Special-shaped pile

Abstract

The utility model discloses a special-shaped pile which comprises a pile body, and the pile body comprises large section sections and small section sections which are alternately arranged in the length direction of the pile body. The two ends of the pile body are large-section sections; a first connecting section is further arranged at the end part of the large-section section at one end of the pile body; the area of the cross section of the first connecting section is smaller than that of the cross section of the large-section section, and the length L of the first connecting section is smaller than the sum of the specified connecting length L1 of the bearing platform and the prefabricated concrete pile and the thickness h of the cushion layer. And the partial length of the large-section section provided with the first connecting section is connected with the bearing platform and / or the cushion layer. According to the special-shaped pile, the plane size of the bearing platform can be reduced, the construction cost can be reduced, meanwhile, it can be guaranteed that the joint of the end of the prefabricated concrete pile and the bearing platform can obtain high shear resistance and vibration resistance, and the safety performance of the bearing platform and a building on the bearing platform is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete piles, in particular to a special-shaped pile. Background Art

[0002] Pile cap foundation is a form of foundation structure, a deep foundation consisting of piles and pile caps (referred to as caps) connected to the top of the piles, referred to as pile foundations. Pile foundations have the characteristics of high bearing capacity, small and relatively uniform settlement, and can be applied to almost all engineering geological conditions and various types of projects, especially for heavy buildings (structures) built on soft foundations.

[0003] In the pile cap, cast-in-place construction is generally adopted to connect with the precast piles. The plane size of the pile cap is closely related to the plane arrangement of the piles and the size of the connection part between the piles and the cap. However, the size of the connection part between the existing precast piles and the cap is consistent with the size of the pile body, which increases the plane size of the cap and increases the construction cost. At the same time, if the cross-sectional size of the pile is reduced, the shear and vibration resistance of the connection between the pile and the cap will be reduced, affecting the safety of the cap and the building thereon. Utility Model Content

[0004] The utility model proposes a special-shaped pile in view of the above problems.

[0005] The technical means adopted by the utility model are as follows:

[0006] A special-shaped pile, comprising a pile body, wherein the pile body comprises large cross-section segments with a square cross-section shape and small cross-section segments with a circular cross-section shape alternately arranged along the length direction of the pile body; both ends of the pile body are large cross-section segments;

[0007] A first connecting section is also provided at the end of the large cross-section section at one end of the pile body;

[0008] The cross-sectional area of ​​the first connecting section is smaller than the cross-sectional area of ​​the large cross-sectional section. The length L of the first connecting section, the length L1 of the connection between the specified cap and the precast concrete pile, and the thickness h of the cushion layer satisfy formula (1):

[0009] L≤L1+h (1)

[0010] When the special-shaped pile is connected to the cap, a portion of the length of a large-section section provided with the first connecting section is connected to the cap and / or the cushion layer.

[0011] Further, the cross-sectional shape of the first connecting section is circular, and the length L of the first connecting section is greater than the prescribed connection length L1 between the cap and the precast concrete pile; or,

[0012] The cross-sectional shape of the first connecting section is circular, and the length L of the first connecting section is less than or equal to a specified connection length L1 between the cap and the precast concrete pile.

[0013] Furthermore, the length L of the first connection section and the specified connection length L1 between the cap and the precast concrete pile satisfy formula (2):

[0014] 10≤L≤L1 (2)

[0015] The unit of length in formula (2) is mm.

[0016] Furthermore, the prescribed connection length between the cap and the precast concrete pile is L1 = 50-100 mm.

[0017] Furthermore, the length L of the first connecting section is less than or equal to 50 mm.

[0018] Furthermore, the length H1 of the large cross-section segment and the length H2 of the small cross-section segment satisfy formula (3) and formula (4):

[0019] H1+H2≤2000 (3)

[0020] 100≤H1≤1800 (4)

[0021] Wherein, the length unit in formula (3) and formula (4) is mm.

[0022] Furthermore, two reinforcing ribs are symmetrically arranged on the side wall of the small cross-section segment.

[0023] Furthermore, a smooth transition surface is provided between the large cross-section section and the small cross-section section, and between the large cross-section section and the connecting section.

[0024] Furthermore, the special-shaped piles are prestressed piles, non-prestressed piles or mixed reinforced piles.

[0025] Furthermore, the end of the large cross-section segment at the other end of the pile body is also provided with a second connecting segment whose cross-sectional area is smaller than the cross-sectional area of ​​the large cross-sectional segment; the end of the first connecting segment and the end of the second connecting segment are both provided with end plates connected to the main reinforcement, and the two adjacent sections of the special-shaped piles are connected by welding the end plates.

[0026] Furthermore, the end of the large cross-section section at the other end of the pile body is also provided with a second connecting section whose cross-sectional area is smaller than that of the large cross-sectional area; the end of the first connecting section and the end of the second connecting section are both provided with end plates connected to the main reinforcement, and the end plates are provided with mechanical joints;

[0027] Two adjacent sections of special-shaped piles are connected by mechanical joints on the end plates, or two adjacent sections of special-shaped piles are connected by mechanical joints on the end plates and end plate welding.

[0028] Furthermore, the mechanical joint is a pre-tightened mechanical joint or a non-pre-tightened mechanical joint.

