Tensioning construction device for sand-embedded epoxy coating steel strand

Abstract

The utility model relates to a tensioning construction device for a sand-embedded epoxy coating steel strand, which comprises a tensioning jack, a supporting cylinder, a tool clamping piece, a temporary tool anchor and a jacking device which are sequentially arranged, a tool clamping piece pressing plate is further arranged in the supporting cylinder, the tool clamping piece pressing plate comprises a pressing plate body and N connecting lugs, a plurality of through holes for steel strands to penetrate through are formed in the pressing plate body, N sliding ways are formed in the supporting cylinder, N is any integer from 2 to 10, an annular connecting plate is installed on the side face of the temporary tool anchor, and the connecting lugs of the tool clamping piece pressing plate penetrate through the sliding ways of the supporting cylinder and are connected with the annular connecting plate on the temporary tool anchor through connecting pieces. According to the anchor group tensioning device, a plurality of steel strands can be tensioned at the same time, namely anchor group tensioning is achieved, the tensioning work efficiency is high, after tensioning is conducted in place, the anchoring teeth of the work clamping pieces can be made to penetrate through the epoxy coatings of the sand-embedded epoxy coating steel strands in an engaged mode through external force and be engaged into the steel strands, and the anchoring performance is more reliable.

Description

Technical Field

[0001] The utility model relates to a tensioning device, in particular to a tensioning construction device for a sand-embedded epoxy-coated steel strand. Background Art

[0002] In the construction of new energy wind power, many prestressed technologies are applied. Among them, the floating base of the offshore wind turbine tower is immersed in water. The base uses a large number of sand-embedded epoxy-coated steel strands. The steel strand is twisted by 7 steel wires. A layer of 0.38-1.14mm thick epoxy coating is sprayed on the outer layer of the steel strand. In order to increase the bonding performance between the steel strand and the concrete, a layer of sand of about 1000 mesh is also embedded on the surface of the steel strand epoxy coating.

[0003] Normal smooth steel strands, or ordinary epoxy steel strands, are tensioned using limit plates, with the clips anchored by the retraction of the steel strands. If ordinary limit plates are also used for tensioning in the sand-embedded epoxy-coated steel strand anchoring system, because the epoxy coating of the steel strands is relatively thick, the self-anchoring method cannot allow the anchoring teeth of the clips to penetrate the epoxy layer of the strands. After tensioning, the teeth of the clips only bite into the epoxy coating of the strands, and do not bite deeply into the steel strands. This can easily cause thread slippage during later operations, leading to engineering accidents. Current patent literature discloses a jack structure that can generate pressure to clamp the clips to the steel strands, but this jack is only suitable for tensioning a single steel strand, not for group anchor tensioning, and the tensioning efficiency is very low.

[0004] Furthermore, the steel strands of offshore wind turbine towers are typically quite long, ranging from 40 to 110 meters, requiring high tensioning requirements. During tensioning, the jacks' travel is insufficient, requiring multiple reversals. Using jacks designed only for a single strand would severely impact tensioning efficiency. Currently, no tensioning device suitable for group anchor tensioning and capable of enabling clips to penetrate the epoxy coating of sand-embedded epoxy-coated steel strands is known. Summary of the Invention

[0005] The technical problem to be solved by the utility model is: to provide a tensioning construction device for sand-embedded epoxy-coated steel strands, which can tension multiple steel strands at the same time, that is, group anchor tensioning, and has high tensioning efficiency. After tensioning is in place, the anchoring teeth of the working clip can be bitten through the epoxy coating of the sand-embedded epoxy-coated steel strands by external force and bite into the steel strands, so that the anchoring performance is more reliable.

