CN108086354A - Prefabricated assembled comprehensive pipe gallery spliced by cast-in-place hidden beams and construction method thereof - Google Patents
Prefabricated assembled comprehensive pipe gallery spliced by cast-in-place hidden beams and construction method thereof Download PDFInfo
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- CN108086354A CN108086354A CN201711270238.6A CN201711270238A CN108086354A CN 108086354 A CN108086354 A CN 108086354A CN 201711270238 A CN201711270238 A CN 201711270238A CN 108086354 A CN108086354 A CN 108086354A
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 241001669679 Eleotris Species 0.000 claims description 25
- 238000012423 maintenance Methods 0.000 claims description 12
- 230000002787 reinforcement Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000011505 plaster Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 241000221931 Hypomyces rosellus Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
A prefabricated assembled comprehensive pipe gallery spliced by cast-in-place hidden beams and a construction method thereof, wherein the comprehensive pipe gallery comprises a plurality of sections of comprehensive pipe gallery bodies, each section of the comprehensive pipe gallery body is divided into a plurality of sections of prefabricated pipe galleries along the extending direction of a groove, the plurality of sections of prefabricated pipe galleries are spliced to form the comprehensive pipe gallery body, U-shaped inserting ribs are reserved on the two sides of a top plate and a bottom plate of the connecting end of each section of the prefabricated pipe gallery in the transverse direction, adjacent prefabricated pipe galleries are connected in an overlapping mode through the U-shaped inserting ribs in a staggered and overlapping mode, concrete is poured at the overlapping position of the adjacent prefabricated pipe galleries to form the cast-in-place hidden beams, and the cast-in-place hidden beams connect the adjacent prefabricated pipe galleries. Can solve the prefabricated assembly difficult problem of many cabins pipe gallery and the nonstandard section of pipe gallery.
Description
Technical field
The present invention relates to a kind of prefabricated assembled pipe gallery spliced with cast-in-place hidden girder and its construction methods.
Background technology
Urban Underground pipe gallery is that the underground of a variety of pipelines such as concentrated setting electric power, communication, combustion gas, feedwater, draining is empty
Between structure.It solves traffic congestion caused by due to " slide fastener road ", avoids aerial " cobweb ", to promoting the total bodily form in city
As creating city harmony ecological environment and playing the role of actively promoting, cause the highest attention of the whole nation from the leadership to the masses.
Traditional complete cast-in-place piping lane form of construction work is tied up, it is necessary to carry out steel bar meter to piping lane overall structure at the construction field (site)
The processes such as bundle, formwork, concreting, maintenance and form removal, not only working procedure is complicated, long construction period, and template loss is big, also
The problems such as in the presence of larger raw material storage and processing site is needed, very big fiber crops are brought to construction environment narrow and small in city
It is tired.
, there is integrated precast Pipe rack and prefabricated in the defects of in order to solve complete cast-in-place piping lane form of construction work
Pipe rack.Integrated precast piping lane has many advantages, such as good integrity, and installation procedure is simple, but there are single-unit size is big, weight
Greatly, transporting and hoisting is not easy, the problems such as the waterproof non insurance of joint.And existing assembled Pipe rack is mostly due to assembling members
More, globality poor is susceptible to the defects of junction structural failure, sealing material damage or aging cause infiltration in piping lane.
The content of the invention
The present invention proposes that a kind of transporting and hoisting is easy, piece is few, the use of good integrity is cast-in-place in view of the deficiencies of the prior art
The prefabricated assembled pipe gallery and its construction method of concealed beam splicing.
The purpose of the present invention is achieved by using following technical proposals：
A kind of prefabricated assembled pipe gallery spliced with cast-in-place hidden girder including more piece pipe gallery body, often saves synthesis
Piping lane body is divided into the prefabricated piping lane of multistage along groove extending direction, and the prefabricated piping lane of multistage is assembled to form pipe gallery body, often
The top plate of the prefabricated piping lane connecting pin of section and bottom plate both sides are laterally reserved with U-shaped joint bar, and contiguous prefabricated piping lane is handed over by U-shaped joint bar
Mistake overlap joint connection, lap-joint's casting concrete of the adjacent prefabricated piping lane form cast-in-place hidden girder, and the cast-in-place hidden girder will be adjacent
The prefabricated piping lane connection.
