Prestressed steel strand separating mechanism and box girder

Abstract

The utility model relates to a prestressed steel strand separating mechanism and box girder, the prestressed steel strand separating mechanism comprises a separating plate and a pipe clamp assembly, the separating plate is provided with a central separating hole, a plurality of circumferential separating holes and a slurry passing groove, the central separating hole, the circumferential separating holes and the slurry passing groove penetrate through the separating plate, the circumferential separating holes are communicated with the slurry passing groove, and the slurry passing groove is communicated with the pipe clamp assembly. The wire dividing plate is provided with a plurality of circumferential wire dividing holes, the circumferential wire dividing holes are distributed along the circumference of the central wire dividing hole in an array mode, the number of the pipe clamp assemblies is two, positioning holes penetrating through the pipe clamp assemblies are formed in the pipe clamp assemblies, the two pipe clamp assemblies abut against the two opposite faces of the wire dividing plate respectively, and the positioning holes communicate with the central wire dividing hole. According to the prestressed steel strand splitting mechanism and the box girder, a plurality of steel strands can be split, so that each steel strand can be separated in order, and the deviation of the wire splitting plate at the position of the corrugated pipe is prevented. Meanwhile, the situation that circulation of cement grout is affected due to blocking of the wire separating plate is avoided.

Description

Technical Field

[0001] This utility model relates to the field of prestressed steel strand anchoring technology, and in particular to a prestressed steel strand splitting mechanism and a box girder. Background Technology

[0002] In modern construction engineering, prestressed technology is an important technique widely used in large-span structures, high-rise buildings, railways, bridges, and other large-scale building structures. The core of prestressed technology lies in improving the load-bearing capacity and stability of a structure through pre-applied stress. As a key material in prestressed structures, the method of fixing steel strands directly affects the performance and safety of the prestressed structure.

[0003] Currently, most prestressed steel strands are threaded individually, using a threading machine to pass the strand from one end of the box girder to the other. However, this method suffers from low construction efficiency and the strands are prone to tangling during the threading process. If a single-strand threading method is used, the prestressed steel strand bundle consists of multiple strands. Before threading, these strands should be pre-bundled and securely wrapped with plastic sleeves, then threaded using a winch. However, this method is more difficult to execute. Utility Model Content

[0004] In view of this, the present invention provides a prestressed steel strand splitting mechanism and a box girder to solve the problem of prestressed steel strand threading.

[0005] To achieve the above objectives, the technical solution of this utility model is to provide a prestressed steel strand splitting mechanism, comprising: a splitting plate and a pipe clamp assembly. The splitting plate is provided with a central splitting hole, a circumferential splitting hole, and a slurry passage groove. The number of circumferential splitting holes is multiple, and the multiple circumferential splitting holes are arranged in an array along the circumference of the central splitting hole. The number of pipe clamp assemblies is two, and a positioning hole is provided on the pipe clamp assembly. The two pipe clamp assemblies abut against opposite sides of the splitting plate, and the positioning hole communicates with the central splitting hole.

[0006] In one embodiment, the slurry channel includes a first flow hole and a second flow channel, the first flow hole being located between the central filament splitting hole and the circumferential filament splitting hole, and the second flow channel being located around the periphery of the filament splitting plate.

[0007] In one embodiment, the first flow hole is an arc-shaped hole, and there are multiple such holes, which are arranged in a circumferential array along the central branching hole.

[0008] In one embodiment, the second flow groove is arc-shaped and there are multiple such grooves, which are arranged in a circumferential array along the central filament hole.

[0009] In one embodiment, the number of circumferential wire-splitting holes is six.

[0010] In one embodiment, the pipe clamp assembly includes a first snap-fit ​​member and a second snap-fit ​​member, which are joined together to form the pipe clamp assembly and to form the positioning hole.

[0011] In one embodiment, the first card connector is provided with a first card receiving platform, and the second card connector is provided with a second card receiving platform. Both the first card receiving platform and the second card receiving platform are provided with through holes, and the through holes of the two are concentric. A fixing member is provided in the through hole to fix the relative position between the first card receiving platform and the second card receiving platform.

[0012] In one embodiment, there are two first card slots and two second card slots, with the two first card slots disposed on opposite sides of the first card slot and the two second card slots disposed on opposite sides of the second card slot.

