A Z-shaped capping beam and a segmented construction method for hoisting with low clearance across the existing ramp

Abstract

The present invention discloses a Z-shaped capping beam and a segmented construction method for hoisting it across an existing ramp with a low clearance. The Z-shaped capping beam includes a first beam segment located directly below the beam bottom of the highway and a second beam segment located directly above the highway ramp of the approach bridge. One end of the first beam segment and the second beam segment close to each other are connected to each other. The construction method includes building bridge piers on both sides of the ground road and erecting a temporary support between the two bridge piers; hoisting the first beam segment to a position directly below the beam bottom of the highway; hoisting the second beam segment to a position directly above the highway ramp of the approach bridge, so that one end of the second beam segment is placed on the first beam segment and the other end is placed on another bridge pier; welding the first beam segment and the second beam segment; removing the temporary support; and laying the highway ramp on the second beam segment. The present application has the effects that the steel capping beam construction can be carried out in a relatively narrow space, and after the erection of the steel capping beam is completed, the clearance requirements of the existing highway ramp of the approach bridge can be met.

Description

Technical Field

[0001] The present invention relates to the field of overpass construction, and particularly to a Z-shaped capping beam and a low-clearance hoisting and segmented construction method for crossing an existing ramp. Background Art

[0002] At present, with the continuous development of society, in order to improve the traffic smoothness of the city, overpasses are built on the basis of the original roads. And when it is necessary to build a highway subsequently, construction will be carried out directly above the original overpass in an overpass manner.

[0003] However, as Figure 1 shown, the horizontal height of the highway 101 is higher than that of the highway approach ramp 102. And the highway 101 and the highway approach ramp 102 are located on both sides respectively. The bottoms on both sides of the highway 101 are hollowed out and the top surface is an inclined surface, which slopes downward from the side of the highway 101 towards the cross beam of the highway 101. When it is necessary to construct a ramp for getting off the highway at the position corresponding to the original highway approach ramp 102 of the highway 101, a steel capping beam needs to be erected at the position between the original highway approach ramp 102 and the highway 101. However, when erecting the steel capping beam, not only construction needs to be carried out in a narrow space, but also after the erection of the steel capping beam, the clearance requirements of the original highway approach ramp 102 need to be met. However, the existing steel capping beam structure cannot meet the above construction requirements, nor is there a construction method suitable for the above construction environment. Summary of the Invention

[0004] In order to construct a steel capping beam in a narrow space and meet the clearance requirements of the original highway approach ramp after the erection of the steel capping beam, the present application provides a Z-shaped capping beam and a low-clearance hoisting and segmented construction method for crossing an existing ramp.

[0005] In a first aspect, a Z-shaped capping beam provided by the present application adopts the following technical solution:

[0006] A Z-shaped capping beam, characterized in that it includes a first beam segment located directly below the beam bottom of the highway and a second beam segment located directly above the highway approach ramp. The horizontal height of the first beam segment is lower than that of the second beam segment. One end of the first beam segment and the second beam segment close to each other are connected to each other, and the connection between the first beam segment and the second beam segment is arranged out of alignment with the highway approach ramp in the horizontal direction.

[0007] By adopting the above technical solution, since the highway is arranged directly above the surface road and the highway ramp is arranged on one side of the highway, if a capping beam needs to be erected at the position between the highway and the highway ramp, the capping beam needs to straddle both the surface road and the highway ramp. However, during the erection process of the capping beam, the clearance requirements of the original highway ramp need to be met. Therefore, the capping beam is divided into a first beam segment and a second beam segment. The first beam segment is located directly below the beam bottom of the highway, and the second beam segment is located directly above the highway ramp. Since the horizontal height of the first beam segment is lower than that of the second beam segment, it forms a Z shape to meet the clearance requirements of the original highway ramp after the erection of the steel capping beam is completed.

[0008] Preferably, the cross-sections of the first beam segment and the second beam segment are box-shaped.

[0009] By adopting the above technical solution, designing the first beam segment and the second beam segment into a box shape can reduce the weight and facilitate hoisting.

[0010] In a second aspect, the present application provides a construction method for segmental hoisting of a Z-shaped capping beam across an existing ramp with a low clearance, adopting the following technical solution:

[0011] A construction method for segmental hoisting of a Z-shaped capping beam across an existing ramp with a low clearance, based on the Z-shaped capping beam, the construction method includes:

[0012] Step 1: Build piers on both sides of the ground road. One pier is located directly below the beam bottom of the highway and on one side of the highway ramp, and the other pier is located on the other side of the highway ramp. Then, set up a temporary support between the two piers.