Casting concrete forms cast-in-place sleeper at the longitudinal lap joint of adjacent pipe gallery body.
The additional bar extended along concealed beam direction is equipped in the cast-in-place hidden girder, the additional bar is connected with U-shaped joint bar.
Vertical reinforcement and closed stirrups are equipped in the cast-in-place sleeper, in the closed stirrups and adjacent pipe gallery body
Horizontal reinforcement connection, the both ends of the vertical reinforcement are connected by screw with adjacent pipe gallery body.
The U-shaped joint bar lap width is 200mm.
A kind of construction method of the prefabricated assembled pipe gallery spliced with cast-in-place hidden girder, for assembling the integrated pipe
Corridor includes the following steps：Support system construction → channel excavation → concrete cushion pours → bottom base plate waterproof and protective layer
The prefabricated piping lane lifting of construction → multistage → U-shaped joint bar of concealed beam interlocks overlap joint → concealed beam model sheetinstallat → steel pipe buried in advance → more piece synthesis
The U-shaped joint bar of internode sleeper of piping lane body interlock overlap joint → sleeper model sheetinstallat → concealed beam and sleeper concreting → form removal,
Maintenance → side wall, the outer waterproof of top plate and protective layer construction → trench backfill.
The height of the pipe gallery body is no more than 4 meters, and width is no more than 2.5 meters.
The internode vertical direction of the pipe gallery body sets cast-in-place sleeper connection, the deformation of the pipe gallery body
Rubber watertight strip and transmission rod are set at seam；The tube coupling of the pipe gallery body carries out cast in situs by supporting module
It connects, embedded sleeve barrel and sealing up screw is provided at the tube coupling of the pipe gallery body.
The production procedure of the prefabricated piping lane is as follows：
(1), the residue and dust in die station are cleared up；
(2), releasing agent spraying is implemented to die station whole plane；
(3), installation form, within the walls reinforcing bar and set aside pre-embedded part；
(4), single side concreting is carried out in a mold, and vibration compacting forms the prefabricated piping lane of multistage；
(5), into fog room, the initial set of concrete members is completed；
(6), plaster, component surface is carried out to frustrate concora crush light；
(7), it is steam-cured to component progress into maintenance cabin, reach the intensity requirement of demoulding lifting；
(8), maintenance is completed, and is demoulded, form removal；
(9), turnover panel, which is stood, is hoisted to rinsing area；
(10), surrounding section cleans, and reaches undisguised material effect；
(11), impermeable structure is tested.
Using above-mentioned technical proposal, pipe gallery is assembled by the prefabricated piping lane of multistage, every section of prefabricated piping lane connecting pin
Top plate and bottom plate both sides are laterally reserved with U-shaped joint bar, and contiguous prefabricated piping lane staggeredly overlaps connection, Ran Hou by U-shaped joint bar
Lap-joint's poured in place concrete is so as to form cast-in-place hidden girder, so as to which the prefabricated piping lane of multistage be connected.Present invention synthesis is examined
Consider the factors such as road conditions, vehicle transport restrictive condition, piping lane cross dimensions, duration, hanging device and place and carry out side wall pipe
Section divides, and is attached between the segment of each pipe gallery body by cast-in-place sleeper.Prefabricated components of the present invention make, line setting
Afterwards, base plate steel bar binding is carried out, pours bottom plate, then prefabricated components are assembled in the maintenance demoulding, installation stitching portion reinforcing bar, template are poured
Cast-in-place part concrete is built, forms fabricated assembly overall concrete pipe gallery.
It in conclusion prefabricated piping lane is split as different shape in the present invention, is then connected, combined by cast-in-place hidden girder
The advantages of prefabricated and cast in place process, can reduce the dead weight of prefabricated components, is conducive to construction hoisting, and energy by rationally splitting
By cast-in-place hidden girder each component is made to be linked to be entirety, on the premise of the total bearing capacity of pipe gallery and deformability is not reduced,
The prefabrication and assembly construction problem of more cabin piping lanes and piping lane non-standard segment can be solved, is that a kind of transporting and hoisting is easy, piece is few, globality
The half prefabricated assembled pipe gallery and its construction method of good cast-in-place hidden girder splicing.
Description of the drawings
Fig. 1 is the cross-section diagram of the present invention.
Fig. 2 is the sectional schematic diagram of the prefabricated piping lane of " C " font of the invention.
