CN111172856B - Middle-bearing type longitudinal block prefabricated box girder - Google Patents
Middle-bearing type longitudinal block prefabricated box girder Download PDFInfo
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- CN111172856B CN111172856B CN202010202591.6A CN202010202591A CN111172856B CN 111172856 B CN111172856 B CN 111172856B CN 202010202591 A CN202010202591 A CN 202010202591A CN 111172856 B CN111172856 B CN 111172856B
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- 238000009423 ventilation Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 16
- 238000009434 installation Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 239000000428 dust Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009417 prefabrication Methods 0.000 abstract description 3
- 238000004062 sedimentation Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000011065 in-situ storage Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000011150 reinforced concrete Substances 0.000 description 4
- 238000009415 formwork Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000009432 framing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/067—Flat continuous joints cast in situ
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a middle-bearing type longitudinal block prefabricated box girder, wherein a Z-shaped longitudinal girder A and a Z-shaped longitudinal girder B are oppositely arranged, sedimentation steps are arranged at two ends of the Z-shaped longitudinal girder A and the Z-shaped longitudinal girder B, the two ends of the Z-shaped longitudinal girder A and the Z-shaped longitudinal girder B are connected through end cross girders, the bottoms of the Z-shaped longitudinal girder A, Z between the two end cross girders are connected through a bottom plate wet seam, superimposed sheets are mutually assembled on the steps at the upper parts of the Z-shaped longitudinal girder A and the Z-shaped longitudinal girder B, and a top plate post-pouring layer is poured on an upper cavity formed by the Z-shaped longitudinal girder A, Z and the superimposed sheets. The beneficial effects of the invention are as follows: the process has the advantages of realizing batch prefabrication of factories and manufacturing of a small part of operation sites, improving construction efficiency, improving labor environment of workers, reducing influence on municipal road traffic interference and urban environment dust and noise pollution, and being low in requirements on transportation and installation equipment and low in site conditions and line conditions, so that the process can be flexibly applied to urban overhead interval structures.
Description
Technical Field
The invention relates to the technical field of box girder erection, in particular to a middle-bearing type longitudinal block prefabricated box girder.
Background
The box girder is divided into a prefabricated box girder and a cast-in-situ box girder. The prefabricated box girder can be prefabricated by whole holes or transverse sections, and is erected or spliced on site by using large-scale transportation equipment and a bridge girder erection frame after the lower engineering is completed, so that the construction progress is quick, the on-site operation time is short, the turnover utilization rate of bridge girder erection machine equipment is considered, and the overhead girder is required to be continuously over 10 km. The cast-in-situ box girder can be completed by adopting a movable sliding mode or a mode of setting up a full framing on site, all operation sites are completed, the site operation time is long, and particularly the full framing system has great influence on municipal roads and urban environments. The material is mainly a prestressed reinforced concrete box girder, a steel box girder and a steel-concrete combined girder. The prestressed reinforced concrete box girder is constructed on site, and besides longitudinal prestress, transverse prestress is arranged on some of the prestressed reinforced concrete box girders; the steel box girder is generally processed in a factory and then transported to a site for installation, and has an all-steel structure and also has a part of reinforced concrete pavement layers.
The existing prefabricated box girder is erected by a large bridge girder erection machine during construction, the turnover utilization rate of bridge girder erection machine equipment is considered, the overhead bridge girder is required to be continuously over 10 km, the prefabricated box girder is inconvenient to transport in areas with complex terrains and inconvenient traffic, a prefabricated girder field is difficult to construct, such as hills and mountain urban areas, the traditional prefabricated box girder process is difficult to be adopted for the overhead section box girder with shorter length, the cast-in-situ process is intelligently adopted, the field operation time of each cross box girder is required to be about 2 months, the influence on municipal roads is large, and the construction period is long.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the middle-bearing type longitudinal split precast box girder which has short field construction period, convenient box girder erection and low continuous length requirement on an elevated section, and each precast member monomer can realize a self-stabilizing balance state.