[0013] Step 2: Hoist the first beam segment to the position directly below the beam bottom of the highway through a knuckle boom crane, so that both ends of the first beam segment are respectively placed on one pier and the temporary support. The end of the first beam segment located on the temporary support is directly below the bottom hollow position on one side of the highway.

[0014] Step 3: Hoist the second beam segment to the position directly above the highway ramp through a truck crane, so that one end of the second beam segment is placed on the end of the first beam segment located on the temporary support, and the other end of the second beam segment is placed on the other pier.

[0015] Step 4: Weld the overlapping positions of the first beam segment and the second beam segment.

[0016] Step 5: Remove the temporary support.

[0017] Step 6: Lay the highway ramp on the second beam segment.

[0018] By adopting the above technical solution, a temporary support is erected to temporarily support the connection position between the first beam segment and the second beam segment; since the first beam segment is at the bottom position of the highway and the hoisting space is small, the first beam segment is hoisted to the position directly below the beam bottom of the highway by means of a folding boom crane, and both ends of the first beam segment are respectively placed on the pier and the temporary support; since the second beam segment is directly above the highway ramp of the approach bridge and there is no road directly above the highway ramp of the approach bridge, the second beam segment can be directly hoisted to the position directly above the highway ramp of the approach bridge by means of a truck crane, and both ends of the second beam segment are respectively placed on the first beam segment and the pier; the appropriate hoisting method is adopted according to different environments to complete the hoisting of the precast components, with high hoisting efficiency and high safety.

[0019] Then the first beam segment and the second beam segment are welded to complete the construction of the capping beam; finally, the highway ramp is laid on the second beam segment; thus, the construction of the steel capping beam can be completed in a narrow space, and after the erection of the steel capping beam, the clearance requirements of the original highway ramp of the approach bridge can be met.

[0020] Preferably, between step one and step two, the construction method further includes:

[0021] A buffer sticker is laid at the bottom position of the beam of the highway, and a steel plate is fixed on the side of the buffer sticker away from the highway.

[0022] By adopting the above technical solution, since the space between the first beam segment and the highway is very narrow after the first beam segment is hoisted, when the first beam segment is hoisted to the bottom of the highway, it is easy to collide between the first beam segment and the bottom of the highway, and the weight of the first beam segment is in tons. Therefore, through the action of laying the buffer sticker and the steel plate, the highway is protected.

[0023] Preferably, in step three, after the second beam segment is hoisted to the position directly above the highway ramp of the approach bridge by the truck crane and before one end of the second beam segment is placed on one end of the first beam segment located at the temporary support and the other end of the second beam segment is placed on another pier, the construction method further includes:

[0024] The second beam segment is hoisted to be horizontally misaligned with the first beam segment, and one end of the second beam segment close to the first beam segment is clamped into the bottom hollow position on one side of the highway through a guiding mechanism, so as to keep a gap between the first beam segment and the second beam segment in the vertical direction;

[0025] The second beam segment is horizontally moved to directly above the first beam segment through the guiding mechanism, and the first beam segment is lowered so that one end of the second beam segment is placed on the first beam segment.

[0026] By adopting the above technical solution, since it is necessary to ensure the clearance of the high-speed approach ramp, the connection between the first beam segment and the second beam segment is located within the bottom hollow position on one side of the highway; and when hoisting the second beam segment, the first beam segment is only erected on the bridge pier and the temporary support; therefore, the hoisting of the second beam segment is also carried out in a narrow space and cannot collide with the first beam segment; thus, during the hoisting process of the second beam segment, the second beam segment is first hoisted to be horizontally misaligned with the first beam segment, and the second beam segment is clamped into the bottom hollow position on one side of the highway through the guiding mechanism; then, the second beam segment is horizontally guided by the guiding mechanism to move directly above the first beam segment, and then the second beam segment is lowered to complete the erection of the second beam segment on the first beam segment. This construction process can reduce the collision between the second beam segment and the first beam segment and improve the construction safety.

[0027] Preferably, the guiding mechanism includes: a mounting cylinder, a telescopic rod, an elastic member and a guiding wheel. The mounting cylinder is preset on the end face of the second beam segment close to the first beam segment, and the mounting cylinder extends obliquely upward from the second beam segment; the telescopic rod is slidably mounted in the mounting cylinder, and the guiding wheel is mounted at one end of the telescopic rod outside the mounting cylinder; the elastic member is mounted in the mounting cylinder, with one end connected to the inside of the mounting cylinder and the other end connected to the telescopic rod.

