Plugging method of a grout stop tape placement device for borehole plugging

Abstract

The present invention discloses a slurry-stop belt placing device and a plugging method for borehole plugging. The plugging method includes determining the depth of the borehole and determining the length of the slurry-stop belt according to the borehole depth; fixing one end of the slurry-stop belt to the guiding head, and moving the guiding head fixed with the slurry-stop belt to the bottom of the borehole through the main body; rotating the main body to disengage from the guiding head, and then withdrawing the main body from the borehole; injecting liquid into the slurry-stop belt from the other end of the slurry-stop belt until the internal pressure of the slurry-stop belt reaches a certain pressure, then stopping injecting the liquid, and detecting whether the slurry-stop belt leaks; injecting slurry into the accessory borehole, relieving the pressure of the slurry-stop belt after the slurry injection is completed, and removing the slurry-stop belt and the guiding head. This plugging method effectively alleviates the problem of slurry leakage from the drilled holes near the slurry injection holes in the goaf grouting project during the grouting process.

Description

Technical Field

[0001] The present invention relates to the field of grouting in goafs, and particularly to a plugging method for a grout-stop belt placement device for borehole plugging. Background Art

[0002] In recent years, the scale of infrastructure construction in China has been continuously expanding, and more and more goafs have been developed into construction land, resulting in an increasing demand for goaf treatment. As a relatively mature method for goaf foundation treatment, the perfusion filling method is the most widely used treatment method in goaf treatment. It is applicable to the foundation treatment of various coal mine goafs and can reinforce the caving zone cavities, fracture zone fissures, and bending zone separation fissures developed in the goaf foundation. Under reliable construction organization, this method usually has good treatment effects.

[0003] During the grouting treatment process, to ensure the filling rate of the grout in the goaf fissures and cavities, it is generally prohibited to grout after connecting holes in series to prevent grout leakage from adjacent boreholes. However, in actual production, there are often continuous grouting holes due to coordination problems between the drilling and grouting teams, or there are hydrogeological holes, exploration holes, etc. beside the designed grouting hole positions. The existing plugging schemes have high costs, uncontrollable effects, cannot well solve the plugging problem, and do not have a protective effect on the boreholes.

[0004] Based on this, the present invention proposes a novel device and method for borehole grouting plugging and protection, which can enhance the plugging effect of boreholes and improve the reuse ability of boreholes at low costs.

[0005] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a grout-stop belt placement device for borehole plugging and a plugging method, which can effectively alleviate the problem of poor plugging effect during borehole grouting.

[0007] To achieve the above purpose, an embodiment of the present invention provides a grout-stop belt placement device for borehole plugging, which is used to place a guiding head with a grout-stop belt into a borehole. The grout-stop belt placement device for borehole plugging includes a main body and a guiding head. The guiding head is provided on the main body. The guiding head has a threaded column screwed to the main body. The guiding head is provided with a clamping strip that can abut against the borehole, and the guiding head is provided with a groove for fixing the grout-stop belt.

[0008] In one or more embodiments of the present invention, a jack is provided inside the guiding head. The clamping strip is provided in the jack, and at least part of the clamping strip is located outside the guiding head.

[0009] The present invention also provides a plugging method for the grout-stop belt placement device for borehole plugging as described above, including the following steps:

[0010] Determine the depth of the borehole, and determine the length of the grout-stop belt based on the borehole depth; fix one end of the grout-stop belt to the guiding head, and move the guiding head fixed with the grout-stop belt to the bottom of the borehole through the main body; rotate the main body to disengage from the guiding head, and then withdraw the main body from the borehole; inject liquid into the grout-stop belt from the other end until the internal pressure of the grout-stop belt reaches a certain pressure, then stop injecting the liquid, and detect whether the grout-stop belt leaks; grout into the accessory borehole, after the grouting is completed, relieve the pressure of the grout-stop belt, and remove the grout-stop belt and the guiding head.

