Sleeve, sleeve end plate and concrete precast pile

Abstract

The utility model discloses a sleeve, a sleeve end plate and a concrete precast pile, and belongs to the technical field of building materials, the sleeve comprises an end plate and a plurality of sleeves, the plurality of sleeves are arranged on the same side of the end plate, and a plurality of end plate threaded holes are distributed at the outer side edge of the end plate; the end plate comprises a plurality of end plate threaded holes; the sleeve comprises a sleeve external thread, and the sleeve external thread is arranged at the bottom of the outer cylindrical face of the sleeve and corresponds to the thread of the end plate threaded hole. According to the utility model, the shape of the end plate is changed to correspond to concrete piles with different specifications. And the sleeve and the end plate are reliably connected through a mechanical structure, so that the problem of structural strength caused by nonstandard welding operation is avoided, and the workload is reduced. And meanwhile, the stress point is on the sleeve instead of the end plate, so that the end plate with thinner thickness can be adopted, the cost is saved, and the quality of the finally manufactured concrete precast pile is also ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of building materials, and in particular to a sleeve, a sleeve end plate and a precast concrete pile. Background Art

[0002] Precast concrete piles, due to their advantages of saving wood and steel, durability, and low cost, have been widely used in hydraulic structures, industrial buildings, civil engineering, and bridges. They are also commonly used for anti-slip and water-blocking purposes in slope and foundation pit support. Precast concrete piles come in various cross-sections, including square, rectangular, circular, and ring-shaped. Square and ring-shaped piles are the most commonly used.

[0003] End plates are required at the pile heads at both ends of precast concrete piles. The functions of the end plates include the following: first, to provide end support. The end plates of precast concrete piles provide solid support at the ends of the precast piles to prevent deformation or damage during the precast process. Second, they serve as positioning points for prestressing and are fixed to the sleeves that connect prestressed tendons such as steel bars. After the precast piles are precast, the prestressed tendons in the end plates can be prestressed to the precast piles through tensioning, improving their bearing capacity and seismic resistance. During the precast concrete pile precast process, the selection and use of end plates have a significant impact on the quality and performance of the precast piles. Therefore, in actual applications, the appropriate end plate type and structure should be selected according to project needs, and the precast process should be strictly carried out in accordance with relevant specifications and requirements to ensure the quality and safety of the precast piles.

[0004] Currently, welding is the most common method for connecting end plates and sleeves. However, due to construction environment limitations, this process is prone to quality issues. The varying skills of on-site pile foundation construction units and personnel can lead to significant variations in the quality of the welds between pile heads. This quality directly impacts the performance of the pullout piles and poses a safety hazard to the project. Furthermore, welding requires a long time, hindering project progress and increasing the workload for construction personnel. Therefore, it is necessary to design an improved sleeve end plate using a mechanical connection to address these issues. Utility Model Content

[0005] The utility model aims to provide a sleeve, a sleeve end plate and a precast concrete pile using the sleeve or with the sleeve end plate, which is convenient for operators to assemble and centrifugally cast the concrete pile at a construction site.

[0006] In order to achieve the above-mentioned purpose, the technical solution of this utility model is:

[0007] A sleeve comprises an external sleeve thread, which is arranged at the bottom of the outer cylindrical surface of the sleeve; an internal sleeve thread, which is arranged at the bottom of the inner cylindrical surface of the sleeve; and a countersunk hole, which is opened on the top surface of the sleeve.

[0008] In a preferred embodiment of the present invention, the sleeve further comprises a side wall opening, and the side wall opening is provided on a side of the sleeve.

[0009] In a preferred embodiment of the present invention, the external thread of the sleeve and the internal thread of the sleeve are in opposite directions.

[0010] In a preferred embodiment of the present invention, a longitudinal through hole is provided in the middle of the sleeve; the sleeve further includes a sleeve limiting ring, which is placed inside the longitudinal through hole of the sleeve and is inserted from one end of the sleeve with the sleeve external thread and the sleeve internal thread.

[0011] The utility model also relates to a sleeve end plate, comprising an end plate and a plurality of the above-mentioned sleeves, wherein the plurality of sleeves are arranged on the same side of the end plate; the end plate comprises a plurality of end plate threaded holes, wherein the plurality of end plate threaded holes are distributed at the outer edge of the end plate, and the threads of the end plate threaded holes correspond to the sleeve external threads of the sleeve.

