CN111877326A

CN111877326A - Pile body angle bead cover and prefabricated building structure

Info

Publication number: CN111877326A
Application number: CN202010650292.9A
Authority: CN
Inventors: 许顺良
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2020-11-03

Abstract

The invention provides a pile body angle bead sleeve and a prefabricated building structure. The pile body corner protection sleeve comprises a pile sleeve for sleeving the peripheral wall of the precast pile, a notch is formed in the end part of the pile sleeve, and the end part of the pile sleeve is bent towards the axis direction of the pile sleeve and forms a return folding edge. The pile body angle bead sleeve provided by the invention has the advantages that the rigidity is improved, when an external force acts on the pile body angle bead sleeve, the degree of sinking or distortion deformation of the pile sleeve towards the axis direction of the pile body angle bead sleeve is reduced, the pile body angle bead sleeve can be tightly wrapped on the end part of a precast pile and sleeved on the peripheral wall of the precast pile, the concrete at the end part of the precast pile is well pressed, the concrete is prevented from being broken and falling off, and the reliability and the durability of a precast building structure are improved.

Description

Pile body angle bead cover and prefabricated building structure

Technical Field

The invention relates to the technical field of buildings, in particular to a pile body corner protector sleeve and a prefabricated building structure.

Background

The prefabricated building structure refers to various pile bodies which are transported to a construction site after being prefabricated, and comprises a prefabricated pile formed by pouring and hardening concrete and a pile body corner protection sleeve sleeved at the end part of the prefabricated pile. The existing pile body corner protector is made by bending and rolling a light thin plate made of a metal material and forms a cylindrical structure. The pile body angle bead sleeve has low rigidity and poor deformation resistance, and particularly, in the process of transporting the pile body angle bead sleeve, the side wall of the pile body angle bead sleeve can be subjected to undesirable deformation such as sinking and distortion due to force acting on the side part of the pile body angle bead sleeve, so that the end part of the precast pile cannot be tightly wrapped by the pile body angle bead sleeve. When the prefabricated building structure is pressed into the soil layer by the pile driver, the deformed pile body corner protection sleeve cannot be tightly sleeved on the peripheral wall of the prefabricated pile, concrete at the end part of the prefabricated pile is broken and falls off, and the reliability and the durability of the prefabricated building structure are reduced.

Disclosure of Invention

In view of the above, there is a need for an improved pile body corner protector and prefabricated building structure.

The invention provides a pile body corner protector sleeve which comprises a pile sleeve for sleeving the peripheral wall of a prefabricated pile, wherein the end part of the pile sleeve is provided with a notch, and the end part of the pile sleeve is bent towards the axis direction of the pile sleeve and forms a return folding edge.

The pile body angle bead sleeve provided by the invention has the advantages that the rigidity is improved, when external force acts on the side part of the pile body angle bead sleeve, the degree of sinking or distortion deformation of the pile sleeve towards the axis direction of the pile body angle bead sleeve is reduced, the pile body angle bead sleeve can be tightly wrapped on the end part of a precast pile and sleeved on the peripheral wall of the precast pile, the concrete at the end part of the precast pile is well pressed, the concrete is prevented from being broken and falling off, and the reliability and the durability of a precast building structure are improved.

In one embodiment of the invention, the return edge is integrally formed with the pile sleeve.

So set up, return the hem and overlap between be connected more firm reliable, pile body angle bead cover's rigidity and intensity all further improve, can wrap up the concrete of precast pile tip more closely, and pile body angle bead cover is better to the protection effect of precast pile.

In one embodiment of the invention, the back folding edge extends from the end part of the pile sleeve to the axial direction of the pile sleeve and is formed, and the length of the back folding edge is 1 cm-10 cm.

So set up, have bigger area of contact between time hem and precast pile tip, when the pile driver hit and beat precast building structure, can prevent that pile body angle bead cover from the tip of precast pile downwards landing under the impact of pile driver to in the operation of burying deeply of accomplishing precast building structure fast, smoothly.

The invention also provides a prefabricated building structure which comprises the prefabricated pile and any one of the pile body angle bead sleeves, wherein the pile body angle bead sleeve is sleeved on the peripheral wall of the prefabricated pile, and the folded edge is abutted against the end part of the prefabricated pile.

The prefabricated building structure provided by the invention has better reliability and durability, the peripheral wall and the end part of the prefabricated pile can be more tightly sleeved and wrapped by the pile body angle bead sleeve, and the concrete of the prefabricated pile is fixed on the inner wall of the pile body angle bead sleeve, so that the concrete material at the end part of the prefabricated pile can be prevented from being broken and falling off; in addition, when the pile driver strikes the precast pile, the pile body corner protection sleeve can be more stably sleeved at the end part of the precast pile and cannot slide downwards.

In one embodiment of the invention, the return edge is flush with the end of the precast pile; or the included angle between the return folding edge and the pile sleeve is smaller than 90 degrees, and the return folding edge extends into the end part of the precast pile.

Due to the arrangement, in the process of striking the prefabricated building structure by the pile driver, the folded edge can be stably abutted against the end part of the prefabricated pile, and plastic deformation and even breakage can not occur under the impact of the pile driver; in addition, the return edge and the end part of the precast pile form a flat end surface of the precast building structure, and impact force generated by the pile driver is intensively applied to the flat end surface, so that the pressure intensity of the return edge or the end part of the precast pile can be reduced, and the risk of concrete cracking at the end part of the precast pile is reduced; in addition, the prefabricated building structure provided by the invention does not need to arrange an end plate at the end part of the prefabricated pile, and compared with the existing prefabricated building structure, the pile body corner protector can be more tightly fixed on the concrete material of the prefabricated pile and is not easy to separate from the end part of the prefabricated pile. When the included angle between the folded edge and the pile sleeve is smaller than 90 degrees, the folded edge can be completely or partially embedded into the concrete at the end part of the precast pile, so that the folded edge and the precast pile form more reliable fixation connection, the pile body angle bead sleeve can be connected to the precast pile in an occluded manner, and the risk that the pile body angle bead sleeve falls off from the precast pile is reduced.

In one embodiment of the present invention, the prefabricated building structure further comprises a plurality of quick docking assemblies, two prefabricated piles can be docked by the plurality of quick docking assemblies, and the reverse folded edge is annularly provided in a shape surrounded by the plurality of quick docking assemblies.

