Cast-in-place box girder prestress tensioning device and method

Abstract

The invention relates to the technical field of prestress tensioning equipment, in particular to a cast-in-place box girder prestress tensioning device and method.The cast-in-place box girder prestress tensioning device comprises a U-shaped bottom frame, supporting legs, supporting frames and supporting cross beams, the multiple sets of supporting legs are arranged at the bottom end of the U-shaped bottom frame, the two sets of supporting frames are arranged at the top end of the U-shaped bottom frame, and the two sets of supporting cross beams are installed at the top ends of the two sets of supporting frames; the device further comprises a moving assembly, a hoisting assembly, a tensioning assembly and a baffle assembly, the moving assembly is installed on the two sets of supporting cross beams, the hoisting assembly is installed on the moving assembly, the tensioning assembly is installed on the hoisting assembly, and the baffle assembly is installed on the U-shaped bottom frame. When the moving assembly moves, the moving assembly starts the baffle assembly to shield the front side of the U-shaped bottom frame, so that the situation that when the tensioning assembly tensions the steel strands, if the steel strands are broken, the steel strands are broken and hurt workers is prevented, after tensioning is completed, the moving assembly automatically makes contact with the baffle assembly to shield the front side of the U-shaped bottom frame, and convenience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed tensioning equipment, and in particular to a prestressed tensioning device and method for a cast-in-place box girder. Background Art

[0002] In the construction of roads and bridges, prefabricated components are used more and more, and the technology is becoming more mature. Among prefabricated components, prestressing of box girders is a key step in the safe and stable use of components. Box girders produced by box girder factories need to use prestressing equipment to stretch the steel strands in the box girders before leaving the factory, thereby improving the bending resistance and stiffness of the components, delaying the appearance of cracks, and increasing the durability of the components.

[0003] In the prior art, there is a patent document with announcement number CN220261416U, which discloses a prefabricated box girder prestressing tensioning device, including a base, a slide groove is opened on the upper surface of the base, and a screw rod is rotatably connected to the inner wall of one side of the slide groove, and universal wheels distributed at equal distances are fixed to the lower surface of the base, a servo motor is connected to the outer wall of one side of the screw rod through a rotating rod, and a slider is screwed on the surface of the screw rod, a mounting plate is fixed to one side of the upper surface of the slider, and a tensioning machine is fixed to the upper surface of the mounting plate, a jack is connected to the surface of one side of the tensioning machine, and an adjustment mechanism is fixed to the other side of the upper surface of the slider.

[0004] During use, it was found that the above-mentioned device lacked a safety protection device when stretching the steel strands of the box girder. When the steel strands were being tensioned, the pulling force of the through-type jack was huge. If the steel strands broke during tensioning, the steel strands might cause injuries to the personnel in front. The safety needs to be further improved. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a prestressed tensioning device and method for a cast-in-place box girder with improved safety and protection.

[0006] The prestressed tensioning device of a cast-in-place box girder of the present invention comprises a U-shaped bottom frame, legs, a support frame and a support cross beam, wherein the bottom end of the U-shaped bottom frame is provided with multiple groups of legs, the top end of the U-shaped bottom frame is provided with two groups of support frames, and the top ends of the two groups of support cross beams are installed with two groups of support cross beams, and further comprises a moving assembly, a hoisting assembly, a tensioning assembly and a baffle assembly, wherein the moving assembly is installed on the two groups of support cross beams, the moving assembly is installed on the hoisting assembly, the tensioning assembly is installed on the hoisting assembly, and the baffle assembly is installed on the U-shaped bottom frame; when in use, according to The position of the box girder steel strands is determined by operating the moving component to drive the lifting component to move, which further drives the tensioning component to move, and then the tensioning component performs tensioning operations on the box girder steel strands. When the moving component moves, the moving component activates the baffle component to cover the front side of the U-shaped bottom frame, thereby preventing the steel strands from breaking and flying when the tensioning component is tensioning the steel strands, thereby injuring the staff, thereby improving safety protection. After the tensioning is completed, the moving component automatically contacts the baffle component to cover the front side of the U-shaped bottom frame, thereby improving convenience.

