A construction method for hoisting beam and slab

Abstract

The present invention discloses a construction method for hoisting beam slabs, which includes the following steps: erect a bridge erection machine on two groups of capping beams, and the bridge erection machine is located at the 4# beam - 8# beam of the left side of the capping beam. Move backward at the middle support leg of the bridge erection machine, and then install two hoisting overhead cranes on the bridge erection machine; move the I-beam to the area between the two groups of capping beams, and the hooks on the two hoisting overhead cranes hang on the steel strand rings on the I-beam; then make the two hoisting overhead cranes lift the I-beam synchronously and horizontally, and move the I-beam to the bottom of the capping beam. The present invention relates to the technical field of hoisting. For this construction method for hoisting beam slabs, the present invention uses two hoisting overhead cranes of the bridge erection machine for double-point hoisting, and completes the installation of beam slabs through horizontal synchronous operation and longitudinal differential operation. There is no need to requisition land outside the red line to set up a beam lifting station, which maximally protects the original ecology and environment, and solves the problem of hoisting beam slabs, having good economic, social and environmental benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting, and specifically to a construction method for hoisting beam slabs. Background Art

[0002] In bridge engineering, the hoisting of beam slabs often involves sub - projects with relatively high risks. Prefabricated bridges have the advantages of fast and efficient construction, and the working face can be fully developed. However, during the bridge construction process, due to reasons such as land expropriation and demolition, pole line relocation, etc., individual bridge piers are not completed; or because the bridge is long and needs to be hoisted in sections, etc., the beam transportation line on the bridge is interrupted.

[0003] In response to the above situation, the traditional method is to set up a beam lifting station using the space outside the bridge red line. After lifting the beam slabs onto the bridge through the beam lifting station, they are erected in sequence. It is necessary to use the space outside the bridge red line, and it is easy to damage the original appearance of the land outside the red line during installation, damaging the ecological environment and being not conducive to actual use.

[0004] Moreover, during the beam slab hoisting process, the existing hooks are all closed through a snap - type structure, and are prone to damage and cause accidents after being used too many times. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a construction method for hoisting beam slabs, which solves the problems that it is easy to damage the original appearance of the land outside the bridge red line and damage the ecological environment during the hoisting of beam slabs, and that the existing hooks are all closed through a snap - type structure and are prone to damage and cause accidents after being used too many times.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A construction method for hoisting beam slabs, including the following steps:

[0007] Step 1: Install the bridge erection machine on two groups of capping beams, and the bridge erection machine is located at the 4# beam - 8# beam on the left side of the capping beam. Move the middle support leg of the bridge erection machine backward by 2 meters;

[0008] Then install two hoisting overhead cranes on the bridge erection machine;

[0009] Step 2: Move the I - beam to the area between the two groups of capping beams. The hooks on the two hoisting overhead cranes hang on the steel strand rings on the I - beam;

[0010] Then make the two hoisting overhead cranes lift the I - beam synchronously and horizontally, and lift the I - beam to the bottom of the capping beam;

[0011] Step 3: Move the two hoisting overhead cranes forward synchronously by 1 meter on the bridge erection machine, so that the rear end of the I - beam is not blocked by the capping beam;

[0012] The rear lifting overhead crane slowly lifts, so that the rear end of the I-beam crosses the capping beam, and the inclination angle of the I-beam does not exceed 12°;

[0013] Step 4: The two lifting overhead cranes move backward synchronously, so that the lifted I-beam is inserted into the gap between the left 6# beam and 7# beam;

[0014] Step 5: When the front end of the I-beam retreats to a position not affected by the front capping beam, the front lifting overhead crane slowly lifts, so that the front end of the I-beam crosses the capping beam, and the I-beam tends to be in a horizontal state;

[0015] Finally, the positions of the beam slab are adjusted by the two lifting overhead cranes, and it can be normally placed in position.

[0016] Preferably, in Step 1: The two lifting overhead cranes are slidably connected to the upper part of the bridge erecting machine, and the two lifting overhead cranes are relatively independently arranged.

