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Calculation method for scraper extrapolation angle of expansible mudstone cutterhead

A calculation method and expansive technology, which can be used in earth-moving drilling, mining equipment, mining equipment, etc., and can solve problems such as uncontrollable shield direction, uneconomical construction risks, and surface subsidence.

Active Publication Date: 2022-04-08
BEIJING MUNICIPAL CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the shield machine excavates in expansive rock formations, due to the characteristics of expansive rocks and soils that expand when exposed to water and shrink when they lose water, in rock layers with a large expansion coefficient, the shield machine is easily wrapped by the rocks and soils that expand when encountering water. , leading to the uncontrollable direction of the shield, which may eventually cause the deviation of the tunnel line to exceed the limit
On the construction site, the method of extending the edge cutter to expand the excavation diameter is often adopted, but the extension of the cutter is often determined by construction experience, which has great uncertainty
If the extension of the cutter is not enough, the excavation diameter still cannot meet the minimum requirements for shield tunneling; if the extension of the cutter is too long and the excavation diameter is too large, it will lead to excessive loss of the stratum and subsidence of the ground surface, which is neither economical nor harmful. great construction risk

Method used

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  • Calculation method for scraper extrapolation angle of expansible mudstone cutterhead
  • Calculation method for scraper extrapolation angle of expansible mudstone cutterhead
  • Calculation method for scraper extrapolation angle of expansible mudstone cutterhead

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Embodiment 1

[0038] see figure 1 , a calculation method for the extrapolation angle of the expansive mudstone cutterhead scraper, comprising the following steps

[0039] Step 1. Calculation assumes that the soil disturbance area excavated by the shield tunnel is the soil area at the distance from the axis of the shield tunnel. After the soil absorbs water, the volume of the soil changes and all of them converge toward the tunnel.

[0040] Step 2. Calculation of soil volume difference under different conditions. According to the tunnel excavation radius, cutter head radius and tunnel excavation radius of the shield machine, the volume of the soil when it is completely dry and the final volume of the soil after absorbing water and swelling are calculated respectively. Then obtain the volume difference of the soil in the two states;

[0041] Step 3: Calculation of the angle of the cutter inserting into the soil. According to the tunnel excavation radius and the radius of the cutterhead, subs...

Embodiment 2

[0065] A calculation method for the extrapolation angle of expansive mudstone cutterhead scraper. Taking a subway section tunnel as an example, the shield tunneling method is used for construction. The diameter of the shield machine is 6.28m (that is, the radius of the cutterhead is R 2 =3.14m), the radial direction of the super-excavation knife is 50mm, and the tunnel excavation radius is R 1= 3.19m, the length of the scraper is 90mm, according to engineering experience, the excavation radius of the tunnel is R 1 3 times of D 0 =3*R1=9.57m.

[0066] Putting the above parameters into the formula (1), the volume change rate of the soil expanding to the tunnel can be obtained as α

[0067]

[0068] Put α, R 1 , R 2 , l into the formula (4), the angle β of the tool insertion into the soil can be obtained

[0069] (2*3.14*0.09+2*0.38%*3.14*0.09)+=0.38%*(9.572-3.142)

[0070] sinβ=0.54

[0071] β=32.7°

[0072] Working principle: By combining the expansion coefficient of...

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Abstract

The invention discloses a calculation method of an expansive mudstone cutterhead scraper extrapolation angle. The calculation method comprises the steps of calculation assumption, calculation of soil body volume difference in different states and calculation of the angle of a cutter inserted into a soil body. The method has the beneficial effects that the expansibility coefficients of the cutter and the soil body are combined to list the quadratic equation, and the data of the shield cutter head are collected on site, so that the angle of the scraper, inserted into the soil body, of the shield cutter can be conveniently calculated when the expansibility coefficients in the expansibility soil layer are different; the length of the shield expanding excavation cutter can be conveniently obtained through the angle obtained through calculation, the cutter angle can be changed according to different soil layers so that the shield excavation diameter can be changed, economic losses caused by extrusion of a shield tunneling machine due to expansion of the soil layers and trapping of the shield tunneling machine can be effectively avoided, and a guiding effect is provided for optimization of a cutter head cutter.

Description

technical field [0001] The invention relates to a calculation method for the external insertion angle of a cutterhead scraper of a shield machine, in particular to a calculation method for the external insertion angle of an expansive mudstone cutterhead scraper, and belongs to the technical field of tunnel engineering. Background technique [0002] The shield machine is a kind of engineering machinery used for tunnel construction, and is widely used in subway, railway, municipal and other tunnel projects. Compared with traditional tunnel construction methods, tunnel construction using shield machines has the characteristics of high safety, high construction efficiency and low cost. At present, shield machines have been widely used in tunnel construction in my country. [0003] When the shield machine excavates in expansive rock formations, because expansive rocks and soils have the characteristics of water swelling and dehydration shrinkage, in rock layers with a large expa...

Claims

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Application Information

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IPC IPC(8): E21D9/08E21D9/00E21F17/00
CPCY02E10/20
Inventor 张永恒孟庆龙曹跃李龙飞王荟理吴传锋何富思高峥宇魏凯乐于双双
Owner BEIJING MUNICIPAL CONSTR
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