CN106149541A - The prefabricated box bridge of a kind of prestressed stretch-draw and construction method - Google Patents
The prefabricated box bridge of a kind of prestressed stretch-draw and construction method Download PDFInfo
- Publication number
- CN106149541A CN106149541A CN201610371266.6A CN201610371266A CN106149541A CN 106149541 A CN106149541 A CN 106149541A CN 201610371266 A CN201610371266 A CN 201610371266A CN 106149541 A CN106149541 A CN 106149541A
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- Prior art keywords
- steel strand
- strand wires
- bridge
- box beam
- beam slab
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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
- 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- 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
- E01D2101/30—Metal
- E01D2101/32—Metal prestressed
Abstract
The invention discloses prefabricated box bridge and the construction method of a kind of prestressed stretch-draw, prestressed stretch-draw box bridge includes multiple prefabricated box beam Slab element, multiple box beam Slab element are longitudinal spliced, it is provided with duct along longitudinal in box beam Slab element, duct between adjacent box Beam Plate Elements is connected, and the steel strand wires of intersection subsection tension are distributed in the duct of multiple box beam slabs.Improve the integrally-built rigidity of box bridge while shortening construction period, prevent beam body downwarp, improve serviceability and the ultimate bearing capacity of bridge, strengthen the security of bridge.
Description
Technical field
The present invention relates to technical field of building construction, be specifically related to prefabricated box bridge and the construction of a kind of prestressed stretch-draw
Method.
Background technology
The domestic research to prestressed concrete starts starting from the fifties, 1956, has built up First across footpath
The Prestressed concrete simply supported beam of 20m, the so far development course of existing nearly 60 years.After 1976, China's prestressed bridge
Beam develops quickly, all achieves breakthrough at bridge type, span and construction method and technical elements, has and much in advance should
The technology of building of power concrete-bridge has obtained good international fame.With the quickening of Urbanization in China, municipal administration bridge
On the one hand beam develops towards super-long and super-wide direction, and on the other hand there is strict restriction the completion time of project of municipal administration bridge.This will
The construction technology seeking pre-stressed bridge must simultaneously meet and requires of both quality and duration.The construction of pre-stressed bridge,
Pull technology aspect reaches its maturity, and the stretching construction duration is but always a bottleneck, and technics comparing is complicated, and technical difficulty is big,
Prestress wire stretch-draw, there is also certain problem in quality.
Content of the invention
The technical problem to be solved in the present invention is, in view of the foregoing defects the prior art has, provides a kind of prestressing force
The prefabricated box bridge of stretch-draw and construction method, improve the integrally-built of box bridge while shortening construction period
Rigidity, prevents beam body downwarp, improves serviceability and the ultimate bearing capacity of bridge, strengthen the security of bridge.
The present invention solves that above-mentioned technical problem be the technical scheme is that
A kind of prefabricated box bridge of tensioning construction, including multiple prefabricated box beam Slab element, multiple boxes
Beam Plate Elements is longitudinal spliced, and along being longitudinally provided with duct in box beam Slab element, the duct between adjacent box Beam Plate Elements is connected,
The steel strand wires of intersection subsection tension are distributed in the duct of multiple box beam slabs.
Connecing technique scheme, the longitudinal length of box beam Slab element is 2～4m.
Connecing technique scheme, a diameter of 12～16mm of steel strand wires, stress is 1500～2000MPa.
Connecing technique scheme, duct inwall being arranged with bellows, the two ends of box beam Slab element are provided with piece beam steel,
It is provided with fixed mount between piece beam steel, fix bellows by fixed mount.
Connecing technique scheme, the stretching end of steel strand wires both sides is provided with sawtooth block, is provided with prestress hole in described sawtooth block
Road, prestressed pore passage and the hole link in box beam slab, the end of prestressed pore passage is provided with anchorage.
Connecing technique scheme, described anchorage end is provided with the cushion block of different-thickness, by the cushion block regulation of different-thickness
The gradient of sawtooth block.
