CN215482903U - Strong composite pile foundation - Google Patents

Abstract

The utility model provides a strong composite pile foundation which comprises a stirring pile and a precast pile implanted in the stirring pile, wherein the precast pile is alternately provided with at least one thin pile section and at least one thick pile section along the length direction, at least one thick pile section is provided with at least one mounting groove, a bonding piece is mounted in the mounting groove, and the bonding piece stores a bonding material capable of escaping when being extruded. When the precast pile was implanted in the stirring stake, the cement soil of precast pile one side formed the extrusion to the bonding piece in the mounting groove, lead to the adhesive material who stores in the bonding piece to escape, adhesive material bonds precast pile and cement soil, can improve the joint strength of precast pile and stirring stake, improve tensile bearing capacity, in addition, cement soil is when the extrusion to the bonding piece in the mounting groove, in cement soil can get into the mounting groove, stirring stake after the consolidation forms the interlock state with the precast pile, further improve tensile bearing capacity.

Description

Strong composite pile foundation

Technical Field

The utility model relates to the technical field of precast piles, in particular to a strong composite pile foundation.

Background

The precast reinforced concrete pile is prefabricated in a factory under the general condition, and then is transported to the place where the pile position is located, and on the basis of applying technical measures such as hammering, static pressure and the like to a certain degree, the precast pile enters a preset position.

Compared with the existing common square pile, the variable cross-section square pile has the advantages that the consumption of concrete is reduced, the friction between the pile body and the surrounding soil body or cement soil is improved, and the uplift bearing performance is improved to a certain extent. The variable cross-section square pile is implanted into the mixing pile, the cement soil has contractibility after being solidified, and a gap is formed between the contracted variable cross-section square pile and the outer wall of the variable cross-section square pile, so that the improvement of the relative friction between the variable cross-section square pile and the mixing pile is limited, and the anti-pulling bearing performance of the variable cross-section square pile is required to be enhanced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a strong composite pile foundation, which is used for improving the bonding strength of a precast pile and a mixing pile and improving the integral tensile bearing performance.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

the utility model provides a powerful composite pile basis, including the stirring stake with implant in precast pile in the stirring stake, the precast pile sets up an at least thin section of stake and an at least thick section of stake in turn along length direction, and at least one of them thick section of stake has an at least mounting groove, install bonding piece in the mounting groove, bonding piece stores the sticky material that can escape when receiving the extrusion.

Compared with the prior art, the utility model has the beneficial effects that: when the precast pile was implanted in the stirring stake, the cement soil of precast pile one side formed the extrusion to the bonding piece in the mounting groove, lead to the adhesive material who stores in the bonding piece to escape, adhesive material bonds precast pile and cement soil, can improve the joint strength of precast pile and stirring stake, improve tensile bearing capacity, in addition, cement soil is when the extrusion to the bonding piece in the mounting groove, in cement soil can get into the mounting groove, stirring stake after the consolidation forms the interlock state with the precast pile, further improve tensile bearing capacity.

Furthermore, the above strong composite pile foundation also has the following characteristics: when the bonding piece is not extruded, the outer wall surface of the bonding piece is flush with the outer wall surface of the thick pile section;

or when the bonding piece is not extruded, the outer wall surface of the bonding piece is inwards concave to the outer wall surface of the thick pile section.

Furthermore, the above strong composite pile foundation also has the following characteristics: the maximum width of the notch of the mounting groove in the longitudinal direction is smaller than the maximum width of the mounting groove, and the bonding piece is embedded in the mounting groove;

or at least part of the cross section of the mounting groove is in a dovetail shape or a T shape or an L shape.

Furthermore, the above strong composite pile foundation also has the following characteristics: the mounting grooves are annular grooves circumferentially arranged around the thick pile section, or a plurality of mounting grooves are circumferentially arranged at intervals on the thick pile section;

or the bonding piece is bonding cotton stored with adhesive materials, or at least part of the bonding piece is made of elastic materials.

Furthermore, the above strong composite pile foundation also has the following characteristics: the thick pile section comprises a uniform-section pile body with the same diameter as the thin pile section and more than two hoop members which are sequentially connected end to form hoops on the uniform-section pile body, the end parts of adjacent hoop members are fixedly connected through at least one connecting assembly, and the uniform-section pile body and at least one hoop member are provided with connecting assemblies capable of fixing the hoop members on the uniform-section pile body.

