Anchor rod orifice leakage dredging and stopping method and system

Abstract

The invention provides an anchor rod orifice leakage dredging and stopping method and system, and relates to the technical field of waterproof curtain anchor rod construction.The anchor rod orifice leakage dredging and stopping method comprises the following steps that a drainage pipe and a grouting pipe are arranged on the periphery of an anchor rod, the inner end of the drainage pipe and the inner end of the grouting pipe are both located in a soil body on the inner side of a waterproof curtain, and the inner end of the drainage pipe is deeper than the inner end of the grouting pipe; in the radial direction of the anchor rod, the distance between the grouting pipe and the anchor rod is smaller than the distance between the drainage pipe and the anchor rod; and then negative pressure pumping and drainage are conducted on the soil body through the drainage pipe, and grouting and leakage stopping are conducted on the soil body through the grouting pipe. Water in the to-be-reinforced soil body can be pumped out through the drainage pipe, then the soil body is reinforced through guniting, the leakage stopping purpose can be achieved, the drainage effect in the active drainage process is better, the water content in the to-be-reinforced soil body can be reduced, the situation that in the guniting process, the water cooperates with slurry to flow out of an anchor rod orifice, and leakage is avoided is avoided. And the soil body is difficult to reinforce.

Description

Technical Field

[0001] The invention relates to the technical field of water-stop curtain anchor rod construction, and in particular to a method and system for stopping leakage at an anchor rod hole. Background Art

[0002] At present, deep foundation pit support mostly adopts a water-stop curtain plus anchor rod (or anchor cable) support system. During the construction of anchor rods, it is necessary to penetrate the water-stop curtain, destroy the integrity of the water-stop curtain, and form a drainage hole. Under the action of groundwater pressure outside the foundation pit, the anchor rod will leak through the hole of the water-stop curtain, affecting the safety of the foundation pit slope; seepage water enters the foundation pit and soaks the foundation, affecting the subsequent earthwork excavation and foundation bearing capacity.

[0003] At present, the problem of anchor hole leakage is mostly solved by drainage through a diversion pipe at the hole or by constructing a pressure relief well to reduce pressure and then grouting to stop water. However, the construction of a vertical pressure relief well after foundation pit excavation has problems such as limited construction site and large disturbance to the soil behind the pit, which further increases the safety risk of the foundation pit and makes it difficult to ensure the drainage capacity. The method of hole drainage is usually to set a diversion pipe at the hole to make the water passively seep. The inner end of this type of diversion pipe is set shallowly, and the drainage effect is poor.

[0004] Therefore, in order to solve the problem of anchor hole leakage in the water-stop curtain support system and ensure the safety of the foundation pit, a new solution needs to be provided. Summary of the invention

[0005] The object of the present invention is to provide a method and system for stopping leakage at an anchor hole to solve the problems existing in the above-mentioned prior art. The water in the soil to be reinforced can be extracted by a drainage pipe, and then the soil can be reinforced by spraying to achieve the purpose of stopping leakage. In addition, the active drainage process in the present invention has a better drainage effect, which can reduce the water content in the soil to be reinforced, and avoid the problem that water and slurry flow out of the anchor hole during the spraying process, making it difficult to reinforce the soil.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A method for preventing leakage at an anchor hole, comprising the following steps:

[0008] 1) A drain pipe and a grouting pipe are arranged on the periphery of the anchor rod, the inner ends of the drain pipe and the grouting pipe are both located in the soil inside the water-stop curtain, the distance between the grouting pipe and the anchor rod is smaller than the distance between the drain pipe and the anchor rod, and the inner end depth of the drain pipe is greater than the inner end depth of the grouting pipe; 2) The drain pipe is used to pump negative pressure water out of the soil; 3) The grouting pipe is used to grout the soil to stop leakage.

[0009] In one embodiment, in step 1), the drainage pipe comprises a metal pipe body with leakage holes on the pipe wall, the metal pipe body is drilled into the soil as a well drilling pipe, and then a water filtering material is arranged in the metal pipe body.

[0010] In one embodiment, in step 1), the drainage pipe comprises a plastic pipe body with leakage holes on the pipe wall, and the outside of the plastic pipe body has a water filtering material.

