CN105818255A - Double-face spraying device and method for high-speed rail precast box beam - Google Patents
Double-face spraying device and method for high-speed rail precast box beam Download PDFInfo
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- CN105818255A CN105818255A CN201610401396.XA CN201610401396A CN105818255A CN 105818255 A CN105818255 A CN 105818255A CN 201610401396 A CN201610401396 A CN 201610401396A CN 105818255 A CN105818255 A CN 105818255A
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- switch board
- walking mechanism
- shower
- prefabricated case
- case beam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/247—Controlling the humidity during curing, setting or hardening
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Special Spraying Apparatus (AREA)
Abstract
The invention discloses a double-face spraying device for a high-speed rail precast box beam. The device comprises a water tank, a water pump, a spraying pipe and a walking mechanism and is characterized in that the water pump is connected with the water tank and the spraying pipe, the spraying pipe comprises a top face spraying set and a bottom face spraying set, the top face spraying set is in a T shape, the vertical pipe of the T shape penetrates through a gap between two adjacent beam side wings, a nozzle is arranged on the transverse pipe of the T shape, and the top face spraying set is used for humidifying and cooling the top face of the precast box beam; the bottom face spraying set is used for humidifying and cooling the bottom face of the precast box beam, and an alarm lamp is arranged on the walking mechanism. The double-face spraying device is simple in structure, reasonable in design, high in intelligent degree, convenient to use and operate, capable of saving labor force, high in spraying efficiency and good in maintenance effect.
Description
Technical field
The present invention relates to a kind of curing system, especially relate to the curing system of a kind of high ferro prefabricated case beam.
Background technology
Why high ferro prefabricated case beam prefabricated employing C50 high performance concrete, after concreting, can gradually condense hardening, be primarily due to the result of concrete hydrating effect.Hydration then needs suitable temperature and humidity condition, therefore to ensure that concrete has suitable curing condition so that it is intensity constantly strengthens, it is necessary to carry out concrete spraying maintenance.After concrete cast, as hot climate, air are dried, carry out not in time spraying maintenance, in concrete, moisture can evaporate too fast, forming dehydrating phenomena, the cement granules that can make to have been formed gelinite can not abundant aquation, it is impossible to be converted into stable crystallization, lack enough cohesive forces, thus can occur that lamellar or powdery come off at concrete surface.Additionally, when concrete not yet possesses enough intensity, the too early evaporation of moisture also can produce bigger contraction distortion, cup shake occurs, affects durability and the globality of concrete.So the maintenance of initial stage is extremely important after concreting, maintenance after concrete final set, should be carried out immediately.
At present, the fixing device used in the curing means of high ferro prefabricated case beam, nozzle is immovable, sprays region and fixes.All spraying region to cover, the quantity arranging nozzle is many；Must there is cross-operation in each nozzles spray region, big to the consumption of water, wastes resource；Existing and spray dead angle, spray maintenance effect is the best.Although using manual method maintenance can solve the problem at sprinkling dead angle, needing to climb up and climbing down, it is general at 4-5 rice that precast box depth of beam is liftoff, extremely dangerous, wastes time and energy, and inefficient, cost is greatly increased.
