Auxiliary device for bridge plate prestressed steel strand tensioning construction

Abstract

The utility model relates to an auxiliary device for bridge plate prestressed steel strand tensioning construction, which comprises a shell and a plurality of jackets, each jacket is of a conical structure formed by three clamping pieces, and the shell is provided with a plurality of first through holes in one-to-one correspondence with the jackets; the center of the shell is rotationally matched with a rotating disc, a plurality of first extrusion parts annularly and evenly distributed with the shell as the axis are arranged on the arc-shaped face of the rotating disc, and the first through holes are all located on the rotating tracks of the first extrusion parts. Before the steel strands and the steel strand tensioning anchorage device are installed, an operator presets the clamping sleeves on the shell and fixes the clamping sleeves by rotating the rotating disc, then the multiple steel strands penetrate through the clamping sleeves, and the operator moves the shell to enable the shell to be close to the anchor plate till the clamping sleeves are inserted into the anchor plate; and the clamping sleeve is separated from the fixed connection with the first extrusion part by rotating the turntable, and at the moment, the clamping pieces are naturally kept in a gathering state through the taper hole of the anchor plate, so that the shell can be recovered by returning along the original path.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to an auxiliary device for the tensioning construction of prestressed steel strands of bridge slabs. Background Art

[0002] The steel strand tensioning anchor for bridge construction includes an anchor plate and a collet. The collet is generally a conical structure formed by splicing three wedge-shaped pieces. The steel strand passes through the collet and the conical hole of the anchor plate. When the steel strand is stressed and tightened, the collet is closely attached to the conical hole of the anchor plate, thereby ensuring the tensioning stability of the bridge.

[0003] However, during the construction process, when installing the steel strand tensioning anchor, the steel strand is inserted into the conical hole of the anchor plate manually, and then the wedge-shaped pieces are inserted into each conical hole one by one to clamp the steel strand, so as to press the steel strand through the anti-slip pattern on the inner wall of the wedge-shaped piece.

[0004] In the above operation process, since the operator needs to manually insert multiple wedge-shaped pieces into each conical hole in sequence, it takes a lot of time. If the installation of the steel strand tensioning anchor is not completed for a long time, it is easy for the steel strand to lose the ability to restore its normal wire diameter. If the tension of the steel strand increases instantaneously at this time, the phenomenon of "wire slipping" will occur, causing the steel strand to break away from the tensioning anchor, thus greatly affecting the stress stability of the bridge. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide an auxiliary device for the tensioning construction of prestressed steel strands of bridge slabs, so as to solve the problem that if the installation of the steel strand tensioning anchor is not completed for a long time in the prior art, it is easy for the steel strand to lose the ability to restore its normal wire diameter, and if the tension of the steel strand increases instantaneously at this time, the phenomenon of "wire slipping" will occur.

[0006] The utility model is realized through the following technical solutions:

[0007] An auxiliary device for the tensioning construction of prestressed steel strands of bridge slabs includes a housing and a plurality of collets annularly and evenly distributed with the housing as the center. The collet is a conical structure composed of three wedge-shaped pieces. A plurality of first through holes corresponding to the plurality of collets one by one are opened on the housing, and the first through holes are used for the collets to pass through;

[0008] A turntable is rotationally matched at the center of the housing. A plurality of first pressing parts annularly and evenly distributed with the housing as the center are arranged on the arc surface of the turntable. All the plurality of first through holes are located on the rotation trajectories of the first pressing parts, and the plurality of first pressing parts can be rotated to be opposite to the plurality of first through holes one by one.

[0009] Further, a convex part is arranged at the tail end of the wedge-shaped piece, and the convex part extends along the thickness direction of the wedge-shaped piece;

[0010] The first extrusion part can rotate between the convex part and the first through hole.

[0011] Furthermore, the housing includes a mounting shell and a baffle. The baffle is connected to one side of the mounting shell, and an installation cavity for mounting the turntable is formed between the two. The installation cavity is communicated with the first through hole. The tail end of the jacket can be inserted into the installation cavity through the first through hole and abuts against the baffle.

[0012] Furthermore, a second through hole communicated with the installation cavity is formed in the baffle.

[0013] It further includes a movable plate. A plurality of insertion blocks corresponding to the plurality of jackets one by one are arranged on one side of the movable plate. The insertion blocks can be inserted into the installation cavity through the second through hole and abut against the inner wall of the jacket. The insertion blocks are frustum-shaped.

[0014] Furthermore, a rotating ring capable of rotating coaxially with the turntable is arranged on the mounting shell. The first through hole is located between the rotating ring and the turntable.

