Combined reaming device with expanded head anchor rod structure

Abstract

The invention relates to a combined reaming device with an expanded head anchor rod structure. The combined reaming device comprises a drill rod, an anchor rod reaming construction structure and the expanded head anchor rod structure, wherein the anchor rod reaming construction structure and the expanded head anchor rod structure are detachably connected to the drill rod; the anchor rod chambering construction structure comprises a sleeve, a blade gear is arranged in the sleeve and fixedly connected to a drill rod in a sleeving mode, a drill bit is arranged at the bottom end, penetrating out of the sleeve, of the drill rod, a plurality of chambering blades are connected to the blade gear, and through holes are formed in the positions, corresponding to the chambering blades, of the wall of the sleeve. The reaming blade can conveniently stretch out or retract from the through hole under the rotation driving of the blade gear and the drill rod; the expanded head anchor rod structure comprises a hollow anchor rod, the upper end of the anchor rod is detachably connected with a drill rod, the lower end of the anchor rod is connected with a claw-shaped guide head, the bottom end of the claw-shaped guide head and the side face end of the anchor rod are provided with a plurality of grouting holes, and the side face end of the anchor rod is sleeved with a reinforcement cage. The steel reinforcement cage is more rapid in opening mode and not prone to jamming, the structure is simple, construction and assembly are convenient, the construction cost is saved, and the construction efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical reinforcement construction structures, and particularly relates to a combined hole expanding device with an enlarged head anchor structure. Background Technique

[0002] At present, the geotechnical reinforcement structures in geotechnical engineering mainly include various types such as anchor rods, cable bolts, shotcrete, retaining walls, anti-slide piles, etc. As a common geotechnical support means, anchor rods are mainly divided into ordinary anchor rods, self-advancing anchor rods, anti-floating anchor rods, and enlarged head anchor rods according to the force application method and structural characteristics. Among them, the enlarged head anchor rod is provided with an anchoring head with a larger cross-section at the end, which can effectively increase the contact area between the anchor rod and the geotechnical body and improve its uplift resistance, and is widely used in fields such as foundation reinforcement and underground engineering support.

[0003] The principle of the enlarged head anchor rod is to improve the uplift resistance of the anchor rod by setting an enlarged head in the soil layer. The commonly used construction method is: using high-pressure jet grouting to expand the hole, then placing a conventional enlarged head anchor rod and filling it with cement slurry to form an enlarged head in the shape of a column at the end, so as to greatly improve the uplift resistance. At present, the existing construction methods and devices for enlarged head anchor rods still have deficiencies in actual application, such as the single structure of the enlarged head anchor rod, the easy jamming of the opening method, the need to additionally set up a high-pressure jet grouting construction machine during construction, the unsatisfactory hole expanding effect, and the low construction efficiency, etc., and need to be further optimized and improved.

[0004] Therefore, in order to solve the deficiencies existing in the existing enlarged head anchor rod structure and construction technology, the present invention proposes a new type of enlarged head anchor rod structure and its combined hole expanding device. Through the structural improvement of the enlarged head anchor rod and the optimized design of the hole expanding construction device, the present invention aims to improve the construction efficiency and construction quality of the enlarged head anchor rod, reduce the need for additional construction machinery, and has significant engineering application value and economic benefits. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems existing in the prior art, and provide a combined hole expanding device with an enlarged head anchor structure, which can improve the soil hole expanding efficiency and reduce the equipment investment through structural optimization and improvement, ensure the safety and reliability of the opening method of the enlarged head anchor rod through the linkage of relevant components of the anchor rod structure, and diversify the functions of the anchor rod structure.

