CN113605247A - Flange type steel box arch springing consolidation structure and construction method - Google Patents
Flange type steel box arch springing consolidation structure and construction method Download PDFInfo
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- CN113605247A CN113605247A CN202110980511.4A CN202110980511A CN113605247A CN 113605247 A CN113605247 A CN 113605247A CN 202110980511 A CN202110980511 A CN 202110980511A CN 113605247 A CN113605247 A CN 113605247A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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Abstract
The invention discloses a flange type steel box arch foot consolidation structure, which comprises an arch ring foundation and an arch ring first arch section, wherein arch seat reinforced concrete is arranged between the arch ring foundation and the arch ring first arch section, and a lower flange plate is arranged in the arch seat reinforced concrete; the bottom of the arch ring head arch section is fixedly provided with an upper flange plate which is embedded and arranged on the top of the arch base reinforced concrete; an arch hinge structure is arranged between the upper flange plate and the lower flange plate, and a plurality of bolt holes are respectively and uniformly formed correspondingly and are connected with high-strength bolt assemblies. The invention also discloses a construction method of the consolidation structure. The invention can effectively solve the problems of difficult welding operation, overlarge welding deformation, uncontrollable welding residual stress, easy burning of arch support concrete, further influenced durability and the like easily caused by the existing arch ring welding extension consolidation scheme, and can realize the consolidation of the lower base plate of the arch hinge structure and the consolidation of the arch ring only by additionally arranging part of high-strength bolt assemblies without adding other structural materials.
Description
Technical Field
The invention belongs to the field of bridge engineering construction, and particularly relates to a flange type steel box arch springing consolidation structure and a construction method.
Background
The development history of the arch bridge is long, the arch bridge still occupies an important position in the bridge engineering of modern highways and urban roads, the arch ring of the arch bridge is mainly made of reinforced concrete, steel boxes, steel pipe concrete and the like, and the steel box arch fully utilizes the excellent tension-compression performance of steel materials to be higher in the arch bridge.
The common construction method of the steel box arch bridge comprises the steps of hoisting arch rings in sections, fixing the arch rings by cable-stayed buckling and hanging and folding the arch rings, in the process, temporary hinging is often arranged at the arch foot position in order to obtain ideal arch ring line shape and initial stress, and consolidation operation is carried out after the arch ring line shape is corrected and folded. The operation can lead the bare arch to enter the next procedure in a zero bending moment state, and is an important means for saving the construction cost and ensuring the bridge line shape.
The sealing and consolidation operation of the temporary hinge joint of the arch end generally extends an arch ring to an embedded steel plate of an arch hinge base in a manner of welding an embedded section, and the scheme has the following defects:
1. the arch ring generally adopts closed steel box, and inside is equipped with more vertical stiffening, if divide four board units to weld, then the wallboard welding seam of last group board unit takes shape the degree of difficulty great, and inboard stiffening energy can't be executed and weld.
2. If a manhole or a handhole is opened for welding operation, unnecessary damage to the structure is caused at the arch springing part with the largest stress.
3. The arch ring wall plate, the end plate and the hinged support steel plate at the arch springing part have larger thickness, the welding deformation and the residual stress of the arch ring at the embedding section are difficult to eliminate, and the safety storage of the arch ring is possibly reduced.
4. When the embedding section and the hinged support steel plate are welded, the arch support concrete is easily damaged by high-temperature firing, and the durability of the structure is adversely affected.
