CN216787103U

CN216787103U - High-shear prestressed concrete pile

Info

Publication number: CN216787103U
Application number: CN202220102965.1U
Authority: CN
Inventors: 胡浩林; 王雨桐; 黄新龙
Original assignee: Hubei Jiegu Construction Technology Co ltd
Current assignee: Hubei Jiegu Construction Technology Co ltd
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2022-06-21
Anticipated expiration: 2032-01-14

Abstract

The utility model discloses a high-shear prestressed concrete pile, which comprises a pile body, wherein all main reinforcements of the concrete pile are prestressed main reinforcements, one end of each main reinforcement of the precast concrete pile is connected with a connecting pipe, the other end of each main reinforcement of the precast concrete pile extends out of the end surface of the precast concrete pile to form a main reinforcement extending part, and further form an inserting part for pile connection, the connecting pipe is arranged in the pile body, the port of one end, far away from the main reinforcements, of the connecting pipe faces the outer side of the end surface of the pile body, the port of the connecting pipe forms a sleeve part for pile connection, and a clamping piece for clamping the main reinforcements is arranged in the connecting pipe. The high-shear prestressed concrete pile really realizes the optimal shearing resistance, bending resistance and pulling resistance of one pile, and the using method of the high-shear prestressed concrete pile is fixedly connected at the joint by engineering glue and has strong corrosion resistance.

Description

High-shear prestressed concrete pile

Technical Field

The utility model relates to the technical field of precast concrete piles, in particular to a high-shear prestressed concrete pile.

Background

With the continuous improvement of the economic level of China, the precast concrete pile goes through the rapid development stage from the introduction of advanced products, technologies and processes to the independent and independent research and development of new products and new processes from Japan, and becomes one of the countries with the largest global pipe pile yield, the largest variety, the most complete specification and the widest application range in China at present. According to statistics, the output of the precast concrete pile in China in 2020 is 45362 kilometers, and the yield is increased by 5.44% on year-on-year basis. Meanwhile, higher requirements are provided for the vertical bearing capacity and the comprehensive properties of bending resistance, shearing resistance and pulling resistance of the pile. In order to obtain a better construction effect, the welding connection process of the pile end plate of the precast concrete pile in the prior art cannot effectively guarantee the welding quality due to human factors in engineering practice, and has low construction efficiency and environmental pollution. Therefore, a precast concrete pile of a novel connection structure is urgently needed to be developed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems and researches and designs a high-shear prestressed concrete pile.

The technical means adopted by the utility model are as follows:

the high-shear prestressed concrete pile comprises a pile body, wherein all main reinforcements of the concrete pile are prestressed main reinforcements, one ends of all main reinforcements of the precast concrete pile are connected with a connecting pipe, the other ends of all main reinforcements extend out of the end face of the precast concrete pile to form main reinforcement extending parts, and then inserting parts connected with the pile are formed.

Further, the length of the main bead protrusion is less than or equal to the length of the inner space of the connection pipe.

Furthermore, the clamping piece comprises a clamping piece main body fixed in the connecting pipe through threads and more than two elastic clamping pieces arranged on the clamping piece main body, and the upset head of the main rib can radially expand the more than two elastic clamping pieces, penetrate the space between the more than two elastic clamping pieces and realize clamping through resilience of the elastic clamping pieces.

Furthermore, the inner hole of the connecting pipe is a stepped hole provided with threads, and a stepped surface facing away from the port of the connecting pipe is formed and used for positioning a clamping piece in threaded fit with the large-diameter part of the stepped hole.

Further, 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, the connecting part is a connecting nut fixed on the inner side of the connecting pipe main body through threads.

Furthermore, the end face of one end, facing the inner side of the connecting pipe main body, of the connecting nut is a concave conical surface, and the inner side of the other end of the connecting nut is of a hexagonal hole structure.

Further, the vertex angle of the tapered surface is 120 degrees, and the axial length of the connecting nut is more than 10 mm.

Further, the inner sides of the two ends of the connecting pipe main body are both provided with threads.

When the high-shear prestressed concrete pile is used, 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 then pile sinking construction is carried out.

Compared with the prior art, the high-shear prestressed concrete pile realizes the coaxial and consistent connection of the main pile-forming reinforcing bars, the strength of the connecting part is stronger than that of the main reinforcing bars, the integrity of the connected pile-forming is ensured, and the optimal shearing resistance, bending resistance and pulling resistance of one pile are really realized on the premise that the bearing capacity can completely meet the construction requirement. The application method of the high-shear prestressed concrete pile is characterized in that the joint is fixedly connected through the engineering glue, and the engineering glue generally has good corrosion resistance, so that the precast concrete pile has strong corrosion resistance after being formed.

Drawings

FIG. 1 is a schematic perspective view of a first embodiment of the present invention

Fig. 2 is a bottom view of fig. 1.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a schematic structural diagram of a connection tube according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a connection state according to a first embodiment of the utility model.

Fig. 6 is an enlarged view of fig. 5 at B.

Fig. 7 is a schematic perspective view of a second embodiment of the present invention.

Fig. 8 is a schematic front view of a second embodiment of the present invention.

Fig. 9 is a cross-sectional view C-C of fig. 8.

Fig. 10 is a schematic diagram of a connection state according to a second embodiment of the present invention.

Fig. 11 is a perspective view of a connectable square pile of the prior art.

Fig. 12 is a bottom view of fig. 11.

Fig. 13 is a cross-sectional view taken along line D-D of fig. 12.

Detailed Description

Example one

As shown in fig. 1 to 6, a high shear prestressed concrete pile is a tubular pile, and includes a pile body, all main reinforcements 1 of the precast concrete pile are PC steel bars, all main reinforcements are prestressed main reinforcements, one end of each main reinforcement 1 is connected with a connecting pipe 2, the other end extends out of the end surface of the precast concrete pile to form a main reinforcement extending part 11, and then forms a splicing part for pile connection, the connecting pipe is arranged in the pile body, and one end port of the connecting pipe, which is far away from the main reinforcements, faces the outer side of the end surface of the pile body, the 2 ports of the connecting pipe constitute a sleeve part for pile connection, the length of the main reinforcement extending part 11 is greater than or equal to three times of the diameter of the main reinforcements, and the length of the inner space of the connecting pipe is greater than or equal to three times of the diameter of the main reinforcements. In a preferred embodiment, the length of the bead-extending part 11 is less than or equal to the length of the inner space of the connection pipe 2. In the embodiment, all the main reinforcements 1 are uniformly distributed and have the same length, 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.

As shown in fig. 4, the connecting pipe 2 includes a connecting pipe main body 21 and a connecting portion 22 for connecting with the main bar 1, the connecting portion 22 is a radially inward flange, the flange can limit the upset head of the main bar 1 in the connecting pipe main body 21, and the length of the connecting pipe main body 21 is more than 60 mm. In a preferred embodiment, the connection portion 22 is a connection nut screwed to the inside of the connection pipe body. The terminal surface of coupling nut towards the inboard one end of connecting pipe main part is the toper face of indent, coupling nut's the other end inboard is hexagonal hole structure, and the installation of knob is carried out to convenient to use hexagonal spanner. The vertex angle of the conical surface is 120 degrees, and the axial length of the connecting nut is more than 10 mm. The inner sides of two ends of the connecting pipe main body 21 are provided with threads, one end of the connecting pipe main body is used for installing a connecting nut, the other end of the connecting pipe main body is used for tensioning a main rib and used as a tensioning hole, and the connecting pipe main body can also be provided with internal threads on the whole body, so that the connecting strength of the inserting part and the sleeve part is further enhanced.

All or part of the connecting pipe 2 is internally provided with a clamping piece 23 used for clamping the main rib 1. In this embodiment, the fastening member 23 includes a fastening member main body 231 fixed in the connecting pipe 2 by a thread and two or more elastic fastening pieces 232 arranged on the fastening member main body 231, and the main rib 1 can pass through between the two or more elastic fastening pieces 232 and realize fastening by resilience of the elastic fastening pieces 232. Specifically, elasticity card 232 sets up towards the coupling nut direction, and the owner muscle is the PC rod iron, and the rod iron heading can radially strut a plurality of elasticity cards 232 and pass, and later elasticity card kick-backs, blocks the rod iron heading, realizes the joint. In a preferred embodiment, the inner bore of the connecting tube main body 21 is a stepped bore provided with a thread, forming a stepped surface facing the connecting nut, for axially positioning the retainer 23 threadedly engaged with the large diameter portion. When connecting the precast concrete stake of this embodiment, the structural adhesive is poured into to the sleeve portion of stake connection, then in inserting the sleeve portion of stake connection with the grafting portion of stake connection, when the structural adhesive has not solidified yet, the setting of card firmware plays the effect of temporary connection, is convenient for be under construction fast, guarantees the engineering progress.

Example two

As shown in fig. 7 to 10, a high shear prestressed concrete pile is a solid square pile, and includes a pile body, all main reinforcements 1 of the prefabricated concrete pile are PC steel bars, all main reinforcements are prestressed main reinforcements, one end of each main reinforcement 1 is connected to a connecting pipe 2, and the other end extends out of an end surface of the prefabricated concrete pile to form a main reinforcement extension portion 11, thereby forming a splicing portion for pile connection, the connecting pipe 2 is disposed in the pile body, and a port of one end of the connecting pipe, which is far away from the main reinforcements, faces the outside of the end surface of the pile body, and the port of the connecting pipe forms a sleeve portion for pile connection, the length of the main reinforcement extension portion 11 is greater than or equal to three times the diameter of the main reinforcements, and the length of an internal space of the connecting pipe 2 is greater than or equal to three times the diameter of the main reinforcements. In a preferred embodiment, the length of the bead-extending part 11 is less than or equal to the length of the inner space of the connection pipe 2. In this embodiment, all the main reinforcements 1 are uniformly and symmetrically distributed, and have the same length, so as to ensure that the pre-pressure of the pre-stressed pile is equivalent and the pre-pressure is the same, ensure balanced pressure application, and ensure the optimal quality of the pile. The structure of the connecting tube in this embodiment is the same as that in the first embodiment.

EXAMPLE III

In the method for using the high shear prestressed concrete pile according to the first embodiment and the second embodiment, when the pile is used, structural adhesive is poured into the sleeve part connected with the pile, the inserting part connected with the pile is inserted into the sleeve part connected with the pile, and then pile sinking construction is performed. When the inserted pile is the bottommost pile, the bottom main reinforcement of the inserted pile does not extend out of the end face, the end face can be provided with the tensioning sleeve 3 connected with the main reinforcement, the bottom end can also be provided with a pile tip (including but not limited to a concrete pile tip and a steel pile tip), and the bottom end can also be provided with an end plate 7. One bottom pile may be sequentially connected with one or more precast concrete piles according to embodiments of the present invention. In the construction method, the splicing parts do not need to be assembled on site, and the construction efficiency is high.

The high-shear prestressed concrete pile of each embodiment of the application realizes coaxial and consistent connection of the true pile-forming main reinforcements (as shown in fig. 5, fig. 6 and fig. 10, after pile forming, the main reinforcements of all the single-section piles are connected into a whole in a connection mode of the utility model), the strength of the connection part is stronger than that of the main reinforcement (as shown in tables 1, 2 and 3, the test result of the connection structure of the prefabricated concrete pile in the patent shows that the strength of the connection part at the connection part is stronger than that of the main reinforcement in an anti-cracking shear test, an anti-bending test and a tensile test, the connection pipe is arranged in the pile body, one end port 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, the strength of the connection pipe is far higher than that of the main reinforcement, and the connection pipe replaces a tensioning nut if the main reinforcement is the prestressed main reinforcement, and the connection of the two single piles is in a gapless connection mode, the bearing capacity mainly depends on the structural strength of the pile, so that the bearing capacity of the utility model is not repeated herein and can completely meet the construction requirement), and finally, the optimal shearing resistance, bending resistance and pulling resistance of the pile are really realized; 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, the more commonly determined by r ═ p/3.14 dL. p is the pull-out force, d, the diameter of the steel bar, L, the embedded length of the steel bar. 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 is effectively bonded (connected) with the 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 record of the anti-cracking shear test of the pipe pile

Table 1 is this patent the tubular pile experiment record of precast concrete pile, anti split in the experimentation, when the loading capacity reached hundred percent, the junction did not appear the crack, and the pile body did not appear the crack. When the loading force reaches 110%, no crack appears at the joint when the loading 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 much higher than that of the pile body.

TABLE 2 record of the bending resistance test of the pipe pile

Table 2 is this patent the tubular pile bending test record of precast concrete stake, in the bending resistance experimentation, load capacity reaches when hundredth percent, and the junction does not appear the crack when holding the load, 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 much higher than that of the pile body.

Table 3 is this patent the tubular pile tensile load inspection report of precast concrete pile, among the tensile load inspection process, in 3 experiments that surpass standard 125KN, the reinforcing bar broke when being 165.5KN respectively, reinforcing bar pier head fracture when two 150.3KN, reinforcing bar fracture when three 162.8 KN.

TABLE 3 tensile load test report

Present connected mode can't reach the result of use of this patent, and traditional supplementary muscle plug-in connection mode exists to assist 4 direct concrete preformed hole 5 of pegging graft in the precast concrete stake owner muscle of muscle, as shown in fig. 11 to fig. 13, glues the two through the structure during the construction, assists 4 and concrete connection of muscle, 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 extension meters (data source, China association for concrete and cement products), calculated in 2020, about 8247 ten thousand end plates are needed, namely about 160 ten thousand tons of steel are consumed, about 100 hundred million expenses are needed 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 is emitted per ton of crude steel) can be reduced every year.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides a high shear prestressed concrete pile, includes the pile body, its characterized in that: all main reinforcements of the concrete pile are prestressed main reinforcements, one end of all the main reinforcements of the concrete pile is connected with a connecting pipe, the other end of all the main reinforcements extends out of the end face of the concrete pile to form a main reinforcement extending part, so that a splicing part for pile connection is formed, the connecting pipe is arranged in the pile body, one end port, far away from the main reinforcements, 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 is more than or equal to three times of the diameter of the main reinforcements, the length of the inner space of the connecting pipe is more than or equal to three times of the diameter of the main reinforcements, and all or part of the connecting pipes are internally provided with clamping pieces for clamping the main reinforcements.

2. The high shear prestressed concrete pile of claim 1, wherein: the length of the main rib extension part is less than or equal to the length of the inner space of the connecting pipe.

3. A high shear prestressed concrete pile according to claim 1 or 2, characterized in that: the clamping piece comprises a clamping piece main body fixed in the connecting pipe through threads and more than two elastic clamping pieces arranged on the clamping piece main body, and the upset head of the main rib can radially expand the more than two elastic clamping pieces, penetrate the space between the more than two elastic clamping pieces and realize clamping through resilience of the elastic clamping pieces.

4. The high shear prestressed concrete pile of claim 3, wherein: the inner hole of the connecting pipe is a step hole provided with threads, a step surface facing away from the port of the connecting pipe is formed, and the connecting pipe is used for positioning a clamping piece in threaded fit with the large-diameter part of the step hole.

5. A high shear prestressed concrete pile according to claim 1 or 2, characterized in that: 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.

6. The high shear prestressed concrete pile of claim 5, wherein: the connecting part is a connecting nut fixed on the inner side of the connecting pipe main body through threads.

7. The high shear prestressed concrete pile of claim 6, wherein: the end face of one end, facing the inner side of the connecting pipe main body, of the connecting nut is a concave conical surface, and the inner side of the other end of the connecting nut is of a hexagonal hole structure.

8. The high shear prestressed concrete pile of claim 7, wherein: the vertex angle of the conical surface is 120 degrees, and the axial length of the connecting nut is more than 10 mm.

9. The high shear prestressed concrete pile of claim 8, wherein: the inner sides of the two ends of the connecting pipe main body are both provided with threads.