CN217758727U - Precast concrete pile - Google Patents

Abstract

The utility model provides a precast concrete pile, including first connecting pile and second connecting pile, the end of the whole or partial main muscle of second connecting pile stretches out the terminal surface of second connecting pile, forms main muscle extension, is equipped with the connecting pipe in the pile body of first connecting pile, and the port of connecting pipe is towards the pile body terminal surface outside, and main muscle extension can insert the connecting pipe through the port and glue through the structure and connecting pipe fixed connection; the length of the main rib extension part of the second connecting pile is more than or equal to three times of the diameter of the corresponding main rib, and the length of the main rib extension part is less than or equal to the length of the inner space of the connecting pipe. The utility model discloses a concrete pile connection structure and precast concrete pile have realized that real stake main muscle is coaxial, unanimous connection, and the intensity of connecting portion is stronger than the intensity of main muscle itself, have guaranteed the integrality of being become the stake after connecting, under the prerequisite that the bearing capacity can satisfy the construction requirement completely, have really realized that shear resistance, bending resistance and the resistance to plucking performance of a stake are optimal.

Description

Precast concrete pile

Technical Field

The utility model relates to a building prefab field especially relates to a precast concrete pile.

Background

In the field of building engineering, a precast concrete pile is a common precast member, and China is one of the countries with the largest concrete pile yield, the largest variety and the widest application range. According to statistics, the output of the precast concrete pile in China in 2020 is 45362 kilometers, and the increase is 5.44% on the same scale. Meanwhile, higher requirements are put forward on the vertical bearing capacity and the comprehensive properties of bending resistance, shearing resistance and pulling resistance of the pile.

In the prior art, the pile end plates of the precast concrete piles need to be welded, so that the connection reliability of the piles is ensured, and the infiltration of underground water is avoided. Under the corrosive environment and the corrosion time, the performance of the precast pile is greatly reduced due to the rusty expansion cracks caused by the corrosion of the steel bars. And the end plate welding construction efficiency is low, and the environment is polluted. Therefore, in order to obtain a better construction effect, a precast concrete pile having a new type of connection structure is urgently required to be developed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a precast concrete pile to overcome above-mentioned problem.

A precast concrete pile comprises a first connecting pile and a second connecting pile, wherein the end part of all or part of main reinforcements of the second connecting pile extends out of the end surface of the second connecting pile to form a main reinforcement extending part;

the length of the main rib extension part of the second connecting pile is more than or equal to three times of the diameter of the corresponding main rib, and the length of the main rib extension part is less than or equal to the length of the inner space of the connecting pipe.

Further, the first connecting pile and the second connecting pile are both hollow square piles.

Further, the first and second connection piles comprise first and second cross-sectional sections, which are different in shape and/or area.

Furthermore, the main rib extending parts are symmetrically or uniformly distributed.

Furthermore, the end part of the connecting pipe is provided with a flange which is inward in the radial direction, so that a limiting hole which can limit the steel bar heading is formed.

Furthermore, the connecting pipe comprises a connecting pipe main body and a connecting part used for being connected with the main rib, the connecting part is a flange which is inward in the radial direction, the flange can limit the upset head of the main rib in the connecting pipe main body, and the length of the connecting pipe main body is more than 60 mm.

Further, still be equipped with elastic component, stop part in the connecting tube that is equipped with the card firmware, the card firmware includes the card firmware main part of fixing in the connecting tube through the screw thread and sets up the elasticity card more than two on the card firmware main part, the elasticity card passes through the stop part will the elastic component compression is in the connecting tube, main muscle can pass between the elasticity card more than two and realize the joint through the resilience of elasticity card, just main muscle can destroy the stop part, make the elastic component tip block through resilience card between elasticity card and the connecting tube.

Furthermore, at least three connecting pipes are internally provided with clamping pieces for clamping the extending parts of the main ribs, and the connecting pipes provided with the clamping pieces are symmetrically distributed or uniformly distributed.

Furthermore, the first connecting pile and the second connecting pile are square piles, the first connecting pile is provided with four connecting pipes provided with clamping pieces, and the connecting pipes provided with the clamping pieces are arranged at four corners of the cross section of the square pile.

Further, first connecting pile and second connecting pile are the tubular pile, first connecting pile has three connecting pipes that are equipped with the card and fix the piece, is equipped with the connecting pipe edge of card and fix the piece tubular pile cross section circumference equipartition.

