Beam support adaptable to different spans and method of use thereof

Abstract

This invention provides a crossbeam support system adaptable to different spans and its usage method. The system includes a truss with prefabricated brackets at both ends of the truss. Each prefabricated bracket includes an embedded device and an external support device. The embedded device is pre-embedded in the cable tower, and the external support device supports the truss. The truss comprises two single trusses, with an adjustable frame between them. For the construction of multiple crossbeams on ultra-high cable towers, only one set of trusses needs to be fabricated. The frame can be adjusted by telescopic means to adapt to the construction needs of crossbeams with different spans, reducing the overall steel consumption of the support system. The truss of this invention can be assembled at the base of the tower and hoisted onto the tower as a whole using lifting equipment, reducing high-altitude splicing and welding operations. This invention also enables truss width adjustment, avoiding the phenomenon where suspension bridges typically narrow from top to bottom, which can affect truss hoisting. This makes it suitable for widespread use.

Description

Technical Field

[0001] This invention relates to the field of bridge pylon construction, and in particular to a crossbeam support adapted to different spans and its usage method. Background Technology

[0002] Suspension bridges typically have twin-tower portal frame structures, and these towers are classified as steel towers or concrete towers based on the materials used. A crossbeam is usually installed between the two tower legs, including a lower crossbeam supporting the main girder and an upper crossbeam connecting the top of the tower. When the tower is tall, a transition crossbeam is also installed between the upper and lower crossbeams. The lower crossbeam is usually only slightly above the ground and can be constructed using ground-supported scaffolding, while the upper crossbeam or other taller transition crossbeams are often constructed using corbel scaffolding.

[0003] When installing and dismantling high-altitude crossbeam supports, traditional supports requiring high-altitude welding, lap joints, and bolt connections are cumbersome to install and dismantle, involving numerous welding and bolting processes, resulting in high operating and labor costs. Due to limited working space, suspension bridges typically narrow from top to bottom, making it difficult to hoist the truss supports to the ground after installation. This necessitates using hand-operated hoists to drag the truss supports along the beam plane of the suspension bridge, which is difficult to operate and can easily damage the suspension bridge structure, wasting time and effort. Therefore, we propose a crossbeam support system adaptable to different spans and its usage method to solve the above problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a crossbeam support that can adapt to different spans and its usage method, so as to solve the problem that when installing and dismantling crossbeam supports at high altitudes, the traditional supports that require high-altitude welding, overlapping and bolting are relatively cumbersome to install and dismantle, require a lot of welding and bolting processes, and have high usage and labor costs.

[0005] Another technical problem to be solved by the present invention is to provide a crossbeam support that can adapt to different spans and its usage method, so as to solve the problem that since suspension bridges generally narrow from top to bottom, after the truss support is used, it is necessary to use a hand hoist to drag the truss support along the beam plane on the suspension bridge. This is difficult to operate, and dragging can easily affect the suspension bridge structure, which is time-consuming and labor-intensive.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a crossbeam support adapted to different spans and its usage method, including a truss, with prefabricated brackets at the bottom of both ends of the truss, the prefabricated brackets including a pre-embedded device and an external support device, the pre-embedded device being pre-embedded on the cable tower, the external support device supporting the truss, the truss including two single trusses, and an adjustment frame between the two single trusses.

[0007] In the preferred embodiment, the pre-embedded device includes a pad plate, on which multiple pre-embedded steel boxes are provided, between two adjacent pre-embedded steel boxes, multiple stiffening plates are provided, multiple anchor bars are provided on the pre-embedded steel boxes, and multiple through holes are provided on the pad plate.

[0008] In the preferred embodiment, the external support device has two exposed flange plates, and one side of each exposed flange plate has multiple insert flange plates that are inserted into the pre-embedded steel box.

[0009] In the preferred embodiment, the insert flange is provided with a flange plate and a belly plate, and multiple ribs are provided between the two exposed flange plates.

[0010] In the preferred embodiment, the adjusting frame includes two outer frames, with sliding plates at both ends of the outer frames. Multiple rectangular steel plates are provided on the sliding plates, and driving devices are provided on the two outer frames. A lifting device is provided at the bottom of the sliding plates.

[0011] In the preferred embodiment, the two outer frames are connected by multiple diagonal braces, a first hydraulic cylinder is provided on the rectangular steel, and multiple lifting lugs are provided on both sides of the top outer frame.

