A beam hoist structure for a beam moving machine of a precast box girder

Abstract

The utility model relates to a hoist structure of beam moving machine for prefabricated box girder, the utility model discloses two groups of beam support, two groups of beam support are along the first direction interval setting and respectively along the second direction extension, two groups of beam support are along the symmetry section of second direction of the symmetric setting of the hoisting prefabricated box girder, and two fender plates that can be adjusted along the second direction are arranged on each beam support, two groups of beam press, each beam press includes two parallelly arranged and along the first direction extension crossbeam and two parallelly arranged and along the second direction extension longitudinal beam, and the both ends of each longitudinal beam are connected with two crossbeams respectively, and the centre line of beam support passes through the symmetry section of second direction of beam press, and the both ends along the length direction of each crossbeam are provided with the lifting lug for being connected with the movable pulley group of beam moving machine hoist trolley, and the both ends of each beam support along the second direction are connected with the middle part of the corresponding two crossbeams with the lifting cable. The utility model can realize the synchronous, balanced lifting of long-distance continuous beam segment.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction equipment technology, and in particular to a lifting device structure for a beam-moving machine used for precast box girders. Background Technology

[0002] In the hoisting and installation of precast box girders, most existing methods employ single-machine hoisting, which has significant technical drawbacks. Specifically, it suffers from limited span: when the box girder length exceeds 40 meters, single-point hoisting can easily generate excessive bending moments in the middle of the girder, potentially leading to concrete cracking or prestress loss and other structural safety hazards. Furthermore, it lacks stability: for ultra-long girder segments, single-machine hoisting cannot achieve real-time, precise dynamic leveling, often requiring manual counterweighting to maintain balance, resulting in low operational efficiency and significant safety risks.

[0003] Although dual-machine lifting operations exist, which can improve the lifting capacity of long beams, there are still many shortcomings in practical applications. These are mainly reflected in uneven load distribution: because the two lifting machines are controlled independently, asynchronous operation is prone to occur during cooperation, resulting in localized stress concentration on the beam, which increases the risk of structural deformation or even damage; and lack of specialized lifting equipment: the existing temporary assembled lifting equipment has poor structural compatibility and is difficult to adjust flexibly according to the specific requirements of the box girder cross-section or variable height box girder, resulting in insufficient adaptability and safety.

[0004] In addition, existing methods mostly use traditional anti-tipping measures such as welded fixed baffles or wire rope binding. These measures require manual reinforcement before each hoisting operation, which is cumbersome, time-consuming, and prone to omissions, affecting construction safety. Furthermore, fixed baffles cannot adapt to box girders with different flange widths, requiring frequent replacement of parts, which reduces construction efficiency. Summary of the Invention

[0005] To address this, this utility model provides a lifting device structure for a beam-moving machine used for precast box girders. By setting up pressure beams and support beams, and adopting a split-type lifting device assembly, a set of lifting devices is divided into two groups during the lifting operation, which are installed on two beam-moving machines respectively. Through the cooperation of the two machines, the synchronous and balanced lifting of long-distance continuous beam segments can be achieved, effectively avoiding problems such as excessive bending moment in the middle and insufficient structural stability caused by single-machine lifting, and improving the safety and efficiency of lifting ultra-long box girders.

[0006] To solve the above-mentioned technical problems, this utility model provides a lifting device structure for a beam-moving machine used for precast box girders, comprising:

[0007] Two sets of support beams are used to support the bottom end of the precast box girder to be hoisted. The two sets of support beams are spaced apart along a first direction and extend along a second direction respectively. The two sets of support beams are symmetrically arranged along the symmetrical cross section of the precast box girder to be hoisted along the second direction. Each support beam is provided with two baffles that can be adjusted along the second direction. The two baffles can abut against the two sides of the bottom of the precast box girder to be hoisted. The first direction and the second direction are the length direction and the width direction of the precast box girder to be hoisted, respectively.

[0008] Two sets of pressure beams are used to press against the top of the precast box girder to be hoisted. Each pressure beam includes two parallel horizontal beams extending along the first direction and two parallel longitudinal beams extending along the second direction. The two ends of each longitudinal beam are respectively connected to the two horizontal beams. The center line of the support beam passes through the symmetrical section of the pressure beam along the second direction. Both ends of each horizontal beam are provided with lifting lugs for connecting to the movable pulley block of the lifting trolley of the beam-moving machine.

