Prestress tensioning jack head

Abstract

The utility model provides a pre-stress tensioning jack plug, which relates to the technical field of pre-stress tensioning equipment and comprises a single-hole tensioning plug, the single-hole tensioning plug is provided with a first stepped hole, a second stepped hole, a through hole and a third stepped hole, a connector of a single-hole jack can be inserted into the third stepped hole, a single-hole anchorage device can be inserted into the first stepped hole, and the single-hole anchorage device can be inserted into the second stepped hole. The single-hole anchorage device sinks inwards to form a mounting hole, a clamping piece is arranged in the mounting hole, one part of the clamping piece is inserted into the mounting hole, and the other part of the clamping piece is located in the second step hole; the single-hole anchorage device, the clamping piece and the connector are coaxial, and the steel strand sequentially penetrates through the single-hole anchorage device, the clamping piece, the through hole and the connector and is fixedly connected with the output end of the single-hole jack. The single-hole anchorage device, the clamping piece and the connector are coaxial through the first stepped hole, the second stepped hole and the third stepped hole in the single-hole tensioning plug, shaking is not prone to being generated in the tensioning process, the tensioning plug, the single-hole anchorage device and the jack can be jointly positioned, and manual positioning is not needed in the tensioning process.

Description

Technical Field

[0001] The utility model relates to the technical field of prestressed tensioning equipment, in particular to a prestressed tensioning jack head. Background Art

[0002] Prestressed tensioning structures are widely used in projects such as bridges, precast concrete structures, and flexible photovoltaics. Hydraulic jacks and tensioning heads are required during prestressed tensioning.

[0003] During the stress tensioning of existing flexible photovoltaic brackets, single-hole anchors, single-hole heads, and single-hole through-hole hydraulic jacks are required, and the following problems exist:

[0004] 1. The tensioning head directly abuts against the end face of the single-hole anchor, and the contact area is small. During the tensioning process, it is easy to shake up and down, which easily causes uneven stress on the wedge grips and damage.

[0005] 2. There is no positioning structure between the tensioning head and the single-hole anchor, nor between the tensioning head and the jack. Workers need to position the jack manually to prevent the jack from sagging and causing the head to fail to tightly abut against the single-hole anchor.

[0006] In view of this, how to provide a prestressed tensioning jack head that can avoid shaking up and down and has mechanical positioning is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a prestressed tensioning jack head to solve the problems existing in the prior art.

[0008] To achieve the above purpose, the utility model provides the following solution: The utility model provides a prestressed tensioning jack head, including:

[0009] A single-hole tensioning head, which sequentially defines a first stepped hole, a second stepped hole, a through hole, and a third stepped hole along the length direction;

[0010] The single-hole jack has a connecting head, the third stepped hole is adapted to the shape of the connecting head, and the connecting head can be inserted into the third stepped hole;

[0011] The first stepped hole is adapted to the shape of one end of the single-hole anchor, and one end of the single-hole anchor can be inserted into the first stepped hole, and the other end of the single-hole anchor is fixed on the tensioning top plate;

[0012] One end of the single-hole anchor is recessed inward to form a mounting hole, and a wedge is arranged in the mounting hole. A part of the wedge is inserted into the mounting hole, and the other part is located in the second stepped hole; the single-hole anchor, the wedge and the connector are coaxial. The steel strand passes through the single-hole anchor, the wedge, the through hole and the connector in sequence and is fixedly connected to the output end of the single-hole jack. The wedge clamps the steel strand, and the single-hole jack can tension the steel strand in a direction away from the third stepped hole.

[0013] Further, the mounting hole is a tapered hole, and the narrower end of the mounting hole is close to the tensioning top plate. The wedge is tapered. When the wedge moves into the mounting hole, the hole wall of the mounting hole presses the wedge inward, and the wedge clamps the steel strand.

[0014] Further, the inner diameter of the first stepped hole is greater than the outer diameter of the single-hole anchor, and the depth of the first stepped hole is less than the length of the single-hole anchor.

[0015] Further, the inner diameter of the second stepped hole is greater than the outer diameter of the wedge.

[0016] Further, the third stepped hole has an internal thread, the depth of the third stepped hole is greater than the length of the connector, and the third stepped hole is threadedly connected to the connector.

[0017] Further, the outer diameter of the through hole is greater than the outer diameter of the steel strand.