The aim of the invention is achieved by the following technical scheme: the middle-bearing type longitudinal block prefabricated box girder comprises a Z-shaped longitudinal girder A, Z B, a superimposed sheet, a bottom plate wet seam, end cross beams and a top plate post-pouring layer, wherein the Z-shaped longitudinal girder A and the Z-shaped longitudinal girder B are oppositely arranged, settling steps are arranged at two ends of the Z-shaped longitudinal girder A and the Z-shaped longitudinal girder B, the two ends of the Z-shaped longitudinal girder A and the Z-shaped longitudinal girder B are connected through the end cross beams, the bottoms of the Z-shaped longitudinal girder A, Z-shaped longitudinal girder B between the two end cross beams are connected through the bottom plate wet seam, the superimposed sheet is mutually spliced on the steps at the upper parts of the Z-shaped longitudinal girder A and the Z-shaped longitudinal girder B, and the top plate post-pouring layer is poured on a cavity formed by the Z-shaped longitudinal girder A, Z-shaped longitudinal girder B and the superimposed sheet.
Preferably, a plurality of inverted T-shaped longitudinal beams are further arranged between the Z-shaped longitudinal beam A and the Z-shaped longitudinal beam B, gaps between the bottoms of the inverted T-shaped longitudinal beams and the bottoms of the Z-shaped longitudinal beams A are connected through bottom plate wet joints, and gaps between the bottoms of the inverted T-shaped longitudinal beams and the bottoms of the Z-shaped longitudinal beams B are connected through bottom plate wet joints, and the tops of the inverted T-shaped longitudinal beams are propped against the bottoms of the laminated plates.
Preferably, the Z-shaped longitudinal beam A and the Z-shaped longitudinal beam B are respectively provided with a bottom plate, a web plate and a flange, the heights of the beam bottoms of the Z-shaped longitudinal beam A and the Z-shaped longitudinal beam B are smaller than those of the cross section of the middle part of the beam, two uneven transverse baffles are arranged at two ends of the Z-shaped longitudinal beam A and the Z-shaped longitudinal beam B, the uneven transverse baffles form a settlement step, and gaps between the corresponding transverse baffles and the bottom plates between the Z-shaped longitudinal beam A and the Z-shaped longitudinal beam B are connected through post-pouring wet joints.
Preferably, the joint of the web plate and the upper surface of the flange is provided with a step, and two ends of the laminated plate are positioned on the step.
Preferably, the top of the outer side of the flange of the Z-shaped longitudinal beam is provided with a convex edge, and the upper surface of the post-pouring layer of the top plate is not higher than the upper surface of the convex edge.
Preferably, the superimposed sheet is a flat or arched sheet, the top surface of the laminated slab is provided with connecting steel bars.
Preferably, the bottom plate is provided with a plurality of through holes.
Preferably, the web is provided with a plurality of ventilation holes.
Preferably, gaps between the bottom plates of the Z-shaped longitudinal beam A and the Z-shaped longitudinal beam B are connected by adopting post-cast strips, and the post-cast strips are connected with end cross beams.
Preferably, both ends of the bottom plate are provided with prestressed anchorage toothed plates as required.
The invention has the following advantages: according to the middle-bearing type longitudinal block prefabricated box girder, the traditional box girder is longitudinally divided into two symmetrical Z-shaped longitudinal girders and a top laminated slab, an inverted T-shaped longitudinal girder can be additionally arranged if necessary, the split component monomers have light dead weight, and the prefabricated, transportation and hoisting can be performed by adopting conventional engineering equipment; in order to realize the self-stabilization goal of the Z-shaped longitudinal beam during construction, the height of the cross section of the beam in the range of the support at the beam end is reduced, the cross section is bracket-shaped, and the box beam is of a middle bearing structure after a bridge is formed; during installation, the longitudinal beam can be directly erected on a support of the lower structure to form an operation platform for later-stage cast-in-situ construction, and the formwork support is prevented from being erected. Prefabricating the Z-shaped longitudinal beam and the inverted T-shaped longitudinal beam and the superimposed sheet by adopting factory flow production; the engineering machinery is adopted to hoist in place rapidly, and all prefabricated components are connected into a whole span box girder by wet joints; the process for prefabricating the humidifying joint realizes that most of operations are completed in a factory, and a small part of operations are completed in the field, so that the construction efficiency is improved, the labor environment of workers is improved, and the influence on the urban road traffic interference and the urban environment dust and noise pollution is reduced. After the prefabricated part and the lower structure are completed, the installation of the longitudinal beams to form an operation platform can be completed only by conventional equipment, then the longitudinal beams are used as the operation platform to pour the end cross beams, the wet joints of the bottom plates, the laminated plates are installed, and the top plate post-pouring layer is poured on the laminated plates, so that the erection of the box girder is realized. The process has lower requirements on transportation and installation equipment and lower site conditions and line conditions, so the process can be flexibly applied to urban overhead interval structures.
