Anti-drag taper sleeve and PHC pile

Abstract

The utility model discloses a drag reduction taper sleeve and a PHC pile used for being installed on the PHC pile, the PHC pile comprises a pile body and a pile tip, the pile tip is fixed at one end of the pile body, the drag reduction taper sleeve is arranged on the pile tip in a sleeved mode, the small-diameter end of the drag reduction taper sleeve is fixed on the outer side wall of the pile tip, and the small-diameter end of the drag reduction taper sleeve is fixed on the outer side wall of the pile tip. The outer diameter of the large-diameter end of the drag reduction taper sleeve is equal to the outer diameter of the pile body, and the large-diameter end of the drag reduction taper sleeve is fixed to the end face, close to the pile tip, of the pile body. The resistance-reducing taper sleeve and the PHC pile have the advantages that the resistance-reducing taper sleeve is fixedly sleeved on the pile tip, steps formed at the contact position of the pile tip and the pile body can be eliminated, pile end resistance is effectively reduced, pile sinking efficiency is improved, meanwhile, due to the fact that the resistance-reducing taper sleeve can be welded with a steel pile tip at the same time in a PHC pipe pile factory, the resistance-reducing taper sleeve can be welded with the steel pile tip at the same time, and cost is reduced. And the large problem of difficulty in pile sinking can be solved with very low cost, and the method has very good universality and wide popularization and application values.

Description

Technical Field

[0001] The utility model relates to the technical field of PHC piles, in particular to a drag reduction cone sleeve and a PHC pile. Background Art

[0002] PHC piles, fully known as prestressed high-intensity concrete piles, are precast concrete members made by advanced processes.

[0003] As Figure 1 shown, for the PHC piles used in docks, in order to facilitate the pile sinking, a steel pile tip 12 of a certain length is welded to the lower end of the pile body 11 of the PHC pile 1. The pile tip 12 is in the shape of a steel barrel and is welded by the PHC pile manufacturer before the PHC pile leaves the factory.

[0004] However, since there is a step 13 formed at the contact between the pile tip 12 and the pile body 11, the existence of this step 13 will increase the resistance when the PHC pile is being driven. When sinking the PHC pile, when the soil layer is hard or encounters a sandy soil layer, it is more difficult to sink the pile, which affects the normal sinking of the PHC pile. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the above technical deficiencies, and provide a drag reduction cone sleeve and a PHC pile to solve the technical problem that the step formed at the contact between the pile tip and the PHC pile in the prior art will increase the resistance during pile driving and affect the normal sinking of the PHC pile.

[0006] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a drag reduction cone sleeve for installation on a PHC pile. The PHC pile includes a pile body and a pile tip. The pile tip is fixed to one end of the pile body. The drag reduction cone sleeve is sleeved on the pile tip. The small-diameter end of the drag reduction cone sleeve is fixed to the outer side wall of the pile tip, and the outer diameter of the large-diameter end of the drag reduction cone sleeve is equal to the outer diameter of the pile body. The large-diameter end of the drag reduction cone sleeve is fixed to the end face of the pile body close to the pile tip.

[0008] In some embodiments, the small-diameter end of the drag reduction cone sleeve is welded and fixed to the outer side wall of the pile tip, and the large-diameter end of the drag reduction cone sleeve is welded and fixed to the end face of the pile body close to the pile tip.

[0009] In some embodiments, the thickness of the drag reduction cone sleeve is 10 - 14 mm.

[0010] In some embodiments, the taper of the drag reduction cone sleeve is 3:1 - 12:1.

[0011] In some embodiments, the pile tip includes a thick-diameter portion and a thin-diameter portion, and a first resisting step is formed on the contact surface between the thick-diameter portion and the thin-diameter portion. A second resisting step that cooperates with the first resisting step is formed on the inner side wall of the small-diameter end of the drag reduction cone sleeve, and the second resisting step is used to abut against the first resisting step.

