CN114856641A - Concrete wet spraying method - Google Patents
Concrete wet spraying method Download PDFInfo
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- CN114856641A CN114856641A CN202210673485.5A CN202210673485A CN114856641A CN 114856641 A CN114856641 A CN 114856641A CN 202210673485 A CN202210673485 A CN 202210673485A CN 114856641 A CN114856641 A CN 114856641A
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- 238000005507 spraying Methods 0.000 title claims abstract description 73
- 239000004567 concrete Substances 0.000 title claims abstract description 65
- 239000004576 sand Substances 0.000 claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 239000011435 rock Substances 0.000 claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 22
- 239000011378 shotcrete Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000005204 segregation Methods 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a concrete wet spraying method, which comprises the following steps of; installing a steel arch on a rock surface in the tunnel, cleaning the rock surface, and determining a placing position by a wet spraying machine; stirring and mixing cement, sand, stone and water according to a mixing ratio, and ensuring that the slump of the sprayed concrete to a wet spraying site is controlled to be 8-12 cm; and has good cohesiveness; after the water-cement ratio is determined according to the strength, the design of the mixing ratio of the sprayed concrete is mainly focused on the workability of the concrete, the slump of the sprayed concrete on a wet spraying site is controlled to be 8-12 cm, and the sprayed concrete has good cohesiveness. Prevent the mixed material from being too dry, too wet or segregation. According to the design requirements and the different types of supplied raw material sand, three wet-spraying concrete mixing ratios are obtained through indoor tests and field test spraying, so that the condition and the phenomenon of pipe blockage can be avoided.
Description
Technical Field
The invention relates to the technical field of concrete wet spraying, in particular to a concrete wet spraying method.
Background
The sprayed concrete is a construction method for pouring fine stone concrete by spraying a pressure spray gun. It is commonly used for pouring linings of tunnel, linings of thin-wall structures such as wall and ceiling, or linings of other structures, and protective layers of steel structures. The sprayed concrete is formed by filling cement, sand, stones, water and a certain amount of additives which are prepared in advance into a spraying machine, sending the mixture to a spray head by utilizing high-pressure air, mixing the mixture with an accelerating agent and spraying the mixture to the surface of the rock or the concrete at a high speed.
Concrete spraying machines are mechanical devices that spray concrete mixture directly onto building surfaces or structures to reinforce the building surfaces or form new structures.
The concrete sprayer is a core device in concrete spraying construction, mechanical devices matched with the concrete sprayer comprise a mechanical arm, an air compressor, a water supply system, a batching and stirring feeding device, an accelerator adding device and the like, the devices are combined through different equipment, various process flows can be realized, and the devices can be assembled into a whole to form a triple unit integrating material storage, stirring and spraying, so that the mechanization degree of the whole concrete spraying construction process is improved.
And the concrete sprayer has the following defects due to the unit design: many delivery pipe bends and limited pumping pressure. If the mixing ratio is not well controlled in the construction process, the pipe can be frequently blocked, and the productivity is influenced.
Disclosure of Invention
The present invention is directed to solving the above problems of the background art and to providing a wet spraying method for concrete.
The purpose of the invention can be realized by the following technical scheme:
a concrete wet spraying method comprises the following steps;
installing a steel arch on a rock surface in the tunnel, cleaning the rock surface, and determining a placing position by a wet spraying machine;
stirring and mixing cement, sand, stone and water according to a mixing ratio, and ensuring that the slump of the sprayed concrete to a wet spraying site is controlled to be 8-12 cm; and has good cohesiveness;
the cement is P.O 42.5.5R cementThe amount is 455-490 kg/m 3 ；
The sand is medium sand or machine-made sand with fineness modulus less than 3.5, and the using amount of the sand is 862-1084 kg/m 3 ；
The stones are small stones, and the dosage of the stones is 558-768 kg/m 3 ；
Underground water for water mining, wherein the water consumption is 200-218 kg/m 3 ；
The accelerator is a liquid accelerator, and the using amount of the accelerator is 15.925-19.600 kg/m 3 ；
Continuously and uniformly adding the mixed concrete into a hopper of a wet spraying machine, mixing the liquid setting accelerator, conveying the concrete in the hopper to a spray head through a conveying pump, mixing compressed air and the liquid setting accelerator in a mixer, then mixing the compressed air and the liquid setting accelerator in the mixer, and spraying the mixture from the spray head and the concrete at high pressure;
spraying the concrete on the surface of rock or concrete to finish primary spraying to fill the pits, wherein the primary spraying thickness is not less than 4cm, and wet-spraying the concrete after pit filling is finished until fine leveling is finished;
the spraying thickness is controlled by a stake marking method.
