CN107984610A - A kind of prestressing force small box girder production method - Google Patents
A kind of prestressing force small box girder production method Download PDFInfo
- Publication number
- CN107984610A CN107984610A CN201711175269.3A CN201711175269A CN107984610A CN 107984610 A CN107984610 A CN 107984610A CN 201711175269 A CN201711175269 A CN 201711175269A CN 107984610 A CN107984610 A CN 107984610A
- Authority
- CN
- China
- Prior art keywords
- flume
- section
- presstressed reinforcing
- reinforcing steel
- box girder
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
-
- 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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
Abstract
The invention discloses a kind of prestressing force small box girder production method, the prestressing force small box girder is divided into the flume section of centre and the anchoring section positioned at both ends, flume section is poured first, remain for the flume of arrangement prestress muscle in advance on the web of flume section, and two tensioning holes for being used for tensioned prestressing bar are preset in flume bottom interval a distance；By presstressed reinforcing steel lashing in the flume that flume section is reserved, presstressed reinforcing steel after lashing and the steel reinforcement cage of the anchoring section at both ends are fixedly linked, and pour the anchoring section positioned at both ends, after anchoring section pours curing, the tensioning value and stretch value that presstressed reinforcing steel down tensioning, inspection presstressed reinforcing steel reach are met the requirements by two horizontal Zhang Kongyong tensioning equipments of flume bottom；Flume in flume section is poured, third time is completed and pours, tensioning equipment is removed after curing, completes the making of whole prestressing force small box girder.Mud jacking is more closely knit in present invention making small box girder prestressed stretch-draw, while improves the utilization rate of presstressed reinforcing steel.
Description
Technical field
The present invention relates to bridge construction field, is related to a kind of small box girder production method, and in particular to a kind of small case of prestressing force
Beam production method.
Background technology
Prefabricated continuous small box girder because its is simple in structure, easy construction, it is cheap, save the advantages that duration, in China
With quite varied in Short/Medium Span Bridge.In such precast beam, presstressed reinforcing steel is essential part.At this stage
More mature method for stretching is post stretching and pre-tensioning system in pre-stress construction.Whether contact according to presstressed reinforcing steel with concrete,
It is divided into bonded prestressed concrete and unbonded prestressed concrete again.Continuous small box girder it is prefabricated in, presstressed reinforcing steel is adopted
With post stretching, adhesive form is to have bonding.But post stretching is used, problems with is occurred with existing construction technology：(1) it is pre-
Stress rib end stretching force is larger, and the stretching force at span centre position is often smaller；(2) after tension of prestressed tendon, there are duct pressure
Uncompacted situation is starched, influences the quality of beam.
The content of the invention
For existing prestressing force prefabricated small box girder construction technology, it is an object of the invention in order to avoid prior art tensioning
The adverse effect that method is brought, in comprehensive pre-tensioning system and post stretching, externally cable and internal beam, has and cohesive is mixed with prestressing without bondn
Solidifying soil each on the basis of advantage, proposes a kind of new prestressing stretching technique --- transverse tensioning method pre-stress construction.
Another object of the present invention is to provide a kind of transverse tensioning method prestressing force small box girder simple in structure, construction safety to apply
Work production method.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of prestressing force small box girder production method, it is characterised in that：The prestressing force small box girder is divided into the flume section of centre
With the anchoring section positioned at flume section both ends, whole prestressing force small box girder pours completion in three times, specific as follows：
Step 1: pouring flume section first, remain for arrangement prestress in advance on the prestressing force small box girder web of flume section
The flume of muscle, and preset two tensioning holes for being used for tensioned prestressing bar in flume bottom interval a distance；
Step 2: by presstressed reinforcing steel lashing in the flume that flume section is reserved, by the presstressed reinforcing steel after lashing and both ends
The steel reinforcement cage of anchoring section is fixedly linked, and pours the anchoring section positioned at both ends, and completion pours for the second time；
Step 3: after pouring curing for the second time, by two horizontal Zhang Kongyong tensioning equipments of flume bottom by presstressed reinforcing steel
Down tensioning, the tensioning value and stretch value that inspection presstressed reinforcing steel reaches are met the requirements；
Step 4: being poured to the flume in flume section, complete third time and pour, tensioning equipment is removed after curing, it is complete
Into the making of whole prestressing force small box girder.
