Mountain tunnel drilling anti-permeable construction method

Abstract

The invention relates to the technical field of mountain tunnel construction, in particular to the field of mountain tunnel drilling construction, in particular to a mountain tunnel drilling anti-permeable construction method, and solves the problem that in the prior art, due to mountain water leakage during drilling, a drill needs to be withdrawn for secondary plugging, and mountain water is sprayed out. According to the mountain water plugging device, sudden mountain water can be rapidly plugged, the construction progress is guaranteed, a plurality of plugging strips are prepared in advance in a factory, in the drilling construction process, when mountain water leakage occurs, drilling work of a spiral drilling rod is stopped, and the multiple plugging strips are filled into a feeding cavity; and the blocking strip is conveyed to the position close to the drill bit through the feeding cavity, and then the blocking strip is discharged into the hole to block the mountain water leakage point.

Description

Technical Field

[0001] The present invention relates to the technical field of mountain tunnel construction, especially the field of drilling construction for mountain tunnels, and specifically relates to a construction method for preventing water penetration during drilling of mountain tunnels. Background Art

[0002] During the construction of mountain tunnels, rock layers are often encountered. The construction method of those skilled in the art is to first drill holes in the mountain through drilling equipment, and then fill explosive charges in the holes for subsequent construction. Due to the need to fill explosives, there are strict requirements for the diameter and depth of the holes.

[0003] The most commonly used equipment is a drilling rig for drilling, such as a rock mountain drilling machine disclosed in the patent with the publication number CN112523691A. The mountain is drilled through a spiral drill rod. However, some parts of the mountain are rich in a large amount of water. When the drill hole reaches the area rich in mountain water, water will seep out of the drill hole. In order to seal the mountain water, the conventional method is to retreat the drill and then enter again for sealing. Then, a large amount of water will gush out, affecting subsequent construction such as explosive filling, and even requiring re-drilling. Summary of the Invention

[0004] The present invention provides a construction method for preventing water penetration during drilling of mountain tunnels, which solves the problem in the prior art that when water leakage occurs during drilling, it is necessary to retreat the drill and enter again for sealing, resulting in the ejection of mountain water, and can quickly seal the sudden mountain water to ensure the construction progress.

[0005] The present invention is achieved through the following technical solutions: A construction method for preventing water penetration during drilling of mountain tunnels includes the following steps: S10. Prepare several sealing strips in advance in the factory; S20. A feeding cavity is arranged along the axial direction inside the spiral drill rod. The drilling rig enters the site, and the spiral drill rod is connected to the power head of the drilling rig; S30. Measure and set out the drilling position on the mountain and drive in a mark; S40. Start the drilling rig, align the drill bit of the spiral drill rod with the drilling position for drilling construction. While the spiral drill rod drills into the mountain to form a hole, the outer spiral blades on the outside of the spiral drill rod discharge the mountain debris; S50. During the drilling construction, when water leakage occurs in the mountain, stop the drilling work of the spiral drill rod, and fill several sealing strips into the feeding cavity; S60. Transport the sealing strips through the feeding cavity to a position close to the drill bit, and then discharge the sealing strips into the hole to seal the water leakage point of the mountain water.

[0006] Furthermore, the sealing strip is made of sulfoaluminate cement, bentonite, superabsorbent resin, polypropylene fiber, nano-silica, slow-release coagulant and plasticizer.

[0007] Furthermore, the preparation of the sealing strip includes the following steps: S1001. Add sulfoaluminate cement and bentonite to a mixer and mix to form a uniform base material; S1002. Sequentially add superabsorbent resin, polypropylene fiber and nano-silica and mix to form a mixture; S1003. Prepare an aqueous solution of the slow-release coagulant and plasticizer, and synchronously inject the aqueous solution into the mixture in S1002 through a spray system; S1004. After stirring and mixing, form a plastic paste, and extrude the plastic paste through a screw extruder into an initial strip-shaped material; S1005. Steam-cure the initial strip-shaped material, and then naturally dry it until the moisture content ≤ 5% to finally form a sealing strip.

[0008] Furthermore, the shape of the sealing strip is long strip-shaped, and the length of the sealing strip is 20 - 40 cm.

[0009] Furthermore, in step S20, the area between the drill bit and the outer spiral blade is defined as the water seepage monitoring area, and a water seepage monitoring module is provided in advance in the water seepage monitoring area; In step S50, during the drilling construction, when mountain water leakage occurs, the water seepage detection module monitors that water seeps into the hole, and then stops the drilling work of the spiral drill rod.

