Film discharge structure and detection method used for detecting reinforcement effect in vacuum prepressing

A detection method and vacuum membrane technology, which is applied in infrastructure engineering, soil protection, on-site foundation soil survey, etc., can solve the problem of damaging the continuity of vacuum preloading or vacuum combined surcharge preloading and affecting the sealing performance of vacuum systems and other problems, to achieve the effect of ensuring the continuity of sealing and loading, ensuring continuity and stability, and easy operation

Active Publication Date: 2015-12-02
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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  • Abstract
  • 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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  • Film discharge structure and detection method used for detecting reinforcement effect in vacuum prepressing
  • Film discharge structure and detection method used for detecting reinforcement effect in vacuum prepressing
  • Film discharge structure and detection method used for detecting reinforcement effect in vacuum prepressing

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Experimental program
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Effect test

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 avo...

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Abstract

The invention provides a film discharge structure and a detection method used for detecting a reinforcement effect in vacuum prepressing. The detection method comprises that a film discharge tube with a diameter of no less than 90 mm and a length of no less than 1300 mm is prepared at first and then laid on a drainage sand cushion layer, the film discharge tube is embedded into a soft soil layer to be reinforced, a lower-layer geotextile equipped with a film discharge hole and a vacuum film are then laid successively, a rolled edge turned upwards is preserved on the edge of the film discharge hole, the rolled edge is sealed and fixed on the film discharge tube by a PVC adhesive and an elastic binding role, the vacuum prepressing is then carried out for a certain period, a detection probing rod of a detection device at an original position is inserted into the soft soil layer to be reinforced through an upper tube hole of the film discharge tube to realize original position detection, and secondary sealing is carried out to a tube hole of the film discharge tube after the detection. The film discharge structure and the detection method used for detecting the reinforcement effect in the vacuum prepressing provided by the invention satisfy requirements for vacuum degree stabilization under a film and continuous loading and prepressing, and can also satisfy requirements for detecting the soft soil reinforcement effect during the vacuum prepressing or vacuum combined preloading.

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 Applications(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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