A prestressed supporting pile with recyclable reinforcement bar and its reinforcement bar anchor

Abstract

The application relates to a main reinforcement anchorage device of a prestressed support pile with recyclable main reinforcement, which comprises a protective sleeve, a rotating limiting piece and a conical clamp are arranged in the protective sleeve, the conical clamp is arranged on the upper end of the rotating limiting piece, a bottom steel bar is arranged at the lower end of the protective sleeve, a closed ring sleeve is arranged at the upper end of the protective sleeve, a through hole and a conical through hole are arranged on the closed ring sleeve, a stepped counterbore is arranged on the rotating limiting piece, the stepped counterbore comprises a first circular groove and a second circular groove which are sequentially arranged from top to bottom and whose diameters are sequentially reduced, a first internal thread section which is matched with the thread of the fine rolling screw main reinforcement is arranged on the inner wall of the second circular groove, and a screw through hole is arranged on the conical clamp; the upper end of the conical clamp is provided with a conical elastic clamp which can be accommodated in the conical through hole to clamp the fine rolling screw main reinforcement. The application has reasonable structure design, is simple to install, and can guarantee sufficient stability and reliability in a long-term use process.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a main reinforcement anchor for a prestressed support pile with recyclable main reinforcement. Background Technology

[0002] With the rapid development of large-scale infrastructure and urbanization in my country, the number and scale of foundation pit projects, such as basements of super high-rise buildings, underground parking lots, and urban rail transit in major cities, are constantly emerging. Support piles, as important structural components in foundation pit engineering, play a crucial role. However, as temporary support structures in foundation pit projects, the large amount of steel reinforcement within the piles is buried deep underground after the project is completed. This not only results in significant waste but may also cause underground environmental pollution and affect the utilization of adjacent land.

[0003] Currently, there is a lot of research and application of recyclable anchor cables in the industry both at home and abroad, but there is less research on the anchoring and recycling technology of main reinforcement bars of detachable and recyclable prestressed support piles. Moreover, the existing connection structure design between main reinforcement bars and anchor bars is simple and lacks structural reliability. Specifically, the installation process is not stable enough, and stress concentration may occur at the connection points of the anchors, resulting in insufficient pull-out resistance and easy displacement or detachment. Furthermore, it is not easy to recycle and reuse the main reinforcement bars of the support pile. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a main reinforcement anchor for prestressed support piles with recyclable main reinforcement.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a main reinforcement anchor for a prestressed support pile with recyclable main reinforcement, characterized in that it includes a protective sleeve, a rotation limiting member and a conical clamp inside the protective sleeve, the conical clamp being set at the upper end of the rotation limiting member, a bottom reinforcing bar being provided at the lower end of the protective sleeve, and a closing ring being provided at the upper end. The closing ring is provided with an installation through hole and a conical through hole in sequence from top to bottom along its axial direction, and the fine-rolled threaded steel main reinforcement can pass through the installation through hole and the conical through hole in sequence. The rotating limiter is provided with a stepped groove, which includes a first circular groove and a second circular groove whose diameter decreases from top to bottom. The inner wall of the second circular groove is provided with a first internal thread section that is threaded to fit the main reinforcing bar of the fine-rolled threaded steel. The tapered clamp is provided with a threaded steel through hole for the main reinforcing bar of the fine-rolled threaded steel to pass through. The upper end of the tapered clamp has a tapered elastic clamp, and the first circular groove is provided with a first spring that abuts against the lower end of the tapered clamp. The tapered elastic clamp can be housed in the tapered through hole to clamp the fine-rolled threaded steel main bar that passes through.

[0006] As a preferred technical solution, the closed ring is fixed to the upper end of the protective sleeve by a threaded connection. The tapered through hole has a large end and a small end, with the small end of the tapered through hole facing upward and the inner diameter of the small end being equal to the inner diameter of the mounting through hole.

