Prestressed steel strand tensioning fine control device

Abstract

The invention discloses a prestressed steel strand tensioning fine control device which is characterized in that a steel strand is arranged in an engineering structure and extends out of the two ends of the engineering structure, and the prestressed steel strand tensioning fine control device comprises a supporting piece fixedly connected with the engineering structure, a tensioning piece, a plurality of prompting pieces and two first linkage mechanisms; through the arrangement of the supporting pieces and the tensioning pieces, the two ends of an engineering structure can be positioned through a screw rod and a positioning plate, a lead screw is driven to rotate through a driving motor, the lead screw drives a sliding plate to move through a supporting block, and the two tensioning pieces can move synchronously; according to the technical scheme, the steel strand corresponding to the tensioning part is always symmetrical along the central axis of the engineering structure, so that when the steel strand is tensioned, the situation that the prestress is uneven and the engineering structure is damaged due to the uneven prestress is avoided, the position of the steel strand which is being tensioned is prompted through the prompting part, and the safety of the engineering structure is improved. And the tensioned steel strands and the non-tensioned steel strands are distinguished through the marking pieces.

Description

Technical Field

[0001] The present invention relates to the technical field of construction, and particularly to a fine control device for prestressed steel strand tensioning. Background Art

[0002] Before the engineering structure components bear external loads, pre-tensile stress is applied to the steel strands in the tensioned module to improve the flexural capacity and stiffness of the components, delay the time of crack appearance, and increase the durability of the components. For mechanical structures, it means pre-generating stress in them, and the advantage is that it can improve the rigidity of the structure itself, reduce vibration and elastic deformation. This can significantly improve the elastic strength of the tensioned module and make the original resistance stronger.

[0003] Currently, when prestress tensioning is performed on the steel strands in an engineering structure, it is necessary to simultaneously tension the steel strands at both ends and on both sides of the engineering structure to prevent uneven prestress and damage to the engineering structure caused by uneven prestress. Usually, different tensioning point positions on the steel strands are also numbered. However, the numbering needs to be carried out in advance by construction workers, and the numbering method is prone to misalignment. Summary of the Invention

[0004] To overcome the defects existing in the prior art, the present invention provides a fine control device for prestressed steel strand tensioning, which solves the problem that during the prestress tensioning process of the steel strands in an engineering structure, in order to avoid uneven prestress and damage to the engineering structure caused by uneven prestress, when construction workers need to number the steel strands in advance, it is easy to produce misalignment.

[0005] To achieve the above object, the present invention provides a fine control device for prestressed steel strand tensioning. The steel strands are arranged in the engineering structure and extend out of both ends of the engineering structure. The fine control device for prestressed steel strand tensioning includes:

[0006] A support member fixedly connected to the engineering structure. The support member includes a support plate and two support blocks symmetrically arranged about the center of the support plate and movably installed on the first side of the support plate along the transverse direction. A driving mechanism for driving the two support blocks to move relative to each other is provided on the support plate, and a support frame is fixedly installed on the second side of the support plate;

[0007] A tensioning member includes two sliding plates respectively slidably installed along the longitudinal direction at the bottom of each support block and two jacks respectively fixedly connected to the bottom of each sliding plate. The two extended ends of the steel strands are respectively fixed to the two jacks, so that when the two jacks slide along the longitudinal direction away from the first side of the support plate with the two sliding plates, the steel strands are tensioned;

[0008] A plurality of prompting members are evenly installed on the support plate along the horizontal direction. Each prompting member includes a first telescopic spring telescopically arranged on the second side of the support plate, a pressure sensor for detecting the elastic force change generated by the telescopic movement of the first telescopic spring, and a prompting lamp for performing different displays according to different data detected by the pressure sensor. The end of the first telescopic spring on the side facing away from the support plate is connected to the support frame through the pressure sensor, and the prompting lamp is fixedly connected to the side of the support frame facing away from the pressure sensor;

[0009] Two first linkage mechanisms. The first ends of the two first linkage mechanisms are respectively connected to the two sliding plates. The second ends of the two first linkage mechanisms both extend longitudinally to the second side of the support plate. And when the second end of the first linkage mechanism moves horizontally to face a first telescopic spring along with the horizontal movement of the corresponding support block, it can contact the end of the first telescopic spring facing away from the pressure sensor, so as to convert the longitudinal movement of the sliding plate into the telescopic movement of the corresponding first telescopic spring.

