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Tunnel boring method
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A drilling method, tunnel technology, applied in the direction of drilling compositions, tunnels, chemical instruments and methods, etc., can solve problems such as effective removal of difficulties
Inactive Publication Date: 2007-04-04
CONSTR RES & TECH GMBH
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Summary
Abstract
Description
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Application Information
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Problems solved by technology
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Problems solved by technology
For example, a problem with formation soils containing a high proportion of dirt and water is that the soil exhibits a high degree of fluidity, which not only makes it difficult to effectively remove from the excavation cavity, but also causes the soil to flow out of the excavation cavity at the rear of the shield
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0025] Examples to illustrate the effects of the invention.
[0026] The sample soil was taken from the "Singapore Metro" construction site (a heavy, watery clay) and subjected to a cone penetration test according to British Standard BS1377 Part 2, which gives the plasticity or flow of the material under test. The deeper the penetration of the cone, the stronger the plasticity or fluidity of the sample. The three samples (sample 1, 2 and 3) are processed as follows:
[0027] Sample 1: no treatment.
[0028] Sample 2: 0.08% by weight of soil anionic surfactant ("Sulfetal" (trademark) Cjot 160) and 0.04% of BNS ("Rheobuild" (trademark) 5500) were added to the soil.
[0029] Sample 3: Same as Sample 2, but with the addition of 0.01% polyethyleneoxide ("Polyox" (trademark) WSR-301).
[0030] This cone penetration experiment gave the following results:
[0032] In fact, sample 1 was very hard, and the addition of th...
Embodiment 2
[0034] Example using foaming ingredients.
[0035] Three more samples were tested, this time with extended tests according to the German standard DIN 18 555. The test consists of placing the specimen on a table top, which is then dropped and impacted. The extent to which the sample spreads after impact is a measure of the sample's fluidity - the greater the spread, the more fluid the sample. The three samples are processed as follows before falling:
[0036] Sample 1: no treatment.
[0037] Sample 2: Treatment with a foaming aqueous mixture of α-olefin sulfonate surfactant ("Rhodocal" (trademark) A-246-L) and BNS ("Rheobuild" 5500) resulted in the addition of 0.08% Surfactant and 0.04% BNS by weight.
[0038] Sample 3: As Sample 2, but with the addition of 0.01% by weight polyethyleneoxide ("Polyox" WSR-301).
[0039] The result is as follows:
[0040] Sample 1: 10.2 cm, sample 2: 15 cm, sample 3: 12.2 cm.
[0041]As in Example 1, the addition of surfactant and BNS mad...
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Abstract
A process of boring a tunnel using an earth-pressure balance shield boring tunnelling machine having a cutting head, an excavation chamber for soil removed by boring and conveying means for removal of said soil from the excavation chamber; wherein there is injected into a stratum being bored at the cutting head a foamed aqueous solution, characterised in that (a) the aqueous solution contains two essential components which are (i) a sulphate- or sulphonate-containing anionic surfactant, and (ii) beta -naphthalene sulphonate-formaldehyde condensate; and in that (b) there is applied to the soil removed by boring in at least one of the excavation chamber and the conveyor a second aqueous solution containing essentially a high molecular weight polyethyleneoxide and optionally a sulphate- or sulphonate-containing anionic surfactant. The process allows easy removal of soil from the cutting head to the excavation chamber and from the excavation chamber out of the machine. It is particularly effective for sticky soils with high proportions of clay and a high water content.
Description
technical field [0001] The present invention relates to tunnel boring and compositions used therein. Background technique [0002] Earth Pressure Balanced Shield Tunnel Boring Machine (EPBS), because of its many advantages, such as the ability to drill holes in various formations, is being used more and more frequently in the drilling of tunnels in non-rock formations. The EPBS consists of a rotating cutting head mounted on a cylindrical shield of similar diameter with its axis of rotation collinear with the longitudinal axis of the shield. The shield includes a mechanism for feeding material to the cutting head and a mechanism for removing soil. The soil then passes through the hole in the cutting head and then reaches the excavation cavity behind the cutting head, where it is carried away by a conveyor, usually a screw conveyor. [0003] EPBS works well in clay soils with good plastic properties, but is not so effective in other soils such as dense colloidal soils. One ...
Claims
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Application Information
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