Prestressed concrete special-shaped solid square pile

Abstract

The utility model discloses a pre-stressed concrete special-shaped solid square pile, which relates to the technical field of building pipe piles, and comprises a pile body with an elliptical cross section and a butt joint seat which is in fast butt joint with a foundation pile, and the butt joint seat is connected with the bottom wall of an extension part in a rotary adjusting mode. The radial side wall of the guide part and the radial outer walls of the multiple butt joint blocks are in threaded connection with threaded fixing sleeves, the multiple butt joint blocks are adjusted with the extension part as the rotation center, so that the butt joint blocks and butt joint notches pre-formed in the radial side wall of the upper end of the foundation pile are oppositely distributed up and down, and the ends of the butt joint blocks slide into the butt joint notches in the upper end of the foundation pile; and the threaded retention sleeve is locked at the intersection of the guide part and the foundation pile. According to the utility model, quick clamping of multi-point connection points can be realized, and the threaded retention sleeve is locked at the intersection of the guide part and the foundation pile, so that the butt-joint block does not need to be frequently adjusted to align the orientation, and the problems that the workload of mounting a large number of bolts by workers is large, the butt-joint construction speed is relatively slow, and the construction efficiency is influenced are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of building pipe piles, in particular to a prestressed concrete special-shaped solid square pile. Background Technique

[0002] The prestressed concrete special-shaped solid square pile is a concrete foundation member made by using prestress technology. It has a special cross-sectional shape, usually concave-convex or flat-square, and belongs to a solid structure. This kind of square pile has the characteristics of high strength, high durability and earthquake resistance, etc., making it widely used in the infrastructure construction of various buildings and civil engineering projects.

[0003] The construction method of the prestressed concrete pipe pile is as follows: First, lift the prestressed concrete pipe pile foundation and place it at the designated position on the ground surface; then, use a pile driver to gradually drive the prestressed concrete pipe pile foundation into the soil layer. The upper end of the concrete pipe pile is connected to the lower end of the concrete column pile by bolts. Usually, in order to enhance the connection stability, a circle of bolt connection points is set at the connection between the lower end of the concrete pipe pile and the upper end of the foundation pipe pile. Workers need to rotate and tighten a large number of bolts, and the workload is large. Moreover, during docking, due to the large mass of the concrete pipe pile, the hoisting equipment is used for hoisting and assembling. Therefore, during the docking process of the pipe pile, it is inevitable that there will be swinging, resulting in the inability to quickly align the multi-point bolt connection points, and frequent adjustment of the alignment direction is required, resulting in a relatively slow docking construction speed and affecting the construction efficiency. Content of the Utility Model

[0004] The purpose of the utility model is to provide a prestressed concrete special-shaped solid square pile to solve the problems put forward in the above background technique.

[0005] To solve the above technical problems, the utility model provides the following technical solution: A prestressed concrete special-shaped solid square pile, including a pile body with an elliptical cross-sectional structure and a docking seat for quickly docking with the foundation pile. The bottom end of the pile body extends with an extension part. The docking seat is connected to the bottom wall of the extension part in a rotation-adjustable manner. The radial side wall of the docking seat extends beyond the radial side wall of the extension part to form a guiding part. A plurality of guiding notches are arranged along the axial direction on the radial side wall of the guiding part. A docking block flush with the outer radial wall of the guiding part is adjustably arranged in the guiding notch. A threaded retaining sleeve is threadedly connected to the radial side wall of the guiding part and the outer radial walls of a plurality of docking blocks. The threaded retaining sleeve can be threadedly connected to the radial side wall of the upper end of the foundation pile.

[0006] The docking seat is rotated and adjusted on the bottom wall of the extension part, driving multiple docking blocks to be adjusted with the extension part as the rotation center, so that the docking blocks and the pre-opened docking notches on the radial side walls of the upper end of the foundation pile are relatively distributed up and down, and the docking block is slid down along the guide notch so that the end of the docking block slides into the docking notch at the upper end of the foundation pile, and the threaded retaining sleeve is rotated downward along the axial direction of the guide part to the intersection of the guide part and the upper end of the foundation pile, and then the threaded retaining sleeve is locked at the intersection of the guide part and the foundation pile.

[0007] In a further embodiment, the radial side wall of the docking seat does not exceed the vertical plane where the radial side wall of the pile body is located, thereby ensuring that the pile body has minimal resistance when it is longitudinally placed into deep soil.

