CN111764249B - A composite beam structure of UHPC honeycomb prefabricated panel-steel box beam and construction method - Google Patents
A composite beam structure of UHPC honeycomb prefabricated panel-steel box beam and construction method Download PDFInfo
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- CN111764249B CN111764249B CN202010633675.5A CN202010633675A CN111764249B CN 111764249 B CN111764249 B CN 111764249B CN 202010633675 A CN202010633675 A CN 202010633675A CN 111764249 B CN111764249 B CN 111764249B
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000010276 construction Methods 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 239000011162 core material Substances 0.000 claims abstract description 41
- 239000004567 concrete Substances 0.000 claims description 31
- 238000005192 partition Methods 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 8
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000001788 irregular Effects 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
- 238000003672 processing method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
本申请涉及一种UHPC蜂窝预制板‑钢箱梁的组合梁结构及施工方法，涉及桥梁结构技术领域，该组合梁结构包括UHPC蜂窝预制板和钢箱梁，UHPC蜂窝预制板设为蜂窝夹层结构，其从上至下依次包括上蒙皮板、蜂窝芯材、下蒙皮板以及分别与蜂窝芯材左右两侧面紧密连接的两侧蒙皮板，下蒙皮板的下表面与钢箱梁固定连接。本申请充分利用UHPC材料的高强特性、蜂窝夹层结构的轻质、抗压、抗弯性能以及钢箱梁构件的抗剪能力，不仅可解决桥面板易开裂问题，且可降低桥梁结构自重；另外，UHPC蜂窝预制板和钢箱梁通过工厂预制成整体，再运输至现场进行节段拼装，其可提高效率并缩短施工工期。因此，本申请不仅可减轻桥梁结构自重和降低成本，还可提高施工效率并缩短施工工期。
The present application relates to a composite beam structure and construction method of a UHPC honeycomb prefabricated plate-steel box beam, and relates to the technical field of bridge structures. The composite beam structure includes a UHPC honeycomb prefabricated plate and a steel box beam. The UHPC honeycomb prefabricated plate is set as a honeycomb sandwich structure, which includes an upper skin plate, a honeycomb core material, a lower skin plate, and two side skin plates tightly connected to the left and right sides of the honeycomb core material from top to bottom, and the lower surface of the lower skin plate is fixedly connected to the steel box beam. The present application makes full use of the high-strength characteristics of UHPC materials, the light weight, compression resistance, and bending resistance of the honeycomb sandwich structure, and the shear resistance of the steel box beam components, which can not only solve the problem of easy cracking of the bridge deck, but also reduce the deadweight of the bridge structure; in addition, the UHPC honeycomb prefabricated plate and the steel box beam are prefabricated as a whole in the factory, and then transported to the site for segment assembly, which can improve efficiency and shorten the construction period. Therefore, the present application can not only reduce the deadweight of the bridge structure and reduce costs, but also improve construction efficiency and shorten the construction period.
Description
Technical Field
The application relates to the technical field of bridge structures, in particular to a combined beam structure of a UHPC honeycomb precast slab-steel box beam and a construction method.
Background
The conventional composite beam structure is generally composed of a solid common concrete bridge deck plate and a steel box beam member, and the concrete bridge deck plate is easy to crack under the action of external load and constraint load due to low tensile strength of concrete materials and obvious shrinkage creep effect.
In the related art, measures such as increasing the thickness of the bridge deck plate and configuring prestressed tendons are generally adopted to solve the cracking problem of the concrete bridge deck plate, but the processing method for increasing the thickness of the bridge deck plate not only can lead to larger dead weight of the main beam, but also can further increase the dead weight of the cross section of the bridge due to the fact that the bridge deck plate is generally a solid plate, the design of the structural dimension is correspondingly increased, the problems of large consumption of materials and high cost exist, and the cracking problem of the concrete bridge deck plate cannot be fundamentally solved.
Disclosure of Invention
The embodiment of the application provides a combined beam structure of a UHPC honeycomb precast slab-steel box beam and a construction method, which are used for solving the problems that the bridge deck is easy to crack, the dead weight of the bridge is large, the consumption of consumables is large and the construction cost is high due to the adoption of the increased thickness of the bridge deck in the related art.
