CN110925464B - Integrated valve for tunnel construction - Google Patents
Integrated valve for tunnel construction Download PDFInfo
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- CN110925464B CN110925464B CN201911034194.6A CN201911034194A CN110925464B CN 110925464 B CN110925464 B CN 110925464B CN 201911034194 A CN201911034194 A CN 201911034194A CN 110925464 B CN110925464 B CN 110925464B
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- 238000010276 construction Methods 0.000 title claims abstract description 20
- 230000003139 buffering effect Effects 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 16
- 239000000203 mixture Substances 0.000 description 7
- 238000005507 spraying Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Nozzles (AREA)
Abstract
An integrated valve for tunnel construction comprises a concrete inlet, an accelerator inlet, a mixing part, a diameter reducing part, an expanding part, a turning part, a converging pipeline, a buffering convex cavity, a valve core, a valve rod, a valve driving part, a pressure relief valve, an air valve plate, a bump, an air duct connecting port, an air duct sinking part, an inclined air duct, an integrated valve outlet, an integrated block body and an integrated block connecting piece; the pressure relief valve comprises a lower piston, a piston rod, an upper piston hole, a spring, a valve cap hole, a pressure relief valve cavity and a diameter expanding cavity. The concrete inlet is arranged at a position below the central line of the left wall of the integrated block body, the accelerator inlet is arranged below the concrete inlet, the right end of the concrete inlet is communicated with the mixing part, the upper end of the mixing part is flush with the upper end of the concrete inlet, the lower end of the mixing part opposite to the lower end of the concrete inlet protrudes downwards, and the protruding part is communicated with the accelerator inlet.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to an integrated valve for tunnel construction.
Background
In the construction process of various mine roadways, railway and highway tunnels, water conservancy culverts, various underground projects, high-rise building foundation pits, military projects and the like in China, an international advanced spray anchor support construction method is widely adopted for early support. Concrete (concrete) spraying machines are the main equipment of the operation and play a crucial role, and the concrete spraying machines are generally divided into three types, namely dry spraying machines, wet spraying machines and wet spraying machines.
In the practical use of the wet blasting machine, there are the following problems:
1. concrete pipeline, accelerator pipeline, the cooperation of wind pressure pipe of prior art influence each other when working, produce the shake to the pressure that makes nozzle department produces the shake, thereby sprays inhomogeneous not in place, can make the nozzle shake when serious.
2. Concrete pipeline, accelerator pipeline, wind pressure pipe during cooperation work of prior art pipeline scatter respectively or fix alone, have the problem that is difficult to compromise cooperation distance and fixed distance when fixing alone, just for example cooperate but far away from the mounting.
3. The concrete conveying pipeline in the prior art has the problem that the concrete conveying pipeline is difficult to be fully fused with the accelerating agent, or the concrete conveying pipeline needs a specific structure to be implemented although the concrete conveying pipeline is fused, so that the cost is increased.
4. The air pipe in the prior art is not uniform enough in air supply, thereby indirectly causing uneven material injection.
5. The tuber pipe of prior art, when spraying trouble internal pressure increase, lead to the backward flow tuber pipe of income of material easily, pollute and destroy the tuber pipe.
6. In the prior art injection, when the internal pressure of the injection failure is increased, the damage of the confluence pipeline is easily caused.
7. The discharge valve in the prior art is often simple in structure, poor in adaptability, is a simple one-way valve and cannot adapt to complex working conditions.
Disclosure of Invention
In order to overcome the above problems, the present invention proposes a solution to solve the above problems simultaneously.
