Sleeve for precast pile and mechanical connecting device

Abstract

The invention relates to a sleeve for a precast pile. The sleeve comprises a threaded sleeving part and an elastic sleeving part, a first external thread is arranged on the outer wall of the threaded sleeving part; the outer diameter of the elastic sleeving part is sequentially increased from top to bottom, a plurality of long grooves are formed in the elastic sleeving part in an annular array mode, and the long grooves extend from the top of the elastic sleeving part to the bottom of the elastic sleeving part. A plurality of annular first tooth-shaped structures are arranged on the inner wall of the elastic sleeving part. The invention further relates to a mechanical connecting device which comprises an upper reinforcing steel bar, an upper joint nut, a sleeve, an inserting rod, a lower joint nut and a lower reinforcing steel bar. A traditional sleeve and a traditional middle nut are combined into a whole, the number of parts is reduced, and the installation difficulty is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of precast piles, and in particular to a sleeve and a mechanical connection device for precast piles. Background Art

[0002] Pile foundation is a foundation form with high bearing capacity, wide application range and excellent comprehensive performance. Among them, precast piles are widely recognized and widely used in the engineering field due to their short construction time and high reliability. In recent years, precast piles have not only continued to be used as an important independent pile type in engineering, but also been widely used as core piles of composite piles. Precast piles require connection devices during construction.

[0003] The Chinese invention patent with announcement number CN219653700U discloses a ferrule for prefabricated piles, on which a number of long grooves are arranged in a circular array, extending from the top of the ferrule to the bottom of the ferrule, and the long grooves penetrate the inner and outer walls of the ferrule; the ferrule is divided into a propulsion zone and a matching zone from bottom to top, and the propulsion zone and the matching zone share the same axis; the outer diameter of the propulsion zone is equal from bottom to top, and the inner diameter of the propulsion zone is also equal from bottom to top; the outer diameter of the matching zone gradually decreases from bottom to top, and the inner diameter of the matching zone gradually decreases from bottom to top; the bottom edge of the propulsion zone extends outward to form a circle of support ring. By improving the ferrule structure, the elasticity of the ferrule is effectively improved, the number of parts is reduced, the difficulty of installation is reduced, and the installation efficiency is improved. The present invention also relates to a connection module and a connection device. However, the parts in the above-mentioned connection module include upper threaded steel, upper joint nut, plug rod, middle nut, ferrule, spring, lower joint nut and lower threaded steel, and the parts are still relatively large, which is still difficult to install, and the part where the ferrule and the plug rod are inserted is extremely smooth and easy to fall off.

[0004] It is desired to provide a sleeve and a mechanical connection device for prefabricated piles, which can solve the above technical problems. Summary of the invention

[0005] The first object of the present invention is to provide a sleeve for a prefabricated pile, comprising a threaded sleeve portion and an elastic sleeve portion; The elastic sleeve portion is located on the top of the threaded sleeve portion, and the threaded sleeve portion and the elastic sleeve portion are an integrally formed structure; The outer wall of the threaded sleeve portion is provided with a first external thread; The outer diameter of the elastic sleeve portion increases from top to bottom, and the elastic sleeve portion is provided with a plurality of long grooves in a circular array, the long grooves extending from the top of the elastic sleeve portion to the bottom of the elastic sleeve portion, and the long grooves penetrate the inner and outer walls of the elastic sleeve portion; A plurality of first annular tooth structures are arranged on the inner wall of the elastic sleeve portion.

[0006] A second object of the present invention is to provide a mechanical connection device, comprising an upper steel bar, an upper joint nut, a sleeve, a plunger, a lower joint nut and a lower steel bar; A first clamping portion is provided at the bottom of the upper steel bar, and the upper steel bar is clamped to the upper part of the upper joint nut through the first clamping portion, and the upper steel bar passes through the top of the upper joint nut; A first internal thread is provided on the inner wall of the lower part of the upper joint nut, the first internal thread is matched with the first external thread, the sleeve is the above-mentioned sleeve, and the sleeve is connected in the upper joint nut through the matching thread of the first external thread and the first internal thread; The bottom of the insertion rod has a connecting portion, and the connecting portion is provided with a second external thread; The upper inner wall of the lower joint nut is provided with a second internal thread, and the second internal thread is adapted to the second external thread; The connecting portion is threadedly connected in the lower joint nut, and the insertion rod is sleeved on the sleeve and passes through the top of the sleeve; The top of the lower steel bar is provided with a second clamping portion, the lower steel bar is clamped to the lower part of the lower joint nut through the second clamping portion, and the lower steel bar passes through the bottom of the lower joint nut.

