阅读说明：本技术 制作phc管桩桩尖的方法 (Method for manufacturing PHC tubular pile tip ) 是由 王大磊 王进 于闯 余江利 施珽 林科海 邓小金 于 2019-10-12 设计创作，主要内容包括：本发明涉及PHC管桩技术领域,提供了一种制作PHC管桩桩尖的方法,采用本发明的方法制作的PHC管桩桩尖,用于在PHC管桩下沉施工时安装在管桩底端；通过封板对PHC管桩的端头进行保护,避免土层进入管桩的内腔中,减少了管桩的断桩机率；通过将封板的中心线、桩尖主体的中心线、桩尖头部的中心线设置在同一直线上,在施打管桩的过程中,确保桩身始终保持垂直；通过设置至少三个斜撑杆,可防止管桩因孤石、硬砂层等的不均匀受力而导致桩尖跑偏；通过在斜撑杆上设置锯齿块,有利于桩尖穿透孤石、硬砂层,提高了PHC管桩在施打时对土层的穿透能力。(The invention relates to the technical field of PHC tubular piles, and provides a method for manufacturing a PHC tubular pile tip, wherein the PHC tubular pile tip manufactured by the method is used for being installed at the bottom end of a tubular pile when a PHC tubular pile is constructed in a sinking way; the end of the PHC tubular pile is protected through the sealing plate, so that a soil layer is prevented from entering an inner cavity of the tubular pile, and the pile breaking probability of the tubular pile is reduced; the central line of the sealing plate, the central line of the pile tip main body and the central line of the pile tip head are arranged on the same straight line, so that the pile body is ensured to be always vertical in the process of driving the tubular pile; by arranging at least three inclined support rods, the deviation of a pile tip caused by uneven stress of a boulder, a hard sand layer and the like of the pipe pile can be prevented; the sawtooth blocks are arranged on the inclined support rods, so that the pile tips can penetrate through the boulder and the hard sand layer, and the penetrating capacity of the PHC tubular pile to the soil layer during driving is improved.)

1. The method for manufacturing the PHC tubular pile tip is characterized by comprising the following steps:

s1, manufacturing a disc-shaped sealing plate (1) with the diameter of D1, a cylindrical pile tip main body (2) with the outer diameter of D2, a conical pile tip head (3), at least three elongated inclined supporting rods (4) and a plurality of sawtooth blocks (5); wherein D2 is less than D1;

s2, fixedly connecting the pile tip head (3) with one end of the pile tip main body (2), fixedly connecting the sealing plate (1) with the other end of the pile tip main body (2), and ensuring that the center line of the sealing plate (1), the center line of the pile tip main body (2) and the center line of the pile tip head (3) are positioned on the same straight line;

s3, fixing at least two sawtooth blocks (5) on each inclined strut (4) at intervals along the length direction of the inclined strut;

s4, at least three diagonal braces (4) are evenly distributed on the periphery of the pile tip main body (2) in the circumferential direction, one ends of the diagonal braces (4) are fixedly connected with the pile tip main body (2), and the other ends of the diagonal braces (4) are fixedly connected with the sealing plate (1).

2. The method for manufacturing the pile tip of the PHC pile according to the claim 1, wherein in the step S1, the method further comprises manufacturing reinforcing members (6), wherein the number of the reinforcing members (6) is equal to the number of the inclined supporting rods (4);

in step S3, the method further includes uniformly fixing the reinforcing members (6) on the sealing plate (1) circumferentially around the main body (2) of the pile tip;

in step S4, the other end of the diagonal brace (4) is connected to the sealing plate (1) via a reinforcement (6).

3. The method for manufacturing the tip of a PHC pile according to claim 2, wherein the reinforcing member (6) is an elongated structure, and in step S3, the length direction of the reinforcing member (6) is arranged along the radial direction of the sealing plate (1).

4. The method of claim 3, further comprising fixedly connecting one end of the reinforcement member (6) to the outer surface of the pile tip main body (2) in step S3.

5. The method of claim 4, wherein in step S1, after the sealing plate (1) is manufactured, the positioning cylinder (7) made of a ring of steel strip is fixed on the outer circumferential surface of the sealing plate (1), and the center line of the positioning cylinder (7) and the center line of the sealing plate (1) are aligned.

6. The method of claim 5, further comprising fixedly connecting the other end of the reinforcing member (6) to the inner surface of the positioning cylinder (7) in step S3.

7. The method for manufacturing the PHC tubular pile tip as recited in claim 6, wherein the surface of the sealing plate (1) without the tip main body (2) is flush with the end surface of the positioning cylinder (7).

