CN110054508A - A kind of tunnel spray is cared the car - Google Patents
A kind of tunnel spray is cared the car Download PDFInfo
- Publication number
- CN110054508A CN110054508A CN201910284691.5A CN201910284691A CN110054508A CN 110054508 A CN110054508 A CN 110054508A CN 201910284691 A CN201910284691 A CN 201910284691A CN 110054508 A CN110054508 A CN 110054508A
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- Prior art keywords
- vehicle frame
- car
- tunnel
- component
- cared
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- 239000007921 spray Substances 0.000 title claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 10
- 239000003595 mist Substances 0.000 claims description 2
- 238000005286 illumination Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a kind of tunnel sprays to care the car, comprising: the vehicle frame with wheel, and watering component；The length extending direction of vehicle frame is provided at least two watering components；One end of watering component and vehicle frame are rotatablely connected, and the other end for component of sprinkling water connects water source by aqueduct；Nozzle is provided on watering component；Adjusting component is provided on vehicle frame, adjusting component can drive watering component relative to frame movement to adjust position of the nozzle relative to vehicle frame；Driving assembly is additionally provided on vehicle frame, the driving component can drive the wheel movement.It can be seen that a kind of tunnel spray provided by the invention is cared the car, by way of being arranged in and adjusting component and driving assembly is arranged on vehicle frame, so that tunnel provided by the present invention spray is cared the car can realize that tunnel sprays automatically.It can be seen that the present invention can not only reduce operational complicated process, and it is simple to operation, it improves work efficiency；And personnel depaly cost can be greatly reduced.
Description
Technical field
The present invention relates to tunnel maintenance technical field, particularly relates to a kind of tunnel spray and care the car.
Background technique
Tunnel is the engineering works being embedded in stratum, is a kind of form of human use's underground space.However, with
The rapid development of highway, tunnel structure object will also meet and bear when driving passes through in addition to sedimentation and deformation requirement to be met
Wind pressure, when traffic passes through, moisture can evaporate too fast in concrete, form dehydrating phenomena, thus concrete is caused not have
Enough cohesive forces, surface will appear falling off for sheet or powdery.Furthermore concrete lacks because of the premature evaporation of moisture
Moisture, it is likely that it is cracked on its surface, influence the stability of tunnel structure.
Currently, the method usually used is to pass through the liquid such as injection water by staff in order to carry out tunnel maintenance
Mode prevents the generation of above-mentioned phenomenon.However, such mode often consumes a large amount of manpower and material resources, working efficiency is lower,
And cost is also higher.
Summary of the invention
In view of this, to save manpower consumption, improving work it is an object of the invention to propose that a kind of tunnel spray is cared the car
Make efficiency.
Based on above-mentioned purpose, the present invention provides a kind of tunnel sprays to care the car.A kind of tunnel spray is cared the car, comprising:
Vehicle frame with wheel, and watering component；
The length extending direction of the vehicle frame is provided at least two watering components；One end of the watering component and institute
Vehicle frame rotation connection is stated, the other end of the watering component connects water source by aqueduct；Spray is provided on the watering component
Mouth；
Adjusting component is provided on the vehicle frame, the adjusting component can drive the watering component relative to the vehicle
Frame is moved to adjust position of the nozzle relative to the vehicle frame；Driving assembly, the driving are additionally provided on the vehicle frame
Component can drive the wheel movement.
In certain embodiments of the present invention, the adjusting component includes: the driving machine being set on the vehicle frame；Institute
The output end for stating driving machine is connected with the watering component.
In certain embodiments of the present invention, it is described adjust component include: it is described watering component one end with it is described
The sliding rail being arranged at the position of vehicle frame rotation connection；The watering component can move on the sliding rail to adjust the nozzle
Position relative to the vehicle frame.
In certain embodiments of the present invention, tunnel spray is cared the car further include: be set on the vehicle frame and
Distance measuring sensor close to one end of the wheel；The distance measuring sensor is sprayed for measuring traffic apart from the tunnel
The distance cared the car simultaneously generates distance measurement result, and when the distance measurement result is less than apart from preset value, stops the watering component
Only work.