So set up, the length of prefabricated building structure extends, therefore can increase the relative height between the pile point of top cushion cap roof beam/board and precast pile bottom through the mode of a plurality of prefabricated building structure end butt joints.

In one embodiment of the present invention, a precast pile includes a hollow portion, a solid portion, and a first cage body, the hollow portion being connected to the solid portion; the hollow part is internally provided with a core groove, and the first cage body is arranged in the hollow part and the solid part; the pile sleeve is sleeved on the peripheral wall of the hollow part or the solid part, and the folded edge is abutted against the end part of the hollow part or the solid part.

So set up, the precast pile is local hollow precast pile, and the perisporium of local hollow precast pile is located to pile body angle bead cover to can protect the concrete material of local hollow precast pile tip, prevent that its damage from droing, with reliability and the durability that improves local hollow precast pile.

Further, in an embodiment of the present invention, the precast pile further includes a second cage disposed inside the solid portion.

According to the arrangement, the precast pile is a local reinforced hollow precast pile, and the pile body corner protector sleeve is sleeved on the peripheral wall of the local reinforced hollow precast pile, so that the concrete material at the end part of the local reinforced hollow precast pile can be protected, the concrete material is prevented from being damaged and falling off, and the reliability and the durability of the local reinforced hollow precast pile are improved; in addition, the second cage body improves the local reinforcement ratio of the solid part, so that the tensile capacity, the compressive capacity, the shearing resistance and the durability of the precast pile are further improved, and the seismic capacity of the precast building structure is improved.

In one embodiment of the invention, the precast pile further comprises a pre-buried connecting piece, wherein the pre-buried connecting piece is positioned at the end part of the precast pile and is sleeved with the quick butt joint assembly; the pile body corner protector sleeve further comprises a positioning ring, and the positioning ring is fixedly connected to the pile body corner protector sleeve and sleeved with the embedded connecting piece.

So set up, pile body angle bead cover keeps relative position fixed through between holding ring and the first cage body to further guarantee relative position between the precast pile of mutual butt joint and fix, strengthened the joint strength between pile body angle bead cover and the pile body, prevent that precast building structure when in service pile body angle bead cover misplaces, the incline takes place deformation even relatively precast pile.

In one embodiment of the invention, the precast pile is a square pile, and the cross section of the pile sleeve cut along the direction vertical to the axis is rectangular; or the precast pile is a tubular pile, and the shape of the pile sleeve cut along the direction vertical to the axis is circular.

So set up, the precast pile can satisfy actual building construction's on-the-spot needs better. The prefabricated building structure provided by the invention has better reliability and durability, the peripheral wall and the end part of the prefabricated pile can be more tightly sleeved and wrapped by the pile body angle bead sleeve, and the concrete of the prefabricated pile is fixed on the inner wall of the pile body angle bead sleeve, so that the concrete material at the end part of the prefabricated pile can be prevented from being broken and falling off; in addition, when the pile driver strikes the precast pile, the pile body corner protection sleeve can be more stably sleeved at the end part of the precast pile and cannot slide downwards.

Drawings

Fig. 1 is a sectional view of a pile body corner protector according to an embodiment of the present invention;

fig. 2 is a schematic view of a pile body corner protector sleeve according to another embodiment of the present invention from a first perspective;

FIG. 3 is a schematic view of a prefabricated building structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of a prefabricated building structure according to another embodiment of the present invention;

FIG. 5 is a schematic view of a portion of the prefabricated building structure of FIG. 3;

FIG. 6 is a schematic view of the docking of two prefabricated building structures shown in FIG. 4;

FIG. 7 is a partial schematic view of the two prefabricated building structures of FIG. 6 after docking;

FIG. 8 is a schematic diagram of a retaining ring according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a quick docking assembly according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a quick docking assembly according to another embodiment of the present invention.

100. Pile body corner protection sleeves; 10. pile cover; 111. a first hoop section; 112. a second hoop section; 20. folding the edges; 30. a flared part; 61. a positioning ring; 70. pre-burying a connecting piece; 200. prefabricating a building structure; 210. prefabricating a pile; 211. a hollow portion; 212. a solid portion; 213. a first cage; 214. a core groove; 215. a second cage; 220. a quick docking assembly; 221. a first insert table; 222. a first base; 2211. a first fixed part; 2212. a first insertion part; 2213. a first extension portion; 2214. a first step surface; 2221. a second fixed part; 2222. a fin; 231. a second insert table; 232. a second base; 2311. a third fixed part; 2312. a second insertion part; 2313. a first groove; 2321. a first end face; 2322. a second end face; 230. a quick connector; 250. and (5) buckling.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The prefabricated building structure 200 refers to various pile bodies which are transported to a construction site after being prefabricated. The prefabricated building structure 200 can be produced in a centralized manner in a factory, prefabrication can be completed around a construction site, the axial length and the radial circumference of the prefabricated building structure can be selected according to construction needs, the reinforcement ratio of the prefabricated building structure can be designed according to the stress of the prefabricated building structure 200 during transportation, hoisting and pile pressing, and the flexibility is high.

The prefabricated building structure 200 includes the precast pile 210 and the pile body corner protector 100, and the precast pile 210 is pressed into the soil layer by a pile driver for forming an installation foundation of the top cap beam/slab and supporting the top cap beam/slab. The pile body corner protection sleeve 100 is arranged at the end part of the precast pile 210 and is sleeved on the peripheral wall of the precast pile 210, so that the concrete at the end part of the precast pile 210 can be prevented from being broken and falling off when the precast pile 210 is buried underground or in service, the strength of the precast pile structure 200 is prevented from being reduced, and the effect of protecting the precast pile 210 can be achieved; in addition, when concrete is filled, it is possible to make the vibration more sufficient, thereby reducing the breakage rate of the precast pile 210, and thus further improving the strength and quality of the precast building structure 200.

Referring to fig. 1 to 5, fig. 1 is a cross-sectional view of a pile body corner protector 100 according to an embodiment of the present invention; fig. 2 is a schematic view of a pile body corner protector 100 according to another embodiment of the present invention from a first perspective; FIG. 3 is a schematic view of a prefabricated building structure 200 according to an embodiment of the present invention; FIG. 4 is a schematic view of a prefabricated building structure 200 according to another embodiment of the present invention; fig. 5 is a partial structural schematic view of the prefabricated building structure 200 shown in fig. 3.

