CN211171814U

CN211171814U - Integrated check dam without management and protection

Info

Publication number: CN211171814U
Application number: CN201921773397.2U
Authority: CN
Inventors: 张金良; 苏茂林; 杨顺群
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-08-04
Anticipated expiration: 2029-10-22

Abstract

The utility model discloses a management-free and protection integrated silt dam, which comprises a homogeneous earth dam body, wherein a mixture protective layer with the thickness of 1.0-3.0 meters is arranged on the slope surfaces of an upstream dam and a downstream dam of the homogeneous earth dam body in order to improve the anti-scouring capacity of a protective slope; in order to timely discharge seepage water in the dam body, a plurality of layers of drainage blind pipes are embedded in the homogeneous earth dam body at intervals, and pipe orifices of the drainage blind pipes extend out of a downstream dam slope; the dam top of the homogeneous earth dam body is filled with a mixed material layer with the thickness of 2 meters, and the mixed material layer is connected with the mixed material protective layers paved on the surfaces of the upstream dam slope and the downstream dam slope into a whole. The utility model has the advantages that the construction of the siltation dam is convenient, the anti-scouring capability of the upstream and downstream dam slopes is increased, the dam body can overflow (over-standard flood can also be exceeded), further, the drainage building can be cancelled, and the construction cost of damming is greatly saved; meanwhile, due to the strong anti-scouring capability of the dam slope, the problem that the dam is easy to break when the silt dam passes over the over-standard flood is well solved, and meanwhile, the engineering management and protection task is simplified.

Description

Integrated check dam without management and protection

Technical Field

The utility model belongs to the technical field of check dam construction technique and specifically relates to a exempt from to manage and protect integral type check dam.

Background

In northwest loess plateau areas of China, gullies are vertical and horizontal, water and soil loss is serious, and a large number of silt dams are built in the gullies in order to intercept silt formed by water and soil loss. The arrangement of the siltation dams is generally that a series of step dams are respectively built on the furrows, the branch ditches and the main ditches according to the area of a channel watershed, and the building of the siltation dams has very important significance for lifting a channel erosion reference surface, preventing and controlling water and soil loss, retaining flood, blocking mud, silting land, reducing river sediment and the like, and is an important measure for comprehensive treatment of small watersheds.

The currently built silt dam consists of a dam and a water discharge building, wherein the dam is generally made of local materials and is built into a homogeneous earth dam, and the flood control standard is low. Due to the fact that the number of the silt dam is large, the silt dam is distributed and dispersed, the management and protection task is huge, and the flood prevention standard of the silt dam is low, the silt dam is easy to break and damage when the silt dam is turned over in case of exceeding standard flood in a flood season, the exceeding standard flood formed when the upstream silt dam breaks can threaten the downstream silt dam, and therefore chain reaction is formed. Therefore, the invention provides a silt dam which has strong anti-scouring capability, can exceed standard flood and is free from management and protection, and is particularly urgent and necessary.

Disclosure of Invention

An object of the utility model is to above-mentioned prior art has the defect, provides a exempt from to manage and protect integral type check dam that flood control standard is high, scour prevention destruction can the reinforce.

In order to achieve the above purpose, the utility model can adopt the following technical proposal:

exempt from to manage and protect integral type check dam, including the homogeneity earth dam body, for the antiscour ability that improves the bank protection the upper and lower reaches dam slope surface of homogeneity earth dam body is provided with the mixture inoxidizing coating of 1.0~3.0 meters thickness.

The thickness of the downstream protective layer is larger than that of the upstream protective layer because the downstream dam slope is subjected to continuous scouring of water flow, and generally, the thickness of the mixed material protective layer of the upstream dam slope is 1.0-1.5 meters, and the thickness of the mixed material protective layer of the downstream dam slope is 2.0-3.0 meters.

In order to timely discharge seepage water in the homogeneous earth dam body, a plurality of layers of drainage blind pipes are embedded in the homogeneous earth dam body at intervals, and pipe orifices of the drainage blind pipes extend out of a downstream dam slope.

And the distance between two adjacent layers of the drainage blind pipes is 3 meters.

The dam top of the homogeneous earth dam body is filled with a mixed material layer with the thickness of 2 meters, the mixed material layer is connected with the mixed material protective layers paved on the surfaces of the upstream dam slope and the downstream dam slope into a whole, the anti-scouring capacity of the upstream dam slope and the downstream dam slope is increased, the dam body can overflow (can also overflow beyond standard flood), further, a water release building can be cancelled, and the engineering investment of the dam body is greatly saved.

The utility model has the advantages of construction convenience, the cost of damming is low, and dam slope scour prevention ability is strong, has solved the problem that silt ground dam crossed super-standard flood and easily broke the dam well, has also simplified the engineering management and protection task simultaneously.

Drawings

Fig. 1 is a schematic structural view of the silt dam of the present invention.

