Pressure relief support for gob-side lane retaining in coal mines and its construction method

Abstract

The present invention relates to the technical field of gob-side lane retaining support, and provides a coal mine gob-side lane retaining pressure-yielding support and a construction method thereof. The pressure-yielding support comprises an external rigid constraint body, which is hollow inside and has an opening at the top; an internal flexible mold, which is arranged on the inner peripheral side of the external rigid constraint body, and a grouting port is reserved at the top of the internal flexible mold; an internal filling body, which is filled into the inner side of the internal flexible mold from the grouting port; and a pressure-yielding layer, which is annularly arranged between the external rigid constraint body and the internal flexible mold, and the pressure-yielding layer is arranged at one end close to the grouting port. The coal mine gob-side lane retaining pressure-yielding support and a construction method thereof provided by the present invention enable the support to have good pressure-yielding performance. After the roof pressure is transmitted to the support, the unsolidified concrete undergoes plastic deformation, and the pressure-yielding layer is squeezed to both sides in the internal flexible mold. The pressure-yielding layer not only provides a deformable space, but also promotes the roof pressure to be evenly transmitted to the external rigid constraint body, thereby preventing the external rigid constraint body from being locally damaged.

Description

Technical Field

[0001] The invention relates to the technical field of gob-side tunnel retaining support, and in particular to a coal mine gob-side tunnel retaining pressure relief support and a construction method thereof. Background Art

[0002] Support pillars are a kind of supporting structure used in underground engineering and some geotechnical engineering. The main function of support pillars is to prevent the deformation and collapse of surrounding rock and soil or roof structures, and to provide stable support for underground space. At present, support pillars have been widely used in empty tunnel management and empty tunnel retention projects. With its significant technical and economic advantages, they have broad development prospects in major domestic mining areas.

[0003] In order to ensure the pillar forming effect and overall strength, the pillars in the prior art generally use rigid external constraints such as iron barrels and corrugated pipes as external templates. Such external templates can improve the pillar forming effect and improve the pillar stress conditions.

[0004] However, in the prior art, in the application of goaf-side tunnel retaining technology, concrete is used as the internal filling body, and it takes more than 28 days from the completion of pumping to reaching the final strength. During this period, due to the influence of the supporting pressure behind the working face, the top plate pressure will be transmitted to the pillars that have not reached the final strength, causing the incompletely solidified concrete to be compressed downward, and inside the pillar it will expand to both sides, thereby causing the external rigid constraint body (especially the top of the constraint body) to be damaged, seriously affecting the pillar forming effect, and after the external constraint is destroyed, the integrity of the pillar is destroyed, and the final overall strength is greatly reduced, which directly affects the safety of tunnel retention.

[0005] Therefore, how to provide a coal mine goaf-retaining lane pressure relief support and a construction method thereof to ensure the forming effect and final strength of the lane-side support support and improve the safety of the lane-retaining operation. Summary of the invention

[0006] The present invention provides a pressure-yielding support for a goaf-retaining lane in a coal mine, which is used to solve the defect in the prior art that the support is easy to expand to both sides, causing damage to the external rigid constraint body, thereby ensuring the forming effect and final strength of the support and improving the safety of the goaf-retaining lane operation.

[0007] The present invention provides a pressure relief support for a goaf-side lane retaining in a coal mine, comprising: An external rigid constraint body, hollow inside, and open at the top; An internal flexible mold is arranged on the inner circumference of the external rigid constraint body, and a grouting port is reserved at the top of the internal flexible mold; An internal filling body is filled into the inner side of the internal flexible mold from the grouting port; The pressure-releasing layer is annularly arranged between the external rigid constraint body and the internal flexible mold, and the pressure-releasing layer is arranged close to one end of the grouting port.

[0008] According to a coal mine gob-side lane retaining pressure-relief support provided by the present invention, the height of the pressure-relief layer is one third to two thirds of the height of the internal flexible mold.

[0009] A coal mine gob-side lane retaining pressure relief support provided by the present invention also includes a temporary reinforcement device, which is arranged on the outside of the external rigid constraint body and close to the top of the external rigid constraint body.

[0010] According to a coal mine gob-side lane retaining pressure relief support provided by the present invention, the internal filling body is a concrete material.

