CN107165060A - A kind of anti-bend reinforced device of bridge prestress high-strength steel cord - Google Patents
A kind of anti-bend reinforced device of bridge prestress high-strength steel cord Download PDFInfo
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- CN107165060A CN107165060A CN201710499327.1A CN201710499327A CN107165060A CN 107165060 A CN107165060 A CN 107165060A CN 201710499327 A CN201710499327 A CN 201710499327A CN 107165060 A CN107165060 A CN 107165060A
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a kind of anti-bend reinforced device of bridge prestress high-strength steel cord, anchor including steel wire rope and anchoring steel wire rope, anchor includes the first T-shaped angle steel, the second T-shaped angle steel and afterbody that are integrally fixed high-strength bolt with holes, and the first T-shaped angle steel and the second T-shaped steel angle structure are identical；Two first T-shaped angle steel correspond to the two ends for the bottom surface for being installed in bridge matrix respectively, several second T-shaped angle steel are equidistantly installed in the bottom surface of bridge matrix corresponding between two first T-shaped angle steel respectively, the free end of two screw rods corresponds to be installed on the first T-shaped angle steel respectively, and be screw-locked at by the nut of arranging on the first T-shaped angle steel, steel wire rope is arranged in each second T-shaped angle steel, and two ends are each passed through the afterbody of screw rod, and the part passed through is tightened together with corresponding steel wire rope by buckling piece.Compared with prior art, by the tensioning of high-strength steel cord, that is, prestressed application is carried out, the interface delaminating damage of back-up coat can be effectively prevented from.
Description
Technical field
The present invention relates to Technology Bridge Strengthening field, more specifically to a kind of bridge prestress high-strength steel cord bending resistance
Bracing means.
Background technology
Bridge, as the important component of lifeline engineering, is transport hub " throat ", and the destruction of bridge will cause
The interruption of lifeline, the loss caused is inestimable.Bridge often due to outdoor environment works easy aging, design standard improve,
Traffic accident causes the factors such as damage, and bridge need to be reinforced.
At present, China has much for the reinforcement means of bridge structure, and conventional method has increasing section area method, Covered with Angles
Method, bonding steel plate method, stickup fibre method, prestressing etc.；These traditional reinforcement means have problems with；(1) glue
Steel method and Baogang's method material are poor from great, construction complexity, resistance to corrosion；(2) sticking FRP method to rigidity improve not substantially,
It is not suitable for the low situation of concrete strength, and easily occurs the interface delaminating damage of back-up coat；(3) traditional Technology Bridge Strengthening
Reinforcing engineering amount is big, labour cost is high, later maintenance is costly, and the influence of Construction on Environment is big, it is impossible to accomplish green construction.
Meanwhile, have deadweight small, anti-although being widely used in the steel strand wires mesh sheet reinforcement technique in building structure strengthening field
The advantages of fire, environmental protection, good endurance, easy construction and superior reinforcement performance, but steel strand wires mesh sheet reinforcement technique is generalized at present
Bridge strengthening field still suffers from problems with：(1) reinforcement technique easily peeling-off destruction, badly influences steel strand wires intensity
Play, be not suitable with the bridge strengthening field that load case is various, engineering-environment is complicated；(2) building structure strengthening field is directed to, its
The steel strand wires diameter of selection is smaller, and this steel strand wires diameter is can not to adapt to big with reinforcing engineering amount, reinforces demand high
Bridge strengthening field.
In consideration of it, inventor furthers investigate to above mentioned problem, there is this case generation then.
The content of the invention
It is an object of the invention to provide a kind of anti-bend reinforced device of bridge prestress high-strength steel cord, it, which can be prevented effectively from, adds
Gu the interface delaminating damage of layer, it is ensured that the globality of structure, and can adapt to bridge strengthening presence quantities is big, span big,
Reinforcing demand is high and Fatigue Load, and it is simple in construction be easily achieved, it is practical.
