CN106400701A - Single-girder low-level balanced cantilever assembling bridge erection machine - Google Patents

Abstract

The name of the present invention is a single girder low-position balanced cantilever assembled bridge erecting machine. The invention belongs to the technical field of prefabricated segment balanced cantilever assembled bridge erection. It mainly solves the problems of heavy deadweight and high height existing in existing bridge erecting machines. Its main features are: including main girder, front hoisting crown block, rear hoisting crown block, front main outrigger, middle main outrigger, rear main outrigger, segmental hoisting beam and tensioning platform, the main beam is single Rectangular frame structure, the upper part of the main girder is provided with a crane track, and the lower chord of the main girder is provided with a stainless steel track; The span beam, the crown span beam is seated on the crown rail of the main girder, and the upper parts of the two independent winch systems are fixed at both ends of the crown span girder. The invention has the characteristics of simple structure, easy operation and simple construction process, and is mainly used in the case where the design of the permanent structure requires that the bridge erecting machine has a small force on the permanent structure and must pass through the height limit.

Description

A single girder low position balanced cantilever assembled bridge erecting machine

technical field

The invention belongs to the technical field of prefabricated section balanced cantilever assembled bridge erection. In particular, it relates to a safe, light, simple and practical novel single girder low-position balanced cantilever assembled bridge erecting machine.

Background technique

Segmental prefabricated assembly technology has been widely used in urban bridge construction at home and abroad because of its good economic and social benefits. As a prefabricated segment assembly technology, balanced cantilever assembly is widely used in long-span bridge construction. In terms of construction, balanced cantilever assembly generally includes automobile hanger beams, bridge deck crane frame beams, and bridge erection frame beams. Among them, the bridge frame girder is widely used by construction units due to its high construction efficiency, safe operation, small construction area requirements, and low construction cost. It is the most common balanced cantilever assembly construction method.

A project uses a bridge erecting machine for prefabricated segmental balanced cantilever assembly construction. It is required that the supporting reaction force of the bridge erecting machine on the cover beam and pier column shall not exceed 2500kN, and the bridge erecting machine needs to pass through a portal structure with a height limit of 5.7m. The first pair of segments on both sides of the pier column cap beam and the pier column cap beam are connected using wet joints. At present, the balanced cantilever bridge erecting machines in China all adopt the double main girder structure, which has a large dead weight and cannot meet the requirements of the construction support and reaction force; and in order to meet the construction needs of the double main girder bridge erecting machines, the height of the outriggers is too large to meet the limit high demand.

Contents of the invention

The present invention designs a single girder light-duty low-position balanced cantilever assembled bridge erecting machine for the above project requirements. The bridge erecting machine adopts single main girder structure and optimized design, and the structure is light in weight. The design of the outrigger structure is low, and the hoisting crane used for lifting the section adopts a straddle design, which further reduces the overall height of the bridge erecting machine and ensures that the bridge erecting machine passes through the height-limited portal structure.

The technical solution of the present invention is: a single main girder low-position balanced cantilever assembled bridge erecting machine, including the main girder, the front crane crane, the rear crane crane, the front main leg, the middle main leg, and the rear main support Legs, segmental suspension beams and tensioning platforms are characterized in that: the main beam is a single rectangular frame structure, which is the most important supporting part of the bridge erecting machine. The stainless steel track is used for the main leg to push the main girder through the hole; the structure of the front hoisting crane and the rear hoisting crane are the same, including two independent hoist systems and the bridge spanning beam of the crane. The beam straddles the crown rail of the main beam, and the upper parts of the two independent winch systems are fixed at both ends of the crown spanning the beam.

Both the front hoisting crane and the rear hoisting crane described in the technical solution of the present invention are provided with two independent hoist systems, and the hoist of one independent hoist system in the two hoist systems has a double-rope structure.