[0029] Furthermore, the end of the large cross-section segment at the other end of the pile body is also provided with a second connecting segment whose cross-sectional area is smaller than the cross-sectional area of ​​the large cross-sectional segment; the end of the first connecting segment and the end of the second connecting segment are provided with a mechanical joint connected to the main reinforcement, and two adjacent sections of the special-shaped piles are connected by clamping the mechanical joint to realize the connection of the special-shaped piles.

[0030] Furthermore, the outer walls of the first connecting section and the second connecting section are both provided with skirt plates, and the outer diameter of the first connecting section is different from the outer diameter of the second connecting section;

[0031] The inner diameter of the skirt plate arranged on the outer wall of the connecting section with a larger size is larger than the outer diameter of the skirt plate arranged on the outer wall of the connecting section with a smaller size;

[0032] The length of the skirt plate arranged on the outer wall of the large-sized connecting section is greater than the length of the corresponding connecting section, so that the end of the connecting section forms a receiving groove surrounded by the skirt plate. When adjacent connecting special-shaped piles are connected, part of the length of the small-sized connecting section can be inserted into the receiving groove.

[0033] Furthermore, when two adjacent sections of special-shaped piles are connected, a portion of the length of the connecting section with a smaller size is inserted into the receiving groove, and the skirt plates are welded and connected.

[0034] Furthermore, the inner diameter d1 of the skirt plate disposed on the outer wall of the connecting section with a larger size and the outer diameter d2 of the skirt plate disposed on the outer wall of the connecting section with a smaller size satisfy formula (5);

[0035] d1= d2+(1~10) (5)

[0036] In formula (5), the unit of length is mm.

[0037] Furthermore, the inner diameter d1 of the skirt plate disposed on the outer wall of the connecting section with a large size and the outer diameter d2 of the skirt plate disposed on the outer wall of the connecting section with a small size satisfy formula (5):

[0038] d1= d2+(1~3) (5)

[0039] In formula (5), the unit of length is mm.

[0040] Furthermore, the length M1 of the skirt plate disposed on the outer wall of the large-sized connecting section and the length M2 of the corresponding connecting section satisfy formula (6):

[0041] M1=M2+(5~20) (6)

[0042] In formula (6), the unit of length is mm.

[0043] Furthermore, the connecting end surface is provided with epoxy resin glue.

[0044] Furthermore, the mechanical joint is a pre-tightened mechanical joint or a non-pre-tightened mechanical joint.

[0045] Compared with the prior art, the special-shaped pile disclosed in the utility model has the following beneficial effects: the special-shaped pile disclosed in the present application is provided with a first connecting section at the end of the large-section section at one end of the pile body, the cross-sectional area of ​​the first connecting section is smaller than the cross-sectional area of ​​the large-section section, and the length L of the first connecting section is less than or equal to the sum of the length L1 of the connection between the cap and the precast concrete pile and the thickness h of the cushion layer, so that when the special-shaped pile is connected to the cap, a part of the length of a section of the large-section section provided with the first connecting section is connected to the cap and / or the cushion layer, that is, the cross-sectional size of the first connecting section is smaller than the size of the large-section section, so that the plane size of the cap can be reduced, and the construction cost can be reduced. At the same time, since part of the large-section section is located in the cap and / or the cushion layer, the connection between the cap and the precast pile has greater strength, which can ensure that the connection between the end of the precast concrete pile and the cap can obtain higher shear resistance and vibration resistance, thereby improving the safety performance of the cap and the building thereon. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural diagram of an embodiment of the special-shaped pile disclosed in the utility model;

[0047] Figure 2 for Figure 1 An enlarged schematic diagram of the dashed box in the middle;

[0048] Figure 3 This is a schematic diagram of the first type of connection between the special-shaped pile and the cap disclosed in the utility model, in which the length of the first connection section is consistent with the length of the connection between the cap and the precast concrete pile;

[0049] Figure 4 This is a schematic diagram of the second relationship between the special-shaped pile and the cap disclosed in the utility model, in which the length of the first connection section is less than the specified length of the connection between the cap and the precast concrete pile;

[0050] Figure 5 This is a schematic diagram of a third type of relationship between the special-shaped pile and the cap disclosed in the utility model, in which the length of the first connection section is greater than the prescribed length of the connection between the cap and the precast concrete pile;

[0051] Figure 6 It is a structural schematic diagram of the end of the special-shaped pile disclosed in the utility model;

[0052] Figure 7 It is a schematic diagram of connecting two adjacent sections of special-shaped piles disclosed in the utility model;

[0053] Figure 8 for Figure 7 The middle dotted line frame part is a schematic diagram of the first method of connecting two pile sections, in which two end plates are welded together;

[0054] Fig. 9 for Figure 7 The schematic diagram of the second method of connecting two pile sections in the middle dotted frame part shows a mechanical joint clamping connection between two end plates;

[0055] Fig.10 for Figure 7 The schematic diagram of the third method of connecting two pile sections in the middle dotted frame part shows the connection of two end plates by welding and mechanical joint clamping;

[0056] Fig.11 It is a structural diagram of another embodiment of the special-shaped pile disclosed in the utility model;

[0057] Fig.12 for Fig.11 The enlarged schematic diagram in the dashed box A;

[0058] Fig.13 for Fig.11 The enlarged schematic diagram in the dashed box B;

[0059] Fig.14 It is a schematic diagram of connecting two sections of another embodiment of the special-shaped pile disclosed in the utility model;

[0060] Fig.15 for Fig.14 A cross-sectional view of

[0061] Fig.16 for Fig.15 The enlarged schematic diagram of the dotted box in the middle shows that the two piles are connected by a mechanical joint;

[0062] Fig.17 for Fig.15 An enlarged schematic diagram of the dotted box in the middle, in which the two piles are connected by mechanical joints and welding.

