CN106835936A - A kind of FRP constraint concrete-filled steel tubular arch - Google Patents
A kind of FRP constraint concrete-filled steel tubular arch Download PDFInfo
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- CN106835936A CN106835936A CN201710198688.2A CN201710198688A CN106835936A CN 106835936 A CN106835936 A CN 106835936A CN 201710198688 A CN201710198688 A CN 201710198688A CN 106835936 A CN106835936 A CN 106835936A
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- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 229920006387 Vinylite Polymers 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 239000011372 high-strength concrete Substances 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
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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
- E01D4/00—Arch-type bridges
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- 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
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
A kind of FRP constraint concrete-filled steel tubular arch, the present invention relates to a kind of arch structure, think that solve traditional concrete-filled steel tubular arch is exposed to outside concrete using steel pipe, cause steel pipe arch structure to be susceptible to surrender, and make the difficult, problem that steel using amount is big, welding job is heavy, perishable and service life is short.The present invention includes steel flanged beam arch rib and two bases, two bases are symmetricly set on the two ends of steel flanged beam arch rib, the steel flanged beam arch rib includes steel pipe, FRP layers and concrete, the FRP layers of outer layer for being coated on steel pipe, and FRP layers and steel pipe) pass through resin-bonded into multiple tube, casting concrete in multiple tube.The present invention is for concrete structure and the reinforcement and repair of steel construction.
Description
Technical field
The present invention relates to a kind of arch structure, and in particular to a kind of FRP constraint concrete-filled steel tubular arch.
Background technology
Traditional concrete-filled steel tubular arch has the advantages that from heavy and light, compression strength is high, construction is convenient, its core coagulation
Soil under the effect of contraction of peripheral steel pipe be in three dimension stress state, when uniaxial compression compared with, compression strength is increased substantially,
Fragility be improved significantly；The presence of core concrete simultaneously plays certain restriction effect to the bending deformation of steel pipe, can
Delay steel pipe tube wall that local buckling occurs to early.Therefore concrete-filled steel tube arch is in science of bridge building, metro tunnel excavation supporting and big
It is used widely in span spatial structure.
It is exposed to outside concrete yet with peripheral steel pipe, the technology such as anti-corrosion, fire prevention, antirust of conventional steel concrete arch
It is required that higher, especially the susceptibility-to-corrosion of steel pipe causes that this preferable arch component is seldom applied in the environment of high corrosion.
It is general in Practical Project steel pipe is protected using measures such as anticorrosive coatings, but it is incident be great number anti-corrosion and dimension
Shield cost.In addition, if concrete-filled steel tube arch load is larger, member section often using being relatively large in diameter, wall thickness it is thicker
Steel pipe provides enough clamping forces to concrete, but can produce steel pipe manufacturing is difficult, steel using amount is big, welding job is heavy etc. simultaneously
Problem；According to compound or high strength steel pipe, then there are problems that difficulty of construction is big, cost relatively.
In the last few years, fibre reinforced composites (Fiber Reinforced Polymer-FRP) were due to tension
Intensity is high, corrosion resistance and good, from heavy and light, anti-fatigue performance is strong the advantages of more be applied to strengthening reconstruction field.It is emerging
FRP constraint concrete arch structure uses the sidewise restraint stronger for core concrete is provided of FRP sleeve pipes, it is possible to increase the limit of arch
Bearing capacity, while the chemical stability of FRP can avoid the perishable problem of traditional concrete-filled steel tube arch again.But FRP belongs to
In linear elastic materials, structure produces destruction to normally behave as FRP bodys and is bursting at the collision, although the pattern of this brittle break can lead to
Cross the optimization mode such as laying and obtain improvement to a certain degree, but its ductility degree for improving cannot still meet higher and higher antidetonation
Performance requirement；FRP is generally flexible sheet material simultaneously, therefore the rigidity of FRP constraint concrete arch is also low compared with concrete-filled steel tube arch, and single
Body span is often smaller.Therefore the Chinese utility model patent of Application No. 201420830765.3 discloses a kind of segmented
The splicing construction of FRP pipe concrete arch ring monomers, can be effectively increased the length of FRP constraint concrete arch structure and cross over energy
Power, but the construction of this splicing construction is complex, is difficult to promote the use of.
