CN205557816U - A hoisting frame for hoist and mount of large -scale truss - Google Patents

Abstract

A hoisting frame for hoisting large trusses, providing lifting points for hoisting, and hoisting the trusses to a predetermined height of the main structure, including two pre-embedded steel beams extending horizontally from the main structure, and two pre-embedded steel beams The pre-embedded height and overhanging length are equal, and a box-shaped corbel for fixing the jack is welded on both sides of the end beam body; a torsion-resistant steel beam is connected between the two pre-embedded steel beams; The truss façade bracing between the outer end of the pre-embedded steel beam and the main structure 2, and the stiff column connection corbel connected and fixed with the truss façade bracing after protruding from the main structure. The two ends of the torsion-resistant steel beam are fully penetration welded to the two box-shaped corbels between the two pre-embedded steel beams. The utility model has the advantages of reasonable design, simple structure and high strength. During construction, the torsion-resistant steel beam helps to keep the four lifting points lifted synchronously, and effectively solves the problems caused by the large area and self-heavyness during the hoisting process of the large-scale steel corridor truss. Poor balance issues.

Description

A lifting frame used for hoisting large trusses

technical field

The utility model relates to the technical field of truss hoisting construction, in particular to a lifting frame used for hoisting large trusses.

Background technique

Large-scale trusses are widely used in complex high-rise building structural systems, and their spans are several meters long or tens of meters long. Because it is generally made of steel structure materials, its own weight is extremely large. At present, large-scale trusses generally adopt the method of overall lifting after assembling on the ground. The overall lightness requirements are extremely high, and due to the large span and large footprint, it is generally necessary to set up multiple lifting points to lift at the same time. During the lifting process, technical problems such as difficult balance control or safety cannot be guaranteed, making it difficult to quickly lift construction.

Utility model content

The purpose of this utility model is to provide a hoisting frame for large-scale truss hoisting, which solves the problems in the prior art that large-scale steel corridor trusses occupy a large area, are heavy, have poor stability, and are difficult to carry out hoisting construction, and effectively solve large-scale trusses. During the hoisting process of steel corridor trusses, technical problems such as uncontrollable balance and unguaranteed safety are prone to occur.

In order to achieve the above technical purpose, the utility model takes the following technical solutions:

A hoisting frame for hoisting large trusses, providing lifting points for hoisting, and hoisting the trusses to a predetermined height of the main structure, characterized in that it includes two pre-embedded steel beams extending horizontally from the main The pre-embedded height and overhanging length of the shaped steel beams are equal, and a box-shaped corbel for fixing the jack is welded on both sides of the end beam body; a torsion-resistant steel beam is connected between the two pre-embedded shaped steel beams .

Further, it also includes a truss façade bracing supported between the outer end of the pre-embedded steel beam and the main structure, and a stiff column connection corbel connected and fixed with the truss façade bracing after protruding from the main structure.

Preferably, the torsion-resistant steel beam is a box-shaped girder, and the two ends are fully penetrated welded to the two box-shaped corbels between the two pre-embedded steel beams.

The overall height of the lifting frame can be equal to the height of a floor, the elevation of the pre-embedded steel beam is the same as that of the upper floor, and the elevation of the bottom end of the diagonal bracing of the truss facade is the same as that of the lower floor.

The overall height of the lifting frame can also be equal to the height of two floors, the elevation of the embedded steel beam is the same as that of the upper floor, and the elevation of the bottom end of the truss façade brace is the same as that of the lowermost floor.

The ends of the two pre-embedded steel beams are set as lifting points. There are two lifting points in total. The distance between the two lifting points is adapted to the distance between the two lifting points on the large truss. One jack is respectively installed on the two box-shaped corbels on both sides, and the two jacks are set in parallel.

In order to increase stability, the bottom end of the jack is spot-welded with the upper surface of the box-shaped corbel.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. The torsion-resistant steel beam is installed on the lifting frame: the end of the pre-embedded steel beam is set as the lifting point, and the torsion-resistant steel beam is welded between the two lifting points. The box-shaped corbel in the middle of the pre-buried steel beam is fully penetrated and welded, and the setting of the torsion-resistant steel beam greatly enhances the strength and stability of the lifting frame;

2. High strength: at the lifting point, the rigid column corbel and steel beam of the lifting frame are all high-strength pre-buried structures, and the jack adopts limit measures to spot weld the bottom end of the jack to the upper end of the box corbel Fixed to ensure the firmness and strength of the connection between the lifting frame and the main structure;

To sum up, the utility model aims at the problems of large size, self-heavyness and poor stability of the large-scale steel corridor truss, and designs a special lifting frame, which has high strength, reasonable design, convenient operation process control, and good stability. The hoisting construction has important guiding significance, especially suitable for hoisting and hoisting of large-scale steel corridor trusses hoisted at four hoisting points.