The utility model discloses a precast concrete pile, compare with prior art, a concrete pile connection structure and precast concrete pile realized real coaxial, the unanimous connection of stake owner muscle, and the intensity of connecting portion is stronger than the intensity of owner muscle itself, guaranteed the integrality of connecting the back and forming the stake, under the prerequisite that the bearing capacity can satisfy the construction requirement completely, really realized that shear resistance, bending resistance and the resistance to plucking performance of a stake are optimal. The utility model discloses glue fixed connection through the engineering structure in the junction, the engineering is glued and is all possessed fine corrosion resisting property usually, therefore still has very strong corrosion resistance after this precast concrete stake becomes the stake concurrently.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural view of a precast concrete pile disclosed in embodiment 1 of the present invention;

fig. 2 is a schematic top view of a precast concrete pile disclosed in embodiment 1 of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view taken from the perspective A-A of FIG. 2;

fig. 4 is a schematic structural view of a precast concrete pile disclosed in embodiment 2 of the present invention;

fig. 5 is a schematic top view of a precast concrete pile disclosed in embodiment 2 of the present invention;

FIG. 6 is a cross-sectional view taken at angle B-B of FIG. 5;

FIG. 7 is a cross-sectional view taken from the perspective E of FIG. 6;

fig. 8 is a schematic structural view of a precast concrete pile disclosed in embodiment 3 of the present invention;

fig. 9 is a schematic top view of a precast concrete pile disclosed in embodiment 3 of the present invention;

FIG. 10 is a cross-sectional view at angle C-C of FIG. 9;

fig. 11 is a sectional view taken from a view angle F of fig. 10;

fig. 12 is a schematic view of a connecting pipe structure provided with a fastener according to embodiment 1 of the present invention;

fig. 13 is a schematic view of a connecting pipe structure provided with a fastener according to embodiment 1 of the present invention, which is shown in the state of inserting a main reinforcement of a second connecting pile;

fig. 14 is a schematic structural view of a precast concrete pile disclosed in embodiment 3 of the present invention;

fig. 15 is a schematic side view of a precast concrete pile disclosed in embodiment 3 of the present invention;

fig. 16 is a schematic top view of a precast concrete pile disclosed in embodiment 3 of the present invention;

FIG. 17 is a cross-sectional view taken from perspective D-D of FIG. 16;

fig. 18 is a sectional view taken from the perspective G of fig. 17;

in the figure:

1. a first main rib; 2. a second main rib; 3. a connecting pipe; 4. an elastic member; 5. a stopper; 6. a clamping and fixing piece; 7. a first connecting pile; 8. a second connecting pile; 11. the main rib extends out.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

As shown in fig. 1 to 3, a precast concrete pile includes a first connecting pile 7 and a second connecting pile 8, wherein the end portions of all main reinforcements of the second connecting pile 8 extend out of the end surface of the second connecting pile 8 to form a main reinforcement extension portion 11, a connecting pipe 3 is arranged in the pile body of the first connecting pile 7, the port of the connecting pipe 3 faces the outer side of the end surface of the pile body, and the main reinforcement extension portion 11 can be inserted into the connecting pipe 3 through the port and is fixedly connected with the connecting pipe 3 through structural glue;

the length of the main bar extension 11 of the second connecting pile 8 is greater than or equal to three times the diameter of the corresponding main bar, and the length of the main bar extension 11 is less than or equal to the length of the inner space of the connecting pipe 3.

In this embodiment, the main reinforcements include a first main reinforcement 1 and a second main reinforcement 2, the first main reinforcement 1 is arranged in the first connecting pile 7, the second main reinforcement 2 is arranged in the second connecting pile, and all the main reinforcements are uniformly distributed, so that the pre-pressure of the prestressed pile is equivalent and the pre-pressure is the same, the balanced pressure application is ensured, and the optimal quality of the pile is ensured. In this embodiment, the second connecting pile and the first connecting pile are both hollow square piles. During actual production, the second connecting pile can only set up one end owner muscle according to actual need and stretch out, and first connecting pile can only set up one end and be equipped with the connecting pipe, also can all set up second connecting pile and first connecting pile into the structure that one end was equipped with the connecting pipe, one end owner muscle stretches out, and that is exactly the second connecting pile is the same with first connecting pile structure. In other words, when the first connecting pile is used as the bottom-most pile, the upper end of the first connecting pile can be sequentially connected with one or more sections of second connecting piles according to the requirement, and the connecting structure of the bottom-most pile and the next bottom-most pile or the connecting structure between other piles except the bottom-most pile is all within the protection scope of the utility model.