The content of the invention
The present invention is exposed to outside concrete to solve traditional concrete-filled steel tubular arch using steel pipe, causes tubular arch knot
Structure is susceptible to surrender, and makes the difficult, problem that steel using amount is big, welding job is heavy, perishable and service life is short, and carries
Go out a kind of FRP constraint concrete-filled steel tubular arch.
A kind of FRP constraint concrete-filled steel tubular arch of the invention, its composition includes steel flanged beam arch rib and two bases, two
Individual basis is symmetricly set on the two ends of steel flanged beam arch rib, and the steel flanged beam arch rib includes steel pipe, FRP layers and concrete, FRP layers of bag
The outer layer of steel pipe is overlayed on, and FRP layers passes through resin-bonded into multiple tube, casting concrete in multiple tube with steel pipe.
The present invention has the advantages that compared with prior art：
First, FRP constraint concrete-filled steel tube arch of the invention is due to the FRP layers of effect of passive bound so that steel pipe is in surrender
Strengthen the confined effect of concrete and obtain to continue sufficiently development afterwards, further increase the compression strength of concrete, and
Make to produce lasting Internal Force Redistribution between steel pipe and concrete, improve bearing capacity and the modeling of FRP constraint concrete-filled steel tube arch
Property deformability.
2nd, FRP material combination steel pipe use can substitute a part of steel pipe, not only alleviate the overall weight of structure, subtract
The wall thickness of thin large diameter steel pipe, reduces the steel using amount and cost of arch rib, additionally it is possible to delay the flexing of steel pipe, improves the stress of steel pipe
Performance.
3rd, FRP layers of stable chemical nature, be difficult burn into good endurance, can solve the problem that common steel tube concrete arch steel pipe becomes rusty
The problem of erosion.Existing old arch bridge structure externally bonded FRP reinforcement material is alternatively using the principle of FRP constraint concrete-filled steel tube arch simultaneously to enter
Row anti-corrosion protection and reinforcing.
4th, steel pipe has larger axial rigidity, can be used directly as template in concrete placement, can
The manufacturing cost of template is saved, shortens the duration, while local buckling phenomenon is occurred during casting concrete can also be avoided；Together
Shi Gangguan as Wound Dies, can save the manufacturing cost and knockout course of mould in the taping process of FRP material,
Reduce production cost.
5th, when rubber layer is increased and steel pipe between for FRP layers, due to the presence of rubber layer, FRP layers of effect of contraction has been delayed
Performance, FRP layers of fracture has been postponed so that structure has more preferable ductility, while it is strong after steel pipe surrender to provide structure
The secondary rigidity changed, makes structure have enough bearing capacity deposits.The high damping characteristic of rubber layer, also can consumption s tructure vibration
Energy, reduces the earthquake response of structure, the anti-seismic performance of enhancing structure.
Brief description of the drawings
Fig. 1 is the schematic diagram of FRP constraint concrete-filled steel tubular arch of the present invention；
Fig. 2 is that the cross sectional shape of steel flanged beam arch rib 2 is circular configuration schematic diagram；
Fig. 3 is that the cross sectional shape of steel flanged beam arch rib 2 is square structure schematic diagram；
Fig. 4 is that the cross sectional shape of steel flanged beam arch rib 2 is dumbbell-shaped structure schematic diagram；
Fig. 5 is the schematic diagram that FRP layers 3 and steel pipe 4 are provided with rubber layer 6；
Fig. 6 is that arch rib of the invention is the structural representation of purlin formula arch；
Fig. 7 be steel flanged beam arch rib 2 quantity be three when, purlin formula arch cross sectional shape be triangular structure schematic diagram；
Fig. 8 be steel flanged beam arch rib 2 quantity be four when, purlin formula arch cross sectional shape be rectangular configuration schematic diagram；
Fig. 9 is that web member support 7 is composite pipe structure schematic diagram.
