CN217974325U - Built-in high swelling material is from prefabricated tubular pile structure who enlarges pile shoe - Google Patents

Abstract

The utility model discloses a built-in high expanding material is from prefabricated tubular pile structure who enlarges pile shoe belongs to the construction equipment field. The utility model discloses set up in precast tubular pile bottom from enlarging the pile shoe, should evenly seted up the vallecular cavity of filling expanding material along the hoop in enlarging the pile shoe on the outer peripheral face of pile shoe main part, but articulated the annular slab that can expand diameter on the outer peripheral face of pile shoe main part simultaneously, thereby utilize the water expanded principle of high expanding material to prop open the annular slab that can expand diameter and realize expanding diameter, finally form the first structure of expanding of the round platform form of falling. Meanwhile, grouting slurry is further filled in the diameter-expandable annular plate through the pre-buried pipeline, after the grouting slurry is solidified, radial support for the diameter-expandable annular plate is formed, and the diameter of the diameter-expandable annular plate can be kept unchanged when the diameter-expandable annular plate is loaded, so that the bearing capacity and the pulling resistance of the precast tubular pile are improved. The structure can be applied to precast piles made of various materials such as concrete piles, steel piles and the like, can effectively reduce differential settlement of buildings and improve the uplift resistance.

Description

Prefabricated tubular pile structure with built-in high-expansion material and self-expanding pile shoe

Technical Field

The utility model belongs to the construction equipment field, concretely relates to built-in high expansion material is from prefabricated tubular pile structure who enlarges pile shoe.

Background

Along with the gradual acceleration of urbanization construction pace, municipal infrastructure, bridges, various buildings and other specifications are getting bigger and bigger. In coastal areas, because deep and thick soft soil layers are widely distributed, the requirement on the bearing capacity of the foundation is higher than that of other areas.

The application range of the precast tubular pile is more and more extensive in recent years, on one hand, the cost is reduced to a great extent due to the advantages of streamlined manufacturing, convenient transportation, quick construction and the like; on the other hand, the club-footed pile plays a good technical and economic effect in actual engineering, the bearing capacity of a single pile is greatly improved compared with that of a straight pile with the same diameter of the pile body, the club-footed pile has higher uplift resistance, the deformation of the club-footed pile under the action of earthquake force is small, and the stability is good. However, in general, the club-footed pile is called a club-footed cast-in-place pile, which is formed by forming an enlarged head at the bottom of a pile body through special equipment on the basis of the original constant-section cast-in-place pile. However, such an enlarged head can only be used for cast-in-place piles, and is prefabricated and cannot be adjusted in diameter in different projects according to actual conditions.

For other prefabricated tubular piles, how to form a tubular pile structure with an enlarged head and realize flexible control of the diameter of the enlarged head is a technical problem to be solved at present.

Disclosure of Invention

An object of the utility model is to solve among the prior art precast tubular pile and can't realize the problem of the unable nimble control of enlarged footing and enlarged footing diameter to a precast tubular pile structure of built-in high inflation material from enlarging pile shoe is provided.

The utility model discloses the concrete technical scheme who adopts as follows:

a precast tubular pile structure with a built-in high-expansion material self-expansion pile shoe comprises a precast tubular pile, a self-expansion pile shoe and a liquid injection pipeline;

the self-expanding pile shoe comprises a pile shoe main body, a pile shoe tip, an embedded pipeline, an in-pipe limiting ring, an out-pipe limiting ring and an expandable annular plate; the tip end of the pile shoe is positioned at the bottom of the pile shoe main body, and the top surface of the pile shoe main body is a plane; the inner limiting ring and the outer limiting ring are coaxially arranged on the top surface of the pile shoe main body; the top surface of the pile shoe main body is clamped by an outer limiting ring and an inner limiting ring to form a pile end bearing surface; a plurality of groove cavities are uniformly formed in the peripheral surface of the pile shoe main body along the circumferential direction, and each groove cavity is filled with an expansion material capable of absorbing water and expanding; the embedded pipeline is arranged in the pile shoe main body, the inlet end of the embedded pipeline is communicated with the inner cavity of the limiting ring in the pipe, and the outlet end of the embedded pipeline is communicated with each slot cavity;