As a further scheme of the invention: the median fineness modulus was 2.8 or 2.6.
As a further scheme of the invention: the specification of the small stone is 5-10 mm.
As a further scheme of the invention: the preparation process of the organic sand comprises the following steps: the stone slag is crushed, screened, made into sand, cleaned and extracted to obtain the machine-made sand.
As a further scheme of the invention: in the material pretreatment, a jaw crusher, a cone crusher, a circular vibrating screen, a sand making machine, a vibrating screen, a sand washing machine and a fine sand extractor are respectively adopted for crushing, screening, cleaning and extracting.
As a further scheme of the invention: the pile marking method is characterized in that the exposed length of the anchor rod is used as a pile marking, and no pile marking head is exposed after concrete is sprayed. If the anchor rod is not arranged, drilling holes by using an electric drill to anchor iron nails or steel bar heads with the diameter of 6mm on the rock surface, wherein the exposed length of the steel bar heads is equal to the thickness of the designed sprayed concrete, about 1-2 steel bars are arranged per square meter, the steel bar heads are arranged in a quincunx manner, and no steel bar heads are exposed after the concrete is sprayed.
As a further scheme of the invention: the distance between the spray head and the rock surface is 0.8-1.2 m, and the distance between the spray head and the rock surface can be increased to 1.2-1.5 m at the upper part; the sprayed material beam is vertical to the sprayed surface and forms an included angle of 5-15 degrees with the vertical line of the sprayed surface.
As a further scheme of the invention: when spouting the steel bow member at first the rock face in the middle of the steel bow member that is furnished with the reinforcing bar net piece sprays and makes the end, the nozzle should be close to and receive the face of spouting, and there is a small angle with the vertical direction, make the concrete behind the reinforcing bar can spray more closely, prevent to leak behind the reinforcing bar and spout, in order to obtain better parcel effect, then side spraying steel bow member is back, the nozzle should be close to and receive the face of spouting, form about 75 jiaos with receiving the face of spouting, then in the middle of the injection steel bow member of layering again, the layering sprays until sweeping, the nozzle distance receives the face of spouting when shaving to sweep flat about 1.2m, and the translation rate of nozzle is fast and steady.
The invention has the beneficial effects that:
after the water-cement ratio is determined according to the strength, the design of the mixing ratio of the sprayed concrete is mainly focused on the workability of the concrete, the slump of the sprayed concrete on a wet spraying site is controlled to be 8-12 cm, and the sprayed concrete has good cohesiveness. Preventing the mixture from being too dry, too wet or segregation. According to the design requirements and the difference of the types of supplied raw material sand, three wet-spraying concrete mixing ratios are obtained through indoor tests and field test spraying, so that the condition and the phenomenon of pipe blockage can be avoided.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 shows the injection sequence in the primary branch of the tunnel;
fig. 2 is a trajectory of the spray beam.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In a first embodiment, referring to fig. 1-2, the present invention is a wet spraying method for concrete, comprising the following steps;
installing a steel arch on a rock surface in the tunnel, cleaning the rock surface, and determining a placing position by a wet spraying machine;
stirring and mixing cement, sand, stone and water according to a mixing ratio, and ensuring that the slump of the sprayed concrete to a wet spraying site is controlled to be 8-12 cm; and has good cohesiveness;
P.O 42.5.5R cement is adopted as the cement, and the dosage of the cement is 455-490 kg/m 3 ；
The sand is medium sand or machine-made sand with fineness modulus less than 3.5, and the using amount of the sand is 862-1084 kg/m 3 ；
Wherein the fineness modulus of the medium sand is 2.8 or 2.6;
wherein, the preparation process of the organic sand comprises the following steps: the stone slag is crushed, screened, made into sand, cleaned and extracted to obtain the machine-made sand, and the crushing, screening, cleaning and extraction in the material pretreatment respectively adopt a jaw crusher, a cone crusher, a circular vibrating screen, a sand making machine, a vibrating screen, a sand washing machine and a fine sand extractor.
