CN112030729A - Prefabricated bridge pier and bearing platform connecting system for assembled beam bridge and construction method of prefabricated bridge pier and bearing platform connecting system - Google Patents
Prefabricated bridge pier and bearing platform connecting system for assembled beam bridge and construction method of prefabricated bridge pier and bearing platform connecting system Download PDFInfo
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- CN112030729A CN112030729A CN202010867712.9A CN202010867712A CN112030729A CN 112030729 A CN112030729 A CN 112030729A CN 202010867712 A CN202010867712 A CN 202010867712A CN 112030729 A CN112030729 A CN 112030729A
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000004593 Epoxy Substances 0.000 claims abstract description 11
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 235000014121 butter Nutrition 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- 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
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4157—Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The application provides a prefabricated bridge pier and bearing platform connecting system of an assembled beam bridge and a construction method of the prefabricated bridge pier and bearing platform connecting system, and belongs to the technical field of building parts of roads, railways or bridges. Including prefabricated pier, cushion cap, steel member, locating plate, fastener and epoxy, epoxy is located between steel member and the locating plate, and the fastener runs through steel member and locating plate, and fastener one end is fixed with the cushion cap, and the other end is fixed with prefabricated pier. The construction method is applied to beam bridge construction, and has the advantages of simple structure, convenience in assembly, high implementation speed and the like.
Description
Technical Field
The application relates to a prefabricated bridge pier and bearing platform connecting system of an assembled beam bridge and a construction method of the prefabricated bridge pier and the bearing platform connecting system, and belongs to the technical field of building parts of roads, railways or bridges.
Background
With the further advance of bridge industrialization, the traditional construction mode of casting all on site is gradually changed into a construction mode of prefabricating a part or most of components in factories and then transporting the prefabricated components to the site for installation, and compared with the traditional construction method, the industrial production mode firstly solves the problem of connection among the prefabricated components. In the process of bridge industrialization, an upper structure is earlier than a lower structure, the bridge industrialization mainly refers to the industrialization of the lower structure at present, namely a bearing platform, a pier and a capping beam, the bearing platform is less prefabricated and mainly adopts a cast-in-place mode, and the bearing platform is generally connected with the pier mainly in an assembling mode.
At present, the connection form between the bearing platform and the prefabricated bridge pier mainly adopts sleeve connection, and the splicing connection method has the following two defects:
on the one hand, the splicing mode of the sleeve connection usually needs to embed a steel bar connecting sleeve in the prefabricated section of the bearing platform and the pier, and in order to ensure that the connection performance between the bearing platform and the pier is reliable, a large number of steel bar connecting sleeves need to be embedded in the bearing platform or the pier, so that the cost for manufacturing the pier upright column is greatly improved.
On the other hand, the prefabricated assembly mode of the embedded steel bar connecting sleeve has higher requirements on construction precision and grouting quality, and has severe requirements on accurate positioning and grouting among all parts in the assembly construction process, and the grouting compactness in the sleeve is difficult to detect, so that the sleeve connecting method is limited in practical engineering application.
Disclosure of Invention
In view of this, the present application first provides an assembly type bridge pier and cushion cap connection system, and the system overcomes the problems of the sleeve connection system, and realizes the connection by bolts, and has the advantages of simple structure, convenient assembly, fast implementation process, and the like.
Specifically, the method is realized through the following scheme:
the utility model provides an assembled beam bridge prefabricated pier and cushion cap connected system, includes prefabricated pier, cushion cap, steel member, locating plate, fastener and epoxy, and epoxy is located between steel member and the locating plate, and the fastener runs through steel member and locating plate, and fastener one end is fixed with the cushion cap, and the other end is fixed with prefabricated pier.
According to the prefabricated bridge pier and bearing platform connecting system of the assembly type beam bridge, steel members are installed at the connecting ends of the prefabricated bridge piers when the bridge piers are prefabricated; when the bearing platform is poured, the fastening piece is pre-embedded in the bearing platform, so that one end of the fastening piece is fixed with the bearing platform, meanwhile, in order to ensure the accurate position, the fastening piece can be fixed by a positioning plate, and the other end (also called a connecting end) of the fastening piece is protected; before the prefabricated bridge pier is installed, an epoxy resin layer is laid on a positioning plate of a bearing platform, then the periphery of the bearing platform is connected by adopting a fastening piece, and the bearing platform and the prefabricated bridge pier can be integrally formed by means of the fastening piece. The steel member is installed at the link of prefabricated pier to expose the part to the steel member and carry out anticorrosive treatment. When the bearing platform is poured, one end of each fastener is pre-embedded in the bearing platform, the fasteners are fixed by the positioning plates, and the pre-embedding depth and the number of the fasteners are determined by the existing standard calculation method. The connecting system is simple in structure and convenient and fast to construct, can realize assembly type construction, and avoids the defects that the quality of slurry is difficult to control and the grouting compactness is difficult to detect and the like in the traditional sleeve connection.