[0011] In one or more embodiments of the present invention, inject liquid into the grout-stop belt until the internal pressure of the grout-stop belt reaches 1 Mpa, and then stop injecting the liquid.

[0012] In one or more embodiments of the present invention, the detection of whether the grout-stop belt leaks includes stopping injecting the liquid after the internal pressure of the grout-stop belt reaches 1 Mpa, and observing for not less than 30 minutes. If the pressure remains unchanged, it is considered that there is no leakage.

[0013] In one or more embodiments of the present invention, the pressure relief includes relieving the internal pressure of the grout-stop belt one hour after the grouting of the nearby borehole is completed.

[0014] In one or more embodiments of the present invention, a plug is provided at one end of the grout-stop belt near the bottom of the borehole, and the plug is made of a soft material.

[0015] In one or more embodiments of the present invention, a reducer is connected to the end of the grout-stop belt away from the bottom of the borehole, a pipeline is provided on the reducer, and a pressure gauge, a pressure relief valve and a valve are respectively provided on the pipeline.

[0016] In one or more embodiments of the present invention, a plurality of protruding rings are provided on the outer wall of the grout-stop belt.

[0017] In one or more embodiments of the present invention, the liquid includes water.

[0018] Compared with the prior art, the grout-stop belt placement device for borehole plugging and the plugging method according to the embodiments of the present invention have the following advantages:

[0019] Effectively alleviates the problem of slurry leakage during drilling near the grouting holes in the gob area grouting project, provides complete protection for the entire drill hole, does not affect the use of the drill hole after grouting, and can detect the diameter reduction of the drill hole and the diffusion of the slurry during the protection process through a pressure gauge. In addition, the main body of the grout stop and the guiding head can be reused, the liquid is water, the cost is low, the economic benefit is high, and the operation is convenient and fast. Brief Description of the Drawings

[0020] Figure 1 is a schematic flow chart of the plugging method according to an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram during the plugging of a drill hole according to an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of the grout stop device for plugging a drill hole according to an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of the guiding head according to an embodiment of the present invention.

[0024] Main Reference Numerals Description:

[0025] 1, main body; 2, guiding head; 21, threaded column; 22, jack; 23, clamping strip; 24, groove; 25, binding wire; 3, grout stop; 4, reducing head; 5, pressure gauge; 6, pressure relief valve; 7, valve; 8, pipeline. Detailed Embodiments

[0026] The following combines the drawings to describe the detailed embodiments of the present invention in detail, but it should be understood that the protection scope of the present invention is not limited by the detailed embodiments.

[0027] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0028] Such as Figures 1 to 4As shown in the figure, a grout-stop belt 3 placement device for drilling plugging according to a preferred embodiment of the present invention is used to place a guiding head 2 with a grout-stop belt 3 into a drill hole. The grout-stop belt 3 placement device for drilling plugging includes a main body 1 and a guiding head 2. The main body 1 is in a long columnar structure, and the guiding head 2 is in a conical structure. The guiding layer is composed of two layers. The outer layer is woven from polyester filaments, with good wear resistance and anti-aging performance, which is beneficial to protecting the grout-stop belt 3 from being scratched by the protruding rocks around the drill hole during use, and prolonging the service life and the recyclable service life. The inner layer is made of polyurethane, with good high-pressure explosion-proof and corrosion-resistant performance. For deeper drill holes or situations with higher grouting pressures, to ensure a good grout plugging effect, the pressure inside the grout-stop belt 3 is relatively large, and high-pressure-resistant materials must be used; in actual engineering, the source of the filling water inside the grout-stop belt 3 is not fixed, so the corrosion-resistant performance is particularly important. The grout-stop belt 3 is a soft material, and its circumference is slightly larger than the circumference of the drill hole wall, preferably 10 mm to 20 mm, which is convenient for the close fit between the hole wall and the grout-stop belt 3. The guiding head 2 is provided on the main body 1. The main body 1 is provided with a threaded hole, and the guiding head 2 has a threaded post 21 that is screwed into the threaded hole. The diameter of the threaded post 21 is slightly smaller than the diameter of the threaded hole, as long as it can be ensured that it does not fall off during the lowering process. Such a setting facilitates the reverse relative rotation of the main body 1 and the guiding head 2 to realize the separation of the two. The guiding head 2 is provided with a jack 22. There are two jacks 22, and the two jacks 22 are in a V-shaped structure. A clamping strip 23 is provided corresponding to the jack 22, and at least part of the clamping strip 23 is located outside the guiding head 2. When the main body 1 is separated from the guiding head 2, the clamping strip 23 has a certain abutting effect on the inner wall of the drill hole, and the clamping strip 23 can provide a supporting force for the guiding head 2 to separate from the main body 1. The guiding head 2 is provided with a groove 24 for fixing the grout-stop belt 3. Specifically, one end of the grout-stop belt 3 is wrapped around the guiding head 2 and is cooperated with the groove 24 through a binding wire 25 to realize the fixation of the grout-stop belt 3 on the guiding head 2. The setting of the groove 24 can effectively prevent the grout-stop belt 3 from falling off the guiding head 2.

