Squeeze-type anchor bolt with built-in cartridge

Abstract

A squeeze-type anchor bolt with a built-in cartridge is provided, including a first hollow anchor bolt body and a second hollow anchor bolt body. The first hollow anchor bolt body has an interior provided with a cartridge. The second hollow anchor bolt body is connected to the first hollow anchor bolt body. When the second hollow anchor bolt body is rotating, the second hollow anchor bolt body moves forward relative to the first hollow anchor bolt body along an axial direction of the first hollow anchor bolt body and squeezes an adhesive within the cartridge out from the first hollow anchor bolt body into an anchor hole. When the adhesive within the cartridge is completely squeezed out from the first hollow anchor bolt body, the second hollow anchor bolt body continues rotating and drives the first hollow anchor bolt body to rotate synchronously. The anchor bolt has a simple structure. By providing two segments of anchor bolts with different diameters, the cartridge can be stored inside. Through the rotation of the second hollow anchor bolt body only, the resin within the built-in cartridge can be pushed out into an anchor hole and then the resin in the anchor hole can be stirred. ABSTRACTABSTRACT

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of anchor bolt supporting, more particularly to a squeeze-type anchor bolt with a built-in cartridge. BACKGROUND

[0002] At present, in the fields of geotechnical engineering, mining and tunneling, anchor bolt support systems are widely adopted. Commonly used anchor bolts include resin anchor bolts, grouted anchor bolts, and so on. In mine roadway support systems, the resin anchor bolts have advantages of short curing time and rapid load-bearing capacity, but the cost of the resin material is very high.

[0003] The construction process of the resin anchor bolt is: (1) drilling an anchor hole; (2) feeding a resin cartridge into the anchor hole; (3) inserting an anchor bolt; and (4) rotating the anchor bolt to crush the resin cartridge, so that the resin cartridge is mixed and cured to secure the anchor bolt. In the second step, the feeding of the resin cartridge usually involves directly pushing the resin cartridge into the bottom of the anchor hole using high-pressure water or high-pressure air. However, during usage, because the axial line of the anchor hole is not a standard straight line (that is, the hole is not a straight hole), the friction is high between the resin cartridge and the anchor hole, and the resin cartridge itself is soft and of poor guidance and the like factors, it is difficult for the resin cartridge to be delivered in place. In order to solve the above problem, the existing technology provides a One-Step Resin Cartridge Pre-Stressed Hollow Anchor Bolt, with the publication number of CN114542143A, wherein a resin cartridge is arranged inside an anchor bolt. When delivering the resin to an anchor hole, it is only needed to insert the anchor bolt into the anchor hole and then push the resin into the anchor hole using a pressure liquid.

[0004] However, although the above method can address the problem of resin feeding, during practical production and application, there is a built-in single-use resin mixer, which increases the production cost of anchor bolts. In addition, in order to ensure resin anchoring precedes grouting, there is added a grouting connector that complicates the manufacturing process and raises the cost. Furthermore, a pressure generator is required that not only increases the on-site equipment space, but also poses safety risks during operation. SUMMARY

[0005] The present disclosure aims to overcome the defects of the existing technology by providing a squeeze-type anchor bolt with a built-in cartridge, wherein the anchor bolt has a simple structure, and by providing two segments of anchor bolts with different diameters, the cartridge can be stored inside, and wherein through the rotation of the second hollow anchor bolt body only, the resin within the built-in cartridge can be pushed out into an anchor hole and then the resin in the anchor hole can be stirred.

[0006] The aim of the present disclosure is implemented through the following technical scheme.

[0007] A squeeze-type anchor bolt with a built-in cartridge includes a first hollow anchor bolt body and a second hollow anchor bolt body.

[0008] The first hollow anchor bolt body has an interior provided with a cartridge.

[0009] The second hollow anchor bolt body is connected to the first hollow anchor bolt body. When the second hollow anchor bolt body is rotating, the second hollow anchor bolt body moves forward relative to the first hollow anchor bolt body along an axial direction of the first hollow anchor bolt body and squeezes an adhesive within the cartridge out from the first hollow anchor bolt body into an anchor hole. When the adhesive within the cartridge is completely squeezed out from the first hollow anchor bolt body, the second hollow anchor bolt body continues rotating and drives the first hollow anchor bolt body to rotate synchronously.

