Spraying material for repairing and reinforcing trenchless underground drainage pipe net cage culvert and preparation method of spraying material

Abstract

The invention discloses a spraying material for repairing and reinforcing a trenchless underground drainage pipe net cage culvert and a preparation method thereof, and the spraying material comprises the following components in parts by weight: 100 parts of spraying dry powder and 10-15 parts of water; the jet dry powder comprises the following components in percentage by mass: 40%-60% of Portland cement, 3%-5% of sulphoaluminate cement, 30%-50% of natural graded medium sand, 3%-5% of fly ash microspheres, 6%-10% of heavy calcium powder, 0.5%-1.5% of redispersible latex powder, 0.1%-0.3% of a polycarboxylic acid superplasticizer, 0.02%-0.1% of hemp stem fibers, 0.01%-0.1% of starch ether and 0.01%-0.2% of a defoaming agent; the material has the advantages of corrosion resistance, strong impermeability, high strength, stable performance, sagging resistance and easy trowelling performance, and is convenient for spraying construction; the preparation process is simple, construction is convenient and efficient, and the method is specially used for repairing and reinforcing construction of the trenchless underground drainage pipe net cage culvert.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a spraying material for repairing and reinforcing a trenchless underground drainage network box culvert and a preparation method thereof. Background Art

[0002] Major cities in the upper and lower reaches of the Yangtze River are carrying out environmental protection rectification and repair work in full swing. After decades of use, the urban underground sewage pipe network is affected by the underground environment and is prone to leakage and damage, which leads to pollution of the groundwater environment and has a great impact on its carrying capacity. Severe cases may lead to pipeline collapse. Therefore, the underground sewage pipe network is an important part of urban repair.

[0003] At present, the repair of municipal underground sewage pipe networks is divided into two methods: excavation and trenchless. For places with roads, communities and other buildings on the ground, underground pipes can only be repaired by trenchless methods. Considering the complexity of the construction environment, a better repair method is to spray anti-seepage and anti-corrosion mortar to play an anti-seepage reinforcement role for underground pipes. Therefore, it is particularly important to develop a spraying material for the repair and reinforcement of trenchless underground drainage pipe culverts. Summary of the invention

[0004] After extensive and in-depth research, the inventors of the present invention have developed a spraying material for the repair and reinforcement of non-excavation underground drainage pipe culverts. The material has the properties of corrosion resistance, strong permeability resistance, high strength, stable performance, anti-sagging, easy smoothing, and convenient spraying construction. After spraying construction, it has early strength and high strength effects, and the construction is convenient and efficient, and the construction performance is good.

[0005] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0006] The first aspect of the present invention provides a spray material for repairing and reinforcing a trenchless underground drainage network box culvert, which comprises, by weight: 100 parts of spray dry powder and 10-15 parts of water; wherein the spray dry powder comprises, by mass percentage: 40%-60% of ordinary Portland cement, 3%-5% of sulphoaluminium cement, 30%-50% of natural graded medium sand, 3%-5% of fly ash microbeads, 6%-10% of heavy calcium powder, 0.5%-1.5% of redispersible latex powder, 0.1%-0.3% of polycarboxylic acid high-efficiency water reducing agent, 0.02%-0.1% of hemp stalk fiber, 0.01%-0.1% of starch ether, and 0.01%-0.2% of defoaming agent.

[0007] Furthermore, the spray dry powder is prepared by mixing the raw materials in a zero-gravity mixer for 8-12 minutes.

[0008] Furthermore, the silicate cement is No. 425 ordinary silicate cement.

[0009] Furthermore, the maximum particle size of the natural graded sand is not greater than 5 mm.

[0010] Furthermore, the hemp stalk fiber comes from Canadian Greenfield Company in Canada.

[0011] The second aspect of the present invention also provides a method for preparing the above-mentioned spraying material for repairing and reinforcing non-excavation underground drainage pipe network box culverts, comprising: mixing the spraying dry powder with water and stirring evenly, and conveying it to the spraying equipment, and spraying the above-mentioned mixture evenly together by wind pressure to obtain the repair and reinforcement spraying material; and in some preferred embodiments, the spraying rate is 100-150L / min, and the one-time spraying thickness is 50-100mm.

