WO2022121320A1

WO2022121320A1 - Variable-span cable crane

Info

Publication number: WO2022121320A1
Application number: PCT/CN2021/107603
Authority: WO
Inventors: 赵梦春; 朱东明; 梁辉; 张延辉; 夏朝鹃; 杨志明; 郑奕; 李锋; 罗亚容; 龙俞伊; 王琪文; 白孔明; 陈洁; 常思鸣; 钟于靖; 高峰
Original assignee: 中铁九桥工程有限公司
Priority date: 2020-12-11
Filing date: 2021-07-21
Publication date: 2022-06-16
Also published as: ZA202207963B; CN112551360A

Abstract

A variable-span cable crane, comprising a main beam (1). The middle of the main beam (1) is a cable lifting mechanism (2), and two ends of the main beam (1) are two wing beams (3); the cable lifting mechanism (2) is connected to steel strands (21) equipped with hoists; a variable-span pushing mechanism (31) is mounted on each wing beam (3) in a direction away from the main beam (1); a transverse sliding path (32) is provided at the lower end of each wing beam (3); transverse sliding seats (33) mate with the transverse sliding paths (32); the transverse sliding seats (33) are connected to the variable-span pushing mechanisms (31); a walking end beam (4) is connected below each transverse sliding seat (33); each walking end beam (4) comprises a support beam (41) and a plurality of sets of walking wheels (42); the support beams (41) are fixedly connected to the transverse sliding seats (33); the walking wheels (42) are mounted below the supporting beams (41); the walking wheels (42) are located above main cables (5) of a suspension bridge and work in conjunction to walk. By means of the configuration, no external force is needed, a span changing action can be carried out automatically during construction; the span changing action is scientific and stable, free of potential safety hazards, and suitable for installation of a suspension bridge having a variable gap between main cables, the practicability of a cable crane is improved, the use range is expanded, and an optimal lifting tool is provided for installation of a suspension bridge having a variable gap between main cables.

Description

A variable-span cable-carrying crane

technical field

The invention belongs to the field of cable-carrying cranes for construction machinery, in particular to a variable-span cable-carrying crane.

Background technique

With the vigorous development of bridges in the world, suspension bridges and cable-stayed bridges are widely used. At present, the use of cable-mounted cranes for installation of suspension bridges and stay cables in China has become popular, but there is no precedent for variable-span cable-mounted cranes. Therefore, the existing cable-mounted cranes do not have the function of variable span, which leads to the inability to meet the needs of many complex engineering sites, restricts the application of cable-mounted cranes, and affects the efficiency of production and construction.

Aiming at the problem that the existing cable-mounted crane cannot realize the variable span, the present invention develops a variable-span cable-mounted crane, which does not require external force and can perform the span-changing action by itself during construction, which is practical for lifting the cable-mounted crane. The effect of performance and scope of application is remarkable.

technical problem

The existing cable-mounted cranes do not have the function of variable span, which leads to the inability to meet the needs of many complex engineering sites, restricts the application of cable-mounted cranes, and affects the efficiency of production and construction.

technical solutions

The invention develops a variable-span cable-carrying crane, which does not require external force, and can perform the variable-span movement by itself during construction, and the variable-span movement is scientific, stable, and free of potential safety hazards.

A variable-span cable-carrying crane includes a main beam 1, the middle of the main beam 1 is a cable-carrying hoisting mechanism 2, and two ends of the main beam 1 are two wing beams 3; The weight mechanism 2 is connected with the steel strand 21 equipped with the hanger; the wing spar 3 is installed with a variable-span pushing mechanism 31 in the direction away from the main beam 1, and the lower end of the wing spar 3 is provided with a traverse chute 32. A transverse sliding seat 33 is matched with the transverse sliding chute 32, and the transverse sliding seat 33 is connected with the variable-span pushing mechanism 31; a walking end beam 4 is connected below the transverse sliding seat 33 , the walking end beam 4 includes a supporting beam 41 and a plurality of groups of running wheels 42, the supporting beam 41 is fixedly connected with the traverse sliding seat 33, and the running wheel 42 is installed under the supporting beam 41; the The running wheel 42 is above the main cable 5 of the suspension bridge and runs cooperatively.

Further, the traveling end beam 4 and the traverse sliding seat 33 are hinged with pins.

Further, the running wheels 42 are 4 groups.

Further, the variable span pushing mechanism 31 is a traverse oil cylinder.

Further, the variable span pushing mechanism 31 uses a synchronous control platform, which can improve the safety and stability of the variable span.

The above design should ensure that when the advancing distance of the walking end beam 4 is L, the maximum safe transverse pushing or transverse pulling distance d of the variable-span pushing mechanism 31 should keep d/L≤3/100.

