阅读说明：本技术 泥水盾构压滤泥饼再造浆施工方法 (Slurry shield filter-pressing mud cake re-slurrying construction method ) 是由 陈时光 缪茂秋 芮志卿 陈啸宇 黄天宇 李念国 何伟 唐立宪 马伟 骆小芳 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种泥水盾构压滤泥饼再造浆施工方法,利用泥水盾构机在粘性地质层掘进产生的泥浆压滤获得粘性土泥饼以用于泥水盾构机在砂砾或岩层掘进施工,粘性土造浆能力强,将弃浆压滤成泥饼,在砂砾层岩层再造浆,减少膨润土成本、降低废浆、泥饼外运成本。本发明解决了现有泥水加压盾构工法分离产生的泥土及泥浆水,使用车辆外运泥土存在运输成本高的问题。(The invention discloses a mud-water shield filter-pressing mud cake re-slurrying construction method, which is characterized in that mud generated by the driving of a mud-water shield machine in a viscous geological formation is utilized to filter-press to obtain a viscous soil mud cake for the driving construction of the mud-water shield machine in gravel or rock stratum, the slurry-making capability of the viscous soil is strong, waste slurry is filter-pressed into the mud cake, slurry is re-slurried in the rock stratum of the gravel layer, the cost of bentonite is reduced, and the cost of waste slurry and mud cake outward transportation is reduced. The invention solves the problem that the existing slurry-water pressurizing shield construction method has high transportation cost because the vehicle is used for transporting the soil outside the vehicle to separate the generated soil and the slurry water.)

1. A construction method for mud cake re-slurrying by mud shield filter pressing is characterized by comprising the following steps:

carrying out filter pressing on slurry generated by tunneling in a cohesive soil stratum by a slurry shield machine to obtain a cohesive soil mud cake;

crushing the clay mud cake to obtain clay mud powder;

when the slurry shield machine tunnels into a sand layer or a rock stratum, preparing the clay mud powder, sodium carboxymethylcellulose, sodium carbonate and water to obtain regenerated slurry;

and conveying the regenerated slurry to a slurry bin of the slurry shield machine for the slurry shield machine to tunnel in the sand layer or the rock stratum.

2. The slurry shield filter-pressing mud cake re-slurrying construction method as claimed in claim 1, wherein the step of crushing the clay mud cake to obtain clay mud powder comprises crushing the clay mud cake and airing to obtain the clay mud powder.

3. The slurry shield filter-pressing mud cake re-slurrying construction method according to claim 1, wherein the mixing ratio of the regenerated mud is clay mud powder: sodium carboxymethylcellulose: sodium carbonate: 400kg of water: 2.2 kg: 11 kg: 870 kg.

4. The slurry shield filter-pressing mud cake re-slurrying construction method according to claim 3, wherein the specific gravity of the regenerated mud is 1.1-1.20.

5. The slurry shield filter-pressing mud cake re-slurrying construction method as claimed in claim 4, wherein the viscosity of the regenerated slurry is 20-30 ", the sand content of the regenerated slurry is 15-25%, the water precipitation amount of the regenerated slurry is 5%, and the pH value of the regenerated slurry is 8.

6. The mud shield filter-pressing mud cake re-slurrying construction method as claimed in claim 1, wherein the regenerated mud is obtained after preparation, conveyed into a mud inlet tank and conveyed into the mud sump through a mud circulation system.

Technical Field

The invention relates to the technical field of shield construction, in particular to a mud shield filter-pressing mud cake re-slurrying construction method.

Background

The slurry balance shield is characterized in that slurry meeting the construction requirement pressure is injected into a sealed cabin formed between a cutting cutter head and a partition plate, so that a mud film is formed on an excavation surface, a front soil body is supported, the mud film on the surface layer of the soil body is cut by the cutter head arranged on the front surface, the slurry enters the sealed cabin from the opening of the cutter head and is mixed with slurry to form high-density slurry, and the high-density slurry is conveyed to the ground by a sludge discharge pump and a pipeline for treatment.

The existing slurry pressure shield construction method is that slurry with various performance indexes reasonably adjusted enters a working bin of a shield machine through fluid conveying equipment and has certain pressure and flow, is mixed with soil cut by a cutter head and then is discharged, and is conveyed to slurry water treatment equipment through the fluid conveying equipment to separate the soil and slurry water. Soil is transported away by vehicles on a construction site, and the problem of high cost of transporting soil slurry outside exists.

Disclosure of Invention

In order to overcome the defects in the prior art, a mud-water shield filter-pressing mud cake re-slurrying construction method is provided so as to solve the problem that the transportation cost is high when a vehicle is used for transporting away the mud and muddy water generated by the existing mud-water pressurizing shield construction method.