[0011] According to a coal mine gob-side lane retaining pressure relief support provided by the present invention, the internal flexible mold is a fiber flexible mold cloth material mold.

[0012] According to a coal mine gob-side lane retaining pressure relief support provided by the present invention, the pressure relief layer is a chloroprene rubber foam material with a thickness of 30-80 mm.

[0013] According to a coal mine gob-side lane retaining pressure relief support provided by the present invention, the temporary reinforcement device is an annular clamp; and the external rigid constraint body is an iron sleeve.

[0014] According to a coal mine gob-side lane retaining pressure relief support provided by the present invention, the internal flexible mold is cylindrical after being fully extended.

[0015] The present invention also provides a method for constructing a coal mine rock hole lane retaining pressure relief support, comprising: Assemble the internal flexible mold, the pressure layer, and the external rigid constraint body to form a combined mold; Transport the combined mold to the designated work site; Pumping the internal filling body through the grouting port reserved on the top side of the internal flexible mold until the combined mold is filled; A temporary reinforcement device is installed on the top of the combined mold.

[0016] According to the construction method of the pressure relief support for gob-side lane retaining in coal mines provided by the present invention, after a temporary reinforcement device is installed on the top of the combined mold, the method further comprises: After the pillar reaches a certain strength, the temporary reinforcement device is removed.

[0017] The coal mine goaf-retaining tunnel pressure-yielding pillar provided by the present invention has an external rigid constraint body that is hollow inside and open at the top, an internal flexible mold is arranged on the inner circumference of the external rigid constraint body, and a grouting port is reserved at the top of the internal flexible mold, and an internal filling body is filled into the inner side of the internal flexible mold from the grouting port; a pressure-yielding layer is annularly arranged between the external rigid constraint body and the internal flexible mold, and the pressure-yielding layer is arranged at one end close to the grouting port, so that the pillar has good pressure-yielding property, after the roof pressure is transmitted to the pillar, the concrete that has not been completely solidified undergoes plastic deformation, and the pressure-yielding layer is squeezed toward both sides in the internal flexible mold, and the pressure-yielding layer provides a deformable space on the one hand, and can promote the roof pressure to be evenly transmitted to the external rigid constraint body on the other hand, thereby preventing local damage to the external rigid constraint body.

[0018] The construction method of the pressure-relief pillar for leaving lanes along the goaf in a coal mine provided by the present invention comprises the following steps: assembling an internal flexible mold, a pressure-relief layer, and an external rigid constraint body to form a combined mold; transporting the combined mold to a designated work site; pumping an internal filling body through a grouting port reserved on the top side of the internal flexible mold until the combined mold is filled; and installing a temporary reinforcement device on the top of the combined mold. The pillar constructed by this construction method has reliable strength, and the pressure-relief layer and the temporary reinforcement device ensure the structural stability of the pillar, especially the top of the pillar, thereby ensuring that no local damage occurs before the pillar reaches the final strength, greatly improving the pillar molding effect and overall strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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 It is a cross-sectional view of the pressure relief support for gob-side lane retention in a coal mine provided by the present invention.

[0021] Figure 2 The invention is a top view of the pressure relief support for the goaf-retaining lane in a coal mine provided by the present invention.

[0022] Reference numerals: 1. External rigid constraint body; 2. Internal flexible mold; 3. Grouting port; 4. Internal filling body; 5. Pressure relief layer; 6. Temporary reinforcement device. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] Combine the following Figure 1-Figure 2 The coal mine goaf-side lane retaining pressure relief support provided by the present invention comprises an external rigid constraint body 1, an internal flexible mold 2, an internal filling body 4 and a pressure relief layer 5.