Further, as preferable:
the steel member comprises bolt box, end plate and connecting plate, and the end plate is located prefabricated pier one end towards the cushion cap (being called the link), and one side that the end plate was towards prefabricated pier is fixed with connecting plate and bolt box, and the bolt box is sealed, and the fastener passes through the bolt box to be connected with prefabricated pier, and the connecting plate is perpendicular with the end plate, and the end plate opposite side lays the epoxy layer. More preferably, the connecting plate is provided with an opening, and the opening is provided with a reinforcing rib. The connecting plate sets up a plurality of, and the trompil is provided with a plurality of to improve the joint strength of steel member and prefabricated pier, specifically according to the bearing capacity that the bridge pier designed, confirm through current standard calculation method. The sizes and the structures of the prefabricated bridge pier, the bearing platform, the steel component, the positioning plate, the fastening piece, the epoxy resin layer and the bolt box are arranged and are determined through the existing standard calculation according to the structural form.
The fastener is the bolt, and the screw rod of bolt is fixed in the cushion cap, and wired one end is located prefabricated pier as the link. More preferably, the threaded end of the bolt is located in the bolt box to facilitate the installation of the nut.
The positioning plate is provided with an opening, the opening is arranged along the periphery of the positioning plate, the periphery of the fastening piece is connected, and the bearing platform and the prefabricated pier are integrated; reinforcing steel bars are arranged in the open holes to serve as reinforcing ribs, and the number of the open holes and the number of the reinforcing ribs are multiple; correspondingly, holes are reserved on the periphery of the end plate, and the holes are multiple and are determined by the existing standard calculation method according to the designed bearing capacity of the bridge pier. Before the prefabricated bridge pier is installed, an epoxy resin layer is laid on a positioning plate of a bearing platform, then the periphery of a fastener is connected, and the pretightening force of the fastener is determined according to the existing standard.
Meanwhile, the application also provides a construction method of the connection form of the prefabricated bridge pier and the bearing platform of the assembly type girder bridge, which comprises the following process steps:
1) binding a bearing platform steel bar on a construction site, installing a positioning plate, embedding a fastener, pouring bearing platform concrete, and maintaining to the designed strength;
2) processing a steel member according to a design drawing, performing anti-corrosion treatment on the steel member, fixing the steel member in the prefabricated bridge pier when the bridge pier is prefabricated, and exposing the bolt box and the end plate on the butt joint side of the prefabricated bridge pier;
3) according to design requirements, inserting reinforcing steel bars into the openings of the connecting plates to serve as reinforcing ribs, installing pier templates after pier reinforcing steel bars are manufactured, pouring pier concrete, maintaining piers, and removing the pier template system after the strength of concrete slabs is achieved;
4) the prefabricated bridge pier is transported to a construction site, and an epoxy resin layer is laid on a positioning plate of the bearing platform;
5) hoisting the prefabricated bridge pier, inserting the prefabricated bridge pier into the reserved hole through the embedded fastener after the prefabricated bridge pier is installed in place, penetrating through the end plate, and connecting the prefabricated bridge pier with the bearing platform through the embedded fastener;
6) and after the fasteners are firmly connected, coating butter on the exposed fasteners, and sealing the bolt box.
Compared with the prior art, the invention has the following beneficial effects:
(1) construction is convenient, and the installation is simple. Compared with the traditional grouting sleeve connection, the steel member can be butted with the steel reinforcement framework of the prefabricated pier at one time, and the speed is high; the prefabricated pier is transported to the job site, lays the epoxy layer on the locating plate of cushion cap, and hoist and mount the back in place, is connected two prefabricated piers through the fastener, and easy operation adopts rapid Assembly ization construction, practices thrift the cost, reduces the wet operation work of on-the-spot grout, and is little to the surrounding environment pollution.
