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Heat insulation anchoring structure for water conservancy dam polyurea anti-seepage coatings and construction method

A technology of anti-seepage coating and anchoring structure, which is applied in the fields of moisturizing, heat preservation and anchorage structure and construction, water conservancy concrete dam seepage prevention and heat preservation, and can solve the problems of foam ice damage, foam cracking, bulging, and peeling, etc., with little impact , protection of thermal insulation effect, the effect of small thermal insulation effect

Inactive Publication Date: 2017-12-05
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to solve the problems that the prior art may cause polyurea in dam construction to peel off from the concrete base material, the problem of foam cracking and bulging; the problem of foam being destroyed by ice

Method used

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  • Heat insulation anchoring structure for water conservancy dam polyurea anti-seepage coatings and construction method
  • Heat insulation anchoring structure for water conservancy dam polyurea anti-seepage coatings and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A dam body anti-seepage insulation layer is designed as follows: the surface is sprayed with a polyurea anti-seepage layer with a thickness of 2mm, a thermal insulation anchor structure, a polyurethane thermal insulation foam with a thickness of 10mm, and an anti-ice layer with a thickness of 3mm. The construction process is the following steps:

[0045] Step 1. After cleaning the concrete base material of the dam body, use the inner wire at the bottom of the screw to fix the 120mm length and 42mm diameter screw (the fixed thread length at the lower end is 30mm) in the screw hole left by the concrete pouring formwork, and use tape to protect the upper half of the screw .

[0046] Step 2. Use polyurethane or epoxy cement to repair the gap between the screw rod and the dam body, and at the same time repair serious defects on the concrete surface of the dam body.

[0047] Step 3. Construct polyurea with a thickness of 2 mm on the dam body as an anti-seepage coating, and p...

Embodiment 2

[0054] An anti-seepage and thermal insulation layer of a dam body is designed as follows: thermal insulation anchor structure, polyurethane thermal insulation foam with a thickness of 80 mm, and an anti-icing layer with a thickness of 5 mm. The construction process is the following steps:

[0055] Step 1. After cleaning the concrete base material of the dam body, use the inner wire at the bottom of the screw to fix the 100mm length and 36mm diameter screw (the fixed thread length at the lower end is 30mm) in the screw hole left by the concrete pouring formwork, and use tape to protect the upper half of the screw .

[0056] Step 2. Use polyurethane or epoxy cement to repair the gap between the screw rod and the dam body, and at the same time repair serious defects on the concrete surface of the dam body.

[0057] Step 3. Spray hard polyurethane foam with a thickness of 35 mm on the polyurea.

[0058] Step 4. Remove the protective tape on the upper part of the screw, bind the ...

Embodiment 3

[0063] The anti-seepage and thermal insulation layer of the dam body is designed as follows: thermal insulation anchor structure, 60mm thick polyurethane thermal insulation foam. The construction process is the following steps:

[0064] Step 1. After cleaning the concrete base material of the dam body, use the inner wire at the bottom of the screw to fix the 80mm length and 36mm diameter screw (the lower end fixed thread length is 30mm) in the screw hole left by the concrete pouring formwork, and use tape to protect the upper half of the screw .

[0065] Step 2. Use polyurethane or epoxy cement to repair the gap between the screw rod and the dam body, and at the same time repair serious defects on the concrete surface of the dam body.

[0066] Step 3. Spray hard polyurethane foam with a thickness of 25 mm on the polyurea.

[0067] Step 4. Remove the protective tape on the upper part of the screw, bind the glass fiber reinforcement with a diameter of 4mm on the screw, and use...

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Abstract

The invention discloses a heat insulation anchoring structure for water conservancy dam polyurea anti-seepage coatings and a construction method. According to the heat insulation anchoring structure, a threaded rod with the length of 30-150mm is fixed into a screw hole reserved by a concrete casting template through an inner screw at the bottom of the threaded rod, a dam concrete substrate is coated with a polyurea layer, a rigid polyurethane foam with the thickness of 20-100mm is sprayed on the polyurea layer, a glass fiber rib with the diameter of 4-10mm is bound in an intersected manner on the surface of the foam by part of the exposed threaded rod, a tray rapidly covers a threaded rod body by the aid of a structure of the threaded rod body, the glass fiber rib presses on the surface of the rigid polyurethane foam, a rigid polyurethane foam with the thickness of 10-50mm is sprayed on the glass fiber rib and the tray and completely covers the threaded rod, the glass fiber rib and the tray, and an ice-resistant layer with the thickness of 2-6mm is constructed on the foam. The anchoring structure solves the problems of peeling of the polyurea anti-seepage coatings from the dam substrate and cracking, bulging and ice resisting of the heat insulation polyurethane foam.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to anti-seepage, heat preservation and moisture retention technologies of water conservancy concrete dams, that is, a heat preservation and anchoring structure and a construction method suitable for polyurea anti-seepage coatings of water conservancy dams. Background technique [0002] Most of the cracks produced by mass concrete such as dams are surface cracks. The main causes of surface cracks are drying shrinkage and temperature stress. The temperature stress is mainly the surface tensile stress caused by the increase of the temperature difference between the inside and outside of the mass concrete due to changes in the outside temperature such as cold waves and annual changes in the temperature in cold regions. Therefore, if appropriate and effective thermal insulation measures are adopted, the occurrence of concrete cracks will be greatly redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B3/16
CPCE02B3/16Y02A10/11
Inventor 路振刚王磊刘茂军李晓静孟继慧李济民王程鹏张峰石岩峰韩玲苗强
Owner STATE GRID CORP OF CHINA
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