The invention provides a pile body corner protection sleeve 100 which comprises a pile sleeve 10, wherein the pile sleeve 10 is tubular and can be sleeved on the peripheral wall of a precast pile 210. After the concrete of the precast pile 210 is hardened and formed, the pile body corner protection sleeve 100 is wrapped on the end of the precast pile 210.

Specifically, in the present embodiment, the precast pile 210 is a tubular pile or a square pile, and the cross section of the pile sleeve 10 cut along the direction perpendicular to the axis is circular or rectangular; the pile body corner protection sleeve 100 is formed by bending a thin plate made of carbon structural steel into a cylindrical tube shape or a square tube shape, and the material is preferably Q235 steel; the thickness of the pile body corner protection sleeve 100 is 0.5 mm-12 mm, and the size of the pile body corner protection sleeve along the axial direction of the precast pile 210 is 60 mm-500 mm. Preferably, the thickness of the pile body corner protection sleeve 100 is 1mm to 8mm, and the height of the pile body corner protection sleeve 100 along the axial direction of the precast pile 210 is 80mm to 200 mm.

It is understood that the precast pile 210 may also be a pile body with other shapes, the pile body corner protection sleeve 100 may also be formed by bending and rolling a metal sheet into other shapes, and the cross section of the pile sleeve 10 cut along the direction perpendicular to the axis may also be a pentagon, a hexagon, etc.; the pile body corner protection sleeve 100 may also be made of carbon steel or other metal materials with other carbon contents, and the thickness and size of the material may be selected according to the size of the precast pile 210, and is not limited to this embodiment.

The existing pile body corner protector is made by bending and rolling a light thin plate made of a metal material and forms a cylindrical structure. The pile body angle bead sleeve has low rigidity and poor deformation resistance, and particularly, in the process of transporting the pile body angle bead sleeve, the side wall of the pile body angle bead sleeve can be subjected to undesirable deformation such as sinking and distortion due to force acting on the side part of the pile body angle bead sleeve, so that the end part of the precast pile cannot be tightly wrapped by the pile body angle bead sleeve. When the prefabricated building structure is pressed into a soil layer by a pile driver, the deformed pile body corner protection sleeve cannot be tightly sleeved on the peripheral wall of the prefabricated pile, concrete at the end part of the prefabricated pile is crushed and falls off, and the reliability and durability of the prefabricated building structure are reduced, so that the pile sinking type construction operation is not facilitated; in addition, current prefabricated building structure can use the end plate of setting at the precast pile tip usually, and the end plate is used for the inside reinforcing bar of joint precast pile, easily leads to between the two to take place electrochemical corrosion when contacting between end plate and the steel reinforcement cage body, and when two precast piles butt joints, the end plate that is located two precast pile tip also can be because the welding seam takes place to corrode.

In view of this, the pile body corner protection sleeve 100 provided by the present invention further includes a folded edge 20 connected to the end of the pile sleeve 10, the end of the pile sleeve 10 is provided with a notch, and the end of the pile sleeve 10 is bent toward the axial center of the pile sleeve 10 to form the folded edge 20. The return edge 20 is used to reinforce the rigidity of the pile body corner protector 100, thereby improving its ability to resist deformation. When external force acts on the side of the pile body corner protection sleeve 100, the folding edge 20 arranged along the circumferential direction of the pile sleeve 10 can reduce or limit the degree of sinking or distortion of the pile sleeve 10 in the axial direction, so that the lateral rigidity of the pile sleeve 10 is improved, the end of the pile sleeve 10 is provided with a notch, the folding edge 20 is more convenient to bend and form, the resilience stress of the pile sleeve 10 material can be reduced, and the end edge of the pile sleeve 10 is prevented from being folded.

With such an arrangement, the rigidity of the pile body corner protection sleeve 100 is improved, when an external force acts on the pile body corner protection sleeve 100, the degree of sinking or distortion deformation of the pile sleeve 10 towards the axis direction of the pile body corner protection sleeve 100 is reduced, the pile body corner protection sleeve 100 can tightly wrap the end part of the precast pile 210 and is sleeved on the peripheral wall of the precast pile 210, the concrete at the end part of the precast pile 210 can be pressed better, the concrete is prevented from being broken and falling off, and the reliability and durability of the precast building structure 200 are improved; in addition, compared with the existing pile body angle bead sleeve, the pile body angle bead sleeve 100 provided by the invention can be directly matched with the precast pile 210 without arranging an end plate at the end part of the precast pile 210, the combination between the pile body angle bead sleeve 100 and the concrete of the precast pile 210 is tighter, and technicians can conveniently and intuitively and quickly check whether a gap exists between the end part of the precast pile 210 and the pile body angle bead sleeve 100

Please refer to fig. 1 again. Further, in one embodiment of the present invention, the folded-back edge 20 is integrally formed with the pile cover 10.

Specifically, the forming method of the folded edge 20 is as follows: firstly, a plurality of cuts are processed on one edge of a metal sheet in a material removing mode, then the depth dimension of the cuts is used as the length dimension of the return folding edge 20 along the radial direction of the pile sleeve 10, the edge of the metal sheet is bent to form the return folding edge 20, and the metal sheet is bent to be cylindrical or polygonal prism. The folded edge 20 of the present invention is made of a metal material through ductile bending deformation, has better mechanical properties, and is more easily produced in a large scale.

So set up, the connection between return hem 20 and the pile cover 10 is more firm reliable, and pile body angle bead cover 100's rigidity and intensity all further improve, can wrap up the concrete of precast pile 210 tip more closely, and pile body angle bead cover 100 is better to precast pile 210's protection effect.

In one embodiment of the present invention, the folded-back side 20 is formed to extend from the end of the pile cover 10 toward the axial center of the pile cover 10, and the length of the folded-back side 20 is 1cm to 20 cm.