The construction method of the prefabricated box bridge of tensioning construction described in claim 1 for the enforcement, including following step
Rapid:
1) box beam Slab element is carried out longitudinal spliced be into across box bridge；
2) fixed pulley is arranged at one end of any one box beam Slab element；
3) by steel wire rope one end longitudinally through the duct in box beam Slab element, with duct outside steel strand wires be connected, steel wire
The other end of rope is walked around fixed pulley and is connected with hoist engine；
4) hoist engine drives steel strand wires to pass through the duct in box beam Slab element by pulling steel wire rope, makes steel strand wires along hole
Road is layed in multiple box beam Slab element；
5) start to lay steel strand wires to next box beam Slab element, repeat step 2)～4), until to all box beam
Slab element completes to lay, and makes steel strand wires along duct cross-distribution in multiple box beam Slab element；
6) intersection subsection tension is carried out to prefabricated Box Girder Bridge is same across interior steel strand wires, with same stretch-draw section in every section
The steel strand wires of upper equal length are one group, carry out stretch-draw by group to steel strand wires；
7) steel strand wires that stretch-draw is good are in the milk.
Connect technique scheme, before each time stretch-draw being carried out to steel strand wires, first adjust the anchorage at two ends, duct and very heavy
The position on top, makes the axis in anchorage, jack and duct point-blank, then carries out stretch-draw again.
Connect technique scheme, described step 6) in, also include following step after being in the milk the steel strand wires that stretch-draw is good
Rapid: the adjoining cell channels not being in the milk is cleared up, with manual electric hoist, the often bundle steel strand wires in adjoining cell channels are loosened
3-5 time.
The method have the advantages that
Spliced by prefabricated Box Bridge Slab element, be not required to carry out cast in situs, by precast spliced box
Arrange the steel strand wires of intersection subsection tension in bridge, while shortening construction period, improve the overall structure of box bridge
Rigidity, prevent beam body downwarp, improve serviceability and the ultimate bearing capacity of bridge, strengthen the security of bridge.
Brief description
Fig. 1 is the longitudinal steel strand wires layout drawing of box bridge in the embodiment of the present invention；
Fig. 2 is that the A-A of Fig. 1 cuts open；
Fig. 3 is that the B-B of Fig. 1 cuts open；
Fig. 4 is the L partial schematic diagram of Fig. 3；
Fig. 5 is box bridge lateral steel strand wires layout drawing in the embodiment of the present invention；
Fig. 6 is the M close-up schematic view of Fig. 5；
Fig. 7 is the N close-up schematic view of Fig. 5；
Fig. 8 is the structural representation of sawtooth block in the embodiment of the present invention；
Fig. 9 is that in the embodiment of the present invention, schematic diagram laid by steel strand wires；
Figure 10 is the K close-up schematic view of Fig. 9；
In figure, 1-box beam Slab element, 2-steel strand wires, first group of tension steel strand of 3-, second group of tension steel strand of 4-, 5-
3rd group of tension steel strand, 6-stretching end, 7-fixed pulley, 8-steel wire rope, 9-hoist engine, 10-bellows, 11-sawtooth block, 12-
Anchorage, 13-prestressed pore passage, 14-cushion block, 15-iron wire, 16-fixed mount, 17-piece beam steel, 18-drag hook.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
Shown in reference Fig. 1～Fig. 3, the prefabricated Box Bridge of the tensioning construction in the embodiment that the present invention provides
Beam, including multiple prefabricated box beam Slab element 1, multiple box beam Slab element 1 are longitudinal spliced, and in box beam Slab element 1, edge is vertical
To being provided with duct, the duct between adjacent box Beam Plate Elements 1 is connected, and intersection segmentation is distributed in the duct of multiple box beam slabs
The steel strand wires 2 of stretch-draw；Spliced by prefabricated Box Bridge Slab element, be not required to carry out cast in situs, by precast spliced
Box bridge in arrange intersect subsection tension steel strand wires 2, while shortening construction period, improve box bridge
Integrally-built rigidity, prevents beam body downwarp, improves serviceability and the ultimate bearing capacity of bridge, strengthens the peace of bridge
Quan Xing.
Further, it is transversely provided with duct in box beam Slab element 1, in duct, be provided with the steel strand wires 2 of intersection stretch-draw.
Further, the longitudinal length of box beam Slab element 1 is 3m.
Further, a diameter of 15.24mm of steel strand wires 2, stress is 1860MPa.
