A recyclable prefabricated pile structure and its production method and construction method

Abstract

The present invention provides a recyclable prefabricated pile structure and its production method and construction method, including a concrete pile body, an anchoring workpiece and a non-bonding portion; the concrete pile body includes an anchoring plate, main bars and spiral stirrups; the anchoring plate is at least arranged at one end of the concrete pile body, the main bars are arranged in the non-bonding portion, the spiral stirrups are wound along the outside of the non-bonding portion to form a steel cage, the anchoring workpiece is installed on the anchoring plate, and the lower end of the anchoring workpiece is connected to one end of the main bars. The present invention constructs the prefabricated pile to a designated position, disassembles the anchoring workpiece on the anchoring plate, and takes out the main bars for recycling. The present invention can reduce the project cost and has the advantages of high bearing capacity and convenient production and construction.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to a recyclable prefabricated pile structure and a production method and a construction method thereof. Background Art

[0002] At present, the piles used for foundation treatment are mainly CFG piles, i.e. cement fly ash gravel piles, which are made of crushed stone, stone chips, sand, fly ash, cement and water, and are made by various pile-making machines. The strength grade is between C15 and C25, which is a pile type between rigid piles and flexible piles. CFG piles and inter-pile soil work together through the cushion layer to form a CFG pile composite foundation, but CFG piles are made by pouring concrete on site. Due to the many factors affecting the project site, such as weather changes, environmental impacts, manual operations, etc., the quality of piles is difficult to guarantee and the construction period is long. In order to overcome the interference of on-site factors, factory-made concrete piles are used to replace CFG piles in foundation treatment projects, such as concrete pipe piles and hollow square piles. The amount used for foundation treatment accounts for more than 25% of prefabricated piles. Although the strength of these concrete prefabricated piles is high, due to the use of high-strength prestressed steel bars and pile hoops, end plates and other steel materials at both ends of the piles, their cost is high, and there is still room for further optimization. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a recyclable prefabricated pile structure and a production method and a construction method thereof, which can reduce the project cost and have the advantages of high bearing capacity and convenient production and construction.

[0004] The technical solution of the present invention is: a recyclable prefabricated pile structure, comprising a concrete pile body, an anchoring workpiece and a non-bonding portion; the concrete pile body comprises an anchoring plate, main reinforcement and spiral stirrups;

[0005] The anchor plate is at least arranged at one end of the concrete pile body, the main reinforcement is arranged inside the non-bonded part, the spiral stirrups are wound along the outside of the non-bonded part to form a steel cage, the anchor workpiece is installed on the anchor plate, and the lower end of the anchor workpiece is connected to one end of the main reinforcement.

[0006] In the above solution, the anchoring workpiece is an anchoring bolt.

[0007] Furthermore, the anchor bolt includes a connecting end and a clamping section, the connecting end is connected to the main reinforcement, and the clamping section and the connecting end are transitioned through a conical section.

[0008] Furthermore, an auxiliary installation groove is provided on the clamping section.

[0009] Furthermore, the auxiliary installation groove is polygonal.

[0010] In the above solution, a plurality of sleeve mounting holes and tensioning holes are provided on the anchor plate, and the anchoring workpiece is installed in the sleeve mounting holes of the anchor plate.

[0011] In the above solution, the sleeve installation holes and the tensioning holes are evenly distributed along the center of the anchor plate.

[0012] In the above solution, anchor plates are provided at both ends of the concrete pile body, and the threads of the anchor bolts on the anchor plates at both ends are both counterclockwise or clockwise.

[0013] In the above solution, the non-adhesive portion is a release agent or a plastic sleeve or a plastic film.

[0014] A production method according to the recyclable prefabricated pile structure comprises the following steps:

[0015] Main reinforcement processing: processing at least one end of the main reinforcement for connection with the anchoring workpiece;

[0016] Installing the non-bonded portion: installing the non-bonded portion on the periphery of the main reinforcement;

[0017] Anchor workpiece installation: install the anchor workpiece on the anchor plate, and connect the lower end of the anchor workpiece with one end of the main reinforcement;

[0018] Steel cage production: Wrap the spiral stirrups along the outside of the non-bonded part of the main reinforcement to produce a steel cage;

[0019] Steel cage installation;

[0020] Concrete pouring and prestressing;

[0021] Curing and demoulding are performed to obtain the finished product.

[0022] In the above solution, when the anchoring workpiece is an anchor bolt, a thread is processed on at least one end of the main reinforcement for connection with the anchor bolt.