[0017] Preferably, in Step 2: The hook includes a suspension seat cylinder, a hook and an anti-drop sleeve. A pull rod is fixedly connected to the upper end of the hook, and a sliding hole is opened at the center of the bottom of the suspension seat cylinder;

[0018] The pull rod passes through the sliding hole and extends to the inside of the suspension seat cylinder, and a limiting block is fixedly connected to the end of the pull rod located inside the suspension seat cylinder;

[0019] A first spring is arranged on the outer side of the upper part of the pull rod, and both ends of the first spring are respectively in contact with the limiting block and the inner bottom side of the suspension seat cylinder;

[0020] Preferably, the anti-drop sleeve is sleeved on the lower part of the pull rod. A second spring is arranged on the outer side of the lower part of the pull rod, and both ends of the second spring are respectively in contact with the hook and the inner top side of the anti-drop sleeve.

[0021] Preferably, a pressing component is arranged in the middle of the pull rod. The pressing component includes a cross bar and two groups of toothed rods;

[0022] The middle of the cross bar is fixedly connected to the middle of the pull rod. Shaft rods are rotatably connected to both ends of the cross bar, and a gear is fixedly connected to the front end of the toothed rod, and a centrifugal disc is fixedly connected to the rear end of the toothed rod.

[0023] Preferably, the upper part of the toothed rod is fixedly connected to the bottom sides of both sides of the suspension seat cylinder, and the toothed rod is in meshing transmission with the gear;

[0024] The bottom side of the centrifugal disc is in contact with the upper surface of the anti-drop sleeve.

[0025] Preferably, in Step 2: The steel strand sling is a precast structure, and the steel strand sling is embedded inside the capping beam;

[0026] The strand sling is composed of multiple groups of steel strands, multiple groups of sling steel pipes and a bottom pull plate. The length of the steel strand is 2m and its diameter is 3cm. The outer diameter of the sling steel pipe is 4cm and its thickness is 2mm.

[0027] The sling steel pipe is sleeved in the middle of the steel strand, and the steel strand and the sling steel pipe are bent to form a U-shaped structure.

[0028] Preferably, the two ends of the steel strand are dispersed.

[0029] The dispersed steel wires at the two ends of the steel strand are fixedly connected to the bottom pull plate through wire rope clips.

[0030] Beneficial effects

[0031] The present invention provides a construction method for lifting beam slabs. Compared with the prior art, it has the following beneficial effects:

[0032] When using the prefabricated strand sling to lift the beam, through practical tests, it overcomes the characteristics of the conventional wire rope bottom lift and the frame-type bottom lift, such as the heavy weight of the wire rope and the low efficiency of hanging and removing the rope. At the same time, the steel strand has high strength and can bear a large load.

[0033] When the hook of the present invention lifts the I-beam, through the meshing transmission of the gear and the toothed rod, the shaft rod drives the centrifugal disc to rotate, and presses against the anti-disengagement sleeve, so that the anti-disengagement sleeve is sleeved outside the hook, making the strand sling and the hook in a locked state. Thus, when the hook hangs the I-beam, the strand sling and the hook are prevented from falling off, eliminating potential safety hazards, and at the same time, it is convenient to disassemble between the strand sling and the hook.

[0034] The present invention uses two hoisting trolleys of the bridge girder erecting machine for double-point hoisting. Through horizontal synchronous operation and longitudinal differential operation, the installation of beam slabs is completed. There is no need to expropriate land outside the red line to set up a beam lifting station, which maximally protects the original ecology and environment, and solves the problem of beam slab hoisting, having good economic, social and environmental benefits. Description of the drawings

[0035] Figure 1 It is a schematic diagram of the hoisting sequence of the I-beam of the present invention;

[0036] Figure 2 It is a schematic diagram of the construction process of the present invention Figure 1 ;

[0037] Figure 3 It is a schematic diagram of the construction process of the present invention Figure 2 ;

[0038] Figure 4 It is a schematic diagram of the construction process of the present invention Figure 3 ;

[0039] Figure 5 Schematic diagram of the construction process of the present invention Figure 4 ;

[0040] Figure 6 Schematic diagram of the construction process of the present invention Figure 5 ;

[0041] Figure 7 Cross-sectional view of the structure of the hook of the present invention;

[0042] Figure 8 Front view of the structure of the hook of the present invention;

[0043] Figure 9 Front view of the structure of the strand sling of the present invention.