[0015] A plurality of second extrusion parts annularly and evenly distributed with the mounting shell as the axis are arranged on the inner arc surface of the rotating ring. All the first through holes are located on the rotation trajectories of the second extrusion parts. The plurality of second extrusion parts can rotate to be opposite to the plurality of first through holes one by one.

[0016] The second extrusion part can rotate between the convex part and the first through hole.

[0017] Furthermore, an annular chute is arranged on the inner wall of the installation cavity, and a sliding block slidably matched with the chute is arranged on the rotating ring.

[0018] Furthermore, a first handle and a second handle for facilitating the operator to dial are respectively arranged on the turntable and the rotating ring.

[0019] Furthermore, one end of the first handle is coaxially connected to the turntable, and the other end penetrates through the baffle and extends to the outside.

[0020] Furthermore, a pointing block is arranged at the end of the first handle away from the baffle. One end of the pointing block is a tip, and the tip faces one of the first extrusion parts.

[0021] Furthermore, one end of the second handle is connected to the outer arc surface of the rotating ring, and the other end penetrates through the mounting shell and extends to the outside. The second handle faces one of the second extrusion parts.

[0022] An arc-shaped groove communicated with the installation cavity is formed on the outer arc surface of the mounting shell. The second handle is slidably matched with the arc-shaped groove.

[0023] The beneficial effects of the present utility model are as follows:

[0024] Before installing the steel strand and the tensioning anchor for the steel strand, the operator preset the jacket on the housing and fixed it by rotating the turntable. Then, multiple steel strands were passed through each jacket, and the operator moved the housing to make the housing approach the anchor plate until the jacket was inserted into the anchor plate. By rotating the turntable, the jacket was disengaged from the fixed connection with the first extrusion part. At this time, the clamping pieces naturally remained in a gathered state through the tapered hole of the anchor plate, and the housing could be recovered by returning along the original path.

[0025] Other advantages, objectives, and features of the present utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the following description. Brief Description of the Drawings

[0026] Figure 1 is a three-dimensional structural schematic diagram when the present utility model is applied;

[0027] Figure 2 is an internal structural schematic diagram (first view) of the housing of the present utility model;

[0028] Figure 3 is an internal structural schematic diagram (second view) of the housing of the present utility model;

[0029] Figure 4 is a structural schematic diagram of the application of the housing and the movable plate of the present utility model.

[0030] In the figure:

[0031] 1. Clamping piece; 101. Protruding part; 2. First through hole; 3. Turntable; 301. First extrusion part; 4. Installation housing; 401. Baffle; 5. Second through hole; 6. Movable plate; 601. Insert block; 7. Rotating ring; 701. Second extrusion part; 8. Chute; 801. Slide block; 9. First handle; 901. Pointing block; 10. Second handle; 11. Arc groove. Detailed Description of the Embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0035] In the above description of the present invention, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is habitually placed during use. It is only for the convenience of describing the present invention and simplifying the description, 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, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0036] In addition, terms such as "the same" do not mean that the components are required to be absolutely the same, but there may be slight differences. The term "perpendicular" only means that the positional relationship between components is more perpendicular relative to "parallel", and does not mean that the structure must be completely perpendicular, but can be slightly inclined.

[0037] Please refer to Figures 1-4 , the present invention provides a technical solution: an auxiliary device for the tensioning construction of prestressed steel strands of a bridge slab, including a housing and a plurality of clamping sleeves evenly distributed in a ring with the housing as the center. The clamping sleeve is a conical structure composed of three clamping pieces 1. A plurality of first through holes 2 corresponding to the plurality of clamping sleeves one by one are opened on the housing, and the first through holes 2 are used for the clamping sleeves to pass through;

[0038] A turntable 3 is rotatably fitted at the center of the housing. A plurality of first pressing parts 301 evenly distributed in a ring with the housing as the center are arranged on the arc surface of the turntable 3. All the plurality of first through holes 2 are located on the rotation track of the first pressing parts 301, and the plurality of first pressing parts 301 can be opposite to the plurality of first through holes 2 one by one through rotation.

[0039] Among them, by rotating the turntable 3, the first pressing part 301 and the first through hole 2 can be in the following two states:

[0040] State 1: The turntable 3 rotates until the first extrusion part 301 faces the first through hole 2. In this state, the end of the first extrusion part 301 away from the turntable 3 protrudes beyond the coverage range of the first through hole 2;

[0041] State 2: The turntable 3 rotates until the first extrusion part 301 is misaligned with the first through hole 2. In this state, the first extrusion part 301 is located between two adjacent first through holes 2.