As an improvement, the flume section casting craft is：The bottom plate and web reinforcement of flume section are first bound, steel reinforcement cage is hung
Enter in exterior sheathing, and load the air bag of reserved flume, after airbag aeration reaches requirement air pressure, inner template is installed, binds top plate steel
Muscle, while poured and installed with the third time that pipeline sets reserved hole to be used for flume every a distance at roof steel bar
Tensioning equipment, reserves two tensioning holes for being used for presstressed reinforcing steel transverse stretching at the bottom plate of flume, checks that steel bar template is errorless
Afterwards, first time concrete is poured, flume section is completed and pours.
As an improvement, in step 2, the positioning steel for positioning presstressed reinforcing steel is being set with the anchoring section of flume section joint
Plate, specifically, according to the design requirement of presstressed reinforcing steel, sets multiple corresponding location holes, every prestressing force on fixing steel plate
Muscle is passed through from one of location hole, and the steel reinforcement cage of fixing steel plate and anchoring section welds together.
As an improvement, in step 2, presstressed reinforcing steel is caught on from spacer bar under back in anchoring section, makes in advance should in anchoring section
Power muscle keeps straightened condition, and pours, complete the presstressed reinforcing steel binding in the steel reinforcement cage of anchoring section to anchoring section afterwards
It is secondary to pour.
As an improvement, stiffener net is respectively equipped with the bottom plate and web of tensioning hole surrounding in the flume section.
As an improvement, during binding flume section steel reinforcement cage, the hole spacing reserved in flume section roof steel bar with pipeline is
1.5-3m, the hole that two of which is reserved are corresponding with two tensioning holes on bottom plate.
As an improvement, before anchoring section pours, after presstressed reinforcing steel lashing, positioned in flume every a distance with interim
Reinforced bar support presstressed reinforcing steel, anchoring section remove interim spacer bar after pouring curing.
As an improvement, after to presstressed reinforcing steel transverse stretching, presstressed reinforcing steel is divided into tilting section and flat segments in flume, wherein
The Bottom Runby of presstressed reinforcing steel transverse stretching is 1 with the ratio range for tilting segment length:4.5~1:6.
As an improvement, the concrete that third time pours flume is than preceding two-step pouring flume section and anchoring section concrete strength
The microdilatancy pea gravel concreten of a high grade.
As an improvement, the tensioning equipment includes tension rod, bearing plate, anchorage and jack, first by the top of tension rod with
Bearing plate is fixedly linked, and then by tension rod from flume top toward decentralization, tension rod at least two, and is symmetrically distributed in prestressing force
Muscle both sides, tension rod lower end are stretched out from the tensioning hole of flume bottom, place steel plate washer between bearing plate and presstressed reinforcing steel afterwards,
Tension rod bottom is installed with jack, wedge-shaped bearing plate, wedge-shaped bearing plate are set between jack and flume section bottom plate
Upper surface is parallel with flume section bottom plate, and lower surface is vertical with tension rod, finally starts jack pair presstressed reinforcing steel and laterally open
Draw, after reaching requirement to tension of prestressed tendon, pour flume, flume removes jack and wedge-shaped bearing plate after pouring curing, will
The tension rod stretched out outside bottom plate is cut off, and closes tensioning hole.
The beneficial effects of the invention are as follows：
(1) greatest drawback of post-tensioned construction is that leakiness phenomenon easily occurs in pipeline pneumatic mortar, so as to influence the quality of beam.
Therefore it is reserved flume casting concrete that transverse tensioning method, which changes pipeline pneumatic mortar, so that the quality of beam is controlled better.