[0006] The technical solution to solve the above technical problems is: a tensioning construction device for sand-embedded epoxy-coated steel strands, comprising a tensioning jack, a support tube, a temporary tool anchor and a jack arranged in sequence, and also comprising a tool clip cooperating with the temporary tool anchor to clamp the steel strands. A tool clip pressure plate is also provided in the support tube, and the tool clip pressure plate comprises a pressure plate body and N connecting ears connected to the pressure plate body. The pressure plate body is provided with a plurality of through holes for the steel strands to pass through, and the support tube is provided with N slideways, N being any integer from 2 to 10. An annular connecting plate is installed on the side of the temporary tool anchor, and the connecting ears of the tool clip pressure plate pass through the slideway of the support tube and are connected to the annular connecting plate on the temporary tool anchor through a connecting piece.

[0007] Furthermore, the tensioning jack is a front-clip jack, and a built-in tool anchor and a built-in clip for clamping the steel strand are provided in the piston of the front-clip jack.

[0008] Furthermore, the connecting ear of the tool clip pressure plate is connected to the annular connecting plate on the temporary tool anchor by tightening screws or bolts and nuts.

[0009] Furthermore, four connecting ears are evenly distributed on the side of the pressure plate body, and four rectangular slideways are opened on the support tube.

[0010] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0011] 1. The utility model includes a jack and a jacking device. A temporary tool anchor is set between the jack and the jacking device, and a tool clip pressure plate is used to simultaneously press multiple tool clips that cooperate with the temporary tool anchor. It can simultaneously tension multiple steel strands, that is, group anchor tensioning. Compared with the tensioning method of a single tensioning steel strand, the work efficiency is higher.

[0012] 2. The anchoring performance of the sand-embedded epoxy-coated steel strand after tensioning is better with this utility model. The utility model is provided with a presser. After tensioning, the presser applies external force to the working clamp, causing the anchor teeth of the working clamp to bite through the epoxy coating and into the steel strand, thereby achieving reliable anchoring performance when the tension of the steel strand is released.

[0013] 3. Using a front-clip jack as a tensioning jack can save steel strands. The front-clip jack requires a shorter working length of steel strands, which is generally 500mm shorter than the conventional through-type jack (the tool anchor is installed behind the jack).

[0014] The technical features of the tensioning construction device for a sand-embedded epoxy-coated steel strand of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : A three-dimensional diagram of the use status of the tensioning construction device of the sand-embedded epoxy-coated steel strand of the present invention.

[0016] Figure 2 : The main view of the use status of the tensioning construction device of the sand-embedded epoxy-coated steel strand of the present invention.

[0017] Figure 3 : A three-dimensional diagram of the use status of the tensioning construction device of the sand-embedded epoxy-coated steel strand of the present invention (showing the internal structure).

[0018] Figure 4 : The front view of the tool clip pressure plate of the present utility model.

[0019] Figure 5 : A three-dimensional diagram of the tool clip pressure plate of the present utility model.

[0020] Figure 6 : A three-dimensional diagram of the support tube of the present utility model.

[0021] In the figure: 1-tensioning jack, 2-support cylinder, 21-slide, 3-tool clip pressure plate, 4-temporary tool anchor, 5-jacking device, 6-annular connecting plate, 7-connecting piece, 8-tool clip, 9-built-in tool anchor, 10-built-in clip.

[0022] P1-working anchor, P2-sand embedded epoxy coated steel strand, P3-working clip. DETAILED DESCRIPTION Example

[0023] A tensioning construction device for sand-embedded epoxy-coated steel strands, such as Figures 1-6 As shown, it includes a tensioning jack 1, a support tube 2, a temporary tool anchor 4 and a jack 5 arranged in sequence, and also includes a tool clip 8 that cooperates with the temporary tool anchor 4 to clamp the steel strand. A tool clip pressure plate 3 is also provided in the support tube 2. The tool clip pressure plate 3 includes a pressure plate body 31 and four connecting ears 32 connected to the pressure plate body. The four connecting ears 32 are evenly distributed on the side of the pressure plate body 31. The pressure plate body 31 is provided with a plurality of through holes for the steel strands to pass through. The support tube is provided with four rectangular slideways 21. An annular connecting plate 6 is installed on the side of the temporary tool anchor 4 facing one end of the support tube 2. The connecting ears 32 of the tool clip pressure plate 3 pass through the slideway 21 of the support tube 2 and are connected to the annular connecting plate 6 on the temporary tool anchor 4 through a connector 7.

