Temporary modification method of wide narrowing type for a tire type beam lifter

Abstract

The application discloses a temporary transformation method of a wide-to-narrow type of a tire type beam lifting machine, and comprises the following steps: controlling the beam lifting machine to lift and transport a plurality of box girders and stack the box girders on a high pedestal; moving a lifting head at both ends of the box girders from outside to inside; arranging a first lifting pad outside and a second lifting pad inside the lifting head near the front end of the box girder; arranging a jack on the top surface of the second lifting pad; opening two groups of bolt hole groups in the middle region of a supporting leg cross beam near the front end of the main beam of the beam lifting machine, and releasing the bolt connection between the supporting leg cross beam and the supporting leg; lifting the main beam by the jack to separate the supporting leg cross beam from the supporting leg; moving the separated supporting leg to the position directly below the bolt hole groups and aligning; controlling the jack to fall back to make the supporting leg cross beam fall on the supporting leg; and installing bolts at the bolt hole groups to fix the supporting leg cross beam and the supporting leg. The application has the advantages that the existing equipment in a beam yard is fully utilized, the wide-to-narrow type of the beam lifting machine is quickly and temporarily transformed, the transformation is simple, and the investment is small.

Description

Technical Field

[0001] This invention belongs to the technical field of beam lifting machine equipment, specifically relating to a temporary modification method for widening and narrowing a tire-type beam lifting machine. Background Technology

[0002] A gantry crane is a type of gantry crane used for lifting and transporting precast box girders. When there are widened or weighted sections of precast box girders in the precast box girder yard, the load-bearing capacity of the main beam and leg crossbeams of the tire-mounted gantry crane is tested. When the load-bearing capacity is insufficient, the tire-mounted gantry crane cannot complete the lifting and transport of the precast box girders. The main beam of the tire-mounted gantry crane is a pure curved beam, with the point of application of external forces close to the fulcrum, and the bending moment is controllable. The leg crossbeams of the tire-mounted gantry crane are simply supported beams subjected to concentrated forces at mid-span, which can be simplified into a steel frame together with the legs, resulting in a larger bending moment.

[0003] Therefore, those skilled in the art need a temporary modification method when the load-bearing capacity of the outrigger beams of a tire-mounted gantry crane is insufficient. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a temporary modification method for wide-to-narrowing tire-type lifting beams. This temporary modification method reduces the bending moment of the support beam by changing the connection position between the movable outrigger and the outrigger crossbeam.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] A temporary modification method for a tire-mounted beam lifting machine that can be widened or narrowed, characterized in that the temporary modification method includes the following steps:

[0007] S1: Arrange several elevated platforms at the location to be modified; control the tire-type beam lifting machine to lift several box girders and stack them on the elevated platforms from bottom to top;

[0008] S2: Control the lifting heads on the tire-mounted beam lifting machine located at both ends of the box girder to move from the outside to the inside; after the lifting heads are in place, arrange a first lifting pad on the outside of the lifting head near the front end of the box girder and a second lifting pad on the inside; wherein, the top surface of the first lifting pad directly supports the bottom surface of the main beam of the tire-mounted beam lifting machine, and the top surface of the second lifting pad is provided with a jack and supports the bottom surface of the main beam through the jack;

[0009] S3: Two sets of bolt holes are opened in the middle area of ​​the lower surface of the support leg beam of the tire lifting machine near the front end of the main beam of the tire lifting machine, and the bolt connection between the support leg beam and the two legs below it is released.

[0010] S4: Lift the jack on the second pad upwards to raise the main beam, so that the support leg beam on the lifting side of the main beam is separated from the two support legs below; seal the gap between the bottom surface of the main beam and the first pad, and then lower the jack on the second pad.

[0011] S5: Move the two separated legs inward to directly below the bolt hole group opened in step S3 and align them;

[0012] S6: Lift the jack upwards to disengage the main beam from the support of the first pad, remove the first pad, then control the jack to fall back so that the support leg beam rests on the two support legs, and install bolts at the two bolt hole groups to fix the support leg beam to the support legs.

[0013] S7: Following the methods in steps S2-S6, complete the modification of the support leg beam and the support leg near the rear end of the box girder.

[0014] In step S4, the jack lifts upward to a height of 20cm, and in step S6, the jack lifts upward to a height of 25cm.

[0015] After the bolt hole group is opened in step S3, a guide mechanism pointing to the support leg is fixedly installed on the bolt hole group. The guide mechanism includes a horizontal steel plate fixed on the bolt hole group and a vertical steel plate bent downward from both sides of the horizontal steel plate. The vertical steel plate extends to the support leg on the corresponding side. The vertical steel plates on both sides form a guide path when the support leg moves inward. After the support leg moves along the vertical steel plates on both sides to the position below the bolt hole group, the horizontal steel plate and the vertical steel plate are removed.

