30results about How to "Improve flow plasticity" patented technology

The invention relates to a muck improvement material for earth pressure balance pipe jacking in an anhydrous sand layer, which consists of a modifier and a filler, wherein the modifier is uniformly mixed and stirred by bentonite, loess, external admixture and water , and, described bentonite is sodium-based bentonite, loess is Q3 loess, external admixture is polyacrylamide (PAM) and water glass, and the mass ratio of each component of modifier is: sodium-based bentonite: Q3 loess: polyacrylamide (PAM): water glass: water=50~70:30~40:1~2:20~30:1000; the filler is made by mixing and stirring loess and water, and the loess is Q3 loess, and The mass ratio of each component of the filler is: Q3 loess: water = 1:0.8~1. The application of the present invention can effectively improve the improvement effect of the dregs cut off from the face of the tunnel in the soil cabin during the construction of pipe jacking in the water-free sand layer, effectively reduce the settlement displacement of the soil in front of the tunnel face, and have great influence on the construction of pipe jacking projects. positive meaning.

The invention discloses a muck improver special for a sandy gravel stratum shield. The muck improver is prepared from the following raw materials in percent by mass: 0.2-1.0% of a tackifying antiwear additive, 4.0-10.0% of an anionic surfactant, 1.0-4.0% of a nonionic surfactant A, 1.0-4.0% of a nonionic surfactant B and the balance of water with a total mass percent of 100%, wherein the tackifying antiwear additive is one or a mixture of anionic polyacrylamide, sodium carboxymethylcellulose and hydroxyethyl cellulose. The muck improver special for the sandy gravel stratum shield remarkably increases muck cohesive force, decreases osmotic coefficient and internal friction angle of muck, reduces abrasion of muck to equipment, improves flow plasticity of muck and reduces energy consumption.

The present invention provides a water-rich sand egg formation shield dreg improvement admixture and a preparation method thereof. The dreg improvement admixture is a water-rich sand egg formation shield dreg improvement admixture, which comprises or consists of the following mass: Content composition: tackifier A 0.1~1wt%, tackifier B 0.025~1wt%, surfactant 0.025~0.5wt%, pumping agent 1~10wt%, pH regulator 0.01~0.06wt%, mineral 5-15wt% class modifier and water. After the dregs improvement admixture described in the present invention is used to improve the shield muck in the water-rich sand egg formation, it can better avoid and reduce the occurrence of gushing during the construction of the earth pressure balance shield, and ensure the safe and smooth implementation of the construction. And the cut soil is easy to transport.

The invention discloses an efficient improver for preventing mud cake. The efficient improver is prepared from 0.5 to 3.0% by mass of an anti-sticking additive, 4.0 to 10.0% by mass of an anionic surfactant, 1.0 to 4.0% by mass of a nonionic surfactant A, 1.0 to 4.0% by mass of a nonionic surfactant B and the balance water. The anti-sticking additive comprises one or two of sodium polyacrylate and sodium lignosulphonate. The efficient improver significantly reduces the adhesion of the dregs, reduces the adhesion of dregs to a cutter plate and blocking of the cutter plate, improves dreg plasticity and reduces energy consumption.

The invention relates to an easily degradable environment-friendly dispersing foaming agent for mudstone geological shield and a preparation method. The foaming agent is calculated according to the weight percentage, and is composed of the following raw materials by weight percentage: 5-15% of alkyl ethyl sulfonate , rhamnolipid 2-5%, lactate 1-3%, carrageenan 0.5-1%, citric acid 1-3%, potassium tannin 0.5-2%, chitosan 0.2-0.7%, more The amount is water. The raw materials used in the present invention can be rapidly degraded by microorganisms in the natural environment, and there is no secondary toxic by-products, which highlights the great environmental protection feature. The prepared foaming agent has the advantages of small environmental impact, strong foaming ability, good foam stability, fast mudstone dispersion speed, and excellent slag soil improvement effect. It solves the technical problems such as the traditional foaming agent polluting the soil and water environment and the mudstone dispersion effect is poor, expanding the backfill treatment method of shield slag, and at the same time increasing the efficiency of mudstone geological shield, reducing the cost of shield construction, environmental protection and economy. The benefits are significant.

A water-rich sand layer shield tunneling slag improvement construction test method includes the following steps: 1. Adding prefabricated modifiers to the shield machine cutter head, soil bin and screw conveyor respectively. 2. Determine the modifier parameters: Select the first 100m of the shield as the test section, set the same excavation parameters, and set different modifier parameters, and test the excavation in the test section. 3. Measure the parameters of the tunnel, the amount of unearthed soil and the improvement parameters of the slag after the excavation, and adjust the parameters of the modifier to determine the parameters of the modifier during the formal excavation. 4. Determine the excavation parameters: the parameters of the modifier are the same, and the shield machine will try to excavate in the test section under different excavation parameters. 5. Measure the tunnel parameters, excavation volume and slag improvement parameters after excavation and adjust the excavation parameters to determine the formal excavation parameters of the shield machine. The method solves the problem that in the prior art, due to the unreasonable setting of the modifier parameters and the tunneling parameters, the slag soil improvement effect is not good, the tunneling speed is reduced, and the wear of the shield machine is increased.

The invention discloses a bentonite pulping control system for shield construction, which includes a liquid level detection module for detecting the liquid level of a stirring tank and outputting different signals according to three liquid levels of the stirring tank, namely, low, medium and high. The power supply module powered by the liquid level detection module and the relay control module used to control the working state of the mixing tank according to the different signals output by the liquid level detection module, the liquid level detection module is connected to the relay control module , the liquid level detection module includes a metal liquid level gauge connection sub-module, a high liquid level detection sub-module and a medium-low liquid level detection sub-module. The invention also discloses a control method. The present invention adopts the above-mentioned bentonite pulping control system for shield tunneling, which can realize the ratio and output control of bentonite slurry in the construction of full-section anhydrous sand layer shield, and can improve the flow plasticity of shield dregs and reduce the amount of shielding. The degree of wear of the cutter head.

The invention provides a foaming agent for improvement of slag oil of a soil pressure balance shield and a preparation method thereof. The foaming agent for the improvement of the slag oil of the soilpressure balance shield is prepared from the following components in percentage by weight: 4% to 8% of alpha-alkenyl sodium sulfonate, 8% to 12% of lauryl sodium sulfate, 3% to 5% of alkylphenol polyoxyethylene, 0.05% to 0.2% of xanthan gum, 1% to 4% of coconut oil fatty acid diethanolamide, 1% to 3% of sodium gluconate, 0.5% to 2% of polyethylene oxide, 1% to 2% of polyaspartic acid, and the balance of water. The foaming agent has the advantages that by adopting the alpha-alkenyl sodium sulfonate, the lauryl sodium sulfate and the alkylphenol polyoxyethylene to prepare the foaming agent, thefoaming ability is enhanced under the compounding and cooperation function of the alpha-alkenyl sodium sulfonate, the lauryl sodium sulfate and the alkylphenol polyoxyethylene; the foaming time is greater than 30 times; by adopting the coconut oil fatty acid diethanolamide to enhance the surface action force of the air foam through cooperation, the stability of the foam under the high-speed shearing function of a knife disc is improved; the pressure fluctuation of a soil bin is reduced; the stability of the excavated surface of the shield is improved.