nullChinese patent notification number 204450828U application number 201520108524.2 discloses the curing system of a kind of high ferro prefabricated case beam，As shown in Figure 1，Including spray equipment in the case of spray in the case to section box girder、For the case outer left side spray equipment of left side outer to the case of section box girder spray with for the case external right side spray equipment that the case external right side of section box girder is sprayed，Described case outer left side spray equipment and case external right side spray equipment are symmetrical arranged，Described case outer left side spray equipment is identical with the structure of case external right side spray equipment and all includes walking mechanism、The outer shower of case and the outer shower driving means of case slided along walking mechanism top for the outer shower of driving box，The outer shower of described case is arranged on the top of walking mechanism，The outer spray head of multiple case is installed on the outer shower of described case，The outer shower of described case drives and is arranged in walking mechanism.Though the problem solving mobile spray, water source is fixed, and relies on the water source connection of flexible pipe and maintenance water, certainly will cannot meet the maintenance of distance multistage box beam, and its operating distance is limited by the length of flexible pipe；The maintenance of the inner space of prefabricated case beam is different with humidity requirement with the curing temperature of flank, and flank is thin to be opened wide exposed many completely, needs many frequencys moistening and lowering temperature, and inner space is the most almost without humidification, and this patent but cannot be distinguished from treating；The upper surface of box beam cannot be carried out moistening and lowering temperature maintenance, and upper surface directly accepts insolation, it is especially desirable to maintenance；Additionally there are the problems such as structure is loaded down with trivial details, fault rate is high, intelligence degree is low.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency of the prior art, it is provided that the two-sided spray equipment of a kind of high ferro prefabricated case beam, its simple in construction, reasonable in design, intelligence degree is high and uses easy to operate, saves artificial, and spray efficiency is high, and maintenance effect is good.
For achieving the above object, the technical solution used in the present invention is: the two-sided spray equipment of a kind of high ferro prefabricated case beam, including water tank, water pump, shower and walking mechanism, it is characterized in that, water pump connects water tank and shower, and shower includes end face spray group and bottom surface spray group, end face spray group is T-shaped, T-shaped VERTICAL TUBE is through the gap adjacent two beam flanks, and T-shaped pipe anyhow arranges nozzle, and end face spray group is for carrying out moistening and lowering temperature to prefabricated case beam end face；nullBottom surface spray group is for carrying out moistening and lowering temperature to prefabricated case beam bottom surface,Described walking mechanism arranges warning lamp，Described bottom surface spray group is provided below recorery parachute，Described recorery parachute arranges the conduit passing back into water tank，Described bottom surface spray group is set to the curved arch suitable with the shape of box beam flank bottom surface，Described curved arch is symmetrical along described VERTICAL TUBE，Nozzle is arranged at curved arch shower，Described bottom surface spray group includes two pipe top nozzle and two side nozzles，Described shower uses split stagewise method to assemble，Each arm uses bend pipe、Tieing or threeway link into an integrated entity，Described shower arranges electromagnetic valve，Described electromagnetic valve is connected with switch board，Described walking mechanism includes track and wheel，Power-driven system drives wheel orbital motion，Power-driven system is connected with switch board，Described track arranges fixing induction point，The induction apparatus matched with fixing induction point is arranged at walking mechanism，Induction apparatus senses that fixing induction point passes to switch board signal，Described switch board connects remote controller by remote signal，Remote control device switch board works.
The method of work of the two-sided spray equipment of a kind of high ferro prefabricated case beam, it is characterised in that comprise the following steps:
Remote control device switch board, switch board controls power-driven system work, or the operating switch of manually opened dynamical system, and power-driven system drives vehicle wheel rotation, and walking mechanism moves ahead along track, and warning lamp opens the step of flicker simultaneously；
Induction apparatus odd-times in walking mechanism senses fixing induction point, and signal is passed to switch board, and switch board controls power-driven system and drives the step of pump working；
In water pump drives water tank, water is sprayed from nozzle by shower, and box beam end face and bottom surface carry out the step of moistening and lowering temperature maintenance；
A water part for nozzle ejection falls into recorery parachute, is passed back into the step of water tank by the conduit of recorery parachute；
Induction apparatus even-times in walking mechanism senses fixing induction point, and signal is passed to switch board, and switch board controls power-driven system and drives the out-of-work step of water pump；
Remote control device switch board, switch board controls power-driven system and quits work, or the operating switch of manually opened dynamical system, and walking mechanism is parked in described track, the step that warning lamp is closed simultaneously；
Also including, remote controller turns off or on electromagnetic valve by remote signal, or manual-lock or open the step of valve in shower branch.