[0007] Preferably, the moving assembly includes a No. 1 bracket, a synchronous wheel, a synchronous belt, a side plate, a No. 1 optical bar, a moving crossbeam, a guide wheel, a guide groove and a No. 1 motor. A group of No. 1 brackets are respectively arranged at the top of each group of support frames, a group of synchronous wheels are rotatably installed on each group of No. 1 brackets, the two groups of synchronous wheels are driven by a synchronous belt, a No. 1 motor is installed on a group of No. 1 brackets, the output end of the No. 1 motor is connected to one end of a group of synchronous wheels, a group of guide grooves are respectively arranged at the top of each group of support crossbeams, two groups of side plates are respectively arranged at the top of each group of support crossbeams, a No. 1 optical bar is installed between the two groups of side plates, and the moving crossbeam is slidably connected to the two groups of No. 1 optical bars and The movable crossbeam is connected with the synchronous wheel, and a guide wheel is arranged at the bottom end of the movable crossbeam, which is in rolling contact with the bottom end of the guide groove, and a lifting assembly is installed at the bottom end of the movable crossbeam; when in use, the staff controls the No. 1 motor so that the two sets of synchronous wheels rotate under the cooperation of the synchronous belt, and the synchronous belt drives the movable crossbeam to move backward under the guidance of the No. 1 light bar, and at the same time, the multiple sets of guide wheels at the bottom end of the movable crossbeam rotate adaptively in the corresponding guide groove, so that the movable crossbeam drives the lifting assembly and the tensioning assembly to move, and at the same time, the movable crossbeam starts the baffle assembly to seal and shield the front end of the U-shaped bottom frame to improve safety protection.

[0008] Preferably, the lifting assembly includes a No. 2 motor, a two-way lead screw, a No. 2 optical rod, a moving seat, a No. 1 fixed plate, a No. 3 motor, a motor seat, a winding drum and a wire rope, a concave groove is provided at the bottom end of the moving crossbeam, a two-way lead screw is rotatably provided in the concave groove and a No. 2 optical rod is fixedly provided, two groups of moving seats are respectively threadedly connected with the two-way lead screw and slidably connected with the two groups of No. 2 optical rods, a No. 2 motor is installed on the moving crossbeam, an output end of the No. 2 motor is connected with one end of the two-way lead screw, a group of No. 1 fixed plates are respectively provided at the bottom end of each group of moving seats, two groups of No. 3 motors are respectively installed at the bottom end of the moving seat through a group of motor seats, a rotating shaft is provided at the output end of the No. 3 motor, and the rotating shaft One end is rotatably connected with the adjacent No. 1 fixed plate, and a winding drum is installed on the rotating shaft, and a wire rope is wound on the winding drum, and a tensioning assembly is arranged at the free end of the wire rope; when in use, the staff starts the No. 2 motor according to the spacing between the two groups of steel strands to be tensioned, so that the bidirectional lead screw rotates, and the bidirectional lead screw drives the two groups of moving seats to move close to each other in a mirror image with the cooperation of the No. 2 optical rod, so as to adjust the spacing between the two groups of tensioning assemblies, and then according to the height of the steel strands, the two groups of No. 3 motors are operated to rotate, so that the two groups of winding drums respectively unwind the corresponding steel ropes, thereby realizing the height adjustment of the two groups of tensioning assemblies, improving flexibility and convenience.

[0009] Preferably, the tensioning assembly includes a through-type jack, an anchor and a clamp, the free end of the steel wire rope is provided with a through-type jack, the through-type jack is detachably installed with a through-anchor, and multiple groups of clamps are detachably installed on the through-anchor; when in use, the steel strand is passed through the through-type jack, and then the steel strands are respectively passed through the through-anchors, and then the multiple groups of clamps are respectively mounted on the branch lines of the steel strand, and at the same time the clamps slide into the through-anchor, and then the through-type jack is connected to the hydraulic pump station, and the hydraulic pump station operates the through-type jack to extend, so that the through-anchor performs tensioning operation on the steel strand with the cooperation of multiple groups of clamps, thereby improving the firmness of the tensioning.

[0010] Preferably, the baffle assembly includes a fixed pulley, a traction rope, a second bracket, an outer shell and a lifting plate, wherein a No. 2 bracket is arranged at the top end inside the support frame, a fixed pulley is rotatably arranged on the No. 2 bracket, the outer shell is installed on the U-shaped bottom frame, and a group of lifting plates are slidably arranged inside the outer shell, one end of the traction rope is connected to the top end of the lifting plate, and the other end of the traction rope is connected to one end of the moving crossbeam, and the traction rope passes around the fixed pulley; when it is necessary to tension the box girder steel strand, the synchronous belt drives the moving crossbeam to move, and the moving crossbeam pulls the traction rope under the guidance of the fixed pulley, so that the traction rope pulls the lifting plate inside the outer shell upward, and the lifting plate and the outer shell cooperate to automatically seal the space on the front side of the U-shaped bottom frame to prevent the steel strand from being broken and causing a collapse to injure the people in front, thereby improving safety. After the tensioning is completed, the moving crossbeam adjusts the lifting plate downward through the traction rope to automatically release the obstruction.