Specifically, in the present embodiment, the pile cover 10 has a cylindrical tubular shape or a square tubular shape, and the folded edge 20 has a circular ring shape or a rectangular ring shape when viewed from the end of the pile body corner protector 100 along the axial direction thereof, and the outer diameter of the folded edge 20 is the same as the outer diameter of the pile cover 10. The length of the folded edge 20 along the radial direction is 1 cm-20 cm, and preferably, the length of the folded edge 20 along the radial direction is 1 cm-10 cm. It can be understood that the pile sleeve 10 can also be a prismatic pile with other shapes, and the section cut along the direction vertical to the axis thereof is pentagonal, hexagonal and the like; accordingly, the inner ring shape and the outer peripheral shape of the folded edge 20 may be pentagonal or hexagonal as viewed from the end of the pile angle bead 100 in the axial direction thereof, and the distance between the inner ring edge and the outer peripheral edge is 1cm to 20 cm.

With such an arrangement, the folded edge 20 has a larger contact area with the end of the precast pile 210, so that when the pile driver strikes the precast building structure 200, the pile body corner protection sleeve 100 can be prevented from sliding down from the end of the precast pile 210 under the impact of the pile driver, so as to quickly and smoothly complete the deep-burying operation of the precast building structure 200.

Further, the folding edges 20 are uniformly arranged along the circumferential direction of the pile sleeve 10, and the lengths of the folding edges 20 extending from the end of the pile sleeve 10 to the axis direction of the pile body corner protection sleeve 100 are all equal.

Specifically, in the present embodiment, the pile sleeve 10 has a cylindrical tubular shape or a square tubular shape, and the outer edge and the inner edge of the folded-back edge 20 have concentric circular shapes or concentric rectangular annular shapes, as viewed from the end of the pile body corner protector 100 along the axial direction thereof. It should be understood that, in other embodiments, the pile cover 10 may be a prism having other shapes, and the cross-sectional shape cut along the direction perpendicular to the axial direction thereof is a pentagon, a hexagon, or the like, and when viewed from the end of the pile body corner protector 100 along the axial direction thereof, the inner edge and the outer edge of the folded-back edge 20 are overlapped with each other as a center point, which is not illustrated here.

With such an arrangement, in the circumferential direction of the pile body corner protector 100, the rigidity of the folded edge 20 to the side portion of the pile sleeve 10 is increased equally, that is, the rigidity distribution of the pile sleeve 10 material is equal in the circumferential direction of the pile body corner protector 100.

Further, the number of the inner concave ribs 30 is multiple, and the multiple inner concave ribs 30 are uniformly distributed at the connecting position of the return folding edge 20 and the pile sleeve 10.

Specifically, in one embodiment, the inner concave ribs 30 are symmetrically distributed at the connection position of the folded edge 20 and the pile sleeve 10 by taking the axis of the pile body corner protector 100 as the center. It is understood that in other embodiments, the inner concave ribs 30 may also be uniformly arranged at the connection of the folded edge 20 and the pile sleeve 10 along the circumferential direction of the pile sleeve 10, and the length between two adjacent inner concave ribs 30 along the folded edge 20 and the boundary of the pile sleeve 10 is the same.

With such an arrangement, along the circumferential direction of the pile body corner protector 100, the inner concave rib 30 has the same rigidity lifting gain for the folded edge 20 and the pile sleeve 10, respectively, and the overall resistance of the pile body corner protector 100 is higher.

The pile body angle bead sleeve 100 provided by the invention has the advantages that the rigidity is improved, when an external force acts on the pile body angle bead sleeve 100, the degree of sinking or distortion deformation of the pile sleeve 10 towards the axis direction of the pile body angle bead sleeve 100 is reduced, the pile body angle bead sleeve 100 can be tightly wrapped on the end part of the precast pile 210 and sleeved on the peripheral wall of the precast pile 210, the concrete at the end part of the precast pile 210 can be well pressed, the concrete is prevented from being broken and falling off, and the reliability and the durability of the precast building structure 200 are improved; in addition, compared with the existing pile body angle bead sleeve, the pile body angle bead sleeve 100 provided by the invention can be directly matched with the precast pile 210 for use without arranging an end plate at the end part of the precast pile 210, the combination between the pile body angle bead sleeve 100 and the concrete of the precast pile 210 is tighter, and technicians can conveniently and intuitively and quickly check whether a gap exists between the end part of the precast pile 210 and the pile body angle bead sleeve 100.

Please refer to fig. 3 to 4 again. The invention also provides a prefabricated building structure 200 applied to foundation buildings in the technical field of buildings. In this embodiment, the prefabricated building structure 200 is used to prefabricate vertically stressed piles. It is understood that in other embodiments, the prefabricated building structure 200 may also be applied in other engineering fields, such as fabricated buildings, etc., and may also be used for horizontal load-bearing piles or composite load-bearing piles, etc.

The existing prefabricated building structure comprises a prefabricated pile, a pile body corner protector sleeve and an end plate, wherein the pile body corner protector sleeve is arranged on the peripheral wall of the prefabricated pile, and the end plate is arranged at the end part of the prefabricated pile and connected with the pile body corner protector sleeve in a welding or fastener connecting mode. However, the end plate and the concrete of the precast pile cannot form reliable fixation connection and are easy to separate, the end plate is dislocated and deviated relative to the precast pile in the process of striking the precast pile by the pile driver, and the pile body angle bead sleeve is driven to deviate and deform, so that the pile body angle bead sleeve cannot tightly encircle the peripheral wall of the precast pile. The concrete of precast pile tip is broken easily and is fallen off, has reduced precast building structure's reliability and durability.

The prefabricated building structure 200 provided by the invention further comprises any one of the pile body corner protectors 100, the pile body corner protector 100 is sleeved on the peripheral wall of the prefabricated pile 210, and the folded edge 20 abuts against the end part of the prefabricated pile 210.

Precast pile 210 includes the steel reinforcement cage body that is enclosed by the reinforcing bar, and the steel reinforcement cage body includes along the axial reinforcing bar of precast pile 210 axial extension and connects and encircle the radial reinforcing bar of locating the axial reinforcing bar. When the precast pile 210 is produced, a hollow tubular mold is prepared, the reinforcement cage is disposed in the mold, then the concrete material is poured into the reinforcement cage, and the mold is removed after the concrete material is formed in the mold and is solidified and hardened, so that the precast pile 210 is obtained.