Furthermore, the above strong composite pile foundation also has the following characteristics: the connecting assembly comprises a first nut sleeve and a second nut sleeve, the second nut sleeve is provided with an insert rod, one end of the insert rod, far away from the second nut sleeve, is provided with a reducing plug-in connector which can extend into the first nut sleeve, and a backstop capable of reversibly blocking the reducing plug-in connector is arranged in the first nut sleeve;

or the connecting components for connecting two adjacent hoop members are arranged in the middle of the end parts of the hoop members, or a plurality of the connecting components are arranged at equal intervals on the end parts of the hoop members;

or the connecting components for connecting the pile body and the hoop member are arranged at the center of the hoop member, or a plurality of connecting components are uniformly arranged on the hoop member;

or an adhesive and/or a curing agent is coated between the inner wall surface of the hoop member and the outer wall surface of the equal-section pile body.

Furthermore, the above strong composite pile foundation also has the following characteristics: the precast pile both ends are fixed with a plurality of connecting sleeves that correspond with the main muscle and be connected, the inserted bar is installed to the connecting sleeve of precast pile wherein one end, the inserted bar forms the reducing bayonet joint in the one end of keeping away from connecting sleeve, be equipped with the stopping ware that can reverse to block the reducing bayonet joint in the connecting sleeve of precast pile other end, it is adjacent during the precast pile butt joint, the inserted bar inserts the connecting sleeve of adjacent precast pile to this connecting sleeve's stopping ware reverse blocks the reducing bayonet joint.

Furthermore, the above strong composite pile foundation also has the following characteristics: one end of each precast pile is provided with a concave platform which is concave towards the interior of the precast pile, the other end of each precast pile is provided with a boss which is convex towards the exterior of the precast pile, the shape and the size of the concave platform and the boss are matched, when the two precast piles are close to each other, the boss on one precast pile can be inserted into the concave platform on the other precast pile so as to form clamping fit;

the tip parcel at precast pile both ends has the angle bead cover, just the precast pile has the angle bead cover width of concave station one end to be greater than the degree of depth of concave station.

Furthermore, the above strong composite pile foundation also has the following characteristics: a plurality of convex rib plates are arranged on the outer wall surface of the thin pile section, and the length direction of the rib plates is consistent with that of the precast pile;

in the cross section of the thin pile section, the maximum straight-line distance from the outer end face of the rib plate to the central axis of the precast pile is L1, in the cross section of the thick pile section, the minimum straight-line distance from the outer wall face of the thick pile section to the central axis of the precast pile is L2, and the minimum straight-line distance L2 is greater than the maximum straight-line distance L1.

Furthermore, the above strong composite pile foundation also has the following characteristics: the outer end face of the rib plate is an arc face, or the outer end face of the rib plate and the side wall face are in arc transition.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a precast pile according to an embodiment of the present invention;

fig. 2 is a front view of another precast pile according to an embodiment of the present invention;

FIG. 3 is a schematic view of a hoop component assembly according to an embodiment of the present invention;

figure 4 is a schematic view of a hoop component according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a connection assembly in an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a portion of an embodiment of the utility model after the adhesive has been installed;

fig. 7 is a cross-sectional view of a portion of an embodiment of the utility model with the adhesive member uninstalled.

Reference numerals: 1. prefabricating a pile; 10. a thin pile section; 20. a thick pile section; 21. mounting grooves; 22. a hoop member; 30. an adhesive member; 41. a first nut socket; 42. a second nut socket; 43. inserting a rod; 44. a backstop device; 51. a connecting sleeve; 61. a concave platform; 62. a boss; 70. a corner protecting sleeve; 80. a rib plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.

In this specification, terms such as "upper, lower, inner, and outer" are established based on positional relationships shown in the drawings, and the corresponding positional relationships may vary depending on the drawings, and therefore, the terms are not to be construed as absolutely limiting the scope of protection; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The first embodiment,

Referring to fig. 1 and 6, the present embodiment provides a strong composite pile foundation, including a mixing pile and a precast pile 1 implanted in the mixing pile, where the precast pile 1 is alternately provided with at least one thin pile section 10 and at least one thick pile section 20 along a length direction, at least one thick pile section 20 has at least one mounting groove 21, an adhesive member 30 is installed in the mounting groove 21, and the adhesive member 30 stores an adhesive material capable of escaping when being squeezed.