[0018] The present utility model discloses the following technical effects:

[0019] 1. The first stepped hole, the second stepped hole and the third stepped hole in the single-hole tensioning head make the single-hole anchor, the wedge and the connector coaxial. During the tensioning process, it is not easy to generate shaking and can jointly position the tensioning head, the single-hole anchor and the jack, and manual positioning is no longer required during tensioning.

[0020] 2. The wedge is designed to be tapered, and a tapered mounting hole is arranged in the single-hole anchor. During tensioning, the wedge is driven by the steel strand to move away from the mounting hole until it contacts the bottom surface of the second stepped hole. The wedge is in an open state, and the steel strand can pass through the wedge smoothly; after tensioning to the preset value, the steel strand naturally retracts, which can drive the wedge to move towards the mounting hole. As the depth of the wedge entering the mounting hole becomes deeper and deeper, the inner side wall of the mounting hole presses the wedge inward, and the wedge tightly clamps the steel strand. When the mounting hole presses the wedge, it uniformly squeezes the wedge from the outside to the inside, and the wedge is uniformly stressed, and the tooth pattern on the inner surface of the wedge will not damage the steel strand. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall installation structure;

[0023] Figure 2 It is a structural disassembly diagram;

[0024] Figure 3 It is Figure 1 a front sectional view of

[0025] Figure 4 a sectional view of the single-hole tension head;

[0026] Among them, 1 is the single-hole tension head; 101 is the first stepped hole; 102 is the second stepped hole; 103 is the third stepped hole; 104 is the through hole; 2 is the single-hole jack; 201 is the connector; 3 is the single-hole anchor; 301 is the installation hole; 4 is the wedge; 5 is the steel strand; 6 is the tension top plate. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0029] This embodiment provides a prestressed tension jack head, including: a single-hole tension head 1, the single-hole tension head 1 sequentially defining a first stepped hole 101, a second stepped hole 102, a through hole 104, and a third stepped hole 103 along the length direction; the single-hole jack 2 has a connection head 201, the third stepped hole 103 is adapted to the shape of the connection head 201, and the connection head 201 can be inserted into the third stepped hole 103; the first stepped hole 101 is adapted to the shape of one end of the single-hole anchor 3, and its outer surface expands outward to form a funnel-shaped connection part, and one end of the single-hole anchor 3 can be inserted into the first stepped hole 101 through the connection part, improving the connection convenience. The other end of the single-hole anchor 3 is fixed on the tensioning top plate 6; one end of the single-hole anchor 3 is recessed inward to form a mounting hole 301, a wedge 4 is arranged in the mounting hole 301, a part of the wedge 4 is inserted into the mounting hole 301, and the other part is located in the second stepped hole 102; the single-hole anchor 3, the wedge 4, and the connection head 201 are coaxial, the steel strand 5 sequentially passes through the single-hole anchor 3, the wedge 4, the through hole 104, and the connection head 201 and is fixedly connected to the output end of the single-hole jack 2, the wedge 4 clamps on the steel strand 5, and the single-hole jack 2 can tension the steel strand 5 in a direction away from the third stepped hole 103.

[0030] In this embodiment, the mounting hole 301 is a tapered hole, the narrower end of the mounting hole 301 is close to the tensioning top plate 6, the wedge 4 is tapered, when the wedge 4 moves into the mounting hole 301, the hole wall of the mounting hole 301 presses the wedge 4 inward, and the wedge 4 clamps the steel strand 5.

[0031] In this embodiment, the inner diameter of the first stepped hole 101 is larger than the outer diameter of the single-hole anchor 3, and the depth of the first stepped hole 101 is smaller than the length of the single-hole anchor 3. The inner diameter of the second stepped hole 102 is larger than the outer diameter of the wedge 4. The third stepped hole 103 has an internal thread, the depth of the third stepped hole 103 is larger than the length of the connection head 201, and the third stepped hole 103 is threadedly connected to the connection head 201. The outer diameter of the through hole 104 is larger than the outer diameter of the steel strand 5.

