Nut sleeve, pre-tightening mechanical connector and precast pile

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By setting an open groove on the side wall of the nut sleeve, the driving screw drives the preload nut sideways to rotate, the problem of lowering gap and strength of the rear end surface of the prefabricated pile connection is solved, and the flush and strength improvement of the end of the prefabricated pile is achieved.

CN223163865UActive Publication Date: 2025-07-29HUBEI JIEGU CONSTR TECH CO LTD

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Patent Information

Application Number: CN202422428519.1
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-10-08
Publication Date: 2025-07-29
Estimated Expiration: 2034-10-08

AI Technical Summary

Technical Problem

After the existing prefabricated piles are connected, there is a gap between the connecting end faces of the two prefabricated piles, resulting in unqualified detection and the connection end face being crushed or exploded. At the same time, the strength of the end of the prefabricated pile is reduced due to the pit structure of the driving screw.

Method used

An opening groove is provided on the side wall of the nut sleeve so that the driving screw can drive the preload nut sideways to rotate, eliminate pits at the end of the prefabricated pile, ensure that the end is flush with the prefabricated pile, and adopt the opening groove depth to the diameter of the driving screw, with a width of 15-25mm, and the side and bottom surfaces are arc transition structures, with an inner diameter of 1-2mm larger than the outer diameter of the prefabricated nut transmission part.

Benefits of technology

The flush of the ends of the prefabricated piles is achieved, the pits are eliminated, the strength of the prefabricated piles is improved, and the problem of reducing the end strength is avoided.

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Abstract

The utility model discloses a nut sleeve, a pre-tightening mechanical connector and a precast pile. The nut sleeve comprises a nut sleeve body, a nut and a nut, one end of the nut sleeve body is a main reinforcement connecting part used for being connected with a main reinforcement, and the other end of the nut sleeve body is a pre-tightening nut connecting part used for being connected with a pre-tightening nut. An open groove is formed in the side wall, located at one end of the pre-tightening nut connecting part, of the nut sleeve body, so that the driving screw can laterally drive the pre-tightening nut arranged in the nut sleeve body to rotate through the open groove. According to the nut sleeve disclosed by the invention, the open slot is formed in the side wall of the nut sleeve body, so that the driving screw rod can laterally drive the pre-tightening nut arranged in the nut sleeve body to rotate through the open slot, the end part of the large nut sleeve can be flush with the end part of a precast pile, and a pit at the end part of the precast pile is eliminated; and the strength of the end part of the precast pile is ensured.

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Description

Technical Field

[0001] The utility model relates to the technical field of precast pile connection, in particular to a nut sleeve, a pre-tightening mechanical joint and a precast pile. Background Art

[0002] Generally, engineering piles (precast piles) are multi-section piles. The existing precast concrete pile ends are generally quickly connected between piles through mechanical joints.

[0003] However, after the existing mechanical joints are used to connect precast piles, there will be a gap between the connecting end faces of two precast piles, resulting in unqualified inspection problems when using small strain to detect the integrity of the formed pile; at the same time, there will be a gap between the connecting end faces of two precast piles, and then during the pile driving process, the connecting end faces of the precast piles will be damaged or the piles will burst.

[0004] In order to solve the problem that there will be a gap between the connecting end faces of two precast piles after the existing mechanical joints are used to connect precast piles, relevant technical personnel have developed a pre-tightening mechanical joint, such as Figure 1 As shown, it includes components such as a large nut sleeve 4, a small nut sleeve 1, a plug rod 2 and a pre-tightening nut 3. The small nut sleeve 1 is connected to the plug rod 2. The large nut sleeve 4 is provided with a pre-tightening nut 3. The pre-tightening nut 3 is provided with a transmission part. After the plug rod 2 is inserted into the pre-tightening nut 3, the transmission part can be driven by a driving screw 5 from the side of the pre-tightening nut, so that the pre-tightening nut 3 moves along the axial direction of the large nut sleeve 4, thereby realizing the locking of the plug rod and the pre-tightening nut and eliminating the gap at the end of the precast pile.

[0005] However, as Figure 1 , Figure 2 and Figure 3 shown, in the existing pre-tightening mechanical joints, in order to facilitate the driving screw to drive the pre-tightening nut to rotate from the side of the pre-tightening nut and then move along the axial direction of the large nut sleeve, the transmission part of the pre-tightening nut needs to be provided outside the large nut sleeve. At the same time, in order to enable the driving screw to drive the pre-tightening nut after the precast concrete piles are connected, a certain pit 60 needs to be reserved at the end of the precast pile (the end of the large nut sleeve is located at the bottom of the pit), so that there are multiple pits 60 at the end of the precast pile, thereby reducing the strength of the precast pile and affecting the performance of the precast pile. Summary of the Utility Model

[0006] The utility model provides a nut sleeve for solving the above problems.