The present invention compared with prior art has the advantage that
1, present configuration is simple, reasonable in design and uses easy to operate, it is possible to spray upper and lower surface at the bottom of the top of box beam.
2, the present invention makes shower slide according to trapped orbit by walking mechanism, with the mobile formation face of line, maintenance district is carried out comprehensive, uniformly spray maintenance, do not spray dead angle, be greatly saved water resource.
3, the present invention can control the sprinkling path of shower Ge Zuge branch according to demand by electromagnetic valve or hand-operated valve, recorery parachute can keep the clean and tidy of working environment remaining Water Sproading, Appropriate application water source, prevents water resource waste.
4, to spray efficiency high for the present invention, and maintenance effect is good, and this device can be with temperature and humidity control system with the use of, it is achieved fully-automatic sprinkling maintenance work.
Below by drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the use state diagram of prior art.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is side-looking structural representation.
Fig. 4 is a kind of example structure schematic diagram of bottom surface spray group.
Fig. 5 is controlling organization process schematic.
Fig. 6 is the another kind of example structure schematic diagram of bottom surface spray group.
Fig. 7 is swivel nozzle structural representation.
Fig. 8 is remote controller schematic diagram.
Description of reference numerals:
1 water tank；2 water pumps；3 showers；4 walking mechanisms；5 nozzles；6 power-driven systems；7 recorery parachutes；8 switch boards；9 remote controllers；10 warning lamps；11 arched top；12 pedestals；13 cases；
31 end face spray groups；32 bottom surface spray groups；33 threeways；34 electromagnetic valves；
311 VERTICAL TUBE；312 manage anyhow；
321 pipe top nozzle 322 side nozzles；323 horizontal horizontal tubes；324 vertical vertical tubes；325 lateral tubes；
41 tracks；42 wheels；43 induction points；44 induction apparatuss；
Central siphon in 51；52 rotary sleeves；53 spouts；
71 conduits.
Detailed description of the invention
As shown in Figure 1, the two-sided spray equipment of the present invention a kind of high ferro prefabricated case beam, including water tank 1, water pump 2, shower 3 and walking mechanism 4, water pump 2 connects water tank 1 and shower 3, shower 3 includes that end face spray group 31 and bottom surface spray group 32,31 end face spray group are that T-shaped, T-shaped VERTICAL TUBE 311 is through the gap adjacent two beam flanks, T-shaped pipe anyhow 312 arranges nozzle 5, and end face spray group 31 is for carrying out moistening and lowering temperature to prefabricated case beam end face；nullBottom surface spray group 32 is for carrying out moistening and lowering temperature to prefabricated case beam bottom surface，The mobile drive nozzle 5 of walking mechanism 4 is relative to the movement of box beam position，Described water pump 2 is connected with power-driven system 6，Described bottom surface spray group 32 is provided below recorery parachute 7，Described recorery parachute 7 arranges the conduit 71 passing back into water tank，Described bottom surface spray group 32 is set to the curved arch suitable with the shape of box beam flank bottom surface，Described curved arch is symmetrical along described VERTICAL TUBE 311，Nozzle 5 is arranged at curved arch shower，Described bottom surface spray group 32 includes two pipe top nozzle 321 and two side nozzles 322，Described shower 3 uses split stagewise method to assemble，Each arm uses bend pipe、Tieing or threeway 33 link into an integrated entity，Described shower arranges electromagnetic valve 34，Described electromagnetic valve 34 is connected with switch board 8，Described walking mechanism 4 includes track 41 and wheel 42，Power-driven system 6 drives wheel 42 to move along track 41，Power-driven system 6 is connected with switch board 8，Described track 41 arranges fixing induction point 43，It is arranged at walking mechanism with the induction apparatus 44 of fixing induction point 43 pairing，Induction apparatus 44 senses that 43 signals of fixing induction point pass to switch board 8，Described switch board 8 connects remote controller 9 by remote signal，Remote controller 9 remote pilot cabinet 8 works.
