Hoisting method for hanging grating under roof large-span steel beam

Abstract

The invention discloses a hoisting method for a grid hung under a roof large-span steel beam. The hoisting method comprises the following steps that I, a tower crane is connected with a hoisting device, a steel wire rope recycling device is connected with the hoisting device, a steel wire rope locking device and a hoisting transfer beam, and the hoisting transfer beam is connected with a grid unit; iI, locking the steel wire rope by the lifting device; iII, the grating units are hoisted to the maximum height; iV, locking the steel wire rope by a steel wire rope locking device, and loosening the hoisting device; v, lowering the hoisting device, locking the steel wire rope by the hoisting device, and loosening the steel wire rope locking device; and VI, the step III, the step IV and the step V are repeated till the grating units are hoisted in place. The method is simple in process, easy to operate and high in construction efficiency, the construction cost is effectively controlled, the problem that hoisting in place cannot be achieved at a time due to the fact that the lifting height of a tower crane is limited is solved, the problem that a steel wire rope collides with an installed component in the direct hoisting process is also avoided, multiple winches do not need to be used for hoisting, and the equipment cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of roof steel structure construction, and in particular relates to a method for hoisting a grille hung under a large-span steel beam on a roof. Background Art

[0002] At present, the roof structure of cultural venues such as song and dance theaters usually adopts a design scheme of large-span steel beams and grilles suspended below. The construction process is: first install the large-span steel beams on the roof, then assemble the grilles on the ground, and then hoist them as a whole. There are the following problems: ① Although the risk of high-altitude operations can be reduced, the construction cost is relatively high; ② Due to the complex structure of the construction site and the presence of multiple elevations, the grille units need to be assembled on a flat site, and then transferred to the horizontal projection plane of the grille design position, and then vertically hoisted. When transferring the grille units horizontally, the wire rope will be hindered by the large-span steel beams on the roof; ③ During vertical hoisting, the angle of the wire rope will interfere with the installed components, making it impossible to hoist the grille into place. Usually, multiple winches are used for hoisting, but the hoisting rates of each winch are difficult to unify. During the hoisting process, it is easy to cause the grille structure to deform or even overturn, posing certain safety hazards. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a method for hoisting a grille hung under a large-span steel beam on a roof. The method has a simple process and is easy to operate. The method of hoisting the grille in blocks improves the construction efficiency and effectively controls the construction cost. The method can ensure that the grille is hoisted into place step by step, and solves the problem that the grille cannot be hoisted into place in one go due to the limited lifting height of the tower crane. The method also avoids the problem that the wire rope will collide with the installed components during direct hoisting. There is no need to use multiple winches for hoisting, which reduces the equipment cost.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A method for hoisting a grille under a large-span steel beam on a roof, characterized by comprising the following steps:

[0006] (a) Setting up a grille assembly platform and placing the grille frame on the grille assembly platform;

[0007] (b) placing the grid unit on the grid frame;

[0008] (c) Install wire rope locking devices and wire rope recovery devices on the roof main beams;

[0009] (d) Connect the tower crane wire rope of the tower crane with the first wire rope locker of the lifting device, pull out the wire rope on the automatic take-up wheel of the wire rope recovery device, and connect the first wire rope locker and the second wire rope locker of the wire rope locking device in sequence, and then pull it down vertically to connect with the lifting conversion beam below;

[0010] (e) Locking the first wire rope locker to lock the wire rope, and then starting the tower crane to drive the lifting transfer beam to rise until it contacts the grid unit and fix it, so that the grid unit is fixed on the lifting transfer beam;

[0011] (f) Continue to lift the grid unit to the maximum height that the tower crane can lift;

[0012] (g) locking the second wire rope locker to lock the wire rope, and then releasing the first wire rope locker to temporarily fix the grille unit in mid-air;

[0013] (h) Lower the lifting device to the top of the roof main beam and start the automatic wire reel to recycle the excess wire rope;

[0014] (i) Lock the first wire rope tensioner to lock the wire rope, and then release the second wire rope tensioner;

[0015] (j) repeating steps (f), (g), (h), and (i) until the grid unit is hoisted into place, and welding the grid unit to the roof main beam;

[0016] (k) Disassemble the grille unit and the lifting transfer beam, then untie the wire rope, transfer the lifting device and the lifting transfer beam to the next lifting location, and lift the next grille unit.