[0044] In the figure: 11, strand; 12, sling steel pipe; 13, bottom pull plate; 14, wire rope clip; 21, sling seat cylinder; 211, sliding hole; 22, hook; 23, pull rod; 24, limit block; 25, spring one; 26, anti-disengagement sleeve; 27, spring two; 31, cross bar; 32, toothed rod; 33, shaft rod; 34, gear; 35, centrifugal disc. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] The present invention provides a technical solution: This solution is only described with the central single-column pier solution. Due to the limited space at the lifting beam position of the central large cantilever pier capping beam and the limitation of the allowable eccentric load moment of its cantilever capping beam, the lifting sequence and its storage position are reasonably arranged;

[0047] Please refer to Figure 1 , and the lifting sequence is carried out in turn according to the positions of the left 1# beam, right 1# beam, left 2# beam, right 2# beam, left 3# beam, right 3# beam... left 8# beam, right 8# beam;

[0048] A method for lifting beam slabs includes the following steps:

[0049] Step 1: Install the bridge erection machine on two groups of capping beams, and the bridge erection machine is located at the left 4# beam - 8# beam of the capping beam. Move the middle support leg of the bridge erection machine backward by 2 meters to facilitate sufficient backward space when the lifting crane hoists the beam slab backward in the subsequent steps, as Figure 2 ;

[0050] Then install two overhead cranes on the bridge erecting machine. The two overhead cranes are slidably connected to the upper part of the bridge erecting machine and are relatively independently arranged.

[0051] Step 2: Move the I-beam to the area between the two sets of capping beams. The hooks on the two overhead cranes hang on the steel strand lifting rings on the I-beam.

[0052] Then make the two overhead cranes lift the I-beam synchronously and horizontally, and move the I-beam to the bottom of the capping beam, as Figure 3 ;

[0053] Step 3: Move the two overhead cranes forward 1 meter synchronously on the bridge erecting machine, so that the rear end of the I-beam is not blocked by the capping beam.

[0054] The rear overhead crane slowly lifts, so that the rear end of the I-beam crosses the capping beam, and the inclination angle of the I-beam does not exceed 12°, as Figure 4 ;

[0055] Step 4: The two overhead cranes move backward synchronously, so that the lifted I-beam is inserted into the gap between the left 6# beam and 7# beam, as Figure 5 ;

[0056] Step 5: When the front end of the I-beam retreats to a position not affected by the front capping beam, the front overhead crane slowly lifts, so that the front end of the I-beam crosses the capping beam and the I-beam tends to be horizontal.

[0057] Finally, adjust the position of the beam slab through the two overhead cranes and lower it into place normally, as Figure 6 ;

[0058] The present invention uses two overhead cranes of the bridge erecting machine for double-point lifting. Through horizontal synchronous operation and longitudinal differential operation, the installation of beam slabs is completed. There is no need to expropriate land outside the red line to set up a beam lifting station, which maximally protects the original ecology and environment, and solves the problem of beam slab hoisting, having good economic, social and environmental benefits.

[0059] Please refer to Figures 7 - 8, the hook includes a suspension seat cylinder 21, a hook 22 and an anti - detachment sleeve 26. The upper end of the hook 22 is fixedly connected with a pull rod 23. A sliding hole 211 is opened at the center of the bottom of the suspension seat cylinder 21. The pull rod 23 passes through the sliding hole 211 and extends to the inside of the suspension seat cylinder 21. And a limiting block 24 is fixedly connected to one end of the pull rod 23 located inside the suspension seat cylinder 21. A first spring 25 is arranged on the outer side of the upper part of the pull rod 23, and the two ends of the first spring 25 are respectively in contact with the limiting block 24 and the inner bottom side of the suspension seat cylinder 21. The anti - detachment sleeve 26 is sleeved on the lower part of the pull rod 23. A second spring 27 is arranged on the outer side of the lower part of the pull rod 23, and the two ends of the second spring 27 are respectively in contact with the hook 22 and the inner top side of the anti - detachment sleeve 26. A pressing component is arranged in the middle of the pull rod 23. The pressing component includes a cross bar 31 and two groups of toothed rods 32. The middle of the cross bar 31 is fixedly connected with the middle of the pull rod 23. Shaft rods 33 are rotatably connected to both ends of the cross bar 31. And a gear 34 is fixedly connected to the front end of the toothed rod 32. A centrifugal disc 35 is fixedly connected to the rear end of the toothed rod 32. The upper part of the toothed rod 32 is fixedly connected to the bottom of both sides of the suspension seat cylinder 21. And the toothed rod 32 is in meshing transmission with the gear 34. The bottom side of the centrifugal disc 35 is in contact with the upper surface of the anti - detachment sleeve 26. When the hook of the present invention hoists an I - shaped beam, through the meshing transmission of the gear 34 and the toothed rod 32, the shaft rod 33 drives the centrifugal disc 35 to rotate, and presses the anti - detachment sleeve 26, so that the anti - detachment sleeve 26 is sleeved on the outer side of the hook 22, making the steel strand sling ring and the hook 22 in a locked state. Thus, when the hook 22 hangs the I - shaped beam, the steel strand sling ring and the hook 22 will not fall off, eliminating potential safety hazards. At the same time, it is convenient to disassemble between the steel strand sling ring and the hook 22;