Specific embodiment
Specific embodiment one：Present embodiment is illustrated with reference to Fig. 1, present embodiment includes steel flanged beam arch rib 2 and two
Basis 1, two bases 1 are symmetricly set on the two ends of steel flanged beam arch rib 2, and steel flanged beam arch rib 2 two ends respectively with both sides basis 1
Affixed, the steel flanged beam arch rib 2 includes steel pipe 4, FRP layer 3 and concrete 5, FRP layers 3 outer layer for being coated on steel pipe 4, and FRP layers
3 pass through resin-bonded into multiple tube, casting concrete 5 in multiple tube with steel pipe 4, and multiple tube applies effect of contraction to concrete 5,
Self-compacting concrete is selected during concrete perfusion, preferably using the disposable continuous symmetrical casting complete of pumping-up method.Casting complete
Afterwards, by all bored closures of steel pipe, and maintenance 28 days are stood.Steel pipe 4 is welded into tubular arch, real abdomen by straight steel pipe simmering and bending or steel plate
Formula arch rib 2 continuously along the ring of steel pipe 4 and is axially located at steel tube surface by Wound Dies of steel pipe by FRP layers 3, is made one layer or many
Layer FRP pipes, are also adopted by resin-bonded between each layer fiber.In order to ensure the bond effect between FRP layers 3 and steel pipe 4, enhancing is viscous
Patch intensity and durability, before FRP fibers are pasted, should be surface-treated or blasting treatment to steel pipe 4, remove steel pipe surface
The iron rust in face, coating and paint, and cleaned.FRP fibers should be in time pasted after the completion of surface treatment, can otherwise reduce viscous
Knotting strength.Simultaneously can be by improving the maintenance speed of binding agent using equipment such as electric blanket or heaters.FRP increases for fiber
Strong plastics.The line form of steel flanged beam arch rib 2 is that parabola shaped, circular arc or stretched wire are linear.
Steel flanged beam arch rib 2 is assembled by rib-lifting section, before rib-lifting section processing, should according to Theoretical Design arch axis coordinate and
Arch rise left in advance value carries out setting-out, determines rib-lifting section number and segmental length.Rib-lifting section is welded into by straight steel pipe simmering and bending or steel plate
Pipe, carries out assembly welding, and reserve concrete press-casting hole, vibrate hole and exhaust by design requirement after physical dimension passed examination
Hole etc..
The FRP fibers of outer layer can be divided into ring fiber and axial direction fibre according to the stickup direction of fibre bundle.When outsourcing FRP steel
When pipeline overhead lifting starts to bear external load and acts on, fiber is in hoop tension state, with the increase of load, close to ultimate bearing capacity
When, ring fiber regional area initially enters pressured state because of roach life bending deformation, but before roach life unstability, it is overall
Still based on hoop tension, the influence of the stress check calculation of ring fiber to bearing capacity is negligible.Therefore circumferentially paste
Fiber mainly passes through hoop tension to steel pipe generation hoop constraint, and then limits the development of steel pipe bending deformation, improves component
Stability bearing capacity and ductility.And axial direction fibre was completely in pressured state before test specimen reaches stability bearing capacity, due to loading
Starting stage deformation is smaller, and axial direction fibre forms the tubular structure for depending on steel tube surface, and this allows it to undertake partial pressure.
With the generation of arch structure unstability, part axial direction fibre is gradually converted to tension state, Jin Erqi due to the bending deformation of steel pipe
To the effect of limitation test piece deformation development, it is possible to increase the initial post-buckling behavior of arch.
