CN115571780A - A kind of prefabricated box girder flip telescopic spreader and using method - Google Patents

Abstract

The invention provides a prefabricated box girder flip telescopic spreader and its use method, which comprises a hanging beam, sliding arms that slide relatively on both sides of the hanging beam, and a sliding lifting and turning mechanism at the end of the sliding arm, and the lifting and turning mechanism The two ends of the sliding seat are provided with bolts that slide left and right, and the bolt at one end also slides back and forth against the inside of the sliding seat. A rotating arm is provided on the outside of the sliding seat, and a stop bar that slides back and forth is provided at the end of the rotating arm; the latch is inserted into the In the lifting holes on both sides of the prefabricated box culvert, the retaining rods are against the bottom of the prefabricated box culvert. The telescopic adjustment structure of the spreader can hoist prefabricated box culverts of various sizes. When turning over, the fourth hydraulic cylinder drives the stop bar against the bottom of the prefabricated box culvert, thereby pushing the end of the prefabricated box culvert to tilt up, which is convenient for the third The hydraulic cylinder drives the bolt out of the lifting hole, so that the prefabricated box culvert can rotate around the bolt fixed in the lifting hole due to its own weight, and the slow release of the fourth hydraulic cylinder can ensure the stability of the prefabricated box culvert turning over.

Description

A kind of prefabricated box girder flip telescopic spreader and using method

technical field

The invention relates to the technical field of engineering hoisting, in particular to a prefabricated box girder overturning retractable hanger and a use method.

Background technique

In recent years, for the hoisting construction of prefabricated box culverts, the main construction techniques for prefabricated box culverts of different sizes are as follows: ① The hoisting of prefabricated box culverts is divided into two steps: flat hoisting and flipping, and two kinds of hoisting tools are usually used. ② Among the existing prefabricated box culvert spreaders, the patent document CN209411599U discloses a prefabricated box culvert construction flip-type spreader and prefabricated box culvert hoisting construction technology, the spreader combines two kinds of spreaders, the flat hanger and the flipper, into one . Patent document CN215592373U discloses a simple rotating spreader for prefabricated box culverts. The spreader combines the two spreaders of flat hanging and flipping into one. It is necessary to manually adjust the position of the hanging block frequently for different box culverts to complete the prefabrication. Box culvert hoisting.

In the above construction, the construction method of using two kinds of spreaders and one kind of spreader to complete the prefabricated box culvert horizontal hoisting and turning over is the most common prefabricated box culvert hoisting construction method at present. For the use of two kinds of spreaders to complete the precast box culvert hoisting, It is necessary to process spreaders of different sizes, frequent replacement of spreaders, poor turnover, low construction efficiency, and high construction costs; for the use of a spreader to complete the hoisting of prefabricated box culverts, it is necessary to manually adjust the position of the hanging block frequently for different box culverts. The degree of mechanization is not high and the applicability is poor.

Contents of the invention

The main purpose of the present invention is to provide a prefabricated box girder flip telescopic spreader and its use method, so as to solve the above-mentioned problems in the background technology.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: comprising a suspension beam, the two sides of the suspension beam are provided with relatively sliding slide arms, the end of the slide arm is provided with a sliding hoisting and turning mechanism, and the sliding seat in the lifting and turning mechanism Both ends are provided with bolts that slide left and right, and the bolt at one end also slides back and forth against the sliding seat. A rotating arm is provided on the outside of the sliding seat, and a stop bar that slides back and forth is provided at the end of the rotating arm;

The bolt is inserted into the lifting holes on both sides of the prefabricated box culvert, and the retaining rod is against the bottom of the prefabricated box culvert.

In the optimal scheme, the hanging beam is composed of two I-beams, and slide rails are fixed on both sides of the I-beam, and a plurality of sliding blocks are arranged on the slide rails, and the sliding arm is arranged between the two I-beams, and the slide rails are fixed on both sides. A fixed plate at the top of the arm is fixed to the slider.

