CN111906940A - Slurry stirring and spraying machine for gelled sand gravel dam - Google Patents
Slurry stirring and spraying machine for gelled sand gravel dam Download PDFInfo
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- CN111906940A CN111906940A CN202010710881.1A CN202010710881A CN111906940A CN 111906940 A CN111906940 A CN 111906940A CN 202010710881 A CN202010710881 A CN 202010710881A CN 111906940 A CN111906940 A CN 111906940A
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- mixing
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4203—Details; Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4203—Details; Accessories
- B28C5/4206—Control apparatus; Drive systems, e.g. coupled to the vehicle drive-system
- B28C5/421—Drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4203—Details; Accessories
- B28C5/4234—Charge or discharge systems therefor
- B28C5/4244—Discharging; Concrete conveyor means, chutes or spouts therefor
- B28C5/4258—Discharging; Concrete conveyor means, chutes or spouts therefor using pumps or transporting screws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4296—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport mounted on a tractor or on a tractor wheel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention relates to the technical field of guniting, in particular to a mortar stirring and guniting machine for a cemented gravel dam.
Description
The technical field is as follows:
the invention relates to the technical field of guniting, in particular to a slurry stirring and spraying machine for a cemented sand gravel dam.
Background art:
the cemented sand gravel dam is a new dam type generated according to local conditions on the basis of the theory of rockfill dam and roller compacted concrete dam construction and construction method, the dam type is deeply favored by construction units based on the superior performance of the cemented sand gravel dam, the required space is huge, but the cemented sand gravel dam is short in development duration, particularly the new process and the new equipment of the new dam type are lacked, so that the dam type is mostly limited to temporary engineering or auxiliary engineering in domestic application, no special slurry stirring and spraying link is provided when the cemented sand gravel dam is constructed at present, the existing construction method is to mix by a mixer mixing method or a material pit mixing method after a small amount of cementing materials (mainly cement, fly ash and a small amount of additives) and water are added into natural materials such as riverbed sand gravel, excavating materials, weathered materials and the like, a series of problems exist, and the dosage of the cementing materials in the gravel materials is small, in order to increase the workability of materials, the water-cement ratio is over 1.0 generally, when the sand gravel and the cementing materials are uniformly mixed by a mixer mixing method, the cemented sand gravel dam is characterized in that aggregates are not screened, so that the cementing materials on the unit surface area of the aggregates are not uniformly distributed, the aggregates are not uniform in thickness in the mixing process of the mixer, the actual mixing strength and efficiency are greatly reduced, and the construction cost is increased; the method for turning and mixing the material pits comprises the steps of digging a mixing pit near a dam, unloading gravel materials into the pit twice, manually and uniformly scattering cement, coal ash and additives on the gravel materials according to a design mixing ratio, manually removing oversized aggregate, after an excavator is subjected to dry mixing twice, uniformly adding water according to a design ratio, carrying out wet mixing, after the mixing is finished and the acceptance is qualified, loading and transporting to a construction bin surface. Because the largest characteristic of the gelled sand gravel dam building material is that the content of gelled materials (cement, fly ash and the like) is low, how to evenly distribute the limited gelled materials in the dam body in a time-saving and labor-saving manner and meet the requirements of the stability and the strength of the dam body is very important.
The invention content is as follows:
aiming at the problems that the use amount of the cementing material in the cemented sand gravel dam is small, the cementing material and the aggregate are not uniformly mixed by adopting a stirrer or a material pit stirring method, and the aggregates and the cementing material are separated to different degrees in the processes of loading, unloading, transportation, warehousing and the like in the construction process of the cemented sand gravel dam, the invention provides the slurry stirring and spraying machine for the cemented sand gravel dam, which can uniformly spray the cementing material on the aggregate, realize uniform slurry spraying on the surface of the gravel dam, ensure that the infiltration degree of the sprayed slurry is adaptive to the paving thickness of the aggregates, accurately control the slurry spraying amount in a unit area, continuously stir the water-gel mixture of the cementing material and avoid the water-gel separation phenomenon.
