CN212583278U

CN212583278U - Lifting device for lower lifting point

Info

Publication number: CN212583278U
Application number: CN202021194581.4U
Authority: CN
Inventors: 勾金旺; 杨新强; 朱海森
Original assignee: Tianjin Construction Technology Co ltd
Current assignee: Tianjin Construction Technology Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-02-23
Anticipated expiration: 2030-06-24

Abstract

The utility model provides a lower hoisting point lifting device, which relates to the field of steel structure engineering, and is symmetrically distributed around the truss, and comprises a lifting support, a hydraulic lifter, a steel strand, a hoisting plate and two groups of connecting rods, the utility model simplifies the form of the hoisting point, saves three temporary rods, reduces the measure amount of the temporary structure, greatly reduces a large amount of high-altitude disassembly work after the lifting is in place, and saves the construction period; promote the truss whole to the design elevation, carry out the member welding and two sets of upper chords to the mouth department again, with the construction volume and the construction degree of difficulty of the on-the-spot high latitude of greatly reduced, reduce construction cost.

Description

Lifting device for lower lifting point

Technical Field

The utility model relates to a steel construction engineering field especially relates to a lower hoisting point hoisting device.

Background

The truss structure is a beam-type member, which is an open-web girder consisting of a plurality of small-section rod pieces and is a statically determinate structure; because the section of the beam can be made very high, the beam has large bending resistance and small deflection, so that the beam is suitable for the span larger than that of a solid web girder, and the beam saves materials and has small self weight; truss structures are commonly used in large-span public buildings such as factory buildings, exhibition halls, gymnasiums and bridges; due to the roof structure, which is mostly used for construction, the truss is often also referred to as roof truss.

The truss often accomplishes the main part welding on ground, recycles lifting device and puts it hoist and mount in place, and the tradition way: the conventional temporary hoisting point for spatial structure hoisting is in a structural form that three temporary rods are converged into a hoisting point (namely a hoisting point), and the hoisting point is in a perforated welding ball structure; the three temporary rods of the structure are dismantled after being lifted in place, and the perforated welding ball non-standard part needs to be specially customized.

The construction method has the following defects: firstly, the construction difficulty is high, and the installation in-place difficulty is high; secondly, the deformation control difficulty in the lifting process is high; thirdly, the construction cost is high; fourthly, the construction period is long.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of overcoming the defects in the prior art, and provides a lower lifting point lifting device and a lower lifting point integrated integral lifting method, thereby realizing the great reduction of a large amount of high-altitude disassembly work after the lifting is in place and saving the construction period; and the construction amount and the construction difficulty of the high altitude of the site are reduced, and the construction cost is reduced.

The utility model discloses a realize through following technical scheme: the utility model provides a lower hoisting point hoisting device, this hoisting device symmetric distribution is around the truss, lower hoisting point hoisting device is including promoting the support, hydraulic pressure lifting mechanism, the steel strand wires, hanger plate and two sets of connecting rod, it fixes on the bracket at stand top to promote the support, hydraulic pressure lifting mechanism fixes on promoting the support, hydraulic pressure lifting mechanism upwards stimulates the steel strand wires, the lower extreme fixed connection of hanger plate and steel strand wires, the lower chord fixed connection in hanger plate and the truss outside, hanger plate and hydraulic pressure lifting mechanism coincide in vertical direction, two sets of connecting rods are located the tip of truss, the one end of connecting rod and the middle part fixed connection of lower chord, the other end of connecting rod and the first steel ball fixed connection in the truss outside, static definite structure is constituteed to connecting rod and truss.

The utility model simplifies the form of the hoisting point, saves three temporary rods, reduces the measure amount of the temporary structure, greatly reduces a large amount of high-altitude disassembly work after the hoisting is in place, and saves the construction period; promote the truss whole to the design elevation, carry out the member welding and two sets of upper chords to the mouth department again, with the construction volume and the construction degree of difficulty of the on-the-spot high latitude of greatly reduced, reduce construction cost.

According to the technical scheme, preferably, the hanging plate comprises the inserting plate and the lifting appliance which are detachably connected, the inserting plate is vertically inserted into the lower chord outside the truss, the inserting plate is fixedly connected with the lower chord, the lifting appliance is fixedly connected with the lower end of the steel strand, the inserting plate is permanently arranged in the lower chord, the lifting appliance is detachably connected with the inserting plate, and then on the basis of guaranteeing the structural strength, the construction is convenient for workers.