[0011] In one embodiment, the inner end of the grouting pipe is located 0.4m to 1m inside the water-stop curtain; the inner end of the drainage pipe is located 1m to 2m inside the water-stop curtain; along the radial direction of the anchor rod, the grouting pipe is 0.2m to 0.4m away from the anchor rod, and the drainage pipe is 0.5m to 1m away from the anchor rod.

[0012] In one embodiment, in step 1), a plurality of the drainage pipes and a plurality of the grouting pipes are arranged around the anchor rod, and the outer ends of the plurality of the drainage pipes are connected to the main drainage pipe.

[0013] In one embodiment, in step 3), the grouting pipe is connected to a shotcrete machine for rotary shotcrete spraying.

[0014] In one embodiment, step 2) and step 3) are performed simultaneously.

[0015] The present invention also provides an anchor hole leakage drainage system, comprising a drain pipe and a grouting pipe, wherein the drain pipe is located at the periphery of the anchor, the inner end of the drain pipe is located in the soil inside the water-stop curtain, and the outer end of the drain pipe is used to connect a negative pressure extraction device; the grouting pipe is located at the periphery of the anchor, the distance between the grouting pipe and the anchor is smaller than the distance between the drain pipe and the anchor, the inner end of the grouting pipe is located in the soil inside the water-stop curtain, the inner end depth of the grouting pipe is smaller than the inner end depth of the drain pipe, and the outer end of the grouting pipe is used to connect a shotcrete machine.

[0016] In one embodiment, the drain pipe includes a metal pipe body and a water filtering material disposed inside the metal pipe body.

[0017] In one embodiment, a plurality of the drainage pipes and a plurality of the grouting pipes are arranged around the anchor rod, the outer ends of the plurality of the drainage pipes are connected to a drainage main pipe, and the end of the drainage main pipe is connected to a vacuum pump.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] The present invention, by setting a draining pipe and a grouting pipe located at the periphery of the anchor rod, can utilize the draining pipe to cooperate with the negative pressure extraction device to extract the water in the soil body to be reinforced, so that the draining effect is better, and the effect of stopping leakage can be achieved after the soil body is reinforced by spraying. The draining process can reduce the water content in the soil body to be reinforced, and avoid the problem that the water body cooperates with the slurry to flow out from the anchor rod orifice during the spraying process, making it difficult to reinforce the soil body. In addition, the draining pipe in the present invention is not arranged at the orifice position, and will not be subject to the limitations of the orifice. The inner end of the draining pipe can be arranged deeper, which is more convenient for actively extracting the water body. Furthermore, the draining pipe and the grouting pipe in the present invention are simple in structure, convenient in construction, and the material selection is universal, the production cost is lower, and it is more convenient to promote.

[0020] Other technical solutions of the present invention also have the following technical effects:

[0021] The metal pipe body in the drainage pipe of the present invention is used as a well drilling pipe to be drilled into the soil. There is no need to use a conventional drill pipe to drill a hole, then pull out the drill pipe, and then install the drainage pipe. This can reduce the operating procedures and improve construction efficiency, and also reduce the disturbance to the soil, avoiding deformation of the soil under the action of the dynamic water head, which makes it difficult to reinsert the drainage pipe into the drill hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the structure of the grouting pipe and the drainage pipe in the anchor hole leakage prevention system in one embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an anchor hole leakage prevention system in one embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of a drain pipe in one embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the structure of a grouting pipe in one embodiment of the present invention;

[0027] Description of reference numerals:

[0028] 1. Anchor rod; 2. Guard pile; 3. Water-stop curtain; 4. Anchor; 5. Anchoring area; 6. Drain pipe; 7. Grouting pipe; 8. Drainage main pipe; 9. Vacuum pump; 10. Grouting hole; 11. Drainage branch pipe; 12. Metal pipe body; 13. Water filtration material. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The object of the present invention is to provide a method and system for stopping leakage at an anchor hole to solve the problems existing in the prior art. The method can utilize a drainage pipe to extract water from the soil to be reinforced, and then reinforce the soil by spraying to achieve the purpose of stopping leakage. Moreover, the active drainage process in the present invention has a better drainage effect, which can reduce the water content in the soil to be reinforced, and avoid the problem that water and slurry flow out of the anchor hole during the spraying process, making it difficult to reinforce the soil.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Embodiment 1:

[0033] In the prior art, after the anchor rod 1 passes through the guard pile 2 and the water-stop curtain 3, the inner end is grouted and anchored in the soil to form an anchoring area 5, and the outer end is fixed to the guard pile by an anchor 4, thereby reinforcing the water-stop curtain 3.

