Hole plugging device suitable for gas rock breaking of metro foundation pit in sandstone stratum

Abstract

The utility model provides a hole plugging device suitable for sandstone stratum subway foundation pit gas rock breaking, and relates to the field of blasting, the hole plugging device comprises a hole plugging column, the hole plugging column comprises a threaded rod body, a protruding part is arranged on the threaded rod body, a plurality of tooth wings are arranged at the bottom of the threaded rod body, the tooth wings are arranged in an annular array in the axial direction of the threaded rod body, and the tooth wings are used for being in lap joint with a hole wall; the column cap comprises a sleeve used for being connected to the screw rod body in a threaded mode, a cover body used for covering the protruding part is arranged at the bottom of the sleeve, during blasting, gas instantly expands from the cracking hole to form high-pressure gas, the high-pressure gas pushes the hole plugging device to move towards the position away from a blasting point, at the moment, the tooth wings are inserted into the hole wall under the action of impact force, and the hole plugging device is formed. The first acting force is provided for fixing the hole plugging column, meanwhile, the fracturing hole is plugged by the protruding part and the cover body, friction force is generated among the protruding part, the cover body and the hole wall in the blasting process, the second acting force is provided for fixing the hole plugging column, and the hole plugging column is prevented from rushing out of the fracturing hole.

Description

Technical Field

[0001] The utility model relates to the field of blasting, in particular to a hole plugging device suitable for gas rock breaking in a sandstone stratum subway foundation pit. Background Art

[0002] A high-pressure gas expansion rock breaking method based on the rapid combustion of a gas generating agent to generate a large amount of high-temperature and high-pressure gas that expands and cracks hard rocks has been recently invented. After preliminary actual engineering rock breaking tests, the high-pressure gas expansion rock breaking technology has the advantages of small rock breaking vibration, high safety and reliability of rock breaking equipment, and relatively high rock breaking efficiency. It is proved that the high-pressure gas expansion rock breaking technology and equipment are suitable for hard rock excavation projects near protected structures, such as urban underground tunnels, foundation pits, and rock breaking projects in protected areas such as ancient buildings near scenic spots.

[0003] However, since this technology requires filling and plugging of the fracture holes, the filling and plugging quality requirements are high. If the plugging quality does not meet the strength requirements, it will also cause a "punching hole" phenomenon, resulting in failure of rock breaking of the fracture hole. In order to reduce the probability of rock breaking failure, in the existing technology, high-strength, fast-setting special materials are often used for plugging. This kind of characteristic material uses a lot of materials, is expensive, and cannot be reused, which increases the cost of rock breaking.

[0004] To this end, the present application provides a hole plugging device for plugging the fissure-causing holes. While ensuring that there is sufficient pressure to fracture the rock body, the hole plugging device can be reused to reduce the cost of rock breaking. Utility Model Content

[0005] The utility model provides a hole plugging device suitable for gas rock breaking in a sandstone stratum subway foundation pit, and its purpose is to provide a hole plugging device to reduce the cost of rock breaking.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a plugging device suitable for gas rock breaking in sandstone formation subway foundation pit, comprising:

[0007] A hole plugging column, comprising a threaded rod body, a protrusion is arranged on the threaded rod body, a plurality of tooth wings are arranged at the bottom of the threaded rod body, the plurality of tooth wings are arranged in a ring array around the axial direction of the threaded rod body, and the tooth wings are used to overlap the hole wall;

[0008] The column cap comprises a sleeve for being screwed on the screw rod body, and a cover body for covering the protruding part is arranged at the bottom of the sleeve.

[0009] Preferably, the feature is that: the raised portion is a hemispherical body, the cover body is a hemispherical shell, and the raised portion protrudes upward.

[0010] Preferably, a rubber pad is provided on the edge of the cover body, and the rubber pad is sandwiched between the raised portion and the cover body.