The connecting pipe 3 comprises a main body of the connecting pipe 3 and a connecting part used for being connected with the main rib, the connecting part is a flange which is inward in the radial direction, the flange can limit the heading of the main rib in the main body of the connecting pipe 3, and the length of the main body of the connecting pipe 3 is more than 60 mm. In this embodiment, the one end that the pile body terminal surface was kept away from to the connecting pipe is for can carrying out spacing hole to the reinforcing bar upset head, and spacing hole has the flange is spacing to the pier nose of main muscle.

Example 2

As shown in fig. 4 to 7, in this embodiment, each of the first connecting pile 7 and the second connecting pile 8 is a bamboo solid square pile, each of the first connecting pile 7 and the second connecting pile 8 includes a first cross-sectional section and a second cross-sectional section, each of the first cross-sectional section and the second cross-sectional section is rectangular, but the first cross-sectional section and the second cross-sectional section have different areas, and the large cross-sectional section and the small cross-sectional section are in transition through an inclined plane.

In this embodiment, the cross-sectional width and the interface length of the first cross-sectional segment are both greater than the second cross-sectional segment, or the first cross-sectional segment may be set to have only the cross-sectional width or the length greater than the second cross-sectional segment, and the length or the width of the first cross-sectional segment is less than or equal to the second cross-sectional segment. In other words, the sectional area of the first section is equal to the sectional area of the second section but the length-width ratio of the two sections is different, or the sectional area of the first section is larger than the sectional area of the second section and the sectional width and the sectional length of the first section are both larger than the sectional width and the sectional length of the second section, or the sectional area of the first section is larger than the sectional area of the second section and the sectional width or the sectional length of the first section is larger than the sectional width and the sectional length of the second section.

The connecting pile in the embodiment comprises a pile body, all main reinforcements of the second connecting pile and the first connecting pile are PC steel bars, one end of each main reinforcement is connected with the connecting pipe 3, the other end of each main reinforcement extends out of the end face of the precast concrete pile to form a main reinforcement extending part 11, and then a splicing part for pile connection is formed, the connecting pipe 2 is arranged in the pile body, one end port, far away from the main reinforcement, of the connecting pipe faces the outer side of the end face of the pile body, the end port of the connecting pipe forms a sleeve part for pile connection, the length of the main reinforcement extending part 11 is larger than or equal to three times of the diameter of the main reinforcement, the length of the inner space of the connecting pipe 2 is larger than or equal to three times of the diameter of the main reinforcement, and the length of the main reinforcement extending part 11 is smaller than or equal to the length of the inner space of the connecting pipe 2. In the embodiment, all the main reinforcements 1 are uniformly and symmetrically distributed, so that the pre-pressure of the pre-stressed pile is equivalent and the pre-pressure is the same, the balanced pressure application is ensured, and the optimal quality of the pile is ensured. In this embodiment, the bottom of first connecting pile is equipped with the stretch-draw sleeve that links to each other with the main muscle. The other structure of this embodiment is the same as embodiment 1.

Example 3

As shown in fig. 8-11, in the present embodiment, the first connecting pile 7 and the second connecting pile 8 are both hollow bamboo joint square piles, in the present embodiment, the first connecting pile 7 has four connecting pipes 3 provided with clamping members, and the connecting pipes 3 provided with the clamping members are disposed at four corners of the cross section of the square pile.

When connecting the precast concrete pile to this embodiment, the structure is glued in pouring into to the sleeve part of stake connection, then inserts the socket part of stake connection with the grafting portion of stake connection in the sleeve part of stake connection, when the structure is glued and is not solidified yet, the setting of card firmware plays the effect of temporary connection, and the reaction force when avoiding piling makes the stake throw off, appears the gap, is convenient for construct fast, guarantees the engineering progress.

As shown in fig. 12 and 13, an elastic member 4 and a stop member are further disposed in the connecting pipe 3 provided with the clamping member, the clamping member includes a clamping member main body fixed in the connecting pipe 3 through a thread and two or more elastic clamping pieces disposed on the clamping member main body, the elastic clamping pieces compress the elastic member 4 in the connecting pipe 3 through the stop member, the main rib can penetrate through the two or more elastic clamping pieces and realize clamping through resilience of the elastic clamping pieces, and the main rib can break the stop member, so that the end portion of the elastic member 4 is clamped between the elastic clamping pieces and the connecting pipe 3 through resilience.