[0010] Further, an end part of the first hollow anchor bolt body is provided with a limit piece. The limit piece is configured to prevent the first hollow anchor bolt body rotating synchronously with the second hollow anchor bolt body and to cut through the cartridge when the second hollow anchor bolt body moves forward relative to the first hollow anchor bolt body along the axial direction of the first hollow anchor bolt body.

[0011] Further, the limit piece includes a connecting sleeve, pins and a crushing blade. The connecting sleeve is connected to the end part of the first hollow anchor bolt body. There are at least two pins, the pins being arranged at an end part of the connecting sleeve. The crushing blade is arranged at an opening part of the connecting sleeve along a radial direction of the connecting sleeve.

[0012] Further, the connecting sleeve is in threaded connection with the end part of the hollow anchor bolt body.

[0013] Further, the first hollow anchor bolt body is in threaded connection with the second hollow anchor bolt body.

[0014] Further, the first hollow anchor bolt body is provided with an internal thread, and the second hollow anchor bolt body has an external thread matched with the internal thread.

[0015] Further, the cartridge is arranged between the crushing blade and an end part of the second hollow anchor bolt body.

[0016] The present disclosure has the following beneficial effects.

[0017] (1) The anchor bolt has a simple structure. By providing two segments of anchor bolts with different diameters, the cartridge can be stored inside. Through the rotation of the second hollow anchor bolt body only, the resin within the built-in cartridge can be pushed out into an anchor hole and then the resin in the anchor hole can be stirred.

[0018] (2) The anchor bolt of the present disclosure requires only a rotational drive to the second hollow anchor bolt body to achieve the above functions, with low requirements for equipment and being more conducive to on-site construction. Meanwhile, the simple structure of the anchor bolt of the present disclosure can greatly reduce the production cost of anchor bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is a perspective view of a squeeze-type anchor bolt with a built-in cartridge according to an embodiment of the present disclosure.

[0020] FIG. 2 is a sectional view of a squeeze-type anchor bolt with a built-in cartridge according to an embodiment of the present disclosure.

[0021] FIG. 3 is an enlargement view of part A in FIG. 2.

[0022] FIG. 4 is an enlargement view of part B in FIG. 2.

[0023] Reference numerals in the drawings are illustrated as below. 1, first hollow anchor bolt body; 2, second hollow anchor bolt body; 3, cartridge; 4, limit piece; 5, connecting sleeve; 6, pin; and 7, crushing blade. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] A clear and complete description as below is provided for the technical scheme of the present disclosure in conjunction with the embodiments of the present disclosure. Apparently, the embodiments described hereinafter are merely part embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present disclosure without creative work are intended to be included in the scope of protection of the present disclosure.

[0025] Referring to FIG. 1 to FIG. 4, the present disclosure provides a technical scheme.

[0026] Embodiments

[0027] As shown in FIG. 1 to FIG. 4, a squeeze-type anchor bolt with a built-in cartridge includes a first hollow anchor bolt body 1 and a second hollow anchor bolt body 1.

[0028] The first hollow anchor bolt body 1 has an interior provided with a cartridge 3.

[0029] The second hollow anchor bolt body 2 is connected to the first hollow anchor bolt body 1. When the second hollow anchor bolt body 2 is rotating, the second hollow anchor bolt body 2 moves forward relative to the first hollow anchor bolt body 1 along an axial direction of the first hollow anchor bolt body 1 and squeezes an adhesive within the cartridge 3 out from the first hollow anchor bolt body 1 into an anchor hole. When the adhesive (dual-component resin) within the cartridge 3 is completely squeezed out from the first hollow anchor bolt body 1, the second hollow anchor bolt body 2 continues rotating and drives the first hollow anchor bolt body 1 to rotate synchronously, thereby stirring the adhesive.

[0030] An end part of the first hollow anchor bolt body 1 is provided with a limit piece 4. The limit piece 4 is configured to prevent the first hollow anchor bolt body 1 rotating synchronously with the second hollow anchor bolt body 2 and to cut through the cartridge 3 when the second hollow anchor bolt body 2 moves forward relative to the first hollow anchor bolt body 1 along the axial direction of the first hollow anchor bolt body 1.

[0031] As shown in FIG. 1 and FIG. 3, the limit piece 4 includes a connecting sleeve 5, pins 6 and a crushing blade 7. The connecting sleeve 5 is connected to the end part of the first hollow anchor bolt body 1. There are at least two pins 6 (in the present embodiment, there are three pins 6 and three crushing blades 7), and the pins 6 are arranged at an end part of the connecting sleeve 5. The crushing blade 7 is arranged at an opening part of the connecting sleeve 5 along a radial direction of the connecting sleeve 5.