(2) The detection means is simple, and the quality is convenient to control. Compared with the traditional grouting sleeve connection, the connection system reduces the hidden operation link of grouting, does not need to detect the quality of grouting material and the grouting compactness, and can control the quality of a connection node.
(3) The construction speed is improved, and the construction cost is saved. Compared with the traditional grouting sleeve connection, the connecting system greatly reduces the use of engineering materials and construction operation links, simplifies construction operation procedures, accelerates construction speed and saves construction cost.
Drawings
FIG. 1 is a floor plan view of the connection structure of the present application;
FIG. 2 is a top view of a steel component of the present application;
FIG. 3 is a side view of a steel component of the present application;
fig. 4 is a top view of the positioning plate of the present application.
Wherein: 1. prefabricating a bridge pier; 2. a bearing platform; 3. a steel member; 4. a fastener; 5. an epoxy resin layer; 6. a bolt box; 7. positioning a plate; 71. a hole; 8. an end plate; 9. a connecting plate; 91. and (6) opening holes.
Detailed Description
This embodiment introduces a prefabricated pier and cushion cap connected system of assembled beam bridge at first, combines figure 1, including prefabricated pier 1, cushion cap 2, steel member 3, locating plate 7, fastener 4 and epoxy 5, epoxy 5 is located between steel member 3 and locating plate 7, and fastener 4 runs through steel member 3 and locating plate 7, and 4 one ends of fastener are fixed with cushion cap 2, and the other end is fixed with prefabricated pier 1.
In the prefabricated bridge pier and bearing platform connecting system of the assembly type beam bridge, the steel member 3 is arranged at the connecting end of the prefabricated bridge pier 1 when the bridge pier 1 is prefabricated; when the bearing platform 2 is poured, the fastening piece 4 is pre-embedded in the bearing platform 2, so that one end of the fastening piece 4 is fixed with the bearing platform 2, meanwhile, in order to ensure the accurate position, the fastening piece 4 can be fixed by the positioning plate 7, and the other end (also called as a connecting end) of the fastening piece 4 is protected; before the prefabricated pier 1 is installed, an epoxy resin layer 5 is laid on a positioning plate 7 of a bearing platform 2, then the periphery of the bearing platform 2 is connected by adopting a fastening piece 4, and the bearing platform 2 and the prefabricated pier 1 can be integrated by means of the fastening piece 4. The steel member 3 is installed at the connection end of the prefabricated pier 1, and the exposed part of the steel member 3 is subjected to anti-corrosion treatment. When the bearing platform 2 is poured, one end of each fastener 4 is pre-embedded in the bearing platform 2, the fasteners 4 are fixed well through the positioning plates 7, and the pre-embedding depth and the number of the fasteners 4 are determined through the existing standard calculation method. The connecting system is simple in structure and convenient and fast to construct, can realize assembly type construction, and avoids the defects that the quality of slurry is difficult to control and the grouting compactness is difficult to detect and the like in the traditional sleeve connection.
Meanwhile, the application also provides a construction method of the prefabricated bridge pier and bearing platform connecting system of the assembly type girder bridge, which comprises the following process steps:
1) binding reinforcing steel bars of the bearing platform 2 on a construction site, installing a positioning plate 7, embedding a fastener 4, pouring concrete of the bearing platform 2, and maintaining to design strength;
2) processing a steel member 3 according to a design drawing, performing anti-corrosion treatment on the steel member, fixing the steel member in a prefabricated pier 1 when the pier is prefabricated, and exposing a bolt box 6 and an end plate 8 on the butt joint side of the prefabricated pier 1;
3) according to design requirements, with reference to fig. 3, inserting reinforcing steel bars (not shown in the figure) into the openings 91 of the connecting plates 9, after the pier reinforcing steel bars are manufactured, installing pier templates, pouring pier concrete, maintaining the piers, and after the strength of concrete slabs is achieved, removing the pier templates;
4) the prefabricated bridge pier 1 is transported to a construction site, and an epoxy resin layer 5 is laid on a positioning plate 7 of the bearing platform 2;
5) hoisting the prefabricated pier 1, inserting the prefabricated pier 1 into the reserved hole 71 through the embedded fastener 4 after the prefabricated pier 1 is installed in place, penetrating through the end plate 8, and connecting the prefabricated pier 1 and the bearing platform 2 by using the embedded fastener 4;
6) and after the fastening pieces 4 are firmly connected, coating grease on the exposed fastening pieces 4 and closing the bolt box 6.
