A concrete precast pipe pile for gravel geology

Abstract

The utility model provides a kind of for pebble geology's concrete precast pipe pile, including support pipe, pile body, expandable pile tip and push rod;Pile body extends vertically, and the sliding slot of extending up and down is opened in pile body;Expandable pile tip is fixedly connected to the lower end of pile body;Push rod is slid in sliding slot, and push rod can slide up and down, and push rod slides down and makes expandable pile tip deform;Support pipe is sleeved outside pile body, and expandable pile tip is located below support pipe, and expandable pile tip is detachably connected with support pipe;Limiting plate is fixedly sleeved on the outer surface upper portion of support pipe, which can significantly increase the pile end bearing area of pile body, greatly improve pile end bearing capacity, and simultaneously make support pipe synchronously separate from the connection with expandable pile tip when expanding petal expands, so that support pipe can be quickly recycled, so that violent friction between pebble and pile body can be avoided when sinking pile, and simultaneously expand and occlude and extrude with pebble when expanding petal expands in pebble soil body, improve bearing capacity.

Description

Technical Field

[0001] This utility model relates to precast concrete pipe piles, and in particular to a type of precast concrete pipe pile used in gravelly geological formations. Background Technology

[0002] Concrete pipe piles are hollow, ring-shaped piles prefabricated in a factory using prestressing and centrifugal processes. After being transported to the construction site, they are driven into the ground by hammering, static pressure, or implantation to serve as the foundation of the building, transferring the load of the superstructure to deep, stable soil or rock layers.

[0003] Concrete pipe piles are prefabricated in factories using concrete. However, in gravelly geological conditions, the gravel will rub violently against the outer surface of the pile during driving, which may cause the concrete protective layer to fall off, the reinforcing steel to be exposed, or even the pile to break, seriously affecting the durability and integrity of the pile. Utility Model Content

[0004] In order to solve the problem of severe friction between pebbles and the outer surface of precast concrete pipe piles during pile driving in pebble geology, as described in the background art, this utility model proposes a precast concrete pipe pile for pebble geology.

[0005] The technical solution of this utility model is: it includes a support pipe, a pile body, an expandable pile tip, and a push rod; The pile extends vertically, and a sliding groove extending vertically is opened inside the pile; The expandable pile tip is fixedly connected to the lower end of the pile body; The push rod is slidably installed in the groove, and the push rod can slide up and down. The downward sliding of the push rod causes the expandable pile tip to deform. The support pipe is sleeved on the outside of the pile body, and the expandable pile tip is located below the support pipe. The expandable pile tip and the support pipe can be detachably connected. A limiting plate is fixedly fitted on the upper part of the outer surface of the support pipe.

[0006] Preferably, the expandable pile tip includes a connecting plate, multiple expansion petals, and a connecting frame. The connecting plate is located below the pile body, the connecting frame is fixedly connected to the top of the connecting plate, and the connecting frame is fixedly connected to the lower end of the pile body. The multiple expansion petals are all fixedly connected to the lower surface of the connecting plate, and the multiple expansion petals are axially arranged to form a closed conical structure. The expansion valve deforms under stress.

[0007] Preferably, the lower end of the push rod is fixedly connected to a top core, which is located inside the closed conical structure, and the top core has an inclined surface that matches the shape of the inner wall of the expansion valve.

[0008] Preferably, the lower end of the support pipe is fixedly connected to an annular connecting frame, and the inner wall of the annular connecting frame is provided with a plurality of limiting holes, which are axially arranged around the axis of the support pipe. The connecting frame has a cavity inside, and multiple sliding openings communicating with the cavity are opened on the outer surface of the connecting frame. The sliding openings are axially arranged around the axis of the pile body, and each sliding opening is slidably connected with a plug rod, which is inserted into the corresponding limiting hole. The push rod is equipped with a pressing element, which is used to press the insertion rod into the insertion hole.

[0009] Preferably, the pressing component includes a pressing block, which is an annular structure. The pressing block is fixedly sleeved on the outer surface of the pushing rod and is located in the cavity. The outer surface of the pressing block is in contact with the outer surface of the insertion rod. A clearance opening is provided on the connecting plate to allow the pressing block to slide downward. An elastic reset component is provided on the insertion rod to reset the insertion rod and disengage it from the limiting insertion hole when the pressing block slides downward.

[0010] Preferably, the elastic reset component includes a spring, and a top plate is fixedly connected to one end of the insertion rod near the top pressure block. The top plate is in contact with the outer surface of the top pressure block, and the spring is disposed between the outer surface of the top plate and the inner wall of the connecting frame. The spring is slidably sleeved on the insertion rod.

[0011] Preferably, the top of the pile body has an opening at the top, and a pressure plate is fixedly connected to the top of the push rod, which slides up and down in the clearance cavity.

