Connection and tensioning method for steel strand

Abstract

The present invention relates to a connection and tensioning method for steel stranded wires, which comprises the following steps: providing a connecting piece, fixing the connecting piece to the end of the first steel stranded wire, and threading the second steel stranded wire through the U-shaped groove; pouring to form a concrete layer, such that the first steel stranded wire and the second steel stranded wire are embedded in the concrete layer and a notch is formed at the position of the concrete layer corresponding to the connecting piece to expose the tensioning end of the second steel stranded wire; providing an anchor piece, installing the anchor piece at the tensioning end of the second steel stranded wire and clamping it in the clamping groove, using a jack to tension the tensioning end of the second steel stranded wire, further shortening the part of the second steel stranded wire exposed from the connecting piece, and filling the notch with concrete. The present invention effectively solves the problem that it is relatively difficult to simultaneously achieve the connection and tensioning of steel stranded wires. On the basis of connecting two adjacent steel stranded wires, it can achieve the anchoring and tensioning of the steel stranded wires, improve the utilization rate of ultra-high-strength and slow-bonding prestressed steel stranded wires, reduce the construction cost, and improve the construction efficiency.

Description

Technical Field

[0001] The present invention relates to the field of construction, and particularly to a connection and tensioning method for steel strands. Background Art

[0002] Slow-bonded prestressed steel strands are widely used in the structural construction design of bridges, airports, stadiums, etc. due to their high strength, high toughness, good relaxation performance, etc.

[0003] At present, high-strength slow-bonded prestressed steel strands are widely used and the technology is relatively mature. However, there are few related applications for ultra-high-strength slow-bonded prestressed steel strands above 2000 MPa. At present, it is difficult to realize a device for tensioning steel strands on the basis of connecting adjacent two steel strands, and the construction cost is relatively high and the efficiency is relatively low. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a connection and tensioning method for steel strands, which solves the problem that it is relatively difficult to simultaneously realize the connection and tensioning of steel strands. On the basis of connecting adjacent two steel strands, it can realize the anchoring and tensioning of steel strands, improve the utilization rate of ultra-high-strength slow-bonded prestressed steel strands, reduce the construction cost, and improve the construction efficiency.

[0005] The technical solution for realizing the above purpose is as follows:

[0006] The present invention provides a connection and tensioning method for steel strands to connect a first steel strand and a second steel strand to be tensioned, including the following steps:

[0007] Provide a connecting piece, fixedly open a U-shaped groove at the top of the connecting piece, and open a clamping groove on the inner wall of the U-shaped groove. Fix the connecting piece at the end of the first steel strand, and pass the second steel strand through the U-shaped groove;

[0008] Pour to form a concrete layer, so that the first steel strand and the second steel strand are buried in the concrete layer and a notch is formed at the position of the concrete layer corresponding to the connecting piece to expose the tensioning end of the second steel strand;

[0009] Provide an anchor piece, install the anchor piece at the tensioning end of the second steel strand and clamp it in the clamping groove, use a jack to tension the tensioning end of the second steel strand, and then stage the part of the second steel strand exposed from the connecting piece, and use concrete to fill the notch.

[0010] The connection and tensioning method for steel stranded wires of the present invention is as follows: by using a connecting piece to connect the first steel stranded wire and the second steel stranded wire, and then pouring to form a concrete layer, a jack is used to tension the second steel stranded wire. After tensioning, since the anchor is clamped in the clamping groove, the second steel stranded wire can be fixed to prevent it from retracting. Finally, the reserved notch is filled with concrete. This not only realizes the connection of the first steel stranded wire and the second steel stranded wire, but also can realize the tensioning of the second steel stranded wire, solves the problem that it is difficult to simultaneously realize the connection and tensioning of steel stranded wires, and can realize the anchoring and tensioning of steel stranded wires on the basis of connecting adjacent two steel stranded wires, improves the utilization rate of ultra-high-strength and slow-bonded prestressed steel stranded wires, reduces the construction cost, and improves the construction efficiency.

[0011] A further improvement of the connection and tensioning method for steel stranded wires of the present invention lies in that the U-shaped groove includes a first groove section far from the second steel stranded wire and a second groove section close to the second steel stranded wire. The width of the first groove section is greater than that of the second groove section. The clamping groove is opened in the second groove section, and an opening communicating with the first groove section is formed at one end of the clamping groove.