The stones are small stones, and the dosage of the stones is 558-768 kg/m 3 ；
Wherein the specification of the small stone is 5-10 mm;
underground water for water mining, wherein the water consumption is 200-218 kg/m 3 ；
The accelerator is a liquid accelerator, and the using amount of the accelerator is 15.925-19.600 kg/m 3 ；
Continuously and uniformly adding the mixed concrete into a hopper of a wet spraying machine, mixing the liquid setting accelerator, conveying the concrete in the hopper to a spray head through a conveying pump, mixing compressed air and the liquid setting accelerator in a mixer, then mixing the compressed air and the liquid setting accelerator in the mixer, and spraying the mixture from the spray head and the concrete at high pressure;
spraying the concrete on the surface of rock or concrete to finish primary spraying to fill the pits, wherein the primary spraying thickness is not less than 4cm, and wet-spraying the concrete after pit filling is finished until fine leveling is finished;
when the steel arch is sprayed, firstly, spraying and bottoming are carried out on a rock surface in the middle of the steel arch provided with the reinforcing steel mesh, a nozzle is close to a sprayed surface and has a small angle with the vertical direction, so that concrete behind reinforcing steel can be sprayed more compactly, the phenomenon of leaking behind the reinforcing steel is prevented, a good wrapping effect is obtained, then, side spraying is carried out on the back of the steel arch, the nozzle is close to the sprayed surface and forms an angle of about 75 degrees with the sprayed surface, then, the middle of the layered sprayed steel arch is sprayed until the steel arch is swept, when the surface is repaired, the distance between the nozzle and the sprayed surface is about 1.2m, the nozzle is swept, and the moving speed of the nozzle is high and stable;
the spraying thickness is controlled by a stake marking method.
The injection operation control points of the CIFA-CSS3 concrete injection machine are as follows:
adjusting working wind pressure: generally, the pressure is between 0.4 and 0.5 MPa. And adjusting the working air pressure in time according to the change of the sprayed concrete part, the distance and the slump of the sprayed mixture. The too big wind pressure can increase the resilience and even blow off the concrete which is not completely solidified; the air pressure is small, the coarse aggregate cannot fall off due to not entering a mortar layer, the quality of sprayed concrete is influenced, and pipe blockage can be caused even when the air pressure is too small; the wind pressure is controlled on site by taking the degree of small rebound quantity, glossy surface and easy adhesion of sprayed concrete as the degree.
And (3) feeding control: when spraying is carried out, continuous feeding is needed, the hopper is always kept full of material, and when the material is not supplied, the amount of the material in the storage bin is controlled during spraying, and the material in the storage bin is always ensured to be 60 percent of the storage bin; the hopper is provided with a screen with the aperture of 15mm, so that the phenomenon that the oversize aggregate enters the machine to cause pipe blockage is avoided.
And (3) spraying sequence: the spraying operation should be carried out in a segmentation and fragmentation sequence from bottom to top, the length of each segment should not exceed 6m, and the spraying sequence in the initial support of the tunnel is carried out according to the sequence of wall first and then arch (the arch part starts from the arch springing, and the side wall starts from the corner), as shown in figure 1.
The motion trail of the sprayed material beam is as follows: the circular rotation moves horizontally and is pressed for half a circle, and the diameter of the circular rotation is about 0.3-0.4 m. When spraying the 2 nd line, the overlapping of the lines is 2-3 cm from the upper part of the starting point of the first line in sequence, as shown in figure 2.