[0008] In a further embodiment, a sliding block is fixed to the side wall of the docking block, and a sliding groove for the sliding block to slide up and down is provided on the inner wall side of the guide notch.

[0009] In a further embodiment, the axial length of the docking block is at least the sum of the axial length of the guide notch and the axial length of the docking notch pre-opened in the foundation pile.

[0010] In a further embodiment, a plurality of annular grooves are provided on the radial side wall of the pile body, and an expansion piece which can be opened and retracted along the radial direction of the annular groove is provided in the annular groove. The expansion piece can rotate in the radial direction of the pile body to expand the radial space in the pile groove, thereby facilitating the injection of fixing liquid into the pile groove and enhancing the supporting strength of the inner wall of the pile groove.

[0011] In a further embodiment, the soil expansion member is two half hollow elliptical enlarged wings;

[0012] The two magnifying wings are fixed with T-shaped sliding bars on opposite side walls, the upper end of the pile body is provided with a rotating groove downwardly, a rotating rod body is rotatably arranged in the rotating groove, the radial side wall of the pile body is provided with a drawing-out opening connected with the rotating groove, the outer wall of the rotating rod body is threadedly connected with a lifting seat, and the radial side wall of the lifting seat is symmetrically provided with two guide rods, the two guide rods extend obliquely downwardly away from each other, the T-shaped sliding bar slides through the drawing-out opening and extends into the rotating groove, the end of the T-shaped sliding bar is provided with a guide hole slidably plugged with the guide rod, and the bottom wall of the T-shaped sliding bar is fixed with a limiting piece to prevent the T-shaped sliding bar from escaping from the guide hole.

[0013] In a further embodiment, the upper end of the rotating rod body is flush with the upper end of the pile body, and the upper end of the rotating rod body is recessed downward to form a multi-angular transmission groove, and a lifting lock is fixed to the inner bottom wall of the multi-angular transmission groove.

[0014] In a further embodiment, the two enlarged wings are combined and accommodated in the inner wall of the annular groove, and the outer wall of the enlarged wing is flush with the outer wall of the pile body.

[0015] In a further embodiment, two amplification wings open along the radial direction of the pile body and rotate following the pile body, capable of expanding the soil on the radial side wall in the pile groove. While the pile body rotates, it reciprocates up and down. The amplification wings lift and fall up and down while rotating on their own axes, thereby forming an annular expansion support groove with sufficient height on the radial side wall in the pile groove by means of the amplification wings.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] The present utility model is a prestressed concrete special-shaped solid square pile, which can quickly adjust the docking position between the docking block and the preset docking notch of the foundation pile during the hoisting process, realize the quick clamping of multiple connection points, and lock the threaded retaining sleeve at the intersection of the guiding part and the foundation pile, eliminating the need for frequent adjustment of the alignment of the docking block, thus solving the problems of the large workload of workers installing a large number of bolts and the relatively slow docking construction speed, which affects the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present utility model.

[0019] Figure 2 It is of Embodiment 1 of the present utility model Figure 1 The enlarged view of the structure at A in it.

[0020] Figure 3 It is of Embodiment 1 of the present utility model Figure 1 The enlarged view of the structure at B in it.

[0021] Figure 4 It is the partial structural schematic diagram of the pile body of Embodiment 1 of the present utility model.

[0022] Figure 5 It is the partial exploded view of the expansion support column and the soil expansion member of Embodiment 1 of the present utility model.

[0023] Figure 6 It is the sectional view of the assembled structure of the soil expansion member and the guide rod of Embodiment 1 of the present utility model.

[0024] Figure 7 It is the connection schematic diagram of Embodiment 1 of the present utility model.

[0025] Figure 8 It is the connection schematic diagram of the pile top and the bearing platform of Embodiment 1 of the present utility model.

[0026] Figure 9 It is the connection diagram of the pile top and the bearing platform when the pile top of Embodiment 1 of the present utility model is lower than the design elevation.

[0027] Figure 10 It is the schematic structural diagram of Embodiment 2 of the present utility model.

[0028] Figure 11 This is a schematic structural diagram of the third embodiment of the present utility model.