[0007] Preferably, a plurality of annular second tooth structures are provided on the upper outer wall of the insertion rod, and the second tooth structures are adapted to the first tooth structures; The plurality of second tooth structures on the insertion rod are meshed with the plurality of annular first tooth structures on the inner wall of the elastic sleeve portion.

[0008] Furthermore, the top of the insertion rod has an introduction portion.

[0009] Preferably, the top of the upper joint nut and the bottom of the lower joint nut both have regular polygonal anti-slip structures.

[0010] The sleeve and mechanical connection device for prefabricated piles of the present invention have the following advantages compared with the prior art: (1) The traditional sleeve and the middle nut are combined into one, which reduces the number of parts and the difficulty of installation. In addition, a plurality of annular second tooth structures are provided on the upper outer wall of the plug rod, and the plurality of second tooth structures on the plug rod are meshed with the plurality of annular first tooth structures on the inner wall of the elastic sleeve portion, which can improve the connection strength between the plug rod and the sleeve; (2) Simple structure and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a sleeve for prefabricated piles provided in Example 1 Figure 1 ; Figure 2 A schematic diagram of a sleeve for prefabricated piles provided in Example 1 Figure 2 ; Figure 3 An exploded view of a mechanical connection device provided in Example 2; Figure 4 A schematic diagram of the structure of the upper reinforcement and the lower reinforcement provided in Example 2; Figure 5 A schematic diagram of the structure of the upper joint nut provided in Example 2; Figure 6 A schematic diagram of the structure of the plug rod provided in Example 2; Figure 7 A cross-sectional view of a mechanical connection device provided in Example 2; Figure 8 This is a schematic structural diagram of a mechanical connection device provided in Example 2. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] Example 1 like Figure 1 As shown, a sleeve for prefabricated piles comprises a threaded sleeve portion 1 and an elastic sleeve portion 2; the elastic sleeve portion 2 is located at the top of the threaded sleeve portion 1, and the threaded sleeve portion 1 and the elastic sleeve portion 2 are an integrally formed structure.

[0014] The outer wall of the threaded sleeve portion 1 is provided with a first external thread 3 , and the sleeve is connected to the external upper joint nut through the first external thread 3 on the outer wall of the threaded sleeve portion 1 .

[0015] The outer diameter of the elastic sleeve part 2 increases from top to bottom, and a plurality of long grooves 4 are provided on the elastic sleeve part 2 in a circular array, and the long grooves 4 extend from the top of the elastic sleeve part 2 to the bottom of the elastic sleeve part 2, and the long grooves penetrate the inner and outer walls of the elastic sleeve part 2, ensuring that the elastic sleeve part 2 has sufficient elasticity when the external plug rod is inserted.

[0016] like Figure 2 As shown, a plurality of annular first tooth structures 5 are provided on the inner wall of the elastic sleeve portion 2, which can increase the strength of the connection with the insertion rod and prevent it from falling off.

[0017] Example 2 like Figure 3 As shown, a mechanical connection device includes an upper steel bar 6, an upper joint nut 7, a sleeve 8, an insertion rod 9, a lower joint nut 10 and a lower steel bar 11.

[0018] like Figure 4 As shown, a first clamping portion 12 is provided at the bottom of the upper steel bar 6 , and the upper steel bar 6 is clamped to the upper part of the upper joint nut 7 through the first clamping portion 12 , and the upper steel bar 6 passes through the top of the upper joint nut 7 .

[0019] like Figure 5 As shown, a first internal thread 13 is provided on the lower inner wall of the upper joint nut 7, and the first internal thread 13 is adapted to the first external thread 3. The sleeve 8 is the sleeve provided in Example 1, and the sleeve 8 is connected to the upper joint nut 7 through the matching threads of the first external thread 3 and the first internal thread 13.

[0020] like Figure 6 As shown, the bottom of the insertion rod 9 has a connecting portion, and the connecting portion is provided with a second external thread 14; the upper inner wall of the lower joint nut 10 is provided with a second internal thread 17, and the second internal thread 17 is adapted to the second external thread 14; the connecting portion is threadedly connected to the lower joint nut 10, and the insertion rod 9 is sleeved on the sleeve 8 and passes through the top of the sleeve 8.