Optimum spray distance and angle: when the nozzle is too close to the sprayed surface, the compressed air blows away the concrete mixture which is just adhered to the sprayed surface, so that the resilience of the coarse aggregate is increased. The spraying condition shows that the distance between the spray head and the rock surface is 0.8-1.2 m, and the distance between the spray head and the rock surface can be properly increased to 1.2-1.5 m at the upper part; the sprayed material beam is basically vertical to the sprayed surface and forms an optimal included angle of 5-15 degrees with the vertical line of the sprayed surface. If the sprayed surface is covered by the grid and the reinforcing mesh, the spray head can be slightly deflected, but is not smaller than 70 degrees. If the angle between the spray head and the sprayed surface is too small, the concrete material can roll on the working surface, the uneven wavy sprayed surface appears, the rebound quantity is increased, and the quality of the sprayed concrete is influenced. In the section provided with the blind pipe, the blind pipe is required to be sprayed over, so that a water permeable gap is formed behind the blind pipe. When the rock face that is furnished with the reinforcing bar net piece sprays, the nozzle should be close to and receive the face of spouting to there is a small angle with the vertical direction, make the concrete behind the reinforcing bar can spray more closely knit, prevent to leak behind the reinforcing bar and spout, in order to obtain better parcel effect.
Primary spraying thickness: the initial spraying thickness is not less than 4cm according to the design thickness and the spraying position. When the first layer is sprayed with concrete, the filling and the filling are emphasized, and the small pits are sprayed circularly and smoothly.
Controlling the thickness of sprayed concrete: the spraying thickness is controlled by a stake marking method. When the anchor rod is installed, the exposed length of the anchor rod is used as a stake. If the anchor rod is not arranged, drilling holes by using an electric drill to anchor iron nails or steel bar heads with the diameter of 6mm on the rock surface, wherein the exposed length of the steel bar heads is equal to the thickness of the designed sprayed concrete, about 1-2 steel bars are arranged per square meter, the steel bar heads are arranged in a quincunx manner, and no steel bar heads are exposed after the concrete is sprayed.
Controlling the flatness of sprayed concrete: the surface flatness is smooth for visual inspection, otherwise, the spraying needs to be supplemented.
Selecting sand and broken stone with hard texture and good gradation. The fineness modulus of the sand is between 2.6 and 2.9, the mud content is less than 3 percent, and other technical indexes meet the regulation of building sand (GB/T14684-2001); the gravel has continuous gradation with the grain diameter range of 4.75-9.5 mm, the mud content is less than 1 percent, and other technical indexes meet the regulations of pebbles and gravel for buildings (GB/T14685-2001).
Main parameters of sand material for wet spraying concrete
| Type (B) | Modulus of fineness | Content of sludge (or powder content)/%) |
| Guangning sand | 2.8 | 1 |
| Local sand | 2.6 | 2.23 |
| Machine-made sand | 3.5 | 1.5 |
Cement: the strength grade of the selected ordinary Portland cement is 42.5MPa, and each performance index of the selected ordinary Portland cement meets the regulation of the general Portland cement Standard (GB 175-2007).
Liquid accelerator: the alkali-free setting accelerator is selected, the initial setting time of the alkali-free setting accelerator and cement paste is less than or equal to 5min, and the final setting time is less than or equal to 10min when the alkali-free setting accelerator meets the standard mixing amount.
In the second embodiment, the following concrete mixing ratio is obtained based on the first embodiment. (wherein the sand is local river sand)
It is noted here that the local river sand is the river sand in Qingyuan city, Guangdong province.