[0032] Herein, the pins 6 are configured to: (1) provide friction when the anchor hole is in a rock layer. When the anchor hole is in a soil layer, the pins 6 are partially stuck in the soil layer, thereby preventing the first hollow anchor bolt body 1 rotating synchronously with the second hollow anchor bolt body 2. (2) Through the arrangement of the pins 6, a gap is reserved between the end part of the first hollow anchor bolt body 1 and the bottom of the anchor hole, and the gap can ensure the resin within the cartridge 3 to smoothly enter the anchor hole, preventing the occurrence that the resin cannot enter the anchor hole when the end part of the first hollow anchor bolt body 1 abuts against the bottom of the anchor hole.

[0033] The connecting sleeve 5 is in threaded connection with the end part of the hollow anchor bolt body. (In addition, the connecting sleeve 5 can be welded with the hollow anchor bolt body or integrally formed with the hollow anchor bolt body.)

[0034] The first hollow anchor bolt body 1 is in threaded connection with the second hollow anchor bolt body 2.

[0035] As shown in FIG. 2 and FIG. 4, the first hollow anchor bolt body 1 is provided with an internal thread, and the second hollow anchor bolt body 2 has an external thread matched with the internal thread. Alternatively, the second hollow anchor bolt body 2 is provided with an internal thread, the first hollow anchor bolt body 1 has an external thread matched with the internal thread of the second hollow anchor bolt body 2 (that is, the second hollow anchor bolt body 2 has the size of an inner hole matched with an outer diameter of the first hollow anchor bolt body 1), and at this time it is only needed to provide inside the second hollow anchor bolt body 2 an ejector rod that is coaxial with the second hollow anchor bolt body 2, then the cartridge 3 can be pushed out when the second hollow anchor bolt body 2 is moving forward. When arranging the ejector rod, an outer diameter of the ejector rod is less than a diameter of an inner hole of the first hollow anchor bolt body 1. To facilitate grouting, the ejector rod can be a hollow rod body with openings at two ends thereof.

[0036] The cartridge 3 is arranged between the crushing blade 7 and an end part of the second hollow anchor bolt body 2.

[0037] Working principle: (1) Drilling an anchor hole using a drilling machine.

[0038] (2) Putting the squeeze-type anchor bolt with a built-in cartridge 3 into the drilled anchor hole, making the pins 6 at the end part of the first hollow anchor bolt body 1 come into contact with the bottom of the anchor hole, connecting one end of the second hollow anchor bolt body 2 far away the first hollow anchor bolt body 1 to a drilling machine, and then moving the drilling machine toward the bottom of the anchor hole so that the pins 6 are pressed against the bottom of the anchor hole.

[0039] (3) Starting the drilling machine, where the drilling machine drives the second hollow anchor bolt body 2 to rotate. During this process, since the pins 6 abut against the bottom of the anchor hole, the resistance between the first hollow anchor bolt body 1 and the bottom of the anchor hole is greater than the frictional resistance of relative rotation of the thread pair (the first hollow anchor bolt body 1 and the second hollow anchor bolt body 2), that is, it is easier for the second hollow anchor bolt body 2 to overcome the frictional resistance of relative rotation of the thread pair. At this time, the second hollow anchor bolt body 2 is rotating relative to the first hollow anchor bolt body 1 under the function of the drilling machine, and the second hollow anchor bolt body 2 is moving forward along the axial direction of the first hollow anchor bolt body 1.

[0040] During the process of the second hollow anchor bolt body 2 moving forward, the end part of the second hollow anchor bolt body 2 pushes the cartridge 3 to move toward the limit piece 4. When the cartridge 3 comes into contact with the limit piece 4, with the continual pushing of second hollow anchor bolt body 2, the cartridge 3 is cut through by the crushing blade 7, and the (dual-component) resin inside the cartridge 3 is pushed out into the anchor hole.

[0041] (4) When the second hollow anchor bolt body 2 moves to the end part of the first hollow anchor bolt body 1, the cartridge 3 in the first hollow anchor bolt body 1 is completely squeezed out. At this time, the second hollow anchor bolt body 2 has moved to the limit position, and cannot move forward any longer along the axial direction of the first hollow anchor bolt body 1.