[0063] In the figure: 1, pile body; 10, large cross-section section; 11, small cross-section section; 110, reinforcing rib; 12, first connecting section; 13, smooth transition surface; 14, second connecting section; 15, end plate; 16, mechanical joint; 17, skirt plate; 170, receiving groove; 18, main reinforcement; 2, base; 3, cushion layer; 4, welding point. DETAILED DESCRIPTION

[0064] like Figure 1 and Figure 2 The special-shaped pile disclosed in the utility model is shown, comprising a pile body 1, wherein the pile body 1 comprises a large cross-section segment 10 with a square cross-section shape and a small cross-section segment 11 with a circular cross-section shape alternately arranged along the length direction of the pile body 1; both ends of the pile body 1 are large cross-section segments 10;

[0065] The end of the large cross-section section 10 at one end of the pile body 1 is also provided with a first connecting section 12;

[0066] The cross-sectional area of ​​the first connecting section 12 is smaller than the cross-sectional area of ​​the large cross-sectional section 10. The length L of the first connecting section 12, the length L1 of the connection between the cap 2 and the precast concrete pile, and the thickness h of the cushion layer 3 satisfy formula (1):

[0067] L≤L1+h (1)

[0068] When the special-shaped pile is connected to the cap 2 , a portion of the length of the large-section section 10 provided with the first connecting section 12 is connected to the cap 2 and / or the cushion layer 3 .

[0069] Specifically, according to the Technical Specification for Building Pile Foundations JGJ94-2008, page 12, 3.3.3, the arrangement of foundation piles shall meet the following conditions for the minimum center distance of foundation piles: The center distance between piles is determined by the diameter or side length. For example, in some specifications, it is required that the distance between the center of the pile and the edge of the foundation should not be less than the diameter of the pile or the side length of the pile, and the center of two adjacent piles should be 4 times the diameter of the pile or the side length of the pile. In this embodiment, since a first connecting section is also provided at the end of the large cross-section section at one end of the pile body, the cross-sectional area of ​​the first connecting section is smaller than the cross-sectional area of ​​the large cross-sectional section, and the length L of the first connecting section is less than or equal to the specified distance between the foundation and the pre-assembled foundation. The sum of the length L1 of the precast concrete pile connection and the thickness h of the cushion layer, so that when the special-shaped pile is connected to the pedestal, part of the length of a large-section section with a first connecting section is connected to the pedestal and / or the cushion layer, that is, the cross-sectional size of the first connecting section is smaller than that of the large-section section, so that the plane size of the pedestal can be reduced, and the construction cost can be reduced. At the same time, since part of the large-section section is located in the pedestal and / or the cushion layer, the strength of the special-shaped pile is generally greater than that of the pedestal, so that the connection between the pedestal and the precast pile has greater strength, and the connection between the end of the precast concrete pile and the pedestal can obtain higher shear and vibration resistance, thereby improving the safety performance of the pedestal and the building thereon.

[0070] Further, the cross-sectional shape of the first connecting section 12 is circular, and the length L of the first connecting section 12 is greater than the specified connection length L1 between the cap 2 and the precast concrete pile; or,

[0071] The cross-sectional shape of the first connecting section is circular, and the length L of the first connecting section 12 is less than or equal to the specified connection length L1 between the cap and the precast concrete pile.

[0072] Specifically, in some embodiments, Figure 5 As shown, the cross-sectional shape of the first connecting section 12 is circular, and the length L of the first connecting section 12 is greater than the specified connection length L1 between the cap and the precast concrete pile. Since the second-order inertia moment of a circular column is larger than that of a square column, its shear resistance and bending and torsion resistance under distributed load are more superior, so that it has a strong shear resistance after being connected to the cap. At the same time, since the length L of the first connecting section is greater than the specified connection length L1 between the cap and the precast concrete pile, that is, when the cap is connected to the special-shaped pile, part of the length of the first connecting section is located in the cushion layer, and part of the length of the large cross-section section is also located in the cushion layer, so that when the special-shaped pile in this embodiment is used to connect the cap, it can not only reduce the plane size of the cap and reduce the construction cost, but also ensure that the connection between the cap and the special-shaped pile can obtain higher shear resistance and vibration resistance.

