CN106241234B - A kind of self-propelled transport assembly car for prefabricated pipe gallery - Google Patents
A kind of self-propelled transport assembly car for prefabricated pipe gallery Download PDFInfo
- Publication number
- CN106241234B CN106241234B CN201610629970.7A CN201610629970A CN106241234B CN 106241234 B CN106241234 B CN 106241234B CN 201610629970 A CN201610629970 A CN 201610629970A CN 106241234 B CN106241234 B CN 106241234B
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- jack
- self
- pipe gallery
- wheel
- propelled
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G35/00—Mechanical conveyors not otherwise provided for
Abstract
The invention discloses a kind of self-propelleds for prefabricated pipe gallery to transport assembly car, including car body and for the track of car body traveling, the car body includes structural framing, wheel, jack, driving device and synchronously control hydraulic jacking device, the wheel is mounted on structural framing bottom, the surrounding of the structural framing top surface is provided with supporting beam, front and back both sides are respectively arranged with trough girder, wherein both sides are respectively dual-gripper girder construction before and after structural framing, trough girder is arranged between dual-gripper beam, the trough girder is mounted at the top of jack by idler wheel, the jack is mounted on structural framing, the driving device and synchronously control hydraulic jacking device are installed on structural framing, for to wheel, jack and idler wheel provide driving force.Apparatus of the present invention structure is simple, maneuverability mobile member, the features such as occupying little space, and safety and stability and can quickly finish the assembly of prefabricated pipe gallery in the case where being not take up place.
Description
Technical field
The present invention relates to the construction equipments of underground pipe gallery, in particular to a kind of self-propelled for prefabricated pipe gallery
Transport assembly car.
Technical background
Currently, as China's Urbanization Construction is quickly grown, various municipal pipelines because capacity is inadequate, need to largely improve and
Extend various pipelines, it is more that traditional direct-burried pipeline occupies road underground space, also, each pipe installation not in the same period and
Often maintenance, causes road and frequently excavates, and it is current to have severely impacted traffic, and polluted ambient enviroment, has economically produced
Raw huge waste.Now mostly use Urban Underground pipe gallery, it is rationally distributed, effective use urban underground space, reduce friendship
Logical congestion and economic and environment-friendly.Currently, the construction of underground pipe gallery is largely constructed using cast-in-place mode, but this mode need to be
Construction site carries out steel bar meter binding, formwork, concreting, maintenance, demoulding etc..Construction period is long, needs a large amount of former materials
Material heap puts, processes and equipment occupied ground, this adversely affects traffic passage, environmental pollution etc..Therefore, to solve this
Problem is promoting prefabricated piping lane assembling and construction method now.
Prefabricated piping lane construction, transports scene to iant flat truck using after professional factory is prefabricated by pipe gallery fragment,
Underground pipe gallery is completed by design requirement assembly with large-scale crane again.For integrated precast Pipe rack assembling and construction method
Since its every volume is big, weight weight, in order to guarantee that safety mainly needs to provide large size along installation underground pipe gallery position
The beta site of Standing position of a crane carries out lifting work, but the pipe gallery near roads that will be built for old town have building mostly
Therefore object and urban operating mechanism become the obstacle of lifting piping lane construction, piping lane foundation pit, neighboring buildings, facility and friendship to construction
It is logical etc. to cause unsafe hidden danger, or take migration and block the measures such as traffic to meet construction requirement, increase again in this way
A large amount of expenses and time, affect traffic normal pass.Another method is to take in hole to vertically move large size along piping lane
Gantry crane carries out assembly, equally, Yao Zengjia construction area area and more volumes of earthwork, also, by deep basal pit level
The obstruction of support and can not implement.
Summary of the invention
It is simple, easy for construction, at low cost and account for provide a kind of structure aiming at the deficiencies in the prior art by the present invention
Assembly car is transported with the small self-propelled for prefabricated pipe gallery in space.
