CN204435368U - Prestressed concrete pile - Google Patents

Abstract

A prestressed concrete pile comprises a lower pile unit and at least one upper pile unit connected to each other, and a reinforcing unit inserted and connected to the lower pile unit and the upper pile unit. By using the reinforcing unit inserted into the upper pile unit and the lower pile unit to connect the upper pile body and the lower pile body, the bearing capacity of the lower pile unit and the upper pile unit connected to each other to vertical pressure, tension and horizontal shear force is improved, thereby increasing the structural strength and durability.

Description

Prestressed Concrete Pile

technical field

The utility model relates to a pile type, in particular to a prestressed concrete pile with an inner hole on a longitudinal axis and a reinforcing unit inserted in the inner hole.

Background technique

Prestressed concrete piles can be used in large or important buildings as the substructure to transfer the load of the building to the soil bearing layer or a harder ground to increase the safety and stability of the building structure.

Among the prestressed concrete piles, the prestressed concrete pipe pile is the most commonly used pile type in engineering. Taking prestressed concrete pipe piles as an example here, prestressed concrete piles need to be installed deep into the soil layer to provide sufficient soil bearing capacity. However, most of the existing prestressed concrete piles are prefabricated in factories and then transported to The construction site is buried in the soil layer.

Limited by the length of factory molds and transport vehicles, the existing prestressed concrete piles are generally about 18 meters long. When the length of a single prestressed concrete pile is limited, most of the existing prestressed concrete piles are connected by multi-section prestressed concrete piles. The method of connecting piles is to extend the length of prestressed concrete piles to meet the needs of deep soil layers.

Referring to FIG. 1 , the existing prestressed concrete pile includes an upper pile 11 and a lower pile 12 . The upper pile 11 has an upper tube body 111 made of concrete, and two upper end plates 112 respectively sealed at opposite ends of the upper tube body 111 . The lower pile 12 has a lower tube body 121 made of concrete, and two lower end plates 122 respectively sealed at opposite ends of the lower tube body 121 . The upper end plate 112 and the lower end plate 122 at the upper and lower joints are welded by welding to extend the overall length.

As we all know, the structural strength of the joint between the upper pile 11 and the lower pile 12 is relatively weak, and the welded joint between the upper pile 11 and the lower pile 12 is exposed to underground soil or groundwater for a long time, which is prone to corrosion and affects the joint. Strength and durability. During the service period of prestressed concrete piles from 50 to 100 years, once the upper end plate 112 and the lower end plate 122 of the upper pile 11 and the joint of the lower pile 12 are corroded, the bearing capacity of the prestressed concrete pile will be reduced. loss or loss of power, resulting in damage to buildings. Therefore, how to increase the structural strength and durability of prestressed concrete piles has become the goal of efforts.

Contents of the invention

The purpose of the utility model is to provide a prestressed concrete pile capable of improving structural strength and durability.

The prestressed concrete pile of the utility model comprises a lower pile unit, at least one pile upper unit, and a reinforcement unit. The pile-down unit includes a pile-down body formed with a longitudinally hollow pile-down inner hole. The pile loading unit includes an upper pile body which is mutually engaged with the lower pile body, and the upper pile body is formed with a longitudinally hollow upper pile inner hole communicating with the lower pile inner hole. The reinforcing unit passes through the hollow upper pile inner hole of the upper pile body and the hollow lower pile inner hole of the lower pile body to connect the upper pile body and the lower pile body.

In the prestressed concrete pile described in the utility model, the lower pile body has a lower pipe body which is made of concrete and surrounds and defines the inner hole of the lower pile, and one end connected to the lower pipe body and is made of metal. Material is made and communicates with the ring-shaped lower connector of the lower pipe body, the upper pile body has an upper pipe body made of concrete and surrounds and defines the inner hole of the upper pile, and an upper pipe connected to the upper pipe One end of the body is correspondingly engaged with the lower connecting piece to communicate with the annular upper connecting piece in the inner hole of the lower pile and the inner hole of the upper pile.