[0012] In a preferred embodiment of the present invention, a limiting protrusion is provided in the threaded hole of the end plate on a side away from the installation direction of the sleeve to limit the screw-in depth of the sleeve.

[0013] In a preferred embodiment of the present invention, the thickness of the external thread of the sleeve is less than or equal to the thickness of the end plate.

[0014] In the above-mentioned sleeve end plate, a through hole is provided in the center of the end plate.

[0015] In the above-mentioned sleeve end plate, the shape of the end plate corresponds to the shape of the end of the concrete precast pile to be manufactured, and adopts a circular, annular, polygonal, or irregular shape.

[0016] The utility model also relates to a precast concrete pile, which adopts the above-mentioned sleeve, and a plurality of the sleeves are arranged at both ends of the precast concrete pile.

[0017] In the above-mentioned precast concrete pile, the end of the sleeve with the countersunk hole is arranged toward the precast concrete pile.

[0018] The utility model also relates to another precast concrete pile, which adopts the above-mentioned sleeve end plates, and the sleeve end plates are arranged at both ends of the precast concrete pile.

[0019] In the above-mentioned precast concrete pile with sleeve end plate, the convex end of the sleeve in the sleeve end plate is arranged toward the precast concrete pile.

[0020] Beneficial effect: The sleeve end plate of the present invention adopts a combination of sleeve and end plate. By changing the shape of the end plate, it can correspond to concrete piles of different specifications. Processing the sleeve and end plate separately also simplifies the production process and reduces production costs. The sleeve and end plate do not need to be connected by welding, and can be reliably connected through a mechanical structure, avoiding the structural strength problems caused by irregular welding operations and reducing workload. At the same time, due to the stable structure, the force point is on the sleeve rather than the end plate. Therefore, compared with existing products, a thinner end plate can be used, which saves costs while ensuring the quality of the final precast concrete piles.

[0021] In order to make the above features and advantages of the utility model more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the sleeve end plate of the present invention.

[0023] Figure 2 It is a three-dimensional schematic diagram of the end plate in the sleeve end plate of the present invention.

[0024] Figure 3 It is a three-dimensional schematic diagram of the sleeve in the sleeve end plate of the present invention.

[0025] Figure 4 This is a schematic diagram of the disassembly of the sleeve in the sleeve end plate of the present invention.

[0026] Figure 5 This is a schematic diagram of the sleeve end plate of the present invention in use. DETAILED DESCRIPTION

[0027] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, back, bottom, top, etc., are only reference to the directions of the attached drawings. Therefore, the directional terms used are for illustration, not for limitation of the present invention.

[0028] Figure 1 FIG is a three-dimensional schematic diagram of the sleeve end plate of the present invention. Figure 1 As shown, the sleeve end plate 100 includes an end plate 110 and a plurality of sleeves 120 . The plurality of sleeves 120 are disposed on the same side of the end plate 110 .

[0029] Figure 2 This is a three-dimensional schematic diagram of the end plate in the sleeve end plate of the present invention. Figure 2 As shown, the end plate 110 includes a plurality of end plate threaded holes 111, which are evenly arranged in a circular shape on the edge of the end plate 110. The number of the end plate threaded holes 111 corresponds to the number of the sleeves 120. The shape of the end plate 110 is determined by the shape of the end of the concrete precast pile to be manufactured. Corresponding to the shape of the end of the concrete precast pile, the end plate 110 can adopt any shape, such as polygonal, circular, annular, or similar. Figure 2 The irregular shapes include regular octagons with two concave sides. Preferably, a through hole 112 is provided in the center of the end plate 110 for corresponding to the center hole of the precast concrete pile.

