Efficient grouting hollow anchor cable steel strand

Abstract

The invention discloses an efficient grouting hollow anchor cable steel strand, relates to the technical field of anchor cables, and aims at solving the technical problem that an existing hollow anchor cable used for coal mine supporting is troublesome in machining process. A plurality of steel strands which are annularly arranged at equal intervals are wound on the outer surface of the hollow cavity core; the multiple steel strands are arranged in a spiral mode, and the multiple steel strands are connected with the hollow cavity core in a fastened mode through pipe hoops. A circulation channel used for grouting is arranged in the hollow cavity core. Compared with a conventional solid core wire which is replaced by a bendable hollow cavity core, continuous production of the grouting hollow anchor cable steel strand is achieved, and compared with the arrangement that the core wire needs to be pulled out to replace a straight steel pipe after winding preparation of the conventional solid core wire, the design of the grouting hollow anchor cable steel strand effectively improves the preparation operation efficiency in production and preparation, and the production cost is reduced. Preparation steps are reduced, and the efficient production effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of anchor cable technology, and more specifically, to a high-efficiency grouting hollow anchor cable strand. Background Technology

[0002] As coal mining depths increase, the complexity of roadway topography also changes, primarily manifested in severe rock fragmentation and stress concentration. This is particularly problematic in roadways with poor surrounding rock conditions, large-section chambers, intersections, near fault zones, and roadways affected by dynamic pressure. Grouting anchors can effectively suppress the formation of joints and fissures within the surrounding rock, and prevent further damage from the formation of concreted rock masses by the grouting fluid. By injecting grout that can effectively bind with the rock and soil into the pores and fissures of the rock and soil, the rock and soil become a new structure with high strength, good impermeability, and high stability, thereby improving the physical and mechanical properties of the rock and soil. This method plays a crucial role in the support of loose and fractured surrounding rock, extremely soft rock strata, high-stress fractured surrounding rock, and deep coal roadways. Grouting anchors involve installing the anchor cable body in the anchor hole and then injecting grout into the anchor hole under high pressure. The grout enters the surrounding rock fissures through the anchor hole, cementing the fractured surrounding rock into a whole. Grouting anchor cables serve a dual purpose: grouting and anchoring. Hollow grouting anchor cables consist of multiple steel strands spirally wound around a grouting core tube, through which high-pressure grout is injected into the anchor hole.

[0003] The hollow anchor cables currently used in coal mine support are generally made by cutting steel strands into fixed lengths, removing the core wires, and replacing them with straight steel pipes. The processing is quite complicated. Therefore, it is particularly important to propose a grouting hollow anchor cable steel strand that is easy to process and prepare efficiently. In view of this, we propose a high-efficiency grouting hollow anchor cable steel strand. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency grouting hollow anchor cable strand to solve the technical problem that the processing of existing hollow anchor cables used in coal mine support is relatively complicated.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-efficiency grouting hollow anchor cable steel strand, comprising a hollow core; a plurality of steel strands arranged in a ring at equal intervals are wound around the outer surface of the hollow core; the plurality of steel strands are arranged in a spiral, and the plurality of steel strands are fastened to the hollow core by pipe clamps; wherein, a flow channel for grouting is provided inside the hollow core; wherein, one end of the hollow core is sealed; and, the other end of the hollow core is connected by a hydraulic ring plug.

[0006] This invention replaces the conventional solid core wire with a flexible hollow core, enabling continuous production of grouting hollow anchor cable strands. Compared to conventional solid core wires, which require extraction and replacement with straight steel pipes after winding, this grouting hollow anchor cable strand design effectively improves the efficiency of the production process, reduces the number of steps, and achieves high-efficiency production.

[0007] Preferably, the outer surface of the hollow cavity core is provided with an arc-shaped outer corner to accommodate the steel strand; and a contact protrusion is provided on the side of the arc-shaped outer corner; the contact protrusion is located between two adjacent steel strands, wherein the contact protrusion is provided with a plurality of diversion slots in sequence; wherein the depth of the diversion slots intersects with the arc angle of the arc-shaped outer corner.

