Stay cable spiral anchor-pile system and construction method

Abstract

The invention discloses a stay cable spiral anchor-pile system and a construction method, and belongs to the field of pile foundation engineering, the stay cable spiral anchor-pile system comprises a main pile foundation, an anchor cable, a spiral anchor and a ratchet drill rod assembly, the bottom end of the main pile foundation extends below a freezing depth line of soil, the top end of the main pile foundation is exposed out of a ground line, and a plurality of lifting lugs are uniformly arranged around the side wall of the top end of the main pile foundation; the spiral anchors are obliquely arranged on one side of the main pile foundation, the number of the spiral anchors is the same as that of the lifting lugs, the positions of the spiral anchors correspond to the positions of the lifting lugs one to one, the top end of the ratchet drill rod assembly is connected with a drilling machine, and the bottom end of the ratchet drill rod assembly is in driving connection with the top ends of the spiral anchors. One end of the anchor cable is fixed to the top end of the spiral anchor, and the other end of the anchor cable is fixed to the lifting lug. The multiple spiral anchors are obliquely anchored below the freezing depth line around the main pile foundation, the top end of the main pile foundation is obliquely pulled through the anchor cables extending out of the spiral anchors, and freezing pulling displacement of the main pile foundation is avoided.

Description

Technical Field

[0001] The invention belongs to the field of pile foundation engineering, and in particular relates to a stay cable spiral anchor-pile system and a construction method. Background Art

[0002] During construction work in frozen soil areas, the soil layers within the frozen depth range of seasonal frozen soil areas will experience frost heave, thaw and sink phenomena with seasonal changes. The frost heave of the soil within the frozen depth will produce frost pullout effects on the pile foundations in the frozen soil areas, increasing the cost of infrastructure operation and maintenance. In severe cases, it will also cause safety accidents such as tilting and cracking of the pile foundation superstructure, seriously affecting the safety of the upper structure or building. In the prior art, a spiral structure is added to the bottom of the pile foundation to increase the anti-freeze pullout effect of the entire pile foundation in the frozen soil area. The spiral structure passes through the frozen soil layer area. When the temperature drops in winter, the soil in the frozen depth area freezes and expands, generating a vertical upward frost heave force on the pile foundation; in addition, the upper part of the pile foundation will also be subject to the horizontal thrust generated by other loads, which may cause the pile foundation to tilt, resulting in poor anti-freeze pullout effect. Summary of the invention

[0003] In view of this, the present invention provides a stay cable spiral anchor-pile system and a construction method to solve the above problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A stay cable spiral anchor-pile system comprises: a main pile foundation, an anchor cable, a spiral anchor and a ratchet drill rod assembly, wherein the bottom end of the main pile foundation extends below the freezing depth line of the soil, and the top end protrudes out of the ground line, a plurality of lifting ears are evenly arranged around the top side wall of the main pile foundation, the spiral anchor is arranged obliquely on one side of the main pile foundation, the number of the spiral anchors is set to be multiple and is the same as the number of the lifting ears, the positions of the plurality of spiral anchors correspond one to one to the plurality of lifting ears, the top end of the ratchet drill rod assembly is connected to a drilling rig, and the bottom end is drivingly connected to the top end of the spiral anchor, one end of the anchor cable is fixed to the top end of the spiral anchor, and the other end is fixed to the lifting ear.

[0006] Furthermore, the ratchet drill rod assembly includes a ratchet and a drill rod, the ratchet is installed at the bottom end of the drill rod, a plurality of right-handed teeth are arranged around the ratchet, a ratchet groove is arranged at the center of the top end of the spiral anchor, a plurality of telescopic tooth mounting grooves are evenly arranged around the top end of the spiral anchor, the openings of the plurality of telescopic tooth mounting grooves point to the axis of the spiral anchor, the plurality of telescopic tooth mounting grooves are connected with the ratchet groove, a telescopic tooth assembly is arranged in each of the telescopic tooth mounting grooves, the telescopic tooth assembly includes telescopic teeth and a spring, one end of the spring is fixedly connected to the side wall of the telescopic tooth mounting groove away from the opening end, and the other end is fixedly connected to the telescopic teeth, the telescopic teeth are slidably connected to the telescopic tooth mounting groove, the ratchet is rotatably connected in the ratchet groove, and the protruding end of the telescopic teeth is drivingly connected to the right-handed teeth of the ratchet.

