CN105484166A - Ladder-shaped mast type cantilever assembling crane - Google Patents

Abstract

The invention provides a ladder-type mast-type suspension crane, which includes a frame structure, a traveling system, a hoist, a crown block system, a rotating hook group, a spreader distribution system, an electrical system, a hydraulic system, a steel wire rope, and an anchor for the first hoisting section. System, precision-rolled rebar and general anchoring system for hanging sections. The frame structure is mainly composed of upper main beam, upper beam, lower main beam, lower beam, front inclined bar, middle inclined bar, rear inclined bar and hoist platform. The outriggers on both sides of the cantilever bridge erecting machine need to be in the two "U" beams of the double "U" beam structure, and the frame structure of the bridge machine needs to span the middle evacuation platform. The running system is mainly connected by the front sliding shoe Support, front sliding shoe, rear sliding shoe connecting support, rear sliding shoe, jacking outrigger, walking oil cylinder seat and track; Compared with the prior art, the present invention has the following beneficial effects: easy to operate, applicability Strong, high beam erection efficiency, and has the convenience of turnover installation and disassembly, and low turnover cost.

Description

A ladder type mast type suspension crane

technical field

The invention relates to a ladder-type mast type suspension crane, which belongs to the technical field of bridging machinery.

Background technique

The elevated section of Shanghai Rail Transit Line 17 contains 20 prefabricated segmentally assembled continuous girder bridges. The segmental girders are U-shaped and box-shaped with variable cross-sections, and the length of each segment is 2.5 to 3.5 meters. This project has a total of 20 segmental cantilevered continuous U-shaped girder bridges. The middle spans are divided into three types: 50m, 55m, and 70m. Applicability and safety have high requirements.

The 20 bridges are all double U-shaped variable cross-section continuous beam structures, and they are all located on different horizontal and vertical curves. Due to the short-line method of construction, each prefabricated segment is controlled by the fixed end formwork. Compared with the traditional Closed box structure, double "U" beam open structure end mold precision is difficult to control. The fine adjustment of the suspension is difficult: double "U" girder plus box girder structure has many inflection points in the height direction of the section, and the girder height changes greatly along the bridge direction. , The coordinate accuracy of 6 points should be controlled within 2mm.

Contents of the invention

In view of the deficiencies in the prior art, the object of the present invention is to provide a ladder-type mast-type suspension crane to solve the problems raised in the above-mentioned background technology. The present invention is easy to use, easy to operate, good in stability and high in reliability.

In order to achieve the above object, the present invention is achieved through the following technical solutions: a ladder-type mast-type suspension crane, including a frame structure, a running system, a hoist, a crane system, a rotating hook group, and a spreader distribution system , electrical system, hydraulic system, steel wire rope, anchoring system of the first lifting section, precision-rolled rebar and general anchoring system, the frame structure is mainly composed of upper main beam, upper beam, lower main beam, lower beam, front inclined bar , middle inclined bar, rear inclined bar and hoist platform, the outriggers on both sides of the cantilevered bridge erecting machine must be in the two "U" beams of the double "U" beam structure, and the bridge machine frame structure must span the middle The evacuation platform, the walking system is mainly composed of the front sliding shoe connecting support, the front sliding shoe, the rear sliding shoe connecting support, the rear sliding shoe, the jacking legs, the walking cylinder seat and the track, and the walking system adopts the walking type walking and the stroke of the oil cylinder is 600mm. The crane system is mainly composed of fixed pulley wheel box, beam system and guide wheel system. The rotating hook group is composed of movable pulley wheel box, suspension upper beam, suspension lower beam and The boom system is composed of a bolted structure, and a thrust self-aligning bearing is placed in the middle to realize the rotation of the hook. The two ends of the hook are bolted and fixed with nuts. Ⅰ. Pull plate, C-shaped frame Ⅱ, distribution beam Ⅱ and precision-rolled rebar anchorage. A transverse oil cylinder is installed on the distribution beam Ⅰ. The stroke of the transverse oil cylinder is 600mm. A longitudinal oil cylinder is installed on the distribution beam Ⅱ. , the stroke of the vertically moving oil cylinder is 200mm, and the vertical and horizontal fine-tuning of the beam section can be realized by adjusting the vertically and horizontally moving oil cylinder. A hydraulic system is provided on one side of the hydraulic system, and a crane system is provided on one side of the hydraulic system. The bottom of the crane system is connected to the rotating hook group through steel wires. The bottom of the rebar is equipped with an anchor system for the first hoisting section, and one side of the anchoring system for the first hoisting section is equipped with an anchoring system for the general hoisting section.

Further, the frame structure of the hanging crane adopts a "ladder type" mast form, and the front diagonal rod, middle diagonal rod and rear diagonal rod are box-shaped beam structures.