Designed by the present invention for prefabricated pipe gallery self-propelled transport assembly car, be characterized in that including
Car body and the track travelled for car body, the car body includes structural framing, wheel, jack, driving device and synchronously control liquid
Jacking apparatus is pressed, the wheel is mounted on structural framing bottom, and the surrounding of the structural framing top surface is provided with supporting beam, preceding
Both sides are also respectively provided with trough girder afterwards, wherein front and back both sides are respectively dual-gripper girder construction, trough girder is arranged in dual-gripper beam
Between, the trough girder is mounted at the top of jack by idler wheel, and the jack is mounted on structural framing, in order to rationally sharp
With space, the as far as possible height of reduction self-propelled transport assembly car entirety, reduce occupied space, the driving device and synchronously control
Hydraulic jacking device is installed on structural framing, and the driving device is used to provide driving force to wheel and idler wheel, controls vehicle
Wheel advance or retrogressing, control front and rear rolling wheel synchronize and rotate forward or invert, and the synchronously control hydraulic jacking device is used to control
The integral jacking of jack or decline.
Further, it there are six the jack, is evenly arranged under the trough girder of front and back.It can the steady safe prefabricated piping lane of rest
Tube coupling, and meet the prefabricated piping lane tube coupling that moves up and down.
Further, six jack are 30 tons with model jack, and the oil pump of the jack passes through oil
Pipe is connected in series, then connect with hydraulic jacking device, forms synchronously control hydraulic jacking device, guarantees that six jack stress are equal
Even, symmetrical synchronous rising, to ensure that the mobile accuracy of jacked object.
Still further, idler wheel intermediate under the trough girder is driving roller, remaining is driven roller, the active rolling
Wheel is driven by driving device.Meet prefabricated piping lane tube coupling move in parallel it is more reliable.
Still further, being provided with the wheel rim of protrusion in the middle part of the idler wheel, the trough girder bottom is provided with to be cooperated with wheel rim
Locating slot.Guarantee trough girder will not deviate in moving process and the safety of prefabricated piping lane tube coupling, to ensure that mobile
Precision.
Still further, the trough girder left and right ends are provided with screw rod limiting device, the screw rod limiting device
It is mounted in supporting beam, postive stop baffle is provided in the supporting beam, the postive stop baffle is located at supporting beam rear end, i.e., far from certainly
Line transports one end of assembly car driving direction, and postive stop baffle and screw rod limiting device cooperate for limiting prefabricated piping lane tube coupling
All around move.Guarantee safety when prefabricated piping lane tube coupling assembly and is accurately positioned.
Still further, two of them are distributed in headstock there are six the wheels, four additional is evenly arranged on the tailstock.Rationally
Using tailstock space, meets large scale prefabricated piping lane tube coupling and transport assembled requirement safely by this method.
It preferably, further include remote-control apparatus, the remote-control apparatus is for controlling driving device and synchronously control
Hydraulic jacking device, to control the movement of wheel, jack and idler wheel, the driving device is used and is driven by electricity.So that behaviour
Make more convenient, flexible, safe.
Still further, both sides are respectively dual-gripper girder construction before and after the structural framing, trough girder is arranged in dual-gripper
Between beam.Trough girder is limited by jack stroke and can only be moved in surrounding supporting beam frame, the more steady safety of operation.
The present invention has the advantages that the cooperation of track and car body is arranged in the subterranean excavation that engineering ontology range has been constructed
Mode, so that entire construction does not need to occupy biggish place, it is easy for construction, and safety and stability, it transports quick；It is arranged on car body
There is the structure of jack, idler wheel and trough girder cooperation, front and back, upper and lower, the movement of left and right maneuverability is big so that the present invention has
Type component occupies little space, the feature that structure is simple, while having both transport and assembled dual function；The transport of this self-propelled is spelled
Entrucking is used to suitably load and unload point from some, and by the blocks of design assembly position that transports to of prefabricated piping lane tube coupling, assembly is entire one by one
Piping lane, overall security are high, do not disturb residents, at low cost, high-efficient, save large scale equipment expense and removal expense, using being driven by electricity,
Energy conservation and environmental protection.
Detailed description of the invention
Fig. 1 is that a kind of self-propelled for prefabricated pipe gallery of the present invention transports assembly car structural schematic diagram.
Fig. 2 is that self-propelled of the present invention for prefabricated pipe gallery transports assembly car side structure schematic view.