In the prestressed concrete pile described in the utility model, the reinforcement unit includes a partition that blocks the end of the lower pipe body opposite to the lower connector.

In the prestressed concrete pile described in the utility model, the reinforcement unit includes a partition that is spaced apart from the lower connector in the inner hole of the lower pile, and the partition divides the inner hole of the lower pile into a A connecting section communicating with the inner hole of the upper pile, and a bottom section separated from the connecting section.

The prestressed concrete pile described in the utility model, the lower pile body also has an annular bottom plate arranged on the end of the lower pipe body opposite to the lower connector and connected to the inner hole of the lower pile, and the reinforcing unit includes A partition is blocked by the annular bottom plate.

In the prestressed concrete pile described in the utility model, the reinforcement unit includes a partition that is spaced apart from the lower connector in the inner hole of the lower pile, and the partition divides the inner hole of the lower pile into a A connecting section communicating with the inner hole of the upper pile, and a bottom section separated from the connecting section.

The prestressed concrete pile described in the utility model, the reinforcement unit also includes a reinforcement cage that penetrates the inner hole of the upper pile and the inner hole of the lower pile, and a steel cage poured into the inner hole of the upper pile and the inner hole of the lower pile. The steel cage has a plurality of vertical steel bars partially or fully protruding from the upper pile body, and a plurality of spacers. A spiral stirrup wound around the vertical reinforcement, and the core-filled concrete is selected from concrete without expansion agent or concrete with expansion agent.

In the prestressed concrete pile described in the utility model, the reinforcement unit includes a filling soil filled in the inner hole of the lower pile, a reinforcement cage penetrating the inner hole of the upper pile and the inner hole of the lower pile, and a pouring core-filled concrete in the inner hole of the upper pile and the inner hole of the lower pile and contacting the filling soil to combine the reinforcement cage with the upper pile body and the lower pile body, the reinforcement cage has a plurality of partial or full protrusions The vertical reinforcement of the upper pile body and a plurality of spiral stirrups wound around the vertical reinforcement at intervals, and the core-filled concrete is selected from concrete without expansion agent or concrete with expansion agent.

Another object of the present invention is to provide a prestressed concrete pile capable of improving structural strength and durability.

The prestressed concrete pile of the utility model comprises a lower pile unit, at least one pile upper unit, and a reinforcement unit. The lower pile unit includes a lower pile body formed with a longitudinal lower pile inner hole, the lower pile body has a lower tube body made of prestressed concrete and surrounds the lower pile inner hole, the lower tube The body has an open end communicating with the inner hole of the lower pile, and a tapered closed end opposite to the open end. The pile loading unit includes an upper pile body which is mutually engaged with the lower pile body, and the upper pile body is formed with a longitudinally hollow upper pile inner hole communicating with the lower pile inner hole. The reinforcing unit passes through the hollow upper pile inner hole of the upper pile body and the hollow lower pile inner hole of the lower pile body to connect the upper pile body and the lower pile body.

In the prestressed concrete pile described in the utility model, the lower pile body also has a ring-shaped lower connecting piece which is connected to the opening end and is made of metal material and communicates with the inner hole of the lower pile. An upper pipe body made of concrete and surrounding the inner hole of the upper pile, and one end connected to the upper pipe body and correspondingly engaged with the lower connecting piece to communicate with the inner hole of the lower pile and the upper pile The ring-shaped upper connector of the inner hole.

In the prestressed concrete pile described in the utility model, the reinforcement unit includes a reinforcement cage that penetrates the inner hole of the upper pile and the inner hole of the lower pile, and a steel cage poured into the inner hole of the upper pile and the inner hole of the lower pile. and contact the closed end to combine the reinforcement cage with the core-filled concrete of the upper pile body and the lower pile body, the reinforcement cage has a plurality of vertical reinforcement partially or fully protruding from the upper pile body, and a plurality of spaced windings A spiral stirrup outside the vertical reinforcement, and the core-filled concrete is selected from concrete without expansion agent or concrete with expansion agent.