[0012] In the preferred embodiment, the drive device includes a bidirectional lead screw and a motor mounted on the outer frame. The bidirectional lead screw is rotatably connected to the outer frame. The output end of the motor is provided with a main gear, and the bidirectional lead screw is provided with a driven gear, which meshes with the main gear.

[0013] In the preferred embodiment, the lifting device includes a second hydraulic cylinder, which is mounted on the slide plate. One end of the second hydraulic cylinder is provided with a bearing, which is connected to a two-way lead screw.

[0014] In the preferred embodiment, the single truss is provided with multiple hollow connecting steels, and the connecting steels are provided with multiple positioning holes. Rectangular steels abut against the connecting steels of the single truss. One section of the first hydraulic cylinder abuts against the positioning hole. The single truss is provided with multiple second lifting lugs. The tower is equipped with a main crossbeam, the bottom of which rests against the exposed flange plate at the top. Multiple unloading blocks are installed on the main crossbeam, and a single truss rests against multiple unloading blocks.

[0015] A method for using a crossbeam support that adapts to different spans is as follows: S1. When the cable tower is being reinforced, the external support device and the embedded device are spliced ​​together, the position of the prefabricated corbel is reserved, the embedded device is installed on the cable tower reinforcement, and the leveling is achieved by using a shim plate and fixing it to the cable tower. S2. Seal the gap between the pre-embedded steel box opening and the template by inserting bamboo plywood. After the cable tower is poured, remove the bamboo plywood from the pre-embedded steel box opening. S3. Hoist the external support device into the pre-embedded steel box after the pre-embedded device, hoist the main crossbeam onto the prefabricated bracket, fix the main crossbeam and the prefabricated bracket, and install multiple unloading blocks on the main crossbeam. S4. When the two single trusses are aligned, the drive motor drives the second hydraulic cylinder to extend the rectangular steel on both sides. When the rectangular steel abuts against the reserved positioning hole on the single truss and aligns, the first hydraulic cylinder is driven to make the truss adapt to the width of the cable tower. S5. Hoist the truss above the main beam and place the truss on the unloading block; S6. After the crossbeam construction is completed, the crane lifts the truss and simultaneously cuts the unloading blocks, so that the bottom of the truss is detached. The crane lowers one end of the truss onto the main crossbeam, while the other end remains suspended. The second hydraulic cylinder is driven to connect the bearing bush with the double-ended screw, so that the suspended end of the truss moves closer to the adjusting frame. S7. Similarly, the crane lifts the truss to another main crossbeam on the tower, while another single truss is suspended in the air. This causes the single truss to move closer to the adjusting frame, and the width of the truss after shrinking becomes smaller, allowing the truss to be safely lowered to the ground. S8. Retract the first hydraulic cylinder to disengage the adjusting frame from the two single trusses. The trusses are then disassembled. The main crossbeam and the prefabricated bracket are then hoisted to the ground in sequence. Finally, the embedded device is grouted and sealed.

[0016] This invention provides a crossbeam support adapted to different spans and its usage method. When the lower crossbeam usually has a large height difference with the ground, a truss can be used for construction, avoiding the need for high-altitude welding, overlapping and bolting of the support directly on the cable tower. This avoids the cumbersome steps of installation and dismantling, and also avoids a large number of welding and bolting processes required on the cable tower, thereby reducing the cost of building the cable tower.

[0017] For the construction of multiple crossbeams on ultra-high cable towers in bridge engineering, this invention allows for the fabrication of only one truss. The truss structure can be adjusted via telescopic movement to accommodate crossbeams of varying spans, reducing the overall steel consumption of the support system. The truss of this invention can be assembled at the base of the tower and then hoisted onto the tower as a whole using lifting equipment, minimizing high-altitude splicing and welding operations. This invention features good versatility, minimal high-altitude work, and a high degree of prefabrication, reducing the overall cost of the support system and the risks associated with high-altitude operations.