In the preferred solution, the middle part of the I-beam is fixed with a hoisting connection part, one side of the I-beam is fixed with a motor, and a two-way screw rod is installed between the two I-beams, and the two-way screw rod is against the I-beam through the bearing seat. Rotate upward, the motor is connected with the two-way screw rod through the driving structure, and the thread sleeve in the sliding arm is threadedly connected with the two-way screw rod;

The motor drives the two-way screw to rotate through the driving structure, so that the sliding arms on both sides move relatively.

In the preferred solution, the bottom of the sliding arm is fixed with a first hinged seat, the top is fixed with a fixed plate, the inside of the sliding arm is fixed with a through wire sleeve, the first hinged seat is provided with a hinged first hydraulic cylinder, and the first hinged Guide sleeves are fixed on both sides of the seat.

In the preferred solution, the middle part of the sliding seat in the hoisting and turning mechanism is fixed with a second hinged seat, and both sides of the second hinged seat are fixed with guide columns, and the guide columns slide against the guide sleeve, and the piston rod end of the first hydraulic cylinder The part is hinged in the second hinge seat.

In a preferred solution, both ends of the sliding seat are provided with a through chute, and a sliding sleeve is provided in the chute, and the latch slides against the sliding sleeve.

In the preferred solution, a plurality of threaded holes are provided on one side of the chute, and corresponding through holes are provided on one side of the sliding sleeve, and the fixing bolts pass through the through holes to connect with the threaded holes, thereby fixing the sliding sleeve;

The sliding sleeve at one end is provided with a screw-connected plug, and the plug fixes the latch in the sliding sleeve;

The end of the sliding sleeve at the other end is provided with a third hydraulic cylinder, a connecting sleeve is fixed between the third hydraulic cylinder and the sliding sleeve, and the end of the piston rod of the third hydraulic cylinder is threadedly connected to the latch.

In the preferred solution, a rotating shaft is provided in the middle of the sliding seat, the end of the rotating arm is sleeved on the rotating shaft, and the rotating shaft rotates against the sliding seat through the bearing, and baffles are fixed at both ends of the rotating shaft, and the baffles are against the rotating arm. With the bearing in the sliding seat.

In the preferred solution, a hinge shaft is fixed on one side of the end of the sliding seat, and a hinged fourth hydraulic cylinder is arranged on the hinge shaft, and the end of the piston rod of the fourth hydraulic cylinder is hinged on the rotating arm;

A second hydraulic cylinder is fixed on one side of the end of the rotating arm, and the end of the piston rod of the second hydraulic cylinder is threadedly connected with the blocking rod.

The method is: S1. According to the size of the prefabricated box culvert, drive the motor to adjust the distance between the hanging beams on both sides, and drive the first hydraulic cylinder to adjust the distance between the hoisting turning mechanism and the hanging beams;

S2. Use lifting equipment to move the spreader to the top of the prefabricated box culvert, and lower the spreader so that the bolts are aligned with the pre-buried lifting holes on the prefabricated box culvert, and the driving motor drives the lifting beam to move relatively, so that the bolts are inserted into the lifting holes , lift the prefabricated box culvert by lifting equipment;

S3. The prefabricated box culvert is hoisted and transferred to the transportation equipment by the spreader, and then the prefabricated box culvert is transported to the construction site;

S4. At the construction site, the prefabricated box culvert needs to be turned over and installed, and the prefabricated box culvert is lifted and moved to the designated place by repeating S2 with the spreader;

S5. Drive the second hydraulic cylinder to push out the blocking rod, and then drive the fourth hydraulic cylinder to drive the rotating arm to rotate, so that the blocking rod is against the bottom of the prefabricated box culvert, thereby pushing up one end of the prefabricated box culvert, driving the third The hydraulic cylinder withdraws the pin from the lifting hole;

S6. Slowly releasing the fourth hydraulic cylinder can make the prefabricated box culvert rotate around the bolt fixed in the hoisting hole by its own weight, so that the prefabricated box culvert is turned 90°, and then placed to the designated place by the lifting equipment.