[0008] Preferably, the hollow cavity core is connected to the inner cavity wall core by a plurality of annularly spaced support blocks; wherein, the inner wall of the hollow cavity core forms a plurality of annularly spaced expansion cavities by the plurality of support blocks and the inner cavity wall core.

[0009] Preferably, the expansion cavities are interconnected; the connection points between the inner cavity wall core, the hollow cavity core, and the support block are all chamfered; and the wall thickness of the inner cavity wall core is greater than the wall thickness of the hollow cavity core.

[0010] Preferably, the inner and outer walls of the inner cavity wall core are provided with spiral corrugated grooves; wherein, the corrugated grooves located at one of the expansion chamber positions are provided with three undulating arc angles; wherein, the internal gap of the inner cavity wall core forms a grouting flow cavity with relatively many arc angles and small undulating drop of the troughs.

[0011] Preferably, the expansion chamber is pushed by a hydraulic ring plug to cause the outer edge of the expansion chamber to expand, which causes the steel strand to be squeezed against the arc-shaped outer corner, increasing the force on the steel strand and the anchor point, and forming a primary expansion tensioning structure.

[0012] Preferably, the expansion cavity is further squeezed and pushed by the hydraulic ring plug, causing the inner edge of the expansion cavity to expand. This causes the grouting flow cavity with many relative arc angles and small trough undulations to be squeezed and deformed into a grouting flow cavity with fewer relative arc angles and larger trough undulations, forming a reinforced grout solidification shear-resistant structure.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention replaces the conventional solid core wire with a flexible hollow core, enabling continuous production of grouting hollow anchor cable strands. Compared to the conventional solid core wire, which requires extraction and replacement with a straight steel pipe after winding, this grouting hollow anchor cable strand design effectively improves the efficiency of the production process, reduces the number of steps, and achieves high-efficiency production.

[0014] 2. The present invention improves the radial stress and axial tensile force by increasing the contact area between the steel strand and the hollow core through the setting of the arc-shaped outer corner; and further improves the contact friction between the steel strand and the hollow core by setting the diversion notch, and the grout can easily flow from the diversion notch position during the grouting process, thus improving the uniformity of grout overflow.

[0015] 3. The present invention uses chamfering at the connection points of the inner cavity wall core, the hollow cavity core, and the support block to effectively reduce the deformation at the connection points during the expansion deformation of the expansion cavity. The chamfering effectively controls the deformation at both ends of the peaks and valleys of the inner cavity wall core, making it easier to form a long protrusion distance and a large peak and valley effect. Furthermore, the inner cavity wall core's wall thickness is greater than that of the hollow cavity core, which effectively controls the deformation of the inner cavity wall core.

[0016] 4. This invention effectively guides the grouting process by using a corrugated spiral with multiple peaks and valleys and small drop in the troughs inside the grouting flow cavity during the basic grouting process. This facilitates grout delivery while maintaining a good effect of improving compressive strength.

[0017] 5. The present invention uses a hydraulic ring plug to compress the hydraulic fluid filling the expansion chamber, causing the outer edge to expand. This causes the steel strand to be squeezed against the arc-shaped outer corner, increasing the force on the steel strand and the anchor point. This design effectively improves the connection strength between the hollow anchor cable steel strand and the anchor point, thus improving the anchoring stability.