In this embodiment, the strength level, size and location of the fastener 4 are determined by existing specifications.
In this embodiment, the arrangement number structure of the fastening members 4 is determined by calculation according to the existing specifications.
In this embodiment, the thickness and the type of the positioning plate 7 are determined according to design requirements.
In this embodiment, the number of openings of the connecting plate 9 is determined according to design requirements.
The connecting system obtained by adopting the process comprises an arrangement form of a prefabricated pier 1, a bearing platform 2, a steel member 3, a fastener 4, an epoxy resin layer 5, a bolt box 6, a positioning plate 7, an end plate 8 and a connecting plate 9, which is shown in figure 1. Prefabricated pier 1 is the cuboid, the cross section is the rectangle, the size is 1.2 mx 5m, cushion cap 2 is the cuboid, the cross section is the rectangle, the size is 3 mx 2m, 5 thickness on epoxy layer is 2mm, the thickness of connecting plate 9 is 20mm, locating plate 7 and end plate 8 thickness are 25mm, combine figure 4, locating plate 7 and end plate 8 all can adopt the steel sheet, hole 71 is evenly reserved all around to locating plate 7, fastener 4 adopts high strength bolt.
The prefabricated bridge pier 1 and the bearing platform 2 are arranged as shown in fig. 1, and the specific coordinate positions of the holes are reserved in the end plates 8: around end plate 8, the size is the round hole 2mm greater than fastener 4's screw rod diameter, and the clear distance in hole is 20mm to evenly arrange around along end plate 8, the hole number is calculated according to actual pier atress condition, through the design and is reachd.
Installing a steel member 3 at the connecting end of the prefabricated pier 1 when the pier 1 is prefabricated; when the bearing platform 2 is poured, the screw rods of the fasteners 4 are pre-embedded in the bearing platform 2, in order to ensure accurate position, the pre-embedded screw rods are fixed by the positioning plates 7, threaded connecting ends of the pre-embedded screw rods are protected, and installation of nuts is facilitated; the steel member 3 consists of the bolt boxes 6, the end plates 8 and the connecting plates 7, when the prefabricated pier 1 is manufactured, reinforcing steel bars are inserted into the open holes 91 of the connecting plates 9 so as to improve the connecting strength of the steel member 3 and the prefabricated pier 1, and the bolt boxes 6 need to be sealed and cannot be filled with concrete, so that the installation of the fasteners 4 is facilitated; before the prefabricated pier 1 is installed, an epoxy resin layer 5 is laid on a positioning plate 7 of the bearing platform 2, and then the periphery of the bearing platform 2 is connected with the periphery of the prefabricated pier 1 through fasteners 4 to form a whole.
The above is the preferred embodiment of the present application, and several other simple substitutions and modifications made on the premise of the inventive concept should be considered as belonging to the protection scope of the present invention.
Claims (9)
1. The utility model provides an assembled girder bridge prefabricated pier and cushion cap connected system which characterized in that: including prefabricated pier, cushion cap, steel member, locating plate, fastener and epoxy, epoxy is located between steel member and the locating plate, and the fastener runs through steel member and locating plate, and fastener one end is fixed with the cushion cap, and the other end is fixed with prefabricated pier.
2. The prefabricated bridge pier and cushion cap connecting system of the fabricated girder bridge according to claim 1, wherein: the steel member consists of a bolt box, an end plate and a connecting plate, the end plate is positioned at one end of the prefabricated bridge pier facing the bearing platform, the connecting plate and the bolt box are fixed at one side of the end plate facing the prefabricated bridge pier, the bolt box is sealed, a fastener is connected with the prefabricated bridge pier through the bolt box, and the connecting plate is perpendicular to the end plate; and an epoxy resin layer is laid on the other side of the end plate.
3. The prefabricated bridge pier and bearing platform connecting system for the fabricated girder bridge according to claim 2, wherein: the connecting plate is provided with a hole, and a reinforcing rib is arranged in the hole.
4. The prefabricated bridge pier and abutment connecting system of an assembled girder bridge according to claim 2 or 3, wherein: the connecting plate is provided with a plurality of, and the trompil is provided with a plurality of.
5. The prefabricated bridge pier and cushion cap connecting system of the fabricated girder bridge according to claim 1, wherein: the fastener is the bolt, and the screw rod of bolt is fixed in the cushion cap, and wired one end is located prefabricated pier as the link.