[0060] Please refer to Figure 9 , the steel strand sling ring is a prefabricated structure and is embedded inside the capping beam. The steel strand sling ring is composed of multiple groups of steel strands 11, multiple groups of sling steel pipes 12 and a bottom tension plate 13. The length of the steel strand 11 is 2m and its diameter is 3cm. The outer diameter of the sling steel pipe 12 is 4cm and its thickness is 2mm. The sling steel pipe 12 is sleeved in the middle of the steel strand 11. And the steel strand 11 and the sling steel pipe 12 are bent into a U - shaped structure. The two ends of the steel strand 11 are scattered. The scattered steel wires at both ends of the steel strand 11 are fixedly connected with the bottom tension plate 13 through wire rope clamps 14. Using the prefabricated steel strand sling ring for hoisting the beam, through practical tests, it overcomes the characteristics of the conventional wire rope bottom - sling hoisting and the frame - type bottom - sling hoisting, such as the heavy weight of the wire rope, and the low efficiency of hanging and removing the rope. At the same time, the steel strand has high strength and can bear a large load.

[0061] The hoisting processes of the first - span I - shaped beams of the central double - column piers, double - column portal piers and triple - column portal piers are the same as those of the first - span I - shaped beams of the central single - column piers;

[0062] For the hoisting of the cross I-beams of the central single-column pier and the central double-column pier capping beams, due to the influence of the capping beam cantilever, symmetric hoisting must be carried out along the bridge center line. For the double-column gantry piers, triple-column gantry piers and quadruple-column gantry piers, symmetric hoisting is not required according to the actual on-site conditions.

[0063] Since the beam-hoisting processes and environmental conditions of the central single-column pier, central double-column pier, double-column gantry pier, triple-column gantry pier and quadruple-column gantry pier are the same, the I-beams are symmetrically erected by a bridge girder erecting machine, and the left and right spans must be symmetrically erected simultaneously.

[0064] During hoisting, when the beam swings over the social vehicle passage, temporary traffic control is required.

[0065] At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0066] When the hook is in use, the hook 22 is hooked on the steel strand sling ring, and then the lifting crane drives the hook to hoist the I-beam. Then, due to the gravity of the I-beam acting on the hook 22, the pull rod 23 and the suspension seat cylinder 21 move relative to each other. Assuming the suspension seat cylinder 21 is stationary, the pull rod 23 slides and moves downward at the suspension seat cylinder 21. Then, the cross bar 31 moves along with the pull rod 23. Since the rack bar 32 is fixedly connected to the suspension seat cylinder 21, the rack bar 32 can be regarded as stationary. During the downward movement of the cross bar 31, the gear 34 meshes with the rack bar 32 for transmission. Then, the shaft rod 33 drives the centrifugal disc 35 to rotate, so that the side of the centrifugal disc 35 farther from the shaft rod 33 rotates to the lower side and presses against the anti-disengagement sleeve 26. Then, the anti-disengagement sleeve 26 moves along the pull rod 23 towards the hook 22 and sleeves on the outside of the hook 22, thus avoiding the phenomenon of the hook 22 falling off when hanging the I-beam.

