Ground grouting process and grouting structure for coal mining

Abstract

The grouting structure comprises the ground, a first sleeve, a second sleeve and a vibrator, the ground comprises a quaternary unconsolidated formation, a stable bedrock layer and a coal seam, the quaternary unconsolidated formation is provided with a first drill hole, the stable bedrock layer is provided with a second drill hole, the coal seam is provided with a third drill hole, and the first drill hole is communicated with the second drill hole. The first casing pipe is arranged in the first drill hole, a first grouting channel is formed in the pipe wall of the first casing pipe, an inlet of the first grouting channel communicates with a first grouting pipeline, an outlet of the first grouting channel is provided with an electromagnetic valve, a lifting rope is arranged on the side wall of the vibrator, and a threaded rod is arranged on the side wall of the vibrator. The threaded rod is matched with a threaded extension sleeve, the threaded extension sleeve abuts against the inner wall of the first sleeve and the inner wall of the second sleeve, a tight cement paste solid layer structure is formed through vibration exhaust treatment, and the strength and stability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling grouting, in particular to a coal mining surface grouting process and a grouting structure. Background Art

[0002] How to control the borehole to pass through the goaf and the broken roof zone smoothly during ground drilling construction is an important issue that needs in-depth research. When the borehole passes through the broken roof zone, it will face a series of technical problems such as leakage of flushing fluid due to rock mass crushing, drill buried accidents caused by the rock powder formed by drilling in the hole cannot be normally brought out of the hole, drill burning caused by failure to respond to drill tool damage in time, and drilling accidents (drill stuck, drill buried) caused by collapse and falling of the hole wall.

[0003] In the existing drilling and grouting structure, since the cement slurry is injected into a narrow gap, it is not possible to remove bubbles from the injected cement after grouting, which affects the compactness of the cement slurry solid layer and the strength is unstable. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above-mentioned and / or existing problems in the use of high performance concrete devices for bridge construction, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a high-performance concrete device for bridge construction. By opening a first grouting channel in the pipe wall, cement slurry is conveniently injected from bottom to top between the first casing and the first borehole to reduce the entry of bubbles. By opening a second grouting channel in the pipe wall, cement slurry is conveniently injected from bottom to top between the second casing and the second borehole to reduce the entry of bubbles. The suspension rope can be extended to different depths. When the first cement slurry solid layer and the second cement slurry solid layer are just injected, vibration exhaust treatment is performed to further reduce internal bubbles, form a tight cement slurry solid layer structure, and improve strength and stability.

[0007] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A coal mining ground grouting structure, comprising:

[0009] The ground comprises a Quaternary loose layer, a stable bedrock layer and a coal seam, the Quaternary loose layer is provided with a first borehole, the stable bedrock layer is provided with a second borehole, and the coal seam is provided with a third borehole;

[0010] A first casing, wherein the first casing is arranged inside the first borehole, a first grouting channel is arranged on a wall of the first casing, an inlet of the first grouting channel is connected to a first grouting pipeline, and an outlet of the first grouting channel is arranged with a solenoid valve;

[0011] A second sleeve, wherein the top of the second sleeve is provided with a threaded interface matched with the bottom of the first sleeve, the tube wall of the second sleeve is provided with a second grouting channel, the inlet of the second grouting channel is provided with a second grouting pipe, and the outlet of the second grouting channel is provided with a solenoid valve;

[0012] A vibrator, wherein a hanging rope is arranged on the side wall of the vibrator, a threaded rod is arranged on the side wall of the vibrator, the threaded rod is matched with a threaded extension sleeve, and the threaded extension sleeve is pressed against the inner walls of the first sleeve and the second sleeve.

[0013] As a preferred solution of the coal mining surface grouting structure described in the present invention, a fixing ring is provided on the top of the first casing, and a fixing hole is provided on the side wall of the fixing ring.

[0014] As a preferred solution of the coal mining surface grouting structure described in the present invention, the outer wall of the first casing and the inner wall of the first borehole are provided with a first cement slurry solid layer, and the outer wall of the second casing and the inner wall of the second borehole are provided with a second cement slurry layer.

[0015] As a preferred solution of the coal mining surface grouting structure described in the present invention, the side wall of the threaded extension sleeve is provided with an adjusting nut, and the adjusting nut cooperates with the threaded rod.