[0010] Furthermore, the installation of the water seepage monitoring module includes the following steps: S201. Process a sensor groove in the water seepage monitoring area; S202. Install a water immersion sensor in the sensor groove; S203. Assemble a protective cover with grid holes on the sensor groove.

[0011] Furthermore, in step S20, a one-way discharge door is provided in advance in the water seepage monitoring area, and the one-way discharge door communicates with the feeding chamber; In step S60, after the sealing strip enters the feeding chamber, use the conveying method of a shaftless spiral blade to convey the sealing strip to a position close to the drill bit, and then discharge the sealing strip through the one-way discharge door into the hole to seal the mountain water leakage point.

[0012] Furthermore, in step S40, the rotation speed of the spiral drill rod is controlled to 10 - 15 revolutions per minute.

[0013] The beneficial effects achieved by the present invention compared with the prior art are as follows: 1. The present invention provides a construction method for preventing water penetration during drilling of mountain tunnels. When water leakage occurs in the mountain during the drilling construction process, the spiral drill rod stops working, and several sealing strips are filled into the feeding cavity. The sealing strips are conveyed through the feeding cavity to a position close to the drill bit, and then the sealing strips are discharged into the hole to seal the water leakage point of the mountain. This replaces the previous sealing method that requires redrilling and then lowering the pipe again, enabling rapid sealing, high construction efficiency, avoiding the problem of water spraying during redrilling, and reducing construction costs; 2. The sealing strip is made of sulfoaluminate cement, bentonite, superabsorbent resin, polypropylene fiber, nano-silica, slow-release coagulant, and plasticizer. The polypropylene fiber enables the sealing strip to have sufficient anti-bending ability, and the superabsorbent resin can swell in rainwater to form a water-stop layer, ensuring that the sealing strip can quickly seal when it enters the water leakage area; 3. An infiltration monitoring module is provided in advance in the infiltration monitoring area defined between the drill bit and the outer spiral blade. During the drilling construction process, when water leakage occurs in the mountain, the infiltration detection module can accurately monitor whether infiltration occurs in the hole. If infiltration occurs, the drilling work of the spiral drill rod is stopped to avoid causing a large amount of mountain water to spray out and bringing difficulties to subsequent construction; 4. Through the construction method for preventing water penetration during drilling of mountain tunnels described in the present invention, the mountain water can be timely sealed, reducing the impact on the construction progress, and having high economic value and popularization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic flow chart of the construction method for preventing water penetration during drilling of mountain tunnels described in the present invention; Figure 2 is a schematic diagram of the operation of the drilling rig described in the present invention; Figure 3 is a schematic internal view of the feeding cavity described in the present invention; Figure 4 is an installation state diagram of the infiltration monitoring module described in the present invention; In the figure: 1. Feeding cavity, 2. Power head, 3. Outer spiral blade, 4. Screwless spiral blade, 5. Feed bin, 6. Driving motor, 7. Water immersion sensor, 8. Unidirectional discharge door, 9. Protective cover, 10. Drilling rig. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0016] In the description of the invention, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0017] In the prior art, when constructing a tunnel in a mountain body, it is necessary to drill holes on the side wall of the mountain body. Usually, the depth of the holes is about 2 - 3 m, and the inner diameter of the holes is 20 - 25 cm. When drilling operations are carried out through a spiral drill rod, the problem of mountain water gushing out occurs in the area where the mountain water is rich in the mountain body. If it is not blocked and treated in time, the holes cannot be used. In order to block the mountain water, the conventional method is to retreat the drill and then enter again for blocking. Then, this is very likely to delay time and increase the risk of mountain water gushing. To solve this problem, as Figure 1 shown, the applicant modifies the tunnel drilling construction method. This embodiment discloses a construction method for preventing water penetration in mountain tunnel drilling, including the following steps: S10. Prepare several sealing strips in advance in the factory; The sealing strip is used as a sealing material. Because water leakage needs to be blocked in time, the sealing strip needs to be prepared in advance and needs to be convenient for subsequent delivery by a shaftless spiral blade. It is made of a water leakage sealing material in the shield field. In this embodiment, the sealing strip is made of 45 parts of sulphoaluminate cement, 20 parts of bentonite, 10 parts of superabsorbent resin, 5 parts of polypropylene fiber, 5 parts of nano-silica, 3 parts of slow-release coagulant, 2 parts of plasticizer, and 12 parts of deionized water. The polypropylene fiber enables the sealing strip to have sufficient anti-bending ability. The bentonite is a plastic carrier to prevent the material from hardening