[0007] As a preferred technical solution, the rotating limiting member is a cylindrical shape with an open top, and the outer wall of the rotating limiting member is provided with a first external thread section, and the inner wall of the protective sleeve is provided with a second internal thread section that is threadedly engaged with the first external thread section.

[0008] As a preferred technical solution, the outer wall of the rotation limiting member is provided with a spring pin, and the second internal thread section is provided with a pin groove that cooperates with the spring pin.

[0009] As a preferred technical solution, the outer wall of the rotation limiting member is provided with a pin hole for installing a spring pin. The pin hole penetrates the rotation limiting member radially. The spring pin includes two pins installed in the pin hole. A guide shaft is provided on the opposite side of the two pins. A second spring is provided between the two pins. The second spring is located between the two pins and its two ends abut against the opposite side of the two pins. The second spring is sleeved on the outside of the guide shaft.

[0010] As a preferred technical solution, the upper end of the rotation limiting member is provided with two inverted L-shaped protrusions, which form a locking part with the upper end of the rotation limiting member. The conical elastic clamp is provided with a circular groove, which is inserted into the locking part and clamped by the limiting pad.

[0011] As a preferred technical solution, the protrusion has a horizontal part and a vertical part, and the limiting pad is located between the circular groove and the horizontal part.

[0012] As a preferred technical solution, there are two limiting pads. The limiting pads are provided with guide parts that cooperate with the horizontal part. The limiting pads include a first retaining ring and a second retaining ring located at the upper end of the first retaining ring. The first retaining ring can be inserted into a circular groove, and the second retaining ring is flush with the upper end surface of the horizontal part.

[0013] As a preferred technical solution, the lower end of the protective sleeve is provided with a third circular groove, and the upper end of the bottom reinforcing bar is inserted into the third circular groove and welded to the protective sleeve.

[0014] As a preferred technical solution, the lower end of the conical clamp is provided with an annular groove, the upper end of the first spring extends into the annular groove and abuts against the bottom of the annular groove, and the conical elastic clamp includes a plurality of conical elastic clips evenly distributed along its circumference, and the middle of the conical elastic clips is provided with a through groove.

[0015] The beneficial effects of this application are as follows: 1. The structure of this application is reasonable and easy to install. It can ensure sufficient stability and reliability during long-term use, effectively adapt to various construction environments and working conditions, and has good versatility.

[0016] 2. This application defines the position of the first spring by setting a first circular groove and an annular groove, thereby preventing the first spring from sliding radially.

[0017] 3. The first spring in this application is placed between the rotation limiter and the conical clamp. Its main function is to provide initial preload so that the conical clamp can initially fix the main reinforcing bar of the precision rolled threaded steel bar when the prestress is not tensioned.

[0018] 4. The main purpose of the limiting pad in this application is to fill the hollow area between the rotation limiting component and the conical clamp, and to transmit the tensile force, thereby making the force on the conical clamp more uniform.

[0019] 5. This application sets a spring pin, which, when aligned with the pin groove of the protective sleeve, can pop out of the pin hole of the rotation limiter under the action of the second spring and insert into the pin groove, thereby limiting the rotation limiter and preventing it from moving up and down.

[0020] 6. By setting through grooves, this application reduces the overall stiffness of the tapered elastic clips, making them more susceptible to compression deformation, thereby facilitating the tightening of the main reinforcing bars of the precision-rolled threaded steel. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the invention structure; Figure 2 for Figure 1 Longitudinal cross-section; Figure 3 This is an exploded view of the structure of the present invention; Figure 4 This is a schematic diagram of the structure of the protective sleeve of the present invention; Figure 5 This is a longitudinal cross-sectional view of the protective sleeve of the present invention; Figure 6 This is a schematic diagram of the spring pin structure of the present invention; Figure 7 This is a schematic diagram of the structure of the rotation limiting component of the present invention; Figure 8 This is a longitudinal cross-sectional view of the rotation limiting component of the present invention; Figure 9 This is a schematic diagram of the structure of the limiting pad of the present invention; Figure 10 This is a schematic diagram of the conical clamp of the present invention; Figure 11 This is a longitudinal cross-sectional view of the conical clamp of the present invention; Figure 12 This is a schematic diagram of the closed ring structure of the present invention; Figure 13 This is a longitudinal cross-sectional view of the closed ring of the present invention.