(entirely across under the parabolic arch under Uniform Load or radial equipartition load action as a example by encircleing and be subject to shaft pressuring load
Skene arch), description FRP constraint concrete-filled steel tube arch force-mechanism it is as follows：The loading starting stage, steel pipe and core concrete are straight
Connect and bear external load, and outermost FRP material is not subject to load action, and now FRP layers do not start to coagulation local products yet
Raw effect of contraction；When load is gradually increased until the Poisson's ratio of concrete more than steel, occur between concrete and steel pipe walls
Radial pressure, steel pipe radial deformation increases, and FRP is subject to radial pressure and hoop tension, and steel pipe is same to core concrete with FRP pipes
When apply effect of contraction.Now core concrete is in three dimension stress state, and steel pipe is in biaxial stress state (radial pressure phase
It is smaller for axial direction, ring, negligible), FRP layers is in hoop tension state；Surrendered as load is increased up steel pipe,
The redistribution of axial compressive force, i.e. steel pipe is produced to bear pressure and constantly reduce between steel pipe and core concrete, therefore steel pipe is from master
Bear axial compression stress and be changed into be primarily subjected to circumference stress, and because the passive bound of FRP pipes is acted on, core concrete
Cuff reinforcing obtains continuing sufficiently development, and core concrete is higher because being had by the double constraints of steel pipe and FRP pipes
Compression strength；Finally, outermost layer FRP material reaches its ultimate strength at arch rib maximum distortion, and local fracture occurs, and concrete is received
To effect of contraction reduce rapidly, steel pipe and the afforded axial compressive force of core concrete reach maximum, FRP constraint steel pipe
There is unstability in concrete arch, bearing capacity begins to decline.
Compared with conventional steel concrete arch, FRP constraint concrete-filled steel tube arch is made due to the FRP layers of effect of additional constraint
Steel pipe is obtained after surrender to the confined effect enhancing of core concrete, the compression strength of core concrete is further increased.Together
Shi Gangguan is due to bearing from the FRP layers of effect of the footpath outward pressure of constraint so that steel pipe is in more efficiently biaxial stress
State, can delay the flexing of steel pipe, improve the stress performance of steel pipe；And FRP layers of effect of contraction also causes that steel pipe is being bent
The rigidity in its section of Qu Qianhou there occurs change, improve the plastic deformation ability of arch, and arch can also be improved to a certain extent
Anti-seismic performance.Therefore, steel pipe surrender is not meant to that FRP constraint concrete-filled steel tube arch has lost bearing capacity, just phase
Instead, during the creeping after steel pipe surrender, because the passive bound of FRP pipes is acted on, the cuff reinforcing of core concrete is just obtained
To sufficiently development is continued, lasting Internal Force Redistribution is just produced between steel pipe and core concrete, so that FRP constraint steel
The bearing capacity and deformability of pipe concrete are improved significantly.
Specific embodiment two：Illustrate present embodiment with reference to Fig. 1~Fig. 4, the concrete 5 of present embodiment for it is common from
Air-free concrete or high-strength concrete.Other compositions and annexation are identical with specific embodiment one.
Specific embodiment three：FRP layers 3 of present embodiment is one or more layers plastics, and described plastics are glass
One kind or several in fibre reinforced plastics, carbon fibre reinforced plastic, Basalt fiber reinforced plastic and aromatic polyamide fiber reinforced plastics
Specific admixture is formed.Other compositions and annexation are identical with specific embodiment one or two.
Plastics described in present embodiment are fiberglass reinforced plastics, carbon fibre reinforced plastic, basalt fibre increase
It is any ratio between each composition when several specific admixtures in strong plastics and aromatic polyamide fiber reinforced plastics are formed.
Specific embodiment four：The resin of present embodiment be epoxy resin, unsaturated polyester resin, vinylite or
Phenolic resin.Other compositions and annexation are identical with specific embodiment three.
Specific embodiment five：Present embodiment, the steel flanged beam arch rib 2 of present embodiment are illustrated with reference to Fig. 2, Fig. 3 and Fig. 4
Cross sectional shape be circular, square, rectangle, ellipse or dumb-bell shape.Other compositions and annexation and specific embodiment one,
Two or four is identical.