[0011] Preferably, it further comprises an alarm component, wherein the alarm component is installed between the lifting plate and the outer shell;

[0012] The alarm assembly includes a shell, a photoelectric signal transmitter, a photoelectric signal receiver, a No. 2 fixing plate, a signal shielding plate and an alarm. The shell is arranged at the front end of the shell, the photoelectric signal transmitter is arranged at the left end of the shell, the photoelectric signal receiver is arranged at the right end of the shell, the No. 2 fixing plate is arranged at the front end of the lifting plate, the signal shielding plate is arranged at the bottom end of the No. 2 fixing plate, the top of the shell is arranged with a socket, the bottom end of the signal shielding plate extends to the inside of the shell through the socket, and the alarm is arranged at the front end of the shell; under normal conditions, the signal shielding plate shields the photoelectric signal emitted by the photoelectric signal transmitter to prevent the photoelectric signal from being received. The receiver receives the photoelectric signal. When the steel strand needs to be tensioned, the lifting plate rises, and the lifting plate further drives the signal shielding plate to rise through the No. 2 fixed plate. The photoelectric signal receiver receives the photoelectric signal sent by the photoelectric signal transmitter, so that the alarm sounds an alarm, so that the lifting plate and the outer shell cooperate with each other to block the front of the U-shaped bottom frame. At the same time, the alarm reminds the people passing by, further improving safety. After the tensioning is completed, the lifting plate is lowered, so that the signal shielding plate re-enters the shell, thereby blocking the photoelectric signal sent by the photoelectric signal transmitter, and the resignation alarm stops the alarm, improving convenience.

[0013] Preferably, it also includes a buffer pad and a limit plate, and a group of limit plates are respectively provided at the left and right ends of the lifting plate, and a group of buffer pads are respectively provided at the bottom end of each group of limit plates; when the lifting plate descends, the limit plate slowly contacts with the top of the outer shell with the cooperation of the buffer pad, thereby preventing the lifting plate from making hard contact with the outer shell and improving the service life.

[0014] Preferably, it also includes a base, and a group of bases are respectively arranged at the bottom end of each group of legs; multiple groups of bases and multiple groups of legs cooperate with each other to stably support the U-shaped bottom frame, thereby improving stability.

[0015] Preferably, it also includes an observation window. The front end of the shell is provided with an observation port, and the observation port is installed with an observation window; the staff observes the inside of the shell through the observation window, which improves convenience.

[0016] A prestressing method for a cast-in-place box beam of the present invention comprises the following steps:

[0017] Step 1: The staff controls the No. 1 motor so that the two sets of synchronous wheels rotate under the cooperation of the synchronous belt. The synchronous belt drives the moving beam to move backward under the guidance of the No. 1 light bar. At the same time, the multiple sets of guide wheels at the bottom of the moving beam rotate adaptively in the corresponding guide grooves, so that the moving beam drives the through-type jack to move;

[0018] Step 2: The moving crossbeam pulls the traction rope under the guidance of the fixed pulley, so that the traction rope pulls the lifting plate inside the outer shell upward, and the lifting plate cooperates with the outer shell to automatically seal the space on the front side of the U-shaped bottom frame.

[0019] Step 3: The lifting plate is raised, and the lifting plate further drives the signal shielding plate to rise through the second fixed plate. The photoelectric signal receiver receives the photoelectric signal sent by the photoelectric signal transmitter, so that the alarm sounds an alarm, so that the lifting plate and the outer shell cooperate with each other to shield the front of the U-shaped bottom frame, and the alarm reminds the people passing by;

[0020] Step 4: Start the No. 2 motor to rotate the bidirectional lead screw, which drives the two sets of moving seats to move in a mirror-like manner with the cooperation of the No. 2 optical rod, so as to adjust the distance between the two sets of through-type jacks. Then, according to the height of the steel strand, operate the two sets of No. 3 motors to rotate, so that the two sets of winding drums can unwind the corresponding steel wire ropes respectively, so as to achieve the height adjustment of the two sets of through-type jacks.