Specifically, an end of the elastic tab faces the first main rib connecting portion, and a distance between the end of the elastic tab and the open end of the connecting pipe 3 is greater than or equal to 60% of the length of the connecting pipe 3. The second owner muscle is the PC rod iron, and the rod iron heading can radially strut a plurality of elasticity cards 62 and pass, and later the elasticity card kick-backs, blocks the rod iron heading, realizes the joint, and the rod iron passes the elasticity card, can destroy the stop member.

In this embodiment, elastic component 4 is the spring, stop member 5 is the rupture disk, the pier nose of second owner muscle 2 passes destroy behind the elasticity card the rupture disk makes the tip card of spring is gone into between elasticity card and the 3 inner walls of connecting pipe after kick-backing.

As shown in fig. 7, the stop member 5 includes a plurality of stopping pieces arranged annularly, the outer side of each stopping piece is annularly provided with an inner concave portion, the end portion of the elastic member 4 is clamped into the inner concave portion, the pier head extends into the connecting pipe to the stopping piece, so that the stopping piece 51 is broken, the stopping is failed, the spring rebounds, the end portion of the spring is clamped between the connecting pipe and the elastic clamping piece, the elastic clamping piece cannot be opened, the pier head of the second main rib cannot be retracted, and the first connecting pile and the second connecting pile are firmly and reliably connected.

The first connecting pile and the second connecting pile in the embodiment realize quick connection of the main reinforcements, and the elastic part is clamped between the clamping part and the connecting pipe, so that the clamping part can firmly clamp the pier head of the main reinforcements, the main reinforcements cannot return, gaps between precast concrete piles are eliminated, underground water corrosion is avoided to the maximum extent, and safety is improved. The other structure of this embodiment is the same as embodiment 2.

Example 4

As shown in fig. 14 to 18, a difference between this embodiment and embodiment 3 is that the first connecting pile and the second connecting pile in this embodiment are bamboo joint hollow pipe piles, in this embodiment, the first connecting pile 7 has three connecting pipes 3 provided with the clamping members, and the connecting pipes 3 provided with the clamping members are uniformly distributed along the circumferential direction of the cross section of the pipe pile, in other words, an included angle between any two connecting pipes 3 provided with the clamping members and a connecting line of circle centers of the cross section of the pile body is 120 °, so that a uniform connection force of the clamping members to the pile body is ensured. The other structure of this embodiment is the same as embodiment 3.

Example 5

In this embodiment, the second connecting pile and the first connecting pile are pre-stressed and non-pre-stressed mixed piles, one end of a part of main reinforcements is connected with the connecting pipe, the rest of main reinforcements are pre-stressed main reinforcements, tensioning sleeves are arranged at two ends of each pre-stressed main reinforcement and are also used as connecting sleeves, the precast concrete pile is a pre-stressed and non-pre-stressed mixed pile, a part of main reinforcements extend out of the end face of the precast concrete pile, the length of each main reinforcement of the precast concrete pile is required to be consistent, the pre-stress of each main reinforcement is ensured to be uniform and consistent, the length of each non-pre-stressed main reinforcement is not limited by the length of the non-pre-stressed main reinforcement, and the pre-stressed main reinforcement is set according to actual requirements. The connecting pipe structure of this embodiment is the same as that of the first embodiment, and the tensioning sleeve is a sleeve-shaped structure provided with internal threads. When the main reinforcement bears the prestress, the connecting sleeve and the connecting pipe can be used for tensioning the main reinforcement in the production process.