In the electric prestressed concrete pile described in the utility model, the reinforcement unit includes a partition set in the inner hole of the lower pile at intervals from the lower connector, and a partition that penetrates the inner hole of the upper pile and the inner hole of the lower pile. a reinforcement cage, and a core-filled concrete that is poured into the inner hole of the upper pile and the inner hole of the lower pile and touches the partition to combine the reinforcement cage with the upper pile body and the lower pile body, the reinforcement cage There are a plurality of vertical steel bars protruding partially or completely from the upper pile body, and a plurality of spiral stirrups wound around the vertical steel bars at intervals, and the core-filled concrete is selected from concrete without expansion agent or with expansion agent of concrete.

In the prestressed concrete pile described in the utility model, the reinforcement unit includes a filling soil filled in the inner hole of the lower pile, a reinforcement cage penetrating the inner hole of the upper pile and the inner hole of the lower pile, and a pouring core-filled concrete in the inner hole of the upper pile and the inner hole of the lower pile and contacting the filling soil to combine the reinforcement cage with the upper pile body and the lower pile body, the reinforcement cage has a plurality of partial or full protrusions The vertical reinforcement of the upper pile body and a plurality of spiral stirrups wound around the vertical reinforcement at intervals, and the core-filled concrete is selected from concrete without expansion agent or concrete with expansion agent.

The beneficial effect of the utility model is that: the reinforcing unit connecting the upper pile body and the lower pile body by piercing the inner hole of the upper pile and the inner hole of the lower pile is used to lift the lower pile unit and the upper pile which are engaged with each other. The ability of the unit to withstand vertical compression, tension and horizontal shear, thereby increasing structural strength and durability.

Description of drawings

Fig. 1 is a sectional view illustrating a conventional prestressed concrete pile.

Fig. 2 is a sectional view illustrating the first embodiment of the prestressed concrete pile of the present invention.

FIG. 3 is another cross-sectional view illustrating the aspect of the reinforcing unit in the first embodiment.

Fig. 4 is a cross-sectional view illustrating another form of the upper tube and the lower tube.

Fig. 5 is a sectional view illustrating the second embodiment of the prestressed concrete pile of the present invention.

Fig. 6 is a sectional view illustrating the third embodiment of the prestressed concrete pile of the present invention.

Fig. 7 is a sectional view illustrating the fourth embodiment of the prestressed concrete pile of the present invention.

Fig. 8 is a sectional view illustrating the fifth embodiment of the prestressed concrete pile of the present invention.

Fig. 9 is a sectional view illustrating the sixth embodiment of the prestressed concrete pile of the present invention.

FIG. 10 is a schematic diagram illustrating the operation of the sixth embodiment.

Fig. 11 is a sectional view illustrating the aspect of the radial section of the sixth embodiment.

Fig. 12 is a sectional view illustrating the seventh embodiment of the prestressed concrete pile of the present invention.

Fig. 13 is a sectional view illustrating the eighth embodiment of the prestressed concrete pile of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail. Before the present utility model is described in detail, it should be noted that in the following description, similar components are denoted by the same numerals.

Referring to Figures 2 and 3, the first embodiment of the prestressed concrete pile of the present utility model comprises a pile-up unit 2 and a pile-up unit 3 that are connected to each other on the upper and lower sides, and a pile-up unit 3 and the pile-up unit 3 that are inserted in combination. Reinforcement unit 4 for unit 2.

The pile-up unit 2 includes a tubular upper pile body 21 formed with a longitudinally hollow pile-up inner hole 210. The pipe body 211, and two ring-shaped upper connectors 212 respectively connected to the two ends of the upper pipe body 211 and connected to the inner hole 210 of the upper pile and made of metal.