According to the first aspect, the combined beam structure of the UHPC honeycomb precast slab-steel box beam comprises a steel box beam and further comprises a UHPC honeycomb precast slab, wherein the UHPC honeycomb precast slab is positioned above the steel box beam, the UHPC honeycomb precast slab is arranged into a honeycomb sandwich structure, the honeycomb sandwich structure sequentially comprises an upper skin slab, a honeycomb core material, a lower skin slab and two side skin slabs which are respectively and tightly connected with the left side surface and the right side surface of the honeycomb core material from top to bottom, the lower surface of the lower skin slab is fixedly connected with the steel box beam, and the upper skin slab, the honeycomb core material, the lower skin slab and the side skin slabs are made of UHPC concrete.
In some embodiments, the bottom surface of the honeycomb core is provided with a toothed-rack structure.
The concave surface of the tooth-shaped joint structure is provided with a first shear connector, and the first shear connector and the convex surface of the tooth-shaped joint structure are embedded into the lower skin plate.
And the upper skin plate on each nest hole of the honeycomb core material is provided with a health-preserving hole.
And each nest hole on the front and rear outermost sides of the honeycomb core material is internally provided with a baffle plate.
And a longitudinal wet joint is arranged between the UHPC honeycomb precast slab and the steel box girder.
The combined beam structures are multiple, and transverse wet joints are arranged between every two adjacent combined beam structures.
The steel box girder is characterized in that a second shear connector is arranged on an upper flange steel plate of the steel box girder, and the steel box girder is connected with the lower surface of the lower skin plate through the second shear connector.
In a second aspect, a construction method of a combined beam structure of a UHPC honeycomb precast slab-steel box beam is provided, comprising the following steps:
Prefabricating a steel box girder and conveying the steel box girder to a UHPC concrete girder field;
Prefabricating a honeycomb sandwich component comprising an upper skin plate, a honeycomb core material and a side skin plate;
setting a template on the steel box girder, pouring a lower skin plate on the template, and fixedly connecting the honeycomb interlayer component with the lower skin plate to form a UHPC honeycomb precast slab;
and setting a longitudinal wet joint between the UHPC honeycomb precast slab and the steel box girder, pouring UHPC concrete at the longitudinal wet joint, and removing the template after the UHPC concrete is solidified.
In some embodiments, the construction method further comprises the steps of arranging a plurality of combined beam structures, arranging transverse wet joints between adjacent combined beam structures, and pouring UHPC concrete at the transverse wet joints.
The technical scheme provided by the application has the beneficial effects that the self weight of the bridge structure can be reduced, the cost is reduced, the compression resistance and the bending resistance of the structure can be ensured, and meanwhile, the prefabricated combined beam structure is adopted for integral hoisting construction, so that the construction efficiency can be improved, and the construction period can be shortened.
The embodiment of the application provides a combined beam structure of a UHPC honeycomb precast slab-steel box girder and a construction method, wherein the combined beam structure comprises the UHPC honeycomb precast slab and the steel box girder, the UHPC honeycomb precast slab is designed into a honeycomb sandwich structure, the combined beam structure sequentially comprises an upper skin slab, a honeycomb core material, a lower skin slab and two side skin slabs which are respectively and tightly connected with the left side surface and the right side surface of the honeycomb core material from top to bottom, the lower surface of the lower skin slab is fixedly connected with the steel box girder, the upper skin slab, the honeycomb core material, the lower skin slab and the side skin slabs are made of UHPC concrete, the combined beam structure has ultrahigh durability and ultrahigh mechanical property, and the honeycomb sandwich structure has better compression resistance and bending resistance and light weight, can fully utilize the strength of materials, combines the high-strength characteristics of the UHPC material, the light weight, the compression resistance and the bending resistance of the honeycomb sandwich structure and the shear resistance of the steel box girder, can solve the problem of bridge deck plate, reduce the consumption of the structure, and the cost, and the bridge construction cost, and the UHPC honeycomb precast slab and the section girder are integrally transported to the site, and the bridge construction cost is shortened, and the self-weight and the construction cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a composite beam structure of a UHPC honeycomb precast slab-steel box beam according to an embodiment of the present application;
FIG. 2 is a front view of FIG. 1 provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a partial structure of FIG. 2 according to an embodiment of the present application;
Fig. 4 is a schematic structural diagram of a UHPC honeycomb prefabricated panel according to an embodiment of the present application;
Fig. 5 is a schematic diagram of an inverted structure of a UHPC honeycomb prefabricated panel according to an embodiment of the application;
FIG. 6 is a schematic diagram of a partial structure of FIG. 5 according to an embodiment of the present application;
Fig. 7 is a schematic structural diagram of segment assembly according to an embodiment of the present application;
FIG. 8 is a cross-sectional view of FIG. 7 provided by an embodiment of the present application;
fig. 9 is a schematic flow chart of a construction method of a combined beam structure of a UHPC honeycomb precast slab-steel box beam according to an embodiment of the present application.