prematurely. The superabsorbent resin can expand when encountering rainwater to form a water-stop layer, ensuring that the sealing strip can quickly block when entering the water leakage area. The plasticizer can improve the extrusion molding performance for the later production of strips by an extruder; In this embodiment, the specific preparation process of the sealing strip is as follows: S1001. Add sulphoaluminate cement and bentonite to a mixer and mix at a speed of 30 rpm for 15 minutes to form a uniform base material; S1002. Sequentially add superabsorbent resin, polypropylene fiber, and nano-silica and mix at a speed of 60 rpm for 5 minutes to form a mixture; S1003. Prepare an aqueous solution of the slow-release coagulant and plasticizer, and synchronously inject the aqueous solution into the mixture in S1002 through a spray system; S1004. After stirring and mixing, form a plastic paste, and extrude the plastic paste into an initial strip-shaped material through a screw extruder; S1005. Feed the initial strip-shaped material into the curing area, set the environment to a temperature of 60°C ± 2°C and a humidity of 95% RH, conduct steam curing, and then naturally dry it until the moisture content ≤ 5%. Finally, form a sealing strip with the length of the sealing strip controlled to be 20 - 40 cm for convenient handling by construction workers; The sealing strip produced by the above preparation method has good bending resistance and excellent toughness, and can be transported by a shaftless spiral blade. Then, the sealing strip is detected by the volume displacement method, and its immersion swelling rate is about 35% in 1 h, meeting the requirements for sealing use; S20. As Figure 2 shown, a feeding cavity 1 is arranged along the axial direction inside the auger stem. The auger stem enters the site, and the auger stem is connected to the power head 2 of the drill rig 10; In this step, in order to enable the sealing strip to be quickly transported in the feeding cavity 1, a shaftless spiral blade 4 applicable to the transportation of strip-shaped materials in the prior art can be used for transportation. The specific installation process of the shaftless spiral blade 4 is as follows: As Figures 3 - 4 shown, first, install a feeding bin 5 at a position near the rear end of the side wall of the auger stem. The feeding bin 5 communicates with the feeding cavity 1, and a discharge port is arranged at a position near the front end of the feeding cavity 1; a rotating shaft with a diameter of 10 cm is welded to the front end of the shaftless spiral blade 4, and a driving shaft is welded to the rear end of the shaftless spiral blade 4; Then, the rotating shaft at the front end of the shaftless spiral blade 4 is rotationally connected to the front end of the feeding cavity 1 through a bearing assembly. The driving shaft at the rear end of the shaftless spiral blade 4 penetrates through the rear end of the feeding cavity 1 and extends to the outside of the auger stem, and the driving shaft is rotationally connected to the rear end of the feeding cavity 1 through a bearing assembly; Finally, install a driving motor 6 outside the auger stem, and the driving motor 6 is fixed to the driving shaft through a coupling; In order to facilitate the monitoring of mountain water, on the auger stem, the area between the drill bit and the outer spiral blade 3 is defined as the seepage monitoring area, and a one-way discharge door 8 is arranged in the seepage monitoring area. The one-way discharge door 8 communicates with the discharge port of the feeding cavity 1. The one-way discharge door 8 can be a conventional electric gate or a common gate that can be turned outwards, so it belongs to conventional technology and will not be described in detail here. Install a conventional seepage monitoring module in the seepage monitoring area; The installation of the seepage monitoring module includes the following steps: S201. Process a sensor groove in the seepage monitoring area; S202. Install a water immersion sensor 7 in the sensor groove; S203. Assemble a protective cover 9 with grid holes on the sensor groove. The protective cover 9 can protect the water immersion sensor 7, and at the same time, the water immersion sensor 7 detects whether there is water leakage through the grid holes at all times; S30. Measure and set out the drilling position, and drive in the marks; S40. Start the rotary drilling rig, align the auger rod with the drilling position for drilling construction, control the rotation speed to 10 - 15 revolutions per minute, and the drilling speed to 0.5 - 0.8 meters per minute; While the auger rod forms a hole when drilling into the mountain, the outer spiral blade 3 on the outside of the auger rod discharges the mountain debris; S50. During the drilling construction, when water leakage occurs in a certain place in the mountain and the water leakage phenomenon is detected by the water immersion sensor, stop the drilling work of the auger rod, control the rotation of the shaftless spiral blade 4 through the drive motor, and transport a number of sealing strips to the feeding chamber 1 through the feeding bin 5; S60. With the rotation and transportation of the shaftless spiral blade 4, the sealing strips are transported to the front end of the feeding chamber 1 close to the drill bit, and then discharged into the hole through the one-way discharge door. After the sealing strips contact water, they expand and then seal the water leakage point in the mountain; S70. When the water blocking is completed, wait statically for 0.5 - 1 h. After there is no more water leakage, carry out the subsequent construction.