[0029] In the figure: 1, pile body; 11, pulling port; 2, enlarged wing; 21, T-shaped sliding rod; 3, threaded retaining sleeve; 4, docking seat; 5, docking block; 6, rotating rod body; 61, lifting lock; 62, lifting seat; 63, guide rod. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0031] Embodiment, as Figures 1 to 11 shown, this embodiment provides a prestressed concrete special-shaped solid square pile, including a pile body 1 with an elliptical cross-section structure and a docking seat 4 for quickly docking with a foundation pile. The bottom end of the pile body 1 extends with an extension part, and the docking seat 4 is connected to the bottom wall of the extension part in a rotation adjustment manner. The radial side wall of the docking seat 4 extends beyond the radial side wall of the extension part to form a guiding part. A plurality of guiding notches are arranged along the axial direction on the radial side wall of the guiding part. A docking block 5 flush with the outer radial wall of the guiding part is adjustably arranged in the guiding notch. In the prior art, a hoisting device is used to hoist the prestressed concrete special-shaped solid square pile for docking construction operations. The prestressed concrete special-shaped solid square pile is hoisted to a position above the foundation pile already embedded in the pile foundation in a relatively vertical form. The docking seat 4 can rotate freely relative to the extension part, so as to adjust the position of the docking block 5 relative to the pre-opened docking notch at the upper end of the foundation pile. Lower the prestressed concrete special-shaped solid square pile, and at the same time slide the docking block 5 down along the guiding notch to extend out of the guiding notch, and the docking block 5 can be quickly inserted into the docking notch at the upper end of the foundation pile to achieve quick docking.

[0032] The specific installation process of the prestressed concrete special-shaped solid square pile is as follows: The docking seat 4 rotates and adjusts on the bottom wall of the extension part, driving a plurality of docking blocks 5 to adjust with the extension part as the rotation center, so that the docking blocks 5 and the pre-opened docking notches on the radial side wall of the upper end of the foundation pile are distributed up and down relatively. Slide the docking blocks 5 down along the guiding notches, so that the ends of the docking blocks 5 slide into the docking notches at the upper end of the foundation pile. In order to enhance the docking stability, threaded retaining sleeves 3 are threadedly connected to the radial side walls of the guiding part and the radial outer walls of the plurality of docking blocks 5. The threaded retaining sleeves 3 can be threadedly connected to the radial side wall of the upper end of the foundation pile. Rotate the threaded retaining sleeves 3 downward along the axial direction of the guiding part to the intersection of the guiding part and the upper end of the foundation pile, and then lock the threaded retaining sleeves 3 at the intersection of the guiding part and the foundation pile. Thus, in the way of bolt connection, the prestressed concrete special-shaped solid square pile and the foundation pile in the pile groove are quickly assembled.

[0033] Change the existing bolt installation method, without the need to accurately align the bolt holes one by one, improving the construction efficiency. Adopt the way of inserting the docking blocks 5 into the pre-opened docking notches of the foundation pile. On the one hand, it can align the docking seat 4 in real time while lowering the prestressed concrete special-shaped solid square pile to adjust the position of the docking blocks 5 relative to the docking notches. There is no need to rotate the prestressed concrete special-shaped solid square pile, which takes a short time to adjust. A single person can rotate the docking seat 4 to adjust, and the adjustment speed is fast.

[0034] During the above hoisting process, quickly adjust the docking position of the docking blocks 5 and the pre-set docking notches of the foundation pile, realize the quick clamping of the connection points at multiple points, and adopt the method of locking the threaded retaining sleeves 3 at the intersection of the guiding part and the foundation pile, without the need to frequently adjust the alignment of the docking blocks 5. This solves the problems of the large workload of workers installing a large number of bolts and the relatively slow docking construction speed, which affect the construction efficiency.

[0035] Furthermore, the radial side wall of the docking seat 4 is set not to exceed the vertical plane where the radial side wall of the pile body 1 is located, ensuring the minimum resistance when the pile body 1 is longitudinally inserted into the deep soil.

[0036] Sliders are fixed on the side walls of the above-mentioned docking blocks 5, and sliding grooves for the sliders to slide up and down are opened on the inner side walls of the guiding notches. The sliders slide freely in the sliding grooves, so as to adjust the length of the docking blocks 5 extending out of the sliding grooves, that is, the length inserted into the docking notches. The axial length of the docking blocks 5 here is at least the sum of the axial lengths of the guiding notches and the pre-opened docking notches of the foundation pile. This ensures that the docking blocks 5 have enough length to be respectively placed in the guiding notches and the docking notches, so as to ensure that the strength at the intersection of the prestressed concrete special-shaped solid square pile and the foundation pile is large enough, avoiding excessive deformation at the intersection due to insufficient strength and affecting the installation stability of the prestressed concrete special-shaped solid square pile.