Example 6

The difference between this embodiment and embodiment 1 is that the other end of the partial main muscle of second connecting pile stretches out the terminal surface of precast concrete pile, forms main muscle stretching part 11, and then forms the grafting portion that the stake is connected, and the both ends of the remaining main muscle of second connecting pile are equipped with connecting sleeve, connecting sleeve is for being equipped with internal screw thread sleeve column structure. If the precast concrete pile is a prestressed pile, part of the main reinforcement extends out of the end face of the precast concrete pile, the length of each main reinforcement of the precast concrete pile is required to be consistent, that is, the length of the main reinforcement extending out of the end face of the precast concrete pile is consistent with that of the main reinforcement not extending out of the end face, and the pre-pressure of each main reinforcement is ensured to be uniform. If the precast concrete pile is a non-prestressed pile, the lengths of all the main reinforcements are not limited by the consistent length. The main rib extending parts are symmetrically distributed or uniformly distributed. Therefore, the mechanical property of the pile can be ensured, the pre-stress of the pre-stressed pile is equivalent and the pre-stress is the same, and the balanced pressure application is ensured. When this embodiment is prestressed pile, connecting sleeve and connecting pipe all are used for the stretch-draw of main muscle in process of production. Correspondingly, one end of part of the main bars of the first connecting pile 7 is connected with a connecting pipe, the port of the connecting pipe forms a sleeve part connected with the pile, two ends of the rest of the main bars of the first connecting pile are provided with connecting sleeves, the connecting sleeves are sleeve-shaped structures provided with internal threads, and other structures of the embodiment are the same as those of the first embodiment.

In this embodiment, the stretch-draw sleeve 3 internal fixation of second connecting pile 5 has the inserted bar, and the stretch-draw sleeve 3 internal fixation of first connecting pile has joint portion, the inserted bar can insert joint portion and realize the joint, that is to say, is equipped with mechanical joint 4 between the stretch-draw sleeve 3 of second connecting pile 5 and first connecting pile 6. The quick connection mechanical joint is connected with a main reinforcement which does not extend out of the end face of the precast concrete pile through a connecting sleeve. In this embodiment, the mechanical joint is provided: during construction, structural adhesive is poured into the sleeve part connected with the pile, then the inserting part connected with the pile is inserted into the sleeve part connected with the pile, and when the structural adhesive is not solidified, the mechanical joint plays a temporary connection role, so that rapid construction is facilitated, and the engineering progress is ensured. The mechanical joints are evenly distributed, ensuring that the force distribution is balanced. All main reinforcement extending parts are also uniformly distributed, so that the mechanical property of the pile can be ensured, the equivalent prepressing force of the prestressed pile can be ensured to be the same, the balanced pressing is ensured, and the optimal quality of the pile is ensured.

Besides the above structural forms, the mechanical joint may be any existing mechanical joint, including but not limited to a precast concrete pile quick joint disclosed in patent [ 2015204447851 ], a mechanical splicing joint disclosed in [ 2015207122349 ], a castellated joint mechanical joint disclosed in [ 2015206485006 ], a precast concrete member plug joint disclosed in [ 201620008421.3 ], a precast concrete member mechanical joint disclosed in [ 201621106867.6 ], a concrete assembled structural member plug joint disclosed in [ 201720863564.7 ], a concrete member connection joint disclosed in [ 201821045918.8 ], a concrete member mechanical joint disclosed in [ 201810847677.7 ], a precast concrete member mechanical joint disclosed in [ 5657 z5657 ] a precast concrete member joint, an elastic tooth mechanical joint [ 3264 zxft 3282 ], a mechanical joint disclosed in [ 3434 ] and a tooth joint 3482.

Example 7

The embodiment discloses a precast concrete pile, which comprises a first connecting pile, a second connecting pile and a connecting structure thereof in any one of the embodiments.

The concrete pile connection structure of each embodiment of the application realizes coaxial and consistent connection of main pile-forming reinforcements (as shown in fig. 3, fig. 6, fig. 7, fig. 10, fig. 11, fig. 17 and fig. 18, after pile forming, the main reinforcements of all single-section piles are connected into a whole through the connection mode disclosed by the patent), and the strength of the connection part is stronger than that of the main reinforcement (as shown in table 1, table 2 and table 3, the test result of the prefabricated concrete pile connection structure in the patent shows that the strength of the connection part is stronger than that of the main reinforcement when the connection part is subjected to crack resistance shear test, bending resistance test and tensile test, the connection pipe is arranged in the pile body, and the port of one end of the connection pipe, which is far away from the main reinforcement, faces the outer side of the end face of the pile body, the connection pipe plays a role of the main reinforcement in the pile body, and the strength of the main reinforcement is far higher than that of the main reinforcement; because the joints are fixedly connected through the engineering adhesive, the engineering adhesive generally has good corrosion resistance, so that the precast concrete pile has strong corrosion resistance after being formed.

