CN112049130B

CN112049130B - H-shaped hollow anti-slide pile

Info

Publication number: CN112049130B
Application number: CN202010931828.4A
Authority: CN
Inventors: 马云长; 朱伟; 马飞跃; 邓世平; 徐清清; 戚鹏英; 张菊锋
Original assignee: Nuclear Industry Huzhou Survey Planning Design And Research Institute Co ltd
Current assignee: Nuclear Industry Huzhou Survey Planning Design And Research Institute Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-11-02
Anticipated expiration: 2040-09-07
Also published as: CN112049130A

Abstract

The invention discloses an h-shaped hollow anti-slide pile, which comprises a front pile and a rear pile, wherein a cross beam is connected between the front pile and the rear pile, the front pile comprises a first pile front end and a first pile rear end, a first hollow hole is formed between the first pile front end and the first pile rear end, the rear pile comprises a second pile front end and a second pile rear end, a second hollow hole is formed between the second pile front end and the second pile rear end, a front pile convex block is arranged at the position, close to the cross beam, of the front pile, a rear pile convex block is arranged at the position, close to the cross beam, of the rear pile, the front pile convex block and the rear pile convex block are both positioned below the cross beam, the bottoms of the front pile and the rear pile penetrate through a slide belt and are positioned in a slide bed, the tops of the front pile and the rear pile are positioned in the slide bed, a first reinforcing steel bar is embedded in the front pile, and a second reinforcing steel bar is embedded in the rear pile. Has the advantages that: the soil arch effect of the soil body between the piles is fully exerted, and the anti-slide pile is more favorable for supporting the landslide.

Description

H-shaped hollow anti-slide pile

Technical Field

The invention relates to the technical field of civil engineering and geotechnical engineering, in particular to an h-shaped hollow slide-resistant pile.

Background

In the field of landslide control, the slide-resistant pile is widely applied to landslide support, but has the defects of insufficient bending resistance, small integral rigidity and the like of common slide resistance. The anti-skid performance of the anti-skid piles is improved by adopting different measures, such as increasing the cross section area of a single pile or making a pile body into a trapezoid to increase the pressure resistance of the pile body, but the consumption of concrete is increased, and the construction cost is increased.

However, when dealing with large landslides, the disadvantage of insufficient sliding resistance of the single pile is clearly revealed. The former adopts anchor cable slide-resistant piles, h-shaped slide-resistant piles and the like, and the defect of insufficient slide-resistant capability of a single pile is overcome to a certain extent. At present, most of the anti-slide piles are solid piles, and the cross sections of the anti-slide piles are circular or rectangular, so that the consumption of concrete is increased, and the manufacturing cost of a pile body is increased; on the other hand, the stressed part of the pile body is not subjected to differential analysis, so that the building materials are wasted to a certain extent.

An effective solution to the problems in the related art has not been proposed yet.