The technical scheme adopted by the invention for solving the technical problems is as follows: an integrated valve for tunnel construction comprises a concrete inlet, an accelerator inlet, a mixing part, a diameter reducing part, an expanding part, a turning part, a converging pipeline, a buffering convex cavity, a valve core, a valve rod, a valve driving part, a pressure relief valve, an air valve plate, a bump, an air duct connecting port, an air duct sinking part, an inclined air duct, an integrated valve outlet, an integrated block body and an integrated block connecting piece; the pressure relief valve comprises a lower piston, a piston rod, an upper piston hole, a spring, a valve cap hole, a pressure relief valve cavity and an expanding cavity;
a concrete inlet is arranged below the central line of the left wall of the integrated block body, an accelerator inlet is arranged below the concrete inlet, the right end of the concrete inlet is communicated with a mixing part, the upper end of the mixing part is flush with the upper end of the concrete inlet, the lower end of the mixing part protrudes downwards relative to the lower end of the concrete inlet, and the protruding part is communicated with the accelerator inlet; the right end of the mixing part is communicated with a reducing part, and the diameter of the reducing part is smaller than that of the concrete inlet; the right end of the diameter reducing part is communicated with the diameter expanding part, the lower end of the diameter expanding part is flush with the lower end of the diameter reducing part, and the upper end of the diameter expanding part protrudes upwards relative to the upper end of the diameter reducing part; the right end of the diameter expanding part is communicated with the direction changing part, the upper end of the direction changing part is flush with the upper end of the diameter reducing part, and the lower end of the direction changing part protrudes downwards relative to the lower end of the diameter expanding part; the right end of the turning part is communicated with the confluence pipeline, and a buffer convex cavity is arranged at the upper end of the confluence pipeline; the confluence pipeline is communicated or disconnected with an outlet of the integrated valve through the opening and closing of the valve core;
an integrated block connecting piece is arranged at the upper left of the integrated block body and connected with a spray gun; an air duct connecting port is arranged on the right side of the integrated block connecting piece, the air duct connecting port vertically extends downwards, the lower end of the air duct connecting port forms an air duct sinking part through radial expansion, the diameter difference between the upper end of the air duct sinking part and the air duct connecting port forms a step, an inclined air duct extends from the right side of the air duct sinking part to the right lower side, and the lower end of the inclined air duct is communicated with the buffer convex cavity; a lug is arranged on the inner side of the right wall of the inclined air duct; when the backflow working condition occurs, the air valve plate is attached to the step to realize closing;
the inclined air duct is characterized in that a pressure relief valve is arranged on the right side of the inclined air duct, the valve rod is arranged on the right side of the pressure relief valve, the valve rod is driven by a valve driving piece, and a valve core is arranged at the lower end of the valve rod.
Preferably, the pressure relief valve cavity comprises an expanding cavity in the middle and cavities at two ends, the cavities at two ends accommodate the upper piston and the lower piston in an initial state, the piston rod is accommodated in the expanding cavity, an upper piston hole is formed in the upper piston, a spring is arranged above the upper piston, a valve cap is arranged above the spring and is in threaded connection with the integrated block, a valve cap hole is formed in the valve cap, pressure below the lower piston is increased to push the lower piston to move to the lower end of the lower piston to enter the expanding cavity, the expanding cavity is communicated with the confluence pipeline, and redundant pressure is discharged through the upper piston hole and the valve cap hole.
Preferably, the upper end of the air valve plate is provided with a coil spring.
Preferably, the valve driver is an electric motor.
Preferably, the valve element is a ball.
Preferably, the valve actuator is located outside the manifold block.
Preferably, the number of the upper piston holes is two, and the number of the bonnet holes is two.
Preferably, the integrated block is fixed above the spray gun and connected to the spray nozzle of the spray gun to the right.
The invention has the beneficial effects that:
1. to background art 1 st point, adopted the design of integrated valve piece, integrated concrete pipe, wind pressure pipeline, accelerator pipeline, relief valve, total accuse valve to a valve piece in, arrange through reasonable position and realize concentrated technical scheme.
2. To background art 2 nd point, on the basis of integrated to a valve piece, set up the manifold block connecting piece and be connected with the spray gun lower carriage at the upside of manifold block, set up the material interface connection of threaded connection structure and spray gun at the manifold block export, realized unified overall arrangement and fixed.
3. To the 3 rd point that the background art provided, with the accelerator entry setting with the concrete entry syntropy, input simultaneously in the mixing portion, make the material extrusion mix in the portion of reducing in proper order, make the material inflation mix in the portion of expanding, make the material collision mix in the diversion portion, make the material intensive mixing through the three shape change in the pipeline.
