Mine tunnel assembled pipe shed steel frame

Abstract

The utility model belongs to the technical field of pipe shed steel frame, concretely relates to a mine laneway fabricated pipe shed steel frame, including steel pipe and grouting expansion assembly, is equipped with overflow booster hole on the side of steel pipe located in one side of steel pipe grouting hole, grouting expansion assembly is sleeved on the steel pipe outside overflow booster hole, grouting expansion assembly is composed of rubber expansion ring, fixed ring, temperature sensing lock ring, both ends of rubber expansion ring are clamped in the inside of fixed ring, and one end of temperature sensing lock ring is clamped and connected between the outside surface of rubber expansion ring and fixed ring, the other end of temperature sensing lock ring is formed with deformation compression section. Grouting expansion assembly is added to the outer wall of steel pipe, realizes slurry pressure trigger type plugging, with the two-stage sealing mechanism of slurry pressure expansion and temperature control locking, solves the problem that slurry flows back and seeps from the gap between pipe wall and aperture.

Description

Technical Field

[0001] This utility model belongs to the technical field of pipe roof steel frame, specifically relating to a prefabricated pipe roof steel frame for mine roadways. Background Technology

[0002] The principle of pipe roof steel frame is to set a series of steel pipes outside the roadway excavation outline and inject grout into the steel pipes and the surrounding strata to form a roof-like support structure with a certain strength and rigidity, so as to support the surrounding rock in advance, limit the deformation of the surrounding rock, and ensure the safety and stability of the roadway excavation process.

[0003] However, existing pipe roof steel frame support technology has the following problems in practical application. First, grout leakage during the pipe roof grouting process seriously affects the support effect. In traditional pipe roof construction, there is a certain gap between the steel pipe and the borehole wall. During grouting, due to uneven grout pressure distribution or large pores in the borehole wall, the grout is very easy to backflow and seep out from the gap between the pipe wall and the pores, resulting in incomplete grouting and insufficient diffusion range, which cannot effectively reinforce the surrounding rock.

[0004] Secondly, the existing pipe roof sealing structure is poorly designed and cannot adapt to the complex and ever-changing downhole environment. Some pipe roofs use simple rubber rings or cotton yarn for sealing, and these materials are prone to aging and damage under high water pressure and high stress, resulting in a rapid decline in sealing performance. Utility Model Content

[0005] To address the above problems, the purpose of this utility model is to provide a prefabricated pipe roof steel frame for mine roadways, which solves the problem of grout leakage from the gap between the steel pipe wall and the borehole during grouting in the support of the pipe roof steel frame for mine roadways.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a prefabricated pipe roof steel frame for mine roadways, comprising steel pipes and grouting expansion components. An overflow pressure boosting hole is provided on the side of the steel pipe located on one side of the grouting hole. The grouting expansion components are fitted onto the steel pipe outside the overflow pressure boosting hole. The grouting expansion components consist of a rubber expansion ring, a fixing ring, and a temperature-sensitive locking ring. Both ends of the rubber expansion ring are clamped inside the fixing ring, and one end of the temperature-sensitive locking ring is clamped between the outer side of the rubber expansion ring and the fixing ring. The other end of the temperature-sensitive locking ring is formed with a deformable pressing section.

[0007] The beneficial effects of this utility model are as follows: by adding a grouting expansion component to the outer wall of the steel pipe, a grout pressure triggered sealing is achieved. The dual-stage sealing mechanism of grout pressure expansion plus temperature control locking solves the problem of grout backflow and seepage from the pipe wall and pores.

[0008] To ensure the rubber expansion ring smoothly follows the steel pipe into the borehole;

[0009] As a further improvement to the above technical solution: the rubber expansion ring is a wear-resistant neoprene rubber with a cylindrical structure, and when the inner cavity of the rubber expansion ring is under normal pressure, the outer diameter of the rubber expansion ring is 3-5 mm smaller than the diameter of the drill hole.

[0010] The beneficial effect of this improvement is that the outer diameter of the rubber expansion ring is smaller than the diameter of the borehole, so it can be inserted into the borehole more smoothly for sealing work.

[0011] In order to effectively improve the structural strength of rubber expansion rings;

[0012] As a further improvement to the above technical solution: the rubber expansion ring has an aramid fiber web inside, and the tensile strength of the aramid fiber web is not less than MPa.

[0013] The beneficial effects of this improvement are: the use of aramid fiber mesh can effectively improve the structural strength of aramid fiber mesh and avoid damage to the rubber expansion ring caused by excessive local pressure such as sand and gravel impact.

[0014] To facilitate the installation of grouting expansion components on steel pipes;

[0015] As a further improvement to the above technical solution: the fixing ring is slidably fitted on the outside of the steel pipe.

[0016] The beneficial effects of this improvement are: the copper retaining ring can be smoothly slid on the outside of the steel pipe for installation, and the heat of the concrete can be quickly transferred to the temperature-sensing locking ring.