[0016] The advantages of this invention are:

[0017] (1) In the precast box girder yard, make full use of the existing equipment in the yard to realize the rapid temporary modification of the beam lifting machine from wide to narrow. The modification is simple, the investment is small, there is no need to return the equipment to the factory for modification, and the construction period is short.

[0018] (2) By changing the connection position between the movable outrigger and the outrigger beam, the bending moment of the outrigger beam is reduced;

[0019] (3) By fixing a guide mechanism consisting of horizontal and vertical steel plates on a pre-set group of bolt holes, the direction of the outriggers during translation can be effectively realized, and precise movement and positioning can be achieved, avoiding the time wasted by repeatedly adjusting the alignment position in the later stage and improving the installation progress. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the tire-type beam lifting machine for transporting box girders in this invention;

[0021] Figure 2 For the present invention Figure 1 AA view in the middle;

[0022] Figure 3 This is a schematic diagram of the tire-type beam lifting machine in this invention lifting the box girder to the top of the high platform;

[0023] Figure 4 For the present invention Figure 3 A schematic diagram showing the vertical positions of the main beam, box girder, and elevated platform in the cross-sectional direction;

[0024] Figure 5 This is a schematic diagram of the method of setting a first and a second pad on the box girder to support the main beam in this invention;

[0025] Figure 6 For the present invention Figure 5 BB view in the middle;

[0026] Figure 7 For the present invention Figure 5 CC view in the middle;

[0027] Figure 8 This is a schematic diagram of the bolt hole group on the support leg beam in this invention;

[0028] Figure 9 This is a schematic diagram illustrating how the main beam is supported by jacks to detach the support leg beam from the support leg in this invention.

[0029] Figure 10 This is a schematic diagram of the outrigger being translated towards the inside of the outrigger crossbeam in this invention;

[0030] Figure 11 This is a schematic diagram illustrating the removal of the first support pad and the lowering of the support leg beam to fix it to the support leg in this invention.

[0031] Figure 12 This is a schematic diagram of the modified tire-type beam lifting machine in this invention;

[0032] Figure 13 This is a schematic diagram of a guide mechanism installed at the bolt hole group in this invention;

[0033] Figure 14 This is a cross-sectional view of the guide mechanism in this invention. Detailed Implementation

[0034] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0035] like Figure 1-14The markings in the figure are as follows: main beam 1, box girder 2, support leg beam 3, support leg 4, crane head 5, high platform 6, first shim 7, second shim 8, jack 9, box girder internal support 10, bolt hole group 11, guide mechanism 12, horizontal steel plate 12a, vertical steel plate 12b.

[0036] Example: Figure 1-14 As shown, this embodiment specifically relates to a temporary modification method for a tire-mounted beam lifting machine that changes from wide to narrow. By changing the connection position between the movable outrigger 4 and the outrigger crossbeam 3, the bending moment of the outrigger crossbeam 3 is reduced. The method includes the following steps:

[0037] S1: As Figure 1 , 2 As shown in Figures 3 and 4, several elevated platforms 6 are arranged in the area to be modified and constructed. The arrangement should ensure that there is at least one set of elevated platforms 6 at each end. The tire-mounted beam lifting machine is controlled to lift two sets of box girders 2 and stack them sequentially from bottom to top on the pre-positioned elevated platforms 6. In this embodiment, the tire-mounted beam lifting machine includes a main beam 1 and support beams 3 located at both ends of the main beam 1. Each support beam 3, especially the two lower support legs 4, supports and moves along the main beam 1. A lifting system is installed on the main beam 1, and the two lifting heads 5 of the lifting system can move on the main beam 1 to lift both ends of the aforementioned box girder 2.

[0038] S2: As Figure 5 , 6 As shown in Figure 7, after the box girder 2 is hoisted, the two hoisting heads 5 on the main beam 1 are positioned above both ends of the box girder 2. These two hoisting heads 5 are controlled to move from the outside inwards to clear the end positions of the box girder 2. The front end of the box girder 2 is selected for construction first. A first lifting pad 7 and a second lifting pad 8 are respectively arranged on both sides of the hoisting head 5 near the front end of the box girder 2. The first lifting pad 7 is arranged on the outside of the hoisting head 5, and the second lifting pad 8 is arranged on the inside of the hoisting head 5. The top surface of the first lifting pad 7 directly supports the bottom surface of the main beam 1, and a jack 9 is also installed on the top surface of the second lifting pad 8, which supports the bottom surface of the main beam 1. It should be noted that, to ensure that the box girder 2 has sufficient support performance, an internal box girder support 10 is built into its cavity.

[0039] S3: As Figure 8 As shown, two sets of bolt hole groups 11 are opened in the middle area of ​​the lower surface of the support beam 3 near the front end of the main beam 1. The bolt hole groups 11 are opened according to the design position; at the same time, the bolt connection between the support beam 3 and the two lower supports 4 is released. Figure 13 , 14As shown, guide mechanisms 12 are installed at the positions of the pre-drilled bolt hole group 11. The guide mechanisms 12 can limit the path of the outrigger 4 during subsequent movement. The guide mechanism 12 includes a horizontal steel plate 12a and vertical steel plates 12b located on both sides of the horizontal steel plate 12a. The two together form a guide limiting groove. The horizontal steel plate 12a is temporarily fixed to the bolt hole group 11 by bolts, while the vertical steel plate 12b extends to the initial position of the outrigger 4.

