Solid waste light slurry backfill material and recycling method

Abstract

The invention discloses a solid waste superfine powder grouting material for shield tunneling and a muck recycling method, and relates to the technical field of shield tunneling. The solid waste superfine powder grouting material for the shield comprises cement, fly ash, bentonite, a water reducing agent and shield muck serving as aggregate. The invention further discloses a muck recycling method based on the shield muck. The shield muck is shield muck generated in the tunneling process of a shield tunneling machine. Mixing the cement, the fly ash, the bentonite, the water reducing agent and the shield muck serving as the aggregate, stirring the mixture with water to form recycled slurry, and using the recycled slurry as a synchronous grouting material; the purposes of recycling the shield muck, reducing the use amount of field sandy soil and saving the cost are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunneling, in particular to a solid waste lightweight mud backfill material and a recycling method. Background Art

[0002] During the construction of urban rail transit, especially when the shield machine is excavating, a large amount of shield debris will be generated. The shield debris needs to be transported out, which not only pollutes the environment but also occupies a large amount of land for stacking.

[0003] Shield slag is a general term for engineering slag and engineering mud produced during shield tunneling, mainly including engineering slag with similar properties to the original stratum produced by the cutterhead in the earth pressure balance shield. Since a large amount of shield slag generated during shield construction needs to be properly handled and utilized, it is particularly necessary and urgent to carry out harmless treatment and resource utilization of shield slag.

[0004] Traditional backfill materials need to be mixed with cement, and the production of 1 ton of cement emits about 1 ton of carbon dioxide. If a new material is developed using solid waste resources to replace the traditional backfill process, it will not only solve the problem of solid waste utilization but also reduce carbon emissions. Summary of the invention

[0005] The purpose of the present invention is to provide a method for recycling shield slag and solid waste ultrafine powder grouting material, so as to achieve the purpose of recycling shield slag, reducing the amount of sand and soil used on site, and saving costs.

[0006] In order to achieve the above object, the present invention adopts the following technical means: A solid waste light mud backfill material comprises cement, solid waste fly ash, a foaming agent, desulfurized gypsum, a water reducing agent, slag and shield slag.

[0007] Preferably, in parts by weight, the cement comprises 80 to 120 parts, the solid waste fly ash comprises 200 to 300 parts, the desulfurized gypsum comprises 20 to 60 parts, the water reducing agent comprises 1 to 3 parts, the slag comprises 100 to 150 parts, and the shield slag comprises 300 to 400 parts.

[0008] Furthermore, in parts by weight, the cement comprises 100 parts, the solid waste fly ash comprises 150 parts, the desulfurized gypsum comprises 40 parts, the water reducing agent comprises 2 parts, the slag comprises 125 parts, and the shield slag comprises 350 parts.

[0009] Furthermore, a backfilling method based on solid waste light mud backfill material adopts the aforementioned solid waste light mud backfill material for reuse; The shield slag is the shield slag generated by the shield machine during the excavation process; The solid waste fly ash, desulfurized gypsum, slag and shield slag are mixed to form powder, and then the cement, foaming agent, water reducing agent and water are stirred to form recycling slurry, the powder is added to the slurry, and then backfilled into the cavity.

[0010] Preferably, the solid waste fly ash, desulfurized gypsum, slag and shield slag are first formed into dry powder before the cement, foaming agent and water reducing agent, and then the dry powder is mixed with cement slurry to prepare the reuse slurry.

[0011] Furthermore, in parts by weight, the cement comprises 80 to 120 parts, the solid waste fly ash comprises 200 to 300 parts, the desulfurized gypsum comprises 20 to 60 parts, the water reducing agent comprises 1 to 3 parts, the slag comprises 100 to 150 parts, and the shield slag comprises 300 to 400 parts.

[0012] Furthermore, in parts by weight, the cement is 100 parts, the solid waste fly ash is 150 parts, the desulfurized gypsum is 40 parts, the water reducing agent is 2 parts, the slag is 125 parts, and the shield slag is 350 parts.

[0013] The present invention has the following beneficial effects during use: Among them, shield mud, as aggregate, plays the role of skeleton, supports and fixes other components, thereby increasing the strength and stability of mortar. Cement, as a cementitious material, can firmly bond aggregates such as sand together through hydration reaction, thereby improving the strength and setting time of the specimen. Solid waste fly ash, as a cementitious material, reduces the amount of cement used, reduces the thermal reaction of cement hydration, and can improve the fluidity, cohesion, and water retention of concrete. Water reducer is used to reduce the amount of water used, improve the early strength of the specimen and shorten the setting time. Moreover, after the slurry is stirred and foamed, it can form a porous lightweight structure and be used as a lightweight backfill. This can solve the comprehensive utilization of coal thermal power solid waste, use less cement or even no cement, thereby saving resources and reducing pollution. Utilize on-site slag to reduce the amount of slag generated on the construction site. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0015] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0017] Example 1 A solid waste light mud backfill material comprises cement, solid waste fly ash, a foaming agent, desulfurized gypsum, a water reducing agent, slag and shield slag.