[0021] Step 5. Pass the steel strand through the through-type jack, and then through the anchors respectively. Then, respectively put multiple sets of clamps on the branch lines of the steel strand. At the same time, the clamps slide into the through-type anchor. Then, the through-type jack is connected to the hydraulic pump station. The hydraulic pump station operates the through-type jack to extend, so that the anchor can tension the steel strand with the cooperation of multiple sets of clamps.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: when in use, according to the position of the box girder steel strands, the moving component is operated to drive the lifting component to move, and the lifting component further drives the tensioning component to move, and then the tensioning component performs tensioning operation on the box girder steel strands. When the moving component moves, the moving component activates the baffle component to shield the front side of the U-shaped bottom frame, thereby preventing the steel strands from breaking and flying when the tensioning component is tensioning the steel strands, thereby injuring the staff, thereby improving safety protection. After the tensioning is completed, the moving component automatically contacts the baffle component to shield the front side of the U-shaped bottom frame, thereby improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a first isometric structural schematic diagram of the present invention;

[0024] Figure 2 is a second isometric structural schematic diagram of the present invention;

[0025] Figure 3 It is a schematic diagram of the explosion structure of the present invention;

[0026] Figure 4 It is an enlarged structural diagram of the synchronous belt and No. 1 motor and other structures;

[0027] Figure 5 It is an enlarged structural diagram of the No. 1 light bar and supporting beams;

[0028] Figure 6 It is an enlarged structural diagram of structures such as a moving crossbeam and an outer shell;

[0029] Figure 7 yes Figure 6 A partial enlarged structural diagram of the middle part;

[0030] Figure 8 It is an enlarged structural diagram of the lifting plate and the photoelectric signal receiver;

[0031] Fig. 9 It is an enlarged structural diagram of the moving crossbeam and through-type jack and other structures;

[0032] Fig.10 It is an enlarged structural diagram of the structures such as the No. 2 motor and the No. 3 motor;

[0033] Fig.11 It is an enlarged structural diagram of structures such as a moving seat and a guide wheel;

[0034] Fig.12 It is an enlarged structural diagram of structures such as the winding drum and the clamp.

[0035] Reference numerals in the accompanying drawings: 101, U-shaped bottom frame; 102, supporting legs; 103, supporting frame; 104, supporting beam; 105, base;

[0036] 201, bracket; 202, synchronous wheel; 203, synchronous belt; 204, side plate; 205, No. 1 optical bar; 206, moving crossbeam; 207, guide wheel; 208, guide groove; 209, No. 1 motor; 301, No. 2 motor; 302, bidirectional lead screw; 303, No. 2 optical bar; 304, moving seat; 305, fixed plate; 306, No. 3 motor; 307, motor seat; 308, take-up drum; 309, wire rope;

[0037] 401, through-type jack; 402, anchor; 403, clamp; 501, fixed pulley; 502, traction rope; 503, bracket; 504, outer shell; 505, lifting plate; 506, buffer pad; 507, limit plate; 601, shell; 602, photoelectric signal transmitter; 603, photoelectric signal receiver; 604, fixing plate; 605, signal shielding plate; 606, alarm; 607, observation window. DETAILED DESCRIPTION

[0038] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0039] Example 1

[0040] like Figures 1 to 12 As shown, a prestressed tensioning device for a cast-in-place box girder of the present invention comprises a U-shaped bottom frame 101, legs 102, support frames 103 and support beams 104, wherein a plurality of groups of legs 102 are arranged at the bottom end of the U-shaped bottom frame 101, two groups of support frames 103 are arranged at the top end of the U-shaped bottom frame 101, and two groups of support beams 104 are installed at the top ends of the two groups of support frames 103, and further comprises a moving assembly, a hoisting assembly, a tensioning assembly and a baffle assembly, wherein the moving assembly is installed on the two groups of support beams 104, the hoisting assembly is installed on the moving assembly, the tensioning assembly is installed on the hoisting assembly, and the baffle assembly is installed on the U-shaped bottom frame 101;

