Positioning device for prestressed steel strand in prestressed beam and construction method thereof

Abstract

The application discloses a positioning device for prestressed steel strands in prestressed beams and a construction method thereof. The positioning device comprises vertical pull rods, a plurality of horizontal adjusting rods and fixing tendon seats arranged on the horizontal adjusting rods. The vertical pull rods are arranged in the vertical direction in the prestressed beams, and fixing steel plates are arranged at the two ends of the vertical pull rods and fixed in the prestressed concrete beams by binding. The horizontal adjusting rods are horizontally arranged on the vertical pull rods along the distribution direction of the prestressed steel strands, movably connected with the vertical pull rods and provided with positioning adjusting grooves. The fixing tendon seats are movably arranged in the positioning adjusting grooves and used in cooperation with the prestressed steel strands. The positioning device has the characteristics of simple structure, flexible use, convenience and high positioning efficiency, and can flexibly position the prestressed steel strands in the prestressed beams according to the needs in use.

Description

Technical Field

[0001] The present invention relates to the technical field of prestressed bridge construction equipment, and in particular to a positioning device for prestressed steel strands in a prestressed beam and a construction method thereof. Background Art

[0002] A box girder is a modular unit of a bridge deck and a type of beam in bridge engineering. The cross-section of a box girder is approximately trapezoidal, with a hollow interior and a length ranging from a dozen to several dozen meters. In order to ensure the strength of the box girder, steel strands are generally added to the box girder to tighten the box girder along its length. In the existing construction process, the steps for tightening the steel strands are as follows: first, the steel strands at the ends of the box girder are fixed by anchors, and then the ends of the steel strands are tightened by jacks. Then, the anchors are fixedly connected to the steel strands by fixing blocks or clamps. After the anchors and the steel strands are fixedly connected, the jacks are removed and the steel strands are cut along the outer end face of the anchors.

[0003] However, during the use of this process, the two ends of the prestressed steel strand in the beam are mainly positioned by the anchoring effect of the anchor. As for the positioning of the steel strand in the beam, there is no special positioning structure designed for the prestressed steel strand in the prestressed beam. Therefore, during the construction of the prestressed steel strand, the following problems still exist and cannot be effectively solved:

[0004] 1. Since the steel strand itself is a flexible structure, when prestressing is applied to the steel strand, the position of the steel strand will change under the action of prestressing, resulting in the inability to accurately position the steel strand, affecting the overall stability and strength of the prestressed beam after construction;

[0005] 2. During the construction of the steel strand, there is no special adjustable structure to fine-tune its position. As a result, once the position is found to be offset during use, it is necessary to rework and readjust from both ends, which leads to a long rework cycle and affects the construction period;

[0006] Therefore, it is urgent to design a new positioning device for prestressed steel strands in prestressed beams to position the prestressed steel strands in the prestressed beams. Summary of the Invention

[0007] In response to the above-mentioned problems, the present invention aims to provide a positioning device for prestressed steel strands in prestressed beams and a construction method thereof. This positioning device, through the arrangement of vertical pull rods, transverse adjustment rods and fixed rib seats, can flexibly position the prestressed steel strands in prestressed beams according to needs during use. It has the characteristics of simple structure, flexible and convenient use and high positioning efficiency.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A positioning device for prestressed steel strands in a prestressed beam comprises a vertical pull rod, a plurality of transverse adjustment rods and fixed rib seats arranged on the transverse adjustment rods.

[0010] The vertical tie rod is arranged in the vertical direction in the prestressed beam, and fixed steel plates are provided at both ends of the vertical tie rod, and the fixed steel plates are tied and fixed in the prestressed concrete beam;

[0011] The transverse adjustment rod is horizontally arranged on the vertical pull rod along the distribution direction of the prestressed steel strands, is movably connected to the vertical pull rod, and is provided with a positioning adjustment slot;

[0012] The fixed rib seat is movably arranged in the positioning adjustment groove and is used in conjunction with the prestressed steel strand.

[0013] Preferably, the vertical pull rod includes a vertical main rod and a vertical auxiliary rod used in conjunction with each other, the vertical main rod and the vertical auxiliary rod are both vertically arranged in the prestressed concrete beam, and a number of oblong holes and positioning adjustment holes are provided on the vertical main rod and the vertical auxiliary rod.

[0014] Preferably, a sleeve is provided on the fixed steel plate, and an internal thread is provided in the sleeve for use with the external threads provided on the outer ends of the vertical main rod and the vertical auxiliary rod; and a circular hole is also provided on the fixed steel plate, and the circular hole is tied and connected with the longitudinal reinforcement in the prestressed concrete beam.