Disclosure of Invention
Aiming at the problems that the welding operation is difficult, the welding deformation is overlarge, the welding residual stress is uncontrollable and the arch center concrete is easy to be burned to further influence the durability easily caused by the existing arch ring welding extension consolidation scheme in the background technology, the invention provides a flange type steel box arch foot consolidation structure and a construction method, wherein the lower base plate consolidation and the arch ring consolidation of the arch hinge structure can be realized only by additionally arranging a part of high-strength bolt assemblies without adding other structural materials.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention relates to a flange type steel box arch foot consolidation structure, which comprises an arch ring foundation and an arch ring initial arch section, wherein arch seat reinforced concrete is arranged between the arch ring foundation and the arch ring initial arch section, and a lower flange plate is arranged in the arch seat reinforced concrete; the bottom of the arch ring head arch section is fixedly provided with an upper flange plate which is embedded and arranged on the top of the arch base reinforced concrete; an arch hinge structure is arranged between the upper flange plate and the lower flange plate, and a plurality of bolt holes are respectively and uniformly formed correspondingly and are connected with high-strength bolt assemblies.
Furthermore, the arch center reinforced concrete is composed of first-stage arch center concrete and second-stage arch center concrete, arch center structural steel bars are arranged in the first-stage arch center concrete and the second-stage arch center concrete, and the lower flange plate and the upper flange plate are respectively embedded and arranged on the tops of the first-stage arch center concrete and the second-stage arch center concrete.
Further, the high-strength bolt assembly comprises an outer hexagonal full-tooth high-strength screw, the head of the outer hexagonal full-tooth high-strength screw is arranged in the first-stage arch abutment concrete, and the screw of the outer hexagonal full-tooth high-strength screw sequentially penetrates through corresponding bolt holes in the lower flange plate and the upper flange plate; and a lower nut and an upper nut which are matched with the outer hexagonal full-tooth high-strength screw are arranged on the outer hexagonal full-tooth high-strength screw at intervals, the upper nut and the lower nut are respectively positioned on the upper surfaces of the upper flange plate and the lower flange plate, and the upper flange plate and the second-stage arch abutment concrete and the lower flange plate and the first-stage arch abutment concrete are fastened.
Furthermore, the arch base reinforced concrete is provided with a plurality of layers of screw positioning reinforcing mesh, and each layer of screw positioning reinforcing mesh is fixedly connected with each high-strength bolt assembly respectively and used for positioning each high-strength bolt assembly.
Furthermore, the arch hinge structure comprises an arch hinge lower lug plate and an arch hinge upper lug plate which are respectively and fixedly connected with the upper surface of the lower flange plate and the lower surface of the upper flange plate, and the arch hinge lower lug plate and the arch hinge upper lug plate are respectively provided with corresponding arch hinge pin holes and are fixedly connected through hinge pins.
Further, the high-strength bolt assembly is a 10.9S-level high-strength bolt assembly.
Further, the lower flange plate and the upper flange plate are made of Q345 steel plates, and the thickness of the lower flange plate and the upper flange plate is 20 mm-50 mm.
Further, the screw positioning reinforcing mesh is 3 layers.
Another technical solution to solve the technical problem of the present invention is as follows:
the invention discloses a construction method of a flange type steel box arch springing consolidation structure, which comprises the following steps:
step one, first-stage arch support concrete pouring: binding arch base structural steel bars and a plurality of layers of screw positioning reinforcing mesh on an arch ring foundation, then pre-embedding and installing each outer hexagonal full-tooth high-strength screw, positioning and fixing each layer of screw positioning reinforcing mesh according to each bolt hole position on a lower flange plate, welding an arch hinge lower lug plate on the lower flange plate and installing each outer hexagonal full-tooth high-strength screw in place in an aligning way, pouring first-stage arch base concrete in a vertical mold, after concrete construction is finished, installing a lower nut on each outer hexagonal full-tooth high-strength screw and screwing, and fastening the lower flange plate with the first-stage arch base concrete;
step two, positioning and hinging the arch ring head arch section: welding and fixing an arch ring initial arch section and an upper flange plate, welding an arch hinge upper lug plate on the lower surface of the upper flange plate, hoisting the arch ring initial arch section, aligning and installing each bolt hole of the upper flange plate with each outer hexagonal full-tooth high-strength screw rod, aligning and adjusting the position of an arch hinge pin hole of the arch hinge upper lug plate with an arch hinge pin hole of the arch hinge lower lug plate, and then driving a hinge pin to form a hinge system;
step three, pouring concrete of the second-stage arch support: after hoisting the arch sections of the arch ring in place and adjusting the line shape of the arch ring in a buckling and hanging state, mounting upper nuts on the outer hexagonal full-tooth high-strength screws, primarily screwing matched buckling ropes to primarily position the initial arch section of the arch ring, binding reinforcing steel bars of second-stage arch abutment concrete, pouring the second-stage arch abutment concrete in a vertical mold, and finally screwing the upper nuts after the concrete reaches the design strength to protect exposed steel members, so that the arch foot consolidation construction is finished.
