CN106638274A - Unidirectional prestressed ultrahigh-performance concrete thin-walled box girder standard segment - Google Patents
Unidirectional prestressed ultrahigh-performance concrete thin-walled box girder standard segment Download PDFInfo
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- CN106638274A CN106638274A CN201611159937.9A CN201611159937A CN106638274A CN 106638274 A CN106638274 A CN 106638274A CN 201611159937 A CN201611159937 A CN 201611159937A CN 106638274 A CN106638274 A CN 106638274A
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- standard sections
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- high performance
- performance concrete
- box girder
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a unidirectional prestressed ultrahigh-performance concrete thin-walled box girder standard segment, comprising a deck plate, web plates, a bottom plate, transverse partitions, and external prestressed tendons; the deck plate is opposite to the bottom plate, the through standard segment is formed by connecting the web plates to two sides respectively, and the transverse partitions are connected to the inner wall of the standard segment and are perpendicular to the deck plate. The unidirectional prestressed ultrahigh-performance concrete thin-walled box girder standard segment also comprises longitudinal ribs, transverse ribs I, transverse ribs II and diverting blocks, the longitudinal ribs are disposed on the lower wall of the deck plate and are perpendicular to the transverse partitions, the transverse ribs I and the transverse ribs II, the transverse ribs I and the transverse ribs II are connected to the lower wall of the deck plate, the transverse ribs I are disposed at open ends of two sides of the standard segment, and the transverse ribs II are disposed between the transverse partitions. Quick construction of the segment can be achieved, the structure of the standard segment can be optimized, total weight can be reduced, integral rigidity and strength, especially, longitudinal rigidity, are enhanced, and it is convenient to further improve the crossing ability of a girder bridge.
Description
Technical field
The present invention relates to bridge structure building field, more particularly to a kind of unidirectional prestressing force ultra-high performance concrete thin-walled box
The standard sections of beam.
Background technology
The disease such as large-span prestressed concrete beam formula bridge generally existing beam body cracking, the excessive downwarp of main span, and beam at present
The excessive economic span of body deadweight is difficult to break through 300m.Basic reason is that normal concrete tensile strength is low, Creep Coefficient is larger,
And ultra-high performance concrete has the advantages that high elastic modulus, high resistance to compression, tensile strength and good Creep Characteristics, can reduce
Physical dimension, mitigates dead load, improves the ability that structure opposing load validity and increase are crossed over.Therefore, based on superelevation
Can the unidirectional prestressing force ultra-high performance concrete continuous box-beam structure of concrete performance research and development be expected to solve an above-mentioned difficult problem, and by beam
The span ability of formula bridge is promoted to 500m levels.
Unidirectional prestressing force ultra-high performance concrete thin-walled box girder bridge adopts beam body prefabrication, live precast segment assembly
Construction method.Will beam body longitudinally divided for several sections, after beam factory is prefabricated, transports to scene and assembled, and lead to
Cross applying prestressing force and make overall.For the assembled box beam of sections, all box girder segments are prefabricated in beam factory, box girder segment
Rapid construction of the standardization to precast assembly seem particularly significant.
Therefore, it is real in order that unidirectional prestressing force ultra-high performance concrete Thin-walled box beam structure can be practical in practice
A kind of assembled rapid, the unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections of exploitation of existing precast segment.
The content of the invention
The technical problem to be solved is to provide a kind of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder mark
Quasi- sections, to realize the rapid construction of the section assembling of the unidirectional prestressing force ultra-high performance concrete box girder bridge of Ultra-Long Spans.
To solve above-mentioned technical problem, technical scheme proposed by the present invention is a kind of unidirectional prestressing force ultra-high performance concrete
Thin-walled Box Girder standard sections, including floorings, web, base plate, diaphragm plate, prestressing with bond beam, external pre-stress bundle, longitudinal rib, I
Class cross rib and II class cross ribs, the floorings and base plate are oppositely arranged, and connect the web respectively by both sides and form insertion
Standard sections, the diaphragm plate is connected and perpendicular to the floorings with the standard sections inwall, and the longitudinal rib is arranged at institute
State in the lower wall of floorings and vertical with the diaphragm plate, I classes cross rib and II class cross ribs, the I classes cross rib and II class cross ribs
It is connected with the lower wall of the floorings, the I classes cross rib is arranged on the open end of the standard sections both sides, the II
Class cross rib is arranged between the diaphragm plate, and I classes cross rib bonding after two adjacent standard knot section assembly forms described together
II class cross ribs.This kind of novel standard sections, not only realizes on the whole lightweight, material has been saved, while improve entirety
Strength and stiffness, facilitate implementation the lifting of bridge construction efficiency and the realization of large span.