[0015] Preferably, the lateral adjustment rod comprises a main rod and two auxiliary rods used in conjunction with each other.

[0016] The main rod is arranged between two symmetrically arranged auxiliary rods, and a through hole and a positioning mechanism are provided on the main rod. The through hole is arranged in the middle of the main rod and is used in conjunction with the vertical pull rod. The positioning mechanism is symmetrically arranged on both sides of the through hole and is used in conjunction with the positioning adjustment hole.

[0017] The auxiliary rods are symmetrically arranged at both ends of the main rod, and positioning adjustment grooves and oblong holes are penetrated on the main rod and the auxiliary rods. The positioning adjustment grooves are strip-shaped and are used in conjunction with the fixed rib seat.

[0018] Preferably, the positioning mechanism includes an inner sleeve, a positioning member and an adjusting member.

[0019] The inner sleeve is threadedly arranged in the main rod, and a first adjustment groove is provided on the inner sleeve and communicates with the internal cavity of the inner sleeve;

[0020] The positioning member is movably arranged in the inner cavity of the main rod through the third spring, and an insert block is provided at the front end of the positioning member for use in conjunction with the positioning adjustment hole;

[0021] The adjusting member is detachably connected to the positioning member and is used in conjunction with a second adjusting slot provided on the side wall of the main rod.

[0022] Preferably, the upper connecting portion of the positioning member is not higher than the side wall of the inner sleeve, and a screw hole is provided on the upper connecting portion of the positioning member to connect with the adjusting member.

[0023] Preferably, the fixed rib seat includes an arc-shaped fixing member, a positioning rod and a limiting member.

[0024] The arc-shaped fixing piece is symmetrically arranged on the upper end of the positioning rod through a pin rod, and a fixed rib groove is formed between the two fixing pieces to cooperate with the prestressed steel strand;

[0025] The positioning rod is a screw rod, which is installed in the positioning adjustment groove through a positioning nut;

[0026] The limiting component is movably mounted on the fixing component and is used in conjunction with the fixing component.

[0027] Preferably, a positioning member fixing seat is also provided on the top of the positioning rod for use in conjunction with the pin rod, and the fixing member is rotatably installed on the positioning rod through the first torsion spring and the second torsion spring respectively; and a first limit card is also provided on the lower side of the upper port of the fixing member, and the first limit card is used in conjunction with the second limit card provided at both ends of the limiting member.

[0028] Preferably, the first position-limiting card platform is further provided with a plurality of card slots, which are used in conjunction with the card blocks provided on the second position-limiting card platform; the position-limiting member further comprises a position-limiting belt, which is made of a flexible material.

[0029] A construction method for a positioning device for prestressed steel strands in a prestressed beam comprises the following steps:

[0030] S1: After the prestressed beam reinforcement is tied, the fixing steel plates are placed in the corresponding positions according to the prestressed steel strand elevation layout in the prestressed steel detail drawing and the positions required by the prestressed steel detail drawing;

[0031] S2: Adjust the length of the vertical tie rod according to the height position of the prestressed steel strand, and set the position and number of the transverse adjustment rods according to the prestressed steel strand layout diagram;

[0032] S3: Determine the number of fixed ribs according to the number of prestressed steel strands, and use the fixed ribs 6 to fix the prestressed steel strands.

[0033] The beneficial effects of the present invention are as follows: the present invention discloses a positioning device for prestressed steel strands in a prestressed beam and a construction method thereof. Compared with the prior art, the present invention has the following improvements:

[0034] The present invention designs a positioning device for prestressed steel strands in a prestressed beam, comprising a vertical pull rod arranged in a vertical direction and a transverse adjustment rod arranged in a horizontal direction. When in use:

[0035] 1. Under the limit of the nut, the position of the fixed rib seat is guaranteed not to change arbitrarily, thereby ensuring that the position of the prestressed steel strand on the fixed rib seat positioning device will not change, and more accurate positioning can be achieved;

[0036] 2. The installation position of the prestressed steel strand can be adjusted by sliding the fixed reinforcement seat, which can avoid the situation where the prestressed steel strand position is inaccurate and can only be adjusted by rework, and avoid the sparks from welding during the rework process from damaging the important plastic protective cover;

[0037] 3. Both the vertical tension rod and the transverse adjustment rod are telescopically adjustable in length, allowing for precise spatial positioning of the prestressed steel strands according to the actual project location. The fixed ribs installed on the transverse adjustment rods can slide on the rods to accurately position the prestressed steel strands, and the number of fixed ribs can be determined according to project requirements, providing flexible operation and minimizing material waste.