[0012] In some embodiments, the drag reduction cone sleeve further includes a locking ring, and the locking ring is sleeved on the thin-diameter portion and abuts against the drag reduction cone sleeve.

[0013] In some embodiments, the locking ring is welded to the thin-diameter portion.

[0014] In some embodiments, the outer diameter of the locking ring is equal to the minimum outer diameter of the small-diameter end of the drag reduction cone sleeve.

[0015] In some embodiments, the drag reduction cone sleeve is a steel drag reduction cone sleeve.

[0016] The present utility model also provides a PHC pile, which includes a pile body and a pile tip. The pile tip is fixed to one end of the pile body, and the drag reduction cone sleeve as described above is fixedly sleeved on the pile tip.

[0017] Compared with the prior art, the beneficial effects of the drag reduction cone sleeve and the PHC pile provided by the present utility model are as follows: by fixedly sleeving the drag reduction cone sleeve on the pile tip, the step formed at the contact between the pile tip and the pile body can be eliminated, effectively reducing the pile end resistance and improving the pile driving efficiency. At the same time, since the drag reduction cone sleeve can be welded simultaneously with the steel pile tip in the PHC pipe pile factory, the big problem of difficult pile driving can be solved at a very low cost, and it has good versatility and wide popularization and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an existing PHC pile;

[0019] Figure 2 is a schematic structural diagram of the drag reduction cone sleeve and the PHC pile provided in Embodiment 1 of the present utility model;

[0020] Figure 3 is a schematic structural diagram of the drag reduction cone sleeve and the PHC pile provided in Embodiment 2 of the present utility model;

[0021] Figure 4 is Figure 3 an exploded view of;

[0022] Description of the reference numerals: 1 - PHC pile, 11 - pile body, 12 - pile tip, 121 - thick-diameter portion, 122 - thin-diameter portion, 123 - first resisting step, 13 - step, 2 - drag reduction cone sleeve, 21 - second resisting step, 22 - locking ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] In order to solve the technical problem that the step formed at the contact between the pile tip and the pile body will increase the resistance during pile driving and affect the normal sinking of PHC piles, the present utility model provides a resistance-reducing cone sleeve and a PHC pile to reduce the resistance during pile driving of the PHC pile.

[0025] It should be noted that the resistance-reducing cone sleeve and the PHC pile described in the present utility model are used for but not limited to PHC piles, etc. For the convenience of description, in the present utility model, only the application of the resistance-reducing cone sleeve and the PHC pile to PHC piles is taken as an example for description, and the principle of applying the resistance-reducing cone sleeve and the PHC pile to other types of equipment is substantially the same as that of applying them to PHC piles, which will not be elaborated here one by one.

[0026] Embodiment 1

[0027] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the resistance-reducing cone sleeve and the PHC pile provided in Embodiment 1 of the present utility model. The resistance-reducing cone sleeve 2 is used to be installed on the PHC pile 1. The PHC pile 1 includes a pile body 11 and a pile tip 12. The pile tip 12 is fixed to one end of the pile body 11. The resistance-reducing cone sleeve 2 is sleeved on the pile tip 12. The small-diameter end of the resistance-reducing cone sleeve 2 is fixed to the outer side wall of the pile tip 12. The outer diameter of the large-diameter end of the resistance-reducing cone sleeve 2 is equal to the outer diameter of the pile body 11. The large-diameter end of the resistance-reducing cone sleeve 2 is fixed to one end face of the pile body 11 close to the pile tip 12.

[0028] By fixedly sleeving the resistance-reducing cone sleeve 2 on the pile tip 12, the present utility model can eliminate the step 13 formed at the contact between the pile tip 12 and the pile body 11, effectively reduce the pile tip resistance, improve the pile driving efficiency. At the same time, since the resistance-reducing cone sleeve 2 can be welded to the steel pile tip at the PHC pipe pile factory, the big problem of difficult pile driving can be solved with a very small cost, and it has good versatility and wide popularization and application value.