The technical scheme adopted by the invention for solving the technical problems is as follows: a mortar-stirring and guniting machine for cemented sand gravel dam comprises a traction mechanism, a supporting walking mechanism, a booster pump, an adjustable flowmeter, a mortar-stirring mechanism and a mortar-spraying system, wherein the head end of the supporting walking mechanism is fixedly connected with the traction mechanism, the mortar-stirring mechanism is fixedly arranged above the supporting walking mechanism, the mortar-stirring mechanism comprises a stirring tank, a stirring shaft, stirring blades and a motor, the stirring tank is fixed on the supporting walking mechanism, a feeding hole is formed in the top of the stirring tank, a discharging hole is formed in the bottom of the stirring tank, the motor is fixed at the center of the top of the stirring tank, the output shaft of the motor faces downwards, the stirring shaft is vertically arranged in the stirring tank, the stirring shaft and the output shaft of the motor are coaxially and fixedly connected, the stirring blades are fixed on the stirring shaft in a staggered manner, the mortar-spraying mechanism is arranged at the tail end of the, the head end of the supporting frame is fixed with the tail end of the supporting travelling mechanism through a nail, the pulp conveying pipe comprises a main pipeline and a branch pipeline, one end of the main pipeline is hermetically communicated with the discharge port, and the main pipeline extends out of the supporting travelling mechanism to the position above the supporting frame; the branch pipelines are hermetically communicated with the other end of the main pipeline, the branch pipelines are arranged above the supporting frame in a rectangular shape, and the plurality of spray heads are uniformly fixed below the branch pipelines; the booster pump is fixedly installed on the main pipeline, and the adjustable flow meter is arranged on the main pipeline behind the booster pump.
Further, the stirring blade is a stirring helical blade, and the outer diameter of the stirring helical blade is gradually reduced from the bottom to the top.
Further, the traction mechanism is a tractor.
Further, the supporting and traveling mechanism is a four-wheel plate trailer.
Further, still include the guardrail, the guardrail is fixed the week side top of four-wheel flat car.
Furthermore, the agitator tank is cylindrical, and the feeding port is covered with a bell mouth.
Furthermore, the support frame is of a steel truss type, and a tripod drift bolt at the head end of the support frame is fixed at the tail end of the supporting walking mechanism.
Furthermore, the number of the branch pipelines is 6-8, and the branch pipelines are uniformly arranged above the support frame in a rectangular shape.
Furthermore, the number of the spray heads is 4-6, the spray heads are of a rotary spraying type, the spray heads are uniformly and vertically fixed below the branch pipelines, and the height of the spray heads can be adjusted.
Furthermore, the pipe diameter of the main pipeline is 10-15cm, and the pipe diameter of the branch pipeline is 3-5 cm.
The invention has the beneficial effects that: the present invention has four beneficial effects.
First, convenient operation under helical mixing blade's in the agitator tank effect, can carry out continuous stirring with the gelled material mixture, makes its misce bene, guarantees gelled material's homogeneity, has avoided because of the gelled material mixture is because of the gluey material that produces that stews deposits the water and glue separation phenomenon that appears, influences gelled material's the normal use condition.
Second, can be with on the even spraying tiled aggregate of gelled material through the whitewashing system, realize the even whitewashing at gravel stone storehouse face, and under the effect of adjustable flowmeter, the whitewashing volume on the control aggregate that can be accurate, the whitewashing volume can change according to the demand of the site operation condition is nimble, it is nimble to use, and through directly spraying gelled material on the aggregate, and the infiltration degree of spun thick liquid suits with the thickness of paving of aggregate, can avoid loading and unloading, each in-process such as transportation and warehousing, the condition of aggregate and gelled material separation.
The third, the shower nozzle is adjustable, and the operation personnel can adjust the shower nozzle apart from the height of dam facing according to the on-the-spot demand to the ranks interval of shower nozzle sets up rationally, can be better the realization at the even whitewashing of gravel storehouse face.
Fourthly, the construction speed of the cemented sand gravel dam can be increased, the construction efficiency is improved, the use is simple and convenient, the quality of the cemented sand gravel dam can be ensured, the construction cost is reduced, and the construction efficiency of operators is improved.
Description of the drawings:
FIG. 1 is a schematic view of the present invention.
FIG. 2 is a second schematic view of the present invention.
Fig. 3 is a schematic view of the supporting frame of the present invention.
In the figure: 1-tractor, 2-four-wheel plate trailer, 3-stirring blade, 4-stirring shaft, 5-motor, 6-feeding port, 7-stirring tank, 8-booster pump, 9-guardrail, 10-adjustable flowmeter, 11-through nail, 12-support frame, 13-main pipe, 14-branch pipe, 15-spray head and 16-discharge port.