[0038] 4. It can effectively protect the outer sleeve of the prestressed steel strand, prevent the outer sleeve from being damaged during the construction process, extend its service life, and improve economic benefits. The device is simple to process, easy to operate, easy to install, and has good flexibility. It has the advantages of simple structure, flexible and convenient use, and high positioning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is an overall schematic diagram of the prestressed steel strand positioning device in a concrete beam of the present invention.

[0040] Figure 2 It is a structural schematic diagram of the vertical pull rod of the present invention.

[0041] Figure 3 It is a cross-sectional view of the vertical pull rod A of the present invention.

[0042] Figure 4 It is a structural schematic diagram of the fixed steel plate of the present invention.

[0043] Figure 5 It is a structural schematic diagram of the lateral adjustment rod of the present invention.

[0044] Figure 6 It is a cross-sectional view of the transverse adjustment rod B of the present invention.

[0045] Figure 7 It is a structural schematic diagram of the positioning member of the present invention.

[0046] Figure 8It is a top view of the local structure of the transverse adjustment rod of the present invention.

[0047] Figure 9 It is a structural schematic diagram of the fixed rib seat of the present invention.

[0048] Figure 10 Schematic diagram of the structure of the fixing member of the present invention.

[0049] Figure 11 Schematic diagram of the structure of the limiting member of the present invention.

[0050] Figure 12 Schematic diagram of the structure of the positioning rod of the present invention.

[0051] Figure 13 It is a cross-sectional view of the fixed rib seat C of the present invention.

[0052] Among them: 1-vertical pull rod, 11-vertical main rod, 12-vertical auxiliary rod, 13-positioning adjustment hole; 2-lateral adjustment rod, 21-lateral main rod, 211-through hole, 212-second adjustment slot, 22-lateral auxiliary rod, 23-inner kit, 231-first adjustment slot, 24-positioning piece, 241-insert block, 25-third spring, 26-adjustment piece; 3-fixed steel plate, 31-sleeve; 4-round hole, 5-long round hole, 6-fixed rib seat, 61-fixing piece, 611-first limiting clamping platform, 612-slot, 62-positioning rod, 621-positioning piece fixing seat, 63-positioning nut, 64-pin rod, 65-limiting piece, 651-limiting belt, 652-block, 66-first torsion spring, 67-second torsion spring, 7-positioning adjustment slot. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0054] Example 1: Refer to the attached Figure 1-13 The positioning device of the prestressed steel strand in the prestressed beam shown in the figure comprises a vertical tie rod 1, a plurality of transverse adjustment rods 2 and a fixed rib seat 6 movably arranged on the transverse adjustment rod 2, wherein

[0055] The vertical tie rod 1 is arranged in the vertical direction in the prestressed beam, and fixed steel plates 3 are provided at both ends of the vertical tie rod 1. The fixed steel plates 3 are tied and fixed in the prestressed concrete beam to fix the position of the vertical tie rod 1;

[0056] The transverse adjustment rod 2 is horizontally arranged on the vertical pull rod 1 along the distribution direction of the prestressed steel strands, and is movably connected to the vertical pull rod 1. A positioning adjustment slot 7 is provided on the transverse adjustment rod 2.

[0057] The fixed rib seat 6 is movably arranged in the positioning adjustment groove 7 and is used in conjunction with the prestressed steel strand.

[0058] Preferably, in order to facilitate the adjustment of the length of the vertical pull rod 1 as needed during use, the vertical pull rod 1 is designed to include a vertical main rod 11 and a vertical auxiliary rod 12 that cooperate with each other, both of which are arranged vertically in the prestressed concrete beam, and oblong holes 5 in the length direction are provided on the vertical main rod 11 and the vertical auxiliary rod 12. When in use, the length of the rod can be adjusted according to the height position of the prestressed steel strand, and external threads are provided on the outer ends of the vertical main rod 11 and the vertical auxiliary rod 12 for use in conjunction with the fixed steel plate 3.

