The main function of the horizontal drainage system is drainage, gas and vacuum transmission, and is usually arranged in a fishbone shape. In order to reduce energy consumption, the branch and main filter tubes should be connected by flared joints, and the joints should be secured with rubber bellows. The schematic diagram of the filter tube layout, the branch and the main filter tube are buried in the sand cushion after being connected, and the filter tube is filled with sand, and it is forbidden to be overhead or missed.
Sealing system
a. Sealing film. The sealing membrane is made of salt, and the sand mat should be smoothed before laying. When laying the film, put the edge of the film into the sealing groove, check for damage after laying, and immediately remedy if there is any, then lay the second layer of the film. The joint between the two layers of the film should be staggered, and the sealed groove edge should be left. There is a certain amount of film.
b. Sealing ditch. The sealing groove is an important part of ensuring that the vacuum degree meets the design requirements. If the airtightness cannot be guaranteed, the vacuum degree can hardly meet the design requirements.
In the construction of sealed trenches, the following points should be noted:
1 The contact between the membrane in the sealing groove and the soft soil should have a sufficient length;
2 The film in the sealing groove should have a certain pressure, so that the film has a good air tightness around the edge, and the blanking material is suitable for clay.
3 After the sealing groove is excavated, the slope should be flattened; 4 The sealing groove should be filled with water after backfill to facilitate sealing.
c. Pressurized system.
1 vacuum system. The evacuation system is caused by the pressure difference formed by the atmospheric pressure below the membrane below the atmospheric pressure outside the membrane. Vacuum equipment is mainly: vacuum pump, jet box, motors, generators and so on. Each vacuum pump control area is appropriate about 600m2. The maintenance measures for vacuum degree are as follows: For the hole formed after the insertion of the plastic drainage plate, the hole should be filled with coarse sand in time to prevent the sealing film from being pulled down by the negative pressure after the vacuum is applied. The damaged sealing film should be promptly repaired; When cracks appear in the ditch, they should be stepped on in time; reinforce on-duty patrols and find problems in time;
2 The film is loaded. Since the sealing film is a material that is easily damaged, it should be treated specially to protect the integrity of the sealing film. In order to ensure that the roller compaction machinery can operate directly, a layer of non-woven geotextile is laid on the sealing membrane, and then the earth material that has been crushed in the borrow pit is unloaded and unloaded with a dump truck, and can be rolled after pushing with a bulldozer, but In the initial three-tier roadbed filling process, rolling machinery is strictly prohibited to open vibration equipment.
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