Further, in the standard sections floorings, formation between longitudinal rib, diaphragm plate, I classes cross rib and II class cross ribs
The short floor deck system of orthotropic, its is longitudinally rigid much larger than horizontal rigidity, relative to orthogonal same sex bridge floor beaer
System, further mitigate its dead load, be beneficial to by the span ability of beam bridge be promoted to 500m levels and more than.
Further, also tooth block and externally cable anchoring tooth block are anchored including internal beam, the internal beam anchors tooth block build-in
On the I classes cross rib and diaphragm plate is passed through, it is and affixed with the lower wall of the floorings；The externally cable anchors tooth block build-in
Between the diaphragm plate and affixed with the web madial wall, the external pre-stress bundle anchors tooth block anchor by externally cable
Gu, the prestressing with bond beam anchors the anchoring of tooth block by the internal beam, relative to tradition anchoring tooth directly on inwall
Block is arranged, and the set-up mode of the present invention increased the support strength of anchoring tooth block.
Further, the bridge floor plate thickness is 0.07m～0.20m, and the longitudinal rib is highly 0.10m～0.30m, described
Floorings combine to form short rib structure with longitudinal rib, and the longitudinal rib section is inverted trapezoidal, and its upper limb width is 0.16m～0.30m,
Lower edge width is 0.14m～0.28m, and the adjacent longitudinal rib center distance is 0.50～1.20m, and this kind is arranged on guarantee materials most
On the premise of few, overall rigidity and intensity is improve.
Further, the diaphragm plate in the standard sections is twice, the diaphragm plate include one upper string board, two to four
Road side plate lower boom plate with together with.The tabula plate thickness is 0.10m～0.20m, and the upper string board is highly two web center lines
The 1/7～1/10 of spacing, the lower edge plate hight degree is 0.50m～1.50m, and the side plate width is 0.50m～2.00m, if abdomen
When plate spacing is less, using twice side plate, if web spacing is larger, using three to four road side plates.This kind of insertion of diaphragm plate
Setting, further increase the strength and stiffness of standard sections.
Further, the standard sections includes twice I class cross rib II classes cross rib with together with, and the I classes cross rib thickness is
0.08m～0.15m, the II classes cross rib thickness is 0.12m～0.30m, and the I classes cross rib and II classes cross rib are highly two webs
The 1/7～1/30 of centreline spacing, this kind is set to the further optimization of standard sections of the present invention, and the I classes cross rib is in vivo
Beam anchoring tooth block arranges a notch, the tensioning and the sealing off and covering anchorage that are provided with beneficial to prestressing with bond beam of notch at position.
Further, web and base plate are stated using thin-walled plate, web thickness is 0.12m～0.50m, and base plate thickness is
0.12m～2.00m, on the premise of thin-walled plate is arranged on guarantee bulk strength and rigidity, realizes the lightweight of standard sections.
Further, also including steering block, its build-in is on the side plate of diaphragm plate, and one of face and web madial wall
Affixed, external pre-stress bundle passes through the steering block, the steering block that this kind is arranged, under the active force of prestressing tendon, not only
Power to web is supported, while the effective support of diaphragm plate can also be obtained further, it is to avoid the problem of the easy cracking of steering block.
Further, also including being separately positioned on shear connector on two open ends of the standard sections, the shear connector
It is the joinery and its construction for including tenon and tongue-and-groove, the open end of standard sections one is provided with multiple tenons, another open end
Multiple tongue-and-grooves are provided with, are close in web inner side, the bond distance of shear connector is 0.50m～2.00m, a width of 0.10m of key～
0.30m, key depth is 0.2m～1.00m.Joinery and its construction increases the shearing strength of shear connector, is further advantageously implemented beam bridge
Span ability lifted.
Further, the standard sections is the standard sections of uiform section deck-molding or variable cross-section deck-molding, is mixed by very-high performance
Solidifying soil is poured and formed, and the ultra-high performance concrete is RPC of the compression strength not less than 100MPa or superelevation
Energy fibre reinforced concrete or closely knit with rib reinforced composite material, this kind of ultra-high performance concrete is more easily implemented the light weight of standard sections
Change, high intensity, high rigidity.