[0016] A coal mining ground grouting process, comprising:

[0017] S1. Use a drilling machine to drill holes in the fourth loose layer and the stable bedrock layer, and then log the wells;

[0018] S2, using a reamer to expand a first borehole in the Quaternary loose layer, lowering a first casing into the first borehole, and fixing it on the ground with a fixing plate;

[0019] S3, opening the solenoid valve at the outlet of the first grouting channel, injecting cement mortar from the first grouting pipe into the first grouting channel, and the cement mortar enters between the first borehole and the first casing. After the mortar is filled, the solenoid valve is closed, and the cement mortar in the first grouting pipe and the first grouting channel is extracted;

[0020] S4, placing a vibrator inside the first casing, making the threaded extension sleeve close to the inner wall of the first casing, starting the vibrator, vibrating and exhausting the cement mortar between the first borehole and the first casing, and waiting for the cement mortar to solidify to form a first cement mortar solid layer;

[0021] S5, using a reamer to expand a second borehole in the bedrock layer, assembling a second casing with the bottom of the first casing, and placing the second casing into the second borehole;

[0022] S6, open the solenoid valve at the outlet of the second grouting channel, inject cement mortar from the second grouting pipe into the second grouting channel, the cement mortar enters between the second borehole and the second casing, close the solenoid valve after filling, and extract the cement mortar in the second grouting pipe and the second grouting channel;

[0023] S7, placing a vibrator inside the second casing, making the threaded extension sleeve close to the inner wall of the second casing, starting the vibrator, and vibrating and exhausting the cement mortar between the second borehole and the second casing, and waiting for the cement mortar to solidify to form a second cement mortar solid layer.

[0024] Compared with the prior art, the present invention has the following beneficial effects: this coal mining surface grouting process and grouting structure, by opening a first grouting channel in the pipe wall, facilitates the injection of cement slurry from bottom to top between the first casing and the first borehole, reducing the entry of bubbles; by opening a second grouting channel in the pipe wall, facilitates the injection of cement slurry from bottom to top between the second casing and the second borehole, reducing the entry of bubbles; the suspension rope can be extended to different depths, and vibration exhaust treatment is performed when the first cement slurry solid layer and the second cement slurry solid layer are just injected, so as to further reduce internal bubbles, form a tight cement slurry solid layer structure, and improve strength and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. 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 creative labor. Among them:

[0026] Figure 1 It is a schematic diagram of the overall structure of a coal mining surface grouting process and a grouting structure according to the present invention;

[0027] Figure 2 It is a schematic diagram of the cross-section structure of a coal mining surface grouting process and a grouting structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the first casing part of a coal mining surface grouting process and a grouting structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the second casing part of a coal mining surface grouting process and a grouting structure of the present invention;

[0030] Figure 5The present invention is a schematic diagram of the structure of the vibrator part of a coal mining surface grouting process and a grouting structure.

[0031] 100, ground; 110, Quaternary loose layer; 111, first borehole; 112, first cement slurry solid layer; 120, bedrock layer; 121, second borehole; 122, second cement slurry solid layer; 130, coal seam; 131, third borehole; 200, first casing; 210, first grouting pipe; 220, first grouting channel; 221, solenoid valve; 230, fixing plate; 231, fixing hole; 300, second casing; 310, second grouting pipe; 320, second grouting channel; 330, threaded interface; 400, vibrator; 410, suspension rope; 420, threaded rod; 430, threaded extension pipe; 440, adjusting nut. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged at a general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The present invention provides a coal mining surface grouting process and a grouting structure. A first grouting channel is opened in a pipe wall to facilitate the injection of cement slurry from bottom to top between a first casing and a first borehole, thereby reducing the entry of bubbles. A second grouting channel is opened in the pipe wall to facilitate the injection of cement slurry from bottom to top between a second casing and a second borehole, thereby reducing the entry of bubbles. A suspension rope can be extended to different depths. When the first cement slurry solid layer and the second cement slurry solid layer are just injected, vibration exhaust treatment is performed to further reduce internal bubbles, form a compact cement slurry solid layer structure, and improve strength and stability.

[0036] Figure 1-Figure 5 The structure diagram of a coal mining ground grouting structure according to the present invention is shown. Figure 1-Figure 5 In this embodiment, a high performance concrete device for bridge construction includes a main body including a ground 100 , a first casing 200 , a second casing 300 and a vibrator 400 .