[0017] To effectively ensure the connection strength of the rubber expansion ring, the retaining ring, and the temperature-sensitive locking ring;

[0018] As a further improvement to the above technical solution: a locking buckle is protruding on the inner wall where the fixing ring connects with the temperature-sensing locking ring, and a groove is formed on the temperature-sensing locking ring to fit and engage with the locking buckle.

[0019] The beneficial effects of this improvement are: the locking buckle can effectively improve the connection strength of the rubber expansion ring, the fixing ring, and the temperature-sensitive locking ring.

[0020] In order to effectively press the edge of the rubber expansion ring when heated, thus sealing the inner cavity of the rubber expansion ring;

[0021] As a further improvement to the above technical solution: the temperature-sensitive locking ring and the deformation clamping section are integrally formed shape memory alloys, and the Curie point is a temperature of 55-65℃, and the deformation clamping section is a corrugated pipe structure.

[0022] The beneficial effects of this improvement are as follows: During grouting, the temperature of the concrete entering the inner side of the rubber expansion ring through the overflow pressure hole exceeds the threshold under the action of cement hydration heat. The inner diameter of the deformation and pressing section decreases due to heat deformation, thereby pressing the edge of the rubber expansion ring, ensuring the sealing of the inner cavity of the rubber expansion ring, and ensuring the stability of the overall position of the grouting expansion assembly on the steel pipe.

[0023] To further ensure the shrinkage and deformation effect of the temperature-sensitive locking ring after heating;

[0024] As a further improvement to the above technical solution: the temperature-sensing locking ring and the deformation-pressing section have an expansion coefficient of 1.5 × 10⁻⁶. -5 Cu-Al-Ni alloys at / ℃.

[0025] The beneficial effects of this improvement are as follows: based on the common borehole diameter in roadways, when the temperature rises from 20℃ to 60℃, the radial expansion of the deformed and compacted section reaches exactly 4.5mm, which can effectively offset the borehole gap.

[0026] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the steel pipe structure in this utility model;

[0029] Figure 3 This is a cross-sectional view of the grouting expansion component in this utility model;

[0030] Figure 4 This is an enlarged view of A in this utility model;

[0031] In the diagram: 1. Steel pipe; 11. Overflow pressure boosting hole; 2. Grouting expansion assembly; 3. Rubber expansion ring; 31. Aramid fiber mesh; 4. Fixing ring; 41. Locking buckle; 5. Temperature-sensitive locking ring; 51. Deformation and pressing section. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0033] Example 1:

[0034] like Figure 1 — Figure 4As shown: A prefabricated pipe roof steel frame for mine roadways includes a steel pipe 1 and a grouting expansion assembly 2. An overflow pressure boosting hole 11 is opened on the side of the steel pipe 1 located on one side of the grouting hole. The grouting expansion assembly 2 is fitted onto the steel pipe 1 outside the overflow pressure boosting hole 11. The grouting expansion assembly 2 consists of a rubber expansion ring 3, a fixing ring 4, and a temperature-sensitive locking ring 5. The two ends of the rubber expansion ring 3 are clamped inside the fixing ring 4, and one end of the temperature-sensitive locking ring 5 is clamped and connected between the outer side of the rubber expansion ring 3 and the fixing ring 4. The other end of the temperature-sensitive locking ring 5 is formed with a deformable pressing section 51 on the outside of the steel pipe 1. A grouting expansion component 2 is installed on the wall to achieve grout pressure-triggered sealing. This dual-stage sealing mechanism, combining grout pressure expansion with temperature-controlled locking, solves the problem of grout backflow and seepage between the pipe wall and pores. The rubber expansion ring 3 is a cylindrical, wear-resistant neoprene rubber structure. When the inner cavity of the rubber expansion ring 3 is under normal pressure, its outer diameter is 3-5 mm smaller than the borehole diameter, allowing for smooth insertion into the borehole for sealing. The rubber expansion ring 3 contains an aramid fiber mesh 31 with a tensile strength of not less than 800 MPa. The use of aramid fiber mesh 31 can effectively improve the structural strength of aramid fiber mesh 31, avoiding damage to the rubber expansion ring 3 caused by excessive local pressure such as sand and gravel impact. The fixing ring 4 is slidably fitted on the outside of the steel pipe 1. The copper fixing ring 4 can be smoothly installed by sliding on the outside of the steel pipe 1, and can quickly transfer the heat of the concrete to the temperature-sensitive locking ring 5. The inner wall of the fixing ring 4 where it connects with the temperature-sensitive locking ring 5 has a protruding locking buckle 41. The temperature-sensitive locking ring 5 has a groove that fits and engages with the locking buckle 41. The setting of the locking buckle 41 can effectively improve the structural strength of the rubber expansion ring 3, fixing ring 4, and temperature-sensitive locking ring. The connection strength of the temperature-sensitive locking ring 5 and the deformation clamping section 51 is a one-piece molded shape memory alloy with a Curie point of 55-65℃. The deformation clamping section 51 has a corrugated pipe structure. During grouting, the temperature of the concrete grout entering the inner side of the rubber expansion ring 3 through the overflow pressure boosting hole 11 exceeds the threshold under the action of cement hydration heat. The inner diameter of the deformation clamping section 51 is reduced due to heat deformation, thereby clamping the edge of the rubber expansion ring 3, ensuring the sealing of the inner cavity of the rubber expansion ring 3, and ensuring the stability of the overall position of the grouting expansion assembly 2 on the steel pipe 1. The temperature-sensitive locking ring 5 and the deformation clamping section 51 have an expansion coefficient of 1.5×10. -5 Based on the common borehole diameter of Φ108mm steel pipe with a gap of 20mm, the radial expansion of the deformation and clamping section 51 reaches exactly 4.5mm when the temperature rises from 20℃ to 60℃, which can effectively offset the borehole gap.