[0073] In some embodiments, Figure 3 and Figure 4 As shown, the cross-sectional shape of the first connection section 12 is circular, and the length L of the first connection section 12 is less than or equal to the specified connection length L1 between the cap and the precast concrete pile. Since the second-order moment of inertia of a circular column is larger than that of a square column, its shear resistance and bending and torsion resistance under distributed load are more superior, so that it has strong shear resistance after being connected to the cap. At the same time, the length L of the first connection section is less than or equal to the specified connection length L1 between the cap and the precast concrete pile. That is to say, when the cap is connected to the special-shaped pile, part of the length of the large cross-sectional section is located in the cushion layer and the cap, so that when the special-shaped pile in this embodiment is used to connect the cap, it can not only reduce the plane size of the cap and reduce the construction cost, but also ensure that the connection between the cap and the special-shaped pile can obtain higher shear resistance and vibration resistance. Figure 3 The length L of the first connecting section 12 is equal to the specified connection length L1 between the cap and the precast concrete pile; Figure 4 The length L of the first connecting section 12 is less than the specified connection length L1 between the cap and the precast concrete pile.

[0074] In some embodiments, the length L of the first connecting section 12 and the specified connection length L1 between the cap and the precast concrete pile satisfy formula (2):

[0075] 10≤L≤L1 (2)

[0076] The length unit in formula (2) is mm. That is, in these embodiments, by setting the length of the first connection section to be greater than or equal to 10 mm and less than or equal to the specified connection length L1 between the cap and the precast concrete pile, when the cap is connected to the special-shaped pile in these embodiments, part of the length of the large cross-section section is located in the cushion layer and the cap, so that when the special-shaped pile in this embodiment is connected to the cap, the plane size of the cap can be reduced, the construction cost can be reduced, and the connection between the cap and the special-shaped pile can obtain higher shear and vibration resistance.

[0077] In some embodiments, the connection length L1 between the cap and the precast concrete pile is specified to be 50-100 mm. Accordingly, in these embodiments, the length of the first connection section 12 is greater than 50-100 mm. In other embodiments, the length of the first connection section 12 is less than or equal to 50-100 mm. This allows the special-shaped piles in this embodiment to reduce the plane size of the cap and reduce the construction cost when connected to the cap, while ensuring that the connection between the cap and the special-shaped pile can obtain higher shear and vibration resistance.

[0078] In some embodiments, the length L of the first connecting section 12 is less than or equal to 50 mm and greater than or equal to 10 mm, so that when the special-shaped pile in this embodiment is connected to the cap, the plane size of the cap can be reduced and the construction cost can be reduced, and the connection between the cap and the special-shaped pile can obtain higher shear resistance and vibration resistance.

[0079] In some embodiments, the length H1 of the large cross-section segment 10 and the length H2 of the small cross-section segment 11 satisfy formula (3) and formula (4):

[0080] H1+H2≤2000 (3)

[0081] 100≤H1≤1800 (4)

[0082] The length unit in formula (3) and formula (4) is mm. When the length of the large cross-section segment is within this range, the static press can obtain a larger clamping area, so that the static press can clamp the special-shaped pile in this embodiment for pile sinking. At the same time, when the lengths of the large cross-section segment and the small cross-section segment are less than 2000 mm, the static press can sequentially clamp the square segment (large cross-section segment) of the special-shaped pile in this embodiment for pile sinking.

[0083] like Figure 1As shown, in some embodiments, two reinforcing ribs 110 are symmetrically arranged on the side wall of the small cross-section segment 11. Due to the provision of the reinforcing rib structure, not only the circumference of the small cross-section segment is increased, but also the side area of ​​the special-shaped segment is increased, thereby increasing the friction between the pile and the soil, and improving the bearing capacity of the pile, and at the same time, the bending, shear and compression resistance of the small cross-section segment are improved. At the same time, by providing the reinforcing rib, the surface of the reinforcing rib is flush with the surface of the large cross-section segment, and then, it is convenient to discharge the bubbles in the pile body during the casting process of the special-shaped pile, thereby ensuring the strength of the pile body.

[0084] like Figure 1 As shown, in some embodiments, a smooth transition surface 13 is provided between the large cross-section section 10 and the small cross-section section 11, and between the large cross-section section 10 and the connecting section. That is, a smooth transition surface is provided at both ends of the large cross-section section, so that when the pile is sunk, the smooth transition surface can reduce the resistance during the pile sinking, and at the same time, it can also play a guiding role in the pile sinking process, thereby ensuring the pile sinking quality. The smooth transition surface can be an inclined surface, an arc surface or any other structural form that can achieve this function.

[0085] In some embodiments, the special-shaped pile is a prestressed pile, a non-prestressed pile or a mixed reinforced pile. Specifically, in these embodiments, the special-shaped pile includes a pile body and main reinforcements arranged in the pile body. The prestressed pile is a pile in which a certain tension is applied to the main reinforcement during the pouring of the concrete pile, so that a certain prestress is retained in the main reinforcement after the pouring of the concrete pile is completed; the non-prestressed pile is a pile in which no tension is applied to the main reinforcement during the pouring of the concrete pile, so that no prestress is retained in the main reinforcement after the pouring of the concrete pile is completed; the mixed reinforced pile is a pile in which a certain tension is applied to some of the main reinforcements during the pouring of the concrete pile, and no tension is applied to some of the main reinforcements, so that after the pouring of the concrete pile is completed, a certain prestress is retained in some of the main reinforcements, and no prestress is retained in some of the main reinforcements. The main reinforcement can be a combination of any one or more forms of PC steel rods, steel strands and threaded steel.

