CN110566234A - Wet-process concrete spraying pneumatic spraying method - Google Patents
Wet-process concrete spraying pneumatic spraying method Download PDFInfo
- Publication number
- CN110566234A CN110566234A CN201910907479.XA CN201910907479A CN110566234A CN 110566234 A CN110566234 A CN 110566234A CN 201910907479 A CN201910907479 A CN 201910907479A CN 110566234 A CN110566234 A CN 110566234A
- Authority
- CN
- China
- Prior art keywords
- mixing
- concrete
- wet
- atomized
- cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 83
- 238000005507 spraying Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 75
- 239000000203 mixture Substances 0.000 claims abstract description 75
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 239000004568 cement Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000011378 shotcrete Substances 0.000 claims abstract description 30
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000004575 stone Substances 0.000 claims abstract description 8
- 238000000889 atomisation Methods 0.000 claims description 26
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 238000005422 blasting Methods 0.000 claims description 5
- 235000010627 Phaseolus vulgaris Nutrition 0.000 claims description 3
- 244000046052 Phaseolus vulgaris Species 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims 3
- 238000010276 construction Methods 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 9
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 235000021251 pulses Nutrition 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
-
- 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a wet-process shotcrete pneumatic ejection method, which comprises the steps of adding cement, sand, pea stone, an admixture and water into a mixer to prepare a fluid concrete mixture, wherein the cement accounts for 21-29% of the total materials; and carrying out rotational flow treatment on the atomized setting accelerator in a spray nozzle, and then, carrying out rotary mixing on the atomized setting accelerator and the prepared fluid concrete mixture, and then, quickly spraying the atomized setting accelerator to a part to be constructed. The method can greatly improve the utilization rate and the quick-setting effect of the quick-setting agent, reduce the rebound quantity of the sprayed concrete and effectively improve the strength of the sprayed concrete; the phenomena of pipe blockage and pulse dripping leakage of the concrete mixture during the injection construction are avoided.
Description
Technical Field
The invention belongs to the technical field of concrete spraying construction, and particularly relates to a wet-process concrete spraying pneumatic spraying method.
Background
The concrete spraying construction has been widely applied to the rock roadway support of building foundation pits, subways, slope protection, highways, high-speed railway tunnels and mine engineering after decades of development. The sprayed concrete is a concrete construction method which is characterized in that concrete mixed according to a certain mixing ratio is added with an accelerating agent by means of a spraying machine by utilizing compressed air or other power, and then is sprayed onto a sprayed rock surface and a structure at a high speed under the action of high-pressure air through a delivery hose, and can be rapidly coagulated and hardened.
No matter the present concrete sprays construction uses large-scale platform truck or small-size wet blasting machine all has concrete to spray stifled pipe, ejection of compact pulse water clock and construction concrete resilience volume a great deal of problem such as big, has seriously influenced shotcrete construction, and the most fundamental is: the existing wet shotcrete technology greatly influences the utilization rate of the accelerator and the accelerating effect of the accelerator.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wet-process sprayed concrete pneumatic spraying method aiming at the defects in the prior art, the uniform mixing of the accelerator and the concrete mixture is realized through cyclone assistance, the accelerator effect on cement is improved, the phenomena of pipe blocking adhesion and pulse dripping leakage in concrete construction are avoided, and the concrete rebound amount in spraying construction is greatly reduced.
the invention adopts the following technical scheme:
A wet-process shotcrete pneumatic ejection method comprises the following steps:
s1, adding cement, sand, pea stone, an admixture and water into a stirrer to prepare a fluid concrete mixture, wherein the cement accounts for 21-29% of the total material mass, and the mass ratio of the cement: sand: and (3) bean stones: blending materials: the mass ratio of water is 1: (1.1-2.0): (1.0-1.3): (0.005-0.015): (0.35-0.50);
And S2, carrying out rotational flow treatment on the atomized setting accelerator in a spray nozzle, and then, carrying out rotary mixing on the atomized setting accelerator and the fluid concrete mixture prepared in the step S1, and then, quickly spraying the mixture to a part to be constructed.
specifically, the spray nozzle comprises a mixing pipeline and a discharge pipeline, wherein one end of the mixing pipeline is connected with one end of a concrete conveying pipeline; the other end is connected with the one end of ejection of compact pipeline, sets up at least a set of area wind atomization accelerating agent interface on the lateral wall of hybrid line, and every group area wind atomization accelerating agent interface includes two rows of area wind atomization accelerating agent interfaces, and every row of area wind atomization accelerating agent interface includes the interface of a plurality of interval arrangement.
