Non-uniform settlement monitoring device for backfilling in open pit coal mine goaf

Abstract

The utility model provides an open-pit coal mine goaf backfill differential settlement monitoring device, a rock layer and a clay layer are arranged above a coal mine goaf, a monitoring hole is formed in the clay layer, a grouting body is arranged in the monitoring hole, the monitoring device comprises a positioning pipe, the positioning pipe is vertically fixed in the grouting body, and the grouting body is arranged in the positioning pipe. A detachable sealing plug is fixed to the top of the positioning pipe, and a limiting hole is formed in the sealing plug. The monitoring rod is connected to the interior of the positioning pipe, a connector is fixed to the bottom of the monitoring rod, a threaded section is arranged on the connector, and the monitoring rod is slidably connected to the interior of the sealing plug; and a connecting cylinder, a fixing hole is arranged in the rock layer, the connecting cylinder is fixed in the fixing hole, and the inner wall of the connecting cylinder is provided with an internal thread matched with the connector.

Description

Technical Field

[0001] This invention relates to the field of settlement monitoring, and in particular to a device for monitoring uneven settlement of backfill in open-pit coal mine goaf areas. Background Technology

[0002] With the continuous expansion of open-pit coal mining in my country, the subsidence problem after backfilling of mined-out areas has become increasingly prominent, posing a serious threat to the safety and subsequent utilization of mining areas. After mining ceases, subsidence in mined-out areas can not only damage surface buildings, roads, and other infrastructure, but also trigger geological disasters such as ground collapses and fissures, posing significant risks to the ecological environment and the safety of people's lives and property in and around the mining area. Therefore, real-time and accurate monitoring of subsidence in open-pit coal mine mined-out areas after backfilling is of paramount importance.

[0003] Currently, monitoring of goaf areas typically involves fixing a positioning tube in the clay layer of the goaf, inserting a monitoring rod into the positioning tube, and connecting the monitoring rod to the rock layer. The displacement of the top of the monitoring rod is measured using a level and a ruler next to the monitoring rod to determine the settlement status of the goaf. However, this method is prone to problems. The positioning tube is easily blocked by soil and gravel, and the connection between the monitoring rod and the rock layer is weak, which can easily lead to the bottom of the monitoring rod detaching from the rock layer, making it impossible to accurately detect the settlement status. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a monitoring device for uneven settlement of backfill in open-pit coal mine goaf. This settlement monitoring device has a simple structure and can effectively prevent sand and rainwater from entering the positioning pipe and causing it to become stuck or deformed when monitoring the settlement state of the coal mine rock layer, thus ensuring the accuracy of the monitoring results.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a monitoring device for uneven settlement of backfill in an open-pit coal mine goaf, wherein a rock layer and a clay layer exist above the coal mine goaf, a monitoring hole is formed in the clay layer, and a grouting body is provided in the monitoring hole, comprising:

[0006] A positioning tube is vertically fixed in the grouting body, and a removable sealing plug is fixed at the top of the positioning tube, the sealing plug having a limiting hole.

[0007] A monitoring rod is connected to a positioning tube. A connector is fixed at the bottom of the monitoring rod. The connector has a threaded section. The monitoring rod passes through the limiting hole of the sealing plug.

[0008] A connecting cylinder is provided, wherein a fixing hole is formed in the rock layer, the connecting cylinder is fixed in the fixing hole, and an internal thread matching the connecting head is provided on the inner wall of the connecting cylinder. The monitoring rod is threadedly connected to the connecting cylinder through the connecting head.

[0009] Furthermore, the top of the positioning tube has a connecting ring with multiple connecting holes, and the top of the grouting body has multiple threaded holes. The positioning tube is fixed in the threaded holes through the connecting ring.

[0010] Furthermore, the sealing plug is made of silicone and has a limiting ring on its edge.

[0011] Furthermore, the outer wall of the connecting cylinder is inclined at an angle.

[0012] Furthermore, an annular foam pad is provided between the grout and the rock layer.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The settlement monitoring device has a simple structure and can effectively prevent sand and rainwater from entering the positioning tube and causing the positioning tube to become stuck or deformed when monitoring the settlement state of the coal mine rock layer.

[0015] 2. Since the positioning tube is fixed to the grouting body by the connecting ring, it can be disassembled. At the same time, the monitoring rod can also be disassembled from the connecting tube, so that the monitoring device can be reused and the cost is lower.

[0016] 3. By setting an inclined angle on the outer wall of the connecting cylinder, the outer wall can have a guiding function, so that the connecting cylinder can enter the fixing hole more smoothly and conveniently. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present invention in use;

[0018] Figure 2 This is a utility model Figure 1 Enlarged view of section A;

[0019] Figure 3 This is a utility model Figure 1 Enlarged view of section B;

[0020] In the diagram: 1. Clay layer; 2. Goaf; 3. Rock layer; 4. Grouting body; 5. Fixing hole; 6. Positioning pipe; 7. Monitoring rod; 8. Limiting ring; 9. Sealing plug; 10. Connecting cylinder; 11. Connecting head; 12. Foam pad; 13. Connecting ring; 14. Connecting hole; Detailed Implementation

[0021] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figures 1 to 3 The open-pit coal mine goaf backfill uneven settlement monitoring device shown has a rock layer 3 and a clay layer 1 above the coal mine goaf 2. A monitoring hole is opened in the clay layer 1, and a grouting body 4 is installed in the monitoring hole, including:

[0023] A positioning tube 6 is vertically fixed in the grouting body 4. A removable sealing plug 9 is fixed at the top of the positioning tube 6. A limiting hole is provided in the sealing plug 9.