[0018] Preferably, in parts by weight, the cement comprises 100 parts, the solid waste fly ash comprises 150 parts, the desulfurized gypsum comprises 40 parts, the water reducing agent comprises 2 parts, the slag comprises 125 parts, and the shield slag comprises 350 parts.

[0019] Furthermore, a backfilling method based on solid waste light mud backfill material adopts the aforementioned solid waste light mud backfill material for reuse; The shield slag is the shield slag generated by the shield machine during the excavation process; The solid waste fly ash, desulfurized gypsum, slag and shield slag are mixed to form powder, and then the cement, foaming agent, water reducing agent and water are stirred to form recycling slurry, the powder is added to the slurry, and then backfilled into the cavity.

[0020] Preferably, the solid waste fly ash, desulfurized gypsum, slag and shield slag are first formed into dry powder before the cement, foaming agent and water reducing agent, and then the dry powder is mixed with cement slurry to prepare the reuse slurry.

[0021] Furthermore, in parts by weight, the cement is 100 parts, the solid waste fly ash is 150 parts, the desulfurized gypsum is 40 parts, the water reducing agent is 2 parts, the slag is 125 parts, and the shield slag is 350 parts.

[0022] In this way, the shield mud, as an aggregate, plays the role of a skeleton, supporting and fixing other components, thereby increasing the strength and stability of the mortar. Cement, as a cementitious material, can firmly bond aggregates such as sand together through hydration reaction, thereby improving the strength and setting time of the specimen. Solid waste fly ash as a cementitious material reduces the amount of cement used, reduces the thermal reaction of cement hydration, and can improve the fluidity, cohesion, and water retention of concrete. Water reducers are used to reduce the amount of water used, improve the early strength of the specimen, and shorten the setting time. Moreover, after the slurry is stirred and foamed, it can form a porous lightweight structure and be used as a lightweight backfill. This can solve the comprehensive utilization of coal thermal power solid waste, use less cement or even no cement, thereby saving resources and reducing pollution. Utilize on-site slag to reduce the amount of slag generated on the construction site.

[0023] Example 2 A solid waste light mud backfill material comprises cement, solid waste fly ash, a foaming agent, desulfurized gypsum, a water reducing agent, slag and shield slag.

[0024] Preferably, in parts by weight, the cement comprises 80 parts, the solid waste fly ash comprises 200 parts, the desulfurized gypsum comprises 20 parts, the water reducing agent comprises 1 part, the slag comprises 100 parts, and the shield slag comprises 300 parts.

[0025] Furthermore, a backfilling method based on solid waste light mud backfill material adopts the aforementioned solid waste light mud backfill material for reuse; The shield slag is the shield slag generated by the shield machine during the excavation process; The solid waste fly ash, desulfurized gypsum, slag and shield slag are mixed to form powder, and then the cement, foaming agent, water reducing agent and water are stirred to form recycling slurry, the powder is added to the slurry, and then backfilled into the cavity.

[0026] Preferably, the solid waste fly ash, desulfurized gypsum, slag and shield slag are first formed into dry powder before the cement, foaming agent and water reducing agent, and then the dry powder is mixed with cement slurry to prepare the reuse slurry.

[0027] Furthermore, in parts by weight, the cement is 80 parts, the solid waste fly ash is 200 parts, the desulfurized gypsum is 20 parts, the water reducing agent is 1 part, the slag is 100 parts, and the shield slag is 300 parts.

[0028] Among them, shield mud, as aggregate, plays the role of skeleton, supports and fixes other components, thereby increasing the strength and stability of mortar. Cement, as a cementitious material, can firmly bond aggregates such as sand together through hydration reaction, thereby improving the strength and setting time of the specimen. Solid waste fly ash, as a cementitious material, reduces the amount of cement used, reduces the thermal reaction of cement hydration, and can improve the fluidity, cohesion, and water retention of concrete. Water reducer is used to reduce the amount of water used, improve the early strength of the specimen and shorten the setting time. Moreover, after the slurry is stirred and foamed, it can form a porous lightweight structure and be used as a lightweight backfill. This can solve the comprehensive utilization of coal thermal power solid waste, use less cement or even no cement, thereby saving resources and reducing pollution. Utilize on-site slag to reduce the amount of slag generated on the construction site.