(2) post stretching is used, is asked when presstressed reinforcing steel is longer there are stretching force is uneven, middle part presstressed reinforcing steel utilization rate is low
Topic, and transverse tensioning method tensioning is used, presstressed reinforcing steel still has preferable stretch-draw effect in the middle part of girder span, the experiment proved that, presstressed reinforcing steel
Utilization rate can be up to 80%~90%.
(3) post stretching needs anchorage that presstressed reinforcing steel is fixed, and transverse tensioning method has used for reference the bonding of pre-tensioning system from anchor, saves
Anchorage is saved；, can be with the very heavy of selection of small tonnage meanwhile the stretching force needed for transverse tensioning method is much smaller than the stretching force of post stretching
Top；For transverse tensioning method from box beam tension in lower part, both ends prestressing tendon need not stretch out beam body to obtain tension operation space, save certain
The presstressed reinforcing steel of quantity.
(3) present invention solves the problems, such as that mud jacking is uncompacted in existing small box girder prestressed stretch-draw, while reduces pre- answer
The stress loss of power muscle, the utilization rate for improving presstressed reinforcing steel, significantly reduce stretching force.The configuration of the present invention is simple, construction
Safety, is mainly used for carrying out the prestressing force small box girder construction of prestressed stretch-draw at beam bottom.
Brief description of the drawings
Fig. 1 is prestressing force small box girder top view.
Fig. 2 is prestressing force small box girder sectional view in Fig. 1；
Wherein A-A is anchoring section sectional view in Fig. 1, and B-B is flume section sectional view in Fig. 1.
Fig. 3 is prestressing force small box girder presstressed reinforcing steel lashing and tensioning schematic diagram.
Fig. 4 is prestressing force small box girder flume section stiffener net distribution schematic diagram.
Fig. 5 is that tensioning equipment uses schematic diagram.
Fig. 6 is that left half section upper preformed hole of the small case of prestressing force sets top view illustration.
Fig. 7 is that left half section upper tensioning hole of the small case of prestressing force sets bottom view schematic diagram.
1- flume sections, 2- anchoring sections, 3- presstressed reinforcing steels, 4- flume section top plates, 5- flume section webs, 6- flume section bottom plates,
7- anchoring section top plates, 8- anchoring section bottom plates, 9- anchoring section webs, 10- fixing steel plates, 11- web stiffener nets, 12- bottom plates
Stiffener net, 13- flumes, 14- tensioning hole, 15- holes, 16-P anchor extruded sleeves, 17- bearing plates, 18- steel plate washers, 19- tensioning
Bar, 20- wedge shape bearing plates, 21- anchorages, 22- jack, 23- anchoring section stiffeners.
Embodiment
Below by non-limiting embodiment, the invention will be further described：
A kind of prestressing force small box girder production method, as shown in Figure 1, the prestressing force small box girder to be divided into the flume section 1 of centre
With the anchoring section 2 positioned at 1 both ends of flume section, whole prestressing force small box girder pours completion in three times, specific as follows：
Step 1: pouring flume section 1 first, remain for arrangement in advance on the prestressing force small box girder web of flume section 1 and in advance should
The flume 13 of power muscle 3, and preset two tensioning holes 14 for being used for tensioned prestressing bar 3 in 13 bottom interval a distance of flume；
Step 2: by presstressed reinforcing steel 3 flume section 1 reserve flume 13 in lashing, by the presstressed reinforcing steel 3 and two after lashing
The steel reinforcement cage of the anchoring section 2 at end is fixedly linked, and pours the anchoring section 2 positioned at both ends, and completion pours for the second time；
Step 3: after pouring curing for the second time, by two horizontal Zhang Kongyong tensioning equipments of 13 bottom of flume by prestressing force
The down tensioning of muscle 3, the tensioning value and stretch value that inspection presstressed reinforcing steel 3 reaches are met the requirements；
Step 4: being poured to the flume 13 in flume section 1, complete third time and pour, tensioning equipment is removed after curing,
Complete the making of whole prestressing force small box girder.