Further, the distance between the reinforcing meshes positioned adjacent to the screw rods is 20 cm.
Compared with the prior art, the flange type steel box arch springing consolidation structure and the construction method have the advantages that the consolidation structure is novel and unique in design and simple and reasonable in structure, the fixing of the arch hinge lower base plate (namely the lower flange plate) and the arch ring consolidation can be realized under the condition that other structural materials are not added by arranging the high-strength bolt assemblies between the upper flange plate and the lower flange plate, the construction method is matched, simplicity and practicability are realized, large changes are not needed on the basis of the original structure, steel plate members necessary for installing the arch hinge are fully utilized, a large amount of steel consumption and welding operation are avoided, the construction operation is extremely simple and convenient, and the engineering quality is easily ensured.
Drawings
FIG. 1 is a schematic structural view of a flange-type steel box arch springing consolidation structure of the present invention;
FIG. 2 is a schematic perspective view of the arch foot consolidation structure of the flange steel box of the present invention;
in the figure: 1. an arch ring foundation; 2. an arch ring head arch section; 3. arch base reinforced concrete; 31. first-stage abutment concrete; 32. second-stage abutment concrete; 4. a lower flange plate; 5. an upper flange plate; 6. a high-strength bolt assembly; 61. an outer hexagonal full-tooth high-strength screw; 62. a lower nut; 63. an upper nut; 7. positioning the reinforcing mesh by the screw; 8. an arch hinge structure; 81. an arch hinge lower ear plate; 82. an upper lug plate of the arch hinge; 83. and (4) hinging pins.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "upper", "lower", "left", "right", "front", "rear", and the like used in the specification and claims of the present disclosure are used only to indicate relative positional relationships, and when the absolute position of a described object is changed, the relative positional relationships are changed accordingly; the terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The present invention is not described in detail, but is known to those skilled in the art.
Example 1:
referring to fig. 1 and 2, the flange-type steel box arch springing consolidation structure of the present invention includes an arch ring foundation 1 and an arch ring first arch section 2, wherein the arch ring foundation 1 is used for installing an arch ring of an arch bridge and bearing a load transmitted by the arch ring, a longitudinal stiffener is disposed in the arch ring, the arch ring is generally hoisted in sections, and the initial section of the arch ring is the arch ring first arch section 2; an arch bed reinforced concrete 3 is arranged between the arch ring foundation 1 and the arch ring head arch section 2, and a lower flange plate 4 is arranged in the arch bed reinforced concrete 3; the bottom of the arch ring head arch section 2 is welded with an upper flange plate 5, and the upper flange plate 5 is embedded on the top of the arch base reinforced concrete 3 and is tightly contacted with the arch base reinforced concrete 3; an arch hinge structure 8 is arranged between the upper flange plate 5 and the lower flange plate 4, a plurality of bolt holes are correspondingly and uniformly formed in the upper flange plate and the lower flange plate respectively, and a high-strength bolt assembly 6 is connected to the upper flange plate and the lower flange plate; the arch hinge structure 8 comprises an arch hinge lower ear plate 81 and an arch hinge upper ear plate 82 which are fixedly connected with the upper surface of the lower flange plate 4 and the lower surface of the upper flange plate 5 respectively, and the arch hinge lower ear plate 81 and the arch hinge upper ear plate 82 are respectively provided with corresponding arch hinge pin holes and are fixedly connected through a hinge pin 83. In this embodiment, the upper flange plate 5, that is, the end steel plate of the first arch segment of the arch ring, is made of a material consistent with that of the main arch ring, and is mostly made of Q345 steel, the thickness of the