To reach above-mentioned purpose, solution of the invention is：
A kind of anti-bend reinforced device of bridge prestress high-strength steel cord, including high-strength steel cord and the anchoring high tensile steel wire
The anchor of rope, the anchor includes the first T-shaped angle steel being integrally fixed, the second T-shaped angle steel being integrally fixed
The high-strength bolt with holes with afterbody, the first T-shaped angle steel is identical with the described second T-shaped steel angle structure；
First T-shaped angle steel described in two corresponds to the two ends for the bottom surface for being installed in bridge matrix respectively, and several are described second T-shaped
Angle steel is equidistantly installed in the bottom surface of the bridge matrix corresponding between the first T-shaped angle steel described in two respectively, high-strength described in two
The free end of screw rod corresponds to is installed on the described first T-shaped angle steel respectively, and is screw-locked at described the by the high-strength nut of arranging
On one T-shaped angle steel, the high-strength steel cord is arranged in each second T-shaped angle steel, and two ends are corresponded to through described high-strength respectively
The afterbody of screw rod, and the part passed through tightened together with the corresponding high-strength steel cord by buckling piece.
The first T-shaped angle steel includes orthogonal first level steel plate and the first vertical steel plate, the second T-shaped angle
Ladle includes orthogonal second horizontal steel plate and the second vertical steel plate, the first vertical steel plate and the described second vertical steel plate
It is arranged in parallel.
The first level steel plate and second horizontal steel plate correspond to the high-strength spiral shell by high-strength bolt and arranging respectively
Mother is screw-locked on the bridge matrix.
The first anchor hole passed through for the free end of the high-strength bolt, the height are offered on the first vertical steel plate
The free end of strong screw rod is screw-locked on the described first vertical steel plate by the high-strength nut of arranging；On each second vertical steel plate
Offer the second anchor hole passed through for the high-strength steel cord.
The high-strength steel cord corresponds at each second vertical steel plate is installed with high-strength steel sleeve respectively.
The buckling piece is square-shaped aluminium button.
After said structure, the present invention has the advantages that：Due to by tensioning high-strength steel cord and by two ends
The bottom surface of bridge matrix is anchored in, using this high-strength steel cord as reinforcement material, compared with prior art, it can be effectively prevented from passing
The interface delaminating damage of the back-up coat of system bracing means, it is ensured that consolidation effect, it is ensured that the globality of structure, bears the fatigue of bridge
Load, and can effectively improve bridge Bending Fatigue Behavior, and its is simple in construction, be easily achieved, it is practical；
Further, it is arranged at due to this bracing means on the bottom surface of bridge matrix, is bridge surface consolidation device, therefore
Construction period does not need close traffic；
Further, the cooperation that high-strength steel cord passes through high-strength bolt and high-strength nut and high-strength bolt and high-strength nut
Draw on the relevant position of bridge matrix, therefore understand that this bracing means is repeatable and remove and install, and the low cost of each reinforcement material,
Integral construction cost is relatively low；
Further, by the way that each high-strength steel sleeve is individually fixed at each second T-shaped angle steel, so that high-strength steel cord
It is consolidated on each second T-shaped angle steel, improves the bearing capacity of bridge.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
The enlarged diagram that Fig. 2 is A in Fig. 1.
The enlarged diagram that Fig. 3 is B in Fig. 1.
In figure；
1- bridge matrix 2- high-strength steel cords
The T-shaped angle steel 31- first level steel plates of 3- first
The vertical anchor holes of steel plate 321- first of 32- first
The T-shaped horizontal steel plates of angle steel 41- second of 4- second
The vertical anchor holes of steel plate 421- second of 42- second
5- high-strength bolt 51- mounting holes
52- high-strength nut 61- high-strength bolts
62- high-strength nut 7- aluminium buttons
The high-strength steel sleeves of 8-
Embodiment
In order to which technical scheme is explained further, the present invention is explained in detail below by specific embodiment
State.
A kind of anti-bend reinforced device of bridge prestress high-strength steel cord of the present invention, as Figure 1-3, including high-strength steel cord
2 are installed on bridge matrix with the anchor for anchoring this high-strength steel cord 2, length direction of the high-strength steel cord 2 along bridge matrix 1
On 1 bottom surface, this anchor includes the first T-shaped angle steel 3 being integrally fixed, the second T-shaped angle steel 4 and height being integrally fixed
Strong screw rod 5, the wherein tail end of high-strength bolt 5 are provided with mounting hole 51, and the first T-shaped angle steel 4 of T-shaped angle steel 3 and second is respectively by two pieces
Angle steel is formed by fixedly connecting, and the first T-shaped angle steel 3 is identical with the structure of the second T-shaped angle steel 4.
