Pile tube pile tip device for eliminating vacuum effect and static pressure machine

Abstract

The application discloses a pile pipe pile tip device and a static pressure machine capable of eliminating vacuum effect, which comprises a pile pipe and a pile tip, the bottom of the pile pipe is a tapered section with an opening gradually narrowing, the pile tip comprises an inverted conical tip and a limiting portion matched with the inner wall of the tapered section, a plurality of first air holes are formed in the top of the limiting portion downwards, the top of the inverted conical tip is connected with the bottom of the limiting portion, the limiting portion is movably arranged in the narrow opening of the tapered section, the inverted conical tip is located outside the narrow opening of the tapered section, a gap is formed between the top of the inverted conical tip and the end surface of the narrow opening of the tapered section, the gap is communicated with the first air holes, and the top of the inverted conical tip can abut against the end surface of the narrow opening of the tapered section. The application can eliminate the vacuum effect in the pile pulling process, improve the hole forming quality and efficiency, and save energy.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and particularly relates to a pile pipe pile tip device and a static pressure machine for eliminating vacuum effect. Background Art

[0002] Static pile driving is a widely used piling technique in my country. This method uses a static pile driver to press the pile pipe into the soil and then slowly pull it out to form the pile hole. This method has the advantages of being noiseless, impact-free, pollution-free, with smooth hole walls, fast construction speed, and excellent hole formation.

[0003] At present, the pile pipe and pile tip of the static press are all integrated. This mechanical structure makes it so that in actual construction, especially in clay soil conditions, the pile pipe and the soil in the hole fit tightly during the static press pile extraction process, thus forming a vacuum environment between the pile tip and the soil at the bottom of the hole, resulting in a vacuum effect. This will lead to three problems:

[0004] (1) The vacuum effect causes the hole to shrink, and the probability of soil rebound at the bottom of the hole increases, which increases the rate of poor pile formation and greatly reduces the quality of the project. Subsequently, a series of hole expansion and hole excavation work have to be carried out, resulting in an increase in project costs.

[0005] (2) The vacuum effect requires the static press to significantly increase its lifting force during the pile extraction process, which results in a lot of useless work, reduces the efficiency of the static press, and causes energy waste, which is not in line with the current green construction and environmental protection construction concepts advocated.

[0006] (3) The vacuum effect requires the static press to significantly increase its lifting force during the pile extraction process. The static press's own weight plus the lifting force during pile extraction may cause the ground around the hole to collapse and crack. In severe cases, it may even cause the hole to collapse and the static press to overturn. Summary of the Invention

[0007] In response to the problems existing in the prior art, the present invention provides a pile pipe pile tip device and a static press that eliminate the vacuum effect, which can eliminate the vacuum effect during the pile extraction process, improve the quality and efficiency of hole formation, and save energy.

[0008] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0009] A pile pipe pile tip device for eliminating vacuum effect comprises a pile pipe and a pile tip, the bottom of the pile pipe is a tapered section with a gradually narrowing opening, the pile tip comprises an inverted conical tip and a limiting portion matching the inner wall of the tapered section, a plurality of first air vents are downwardly provided on the top of the limiting portion, the top of the inverted conical tip is connected to the bottom of the limiting portion, the limiting portion is movably arranged in the constriction of the tapered section, the inverted conical tip is located outside the constriction of the tapered section, a gap is formed between the top of the inverted conical tip and the constriction end face of the tapered section, the gap is communicated with the first air vent, and the top of the inverted conical tip can abut against the constriction end face of the tapered section.

[0010] Furthermore, a baffle is connected to the inner wall of the pile pipe near the tapered section, and a second air vent is provided on the baffle, which is connected to the first air vent; an elastic member is provided between the bottom of the baffle and the top of the limiting portion, the upper end of the elastic member is connected to the bottom of the baffle, and the lower end of the elastic member is a free end and abuts against the top of the limiting portion.

[0011] Furthermore, the bottom of the baffle is connected to a limiting cylinder, and the elastic member is sleeved on the limiting cylinder.

[0012] Furthermore, the elastic member is a spring.

[0013] Furthermore, the thickness of the baffle is not less than 10 mm, and the wall thickness of the pile pipe is not less than 50 mm.

[0014] Furthermore, the aperture of the first ventilation hole is not less than 5 mm, and the aperture of the second ventilation hole is not less than 10 mm.