The right view of Fig. 3 Fig. 2.
Fig. 4 is that idler wheel and trough girder cooperate enlarged structure schematic diagram when jack of the present invention is in off working state.
Fig. 5 is that idler wheel and trough girder cooperate enlarged structure schematic diagram when jack of the present invention is in running order.
Fig. 6 is the assembled process three dimensional structure diagram of the present invention.
Fig. 7 is working state structure schematic diagram of the present invention.
Fig. 3 is in figure: car body A, prefabricated piping lane tube coupling B, track 1, wheel 2, supporting beam 3, trough girder 4, structural framing 5,
Idler wheel 6, wheel rim 6.1, jack 7, driving device 8, rolling groove 9, postive stop baffle 10, interim jack 11, triangular support bracket 12,
Brake 13, interim steel strand wires 14, buffer 15, raft foundation 16, screw rod limiting device 17, synchronous hydraulic jacking apparatus
18。
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments:
Self-propelled shown in figure for prefabricated pipe gallery transports assembly car, including car body A and for car body traveling
Track 1, the car body A include structural framing 5, wheel 2, jack 7, driving device 8 and synchronously control hydraulic jacking device, vehicle
Wheel 2 is mounted on 5 bottom of structural framing, and the surrounding of 5 top surface of structural framing is provided with supporting beam 3, and front and back both sides are also respectively set
There is trough girder 4, wherein front and back both sides are respectively 3 structure of dual-gripper beam, trough girder 4 is arranged between dual-gripper beam 3, trough girder 4
It is mounted on 7 top of jack by idler wheel 6, jack 7 is mounted on structural framing 5, driving device 8 and synchronously control hydraulic top
It rises device 18 to be installed on structural framing 5, driving device 8, which uses, to be driven by electricity for providing driving to wheel 2 and idler wheel 6
Power, the control wheel 2 of driving device 8, which advances, perhaps retreats the synchronous rotating forward of control front and rear rolling wheel 6 or reversion, so that groove profile
Beam and prefabricated piping lane tube coupling above move left and right；Synchronously control hydraulic jacking device 18 control jack 7 integral jacking or
Person's decline, so that prefabricated piping lane tube coupling B reaches assembled height, wherein driving device 8 and synchronously control hydraulic jacking device 18
It is all made of and is driven by electricity.
The present invention is transported for the self-propelled of prefabricated pipe gallery there are six the jack 7 of assembly car, is evenly arranged on front and back slot
Under type beam 4.Six jack are 30 tons with model jack, and the oil pump of jack is connected in series by oil pipe, then by liquid
Jacking apparatus driving is pressed, to form synchronously control hydraulic jacking device.Guarantee six 7 uniform forces of jack, symmetrically synchronize
Rise, to ensure that the mobile accuracy of jacked object.When jack 7 is in off working state, 4 top surface of trough girder thereon is low
In 3 top surface of supporting beam, when jack 7 is in running order, trough girder 4 is jacked, so that trough girder 4 is lifted, it is more than supporting beam 3
Apical side height make the weight of entire prefabricated piping lane tube coupling B so that prefabricated piping lane tube coupling B in supporting beam 3 be made to be detached from supporting beam 3
Amount is fallen on trough girder 4.And trough girder 4 is limited by 7 stroke of jack and can only be moved in 3 frame of front and back dual-gripper beam, slot
The lower intermediate idler wheel 6 of type beam 4 is driving roller, remaining is driven roller, and driving roller is driven by driving device.6 middle part of idler wheel
It is fabricated to the wheel rim 6.1 of protrusion, 4 bottom of trough girder is provided with the locating slot 9 cooperated with wheel rim 6.1, guarantees that trough girder 4 is being moved through
It will not be deviated in journey, to ensure that mobile precision and safety.4 left and right ends of trough girder are provided with screw rod limit dress
17 are set, screw rod limiting device 17 is mounted in supporting beam 3, and one end setting of the supporting beam 3 far from assembly car direction of travel is limited
Position baffle 10,10 collective effect of screw rod limiting device 17 and postive stop baffle guarantee safety and essence when prefabricated piping lane tube coupling B assembly
Determine position.There are six wheels 2, and two of them are distributed in headstock, and four additional is distributed in the tailstock.For convenience of operation, the present invention is also
Remote-control apparatus is devised, for controlling driving device 8 and synchronously control hydraulic jacking device 18, to control wheel 2, thousand
The movement on jin top 7 and idler wheel 6, driving device 8 and synchronously control hydraulic jacking device 18, which use, to be driven by electricity.The above design is made
Track 1 uses rail, and idler wheel 6 uses steel roller, and wheel 2 uses steel wheel, and trough girder 4 uses groove profile girder steel.
