Hole-sealing-free lap joint type directional grouting steel pipe

Abstract

The utility model relates to the technical field of underground fracture crushed zone grouting reinforcement, and provides a hole-sealing-free lap joint type directional grouting steel pipe. Comprising a first directional grouting steel pipe and a second directional grouting steel pipe, and the second directional grouting steel pipe is detachably connected to the tail end of the first directional grouting steel pipe; a plurality of grout outlet holes are evenly formed in the middle rear portion of the first directional grouting steel pipe and the middle rear portion of the second directional grouting steel pipe respectively, the first directional grouting steel pipe and the second directional grouting steel pipe are bonded with the two ends of an annular damping device respectively, and the annular damping device covers the grout outlet holes. The device has the beneficial effects that the annular rubber damping device and the damping barbs arranged on the upper portion of the annular rubber damping device are pressed through the pressure of slurry for hole sealing, and the problems of slurry leakage and slurry leakage can be solved; when the slurry is pumped out from the slurry outlet hole of the grouting pipe, the slurry can be isolated through the annular damping device, and the high-pressure slurry can only be directionally injected into the fracture fracture zone needing to be reinforced, so that directional grouting of the fault fracture zone is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of grouting reinforcement of underground fissure and broken zones, and in particular to a sealing-free overlapping type directional grouting steel pipe. Background Art

[0002] In recent years, with the rapid development of my country's mining industry, the mining depth has been continuously extended to the deep underground, the engineering geological conditions encountered have become increasingly complex, and the problems faced have become more and more challenging. However, many engineering examples and experiences have shown that the stability of engineering rock mass is significantly affected by the fracture zone. The development degree, distribution, fracture combination characteristics and engineering properties of the fracture zone play a decisive role in the mechanical properties of the rock mass.

[0003] The use of grouting measures to reinforce the fractured zone can achieve the purpose of improving the mechanical properties of the surrounding rock and enhancing the integrity of the surrounding rock. Grouting uses a grouting pump as the power and grouting equipment such as a high-pressure hose to inject materials with cementitious properties such as silicate cement, Marisan, and polyurethane into the original fractured zone in the medium. Through the coagulation and solidification of the slurry, a stone body with a complete structure, high impermeability and mechanical stability is finally re-formed, thereby achieving the purpose of improving the geological conditions of the injected fractured zone.

[0004] After grouting reinforcement, the slurry is bonded to the fractured surfaces of the joints in the rock mass by filling, extrusion, seepage, etc., and its overall mechanical properties are greatly improved. However, the interface between the rock and the grouting material is still a weak strength area. At the same time, due to the concealment of the grouting project, it is difficult to find out the diffusion law of the slurry in the fractured rock mass. The final diffusion distance of the slurry has been determined by empirical judgment, which makes it difficult to make an accurate quantitative evaluation of the grouting reinforcement effect. The existing grouting process mainly uses two processes: grouting anchor cable and grouting steel pipe. The application of the existing grouting process has achieved certain results in coal rock reinforcement, but the existing grouting process inevitably has the following problems:

[0005] (1) The sealing technology is relatively backward: In the existing grouting technology, polyurethane, bladder bags or special sealers are mostly used for sealing. The insufficient sealing strength of polyurethane often leads to slurry leakage, and the cost of bladder bags and special sealers is relatively high;

[0006] (2) Unable to carry out directional grouting: During the long-distance, large-diameter, high-pressure advance reinforcement of the broken zone, directional grouting cannot be carried out on the faults and fissures with large impacts. Grouting is also carried out in the grouting holes on small structural broken zones that have little impact on the mining project, resulting in a waste of grouting materials.

[0007] In view of this, the present utility model is proposed. Utility Model Content

[0008] The utility model aims to provide a sealing-free overlapping type directional grouting steel pipe to solve the technical problems existing in the prior art.

[0009] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a sealing-free overlapped directional grouting steel pipe, comprising: a first directional grouting steel pipe and a second directional grouting steel pipe, wherein the second directional grouting steel pipe is detachably connected to the end of the first directional grouting steel pipe; the first directional grouting steel pipe and the second directional grouting steel pipe are respectively and evenly provided with a plurality of slurry outlet holes in the middle and rear parts, the first directional grouting steel pipe and the second directional grouting steel pipe are respectively bonded to the two ends of an annular damping device, and the annular damping device covers the plurality of the slurry outlet holes; the cross-sectional area of ​​the annular damping device gradually decreases along the axial direction of the first directional grouting steel pipe and the second directional grouting steel pipe.

[0010] In an optional embodiment, the end of the annular damping device with a larger cross-sectional area is close to the front end of the first directional grouting steel pipe or the second directional grouting steel pipe, and the end of the annular damping device with a smaller cross-sectional area is close to the end of the first directional grouting steel pipe or the second directional grouting steel pipe.

[0011] In an optional embodiment, the bonding strength between the end of the annular damping device with a larger cross-sectional area and the corresponding directional grouting steel pipe is greater than the bonding strength between the end of the annular damping device with a smaller cross-sectional area and the corresponding directional grouting steel pipe.