[0006] To achieve the above technical purpose and reach the above technical effect, the present invention is realized through the following technical solutions: A combined hole expanding device with an enlarged head anchor structure, comprising a drill pipe, and an anchor rod hole expanding construction structure and an enlarged head anchor structure detachably connected to the drill pipe; wherein: The anchor rod hole - expanding construction structure includes a sleeve. A blade gear is arranged inside the sleeve. The blade gear is sleeved and fixed on the drill rod. A number of hole - expanding blades are connected to the blade gear. Through - holes are opened on the sleeve wall at the corresponding positions of the hole - expanding blades, facilitating the hole - expanding blades to extend or retract from the through - holes under the rotational drive of the blade gear and the drill rod. The large - head anchor rod structure includes a hollow anchor rod. The upper end of the anchor rod is detachably connected to the drill rod, and the lower end is connected with a claw - type guide head. A number of grouting holes are arranged at the bottom end of the claw - type guide head and the side end of the anchor rod. A steel reinforcement cage is sleeved outside the side end of the anchor rod, which is used to expand and facilitate grouting.

[0007] Furthermore, a number of sleeve protrusions are arranged on the inner wall of the sleeve, and raised drill rod threads are arranged at the corresponding positions of the drill rod. By rotating the drill rod in different directions, the sleeve protrusions and the drill rod threads interact with each other to drive the overall rotation of the sleeve, and then drive the rotation and expansion of the hole - expanding blades inside the sleeve.

[0008] Furthermore, the hole - expanding blade is a rotating and telescoping structure. In the rotating and contracting state, the hole - expanding blade contracts inside the sleeve, and in the rotating and expanding state, the hole - expanding blade extends out of the sleeve from the through - hole.

[0009] Furthermore, a number of bottom support rods are arranged at the lower end of the anchor rod. One end of the bottom support rod is hinged to the upper part of the claw - type guide head, and the other end is connected to the lower end of the steel reinforcement cage. The upper part of the steel reinforcement cage is connected to a restraint ring. The restraint ring is hinged to a spring lower gasket through a number of upper support rods. A first spring abuts against the upper end of the spring lower gasket, which is used to provide elastic force for expanding the steel reinforcement cage.

[0010] Furthermore, a permeable membrane is connected to the upper support rod. The permeable membrane unfolds under the drive of the upper support rod, which is used to provide a certain pressure in the middle and lower parts of the hole during grouting to make the slurry dense.

[0011] Furthermore, the first spring is sleeved on the anchor rod, with one end abutting against the spring lower gasket and the other end abutting against the raised step surface of the anchor rod.

[0012] Furthermore, the restraint ring includes a telescopic ring and a second spring. The telescopic ring is in contact with the second spring, which is used to elastically restrain or unfold the upper end of the steel reinforcement cage.

[0013] Furthermore, a threaded connection end is arranged on the telescopic ring. The threaded connection end is a split - type structure and is combined into an external threaded column end in the contracted state of the telescopic ring. The external threaded column end is threadedly screwed and matched with the corresponding safety cap to restrain the unfolding of the telescopic ring.

[0014] Furthermore, a starting rod is hinged on the side of the bottom support rod, and the starting rod is laterally slidably inserted into the anchor rod. The anchor rod is vertically penetrated with reinforcement material, and the reinforcement material is connected with a horn plate at the position corresponding to the starting rod. The horn plate is linked with the starting rod, and the vertical movement of the reinforcement material pushes the starting rod to extend outward through the horn plate, thereby pushing the bottom support rod outward to open the steel cage.

[0015] Furthermore, an end nut is provided at the bottom of the reinforcement, and the shape of the end nut matches and penetrates the grouting hole in the claw-shaped guide head.

[0016] The beneficial effects of the present invention are: The anchor rod hole expansion construction structure of the present invention, when working, rotates the drill rod to drive the blade gear to rotate, which can then drive the hole expansion blade to move, extend the blade out of the outer wall of the sleeve, and after rotating to the maximum angle, rotate with the sleeve as a whole to achieve the purpose of hole expansion. Compared with the existing high-pressure rotary spraying device, the present invention has a simple structure, is easy to operate, convenient to assemble, easy to construct, saves construction costs, and can effectively improve construction efficiency.

[0017] The enlarged head anchor rod structure of the present invention has an initial closed state of the anchor rod steel cage. By releasing the constraint of the safety helmet, the spring in the constraint ring drives the radius of the constraint ring to extend to release the external safety device, and the reinforcement material extends into the bottom of the enlarged head anchor rod and links with the starting rod to release the constraint through the high-strength spring on the upper part of the anchor rod to achieve the purpose of expansion. The permeable membrane is unfolded as the steel cage is expanded, and a certain pressure is provided in the middle and lower part of the hole during grouting to make the slurry dense. The claw-type guide head at the bottom ensures that the enlarged head anchor rod is perpendicular to the bottom of the hole and at a certain height from the bottom, which can increase the slurry discharge rate. Compared with the existing enlarged head anchor rod, the steel cage expansion method of the present invention is faster and not easy to get stuck, the slurry discharge rate of the hole is faster, the structure is simple, the operation is convenient, the function is more complete, it is conducive to construction, and the construction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the anchor hole expansion construction structure of the present invention; Figure 2 It is a schematic diagram of the reaming blade of the present invention; Figure 3 It is a partial cross-sectional view of the sleeve of the present invention; Figure 4 It is a schematic diagram of the blade control structure of the present invention; Figure 5 It is a schematic diagram of the structure of the enlarged head anchor rod of the present invention; Figure 6 It is a schematic diagram of the steel cage restraining ring of the present invention; Figure 7 It is a schematic diagram of the bottom of the claw-type guide head of the present invention; Figure 8 This is a structural diagram of the bottom support rod of the enlarged head anchor rod of the present invention; Figure 9 Schematic diagram of the internal grouting holes of the claw-shaped guide head of the present invention; Figure 10 1 / 4 structural sectional view of the bottom of the underreamed anchor bolt of the present invention; Figure 11 Schematic diagram of the connection between the water-permeable membrane and the restraint ring of the underreamed anchor bolt of the present invention; Figure 12 Schematic diagram of the upper connection part of the underreamed anchor bolt of the present invention; Figure 13 Schematic diagram of the expanded state of the steel reinforcement cage of the underreamed anchor bolt of the present invention; Figure 14 Schematic diagram of the internal reinforcement structure of the underreamed anchor bolt of the present invention.

[0019] Description of the reference numerals in the figure: 1 - through hole, 2 - sleeve, 3 - drill bit, 4 - starting rod, 5 - drill pipe, 6 - reaming blade, 7 - drill pipe thread, 8 - sleeve convex block, 9 - safety cap, 10 - restraint ring, 11 - steel reinforcement cage, 12 - bottom support rod, 13 - claw-shaped guide head, 14 - grout outlet hole, 15 - upper support rod, 16 - threaded connection end, 17 - blade gear, 18 - internal partition of the restraint ring, 19 - second spring, 20 - first spring, 21 - reinforcement, 22 - flared piece, 23 - end nut, 24 - water-permeable membrane, 25 - rotating bearing, 26 - anchor bolt, 27 - spring lower gasket. Detailed implementation manners