In the figure, 1-UHPC honeycomb precast slab, 11-upper skin slab, 111-curing holes, 12-honeycomb core material, 121-toothed joint structure, 13-lower skin slab, 14-side skin slab, 2-steel box girder, 21-upper flange steel plate, 3-first shear connector, 4-separator, 5-longitudinal wet joint, 6-transverse wet joint and 7-second shear connector.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a combined beam structure of a UHPC honeycomb precast slab-steel box beam and a construction method, which can solve the problems of large dead weight of a bridge, large consumption of materials and high construction cost caused by the fact that the bridge deck is easy to crack due to the adoption of the increased thickness of the bridge deck in the related art.
Referring to fig. 1-5, the embodiment of the application provides a combined beam structure of a UHPC honeycomb precast slab-steel box girder, which comprises a UHPC honeycomb precast slab 1 and a steel box girder 2, wherein the UHPC honeycomb precast slab 1 is positioned above the steel box girder 2, the UHPC honeycomb precast slab 1 is provided with a honeycomb sandwich structure, the honeycomb sandwich structure sequentially comprises an upper skin slab 11, a honeycomb core material 12 and a lower skin slab 13 from top to bottom, the honeycomb sandwich structure further comprises two side skin slabs 14 which are respectively and tightly connected with left and right side surfaces of the honeycomb core material 12, the upper skin slab 11, the honeycomb core material 12 and the side skin slabs 14 are integrally precast and are prefabricated in advance through a die and are formed at one time, and the lower surface of the lower skin slab 13 is fixedly connected with the steel box girder 2, so that an assembled combined beam structure is formed. Preferably, referring to fig. 3, a second shear connector 7 is pre-embedded on the upper flange steel plate 21 of the steel box girder 2, the second shear connector 7 is preferably a shear pin, and the steel box girder 2 is connected with the lower surface of the lower skin plate 13 through the second shear connector 7. In addition, the upper skin plate 11, the honeycomb core 12, the lower skin plate 13 and the side skin plates 14 are all made of UHPC concrete, and UHPC (Ultra-High Performance Concrete) is Ultra-high performance concrete, which has Ultra-high durability and Ultra-high mechanical property, can provide stronger compression resistance and bending resistance, and excellent tensile and perfection performance, and can effectively solve the problem of bridge deck cracking in a hogging moment area.
Specifically, when the bridge deck width is 13m, the segment beam height is 4m, and the steel box beam 2 height is 3.85m, the height of the UHPC honeycomb pre-cast panel 1 can be set to 0.15m, wherein the thickness of the upper skin panel 11 is 0.04m, the side length of each nest hole in the honeycomb core 12 is 0.10m, the thickness is 0.01m, the height is 0.1m, and the side skin panels 14 are set to be different in thickness, the thickness of the lower skin panel 13 is 0.03m, and the outermost irregular nest holes are filled. Wherein, the porosity of the honeycomb core material 12 reaches 88.79%, and the whole section can save concrete 59.19%. The honeycomb sandwich structure not only ensures the compression resistance and bending resistance of the bridge deck, but also ensures the high strength and high mechanical property of UHPC high-performance concrete, thereby not only providing stronger compression resistance and bending resistance, but also effectively solving the cracking problem of the bridge deck in the hogging moment area. The combination of the two reduces the dead weight of the bridge deck to a great extent, energy saving and environmental protection, and has good economic benefit.