The hoisting machine of the hoist system of the front hoisting crown block and the rear hoisting crown block described in the technical solution of the present invention is provided with a traversing mechanism for segmental lateral direction adjustment; the front hoisting crown block and the rear hoisting crown block It is driven by a sprocket chain mechanism to move forward and backward on the main beam. The use of the double crown crane system has effectively improved the construction efficiency of the prefabricated segmental girder of the bridge erecting machine.

The main beam described in the technical solution of the present invention is composed of modules with the same structure, and each module is composed of a rectangular body frame and a main beam segment upper truss and a main beam segment fixed on the middle part of each frame bar of the rectangular body frame. The lower truss is composed of a working platform inside the main girder for workers to safely operate the bridge erecting machine; the side of the main girder is provided with a sign for displaying the moving distance of the main girder of the bridge erecting machine, which is convenient for observing the distance of the bridge erecting machine through the hole.

The structure of the front main support leg, the middle main support leg and the rear main support leg described in the technical solution of the present invention is the same, and its main function is to support the main beam of the bridge erecting machine and push the bridge erecting machine through the hole; the front main support leg , The middle main leg and the rear main leg are composed of a through-hole bracket including a through-hole cylinder and a clamping cylinder, an equalizing beam, a telescopic column, four telescopic cylinders, a rotating beam, a traversing frame, and a traversing slide rail; The beam is supported on the sliding plate of the equalizing beam through the stainless steel track. The sliding plate is made of nylon material to ensure that the friction between the sliding plate and the stainless steel track is small; the telescopic column is connected between the equalizing beam and the rotating beam to adjust the height of the main leg. Ensure that the main outrigger meets the height requirements of the bridge erecting machine through the hole or erecting the longitudinal slope; four telescopic cylinders are symmetrically fixed on the equalizing beam, and the principle of four-point force and three-point balance is adopted to jack up or lower the main beam. Height and other situations that require height adjustment; the rotating beam is set on the rotating platform of the traversing frame, and the setting of the rotating beam can make the upper and lower parts of the main leg rotate relative to each other so that the bridge erecting machine can erect curved beams; traversing The frame is installed on the traversing slide rail through the sliding beam, and the sliding oil cylinder is arranged on the sliding beam, so that the whole main leg can be moved laterally so as to ensure that the bridge erecting machine can erect the double track across the line.

The tensioning platform described in the technical solution of the present invention is connected with the prefabricated segment using a chain hoist; the end of the tensioning platform is provided with a positioning pin that can be fixed with the prefabricated segment. The tensioning platform is a working platform for section tensioning after the section is hoisted. It is installed on the ground and is hoisted to high altitude together with the section. Chain blocks and dowel pins prevent the tensioning platform from falling off the prefabricated segments, thus ensuring safety.

According to the construction process, a wet joint is provided between the first pair of segments and the cover beam, and the segment hanger is specially used to lift the first pair of segments to facilitate wet joint construction. There is a segmental beam adjustment device on it, which can adjust the segmental beam in the horizontal, vertical and height directions to make the segmental beam reach the design position.

The invention has the characteristics of simple structure, easy operation and convenient construction process. The present invention is mainly used in the case where the design of the permanent structure requires the bridge erecting machine to exert less force on the permanent structure and must pass through the height limit.

Description of drawings

Fig. 1 is a schematic diagram of the general structure diagram of the present invention.

Fig. 2 is a schematic cross-sectional view of the structure of the present invention.

Fig. 3 is a schematic diagram of the girder section of the present invention.

Fig. 4 is a side view of the girder segment of the present invention.

Fig. 5 is a schematic structural view of the main leg in the present invention.

Fig. 6 is a first schematic diagram of the beam erection of the present invention.

Fig. 7 is the second schematic diagram of the beam erection of the present invention.

FIG. 8 is a first schematic diagram of a via hole in the present invention.

Fig. 9 is a second schematic diagram of via holes in the present invention.