[0013] In one embodiment, a rubber pad is provided inside the positioning hole.

[0014] This utility model also provides a prestressed box girder, including a prestressed steel strand splitting mechanism, anchorage, corrugated pipe, and steel strands. The corrugated pipe is disposed inside the prestressed box girder and filled with cement grout. The prestressed steel strand splitting mechanism is used to bundle multiple steel strands and fix them to the steel strands. The steel strands pass through the corrugated pipe. The anchorage is used to anchor the steel strands passing through the corrugated pipe. The anchorage includes a clamp, an anchor plate, a pad, and a spiral reinforcement. The anchor plate abuts against one side of the pad and has a conical hole penetrating the anchor plate. The clamp is adapted to the shape of the conical hole to cooperate with the conical hole to anchor the steel strands passing through the conical hole. The pad has a wire-passing hole communicating with the conical hole. The spiral reinforcement is sleeved on the side of the pad away from the anchor plate and abuts against the concrete on both sides of the prestressed box girder.

[0015] Compared with the prior art, the prestressed steel strand splitting mechanism and box girder provided by this utility model have the following beneficial effects:

[0016] Multiple steel strands are bundled using the central and circumferential branching holes on the branching plate to ensure that each strand is separated in an orderly manner, avoiding mutual interference and pressure on the strands. Pipe clamps are fixed to the steel strands on either side of the central branching hole, and grout passage grooves are provided on the branching plate to prevent the plate from shifting after the strands are bundled and fed into the corrugated pipe. Simultaneously, during grouting inside the corrugated pipe, the cement grout can flow through the grout passage grooves, preventing obstruction of the branching plate from affecting the flow of the cement grout. Attached Figure Description

[0017] Figure 1 A schematic diagram of a prestressed steel strand splitting mechanism provided in the first embodiment of this utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the split wire plate;

[0019] Figure 3 for Figure 1 Schematic diagram of the central tube clamp assembly;

[0020] Figure 4 A cross-sectional structural schematic diagram of a prestressed box girder provided for the second embodiment of this utility model;

[0021] Explanation of reference numerals in the attached figures:

[0022] 10. Prestressed steel strand splitting mechanism;

[0023] 1. Wire splitter plate; 11. Central wire splitting hole; 12. Circumferential wire splitting hole; 13. Slurry passage groove; 131. First flow hole; 132. Second flow groove; 2. Pipe clamp assembly; 21. Positioning hole; 22. First clamping connector; 221. First clamping platform; 23. Second clamping connector; 231. Second clamping platform; 24. Rubber pad; 25. Fixing component;

[0024] 30. Prestressed box girder;

[0025] 31. Anchor; 311. Wedge; 312. Anchor plate; 313. Pad; 314. Spiral reinforcement; 32. Corrugated pipe; 33. Steel strand. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Please see Figure 1-3 This utility model provides a prestressed steel strand splitting mechanism 10, including a splitting plate 1 and a pipe clamp assembly 2. The splitting plate 1 is provided with a central splitting hole 11, a circumferential splitting hole 12 and a slurry groove 13. There are multiple circumferential splitting holes 12, which are arranged in a circular array along the central splitting hole 11. There are two pipe clamp assemblies 2, which are provided with through positioning holes 21. The two pipe clamp assemblies 2 respectively abut against the opposite sides of the splitting plate 1, and the positioning holes 21 are connected to the central splitting holes 11.

[0028] Specifically, multiple prestressed steel strands are bundled through the central branching hole 11 and the circumferential branching hole 12, respectively. That is, each prestressed steel strand passes through the central branching hole 11 and the circumferential branching hole 12 to avoid the problem of multiple prestressed steel strands becoming entangled. The pipe clamp assembly 2 fixes the opposite sides of the steel strand passing through the central branching hole 11 through the positioning hole 21, and clamps the steel strand to the opposite sides of the branching plate 1 by abutting against it, to prevent the prestressed steel strand branching mechanism 10 from shifting during subsequent grouting. The grout passage 13 is used to prevent the cement grout from clogging during grouting, allowing the cement grout to flow through the grout passage 13 to fill the corrugated pipe.