Further, duct inwall being arranged with bellows 10, the two ends of box beam Slab element 1 are provided with piece beam steel 17,
Being provided with fixed mount 16 between piece beam steel 17, bellows 10 is tightened by iron wire 15 and is fixed on fixed mount 16.
Further, the stretching end 6 of steel strand wires 2 both sides is provided with sawtooth block 11, is provided with prestress hole in described sawtooth block 11
Road 13, prestressed pore passage 13 and the hole link in box beam slab, the end of prestressed pore passage 13 is provided with anchorage 12.
Further, often all different across the gradient of stretching end 6 sawtooth block 11, sawtooth block 11 is according to gradient system
Make.
Further, described anchorage 12 end is provided with the cushion block 14 of different-thickness, is regulated by the cushion block 14 of different-thickness
The gradient of sawtooth block 11.
The construction method of the box bridge of tensioning construction described in claim 1 for the enforcement, comprises the following steps:
1) box beam Slab element 1 is carried out longitudinal spliced be into across box bridge；
2) fixed pulley 7 is arranged at one end of any one box beam Slab element 1；
3) by steel wire rope 8 one end longitudinally through the duct in box beam Slab element 1, with duct outside steel strand wires 2 (specifically real
Execute steel strand wires 2 one end in example and be provided with drag hook 18, connected in steel wire rope 8 by drag hook 18) connect, the other end of steel wire rope 8 is walked around
Fixed pulley 7 is connected with hoist engine 9 (in specific embodiment, hoist engine 9 selects the hoist engine 9 of 10 tons of models)；
4) hoist engine 9 drives steel strand wires 2 to pass through the duct in box beam Slab element 1 by pulling steel wire rope 8, makes steel strand wires
2 are layed in multiple box beam Slab element 1 along duct；
5) start to lay steel strand wires 2 to next box beam Slab element 1, repeat step 2)～4), until to all boxes
Beam Plate Elements 1 completes to lay, and makes steel strand wires 2 along duct cross-distribution in multiple box beam Slab element 1；
6) carry out intersection subsection tension to prefabricated Box Girder Bridge is same across interior steel strand wires 2, break with same stretch-draw in every section
On face, the steel strand wires 2 of equal length are one group, carry out stretch-draw by group to steel strand wires 2；
7) steel strand wires 2 that stretch-draw is good are in the milk.
Further, if box beam Slab element is cast-in-place, then during tension steel strand 2, to each group of steel strand
Line 2 stretch-draw in three times, comprises the following steps:
A) when concrete strength reaches C25, stretch-draw is carried out to a part of steel strand wires 2；
B) when concrete reaches 100%, the steel strand wires 2 dividing residue remaining part branch carry out stretch-draw；
C) when concrete strength reaches 100% to box bridge across across between steel strand wires 2 carry out stretch-draw.
Further, before each time stretch-draw being carried out to steel strand wires 2, the anchorage 12 at two ends, duct and jack are first adjusted
Position, makes the axis in anchorage the 12nd, jack and duct point-blank, then carries out stretch-draw again.
Further, when intermediate plate is installed, answering complete installation, the end face of intermediate plate should be smooth.If there is intermediate plate to prestress steel
Muscle causes more serious damage, or the initial bond stress of intermediate plate is less, causes deformed bar amount of recovery to increase, after anchoring, and intermediate plate top
Face unevenness, more than phenomenons such as 1mm, should adjust limiting plate depth of groove.Stretch-draw terminates, and the amount of exposing of intermediate plate is preferably at 3～5mm, full
Foot design requires.
Further, the loading sequence of prestress wire 2 is: 0 → 10% control power σk(record jack stroke) →
30%th, the 60%th, the 80%th, 100% control power σk(hierarchical loading, classification record jack stroke) → 103% control power σk→ close
Throttle is held lotus 5 minutes → is supplied oil pressure to 103% control power σk→ slow oil return anchoring.