[0012] In an optional embodiment, in a non-grouting state, the annular damping device is elliptical; in a grouting state, an end of the annular damping device with a small cross-sectional area is pushed open, and the annular damping device gradually becomes conical.

[0013] In an optional embodiment, the outer surface of each of the annular damping devices is provided with a plurality of damping barbs.

[0014] In an optional embodiment, the annular damping device and the damping barbs are both made of rubber material, and the material strength of the damping barbs is greater than the material strength of the annular damping device.

[0015] In an optional embodiment, a grouting valve is provided at the front end of the grouting pipe rod body of the first directional grouting steel pipe, and a female thread is provided at the end of the grouting pipe rod body of the first directional grouting steel pipe.

[0016] In an optional embodiment, a front end of the grouting pipe rod body of the second directional grouting steel pipe is provided with a male thread, and a terminal end of the grouting pipe rod body of the second directional grouting steel pipe is provided with a female thread.

[0017] In an optional embodiment, the female threaded connection sealing member is provided at the end of the grouting pipe rod body of the second directional grouting steel pipe.

[0018] The beneficial effects of the utility model are as follows: the grouting steel pipe utilizes the slurry's own pressure to compress the annular damping device and the damping barbs on its upper part to seal the hole, which can solve the problems of slurry leakage and slurry leakage; when the slurry is pumped out from the slurry outlet hole of the grouting pipe, the slurry can be isolated by the annular damping device, and the high-pressure slurry can only be directionally injected into the fractured zone that needs to be reinforced, thereby realizing directional grouting of the fault fracture zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art 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 work.

[0020] Figure 1 This is a schematic structural diagram of a first directional grouting steel pipe provided in one embodiment of the utility model.

[0021] Figure 2 This is a schematic structural diagram of a first directional grouting steel pipe provided in one embodiment of the utility model.

[0022] Figure 3 It is a schematic diagram of the usage status of the sealing-free overlap-type directional grouting steel pipe provided in one embodiment of the utility model.

[0023] Wherein, the accompanying drawings are marked as follows:

[0024] 1. Grouting port; 2. Grouting pipe rod; 3. Damping barb; 4. Female thread; 5. Grouting hole; 6. Annular damping device; 7. Grouting valve; 8. Male thread; 9. Fracture zone; 10. Slurry; 11. Coal rock mass. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0027] Please see attached Figure 1-3 The purpose of this embodiment is to provide a sealing-free overlapped directional grouting steel pipe, comprising: a first directional grouting steel pipe and a second directional grouting steel pipe, wherein the second directional grouting steel pipe is detachably connected to the end of the first directional grouting steel pipe; a plurality of grouting holes 5 are evenly arranged in the middle and rear parts of the first directional grouting steel pipe and the second directional grouting steel pipe, respectively, the first directional grouting steel pipe and the second directional grouting steel pipe are respectively bonded to the two ends of an annular damping device 6, the annular damping device 6 covers the plurality of grouting holes 5, the grouting holes 5 on the first directional grouting steel pipe are used in conjunction with the annular damping device 6 on the first directional grouting steel pipe, and the grouting holes 5 on the second directional grouting steel pipe are used in conjunction with the annular damping device 6 on the second directional grouting steel pipe.

[0028] Specifically, the cross-sectional area of ​​the annular damping device 6 gradually decreases along the axial direction of the first directional grouting steel pipe and the second directional grouting steel pipe. In this embodiment, the end of the annular damping device 6 with a large cross-sectional area is close to the front end of the first directional grouting steel pipe, and the end of the annular damping device 6 with a small cross-sectional area is close to the end of the first directional grouting steel pipe; the end of the annular damping device 6 with a large cross-sectional area is close to the front end of the second directional grouting steel pipe, and the end of the annular damping device 6 with a small cross-sectional area is close to the end of the second directional grouting steel pipe. It should be pointed out that the bonding strength between the end of the annular damping device 6 with a larger cross-sectional area and the first directional grouting steel pipe is greater than the bonding strength between the end of the annular damping device 6 with a smaller cross-sectional area and the first directional grouting steel pipe, and the bonding strength between the end of the annular damping device 6 with a larger cross-sectional area and the second directional grouting steel pipe is greater than the bonding strength between the end of the annular damping device 6 with a smaller cross-sectional area and the second directional grouting steel pipe. The bonding strength is mainly related to the size of the bonding area and the adhesive used. When the same adhesive is used, the larger the bonding area, the greater the bonding strength. The purpose of directional grouting is achieved under the sealing effect of the two annular damping devices 6.

[0029] Furthermore, in the non-grouting state, the annular damping device 6 is elliptical; in the grouting state, the end of the annular damping device 6 with a small cross-sectional area is pushed open, and the annular damping device 6 gradually becomes conical. A plurality of damping barbs 3 are provided on the outer surface of each annular damping device 6. The damping barbs 3 are tightly attached to the borehole wall and can have a great grip on the borehole wall, so that the annular damping device 6 can achieve a sealing effect to achieve the effect of sealing the hole. Preferably, the annular damping device 6 and the damping barbs 3 are both made of rubber, and the material strength of the damping barbs 3 is greater than the material strength of the annular damping device 6.