During construction, the sleeve parts connected with the piles are filled with structural adhesive, and then the inserting parts connected with the piles are inserted into the sleeve parts connected with the piles to be fixedly connected. The magnitude of the connection force between the single piles at this time is evaluated by calculation through the bond strength. The greater the bond strength is generally determined by r = p/3.14 dL. p is the pull-out force, d, the bar diameter, L, the bar embedment length. Wrapping force: generally expressed in terms of bond strength of concrete. The physical quantity of the concrete resisting the steel bar slipping capacity is expressed by dividing its slipping force by the bond area (mpa), and in general, the bond strength refers to the shear stress along the contact surface between the steel bar and the concrete, i.e. the bonding stress. In fact, the stress and deformation state of concrete around the reinforcing steel bar are complex, and the bond strength changes with the bond length of the reinforcing steel bar, so the bond strength changes with the type of the reinforcing steel bar, the appearance shape, the embedding position in the concrete and the direction, and is also related to the strength of the concrete, namely the higher the compressive strength of the concrete. The strength of the engineering glue is usually several times of that of concrete, so that the engineering glue with the strength of pile body concrete more than 2 times of that of the engineering glue is selected, and the main reinforcement extends like a sleeve and has effective bonding (connection) length more than or equal to seven times of the diameter of the main reinforcement, so that the requirement of the strength of the joint can be completely met. For verification, experiments are specially carried out before the application of the patent, and the verification results are shown in tables 1, 2 and 3.

Table 1 is this patent the hollow bamboo joint tubular pile experiment record of precast concrete pile, anti split when cutting the experimentation, loading capacity reaches hundredth percent, and the crack does not appear in the junction, and the pile body does not appear the crack. When the load force reaches 110%, no crack appears at the joint when the load is finished, and the pile body has a crack with the width of 0.1 mm for the first time. The strength of the connecting structure is far higher than that of the pile body.

TABLE 1 recording of the crack and shear test of hollow bamboo joint pipe pile

Table 2 is this patent the hollow bamboo joint tubular pile bending test record of precast concrete pile, in the bending resistance experimentation, load capacity reaches when hundredth percent, and the junction does not appear the crack when holding the lotus, and the pile body does not appear the crack. When the load force reaches 115%, no crack appears at the joint when the load holding is finished, and cracks appear for the first time. The strength of the connecting structure is far higher than that of the pile body.

TABLE 2 bending resistance test record of hollow bamboo joint pipe pile

Table 3 shows the tensile load test report of the hollow bamboo joint pipe pile of the precast concrete pile, and in the tensile load test process, in 3 experiments exceeding the standard 125KN, the steel bar is broken when (1) is 165.5KN, (2) is broken when (150.3KN is pier head, and (3) is broken when 162.8KN is provided.

TABLE 3 tensile load test report

Current connected mode can't reach the result of use of this patent all, and traditional supplementary muscle plug-in connection mode exists to assist muscle 4 and directly pegs graft in precast concrete pile owner muscle in the concrete preformed hole 5, glues the two through the structure during the construction, assists muscle 4 and concrete connection, and its pile body connects comprehensive mechanical properties: the shearing resistance, the bending resistance and the pulling resistance are far lower than those of the steel bar, the steel bar is only suitable for pile foundations with vertical bearing capacity requirements, and the connection of main bars on the same axis is not realized; in addition, the construction time is limited by the setting time of the glue. The traditional end plate welding connection meets the requirements of pile-forming shear resistance and bending resistance, but the uplift pile needs to be specially customized; when the electric welding is used for welding connection, the full welding is required to be carried out for three times, and the welding heat can cause secondary damage to concrete and a steel bar pier head. In addition, the construction cost and the welding cost of the anchoring end plates at the two ends of the pile are far higher than the implementation cost of the method, and the precast concrete pile with the end plates at the two ends of the traditional pile also runs against the great trend of 'energy conservation, emission reduction and double carbon policy'; according to the calculation mode of the average pile length of 11 meters in the industry, the output of the precast concrete pile in China is 45362 ten thousand extended meters (a data source, china association for concrete and cement products), which needs about 8247 ten thousand end plates in 2020, namely, about 160 more than ten thousand tons of steel are consumed, and about 100 hundred million expenses are required in conversion, and after the steel is replaced, about 288 ten thousand tons of carbon emission (calculated according to the standard that about 1.8 tons of carbon are emitted per ton of crude steel) can be reduced every year.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.

Claims (14)

1. The utility model provides a precast concrete stake, includes first connecting pile and second connecting pile, its characterized in that:

the end part of all or part of the main reinforcement of the second connecting pile extends out of the end surface of the second connecting pile to form a main reinforcement extension part, a connecting pipe is arranged in the pile body of the first connecting pile, the port of the connecting pipe faces the outer side of the end surface of the pile body, and the main reinforcement extension part can be inserted into the connecting pipe through the port and is fixedly connected with the connecting pipe through structural adhesive;

the length of the main rib extension part of the second connecting pile is more than or equal to three times of the diameter of the corresponding main rib, and the length of the main rib extension part is less than or equal to the length of the inner space of the connecting pipe.

2. The precast concrete pile of claim 1, wherein: and the first connecting pile and the second connecting pile are both hollow square piles.

3. The precast concrete pile of claim 1, wherein: the first and second connection piles comprise first and second cross-sectional sections which are different in shape and/or area.

4. The precast concrete pile of claim 3, wherein: the first connecting pile and the second connecting pile are hollow bamboo joint square piles, solid bamboo joint square piles or hollow bamboo joint tubular piles.

5. The precast concrete pile according to any one of claims 1 to 4, wherein: the main rib extending parts are symmetrically distributed or uniformly distributed.

6. The precast concrete pile of claim 5, wherein: the end part of the connecting pipe is provided with a radial inward flange to form a limiting hole capable of limiting the steel bar heading.

7. The precast concrete pile of claim 6, wherein: the connecting pipe comprises a connecting pipe main body and a connecting part used for being connected with the main rib, the connecting part is a flange which is inward in the radial direction, the flange can limit the upset head of the main rib in the connecting pipe main body, and the length of the connecting pipe main body is more than 60 mm.

8. The precast concrete pile according to any one of claims 1 to 4, wherein: still be equipped with elastic component, stop part and card firmware in the connecting tube, the card firmware includes the card firmware main part of fixing in the connecting tube through the screw thread and sets up two at least elasticity cards in the card firmware main part, the elasticity card passes through the stop part will the elastic component compression is in the connecting tube, the main muscle can pass the elasticity card more than two between and realize the joint through the resilience of elasticity card, just the main muscle can destroy the stop part, make the elastic component tip is blocked into through the resilience card between elasticity card and the connecting tube.

9. The precast concrete pile according to any one of claims 1 to 4, wherein: at least three connecting pipes are internally provided with clamping pieces used for clamping the main rib extending parts, and the connecting pipes provided with the clamping pieces are symmetrically distributed or uniformly distributed.

10. The precast concrete pile according to any one of claims 1 to 4, wherein: the first connecting pile and the second connecting pile are square piles, the first connecting pile is provided with four connecting pipes provided with clamping pieces, and the connecting pipes provided with the clamping pieces are arranged at four corners of the cross section of the square piles.

11. The precast concrete pile according to any one of claims 1 to 4, wherein: first connecting pile and second connecting pile are the tubular pile, first connecting pile has three connecting pipe that is equipped with the card and fixes the piece, is equipped with the connecting pipe edge of card and fix the piece tubular pile cross section circumference equipartition.

12. The precast concrete pile according to any one of claims 1 to 4, wherein: the terminal surface that the stake is connected to the second is stretched out to the part owner muscle of second connection stake, forms main muscle extension, and the end connection of the all the other main muscle of second connection stake has first connecting sleeve, the terminal surface outside of the stake is connected to first connecting sleeve's opening orientation second, first connection stake is equipped with the connecting pipe with main muscle extension corresponding position, and the end connection of the all the other main muscle of first connection stake has the second connecting sleeve, the terminal surface outside of the first connection stake of second connecting sleeve's opening orientation.

13. The precast concrete pile of claim 12, wherein: when the second connecting pile is a prestressed and non-prestressed mixed pile, one end of part of main reinforcements of the second connecting pile is connected with the connecting pipe, the other main reinforcements are prestressed main reinforcements, and two ends of each prestressed main reinforcement of the second connecting pile are provided with tensioning sleeves;

when the first connecting pile is a prestressed and non-prestressed mixed pile, the main reinforcement of the first connecting pile, which corresponds to the extending part of the main reinforcement, is connected with the connecting pipe, the rest main reinforcements are prestressed main reinforcements, and tensioning sleeves are arranged at two ends of the prestressed main reinforcement of the first connecting pile.

14. The precast concrete pile of claim 13, wherein: partial or whole first connecting sleeve internal fixation has the inserted bar, and the second connecting sleeve internal fixation that corresponds the position has joint portion, the inserted bar can insert joint portion and realize the joint.

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