Encircling type clamping block, sleeve assembly and prefabricated part

Abstract

The utility model relates to the technical field of prefabricated parts, and particularly discloses a surrounding type clamping block, a sleeve assembly and a prefabricated part. The surrounding type clamping block comprises a clamping block body, a through hole is formed in the top face of the clamping block body, a side opening communicated with the through hole is formed in the side face of the clamping block body, a limiting structure is arranged on the top face of the clamping block body, and the limiting structure is used for limiting a prestressed steel bar arranged in the through hole in a penetrating mode to move towards the side opening. The prestressed reinforcement can be prevented from sliding towards the side opening of the clamping block, the eccentric stress of the prestressed reinforcement is greatly reduced, and the tensile strength of the prestressed reinforcement is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of precast components, in particular to an embracing chuck, a sleeve assembly and a precast component. Background Technique

[0002] At present, with the rapid development of urban construction in China, prestressed concrete piles are widely used in key areas of infrastructure construction such as industrial and civil buildings, municipal bridges, and expressways due to their characteristics of factory production, energy conservation and environmental protection, high bearing capacity, and wide application range. The end plate of the existing prestressed concrete component is connected to the steel reinforcement cage. In the tensioning process of the precast pile, the end plate plays the role of anchoring the prestressed steel bars, and the end plate is the component that bears the prestress during prestress tensioning. A plurality of mutually connected steel bar anchor holes of different sizes are arranged on the surface of the end plate, among which the large holes are tensioning screw holes (bar passing holes), and the small holes are countersunk holes. The above-mentioned multiple groups of steel bar anchor holes are evenly distributed on the surface of the end plate as a whole, and the number of steel bar anchor holes is the same as the number of steel bars.

[0003] When assembling the end plate and the prestressed steel bars, the headed steel bars need to be first passed through the end plate through the tensioning screw holes (bar passing holes), and then moved to the countersunk holes, so as to clamp the head in the countersunk holes. The existing method mainly has the following problems:

[0004] 1. The processing process of the existing end plate is complex and the cost is high, accounting for a large proportion of the overall cost of the precast component.

[0005] 2. There is a distance between the tensioning screw holes (bar passing holes) and the countersunk holes of the end plate. During the tensioning process, the tensile force provided by the tensioning screw and the contraction force in the opposite direction of the prestressed steel bar are not on the same straight line, and the acting force will generate eccentric force. The end plate will deform due to this eccentric force, and it is difficult to ensure the flatness of the pile end face.

[0006] 3. The connection method between the steel bars and the end plate is not easy for workers to operate, and the on-site construction difficulty is large.

[0007] In response to this, some methods of using mechanical sleeves instead of end plates to tension prestressed steel bars have also emerged in the prior art. For example, the Chinese utility model patent with the publication number CN218061054U discloses a similar structure. However, it is found in actual application that when the steel bar is subjected to tensile force, due to an opening on the side of the chuck, there is a lack of restraint on the steel bar and the steel bar head, and the contact supporting surface between the chuck and the steel bar head is designed as an inclined surface. The whole steel bar will slide and tilt towards the side opening, aggravating the eccentric force on the steel bar head, and reducing the tensile strength of the steel bar. Summary of the Utility Model

[0008] The present utility model provides an encircling chuck, a sleeve assembly and a precast member, which can restrict the prestressed steel bar from slipping laterally into the side opening of the chuck, greatly reduce the eccentric force on the prestressed steel bar, and improve the tensile strength of the prestressed steel bar.

[0009] To solve the above problems, the present utility model adopts the following technical solutions:

[0010] According to the first aspect of the present utility model, an embodiment of the present utility model provides an encircling chuck, including a chuck body. A through hole is provided on the top surface of the chuck body, a side opening communicating with the through hole is provided on the side surface of the chuck body, and a limiting structure is provided on the top surface of the chuck body for restricting the prestressed steel bar inserted in the through hole from moving towards the side opening.

[0011] In some embodiments, the limiting structure is a clamping ring arranged around the through hole, and the clamping ring is provided with a notch corresponding to the side opening.

[0012] In some embodiments, the height of the clamping ring is greater than the height of the upset head of the prestressed steel bar.

[0013] In some embodiments, the top surface of the chuck body is arc-shaped or frustum-shaped.