The lower pile unit 3 includes a lower pile body 31 which is engaged with the upper pile body 21 and forms a longitudinally hollow lower pile inner hole 310 communicating with the upper pile inner hole 210 . The lower pile body 31 has a lower tube body 311 which is made of prestressed concrete and surrounds the inner hole 310 of the lower pile body 310, and two tubes are respectively connected to the two ends of the lower tube body 311 and communicated with the lower pile body. The hole 310 is an annular lower connecting piece 312 made of metal material. It should be noted here that, in this embodiment, the upper pipe body 211 and the lower pipe body 311 are prestressed concrete pipe piles with circular cross-sectional outer edges. Of course, in practical applications, the upper pipe body 211 and the lower pipe body 311 can also be a prestressed concrete hollow square pile with a rectangular cross-sectional outer edge as shown in FIG. 4 , which can still achieve the same effect.

In this embodiment, the dimensions of the upper tube body 211 and the lower tube body 311 are 15 meters in length, 700 mm in outer diameter, and 480 mm in inner diameter. The thickness of the upper connecting member 212 and the lower connecting member 312 is 22 mm and is made of steel.

The lower pile body 31 and the upper pile body 21 respectively utilize the lower connector 312 positioned above the lower tube body 311 to be correspondingly welded with the upper connector 212 positioned below the upper tube body 211 to communicate with the upper tube body 211 and the upper tube body 211. The lower tube body 311 forms a joint A connecting the upper pile body 21 and the lower pile body 31 .

The reinforcement unit 4 includes a partition 40 spaced apart from the lower connector 312 in the inner hole 310 of the lower pile, a partition that penetrates the upper pile body 21 and extends into the lower pile body 31 and touches or approaches The reinforcement cage 41 on the partition 40, and a core-filled concrete poured into the inner hole 210 of the upper pile and the inner hole 310 of the lower pile to combine the reinforcement cage 41 with the upper pile body 21 and the lower pile body 31 42. It should be noted here that, for the convenience of description, the core-filled concrete 42 in Fig. 2 is not drawn with section lines, and in this embodiment, the reinforcement cage 41 close to the partition plate 40 is used for illustration. In practical application, The reinforcement cage 41 can also directly touch the partition plate 40, and the same effect can still be achieved.

The partition plate 40 divides the lower pile inner hole 310 into a connecting section 313 communicating with the upper pile inner hole 210, and a bottom section 314 separated from the connecting section 313, and the reinforcing cage 41 extends into the connecting section 313 . In this embodiment, the partition plate 40 is a steel plate with a thickness of 4 mm, the depth of the connecting section 313 is 3 meters, and the depth of the bottom section 314 is 12 meters. In other words, the core-filled concrete 42 penetrates deep into the inner hole 310 of the lower pile to a depth of 3 meters. In actual use, the partition 40 can also be made of wood or other materials, and the partition 40 can be set in the inner hole 310 of the lower pile first, and can also be fixed in the inner hole 310 of the lower pile by using a hanging form on the construction site. , can achieve the same effect.

In this embodiment, the steel cage 41 has 12 vertical steel bars 411 with a diameter of 22 mm and a yield strength of Fy=4,200 kg/cm2 (about 412 N/mm2) that protrude wholly or partially from the top of the upper pile body 21. And several spiral stirrups 412 with a diameter of 10 mm and a yield strength of Fy=2,800 kg/cm2 (about 274 N/mm2) wound outside the vertical reinforcement 411 at intervals of 150 mm, only shown in Figure 3 due to the viewing angle A spiral stirrup 412 . The core-filled concrete 42 is concrete with a small amount of expansion agent added, and its compressive strength is 210kg/cm2 (about 21N/mm2). The vertical steel bars 411 protrude from the upper connecting piece 212 and can be used to connect the upper pile body 21 with the upper foundation cap (not shown).

In this embodiment, all the vertical steel bars 411 protrude from the upper connecting member 212 . In practice, as long as some vertical reinforcing bars 411 protrude from the upper connecting member 212 , the same effect can be achieved.