Further, a displacement space is set between the running wheel 42 and the main cable 5. During the running process, it is ensured that when the span is changed, the displacement of the running wheel 42 relative to the main cable 5 is within the displacement space. within. This design helps to improve the safety and stability when the span is changed. When the advancing distance of the walking end beam 4 is L, the maximum safe lateral pushing or lateral pulling distance d of the variable-span jacking mechanism 31 should be kept at d. /L≤5/100.

Further, the walking end beam 4 and the main beam 1 adopt an oblique design, and the oblique angle is set to (the angle between the tangent of the main cable 5 and the main beam 1 at the maximum span + the minimum span The angle between the tangent of the main cable 5 and the main beam 1)/2. This design helps to improve the safety and stability when the span is changed. When the advancing distance of the walking end beam 4 is L, the maximum safe lateral pushing or lateral pulling distance d of the variable-span jacking mechanism 31 should be kept at d. /L≤6/100.

Further, a ring of flanges 421 is provided in the middle of the running wheel 42 , and the main cable 5 is provided with a groove 51 matching the flanges 421 . This design can further improve the safety and stability when changing the span. When the advancing distance of the walking end beam 4 is L, the maximum safe transverse pushing or transverse pulling distance d of the variable-span pushing mechanism 31 should be maintained at d/ L≤10/100.

beneficial effect

Beneficial effects of the present invention:

1. The present invention provides a variable-span cable-carrying crane, which does not require external force, and can perform the variable-span action during construction by itself, and the variable-span action is scientific, stable, and has no potential safety hazards. It is suitable for the installation of suspension bridges with changing main cable spacing. , improve the practicability of the cable-mounted crane, expand the scope of use, and provide the best lifting tool for the installation of the suspension bridge with the change of the main cable spacing;

2. The present invention realizes that the walking end beam connected with the traverse sliding seat can change the span by setting the traverse sliding groove, the traverse sliding seat, and the variable-span pushing mechanism connected with the traverse sliding seat;

3. The use of a synchronous control platform for the variable-span jacking mechanism can ensure that the variable-span cable-carrying crane of the present invention is uniformly stressed and the center of gravity is stable during the variable-span, which can improve the safety and stability of the variable-span;

4. There is a displacement space between the running wheel and the main cable, which can ensure that when the span is changed, the displacement of the running wheel relative to the main cable is within the displacement space, so that the running wheel and the main cable will not be separated, and can be relative to each other. The horizontal push or horizontal pull distance of the lifting and variable span jacking mechanism is improved, which improves the safety and stability of the variable span, as well as the efficiency of the variable span;

5. The walking end beam and the main beam adopt the oblique design, and the oblique angle is set to (the angle between the tangent line of the main cable 5 and the main beam 1 at the maximum span + the tangent line of the main cable 5 and the main beam 1 at the minimum span. The included angle of the main beam 1)/2, this design helps to improve the lateral push or lateral pull distance of the variable span jacking mechanism, improve the safety and stability when the span is changed, and the efficiency;

6. There is a flange in the middle of the running wheel, and the main cable is provided with a groove matching the flange. When the span is changed, the running wheel and the main cable are tightly connected. This design can further improve the efficiency of the variable-span push mechanism. The transverse push or transverse pull distance improves the safety and stability when changing the span, as well as the efficiency of changing the span.

Description of drawings

Fig. 1 is the general view of the variable-span cable-carrying crane of the present invention;

Fig. 2 is the assembly diagram of the traverse chute and the traverse sliding seat of the present invention;

Fig. 3 is the sectional view of the traverse chute of the present invention;

Fig. 4 is the sectional view of the traverse sliding seat of the present invention;

Fig. 5 is the state diagram of the variable span when the walking end beam of the present invention advances L;

6 is a working diagram of the walking end beam and the main cable in Embodiment 1 of the present invention;

7 is a working diagram of the walking end beam and the main cable in Embodiment 2 of the present invention;

Fig. 8 is the oblique intersection view of the walking end beam and the main beam in Embodiment 3 of the present invention;

9 is a schematic diagram of the included angle between the tangent line of the main cable and the main beam when the variable-span cable-carrying crane of the present invention has a maximum span;

10 is an enlarged view of the angle between the main cable tangent and the main beam when the variable-span cable-carrying crane of the present invention has a maximum span;

11 is a schematic diagram of the angle between the main cable tangent and the main beam when the minimum span of the variable-span cable-carrying crane of the present invention;

Figure 12 is an enlarged view of the angle between the main cable tangent and the main beam when the variable-span cable-carrying crane of the present invention has a minimum span;

Figure 13 is a working diagram of the running wheel and the main cable according to Embodiment 4 of the present invention;

