CN101693501B - Deck unit erection gantry for hoisting by large deflection angle - Google Patents

Abstract

The invention relates to a deck unit erection gantry for hoisting by a large deflection angle. A principle axis of a fixed pulley block is arranged between two cross links; a movable pulley block is arranged below the fixed pulley block; a lifting appliance is connected below the movable pulley block; one end of a hoist rope is directly connected with a lifting hoister, and the other end thereof is anchored on an underbeam by sequentially bypassing the fixed pulley block and the movable pulley block; and one end of an auxiliary wire rope is connected with an auxiliary hoist, and the other end thereof is installed on the movable pulley block or a hoisting section directly or indirectly connected with the movable pulley block. The deck unit erection gantry has the advantages of convenient installation, lower cost and safety and reliability, and capability of hoisting the beam section with larger deflection angle and the like, and is applicable to the erection of suspension bridges in mountainous areas.

Description

Cable-span crane for large deflection hoisting

technical field

The invention relates to a cable-spanning crane, in particular to a cable-spanning crane hoisted at a large deflection angle, which is suitable for erecting suspension bridges in mountainous areas.

Background technique

With the rapid development of my country's national economy, more and more highways are built in mountainous areas, and suspension bridges in mountainous areas continue to emerge. At present, the erection of stiffening girders of suspension bridges with a span of less than 800m in mountainous areas mainly adopts the "cable hoisting method" ^{[1, 2]} . When the span is larger, it is difficult to meet the economic requirements; for steel truss girders, the "deck crane rod assembly method" can be used ^[3] , but the control design of the stiffening girder supporting the deck crane may be determined by the force of the hoisting state of the deck crane, which increases the cost. At the same time, the weight of the assembled unit is limited (smaller), and the construction period is long. Therefore, it is necessary to find a method with wider adaptability, more economical, more convenient, safe and reliable.

The "vertical hoisting method of a cable-span crane" is a mature and reliable method for erecting stiffening girders of suspension bridges ^[4-8] , but it is only applicable to suspension bridges spanning large rivers or bays. Unlike suspension bridges that span large rivers or bays, etc., the terrain under the suspension bridge in mountainous areas is rugged (the depth of the valley may be hundreds of meters), and there is no condition for beam transportation or most of the beam sections cannot be transported directly below their position. Therefore, if a well-recognized, mature and reliable cable-spanning crane is used to hoist the stiffening girder of a suspension bridge in mountainous areas, the lifting rope must have a vertical deflection angle along the bridge direction (that is, oblique lifting), and the original cable-spanning crane is difficult to meet this requirement. kind of request.

Existing cable span cranes are divided into hydraulic type and winch type. Due to the poor bending fatigue performance of the hoisting steel strands or high-strength thick steel bars ^{[9, 10]} , the hydraulic cable span crane is not suitable for hoisting at large deflection angles. However, in the past winch-type spanning cable cranes ^{[5, 6, 8]} , although the bending fatigue performance of the hoisting steel wire rope is better, the hoisting rope will be damaged due to the continuous change of the vertical deflection angle during the hoisting process. The lower chord of the beam around the cable spanning crane is bent, and the force of the spanning cable crane is unfavorable and it is not suitable for hoisting at a large deflection angle. Therefore, it is necessary to improve the structure of the traditional cable span crane.

references:

[1] Chen Yiming, Tan Yonggao, Wu Youyu. Local stress analysis of steel truss girder joint plate of Siduhe Bridge [J]. Bridge Construction, 2008, (1): 58-61;

[2] Liu Wendeng, Liu Yan. Construction Design of Cable Crane for Large-span Suspension Bridge in Mountainous Areas [J]. Highway and Auto Transport, 2008, (5): 119-121;

[3] Sun Huiyuan, Chen Cailin, Meng Fanchao, etc. Research on the technical scheme of construction machinery and tools for the erection of the Baling River Bridge [J]. Highway, 2007, (2): 72-74;

[4] Wang Shulin, Fang Qianqian, Dong Bo, etc. Construction Technology of Humen Bridge Hydraulic Lifting Span Cable Crane [C]. China Civil Engineering Society. Proceedings of the Twelfth Annual Conference of China Civil Engineering Society Bridge and Structural Engineering Society (Volume 1) ).1996:182-188;

[5] Xue Guangxiong, Chuai Guoxin, Li Peng, etc. The steel box girder hoisting construction scheme of the Haicang Bridge [C]. Dai Jing. Proceedings of the 1999 Bridge Symposium of the Bridge and Structural Engineering Society of the China Highway Society. Beijing : People's Communications Press, 1999: 229-239;