Further, the concrete mixture is 5-28 m3the velocity of/h is fed into the mixing duct.
Further, introducing 0.4-0.8 Mpa of rotating air with an atomized accelerating agent along the tangential or normal direction of the side wall of the mixing pipeline; and introducing 0.4-0.8 Mpa of rotary wind pressure along the tangential line or normal direction of the side wall of the mixing pipeline.
Furthermore, the two rows of interfaces with the air atomization setting accelerators are symmetrically arranged.
Furthermore, each interface is arranged along the tangential line or the normal direction of the side wall of the mixing pipeline, and an inclination angle of 30-90 degrees is arranged between the opening direction of the interface and the axial direction of the mixing pipeline.
furthermore, the diameter of the interface is 10-50 mm.
Further, the length of the mixing pipeline is 10-90 cm, and the diameter of the mixing pipeline is 30-80 mm; .
Furthermore, one end of the discharge pipeline is a conical pipe opening, the length of the discharge pipeline is 50-100 cm, and the diameter of the discharge pipeline is 30-80 mm.
Specifically, according to the percentage of the cement dosage, the water reducing agent is 0.5-1.5 percent, and the air entraining agent is 0.005-0.02 percent.
compared with the prior art, the invention has at least the following beneficial effects:
The invention relates to a wet-process concrete spraying pneumatic spraying method. The concrete mixture is produced in a mixing plant by cement, sand, pea, admixture and water in different proportions. When the flow-state concrete mixture reaches the mixing pipeline through the pumping conveying pipeline and is mixed with the atomization accelerator, the atomization accelerator is subjected to rotational flow treatment, and the quick setting effect of the accelerator can be greatly exerted. Because the concrete mixture is a viscous fluid, however, the problems of pipe blockage, dripping leakage or poor quick setting effect and the like are easily caused by adding the direct current wind of the quick-setting agent with the pressure of 0.4-0.8 mpa according to the design mode of the existing spray head. Therefore, the power wind containing the accelerating agent or the wind added again enters in a tangential line or normal line direction in a rotating mode, and the problems easily occurring in the existing spraying construction can be solved. The concrete method is that the air atomization setting accelerator enters the inner cavity of the mixing pipeline along the inner wall of the mixing pipeline through the interface in a beveling way and is mixed along the flowing direction of the concrete, and then the air atomization setting accelerator is provided with higher spraying pressure, so that the setting accelerator and the concrete can be fully mixed, the utilization rate of the setting accelerator is improved, the action efficiency of the concrete and the atomization setting accelerator is high, the rebound of the sprayed concrete is reduced, and the strength of the sprayed concrete is effectively improved; the phenomena of pipe blockage and pulse dripping during injection construction of concrete mixture added with the accelerator are avoided; compared with the traditional jacket type spray head, the spray head with the mixing pipeline with the special structure has the advantages that the rebound is reduced by more than 50 percent under the same condition, the using amount of the accelerator is reduced by more than 1/3, the phenomenon of pipe blockage or dripping leakage is completely avoided, and the occurrence frequency is zero.
Furthermore, the connector is arranged along the tangent line or the normal line of the side wall of the mixer, and can provide wind power for rotating and stirring the concrete added with the accelerating agent in the mixer, thereby achieving the purposes of accelerating setting, reducing resilience and preventing the dripping and leakage of the anti-blocking pipe.
Furthermore, according to the characteristics of a wet spraying machine and a concrete mixture, in order to ensure construction safety and engineering quality, the wind pressure is set to be optimal between 0.4 and 0.8Mpa, and the power wind rotates to fully mix the accelerator and prevent the accelerator from being added to cause wall sticking and pipe blocking of concrete, dripping leakage or poor accelerator effect and other series problems.
Furthermore, the opening angle of the interface is set to be 30-90 degrees, and the concrete added with the accelerator is stirred and mixed to the maximum extent through a plurality of pneumatic cuts at different angles.
In conclusion, the method disclosed by the invention can greatly improve the utilization rate and the quick-setting effect of the quick-setting agent, reduce the rebound quantity of the sprayed concrete and effectively improve the strength of the sprayed concrete; the phenomena of pipe blockage and pulse dripping leakage of the concrete mixture during the injection construction are avoided.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a structural view of a conventional spray nozzle used in a construction site;
FIG. 2 is a structural view of another conventional spray nozzle used in a construction site;
FIG. 3 is a view showing a head structure for the ejection method of the present invention;
FIG. 4 is another head configuration for the ejection method of the present invention.