[0086] like Figure 1 , Figure 7 and Figure 8 As shown, in some implementations, the end of the large cross-section segment 10 at the other end of the pile body 1 is further provided with a second connecting segment 14 whose cross-sectional area is smaller than the cross-sectional area of ​​the large cross-sectional segment 10; the end of the first connecting segment 12 and the end of the second connecting segment 14 are both provided with an end plate 15 connected to the main reinforcement 18, and two adjacent sections of the special-shaped piles are connected by welding the end plates 15.

[0087] Specifically, in some construction environments, the length of a single concrete pile is difficult to meet the friction force (the force between the soil and the friction pile) requirements during construction. Therefore, two or more piles need to be connected in sequence to meet the construction requirements. In this embodiment, the two ends of the special-shaped pile body are respectively provided with a first connecting section and a second connecting section whose cross-sectional area is smaller than the cross-sectional area of ​​the large cross-sectional section. The end of the first connecting section and the end of the second connecting section are both provided with an end plate connected to the main reinforcement. When the special-shaped pile is connected to the pedestal, the special-shaped pile is provided with one end (upper end) of the first connecting section connected to the pedestal, and a portion of the length of the large cross-sectional section connected to the first connecting section is located in the pedestal and / or in the pedestal, and the main reinforcement in the pedestal is connected to the end plate. The end (lower end) of the special-shaped pile provided with the second connecting section is connected to the first connecting section (upper end) of another section of the special-shaped pile, and the connection of the two sections of the special-shaped pile is achieved by welding the end plates; when multiple sections of the special-shaped pile need to be connected, the first connecting section and the second connecting section of the two connected sections of the special-shaped pile are connected in sequence and the connection of the special-shaped pile is achieved by welding the end plates. The number 4 in the figure is the welding point part.

[0088] like Figure 1 , Figure 7 and Fig. 9 As shown, in some embodiments, the end of the large cross-section section 10 at the other end of the pile body 1 is further provided with a second connecting section 14 whose cross-sectional area is smaller than that of the large cross-sectional section 10; the end of the first connecting section 12 and the end of the second connecting section 14 are both provided with an end plate 15 connected to the main reinforcement 18, and a mechanical joint 16 is provided on the end plate 15. Two adjacent sections of special-shaped piles are connected by the mechanical joint 16 on the end plate 15. Specifically, in some construction environments, the length of a single section of concrete piles is difficult to meet the requirements of friction force (the force between the soil and the friction pile) during construction. Therefore, two or more sections of piles need to be connected in sequence to meet the construction requirements. In this embodiment, the two ends of the special-shaped pile body are respectively provided with a first connecting section and a second connecting section whose cross-sectional area is smaller than that of the large cross-sectional section. The end of the first connecting section and the end of the second connecting section are both provided with an end plate connected to the main reinforcement, and a mechanical joint is provided on the end plate. When the special-shaped pile is connected to the cap, the special-shaped pile is provided with one end (upper end) of the first connecting section connected to the cap. The pedestal is connected, and part of the length of the large cross-section section connected to the first connecting section is located on the pedestal and / or in the pedestal, and the main reinforcement in the pedestal is connected to the end plate. The main reinforcement in the pedestal can be directly installed on the end plate, and can also be connected to the connecting sleeve arranged on the end plate (the connecting sleeve is a partial component of the mechanical joint). The end (lower end) of the special-shaped pile with the second connecting section is provided with a plug rod and other components, and the plug rod is installed on the end plate. When the end (lower end) of the special-shaped pile with the second connecting section is connected to the first connecting section (upper end) of another section of the special-shaped pile, the mechanical joints on the end plate can be mutually engaged to realize the connection of the special-shaped piles.

[0089] like Figure 1 , Figure 7 and Fig.10 As shown, in some embodiments, the end of the large cross-section segment 10 at the other end of the pile body 1 is further provided with a second connecting segment 14 whose cross-sectional area is smaller than that of the large cross-sectional segment 10; the end of the first connecting segment 12 and the end of the second connecting segment 14 are both provided with an end plate 15 connected to the main reinforcement 15, and a mechanical joint 16 is provided on the end plate 15; the two adjacent sections of the special-shaped piles are connected by clamping the mechanical joints on the end plates and welding the end plates to realize the connection of the special-shaped piles. Specifically, in some construction environments, the length of a single-section concrete pile is difficult to meet the friction force (the force between the soil and the friction pile) requirements during construction. Therefore, two or more sections of piles need to be connected in sequence to meet the construction requirements. In this embodiment, the two ends of the special-shaped pile body are respectively provided with a first connecting section and a second connecting section whose cross-sectional area is smaller than the cross-sectional area of ​​the large cross-sectional section. The end of the first connecting section and the end of the second connecting section are both provided with end plates connected to the main reinforcement, and mechanical joints are provided on the end plates. When the special-shaped pile is connected to the pedestal, the special-shaped pile is provided with one end (upper end) of the first connecting section connected to the pedestal, and a portion of the length of the large cross-sectional section connected to the first connecting section is located on the pedestal and / or in the pedestal. And the main reinforcement in the pedestal is connected to the end plate. The main reinforcement in the pedestal can be installed on the end plate directly, and can also be connected to the connecting sleeve arranged on the end plate (the connecting sleeve is a partial component of the mechanical joint). The end (lower end) of the special-shaped pile with the second connecting section is provided with a plug rod and other components, and the plug rod is installed on the end plate. When the end (lower end) of the special-shaped pile with the second connecting section is connected to the first connecting section (upper end) of another section of the special-shaped pile, the mechanical joints on the end plate can be mutually engaged to realize the connection of the special-shaped piles. At the same time, the end plates of the special-shaped piles connected by the mechanical joints are welded to realize both mechanical connection and welding connection, thereby further improving the reliability of the pile connection. The number 4 in the figure is the welding point part.