[0012] The advantages of this utility model are: it can significantly increase the bearing area of ​​the pile body and pile tip, greatly improve the bearing capacity of the pile tip, and at the same time, it can make the support pipe detach from the connection with the expandable pile tip simultaneously when the expansion valve expands, so that the support pipe can be quickly recovered. It can avoid severe friction between the gravel and the pile body during pile driving, and at the same time, it can improve the bearing capacity by interlocking and squeezing the gravel with the gravel when the expansion valve expands in the gravel soil. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the main structure of Example 1; Figure 2 This is a schematic diagram of the internal cross-sectional structure of Example 1; Figure 3 for Figure 2 A schematic diagram of the bottom partial structure; Figure 4 for Figure 2 A schematic diagram of the top partial structure.

[0015] In the diagram, 1 is the support pipe, 2 is the limiting plate, 3 is the connecting plate, 4 is the expansion valve, 5 is the pile body, 6 is the pushing rod, 7 is the top core, 8 is the connecting frame, 9 is the pressure plate, 10 is the ring connecting frame, 11 is the top pressure block, 12 is the insertion rod, 13 is the spring, and 14 is the clearance cavity. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1: This example aims to propose a precast concrete pipe pile for pebble geology.

[0018] according to Figures 1-4 As shown, it includes a support pipe 1, a pile body 5, an expandable pile tip, and a push rod 6.

[0019] The pile body 5 extends vertically, and a sliding groove extending vertically is opened inside the pile body 5.

[0020] An expandable pile tip is fixedly connected to the lower end of the pile body 5. The expandable pile tip includes a connecting plate 3, multiple expansion petals 4, and a connecting frame 8. The connecting plate 3 is located below the pile body 5, and the connecting frame 8 is fixedly connected to the top of the connecting plate 3. The connecting frame 8 is fixedly connected to the lower end of the pile body 5. Specifically, the top of the connecting frame 8 is fixedly connected to an embedded part. When the concrete is poured and formed, the embedded part is embedded into the pile body 5. After the concrete structure has reached its strength, the connecting frame 8 is fixedly connected to the lower end of the pile body 5. The multiple expansion petals 4 are all fixedly connected to the lower surface of the connecting plate 3, and the multiple expansion petals 4 are axially arranged to form a closed conical structure.

[0021] The expansion petal 4 is made of high-strength alloy structural steel and the surface is hardened. In this embodiment, four expansion petals 4 are selected. The inner side of the expansion petal 4 is a slope, and the outer side of the expansion petal 4 can be set as a slope, and textures are opened on the slope to enhance the friction between it and the soil.

[0022] The push rod 6 is slidably placed in the groove. The push rod 6 slides downward to deform the expandable pile tip. The lower end of the push rod 6 is fixedly connected to the top core 7. The top core 7 is located inside the closed conical structure. The top core 7 has an inclined surface that matches the shape of the inner wall of the expansion petal 4. By striking, the push rod 6 moves downward. The top core 7 moves downward to support the expansion petal 4. The expansion petal 4 deforms and expands outward, so that the expansion petal 4 is squeezed and interlocked with the soil.

[0023] The top of the pile body 5 is provided with an upper-opening relief cavity 14. A sliding groove is opened on the bottom wall of the relief cavity 14, and the diameter of the sliding groove is smaller than the diameter of the relief cavity 14. The top of the push rod 6 is fixedly connected to a pressure plate 9. The pressure plate 9 slides up and down in the relief cavity 14. The maximum descent height of the push rod 6 is controlled by the depth of the relief cavity 14 to prevent the top core 7 from falling too deep and detaching from contact with the expansion petal 4.

[0024] The support pipe 1 is sleeved on the outside of the pile body 5. The expandable pile tip is located below the support pipe 1. The expandable pile tip is detachably connected to the support pipe 1. The lower end of the support pipe 1 is fixedly connected to an annular connecting frame 10. The inner wall of the annular connecting frame 10 is provided with multiple limiting holes, which are axially arranged around the axis of the support pipe 1.

[0025] The connecting frame 8 has a cavity inside, and multiple sliding openings communicating with the cavity are opened on the outer surface of the connecting frame 8. The sliding openings are axially arranged around the axis of the pile body 5, and each sliding opening is slidably connected with a plug rod 12, which is inserted into the corresponding limiting hole.

[0026] The top of the connecting frame 8 has a clearance opening for the push rod 6 to pass through.

[0027] The push rod 6 is provided with a top pressing component, which includes a top pressing block 11. The top pressing block 11 has a ring structure and is fixedly sleeved on the outer surface of the push rod 6. The top pressing block 11 is located in the cavity, and the outer surface of the top pressing block 11 is in contact with the outer surface of the insertion rod 12. The connecting plate 3 is provided with a clearance opening to avoid the downward sliding of the top pressing block 11. The insertion rod 12 is provided with an elastic reset component to reset the insertion rod 12 and disengage it from the limit insertion hole when the top pressing block 11 slides downward.

[0028] The elastic reset component includes a spring 13. A top plate is fixedly connected to one end of the insertion rod 12 near the top pressure block 11. The top plate is in contact with the outer surface of the top pressure block 11. The spring 13 is disposed between the outer surface of the top plate and the inner wall of the connecting frame 8. The spring 13 is slidably sleeved on the insertion rod 12.