[0041] The moving assembly includes a No. 1 bracket 201, a synchronous wheel 202, a synchronous belt 203, a side plate 204, a No. 1 optical bar 205, a moving crossbeam 206, a guide wheel 207, a guide groove 208 and a No. 1 motor 209. A No. 1 bracket 201 is provided at the top of each group of support frames 103. A group of synchronous wheels 202 are rotatably mounted on each group of No. 1 brackets 201. The two groups of synchronous wheels 202 are driven by the synchronous belt 203. A No. 1 motor 209 is installed on a group of No. 1 brackets 201. The output end of the No. 1 motor 209 is connected to a group of synchronous wheels. One end of the step wheel 202 is connected, each group of supporting beams 104 is respectively provided with a group of guide grooves 208 at the top, each group of supporting beams 104 is respectively provided with two groups of side plates 204 at the top, a No. 1 light bar 205 is installed between the two groups of side plates 204, a moving beam 206 is slidably connected with the two groups of No. 1 light bars 205 and the moving beam 206 is connected with the synchronous wheel 202, a guide wheel 207 is provided at the bottom end of the moving beam 206, the guide wheel 207 is in rolling contact with the bottom end of the guide groove 208, and a hoisting assembly is installed at the bottom end of the moving beam 206;

[0042] The hoisting assembly includes a No. 2 motor 301, a bidirectional lead screw 302, a No. 2 optical rod 303, a moving seat 304, a No. 1 fixed plate 305, a No. 3 motor 306, a motor seat 307, a winding drum 308 and a wire rope 309. The bottom end of the moving crossbeam 206 is provided with a concave groove, in which the bidirectional lead screw 302 is rotatably arranged and the No. 2 optical rod 303 is fixedly arranged. Two groups of moving seats 304 are respectively threadedly connected with the bidirectional lead screw 302 and slidably connected with the two groups of No. 2 optical rods 303. The No. 2 motor 306 is installed on the moving crossbeam 206. 1. The output end of the No. 2 motor 301 is connected to one end of the bidirectional lead screw 302. A group of No. 1 fixed plates 305 are respectively provided at the bottom of each group of moving seats 304. Two groups of No. 3 motors 306 are respectively installed at the bottom of the moving seats 304 through a group of motor seats 307. A rotating shaft is provided at the output end of the No. 3 motor 306. One end of the rotating shaft is rotatably connected to the adjacent No. 1 fixed plate 305. A winding drum 308 is installed on the rotating shaft. A steel wire rope 309 is wound around the winding drum 308. A tensioning component is provided at the free end of the steel wire rope 309.

[0043] The tensioning assembly includes a through-type jack 401, a through-anchor 402 and a clamp 403. The free end of the steel wire 309 is provided with a through-type jack 401, and a through-anchor 402 is detachably installed inside the through-type jack 401. The through-anchor 402 is detachably installed with multiple sets of clamps 403.

[0044] The baffle assembly includes a fixed pulley 501, a traction rope 502, a No. 2 bracket 503, an outer shell 504 and a lifting plate 505. The No. 2 bracket 503 is arranged at the top of the support frame 103, the No. 2 bracket 503 is rotatably arranged with the fixed pulley 501, the outer shell 504 is installed on the U-shaped bottom frame 101, and a group of lifting plates 505 are slidably arranged inside the outer shell 504. One end of the traction rope 502 is connected to the top of the lifting plate 505, and the other end of the traction rope 502 is connected to one end of the moving beam 206, and the traction rope 502 passes around the fixed pulley 501;

[0045] It also includes an alarm component, which is installed between the lifting plate 505 and the outer shell 504;

[0046] The alarm assembly includes a shell 601, a photoelectric signal transmitter 602, a photoelectric signal receiver 603, a second fixing plate 604, a signal shielding plate 605 and an alarm 606. The shell 601 is arranged at the front end of the shell 504, the photoelectric signal transmitter 602 is arranged at the left end inside the shell 601, the photoelectric signal receiver 603 is arranged at the right end inside the shell 601, the second fixing plate 604 is arranged at the front end of the lifting plate 505, the signal shielding plate 605 is arranged at the bottom end of the second fixing plate 604, the top of the shell 601 is arranged with a socket, the bottom end of the signal shielding plate 605 extends to the inside of the shell 601 through the socket, and the alarm 606 is arranged at the front end of the shell 504;

[0047] It also includes a buffer pad 506 and a limit plate 507. A group of limit plates 507 are respectively provided at the left and right ends of the lifting plate 505, and a group of buffer pads 506 are respectively provided at the bottom end of each group of limit plates 507;

[0048] It also includes a base 105, and each set of legs 102 has a set of bases 105 at the bottom end;

[0049] It also includes an observation window 607. The front end of the shell 601 is provided with an observation port, and the observation window 607 is installed on the observation port.