Using the upper connecting piece 212 and the lower connecting piece 312 to cooperate with the partition plate 40 located in the inner hole 310 of the lower pile, the steel cage 41 is combined with the core-filled concrete 42 to form a joint between the upper pile body 21 and the lower pile body. Inside the lower pile body 31 is a reinforced concrete reinforcing unit 4 with a length of about 18 meters. When the upper connecting piece 212 and the lower connecting piece 312 welded at the pile joint A of the upper pile body 21 and the lower pile body 31 are corroded, the prestressing force can also be raised by the reinforcement cage 41 and the core-filled concrete 42. Bearing capacity of concrete piles for vertical compression, tension and horizontal shear.

As far as this embodiment is concerned, even if the upper connecting piece 212 and the lower connecting piece 312 welded to each other cannot bear the tensile force due to corrosion, the reinforcing unit 4 can still exert a strength equal to the number of steel bars multiplied by the area of the steel bars multiplied by the yield strength of the steel bars The pulling force is equivalent to 12*(π/4*2.22)*4200=191586kg, about 191tons. Other bearing capacity such as vertical pressure and horizontal shear force will also be improved by the reinforcement unit 4 at the same time.

And because the length of the reinforcement unit 4 is longer, the frictional force and tensile force between the core-filled concrete 42 and the upper pipe body 211 and the lower pipe body 311 can be increased, so that the foundation cap above the prestressed concrete pile can be fully The power (not shown) is transmitted to the upper pile body 21 and the lower pile body 31 .

In this embodiment, the core-filled concrete 42 and the steel cage 41 that are often used in the pile head processing (or pile head reinforcement) between the upper pile and the foundation cap in the construction of prestressed concrete pipe piles are generally used to go deep into the upper pile. The depth of 1 meter to 3 meters in the pile inner hole 210 is further extended and penetrated beyond the pile joint A of the upper pile body 21 and the lower pile body 31, and reaches the lower pile inner hole 310 of the lower pile body 31, After placing the reinforcement cage 41 and pouring the core concrete 42 to harden, a reinforcement unit 4 that runs through the pile-on unit 2 and the pile-down unit 3 is formed.

Referring to Fig. 5, the second embodiment of the prestressed concrete pile of the present utility model is roughly similar to the first embodiment, the difference is that the prestressed concrete pile includes two pile-up units 2 which are welded up and down. The strong unit 4 penetrates the pile-up unit 2 and extends into the pile-down unit 3 .

Since this embodiment is substantially similar to the first embodiment, except that the same effect as the first embodiment can be achieved. The jointing of multiple pile loading units 2 can increase the overall length of the prestressed concrete pile and the depth of penetration into the underground soil layer, so as to meet the requirement of greater bearing capacity. This embodiment mainly illustrates the application examples of prestressed concrete piles with more than three sections.

Referring to Fig. 6, the third embodiment of the prestressed concrete pile of the present invention is roughly similar to the first embodiment, except that the partition plate 40 is combined below the lower connector 312 away from the piling unit 2 , so as to increase the depth of the reinforcing unit 4 extending into the lower tube body 311 , and increase the friction and tensile force between the core-filled concrete 42 and the upper tube body 211 and the lower tube body 311 . The main difference between this embodiment and the first embodiment is that the reinforcement unit 4 penetrates to the full depth of the pile 3 , which can further strengthen the bonding force between the reinforcement unit 4 and the pile unit 3 .

Referring to Fig. 7, the fourth embodiment of the prestressed concrete pile of the present invention is roughly similar to the first embodiment, the difference is that the partition plate 40 is combined with the lower pipe body 311 away from the upper pipe body 211 to increase the depth of the reinforcing unit 4 extending into the lower tube body 311 , and increase the friction and tensile force between the core-filled concrete 42 and the upper tube body 211 and the lower tube body 311 .

