CN100522793C - Installing method of portal crane - Google Patents

Abstract

An installation method of a gantry crane, in the process of overall lifting of a steel structure girder, rigid legs and flexible legs are lifted into place together with the lifting of the girder, realizing the one-time forming of the whole gantry crane, which is safe, fast and reliable. The main girder is spliced on site, and the trolley and maintenance crane are hoisted on the girder at the same time, and then the lifting tower is erected, and the girder is lifted by using advanced hydraulic synchronous lifting technology. The rigid legs are installed in sections, and the flexible leg structure is naturally in place with the lifting of the girder. After the girder is lifted in place, the installation of the two tube legs of the rigid leg walking mechanism and the flexible leg is completed, and finally the installation of the entire gantry crane structure is completed. The invention uses two pairs of lifting towers, the adjustment of the cable wind is reduced, and it is safe and reliable; the rigid legs and flexible legs are gradually in place with the lifting of the girder, which reduces the workload of separately installing the rigid legs and flexible legs; the lifting cylinder is used to stretch the tower The cable wind is installed, the force of the cable wind is accurate, and the adjustment is convenient.

Description

Installation method of gantry crane

technical field

The invention relates to a method for installing a gantry crane.

Background technique

Gantry cranes are mainly used in the shipbuilding industry, and they are currently installed in various ways. The general method is to erect the entire rigid leg first, and then lift the girder into place. This method is difficult to adjust the center of gravity of the rigid leg when the girder is installed, so the safety is poor. In the past, a major engineering accident occurred in a certain factory. big relationship.

Contents of the invention

The purpose of the present invention is to provide a new installation method to improve the safety, quickness and reliability of the installation process of the gantry crane.

In order to achieve the above-mentioned purpose, the present invention uses two pairs of "door"-shaped towers as lifting towers, the steel structure girders are assembled on the ground, and the rigid legs are segmented and the flexible legs are hinged on the girders. During the overall lifting of the steel structure girder, the rigid legs and flexible legs are lifted into place together with the lifting of the girder, realizing the one-time forming of the entire gantry crane, which is safe, fast and reliable.

The advantages of the present invention are as follows: firstly, two sets of hoisting towers are used, the adjustment of cable wind is reduced, and it is safe and reliable; The workload of the flexible legs; third, use the lifting cylinder to tension the cable wind of the tower, the force of the cable wind is accurate, and the adjustment is convenient.

Description of drawings

Figure 1 shows the layout of the lifting system of the gantry crane.

Figure 2 is the rigid leg installation diagram.

Figure 3 is an installation diagram of the flexible legs.

Detailed ways

The present invention will be further described in conjunction with the accompanying drawings. Please refer to Fig. 1, 2, and 3, the present invention consists of girder 1, rigid leg 2, first hinge point 3, slider 4, second hinge point 5, lifting cylinder 6, tower top gantry beam 7, tower frame 8 , walking mechanism 9, A prefix 10, the third hinge point 11, the fourth hinge point 12, the lower beam 13 of the flexible leg, the flexible leg 14 and the sliding trolley 15 etc. to form.

installation method:

1. Installation of the tower frame and the gantry beam on the top of the tower

The present invention uses two pairs of towers 8 as lifting towers. The effective height of the towers 8 varies according to the specific gantry cranes. Generally, it can be as high as more than 100 meters, with a section of 4 meters. The steel pipe lattice structure, the tower The bottom of the frame 8 is connected with the ground foundation using bolts. The gantry beam 7 on the top of the tower is a box structure. Each pair of towers has a load capacity of more than 2,000 tons. The distance between the centers of the two towers across the girder 1 of the gantry crane is more than ten meters. On the top of the two towers, there is a box-shaped gantry beam at the top of the tower, that is, a lifting beam. The lifting cylinder 6 is placed on the gantry beam 7 at the top of the tower. , as shown in Figure 2. After the tower frame 8 and the tower top gantry beam 7 are installed, use the theodolite to calibrate the verticality of the tower frame. After meeting the requirements, fix them with the cable wind rope, and use the chuck to clamp the live head of the cable wind rope.

2. Lifting of the girder

After the installation of the tower top gantry beam 7 of the tower frame 8 is completed, the lifting of the girder 1 starts. Lifting for the 1st time, the lifting height is determined according to specific conditions, and stops when about ten meters, load onto rigid leg 2 superstructure and flexible leg A word head 10, calibrate its horizontal position, and fix it. Before the second lift, use the second hinge point 5 to connect one end of the rigid leg 2 to the girder 1, and place the other end of the rigid leg 2 on two sliding trolleys 15. In this way, the rigid legs 2 are automatically in place as the girder 1 is lifted. Once in place, calibrate the axis and connect with electric welding. Simultaneously, before lifting for the second time, the flexible leg 14 is connected to the A-head 10 using the fourth hinge point 12, so that the crossbeam 1 is in place, and the flexible leg 14 is automatically in place.