The method of work of the two-sided spray equipment of a kind of high ferro prefabricated case beam, it is characterised in that comprise the following steps:
Remote controller 9 remote pilot cabinet 8, switch board 8 controls power-driven system 6 and works, or the operating switch of manually opened dynamical system, and power-driven system 6 drives wheel 42 to rotate, and walking mechanism 4 moves ahead along track 41, and warning lamp 10 opens the step of flicker simultaneously；
Induction apparatus 44 odd-times in walking mechanism senses fixing induction point 43, and signal is passed to switch board 8, and switch board 8 controls the step that power-driven system 6 drives water pump 2 to work；
In water pump 2 drives water tank 1, water is sprayed from nozzle 5 by shower 3, and box beam end face and bottom surface carry out the step of moistening and lowering temperature maintenance；
A water part for nozzle 5 ejection falls into recorery parachute 7, is passed back into the step of water tank by the conduit 71 of recorery parachute 7；
Induction apparatus 44 even-times in walking mechanism senses fixing induction point 43, and signal is passed to switch board 8, and switch board 8 controls power-driven system 6 and drives the out-of-work step of water pump 2；
Remote controller 9 remote pilot cabinet 8, switch board 8 controls power-driven system 6 and quits work, or the operating switch of manually opened dynamical system, and walking mechanism 4 is parked in described track 41, the step that warning lamp 10 is closed simultaneously；
Also including, remote controller 9 turns off or on electromagnetic valve 34 by remote signal, or manual-lock or open the step of valve in shower 3 branch.
Described conduit 71, at the same time as the overflow pipe of water tank 1, can overflow from overflow pipe when water level rise trunkful in water tank 1, and operator can judge water level from overflow pipe.
Uniformly being provided with multiple nozzle 5 on described shower 3, spray the linear spray on box beam two sides because the displacement of walking mechanism becomes face property, spray scope does not the most stay dead angle；
Described nozzle 5 is atomization churning mouth, it is made up of interior central siphon 51, rotary sleeve 52, spout 53, radially non-contact seals gap is left between interior central siphon 51 and rotary sleeve 52, water jet lateral thrust causes rotary sleeve 52 to rotate, the recoil moment that i.e. water jet produces overcomes the moment of friction between rotary sleeve 52 and interior central siphon 51, drive rotary sleeve 52 to rotate, make rotary sleeve 52 have the moment of momentum of rotation.
Described switch board 8 and temperature sensor, humidity sensor Electricity Federation, when box beam ambient temperature or humidity reach predetermined value, enabling signal is passed to switch board 8 by sensor, switch board controls power-driven system 6 and starts working, stop after covering whole impulse stroke according to predetermined track, it is achieved fully-automatic sprinkling maintenance work.
Described walking mechanism arranges warning lamp 10 and blows a whistle, and warning crosses the staff of track and takes care.
In order to lift by crane conveniently, the sectional portraitlandscape of prefabricated case beam is that matrix arrangement is laid, and one section of box beam has one section of relatively wide distance in the vertical with another section of box beam, as passageway, can pass through for operator；One section of box beam has a narrower gap in the horizontal with another section of box beam, take up room to save, the flank of two sections of box beams is relative the most in the horizontal, a gap is had between relative flank, this gap is the space worn in this device VERTICAL TUBE, walking mechanism is along orbital drive to moving ahead, and VERTICAL TUBE 311 also moves ahead in this gap therewith, will not meet with obstruction.
The device of this patent passes through in the middle of the flank of adjacent two box beams, two-sided moistening and lowering temperature maintenance, and once the part of each half of two box beams of spray radiation, sprays second half during backhaul.
Fixing induction point 43 is arranged on track 41 original position and end position needing to spray box beam, terminate the spray of one section of box beam through the described passageway passed through for operator, device keeps only moving ahead the state not sprayed, through passageway, when arriving the position that another section of box beam need to spray, odd-times senses fixing induction point 43, starts again at spray.