Fig. 10 is a third schematic diagram of via holes in the present invention.

Fig. 11 is a fourth schematic diagram of via holes in the present invention.

In the figure: 1-main beam, 2-front crane crane, 3-rear crane crane, 4-front main leg, 5-middle main leg, 6-rear main leg, 7-segment crane Beam, 8-tension platform, 9-upper truss of main beam section, 10-lower truss of main beam section, 11-working platform, 12-sign, 13-through-hole support, 14-balanced beam, 15-telescopic cylinder , 16-telescopic column, 17-swivel beam, 18-transverse frame, 19-transverse slide rail.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 shows the component composition of the present invention: main beam 1, front hoisting crane 2, rear hoisting crane 3, front main outrigger 4, middle main outrigger 5, rear main outrigger 6, segment hanger 7 and tensegrity platform8.

As shown in Figure 2, the front crane 2 and the rear crane 3 have the same structure, both including two independent hoist systems and the bridge beam, and adopt the design principle of four-point lifting and three-point balance. The crown spanning beam is seated on the crown rail of the main girder 1, and the upper parts of the two independent winch systems are fixed at both ends of the crown spanning beam. The front crane 2 and the rear crane 3 adopt a straddle structure, and the hoist layout adopts a sunken structure, which further reduces the height of the bridge erecting machine. The overall height of the bridge erecting machine meets the height limit of the portal structure. Require. The hoist of an independent hoist system in the two independent hoist systems of the front hoisting crown 2 and the rear hoisting crown 3 is a double-rope winding structure. The hoist system of the front hoisting crane 2 and the rear hoisting crane 3 is equipped with a traversing mechanism for segmental lateral adjustment; the front hoisting crane 2 and the rear hoisting crane 3 are driven by sprocket chains Moving on the main girder 1, the double crown crane system is used to make it move on the main girder 1, which effectively improves the construction efficiency of the prefabricated segmental girder of the bridge erecting machine.

Figure 3 and Figure 4 show the typical structure of the main girder 1 of the bridge erecting machine. The main girder 1 is a single rectangular frame structure, which is the most important supporting part of the bridge erecting machine. The upper part of the main girder 1 is provided with a crane track, and the lower chord of the main girder 1 is provided with a stainless steel track, which is used for the main legs to push the main girder through the hole. The main beam 1 has a total length of 100m and is composed of nine modules with the same structure. Each module consists of a rectangular frame and a main beam segment upper truss 9 and a main beam segment lower truss 10 fixed on the middle of each rod of the rectangular frame. Composed, stacked together to form a complete module. The upper and lower frames, chords, vertical and horizontal rods, diagonal braces and diagonal braces are all welded together. The top and bottom frames are spliced together and connected at the joints with vertical rods, diagonal braces and diagonal braces. Each connection stack is secured with four bolts and two Ø45mm pins. The chords of the adjacent modules of the main girder are correspondingly spliced. The connection part is fixed with four Ø52 special bolts and a Ø40 pin. A working platform 11 is arranged inside the main girder 1 for workers to safely operate the bridge erecting machine. The side of the main girder 1 is provided with a sign 12 for displaying the moving distance of the main girder of the bridge erecting machine, which is convenient for observing the distance of the bridge erecting machine through the hole.