[0012] Insert the anchor from the opening into the clamping groove, then abut the end of the jack against the anchor and tension the second steel stranded wire. After tensioning in place, the anchor is clamped in the clamping groove to fixedly connect the second steel stranded wire and the first steel stranded wire.

[0013] A further improvement of the connection and tensioning method for steel stranded wires of the present invention lies in that the width of the second groove section matches the diameter of the second steel stranded wire.

[0014] A further improvement of the connection and tensioning method for steel stranded wires of the present invention lies in that the width of the clamping groove is greater than that of the second groove section, so as to prevent the anchor from slipping out of the notch of the U-shaped groove.

[0015] A further improvement of the connection and tensioning method for steel stranded wires of the present invention lies in that the anchor includes a sleeve and several wedge-shaped clamping pieces.

[0016] The sleeve is sleeved on the tensioning end of the second steel stranded wire, and then several clamping pieces are inserted between the sleeve and the second steel stranded wire so that the second steel stranded wire is clamped in the sleeve, and thus the anchor is fixed to the second steel stranded wire.

[0017] A further improvement of the connection and tensioning method for steel stranded wires of the present invention lies in that the clamping pieces are inserted at the end of the sleeve close to the first groove section.

[0018] A further improvement of the connection and tensioning method for steel stranded wires of the present invention lies in that before pouring to form the concrete layer, it further includes:

[0019] A spiral reinforcement is sleeved at the positions of the first steel stranded wire and the second steel stranded wire close to the connecting piece.

[0020] A further improvement of the connection and tensioning method for steel strands in the present invention lies in that when fixing the connecting piece to the end of the first steel strand, it further includes:

[0021] A through hole is opened in the connecting piece, the first steel strand is passed through the through hole, and an extrusion anchor is fixed at the protruding end of the first steel strand, thereby connecting the first steel strand and the connecting piece.

[0022] A further improvement of the connection and tensioning method for steel strands in the present invention lies in that the diameter of the extrusion anchor is larger than the diameter of the through hole.

[0023] A further improvement of the connection and tensioning method for steel strands in the present invention lies in that it further includes a support plate vertically fixed to the bottom of the connecting piece;

[0024] The support plate is placed on the top of the steel bar below the first steel strand. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view of the use state of the connection and tensioning method for steel strands in the present invention.

[0026] Figure 2 is a top view of the use state of the connection and tensioning method for steel strands in the present invention.

[0027] Figure 3 is a schematic diagram during the construction of the concrete layer in the connection and tensioning method for steel strands in the present invention.

[0028] Figure 4 is a three-dimensional exploded schematic diagram of the connection and tensioning method for steel strands in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Refer to Figure 1 , the present invention provides a connection and tensioning method for steel strands. By using a connecting piece to connect the first steel strand and the second steel strand, and then after pouring to form a concrete layer, a jack is used to tension the second steel strand. After tensioning, since the anchor is clamped in the clamping groove, the second steel strand can be fixed to prevent the second steel strand from retracting. Finally, the reserved gap is filled with concrete, which not only realizes the connection of the first steel strand and the second steel strand, but also can realize the tensioning of the second steel strand, solves the problem that it is difficult to simultaneously realize the connection and tensioning of steel strands, and on the basis of connecting adjacent two steel strands, can realize the anchoring and tensioning of steel strands, improves the utilization rate of ultra-high-strength slow-bonded prestressed steel strands, reduces the construction cost, and improves the construction efficiency. The connection and tensioning method for steel strands in the present invention will be described below with reference to the accompanying drawings.

[0031] Refer to Figure 1 ,Figure 1 This is the front view of the usage state of the connection and tensioning method for steel strands of the present invention. The following will be combined with Figure 1 , and the connection and tensioning method for steel strands of the present invention will be described.