[0018] The drive mechanism and adjusting frame structure of this invention enable a single motor to drive two sliding plates, thereby controlling the movement of multiple rectangular steel sections and saving energy. The lifting device on the sliding plates and the driving mechanism allow adjustment of whether the sliding plates slide on the outer frame. The adjusting frame allows the sliding plates at both ends or only one side to slide, ensuring that during truss hoisting, one end of the truss rests against the main crossbeam while the other end is suspended, thus achieving truss width adjustment. This avoids the phenomenon where suspension bridges typically narrow from top to bottom, hindering truss hoisting, and eliminates the need for manual hoists to drag the truss along the beam plane of the towers, which could negatively impact the suspension bridge structure. This design is suitable for widespread use. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a front view of the overall structure of the present invention; Figure 2 This is a side view of the overall device of the present invention; Figure 3 This is an axonometric view of the assembled bracket of the present invention; Figure 4 This is an axonometric view of the external support device of the present invention; Figure 5 This is an axonometric view of the pre-embedded device of the present invention; Figure 6 This is a partial front view of the truss structure of the present invention; Figure 7 This is a top view of the adjustment frame of the present invention; Figure 8 This is a front view of the skateboard of the present invention; Figure 9 This is a front view of the driving device of the present invention; In the diagram: 1. Prefabricated bracket; 2. External support device; 201. Rib plate; 202. Exposed flange plate; 203. Inserted flange plate; 204. Flange plate; 205. Embedded device; 3. Embedded steel box; 301. Stiffening plate; 302. Through hole; 303. Pad plate; 304. Anchor bar; 305. Truss; 4. Single truss; 401. Positioning hole; 402. Second lifting lug; 403. Adjustable frame; 5. Outer frame; 501. Diagonal brace; 502. Slide plate; 503. Rectangular steel; 504. First hydraulic cylinder; 505. Lifting lug; 506. Pad box; 6. Cable tower; 7. Main crossbeam; 701. Unloading block; 8. Drive device; 9. Motor; 901. Main gear; 902. Driven gear; 903. Two-way lead screw; 904. Lifting device; 10. Second hydraulic cylinder; 1001. Bearing; 1002. Detailed Implementation

[0020] Example 1: like Figures 1-9 The present invention discloses a crossbeam support system adaptable to different spans and its usage method, comprising a truss 4, with prefabricated brackets 1 at both ends of the truss 4. Each prefabricated bracket 1 includes a pre-embedded device 3 and an external support device 2. The pre-embedded device 3 is pre-embedded in the cable tower 7, and the external support device 2 supports the truss 4. The truss 4 includes two single trusses 401, with an adjustment frame 5 between the two single trusses 401. With this structure, when the lower crossbeam has a significant height difference from the ground, the truss 4 can be used for construction, avoiding direct high-altitude welding, overlapping, and bolting on the cable tower 7. This avoids the cumbersome steps of installation and dismantling, and also reduces the need for numerous welding and bolting processes on the cable tower 7, thereby lowering the construction cost of the cable tower 7.

[0021] For the construction of multiple crossbeams on ultra-high cable towers in bridge engineering, only one set of truss 4 needs to be fabricated. The telescopic frame 5 can be adjusted to accommodate the construction needs of crossbeams with different spans, reducing the overall steel consumption of the support structure. The truss 4 of this invention can be assembled at the base of the tower and hoisted onto the tower as a whole using lifting equipment, reducing high-altitude splicing and welding operations. This invention features good versatility, minimal high-altitude work, and a high degree of prefabrication, reducing the overall cost of the support structure and the risks associated with high-altitude operations.

[0022] The structure of the drive device 9 and the adjusting frame 5 of the present invention enables a single motor 901 to drive two sliding plates 503, thereby controlling the movement of multiple rectangular steel sections 504 and saving energy. The lifting device 10 on the sliding plates 503 and the operating drive device 9 adjust whether the sliding plates 503 slide on the outer frame 501. The adjusting frame 5 allows the sliding plates 503 at both ends to slide, or only one side of the sliding plates 503 to slide, so that during the hoisting of the truss 4, one end of the truss 4 can rest against the main crossbeam 701 while the other end is suspended, thus achieving width adjustment of the truss 4. This avoids the phenomenon that suspension bridges generally narrow from top to bottom, which could affect the hoisting of the truss 4, and also avoids the use of hand-operated hoists to drag the truss 4 along the beam plane on the tower 7, thus preventing any impact on the suspension bridge structure.

[0023] In the preferred embodiment, the embedded device 3 includes a base plate 304, on which multiple embedded steel boxes 301 are provided. Multiple stiffening plates 302 are provided between adjacent embedded steel boxes 301. Multiple anchor bars 305 are provided on the embedded steel boxes 301, and multiple through holes 303 are provided on the base plate 304. With this structure, the embedded steel boxes 301 have multiple slots, connected by stiffening plates 302. The stiffening plates 302 are arranged vertically, reducing conflict with the vertical main reinforcement of the tower 7. This avoids the need to drill holes for the main reinforcement in the stiffening plates 302, and also facilitates the passage of concrete vibrating devices through the gaps between the stiffening plates 302, thereby vibrating the concrete below and between the embedded steel boxes 301. The bottom of the embedded steel box 301 is provided with a pad 304, which can facilitate the leveling and fixing of the embedded steel box 301. A through hole 303 is opened in the middle of the pad 304. The embedded steel box 301 is provided with a main reinforcement reserved hole at the place where it interferes with the main reinforcement.