[0009] The slings are connected between the two ends of each of the supporting beams along the second direction and the middle of the corresponding two crossbeams.

[0010] In one embodiment of this utility model, the bottom end of the support beam is provided with a load-bearing moving wheel.

[0011] In one embodiment of this utility model, a total of eight lifting lugs are provided.

[0012] In one embodiment of this utility model, the movable pulley assembly includes a mounting base and two movable pulleys disposed on the mounting base, and the lifting lug is connected to the mounting base by a pin and an anti-detachment snap ring.

[0013] In one embodiment of this utility model, the support beam is provided with an adjustment groove, the baffle is connected to the adjustment groove by an adjustment bolt, and the side of the baffle facing the precast box beam to be hoisted is provided with an anti-slip layer.

[0014] In one embodiment of this utility model, the supporting beam, the crossbeam, and the longitudinal beam are all box beam structures.

[0015] In one embodiment of this utility model, the sling adopts a flexible cold-cast anchor, and the two ends of the cold-cast anchor pass through and connect to the corresponding support beam and the crossbeam.

[0016] In one embodiment of this utility model, two lifting trolleys of the beam-moving machine are provided. The two lifting trolleys of the beam-moving machine are symmetrically arranged on both sides of the precast box girder to be lifted along the first direction, and are respectively connected to the corresponding lifting lugs on a set of supporting beams through the movable pulley group.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0018] This utility model describes a lifting device structure for a precast box girder transporter. It employs a split-type lifting device assembly design, dividing the lifting device structure into two groups, each installed on one of two transporters. Through coordinated operation of the two machines, it achieves synchronous and balanced lifting of ultra-long precast box girder segments. This effectively solves the problems of limited span and insufficient stability in traditional single-machine lifting, improving the overall safety and operational efficiency of ultra-long box girder lifting. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a front view structural diagram of the lifting device structure for the beam-moving machine used in precast box girders according to this utility model.

[0021] Figure 2 This is a side view of the lifting device structure of the beam-moving machine used for precast box girders according to this utility model.

[0022] Figure 3 This utility model relates to the lifting device structure for a beam-moving machine used for precast box girders. Figure 2 (Top view of the structure)

[0023] Figure 4 This is the main view of the movable pulley block of this utility model.

[0024] Figure 5 This is a top view of the movable pulley block of this utility model.

[0025] Figure 6 This is a structural diagram of the sling of this utility model.

[0026] Figure 7 This is a front view of the lifting device structure of the beam-moving machine for precast box girders in operation.

[0027] Figure 8 This is a side view of the lifting device structure of the beam-moving machine used for precast box girders in operation.

[0028] Explanation of reference numerals on the accompanying drawings:

[0029] 1. Support beam; 11. Baffle; 12. Load-bearing casters;

[0030] 2. Pressure beam; 21. Horizontal beam; 22. Longitudinal beam; 23. Lifting lug;

[0031] 3. Slings;

[0032] 4. Precast box girders awaiting hoisting;

[0033] 5. Lifting trolley of the beam-moving machine;

[0034] 6. Movable pulley block; 61. Mounting base; 62. Movable pulley. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0036] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0037] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0038] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0039] Reference Figures 1 to 3 As shown, the present invention provides a lifting device structure for a beam-moving machine used for precast box girders, comprising:

[0040] Two sets of support beams 1 are used to support the bottom end of the precast box girder 4 to be hoisted. The two sets of support beams 1 are spaced apart along the first direction and extend along the second direction respectively. The two sets of support beams 1 are symmetrically arranged along the symmetrical cross section of the precast box girder 4 to be hoisted along the second direction. Each support beam 1 is provided with two baffles 11 that can be adjusted and moved along the second direction. The two baffles 11 can respectively abut against the two sides of the bottom of the precast box girder 4 to be hoisted. The first direction and the second direction are the length direction and the width direction of the precast box girder 4 to be hoisted, respectively.

