Preparation and construction method of high-strength anti-seepage self-compacting core grouting material for module inspection well

Abstract

The invention belongs to the technical field of building materials, and provides a preparation and construction method of a high-strength anti-seepage self-compacting core grouting material for a module inspection well. The high-strength anti-seepage self-compacting core grouting material for the module inspection well is composed of cement, fly ash, fine aggregate, silica fume, an expanding agent, dried river sand and an additive. The construction method of the high-strength anti-seepage self-compacting core grouting material for the module inspection well comprises the following steps: 1, building the module inspection well; 2, the high-strength anti-seepage self-compacting core grouting material is mixed in a factory; 3, water is added on the construction site, and the high-strength anti-seepage self-compacting core grouting material mixed in the factory is mixed into core grouting mortar; and 4, core grouting construction and maintenance are conducted. By utilizing the characteristic that only water needs to be added on a construction site of the high-strength anti-seepage self-compacting core grouting material for the module inspection well, the mixed core grouting mortar has high strength, anti-seepage performance and self-compacting performance, the defects that on-site mixed module core grouting concrete is low in strength and complicated in construction are overcome, and the application prospect is wide.

Description

Technical Field

[0001] The invention relates to a preparation and construction method of a high-strength, anti-seepage self-compacting core filling material for a module inspection well, and in particular to a preparation and construction method of a high-strength, non-shrinkage core filling material for a prefabricated module inspection well. Background Art

[0002] Inspection wells, commonly known as "manholes", are pipe network junction hubs that are buried underground and connected to the city's underground pipelines. They are generally located at the intersection of drainage pipes, bends, changes in pipe diameter or slope, waterfalls, and at certain intervals on straight pipe sections. They are workstations that are convenient for regular inspection, cleaning and unblocking of pipes to prevent pipe blockages. Inspection wells need to be installed wherever there are public pipe network facilities such as water supply, drainage, telecommunications, electricity, gas, heating, fire protection, and sanitation.

[0003] The modular inspection well is assembled on the construction site from the prefabricated inspection well modules in the factory, and is bonded with C30 concrete core with a permeability grade of P3. The inspection well module is made of sand, stone, cement, fly ash, etc. according to the proportion, and is compounded by high-frequency vibration and vertical extrusion. The product has been standardized, normalized, and serialized. The characteristics are: high compression resistance, corrosion resistance and durability, wedge-type chain lock, beautiful masonry, energy saving and environmental protection, and convenient assembly construction. However, in recent years, due to the small amount of core-bonded concrete used in a single time, the mixing and transportation cost of the mixing station is high, and the on-site mixing of the core-bonded concrete has low strength and large shrinkage, and the vibration construction process of the core-bonded concrete is uncontrollable, resulting in poor construction quality of the modular inspection well.

[0004] Based on the above problems, it is imperative to study a modular inspection well core material that is simple to mix on site, has stable and controllable quality, high strength, and is self-compacting and does not require vibration. Summary of the invention

[0005] The present invention proposes a preparation and construction method of high-strength, anti-seepage self-compacting grouting material for modular inspection wells, which effectively improves the problems of poor construction quality of modular inspection wells caused by factors such as high mixing and transportation costs of mixing stations, low strength and large shrinkage of on-site mixed grouting cementing concrete, and uncontrollable vibration construction technology of grouting concrete. The invention has broad application prospects.

[0006] To achieve the above-mentioned purpose, the present invention provides a preparation and construction method of high-strength, non-shrinkage inspection well core material, and the specific steps of the high-strength, anti-seepage, self-compacting core material for the modular inspection well are as follows: a high-strength, anti-seepage, self-compacting core material for the modular inspection well, composed of cement, fly ash, fine aggregate, silica fume, expansion agent, dried river sand and admixture.

[0007] The cement is PO42.5, the water consumption for standard consistency is 130g, the initial setting time is no earlier than 45 minutes, and the final setting time is no later than 390 minutes.

[0008] The fly ash is first-class ash, and the active silicon dioxide (SiO2) content in the silica ash is about 95%, which can increase the strength of the core filling material and realize the high-strength performance of the core filling material.

[0009] The fine aggregate is river sand with a particle size of less than 1.18 mm, which has been processed by a drying process and has a tax rate of less than 0.2%. The particle size is less than 1.18 mm, and the transportation and storage of dry mix of the core filling material can be realized.

[0010] The admixture is a low-viscosity polycarboxylic acid high-performance admixture (water reduction rate ≥ 20%). Compared with other common admixtures, this admixture reduces the viscosity of the core filling material and enhances workability. This admixture makes the core filling material self-compacting, fluid, and vibration-free, and can achieve self-compacting of the core filling material.

[0011] The raw materials are 1.5 parts by weight of PO42.5 cement, 0.3-0.4 parts by weight of fly ash, 0.1-0.3 parts by weight of silica fume, 1.1-1.5 parts by weight of dried river sand, 2-4% of cementitious material as admixture, and 10-12% of cement as expansion agent.