[0011] Preferably, the threaded rod body is provided with an air filling tube opened along the axial direction of the threaded rod body, and the air filling tube is used to fill gas into the crack-causing hole.

[0012] Preferably, a bottom plate is provided at the bottom of the threaded rod body, the raised portion is higher than the bottom plate, a plurality of hinge seats are provided on the bottom plate, the plurality of hinge seats are arranged in a circular array around the axial direction of the threaded rod body, the tooth wing is rotatably provided on the hinge seat, and the tooth wing rotates toward the top end or the bottom end of the threaded rod body with the hinge seat as the axis.

[0013] Preferably, the hinge seat is provided with a bolt, and the bolt passes through the tooth wing and the hinge seat.

[0014] Preferably, a handle for driving the sleeve to rotate is provided at the top end of the sleeve.

[0015] The above solution of the utility model has the following beneficial effects:

[0016] In the present application, the hole-blocking column is inserted into the fissure hole, the free end of the tooth wing overlaps the hole wall, and then the column cap is screwed onto the hole-blocking column. The diameter of the cover on the nut needs to be the same as the diameter of the fissure hole. As the cover moves downward, it contacts the protrusion to complete the assembly. During the blasting, the gas instantly expands from the fissure hole to form high-pressure gas. The high-pressure gas pushes the hole-blocking device to move away from the blasting point. At this time, the tooth wing is inserted into the hole wall under the action of the impact force, providing a first force for fixing the hole-blocking column. At the same time, the fissure hole is also blocked by the protrusion and the cover. During the blasting process, friction is generated between the protrusion, the cover and the hole wall, providing a second force for fixing the hole-blocking column to prevent the hole-blocking column from rushing out of the fissure hole.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the use of the utility model;

[0019] Figure 2 It is a schematic diagram of the hole-blocking column;

[0020] Figure 3 It is a cross-sectional view of the column cap;

[0021] Figure 4 is a schematic diagram of a tooth wing.

[0022] [Description of Reference Numerals]

[0023] 100-hole plugging column, 110-threaded rod, 130-protrusion, 150-tooth wing, 170-inflatable tube, 190-bottom plate, 191-hinged seat,

[0024] 200-column cap, 210-sleeve, 230-cover, 250-rubber pad, 270-handle.

[0025] A-pore wall, B-expansion agent. DETAILED DESCRIPTION

[0026] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1-4 As shown, an embodiment of the utility model provides a hole plugging device suitable for gas rock breaking in a subway foundation pit in a sandstone stratum, comprising a hole plugging column 100 and a column cap 200 arranged on the hole plugging column 100, wherein the hole plugging column 100 comprises a threaded rod body 110, the outer surface of the threaded rod body 110 has an external thread, a protrusion 130 is arranged on the threaded rod body 110, and the protrusion 130 is used to plug the crack hole, and a plurality of tooth wings 150 are arranged at the bottom end of the threaded rod body 110, and the plurality of tooth wings 150 are arranged in a ring array around the axial direction of the threaded rod body 110, and the tooth wings 150 are used to overlap on the hole wall A and be inserted into the hole wall A when the threaded rod body 110 moves upward. The aforementioned column cap 200 includes a sleeve 210 , the inner wall of the sleeve 210 is provided with an internal thread matching the external thread, the sleeve 210 is threadedly connected to the threaded rod body 110 , and a cover body 230 is provided at the bottom of the sleeve 210 , and the cover body 230 is used to cover the raised portion 130 .

[0028] At the moment of explosion, the explosion point is located below the tooth wing 150, and a large amount of gas is generated at the explosion point. The volume of the gas expands rapidly, pushing the hole plugging device upward. At this time, the threaded rod body 110 moves upward under the impact of the high-pressure gas, causing the tooth wing 150 to rotate and penetrate into the hole wall A, providing a first force for fixing the hole plugging column 100. At the same time, the high-pressure gas also generates an upward force on the protrusion 130 and the cover body 230. Since the protrusion 130 and the cover body 230 block the crack hole, friction is generated between the cover body 230 and the hole wall A, providing a second force for fixing the hole plugging column 100. Under the joint action of the first force and the second force, the crack hole can be blocked, preventing the hole plugging column 100 from rushing out of the crack hole. After the explosion, cracks and collapse will occur on the inner wall of the crack hole, and the hole plugging device can be taken out and reused.

