Construction engineering prestressed part tensioning equipment

Abstract

The invention relates to the technical field of constructional engineering, and discloses constructional engineering prestressed part tensioning equipment which comprises an anchoring plate, the anchoring plate is in threaded sleeving connection with a threaded plate through a threaded hole, the anchoring plate is movably in sleeving connection with a smooth plate through the threaded hole, and the front end of a clamping piece is movably in sleeving connection with the threaded plate. The rear end of the clamping piece is fixedly connected with the smooth plate in a sleeved mode, and the limiting piece is movably arranged between the threaded plate and the smooth plate. During tensioning, the inner rings of the clamping pieces do not make contact with the outer wall of the steel strand, the situation that the clamping pieces and the steel strand are abraded due to continuous friction is effectively prevented, the threaded plate and the smooth plate are attached through the limiting rods and the limiting blocks after tensioning and before unwinding, the clamping pieces are pushed to be completely connected into the main through hole in a sleeved mode, and the clamping pieces are prevented from being damaged. The clamping piece and the steel strand are clamped and fixed, the stable clamping effect between the clamping piece and the steel strand is achieved in the withdrawing process, and the problem that the steel strand retracts due to the fact that the steel strand cannot be clamped and fixed, and the design requirement is difficult to meet due to prestress loss is effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of construction engineering, and particularly relates to a tensioning device for prestressed components in construction engineering. Background Art

[0002] In construction engineering, in order to avoid the premature appearance of cracks in reinforced concrete structures and make full use of high-strength steel and high-strength concrete, prestressed concrete components have been created in long-term production practice. A so-called prestressed concrete component refers to a structure in which prestressing tendons (steel strands / bundles) are configured in a concrete component, and prestress is established through a tensioning device to reduce or offset the tensile stress caused by external loads. That is, it makes use of the relatively high compressive strength of concrete to make up for its lack of tensile strength, achieving the purpose of delaying the cracking of concrete in the tensile zone.

[0003] The construction technology of prestressed concrete includes the pre-tensioning method and the post-tensioning method. Among them, a post-tensioned prestressed concrete component refers to a concrete component in which prestressing tendons are tensioned and anchored with anchor fittings after the strength of the poured concrete reaches the design value. The tensioning device mainly consists of a jack, an electric oil pump, a corrugated pipe, anchor fittings, etc. A jack is used to tension the prestressing tendons, and anchor fittings are used to fix the tensioned prestressing tendons, so that the required prestress can be obtained.

[0004] However, there are still some defects in the existing tensioning devices during use: The anchor fitting is pushed into the pipe orifice sleeved with the prestressing tendon to form a clamping of the prestressing tendon, so as to achieve the purpose of fixing the prestressing tendon. However, during the tensioning process, the prestressing tendon will continuously rub against the wedge in the anchor fitting, which is likely to cause wear of the wedge that engages with the prestressing tendon. Therefore, during the retraction process, the wedge cannot firmly fix and clamp the prestressing tendon, resulting in the retraction of the prestressing tendon. As a result, the prestress will be lost due to the retraction of the prestressing tendon, especially when the length of the prestressing tendon is relatively small, its retraction amount is particularly obvious, and finally it is difficult to meet the design requirements for the applied prestress. Summary of the Invention

[0005] This application provides a tensioning device for prestressed components in construction engineering, which has the advantages of effectively preventing the steel strand from rubbing against the wedge during tensioning, reducing the surface wear of both, thereby improving the clamping and fixing effect of both during retraction, reducing the retraction amount of the steel strand, and preventing prestress loss, so as to solve the problem that the wedge cannot firmly fix and clamp the steel strand, resulting in the retraction of the wedge and thus the prestress loss is difficult to meet the design requirements.

[0006] To achieve the above object, this application adopts the following technical solution: A tensioning device for prestressed components in construction engineering, comprising: An anchor connecting plate, the anchor connecting plate is composed of a square plate and a circular plate, and the circular plate is fixedly sleeved in the middle of the square plate, and a threaded hole is opened in the middle of the circular plate; Threaded plate, the anchoring plate is threadedly sleeved with the threaded plate through a threaded hole; Smooth plate, the anchoring plate is movably sleeved with the smooth plate through a threaded hole, and the smooth plate is located behind the threaded plate; Steel strand, a main through hole is provided on the threaded plate, and an auxiliary through hole is provided on the smooth plate, and the steel strand passes through the main through hole and the auxiliary through hole; Wedge-shaped clip, the wedge-shaped clip includes a fixed block and a fixed film, a fixed film is fixedly connected between two adjacent fixed blocks, the front ends of the fixed block and the fixed film are both movably sleeved with the main through hole of the threaded plate, the rear end of the fixed block is attached to the side wall of the smooth plate, an auxiliary groove is provided on the smooth plate outside the auxiliary through hole, and the rear end of the fixed film is fixedly sleeved with the auxiliary groove of the smooth plate; Limiting member, the limiting member includes a limiting rod and a limiting block, connecting holes are provided on both the threaded plate and the smooth plate, and both ends of the limiting rod are movably clamped with two symmetrically arranged connecting holes respectively, two upper and lower limiting rods are arranged inside one limiting member, a limiting block is movably clamped between the two upper and lower limiting rods, and the limiting block is located between the threaded plate and the smooth plate during tensioning, and the limiting block is located behind the smooth plate during relaxation; The distance between the threaded plate and the smooth plate at each time period is controlled by the limiting member, so that the wedge-shaped clip is not in contact with the steel strand during tensioning, and the wedge-shaped clip is engaged with the steel strand during relaxation.