[0090] In some embodiments, the mechanical joint is a pre-tightened mechanical joint or a non-pre-tightened mechanical joint. A pre-tightened mechanical joint refers to a mechanical joint in which one or more moving parts exist, so that after the mechanical joint is connected, the moving parts are driven to eliminate the gap that may exist in the mechanical joint connection. The pre-tightened mechanical joint can be adopted, for example, patents CN202311134705.8-pre-tightened mechanical joint with spring clip, precast concrete pile and connection method, CN202311022115.6-pre-tightened mechanical joint with snap ring, precast concrete pile and connection method, CN202311021993.6-pre-tightened mechanical joint with toothed connection, precast concrete pile and connection method, C The mechanical joint structures disclosed in patents such as N202311029907.6-Pre-tightening mechanical joints, precast concrete piles and connection methods with clamping springs, CN202311076327.2-Pre-tightening mechanical joints, precast concrete piles and connection methods with multi-tooth clamps, CN202311029910.8-A direct-drive pre-tightening mechanical joint, precast concrete piles and connection methods, and CN202311029913.1-Pre-tightening mechanical joints with intermediate sleeves, precast concrete piles and connection methods, can also use other forms of pre-tightening mechanical joints. By using pre-tightening mechanical joints to connect, the gaps that may exist in the mechanical joint connection can be effectively eliminated, thereby improving the connection strength between the piles, thereby improving the pile connection performance. The mechanical joint may also be a non-pretightened mechanical joint. For example, the mechanical connector may be a mechanical connector disclosed in CN114351696A, CN204780879U, CN208169271U, CN210104726U, CN210562156U, CN212294638U, CN217758728U, CN218060286U, CN218090813U and CN218090813U, etc., which are not limited in this embodiment.

[0091] like Fig.11 and Fig.16As shown, in some embodiments, the end of the large-section segment 10 at the other end of the pile body 1 is further provided with a second connecting segment 14 whose cross-sectional area is smaller than that of the large-section segment 10; the end of the first connecting segment 12 and the end of the second connecting segment 14 are provided with a mechanical joint 16 connected to the main reinforcement 18, and two adjacent sections of special-shaped piles are connected by the mechanical joint 16. Specifically, in some construction environments, the length of a single section of concrete piles is difficult to meet the requirements of friction (the force between the soil and the friction pile) during construction. Therefore, two or more sections of piles need to be connected in sequence to meet the construction requirements. In this embodiment, the two ends of the special-shaped pile body are respectively provided with a first connecting segment and a second connecting segment whose cross-sectional area is smaller than that of the large-section segment. The ends of the first connecting segment and the ends of the second connecting segment are provided with a mechanical joint connected to the main reinforcement. Specifically, the mechanical joint generally includes components such as a large nut, a small nut, a plug rod, and a clamping assembly. The large nut and the small nut are respectively connected to the two ends of the main reinforcement in the pile body. The large nut is provided with a clamping assembly Parts, the plug rod is connected with the small nut. When the special-shaped pile is connected to the pedestal, the special-shaped pile is provided with one end (upper end) of the first connecting section connected to the pedestal, and a partial length of the large cross-section section connected to the first connecting section is located on the pedestal and / or in the pedestal, and the main reinforcement in the pedestal is connected to the connecting sleeve (the large nut of the mechanical joint). The special-shaped pile is provided with a plug rod and other components at one end (lower end) of the second connecting section. The special-shaped pile is provided with an end (lower end) of the second connecting section and is connected to the first connecting section (upper end) of another section of the special-shaped pile. The plug rod can be inserted into the large nut of the lower section of the pile and clamped with the clamping assembly, thereby realizing the connection of the special-shaped piles of two adjacent sections through the clamping of the mechanical joint.

[0092] In some embodiments, the mechanical joint is a pre-tightened mechanical joint or a non-pre-tightened mechanical joint. A tight mechanical joint refers to a mechanical joint in which one or more moving parts exist, so that after the mechanical joint is connected, the moving parts are driven to eliminate the gap that may exist in the mechanical joint connection. The pre-tightened mechanical joint can be adopted, for example, patents CN202311134705.8-pre-tightened mechanical joint with spring clip, precast concrete pile and connection method, CN202311022115.6-pre-tightened mechanical joint with snap ring, precast concrete pile and connection method, CN202311021993.6-pre-tightened mechanical joint with toothed connection, precast concrete pile and connection method, C The mechanical joint structures disclosed in patents such as N202311029907.6-Pre-tightening mechanical joints, precast concrete piles and connection methods with clamping springs, CN202311076327.2-Pre-tightening mechanical joints, precast concrete piles and connection methods with multi-tooth clamps, CN202311029910.8-A direct-drive pre-tightening mechanical joint, precast concrete piles and connection methods, and CN202311029913.1-Pre-tightening mechanical joints with intermediate sleeves, precast concrete piles and connection methods, can also use other forms of pre-tightening mechanical joints. By using pre-tightening mechanical joints to connect, the gaps that may exist in the mechanical joint connection can be effectively eliminated, thereby improving the connection strength between the piles, thereby improving the pile connection performance. The mechanical joint may also be a non-pretightened mechanical joint. For example, the mechanical connector may be a mechanical connector disclosed in CN114351696A, CN204780879U, CN208169271U, CN210104726U, CN210562156U, CN212294638U, CN217758728U, CN218060286U, CN218090813U and CN218090813U, etc., which are not limited in this embodiment.