[0022] Markings in the diagram: 1. Bottom reinforcing bar; 2. Protective sleeve; 21. Second internal thread section; 22. Third internal thread section; 23. Pin groove; 24. Third circular countersunk groove; 3. Spring pin; 31. Pin shaft; 311. Guide shaft; 32. Second spring; 4. Rotation limiter; 41. First circular countersunk groove; 42. Second circular countersunk groove; 43. First internal thread section; 44. First external thread section; 45. Pin hole; 46. Protrusion; 461. Water. 462. Horizontal part, 47. Snapping part, 5. First spring, 6. Limiting pad, 61. Guide part, 62. First retaining ring, 63. Second retaining ring, 7. Conical clamp, 71. Conical elastic clamp, 711. Conical elastic clamp piece, 712. Through groove, 72. Circular groove, 73. Circular countersunk groove, 8. Closing ring sleeve, 81. Mounting through hole, 82. Conical through hole, 83. Second external thread section, 9. Fine-rolled threaded steel main reinforcement. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Please see Figure 1-13This invention provides a prestressed support pile anchor with recyclable main reinforcement, including a protective sleeve 2. The protective sleeve 2 contains a rotation limiting member 4 and a conical clamp 7. The conical clamp 7 is located at the upper end of the rotation limiting member 4. The lower end of the protective sleeve 2 has a bottom reinforcing bar 1, and the upper end has a closing ring 8. The closing ring 8 has, along its axial direction from top to bottom, a mounting through hole 81 and a conical through hole 82. The precision-rolled threaded steel main reinforcement 9 can pass through the mounting through hole 81 and the conical through hole 82 sequentially. The rotation limiting member 4 has a stepped groove. The stepped sink includes a first circular sink 41 and a second circular sink 42 with diameters decreasing sequentially from top to bottom. The inner wall of the second circular sink 42 is provided with a first internal thread section 43 that is threaded to engage with the main threaded steel bar 9. The conical clamp 7 is provided with a threaded steel through hole for the main threaded steel bar 9 to pass through. The upper end of the conical clamp 7 is provided with a conical elastic clamp 71. The first circular sink 41 is provided with a first spring 5 that abuts against the lower end of the conical clamp 7. The conical elastic clamp 71 can be housed in the conical through hole 82 to clamp the main threaded steel bar 9 that passes through.

[0025] In this application, the first spring 5 is placed between the rotation limiter 4 and the conical clamp 7. Its main function is to provide initial preload so that the conical clamp 7 can initially fix the main reinforcing bar 9 of the fine-rolled threaded steel bar when the prestress is not tensioned.