[0010] Preferably, the driving mechanism includes a lead screw rotatably arranged through the support plate and two thread segments symmetrically arranged on the lead screw with opposite thread directions. The two support blocks are respectively sleeved and installed on the two thread segments. The end of the lead screw is coaxially connected with a driving motor for driving the lead screw to rotate, so as to drive the two support blocks to move relatively horizontally on the corresponding thread segments.

[0011] Preferably, a suspension rope is fixedly connected to the bottom of the sliding plate, and a suspension ring for fixing the jack is sleeved and connected to the side of the suspension rope facing away from the sliding plate.

[0012] Preferably, the first linkage mechanism includes a first limit post fixedly installed on the sliding plate, a second limit post arranged on the second side of the support plate and used for abutting against the first telescopic spring, two sliding posts symmetrically arranged on both sides of the first limit post and slidably installed on the support plate along the horizontal direction, two first connecting rods rotatably sleeved between the two sliding posts and the first limit post, and two second connecting rods rotatably sleeved between the two sliding posts and the second limit post.

[0013] Preferably, it further includes a plurality of identification members corresponding to the plurality of prompting members one by one. Each identification member includes a support rod telescopically arranged on the support frame along the vertical direction and a second linkage mechanism for converting the telescopic movement of the first telescopic spring along the longitudinal direction into the telescopic movement of the corresponding support rod along the vertical direction. An identification plate is fixedly installed at the first end of the support rod.

[0014] Preferably, a second telescopic spring is sleeved and installed on the support rod. Two ends of the second telescopic spring are respectively fixedly connected to the identification plate and the support frame. The second linkage mechanism includes a moving plate fixedly connected to an end of the first telescopic spring on a side opposite to the pressure sensor, a guiding groove formed in the moving plate and extending along the telescopic direction of the first telescopic spring, and a hollow groove formed in the moving plate on a side opposite to the first telescopic spring and extending along a direction perpendicular to the telescopic direction and communicating with the guiding groove. The side of the moving plate opposite to the first telescopic spring abuts against the second limiting post. The second end of the support rod sequentially penetrates through the support frame, the guiding groove and extends below the guiding groove, and a bottom plate is fixedly connected to the extending end. The bottom plate and the hollow groove are of a matching structure;

[0015] The moving plate moves along with the telescopic movement of the first telescopic spring. When moving, the support rod slides relative to the moving plate in the guiding groove until the bottom plate is located directly below the hollow groove. Under the reset action of the second telescopic spring, the bottom plate moves upward in the hollow groove, thereby driving the support rod and the identification plate to move upward.

[0016] Preferably, a fixing plate is fixedly connected to the support frame. A first baffle is fixedly connected between the fixing plate and the first telescopic spring. The moving plate penetrates through the fixing plate and is fixedly connected to the first baffle. A second baffle is fixedly connected to a side of the moving plate opposite to the fixing plate. The second baffle abuts against the second limiting post.

[0017] Preferably, screws are respectively rotatably connected to two ends of the support plate. The two screws respectively penetrate through the support plate, and positioning plates are fixedly connected to the penetrating ends. A placement space for placing the engineering structure is formed between the two positioning plates, and the two positioning plates are respectively fixedly connected to the engineering structure.