[0030] Figure 3 This is a three-dimensional schematic diagram of the sleeve in the sleeve end plate of the utility model. Figure 4 This is a schematic diagram of the sleeve disassembly in the sleeve end plate of the present invention. Figure 3 and Figure 4 As shown, the sleeve 120 is preferably a straight-through sleeve, which is a cylindrical hollow cylindrical structure with parallel inner and outer cylindrical surfaces and a longitudinal through hole in the middle. The sleeve 120 includes a sleeve external thread 121, a sleeve internal thread 122, a limiting ring 123, and a countersunk hole 124. The sleeve external thread 121 is arranged at the bottom of the outer cylindrical surface of the sleeve 120, and the sleeve internal thread 122 is arranged at the bottom of the inner cylindrical surface of the sleeve 120, and the sleeve external thread 121 and the sleeve internal thread 122 are in opposite directions; the limiting ring 123 is placed inside the longitudinal through hole of the sleeve 120 and is inserted through the end of the sleeve 120 with the sleeve external thread 121 and the sleeve internal thread 122; the countersunk hole 124 is opened on the top surface of the sleeve 120, that is, away from the top surface of the sleeve external thread 121 and the sleeve internal thread 122.

[0031] The sleeve external thread 121 corresponds to the thread of the end plate threaded hole 111. By matching the sleeve external thread 121 with the end plate threaded hole 111, multiple sleeves 120 are respectively installed in the multiple end plate threaded holes 111 on the same side of the end plate 110. When the sleeve 120 is installed on the end plate 110, the end of the sleeve 120 with the countersunk hole 124 protrudes from the end plate 110, and the end of the sleeve 120 with the sleeve external thread 121 and the sleeve internal thread 122 does not protrude from the end plate threaded hole 111.

[0032] To ensure that the end of the sleeve 120 with the sleeve external thread 121 does not protrude from the end plate threaded hole 111 after installation, the thickness of the sleeve external thread 121 can be set to be less than or equal to the thickness of the end plate 110. A limiting protrusion can also be provided in the end plate threaded hole 111 on the side away from the installation direction of the sleeve 120 to limit the screw-in depth of the sleeve 120 and prevent the end of the sleeve 120 with the sleeve external thread 121 from protruding from the end surface of the end plate 110 when tightening. Figure 5 Schematic diagram of the sleeve end plate in use of the present invention. Figure 5 As shown, the sleeve end plates 100 are provided at both ends of the precast concrete pile 200. The end of the sleeve end plate 100 with the countersunk hole 124 is provided toward the precast concrete pile 200.

[0033] In actual operation, the specific production process of precast concrete piles is as follows:

[0034] Step S1 : Determine the specific specifications and dimensions of the precast concrete pile 200 and select steel bars of corresponding specifications and quantity.

[0035] In step S2, the two sleeves 120 with the countersunk holes 124 facing inward are respectively sleeved on both ends of the steel bars, and steel bar piers are made at the heads of each steel bar, so that the size of the countersunk holes 124 is smaller than the size of the steel bar piers to ensure that the sleeves 120 will not separate from the steel bars.

[0036] In step S3 , each sleeve 120 is installed on the end plates 110 on both sides through the end plate threaded holes 111 , forming a configuration in which several steel bars are connected between the sleeve end plates 100 .

[0037] Step S4, install a tensioning screw on one side of the steel bar pier head, and lock the tensioning screw with the sleeve internal thread 122 of each sleeve 120. The limiting ring 123 is used to limit the tensioning screw. The purpose of the opposite directions of the sleeve external thread 121 and the sleeve internal thread 122 is to ensure that when tightening the tensioning screw, the thread fit between the sleeve 120 and the end plate 110 will not be loosened.

[0038] In step S5, the assembly of the installed steel bars and the sleeve end plates 100 is placed in a centrifugal machine for making precast concrete piles, the sleeve end plates 100 on both sides are tightened, concrete is poured between the two sleeve end plates 100, and a centrifugal process is performed to produce precast concrete piles 200 of corresponding shapes.

[0039] The finished precast concrete piles are prestressed concrete components that meet the needs of the project.

[0040] In addition to being a straight-through sleeve, the sleeve 120 can also be a sidewall opening sleeve. The difference between the straight-through sleeve and the sleeve 120 is that the sidewall opening is provided on the side of the sleeve 120. When fixing the rebar, the rebar can be inserted through the sidewall opening and exit from the countersunk hole. After the rebar head is formed at the exiting portion, the rebar head cannot be inserted back into the countersunk hole, thereby achieving the fixation of the rebar.