Preferably, referring to fig. 6, the bottom surface of the honeycomb core 12 is provided with a horseshoe structure 121, a first shear connector 3 is embedded in the concave surface of the horseshoe structure 121, and the first shear connector 3 and the convex surface of the horseshoe structure 121 are embedded in the upper surface of the lower skin plate 13 to be integrated together, the horseshoe structure 121 and the first shear connector 3 can strengthen the connection between the honeycomb core 12 and the lower skin plate 13, improve the strength of the UHPC honeycomb prefabricated plate 1, and further effectively prevent the honeycomb core 12 from falling off from the lower skin plate 13.
Preferably, referring to fig. 4, the upper skin plate 11 on each nest hole of the honeycomb core 12 is provided with a curing hole 111, and the curing treatment of the lower skin plate 13 is performed by watering the lower skin plate 13 through the curing hole 111, so that the strength of the lower skin plate 13 can be ensured.
Preferably, as shown in fig. 6, each nest hole on the front and rear outermost sides of the honeycomb core 12 is provided with a partition board 4, and the partition board 4 is perpendicular to the side skin board, and can be used as a side template of the transverse wet joint 6, so that the dosage of UHPC concrete at the wet joint can be saved.
Preferably, referring to fig. 7 and 8, the number of the combined beam structures is plural, the transverse wet joints 6 are arranged between the adjacent combined beam structures, the longitudinal wet joints 5 are arranged between the uhpc honeycomb prefabricated plate 1 and the steel box beam 2, the connection effect between the transverse wet joints 6 and the longitudinal wet joints 5 can be enhanced, the tiny defect of the joint surfaces of the sections is made up, the tightness is good, the intrusion of water vapor can be effectively prevented, and the connection stability of the combined beam structure is improved.
Referring to fig. 9, the application also provides a construction method of the UHPC honeycomb precast slab-steel box girder combined girder structure, which comprises the following steps:
s1, prefabricating the steel box girder 2, and conveying the steel box girder 2 to a UHPC concrete girder field.
S2, prefabricating a honeycomb sandwich member including the upper skin panel 11, the honeycomb core 12 and the side skin panels 14.
And S3, arranging a template on the steel box girder 2, pouring a lower skin plate 13 on the template, and fixedly connecting the honeycomb sandwich component with the lower skin plate 13 to form the UHPC honeycomb precast slab 1.
And S4, arranging a longitudinal wet joint 5 between the UHPC honeycomb precast slab 1 and the steel box girder 2, pouring UHPC concrete at the longitudinal wet joint 5, and removing the template after the UHPC concrete is solidified.
Preferably, the construction method further comprises the steps of arranging a plurality of combined beam structures, arranging transverse wet joints 6 between adjacent combined beam structures, and pouring UHPC concrete at the transverse wet joints 6.