the diameter-expandable annular plate is arranged on the outer peripheral surface of the pile shoe main body in a surrounding mode, and the bottom of the diameter-expandable annular plate is hinged with the pile shoe main body; the plate body of the annular plate capable of expanding the diameter is formed by alternately splicing a plurality of fixed plates and folding assemblies, a folding assembly is arranged between any two fixed plates, each folding assembly comprises two folding plates and three articulated elements, the inner sides of the two folding plates are rotatably connected through one articulated element, and the outer sides of the two folding plates are respectively rotatably connected with the fixed plate on the side through one articulated element; each folding assembly on the annular plate capable of expanding diameter has two folding forms and an unfolding form, wherein two folding plates are folded in an annular space between the fixing plate and the outer peripheral surface of the pile shoe main body in the folding form, and are unfolded flatly and positioned on the side surface of the same inverted circular truncated cone with the fixing plate in the unfolding form;

the self-enlarging pile shoe is assembled on the bottom pile end of the prefabricated pipe pile;

annotate the liquid pipeline and arrange along precast tubular pile's inner chamber axial, and communicate pre-buried pipeline's entry end.

Preferably, in the annular plate capable of expanding the diameter, the fixed plate is in an inverted isosceles trapezoid shape, the folding plates are in a right-angled triangle shape, the two folding plates are spliced into the inverted isosceles triangle shape, and the waist length of the isosceles trapezoid is equal to that of the isosceles triangle; the fixed plates and the folding plates are spliced through waist edges, and the bottoms of all the fixed plates are attached and fixed on the outer peripheral surface of the pile shoe main body through hinge pieces; the folding assemblies in the annular plate capable of expanding diameter are initially in a folding state, and are laid down outwards and expanded when being subjected to thrust along the radial direction of the precast tubular pile and are converted into an unfolding state, so that the diameter of the top of the annular plate capable of expanding diameter is expanded.

Preferably, the hinge member is a hinge connection.

Preferably, the top of the annular expandable plate is adjacent to the outer periphery of the shoe body when all of the folded assemblies in the annular expandable plate are in the folded configuration.

Preferably, the self-expanding shoe is made of a rigid metal material.

Preferably, the precast tubular pile is a concrete pile or a steel pile.

Preferably, the liquid injection pipeline extends downwards from the pile top of the precast tubular pile and is inserted into the limiting ring in the pipe.

Preferably, the outer diameter of the outer pipe limiting ring is consistent with the outer diameter of the pile shoe main body, the inner diameter of the outer pipe limiting ring is consistent with the outer diameter of the precast tubular pile, and the precast tubular pile and the outer pipe limiting ring form clearance fit or transition fit.

Preferably, the outer diameter of the limiting ring in the pipe is smaller than the diameter of the inner cavity of the precast pipe pile, and the inner diameter of the limiting ring is consistent with the outer diameter of the liquid injection pipeline.

Preferably, the swelling material is a water-absorbent resin.

Compared with the prior art, the utility model, following beneficial effect has:

the utility model discloses set up in precast tubular pile bottom from enlarging the pile shoe, should evenly seted up the vallecular cavity of filling expanding material along the hoop in enlarging the pile shoe on the outer peripheral face of pile shoe main part, but articulated the annular slab that can expand diameter on the outer peripheral face of pile shoe main part simultaneously, thereby utilize the water expanded principle of high expanding material to prop open the annular slab that can expand diameter and realize expanding diameter, finally form the first structure of expanding of the round platform form of falling. Meanwhile, grouting slurry is further filled in the diameter-expandable annular plate through the pre-buried pipeline, after the grouting slurry is solidified, radial support for the diameter-expandable annular plate is formed, and the diameter of the diameter-expandable annular plate can be kept unchanged when the diameter-expandable annular plate is loaded, so that the bearing capacity and the pulling resistance of the precast tubular pile are improved. The structure can be applied to precast piles made of various materials such as concrete piles, steel piles and the like, can effectively reduce differential settlement of buildings and improve the uplift resistance.

Drawings

Fig. 1 is a schematic view of a precast tubular pile structure with a built-in self-expanding pile shoe made of high-expansion material;

FIG. 2 is a schematic structural view of a self-expanding shoe;

FIG. 3 isbase:Sub>A schematic sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is an enlarged view of the position C in FIG. 4;

fig. 6 is a schematic diagram of a key construction link of a precast tubular pile structure with a self-expanding pile shoe containing a high-expansion material.