Disclosure of Invention

The invention aims to provide an h-shaped hollow anti-slide pile to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: an h-shaped hollow anti-slide pile comprises a front pile and a rear pile, wherein a cross beam is connected between the front pile and the rear pile, the front pile comprises a first pile front end and a first pile rear end, a first hollow hole is formed between the first pile front end and the first pile rear end, the rear pile comprises a second pile front end and a second pile rear end, a second hollow hole is formed between the second pile front end and the second pile rear end, a front pile convex block is arranged at the position, close to the cross beam, of the front pile, a rear pile convex block is arranged at the position, close to the cross beam, of the rear pile, the front pile convex block and the rear pile convex block are both positioned below the cross beam, a sliding belt penetrates through the bottoms of the front pile and the rear pile and are positioned in a sliding bed, the tops of the front pile and the rear pile are positioned in a sliding body, a first reinforcing steel bar is embedded in the front pile, a second reinforcing steel bar is embedded in the rear pile, and a stabilizing mechanism is arranged between the front pile and the rear pile and below the cross beam, the top of the cross beam is provided with a reinforcing mechanism, the stabilizing mechanism comprises a first connecting block, a first groove, a cross rod and a stabilizing sleeve, the first pile rear end and the first pile front end are fixedly connected with the first connecting block, the top of the first connecting block is provided with the first groove, the cross rod is arranged between the first connecting blocks, a port of the cross rod is positioned in the first groove, the bottom of the cross rod is fixedly connected with the stabilizing sleeve, a connecting mechanism is arranged between the first connecting block and the cross rod, a telescopic mechanism is arranged in the stabilizing sleeve, the connecting mechanism comprises a second groove, a first spring, a movable block and a first connecting groove, the inner wall of the first groove is provided with a second groove, the interior of the second groove is connected with the movable block through the first spring, the port of the cross rod is provided with the first connecting groove matched with the movable block, and the top and the bottom of the movable block are fixedly connected with a first limiting block, a first limiting groove is formed in the position, close to the first limiting block, in the second groove, the first limiting block is located in the first limiting groove and matched with the first limiting groove, a push rod is fixedly connected to one side of the movable block, an opening is formed in one side of the second groove, one end, far away from the movable block, of the push rod penetrates through the opening and is fixedly connected with the first pushing block, the telescopic mechanism comprises a movable rod, a first connecting rod, a fixed block, a movable block and a second spring, a movable rod is arranged in the stabilizing sleeve and matched with the inner portion of the stabilizing sleeve, a first connecting rod is fixedly connected to the top of the movable rod, a movable block is fixedly connected to the top end of the first connecting rod, a fixed block is fixedly connected to the inside of the stabilizing sleeve, a first connecting rod penetrates through the fixed block, and a second spring is connected between the fixed block and the movable block, the second spring is wound on the outer surface of the first connecting rod, one side of the movable rod is fixedly connected with a second limiting block, a second limiting groove is formed in the position, close to the second limiting block, of the stabilizing sleeve, the second limiting block is located in the second limiting groove and matched with the second limiting groove, a second connecting block is connected between the second limiting blocks, the second connecting rod is fixedly connected to the top of the second connecting block, a circular ring is fixedly connected to the top of the second connecting rod, the reinforcing mechanism comprises a first connecting sleeve, a U-shaped rod, a second connecting sleeve, a third spring, a third connecting block, a convex block and a second connecting groove, the two first connecting sleeves are fixedly connected to the top of the cross beam, the second connecting sleeve is connected to the first connecting sleeve, the third connecting block is connected to the inside of the second connecting sleeve through the third spring, and the convex block is fixedly connected to one side, far away from the third spring, of the third connecting block, the port of lug runs through the adapter sleeve I just is located the inside of adapter sleeve I is equipped with U type pole between two crossbeams, the port of U type pole is located inside the adapter sleeve I, just the lateral wall of U type pole open have with lug assorted spread groove two, the bottom fixedly connected with ejector pad two of connecting block three, the bottom of adapter sleeve two just is close to ejector pad two department opens there is opening two, the port of ejector pad two runs through opening two just is located the outside of opening two.

Furthermore, the included angle between the first pile front end and the first hollow hole is 50-60 degrees, and the included angle between the second pile front end and the second hollow hole is 50-60 degrees.

Compared with the prior art, the invention has the following beneficial effects:

(1) the shapes of the front pile and the rear pile are made into isosceles trapezoids, the first pile front end and the second pile front end increase the contact between the piles and soil, the damage area of the soil is reduced, the side face and the front face of the rear pile are squeezed by the soil, the soil arch effect of the soil among the piles is fully played, and the anti-slide pile is more favorable for supporting a landslide.

(2) Because stake front end one and stake front end two mainly receive the effect of landslide thrust, change the arrangement of the inside reinforcing bar of preceding stake and back stake, increased the crushing resistance of stake front end one and stake front end two.

(3) Due to the arrangement of the cross beam, on one hand, the compression resistance of the slide-resistant pile is improved due to the arrangement of the cross beam, and the slide-resistant pile is prevented from being damaged by compression; on the other hand, the cross beam is accurately placed between the front pile and the rear pile, so that the construction difficulty is reduced.

(4) The front pile and the rear pile are made into hollow shapes, so that the weight of the slide-resistant pile is reduced while the torsion resistance of the slide-resistant pile is hardly influenced, concrete is saved, and the construction cost is reduced.