[0029] It is understandable that the pipe clamp assembly 2 is not connected to the wire splitter 1. Instead, after the pipe clamp assembly 2 fixes the steel strand through the positioning hole 21, the tension of the steel strand is used to clamp the wire splitter 1 between the pipe clamp assemblies 2 on both sides.

[0030] In one embodiment, the slurry channel 13 includes a first flow hole 131 and a second flow channel 132. The first flow hole 131 is located between the central filament splitting hole 11 and the circumferential filament splitting hole 12, and the second flow channel 132 is located around the periphery of the filament splitting plate 1.

[0031] It is understandable that by setting the first flow hole 131 and the second flow groove 132, the cement grout can pass through the first flow hole 131 and the second flow groove 132 quickly during the grouting process, thereby increasing the efficiency of grouting, that is, increasing the efficiency of the cement grout filling the corrugated pipe.

[0032] Furthermore, the first flow hole 131 is an arc-shaped hole, and there are multiple of them. The multiple first flow holes 131 are arranged in a circular array along the central wire-splitting hole 11.

[0033] In this embodiment, the width H between the two long sides of the first flow hole 131 is 10mm, and the spacing L between two adjacent first flow holes 131 along the circumferential direction of the wire splitting plate 1 is also 10mm.

[0034] Preferably, there are four first flow holes 131, which are arranged in a circumferential array along the central wire branching hole 11 and are all located between the central wire branching hole 11 and the circumferential wire branching hole 12.

[0035] Furthermore, the second flow groove 132 is arc-shaped, and there are multiple of them. The multiple second flow grooves 132 are arranged in a circumferential array along the central wire-splitting hole 11.

[0036] In this embodiment, the second flow channel 132 is a semi-circular arc.

[0037] Preferably, there are six second flow channels 132, which are arranged in a circular array around the central wire splitting hole 11 at equal intervals and are all located around the periphery of the wire splitting plate 1.

[0038] Understandably, the shapes of the first flow hole 131 and the second flow groove 132 facilitate the flow of cement grout during grouting, thereby increasing the efficiency of grouting.

[0039] Furthermore, the number of circumferential splitting holes 12 is six.

[0040] Understandably, the six circumferential wire splitting holes 12 and the central wire splitting hole 11 can simultaneously split the six steel strands.

[0041] In one embodiment, the pipe clamp assembly 2 includes a first clamping member 22 and a second clamping member 23. The first clamping member 22 and the second clamping member 23 are spliced ​​together to form the pipe clamp assembly 2 and form a positioning hole 21.

[0042] It is understandable that the first snap-fit ​​component 22 and the second snap-fit ​​component 23 can be the same shape and structure or different shapes and structures. They can be spliced ​​together by snap-fit ​​or any other means, as long as they can be spliced ​​together to form the pipe clamp assembly 2 and form the positioning hole 21 for clamping the steel strand on the pipe clamp assembly 2.

[0043] Furthermore, the first card connector 22 is provided with a first card receiving platform 221, and the second card connector 23 is provided with a second card receiving platform 231. Both the first card receiving platform 221 and the second card receiving platform 231 are provided with through holes, and the through holes of the two are concentric. A fixing member 25 is provided in the through hole to fix the relative position between the first card receiving platform 221 and the second card receiving platform 231.

[0044] It is understandable that the fastener 25 can be any structure such as a bolt or pin, as long as it can pass through the through holes of the first snap-fit ​​platform 221 and the second snap-fit ​​platform 231 at the same time, and fix the relative positions of the first snap-fit ​​platform 221 and the second snap-fit ​​platform 231, so as to realize the splicing of the first snap-fit ​​member 22 and the second snap-fit ​​member 23.

[0045] Furthermore, there are two first card receiving platforms 221 and two second card receiving platforms 231. The two first card receiving platforms 221 are located on opposite sides of the first card receiving member 22, and the two second card receiving platforms 231 are located on opposite sides of the second card receiving member 23.

[0046] It is understandable that by setting the first card connector 221 and the second card connector 231 on opposite sides of the first card connector 22 and the second card connector 23 respectively, the stability of splicing can be increased.

[0047] Furthermore, a rubber pad 24 is provided inside the positioning hole 21 to increase the friction coefficient of the steel strand in the positioning hole 21, thereby increasing the fixing effect between the pipe clamp assembly 2 and the steel strand.