[0029] In one of the embodiments, please refer to Figure 2 , the small-diameter end of the resistance-reducing cone sleeve 2 is welded and fixed to the outer side wall of the pile tip 12, and the large-diameter end of the resistance-reducing cone sleeve 2 is welded and fixed to one end face of the pile body 11 close to the pile tip 12. It should be understood that although the main body of the pile body 11 is made of concrete, a steel collar is fixedly sleeved on the lower part of the pile body 11, and the large-diameter end of the resistance-reducing cone sleeve 2 can be welded and fixed to the steel collar.

[0030] In one of the embodiments, please refer to Figure 2 , the thickness of the drag reduction conical sleeve 2 is 10-14 mm. The taper of the drag reduction conical sleeve is 3:1-12:1.

[0031] In this embodiment, please refer to Figure 2 , the length of the pile tip 12 is generally about 1 m, and it can also be lengthened as needed. The pile tip 12 is in the shape of an inverted frustum, and it is appropriate that the lower opening diameter is 5-10 mm smaller than the upper opening diameter, which can reduce the diameter of the soil body entering the pile core and slow down the pile plug effect. After the pile tip 12 is coaxial with the PHC pile, it is welded to the end plate at the lower part of the PHC pile. The thickness of the steel plate for processing the steel pile tip is generally 10-14 mm.

[0032] The drag reduction conical sleeve 2 is in the shape of a frustum. Its large outer diameter is the same as the outer diameter of the pile body 11, and its small inner diameter is slightly larger than the outer diameter of the steel pile tip. The large end of the drag reduction conical sleeve 2 is welded to the lower end plate of the pile body 11, and the small end is welded to the outside of the steel pile tip. The taper of the drag reduction conical sleeve 2 is about 6:1.

[0033] The production and installation method of the drag reduction conical sleeve 2 in Embodiment 1 is as follows:

[0034] Step 1: Roll the pile tip 12 and the drag reduction conical sleeve 2 according to the design dimensions, and make upper and lower marks on the pile tip 12;

[0035] Step 2: According to the mark of the pile tip 12, weld the upper end of the pile tip 12 to the lower end plate of the PHC pile by automatic welding;

[0036] Step 3: Then put the drag reduction conical sleeve 2 on the steel pile tip. After the large end is connected to the end plate of the PHC pile, use the automatic welding process to weld the two connecting lines of the drag reduction conical sleeve 2 to the PHC pile end plate and to the pile tip 12 successively.

[0037] Embodiment 2

[0038] Please refer to Figure 3 and Figure 4 , Figure 3 is a schematic structural diagram of the drag reduction conical sleeve and the PHC pile provided by Embodiment 2 of the present invention, Figure 4 is Figure 3 an exploded view of. The pile tip 12 includes a thick diameter part 121 and a thin diameter part 122. A first resisting step 123 is formed at the contact surface between the thick diameter part 121 and the thin diameter part 122. A second resisting step 21 that cooperates with the first resisting step 123 is formed on the inner side wall of the small diameter end of the drag reduction conical sleeve 2. The second resisting step 21 is used to abut against the first resisting step 123.

[0039] In Embodiment 2, by providing a first blocking step 123 on the pile tip 12 and a second blocking step 21 that cooperates with the first blocking step 123 on the inner side wall of the small-diameter end of the drag reduction cone sleeve 2, the drag reduction cone sleeve 2 can be blocked by the first blocking step 123, improving the compressive capacity of the drag reduction cone sleeve. At the same time, since the sinking resistance of the drag reduction cone sleeve 2 can be offset by the first blocking step 123, the requirement for the fixing strength between the drag reduction cone sleeve 2 and the pile tip 12 can be reduced.

