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

A composite soil pressure balance shield machine, comprising : shell (1), cutter head (2), soil storer (3), spiral conveyer (4) and impelling oil cylinder (6),it is characterized in that the said cutter head is set front of the shell, equipped with tearing knife (21) and the cutting knife (22), and the cutter point of the said cutting knife is a little back of the tearing knife; the soil storer is located rear the cutter head, and its wall surface is installed with injecting holes (32), the rear end is installed with pressure balancing equipment (5), and a soil outlet (31)is set under the soil storer; the inlet under the spiral conveyer connects the soil outlet of the container; the said impelling oil cylinder are uniformly installed along the shell inner wall. The shield machine solves the normal tunneling problem on sand or gravel eggs (gravel) layer of high water permeability, or the normal tunneling problem when it need to pass through more than 30 centimeters large stones and other obstructions.

The invention discloses a new earth pressure balance shield machine and a working method thereof. The shield machine comprises a cutter head, a front shield, a middle shield, a miter gate, a tail shield, an assembling machine, a main drive and a screw conveyor. A front shield partition board is arranged between the front shield and the middle shield, front shield space is divided into two parts byinstalling a middle partition board in the front shield, the front is a mud chamber, and the rear is an air cushion chamber; the lower part of the middle partition board is not closed; the cutter head is connected with a big gear ring of the main drive by a support arm; a first gate, an air inlet and an overflow port are arranged on the front shield diaphragm board, and a second gate is arrangedon the miter gate; a passage gate and a passive mixing rod are arranged on the middle partition board; an active mixing rod is installed behind the cutter head; the first gate is arranged on the upperpart of the front shield partition board, and the lower part of the front shield partition board is provided with a slag conveying port. The new earth pressure balance shield machine is provided withthe mud chamber and the air cushion chamber, and a mud water balance shield play to the advantage. The shield machine further provides mixing rods, residual soil entering the mud chamber of the shield machine is stirred through the mixing rods, and flow plasticity of the residual soil is further increased.

The invention relates to the technical field of shield construction, in particular to a long-time shutdown construction method for a water-rich sand layer shield. The method comprises the following steps that S1, the pressure of a shield tunneling machine reaching a stop position is set; S2, bentonite is injected into the soil bin; S3, bentonite is injected into a soil body around the shield shell; S4, secondary supplementary grouting is conducted on the shield tail position, and a water stop hoop is formed; S5, the shield is pushed by 3 cm to 5 cm; S6, after the shield machine stops, pumpingshield tail grease; and S7, earth surface monitoring is conducted every day, and shield shutdown is completed. By means of the method, the influence of soft geology on long-time shutdown of the shieldis avoided, it is guaranteed that shield construction meets the design requirement, and construction recovery of the shield tunneling machine is facilitated. The method is mainly applied to the aspect of long-time shutdown of the water-rich sand layer shield.

The invention relates to a muck improvement material for an earth pressure balance jacking pipe in an anhydrous sand layer, the muck improvement material is composed of an improver and a filler, the improver is formed by uniformly mixing and stirring bentonite, loess, an admixture and water, the bentonite is sodium bentonite, the loess is Q3 loess, the admixture is polyacrylamide (PAM) and water glass, the mass ratio of the sodium bentonite to the Q3 loess to the polyacrylamide (PAM) to the water glass to the water is 50-70: 30-40: 1-2: 20-30: 1000; the filler is formed by uniformly mixing andstirring loess and water, the loess is Q3 loess, and the mass ratio of the Q3 loess to the water in the filler is 1: 0.8-1. By applying the method, the improvement effect of muck cut off from the tunnel face in the soil cabin during jacking construction of the jacking pipe in the anhydrous sand layer can be effectively improved, the settlement displacement of the soil body in front of the tunnelface is effectively reduced, and the method has positive significance in jacking pipe engineering construction.

The invention discloses a bentonite slurrying control system for shield construction. The bentonite slurrying control system for the shield construction comprises a liquid level detection module, a power source module, and a relay control module, wherein the liquid level detection module is used for detecting a liquid level of a stirring tank and outputting different signals according to a low liquid level of the stirring tank, a middle liquid level of the stirring tank, and a high liquid level of the stirring tank, the power source module supplies power to the liquid level detection module, and the relay control module is used for controlling working conditions of the stirring tank according to the different signals output by the liquid level detection module. The liquid level detection module is connected with the relay control module. The liquid level detection module comprises a metal liquid level meter connection sub-module, a high liquid level detection sub-module, and a middle and low liquid level detection sub-module. The invention further discloses a control method. Due to the fact that the bentonite slurrying control system for the shield construction and the control method are adopted, control to proportion and output of bentonite slurry in the full section non-water sand bed shield construction can be achieved, at the same time, soil flow ductility of shield muck can be improved, and abrasion degree of a shield cutter-disc is decreased.

