Composite structure based on spoil recycling and construction method thereof

Abstract

The invention belongs to the technical field of civil engineering filling, and particularly relates to a composite structure based on spoil reutilization and a construction method of the composite structure. In the composite structure, engineering spoil is improved and reconstructed, spoil resources are utilized on site, the utilization rate of the spoil reaches 90% or above, and the construction cost is reduced. The land occupation of a spoil yard is obviously reduced, the comprehensive cost of digging and filling soil is reduced, and the method has good engineering performance and can be widely applied to various foundation projects; meanwhile, one part of the engineering spoil is used for manufacturing building blocks, the blocking structure is built through the building blocks, the other part of the engineering spoil is used for manufacturing the flow state solidified body, and then the flow state solidified body is poured into the filling area of the blocking structure, so that the overall performance of the composite structure is optimized, the construction precision is high, and operation is easy and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering filling, and in particular relates to a composite structure based on waste soil reuse and a construction method thereof. Background Art

[0002] With rapid economic development and the expansion of infrastructure construction, the amount of waste soil generated by construction projects has continued to grow. Current disposal solutions often employ a two-way transportation model: waste soil is transported to designated storage sites at the construction site, while standard sand, gravel, and soil are purchased from external sources for backfill. This model presents three significant problems: First, the extensive storage of waste soil leads to inefficient land use; second, the two-way transportation significantly increases construction transportation costs; and third, the dust pollution and carbon emissions generated during transportation have a cumulative negative impact on the ecological environment.

[0003] Therefore, a composite structure based on waste soil reuse and its construction method are proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a composite structure based on waste soil recycling and a construction method thereof to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A composite structure based on waste soil reuse, comprising:

[0007] A plugging structure, wherein at least one filling area is provided in the plugging structure;

[0008] a filling structure, arranged in the filling area;

[0009] The blocking structure includes blocks;

[0010] The filling structure includes a fluid solidified body;

[0011] The raw materials of the building blocks and the fluidized solidified body include construction waste.

[0012] A construction method for a composite structure based on waste soil recycling, for constructing the composite structure based on waste soil recycling, comprises the following steps:

[0013] S1. Soil preparation: crush the construction waste soil, dry it naturally, and pile it up for future use;

[0014] S2, preparing blocks: making blocks from the treated engineering waste;

[0015] S3. Construction of blocking structure: Use blocks to build the blocking structure;

[0016] S4, preparing a fluidized solidified body: preparing the treated engineering spoil into a fluidized solidified body;

[0017] S5. Pouring filling area: pouring the fluidized solidified body into the filling area and tamping it;

[0018] S6. Curing: Cover the filling area with a curing film, and remove the curing film after the fluidized solid body solidifies.

[0019] Preferably, in S2, the preparation method of the building block is:

[0020] The construction waste soil, water and cement-based cementitious materials are mixed according to the set ratio, the mixed materials are filled into the mold for curing and forming, and the blocks are obtained after demoulding.

[0021] Preferably, the compressive strength of the blocks is not less than 5 MPa.

[0022] Preferably, in S4, the preparation method of the fluidized solidified body is:

[0023] The engineering waste soil, water and cement-based cementitious materials are mixed in a set proportion to obtain a fluid solidified body.

[0024] Preferably, the slump of the fluidized solidified body is 18 to 22 cm, and the saturation of the fluidized solidified body is greater than 80%.

[0025] Preferably, in S1, the maximum particle size of the crushed construction waste soil is no more than 50 mm, and the moisture content of the soil particles after natural drying is no more than 10%.

[0026] Preferably, in S5, the fluidized solidified body is poured into the filling area in layers, and the pouring thickness of a single layer of the fluidized solidified body is 30 to 50 cm.

[0027] Compared with the prior art, the present invention has the following advantages and technical effects:

[0028] In the present invention, by improving and reconstructing the engineering spoil, the spoil resources are utilized on site, the spoil utilization rate reaches more than 90%, the land occupied by the spoil yard is significantly reduced, and the comprehensive cost of excavation and filling is reduced. At the same time, it has good engineering performance and can be widely used in various foundation projects; at the same time, a part of the engineering spoil is made into blocks, and the blocks are used to make a blocking structure, and the other part of the engineering spoil is made into a fluidized solid body, and then the fluidized solid body is poured into the filling area of ​​the blocking structure, thereby optimizing the overall performance of the composite structure, and having high construction precision and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0030] Figure 1 This is a schematic structural diagram of Example 1 of the present invention;

[0031] Figure 2 This is a schematic structural diagram of Example 2 of the present invention;