[0067] After the lifting crane drives the hook to hoist the I-beam and finishes, the I-beam is supported by the capping beam. The hook is lowered. The hook is not affected by the gravity of the I-beam. Then, the spring 1 25 pushes the limit block 24, causing the pull rod 23 to drive the hook 22 to move towards the suspension seat cylinder 21. At the same time, the gear 34 meshes with the rack bar 32 for transmission. Then, the shaft rod 33 drives the centrifugal disc 35 to rotate, so that the side of the centrifugal disc 35 closer to the shaft rod 33 rotates to the lower side and contacts the anti-disengagement sleeve 26. Then, the anti-disengagement sleeve 26 is ejected by the spring 2 27, causing the anti-disengagement sleeve 26 to disengage from the buckling of the hook 22. Then, the hook 22 is taken out, and the hook 22 is disengaged from the hook connection with the steel strand sling ring.

[0068] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0069] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for hoisting beam-slab, characterized in that, It includes the following steps: Step 1: Install the bridge erection machine on two groups of capping beams, and the bridge erection machine is located at the 4# beam - 8# beam on the left side of the capping beam. Move backward at the middle support leg of the bridge erection machine, and then install two overhead cranes on the bridge erection machine; Step 2: Move the I-beam to the area between the two groups of capping beams. The hooks on the two overhead cranes hang on the steel strand sling rings on the I-beam; then make the two overhead cranes lift the I-beam synchronously and horizontally, and move the I-beam to the bottom of the capping beam. The hook includes a suspension seat cylinder, a hook and an anti-drop sleeve. The upper end of the hook is fixedly connected with a pull rod, and a sliding hole is opened at the center of the bottom of the suspension seat cylinder; The pull rod passes through the sliding hole and extends to the inner side of the suspension seat cylinder, and a limiting block is fixedly connected to the end of the pull rod located inside the suspension seat cylinder; A first spring is arranged on the outer side of the upper part of the pull rod, and both ends of the first spring are respectively in contact with the limiting block and the inner bottom side of the suspension seat cylinder; The anti-drop sleeve is sleeved on the lower part of the pull rod. A second spring is arranged on the outer side of the lower part of the pull rod, and both ends of the second spring are respectively in contact with the hook and the inner top side of the anti-drop sleeve; A pressing assembly is arranged in the middle of the pull rod. The pressing assembly includes a cross bar and two groups of toothed rods; The middle of the cross bar is fixedly connected to the middle of the pull rod. Both ends of the cross bar are rotatably connected with shaft rods, and a gear is fixedly connected to the front end of the shaft rod, and a centrifugal disc is fixedly connected to the rear end of the shaft rod; The upper parts of the toothed rods are fixedly connected to the bottoms on both sides of the suspension seat cylinder, and the toothed rods are in meshing transmission with the gears; The bottom side of the centrifugal disc is in contact with the upper surface of the anti-drop sleeve; Step 3: Move the two overhead cranes forward synchronously on the bridge erection machine, so that the rear end of the I-beam is not blocked by the capping beam; the rear overhead crane slowly lifts, so that the rear end of the I-beam crosses the capping beam; Step 4: The two overhead cranes move backward synchronously, so that the lifted I-beam is inserted into the gap between the 6# beam and the 7# beam on the left side; Step 5: When the front end of the I-beam retreats to a position not affected by the front capping beam, the front overhead crane slowly lifts, so that the front end of the I-beam crosses the capping beam, making the I-beam tend to be horizontal. Finally, adjust the position of the beam slab through the two overhead cranes and lower it into place normally.

2. The construction method for hoisting beam-slab according to claim 1, characterized in that, In Step 1: The two overhead cranes are slidably connected to the upper part of the bridge erection machine, and the two overhead cranes are relatively independently arranged.

3. The construction method for hoisting beam-slab according to claim 1, characterized in that: The steel strand sling ring is a prefabricated structure, and the steel strand sling ring is embedded inside the capping beam; The steel strand sling ring is composed of multiple groups of steel strands, multiple groups of sling steel pipes and a bottom tension plate; The sling steel pipe is sleeved in the middle of the steel strand, and the steel strand and the sling steel pipe are bent to form a U-shaped structure.

4. The construction method for hoisting beam-slab according to claim 3, characterized in that: Both ends of the steel strand are dispersed; The dispersed steel wires at both ends of the steel strand are fixedly connected to the bottom tension plate through steel wire rope clips.

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