[0018] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0019] 1) By arranging the support member and the tension member, the screws and the positioning plates can position both ends of the engineering structure, so that the engineering structure is located at the central position inside the support plate. And by driving the motor to drive the lead screw to rotate, the lead screw drives the sliding plate to move through the support block, and the two tension members can be moved synchronously, so that the steel strands corresponding to the tension members are always symmetric about the central axis of the engineering structure. When the steel strands are tensioned, the situation of uneven prestress and damage to the engineering structure caused by uneven prestress will not occur.

[0020] 2) When the tensioning member is operated to stretch the steel strand, the slide plate will drive the first limit post to move. The first limit post drives the second link rod and the second limit post through the first link rod and the sliding post, so that the second limit post can move synchronously. The movement of the second limit post drives the second baffle plate, the moving plate and the first baffle plate to move. The movement of the first baffle plate squeezes the first telescopic spring, causing the first telescopic spring to generate elastic force. Then, the elastic force of the first telescopic spring is measured by the pressure sensor to confirm the positions of the first baffle plate and the slide plate, so that the pressure sensor controls the corresponding indicator light to emit light of a corresponding color, thereby prompting the outside personnel of the position where the steel strand is being tensioned, and preventing the outside personnel from being outside the tensioning position.

[0021] 3) When the moving plate moves, the moving plate drives the hollow groove to move above the bottom plate. At this time, the moving plate does not block the bottom plate, so that the bottom plate, the support rod and the identification plate move upward under the elastic force of the second telescopic spring. According to the different heights of the identification plate, the tensioned steel strands and the non-tensioned steel strands can be distinguished, so that when the steel strands are tensioned at intervals, the situation of repeated tensioning will not occur. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0023] Figure 1 It is the front view of the refined control device for prestressed steel strand tensioning in the embodiment of the present invention.

[0024] Figure 2 It is the structural schematic diagram of the support member in the embodiment of the present invention.

[0025] Figure 3 It is the structural schematic diagram of the tensioning member in the embodiment of the present invention.

[0026] Figure 4 It is the structural schematic diagram of the first linkage mechanism in the embodiment of the present invention.

[0027] Figure 5 It is the first structural schematic diagram of the prompting member in the embodiment of the present invention.

[0028] Figure 6 It is the second structural schematic diagram of the prompting member in the embodiment of the present invention.

[0029] Figure 7 It is the structural schematic diagram of the identification member in the embodiment of the present invention.

[0030] The corresponding relationships of the reference numerals in the drawings are as follows:

[0031] 11. Support plate; 12. Driving motor; 13. Lead screw; 14. Support block; 15. First chute; 16. Slide block; 17. Screw rod; 18. Positioning plate; 21. Second chute; 22. Slide plate; 23. Suspension rope; 24. Suspension ring; 25. Jack; 31. First limit post; 32. First connecting rod; 33. Slide post; 34. Second connecting rod; 35. Second limit post; 36. Third chute; 41. Support frame; 42. Fixed plate; 43. Pressure sensor; 44. First telescopic spring; 45. First baffle; 46. Moving plate; 47. Second baffle; 48. Warning light; 51. Guide groove; 52. Hollow groove; 53. Support rod; 54. Bottom plate; 55. Identification plate; 56. Second telescopic spring. Detailed implementation manners

[0032] The following further describes the detailed implementation manners of the present invention with reference to the drawings. It should be noted here that the description of these implementation manners is used to help understand the present invention, but does not constitute a limitation on the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Please refer to Figures 1 to 7 As shown, an embodiment of the present invention provides a fine control device for prestressed steel strand tensioning. The steel strand is arranged in the engineering structure and extends out of both ends of the engineering structure. The fine control device for prestressed steel strand tensioning includes a support member, a tensioning member, a plurality of prompting members, and two first linkage mechanisms.