Fig. 3 is the sectional schematic diagram of the prefabricated piping lane of " work " font of the invention.
Fig. 4 is the sectional schematic diagram of the prefabricated piping lane of inverted " C " font of the present invention.
Fig. 5 is prefabrication cast-in-place concealed beam connecting structure schematic diagram of the present invention.
Fig. 6 is the precast spliced sleeper internode connecting structure schematic diagram of the present invention.
In attached drawing：The prefabricated piping lane of 1-" C " font, the prefabricated piping lane of 2-" work " fonts, the prefabricated piping lane of 3-inverted " C " font,
4-cast-in-place hidden girder, 5-U-shaped joint bar, 6-concealed beam template, 7-screw, 8-additional bar, 9-closed stirrups, 10-sleeper mould
Plate.
Specific embodiment
Below in conjunction with the accompanying drawings and specific example, it is described in detail a kind of prefabricated assembled integrated pipe spliced with cast-in-place hidden girder
The specific embodiment of corridor and its construction method.
As shown in Figures 1 to 6, a kind of prefabricated assembled pipe gallery spliced with cast-in-place hidden girder, including more piece integrated pipe
Corridor body, often section pipe gallery body is assembled along groove extending direction by three sections of prefabricated piping lanes, the horizontal stroke of three sections of prefabricated piping lanes
Section is followed successively by the prefabricated piping lane 1 of " C " font, the prefabricated piping lane 2 of " work " font and the prefabricated piping lane 3 of inverted " C " font, every section of prefabricated piping lane
The top plate of connecting pin and bottom plate both sides are laterally reserved with U-shaped joint bar 5, and by U-shaped joint bar 5, staggeredly overlap joint connects contiguous prefabricated piping lane
It connects, the horizontal direction lap-joint casting concrete of the adjacent prefabricated piping lane forms cast-in-place hidden girder 4, the adjacent pipe gallery sheet
The vertical direction lap-joint casting concrete of body forms cast-in-place sleeper, and the cast-in-place hidden girder connects the prefabricated piping lane, described
Cast-in-place sleeper connects adjacent pipe gallery body.Described 5 width degree about 200mm or so of U-shaped joint bar, lap position is in roof and floor
Near the 1/3 of span, additional bar 8 is arranged, then concealed beam template 6, casting concrete formation cast-in-place hidden girder, i.e. cast-in-place hidden girder
Reinforcing bar overlaps U-shaped joint bar 5 by additional longitudinal reinforcement 8 and left and right sides and forms；Additional bar 8 is equipped in the cast-in-place hidden girder 3, it is described
Additional bar 8 is connected with U-shaped joint bar 5.In the cast-in-place sleeper be equipped with vertical reinforcement and closed stirrups 9, the closed stirrups 9 with
The horizontal reinforcement connection of adjacent pipe gallery body, the both ends of the vertical reinforcement pass through screw 7 and adjacent pipe gallery body
Connection.
A kind of construction method of the prefabricated assembled pipe gallery spliced with cast-in-place hidden girder, for assembling above-mentioned integrated pipe
Corridor includes the following steps：For assembling above-mentioned pipe gallery, include the following steps：Support system construction → channel excavation → mixed
Solidifying soil padding pours → and bottom base plate waterproof and the prefabricated piping lane lifting of protective layer construction → multistage → U-shaped joint bar of concealed beam staggeredly overlap
→ concealed beam template 6 installs → and steel pipe buried in advance → U-shaped joint bar of pipe gallery body internode sleeper overlap joint → sleeper template 10 of interlocking pacifies
Dress → concealed beam and sleeper concreting → form removal, maintenance → side wall, the outer waterproof of top plate and protective layer construction → trench backfill.
The height of the prefabricated piping lane is no more than 4 meters, and width is no more than 2.5 meters.
Longitudinally disposed cast-in-place sleeper connection, the deformation joint of the pipe gallery body between the tube coupling of the pipe gallery body
Place sets rubber watertight strip and transmission rod；The tube coupling of the pipe gallery body carries out cast in situs company by supporting module
It connects, embedded sleeve barrel and sealing up screw is provided at the tube coupling of the pipe gallery body.