[0007] Further, the main through hole is in the shape of a frustum of a cone with a narrow front and a wide rear, and the auxiliary through hole is in the shape of a cylinder, and the minimum hole diameters of the main through hole and the auxiliary through hole are both larger than the diameter of the steel strand.

[0008] Further, the number of the wedge-shaped clips is several, and several wedge-shaped clips are evenly arranged around the center of the threaded plate or the smooth plate, the wedge-shaped clips are movably sleeved outside the steel strand, and the wedge-shaped clip further includes: The outer wall of the fixed block is attached to the inner wall of the main through hole, the number of the fixed blocks is four, and the four fixed blocks are evenly arranged around the center of the main through hole or the auxiliary through hole.

[0009] Further, the number of the limiting members is two, and the two limiting members are located on the left and right sides of the threaded plate or the smooth plate.

[0010] Further, the opposite faces of the threaded plate and the smooth plate have opposite magnetisms.

[0011] Further, the threaded plate, the smooth plate, the clamping piece and the limiting piece form a clamping assembly. Two clamping assemblies are linearly arranged in the anchor plate, and the two clamping assemblies form a set of clamping assemblies. The anchor plate and a set of clamping assemblies form an anchor mechanism, and there is an anchor mechanism at each end of the steel strand. On the clamping assembly located at the rear end of the anchor plate, a threaded ring is fixedly connected to the middle of the side of the smooth plate away from the threaded plate.

[0012] By arranging a set of clamping assemblies in the anchor plate, and a set of clamping assemblies is composed of two clamping assemblies arranged linearly, the two ends of the steel strand can be anchored twice at the same time, effectively enhancing the stable clamping effect between the steel strand and the clamping piece. After cutting off the redundant steel strand and before sealing the end, control the clamping assembly located at the rear end of the anchor plate to move spirally towards the front end of the anchor plate, so as to effectively perform a rotating winding operation on multiple steel strands, and change the multiple steel strands between the two clamping assemblies from a parallel state to a winding state, thereby further enhancing the stable clamping effect between the steel strand and the clamping piece, and further solving the problem that the steel strand retracts due to inability to be clamped and fixed, resulting in prestress loss and difficulty in meeting the design requirements.

[0013] Further, the clamping assembly further includes: A gas guiding member. Side holes are opened on the left and right sides of the circular plate outside the square plate of the anchor plate, and the gas guiding member is fixedly embedded in the smooth plate.

[0014] Further, the gas guiding member includes: A gas guiding ring. A gas guiding ring is arranged behind each clamping piece, and the gas guiding ring is circular; A gas guiding pipe. Adjacent gas guiding rings are fixedly connected through the gas guiding pipe; An air inlet pipe. The number of the air inlet pipes is two, and one end of the air inlet pipe is fixedly connected to one of the gas guiding rings; An air outlet pipe. An air outlet pipe is fixedly connected to one side of the gas guiding ring, and the air outlet pipe is communicated with the fixing film. A plurality of small air holes are opened on the inner side wall surface of the fixing film.

[0015] By arranging a clamping assembly inside the anchoring plate, the clamping assembly further includes a gas guiding member embedded in the smooth plate, and the gas guiding member is composed of a gas guiding ring, a gas guiding pipe, an air inlet pipe and an air outlet pipe. During assembly, since the air outlet pipe is arranged on the smooth plate located in the auxiliary groove, the fixing film is communicated with the air outlet pipe. Thus, during tensioning, the electric air pump conveys gas to the gas guiding member to apply an expansion force to the fixing film to achieve full expansion of the fixing film, thereby pushing the fixing block to fit against the inner wall of the main through hole, further realizing that the inner circle of the clamping piece does not contact the outer wall of the steel strand, further preventing continuous friction between the clamping piece and the steel strand and causing wear of both. In addition, since small air holes are provided in the inner circle of the fixing film, it effectively promotes the discharge of excess gas inside the fixing film, thereby precisely blowing and cooling the clamping piece and the steel strand, effectively preventing heat accumulation of the steel strand during tensioning and causing a reduction in the quality or even damage of the steel strand and the clamping piece.

[0016] Furthermore, it further includes: A concrete member, with end grooves opened at both ends of the concrete member, and the end grooves of the concrete member are movably connected to the anchor mechanism through bolts; A connecting mechanism, with the connecting mechanism movably arranged inside the concrete member.