Drawings
Fig. 1 is a schematic structural view of a Z-shaped stringer a;
FIG. 2 is a schematic view of the installation of Z-stringers A and B;
Fig. 3 is a front view of the Z-shaped stringer a;
FIG. 4 is a schematic cross-sectional view of A-A of FIG. 3;
FIG. 5 is a schematic cross-sectional view of B-B of FIG. 3;
FIG. 6 is a schematic cross-sectional view of D-D of FIG. 3;
FIG. 7 is a schematic view of an installation of an inverted T-shaped stringer;
In the figure, 1-Z-shaped longitudinal beams A, 2-Z-shaped longitudinal beams B, 3-bottom plate wet joints, 4-end cross beams, 5-laminated plates, 6-top plate post-pouring layers, 7-settlement steps, 8-transverse plates, 9-inverted T-shaped longitudinal beams, 11-bottom plates, 12-webs, 13-flanges, 14-ribs, 15-ventilation holes, 16-through holes, 17-toothed plates and 18-steps.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present invention and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in figures 1-6, the middle-bearing type longitudinal block prefabricated box girder comprises a Z-shaped longitudinal girder A1, a Z-shaped longitudinal girder B2, a laminated plate 5, a bottom plate 11 wet joint 3, an end cross beam 4 and a top plate post-pouring layer 6, wherein the Z-shaped longitudinal girder A1 and the Z-shaped longitudinal girder B2 are oppositely arranged, the Z-shaped longitudinal girder A1, the Z-shaped longitudinal girder B2 and the laminated plate 5 are all subjected to factory prefabrication processing, and are transported to a site for installation after being processed, a work shed can be built at a construction site, prefabrication of the Z-shaped longitudinal girder A1, the Z-shaped longitudinal girder B2 and the laminated plate 5 is completed in the work shed, sedimentation steps 7 are arranged at two ends of the Z-shaped longitudinal girder A1 and the Z-shaped longitudinal girder B2, particularly, the Z-shaped longitudinal girder A1 and the Z-shaped longitudinal girder B2 are respectively provided with the bottom plate 11, a web 12 and a flange 13, the web 12 are arranged in an outward-inclined manner, so that the heights of the beam bottoms of the Z-shaped longitudinal girder A1 and the Z-shaped longitudinal girder B2 are smaller than the height of the cross section of the middle part of the girder is smaller, two ends of the Z-shaped longitudinal beam A1 and the Z-shaped longitudinal beam B2 are provided with two transverse baffles 8 with uneven heights, wherein the height of the transverse baffles 8 at the outer side is smaller than that of the transverse baffles 8 at the inner side, so that the transverse baffles 8 with uneven heights form a settlement step 7,Z, gaps between the corresponding transverse baffles 8 and a bottom plate 11 between the longitudinal beam A1 and the Z-shaped longitudinal beam B2 are connected through post-pouring wet joints, after the pouring of wet joints at the bottom plate 11 and the transverse baffles 8 is completed, the Z-shaped longitudinal beam A1 and the Z-shaped longitudinal beam B2 form a cofferdam-shaped structure, the top surface of a beam end support is positioned in the waist area of the cross section of the whole box beam and is in a bracket shape, namely, the beam end support is supported on the settlement step 7, and therefore, the Z-shaped longitudinal beam is self-stable during construction, and the box beam after bridge formation is in a middle-bearing structure; during installation, the longitudinal beam can be directly erected on a support of the lower structure to form an operation platform for later-stage cast-in-situ construction, and the formwork support is prevented from being erected.
