A prestressed anchor for steel strand anchorage and a construction method thereof

Abstract

The application discloses a prestressed anchorage device for steel strand anchoring, which comprises an anchoring device and a limiting device, and the anchoring device is divided into two layers, i.e., an upper layer and a lower layer; the upper layer is an anchorage disc which is provided with a cylindrical hollow steel strand reserved hole; a screwing device is installed in the reserved hole of the anchorage disc; the lower layer is a clamping disc; the clamping disc is further divided into a fastening steel ring and a high-elasticity buffer block; the high-elasticity buffer block is installed in the inside of the clamping disc; the fastening steel ring is wrapped around the periphery of the high-elasticity buffer block; the limiting device comprises a limiting plate and a spiral rib; the limiting plate is a half-shell solid steel plate; the stress is uniformly dispersed and transmitted to the concrete, and the transmission effect of the prestress is improved. The application also provides a construction method which is composed of six steps. The application overcomes the defects of the traditional prestressed anchoring technology of the anchorage device, further improves the anchoring effect of the anchorage device, and has great popularization value.

Description

Technical Field

[0001] This invention relates to the field of prestressed anchoring technology, and in particular to a prestressed anchor for steel strand anchoring and its construction method. Background Technology

[0002] With the continuous innovation and development of engineering construction, the demand for the functionality and practicality of anchors is constantly increasing, and the manufacturing technology of anchors is also gradually improving. This poses greater challenges to the various functions of anchors. All kinds of anchor products are constantly being developed and updated. There is still room for further improvement in the structure, form and function of anchors. It is necessary to improve and innovate the original anchors to ensure that anchors can meet the ever-evolving needs of engineering construction. Summary of the Invention

[0003] To overcome the shortcomings of existing prestressed anchoring technologies, such as poor anchoring effect of anchor wedges, loss during prestress transmission, and scattered anchoring devices that are difficult to transport, this invention provides a prestressed anchor for steel strand anchoring. Based on the original wedge design, a tightening device is incorporated, which can tighten the wedges via a knob, thereby tightening the steel strand and improving the prestress transmission effect. A clamping plate is added to adjust the clamping of the steel strand, ensuring its tightness. The limiting plate is designed as a solid semi-shell spherical shape.

[0004] The present invention adopts the following technical solution:

[0005] A prestressed anchor for anchoring steel strands is characterized by comprising an anchoring device and a limiting device. The anchoring device consists of two layers: an upper layer is an anchor plate with pre-reserved holes for cylindrical hollow steel strands, and a lower layer is a clamping plate, which is further divided into a fastening steel ring and a high-elasticity buffer block. The limiting device includes a limiting plate and a spiral reinforcement.

[0006] Preferably, a clamp is provided between the anchor plate and the steel strand, the clamp has two vertical gaps symmetrically arranged, the upper part of the clamp has concave stripes, and a tightening device is provided in the concave part.

[0007] Preferably, the tightening device includes a tightening ring, a one-way lock, and a plastic chain. The plastic chain has one-way teeth on its outer side, one end is fixedly connected to the clamp, is wound around the concave stripes on the upper part of the clamp, and is connected to the tightening ring through the one-way lock. The tightening ring is rotatable.

[0008] Preferably, the fastening steel ring consists of two arc-shaped plates, with two rubber sheets fitted against the arc-shaped plates, and a highly elastic buffer block wrapped inside. The two arc-shaped plates are provided with protruding threaded holes.

[0009] Preferably, the high-elasticity buffer block is also provided with pre-reserved holes for cylindrical hollow steel strands, and according to its elastic contraction properties, the high-elasticity buffer block is slightly higher than the fastening steel ring.

[0010] Preferably, the limiting plate is in the form of a solid hemispherical sphere, with spiral ribs embedded in the limiting plate.

[0011] Step 1: Concrete pouring and steel strand installation

[0012] Concrete formwork is erected, corrugated pipes are pre-embedded, and some construction space is reserved at the ends of the corrugated pipes. The concrete is vibrated and compacted during pouring. During concrete curing, the top surface is covered with felt to keep it warm and moist. The concrete strength of the beam is checked to ensure that the concrete strength meets the design requirements.