[0026] like Figure 1 and Figure 2 As shown, the external rigid constraint body 1 is hollow inside and open at the top, which plays the role of overall external support and constraint. The internal flexible mold 2 is arranged on the inner circumference of the external rigid constraint body 1. The material is soft and has a certain elasticity. A grouting port 3 is reserved at the top of the internal flexible mold 2 to facilitate the subsequent injection operation of the internal filling body 4. The internal filling body 4 is filled into the inner side of the internal flexible mold 2 from the grouting port 3, and is usually made of materials such as concrete. Let the pressure layer 5 be arranged in an annular shape between the external rigid constraint body 1 and the internal flexible mold 2, and let the pressure layer 5 be arranged at one end close to the grouting port 3. Let the pressure layer 5 have good deformation ability, such as rubber, foam, etc. Let the pressure layer 5 be able to deform under the action of the top plate pressure, provide additional deformation space for the internal filling body 4, and promote the top plate pressure to be evenly transmitted to the external rigid constraint body 1.

[0027] The coal mine goaf-retaining tunnel pressure-yielding support provided by the present invention has good pressure-yielding properties. When the roof pressure is transmitted to the support, the incompletely solidified concrete undergoes plastic deformation. Due to the restraining effect of the internal flexible mold 2, the internal filling body 4 squeezes the pressure-yielding layer 5 on both sides within the internal flexible mold 2. The pressure-yielding layer 5 provides a deformable space on the one hand, and on the other hand can promote the roof pressure to be evenly transmitted to the external rigid constraint body 1, thereby preventing local damage to the external rigid constraint body 1.

[0028] In the above embodiment, the plastic deformation and pressure-releasing effect of the pillar under the top plate pressure are achieved through the joint action of the internal flexible mold 2, the internal filling body 4 and the pressure-releasing layer 5. The setting of the pressure-releasing layer 5 enables the top plate pressure to be more evenly transmitted to the external rigid constraint body 1, avoiding the occurrence of local damage. In addition, by adjusting the materials and parameters of the internal filling body 4, the pressure-releasing layer 5 and other components, adaptation and matching to different top plate pressure conditions can be achieved.

[0029] In a feasible embodiment of the present invention, the laminated layer 5 is a chloroprene rubber foam material, and the height of the laminated layer 5 is one third to two thirds of the height of the internal flexible mold 2. The laminated layer 5 has the characteristics of fireproof, deformable, slightly elastic, and the elasticity increases with the increase of deformation degree.

[0030] In the above embodiments, the chloroprene rubber foam material has good flame retardancy, can resist the spread of fire to a certain extent, and ensure the safety of the support structure in the event of a fire. The chloroprene rubber foam material has good compressibility and recovery, can be deformed under the pressure of the top plate, and recover to a certain extent after the pressure is released, thereby effectively absorbing and dispersing the pressure. The material has a certain initial elasticity and can provide a certain support effect when subjected to a small pressure. At the same time, as the degree of deformation increases, its elasticity will gradually increase, so that the pillar can better adapt to the top plate pressure of different sizes.

[0031] In addition, the height of the pressure layer 5 is one-third to two-thirds of the height of the internal flexible mold 2. Through the appropriate height range, sufficient buffering and protection space is ensured, and the stability of the entire mold will not be affected or too much unnecessary space will not be occupied due to the pressure layer 5 being too thick.

[0032] Specifically, when the top plate pressure acts on the pillar, the pressure layer 5 deforms first, absorbing and dispersing part of the pressure. As the pressure increases, the internal flexible mold 2 and the internal filling body 4 also begin to deform, further absorbing and dispersing the pressure. Since the height of the pressure layer 5 is moderate, it can ensure deformation space while limiting excessive deformation, thereby ensuring the overall stability and safety of the support structure.

[0033] In a feasible embodiment of the present invention, it also includes a temporary reinforcement device 6, which is arranged on the outside of the external rigid constraint body 1 and close to the top of the external rigid constraint body 1. The setting of the temporary reinforcement device 6 can increase the top confining pressure before the pillar is formed to prevent the top structure of the pillar from being damaged. After the pillar reaches a certain strength, it can be disassembled and reused.

[0034] Before the pillar is formed, the top structure is relatively fragile, and the temporary reinforcement device 6 can effectively increase the confining pressure on the top. This plays a key role in preventing the top structure from being damaged by factors such as lateral pressure during concrete pouring, ensuring that the pillar can maintain a stable shape and structural integrity in the early stage of forming, reducing quality defects or safety hazards caused by early structural damage, and improving the quality of pillar forming.