[0032] As Figures 1 to 4 shown, the connection and tensioning method for steel strands of the present invention for connecting the first steel strand 21 and the second steel strand 22 to be tensioned includes the following steps:

[0033] Provide a connecting piece, fixedly open a U-shaped groove 121 at the top of the connecting piece, and open a clamping groove 122 on the inner wall of the U-shaped groove 121. Fix the connecting piece at the end of the first steel strand 21, and pass the second steel strand 22 through the U-shaped groove 121;

[0034] Pour to form a concrete layer 31, so that the first steel strand 21 and the second steel strand 22 are buried in the concrete layer 31 and a notch 311 is formed at the position of the concrete layer 31 corresponding to the connecting piece to expose the tensioning end of the second steel strand 22;

[0035] Provide an anchor, install the anchor at the tensioning end of the second steel strand 22 and clamp it in the clamping groove 122, use a jack to tension the tensioning end of the second steel strand 22, and then stage the part of the second steel strand 22 exposed from the connecting piece, and use concrete to fill the notch 311.

[0036] Specifically, the connecting piece includes a base 11 and a fixing block 12 located at the top of the base 11. The base 11 is provided with a through hole 112 for the first steel strand 21 to pass through, and the U-shaped groove 121 is opened at the top of the fixing block 12.

[0037] Furthermore, when fixing the connecting piece to the end of the first steel strand 21, it further includes:

[0038] Open a through hole 112 in the connecting piece, pass the first steel strand 21 through the through hole 112, and fixedly press an extrusion anchor 14 at the protruding end of the first steel strand 21, thereby connecting the first steel strand 21 and the connecting piece.

[0039] Preferably, the diameter of the extrusion anchor 14 is larger than the diameter of the through hole 112.

[0040] Specifically, it further includes a support plate 111 vertically fixed to the bottom of the connecting piece;

[0041] Place the support plate 111 on the top of the steel bar below the first steel strand 21.

[0042] As a preferred embodiment of the present invention, the U-shaped groove 121 includes a first groove section 1211 away from the second steel strand 22 and a second groove section 1212 close to the second steel strand 22. The width of the first groove section 1211 is greater than that of the second groove section 1212. The clamping groove 122 is formed in the second groove section 1212, and an opening communicating with the first groove section 1211 is formed at one end of the clamping groove 122.

[0043] Insert the anchor from the opening into the clamping groove 122, then press the end of the jack against the anchor and tension the second steel strand 22. After the tensioning is in place, the anchor is clamped in the clamping groove 122 to fixedly connect the second steel strand 22 and the first steel strand 21.

[0044] Preferably, the width of the second groove section 1212 matches the diameter of the second steel strand 22.

[0045] Specifically, the width of the clamping groove 122 is greater than that of the second groove section 1212, so as to prevent the anchor from slipping out of the notch of the U-shaped groove 121.

[0046] Furthermore, the anchor includes a sleeve 13 and a plurality of wedge-shaped clamping pieces 131.

[0047] The sleeve 13 is sleeved on the tensioning end of the second steel strand 22, and then a plurality of clamping pieces 131 are inserted between the sleeve 13 and the second steel strand 22, so that the second steel strand 22 is clamped in the sleeve 13, and thus the anchor is fixed to the second steel strand 22.

[0048] Preferably, the clamping pieces 131 are inserted into the end of the sleeve 13 close to the first groove section 1211.

[0049] Furthermore, before pouring the concrete layer 31, it further includes:

[0050] A spiral reinforcement 15 is sleeved on the first steel strand 21 and the second steel strand 22 near the connecting piece.

[0051] The specific implementation method of the present invention is as follows:

[0052] Install the extrusion anchor 14 at the end of the first steel strand 21, pass the first steel strand 21 through the through hole 112 of the base 11, and the extrusion anchor 14 abuts against the end of the base 11, so as to prevent the first steel strand 21 from slipping out of the through hole 112, and a spiral reinforcement 15 is sleeved on the part of the first steel strand 21 exposed from the base 11;

[0053] The second steel strand 22 is clamped into the U-shaped groove 121, and a spiral reinforcement 15 is sleeved on the part of the second steel strand 22 exposed from the fixing block 12. At this time, the first steel strand 21 and the second steel strand 22 are connected;

[0054] Place the support plate 111 on the top of the steel bars below the first steel strand 21, and pour to form a concrete layer 31, so that the first steel strand 21 and the second steel strand 22 are embedded in the concrete layer 31, and a notch 311 is formed at the tension end of the second steel strand 22 and at the part of the fixing block 12 to expose the tension end of the second steel strand 22. Sleeve 13 is sleeved on the end of the second steel strand 21, and wedge-shaped keys 131 are inserted between the sleeve 13 and the second steel strand 22, and the sleeve 13 is inserted into the clamping groove 122 from the opening of the clamping groove 122, so that the second steel strand 22 will not protrude outwards from the notch of the U-shaped groove 121;