[0042] The aperture of the first through hole 2 is larger than the diameter of the end of the jacket, so that the end of the jacket can pass through the first through hole 2. In this state, 1 / 3 of the jacket is located inside the first through hole 2;

[0043] During the specific use process, first rotate the turntable 3 to make the matching state of the first extrusion part 301 and the first through hole 2 reach State 2. In this state, multiple sets of clamping pieces 1 can be inserted into each first through hole 2 in sequence, so that the formed jacket fills the first through holes 2 on the housing. At this time, since the diameter of the formed star-chasing structure of the jacket is smaller than the aperture of the first through hole 2, it is easy to fall out of the first through hole 2 due to looseness.

[0044] Therefore, by rotating the turntable 3, the matching state of the first extrusion part 301 and the first through hole 2 is changed from State 2 to State 1. During this transformation process, as the turntable 3 rotates, the first extrusion part 301 gradually rotates to face the first through hole 2. At the same time, the surface of the first extrusion part 301 away from the turntable 3 gradually abuts against the outer wall of the clamping piece 1 and has an interference fit, so as to squeeze one or two of the clamping pieces 1 through the first extrusion part 301, prompting the three clamping pieces 1 to gather relatively. At the same time, in the gathered state, the clamping pieces 1 are not easily detached from the first through hole 2.

[0045] Thus, after the turntable 3 rotates to make multiple sets of clamping pieces 1 clamp to form a jacket through multiple first extrusion parts 301, multiple steel strands are respectively passed through each jacket. At the same time, the operator moves the housing along the length direction of the steel strand, and at the same time makes the housing close to the anchor plate until the part of the jacket outside the first through hole 2 is inserted into the tapered hole on the anchor plate. The three clamping pieces 1 are kept gathered and clamped by the tapered hole of the anchor plate. At this time, by rotating the turntable 3, the matching state of the first extrusion part 301 and the first through hole 2 is changed from State 1 to State 2, so that the first extrusion part 301 is disengaged from the extrusion relationship with the clamping piece 1. Then the operator removes the housing and makes it move away along the length direction of the steel strand to complete the installation of multiple jackets on the anchor plate.

[0046] In this embodiment: A protrusion 101 is provided at the end of the clamping piece 1, and the protrusion 101 extends along the thickness direction of the clamping piece 1;

[0047] The first extrusion part 301 can rotate between the protrusion 101 and the first through hole 2.

[0048] Among them, the three convex portions 101 can be gathered to form an annular structure with a diameter smaller than the first through hole 2;

[0049] When the rotation of the turntable 3 causes the cooperation state of the first pressing portion 301 and the first through hole 2 to be in the first state, while the first pressing portion 301 presses the clip 1, the first pressing portion 301 is located between the convex portion 101 and the first through hole 2. In this state, if the clip 1 drops towards the outside of the first through hole 2, the convex portion 101 will abut against the first pressing portion 301, thereby blocking the convex portion 101 and the clip 1 and making it not easy to disengage from the first through hole 2.

[0050] In this embodiment: the housing includes a mounting shell 4 and a baffle 401, the baffle 401 is connected to one side of the mounting shell 4, and an installation cavity for mounting the turntable 3 is formed between the two, the installation cavity is communicated with the first through hole 2, and the tail end of the collet can be inserted into the installation cavity through the first through hole 2 and abut against the baffle 401.

[0051] When the tail end of the collet is inserted to the deepest part of the first through hole 2, its tail end is located in the installation cavity, and there is a gap for the first pressing portion 301 to rotate between the convex portion 101 and the inner wall of the installation cavity.

[0052] In this embodiment: a second through hole 5 communicating with the installation cavity is formed on the baffle 401;

[0053] It further includes a movable plate 6, one side of the movable plate 6 is provided with a plurality of insertion blocks 601 corresponding to the plurality of collets one by one, the insertion blocks 601 can be inserted into the installation cavity through the second through hole 5 and abut against the inner wall of the collet, and the insertion blocks 601 are in a frustum shape.

[0054] Among them, the diameter of the annular structure formed by the three convex portions 101 is larger than the aperture of the second through hole 5, and the aperture of the second through hole 5 is larger than the diameter of the insertion block 601;

[0055] During specific use, before inserting the clip 1, the operator inserts the plurality of insertion blocks 601 into the installation cavity through the respective second through holes 5. At the same time, the insertion blocks 601 are coaxial with the first through hole 2. At this time, the operator inserts multiple groups of clips 1 into the first through hole 2 one after another, and the inner wall of the clip 1 abuts against the outer wall of the insertion block 601, making it not easy for the clip 1 to loosen in the first through hole 2 during the insertion process.