[0048] Understandably, adding rubber pad 24 can also reduce the gap between positioning hole 21 and steel strand, making positioning hole 21 fit the steel strand better, and thus increasing the fixing effect between pipe clamp assembly 2 and steel strand.

[0049] like Figure 4 As shown, the second embodiment of this utility model provides a prestressed box girder 30, which includes a prestressed steel strand splitting mechanism 10, an anchor 31, a corrugated pipe 32, and steel strands 33. The corrugated pipe 32 is disposed inside the prestressed box girder 30 and filled with cement grout. The prestressed steel strand splitting mechanism 10 is used to split multiple steel strands 33 into bundles and fix them on the steel strands 33. The steel strands 33 pass through the corrugated pipe 32, and the anchor 31 is used to anchor the steel strands passing through the corrugated pipe 32.

[0050] Specifically, multiple steel strands 33 are bundled by the prestressed steel strand splitting mechanism 10 and then pass through the corrugated pipe 32. Anchors 31 are located on opposite sides of the corrugated pipe 32 and anchor the multiple steel strands 33 from both sides. Then, grout is injected into the corrugated pipe 32. The cement grout flows through the grouting groove 13 set on the splitting plate 1 of the prestressed steel strand splitting mechanism 10 and flows in the corrugated pipe 32 to fill the entire corrugated pipe 32, forming a prestressed box girder 30.

[0051] It is understood that there are multiple sets of prestressed steel strand splitting mechanisms 10, and each set of prestressed steel strand splitting mechanisms 10 contains multiple sets. In each set, multiple prestressed steel strand splitting mechanisms 10 are arranged sequentially along the axial direction of the same bundle of steel strands 33, and multiple sets of prestressed steel strand splitting mechanisms 10 are arranged side by side in the corrugated pipe 32 along the direction perpendicular to the axial direction of the corrugated pipe 32.

[0052] Preferably, the multiple prestressed steel strand splitting mechanisms 10 in each group are spaced 5m apart.

[0053] In one embodiment, the anchor 31 includes a clamp 311, an anchor plate 312, a pad 313, and a spiral reinforcement 314. The anchor plate 312 abuts against one side of the pad 313 and has a conical hole through it. The clamp 311 is adapted to the shape of the conical hole to anchor the steel strand passing through the conical hole. The pad 313 has a wire passage hole communicating with the conical hole. The spiral reinforcement 314 is sleeved on the side of the pad 313 away from the anchor plate 312 and abuts against the concrete on both sides of the prestressed box girder 30 to transfer the prestress to the concrete.

[0054] It should be noted that there can be multiple tapered holes, the number of which corresponds to the number of circumferential splitting holes 12 and central splitting holes 11 of the prestressed steel strand splitting mechanism 10. The number of clamps 311 corresponds to the number of tapered holes and is used to anchor each steel strand 33 that passes through the tapered hole. After the steel strand 33 is bundled by the prestressed steel strand splitting mechanism 10, each steel strand 33 passes through a corresponding tapered hole. The anchoring of the clamps 311 and the tapered holes prevents the steel strand 33 from retracting.

[0055] Furthermore, the pad 313 is provided with grouting holes for injecting cement grout into the corrugated pipe 32.

[0056] The working principle of this utility model is as follows: First, the prestressed steel strands 33 are bundled by the prestressed steel strand splitting mechanism 10 and then fed into the corrugated pipe 32 inside the prestressed box girder 30, with each steel strand 33 passing through a conical hole in the anchor plate 312. Then, the steel strands 33 passing through the conical holes are clamped and anchored using clamping plates 311 to prevent them from retracting. Next, prestressing is applied to the steel strands 33 multiple times using jacks or similar devices. When the force is released after each tensioning, the pad plate 313 and the spiral reinforcement 314 buffer the force to prevent damage to the concrete structure of the prestressed box girder 30. The spiral reinforcement 314, by transmitting the tension force, improves the load-bearing capacity, crack resistance, stiffness, and stability of the concrete component. Finally, cement grout is injected into the corrugated pipe 32 through the grouting hole. The cement grout flows along the corrugated pipe 32 through the grouting groove 13 of the prestressed steel strand splitting mechanism 10, so that the steel strand 33 maintains a good alignment during the use of the bridge, improving the stability and durability of the bridge. After grouting is completed, the anchor is sealed.