When concrete materials are poured to the reinforcement cage body, the pile body corner protection sleeve 100 extends into the end portion of the reinforcement cage body from the opening of the end portion of the mold and is arranged at the end portion of the reinforcement cage body, the pile body corner protection sleeve 100 is sleeved on the peripheral wall of the precast pile 210 after the concrete materials are solidified and hardened, and the folded edge 20 abuts against the end portion of the precast pile 210.

The prefabricated building structure 200 provided by the invention can be suitable for the pile sinking type construction operation, namely, the end part of the prefabricated building structure 200 can be hit by a pile driver, and the prefabricated building structure 200 can be flushed into the ground soil layer by utilizing the impact of the pile driver and the inertia of the prefabricated building structure 200.

In addition, the prefabricated building structure 200 provided by the present invention does not need to provide an end plate at the end of the prefabricated pile 210, and compared with the end plate, the pile body corner protector 100 can be more tightly fixed to the concrete material of the prefabricated pile 210 and is not easily separated from the end of the prefabricated pile 210.

Please refer to fig. 3 to 4 again. In one embodiment of the present invention, the folded-back edge 20 is flush with the end of the precast pile 210; or the included angle between the folded edge 20 and the pile sleeve 10 is less than 90 degrees, and the folded edge 20 extends into the end of the precast pile 210.

Specifically, in the present embodiment, the folded edge 20 is wrapped around the end of the precast pile 210, the inner surface of the folded edge 20 abuts against the portion of the end surface of the precast pile 210, and the outer surface is flush with the remaining portion of the end surface of the precast pile 210 and is located in or substantially in the same plane. The return edge 20 and the end of the precast pile 210 together form a flat end surface of the precast building structure 200.

With such an arrangement, in the process of striking the prefabricated building structure 200 by the pile driver, the return flange 20 can be firmly abutted against the end of the prefabricated pile 210, and cannot be plastically deformed or even broken under the impact of the pile driver; in addition, the folded edge 20 and the end of the precast pile 210 form a flat end surface of the precast building structure 200, and the impact force generated by the pile driver is concentrated on the flat end surface, so that the pressure applied to the folded edge 20 or the end of the precast pile 210 can be reduced, thereby reducing the risk of concrete cracking at the end of the precast pile 210; in addition, the prefabricated building structure 200 provided by the present invention does not require an end plate to be disposed at the end of the prefabricated pile 210, and the pile body corner protector 100 can be more tightly fixed to the concrete material of the prefabricated pile 210 and is not easily separated from the end of the prefabricated pile 210, compared to the existing prefabricated building structure.

When the included angle between the folded edge and the pile sleeve is smaller than 90 degrees, the folded edge 20 can be completely or partially embedded into the concrete at the end of the precast pile 210, so as to form more reliable fixation connection with the precast pile 210, so that the pile body corner protector 100 can be engaged and connected with the precast pile 210, and the risk that the pile body corner protector 100 falls off from the precast pile 210 is reduced.

Referring to fig. 6, fig. 7 is a schematic view illustrating the butt joint of two prefabricated building structures shown in fig. 4.

Further, prefabricated building structure 200 still includes a plurality of quick butt joint subassemblies 220, and quick butt joint subassembly 220 sets up in the tip of precast pile 210, and two precast piles 210 can be through the butt joint of quick butt joint subassembly 220, and the shape that a plurality of quick butt joint subassemblies 220 enclose is established to inflection limit 20 ring.

Specifically, the end of the reinforcement cage of the prefabricated building structure 200 is further provided with a quick connector 230, which is respectively arranged between two quick connectors 230 of two prefabricated building structures 200 and connected by a quick docking assembly 220; the quantity of quick-operation joint spare 230 and quick butt joint subassembly 220 is one, or be a plurality of, a plurality of quick-operation joint spare 230 are connected in the axial reinforcing bar end of steel reinforcement cage body, a plurality of quick butt joint subassemblies 220 use the axis of precast pile 210 to enclose the tip of locating precast pile 210 as the center, quick-operation joint spare 230 corresponds with the position of quick butt joint subassembly 220, follow precast pile 210 tip and follow the axial and observe, a plurality of quick butt joint subassemblies 220 are surrounded by inflection turn-ups 20 to quick butt joint subassembly 220 connects the quick-operation joint spare 230 of two precast construction structures 200.

So configured, the prefabricated building structure 200 is extended in length, thereby enabling an increase in the relative height between the top deck beams/slabs and the pile tips (not shown) at the bottom of the prefabricated piles 210 by butting the ends of a plurality of prefabricated building structures 200.

Referring to fig. 7, fig. 7 is an enlarged view of a portion of two prefabricated building structures 200 shown in fig. 6 at Y after they are butted.

In one embodiment of the present invention, the pile sleeve 10 includes at least one first hoop section 111 recessed toward the axial direction of the pile body corner protector 100, and at least one second hoop section 112 protruding outward relative to the first hoop section 111, and the first hoop section 111 and the second hoop section 112 are spaced apart from each other.

Specifically, in the present embodiment, the first hoop section 111 and the second hoop section 112 extend in the circumferential direction of the pile cover 10, and both the first hoop section 111 and the second hoop section 112 are annular.

By such arrangement, the first hoop section 111 and the second hoop section 112 can increase the engaging force between the pile body corner protection sleeve 100 and the precast pile 210, and further improve the tightness of the pile body corner protection sleeve 100 surrounding the peripheral wall of the precast pile 210; in addition, the first hoop sections 111 and the second hoop sections 112 can also increase the fixing capacity between the prefabricated building structure 200 and an external soil layer or a concrete material, so that the prefabricated building structure 200 can bear a stable force.

It can be understood that the first hoop section 111 may be one annular groove, or a plurality of annular grooves may be uniformly distributed along the axial direction of the pile body corner protection sleeve 100, or a plurality of square/circular/irregular grooves may be uniformly distributed along the radial direction of the pile body corner protection sleeve 100, as long as the effect of anchoring with the precast pile 210 is achieved.

Referring to fig. 9 to 10, fig. 9 is a schematic structural diagram of a quick docking assembly 220 according to an embodiment of the present invention, and fig. 10 is a schematic structural diagram of a quick docking assembly 220 according to another embodiment of the present invention.