[0050] In this embodiment, when in use, the staff controls the No. 1 motor 209, so that the two sets of synchronous wheels 202 rotate with the cooperation of the synchronous belt 203, and the synchronous belt 203 drives the movable beam 206 to move backward under the guidance of the No. 1 optical bar 205. At the same time, the multiple sets of guide wheels 207 at the bottom of the movable beam 206 rotate adaptively in the corresponding guide grooves 208, so that the movable beam 206 drives the lifting assembly and the tensioning assembly to move. The staff starts the No. 2 motor 301 according to the spacing of the two sets of steel strands to be tensioned, so that the bidirectional screw 302 rotates. The bidirectional screw 302 drives the two sets of movable seats 304 to move closer in a mirror image with the cooperation of the No. 2 optical bar 303, so as to adjust the spacing between the two sets of tensioning assemblies, and then adjusts the spacing according to the height of the steel strands. , operate the two groups of No. 3 motors 306 to rotate, so that the two groups of winding drums 308 can unwind the corresponding steel wire ropes 309 respectively, so as to realize the height adjustment of the two groups of tensioning components, pass the steel strand through the through-type jack 401, and then the steel strands pass through the through-anchor 402 respectively, and then the multiple groups of clamps 403 are respectively mounted on the branch lines of the steel strand, and at the same time the clamps 403 slide into the through-anchor 402, and then the through-type jack 401 is connected to the hydraulic pump station, and the hydraulic pump station operates the through-type jack 401 to extend, so that the through-anchor 402 can tension the steel strand with the cooperation of the multiple groups of clamps 403, and when the lifting plate 505 is raised, the lifting plate 505 and the outer shell 504 block the front side of the U-shaped bottom frame 101, and the alarm 606 sounds an alarm.

[0051] Example 2

[0052] like Figures 1 to 12 As shown, a prestressing method for cast-in-place box beams of the present invention comprises the following steps:

[0053] Step 1: The staff controls the No. 1 motor 209, so that the two sets of synchronous wheels 202 rotate under the cooperation of the synchronous belt 203. The synchronous belt 203 drives the moving beam 206 to move backward under the guidance of the No. 1 optical bar 205. At the same time, the multiple sets of guide wheels 207 at the bottom of the moving beam 206 rotate adaptively in the corresponding guide grooves 208, so that the moving beam 206 drives the through-type jack 401 to move;

[0054] Step 2: The movable crossbeam 206 pulls the traction rope 502 under the guidance of the fixed pulley 501, so that the traction rope 502 pulls the lifting plate 505 inside the outer shell 504 upward, and the lifting plate 505 cooperates with the outer shell 504 to automatically seal the space on the front side of the U-shaped bottom frame 101.

[0055] Step 3: The lifting plate 505 is raised, and the lifting plate 505 further drives the signal shielding plate 605 to be raised through the second fixing plate 604. The photoelectric signal receiver 603 receives the photoelectric signal emitted by the photoelectric signal transmitter 602, so that the alarm 606 emits an alarm sound, thereby realizing that the lifting plate 505 and the outer shell 504 cooperate with each other to shield the front of the U-shaped bottom frame 101, and the alarm 606 reminds the people passing by;

[0056] Step 4: Start the No. 2 motor 301 to rotate the bidirectional lead screw 302. The bidirectional lead screw 302 drives the two sets of moving seats 304 to move in a mirror-like manner in cooperation with the No. 2 optical rod 303, thereby adjusting the distance between the two sets of through-type jacks 401. Then, according to the height of the steel strand, operate the two sets of No. 3 motors 306 to rotate, so that the two sets of winding drums 308 respectively unwind the corresponding steel wire ropes 309, thereby realizing the height adjustment of the two sets of through-type jacks 401.

[0057] Step 5. Pass the steel strand through the through-type jack 401, and then pass the steel strand through the anchor 402 respectively. Then, respectively put multiple sets of clamps 403 on the branch lines of the steel strand. At the same time, the clamps 403 slide into the through-type anchor 402. Then, the through-type jack 401 is connected to the hydraulic pump station. The hydraulic pump station operates the through-type jack 401 to extend, so that the anchor 402 can tension the steel strand with the cooperation of the multiple sets of clamps 403.