[0007] Furthermore, the extending end of the telescopic tooth is provided with a first vertical surface and a first inclined surface, the right-handed tooth is provided with a second vertical surface and a first curved surface, the first vertical surface is drivingly connected to the second vertical surface, and the first curved surface is slidingly connected to the first inclined surface.

[0008] Furthermore, a cover plate is fixedly provided on the top end of the spiral anchor, and the top end of the telescopic teeth is slidably connected to the cover plate, and the cover plate is used to prevent the telescopic teeth from falling out.

[0009] Furthermore, the bottom surface and side walls of the ratchet groove are provided with anchor cable avoidance grooves.

[0010] Furthermore, a spiral anchor groove is provided on the side wall of the drill rod.

[0011] A construction method of a stay cable spiral anchor-pile system, comprising the following steps:

[0012] S1. First determine the location of the main pile foundation, then plan the number of spiral anchors, as well as the inclination angle and position of the spiral anchors around the main pile foundation;

[0013] S2. The ratchet passes through the cover plate into the ratchet sink groove, so that the first vertical surface and the second vertical surface are attached; the top of the drill rod is connected to the output end of the drill;

[0014] S3. The drill rig drives the drill rod to rotate clockwise, and the drill rod drives the ratchet to rotate clockwise. The second vertical surface of the right-handed tooth on the ratchet pushes the first vertical surface of the telescopic tooth, thereby driving the spiral anchor to rotate clockwise, so that the spiral anchor is tilted and drilled below the freezing depth of the soil; during the process, the anchor cable is continuously wound around the drill rod;

[0015] S4. After the spiral anchor reaches the predetermined position, the drill rig drives the drill rod to rotate in the opposite direction, thereby causing the ratchet to rotate in the opposite direction in the ratchet groove, and the first arc surface is slidably connected with the first inclined surface, pushing the telescopic teeth to slide in the telescopic teeth mounting groove to compress the spring, and the drill rod continuously rotates in the opposite direction to disengage the anchor cable from the side wall of the drill rod, and finally the drill rod and the ratchet are pulled out;

[0016] S5. After the drill rod is pulled out, the anchor cable is straightened and properly tensioned, so that the spiral anchor is tilted and anchored below the freezing depth line;

[0017] S6. Repeat steps S1 to S5 until the anchoring of other inclined spiral anchors is completed;

[0018] S7. After the main pile foundation is constructed, tighten the other ends of the anchor cables on the multiple spiral anchors and anchor them on the lifting lugs.

[0019] Furthermore, in step S2, when the ratchet enters the ratchet groove, the anchor cable at the top of the spiral anchor is embedded in the anchor cable avoidance groove to avoid friction between the ratchet and the anchor cable when the ratchet rotates on the bottom wall of the ratchet groove.

[0020] Furthermore, in step S3, as the spiral anchor is continuously tilted and sunk and the drill rod is continuously extended downward, the ground staff should continuously wind the anchor cable around the spiral anchor cable groove as the drill rod rotates.

[0021] The beneficial effects of the present invention are:

[0022] The present invention arranges a plurality of inclined spiral anchors below the freezing depth line around the main pile foundation for anchoring, the anchor cable extending from the top end of the spiral anchor is fixedly connected with the lifting lug at the top end of the main pile foundation, the anchor cable obliquely pulls the top end of the main pile foundation in multiple directions around, effectively improving the anti-freezing and pulling effect of the main pile foundation, and can prevent the main pile foundation from tilting when subjected to other horizontal forces; the drill rod rotates clockwise, and the ratchet at the bottom end of the drill rod drives the spiral anchor to rotate through the telescopic teeth to drill a hole, and the anchor cable is continuously wound around the drill rod, and when the drill rod rotates in the opposite direction, the ratchet rotates in the ratchet groove, so that the anchor cable is continuously separated from the drill rod, and after the anchor cable is completely separated from the drill rod, the drill rod is pulled out and tightened, and finally the inclined anchoring of the spiral anchor is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1It is a structural schematic diagram of a stay cable spiral anchor-pile system;

[0025] Figure 2 It is a three-dimensional structural diagram of the spiral anchor and the drill rod;