[0029] When the push rod 6 moves downward, it causes the top pressure block 11 to move downward. The top pressure block 11 disengages from the insertion rod 12. Under the action of the elastic potential energy of the spring 13, the insertion rod 12 resets and moves towards the axis of the pile body 5, so that the insertion rod 12 disengages from the limiting insertion hole and the support pipe 1 disengages from the expandable pile tip, so that the support pipe 1 can be recovered from the soil by the hoisting device.

[0030] A limiting plate 2 is fixedly sleeved on the upper part of the outer surface of the support pipe 1. The diameter of the limiting plate 2 is larger than that of the pile hole, so as to limit the sinking depth of the support pipe 1.

[0031] Working principle: The support pipe 1 and the pile body 5 are driven into the soil. The support pipe 1 protects the pile body 5. After the pile body 5 is driven into the soil, the pressure plate 9 is hammered, causing the pressure plate 9 to slide downward in the relief cavity 14. This causes the pressure plate 9 to drive the push rod 6 to move downward. The push rod 6 moves downward against the top core 7, thereby expanding the expansion petals 4 and improving the support of the pile body 5 in the soil. Then, the support pipe 1 is lifted out of the soil and retrieved by a crane.

[0032] After this expansion, the bearing area of ​​the pile 5 is significantly increased, greatly improving the bearing capacity of the pile tip. At the same time, the support pipe 1 is simultaneously disconnected from the expandable pile tip when the expansion petal 4 expands, allowing the support pipe 1 to be quickly recovered. This avoids severe friction between the gravel and the pile 5 during pile driving. Meanwhile, the expansion petal 4 expands and interlocks with the gravel in the gravel soil, improving the bearing capacity.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A precast concrete pipe pile for use in gravelly geological formations, characterized in that: Includes support pipe (1), pile body (5), expandable pile tip and push rod (6); The pile body (5) extends vertically, and a sliding groove extending vertically is provided inside the pile body (5); The expandable pile tip is fixedly connected to the lower end of the pile body (5); The push rod (6) is slidably placed in the groove. The push rod (6) can slide up and down. The push rod (6) slides down to deform the tip of the expandable pile. The support pipe (1) is sleeved on the outside of the pile body (5), and the expandable pile tip is located below the support pipe (1). The expandable pile tip is detachably connected to the support pipe (1). A limiting plate (2) is fixedly sleeved on the upper part of the outer surface of the support pipe (1).

2. A precast concrete pipe pile for pebble geology according to claim 1, characterized in that: The expandable pile tip includes a connecting plate (3), multiple expansion petals (4) and a connecting frame (8). The connecting plate (3) is located below the pile body (5). The connecting frame (8) is fixedly connected to the top of the connecting plate (3) and fixedly connected to the lower end of the pile body (5). The multiple expansion petals (4) are all fixedly connected to the lower surface of the connecting plate (3), and the multiple expansion petals (4) are axially arranged and form a closed conical structure. The expansion lobe (4) is deformed under stress.

3. A precast concrete pipe pile for pebble geology according to claim 2, characterized in that: The lower end of the push rod (6) is fixedly connected to the top core (7), which is located inside the closed conical structure. The top core (7) has an inclined surface that matches the shape of the inner wall of the expansion petal (4).

4. A precast concrete pipe pile for gravelly geological conditions according to any one of claims 1-3, characterized in that: The lower end of the support pipe (1) is fixedly connected to an annular connecting frame (10). The inner wall of the annular connecting frame (10) is provided with multiple limiting holes, which are axially arranged around the axis of the support pipe (1). The connecting frame (8) has a cavity inside, and multiple sliding openings communicating with the cavity are opened on the outer surface of the connecting frame (8). The sliding openings are axially arranged around the axis of the pile body (5), and each sliding opening is slidably connected with a plug rod (12). The plug rod (12) is inserted into the corresponding limiting hole. The push rod (6) is provided with a pressing member, which is used to press the insert rod (12) into the insertion hole.

5. A precast concrete pipe pile for pebble geology according to claim 4, characterized in that: The top pressing component includes a top pressing block (11), which is a ring structure. The top pressing block (11) is fixedly sleeved on the outer surface of the push rod (6) and the top pressing block (11) is located in the cavity. The outer surface of the top pressing block (11) is in contact with the outer surface of the insertion rod (12). The connecting plate (3) is provided with a clearance opening, which is used to avoid the downward sliding of the top pressing block (11). The insertion rod (12) is provided with an elastic reset component, which is used to reset the insertion rod (12) and disengage it from the insertion hole when the top pressing block (11) slides downward.

6. A precast concrete pipe pile for gravelly geological conditions according to claim 5, characterized in that: The elastic reset component includes a spring (13). The end of the insert rod (12) near the top pressure block (11) is fixedly connected to a top plate. The top plate is in contact with the outer surface of the top pressure block (11). The spring (13) is located between the outer surface of the top plate and the inner wall of the connecting frame (8). The spring (13) is slidably sleeved on the insert rod (12).

7. A precast concrete pipe pile for gravelly geological conditions according to any one of claims 1-3, characterized in that: The top of the pile body (5) is provided with an upper opening relief cavity (14), and the top of the push rod (6) is fixedly connected with a pressure plate (9), which slides up and down in the relief cavity (14).

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