In one embodiment, the quick docking assembly 220 in the first embodiment includes a first docking station 221 and a first base 222, the first docking station 221 includes a first fixing portion 2211, a first docking portion 2212 and a first extending portion 2213 between the first fixing portion 2211 and the first docking portion 2212, the first base 222 includes a second fixing portion 2221 and a plurality of fins 2222 connected to the second fixing portion 2221, the first docking station 221 is connected to the quick connector of one prefabricated building structure 200 through the first fixing portion 2211, and the first base 222 is connected to the quick connector 230 of another prefabricated building structure 200 through the second fixing portion 2221; the first plug portion 2212 is protruded from the first extension portion 2213, and a first step surface 2214 is formed between the first plug portion 2212 and the first extension portion 2213; the plurality of fins 2222 are arranged to surround each other; the first insert stage 221 can pass through the openings defined by the plurality of fins 2222 by elastic expansion of the fins 2222, the fins 2222 can elastically contract and close the first extension 2213, and the end surface of the fin 2222 and the first step surface 2214 of the first insert stage 221 are disposed opposite to each other.

In this embodiment, the use process of the quick docking assembly 220 is as follows: the first socket 221 is connected with the embedded connector 70 in one of the prefabricated building structures 200 through the first fixing portion 2211, and the first base 222 is connected with the embedded connector 70 in the other prefabricated building structure 200 through the second fixing portion 2221; the first plug part 2212 and the first extension part 2213 of the first plug platform 221 extend into the inner wall of the first base 222 and move along the insertion direction α, and the first plug part 2212 of the first plug platform 221 applies pressure to the fin 2222, so that the fin 2222 elastically expands until the first plug part 2212 passes through the fin 2222; at the moment the first socket 2212 passes through the fin 2222, the fin 2222 elastically contracts to close the first extension 2213, and when a force in the direction opposite to the insertion direction α is applied to the first socket 221, the end of the fin 2222 abuts against the first step 2214 between the first socket 2212 and the first extension 2213 to limit the first socket 221.

After the first inserting portion 2212 of the first inserting table 221 is inserted into the first base 222, the fin 2222 can elastically contract and close the extension portion of the first base 222, the end portion of the fin 2222 abuts against the step surface of the first inserting table 221, and the abutting surface between the end portion of the fin 2222 and the first step surface 2214 of the first inserting table 221 is approximately annular, so that the abutting area is large, the joint strength between two prefabricated building structures 200 can be ensured, and particularly, the vertical stress performance is greatly improved; the fins 2222 not only can enclose the first extension 2213 of the insertion table, but also can limit the first extension 2213, thereby preventing the first extension 2213 from shaking in the radial direction. In addition, the rapid docking assembly 220 provided by the embodiment has the advantages of simple processing technology, low cost and wide application range.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a quick docking assembly 220 according to another embodiment.

The quick docking assembly 220 of the second embodiment includes a second socket 231, a second base 232 and a ring buckle 250, the second socket 231 includes a third fixing portion 2311 and a second socket 2312 disposed oppositely, the second socket 2312 is provided with a first groove 2313; the second base 232 includes a first end surface 2321 and a second end surface 2322 which are oppositely arranged; the ring buckle 250 has an opening (not shown) and can be elastically contracted, and the ring buckle 250 is sleeved on the second socket 231 and accommodated in the first groove 2313; the ring buckle 250 can be inserted into the second base 232 along the insertion direction together with the second insertion portion 2312 of the second socket 231, and the ring buckle 250 can abut against the second end surface 2322 of the second base 232 through elastic expansion and limit the reverse movement of the second socket 231 along the insertion direction.

After the quick docking assembly 220 provided by this embodiment inserts the second inserting portion 2312 of the second inserting stage 231 into the second base 232, the buckle 250 can pop out the first groove 2313 through the elastic expansion portion and abut against the second end face 2322 of the second base 232, an abutting surface between the buckle 250 and the second end face 2322 is approximately annular, an abutting area is large, the joint strength between two embedded connecting pieces 70 can be ensured, and particularly, the vertical stress performance is greatly improved. In addition, the rapid docking assembly 220 provided by the embodiment has the advantages of simple processing technology, low cost and wide application range.

It is understood that the insertion direction α may be, but is not limited to, the above-mentioned directions, and even a partial angular offset should be included in the scope of the present invention.

Further, in one embodiment, the precast pile 210 includes a hollow portion 211, a solid portion 212, and a first cage 213, the hollow portion 211 being connected to the solid portion 212; a core groove 214 is formed in the hollow part 211, and the first cage 213 is arranged in the hollow part 211 and the solid part 212; the pile cover 10 is fitted around the peripheral wall of the hollow portion 211 or the solid portion 212, and the folded edge 20 abuts against the end of the hollow portion 211 or the solid portion 212.

Specifically, the core slot 214 is a blind slot, the inner wall surface of the blind slot is a cylindrical surface, the first cage 213 includes a plurality of first axial reinforcing bars extending along the axial direction of the precast pile 210 and a first radial reinforcing bar connected to and annularly disposed on the first axial reinforcing bars, and the first axial reinforcing bar and the first radial reinforcing bar enclose to form the first cylindrical cage 213. The outer diameter of the first cage 213 is smaller than that of the precast pile 210 and larger than the inner wall aperture of the core groove 214, so that the first cage 213 is fixedly disposed in the hollow portion 211 and the solid portion 212 and is fixedly connected with the concrete material.

So set up, precast pile 210 is local hollow precast pile, and the perisporium of local hollow precast pile is located to pile body angle bead cover 100 cover to can protect the concrete material of local hollow precast pile tip, prevent that its damage from droing, with reliability and the durability that improves local hollow precast pile.

Further, in another embodiment, the precast pile 210 further includes a second cage 215, and the second cage 215 is disposed in the solid portion 212.

Specifically, the core slot 214 is a blind slot, the inner wall surface of the blind slot is a cylindrical surface, the first cage 213 includes a plurality of first axial reinforcing bars extending along the axial direction of the precast pile 210 and a first radial reinforcing bar connected to and annularly disposed on the first axial reinforcing bars, and the first axial reinforcing bar and the first radial reinforcing bar enclose to form the first cylindrical cage 213. The outer diameter of the first cage 213 is smaller than the outer diameter of the precast pile 210 and larger than the inner wall aperture of the core groove 214, so that the first cage 213 is fixedly arranged in the hollow part 211 and the solid part 212 and is fixedly connected with the concrete material; the second cage 215 has an outer diameter smaller than that of the first cage 213, and is thus housed within the first cage 213 and is fixedly connected to the concrete material.

