Large-diameter thin-wall tubular pile

Abstract

The utility model discloses a large-diameter thin-wall tubular pile which comprises a sleeve, the sleeve is of a double-layer tubular structure and comprises an inner sleeve body and an outer sleeve body, the length of the inner sleeve body is larger than that of the outer sleeve body, the inner diameter of the outer sleeve body is larger than the outer diameter of the inner sleeve body, the center axis of the outer sleeve body coincides with the center axis of the inner sleeve body, and the center axis of the outer sleeve body coincides with the center axis of the inner sleeve body. A crack between the inner sleeve and the outer sleeve is provided with an annular cavity, the annular cavity can contain a reinforcing body, the reinforcing body can be solidified, the bottom face of the outer sleeve is flush with the bottom face of the inner sleeve, and the top face of the inner sleeve is higher than the top face of the outer sleeve; the reinforcing body is located between the outer casing pipe and the inner casing pipe. The inner and outer steel sleeves are stable, high-frequency vibration can be transmitted to the bottoms of the sleeves in time, the reinforcing bodies are distributed more compactly and uniformly in the sleeves through the high-frequency vibration, the quality of the reinforcing bodies can be ensured, and the engineering requirements can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation treatment, in particular to a large-diameter thin-walled cylindrical pile. Background Art

[0002] Foundation treatment is a common problem encountered during engineering construction. For the common soft soil foundation in the southeastern coastal areas of China, common treatment methods include drainage consolidation, composite foundation and pile foundation. The drainage consolidation method mainly drains water from the foundation soil through various methods, but its main disadvantages are long foundation treatment period, shallow treatment depth, large settlement after the existence of a large number of drainage channels, and huge backfilling costs after settlement. Composite foundation refers to the part of the soil in the natural foundation that is strengthened or replaced during the foundation treatment process, or reinforcing materials are set in the natural foundation. Under the action of load, the matrix and the reinforcement jointly bear the load. The commonly used composite foundation method is mainly the cement mixing pile composite foundation method, which has the advantages of mature technology and low construction difficulty; the disadvantages are slightly high cost, limited treatment depth, difficult to control construction quality, and long construction period. The advantages of traditional pile foundation reinforcement are fast construction and high reliability. However, since it does not utilize the bearing capacity of the soil and often uses prestressed piles, it is expensive and has unfavorable factors such as soil squeezing. There have even been cases of pile foundation failure due to large negative friction caused by large soil settlement.

[0003] The traditional large-diameter cast-in-place thin-walled cylindrical pile technology has the advantages of large diameter, moderate bearing capacity and good effect. However, due to the need for professional equipment, low construction efficiency, large cylindrical pile wall thickness and slightly poor economy, this technology has rarely been seen in soft foundation treatment, especially in foundation pit projects in recent years.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide a large-diameter thin-walled cylindrical pile which can save the volume of the reinforcement body.

[0006] To achieve the above-mentioned purpose, the utility model provides a large-diameter thin-walled cylindrical pile, comprising: a casing, the casing is a double-layer cylindrical structure, the casing comprises an inner casing and an outer casing, the length of the inner casing is greater than the length of the outer casing, the inner diameter of the outer casing is greater than the outer diameter of the inner casing, the outer casing coincides with the central axis of the inner casing, the gap between the inner casing and the outer casing has an annular cavity, the annular cavity can accommodate a reinforcement body, the reinforcement body can be cured, the bottom surface of the outer casing is flush with the bottom surface of the inner casing, and the top surface of the inner casing is higher than the top surface of the outer casing; and at least one layer of reinforcement body, the reinforcement body is located between the outer casing and the inner casing, and is used to connect the inner casing and the outer casing, wherein the reinforcement body comprises a plurality of ribs, and the ribs are arranged at intervals along the circumference of the casing.

[0007] In one or more embodiments, the reinforcement body is multi-layered, and the multi-layer reinforcement body is vertically distributed in the sleeve along the height direction.

[0008] In one or more embodiments, an annular reinforcement plate is further included, which is a circular plate-like structure and is arranged on the inner side of the inner sleeve. The center of the annular reinforcement plate coincides with the central axis of the outer sleeve, the outer diameter of the annular reinforcement plate is equal to the inner diameter of the inner sleeve, and the top and bottom surfaces of the annular reinforcement plate are perpendicular to the height direction of the inner sleeve.