[0013] Step 2: Install prestressed anchorages

[0014] A. Install the limiting plate and spiral reinforcement to the corrugated pipe port. The spiral reinforcement is sleeved around the corrugated pipe. The connecting port of the limiting plate is sleeved at the port of the corrugated pipe. Insert the steel strand into one end of the corrugated pipe and push it continuously until it penetrates the corrugated pipe, leaving an operable length for anchoring construction.

[0015] B. The high-elasticity buffer block inside the clamping disc is provided with reserved holes of different specifications. The steel strand is passed through the reserved holes of the high-elasticity buffer block. While the steel strand passes through the reserved holes of the high-elasticity buffer block, it can further pass through the anchor plate. The anchor plate is provided with reserved holes for hollow cylindrical steel strands.

[0016] Step 3: Install the clamps and anchor the tightening device.

[0017] A. After the above-mentioned anchor parts are installed in place, the wedges are respectively placed around the steel strand. The wedges are symmetrically provided with two vertical gaps to facilitate pushing the wedges to the reserved holes provided in the anchor plate. After the wedges are in place, the anchoring operation is carried out.

[0018] B. The upper part of the clamp has concave stripes, and a tightening device is set in the concave area. The tightening device includes a tightening ring, a one-way lock, and a plastic chain. The tightening ring is surrounded by anti-slip gears. By rotating the tightening ring, the plastic chain connected to it is driven. At the same time, the other end of the plastic chain is fixedly connected to the clamp. When the plastic chain slides, it will pull the radius of the clamp to shrink inward. The two vertical gaps will continuously decrease, thus tightening the clamp. During the sliding process of the plastic chain, the one-way lock will be used to produce only one-way sliding. Lock the one-way lock to fix the clamp.

[0019] Step 4: Clamping the clamping plate

[0020] The fastening steel ring consists of two arc-shaped plates. Two rubber sheets are placed to fit against the arc-shaped plates. The two arc-shaped plates are provided with protruding threaded holes. By rotating the screw, the rubber sheets are compressed, reducing the distance between the arc-shaped plates, which in turn compresses the inner high-elasticity buffer block. When the high-elasticity buffer block contracts, the radius of the reserved holes in it decreases, better wrapping the clip and further improving the anchoring effect.

[0021] Step 5: Grouting

[0022] After the anchor is fixed, the hole to be grouted is first flushed with pressurized clean water to reduce the grouting pressure. Cement slurry with external additives is then injected from one end of the hole. After the thick slurry is discharged from the other end, the hole is sealed.

[0023] Step Six: Anchor sealing, construction completed.

[0024] The anchor installation location is the operating space reserved during concrete pouring. When the anchoring is completed, it needs to be sealed with concrete, and the overall construction steps are completed.

[0025] The beneficial effects of this invention are:

[0026] (1) A tightening device is installed on the upper part of the wedge of the prestressed anchor. The vertical gap on both sides of the wedge can be gradually closed by rotating the tightening device, which realizes the tightening of the wedge, clamps the steel strand, and improves the clamping effect of the wedge.

[0027] (2) The clamping plate is divided into a high elasticity buffer block and a fastening steel ring. The two parts of the clamping plate work simultaneously. The high elasticity buffer block generates compression deformation and clamps the steel strand at the same time, which can effectively improve the transmission effect of prestress.

[0028] (3) The limiting plate adopts a solid semi-shell spherical shape to avoid the prestress transmission being concentrated in a single area. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a prestressed anchor.

[0030] Figure 2 This is a schematic diagram of the construction method for prestressed anchorages.

[0031] Figure 3 This is a side cross-sectional view of a prestressed anchor.

[0032] Figure 4 This is a schematic diagram of the upper structure.

[0033] Figure 5 This is a schematic diagram of the clamping disc.

[0034] Figure 6 This is a schematic diagram of the clip.

[0035] Figure 7This is a top view of the tightening device.