[0059] Preferably, in order to facilitate the detachable installation of the fixed steel plate 3 on both ends of the vertical pull rod 1, a sleeve 31 is welded on the fixed steel plate 3, and an internal thread is provided in the sleeve 31 for use with the external thread provided on the outer ends of the vertical main rod 11 and the vertical auxiliary rod 12. When in use, the fixed steel plate 3 is detachably installed on both ends of the vertical pull rod 1 through the installation effect according to the above logic; at the same time, in order to fix the fixed steel plate 3 in the prestressed beam, a circular hole 4 is also provided on the fixed steel plate 3, and the circular hole 4 is convenient for tying and fixing this positioning device with the longitudinal reinforcement in the prestressed concrete beam. The advantage of using a tying method over a welding fixing device is that stress concentration of the longitudinal reinforcement inside the prestressed concrete beam can be avoided.

[0060] Preferably, in order to facilitate the adjustment of the length of the transverse adjustment rod 2 according to the construction needs in the prestressed beam during use, the transverse adjustment rod 2 is designed to include a main rod 21 and two auxiliary rods 22 that cooperate with each other, wherein

[0061] The main rod 21 is arranged between two symmetrically arranged auxiliary rods 22, and a through hole 211 and a positioning mechanism are provided on the main rod 21. The through hole 211 is provided in the middle of the main rod 21 and is used in conjunction with the vertical pull rod 1. The positioning mechanism is symmetrically provided on both sides of the through hole 211 and is used in conjunction with the positioning adjustment hole 13 provided on the vertical pull rod 1 to position the lateral adjustment rod 2 on the vertical pull rod 1 when in use.

[0062] The auxiliary rods 22 are symmetrically arranged at both ends of the main rod 21, and positioning adjustment grooves 7 and oblong holes 5 are provided through the main rod 21 and the auxiliary rods 22 for arranging fixed ribs 6 for fixing the prestressed steel strands.

[0063] Preferably, for ease of use and adjustment, the positioning adjustment groove 7 is designed to be in the shape of a strip, so that the spacing of the fixed rib seats 6 for fixing the prestressed steel strands can be adjusted by sliding according to specific engineering requirements. The fixed rib seats 6 can be slidably positioned along the positioning adjustment grooves 7 in the transverse adjustment rod and the number is not unique, and can be set according to actual engineering requirements.

[0064] The construction method of the prestressed steel strand positioning device in the concrete prestressed beam described in this embodiment includes the following steps:

[0065] S1: After the prestressed beam reinforcement is tied, the fixing steel plate 3 is placed at the corresponding position according to the prestressed steel strand elevation layout in the prestressed steel strand detailed drawing and the position required by the prestressed steel strand detailed drawing;

[0066] S2: Adjust the length of the vertical tie rod 1 according to the height position of the prestressed steel strand, and set the position and number of the transverse adjustment rods 2 according to the prestressed steel strand layout diagram;

[0067] S3: Determine the number of fixed ribs 6 according to the number of prestressed steel strands, and use the fixed ribs 6 to fix the prestressed steel strands.

[0068] Embodiment 2: Different from the above embodiment 1, in order to be able to position the lateral adjustment rod 2 on the vertical pull rod 1 during use, the positioning mechanism is designed to include an inner set 23, a positioning member 24 and an adjusting member 26, wherein

[0069] The inner sleeve 23 is screwed and installed in the main rod 21, and a first adjustment groove 231 is provided on the inner sleeve 23 and communicates with the internal cavity of the inner sleeve 23;

[0070] The positioning member 24 is movably mounted in the inner cavity of the main rod 21 via a third spring 25 , and an insert 241 is provided at the front end of the positioning member 24 for use in conjunction with the positioning adjustment hole 13 ;

[0071] The adjusting member 26 is detachably connected to the positioning member 24 and is used in conjunction with the second adjusting slot 212 provided on the side wall of the main rod 21 .

[0072] Preferably, in order to facilitate installation, the positioning mechanism can be screwed into the main rod 21, and the upper end connection part of the positioning member 24 is designed not to be higher than the side wall of the inner sleeve 23, and a screw hole is provided on the upper end connection part of the positioning member 24 to be screwed into the adjustment member 26.

[0073] The use process and principle of the positioning mechanism described in this embodiment include:

[0074] S2.1: After adjusting the length of the vertical tie rod 1 according to the height of the prestressed steel strands and setting the position and number of the transverse adjustment rods 2 according to the prestressed steel strand layout diagram, pull the adjustment member 26 backward, causing the positioning member 24 to compress the third spring 25, allowing the transverse adjustment rod 2 to move along the length of the vertical tie rod 1.