In the figure, 1-main beam, 2-cable lifting mechanism, 21-steel strand, 3-wing spar, 31-variable span jacking mechanism, 32-traverse chute, 33-traverse sliding seat, 4 - Travel end beam, 41 - Support beam, 42 - Travel wheel, 421 - Flange, 5 - Main cable, 51 - Groove

BEST MODE FOR CARRYING OUT THE INVENTION

A variable-span cable-carrying crane, as shown in Figure 1, includes a main beam 1, the middle of the main beam 1 is a cable-carrying hoisting mechanism 2, and the two ends of the main beam 1 are two wing beams 3; The cable-carrying hoisting mechanism 2 is connected with the steel strand 21 equipped with the sling; the wing spar 3 is installed with a variable span pushing mechanism 31 in the direction away from the main beam 1, and the lower end of the wing spar 3 is provided with a The traverse chute 32, as shown in FIG. 3, is matched with the traverse chute 32 with a traverse sliding seat 33, as shown in FIG. 4, the traverse sliding seat 33 is connected with the variable span pushing mechanism 31; the A traveling end beam 4 is connected below the traverse sliding seat 33, and the traveling end beam 4 includes a supporting beam 41 and a plurality of groups of traveling wheels 42. The supporting beam 41 is fixedly connected with the traversing sliding seat 33, and the traveling wheels 42 is installed under the support beam 41; the running wheel 42 is above the main cable 5 of the suspension bridge and runs cooperatively.

The traveling end beam 4 and the traverse sliding seat 33 are hinged with a pin shaft, the traveling wheels 42 are four groups, and the variable span pushing mechanism 31 is a traverse oil cylinder.

The variable span pushing mechanism 31 uses a synchronous control platform, which can improve the safety and stability of the variable span.

A flange 421 is provided in the middle of the running wheel 42 , and the main cable 5 is provided with a groove 51 matching the flange 421 .

Embodiments of the present invention

Example 1

During operation, the running wheel 42 is placed on the main cable 5, and when the span needs to be changed, the connected traverse slide 33 is pushed or pulled horizontally by the span-change push mechanism 31, and the traverse slide 33 is traversing. The chute 32 moves inward, as shown in Figure 2; at the same time, the traveling end beam 4 connected with the traverse sliding seat 33 has the action of pushing out or retracting. It has a certain locking effect, as shown in Figure 6, so the main cable 5 is pushed outward or retracted with the action of the walking end beam 4, so as to achieve the effect of changing the span. After the span change is completed, the cable-carrying hoisting mechanism is hoisted through steel strands.

As shown in Fig. 5, when the above-mentioned variable-span cable-borne crane is working, the initial state span is B1. Through the horizontal pulling action of the variable-span jacking mechanism 31, the horizontal pulling distance is d, and when the variable-span cable-borne crane moves forward L distance After that, its state is span B2, which has:

d=(B1-B2)/2

After a large number of experiments, when the above-mentioned variable-span cable-borne crane works with variable spans, when the advancing distance of the walking end beam 4 is L, the maximum safe transverse pushing or transverse pulling distance d of the variable-span jacking mechanism 31 should be maintained at d/ L≤3/100. Within this range, the main cable will not break away from the limitation of the running wheel, and the span-changing action is smooth and safe.

Example 2

On the basis of Embodiment 1, a variable-span cable-mounted crane is provided, and a displacement space is set between the running wheel 42 and the main cable 5. During the running process, it is ensured that when the span is changed, the running The displacement of the wheel 42 relative to the main cable 5 is within the displacement space, as shown in FIG. 7 .

In this embodiment, the design of the tight cooperation between the running wheel and the main cable in the first embodiment is changed, but a displacement space is set between the running wheel and the main cable. This design helps to improve the safety and stability when changing the span. Spend.

After a large number of experiments, when the above-mentioned variable-span cable-borne crane works with variable spans, when the advancing distance of the walking end beam 4 is L, the maximum safe transverse pushing or transverse pulling distance d of the variable-span jacking mechanism 31 should be maintained at d/ L≤5/100. Compared with Embodiment 1, in this embodiment, the main cable is less likely to escape from the limitation of the running wheel, so the maximum safe transverse pushing or transverse pulling distance of the variable-span pushing mechanism is correspondingly increased.

Example 3

On the basis of Example 1, a variable-span cable-carrying crane, the walking end beam 4 and the main beam 1 adopt a skew design, and the skew angle is set to (when the maximum span is the tangent of the main cable 5 The included angle with the main beam 1 + the included angle between the tangent line of the main cable 5 and the main beam 1 at the minimum span)/2.

As shown in Figure 8, the oblique angle between the walking end beam 4 and the main beam 1 is θ;

As shown in Figure 9 and Figure 10, the angle between the tangent line of the main cable 5 and the main beam 1 is α when the maximum span is reached;

As shown in Figure 11 and Figure 12, the angle between the tangent line of the main cable 5 and the main beam 1 is β at the minimum span;

set up:

θ=(α+β)/2

This design reduces the lateral displacement of the main cable relative to the walking end beam, and also reduces the lateral stress of the main cable when the span is changed, which helps to improve the safety and stability when the span is changed.