[0036] Among them, 1 anchor plate, 2 clamping plate, 201 fastening steel ring, 202 high elasticity buffer block, 203 externally protruding threaded hole, 204 rubber sheet, 205 arc plate, 3 clamping plate, 301 vertical gap, 4 tightening device, 401 tightening ring, 402 one-way lock, 403 plastic chain, 404 anti-slip gear, 5 limiting plate, 501 connecting port, 6 spiral rib, 7 steel strand, 8 anchoring device, and 9 limiting device. Detailed Implementation

[0037] The following is combined with Figures 1-7 The present invention will be described in detail below:

[0038] A prestressed anchor for anchoring steel strands includes an anchoring device 8 and a limiting device 9. The anchoring device 8 is divided into upper and lower layers. The upper layer is an anchoring disc 1 with pre-reserved holes for cylindrical hollow steel strands 7. The lower layer is a clamping disc 2, which is further divided into a fastening steel ring 201 and a high-elasticity buffer block 202. The limiting device 9 includes a limiting plate 5 and a spiral reinforcement 6.

[0039] A clamping plate 3 is provided between the anchor plate 1 and the steel strand 7. The clamping plate 3 has two vertical gaps 301 symmetrically arranged. The vertical gaps 301 are not completely connected, so that the clamping plate 3 is still a whole. There are concave stripes on the upper part of the clamping plate 3. A tightening device 4 is provided in the concave part. When in use, the vertical gaps 301 on both sides of the clamping plate 3 can be gradually closed by rotating the tightening device 4, so as to ensure that the clamping plate 3 is compressed and clamps the steel strand 7.

[0040] The tightening device 4 includes a tightening ring 401, a one-way lock 402, and a plastic chain 403. The plastic chain 403 has one-way teeth on its outer side. One end is fixedly connected to the clamp 3 and is wound around the concave stripes on the upper part of the clamp 3 and connected to the tightening ring 401 through the one-way lock 402. The other end is connected to the tightening ring 401. The tightening ring 401 can rotate. During use, rotating the tightening ring 401 drags the plastic chain 403 connected to the tightening ring 401. The one-way teeth on the outer side of the plastic chain 403 tighten step by step through the one-way lock 402.

[0041] The fastening steel ring 201 consists of two arc-shaped plates 205. Two rubber sheets 204 are placed against the arc-shaped plates 205, and a high-elasticity buffer block 202 is wrapped around them. The two arc-shaped plates 205 are provided with protruding threaded holes 203. By tightening the threaded screws, the two arc-shaped plates 205 begin to move, the rubber sheets 204 are compressed and tightened, and the two arc-shaped plates 205 move closer together, further compressing and tightening the inner high-elasticity buffer block 202, thereby achieving further clamping of the steel strand 7.

[0042] The high-elasticity buffer block 202 is also provided with pre-reserved holes for the cylindrical hollow steel strand 7. According to its elastic contraction properties, the high-elasticity buffer block 202 is slightly higher than the fastening steel ring 201. When prestress is applied, the high-elasticity buffer block 202 will produce vertical compression deformation. Moreover, the outer fastening steel ring 201 restricts the horizontal deformation of the high-elasticity buffer block 202, thereby achieving the clamping of the steel strand 7.

[0043] The limiting plate 5 is in the form of a solid semi-shell sphere to avoid the transmission of prestress being concentrated in a single area, and the spiral rib 6 is embedded in the limiting plate 5.

[0044] Step 1: Concrete pouring and installation of steel strand 7

[0045] Concrete formwork is erected, corrugated pipes are pre-embedded, and some construction space is reserved at the ends of the corrugated pipes. The concrete is vibrated and compacted during pouring. During concrete curing, the top surface is covered with felt to keep it warm and moist. The concrete strength of the beam is checked to ensure that the concrete strength meets the design requirements.

[0046] Step 2: Install prestressed anchorages

[0047] A. Install the limiting plate 5 and the spiral reinforcement 6 to the corrugated pipe port. The spiral reinforcement 6 is sleeved around the corrugated pipe. The connecting port 501 of the limiting plate 5 is sleeved at the port of the corrugated pipe. Insert the steel strand 7 into one end of the corrugated pipe and push it continuously until it penetrates the corrugated pipe, leaving an operable length for anchoring construction.