[0034] like Figure 1 to Figure 4 As shown, this embodiment provides a method for preventing leakage at an anchor hole, comprising the following steps: first, a drain pipe 6 and a grouting pipe 7 are arranged on the periphery of the anchor 1, and the drain pipe 6 and the grouting pipe 7 are arranged as parallel to the anchor 1 as possible. The inner end of the drain pipe 6 and the inner end of the grouting pipe 7 are both located in the soil body inside the water-stop curtain 3, wherein the inner end of the drain pipe 6 is located at or close to the water body in the soil layer. The inner end depth of the drain pipe 6 is greater than the inner end depth of the grouting pipe 7. In the radial direction of the anchor 1, the distance between the grouting pipe 7 and the anchor 1 is smaller than the distance between the drain pipe 6 and the anchor 1. Then the outer end of the drainage pipe 6 is connected to the negative pressure extraction equipment, and the negative pressure extraction equipment drains the soil within the range of the shotcrete through the drainage pipe 6; finally, the drained soil is grouted using the grouting pipe 7, the slurry and the soil are fully bonded and solidified, and the water leakage formed by the anchor rod 1 is blocked to achieve the purpose of stopping leakage; at the same time, the water leakage that may be formed between the grouting pipe 7 and the drainage pipe 6 and the water-stop curtain 3 will also be blocked, and no water will seep in.

[0035] Therefore, the present embodiment, by setting the drain pipe 6 and the grouting pipe 7 located at the periphery of the anchor rod 1, can utilize the drain pipe 6 to cooperate with the negative pressure extraction device to extract the water in the soil body to be reinforced, the draining effect is better, and the effect of stopping leakage can be achieved after the soil body is reinforced by grouting. The draining process can reduce the water content in the soil body to be reinforced, and avoid the problem that the water body cooperates with the slurry to flow out from the orifice of the anchor rod 1 during the grouting process, making it difficult to reinforce the soil body. In addition, the drain pipe 6 in the present embodiment is not set at the orifice position, will not be subject to the limitations of the orifice, can set the inner end of the drain pipe 6 deeper, and is more convenient to actively extract the water body. Furthermore, the drain pipe 6 and the grouting pipe 7 in the present embodiment are simple in structure, convenient in construction, and the material selection is universal, the production cost is lower, and it is more convenient to promote.

[0036] The slurry in this embodiment is a conventional cement-water glass double liquid slurry, and the solidification time at the rear end of the spraying is usually between 26s and 127s.

[0037] In one embodiment, in step 1), the hole-forming process of the drainage pipe 6 can adopt a self-sustaining water drilling hole-forming device, a dry hole-forming device, and a high-pressure water impact hole-forming device; in the self-sustaining water drilling hole-forming device, the hole-forming drill rod adopts a 1-inch steel pipe (usually refers to a steel pipe with an outer diameter of 33.4 mm and an inner diameter of 25.4 mm), which is assembled in sections of 0.5 m, and a handheld electric drill rig is used as the power. The dry hole-forming device adopts a spiral drill rig; in the high-pressure water impact hole-forming device, the hole-forming drill rod adopts a 1-inch steel pipe, which is assembled in sections of 0.5 m, and a flow rate of 3m 3 / h high pressure water pump.

[0038] The drainage pipe 6 can be selected in the form of a combination of a plastic pipe body and a water filter material 13 according to different strata, and the water filter material 13 is located outside the plastic pipe body. The diameter of the plastic pipe body is 1 inch (usually refers to an outer diameter of 33.4 mm and an inner diameter of 25.4 mm), and the length is 0.5 m. Multiple plastic pipe bodies can be connected by threads, and the water filter material 13 uses a water filter bag.