[0024] In the preferred embodiment, the external support device 2 has two slotted exposed flange plates 202, and one side of the two slotted exposed flange plates 202 is provided with multiple inserted flange plates 203, which are inserted into the pre-embedded steel box 301.

[0025] In the preferred embodiment, the inserted flange plate 203 is provided with a flange plate 204 and a belly plate 205, and multiple ribs 201 are provided between the two exposed flange plates 202. With this structure, the exposed flange plates 202 and ribs 201 are welded to form the exposed part of the prefabricated bracket 1, and the inserted flange plate 203 is welded to one side of the ribs 201, which increases the stress-bearing area between the prefabricated bracket 1 and the embedded steel box 301. The embedded steel boxes 301 are connected by stiffening plates 302, and are fixed by pads 304 on the bottom side. A ring of anchor bars 305 is provided around the embedded steel boxes 301 to enhance the anchoring capacity.

[0026] The size of the embedded steel box 301 is slightly larger than the insertion part of the insert flange plate 203. A belly plate 205 is set in the middle of the insert flange plate 203 to fit with the embedded steel box 301. A flange plate 204 is set at the top of the insert flange plate 203 to enhance the load-bearing capacity of the end of the socket-type bracket.

[0027] In the preferred embodiment, the adjusting frame 5 includes two outer frames 501, with sliding plates 503 at both ends of the outer frames 501. Multiple rectangular steel bars 504 are mounted on the sliding plates 503. A drive device 9 is mounted on each of the two outer frames 501, and a lifting device 10 is located at the bottom of each sliding plate 503. This structure, along with the drive device 9 and the adjusting frame 5, allows the two sliding plates 503 to move via a single motor 901, thereby controlling the movement of the multiple rectangular steel bars 504 and saving energy. The lifting device 10 on the sliding plates 503 and the operating drive device 9 adjust whether the sliding plates 503 slide on the outer frames 501. The adjusting frame 5 allows the sliding plates 503 at both ends to slide or only one side of the sliding plate 503 to slide, so that during the hoisting of the truss 4, one end of the truss 4 can rest against the main crossbeam 701 while the other end is suspended, thus achieving width adjustment of the truss 4.

[0028] In the preferred embodiment, the two outer frames 501 are connected by multiple diagonal braces 502, a first hydraulic cylinder 505 is provided on the rectangular steel 504, and multiple lifting lugs 506 are provided on both sides of the top outer frame 501. With this structure, when the rectangular steel 504 abuts against the reserved positioning hole 402 on the single truss 401 and aligns, the first hydraulic cylinder 505 is driven to make the truss 4 adapt to the width of the cable tower 7.

[0029] In the preferred embodiment, the drive device 9 includes a bidirectional lead screw 904 and a motor 901 mounted on the outer frame 501. The bidirectional lead screw 904 is rotatably connected to the outer frame 501. The output end of the motor 901 is provided with a main gear 902, and the bidirectional lead screw 904 is provided with a driven gear 903, which meshes with the main gear 902. With this structure, the motor 901 is driven to rotate the main gear 902, which in turn rotates the driven gear 903, causing the bidirectional lead screw 904 to rotate. When the second hydraulic cylinder 1001 of the lifting device 10 extends, the bidirectional lead screw 904 meshes with the bearing bush 1002, causing the slide plate 503 to slide and the rectangular steel 504 to extend, thereby adjusting the length of the adjusting frame 5 and the length of the truss 4.

[0030] In the preferred embodiment, the lifting device 10 includes a second hydraulic cylinder 1001, which is mounted on the slide plate 503. One end of the second hydraulic cylinder 1001 is provided with a bearing 1002, which is connected to a double-acting screw 904. With this structure, when the second hydraulic cylinder 1001 of the lifting device 10 extends, the double-acting screw 904 engages with the bearing 1002, causing the slide plate 503 to slide and the rectangular steel 504 to extend, thereby adjusting the length of the adjusting frame 5. When it is necessary for one side of the truss 4 to extend or retract while the other side remains unchanged, one side of the lifting device 10 retracts, and the other side extends, so that when the drive device 9 is activated, the rectangular steel 504 on one side of the adjusting frame 5 extends or retracts.