Specific design considerations of the invention is as follows：
1st, prefabricated tube coupling length division
According to road traffic regulations of rules, vehicle goods total height is more than 4 meters or when overall width is more than 2.5 meters, that is, belongs to the fortune that transfinites
It is defeated.Taking into full account the factors such as road conditions, vehicle transport restrictive condition, piping lane cross dimensions, duration, hanging device and place
Under conditions of, classifying rationally standard segmental length；
2nd, design of lifting points
In order to avoid prefabricated components are damaged during transport is assembled, according to the side wall, mid-board and top plate
Weight and size, while consider lifting requirements, Reasonable Arrangement suspension centre, and to strengthening at suspension centre；
3rd, tube coupling connects
Longitudinally disposed cast-in-place sleeper connection, deformation joint set rubber watertight strip and transmission rod between tube coupling.Tube coupling connects
Sleeper template 10 is connect, carries out cast in situs.
The production procedure of piping lane prefabricated eventually of the invention is as follows：
1st, the residue and dust in die station are cleared up；
2nd, releasing agent spraying is implemented to die station whole plane；
3rd, installation form, within the walls reinforcing bar and set aside pre-embedded part；
4th, single side concreting is carried out in a mold, and it is pre- to form the prefabricated piping lane 1 of " C " font, " work " font for vibration compacting
Tubulation corridor 2 and the prefabricated piping lane 3 of inverted " C " font；
5th, into fog room, the initial set of concrete members is completed；
6th, plaster, component surface is carried out to frustrate concora crush light；
7th, it is steam-cured to component progress into maintenance cabin, reach the intensity requirement of demoulding lifting；
8th, maintenance is completed, and is demoulded, form removal；
9th, turnover panel, which is stood, is hoisted to rinsing area；
10th, surrounding section cleans, and reaches undisguised material effect；
11st, impermeable structure is tested.
Present apparatus assembled in situ flow is as follows：
1st, support system is constructed；
2nd, channel excavation；
3rd, concrete cushion pours；
4th, bottom plate bottom waterproof and protective layer construction；
5th, the prefabricated piping lane 1 of " C " font, the prefabricated piping lane 2 of " work " font and the prefabricated piping lane 3 of inverted " C " font lift；
6th, cast-in-place hidden girder reinforcement installation, model sheetinstallat；
7th, steel pipe buried in advance；
8th, internode sleeper reinforcement installation, model sheetinstallat；
9th, cast-in-place hidden girder and internode sleeper concreting；
10th, form removal, maintenance；
11st, the outer waterproof of side wall, top plate and protective layer construction；
12nd, trench backfill.
It is above-mentioned for the preferred embodiment of the present invention, but those skilled in the art should be understood that do not depart from it is appended
In the spirit and scope of the present invention that claims are limited, in form and details to the various changes made by the present invention
Change, belong to protection scope of the present invention.
Claims (9)
1. a kind of prefabricated assembled pipe gallery spliced with cast-in-place hidden girder, including more piece pipe gallery body, it is characterised in that：
It often saves pipe gallery body and is divided into the prefabricated piping lane of multistage along groove extending direction, the prefabricated piping lane of multistage is assembled to form pipe gallery
Body, the top plate of every section of prefabricated piping lane connecting pin and bottom plate both sides are laterally reserved with U-shaped joint bar, and contiguous prefabricated piping lane passes through U
Type joint bar staggeredly overlaps connection, and lap-joint's casting concrete of the adjacent prefabricated piping lane forms cast-in-place hidden girder, described cast-in-place dark
Beam connects the adjacent prefabricated piping lane.
2. the prefabricated assembled pipe gallery according to claim 1 spliced with cast-in-place hidden girder, it is characterised in that：It is adjacent comprehensive
It closes casting concrete at the longitudinal lap joint of piping lane body and forms cast-in-place sleeper.
3. the prefabricated assembled pipe gallery according to claim 2 spliced with cast-in-place hidden girder, it is characterised in that：It is described existing
The additional bar for being equipped in concealed beam and extending along concealed beam direction is poured, the additional bar is connected with U-shaped joint bar.
4. the prefabricated assembled pipe gallery according to claim 3 spliced with cast-in-place hidden girder, it is characterised in that：It is described existing
It pours and vertical reinforcement and closed stirrups is equipped in sleeper, the closed stirrups connect with the intrinsic horizontal reinforcement of adjacent pipe gallery
It connects, the both ends of the vertical reinforcement are connected by screw with adjacent pipe gallery body.