[0009] In one or more embodiments, it also includes an annular pile shoe, which is arranged at the bottom of the casing, one end of the annular pile shoe is located between the inner casing and the outer casing, the inner diameter of the annular pile shoe matches the outer diameter of the inner casing, the outer diameter of the annular pile shoe matches the inner diameter of the outer casing, and the other end of the annular pile shoe has a sharp protrusion structure, which protrudes outside the casing.

[0010] In one or more embodiments, a steel clamping plate is further included, and the steel clamping plate is located on the top of the inner sleeve and is used to connect with a high-frequency vibration device.

[0011] In one or more embodiments, the steel clamp includes two cross-shaped steel plates of equal size, the top surface of the steel clamp is flush with the top surface of the inner sleeve, and the edge of the steel clamp is fixed to the inner wall of the inner sleeve.

[0012] In one or more embodiments, it also includes a controllable lower hopper, which is a funnel-shaped structure that is wide at the top and narrow at the bottom. The controllable lower hopper is arranged around the top of the casing, and the bottom surface of the controllable lower hopper is connected to the top surface of the outer casing. The controllable lower hopper can inject reinforcement into the annular cavity inside the casing.

[0013] In one or more embodiments, the difference between the inner diameter of the inner sleeve and the outer diameter of the outer sleeve is less than 55 mm.

[0014] In one or more embodiments, the inner sleeve and the outer sleeve are made of steel.

[0015] The utility model provides a large-diameter thin-walled cylindrical pile that can be matched with a movable high-frequency vibration device to achieve rapid sinking of the cylindrical pile. A reinforcement body is arranged between the inner tube and the outer tube of the casing, so that the reinforcement body connects the outer casing and the inner casing, and the inner casing and the outer casing form a whole, so that the inner and outer steel casings are stable, which is conducive to the timely transmission of high-frequency vibration to the bottom of the casing. When pouring the reinforcement body, the high-frequency vibration makes the distribution of the reinforcement body in the casing more dense and uniform, which can reduce the wall thickness formed by the inner diameter difference between the inner casing and the outer casing, and then reduce the volume of the required reinforcement body, save materials, and be economical and environmentally friendly. Due to the reduction of the wall thickness, the weight of the large-diameter thin-walled cylindrical pile can be reduced, and with the high-frequency vibration equipment, it is flexible to move and has high construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of a large-diameter thin-walled cylindrical pile provided in an embodiment of the utility model.

[0017] Figure 2 It is a detailed structural diagram of a large-diameter thin-walled cylindrical pile provided in an embodiment of the utility model.

[0018] Description of main reference numerals:

[0019] 1- casing, 11- inner casing, 12- outer casing, 13- annular cavity, 2- reinforcement body, 21- ribs, 3- annular reinforcement plate, 4- annular pile shoe, 5- steel splint, 6- controllable lower hopper. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0021] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0022] A large diameter thin wall pile, such as Figure 1 to Figure 2As shown, it comprises: a sleeve 1, which is a double-layer cylindrical structure, comprising an inner sleeve 11 and an outer sleeve 12, the length of the inner sleeve 11 is greater than the length of the outer sleeve 12, the inner diameter of the outer sleeve 12 is greater than the outer diameter of the inner sleeve 11, the outer sleeve 12 coincides with the central axis of the inner sleeve 11, the gap between the inner sleeve 11 and the outer sleeve 12 has an annular cavity 13, the annular cavity 13 can accommodate a reinforcement body, the reinforcement body can be cured, the bottom surface of the outer sleeve 12 is flush with the bottom surface of the inner sleeve 11, and the top surface of the inner sleeve 11 is higher than the top surface of the outer sleeve 12; and at least one layer of reinforcement body 2, the reinforcement body 2 is located between the outer sleeve 12 and the inner sleeve 11, and is used to connect the inner sleeve 11 and the outer sleeve 12, wherein the reinforcement body 2 comprises a plurality of ribs 21, and the ribs 21 are arranged at intervals along the circumference of the sleeve 1.