Specifically, as shown in Figure 1-2, two piece of first T-shaped angle steel 3 is respectively arranged in the two of the bottom surface clear span of bridge matrix 1
End, some blocks of the second T-shaped angle steel 4 are equally spacedly installed between the bottom surface clear span of bridge matrix 1, wherein the first T-shaped angle steel 3 is wrapped
The vertical steel plate 32 of orthogonal first level steel plate 31 and first is included, the second T-shaped angle steel 4 includes orthogonal second level
The vertical steel plate 42 of steel plate 41 and second, the horizontal steel plate 41 of first level steel plate 31 and second is arranged side by side by the respective face of two blocks of angle steel
Linking is formed, and the first vertical steel plate 42 of vertical steel plate 32 and second is formed by stacking by the respective face of two blocks of angle steel；First level
Bottom surface of the horizontal steel plate 41 of steel plate 31 and second with bridge matrix 1 is in contact, the first vertical steel plate of vertical steel plate 32 and second
42 length direction respectively with the bottom surface of bridge matrix 1 is vertically arranged.In the present invention, the quantity of the second T-shaped angle steel 4 is according to reality
The length and practice of construction situation of border bridge matrix 1 are laid, and are not limited herein.
Preferably, high-strength steel cord is the steel wire rope for the 6*7+IWS that diameter is more than 8mm, in the present embodiment, this high-strength steel
Cord is zinc coated high strength steel cord.
Further, the two ends of the bottom surface of bridge matrix 1 are opened up respectively with the both sides of corresponding first level steel plate 31
Have between the first mounting hole of relative position, the two ends of the bottom surface of bridge matrix 1 with the both sides of corresponding second horizontal steel plate 41
The second mounting hole of relative position is offered respectively, and is separately installed with relatively in the first mounting hole and the second mounting hole of position high-strength
Bolt 61, now by building field commonly use bar planting method by each high-strength bolt 61 respectively with corresponding first mounting hole,
Second mounting hole links together, i.e., each high-strength bolt 61 bonds together with bridge matrix；Then pass through the high-strength spiral shell of arranging
The horizontal steel plate 41 of first level steel plate 31 and second is screw-locked at the bottom surface of bridge matrix 1, i.e., the first T-shaped angle steel 3 by mother 62 respectively
It is fixedly installed in the second T-shaped angle steel 4 on the bottom surface of bridge matrix 1.It is preferred that to reach the T-shaped angle steel 3 of all first and
Two T-shaped angle steel 4 are tightly fixed on the bottom surface of bridge matrix 1, and four spacing phases are offered on every block of first level steel plate 31
Deng the first mounting hole, offer the second equal mounting hole of four spacing on every piece of second horizontal steel plate 41.Preferably,
The diameter of high-strength bolt 61 is 5 times of the hole depth of the first mounting hole or the second mounting hole, and its diameter is not less than 150mm.
Further, the first anchor hole 321, each second vertical steel plate 42 are offered on two piece of first vertical steel plate 32 respectively
It is upper to offer the second anchor hole 421 respectively, and bottom surface of the anchor hole 421 of each first anchor hole 321 and second along bridge matrix 1
Length direction is on same straight line, and above-mentioned high-strength bolt 5 is separately installed with two first anchor holes 321, two high-strength bolts 5
Free end is screw-locked on the corresponding first vertical steel plate 32 by the high-strength nut 52 of arranging respectively, and the tail of two high-strength bolts 5
End face is provided opposite to.It is preferred that being screwed between the free end of high-strength bolt 5 and corresponding high-strength nut 52 has pad, with effective
Ground prevents corresponding high-strength nut 52 from loosening.Preferably, the length of high-strength bolt 5 is 10 times of the diameter of high-strength bolt 5, and
Its length is not shorter than 120mm.