[0030] In addition, the front end of the grouting pipe rod body 2 of the first directional grouting steel pipe is provided with a grouting valve 7, and the end of the grouting pipe rod body 2 of the first directional grouting steel pipe is provided with a female thread 4. The front end of the grouting pipe rod body 2 of the second directional grouting steel pipe is provided with a male thread, and the end of the grouting pipe rod body 2 of the second directional grouting steel pipe is provided with a female thread 4. When in use, the number and length of the first directional grouting steel pipe and the length of the second directional grouting steel pipe can be selected according to actual conditions, the second directional grouting steel pipe is located at the end, and the female thread 4 at the end of the grouting pipe rod body 2 of the second directional grouting steel pipe is connected to the plugging piece.

[0031] During construction, grouting holes are first arranged horizontally along the working face in the tunnel, and the depth of the grouting holes is sufficient to pass through the fractured zone; then the assembled directional grouting steel pipe is inserted into the grouting hole, and the depth of the insertion is sufficient to ensure that the slurry outlet hole 5 is located at the location of the fault, and the location of the slurry outlet hole 5 is as close to the location of the fault as possible; the slurry in the grouting pipe is pumped out from the slurry outlet hole 5, and the high-pressure slurry 10 pushes open the position with a small adhesion area in the annular damping device 6, so that the annular damping device 6 gradually changes into a cone shape. At the same time, the damping barbs 3 are tightly attached to the borehole wall and have a great grip on the borehole wall, so that the annular damping device 6 can achieve a sealing effect, thereby achieving the sealing effect. Finally, under the sealing effect of the annular damping device 6, the slurry 01 is directionally injected into the fractured zone 9 that needs to be reinforced, thereby achieving directional grouting.

[0032] Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included in the protection scope of this utility model.

Claims

1. A sealing-free overlapped directional grouting steel pipe, comprising: A first directional grouting steel pipe and a second directional grouting steel pipe, wherein the second directional grouting steel pipe is detachably connected to the end of the first directional grouting steel pipe; The invention is characterized in that a plurality of grouting holes (5) are evenly arranged at the middle and rear parts of the first directional grouting steel pipe and the second directional grouting steel pipe, respectively, and the first directional grouting steel pipe and the second directional grouting steel pipe are respectively bonded to the two ends of an annular damping device (6), and the annular damping device (6) covers the plurality of grouting holes (5); The cross-sectional area of ​​the annular damping device (6) gradually decreases along the axial direction of the first directional grouting steel pipe and the second directional grouting steel pipe.

2. The sealing-free overlapped directional grouting steel pipe according to claim 1 is characterized in that: The end of the annular damping device (6) with a larger cross-sectional area is close to the front end of the first directional grouting steel pipe or the second directional grouting steel pipe, and the end of the annular damping device (6) with a smaller cross-sectional area is close to the end of the first directional grouting steel pipe or the second directional grouting steel pipe.

3. The sealing-free overlapped directional grouting steel pipe according to claim 2 is characterized in that: The bonding strength between the end of the annular damping device (6) with a larger cross-sectional area and the corresponding directional grouting steel pipe is greater than the bonding strength between the end of the annular damping device (6) with a smaller cross-sectional area and the corresponding directional grouting steel pipe.

4. The sealing-free overlapped directional grouting steel pipe according to claim 3 is characterized in that: In the non-grouting state, the annular damping device (6) is elliptical; in the grouting state, the end of the annular damping device (6) with a small cross-sectional area is pushed open, and the annular damping device (6) gradually becomes conical.

5. The sealing-free overlapped directional grouting steel pipe according to claim 1, characterized in that: The outer surface of each annular damping device (6) is provided with a plurality of damping barbs (3).

6. The sealing-free overlapped directional grouting steel pipe according to claim 5, characterized in that: The annular damping device (6) and the damping barbs (3) are both made of rubber material, and the material strength of the damping barbs (3) is greater than the material strength of the annular damping device (6).

7. The sealing-free overlapped directional grouting steel pipe according to claim 1, characterized in that: A grouting valve (7) is provided at the front end of the grouting pipe rod body (2) of the first directional grouting steel pipe, and a female thread (4) is provided at the end of the grouting pipe rod body (2) of the first directional grouting steel pipe.

8. The sealing-free overlapped directional grouting steel pipe according to claim 7, characterized in that: The front end of the grouting pipe rod body (2) of the second directional grouting steel pipe is provided with a male thread, and the end of the grouting pipe rod body (2) of the second directional grouting steel pipe is provided with a female thread (4).

9. The sealing-free overlapped directional grouting steel pipe according to claim 8, characterized in that: The female thread (4) at the end of the grouting pipe rod body (2) of the second directional grouting steel pipe is connected to the plugging piece.

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