upper flange plate is mainly related to the stress of the arch bridge, and generally, a steel plate of 25mm to 50mm is adopted, a bolt hole is pre-drilled at the position of the high-strength bolt assembly 6 designed according to the construction drawing during blanking, the upper surface of the bolt hole is welded with the wall plate and the longitudinal stiffening plate of the first arch segment 2 of the arch ring, and the lower surface of the bolt hole is welded with the arch hinge upper ear plate 82 to serve as an upper seat plate of the arch hinge structure 8; the lower flange plate 4 is made of a material consistent with that of the upper flange plate 5, is mostly made of Q345 steel, has a thickness related to the bearing load of the arch hinge seat plate during installation of a bare arch, generally adopts a steel plate with a thickness of 25 mm-50 mm, pre-drills bolt holes according to the designed high-strength bolt positions during blanking, and is welded with the arch hinge lower lug plate 81 on the upper surface to form the lower seat plate of the arch hinge structure 8.
In order to facilitate the construction of the flange type steel box arch foot consolidation structure, the arch base reinforced concrete 3 consists of first-stage arch base concrete 31 and second-stage arch base concrete 32, arch base structural steel bars are arranged in the first-stage arch base concrete 31 and the second-stage arch base concrete 32 respectively, the first-stage arch base concrete 31 and the second-stage arch base concrete 32 are poured in sequence during construction, the lower flange plate 4 and the upper flange plate 5 are respectively embedded and arranged at the tops of the first-stage arch base concrete 31 and the second-stage arch base concrete 32, and the lower surfaces of the first-stage arch base concrete 31 and the second-stage arch base concrete 32 are respectively in close contact with each other.
Preferably, the high-strength bolt assembly 6 in this embodiment is a 10.9S-level high-strength bolt assembly, which is made of more materials such as 45 # steel, 40 b steel, 20 mn-ti-b steel, 35CrMoA and the like, and includes an outer hexagonal full-tooth high-strength screw 61, the head of the outer hexagonal full-tooth high-strength screw 61 is placed in the first-stage abutment concrete 31, and the screw of each outer hexagonal full-tooth high-strength screw 61 sequentially passes through corresponding bolt holes on the lower flange plate 4 and the upper flange plate 5; the outer hexagonal full-tooth high-strength screw 61 is provided with a lower nut 62 and an upper nut 63 at intervals, the lower nut 62 and the upper nut 63 are matched with the outer hexagonal full-tooth high-strength screw 61, the upper nut 63 and the lower nut 62 are respectively positioned on the upper surfaces of the upper flange plate 5 and the lower flange plate 4 and are used for fastening the upper flange plate 5 and the second-stage arch abutment concrete 32 and the lower flange plate 4 and the first-stage arch abutment concrete 31, and gaskets are usually arranged between the two nuts and the flange plates. In this embodiment, the length of the outer hexagonal full-tooth high-strength screw 61 should meet the requirements of secondary screwing, arch hinge dimension and first-stage arch abutment concrete anchoring, and the arrangement number is based on the structural stress calculation requirement.
In order to facilitate the positioning of each high-strength bolt assembly 6 in the first-stage arch support concrete 31, a plurality of layers of screw positioning reinforcing mesh 7, preferably 3 layers, are arranged in the first-stage arch support concrete 31, the interlayer spacing can be set to 20mm, the specification of C16 is usually adopted, the mesh spacing is set according to the standard high-strength bolt spacing, each layer of screw positioning reinforcing mesh 7 is bound with the arch support structural reinforcing steel, and meanwhile, each layer of screw positioning reinforcing mesh 7 is fixedly connected with each outer hexagonal full-tooth high-strength bolt 61 respectively and is used for accurately positioning each high-strength bolt assembly 6, so that the deviation of each outer hexagonal full-tooth high-strength bolt 61 is prevented when the first-stage arch support concrete 31 is poured.