[0037] After the ground 100 is drilled by a drilling machine, the hole is expanded by a reamer to reach a required hole diameter. Specifically, the ground 100 includes a Quaternary loose layer 110, a stable bedrock layer 120 and a coal seam 130. The Quaternary loose layer 110 is provided with a first borehole 111, the stable bedrock layer 120 is provided with a second borehole 121, and the coal seam 130 is provided with a third borehole 131;

[0038] The first casing 200 is provided with a first grouting channel 220 in the pipe wall, so that cement slurry is injected from bottom to top between the first casing 200 and the first borehole 111, thereby reducing the entry of bubbles. Specifically, the first casing 200 is arranged inside the first borehole 111, the pipe wall of the first casing 200 is provided with a first grouting channel 220, the inlet of the first grouting channel 220 is connected with the first grouting pipeline 210, and the outlet of the first grouting channel 220 is provided with a solenoid valve 221. In this embodiment, a fixing ring is provided at the top of the first casing 200, and a fixing hole 231 is provided on the side wall of the fixing ring. The outer wall of the first casing 200 and the inner wall of the first borehole 111 are provided with a first cement slurry solid layer 112;

[0039] The second casing 300 is provided with a second grouting channel 320 in the pipe wall, so that cement slurry is injected from bottom to top between the second casing 300 and the second borehole 121, thereby reducing the entry of bubbles. Specifically, a threaded interface 330 matching the bottom of the first casing 200 is provided at the top of the second casing 300, and a second grouting channel 320 is provided on the pipe wall of the second casing 300. A second grouting pipe 310 is provided at the inlet of the second grouting channel 320, and a solenoid valve 221 is provided at the outlet of the second grouting channel 320. In this embodiment, a second cement slurry layer is provided on the outer wall of the second casing 300 and the inner wall of the second borehole 121.

[0040] The vibrator 400 can be extended to different depths through the hanging rope 410. When the first cement slurry solid layer 112 and the second cement slurry solid layer 122 are just injected, vibration exhaust treatment is performed to further reduce internal bubbles, form a tight cement slurry solid layer structure, and improve strength and stability. Specifically, the side wall of the vibrator 400 is provided with a hanging rope 410, and the side wall of the vibrator 400 is provided with a threaded rod 420. The threaded rod 420 is matched with a threaded extension sleeve 430, and the threaded extension sleeve 430 is pressed against the inner walls of the first sleeve 200 and the second sleeve 300. In this embodiment, the side wall of the threaded extension sleeve 430 is provided with an adjusting nut 440, and the adjusting nut 440 is matched with the threaded rod 420.

[0041] A coal mining surface 100 grouting process, comprising:

[0042] S1, drilling holes in the fourth loose layer and the stable bedrock layer 120 with a drilling machine, and then logging;

[0043] S2, using a reamer to expand a first borehole 111 in the Quaternary loose layer 110, lowering a first casing 200 into the first borehole 111, and fixing it on the ground 100 using a fixing plate 230;

[0044] S3, open the solenoid valve 221 at the outlet of the first grouting channel 220, inject cement mortar from the first grouting pipe 210 into the first grouting channel 220, and the cement mortar enters between the first borehole 111 and the first casing 200. After the mortar is filled, close the solenoid valve 221, and extract the cement mortar in the first grouting pipe 210 and the first grouting channel 220;

[0045] S4, placing the vibrator 400 inside the first casing 200, making the threaded extension sleeve 430 close to the inner wall of the first casing 200, starting the vibrator 400, vibrating and exhausting the cement mortar between the first borehole 111 and the first casing 200, and waiting for the cement mortar to solidify to form a first cement mortar solid layer 112;

[0046] S5, using a reamer to expand a second borehole 121 in the bedrock layer 120, assembling the second casing 300 with the bottom of the first casing 200, and placing the second borehole 121;

[0047] S6, open the solenoid valve 221 at the outlet of the second grouting channel 320, inject cement mortar from the second grouting pipe 310 into the second grouting channel 320, and the cement mortar enters between the second borehole 121 and the second casing 300. After the mortar is filled, close the solenoid valve 221, and extract the cement mortar in the second grouting pipe 310 and the second grouting channel 320;

[0048] S7, placing the vibrator 400 inside the second casing 300, making the threaded extension sleeve 430 press against the inner wall of the second casing 300, starting the vibrator 400, vibrating and exhausting the cement mortar between the second borehole 121 and the second casing 300, and waiting for the cement mortar to solidify to form a second cement mortar solid layer 122.