Further, the main materials of the fixed pulley block wheel box, the beam system and the guide wheel system are composed of section steel and some steel plates.

Further, the longitudinal position of the crown block can be adjusted through the vertical movement cylinder fixed on the upper main girder. The stroke of the longitudinal movement cylinder is 1200mm. The stroke of the oil cylinder is 200mm.

Further, the hoist model is JM12.

Further, the electrical system is uniformly controlled by a programmable controller PLC.

Further, the hydraulic system includes two hydraulic pump stations, in which two traveling cylinders, two crane longitudinal cylinders and two crane traverse cylinders share one hydraulic pump station; one spreader traverse cylinder and two The vertical movement oil cylinders of the spreader share another hydraulic pump station, and the oil cylinders are all controlled by electromagnetic reversing valves.

Beneficial effects of the present invention: a ladder-type mast type suspension crane of the present invention has the advantages of simple operation, strong applicability, high beam erecting efficiency, convenient installation and disassembly, and low turnover cost.

(1) The slewing hook can meet the different positioning requirements of large beam trucks under different site conditions. The boom system is set as a bolted structure, and a thrust self-aligning bearing is added in the middle to realize the 360-degree rotation of the hook. At the same time, there is a locking device between the suspended upper beam and the suspended lower beam. After the beam section is hoisted and rotated in place, the locking bolt between the suspended upper beam and the suspended lower beam is installed to limit the rotation of the hook and prevent the beam section from being lifted. After the beam section is lifted into place, the locking bolt can be removed to restore the rotation function of the hook group.

(2) The "ladder type" mast form adopted by the suspension crane makes the present invention overcome the bridging problem caused by the double "U" beam structure.

(3) The structure is simple, the overall weight is light, and the temporary structural bending moment generated at the main pier during cantilever construction is small, which is conducive to structural safety.

(4) The main truss of the suspension crane is relatively small in size and light in weight. The truss can be dismantled, transported and installed in a short distance, which reduces the time for conventional technical transfer removal and reinstallation acceptance, and is convenient for the bridge erecting machine to quickly Transition, assembly.

(5) The suspension crane has the function of all-round precise attitude adjustment, which is convenient for attitude adjustment and takes a short time for adjustment. Add 6 moving oil cylinders to the crane and the spreader (the crane is equipped with two longitudinal movement cylinders with a stroke of 1200mm and one translation cylinder with a stroke of 200mm; the spreader is equipped with two longitudinal movement cylinders of 200mm and a translation cylinder of 600mm ), realize the translation of three axial directions and the rotation of two axial directions of the segmental beam in the air, and achieve the purpose of 360-degree precise attitude adjustment. According to actual field tests, the precise attitude adjustment of a U-beam from hoisting to positioning can be completed in half an hour.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is the structural representation of a kind of trapezoidal mast type suspension splicing crane of the present invention;

Fig. 2 is a schematic structural view of the hydraulic system of a ladder-type mast type suspension crane of the present invention;

In the figure: 1 frame structure, 2 traveling system, 3 hoist, 4 crown crane system, 5 rotating hook group, 6 spreader distribution system, 7 hydraulic system, 8 electrical system, 9 steel wire rope, 10 anchoring system of first lifting section, 11 Finish-rolled rebar, 12 Anchorage system for general lifting section.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

Please refer to Figures 1-2, the present invention provides a technical solution: a ladder-type mast-type suspension crane, including a frame structure 1, a running system 2, a hoist 3, a crane system 4, a rotating hook group 5, Spreader distribution system 6, electrical system 7, hydraulic system 8, steel wire rope 9, anchoring system 10 of the first lifting section, finished-rolled rebar 11 and anchoring system 12 of general lifting section, the frame structure 1 is mainly composed of the upper main beam, the upper The beam, the lower main beam, the lower beam, the front slant bar, the middle slant bar, the rear slant bar and the winch platform are composed. "In the beam, the frame structure of the bridge crane needs to cross the middle evacuation platform. The traveling system 2 is mainly composed of front sliding shoe connecting support, front sliding shoe, rear sliding shoe connecting support, rear sliding shoe, jacking outrigger, walking Composed of oil cylinder base and track, the walking system 2 adopts walking and the stroke of the oil cylinder is 600mm. The crown block system 4 is mainly composed of three parts: the fixed pulley wheel box, the beam system and the guide wheel system. The rotating hook Group 5 consists of movable pulley wheel box, suspension upper beam, suspension lower beam and suspender system, in which the suspender system is a bolted structure, and a thrust self-aligning bearing is added in the middle to realize the rotation of the hook, and the two ends of the hook are bolted with nuts fixed, the spreader distribution system 6 is composed of C-shaped frame I, distribution beam I, pull plate, C-shaped frame II, distribution beam II and finished-rolled threaded steel anchorage, and the horizontal movement cylinder is set on the distribution beam I. The stroke of the oil cylinder is 600mm, and there is a vertical oil cylinder on the distribution beam II. System 2, the top of the running system 2 is provided with a hoist 3, the side of the hoist 3 is provided with a hydraulic system 8, the side of the hydraulic system 8 is provided with a crane system 4, and the bottom of the crane system 4 passes through a wire rope 9 Connected with the rotary hook group 5, the electrical system 7 is arranged on the top of the finished-rolled rebar 11, and the bottom of the finished-rolled rebar 11 is provided with an anchoring system 10 for the first lifting section, and one side of the anchoring system 10 for the first lifting section A general hanging section anchoring system 12 is provided.