[0056] Since the aperture of the first through hole 2 is much larger than a single clip 1, before inserting the third clip 1 into the first through hole 2, the clips 1 in the first through hole 2 are likely to loosen, resulting in the operator needing to adjust the positions of the inserted clips 1 before inserting the third clip 1. By limiting the position of the inserted clip 1 through the insertion block 601, it is not easy to slide in the first through hole 2.

[0057] In this embodiment: A rotating ring 7 that can rotate coaxially with the turntable 3 is further provided on the mounting shell 4, and the first through hole 2 is located between the rotating ring 7 and the turntable 3;

[0058] On the inner arc surface of the rotating ring 7, a plurality of second pressing parts 701 are annularly and evenly distributed with the mounting shell 4 as the axis. All the plurality of first through holes 2 are located on the rotation trajectories of the second pressing parts 701, and the plurality of second pressing parts 701 can rotate to be opposite to the plurality of first through holes 2 one by one;

[0059] The second pressing part 701 can rotate to between the protruding part 101 and the first through hole 2.

[0060] Among them, by rotating the rotating ring 7, the second pressing part 701 and the first through hole 2 can be made to present the following two states:

[0061] State 1: The rotating ring 7 rotates until the second pressing part 701 is opposite to the first through hole 2. In this state, the end of the second pressing part 701 away from the rotating ring 7 protrudes out of the coverage range of the first through hole 2;

[0062] State 2: The rotating ring 7 rotates until the second pressing part 701 is misaligned with the first through hole 2. In this state, the second pressing part 701 is located between two adjacent first through holes 2.

[0063] An operator can rotate the rotating ring 7 to make the cooperation state of the second pressing part 701 and the first through hole 2 be State 1, so that the relative two sides of the clamping sleeve are respectively squeezed by the second pressing part 701 and the first pressing part 301, making the gathering effect of the three clamping pieces 1 better and the friction force received greater, and thus more stable.

[0064] In this embodiment: An annular chute 8 is provided on the inner wall of the installation cavity, and a sliding block 801 that is slidably matched with the chute 8 is provided on the rotating ring 7.

[0065] Through the setting of the chute 8, the rotating ring 7 can rotate along the circumferential direction of the chute 8 in the installation cavity, facilitating the installation of the rotating ring 7 and the stable rotation of the rotating ring 7, and it is not easy to loosen in the installation cavity.

[0066] In this embodiment: A first handle 9 and a second handle 10 that are convenient for an operator to dial are respectively provided on the turntable 3 and the rotating ring 7.

[0067] An operator can rotate the turntable 3 and the rotating ring 7 respectively through the first handle 9 and the second handle 10.

[0068] In this embodiment: One end of the first handle 9 is coaxially connected to the turntable 3, and the other end penetrates through the baffle 401 and extends to the outside.

[0069] In this embodiment: A pointing block 901 is provided at one end of the first handle 9 away from the baffle 401. One end of the pointing block 901 is a tip, and the tip faces one of the first pressing parts 301.

[0070] When the operator needs to rotate the turntable 3, the cooperation state between the first pressing part 301 and the first through hole 2 can be known by observing the orientation of the tip of the pointing block 901.

[0071] When the tip of the pointing block 901 faces one of the first through holes 2, the above cooperation state is state one; when the tip of the pointing block 901 faces between two adjacent first through holes 2, the above cooperation state is state two.

[0072] In this embodiment: One end of the second handle 10 is connected to the outer arc surface of the rotating ring 7, and the other end penetrates through the installation shell 4 and extends to the outside. The second handle 10 faces one of the second pressing parts 701.

[0073] An arc-shaped groove 11 communicating with the installation cavity is formed on the outer arc surface of the installation shell 4, and the second handle 10 is slidably matched with the arc-shaped groove 11.

[0074] Among them, the arc-shaped groove 11 is located between two adjacent first through holes 2. The lower end of the arc-shaped groove 11 and the axis of one of the first through holes 2 are on the same horizontal line, and the upper end is located in the middle between the two first through holes 2.

[0075] When the operator needs to rotate the rotating ring 7, the cooperation state between the second pressing part 701 and the first through hole 2 can be known by the position of the second handle 10 in the arc-shaped groove 11.