[0048] B. The high-elasticity buffer block 202 inside the clamping plate 2 is provided with reserved holes of different specifications. The steel strand 7 is passed through the reserved holes of the high-elasticity buffer block 202. While passing through the reserved holes of the high-elasticity buffer block 202, the steel strand 7 can further pass through the anchor plate 1. The anchor plate 1 is provided with reserved holes for the cylindrical hollow steel strand 7.

[0049] Step 3: Install clamp 3 and anchor tightening device 4

[0050] A. After the above-mentioned anchor parts are installed in place, the clamps 3 are respectively placed around the steel strands 7. The clamps 3 are symmetrically provided with two vertical gaps 301, which facilitates pushing the clamps 3 to the reserved holes provided in the anchor plate 1. After the clamps 3 are in place, the anchoring operation is carried out.

[0051] B. The upper part of the clamp 3 has concave stripes, and a tightening device 4 is set in the concave area. The tightening device 4 includes a tightening ring 401, a one-way lock 402, and a plastic chain 403. The tightening ring 401 is surrounded by an anti-slip gear 404. By rotating the tightening ring 401, the plastic chain 403 connected to it is driven. At the same time, the other end of the plastic chain 403 is fixedly connected to the clamp 3. When the plastic chain 403 slides, it will pull the radius of the clamp 3 to shrink inward. The two vertical gaps 301 are continuously reduced, realizing the clamp shrinkage. During the sliding process of the plastic chain 403, the one-way lock 402 is used to generate only one-way sliding. The one-way lock 402 is locked to fix the clamp 3.

[0052] Step 4: Clamping of clamping plate 2

[0053] The fastening steel ring 201 consists of two arc-shaped plates. Two rubber sheets 204 are set to be spliced ​​with the arc-shaped plates 205. The two arc-shaped plates are provided with protruding threaded holes 203. By rotating the screw, the rubber sheets 204 are compressed, the distance between the arc-shaped plates 205 is reduced, and then the inner high-elasticity buffer block 202 is compressed. When the high-elasticity buffer block 202 shrinks, the radius of the reserved hole in it decreases, better wrapping the clamping piece 3 and further improving the anchoring effect.

[0054] Step 5: Grouting

[0055] After the anchor is fixed, the hole to be grouted is first flushed with pressurized clean water to reduce the grouting pressure. Cement slurry with external additives is then injected from one end of the hole. After the thick slurry is discharged from the other end, the hole is sealed.

[0056] Step Six: Anchor sealing, construction completed.

[0057] The anchor installation location is the operating space reserved during concrete pouring. When the anchoring is completed, it needs to be sealed with concrete, and the overall construction steps are completed.

[0058] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A prestressing anchor for anchoring of steel strands, c h a r a c t e r i s e d in that The utility model provides an improved pre-stressed anchorage device, including anchoring device (8) and limiting device (9), anchoring device (8) is divided into upper and lower two layers, and the upper layer is anchor disc (1), is provided with cylindrical hollow steel strand (7) reservation hole, and the lower layer is clamping disc (2), and clamping disc (2) is divided into fastening steel ring (201) and high elasticity buffer block (202) again, limiting device (9) includes limiting plate (5) and spiral rib (6); The anchor disc (1) is provided with a clamping piece (3) between the steel strand (7), the clamping piece (3) is symmetrically provided with two vertical gaps (301), and the upper part of the clamping piece (3) has a concave stripe, and the recess is provided with a screwing device (4); The screwing device (4) is installed in the reserved hole of the anchor disc (1); The screwing device (4) includes a screwing ring (401), a one-way lock (402) and a plastic chain (403), the plastic chain (403) is provided with a one-way sprocket on the outside, one end is fixedly connected with the clamping piece (3), is wound in the concave stripe of the upper part of the clamping piece (3), and passes through the one-way lock (402), and the other end is connected with the screwing ring (401) which can rotate freely; The fastening steel ring (201) is composed of two arc-shaped plates (205), two rubber sheets (204) are arranged opposite to the arc-shaped plates (205), and the high elasticity buffer block (202) is wrapped inside, and the two arc-shaped plates (205) are provided with outer convex thread holes (203); The high elasticity buffer block (202) is also provided with cylindrical hollow steel strand (7) reservation hole, and according to its elastic shrinkage property, the high elasticity buffer block (202) is slightly higher than the fastening steel ring (201); The limiting plate (5) adopts a solid half-shell spherical form, and the spiral rib (6) is embedded in the limiting plate (5).