According to the technical scheme, preferably, when the lifting device is used for lifting, the connecting rod is used as a temporary suspender, so that the deformation problem of the truss in the lifting process is effectively inhibited; when the truss is hoisted in place, the connecting rods are used as reinforcing rods, and therefore the overall strength of the outer side of the truss is effectively enhanced.

A lower lifting point integrated integral lifting method uses a lower lifting point lifting device, and comprises the following steps:

fixedly mounting a lifting support on a bracket at the top of the upright post, and sequentially mounting a hydraulic lifter and a steel strand;

removing two groups of upper chords on the outer side of the truss, cutting the set length of the lower chords, welding two groups of connecting rods, vertically inserting an inserting plate into the lower chords at the end of the truss, fixedly connecting the inserting plate with the lower chords, fixedly connecting a lifting appliance with the lower ends of the steel strands, and detachably connecting the inserting plate with the lifting appliance;

the hydraulic lifter around the truss pulls the steel strand upwards, and the steel strand drives the truss to integrally lift upwards;

the truss is lifted to a set elevation, the two groups of upper chords, the intercepting sections of the lower chords and the truss end balls are welded in a repair mode, the two ends of the upper chords are fixedly connected with the truss end balls and the first steel balls respectively, the steel balls at the upper end portions of the upper chords are opposite to the stand columns in the vertical direction, and the central axis of the intercepting sections is coincident with the central axis of the lower chords.

The utility model has the advantages that: the utility model simplifies the form of the hoisting point, saves three temporary rods, reduces the measure amount of the temporary structure, greatly reduces a large amount of high-altitude disassembly work after the hoisting is in place, and saves the construction period; promote the truss whole to the design elevation, carry out the member welding and two sets of upper chords to the mouth department again, with the construction volume and the construction degree of difficulty of the on-the-spot high latitude of greatly reduced, reduce construction cost.

Drawings

Fig. 1 shows a schematic structural diagram of the embodiment of the present invention during hoisting.

Fig. 2 shows a schematic structural diagram after hoisting according to the embodiment of the present invention.

Fig. 3 shows a schematic structural diagram of a connection between a hanger plate and a truss according to an embodiment of the present invention.

Fig. 4 shows a schematic structural diagram of a hanger plate according to an embodiment of the present invention.

Fig. 5 shows a lifting leg top deformation diagram according to an embodiment of the invention.

Fig. 6 shows a lifting bracket stress ratio diagram according to an embodiment of the invention.

Fig. 7 shows a finite element analysis diagram according to an embodiment of the invention.

Fig. 8 shows a distribution diagram of lifting points when lifting a truss according to an embodiment of the invention.

In the figure: 1. lifting the support; 2. a hydraulic lifter; 3. steel strand wires; 4. a hanger plate; 5. a connecting rod; 6. inserting plates; 7. a spreader; 8. a lower chord; 9. a truss; 10. a first steel ball; 11. a bracket; 12. a column; 13. intercepting a section; 14. an upper chord; 15. the truss end ball.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

As shown in the figure, the utility model provides a lower lifting point lifting device, the lifting device is symmetrically distributed around the truss 9, the lower lifting point lifting device comprises a lifting support 1, a hydraulic lifter 2, a steel strand 3, a hanging plate 4 and two groups of connecting rods 5, wherein the lifting support 1 is fixed on a bracket 11 at the top of a stand column 12, the hydraulic lifter 2 is fixed on the lifting support 1, the hydraulic lifter 2 pulls the steel strand 3 upwards, the hanging plate 4 comprises a plug board 6 and a hanger 7 which are detachably connected, the plug board 6 is vertically inserted into a lower chord 8 at the outer side of the truss 9, the plug board 6 is fixedly connected with the lower chord 8, the hanger 7 is fixedly connected with the lower end of the steel strand 3, the plug board 6 is permanently stored in the lower chord 8, the hanger 7 is detachably connected with the plug board 6, further, the construction is convenient for workers on the basis of guaranteeing the structural strength, the hanger 7 and the hydraulic lifter 2 are coincided in the vertical direction, two sets of connecting rods 5 are located the tip of truss 9, and the one end of connecting rod 5 and the middle part fixed connection of lower chord 8, the other end of connecting rod 5 and the first steel ball 10 fixed connection in the truss 9 outside, connecting rod 5 and truss 9 constitute statically determinate structure.

Furthermore, when the lifting is carried out, the connecting rod 5 is used as a temporary suspender, so that the deformation problem of the truss 9 in the lifting process can be effectively inhibited; when the truss is hoisted in place, the connecting rods 5 are used as reinforcing rods, and therefore the overall strength of the truss 9 is effectively enhanced.