5. the prefabricated assembled pipe gallery spliced with cast-in-place hidden girder according to one of Claims 1-4, feature exist
In：The U-shaped joint bar lap width is 200mm.
6. it is a kind of with cast-in-place hidden girder splice prefabricated assembled pipe gallery construction method, for assemble claim 1 to 5 it
Pipe gallery described in one, it is characterised in that：Include the following steps：Support system construction → channel excavation → concrete cushion pours
Build → bottom base plate waterproof and the prefabricated piping lane lifting of protective layer construction → multistage → U-shaped joint bar of concealed beam interlock overlap joint → concealed beam template
The U-shaped joint bar of internode sleeper of installation → steel pipe buried in advance → more piece pipe gallery body interlocks overlap joint → sleeper model sheetinstallat → concealed beam
And sleeper concreting → form removal, maintenance → side wall, the outer waterproof of top plate and protective layer construction → trench backfill.
7. the construction method of the prefabricated assembled pipe gallery according to claim 6 spliced with cast-in-place hidden girder, feature
It is：The height of the pipe gallery body is no more than 4 meters, and width is no more than 2.5 meters.
8. the construction method of the prefabricated assembled pipe gallery according to claim 7 spliced with cast-in-place hidden girder, feature
It is：The internode vertical direction of the pipe gallery body sets cast-in-place sleeper connection, the deformation joint of the pipe gallery body
Place sets rubber watertight strip and transmission rod；The tube coupling of the pipe gallery body carries out cast in situs company by supporting module
It connects, embedded sleeve barrel and sealing up screw is provided at the tube coupling of the pipe gallery body.
9. the construction method of the prefabricated assembled pipe gallery according to claim 6 spliced with cast-in-place hidden girder, feature
It is：The production procedure of the prefabricated piping lane is as follows：
(1), the residue and dust in die station are cleared up；
(2), releasing agent spraying is implemented to die station whole plane；
(3), installation form, within the walls reinforcing bar and set aside pre-embedded part；
(4), single side concreting is carried out in a mold, and vibration compacting forms the prefabricated piping lane of multistage；
(5), into fog room, the initial set of concrete members is completed；
(6), plaster, component surface is carried out to frustrate concora crush light；
(7), it is steam-cured to component progress into maintenance cabin, reach the intensity requirement of demoulding lifting；
(8), maintenance is completed, and is demoulded, form removal；
(9), turnover panel, which is stood, is hoisted to rinsing area；
(10), surrounding section cleans, and reaches undisguised material effect；
(11), impermeable structure is tested.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711270238.6A CN108086354A (en) | 2017-12-05 | 2017-12-05 | Prefabricated assembled comprehensive pipe gallery spliced by cast-in-place hidden beams and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711270238.6A CN108086354A (en) | 2017-12-05 | 2017-12-05 | Prefabricated assembled comprehensive pipe gallery spliced by cast-in-place hidden beams and construction method thereof |
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| CN108086354A true CN108086354A (en) | 2018-05-29 |
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Cited By (7)
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| CN109214105A (en) * | 2018-09-26 | 2019-01-15 | 中建科技有限公司 | The split blade type major diameter reinforcement design method of assembled multi-compartment tube corridor |
| CN109403377A (en) * | 2018-12-10 | 2019-03-01 | 重庆大学 | A kind of assembled pipe gallery based on double-deck corrugated sheet steel-concrete combined board |
| CN109469103A (en) * | 2019-01-16 | 2019-03-15 | 上海中森建筑与工程设计顾问有限公司 | A kind of environment-friendly type fabricated assembly overall pipe gallery and its assembly method |
| CN110284520A (en) * | 2019-06-25 | 2019-09-27 | 北京工业大学 | A large-span closed frame plate-column assembly system with dry-wet mixed connection |
| CN110318427A (en) * | 2019-08-07 | 2019-10-11 | 厦门中平公路勘察设计院有限公司 | A kind of prefabricated pipe gallery construction method of segmentation |
| CN111206620A (en) * | 2020-02-27 | 2020-05-29 | 清华大学 | Prefabricated integrated pipe gallery and its prefabricated plate body connection structure |
| CN115653069A (en) * | 2022-09-26 | 2023-01-31 | 福建鸿生高科环保科技有限公司 | A prefabricated assembled UHPC drainage ditch structure and its construction method |
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Application publication date: 20180529 |