Detailed Description
At present, in the shotcrete construction, concrete mixture proportion, injection square amount and wind pressure all play decisive action to construction quality. The most key problem is the treatment method when the pneumatic rotational flow is sprayed out when the pumped sprayed concrete or the pneumatic sprayed concrete is intersected with the pneumatic force added with the accelerator.
the invention discloses a wet-process sprayed concrete pneumatic spraying method, which comprises the following steps:
S1, adding cement, sand, pea stone, an admixture and water into a stirrer to prepare a fluid concrete mixture, wherein the cement accounts for 21-29% of the total mass of the materials;
Cement: sand: and (3) bean stones: water: the mass ratio of the admixture is 1 (1.1-2.0): (1.0-1.3): 0.35-0.50): 0.005-0.015); the admixture is prepared according to the proportion of cement: 0.5 to 1.5 percent of water reducing agent and 0.005 to 0.02 percent of air entraining agent.
and S2, carrying out rotational flow treatment on the atomized setting accelerator in a spray nozzle, and then, carrying out rotary mixing on the atomized setting accelerator and the fluid concrete mixture prepared in the step S1, and then, quickly spraying the mixture to a part to be constructed.
The specific using process is as follows:
the wet spraying machine conveys the fluid concrete mixture to a spray head through a conveying hose; after the atomized setting accelerator is subjected to cyclone treatment by the spray nozzle, the flowing mode of the atomized setting accelerator is changed to enable the atomized setting accelerator to generate airflow stirring with the fluid concrete mixture, so that sufficient reaction mixing is achieved, the utilization rate of the setting accelerator is improved, the setting accelerating effect of the setting accelerator is enhanced, and meanwhile, the cohesion among the concrete mixtures is improved; through rotatory wind helping hand for smooth blowout of concrete reduces the resilience of shotcrete, the stifled pipe and the pulse water clock phenomenon that appear in the concrete construction.
Referring to fig. 3 and 4, the nozzle for wet shotcrete pneumatic spraying method according to the present invention includes a mixing pipe and a discharging pipe, wherein one end of the mixing pipe is connected to one end of the concrete feeding pipe; the other end is connected with one end of the discharge pipeline. At least one group of interfaces with the wind atomization setting accelerator is arranged on the side wall of the mixing pipeline, and each group of interfaces with the wind atomization setting accelerator preferably has two symmetrical interfaces. And a plurality of groups of wind-driven stirring interfaces can be connected.
preferably, each interface is arranged in a tangential or normal direction to the side wall of the mixing duct.
Preferably, an included angle is formed between the opening direction of each connector and the axial direction of the mixing pipeline and ranges from 30 degrees to 90 degrees.
Preferably, the diameter of the interface is 10-50 mm.
Preferably, the length of the mixing pipeline is 10-90 cm, and the diameter of the mixing pipeline is 30-80 mm.
preferably, one end of the discharging pipeline is a conical pipe opening, the length of the discharging pipeline is 50-100 cm, and the diameter of the discharging pipeline is 30-80 mm.
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a conventional spray nozzle used in a construction site is shown, and the specific construction process is as follows:
S1, adding cement, sand, pea stone, an admixture and water into a stirrer to prepare a fluid concrete mixture, wherein the cement accounts for 29% of the total material;
S2 concrete mixture28m3The mixed solution is conveyed to a mixed flow pipeline at a speed of/h, mixed with an atomization accelerating agent, and sprayed to a sprayed surface through a discharge pipeline.
The method shown in fig. 2 is: the atomization accelerating agent is added by using the traditional shower way, and then high-pressure air is introduced through a plurality of tangential or normal air inlets to intensively and rotatably stir and spray the concrete mixture,
Example 1
S1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 2.0: 1.3: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.005 percent, and the cement accounts for 21 percent of the total material;
S2 concrete mixture with a thickness of 21m3The flow is delivered to a mixed flow pipeline at a speed of/h, and is mixed with an atomization accelerating agent and then delivered to the mixed pipeline.
S3, introducing 0.4Mpa rotary wind pressure along the tangent line or normal direction of the side wall of the mixing pipeline, fully disturbing the concrete mixture, and spraying the mixture to the sprayed surface through the discharge pipeline.