The reference numbers in the figures are: the pile comprises a precast tubular pile 1, a self-expanding pile shoe 2, a liquid injection pipeline 3, a pile shoe main body 201, an in-pipe limiting ring 202, an out-pipe limiting ring 203, an embedded pipeline 204, an expansion material 205, an expandable annular plate 206, a fixing plate 261, a folding plate 262 and a hinge 263.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention. The utility model discloses technical characteristics in each embodiment are under the prerequisite that does not conflict each other, all can carry out corresponding combination.

In the description of the present invention, it will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element, i.e., intervening elements may be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

As shown in fig. 1, in a preferred embodiment of the present invention, a precast tubular pile structure with built-in high expansion material self-enlarging pile shoe is provided, and its basic structural units include a precast tubular pile 1, a self-enlarging pile shoe 2 and a liquid injection pipeline 3. The specific structures of the precast tubular pile 1, the self-enlarging pile shoe 2 and the liquid injection pipeline 3 are described in detail below.

As shown in fig. 2, fig. 3 and fig. 4, the self-enlarging pile shoe 2 is a core structure of the present invention, which plays a role of pile tip bearing capacity, and the self-enlarging pile shoe 2 includes a pile shoe main body 201, a pile shoe tip 207, a pre-buried pipe 204, an in-pipe limiting ring 202, an out-pipe limiting ring 203 and an expandable annular plate 206. The shoe tip 207 is located at the bottom of the shoe body 201 and the top surface of the shoe body 201 is planar. The inner limiting ring 202 and the outer limiting ring 203 are coaxially arranged on the top surface of the pile shoe main body 201, and the top surface of the pile shoe main body 201 is clamped by the outer limiting ring 203 and the inner limiting ring 202 to form a pile end bearing surface. The precast tubular pile 1 can be inserted into the outer limiting ring 203, and the pile end bottom surface of the precast tubular pile 1 is supported at the pile end bearing surface on the top surface of the pile shoe main body 201.

It should be noted that the inner limiting ring 202, the outer limiting ring 203, the shoe tip 207 and the shoe main body 201 may be made of steel, or may be made of reinforced concrete. However, it should be noted that the inner limiting ring 202, the outer limiting ring 203, the pile shoe tip 207 and the pile shoe main body 201 may be integrally cast when they are made of reinforced concrete material, or may be integrally formed when they are made of steel material, and they are not necessarily divided into two separate parts.

The pile shoe main body 201 is cylindrical as a whole, and a plurality of grooves are uniformly formed in the circumferential surface of the pile shoe main body 201 along the circumferential direction. Each of the chambers is filled with a water-swellable intumescent material 205. The specific size and number of the cavities can be adjusted according to actual needs, and in the section of the pile shoe main body 201 shown in fig. 4, a total of 18 cavities are formed on the outer peripheral surface of the pile shoe main body 201, and each cavity is filled with the expansion material 205. The specific form of the swelling material 205 is not limited as long as it can swell after absorbing water, and a water Absorbent resin (SAP) is preferably used in the present embodiment. The water-absorbing resin is a novel functional polymer material. It has a high water-absorbing function of absorbing water several hundred to several thousand times heavier than itself, and is excellent in water retention property, and once it swells to form hydrogel upon water absorption, it is difficult to separate water even under pressure. In order to fill the expansion material 205 in the slot cavity with water, a pre-buried pipeline 204 can be built in the pile shoe main body 201 in advance, the inlet end of the pre-buried pipeline 204 is communicated with the inner cavity of the limiting ring 202 in the pipe, and the outlet end of the pre-buried pipeline 204 is communicated with each slot cavity. The purpose of the filling of the expanding material 205 is to cooperate with the annular plate 206 with an enlarged diameter, and to push the annular plate 206 with an enlarged diameter after pile sinking to form an enlarged head, thereby improving the bearing capacity and the resistance to pulling of the pile body.

In the present invention, the expandable annular plate 206 is a key component for forming an expanded head on the pile body, and is folded onto the outer peripheral surface of the pile shoe main body 201 in an initial state, and can be expanded by using the principle that a high expansion material expands when it is needed to expand, thereby realizing the expansion, and finally forming an expanded head structure in the form of an inverted circular truncated cone. The expandable annular plate 206 must therefore perform the function of expanding the diameter, and since the enlarged head structure is load bearing, it cannot be made of flexible material, but must be made of rigid material. Moreover, in order to achieve flexible control of the diameter of the enlarged head, the expandable annular plate 206 is required to have a function of adjusting the angle and the diameter. The specific implementation and principles of the expandable annular plate 206 are described in detail below.