[0017] Furthermore, in step (d), after the steel wire rope is connected to the lifting conversion beam, the auxiliary steel wire rope on the second corbel support of the roof main beam is pulled down vertically and connected to the hand winch. The auxiliary steel wire rope passes through the hand winch and is anchored to the ground. This can prevent the grille unit suspended below from tipping over due to the unilateral force on the roof main beam when the second steel wire rope locker locks the steel wire rope, thereby improving safety.

[0018] Furthermore, in step (e), after starting the tower crane, the lifting is performed vertically to make the lifting conversion beam contact with the bottom surface of the upper beam of the grid unit, and spot welding is performed to fix the grid unit to the lifting conversion beam. This ensures that the contact area between the lifting conversion beam and the grid unit is sufficient, and the spot welding fixation can ensure reliable connection strength, improve safety, and reduce the difficulty of subsequent disassembly.

[0019] Furthermore, step (c) also includes installing the first corbel support, the second corbel support, and the third corbel support on the embedded parts on the outer wall, and then installing the wire rope locking device and the wire rope recovery device. Due to the distance between the outer wall and the roof main beam, the roof main beam cannot be fully used as a lifting point. The roof main beam is used on one side and the outer wall is used on the other side as a lifting point, which solves the distance problem, is simple to construct, easy to dismantle, and has low operation difficulty.

[0020] Furthermore, in step (d), the lifting device comprises a horizontal connecting rod and a first wire rope locker, and the horizontal connecting rod is arranged between the first wire rope lockers. The structure is simple, easy to use, low in cost, and economical and practical.

[0021] Furthermore, in step (c), the wire rope locking device comprises a second wire rope locking device, a first corbel support, a second corbel support and a hand chain hoist, the second wire rope locking device is arranged on the first corbel support, the first corbel support and the second corbel support are relatively distributed on the main beam of the roof, the second corbel support is connected with an auxiliary wire rope, and the auxiliary wire rope is connected to the hand chain hoist. The structure is simple, easy to use, low cost, economical and practical.

[0022] Furthermore, in step (c), the wire rope recovery device comprises a support rod, an automatic wire take-up wheel and a third corbel support, the automatic wire take-up wheel is rotatably connected between two support rods, the support rod is fixed on the third corbel support, and the third corbel support is fixed on the main beam of the roof. The structure is simple, easy to use, low cost, economical and practical.

[0023] Furthermore, in step (a), the grid frame includes a base, vertical beams and cross braces, wherein the vertical beams are arranged on the base, and the cross braces are arranged on the vertical beams, and the cross braces are used to support the upper beams of the grid unit. The structure is simple, the production is fast, the grid frame can be reused, and the practicability is strong.

[0024] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0025] 1. The construction surface of the grille assembly platform is flat, which makes it easy to assemble the grille on the horizontal projection plane of the grille design position, eliminating the impact caused by the height difference of the construction site.

[0026] 2. The process is simple and easy to operate. The method of lifting the grille in blocks improves the construction efficiency and effectively controls the construction cost.

[0027] 3. Lifting principle: The lifting device locks the wire rope through the first wire rope locker, and the second wire rope locker releases the wire rope. The tower crane is started to vertically lift the grille unit. When it is lifted to the highest point, the second wire rope locker locks the wire rope, and the first wire rope locker releases the wire rope to temporarily fix the grille unit in mid-air. Then the lifting device is lowered to the top of the roof main beam, and the wire rope is locked through the first wire rope locker. The second wire rope locker releases the wire rope and continues to lift to the maximum height that the tower crane can lift. Repeat the above operations until the grille unit is hoisted in place.