Detailed Description

As shown in fig. 1, the integrated silt dam without management and protection of the utility model comprises a homogeneous earth dam 1 which is rolled and filled according to the conventional design section, in order to improve the erosion resistance of the dam slope, a mixture protective layer with the thickness of 1.0-1.5 m, namely an upstream slope protection layer 2, is arranged on the upstream slope surface of the homogeneous earth dam 1, and a mixture protective layer with the thickness of 2.0-3.0 m, namely a downstream erosion resistance layer 3, is arranged on the downstream slope surface; in order to ensure that the dam body can overflow and the dam cannot break when the overflow exceeds the standard flood, a mixed material layer 4 with the thickness of 2 meters is filled at the top of the homogeneous earth dam body 1, and the mixed material layer 4 is connected with the upstream slope protection layer 2 and the downstream anti-impact layer 3 into a whole; in order to discharge the seepage water in the dam body out of the dam body in time so as to increase the stability of the dam body, a plurality of layers of drainage blind pipes 5 are embedded in the homogeneous earth dam body 1 at intervals, generally, every 3 meters of the height of the dam body rises, namely, a layer of drainage blind pipe 5 is embedded in the dam body (the distance between two adjacent drainage blind pipes in the same layer is 3-5 meters), the drainage blind pipe 5 is arranged close to a downstream dam slope, and the pipe orifice of the drainage blind pipe extends out of the downstream dam slope.

The utility model discloses a exempt from to manage and protect integral type check dam's construction step as follows:

firstly, rolling and filling a dam body 1 of a homogeneous earth dam according to the design section of the homogeneous earth dam and a construction method;

secondly, uniformly mixing damming soil (loess) and a argillaceous powder fine sand consolidation agent (prepared by 70-80% of calcined argillaceous powder fine sand fine powder, 5-10% of mineral powder and 10-25% of cement by weight percentage) in a temporary mixing field at a construction site, uniformly mixing the mixture according to the weight ratio of 70-90: 10-30 into a mixture in the patent application of the invention (application No. 201811405697.5, application days 2018, 11 and 23)) and then conveying the mixture to the upstream and downstream dam slopes of the homogeneous dam body 1 of the first filling step for spreading, and synchronously rolling and constructing with the homogeneous dam body and lifting the homogeneous dam body; during specific construction, according to different heights of the dam body, the thickness of the upstream slope protection layer 2 is 1.0-1.5 meters, and the thickness of the downstream anti-impact layer 3 is 2.0-3.0 meters;

as the argillaceous powder fine sand consolidation agent is added into the damming soil, the strength of upstream and downstream dam slopes can be obviously improved (the strength is equivalent to C10-C15 concrete through tests), so that the anti-scouring capability and the comprehensive durability are improved, and the aim of no management and protection is fulfilled;

thirdly, embedding drainage blind pipes 5 (commercially available products) at intervals in the homogeneous earth dam body 1, wherein in general, when the height of the dam body rises by 3m, a layer of drainage blind pipes 5 are embedded in the dam body to reach a downstream dam slope, and the drainage blind pipes 5 can drain seepage water in the dam body out of the dam body in time so as to increase the stability of the dam body;

and fourthly, filling the dam with the same mixture as the upstream and downstream slope protection protective layers within the thickness range of 2m below the elevation of the dam crest, and connecting the formed mixture layer 4 with the upstream slope protection layer 2 and the downstream anti-impact layer 3 into a whole to finish the construction of the pipe-protection-free integrated silt dam.

Because the upstream dam slope, the downstream dam slope and the dam top are filled with the mixture formed by the damming soil and the argillaceous powder fine sand consolidation agent, the scouring resistance of the dam body is improved, the homogeneous earth dam body can overflow, the drainage building can be omitted, the investment is saved, and the overflow of the dam body can also exceed the standard flood.

Claims

1. The utility model provides a exempt from to manage and protect integral type check dam, includes the homogeneity earth dam body, its characterized in that: and the mixture protective layers with the thickness of 1.0-3.0 m are arranged on the slope surfaces of the upstream dam and the downstream dam of the homogeneous earth dam.

2. The maintenance-free integrated check dam according to claim 1, wherein: the thickness of the mixture protective layer of the upstream dam slope is 1.0-1.5 m, and the thickness of the mixture protective layer of the downstream dam slope is 2.0-3.0 m.

3. The maintenance-free integrated check dam according to claim 1, wherein: and a plurality of layers of drainage blind pipes are embedded in the homogeneous earth dam body at intervals, and pipe orifices of the drainage blind pipes extend out of a downstream dam slope.

4. The maintenance-free integrated check dam according to claim 3, wherein: and the distance between two adjacent layers of the drainage blind pipes is 3 meters.

5. The maintenance-free integrated check dam according to claim 1, wherein: the dam top of the homogeneous earth dam body is filled with a mixed material layer with the thickness of 2 meters, and the mixed material layer is connected with the mixed material protective layers paved on the surfaces of the upstream dam slope and the downstream dam slope into a whole.