[0026] Figure 3 yes Figure 2 A magnified view of middle;

[0027] Figure 4 It is a top view schematic diagram of a helical anchor;

[0028] Figure 5 is a top view schematic diagram of a helical anchor without a cover plate;

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the spiral anchor without a cover plate;

[0030] Figure 7 yes Figure 6 Enlarged view of middle B;

[0031] Figure 8 It is a three-dimensional structural diagram of the drill pipe;

[0032] Among them, in the figure:

[0033] 1-main pile foundation, 2-anchor cable, 3-spiral anchor, 4-lifting ear, 5-ratchet, 6-drill rod, 7-right-hand tooth, 8-ratchet groove, 9-telescopic tooth installation groove, 10-telescopic tooth assembly, 11-telescopic tooth, 12-spring, 13-first vertical surface, 14-first inclined surface, 15-second vertical surface, 16-first curved surface, 17-cover plate, 18-anchor cable avoidance groove, 19-spiral anchor cable groove. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See attached Figure 1-8As shown, the present invention provides a cable-stayed spiral anchor-pile system, comprising: a main pile foundation 1, an anchor cable 2, a spiral anchor 3 and a ratchet drill rod assembly, wherein the bottom end of the main pile foundation 1 extends below the freezing depth line of the soil, and the top end leaks out of the ground line, a plurality of lifting ears 4 are evenly arranged around the top side wall of the main pile foundation 1, the spiral anchor 3 is arranged obliquely on one side of the main pile foundation 1, the number of the spiral anchors 3 is set to be multiple, and the number is the same as the number of the lifting ears 4, the positions of the plurality of spiral anchors 3 correspond one to one to the plurality of lifting ears 4, the top end of the ratchet drill rod assembly is connected to the drilling rig, and the bottom end is drivingly connected to the top end of the spiral anchor 3, one end of the anchor cable 2 is fixed to the top end of the spiral anchor 3, and the other end is fixed to the lifting ear 4.

[0037] In a preferred embodiment, the ratchet drill rod assembly includes a ratchet 5 and a drill rod 6, the ratchet 5 is installed at the bottom end of the drill rod 6, a plurality of right-handed teeth 7 are arranged around the ratchet 5, a ratchet groove 8 is arranged at the center of the top end of the spiral anchor 3, a plurality of telescopic tooth mounting grooves 9 are evenly arranged around the top end of the spiral anchor 3, the openings of the plurality of telescopic tooth mounting grooves 9 point to the axis of the spiral anchor 3, the plurality of telescopic tooth mounting grooves 9 are connected with the ratchet groove 8, a telescopic tooth assembly 10 is arranged in the telescopic tooth mounting groove 9, the telescopic tooth assembly 10 includes a telescopic tooth 11 and a spring 12, one end of the spring 12 is fixedly connected to the side wall of the telescopic tooth mounting groove 9 away from the opening end, and the other end is fixedly connected to the telescopic tooth 11, the telescopic tooth 11 is slidably connected to the telescopic tooth mounting groove 9, the ratchet 5 is rotatably connected in the ratchet groove 8, and the protruding end of the telescopic tooth 11 is drivingly connected to the right-handed tooth 7 of the ratchet 5.

[0038] In a preferred embodiment, the protruding end of the telescopic tooth 11 is provided with a first vertical surface 13 and a first inclined surface 14, the right-handed tooth 7 is provided with a second vertical surface 15 and a first curved surface 16, the first vertical surface 13 is drivingly connected to the second vertical surface 15, and the first curved surface 16 is slidingly connected to the first inclined surface 14.

[0039] In a preferred embodiment, a cover plate 17 is fixedly provided on the top of the spiral anchor 3, and the top of the telescopic tooth 11 is slidably connected to the cover plate 17, and the cover plate 17 is used to prevent the telescopic tooth 11 from falling out.

[0040] In a preferred embodiment, the bottom surface and side walls of the ratchet groove 8 are provided with anchor cable avoidance grooves 18 .

[0041] In a preferred embodiment, a spiral anchor groove 19 is provided on the side wall of the drill rod 6 .

