CN216892257U

CN216892257U - Structure is backfilled in environmental protection ecotype land area

Info

Publication number: CN216892257U
Application number: CN202123227376.0U
Authority: CN
Inventors: 孙龙; 顾宽海; 王媛; 李海玲
Original assignee: CCCC Third Harbor Consultants
Current assignee: CCCC Third Harbor Consultants
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-07-05
Anticipated expiration: 2031-12-21

Abstract

The utility model belongs to the technical field of land area forming engineering, and discloses an environment-friendly ecological land area backfilling structure. The utility model can meet the requirements of various offshore environments and upper use facilities, and the main engineering and the foundation treatment are both constructed on land, so that the construction efficiency is higher; the thickness of the waste soil backfill layer is not limited, a large amount of inert building waste is utilized, waste is changed into valuable, mountain opening and offshore dredging sand taking are avoided, the ecological environment is friendly, the ecological requirement of the current urban development is better met, and the application prospect is wide; adopt the waste soil material to backfill, for traditional sea sand and riprap backfill structure, possess the condition of plant deep-seated cultivation, have the carrier of ecological development.

Description

Structure is backfilled in environmental protection ecotype land area

Technical Field

The utility model relates to the technical field of land formation engineering, in particular to an environment-friendly ecological land backfill structure.

Background

In recent years, the land backfilling is a key part for sea reclamation and is a key component of various water conservancy and water transportation engineering, the national control on the sea reclamation engineering is more and more strict due to the damage of large-scale sand measurement on marine ecological environment by land backfilling, the effective coordination of environmental protection and engineering safety must be realized under a new macroscopic background, and simultaneously, a newly formed land structure must have a carrier condition for ecological development. In recent years, along with the increasing attention of society to ecological environment, the influence of a large amount of mountain-opening stone-taking and marine dredging sand-taking on the environment is large, the activities are severely limited, a large amount of waste soil is generated in urban infrastructure, and the trend of ecological environmental protection in the future is realized by adopting the waste soil to fill land areas.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an environment-friendly ecological land backfilling structure which is suitable for backfilling land areas by waste soil materials, avoids mountain excavation and sand fetching in marine dredging, is friendly to ecological environment, better meets the ecological requirement of current urban development and has wide application prospect.

The technical problem solved by the utility model can be realized by adopting the following technical scheme:

in one aspect, the utility model provides an environment-friendly ecological land backfilling structure, wherein a sea sand cushion layer is laid on the lower portion, a waste soil backfill layer is laid in the middle portion, and a sea sand stress cushion layer is laid on the upper portion, the waste soil backfill layer is backfilled by waste soil, and composite geotextile is laid between the sea sand cushion layer and the waste soil backfill layer.

As a preferable scheme, the reinforced soil body is laid below the sea sand cushion layer, and a plastic waterproof board, a sand pile, a gravel pile, a stirring pile or a cement fly ash gravel pile is arranged inside the sea sand cushion layer and the reinforced soil body for reinforcement.

As a preferred scheme, the thickness of the sea sand cushion layer is 2-3 m.

As a preferred scheme, the sea sand stress cushion layer is 0.5-2.5 m.

Preferably, the particle size of the waste soil is less than 90 mm.

As a preferable scheme, the plasticity index I of the waste soil material_pNot greater than 16.

Preferably, the waste soil material comprises impurities, and the weight ratio of the impurities is not more than 2%.

Preferably, the waste soil material comprises floaters, and the weight ratio of the floaters is not more than 0.1%.

Compared with the prior art, due to the adoption of the technical scheme, the utility model has the following beneficial technical effects:

1) the method can not only meet the requirements of various offshore environments and upper use facilities, but also has higher construction efficiency because main engineering and foundation treatment are both onshore construction;

2) the thickness of the waste soil backfill layer is not limited, a belt conveyor conveying and loader uploading process can be adopted, the waste soil backfill layer makes a large amount of inert building waste, waste is changed into valuable, mountain opening and offshore dredging sand taking are avoided, the ecological environment is friendly, the ecological requirement of the current urban development is better met, and the application prospect is wide;

3) because the waste soil material backfill layer adopts waste soil material backfill, compared with the traditional sea sand and riprap backfill structure, the method has the condition of deep cultivation of plants and a carrier for ecological development.