[0007] The technical means adopted by the utility model are as follows:

[0008] A nut sleeve, comprising: a nut sleeve body;

[0009] One end of the nut sleeve body is a main reinforcement connection part for connecting with the main reinforcement, and the other end is a pre-tightening nut connection part for connecting with the pre-tightening nut;

[0010] An opening groove is provided on the side wall of one end of the nut sleeve body located at the pre-tightening nut connection part, so that the driving screw can laterally drive the pre-tightening nut placed in the nut sleeve body to rotate through the opening groove.

[0011] Further, the depth of the opening groove is the same as the diameter of the driving screw.

[0012] Further, the depth of the opening groove is 5 - 15 mm.

[0013] Further, the width of the opening groove is 15 - 25 mm.

[0014] Further, the opening groove is formed by stamping.

[0015] Further, an arc transition structure is provided between the side surface and the bottom surface of the opening groove.

[0016] Further, an internal thread for connecting with the pre-tightening nut is provided in the pre-tightening nut connection part, and the opening groove is located outside the internal thread.

[0017] Further, the inner diameter of the part of the nut sleeve body provided with the opening groove is 1 - 2 mm larger than the outer diameter of the transmission part of the pre-tightening nut.

[0018] A pre-tightening mechanical joint includes a large nut sleeve, a small nut sleeve, a plug rod, a pre-tightening nut, and a driving screw. The plug rod is connected to the small nut sleeve, the pre-tightening nut is connected to the large nut sleeve, the large nut sleeve adopts the nut sleeve disclosed in the present application, and the driving screw can laterally drive the pre-tightening nut placed in the large nut sleeve to rotate through the opening groove.

[0019] A precast pile includes a precast pile body and main reinforcements arranged in the precast pile body, and also includes the pre-tightening mechanical joint of the present application.

[0020] Compared with the prior art, the nut sleeve disclosed by the present utility model has the following beneficial effects: In the present application, since an opening groove is provided on the side wall of the nut sleeve body, the driving screw can laterally drive the pre-tightening nut placed in the nut sleeve body to rotate through the opening groove, so that the end of the large nut sleeve can be flush with the end of the precast pile, eliminating the pit at the end of the precast pile and ensuring the strength of the end of the precast pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a pre-tightening mechanical joint disclosed in the prior art;

[0022] Figure 2 Schematic structural diagram of a precast pile using an existing pre-tightening mechanical joint;

[0023] Figure 3 Schematic end view of a precast pile using an existing pre-tightening mechanical joint;

[0024] Figure 4 Axonometric view of the nut sleeve disclosed by the present utility model;

[0025] Figure 5 Front view of the nut sleeve disclosed by the present utility model;

[0026] Figure 6 is Figure 5 right view of;

[0027] Figure 7 Pre-tightening mechanical joint with the nut sleeve disclosed by the present utility model, only including a large nut sleeve, a pre-tightening nut and a driving screw in the figure;

[0028] Figure 8 Schematic end face structure diagram of a precast pile with the pre-tightening mechanical joint disclosed by the present utility model;

[0029] Figure 9 is Figure 8 enlarged schematic diagram of the dashed box in;

[0030] Figure 10 Axonometric view (partial) of a precast pile with the pre-tightening mechanical joint disclosed by the present utility model;

[0031] Figure 11 is Figure 10 enlarged schematic diagram of the dashed box in.

[0032] In the figure: 1, small nut sleeve; 2, inserting rod; 3, pre-tightening nut; 4, large nut sleeve; 5, driving screw; 6, precast pile; 60, pit; 61, driving screw insertion groove; 40, nut sleeve body; 41, main reinforcement connection part; 42, pre-tightening nut connection part; 43, opening groove; 44, side surface of the opening groove; 45, bottom surface of the opening groove; 46, arc transition structure; 47, internal thread; 48, smooth wall section. Specific embodiments

[0033] As Figure 4 , Figure 5 and Figure 6 shown, the nut sleeve disclosed by the present utility model includes: a nut sleeve body 40; ]

[0034] One end of the nut sleeve body 40 is a main reinforcement connection part 41 for connecting with the main reinforcement, and the other end is a pre-tightening nut connection part 42 for connecting with the pre-tightening nut 3;

[0035] An opening groove 43 is provided on the side wall at one end of the nut sleeve body 40 located at the pre-tightening nut connecting portion 42, so that the driving screw 5 can laterally drive the pre-tightening nut 3 placed in the nut sleeve body 40 to rotate through the opening groove 43.

