Soft soil foundation integrated well point plastic discharging vacuum system

Abstract

The invention relates to a soft soil foundation integrated well point plastic discharging vacuum system. The soft soil foundation integrated well point plastic discharging vacuum system is characterized by comprising an integrated well point plastic discharging pipe grid formed by carrying out inserting construction on an integrated well point plastic discharging pipe; the integrated well point plastic discharging pipe comprises a water discharging plate, a connection box, a well point pipe and a connection pipe; the water discharging plate is vertically distributed in a deep-layer soil body; the well point pipe is vertically distributed in a shallow-layer soil body; the upper end of the water discharging plate is connected with the lower end of the well point pipe through the connection box; the upper end of the well point pipe is exposed out of the shallow-layer soil body; the upper end of the well point pipe is connected with one end of the connection pipe; and the integrated well point plastic discharging pipe grid is connected with a general pipe and a vacuum pump to form the integrated well point plastic discharging vacuum system. The soft soil foundation integrated well point plastic discharging vacuum system has the advantages of simplicity in operation, low cost and good construction effect.

Description

Technical field [0001] The invention relates to a soft foundation treatment method, in particular to an integrated well point plastic vacuum exhaust system. Background technique [0002] According to the "Code for Design of Building Foundation Foundation" (GB5007-2011) 7.1.1, weak foundation refers to a foundation mainly composed of silt, mucky soil, alluvial fill, miscellaneous fill or other highly compressible soil layers. Before building construction on a weak foundation, the weak foundation needs to be consolidated. The conventional consolidation treatment methods are as follows: [0003] 1. Conventional vacuum preloading reinforcement, conventional vacuum preloading reinforcement "onshore and rivers, seas, lakes and marshes under water" soft soil foundations require the laying of sealing film and sand cushion, but there are the following shortcomings: [0004] 1. The construction of large-area sealing film is difficult, and the vacuum preloading on land requires a large amount ...

AI Technical Summary

Problems solved by technology

[0004] 1. The construction of large-area sealing membranes is difficult, and vacuum preloading on land requires a lot of manual laying of membranes with a low degree of mechanization, especially the construction of underwater vacuum preloading sealing membranes is more difficult;

[0005] 2. The PVC sealing film has low strength and is easy to be damaged and leak air. The cost of the second layer of sealing film and the first layer of geotextile is high, and it is difficult to find the air leakage point;

[0006] 3. A large number of PVC sealing films are not environmentally friendly;

[0007] 4. The surface under the film can reach a maximum negative pressure of 80kPa, and the negative pressure transmission loss to the deep part of the soil layer is fast. Generally, the loss of negative pressure per meter to the deep part is about 10kPa. The effective reinforcement depth is shallow;

[0008] 5. The loading surface is on the original ground surface or the backfilled land surface. Even if the surface sealing film does not leak, the slow air leakage of the shallow soil around the reinforcement area cannot be ignored, especially in the case of long-term loading for about 90 days, when the groundwater level drops to The degree of air leakage in shallow soil around a certain degree of reinforcement area is even more worrying

[0009] 2. The improved vacuum preloading reinforcement has the following disadvantages:

[0010] 1. The sand-removing cushion layer is changed to the mode of direct connection of plastic slabs with hand-shaped joints, and the mode of indirect negative pressure transmission is changed to direct negative pressure transmission mode, but it still needs a sealing film, and the maximum negative pressure loading surface is still on the surface;

[0011] 2. The sealing layer is formed by blowing and filling mud, or the vacuum branch pipe is directly connected to the plastic discharge into the soil for about 1.5 meters, or the vacuum filter tube is about 3 meters underground, and the side blister row replaces the sealing film. The dredging fill mud loses water, consolidates and cracks, the groundwater level drops rapidly, and the sealing effect is greatly reduced;

[0012] 3. The ultra-soft soil for land reclamation cannot be mechanically constructed. First, artificially insert the shallow layer of plastic drainage vacuum preloading, and then do deep vacuum preloading after the foundation strength is suitable for mechanical construction. The principle and process of conventional vacuum preloading are almost the same, only the simple difference between manual and mechanical, the process is more complicated, the cost is high, and the efficiency is low;

[0018] For traditional main pipes and branch pipes, submersible pump gravity dewatering is used for tube wells, and a combination of submersible pump gravity dewatering and vacuum dewatering is used for deep well dewatering. The spacing between well points is larger, generally 15*15m. The coarse and sparse treatment method focuses on precipitation. If the spacing is too large and the time is short, it cannot simultaneously have the effect of vacuum preloading and negative pressure consolidation;

[0019] Coarse and sparse distribution of genetic precipitation and short-term (about 30 days) treatment methods in the precipitation dynamic compaction treatment are only suitable for shallow treatment;

Images