[0034] Among them, the support member is fixedly connected to the engineering structure. The support member includes a support plate 11 and two support blocks 14 that are symmetrically arranged about the center of the support plate 11 and are movably installed on the first side of the support plate 11 along the transverse direction. A driving mechanism for driving the two support blocks 14 to move relative to each other is provided on the support plate 11. A support frame 41 is fixedly installed on the second side of the support plate 11;

[0035] The tensioning member includes two slide plates 22 that are respectively slidably installed at the bottom of each support block 14 along the longitudinal direction and two jacks 25 that are respectively fixedly connected to the bottom of each slide plate 22. The two extended ends of the steel strand are respectively fixed to the two jacks 25, so that the two jacks 25 tension the steel strand when sliding along the longitudinal direction away from the first side of the support plate 11 along with the two slide plates 22;

[0036] A plurality of prompting members are evenly installed on the support plate 11 in the horizontal direction. Each prompting member includes a first telescopic spring 44 telescopically arranged on the support plate 11, a pressure sensor 43 for detecting the change in elastic force generated by the first telescopic spring 44 due to telescopic movement, and a prompting lamp 48 for performing different displays according to different data detected by the pressure sensor 43. The end of the first telescopic spring 44 on the side facing away from the support plate 11 is connected to the support frame 41 through the pressure sensor 43, and the prompting lamp 48 is fixedly connected to the side of the support frame 41 facing away from the pressure sensor 43;

[0037] Two first linkage mechanisms. The first ends of the two first linkage mechanisms are respectively connected to two sliding plates 22. The second ends of the two first linkage mechanisms both extend longitudinally to the second side of the support plate 11. And when the second end of the first linkage mechanism moves horizontally to face a first telescopic spring 44 along with the horizontal movement of the corresponding support block 14, it can contact the end of the first telescopic spring 44 facing away from the pressure sensor 43, so as to realize the conversion of the longitudinal movement of the petal 22 into the telescopic movement of the facing first telescopic spring 44.

[0038] Please refer to Figures 1 to 3 As shown, the driving mechanism includes a lead screw 13 rotatably arranged through the support plate 11 and two thread segments symmetrically arranged on the lead screw 13 with opposite thread directions. Two support blocks 14 are respectively sleeved and installed on the two thread segments. The end of the lead screw 13 is coaxially connected with a driving motor 12 for driving the lead screw 13 to rotate, thereby driving the two support blocks 14 to move relatively on the corresponding thread segments. Preferably, in this embodiment, the two ends of the support plate 11 are respectively rotatably connected with screw rods 17. The two screw rods 17 respectively penetrate through the support plate 11 and the penetrating ends are fixedly connected with positioning plates 18. A placement space for placing the engineering structure is formed between the two positioning plates 18, and the two positioning plates 18 are respectively fixedly connected with the engineering structure. When in use, the support plate 11 is placed outside the engineering structure, and then by rotating the screw rods 17, the screw rods 17 drive the positioning plates 18 to move horizontally inward. When the positioning plates 18 move to the outside of the engineering structure and the moving distances of the two groups of screw rods 17 are the same, the engineering structure can be fixed at the central position inside the support plate 11. It should be noted that in this embodiment, the tensioning members are arranged in a staggered manner with the positioning plates 18 and the screw rods 17 to facilitate the fixing of the engineering structure to the support plate.

[0039] Further, in this embodiment, a suspension rope 23 is fixedly connected to the bottom of the skateboard 11, and a suspension ring 24 for fixing the jack 15 is sleeved and connected to the side of the suspension rope 23 facing away from the skateboard 11. It should be noted that when it is necessary to tension the steel strand in the engineering structure, by starting the driving motor 12, the driving motor 12 drives the lead screw 13 to rotate. The rotation of the lead screw 13 drives the support block 14 to move, so that the support block 14 moves in the first chute 15 in the direction of approaching or moving in the opposite direction under the drive of the slider 16, and the two jacks 25 can be respectively moved to the symmetric positions along the central axis of the engineering structure. Then, by moving the skateboard 22 outwards, the skateboard 22 moves outwards along the second chute 21. The movement of the skateboard 22 drives the jack 25 to move outwards through the suspension rope 23 and the suspension ring 24, and the steel strand can be tensioned by the jack 25. Since the two tensioning members move synchronously, the steel strands corresponding to the tensioning members are always symmetric along the central axis of the engineering structure, so that when the steel strands are tensioned, the situation of uneven prestress and damage to the engineering structure caused by uneven prestress will not occur.