[0041] Two sets of pressure beams 2 are used to press against the top of the precast box girder 4 to be hoisted. Each pressure beam 2 includes two parallel horizontal beams 21 extending along the first direction and two parallel longitudinal beams 22 extending along the second direction. The two ends of each longitudinal beam 22 are respectively connected to the two horizontal beams 21. The center line of the support beam 1 passes through the symmetrical section of the pressure beam 2 along the second direction. Both ends of each horizontal beam 21 along the length direction are provided with lifting lugs 23 for connecting to the movable pulley block 6 of the lifting trolley 5 of the beam-moving machine.

[0042] The sling 3 is connected between the two ends of each of the supporting beams 1 along the second direction and the middle of the corresponding two crossbeams 21.

[0043] The use of a split-type lifting device group allows for the balanced lifting of ultra-long continuous beam segments using a beam-moving machine; the support beam 1 is equipped with an adjustable baffle 11 to prevent the beam segment from tipping over and can be adjusted according to different beam structures.

[0044] In one embodiment, refer to Figure 3 As shown, the bottom end of the support beam 1 is provided with a load-bearing moving wheel 12, and there are a total of eight lifting lugs 23.

[0045] In one embodiment, refer to Figure 4 , Figure 5 As shown, the movable pulley block 6 includes a mounting base 61 and two movable pulleys 62 disposed on the mounting base 61. The lifting lug 23 is connected to the mounting base 61 by a pin and an anti-detachment snap ring.

[0046] In one embodiment, refer to Figure 1 As shown, the support beam 1 is provided with an adjustment groove, and the baffle 11 is connected to the adjustment groove by an adjustment bolt. The side of the baffle 11 facing the precast box beam 4 to be hoisted is provided with an anti-slip layer.

[0047] In one embodiment, the supporting beam 1, the crossbeam 21, and the longitudinal beam 22 are all box girder structures. Box girder structures can balance structural strength and lightweight requirements.

[0048] In one embodiment, refer to Figure 6 As shown, the sling 3 uses a flexible cold-cast anchor, with both ends passing through and connecting the corresponding support beam 1 and crossbeam 21. The flexible structure of the sling 3 significantly reduces the positional accuracy requirements of the beam segments during hoisting and handling. It should be noted that the cold-cast anchor is an existing structure, including components such as a nut, anchor ring, cold-cast material, high-strength steel wire, and sling body.

[0049] In one embodiment, refer to Figure 7 , Figure 8 As shown, there are two lifting trolleys 5 of the beam-moving machine. The two lifting trolleys 5 are symmetrically arranged on both sides of the precast box girder 4 to be lifted along the first direction, and are respectively connected to the corresponding lifting lugs 23 on a set of supporting beams 1 through the movable pulley group 6.

[0050] During operation, two tire-mounted beam movers are symmetrically arranged according to the designed span, which is typically 1.2 to 1.5 times the length of the precast box girder to be lifted. A laser rangefinder is used to calibrate the span, ensuring that the distance error between the two beam movers along the length of the box girder is no greater than ±10mm. After initial positioning, the positioning locking device of the beam movers is activated to prevent displacement during operation.

[0051] The eight lifting lugs 23 on the top of the two pressure beams 2 are aligned with the movable pulley block 6 of the lifting trolley 5 of the beam-moving machine. The lifting lugs 23 are bolted to the mounting seats 61 of the movable pulley block 6 using pins. Anti-loosening snap rings are inserted to prevent the pins from falling off, and lubricant is evenly applied to the pin surface to reduce frictional wear of the connecting parts and extend their service life. Simultaneously, pressure sensors can be used to detect the stress on each lifting lug 23. When the single-point load deviation of any lifting lug 23 exceeds 5%, the system automatically prompts that the pin tightening sequence needs to be readjusted to ensure balanced stress at all points.

[0052] The cold-cast anchor cables 3 are connected to both ends of the support beam 1 and the middle of the corresponding pressure beam 2 crossbeam 21, and each cable 3 is pre-tightened by a hydraulic tensioner to ensure that the pre-tightening force of the cable 3 is evenly distributed and the difference in cable force is no more than 3%. After the cable 3 is connected, a deflection compensation of ±5° is allowed to accommodate the small posture error of the precast box girder and improve the flexibility and safety of the hoisting.

