Prefabricated box girder lifting appliance

Abstract

The utility model discloses a prefabricated box girder lifting appliance, which relates to the technical field of box girder construction, and comprises a lifting cross beam, a box girder to be lifted, and PVC (polyvinyl chloride) pipelines pre-buried in flange plates on two sides of the box girder to be lifted, and fixed steel bars are mounted on the lifting cross beam. During use, PVC (polyvinyl chloride) pipelines are pre-buried at flange plates on two sides of a to-be-hoisted box girder, after the to-be-hoisted box girder is formed, the fixing steel bars penetrate through the flange plates through the PVC pipelines, the lower ends of the fixing steel bars penetrate through the brackets, and the brackets are fixed at the lower parts of the flange plates. Two sets of devices are arranged on the same to-be-hoisted box girder, so that four hoisting points can be arranged on the to-be-hoisted box girder during hoisting, the operation steps are reduced, the hoisting stability is improved, and the problem that an existing prefabricated box girder hoisting tool is prone to deviation due to uneven stress during use, and consequently the hoisting instability is caused is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to box girder construction technical field especially relates to a prefabricated box girder hoist. BACKGROUND

[0002] The prefabricated box girder refers to the box girder body that the prefabricated box girder is made in advance in production base, is transported to the scene and is constructed by the on-site assembly of transport equipment, generally adopts reinforced concrete, prestressed concrete or other new composite material, and when constructing, the box girder that is prefabricated in independent site can be erected after the completion of lower engineering in combination with bridge erecting machine, can accelerate engineering progress, save construction period, and the cast-in-place box girder is mostly used in large continuous bridge.

[0003] But in the prior art, the conventional box girder hoist adopts the way of calipers and is fixed with the box girder, needs to be fixed and clamped in multiple point positions when hoisting a section of box girder, and simultaneously, since the clamp can only be clamped from the edge of the flange plate of the box girder or is clamped at the two ends of the box girder, therefore, the contact area with the flange plate is small, and the deviation is prone to occurring due to uneven stress, leading to unstable problems during hoisting, therefore, the utility model provides a prefabricated box girder hoist to solve the above problems. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of prefabricated box girder hoists to solve the problems that the existing prefabricated box girder hoist in prior art is prone to deviation due to uneven stress when using, leading to unstable problems during hoisting.

[0005] To achieve the above object, the utility model adopts the following technical scheme: including hoisting crossbeam, and box girder to be hoisted, and PVC pipeline embedded in the flange plate of the box girder to be hoisted two sides, fixed reinforcing bar is installed on the hoisting crossbeam, the bracket is connected in the bottom of fixed reinforcing bar, upper fixed backing plate is nested in fixed reinforcing bar, connecting ring is nested and installed in the middle of hoisting crossbeam.

[0006] Preferably, the fixed reinforcing bar is provided with two groups, respectively arranged at the two ends of the hoisting crossbeam, and the fixed reinforcing bar passes through the through hole formed in the hoisting crossbeam.

[0007] Preferably, the fixed reinforcing bar includes threaded steel bar, and hexagonal sleeve welded and fixed on the upper end of threaded steel bar, and the hexagonal sleeve is provided as a hexagonal column structure.

[0008] Preferably, the bracket includes triangular support, the through hole is formed in the triangular support, and the lower fixed backing plate is welded and fixed on the bottom of the triangular support, and the threaded hole is formed in the lower fixed backing plate.

[0009] Preferably, the bottom of the triangular support is further provided with an anti-drop nut, the anti-drop nut is threadedly connected with the lower end of the threaded steel bar, and the anti-drop nut abuts against the bottom of the lower fixed base plate.

[0010] Preferably, the outer side of the triangular support is welded with a supporting leg.

[0011] Preferably, the top of the triangular support is fixed with a rubber cushion, and the rubber cushion is a rubber pad and is tightly attached to the bottom of the box girder to be hoisted in use.

[0012] Compared with the prior art, the precast box girder hoist has the following advantages and positive effects:

[0013] 1. In the precast box girder hoist, the hoisting cross beam is hung under the hook of the hoisting machine through the connecting ring, PVC pipes are pre-buried at the two side flange plates of the box girder to be hoisted in use, after the box girder to be hoisted is formed, the fixing steel bars are passed through the flange plates through the PVC pipes, the lower end of the fixing steel bar is passed through the bracket, the bracket is fixed at the lower part of the flange plate, two groups of the same device are arranged on the same box girder to be hoisted, so that four lifting points are arranged on one box girder to be hoisted during hoisting, the operation steps are reduced, the stability during hoisting is improved, and the problems that the existing precast box girder hoist is prone to deviation due to uneven force during use and instability during hoisting are solved.