[0031] In the preferred embodiment, the single truss 401 is provided with multiple hollow connecting steels, and the connecting steels are provided with multiple positioning holes 402. The rectangular steel 504 abuts against the connecting steel of the single truss 401. One section of the first hydraulic cylinder 505 abuts against the positioning hole 402. The single truss 401 is provided with multiple second lifting lugs 403. The tower 7 is equipped with a main crossbeam 701, the bottom of which abuts against the exposed flange plate 202 at the top. Multiple unloading blocks 8 are mounted on the main crossbeam 701, and a single truss 401 abuts against these unloading blocks 8. Due to this structure, the single truss 401 has chamfers to accommodate changes in the crossbeam cross-section at the tower-beam intersection. A pad box 6 is used to fill the chamfered ends of the single truss 401.

[0032] The unloading block 8 columns are spliced ​​from 3 HM588×300 steel sections. The bottom and top of the columns are made of 20mm thick steel plates as pads, and the web is made of 20mm thick steel plates as stiffening plates. The unloading of the support is achieved by cutting the steel columns.

[0033] Example 2: Further explanation based on Example 1: A crossbeam support adapted to different spans and its usage method includes the following steps: when the steel of the cable tower 7 is being reinforced, splicing the external support device 2 and the pre-embedded device 3, reserving the position of the prefabricated bracket 1, installing the pre-embedded device 3 on the cable tower reinforcement, and using the pad 304 for leveling and fixing it to the cable tower 7. Bamboo plywood was used to seal the opening between the pre-embedded steel box 301 and the template. After the cable tower 7 was poured, the bamboo plywood at the opening of the pre-embedded steel box 301 was removed. After the external support device 2 is hoisted into the embedded steel box 301 of the embedded device 3, the main crossbeam 701 is hoisted onto the prefabricated bracket 1, the main crossbeam 701 and the prefabricated bracket 1 are fixed, and multiple unloading blocks 8 are installed on the main crossbeam 701. Two single trusses 401 are aligned, and the drive motor 901 drives the second hydraulic cylinder 1001 to extend the rectangular steel 504 on both sides. When the rectangular steel 504 abuts against the reserved positioning hole 402 on the single truss 401 and aligns, the first hydraulic cylinder 505 is driven to make the truss 4 adapt to the width of the cable tower 7. Hoist the truss 4 above the main beam 701 and place the truss 4 on the unloading block 8; After the crossbeam construction is completed, the crane lifts the truss 4 and simultaneously cuts the unloading block 8, so that the bottom of the truss 4 is detached. The crane lowers one end of the truss 4 onto the main crossbeam 701, while the other end remains suspended. The second hydraulic cylinder 1001 is then driven to connect the bearing 1002 with the double-acting screw 904, causing the suspended end of the truss 4, the single truss 401, to move closer to the adjusting frame 5. Similarly, the crane lifts the truss 4 to another main beam 701 on the tower 7, and another single truss 401 is suspended in the air. This also causes the single truss 401 to move closer to the adjusting frame 5. The width of the truss 4 after shrinking becomes smaller, and the truss 4 is safely lowered to the ground. The first hydraulic cylinder 505 is retracted to disengage the adjusting frame 5 from the two single trusses 401. The trusses 4 are disassembled, and then the main crossbeam 701 and the prefabricated bracket 1 are hoisted to the ground in sequence. Finally, the pre-embedded device 3 is grouted and sealed.