[0032] Figure 3 This is a schematic structural diagram of Example 3 of the present invention;

[0033] Among them, 1. Retaining wall; 11. Masonry blocks; 2. Filling area; 22. Fluidized solid body. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] Reference Figure 1 This embodiment discloses a composite structure based on waste soil reuse, comprising:

[0038] A plugging structure, wherein a filling area 2 is provided in the plugging structure;

[0039] The blocking structure is enclosed by a plurality of retaining walls 1, and the retaining walls 1 are built by blocks 11;

[0040] a filling structure, arranged in the filling area 2;

[0041] The blocking structure includes a block 11;

[0042] The filling structure includes a fluid solidified body 22;

[0043] The raw materials of the building blocks 11 and the fluidized solidified body 22 include construction waste.

[0044] In this embodiment, the height of the fluidized solidified body 22 in the filling area 2 is flush with the height of the retaining wall 1;

[0045] A construction method for a composite structure based on waste soil recycling, for constructing a composite structure based on waste soil recycling, comprising the following steps:

[0046] S1. Soil preparation: crush the construction waste soil, dry it naturally, and pile it up for future use;

[0047] S2, preparing blocks 11: making blocks 11 from the treated construction waste;

[0048] S3, construction of blocking structure: using blocks 11 to build the blocking structure;

[0049] S4, preparing a fluidized solidified body 22: preparing the treated engineering waste into a fluidized solidified body 22;

[0050] S5, pouring filling area 2: pouring the fluidized solidified body 22 into the filling area 2 and tamping it;

[0051] S6. Curing: Cover the filling area 2 with a curing film, and remove the curing film after the fluidized solidified body 22 solidifies.

[0052] The blocks 11 require mortar when building the retaining wall 1. The raw materials of the mortar are engineering spoil, cement-based cementitious materials, sand and water. An anti-seepage isolation layer is set on the inside of the retaining wall 1.

[0053] Further optimizing the solution, in S2, the preparation method of the building block 11 is: mixing the construction waste soil, water and cement-based cementitious material according to a set ratio, filling the mixed materials into a mold for curing and forming, and obtaining the building block 11 after demoulding.

[0054] According to a further optimization scheme, the compressive strength of the building block 11 is not less than 5 MPa.

[0055] Further optimizing the solution, in S4, the preparation method of the fluidized solidified body 22 is:

[0056] The engineering waste soil, water and cement-based cementitious materials are mixed according to a set ratio to obtain a fluidized solidified body 22.

[0057] The cement-based cementitious material includes 90% ordinary Portland cement and 10% 800 mesh ultrafine cement;

[0058] According to a further optimized solution, the slump of the fluidized solidified body 22 is 18 to 22 cm, and the saturation of the fluidized solidified body 22 is greater than 80%.

[0059] To further optimize the solution, in S1, the maximum particle size of the engineering waste soil after crushing is no more than 50 mm, and the moisture content of the soil particles after natural drying is no more than 10%.

[0060] According to a further optimized solution, in S5 , the fluidized solidified body 22 is poured into the filling area 2 in layers, and the pouring thickness of a single layer of the fluidized solidified body 22 is 30 to 50 cm.

[0061] Specific construction method:

[0062] Soil preparation: crush the engineering spoil and air dry it naturally. The maximum particle size of the crushed engineering spoil should not exceed 50mm, and the moisture content of the soil particles after air drying should not exceed 10%.

[0063] Preparation of building block 11: mixing construction waste with cement-based cementitious material and water, placing the mixed material in a mold, demolding after molding, and performing standard curing to obtain building block 11. Building block 11 has a size of 600×250×200 mm and a compressive strength of not less than 5 MPa;

[0064] By weight, the building block 11 includes 100 parts of engineering waste soil, 15 to 25 parts of cement-based cementitious materials, and 15 to 30 parts of water;

[0065] The cement-based cementitious material includes 90% ordinary Portland cement and 10% 800 mesh ultrafine cement;

[0066] Construction of retaining wall 1: Use blocks 11 to build retaining wall 1. During the construction process, the height of a single layer of masonry is controlled to be the height of a single block 11, which is 200mm. The wall of retaining wall 1 is staggered between two adjacent layers. After every three layers of sequential construction, one layer of D-mashing is inserted. The slope coefficient of the outer side of the wall is greater than that of the inner side of the wall; drainage holes are set on the wall.