[0037] In this embodiment, as Figure 1As shown, a plurality of annular grooves are provided on the radial side wall of the pile body 1, and expansion pieces are provided in the annular grooves which can be opened and retracted along the radial direction of the annular grooves. The expansion pieces can rotate in the radial direction of the pile body 1 to expand the radial space in the pile groove, so as to facilitate the injection of fixing liquid into the pile groove and enhance the supporting strength of the inner wall of the pile groove.

[0038] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, specifically, the expansion piece is two half hollow elliptical enlarged wings 2, and the two enlarged wings 2 are fixed with T-shaped slide bars 21 on the opposite side walls. A rotating groove is provided downwardly at the upper end of the pile body 1, and a rotating rod body 6 is provided in the rotating groove for rotation. A pull-out opening 11 connected to the rotating groove is provided on the radial side wall of the pile body 1, and a lifting seat 62 is threadedly connected to the outer wall of the rotating rod body 6. Two guide rods 63 are symmetrically provided on the radial side wall of the lifting seat 62, and the two guide rods 63 extend downwardly and tilted away from each other. The T-shaped slide bar 21 slides through the pull-out opening 11 and extends into the rotating groove. The enlarged wing 2 can slide back and forth horizontally along the pull-out opening 11 to adjust the position relative to the annular groove, and the opening and storage operation of the enlarged wing 2 can be performed. A guide hole is provided at the end of the T-shaped slide bar 21 for sliding and plugging with the guide rod 63, and a limit plate is fixed on the bottom wall of the T-shaped slide bar 21 to prevent the T-shaped slide bar 21 from escaping from the guide hole. Rotating the rotating rod body 6 can drive the lifting seat 62 to adjust the height along the axial direction of the rotating rod body 6, and then drive the two guide rods 63 to adjust the height up and down. Figure 6 During the lifting process of the guide rod 63, the guide rod 63 can slide relative to the guide hole of the T-shaped slide bar 21, and at the same time, the T-shaped slide bar 21 can be pulled horizontally along the pull-out hole to move the enlarged wing 2 to open and store. Figure 6 The horizontal direction arrow.

[0039] In the above process, as long as the height of the guide rod 63 is adjusted upward, the inclined side wall of the guide rod 63 can be used to push the T-shaped slide bar 21 and the magnifying wing 2 to slide horizontally. The magnifying wing 2 is opened to follow the pile body 1 to rotate synchronously to expand the radial side wall soil in the pile groove, and to expand the radial space in the pile groove, so as to facilitate the injection of fixing liquid and enhance the installation stability of the pile body 1 and the foundation pile. At the same time, the pile body 1 is lifted up and down, and the magnifying wing 2 can knock the upper and lower side walls in the expanded groove during this process to enhance the supporting strength of the inner wall of the pile groove. And the rotating rod body 6 is connected to the rotating inner rotation, which is equivalent to forming a solid structure with the pile body 1, so that the overall strength of the pile body 1 is not affected.

[0040] In addition, the upper end of the rotating rod body 6 is flush with the upper end of the pile body 1. The upper end of the rotating rod body 6 is recessed downward with a multi-faceted transmission groove. A hoisting buckle 61 is fixed on the inner bottom wall of the multi-faceted transmission groove. By inserting the multi-faceted hollow rotating power head into the multi-faceted transmission groove, the rotation of the rotating rod body 6 is driven, so as to automatically adjust the height of the lifting seat 62.

[0041] In addition, by sliding the two magnifying wings 2 together, they can be accommodated in the inner wall of the annular groove, and the outer wall of the magnifying wing 2 is flush with the outer wall of the pile body 1, so as not to affect the normal embedding of the pile body 1 into the pile groove.

[0042] The two magnifying wings 2 are opened along the radial direction of the pile body 1 and rotate with the pile body 1, so as to expand the soil on the radial side wall in the pile groove. While the pile body 1 rotates, it reciprocates up and down. While the magnifying wings 2 rotate and lift and fall up and down, an annular expansion support groove with sufficient height is formed on the radial side wall in the pile groove by the magnifying wings 2.