[0015] Furthermore, the pile pipe, the pile tip and the baffle are all made of steel.

[0016] Furthermore, the plurality of first vent holes are evenly distributed around the central axis of the limiting portion.

[0017] A static press comprises the pile pipe and pile tip device for eliminating vacuum effect.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The present invention provides a pile pipe tip device that eliminates the vacuum effect. After the static press completes the pile formation, when the pile pipe is lifted, the pile tip falls downward due to its own gravity. When the limiting portion that matches the inner wall of the tapered section is attached to the inner wall of the tapered section, a gap is formed between the top of the inverted conical tip and the constricted end face of the tapered section, that is, a gap is generated between the pile tip and the pile pipe. The space between the pile tip and the soil at the bottom of the pile hole is connected to the outside atmosphere through the gap and the first vent hole, thereby preventing the generation of a vacuum during the pile extraction process. It can be seen that the present invention can bring the following benefits:

[0020] (1) Eliminate the vacuum effect during the pile extraction process, reduce the probability of necking in the hole and soil rebound at the bottom of the hole, reduce the rate of defective piles, greatly reduce a series of subsequent work such as hole expansion and hole digging, improve work efficiency, and reduce project costs.

[0021] (2) Eliminate the vacuum effect during the pile extraction process, avoid the useless work of the static press to increase the lifting force, improve the efficiency of the static press, avoid unnecessary energy waste, and implement the construction concept of green construction and environmentally friendly construction.

[0022] (3) Eliminate the vacuum effect during the pile extraction process, avoid the static press providing lifting force to counteract the vacuum effect, greatly reduce the lifting force to be provided by the static press, avoid ground collapse, cracking, hole collapse around the hole, and even static press overturning accidents, and ensure high-quality and safe construction.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 FIG2 is a schematic diagram showing the state of the pile pipe tip of the pile pipe tip device for eliminating vacuum effect during pile pressing according to the present invention;

[0026] Figure 2 FIG2 is a schematic diagram showing the pile pipe tip state of a pile pipe tip device for eliminating vacuum effect of the present invention during pile extraction;

[0027] Figure 3 Shown is a schematic diagram of the pile tip structure of a pile pipe pile tip device for eliminating vacuum effect according to the present invention.

[0028] In the figure: 1-pile pipe; 2-pile tip; 201-inverted cone-shaped tip; 202-limiting portion; 203-first vent; 3-gap; 4-baffle; 5-elastic member; 6-second vent; 7-limiting cylinder. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] As a specific embodiment of the present invention, Figures 1 to 3 As shown, a pile pipe pile tip device for eliminating vacuum effect includes a pile pipe 1 and a pile tip 2. The bottom of the pile pipe 1 is a tapered section with a gradually narrowing opening. The pile tip 2 includes an inverted conical tip 201 and a limiting portion 202 matching the inner wall of the tapered section. The top of the limiting portion 202 is downwardly provided with a plurality of first vents 203. The top of the inverted conical tip 201 is connected to the bottom of the limiting portion 202. The limiting portion 202 is movably arranged in the constriction of the tapered section. The inverted conical tip 201 is located outside the constriction of the tapered section. A gap 3 is formed between the top of the inverted conical tip 201 and the constriction end face of the tapered section. The gap 3 is connected to the first vents 203. The top of the inverted conical tip 201 can abut against the constriction end face of the tapered section.

[0031] That is to say, the pile pipe 1 and pile tip 2 of the present invention are movable. Figure 1 As shown, when the pile is driven, the pile pipe 1 is closely attached to the top of the inverted conical tip 201 of the pile tip 2 and drills downwards by pressing the inverted conical tip 201; Figure 2 As shown, when the pile is pulled out, the pile tip 2 falls downward due to its own gravity. When it falls to the limiting portion 202 that matches the inner wall of the tapered section and adheres to the inner wall of the tapered section, a gap 3 is formed between the top of the inverted conical tip 201 and the constricted end face of the tapered section. Then, the space between the pile tip 2 and the soil at the bottom of the pile hole is connected to the outside atmosphere through the gap 3 and the first vent hole 203, thereby eliminating the vacuum effect during the pile pulling process.