In the third embodiment, the following concrete mixing ratio is obtained based on the first embodiment. (wherein the sand is Guangning river sand)
In the fourth embodiment, the following concrete mixing ratio is obtained based on the first embodiment. (wherein, the sand is machine-made sand)
It should be noted that: after being extracted by a fine sand extractor, the fineness modulus of the machine-made sand is less than 3.5; for special engineering geological conditions, the mixing proportion needs to be reasonably adjusted.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A concrete wet spraying method is characterized by comprising the following steps;
installing a steel arch on a rock surface in the tunnel, cleaning the rock surface, and determining a placing position by a wet spraying machine;
stirring and mixing cement, sand, stone and water according to a mixing ratio, and ensuring that the slump of the sprayed concrete to a wet spraying site is controlled to be 8-12 cm;
P.O 42.5.5R cement is adopted as the cement, and the dosage of the cement is 455-490 kg/m 3 ；
The sand is medium sand or machine-made sand with fineness modulus less than 3.5, and the using amount of the sand is 862-1084 kg/m 3 ；
The stones are small stones, and the dosage of the stones is 558-768 kg/m 3 ；
Underground water for water mining, wherein the water consumption is 200-218 kg/m 3 ；
The accelerator is a liquid accelerator, and the using amount of the accelerator is 15.925-19.600 kg/m 3 ；
Continuously and uniformly adding the mixed concrete into a hopper of a wet spraying machine, mixing the liquid setting accelerator, conveying the concrete in the hopper to a spray head through a conveying pump, mixing compressed air and the liquid setting accelerator in a mixer, then mixing the compressed air and the liquid setting accelerator in the mixer, and spraying the mixture from the spray head and the concrete at high pressure;
spraying the concrete on the surface of rock or concrete to finish primary spraying to fill the pits, wherein the primary spraying thickness is not less than 4cm, and wet-spraying the concrete after pit filling is finished until fine leveling is finished;
the spraying thickness is controlled by a stake marking method.
2. The concrete wet-spraying method as claimed in claim 1, wherein the medium sand fineness modulus is 2.8 or 2.6.
3. The wet shotcreting method of claim 1, wherein the small stones have a size of 5-10 mm.
4. The wet shotcreting method of claim 1, wherein the organic sand is prepared by: the stone slag is crushed, screened, made into sand, cleaned and extracted to obtain the machine-made sand.
5. The concrete wet blasting method of claim 4, wherein the crushing, screening, washing and extracting in the material pretreatment are respectively a jaw crusher, a cone crusher, a circular vibrating screen, a sand making machine, a vibrating screen, a sand washing machine and a fine sand extracting machine.
6. The concrete wet-spraying method according to claim 1, wherein the pile marking method is to use the exposed length of the anchor rod as a pile marking, and no pile marking head is exposed after the concrete is sprayed.
7. The concrete wet spraying method according to claim 1, wherein the distance between the spray head and the rock surface is 0.8-1.2 m; the sprayed material beam is vertical to the sprayed surface and forms an included angle of 5-15 degrees with the vertical line of the sprayed surface.
8. The concrete wet spraying method of claim 1, wherein the steel arch is sprayed by spraying to bottom the rock surface in the middle of the steel arch with the steel mesh, the nozzle is close to the sprayed surface to enable the concrete behind the steel bar to be sprayed more densely, so as to prevent the concrete behind the steel bar from leaking and spraying to obtain better wrapping effect, then the nozzle is sprayed to the back of the steel arch on the side and close to the sprayed surface to form an angle of about 75 degrees with the sprayed surface, then the concrete is sprayed to the middle of the steel arch in layers and is sprayed until the concrete is leveled, and the nozzle is leveled when the distance between the nozzle and the sprayed surface is 1.2m during face repairing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673485.5A CN114856641A (en) | 2022-06-14 | 2022-06-14 | Concrete wet spraying method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673485.5A CN114856641A (en) | 2022-06-14 | 2022-06-14 | Concrete wet spraying method |
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| Publication Number | Publication Date |
|---|---|
| CN114856641A true CN114856641A (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210673485.5A Pending CN114856641A (en) | 2022-06-14 | 2022-06-14 | Concrete wet spraying method |
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| CN (1) | CN114856641A (en) |
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- 2022-06-14 CN CN202210673485.5A patent/CN114856641A/en active Pending
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