[0035] The working principle of this technical solution is as follows: Using hoisting equipment, the steel pipe 1 with the grouting expansion component 2 installed is slowly placed into the borehole. Since the outer diameter of the rubber expansion ring 3 is 3-5mm smaller than the borehole diameter, it can be smoothly inserted. The grouting hole of the steel pipe 1 is connected to the grouting pump through a high-pressure grouting pipe. Cement grout is prepared according to the design mix ratio. When the grout enters the inner side of the rubber expansion ring 3 through the overflow pressure hole 11, the rubber expansion ring 3 expands outward under the grout pressure, filling the gap between the steel pipe and the borehole wall, initially providing a sealing effect. As grouting proceeds, the cement grout undergoes a hydration reaction, releasing heat. When the grout temperature rises to the Curie point of the temperature-sensitive locking ring 5 (55-65℃), the deformation and pressing section 51 of the temperature-sensitive locking ring 5 deforms due to heat, its inner diameter decreases, and it tightly presses the edge of the rubber expansion ring 3, further enhancing the sealing effect and ensuring that the grout does not backflow or seep out from between the pipe wall and the pore, while also ensuring the stability of the position of the grouting expansion component 2 on the steel pipe 1.

[0036] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A prefabricated steel frame for a mine roadway, characterized in that: The device includes a steel pipe (1) and a grouting expansion assembly (2). An overflow pressure boosting hole (11) is provided on the side of the steel pipe (1) located on the side of the grouting hole. The grouting expansion assembly (2) is fitted on the steel pipe (1) outside the overflow pressure boosting hole (11). The grouting expansion assembly (2) is composed of a rubber expansion ring (3), a fixing ring (4), and a temperature-sensitive locking ring (5). The two ends of the rubber expansion ring (3) are clamped on the inner side of the fixing ring (4), and one end of the temperature-sensitive locking ring (5) is clamped and connected between the outer side of the rubber expansion ring (3) and the fixing ring (4). The other end of the temperature-sensitive locking ring (5) is formed with a deformable pressing section (51).

2. The prefabricated pipe roof steel frame for mine roadways according to claim 1, characterized in that: The rubber expansion ring (3) is a wear-resistant neoprene rubber with a cylindrical structure. When the inner cavity of the rubber expansion ring (3) is under normal pressure, the outer diameter of the rubber expansion ring (3) is 3-5 mm smaller than the borehole diameter.

3. The prefabricated pipe roof steel frame for mine roadways according to claim 1, characterized in that: The rubber expansion ring (3) has an aramid fiber mesh (31) inside, and the fiber mesh breaking strength of the aramid fiber mesh (31) is not less than (800) MPa.

4. The prefabricated pipe roof steel frame for mine roadways according to claim 1, characterized in that: The fixing ring (4) is slidably fitted on the outside of the steel pipe (1).

5. The prefabricated pipe roof steel frame for mine roadways according to claim 1, characterized in that: A locking buckle (41) is protruding from the inner wall of the fixed ring (4) that connects with the temperature-sensitive locking ring (5), and a groove is formed on the temperature-sensitive locking ring (5) that is adapted to engage with the locking buckle (41).

6. The prefabricated pipe roof steel frame for mine roadways according to claim 1, characterized in that: The temperature-sensitive locking ring (5) and the deformation pressing section (51) are integrally formed shape memory alloys, and the Curie point is a temperature of 55-65℃. The deformation pressing section (51) is a corrugated pipe structure.

7. The prefabricated pipe roof steel frame for mine roadways according to claim 1, characterized in that: The temperature-sensitive locking ring (5) and the deformation-pressing section (51) have an expansion coefficient of 1.5 × 10⁻⁶. -5 Cu-Al-Ni alloys at / ℃.

Images