[0012] The third aspect of the present invention further provides the use of the above-mentioned spraying material for repairing and reinforcing the box culvert of the trenchless underground drainage pipe network as a repairing and reinforcing material for the box culvert of the trenchless underground drainage pipe network.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Currently, spraying materials are used for non-stress-bearing structures such as protective layers, and their strength basically does not exceed C40. The present invention mixes a variety of raw materials to achieve a high strength of more than C65, so that the spraying material of the present invention can be used for spray repair and reinforcement of underground drainage pipe networks.

[0015] 2. The present invention adds raw materials such as sulphoaluminium cement, fly ash microbeads, and heavy calcium powder to make the spray material resistant to corrosion by sulfuric acid, citric acid, etc., so that it can be used in corrosive environments such as underground sewage pipe networks.

[0016] 3. The present invention innovatively uses hemp stalk fibers imported from Canada. Currently, there is no hemp stalk fiber in the domestic market, and all of them are polypropylene fiber synthetic fibers. Compared with the single-root and smooth-surface characteristics of polypropylene synthetic fibers, hemp stalk plant fibers have better workability, which can make the spraying material have better integrity after being sprayed onto the box culvert wall, making it less likely to sag after spraying, improving the crack resistance and anti-seepage performance of the spraying material, and making the spraying effect denser.

[0017] Fourth, the spray dry powder in the spray material of the present invention is mixed evenly in the production plant. At the construction site, only water needs to be added for stirring before spraying through the spraying equipment, which reduces pollution at the construction site and avoids errors and misoperations that may be caused by adding various component raw materials during on-site stirring, making the product performance of the spray material more stable. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are given below to explain the technical solution of the present invention in detail, but the protection scope of the present invention is not limited to the following embodiments.

[0019] In the following examples, the silicate cement is 425 ordinary silicate cement; the maximum particle size of the natural graded medium sand is not greater than 5 mm; the hemp stalk fiber is imported fiber from Canadian Greenfield Company of Canada, and the main component is the hemp stalk fiber of natural hemp stalk plant. The experimental methods are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.

[0020] Example 1

[0021] First, weigh according to mass percentage: 40% of silicate cement, 4% of sulphoaluminum cement, 45% of natural graded medium sand, 4% of fly ash microspheres, 6% of heavy calcium powder, 0.7% of redispersible latex powder, 0.1% of polycarboxylic acid high-efficiency water reducing agent, 0.1% of hemp stalk fiber, 0.05% of starch ether, and 0.05% of defoaming agent, and mix the above raw materials in a zero-gravity mixer for 8 minutes to obtain a spray powder; then weigh 100 parts of the above spray powder according to weight parts, and add 10 parts of water for standby use.

[0022] Example 2

[0023] First, weigh according to mass percentage: 45% of silicate cement, 5% of sulphoaluminum cement, 35% of natural graded medium sand, 5% of fly ash microspheres, 8% of heavy calcium powder, 1.4% of redispersible latex powder, 0.3% of polycarboxylic acid high-efficiency water reducing agent, 0.1% of hemp stalk fiber, 0.1% of starch ether, and 0.1% of defoaming agent, and mix the above raw materials in a zero-gravity mixer for 8 minutes to obtain a spray powder; then weigh 100 parts of the above spray powder and 11 parts of water according to weight parts and set aside.

[0024] Example 3

[0025] First, weigh according to mass percentage: 55% of silicate cement, 3% of sulphoaluminium cement, 30% of natural graded medium sand, 3% of fly ash microspheres, 7% of heavy calcium powder, 1.5% of redispersible latex powder, 0.3% of polycarboxylic acid high-efficiency water reducing agent, 0.05% of hemp stalk fiber, 0.1% of starch ether, and 0.05% of defoaming agent, and mix the above raw materials in a zero-gravity mixer for 12 minutes to obtain spray dry powder; then weigh 100 parts of the above spray dry powder and 12 parts of water according to weight parts, mix the spray dry powder and water and stir evenly, and send the spray material to the spray gun of the spraying equipment by wind pressure for uniform spraying, the spraying rate is 100-150L / min, and the one-time spraying thickness is 50-100mm, so as to obtain the spray material for repairing and reinforcing the box culvert of the trenchless underground drainage network.