8. The method for manufacturing the PHC tubular pile tip as recited in any one of claims 1 to 7, wherein the included angle between the inclined strut (4) and the pile tip main body (2) is α, wherein α is more than or equal to 10 ° and less than or equal to 80 °.

9. The method for manufacturing the PHC tubular pile tip as claimed in any one of claims 1 to 7, wherein the sealing plate (1), the pile tip main body (2), the pile tip head (3), the inclined stay bar (4) and the sawtooth block (5) are all made of steel.

Technical Field

The invention relates to the technical field of PHC tubular piles, in particular to a method for manufacturing a PHC tubular pile tip.

Background

At present, PHC tubular piles are more and more generally applied to the fields of house buildings, large public buildings, hydraulic engineering buildings and the like due to the advantages of high strength, simplicity and convenience in construction, great reduction in construction period and the like. The PHC pipe pile body concrete has high strength, can be driven into a compact sand layer and a strong weathered rock layer, and has the advantages that the bearing capacity of the bottom end of the pipe pile can be improved by 70-80 percent compared with the original soil quality and the side surface frictional resistance of the pipe pile is improved by 20-40 percent due to the extrusion effect. With the wider application of the PHC tubular pile, some practical construction problems are shown. In some soil layers, due to the local existence of boulders, hard sand layers and the like, the PHC tubular pile is very difficult to drive into the ground, and the PHC tubular pile can be deviated in the sinking process, so that the pile head can be damaged even by serious people.

Therefore, in order to avoid damage of the PHC tubular pile in the sinking process, a method commonly adopted at present is to install a conical pile tip at the bottom end of the PHC tubular pile to reduce the pile breaking probability, but the existing conical pile tip still has the condition of insufficient penetrating power in the use process; and under the condition that boulders, hard sand layers and the like exist locally in the soil layer, the PHC tubular pile still can be deviated in the sinking process.

Disclosure of Invention

The invention aims to provide a method for manufacturing a PHC tubular pile tip, and the PHC tubular pile tip manufactured by the method can be used for enhancing the penetration capability of a PHC tubular pile to a soil layer during driving.

The technical scheme adopted by the invention for solving the technical problems is as follows: the method for manufacturing the PHC tubular pile tip comprises the following steps:

s1, manufacturing a disc-shaped sealing plate with the diameter of D1, manufacturing a cylindrical pile tip main body with the outer diameter of D2, manufacturing a conical pile tip head, manufacturing at least three elongated inclined supporting rods and manufacturing a plurality of sawtooth blocks; wherein D2 is less than D1;

s2, fixedly connecting the pile tip head with one end of the pile tip main body, fixedly connecting the sealing plate with the other end of the pile tip main body, and ensuring that the center line of the sealing plate, the center line of the pile tip main body and the center line of the pile tip head are positioned on the same straight line;

s3, fixing at least two sawtooth blocks on each inclined strut at intervals along the length direction of the inclined strut;

and S4, uniformly distributing at least three inclined supporting rods around the pile tip main body, fixedly connecting one ends of the inclined supporting rods with the pile tip main body, and fixedly connecting the other ends of the inclined supporting rods with the sealing plate.

Further, in step S1, manufacturing reinforcing members, where the number of the reinforcing members is equal to the number of the diagonal braces; in step S3, the method further includes uniformly fixing the reinforcing members on the sealing plate around the main body of the pile tip; in step S4, the other end of the diagonal brace is connected to the closing plate via a reinforcement.

Further, the reinforcing member has a strip-shaped structure, and in step S3, the length direction of the reinforcing member is arranged along the radial direction of the sealing plate.

Further, in step S3, the method further includes fixedly connecting one end of the reinforcing member to the outer surface of the pile tip body.

Further, in step S1, after the sealing plate is manufactured, a positioning cylinder made of a single steel band is fixed to the outer circumferential surface of the sealing plate, and the center line of the positioning cylinder and the center line of the sealing plate are aligned.

Further, in step S3, the method further includes fixedly connecting the other end of the reinforcing member to the inner surface of the positioning cylinder.

Furthermore, the surface of the seal plate, on which the pile tip main body is not arranged, is flush with the end surface of the positioning cylinder.

Furthermore, an included angle between the inclined strut and the pile toe main body is alpha, wherein the alpha is more than or equal to 10 degrees and less than or equal to 80 degrees.

Furthermore, the sealing plate, the pile tip main body, the pile tip head, the inclined stay bar and the sawtooth block are all made of steel.