[6] Lin Ruian, Xia Zijin, Fang Qianqian. Design of cable-carried crane for Yichang Yangtze River Highway Bridge [J]. World Bridge, 2004(3): 21-23;

[7] Wu Shengdong, Feng Zhaoxiang, Jiang Bo. Research on key technologies of superstructure construction of super long-span suspension bridge [J]. Chinese Journal of Civil Engineering, 2007, 40(4): 32-37;

[8] Zhao Hong, Xie Haibo. Static load test research on the cable-span crane of the South Branch Suspension Bridge of Huangpu Bridge on the Pearl River [J]. Zhongwai Highway, 2009, 29(1): 123-125;

[9] GB/T 5224-2003 Prestressed Concrete Steel Strand [S];

[10] GB/T 12347-1996 Steel wire rope bending fatigue test method [S].

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a cable span crane that is easy to use and install, low in cost, safe and reliable, and capable of hoisting objects with large deflection angles and large deflection angles.

The purpose of the present invention is achieved through the following technical solutions:

A cable span crane for hoisting at a large deflection angle, including a beam, an end beam, a hinge seat, a lifting system, a walking system, an anchoring system and an auxiliary lifting system, the beam is divided into a middle section of the beam and a side section of the beam, and the The side section of the crossbeam includes an upper beam and a lower beam, and the lower beam is fixedly connected with two cross-links. The upper beam is consolidated and hinged on the base through pin shafts. The hoisting system includes hoisting hoist, hoisting wire rope, fixed pulley block, movable pulley block and spreader. The auxiliary hoisting system includes auxiliary hoisting machine and auxiliary Steel wire rope, the main shaft of the fixed pulley block is fixed between the two cross-links, the movable pulley block is arranged under the fixed pulley block, the sling is connected under the movable pulley block, and one end of the lifting wire rope is directly connected to the The lifting hoist is connected, and the other end is anchored on the lower beam by bypassing the fixed pulley block and the movable pulley block in turn. One end of the auxiliary wire rope is connected to the auxiliary hoist, and the other end is installed on the movable pulley block Or on the hoisting beam section directly or indirectly connected with the moving pulley block.

As an improvement of the present invention, the crossbeam includes two crossbeam side sections and two crossbeam middle sections, the crossbeam middle sections are hinged to the crossbeam side sections, and the two crossbeam middle sections are hinged.

As another improvement of the present invention, the hoisting hoist is installed on the top of the cable tower.

Owing to adopting above-mentioned mode, the present invention has following advantage:

(1) The beam includes two beam side sections and two beam middle sections, each section is hinged, and the middle section can be adapted to a suspension bridge with different main cable spacing after appropriate modification;

(2) The fixed pulley block is located between the two cross-links of the lower beam at the side section of the beam, that is, at the bottom of the beam, and the movable pulley block is placed under the fixed pulley block. When hoisting at an off-angle, the lifting wire rope will not interfere with the beam. Collision, so the movable pulley block can be offset by a large angle relative to the beam;

(3) The end of the lifting wire rope is directly fixed on the chord of the lower beam of the side section of the beam. When hoisting at a deflection angle, the lifting wire rope will not collide with the beam, so the movable pulley block can be offset by a larger angle relative to the beam;

(4) The cantilever beam of the hinge seat and the upper beam of the side section of the cross beam are consolidated into a whole, which is hinged on the base of the hinge seat through the pin shaft of the hinge seat, and can rotate around the center line of the hinge seat pin shaft. When hoisting at an off-angle, when the hoisting angle is large, the beam can be rotated by a certain angle around the center line of the pin axis of the hinge seat to increase the overall hoisting angle;

(5) The lifting hoist is placed on the top of the cable tower. Compared with placing it on the ground, it can shorten the length of the hoisting wire rope on the one hand, and on the other hand, maintain a certain elevation angle at which the hoisting wire rope enters the fixed pulley block to prevent hoisting. The heavy wire rope hits the beam member;

(6) The auxiliary steel wire rope is connected with the movable pulley or the hoisting beam section. The auxiliary lifting system can provide auxiliary force. Combined with the function of the hoisting system, the hoisting beam section can be in a state of oblique hanging balance, so that the hoisting beam section can be lifted from a large deflection angle state. Reach the vertical state, and finally reach the design position.