[0058] A cast-in-place box girder prestressing tensioning device and method of the present invention, a controller is arranged inside the shell 601, and the controller is electrically connected to the photoelectric signal transmitter 602, the photoelectric signal receiver 603 and the alarm 606. The No. 1 motor 209, the No. 2 motor 301, the No. 3 motor 306, the through-type jack 401, the through-anchor 402, the photoelectric signal transmitter 602, the photoelectric signal receiver 603 and the alarm 606 of the cast-in-place box girder prestressing tensioning device and method of the present invention are purchased on the market, and the technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without the need for the technical personnel in this field to make creative labor.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cast-in-place box girder prestressing tensioning device, comprising a U-shaped bottom frame (101), legs (102), a support frame (103) and a support beam (104), wherein the bottom end of the U-shaped bottom frame (101) is provided with a plurality of groups of legs (102), the top end of the U-shaped bottom frame (101) is provided with two groups of support frames (103), and the top ends of the two groups of support frames (103) are provided with two groups of support beams (104), characterized in that: It also comprises a moving assembly, a hoisting assembly, a tensioning assembly and a baffle assembly, wherein the moving assembly is mounted on two groups of supporting beams (104), the moving assembly is mounted on the hoisting assembly, the tensioning assembly is mounted on the hoisting assembly, and the baffle assembly is mounted on the U-shaped bottom frame (101).

2. A cast-in-place box girder prestressing tensioning device as claimed in claim 1, characterized in that: The moving assembly comprises a No. 1 bracket (201), a synchronous wheel (202), a synchronous belt (203), a side plate (204), a No. 1 optical bar (205), a moving crossbeam (206), a guide wheel (207), a guide groove (208) and a No. 1 motor (209). A No. 1 bracket (201) is respectively arranged at the top of each group of support frames (103). A No. 1 bracket (201) is respectively rotatably mounted on each group of No. 1 brackets (201). The two groups of synchronous wheels (202) are driven by the synchronous belt (203). A No. 1 motor (209) is installed on a group of No. 1 brackets (201). The output end of the No. 1 motor (209) is connected to a The movable crossbeam (206) is connected to one end of a group of synchronous wheels (202), a group of guide grooves (208) are respectively arranged at the top of each group of supporting crossbeams (104), two groups of side plates (204) are respectively arranged at the top of each group of supporting crossbeams (104), a No. 1 optical bar (205) is installed between the two groups of side plates (204), a movable crossbeam (206) is slidably connected to the two groups of No. 1 optical bars (205) and the movable crossbeam (206) is connected to the synchronous wheel (202), a guide wheel (207) is arranged at the bottom end of the movable crossbeam (206), the guide wheel (207) is in rolling contact with the bottom end of the guide groove (208), and a hoisting assembly is installed at the bottom end of the movable crossbeam (206).

3. A cast-in-place box girder prestressing tensioning device as claimed in claim 2, characterized in that: The hoisting assembly comprises a No. 2 motor (301), a bidirectional lead screw (302), a No. 2 optical rod (303), a moving seat (304), a No. 1 fixed plate (305), a No. 3 motor (306), a motor seat (307), a winding drum (308) and a wire rope (309); a concave groove is arranged at the bottom end of the moving crossbeam (206); a bidirectional lead screw (302) is rotatably arranged in the concave groove and a No. 2 optical rod (303) is fixedly arranged; two groups of moving seats (304) are respectively threadedly connected to the bidirectional lead screw (302) and are slidably connected to the two groups of No. 2 optical rods (303); a No. 2 motor is installed on the moving crossbeam (206); (301), the output end of the No. 2 motor (301) is connected to one end of the bidirectional lead screw (302), a group of No. 1 fixed plates (305) are respectively arranged at the bottom end of each group of moving seats (304), two groups of No. 3 motors (306) are respectively installed at the bottom end of the moving seats (304) through a group of motor seats (307), a rotating shaft is arranged at the output end of the No. 3 motor (306), one end of the rotating shaft is rotatably connected to the adjacent No. 1 fixed plate (305), a winding drum (308) is installed on the rotating shaft, a steel wire rope (309) is wound around the winding drum (308), and a tensioning component is arranged at the free end of the steel wire rope (309).

4. A cast-in-place box girder prestressing tensioning device as claimed in claim 3, characterized in that: The tensioning assembly comprises a through-type jack (401), a through-anchor (402) and a clamp (403); the free end of the steel wire rope (309) is provided with a through-type jack (401); the through-anchor (402) is detachably installed inside the through-type jack (401); and a plurality of groups of clamps (403) are detachably installed on the through-anchor (402).