Description of drawings

The above-mentioned and/or other aspects and advantages of the present utility model will become clearer and easier to understand through the detailed description in conjunction with the following drawings, which are only schematic and do not limit the utility model, wherein:

Fig. 1 is the overall structure schematic diagram of the lifting frame of the utility model embodiment;

Fig. 2 is a schematic diagram of the connection between the lifting frame and the main structure 2 of the utility model embodiment;

Figure 3 is a schematic diagram of the connection between the lifting frame and the truss 1 after the hoisting is completed in the embodiment of the present invention;

Reference signs: 1-truss, 2-main structure, 3-embedded steel beam, 4-truss façade brace, 5-stiff column connection corbel, 6-steel strand, 7-torsion steel beam , 8-jack, 9-floor, 10-box corbel.

detailed description

An embodiment of the lifting frame used for hoisting large-scale trusses according to the present invention will be described below with reference to the accompanying drawings.

As shown in Figure 1, the utility model relates to a hoisting frame used for hoisting large trusses, which provides lifting points for hoisting and lifts the trusses to a predetermined height of the main structure 2, and one can be symmetrically arranged on the main structures 2 on both sides according to the situation. Lifting frame, a lifting frame used for hoisting large-scale trusses, provides a lifting point for hoisting, and lifts the truss 1 to the predetermined height of the main structure 2, and is characterized in that it includes two pre-embedded steel bars extending horizontally from the main structure 2 Beam 3, the pre-embedded height and overhanging length of the two pre-embedded steel beams 3 are equal, and a box-shaped corbel 10 for fixing the jack 8 is welded on both sides of the beam body at the end; two pre-embedded steel beams 3 A torsion-resistant steel beam 7 is connected between the steel beams 3; it also includes a truss façade bracing 4 supported between the outer end of the pre-embedded steel beam 3 and the main structure 2, and a truss vertical support after extending from the main structure 2. The face brace 4 is connected to the fixed rigid column and the corbel 5 is connected. The torsion-resistant steel beam 7 is a box-shaped beam, and its two ends are respectively welded with two box-shaped corbels 10 between the two pre-embedded steel beams 3 through full penetration.

The end of the pre-embedded steel beam 3 is set as a lifting point, and there are two lifting points in total. The distance between the two lifting points is adapted to the distance between the two lifting points on the large truss. Jacks 8 are fixed on the box-shaped corbel 10; two jacks 8 arranged in parallel are fixed at each lifting point. The bottom of the jack 8 is spot welded to the upper surface of the box-shaped corbel 10 . The steel strand 6 passes through the beam body of the lifting frame from top to bottom, and is fixed with an anchor after passing through the lifting point of the truss; the hydraulic oil pump provides power for the jack 8 to drive the operation of the jack 8; the hydraulic control device is used to control the jack 8 runs.

The height and shape of the support frame are determined jointly with the situation of the main structure and the stress situation of the construction during the construction. In this embodiment, it can be equal to the height of a floor, and the elevation of the pre-embedded steel beam 3 is the same as that of the upper floor slab 9. The elevation of the bottom end of the truss facade bracing 4 is the same as the elevation of the floor 9 of the lower floor; it can also be equal to the height of two floors, the elevation of the embedded steel beam 3 is the same as the elevation of the upper floor 9, and the elevation of the truss vertical The bottom elevation of the face diagonal brace 4 is identical with the floor 9 elevation of the lowest floor. In this embodiment, as shown in Figure 2, the height of the supporting frame is equal to the height of a floor.

According to the construction site conditions and the overall assembly plan of the steel structure, the embodiment of the utility model chooses the construction process of lifting the steel structure corridor into place at one time after the overall assembly and welding of the ground of the steel structure corridor. Among them, the synchronous control requirements between the lifting points are relatively strict, and the load of each lifting point should be controlled within the range basically consistent with the theoretical calculation. During the synchronous lifting process of the overall steel structure, the displacement of each lifting point should be monitored in real time to ensure The synchronous displacement control of the overall lifting is mainly controlled, and the force value changes at each lifting point are monitored at the same time. During construction, the key positions should be strictly monitored while taking into account the reference of the force value, so as to ensure that the structural displacement control is accurate during lifting, and the lifting force value meets the design requirements. Since the synchronous lifting is controlled by computer, if the lifting is out of sync and exceeds the design value, the lifting will stop automatically. Including the following steps:

Step 1. Construction calculation and analysis: calculate and analyze the overall design before construction to ensure the safety of the construction process;

Step 2. Site layout: according to the results of construction calculation and analysis, carry out the site layout;

Step 3. Fabrication of trusses: Carry out sub-unit fabrication of steel corridor trusses to form unit blocks to be spliced;

Step 4. Production of auxiliary parts: including temporary reinforcement structure setting on the steel corridor truss;

Step 5. Pre-entry commissioning of the jack lifting equipment: Debug the jack lifting equipment before entering the site to confirm that it meets the entry conditions; before the lifting system of this project enters the site, the software and hardware must be debugged in the workshop, and then Single machine and overall online debugging to ensure the smooth progress of the lifting process. The anchorage must pass the inspection when entering the site. The tonnage of a single jack 8 is 250 tons, and the overall synchronous lifting technology of hydraulic jacks is adopted;

Step 6. Construction platform layout: Arrange and set up the construction operation platform, and install safety guardrails on both sides of the operation platform. The safety guardrails are erected with scaffolding tubes and closed with safety nets. Only after passing the inspection and acceptance can the operator carry out the operation. Add welded steel protection measures around the lifting point jack;

Step 7. Tooling equipment enters the site: After the construction operation platform is arranged, the tooling equipment that has passed the quality inspection is brought into the site;

Step 8. Ground assembly of the truss: use the support frame at the bottom to assemble the unit modules into a whole;

Step 9. Installation of the lifting frame: Before lifting, the lifting bracket needs to be installed. The installation is strictly in accordance with the design drawings. A pair of cantilevered tripods are installed on the main structure as the lifting frame, and the first lifting frame and the second A torsion-resistant steel beam 7 is respectively erected and fixed between the two cantilevered tripods in the second lifting frame;

Step 10. Installation and commissioning of jack lifting equipment: Install jack 8 and other lifting devices at the lifting point, and arrange hydraulic oil pumps and hydraulic control devices at the same time. Jack 8 has a set of lifting pressure devices and a set of anchoring pressure devices And a set of automatic tool anchors for safety, install various sensors, connect equipment, and carry out on-site no-load debugging; each lifting point is equipped with two jacks to complete the work together, and is controlled by a hydraulic oil pump, namely 1#, 2 # Jacks are placed at one lifting point, 3# and 4# jacks are placed at one lifting point, and two lifting points are controlled by one oil pump; 5#, 6# jacks are placed at one lifting point; 7#, 8# The jack is placed at one lifting point, and an oil pump controls two lifting points. Construction requires 2 hydraulic pump stations and 8 hydraulic jacks. In addition, it is equipped with a corresponding main control system, 2 sub-control boxes and several sensors and other equipment. During construction, the pump station is placed on the existing structure close to the construction operation point, and the electric switch box should be placed here; each group of pumps Personnel stand on the existing structure where the pump station is located; each group of surveyors must stand on the construction operation platform set up in advance, that is, at the lifting point, and one person observes one lifting point;

Step 11. Threading and pretensioning of the steel strand 6: the steel strand 6 passes through the torsion-resistant steel beam 7 and the lifting frame beam body from top to bottom, and then passes through the truss hanging point and fixes it with an anchor. This time, Φ15.2mm1860 steel strand 6 is used for lifting, and each jack 8 adopts 7 pieces of Φ15.2mm1860 steel strand 6, and the steel strand 6 is carefully inspected for cutting, and there must be no rust, mud, dust, etc. , to ensure safe and reliable lifting, according to the height of the truss to be lifted and the height required by the lifting device, the steel strand 6 should be unloaded, and sufficient excess length should be ensured to facilitate the penetration of the steel strand;

Step 12. The overall test lifting of truss 1: proceed according to the steps of the test lifting. If any abnormal phenomenon is found, stop immediately, analyze the cause, and continue after solving it; the construction personnel enter their respective positions, and all control instructions are all controlled by the main control The stage is issued, and the time for the trial lifting should be when all preliminary preparations are completed, and a windless sunny morning is selected according to the weather forecast. The height of the trial lifting is 30cm, the stabilization time is 1 hour, and the lifting speed is 5mm/min. Carry out a comprehensive inspection of the entire lifting system, take effective measures to ensure that each steel strand 6 at each lifting point is evenly stressed, and avoid some steel strands 6 being in a state of relaxation or low stress. If the above phenomenon occurs, the slack should be corrected immediately. Or the steel strand 6 with less stress is separately tensioned by a jack to make it in a tensioned state, so as to achieve a state where each steel strand 6 is evenly stressed;