1 casting craft of flume section is：The bottom plate and web reinforcement of flume section 1 are first bound, steel reinforcement cage is hung in into external mold
In plate, and load the air bag of reserved flume 13, after airbag aeration reaches requirement air pressure, inner template is installed, binds roof steel bar, together
When at roof steel bar every one section of 2m distance with PVC pipeline set reserved hole 15 be used for flume 13 third time pour and
Tensioning equipment is installed, two tensioning holes 14 for being used for 3 transverse stretching of presstressed reinforcing steel are reserved at the bottom plate of flume 13, check reinforcing bar
After template is errorless, first time concrete is poured, flume section 1 is completed and pours, after pouring, air bag deflation is taken out and forms flume
13。
In step 2, the fixing steel plate 10 that presstressed reinforcing steel 3 is positioned is set in the anchoring section 2 with 1 joint of flume section, is had
Body is, according to the design requirement of presstressed reinforcing steel 3, multiple corresponding location holes, every presstressed reinforcing steel 3 to be set on fixing steel plate 10
Passed through from one of location hole, to ensure 3 accurate positioning of presstressed reinforcing steel, the web reinforcement of fixing steel plate 10 and anchoring section 2
Cage welds together or is held together, and 10 thickness of fixing steel plate is 30mm or so, and the pitch requirements of adjacent presstressed reinforcing steel 3 meet rule
Model requirement.
In step 2, presstressed reinforcing steel 3 is caught on from spacer bar under back in anchoring section 2, makes presstressed reinforcing steel 3 in anchoring section 2
Straightened condition is kept, and presstressed reinforcing steel 3 is bound into the steel reinforcement cage in anchoring section 2, anchoring section 2 is poured afterwards, completes the
It is secondary to pour.
Bottom plate stiffener net 12 and web are respectively equipped with the flume section 1 on the bottom plate and web of 14 surrounding of tensioning hole
Stiffener net 11, bottom plate and web concrete surface occur without crack during ensureing 3 transverse stretching of presstressed reinforcing steel.
When binding flume 1 steel reinforcement cage of section, 15 spacing of hole reserved on 4 reinforcing bar of flume section top plate with pipeline is 1.5-
3m, the present embodiment 2m, the hole 15 that two of which is reserved are corresponding with two tensioning holes 14 on bottom plate.
Before anchoring section 2 pours, after 3 lashing of presstressed reinforcing steel, every the interim spacer bar branch of 4m distances in flume 13
Presstressed reinforcing steel 3 is supportted, meets the required linear position of design to ensure presstressed reinforcing steel 3 before tensioning, after anchoring section 2 pours curing
Interim spacer bar is removed, 3 both ends of presstressed reinforcing steel are tied up on 9 steel reinforcement cage of anchoring section web.
After 3 transverse stretching of presstressed reinforcing steel, presstressed reinforcing steel 3 is divided into tilting section and flat segments in flume 13, wherein in advance should
The Bottom Runby of 3 transverse stretching of power muscle is 1 with the ratio range for tilting segment length:4.5~1:6.
The concrete that third time pours flume 13 is higher by one than preceding two-step pouring flume section 1 and 2 concrete strength of anchoring section
The microdilatancy pea gravel concreten of a grade.
The tensioning equipment that above-mentioned transverse tensioning method prestressing force small box girder production method uses includes tension rod 19, bearing plate 17, anchor
The top of tension rod 19, is first fixedly linked, then by tension rod by tool 21 and jack 22 with bearing plate 17 by P anchors extruded sleeve 16
19 from the top of flume 13 toward decentralization, tension rod 19 at least two, and is symmetrically distributed in 3 both sides of presstressed reinforcing steel, 19 lower end of tension rod
Stretched out from the tensioning hole 14 of 13 bottom of flume, steel plate washer 18 is placed between bearing plate 17 and presstressed reinforcing steel 3 afterwards, by tension rod
19 bottoms are installed with jack 22, and wedge-shaped bearing plate 20, wedge-shaped bearing plate are set between jack 22 and flume section bottom plate 6
20 upper surfaces are parallel with flume section bottom plate 6, and lower surface is vertical with tension rod 19, finally start jack 22 to presstressed reinforcing steel 3 into
Row transverse stretching, after reaching requirement to 3 tensioning of presstressed reinforcing steel, pours flume 13, flume 13 removes jack 22 after pouring curing
With wedge-shaped bearing plate 20, the tension rod 19 stretched out outside flume section bottom plate 6 is cut off, and close tensioning hole 14.
