Steel-concrete combined bridge deck prefabricated slab hoisting device without damage to structure

Abstract

The invention discloses a steel-concrete combined bridge deck precast slab hoisting device without damage to a structure, which comprises a connecting sleeve and a main anchor bar assembly prefabricated in a bridge deck slab, the connecting sleeve and the main anchor bar assembly disassemble and fix a movable lifting lug assembly through a connecting anchor bolt, and a round hoisting hole for hoisting is formed in the lifting lug assembly. A reinforcing assembly for structural reinforcement is further arranged in the lifting lug assembly. The problems that concrete at the root of a lifting lug is broken during lifting and a concrete protection layer cannot be recovered after lifting is completed and the lifting lug is cut due to a temporary lifting point made of traditional HPB300 round steel are solved; the movable lifting lug and the anchor bolt can be repeatedly used, and are economical and environment-friendly; the anchor bar assembly is machined in a factory mode, positioning is accurate, and construction is convenient. The device has wide application prospects in hoisting construction of engineering structure concrete members such as precast slabs, precast beams, precast columns and precast piles.

Description

Technical Field

[0001] The invention belongs to the field of bridge spanning systems, and in particular relates to a structurally non-destructive steel-concrete combined bridge deck prefabricated plate hoisting device. Background Art

[0002] Steel-concrete composite deck long-span bridges have good mechanical performance and economy. The concrete slabs of the bridge deck are prefabricated in the factory and cast in place with wet joints after being hoisted into place. During the manufacturing of the prefabricated slabs in the factory, four lifting rings are generally required on each slab so that the prefabricated slabs can be moved to the slab storage slab after curing on the casting pedestal and later hoisted to the longitudinal and transverse beams of the steel structure at the bridge site.

[0003] Traditional lifting rings and embedded bars are formed by integrated bending of HPB300 round steel, and embedded in the steel cage when tying the precast plate reinforcement. The round steel lifting ring is relatively soft and often deforms locally during the lifting process of the crane, causing local fragmentation of the concrete at the root of the lifting ring.

[0004] In addition, after the prefabricated panels are installed, a cutting machine is required to cut off the exposed lifting rings on the surface of the prefabricated panels. The cut surface is flush with the surface of the prefabricated panels. After cutting, the exposed round steel section has no protective layer. During operation, the pavement layer is damaged and easily corroded, affecting the durability of the prefabricated panels. Furthermore, the cut round steel cannot be reused and can only be treated as waste, which is relatively wasteful.

[0005] With the high-quality development of railway construction, this traditional lifting device can no longer meet the current quality requirements. Summary of the invention

[0006] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a steel-concrete combined bridge deck prefabricated plate hoisting device which is non-destructive to the structure.

[0007] The technical solution of the present invention is: a structurally non-destructive steel-concrete combined bridge deck precast panel lifting device, including a connecting sleeve and a main anchor bar assembly prefabricated in the bridge deck, the connecting sleeve and the main anchor bar assembly are used to disassemble and fix a movable lifting ear assembly through connecting anchor bolts, a circular lifting hole for lifting is formed in the lifting ear assembly, and a reinforcement assembly for structural reinforcement is also provided in the lifting ear assembly.

[0008] Furthermore, the lifting ear assembly includes a lifting ear connecting plate, in which a through hole aligned with the fixing assembly is formed, so as to facilitate the passage of the connecting anchor bolt.

[0009] Furthermore, a lifting ear pull plate is provided on the lifting ear connecting plate, and a circular lifting hole is opened in the lifting ear pull plate.

[0010] Furthermore, the lifting eye connecting plate and the lifting eye pulling plate are vertical.

[0011] Furthermore, the reinforcement assembly includes a tension reinforcement plate, and the tension reinforcement plate is fixed between the upper end of the lifting ear connecting plate and the outer side of the lifting ear pulling plate.

[0012] Furthermore, the reinforcement component includes a lifting hole reinforcement plate, and the lifting hole reinforcement plate is arranged on both sides of the lifting ear pull plate.

[0013] Furthermore, the connecting sleeve and main anchor bar assembly includes a connecting sleeve, and a threaded end of the connecting sleeve is not higher than the bridge deck.

[0014] Furthermore, a protective layer rubber gasket is provided between the connecting sleeve and the lifting ear connecting plate.

[0015] Furthermore, the lower end of the connecting sleeve is connected to the main anchor bar, and the main anchor bar is J-shaped.

[0016] Furthermore, secondary anchor bars are provided between adjacent main anchor bars to connect the two.

[0017] The beneficial effects of the present invention are as follows: The present invention separately arranges the connecting sleeve and anchor bar assembly embedded in the ear assembly and the precast plate; before casting the precast plate, the connecting sleeve and the anchor bar assembly are directly embedded in the steel cage, and a natural rubber gasket is pasted on the top of the connecting sleeve; the thickness of the gasket meets the requirements of the steel bar protective layer of the precast plate; when casting concrete, the gasket hole is pasted and covered with transparent tape to prevent the connecting sleeve from being blocked by mortar.