The present invention provides a prefabricated box girder flip telescopic spreader and its use method, the beneficial effects are as follows:

1. By adjusting the distance between the sliding arms on both sides and the distance between the hoisting turning mechanism and the hanging beam, it can be applied to the hoisting of prefabricated box culverts of different sizes;

2. The distance between the sliding pins at both ends of the sliding seat can be adjusted, so that it can be applied to the lifting holes of prefabricated box culverts with different distances;

3. When hoisting, the bolts on both sides are against the lifting holes of the prefabricated box culvert, and there are four lifting points in total to ensure the hoisting stability of the prefabricated box culvert;

4. When overturning, the fourth hydraulic cylinder drives the stop bar against the bottom of the prefabricated box culvert, thereby pushing the end of the prefabricated box culvert to tilt up, which is convenient for the third hydraulic cylinder to drive the bolt out of the lifting hole, so that the prefabricated box can be The culvert rotates around the pin fixed in the lifting hole due to its own weight, and the slow release of the fourth hydraulic cylinder can ensure the stability of the prefabricated box culvert turning over.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Fig. 1 is that overall structure of the present invention plays the schematic diagram of prefabricated box culvert;

Fig. 2 is a schematic diagram of an overturned prefabricated box culvert with an overall structure of the present invention;

Fig. 3 is an axial side view of the overall structure of the present invention;

Fig. 4 is a side view of the suspension beam axis of the present invention;

Fig. 5 is a top view of the suspension beam of the present invention;

Fig. 6 is A-A sectional view of the present invention;

Fig. 7 is a side view of the sliding arm shaft of the present invention;

Fig. 8 is a top view of the hoisting and turning mechanism of the present invention;

Fig. 9 is an exploded view of the axial side of the hoisting and turning mechanism of the present invention;

Fig. 10 is B-B sectional view of the present invention;

Fig. 11 is a C-C sectional view of the present invention;

Figure 12 is a D-D sectional view of the present invention;

In the figure: prefabricated box culvert 1; hanging hole 101; hanging beam 2; I-beam 201; slider 202; slide rail 203; Wire sleeve 302; guide sleeve 303; first hinged seat 304; first hydraulic cylinder 305; hoisting and turning mechanism 4; sliding seat 401; guide column 402; second hinged seat 403; rotating arm 404; The second hydraulic cylinder 407; the third hydraulic cylinder 408; the rotating shaft 409; the baffle plate 410; the chute 411; the sliding sleeve 412; the fixing bolt 413;

detailed description

Example 1

As shown in Figures 1 to 12, a prefabricated box girder flip telescopic spreader and its use method include a hanging beam 2, sliding arms 3 are provided on both sides of the hanging beam 2, and sliding arms 3 are provided at the end of the sliding arm 3. The two ends of the sliding seat 401 in the lifting and turning mechanism 4 are provided with latches 405 that slide left and right, and the latch 405 at one end also slides against the sliding seat 401 back and forth, and the outer side of the sliding seat 401 is provided with a rotating arm 404, the end of the rotating arm 404 is provided with a stop bar 406 that slides back and forth;