The frame structure 1 of the suspension crane adopts the form of a "ladder type" mast, the front slant, the middle slant and the rear slant are box-shaped beam structures, and the fixed pulley wheel box, beam system and guide wheels The main material of the system is composed of section steel and some steel plates. The longitudinal position of the crown block can be adjusted through the longitudinal movement cylinder fixed on the upper main beam. The stroke of the longitudinal movement cylinder is 1200mm. The lateral position of the wheel box, the stroke of the traversing oil cylinder is 200mm, the model of the hoist 3 is JM12, the electrical system 7 is uniformly controlled by the programmable controller PLC, and the hydraulic system 8 includes two hydraulic pump stations, two of which are One traveling oil cylinder, two crane longitudinal moving oil cylinders and two crane transverse moving oil cylinders share one hydraulic pump station; one spreader transverse moving oil cylinder and two spreader longitudinal moving oil cylinders share another hydraulic pump station and the oil cylinders are all used Electromagnetic reversing valve controls expansion and contraction.

When using the cantilever crane for cantilever assembly and erection during work, the segmental beams are first transported to the construction site with a beam transporter, and each segmental beam is hoisted in turn. The hoisting sequence is symmetrical hoisting from the middle to both ends. In the gluing process, the joint epoxy resin adhesive is first applied, and temporary prestress is applied after every two sections are completely butt-jointed, so that the sections are tightly combined under the action of prestress without leaving gaps, and permanent prestressed steel beams are worn. And carry out the tensioning of the permanent steel beams, and assemble them in sequence until all the segments are in place, and finally the bridge erecting machine unloads them. Carry out system replacement, cast-in-place side-span closing section and mid-span closing section in turn, and stretch and close the roof bundle to form a continuous beam.

1. Assembled by suspension crane, 25t truck crane is used for ground assembly.

2. Use a 150t truck crane to hoist the suspension crane to the T structure of block 0# in the middle pier, and consolidate the anchorage system.

3. Debugging and acceptance of electrical equipment.

4. The 1# suspension segment is transported to the designated position under the bridge by the beam transport vehicle (the projection position of the 1# segment under the bridge), after the segment beam is leveled, the spreader is lowered to the bridge, and the fine rolling thread is used to The steel connects the spreader and the segmental beam, and the anchor is firm, and it is lifted symmetrically by the two-sided suspension crane.

5. The 1# segmental beams are aligned and assembled, and the auxiliary suspenders are installed for fine-tuning and accurate alignment; the stiff skeleton is installed, and the prestressed pipes are installed; the wet joint hanger between the 0# segment and the 1# segment is erected, Install the formwork; pour the wet joint concrete, and after the strength reaches the requirement, carry out permanent prestressed tension, and carry out vacuum pipeline grouting within 24 hours.

6. The other sections of the cantilever assembly are constructed with dry joints. During the construction, the prefabricated beam sections are bonded into a whole with a solvent-free epoxy resin cement. It mainly plays the role of lubrication, Anchor, waterproof, transfer stress and other functions.

Suspension crane in place---lifting beam section (installation of temporary tensioning pedestal)---preliminary positioning trial assembly---checking and handling pipe joints---removing beam section (beam body staggered by 20cm, and falling ) --- Coating glue on the joint surface --- Lifting the beam section, sticking to the beam section --- Piercing the temporary prestressed tendon manhole --- Formal positioning --- Tensioning the temporary prestressed tendon --- Stress system conversion of the spreader (through the vertical finish-rolled rebar)---through the permanent prestressed tendon---equal strength, tensioned prestressed tendon, grouting---moving suspension and splicing crane---down Assembled in one beam segment.

7. After the assembly of the last segment is completed, lift the bridge erecting machine as a whole to the flatbed transport vehicle for transition.