[0039] The drainage pipe 6 can also be in the form of a combination of a metal pipe body 12 and a water filter material 13. In this case, the metal pipe body 12 is placed in the soil as a well drilling pipe. That is, the metal pipe body 12 is a 1-inch steel pipe with a length of 0.5m, and adjacent metal pipe bodies 12 are threadedly connected. The metal pipe body 12 is connected to the drill bit and is directly drilled into the soil under the drive of the drill bit. There is no need to use a conventional drill rod to drill a hole, then pull out the drill rod, and then install the drainage pipe 6. This method can not only reduce the operating procedures and improve construction efficiency, but also reduce the disturbance to the soil, avoid deformation of the soil under the action of the dynamic water head, and make it difficult to reinsert the drainage pipe 6 into the borehole. In order to filter the extracted water, after the metal pipe body 12 is placed in the soil, a water filter material 13 is set in the metal pipe body 12 for filtering water. Figure 3As shown, it is avoided that the sand is pumped out together with the water body, which causes the soil body to deform. The water filtering material 13 can be an engineering water filtering sponge.

[0040] In one embodiment, the inner end of the grouting pipe 7 is located 0.4m to 1m inside the water-stop curtain 3; the inner end of the drain pipe 6 is located 1m to 2m inside the water-stop curtain 3; along the radial direction of the anchor rod 1, the distance between the grouting pipe 7 and the anchor rod 10 is 0.5m to 0.6m, and the distance between the drain pipe 6 and the anchor rod 10 is 0.7m to 1m. The distances between the grouting pipe 7 or the drain pipe 6 and the anchor rod 1 mentioned above are the distances between their respective center lines. The positions of the grouting pipe 7 and the drain pipe 6 relative to the anchor rod 1 can be determined according to the leakage position of the orifice at the anchor rod 1.

[0041] In one embodiment, in step 1), a plurality of drain pipes 6 and a plurality of grouting pipes 7 are arranged around the anchor rod 1, and the drain pipes 6 and the grouting pipes 7 are evenly arranged along the circumference of the anchor rod 1 to ensure the uniformity of drainage and grouting. And the outer ends of the plurality of drain pipes 6 are connected to the drainage main pipe 8. The outer end of the drain pipe 6 can be directly connected to the drainage main pipe 8, or the outer end of the drain pipe 6 can be first connected by the drainage branch pipe 11, and then connected to the drainage main pipe 8 by the drainage branch pipe 11. The drainage main pipe 8 is connected to a negative pressure extraction device. The negative pressure extraction device can select a vacuum pump 9, such as Figure 2 shown.

[0042] In one embodiment, in step 3), the grouting pipe 7 is connected to a grouting machine for rotary grouting. A plurality of grouting holes 10 are provided on the wall of the grouting pipe 7 along the axial direction, such as Figure 4 During the grouting process, the high-pressure slurry can cut the soil, increase the contact area between the slurry and the soil, and improve the bonding effect with the soil.

[0043] In one embodiment, the soil body can be first drained and then reinforced by spraying; in some cases, the drainage process can also be carried out simultaneously with the spraying reinforcement process to ensure that the slurry does not flow out of the orifice under the synergistic effect of the water body. Of course, when operating, those skilled in the art can also start the spraying machine first to achieve the spraying action, and then start the negative pressure pumping equipment to pump water, but this operation may not achieve the effect of reinforcing the soil body to stop leakage in the early stage of construction, but in the middle and late stages, as the water body is discharged, it can achieve the effect of stopping leakage. The purpose of illustrating this is to show that the spraying action and the pumping action in this embodiment do not actually have an obvious order of precedence, and no matter what the order of operation is, the effect of stopping leakage can be achieved in the end.

[0044] Embodiment 2:

[0045] like Figure 1 to Figure 4As shown, this embodiment provides an anchor hole leakage prevention system, including a drain pipe 6 and a grouting pipe 7, both of which are outside the anchor 1. The inner end of the drain pipe 6 and the inner end of the grouting pipe 7 are both located in the soil inside the water-stop curtain 3, and the inner end depth of the grouting pipe 7 is less than the inner end depth of the drain pipe 6. The outer end of the drain pipe 6 and the outer end of the grouting pipe 7 are both located outside the guard pile 2. The outer end of the drain pipe 6 is used to connect the negative pressure extraction equipment, and the outer end of the grouting pipe 7 is used to connect the shotcrete machine.