The application of the present invention in practice is as follows:
1, it is every piping lane channel of transport with the foundation pit of underground pipe gallery construction section that will be assembled, is laid with self-propelled transport and spells
Entrucking track, the track centerline being laid in channel will with will it is assembled after piping lane central axes be overlapped, the ground under track is wanted
There is certain earth bearing strength, according to the settable raft foundation of specific geological condition, is excavating some in latter section of piping lane foundation pit
Suitable concentration point lifts the handling point of upper self-propelled transport assembly car, track connection handling point as prefabricated piping lane tube coupling
To prefabricated piping lane construction point.
2, first of every section of prefabricated piping lane prefabricated piping lane tube coupling self-propelled is transported into assembly car along rail by design requirement
Assembled starting point is transported to from handling point in road, and first prefabricated piping lane tube coupling is lifted on self-propelled transport with crane in handling point
In the supporting beam of assembly car, make prefabricated piping lane tube coupling longitudinal central axis line and track central axes coincide substantially, at this point, two in parallel
Mobile beam channel due to six jack it under are in off working state and lower than the top surface of the beam of supporting beam so that prefabricated piping lane
Tube coupling is only contacted with supporting beam, and such self-propelled transport assembly car is in stable state when transporting.When reaching construction point, by design
It is required that benchmark, i.e., the horizontal absolute altitude of prefabricated piping lane and the control point of axial location are controlled in measurement, by interim jack by the
A piece of prefabricated piping lane tube coupling is raised until being detached from it after self-propelled transport assembly car with triangular support bracket and brake in axis
Direction is fixed, and handling point is exited and returned to from prefabricated piping lane tube coupling bottom convenient for self-propelled transport assembly car, is prepared next pre-
The transport and assembly of tubulation corridor tube coupling.
3, second prefabricated piping lane tube coupling is accurately lifted by self-propelled by crane in handling point and transports assembly car branch
It supports on beam, second prefabricated piping lane tube coupling longitudinal central axis line and track central axes is made to coincide substantially, by being equipped with driving device
Self-propelled transport assembly car transports second prefabricated piping lane tube coupling near first prefabricated piping lane tube coupling to；According to measuring, this is pre-
The height left and right difference of tubulation corridor tube coupling and preceding a piece of prefabricated pipe corridor tube coupling is away from synchronous to open two parallel mobile beam channel lower parts
Six jack, roller devices on jack and the mobile trough girder that connection is rolled with it, make trough girder with it is prefabricated
Piping lane tube coupling bottom contacts and is lifted out the top surface of the beam of supporting beam, and at this moment prefabricated piping lane tube coupling can according to need in certain model
It is moved left and right in enclosing with shifting chute section steel beam, mobile trough girder is to drive driven roller rotation to realize left and right by driving roller
Mobile, when position up and down is identical as preceding a piece of prefabricated pipe corridor, stubborn screw rod limiting device, determines trough girder both ends
Position.
4, driving self-propelled transport assembly car makes second prefabricated piping lane tube coupling and first prefabricated piping lane tube coupling close up examination
It spells, self-propelled transport assembly car is driven to disengage second prefabricated piping lane tube coupling and first prefabricated piping lane tube coupling after meeting the requirements
Then certain distance drives again convenient for brushwork epoxy resin and wearing interim prestress wire on contact surface between two panels piping lane
Self-propelled transport assembly car assembly is closed up and the interim prestress wire locking of tensioning.