3. Installation of rigid legs, see Figure 2. In the first step, the rigid leg 2 is placed at the predetermined position in sections, and the upper and lower positions of both ends are adjusted using a hydraulic jack, and the second hinge point 5 and the first hinge point 3 are connected. In the second step, the two rigid legs rise up with the lifting of the girder, and the other end is pulled by a hoist to overcome the horizontal friction. In the third step, the assembled walking mechanism 9 is slowly pushed under the rigid legs 2 . Finally, the girder 1 is lowered, and the joints at the sections are calibrated and welded.

Fourth, the installation of the flexible legs, see Figure 3. After the gantry suspension beam 1 is lifted for the first time, symmetrical fourth hinge points 12 are arranged on both sides of the lower end of the A-head 10 of the flexible leg, one on each side. In the first step, the flexible legs 14 are placed flat, and one end of the leg pipe is connected with the A-head 10 with the fourth hinge point 12, and the other end is connected with the running mechanism with the third hinge point 11. In the second step, the girder 1 is lifted, and the flexible legs 14 follow naturally. In the horizontal direction of the flexible leg walking mechanism, a horizontal traction force is applied to reduce the vertical lifting force. In the third step, the girder 1 is put in place, and the fracture of the flexible leg 14 is naturally closed.

Since the rigid legs of the present invention are lifted step by step, the problem of unstable center of gravity is well solved. In addition, the lifting cylinder is used to tension the cable wind of the tower, so that the force problem of the cable wind can be accurately adjusted and measured. After testing, the present invention has achieved great success in the application of two 600-ton * 182-meter gantry cranes in the overall lifting project. Therefore, this method has substantial characteristics and remarkable advancement.

Claims (1)

1, a kind of installation method of transfer crane, use two pairs " door " font pylon for promoting pylon, the steel structure crossbeam is made at installation on ground, segmentation of rigidity leg and flexible leg are hinged on the crossbeam, in the process of integrally hoisting steel structure crossbeam, rigidity leg and flexible leg put in place along with the lifting of crossbeam promotes together, it is characterized in that comprising the installation of pylon and cat head gantry beam, the lifting of crossbeam, the installation of rigidity leg and the installation of flexible leg, wherein

The installation of pylon and cat head gantry beam: with two secondary tower framves is to promote pylon, pylon bottom and basis, ground bolt together; The top of every secondary tower frame is provided with the cat head Long Menliang of box-structure, promptly promotes crossbeam, and elevating ram is placed on the beam of cat head gantry; With the squareness of theodolite calibration pylon, with guy steel strand fixed gantry, and with ground tackle that the head-clamp alive of guy steel strand is tight;

The lifting of crossbeam: promote for the first time, stop when promoting about ten meters left and right sides, load onto rigidity leg topside and flexible leg A prefix, the calibrated horizontal position, and fix, before promoting for the second time, with second hinge rigidity leg one end is linked on the crossbeam, the other end of rigidity leg is placed on two slippage dollies, and the rigidity leg promotes autofitting with crossbeam, the calibration axis connects with electric welding; Simultaneously, before promoting for the second time, flexible leg is linked on the A prefix with the 4th hinge;

The installation of rigidity leg: the first step, the desired location is placed in the segmentation of rigidity leg, adjusts the two ends upper-lower position with thousand tops, hydraulic pressure top, connects second hinge and first hinge; In second step, rigidity leg segmentation one end rises with crossbeam, and the other end uses the winch traction, to overcome horizontal friction force; The 3rd step, with the traveling gear that assembles slowly push the rigidity leg below, crossbeam descends, with the calibration of segmentation place interface, welding;

The installation of flexible leg: the first step: after crossbeam promoted for the first time, the 4th hinge that the both sides, A prefix lower end of flexible leg are provided with symmetry was connected with the A prefix, and the other end links to each other with traveling gear with tri-joint mechanism; In second step, crossbeam promotes, and flexible leg is followed naturally, on the horizontal direction of flexible leg walking mechanism, applies a horizontal drag force, with less vertical-lift power; In the 3rd step, crossbeam puts in place, and flexible leg incision position closes up naturally.

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