In addition, as shown in Fig. 2 the processing at the two ends of high-strength steel cord 2 is：High-strength steel cord 2 sequentially passes through each second anchoring
Hole 421, the two ends of subsequent high-strength steel cord 2 are each passed through the mounting hole 51 of corresponding high-strength bolt 5, and the part passed through and phase
Corresponding high-strength steel cord 2 is tightened together by buckling piece, and the part passed through is remaining is not shorter than 50mm.In the present embodiment
In, buckling piece is aluminium button 7, and high-strength steel cord 2 both passes through aluminium through the part of mounting hole 51 and the appropriate section of high-strength steel cord
Button 7, and compressed aluminium button 7 by existing common hydraulic test so that high-strength steel cord 2 passes through part and the height of mounting hole 51
The appropriate section of strong steel wire rope 2 tightens together.It is preferred that to prevent high-strength steel cord 2 from being extracted from aluminium button 7, high tensile steel wire
The both ends of rope 2 are exposed a little from corresponding aluminium button 7 parcel respectively, and the anchorage length at the two ends of high-strength steel cord 2 is high-strength
5 times of the diameter of steel wire rope 2.
In the present invention, the quantity of high-strength steel cord 2 is selected according to the width of practice of construction Bridge matrix 1, with reasonable
Ground distribution applies prestressing force to bridge matrix 1.
The bottom surface of bridge matrix 1 along its cross-directional distribution be equiped with some high-strength steel cords 2 when, exemplified by 3, two
The vertical steel plate 32 of block first equidistantly opens up three the first anchor holes 321 along in the cross-directional of the bottom surface of bridge matrix 1 respectively,
And each first anchor hole 321 on two piece of first vertical steel plate 32 is opened up relatively two-by-two respectively, edge on each second vertical steel plate 42
The cross-directional of the bottom surface of bridge matrix 1 is respectively equipped with the second anchor hole 421 corresponding to each first anchor hole 321 so that each
One anchor hole 321 and the length direction of bottom surface of the second corresponding anchor hole 421 along bridge matrix 1 are respectively at three straight lines
On.Meanwhile, above-mentioned high-strength bolt is separately installed with the manner aforesaid on each first anchor hole 321.
Further, whenever high-strength steel cord 2 is passed through after second anchor hole 421, a high-strength steel bushing can be all inserted in
Pipe 8, after tensioning is fixed on corresponding first T-shaped angle steel 3 respectively at the two ends of high-strength steel cord 2, in each high-strength steel sleeve 8
Bonding agent is filled, so that fixation is in contact with the corresponding second vertical steel plate 42 respectively for one end of each high-strength steel sleeve 8, so that
So that high-strength steel cord 2 is consolidated on each second T-shaped angle steel 4 again, to improve the endurance of bridge.Wherein, bonding agent is used
Anchoring adhesive or epoxy glue.Preferably, the internal diameter of high-strength steel sleeve 8 2mm more than the diameter of high-strength steel cord 2, and high-strength steel bushing
The wall thickness of pipe 8 is more than 5mm, and its length is 10 times of the diameter of high-strength steel cord 2, and more than 100mm.
Compared with prior art, by the tensioning of high-strength steel cord 2, that is, prestressed application is carried out, can effectively kept away
Exempt from the interface delaminating damage of back-up coat, and thus the mounting means of bracing means understands that this bracing means can adapt to bridge and add
Admittedly the quantities existed is big, span is big, reinforcing demand is high and Fatigue Load, and simple in construction, easy construction, quick, fit
Bridge, beam slab for Lack of support, the bridge bending resistance Fatigue Consolidation with damage.