The specific implementation mode is as follows:
the invention is further illustrated with reference to the following figures and examples.
In the embodiment 1, no special cement stirring and slurry spraying link exists in the construction of the cemented sand gravel dam at present, the conventional construction method is to mix the cemented sand gravel with a small amount of cementing materials and water by a stirrer or a material pit stirring method, the use amount of the cementing materials is small, the cementing materials and the aggregates are mixed unevenly by the stirrer or the material pit stirring method, and the aggregates and the cementing materials are separated to different degrees in the processes of loading, unloading, transportation, warehousing and the like.
In view of the above problems, the present embodiment provides a slurry-stirring and spraying machine for cemented sand gravel dam, as shown in fig. 1, comprising a four-wheel plate trailer 2, wherein the head end of the four-wheel plate trailer 2 is fixedly connected to the tail end of a tractor 1, and the tractor 1 drives the four-wheel plate trailer as a traction powerThe vehicle 2 and the tractor 1 are high-horsepower tractors, a stirring tank 7 is arranged above the four-wheel plate trailer 2, the stirring tank 7 is cylindrical, the inner diameter of the stirring tank 7 is 1.5-2m, the height is 1.5m, and the capacity of the stirring tank 7 is 2.6-4.7m3The stirring tank 7 is fixed on the four-wheel plate trailer 2, the bottom of the stirring tank 7 is provided with a discharge hole 16, the top of the stirring tank 7 is fixedly provided with a motor 5, an output shaft of the motor 5 is vertically downward, one side of the top of the stirring tank 7 is provided with a feeding hole 6, the feeding hole 6 is in a covered bell mouth shape, manual or mechanical feeding can be facilitated through the covered bell mouth, and slurry cannot overflow in the advancing and stirring processes of the four-wheel plate trailer 2; the stirring shaft 4 is vertically arranged in the stirring tank 7, the top end of the stirring shaft 4 is fixedly connected with the same axis center of an output shaft of the motor 5, the bottom end of the stirring shaft 4 is rotatably fixed at the inner bottom of the stirring tank 7, the stirring shaft 4 can rotate more stably when the motor 5 drives the stirring shaft 4 to rotate, stirring blades 3 are fixed on the stirring shaft 4 in a staggered manner, the stirring blades 3 have good strength and wear resistance, and the stirring shaft 4 can drive the stirring blades 3 to rotate by rotating, so that the gelled material mixture in the stirring tank 7 is continuously stirred and uniformly mixed, and the phenomenon of water-gel separation caused by the precipitation of a gelled material due to standing of the gelled material mixture is avoided; a supporting frame 12 is arranged at the tail end of the four-wheel plate trailer 2, the supporting frame 12 is of a steel truss type, and a tripod at the head end of the supporting frame 12 is fixedly connected with the four-wheel plate trailer 2 through a through nail 11; a main pipeline 13 is arranged at a discharge port 16, one end of the main pipeline 13 is hermetically communicated with the discharge port 16, the other end of the main pipeline 13 extends out of the four-wheel plate trailer 2 to the position above a support frame 12, the pipe diameter of the main pipeline 13 is 10-15cm, a branch pipeline 14 is arranged at the other end of the main pipeline 13, the pipe diameter of the branch pipeline 14 is 3-5cm, the number of the branch pipelines 14 is 6-8, the branch pipelines 14 are uniformly fixed above the support frame 12 in a rectangular shape, the intervals among the branch pipelines 14 are equal, and the main pipeline 13 and the branch pipelines 14 are made of welded steel pipes; the spray heads 15 are vertically arranged below the branch pipelines 14, the spray heads 15 are of a rotary spraying type, 4-6 spray heads 15 are arranged, the row-column spacing of the spray heads 15 is equal, the height of each spray head 15 is adjustable, and an operator can adjust the height of each spray head 15 from the dam surface according to the field requirementAnd the infiltration degree of the slurry sprayed out of the spray head 15 is adaptive to the paving thickness of gravel; fixedly mounted booster pump 8 on trunk line 13, booster pump 8 adopt vertical single-stage pipeline formula, and the pressure boost effect is better, is equipped with adjustable flowmeter 10 on the trunk line 13 at booster pump 8 rear, through adjusting formula flowmeter 10, control whitewashing volume that can be accurate makes whitewashing volume can change according to the demand of the site operation condition is nimble.