(5) Stake and back stake before can stabilizing through setting up stabilizing mean, coupling mechanism can be fixed with a horizontal pole and a connecting block connection, and sets up a push rod and a ejector pad convenience and removes the operation to the movable block.

(6) The up-down movement of the movable rod can be realized through the telescopic mechanism, the stability between the anti-slide piles can be enhanced through the reinforcing mechanism, and the connecting block III is conveniently moved through the pushing block II.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an h-shaped hollow slide-resistant pile according to an embodiment of the invention;

FIG. 2 is a side view of an h-shaped hollow slide-resistant pile according to an embodiment of the invention;

FIG. 3 is a schematic diagram of the internal structure of the stabilizing sleeve in the h-shaped hollow slide-resistant pile according to the embodiment of the invention;

FIG. 4 is a schematic structural diagram of a connecting mechanism in an h-shaped hollow slide-resistant pile according to an embodiment of the invention;

FIG. 5 is a schematic structural diagram of a first push block in the h-shaped hollow anti-slide pile according to the embodiment of the invention;

FIG. 6 is a schematic diagram of the internal structure of a front pile in the h-shaped hollow slide-resistant pile according to the embodiment of the invention;

FIG. 7 is a schematic diagram of the internal structure of a rear pile in an h-shaped hollow slide-resistant pile according to an embodiment of the invention;

FIG. 8 is a schematic structural diagram of a sliding bed in an h-shaped hollow anti-sliding pile according to an embodiment of the invention;

FIG. 9 is a schematic structural diagram of a U-shaped rod in an h-shaped hollow slide-resistant pile according to an embodiment of the invention;

FIG. 10 is a schematic structural diagram of a U-shaped rod in an h-shaped hollow slide-resistant pile according to an embodiment of the invention;

fig. 11 is a top view of a cross beam in an h-shaped hollow slide-resistant pile according to an embodiment of the invention;

fig. 12 is a schematic view of the internal structure of a second connecting sleeve in the h-shaped hollow anti-slide pile according to the embodiment of the invention.

Reference numerals:

1. front piling; 2. post-piling; 3. a cross beam; 4. the pile front end is one; 5. pile rear end one; 6. a first hollow hole; 7. the second front end of the pile; 8. a second pile rear end; 9. a hollow hole II; 10. a front pile projection; 11. a rear pile projection; 12. a slide belt; 13. sliding the bed; 14. a slider; 15. reinforcing steel bars I; 16. reinforcing steel bars II; 17. a first connecting block; 18. a first groove; 19. a cross bar; 20. a stabilizing sleeve; 21. a second groove; 22. a first spring; 23. a movable block; 24. connecting a first connecting groove; 25. a first limiting block; 26. a first limiting groove; 27. a push rod; 28. a first opening; 29. a first push block; 30. a movable rod; 31. a first connecting rod; 32. a fixed block; 33. a moving block; 34. a second spring; 35. a second limiting block; 36. a second limiting groove; 37. a second connecting block; 38. a second connecting rod; 39. a circular ring; 40. a first connecting sleeve; 41. a U-shaped rod; 42. a second connecting sleeve; 43. a third spring; 44. connecting blocks III; 45. a bump; 46. connecting groove two; 47. a second push block; 48. and a second opening.

Detailed Description

The invention is further described with reference to the following drawings and detailed description:

the first embodiment is as follows:

referring to fig. 1-12, an h-shaped hollow anti-slide pile according to an embodiment of the present invention includes a front pile 1 and a rear pile 2, a cross beam 3 is connected between the front pile 1 and the rear pile 2, the front pile 1 includes a first pile front end 4 and a first pile rear end 5, the thickness of the first pile front end 4 exceeds the first pile rear end 5, a hollow hole 6 is disposed between the first pile front end 4 and the first pile rear end 5, the rear pile 2 includes a second pile front end 7 and a second pile rear end 8, the thickness of the second pile front end 7 is greater than the thickness of the second pile rear end 8, a hollow hole 9 is disposed between the second pile front end 7 and the second pile rear end 8, a front pile projection 10 is disposed at a position of the front pile 1 close to the cross beam 3, a rear pile projection 11 is disposed at a position of the rear pile 2 close to the cross beam 3, the front pile projection 10 and the rear pile projection 11 are both located below the cross beam 3, bottoms of the front pile 1 and the rear pile 2 penetrate through a slide belt 12 and are located in a slide bed 13, preceding stake 1 with the top of back stake 2 is located sliding body 14, the inside of preceding stake 1 has inlayed reinforcing bar 15, the inside of back stake 2 has inlayed reinforcing bar two 16, preceding stake 1 with between the back stake 2 and be located the below of crossbeam 3 is provided with stabilizing mean, the top of crossbeam 3 is provided with reinforcing mean.