4. Aiming at the 4 th point provided by the background technology, a buffer convex cavity structure is arranged to enable the wind power in the inclined air duct to be uniformly diffused.
5. To the 5 th point that the background art provided, utilize the lug to make the wind valve plate can't paste totally and lean on oblique wind channel upper wall to when making the material flow backward, the wind valve plate can upwards be closed.
6. In the 6 th point proposed by the background art, a pressure relief valve is integrated in the integration valve block.
7. Aiming at the 7 th point of the background technology, an I-shaped piston, an expansion cavity and a corresponding pore passage are matched in an integrated block to construct a pressure relief main passage.
Note: the foregoing designs are not sequential, each of which provides a distinct and significant advance in the present invention over the prior art.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a structural view of a spray gun for tunnel construction according to the present invention
FIG. 2 is a schematic view of an integrated valve block for tunnel construction according to the present invention
FIG. 3 is an enlarged view of a pressure relief valve in the integration valve for tunnel construction according to the present invention
In the figures, the reference numerals are as follows:
1. the device comprises a nozzle 2, a material interface 3, a lower bracket 4, a first motor 5, an upper bracket 6, a connecting piece 7, a second motor 8, a lower bracket hanging piece 9, a concrete inlet 10, an accelerator inlet 11, a mixing part 12, a diameter reducing part 13, an expanding part 14, a direction changing part 15, a confluence pipeline 16, a buffer convex cavity 17, a valve core 18, a valve rod 19, a valve driving piece 20, a pressure relief valve 21, an air valve plate 22, a convex block 23, an air duct connecting port 24, an air duct sinking part 25, an inclined air duct 26, an expanding cavity 27, a lower piston 28, a piston rod 29, an upper piston hole 30, a spring 31, a valve cap hole 32, a valve cap 33, a valve cap hole 34, an upper piston hole 35, an integrated valve outlet 36, a pressure relief valve cavity 37, an integrated block 38, an integrated block connecting piece 39 and an.
Detailed Description
As shown in the figure: an integrated valve for tunnel construction comprises a concrete inlet, an accelerator inlet, a mixing part, a diameter reducing part, an expanding part, a turning part, a converging pipeline, a buffering convex cavity, a valve core, a valve rod, a valve driving part, a pressure relief valve, an air valve plate, a bump, an air duct connecting port, an air duct sinking part, an inclined air duct, an integrated valve outlet, an integrated block body and an integrated block connecting piece; the pressure relief valve comprises a lower piston, a piston rod, an upper piston hole, a spring, a valve cap hole, a pressure relief valve cavity and an expanding cavity;
as shown in the figure: a concrete inlet is arranged below the central line of the left wall of the integrated block body, an accelerator inlet is arranged below the concrete inlet, the right end of the concrete inlet is communicated with a mixing part, the upper end of the mixing part is flush with the upper end of the concrete inlet, the lower end of the mixing part protrudes downwards relative to the lower end of the concrete inlet, and the protruding part is communicated with the accelerator inlet; the right end of the mixing part is communicated with a reducing part, and the diameter of the reducing part is smaller than that of the concrete inlet; the right end of the diameter reducing part is communicated with the diameter expanding part, the lower end of the diameter expanding part is flush with the lower end of the diameter reducing part, and the upper end of the diameter expanding part protrudes upwards relative to the upper end of the diameter reducing part; the right end of the diameter expanding part is communicated with the direction changing part, the upper end of the direction changing part is flush with the upper end of the diameter reducing part, and the lower end of the direction changing part protrudes downwards relative to the lower end of the diameter expanding part; the right end of the turning part is communicated with the confluence pipeline, and a buffer convex cavity is arranged at the upper end of the confluence pipeline; the confluence pipeline is communicated or disconnected with an outlet of the integrated valve through the opening and closing of the valve core;
as shown in the figure: an integrated block connecting piece is arranged at the upper left of the integrated block body and connected with a spray gun; an air duct connecting port is arranged on the right side of the integrated block connecting piece, the air duct connecting port vertically extends downwards, the lower end of the air duct connecting port forms an air duct sinking part through radial expansion, the diameter difference between the upper end of the air duct sinking part and the air duct connecting port forms a step, an inclined air duct extends from the right side of the air duct sinking part to the right lower side, and the lower end of the inclined air duct is communicated with the buffer convex cavity; a lug is arranged on the inner side of the right wall of the inclined air duct; when the backflow working condition occurs, the air valve plate is attached to the step to realize closing;