After a large number of experiments, when the above-mentioned variable-span cable-borne crane works with variable spans, when the advancing distance of the walking end beam 4 is L, the maximum safe transverse pushing or transverse pulling distance d of the variable-span jacking mechanism 31 should be maintained at d/ L≤6/100.

Example 4

On the basis of Embodiment 1, a variable-span cable-carrying crane is provided, a ring of flanges 421 is provided in the middle of the traveling wheel 42, and the main cable 5 is provided with a groove 51 matching the flanges 421, such as Figure 13.

This design can greatly enhance the restraint effect of the running wheel on the main cable, making the main cable more stable when the span is changed, and can greatly improve the safety and stability when the span is changed.

After a large number of experiments, when the above-mentioned variable-span cable-borne crane works with variable spans, when the advancing distance of the walking end beam 4 is L, the maximum safe transverse pushing or transverse pulling distance d of the variable-span jacking mechanism 31 should be maintained at d/ L≤10/100.

Finally: the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the present invention. within the scope of protection.

Industrial Applicability

The variable-span cable-carrying crane developed by the present invention does not require external force, and can perform the variable-span action by itself during construction, and has a significant effect on the practicability and application scope of the lifting cable-carrying crane.

Sequence Listing Free Content

Type the Sequence Listing free content description paragraph here.

Claims

A variable-span cable-carrying crane, characterized in that the variable-span cable-carrying crane comprises a main beam (1), the middle of the main beam (1) is a cable-carrying hoisting mechanism (2), and the The two ends of the main beam (1) are two wing spars (3); the cable-carrying hoisting mechanism (2) is connected with the steel strand (21) equipped with a spreader; the wing spars (3) are far away from the A variable span pushing mechanism (31) is installed in the direction of the main beam (1), and the lower end of the wing spar (3) is provided with a traverse chute (32), which is matched with the traverse chute (32). A traverse sliding seat (33) is connected with the variable span pushing mechanism (31); a walking end beam (4) is connected below the traverse sliding seat (33), so The walking end beam (4) includes a supporting beam (41) and a plurality of groups of running wheels (42), the supporting beam (41) is fixedly connected with the traverse sliding seat (33), and the running wheels (42) are installed Below the support beam (41); the running wheel (42) is above the main cable (5) of the suspension bridge and runs cooperatively.
A variable-span cable-carrying crane according to claim 1, characterized in that: the traveling end beam (4) and the traverse sliding seat (33) are hinged with a pin shaft, and the traveling wheel (42) There are 4 groups, and the variable-span pushing mechanism (31) is a traverse oil cylinder.
A variable-span cable-carrying crane according to claim 1, characterized in that: the variable-span jacking mechanism (31) uses a synchronous control platform.
A variable-span cable-carrying crane according to any one of claims 1-3, characterized in that: when the advancing distance of the walking end beam (4) is L, the variable-span jacking mechanism (31) is the largest The safe transverse push or transverse pull distance d should keep d/L≤3/100.
A variable-span cable-mounted crane according to claim 1, characterized in that: a displacement space is set between the running wheel (42) and the main cable (5), and during the running process, it is ensured During the span, the displacement of the running wheel (42) relative to the main cable (5) is within the displacement space.
A variable-span cable-carrying crane according to claim 5, characterized in that: when the traveling end beam (4) moves forward with a distance of L, the variable-span jacking mechanism (31) can push horizontally or horizontally for maximum safety. The pulling distance d should keep d/L≤5/100.
A variable-span cable-carrying crane according to claim 1, characterized in that: the walking end beam (4) and the main beam (1) adopt a skew design, and the skew angle is set to (maximum span the angle between the tangent of the main cable (5) and the main beam (1) + the angle between the tangent of the main cable (5) and the main beam (1) at the minimum span)/2.
A variable-span cable-carrying crane according to claim 7, characterized in that: when the traveling end beam (4) moves forward with a distance of L, the variable-span jacking mechanism (31) can push horizontally or horizontally with maximum safety. The pulling distance d should keep d/L≤6/100.
A variable-span cable-carrying crane according to claim 1, characterized in that: a ring of flanges (421) is arranged in the middle of the running wheel (42), and the main cable (5) is arranged with the flange (421) Rim (421) matches groove (51).
A variable-span cable-carrying crane according to claim 9, characterized in that: when the traveling end beam (4) moves forward with a distance of L, the variable-span jacking mechanism (31) can push horizontally or horizontally for maximum safety. The pulling distance d should keep d/L≤10/100.