Referring to fig. 1-5, the stabilizing mechanism includes a first connecting block 17, a first groove 18, a first cross bar 19 and a stabilizing sleeve 20, the first connecting block 17 is fixedly connected to the first pile rear end 5 and the second pile front end 7, the first groove 18 is formed in the top of the first connecting block 17, the cross bar 19 is arranged between the first connecting blocks 17, the port of the cross bar 19 is located in the first groove 18, the stabilizing sleeve 20 is fixedly connected to the bottom of the cross bar 19, a connecting mechanism is arranged between the first connecting block 17 and the cross bar 19, a telescopic mechanism is arranged inside the stabilizing sleeve 20, the connecting mechanism includes a second groove 21, a first spring 22, a movable block 23 and a first connecting groove 24, the second groove 21 is formed in the inner wall of the first groove 18, the inside of the second groove 21 is connected to the movable block 23 through the first spring 22, the port of the cross bar 19 is provided with a first connecting groove 24 matched with the movable block 23, the top and the bottom fixedly connected with stopper one 25 of movable block 23, the inside of two 21 recesses just is close to stopper one 25 department is opened there is spacing groove one 26, stopper one 25 is located in spacing groove one 26 and with spacing groove one 26 phase-match, one side fixedly connected with push rod 27 of movable block 23, open one side of two 21 recesses has opening one 28, push rod 27 is kept away from the one end of movable block 23 is run through opening one 28 and with ejector pad one 29 fixed connection, through setting up preceding stake 1 and back stake 2 that stabilizing mean can stabilize, coupling mechanism can be connected with connecting block one 17 fixedly with horizontal pole 19, and sets up push rod 27 and ejector pad one 29 and conveniently removes the operation to movable block 23.

Referring to fig. 1-5, the telescopic mechanism includes a movable rod 30, a first connecting rod 31, a fixed block 32, a movable block 33 and a second spring 34, the movable rod 30 is disposed inside the fixing sleeve 20, the movable rod 30 is matched with the inside of the fixing sleeve 20, the top of the movable rod 30 is fixedly connected with the first connecting rod 31, the top end of the first connecting rod 31 is fixedly connected with the movable block 33, the inside of the fixing sleeve 20 is fixedly connected with the fixed block 32, the first connecting rod 31 penetrates through the fixed block 32, the second spring 34 is connected between the fixed block 32 and the movable block 33, the second spring 34 is wound on the outer surface of the first connecting rod 31, one side of the movable rod 30 is fixedly connected with the second limiting block 35, a second limiting groove 36 is formed at a position of the fixing sleeve 20 close to the second limiting block 35, the second limiting block 35 is located in the second limiting groove 36 and matched with the second limiting groove 36, be connected with two connecting blocks 37 between the two 35 of stopper, two 37 top fixedly connected with connecting rod 38 of connecting block, two 38 top fixedly connected with rings 39 of connecting rod can realize reciprocating of movable rod 30 through telescopic machanism.

Referring to fig. 1 to 12, the reinforcing mechanism includes a first connecting sleeve 40, a U-shaped rod 41, a second connecting sleeve 42, a third spring 43, a third connecting block 44, a protrusion 45 and a second connecting groove 46, the top of the beam 3 is fixedly connected with the two first connecting sleeves 40, the second connecting sleeve 42 is connected between the first connecting sleeves 40, the inside of the second connecting sleeve 42 is connected with the third connecting block 44 through the third spring 43, the protrusion 45 is fixedly connected to one side of the third connecting block 44 away from the third spring 43, a port of the protrusion 45 penetrates through the first connecting sleeve 40 and is located inside the first connecting sleeve 40, the U-shaped rod 41 is arranged between the two beams 3, a port of the U-shaped rod 41 is located inside the first connecting sleeve 40, a side wall of the U-shaped rod 41 is provided with the second connecting groove 46 matched with the protrusion 45, and the bottom of the third connecting block 44 is fixedly connected with the second pushing block 47, the bottom of the second connecting sleeve 42 is close to the second pushing block 47, an opening II 48 is formed in the position of the second pushing block 47, the port of the second pushing block 47 penetrates through the opening II 48 and is located on the outer side of the opening II 48, the reinforcing mechanism can strengthen the stability between the anti-slide piles, and the third connecting block 44 is convenient to move through the second pushing block 47.