[0018] The movable lifting ear assembly of the present invention is welded by steel plates, and connecting bolt holes are arranged on the connecting plate, and the bolt hole spacing is consistent with the connecting sleeve assembly. When moving and hoisting the prefabricated plate, the movable lifting ear assembly and the pre-buried connecting sleeve are connected by anchor bolts, and hoisted by a special hanger. After the hoisting is completed, the connecting anchor bolts and rubber washers are removed, and the connecting sleeve holes are sealed and smoothed by high-strength epoxy mortar.

[0019] The present invention avoids the problems of concrete fragmentation at the base of the lifting lug during lifting and the inability to restore the concrete protective layer after the lifting lug is cut after lifting, which are caused by temporary lifting points made of traditional HPB300 round steel. The movable lifting lug and anchor bolt can be reused, which is economical and environmentally friendly. The anchor bar assembly is processed in a factory, with accurate positioning and convenient construction.

[0020] The device of the present invention has a relatively broad application prospect in the hoisting construction of engineering structure concrete components such as precast panels, precast beams, precast columns, and precast piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the elevation structure of a single hoisting device in the present invention; Figure 2It is a plan view of a movable lifting ear assembly of a single lifting device in the present invention; Figure 3 It is a plan view of a connection sleeve and an anchor bar assembly of a single hoisting device in the present invention; Figure 4 It is a plan view schematic diagram of four sets of the devices of the present invention arranged on a whole bridge deck prefabricated plate; in: 1 Movable lifting lug assembly 2 Connecting anchor bolt 3 Protective layer rubber gasket 4 Connecting sleeve and main anchor bar assembly 5 Transverse distribution anchor bars 1-1 lifting lug pull plate 1-2 lifting lug connecting plate 1-3 Tensile reinforcement plate 1-4 Hanging hole reinforcement plate 1-5 round lifting holes 1-6 anchor bolt connection holes 4-1 Connecting sleeve 4-2 Main anchor bar 4-3 secondary anchor bars. DETAILED DESCRIPTION

[0022] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 4 As shown, a structurally non-destructive steel-concrete combined bridge deck precast panel lifting device includes a connecting sleeve and a main anchor bar assembly 4 prefabricated in the bridge deck, and the connecting sleeve and the main anchor bar assembly 4 are used to disassemble and fix a movable lifting ear assembly 1 through a connecting anchor bolt 2. Circular lifting holes 1-5 for lifting are formed in the lifting ear assembly 1, and a reinforcement assembly for structural reinforcement is also provided in the lifting ear assembly 1.

[0023] The lifting ear assembly 1 comprises a lifting ear connecting plate 1 - 2 , in which a through hole aligned with the fixing assembly is formed, so as to facilitate the passage of the connecting anchor bolt 2 .

[0024] The lifting ear connecting plate 1-2 is provided with a lifting ear pull plate 1-1, and a circular lifting hole 1-5 is opened in the lifting ear pull plate 1-1.

[0025] The lifting ear connecting plate 1-2 and the lifting ear pulling plate 1-1 are perpendicular to each other.

[0026] The reinforcement assembly includes a tension reinforcement plate 1-3, and the tension reinforcement plate 1-3 is fixed between the upper end of the lifting ear connecting plate 1-2 and the outer side of the lifting ear pulling plate 1-1.

[0027] The reinforcement assembly includes a lifting hole reinforcement plate 1-4, and the lifting hole reinforcement plate 1-4 is arranged on both sides of the lifting ear pull plate 1-1.

[0028] The connecting sleeve and main anchor bar assembly 4 includes a connecting sleeve 4-1, and the threaded end of the connecting sleeve 4-1 is not higher than the bridge deck.

[0029] A protective layer rubber gasket 3 is also provided between the connecting sleeve 4 - 1 and the lifting ear connecting plate 1 - 2 .

[0030] The lower end of the connecting sleeve 4-1 is connected to the main anchor bar 4-2, and the main anchor bar 4-2 is J-shaped.

[0031] A secondary anchor bar 4-3 is provided between adjacent main anchor bars 4-2 to connect the two.

[0032] Specifically, the secondary anchor bar 4-3 is U-shaped, and two adjacent main anchor bars 4-2 are arranged back to back, and the U-shaped secondary anchor bar 4-3 is arranged between the two, thereby connecting the two.

[0033] Specifically, the transverse sections of the main anchor bars 4 - 2 and the secondary anchor bars 4 - 3 are connected to the transverse distributed anchor bars 5 in the bridge deck.

[0034] Specifically, the movable lifting ear assembly 1 is a composite component formed by welding steel plates, including a lifting ear pull plate 1-1, a lifting ear connecting plate 1-2, a tension reinforcement plate 1-3, a lifting hole reinforcement plate 1-4, a lifting hole 1-5, and an anchor bolt connecting hole 1-6.

[0035] Corresponding to the structure, the movable lifting lug assembly 1 can be removed and reused after the prefabricated bridge deck slab is hoisted.