When the stirring device is used, the motor 5 is started to drive the stirring shaft 4 to rotate so as to drive the stirring blades 3, an operator manually or mechanically adds a cementing material mixture into the stirring tank 7 through the feeding port 6, the stirring blades 3 uniformly stir the cementing material mixture in the stirring tank 7, the tractor 1 is used as traction power to pull the four-wheel plate trailer 2 to be above the paved sand gravel material, under the action of the booster pump 8, the cementing material mixture in the stirring tank 7 is pumped into the main pipeline 13, slurry in the main pipeline 13 is uniformly distributed into the branch pipelines 14, the slurry in the branch pipelines 14 is sprayed onto the sand gravel material through the spray heads 15, the penetration degree of the slurry is adaptive to the paving thickness of the sand gravel material, and then the subsequent stirring of the stirring machine can uniformly mix the cementing material with the sand gravel material, so that when the stirring machine is adopted or a material pit stirring method, uneven mixing.
Example 2, a point of difference from example 1 will be mainly described in a slurry-mixing and shotcreting machine for a cemented gravel dam according to the present embodiment.
In this embodiment, stirring vane 3 is stirring helical blade, and stirring vane 3's external diameter reduces by bottom to top gradually, and stirring vane 3's bottom external diameter is great, can be more comprehensive stir the cementitious material of bottom in agitator tank 7, has improved cementitious material's stirring efficiency, makes its mixture more even, has also improved the whitewashing effect.
Example 3, a difference from example 1 will be mainly described in a slurry-mixing and shotcreting machine for a cemented gravel dam according to the present embodiment.
In this embodiment, there is the guardrail at the latter half week side top fixed mounting of four-wheel plate trailer 2, through adding the personal safety of assurance operation personnel that establishes that the guardrail can be better, prevent the condition that operation personnel fell when reinforced through pan feeding mouth 6.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and scope of the present invention are intended to be covered thereby.
Claims (10)
1. The utility model provides a mortar spraying machine is stirred to cemented sand gravel dam, includes drive mechanism, its characterized in that, still including supporting running gear, booster pump, adjustable flowmeter, stirring thick liquid mechanism and whitewashing system, supports running gear head end and drive mechanism fixed connection, stir thick liquid mechanism fixed establishment and support the running gear top, stir thick liquid mechanism and include agitator tank, (mixing) shaft, stirring vane and motor, agitator tank fixes on supporting running gear, is equipped with the pan feeding mouth at agitator tank's top, and agitator tank's bottom is equipped with the discharge gate, the motor is fixed in the center at agitator tank top, and the output shaft of motor is downward, the (mixing) shaft is vertical to be established in agitator tank, (mixing) shaft and motor output shaft coaxial axle fixed connection, stirring vane is crisscross to be fixed on the (mixing) shaft, whitewashing mechanism establishes support the running gear tail end, whitewashing mechanism includes support frame, the thick liquid mechanism includes that, The head end of the support frame is fixed with the tail end of the supporting travelling mechanism through a nail, the slurry conveying pipe comprises a main pipeline and a branch pipeline, one end of the main pipeline is hermetically communicated with the discharge port, and the main pipeline extends out of the supporting travelling mechanism to the position above the support frame; the branch pipelines are hermetically communicated with the other end of the main pipeline, the branch pipelines are arranged above the supporting frame in a rectangular shape, and the plurality of spray heads are uniformly fixed below the branch pipelines; the booster pump is fixedly installed on the main pipeline, and the adjustable flow meter is arranged on the main pipeline behind the booster pump.
2. A cementitious gravel dam slurry mixing shotcrete machine as claimed in claim 1 wherein said mixing blades are mixing screw blades.
3. A cementitious gravel dam slurry churning and shotcrete machine as claimed in claim 1 wherein said hauling mechanism is a tractor.
4. The apparatus as claimed in claim 1, wherein said supporting and traveling mechanism is a four-wheeled plate trailer.
5. A grouter as claimed in claim 4, further comprising a guardrail secured over the periphery of the four wheeled plate trailer.