[0040] Please refer to Figure 3 and Figure 4 , in Embodiment 2, the drag reduction cone sleeve 2 further includes a locking ring 22. The locking ring 22 is sleeved on the thin-diameter portion 122 and abuts against the drag reduction cone sleeve 2. The drag reduction cone sleeve 2 can be locked by the locking ring 22.

[0041] Please refer to Figure 3 and Figure 4 , in Embodiment 2, the locking ring 22 is welded to the thin-diameter portion 122. The outer diameter of the locking ring 22 is equal to the minimum outer diameter of the small-diameter end of the drag reduction cone sleeve 2.

[0042] Please refer to Figure 3 and Figure 4 , in Embodiment 2, the drag reduction cone sleeve 2 is a steel drag reduction cone sleeve.

[0043] The present utility model also provides a PHC pile, including a pile body 11 and a pile tip 12. The pile tip 12 is fixed to one end of the pile body 11, and the described drag reduction cone sleeve 2 is fixedly sleeved on the pile tip 12.

[0044] In summary, by fixedly sleeving the drag reduction cone sleeve 2 on the pile tip 12, the present utility model can eliminate the step 13 formed at the contact between the pile tip 12 and the pile body 11, effectively reduce the pile tip resistance, and improve the pile driving efficiency. At the same time, since the drag reduction cone sleeve 2 can be welded simultaneously with the steel pile tip in the PHC pipe pile factory, the major problem of difficult pile driving can be solved at a very low cost, and it has good versatility and wide popularization and application value.

[0045] The above specific embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model should be included in the protection scope of the claims of the present utility model.

Claims

1. A drag reduction cone sleeve, used for installation on a PHC pile, wherein the PHC pile comprises a pile body and a pile tip, wherein the pile tip is fixed to one end of the pile body, wherein: The drag reducing cone sleeve is sleeved on the pile tip, the small diameter end of the drag reducing cone sleeve is fixed to the outer wall of the pile tip, the outer diameter of the large diameter end of the drag reducing cone sleeve is equal to the outer diameter of the pile body, and the large diameter end of the drag reducing cone sleeve is fixed to an end face of the pile body close to the pile tip.

2. The drag reducing cone sleeve according to claim 1, characterized in that: The small diameter end of the drag reducing cone sleeve is welded and fixed to the outer side wall of the pile tip, and the large diameter end of the drag reducing cone sleeve is welded and fixed to an end surface of the pile body close to the pile tip.

3. The drag reducing cone sleeve according to claim 1, characterized in that: The thickness of the drag reduction cone sleeve is 10-14 mm.

4. The drag reducing cone sleeve according to claim 1, characterized in that: The taper of the drag reduction cone sleeve is 3:1~12:

1.

5. The drag reducing cone sleeve according to claim 1, characterized in that: The pile tip includes a large diameter portion and a small diameter portion, and a first stop step is formed on the contact surface between the large diameter portion and the small diameter portion. A second stop step cooperating with the first stop step is formed on the inner side wall of the small diameter end of the drag reducing cone sleeve, and the second stop step is used to abut against the first stop step.

6. The drag reducing cone sleeve according to claim 5, characterized in that: It also includes a locking ring, which is sleeved on the thin-diameter portion and abuts against the drag-reducing cone sleeve.

7. The drag reducing cone sleeve according to claim 6, characterized in that: The locking ring is welded to the thin-diameter portion.

8. The drag reducing cone sleeve according to claim 7, characterized in that: The outer diameter of the locking ring is equal to the minimum outer diameter of the small diameter end of the drag reducing cone sleeve.

9. The drag reducing cone sleeve according to claim 1, characterized in that: The drag reducing cone sleeve is a steel drag reducing cone sleeve.

10. A PHC pile, characterized in that: The pile comprises a pile body and a pile tip, wherein the pile tip is fixed to one end of the pile body, and a drag reduction cone sleeve as claimed in any one of claims 1 to 9 is fixedly sleeved on the pile tip.

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