[0029] Example 3 A solid waste light mud backfill material comprises cement, solid waste fly ash, a foaming agent, desulfurized gypsum, a water reducing agent, slag and shield slag.

[0030] Preferably, in parts by weight, the cement comprises 120 parts, the solid waste fly ash comprises 300 parts, the desulfurized gypsum comprises 60 parts, the water reducing agent comprises 3 parts, the slag comprises 150 parts, and the shield slag comprises 400 parts.

[0031] Furthermore, a backfilling method based on solid waste light mud backfill material adopts the aforementioned solid waste light mud backfill material for reuse; The shield slag is the shield slag generated by the shield machine during the excavation process; The solid waste fly ash, desulfurized gypsum, slag and shield slag are mixed to form powder, and then the cement, foaming agent, water reducing agent and water are stirred to form recycling slurry, the powder is added to the slurry, and then backfilled into the cavity.

[0032] Preferably, the solid waste fly ash, desulfurized gypsum, slag and shield slag are first formed into dry powder before the cement, foaming agent and water reducing agent, and then the dry powder is mixed with cement slurry to prepare the reuse slurry.

[0033] Furthermore, in parts by weight, the cement is 120 parts, the solid waste fly ash is 300 parts, the desulfurized gypsum is 60 parts, the water reducing agent is 3 parts, the slag is 150 parts, and the shield slag is 400 parts.

[0034] Among them, shield mud, as aggregate, plays the role of skeleton, supports and fixes other components, thereby increasing the strength and stability of mortar. Cement, as a cementitious material, can firmly bond aggregates such as sand together through hydration reaction, thereby improving the strength and setting time of the specimen. Solid waste fly ash, as a cementitious material, reduces the amount of cement used, reduces the thermal reaction of cement hydration, and can improve the fluidity, cohesion, and water retention of concrete. Water reducer is used to reduce the amount of water used, improve the early strength of the specimen and shorten the setting time. Moreover, after the slurry is stirred and foamed, it can form a porous lightweight structure and be used as a lightweight backfill. This can solve the comprehensive utilization of coal thermal power solid waste, use less cement or even no cement, thereby saving resources and reducing pollution. Utilize on-site slag to reduce the amount of slag generated on the construction site.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A solid waste light mud backfill material, characterized in that: Including cement, solid waste fly ash, foaming agent, desulfurization gypsum, water reducing agent, slag and shield slag.

2. The solid waste light mud backfill material according to claim 1, characterized in that: In parts by weight, the cement comprises 80 to 120 parts, the solid waste fly ash comprises 200 to 300 parts, the desulfurized gypsum comprises 20 to 60 parts, the water reducing agent comprises 1 to 3 parts, the slag comprises 100 to 150 parts, and the shield slag comprises 300 to 400 parts.

3. The solid waste light mud backfill material according to claim 2, characterized in that: In parts by weight, the cement comprises 100 parts, the solid waste fly ash comprises 150 parts, the desulfurized gypsum comprises 40 parts, the water reducing agent comprises 2 parts, the slag comprises 125 parts, and the shield slag comprises 350 parts.

4. A backfilling method based on solid waste light mud backfill material, characterized in that: Reusing the solid waste light mud backfill material according to any one of claims 1 to 3; The shield slag is the shield slag generated by the shield machine during the excavation process; The solid waste fly ash, desulfurized gypsum, slag and shield slag are mixed to form powder, and then the cement, foaming agent, water reducing agent and water are stirred to form recycling slurry, the powder is added to the slurry, and then backfilled into the cavity.

5. The method for recycling shield tunneling slag according to claim 4 is characterized in that: The solid waste fly ash, desulfurized gypsum, slag and shield slag are first formed into dry powder before the cement, foaming agent and water reducing agent, and then the dry powder is mixed with cement slurry to prepare the reuse slurry.

6. A method for recycling shield tunneling slag according to claim 4 or 5, characterized in that: In parts by weight, the cement comprises 80 to 120 parts, the solid waste fly ash comprises 200 to 300 parts, the desulfurized gypsum comprises 20 to 60 parts, the water reducing agent comprises 1 to 3 parts, the slag comprises 100 to 150 parts, and the shield slag comprises 300 to 400 parts.

7. The method for recycling shield tunneling slag according to claim 6 is characterized in that: In parts by weight, the cement comprises 100 parts, the solid waste fly ash comprises 150 parts, the desulfurized gypsum comprises 40 parts, the water reducing agent comprises 2 parts, the slag comprises 125 parts, and the shield slag comprises 350 parts.