[0023] Furthermore, both ends of the main reinforcement are processed with counterclockwise or clockwise threads for connection with the anchor bolts at both ends.

[0024] A construction method according to the recyclable prefabricated pile structure comprises the following steps:

[0025] The recyclable prefabricated pile structure is constructed to a designated position, the anchoring workpiece on the anchor plate is dismantled, and the main reinforcement is taken out and recycled.

[0026] In the above scheme, when the anchoring workpiece is an anchor bolt, the anchor bolt at the upper end of the concrete pile body of the recyclable prefabricated pile structure is removed, the main reinforcement is rotated by the anchor bolt, the anchor bolt at the lower end of the concrete pile body is separated from the main reinforcement, and the main reinforcement is taken out and recycled.

[0027] The above scheme also includes the following steps:

[0028] When it is necessary to connect the piles, continue to lift another section of the recyclable prefabricated pile structure and construct it to the top of the next pile. After the pile connection is completed, continue to rotate the main reinforcement through the anchor bolts, separate the anchor bolts from the main reinforcement, and take out the main reinforcement for recycling.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the prefabricated pile connection structure of the present invention enables the steel bars in the pile to be recycled and reused after the prefabricated pile is constructed, which effectively saves the amount of steel bars used. The prefabricated pile structure of the present invention has the characteristics of simple structure, high vertical compressive bearing capacity of the pile body, low cost, and high construction efficiency, which effectively avoids the sinking of the foundation due to insufficient bearing capacity of the pile body and ensures the construction quality. The present invention provides an isolation device and a detachable anchoring workpiece on the main reinforcement, so that the pile is not bonded to the concrete during production, and the steel bars can be recycled after on-site construction. The structure, production and implementation methods of the present invention reduce the production intensity and construction intensity, and reduce the project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of a recyclable prefabricated pile according to one embodiment of the present invention.

[0031] Figure 2 It is a schematic diagram of the anchor bolt structure according to one embodiment of the present invention.

[0032] Figure 3 It is a schematic diagram of the auxiliary groove structure according to one embodiment of the present invention.

[0033] Figure 4 It is a schematic diagram of the anchor plate structure according to one embodiment of the present invention.

[0034] In the figure: 1. Concrete pile body; 2. Anchor bolt; 201. Connection end; 202. Snap-in section; 203. Conical section; 204. Auxiliary groove; 3. Non-bonded part; 4. Anchor plate; 5. Spiral stirrups; 6. Main reinforcement; 7. Sleeve installation hole; 8. Tensioning hole. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Figure 1 As shown, a preferred embodiment of the recyclable prefabricated pile structure is shown, which comprises a concrete pile body 1, an anchoring workpiece and a non-bonding portion 3; the concrete pile body 1 comprises an anchoring plate 4, a main reinforcement 6 and a spiral stirrup 5; the anchoring plate 4 is arranged at least at one end of the concrete pile body 1, the main reinforcement 6 is arranged inside the non-bonding portion 3, the spiral stirrup 5 is wound along the outside of the non-bonding portion 3 to form a steel cage, the anchoring workpiece is installed on the anchoring plate 4, and the lower end of the anchoring workpiece is connected to one end of the main reinforcement 6.

[0039] like Figure 2 As shown, the anchoring workpiece is an anchor bolt 2; the anchor bolt 2 includes a connecting end 201 and a clamping section 202, the connecting end 201 is provided with an internal thread, which is connected to the matching external thread on the main reinforcement 6, and the clamping section 202 and the connecting end 201 are transitioned through a conical section 203.

[0040] like Figure 3 As shown, the clamping section 202 is provided with an auxiliary installation groove 204 , and the auxiliary installation groove 204 is a polygon, preferably a regular hexagon.

[0041] like Figure 4As shown, the anchor plate 4 is provided with a plurality of sleeve mounting holes 7 and tensioning holes 8, and the anchoring workpiece is mounted in the sleeve mounting holes 7 of the anchor plate 4. The sleeve mounting holes 7 and tensioning holes 8 are evenly distributed along the center of the anchor plate 4.

[0042] The inner shape of the sleeve mounting hole 7 is the same as the outer shape of the anchoring workpiece. Preferably, the inner part of the sleeve mounting hole 7 is provided with an upper cylindrical section, a conical section and a lower cylindrical section from top to bottom, which respectively match the clamping section 202, the conical section 203 and the connecting end 201 of the anchor bolt 2.