[0029] In addition, most of the structures of the present application can be made of steel, which is relatively low in cost.

[0030] Further, the protrusion 130 is a hemispherical body, the cover body 230 is a hemispherical shell, and the protrusion surface of the protrusion 130 is arranged upward, so that the protrusion 130 protrudes upward. Preferably, the inner surface of the shell is in surface contact with the protrusion 130.

[0031] In this embodiment, the outer surface of the cover body 230 contacts the hole wall A to generate friction, and the cover body 230 is covered on the raised portion 130. At the moment of explosion, most of the impact force is borne by the raised portion 130, and a small part of the impact force is borne by the cover body 230. At the same time, the raised portion 130 is hemispherical, and the impact force is transmitted to the cover body 230 after being evenly dispersed through the spherical surface, thereby reducing local stress concentration and avoiding deformation and damage of the cover body 230.

[0032] Preferably, in order to ensure that the cover body 230 fits closely with the hole wall A and reduce air leakage, a rubber pad 250 is provided at the edge of the cover body 230, and the rubber pad 250 is sandwiched between the raised portion 130 and the cover body 230. The rubber pad 250 has a certain flexibility, which can ensure that the cover body 230 fits closely with the hole wall A and does not interfere with the downward movement of the cover body 230.

[0033] Furthermore, an air filling tube 170 is provided on the threaded rod body 110. The air filling tube 170 is opened along the axial direction of the threaded rod body 110 and penetrates the threaded rod body 110. The air filling tube 170 is used to fill gas into the crack hole and inflate it in advance before blasting to form a high-pressure environment, thereby achieving a better blasting effect.

[0034] Furthermore, in order to better install the toothed wing 150 and ensure the connection strength of the toothed wing 150, a bottom plate 190 is provided at the bottom of the threaded rod body 110, the threaded rod body 110 is arranged perpendicular to the bottom plate 190, and the protrusion 130 is located above the bottom plate 190. A plurality of hinge seats 191 are provided on the bottom plate 190, and the plurality of hinge seats 191 are arranged in a ring array around the axial direction of the threaded rod body 110, the toothed wing 150 is rotatably provided at the upper left of the hinge, and the toothed wing 150 is divided into a free end and a hinge end, the hinge end is connected to the hinge seat 191, and the free end rotates with the hinge seat 191 as the axial direction to the top end or the bottom end of the threaded rod body 110.

[0035] Preferably, bolts are provided on the articulated seat 191 , and the bolts penetrate the toothed wing 150 and the articulated seat 191 , so as to achieve the effect of connecting the toothed wing 150 and the articulated seat 191 and facilitate the replacement of the toothed wing 150 .

[0036] Preferably, a handle 270 is provided at the top end of the sleeve 210 , and the handle 270 is used to drive the sleeve 210 to rotate.

[0037] When using this application, the following steps are included:

[0038] S10. An expansion tube is arranged at the bottom of the crack hole. The expansion tube is filled with an expansion agent B. The expansion agent B can instantly explode to generate expansion gas.

[0039] S20. Determine the outer diameter of the shell based on the diameter of the fissure hole, the outer diameter of the shell is equal to the diameter of the fissure hole;

[0040] The diameter of the protrusion 130 is determined based on the outer diameter of the shell, and the diameter of the protrusion 130 is smaller than the inner diameter of the shell; preferably, the diameter of the protrusion 130 is determined based on the inner diameter of the shell, and the inner diameter of the shell is the same as the diameter of the protrusion.

