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A construction method of preloading and preloading soft foundation reinforcement

A soft foundation reinforcement, heap load preloading technology, applied in infrastructure engineering, soil protection, construction, etc., can solve the problems of increasing construction project expenditure, difficulty in detecting and controlling the degree of foundation consolidation, and increasing difficulty in implementation. The effect of avoiding construction difficulty, simplifying construction and reducing construction difficulty

Active Publication Date: 2018-06-22
天鸿建设集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most common construction method for soft foundations is preloading and vacuuming. During the construction process, vacuum pipelines and vacuuming devices need to be laid. Generally, vacuuming is maintained for about 10 days until the degree of consolidation of the foundation reaches a certain value. Stop vacuuming and unload the pipeline. In the actual operation process, this vacuum system will inevitably increase the expenditure of the entire construction project in terms of cost. Secondly, it is difficult to detect and control the degree of consolidation inside the foundation during the vacuuming process, resulting in the most The implementation of the key vacuuming process is more difficult

Method used

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  • A construction method of preloading and preloading soft foundation reinforcement
  • A construction method of preloading and preloading soft foundation reinforcement
  • A construction method of preloading and preloading soft foundation reinforcement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Dry 20 parts of nano-calcium carbonate and 1 part of carbon nanotubes in an oven at 100°C;

[0101](2) Weigh 80 parts of PE, 20 parts of phenolic resin, 10 parts of EPDM rubber, 15 parts of styrene-butadiene rubber, 20 parts of nano-calcium carbonate, and 1 part of carbon nanotubes into a high-speed mixer, and mix at high speed for 10 minutes; Then add 5 parts of 2-hydroxy-4-n-octyloxybenzophenone, 1 part of diphenylamine, 1 part of diisooctyl phthalate and 1 part of crosslinking agent into the high-speed mixer, and mix at high speed for 20 minutes;

[0102] (3) Put the above blend into an extruder for melt extrusion, the barrel temperature of the extruder is 192°C, and the screw speed of the extruder is 180r / min;

[0103] (4) The above-mentioned melt is formed into a plate through a three-roll calender, and then punched with a die by a punching machine, and stretched after heating up to 82°C through an orifice plate.

Embodiment 2

[0105] (1) Dry 25 parts of nano-silica, 1.2 parts of carbon nanotubes, and 5 parts of carbon fiber in an oven at 100°C;

[0106] (2) Weigh 77 parts of PP, 23 parts of phenolic resin, 12 parts of EPDM rubber, 12 parts of styrene-butadiene rubber, 25 parts of nano-silica, 1.2 parts of carbon nanotubes and 5 parts of carbon fiber into the high-speed mixer , mixed at high speed for 10 minutes; then added 6 parts of o-hydroxybenzotriazole, 2 parts of p-phenylenediamine, 1.5 parts of diisooctyl phthalate and 1 part of crosslinking agent to the high-speed mixer, and mixed at high speed for 20 minutes;

[0107] (3) Put the above blend into an extruder for melt extrusion, the barrel temperature of the extruder is 192°C, and the screw speed of the extruder is 180r / min;

[0108] (4) The above-mentioned melt is formed into a plate through a three-roll calender, and then punched with a die by a punching machine, and stretched after heating up to 82°C through an orifice plate.

Embodiment 3

[0110] (1) Dry 30 parts of talcum powder, 1.5 parts of carbon nanotubes, and 10 parts of glass fiber in an oven at 100 ° C;

[0111] (2) Weigh 75 parts of PVC, 25 parts of phenolic resin, 15 parts of EPDM rubber, 10 parts of styrene-butadiene rubber, 30 parts of talcum powder, 1.5 parts of carbon nanotubes and 10 parts of glass fiber into the high-speed mixer, Mix at high speed for 10 minutes; then add 7 parts of 4-tert-butylphenyl salicylate, 3 parts of diphenylamine, 2 parts of diisooctyl phthalate and 1 part of crosslinking agent to the high-speed mixer, and mix at high speed for 20 minutes ;

[0112] (3) Put the above blend into an extruder for melt extrusion, the barrel temperature of the extruder is 192°C, and the screw speed of the extruder is 180r / min;

[0113] (4) The above-mentioned melt is formed into a plate through a three-roll calender, and then punched with a die by a punching machine, and stretched after heating up to 82°C through an orifice plate.

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PUM

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Abstract

The invention discloses a construction method of heaping pre-compression soft foundation reinforcement. The construction method comprises the following steps: clearing the ground surface of a construction area and leveling a site; paving geotextile on the cleared ground surface, paving a 29-31cm first sand cushion layer on the geotextile, and making 3-4% cross slopes; hammering plastic draining plates below a foundation by a plate inserting machine, and then paving a first geogrid and a 19-21cm second sand cushion layer; then paving a second geogrid on the second sand cushion layer, and arranging draining gutters at the two sides, wherein the draining gutters are located at the toe line parts of embankment slopes; embedding monitoring instruments, such as settlement plates and displacement side piles; carrying out compaction treatment on the ground surface; filling a roadbed to a heaping design elevation in a layered manner, and carrying out heaping pre-compression for 9-12 months; and unloading an embankment to an elevation which is 0.2m lower than the roadbed design elevation, utilizing the plurality of plastic draining plates which are hammered below the foundation to draw up underground water, and effectively ensuring the uniform settlement of the cushion layers by utilizing the geogrids paved on each sand cushion layer. The construction method is suitable for large-area application and popularization.

Description

technical field [0001] The invention relates to a construction method for soft soil foundation, in particular to a construction method for surcharged preloading soft foundation reinforcement. Background technique [0002] The groundwater level is high in southern my country and coastal rainy areas, and the soil is mostly soft soil with high water content. To build infrastructure projects such as railways, highways or airports on such soft foundations, the soft soil must be drained to reduce The water level can reduce the water content of the soil layer, so that the soil can be fixed to achieve the required strength and bearing capacity of the roadbed. [0003] At present, the most common construction method for soft foundations is preloading and vacuuming. During the construction process, vacuum pipelines and vacuuming devices need to be laid. Generally, vacuuming is maintained for about 10 days until the degree of consolidation of the foundation reaches a certain value. Sto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10
CPCE02D3/10
Inventor 谭功毅马伟才袁东恩王国表马维
Owner 天鸿建设集团有限公司