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Local foundation settlement reinforcement method for steel storage tank ring wall foundation

A technology for steel storage tanks and foundations, which is applied in the field of local subsidence and reinforcement of steel storage tank ring wall foundations, can solve problems such as weak lateral constraints and difficult control of grouting volume, and achieve reduced horizontal lateral deformation and good technical effects Effect

Active Publication Date: 2014-03-19
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the amount of grouting in the prior art is difficult to control and the lateral restraint of the grouting curtain on the reinforced soil is weak. It provides a new steel storage tank ring wall foundation local subsidence reinforcement method

Method used

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  • Local foundation settlement reinforcement method for steel storage tank ring wall foundation
  • Local foundation settlement reinforcement method for steel storage tank ring wall foundation
  • Local foundation settlement reinforcement method for steel storage tank ring wall foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Local subsidence occurred in the foundation of a steel storage tank. The subsidence soil is mainly highly compressible, plastic-flow-plastic cohesive soil and silty cohesive soil. The location of the occurrence is under the tank ring wall foundation. Firstly, the scope and depth of the subsidence area were determined, and then the grouting curtain was artificially slotted 3m outside the ring wall foundation. The grouting curtain consisted of a bamboo raft and two rows of grouting holes, and the length of the grouting curtain was partially The subsidence area is extended by 1.0m. The bamboo raft is made of multiple bamboo boards that are overlapped and connected with each other. The depth of the bamboo board is 3m, and the distance between the grouting holes is 1000mm. It is 1500mm. Grouting in the grouting hole, the grouting material is mainly cement mortar with low slump, after forming the grouting curtain, adopt the conventional compaction grouting process to carry ou...

Embodiment 2

[0025] Local subsidence occurred in the foundation of a steel storage tank. The subsidence soil is mainly highly compressible, plastic-flow-plastic cohesive soil and silty cohesive soil. The location of the occurrence is under the tank ring wall foundation. Firstly, the scope and depth of the subsidence area are determined, and then the grouting curtain is artificially slotted 2.5m away from the outer side of the ring wall foundation. The grouting curtain consists of two polypropylene geogrids and four rows of grouting holes spaced apart from each other. . The length of the grouting curtain is 1.2m outside the local subsidence area, the depth of the polypropylene geogrid is 3m, the distance between the grouting holes is 750mm, and the distance between two rows of grouting holes is 1000mm. Grouting in the grouting hole, the grouting material is mainly cement mortar with low slump, after forming the grouting curtain, adopt the conventional compaction grouting process to carry ou...

Embodiment 3

[0027]Local subsidence occurred in the foundation of a steel storage tank. The subsidence soil is mainly highly compressible, plastic-flow-plastic cohesive soil and silty cohesive soil. The location of the occurrence is under the tank ring wall foundation. Firstly, the scope and depth of the subsidence area were determined, and then a grouting curtain was artificially slotted 4m outside the ring wall foundation. The grouting curtain consisted of two bamboo rafts and four rows of grouting holes, spaced apart from each other. The length of the grouting curtain is 0.8m outside the local subsidence area, the depth of the bamboo raft is 3m, the distance between the grouting holes is 1500mm, and the distance between two rows of grouting holes is 2000mm. Grouting in the grouting hole, the grouting material is mainly cement mortar with low slump, after forming the grouting curtain, adopt the conventional compaction grouting process to carry out compaction grouting in the local subsiden...

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Abstract

The invention relates to a local foundation settlement reinforcement method for a steel storage tank ring wall foundation, and mainly solves the problems that the grouting range is not easy to control and lateral restraint of a grouting curtain for a reinforced soil body is weak in the prior art. The local foundation settlement reinforcement method for the steel storage tank ring wall foundation comprises the steps as follows: firstly, the range and the depth of a local foundation settlement area of the steel storage tank ring wall foundation are determined, then a groove is formed in the position with a distance more than 2 m away from the outer side of the steel storage tank ring wall foundation, so that the grouting curtain is arranged, compaction grouting holes are formed in an area between the grouting curtain and the ring wall foundation as well as the local foundation settlement area, and the steel storage tank foundation is reinforced; and the grouting curtain consists of at least one flexible reticular grid layer formed by weaving a hard material and the compaction grouting holes, and one row of compaction grouting holes is formed in each of the left and right of the grid layer. With the adoption of the technical scheme for forming the grouting curtain, the problem is solved very well, and the method is suitable for reinforcing local foundation settlement of the steel storage tank ring wall foundation.

Description

technical field [0001] The invention relates to a reinforcement method for local subsidence of foundation of ring wall foundation of steel storage tank. technical background [0002] The form of settlement of steel storage tank ring wall foundation is generally divided into two types: uniform settlement and uneven settlement, and the main influence on the tank body is uneven settlement. Uneven settlement can be divided into three forms: dish shape (commonly known as pot bottom shape), plane inclined settlement and non-planar inclined settlement. Dish-shaped settlement has no effect on the tank body, but it will lead to stress concentration at the joint between the edge bottom plate and the tank wall, so that the tank bottom plate will crack and cause oil leakage; plane inclined settlement will cause overall instability and buckling of the tank body, causing overall deformation of the tank wall As a result, the floating plate cannot be lifted up and down, which affects produ...

Claims

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Application Information

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IPC IPC(8): E02D35/00E02D27/38
Inventor 何国富
Owner SINOPEC SHANGHAI ENG
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