[0026] Combination Figure 1 , Figure 2 , Figure 3 , Figure 12 and Figure 13 As shown, the closing ring 8 is fixed to the upper end of the protective sleeve 2 by a threaded connection. The tapered through hole 82 has a large end and a small end, and the tapered through hole 82 has a wedge-shaped contact surface. The wedge-shaped contact surface cooperates with the tapered elastic clamp 71 to convert the vertical tension prestress into circumferential fastening pressure. The greater the vertical tension, the greater the circumferential fastening pressure. The small end of the tapered through hole 82 faces upward, and the inner diameter of the small end is equal to the inner diameter of the mounting through hole 81. The closing ring 8 is provided with a second external thread section. The protective sleeve 2 is a cylindrical shape with an open upper end. The protective sleeve 2 is provided with a third internal thread section 22 that is threaded with the second external thread section. The upper end of the third internal thread section 22 is flush with the upper end face of the closing ring 8. By setting the closing ring 8, a waterproof seal can be achieved to prevent cement slurry from entering the anchor. Combination Figure 1-3 and Figure 5-8As shown, the rotation limiting member 4 is a cylindrical shape with an open top. The outer wall of the rotation limiting member 4 is provided with a first external thread section 44. The inner wall of the protective sleeve 2 is provided with a second internal thread section 21 that is threaded with the first external thread section 44. The outer wall of the rotation limiting member 4 is provided with a spring pin 3. The second internal thread section 21 is provided with a pin groove 23 that mates with the spring pin 3. The outer wall of the rotation limiting member 4 is provided with a pin hole 45 for installing the spring pin 3. The pin hole 45 penetrates the rotation limiting member 4 radially. The spring pin 3 includes two pin shafts 31 installed in the pin hole 45. The two pin shafts 31 are respectively provided with guide shafts 311 on opposite sides. A second spring 32 is provided between the two pin shafts 31. The second spring 32 is located between the two pin shafts 31 and its two ends abut against the opposite sides of the two pin shafts 31 respectively. The second spring 32 is sleeved on the outside of the guide shaft 311.

[0027] This application sets a spring pin 3, which, when aligned with the pin groove 23 of the protective sleeve 2, allows the pin shaft 31 to pop out of the pin hole 45 of the rotation limit member 4 under the action of the second spring 32 and insert into the pin groove 23, thereby limiting the rotation limit member 4 and preventing it from moving up and down.

[0028] The upper end of the rotation limiting member 4 is provided with two inverted L-shaped protrusions 46, which form a locking part 47 with the upper end of the rotation limiting member 4. The protrusions 46 and the rotation limiting member 4 are integrally formed. The conical elastic clamp 71 is provided with a circular groove 72, which is laterally concave and has an upper top surface and a lower ground surface. The circular groove 72 is engaged with the locking part 47 and secured by the limiting pad 6. The protrusions 46 have a horizontal part 461 and a vertical part 462. The limiting pad 6 is located between the circular groove 72 and the horizontal part 461. There are two limiting pads 6, and the limiting pads 6 are provided with a horizontal part 461 and a vertical part 462. The guide part 61 that cooperates with part 461 includes a limiting pad 6 comprising a first retaining ring 62 and a second retaining ring 63 located at the upper end of the first retaining ring 62. The first retaining ring 62 can be inserted into the circular groove 72, and the second retaining ring 63 is flush with the upper end surface of the horizontal part 461. When the limiting pad 6 is tightened, the upper top surface of the circular groove 72 contacts the upper end surface of the horizontal part 461, the first retaining ring 62 is inserted into the circular groove 72, and the lower end surface of the first retaining ring 62 contacts the lower bottom surface of the circular groove 72. Both the first retaining ring 62 and the second retaining ring 63 are semi-circular, and the inner diameter of the first retaining ring 62 is larger than the inner diameter of the second retaining ring 63.

[0029] The limiting pad 6 is inserted into the rotating limiting member 4 from both sides to fix the conical clamp 7. The main purpose of the limiting pad 6 is to fill the hollow area between the rotating limiting member 4 and the conical clamp 7, and to transmit the tensile force, so that the force on the conical clamp 7 is more even.

[0030] Specifically, the lower end of the protective sleeve 2 is provided with a third circular groove 24, and the upper end of the bottom steel bar 1 is inserted into the third circular groove 24 and welded to the protective sleeve 2.