A lower lifting point integrated integral lifting method uses the lower lifting point lifting device, and the working process comprises the following steps:

(1) fixedly mounting a lifting support 1 on a bracket 11 at the top of an upright post 12, and sequentially mounting a hydraulic lifter 2 and a steel strand 3;

(2) removing the two groups of upper chords 14 on the outer side of the truss 9, cutting a cutting section 13 with a set length of the lower chord 8, wherein the cutting section 13 is preferably the length within the range of 1.25m from the center of the upright post 12, vertically inserting the inserting plate 6 into the lower chord 8 at the end of the truss 9, wherein the position is about 1.7m from the center of the upright post 12, fixedly connecting the inserting plate 6 with the lower chord 8, welding the two groups of connecting rods, fixedly connecting the lifting appliance 7 with the lower end of the steel strand 3, and detachably connecting the inserting plate 6 with the lifting appliance 7;

(3) the hydraulic lifter 2 around the truss 9 pulls the steel strand 3 upwards, and the steel strand 3 drives the truss 9 to integrally lift upwards;

(4) the truss 9 is lifted to a set elevation, two groups of upper chords 14, the intercepting sections 13 of the lower chords 8 and the truss end balls 15 are welded in a repair mode, the two ends of the upper chords 14 are fixedly connected with the truss end balls 15 and the first steel balls 10 respectively, the steel balls at the upper end portions of the upper chords are opposite to the stand columns 12 in the vertical direction, and the central axis of the intercepting sections 13 is overlapped with the central axis of the lower chords 8.

The stress calculation process for the lifting bracket 1 at the top of the column 12 is as follows:

as shown in fig. 5 and 6, the lifting support 1 and the upright post 12 (preferably, a steel pipe concrete column) are subjected to integral modeling calculation, the maximum lifting load is 940KN, the horizontal load (the maximum counter force 938KN of the lifting point) is 5% of the vertical load, the load division coefficient is 1.4, and as a result, the top horizontal displacement of the lifting support 1 is about 44 mm; the lifting end is bent downwards by about 18 mm; and the maximum stress ratio of the rod piece is about 0.71 to 0.9, so that the construction requirement is met.

As shown in fig. 7, during the lifting process, the maximum loads 931KN (200 ton lower hanger 7) and 453KN (60 ton lower hanger 7) are applied to the lower hanger, and by considering the load division coefficient of 1.4 times and through finite element analysis, the stress of the lower hanger is below 220MPa except for partial stress concentration, and the lifting requirement is met (the material of the hanger is Q345B steel).

As shown in fig. 8, according to the madars software simulation lifting force analysis, a plurality of groups of lifting point lifting devices are uniformly arranged on the top of the upright column.

The utility model has the advantages that: the utility model simplifies the form of the hoisting point, saves three temporary rods, reduces the measure amount of the temporary structure, greatly reduces a large amount of high-altitude disassembly work after the hoisting is in place, and saves the construction period; lifting the truss 9 to the designed elevation integrally, welding the rod piece at the opening and two groups of upper chords 14, greatly reducing the construction amount and the construction difficulty of the high altitude of the site, and reducing the construction cost.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a lower hoisting point hoisting device, this hoisting device symmetric distribution is around the truss, its characterized in that, lower hoisting point hoisting device is including promoting support, hydraulic pressure lifting mechanism, steel strand wires, hanger plate and two sets of connecting rods, it fixes on the bracket at stand top to promote the support, hydraulic pressure lifting mechanism fixes on promoting the support, hydraulic pressure lifting mechanism upwards stimulates the steel strand wires, the lower extreme fixed connection of hanger plate and steel strand wires, the lower chord fixed connection in hanger plate and the truss outside, hanger plate and hydraulic pressure lifting mechanism coincide, and is two sets of in vertical direction the connecting rod is located the tip of truss, the one end of connecting rod and the middle part fixed connection of lower chord, the other end of connecting rod and the first steel ball fixed connection in the truss outside, static definite structure is constituteed to connecting rod and truss.

2. A lower lifting point lifting device as claimed in claim 1, wherein the lifting plate comprises an insert plate and a lifting appliance which are detachably connected, the insert plate is vertically inserted into the lower chord outside the truss, the insert plate is fixedly connected with the lower chord, and the lifting appliance is fixedly connected with the lower end of the steel strand.

3. A lower lifting point lifting device according to claim 2, characterized in that the connecting rod is used as a temporary boom when lifting; when the hoisting is in place, the connecting rod is used as a reinforcing rod.