[0040] Furthermore, in this embodiment, a first chute 15 is opened at the top end inside the support plate 11. The top of the support block 14 is fixedly connected with a slider 16. By the rotation of the lead screw 13, the support block 14 is driven to move, and then the slider 16 is driven to slide in the first chute 15.

[0041] Please refer to Figures 2 to 6 , in this embodiment, a second chute 21 for the skateboard 22 to slide is opened at the bottom of the slider 14. The first linkage structure includes a first limit post 31 fixedly installed on the skateboard 22, a second limit post 35 provided on the second side of the support plate 11 and used for abutting against the first telescopic spring 44, two sliding posts 33 symmetrically arranged on both sides of the first limit post 31 and slidably installed on the support plate 11 in a relatively movable manner in the horizontal direction, two first connecting rods 32 rotatably sleeved between the two sliding posts 33 and the first limit post 31, and two second connecting rods 34 rotatably sleeved between the two sliding posts 33 and the second limit post 35. Preferably, third chutes 36 for the two sliding posts 33 to slide are correspondingly opened on the support plate 11, and the first limit post 31 and the second limit post 35 are respectively located on both sides outside the third chutes 36. It should be noted that when the skateboard 22 drives the jack 25 to move outwards through the suspension rope 23 and the suspension ring 24, the movement of the skateboard 22 is linked by the first linkage mechanism, so that the second limit post 35 moves in the direction opposite to the skateboard 22, and then the first telescopic spring 44 is compressed to generate elastic force by the movement of the second limit post 35. When the movement reaches the set value (that is, the required tensioning distance of the steel strand), the pressure sensor 43 measures that the elastic force of the first telescopic spring 44 reaches the set value, and the pressure sensor 43 controls the indicator light 48 to emit a corresponding color light. Through the color of the light emitted by the indicator light 48, the position of the tensioned steel strand can be confirmed.

[0042] Furthermore, the refined control device for prestressed steel strand tensioning in this embodiment further includes a plurality of identification members corresponding to the plurality of prompt members one by one. Each identification member includes a support rod 53 vertically telescopically arranged on the support frame 41 and a second linkage mechanism for converting the longitudinal telescopic movement of the first telescopic spring 44 into the vertical telescopic movement of the corresponding support rod 53. A marking disc 55 is fixedly installed at the first end of the support rod 53. The marking disc 55 can change its height vertically as the support rod 53 moves vertically, so as to confirm the tensioning condition of the steel strand at the corresponding position through the height change.

[0043] Please refer to Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, in this embodiment, a second telescopic spring 56 is sleeved on the support rod 53. The two ends of the second telescopic spring 56 are respectively fixedly connected to the marking disc 55 and the support frame 41. The second linkage mechanism includes a moving plate 46 fixedly connected to the end of the first telescopic spring 44 on the side opposite to the pressure sensor 43, a guiding groove 51 opened on the moving plate 46 and extending along the telescopic direction of the first telescopic spring 44, and a hollow groove 52 arranged on the side of the moving plate 46 opposite to the first telescopic spring 44 and extending perpendicular to the telescopic direction and communicating with the guiding groove 51. The second end of the support rod 53 sequentially penetrates through the support frame 41 and the guiding groove 51 and extends below the guiding groove 51, and the extending end is fixedly connected with a bottom plate 54. The bottom plate 54 and the hollow groove 52 are of a matching structure. Preferably, when the moving plate 46 moves, the support rod 53 slides relative to the moving plate 46 in the guiding groove 51 until the bottom plate 54 is directly below the hollow groove 52, and under the reset action of the second telescopic spring 56, the bottom plate 54 moves upward in the hollow groove 52, thereby driving the support rod 53 and the marking disc 55 to move upward. It should be noted that the moving plate 46 moves along with the telescopic movement of the first telescopic spring 44. During the process, when the moving plate 46 drives the hollow groove 52 to move above the bottom plate 54, the moving plate 46 does not block the bottom plate 54, so that the bottom plate 54, the support rod 53 and the marking disc 55 move upward under the elastic force of the second telescopic spring 56. At this time, the bottom plate 54 moves to the upper end of the moving plate 46. Even after the moving plate 46 is reset under the elastic force of the second telescopic spring 56 (i.e., the action state of the second telescopic spring 56 is opposite to that of the first telescopic spring 44), the bottom plate 54 is still above the moving plate 46. At this time, this marking disc 55 is above other marking discs 55, indicating that the steel strand corresponding to this marking disc 55 has been tensioned.

