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Construction method of self-compacting concrete rockfill dam

A technology of self-compacting concrete and construction method, which is applied in the direction of dams, barrages, and infrastructure engineering, etc., and can solve problems such as limited grouting speed, small amount of mortar distribution in the middle layer, and difficulty in rapid rockfilling with mechanical equipment

Active Publication Date: 2021-04-20
福建省水利水电工程局有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned prior art scheme has the following defects: although it has the advantage of faster construction speed of rockfill dams, it needs a large number of distribution grouting pipes in the construction process, and there are many restrictions on construction, mainly as follows: 1. It is difficult to use mechanical equipment for rapid rockfilling; 2. The depth and distribution density of the grouting pipes need strict requirements, otherwise there may be problems such as less mortar distribution in the middle layer and poor diffusion uniformity in the bottom layer; 3. The grouting depends on the grouting pipes, and the grouting speed Limited; the above problems will lead to insufficient efficiency of the entire construction process

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  • Construction method of self-compacting concrete rockfill dam

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Embodiment 1

[0051] Embodiment 1, with reference to figure 1 , is a kind of self-compacting concrete rockfill dam construction method disclosed by the present invention, comprising the following steps:

[0052] Step S1 The dam surface 3 is formed, and the outer contour of the dam surface 3 is formed by masonry with face stones;

[0053] Step S1.1 Pre-spread mortar with a thickness of a on the foundation surface, and form the outer contour of the dam surface 3 one by one with facing stones. The average interval between horizontally adjacent facing stones is b, where a=(1.3~1.7)b , after the face stone is built, it will sink to a certain extent, and should be hammered and shaken to make the seat slurry overflow and ensure compactness; the vertical seam mortar between the facing stones will be manually pounded and inserted, and the common tools include steel bar pounding rods and bamboo chips Tamping stick or pounding steel plate;

[0054] Step S1.2 After the first layer of masonry is compl...

Embodiment 2

[0071] Embodiment 2: The difference from Embodiment 1 is that the formwork is formed in step S1, and steel formwork, wooden formwork, etc. are used to build the outer contour of the dam surface, wherein the material of the steel formwork is Q235 steel or 16Mn steel, and the thickness of the panel is ≥ 4mm; The material of the formwork panel should be higher than that of II and other materials, and the thickness of the panel should be ≥ 4cm. Due to the high fluidity of self-compacting concrete, the formwork must be well sealed, and sealing strips must be pasted at the joints of the formwork to prevent grout leakage. At the same time, due to the high fluidity of the special self-compacting concrete, the side pressure of the formwork is also relatively large. Therefore, the support of the formwork must ensure stability, and its rigidity and strength must be able to resist the lateral pressure generated by self-compacting concrete. The actual calculation is based on 2.5 times the ...

Embodiment 3

[0072] Embodiment 3: as Image 6 and Figure 7As shown, the difference with Embodiment 1 is that step S1 includes step S1.3. A support 4 is erected between the top of the dam surface or between the dam surface and the mountain body, and the irrigation bag 5 is suspended on the support 4. The irrigation bag 5 Bottom is through, and the bag face of irrigation bag 5 offers a plurality of holes, and the aperture of the hole of the lower half of bag face is greater than the aperture of the hole of upper half, and the total area of ​​lower half hole is greater than the total area of ​​upper half hole. area; the top of the flushing bag 5 is equipped with a flushing port.

[0073] In step S2, the boulders form a natural rockfill body and at the same time naturally cover the irrigation bag 5, leaving the irrigation opening and part of the irrigation bag 5 on the top.

[0074] When the self-compacting concrete is poured into the warehouse in step S4, the position of the flushing bag 5...

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Abstract

The invention relates to a construction method of a self-compacting concrete rockfill dam, which comprises the following steps: S1 shaping the dam surface; S2 loading rough rocks into the dam; S3 pumping the self-compacting concrete to the dam; step S4 pouring the self-compacting concrete into the silo. The present invention optimizes multiple dimensions such as the rockfill method, stone particle size control, concrete water-binder ratio control, and grouting method, so that the self-compacting of concrete can be completed during the entire construction process without adding grouting pipes. Whether it is transportation, rockfill or pouring, all can be completed by mechanical equipment, and without the insertion of grouting pipes and precise pouring of grouting pipes, the flow rate of concrete in the rockfill body is high and the diffusion is fast, which greatly improves the construction of rockfill dams. efficiency.

Description

technical field [0001] The invention relates to the technical field of construction methods of rockfill dams, in particular to a construction method of self-compacting concrete rockfill dams. Background technique [0002] Rockfill dam is a kind of earth-rockfill dam, which is a dam built with stone material as the main body and anti-seepage body. Because rockfill dams have the advantages of being able to obtain local materials, being able to adapt to various topographic, geological and climatic conditions, and having a strong ability to resist high-intensity earthquakes, the construction and damming technology of rockfill dams have developed rapidly. [0003] There are several methods of building earth-rock dams in the prior art: 1) adopt the construction method of self-compacting concrete material building concrete dam, this method is mainly used in the dam body structure that building has bigger concrete anti-seepage body; 2) adopt composite The construction method of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B7/06E02D15/00
CPCE02B7/06E02D15/00
Inventor 王韶华涂启龙林建喜张志祥张剑敏
Owner 福建省水利水电工程局有限公司