Further, described step 6) in, further comprising the steps of after the steel strand wires 2 that stretch-draw is good are in the milk: right
The adjoining cell channels not being in the milk is cleared up, and with manual electric hoist, the often bundle steel strand wires 2 in adjoining cell channels is loosened 3-5
Secondary；Prevent the remaining slurry of the slurry stream string in steel strand wires 2 hole being in the milk from starching solidification more than crossfire in non-tension steel strand 2 hole, make steel
Twisted wire 2 cannot lashing, the pollution that causes of grouting.
Further, as shown in FIG. 1 to 3, in the first paragraph, first group of tension steel strand 3 include being numbered A1, B1,
The steel strand wires 2 of D1, F1 and G1, second group of tension steel strand 4 includes the steel strand wires 2 being numbered C1 and E1, the 3rd group of stretch-draw steel strand
Line 5 includes the steel strand wires 2 being numbered H1, I1 and J1；In second segment, first group of tension steel strand 3 includes being numbered H2 and I2
Steel strand wires 2, second group of tension steel strand 4 includes the steel strand wires 2 being numbered C2 and J2, and the 3rd group includes being numbered A2's and G2
Steel strand wires 2.
In one embodiment of the present of invention, the course of work of the present invention:
Using steel strand wires 2 to be carrier, prestressed strand is arranged in box beam hole, the moment of flexure figure phase of its shape and beam body
Closely, it is three-dimensional space line style, be prestressing force steel hinge line to be passed through prefabricated film beam pass through group's anchor stretch-draw and each across employing friendship
Fork subsection tension technique so that it is form the entirety with certain rigidity.Thus improve the serviceability of bridge and improve the limit and hold
Loading capability.Comprise the following steps:
(1) preparation before prestress wire 2 stretch-draw: tensioner is marched into the arena and personnel march into the arena, Pressure gauge and very heavy
Top should supporting verification, Box Girder Bridge inspection and documentation prepare, and vertically and horizontally prestress wire 2 stress loss calculates and in length and breadth
Calculate to the theoretical elongation of prestress wire 2.
(2) prestress wire 2 elasticity modulus test: be the reason being computed correctly stretching force effect lower prestress steel strand wires 2
Opinion elongation, the prestress wire 2 of the different lot number of reply carries out elasticity modulus test, and result of the test reports expert engineer to recognize
Can, as the basis of prestress wire 2 theoretical elongation.
(3) the frictional force experiment in duct: during experiment, prestress wire 2 one end is equipped with dynamometer, the other end in duct
Installing stretch-draw jack, prestress wire 2 is stretched to 80% ultimate strength, and stretch-draw is divided into 8 identical loadings and unloading to increase
Amount is carried out, and the pressure of pressure, steel strand wires 2 elongation and pressure cell that the increment of loading and unloading every time, instrument show all is answered
Record, experiment is considered as the impact of the frictional influence with anchorage 12 for the prestress wire 2 and jack coefficient of friction, and that measures rubs
Wiping power should relative be stablized with coefficient of friction, change not should be greater than ± 7%, otherwise should ascertain the reason, with ensure theoretical elongation with
Actual elongation is consistent, if elongation beyond limit ± 7%, reason should be analyzed and prestressing force pulling process is modified
The pretension making it final meets the regulation of design drawing, and if desired, duct soluble oil or graphite are lubricated, prestress steel
It is rinsed after twisted wire 2 stretch-draw, dry up again.
(4) bellows 10 is fixing: only to the coordinate value removing every 3 meters of section bellowss 10 on design drawing, and bellows 10
The coordinate value of fixing every meter of section of palpus, this needs to refine coordinate value, uses CAD cartography, will the ripple that provides of a design
It the coordinate value of line pipe 10, is plotted in the coordinate system of CAD, then connect into a full circle slip with " multi-section-line "；Finally find out every meter
Coordinate, does one according to bellows 10 in the Latitudinal section situation every a meter (or a certain distance) with the reinforcing bar of Ф 10 and fixes
Frame 16, fixed mount 16 is fixing with piece beam steel 17, and bellows 10 is tightened with fixed mount 16 20# iron wire 15, when prefabricated, adjacent
Piece beam must assure that the docking completely of pre-buried bellows 10.