[0014] According to the second aspect of the present utility model, an embodiment of the present utility model provides a sleeve assembly, including a sleeve and the encircling chuck according to any one of the above first aspects. The sleeve is sleeved outside the encircling chuck, and an internal thread for connecting with a tensioning screw and a blocking structure are provided on the inner wall of the sleeve; in the tensioning direction, the blocking structure and the internal thread are sequentially distributed, and the chuck body and the limiting structure are sequentially distributed; the blocking structure is used for restricting the encircling chuck from disengaging from the sleeve in the direction opposite to the tensioning direction.

[0015] In some embodiments, the blocking structure is a convex ring protruding from the inner wall of the sleeve, and the convex ring abuts against the chuck body.

[0016] According to the third aspect of the present utility model, an embodiment of the present utility model provides a precast member, including a pile body and the sleeve assembly according to any one of the above second aspects. The sleeve assembly is fixed at the end of the pile body, prestressed steel bars are buried in the pile body, the prestressed steel bars are inserted in the through holes, and the upset heads of the prestressed steel bars are located on one side of the chuck body provided with the limiting structure.

[0017] In some embodiments, an end plate is provided on the end face of the pile body, the end plate is provided with a through end plate opening, the sleeve is inserted in the end plate opening, and the sleeve is connected to the end plate.

[0018] In some embodiments, the sleeve is fixedly welded to the end plate; alternatively, the end plate is provided with threaded holes, and an external thread adapted to the threaded holes in the end plate is provided on the outer peripheral surface of the sleeve, and the sleeve is threadedly connected to the threaded holes in the end plate; alternatively, a limiting ring is provided on the outer peripheral surface of the sleeve, and an elastic snap ring is sleeved on one end of the sleeve close to the end plate, and the limiting ring and the elastic snap ring clamp the end plate.

[0019] In some embodiments, it further includes a tensioning plate and tensioning screws. The tensioning plate is provided with a through tensioning plate perforation, and the tensioning screws pass through the tensioning plate perforation and are threadedly connected to the sleeve.

[0020] The utility model has at least the following beneficial effects: The utility model is provided with a limiting structure on the top surface of the block body. The limiting structure is used to limit the prestressed steel bar penetrating through the perforation from moving towards the side opening, making it difficult for the prestressed steel bar as a whole to slide and tilt towards the side opening, greatly reducing the eccentric force on the prestressed steel bar and enhancing the tensile strength of the prestressed steel bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embracing type block according to an embodiment of the utility model;

[0022] Figure 2 It is a schematic structural diagram of an embracing type block according to an embodiment of the utility model from another perspective;

[0023] Figure 3 It is a schematic cross-sectional view of a sleeve assembly according to an embodiment of the utility model;

[0024] Figure 4 It is a schematic cross-sectional view of a precast member according to an embodiment of the utility model;

[0025] Figure 5 It is a schematic cross-sectional view of a precast member according to another embodiment of the utility model;

[0026] Figure 6 It is a schematic structural diagram of an end plate according to an embodiment of the utility model;

[0027] Figure 7 It is a schematic cross-sectional view of the connection between a sleeve and an end plate according to an embodiment of the utility model;

[0028] Figure 8 It is a schematic structural diagram of an elastic snap ring according to an embodiment of the utility model;

[0029] Figure 9 It is a schematic cross-sectional view of a precast member according to yet another embodiment of the utility model;

[0030] Figure 10 It is a schematic structural diagram of a tensioning plate according to an embodiment of the utility model;

[0031] Figure 11 The present invention is a cross-sectional schematic diagram of a prefabricated component according to another embodiment of the present invention.

[0032] Wherein, the accompanying drawings are marked as follows:

[0033] The block body 100, the through hole 110, the side opening 120, the limiting structure 130, the notch 140, and the force-bearing surface 150;

[0034] Sleeve 200, internal thread 210, blocking structure 220, limiting ring 230, elastic snap ring 240, notch 241, annular groove 250;

[0035] Pile body 300, prestressed steel bar 310, pier head 311, spiral stirrup 320,

[0036] End plate 400, end plate opening 410;

[0037] Pile collar 500;

[0038] Tensioning plate 600 , tensioning plate through-hole 601 , tensioning screw 610 . DETAILED DESCRIPTION

[0039] The utility model provides the following description with reference to the accompanying drawings to help fully understand the various embodiments of the utility model as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the utility model.

[0040] In the description of the present invention, descriptions of orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] It will be understood that when one element (eg, a first element) is “connected” to another element (eg, a second element), the element may be directly connected to the other element or an intervening element (eg, a third element) may be present between the element and the other element.