[0042] Example 2

[0043] A construction method of a stay cable spiral anchor-pile system, comprising the following steps:

[0044] S1. First determine the position of the main pile foundation 1, and then plan the number of spiral anchors 3, as well as the inclination angle and position of the spiral anchor 3 around the main pile foundation 1;

[0045] S2. The ratchet 5 passes through the cover plate 17 and enters the ratchet groove 8, so that the first vertical surface 13 and the second vertical surface 15 are attached; the top of the drill rod 6 is connected to the output end of the drilling rig; during the ratchet 5 entering the ratchet groove 8, the anchor cable 2 at the top of the spiral anchor 3 is embedded in the anchor cable avoidance groove 18 to avoid friction between the ratchet 5 and the anchor cable 2 when rotating on the bottom wall of the ratchet groove 8;

[0046] S3. The drilling rig drives the drill rod 6 to rotate clockwise, and the drill rod 6 drives the ratchet 5 to rotate clockwise. The second vertical surface 15 of the right-handed tooth 7 on the ratchet 5 pushes the first vertical surface 13 of the telescopic tooth 11, thereby driving the spiral anchor 3 to rotate clockwise, so that the spiral anchor 3 is tilted and drilled below the frozen depth line of the soil; during the process, the anchor cable 2 is continuously wound around the drill rod 6; during the process of the spiral anchor 3 continuously tilting and sinking and the drill rod 6 continuously extending downward, the ground staff should continuously wind the anchor cable 2 around the spiral anchor cable groove 19 as the drill rod 6 rotates;

[0047] S4. After the spiral anchor 3 reaches the predetermined position, the drilling rig drives the drill rod 6 to rotate in the reverse direction, thereby causing the ratchet 5 to rotate in the reverse direction in the ratchet groove 8, and the first arc surface 16 is slidably connected with the first inclined surface 14, pushing the telescopic teeth 11 to slide in the telescopic teeth mounting groove 9 to compress the spring 12, and the drill rod 6 continuously rotates in the reverse direction to disengage the anchor cable 2 from the side wall of the drill rod 6, and finally the drill rod 6 and the ratchet 5 are pulled out;

[0048] S5. After the drill rod 6 is pulled out, the soil around the borehole wraps the anchor cable 2, the anchor cable 2 is straightened and properly tensioned, so that the spiral anchor 3 is tilted and anchored below the freezing depth line;

[0049] S6. Repeat steps S1 to S5 until the anchoring of other inclined spiral anchors 3 is completed;

[0050] S7. After the main pile foundation 1 is constructed, the other ends of the anchor cables 2 on the plurality of spiral anchors 3 are tightened and anchored on the lifting lugs 4 .

[0051] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stay cable spiral anchor-pile system, characterized in that: include: A main pile foundation (1), an anchor cable (2), a spiral anchor (3) and a ratchet drill rod assembly, wherein the bottom end of the main pile foundation (1) extends below the freezing depth line of the soil, and the top end protrudes above the ground line; a plurality of lifting ears (4) are evenly arranged around the top side wall of the main pile foundation (1); the spiral anchor (3) is arranged obliquely on one side of the main pile foundation (1); the number of the spiral anchors (3) is set to be multiple and is the same as the number of the lifting ears (4); the positions of the multiple spiral anchors (3) correspond to the multiple lifting ears (4) one by one; the top end of the ratchet drill rod assembly is connected to a drilling rig, and the bottom end is drivingly connected to the top end of the spiral anchor (3); one end of the anchor cable (2) is fixed to the top end of the spiral anchor (3), and the other end is fixed to the lifting ear (4).

2. A stay cable spiral anchor-pile system according to claim 1, characterized in that: The ratchet drill rod assembly comprises a ratchet (5) and a drill rod (6), wherein the ratchet (5) is mounted at the bottom end of the drill rod (6), a plurality of right-handed teeth (7) are arranged around the ratchet (5), a ratchet groove (8) is arranged at the center of the top end of the spiral anchor (3), a plurality of telescopic tooth mounting grooves (9) are evenly arranged around the top end of the spiral anchor (3), the openings of the plurality of telescopic tooth mounting grooves (9) point to the axis of the spiral anchor (3), the plurality of telescopic tooth mounting grooves (9) are connected to the ratchet groove (8), and the telescopic tooth mounting grooves (9) are arranged to be connected to the spiral anchor (3). 9) are provided with a telescopic tooth assembly (10), the telescopic tooth assembly (10) comprising a telescopic tooth (11) and a spring (12), one end of the spring (12) is fixedly connected to the side wall of the telescopic tooth mounting groove (9) away from the opening end, and the other end is fixedly connected to the telescopic tooth (11), the telescopic tooth (11) is slidably connected to the telescopic tooth mounting groove (9), the ratchet (5) is rotatably connected in the ratchet groove (8), and the protruding end of the telescopic tooth (11) is drivingly connected to the right-handed tooth (7) of the ratchet (5).