Referring to fig. 1-8, prefabricating and assembling a plurality of steel box girders 2 in a factory, pre-burying shear nails on an upper flange steel plate of the steel box girders 2 in advance, and conveying the prefabricated steel box girders 2 to a UHPC concrete girder field; setting a template on the steel box girder 2, and pouring a lower skin plate 13 on the template; prefabricating a honeycomb sandwich component comprising an upper skin plate 11, a honeycomb core 12 and a side skin plate 14 in a UHPC concrete beam field, prefabricating the honeycomb sandwich component by adopting a special die, forming at one time, reserving a curing hole 111 at the upper skin plate 11 at the center of each nest hole by utilizing the die, manufacturing a horse tooth structure 121 at the bottom surface of the honeycomb core 12 by utilizing the die, embedding shear nails at the concave surface of the horse tooth structure 121, accurately placing the prefabricated honeycomb sandwich component on the lower skin plate 13 before the lower skin plate 13 is solidified, ensuring that the prefabricated honeycomb sandwich component is completely immersed in the concrete of the lower skin plate 13 which is newly poured by the convex surface of the horse tooth structure 121 and the shear nails at the concave surface of the horse tooth structure 121, connecting the upper skin plate 11, the honeycomb core 12, the lower skin plate 13 and the side skin plate 14 into a whole, reserving a longitudinal wet joint 5 between the UHPC honeycomb precast plate 1 and a steel box girder 2, pouring the concrete into a combined girder structure as shown in FIG. 6, curing the combined girder structure, erecting a plurality of the upper skin plates 13 and a plurality of the combined girder structures through the transverse curing hole 11, and finally erecting a plurality of the combined bridge girder structures on the floor slab 11 by curing the combined bridge girder structure at the same time, and arranging a partition board 4 in each nest hole on the front and rear outermost sides of the honeycomb core 12, wherein the partition board 4 is perpendicular to the side skin plate and is used as a side template of the transverse wet joint 6, UHPC concrete is poured at the transverse wet joint 6, the half nest holes on the front and rear outermost sides of the honeycomb core 12 are immersed into the newly poured UHPC concrete of the transverse wet joint 6 to be integrated in the pouring process, the curing is carried out, and the steps are repeated until the full bridge frame is completed.
Specifically, in this embodiment, only the portion of the honeycomb core 12 remains at the longitudinal wet joint 5, and the upper skin plate 11 connected with the portion is empty, so that the longitudinal wet joint 5 can be conveniently poured, the longitudinal wet joint 5 and the lower skin plate 13 are poured together, and the entire lattice nest hole is filled until the longitudinal wet joint is flush with the top surface of the upper skin plate 11, and the longitudinal wet joint is about 10 cm-15 cm wide. The lower skin plate 13 is poured in the order of pouring the lower skin plate 13 in a common area, placing a honeycomb sandwich component, pouring a longitudinal wet joint 5 and preserving the strength.
Specifically, in this embodiment, only the front and rear ends of the honeycomb core 12 remain at the transverse wet joint 6, and the upper skin plate 11 connected with the front and rear ends of the honeycomb core 12 are left empty, so that the pouring of the transverse wet joint 6 can be facilitated, the half lattice holes at the front and rear ends of two adjacent honeycomb cores 12 and the concrete at the newly poured transverse wet joint 6 are integrated, the connection effect between the sections can be enhanced, the transverse wet joint 6 is rectangular and long, the width is about 20 cm-25 cm, and the transverse wet joint 6 and the lower skin plate 13 are poured together, and are filled with the half lattice holes until the half lattice holes are flush with the top surface of the upper skin plate 11.
The UHPC honeycomb precast slab with the honeycomb sandwich structure is adopted to replace a solid concrete slab in the prior art, the high-strength characteristic of materials, the light compression resistance and bending resistance of the honeycomb sandwich structure and the shearing resistance of a combined steel structure are fully utilized, the dead weight of the bridge structure can be reduced, the consumption of consumables can be reduced, the cost is reduced, energy is saved, the environment is protected, in addition, the bridge section is prefabricated into a whole through a factory, and then transported to the site for segment assembly, the construction period can be shortened, and the efficiency is improved.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intervening medium, or may be in communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
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| JPH111983A (en) * | 1997-06-10 | 1999-01-06 | Tsutomu Nakamura | Construction method for construction slab and bridge floor plate, and construction plate for concrete placement |
| KR100743936B1 (en) * | 2006-08-11 | 2007-07-30 | 박홍욱 | Honeycomb Reinforcement for Seismic and Reinforcement of Concrete Structures |
| CN204982662U (en) * | 2015-09-14 | 2016-01-20 | 北京大陆益通环保科技有限公司 | Bridge floor complex mat formation piece and mat formation this mat formation piece bridge |
| CN110468708B (en) * | 2019-07-31 | 2024-06-21 | 中铁大桥科学研究院有限公司 | Combined bridge deck structure of steel-UHPC precast slab and construction method thereof |
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