[0028] The method of clamping one end of the second beam segment close to the first beam segment into the bottom hollow position on one side of the highway through the guiding mechanism includes:

[0029] When the second beam segment is hoisted to be horizontally misaligned with the first beam segment, the guiding wheel abuts against the side of the highway.

[0030] Move the second beam segment into the bottom hollow position on one side of the highway.

[0031] By adopting the above technical solution, when the second beam segment is hoisted to be horizontally misaligned with the first beam segment, the guiding wheel abuts against the side of the highway. Thus, during the process of moving the second beam segment into the bottom hollow position on one side of the highway, if a steep deviation occurs, the elastic member can play a buffering role to reduce the direct collision between the second beam segment and the highway and improve the construction safety.

[0032] Preferably, the guiding mechanism further includes: a mounting plate, a mounting block and a torsion spring. The mounting plate extends in the width direction of the second beam section, and the mounting plate is detachably preset on the end face of the second beam section close to the first beam section; the mounting block is rotatably mounted on the mounting plate, and the rotating shaft of the mounting block extends horizontally in a direction perpendicular to the mounting plate; the mounting cylinder is hinged to the mounting block, and the rotating shaft of the mounting cylinder extends horizontally in a direction perpendicular to the rotating shaft of the mounting block; the rotating shafts of the mounting block and the mounting cylinder are both sleeved with the torsion spring. When the guiding wheel is in a natural state, the arc surface of the guiding wheel abuts against the top position of the bottom hollow on one side of the highway; the guiding mechanism further includes: a driving component for synchronously driving the mounting block and the mounting cylinder to rotate;

[0033] The method of horizontally moving the second beam section to directly above the first beam section through the guiding mechanism includes:

[0034] After the second beam section is completely moved into the bottom hollow position on one side of the highway, start the driving component to drive the guiding wheel to swing to abut against the end position inside the bottom hollow position on one side of the highway, and the guiding wheel rotates to a horizontal state.

[0035] By adopting the above technical solution, after the second beam section is completely moved into the bottom hollow position on one side of the highway, the driving component synchronously drives the mounting block and the mounting cylinder to rotate, so that the guiding wheel abuts against the end position inside the bottom hollow position on one side of the highway, and the guiding wheel rotates to a horizontal state, thereby achieving guiding during the horizontal movement of the second beam section towards directly above the first beam section, improving the hoisting accuracy and movement smoothness of the second beam section; in addition, since the connection between the mounting plate and the second beam section is detachable, after hoisting one second beam section is completed, removing one mounting plate can complete the disassembly of the entire guiding mechanism and be repeatedly applied to the hoisting of the next second beam section, which not only has high construction efficiency but also can reduce costs.

[0036] Preferably, the driving component includes: an assembly plate, a pulling rope and a winding shaft. The assembly plate is mounted on the mounting plate, and the assembly plate is on one side of the end face of the second beam section. The winding shaft is rotatably mounted on the assembly plate, and the horizontal height of the winding shaft is lower than the horizontal height of the mounting cylinder; one end of the pulling rope is mounted on the side of the mounting cylinder away from the winding shaft, and the other end is wound on the winding shaft; the driving component further includes: a driving member for driving the winding shaft to rotate;

[0037] The method of driving the guiding wheel to swing to abut against the end position inside the bottom hollow position on one side of the highway, and the guiding wheel rotates to a horizontal state includes:

[0038] Start the driving member to drive the winding shaft to rotate, so that the pulling rope is wound until the guiding wheel is pulled to swing to the end position within the bottom hollow position on one side of the highway, and one end of the pulling rope connecting the mounting cylinder is at the bottommost part of the mounting cylinder.

[0039] By adopting the above technical solution, since one end of the pulling rope is installed at a position on the side of the mounting cylinder away from the winding shaft, and the horizontal height of the winding shaft is lower than the horizontal height of the mounting cylinder, when the pulling rope pulls the mounting cylinder, the driving of the mounting block and the mounting cylinder to rotate synchronously can be completed; this structure has high synchronism, can reduce the setting of power sources, and reduce costs.