[0017] Furthermore, the connecting mechanism includes: A corrugated pipe, with the corrugated pipe movably sleeved inside the concrete member; A guiding pipe, with guiding pipes fixedly sleeved at both ends of the corrugated pipe respectively, and the guiding pipes are in contact with the anchoring plate, and the steel strand movably passes through the corrugated pipe and the guiding pipe; A spiral reinforcement, with the spiral reinforcement fixedly sleeved outside the guiding pipe, and the spiral reinforcement is located on one side of the anchoring plate; A communicating pipe, with one end of the communicating pipe fixedly communicated with the top end of the corrugated pipe, and the other end of the communicating pipe passes through the inside of the concrete member; A feeding member, with one of the guiding pipes fixedly communicated with the top end of the feeding member, and the feeding member passes through the anchoring plate.

[0018] The beneficial effects of the present invention are as follows: A tensioning device for prestressed components in construction engineering provided by the present application. By arranging a clamping assembly inside the anchor plate, the clamping assembly includes a threaded plate, a smooth plate, clamping pieces and a limiting member. The clamping pieces are composed of a fixed block and a fixed film, and the limiting member is composed of a limiting rod and a limiting block. During assembly, the front ends of the fixed block and the fixed film are movably sleeved in the main through hole of the threaded plate, the rear end of the fixed film is fixedly sleeved in the auxiliary groove of the smooth plate, and the threaded plate and the smooth plate are separated by the limiting rod and the limiting block, so that the clamping pieces are not completely sleeved in the main through hole, and the fixed block is attached to the inner wall of the main through hole under the elastic expansion of the fixed film. Thus, during tensioning, the inner ring of the clamping piece does not contact the outer wall of the steel strand, effectively preventing the clamping piece and the steel strand from continuously rubbing against each other and causing wear to both. After tensioning and before retracting the tension, the threaded plate and the smooth plate are attached by the limiting rod and the limiting block, so that the clamping pieces are pushed to be completely sleeved in the main through hole, realizing the clamping and fixing of the clamping pieces and the steel strand. During retracting the tension, the stable clamping effect between the clamping piece and the steel strand effectively solves the problem that the steel strand retracts due to the inability to be clamped and fixed, resulting in prestress loss and difficulty in meeting the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings: Figure 1 The overall three-dimensional structure diagram in the present invention; Figure 2 The overall three-dimensional structure diagram of the present invention located in the cross-section of the concrete member; Figure 3 The overall cross-sectional three-dimensional structure diagram in the present invention; Figure 4 In the present invention Figure 3 The enlarged structure diagram at A; Figure 5 The three-dimensional structure diagram of the steel strand, the connecting mechanism and the anchoring mechanism in the present invention; Figure 6 The three-dimensional structure diagram of the steel strand and the connecting mechanism in the present invention; Figure 7 The cross-sectional three-dimensional structure diagram of the steel strand and the connecting mechanism in the present invention; Figure 8 The three-dimensional structure diagram of the steel strand and the anchoring mechanism in the present invention; Figure 9 The cross-sectional three-dimensional structure diagram of the steel strand and the anchoring mechanism in the present invention; Figure 10 The three-dimensional structure diagram of a set of clamping assemblies in the present invention; Figure 11 Schematic exploded three-dimensional view of a clamping assembly without a threaded ring in the present invention; Figure 12 Schematic sectional three-dimensional view of a clamping assembly without a threaded ring at the fixed film in the present invention; Figure 13 Schematic sectional three-dimensional view of a smooth plate, a threaded ring and an air guide member in the present invention; Figure 14 Schematic sectional three-dimensional view of a limiting member in the present invention; Figure 15 Schematic three-dimensional view of a clamping piece in the present invention; Figure 16 Schematic three-dimensional view of an air guide member in the present invention; Figure 17 Schematic three-dimensional view of a clamping piece and an air guide member in the present invention.

[0020] In the figure: 1, concrete member; 2, steel strand; 3, connecting mechanism; 31, corrugated pipe; 32, guiding pipe; 33, spiral rib; 34, communicating pipe; 35, feeding member; 4, anchorage mechanism; 41, anchoring plate; 42, threaded plate; 43, smooth plate; 44, threaded ring; 5, clamping piece; 51, fixing block; 52, fixing film; 6, air guide member; 61, air guide ring; 62, air guide pipe; 63, air inlet pipe; 64, air outlet pipe; 7, limiting member; 71, limiting rod; 72, limiting block. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1, a tensioning device for prestressed members in construction engineering, including a concrete member 1, such as Figures 1 - 3 , the concrete member 1 is composed of concrete and a steel bar framework. The forming process of the concrete member 1 is as follows: First, place the steel bar framework in the mold, then pour the concrete into the mold. After the strength of the poured concrete reaches the design value, remove the mold.