The bolt 405 is inserted into the hanging holes 101 on both sides of the prefabricated box culvert 1 , and the stop rod 406 is against the bottom of the prefabricated box culvert 1 . With this structure, two lifting holes 101 are pre-embedded on both sides of the prefabricated box culvert 1, so that the bolt 405 abuts against the lifting holes 101 to form four lifting points, and the prefabricated box culvert 1 can be lifted and transferred stably. . The relatively sliding sliding arm 3 and the hoisting turning mechanism 4 can adjust the size of the spreader, so that it is suitable for hoisting prefabricated box culverts 1 of various sizes. The bolt 405 that slides left and right can adjust the spacing, so that the bolt 405 can be inserted into the hanging holes 101 with various spacings. When overturning, the rotating arm 404 rotates so that the stop bar 406 is against the bottom of the prefabricated box culvert 1, and the bottom of the prefabricated box culvert 1 is pushed by the stop bar 406 so that the end of the prefabricated box culvert 1 is tilted, so that one end The pin 405 of the bolt exits the lifting hole 101, thereby forming two parallel lifting points. With the two parallel lifting points as the center, the prefabricated box culvert 1 can be turned over by its own weight, and the fourth hydraulic cylinder 417 is slowly released so that the stop rod 406 supports it. The prefabricated box culvert 1 is used to prevent the prefabricated box culvert 1 from overturning too quickly and causing impact.

In the preferred solution, the suspension beam 2 is made up of two I-beams 201, the two sides of the I-beam 201 are fixed with slide rails 203, the slide rails 203 are provided with a plurality of sliding sliders 202, and the slide arms 3 are located on two Between the I-beams 201 , the fixing plate 301 on the top of the sliding arm 3 is fixed on the sliding block 202 . With this structure, the I-beam 201 has good torque resistance, and the stability of the hoisting can be guaranteed when the prefabricated box culvert 1 is hoisted. The sliding arm 3 moves against the sliding rail 203 through the sliding block 202, and the movement is smoother. reliable. The two I-beams 201 are welded together firmly, and there is a gap between them, and the sliding arm 3 moves in the gap.

In the preferred solution, the middle part of the I-beam 201 is fixed with a hoisting connection part 204, one side of the I-beam 201 is fixed with a motor 205, and a two-way screw 206 is arranged between the two I-beams 201, and the two-way screw 206 passes through the bearing The seat leans against the I-beam 201 to rotate, the motor 205 is connected with the two-way screw mandrel 206 through the driving structure, and the thread sleeve 302 in the slide arm 3 is threadedly connected with the two-way screw mandrel 206;

The motor 205 drives the two-way screw rod 206 to rotate through the driving structure, so that the sliding arms 3 on both sides move relatively. With this structure, the driving structure can be gear meshing transmission or sprocket chain transmission. In this example, bevel gear transmission is adopted, and the motor 205 drives the two-way screw mandrel 206 to rotate through the bevel gear. The two ends of the two-way screw rod 206 are threads with opposite directions of rotation, and the threads are respectively threadedly connected with the thread sleeves 302 in the two sliding arms 3, so that the motor 205 drives the two-way screw rod 206 to rotate, which can drive the two sliding arms 3 to move relative to each other. .

In the preferred solution, the bottom of the sliding arm 3 is fixed with a first hinged seat 304, the top is fixed with a fixed plate 301, the inside of the sliding arm 3 is fixed with a through wire sleeve 302, and the first hinged seat 304 is provided with a hinged first Guide sleeves 303 are fixed on both sides of the hydraulic cylinder 305 and the first hinged seat 304 . With this structure, the cylinder barrel of the first hydraulic cylinder 305 is hinged on the first hinge seat 304, and the piston rod is hinged on the hoisting and turning mechanism 4, so that the lifting and turning mechanism 4 can be pushed up and down by the first hydraulic cylinder 305.

In the preferred solution, the middle part of the sliding seat 401 in the hoisting and turning mechanism 4 is fixed with a second hinged seat 403, and both sides of the second hinged seat 403 are fixed with guide posts 402, and the guide posts 402 slide against the guide sleeve 303. The piston rod end of a hydraulic cylinder 305 is hinged in the second hinge seat 403 . With this structure, the sliding seat 401 slides against the guide sleeve 303 through the guide post 402 , and the sliding is smoother and more reliable. The first hydraulic cylinder 305 pushes the sliding seat 401 to slide up and down.