Drawings

FIG. 1 is a sectional view of the backfill structure of the land area with environmental protection and ecology provided by the utility model.

The reference numerals include:

1. a sea sand cushion layer; 2. a waste soil backfill layer; 3. sea sand stress cushion layer; 4. compounding geotextile; 5. reinforcing the soil body; 6. plastic waterproof board or sand pile or gravel pile or mixing pile or cement fly ash gravel pile.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further explained in the following by combining the attached drawings and the specific embodiments.

As shown in fig. 1: the utility model provides an environmental protection ecotype land area backfill structure, sea sand bed course 1 is laid to the lower part, abandonment soil material backfill layer 2 is laid at the middle part, sea sand stress bed course 3 is laid on upper portion, abandonment soil material backfill layer 2 adopts the abandonment soil material to backfill, lays compound geotechnological cloth 4 between sea sand bed course 1 and abandonment soil material backfill layer 2.

The environment-friendly ecological land backfilling structure provided by the utility model can not only adapt to various offshore environments and the requirements of upper use facilities, but also has higher construction efficiency because main engineering and foundation treatment are both onshore construction; the thickness of the waste soil backfill layer 2 is not limited, a belt conveyor conveying and loader uploading process can be adopted, a large amount of inert building waste is utilized by the waste soil backfill layer 2, waste is changed into valuable, mountain opening and sand fetching during offshore dredging are avoided, the ecological environment is friendly, the ecological requirements of the current urban development are better met, and the application prospect is wide; on the other hand, because the waste soil backfill layer 2 adopts waste soil to backfill, compared with the traditional sea sand and riprap backfill structure, the waste soil backfill layer has the condition of deep cultivation of plants and a carrier for ecological development.

As shown in fig. 1: as a preferable scheme, the sea sand cushion layer 1 is laid horizontally on a reinforced soil body 5, plastic waterproof boards, sand piles, gravel piles, stirring piles or cement fly ash gravel piles 6 are arranged inside the sea sand cushion layer 1 and the reinforced soil body 5 for reinforcement, the upper sea sand cushion layer 1 serves as a construction platform and penetrates through the sea sand cushion layer 1 to treat a lower soft layer foundation, and land construction is efficient and rapid.

As shown in fig. 1: as a preferred scheme, the thickness of the sea sand cushion layer 1 is 2-3 m, and the sea sand cushion layer 1 is mainly used as a land construction platform of a middle waste soil backfill layer 2 and has a land construction platform for treating a lower weak layer foundation.

As shown in fig. 1: preferably, the sea sand stress cushion layer 3 is 0.5-2.5 m, the sea sand stress cushion layer 3 is backfilled by sea sand, impact rolling is carried out, and the sea sand stress cushion layer is used as an upper use facility stress cushion layer, so that the land structure is suitable for a series of high-standard upper use facilities such as ports, airports, roads and the like.

Preferably, the particle size of the waste soil is less than 90mm, the waste soil has good particle size distribution, and the nonuniform coefficient Cu is d60/d10 is more than or equal to 5. Wherein: on the cumulative particle size curve, d10 is the particle size at 10% sieve weight and d60 is the particle size at 60% sieve weight.

As a preferred scheme, the waste soil comprises impurities, the weight ratio of the impurities is not more than 2%, and the impurities can be steel bars, wood plates, iron wires and glass.

Preferably, the waste soil material comprises floaters, the weight ratio of the floaters is not more than 0.1%, the floaters can be packaging paper bags of building materials, but the surface of the waste soil material 4 cannot contain the floaters visible to the naked eyes.