[0040] Preferably, the mounting plate is provided with a dovetail block adapted to a dovetail groove preset in the second beam section, and the dovetail block extends along the length direction of the mounting plate; the dovetail block is stabilized in the dovetail groove by a locking member;

[0041] Before hoisting the second beam section to be horizontally misaligned with the first beam section, the construction method further includes:

[0042] Insert the dovetail block into the dovetail groove, and limit the dovetail block through the locking member.

[0043] By adopting the above technical solution, the mutual cooperation of the dovetail block and the dovetail groove completes the preliminary positioning of the mounting plate, and then the dovetail block is limited through the locking member. This installation method has high efficiency and high installation stability.

[0044] Preferably, after step four, the construction method further includes:

[0045] Release the limit of the locking member on the dovetail block, pull the mounting plate, and completely remove the entire guiding mechanism.

[0046] By adopting the above technical solution, when the guiding mechanism needs to be disassembled, first loosen the restraint on the dovetail block through the locking member, and then pull out the mounting plate; and since the guiding wheel is in a horizontal state during this process, the process of pulling out the mounting plate is smoother, improving the construction efficiency.

[0047] In summary, the present application includes at least one of the following beneficial technical effects:

[0048] 1. The cap beam is formed into a Z shape to meet the clearance requirements of the original highway ramp after the erection of the steel cap beam;

[0049] 2. Appropriate hoisting methods are adopted for different environments to complete the hoisting of prefabricated components, with high hoisting efficiency and high safety;

[0050] 3. After the first beam segment is hoisted, the space between the first beam segment and the highway is very narrow. When the first beam segment is hoisted to the bottom of the highway, it is easy for the first beam segment to collide with the bottom of the highway. Since the weight of the first beam segment is measured in tons, the buffer stickers and steel plates are laid to protect the highway.

[0051] 4. During the hoisting of the second beam segment, first hoist the second beam segment to be horizontally misaligned with the first beam segment, and then use the guiding mechanism to clamp the second beam segment into the hollow position at the bottom of one side of the highway. Then, use the guiding mechanism to horizontally guide and move the second beam segment to directly above the first beam segment, and then lower the second beam segment to complete the erection of the second beam segment on the first beam segment. This construction process can reduce the collision between the second beam segment and the first beam segment and improve the construction safety.

[0052] 5. The guiding wheels can be steered by the drive of the drive assembly to meet the guiding in different directions.

[0053] 6. After the hoisting of one second beam segment is completed, removing one mounting plate can complete the disassembly of the entire guiding mechanism, which can be repeatedly applied to the hoisting of the next second beam segment. This not only has high construction efficiency but also can reduce costs. Description of the Drawings

[0054] Figure 1 It is a schematic diagram of the position between the existing highway and the highway ramp.

[0055] Figure 2 It is a schematic diagram of the position where the Z-shaped capping beam of the embodiment of the present application is erected between the highway and the highway ramp.

[0056] Figure 3 It is a schematic diagram of the structure when the first beam segment of the Z-shaped capping beam in the embodiment of the present application is hoisted.

[0057] Figure 4 It is a flow chart of the construction method for hoisting and segmenting the Z-shaped capping beam across the original ramp with low clearance in Embodiment 1 of the present application.

[0058] Figure 5 It is a schematic diagram of hoisting the second beam segment in the construction method for hoisting and segmenting the Z-shaped capping beam across the original ramp with low clearance in Embodiment 2 of the present application.

[0059] Figure 6 It is a cross-sectional view of the structure of the guiding mechanism used in the construction method for hoisting and segmenting the Z-shaped capping beam across the original ramp with low clearance in Embodiment 2 of the present application.

[0060] Figure 7 It is a schematic diagram of the structure of the guiding mechanism used in the construction method for hoisting and segmenting the Z-shaped capping beam across the original ramp with low clearance in Embodiment 2 of the present application, installed on the second beam segment.

[0061] Figure 8 Yes Figure 7 Partial enlarged view of A in

[0062] Explanation of reference numerals in the drawings:

[0063] 1. First beam segment; 11. Suspension ear; 2. Second beam segment; 21. Dovetail groove; 22. Limiting plate; 23. Fixing bolt; 3. Temporary support; 4. Pier; 5. Guiding mechanism; 51. Mounting plate; 511. Dovetail block; 52. Mounting block; 53. Torsion spring; 54. Mounting cylinder; 55. Telescopic rod; 56. Elastic member; 57. Guide wheel; 58. Driving assembly; 581. Assembly plate; 582. Pulling rope; 583. Reel; 584. Driving member; 101. Highway; 102. Highway approach ramp; 103. Highway ramp. Detailed implementation manners

[0064] The following further describes the present application in detail with reference to the attached Figures 1-8 drawings.