[0023] Specifically, the length refers to the height between the inner sleeve 11 and the outer sleeve 12. The reinforcement body includes cement paste, cement mortar, grouting material, concrete, reinforced concrete and other solid bodies; the reinforcement body 2 is arranged between the inner sleeve 11 and the outer sleeve 12. As a preferred embodiment, the reinforcement body 2 is connected to the outer sleeve 12 and the inner sleeve 11 by welding. The reinforcement body 2 can also be connected to the outer sleeve 12 and the inner sleeve 11 by non-fixed plug-in to form an ultra-thin thin-walled cavity. The axis of the inner sleeve 11 coincides with the central axis of the outer sleeve 12, and the thickness of each part of the reinforcement body 2 in the sleeve 1 is equal. The reinforcement body 2 is used to connect the inner casing 11 and the outer casing 12, so that the inner casing 11 and the outer casing 12 form a whole, so that the inner and outer steel casings are stable, which is conducive to the timely transmission of high-frequency vibration to the bottom of the casing 1. When the reinforcement body is poured, the high-frequency vibration makes the distribution of the reinforcement body in the casing 1 more dense and uniform, which can ensure the quality of the reinforcement body and meet the engineering requirements, and can reduce the volume of the required reinforcement body and the required thickness of the annular cavity 13 of the casing 1. When the reinforcement body 2 is a layer, the reinforcement body 2 is located at the top of the casing.

[0024] Specifically, the ribs 21 are arranged at intervals along the circumference of the sleeve 1, which means that there is a gap between the ribs 21 and the adjacent ribs 21, so that the poured reinforcement body 2 flows down along the inner wall of the sleeve 1 through the gaps between the ribs 21. As a preferred embodiment, the ribs 21 are evenly distributed along the circumference of the sleeve 1, that is, the distance (arc length) between two adjacent ribs 21 in the same layer is equal. As a preferred embodiment, the number of ribs 21 contained in each layer of reinforcement body 2 is equal, and the circumferential positions of the ribs 21 in each layer of reinforcement body 2 are consistent, so that the internal structure of the sleeve 1 is centrally symmetrical, the vibration of the high-frequency vibration device is transmitted more evenly, and the reliability of the sleeve 1 under vibration is increased, so that it is not easy to break.

[0025] As an optional implementation, the reinforcement body 2 is multi-layered, and the multi-layer reinforcement body 2 is vertically distributed in the sleeve 1 along the height direction.

[0026] Specifically, when the reinforcement body 2 has two layers, they are respectively located at the top and bottom of the sleeve 1. As a preferred embodiment, the reinforcement body 2 has three layers, and the three layers of reinforcement bodies 2 are respectively distributed at the top, middle, and bottom of the sleeve 1. Specifically, the top is located at the top surface of the outer sleeve 12, the bottom is close to the bottom surface of the sleeve 1, and the middle is located between the top and the bottom.

[0027] As an optional embodiment, it also includes an annular reinforcement plate 3, which is a circular plate-like structure and is arranged on the inner side of the inner sleeve 11. The center of the annular reinforcement plate 3 coincides with the central axis of the outer sleeve 12, the outer diameter of the annular reinforcement plate 3 is equal to the inner diameter of the inner sleeve 11, and the top and bottom surfaces of the annular reinforcement plate 3 are perpendicular to the height direction of the inner sleeve 11.

[0028] Specifically, the annular reinforcing plate 3 is located inside the inner sleeve 11, and the top surface of the annular reinforcing plate 3 is lower than the top surface of the inner sleeve 11. The annular reinforcing plate 3 is used to stabilize the shape of the inner sleeve 11 to prevent its deformation. As a preferred embodiment, the reinforcing plate is welded to the inner sleeve 11 to form a rigid reinforcement body. The annular reinforcing plate disposed inside the inner sleeve 11 increases the overall rigidity of the inner sleeve 11 subjected to the upper high-frequency excitation force and the ability to resist lateral horizontal deformation.

[0029] As an optional embodiment, it also includes an annular pile shoe 4, which is arranged at the bottom of the casing 1, one end of the annular pile shoe 4 is located between the inner casing 11 and the outer casing 12, the inner diameter of the annular pile shoe 4 matches the outer diameter of the inner casing 11, the outer diameter of the annular pile shoe 4 matches the inner diameter of the outer casing 12, and the other end of the annular pile shoe 4 has a sharp protrusion structure, which protrudes outside the casing 1.

[0030] Specifically, the annular pile shoe 4 enables the large-diameter thin-walled pile to sink into the foundation soil under vibration, so that a thin-walled cavity can be formed inside the casing 1, and the casing will not enter the soil to form a soil plug, which is convenient for subsequent pouring and reinforcement. The top of the annular pile shoe 4 has a sharp protrusion structure, which facilitates the rapid sinking of the casing in the foundation soil.