2 length of anchoring section to meet presstressed reinforcing steel 3 cohere anchoring needed for minimum length requirement, specific size according to
Beam body construction determines that 1 length of flume section subtracts the residue length after beam both ends anchoring section 2 for beam length.Before and after box girder construction is completed
Real-time monitoring is carried out to construction quality.The other parts of the present embodiment use the prior art.
Claims (10)
- A kind of 1. prestressing force small box girder production method, it is characterised in that：By the prestressing force small box girder be divided into centre flume section and Anchoring section positioned at flume section both ends, whole prestressing force small box girder pours completion in three times, specific as follows：Step 1: pouring flume section first, remain for arrangement prestress muscle in advance on the prestressing force small box girder web of flume section Flume, and preset two tensioning holes for being used for tensioned prestressing bar in flume bottom interval a distance；Step 2: by presstressed reinforcing steel lashing in the flume that flume section is reserved, by the presstressed reinforcing steel after lashing and the anchoring at both ends The steel reinforcement cage of section is fixedly linked, and pours the anchoring section positioned at both ends, and completion pours for the second time；Step 3: after pouring curing for the second time, by two horizontal Zhang Kongyong tensioning equipments of flume bottom by presstressed reinforcing steel down Tensioning, the tensioning value and stretch value that inspection presstressed reinforcing steel reaches are met the requirements；Step 4: being poured to the flume in flume section, complete third time and pour, tensioning equipment is removed after curing, complete whole The making of a prestressing force small box girder.
- A kind of 2. prestressing force small box girder production method as claimed in claim 1, it is characterised in that：The flume section casting craft For：The bottom plate and web reinforcement of flume section are first bound, steel reinforcement cage is hung in exterior sheathing, and loads the air bag of reserved flume, gas After capsule inflation reaches requirement air pressure, inner template is installed, binds roof steel bar, while managed at roof steel bar every a distance The third time that road sets reserved hole to be used for flume pours and installs tensioning equipment, and two are reserved at the bottom plate of flume and is used for The tensioning hole of presstressed reinforcing steel transverse stretching, after checking that steel bar template is errorless, pours first time concrete, completes flume section and pours.
- A kind of 3. prestressing force small box girder production method as claimed in claim 2, it is characterised in that：In step 2, with flume The anchoring section of section joint sets the fixing steel plate for positioning presstressed reinforcing steel, specifically, according to the design requirement of presstressed reinforcing steel, Multiple corresponding location holes are set on fixing steel plate, every presstressed reinforcing steel is passed through from one of location hole, fixing steel plate with The steel reinforcement cage of anchoring section welds together.
- A kind of 4. prestressing force small box girder production method as claimed in claim 3, it is characterised in that：In step 2, in anchoring section Spacer bar catches on presstressed reinforcing steel under back, presstressed reinforcing steel in anchoring section is kept straightened condition, and presstressed reinforcing steel is bound In the steel reinforcement cage of anchoring section, anchoring section is poured afterwards, completion pours for the second time.
- A kind of 5. prestressing force small box girder production method as claimed in claim 4, it is characterised in that：Tensioning hole in the flume section Stiffener net is respectively equipped with the bottom plate and web of surrounding.
- A kind of 6. prestressing force small box girder production method as claimed in claim 2, it is characterised in that：Bind flume section steel reinforcement cage When, the hole spacing reserved in flume section roof steel bar with pipeline is 1.5-3m, on the hole and bottom plate that two of which is reserved Two tensioning holes correspond to.