In certain embodiments of the present invention, the watering component includes: at least two connect with the vehicle frame
Frame and the connecting rod for connecting at least two bracket.
In certain embodiments of the present invention, the nozzle is misty nozzle, and the mist nozzle is in the connecting rod
On be spacedly distributed setting.
In certain embodiments of the present invention, the tunnel spray is cared the car further include: is set on the vehicle frame
For adjusting the lifting device of the nozzles spray height.
In certain embodiments of the present invention, the lifting device includes: the telescopic rod connecting with the watering component.
In certain embodiments of the present invention, the tunnel spray is cared the car further include: is set on the vehicle frame
Liquid storage container and the water pump being connect with the liquid storage container；The aqueduct is connected by the water pump with the liquid storage container
It connects.
In certain embodiments of the present invention, lighting device is additionally provided on the vehicle frame.
From the above it can be seen that a kind of tunnel spray provided by the invention is cared the car, set by being arranged on vehicle frame
The mode for adjusting component and driving assembly is set, so that tunnel provided by the present invention spray is cared the car can realize tunnel spray automatically
Leaching, additionally it is possible to which different spray models, control spray frequency, spray angles and spray are implemented according to the difference of specific tunnel situation
Drench time etc..It can be seen that the present invention can not only reduce operational complicated process, and it is simple to operation, it improves work efficiency；
And personnel depaly cost can be greatly reduced.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the main view that a kind of tunnel of the present invention sprays embodiment of caring the car；
Fig. 2 is the rearview that a kind of tunnel of the present invention sprays embodiment of caring the car；
Fig. 3 is the side view that a kind of tunnel of the present invention sprays embodiment of caring the car；
Fig. 4 is another side view that a kind of tunnel of the present invention sprays embodiment of caring the car.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention
The non-equal entity of a same names or non-equal parameter, it is seen that " first " " second " only for the convenience of statement, does not answer
It is interpreted as the restriction to the embodiment of the present invention, subsequent embodiment no longer illustrates this one by one.
In one embodiment provided by the invention, a kind of tunnel spray is cared the car, with reference to Fig. 1 and Fig. 2, comprising: have
The vehicle frame 2 of wheel 1, and watering component；
The length extending direction of vehicle frame 2 is provided at least two watering components；One end of watering component and vehicle frame rotate
Connection, the other end for component of sprinkling water connect water source by aqueduct；Nozzle 3 is provided on watering component；
Adjusting component is provided on vehicle frame 2, adjusting component can drive watering component to move relative to vehicle frame 2 to adjust spray
Position of the mouth 3 relative to vehicle frame 2；Driving assembly is additionally provided on vehicle frame 2, driving assembly can drive wheel movement.
Wherein, the component that will sprinkle water is arranged along the length extending direction of vehicle frame 2, when being sprayed, could preferably spray
Leaching is in the tunnel wall of vehicle two sides.Specifically, at least two watering components are centered on the axis of vehicle frame 2, symmetrical setting,
So that the range that watering component can spray is sufficiently large.With reference to Fig. 1, in the present embodiment, centered on the axis of vehicle frame 2,
Side setting there are three sprinkle water component, the other side be also provided with there are three sprinkle water component；Multiple watering components are respectively arranged at vehicle frame 2
Different height, with realize on a large scale spray.Certainly in other some embodiments of the invention, watering component is not necessarily
It is set as symmetrical, the number for component of sprinkling water not necessarily is set as fixed number, as long as model is sprayed in guarantee that can be as big as possible
It encloses.