[0024] A monitoring rod 7 is connected in a positioning tube 6. A connector 11 is fixed at the bottom of the monitoring rod 7. The connector 11 has a threaded section. The monitoring rod 7 passes through the limiting hole 9 of the sealing plug.

[0025] A connecting cylinder 10 is provided, and a fixing hole is opened in the rock layer 3. The connecting cylinder 10 is fixed in the fixing hole. The inner wall of the connecting cylinder 10 is provided with an internal thread that matches the connecting head 11. The monitoring rod is threadedly connected to the connecting cylinder 10 through the connecting head 11.

[0026] The process of using this utility model is as follows: First, a monitoring hole is opened in the clay layer 1. Then, a fixing hole is drilled at the bottom of the monitoring hole, and the connecting cylinder 10 is fixed in the fixing hole. The connecting cylinder 10 can be moved into the fixing hole by the inner support clamp and then fixed by hammering. Then, a plastic sleeve is set in the monitoring hole, and a release agent is applied to the surface of the plastic sleeve. Grout is injected between the plastic sleeve and the monitoring hole to form a grout body 4. After the grout body 4 solidifies, the plastic sleeve is removed, and the monitoring rod 7 is threaded into the connecting cylinder 10 through the connector 11 on it, so that the monitoring rod and the rock layer form a stable connection. Finally, the positioning tube 6 is installed. The positioning tube 6 passes through the top of the monitoring rod 7. After the positioning tube 6 is installed, the sealing plug 9 is connected. In this way, rainwater or dust can be effectively prevented from entering and the monitoring rod 7 will not be stuck. When the rock layer settles, it can drive the monitoring rod to move. The displacement status of the monitoring rod can be accurately supplemented by the level. In this way, the monitoring device can be disassembled and recycled later for reuse. Compared to traditional methods, the structure of this invention features a weak connection between the monitoring rod and the rock layer. If the rock layer settles after the monitoring rod becomes stuck, it is easy for the monitoring rod to detach from the rock layer, failing to achieve accurate monitoring.

[0027] Furthermore, the top of the positioning tube 6 has a connecting ring 13, and the connecting ring has multiple connecting holes 14. The top of the grouting body 4 is fixed with multiple threaded holes, and the positioning tube 6 is fixed in the threaded holes by the connecting ring 13. Specifically, in this invention, the top of the positioning tube 6 is fixed with a connecting ring 13, and the connecting ring 13 has connecting holes, so the positioning tube 6 can be fixed to the grouting body 4 with screws. This method is also more convenient for disassembly later.

[0028] Furthermore, the sealing plug 9 is made of silicone, and a limiting ring 8 is provided on the edge of the sealing plug 9. Specifically, the sealing plug 9 of this utility model is made of silicone, which has good ductility and can make close contact with the detection tube, thereby preventing dust, rainwater, and dirt from entering the positioning tube 6.

[0029] Furthermore, the outer wall of the connecting cylinder 10 is inclined at an angle. Specifically, the present invention provides an inclined angle on the outer wall of the connecting cylinder 10, so that the outer wall of the connecting cylinder 10 has a certain slope. In this way, when the connecting cylinder 10 is connected to the fixing hole, its outer wall can guide it, making it easier for the connecting cylinder 10 to enter the fixing hole.

[0030] Furthermore, an annular foam pad 12 is provided between the grouting body 4 and the rock layer 3. Because of the foam pad 12 between the grouting body 4 and the rock layer 3, the grouting body 4 and the rock layer 3 will not stick together. When the rock layer 3 settles, the grouting body will still be tightly connected to the clay layer and will not affect the grouting body 4.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A monitoring device for uneven settlement of backfill in an open-pit coal mine goaf, installed in the rock and clay layers above the goaf, wherein a monitoring hole is formed in the clay layer and a grouting body is provided in the monitoring hole, characterized in that, include: A positioning tube is vertically arranged and fixed in the grouting body. A removable sealing plug is fixed at the top of the positioning tube, and a limiting hole is provided in the sealing plug. A monitoring rod is connected to a positioning tube. A connector is fixed at the bottom of the monitoring rod. The connector has a threaded section. The monitoring rod passes through the limiting hole of the sealing plug. A connecting cylinder is provided, wherein a fixing hole is formed in the rock layer, the connecting cylinder is fixed in the fixing hole, and an internal thread matching the connecting head is provided on the inner wall of the connecting cylinder. The monitoring rod is threadedly connected to the connecting cylinder through the connecting head.

2. The monitoring device for uneven settlement of backfill in open-pit coal mine goaf according to claim 1, characterized in that: The top of the positioning tube has a connecting ring with multiple connecting holes. The top of the grouting body has multiple threaded holes, and the positioning tube is fixed in the threaded holes through the connecting ring.

3. The monitoring device for uneven settlement of backfill in open-pit coal mine goaf according to claim 2, characterized in that: The sealing plug is made of silicone and has a limiting ring on its edge.

4. The monitoring device for uneven settlement of backfill in open-pit coal mine goaf according to claim 3, characterized in that: The outer wall of the connecting cylinder is inclined at an angle.

5. The monitoring device for uneven settlement of backfill in open-pit coal mine goaf according to claim 4, characterized in that: There is also an annular foam pad between the grout and the rock layer.

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