[0018] Through the above-mentioned construction method for preventing water penetration in mountain tunnels during drilling, when water leakage occurs in the mountain during drilling construction, stop the work of the auger rod, fill a number of sealing strips into the feeding chamber 1, transport the sealing strips through the feeding chamber 1 to a position close to the drill bit, and then discharge the sealing strips into the hole to seal the water leakage point in the mountain. This method replaces the previous sealing method that requires redrilling and then lowering the pipe again, can quickly carry out sealing, has high construction efficiency, avoids the problem of water spraying during redrilling, and reduces the construction cost.

Claims

1. A mountain tunnel drilling and waterproofing construction method, characterized in that: The following steps are involved: S10, preparing several sealing strips in advance in the factory; S20, a feeding chamber (1) is provided in the spiral drill rod along the axial direction, a drilling rig (10) enters the site, and the spiral drill rod is connected to the power head (2) of the drilling rig (10); S30, measuring and laying out the mountain to determine the drilling position and marking it; S40, start the drilling machine, align the drill bit of the spiral drill rod with the drilling position to start drilling. When the spiral drill rod drills into the mountain to form a hole, the outer spiral blade (3) on the outer side of the spiral drill rod discharges the mountain debris; S50, during the drilling process, when water seepage occurs in the mountain, the drilling of the spiral drill rod is stopped, and a plurality of sealing strips are filled into the feeding cavity (1); S60, conveying the sealing strip through the feeding cavity (1) to a position close to the drill bit, and then discharging the sealing strip into the hole to seal the mountain water leakage point.

2. The mountain tunnel drilling waterproofing construction method according to claim 1 is characterized in that: The plugging strip is made of sulphoaluminate cement, bentonite, highly absorbent resin, polypropylene fiber, nano silicon dioxide, slow-release coagulant and plasticizer.

3. The mountain tunnel drilling waterproofing construction method according to claim 2 is characterized in that: The preparation of the blocking strip includes the following steps: S1001, adding sulphoaluminate cement and bentonite into a mixer and mixing to form a uniform base material; S1002, adding super absorbent resin, polypropylene fiber and nano silicon dioxide in sequence and mixing to form a mixture; S1003, preparing a slow-release coagulant and a plasticizer into an aqueous solution, and simultaneously injecting the aqueous solution into the mixed material of S1002 through a spray system; S1004, forming a plastic paste after stirring and mixing, and extruding the plastic paste into an initial strip material through a screw extruder; S1005, steam curing the initial strip material, and then naturally drying it to a moisture content of ≤5%, to finally form a plugging strip.

4. The mountain tunnel drilling and waterproofing construction method according to claim 3 is characterized in that: The blocking strip is in the shape of a long strip, and the length of the blocking strip is 20-40 cm.

5. The mountain tunnel drilling waterproofing construction method according to claim 1, characterized in that: In step S20, the area between the drill bit and the outer spiral blade (3) is defined as a water seepage monitoring area, and a water seepage monitoring module is provided in advance in the water seepage monitoring area; In step S50, during the drilling construction process, when water seepage occurs in the mountain, the water seepage detection module detects the water seepage in the hole and then stops the drilling work of the auger.

6. The mountain tunnel drilling waterproofing construction method according to claim 5, characterized in that: The installation of the water seepage monitoring module includes the following steps: S201, a sensor groove is processed in the water seepage monitoring area; S202, installing a water immersion sensor (7) in the sensor groove; S203, assembling a protective cover (9) with grid holes on the sensor groove.

7. The mountain tunnel drilling waterproofing construction method according to claim 5, characterized in that: In step S20, a one-way discharge door (8) is provided in advance in the water seepage monitoring area, wherein the one-way discharge door (8) is connected to the feeding cavity; In step S60, after the sealing strip enters the feeding chamber, the sealing strip is conveyed to a position close to the drill bit by using a shaftless spiral blade, and then the sealing strip is discharged into the drill hole through a one-way discharge door (8) to seal the mountain water leakage point.

8. The mountain tunnel drilling and waterproofing construction method according to any one of claims 1 to 7, characterized in that: In step S40, the rotation speed of the auger rod is controlled to 10-15 rpm.

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