[0041] The sleeve 120 involved in the present invention can also be used for precast concrete piles when it is not suitable for the end plate 110. Conventional sleeve piles without end plates have insufficient bonding strength with concrete due to the smooth outer surface of the sleeve. Insufficient bonding strength when subjected to force can easily lead to damage to the pile head, thereby damaging the concrete pile. However, the sleeve 120 of the present invention has the sleeve external thread 121 provided on the outer side. When no end plate is used, the sleeve external thread 121 is in direct contact with the concrete, and its surface shape can enhance its bonding strength with the concrete. In the case of not using an end plate, similar production steps as described above can also be adopted. The sleeve 120 is arranged at both ends of the precast concrete pile, and a number of steel bars are connected between the corresponding multiple groups of sleeves 120 on both sides. The end of the sleeve 120 with the countersunk hole 124 is arranged toward the precast concrete pile. In summary, the sleeve end plate of the present invention adopts a combination of a sleeve and an end plate. By changing the shape of the end plate, it can correspond to concrete piles of different specifications. Processing the sleeve and the end plate separately also simplifies the production process and reduces production costs. The sleeve and the end plate do not need to be connected by welding, and can be reliably connected through a mechanical structure, avoiding the structural strength problems caused by irregular welding operations and reducing the workload. At the same time, due to the stable structure, the force point is on the sleeve rather than the end plate. Therefore, compared with existing products, a thinner end plate can be used, which saves costs while ensuring the quality of the final precast concrete piles.

[0042] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Anyone with ordinary skill in the art may make slight modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent applications.

Claims

1. A sleeve, characterized in that: include, An external sleeve thread, the external sleeve thread being arranged at the bottom of the outer cylindrical surface of the sleeve; An internal thread of the sleeve, wherein the internal thread of the sleeve is provided at the bottom of the inner cylindrical surface of the sleeve; and A countersunk hole is provided on the top surface of the sleeve.

2. The sleeve according to claim 1, characterized in that The sleeve further comprises a side wall opening, and the side wall opening is opened on the side of the sleeve.

3. The sleeve according to claim 1, wherein: The external thread of the sleeve is in opposite directions to the internal thread of the sleeve.

4. The sleeve according to claim 1, wherein: A longitudinal through hole is provided in the middle of the sleeve; the sleeve also includes a sleeve limiting ring, which is placed inside the longitudinal through hole of the sleeve and is inserted from one end of the sleeve with the sleeve external thread and the sleeve internal thread.

5. A sleeve end plate, characterized in that: comprising an end plate, and a plurality of sleeves according to any one of claims 1 to 4, wherein the plurality of sleeves are arranged on the same side of the end plate; The end plate includes a plurality of end plate threaded holes, and the plurality of end plate threaded holes are distributed at the outer edge of the end plate. The threads of the end plate threaded holes correspond to the sleeve external threads of the sleeve.

6. The sleeve end plate according to claim 5, characterized in that: A limiting protrusion is provided in the threaded hole of the end plate on a side away from the installation direction of the sleeve to limit the screw-in depth of the sleeve.

7. The sleeve end plate according to claim 5, characterized in that: The thickness of the external thread of the sleeve is less than or equal to the thickness of the end plate.

8. The sleeve end plate according to claim 5, characterized in that: A through hole is provided at the center of the end plate.

9. The sleeve end plate according to claim 5, characterized in that: The shape of the end plate corresponds to the shape of the end head of the concrete precast pile to be manufactured, and can be circular, annular, polygonal, or any shape corresponding to the shape of the end head of the concrete precast pile to be manufactured.

10. Precast concrete piles, characterized in that: The sleeve according to any one of claims 1 to 4 is used, and a plurality of the sleeves are arranged at both ends of the precast concrete pile.

11. The precast concrete pile according to claim 10, characterized in that: The end of the sleeve with the countersunk hole is arranged toward the precast concrete pile.

12. Precast concrete piles, characterized in that: The sleeve end plate according to any one of claims 5 to 8 is used, and the sleeve end plate is arranged at both ends of the precast concrete pile.

13. The precast concrete pile according to claim 12, characterized in that: The protruding end of the sleeve in the sleeve end plate is arranged toward the precast concrete pile.

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