Compared with prior art, it is an advantage of the current invention that：A kind of unidirectional prestressing force ultra-high performance concrete of the present invention
Thin-walled Box Girder standard sections, the beam section that can make aforementioned unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder is divided, beam section is pre-
System standardization, improves beam section production efficiency, template and operating expenses is reduced, to realize aforementioned unidirectional prestressing force very-high performance coagulation
The rapid construction of native Thin-walled Box Girder, meanwhile, standard sections realizes the optimization of structure, reduces overall weight, enhances entirety
Rigidity and intensity especially enhance longitudinally rigid, facilitate implementation the further lifting of the span ability of beam bridge.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is that the vertical view of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections in the embodiment of the present invention is three-dimensional
Schematic diagram；
Fig. 2 is that unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections looks up three-dimensional in the embodiment of the present invention
Schematic diagram；
Fig. 3 is that the longitudinal direction of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections in the embodiment of the present invention is half-sectional
Schematic three dimensional views；
Fig. 4 is the short floor of beam of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections in the embodiment of the present invention
Organigram；
Fig. 5 is the Tenon construction of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections in the embodiment of the present invention
Schematic diagram；
Fig. 6 is the A-A cross-sectional schematics of Fig. 5；
Fig. 7 is the B-B cross-sectional schematics of Fig. 5.
Marginal data：
1st, floorings；2nd, longitudinal rib；3rd, web；4th, base plate；5th, diaphragm plate；6th, upper string board；7th, side plate；8th, lower boom plate；9th, I classes
Cross rib；10th, II classes cross rib；11st, prestressing with bond beam；12nd, external pre-stress bundle；13rd, steering block；14th, internal beam anchors tooth block；
15th, externally cable anchoring tooth block；16th, shear connector；161st, tenon；162nd, tongue-and-groove；17th, notch.
Specific embodiment
For the ease of understanding the present invention, more complete is made to the present invention below in conjunction with Figure of description and preferred embodiment
Face, meticulously describe, but protection scope of the present invention is not limited to embodiment in detail below.
It should be strongly noted that when a certain element, to be described as " be fixed on, be fixed in, be connected to or be communicated in " another
When on element, it can be directly fixed, affixed, connection or connect on another element, or by connecting in the middle of other
Fitting is indirectly fixed, affixed, connection or connection are on another element.
Unless otherwise defined, the implication that all technical terms used hereinafter are generally understood that with those skilled in the art
It is identical.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to limit the present invention
Protection domain.
Unless otherwise specified, various raw material, reagent, instrument and equipment used in the present invention etc. can pass through city
Field is commercially available or can be prepared by existing method.
Embodiment：
The invention discloses a kind of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections, the standard sections is adopted
With prefabrication, the construction method of on-site consolidation, integrally poured by ultra-high performance concrete and formed, its entire length is about 8m,
Box beam top board width is about 12m, is highly 10m～12m, and in the present embodiment, the ultra-high performance concrete is that compression strength is not little
RPC, very-high performance fibre reinforced concrete or closely knit with rib reinforced composite material in 100MPa, the standard sections
Structure as shown in Fig. 1-Fig. 7, whole standard sections for insertion body structure, including floorings 1, web 3, base plate 4 and horizontal stroke
Dividing plate 5, wherein, floorings 1 and base plate 4 are oppositely arranged, and base plate 4 is the twisted plate with certain radian, is connected respectively by both sides
The web 3 for connecing forms the standard sections of insertion, and diaphragm plate 5 is connected and perpendicular to the floorings 1 and abdomen with standard sections inwall
Plate 3, in the present embodiment, as one kind preferably, the thickness of floorings 1 is 0.08m, and the thickness of web 3 is 0.35m, and the thickness of base plate 4 is
0.90m.Wherein, longitudinal rib 2 is vertically arranged with along the standard sections in the lower wall of floorings 1, the longitudinal rib 2 is simultaneously embedding with diaphragm plate 5
Gu, in the present embodiment, preferably the section of longitudinal rib 2 is inverted trapezoidal structure as a kind of, and its upper limb width is 0.20m, lower edge width
Spend for 0.18m, the adjacent center distance of longitudinal rib 2 is 0.70m, longitudinal rib 2 and floorings 1 constitute short rib structure, short floor knot
The height of structure is 0.25m.Meanwhile, in the present embodiment, diaphragm plate 5 is twice, thin in the standard sections to be uniformly arranged on
Wallboard part, the spacing between twice diaphragm plate 5 is 4m, wherein, under dividing plate 5 includes one upper string board 6, twice side plate 7 with together with
Boom plate 8, the thickness of diaphragm plate 5 is 0.12m, and the height of upper string board 6 is 1.50m, and the lower height of boom plate 8 is 1.00m, and the height of side plate 7 is 1m,
By the setting of the diaphragm plate 5, the effect of reinforcing is served to whole standard sections.