[0049] Combination Figure 1-Figure 5The present embodiment is a coal mining surface grouting process and grouting structure. The specific use process is as follows: by opening a first grouting channel 220 in the pipe wall, it is convenient to inject cement slurry from bottom to top between the first casing 200 and the first borehole 111, and reduce the entry of bubbles. By opening a second grouting channel 320 in the pipe wall, it is convenient to inject cement slurry from bottom to top between the second casing 300 and the second borehole 121, and reduce the entry of bubbles. The suspension rope 410 can be extended to different depths. When the first cement slurry solid layer 112 and the second cement slurry solid layer 122 are just injected, vibration exhaust treatment is performed to further reduce internal bubbles, form a compact cement slurry solid layer structure, and improve strength and stability.

[0050] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coal mining ground grouting structure, characterized in that: include: A ground surface (100), the ground surface (100) comprising a Quaternary loose layer (110), a stable bedrock layer (120) and a coal seam (130), the Quaternary loose layer (110) being provided with a first borehole (111), the stable bedrock layer (120) being provided with a second borehole (121), and the coal seam (130) being provided with a third borehole (131); A first casing (200), the first casing (200) being arranged inside the first borehole (111), a first grouting channel (220) being arranged on a wall of the first casing (200), an inlet of the first grouting channel (220) being connected to a first grouting pipeline (210), and an outlet of the first grouting channel (220) being arranged with a solenoid valve (221); A second sleeve (300), wherein a threaded interface (330) matching with the bottom of the first sleeve (200) is arranged at the top of the second sleeve (300), a second grouting channel (320) is arranged on the wall of the second sleeve (300), a second grouting pipe (310) is arranged at the inlet of the second grouting channel (320), and a solenoid valve (221) is arranged at the outlet of the second grouting channel (320); A vibrator (400), wherein a hanging rope (410) is disposed on a side wall of the vibrator (400), a threaded rod (420) is disposed on a side wall of the vibrator (400), the threaded rod (420) is matched with a threaded extension sleeve (430), and the threaded extension sleeve (430) is pressed against the inner walls of the first sleeve (200) and the second sleeve (300).

2. A coal mining ground grouting structure according to claim 1, characterized in that: A fixing ring is provided at the top of the first sleeve (200), and a fixing hole (231) is provided on the side wall of the fixing ring.

3. A coal mining ground grouting structure according to claim 2, characterized in that: A first cement slurry solidification layer (112) is provided on the outer wall of the first casing (200) and the inner wall of the first borehole (111), and a second cement slurry layer is provided on the outer wall of the second casing (300) and the inner wall of the second borehole (121).

4. A coal mining ground grouting structure according to claim 3, characterized in that: The side wall of the threaded extension sleeve (430) is provided with an adjusting nut (440), and the adjusting nut (440) cooperates with the threaded rod (420).

5. A coal mining ground grouting process, characterized in that: include: S1, drilling holes in the fourth loose layer and the stable bedrock layer (120) using a drilling machine, and then logging; S2, using a reamer to expand a first borehole (111) in the Quaternary loose layer (110), lowering a first casing (200) into the first borehole (111), and fixing it on the ground (100) using a fixing plate (230); S3, opening the electromagnetic valve (221) at the outlet of the first grouting channel (220), injecting cement mortar from the first grouting pipe (210) into the first grouting channel (220), and allowing the cement mortar to enter between the first borehole (111) and the first casing (200); after the mortar is filled, closing the electromagnetic valve (221), and extracting the cement mortar from the first grouting pipe (210) and the first grouting channel (220); S4, placing the vibrator (400) inside the first casing (200), making the threaded extension sleeve (430) close to the inner wall of the first casing (200), starting the vibrator (400), vibrating and exhausting the cement mortar between the first borehole (111) and the first casing (200), and waiting for the cement mortar to solidify to form a first cement mortar solid layer (112); S5, using a reamer to expand a second borehole (121) in the bedrock layer (120), assembling the second casing (300) with the bottom of the first casing (200), and placing the second borehole (121); S6, opening the electromagnetic valve (221) at the outlet of the second grouting channel (320), injecting cement mortar from the second grouting pipe (310) into the second grouting channel (320), and allowing the cement mortar to enter between the second borehole (121) and the second casing (300); after the mortar is filled, closing the electromagnetic valve (221), and extracting the cement mortar from the second grouting pipe (310) and the second grouting channel (320); S7, placing the vibrator (400) inside the second casing (300), making the threaded extension sleeve (430) close to the inner wall of the second casing (300), starting the vibrator (400), vibrating and exhausting the cement mortar between the second borehole (121) and the second casing (300), and waiting for the cement mortar to solidify to form a second cement mortar solid layer (122).

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