[0029] The present invention also provides a plugging method for the grout-stop belt 3 placement device for drilling plugging as above, including the following steps:

[0030] S1: Determine the depth of the drill hole, and determine the length of the grout-stop belt 3 according to the depth of the drill hole. Specifically, in one embodiment, the length of the grout-stop belt 3 is longer than the length of the drill hole, so that the excess part of the grout-stop belt 3 can be used to connect with the guiding head 2 and the reducing head 4.

[0031] S2: Fix one end of the grout-stop belt 3 on the guiding head 2 through a binding wire 25, and move the guiding head 2 with the fixed grout-stop belt 3 to the bottom of the drill hole through the main body 1. At this time, one end of the grout-stop belt 3 touches the bottom of the drill hole, and the other end is located at the upper end of the drill hole.

[0032] S3: Rotate the main body 1 to separate it from the guiding head 2, and then pull the main body 1 out of the drill hole.

[0033] S4: Fill the grout stop 3 with liquid from the other end of the grout stop 3 until it is full. The liquid includes water. Stop injecting the liquid after the internal pressure of the grout stop 3 reaches 1 Mpa. Then, detect whether the grout stop 3 leaks. Specifically, detecting whether the grout stop 3 leaks includes stopping injecting the liquid after the internal pressure of the grout stop 3 reaches 1 Mpa and observing for no less than 30 minutes. If the pressure remains unchanged, it is considered not to leak.

[0034] S5: Grout into the accessory borehole. After the grouting is completed, relieve the pressure of the grout stop 3. Relieving the pressure includes relieving the internal pressure of the grout stop 3 one hour after the grouting of the nearby borehole is completed. The remaining pressure after pressure relief is not less than 1 Mpa, which is mainly used to protect the borehole and prevent borehole collapse. However, this pressure should not be too large to prevent affecting the service life of the grout stop 3. Then, pull the grout stop 3 with the guide head 2 out of the borehole.

[0035] In one embodiment, a plug is provided at one end of the grout stop 3 near the bottom of the borehole. The plug is made of a soft material and is convenient to fall to the bottom of the borehole along with the guide head 2. The other end of the grout stop 3 is connected with a reducer head 4. The reducer head 4 is fixedly connected with the grout stop 3 as a connecting piece. A pipeline 8 is connected to the reducer head 4. A pressure gauge 5, a pressure relief valve 6 and a valve 7 are respectively provided on the pipeline 8. The measuring range of the pressure gauge 5 is preferably 1 Mpa to 10 Mpa and is used for monitoring the water pressure in the grout stop 3. In view of the incompressibility of water, the change in pressure can be used to determine whether there is borehole necking in the borehole, whether the grouting slurry reaches the borehole, whether there is a leakage point, etc. The pressure relief valve 6 is used to control the maximum pressure to prevent pipe bursting. The valve 7 is used to control the injection of water into the grout stop 3.