[0023] Such as Figures 2 - 3 , before pouring the concrete, a connecting mechanism 3 is movably arranged inside the concrete member 1, and the steel strand 2 passes through the connecting mechanism 3 to assist in arranging the steel strand 2 inside the concrete member 1. The connecting mechanism 3 includes a corrugated pipe 31, a guiding pipe 32, a spiral rib 33, a communicating pipe 34 and a feeding member 35, such as Figures 5 - 7, a corrugated pipe 31 is movably sleeved inside a concrete member 1. Guide pipes 32 are fixedly sleeved at both ends of the corrugated pipe 31, and the guide pipes 32 are in contact with the anchoring plate 41. The steel strand 2 movably passes through the corrugated pipe 31 and the guide pipes 32. That is, the corrugated pipe 31 and the guide pipes 32 are embedded in the concrete member 1 to form a duct for the steel strand 2 to pass through. A spiral reinforcement 33 is fixedly sleeved outside the guide pipe 32, and the spiral reinforcement 33 is located on one side of the anchoring plate 41, which is used to enhance the local bearing capacity of the concrete member 1, restrain the deformation of the concrete, improve the stress distribution, and improve the fatigue resistance. The top end of the corrugated pipe 31 is fixedly connected to one end of a connecting pipe 34, and the other end of the connecting pipe 34 passes through the inside of the concrete member 1. The top end of one of the guide pipes 32 is fixedly connected to a feeding member 35, and the feeding member 35 passes through the anchoring plate 41. Before sealing the end, the corrugated pipe 31 and the spiral reinforcement 33 are filled with concrete through the feeding member 35, and the connecting pipe 34 is used to detect whether the inside of the corrugated pipe 31 and the spiral reinforcement 33 is completely filled.

[0024] As Figures 2 - 5 , end grooves are provided at both ends of the concrete member 1, and the end grooves of the concrete member 1 are movably connected to the anchor mechanism 4 through bolts. That is, the number of the anchor mechanisms 4 is two, and the steel strand 2 passes through the anchor mechanism 4, which effectively helps to anchor the steel strand 2. One anchor mechanism 4 is composed of an anchoring plate 41 and a set of clamping components. Two clamping components are linearly arranged in the anchoring plate 41, and the two clamping components form a set of clamping components. After tensioning, with the design of a set of clamping components, the two ends of the steel strand 2 can be anchored simultaneously. The threaded plate 42, the smooth plate 43, the wedge-shaped clamp 5 and the limiting member 7 form a clamping component. Specifically, as Figures 8 - 11 , the anchoring plate 41 is composed of a square plate and a circular plate, and the circular plate is fixedly sleeved in the middle of the square plate. A threaded hole is provided in the middle of the circular plate of the anchoring plate 41. The shape setting of the anchoring plate 41 effectively provides conditions for the stable installation of the clamping components. The anchoring plate 41 is threadedly sleeved with the threaded plate 42 through the threaded hole, so that the threaded plate 42 can be disassembled and installed on the anchoring plate 41 by rotation. The anchoring plate 41 is movably sleeved with the smooth plate 43 through the threaded hole, and the smooth plate 43 is located behind the threaded plate 42, so that the smooth plate 43 can be disassembled and installed on the anchoring plate 41 by horizontal movement. As Figure 13, a main through - hole is provided on the threaded plate 42, and an auxiliary through - hole is provided on the smooth plate 43. The steel strand 2 passes through the main through - hole and the auxiliary through - hole, effectively limiting the state of the steel strand 2 between the threaded plate 42 and the smooth plate 43, thereby helping to improve the stability of the steel strand 2 when it is subsequently arranged in the anchor mechanism 4. The main through - hole is in the shape of a frustum of a cone with a narrow front and a wide rear, and the auxiliary through - hole is cylindrical. The minimum diameters of the main through - hole and the auxiliary through - hole are both larger than the diameter of the steel strand 2, effectively reducing the wear of the steel strand 2 and the threaded plate 42 and the smooth plate 43 during tensioning. The steel strand 2 has a standard 1*7 structure (1 straight core wire + 6 helically wound wires), so the cross - section of the steel strand 2 is a closely wound helix. On the clamping assembly at the rear end of the anchor plate 41, in the middle of the side of the smooth plate 43 away from the threaded plate 42, a threaded ring 44 is fixedly connected. After cutting off the excess steel strand 2 and before sealing the end, by means of the threaded ring 44, one clamping assembly located at the rear end of the anchor plate 41 can be controlled to move helically towards the front end of the anchor plate 41, thereby effectively performing a rotating winding operation on multiple steel strands 2, changing the multiple steel strands 2 between the two clamping assemblies from a parallel state to a wound state, and further enhancing the stable clamping effect between the steel strand 2 and the wedge - shaped clamp 5.

[0025] As Figures 11 - 12 , Figure 15 , the front end of the wedge - shaped clamp 5 is movably sleeved on the threaded plate 42, and the rear end of the wedge - shaped clamp 5 is fixedly sleeved on the smooth plate 43, which is used to clamp and fix the tensioned steel strand 2 to obtain the required prestress.