In the present embodiment, watering component includes: at least two brackets of at least two brackets 4 connecting with vehicle frame and connection
4 connecting rod 5.As seen from the figure, specifically, Fig. 1 can not see connecting rod 5；With reference to Fig. 3, there are five the settings of bracket 4, and five
4 spaced set of bracket, the stabilization of the component that is conducive to entirely to sprinkle water and spraying range it is uniform, and five brackets 4 pass through connection
Bar 5 connects.It is obvious that in the present invention, the setting number of bracket 4 and connecting rod 5 is not limited to above-mentioned, 4 He of bracket
The effect of connecting rod 5 is in order to enable the process entirely sprayed is more steady and spraying range is more uniform.
Wherein, nozzle 3 is arranged in connecting rod 5.In the present embodiment, nozzle 3 is misty nozzle, and misty nozzle is connecting
Be spacedly distributed setting on bar 5.With reference to Fig. 3 and Fig. 4, it is known that, the nozzle 3 in connecting rod 5 is provided with five.The present invention other
Some embodiments in, the setting number of nozzle 3 is not limited to above-mentioned, is arranged different according to the difference of specific spray environment
Several nozzles 3.It is obvious that in the present invention, the form that nozzle 3 is arranged at equal intervals enables to tunnel spray vehicle to spill
Liquid spraying range it is more uniform.Certainly, in other some embodiments of the invention, nozzle 3 is also necessarily arranged
Misty nozzle can also be other kinds of nozzle 3, such as the nozzle 3 sprayed for liquid.
Specifically, tunnel spray is cared the car further include: the liquid storage container 6 that is set on vehicle frame 2 and is connect with liquid storage container 6
Water pump；Aqueduct is connected by water pump with liquid storage container 6.Wherein, the as aforementioned water source of liquid storage container 6, the one of aqueduct
End watering component be connected, the other end is connected with liquid storage container 6, water pump offer power make the liquid in liquid storage container 6 into
Enter aqueduct, and then be supplied to watering component, and nozzle 3 is made to can be realized spray.Certainly, the liquid stored in liquid storage container 6
Body not only can be water, can also can conserve the spray liquid in tunnel, such as bacteria-removing liquid for other.
In the present embodiment, adjusting component includes: the driving machine being set on vehicle frame 2；The output end of driving machine and watering
Component is connected.Specifically, driving machine controls watering component for driving watering component and moves relative to vehicle frame 2.Wherein, it spills
Movement of the water assembly relative to vehicle frame 1 can be watering component using the junction of vehicle frame 2 and watering component and do circumference fortune as axis
It is dynamic, and then change the spraying range of the nozzle 3 on watering component, the length extending direction that can also be watering component along vehicle frame 1 is transported
It is dynamic, and then change the spraying range of the nozzle 3 on watering component.In preferably some embodiments of the invention, component packet is adjusted
It includes: the sliding rail being arranged at the position that one end of watering component and vehicle frame 2 are rotatablely connected；Watering component can move on the slide rail
To adjust position of the nozzle 3 relative to vehicle frame.
It can be seen that in the present invention, adjusting component by setting, enable watering component in no extraneous work people
Sprinkling is realized under the operation of member, realizes the effect of automatic spray, and during spray, is sprayed more uniform.In larger journey
It on degree, improves work efficiency, saves a large amount of manpower and material resources.
Specifically, adjusting component includes the first controller 7 and first motor 8 etc..Wherein, the first controller 7 can basis
Tunnel needs the degree and range sprayed, spray angles, spraying intensity, spray frequency and the spray model of control watering component
It encloses, i.e., can formulate specific operating mode according to tunnel concrete condition by adjusting component.In addition, in other some embodiments
In, it is additionally provided with timer, when spray, settable spray time and spray duration are suitble to according to tunnel, greatly reduces people
The complexity of member's operation, it is convenient to provide.