In addition, the waste soil must not contain substances prohibited from disposal at sea in the annex of 1972 convention of London; must not contain materials listed in the national list of prohibited imports or national hazardous wastes; materials listed by sundries such as pond sludge, household garbage, industrial and chemical waste, animal and plant residues, fishing nets, ropes and the like can not be used as the backfill material for the embankment. The waste soil takes the second category (sediment classification) of ocean sediment quality as the inspection standard; if the detected value of the sample is larger than the second type (sediment classification) limit value, a dissolution test is required, and when the detected value of the dissolution test does not exceed the maximum acceptable limit value of the bearing water body, the waste soil material of the batch can be used as a embankment backfill material.

The construction operation flow of the environment-friendly ecological land backfill structure provided by the utility model is as follows:

s1, determining the standard of the waste soil material on the basis of a large number of tests, detecting physical and chemical indexes of the waste soil material according to the determined waste soil material standard, and performing related tests to determine mechanical calculation indexes;

s2, determining design parameters of the whole land backfilling structure such as sea sand stress cushion layer 3, sea sand cushion layer 1 thickness, sea sand stress cushion layer 3 elevation, geotextile material specification and the like according to the local hydrological conditions of the engineering area and the upper facility use standard;

s3, constructing the lower sea sand cushion layer 1 by adopting a hydraulic reclamation process;

and S4, performing foundation treatment by using the sea sand cushion layer 1 at the lower part as a land construction platform to form a reinforced soil body 5.

S5, laying the composite geotextile 4 on land;

s6, backfilling the middle waste soil material backfill layer 2 by adopting a belt conveyor and loader uploading process on land;

and S7, constructing the sea sand stress cushion layer 3 on the upper part on land, and performing impact rolling.

In summary, it can be seen that: by using the environment-friendly ecological land backfill structure provided by the utility model, the application requirements of various offshore environments and upper use facilities can be ensured due to accurate accounting and strict verification on the performance of backfill materials, and the construction efficiency is higher because the laying of the sea sand cushion layer 1, the treatment of the lower foundation, the laying of the composite geotextile 4, the backfill of waste soil materials, the laying and the treatment of the sea sand stress cushion layer 3 are all onshore construction; the thickness of the waste soil backfill layer 2 is not limited, a belt conveyor conveying and loader uploading process can be adopted, a large amount of inert building waste is utilized by the waste soil backfill layer 2, waste is changed into valuable, mountain opening and sand fetching during offshore dredging are avoided, the ecological environment is friendly, the ecological requirements of the current urban development are better met, and the application prospect is wide; on the other hand, because the waste soil backfill layer 2 adopts waste soil to backfill, compared with the traditional sea sand and riprap backfill structure, the waste soil backfill layer has the condition of deep cultivation of plants and a carrier for ecological development.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a structure is backfilled to environmental protection ecotype land territory which characterized in that: laying a sea sand cushion layer on the lower part, laying a waste soil backfill layer in the middle part and laying a sea sand stress cushion layer on the upper part, backfilling the waste soil backfill layer by waste soil, and laying composite geotextile between the sea sand cushion layer and the waste soil backfill layer.

2. The environmentally friendly ecotypic land backfill structure according to claim 1, characterized by: the sea sand cushion layer is laid below the reinforced soil body, and a plastic waterproof plate, a sand pile, a gravel pile, a stirring pile or a cement fly ash gravel pile is arranged inside the sea sand cushion layer and the reinforced soil body for reinforcement.

3. The environmentally friendly ecotypic land backfill structure according to claim 1, characterized by: the thickness of the sea sand cushion layer is 2-3 m.

4. The environmentally friendly ecotypic land backfill structure according to claim 1, characterized by: the sea sand stress cushion layer is 0.5-2.5 m.

5. The environmentally friendly ecotypic land backfill structure according to claim 1, characterized by: the particle size of the waste soil is less than 90 mm.

6. The environmentally friendly ecotypic land backfill structure according to claim 1, characterized by: plasticity index I of waste soil_pNot greater than 16.