As shown in fig. 4 and 5, an expandable annular plate 206 is circumferentially arranged on the outer circumferential surface of the shoe body 201, and the bottom of the expandable annular plate 206 is hinged to the shoe body 201. The plate body of the annular plate 206 with the expandable diameter is formed by alternately splicing a plurality of fixing plates 261 and a plurality of folding assemblies, and one folding assembly is arranged between any two fixing plates 261. Each folding assembly comprises two folding plates 262 and three hinges 263. The inner sides of the two folding plates 262 are rotatably connected by a hinge 263, and the outer sides of the two folding plates 262 are rotatably connected with the fixing plate 261 through a hinge 263. Each folding assembly on the expandable annular plate 206 has both a folded and an unfolded configuration. As shown in fig. 3, the folding assembly is schematically shown in the folded configuration, in which the two folding plates 262 are folded into the annular space between the fixed plate 261 and the outer periphery of the pile shoe main body 201, and in the unfolded configuration, the two folding plates 262 are pivoted outwards around the hinge 263, and laid and unfolded to lie on the same side of the inverted circular truncated cone as the fixed plate 261. The maximum diameter after deployment can be adjusted by optimizing the specific shape and size of the fixed plate 261 and the folding plate 262.

In the annular plate 206 with an expandable diameter, the specific shapes of the fixed plate 261 and the folding plate 262 can be adjusted according to the actual situation, so as to ensure that the whole plate body can form the side surface of an inverted circular truncated cone after being finally laid and unfolded. If a complete inverted circular truncated cone side is to be formed, the fixed plate 261 should be a fan-shaped ring, and the two folding plates 262 should be spliced into a fan shape, and the side of the fan-shaped ring is longer than the radius of the fan shape, so that the two fixed plates 261 can just be spliced continuously by filling the two folding plates 262. However, in practical applications, since the arc-shaped plate body is difficult to machine and the subsequent concrete or cement grouting slurry itself has a certain viscosity coefficient, the expandable annular plate 206 does not necessarily have to be a complete inverted circular truncated cone side surface, and the grouting slurry can be accumulated even when there is a gap. In order to facilitate the processing of the plate bodies, in this embodiment, the fixing plate 261 of the diameter-expandable annular plate 206 is an inverted isosceles trapezoid, the folding plates 262 are right-angled triangles, two folding plates 262 are spliced into an inverted isosceles triangle through right-angled sides, and the waist length of the isosceles trapezoid is equal to the waist length of the isosceles triangle. The fixed plate 261 and the folding plate 262 are spliced together through the edge of the waist. The bottom of all the fixed plates 261 is fixed on the outer circumference of the shoe main body 201 by hinges 263, and the folding plates 262 may not be hinged on the outer circumference of the shoe main body 201. In this embodiment, hinge joints may be used for the three hinge parts 263 of the folding assembly and the hinge parts 263 required for the fixing plate 261 to hinge with the pile shoe main body 201. The gaps at the hinged positions are kept as small as possible, and the existence of certain gaps is also allowable as long as the through loss of grouting slurry is avoided.