[0046] In one embodiment, the drainage pipe 6 includes a metal pipe body 12 and a water filtering material 13 disposed inside the metal pipe body 12 , and a leakage hole is disposed on the pipe wall of the metal pipe body 12 .

[0047] In one embodiment, a plurality of drain pipes 6 and a plurality of grouting pipes 7 are arranged around the anchor rod 1, and the plurality of drain pipes 6 and the plurality of grouting pipes 7 are uniformly arranged along the circumference of the anchor rod 1. The grouting pipes 7 and the drain pipes 6 can be correspondingly located on the radial extension line of the anchor rod 1, or can be arranged at intervals in the circumferential direction. The outer ends of the plurality of drain pipes 6 are all connected to the drainage main pipe 8, and the end of the drainage main pipe 8 is connected to the vacuum pump 9.

[0048] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for preventing leakage at an anchor hole, characterized in that: The following steps are involved: 1) A drainage pipe and a grouting pipe are arranged on the periphery of the anchor rod, the inner ends of the drainage pipe and the grouting pipe are both located in the soil body inside the water-stop curtain, the inner end depth of the drainage pipe is greater than the inner end depth of the grouting pipe, and in the radial direction of the anchor rod, the distance between the grouting pipe and the anchor rod is less than the distance between the drainage pipe and the anchor rod; 2) Using the drainage pipe to drain the soil under negative pressure; 3) The grouting pipe is used to inject grout into the soil to stop leakage.

2. The anchor hole leakage prevention method according to claim 1, characterized in that: In step 1), the drainage pipe includes a metal pipe body with leakage holes on the pipe wall. The metal pipe body is drilled into the soil as a well drilling pipe, and then a water filtering material is arranged in the metal pipe body.

3. The anchor hole leakage prevention method according to claim 1, characterized in that: In step 1), the drainage pipe comprises a plastic pipe body with leakage holes on the pipe wall, and the outside of the plastic pipe body has a water filtering material.

4. The anchor hole leakage prevention method according to claim 1, characterized in that: The inner end of the grouting pipe is located 0.4m to 1m inside the water-stop curtain; the inner end of the drainage pipe is located 1m to 2m inside the water-stop curtain; along the radial direction of the anchor rod, the grouting pipe and the drainage pipe are both 0.5m to 1m away from the anchor rod.

5. The anchor hole leakage prevention method according to claim 1, characterized in that: In step 1), a plurality of drainage pipes and a plurality of grouting pipes are arranged around the anchor rod, and the outer ends of the plurality of drainage pipes are connected to the main drainage pipe.

6. The anchor hole leakage prevention method according to claim 1, characterized in that: In step 3), the grouting pipe is connected to a spraying machine for rotary spraying.

7. The anchor hole leakage prevention method according to claim 1, characterized in that: Step 2) and step 3) are performed simultaneously.

8. An anchor hole leakage prevention system, characterized in that: include: A drainage pipe, wherein the drainage pipe is located outside the anchor rod, the inner end of the drainage pipe is located in the soil inside the water-stop curtain, and the outer end of the drainage pipe is used to connect the negative pressure extraction device; A grouting pipe, wherein the grouting pipe is located at the periphery of the anchor rod, the distance between the grouting pipe and the anchor rod is smaller than the distance between the drainage pipe and the anchor rod, the inner end of the grouting pipe is located in the soil inside the water-stop curtain, the inner end depth of the grouting pipe is smaller than the inner end depth of the drainage pipe, and the outer end of the grouting pipe is used to connect a shotcrete machine.

9. The anchor hole leakage prevention system according to claim 8, characterized in that: The drainage pipe comprises a metal pipe body and a water filtering material arranged inside the metal pipe body.

10. The anchor hole leakage prevention system according to claim 8, characterized in that: A plurality of drainage pipes and a plurality of grouting pipes are arranged around the anchor rod, the outer ends of the plurality of drainage pipes are connected to a drainage main pipe, and the end of the drainage main pipe is connected to a vacuum pump.

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