Example 2:
embodiment 1 provides a construction method of a flange type steel box arch springing consolidation structure, which includes the following steps:
step one, pouring concrete of a first-stage arch support; binding arch base structural steel bars and each layer of screw positioning reinforcing mesh 7 on an arch ring foundation 1, controlling the distance between every two adjacent screw positioning reinforcing meshes 7 to be 20cm, then pre-embedding and installing each outer hexagonal full-tooth high-strength screw 61 and positioning and fixing according to each bolt hole position on a lower flange plate 4 by using each layer of screw positioning reinforcing mesh 7; welding the arch hinge lower lug plate 81 to the upper surface of the lower flange plate 4, aligning each bolt hole on the lower flange plate 4 with each outer hexagonal full-tooth high-strength screw 61, installing in place, pouring the first-stage arch abutment concrete 31 by a vertical mold, filling and compacting a gap between the lower flange plate and the first-stage arch abutment concrete by a grouting mode if necessary, discharging air, installing and screwing a lower nut 62 on each outer hexagonal full-tooth high-strength screw 6 after concrete construction is finished, and fastening the lower flange plate 4 and the first-stage arch abutment concrete 31;
secondly, positioning and hinging the arch section of the arch ring head; welding and fixing the arch ring first arch section 2 and the upper surface of the upper flange plate 5, welding the arch hinge upper lug plate 82 on the lower surface of the upper flange plate 5, hoisting the arch ring first arch section 2, aligning and installing each bolt hole of the upper flange plate 5 with each outer hexagonal full-tooth high-strength screw 61, aligning and adjusting the arch hinge pin hole of the arch hinge upper lug plate 82 with the arch hinge pin hole of the arch hinge lower lug plate 81, and then driving a hinge pin 83 to form a hinge system;
step three, pouring concrete of the second-stage arch support; after hoisting the arch sections of the arch ring in place and adjusting the line shape of the arch ring in a buckling and hanging state, mounting upper nuts 63 on outer hexagonal full-tooth high-strength screws 61, primarily screwing matched buckling ropes to primarily position an arch ring head arch section 2, binding reinforcing steel bars of second-stage arch abutment concrete 32, vertically pouring the second-stage arch abutment concrete 32, and finally screwing the upper nuts 63 after the concrete reaches the design strength to protect exposed steel members, wherein the arch foot consolidation construction is finished.
Before the construction method of the embodiment is used for construction, firstly, stress calculation and structural design of an arch bridge are carried out, and main structural parameters, a foundation form, construction procedures and the like of an arch ring are determined; designing the specification and the number of each high-strength bolt assembly according to the arch segment anchoring force required by the bridge forming operation; according to the stress parameters of main components of each construction step, completing the design of an arch hinge structure, and determining the arrangement of each high-strength bolt assembly of the arch hinge seat plate; determining the length of the high-strength bolt according to the arch concrete mark number and the bolt specification; designing the size of a screw positioning reinforcing mesh; and designing the thicknesses of the upper flange plate and the lower flange plate according to the arch end and arch foot pressure parameters and designing bolt hole positions according to the arrangement of the high-strength bolt assemblies.
In the embodiment, the welding of the upper flange plate and the arch ring head arch section as well as the welding of the arch hinge upper lug plate and the welding of the lower flange plate and the arch hinge lower lug plate are finished in a factory, and the welding operation is not carried out on site; the exposed part of the high-strength bolt assembly can be provided with a decorative cap or sealed and protected by epoxy resin gravel concrete; the arch hinge structure is enclosed in the concrete arch support, and the hinge pin and other components are not taken out.
