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Method for testing fluidity gradual loss of grouting slurry stratified flow cone

A test method and fluidity technology, applied in the measurement of DC flow characteristics, etc., can solve the problems of inapplicability and the deviation of test results from the actual situation, and achieve the effect of high accuracy

Active Publication Date: 2021-06-22
CHINA RAILWAY SIXTH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of synchronous grouting behind the shield wall of the subway with large fluidity and its own buoyancy, the test cone of the mortar consistency meter sinks and is suspended in the mortar, causing the test results to deviate from the actual situation. The method is only suitable for the water retention performance of mortar under the condition of small consistency, but not for the characteristics of large fluidity grout after synchronous grouting after the shield wall of the subway

Method used

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  • Method for testing fluidity gradual loss of grouting slurry stratified flow cone
  • Method for testing fluidity gradual loss of grouting slurry stratified flow cone
  • Method for testing fluidity gradual loss of grouting slurry stratified flow cone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Mix the grout according to the synchronous grouting slurry mix ratio shown in Table 1, and use the flow cone fluidity tester to detect the flow cone fluidity S of the grouting slurry in the initial state 1 , and then put the slurry into the mortar stratification meter, vibrate on the concrete vibrating table for 5s, and then let it stand for 30min. The vibration frequency of the concrete vibrating table is 2860 times / min, and the amplitude is 0.3-0.6mm. The vibrator power of the concrete vibrating table is 0.55kw. 100kg. Pour the 100mm slurry from the lower part of the mortar stratification meter into the container, stir it quickly with a small spoon, then quickly pour it into the flow cone fluidity tester, and measure the fluidity S of the stratified flow cone of the grouting slurry for 30 minutes 2 .

[0063] Calculate the time-lapse loss T of stratified flow cone mobility. Referring to Table 2, the time-lapse loss of stratified flow cone fluidity is 0.56s.

[006...

Embodiment 2

[0069] Mix the slurry according to the synchronous grouting slurry mix ratio shown in Table 3, and use the flow cone fluidity tester to detect the flow cone fluidity S of the grouting slurry in the initial state 1 , and then put the slurry into the mortar stratification meter, vibrate on the concrete vibrating table for 10 seconds, and then let it stand for 30 minutes. The vibration frequency of the concrete vibrating table is 2860 times / min, and the amplitude is 0.3-0.6mm. The vibrator power of the concrete vibrating table is 0.55kw. 100kg. Pour the 100mm slurry from the lower part of the mortar stratification meter into the container, stir it quickly with a small spoon, then quickly pour it into the flow cone fluidity tester, and measure the fluidity S of the stratified flow cone of the grouting slurry for 30 minutes 2 .

[0070] Calculate the time-lapse loss T of stratified flow cone mobility. Referring to Table 4, the loss of stratified flow cone fluidity over time is 0...

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Abstract

The invention discloses a method for testing the fluidity gradual loss of a grouting slurry layered flow cone, and relates to the field of shield construction methods. The method is suitable for detecting the layered flow cone fluidity time-dependent loss of the high-fluidity slurry for synchronous grouting behind the subway shield wall. The method can better reflect the time loss of the water retention performance and the flowing performance of the characteristics of the high-flowability slurry for synchronous grouting behind the subway shield wall. The method is high in detection result accuracy, and can be widely applied to detection of the fluidity gradual loss of the stratified liquid of the synchronous grouting slurry behind the shield segment in the construction engineering fields of railways, highways, subways and the like.

Description

technical field [0001] The invention relates to the field of shield tunneling methods, in particular to a test method for the time-lapse test method of the fluidity loss of the laminar flow cone of grouting slurry. Background technique [0002] At present, the shield method is the main construction method used in the construction of underwater tunnels and underground tunnels. The synchronous grouting technology behind the shield segment is a key technology in the construction of shield tunnels. There are two types of back grouting. Advance synchronous grouting; the other is grouting by the reserved grouting holes on the segments. When using the shield method to excavate the tunnel, since the outer diameter of the shield is larger than that of the shield segment, after the segment is installed at the end of the shield, there is a building gap between the segment and the ground. Grouting fills the building gap, and the grouting method behind the segments can be synchronous o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/06
CPCG01N11/06
Inventor 张怀伟霍志刚侯志强于洋王小鹏梁生颖王伟谢行飞张俊豪于翔李学颖曹雪敏郭瑞鹏孟晨晨胡晋嵘
Owner CHINA RAILWAY SIXTH GROUP
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