[0075] S2.2: After adjusting the lateral adjustment rod 2 to the required height of the vertical pull rod 1, loosen the adjustment member 26, so that the positioning member 24 is reset under the action of the third spring 25, and the insert block 241 is inserted into the positioning adjustment hole 13, completing the positioning of the lateral adjustment rod 2 at a fixed height on the vertical pull rod 1.

[0076] Embodiment 3: Different from the above embodiment, in order to facilitate the installation of the fixed rib seat 6 during use and to fix the prestressed steel strand by using the fixed rib seat 6, the fixed rib seat 6 is designed to include an arc-shaped fixing member 61, a positioning rod 62 and a limit member 65, wherein

[0077] The arc-shaped fixing members 61 are symmetrically mounted on the upper end of the positioning rod 62 through a pin rod 64, and a fixed rib groove is formed between the two arc-shaped fixing members 61 for use with the prestressed steel strand;

[0078] The positioning rod 62 is a screw member, which is installed in the positioning adjustment groove 7 through the positioning nut 63;

[0079] The limiting member 65 is movably mounted on the fixing member 61 and is used in conjunction with the fixing member 61 to position the prestressed steel strand installed in the fixing rib groove.

[0080] Preferably, in order to facilitate the detachable installation of the two fixing members 61 on the positioning rod 62 and to facilitate the reset of the fixing members 61 during use, a positioning member fixing seat 621 is also provided on the top of the positioning rod 62 for use in conjunction with the pin rod 64, and the fixing members 61 are respectively installed on the positioning rod 62 through the first torsion spring 66 and the second torsion spring 67, so that the two fixing members 61 can automatically reset after the prestressed steel strand is stuck in the fixed rib groove, thereby fixing the prestressed steel strand.

[0081] Preferably, in order to facilitate the insertion of prestressed steel strands having a diameter larger than the upper opening of the fixed rib groove into the fixed rib groove during use, the upper end of the fixing piece 61 is provided with a flared structure, which facilitates the insertion of prestressed steel strands having a diameter larger than the upper opening of the fixed rib groove into the fixed rib groove.

[0082] Preferably, in order to limit the prestressed steel strand during use and prevent it from sliding out after being clamped, a first limiting clamp 611 is further provided on the lower side of the upper port portion of the fixing member 61. The first limiting clamp 611 is used in conjunction with the second limiting clamp 652 provided at both ends of the limiting member 65. That is, during use, after the prestressed steel strand is clamped into the fixed rib groove, the limiting member 65 is installed horizontally so that after the first limiting clamp 611 and the second limiting clamp 652 are clamped to each other, the upper end opening of the fixed rib groove can be closed to prevent it from sliding out of the fixed rib groove during the process of applying prestress to the steel strand.

[0083] Preferably, in order to ensure the engagement effect between the first limit clamping platform 611 and the second limit clamping platform 652, so that the fixing member 61 and the limit member 65 can be linked, a plurality of clamping slots 612 are also provided on the first limit clamping platform 611. The clamping slots 612 are used in conjunction with the clamping blocks 652 provided on the second limit clamping platform 652, that is, after installation, the clamping blocks 652 are clamped into the clamping slots 612 to form a constraint mechanism to limit the prestressed steel strands.

[0084] Preferably, the limiting member 65 further includes a limiting belt 651 , which is made of a flexible material and is squeezed on the upper end of the prestressed steel strand when in use.

[0085] The construction process and construction principle of the fixed rib seat 6 in this embodiment include:

[0086] S3.1: After the transverse adjustment rod 2 is fixed, first use the pin 64 to install the fixing member 61 on the upper end of the positioning rod 62. Then, use the positioning nut 63 to install the positioning rod 62 in the positioning adjustment slot 7. Then, adjust the position of the fixing rib seat 6 in the positioning adjustment slot 7 according to the positioning position of the prestressed steel strand. After the adjustment is completed, use the positioning nut 63 to fix the positioning rod 62.

[0087] S3.2: Then clamp the prestressed steel strand into the fixed reinforcement groove, and install the limit piece 65 horizontally, so that the first limit clamping platform 611 and the second limit clamping platform 652, and the clamping block 652 are clamped into the clamping groove 612, forming a constraint mechanism to limit the prestressed steel strand.