[0053] The support beam 1 is equipped with a movable baffle 11 via an adjustment groove and adjustment bolts. According to the bottom width parameters of the box girder to be hoisted, the position of the baffle 11 is adjusted to fit against the bottom two end faces of the box girder. The contact pressure between the anti-slip layer of the baffle 11 and the box girder is not less than 0.2MPa to prevent the box girder from shifting or causing safety accidents due to slippage during hoisting.

[0054] Each connection point and pressure sensor completes a system pressure self-check, confirming that all stress, connection status, tension status, and anti-slip measures meet the set standards before proceeding to the hoisting operation.

[0055] Two beam-moving machines were started to work together to slowly lift the box girder to 10cm off the ground and then pause. The synchronization error of the two machines was monitored in real time to ensure that the beam was in a balanced and stable state.

[0056] During the lifting operation, the lifting speed should be controlled to be no more than 0.5 m / min to minimize dynamic load impact and ensure the safety of the connection between the beam structure and the lifting equipment.

[0057] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A lifting device structure for a beam-moving machine used for precast box girders, characterized in that, include: Two sets of support beams (1) are used to support the bottom end of the precast box girder (4) to be hoisted. The two sets of support beams (1) are spaced apart along the first direction and extend along the second direction respectively. The two sets of support beams (1) are symmetrically arranged along the symmetrical cross section of the precast box girder (4) to be hoisted along the second direction. Each support beam (1) is provided with two baffles (11) that can be adjusted along the second direction. The two baffles (11) can abut against the two sides of the bottom of the precast box girder (4) to be hoisted respectively. The first direction and the second direction are the length direction and the width direction of the precast box girder (4) to be hoisted, respectively. Two sets of pressure beams (2) are used to press against the top of the precast box girder (4) to be hoisted. Each pressure beam (2) includes two parallel horizontal beams (21) extending along the first direction and two parallel longitudinal beams (22) extending along the second direction. The two ends of each longitudinal beam (22) are respectively connected to the two horizontal beams (21). The center line of the support beam (1) passes through the symmetrical section of the pressure beam (2) along the second direction. Both ends of each horizontal beam (21) along the length direction are provided with lifting lugs (23) for connecting to the movable pulley group (6) (6) of the beam-moving machine hoisting trolley (5). The slings (3) are connected between the two ends of each of the beams (1) along the second direction and the middle of the corresponding two beams (21).

2. The lifting device structure for a beam-moving machine for precast box girders according to claim 1, characterized in that, The bottom end of the support beam (1) is provided with a load-bearing moving wheel (12).

3. The lifting device structure for a beam-moving machine for precast box girders according to claim 1, characterized in that, There are a total of eight lugs (23).

4. The lifting device structure for a beam-moving machine for precast box girders according to claim 1, characterized in that, The movable pulley assembly (6) includes a mounting base (61) and two movable pulleys (62) disposed on the mounting base (61). The lifting lug (23) is connected to the mounting base (61) by a pin and an anti-detachment snap ring.

5. The lifting device structure for a beam-moving machine for precast box girders according to claim 1, characterized in that, The support beam (1) is provided with an adjustment groove, and the baffle (11) is connected to the adjustment groove by an adjustment bolt. The side of the baffle (11) facing the precast box beam (4) to be hoisted is provided with an anti-slip layer.

6. The lifting device structure for a beam-moving machine for precast box girders according to claim 1, characterized in that, The supporting beam (1), the crossbeam (21) and the longitudinal beam (22) are all box beam structures.

7. The lifting device structure for a beam-moving machine for precast box girders according to claim 1, characterized in that, The sling (3) adopts a flexible cold-cast anchor, and the two ends of the cold-cast anchor pass through and connect to the corresponding support beam (1) and the crossbeam (21).

8. The lifting device structure for a beam-moving machine for precast box girders according to claim 1, characterized in that, Two lifting trolleys (5) of the beam-moving machine are provided. The two lifting trolleys (5) are symmetrically arranged on both sides of the precast box girder (4) to be lifted along the first direction, and are respectively connected to the corresponding lifting lugs (23) on a set of supporting beams (1) through the movable pulley group (6).

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