In the lower wall of floorings 1 of the standard sections, I classes cross rib 9 and II classes cross rib 10 are additionally provided with, wherein, I class cross ribs
9 are arranged on the open end of the standard sections both sides, and II classes cross rib 10 is arranged in the middle of twice diaphragm plate 5, in this enforcement
In example, the thickness of I classes cross rib 9 is 0.10m, and the thickness of II classes cross rib 10 is 0.20m, and the height of II classes cross rib 10 is 1.50m.So as to this
Longitudinal rib 2, diaphragm plate 5 in standard sections, the short floor bridge floors of orthotropic UHPC are formed between I classes cross rib 9 and II classes cross rib 10
System, can realize the standard sections it is light-weighted simultaneously, improve its rigidity and be easy to arrange prestressing with bond beam 11.
Further, also including internal beam anchoring tooth block 14 and externally cable anchoring tooth block 15, internal beam anchoring tooth block 14 is embedding
It is fixed between I classes cross rib 9 and consolidates through one diaphragm plate 5 and with the lower wall of floorings 1；The build-in of externally cable anchoring tooth block 15
Consolidate between diaphragm plate 5 and with the inwall of web 3, external pre-stress bundle 12 anchors tooth block 15 and anchors by externally cable, pre- in vivo
Stress beam 11 anchors tooth block 14 and anchors by internal beam, wherein, in the present embodiment, the external pre-stress bundle 12 in the sections is
8 beams, prestressing with bond beam 11 is 6 beams.Further, stress beam steering block 13, the steering are additionally provided with the standard sections
The build-in of block 13 is consolidated in diaphragm plate side plate 7, and one of face with the wallboard of the standard sections, and external pre-stress bundle 12 is by embedding
The steering block 13 being fixed on diaphragm plate 5, this kind is arranged can be resisted because external pre-stress bundle 12 turns to the radial load for producing, together
When, I classes cross rib 9 arranges in vivo a notch 17 at the position of beam anchoring tooth block 14, and notch 17 is provided with beneficial to prestressing with bond
The tensioning of beam 11 and sealing off and covering anchorage.
In the present embodiment, also including being separately positioned on shear connector 16 on two open ends of standard sections, the shearing
Key 16 is the joinery and its construction for including tenon 161 and tongue-and-groove 162, and in the open end of standard sections one multiple tenons 161 are uniformly arranged,
Another open end is uniformly arranged multiple tongue-and-grooves 162, is close to the inner side of web 3, and its size can be protected with mutually nested laminating with this
Being accurately positioned, contacting stable tight and shear resistant capacity when card sections splices.The bond distance of shear connector 16 is 0.50m～2.00m,
A width of 0.10m～the 0.30m of key, key depth is 0.2m～1.00m.
In the present embodiment, its set-up mode is corresponding for both sides with tongue-and-groove 162 for tenon 161, i.e., side is set to tenon
161, and opposite side is set to tongue-and-groove 162.Using the present embodiment standard section assembling when, adhesive, shape are smeared between sections
It is glued into sections and stitches；During using cast-in-place ultra-high performance concrete, the wet seam of sections, when being glued seam using sections, the mark are formed
The I classes cross rib 9 of quasi- sections both sides is glued into the II classes cross rib 10 of one piece of entirety with the I classes cross rib 9 of adjacent modular sections, improves
Overall uniformity.
In the present embodiment, ultra-high performance concrete is a proprietary name in the art, is generally referred to anti-with superelevation
The good concrete of Compressive Strength, high-tensile, high ductility, high tenacity, high-durability, application property, its be relatively common concrete,
The more excellent concrete material of another kind of mechanical property for high performance concrete, the ultra-high performance concrete is thin
Wall box-beam structure is to be poured to form by ultra-high performance concrete, the ultra-high performance concrete can for RPC,
It is very-high performance fibre reinforced concrete, slip casting fiber concrete, closely knit with rib reinforced composite material or engineering latex composite material etc., but
Preferably RPC, very-high performance fibre reinforced concrete or closely knit arrangement of reinforcement cement-base composite material.