The invention has the beneficial effects that: the PHC tubular pile tip manufactured by the method is used for being installed at the bottom end of a tubular pile when the PHC tubular pile is constructed in a sinking way; the end of the PHC tubular pile is protected through the sealing plate, so that a soil layer is prevented from entering an inner cavity of the tubular pile, and the pile breaking probability of the tubular pile is reduced; the central line of the sealing plate, the central line of the pile tip main body and the central line of the pile tip head are arranged on the same straight line, so that the pile body is ensured to be always vertical in the process of driving the tubular pile; by arranging at least three inclined support rods, the deviation of a pile tip caused by uneven stress of a boulder, a hard sand layer and the like of the pipe pile can be prevented; the sawtooth blocks are arranged on the inclined support rods, so that the pile tips can penetrate through the boulder and the hard sand layer, and the penetrating capacity of the PHC tubular pile to the soil layer during driving is improved.

Drawings

Fig. 1 is a perspective view of a PHC pile tip of the present invention;

fig. 2 is a schematic structural view of a PHC pile tip of the present invention;

FIG. 3 is a top view of FIG. 2;

fig. 4 is a schematic view showing a structure of the PHC pile after the tip of the PHC pile is connected to the PHC pile.

The reference numbers in the figures are: the method comprises the following steps of 1-sealing plate, 2-pile tip main body, 3-pile tip head, 4-diagonal brace rod, 5-sawtooth block, 6-reinforcing piece, 7-positioning cylinder and 8-PHC tubular pile.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

The method for manufacturing the PHC tubular pile tip comprises the following steps:

s1, manufacturing a disc-shaped sealing plate 1 with the diameter of D1, manufacturing a cylindrical pile tip main body 2 with the outer diameter of D2, manufacturing a conical pile tip head 3, manufacturing at least three elongated inclined supporting rods 4 and manufacturing a plurality of sawtooth blocks 5; wherein D2 is less than D1;

s2, fixedly connecting the pile tip head 3 with one end of the pile tip main body 2, fixedly connecting the sealing plate 1 with the other end of the pile tip main body 2, and ensuring that the center line of the sealing plate 1, the center line of the pile tip main body 2 and the center line of the pile tip head 3 are positioned on the same straight line;

s3, fixing at least two sawtooth blocks 5 on each inclined strut 4 at intervals along the length direction of the inclined strut;

and S4, at least three diagonal braces 4 are uniformly distributed on the periphery of the pile tip main body 2 in a circumferential manner, one ends of the diagonal braces 4 are fixedly connected with the pile tip main body 2, and the other ends of the diagonal braces 4 are fixedly connected with the sealing plate 1.

In this embodiment, the sealing plate 1, the pile tip main body 2, the pile tip head 3, the diagonal brace 4, and the sawtooth block 5 are all made of steel. The PHC tubular pile tip manufactured by the method of the embodiment of the invention is used for being installed at the bottom end of the tubular pile when the PHC tubular pile 8 is sunk for construction, plays a role in guiding and plugging, can balance the bearing stress of the bottom end of the tubular pile, avoids the tubular pile from being damaged due to overlarge local stress, can enhance the penetrating power of the PHC tubular pile 8 to a soil layer when being driven, ensures the verticality of a pile body, and reduces the probability of pile breakage.

Specifically, as shown in fig. 1 to 3, the sealing plate 1 has a circular disc shape, and may be made of a steel plate. The effect of shrouding 1 is the opening that is used for shutoff PHC tubular pile 8 bottom, during the use, fixes shrouding 1 in PHC tubular pile 8's bottom, and when PHC tubular pile 8 at the sunken in-process, through shrouding 1's the effect that blocks, during avoiding the soil layer to get into PHC tubular pile 8's inner chamber, reduced PHC tubular pile 8's disconnected stake probability.

As shown in fig. 1 and 2, the pile tip main body 2 is a cylindrical structure, and may be made of round steel or steel pipe. The pile toe head 3 is of a conical structure and can be machined by round steel or steel plates. In step S2, the toe head 3 is welded to one end of the toe body 2, and the outer diameter of the toe head 3 at the connection position with the toe body 2 is equal to the outer diameter of the toe body 2; the other end of stake point main part 2 welds on shrouding 1's surface, and makes shrouding 1's central line, the central line of stake point main part 2 and the central line of stake point main part 2 be located same straight line, like this at the sunken in-process of PHC tubular pile 8, can ensure that the pile body remains the verticality throughout.

As shown in fig. 1 to 3, the diagonal brace 4 may be made of a steel section or a steel plate. One end of each diagonal brace 4 is welded on the surface of the sealing plate 1, and the other end of each diagonal brace 4 is welded on the outer surface of the pile tip main body 2; preferably, as shown in fig. 2, for the same diagonal brace 4, one end of the diagonal brace 4 is welded on the surface of the sealing plate 1 and is close to the edge of the surface of the sealing plate 1, and the other end of the diagonal brace 4 is welded on the outer surface of the pointed main body 2 and is close to the connection position of the pointed main body 2 and the pointed head 3. The included angle between the inclined strut 4 and the pile toe main body 2 is alpha, wherein alpha is more than or equal to 10 degrees and less than or equal to 80 degrees; preferably, 30 DEG-alpha is 50 deg. Through setting up diagonal brace 4, at first increased the intensity and the rigidity of PHC tubular pile stake point, secondly at the sunken in-process of PHC tubular pile 8, play the positioning action, prevent that the tubular pile from leading to the stake point off tracking because of the inhomogeneous atress of boulder, hard sand bed etc..