[0043] Anchor plates 4 are provided at both ends of the concrete pile body 1, and the threads of the anchor bolts 2 on the anchor plates 4 at both ends are both counterclockwise or clockwise, so as to facilitate the removal of the main reinforcement 6 on site.

[0044] Preferably, the non-adhesive portion 3 is a release agent or a plastic sleeve or a plastic film.

[0045] A production method according to the recyclable prefabricated pile structure comprises the following steps:

[0046] At least one end of the main reinforcement 6 is processed for connection with the anchoring workpiece; the non-bonding portion 3 is installed on the periphery of the main reinforcement 6; the anchoring workpiece is installed on the anchoring plate 4, and the lower end of the anchoring workpiece is connected to one end of the main reinforcement 6; the spiral stirrup 5 is wrapped along the outer side of the non-bonding portion 3 of the main reinforcement 6 to make a reinforcement cage; the reinforcement cage is installed; concrete is poured and prestressed; curing and demoulding are performed to obtain the finished product.

[0047] When the anchoring workpiece is an anchor bolt 2, threads are processed on at least one end of the main reinforcement 6 for connection with the anchor bolt 2. Both ends of the main reinforcement 6 are processed with counterclockwise or clockwise threads for connection with the anchor bolts 2 at both ends.

[0048] Specifically, the production method of the recyclable prefabricated pile structure comprises the following steps:

[0049] Cutting of main reinforcement: Cut the main reinforcement according to the requirements, and its length should be at least 30mm less than the designed length. For example, when producing precast piles with a length of 10 meters, the cutting length of the main reinforcement is 9.7m.

[0050] Main reinforcement processing: Processing threads on at least one end of the main reinforcement 6, with a thread length of not less than 3 cm, for connection with the anchoring workpiece;

[0051] Install the non-bonding part: Install the non-bonding part 3 on the outside of the main reinforcement 6. The non-bonding part 3 can be an isolation agent or a plastic sleeve or a plastic film to prevent the main reinforcement 6 from bonding with the concrete, which is convenient for the later recovery of the reinforcement.

[0052] Installation of the anchoring workpiece: install the anchoring workpiece on the anchoring plate 4, and connect the lower end of the anchoring workpiece to one end of the main reinforcement 6;

[0053] Steel cage production: Place the main reinforcement 6 with the non-bonded portion 3 installed on the cage reinforcement production equipment, and wrap and tighten the spiral stirrup 5 along the outside of the non-bonded portion 3 of the main reinforcement 6;

[0054] Installation of steel cage: hoist the prepared steel cage into the concrete pile mold and seal both ends of the mold to prevent concrete from leaking and other quality problems during the centrifugal process;

[0055] Concrete pouring and prestressing: When using open-mould concrete laying, lay the concrete first and then prestress. When using pumped concrete laying, prestress the main reinforcement 6 first and then lay the concrete. The tensioning force is 0.2 to 0.4 times the ultimate tensile strength of the steel bar.

[0056] The finished product can be obtained after curing and demoulding: If higher concrete strength is required, such as C105 or above, secondary curing is carried out after demoulding.

[0057] A construction method according to the recyclable prefabricated pile structure, constructing the prefabricated pile to a designated position, disassembling the anchoring workpiece on the anchor plate 4, and taking out the main reinforcement 6, comprises the following steps:

[0058] The site is leveled and the recyclable prefabricated pile structure is stacked at the construction location as required;

[0059] Clean the end surface of the precast pile;

[0060] Use construction equipment to construct the prefabricated pile to the designated location, preferably, to a point where the top of the pile is 0.1m to 1.0m above the ground;

[0061] When the anchoring workpiece is an anchor bolt 2, an unloading tool is inserted into the installation auxiliary groove 204 of the anchor bolt 2, the anchor bolt 2 at the upper end of the concrete pile body 1 is removed, the main reinforcement 6 is rotated by the anchor bolt 2, the anchor bolt 2 at the lower end of the prefabricated pile is separated from the main reinforcement 6, and the main reinforcement 6 is taken out, thereby realizing the recovery and reuse of the main reinforcement 6;

[0062] When it is necessary to connect the piles, continue to lift another section of the precast pile and construct it to the top of the next section of the pile. After cleaning the end face, welding or mechanical connection can be used. After the pile connection is completed, continue to use the unloading tool to rotate the main reinforcement 6 through the anchor bolt 2, separate the anchor bolt 2 from the main reinforcement 6, take out the main reinforcement 6, recycle it, and continue to construct the precast pile to the designed elevation to complete the construction of the recyclable precast pile.

