Mechanical connecting device for precast pile and capable of effectively improving connecting strength

Abstract

The device comprises an upper reinforcing steel bar, an upper joint nut, a spring, a sleeve assembly, a middle nut, an insertion rod, a lower joint nut and a lower reinforcing steel bar, a first internal thread is arranged on the inner wall of the lower part of the upper joint nut; a first external thread is arranged on the outer wall of the middle nut, and the middle nut is in threaded connection with the interior of the upper joint nut through matching of the first external thread and the first internal thread; a step part is arranged in the middle nut, and the inner diameter of the middle nut is gradually increased upwards from the step part; the sleeve assembly comprises a plurality of arc-shaped pieces, and the arc-shaped pieces form the sleeve assembly with the small lower end and the large upper end. The sleeve assembly is placed on the step part in the middle nut; the spring is arranged in the upper joint nut; a connecting part is arranged at the bottom of the inserting rod, a second external thread is arranged on the connecting part, and a second internal thread is arranged on the inner wall of the upper part of the lower joint nut. The connecting strength of the whole mechanical connecting device is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of precast piles, in particular to a mechanical connecting device for precast piles that can effectively improve the connection strength. Background Art

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

[0003] In the existing mechanical connecting device for precast piles, the insertion rod and the sleeve are not stably connected. After installation, under the action of force, the insertion rod often disengages from the sleeve, and the sleeve is often easily damaged when inserted into the insertion rod.

[0004] It is expected to provide a mechanical connecting device for precast piles that can effectively improve the connection strength, which can solve the above technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a mechanical connecting device for precast piles that can effectively improve the connection strength, and effectively improve the connection strength of the entire mechanical connecting device.

[0006] The mechanical connecting device for precast piles that can effectively improve the connection strength includes an upper steel bar, an upper joint nut, a spring, a sleeve assembly, an intermediate nut, an insertion rod, a lower joint nut and a lower steel bar;

[0007] Clamping portions are provided at the bottom of the upper steel bar and the top of the lower steel bar;

[0008] The upper steel bar is clamped in the upper joint nut through its own clamping portion, and the upper steel bar passes through the top of the upper joint nut;

[0009] The lower steel bar is clamped in the lower joint nut through its own clamping portion, and the lower steel bar passes through the bottom of the lower joint nut;

[0010] The inner wall of the lower part of the upper joint nut is provided with a first internal thread;

[0011] The outer wall of the intermediate nut is provided with a first external thread, and the first external thread is adapted to the first internal thread. The intermediate nut is threadedly connected in the upper joint nut through the cooperation of the first external thread and the first internal thread;

[0012] A stepped portion is provided in the intermediate nut, and the inner diameter of the intermediate nut gradually increases upward from the stepped portion, forming a flared structure;

[0013] The sleeve assembly includes a number of arc-shaped pieces, and the number of arc-shaped pieces forms a sleeve assembly with a smaller lower end and a larger upper end; the sleeve assembly is placed on the stepped portion inside the intermediate nut;

[0014] The spring is arranged inside the upper joint nut and is located above the intermediate nut;

[0015] The bottom of the insertion rod is provided with a connecting portion, 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, the second external thread is adapted to the second internal thread, and the insertion rod is threadedly connected inside the lower joint nut through the second external thread on the connecting portion, and the insertion rod sequentially passes through the lower joint nut, the intermediate nut and the sleeve assembly.

[0016] Specifically, the number of the arc-shaped pieces is 4.

[0017] Preferably, the top of the insertion rod is provided with a guiding portion.

[0018] Preferably, a number of annular first tooth-shaped structures are provided on the inner wall of the sleeve assembly formed by a number of the arc-shaped pieces, a number of annular second tooth-shaped structures are provided on the outer wall of the upper part of the insertion rod, and the number of the second tooth-shaped structures is engaged with the number of the first tooth-shaped structures.

[0019] Preferably, both the top of the upper joint nut and the bottom of the lower joint nut are provided with regular polygon anti-slip structures.

[0020] Preferably, a gasket is further arranged inside the upper joint nut, the gasket is located directly above the sleeve assembly, the gasket is clamped on the top of the insertion rod, and the bottom of the spring is in contact with the gasket.