In the present embodiment, driving assembly includes second controller 9 and the second motor 10 etc..Wherein, in second controller 9
It is set to the side on vehicle frame 2 and close to wheel 1；Second controller 9 is for controlling the speed of wheel 1 and according to real-time road
The steering of condition control wheel 1.Specifically, tunnel provided by the present invention spray care the car under the action of second controller 9
Speed in tunnel is 11m/min, and certainly, according to the difference of tunnel concrete condition, motion conditions are also different.Apparently
It is that the second motor 10 is used to power to wheel 1 and second controller 9.By the way that driving assembly is arranged, so that tunnel spray is cared the car
Can under its effect automatic running, the operation and control of staff are eliminated, so that whole process is simpler, conveniently.
In the preferable embodiment of the present invention, tunnel spray is cared the car further include: is set on vehicle frame 2 and is leaned on
The distance measuring sensor of one end of nearly wheel 1；Distance measuring sensor is used to measure traffic and sprays the distance cared the car apart from tunnel
And distance measurement result is generated, and when distance measurement result is less than apart from preset value, watering component is made to stop working.
It can be seen that can pass through around measurement sensor measurement perception during tunnel provided by the invention spray cares the car
If whether someone perhaps the close people of vehicle or vehicle and tunnel spray care the car at a distance from be less than apart from preset value,
Distance measurement result can be sent to watering component by measurement sensor, and component of then sprinkling water can stop working, to prevent the row passed by
People or vehicle are by unnecessary influence.Wherein, refer to apart from preset value and care the car in people or vehicle distances tunnel spray
When for apart from preset value, component operation of sprinkling water, pedestrian and vehicle can't be influenced by watering component.
In the present embodiment, the tunnel spray is cared the car further include: is set on vehicle frame 2 and is used to adjust nozzles spray
The lifting device of height.During spray, presumable tunnel setting is higher, but tunnel spray is cared the car and can be sprayed
Height may fail to reach, thus, be provided with lifting device in the present invention, with adjust 3 spray angle of nozzle raising.Or
It says, certain more low positions are arranged in tunnel, and at this time in order to adapt to the situation in specific tunnel, tunnel spray provided by the invention is supported
The mode that shield vehicle can be realized reduction is sprayed onto some more low positions, so that entirely spray range is bigger.
Specifically, in the present embodiment, lifting device includes: the telescopic rod connecting with watering component.Wherein, telescopic rod with
Watering component is connected, and telescopic rod is flexible to increase or reduce radius length of the watering component when carrying out aforementioned circular motion,
The height of this nozzle 3 sprinkling can be also changed.
In some embodiments of the invention other, lifting device is not limited to above-mentioned, and lifting device may also be configured to
2 height of vehicle frame can be adjusted and then adjust the device of 3 spraying altitude of nozzle, generated technical effect is aforementioned already described, herein not
It repeats again.
In the present embodiment, lighting device is additionally provided on vehicle frame.Such as headlamp etc., common tunnel is more dark,
By the way that lighting device is arranged, enables to tunnel spray to care the car during being sprayed, more accurately realize spray
Tunnel；At the same time, by being provided with spray equipment, additionally it is possible to the pedestrian of dealing or vehicle be enabled to clearly see tunnel
Road spray, which is cared the car, to be sprayed, and so as to slowly move ahead, enhances the safety using the vehicle.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, it can in provided attached drawing
It is connect with showing or can not show with the well known power ground of integrated circuit (IC) chip and other components.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this has also contemplated following facts, i.e., about this
The details of the embodiment of a little block diagram arrangements be height depend on will implementing platform of the invention (that is, these details should
It is completely within the scope of the understanding of those skilled in the art).Elaborating that detail (for example, circuit) is of the invention to describe
In the case where exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case where or implement the present invention in the case that these details change.Therefore, these descriptions should be considered as explanation
Property rather than it is restrictive.
Although having been incorporated with specific embodiments of the present invention, invention has been described, according to retouching for front
It states, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, discussed embodiment can be used in other memory architectures (for example, dynamic ram (DRAM)).