[0063] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0064] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A recyclable prefabricated pile structure, characterized in that: It comprises a concrete pile body (1), an anchoring workpiece and a non-bonding part (3); the concrete pile body (1) comprises an anchoring plate (4), main reinforcement (6) and spiral stirrups (5); The anchor plate (4) is arranged at least at one end of the concrete pile body (1), the main reinforcement (6) is arranged in the non-bonded part (3), the spiral stirrups (5) are wound along the outside of the non-bonded part (3) to form a steel cage, and the anchor workpiece is installed on the anchor plate (4), and the lower end of the anchor workpiece is connected to one end of the main reinforcement (6).

2. The recyclable prefabricated pile structure according to claim 1, characterized in that: The anchoring workpiece is an anchoring bolt (2).

3. The recyclable prefabricated pile structure according to claim 2, characterized in that: The anchor bolt (2) comprises a connecting end (201) and a clamping section (202), the connecting end (201) is connected to the main reinforcement (6), and the clamping section (202) and the connecting end (201) are transitioned through a conical section (203).

4. The recyclable prefabricated pile structure according to claim 3, characterized in that: The clamping section (202) is provided with an auxiliary installation groove (204).

5. The recyclable prefabricated pile structure according to claim 4, characterized in that: The auxiliary installation groove (204) is polygonal.

6. The recyclable prefabricated pile structure according to claim 1, characterized in that: The anchoring plate (4) is provided with a plurality of sleeve mounting holes (7) and tensioning holes (8), and the anchoring workpiece is mounted in the sleeve mounting hole (7) of the anchoring plate (4).

7. The recyclable prefabricated pile structure according to claim 6, characterized in that: The sleeve installation holes (7) and the tensioning holes (8) are evenly distributed along the center of the anchor plate (4).

8. The recyclable prefabricated pile structure according to claim 2, characterized in that: Anchor plates (4) are provided at both ends of the concrete pile body (1), and the threads of the anchor bolts (2) on the anchor plates (4) at both ends are both counterclockwise or clockwise.

9. The recyclable prefabricated pile structure according to claim 1, characterized in that: The non-adhesive part (3) is a release agent or a plastic sleeve or a plastic film.

10. A method for producing a recyclable prefabricated pile structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Main reinforcement processing: processing at least one end of the main reinforcement (6) for connection with an anchoring workpiece; Installing the non-bonded portion: installing the non-bonded portion (3) on the outer periphery of the main reinforcement (6); Anchoring workpiece installation: installing the anchoring workpiece on the anchoring plate (4), and connecting the lower end of the anchoring workpiece to one end of the main reinforcement (6); Steel cage production: spiral stirrups (5) are wound along the outside of the non-bonded portion (3) of the main reinforcement (6) to produce a steel cage; Steel cage installation; Concrete pouring and prestressing; Curing and demoulding are performed to obtain the finished product.

11. The method for producing a recyclable prefabricated pile structure according to claim 10, characterized in that: When the anchoring workpiece is an anchoring bolt (2), a thread is processed on at least one end of the main reinforcement (6) for connection with the anchoring bolt (2).

12. The method for producing a recyclable prefabricated pile structure according to claim 11, characterized in that: Both ends of the main reinforcement (6) are processed with counterclockwise or clockwise threads for connection with the anchor bolts (2) at both ends.

13. A construction method of the recyclable prefabricated pile structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: The recyclable prefabricated pile structure is constructed to a designated position, the anchoring workpiece on the anchoring plate (4) is dismantled, and the main reinforcement (6) is taken out and recycled.

14. The construction method of the recyclable prefabricated pile structure according to claim 13, characterized in that: When the anchoring workpiece is an anchor bolt (2), the anchor bolt (2) at the upper end of the concrete pile body (1) of the recyclable prefabricated pile structure is removed, the main reinforcement (6) is rotated by the anchor bolt (2), the anchor bolt (2) at the lower end of the concrete pile body (1) is separated from the main reinforcement (6), and the main reinforcement (6) is taken out and recycled.

15. The construction method of the recyclable prefabricated pile structure according to claim 14, characterized in that: The following steps are also included: When it is necessary to connect the piles, continue to hoist another section of the recyclable prefabricated pile structure and construct it to the top of the pile of the next section. After the pile connection is completed, continue to rotate the main reinforcement (6) through the anchor bolts (2), separate the anchor bolts (2) from the main reinforcement (6), and take out the main reinforcement (6) for recycling.

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