Referring to Fig. 8, the fifth embodiment of the prestressed concrete pile of the present invention is roughly similar to the first embodiment, the difference is that the reinforcing unit 4 includes a filler that is filled in the inner hole 310 of the lower pile Soil 43, a reinforcement cage 41 that penetrates the inner hole 210 of the upper pile and the inner hole 310 of the lower pile, and one that is poured into the inner hole 210 of the upper pile and the inner hole 310 of the lower pile and is close to the filling soil 43 to combine The reinforcement cage 41 and the core-filled concrete 42 of the upper pile body 21 and the lower pile body 31 . For convenience of description, the core-filled concrete 42 is not drawn with section lines.

Since the present embodiment is roughly similar to the first embodiment, in addition to achieving the same effect as the first embodiment, the use of filling soil 43 to replace the partition 40 is not only relatively low cost, but also facilitates construction and lifting. convenience.

Referring to Fig. 9, the sixth embodiment of the prestressed concrete pile of the present invention is roughly similar to the first embodiment, the difference is that the lower pile body 31 has a prestressed concrete and surrounds it. The lower tube body 311 of the lower pile inner hole 310 has an open end 315 communicating with the lower pile inner hole 310 and a tapered closed end 316 opposite to the open end 315 . The lower pile body 31 also has a ring-shaped lower connecting piece 312 connected to the opening end 315 and made of metal and connected to the inner hole 310 of the lower pile.

Since the present embodiment is roughly similar to the first embodiment, in addition to achieving the same effects as the first embodiment, the tapered closed end 316 can be applied to the hammering or press-in type of prestressed concrete piles. Construction method, and placed in the soil layer in a convenient and labor-saving way.

Referring to Fig. 10, the construction method of the sixth embodiment of the prestressed concrete pile of the present invention includes the following steps from left to right:

First, hang the upper pile unit 2 and the lower pile unit 3 connected up and down to the construction position. In this embodiment, the length of the upper pile body 21 and the lower pile body 31 is 15 meters, the outer diameter is 700 millimeters, and the inner diameter is 460 millimeters. Then, use the hammer head 200 of the pile driver to drive the upper pile body 21 and the lower pile body 31 connected up and down into the soil layer to the design depth; next, put the steel cage 41 into the upper pipe body 211 and the lower pipe body 311; then, a special dense pipe (TremiePipe) 201 is inserted into the upper pile body 21 and the lower pile body 31; finally, the core-filled concrete 42 is poured into the pile body 31 by using the special dense pipe 201 In the upper pile body 21 and the lower pile body 31, after the core-filled concrete 42 is dry and hard, the prestressed concrete pile can be completed.

Referring to Figures 10 and 11, the inner diameter of the upper pipe body 211 and the lower pipe body 311 is 480 millimeters, the thickness T1 of the protective layer on both sides of the core-filled concrete 42 is deducted to be about 50 millimeters, and the diameter of the spiral stirrup 412 is 10 millimeters. After centimeters, and the diameter of the vertical reinforcement 411 is 22 millimeters, the diameter D1 of the circle surrounded by the vertical reinforcement 411 is about 316 millimeters (480-2*50-2*10-2*22=316), suitable for The special dense pipe 201 used for the darker concrete grouting of the filling depth is generally 6 inches, 8 inches, or 10 inches in pipe diameter, and the diameter D1 of the circle surrounded by the vertical reinforcement 411 is about 316 millimeters, which is enough for general characteristics. The dense pipe 201 is inserted into the circular space surrounded by the vertical steel bars 411 for construction.

Utilize this dense tube 201 to go deep into the inner hole 210 of the pile and the inner hole 310 of the lower pile to pour the core-filled concrete 42 to avoid material separation. A strong frictional force is formed between the body 21 and the lower pile body 31 .

It should be particularly noted here that FIG. 10 illustrates the hammering (or press-in) construction method, which is not limited in practical application.

Referring to Fig. 12, the seventh embodiment of the prestressed concrete pile of the present invention is roughly similar to the sixth embodiment, except that the reinforcement unit 4 includes a spacer arranged in the inner hole 310 of the lower pile. Plate 40.