In this arrangement, the precast pile 210 is a locally reinforced hollow precast pile, and the pile body corner protection sleeve 100 is sleeved on the peripheral wall of the locally reinforced hollow precast pile, so that the concrete material at the end part of the locally reinforced hollow precast pile can be protected, the concrete material is prevented from being damaged and falling off, and the reliability and the durability of the locally reinforced hollow precast pile are improved; in addition, the arrangement of the second cage 215 increases the local reinforcement ratio of the solid portion 212, so that the tensile strength, the compressive strength, the shear strength and the durability of the precast pile 210 are further improved, and particularly, the performance of the precast pile 210 against earthquake shock waves is enhanced, so that the earthquake resistance of the precast building structure 200 is improved.

Further, in one embodiment, the prefabricated building structure 200 further includes a pre-embedded connector 70, the pre-embedded connector 70 is disposed at an end of the first axial steel bar along the axial direction of the prefabricated pile 210, and a thread is disposed on the pre-embedded connector 70.

With the arrangement, during building construction, the threaded pre-embedded connecting piece 70 is convenient to be connected with axial ribs of other prefabricated building structures, so that a plurality of prefabricated building structures can be spliced and matched for use to prolong the length of the prefabricated building structure 200, or a bearing platform is poured after connecting reinforcing steel bars at the top of the prefabricated building structure 200 to bear an upper-layer building; the pre-buried connector 70 can also increase the bonding rate between the two prefabricated building structures 200; or the reinforcement ratio of the bearing platform is improved, the connection mode between the prefabricated building structure 200 and the bearing platform is simplified, the force transmission link in the stress process is reduced, the integral vertical stress capacity of the prefabricated building structure 200 is improved, and the mechanical property of the prefabricated building structure 200 and the bearing platform is guaranteed. Moreover, the pre-embedded connecting piece is more convenient for the tensioning machine to be stably connected with the axial reinforcement body, so that the tensioning machine can pre-stretch the precast pile 210, and the first axial reinforcement can obtain a certain pre-stress.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a positioning ring 61 according to an embodiment of the present invention.

Further, in one embodiment, the precast pile 210 further includes a pre-embedded connector 70, the pre-embedded connector 70 is located at an end of the precast pile 210 and is sleeved with the quick docking assembly 220; the pile body corner protecting sleeve 100 further comprises a positioning ring 61, and the positioning ring 61 is fixedly connected to the return folding edge 20 and sleeved with the embedded connecting piece 70.

In the preferred embodiment of the invention, the retaining ring 61 is welded to the return flange 20. In other embodiments, the positioning ring 61 may also be integrally formed with the pile corner protector 100.

Specifically, the positioning ring 61 is flat and includes a collar portion having a circular through hole and a connecting portion integrally connected to the collar portion; the sleeve ring part is parallel to the radial plane of the pile body corner protection sleeve 100, and the connecting part is fixed with the inflection edge 20 in a welding mode. The pre-buried connector 70 is in a hollow tubular shape and extends into the end of the precast pile 210. As shown in fig. 7, after the two precast piles 210 are butted, one end of the pre-embedded connector 70 in one of the precast piles 210 is sleeved on and limits the first axial steel bar of the first cage 213, and the other end is sleeved on the first inserting platform 221 of the fast butting assembly 220; one end of the pre-buried connecting piece 70 in the other precast pile 210 is sleeved with the first axial steel bar of the first cage 213 and is limited, and the other end is sleeved with the first base 222 of the quick butt joint component 220; the positioning rings 61 on the pile body corner protection sleeves 100 of the two precast piles 210 are respectively sleeved with the embedded connecting pieces 70 in the two precast piles 210 through the ring sleeving parts.

With such an arrangement, the pile body corner protector 100 is fixed in relative position with the first cage 213 through the positioning ring 61, so as to further ensure that the relative positions of the precast piles 210 butted with each other are fixed, which is helpful for enhancing the connection strength between the pile body corner protector 100 and the precast piles 210, and preventing the pile body corner protector 100 from being dislocated, deflected or even deformed relative to the precast piles 210 when the prefabricated building structure 200 is in service.

In order to prevent the welding position between the positioning ring 61 and the folded edge 20 from being broken due to the stress of the pile body corner protecting sleeve 100, one side of the connecting part of the positioning ring 61 is inwards sunken and forms a smooth welding concave surface; one side of the return folding edge 20 close to the axis of the pile body corner protecting sleeve 100 is provided with a welding transition surface matched with the welding concave surface, and the welding transition surface is smoothly arranged.

By the arrangement, the concentrated or uneven stress at the welding position of the connecting part of the positioning ring 61 and the folded edge 20 can be reduced, and the cracking of the welding part between the connecting part and the folded edge 20 caused by the preformed pile 210 in service or bearing process can be avoided; in addition, the mutually matched welding concave surface and welding transition surface can increase the welding contact area of the positioning ring 61 and the folded edge 20, thereby improving the connection reliability of the positioning ring 61 on the pile body corner protection sleeve 100, avoiding the fracture and failure of the positioning ring 61 and improving the bearing or anti-seismic performance of the positioning ring 61.

Still further, the positioning ring 61 and the embedded connector 70 may be fixed by sleeving or welding after sleeving. It is also understood that in other embodiments, the positioning ring 61 may be directly sleeved on the quick-acting coupling assembly or the first axial reinforcing steel bar without the embedded connector 70. As long as the position between the pile corner protector 100 and the first cage 213 can be relatively fixed by the positioning ring 61.

Furthermore, there may be one or more positioning rings 61, and each positioning ring 61 is sleeved with an embedded connector 70 or a first axial steel bar to achieve a better fixing purpose.