Example 2
S1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 1.4: 1.1: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.008 percent, and the cement accounts for 25 percent of the total material;
S2 concrete mixture 18m3The flow is delivered to a mixed flow pipeline at a speed of/h, and is mixed with an atomization accelerating agent and then delivered to the mixed pipeline.
S3, introducing 0.6Mpa rotary wind pressure along the tangent line or normal direction of the side wall of the mixing pipeline, fully disturbing the concrete mixture, and spraying the mixture to the sprayed surface through the discharge pipeline.
Example 3
S1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 1.1: 1.0: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.009 percent, and the cement accounts for 29 percent of the total materials;
S2 concrete mixture with a grain size of 28m3transport at a speed of hThe mixture is mixed with an atomization accelerating agent and then is conveyed into a mixing pipeline.
S3, introducing 0.8Mpa rotary wind pressure along the tangent line or normal direction of the side wall of the mixing pipeline, fully disturbing the concrete mixture, and spraying the mixture to the sprayed surface through the discharge pipeline.
The side wall of the mixer at the front end of the spray nozzle is provided with a plurality of rows of air-carrying atomization accelerating agent interfaces which are arranged along the tangential line or the normal direction of the side wall of the mixer. The wind atomization setting accelerator can be rotated and enter along the tangential line or normal direction of the side wall, and is fully mixed with concrete mixture and sprayed out, and the structure is shown in figure 3.
Example 4
s1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 2.0: 1.3: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.006 percent, and the cement accounts for 21 percent of the total material;
S2 concrete mixture with a thickness of 15m3The/h rate is fed into the mixing line.
S3, introducing 0.4Mpa of rotating air with atomized setting accelerators along the tangential line or normal direction of the side wall of the mixing pipeline, fully disturbing the mixing pipeline and the concrete mixture, and spraying the mixture to the sprayed surface through a discharge pipeline.
Example 5
S1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 1.4: 1.1: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.007 percent, and the cement accounts for 25 percent of the total material;
S2 concrete mixture of 5m3The/h rate is fed into the mixing line.
S3, introducing 0.6Mpa rotary air with atomized setting accelerator along the tangent or normal direction of the side wall of the mixing pipeline, fully disturbing the rotary air and the concrete mixture in the mixing pipeline, and spraying the rotary air to the sprayed surface through the discharge pipeline.
Example 6
s1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 1.1: 1.0: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.010 percent, and the cement accounts for 29 percent of the total material;
S2 concrete mixture of 10m3the/h rate is fed into the mixing line.
S3, introducing 0.8Mpa rotary air with atomized setting accelerator along the tangent or normal direction of the side wall of the mixing pipeline, fully disturbing the rotary air and the concrete mixture in the mixing pipeline, and spraying the rotary air to the sprayed surface through the discharge pipeline.
The side wall of the mixer at the front end of the spray nozzle is provided with a plurality of rows of air-carrying atomization setting accelerator interfaces and air inlets, and the air-carrying atomization setting accelerator interfaces and the air inlets are arranged along the tangential line or the normal direction of the side wall of the mixer. The wind atomization setting accelerator can be made to rotate and enter along the tangential line or normal direction of the side wall, and is fully mixed with concrete mixture. And then the concrete mixture is subjected to secondary strong disturbance through high-pressure airflow which is connected into a plurality of tangential or normal air inlets, and then is sprayed out in a rotating mode, as shown in figure 4.
Example 7
S1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 2.0: 1.3: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.006 percent, and the cement accounts for 21 percent of the total material;
S2 concrete mixture with a thickness of 21m3The/h rate is fed into the mixing line.
S3 introducing 0.4Mpa rotary air with atomized accelerating agent along the tangent or normal direction of the side wall of the mixing pipe, and mixing with the concrete mixture in the mixing pipe.
S4, introducing 0.4Mpa rotary wind pressure along the tangent line or normal direction of the side wall of the mixing pipeline, and spraying the concrete mixture to the sprayed surface through the discharge pipeline after secondary disturbance.
Example 8
s1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 1.4: 1.1: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.008 percent, and the cement accounts for 25 percent of the total material;
S2 concrete mixture with 25m3The/h rate is fed into the mixing line.