Utilizing the partition plate 40 as a supporting template for the core-filled concrete 42 can improve the pouring quality of the core-filled concrete 42 .

Referring to Fig. 13, the eighth embodiment of the prestressed concrete pile of the present invention is roughly similar to the seventh embodiment, the difference is that the reinforcement unit 4 includes a filling soil filled in the inner hole 310 of the lower pile 43. A reinforcement cage 41 that penetrates the inner hole 210 of the upper pile and the inner hole 310 of the lower pile, and a steel cage 41 that is poured into the inner hole 210 of the upper pile and the inner hole 310 of the lower pile and touches the filling soil 43, To combine the reinforcement cage 41 with the core-filled concrete 42 of the upper pile body 21 and the lower pile body 31 .

Since this embodiment is roughly similar to the seventh embodiment, in addition to being able to achieve the same effect as the seventh embodiment, the use of filling soil 43 to replace the partition 40 is not only relatively low in cost, but also facilitates construction and lifting. convenience.

To sum up, the prestressed concrete pile of the present invention utilizes the reinforcement unit 4 that penetrates the upper pile body 21 and the lower pile body 31 to connect the upper pile body 21 and the lower pile body 31 to enhance mutual engagement. The lower pile unit 3 and the pile upper unit 2 can withstand vertical pressure, tension and horizontal shear force, thereby increasing the structural strength and durability.

Claims (12)

1. a prestressed concrete pile, comprise a lower pile element, and pile element at least one, this lower pile element comprises the lower pile body that is formed with the lower stake endoporus of a longitudinal hollow, on this, pile element comprises a upper pile body be bonded with each other with this lower pile body, and on this, pile body is formed with the upper stake endoporus of longitudinal hollow that one is connected with this lower stake endoporus, it is characterized in that:

This prestressed concrete pile also to comprise in the hollow placing pile body on this stake endoporus and stake endoporus under the hollow of this lower pile body to be connected the reinforcement unit of pile body and this lower pile body on this.

2. prestressed concrete pile according to claim 1, it is characterized in that: this lower pile body has one with made by concrete and around the lower tube body defining this lower stake endoporus, and one is connected with one end in this lower tube body and connector made by metal material and under being communicated with the ring-type of this lower tube body, on this, pile body has one with made by concrete and around the upper tube body defining stake endoporus on this, and one is connected with one end in this upper tube body and correspondingly with this lower connector engages to be communicated with this lower stake endoporus and the ring-type upper connector of stake endoporus on this.

3. prestressed concrete pile according to claim 2, is characterized in that: this reinforcement unit comprises the dividing plate of a block in this lower tube body in contrast to one end of this lower connector.

4. prestressed concrete pile according to claim 2, it is characterized in that: this reinforcement unit comprises a dividing plate be arranged at intervals at this lower connector in this lower stake endoporus, and this lower stake endoporus is distinguished into a Connectivity Section communicated with stake endoporus on this by this dividing plate, and a bottom stage separated mutually with this Connectivity Section.

5. prestressed concrete pile according to claim 2, it is characterized in that: this lower pile body also have one be arranged at this lower tube body in contrast to this lower connector one end and be communicated with the annular base plate of this lower stake endoporus, this reinforcement unit comprises a block in the dividing plate of this annular base plate.

6. the prestressed concrete pile according to claim arbitrary in claim 3 to 5, it is characterized in that: this reinforcement unit also comprises the reinforcing cage that places stake endoporus and this lower stake endoporus on this, and one to be poured on this in stake endoporus and this lower stake endoporus and to touch and is butted on this dividing plate with in conjunction with this reinforcing cage and the wadding weft variation of pile body and this lower pile body on this, this reinforcing cage has multiple vertical reinforcing bar partly or entirely giving prominence to pile body on this, and the spiral stirrup of multiple apart windings outside described vertical reinforcing bar, and this wadding weft variation is selected from the concrete not adding expansion agent or the concrete adding expansion agent.