[0012] The high-strength non-shrinkage inspection well core material is prepared by mechanically mixing cement, fly ash, silica fume, expansion agent, dried river sand and admixture with dry powder.

[0013] A construction method for high-strength, anti-seepage self-compacting core material for modular inspection wells mainly comprises the following steps:

[0014] Step 1: For modular inspection well masonry, the first-floor concrete modules should be positioned using a total station according to the design drawings, and the modules should be placed correctly according to the size of the inspection well. During installation, the module base mortar should be dense, the concave and convex grooves should be firmly connected, the mortar should be full and uniform, and it is strictly forbidden to use broken modules or modules with vertical cracks on the wall ribs for masonry.

[0015] Step 2: The factory mixes high-strength, anti-seepage self-compacting core filling material. Cement, fly ash, silica fume, expansion agent, dried river sand and admixtures are mixed into a uniform dry powder. The weight proportion of each raw material is 1 part of cement, 0.4 parts of fly ash, 0.1 parts of silica fume, 0.1 parts of expansion agent, 1.56 parts of dried river sand, and 0.03 parts of admixture. After stirring evenly, bag it for later use.

[0016] Step 3: Add 0.3 parts of water at the construction site and mix the high-strength, anti-seepage and self-compacting core filling material prepared in the factory into core filling mortar.

[0017] Step 4: Core pouring construction and maintenance. The core pouring mortar is poured every 3-5 layers of the modular inspection well. The high-strength, anti-seepage and self-compacting core pouring material of the modular inspection well mixed with water is poured into the cavity of the modular inspection well structure from the top. The high-strength, anti-seepage and self-compacting core pouring material of the modular inspection well is poured evenly. Repeat the above steps every 3-5 layers to ensure that the core pouring material fills all gaps and cavities. After the pouring is completed, take appropriate maintenance measures, such as covering with a moisturizing film, spraying water or performing appropriate temperature control, to promote the full curing and strength development of the core pouring material.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention proposes a formula and a process. The first formula requires factory mixing of high-strength, anti-seepage, self-compacting dry-mixed core filling materials to achieve standardization of the quality of the core filling materials; the second process proposes a new process, that is, the factory-mixed high-strength, anti-seepage, self-compacting core filling materials are mixed with water according to a proportion to form core filling mortar at the construction site, and the core filling mortar is poured after the inspection well module is assembled and then cured and formed, which is free of vibration and has a simple construction process. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] A preparation and construction method of a high-strength, non-shrinkage inspection well core material. The specific steps of the high-strength, anti-seepage, self-compacting core material for the modular inspection well are as follows: A high-strength, anti-seepage, self-compacting core material for the modular inspection well is composed of cement, fly ash, fine aggregate, silica fume, expansion agent, dried river sand and admixture.

[0023] The cement is PO42.5, the water consumption for standard consistency is 130g, the initial setting time is no earlier than 45 minutes, and the final setting time is no later than 390 minutes.

[0024] The fly ash is first-class ash, and the active silicon dioxide (SiO2) content in the silica ash is about 95%, which can increase the strength of the core filling material and realize the high-strength performance of the core filling material.

[0025] The fine aggregate is river sand with a particle size of less than 1.18 mm, which has been processed by a drying process and has a tax rate of less than 0.2%. The particle size is less than 1.18 mm, and the transportation and storage of dry mix of the core filling material can be realized.

[0026] The admixture is a low-viscosity polycarboxylic acid high-performance admixture (water reduction rate ≥ 20%). Compared with other common admixtures, this admixture reduces the viscosity of the core filling material and enhances workability. This admixture makes the core filling material self-compacting, fluid, and vibration-free, and can achieve self-compacting of the core filling material.

[0027] The raw materials are 1.5 parts by weight of PO42.5 cement, 0.3-0.4 parts by weight of fly ash, 0.1-0.3 parts by weight of silica fume, 1.1-1.5 parts by weight of dried river sand, 2-4% of cementitious material as admixture, and 10-12% of cement as expansion agent.

[0028] The high-strength non-shrinkage inspection well core material is prepared by mechanically mixing cement, fly ash, silica fume, expansion agent, dried river sand and admixture with dry powder.

[0029] A construction method for high-strength, anti-seepage self-compacting core material for modular inspection wells mainly comprises the following steps:

[0030] Step 1: For modular inspection well masonry, the first-floor concrete modules should be positioned using a total station according to the design drawings, and the modules should be placed correctly according to the size of the inspection well. During installation, the module base mortar should be dense, the concave and convex grooves should be firmly connected, the mortar should be full and uniform, and it is strictly forbidden to use broken modules or modules with vertical cracks on the wall ribs for masonry.