[0065] As Figure 1 shown, the horizontal height of the highway 101 is higher than that of the highway approach ramp 102, and the highway 101 and the highway approach ramp 102 are respectively located on both sides. The bottoms of both sides of the highway 101 are hollowed out and the top surface is an inclined surface, and the inclined surface slopes downward from the side of the highway 101 towards the cross beam of the highway 101.

[0066] An embodiment of the present application discloses a Z-shaped capping beam. Refer to Figure 2 , the Z-shaped capping beam includes a first beam segment 1 and a second beam segment 2. Both the first beam segment 1 and the second beam segment 2 are precast steel beams, and the cross-sections of both the first beam segment 1 and the second beam segment 2 are box-shaped; the first beam segment 1 is used to be arranged directly below the beam bottom of the highway 101. One end of the first beam segment 1 is directly below the beam bottom of the highway 101, and the other end is directly below the hollowed-out part at the bottom of one side of the highway 101; the second beam segment 2 is used to be arranged directly above the highway approach ramp 102. One end of the second beam segment 2 close to the first beam segment 1 overlaps on the first beam segment 1, and the first beam segment 1 and the second beam segment 2 are welded to form a Z-shaped capping beam.

[0067] The connection between the first beam segment 1 and the second beam segment 2 is arranged out of alignment with the highway approach ramp 102 in the horizontal direction, and the connection between the first beam segment 1 and the second beam segment 2 is located directly below the hollowed-out part at the bottom of one side of the highway 101 to meet the clearance requirements of the original highway approach ramp 102.

[0068] Refer to Figure 2 and Figure 3, lifting lugs 11 are preset at both opposite ends of the first beam segment 1. The lifting lug 11 at one end of the first beam segment 1 located directly below the beam bottom of the highway 101 is arranged at a position close to the bottom of the first beam segment 1, and the other lifting lug 11 of the first beam segment 1 is arranged at a position close to the top of the first beam segment 1; there is enough space to lift the first beam segment 1.

[0069] The embodiment of the present application also discloses a construction method for hoisting and segmenting a Z-shaped capping beam across an existing ramp with low clearance.

[0070] Embodiment 1

[0071] Refer to Figure 4 , the construction method includes:

[0072] S10: Construct piers 4 on both sides of the ground road. One pier 4 is located directly below the beam bottom of the highway 101 and on one side of the highway approach ramp 102, and the other pier 4 is located on the other side of the highway approach ramp 102, and a temporary support 3 is erected at the middle position between the two piers 4;

[0073] S20: Lay a buffer pad at the beam bottom position of the highway 101, and fix a steel plate on the side of the buffer pad away from the highway 101;

[0074] S30: Use two folding jib cranes to hoist the lifting lugs 11 at both ends of the first beam segment 1 respectively, and hoist the first beam segment 1 to a position directly below the beam bottom of the highway 101, so that both ends of the first beam segment 1 are respectively placed on one pier 4 and the temporary support 3, and the end of the first beam segment 1 located on the temporary support 3 is directly below the bottom hollow position on one side of the highway 101;

[0075] S40: Use a truck crane to hoist the second beam segment 2 to a position directly above the highway approach ramp 102, so that one end of the second beam segment 2 is placed on the end of the first beam segment 1 located on the temporary support 3, and the other end of the second beam segment 2 is placed on the other pier 4;

[0076] S50: Weld the overlapping positions of the first beam segment 1 and the second beam segment 2;

[0077] S60: Remove the temporary support 3;

[0078] S70: Lay the highway ramp 103 on the second beam segment 2.

[0079] Embodiment 2

[0080] The difference between this embodiment and Embodiment 1 is:

[0081] In S40, after hoisting the second beam segment 2 to a position directly above the ramp 102 of the high-speed approach bridge by a truck crane, before one end of the second beam segment 2 is laid on one end of the first beam segment 1 on the temporary support 3 and the other end of the second beam segment 2 is laid on another pier 4, the construction method includes:

[0082] S41: Hoist the second beam segment 2 to be horizontally misaligned with the first beam segment 1, and insert one end of the second beam segment 2 close to the first beam segment 1 into the bottom hollow position on one side of the highway 101 through the guiding mechanism 5, and maintain a gap between the first beam segment 1 and the second beam segment 2 in the vertical direction;

[0083] S42: Horizontally move the second beam segment 2 to directly above the first beam segment 1 through the guiding mechanism 5, and lower the first beam segment 1 so that one end of the second beam segment 2 is laid on the first beam segment 1.