2. A construction method of a prestressed anchor for steel strand anchorage, using the prestressed anchor for steel strand anchorage of claim 1, characterized in that, The utility model discloses an improved pre-stressed anchorage device, including the following technical steps: Step one: concrete pouring, steel strand (7) installation Build concrete formwork, embed corrugated pipe, and reserve part of construction space at the end of corrugated pipe, and vibrate and compact when pouring concrete; when curing concrete, cover the top surface with felt to keep warm and moist, check the strength of beam concrete, and ensure that the strength of concrete reaches the design requirement; Step two: install pre-stressed anchorage device Step three: clamp installation, anchoring of screwing device Step four: clamping of clamping disc (2) The fastening steel ring (201) is composed of two arc-shaped plates, two rubber sheets (204) are arranged opposite to the arc-shaped plates (205), and the two arc-shaped plates are provided with outer convex thread holes (203), by rotating screw, compressing rubber sheet (204), reducing the spacing between arc-shaped plates (205), and then compressing the high elasticity buffer block (202) wrapped inside, when the high elasticity buffer block (202) shrinks, the radius of the reserved hole in it is reduced, better wrapping the clamping piece (3), further improving the anchoring effect; Step five: grouting After anchorage is fixed, first flush the hole to be grouted with pressure water, carry out grouting pressure drop, use cement neat mortar, add external additive, then press the cement neat mortar from one end of the hole, after the other end discharges thick slurry, seal; Step six: anchorage sealing, complete construction The anchorage installation position is the operation space reserved when pouring concrete, when completing anchoring, need to seal with concrete pouring, complete the whole construction steps.

3. A method of construction of a prestressed anchor for anchoring of steel strand as claimed in claim 2, wherein, The second step is to install the prestressed anchor, and the specific operation method is as follows: A, the limiting plate (5) and the spiral rib (6) are installed to the corrugated pipe port, the spiral rib (6) is sleeved on the outer periphery of the corrugated pipe, the connecting port (501) of the limiting plate (5) is sleeved on the port of the corrugated pipe, the steel strand (7) is inserted into one end of the corrugated pipe, and is continuously pushed until it penetrates through the corrugated pipe and has an operable length for anchoring construction; B, the high-elasticity buffer block (202) in the clamping disc (2) is provided with different specifications of reserved holes, and the steel strand (7) passes through the reserved holes of the high-elasticity buffer block (202), wherein the steel strand (7) passes through the reserved holes of the high-elasticity buffer block (202) at the same time, and can further pass through the anchor disc (1), and the anchor disc (1) is provided with a cylindrical hollow steel strand (7) reserved hole.

4. The method of claim 2, wherein the method further comprises: The third step is to install the clamping piece and anchor the tightening device, and the specific operation method is as follows: A, after the above-mentioned anchor part is installed in place, the clamping piece (3) is sleeved on the outer periphery of the steel strand (7), the clamping piece (3) is symmetrically provided with two vertical gaps (301), so as to facilitate pushing the clamping piece (3) to the reserved hole of the anchor disc (1), after the clamping piece (3) is in place, the anchoring operation is carried out; B, the upper part of the clamping piece (3) has a concave stripe, and the recess is provided with a tightening device (4), the tightening device (4) includes a tightening ring (401), a one-way lock buckle (402) and a plastic chain (403); the outer periphery of the tightening ring (401) is provided with an anti-skid gear (404), the plastic chain (403) connected with the tightening ring (401) is driven by rotating the tightening ring (401), and the other end of the plastic chain (403) is fixedly connected with the clamping piece (3); when the plastic chain (403) slides, the radius size of the clamping piece (3) is reduced, the two vertical gaps (301) are continuously reduced, and the clamping piece is realized; the one-way lock buckle (402) is used in the sliding process of the plastic chain (403), so that only one-way sliding is generated, the one-way lock buckle (402) is locked, and the clamping piece (3) is fixed.

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