[0031] As an optional implementation, it also includes a steel clamping plate 5, which is located on the top of the inner sleeve 11 and is used to connect the high-frequency vibration device.

[0032] Specifically, the steel clamping plate 5 is located between the top surface of the inner sleeve 11 and the annular reinforcing plate 3, so as to facilitate the connection with a high-frequency vibration device, wherein the high-frequency vibration device includes a high-frequency vibration hammer and a high-frequency resonance-free hammer.

[0033] As an optional embodiment, the steel clamp plate 5 includes two cross-shaped equal-sized steel plates, the top surface of the steel clamp plate 5 is flush with the top surface of the inner sleeve 11 , and the edge of the steel clamp plate 5 is fixed to the inner wall of the inner sleeve 11 .

[0034] Specifically, the top surface of the steel clamping plate 5 is flush with the top surface of the inner casing 11 to save the space occupied by the large-diameter thin-walled cylindrical pile.

[0035] As an optional embodiment, it also includes a controllable lower hopper 6, which is a funnel-shaped structure that is wide at the top and narrow at the bottom. The controllable lower hopper 6 is arranged around the top of the casing 1, and the bottom surface of the controllable lower hopper 6 is connected to the top surface of the outer casing 12. The controllable lower hopper 6 can inject reinforcement into the annular cavity 13 inside the casing 1.

[0036] Specifically, the controllable lower hopper 6 is preferably a circular funnel, or a square funnel, as long as it is convenient to pour the reinforcement into the annular cavity 13 inside the casing 1. The top surface of the controllable lower hopper 6 is lower than the top surface of the inner casing 11 to prevent the reinforcement from falling into the inner casing 11 when pouring the reinforcement.

[0037] As an optional implementation, the difference between the inner diameter of the inner sleeve 11 and the outer diameter of the outer sleeve 12 is less than 55 mm.

[0038] Specifically, the wall thickness formed by the inner diameter of the inner casing 11 and the outer diameter of the outer casing 12 in the present application is at least 50 mm, which is less than the minimum wall thickness of 55 mm of the prestressed pipe piles currently on the market, and is also much less than the minimum thin wall thickness of 120 mm in the specification of large-diameter cast-in-place thin-walled cylindrical piles. In soft soil foundation treatment projects, when large-diameter cast-in-place thin-walled cylindrical piles of the same diameter can provide the same bearing capacity without considering the effects of the soil core and the ends, the volume of the reinforcement body can be saved by more than 50%, and a large amount of reinforcement bodies such as concrete and reinforced concrete can be saved.

[0039] As an optional implementation, the inner sleeve 11 and the outer sleeve 12 are made of steel.

[0040] Specifically, the use of steel makes it easier to connect the inner sleeve 11 and the outer sleeve 12 by welding using the reinforcement body 2, thereby increasing the integrity of the sleeve 1 and facilitating the conduction of high-frequency exciting force.

[0041] By adopting the above technical solution, a reinforcement body is set between the inner tube and the outer tube of the casing, so that the reinforcement body connects the outer casing and the inner casing, so that the inner casing and the outer casing form a whole, so that the inner and outer steel casings are stable, which is conducive to the timely transmission of high-frequency vibration to the bottom of the casing. When pouring the reinforcement body, the high-frequency vibration makes the distribution of the reinforcement body in the casing more dense and uniform, which can ensure the quality of the reinforcement body and meet the engineering requirements, save materials, and be economical and environmentally friendly. Due to the reduction of wall thickness, the weight of large-diameter thin-walled piles can be reduced, and with the high-frequency vibration equipment, it is flexible to move and has high construction efficiency.

[0042] Embodiment 2:

[0043] The construction steps of using this large diameter thin wall pile are as follows:

[0044] S1: Locate the center of the large diameter thin wall pile and insert the annular pile shoe into the bottom of the large diameter thin wall pile;

[0045] S2: Clamp the steel splint using a high-frequency vibration device;

[0046] S3: Start high-frequency vibration to make large-diameter thin-walled piles sink quickly;

[0047] S4: When the design elevation is reached, turn off the high-frequency vibration device;

[0048] S5: The required reinforcement can be poured into the controllable hopper in batches;

[0049] S5: Start the high-frequency vibration device again, and pour the reinforcement into the thin-wall cavity formed by the large-diameter thin-wall cylindrical pile device while lifting it.