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of tunnel spray is cared the car characterized by comprising the vehicle frame with wheel, and watering component；
The length extending direction of the vehicle frame is provided at least two watering components；One end of the watering component and the vehicle
The other end of frame rotation connection, the watering component connects water source by aqueduct；Nozzle is provided on the watering component；
Adjusting component is provided on the vehicle frame, the adjusting component can drive the watering component to transport relative to the vehicle frame
It moves to adjust position of the nozzle relative to the vehicle frame；Driving assembly, the driving component are additionally provided on the vehicle frame
The wheel movement can be driven.
2. tunnel spray according to claim 1 is cared the car, which is characterized in that the adjusting component includes: to be set to institute
State the driving machine on vehicle frame；The output end of the driving machine is connected with the watering component.
3. tunnel spray according to claim 1 is cared the car, which is characterized in that the adjusting component includes: to spill described
The sliding rail being arranged at one end of water assembly and the position of vehicle frame rotation connection；The watering component can be on the sliding rail
Movement is to adjust position of the nozzle relative to the vehicle frame.
4. tunnel according to claim 1 spray is cared the car, which is characterized in that further include: be set on the vehicle frame and
Distance measuring sensor close to one end of the wheel；The distance measuring sensor is sprayed for measuring traffic apart from the tunnel
The distance cared the car simultaneously generates distance measurement result, and when the distance measurement result is less than apart from preset value, stops the watering component
Only work.
5. tunnel according to claim 1 spray is cared the car, which is characterized in that the watering component includes: and the vehicle
At least two brackets of frame connection and the connecting rod for connecting at least two bracket.
6. tunnel spray according to claim 1 is cared the car, which is characterized in that the nozzle is misty nozzle, the mist
Shape nozzle is spacedly distributed setting in the connecting rod.
7. tunnel spray according to claim 1 is cared the car, which is characterized in that further include: it is set on the vehicle frame
For adjusting the lifting device of the nozzles spray height.
8. tunnel spray according to claim 7 is cared the car, which is characterized in that the lifting device includes: to spill with described
The telescopic rod of water assembly connection.
9. tunnel spray according to claim 1 is cared the car, which is characterized in that further include: it is set on the vehicle frame
Liquid storage container and the water pump being connect with the liquid storage container；The aqueduct is connected by the water pump with the liquid storage container
It connects.
10. tunnel spray according to claim 1 is cared the car, which is characterized in that be additionally provided with illumination dress on the vehicle frame
It sets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910284691.5A CN110054508A (en) | 2019-04-10 | 2019-04-10 | A kind of tunnel spray is cared the car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910284691.5A CN110054508A (en) | 2019-04-10 | 2019-04-10 | A kind of tunnel spray is cared the car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110054508A true CN110054508A (en) | 2019-07-26 |
Family
ID=67318627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910284691.5A Pending CN110054508A (en) | 2019-04-10 | 2019-04-10 | A kind of tunnel spray is cared the car |
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| Country | Link |
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| CN (1) | CN110054508A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113121264A (en) * | 2021-04-22 | 2021-07-16 | 义乌工商职业技术学院 | Self-walking concrete curing vehicle for tunnel |
| CN113373813A (en) * | 2021-06-04 | 2021-09-10 | 安徽智恒机械设备有限公司 | Auxiliary mounting device for quickly mounting road screen |
| WO2024011493A1 (en) * | 2022-07-14 | 2024-01-18 | 湖南五新隧道智能装备股份有限公司 | Maintenance trolley |
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|---|---|---|---|---|
| CN113121264A (en) * | 2021-04-22 | 2021-07-16 | 义乌工商职业技术学院 | Self-walking concrete curing vehicle for tunnel |
| CN113121264B (en) * | 2021-04-22 | 2022-02-11 | 义乌工商职业技术学院 | Self-walking concrete curing vehicle for tunnel |
| CN113373813A (en) * | 2021-06-04 | 2021-09-10 | 安徽智恒机械设备有限公司 | Auxiliary mounting device for quickly mounting road screen |
| WO2024011493A1 (en) * | 2022-07-14 | 2024-01-18 | 湖南五新隧道智能装备股份有限公司 | Maintenance trolley |
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