In this embodiment, as shown in fig. 1 to 5, two ends of a Z-shaped longitudinal beam A1 and a Z-shaped longitudinal beam B2 are connected through an end cross beam 4, the end cross beam 4 and a bottom plate 11 are connected together through a wet joint 3 to ensure the connection strength of the Z-shaped longitudinal beam A1 and the Z-shaped longitudinal beam B2, when the Z-shaped longitudinal beam A1 and the Z-shaped longitudinal beam B2 are prefabricated, part of the cross beam can be prefabricated integrally with the Z-shaped longitudinal beam, further, a post-cast strip is also cast between the Z-shaped longitudinal beam A1 and the Z-shaped longitudinal beam B2, the post-cast strip is connected with the inner side of the end cross beam 4, and when casting, the end cross beam 4 and the post-cast strip can be cast together.
In this embodiment, as shown in fig. 6, the laminated plate 5 is spliced and installed between the Z-shaped longitudinal beam A1 and the Z-shaped longitudinal beam B2, and the laminated plate 5 is located above the end cross beam 4, further, the connection between the web 12 and the upper surface of the flange 13 is provided with a step 18, two ends of the laminated plate 5 are located on the step 18, and the laminated plate 5 is a flat plate or an arch plate, preferably, the laminated plate 5 is an arch plate, and has high structural strength and strong bearing capacity compared with that of the flat plate.
In this embodiment, as shown in fig. 6, the top plate post-cast layer 6 is poured between the Z-shaped longitudinal beam A1, the superimposed sheet 5 and the Z-shaped longitudinal beam B2, further, the top of the outer side of the flange 13 is provided with a rib 14, the upper surface of the top plate post-cast layer 6 is not higher than the upper surface of the rib 14, preferably, the upper surface of the top plate post-cast layer 6 is flush with the upper surface of the rib 14, and mortar liquid is not easy to overflow through the rib 14, so that the pouring of the top plate post-cast layer 6 is convenient.
In this embodiment, as shown in fig. 1, a plurality of through holes 16 are formed in the bottom plate 11, the through holes 16 are used for hoisting a wet joint template of the bottom plate during construction, accumulated water in the box girder is drained as a drainage hole during operation, and further, a plurality of ventilation holes 15 are formed in the web 12, and the ventilation holes 15 can ventilate, so that when a cross wind occurs, the ventilation holes 15 can ventilate, thereby balancing air pressure on the inner side and the outer side of the box girder, guaranteeing the reliability of the use of the box girder, and properly adjusting the hole sites if contradiction exists between the prestressed bundles or common steel bars.
In this embodiment, as shown in fig. 3, toothed plates 17 are attached to both ends of the base plate 11 to receive concentrated loads when the bridge system is converted and tensioned.
In this embodiment, the Z-shaped longitudinal beams A1, B2 and the superimposed sheet 5 are prefabricated in a factory or a beam field, then transported to a construction site for hoisting, after the Z-shaped longitudinal beams A1 and B2 are respectively installed on corresponding supports, the end cross beam 4 and the bottom plate 11 are poured first, the post-cast strip can be poured together with the end cross beam 4, then the superimposed sheet 5 is hoisted, and finally the top plate post-cast layer 6 is poured.
In this embodiment, as shown in fig. 7, when the beam width is larger, a plurality of inverted T-shaped stringers 9 need to be added between the Z-shaped stringers A1 and the Z-shaped stringers B2, that is, a plurality of inverted T-shaped stringers 9 are disposed between the Z-shaped stringers A1 and the Z-shaped stringers B2, gaps between the bottoms of the inverted T-shaped stringers 9 and the bottoms of the Z-shaped stringers A1 are connected through the bottom plate 11 wet seams 3, gaps between the bottoms of the inverted T-shaped stringers 9 and the bottoms of the Z-shaped stringers B2 are connected through the bottom plate 11 wet seams 3, and the top of the inverted T-shaped stringers 9 are propped against the bottom of the superimposed sheet 5, through the inverted T-shaped stringers 9, so that the longitudinally segmented prefabricated box girder can be applied to box girders with larger beam widths.