[0040] S4: As Figure 9 As shown, the jack 9 on the second lifting pad 8 is lifted 20cm upwards to raise the main beam 1, thereby separating the support beam 3 on the lifting side of the main beam 1 from the two support legs 4 below; the newly created gap between the bottom surface of the main beam 1 and the first lifting pad 7 is compacted by the lifting pad, and then the jack 9 on the second lifting pad 8 is lowered back, so that the first lifting pad 7 supports the main beam 1 to maintain the lifting state.

[0041] S5: As Figure 10 and 13 As shown in 14, the two separated legs 4 are moved inward to the area directly below the bolt hole group 11 opened in step S3 and aligned. During the movement, the guide groove formed by the guide mechanism 12 limits and guides the movement of the top of the legs 4 to prevent deviation. After the movement is in place, the guide mechanism 12 is removed.

[0042] S6: As Figure 11 As shown, the jack 9 is lifted upwards by 25cm to disengage the main beam 1 from the support of the first pad 7. The first pad 7 is then removed. Afterwards, the jack 9 is controlled to fall back so that the support leg beam 3 rests on the two support legs 4. Bolts are installed at the two bolt hole groups 11 to fix the support leg beam 3 to the support legs 4.

[0043] S7: Following the steps S2-S6, complete the modification of the support beam 3 and support leg 4 near the rear end of box girder 2.

[0044] The beneficial effects of this embodiment are as follows:

[0045] (1) In the precast box girder yard, make full use of the existing equipment in the yard to realize the rapid temporary modification of the beam lifting machine from wide to narrow. The modification is simple, the investment is small, there is no need to return the equipment to the factory for modification, and the construction period is short.

[0046] (2) By changing the connection position between the movable outrigger and the outrigger beam, the bending moment of the outrigger beam is reduced;

[0047] (3) By fixing a guide mechanism consisting of horizontal and vertical steel plates on a pre-set group of bolt holes, the direction of the outriggers during translation can be effectively realized, and precise movement and positioning can be achieved, avoiding the time wasted by repeatedly adjusting the alignment position in the later stage and improving the installation progress.

Claims

1. A temporary modification method for a tire-mounted beam lifting machine that can be widened or narrowed, characterized in that... The temporary modification method includes the following steps: S1: Arrange several elevated platforms at the location to be modified; control the tire-type beam lifting machine to lift several box girders and stack them on the elevated platforms from bottom to top; S2: Control the lifting heads on the tire-mounted beam lifting machine located at both ends of the box girder to move from the outside to the inside; after the lifting heads are in place, arrange a first lifting pad on the outside of the lifting head near the front end of the box girder and a second lifting pad on the inside; wherein, the top surface of the first lifting pad directly supports the bottom surface of the main beam of the tire-mounted beam lifting machine, and the top surface of the second lifting pad is provided with a jack and supports the bottom surface of the main beam through the jack; S3: Two sets of bolt holes are opened in the middle area of ​​the lower surface of the support leg beam of the tire lifting machine near the front end of the main beam of the tire lifting machine, and the bolt connection between the support leg beam and the two legs below it is released. S4: Lift the jack on the second pad upwards to raise the main beam, so that the support leg beam on the lifting side of the main beam is separated from the two support legs below; seal the gap between the bottom surface of the main beam and the first pad, and then lower the jack on the second pad. S5: Move the two separated legs inward to directly below the bolt hole group opened in step S3 and align them; S6: Lift the jack upwards to disengage the main beam from the support of the first pad, remove the first pad, then control the jack to fall back so that the support leg beam rests on the two support legs, and install bolts at the two bolt hole groups to fix the support leg beam to the support legs. S7: Following the methods in steps S2-S6, complete the modification of the support leg beam and the support leg near the rear end of the box girder.

2. The temporary modification method for a tire-mounted beam lifting machine that can be widened or narrowed according to claim 1, characterized in that... In step S4, the jack lifts upward to a height of 20cm, and in step S6, the jack lifts upward to a height of 25cm.

3. The temporary modification method for a tire-mounted beam lifting machine that can be widened or narrowed according to claim 1, characterized in that... After the bolt hole group is opened in step S3, a guide mechanism pointing to the support leg is fixedly installed on the bolt hole group. The guide mechanism includes a horizontal steel plate fixed on the bolt hole group and a vertical steel plate bent downward from both sides of the horizontal steel plate. The vertical steel plate extends to the support leg on the corresponding side. The vertical steel plates on both sides form a guide path when the support leg moves inward. After the support leg moves along the vertical steel plates on both sides to the position below the bolt hole group, the horizontal steel plate and the vertical steel plate are removed.

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