In a preferred solution, two ends of the sliding seat 401 are provided with through sliding slots 411 , and sliding sliding sleeves 412 are provided in the sliding slots 411 , and the latch pin 405 slides against the sliding sleeves 412 . With this structure, the bolt 405 slides against the sliding groove 411 through the sliding sleeve 412 , so that the distance between the two bolts 405 can be adjusted, and the lifting holes 101 with different distances can be applied.

In the preferred solution, a plurality of threaded holes are provided on one side of the chute 411, and a corresponding through hole is provided on one side of the sliding sleeve 412, and the fixing bolt 413 passes through the through hole to connect with the threaded hole, thereby fixing the sliding sleeve 412;

The sliding sleeve 412 at one end is provided with a threaded plug 414, and the plug 414 abuts and fixes the latch 405 in the sliding sleeve 412;

The end of the sliding sleeve 412 at the other end is provided with a third hydraulic cylinder 408, and a connecting sleeve 415 is fixed between the third hydraulic cylinder 408 and the sliding sleeve 412, and the end of the piston rod of the third hydraulic cylinder 408 is threadedly connected to the latch 405. . With this structure, the sliding sleeve 412 is fixed on the sliding groove 411 through the fixing bolt 413 . The latch 405 in the sliding sleeve 412 at one end is a fixed end, and the latch 405 in the sliding sleeve 412 at the other end is a telescopic end. The pin 405 at the fixed end is fixed in the sliding sleeve 412 through the plug 414 , and the pin 405 at the telescopic end is pushed against the connecting sleeve 415 and the sliding groove 411 by the third hydraulic cylinder 408 to slide, so that the pin 405 can be withdrawn from the lifting hole 101 .

In a preferred solution, a rotating shaft 409 is provided in the middle of the sliding seat 401, the end of the rotating arm 404 is sleeved on the rotating shaft 409, the rotating shaft 409 is rotated against the sliding seat 401 through a bearing, and baffles 410 are fixed at both ends of the rotating shaft 409 , the baffle plate 410 abuts against the rotating arm 404 and the bearing in the sliding seat 401 . With this structure, the two ends of the rotating shaft 409 lean against the sliding seat 401 to rotate through bearings, the end of the rotating arm 404 is sleeved on the rotating shaft 409 through a key, and the rotating arm 404 and the rotating shaft 409 are fixed by the baffle plate 410 .

In a preferred solution, a hinge shaft 416 is fixed on one side of the end of the sliding seat 401, and a hinged fourth hydraulic cylinder 417 is provided on the hinge shaft 416, and the end of the piston rod of the fourth hydraulic cylinder 417 is hinged on the rotating arm 404;

A second hydraulic cylinder 407 is fixed on one side of the end of the rotating arm 404 , and the end of the piston rod of the second hydraulic cylinder 407 is threadedly connected with the blocking rod 406 . With this structure, the fourth hydraulic cylinder 417 can push and drive the rotating arm 404 to rotate, push upward to make the stop rod 406 abut against the bottom of the prefabricated box culvert 1, push the end of the prefabricated box culvert 1 up; Release the impact that can limit the self-weight rotation of the prefabricated box culvert 1 . The second hydraulic cylinder 407 can push the blocking rod 406 in and out to the bottom of the prefabricated box culvert 1. When hoisting, the blocking rod 406 retracts into the rotating arm 404. When turning over, the blocking rod 406 pushes against the prefabricated box culvert 1 bottom.