The flange type steel box arch foot consolidation structure and the construction method are suitable for various types of steel boxes, steel box trusses, concrete-filled steel tube arch bridges and the like, are particularly suitable for arch bridges with single steel box arch ring structures, and when the flange type steel box arch foot consolidation structure is used for the concrete-filled steel tube arch bridges, the shape of a flange plate and the arrangement of bolts need to be properly adjusted in combination with arch ring parameters.
The invention is not suitable for concrete box arches, and when the invention is used for arch bridges without taking temporary hinging procedures into account in construction schemes, the flange connection scheme of the invention can be adopted, but secondary screwing of high-strength bolts is not needed.
In summary, the flange type steel box arch foot consolidation structure and the construction method can be widely applied to the construction of steel box arch bridges, steel box truss arch bridges and steel pipe concrete arch bridges, the arch support concrete is poured in two stages only by adding the high-strength bolt assembly arranged according to the stress requirement and positioning by means of the multi-layer screw positioning reinforcing mesh in the arch support concrete, the high-strength bolt assembly is installed by drilling holes on the steel plate (upper flange plate) at the head arch section end of the arch ring and the steel plate (lower flange plate) below the arch hinge, the consolidation strength of the arch hinge and the arch support is ensured by two screwing operations, and the consolidation requirement of the arch ring and the arch support is met. The invention is practical and simple, makes full use of the steel plate member necessary for installing the arch hinge, avoids a large amount of steel consumption and welding operation, has extremely simple and convenient construction operation, easily ensures the engineering quality, and avoids the defects of difficult welding operation, overlarge welding deformation, uncontrollable welding residual stress and impact on durability caused by burning of arch abutment concrete, which are possibly brought by an arch ring welding extension consolidation scheme. The method is applied to a plurality of actual bridge projects, and after each bridge is built, the bridge arch foot consolidation structure operates well till now without any defects, so that the method has good economic and social benefits and strong practicability.
Claims (10)
1. The utility model provides a flange formula steel box arch foot concreties and constructs, includes arch ring basis (1) and arch ring first arch section (2), its characterized in that: an arch bed reinforced concrete (3) is arranged between the arch ring foundation (1) and the arch ring head arch section (2), and a lower flange plate (4) is arranged in the arch bed reinforced concrete (3); an upper flange plate (5) is fixedly arranged at the bottom of the arch ring head arch section (2), and the upper flange plate (5) is embedded in the top of the arch base reinforced concrete (3); an arch hinge structure (8) is arranged between the upper flange plate (5) and the lower flange plate (4), and a plurality of bolt holes are correspondingly and uniformly formed in the upper flange plate and the lower flange plate respectively and are connected with a high-strength bolt assembly (6).
2. The flange-type steel box arch springing consolidation structure of claim 1, wherein: the arch support reinforced concrete (3) is composed of first-stage arch support concrete (31) and second-stage arch support concrete (32), arch support structural steel bars are arranged in the first-stage arch support concrete (31) and the second-stage arch support concrete (32), and the lower flange plate (4) and the upper flange plate (5) are respectively embedded in the tops of the first-stage arch support concrete (31) and the second-stage arch support concrete (32).
3. The flange-type steel box arch springing consolidation structure of claim 2, wherein: the high-strength bolt assembly (6) comprises an outer hexagonal full-tooth high-strength screw rod (61), the head of the outer hexagonal full-tooth high-strength screw rod (61) is arranged in the first-stage arch abutment concrete (31), and the screw rods of the outer hexagonal full-tooth high-strength screw rod (61) sequentially penetrate through corresponding bolt holes in the lower flange plate (4) and the upper flange plate (5); the outer hexagonal full-tooth high-strength screw (61) is provided with a lower nut (62) and an upper nut (63) at intervals, the lower nut (62) and the upper nut (63) are matched with the outer hexagonal full-tooth high-strength screw (61), the upper nut (63) and the lower nut (62) are respectively positioned on the upper surfaces of the upper flange plate (5) and the lower flange plate (4), and the upper flange plate (5) is fastened with second-stage arch abutment concrete (32) and the lower flange plate (4) is fastened with first-stage arch abutment concrete (31).