Described power-driven system 6 includes that electromotor connects distribution box, and distribution box connects reductor and water pump 2, and reductor connects running wheel by gear.During use, first 1) electromotor oiling and water tank are added water；2) starter-generator is powered；3) start reductor driven gear and rotate driving walking mechanism walking；4) power-driven system 6 starts water pump, opens Water supply switch valve, wet curing beam body；5) maintenance terminates, and closes electromotor.
Inventor is through the preferred following parameter of great many of experiments, water tank bottom is square base, its length, width and height are respectively 3m*1.8m*1.1m, top is semicircular arc top 11, its half circular diameter, length, height are respectively 1.8 meters, 3m, 0.4m, the width that half circular diameter is square with water tank bottom is equal, and the length length square with water tank bottom is equal.Arched top 11 arranges cylindrical base 12, is used for installing fixing outside shower, and post diameters is 20cm, and height is 30cm.The height of VERTICAL TUBE 311 is 2.2m, anyhow a length of 14.2m of pipe 312.Bottom surface spray group 32 includes horizontal horizontal tube 323 and two vertical vertical tubes 324, vertical vertical tube 324 end installs two pipe top nozzle 321, horizontal horizontal tube 323 is 1.9m, two vertical vertical tubes 324 are 0.55m, it is 0.89m that described vertical vertical tube 324 arranges two lateral tubes 325, and lateral tube 325 end arranges two side nozzles 322.Water tank 1 power-driven system disposed behind 6 and switch board 8, power-driven system 6 and the square case of switch board 8 peripheral hardware 13, square case 13 length, width and height are respectively 0.8m*1.8m*0.55cm.Described case 13 is wholely set with water tank 1, and the wheel 42 of walking mechanism 4 is separately positioned on water tank 1 and the bottom of case 13.
Present configuration is simple, reasonable in design and uses easy to operate, it is possible to spray upper and lower surface at the bottom of the top of box beam；Make shower 3 slide according to trapped orbit by walking mechanism 4, with the mobile formation face of line, maintenance district is carried out comprehensive, uniformly spray maintenance, do not spray dead angle, be greatly saved water resource；Can be controlled the sprinkling path of shower Ge Zuge branch according to demand by electromagnetic valve or hand-operated valve, recorery parachute 7 can keep the clean and tidy of working environment remaining Water Sproading, Appropriate application water source, prevents water resource waste；This device terminates spray when safeguarding, recorery parachute 7 can collect, and saves space, prevents from blocking operator's sight line.Described shower 3 uses split stagewise method to assemble, it is simple to controlling organization is installed in segmentation, it is simple to adjusts the length height of pipeline, assembles simple, it is easy to malfunction elimination, easy to maintenance.Described bottom surface spray group 32 includes two pipe top nozzle 321 and two side nozzles 322, and quantity is the most smart, and radiation scope is wide, and low cost efficiency is high.It is high that the present invention sprays efficiency, and maintenance effect is good.