The middle-bearing type longitudinal block prefabricated box girder longitudinally divides the traditional box girder into two symmetrical Z-shaped longitudinal beams and a top superimposed sheet 5, and an inverted T-shaped longitudinal beam 9 can be additionally arranged if necessary, and the split component monomers have light dead weight and can be prefabricated, transported and hoisted by adopting conventional engineering equipment; in order to realize the self-stabilization goal of the Z-shaped longitudinal beam during construction, the height of the cross section of the beam in the range of the support at the beam end is reduced, the cross section is bracket-shaped, and the box beam is of a middle bearing structure after a bridge is formed; during installation, the longitudinal beam can be directly erected on a support of the lower structure to form an operation platform for later-stage cast-in-situ construction, and the formwork support is prevented from being erected. Prefabricating the Z-shaped longitudinal beams, the inverted T-shaped longitudinal beams 9 and the superimposed sheet 5 by adopting factory flow production; the engineering machinery is adopted to hoist in place rapidly, and all prefabricated components are connected into a whole span box girder by wet joints; the process for prefabricating the humidifying joint realizes that most of operations are completed in a factory, and a small part of operations are completed in the field, so that the construction efficiency is improved, the labor environment of workers is improved, and the influence on the urban road traffic interference and the urban environment dust and noise pollution is reduced. After the prefabricated part and the lower structure are completed, the installation of the longitudinal beams to form an operation platform can be completed only by conventional equipment, then the longitudinal beams are used as the operation platform to pour the end cross beams 4, the bottom plates 11 to form wet joints 3, the laminated plates 5 are installed, and the top plate post-pouring layer 6 is poured on the laminated plates 5, so that the erection of the box girders is realized. The process has lower requirements on transportation and installation equipment and lower site conditions and line conditions, so the process can be flexibly applied to urban overhead interval structures.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (8)
1. The middle-bearing type longitudinal block prefabricated box girder is characterized in that: including Z shape longeron A, Z shape longeron B, superimposed sheet, bottom plate wet joint, end crossbeam, roof post-cast layer, Z shape longeron A with Z shape longeron B sets up for opposite directions, Z shape longeron A with Z shape longeron B's both ends are provided with subsides step, just Z shape longeron A with Z shape longeron B's beam bottom is passed through end crossbeam is connected, is located between the crossbeam of both ends Z shape longeron A Z shape longeron B's bottom passes through the bottom plate wet joint connects, superimposed sheet is assembled each other Z shape longeron A with Z shape longeron B upper portion's step is last, roof post-cast layer is pour Z shape longeron A Z shape longeron B with on the superimposed sheet forms upper portion cavity, Z shape longeron A and Z shape longeron B all have bottom plate, web and edge of a wing, Z shape longeron B's beam bottom is less than beam middle part height, Z shape longeron A with Z shape longeron B's has the step height to be less than two steps of two, the bottom plate height is not level to be located on the superimposed sheet and the top plate, the top plate is located the horizontal support is formed to the top plate, the top plate is connected.
2. The center-supported longitudinally segmented precast box girder of claim 1, wherein: a plurality of inverted T-shaped longitudinal beams are further arranged between the Z-shaped longitudinal beams A and B, the bottoms of the inverted T-shaped longitudinal beams are connected with the bottoms of the Z-shaped longitudinal beams A through bottom plate wet joints, the bottoms of the inverted T-shaped longitudinal beams are connected with the bottoms of the Z-shaped longitudinal beams B through bottom plate wet joints, and the tops of the inverted T-shaped longitudinal beams are propped against the bottoms of the laminated plates.
3. The center-supported longitudinally segmented precast box girder of claim 1, wherein: and the top of the outer side of the flange of the Z-shaped longitudinal beam is provided with a convex edge, and the upper surface of the post-pouring layer of the top plate is not higher than the upper surface of the convex edge.
4. A center-supported longitudinally segmented precast box girder as claimed in claim 3, wherein: the superimposed sheet is dull and stereotyped or arched plate, and superimposed sheet top surface is equipped with the connecting reinforcement.