as shown in the figure: the inclined air duct is characterized in that a pressure relief valve is arranged on the right side of the inclined air duct, the valve rod is arranged on the right side of the pressure relief valve, the valve rod is driven by a valve driving piece, and a valve core is arranged at the lower end of the valve rod. The pressure relief valve cavity comprises an expanding cavity in the middle and cavities at two ends, the cavities at two ends contain the upper piston and the lower piston in an initial state, the piston rod is contained in the expanding cavity, an upper piston hole is formed in the upper piston, a spring is arranged above the upper piston, a valve cap is arranged above the spring and is in threaded connection with the integrated block body, a valve cap hole is formed in the valve cap, pressure below the lower piston is increased to push the lower end of the lower piston to move to the lower end of the lower piston to enter the expanding cavity, the expanding cavity is communicated with a confluence pipeline, and redundant pressure is discharged through the upper piston hole and the valve cap hole.
As shown in the figure: and a coil spring is arranged at the upper end of the air valve plate. The valve driver is an electric motor. The valve core is a sphere. The valve drive is located outside the manifold block. The number of the upper piston holes is two, and the number of the valve cap holes is two. The integrated block body is fixed on the spray gun at the upper part and is connected to a nozzle of the spray gun at the right part.
The principle of material mixing is as follows: the accelerator inlet is arranged in the same direction as the concrete inlet and is simultaneously input into the mixing part, so that co-current mixing is facilitated; make the material extrusion mix at the portion that contracts of footpath in proper order, make the material inflation mix at the hole enlargement portion, and the centrifugation mixes, makes the material collision mix at the diversion portion, and the material of normal flow direction and the material collision mix of redirecting, make the material intensive mixing through three shape change in the pipeline.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An integrated valve for tunnel construction comprises a concrete inlet, an accelerator inlet, a mixing part, a diameter reducing part, an expanding part, a turning part, a converging pipeline, a buffering convex cavity, a valve core, a valve rod, a valve driving part, a pressure relief valve, an air valve plate, a bump, an air duct connecting port, an air duct sinking part, an inclined air duct, an integrated valve outlet, an integrated block body and an integrated block connecting piece; the pressure relief valve comprises a lower piston, a piston rod, an upper piston hole, a spring, a valve cap hole, a pressure relief valve cavity and an expanding cavity;
the method is characterized in that: a concrete inlet is arranged below the central line of the left wall of the integrated block body, an accelerator inlet is arranged below the concrete inlet, the right end of the concrete inlet is communicated with a mixing part, the upper end of the mixing part is flush with the upper end of the concrete inlet, the lower end of the mixing part protrudes downwards relative to the lower end of the concrete inlet, and the protruding part is communicated with the accelerator inlet; the right end of the mixing part is communicated with a reducing part, and the diameter of the reducing part is smaller than that of the concrete inlet; the right end of the diameter reducing part is communicated with the diameter expanding part, the lower end of the diameter expanding part is flush with the lower end of the diameter reducing part, and the upper end of the diameter expanding part protrudes upwards relative to the upper end of the diameter reducing part; the right end of the diameter expanding part is communicated with the direction changing part, the upper end of the direction changing part is flush with the upper end of the diameter reducing part, and the lower end of the direction changing part protrudes downwards relative to the lower end of the diameter expanding part; the right end of the turning part is communicated with the confluence pipeline, and a buffer convex cavity is arranged at the upper end of the confluence pipeline; the confluence pipeline is communicated or disconnected with an outlet of the integrated valve through the opening and closing of the valve core;
an integrated block connecting piece is arranged at the upper left of the integrated block body and connected with a spray gun; an air duct connecting port is arranged on the right side of the integrated block connecting piece, the air duct connecting port vertically extends downwards, the lower end of the air duct connecting port forms an air duct sinking part through radial expansion, the diameter difference between the upper end of the air duct sinking part and the air duct connecting port forms a step, an inclined air duct extends from the right side of the air duct sinking part to the right lower side, and the lower end of the inclined air duct is communicated with the buffer convex cavity; a lug is arranged on the inner side of the right wall of the inclined air duct; when the backflow working condition occurs, the air valve plate is attached to the step to realize closing;
the inclined air duct is characterized in that a pressure relief valve is arranged on the right side of the inclined air duct, the valve rod is arranged on the right side of the pressure relief valve, the valve rod is driven by a valve driving piece, and a valve core is arranged at the lower end of the valve rod.