[0055] Use a jack to tension the tension end of the second steel strand 22. The jack abuts against the wedge-shaped keys 131 and the sleeve 13 to prevent the sleeve 13 from protruding outwards from the opening of the clamping groove 122. After tensioning, the wedge-shaped keys 131 and the sleeve 13 fix the second steel strand 22, and at this time, the tensioning of the second steel strand 22 is realized;

[0056] Cut off the redundant part of the second steel strand 22 extending out of the fixing block 12, and then fill the notch 311 with concrete to level the notch 311, so that the second steel strand 22 and the fixing block 12 are both embedded in the concrete layer 31.

[0057] The present invention has been described in detail above in conjunction with the embodiments with reference to the drawings. Those of ordinary skill in the art can make various variations to the present invention according to the above description. Therefore, some details in the embodiments should not constitute a limitation to the present invention, and the protection scope of the present invention will be defined by the scope defined in the appended claims.

Claims

1. A connection and tensioning method for steel strand wires, used to connect a first steel strand wire and a second steel strand wire to be tensioned, characterized in that, It includes the following steps: Provide a connecting piece, fixedly open a U-shaped groove at the top of the connecting piece, and open a clamping groove on the inner wall of the U-shaped groove. Fix the connecting piece at the end of the first steel strand, and pass the second steel strand through the U-shaped groove; Pour to form a concrete layer, so that the first steel strand and the second steel strand are buried in the concrete layer, and a notch is formed in the concrete layer corresponding to the position of the connecting piece to expose the tensioning end of the second steel strand; Provide an anchor, install the anchor at the tensioning end of the second steel strand and clamp it in the clamping groove. Use a jack to tension the tensioning end of the second steel strand, and then cut off the part of the second steel strand exposed outside the connecting piece, and fill the notch with concrete; The U-shaped groove includes a first groove section away from the second steel strand and a second groove section close to the second steel strand. The width of the first groove section is greater than the width of the second groove section. The clamping groove is opened in the second groove section, and an opening communicating with the first groove section is formed at one end of the clamping groove; Insert the anchor into the clamping groove from the opening, and then abut the end of the jack against the anchor and tension the second steel strand. After the tensioning is in place, the anchor is clamped in the clamping groove to fixedly connect the second steel strand and the first steel strand; The anchor includes a sleeve and several wedge-shaped clamping pieces; Set the sleeve on the tensioning end of the second steel strand, and then insert several clamping pieces between the sleeve and the second steel strand, so that the second steel strand is clamped in the sleeve, thereby fixing the anchor to the second steel strand.

2. The connection and tensioning method for steel strand wires according to claim 1, characterized in that, The width of the second groove section matches the diameter of the second steel strand.

3. The connection and tensioning method for steel strand wires as claimed in claim 1, wherein, The width of the clamping groove is greater than the width of the second groove section, so as to prevent the anchor from slipping outwards from the notch of the U-shaped groove.

4. The joining and tensioning method for steel strand according to claim 1, wherein The clamping pieces are inserted into the end of the sleeve close to the first groove section.

5. The connection and tensioning method for steel strand according to claim 1, characterized in that, Before pouring to form the concrete layer, it further includes: Set a spiral reinforcement around the first steel strand and the second steel strand close to the connecting piece.

6. The connection and tensioning method for steel strand wires according to claim 1, characterized in that, When fixing the connecting piece at the end of the first steel strand, it further includes: Open a through hole in the connecting piece, pass the first steel strand through the through hole, and fixedly install a swaged anchor at the extending end of the first steel strand, thereby connecting the first steel strand and the connecting piece.

7. The connecting and tensioning method for steel strand according to claim 6, characterized in that, The diameter of the swaged anchor is greater than the diameter of the through hole.

8. The connecting and tensioning method for steel stranded wires according to claim 1, characterized in that, It further includes a support plate vertically fixed to the bottom of the connecting piece; Place the support plate on the top of the steel bar under the first steel strand.

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