[0042] When the second hollow anchor bolt body 2 continues rotating, the second hollow anchor bolt body 2 drives the first hollow anchor bolt body 1 to rotate synchronously (during this process, to ensure a smoother synchronous rotation of the first hollow anchor bolt body 1 and the second hollow anchor bolt body 2, the drilling machine can be pulled back certain distance, thereby reducing the force of the limiting piece 4 abutting against the bottom of the anchor hole.) When the first hollow anchor bolt body 1 and the second hollow anchor bolt body 2 are rotating, the (dual-component) resin inside the anchor hole is stirred, whereby mixing the resin and accelerating the curing of the resin.

[0043] (5) After resin curing, performing grouting. Grouting holes can be formed on the first hollow anchor bolt body 1 and the second hollow anchor bolt body 2 respectively. When the second hollow anchor bolt body 2 moves to the limit position, two grouting holes are aligned, whereby the anchor hole is communicated with the inside and outside of the anchor bolt bodies, allowing a grouting liquid to enter the anchor hole via the grouting holes.

[0044] The anchor bolt of the present disclosure has a simple structure. By providing two segments of anchor bolts with different diameters, the cartridge can be stored inside. Through the rotation of the second hollow anchor bolt body only, the resin within the built-in cartridge can be pushed out into an anchor hole and then the resin in the anchor hole can be stirred. The anchor bolt of the present disclosure requires only a rotational drive to the second hollow anchor bolt body to achieve the above functions, with low requirements for equipment and being more conducive to on-site construction. Meanwhile, the simple structure of the anchor bolt of the present disclosure can greatly reduce the production cost of anchor bolts.

[0045] The foregoing are only preferred embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the forms disclosed herein, and should not be construed as an exclusion of other embodiments, but may be used in various other combinations, modifications, and environments, and modifications can be made within the scope of the concepts described herein, from the above teachings or from skill or knowledge in the relevant field. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present disclosure, and should all fall within the protection scope of the appended claims of the present disclosure.

Claims

1. A squeeze-type anchor bolt with a built-in cartridge, comprising a first hollow anchor bolt body and a second hollow anchor bolt body;the first hollow anchor bolt body having an interior provided with a cartridge; andthe second hollow anchor bolt body being connected to the first hollow anchor bolt body, wherein when the second hollow anchor bolt body is rotating, the second hollow anchor bolt body moves forward relative to the first hollow anchor bolt body along an axial direction of the first hollow anchor bolt body and squeezes an adhesive within the cartridge out from the first hollow anchor bolt body into an anchor hole; and wherein when the adhesive within the cartridge is completely squeezed out from the first hollow anchor bolt body, the second hollow anchor bolt body continues rotating and drives the first hollow anchor bolt body to rotate synchronously.

2. The squeeze-type anchor bolt with the built-in cartridge according to claim 1, wherein an end part of the first hollow anchor bolt body is provided with a limit piece, the limit piece being configured to prevent the first hollow anchor bolt body rotating synchronously with the second hollow anchor bolt body and to cut through the cartridge when the second hollow anchor bolt body moves forward relative to the first hollow anchor bolt body along the axial direction of the first hollow anchor bolt body.

3. The squeeze-type anchor bolt with the built-in cartridge according to claim 2, wherein the limit piece comprises a connecting sleeve, pins and a crushing blade, the connecting sleeve being connected to the end part of the first hollow anchor bolt body; wherein there are at least two pins, the pins being arranged at an end part of the connecting sleeve; and wherein the crushing blade is arranged at an opening part of the connecting sleeve along a radial direction of the connecting sleeve.

4. The squeeze-type anchor bolt with the built-in cartridge according to claim 3, wherein the connecting sleeve is in threaded connection with the end part of the hollow anchor bolt body.

5. The squeeze-type anchor bolt with the built-in cartridge according to claim 3, wherein the first hollow anchor bolt body is in threaded connection with the second hollow anchor bolt body.

6. The squeeze-type anchor bolt with the built-in cartridge according to claim 5, wherein the first hollow anchor bolt body is provided with an internal thread, and wherein the secondhollow anchor bolt body has an external thread matched with the internal thread.

7. The squeeze-type anchor bolt with the built-in cartridge according to claim 6, wherein the cartridge is arranged between the crushing blade and an end part of the second hollow anchor bolt body.

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