Dam foundation reinforcement frame structure and dam foundation reinforcement method

A frame structure and dam foundation technology, which is applied in basic structure engineering, construction, etc., can solve the problems of low strength, dam foundation settlement control, insufficient anti-slip stability of dam slope, small pile diameter, etc., so as to improve stability and improve dam foundation settlement control. and dam slope anti-sliding stability performance

Active Publication Date: 2013-07-10
POWERCHINA ZHONGNAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for high-pressure rotary grouting piles, for fibrous and dense humus and silt soils, the pile diameter is usually small and the strength is low after pile formation, which is insufficient in the aspects of dam foundation settlement control and dam slope anti-sliding stability.

Method used

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  • Dam foundation reinforcement frame structure and dam foundation reinforcement method
  • Dam foundation reinforcement frame structure and dam foundation reinforcement method
  • Dam foundation reinforcement frame structure and dam foundation reinforcement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A dam foundation reinforcement frame structure, comprising a plurality of pile bodies 4 whose main body is arranged in the soft foundation 5 of the dam foundation, the bottom ends of the pile bodies 4 reach the boundary line 6 of the rock foundation, and the top ends exceed the ground line 2, and the pile bodies exceed the ground The part outside the line is the laitance section 3 that can be chiseled out; at least one reinforcement 7 is provided in the pile body, and the bottom section of the reinforcement exceeds the rock foundation boundary line 6, and the top exceeds the ground line 2; the laitance section can be chiseled through 3 and the reinforcing piece 7 fixedly connect the concrete grid beam 8 .

[0030] Both the tops of the pile body 4 and the reinforcement 7 exceed the ground line by more than 0.3m; the bottom of the reinforcement 7 exceeds the boundary line of the rock foundation by more than 0.2m. The pile body 4 is a high-pressure rotary spraying pile bod...

Embodiment 2

[0032] A dam foundation reinforcement method, the specific construction method is as follows:

[0033] (1) Use a high-jet grouting machine to spray cement slurry into piles. The top elevation of the high-pressure rotary jet grouting should be 0.3m higher than the ground, so that the laitance of the pile head can be cut off later, and the weak parts of the pile body can be removed. The bottom elevation of high-pressure jet grouting to the bedrock boundary.

[0034] (2) Before the initial setting of the cement slurry, start the vibration mode of the high-jet grouting machine, and quickly lower the steel pipe into the high-pressure jet grouting pile.

[0035] (3) When reaching the bedrock boundary, due to the high resistance of the bedrock, the vibrating frequency can be increased according to the actual situation. Generally, the vibrating frequency is controlled at 20HZ~40HZ.

[0036] (4) Drive the steel pipe into the bedrock 0.2m, so as to improve the stability of the pile by...

Embodiment 3

[0039] Example 3: Application

[0040] The dam foundation reinforcement frame structure of the present invention has been used in a pumped storage power station. The homogeneous earth dam crest elevation of the reservoir under the power station is 24.4m, the reservoir bottom elevation is -2.0m, the normal storage level elevation is 19.0m, and the stagnant water level elevation is 0m.

[0041] The geological conditions of the lower reservoir are extremely complex, the upper silty clay is 2.0-5.0m thick, the silty clay is 0-8.0m thick, and the sandy gravel layer is 2.20-5.50m thick. The silty soil is distributed at an elevation of 7.0-15.0m, located below the water level of the reservoir, and the silty clay is thicker in the area around 350m long on the north side of the homogeneous earth dam, which is 3-8m. The silty clay is soft and plastic, a small amount is even liquid plastic, contains a small amount of crushed stone or gravel, and has extremely poor stability.

[0042] ...

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Abstract

The invention belongs to the field of dam foundation reinforcement, in particular to a dam foundation reinforcement frame structure and a dam foundation reinforcement method. The dam foundation reinforcement frame structure comprises a plurality of piles, the main body of every pile is arranged in the soft foundation of the base foundation, the bottom of every pile extends to the boundary between the bedrock and the base foundation, the top of every pile is above the ground line, the portion of every pile, which is above the ground line, is a removable laitance portion, at least a reinforcement member is arranged in every pile, the lower portion of every reinforcement member exceeds the boundary between the bedrock and the base foundation, the top of every reinforcement member is above the ground line, and concrete lattice girders are fixedly connected through the removable laitance portions and the reinforcement members. The dam foundation reinforcement method is that a steel tube is inserted into a high pressure jet grouting pile through the vibroflotation, extended into the bedrock and forms the frame structure with the dam slope lattice girders. The dam foundation reinforcement method and the dam foundation reinforcement frame structure are applicable to soft dam foundation and can significantly improve the overall strength and the skid resistance of the dam foundation.

Description

Technical field [0001] The invention belongs to the field of dam -based reinforcement, which involves a dam -based reinforcement frame structure and dam -based reinforcement method. Background technique [0002] The dam -based reinforcement methods commonly used in the engineering industry are: replacement of the padding layer, vibrating water piles, cement soil stirring method, strong ramming method, high -voltage rotor and spray method, etc. [0003] The replacement of the cushion layer is suitable for shallow layer weak foundation. For the weak layers with deep distribution and wide range, it is often because the excavation and recovery volume is too large, and it is not economical. [0004] The squeezing squeezed sand piles and cement soil mixing methods have certain advantages in improving the overall strength of the dam base and the control of dam -based settlement, but the anti -slip effect is not significant. [0005] The ramming method is suitable for gravel soil, sand s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/40
Inventor 宁永升刘昊冯树荣李国权陈洪来常姗姗
Owner POWERCHINA ZHONGNAN ENG
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