In summary, the present invention, a cable-span crane hoisted at a large deflection angle, has the advantages of convenient installation, low cost, safety and reliability, and can lift objects with large deflection angles, and is suitable for the erection of suspension bridges in mountainous areas.

Description of drawings

Figure 1 is a front view of the present invention.

Figure 2 is a top view of the present invention.

Fig. 3 is a sectional view of the I-I plane of the present invention.

Fig. 4 is a sectional view of plane II-II of the present invention.

Fig. 5 is a state diagram of the first step of hoisting of the hoisting system and the auxiliary hoisting system during operation of the present invention.

Fig. 6 is a state diagram of the second step of hoisting of the hoisting system and the auxiliary hoisting system during operation of the present invention.

Fig. 7 is a state diagram of the third step of hoisting of the hoisting system and the auxiliary hoisting system during operation of the present invention.

Fig. 8 is a status diagram of the fourth step of hoisting of the hoisting system and the auxiliary hoisting system during operation of the present invention.

Fig. 9 is an overall diagram of installation and use of the present invention.

In the accompanying drawings 1-9: 1---the middle section of the beam, 2---the side section of the beam, 3---the pin shaft of the beam, 4---the upper beam, 5---the lower beam, 6---cross connection , 7---middle section of end beam, 8---side section of end beam, 9---walking wheel, 10---hoop, 11---guide wheel, 12---base, 13---pick Beam, 14---hinge seat pin, 15---lifting hoist, 16---lifting wire rope, 17---fixed pulley block, 18---moving pulley block, 19---sling, 20- --Walking winch, 21---Walking wire rope, 22---Backing block, 23---Limiting block, 24---Auxiliary winch, 25---Auxiliary wire rope, 26---Main cable, 27---cable clip, 28---hoisting beam section, 29---cable tower.

Detailed ways

The specific implementation of the cross-cable crane hoisted at a large deflection angle will be described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 9, a cable-span crane hoisted at a large deflection angle includes a beam, an end beam, a hinge seat, a lifting system, a walking system, an anchoring system, and an auxiliary lifting system. The beam includes two A crossbeam middle section 1, two crossbeam side sections 2 and several crossbeam pin shafts 3, the crossbeam side section 2 and the crossbeam middle section 1, and the two crossbeam middle sections 1 are hinged and connected as a whole through the crossbeam pin shafts 3; The beam side section 2 includes an upper beam 4 and a lower beam 5, two cross-links 6 are fixedly connected to the lower beam 5, and the end beam is divided into an end beam middle section 7 and two end beam side sections 8, The middle section 7 of the end beam is equipped with a walking wheel 9, and the side section 8 of the end beam is equipped with a hoop 10, a walking wheel 9 and a guide wheel 11; the hinge seat includes a base 12, a beam 13 and a hinge pin 14 , the base 12 is fixed above the middle section 7 of the end beam, the cantilever beam 13 is fixedly connected with the upper beam 4 of the beam side section 2, and the hinge seat pin 14 is used between the cantilever beam 13 and the base 12 Articulated connection; the hoisting system includes a lifting hoist 15, a hoisting wire rope 16, a fixed pulley block 17, a movable pulley block 18, and a spreader 19; the hoisting hoist 15 is placed on the top of the cable tower 29 of the suspension bridge; The main shaft of 17 is fixed on the two cross-links 6; the movable pulley block 18 is arranged under the fixed pulley block 17; the spreader 19 is connected under the movable pulley block 18; Hoist 15, the other end of which goes around the fixed pulley block 17 and the movable pulley block 18 in turn and is anchored on the lower beam 5, and pulls and releases the hoisting wire rope 16 through the hoisting hoist 15 to realize the luffing of the spreader 19; the traveling system Including walking winch 20, walking wire rope 21, guide wheel 11 and walking wheel 9; Walking winch 20 is also placed on the top of cable tower 29, one end of walking wire rope 21 is connected to the walking winch 20, and the other end is connected to the end beam; The guide wheel 11 is connected to the side section 8 of the end beam and attached to both sides of the main cable 26; the traveling wheel 9 is connected to the bottom of the end beam and placed above the main cable 26; the anchoring system includes a hoop 10 and a supporting pad 22 , Limit pad 23; The hoop 10 is connected to the end beam side section 8, the support pad 22 is placed between the end beam middle section 7 and the main cable 26, and the limit pad 23 is placed in the end beam middle section 7 and the cable clamp 27; when hoisting heavy objects across the cable crane, clamp the hoop 10, tighten the support pad 22 and the limit pad 23, so that the end beam is fixed on the main cable 26 When walking across the cable crane, loosen the hoop 10, remove the support pad 22 and the limit pad 23, so that the end beam can move on the main cable 26; the auxiliary lifting system includes Auxiliary hoist 24, auxiliary wire rope 25; the auxiliary hoist 24 is fixed on the ground or the top surface of the assembled beam section; one end of the auxiliary hoist 25 is connected to the auxiliary hoist 24, and the other end is connected to the moving pulley block 18 or the hoisting beam section 28. The connection method between the auxiliary steel wire rope 25 and the movable pulley block 18 or the hoisting beam section 28 can be selected according to the stress on the auxiliary steel wire rope 25 .