S3 introducing 0.4Mpa rotary air with atomized accelerating agent along the tangent or normal direction of the side wall of the mixing pipe, and mixing with the concrete mixture in the mixing pipe.
s4, introducing 0.6Mpa rotary wind pressure along the tangent line or normal direction of the side wall of the mixing pipeline, and spraying the concrete mixture to the sprayed surface through the discharge pipeline after secondary disturbance.
Example 9
S1 mixing cement, sand, pea, admixtures and water in a ratio of 1: 1.1: 1.0: 0.005: 0.40 to 0.50 percent of the mixture is added into a stirrer to prepare a fluid concrete mixture, the water reducing agent accounts for 0.5 percent, the air entraining agent accounts for 0.009 percent, and the cement accounts for 29 percent of the total materials;
S2 concrete mixture with a grain size of 28m3The/h rate is fed into the mixing line.
S3 introducing 0.4Mpa rotary air with atomized accelerating agent along the tangent or normal direction of the side wall of the mixing pipe, and mixing with the concrete mixture in the mixing pipe.
S4, introducing 0.8Mpa rotary wind pressure along the tangent line or normal direction of the side wall of the mixing pipeline, and spraying the concrete mixture to the sprayed surface through the discharge pipeline after secondary disturbance.
TABLE 1 comparison of the effects of the wet shotcrete pneumatic blasting method
The probability of pipe blockage exceeds 20 percent, and the pipe is considered to be easy to block. The probability of pipe blockage is lower than 3%, and the pipe is not easy to block.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A wet-process shotcrete pneumatic ejection method is characterized by comprising the following steps:
S1, adding cement, sand, pea stone, an admixture and water into a stirrer to prepare a fluid concrete mixture, wherein the cement accounts for 21-29% of the total material mass, and the mass ratio of the cement: sand: and (3) bean stones: blending materials: the mass ratio of water is 1: (1.1-2.0): (1.0-1.3): (0.005-0.015): (0.35-0.50);
And S2, carrying out rotational flow treatment on the atomized setting accelerator in a spray nozzle, and then, carrying out rotary mixing on the atomized setting accelerator and the fluid concrete mixture prepared in the step S1, and then, quickly spraying the mixture to a part to be constructed.
2. The wet shotcrete pneumatic blasting method of claim 1, wherein the shotcrete head includes a mixing pipe and a discharge pipe, one end of the mixing pipe being connected to one end of the concrete delivery pipe; the other end is connected with the one end of ejection of compact pipeline, sets up at least a set of area wind atomization accelerating agent interface on the lateral wall of hybrid line, and every group area wind atomization accelerating agent interface includes two rows of area wind atomization accelerating agent interfaces, and every row of area wind atomization accelerating agent interface includes the interface of a plurality of interval arrangement.
3. the wet shotcrete air-blast method as claimed in claim 2, wherein the concrete mix is mixed at a volume of 5-28 m3the velocity of/h is fed into the mixing duct.
4. The wet shotcrete pneumatic jetting method of claim 2, wherein 0.4-0.8 Mpa of rotating air with an atomized accelerating agent is blown in along a tangential or normal direction of a side wall of the mixing pipe; and introducing 0.4-0.8 Mpa of rotary wind pressure along the tangential line or normal direction of the side wall of the mixing pipeline.
5. The wet shotcrete aerodynamic blowing method of claim 2, wherein the two rows of air atomized setting accelerator interfaces are arranged symmetrically.
6. the wet shotcrete aerodynamic blowing method of claim 2, wherein each joint is arranged in a tangential or normal direction of a side wall of the mixing duct, and an inclination angle of 30 ° to 90 ° is provided between an opening direction of the joint and an axial direction of the mixing duct.
7. The wet shotcrete air blasting method of claim 2, wherein the diameter of the nozzle is 10 to 50 mm.
8. The wet shotcrete air-blast method as claimed in claim 2, wherein the mixing duct has a length of 10 to 90cm and a diameter of 30 to 80 mm.
9. The wet shotcrete pneumatic blasting method of claim 2, wherein the discharge duct has a tapered nozzle at one end, a length of 50 to 100cm, and a diameter of 30 to 80 mm.