(5) prestress wire 2 is laid: the longest 84 meters of leaps two of this bridge plate prestress wire 2 step into row stretch-draw, bent
The three-dimensional trend of line coordinates XYX, slope width is very big, having many bends or curves, often restraints steel strand wires 2 about 1 ton multiple, and steel strand wires 2 are difficult to lay, and use
10 tons of elevators are placed at mounted bridge plate stretching end 6 to be worn two bundle pulley gears traction steel strand wires 2 and walks, and one end leads to
Crossing hoist engine 9, the other end is restrainted by steel wire rope 8 drawing steel stranded wire 2, and steel strand wires 2 are restrainted termination one drag hook 18 of weldering and carried out steel strand 2
Bundle.
(6) prestress wire 2 of prefabricated box beam is two ends stretch-draw, with intersecting subsection tension across using, packet with
On one stretch-draw section, the presstressed reinforcing steel of equal length is one group, and because steel strand wires 2 are up to 84 meters, profile amplitude is big, it is considered to stress is not
Uniformly, the bad construction of stretch-draw end, opens a hole reserved joint bar from bridge plate, and people is complete to tensioned at one end at the bottom of plate from hole
After, the other end is mended to open and is reduced loss of prestress, then fills preformed hole formwork, often across stretching end 6 sawtooth block 11 inclined slope
Spend all different, will be calculated by CAD diagram, further according to often across stretching end 6 sawtooth block 11 gradient making sawtooth block 11
Device, the cushion block 14 of tension ground tackle 12 gradient different-thickness adjusts, and during because carrying out stretch-draw operation, adjusts anchorage 12 He
The position of jack, makes the position of stretching force overlap with the tangent line of duct center line end, then just can carry out stretch-draw, only
Duct, anchor ring and jack three centering, just will not increase duct friction loss.
(7) to cast-in-place box-girder, using each across as an independent construction section, and presstressed reinforcing steel is two ends simultaneous tensions,
Packet is one group with the identical prestress wire 2 of arrangement form in each construction section, and stretch-draw in three times, stretch-draw is to scheme for the first time
The fixed numbering extraction numbering of part steel strand wires 2 of lateral treat that concrete strength reaches C25 and gets final product stretch-draw, and the remaining number steel strand wires 2 of stretch-draw for the second time are treated
Concrete reaches 100% and gets final product stretch-draw, stretch-draw for the third time when concrete strength reaches 100% can stretch-draw across across between prestress steel twist
Line 2 is numbered, and because of cast-in-place across design steel strand wires 2 sample different in size, some steel strand wires 2 stretching ends 6 are in the middle of plate, it is necessary to open from plate
Hole, enters stretch-draw at the bottom of plate, and people and jack are at the bottom of plate, and onboard, upper and lower intercommunication carries out stretch-draw to stretching machine operator.
(8) loading sequence of deformed bar: 0 → 10% control power σk(record jack stroke) → the 30%th, the 60%th,
80%th, 100% control power σk(hierarchical loading, classification record jack stroke) → 103% control power σk→ closedown throttle holds lotus 5
Minute → supply oil pressure to 103% control power σk→ slow oil return anchoring.
(9) when carrying out stretch-draw operation, the position of anchorage 12 and jack should be adjusted, make duct, anchorage the 12nd, axis
Point-blank, then carrying out stretch-draw, when intermediate plate is installed, answering complete installation, the end face of intermediate plate should be smooth.If there is intermediate plate pair
Deformed bar causes more serious damage, or the initial bond stress of intermediate plate is less, causes deformed bar amount of recovery to increase, anchoring
After, intermediate plate end face unevenness, more than phenomenons such as 1mm, should adjust limiting plate depth of groove.Stretch-draw terminates, and the amount of exposing of intermediate plate preferably exists
3～5mm, meets design and requires.
(10) for preventing the remaining slurry of the slurry stream string in steel strand wires 2 hole be in the milk to more than crossfire in non-tension steel strand 2 hole
Slurry solidification, make steel strand wires 2 cannot lashing, the pollution that causes of grouting should clear up in time, grouting complete after to not being in the milk
The manual electric hoist in steel strand wires 2 duct will often be restrainted steel strand wires 2 and loosen 3-5 time.
The above presently preferred embodiments of the present invention that is only, can not limit the interest field of the present invention with this certainly,
Therefore the equivalence change made according to scope of the present invention patent, still belongs to protection scope of the present invention.
