Spring screw for tubular pile production

Abstract

The utility model discloses a spring screw for tubular pile production, which comprises a screw rod, a base and a nut seat, a gasket is sleeved on the upper portion of the outer surface of the screw rod, a spring body is sleeved on the outer surface of the screw rod and located on the lower portion of the gasket, the screw rod is inserted in an inner cavity of the base, the lower portion of the screw rod is connected with a clamping spring in a clamping mode through a clamping groove, and the nut seat is connected with a nut. A nut body is embedded in the nut seat, the bottom of the screw is in threaded connection with the nut body, and a U-shaped clamp is arranged on the nut seat. According to the spring screw, the screw rod, the gasket, the spring body, the clamping spring and the base are matched with one another, and when the spring screw is in a locked state in use, the spring body can be completely wrapped, so that the spring body can be well prevented from being in contact with cement mortar, and the service life of the spring screw is prolonged; the problem that in the using process of an existing spring screw for pipe pile production, a spring makes contact with cement mortar, and consequently the service life is short is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of spring screws, in particular to a spring screw for producing pipe piles. Background Art

[0002] Piles are divided into post-tensioned prestressed pipe piles and pre-tensioned prestressed pipe piles, prestressed concrete pipe piles (PC pipe piles), prestressed concrete thin-walled pipe piles (PTC pipe piles) and high-strength prestressed concrete pipe piles (PHC pipe piles). Pre-tensioned prestressed pipe piles are hollow cylindrical slender concrete prefabricated components made by pre-tensioned prestressing technology and centrifugal forming. They are mainly composed of cylindrical pile bodies, end plates and steel sleeves. Piles are divided into prestressed concrete pipe piles (PC pipe piles), prestressed concrete thin-walled pipe piles (PTC pipe piles) and prestressed high-strength concrete pipe piles (PHC pipe piles) according to concrete strength grade and wall thickness. The concrete strength of PC piles shall not be lower than C50 concrete, the strength grade of PTC pipe piles shall not be lower than C60, and the concrete strength grade of PHC piles shall not be lower than C80. PC piles and PTC piles are generally cured with normal pressure steam, and generally take 28 days before they can be injected. As for PHC piles, they need to be steamed in an autoclave after demoulding. After steam curing at 10 atmospheres and about 180 degrees, the concrete strength grade reaches C80. The shortest time from molding to use is only three or four days. Pipe piles need to be fixed with spring screws during the production and connection process. Spring screws are a special type of screws. Their structure is similar to that of ordinary screws, but a layer of spring is installed around the main thread, which makes them have good anti-loosening and shock-absorbing effects. When subjected to vibration or impact, spring screws can automatically adjust the tightness of the threads to prevent the screws from loosening. However, the spring screws used in the current production of pipe piles come into contact with cement mortar during use, resulting in a short service life. For this reason, we propose a spring screw for pipe pile production. Utility Model Content

[0003] The utility model aims to provide a spring screw for pipe pile production, which has the advantage of long service life and solves the problem that the spring of the spring screw for pipe pile production contacts with cement mortar during use, resulting in a short service life.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a spring screw for pipe pile production, comprising a screw rod, a base and a nut seat, the upper part of the outer surface of the screw rod is sleeved with a gasket, the outer surface of the screw rod and the lower part of the gasket is sleeved with a spring body, the screw rod is inserted into the inner cavity of the base, the lower part of the screw rod is clamped with a retaining spring through a clamping groove, the nut body is embedded in the nut seat, the bottom of the screw rod is threadedly connected to the nut body, and a U-shaped clamp is provided on the nut seat.

[0005] Preferably, the gasket and the upper opening of the base are both subjected to high-frequency heat treatment, and the bottom of the spring body is located at the upper part of the inner cavity of the base.