[0028] The present invention can ensure that the grille is hoisted into place step by step, solving the problem that the grille cannot be hoisted into place at one time due to the limited lifting height of the tower crane, and avoiding the problem that the wire rope will collide with the installed components during direct hoisting. There is no need to use multiple winches for hoisting, thus reducing equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] Figure 1 It is a structural schematic diagram of the connection between the lifting device, the wire rope locking device and the wire rope recovery device in the present invention;

[0031] Figure 2 It is a schematic diagram of the elevation arrangement of the connection between the lifting device and the lifting conversion beam in the present invention;

[0032] Figure 3 It is a schematic elevational arrangement diagram of the connection between the second corbel support and the hand chain hoist in the present invention;

[0033] Figure 4 It is a schematic diagram of the lifting of the grid unit in the present invention;

[0034] Figure 5 It is a schematic diagram of the plane layout of the main beam of the roof in the present invention;

[0035] Figure 6 It is a structural schematic diagram of the lifting device in the present invention;

[0036] Figure 7 It is a schematic diagram of the elevation layout of the outer wall in the present invention;

[0037] Figure 8 It is a schematic diagram of the plane arrangement of the main roof beam and the outer wall as the lifting point in the present invention;

[0038] Fig. 9 It is a structural schematic diagram of the connection between the first wire rope locker and the automatic take-up wheel in the present invention;

[0039] Fig.10 It is a schematic diagram of the planar structure of the connection between the hoisting conversion beam and the grid unit in the present invention;

[0040] Fig.11 It is a schematic diagram of the vertical structure of the grid frame in the present invention;

[0041] Fig.12 It is a schematic diagram of the layout of the grid assembly platform in the present invention.

[0042] In the figure: 1-grating assembly platform; 2-grating frame; 3-base; 4-vertical beam; 5-cross brace; 6-grating unit; 7-roof main beam; 8-first corbel support; 9-second corbel support; 10-third corbel support; 11-outer wall; 12-second wire rope locker; 13-hand hoist; 14-auxiliary wire rope; 15-support rod; 16-automatic take-up wheel; 17-hoisting device; 18-horizontal connecting rod; 19-first wire rope locker; 20-hoisting conversion beam; 21-tower crane wire rope; 22-embedded parts. DETAILED DESCRIPTION

[0043] A method for hoisting a grille hung under a large-span steel beam on a roof comprises the following steps:

[0044] (a) If Fig.12 As shown, in the construction site, a grid assembly platform 1 is erected to the ground elevation using a disc frame, and the construction surface of the grid assembly platform 1 is flat, which facilitates the assembly of the grid on the horizontal projection plane of the grid design position, eliminating the impact caused by the height difference in the construction site.

[0045] A grid frame 2 is manufactured and arranged on the grid assembly platform 1 .

[0046] like Fig.11 As shown, the grid frame 2 includes a base 3, vertical beams 4 and cross braces 5. The base 3, vertical beams 4 and cross braces 5 are all steel sections. The vertical beams 4 are welded and fixed to the base 3, and the cross braces 5 are welded and fixed to the vertical beams 4. The grid frame 2 has a simple structure, is quick to manufacture, is reusable, and is highly practical.

[0047] (b) Assembling the grid unit 6, which is composed of two layers of steel beams, and placing the upper beam of the grid unit 6 on the cross brace 5 of the grid frame 2, which has high stability.

[0048] (c) If Figure 5 As shown, a wire rope locking device and a wire rope recovery device are installed on the roof main beam 7. Before the roof main beam 7 leaves the factory, the first corbel support 8, the second corbel support 9, and the third corbel support 10 have been welded and fixed on the roof main beam 7. The first corbel support 8 and the second corbel support 9 are relatively distributed, and the first corbel support 8, the second corbel support 9, and the third corbel support 10 are all composed of steel plates.

[0049] like Figure 7 and Figure 8 As shown, the first corbel support 8, the second corbel support 9, and the third corbel support 10 are welded and fixed on the embedded parts 22 on the outer wall 11, the first corbel support 8 and the second corbel support 9 are relatively distributed, and then the wire rope locking device and the wire rope recovery device are installed.