The invention discloses a foaming agent for improving shield muck in a cohesive soil layer. The foaming agent comprises a foaming agent base solution, powder abelmoschus manihot gum as an additive and water; the volume part ratio of the foaming agent base solution to the water is (3-15): 100, and the mass part ratio of the additive to the water is (0.025-0.1): 100; the foaming agent base solution comprises a solid material alkyl sucrose glycoside serving as a main foaming agent and a liquid material fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, and the volume fraction ratio of the alkyl sucrose glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2: 1. Meanwhile, the invention further discloses a preparation method of the foaming agent for improving the shield muck in the cohesive soil layer and a use method of the foaming agent for improving the shield muck in the cohesive soil layer. The foaming agent is suitable for earth pressure balance shield muck improvement construction of the cohesive soil layer, the foaming ratio of the foaming agent is higher than 20 times, the half-life period is longer than 1200 s, the half-life period is almost zero within 5 min, generated foam is high in stability, high in gas-liquid level strength and high in foam density, and the foaming agent can enter soil gaps easily to improve the flow plasticity of the soil.

The invention belongs to the technical field of muck improvement in shield construction, and provides a test device and a test method for muck improvement effect evaluation, which can simulate the physical and mechanical properties of muck in the actual shield excavation and deslagging process and intuitively evaluate the unobstructed degree of muck discharge. The actual pressure value of a shield soil cabin can be simulated, and whether improved muck is homogeneous and good in flow plasticity or not is evaluated from the new angle of transmission efficiency and apparent density of muck force; the device is reasonable in design and high in operability, a small-scale model test is carried out before actual shield construction, the construction efficiency can be improved, and safe tunneling of a shield is guaranteed.

The invention discloses a shield tunneling machine muck improvement system, and belongs to the technical field of shield tunneling machine muck improvement, the shield tunneling machine muck improvement system comprises a shield tunneling machine body, the front end of the shield tunneling machine body is provided with a cutterhead, a soil bin and a screw conveyor, the soil bin is located on the rear side of the cutterhead and is communicated with a discharging runner on the cutterhead, and the screw conveyor is fixedly installed at the bottom of the rear side of the soil bin; the shield tunneling machine comprises a shield tunneling machine body, the shield tunneling machine body is internally provided with a soil bin, the soil bin is communicated with the bottom of the soil bin, and the shield tunneling machine body is further internally provided with a foam system used for injecting a foaming agent into muck so as to improve the muck. The additive is mixed with the soil slag through rotary stirring of the cutter head, stirring of the soil bin stirring device or rotary stirring of the spiral conveyor, so that the slag soil cut by a shield has good flow plasticity, appropriate consistency, low water permeability and small frictional resistance, and the ideal working condition of shield tunneling under different geological conditions can be met.

The invention discloses a deep sea polymetallic nodule mining area walking track device, which comprises a walking frame, and a driving wheel, a guide wheel, a bearing wheel, a drag chain wheel, a tensioning mechanism, a rail guard and a track which are arranged on the walking frame, and is characterized in that the track consists of an annular caterpillar track, and a driving plate and a compaction plate which are arranged on a caterpillar track section in a staggered manner; the driving plate and the compaction plate are provided with sealing surfaces; and sealing surfaces of the driving plates and the compacting plates which are mounted in a staggered manner are overlapped to form sealing. The device has the advantages of subsidence prevention, good driving performance, light weight, seawater corrosion resistance, simplicity in installation and debugging and the like.

The invention discloses a foaming agent for improving shield muck in a coastal silt soil layer. The foaming agent is prepared from a foaming agent base solution, a Changqing dispersing agent, powder abelmoschus manihot gum, flaxseed gum and water, the volume part ratio of the foaming agent base solution to the water is (4-12): 100, the volume part ratio of the liquid additive to the water is (2-10): 100, the volume part ratio of the powder additive to the water is (0.01-0.12): 100, and the mass part ratio of the powder abelmoschus manihot gum to the flaxseed gum is 1: 1; the foaming agent base solution comprises a liquid material alkyl sucrose glycoside and a solid material fatty alcohol polyoxyethylene ether sodium sulfate, and the volume part ratio is 2.5: 1. The invention also discloses a preparation method and a use method of the composition. The foaming ratio of the foaming agent is higher than 25 times, the half-life period is longer than 1500s, the half-life period within 5min is zero, the foam stability is high, the gas-liquid level strength is high, the foam density is high, the foaming agent can enter soil body gaps to improve the flow plasticity of the soil body, and the adhesion of the sludge cohesive soil is reduced.