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Concrete face rockfill dam isolating layer construction method

A technology of concrete slab and construction method, which is applied in the direction of dams, barrages, and infrastructure engineering, etc., which can solve the problems of destroying the waterproofing and separation lubrication of the separation layer, the construction investment equipment is large, and the construction process is complex, etc., so as to achieve fast and efficient construction. The method is simple and the effect of improving the anti-seepage effect

Active Publication Date: 2018-12-11
GEZHOUBA GRP NO 2 ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common construction method of the isolation layer is to alternately spray asphalt and sand on the upstream protective surface to form a glue-sand mixed structure layer. To reach the design thickness, it must be sprayed multiple times, which consumes a lot of asphalt, requires a lot of construction equipment, and relatively long construction time , the construction process is relatively complicated. Due to the low bonding strength between the glue-sand mixed structure layer and the upstream armor, the later panel construction is likely to cause the isolation layer to fall off, destroying the secondary waterproof and separation lubrication of the separation layer

Method used

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  • Concrete face rockfill dam isolating layer construction method
  • Concrete face rockfill dam isolating layer construction method

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Embodiment 1

[0021] see figure 1 , the construction method of the isolation layer of the concrete face rockfill dam of the present embodiment 1 comprises the following steps:

[0022] (1) According to emulsified asphalt 150kg, water 120kg, cement 300kg ingredients:

[0023] (2) When the natural environment temperature is 28°C and the water temperature is 15°C, weigh 150kg of emulsified asphalt and 120kg of water according to the formula ratio and put them into the mixing tank, stir at 300-500 rpm for 2-3 minutes to mix the emulsified asphalt and water Uniform;

[0024] (3) Slowly add 300kg of cement into the emulsified asphalt and water mixture material that is well stirred in step (1) according to the formula ratio, and stir at 600-800 rpm for 3-5 minutes to make it fully mixed to form powder - emulsified asphalt mortar;

[0025] (4) Filter the fully mixed powder-emulsified asphalt mortar in step ((3) to remove the mortar residue, and keep stirring at a speed of 300-500 rpm to prevent ...

Embodiment 2

[0028] see figure 2 , the present embodiment 2 is basically the same as embodiment 1. The difference is that in step (2), put 120 kg of water and 300 kg of cement into the mixing tank in turn, and stir for 3-5 minutes at a speed of 600-800 rpm to mix the cement and water evenly; in step (3), emulsify Add asphalt to the well-stirred cement and water mixture in step (2), and stir at 300-500 rpm for 2-3 minutes to make it fully mixed to form a powder-emulsified asphalt mortar.

[0029] The construction method of the isolation layer of the concrete face rockfill dam of the present invention is preferably spraying 1.5-2 mm at a time. If the thickness is required to be greater than 2mm, perform secondary spraying before the asphalt is not demulsified and the cement is not set.

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Abstract

The invention provides a concrete face rockfill dam isolating layer construction method. The concrete face rockfill dam isolating layer construction method comprises the following steps of: (1) preparing powder-emulsified asphalt mortar on the scene; (2) filtering the powder-emulsified asphalt mortar to remove glue residues for later application, continuously stirring, and storing for 1.5 hours after stirring; and (3) conveying the powder-emulsified asphalt mortar to a working face through a conveying hose, spraying the powder-emulsified asphalt mortar onto a protective surface through a spraygun at the working pressure of 0.8-1.2MPa to form a semi-rigid isolating layer, and separating the protective surface from a concrete face by the semi-rigid isolating layer which has the effects of lubrication and seepage control. The face rockfill dam upstream protective surface isolating layer construction method is simplified; and the concrete face rockfill dam isolating layer construction method improves the gluing quality of the isolating layer and the protective surface, has a good effect of separating different layers and reduces the restraint stress of the face and the generation of concrete face cracks.

Description

technical field [0001] The invention relates to the construction field of concrete rockfill dams for water conservancy and hydropower, in particular to a construction method for forming a semi-rigid isolation layer between the upstream armor of a concrete face rockfill dam and face concrete. Background technique [0002] At present, the face protection of domestic concrete face rockfill dams adopts roller compacted mortar and extruded side walls, and an isolation layer is used between the concrete face face and the face protection. The common construction method of the isolation layer is to alternately spray asphalt and sand on the upstream protective surface to form a glue-sand mixed structure layer. To reach the design thickness, it must be sprayed multiple times, which consumes a lot of asphalt, requires a lot of construction equipment, and relatively long construction time , the construction process is relatively complicated. Due to the low bonding strength between the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B7/06E02D15/00C04B28/00C04B111/72
CPCC04B28/00C04B2111/00155C04B2111/72E02B7/06E02D15/00C04B24/36C04B22/002
Inventor 万海滨李龙江姚江涛张志浩
Owner GEZHOUBA GRP NO 2 ENG
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