[0026] As Figures 11 - 12 , Figure 14 , the limiting member 7 is movably arranged between the threaded plate 42 and the smooth plate 43. It is used to ensure that the threaded plate 42 and the smooth plate 43 can rotate synchronously, achieving relative rest in the radial direction between the threaded plate 42 and the smooth plate 43, and is also used to control the axial distance between the threaded plate 42 and the smooth plate 43, achieving relative movement in the axial direction between the threaded plate 42 and the smooth plate 43.

[0027] Jack and electric oil pump. Both ends of the steel strand 2 are movably connected to jacks, and the jacks are connected to the electric oil pump. The electric oil pump can be used to drive the jacks to work, so that the steel strand 2 can be tensioned to generate prestress on the concrete member 1 and improve the compressive strength of the concrete member 1 during its later use.

[0028] By using the limiting member 7 to control the distance between the threaded plate 42 and the smooth plate 43 at each time period, it is realized that the wedge - shaped clamp 5 does not contact the steel strand 2 during tensioning, and the wedge - shaped clamp 5 engages with the steel strand 2 during relaxation. Thus, it effectively prevents the wedge - shaped clamp 5 and the steel strand 2 from continuously rubbing during tensioning and causing wear to both, enhances the stable clamping effect between the wedge - shaped clamp 5 and the steel strand 2 during relaxation, and solves the problem that the steel strand 2 retracts due to inability to be clamped and fixed, resulting in prestress loss and difficulty in meeting the design requirements.

[0029] Example 2. On the basis of Example 1, as Figures 11 - 12 , the number of the wedge grips 5 is several, and several wedge grips 5 are evenly arranged around the center of the threaded plate 42 or the smooth plate 43. The wedge grips 5 are movably sleeved outside the steel strand 2, so that a plurality of steel strands 2 clamped and fixed with the wedge grips 5 are in a parallel state during tensioning, realizing stable tensioning of the plurality of steel strands 2. The wedge grip 5 includes a fixed block 51 and a fixed film 52, as Figure 15 , the front end of the fixed block 51 is movably sleeved with the main through hole of the threaded plate 42, and the outer wall of the fixed block 51 fits with the inner wall of the main through hole. The inner wall of the fixed block 51 does not contact the outer wall of the steel strand 2 during tensioning, and engages with the inner wall of the steel strand 2 during relaxation. The rear end of the fixed block 51 fits with the side wall of the smooth plate 43, so that the fixed block 51 will be pushed by the smooth plate 43 to move along the main through hole of the threaded plate 42, thereby controlling whether the fixed block 51 engages and fixes with the steel strand 2. The number of the fixed blocks 51 is four, and the four fixed blocks 51 are evenly arranged around the center of the main through hole or the auxiliary through hole, effectively ensuring the stability of the fixed block 51 engaging with the steel strand 2 in the radial direction. A fixed film 52 is fixedly connected between two adjacent fixed blocks 51. The front end of the fixed film 52 is movably sleeved with the main through hole of the threaded plate 42. An auxiliary groove is formed in the smooth plate 43 located outside the auxiliary through hole, and the smooth plate 43 is fixedly sleeved with the rear end of the fixed film 52 through the auxiliary groove. During assembly, the fixed film 52 is connected to the smooth plate 43 by glue, thereby ensuring the stability of the fixed film 52 arranged on the smooth plate 43, and at the same time facilitating the fixed film 52 to be pushed by the smooth plate 43 to move and deform along the main through hole of the threaded plate 42, so that the fixed film 52 will control whether the fixed block 51 engages and fixes with the steel strand 2. Specifically, when tensioning, since the fixed block 51 and the fixed film 52 are not completely sleeved in the main through hole of the threaded plate 42, the fixed block 51 is abutted under the elastic expansion of the fixed film 52 and only fits with the inner wall of the main through hole, effectively preventing continuous friction between the wedge grip 5 and the steel strand 2 and causing wear to both. When relaxing, since the fixed block 51 and the fixed film 52 are completely sleeved in the main through hole of the threaded plate 42, the fixed block 51 fits fully with the inner wall of the main through hole and the outer wall of the steel strand 2 under the pulling and contraction of the fixed film 52, effectively solving the problem that the steel strand 2 retracts due to inability to be clamped and fixed, resulting in prestress loss and difficulty in meeting the design requirements.