The present invention also proposes the construction party according to the anti-bend reinforced device of previous embodiment Bridge Hight strength cable rope
Method：
(1), according to practice of construction situation, high-strength steel cord 2, the quantity of the second T-shaped angle steel 4 and high-strength bolt 5 are determined, and
Determine that installation site, high-strength bolt 5 that the first T-shaped angle steel 4 of T-shaped angle steel 3 and second equidistantly installs along the clear span of bridge matrix 1 are consolidated
Dingan County is passed through on each second vertical steel plate 42 mounted in the position of the first anchor hole 321 of the first T-shaped angle steel 3 and high-strength steel cord 2
The second anchor hole 421 position；
(2), the quantity determined according to the in step (1) first T-shaped angle steel 4 of T-shaped angle steel 3 and second, prepares size identical
Angle steel, splicing constitutes the first T-shaped angle steel 4 of T-shaped angle steel 3 and second to each angle steel two-by-two respectively, and the first T-shaped angle steel 3 includes first
The vertical steel plate 32 of horizontal steel plate 31 and first, the second T-shaped angle steel 4 includes the second horizontal steel plate 41 and the second vertical steel plate 42；
(3), be drilled with respectively on every block of first level steel plate 31, the second horizontal steel plate 42 four spacing it is equal first
Mounting hole, the second mounting hole, the first anchor hole 321 is drilled with every block of first vertical steel plate 32, the second vertical steel plate 42 respectively
With the second anchor hole 421；
(4) dabbing processing, is carried out to the bottom surface of bridge matrix 1, after the completion of dabbing processing, by the determined in step (1)
The installation site of the one T-shaped angle steel 4 of T-shaped angle steel 3 and second is drilled with bridge mounting hole, and each installation position respectively along bridge matrix clear span
The bridge mounting hole put is pacified with the first mounting hole on corresponding first level steel plate 31, the second horizontal steel plate 41, second respectively
Dress hole is corresponding, and the big 2mm of diameter of the high-strength bolt 5 prepared in the aperture ratio step (1) of above-mentioned bridge mounting hole, and hole depth is hole
6 times of footpath, and aperture is more than 100mm；
(5), bridge mounting hole all in cleanup step (3) and (4), first, second anchor hole, and first, second peace
Hole is filled, and each high-strength bolt 61 prepared in step (1) is individually fixed in corresponding bridge mounting hole by the way of bar planting；
Treat that intensity reaches requirement, by the first level steel plate 31 in step (4) pass through the first be drilled with mounting hole with it is corresponding high-strength
Bolt 61 is installed together, and screws in the high-strength nut 62 of arranging so that the first T-shaped angle steel 3 is fixed on the bottom surface of bridge matrix 1
The two ends of clear span；Meanwhile, the second horizontal steel plate 41 in step (4) is passed through each second mounting hole for being bored with it is corresponding high-strength
Bolt 61 is installed together, and screws in the high-strength nut 62 of arranging so that the second T-shaped angle steel 4 is fixed on the bottom surface of bridge matrix 1
In clear span；
(6), the high-strength steel cord 2 in step (1) is cut out according to bridge matrix clear span length, is considered as when cutting out
Construction surplus, the two ends of high-strength steel cord 2 when being tightened to high-strength steel cord 2 and applying prestressing force length remaining when anchoring；
(7) the high-strength steel cord 2 in step (6), is run through into the second anchor in step (3) on each second vertical steel plate 42
The two ends of high-strength steel cord are carried out tensioning by solid hole 421, and being required according to prestressed, and two ends initially pass through respectively it is corresponding
Aluminium button 7, afterwards through the afterbody of the high-strength bolt 51 in step (1), is then passed through original aluminium button passed through once, now high-strength steel
The both ends of cord 2 are exposed a little from aluminium button respectively, final to be withheld aluminium tightly using hydraulic test, wear high-strength steel cord 2
The part for crossing high-strength bolt 51 tightens together with the appropriate section of high-strength steel cord 2；
(8), treat after the completion of step (7), the free end of the high-strength bolt 5 in step (7) is respectively arranged in corresponding
On one anchor hole 311 and pad is inserted in, then screws in the high-strength nut 52 of arranging so that high-strength bolt 5 is fixed on corresponding
On one vertical steel plate 32, and high-strength steel cord 2 is in tensioning state, that is, carry out prestress application；
(9), in step (7), high-strength steel cord 2 is often passed through and is inserted in one piece of second vertical steel plate 42, high-strength steel cord 2
One high-strength steel sleeve 8, after high-strength steel cord 2 completes step (8), the injection anchoring adhesive in each high-strength steel sleeve 8 will be high-strength
Steel wire rope 2 is consolidated on each second T-shaped angle steel 4；
(10), after the anchoring adhesive intensity in step (9) reaches requirement, you can open；Fail if being reinforced because of environmental factor
When, detachable high-strength steel cord 2 (prestressing force of high-strength steel cord 2 is first discharged, i.e., first tears the aluminium button 7 at the two ends of high-strength steel cord 2 open, then
High-strength nut 52 on high-strength bolt 5 is screwed out, last cutting wire rope), repeat step (6)-(10) and reinforced again.