Precast pile 1 is prefabricated in advance according to the engineering needs in the mill and is accomplished the back, transports to the construction site, and precast pile 1 can be solid tubular pile, hollow tubular pile, solid square pile, hollow square pile, solid polygon stake, hollow polygon stake etc.. When the strong composite pile foundation is constructed, a mixing pile is formed at a preset position through a mixing pile machine, the precast pile 1 is implanted into the mixing pile, and the concrete pile implanting method is not particularly limited.

When mixing pile is implanted to precast pile 1 in, the cement soil of 1 one side of precast pile forms the extrusion to bonding piece 30 in the mounting groove 21, lead to the adhesive material who stores in the bonding piece 30 to escape, adhesive material bonds precast pile 1 and cement soil, can improve the bonding strength of precast pile 1 and mixing pile, improve tensile bearing capacity, in addition, cement soil is when the extrusion to bonding piece 30 in the mounting groove 21, cement soil can get into in the mounting groove 21, mixing pile after the consolidation forms the interlock state with precast pile 1, further improve tensile bearing capacity. In addition, the installation groove 21 is arranged on the thick pile section 20, so that the influence of the too short diameter of the precast pile 1 at the installation groove 21 on the shearing resistance and tensile strength of the precast pile 1 can be avoided.

Example II,

In the present embodiment, the same portions as those in the first embodiment are given the same reference numerals, and the same description is omitted.

Referring to fig. 1 to 7, the present embodiment provides a strong composite pile foundation with a different structural design from the first embodiment:

when the bonding piece 30 is not extruded, the outer wall surface of the bonding piece 30 is flush with the outer wall surface of the thick pile section 20, so that the bonding piece 30 is prevented from moving out of the mounting groove 21 and being separated from the precast pile 1 due to friction force when the precast pile 1 is contacted with cement soil in the process of implanting the mixing pile. Or, when the bonding piece 30 is not extruded, the outer wall surface of the bonding piece 30 is recessed in the outer wall surface of the thick pile section 20, the bonding piece 30 is completely positioned in the installation groove 21 and is not easy to separate, so that the bonding piece 30 is prevented from being moved out of the installation groove 21 by friction force to separate from the precast pile 1 when the precast pile 1 is implanted into a mixing pile and is contacted with cement soil, the cement soil can enter the installation groove 21, the mixing pile after consolidation and the precast pile 1 form an occlusion state, and the tensile bearing performance is further improved.

Referring to fig. 6 and 7, the contour of the adhesive member 30 is matched with the contour of the mounting groove 21, the maximum width of the notch of the mounting groove 21 in the longitudinal direction is smaller than the maximum width of the mounting groove 21, that is, the mounting groove 21 has the characteristics of wide groove and narrow notch, the adhesive member 30 is embedded in the mounting groove 21, and the adhesive member 30 is prevented from falling off from the groove during pile planting construction. Or, at least part of the cross section of the installation groove 21 is in a dovetail shape, a T shape or an L shape, and after the bonding piece 30 is installed in the installation groove 21, at least part of the bonding piece is clamped in the installation groove 21.

Referring to fig. 1, the installation groove 21 is an annular groove circumferentially arranged around the thick pile section 20, that is, the adhesive member 30 is also arranged around the pile body, and as shown in fig. 2, a plurality of installation grooves 21 may also be arranged at intervals circumferentially on the thick pile section 20, and the installation grooves 21 are specifically set according to the amount of the adhesive member 30 required, and are not particularly limited.

Bonding piece 30 is for storing the bonding cotton of sticky material, and the bonding cotton receives when extrudeing, stores and can escape with the sticky material in it, and then flows to between precast pile 1 and the stirring stake, bonds precast pile 1 and stirring stake, improves the bonding strength of precast pile 1 and stirring stake.

Or, the bonding piece 30 is made of an elastic material at least, and when the portion made of the elastic material is extruded, the adhesive material stored in the portion and the adhesive material in the portion can escape, and then the adhesive material flows between the precast pile 1 and the mixing pile to bond the precast pile 1 and the mixing pile, so that the bonding strength of the precast pile 1 and the mixing pile is improved.

Example III,

In this embodiment, the same portions as those in the first and second embodiments are given the same reference numerals, and the same description is omitted.