5. The middle-support type longitudinal split precast box girder according to claim 4, wherein: the bottom plate is provided with a plurality of through holes.
6. The middle-support type longitudinal split precast box girder according to claim 5, wherein: the web plate is provided with a plurality of ventilation holes.
7. The center-supported longitudinally segmented precast box girder of claim 6, wherein: and gaps among bottom plates of the Z-shaped longitudinal beam A and the Z-shaped longitudinal beam B are connected by adopting a post-cast strip, and the post-cast strip is connected with the end cross beam.
8. The center-supported longitudinally segmented precast box girder of claim 7, wherein: the two ends of the bottom plate are provided with prestressed anchorage toothed plates according to the requirement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010202591.6A CN111172856B (en) | 2020-03-20 | 2020-03-20 | Middle-bearing type longitudinal block prefabricated box girder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010202591.6A CN111172856B (en) | 2020-03-20 | 2020-03-20 | Middle-bearing type longitudinal block prefabricated box girder |
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| CN111172856A CN111172856A (en) | 2020-05-19 |
| CN111172856B true CN111172856B (en) | 2024-08-23 |
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| CN211947880U (en) * | 2020-03-20 | 2020-11-17 | 重庆市轨道交通设计研究院有限责任公司 | Half-through type longitudinal block prefabricated box girder |
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| AU2003259613A1 (en) * | 2002-11-01 | 2004-05-20 | Bridge & Marine Engineering Pty. Ltd. | Structural Beam and Method of Manufacture |
| CN201567530U (en) * | 2009-12-25 | 2010-09-01 | 万水 | Assembly-type combined box girder and component unit body |
| CN203200643U (en) * | 2013-03-27 | 2013-09-18 | 郑州市大方实业有限公司 | Double-splicing mode combined bridge structure |
| CN103388303A (en) * | 2013-08-07 | 2013-11-13 | 河南省交通规划勘察设计院有限责任公司 | Horizontal splicing corrugated steel web plate combined box girder and construction method |
| CN105064198B (en) * | 2015-07-30 | 2018-01-05 | 苏交科集团股份有限公司 | Semi-prefabricated assembled corrugated steel web plate combined box girder and preparation method thereof |
| CN106320162B (en) * | 2016-08-22 | 2018-01-26 | 上海应用技术学院 | Prefabricated assembled cover beam structure and construction method using steel shear key |
| CN108396630A (en) * | 2018-04-28 | 2018-08-14 | 上海市城市建设设计研究总院（集团）有限公司 | The big box-beam structure of precast concrete with the connection of wet seam direction across bridge |
| CN109487707A (en) * | 2018-12-28 | 2019-03-19 | 东南大学 | A kind of precast assembly expanded letter box beam and its assembling method |
| CN210086022U (en) * | 2019-04-17 | 2020-02-18 | 长沙市公路桥梁建设有限责任公司 | Assembled single-box multi-chamber corrugated steel web box girder |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211947880U (en) * | 2020-03-20 | 2020-11-17 | 重庆市轨道交通设计研究院有限责任公司 | Half-through type longitudinal block prefabricated box girder |
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Address after: Building 1, No. 19 Wealth Avenue, North New District, Chongqing, 400000 (No. 3, 4, 5, and 6, 8th floor, Building A, No. 3 Wealth Park, Chongqing High tech) Patentee after: CHONGQING RAIL TRANSIT DESIGN AND RESEARCH INSTITUTE Co.,Ltd. Country or region after: China Patentee after: Chongqing Monorail Transit Engineering Group Co.,Ltd. Address before: Building 1, No. 19 Wealth Avenue, North New District, Chongqing, 400000 (No. 3, 4, 5, and 6, 8th floor, Building A, No. 3 Wealth Park, Chongqing High tech) Patentee before: CHONGQING RAIL TRANSIT DESIGN AND RESEARCH INSTITUTE Co.,Ltd. Country or region before: China Patentee before: CHONGQING MONORAIL TRAFFIC ENGINEERING CO.,LTD. |