Specific embodiment six：Present embodiment is illustrated with reference to Fig. 5, present embodiment is different from specific embodiment five
It is that it also increases and has rubber layer 6, rubber layer 6 is arranged between FRP layers 3 and steel pipe 4, between FRP layers 3 and rubber layer 6, rubber layer
With resin-bonded between 6 and steel pipe 4.Rubber layer 6 plays FRP layers 3 of constraint humidification.In above-mentioned increase rubber layer 6
In composite arch, steel pipe 4 is the ground floor constraint material of concrete 5, FRP layers 3 be concrete 5 second layer constraint material.Rubber
Layer 6 is located between two-layer constraint material, using its low-elasticity-modulus, deformation high, the characteristic easily recovered, the constraint enhancing that FRP layers 3 of buffering
Effect so that steel pipe 4 and FRP layers of 3 pairs of concrete 5 generate a time difference when constraining.Concrete 5 first, is made when being pressurized
For the steel pipe of ground floor constraint material plays effect of contraction, intensity and the deformability of concrete 5 obtain first stage enhancing, this
When, FRP layers 3 effect of contraction not yet given play to concrete 5；When external load continues to increase, the lateral expansion of concrete 5 causes
The transverse compression of rubber layer 6, the gap between FRP layers 3 and steel pipe 4 is gradually reduced, the FRP layers of effect of contraction of 3 pairs of concrete
Gradually produce, intensity and the deformability of concrete 5 obtain second stage enhancing.Rubber layer 6 has larger deformation and recovery
Characteristic, can postpone FRP layers of fracture so that structure has more preferable continuity；Meanwhile, FRP layers of 3 pairs of core concrete
The secondary rigidity that second stage constraint enhancing is strengthened there is provided structure after steel pipe surrender so that structure has enough bearing capacities
Deposit.Other compositions and annexation are identical with specific embodiment five.
Specific embodiment seven：Illustrate present embodiment with reference to Fig. 5, the rubber layer 6 of present embodiment for natural rubber or
Neoprene.This material has larger deformation and recovery characteristics, can postpone FRP layers of fracture so that structure has
More preferable continuity.Other compositions and annexation are identical with specific embodiment six.
Specific embodiment eight：Present embodiment is illustrated with reference to Fig. 7, present embodiment is different from specific embodiment seven
It is that it also increases and has several web members support 7, the quantity of steel flanged beam arch rib 2 is three, from terms of section：Three steel flanged beam arch ribs 2 are pressed
Triangle or del arrange, per adjacent steel flanged beam arch rib 2 between be provided with several web members supports 7, and web member support 7 two
End is affixed with both sides steel flanged beam arch rib 2 respectively.Present embodiment is encircleed for purlin formula.Other compositions and annexation and specific embodiment party
Formula seven is identical.
Specific embodiment nine：Present embodiment is illustrated with reference to Fig. 8, present embodiment is different from specific embodiment seven
It is that it also increases and has several web members support 7, the quantity of steel flanged beam arch rib 2 is four, from terms of section：Four steel flanged beam arch ribs 2 are pressed
Rectangle or inverted trapezoidal are arranged, several web members are provided between every adjacent steel flanged beam arch rib 2 and support 7, and the two ends of web member support 7 are divided
It is not affixed with both sides steel flanged beam arch rib 2.Present embodiment is encircleed for purlin formula.Other compositions and annexation and specific embodiment seven
It is identical.
Specific embodiment ten：With reference to Fig. 9 illustrate present embodiment, present embodiment web member support 7 be steel pipe or by
Steel pipe 4 and FRP layers 3 multiple tube being composited.Other compositions and annexation are identical with specific embodiment eight or nine.
Claims (10)
1. a kind of FRP constraint concrete-filled steel tubular arch, it is characterised in that：A kind of FRP constraint concrete-filled steel tubular arch
Including steel flanged beam arch rib (2) and two bases (1), two bases (1) are symmetricly set on the two ends of steel flanged beam arch rib (2), described
Steel flanged beam arch rib (2) includes steel pipe (4), FRP layers (3) and concrete (5), and FRP layers (3) are coated on the outer layer of steel pipe (4), and
FRP layers (3) and steel pipe (4) by resin-bonded into multiple tube, casting concrete (5) in multiple tube.