2. The integrated valve for tunnel construction according to claim 1, wherein: the pressure relief valve cavity comprises an expanding cavity in the middle and cavities at two ends, the cavities at two ends contain the upper piston and the lower piston in an initial state, the piston rod is contained in the expanding cavity, the upper piston is provided with an upper piston hole, a spring is arranged above the upper piston, a valve cap is arranged above the spring and is in threaded connection with the integrated block body, a valve cap hole is formed in the valve cap, pressure below the lower piston is increased to push the lower piston to move to the lower end of the lower piston to enter the expanding cavity, the expanding cavity is communicated with a confluence pipeline, and redundant pressure is discharged through the upper piston hole and the valve cap hole.
3. The integrated valve for tunnel construction according to claim 1, wherein: and a coil spring is arranged at the upper end of the air valve plate.
4. The integrated valve for tunnel construction according to claim 1, wherein: the valve driver is an electric motor.
5. The integrated valve for tunnel construction according to claim 1, wherein: the valve core is a sphere.
6. The integrated valve for tunnel construction according to claim 1, wherein: the valve drive is located outside the manifold block.
7. The integrated valve for tunnel construction according to claim 2, wherein: the number of the upper piston holes is two, and the number of the valve cap holes is two.
8. The integrated valve for tunnel construction according to claim 1, wherein: the integrated block body is fixed on the spray gun at the upper part and is connected to a nozzle of the spray gun at the right part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034194.6A CN110925464B (en) | 2019-10-29 | 2019-10-29 | Integrated valve for tunnel construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034194.6A CN110925464B (en) | 2019-10-29 | 2019-10-29 | Integrated valve for tunnel construction |
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| Publication Number | Publication Date |
|---|---|
| CN110925464A CN110925464A (en) | 2020-03-27 |
| CN110925464B true CN110925464B (en) | 2021-06-04 |
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| CN201911034194.6A Active CN110925464B (en) | 2019-10-29 | 2019-10-29 | Integrated valve for tunnel construction |
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| CN (1) | CN110925464B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963204B (en) * | 2020-07-20 | 2022-04-01 | 中铁五局集团第一工程有限责任公司 | Needle beam type trolley |
| CN111963205B (en) * | 2020-07-20 | 2022-04-01 | 中铁五局集团第一工程有限责任公司 | Trolley three-section type pouring working method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2823625Y (en) * | 2005-05-25 | 2006-10-04 | 徐州海伦哲工程机械有限公司 | Integrated control valve assembly for concrete injector |
| KR100859647B1 (en) * | 2007-04-23 | 2008-09-23 | 삼보건설기계 주식회사 | Pre-trimming device and method for pile head of cast-in-place concrete pile |
| CN201273312Y (en) * | 2008-10-14 | 2009-07-15 | 杭州专用汽车有限公司 | Special valve block for jib pump vehicle pumping integration |
| CN203097909U (en) * | 2013-01-27 | 2013-07-31 | 泰安华煤国宏工矿科技有限公司 | Integrated concrete spraying device |
| CN205047233U (en) * | 2015-07-06 | 2016-02-24 | 湖南五新隧道智能装备股份有限公司 | Concrete spraying vehicle's injection apparatus and concrete spraying vehicle |
| CN107939048A (en) * | 2017-12-29 | 2018-04-20 | 湖南鹏翔星通汽车有限公司 | Injection apparatus, nozzle assembly and concrete ejection car |
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