[0030] As Figures 11 - 12 , two limit members 7 are arranged in a clamping assembly, and the limit members 7 are located on the left and right sides of the threaded plate 42 or the smooth plate 43. The limit member 7 includes a limit rod 71 and a limit block 72, as Figure 14, a limiting member 7 is correspondingly provided with upper and lower limiting rods 71. The limiting rod 71 is composed of a rotating rod and a rotating bolt, and the rotating rod and the rotating bolt are helically sleeved with each other, so that the installation and disassembly between the two can be realized by rotation. Connecting holes are formed in both the threaded plate 42 and the smooth plate 43, and the connecting holes on the threaded plate 42 and the connecting holes on the smooth plate 43 are symmetrically arranged. The two ends of the limiting rod 71 are respectively movably clamped with the connecting holes of the threaded plate 42 and the connecting holes of the smooth plate 43. The limiting rod 71 can be used to realize the stable connection between the threaded plate 42 and the smooth plate 43. A limiting block 72 can be movably clamped between the upper and lower limiting rods 71. When tensioned, the limiting block 72 is located between the threaded plate 42 and the smooth plate 43, effectively separating the threaded plate 42 and the smooth plate 43, so as to provide conditions for the wedge 5 not to be engaged with the steel strand 2. When the tension is released, the limiting block 72 is located behind the smooth plate 43, effectively making the threaded plate 42 and the smooth plate 43 closely fit, so as to provide conditions for the wedge 5 to be fully engaged with the steel strand 2.

[0031] Embodiment 3, on the basis of Embodiment 2, as Figures 10 - 11 , the opposite faces of the threaded plate 42 and the smooth plate 43 have opposite magnetisms. When the threaded plate 42 and the smooth plate 43 do not need to be restricted and separated by the limiting block 72, the two can attract each other due to the magnetic force, so that the smooth plate 43 can move towards the threaded plate 42 to achieve full fit between the two, and further help the wedge 5 to be completely sleeved in the main through hole and fully clamp and fix the steel strand 2.

[0032] Embodiment 4, on the basis of Embodiment 3, the clamping assembly further includes an air guiding member 6, as Figures 11 - 12 , side holes are formed on the left and right sides of the circular plate outside the square plate of the anchor plate 41, which can not only monitor the states of various components in the anchor plate 41 in real time to facilitate the operation of the air guiding member 6 and the limiting member 7, but also help to fully fill the anchor mechanism 4 during subsequent sealing. The air guiding member 6 is fixedly embedded in the smooth plate 43, and the electric air pump passes through the side hole of the anchor plate 41 and is movably communicated with the air guiding member 6. When tensioned, the air guiding member 6 is used to convey gas to the wedge 5 to achieve various functions. The air guiding member 6 includes an air guiding ring 61, an air guiding pipe 62, an air inlet pipe 63 and an air outlet pipe 64, as Figures 16 - 17, a gas guide ring 61 is provided behind each clamping piece 5, and the gas guide ring 61 is circular. Adjacent two gas guide rings 61 are fixedly connected through a gas guide pipe 62. The number of air inlet pipes 63 is two, and one end of the air inlet pipe 63 is fixedly connected with one of the gas guide rings 61, and the other end of the air inlet pipe 63 is movably connected with an electric air pump. One side of the gas guide ring 61 is fixedly connected with an air outlet pipe 64, and the air outlet pipe 64 is communicated with the fixing film 52. When the electric air pump is started, gas can be evenly discharged into each fixing film 52 through the air inlet pipe 63, the gas guide ring 61, the gas guide pipe 62 and the air outlet pipe 64, so as to further expand the fixing film 52, so that the inner circle of the clamping piece 5 does not contact the outer wall of the steel strand 2, and further prevent the clamping piece 5 and the steel strand 2 from continuously rubbing against each other and causing wear to both.

[0033] Such as Figure 12 , a plurality of small air holes are formed on the inner side wall surface of the fixing film 52, which can timely discharge the excess gas after the fixing film 52 expands, so as to accurately blow and cool the clamping piece 5 and the steel strand 2, and effectively prevent the heat accumulation of the steel strand 2 during tensioning, resulting in the reduction of the quality of the steel strand 2 and the clamping piece 5 or even damage.

[0034] The working principle of the usage method of the present invention is as follows: Before pouring, place the steel bar frame in the mold, and bury the connecting mechanism 3 therein. Then pour the concrete into the mold. After the strength of the poured concrete reaches the designed value, a concrete member 1 is formed. Then remove the mold outside the concrete member 1, and then open end grooves on both sides of the concrete member 1, and install the anchor mechanism 4 in the end grooves of the concrete member 1 through bolts. At this time, the two clamping assemblies have been installed in the anchor plate 41, and there is a space interval between the two clamping assemblies. Then pass the steel strand 2 through the connecting mechanism 3 and the anchor mechanism 4.

[0035] When assembling the anchor plate 41 and the clamping assembly, first install the clamping piece 5. Actively install the front ends of the fixing block 51 and the fixing film 52 in the main through hole of the threaded plate 42, and fixedly install the rear end of the fixing film 52 in the auxiliary groove of the smooth plate 43. Then install the limiting member 7. Pass the two ends of the limiting rod 71 through the connection holes of the threaded plate 42 and the smooth plate 43 respectively. Then install the limiting block 72 between the upper and lower two limiting rods 71 located between the threaded plate 42 and the smooth plate 43, that is, use the limiting rod 71 and the limiting block 72 to separate the threaded plate 42 and the smooth plate 43, and the threaded plate 42 and the smooth plate 43 are kept relatively stationary, effectively making the clamping piece 5 not completely sleeved in the main through hole, and making the fixing block 51 fit with the inner wall of the main through hole under the elastic expansion of the fixing film 52, so as to reduce the friction between the steel strand 2 and the clamping piece 5 when the steel strand 2 passes through the clamping piece 5, and improve the protection between the two.