[0050] According to the practice of multiple soft foundation reinforcement projects, the engineering personnel used high-frequency vibration equipment for the construction of combined steel pipe continuous wall (PC method pile), and the high-frequency vibration successfully drove in large-diameter thin-walled piles. The driving time of 10m large-diameter thin-walled piles was about 5 minutes, the pouring time was about 5 minutes, and the final pulling out of the large-diameter thin-walled piles was about 5 minutes. The construction time of a large-diameter thin-walled pile is about 15 minutes, and the high-frequency vibration equipment is flexible and efficient. One set of equipment can complete 20 to 25 large-diameter thin-walled piles per day. The traditional large-diameter cast-in-place thin-walled pile construction equipment is large and expensive, which is not conducive to the application of small-scale projects, nor is it conducive to the simultaneous operation of multiple equipment in projects with high construction period requirements. The use of integrated large-diameter thin-walled piles and mechanized high-frequency vibration devices can quickly and efficiently solve the difficulties in soft foundation reinforcement and achieve greater economic benefits.

[0051] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A large diameter thin-walled cylindrical pile, characterized in that: include: The sleeve is a double-layer cylindrical structure, comprising an inner sleeve and an outer sleeve, the length of the inner sleeve is greater than the length of the outer sleeve, the inner diameter of the outer sleeve is greater than the outer diameter of the inner sleeve, the central axis of the outer sleeve coincides with the central axis of the inner sleeve, the gap between the inner sleeve and the outer sleeve has an annular cavity, the annular cavity can accommodate a reinforcement body, the reinforcement body can be cured, the bottom surface of the outer sleeve is flush with the bottom surface of the inner sleeve, and the top surface of the inner sleeve is higher than the top surface of the outer sleeve; as well as At least one layer of reinforcement body is provided, and the reinforcement body is located between the outer sleeve and the inner sleeve, and is used to connect the inner sleeve and the outer sleeve, wherein the reinforcement body includes a plurality of ribs, and the ribs are arranged at intervals along the circumference of the sleeve.

2. The large-diameter thin-walled cylindrical pile according to claim 1, characterized in that: The reinforcement body is multi-layered and is vertically distributed in the sleeve along the height direction.

3. The large-diameter thin-walled cylindrical pile according to claim 1, characterized in that: It also includes an annular reinforcement plate, which is a circular plate-like structure and is arranged on the inner side of the inner sleeve. The center of the annular reinforcement plate coincides with the central axis of the outer sleeve. The outer diameter of the annular reinforcement plate is equal to the inner diameter of the inner sleeve. The top and bottom surfaces of the annular reinforcement plate are perpendicular to the height direction of the inner sleeve.

4. The large-diameter thin-walled cylindrical pile according to claim 1, characterized in that: It also includes an annular pile shoe, which is arranged at the bottom of the casing, one end of the annular pile shoe is located between the inner casing and the outer casing, the inner diameter of the annular pile shoe matches the outer diameter of the inner casing, the outer diameter of the annular pile shoe matches the inner diameter of the outer casing, and the other end of the annular pile shoe has a sharp protrusion structure, which protrudes outside the casing.

5. The large-diameter thin-walled cylindrical pile according to claim 1, characterized in that: It also includes a steel clamping plate, which is located on the top of the inner sleeve and is used for connecting the high-frequency vibration device.

6. The large-diameter thin-walled cylindrical pile according to claim 5, characterized in that: The steel clamping plate comprises two cross-shaped steel plates of equal size, the top surface of the steel clamping plate is flush with the top surface of the inner sleeve, and the edge of the steel clamping plate is fixed on the inner wall of the inner sleeve.

7. The large-diameter thin-walled cylindrical pile according to claim 1, characterized in that: It also includes a controllable lower hopper, which is a funnel-shaped structure that is wide at the top and narrow at the bottom. The controllable lower hopper is arranged around the top of the casing, and the bottom surface of the controllable lower hopper is connected to the top surface of the outer casing. The controllable lower hopper can pour the reinforcement body into the annular cavity inside the casing.

8. The large-diameter thin-walled cylindrical pile according to claim 1, characterized in that: The difference between the inner diameter of the inner sleeve and the outer diameter of the outer sleeve is less than 55 mm.

9. The large-diameter thin-walled cylindrical pile according to claim 1, characterized in that: The inner sleeve and the outer sleeve are made of steel.

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