Claims (10)
1. a kind of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections, it is characterised in that including floorings (1),
Web (3), base plate (4), diaphragm plate (5), prestressing with bond beam (11), external pre-stress bundle (12), longitudinal rib (2), I class cross ribs
(9) and II class cross ribs (10), the floorings (1) and base plate (4) are oppositely arranged, and by both sides the web (3) is connected respectively
The standard sections of insertion is formed, the diaphragm plate (5) is connected and perpendicular to the floorings (1) with the standard sections inwall,
The longitudinal rib (2) is arranged in the lower wall of the floorings (1) and horizontal with the diaphragm plate (5), I class cross ribs (9) and II classes
Rib (10) is vertical, and the I classes cross rib (9) and II class cross ribs (10) are connected with the lower wall of the floorings (1), and the I classes are horizontal
Rib (9) is arranged on the open end of the standard sections both sides, the II classes cross rib (10) be arranged at the diaphragm plate (5) it
Between, the I classes cross rib (9) bonding after two adjacent standard knot section assembly forms the II classes cross rib (10) together.
2. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 1, it is characterised in that
Floorings (1), formation between longitudinal rib (2), diaphragm plate (5), I class cross ribs (9) and II class cross ribs (10) in the standard sections
The short floor deck system of orthotropic.
3. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 1, it is characterised in that
Also include internal beam anchoring tooth block (14) and externally cable anchoring tooth block (15), the internal beam anchors tooth block (14) build-in in described
It is on I class cross ribs (9) and through the diaphragm plate (5) and affixed with the lower wall of the floorings (1)；The externally cable anchoring
Tooth block (15) build-in is between the diaphragm plate (5) and affixed with the web (3) madial wall, the external pre-stress bundle (12)
Tooth block (15) anchoring is anchored by externally cable, the prestressing with bond beam (11) anchors tooth block (14) anchor by the internal beam
Gu.
4. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 1, it is characterised in that
Floorings (1) thickness be 0.07m～0.20m, the longitudinal rib (2) highly be 0.10m～0.30m, the floorings (1) with
Longitudinal rib (2) combination forms short rib structure, and longitudinal rib (2) section is inverted trapezoidal, and its upper limb width is 0.16m～0.30m, under
Edge width is 0.14m～0.28m, and adjacent longitudinal rib (2) center distance is 0.50～1.20m.
5. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 1, it is characterised in that
Diaphragm plate (5) in the standard sections is twice, and the diaphragm plate (5) includes one upper string board (6), the road side plates of Liang Zhi tetra-
(7) boom plate (8) and is together descended, diaphragm plate (5) thickness is 0.10m～0.20m, and the upper string board (6) is highly two webs
(3) the 1/7～1/10 of centreline spacing, the lower boom plate (8) is highly 0.50m～1.50m, and side plate (7) width is
0.50m～2.00m.
6. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 3, it is characterised in that
The standard sections includes twice I class cross rib (9) and II classes cross rib (10) together, I classes cross rib (9) thickness for 0.08m～
0.15m, II classes cross rib (10) thickness is 0.12m～0.30m, and the I classes cross rib (9) and II class cross ribs (10) are highly two
The 1/7～1/30 of web (3) centreline spacing, in vivo beam anchors one groove of setting at tooth block (14) position to the I classes cross rib (9)
Mouth (17).
7., according to the arbitrary described unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections of claim 1-6, it is special
Levy and be, the web (3) and base plate (4) adopt thin-walled plate, and web (3) thickness is 0.12m～0.50m, and base plate (4) is thick
Spend for 0.12m～2.00m.
8. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 7, it is characterised in that
Also include steering block (13), its build-in is on the diaphragm plate (5), and one of face is affixed with web (3) madial wall, in vitro
Prestressing tendon (12) is through the steering block (13).
9. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 8, it is characterised in that
Also include being separately positioned on shear connector (16) on two open ends of the standard sections, the shear connector (16) is to include tenon
(161) and tongue-and-groove (162) joinery and its construction, the open end of standard sections one is provided with multiple tenons (161), another opening
End face is provided with multiple tongue-and-grooves (162), is close in web (3) inner side, and the bond distance of shear connector (16) is 0.50m～2.00m, key
A width of 0.10m～0.30m, key depth is 0.2m～1.00m.
10. unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard sections according to claim 9, its feature exists
In the standard sections is the standard sections of uiform section deck-molding or variable cross-section deck-molding, is poured by ultra-high performance concrete and is formed, institute
It is RPC of the compression strength not less than 100MPa or very-high performance fiber reinforcement coagulation to state ultra-high performance concrete
It is native or closely knit with rib reinforced composite material.
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| CN112496589A (en) * | 2020-12-31 | 2021-03-16 | 江苏京沪重工有限公司 | Manufacturing process of anchoring section box girder |
| CN114086456A (en) * | 2021-11-03 | 2022-02-25 | 中铁第一勘察设计院集团有限公司 | UHPC thin-wall box girder structure of section steel stiffening framework and construction method |
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