Claims (9)
1. the prefabricated box bridge of a tensioning construction, it is characterised in that include multiple prefabricated box beam Slab element,
Multiple box beam Slab element are longitudinal spliced, are provided with duct, the hole between adjacent box Beam Plate Elements along longitudinal in box beam Slab element
Road is connected, and the steel strand wires of intersection subsection tension are distributed in the duct of multiple box beam slabs.
2. the prefabricated box bridge of tensioning construction according to claim 1, it is characterised in that box beam Slab element
Longitudinal length be 2～4m.
3. the prefabricated box bridge of tensioning construction according to claim 1, it is characterised in that the diameter of steel strand wires
Being 12～16mm, stress is 1500～2000MPa.
4. the prefabricated box bridge of tensioning construction according to claim 1, it is characterised in that overlap on the inwall of duct
Being provided with bellows, the two ends of box beam Slab element are provided with piece beam steel, are provided with fixed mount between piece beam steel, solid by fixed mount
Determine bellows.
5. the prefabricated box bridge of tensioning construction according to claim 1, it is characterised in that steel strand wires both sides
Stretching end is provided with sawtooth block, is provided with prestressed pore passage, prestressed pore passage and the hole link in box beam slab in described sawtooth block,
The end of prestressed pore passage is provided with anchorage.
6. the prefabricated box bridge of tensioning construction according to claim 5, it is characterised in that described anchorage end
It is provided with the cushion block of different-thickness, by the gradient of the cushion block regulation sawtooth block of different-thickness.
7. the construction method of the prefabricated box bridge of tensioning construction described in claim 1 for the enforcement, it is characterised in that bag
Include following steps:
1) box beam Slab element is carried out longitudinal spliced be into across prefabricated box bridge；
2) fixed pulley is arranged at one end of any one box beam Slab element；
3) by steel wire rope one end longitudinally through the duct in box beam Slab element, with duct outside steel strand wires be connected, steel wire rope
The other end is walked around fixed pulley and is connected with hoist engine；
4) hoist engine drives steel strand wires to pass through the duct in box beam Slab element by pulling steel wire rope, makes steel strand wires spread along duct
It is located in multiple box beam Slab element；
5) start to lay steel strand wires to next box beam Slab element, repeat step 2)～4), until to all box beam slab lists
Unit completes to lay, and makes steel strand wires along duct cross-distribution in multiple box beam Slab element；
6) intersection subsection tension is carried out to prefabricated Box Girder Bridge is same across interior steel strand wires, with phase on same stretch-draw section in every section
It is one group with the steel strand wires of length, by group, stretch-draw is carried out to steel strand wires；
7) steel strand wires that stretch-draw is good are in the milk.
8. the construction method of the prefabricated box bridge of tensioning construction according to claim 7, it is characterised in that every
Before once stretch-draw being carried out to steel strand wires, first adjust the anchorage at two ends, duct and the position of jack, make anchorage, jack and hole
The axis in road point-blank, then carries out stretch-draw again.
9. the construction method of the prefabricated box bridge of tensioning construction according to claim 7, it is characterised in that institute
State step 6) in, further comprising the steps of after the steel strand wires that stretch-draw is good are in the milk: to the adjacent holes not being in the milk
Road is cleared up, and loosens the often bundle steel strand wires in adjoining cell channels 3-5 time with manual electric hoist.
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| CN201610371266.6A CN106149541B (en) | 2016-05-30 | 2016-05-30 | Prestressed tensioning prefabricated box type bridge and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424525A (en) * | 2020-03-31 | 2020-07-17 | 成都市路桥经营管理有限责任公司 | Large-span superposed beam of high-speed railway and construction method thereof |
| CN112281660A (en) * | 2020-09-17 | 2021-01-29 | 济南利民路桥工程有限责任公司 | Bridge body prestress tensioning method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424525A (en) * | 2020-03-31 | 2020-07-17 | 成都市路桥经营管理有限责任公司 | Large-span superposed beam of high-speed railway and construction method thereof |
| CN112281660A (en) * | 2020-09-17 | 2021-01-29 | 济南利民路桥工程有限责任公司 | Bridge body prestress tensioning method |
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