5. A cast-in-place box girder prestressing tensioning device as claimed in claim 2, characterized in that: The baffle assembly comprises a fixed pulley (501), a traction rope (502), a second bracket (503), an outer shell (504) and a lifting plate (505); the second bracket (503) is arranged at the top end inside the support frame (103); the fixed pulley (501) is rotatably arranged on the second bracket (503); the outer shell (504) is installed on the U-shaped bottom frame (101); a group of lifting plates (505) are slidably arranged inside the outer shell (504); one end of the traction rope (502) is connected to the top end of the lifting plate (505); the other end of the traction rope (502) is connected to one end of the moving crossbeam (206); and the traction rope (502) is passed around the fixed pulley (501).

6. A cast-in-place box girder prestressing tensioning device as claimed in claim 5, characterized in that: It also includes an alarm component, which is installed between the lifting plate (505) and the outer shell (504); The alarm component comprises a shell (601), a photoelectric signal transmitter (602), a photoelectric signal receiver (603), a second fixing plate (604), a signal shielding plate (605) and an alarm (606); the shell (601) is arranged at the front end of the shell (504); the photoelectric signal transmitter (602) is arranged at the left end inside the shell (601); the photoelectric signal receiver (603) is arranged at the right end inside the shell (601); the second fixing plate (604) is arranged at the front end of the lifting plate (505); the signal shielding plate (605) is arranged at the bottom end of the second fixing plate (604); a socket is arranged at the top end of the shell (601); the bottom end of the signal shielding plate (605) extends to the inside of the shell (601) through the socket; and the alarm (606) is arranged at the front end of the shell (504).

7. A cast-in-place box girder prestressing tensioning device as claimed in claim 5, characterized in that: It also includes a buffer pad (506) and a limit plate (507), wherein a group of limit plates (507) are respectively arranged at the left and right ends of the lifting plate (505), and a group of buffer pads (506) are respectively arranged at the bottom end of each group of limit plates (507).

8. The prestressed tensioning device for cast-in-place box beam according to claim 1, characterized in that: It also includes a base (105), and a group of bases (105) are respectively arranged at the bottom end of each group of supporting legs (102).

9. A cast-in-place box girder prestressing tensioning device as claimed in claim 6, characterized in that: It also includes an observation window (607); the front end of the housing (601) is provided with an observation port, and the observation window (607) is installed on the observation port.

10. A method for prestressing a cast-in-place box beam, characterized in that: The following steps are involved: Step 1: The staff controls the No. 1 motor (209), so that the two sets of synchronous wheels (202) rotate in cooperation with the synchronous belt (203), and the synchronous belt (203) drives the moving beam (206) to move backward under the guidance of the No. 1 optical bar (205), and at the same time, the multiple sets of guide wheels (207) at the bottom of the moving beam (206) rotate adaptively in the corresponding guide grooves (208), so that the moving beam (206) drives the through-type jack (401) to move; Step 2: The movable crossbeam (206) pulls the traction rope (502) under the guidance of the fixed pulley (501), so that the traction rope (502) pulls the lifting plate (505) inside the outer shell (504) upward, and the lifting plate (505) cooperates with the outer shell (504) to automatically seal the space on the front side of the U-shaped bottom frame (101). Step 3: The lifting plate (505) is raised, and the lifting plate (505) further drives the signal shielding plate (605) to rise through the second fixing plate (604), and the photoelectric signal receiver (603) receives the photoelectric signal emitted by the photoelectric signal transmitter (602), so that the alarm (606) emits an alarm sound, thereby realizing that the lifting plate (505) and the outer shell (504) cooperate with each other to shield the front of the U-shaped bottom frame (101) while the alarm (606) reminds the people passing by; Step 4: Start the second motor (301) to rotate the bidirectional lead screw (302). The bidirectional lead screw (302) drives the two sets of moving seats (304) to move in a mirror-like manner with the cooperation of the second optical rod (303), thereby adjusting the distance between the two sets of through-type jacks (401). Then, according to the height of the steel strand, operate the two sets of third motors (306) to rotate, so that the two sets of winding drums (308) respectively unwind the corresponding steel wire ropes (309), thereby realizing the height adjustment of the two sets of through-type jacks (401); Step 5. Pass the steel strand through the through-type jack (401), and then pass the steel strand through the anchor (402) respectively. Then, respectively, put multiple sets of clamps (403) on the branch lines of the steel strand, and at the same time, the clamps (403) slide into the anchor (402). Then, the through-type jack (401) is connected to the hydraulic pump station, and the hydraulic pump station operates the through-type jack (401) to extend, so that the anchor (402) can tension the steel strand with the cooperation of the multiple sets of clamps (403).

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