Example two:

referring to fig. 6-7, the included angles between the first pile front end 4 and the first hollow hole 6 are both 50-60 °, and the included angles between the second pile front end 7 and the second hollow hole 9 are both 50-60 °.

For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.

In practical application, the pile position of the front pile 1 is determined, an excavator and a rock drill are used for excavating a rock-soil body to form an isosceles trapezoid, water in a hole is continuously pumped out by a water pump in the hole excavating process, the bottom of the hole is clean and clean so as to avoid influencing the construction of the pile, the bottom of the front pile is respectively penetrated through a sliding body 14 and a sliding belt 12 and finally extends into a sliding bed 13, and the front pile is hammered to a preset elevation to stop the construction of the front pile 1;

determining the pile position of a rear pile 2, excavating a rock-soil body to form an isosceles trapezoid by using an excavator and a rock drill, continuously pumping water in a hole by using a water pump in the hole excavating process, ensuring that the hole bottom is clean and clean so as to avoid influencing the construction of the pile, respectively penetrating a sliding body 14 and a sliding belt 12 at the bottom of the rear pile 2, finally extending into a sliding bed 13, hammering to a preset elevation, ensuring that a front pile bump 10 and a rear pile bump 11 are on the same horizontal plane, and stopping the construction of the rear pile 2;

manually excavating, namely excavating the sliding body 14 of the part of the cross beam 3, initially placing the cross rod 19 on the first connecting block 17, initially extruding the movable block 23 into the second groove 21, after the cross rod 19 completely enters the first groove 18, extruding the movable block 23 by the first spring 22 into the first connecting groove 24, connecting two ends of the cross rod 19 to the front pile 1 and the rear pile 2, and then downwards moving the second connecting block 37 through the circular ring 39, so that the bottom end of the movable rod 30 is positioned outside the stabilizing sleeve 20 and inserted into the sliding bed 13, and accurately placing the cross beam 3 on the front pile bump 10 and the rear pile bump 11;

