Membrane structure and detection method for detecting reinforcement effect in vacuum preloading process

A detection method and vacuum membrane technology, which are applied in the fields of infrastructure engineering, soil protection, and on-site foundation soil survey, etc., can solve the problem of affecting the sealing performance of the vacuum system, destroying the vacuum preloading or vacuum combined stacking preloading and loading continuity. and other problems, to achieve the effect of ensuring the continuity of sealing and loading, ensuring continuity and stability, and good sealing.

Active Publication Date: 2017-11-10
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the soft soil foundation is strengthened by vacuum preloading and vacuum combined surcharge preloading, it is necessary to test the reinforcement effect. The existing detection methods generally use in-situ testing or drilling samples to destroy the vacuum membrane after the vacuum pump is stopped. The reinforcement effect detection of membrane rupture at the end of construction can generally meet the requirements of project completion acceptance, but when studying the reinforcement effect during vacuum preloading or vacuum combined surcharge preloading, this method of membrane rupture detection seriously affects the vacuum system. The tightness of the vacuum preloading or vacuum combined surcharge preloading also destroys the continuity of the preloading

Method used

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  • Membrane structure and detection method for detecting reinforcement effect in vacuum preloading process
  • Membrane structure and detection method for detecting reinforcement effect in vacuum preloading process
  • Membrane structure and detection method for detecting reinforcement effect in vacuum preloading process

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Embodiment 1

[0033] Embodiment one, such as figure 2 As shown, using the above membrane structure to detect the reinforcement effect during the vacuum preloading process, the specific steps are as follows:

[0034] ①. According to the length not less than 1500mm (the length of the outlet pipe embedded in the sludge is 500mm and the height above the drainage cushion is 500mm, the total length of the outlet pipe = 1000+ the thickness of the drainage cushion), the diameter of the pipe is 90mm ~ 150mm, and the membrane pipe is cut out 1;

[0035] ②. Pass the discharge pipe 1 through the drainage sand cushion 5, and bury it in the silt or muddy cohesive soil foundation to be reinforced. The depth of embedding is not less than 500mm. The discharge pipe 1 is about 500mm exposed from the cushion, and the nozzle is exposed Wrap it with geotextile to avoid scratching the vacuum membrane when laying the membrane;

[0036] ③. Clean the sand in the film outlet pipe in step ② and pour it into silt or...

Embodiment 2

[0042] Embodiment two, such as image 3 As shown, using the film-out structure of the present invention to detect the reinforcement effect in the vacuum combined surcharge preloading process, the specific steps are as follows:

[0043] ①. The length of the first section of the film outlet pipe is not less than 1500mm (the length of the film outlet pipe buried in the mud is 500mm and the height above the drainage cushion is 500mm, the total length of the first section of the film outlet pipe = 1000 + the thickness of the drainage cushion, and the subsequent length is based on the stack The thickness of the loaded packing increases the corresponding length), the pipe diameter is 90mm~150mm, and the membrane pipe is cut out 1;

[0044] ②. Pass the membrane discharge pipe 1 through the drainage sand cushion 5, and embed it in the silt or silty cohesive soil foundation to be reinforced. The depth of embedding shall not be less than 500mm. The mouth is wrapped with geotextile to av...

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Abstract

The invention provides a film-out structure and a detection method for detecting the reinforcement effect in the vacuum preloading process. The detection method is as follows: first prepare a membrane outlet pipe with a diameter of not less than 90mm and a length of not less than 1300mm, lay it on the drainage sand cushion, embed the membrane outlet pipe in the soft soil layer to be reinforced, and then lay the outlet pipe in sequence. For the lower geotextile of the membrane hole and the vacuum membrane, an upward-turned curl is reserved on the edge of the membrane hole, and the curl is sealed and fixed on the membrane outlet tube with PVC glue and elastic ties, and then vacuum preloaded. After vacuum preloading for a period of time, insert the detection probe rod of the in-situ detection device into the soft soil layer to be reinforced through the upper nozzle of the film outlet pipe for in-situ detection. seal. The invention not only satisfies the requirements of stable vacuum degree under the film and continuous loading preloading, but also meets the requirements of detecting soft soil reinforcement effect during vacuum preloading or vacuum combined surcharge preloading process.

Description

technical field [0001] The invention relates to the technical field of vacuum preloading or vacuum combined surcharge preloading reinforcement soft soil foundation treatment, in particular to a film-out structure and a detection method for detecting the reinforcement effect in the vacuum preloading process. Background technique [0002] At present, various soft soil strata are widely distributed in coastal areas and inland plains or mountainous areas of our country. Soft ground is characterized by high water content, high compressibility, low strength, and poor water permeability. Due to its low strength, the bearing capacity and stability of the foundation often cannot meet the engineering needs. Sites, roads or other similar fillings on soft ground In construction projects, the preloading method is often used for foundation treatment, among which vacuum preloading and vacuum combined surcharge preloading are common preloading methods for strengthening soft soil foundations...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10E02D1/00
Inventor 彭典华黄涛吕桂生王宗魁沈新中
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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