[0024] In this embodiment, the tensioning jack 1 is a front-clip jack, and a built-in tool anchor 9 and a built-in clip 10 for clamping the steel strand are provided in the piston of the front-clip jack. One end of the sand-embedded epoxy-coated steel strand is installed in the piston of the front-clip jack through the built-in tool anchor 9 and the built-in clip 10 to be tensioned.

[0025] In this embodiment, the connecting member 7 is a tightening screw or a bolt and nut, that is, the connecting ear 32 of the tool clip pressure plate 3 is connected to the annular connecting plate 6 on the temporary tool anchor 4 via the tightening screw or bolt and nut. As an alternative, the connecting member 7 can also adopt other structures that are convenient for disassembly and assembly.

[0026] As a variation of this embodiment, the number of connecting ears of the tool clamp pressure plate and the number of slideways on the support tube can be increased or decreased according to actual conditions, generally 3 to 6.

[0027] The tensioning working process of this embodiment:

[0028] First, connect the steel strand to the piston of the front cassette jack through the built-in tool anchor 9 and the built-in clip 10, start the front cassette jack to start tensioning, and after the steel strand tensioning reaches the limit of the front cassette jack's stroke, tighten the tightening screw of the tool clip pressure plate 3 so that the tool clip pressure plate 3 presses the tool clip 8, the front cassette jack is released, the steel strand is anchored on the temporary tool anchor 4, and the front cassette jack is returned to the top; loosen the tightening screw of the tool clip pressure plate, adjust the tool clip pressure plate back to the back, start the front cassette jack to tension the steel strand, and repeat the above steps until the steel strand is tensioned to the designed tension.

[0029] After the front jack has tensioned the strand to the designed tension, the jacking piston pushes the work clip P3 into the anchor hole of the work anchor P1 without releasing the tension. External force causes the work clip's anchor teeth to penetrate the epoxy coating and into the strand, ensuring reliable anchoring when the strand tension is released. The tensioning process is completed by sequentially removing the front jack, support cylinder, tool clip pressure plate, temporary tool anchor, and jacking device.

Claims

1. A tensioning construction device for sand-embedded epoxy-coated steel strand, characterized by: The invention comprises a tensioning jack (1), a support tube (2), a temporary tool anchor (4) and a presser (5) arranged in sequence, and also comprises a tool clip (8) for clamping a steel strand in cooperation with the temporary tool anchor. A tool clip pressure plate (3) is further provided in the support tube. The tool clip pressure plate comprises a pressure plate body (31) and N connecting ears (32) connected to the pressure plate body. The pressure plate body is provided with a plurality of through holes for the steel strand to pass through. The support tube is provided with N slideways (21), where N is any integer between 2 and 10. An annular connecting plate (6) is installed on the side of the temporary tool anchor. The connecting ears (32) of the tool clip pressure plate pass through the slideway of the support tube and are connected to the annular connecting plate (6) on the temporary tool anchor through a connecting piece (7).

2. The tensioning construction device for sand-embedded epoxy-coated steel strand according to claim 1, characterized in that: The tensioning jack is a front-clip jack, and a built-in tool anchor (9) and a built-in clamping piece (10) for clamping the steel strand are provided in the piston of the front-clip jack.

3. The tensioning construction device for sand-embedded epoxy-coated steel strand according to claim 1 or 2, characterized in that: The connecting ear of the tool clamping plate is connected to the annular connecting plate on the temporary tool anchor through a tightening screw or a bolt and nut.

4. The tensioning construction device for sand-embedded epoxy-coated steel strand according to claim 1 or 2, characterized in that: Four connecting ears are evenly distributed on the side of the pressure plate body, and four rectangular slideways are opened on the support tube.

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