The structural characteristics of the main leg are further described in conjunction with FIG. 5 . The front main support leg 4, the middle main support leg 5 and the rear main support leg 6 have the same structure, and their main function is to support the main girder of the bridge erecting machine and push the bridge erecting machine through the hole. The middle main support leg 5 is made up of a through-hole support 13, an equalizing beam 14, a telescopic column 16, four telescopic oil cylinders 15, a rotating beam 17, a traversing frame 18, and a traversing slide rail 19. The through-hole support 13 includes a through-hole oil cylinder and a clamping oil cylinder. The working principle of the through-hole support 13 is as follows: the lower flange of the lower chord of the main beam is clamped by the clamping oil cylinder, and the main beam can be pushed forward by the through-hole oil cylinder; After the through-hole cylinder travels to the maximum position, the clamping cylinder is released, the through-hole cylinder is recovered to the position of the minimum stroke, and the clamping cylinder is clamped again, so that the continuous forward movement of the main beam can be realized by reciprocating in this way. The main beam 1 is supported on the slide plate of the equalizing beam 14 by the stainless steel track, and the slide plate is a slide plate made of special nylon material, so that the friction between the slide plate and the stainless steel track is small. The equalizing beam 14 is used to balance the stress of the main legs, and the slide plate can reduce the coefficient of friction between the main beam and the main legs. Four telescopic oil cylinders 15 are symmetrically fixed on the equalizing beam 14, adopting the principle of four-point stress and three-point balance, and are used for jacking up or lowering the height of the main beam 1 and other situations that require height adjustment. The telescopic column 16 is connected between the equalizing beam 14 and the rotating beam 17. The pads on the telescopic column 16 are used to fix the height of the main outrigger after the telescopic oil cylinder is adjusted in place, so as to ensure that the main outrigger meets the requirements of the bridge erecting machine through the hole or erection longitudinal Outrigger height requirements for slopes. The rotating beam 17 is arranged on the rotating platform of the traversing frame 18, and the rotating beam 17 can be pushed to rotate between the traversing frames 18 through the oil cylinder, so as to realize the rotation to erect the curved beam. The traversing frame 18 is installed on the traversing slide rail 19 through the sliding beam, and the sliding beam is provided with a sliding oil cylinder, so that the whole main leg can be moved laterally to ensure that the bridge erecting machine can erect double lines across the line.

The tensioning platform 8 is connected with the prefabricated segment through a chain hoist; the end of the tensioning platform 8 is provided with a positioning pin which can be fixed with the prefabricated segment. The stretching platform 8 is a working platform for section tensioning after the section is hoisted. It is installed when the prefabricated section is still on the ground, and is hoisted to high altitude together with the section. Chain blocks and positioning pins can prevent the tensioning platform 8 from falling off the prefabricated section.

Figures 6 to 7 are schematic diagrams of beam erection of the bridge erecting machine, which are explained as follows.

Figure 6 shows that after the bridge erecting machine is in place, the front crane 2 and the rear crane 3 cooperate with the segment suspension beams to complete the hoisting of the first pair of segments, and then construct the wet joint between the first pair of segments and the cover beam. Seam and carry out tensioning using tensioning platform 8. After the first pair of sections is completed, the front crane 2 and the rear crane 3 move to the P+1 pier and P-1 pier respectively for a distance of one section width, and hoist the second pair of sections .

Fig. 7 shows that the bridge erecting machine sequentially uses the front crane 2 and the rear crane 3 to construct the third to sixth pairs of segments.

After the bridge erecting machine completes the construction of the segmental beam of the previous span, it starts to pass through the hole to erect the next span. The specific construction steps are shown in Figure 8 to Figure 11, and are described as follows.

According to Fig. 8, firstly, the front crane 2 and the rear crane 3 run to the counterweight above the P+1 pier column in front of the bridge erecting machine.

As shown in Figure 9, under the push of the through-hole oil cylinder of the middle main leg 5, the main beam 1 moves forward until the center of the main beam reaches the center of the pier column P+1 and the pier column P, and the specific moving distance of the main beam can be It is determined by the sign 12 on the main beam 1.

As shown in FIG. 10 , after the steps shown in FIG. 9 are completed, the front hoisting crown 2 and the rear hoisting crown 3 move backward to the counterweight above the pier P. Afterwards, the telescopic oil cylinder 15 and the telescopic column 16 of the middle main leg lower the height of the middle main leg, so that the rear end of the main girder 1 of the bridge erecting machine is lowered, and the front end is tilted.