6. The prefabricated bridge pier and bearing platform connecting system for the fabricated girder bridge according to claim 2, wherein: the fastener is the bolt, and the screw rod of bolt is fixed in the cushion cap, and bolt has a silk one end to be located the bolt box to the installation of nut.
7. The prefabricated bridge pier and cushion cap connecting system of the fabricated girder bridge according to claim 1, wherein: the positioning plate is provided with an opening, the opening is arranged along the periphery of the positioning plate, the periphery of the fastening piece is connected, and the bearing platform and the prefabricated pier are integrated; reinforcing steel bars are arranged in the open holes to serve as reinforcing ribs, and the number of the open holes and the number of the reinforcing ribs are multiple; holes are reserved around the end plates, and the holes are multiple.
8. A construction method of a connecting system of a prefabricated bridge pier and a bearing platform of an assembled beam bridge is characterized by comprising the following steps:
1) binding a bearing platform steel bar on a construction site, installing a positioning plate, embedding a fastener, pouring bearing platform concrete, and maintaining to the designed strength;
2) processing a steel member according to a design drawing, performing anti-corrosion treatment on the steel member, fixing the steel member in the prefabricated bridge pier when the bridge pier is prefabricated, and exposing the bolt box and the end plate on the butt joint side of the prefabricated bridge pier;
3) according to design requirements, inserting reinforcing steel bars into the openings of the connecting plates to serve as reinforcing ribs, installing pier templates after pier reinforcing steel bars are manufactured, pouring pier concrete, maintaining piers, and removing the pier template system after the strength of concrete slabs is achieved;
4) the prefabricated bridge pier is transported to a construction site, and an epoxy resin layer is laid on a positioning plate of the bearing platform;
5) hoisting the prefabricated bridge pier, inserting the prefabricated bridge pier into the reserved hole through the embedded fastener after the prefabricated bridge pier is installed in place, penetrating through the end plate, and connecting the prefabricated bridge pier with the bearing platform through the embedded fastener;
6) and after the fasteners are firmly connected, coating butter on the exposed fasteners, and sealing the bolt box.
9. The construction method of the prefabricated bridge pier and cushion cap connecting system of the fabricated girder bridge according to claim 8, wherein: the prefabricated bridge pier is a cuboid, the cross section of the prefabricated bridge pier is rectangular, and the size of the prefabricated bridge pier is 1.2m multiplied by 5 m; the bearing platform is a cuboid, the cross section of the bearing platform is rectangular, and the size of the bearing platform is 3m multiplied by 2 m; the fastener adopts a high-strength bolt; the thickness of the epoxy resin layer is 2mm, the thickness of the connecting plate is 20mm, the thicknesses of the positioning plate and the end plate are both 25mm, holes are formed in the positioning plate and the end plate, the size of each hole is a round hole which is 2mm larger than the diameter of a screw of the fastener, the clear distance between the holes is 20mm, and the holes are evenly distributed around the positioning plate and the end plate respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010867712.9A CN112030729A (en) | 2020-08-26 | 2020-08-26 | Prefabricated bridge pier and bearing platform connecting system for assembled beam bridge and construction method of prefabricated bridge pier and bearing platform connecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010867712.9A CN112030729A (en) | 2020-08-26 | 2020-08-26 | Prefabricated bridge pier and bearing platform connecting system for assembled beam bridge and construction method of prefabricated bridge pier and bearing platform connecting system |
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| CN112030729A true CN112030729A (en) | 2020-12-04 |
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| CN202010867712.9A Pending CN112030729A (en) | 2020-08-26 | 2020-08-26 | Prefabricated bridge pier and bearing platform connecting system for assembled beam bridge and construction method of prefabricated bridge pier and bearing platform connecting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481827A (en) * | 2021-07-23 | 2021-10-08 | 中铁上海工程局集团有限公司 | Assembled bridge connection structure |
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| US8006339B1 (en) * | 2009-03-27 | 2011-08-30 | Jeffery W Bennett | Prefabricated articulating pier cap |
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| CN113481827A (en) * | 2021-07-23 | 2021-10-08 | 中铁上海工程局集团有限公司 | Assembled bridge connection structure |
| CN113481827B (en) * | 2021-07-23 | 2022-09-27 | 中铁上海工程局集团有限公司 | Assembled bridge connection structure |
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Application publication date: 20201204 |
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