6. A cementitious gravel dam slurry mixing and shotcreting machine as claimed in claim 1 wherein the mixing tank is cylindrical and the feed port is a bell-mouthed feed port.
7. The apparatus as claimed in claim 1, wherein the supporting frame is a steel truss type, and the tripod at the head end of the supporting frame is fixed to the tail end of the supporting and traveling mechanism.
8. The apparatus as claimed in claim 1, wherein the number of the branch pipes is 6-8, and a plurality of the branch pipes are rectangular and are uniformly arranged above the supporting frame.
9. The apparatus as claimed in claim 1, wherein the number of the nozzles is 4-6, the number of the nozzles is a rotary nozzle, and a plurality of the nozzles are vertically and uniformly fixed below the branch pipes.
10. A slurry churning and shotcreting machine for a cemented sand and gravel dam as claimed in claim 1, wherein the main pipe has a pipe diameter of 10-15cm and the branch pipes have a pipe diameter of 3-5 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010710881.1A CN111906940A (en) | 2020-07-22 | 2020-07-22 | Slurry stirring and spraying machine for gelled sand gravel dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010710881.1A CN111906940A (en) | 2020-07-22 | 2020-07-22 | Slurry stirring and spraying machine for gelled sand gravel dam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111906940A true CN111906940A (en) | 2020-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010710881.1A Pending CN111906940A (en) | 2020-07-22 | 2020-07-22 | Slurry stirring and spraying machine for gelled sand gravel dam |
Country Status (1)
| Country | Link |
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| CN (1) | CN111906940A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709442A (en) * | 2020-12-26 | 2021-04-27 | 四川省和谷文化旅游发展有限公司 | Automatic watering device of construction concrete |
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| CN104210025A (en) * | 2014-05-30 | 2014-12-17 | 福建海源自动化机械股份有限公司 | Casting stirrer adopting segmented screw |
| CN205518952U (en) * | 2016-03-11 | 2016-08-31 | 江苏维尔利环保科技股份有限公司 | Water conservancy recovery unit of solid organic matter of sediment of rubbish |
| CN205517575U (en) * | 2016-04-26 | 2016-08-31 | 董晓然 | Two helical agitator for experiments |
| CN205530144U (en) * | 2016-04-27 | 2016-08-31 | 河南省郑州水利学校 | A high -pressure injection system of being in milk for embankment dam grout |
| CN205886732U (en) * | 2016-07-19 | 2017-01-18 | 武汉武立涂料有限公司 | Coating mixing tank |
| CN108452969A (en) * | 2017-12-19 | 2018-08-28 | 山西云度知识产权服务有限公司 | A kind of tunnel bridge construction refractory gunning equipment |
| CN210880261U (en) * | 2019-10-09 | 2020-06-30 | 王宇 | Spraying machine for spray surface construction |
| CN111347561A (en) * | 2020-04-16 | 2020-06-30 | 胡武刚 | Movable mixer |
-
2020
- 2020-07-22 CN CN202010710881.1A patent/CN111906940A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1749767A2 (en) * | 2005-08-03 | 2007-02-07 | Messer Group GmbH | Method and apparatus for cooling of cement or cementitious powders |
| CN104210025A (en) * | 2014-05-30 | 2014-12-17 | 福建海源自动化机械股份有限公司 | Casting stirrer adopting segmented screw |
| CN205518952U (en) * | 2016-03-11 | 2016-08-31 | 江苏维尔利环保科技股份有限公司 | Water conservancy recovery unit of solid organic matter of sediment of rubbish |
| CN205517575U (en) * | 2016-04-26 | 2016-08-31 | 董晓然 | Two helical agitator for experiments |
| CN205530144U (en) * | 2016-04-27 | 2016-08-31 | 河南省郑州水利学校 | A high -pressure injection system of being in milk for embankment dam grout |
| CN205886732U (en) * | 2016-07-19 | 2017-01-18 | 武汉武立涂料有限公司 | Coating mixing tank |
| CN108452969A (en) * | 2017-12-19 | 2018-08-28 | 山西云度知识产权服务有限公司 | A kind of tunnel bridge construction refractory gunning equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709442A (en) * | 2020-12-26 | 2021-04-27 | 四川省和谷文化旅游发展有限公司 | Automatic watering device of construction concrete |
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Application publication date: 20201110 |
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| RJ01 | Rejection of invention patent application after publication |