[0093] Furthermore, if Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, in some embodiments, the outer walls of the first connecting section 12 and the second connecting section 14 are both provided with a skirt plate 17, and the outer diameter of the first connecting section 12 is different from the outer diameter of the second connecting section 14;

[0094] The inner diameter of the skirt plate arranged on the outer wall of the connecting section with a larger size is larger than the outer diameter of the skirt plate arranged on the outer wall of the connecting section with a smaller size;

[0095] The length of the skirt plate arranged on the outer wall of the large-sized connecting section is greater than the length of the corresponding connecting section, so that the end of the connecting section forms a receiving groove 170 surrounded by the skirt plate. When adjacent connecting special-shaped piles are connected, part of the length of the small-sized connecting section can be inserted into the receiving groove.

[0096] Specifically, in some embodiments, the first connecting section of the special-shaped pile located at the uppermost side is connected to the cap, so its second connecting section faces downward. In these embodiments, the outer diameter of the first connecting section is larger than the outer diameter of the second connecting section, so that when the piles are connected, the connecting section with a smaller size faces downward, and the connecting section with a larger size faces upward. Therefore, when two adjacent pile sections are connected, the lower end of the upper pile can be conveniently inserted into the receiving groove surrounded by the skirt plate of the connecting section at the upper end of the lower pile during the lowering process, so as to improve the performance of the pile connection.

[0097] Furthermore, in some embodiments, Fig.17 As shown, when two adjacent sections of special-shaped piles are connected, part of the length of the small-sized connecting section is inserted into the receiving groove, and the skirts are welded and connected. That is, in these embodiments, when two adjacent sections of piles are connected, they are not only connected by the mechanical joints of the pile end faces, but also by welding the two skirts (the two skirts can be welded at the edges of the skirts located on the outside), so that two types of pile connection are realized, thereby improving the performance of the pile connection. The number 4 in the figure is the welding point part.

[0098] Furthermore, epoxy resin glue is provided on the connecting end faces of two adjacent sections of special-shaped piles, and the connection performance and anti-corrosion performance of the piles are improved by providing epoxy resin glue. At the same time, in some implementations, since the length of the skirt board provided on the outer wall of the large-sized connecting section is greater than the length of the corresponding connecting section, a receiving groove surrounded by the skirt board is formed at the end of the connecting section, and the receiving groove can prevent the epoxy resin glue from overflowing from between the connecting end faces, further improving the connection performance of the piles.

[0099] In some embodiments, the inner diameter d1 of the skirt plate disposed on the outer wall of the connecting section with a large size and the outer diameter d2 of the skirt plate disposed on the outer wall of the connecting section with a small size satisfy formula (5);

[0100] d1= d2+(1~10) (5)

[0101] The length unit in formula (5) is mm. Therefore, when the piles are connected, the small-sized connecting section faces downward, and the large-sized connecting section faces upward, so that when two adjacent piles are connected, the lower end of the upper pile can be conveniently inserted into the receiving groove surrounded by the skirt of the connecting section at the upper end of the lower pile during the lowering process. At the same time, the receiving groove can prevent the epoxy resin glue from overflowing from between the connecting end faces, further improving the connection performance of the pile. Preferably, the inner diameter d1 of the skirt arranged on the outer wall of the large-sized connecting section and the outer diameter d2 of the skirt arranged on the outer wall of the small-sized connecting section satisfy formula (5):

[0102] d1= d2+(1~3) (5)

[0103] The length unit in formula (5) is mm, so as to obtain better pile connection performance.

[0104] In some embodiments, the length M1 of the skirt plate disposed on the outer wall of the large-sized connecting section and the length M2 of the corresponding connecting section satisfy formula (6):

[0105] M1=M2+(5~20) (6)

[0106] The unit of length in formula (6) is mm. The end of the connecting section is formed with a receiving groove surrounded by the skirt plate, and the receiving groove can prevent the epoxy resin glue from overflowing from between the connecting end faces, thereby further improving the connection performance of the pile.

[0107] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A special-shaped pile, characterized in that: The pile body comprises a large cross-section section with a square cross-section shape and a small cross-section section with a circular cross-section shape, which are alternately arranged along the length direction of the pile body; both ends of the pile body are large cross-section sections; A first connecting section is also provided at the end of the large cross-section section at one end of the pile body; The cross-sectional area of ​​the first connecting section is smaller than the cross-sectional area of ​​the large cross-sectional section. The length L of the first connecting section, the length L1 of the connection between the specified cap and the precast concrete pile, and the thickness h of the cushion layer satisfy formula (1): L≤L1+h (1) When the special-shaped pile is connected to the cap, a portion of the length of a large-section section provided with the first connecting section is connected to the cap and / or the cushion layer.