[0041] The length of the tooth wing 150 is determined based on the diameter of the fissure hole. When determining the length of the tooth wing 150, the tooth wing 150 is placed in a horizontal state, and the distance between the free ends of two tooth wings 150 located on the same diameter in this state is measured. The distance is greater than the diameter of the fissure hole, and the tooth wing 150 with the same length is installed on the hinge seat 191.

[0042] S30. Insert the hole plugging column 100 into the fissure hole. When the hole plugging column 100 is inserted downward into the fissure hole, the free end of the tooth wing 150 rotates upward under the action of the hole wall A. When the hole plugging column 100 is inserted, the free end of the tooth wing 150 is higher than the hinged end, and the free end overlaps the hole wall A.

[0043] S40. Screw the column cap 200 onto the threaded rod 110 from above the hole-blocking column 100 to ensure that the shell is fully fitted with the hole wall A to ensure air tightness. Preferably, the shell penetrates a certain distance into the crack-causing hole.

[0044] Preferably, before the column cap 200 is screwed onto the threaded rod body 110 , a rubber pad 250 is arranged on the edge of the cover body 230 to enhance the air tightness between the cover body 230 and the hole wall A.

[0045] S50. Detonate expansion agent B to complete blasting.

[0046] Preferably, before detonating the expansion agent B, gas is filled into the hole through the inflation tube 170 to form a high-pressure environment to improve the blasting effect.

[0047] S60. Take out the blocking device.

[0048] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A plugging device suitable for gas rock breaking in sandstone strata subway foundation pit, characterized in that: include: A hole-blocking column (100) comprises a threaded rod body (110), the threaded rod body (110) being provided with a protrusion (130), the bottom of the threaded rod body (110) being provided with a plurality of tooth wings (150), the plurality of tooth wings (150) being arranged in a ring array around the axial direction of the threaded rod body (110), the tooth wings (150) being used to overlap the hole wall (A); The column cap (200) comprises a sleeve (210) for being threadedly connected to a screw rod body, and a cover body (230) for covering the protrusion (130) is arranged at the bottom of the sleeve (210).

2. The hole plugging device suitable for gas rock breaking in sandstone strata subway foundation pit according to claim 1 is characterized by: The raised portion (130) is a hemispherical body, the cover body (230) is a hemispherical shell, and the raised portion (130) is raised upward.

3. The hole plugging device suitable for gas rock breaking in sandstone strata subway foundation pit according to claim 1 or 2, characterized in that: A rubber pad (250) is provided on the edge of the cover body (230), and the rubber pad (250) is sandwiched between the raised portion (130) and the cover body (230).

4. The hole plugging device suitable for gas rock breaking in sandstone strata subway foundation pit according to claim 1 is characterized by: The threaded rod body (110) is provided with an air filling tube (170) opened along the axial direction of the threaded rod body (110), and the air filling tube (170) is used to fill gas into the crack-causing hole.

5. The hole plugging device suitable for gas rock breaking in sandstone strata subway foundation pit according to claim 1 is characterized by: A bottom plate (190) is provided at the bottom of the threaded rod body (110), the raised portion (130) is higher than the bottom plate (190), a plurality of hinge seats (191) are provided on the bottom plate (190), the plurality of hinge seats (191) are arranged in a ring array around the axial direction of the threaded rod body (110), the toothed wing (150) is rotatably provided on the hinge seat (191), and the toothed wing (150) rotates toward the top end or the bottom end of the threaded rod body (110) with the hinge seat (191) as an axis.

6. The hole plugging device suitable for gas rock breaking in sandstone strata subway foundation pit according to claim 5 is characterized by: The hinge seat (191) is provided with a bolt, and the bolt passes through the tooth wing (150) and the hinge seat (191).

7. The hole plugging device suitable for gas rock breaking in sandstone strata subway foundation pit according to claim 1 is characterized by: A handle (270) for driving the sleeve (210) to rotate is provided at the top end of the sleeve (210).

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