[0084] Refer to Figure 5 and Figure 6 The guiding mechanism 5 includes a mounting plate 51, a mounting block 52, a torsion spring 53, a mounting cylinder 54, a telescopic rod 55, an elastic member 56, and a guiding wheel 57. The mounting plate 51 extends in the width direction of the second beam segment 2, and the mounting plate 51 is detachably preset on the end face of the second beam segment 2 close to the first beam segment 1; There are three mounting blocks 52, and the three mounting blocks 52 are rotatably mounted on the mounting plate 51 at intervals in the length direction of the mounting plate 51, and the rotating shaft of the mounting block 52 extends horizontally in a direction perpendicular to the mounting plate 51.

[0085] One end of the mounting cylinder 54 is hinged to the mounting block 52, the rotating shaft of the mounting cylinder 54 extends horizontally in a direction perpendicular to the rotating shaft of the mounting block 52, and the mounting cylinder 54 extends obliquely upward from the second beam segment 2; One end of the telescopic rod 55 is slidably mounted in the mounting cylinder 54 and the other end is outside the mounting cylinder 54; The elastic member 56 is a spring, the elastic member 56 is mounted in the mounting cylinder 54, one end of the elastic member 56 is fixedly mounted in the mounting cylinder 54 and the other end is fixedly mounted on the telescopic rod 55; The guiding wheel 57 is rotatably mounted at one end of the telescopic rod 55 outside the mounting cylinder 54.

[0086] The rotating shafts of the mounting blocks 52 and the mounting cylinder 54 are both sleeved with torsion springs 53. When the guiding wheel 57 is in a natural state, the arc surface of the guiding wheel 57 abuts against the top position of the bottom hollow on one side of the highway 101; Thus, guiding and buffering can be carried out during the process of inserting one end of the second beam segment 2 close to the first beam segment 1 into the bottom hollow position on one side of the highway 101.

[0087] Refer to Figure 6 and Figure 7, the guiding mechanism 5 further includes a driving assembly 58 for synchronously driving the mounting block 52 and the mounting cylinder 54 to rotate. The driving assembly 58 includes an assembly plate 581, a pulling rope 582, a winding shaft 583 and a driving member 584. The assembly plate 581 is horizontally arranged and fixedly installed on the mounting plate 51. The assembly plate 581 is located on one side of the end face of the second beam section 2. The winding shaft 583 is rotatably installed on the assembly plate 581, and the horizontal height of the winding shaft 583 is lower than the horizontal height of the mounting cylinder 54. The driving member 584 is a motor, and the driving member 584 is fixedly installed on the assembly plate 581. The rotating shaft of the driving member 584 is fixedly installed on the winding shaft 583, so as to drive the winding shaft 583 to rotate. There are three pulling ropes 582, and the three pulling ropes 582 correspond to the three mounting cylinders 54 respectively. One end of the pulling rope 582 is fixedly installed on the side of the mounting cylinder 54 away from the winding shaft 583, and the other end is wound on the winding shaft 583. Thus, by synchronously winding the three pulling ropes 582, the mounting block 52 and the mounting cylinder 54 can be driven to rotate synchronously.

[0088] Refer to Figure 7 and Figure 8 , a pair of dovetail blocks 511 are fixedly installed on one side of the mounting plate 51 close to the second beam section 2. The dovetail blocks 511 extend along the length direction of the mounting plate 51, and the two dovetail blocks 511 are arranged at intervals in the height direction of the second beam section 2. Dovetail grooves 21 for the dovetail blocks 511 to be inserted are formed at the positions of the second beam section 2 corresponding to the dovetail blocks 511. Locking members are arranged on the outer side wall of the second beam section 2 corresponding to the dovetail blocks 511. The locking members include a limiting plate 22 and a fixing bolt 23. The limiting plate 22 abuts against the end parts of the second beam section 2 and the dovetail blocks 511 at the same time. The limiting plate 22 is fixedly installed on the second beam section 2 through the fixing bolt 23, so that the dovetail blocks 511 can be restricted in the dovetail grooves 21 to complete the installation of the mounting plate 51.