[0018] 6. This invention is based on the expansion of the outer edge of the hollow core, followed by further compression and pushing by a hydraulic ring plug, which compresses the hydraulic fluid filling the expansion cavity. This causes deformation at the arc corner of the inner cavity wall core, resulting in the grouting flow cavity, which has many relatively large arc corners and small trough undulations, being compressed and deformed into a grouting flow cavity with fewer relatively large arc corners and larger trough undulations. The large arc corner and trough undulations further penetrate the grout in the grouting flow cavity. After the grout solidifies, the arc corners and the solidified grout form a reinforced concrete-like effect, thereby improving the overall rigidity and shear strength of the grouting hollow anchor cable strand, further enhancing the actual performance of the grouting hollow anchor cable strand. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the hollow cavity core of the present invention; Figure 3 This is a top view of the hollow cavity core structure of the present invention; Figure 4For the present invention Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0020] Explanation of the labels in the diagram: 1. Hollow core; 2. Steel strand; 3. Pipe clamp; 102. Arc-shaped outer corner; 1021. Contact protrusion; 1202. Diversion groove; 103. Support block; 104. Inner cavity wall core; 1041. Corrugated groove; 1042. Grouting flow cavity; 105. Expansion cavity. Detailed Implementation

[0021] like Figures 1 to 4 As shown, this invention relates to a high-efficiency grouting hollow anchor cable steel strand, comprising a hollow core 1; a plurality of steel strands 2 arranged in annular and equally spaced rings are wound around the outer surface of the hollow core 1; the plurality of steel strands 2 are arranged in a spiral, and are fastened to the hollow core 1 by pipe clamps 3; wherein, the hollow core 1 is provided with a flow channel for grouting; wherein, one end of the hollow core 1 is sealed; and, the other end of the hollow core 1 is connected by a hydraulic ring plug. This invention replaces the conventional solid core wire with a flexible hollow core 1, enabling continuous production of grouting hollow anchor cable steel strands. Compared to the conventional solid core wire, which requires extraction and replacement with straight steel pipes after winding, this grouting hollow anchor cable steel strand design effectively improves the efficiency of the production operation, reduces the number of production steps, and achieves high-efficiency production.

[0022] In an embodiment of the present invention, the outer surface of the hollow core 1 is provided with an arc-shaped outer corner 102 for accommodating the steel strand 2; and a contact protrusion 1021 is provided on the side of the arc-shaped outer corner 102; the contact protrusion 1021 is located between two adjacent steel strands 2, wherein the contact protrusion 1021 is provided with a plurality of diversion grooves 1202 in sequence; wherein the depth of the diversion grooves 1202 intersects with the arc angle of the arc-shaped outer corner 102. The present invention improves the radial stress and increases the axial tensile force by increasing the contact area between the steel strand 2 and the hollow core 1 through the provision of the arc-shaped outer corner 102; and further improves the contact friction between the steel strand 2 and the hollow core 1 through the provision of the diversion grooves 1202, and facilitates the flow of grout from the position of the diversion grooves 1202 during the grouting process, thereby improving the uniformity of grout overflow.

[0023] In an embodiment of the present invention, the hollow core 1 is connected to the inner cavity wall core 104 by a plurality of annularly spaced support blocks 103; wherein, the inner wall of the hollow core 1 forms a plurality of annularly spaced expansion cavities 105 by the plurality of support blocks 103 and the inner cavity wall core 104. The present invention effectively controls the size of the grouting flow channel orifice and the further bonding and frictional contact effect between the steel strand 2 and the hollow core 1 by the deformation setting of the expansion cavities 105.

[0024] In an embodiment of the present invention, several expansion cavities 105 are interconnected; the connections between the inner cavity wall core 104, the hollow cavity core 1, and the support block 103 are all chamfered; and the wall thickness of the inner cavity wall core 104 is greater than the wall thickness of the hollow cavity core 1. The present invention, by chamfering the connections between the inner cavity wall core 104, the hollow cavity core 1, and the support block 103, effectively improves the deformation transition at the connections during the expansion deformation of the expansion cavities 105. Based on the chamfering, the degree of deformation at both ends of the peaks and valleys of the inner cavity wall core 104 is effectively controlled, facilitating the formation of a long protrusion distance and a large peak-valley effect; and by setting the wall thickness of the inner cavity wall core 104 to be greater than the wall thickness of the hollow cavity core 1, the degree of deformation of the inner cavity wall core 104 is effectively controlled.