2. a kind of FRP constraint concrete-filled steel tubular arch according to claim 1, it is characterised in that：The concrete (5)
It is common self-compacting concrete or high-strength concrete.
3. a kind of FRP constraint concrete-filled steel tubular arch according to claim 1 and 2, it is characterised in that：It is described FRP layers
(3) it is one or more layers plastics, described plastics are fiberglass reinforced plastics, carbon fibre reinforced plastic, basalt fibre
One or more in reinforced plastics and aromatic polyamide fiber reinforced plastics mix and form.
4. a kind of FRP constraint concrete-filled steel tubular arch according to claim 3, it is characterised in that：The resin is ring
Oxygen tree fat, unsaturated polyester resin, vinylite or phenolic resin.
5. a kind of FRP constraint concrete-filled steel tubular arch according to claim 1,2 or 4, it is characterised in that：The real abdomen
The cross sectional shape of formula arch rib (2) is circular, square, rectangle, ellipse or dumb-bell shape.
6. a kind of FRP constraint concrete-filled steel tubular arch according to claim 5, it is characterised in that：The FRP constraint steel
Pipe concrete arch structure also includes rubber layer (6), and the rubber layer (6) is arranged between FRP layers (3) and steel pipe (4), FRP layers
(3) and rubber layer (6) between, between rubber layer (6) and steel pipe (4) with resin-bonded.
7. a kind of FRP constraint concrete-filled steel tubular arch according to claim 6, it is characterised in that：The rubber layer (6)
It is natural rubber or neoprene.
8. a kind of FRP constraint concrete-filled steel tubular arch according to claim 7, it is characterised in that：The FRP constraint steel
Pipe concrete arch structure also includes several web members support (7), and the quantity of steel flanged beam arch rib (2) is three, from terms of section：Three realities
Abdomen formula arch rib (2) is arranged that being provided with several web members between every adjacent steel flanged beam arch rib (2) supports by triangle or del
(7)。
9. a kind of FRP constraint concrete-filled steel tubular arch according to claim 7, it is characterised in that：The outsourcing FRP steel
Pipeline overhead lifting structure also includes several web members support (7), and the quantity of steel flanged beam arch rib (2) is four, from terms of section：Four steel flanged beam arches
Rib (2) is arranged that being provided with several web members between every adjacent steel flanged beam arch rib (2) supports (7) by rectangle or inverted trapezoidal.
10. a kind of FRP constraint concrete-filled steel tubular arch according to claim 8 or claim 9, it is characterised in that：The web member
The multiple tube that support (7) is composited for steel pipe or by steel pipe (4) and FRP layers (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710198688.2A CN106835936A (en) | 2017-03-29 | 2017-03-29 | A kind of FRP constraint concrete-filled steel tubular arch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710198688.2A CN106835936A (en) | 2017-03-29 | 2017-03-29 | A kind of FRP constraint concrete-filled steel tubular arch |
Publications (1)
| Publication Number | Publication Date |
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| CN106835936A true CN106835936A (en) | 2017-06-13 |
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| CN108716191A (en) * | 2018-08-16 | 2018-10-30 | 中交路桥北方工程有限公司 | A kind of concrete arch rib Covered with Angles sleeve-board group and its bracing means |
| CN109881577A (en) * | 2019-03-28 | 2019-06-14 | 北京工业大学 | A kind of steel and CFRP combined stress band and preparation method thereof |
| CN110258290A (en) * | 2019-05-29 | 2019-09-20 | 东南大学 | FRP pipe seawater coral aggregate concrete arch bridge structure and its method of construction |
| CN112593979A (en) * | 2020-11-17 | 2021-04-02 | 中煤科工集团北京华宇工程有限公司 | Roadway support device |
| CN112982137A (en) * | 2021-02-26 | 2021-06-18 | 东南大学 | Arch rib made of graphene pipe filled with self-compacting ECC concrete |
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| CN112982137B (en) * | 2021-02-26 | 2022-05-13 | 东南大学 | Arch rib made of graphene pipe filled with self-compacting ECC concrete |
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