[0006] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0007] The utility model can form a spring screw through a screw rod, a gasket, a spring body, a retaining spring and a base, and the bottom of the spring body extends to the inner cavity of the base. When in use, the nut body, the nut seat and the U-shaped clip can cooperate with the spring screw to fix the pipe pile. During the fixing process, components on the pipe pile will be clamped between the base and the nut seat, so that the base can move and the spring body can be completely wrapped, thereby effectively preventing the spring body from contacting with cement mortar, thereby improving the service life of the spring screw. The spring body has a certain preload. When the assembly is completed, the surface of the retaining spring is tightly against the stop position of the base, and the tension of the spring body is Under the action, the screw and the base can be very well vertical. High-frequency heat treatment is performed on the gasket and the upper end of the base to increase the surface hardness, thereby extending the service life of the spring screw. When the screw is pressed and tightened with a pneumatic gun, the spring screw and the nut body lock the opening plates of the upper and lower molds to achieve the effect of closing the mold. When the screw is loosened with a pneumatic gun, the spring body automatically lifts the screw to achieve the effect of quick separation of the upper and lower molds. The simple structure not only increases the service life of the spring screw, but also facilitates maintenance and replacement, solving the problem of short service life of the spring screws used in the current pipe pile production due to contact between the spring and cement mortar during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model;

[0009] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0010] In the figure: 1. screw; 2. gasket; 3. spring body; 4. retaining ring; 5. base; 6. nut body; 7. nut seat; 8. U-shaped clip. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0012] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0013] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] See also Figure 1-2 A spring screw for pipe pile production comprises a screw rod 1, a base 5 and a nut seat 7. A gasket 2 is sleeved on the upper part of the outer surface of the screw rod 1, and a spring body 3 is sleeved on the outer surface of the screw rod 1 and located below the gasket 2. The screw rod 1 is inserted into the inner cavity of the base 5, and a retaining ring 4 is clamped at the lower part of the screw rod 1 through a clamping groove. A nut body 6 is embedded on the nut seat 7. The bottom of the screw rod 1 is threadedly connected to the nut body 6. A U-shaped clamp 8 is arranged on the nut seat 7. The upper openings of the gasket 2 and the base 5 are both subjected to high-frequency heat treatment, and the bottom of the spring body 3 is located at the upper part of the inner cavity of the base 5.

[0015] When in use, a spring screw can be formed by means of the screw rod 1, the gasket 2, the spring body 3, the retaining spring 4 and the base 5, and the bottom of the spring body 3 extends to the inner cavity of the base 5. When in use, the nut body 6, the nut seat 7 and the U-shaped retaining spring 8 can cooperate with the spring screw to fix the pipe pile. During the fixing process, components on the pipe pile will be clamped between the base 5 and the nut seat 7, so that the base 5 can move and the spring body 3 can be completely wrapped, thereby effectively preventing the spring body 3 from contacting with the cement mortar, thereby improving the service life of the spring screw. The spring body 3 has a certain preload. When the assembly is completed, the surface of the retaining spring 4 is close to the stop position of the base 5. Under the tension of the body 3, the screw 1 and the base 5 can be well vertical. The gasket 2 and the upper mouth of the base 5 are subjected to high-frequency heat treatment to increase their surface hardness, thereby extending the service life of the spring screw. When the screw 1 is pressed and tightened with a pneumatic gun, the spring screw and the nut body 6 lock the opening plates of the upper and lower molds to achieve the effect of closing the mold. When the screw 1 is loosened with a pneumatic gun, the spring body 3 automatically lifts the screw 1 to achieve the effect of quick separation of the upper and lower molds. The simple structure not only improves the service life of the spring screw, but also facilitates maintenance and replacement, thereby solving the problem of short service life of the spring screws used in the current pipe pile production due to contact between the spring and cement mortar during use.

[0016] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spring screw for pipe pile production, comprising a screw rod (1), a base (5) and a nut seat (7), characterized in that: The upper part of the outer surface of the screw rod (1) is sleeved with a gasket (2), the outer surface of the screw rod (1) and the lower part of the gasket (2) is sleeved with a spring body (3), the screw rod (1) is inserted into the inner cavity of the base (5), the lower part of the screw rod (1) is clamped with a retaining spring (4) through a clamping groove, the nut body (6) is embedded in the nut seat (7), the bottom of the screw rod (1) is threadedly connected to the nut body (6), and a U-shaped clamp (8) is provided on the nut seat (7).

2. The spring screw for pipe pile production according to claim 1, characterized in that: The upper ends of the gasket (2) and the base (5) are both subjected to high-frequency heat treatment, and the bottom of the spring body (3) is located at the upper part of the inner cavity of the base (5).

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