[0021] The mechanical connection device for precast piles of the present utility model, which effectively improves the connection strength, has the following advantages compared with the prior art:

[0022] (1) The sleeve is divided into a number of arc-shaped pieces, which effectively improves the strength of its connection with the insertion rod, and during installation, if any arc-shaped piece is damaged, a new arc-shaped piece can be replaced;

[0023] (2) A number of annular second tooth-shaped structures are provided on the outer wall of the upper part of the insertion rod, and the number of the second tooth-shaped structures on the insertion rod is engaged with the number of annular first tooth-shaped structures on the inner wall of the sleeve assembly, which can improve the connection strength between the insertion rod and the sleeve;

[0024] (3) The structure is simple and the use is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an exploded view of the mechanical connection device for precast piles that effectively improves the connection strength provided by this embodiment;

[0026] Figure 2 Schematic diagram of the upper steel bar and the lower steel bar provided in this embodiment;

[0027] Figure 3 Schematic diagram of the upper joint nut provided in this embodiment;

[0028] Figure 4 Schematic diagram of the intermediate nut provided in this embodiment;

[0029] Figure 5 Cross-sectional view of the intermediate nut provided in this embodiment;

[0030] Figure 6 Schematic diagram of the sleeve assembly provided in this embodiment;

[0031] Figure 7 Schematic diagram of the insertion rod provided in this embodiment;

[0032] Figure 8 Schematic diagram of the lower joint nut provided in this embodiment;

[0033] Figure 9 Cross-sectional view of the mechanical connection device for precast piles provided in this embodiment, which effectively improves the connection strength;

[0034] Figure 10 Schematic diagram of the mechanical connection device for precast piles provided in this embodiment, which effectively improves the connection strength. Detailed implementation manners

[0035] The following further describes the present invention in conjunction with the accompanying drawings and specific embodiments.

[0036] Embodiment

[0037] As Figure 1 shown, the mechanical connection device for precast piles provided in this embodiment, which effectively improves the connection strength, includes an upper steel bar 1, an upper joint nut 2, a spring 3, a sleeve assembly 4, an intermediate nut 5, an insertion rod 6, a lower joint nut 7, and a lower steel bar 8.

[0038] As Figure 2 shown, clamping portions 9 are provided at the bottom of the upper steel bar 1 and the top of the lower steel bar 8; the upper steel bar 1 is clamped in the upper joint nut 2 through its own clamping portion, and the upper steel bar 1 passes through the top of the upper joint nut 2; the lower steel bar 8 is clamped in the lower joint nut 7 through its own clamping portion, and the lower steel bar 8 passes through the bottom of the lower joint nut 7.

[0039] As Figure 3 shown, the lower inner wall of the upper joint nut 2 is provided with a first internal thread 10; As Figure 4As shown, a first external thread 11 is provided on the outer wall of the intermediate nut 5, and the first external thread 11 is adapted to the first internal thread 10. The intermediate nut 5 is threadedly connected within the upper joint nut 2 through the cooperation of the first external thread 11 and the first internal thread 10; As Figure 5 As shown, a stepped portion 12 is provided within the intermediate nut 5, and the inner diameter of the intermediate nut 5 gradually increases upward from the stepped portion 12, forming a flared structure 13.

[0040] As Figure 6 As shown, the sleeve assembly 4 includes a plurality of arc-shaped pieces 14. The plurality of arc-shaped pieces 14 form a sleeve assembly with a smaller lower end and a larger upper end. In this embodiment, the number of arc-shaped pieces 14 is 4; The sleeve assembly 4 is placed on the stepped portion 12 within the intermediate nut 5.

[0041] The spring 3 is disposed within the upper joint nut 2 and is located above the intermediate nut 5.

[0042] As Figure 7 As shown, a connecting portion is provided at the bottom of the insertion rod 6, and a second external thread 15 is provided on the connecting portion. As Figure 8 As shown, a second internal thread 16 is provided on the upper inner wall of the lower joint nut 7. The second external thread 15 is adapted to the second internal thread 16. The insertion rod 6 is threadedly connected within the lower joint nut 7 through the second external thread 15 on the connecting portion, and the insertion rod 6 sequentially passes through the lower joint nut 7, the intermediate nut 5, and the sleeve assembly 4.

[0043] In this embodiment, a guiding portion 17 is provided at the top of the insertion rod 6 to facilitate the insertion and installation of the insertion rod 6.