[0014] 2. In the precast box girder hoist, the bottom of the triangular support is lifted through the supporting leg, the distance from the top of the triangular support to the bottom of the box girder to be hoisted is reduced, the time for workers to adjust the position of the triangular support is reduced, the workers are facilitated to operate the anti-drop nut at the bottom of the triangular support, the top of the triangular support is fixed with a rubber cushion, the rubber cushion is tightly attached to the bottom of the box girder to be hoisted in use, the gap between the bottom of the box girder to be hoisted and the triangular support is filled through the rubber cushion, and the bracket will not deviate during hoisting. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A side view of the precast box girder hoist is provided for the precast box girder hoist.

[0016] Figure 2 A front view of the precast box girder hoist is provided for the precast box girder hoist.

[0017] Figure 3 A bracket bottom mounting method of the precast box girder hoist is provided for the precast box girder hoist.

[0018] Figure 4 A hoisting cross beam of the precast box girder hoist is provided for the precast box girder hoist.

[0019] Figure 5The utility model provides a kind of bracket bottom solid structure schematic diagram of prefabricated box girder lifting appliance.

[0020] Legend: 1, hoisting crossbeam; 2, PVC pipeline; 3, fixed steel bar; 31, threaded steel bar; 32, hexagonal sleeve; 4, bracket; 41, triangular support; 42, lower fixed base plate; 43, anti-drop nut; 44, supporting leg; 45, rubber cushion; 5, upper fixed base plate; 6, connecting ring; 7, to be hoisted box girder. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purposes, features and advantages of the utility model, the utility model is further described below in conjunction with the drawings and examples. It should be noted that the examples of the present application and the features in the examples can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, therefore, the utility model is not limited to the specific examples disclosed in the following description.

[0023] As Figures 1-5 shown, the utility model provides a kind of prefabricated box girder lifting appliance, hoisting crossbeam 1, and to be hoisted box girder 7, PVC pipeline 2 embedded in the flange plate of to be hoisted box girder 7 both sides, fixed steel bar 3 is installed on hoisting crossbeam 1, fixed steel bar 3 bottom is connected with bracket 4, and fixed steel bar 3 is nested with upper fixed base plate 5, and connecting ring 6 is nested and installed in the middle of hoisting crossbeam 1;Through fixed steel bar 3 passing through PVC pipeline 2, hoisting crossbeam 1 is connected with bracket 4, so that hoisting crossbeam 1 and bracket 4 are fixed at the top and bottom of to be hoisted box girder 7 respectively, hoisting crossbeam 1 is hung under the hook of hoisting machine through connecting ring 6, when using, first embed PVC pipeline 2 at the flange plate of to be hoisted box girder 7, after to be hoisted box girder 7 is formed, make fixed steel bar 3 pass through flange plate through PVC pipeline 2, the upper end of fixed steel bar 3 is connected with upper fixed base plate 5 by screw thread, and the lower end of fixed steel bar 3 passes through bracket 4 and is connected with lower fixed base plate 42 fixed at the bottom of bracket 4 by screw thread, bracket 4 is fixed at the lower part of flange plate, and the same device will be provided with two groups on the same to be hoisted box girder 7, so that there will be four lifting points on one to be hoisted box girder 7 when hoisting, and the reserved cavity at flange plate is sealed with mortar after hoisting is finished.

[0024] The fixing steel bars 3 are provided with two groups, which are respectively arranged at two ends of the hoisting cross beam 1, pass through the through holes arranged on the hoisting cross beam 1, and connect the hoisting cross beam 1 and the box girder 7 to be hoisted, so that the hoisting cross beam 1 is fixed on the top of the box girder 7 to be hoisted, the box girder 7 to be hoisted is clamped and limited by the hoisting cross beam 1 and the bracket 4, the box girder 7 to be hoisted can be better kept stable after being hoisted, and the falling point position can be controlled by the hoisting cross beam 1 and the bracket 4 after being put down.

[0025] The fixing steel bars 3 include threaded steel bars 31 and hexagonal sleeves 32 welded on the upper ends of the threaded steel bars 31, the hexagonal sleeves 32 are arranged in a hexagonal column structure, the threaded steel bars 31 are conveniently rotated by workers using wrenches and other tools through the hexagonal sleeves 32, so that the lifting appliance is more convenient and labor-saving in operation, the connection between the threaded steel bars 31 and the hoisting cross beam 1 and the bracket 4 is more compact, and the stability of the lifting appliance in use is ensured.