- A kind of 7. prestressing force small box girder production method as claimed in claim 2, it is characterised in that：Before anchoring section pours, in advance After stress rib lashing, every a distance with interim positioning steel-bar supporting presstressed reinforcing steel in flume, after anchoring section pours curing Remove interim spacer bar.
- A kind of 8. prestressing force small box girder production method as claimed in claim 2, it is characterised in that：To presstressed reinforcing steel transverse stretching Afterwards, presstressed reinforcing steel is divided into the Bottom Runby and tilting section of tilting section and flat segments, wherein presstressed reinforcing steel transverse stretching in flume The ratio range of length is 1:4.5~1:6.
- A kind of 9. prestressing force small box girder production method as claimed in claim 1, it is characterised in that：Third time pours the mixed of flume Solidifying soil is the microdilatancy pea gravel concreten of a grade higher than preceding two-step pouring flume section and anchoring section concrete strength.
- A kind of 10. prestressing force small box girder production method as described in claim 1 to 9 any one, it is characterised in that：Described Draw equipment to include tension rod, bearing plate, anchorage and jack, will first be fixedly linked with bearing plate at the top of tension rod, then will open Pull rod toward decentralization, tension rod at least two, and is symmetrically distributed in presstressed reinforcing steel both sides at the top of the flume, and tension rod lower end is from flume The tensioning hole of bottom is stretched out, and places steel plate washer between bearing plate and presstressed reinforcing steel afterwards, and tension rod bottom and jack are pacified Installing, wedge-shaped bearing plate is set between jack and flume section bottom plate, wedge-shaped bearing plate upper surface is parallel with flume section bottom plate, Lower surface is vertical with tension rod, finally starts jack pair presstressed reinforcing steel and carries out transverse stretching, and tension of prestressed tendon is reached will After asking, flume is poured, flume removes jack and wedge-shaped bearing plate after pouring curing, the tension rod stretched out outside bottom plate is cut off, And close tensioning hole.
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| CN201711175269.3A CN107984610B (en) | 2017-11-22 | 2017-11-22 | A kind of prestressing force small box girder production method |
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| CN201711175269.3A CN107984610B (en) | 2017-11-22 | 2017-11-22 | A kind of prestressing force small box girder production method |
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| CN107984610B CN107984610B (en) | 2019-10-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592839A (en) * | 2017-03-03 | 2017-04-26 | 沈阳建筑大学 | Horizontal tensioning and external pre-stressing profiled steel sheet composite floor |
| CN109695322A (en) * | 2019-02-01 | 2019-04-30 | 蔡君 | Prestressed prefabricated stringer type stairway of one kind and preparation method thereof |
| CN111622079A (en) * | 2020-05-26 | 2020-09-04 | 中交路桥建设有限公司 | Separated construction method for prestressed cast-in-situ box beam end and beam |
| CN112695633A (en) * | 2020-12-17 | 2021-04-23 | 中国能源建设集团安徽电力建设第一工程有限公司 | Prefabricated small box girder prestress engineering construction method for intelligent express way |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592839A (en) * | 2017-03-03 | 2017-04-26 | 沈阳建筑大学 | Horizontal tensioning and external pre-stressing profiled steel sheet composite floor |
| CN109695322A (en) * | 2019-02-01 | 2019-04-30 | 蔡君 | Prestressed prefabricated stringer type stairway of one kind and preparation method thereof |
| CN111622079A (en) * | 2020-05-26 | 2020-09-04 | 中交路桥建设有限公司 | Separated construction method for prestressed cast-in-situ box beam end and beam |
| CN112695633A (en) * | 2020-12-17 | 2021-04-23 | 中国能源建设集团安徽电力建设第一工程有限公司 | Prefabricated small box girder prestress engineering construction method for intelligent express way |
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| Publication number | Publication date |
|---|---|
| CN107984610B (en) | 2019-10-25 |
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