2. The special-shaped pile according to claim 1, characterized in that: The cross-sectional shape of the first connecting section is circular, and the length L of the first connecting section is greater than the prescribed connection length L1 between the cap and the precast concrete pile; or, The cross-sectional shape of the first connecting section is circular, and the length L of the first connecting section is less than or equal to a specified connection length L1 between the cap and the precast concrete pile.

3. The special-shaped pile according to claim 2, characterized in that: The length L of the first connection section and the specified connection length L1 between the cap and the precast concrete pile satisfy formula (2): 10≤L≤L1 (2) The unit of length in formula (2) is mm.

4. The special-shaped pile according to claim 3, characterized in that: The specified connection length between the cap and the precast concrete pile is L1 = 50 ~ 100mm.

5. The special-shaped pile according to claim 4, characterized in that: The length L of the first connecting section is less than or equal to 50 mm.

6. The special-shaped pile according to claim 1, characterized in that: The length H1 of the large cross-section segment and the length H2 of the small cross-section segment satisfy formula (3) and formula (4): H1+H2≤2000 (3) 100≤H1≤1800 (4) Wherein, the length unit in formula (3) and formula (4) is mm.

7. The special-shaped pile according to claim 1, characterized in that: Two reinforcing ribs are symmetrically arranged on the side wall of the small cross-section segment.

8. The special-shaped pile according to claim 1, characterized in that: A smooth transition surface is provided between the large cross-section section and the small cross-section section, and between the large cross-section section and the connecting section.

9. The special-shaped pile according to claim 1, characterized in that: The special-shaped piles are prestressed piles, non-prestressed piles or mixed reinforced piles.

10. The special-shaped pile according to any one of claims 1 to 9, characterized in that: The end of the large cross-section section at the other end of the pile body is also provided with a second connecting section whose cross-sectional area is smaller than that of the large cross-sectional area; the end of the first connecting section and the end of the second connecting section are both provided with end plates connected to the main reinforcement, and the two adjacent sections of the special-shaped piles are connected by welding the end plates.

11. The special-shaped pile according to any one of claims 1 to 9, characterized in that: The end of the large cross-section section at the other end of the pile body is also provided with a second connecting section whose cross-sectional area is smaller than that of the large cross-sectional section; the ends of the first connecting section and the second connecting section are both provided with end plates connected to the main reinforcement, and the end plates are provided with mechanical joints; Two adjacent sections of special-shaped piles are connected by mechanical joints on the end plates, or two adjacent sections of special-shaped piles are connected by mechanical joints on the end plates and end plate welding.

12. The special-shaped pile according to claim 11, characterized in that: The mechanical joint is a pre-tightened mechanical joint or a non-pre-tightened mechanical joint.

13. The special-shaped pile according to any one of claims 1 to 9, characterized in that: The end of the large cross-section segment at the other end of the pile body is also provided with a second connecting segment whose cross-sectional area is smaller than that of the large cross-sectional area; the end of the first connecting segment and the end of the second connecting segment are provided with a mechanical joint connected to the main reinforcement, and two adjacent sections of the special-shaped piles are connected by clamping the mechanical joints.

14. The special-shaped pile according to claim 13, characterized in that: The outer walls of the first connecting section and the second connecting section are both provided with skirt plates, and the outer diameter of the first connecting section is different from the outer diameter of the second connecting section; The inner diameter of the skirt plate arranged on the outer wall of the connecting section with a larger size is larger than the outer diameter of the skirt plate arranged on the outer wall of the connecting section with a smaller size; The length of the skirt plate arranged on the outer wall of the large-sized connecting section is greater than the length of the corresponding connecting section, so that the end of the connecting section forms a receiving groove surrounded by the skirt plate. When adjacent connecting special-shaped piles are connected, part of the length of the small-sized connecting section can be inserted into the receiving groove.

15. The special-shaped pile according to claim 14, characterized in that: When two adjacent sections of special-shaped piles are connected, part of the length of the connecting section with a smaller size is inserted into the receiving groove, and the skirt plates are welded and connected.

16. The special-shaped pile according to claim 14, characterized in that: The inner diameter d1 of the skirt plate disposed on the outer wall of the connecting section with a larger size and the outer diameter d2 of the skirt plate disposed on the outer wall of the connecting section with a smaller size satisfy formula (5); d1= d2+(1~10) (5) In formula (5), the unit of length is mm.

17. The special-shaped pile according to claim 16, characterized in that: The inner diameter d1 of the skirt plate disposed on the outer wall of the connecting section with a large size and the outer diameter d2 of the skirt plate disposed on the outer wall of the connecting section with a small size satisfy formula (5): d1= d2+(1~3) (5) In formula (5), the unit of length is mm.

18. The special-shaped pile according to claim 14, characterized in that: The length M1 of the skirt plate arranged on the outer wall of the large-sized connecting section and the length M2 of the corresponding connecting section satisfy formula (6): M1=M2+(5~20) (6) In formula (6), the unit of length is mm.

19. The special-shaped pile according to claim 14, characterized in that: The connection end faces are provided with epoxy resin glue.

20. The special-shaped pile according to claim 14, characterized in that: The mechanical joint is a pre-tightened mechanical joint or a non-pre-tightened mechanical joint.

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