[0043] Generally speaking, due to its superior performance and wide application fields, the prestressed concrete special-shaped solid square pile has become an indispensable important component in modern architecture and civil engineering.

[0044] In a further embodiment, when the square pile is used as a bearing pile, the number of full-pile joints should not exceed 3, and welding can be used for pile connection. When used as a tension pile, mechanical connection plus welding should be used for pile joints; AB-type and B-type piles should be selected. The number of full-pile joints should not exceed 1, and the joint should be located below 10 m from the pile top.

[0045] In another embodiment of the present application, 1) The cement should be Portland cement or ordinary Portland cement with a strength grade not lower than 42.5, and the quality should comply with the provisions of "General Portland Cement" GB175.

[0046] 2) The fine aggregate should preferably be clean natural hard medium-coarse sand or artificial sand. When natural sand is used, the crushing index should not be greater than 20%, and the fineness modulus should preferably be 2.5 - 3.2; when artificial sand is used, the fineness modulus can be 2.5 - 3.5, and the quality should comply with the provisions of "Sand for Construction" GB / T14684. Moreover, the mud content of the sand should not be greater than 1%, the chloride ion content should not be greater than 0.01%, the sulfide and sulfate content should not be greater than 0.5%, and the soundness should meet the requirements in "General Code for Concrete Structures" GB55008.

[0047] 3) The coarse aggregate shall be crushed stone or crushed pebbles, with continuous grading. The crushing index shall not be greater than 10%, the needle-like and flaky particles shall not exceed 5%, the maximum particle size shall not be greater than 25 mm, and it shall not exceed 3 / 4 of the clear distance between steel bars. Its quality shall comply with the provisions of "Pebbles and Crushed Stones for Construction" GB / T 14685, and the mud content shall not be greater than 0.5%, the sulfide and sulfate content shall not be greater than 0.5%, and the soundness shall meet the requirements in "General Code for Concrete Structures" GB55008.

[0048] 4) The quality of the water used for concrete mixing shall comply with the relevant provisions of "Standard for Water Used in Concrete" JGJ63.

[0049] 5) The quality of the admixture shall comply with the relevant provisions of "Technical Specification for Application of Concrete Admixtures" GB50119, and admixtures containing chlorides or harmful substances shall not be used.

[0050] 6) Mineral admixtures such as granulated blast-furnace slag powder, fly ash, silica fume powder or silica fume are preferably used. The quality of the silica fume powder shall comply with the relevant provisions in Table 1 of "Silica Fume Powder for Prestressed High-Strength Concrete Pipe Piles" JC / T950. The quality of the granulated blast-furnace slag powder shall not be lower than the relevant provisions of "Ground Granulated Blast-Furnace Slag for Use in Cement and Concrete" GB / T18046. The quality of the fly ash shall not be lower than the relevant provisions of "Fly Ash for Use in Cement and Concrete" GB / T1596. The quality of the silica fume shall comply with the relevant provisions of "Mineral Admixtures for High-Strength and High-Performance Concrete" GB / T18736. When using other types of admixtures, it shall be identified through tests and confirmed to meet the quality requirements of the concrete for square piles before use.

[0051] The spiral stirrup shall preferably be made of low-carbon steel hot-rolled wire rods or grade A cold-drawn low-carbon steel wire for concrete products. Their quality shall respectively comply with the relevant provisions of "Hot-Rolled Plain Carbon Steel Wire Rods" GB / T701, "Cold-Drawn Low-Carbon Steel Wire for Concrete Products" JC / T540, and "Technical Specification for Application of Cold-Drawn Low-Carbon Steel Wire" JGJ19.

[0052] An end plate shall be provided at the connection between the end of the square pile and the pile tip. The end plate is made of Q235B steel. The performance of the steel used for the end plate shall comply with the relevant provisions of "End Plates for Prestressed Centrifugal Concrete Hollow Square Piles" JC / T2239, and there shall be no negative deviation in the end plate thickness. The pile sleeve hoop is made of Q235 steel, and its quality shall comply with the provisions of Q235 in "Carbon Structural Steel" GB / T700. The connecting plate and angle steel are made of Q235B steel, and their quality shall comply with the provisions of Q235 in "Carbon Structural Steel" GB / T700.