[0025] In an embodiment of the present invention, both the inner and outer walls of the inner cavity core 104 are provided with helical corrugated grooves 1041; wherein, the corrugated grooves 1041 located relative to an expansion cavity 105 are provided with three undulating arc angles; wherein, the internal gap of the inner cavity core 104 forms a grouting flow cavity 1042 with multiple arc angles and small undulating drop. The present invention effectively guides the grouting operation through the helical corrugated spiral arc angles and small undulating drop within the grouting flow cavity 1042 during foundation grouting, facilitating grout delivery while maintaining a good effect on improving compressive strength.

[0026] In an embodiment of the present invention, the expansion cavity 105 is compressed and pushed by a hydraulic ring plug, causing the outer edge of the expansion cavity 105 to expand. This causes the steel strand 2 to be compressed against the arc-shaped outer corner 102, increasing the force on the steel strand 2 and the anchorage, forming a primary expansion and tensioning structure. The present invention uses a hydraulic ring plug to compress the hydraulic fluid filling the expansion cavity 105, causing the outer edge to expand. This compresses the steel strand 2 against the arc-shaped outer corner 102, increasing the force on the steel strand 2 and the anchorage. This design effectively improves the connection strength between the hollow anchor cable steel strand and the anchorage, thus enhancing anchorage stability.

[0027] In an embodiment of the present invention, the expansion cavity 105 is further squeezed and pushed by the hydraulic ring plug, causing the inner edge of the expansion cavity 105 to expand. This causes the grouting flow cavity 1042 with more relative arc angles and smaller trough undulations to be squeezed and deformed into a grouting flow cavity 1042 with fewer relative arc angles and larger trough undulations, forming a reinforced grout solidification shear-resistant structure. This invention is based on the expansion of the outer edge of the hollow core 1, followed by further compression and pushing by a hydraulic ring plug, which compresses the hydraulic fluid filling the expansion cavity 105. This causes deformation at the arc corner of the inner cavity wall core 104, resulting in the compression and deformation of the grouting flow cavity 1042, which has relatively many arc corners and small trough undulations, into a grouting flow cavity 1042 with relatively few arc corners and large trough undulations. The large arc corner and trough undulations allow for further penetration of the grout in the grouting flow cavity 1042. After the grout solidifies, the arc corners and the solidified grout form a reinforced concrete-like effect, thereby improving the overall rigidity and shear strength of the grouting hollow anchor cable strand, and further enhancing the actual performance of the grouting hollow anchor cable strand.

[0028] Working principle: This embodiment provides a high-efficiency grouting hollow anchor cable strand. Usage steps: S100, Pre-treatment: Cut the required length of grouting hollow anchor cable steel strand, seal one end of each hollow core 1; connect the other end of the hollow core 1 through a hydraulic ring plug; and install the required anchoring accessories; S200, Basic Connection: The grouting hollow anchor cable strand at the sealed end is inserted into the anchoring position through the anchoring fittings; S300, Primary Fastening Setting: Then the tool rotates and adjusts the other end through the hydraulic ring plug. Based on the thread adjustment, the axial distance is advanced, causing the hydraulic fluid filled in the expansion chamber 105 to be compressed, causing the outer edge to expand. This causes the steel strand 2 to be squeezed against the arc-shaped outer corner 102, increasing the force on the steel strand 2 and the anchoring point. This setting effectively improves the connection strength between the hollow anchor cable steel strand and the anchoring point, and improves the anchoring stability. S400 Grouting treatment: Grout is injected into the grouting flow cavity 1042 using a grouting tool and flows out from the other end. When the grouting reaches the required amount, the grout can easily flow from the diversion groove 1202 position, improving the uniformity of grout overflow. S500, Secondary Fastening Setting: Based on the expansion of the outer edge of the hollow core 1 in step S300, the hydraulic ring plug further squeezes and pushes, causing the hydraulic fluid filled in the expansion cavity 105 to be compressed, resulting in deformation at the arc corner of the inner cavity wall core 104. This causes the grouting flow cavity 1042 with more arc corners and smaller trough undulations to be squeezed and deformed into a grouting flow cavity 1042 with fewer arc corners and larger trough undulations. The setting of larger arc corner undulations further penetrates the grout in the grouting flow cavity 1042. After the grout solidifies, the arc corner and the solidified grout form a reinforced concrete-like effect, thereby improving the overall rigidity and shear strength of the grouting hollow anchor cable steel strand.