It should be noted that：Foregoing bracing means can first be prefabricated in the factory, and then be carried out during site operation assembled.
After above-mentioned construction method, because bracing means is prefabricated in the factory in advance, so its reinforcing precast is filled
Put that precision is higher, quality preferably, and it is at the scene in work progress, can directly carry out assembly and use, and field conduct efficiency high, applies
Work is quick.
It the foregoing is only the preferred embodiment of the present embodiment, all equivalent changes done with scope of the invention as claimed
And modification, scope of the presently claimed invention all should be belonged to.
Claims (6)
1. a kind of anti-bend reinforced device of bridge prestress high-strength steel cord, it is characterised in that：Including high-strength steel cord and anchoring institute
State the anchor of high-strength steel cord, the first T-shaped angle steel that the anchor includes being integrally fixed, the be integrally fixed
Two T-shaped angle steel and afterbody high-strength bolt with holes, the first T-shaped angle steel is identical with the described second T-shaped steel angle structure；
First T-shaped angle steel described in two corresponds to the two ends for the bottom surface for being installed in bridge matrix, several described second T-shaped angle steel respectively
Equidistantly it is installed in the bottom surface of the bridge matrix respectively to correspond between the first T-shaped angle steel described in two, high-strength bolt described in two
Free end correspond to be installed on the described first T-shaped angle steel respectively, and it is T-shaped by the high-strength nut of arranging to be screw-locked at described first
On angle steel, the high-strength steel cord is arranged in each second T-shaped angle steel, and two ends are corresponded to through the high-strength bolt respectively
Afterbody, and the part passed through tightened together with the corresponding high-strength steel cord by buckling piece.
2. a kind of anti-bend reinforced device of bridge prestress high-strength steel cord according to claim 1, it is characterised in that：It is described
First T-shaped angle steel includes orthogonal first level steel plate and the first vertical steel plate, and the second T-shaped angle steel includes mutually hanging down
Straight the second horizontal steel plate and the second vertical steel plate, the first vertical steel plate be arranged in parallel with the described second vertical steel plate.
3. a kind of anti-bend reinforced device of bridge prestress high-strength steel cord according to claim 2, it is characterised in that：It is described
The high-strength nut that first level steel plate and second horizontal steel plate are corresponded to by high-strength bolt with arranging respectively is screw-locked at described
On bridge matrix.
4. a kind of anti-bend reinforced device of bridge prestress high-strength steel cord according to claim 2, it is characterised in that：It is described
The first anchor hole passed through for the free end of the high-strength bolt, the freedom of the high-strength bolt are offered on first vertical steel plate
Hold and be screw-locked at by the high-strength nut arranged on the described first vertical steel plate；Offered on each second vertical steel plate for described
The second anchor hole that high-strength steel cord is passed through.
5. a kind of anti-bend reinforced device of bridge prestress high-strength steel cord according to claim 2 or 4, it is characterised in that：
The high-strength steel cord corresponds at each second vertical steel plate is installed with high-strength steel sleeve respectively.
6. a kind of anti-bend reinforced device of bridge prestress high-strength steel cord according to claim 1, it is characterised in that：It is described
Buckling piece is square-shaped aluminium button.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710222708 | 2017-04-07 | ||
| CN2017102227085 | 2017-04-07 |
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| CN107165060B CN107165060B (en) | 2023-03-07 |
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| CN201710499327.1A Active CN107165060B (en) | 2017-04-07 | 2017-06-26 | Bridge prestressing force high strength wire rope bending resistance reinforcing apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110258776A (en) * | 2019-07-24 | 2019-09-20 | 陈菲 | A kind of prestressed bridge and its manufacturing method and application |
| CN111101729A (en) * | 2019-12-31 | 2020-05-05 | 中国矿业大学 | Floor slab reinforcing method |
| CN113790760A (en) * | 2021-09-18 | 2021-12-14 | 科顿环境科学股份有限公司 | Supervision method for installation of super-large-span steel structure planar truss |
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