[0076] The extreme position where the second handle 10 can rotate is affected by the length of the arc-shaped groove 11. When the second handle 10 is located at the lower end of the arc-shaped groove 11, the above cooperation state is state one; when the second handle 10 is located at the upper end of the arc-shaped groove 11, the above cooperation state is state two.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An auxiliary device for the tensioning construction of prestressed steel strands of a bridge slab, comprising a housing and a plurality of jackets evenly distributed in a ring with the housing as the axis. The jacket is a conical structure composed of three clamping pieces (1), and is characterized in that: A plurality of first through holes (2) corresponding to the plurality of jackets one by one are formed in the housing, and the first through holes (2) are used for the jackets to pass through; A turntable (3) is rotatably fitted at the center of the housing. A plurality of first pressing portions (301) annularly and evenly distributed with the housing as the axis are arranged on the arc surface of the turntable (3). All the plurality of first through holes (2) are located on the rotation trajectories of the first pressing portions (301), and the plurality of first pressing portions (301) can be rotated to be opposite to the plurality of first through holes (2) one by one.

2. The auxiliary device for the tensioning construction of the prestressed steel strand of the bridge slab according to claim 1, wherein: A convex portion (101) is arranged at the tail end of the clip (1), and the convex portion (101) extends along the thickness direction of the clip (1); The first pressing portion (301) can be rotated between the convex portion (101) and the first through hole (2).

3. The auxiliary device for the tensioning construction of the prestressed steel strand of the bridge slab according to claim 1, characterized in that: The housing includes a mounting shell (4) and a baffle (401). The baffle (401) is connected to one side of the mounting shell (4), and an installation cavity for installing the turntable (3) is formed between the two. The installation cavity is communicated with the first through hole (2). The tail end of the jacket can be inserted into the installation cavity through the first through hole (2) and abuts against the baffle (401).

4. The auxiliary device for the tensioning construction of the prestressed steel strand of the bridge slab according to claim 3, characterized in that: A second through hole (5) communicated with the installation cavity is formed in the baffle (401); It further includes a movable plate (6). A plurality of insertion blocks (601) corresponding to the plurality of jackets one by one are arranged on one surface of the movable plate (6). The insertion blocks (601) can be inserted into the installation cavity through the second through hole (5) and abut against the inner wall of the jacket. The insertion blocks (601) are frustum-shaped.

5. The auxiliary device for tensioning the prestressed steel strands of the bridge slab according to claim 3, characterized in that: A rotating ring (7) capable of rotating coaxially with the turntable (3) is further arranged on the mounting shell (4), and the first through hole (2) is located between the rotating ring (7) and the turntable (3); A plurality of second pressing portions (701) annularly and evenly distributed with the mounting shell (4) as the axis are arranged on the inner arc surface of the rotating ring (7). All the plurality of first through holes (2) are located on the rotation trajectories of the second pressing portions (701), and the plurality of second pressing portions (701) can be rotated to be opposite to the plurality of first through holes (2) one by one; The second pressing portion (701) can be rotated between the convex portion (101) and the first through hole (2).

6. The auxiliary device for the tensioning construction of prestressed steel strands of bridge slabs according to claim 5, characterized in that: An annular chute (8) is arranged on the inner wall of the installation cavity, and a sliding block (801) slidably matched with the chute (8) is arranged on the rotating ring (7).

7. The auxiliary device for the tensioning construction of the prestressed steel strand of the bridge slab according to claim 5, wherein: A first handle (9) and a second handle (10) for facilitating the operator to dial are respectively arranged on the turntable (3) and the rotating ring (7).

8. The auxiliary device for the tensioning construction of the prestressed steel strand of the bridge slab according to claim 7, characterized in that: One end of the first handle (9) is coaxially connected to the turntable (3), and the other end penetrates through the baffle (401) and extends to the outside.

9. The auxiliary device for the tensioning construction of the prestressed steel strand of the bridge slab according to claim 8, characterized in that: A pointing block (901) is arranged at the end of the first handle (9) away from the baffle (401). One end of the pointing block (901) is a tip, and the tip faces one of the first pressing portions (301).

10. The auxiliary device for the tensioning construction of the prestressed steel strand of the bridge slab according to claim 7, wherein: One end of the second handle (10) is connected to the outer arc surface of the rotating ring (7), and the other end penetrates through the mounting shell (4) and extends to the outside. The second handle (10) faces one of the second pressing portions (701); An arc-shaped groove (11) communicating with the installation cavity is formed on the outer arc surface of the installation shell (4), and the second handle (10) is slidably matched with the arc-shaped groove (11).

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