As shown in fig. 6, the core construction process of the precast pile structure with the built-in high expansion material self-enlarging pile shoe is shown. In an initial state, the self-enlarging pile shoe 2 is assembled on the bottom pile end of the precast tubular pile 1 for pile sinking, and the pile sinking process can adopt a hammering method or a static pressure method. The precast tubular pile 1 can be a precast pile type such as a concrete pile or a steel pile. As shown in a) of fig. 6, after the precast tubular pile 1 is sunk to the target depth, the folding components in the annular expandable plate 206 are all in the folded state initially, and at this time, the top of the annular expandable plate 206 should be as close as possible to the outer circumferential surface of the pile shoe main body 201, so as to reduce the resistance of the self-expandable pile shoe 2 during sinking into the ground. Then, the liquid injection pipeline 3 can axially extend into the inner cavity of the precast tubular pile 1, the bottom of the liquid injection pipeline 3 is inserted into the inner limiting ring 202, and the bottom of the liquid injection pipeline 3 is communicated with the inlet end of the embedded pipeline 204. And injecting water into the liquid injection pipeline 3, wherein the water flows into each slot cavity through the embedded pipeline 204, so that the water-absorbent resin absorbs the water and expands to form hydrogel. The expanded hydrogel expands in volume, overflowing the lumens, and pushing the expandable annular plate 206 to expand radially. As shown in b) of fig. 6, the folding assembly in the annular expandable plate 206 falls and expands outwards when being pushed in the radial direction of the precast tubular pile 1, in the process, two folding plates 262 are unfolded to be on the same circular table surface as the fixed plate 261, and simultaneously, the folding plates 262 and the fixed plate 261 are turned over around the hinged position at the bottom of the fixed plate 261, and finally, the whole annular expandable plate 206 is converted into an unfolded state, so that the diameter of the top of the annular expandable plate 206 is expanded. However, the diameter of the expandable annular plate 206 is enlarged but not enough to carry the load transmitted by the pile body, so it is necessary to provide radial support to the expanded annular plate 206 to prevent it from contracting. At this time, as shown in c) of fig. 6, the grouting slurry in the form of concrete, cement paste, or the like is continuously injected through the injection pipe 3, and the grouting slurry flows into each cavity along the embedded pipe 204, further filling each cavity and the open area of the expandable annular plate 206. After the grouting slurry is cured, radial support for the annular plate 206 with the diameter capable of being expanded is formed, and the diameter of the annular plate 206 with the diameter capable of being expanded can be kept unchanged when the annular plate is loaded, so that the bearing capacity and the pulling resistance of the precast tubular pile 1 are improved.

The whole self-expanding shoe 2 except for the filled expansion material 205 can be made of rigid metal material, specifically steel, iron, aluminum, and preferably steel.

In addition, in order to ensure the tight connection between the precast tubular pile 1 and the injection pipeline 3 and the self-enlarging pile shoe 2, the outer diameter of the outer limiting ring 203 of the pipe is preferably consistent with the outer diameter of the pile shoe main body 201, and the inner diameter is preferably consistent with the outer diameter of the precast tubular pile 1, so that the precast tubular pile 1 and the outer limiting ring 203 of the pipe form clearance fit or transition fit. In addition, the outer diameter of the limiting ring 202 in the pipe needs to be smaller than the diameter of the inner cavity of the precast tubular pile 1, and the inner diameter of the limiting ring is preferably consistent with the outer diameter of the liquid injection pipeline 3, so that the liquid injection pipeline 3 and the limiting ring 202 in the pipe form clearance fit or transition fit. In addition, the injection pipeline 3 can be recovered after being used.

To sum up, the utility model discloses combine the rationale of club-footed pile to precast tubular pile carries out optimal design, utilizes from enlarging pile shoe and form the enlarged footing at precast tubular pile stake end to cast-in-place concrete or cement finally form the club-footed pile. The utility model discloses for conventional club-footed bored concrete pile, construction steps are few, and the time limit for a project is short, can improve the single stake bearing capacity of prestressed pipe pile greatly.

The above-mentioned embodiments are merely a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications can be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the mode of equivalent replacement or equivalent transformation fall within the protection scope of the utility model.

Claims (10)

1. A precast tubular pile structure with a built-in high-expansion material self-enlarging pile shoe is characterized by comprising a precast tubular pile (1), a self-enlarging pile shoe (2) and a liquid injection pipeline (3);

the self-expanding pile shoe (2) comprises a pile shoe main body (201), a pile shoe tip (207), an embedded pipeline (204), an in-pipe limiting ring (202), an out-pipe limiting ring (203) and an annular plate (206) capable of expanding diameter; the pile shoe tip (207) is positioned at the bottom of the pile shoe main body (201), and the top surface of the pile shoe main body (201) is a plane; the inner limiting ring (202) and the outer limiting ring (203) are coaxially arranged on the top surface of the pile shoe main body (201); the top surface of the pile shoe main body (201) is clamped by an outer limiting ring (203) and an inner limiting ring (202) to form a pile end bearing surface; a plurality of groove cavities are uniformly formed in the circumferential surface of the pile shoe main body (201) along the circumferential direction, and each groove cavity is filled with an expansion material (205) capable of absorbing water and expanding; the embedded pipeline (204) is arranged in the pile shoe main body (201), the inlet end of the embedded pipeline is communicated with the inner cavity of the limiting ring (202) in the pipe, and the outlet end of the embedded pipeline is communicated with each slot cavity;