[0044] Further, in this embodiment, a fixing plate 42 is fixedly connected to the support frame 41. A first baffle 45 is fixedly connected between the fixing plate 42 and the first telescopic spring 44. The moving plate 46 penetrates through the fixing plate 42 and is fixedly connected to the first baffle 45. A second baffle 47 is fixedly connected to the side of the moving plate 46 facing away from the fixing plate 42. The second baffle 47 abuts against the second limiting post 35. It should be noted that when operating the tensioning member to stretch the steel strand, the sliding plate 22 will drive the first limiting post 31 to move. The first limiting post 31 drives the second connecting rod 34 and the second limiting post 35 through the first connecting rod 32 and the sliding column 33, so that the second limiting post 35 can move synchronously. The reverse movement of the second limiting post 35 drives the second baffle 47, the moving plate 46 and the first baffle 45 to move. The movement of the first baffle 45 squeezes the first telescopic spring 44, causing the first telescopic spring 44 to generate an elastic force. Then, the elastic force of the first telescopic spring 44 is measured by the pressure sensor 43 to confirm the positions of the first baffle 45 and the sliding plate 22 (i.e., the tensioning position). It should be noted that in this embodiment, the elastic coefficient of the first telescopic spring 44 and the sliding distance of the sliding plate 22 are both preset according to the tensioning requirements of the steel strand. That is to say, a specific sliding distance, elastic coefficient, and the telescopic position of the support rod 53 just meet the tensioning requirements of the corresponding points on the steel strand.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations of these embodiments still fall within the protection scope of the present invention.

Claims

1. A prestressed steel strand tensioning fine control device, the steel strand is arranged in an engineering structure and extends out of both ends of the engineering structure, characterized in that: The prestressed steel strand tensioning refined control device comprises: A support member fixedly connected to the engineering structure, the support member comprising a support plate and two support blocks symmetrically arranged about the center of the support plate and relatively movably installed on a first side of the support plate in a lateral direction, the support plate being provided with a driving mechanism for driving the two support blocks to move relative to each other, and a support frame fixedly installed on a second side of the support plate; The tensioning member comprises two slide plates respectively mounted on the bottom of each support block slidably in the longitudinal direction and two jacks respectively fixedly connected to the bottom of each slide plate, and the two extending ends of the steel strand are respectively fixed to the two jacks, so that the two jacks tension the steel strand when the two slide plates slide in the longitudinal direction away from the first side of the support plate; A plurality of prompting members are uniformly installed on the support plate in the transverse direction, each of the prompting members comprises a first telescopic spring telescopically arranged on the second side of the support plate, a pressure sensor for detecting a change in elastic force caused by a telescopic movement of the first telescopic spring, and a prompting light for performing different displays according to different data detected by the pressure sensor, an end of the first telescopic spring on a side facing away from the support plate is connected to the support frame through the pressure sensor, and the prompting light is fixedly connected to a side of the support frame facing away from the pressure sensor; Two first linkage mechanisms, the first ends of the two first linkage mechanisms are respectively connected to the two slides, the second ends of the two first linkage mechanisms both extend longitudinally to the second side of the support plate, and the second ends of the first linkage mechanisms can contact the end of the first telescopic spring facing away from the pressure sensor when they move laterally to face the first telescopic spring along with the lateral movement of the corresponding support block, so as to realize the conversion of the longitudinal movement of the slide into the telescopic movement of the first telescopic spring facing it.