5, interim jack is set for underpining, so that second prefabricated piping lane pipe second prefabricated piping lane tube coupling bottom
Section weight smooth conversion when self-propelled transport assembly car is withdrawn from；Jack makes vehicle on the synchronous retraction vehicle of self-propelled transport assembly car
Body top surface is detached from second prefabricated piping lane tube coupling bottom and exits from hollow car, returns to handling point progress next assembly and applies
Work；Third piece, the 4th ... so analogize, close up assembly until completing the prefabricated piping lane tube coupling of this construction section；
6, the track that this prefabricated piping lane completes section is split out, and has propped up the punching block of filling layer, the permanent steel strand wires of tensioning, so
After be in the milk, take synchronizing device to retract interim jack, this section of prefabricated piping lane made steadily to turn down designed elevation, filling is pre-
Simultaneously mud jacking is closely knit for tubulation corridor bottom gap concrete；After concrete reaches design strength, synchronizing device is taken to retract interim thousand
Jin is pushed up and is withdrawn from, and removes triangular support bracket and brake, and withdraw from interim prestress wire, and it is prefabricated to complete this section of underground synthesis
The construction of piping lane.The present invention has transport 10 ~ 100t of a piece of large scale prefabricated piping lane tube coupling, and biggish component can take double Che Zuhe
Mode is transported.
Self-propelled for prefabricated pipe gallery of the invention transports assembly car, the support including carrying prefabricated piping lane tube coupling
Liang Pingtai, for the wheel, track, driving device of walking, for being lifted jack, the mobile beam channel dress of prefabricated piping lane tube coupling
It sets, and makes mobile beam channel, idler wheel, driving device and the postive stop baffle with screw rod of prefabricated piping lane tube coupling transverse shifting.
Apparatus of the present invention structure is simple, maneuverability mobile member, the features such as occupying little space, and method has easy for construction, safety
Property it is high, do not disturb residents, it is at low cost, it is high-efficient, save large scale equipment expense and removal expense, energy conservation and environmental protection.In the feelings for being not take up place
Safety and stability and the assembly of prefabricated pipe gallery can be quickly finished under condition.
Claims (10)
1. a kind of self-propelled for prefabricated pipe gallery transports assembly car, it is characterised in that: travelled including car body and for car body
Track, the car body includes structural framing, wheel, jack, driving device and synchronously control hydraulic jacking device, the vehicle
Wheel is mounted on structural framing bottom, and structural framing top surface surrounding is provided with supporting beam, and front and back both sides are respectively arranged with slot
Type beam, the trough girder are mounted at the top of jack by idler wheel, and the jack is mounted on structural framing, the driving dress
It sets and is installed on structural framing with synchronously control hydraulic jacking device, the driving device is used to provide drive to wheel and idler wheel
Power, the synchronously control hydraulic jacking device are used to control integral jacking or the decline of jack；It further include prefabricated piping lane
The temporary fastening device of tube coupling, the temporary fastening device include interim hydraulic jack, triangular support bracket, interim prestress steel
Twisted wire and brake, interim hydraulic jack are separated from pre- for underpining prefabricated piping lane tube coupling convenient for self-propelled transport assembly car
After tubulation corridor tube coupling, prefabricated piping lane tube coupling is maintained at original assembled position, is then fixed with triangular support bracket and brake.
2. the self-propelled according to claim 1 for prefabricated pipe gallery transports assembly car, it is characterised in that: the vehicle
The jack of body has six, is evenly arranged under the trough girder of front and back.
3. the self-propelled according to claim 1 for prefabricated pipe gallery transports assembly car, it is characterised in that: the vehicle
Six jack of body are 30 tons with model jack.
4. the self-propelled according to claim 3 for prefabricated pipe gallery transports assembly car, it is characterised in that: the slot
Intermediate idler wheel is driving roller under type beam, remaining is driven roller, and the driving roller is driven by driving device.
5. the self-propelled according to claim 4 for prefabricated pipe gallery transports assembly car, it is characterised in that: the rolling
Wheel middle part is provided with the wheel rim of protrusion, and the trough girder bottom is provided with the locating slot with wheel rim cooperation.
6. the self-propelled according to claim 5 for prefabricated pipe gallery transports assembly car, it is characterised in that: the slot
Type beam left and right ends are provided with screw rod limiting device, and the screw rod limiting device is mounted in supporting beam.
