store the water discharged from the water pipe 4, and the discharged water can be reused after sedimentation.

[0031] The plugging assembly includes a plugging pipe 2, a grouting pipe 8 and a first storage tank 15. The plugging pipe 2 penetrates the water-stopping assembly and extends into the borehole 1. The plugging pipe 2 is connected to the first storage tank 15 through the grouting pipe 8. The first storage tank 15 is arranged in the tunnel 19. The plugging pipe 2 adopts a steel flower pipe 3-1, and a plurality of through holes are arranged on the steel flower pipe 3-1. The aperture of the through hole is not less than 1 cm, and the spacing between the through holes is not more than 10 cm, so as to facilitate the output of the water-fast setting material. The grouting pipe 8 adopts a rubber hose. The first storage tank 15 is used to store the water-fast setting material.

[0032] The grouting pipe 8 is provided with a switch valve 11 and a high-pressure plugging pump 14 , and the plugging pipe 2 is connected to the grouting pipe 8 via a snap-on wire joint 7 .

[0033] The grouting assembly includes a grouting pipe 3, a first connecting pipe 31, a grouting pump 12 and a second storage tank 13. The grouting pipe 3 penetrates the water-stopping assembly and extends into the borehole 1. The grouting pipe 3 is connected to the grouting pump 12 through the first connecting pipe 31, and the grouting pump 12 is connected to the second storage tank 13. The second storage tank 13 is used to store cement mortar.

[0034] The grouting pipe 3 is connected to the grouting pump 12 through a snap-on wire joint 7, and a switch valve 11 is provided on the connecting pipe between the grouting pump 12 and the second storage tank 13.

[0035] The water guide assembly includes a water guide pipe 4 and a second connecting pipe 41, the water guide pipe 4 is connected to the second connecting pipe 41 through a snap-on wire joint 7, the water guide pipe 4 passes through the water stop assembly and extends into the borehole 1, a pressure gauge 10 and a switch valve 11 are arranged on the second connecting pipe 41, and one end of the second connecting pipe 41 is located above the sedimentation tank 16. The water guide pipe 4 is made of PVC pipe or steel pipe, and the second connecting pipe 41 is made of rubber hose.

[0036] A construction method for a deep-buried tunnel borehole water gushing high-pressure plugging structure comprises the following steps:

[0037] S1: Pre-processing the borehole 1, the construction personnel are lifted to the borehole 1 by the lifting assembly 18;

[0038] S2: Install a water stopper 5 in the borehole 1, and respectively set a water guide pipe 4, a grouting pipe 3 and a plugging pipe 2 on the water stopper 5, and set a water stopper cotton wool 6 on the outer end of the water stopper 5;

[0039] S3: The high-pressure water in the borehole 1 is first discharged to the sedimentation tank 16 through the water pipe 4. After the grouting pipe 3, the plugging pipe 2 and the water-stopping cotton wool 6 are installed, the switch valve 11 on the second connecting pipe 41 is closed to stop the water diversion and drainage;

[0040] S4: Start the high-pressure plugging pump 14 to inject water-fast setting material into the borehole 1 for plugging;

[0041] S5: injecting cement mortar through the grouting pipe 3 to perform consolidation grouting on the borehole 1;

[0042] S6: When the reading of the pressure gauge 10 drops to 0, the blocking of the water seepage in the tunnel borehole is completed.

[0043] The water-fast setting material is water-breaking glass that sets quickly when in contact with water, and plays a role in rapid plugging. The highest point of the plugging pipe 2 in the borehole 1 is higher than the groundwater level 17 and close to the upper port of the borehole 1.

[0044] The steps of pre-treating the borehole 1 are as follows: before setting the water stopper 5, the plugging pipe 2, the grouting pipe 3, and the water guide pipe 4, the steel flower pipe 3-1 is set in the borehole 1 for support, and a plurality of through holes are set on the steel flower pipe 3-1, the aperture of the through hole is not less than 1 cm, and the distance between the through holes is not more than 10 cm. After setting the water stopper 5, the steel flower pipe 3-1 is replaced with a steel pipe without holes on the side wall.