[0089] The method of inserting the end of the second beam section 2 close to the first beam section 1 into the bottom hollow position on one side of the highway 101 through the guiding mechanism 5 in S41 includes:

[0090] S411: When hoisting the second beam section 2 to be horizontally misaligned with the first beam section 1, make the guiding wheel 57 abut against the side of the highway 101.

[0091] S412: Move the second beam section 2 towards the bottom hollow position on one side of the highway 101.

[0092] The method of horizontally moving the second beam section 2 to directly above the first beam section 1 through the guiding mechanism 5 in S42 includes:

[0093] S421: After the second beam segment 2 is completely moved into the bottom hollow position on one side of the highway 101, start the driving member 584 to drive the winding shaft 583 to rotate, so that the pulling rope 582 is wound until the guiding wheel 57 is pulled and swings to abut against the end position in the bottom hollow position on one side of the highway 101, and the end of the pulling rope 582 connected to the mounting cylinder 54 is at the bottommost part of the mounting cylinder 54.

[0094] Before S41, the construction method further includes:

[0095] Insert the dovetail block 511 into the dovetail groove 21 and limit the dovetail block 511 through the locking member.

[0096] After S50, the construction method further includes:

[0097] Release the limit of the dovetail block 511 by the locking member, pull the mounting plate 51, and completely remove the entire guiding mechanism 5, so that after hoisting one second beam segment 2, removing one mounting plate 51 can complete the disassembly of the entire guiding mechanism 5, and it can be repeatedly applied to the hoisting of the next second beam segment 2.

[0098] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A construction method for hoisting and segmenting a Z-shaped capping beam across an existing ramp with low clearance, characterized in that, It includes the following steps: Step 1: Construct piers (4) on both sides of the ground road. One pier (4) is located directly below the beam bottom of the highway (101) and on one side of the highway ramp (102), and the other pier (4) is located on the other side of the highway ramp (102). Then, set up a temporary support (3) between the two piers (4); Step 2: Use a folding boom crane to hoist the first beam segment (1) to a position directly below the beam bottom of the highway (101), such that the two ends of the first beam segment (1) are respectively placed on one pier (4) and the temporary support (3). The end of the first beam segment (1) located on the temporary support (3) is directly below the bottom hollow position on one side of the highway (101); Step 3: Use a truck crane to hoist the second beam segment (2) to a position directly above the highway ramp (102), such that one end of the second beam segment (2) is placed on the end of the first beam segment (1) located on the temporary support (3), and the other end of the second beam segment (2) is placed on the other pier (4); Step 4: Weld the overlapping positions of the first beam segment (1) and the second beam segment (2); Step 5: Remove the temporary support (3); Step 6: Lay the highway ramp (103) on the second beam segment (2); The Z-shaped capping beam includes a first beam segment (1) located directly below the beam bottom of the highway (101) and a second beam segment (2) located directly above the highway ramp (102). The horizontal height of the first beam segment (1) is lower than that of the second beam segment (2). The ends of the first beam segment (1) and the second beam segment (2) that are close to each other are connected. The connection between the first beam segment (1) and the second beam segment (2) is arranged in a horizontal offset with the highway ramp (102); the cross-sections of the first beam segment (1) and the second beam segment (2) are box-shaped; In Step 3, after using the truck crane to hoist the second beam segment (2) to a position directly above the highway ramp (102) and before making one end of the second beam segment (2) rest on the end of the first beam segment (1) located on the temporary support (3) and the other end of the second beam segment (2) rest on the other pier (4), the construction method further includes: Hoist the second beam segment (2) to be horizontally offset from the first beam segment (1), and insert the end of the second beam segment (2) close to the first beam segment (1) into the bottom hollow position on one side of the highway (101) through a guiding mechanism (5), so as to keep a gap between the first beam segment (1) and the second beam segment (2) in the vertical direction; Horizontally move the second beam segment (2) to directly above the first beam segment (1) through the guiding mechanism (5), and lower the first beam segment (1) so that one end of the second beam segment (2) rests on the first beam segment (1); The guiding mechanism (5) includes: a mounting cylinder (54), a telescopic rod (55), an elastic member (56), and a guiding wheel (57). The mounting cylinder (54) is preset on the end face of the second beam segment (2) close to the first beam segment (1), and the mounting cylinder (54) extends obliquely upward from the second beam segment (2); the telescopic rod (55) is slidably mounted in the mounting cylinder (54), and the guiding wheel (57) is mounted at one end of the telescopic rod (55) outside the mounting cylinder (54); the elastic member (56) is mounted in the mounting cylinder (54), with one end of the elastic member (56) connected inside the mounting cylinder (54) and the other end connected to the telescopic rod (55). The method of clamping one end of the second beam segment (2) close to the first beam segment (1) into the bottom hollow position on one side of the highway (101) through the guiding mechanism (5) includes: When hoisting the second beam segment (2) to be horizontally misaligned with the first beam segment (1), the guiding wheel (57) is brought into contact with the side of the highway (101). Move the second beam segment (2) into the bottom hollow position on one side of the highway (101). The guiding mechanism (5) further includes: a mounting plate (51), a mounting block (52), and a torsion spring (53). The mounting plate (51) extends in the width direction of the second beam segment (2), and the mounting plate (51) is detachably preset on the end face of the second beam segment (2) close to the first beam segment (1); the mounting block (52) is rotatably mounted on the mounting plate (51), and the rotating shaft of the mounting block (52) extends horizontally in a direction perpendicular to the mounting plate (51); the mounting cylinder (54) is hinged to the mounting block (52), and the rotating shaft of the mounting cylinder (54) extends horizontally in a direction perpendicular to the rotating shaft of the mounting block (52); the rotating shafts of the mounting block (52) and the mounting cylinder (54) are both sleeved with the torsion spring (53). When the guiding wheel (57) is in a natural state, the arc surface of the guiding wheel (57) abuts against the top position of the bottom hollow on one side of the highway (101); the guiding mechanism (5) further includes: a driving assembly (58) for synchronously driving the mounting block (52) and the mounting cylinder (54) to rotate. The method of horizontally moving the second beam segment (2) to directly above the first beam segment (1) through the guiding mechanism (5) includes: After completing the movement of the second beam segment (2) into the bottom hollow position on one side of the highway (101), start the driving assembly (58) to drive the guiding wheel (57) to swing to abut against the end position inside the bottom hollow position on one side of the highway (101), and the guiding wheel (57) rotates to a horizontal state.