[0036] During tensioning, start the electric oil pump to drive the jack to work, thereby performing tensioning operations on both ends of the steel strand 2. Since the outer wall of the steel strand 2 does not contact the inner ring of the wedge grip 5 when the anchor mechanism 4 moves, it effectively prevents continuous friction between the wedge grip 5 and the steel strand 2, resulting in wear of both.

[0037] During the tensioning process, the electric air pump is started to supply gas to the air guide member 6, effectively applying an expansion force to the fixed film 52 to achieve full expansion of the fixed film 52, thereby pushing the fixed block 51 to fit against the inner wall of the main through hole, further ensuring that the inner ring of the wedge grip 5 does not contact the outer wall of the steel strand 2, and further preventing continuous friction between the wedge grip 5 and the steel strand 2, resulting in wear of both. Additionally, since small air holes are provided on the fixed film 52, it effectively promotes the discharge of excess gas inside the fixed film 52, thereby precisely blowing and cooling the wedge grip 5 and the steel strand 2, effectively preventing heat accumulation of the steel strand 2 during tensioning, which may cause a reduction in the quality or even damage of the steel strand 2 and the wedge grip 5.

[0038] After tensioning and before retracting, remove the limit block 72 through the side hole of the anchor plate 41 from between the two limit rods 71. At this time, there is no obstruction between the threaded plate 42 and the smooth plate 43, and they are fully fitted under the action of magnetic suction force, so that the wedge grip 5 is pushed to be completely sleeved inside the main through hole, achieving clamping and fixing of the wedge grip 5 and the steel strand 2. Then, install the limit block 72 between the upper and lower limit rods 71 located behind the smooth plate 43 to further ensure the stability between the threaded plate 42 and the smooth plate 43.

[0039] During retraction, the jack stops tensioning the steel strand 2. Due to the stable clamping effect between the wedge grip 5 and the steel strand 2, the retraction amount of the steel strand 2 is reduced compared to traditional tensioning equipment, effectively solving the problem that the steel strand 2 retracts due to inability to be clamped and fixed, resulting in prestress loss and difficulty in meeting the design requirements.

[0040] After retraction, first cut off the excess steel strand 2, and then use the threaded ring 44 to control the clamping assembly located at the rear end of the anchor plate 41 to move spirally towards the front end of the anchor plate 41, thereby effectively performing a rotating winding operation on multiple steel strands 2, changing the multiple steel strands 2 located between the two clamping assemblies from a parallel state to a wound state, further enhancing the stable clamping effect between the steel strand 2 and the wedge grip 5, and further solving the problem that the steel strand 2 retracts due to inability to be clamped and fixed, resulting in prestress loss and difficulty in meeting the design requirements. Then, use the feeding member 35 to convey concrete into the connecting mechanism 3 to fill the connecting mechanism 3, and finally perform a capping operation on the end groove of the concrete member 1.

[0041] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tensioning device for prestressed members in construction engineering, characterized in that, Comprising: Anchoring plate (41), which is composed of a square plate and a circular plate, and the circular plate is fixedly sleeved in the middle of the square plate, and a threaded hole is provided in the middle of the circular plate; Threaded plate (42), the anchoring plate (41) is threadedly sleeved with the threaded plate (42) through the threaded hole; Smooth plate (43), the anchoring plate (41) is movably sleeved with the smooth plate (43) through the threaded hole, and the smooth plate (43) is located behind the threaded plate (42); Steel strand (2), a main through hole is provided on the threaded plate (42), and an auxiliary through hole is provided on the smooth plate (43), and the steel strand (2) passes through the main through hole and the auxiliary through hole; Wedge-shaped clamp (5), the wedge-shaped clamp (5) includes a fixed block (51) and a fixed film (52), a fixed film (52) is fixedly connected between adjacent two fixed blocks (51), the front ends of the fixed blocks (51) and the front end of the fixed film (52) are both movably sleeved with the main through hole of the threaded plate (42), the rear ends of the fixed blocks (51) are attached to the side wall of the smooth plate (43), an auxiliary groove is provided on the smooth plate (43) outside the auxiliary through hole, and the rear end of the fixed film (52) is fixedly sleeved with the auxiliary groove of the smooth plate (43); Limiting member (7), the limiting member (7) includes a limiting rod (71) and a limiting block (72), connection holes are provided on both the threaded plate (42) and the smooth plate (43), and both ends of the limiting rod (71) are movably clamped with two symmetrically arranged connection holes respectively, there are upper and lower two limiting rods (71) in one limiting member (7), a limiting block (72) can be movably clamped between the upper and lower two limiting rods (71), and the limiting block (72) is located between the threaded plate (42) and the smooth plate (43) during tensioning, and the limiting block (72) is located behind the smooth plate (43) during relaxation; Using the limiting member (7) to control the distance between the threaded plate (42) and the smooth plate (43) at each time period, so that the wedge-shaped clamp (5) does not contact the steel strand (2) during tensioning, and the wedge-shaped clamp (5) is engaged with the steel strand (2) during relaxation.