[0026] Example 4

[0027] First, weigh according to mass percentage: 55% of silicate cement, 3% of sulphoaluminum cement, 30% of natural graded medium sand, 5% of fly ash microspheres, 6% of heavy calcium powder, 0.5% of redispersible latex powder, 0.3% of polycarboxylic acid high-efficiency water reducing agent, 0.05% of hemp stalk fiber, 0.05% of starch ether, and 0.1% of defoaming agent, and mix the above raw materials in a zero-gravity mixer for 10 minutes to obtain spray dry powder; then weigh 100 parts of the above spray dry powder and 12 parts of water according to weight parts, mix the spray dry powder and water and stir evenly, and send the spray material to the spray gun of the spraying equipment by wind pressure for uniform spraying, the spraying rate is 100-150L / min, and the one-time spraying thickness is 50-100mm, so as to obtain the spray material for repairing and reinforcing the box culvert of the trenchless underground drainage network.

[0028] Effect Example 1

[0029] The spray dry powder in the above embodiment 1 is mixed with 10% water and transported to the spraying equipment at a spraying rate of 100L / min and a one-time spraying thickness of 100mm to obtain a spray material for repairing and reinforcing a non-excavation underground drainage network box culvert. According to the concrete inspection standard, the 1d compressive strength of the above spray material can reach more than 25MPa, the 28d compressive strength exceeds 65MPa, the anti-seepage grade reaches P15 grade, and the comprehensive performance is excellent.

[0030] Effect Example 2

[0031] The spray dry powder in Example 2 was mixed with 11% water and transported to the spraying equipment at a spraying rate of 150L / min, and the one-time spraying thickness could reach 100mm. It was further proved that the material had stable performance, good construction performance, good workability during the pumping process of the spraying equipment, and had self-compacting, easy filling, anti-sagging, easy leveling and rapid setting and early strength effects after being sprayed onto the box culvert reinforcement steel mesh. In addition, the acid resistance test was carried out in accordance with relevant standards and specifications, with no bubbles, no shedding, no cracks, and excellent performance.

[0032] Comparative Example 1

[0033] The spray material was prepared according to the formula of Example 3, which differed from the spray material in that polypropylene synthetic fiber was used. Compared with the spray material for repairing and reinforcing the trenchless underground drainage network box culvert of Example 3, the spray material had slow spraying efficiency, difficult spraying, poor anti-sagging and anti-seepage performance.

[0034] The above is only a preferred embodiment of the present invention, but the present invention should not be limited to the contents disclosed in the embodiment. Therefore, any equivalent or modification completed without departing from the spirit disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A spraying material for repairing and reinforcing a trenchless underground drainage network box culvert, comprising, by weight: 100 parts of spray dry powder and 10-15 parts of water; wherein the spray dry powder comprises, by mass percentage, 40%-60% of silicate cement, 3%-5% of sulphoaluminum cement, 30%-50% of natural graded medium sand, 3%-5% of fly ash microspheres, 6%-10% of heavy calcium powder, 0.5%-1.5% of redispersible latex powder, 0.1%-0.3% of polycarboxylic acid high-efficiency water reducing agent, 0.02%-0.1% of hemp stalk fiber, 0.01%-0.1% of starch ether, and 0.01%-0.2% of defoaming agent.

2. The injection material for repairing and reinforcing a trenchless underground drainage network box culvert according to claim 1, characterized in that: The spray dry powder is prepared by mixing the raw materials in a zero-gravity mixer for 8-12 minutes.

3. The injection material for repairing and reinforcing a trenchless underground drainage network box culvert according to claim 1, characterized in that: The silicate cement is No. 425 ordinary silicate cement.

4. The injection material for repairing and reinforcing a trenchless underground drainage network box culvert according to claim 1, characterized in that: The maximum particle size of the natural graded sand is no more than 5 mm.

5. The injection material for repairing and reinforcing a trenchless underground drainage network box culvert according to claim 1, characterized in that: The hemp stalk fibers are from Canadian Greenfield Company of Canada.

6. The method for preparing the injection material for repairing and reinforcing the trenchless underground drainage network box culvert according to any one of claims 1 to 5, characterized in that: include: The spray dry powder is mixed with water and stirred evenly, and then transported to the spraying equipment, and the mixture is evenly sprayed together by wind pressure to obtain the product.

7. The method for preparing the spraying material for repairing and reinforcing the trenchless underground drainage network box culvert according to claim 6, characterized in that: The spraying rate is 100-150L / min, and the one-time spraying thickness is 50-100mm.

8. Use of the spraying material for repairing and reinforcing the trenchless underground drainage pipe network box culvert as described in any one of claims 1 to 5 as a repairing and reinforcing material for the underground drainage pipe network box culvert.