As shown in Figure 11, the main legs on the pier column P-1 are transported back to the pier column P+2 by using a crane and a transport vehicle in advance. The through-hole support 13 on the main leg 5 in the continuous drive makes the main girder 1 of the bridge erecting machine continue to move forward until the main girder 1 of the bridge erecting machine reaches the designated position. Adjust the height of the main middle outrigger 5 of the bridge erecting machine to make the main girder 1 of the bridge erecting machine level. The front hoisting crane 2 and the rear hoisting crane 3 run to the P+1 pier column, and the bridge erecting machine passes through the hole and starts erecting a new span prefabricated segment.

The above is only an exemplary description of the present invention, and the specific implementation manner of the present invention is not limited thereto. Any insubstantial modification made by adopting the conception and technical solutions of the present invention falls within the protection scope of the present invention.

Claims (6)

1. A single main girder low-position balanced cantilever assembled bridge erecting machine, including the main girder (1), the front crane crane (2), the rear crane crane (3), the front main leg (4), the middle main Outriggers (5), rear main outriggers (6), segmental suspension beams (7) and tensioning platforms (8), are characterized in that: the main beam (1) is a single rectangular frame structure, which is a bridge The most important support part of the machine, the upper part of the main beam (1) is provided with a crane rail, and the lower chord of the main beam (1) is provided with a stainless steel rail; the front crane crane (2), the rear crane crane (3) The structure is the same, including two independent winch systems and the spanning beam of the crane. across both ends of the beam. 2. A single-girder low-position balanced cantilever assembled bridge erecting machine according to claim 1, characterized in that: the front lifting crane (2) and the rear lifting crane (3) are both provided with two Independent hoist system, one of the two independent hoist systems The hoist of the independent hoist system is a double-rope structure. 3. A single girder low-position balanced cantilever assembled bridge erecting machine according to claim 1 or 2, characterized in that: the hoists of the front crane (2) and the rear crane (3) The winch of the system is equipped with a traverse mechanism for the adjustment of the transverse direction of the segment. 4. A single main girder low-position balanced cantilever assembled bridge erecting machine according to claim 1 or 2, characterized in that: the main girder (1) is composed of modules with the same structure, and each module is composed of a rectangular body The frame and the upper truss (9) of the main beam section and the lower truss (10) of the main beam section fixed on the middle part of each frame bar of the rectangular body frame; the main beam (1) is equipped with a working platform (11); the main beam ( 1) There is a sign (12) on the side for displaying the moving distance of the main girder of the bridge erecting machine. 5. A single girder low-position balanced cantilever assembled bridge erecting machine according to claim 1 or 2, characterized in that: the front main outrigger (4), the middle main outrigger (5) and the rear main outrigger The legs (6) have the same structure; the front main leg (4), the middle main leg (5) and the rear main leg (6) are all composed of a through-hole bracket (13) including a through-hole oil cylinder and a clamping oil cylinder, balanced Beam (14), telescopic column (16), four telescopic oil cylinders (15), rotating beam (17), traversing frame (18), and traversing slide rail (19); the main beam (1) is supported by stainless steel rails On the sliding plate of the equalizing beam (14), the sliding plate is a special nylon sliding plate; the telescopic column (16) is connected between the equalizing beam (14) and the rotating beam (17); four telescopic oil cylinders (15) are symmetrically fixed on the equalizing The beam (14); the rotating beam (17) is set on the rotating platform of the traversing frame (18); the traversing frame (18) is mounted on the traversing slide rail (19) through the sliding beam, and the Slide cylinder. 6. A single-girder low-position balanced cantilever assembled bridge erecting machine according to claim 1 or 2, characterized in that: said tensioning platform (8) is respectively provided with a hand that can be connected with the main girder (1). Chain hoists and hand chain hoists that can be connected with prefabricated segments; positioning pins that can be fixed with prefabricated segments are provided at the end of the tensioning platform (8).