Step 13, the overall formal lifting of the truss 1: after the trial lifting, the overall inspection is correct and the lifting process is entered. Proceed according to the steps during the trial lifting. If any abnormal phenomenon is found, stop immediately, analyze the cause, and continue after solving it. Stop once every 2 meters during normal lifting, check whether the error between each point is controlled within 50mm, if the displacement difference is too large, supply oil to the slower lifting point separately to ensure the synchronization of each point, in order to ensure the synchronization of lifting, in A total station is added to the lifting site to measure the displacement difference of the structural lifting point as an auxiliary measurement measure;

Step 14. Elevate to the design structural elevation: When the overall truss is elevated to 50-150mm below the design elevation, stop the elevation;

Step 15. Elevation retest and preparation before welding: retest the overall situation of the truss, which mainly includes the deflection of the truss, the height difference of the four lifting points of the truss, and retest the overall offset of the truss , to formulate corresponding corrective measures. In this process, the construction personnel above and the equipment control personnel need to coordinate and act in unison; the equipment control personnel adjust the equipment according to the measurement results of the construction personnel, and then adjust the four-point displacement of the truss, and finally reach the set elevation;

Step 16. Welding and forming, removal of tooling: As shown in Figure 3, after the truss is lifted into place, the truss and the lifting frame are closed and connected, and the components at the close are installed by the tower crane, the web is fixed with high-strength bolts, and the upper and lower flanges of the steel beam are welded and connected , and finally disassemble the lifting equipment and tooling, so far, the entire hoisting process is completed. The rods on the lifting frame can be regarded as a part of the original steel corridor. After being lifted into place, each end is welded correspondingly to form a complete rigid corridor truss structure.

The technical features disclosed above are not limited to the disclosed combination with other features, and those skilled in the art can also make other combinations among the technical features according to the purpose of the utility model, which shall prevail in order to achieve the purpose of the utility model.

Claims (7)

1. the hoisting frame for the lifting of large-scale truss, the hoist point of lifting is provided, truss (1) is promoted to the predetermined altitude of agent structure (2), it is characterized in that: include protruding horizontally up two pre-buried section steel beams (3) of agent structure (2), the pre-buried height of two pre-buried section steel beams (3) and to choose outward length the most equal, a box bracket (10) being used for fixing jack (8) is respectively welded in the both sides of its end beam body；Connect between two pre-buried section steel beams (3) and have antitorque girder steel (7).

A kind of hoisting frame lifted for large-scale truss the most according to claim 1, it is characterized in that: also include truss facade diagonal brace (4) being supported between pre-buried section steel beam (3) outer end and agent structure (2), and after agent structure (2) is stretched out, be connected fixing stiffened column connection bracket (5) with truss facade diagonal brace (4).

A kind of hoisting frame lifted for large-scale truss the most according to claim 1 and 2, it is characterised in that: described antitorque girder steel (7) is box beam, the two ends two box bracket (10) full penetrations respectively and between two pre-buried section steel beams (3).

A kind of hoisting frame lifted for large-scale truss the most according to claim 3, it is characterized in that: the whole height of described hoisting frame is equal to a story height, the absolute altitude of pre-buried section steel beam (3) is identical with the floor on upper strata (9) absolute altitude, and the bottom absolute altitude of truss facade diagonal brace (4) is identical with the floor of lower floor (9) absolute altitude.

A kind of hoisting frame lifted for large-scale truss the most according to claim 3, it is characterized in that: the whole height of hoisting frame is equal to two story heights, the absolute altitude of pre-buried section steel beam (3) is identical with the floor on upper strata (9) absolute altitude, and the bottom absolute altitude of truss facade diagonal brace (4) is identical with undermost floor (9) absolute altitude.

6. according to a kind of hoisting frame lifted for large-scale truss described in claim 3 any one, it is characterized in that: the end of two pre-buried section steel beams (3) is set to hoist point, totally two hoist points, in distance between two hoist points and large-scale truss, the distance between two suspension centres adapts, upper one jack (8) of each installation of two box brackets (10) of beam body both sides at hoist point, two jack (8) are arranged parallel.

7. according to a kind of hoisting frame lifted for large-scale truss described in any one of claim 4～6, it is characterised in that: the upper surface spot welding of the bottom of described jack (8) and box bracket (10) is fixed.