then the second pushing block 47 is pushed inwards, so that the lug 45 enters the second connecting sleeve 42, the port of the U-shaped rod 41 is placed into the first connecting sleeve 40, then the second pushing block 47 is released, the port of the lug 45 enters the first connecting sleeve 40 and enters the second connecting groove 46 of the U-shaped rod 41 under the pushing of the third spring 43, at the moment, the U-shaped rod 41 can stabilize two slide-resistant piles, and then excavated soil is backfilled.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An h-shaped hollow anti-slide pile is characterized by comprising a front pile (1) and a rear pile (2), wherein a cross beam (3) is connected between the front pile (1) and the rear pile (2), the front pile (1) comprises a first pile front end (4) and a first pile rear end (5), a first hollow hole (6) is arranged between the first pile front end (4) and the first pile rear end (5), the rear pile (2) comprises a second pile front end (7) and a second pile rear end (8), a second hollow hole (9) is arranged between the second pile front end (7) and the second pile rear end (8), a front pile convex block (10) is arranged at a position where the front pile (1) is close to the cross beam (3), a rear pile convex block (11) is arranged at a position where the rear pile (2) is close to the cross beam (3), and the front pile convex block (10) and the rear pile convex block (11) are both located below the cross beam (3), the bottom of preceding stake (1) and back stake (2) runs through sliding belt (12) and is located slide bed (13), preceding stake (1) with the top of back stake (2) is located gliding mass (14), reinforcing bar (15) have been inlayed to the inside of preceding stake (1), reinforcing bar (16) have been inlayed to the inside of back stake (2), preceding stake (1) with be located between back stake (2) and the below of crossbeam (3) is provided with stabilizing mean, the top of crossbeam (3) is provided with reinforcing means, stabilizing mean includes connecting block (17), recess (18), horizontal pole (19) and firm cover (20), stake rear end (5) with on stake front end two (7) fixedly connected with connecting block (17), the top of connecting block (17) is opened flutedly (18), be equipped with horizontal pole (19) between connecting block (17) and the port of horizontal pole (19) is located recess (18), the bottom of the cross rod (19) is fixedly connected with a stabilizing sleeve (20), a connecting mechanism is arranged between the first connecting block (17) and the cross rod (19), a telescopic mechanism is arranged inside the stabilizing sleeve (20), the connecting mechanism comprises a second groove (21), a first spring (22), a movable block (23) and a first connecting groove (24), the inner wall of the first groove (18) is provided with the second groove (21), the inside of the second groove (21) is connected with the movable block (23) through the first spring (22), the port of the cross rod (19) is provided with the first connecting groove (24) matched with the movable block (23), the top and the bottom of the movable block (23) are fixedly connected with a first limiting block (25), the inside of the second groove (21) is provided with a first limiting groove (26) close to the first limiting block (25), and the first limiting block (25) is positioned in the first limiting groove (26) and matched with the first limiting groove (26), a push rod (27) is fixedly connected to one side of the movable block (23), a first opening (28) is formed in one side of the second groove (21), one end, far away from the movable block (23), of the push rod (27) penetrates through the first opening (28) and is fixedly connected with the first push block (29), the telescopic mechanism comprises a movable rod (30), a first connecting rod (31), a fixed block (32), a movable block (33) and a second spring (34), the movable rod (30) is arranged inside the stabilizing sleeve (20), the movable rod (30) is matched with the inside of the stabilizing sleeve (20), the top of the movable rod (30) is fixedly connected with the first connecting rod (31), the top end of the first connecting rod (31) is fixedly connected with the movable block (33), the fixed block (32) is fixedly connected inside the stabilizing sleeve (20), and the first connecting rod (31) penetrates through the fixed block (32), a second spring (34) is connected between the fixing block (32) and the moving block (33), the second spring (34) is wound on the outer surface of the first connecting rod (31), a second limiting block (35) is fixedly connected to one side of the moving rod (30), a second limiting groove (36) is formed in the position, close to the second limiting block (35), of the fixing sleeve (20), the second limiting block (35) is located in the second limiting groove (36) and matched with the second limiting groove (36), a second connecting block (37) is connected between the second limiting blocks (35), a second connecting rod (38) is fixedly connected to the top of the second connecting block (37), a circular ring (39) is fixedly connected to the top of the second connecting rod (38), and the reinforcing mechanism comprises a first connecting sleeve (40), a U-shaped rod (41), a second connecting sleeve (42), a third spring (43), a third connecting block (44), The connecting device comprises a convex block (45) and a second connecting groove (46), the top of each beam (3) is fixedly connected with two first connecting sleeves (40), a second connecting sleeve (42) is connected between the first connecting sleeves (40), the inside of the second connecting sleeve (42) is connected with a third connecting block (44) through a third spring (43), the third connecting block (44) is far away from the convex block (45) fixedly connected with one side of the third spring (43), the port of the convex block (45) penetrates through the first connecting sleeves (40) and is located in the first connecting sleeves (40), a U-shaped rod (41) is arranged between the two beams (3), the port of the U-shaped rod (41) is located in the first connecting sleeves (40), the side wall of the U-shaped rod (41) is provided with the second connecting groove (46) matched with the convex block (45), and the bottom of the third connecting block (44) is fixedly connected with a second pushing block (47), and a second opening (48) is formed at the bottom of the second connecting sleeve (42) and close to the second pushing block (47), and a port of the second pushing block (47) penetrates through the second opening (48) and is positioned on the outer side of the second opening (48).

2. An h-shaped hollow slide-resistant pile according to claim 1, characterized in that the included angles of the first pile front end (4) and the first hollow hole (6) are both 50-60 degrees, and the included angles of the second pile front end (7) and the second hollow hole (9) are both 50-60 degrees.