[0034] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The embodiments and features described in these embodiments can be arbitrarily combined without conflict. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A beam support suitable for different spans, characterized by: The truss (4) is provided with prefabricated brackets (1) at both ends of the truss (4). The prefabricated brackets (1) include a pre-embedded device (3) and an external support device (2). The pre-embedded device (3) is pre-embedded on the cable tower (7), and the external support device (2) supports the truss (4). The truss (4) includes two single trusses (401), and an adjustment frame (5) is provided between the two single trusses (401). The external support device (2) includes two slotted exposed flange plates (202), and multiple insert flange plates (203) are provided on one side of the two slotted exposed flange plates (202). The insert flange plates (203) are inserted into the pre-embedded steel box (301). The pre-embedded device (3) includes a pad (304) and multiple pre-embedded steel boxes (301) are provided on the pad (304); The adjusting frame (5) includes two outer frames (501), with sliding slide plates (503) at both ends of the outer frames (501), multiple rectangular steel plates (504) on the slide plates (503), a driving device (9) on the two outer frames (501), and a lifting device (10) at the bottom of the slide plates (503). The tower (7) is provided with a main crossbeam (701), the bottom of the main crossbeam (701) abuts against the top exposed flange plate (202), and the main crossbeam (701) is provided with multiple unloading blocks (8), and the single truss (401) abuts against multiple unloading blocks (8); The two outer frames (501) are connected by multiple diagonal braces (502), and the first hydraulic cylinder (505) is provided on the rectangular steel (504). Multiple lifting lugs (506) are provided on both sides of the top outer frame (501). The drive device (9) includes a two-way lead screw (904) and a motor (901) mounted on the outer frame (501). The two-way lead screw (904) is rotatably connected to the outer frame (501). The output end of the motor (901) is provided with a main gear (902). The two-way lead screw (904) is provided with a driven gear (903). The driven gear (903) meshes with the main gear (902). The lifting device (10) includes a second hydraulic cylinder (1001), which is mounted on a sliding plate (503). One end of the second hydraulic cylinder (1001) is provided with a bearing (1002), which selectively engages with a two-way lead screw (904). The single truss (401) is provided with multiple hollow connecting steels, and the connecting steels are provided with multiple positioning holes (402). The rectangular steel (504) abuts against the connecting steel of the single truss (401). One end of the first hydraulic cylinder (505) abuts against the positioning hole (402). The single truss (401) is provided with multiple second lifting lugs (403).

2. The beam support of claim 1, wherein: Multiple stiffening plates (302) are provided between two adjacent embedded steel boxes (301), multiple anchor bars (305) are provided on the embedded steel box (301), and multiple through holes (303) are provided on the pad plate (304).

3. The beam support of claim 1, wherein the insert is adapted to accommodate different spans. The flange plate (203) is provided with a flange plate (204) and a belly plate (205), and multiple ribs (201) are provided between the two exposed flange plates (202).

4. The method of using a crossbeam support adapted to different spans according to any one of claims 1 to 3 is as follows: S1. When the steel is tied in the tower (7), the external support device (2) and the pre-embedded device (3) are spliced ​​together, the position of the prefabricated bracket (1) is reserved, the pre-embedded device (3) is installed on the steel reinforcement of the tower, and the leveling is performed by using the pad (304) and fixed to the tower (7); S2. Seal the gap between the opening of the pre-embedded steel box (301) and the template by inserting bamboo plywood. After pouring the cable tower (7), remove the bamboo plywood from the opening of the pre-embedded steel box (301). S3. The external support device (2) is hoisted into the embedded steel box (301) after the embedded device (3). The main crossbeam (701) is hoisted onto the prefabricated bracket (1). The main crossbeam (701) and the prefabricated bracket (1) are fixed. Multiple unloading blocks (8) are installed on the main crossbeam (701). S4. The two single trusses (401) are aligned, and the drive motor (901) drives the second hydraulic cylinder (1001) to extend the rectangular steel (504) on both sides. When the rectangular steel (504) abuts against the reserved positioning hole (402) on the single truss (401) and is aligned, the first hydraulic cylinder (505) is driven to make the truss (4) adapt to the width of the cable tower (7). S5. Hoist the truss (4) above the main beam (701) and place the truss (4) on the unloading block (8); S6. After the crossbeam construction is completed, the crane lifts the truss (4) and simultaneously cuts the unloading block (8), so that the bottom of the truss (4) is detached. The crane lifts one end of the truss (4) onto the main crossbeam (701), while the other end is suspended in the air. The second hydraulic cylinder (1001) is driven to connect the bearing (1002) with the double-acting screw (904), so that the single truss (401) at the suspended end of the truss (4) moves closer to the adjusting frame (5). S7. Similarly, the crane lifts the truss (4) to another main beam (701) on the tower (7), and another single truss (401) is suspended in the air. This also causes the single truss (401) to move closer to the adjusting frame (5). The width of the truss (4) after shrinking becomes smaller, and the truss (4) is safely lifted to the ground. S8. Shrink the first hydraulic cylinder (505) so that the adjusting frame (5) is separated from the two single trusses (401), the truss (4) is disassembled, and then the main crossbeam (701) and the prefabricated bracket (1) are hoisted to the ground in sequence. Finally, the pre-embedded device (3) is grouted and sealed.

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