As shown in fig. 1 to 3, at least two sawtooth blocks 5 are arranged on each diagonal strut 4 at intervals along the length direction thereof. The sawtooth block 5 can be made of steel, and after the sawtooth block 5 is made, the sawtooth block is welded on the inclined stay bar 4. The sawtooth block 5 is arranged, so that the pile tip can penetrate through the boulder and the hard sand layer; after the pile tip is installed to the bottom end of the tubular pile, the penetrating capability of the PHC tubular pile 8 to the soil layer during driving can be improved.

In order to further improve the strength and rigidity of the sealing plate 1, as a preferable scheme, in step S1, manufacturing reinforcing pieces 6, wherein the number of the reinforcing pieces 6 is equal to the number of the inclined supporting rods 4; in step S3, the method further includes uniformly fixing the reinforcing members 6 on the sealing plate 1 around the main body 2 of the pile tip; in step S4, the other end of the diagonal brace 4 is connected to the closing plate 1 via the reinforcement 6. As shown in fig. 1 and 2, the reinforcing member 6 may be made of a steel bar, a steel plate, a flat steel, etc., the reinforcing member 6 is welded on the surface of the sealing plate 1, so as to reinforce the sealing plate 1, the end of the diagonal brace 4 is welded on the reinforcing member 6, and the diagonal brace 4 is connected with the sealing plate 1 through the reinforcing member 6.

Further, the reinforcing member 6 has a long bar-shaped structure, and in step S3, the reinforcing member 6 is disposed along the radial direction of the sealing plate 1 in the longitudinal direction. In step S3, the method further includes fixedly connecting one end of the reinforcing member 6 to the outer surface of the pile tip body 2. As shown in fig. 1 and 2, one end of the reinforcing member 6 is welded to the outer surface of the pile tip main body 2, thereby increasing the structural strength of the pile tip.

In order to further improve the stability of the PHC pile tip during sinking, preferably, in step S1, after the sealing plate 1 is manufactured, a positioning cylinder 7 made of a circle of steel strip is fixed on the outer circumferential surface of the sealing plate 1, and the center line of the positioning cylinder 7 and the center line of the sealing plate 1 are ensured to be on the same straight line. As shown in fig. 1 to 3, the outer diameter of the positioning cylinder 7 is equal to the outer diameter of the PHC pile 8, the inner diameter of the positioning cylinder 7 is equal to the outer diameter of the sealing plate 1, and the positioning cylinder 7 plays a positioning role in the process of sinking the pile tip to prevent the pile tip from deviating. In order to further improve the strength and rigidity of the tip of the PHC pile, it is preferable that, in step S3, the other end of the reinforcing member 6 is fixedly connected to the inner surface of the positioning cylinder 7. Specifically, the other end of the reinforcing member 6 is welded to the inner surface of the positioning cylinder 7. Further, the surface of the sealing plate 1 without the pile tip main body 2 is flush with the end surface of the positioning cylinder 7. As shown in fig. 2, the upper surface of the sealing plate 1 is provided with the tip main body 2, and the lower surface of the sealing plate 1 is not provided with the tip main body 2, so that the lower surface of the sealing plate 1 is flush with the lower end surface of the tip main body 2.

After the PHC tubular pile tip is manufactured by the method of the embodiment of the present invention, the pile tip is fixed to the bottom end of the PHC tubular pile 8 as shown in fig. 4, specifically, after the sealing plate 1 is abutted to the bottom end of the PHC tubular pile 8, the positioning cylinder 7 is welded to the PHC tubular pile 8, and the center line of the pile tip main body 2 and the center line of the PHC tubular pile 8 are located on the same straight line, then the PHC tubular pile 8 can be driven by aligning the center line of the pile tip head 3 with a point on the ground, the friction force during the sinking process of the PHC tubular pile 8 is respectively transmitted to the pile tip main body 2 through the pile tip head 3, transmitted to the reinforcing member 6 through the inclined support rod 4, then transmitted to the sealing plate 1 through the pile tip main body 2 and the reinforcing member 6, and transmitted to the PHC tubular pile 8 through the sealing plate 1, and the positioning cylinder 7 plays a role in connecting the tubular pile tip and positioning.