[0026] The bracket 4 includes triangular supports 41, through holes are arranged on the triangular supports 41, and lower fixing base plates 42 are welded on the bottoms of the triangular supports 41 and are provided with threaded holes, the threaded steel bars 31 are connected with the lower fixing base plates 42 through the lower fixing base plates 42 during hoisting, the triangular supports 41 lift the flange plate positions of the box girder 7 to be hoisted from the bottom, the box girder 7 to be hoisted has a larger bottom supporting area after being hoisted, and the box girder 7 to be hoisted is more stable during hoisting and moving.

[0027] The bottoms of the triangular supports 41 are further provided with anti-loosening nuts 43, the anti-loosening nuts 43 are threadedly connected with the lower ends of the threaded steel bars 31, the anti-loosening nuts 43 abut against the bottoms of the lower fixing base plates 42, the threaded steel bars 31 and the lower fixing base plates 42 are reinforced by rotating the anti-loosening nuts 43, the connection between the lower ends of the threaded steel bars 31 and the lower fixing base plates 42 is more stable, the box girder 7 to be hoisted is prevented from tilting due to loosening of the connection between the threaded steel bars 31 and the lower fixing base plates 42 during movement of the lifting appliance after hoisting the box girder 7 to be hoisted, and even a safety hazard is avoided, and the safety of the lifting appliance in use is improved.

[0028] The outer sides of the triangular supports 41 are welded with supporting legs 44, the supporting legs 44 lift the bottoms of the triangular supports 41 away from the ground, the bottoms of the triangular supports 41 are lifted by the supporting legs 44, the distance between the tops of the triangular supports 41 and the bottom of the box girder 7 to be hoisted is reduced, the time for workers to adjust the positions of the triangular supports 41 is reduced, and the workers are facilitated to operate the anti-loosening nuts 43 at the bottoms of the triangular supports 41.

[0029] The top of the triangular support 41 is fixed with a rubber soft pad 45, which is tightly attached to the bottom of the box girder 7 to be hoisted in use, so as to avoid abrasion between the triangular support 41 and the position of the flange plate of the box girder 7 to be hoisted when the box girder 7 to be hoisted is supported. The rubber soft pad 45 is extruded by the bottom of the box girder 7 to be hoisted and the triangular support 41 during hoisting, so as to fill the gap between the bottom of the box girder 7 to be hoisted and the triangular support 41, increase the friction, prevent the box girder 7 to be hoisted from moving and slipping, and reduce the extrusion of the box girder 7 to be hoisted due to the pulling force at the moment of hoisting, so that the box girder 7 to be hoisted can be better protected.

[0030] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields. However, any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments still falls within the protection scope of the present application.

Claims

1. A prefabricated box girder hoist, comprising a hoisting beam (1), a box girder (7) to be hoisted, and PVC pipes (2) embedded in the flange plates on both sides of the box girder (7) to be hoisted, characterized in that: The lifting cross beam (1) is provided with fixed steel bars (3), the bottom of the fixed steel bars (3) is connected with brackets (4), the fixed steel bars (3) are nested with upper fixed base plates (5), and the middle of the lifting cross beam (1) is nested with connecting rings (6).

2. The precast box beam hoist of claim 1, wherein: The fixed steel bars (3) are provided in two groups and are arranged at the two ends of the lifting cross beam (1), and the fixed steel bars (3) pass through through holes arranged on the lifting cross beam (1).

3. The precast box beam hoist of claim 1, wherein: The fixed steel bar (3) comprises a threaded steel bar (31) and a hexagonal sleeve (32) welded on the upper end of the threaded steel bar (31), and the hexagonal sleeve (32) is arranged in a hexagonal column structure.

4. The precast box beam hoist of claim 1, wherein: The bracket (4) comprises a triangular support (41), a through hole is arranged on the triangular support (41), and the bottom of the triangular support (41) is welded with a lower fixed base plate (42), and a threaded hole is arranged on the lower fixed base plate (42).

5. The precast box beam hoist of claim 4, wherein: The bottom of the triangular support (41) is further provided with an anti-loosening nut (43), the anti-loosening nut (43) is threadedly connected with the lower end of the threaded steel bar (31), and the anti-loosening nut (43) abuts against the bottom of the lower fixed base plate (42).

6. The precast box beam hoist of claim 4, wherein: The outer side of the triangular support (41) is welded with a supporting leg (44).

7. The precast box beam hoist of claim 4, wherein: The top of the triangular support (41) is fixed with a rubber cushion (45), which is tightly attached to the bottom of the box girder (7) to be lifted during use.

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