7. prestressed concrete pile according to claim 2, it is characterized in that: this reinforcement unit comprises the filling soil clogged in this lower stake endoporus, a reinforcing cage placing stake endoporus and this lower stake endoporus on this, and one to be poured on this in stake endoporus and this lower stake endoporus and to touch and is butted on this filling soil with in conjunction with this reinforcing cage and the wadding weft variation of pile body and this lower pile body on this, this reinforcing cage has multiple vertical reinforcing bar partly or entirely giving prominence to pile body on this, and the spiral stirrup of multiple apart windings outside described vertical reinforcing bar, and this wadding weft variation is selected from the concrete not adding expansion agent or the concrete adding expansion agent.

8. a prestressed concrete pile, comprise a lower pile element, and pile element at least one, this lower pile element comprises the lower pile body that is formed with the lower stake endoporus of a longitudinal direction, this lower pile body has one with made by prestressed concrete and around the lower tube body defining this lower stake endoporus, this lower tube body has the openend that is communicated with this lower stake endoporus, and one in contrast to this openend and in cone-shaped blind end, on this, pile element comprises a upper pile body be bonded with each other with this lower pile body, on this, pile body is formed with the upper stake endoporus of longitudinal hollow that one is communicated with this lower stake endoporus, it is characterized in that:

This prestressed concrete pile also to comprise in the hollow placing pile body on this stake endoporus and stake endoporus under the hollow of this lower pile body to be connected the reinforcement unit of pile body and this lower pile body on this.

9. prestressed concrete pile according to claim 8, it is characterized in that: this lower pile body also has one and is connected with in this openend and connector made by metal material and under being communicated with the ring-type of this lower stake endoporus, on this, pile body has one with made by concrete and around the upper tube body defining stake endoporus on this, and one is connected with one end in this upper tube body and correspondingly with this lower connector engages to be communicated with this lower stake endoporus and the ring-type upper connector of stake endoporus on this.

10. prestressed concrete pile according to claim 9, it is characterized in that: this reinforcement unit comprises the reinforcing cage that places stake endoporus and this lower stake endoporus on this, and one to be poured on this in stake endoporus and this lower stake endoporus and to touch and is butted on this blind end with in conjunction with this reinforcing cage and the wadding weft variation of pile body and this lower pile body on this, this reinforcing cage has multiple vertical reinforcing bar partly or entirely giving prominence to pile body on this, and the spiral stirrup of multiple apart windings outside described vertical reinforcing bar, and this wadding weft variation is selected from the concrete not adding expansion agent or the concrete adding expansion agent.

11. prestressed concrete piles according to claim 9, it is characterized in that: this reinforcement unit comprises a dividing plate be arranged at intervals at this lower connector in this lower stake endoporus, a reinforcing cage placing stake endoporus and this lower stake endoporus on this, and one to be poured on this in stake endoporus and this lower stake endoporus and to touch and is butted on this dividing plate with in conjunction with this reinforcing cage and the wadding weft variation of pile body and this lower pile body on this, this reinforcing cage has multiple vertical reinforcing bar partly or entirely giving prominence to pile body on this, and the spiral stirrup of multiple apart windings outside described vertical reinforcing bar, and this wadding weft variation is selected from the concrete not adding expansion agent or the concrete adding expansion agent.

12. prestressed concrete piles according to claim 9, it is characterized in that: this reinforcement unit comprises the filling soil clogged in this lower stake endoporus, a reinforcing cage placing stake endoporus and this lower stake endoporus on this, and one to be poured on this in stake endoporus and this lower stake endoporus and to touch and is butted on this filling soil with in conjunction with this reinforcing cage and the wadding weft variation of pile body and this lower pile body on this, this reinforcing cage has multiple vertical reinforcing bar partly or entirely giving prominence to pile body on this, and the spiral stirrup of multiple apart windings outside described vertical reinforcing bar, and this wadding weft variation is selected from the concrete not adding expansion agent or the concrete adding expansion agent.