10. The wet shotcrete aerodynamic blowing method according to claim 1, wherein the admixture comprises, in terms of cement content, 0.5% to 1.5% of a water reducing agent and 0.005% to 0.02% of an air entraining agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910907479.XA CN110566234A (en) | 2019-09-24 | 2019-09-24 | Wet-process concrete spraying pneumatic spraying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910907479.XA CN110566234A (en) | 2019-09-24 | 2019-09-24 | Wet-process concrete spraying pneumatic spraying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110566234A true CN110566234A (en) | 2019-12-13 |
Family
ID=68782089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910907479.XA Pending CN110566234A (en) | 2019-09-24 | 2019-09-24 | Wet-process concrete spraying pneumatic spraying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110566234A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113858468A (en) * | 2021-10-09 | 2021-12-31 | 浙江宏达包装科技股份有限公司 | Feeding barrel for producing stretch-resistant and puncture-resistant winding film |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122234A (en) * | 2007-08-14 | 2008-02-13 | 陕西金石混凝土科技发展有限公司 | Construction method for using liquid quick coagulator for injecting concrete |
| CN202241560U (en) * | 2011-09-21 | 2012-05-30 | 中铁岩锋成都科技有限公司 | Atomization device for liquid accelerating agent |
| AU2013100296A4 (en) * | 2013-03-12 | 2013-04-18 | M.L.C. & Co Pty Ltd | Tunnel lining apparatus |
| CN106541496A (en) * | 2016-11-24 | 2017-03-29 | 陕西金石混凝土科技发展有限公司 | A kind of pneumatic aquation of dry concrete and accelerator mixed method and injection shower nozzle |
-
2019
- 2019-09-24 CN CN201910907479.XA patent/CN110566234A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122234A (en) * | 2007-08-14 | 2008-02-13 | 陕西金石混凝土科技发展有限公司 | Construction method for using liquid quick coagulator for injecting concrete |
| CN202241560U (en) * | 2011-09-21 | 2012-05-30 | 中铁岩锋成都科技有限公司 | Atomization device for liquid accelerating agent |
| AU2013100296A4 (en) * | 2013-03-12 | 2013-04-18 | M.L.C. & Co Pty Ltd | Tunnel lining apparatus |
| CN106541496A (en) * | 2016-11-24 | 2017-03-29 | 陕西金石混凝土科技发展有限公司 | A kind of pneumatic aquation of dry concrete and accelerator mixed method and injection shower nozzle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113858468A (en) * | 2021-10-09 | 2021-12-31 | 浙江宏达包装科技股份有限公司 | Feeding barrel for producing stretch-resistant and puncture-resistant winding film |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2011310100B2 (en) | Mixing apparatus for pumpable mixtures and method related thereto | |
| CN107417204A (en) | It is a kind of can 3D printing CHARACTERISTICS OF TAILINGS SAND fiber concrete and its preparation, application method | |
| CN210545794U (en) | Pneumatic stirring and mixing device for concrete spraying nozzle | |
| CN207983681U (en) | A kind of dry gunite concrete slurry helical feed agitating device | |
| CN106541496A (en) | A kind of pneumatic aquation of dry concrete and accelerator mixed method and injection shower nozzle | |
| CN110566234A (en) | Wet-process concrete spraying pneumatic spraying method | |
| CN206199545U (en) | A kind of concrete ejection shower nozzle | |
| CN103643969B (en) | A kind of colliery wet shot system of high strength low power consuming and wet shot method | |
| CN207554072U (en) | Coal mine air cement slurries spraying equipment | |
| KR100989428B1 (en) | The structure repair method of construction for which mortar, this injection equipment and this were used | |
| CN206897686U (en) | A kind of eddy flow wind system for rotor-piston type concrete injection machine | |
| CN87210829U (en) | Spiral sprayer for concrete | |
| CN211303466U (en) | Spray head for spraying concrete | |
| CN206143761U (en) | Sand device is mixed in cement stirring stake | |
| CN115897547A (en) | Construction equipment for forming waste slurry and residue soil into liquid solidified soil | |
| CN213913622U (en) | Tailing micro-powder activation stirring device | |
| CN107893668A (en) | Colliery air cement slurries spraying equipment and air cement slurries spraying method | |
| CN211736409U (en) | Novel spray nozzle structure of concrete spraying device | |
| CN204299588U (en) | From the wet concrete sprayer stirred | |
| RU2109629C1 (en) | Method of preparation of cellular building mixes based on gypsum-containing mineral binder and device for its realization | |
| CN201560770U (en) | Guniting equipment | |
| CN101737065A (en) | Slurry spraying equipment | |
| CN206415242U (en) | A kind of concrete sprayer shower nozzle | |
| CN211725449U (en) | Accelerator premix device | |
| CN2444059Y (en) | Rator type concrete wet blasting machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |