End plate suitable for prestressed concrete precast pile

Abstract

The end plate comprises an end plate body and a plurality of through holes vertically formed in the end plate body, the end plate body comprises a first end face and a second end face, and the first end face abuts against a pile head of the prestressed concrete precast pile; the through hole comprises a large hole and a small hole which are communicated with each other, and the small hole is formed in the first end face and used for anchoring a pier head of a prestressed main reinforcement; the large hole is formed in the second end face, and internal threads are annularly arranged on the inner wall of the large hole and used for being connected with a tensioning bolt. A common end plate is optimized, the thickness of the common end plate is increased, the circular or square annular end plate is formed, the tensioning holes and the anchoring holes share one vertical through hole, the problems of anchoring of prestressed main ribs and connection of tensioning bolts are solved, the number of the through holes is reduced, the influence of large and small gourd-shaped holes on the strength of the end plate is avoided, and the service life of the end plate is prolonged. The stability and reliability of the whole structure are improved, and the production process is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed concrete precast piles, and in particular to an end plate suitable for prestressed concrete precast piles. Background Art

[0002] At present, the pile head end plates of prestressed concrete precast piles are all sheet-shaped end plates with a thickness of about 20mm. Large and small holes are opened on the end plates corresponding to the positions of the prestressed main reinforcement of the pile body. The large hole is a tensioning hole, which is used to insert the pier head of the prestressed main reinforcement and embed the prestressed main reinforcement into the small hole and connect the tensioning anchor bolt. The small hole is a swaged hole, which is used to anchor the pier head of the prestressed main reinforcement. The large and small holes are connected to form a gourd shape.

[0003] Due to the limited thickness of the end plate and the small out-of-plane stiffness, the end plate is prone to out-of-plane bending deformation or concave deformation during production tensioning and when the pull-out pile body is subjected to large tension, and the amount of steel used is also large, especially for the square pile end plate, which is costly. In addition, due to the limited thickness of the end plate, a too deep swage hole will cause the bottom plate of the hole to be too thin, and the swage of the prestressed main reinforcement will be pulled off; a too shallow swage hole will cause the swage of the prestressed main reinforcement to protrude from the end face. Moreover, when welding the piles, the weld width is limited when welding at the edge of the thinner outer ring of the end plate, which affects the strength of the weld connection. Summary of the invention

[0004] The object of the present invention is to provide an end plate suitable for prestressed concrete precast piles, which can solve one or more of the above-mentioned problems in the prior art.

[0005] An end plate suitable for prestressed concrete precast piles comprises: an end plate body and a plurality of through holes vertically opened in the end plate body,

[0006] The end plate body comprises a first end surface and a second end surface, wherein the first end surface abuts against the pile head of the prestressed concrete precast pile;

[0007] The through hole includes a large hole and a small hole that are interconnected. The small hole is opened on the first end face and is used to anchor the pier head of the prestressed main reinforcement; the large hole is opened on the second end face, and the inner wall of the large hole is ring-shaped with an internal thread for connecting tensioning bolts.

[0008] In some embodiments, the through hole has a ladder-like structure, and a step surface is formed between the large hole and the small hole, and the step surface is used to anchor the pier head of the prestressed main reinforcement.

[0009] In some embodiments, an opening is formed between the through hole and the peripheral wall of the end plate body to facilitate the transverse insertion of the prestressed main reinforcement into the through hole.

[0010] In some embodiments, the end plate body is an annular structure.

[0011] In some embodiments, the end plate body is square.

[0012] In some embodiments, the through hole is vertically penetrated through the end plate body; the opening is laterally formed with the through hole and the outer wall of the end plate body, and the spacing between the openings is equal to the inner diameter of the small hole.

[0013] In some embodiments, the end plate body is circular.

[0014] In some embodiments, the through hole is vertically penetrated through the end plate body; the opening is radially formed between the through hole and the inner wall of the end plate body, and the spacing between the openings is equal to the inner diameter of the small hole.

[0015] In some embodiments, the thickness of the end plate body is 40-50 mm.

[0016] The beneficial effects of the present invention are as follows: the present invention optimizes the common prestressed pile end plate, increases its thickness, reduces its width, forms a circular or square annular end plate, and the tensioning hole and the anchor hole share a vertical through hole, which has the following advantages:

[0017] 1. The annular end plate uses slightly less steel than the ordinary end plate, and the overall rigidity is increased, avoiding the out-of-plane bending deformation caused by the limited thickness of the ordinary end plate.

[0018] 2. The tensioning holes and anchor holes share a vertical through hole, which avoids the influence of the large and small gourd holes on the ordinary end plate on the strength of the end plate and is easy to produce.

[0019] 3. The thickness of the end plate increases, and the use of welding piles can increase the weld width and improve the welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 , 2 It is a structural block diagram of an end plate suitable for prestressed concrete precast piles according to one embodiment of the present invention;

[0021] Figure 3 yes Figure 1 a bottom view of the end plate shown;

[0022] Figure 4 yes Figure 1 a cross-sectional view of the end plate shown;

[0023] Figure 5 , 6 It is a structural schematic diagram of an end plate suitable for prestressed concrete precast piles in another embodiment of the present invention;

[0024] Figure 7 yes Figure 5a bottom view of the end plate shown;

[0025] Numbers in the figure: 1, end plate body; 11, first end face; 12, second end face; 2, through hole; 21, large hole; 22, small hole; 23, stepped surface; 3, opening. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] Combination Figure 1-4 As shown, this embodiment provides an end plate suitable for prestressed concrete precast piles, including an end plate body 1 and a plurality of through holes 2 vertically penetrating the end plate body 1, the end plate body 1 including a first end face 11 and a second end face 12, the first end face 11 abuts against the pile head of the prestressed concrete precast pile. The through hole 2 is a ladder-shaped structure, including a large hole 21 and a small hole 22 that are interconnected, the inner diameter of the large hole 21 is larger than the inner diameter of the small hole 22, thereby, a ladder surface 23 is formed at the junction of the large hole 21 and the small hole 22, which is used to anchor the pier head of the prestressed main reinforcement. It should be noted here that the prestressed concrete precast column includes a pile body and a steel cage located in the pile body, the steel cage includes axially arranged prestressed main reinforcement and stirrups wound outside the prestressed main reinforcement, and pier heads are formed at both ends of the prestressed main reinforcement. During the production and processing, the prestressed main reinforcement is tensioned by tensioning the pier heads.

[0028] Specifically, the small hole 22 is opened at the first end face 11, and the large hole 21 is opened at the second end face 12. The large hole 21 and the small hole 22 are vertical through holes that are interconnected. The inner wall of the large hole 21 is provided with an internal thread for connecting the tensioning bolts. During operation, the pier head of the prestressed main reinforcement is passed through the large hole 21 and then turned into the step surface 23 to complete the anchoring of the prestressed main reinforcement. The operation is simple and convenient. It should be noted here that the opening position and inner diameter size of the through hole 2 correspond to the prestressed main reinforcement, which is used to realize the anchoring of the prestressed main reinforcement and the connection of the tensioning bolts. Specifically, the outer diameter of the pier head of the prestressed main reinforcement should be smaller than the inner diameter of the large hole 21 and larger than the inner diameter of the small hole 22, so that the pier head of the prestressed main reinforcement can be anchored at the step surface 23 between the large hole 21 and the small hole 22. Compared with the gourd-shaped large holes and small holes in the prior art, the large holes and small holes of the present invention share a vertical through hole, which not only solves the problems of anchoring the prestressed main reinforcement and connecting the tension bolts, but also reduces the number of through holes, reduces the processing difficulty and cost, and improves the space utilization rate of the end plate. In addition, the design of the large hole 21 and the small hole 22 of the present invention sharing a vertical through hole can also avoid the weakening of the end plate strength by the large and small gourd holes, improve the stability and reliability of the overall structure, and optimize the production process.

[0029] Furthermore, in order to facilitate the operation of the operators, an opening 3 is formed between the through hole 2 and the peripheral wall of the end plate body 1 in this embodiment. During production and processing, the operator inserts the end of the prestressed main reinforcement horizontally into the through hole 2 through the opening 3, and then pulls the end plate body 1 outward, so that the pier head of the prestressed main reinforcement can pass through the large hole 21 and anchor at the step surface 23 between the large hole 21 and the small hole 22, which is simple and convenient to operate. It should be noted here that the opening 3 is vertically penetrated between the through hole 2 and the peripheral wall of the end plate body 1, so that the prestressed main reinforcement can be inserted horizontally into the through hole 2.

[0030] Furthermore, the end plate body 1 of the present embodiment is annular, and the thickness of the end plate body 1 is 40 to 50 mm. Compared with the ordinary end plate in the prior art, the end plate of the present invention can distribute stress more evenly when subjected to force, thereby improving the overall stability and durability of the structure, ensuring sufficient strength and rigidity, and facilitating production and processing, thereby avoiding the out-of-plane bending deformation caused by the limited thickness of the ordinary end plate, and using slightly less steel than the ordinary end plate. It should be noted here that the shape of the end plate body 1 of the present invention matches the cross-section of the prestressed concrete precast pile. When the cross-section of the prestressed concrete precast pile is square, the end plate body 1 is a square annular structure; when the cross-section of the prestressed concrete precast pile is circular, the end plate body 1 is a circular annular structure.

[0031] Combination Figure 1 , 2As shown, in the first embodiment of the end plate of the present invention, the end plate body 1 is a square annular structure, including an inner peripheral wall and an outer peripheral wall. Through holes 2 are vertically opened at equal intervals in the end plate body 1, and openings 3 are horizontally opened between the through holes 2 and the outer peripheral wall of the end plate body 1, and the spacing of the openings 3 is equal to the inner diameter of the small hole 22. During production and processing, the end of the prestressed main reinforcement is horizontally inserted into the through hole 2 of the end plate body through the opening 3, and then the end plate body 1 is pulled outward, and the pier head of the prestressed main reinforcement can be anchored at the small hole 22 through the large hole 21, and then the large hole 21 is connected with the tensioning bolt, so that the tensioning operation of the prestressed main reinforcement can be realized.

[0032] Combination Figure 5-7 As shown, in the second embodiment of the end plate of the present invention, the end plate body 1 is a circular ring structure, including an inner peripheral wall and an outer peripheral wall. Through holes 2 are vertically arranged in the end plate body 1 at equal intervals, and openings 3 are radially formed between the through holes 2 and the inner peripheral wall of the end plate body 1.

[0033] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An end plate suitable for prestressed concrete precast piles, characterized in that: include: An end plate body (1) and a plurality of through holes (2) vertically opened in the end plate body (1), The end plate body (1) comprises a first end surface (11) and a second end surface (12), wherein the first end surface (11) abuts against the pile head of the prestressed concrete precast pile; The through hole (2) comprises a large hole (21) and a small hole (22) which are interconnected. The small hole (22) is provided on the first end surface (11) and is used for anchoring the pier head of the prestressed main reinforcement. The large hole (21) is provided on the second end surface (12). The inner wall of the large hole (21) is provided with an internal thread for connecting a tensioning bolt.

2. The end plate according to claim 1, characterized in that: The through hole (2) has a ladder-like structure, and a ladder surface (23) is formed between the large hole (21) and the small hole (22), and the ladder surface (23) is used to anchor the pier head of the prestressed main reinforcement.

3. The end plate according to claim 1, characterized in that: An opening (3) is formed between the through hole (2) and the peripheral wall of the end plate body (1) to facilitate the transverse insertion of the prestressed main reinforcement into the through hole (2).

4. The end plate according to claim 3, characterized in that: The end plate body (1) is an annular structure.

5. The end plate according to claim 4, characterized in that: The end plate body (1) is square.

6. The end plate according to claim 5, characterized in that: The through hole (2) is vertically penetrated through the end plate body (1); the opening (3) is formed transversely between the through hole (2) and the outer wall of the end plate body (1), and the spacing between the openings (3) is equal to the inner diameter of the small hole (22).

7. The end plate according to claim 4, characterized in that: The end plate body (1) is circular.

8. The end plate according to claim 7, characterized in that: The through hole (2) is vertically penetrated through the end plate body (1); the opening (3) is radially formed on the inner wall of the through hole (2) and the end plate body (1), and the spacing between the openings (3) is equal to the inner diameter of the small hole (22).

9. The end plate according to claim 1, characterized in that: The thickness of the end plate body (1) is 40-50 mm.

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