[0042] The embodiment of the utility model provides an embracing card block, such as Figure 1 and Figure 2As shown, it includes a chuck body 100. A through perforation 110 is provided on the top surface of the chuck body 100 for the prestressed steel bar to pass through. Specifically, the prestressed steel bar can pass downward through the perforation 110 from the top of the chuck body 100. The end of the prestressed steel bar forms a button head. The diameter of the perforation 110 can be slightly larger than the outer diameter of the prestressed steel bar, and the diameter of the perforation 110 is smaller than the outer diameter of the button head, so that the button head cannot pass through the perforation 110. A side opening 120 communicating with the perforation 110 is provided on the side surface of the chuck body 100. The prestressed steel bar can be inserted into the perforation 110 radially from the side opening 120, which eliminates the need to insert the prestressed steel bar into the perforation 110 from the end, facilitating the quick connection between the prestressed steel bar and the chuck body 100. A limiting structure 130 is provided on the top surface of the chuck body 100. The limiting structure 130 is used to limit the movement of the prestressed steel bar inserted in the perforation 110 towards the side opening 120. This makes it difficult for the entire prestressed steel bar to slip and tilt towards the side opening 120, greatly reducing the eccentric force on the prestressed steel bar, and thus enhancing the tensile strength of the prestressed steel bar.

[0043] In some embodiments, the limiting structure 130 is a snap ring arranged around the perforation 110. The snap ring encloses to form a receiving groove. At least a part of the button head of the prestressed steel bar is embedded in the receiving groove. The snap ring plays a limiting role on the button head, thereby restricting the movement of the prestressed steel bar towards the side opening 120. The snap ring is provided with a notch 140 corresponding to the side opening 120. The prestressed steel bar can pass through the side opening 120 and the notch 140 radially to be inserted into the perforation 110.

[0044] Furthermore, the height of the snap ring is greater than the height of the button head of the prestressed steel bar, which enables the button head to be completely embedded in the receiving groove formed by the snap ring enclosure, providing a better limiting effect on the button head and making it less likely for the prestressed steel bar to move towards the side opening 120.

[0045] Furthermore, the width of the side opening 120 can be equal to or slightly smaller than the diameter of the perforation 110, and the width of the notch 140 can be equal to the width of the side opening 120.

[0046] In this embodiment, the snap ring can be provided on the periphery of the top surface of the chuck body 100 to increase the inner diameter of the snap ring and better accommodate the button head. The snap ring can be integrally formed with the chuck body 100 for easy overall manufacturing. The outer peripheral wall of the snap ring can be flush with the outer peripheral wall of the chuck body 100, making the outer peripheral wall of the integral snap ring chuck relatively flat and facilitating insertion into the sleeve.

[0047] In some embodiments, the top surface of the chuck body 100 is arc-shaped or frustum-shaped, which is adapted to the shape of the bottom surface of the button head. During prestress tensioning, the bottom surface of the button head will closely adhere to the top surface of the chuck body 100, and the prestressed steel bar is not likely to be displaced, improving the tensioning effect on the prestressed steel bar.

[0048] An embodiment of the present utility model provides a sleeve assembly, as Figure 3 shown, which includes a sleeve 200 and the circumferential clamping block of any of the above embodiments. For the specific structure of the circumferential clamping block, reference can be made to the above embodiments and will not be elaborated here. The sleeve 200 is sleeved outside the circumferential clamping block. An internal thread 210 and a blocking structure 220 for connecting with a tensioning screw are arranged on the inner wall of the sleeve 200. In the tensioning direction, the blocking structure 220 and the internal thread 210 are sequentially distributed, and the clamping block body 100 and the limiting structure 130 are sequentially distributed. The blocking structure 220 is used to limit the circumferential clamping block from disengaging from the sleeve 200 in the direction opposite to the tensioning direction, and thus can provide a tensile force to the prestressed steel bar 310 in the tensioning direction. During assembly, the circumferential clamping block can be inserted into the sleeve 200 in the direction opposite to the tensioning direction until it contacts the blocking structure 220.

[0049] In some embodiments, the blocking structure 220 is a convex ring protruding from the inner wall of the sleeve 200, and the convex ring abuts against the clamping block body 100, which can limit the circumferential clamping block from disengaging from the sleeve 200 in the direction opposite to the tensioning direction.