[0044] In this embodiment, a plurality of annular first toothed structures 19 are provided on the inner wall of the sleeve assembly 4 formed by the plurality of arc-shaped pieces 14. A plurality of annular second toothed structures 18 are provided on the upper outer wall of the insertion rod 6. The plurality of second toothed structures 18 are engaged with the plurality of first toothed structures 19. With this arrangement, the connection strength between the insertion rod 6 and the sleeve assembly 4 is improved.

[0045] In this embodiment, regular polygon anti-slip structures 20 are provided at the top of the upper joint nut 2 and the bottom of the lower joint nut 7, effectively preventing the entire mechanical connection device from sliding during concrete pouring.

[0046] In this embodiment, as Figure 1 and Figure 9 As shown, a gasket is further provided within the upper joint nut 2. The gasket is located directly above the sleeve assembly. The gasket is snap-fitted to the top of the insertion rod, and the bottom of the spring is in contact with the gasket; With this arrangement, an effective guiding effect is exerted on the spring.

[0047] When the above mechanical connection device is installed, as Figure 9 and Figure 10 shown, first, assemble the upper steel bar 1, upper joint nut 2, inserting rod 6, intermediate nut 5, lower joint nut 7 and lower steel bar 8. Place a number of arc-shaped pieces 14 in the step portion 12 of the intermediate nut 5 to form a sleeve assembly 4, and make the inserting rod 6 pass through the sleeve assembly 4. Since the first toothed structure 19 and the second toothed structure 18 mesh with each other, the connection strength of the entire mechanical connection device is effectively improved, and the connection strength of the entire mechanical connection device is further effectively improved under the action of the elastic force of the spring 3.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A mechanical connection device for precast piles that effectively improves the connection strength, characterized in that, It includes an upper steel bar, an upper joint nut, a spring, a sleeve assembly, an intermediate nut, a plug rod, a lower joint nut and a lower steel bar; The bottom of the upper steel bar and the top of the lower steel bar are both provided with clamping portions; The upper steel bar is clamped in the upper joint nut through its own clamping portion, and the upper steel bar passes through the top of the upper joint nut; The lower steel bar is clamped in the lower joint nut through its own clamping portion, and the lower steel bar passes through the bottom of the lower joint nut; The inner wall of the lower part of the upper joint nut is provided with a first internal thread; The outer wall of the intermediate nut is provided with a first external thread, and the first external thread is adapted to the first internal thread. The intermediate nut is threadedly connected in the upper joint nut through the cooperation of the first external thread and the first internal thread; The intermediate nut is provided with a stepped portion, and the inner diameter of the intermediate nut gradually increases upward from the stepped portion, forming a flared structure; The sleeve assembly includes a plurality of arc-shaped pieces, and the plurality of arc-shaped pieces form a sleeve assembly with a smaller lower end and a larger upper end; the sleeve assembly is placed on the stepped portion in the intermediate nut; The spring is arranged in the upper joint nut and is located above the intermediate nut; The bottom of the plug rod is provided with a connecting portion, and the connecting portion is provided with a second external thread. The inner wall of the upper part of the lower joint nut is provided with a second internal thread, and the second external thread is adapted to the second internal thread. The plug rod is threadedly connected in the lower joint nut through the second external thread on the connecting portion, and the plug rod sequentially passes through the lower joint nut, the intermediate nut and the sleeve assembly.

2. The mechanical connection device for precast piles that effectively improves the connection strength according to claim 1, characterized in that, The number of the arc-shaped pieces is 4.

3. The mechanical connection device for precast piles that effectively improves the connection strength according to claim 1, wherein, The top of the plug rod is provided with a guiding portion.

4. The mechanical connection device for precast piles that effectively improves the connection strength according to claim 1, characterized in that, A plurality of annular first tooth-shaped structures are provided on the inner wall of the sleeve assembly formed by the plurality of arc-shaped pieces, and a plurality of annular second tooth-shaped structures are provided on the outer wall of the upper part of the plug rod. The plurality of second tooth-shaped structures are engaged with the plurality of first tooth-shaped structures.

5. The mechanical connection device for precast piles that effectively improves the connection strength according to claim 1, wherein, Both the top of the upper joint nut and the bottom of the lower joint nut are provided with regular polygon anti-slip structures.

6. The mechanical connection device for precast piles that effectively improves the connection strength according to any one of claims 1 to 5, characterized in that, A gasket is further arranged in the upper joint nut. The gasket is located directly above the sleeve assembly. The gasket is clamped on the top of the plug rod, and the bottom of the spring is in contact with the gasket.

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