[0032] The specific working process is as follows:

[0033] Threadedly connect the connection head 201 of the single-hole jack 2 with the third stepped hole 103 of the single-hole tension head 1, pass the single-hole anchor 3 through the steel strand 5, and fix the single-hole anchor 3 on the tensioning top plate 6. The tensioning top plate 6 is a fixed part and remains stationary during the prestressed tensioning process. Clamp the wedge 4 on the steel strand 5 and insert it into the mounting hole 301 of the single-hole anchor 3, and then jointly install the single-hole anchor 3 and the wedge 4 into the first stepped hole 101 and the second stepped hole 102 of the single-hole tension head 1. Pass the steel strand 5 through the inner hole of the single-hole jack 2 and fix the steel strand 5 to the output end of the single-hole jack 2.

[0034] Start the single-hole jack 2. The jack pulls the steel strand 5 in the direction away from the third stepped hole 103. At this time, the wedge grip 4 clamps on the steel strand 5, but the clamping force is very small (the wedge grip 4 can move along with the steel strand 5. When the wedge grip 4 contacts the bottom surface of the second stepped hole 102, the steel strand 5 separates from the wedge grip 4). The steel strand 5 drives the wedge grip 4 to move towards the second stepped hole 102 until the wedge grip 4 contacts the bottom surface of the second stepped hole 102. Since the clamping force of the wedge grip 4 is very small, the steel strand 5 can smoothly move through the inner hole of the wedge grip 4. By outward tensioning with the single-hole jack 2, the wedge grip 4 causes no wear or minimal wear to the steel strand 5.

[0035] When the steel strand 5 reaches the preset tension value, the single-hole jack 2 slowly retracts. The steel strand 5 starts to retract (retract towards the tensioning roof plate 6). The steel strand 5 drives the wedge grip 4 to move towards the installation hole 301. During the movement, the wedge grip 4 gradually enters the installation hole 301. The tapered surface of the installation hole 301 is narrow. As the wedge grip 4 enters deeper and deeper, it can gradually press the wedge grip 4 inward, causing the wedge grip 4 to clamp the steel strand 5 tightly. During the pressing process of the wedge grip 4, the force is evenly distributed, and its internal tooth pattern will not damage the steel strand 5, which can improve the structural stability and avoid anchor detachment.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0037] The embodiments described above are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A prestressed tensioning jack head, characterized in that: include: A single-hole tensioning plug (1), wherein the single-hole tensioning plug (1) defines a first step hole (101), a second step hole (102), a through hole (104), and a third step hole (103) in sequence along a length direction; The single-hole jack (2) has a connecting head (201), the third step hole (103) is adapted in shape to the connecting head (201), and the connecting head (201) can be inserted into the third step hole (103); The first step hole (101) is adapted in shape to one end of the single-hole anchor (3); one end of the single-hole anchor (3) can be inserted into the first step hole (101); and the other end of the single-hole anchor (3) is fixed on the tensioning top plate (6); One end of the single-hole anchor (3) is recessed inward to form a mounting hole (301), and a clip (4) is provided in the mounting hole (301), a portion of the clip (4) is inserted into the mounting hole (301), and the other portion is located in the second step hole (102); the single-hole anchor (3), the clip (4) and the connector (201) are coaxial, and one end of the steel strand (5) passes through the single-hole anchor (3), the clip (4), the through hole (104) and the connector (201) in sequence and is fixedly connected to the output end of the single-hole jack (2), the clip (4) is clamped on the steel strand (5), and the single-hole jack (2) can tension the steel strand (5) in a direction away from the third step hole (103).

2. A prestressed tensioning jack head according to claim 1, characterized in that: The mounting hole (301) is a conical hole, and the narrower end of the mounting hole (301) is close to the tensioning top plate (6). The clamp (4) is conical. When the clamp (4) moves into the mounting hole (301), the hole wall of the mounting hole (301) presses the clamp (4) inwardly, and the clamp (4) clamps the steel strand (5).

3. A prestressed tensioning jack head according to claim 2, characterized in that: The inner diameter of the first step hole (101) is greater than the outer diameter of the single-hole anchor (3), and the depth of the first step hole (101) is less than the length of the single-hole anchor (3).

4. A prestressed tensioning jack head according to claim 2, characterized in that: The inner diameter of the second stepped hole (102) is greater than the outer diameter of the clip (4).

5. A prestressed tensioning jack head according to claim 2, characterized in that: The third step hole (103) has an internal thread, the depth of the third step hole (103) is greater than the length of the connecting head (201), and the third step hole (103) is threadedly connected to the connecting head (201).

6. A prestressed tensioning jack head according to claim 1, characterized in that: The outer diameter of the through hole (104) is greater than the outer diameter of the steel strand (5).

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