[0050] Due to the distance between the outer wall 11 and the roof main beam 7, the roof main beam 7 cannot be fully utilized as a lifting point. The roof main beam 7 is used on one side and the outer wall 11 is used on the other side as a lifting point. This solves the distance problem, is simple to construct, easy to dismantle, and has low operating difficulty.

[0051] The wire rope locking device includes a second wire rope locker 12, a first corbel support 8, a second corbel support 9 and a hand winch 13. The second wire rope locker 12 is spot welded and fixed on the first corbel support 8. The second wire rope locker 12 is a clip-type anchor. The second wire rope locker 12 is provided with a lifting lug for the wire rope to pass through. The second corbel support 9 is connected with an auxiliary wire rope 14, and the auxiliary wire rope 14 is connected to the hand winch 13. The wire rope locking device has a simple structure, is easy to use, has low cost, and is economical and practical.

[0052] The wire rope recovery device comprises a support rod 15, an automatic wire reel 16 and a third corbel support 10. The automatic wire reel 16 is rotatably connected between the two support rods 15. The automatic wire reel 16 can release the wire rope when subjected to external tension, and automatically recover the wire rope when the external tension is removed. The support rod 15 is spot-welded and fixed on the third corbel support 10. The wire rope recovery device has a simple structure, is easy to use, has a low cost, and is economical and practical.

[0053] (d) If Figure 6 As shown, the lifting device 17 includes a horizontal connecting rod 18 and a first wire rope locker 19. The horizontal connecting rod 18 is connected between two first wire rope lockers 19 by bolts. The first wire rope locker 19 is a clip-type anchor. The first wire rope locker 19 is provided with a lifting lug for the wire rope to pass through. The lifting device 17 has a simple structure, is easy to use, has low cost, and is economical and practical.

[0054] The hoisting conversion beam 20 is an H-shaped steel beam, and a lifting lug for the steel wire rope to pass through is provided on the hoisting conversion beam 20 .

[0055] like Figure 1 and Fig. 9 As shown, the tower crane wire rope 21 of the tower crane is connected to the first wire rope locker 19 as a lifting power source. Then the wire rope on the automatic take-up wheel 16 is pulled out, and the first wire rope locker 19 and the second wire rope locker 12 are connected in sequence, and then pulled down vertically to connect with the lifting conversion beam 20 below.

[0056] like Figure 3As shown, the auxiliary steel wire rope 14 on the second corbel support 9 is then pulled down vertically and connected to the upper and lower ends of the hand chain hoist 13 in sequence. The auxiliary steel wire rope 14 passes through the hand chain hoist 13 and is connected and fixed to the ground anchor on the ground, and then the hand chain hoist 13 is tightened. This can prevent the grille unit 6 suspended below from tipping over due to the unilateral force on the roof main beam 7 when the second steel wire rope locker 12 is locking the steel wire rope, thereby improving safety.

[0057] (e) If Figure 2 and Fig.10 As shown, the first wire rope locker 19 is locked to lock the wire rope, and then the tower crane is started to lift vertically so that the hoisting conversion beam 20 contacts the bottom surface of the upper beam of the grid unit 6, and spot welding is performed to fix the grid unit 6 on the hoisting conversion beam 20. It is ensured that the contact area between the hoisting conversion beam 20 and the grid unit 6 is sufficient, and the spot welding fixation can ensure reliable connection strength, improve safety, and reduce the difficulty of subsequent disassembly.

[0058] (f) Continue to lift the grid unit 6 to the maximum height that the tower crane can lift.

[0059] (g) Figure 4 As shown, the second wire rope locker 12 is locked to lock the wire rope, and then the first wire rope locker 19 is released to temporarily fix the grid unit 6 in mid-air.

[0060] (h) The lifting device 17 is lowered to the top of the roof main beam 7, and the automatic wire reel 16 is started to recycle the excess wire rope.

[0061] (i) Lock the first wire rope locker 19 to lock the wire rope, and then release the second wire rope locker 12.

[0062] (j) Repeat steps (f), (g), (h) and (i) until the grid unit 6 is hoisted into place, and then weld the grid unit 6 to the roof main beam 7.