The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure transformation above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. the two-sided spray equipment of a high ferro prefabricated case beam, including water tank, water pump, shower and walking mechanism, it is characterized in that, water pump connects water tank and shower, shower includes end face spray group and bottom surface spray group, and end face spray group is that T-shaped, T-shaped VERTICAL TUBE is through the gap adjacent two beam flanks, T-shaped pipe anyhow arranges nozzle, and end face spray group is for carrying out moistening and lowering temperature to prefabricated case beam end face；Bottom surface spray group is for carrying out moistening and lowering temperature to prefabricated case beam bottom surface, and described walking mechanism arranges warning lamp.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 1, it is characterised in that described bottom surface spray group is provided below recorery parachute, described recorery parachute arranges the conduit passing back into water tank.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 1 and 2, it is characterized in that, described bottom surface spray group is set to the curved arch suitable with the shape of box beam flank bottom surface, and described curved arch is symmetrical along described VERTICAL TUBE, and nozzle is arranged at curved arch shower.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 1 and 2, it is characterised in that described bottom surface spray group includes two pipe top nozzle and two side nozzles.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 1 and 2, it is characterised in that described shower uses split stagewise method to assemble, each arm uses bend pipe, tieing or threeway to link into an integrated entity.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 1 and 2, it is characterised in that described shower arranges electromagnetic valve, described electromagnetic valve is connected with switch board.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 1 and 2, it is characterised in that described walking mechanism includes track and wheel, power-driven system drives wheel orbital motion, and power-driven system is connected with switch board.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 7, it is characterized in that, described track arranges fixing induction point, and the induction apparatus matched with fixing induction point is arranged at walking mechanism, and induction apparatus senses that fixing induction point passes to switch board signal.
The two-sided spray equipment of a kind of high ferro prefabricated case beam the most according to claim 7, it is characterised in that described switch board connects remote controller by remote signal, remote control device switch board works.
10. the method for work of the two-sided spray equipment of a high ferro prefabricated case beam, it is characterised in that comprise the following steps:
Remote control device switch board, switch board controls power-driven system work, or the operating switch of manually opened dynamical system, and power-driven system drives vehicle wheel rotation, and walking mechanism moves ahead along track, and warning lamp opens the step of flicker simultaneously；
Induction apparatus odd-times in walking mechanism senses fixing induction point, and signal is passed to switch board, and switch board controls power-driven system and drives the step of pump working；
In water pump drives water tank, water is sprayed from nozzle by shower, and box beam end face and bottom surface carry out the step of moistening and lowering temperature maintenance；
A water part for nozzle ejection falls into recorery parachute, is passed back into the step of water tank by the conduit of recorery parachute；
Induction apparatus even-times in walking mechanism senses fixing induction point, and signal is passed to switch board, and switch board controls power-driven system and drives the out-of-work step of water pump；
Remote control device switch board, switch board controls power-driven system and quits work, or the operating switch of manually opened dynamical system, and walking mechanism is parked in described track, the step that warning lamp is closed simultaneously；
Also including, remote controller turns off or on electromagnetic valve by remote signal, or manual-lock or open the step of valve in shower branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610401396.XA CN105818255B (en) | 2016-06-10 | 2016-06-10 | A kind of two-sided spray equipment and method of high ferro prefabricated case beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610401396.XA CN105818255B (en) | 2016-06-10 | 2016-06-10 | A kind of two-sided spray equipment and method of high ferro prefabricated case beam |
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| CN105818255A true CN105818255A (en) | 2016-08-03 |
| CN105818255B CN105818255B (en) | 2018-09-07 |
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| CN106903785A (en) * | 2017-03-15 | 2017-06-30 | 中交第三公路工程局有限公司 | Automatic spray control system |
| CN107234718A (en) * | 2017-06-12 | 2017-10-10 | 中铁十局集团第三建设有限公司 | A kind of concrete box girder maintenance aid and its application method |
| CN113997399A (en) * | 2021-09-10 | 2022-02-01 | 中国铁路设计集团有限公司 | Special integrated distributed spray head assembly for special-shaped space curved surface special spraying |
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| CN107234718A (en) * | 2017-06-12 | 2017-10-10 | 中铁十局集团第三建设有限公司 | A kind of concrete box girder maintenance aid and its application method |
| CN113997399A (en) * | 2021-09-10 | 2022-02-01 | 中国铁路设计集团有限公司 | Special integrated distributed spray head assembly for special-shaped space curved surface special spraying |
| CN113997399B (en) * | 2021-09-10 | 2022-11-18 | 中国铁路设计集团有限公司 | Special integrated distributed spray head assembly for special-shaped space curved surface special spraying |
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| CN105818255B (en) | 2018-09-07 |
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