[0029] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A high-efficiency grouting hollow anchor cable steel strand, characterized in that, Includes a hollow cavity core (1); the outer surface of the hollow cavity core (1) is wound with a plurality of steel strands (2) arranged in a ring at equal intervals; the plurality of steel strands (2) are arranged in a spiral, and the plurality of steel strands (2) are fastened to the hollow cavity core (1) by a pipe clamp (3); The hollow cavity core (1) is provided with a flow channel for grouting; One end of the hollow cavity core (1) is sealed; and the other end of the hollow cavity core (1) is connected by a hydraulic ring plug.

2. The high-efficiency grouting hollow anchor cable strand according to claim 1, characterized in that, The outer surface of the hollow core (1) is provided with an arc-shaped outer corner (102) for accommodating the steel strand (2); and a contact protrusion (1021) is provided on the side of the arc-shaped outer corner (102); the contact protrusion (1021) is located between two adjacent steel strands (2), wherein the contact protrusion (1021) is provided with a plurality of diversion slots (1202) in sequence. The depth of the diversion notch (1202) intersects with the arc angle of the arc-shaped outer convex angle (102).

3. The high-efficiency grouting hollow anchor cable strand according to claim 2, characterized in that, The hollow cavity core (1) is connected to the inner cavity wall core (104) by a number of support blocks (103) arranged in a ring at equal intervals; wherein, the inner wall of the hollow cavity core (1) forms a number of expansion cavities (105) arranged in a ring at equal intervals by a number of support blocks (103) and the inner cavity wall core (104).

4. The high-efficiency grouting hollow anchor cable strand according to claim 3, characterized in that, The expansion cavities (105) are connected to each other; the connection between the inner cavity wall core (104), the hollow cavity core (1) and the support block (103) is chamfered; and the wall thickness of the inner cavity wall core (104) is greater than the wall thickness of the hollow cavity core (1).

5. The high-efficiency grouting hollow anchor cable strand according to claim 4, characterized in that, The inner and outer walls of the inner cavity wall core (104) are provided with spiral corrugated grooves (1041); wherein, the corrugated grooves (1041) located relative to one of the expansion cavities (105) are provided with three undulating arc angles; wherein, the internal gap of the inner cavity wall core (104) forms a grouting flow cavity (1042) with relatively many arc angles and small undulating drop of the troughs.

6. The high-efficiency grouting hollow anchor cable strand according to claim 5, characterized in that, The expansion cavity (105) is pushed by the hydraulic ring plug, causing the outer edge of the expansion cavity (105) to expand, which causes the steel strand (2) to be squeezed against the arc-shaped outer corner (102), increasing the force on the steel strand (2) and the anchor point, and forming a primary expansion tension structure.

7. The high-efficiency grouting hollow anchor cable strand according to claim 6, characterized in that, The expansion cavity (105) is further squeezed and pushed by the hydraulic ring plug, causing the inner edge of the expansion cavity (105) to expand. This causes the grouting flow cavity (1042) with more relative arc angles and smaller trough undulations to be squeezed and deformed into a grouting flow cavity (1042) with fewer relative arc angles and larger trough undulations, forming a reinforced grout solidification shear-resistant structure.

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