[0032] In this embodiment, the tapered section at the bottom of the pile pipe 1 is in the shape of an inverted frustum. The limiting portion 202 of the pile tip 2 is in the shape of an inverted frustum. The inverted conical tip 201 and the limiting portion 202 are integrally formed to form the pile tip 2.

[0033] On the basis of the above embodiment, as a more preferred embodiment, Figure 1 and Figure 2As shown, a baffle 4 is connected to the inner wall of the pile pipe 1 near the tapered section. A second vent 6 is formed in the baffle 4, which communicates with the first vent 203. An elastic member 5 is disposed between the bottom of the baffle 4 and the top of the stopper 202. The upper end of the elastic member 5 is connected to the bottom of the baffle 4, and the lower end of the elastic member 5 is free and abuts the top of the stopper 202.

[0034] Specifically, if Figure 1 As shown, when the pile is driven, the pile pipe 1 is pressed against the top of the inverted conical tip 201 of the pile tip 2 and presses the inverted conical tip 201 to drill downward, while the elastic member 5 is compressed. Figure 2 As shown, when pulling out the pile, the pile tip 2 moves downward due to its own gravity and the elastic force of the elastic member 5. When it moves to the limit portion 202 that matches the inner wall of the tapered section and is attached to the inner wall of the tapered section, a gap 3 is formed between the top of the inverted conical tip 201 and the constricted end face of the tapered section. Then, the space between the pile tip 2 and the soil at the bottom of the pile hole is connected to the outside atmosphere through the gap 3, the first vent 203 and the second vent 6, thereby eliminating the vacuum effect during the pile pulling process.

[0035] That is to say, when pulling out the pile, the elastic force of the elastic member 5 and the deadweight of the pile tip 2 ensure that the pile tip 2 and the pile pipe 1 are quickly and reliably separated, forming a gap and eliminating the vacuum effect during the pile pulling process.

[0036] In this embodiment, the baffle 4 is welded to the inner wall of the pile pipe 1 .

[0037] On the basis of the above embodiment, as a more preferred embodiment, Figure 1 and Figure 2 As shown, the bottom of the baffle 4 is connected to the limiting cylinder 7, and the elastic member 5 is sleeved on the limiting cylinder 7. In other words, the elastic member 5 is sleeved on the limiting cylinder 7 to prevent deviation during the force application process.

[0038] In this embodiment, the limiting cylinder 7 is fixed to the baffle 4 by welding. Preferably, the elastic member 5 is a spring, and the top of the spring is fixed to the baffle 4 by welding.

[0039] As a specific embodiment of the present invention, a plurality of first vent holes 203 are evenly distributed around the central axis of the stopper 202. The number of first vent holes 203 can be set to 2 to 10 according to conventional machining practices, and are evenly, symmetrically, and continuously distributed on the stopper 202 of the pile tip. The second vent hole 6 is provided at the center of the baffle 4.

[0040] Preferably, the aperture of the first vent hole 203 is not less than 5 mm, and the aperture of the second vent hole 6 is not less than 10 mm, which effectively ensures that the gas between the pile tip 2 and the bottom soil of the hole is exchanged smoothly with the external environment, and eliminates the vacuum effect in a timely and effective manner.

[0041] In this embodiment, the pile pipe 1, pile tip 2, and baffle 4 are made of the same material: steel. Preferably, the outer diameter of the pile pipe 1 is no less than 300 mm, the wall thickness of the pile pipe 1 is no less than 50 mm, and the thickness of the baffle 4 is no less than 10 mm. Because static pile driving generates extremely high pressure, the mechanical properties of the equipment, such as strength, toughness, and wear resistance, are extremely high. Therefore, steel is used and a specific thickness is specified to ensure that the mechanical performance meets the standards and that the entire construction process is completed with high quality.

[0042] The present invention also provides a static press, which includes a pile pipe pile tip device for eliminating vacuum effect provided by the present invention.

[0043] The working principle of the pile pipe pile tip device for eliminating vacuum effect of the present invention is as follows:

[0044] (1) Determine the appropriate pile pipe diameter parameters based on the specific requirements of the project, such as geology, hydrology, and pile diameter;

[0045] (2) When the pile is driven, the pile pipe is pressed against the pile tip and drilled downwards, so the pile pipe and the pile tip fit tightly together, and the pile tip and the soil fit tightly together, and the soil inside the pile cannot enter the pile pipe;

[0046] (3) When pulling out the pile, the pile tip creates a gap with the bottom of the pile pipe due to its own gravity and the elastic force of the elastic member, so that the space between the pile tip and the soil at the bottom of the pile hole is connected to the outside atmosphere through the second air vent on the baffle and the first air vent on the limiting part of the pile tip, thereby eliminating the vacuum effect during the pile pulling process.