[0088] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning device for prestressed steel strands in a prestressed beam, characterized by: It includes a vertical pull rod, several horizontal adjustment rods and fixed ribs arranged on the horizontal adjustment rods. The vertical tie rod is arranged in the vertical direction in the prestressed beam, and fixed steel plates are provided at both ends of the vertical tie rod, and the fixed steel plates are tied and fixed in the prestressed concrete beam; The transverse adjustment rod is horizontally arranged on the vertical pull rod along the distribution direction of the prestressed steel strands, is movably connected to the vertical pull rod, and is provided with a positioning adjustment slot; The fixed rib seat is movably arranged in the positioning adjustment groove and is used in conjunction with the prestressed steel strand; The lateral adjustment rod includes a main rod and two auxiliary rods used in conjunction with each other. The main rod is arranged between two symmetrically arranged auxiliary rods, and a through hole and a positioning mechanism are provided on the main rod. The through hole is provided in the middle of the main rod and is used in conjunction with the vertical pull rod. The positioning mechanism is symmetrically provided on both sides of the through hole and is used in conjunction with the positioning adjustment hole provided on the vertical pull rod. The auxiliary rods are symmetrically arranged at both ends of the main rod, and positioning adjustment grooves and oblong holes are provided on both the main rod and the auxiliary rods. The positioning adjustment grooves are in the shape of strips and are used in conjunction with the fixed rib seats. The positioning mechanism includes an inner sleeve, a positioning member and an adjusting member. The inner sleeve is threadedly arranged in the main rod, and a first adjustment groove is provided on the inner sleeve and communicates with the internal cavity of the inner sleeve; The positioning member is movably arranged in the inner cavity of the main rod through the third spring, and an insert block is provided at the front end of the positioning member for use in conjunction with the positioning adjustment hole; The adjusting member is detachably connected to the positioning member and is used in conjunction with the second adjusting slot provided on the side wall of the main rod; The upper connecting portion of the positioning member is no higher than the side wall of the inner sleeve, and a screw hole is provided on the upper connecting portion of the positioning member to connect with the adjusting member; The fixed rib seat includes an arc-shaped fixing piece, a positioning rod and a limiting piece. The arc-shaped fixing piece is symmetrically arranged on the upper end of the positioning rod through a pin rod, and a fixed rib groove is formed between the two arc-shaped fixing pieces for use in conjunction with the prestressed steel strand; The positioning rod is a screw rod, which is installed in the positioning adjustment groove through a positioning nut; The limiting piece is movably mounted on the arc-shaped fixing piece and is used in conjunction with the arc-shaped fixing piece.

2. The positioning device for prestressed steel strands in a prestressed beam according to claim 1, characterized in that: The vertical pull rod includes a vertical main rod and a vertical auxiliary rod used in conjunction with each other. The vertical main rod and the vertical auxiliary rod are both arranged vertically in the prestressed concrete beam, and are each provided with a plurality of oblong holes and positioning adjustment holes in the length direction.

3. The positioning device for prestressed steel strands in a prestressed beam according to claim 2, characterized in that: The fixed steel plate is provided with a sleeve, and the sleeve is provided with an internal thread for use with the external thread provided on the outer ends of the vertical main rod and the vertical auxiliary rod; and the fixed steel plate is also provided with a circular hole, which is tied and connected with the longitudinal reinforcement in the prestressed concrete beam.

4. The positioning device for prestressed steel strands in a prestressed beam according to claim 3, characterized in that: A positioning member fixing seat is also provided on the top of the positioning rod for use in conjunction with the pin rod, and the arc-shaped fixing member is rotatably installed on the positioning rod through the first torsion spring and the second torsion spring respectively; and a first limit clamping platform is also provided on the lower side of the upper port of the arc-shaped fixing member, and the first limit clamping platform is used in conjunction with the second limit clamping platform provided at both ends of the limit member.

5. The positioning device for prestressed steel strands in a prestressed beam according to claim 4, characterized in that: The first position-limiting card platform is further provided with a plurality of card slots, which are used in conjunction with the card blocks provided on the second position-limiting card platform; the position-limiting member further comprises a position-limiting belt, which is made of a flexible material.

6. A construction method for a positioning device for prestressed steel strands in a prestressed beam according to any one of claims 1 to 5, characterized in that: Including steps: S1: After the prestressed beam reinforcement is tied, the fixing steel plates are placed in the corresponding positions according to the prestressed steel strand elevation layout in the prestressed steel detail drawing and the positions required by the prestressed steel detail drawing; S2: Adjust the length of the vertical tie rod according to the height position of the prestressed steel strand, and set the position and number of the transverse adjustment rods according to the prestressed steel strand layout diagram; S3: Determine the number of fixed reinforcement seats according to the number of prestressed steel strands, and use the fixed reinforcement seats to fix the prestressed steel strands.

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