[0057] Compared with existing technologies, the prestressed steel strand splitting mechanism and box girder provided by this utility model use the central and circumferential splitting holes on the splitting plate to bundle multiple steel strands, ensuring that each steel strand is separated in an orderly manner and avoiding mutual interference and pressure on the steel strands. Pipe clamp assemblies are fixed to the steel strands on both sides of the central splitting hole, and a grout passage groove is provided on the splitting plate to prevent the position of the splitting plate from shifting after the steel strands are bundled and fed into the corrugated pipe. Simultaneously, during grouting in the corrugated pipe, the cement grout can flow through the grout passage groove within the corrugated pipe, avoiding obstruction of the cement grout flow by the splitting plate.

[0058] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A prestressed steel strand splitting mechanism, characterized in that, include: The fiber splitting plate and pipe clamp assembly are provided. The fiber splitting plate is provided with a central fiber splitting hole, a circumferential fiber splitting hole and a slurry passage groove. There are multiple circumferential fiber splitting holes, which are arranged in an array along the circumference of the central fiber splitting plate. There are two pipe clamp assemblies, each with a positioning hole that penetrates through it. The two pipe clamp assemblies abut against opposite sides of the fiber splitting plate, and the positioning hole communicates with the central fiber splitting hole.

2. The prestressed steel strand splitting mechanism as described in claim 1, characterized in that: The slurry channel includes a first flow hole and a second flow channel. The first flow hole is located between the central filament splitting hole and the circumferential filament splitting hole, and the second flow channel is located around the periphery of the filament splitting plate.

3. The prestressed steel strand splitting mechanism as described in claim 2, characterized in that: The first flow hole is an arc-shaped hole, and there are multiple of them. The multiple first flow holes are arranged in a circumferential array along the central branch hole.

4. The prestressed steel strand splitting mechanism as described in claim 2, characterized in that: The second flow groove is arc-shaped, and there are multiple of them. The multiple second flow grooves are arranged in a circumferential array along the central wire hole.

5. A prestressed steel strand splitting mechanism as described in claim 1, characterized in that: The number of circumferential splitting holes is six.

6. The prestressed steel strand splitting mechanism as described in claim 1, characterized in that: The pipe clamp assembly includes a first clamping component and a second clamping component. The first clamping component and the second clamping component are spliced ​​together to form the pipe clamp assembly and form the positioning hole.

7. A prestressed steel strand splitting mechanism as described in claim 6, characterized in that: The first card connector is provided with a first card receiving platform, and the second card connector is provided with a second card receiving platform. Both the first card receiving platform and the second card receiving platform are provided with through holes, and the through holes of the two are concentric. A fixing member is provided in the through hole to fix the relative position between the first card receiving platform and the second card receiving platform.

8. A prestressed steel strand splitting mechanism as described in claim 7, characterized in that: There are two first card receiving stations and two second card receiving stations. The two first card receiving stations are located on opposite sides of the first card receiving member, and the two second card receiving stations are located on opposite sides of the second card receiving member.

9. A prestressed steel strand splitting mechanism as described in claim 1, characterized in that: A rubber pad is provided inside the positioning hole.

10. A prestressed box girder, characterized in that, The invention includes a prestressed steel strand splitting mechanism, an anchor, a corrugated pipe, and steel strands as described in any one of claims 1-9. The corrugated pipe is disposed inside the prestressed box girder and filled with cement grout. The prestressed steel strand splitting mechanism is used to split multiple steel strands into bundles and fix them to the steel strands. The steel strands pass through the corrugated pipe, and the anchor is used to anchor the steel strands passing through the corrugated pipe. The anchor includes a wedge, an anchor plate, a pad, and a spiral reinforcement. The anchor plate abuts against one side of the pad and has a conical hole penetrating through it. The wedge is adapted to the shape of the conical hole to anchor the steel strand passing through it. The pad has a wire-passing hole communicating with the conical hole. The spiral reinforcement is fitted on the side of the pad away from the anchor plate and abuts against the concrete on both sides of the prestressed box girder.

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