[0050] Furthermore, as Figure 2 and Figure 3 shown, the end face of the convex ring close to the clamping block body 100 can be set as a frustum of a cone, and the stress surface 150 of the bottom surface of the clamping block body 100 is also set as a frustum of a cone adapted to the end face of the convex ring close to the clamping block body 100. The stress surface 150 can closely adhere to the end face of the convex ring close to the clamping block body 100, and play a guiding and limiting role on the clamping block body 100, so that it can maintain a centered position and ensure the coaxiality of the tensioning screw and the prestressed steel bar 310.

[0051] An embodiment of the present utility model provides a precast component, as Figure 3 and Figure 4 shown, which includes a pile body 300 and the sleeve assembly of any of the above embodiments. For the specific description of the sleeve assembly, reference can be made to the above embodiments and will not be elaborated here. The sleeve assembly is fixed at the end of the pile body 300. A prestressed steel bar 310 is buried in the pile body 300, and the prestressed steel bar 310 passes through the through hole of the clamping block body 100. The upset head 311 of the prestressed steel bar 310 is located on the side of the clamping block body 100 where the limiting structure 130 is provided.

[0052] During tensioning, the limiting structure 130 can limit the prestressed steel bar 310 from moving towards the side opening, and ensure the coaxiality of the tensioning screw and the prestressed steel bar 310. At the same time, the precast component of this embodiment can be directly connected to the tensioning screw without using an end plate, thereby reducing the production cost of the precast component.

[0053] In some embodiments, spiral stirrups 320 are embedded in the pile body 300 , and the spiral stirrups 320 are wound around the prestressed steel bars 310 to form a steel cage.

[0054] In some embodiments, the sleeve 200 may be embedded in the concrete of the pile body 300 when the pile body is formed.

[0055] The utility model also provides another embodiment of the prefabricated component, such as Figure 5 and Figure 6 As shown, compared with the prefabricated components of the above-mentioned embodiment, the present embodiment is provided with an end plate 400 at the end face of the pile body 300, and the end plate 400 is provided with a through end plate opening 410, and the sleeve 200 is penetrated in the end plate opening 410, so that the tensioning screw can pass through the end plate opening 410 and then connect with the sleeve 200. At the same time, the sleeve 200 is connected to the end plate 400. The prefabricated component of the present embodiment includes the end plate 400, but due to the presence of the embracing clamping block, the coaxiality of the tensioning screw and the prestressed steel bar 310 can be guaranteed, thereby improving the flatness of the end plate 400.

[0056] Regarding the connection method between the sleeve 200 and the end plate 400, the following embodiments are provided:

[0057] In one embodiment, the sleeve 200 is welded to the end plate 400. Specifically, the outer peripheral surface of the sleeve 200 is welded to the inner wall of the end plate opening 410, or the outer peripheral surface of the sleeve 200 is welded to the end surface of the end plate 400 close to the pile body 300.

[0058] In another embodiment, the end plate opening 410 is a threaded hole, and the outer peripheral surface of the sleeve 200 is provided with an external thread that is compatible with the end plate opening 410. The sleeve 200 is threadedly connected to the end plate opening 410. The threaded connection eliminates the on-site welding construction process, is simple to operate, and is easy to connect.

[0059] In yet another embodiment, Figure 7 As shown, a limiting ring 230 is provided on the outer circumference of the sleeve 200, and an elastic snap ring 240 is sleeved on one end of the sleeve 200 close to the end plate 400. The limiting ring 230 and the elastic snap ring 240 clamp the end plate 400, thereby connecting and fixing the sleeve 200 to the end plate 400.

[0060] The use of the elastic snap ring 240 can facilitate the installation of the elastic snap ring 240, such as Figure 8 As shown, the elastic snap ring 240 has a notch 241 , which makes the elastic snap ring 240 more elastic.

[0061] An annular groove 250 may be provided on the outer peripheral surface of one end of the sleeve 200 close to the end plate 400, and a portion of the elastic retaining ring 240 is inserted into the annular groove 250 to limit the axial movement of the elastic retaining ring 240 relative to the sleeve 200 along the sleeve 200. The limiting ring 230 and the elastic retaining ring 240 can stably clamp the end plate 400.

[0062] The limiting ring 230 may be a ring structure protruding from the outer circumference of the sleeve 200 , and may be fixed to the outer circumference of the sleeve 200 , or may be integrally formed with the sleeve 200 .