Claims

1. A high-pressure plugging structure for water inrush from a deep-buried tunnel borehole, characterized in that: The invention comprises a water stop component, a water guide component, a grouting component, a plugging component and a lifting component (18); a borehole (1) is connected to a tunnel (19); the water stop component is arranged in the borehole (1); the water guide component, the grouting component and the plugging component are arranged in the tunnel (19) and connected to the water stop component; and the lifting component (18) is arranged in the tunnel (19).

2. A deep-buried tunnel borehole water gushing high-pressure plugging structure as claimed in claim 1, characterized in that: The water-stop assembly comprises a water-stop plug (5) and a water-stop cotton wool (6); the water-stop cotton wool (6) is arranged at a port where the borehole (1) is connected to the tunnel (19); the water-stop plug (5) is connected to the water-stop cotton wool (6) and is located on one side of the inner side of the borehole (1); a sedimentation tank (16) is arranged at the bottom of the tunnel (19); and a fixing bracket (9) is arranged on the tunnel (19).

3. A deep-buried tunnel borehole water gushing high-pressure plugging structure as claimed in claim 1, characterized in that: The plugging assembly comprises a plugging pipe (2), a grouting pipe (8) and a first storage tank (15); the plugging pipe (2) penetrates the water-stopping assembly and extends into the borehole (1); the plugging pipe (2) is connected to the first storage tank (15) via the grouting pipe (8).

4. A deep-buried tunnel borehole water gushing high-pressure plugging structure as claimed in claim 3, characterized in that: The grouting pipe (8) is provided with an on-off valve (11) and a high-pressure plugging pump (14), and the plugging pipe (2) is connected to the grouting pipe (8) via a snap-on wire joint (7).

5. A deep-buried tunnel borehole water gushing high-pressure plugging structure as claimed in claim 1, characterized in that: The grouting assembly comprises a grouting pipe (3), a first connecting pipe (31), a grouting pump (12) and a second storage tank (13); the grouting pipe (3) penetrates the water-stopping assembly and extends into the borehole (1); the grouting pipe (3) is connected to the grouting pump (12) via the first connecting pipe (31); and the grouting pump (12) is connected to the second storage tank (13).

6. A deep-buried tunnel borehole water gushing high-pressure plugging structure as claimed in claim 5, characterized in that: The grouting pipe (3) is connected to the grouting pump (12) via a snap-on threaded joint (7), and a switch valve (11) is provided on the connecting pipe between the grouting pump (12) and the second storage tank (13).

7. A deep-buried tunnel borehole water gushing high-pressure plugging structure as claimed in claim 1, characterized in that: The water guide assembly comprises a water guide pipe (4) and a second connecting pipe (41); the water guide pipe (4) is connected to the second connecting pipe (41) via a snap-on threaded joint (7); the water guide pipe (4) penetrates the water stop assembly and extends into the borehole (1); and a pressure gauge (10) and a switch valve (11) are provided on the second connecting pipe (41).

8. A construction method for a deep-buried tunnel borehole water gushing high-pressure plugging structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Pre-processing the borehole (1), and the construction personnel are lifted to the borehole (1) by the lifting assembly (18); S2: Install a water stopper (5) in the drill hole (1), and respectively arrange a water guide pipe (4), a grouting pipe (3) and a plugging pipe (2) on the water stopper (5), and arrange water stopper cotton wool (6) at the outer end of the water stopper (5); S3: The high-pressure water in the borehole (1) is first discharged to the sedimentation tank (16) through the water guide pipe (4). After the grouting pipe (3), the plugging pipe (2), and the water-stopping cotton wool (6) are installed, the switch valve (11) on the second connecting pipe (41) is closed to stop the water diversion and drainage; S4: starting the high-pressure plugging pump (14) to inject water-fast setting material into the borehole (1) for plugging; S5: injecting cement mortar through the grouting pipe (3) to perform consolidation grouting on the borehole (1); S6: When the reading of the pressure gauge (10) drops to 0, the water seepage in the tunnel borehole is sealed.

9. The construction method of a deep-buried tunnel borehole water gushing high-pressure plugging structure according to claim 8, characterized in that: The water-fast setting material is fast setting water-break glass, and the highest point of the plugging pipe (2) in the borehole (1) is higher than the underground water level (17).

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