4. A flange-type steel box arch springing consolidation structure as set forth in claims 1 to 3, wherein: the arch support reinforced concrete (3) is provided with a plurality of layers of screw positioning reinforcing mesh (7), and each layer of screw positioning reinforcing mesh (7) is fixedly connected with each high-strength bolt assembly (6) respectively and used for positioning each high-strength bolt assembly (6).
5. The flange-type steel box arch springing consolidation structure of claim 4, wherein: the arch hinge structure (8) comprises an arch hinge lower lug plate (81) and an arch hinge upper lug plate (82) which are fixedly connected with the upper surface of the lower flange plate (4) and the lower surface of the upper flange plate (5) respectively, and the arch hinge lower lug plate (81) and the arch hinge upper lug plate (82) are provided with corresponding arch hinge pin holes respectively and are fixedly connected through hinge pins (83).
6. The flange-type steel box arch springing consolidation structure of claim 5, wherein: the high-strength bolt assembly (6) is a 10.9S-level high-strength bolt assembly.
7. A flanged steel box arch springing consolidation structure as set forth in claim 4 or 5, characterized in that: the lower flange plate (4) and the upper flange plate (5) are made of Q345 steel plates and have the thickness of 20-50 mm.
8. The flange-type steel box arch springing consolidation structure of claim 7, wherein: the screw positioning reinforcing mesh (7) is 3 layers.
9. A construction method of a flange type steel box arch springing consolidation structure comprises the following steps:
step one, pouring concrete of a first-stage arch support; binding arch base structural steel bars and a plurality of layers of screw positioning steel bar nets (7) on an arch ring foundation (1), then pre-embedding and installing all outer hexagonal full-tooth high-strength screws (61), positioning and fixing the outer hexagonal full-tooth high-strength screws according to the positions of bolt holes on a lower flange plate (4) by utilizing all layers of screw positioning steel bar nets (7), welding an arch hinge lower lug plate (81) on the lower flange plate (4), aligning all outer hexagonal full-tooth high-strength screws (61) and installing in place, pouring first-stage arch base concrete (31) in a vertical mold, after concrete construction is completed, installing lower nuts (62) on all outer hexagonal full-tooth high-strength screws (6) and screwing, and fastening the lower flange plate (4) and the first-stage arch base concrete (31);
secondly, positioning and hinging the arch section of the arch ring head; welding and fixing an arch ring head arch section (2) and an upper flange plate (5), welding an arch hinge upper lug plate (82) on the lower surface of the upper flange plate (5), hoisting the arch ring head arch section (2), aligning and installing each bolt hole of the upper flange plate (5) with each outer hexagonal full-tooth high-strength screw (61), aligning and adjusting the position of an arch hinge pin hole of the arch hinge upper lug plate (82) with an arch hinge pin hole of an arch hinge lower lug plate (81), and then driving a hinge pin (83) to form a hinge system;
step three, pouring concrete of the second-stage arch support; after hoisting each arch segment of the arch ring in place and adjusting the line shape of the arch ring in a buckling and hanging state, mounting upper nuts (63) on each outer hexagonal full-tooth high-strength screw (61) and primarily screwing matched buckling cables to primarily position the first arch segment (2) of the arch ring, binding reinforcing steel bars of second-stage arch seat concrete (32), vertically pouring the second-stage arch seat concrete (32), and finally screwing each upper nut (63) after the concrete reaches the design strength to protect exposed steel members, wherein the arch foot consolidation construction is finished.
10. The construction method of the flange type steel box arch springing consolidation structure of claim 9, wherein: the distance between adjacent screw positioning reinforcing meshes (7) is 20 cm.
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| CN114990987A (en) * | 2022-05-25 | 2022-09-02 | 中建五局第三建设有限公司 | Steel box multi-arch springing structure and construction method |
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