Referring to fig. 1 to 7, compared to the first and second embodiments, the strong composite pile foundation provided by this embodiment further has such a different structural design:

referring to fig. 3 and 4, the thick pile section 20 includes a constant-section pile body with a constant diameter equal to that of the thin pile section 10 and more than two hoop members 22 connected end to hoop on the constant-section pile body, the ends of adjacent hoop members 22 are connected and fixed by at least one connecting component, and the constant-section pile body and at least one hoop member 22 are provided with connecting components capable of fixing the hoop members 22 on the constant-section pile body. The hoop member 22 is fixed on the equal-section pile body to form the thick pile section 20 and the thin pile section 10, namely when the precast pile 1 is manufactured, the equal-section pile and the hoop member 22 can be respectively prefabricated, the variable-section precast pile 1 with the concave-convex outer wall can be manufactured without adopting a special integrated forming die, the requirement on the die is reduced, and the manufacturing difficulty is reduced.

Referring to fig. 5, the connection assembly includes a first nut sleeve 41 and a second nut sleeve 42, an insertion rod 43 is installed on the second nut sleeve 42, a reducing insertion head capable of extending into the first nut sleeve 41 is formed at one end of the insertion rod 43 far away from the second nut sleeve 42, and a retainer 44 capable of reversibly locking the reducing insertion head is arranged in the first nut sleeve 41. Specifically, the steel bar in the hoop member 22 is fixedly connected to the first nut sleeve 41 and/or the second nut sleeve 42, both the first nut sleeve 41 and the second nut sleeve 42 are provided with steel bar upset clamping platforms, the steel bar in the hoop member 22 is clamped on the steel bar upset clamping platforms, or the first nut sleeve 41 and/or the second nut sleeve 42 are respectively fixed to the steel bar by screwing.

The first nut sleeve 41 and the second nut sleeve 42 of the connecting assembly at the end part of the adjacent hoop member 22 are respectively and fixedly arranged at two ends of the hoop member 22, the reducing plug-in connector of the plug-in rod 43 on the second nut sleeve 42 is inserted into the first nut sleeve 41 to be matched and clamped with the backstop 44, so that the adjacent hoop member 22 is butted, the butted hoop member 22 is tightly hooped on the pile body with the same cross section, the butt joint operation of the adjacent hoop member 22 is simple and convenient, and the butt joint speed is improved.

A first nut sleeve 41 and a second nut sleeve 42 of a connecting component between the pile body with the equal cross section and the hoop member 22 are fixedly arranged on the hoop member 22 and the pile body with the equal cross section respectively, and the reducing plugging head of the plugging rod 43 on the second nut sleeve 42 is inserted into the first nut sleeve 41 to be matched and clamped with the backstop 44, so that the hoop member 22 is fixed on the pile body with the equal cross section, the fixing operation of the hoop member 22 is simple and convenient, and the operation speed is improved.

The connecting component for connecting the two adjacent hoop members 22 is arranged at the middle position of the end parts of the hoop members 22, and the middle position enables the two adjacent hoop members 22 to be stably connected while saving materials; alternatively, a plurality of hoop members 22 may be provided at equal intervals at the ends thereof to enhance the coupling effect between the hoop members 22.

The connecting component for connecting the pile body and the hoop member 22 is arranged at the central position of the hoop member 22, and the connecting component is arranged at the central position so as to ensure that the hoop member 22 is firmly fixed on the pile body with the same section while saving materials; or a plurality of hoop members 22 can be uniformly arranged, so that the connecting effect is enhanced, and the falling off of the hoop members 22 is further avoided.

And an adhesive and/or a curing agent is coated between the inner wall surface of the hoop member 22 and the outer wall surface of the equal-section pile body, so that the hoop member 22 is stably and fixedly arranged on the equal-section pile body.

The hoop member 22 is formed with a die-drawing surface in the longitudinal direction of the uniform-section pile body to facilitate the die-removal of the hoop member 22.

Example four,

In this embodiment, the same portions as those in the first, second, and third embodiments are given the same reference numerals, and the same description is omitted.

See fig. 1-7. Compared with the first, second and third embodiments, the strong composite pile foundation provided by the embodiment also has the following different structural design:

referring to fig. 5, a plurality of connecting sleeves 51 correspondingly connected with the main bars are fixed at two ends of the precast pile 1, an inserting rod 43 is installed on the connecting sleeve 51 at one end of the precast pile 1, a reducing inserting joint is formed at one end of the inserting rod 43 far away from the connecting sleeve 51, a retaining device 44 for reversibly retaining the reducing inserting joint is arranged in the connecting sleeve 51 at the other end of the precast pile 1, when the adjacent precast piles 1 are butted, the inserting rod 43 is inserted into the connecting sleeve 51 of the adjacent precast pile 1, and the retaining device 44 of the connecting sleeve 51 reversely retains the reducing inserting joint. Specifically, be equipped with the steel reinforcement cage in the precast pile 1, the steel reinforcement cage include a plurality of longitudinal reinforcement and with longitudinal reinforcement fixed connection be spiral reinforcing bar, the both ends of longitudinal reinforcement are equipped with the pier nose that the external diameter is greater than longitudinal reinforcement, connecting sleeve 51's bottom is reduced and is formed the ka tai that can block the pier nose, thereby make the both ends of every longitudinal reinforcement taut connecting sleeve 51 respectively, connecting sleeve 51 encircles the even distribution in the central axis interval of precast pile 1, and inside whole precast pile 1, connecting sleeve 51 sinks into 1 inside settlement distance of precast pile from 1 terminal surface of precast pile along axial direction, thereby form hollow connector between the tip that makes connecting sleeve 51 and precast pile 1.

Referring to fig. 1 and 2, one end of each precast pile 1 is provided with a concave platform 61 which is concave towards the interior of each precast pile 1, the other end of each precast pile 1 is provided with a convex platform 62 which is convex towards the exterior of each precast pile 1, and the shape and the size of the concave platform 61 and the convex platform 62 are matched, when two precast piles 1 are close to each other, the convex platform 62 on one precast pile 1 can be inserted into the concave platform 61 on the other precast pile 1 to form a clamping fit, so that when adjacent precast piles 1 are butted, the concave platforms 61 and the convex platforms 62 of the adjacent precast piles 1 form a guiding fit connection structure, the adjacent precast piles 1 are butted accurately, and preferably, the connection sleeve 51 is arranged around the concave platforms 61 or the convex platforms 62.

Referring to fig. 1, the end portions of the two ends of the precast pile 1 are wrapped with the corner protection sleeves 70, the width of the corner protection sleeve 70 at the end of the precast pile 1 with the concave platform 61 is greater than the depth of the concave platform 61, and the arrangement of the corner protection sleeve 70 can enhance the strength of the pile end and avoid the damage of the pile head.

Referring to fig. 2, a plurality of convex rib plates 80 are arranged on the outer wall surface of the thin pile section 10, and the length direction of the rib plates 80 is consistent with the length direction of the precast pile 1, so as to enhance the specific surface area of the outer wall of the thin pile section 10, so that more contact areas exist between the thin pile section 10 and the surrounding cement soil, the uplift bearing performance of the precast pile 1 can be enhanced, and the performance of the strong composite pile foundation is further improved.

In the cross section of the thin pile section 10, the maximum straight-line distance from the outer end face of the rib plate 80 to the central axis of the precast pile 1 is L1, in the cross section of the thick pile section 20, the minimum straight-line distance from the outer wall face of the thick pile section 20 to the central axis of the precast pile 1 is L2, and the minimum straight-line distance L2 is greater than the maximum straight-line distance L1. That is, the minimum linear distance from the outer wall surface of the thick pile section 20 to the central axis of the precast pile 1 is greater than the maximum linear distance from the outer end surface of the rib plate 80 to the central axis of the precast pile 1, so that the surrounding cement soil of the thin pile section 10 can be ensured to surround into an integral structure, and the surrounding cement soil can be attached to the outer wall surface of the thin pile section 10 more tightly, therefore, more contact areas and more tight attaching effect between the thin pile section 10 and the surrounding cement soil can be achieved, the friction force between the pile body and the mixing pile can be improved, and the pulling resistance and bearing performance of the precast pile 1 can be greatly enhanced.

The outer end face of the rib plate 80 is an arc face, or the outer end face of the rib plate 80 and the side wall face are in arc transition, so that the precast pile 1 is prevented from being difficult to demould during manufacturing, and the rib plate 80 on the precast pile 1 is prevented from being easily damaged by collision during conveying.

The above is only a preferred embodiment of the present invention, and the scope of the present invention is defined by the appended claims, and several modifications and amendments made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as the scope of the present invention.

Claims (10)

1. The utility model provides a powerful composite pile basis, including the stirring stake with implant in precast pile (1) in the stirring stake, precast pile (1) sets up at least a thin section of pile (10) and at least a thick section of pile (20) along length direction in turn, its characterized in that, at least one of them thick section of pile (20) have at least one mounting groove (21), install bonding member (30) in mounting groove (21), bonding member (30) are stored and are had the adhesive material that can escape when receiving the extrusion.

2. The strong composite pile foundation of claim 1, wherein the outer wall surface of the bonding member (30) is flush with the outer wall surface of the thick pile section (20) when the bonding member (30) is not pressed;

or when the bonding piece (30) is not extruded, the outer wall surface of the bonding piece (30) is recessed in the outer wall surface of the thick pile section (20).