[0036] Specifically, one end of the nut sleeve body disclosed in the present application is a main reinforcement connecting portion for connecting the main reinforcement in the precast pile body. The main reinforcement connecting portion can be set into a structure such as a pier head clamping structure, a threaded hole or a tapered hole according to needs, so as to facilitate connection with the main reinforcement in the form of PC steel bars, threaded steel bars or steel strands, etc. The other end of the pre-tightening nut body is provided with an internal thread for connecting with the pre-tightening nut. An opening groove is also provided on the side wall at one end of the nut sleeve body located at the pre-tightening nut connecting portion, so that the driving screw 5 can laterally drive the pre-tightening nut 3 placed in the nut sleeve body 40 to rotate through the opening groove 43, thereby realizing the axial movement of the pre-tightening nut along the nut sleeve.

[0037] As Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 shown, in the present application, since an opening groove is provided on the side wall at one end of the nut sleeve body located at the pre-tightening nut connecting portion, the driving screw 5 can laterally drive the pre-tightening nut 3 placed in the nut sleeve body 40 to rotate through the opening groove 43. Thus, when using the pre-tightening mechanical joint disclosed in the present application for precast pile connection, the end of the large nut sleeve can be flush with the end of the precast pile, and thus there is no need to reserve a concave pit structure for driving the pre-tightening nut to rotate at the end of the precast pile, thereby ensuring the end strength of the precast pile.

[0038] Furthermore, the depth of the opening groove 43 is consistent with the diameter of the driving screw 5.

[0039] Specifically, in order to enable the pre-tightening nut to be rotated by the driving screw during precast pile connection, a driving screw insertion groove 61 for inserting the driving screw is provided at the end of the precast pile. After the driving screw drives the pre-tightening nut to rotate and completes the locking between the pre-tightening nut and the inserting rod, the driving screw remains in the driving screw insertion groove, that is, the driving screw fills the driving screw insertion groove. The depth of the opening groove of the large nut sleeve is consistent with the diameter of the driving screw, so that the driving screw can effectively fill the driving screw insertion side, thereby avoiding the reduction of the pile end strength caused by the driving screw insertion groove provided at the end of the precast pile. On the contrary, since the driving screw is generally a metal component and its strength is higher than that of concrete, the driving screw remaining in the driving screw insertion side can improve the strength of the pile end. In the present application, the depth of the opening groove is the distance between the end face of the nut sleeve and the bottom surface of the opening groove ( Figure 5(as shown by H in the figure represents the depth of the open slot).

[0040] Furthermore, the depth of the open slot 43 is 5 - 15 mm.

[0041] Specifically, in a preferred embodiment, the depth of the open slot is 5 - 15 mm. Correspondingly, the diameter of the driving screw is also within the range of 5 - 15 mm. The driving screw within this range can ensure good strength of the driving screw to drive the pre-tightening nut to rotate.

[0042] Furthermore, the width of the open slot 43 is 15 - 25 mm. Preferably, the open slot 43 is formed by stamping.

[0043] Specifically, the width of the open slot is 15 - 25 mm ( Figure 5 as shown by W in the figure represents the width of the open slot). Within this width range, the widths of the two side surfaces of the open slot (in the direction along the wall thickness of the nut sleeve) can be within a relatively reasonable range, that is, it can avoid the increase in the side width of the open slot due to the over-wide width of the open slot, which affects its processing performance (the open slot is generally formed by stamping, and the increase in the side width of the open slot causes an increase in the stamping thickness, which is likely to cause deformation or damage of the nut sleeve during stamping), and can ensure that there is sufficient contact area between the driving screw and the pre-tightening nut to drive the pre-tightening nut to rotate.

[0044] Furthermore, an arc transition structure 46 is provided between the side surface 44 of the open slot and the bottom surface 45 of the open slot.

[0045] Specifically, the arc transition structure 46 between the side surface 44 of the open slot and the bottom surface 45 of the open slot can ensure uniform stress on the nut sleeve during stamping and prevent damage to the nut sleeve during processing.

[0046] Furthermore, an internal thread 47 for connecting with the pre-tightening nut 3 is provided inside the pre-tightening nut connection part 42, and the open slot 43 is located outside the part with the internal thread.

[0047] Specifically, one end of the nut sleeve body disclosed in this application is a structure such as a swaged joint structure, a threaded hole or a tapered hole, etc., for facilitating connection with main reinforcement in the form of PC steel bars, threaded steel bars or steel strands, etc. The other end is provided with an internal thread for connecting with the external thread on the pre-tightening nut. There is a certain distance between the starting position of the internal thread in the nut sleeve body and the end of the nut sleeve body, so that a part of the length of the pre-tightening nut connection part 42 of the nut sleeve body becomes a smooth wall section 48, and the open slot is arranged on the smooth wall section 48. This structure can not only ensure an effective connection length between the pre-tightening nut and the nut sleeve, but also ensure the strength of the end of the precast pile.