the annular plate (206) capable of expanding diameter is arranged on the outer peripheral surface of the pile shoe main body (201) in a surrounding mode, and the bottom of the annular plate (206) capable of expanding diameter is hinged with the pile shoe main body (201); the plate body of the annular plate (206) capable of expanding the diameter is formed by alternately splicing a plurality of fixed plates (261) and folding assemblies, one folding assembly is arranged between any two fixed plates (261), each folding assembly comprises two folding plates (262) and three hinging elements (263), the inner side edges of the two folding plates (262) are rotatably connected through one hinging element (263), and the outer side edges of the two folding plates (262) are respectively rotatably connected with the fixed plate (261) on the side through one hinging element (263); each folding assembly on the annular plate (206) capable of expanding has a folding state and an unfolding state, wherein two folding plates (262) are folded in an annular space between the fixing plate (261) and the outer peripheral surface of the pile shoe main body (201) in the folding state, and the two folding plates (262) are flatly unfolded and are positioned on the side surface of the same inverted round table with the fixing plate (261) in the unfolding state;

the self-expanding pile shoe (2) is assembled on the bottom pile end of the precast tubular pile (1);

annotate liquid pipeline (3) and arrange along the inner chamber axial of precast tubular pile (1), and communicate the entry end of buried pipeline (204).

2. The precast tubular pile structure of built-in high expansion material self-enlarging pile shoe according to claim 1, characterized in that in the expandable annular plate (206), the fixed plate (261) is in the shape of an inverted isosceles trapezoid, the folding plates (262) are in the shape of right triangles, two folding plates (262) are spliced into an inverted isosceles triangle, and the waist length of the isosceles trapezoid is equal to that of the isosceles triangle; the fixing plates (261) and the folding plates (262) are spliced through waist edges, and the bottoms of all the fixing plates (261) are attached and fixed on the outer peripheral surface of the pile shoe main body (201) through hinges (263); the folding assemblies in the annular expandable plate (206) are initially in a folding state, and are laid down and expanded outwards when being subjected to thrust along the radial direction of the precast tubular pile (1) and are converted into an unfolding state, so that the diameter of the top of the annular expandable plate (206) is expanded.

3. The precast tubular pile structure of built-in high expansion material self-enlarging pile shoe according to claim 1, wherein said hinge member (263) is a hinge connection member.

4. The precast tubular pile structure of built-in high expansion material self-expanding pile shoe according to claim 1, characterized in that the top of the annular expandable plate (206) is adjacent to the outer peripheral surface of the pile shoe body (201) when all the folding components in the annular expandable plate (206) are in the folded configuration.

5. The precast tubular pile structure with built-in self-expanding pile shoe of high expansive material according to claim 1, wherein said self-expanding pile shoe (2) is made of rigid metal material.

6. The precast tubular pile structure of built-in high expansion material self-enlarging pile shoe according to claim 1, characterized in that the precast tubular pile (1) is a concrete pile or a steel pile.

7. The precast tubular pile structure of built-in high expansion material self-enlarging pile shoe according to claim 1, wherein the liquid injection pipe (3) extends downward from the pile top of the precast tubular pile (1) and is inserted into the limiting ring (202) in the pipe.

8. The precast tubular pile structure of built-in high expansion material self-expanding pile shoe according to claim 1, wherein the outer diameter of the outer limiting ring (203) of the pipe is consistent with the outer diameter of the pile shoe main body (201), the inner diameter is consistent with the outer diameter of the precast tubular pile (1), and the precast tubular pile (1) and the outer limiting ring (203) of the pipe form clearance fit or transition fit.

9. The precast tubular pile structure of built-in high expansion material self-enlarging pile shoe according to claim 1, wherein the outer diameter of the limiting ring (202) in the tube is smaller than the diameter of the inner cavity of the precast tubular pile (1), and the inner diameter is consistent with the outer diameter of the liquid injection pipeline (3).

10. The pre-cast tubular pile structure with built-in high expansion material self-enlarging pile shoe as claimed in claim 1, wherein said expansion material (205) is water-absorbent resin.

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