8. Positioning and adjustment of segmental beams;

In order to ensure the accurate positioning of the segmental beams, the construction control coordinates are first converted according to the six-point coordinates provided by the prefabrication plant before the temporary tensioning, and the spatial position of the segmental beams is controlled according to the converted six-point coordinates using a level and a total station , to ensure the correct position of each segment beam in each hole. The segmental beam must be accurately positioned during installation and temporarily consolidated. The adjustment method of the segmental beam is as follows:

(1) Elevation control. The elevation control point of the segmental beam meets the design requirements through the winch unit.

(2) Mileage control. The segmental translational movement along the bridge direction is realized through the vertical movement oil cylinder of the crane, so that the mileage meets the design requirements.

(3) Axis control. Set axial control points on the completed bridge deck, and use a total station to check the axis of the segmental beam. If there is deviation, use the horizontal jack on the suspension beam to adjust the beam body to the correct position.

(4) Flatness control. Adjust the vertical and horizontal rotation of the segment to the design line shape requirements by adjusting the longitudinal and lateral movement cylinders of the spreader.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or fundamentals of the present invention. The present invention can be implemented in other specific forms without any specific features. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (7)

1. A ladder-type mast-type suspension crane, including a frame structure, a traveling system, a winch, a crane system, a rotating hook group, a spreader distribution system, an electrical system, a hydraulic system, a wire rope, and an anchor system for the first lifting section , fine-rolled rebar and general hanging section anchoring system, the frame structure is mainly composed of upper main beam, upper beam, lower main beam, lower beam, front inclined bar, middle inclined bar, rear inclined bar and hoist platform, the suspension The outriggers on both sides of the erecting bridge crane need to be in the two "U" beams of the double "U" beam structure, and the frame structure of the bridge crane needs to span the middle evacuation platform. seat, front sliding shoe, rear sliding shoe connecting support, rear sliding shoe, jacking outrigger, traveling oil cylinder seat and track, the walking system adopts walking type walking and the stroke of the oil cylinder is 600mm, and the crane system mainly consists of The fixed pulley block wheel box, the beam system and the guide wheel system are composed of three parts. The rotating hook group is composed of the movable pulley block wheel box, the suspension upper beam, the suspension lower beam and the boom system. The boom system is a bolted structure. A thrust self-aligning bearing is added in the middle to realize the rotation of the hook, and the two ends of the hook are bolted and fixed by nuts. The spreader distribution system consists of C-shaped frame Ⅰ, distribution beam Ⅰ, pull plate, C-shaped frame Ⅱ, distribution beam Ⅱ and It is composed of fine-rolled rebar anchorage. A horizontal movement cylinder is installed on the distribution beam I. The stroke of the horizontal movement cylinder is 600mm. A vertical movement cylinder is installed on the distribution beam II. The stroke of the vertical movement cylinder is 200mm. The vertical and horizontal fine-tuning of the beam section can be realized. The bottom of the frame structure is equipped with a running system, and the top of the running system is equipped with a hoist. One side of the hoist is equipped with a hydraulic system, and one side of the hydraulic system is equipped with a crane system. , the bottom of the crane system is connected to the rotary hook group through a wire rope, the electrical system is arranged on the top of the finished rolled rebar, and the bottom of the finished rebar is provided with an anchoring system for the first lifting section, and the first hanging section is anchored One side of the system is equipped with a general hanging section anchor system. 2. A ladder type mast type suspension crane according to claim 1, characterized in that: the frame structure of the suspension type crane adopts the form of a "ladder type" mast, and the front slope, center slope The rods and rear diagonals are of box girder construction. 3. A ladder-type mast suspension crane according to claim 1, characterized in that: the main materials of the fixed pulley wheel box, the beam system and the guide wheel system are composed of section steel and some steel plates. 4. A ladder-type mast suspension crane according to claim 1, characterized in that: the longitudinal position of the crown block can be adjusted through the longitudinal movement cylinder fixed on the upper main beam, and the stroke of the longitudinal movement cylinder is 1200mm , The lateral position of the wheel box can be adjusted through the traverse cylinder fixed on the beam system, and the stroke of the traverse cylinder is 200mm. 5. A ladder type mast type suspension crane according to claim 1, characterized in that: the model of the hoist is JM12. 6. A ladder-type mast type suspension crane according to claim 1, characterized in that: said electrical system is uniformly controlled by a programmable controller (PLC). 7. A ladder-type mast type suspension crane according to claim 1, characterized in that: said hydraulic system contains two hydraulic pump stations, wherein two traveling oil cylinders, two crane longitudinal moving oil cylinders and two One hydraulic pump station is used for the horizontal movement of the crane; one hydraulic cylinder for the horizontal movement of the spreader and two longitudinal movement cylinders for the spreader share another hydraulic pump station, and the expansion and contraction of the cylinders are all controlled by electromagnetic reversing valves.