2. The tensioning device for prestressed members in construction engineering according to claim 1, characterized in that, The main through hole is in the shape of a frustum of a cone with a narrow front and a wide rear, and the auxiliary through hole is in the shape of a cylinder, and the minimum aperture of both the main through hole and the auxiliary through hole is larger than the diameter of the steel strand (2).

3. The tensioning device for prestressed members in construction engineering according to claim 2, wherein, The number of the wedge-shaped clamps (5) is several, and several wedge-shaped clamps (5) are evenly arranged around the center of the threaded plate (42) or the smooth plate (43), the wedge-shaped clamps (5) are movably sleeved outside the steel strand (2), and the wedge-shaped clamp (5) further includes: The outer wall of the fixed block (51) is attached to the inner wall of the main through hole, the number of the fixed blocks (51) is four, and the four fixed blocks (51) are evenly arranged around the center of the main through hole or the auxiliary through hole.

4. The tensioning device for prestressed components in construction engineering according to claim 3, characterized in that, The number of the limiting members (7) is two, and the two limiting members (7) are located on the left and right sides of the threaded plate (42) or the smooth plate (43).

5. The tensioning device for prestressed members in construction engineering according to claim 4, characterized in that, The opposite faces of the threaded plate (42) and the smooth plate (43) have opposite magnetisms.

6. The tensioning device for prestressed components in construction engineering according to claim 5, characterized in that, The threaded plate (42), smooth plate (43), clamping pieces (5) and limit pieces (7) form a clamping assembly. Two clamping assemblies are linearly arranged in the anchor plate (41), and the two clamping assemblies form a set of clamping assemblies. The anchor plate (41) and a set of clamping assemblies form an anchorage mechanism (4), and there is an anchorage mechanism (4) at each end of the steel strand (2). On the clamping assembly at the rear end of the anchor plate (41), a threaded ring (44) is fixedly connected to the middle of the side of the smooth plate (43) away from the threaded plate (42).

7. The tensioning device for prestressed members in construction engineering according to claim 6, characterized in that, The clamping assembly further includes: A gas guiding member (6). Side holes are formed on the left and right sides of the circular plate outside the square plate of the anchor plate (41), and the gas guiding member (6) is fixedly embedded in the inside of the smooth plate (43).

8. The tensioning device for prestressed members in construction engineering according to claim 7, characterized in that, The gas guiding member (6) includes: A gas guiding ring (61). A gas guiding ring (61) is arranged behind each clamping piece (5), and the gas guiding ring (61) is circular; A gas guiding pipe (62). Adjacent gas guiding rings (61) are fixedly communicated through the gas guiding pipe (62); An air inlet pipe (63). The number of the air inlet pipes (63) is two, and one end of the air inlet pipe (63) is fixedly communicated with one of the gas guiding rings (61); An air outlet pipe (64). An air outlet pipe (64) is fixedly communicated with one side of the gas guiding ring (61), and the air outlet pipe (64) is communicated with the fixing film (52). A plurality of small air holes are formed on the inner side wall surface of the fixing film (52).

9. The tensioning device for prestressed members in construction engineering according to claim 8, characterized in that, It further includes: A concrete member (1). End grooves are formed at both ends of the concrete member (1), and the end grooves of the concrete member (1) are movably connected to the anchorage mechanism (4) through bolts; A connecting mechanism (3). The connecting mechanism (3) is movably arranged inside the concrete member (1).

10. The tensioning device for prestressed members in construction engineering according to claim 9, characterized in that, The connecting mechanism (3) includes: A corrugated pipe (31). The corrugated pipe (31) is movably sleeved inside the concrete member (1); A guiding pipe (32). Guiding pipes (32) are fixedly sleeved at both ends of the corrugated pipe (31), and the guiding pipes (32) are in contact with the anchor plate (41). The steel strand (2) movably passes through the corrugated pipe (31) and the guiding pipes (32); A spiral rib (33). A spiral rib (33) is fixedly sleeved outside the guiding pipe (32), and the spiral rib (33) is located on one side of the anchor plate (41); A communicating pipe (34). The top end of the corrugated pipe (31) is fixedly communicated with one end of the communicating pipe (34), and the other end of the communicating pipe (34) passes through the inside of the concrete member (1); A feeding member (35). The top end of one of the guiding pipes (32) is fixedly communicated with the feeding member (35), and the feeding member (35) passes through the anchor plate (41).

Images