2. The segmented construction method for hoisting a Z-shaped capping beam across an existing ramp with low clearance according to claim 1, characterized in that Between step one - step two, the construction method further includes: Lay a buffer sticker at the bottom position of the beam of the highway (101), and fix a steel plate on the side of the buffer sticker away from the highway (101).

3. A construction method for hoisting and segmenting a Z-shaped capping beam across an existing ramp with a low clearance, as described in claim 1, characterized in that The driving assembly (58) includes: a mounting plate (581), a pulling rope (582), and a winding shaft (583). The mounting plate (581) is mounted on the mounting plate (51). The mounting plate (581) is located on one side of the end face of the second beam segment (2). The winding shaft (583) is rotatably mounted on the mounting plate (581). The horizontal height of the winding shaft (583) is lower than the horizontal height of the mounting cylinder (54). One end of the pulling rope (582) is mounted on the side of the mounting cylinder (54) away from the winding shaft (583), and the other end is wound around the winding shaft (583). The driving assembly (58) further includes: a driving member (584) for driving the winding shaft (583) to rotate. The method for driving the guide wheel (57) to swing to an end position abutted against the bottom hollow position on one side of the highway (101) and for the guide wheel (57) to rotate to a horizontal state includes: Starting the driving member (584) to drive the winding shaft (583) to rotate, so that the pulling rope (582) is wound until the guide wheel (57) is pulled to swing to an end position abutted against the bottom hollow position on one side of the highway (101), and the end of the pulling rope (582) connected to the mounting cylinder (54) is at the bottommost part of the mounting cylinder (54).

4. A segmented construction method for hoisting a Z-shaped capping beam across an existing ramp with low clearance, according to claim 1, characterized in that The mounting plate (51) is provided with a dovetail block (511) adapted to a dovetail groove (21) preset in the second beam segment (2). The dovetail block (511) extends in the length direction of the mounting plate (51). The dovetail block (511) is stabilized in the dovetail groove (21) by a locking member. Before hoisting the second beam segment (2) to be horizontally misaligned with the first beam segment (1), the construction method further includes: Inserting the dovetail block (511) into the dovetail groove (21) and limiting the dovetail block (511) by the locking member.

5. A construction method for hoisting and segmenting a Z-shaped capping beam across an existing ramp with low clearance, according to claim 4, characterized in that After step four, the construction method further includes: Releasing the limit of the locking member on the dovetail block (511), pulling the mounting plate (51), and completely removing the entire guiding mechanism (5).

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