[0031] Step 2: The factory mixes high-strength, anti-seepage self-compacting core filling material. Cement, fly ash, silica fume, expansion agent, dried river sand and admixtures are mixed into a uniform dry powder. The weight proportion of each raw material is 1 part of cement, 0.4 parts of fly ash, 0.1 parts of silica fume, 0.1 parts of expansion agent, 1.56 parts of dried river sand, and 0.03 parts of admixture. After stirring evenly, bag it for later use.

[0032] Step 3: Add 0.3 parts of water at the construction site and mix the high-strength, anti-seepage and self-compacting core filling material prepared in the factory into core filling mortar.

[0033] Step 4: Core pouring construction and maintenance. The core pouring mortar is poured every 3-5 layers of the modular inspection well. The high-strength, anti-seepage and self-compacting core pouring material of the modular inspection well mixed with water is poured into the cavity of the modular inspection well structure from the top. The high-strength, anti-seepage and self-compacting core pouring material of the modular inspection well is poured evenly. Repeat the above steps every 3-5 layers to ensure that the core pouring material fills all gaps and cavities. After the pouring is completed, take appropriate maintenance measures, such as covering with a moisturizing film, spraying water or performing appropriate temperature control, to promote the full curing and strength development of the core pouring material.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-strength, anti-seepage, self-compacting core material for modular inspection wells, characterized by: It is composed of cement, fly ash, fine aggregate, silica fume, expansion agent, dried river sand and admixtures.

2. The high-strength, anti-seepage self-compacting core material for modular inspection wells according to claim 1 is characterized in that: Fly ash is a primary ash. The content of active silicon dioxide (SiO2) in the fly ash is about 95%, which can increase the strength of the core filling material and achieve high-strength performance of the core filling material.

3. The high-strength, anti-seepage, self-compacting core material for modular inspection wells according to claim 1 is characterized in that: The fine aggregate is river sand processed by a drying process, with a tax rate of less than 0.2% and a particle size of less than 1.18 mm, which can realize the transportation and storage of dry mix of core filling materials.

4. The high-strength and anti-seepage self-compacting core material for modular inspection wells according to claim 1 is characterized in that: The admixture is a low-viscosity polycarboxylic acid high-performance admixture (water reduction rate ≥ 20%). Compared with other common admixtures, this admixture reduces the viscosity of the core filling material and enhances workability. This admixture makes the core filling material self-compacting, fluid, and vibration-free, and can achieve self-compacting of the core filling material.

5. The high-strength, anti-seepage self-compacting core material for modular inspection wells according to claim 1 is characterized in that: The composition includes 1.5 parts by mass of PO42.5 cement, 0.3-0.4 parts by mass of fly ash, 0.1-0.3 parts by mass of silica fume, 1.1-1.5 parts by mass of dried river sand, 2-4% of cementitious material as admixture, and 10-12% of cement as expansion agent.

6. The high-strength, anti-seepage, self-compacting core material for modular inspection wells according to claim 1 is characterized in that: Cement, fly ash, silica fume, expansion agent, dried river sand and admixtures are mixed in the factory, stirred into a uniform dry powder mixture and bagged for use.

7. A method for constructing a high-strength, anti-seepage self-compacting core material for a modular inspection well, using any one of claims 1 to 6, the main steps of which are: Step 1: For modular inspection well masonry, the first-floor concrete modules should be positioned using a total station according to the design drawings, and the modules should be placed correctly according to the size of the inspection well. During installation, the module base mortar should be dense, the concave and convex grooves should be firmly connected, the mortar should be full and uniform, and it is strictly forbidden to use broken modules or modules with vertical cracks on the wall ribs for masonry. Step 2: The factory mixes high-strength, anti-seepage self-compacting core filling material. Cement, fly ash, silica fume, expansion agent, dried river sand and admixtures are mixed into a uniform dry powder. The weight proportion of each raw material is 1 part of cement, 0.4 parts of fly ash, 0.1 parts of silica fume, 0.1 parts of expansion agent, 1.56 parts of dried river sand, and 0.03 parts of admixture. After stirring evenly, bag it for later use. Step 3: Add 0.3 parts of water at the construction site and mix the high-strength, anti-seepage and self-compacting core filling material prepared in the factory into core filling mortar. Step 4: Core pouring construction and maintenance. The core pouring mortar is poured every 3-5 layers of the modular inspection well. The high-strength, anti-seepage and self-compacting core pouring material of the modular inspection well mixed with water is poured into the cavity of the modular inspection well structure from the top. The high-strength, anti-seepage and self-compacting core pouring material of the modular inspection well is poured evenly. Repeat the above steps every 3-5 layers to ensure that the core pouring material fills all gaps and cavities. After the pouring is completed, take appropriate maintenance measures, such as covering with a moisturizing film, spraying water or performing appropriate temperature control, to promote the full curing and strength development of the core pouring material.