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] A combined reaming device with an underreamed anchor bolt structure includes a drill pipe 5, and an anchor bolt reaming construction structure and an underreamed anchor bolt structure that are detachably connected to the drill pipe 5. That is, the anchor bolt reaming construction structure and the underreamed anchor bolt structure share the drill pipe 5, and only the rod bolts need to be disassembled and the end devices and components need to be replaced; wherein: As Figure 1 and Figure 2 shown, the anchor bolt reaming construction structure includes a sleeve 2, and a blade gear 17 is arranged inside the sleeve 2. The blade gear 17 is sleeved and fixed on the drill pipe 5. In this embodiment, as Figure 3As shown, the central part of the blade gear 17 is connected to the mounting rod in the sleeve 2. The blade gear 17 is sleeved on the drill pipe 5 by fitting the upper end of the mounting rod. The lower end of the mounting rod is connected with a drill bit 3. A number of reaming blades 6 are connected to the blade gear 17. Through holes 1 are opened on the wall of the sleeve 2 at the corresponding positions of the reaming blades 6. There are four reaming blades 6, and their rotation directions are fixed and all rotate and expand from the inside to the outside. The number of reaming blades 6 corresponds to the four through holes 1, and the number of reaming blades 6 and the corresponding through holes 1 can be changed according to the actual construction needs. The included angles of the four reaming blades 6 are all 45 degrees. The length of the sleeve 2 is 900 - 1200 mm. The through hole 1 is a long slot hole, with a length of 400 - 550 mm and a width of 10 - 15 mm, which is convenient for the reaming blades 6 to extend or retract from the through hole 1 under the rotation drive of the blade gear 17 and the drill pipe 5. Specifically, in the standby state, the length of the reaming blades 6 is less than or equal to the outer wall of the sleeve 2. In the working state, the reaming blades 6 can fully extend out of the sleeve 2, and its length is greater than the outer wall of the sleeve 2. As Figure 5 shown, the expanding head anchor structure includes a hollow anchor rod 26. As Figure 12 shown, the upper end of the anchor rod 26 is detachably connected to the drill pipe 5. Internal threads can be provided at the upper end of the anchor rod 26 to be threadedly connected to the drill pipe 5. As Figure 7 shown, the lower end is connected with a claw-shaped guide head 13. A number of grouting holes 14 are provided at the bottom end of the claw-shaped guide head 13 and the side end of the anchor rod 26. As Figure 9 shown, a corresponding grouting channel is provided inside the claw-shaped guide head 13. A steel reinforcement cage 11 is sleeved outside the side end of the anchor rod 26 for spreading to facilitate grouting.

[0022] As Figure 4 shown, a number of sleeve protrusions 8 are provided on the inner wall of the sleeve 2. At the corresponding position of the drill pipe 5, there are raised drill pipe threads 7 that cooperate with them. By rotating the drill pipe 5 in different directions, the sleeve protrusions 8 and the drill pipe threads 7 interact with each other to drive the overall rotation of the sleeve 2, and then drive the rotation and expansion of the reaming blades 6 in the sleeve 2. When the reaming blades 6 fully extend out of the through hole 1, the reaming blades 6, the sleeve 2, and the drill pipe 5 will rotate as a whole, so as to achieve the purpose of reaming.

[0023] The reaming blade 6 is a rotating and telescoping structure. In the rotating and contracting state, the reaming blade 6 contracts inside the sleeve 2. In this state, it will not cause accidental injury to on-site construction personnel. In the rotating and expanding state, the reaming blade 6 extends out of the sleeve 2 from the through hole 1.

[0024] As Figure 8 shown, a number of bottom support rods 12 are provided at the lower end of the anchor rod 26. One end of the bottom support rod 12 is hinged to the upper part of the claw-shaped guide head 13, and the other end is connected to the lower end of the steel reinforcement cage 11. As Figure 5 and Figure 11As shown, the upper part of the steel reinforcement cage 11 is connected to the restraint ring 10. The restraint ring 10 restrains the steel reinforcement cage 11 through contraction and expansion. The restraint ring 10 is hinged to the spring lower gasket 27 through several upper support rods 15. A first spring 20 abuts against the upper end of the spring lower gasket 27, which is used to provide elastic force for the expansion of the steel reinforcement cage 11.

[0025] As Figure 11 shown, several water-permeable membranes 24 are connected to the upper support rods 15. The water-permeable membranes 24 are unfolded driven by the upper support rods 15, which are used to provide a certain pressure in the middle and lower parts of the hole during grouting to make the slurry dense.

[0026] As Figure 5 shown, the first spring 20 is sleeved on the anchor rod 26, with one end abutting against the spring lower gasket 27 and the other end abutting against the stepped surface of the convex part of the anchor rod 26.

[0027] As Figure 11 shown, the restraint ring 10 includes a telescopic ring and a second spring 19. The telescopic ring is attached to the second spring 19, which is used to elastically restrain or expand the upper end of the steel reinforcement cage 11.