[0048] Furthermore, the inner diameter of the part of the nut sleeve body 40 provided with the opening groove 43 is 1-2 mm larger than the outer diameter of the transmission part of the pre-tightening nut 3.

[0049] Specifically, that is, the inner diameter of the smooth wall section of the nut sleeve is 1-2 mm larger than the outer diameter of the transmission part of the pre-tightening nut, which can effectively eliminate the interference generated between the inner diameter of the smooth wall section and the transmission part of the pre-tightening nut when the pre-tightening nut rotates, so as to facilitate driving the pre-tightening nut to rotate.

[0050] A pre-tightening mechanical joint includes a large nut sleeve, a small nut sleeve, a plug rod, a pre-tightening nut and a driving screw. The plug rod is connected to the small nut sleeve, the pre-tightening nut is connected to the large nut sleeve, the large nut sleeve adopts the nut sleeve disclosed in the present application, and the driving screw can laterally drive the pre-tightening nut placed in the large nut sleeve to rotate through the opening groove.

[0051] Specifically, the precast pile is provided with precast pile main reinforcement bars. The two ends of the precast pile main reinforcement bars are respectively connected to the large nut sleeve and the small nut sleeve. The small nut sleeve is threadedly connected to the plug rod. The large nut sleeve is provided with a pre-tightening nut. The transmission part of the pre-tightening nut corresponds to the position of the nut sleeve body provided with the opening groove, so that the driving screw can laterally drive the pre-tightening nut placed in the large nut sleeve to rotate through the opening groove.

[0052] In the present application, since the opening groove is provided on the side wall of one end of the nut sleeve body at the connection part of the pre-tightening nut, the driving screw 5 can laterally drive the pre-tightening nut placed in the nut sleeve body 40 to rotate through the opening groove 43. Furthermore, when the pre-tightening mechanical joint disclosed in the present application is used for connecting precast piles, the end of the large nut sleeve can be flush with the end of the precast pile. Furthermore, there is no need to reserve a pit structure at the end of the precast pile for driving the pre-tightening nut to rotate, thus ensuring the end strength of the precast pile.

[0053] A precast pile includes a precast pile body and main reinforcement bars arranged in the precast pile body, and also includes the pre-tightening mechanical joint of the present application.

[0054] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A nut sleeve, characterized in that, Comprising: A nut sleeve body; One end of the nut sleeve body is a main reinforcement connection part for connecting with the main reinforcement, and the other end is a pre-tightening nut connection part for connecting with the pre-tightening nut; An opening groove is provided on the side wall of one end of the nut sleeve body located at the pre-tightening nut connection part, so that the driving screw can laterally drive the pre-tightening nut placed in the nut sleeve body to rotate through the opening groove.

2. The nut sleeve according to claim 1, wherein: The depth of the opening groove is consistent with the diameter of the driving screw.

3. The nut sleeve according to claim 2, wherein: The depth of the opening groove is 5 - 15 mm.

4. The nut sleeve according to claim 3, wherein: The width of the opening groove is 15 - 25 mm.

5. The nut sleeve according to claim 4, characterized in that: The opening groove is formed by stamping.

6. The nut sleeve according to claim 5, wherein: The side surface and the bottom surface of the opening groove are in an arc transition structure.

7. The nut sleeve according to claim 6, characterized in that: Internal threads for connecting with the pre-tightening nut are provided in the pre-tightening nut connection part, and the opening groove is located outside the part with internal threads.

8. The nut sleeve according to claim 7, wherein: The inner diameter of the part of the nut sleeve body provided with the opening groove is 1 - 2 mm larger than the outer diameter of the transmission part of the pre-tightening nut.

9. A pre-tightening mechanical joint, comprising a large nut sleeve, a small nut sleeve, an insertion rod, a pre-tightening nut and a driving screw. The insertion rod is connected to the small nut sleeve, and the pre-tightening nut is connected to the large nut sleeve. It is characterized in that: The large nut sleeve adopts the nut sleeve according to any one of claims 1 to 8, and the driving screw can laterally drive the pre-tightening nut placed in the large nut sleeve to rotate through the opening groove.

10. A precast pile, comprising a precast pile body and main reinforcement bars arranged in the precast pile body, characterized in that: It further includes the pre-tightening mechanical joint according to claim 9.