[0035] Among them, the temporary reinforcement device 6 provides additional confining pressure support for the top of the pillar through its own rigidity and stability. This helps to prevent deformation and damage to the top structure in the early stage of pillar forming, especially when the internal filling body 4 is insufficient in strength. During coal mining, roof pressure and other external forces may have an adverse effect on the pillar structure. The setting of the temporary reinforcement device 6 can effectively reduce the impact of these external forces on the top structure of the pillar, prevent structural damage, and ensure the overall stability and safety of the support system.

[0036] In a feasible embodiment of the present invention, the internal filling body 4 is a concrete material, wherein the concrete grade is determined according to the on-site lane retention requirements. The concrete grade usually refers to the compressive strength grade of concrete, which is an important indicator for measuring the quality of concrete. Different engineering application scenarios have different strength requirements for concrete. Therefore, in this embodiment of the present invention, by selecting a suitable concrete grade according to the specific lane retention requirements, it can be ensured that the internal filling body 4 can not only meet the structural strength requirements, but also can economically and rationally utilize material resources.

[0037] In a feasible embodiment of the present invention, the internal flexible mold 2 is a fiber flexible mold cloth material mold. The fiber mold cloth material has good elasticity, ductility and sealing properties. The mold is cylindrical after being fully extended, and a grouting port is arranged on the top for pouring the internal filling body 4.

[0038] In a feasible embodiment of the present invention, the thickness of the pressure layer 5 is 30-80 mm, which can provide a certain deformable space, so that the pressure layer 5 can be deformed to a certain extent under the pressure of the top plate, thereby absorbing and dispersing part of the pressure, which helps to alleviate the direct impact of the top plate on the external rigid constraint body 1 and improve the stability and safety of the entire structure. It can also promote the uniform transmission of the top plate pressure to the external rigid constraint body 1, prevent the external rigid constraint body 1 from being damaged, extend the service life of the external rigid constraint body 1, and improve the bearing capacity of the entire structure.

[0039] In a feasible embodiment of the present invention, the temporary reinforcement device 6 is an annular clamp; the annular clamp has the characteristics of easy installation and quick disassembly. The annular clamp can fit tightly to the reinforced structure and provide additional support and stability to the structure through its own rigidity and tightening force.

[0040] The external rigid constraint 1 is an iron sleeve, which can provide a certain rigidity to prevent the pillar from deforming, and also has good corrosion resistance and durability, which helps to extend the service life of the structure and reduce maintenance costs. At the same time, the cylindrical structure of the iron sleeve can also better disperse the pressure and reduce the risk of local damage.

[0041] In a feasible embodiment of the present invention, the internal flexible mold 2 is cylindrical after being fully extended, which is compatible with the external rigid constraint body 1, thereby improving the overall coordination and stability of the structure.

[0042] Therefore, the pressure-yielding pillars for leaving lanes along the coal mine provided by the present invention have good pressure-yielding properties. After the roof pressure is transmitted to the pillars, the unsolidified concrete undergoes plastic deformation, squeezing the pressure-yielding layer 5 to both sides in the formwork. The pressure-yielding layer 5 provides a deformable space on the one hand, and on the other hand can promote the uniform transmission of the roof pressure to the external constraining body, thereby preventing local damage to the external constraining body.

[0043] The pillar has reliable strength, and the pressure layer 5 and the temporary reinforcement device 6 ensure the structural stability of the pillar, especially the top of the pillar, so as to ensure that no local damage occurs before the pillar reaches the final strength, which greatly improves the pillar forming effect and overall strength.

[0044] The second embodiment of the present invention provides a method for constructing a pressure relief support for a goaf-retained lane in a coal mine, comprising: S1, assemble the internal flexible mold 2, the pressing layer 5, and the external rigid constraint body 1 to form a combined mold.

[0045] In the above steps, ensure that the components are tightly connected to avoid leakage or deformation in the subsequent steps. Preferably, the yield layer 5 is distributed as evenly as possible between the external rigid constraint body 1 and the internal flexible mold 2 to ensure a good yield effect.

[0046] S2. Transport the combined mold to the designated work site.

[0047] In the above steps, necessary protective measures should be taken to prevent the combined mold from being damaged or deformed, and the combined mold should be transported to the work site as a whole to improve construction efficiency.