[0067] Preparing the fluidized solidified body 22: mixing the engineering waste, cement-based cementitious material and water to obtain the fluidized solidified body 22;

[0068] The cement-based cementitious material includes 90% ordinary Portland cement and 10% 800 mesh ultrafine cement;

[0069] By weight, the fluidized solidified material 22 comprises 100 parts of construction waste, 10-20 parts of cement-based binder, and 30-60 parts of water. The fluidized solidified material 22 has a slump of 18-22 cm and a saturation greater than 80%. When applied to the surface layer of a railway subgrade, the saturated unconfined compressive strength at 7 days of application is no less than 700 kPa. When applied to a highway subgrade, the minimum bearing ratio (CBR) of the fluidized solidified material 22 is no less than 8%.

[0070] In addition to the basic conditions - slump and saturation, different application scenarios need to meet different strength requirements;

[0071] Construction of filling area 2: pour the fluidized solidified body 22 back into the middle filling area 2 in layers, control the thickness of each layer to 30-50cm, and use an inserted vibrator to assist in compaction;

[0072] Curing: The filling area 2 is covered with a curing film, which is removed after the fluidized solidified body 22 initially solidifies.

[0073] Example 2

[0074] Reference Figure 2 The difference between this embodiment and embodiment 1 is that the height of the fluidized solidified body 22 in the filling area 2 is lower than the height of the retaining wall 1; setting the height of the retaining walls 1 on both sides greater than the filling area 2 can enhance the lateral restraint force of the retaining wall 1, effectively disperse and resist the soil pressure from the filling area 2, and avoid local stress concentration or uneven settlement of the structure, which is particularly suitable for high filling or slope sites.

[0075] Example 3

[0076] Reference Figure 3 The difference between this embodiment and embodiment 1 and embodiment 2 is that a retaining wall 1 is added in the middle of the filling area 2 to divide the filling area 2 into multiple sections. There are multiple filling areas 2, forming a multi-level load transfer path, which can effectively enhance the anti-lateral displacement ability of the overall structure; in addition, the filling areas 2 of multiple sections can be constructed simultaneously, reducing the filling volume of a single section, and significantly reducing the maintenance difficulty of large-area casting of the fluidized solidified body 22.

[0077] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0078] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A composite structure based on waste soil recycling, characterized in that: include: A blocking structure, wherein at least one filling area (2) is provided in the blocking structure; A filling structure is arranged in the filling area (2); The blocking structure includes a building block (11); The filling structure includes a fluid solidified body (22); The raw materials of the building blocks (11) and the fluidized solidified body (22) include construction waste.

2. A construction method for a composite structure based on waste soil recycling, used to construct the composite structure based on waste soil recycling according to claim 1, characterized in that: Here are the steps: S1. Soil preparation: crush the construction waste soil, dry it naturally, and pile it up for future use; S2, preparing blocks (11): making blocks (11) from the treated engineering waste; S3, constructing the blocking structure: using blocks (11) to build the blocking structure; S4, preparing a fluidized solidified body (22): preparing the treated engineering waste into a fluidized solidified body (22); S5, pouring the filling area (2): pouring the fluidized solidified body (22) into the filling area (2) and tamping it; S6. Curing: Cover the filling area (2) with a curing film, and remove the curing film after the fluidized solidified body (22) solidifies.

3. The construction method of a composite structure based on waste soil recycling according to claim 2, characterized in that: In S2, the preparation method of the building block (11) is: The engineering waste soil, water and cement-based cementitious materials are mixed according to a set ratio, the mixed materials are filled into a mold for curing and forming, and the blocks (11) are obtained after demoulding.

4. The construction method of a composite structure based on waste soil recycling according to claim 2, characterized in that: The compressive strength of the building block (11) is not less than 5MPa.

5. The construction method of a composite structure based on waste soil recycling according to claim 2, characterized in that: In S4, the preparation method of the fluidized solidified body (22) is: The engineering waste soil, water and cement-based cementitious materials are mixed according to a set ratio to obtain a fluidized solidified body (22).

6. The construction method of a composite structure based on waste soil recycling according to claim 2, characterized in that: The slump of the fluidized solidified body (22) is 18-22 cm, and the saturation of the fluidized solidified body (22) is greater than 80%.

7. The construction method of a composite structure based on waste soil recycling according to claim 2, characterized in that: In S1, the maximum particle size of the engineering spoil after crushing is no more than 50 mm, and the moisture content of the soil particles after natural drying is no more than 10%.

8. The construction method of a composite structure based on waste soil recycling according to claim 2, characterized in that: In S5, the fluidized solidified body (22) is poured into the filling area (2) in layers, and the pouring thickness of a single layer of the fluidized solidified body (22) is 30 to 50 cm.

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