[0036] In one embodiment, a plurality of raised rings are provided on the outer wall of the grout stop 3. The diameter of this part is about 20 mm larger than other parts of the main body 1. When the borehole wall is incomplete, there are local voids or large cracks, the leakage area is blocked between two raised rings. Therefore, the spacing should not be too large or too small. According to engineering experience, it is preferably set to 1 m to 2 m.

[0037] Compared with the prior art, the grout stop 3 placement device and plugging method for borehole plugging according to the embodiments of the present invention have the following advantages:

[0038] It solves the problem of slurry leakage in the borehole drilled near the grouting borehole during the gob grouting project, provides complete protection for the entire borehole, does not affect the use of the borehole after grouting, and can detect the necking of the borehole and the diffusion of the slurry during the protection process through the pressure gauge 5. In addition, the main body 1 of the grout stop 3 and the guide head 2 can be reused, the liquid is water, the cost is low, the economic benefit is high, and the operation is convenient and fast.

[0039] The foregoing description of specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the invention, as well as various different selections and modifications. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A plugging method using a grout-stop belt placing device for borehole plugging, characterized in that: The grout-stop belt placing device for borehole plugging is used to place a guiding head with a grout-stop belt into the borehole, and includes: A main body; A guiding head provided on the main body. The guiding head has a threaded post screwed to the main body. The guiding head is provided with a clamping strip capable of abutting against the borehole, and the guiding head is provided with a groove for fixing the grout-stop belt; An insertion hole is provided inside the guiding head, the clamping strip is arranged in the insertion hole, and at least part of the clamping strip is located outside the guiding head; The plugging method includes the following steps: Determine the depth of the borehole, and determine the length of the grout-stop belt according to the borehole depth; Fix one end of the grout-stop belt to the guiding head, and move the guiding head with the fixed grout-stop belt to the bottom of the borehole through the main body; Rotate the main body to disengage from the guiding head, and then withdraw the main body from the borehole; Fill the grout-stop belt with liquid from the other end of the grout-stop belt. Stop injecting liquid after the internal pressure of the grout-stop belt reaches a certain pressure, and detect whether the grout-stop belt leaks; Inject grout into the adjacent borehole. After the grouting is completed, relieve the pressure of the grout-stop belt, and remove the grout-stop belt and the guiding head.

2. The plugging method of the grout stop belt placement device for drilling plugging according to claim 1, characterized in that, Fill the grout-stop belt with liquid until the internal pressure of the grout-stop belt reaches 1 Mpa and then stop injecting liquid.

3. The plugging method of the grout stop belt placement device for borehole plugging according to claim 2, characterized in that, The detection of whether the grout-stop belt leaks includes: Stop injecting liquid after the internal pressure of the grout-stop belt reaches 1 Mpa, and observe for no less than 30 minutes. If the pressure remains unchanged, it is considered that there is no leakage.

4. The plugging method of the grout stopping belt placing device for borehole plugging according to claim 1, characterized in that, The pressure relief includes: Relieve the internal pressure of the grout-stop belt one hour after the grouting of the adjacent borehole is completed.

5. The plugging method of the grout stop belt placing device for drilling plugging according to claim 1, characterized in that One end of the grout-stop belt near the bottom of the borehole is provided with a plug made of a soft material.

6. The plugging method of the grout stopping belt placing device for borehole plugging according to claim 5, characterized in that, One end of the grout-stop belt away from the bottom of the borehole is connected with a reducer. A pipeline is provided on the reducer, and a pressure gauge, a pressure relief valve and a valve are respectively provided on the pipeline.

7. The plugging method of the grout stop belt placing device for borehole plugging according to claim 1, characterized in that, The outer wall of the grout-stop belt is provided with a plurality of raised rings.

8. The plugging method of the grout-stop belt placing device for borehole plugging according to claim 1, characterized in that, The liquid includes water.

Images