[0031] In addition, combined Figure 2 , Figure 3 , Figure 10 and Figure 11 The conical clamp 7 includes a bottom ring, with a conical elastic clamp 71 at the upper end of the bottom ring and an annular groove 73 at the lower end of the conical clamp 7. The annular groove 73 is located at the lower end of the bottom ring, and the upper end of the first spring 5 extends into the annular groove 73 and abuts against the bottom of the annular groove 73. This application, by setting the first circular groove 41 and the annular groove 73, thereby limiting the position of the first spring 5 and preventing the first spring 5 from sliding radially. The conical elastic clamp 71 includes a plurality of conical springs evenly distributed along its circumference. The clamping piece 711 has multiple conical elastic clamping pieces 711 arranged circumferentially on the upper end of the bottom ring. The conical elastic clamping piece 711 has a through groove 712 in the middle. By setting the through groove 712, the overall stiffness of the conical elastic clamping piece 711 is reduced, making it easier to be deformed under pressure, thereby facilitating the clamping of the main reinforcing bar 9 of the fine-rolled threaded steel. The conical elastic clamping piece 711 is made of spring steel. The inner side of the conical elastic clamping piece 711 is provided with anti-slip texture. The anti-slip texture further facilitates the clamping of the main reinforcing bar 9 of the fine-rolled threaded steel.

[0032] During construction, the purpose of the anchors in this application is to connect the bottom reinforcing bar 1 with the threaded main reinforcing bar 9. The bottom reinforcing bar 1 is inserted into the third circular groove 24 at the bottom of the protective sleeve 2, and the two are sealed and fixedly connected by bolting or welding. The prestressed threaded steel main bar 9 is inserted into the cylindrical hollow area of ​​the anchor closed ring 8, the conical clamp 7, the spring 5, and the rotation limiting ring 4. Under the joint action of the first spring 5 and the conical clamp 7, the anchor will be initially fixed to the prestressed threaded steel main bar 9. When the fine-rolled threaded steel main bar 9 is subjected to the applied prestress tension, the fine-rolled threaded steel main bar 9 will transmit the prestress tension to the rotation limiting member 4 through the thread. Then the tension will be transmitted to the conical clamp 7. Finally, under the action of the wedge-shaped contact surface of the closed ring 8, the vertical tension applied to the conical clamp 7 will be decomposed into circumferential pressure, further clamping the fine-rolled threaded steel main bar 9. The greater the tension of the fine-rolled threaded steel main bar 9, the better the tightening connection effect of the anchor.

[0033] After construction is completed, the anchor of this application can separate the bottom reinforcing bar 1 from the main threaded steel bar 9, so as to achieve the purpose of recycling the main threaded steel bar 9. After the prestress of the main threaded steel bar 9 is unloaded, a pressing and rotating operation is performed. Through the threaded force transmission method, the main threaded steel bar 9 can drive the rotating limiting part 4 to move downward along the wall of the protective sleeve 2, leaving sufficient space for the tapered clamp 7 to retract, reducing the circumferential pressure on the tapered clamp 7, and achieving the effect of releasing the anchor of the main threaded steel bar 9. After the rotating limiting part 4 moves downward along the wall of the protective sleeve 2 to a certain distance, the spring pin 3 passes through the pin hole 45 of the rotating limiting part 4 and is inserted into the pin groove 23 of the protective sleeve 2. Then, by rotating in the opposite direction and pulling out the prestressed main threaded steel bar 9, the recycling of the main threaded steel bar 9 can be achieved.

[0034] Of course, the present invention is not limited to the embodiments described above. Several other embodiments based on the design concept of the present invention are also provided below.

[0035] For example, in other embodiments, unlike the embodiments described above, the spring pin 3 may also be a commonly used spring pin, with one or two spring pins and one or two corresponding pin slots 23.