[0036] It should be noted that the effective length of the connecting anchor bolt 2 screwed into the connecting sleeve 4 - 1 should not be less than 1.5 times the anchor bolt diameter.

[0037] Specifically, the connecting sleeve and main anchor bar assembly 4 is a welded assembly, including a connecting sleeve 4-1, a main anchor bar 4-2, and a secondary anchor bar 4-3.

[0038] More specifically, the transverse distributed anchor bars 5 are cross-welded with the main anchor bars 4 - 2 and the auxiliary anchor bars 4 - 3 .

[0039] Specifically, the thickness of the protective layer rubber gasket 3 is consistent with the thickness of the steel bar protective layer of the bridge deck precast slab, the central circular hole is consistent with the diameter of the connecting anchor 2, and it is bonded to the top surface of the connecting sleeve 4-1 before the bridge deck precast slab is cast.

[0040] Specifically, the protective layer rubber gasket 3 should be removed after the precast bridge deck slab is hoisted, and the gasket 3 hole and the connecting sleeve 4-1 hole should be sealed and smoothed with high-strength epoxy mortar.

[0041] The present invention separately arranges the connecting sleeve and anchor bar assembly embedded in the ear assembly and the precast plate; before casting the precast plate, the connecting sleeve and the anchor bar assembly are directly embedded in the steel cage, and a natural rubber gasket is pasted on the top of the connecting sleeve; the thickness of the gasket meets the requirements of the steel bar protective layer of the precast plate; when casting concrete, the gasket hole is pasted and covered with transparent tape to prevent the connecting sleeve from being blocked by mortar.

[0042] The movable lifting ear assembly of the present invention is welded by steel plates, and connecting bolt holes are arranged on the connecting plate, and the bolt hole spacing is consistent with the connecting sleeve assembly. When moving and hoisting the prefabricated plate, the movable lifting ear assembly and the pre-buried connecting sleeve are connected by anchor bolts, and hoisted by a special hanger. After the hoisting is completed, the connecting anchor bolts and rubber washers are removed, and the connecting sleeve holes are sealed and smoothed by high-strength epoxy mortar.

[0043] The present invention avoids the problems of concrete fragmentation at the base of the lifting lug during lifting and the inability to restore the concrete protective layer after the lifting lug is cut after lifting, which are caused by temporary lifting points made of traditional HPB300 round steel. The movable lifting lug and anchor bolt can be reused, which is economical and environmentally friendly. The anchor bar assembly is processed in a factory, with accurate positioning and convenient construction.

[0044] The device of the present invention has a relatively broad application prospect in the hoisting construction of engineering structure concrete components such as precast panels, precast beams, precast columns, and precast piles.

Claims

1. A structurally harmless steel-concrete composite bridge deck precast slab hoisting device, characterized by: The invention comprises a connecting sleeve and a main anchor bar assembly (4) prefabricated in a bridge deck, wherein the connecting sleeve and the main anchor bar assembly (4) are used to disassemble and fix a movable lifting lug assembly (1) via a connecting anchor bolt (2), wherein a circular lifting hole (1-5) for lifting is formed in the lifting lug assembly (1), and a reinforcement assembly for structural reinforcement is also provided in the lifting lug assembly (1).

2. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 1 is characterized by: The lifting ear assembly (1) comprises a lifting ear connecting plate (1-2), in which a through hole aligned with the fixing assembly is formed, thereby facilitating the passage of a connecting anchor bolt (2).

3. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 2 is characterized by: The lifting eye connection plate (1-2) is provided with a lifting eye pull plate (1-1), and a circular lifting hole (1-5) is formed in the lifting eye pull plate (1-1).

4. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 3 is characterized by: The lifting eye connecting plate (1-2) and the lifting eye pulling plate (1-1) are perpendicular.

5. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 3 is characterized by: The reinforcement assembly comprises a tension reinforcement plate (1-3), and the tension reinforcement plate (1-3) is fixed between the upper end of the lifting eye connection plate (1-2) and the outer side of the lifting eye pulling plate (1-1).

6. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 3 is characterized by: The reinforcement assembly comprises a lifting hole reinforcement plate (1-4), and the lifting hole reinforcement plate (1-4) is arranged on both sides of the lifting ear pull plate (1-1).

7. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 1 is characterized by: The connecting sleeve and main anchor bar assembly (4) comprises a connecting sleeve (4-1), wherein the threaded end of the connecting sleeve (4-1) is not higher than the bridge deck.

8. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 7 is characterized by: A protective layer rubber gasket (3) is also provided between the connecting sleeve (4-1) and the lifting ear connecting plate (1-2).

9. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 7 is characterized by: The lower end of the connecting sleeve (4-1) is connected to the main anchor bar (4-2), and the main anchor bar (4-2) is J-shaped.

10. The structurally harmless steel-concrete composite bridge deck precast slab hoisting device according to claim 9, characterized in that: Auxiliary anchor bars (4-3) are provided between adjacent main anchor bars (4-2) to connect the two.

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