[0028] As Figure 6 and Figure 11 shown, the telescopic ring is provided with a threaded connection end 16. The threaded connection end 16 is a split structure and is combined into an external threaded column end in the contracted state of the telescopic ring. The external threaded column end is threadedly screwed and matched with the corresponding safety cap 9 to restrain the expansion of the telescopic ring. As an external safety device in the initial state of the steel reinforcement cage 11, the steel reinforcement cage 11 will not be accidentally expanded and damaged under normal conditions. After the safety cap 9 is removed, the telescopic ring will extend and expand without breaking.

[0029] As Figure 8 and Figure 10 shown, a starting rod 4 is hinged to the side of the bottom support rod 12. The starting rod 4 is horizontally slidably inserted into the anchor rod 26. A convex block can be arranged at one end of the starting rod 4 located inside the anchor rod 26 for horizontal limit. A reinforcing bar 21 is vertically inserted into the anchor rod 26. As Figure 14 shown, a horn-shaped piece 22 is connected to the reinforcing bar 21 at the position corresponding to the starting rod 4. The horn-shaped piece 22 is linked with the starting rod 4, so that the vertical movement of the reinforcing bar 21 pushes the starting rod 4 to extend out through the horn-shaped piece 22, thereby pushing the bottom support rod 12 outwards to expand the steel reinforcement cage 11.

[0030] The bottom of the reinforcing bar 21 is provided with an end nut 23. The shape of the end nut 23 is matched and penetrated with the grouting hole 14 in the claw-shaped guide head 13.

[0031] The usage process of the present invention is as follows: Step 1: Assemble and connect the drill pipe 5 with the anchor rod reaming construction structure. Use the assembled device and rotate the drill pipe 5 to drive the drill bit 3 at the bottom of the sleeve 2 to drill holes in the soil. When the specified elevation is reached, reverse-rotate the drill pipe 5 for reaming construction; Step 2: After completing the reaming construction, remove the anchor rod reaming construction structure, disassemble the sleeve 2, and simply clean the drill pipe 5 to remove the soil residues on the surface; Step 3: Assemble the cleaned drill pipe 5 with the large-headed anchor rod structure, remove the packaging on the surface of the large-headed anchor rod structure, and pre-align the position of the soil hole; Step 4: After the large-headed anchor rod structure is aligned with the hole position, first remove the safety device outside the steel reinforcement cage 11, that is, the safety helmet 9 at the end of the restraint ring, and then gradually insert the large-headed anchor rod into the specified elevation in the hole; Step 5: After the large-headed anchor rod structure reaches the specified elevation, disassemble the last section of the rod. Insert a reinforcing bar 21 into the anchor rod 26 and extend it to the bottom to penetrate the grouting channel in the claw-shaped guide head 13. Then, the horn-shaped piece 22 at the end of the reinforcing bar 21 acts on the convex block of the starting rod 4 to release the lateral restraint. Finally, the high-strength first spring 20 at the end of the large-headed anchor rod squeezes the steel reinforcement cage 11 to expand, and drives the water-permeable membrane 24 connected to the upper support rod 15 of the large-headed anchor rod structure to unfold. Reassemble the last section of the rod that was disassembled and gradually grout into the hole; Step 6: During the process of grouting into the hole, while grouting, rotate the drill pipe 5 to release the restraint with the large-headed anchor rod structure and slowly withdraw the drill pipe 5 upward to make the grouting more uniform and sufficient. When a small amount of slurry begins to overflow from the hole, immediately stop grouting; Step 7: After completing the grouting, recover the drill pipe 5 for secondary construction use to save the construction period.

[0032] In addition, it should be noted that unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish each component, element, step, etc. in the specification, rather than to represent the logical relationship or sequence relationship, etc. between each component, element, step.