[0036] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A main reinforcement anchor for a prestressed support pile with recyclable main reinforcement, characterized in that, The protective sleeve (2) is provided with a rotation limiter (4) and a conical clamp (7) inside the protective sleeve (2). The conical clamp (7) is set at the upper end of the rotation limiter (4). The lower end of the protective sleeve (2) is provided with a bottom steel bar (1), and the upper end is provided with a closing ring (8). The closing ring (8) is provided with an installation through hole (81) and a conical through hole (82) from top to bottom along its axial direction. The main reinforcing bar (9) of the fine rolled threaded steel bar can pass through the installation through hole (81) and the conical through hole (82) in sequence. The rotating limiter (4) is provided with a stepped groove, which includes a first circular groove (41) and a second circular groove (42) with diameters decreasing from top to bottom. The inner wall of the second circular groove (42) is provided with a first internal thread section (43) that is threaded to fit the main reinforcing bar (9) of the fine-rolled threaded steel. The tapered clamp (7) is provided with a threaded steel through hole for the main reinforcing bar (9) of the fine-rolled threaded steel. The upper end of the conical clamp (7) has a conical elastic clamp (71), and the first circular groove (41) is provided with a first spring (5) that abuts against the lower end of the conical clamp (7). The conical elastic clamp (71) can be housed in the conical through hole (82) to clamp the fine rolled threaded steel main bar (9) that passes through. The rotation limiting member (4) is a cylindrical shape with an open top. The outer wall of the rotation limiting member (4) is provided with a first external thread section (44), and the inner wall of the protective sleeve (2) is provided with a second internal thread section (21) that is threadedly engaged with the first external thread section (44). The outer wall of the rotation limiting member (4) is provided with a spring pin (3), and the second internal thread section (21) is provided with a pin groove (23) that cooperates with the spring pin (3). The outer wall of the rotation limiting member (4) is provided with a pin hole (45) for installing the spring pin (3). The pin hole (45) passes through the rotation limiting member (4) radially. The spring pin (3) includes two pins (31) installed in the pin hole (45). The two pins (31) are respectively provided with guide shafts (311) on opposite sides. A second spring (32) is provided between the two pins (31). The second spring (32) is located between the two pins (31) and its two ends abut against the opposite sides of the two pins (31). The second spring (32) is sleeved on the outside of the guide shaft (311).

2. The main reinforcement anchor of a prestressed support pile with recyclable main reinforcement according to claim 1, characterized in that: The closed ring (8) is fixed to the upper end of the protective sleeve (2) by a threaded connection. The tapered through hole (82) has a large end and a small end. The small end of the tapered through hole (82) faces upward and the inner diameter of the small end is equal to the inner diameter of the mounting through hole (81).

3. The main reinforcement anchor of a prestressed support pile with recyclable main reinforcement according to claim 1, characterized in that: The upper end of the rotation limiting member (4) is provided with two inverted L-shaped protrusions (46), and the protrusions (46) and the upper end of the rotation limiting member (4) form a locking part (47). The conical elastic clamp (71) is provided with a circular groove (72), which is inserted into the locking part (47) and locked by the limiting pad (6).

4. The main reinforcement anchor of a prestressed support pile with recyclable main reinforcement according to claim 3, characterized in that: The protrusion (46) has a horizontal portion (461) and a vertical portion (462), and the limiting pad (6) is located between the circular groove (72) and the horizontal portion (461).

5. The main reinforcement anchor of a prestressed support pile with recyclable main reinforcement according to claim 4, characterized in that: There are two limiting pads (6). The limiting pads (6) are provided with guides (61) that cooperate with the horizontal part (461). The limiting pads (6) include a first retaining ring (62) and a second retaining ring (63) located at the upper end of the first retaining ring (62). The first retaining ring (62) can be inserted into the circular groove (72), and the second retaining ring (63) is flush with the upper surface of the horizontal part (461).

6. The main reinforcement anchor of a prestressed support pile with recyclable main reinforcement according to claim 1, characterized in that: The lower end of the protective sleeve (2) is provided with a third circular groove (24), and the upper end of the bottom steel bar (1) is inserted into the third circular groove (24) and welded to the protective sleeve (2).

7. The main reinforcement anchor of a prestressed support pile with recyclable main reinforcement according to claim 1, characterized in that: The conical clamp (7) has an annular groove (73) at its lower end. The upper end of the first spring (5) extends into the annular groove (73) and abuts against the bottom of the annular groove (73). The conical elastic clamp (71) includes multiple conical elastic clips (711) evenly distributed along its circumference. The conical elastic clips (711) have a through groove (712) in the middle.

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