In one embodiment, the pretensioning process for the first cage 213 in the prefabricated building structure 200 is: welding one end of the connecting part of the positioning ring 61, which is relatively far away from the sleeve part, on the return folding edge 20 on the pile body corner protector sleeve 100, sleeving and fixing the other end on the pre-embedded connecting piece 70, then connecting the pre-embedded connecting piece 70 with the end plate, wherein the positioning ring 61 cannot be separated from the pre-embedded connecting piece 70 after the connection, so that the position between the pile body corner protector sleeve 100 and the first cage body 213 is relatively fixed; and then moving the end plate to realize tensioning.

Please refer to fig. 2 again, and refer to fig. 5. In one embodiment of the present invention, the end of the pile body corner protection sleeve 100 relatively far away from the return flange 20 forms a flared part 30, and the outer dimension of the flared part 30 is larger than that of the precast pile 210.

When the precast pile 210 is a cylindrical tubular pile, the reinforcement cage is first placed in a mold for forming the precast pile 210, the mold includes an upper mold and a lower mold, the cross section of which is semicircular, the pile angle bead sleeve 100 is sleeved and fixed at the end of the reinforcement cage, and then concrete is poured into the semicircular groove of the lower mold. After concrete is filled, the upper die and the lower die are closed to form a cylindrical pipe shape, the upper die and the lower die are fastened through threads, the reinforcement cage body is tensioned, then the die is arranged on a centrifugal mechanism to enable the die to rotate along the axis, the concrete is thrown to the edge of the inner wall surface of the die due to the centrifugal action during rotation, a cylindrical cavity is formed in the center of the die, and therefore the concrete is fully combined with the reinforcement cage body and the pile body corner protection sleeve 100 to form the hollow cylindrical pipe pile. The cylindrical pipe pile produced by adopting the concrete centrifugal forming mode has the advantages of more compact concrete, higher compressive strength and obvious water-resistant and corrosion-resistant effects.

So set up, pile body angle bead cover 100 can be applicable to hollow cylinder tubular pile better. When the precast building structure 200 is produced by using a concrete centrifugal forming method, the flared portion 30 can abut against an inner wall surface of an external mold for forming the precast pile 210 and slightly deform so as to more closely adhere to the inner wall surface of the external mold, so that concrete or slurry can be prevented from flowing to the pile sleeve 10 from an opening of the pile body corner protector 100, and concrete leakage is prevented from polluting the external mold or the pile body corner protector 100.

The prefabricated building structure 200 provided by the invention has better reliability and durability, the peripheral wall and the end part of the prefabricated pile 210 can be more tightly sleeved and wrapped by the pile body corner protection sleeve 100, and the concrete of the prefabricated pile 210 is fixed on the inner wall of the pile body corner protection sleeve 100, so that the concrete material at the end part of the prefabricated pile 210 can be prevented from being broken and falling off; in addition, when the pile driver strikes the precast pile 210, the pile body corner protection sleeve 100 can be more stably sleeved at the end of the precast pile 210 without sliding downwards, which is more beneficial to sinking pile type construction operation; in addition, compared with the existing prefabricated building structure, the prefabricated building structure 200 provided by the invention does not need to use an end plate, and a plurality of prefabricated building structures 200 can be directly abutted through the end parts to prevent the end plate from contacting with the metal material of the reinforcement cage body, so that the risk of electrochemical corrosion between the end plate and the reinforcement cage body is reduced.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.

Claims

1. A pile body corner protection sleeve (100) comprises a pile sleeve (10) for sleeving the peripheral wall of a precast pile (210); the pile sleeve is characterized in that a notch is formed in the end of the pile sleeve (10), and the end of the pile sleeve (10) is bent towards the axis direction of the pile sleeve (10) to form a return folding edge (20).

2. The pile corner protector (100) of claim 1, wherein the return edge (20) is integrally formed with the pile sleeve (10).

3. The pile body corner protector (100) according to claim 1, wherein the return edge (20) is formed by extending from the end of the pile sleeve (10) to the axial direction of the pile sleeve (10), and the length of the return edge (20) is 1 cm-10 cm.

4. A prefabricated building structure (200) comprising a precast pile (210); the prefabricated building structure (200) is characterized by further comprising the pile body corner protection sleeve (100) as claimed in any one of claims 1 to 4, wherein the pile body corner protection sleeve (100) is sleeved on the peripheral wall of the prefabricated pile (210), and the return folding edge (20) abuts against the end part of the prefabricated pile (210).

5. The prefabricated building structure (200) of claim 4 wherein said return edge (20) is flush with the end of said precast pile (210); or the included angle between the return folding edge (20) and the pile sleeve (10) is smaller than 90 degrees, and the return folding edge (20) extends into the end part of the precast pile (210).

6. The prefabricated building structure (200) of claim 4, wherein said prefabricated building structure (200) further comprises a plurality of quick-docking assemblies (220), two of said prefabricated piles (210) being dockable by said plurality of quick-docking assemblies (220), said return flange (20) surrounding the shape enclosed by said plurality of quick-docking assemblies (220).

7. The precast building structure (200) of claim 4, characterized in that the precast pile (210) comprises a hollow portion (211), a solid portion (212) and a first cage body (213), the hollow portion (211) being connected to the solid portion (212); a core groove (214) is formed in the hollow portion (211), and the first cage body (213) is arranged in the hollow portion (211) and the solid portion (212); the pile sleeve (10) is sleeved on the peripheral wall of the hollow portion (211) or the solid portion (212), and the return folding edge (20) abuts against the end portion of the hollow portion (211) or the solid portion (212).

8. The prefabricated building structure (200) of claim 7 wherein said precast pile (210) further comprises a second cage (215), said second cage (215) being disposed within said solid portion (212).

9. The prefabricated building structure (200) of claim 6, wherein said precast pile (210) further comprises a pre-buried connector (70), said pre-buried connector (70) being located at an end of said precast pile (210) and sheathing said quick docking assembly (220); the pile body corner protector sleeve (100) further comprises a positioning ring (61), and the positioning ring (61) is fixedly connected to the pile body corner protector sleeve (100) and sleeved with the embedded connecting piece (70).

10. Prefabricated building structure (200) according to any of the claims 5 to 9, characterized in that said prefabricated pile (210) is a square pile, said pile sleeve (10) having a rectangular cross-sectional shape, taken along a direction perpendicular to the axis; alternatively, the first and second electrodes may be,

precast pile (210) are the tubular pile, the shape that pile cover (10) dissected along the direction of perpendicular to axis is circular.