Example 2

As shown in Figures 1 to 12, it is further described in conjunction with Embodiment 1: the method is: according to the size of the prefabricated box culvert 1, the driving motor 205 adjusts the distance between the hanging beams 2 on both sides, and drives the first hydraulic cylinder 305 to adjust the lifting and turning over The distance between the mechanism 4 and the hanging beam 2; use the lifting equipment to move the spreader above the prefabricated box culvert 1, and lower the spreader so that the latch 405 is aligned with the pre-buried lifting hole 101 on the prefabricated box culvert 1, and the drive motor 205 Drive the lifting beam 2 to move relatively, so that the latch 405 is inserted into the lifting hole 101, and the prefabricated box culvert 1 is lifted by the lifting equipment; The culvert 1 is transported to the construction site; at the construction site, the prefabricated box culvert 1 needs to be turned over and installed, and the prefabricated box culvert 1 is hoisted and moved to the designated place by repeating S2 with the spreader; the second hydraulic cylinder 407 is driven to eject the stop rod 406, Then drive the fourth hydraulic cylinder 417 to drive the rotating arm 404 to rotate, so that the stop rod 406 is against the bottom of the prefabricated box culvert 1, thereby pushing up one end of the prefabricated box culvert 1, and driving the third hydraulic cylinder 408 to withdraw the latch 405 Lifting hole 101; slowly releasing the fourth hydraulic cylinder 417 can make the prefabricated box culvert 1 rotate around the pin 405 fixed in the lifting hole 101 by its own weight, so that the prefabricated box culvert 1 is turned 90°, and then placed by lifting equipment to the designated location.

The above-mentioned embodiments are only preferred technical solutions of the present invention, and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solution described in the claims, including the equivalent of technical features in the technical solutions described in the claims. The alternative is the scope of protection. That is, equivalent replacement and improvement within this range are also within the protection scope of the present invention.

Claims (10)