7. the self-propelled according to claim 6 for prefabricated pipe gallery transports assembly car, it is characterised in that: the branch
Postive stop baffle is provided on support beam, the postive stop baffle is located remotely from one end of self-propelled transport assembly car traffic direction.
8. the self-propelled according to claim 7 for prefabricated pipe gallery transports assembly car, it is characterised in that: the vehicle
There are six wheels, and two of them are distributed in headstock, and four additional is distributed in the tailstock.
9. the self-propelled according to claim 8 for prefabricated pipe gallery transports assembly car, it is characterised in that: further include
Remote-control apparatus, the remote-control apparatus is for controlling driving device and synchronously control hydraulic jacking device, to control
The movement of wheel, jack and idler wheel.
10. assembly car is transported for the self-propelled of prefabricated pipe gallery described according to claim 1~any one of 9, it is special
Sign is: both sides are respectively dual-gripper girder construction before and after the structural framing, and trough girder is arranged between dual-gripper beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610629970.7A CN106241234B (en) | 2016-08-04 | 2016-08-04 | A kind of self-propelled transport assembly car for prefabricated pipe gallery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610629970.7A CN106241234B (en) | 2016-08-04 | 2016-08-04 | A kind of self-propelled transport assembly car for prefabricated pipe gallery |
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| Publication Number | Publication Date |
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| CN106241234A CN106241234A (en) | 2016-12-21 |
| CN106241234B true CN106241234B (en) | 2019-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610629970.7A Active CN106241234B (en) | 2016-08-04 | 2016-08-04 | A kind of self-propelled transport assembly car for prefabricated pipe gallery |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107130630B (en) * | 2017-06-16 | 2019-07-09 | 四川省成都普什机电技术研究有限公司 | Piping lane assembling system and piping lane assembling method |
| CN109928160A (en) * | 2019-04-11 | 2019-06-25 | 中国建筑土木建设有限公司 | A kind of large-tonnage piping lane integration of transporting and building machine and application method |
| CN111188362B (en) * | 2020-01-15 | 2022-01-25 | 中国十七冶集团有限公司 | Method for installing steel-made integrated inner support of pipe gallery |
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| JP2001164636A (en) * | 1999-12-07 | 2001-06-19 | Maruei Concrete Industries Co Ltd | Installing system of box culvert and installing machine used for this installing system |
| JP2003293439A (en) * | 2002-04-02 | 2003-10-15 | Geostr Corp | Construction method for large-section box culvert |
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| CN204526937U (en) * | 2015-04-17 | 2015-08-05 | 郑州新大方重工科技有限公司 | A kind of rotation support device of box culvert transport |
| CN204938875U (en) * | 2015-07-23 | 2016-01-06 | 北京谦硕科技有限公司 | City integrated piping lane preformed part hoists and erecting equipment |
| CN105484292A (en) * | 2016-01-09 | 2016-04-13 | 安徽水利开发股份有限公司 | Pipe gallery box culvert transporting and installing device and installing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06330551A (en) * | 1993-05-25 | 1994-11-29 | Ito Seizo | Transportation of box culvert and its device |
| JP2001164636A (en) * | 1999-12-07 | 2001-06-19 | Maruei Concrete Industries Co Ltd | Installing system of box culvert and installing machine used for this installing system |
| JP2003293439A (en) * | 2002-04-02 | 2003-10-15 | Geostr Corp | Construction method for large-section box culvert |
| CN104279000A (en) * | 2014-09-18 | 2015-01-14 | 中国煤炭科工集团太原研究院有限公司 | Automatic bolt mesh laying and connection excavation temporary support device |
| CN204526937U (en) * | 2015-04-17 | 2015-08-05 | 郑州新大方重工科技有限公司 | A kind of rotation support device of box culvert transport |
| CN204938875U (en) * | 2015-07-23 | 2016-01-06 | 北京谦硕科技有限公司 | City integrated piping lane preformed part hoists and erecting equipment |
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| Publication number | Publication date |
|---|---|
| CN106241234A (en) | 2016-12-21 |
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