[0033] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A combined hole enlarging device with an enlarged head anchor structure, characterized in that: It comprises a drill rod (5), and an anchor rod hole enlargement construction structure and an enlarged head anchor rod structure which are detachably connected to the drill rod (5); wherein: The anchor bolt hole enlarging construction structure comprises a sleeve (2), a blade gear (17) is arranged in the sleeve (2), the blade gear (17) is sleeved and fixed on the drill rod (5), a plurality of hole enlarging blades (6) are connected to the blade gear (17), and a through hole (1) is opened on the sleeve wall at the position corresponding to the hole enlarging blade (6), so that the hole enlarging blade (6) can be extended or retracted from the through hole (1) under the rotation drive of the blade gear (17) and the drill rod (5); The enlarged head anchor rod structure comprises a hollow anchor rod (26), the upper end of the anchor rod (26) is detachably connected to a drill rod (5), and the lower end is connected to a claw-shaped guide head (13), a plurality of grouting holes (14) are provided at the bottom end of the claw-shaped guide head (13) and the side end of the anchor rod (26), and a steel cage (11) is provided on the outer sleeve of the side end of the anchor rod (26) for being stretched open to facilitate grouting.

2. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 1, characterized in that: A plurality of sleeve protrusions (8) are provided on the inner wall of the sleeve (2), and protruding drill rod patterns (7) that match the sleeve protrusions are provided at corresponding positions of the drill rod (5). The drill rod (5) is rotated in different directions so that the sleeve protrusions (8) and the drill rod patterns (7) constrain each other, thereby driving the sleeve (2) to rotate as a whole, and then driving the expansion blade (6) in the sleeve (2) to rotate and retract.

3. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 2, characterized in that: The reaming blade (6) is a rotating telescopic structure, so that in a rotating contracted state, the reaming blade (6) is contracted inside the sleeve (2), and in a rotating extended state, the reaming blade (6) extends out of the sleeve (2) from the through hole (1).

4. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 1, characterized in that: A plurality of bottom support rods (12) are provided at the lower end of the anchor rod (26); one end of the bottom support rod (12) is hinged to the upper part of the claw-shaped guide head (13); the other end is connected to the lower end of the steel cage (11); the upper part of the steel cage (11) is connected to the restraining ring (10); the restraining ring (10) is hinged to the spring lower gasket (27) through a plurality of upper support rods (15); a first spring (20) is abutted at the upper end of the spring lower gasket (27) to provide elastic force for the steel cage (11) to be stretched open.

5. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 4, characterized in that: The upper support rod (15) is connected to a water-permeable membrane (24), which is deployed under the drive of the upper support rod (15) and is used to provide a certain pressure in the lower part of the hole during grouting to make the slurry dense.

6. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 4, characterized in that: The first spring (20) is sleeved on the anchor rod (26), with one end abutting against the spring lower gasket (27) and the other end abutting against the raised step surface of the anchor rod (26).

7. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 4, characterized in that: The restraining ring (10) comprises a telescopic ring and a second spring (19); the telescopic ring fits the second spring (19) and is used to elastically restrain or expand the upper end of the steel cage (11).

8. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 7, characterized in that: The telescopic ring is provided with a threaded connection end (16), which is a split structure and is combined into an external threaded column end when the telescopic ring is in a contracted state. The external threaded column end is threadedly engaged with a corresponding safety helmet (9) to restrict the expansion of the telescopic ring.

9. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 4 or 8, characterized in that: A starter rod (4) is hingedly connected to the side of the bottom support rod (12), and the starter rod (4) is slidably connected to the anchor rod (26) in a transverse manner. A reinforcement material (21) is vertically connected to the anchor rod (26), and the reinforcement material (21) is connected to a horn plate (22) at a position corresponding to the starter rod (4). The horn plate (22) is linked to the starter rod (4), and the vertical movement of the reinforcement material (21) pushes the starter rod (4) to extend outward through the horn plate (22), thereby pushing the bottom support rod (12) outward to open the steel cage (11).

10. The combined hole enlarging device of the anchor structure with an enlarged head according to claim 8, characterized in that: An end nut (23) is provided at the bottom of the reinforcement (21); the shape of the end nut (23) matches and penetrates the grouting hole (14) in the claw-shaped guide head (13).

Images