The specific implementation is as follows:

1. Utilize the cable tower 29 to assemble the cross-cable crane on the main cable 26 near the top of the tower; after the assembly is completed, the auxiliary wire rope 25 of the auxiliary winch 24 is also connected to the movable pulley block 18 at the same time;

2. Loosen the hoop 10, remove the support block 22 and the limit block 23, and use the traveling hoist 20 and the traveling wire rope 21 to pull the end beam to a suitable position;

3. As shown in Figure 3, reach the proper position, clamp the hoop 10, place a support pad 22 between the middle section of the end beam 7 and the main cable 26, and set a limit between the middle section 7 of the end beam and the cable clamp 27 Spacer 23, ready for hoisting;

4. As shown in Figure 5, lower the hoisting sling 19, and apply force with the help of the auxiliary hoist 24, so that the sling 19 reaches the position of the hoisting beam section 28, and then connect the hoisting beam section 28 to the sling 19;

5. As shown in Figure 6, slowly start the hoisting hoist 15 and the auxiliary hoist 24 at the same time until the hoisting wire rope 16 and the auxiliary wire rope 25 are in tension;

6. As shown in Figure 7, start the hoisting hoist 15 slowly, and at the same time, the auxiliary hoist 24 drags the hoisting beam section 28 and releases it slowly, so that the hoisting beam section 28 is hoisted smoothly and slowly to a vertical state;

7. As shown in Fig. 8, loosen the auxiliary wire rope 25, lift the hoisting beam section 28 to the design position with the hoist hoist 15 alone, and perform positioning.

8. Connect the precisely positioned hoisting beam section 28 to the assembled beam section, install the corresponding boom, and loosen the hoisting tool 19 from the hoisting beam section 28;

9. Repeat (2) to (8) until all hoisting tasks are completed.

Claims (3)

1. the lifting of big drift angle stride the cable loop wheel machine; Comprise crossbeam, end carriage, free bearing, tackling system, running gear, anchor system and auxiliary tackling system; Said crossbeam is divided into crossbeam stage casing (1) and cross beam edges section (2); Said cross beam edges section comprises upper beam (4) and underbeam (5); Said underbeam (5) is connected with two horizontal-associates (6), and said free bearing comprises base (12) and outrigger (13), and said base (12) is fixed on the said end carriage; Said outrigger (13) and the said beam consolidation and hinged on said base (12) of going up through bearing pin; Said tackling system comprises hoisting winding (15), hoist rope (16), fixed pulley group (17), running block (18) and suspender (19), and said auxiliary tackling system comprises auxiliary winch (24) and auxiliary steel rope (25), it is characterized in that: the main shaft of said fixed pulley group (17) is fixed between two said horizontal-associates (6); Said running block (18) is arranged on said fixed pulley group (17) below; Said suspender (19) is connected running block (18) below, and an end of said hoist rope (16) directly is connected with said hoisting winding (15), and the other end walks around said fixed pulley group (17) successively and said running block (18) is anchored on the said underbeam (5); One end of said auxiliary steel rope (25) connects said auxiliary winch (24), and the other end is installed in said running block (18) and upward or with the direct or indirect bonded assembly of said running block (18) lifts on the beam section (28).

2. big drift angle according to claim 1 lifting stride the cable loop wheel machine, it is characterized in that: said crossbeam comprises two cross beam edges sections (2) and two crossbeam stage casings (1), said crossbeam stage casing (1) and cross beam edges section (2) are hinged, two said crossbeam stage casings (1) are hinged.

3. big drift angle according to claim 1 lifting stride the cable loop wheel machine, it is characterized in that: said hoisting winding (15) is installed in the cat head of Sarasota (29).

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