3. A stay cable spiral anchor-pile system according to claim 2, characterized in that: The extended end of the telescopic tooth (11) is provided with a first vertical surface (13) and a first inclined surface (14), and the right-handed tooth (7) is provided with a second vertical surface (15) and a first curved surface (16), the first vertical surface (13) is drivingly connected to the second vertical surface (15), and the first curved surface (16) is slidingly connected to the first inclined surface (14).

4. A stay cable spiral anchor-pile system according to claim 2, characterized in that: A cover plate (17) is also fixedly provided at the top end of the spiral anchor (3), and the top end of the telescopic tooth (11) is slidably connected to the cover plate (17). The cover plate (17) is used to prevent the telescopic tooth (11) from falling out.

5. The stay cable spiral anchor-pile system according to claim 2, characterized in that: The bottom surface and side walls of the ratchet wheel groove (8) are provided with anchor cable avoidance grooves (18).

6. A stay cable spiral anchor-pile system according to claim 2, characterized in that: A spiral anchor groove (19) is provided on the side wall of the drill rod (6).

7. A construction method for a stay cable spiral anchor-pile system, characterized in that: The steps include: S1. First determine the position of the main pile foundation (1), and then plan the number of spiral anchors (3), as well as the inclination angle and position of the spiral anchors (3) around the main pile foundation (1); S2. The ratchet (5) passes through the cover plate (17) and enters the ratchet groove (8), so that the first vertical surface (13) and the second vertical surface (15) are adjacent to each other; the top of the drill rod (6) is connected to the output end of the drill; S3. The drilling rig drives the drill rod (6) to rotate clockwise, and the drill rod (6) drives the ratchet (5) to rotate clockwise. The second vertical surface (15) of the right-handed tooth (7) on the ratchet (5) pushes the first vertical surface (13) of the telescopic tooth (11), thereby driving the spiral anchor (3) to rotate clockwise, so that the spiral anchor (3) is tilted and drilled below the freezing depth of the soil; during the process, the anchor cable (2) is continuously wound around the drill rod (6); S4. After the spiral anchor (3) reaches the predetermined position, the drilling rig drives the drill rod (6) to rotate in the opposite direction, thereby causing the ratchet (5) to rotate in the opposite direction in the ratchet groove (8), and the first arc surface (16) is slidably connected with the first inclined surface (14), pushing the telescopic teeth (11) to slide in the telescopic teeth mounting groove (9) to compress the spring (12), and the drill rod (6) continuously rotates in the opposite direction to disengage the anchor cable (2) from being wrapped around the side wall of the drill rod (6), and finally the drill rod (6) and the ratchet (5) are pulled out; S5. After the drill rod (6) is pulled out, the anchor cable (2) is straightened and appropriately tensioned, thereby obliquely anchoring the spiral anchor (3) below the freezing depth line; S6. Repeat steps S1 to S5 until the anchoring of other inclined spiral anchors (3) is completed; S7. After the main pile foundation (1) is constructed, the other ends of the anchor cables (2) on the plurality of spiral anchors (3) are tightened and anchored on the lifting lugs (4).

8. The construction method of the stayed cable spiral anchor-pile system according to claim 7, characterized in that: In step S2, when the ratchet (5) enters the ratchet groove (8), the anchor cable (2) at the top of the spiral anchor (3) is embedded in the anchor cable avoidance groove (18) to prevent the ratchet (5) from rubbing against the anchor cable (2) when rotating on the bottom wall of the ratchet groove (8).

9. The construction method of the inclined cable spiral anchor-pile system according to claim 7, characterized in that: In step S3, as the spiral anchor (3) continuously tilts and sinks and the drill rod (6) continuously extends downward, the ground staff should continuously wind the anchor cable (2) around the spiral anchor cable groove (19) as the drill rod (6) rotates.

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