[0053] When using the lifting ring scheme, the lifting ring shall preferably be made of HPB300 steel bars, and its quality shall comply with the provisions of "Steel for the Reinforcement of Concrete - Part 1: Hot-Rolled Plain Bars" GB / T1499.1 or the provisions of "Carbon Structural Steel" GB / T700.

[0054] When the steel material is HPB300 grade steel bars, E43xx type electrodes shall be used; for Q355 steel, E50xx type electrodes shall be used; and for HRB400 grade steel bars, E55xx type electrodes shall be used. The quality of the electrodes shall comply with the provisions of "Carbon Steel Electrodes" GB / T 5117.

[0055] In this embodiment, during pile driving, 1) a suitable pile driving machine shall be selected according to the design documents, engineering investigation reports, and the surrounding environment of the construction site. 2) The pile driving machines for square piles are divided into two types: hammer-driven machines and static pressure machines. For hammer-driven pile driving, diesel hammers and hydraulic hammers are preferably used; for static pressure pile driving, hydraulic machines are preferably used, which are divided into two types: top pressure type and clamp pressure type according to the construction method. 3) For hammer-driven pile driving: (1) When controlling by the total number of hammer blows, the total number of hammer blows for any single pile shall not exceed 2,500, and the number of hammer blows for the last 1 m shall not exceed 200; (2) The gap between the pile cap and the pile driver and the square pile shall be 5 mm to 10 mm; an elastic gasket shall be added between the pile hammer and the pile cap, and between the pile cap or the pile driver and the pile top. The thickness of the gasket shall be uniform, and the thickness after being compacted by hammer blows shall not be less than 120 mm; (3) It is strictly prohibited to use a square pile instead of a pile driver to drive the pile. 4) For static pressure pile driving: When using a top pressure type pile driver, an elastic gasket shall be added between the pile cap, the pile driver, and the pile; when using a clamp pressure type pile driver, the fixture shall avoid the joint position on both sides of the pile body. 5) During pile driving, the pile hammer, pile cap, or pile driver shall be on the same axis as the pile body. The verticality deviation of the first section of the square pile when inserted into the ground shall not exceed 0.5%. 6) During the pile driving process, the verticality of the pile body shall be monitored, and the verticality deviation of the pile body shall not exceed 1%. It is strictly prohibited to use methods such as forcibly pulling back by moving the pile frame to correct the deviation. 7) Each pile shall be driven in place continuously in one go, and pile splicing and pile driving shall be carried out continuously, and the intermediate stop time shall be reduced. 8) During the pile driving process, when abnormal situations such as abnormal penetration, pile body inclination, displacement, pile body or pile top damage occur, pile driving shall be stopped. After finding out the reasons and carrying out necessary treatments, construction can continue. 9) The allowable deviation of the pile position of the square pile shall be implemented in accordance with "Code for Acceptance of Construction Quality of Building Foundation" GB50202.

[0056] When splicing piles: 1) For compression piles, end plate welding is used at the splicing joint. 2) For tension piles, mechanical connection plus end plate welding is used at the splicing joint. 3) Pile splicing should be carried out before and after the pile tip penetrates the hard soil layer, and it is not suitable to carry out in the hard soil layer. 4) In addition to meeting the requirements of the secondary weld in the current national standard "Code for Acceptance of Construction Quality of Steel Structure Engineering" GB50205, welding pile splicing should also comply with the following regulations: (1) The part of the pile body buried in the soil should preferably be 0.5m - 1.0m above the ground; (2) A guide hoop should preferably be set at the pile end of the lower pile section. When splicing piles, the upper and lower pile sections should be kept straight, and the misalignment deviation should not be greater than 2mm. (3) When splicing piles section by section, when the pile length L ≤ 15m, the bending deflection of the joint should not be greater than L / 1000; when 15m < L ≤ 30m, the bending deflection of the joint should not be greater than L / 2000 and should not be greater than 15mm. 6) Welding can be carried out by manual welding or carbon dioxide gas shielded welding. The number of welding layers should preferably be three. The slag of the inner layer should be cleaned before welding the outer layer. The weld should be full, continuous, and the root should be welded through. 7) When using manual welding, the first layer should be welded with an E43xx type electrode with a diameter of 3.2mm, and the root should be welded through. The outer two layers can use E43xx type electrodes. When using carbon dioxide gas shielded welding, the welding wire should preferably be ER50-6 welding wire. 8) After the pile joint is welded, visual inspection should be carried out. After passing the inspection, it should be allowed to cool naturally before continuing to drive the pile. The natural cooling time should not be less than 8 minutes; when using carbon dioxide gas shielded welding, the cooling time should not be less than 3 minutes. 9) When cutting square piles, a pile saw should be used, and knocking to cut the pile is strictly prohibited.