[0063] (k) The grid unit 6 is disassembled from the lifting transfer beam 20, and then the wire rope is untied, and the lifting device 17 and the lifting transfer beam 20 are transferred to the next lifting location to lift the next grid unit 6.

[0064] After all the grille units 6 are installed, remove the wire rope locking device and the wire rope recovery device for recovery.

[0065] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A method for hoisting a grille under a large-span steel beam on a roof, characterized in that The steps include: (a) Setting up a grille assembly platform and placing the grille frame on the grille assembly platform; (b) placing the grid unit on the grid frame; (c) Install wire rope locking devices and wire rope recovery devices on the roof main beams; (d) Connect the tower crane wire rope of the tower crane with the first wire rope locker of the lifting device, pull out the wire rope on the automatic take-up wheel of the wire rope recovery device, and connect the first wire rope locker and the second wire rope locker of the wire rope locking device in sequence, and then pull it down vertically to connect with the lifting conversion beam below; (e) Locking the first wire rope locker to lock the wire rope, and then starting the tower crane to drive the lifting transfer beam to rise until it contacts the grid unit and fix it, so that the grid unit is fixed on the lifting transfer beam; (f) Continue to lift the grid unit to the maximum height that the tower crane can lift; (g) locking the second wire rope locker to lock the wire rope, and then releasing the first wire rope locker to temporarily fix the grille unit in mid-air; (h) Lower the lifting device to the top of the roof main beam and start the automatic wire reel to recycle the excess wire rope; (i) Lock the first wire rope tensioner to lock the wire rope, and then release the second wire rope tensioner; (j) repeating steps (f), (g), (h), and (i) until the grid unit is hoisted into place, and welding the grid unit to the roof main beam; (k) Disassemble the grille unit and the lifting transfer beam, then untie the wire rope, transfer the lifting device and the lifting transfer beam to the next lifting location, and lift the next grille unit.

2. The method for hoisting a grille under a large-span steel beam on a roof according to claim 1, characterized in that: In step (d), after the steel wire rope is connected to the lifting conversion beam, the auxiliary steel wire rope on the second corbel support of the roof main beam is pulled down vertically and connected to the hand winch. The auxiliary steel wire rope passes through the hand winch and is anchored to the ground.

3. The method for hoisting a grille under a large-span steel beam on a roof according to claim 1, characterized in that: In step (e), after starting the tower crane, the lifting is performed vertically to make the lifting transfer beam contact with the bottom surface of the upper beam of the grid unit, and spot welding is performed to fix the grid unit on the lifting transfer beam.

4. The method for hoisting a grille under a large-span steel beam on a roof according to claim 1, characterized in that: Step (c) also includes installing a first corbel support, a second corbel support, and a third corbel support on the embedded parts on the outer wall, and then installing a wire rope locking device and a wire rope recovery device.

5. The method for hoisting a grille under a large-span steel beam on a roof according to claim 1, characterized in that: The lifting device in step (d) includes a horizontal connecting rod and a first wire rope locker, and the horizontal connecting rod is arranged between the first wire rope lockers.

6. The method for hoisting a grille under a large-span steel beam on a roof according to claim 1, characterized in that: The wire rope locking device in step (c) includes a second wire rope locker, a first corbel support, a second corbel support and a hand winch, the second wire rope locker is arranged on the first corbel support, the first corbel support and the second corbel support are relatively distributed on the main beam of the roof, the second corbel support is connected to an auxiliary wire rope, and the auxiliary wire rope is connected to the hand winch.

7. The method for hoisting a grille under a large-span steel beam on a roof according to claim 1, characterized in that: The wire rope recovery device in step (c) includes a support rod, an automatic take-up wheel and a third corbel support, wherein the automatic take-up wheel is rotatably connected between the two support rods, the support rod is fixed on the third corbel support, and the third corbel support is fixed on the main beam of the roof.

8. The method for hoisting a grille under a large-span steel beam on a roof according to claim 1, characterized in that: The grid frame in step (a) includes a base, vertical beams and cross braces, wherein the vertical beams are arranged on the base, and the cross braces are arranged on the vertical beams, and the cross braces are used to support the upper beams of the grid unit.

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