2. The device for controlling the tensioning of prestressed steel strands according to claim 1, characterized in that: The driving mechanism includes a screw rod rotatably arranged through the support plate and two threaded segments symmetrically arranged on the screw rod and with opposite thread directions. The two support blocks are respectively mounted on the two threaded segments. The ends of the screw rod are coaxially connected to a driving motor for driving the screw rod to rotate, thereby driving the two support blocks to move relative to each other laterally on the corresponding threaded segments.

3. The device for controlling the tensioning of prestressed steel strands according to claim 1, characterized in that: The bottom of the slide plate is fixedly connected with a lifting rope, and a lifting ring for fixing the jack is sleeved and connected on a side of the lifting rope facing away from the slide plate.

4. The device for controlling the tensioning of prestressed steel strands according to claim 1, characterized in that: The first linkage mechanism includes a first limiting column fixedly mounted on the slide plate, a second limiting column arranged on the second side of the support plate and used to abut against the first telescopic spring, two sliding columns symmetrically arranged on both sides of the first limiting column and mounted on the support plate so as to be relatively movable in the transverse direction, two first connecting rods rotatably sleeved and connected between the two sliding columns and the first limiting column, and two second connecting rods rotatably sleeved and connected between the two sliding columns and the second limiting column.

5. The device for controlling the tensioning of prestressed steel strands according to claim 4, characterized in that: It also includes a plurality of identification members arranged one by one corresponding to the plurality of prompt members, each of the identification members includes a support rod which is vertically telescopically arranged on the support frame and a second linkage mechanism for converting the longitudinal telescopic movement of the first telescopic spring into the vertical telescopic movement of the corresponding support rod, and an identification plate is fixedly mounted on the first end of the support rod.

6. The device for controlling the tensioning of prestressed steel strands according to claim 5, characterized in that: The second end of the support rod is provided with a second telescopic spring, and two ends of the second telescopic spring are respectively fixedly connected to the identification plate and the support frame, and the second linkage mechanism comprises a movable plate fixedly connected to the end portion of the first telescopic spring on the side facing away from the pressure sensor, a guide groove provided on the movable plate and extending along the telescopic direction of the first telescopic spring, and a hollow groove extending perpendicular to the telescopic direction and provided on the side of the movable plate facing away from the first telescopic spring and connected to the guide groove, the side of the movable plate facing away from the first telescopic spring abuts against the second limiting column, the second end of the support rod sequentially penetrates the support frame and the guide groove and extends to the bottom of the guide groove, and the extending end is fixedly connected to a bottom plate, and the bottom plate and the hollow groove are an adaptive structure; The movable plate moves with the telescopic movement of the first telescopic spring, and during the movement, the support rod slides relative to the movable plate in the guide groove until the bottom plate is located directly below the hollow groove. Under the resetting action of the second telescopic spring, the bottom plate moves upward in the hollow groove, thereby driving the support rod and the identification plate to move upward.

7. The device for controlling the tensioning of prestressed steel strands according to claim 6, characterized in that: A fixed plate is fixedly connected to the support frame, a first baffle is fixedly connected between the fixed plate and the first telescopic spring, the movable plate passes through the fixed plate and is fixedly connected to the first baffle, a second baffle is fixedly connected to the side of the movable plate facing away from the fixed plate, and the second baffle is abutted against the second limiting column.

8. The device for controlling the tensioning of prestressed steel strands according to claim 1, characterized in that: The two ends of the support plate are rotatably connected with screw rods, and the two screw rods penetrate the support plate respectively and the penetration ends are fixedly connected with positioning plates. A placement space for placing the engineering structure is formed between the two positioning plates, and the two positioning plates are fixedly connected to the engineering structure respectively.

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