[0047] (4) After the piles are completed, acceptance inspection is carried out, and after passing the acceptance inspection, the next pile construction work is carried out.

[0048] The present invention can greatly reduce the lifting force of the static press during the pile pulling process, improve the energy conversion efficiency of the static press, reduce useless work, and save energy; it can also prevent the ground around the hole from cracking or even causing hole collapse due to excessive lifting force during the pile pulling process of the static press; at the same time, it can also greatly reduce the necking caused by the vacuum effect and the rebound of the soil at the bottom of the hole, thereby reducing the poor hole forming rate, reducing a series of post-processing work such as hole expansion and hole digging, and reducing the cost of the project.

[0049] In one embodiment, two second vent holes 6 are provided on the baffle 4, the thickness of the baffle 4 is 10 mm, the wall thickness of the pile pipe is 50 mm, the outer diameter of the pile pipe 1 is 300 mm, the aperture of the first vent hole is 5 mm, and the aperture of the second vent hole is 10 mm.

[0050] In another embodiment, four second vent holes 6 are provided on the baffle 4, the thickness of the baffle 4 is 20 mm, the wall thickness of the pile pipe is 60 mm, the outer diameter of the pile pipe 1 is 400 mm, the aperture of the first vent hole is 10 mm, and the aperture of the second vent hole is 20 mm.

[0051] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A pile pipe tip device for eliminating vacuum effect, characterized in that: The invention comprises a pile pipe (1) and a pile tip (2), wherein the bottom of the pile pipe (1) is a tapered section with a gradually narrowing opening, the pile tip (2) comprises an inverted conical tip (201) and a limiting portion (202) matching the inner wall of the tapered section, a plurality of first vent holes (203) are opened downward at the top of the limiting portion (202), the plurality of first vent holes (203) are evenly distributed around the central axis of the limiting portion (202), and the inverted conical tip (201) is provided with a plurality of first vent holes (203). The top portion is connected to the bottom portion of the limiting portion (202), the limiting portion (202) is movably arranged in the constriction of the tapered section, the inverted conical tip (201) is located outside the constriction of the tapered section, a gap (3) is formed between the top portion of the inverted conical tip (201) and the constriction end face of the tapered section, the gap (3) is communicated with the first vent (203), and the top portion of the inverted conical tip (201) can abut against the constriction end face of the tapered section; A baffle (4) is connected to the inner wall of the pile pipe (1) near the tapered section, and a second vent hole (6) is provided on the baffle (4), and the second vent hole (6) is communicated with the first vent hole (203); an elastic member (5) is provided between the bottom of the baffle (4) and the top of the limiting portion (202), the upper end of the elastic member (5) is connected to the bottom of the baffle (4), and the lower end of the elastic member (5) is a free end and abuts against the top of the limiting portion (202).

2. A pile pipe tip device for eliminating vacuum effect according to claim 1, characterized in that: The bottom of the baffle (4) is connected to a limiting cylinder (7), and the elastic member (5) is sleeved on the limiting cylinder (7).

3. A pile pipe tip device for eliminating vacuum effect according to claim 1, characterized in that: The elastic member (5) is a spring.

4. A pile pipe tip device for eliminating vacuum effect according to claim 1, characterized in that: The thickness of the baffle (4) is not less than 10 mm, and the wall thickness of the pile pipe (1) is not less than 50 mm.

5. The pile pipe tip device for eliminating vacuum effect according to claim 1, characterized in that: The aperture of the first ventilation hole (203) is not less than 5 mm, and the aperture of the second ventilation hole (6) is not less than 10 mm.

6. A pile pipe tip device for eliminating vacuum effect according to claim 1, characterized in that: The pile pipe (1), the pile tip (2) and the baffle (4) are all made of steel.

7. A static press, characterized in that: A pile pipe pile tip device for eliminating vacuum effect according to any one of claims 1 to 6.

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