[0057] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Prestressed concrete special-shaped solid square piles, characterized by: The invention comprises a pile body (1) with an elliptical cross-section and a docking seat (4) for quickly docking with a foundation pile, wherein an extension portion extends from the bottom end of the pile body (1), the docking seat (4) is connected to the bottom wall of the extension portion in a rotationally adjustable manner, the radial side wall of the docking seat (4) exceeds the radial side wall of the extension portion to form a guide portion, the radial side wall of the guide portion is provided with a plurality of guide notches along the axial direction, a docking block (5) flush with the radial outer wall of the guide portion is adjustably provided in the guide notch, a threaded retaining sleeve (3) is threadedly connected to the radial side wall of the guide portion and the radial outer walls of the plurality of docking blocks (5), and the threaded retaining sleeve (3) can be threadedly connected to the radial side wall of the upper end of the foundation pile; The threaded retaining sleeve (3) is rotated downward along the axial direction of the guide portion to the intersection of the guide portion and the upper end of the foundation pile, and the threaded retaining sleeve (3) is locked at the intersection of the guide portion and the foundation pile.

2. The prestressed concrete special-shaped solid square pile according to claim 1, characterized in that: The radial side wall of the docking seat (4) does not extend beyond the vertical plane where the radial side wall of the pile body (1) is located.

3. The prestressed concrete special-shaped solid square pile according to claim 1, characterized in that: A sliding block is fixed to the side wall of the docking block (5), and a sliding groove for the sliding block to slide up and down is provided on the inner wall of the guide notch.

4. The prestressed concrete special-shaped solid square pile according to claim 3, characterized in that: The axial length of the docking block (5) is at least the sum of the axial length of the guide notch and the axial length of the docking notch pre-opened in the foundation pile.

5. The prestressed concrete special-shaped solid square pile according to claim 1, characterized in that: The radial side wall of the pile body (1) is provided with a plurality of annular grooves, and a soil expansion piece capable of opening and retracting along the radial direction of the annular groove is provided in the annular groove. The soil expansion piece can be rotated in the radial direction of the pile body (1) to expand the radial space in the pile groove.

6. The prestressed concrete special-shaped solid square pile according to claim 5, characterized in that: The expansion piece is two half hollow elliptical enlarged wings (2); The two magnifying wings (2) are both fixed with T-shaped sliding rods (21) on the opposite side walls. A rotation groove is formed downwardly at the upper end of the pile body (1). A rotation rod body (6) is rotatably arranged in the rotation groove. A pull-out opening (11) communicating with the rotation groove is formed on the radial side wall of the pile body (1). A lifting seat (62) is threadedly connected to the outer wall of the rotation rod body (6). Two guide rods (63) are symmetrically arranged on the radial side wall of the lifting seat (62). The two guide rods (63) extend downwardly and tilted away from each other. The T-shaped sliding rod (21) slides through the pull-out opening (11) and then extends into the rotation groove. A guide hole is formed at the end of the T-shaped sliding rod (21) and is slidably plugged with the guide rod (63). A limit plate is fixed to the bottom wall of the T-shaped sliding rod (21) to prevent the T-shaped sliding rod (21) from escaping from the guide hole.

7. The prestressed concrete special-shaped solid square pile according to claim 6, characterized in that: The upper end of the rotating rod body (6) is flush with the upper end of the pile body (1), and the upper end of the rotating rod body (6) is recessed downward to form a multi-angular transmission groove, and a lifting lock buckle (61) is fixed to the inner bottom wall of the multi-angular transmission groove.

8. The prestressed concrete special-shaped solid square pile according to claim 7, characterized in that: The two enlarged wings (2) are combined and accommodated in the inner wall of the annular groove, and the outer wall of the enlarged wings (2) is flush with the outer wall of the pile body (1).

9. The prestressed concrete special-shaped solid square pile according to claim 7, characterized in that: The two enlarged wings (2) are opened along the radial direction of the pile body (1), and the enlarged wings (2) rotate along with the pile body (1) to form an annular expansion groove with sufficient height on the radial side wall of the pile groove.

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