[0021] In this embodiment, if Figure 6 As shown, a plurality of annular second tooth structures 15 are provided on the upper outer wall of the insertion rod 9, and the second tooth structures 15 are adapted to the first tooth structures 5; the plurality of second tooth structures 15 on the insertion rod 9 are meshed with the plurality of annular first tooth structures 5 on the inner wall of the elastic sleeve 2; such an arrangement can improve the connection strength between the insertion rod 9 and the sleeve 8.

[0022] Furthermore, in this embodiment, the top of the insertion rod 9 has an introduction portion 16, which facilitates the insertion of the insertion rod 9 into the sleeve 8 during installation, thereby improving installation efficiency.

[0023] like Figure 5 As shown, the top of the lower steel bar 11 has a second clamping portion 18, the lower steel bar 11 is clamped to the lower part of the lower joint nut 10 through the second clamping portion 18, and the lower steel bar 11 passes through the bottom of the lower joint nut 10.

[0024] In this embodiment, the top of the upper joint nut 7 and the bottom of the lower joint nut 10 both have a regular polygonal anti-slip structure 19. This arrangement effectively prevents the above-mentioned mechanical connection device from rotating when pouring concrete after installation, thereby improving stability.

[0025] like Figure 7 and Figure 8As shown, when the above-mentioned connecting device is constructed and installed, the upper steel bar 6, the upper joint nut 7, the inserted rod 9, the lower joint nut 10 and the lower steel bar 11 are first assembled, and the inserted rod 9 is passed through the sleeve 8; because the first tooth structure 5 and the second tooth structure 15 are engaged with each other, the connection strength of the entire mechanical connecting device is effectively improved.

[0026] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A sleeve for prefabricated piles, characterized in that: It includes a threaded sleeve portion and an elastic sleeve portion; The elastic sleeve portion is located on the top of the threaded sleeve portion, and the threaded sleeve portion and the elastic sleeve portion are an integrally formed structure; The outer wall of the threaded sleeve portion is provided with a first external thread; The outer diameter of the elastic sleeve portion increases from top to bottom, and the elastic sleeve portion is provided with a plurality of long grooves in a circular array, the long grooves extending from the top of the elastic sleeve portion to the bottom of the elastic sleeve portion, and the long grooves penetrate the inner and outer walls of the elastic sleeve portion; A plurality of first annular tooth structures are arranged on the inner wall of the elastic sleeve portion.

2. A mechanical connection device, characterized in that: It includes an upper steel bar, an upper joint nut, a sleeve, a plug rod, a lower joint nut and a lower steel bar; A first clamping portion is provided at the bottom of the upper steel bar, and the upper steel bar is clamped to the upper part of the upper joint nut through the first clamping portion, and the upper steel bar passes through the top of the upper joint nut; A first internal thread is provided on the lower inner wall of the upper joint nut, the first internal thread is matched with the first external thread, the sleeve is the sleeve according to claim 1, and the sleeve is threadably connected in the upper joint nut through the matching threads of the first external thread and the first internal thread; The bottom of the insertion rod has a connecting portion, and the connecting portion is provided with a second external thread; The upper inner wall of the lower joint nut is provided with a second internal thread, and the second internal thread is adapted to the second external thread; The connecting portion is threadedly connected in the lower joint nut, and the insertion rod is sleeved on the sleeve and passes through the top of the sleeve; The top of the lower steel bar is provided with a second clamping portion, the lower steel bar is clamped to the lower part of the lower joint nut through the second clamping portion, and the lower steel bar passes through the bottom of the lower joint nut.

3. A mechanical connection device according to claim 2, characterized in that: A plurality of annular second tooth structures are provided on the upper outer wall of the insertion rod, and the second tooth structures are adapted to the first tooth structures; The plurality of second tooth structures on the insertion rod are meshed with the plurality of annular first tooth structures on the inner wall of the elastic sleeve portion.

4. A mechanical connection device according to claim 3, characterized in that: The top of the insertion rod is provided with an introduction portion.

5. A mechanical connection device according to claim 2, characterized in that: The top of the upper joint nut and the bottom of the lower joint nut both have regular polygonal anti-slip structures.

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