3. The strong composite pile foundation according to claim 1, wherein the maximum width of the notch of the installation groove (21) in the longitudinal direction is smaller than the maximum width of the installation groove (21), and the bonding member (30) is embedded in the installation groove (21);

or at least part of the cross section of the mounting groove (21) is in a dovetail shape or a T shape or an L shape.

4. The strong composite pile foundation of claim 1, wherein the installation groove (21) is an annular groove circumferentially arranged around the thick pile section (20), or the thick pile section (20) is circumferentially provided with a plurality of installation grooves (21) at intervals;

or the bonding piece (30) is bonding cotton stored with adhesive materials, or at least part of the bonding piece (30) is made of elastic materials.

5. The strong composite pile foundation of claim 1, wherein the thick pile section (20) comprises a uniform-section pile body with a uniform diameter with the thin pile section (10) and more than two hoop members (22) connected end to end in sequence to hoop on the uniform-section pile body, the ends of the adjacent hoop members (22) are connected and fixed by at least one connecting assembly, and the uniform-section pile body and at least one hoop member (22) are provided with connecting assemblies capable of fixing the hoop members (22) on the uniform-section pile body.

6. The strong composite pile foundation of claim 5, wherein the connecting assembly comprises a first nut sleeve (41) and a second nut sleeve (42), the second nut sleeve (42) is provided with an insert rod (43), one end of the insert rod (43) far away from the second nut sleeve (42) is provided with a reducing plug which can extend into the first nut sleeve (41), and a retainer (44) which can reversibly clamp the reducing plug is arranged in the first nut sleeve (41);

or the connecting components for connecting two adjacent hoop members (22) are arranged at the middle position of the end parts of the hoop members (22), or a plurality of connecting components are arranged at equal intervals at the end parts of the hoop members (22);

or the connecting component for connecting the pile body and the hoop member (22) is arranged at the center of the hoop member (22), or a plurality of connecting components are uniformly arranged on the hoop member (22);

or an adhesive and/or a curing agent is coated between the inner wall surface of the hoop member (22) and the outer wall surface of the equal-section pile body.

7. The strong composite pile foundation of claim 1, wherein a plurality of connecting sleeves (51) correspondingly connected with the main bars are fixed at two ends of the precast pile (1), an inserting rod (43) is installed on the connecting sleeve (51) at one end of the precast pile (1), a reducing inserting joint is formed at one end, away from the connecting sleeve (51), of the inserting rod (43), a backstop (44) capable of reversibly clamping the reducing inserting joint is arranged in the connecting sleeve (51) at the other end of the precast pile (1), when the adjacent precast piles (1) are in butt joint, the inserting rod (43) is inserted into the connecting sleeve (51) of the adjacent precast pile (1), and the backstop (44) of the connecting sleeve (51) reversely clamps the reducing inserting joint.

8. The strong composite pile foundation of claim 1, wherein one end of the precast pile (1) is provided with a concave platform (61) which is concave towards the interior of the precast pile (1), the other end of the precast pile (1) is provided with a convex platform (62) which is convex towards the exterior of the precast pile (1), the shape and the size of the concave platform (61) and the convex platform (62) are matched, when two precast piles (1) are close to each other, the convex platform (62) on one precast pile (1) can be inserted into the concave platform (61) on the other precast pile (1) to form a clamping fit;

the end portions of the two ends of the precast pile (1) are wrapped with corner protection sleeves (70), and the width of the corner protection sleeve (70) with one end provided with the concave table (61) in the precast pile (1) is larger than the depth of the concave table (61).

9. The strong composite pile foundation of claim 1, wherein a plurality of convex ribs (80) are arranged on the outer wall surface of the thin pile section (10), and the length direction of the ribs (80) is consistent with the length direction of the precast pile (1);

in the cross section of the thin pile section (10), the maximum straight-line distance from the outer end face of the rib plate (80) to the central axis of the precast pile (1) is L1, in the cross section of the thick pile section (20), the minimum straight-line distance from the outer wall face of the thick pile section (20) to the central axis of the precast pile (1) is L2, and the minimum straight-line distance L2 is greater than the maximum straight-line distance L1.

10. The strong composite pile foundation of claim 9, wherein the outer end face of the rib (80) is a circular arc face, or the outer end face and the side wall face of the rib (80) are in circular arc transition.

Images