[0063] In some embodiments, a pile collar 500 is sleeved on the circumference of the end of the pile body 300 , which can be used for pile connection and can also enhance the structural strength of the end of the pile body 300 .

[0064] In some embodiments, Figure 9 and Figure 10 As shown, for a prefabricated component without an end plate, the prefabricated component further includes a tensioning plate 600 and a tensioning screw 610. The tensioning plate 600 is provided with a tensioning plate through hole 601, and the tensioning screw 610 passes through the tensioning plate through hole 601 and is threadedly connected with the sleeve 200. When tensioning, the tensioning plate 600 drives the tensioning screw 610, and the tensioning screw 610 drives the sleeve 200, and the encircling clamping block in the sleeve 200 pulls the pier head 311, thereby prestressing the prestressed steel bar 310.

[0065] In other embodiments, Figure 11 As shown, for a prefabricated component with an end plate, the prefabricated component further includes a tensioning plate 600 and a tensioning screw 610. The tensioning plate 600 is arranged on the outside of the end plate 400. The tensioning plate 600 is provided with a through tensioning plate through hole 601. The tensioning screw 610 passes through the tensioning plate through hole 601 and is threadedly connected with the sleeve 200. When tensioning, the tensioning plate 600 drives the tensioning screw 610, and the tensioning screw 610 drives the sleeve 200. The encircling clamping block in the sleeve 200 pulls the pier head 311, thereby prestressing the prestressed steel bar 310.

[0066] The terms and words used in the above description and claims are not limited to the literal meanings, but are only used by the applicant to enable a clear and consistent understanding of the utility model. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the utility model is provided only for illustration, and not for limiting the utility model as defined by the attached claims and their equivalents.

Claims

1. An encircling clamping block, characterized in that: It includes a clamping block body. A through perforation is provided on the top surface of the clamping block body. A side opening communicating with the perforation is provided on the side surface of the clamping block body. A limiting structure is provided on the top surface of the clamping block body, and the limiting structure is used to limit the movement of the prestressed steel bar passing through the perforation towards the side opening.

2. The enveloping card block according to claim 1, characterized in that: The limiting structure is a clamping ring arranged around the perforation, and the clamping ring is provided with a notch corresponding to the side opening.

3. The embracing card block according to claim 2, characterized in that: The height of the clamping ring is greater than the height of the upset head of the prestressed steel bar.

4. The embracing card block according to claim 1, characterized in that: The top surface of the clamping block body is arc-shaped or frustum-shaped.

5. A sleeve assembly, characterized in that: It includes a sleeve and the surrounding clamping block as described in any one of claims 1-4. The sleeve is sleeved on the outside of the surrounding clamping block. An internal thread for connecting with a tensioning screw and a blocking structure are provided on the inner wall of the sleeve; in the tensioning direction, the blocking structure and the internal thread are sequentially distributed, and the clamping block body and the limiting structure are sequentially distributed; the blocking structure is used to limit the surrounding clamping block from disengaging from the sleeve in the direction opposite to the tensioning direction.

6. The sleeve assembly according to claim 5, wherein: The blocking structure is a convex ring protruding from the inner wall of the sleeve, and the convex ring abuts against the clamping block body.

7. A precast component, characterized in that: It includes a pile body and the sleeve assembly as described in claim 5 or 6. The sleeve assembly is fixed at the end of the pile body. A prestressed steel bar is embedded in the pile body, and the prestressed steel bar passes through the perforation. The upset head of the prestressed steel bar is located on the side of the clamping block body where the limiting structure is provided.

8. The precast member according to claim 7, characterized in that: An end plate is provided on the end face of the pile body. The end plate is provided with a through end plate opening. The sleeve passes through the end plate opening and is connected to the end plate.

9. The precast member according to claim 8, wherein: The sleeve is fixedly welded to the end plate; Or, the end plate opening is a threaded hole, and an external thread adapted to the end plate opening is provided on the outer peripheral surface of the sleeve. The sleeve is threadedly connected to the end plate opening; Or, a limiting ring is provided on the outer peripheral surface of the sleeve, and an elastic clamping ring is sleeved on one end of the sleeve close to the end plate. The limiting ring and the elastic clamping ring clamp the end plate.

10. The precast member according to any one of claims 7-9, characterized in that: It further includes a tensioning plate and a tensioning screw. The tensioning plate is provided with a through tensioning plate perforation. The tensioning screw passes through the tensioning plate perforation and is threadedly connected to the sleeve.

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