In order to realize the purpose, the construction method for re-slurrying the mud cake through filter pressing of the slurry shield comprises the following steps:

carrying out filter pressing on slurry generated by tunneling in a cohesive soil stratum by a slurry shield machine to obtain a cohesive soil mud cake;

crushing the clay mud cake to obtain clay mud powder;

when the slurry shield machine tunnels into a sand layer or a rock stratum, preparing the clay mud powder, sodium carboxymethylcellulose, sodium carbonate and water to obtain regenerated slurry;

and conveying the regenerated slurry to a slurry bin of the slurry shield machine for the slurry shield machine to tunnel in the sand layer or the rock stratum.

Further, the step of crushing the clay mud cake to obtain clay mud powder comprises crushing the clay mud cake and airing to obtain the clay mud powder.

Further, the mixing ratio of the regenerated mud is clay mud powder: sodium carboxymethylcellulose: sodium carbonate: 400kg of water: 2.2 kg: 11 kg: 870 kg.

Furthermore, the specific gravity of the regenerated slurry is 1.1-1.20.

Furthermore, the viscosity of the regeneration slurry is 20-30', the sand content of the regeneration slurry is 15-25%, the water precipitation amount of the regeneration slurry is 5%, and the pH value of the regeneration slurry is 8.

Further, the regenerated slurry is obtained after being prepared, and is conveyed into a slurry inlet pool and conveyed into the slurry bin through a slurry circulation system.

The slurry shield filter-pressing mud cake re-slurrying construction method has the beneficial effects that the slurry generated by the slurry shield machine in the tunneling of the viscous geological layer is utilized to filter-press the obtained viscous soil mud cake for the tunneling construction of the slurry shield machine in the gravel or rock stratum, the slurry making capability of the viscous soil is strong, the waste slurry is filter-pressed into the mud cake, the slurry is re-slurried in the rock stratum of the gravel layer, the bentonite cost is reduced, the outward transportation cost of the waste slurry and the mud cake is reduced, the low carbon and environmental protection effects are realized, the zero emission of the waste slurry mud cake is realized, and the environment-friendly construction is realized.

Detailed Description

The present application will be described in further detail with reference to examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.

The invention provides a slurry reconstruction construction method for filter-pressed mud cakes of a slurry shield, which comprises the following steps:

s1: and (3) carrying out filter pressing on slurry generated by tunneling in the cohesive soil stratum by the slurry shield machine to obtain a cohesive soil mud cake.

S2: and crushing the clay mud cake to obtain clay mud powder.

Specifically, the clay mud powder is obtained by crushing, transferring and airing the clay mud cakes. Storing the clay mud powder for later use.

S3: when the slurry shield machine tunnels into a sand layer or a rock stratum, clay mud powder, sodium carboxymethyl cellulose, sodium carbonate and water are prepared to obtain regenerated slurry.

In a preferred embodiment, the mixing ratio of the regenerated slurry is clay powder: sodium carboxymethylcellulose: sodium carbonate: 400kg of water: 2.2 kg: 11 kg: 870 kg.

Wherein the specific gravity of the regenerated slurry is 1.1-1.20.

The viscosity of the regenerated slurry is 20-30'.

The sand content of the regenerated slurry is 15-25%.

Water precipitation of the regenerated slurry: 5 percent.

PH of the regenerated slurry: 8.

s4: and conveying the regenerated slurry to a slurry bin of the slurry shield machine for the slurry shield machine to tunnel in a sand layer or a rock stratum.

After preparing the regenerated slurry, conveying the regenerated slurry to a slurry inlet tank;

and the slurry circulation system of the slurry shield machine conveys the regenerated slurry in the slurry inlet pool to a slurry bin of the slurry shield machine for the slurry shield machine to tunnel in a sand layer or a rock stratum.

The slurry shield filter-pressing mud cake re-slurrying construction method provided by the invention has the advantages that the slurry generated by the slurry shield machine in the tunneling of the viscous geological formation is utilized to filter-press to obtain the viscous soil mud cake for the slurry shield machine in the tunneling construction of gravel or rock strata, the slurry making capability of the viscous soil is strong, the waste slurry is filter-pressed into the mud cake, the slurry is re-slurried in the rock stratum of the gravel layer, the bentonite cost is reduced, the waste slurry and mud cake outward transportation cost is reduced, the low carbon and environmental protection effects are realized, the zero emission of the waste slurry mud cake is realized, and the environment-friendly construction is realized. The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed.

It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.