[0048] S3. Pump the internal filling body 4 through the grouting port 3 reserved on the top side of the internal flexible mold 2 until the combined mold is filled.

[0049] In the above steps, the internal filling body 4 is injected into the combined mold through the grouting port 3 reserved on the top side of the internal flexible mold 2 using a pumping device until the entire mold is filled.

[0050] S4. Install a temporary reinforcement device 6 on the top of the combined mold.

[0051] In the above steps, a temporary reinforcement device is installed on the top of the combined mold to increase the top confining pressure before the pillar is formed to prevent structural damage.

[0052] The construction method of the pressure-relief support for coal mine goaf-retaining lanes provided by the present invention has a simple construction process. The internal flexible mold 2, the pressure-relief layer 5 and the external rigid constraint body 1 can all be assembled on the ground and then transported underground. It only requires pumping the internal filling body 4 and installing a temporary reinforcement device 6. It has the advantages of high efficiency, safety, repeatability and adaptability, and can ensure the correct installation and efficient use of the support system, providing favorable support guarantees for coal mining.

[0053] In a feasible embodiment of the present invention, after the temporary reinforcement device 6 is installed on the top of the combined mold, the method further includes: S5, after the pillar reaches a certain strength, removing the temporary reinforcement device 6.

[0054] The coal mine goaf-retaining lane yielding support and construction method provided by the present invention meet the actual needs on site, solve the problems of local easy damage, poor forming effect, low final strength, etc. of the previous goaf-retaining lane yielding support, and greatly improve the applicability and safety of the support lane retaining technology.

[0055] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure relief support for gob-side lane retention in coal mines, characterized in that: include: An external rigid restraining body (1) is hollow inside and has an opening at the top; An internal flexible mold (2) is arranged on the inner peripheral side of the external rigid constraint body (1), and a grouting port (3) is left at the top of the internal flexible mold (2); An internal filling body (4) is filled into the inner side of the internal flexible mold (2) from the grouting port (3); The pressure-releasing layer (5) is annularly arranged between the external rigid constraint body (1) and the internal flexible mold (2), and the pressure-releasing layer (5) is arranged close to one end of the grouting port (3).

2. The pressure relief support for gob-side entry retaining in coal mines according to claim 1 is characterized in that: The height of the yield layer (5) is one third to two thirds of the height of the internal flexible mold (2).

3. The pressure relief support for gob-side entry retaining in coal mines according to claim 1, characterized in that: It also includes a temporary reinforcement device (6), which is arranged on the outside of the external rigid constraint body (1) and close to the top of the external rigid constraint body (1).

4. The pressure relief support for gob-side entry retaining in coal mines according to any one of claims 1 to 3, characterized in that: The internal filling body (4) is made of concrete material.

5. The pressure relief support for gob-side entry retaining in coal mines according to claim 4 is characterized in that: The internal flexible mould (2) is a mould made of a flexible fibre mould cloth material.

6. The pressure relief support for gob-side entry retaining in coal mines according to claim 4, characterized in that: The yield layer (5) is made of chloroprene rubber foam material and has a thickness of 30-80 mm.

7. The pressure relief support for gob-side entry retaining in coal mines according to claim 3, characterized in that: The temporary reinforcement device (6) is an annular clamp; and the external rigid constraint body (1) is an iron sleeve.

8. The pressure relief support for gob-side entry retaining in coal mines according to claim 3, characterized in that: The internal flexible mold (2) is cylindrical when fully extended.

9. A method for constructing pressure relief pillars in gob-side lane retaining in coal mines, characterized in that: include: Assembling the internal flexible mold (2), the pressure layer (5), and the external rigid constraint body (1) to form a combined mold; Transport the combined mold to the designated work site; Pumping the internal filling body (4) through the grouting port (3) reserved on the top side of the internal flexible mold (2) until the combined mold is filled; A temporary reinforcement device (6) is installed on the top of the combined mold.

10. A method for constructing pressure relief pillars for gob-side entry retaining in coal mines according to claim 9, characterized in that: After the temporary reinforcement device (6) is installed on the top of the combined mold, the method further comprises: After the pillar reaches a certain strength, the temporary reinforcement device (6) is removed.

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