1. A prefabricated box girder flip telescopic spreader, characterized in that it includes a hanging beam (2), the two sides of the hanging beam (2) are provided with sliding arms (3) that slide relatively, and the end of the sliding arm (3) A sliding lifting and turning mechanism (4) is provided, and the two ends of the sliding seat (401) in the lifting and turning mechanism (4) are provided with bolts (405) that slide left and right, and the bolt (405) at one end also leans against the sliding seat (401 ) to slide forward and backward, the outer side of the sliding seat (401) is provided with a rotating rotating arm (404), and the end of the rotating arm (404) is provided with a stop rod (406) sliding forward and backward; The latch pin (405) is inserted into the lifting holes (101) on both sides of the prefabricated box culvert (1), and the stop bar (406) abuts against the bottom of the prefabricated box culvert (1). 2. According to claim 1, a prefabricated box girder flip telescopic spreader is characterized in that: the hanger beam (2) is composed of two I-beams (201), and the two sides of the I-beam (201) are fixed There are slide rails (203), on which slide rails (203) are provided with a plurality of slide blocks (202), the slide arm (3) is arranged between two I-beams (201), and the top of the slide arm (3) The fixing plate (301) is fixed on the slider (202). 3. According to claim 2, a prefabricated box girder flip telescopic spreader is characterized in that: the middle part of the I-beam (201) is fixed with a hoisting connection part (204), and one side of the I-beam (201) is fixed A motor (205) is provided, and a two-way screw rod (206) is arranged between the two I-beams (201). ) is connected to the two-way screw rod (206) through the driving structure, and the thread sleeve (302) in the sliding arm (3) is threadedly connected to the two-way screw rod (206); The motor (205) drives the two-way screw rod (206) to rotate through the drive structure, so that the sliding arms (3) on both sides move relatively. 4. According to claim 1, a prefabricated box girder flip telescopic spreader is characterized in that: the bottom of the sliding arm (3) is fixed with a first hinge seat (304), and the top is fixed with a fixed plate (301) , the sliding arm (3) is fixed with a threaded sleeve (302) inside, the first hinged seat (304) is provided with a hinged first hydraulic cylinder (305), and both sides of the first hinged seat (304) are fixed with guide sleeve (303). 5. A prefabricated box girder flipping telescopic spreader according to claim 1, characterized in that: the middle part of the sliding seat (401) in the hoisting turning mechanism (4) is fixed with a second hinged seat (403), the second There are guide columns (402) fixed on both sides of the second hinge seat (403), and the guide columns (402) slide against the guide sleeve (303). The end of the piston rod of the first hydraulic cylinder (305) is hinged on the second hinge inside the seat (403). 6. A prefabricated box girder flip telescopic spreader according to claim 5, characterized in that: the two ends of the sliding seat (401) are provided with through chute (411), and the chute (411) is provided with Sliding sleeve (412), latch (405) slides against sliding sleeve (412). 7. A prefabricated box girder flip telescopic spreader according to claim 6, characterized in that: one side of the chute (411) is provided with a plurality of threaded holes, and one side of the sliding sleeve (412) is provided with corresponding The through hole of the through hole is connected with the threaded hole through the fixing bolt (413), so as to fix the sliding sleeve (412); The sliding sleeve (412) at one end is provided with a threaded plug (414), and the plug (414) abuts and fixes the latch (405) in the sliding sleeve (412); The end of the sliding sleeve (412) at the other end is provided with a third hydraulic cylinder (408), and a connecting sleeve (415) is fixed between the third hydraulic cylinder (408) and the sliding sleeve (412). The third hydraulic cylinder (408 ) of the piston rod end is threaded on the pin (405). 8. A prefabricated box girder flip telescopic spreader according to claim 5, characterized in that: a rotating shaft (409) is provided in the middle of the sliding seat (401), and the end of the rotating arm (404) is sleeved on the shaft (409), the rotating shaft (409) rotates against the sliding seat (401) through the bearing, and the two ends of the rotating shaft (409) are fixed with baffles (410), and the baffles (410) are against the rotating arm (404) And on the bearing in the sliding seat (401). 9. A prefabricated box girder flip telescopic spreader according to claim 8, characterized in that: a hinge shaft (416) is fixed on one side of the end of the sliding seat (401), and there is a hinge shaft (416) on the hinge shaft (416). A hinged fourth hydraulic cylinder (417), the end of the piston rod of the fourth hydraulic cylinder (417) is hinged on the rotating arm (404); A second hydraulic cylinder (407) is fixed on one side of the end of the rotating arm (404), and the end of the piston rod of the second hydraulic cylinder (407) is threadedly connected to the blocking rod (406). 10. According to any one of claims 1 to 9, a method for using a prefabricated box girder flipping telescopic spreader, the method is as follows: S1. According to the size of the prefabricated box culvert (1), the drive motor (205) adjusts two The spacing between the hanging beams (2) on the side, and driving the first hydraulic cylinder (305) to adjust the spacing between the hoisting turning mechanism (4) and the hanging beams (2); S2. Use lifting equipment to move the spreader to the top of the prefabricated box culvert (1), and lower the spreader so that the pin (405) is aligned with the pre-buried lifting hole (101) on the prefabricated box culvert (1), and the drive motor (205 ) drives the lifting beam (2) to move relatively, so that the bolt (405) is inserted into the lifting hole (101), and the prefabricated box culvert (1) is lifted by the lifting device; S3. The prefabricated box culvert (1) is hoisted and transferred to the transportation equipment by the spreader, and then the prefabricated box culvert (1) is transported to the construction site; S4. At the construction site, the prefabricated box culvert (1) needs to be turned over and then installed, and the prefabricated box culvert (1) is hoisted and moved to the designated location by repeating S2 with the spreader; S5. Drive the second hydraulic cylinder (407) to eject the stop rod (406), and then drive the fourth hydraulic cylinder (417) to drive the rotating arm (404) to rotate, so that the stop rod (406) is against the prefabricated box culvert (1 ) bottom, thereby pushing up one end of the prefabricated box culvert (1), and driving the third hydraulic cylinder (408) to withdraw the pin (405) from the lifting hole (101); S6. Slowly releasing the fourth hydraulic cylinder (417) can make the prefabricated box culvert (1) rotate around the pin (405) fixed in the lifting hole (101) by its own weight, so that the prefabricated box culvert (1) can be rotated for 90 °Turn it over, and then place it to the designated place by lifting equipment.

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