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Method utilizing slow-adhesion prestress concrete beam to prevent large-area terrace sedimentation and cracking in soft soil-layer areas

A technology for slow-bonding prestressed, soft soil layers, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of buildings or workshops that cannot be used normally, uneven settlement and cracking, and high costs, and achieve cost Low cost, simple method and short construction period

Active Publication Date: 2012-07-04
CHINA FIRST METALLURGICAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in weak soil areas or sites with thick soft soil layers, uneven settlement and cracking of large areas of buildings or workshops are common phenomena, resulting in buildings or workshops that cannot be used normally; in order to prevent buildings or workshops from being For the settlement and cracking of the large-scale floor, it is necessary to adopt the pile foundation layout in the floor area to ensure that the large-area floor does not settle and crack; this can ensure that the floor does not settle and crack, but the cost is high , long construction period

Method used

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  • Method utilizing slow-adhesion prestress concrete beam to prevent large-area terrace sedimentation and cracking in soft soil-layer areas
  • Method utilizing slow-adhesion prestress concrete beam to prevent large-area terrace sedimentation and cracking in soft soil-layer areas
  • Method utilizing slow-adhesion prestress concrete beam to prevent large-area terrace sedimentation and cracking in soft soil-layer areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] like figure 1 , figure 2 , image 3 , Figure 4 As shown, the method of using slow bonded prestressed concrete beams to prevent large-area floor settlement and cracking in weak soil areas is characterized in that it includes the following steps:

[0037]1) According to the distribution of the span, a tamped strip-shaped plain soil zone 5 is set on the soft soil layer under the designed reinforced concrete floor, and the distance between the adjacent strip-shaped plain soil zone and the strip-shaped plain soil zone is 2 ~5m, the width of the strip-shaped plain soil belt is 10-50cm, and the thickness of the strip-shaped plain soil belt is 10-50cm; the material of the strip-shaped plain soil belt 5 is clay;

[0038] The strip-shaped plain soil belt and the strip-shaped plain soil belt are arranged in parallel, the strip-shaped geotextile or the strip-shaped geogrid 16, the strip-shaped crushed stone cushion or the strip-shaped sandstone cushion or the strip-shaped cem...

Embodiment 2

[0052] like Figure 5 As shown, it is basically the same as in Example 1, the difference is that all strips of plain soil form a grid structure, geotextile or strip geogrid 16, strip gravel cushion or strip sandstone The arrangement of the cushion layer or the strip-shaped cement stabilized sand layer 8, the strip-shaped plain concrete cushion layer 6, and the slow bonded prestressed concrete beam 11 is the same as that of the strip-shaped plain soil belt. Each slow-bonding prestressed concrete beam and its composite belt-shaped cushion layer and the intersecting slow-bonding prestressed concrete beam and its composite belt-shaped cushion layer are arranged vertically and horizontally to form a grid structure.

[0053] It is proved by experiments and implementation that after adopting the method of this embodiment, the large-area floors of buildings or workshops in areas with weak soil layers do not suffer from subsidence or cracking.

Embodiment 3

[0055] like Image 6 , Figure 8 As shown, it is basically the same as Embodiment 1, the difference is that the longitudinal section shape of the slow bonded prestressed concrete beam 11 is a step-shaped unequal section with a wide top and a narrow bottom (a square shape surrounded by four pillars) The section height of the slow bonded prestressed concrete beam in the middle of the area is large, and the section height of the slow bonded prestressed concrete beam near the ground beam area is small, such as Image 6 shown). It is beneficial to the formation of slow-bonded prestressed steel strand waveforms and improves the jacking capacity and influence range of slow-bonded prestressed concrete beams on the floor, while reducing costs; the banded crushed stone cushion or banded sand The stone cushion or the strip-shaped cement-stabilized sand layer or the strip-shaped plain concrete cushion is step-shaped, which is beneficial to the arrangement of slow bonded steel strands and ...

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Abstract

The invention relates to a method utilizing a slow-adhesion prestress concrete beam to prevent sedimentation and cracking of a large-area terrace in soft soil-layer areas, which is characterized by comprising the following steps: 1) arranging a compacted belt-shaped plain soil belt on a soft soil layer below a designed reinforced concrete terrace; 2) arranging belt-shaped geotextile or belt-shaped geogrid; 3) arranging a belt-shaped broken-stone cushion layer or a belt-shaped sandstone cushion layer or a belt-shaped cement stabilizing sand layer; 4) arranging a belt-shaped plain concrete cushion layer; 5) arranging a fixing support of a slow-adhesion prestress steel strand on the belt-shaped plain concrete cushion layer according to the arranging mode of the slow-adhesion prestress steel strand in a wave-shaped trend, and fixing the slow-adhesion prestress steel strand on the fixing support; 6) pouring concrete of the slow-adhesion prestress concrete beam and then pouring concrete of the reinforced concrete terrace; and 7) tensioning the slow-adhesion prestress steel strand when the poured reinforced concrete terrace and the slow-adhesion prestress concrete beam achieve 75% of their design strength. The method is simple and practical and can prevent sedimentation and cracking of the large-area terrace.

Description

technical field [0001] The invention relates to a method for preventing large-area floor subsidence and cracking by using slow bonded prestressed concrete beams in areas with weak soil layers. Background technique [0002] At present, in weak soil areas or sites with thick soft soil layers, uneven settlement and cracking of large areas of buildings or workshops are common phenomena, resulting in buildings or workshops that cannot be used normally; in order to prevent buildings or workshops from being For the settlement and cracking of the large-scale floor, it is necessary to adopt the pile foundation layout in the floor area to ensure that the large-area floor does not settle and crack; this can ensure that the floor does not settle and crack, but the cost is high , Long construction period. The characteristics of uneven settlement and cracking of large-area floors of buildings or workshops are: the settlement of the ground beams connected to the columns is small, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/34E02D3/00E02D3/08
Inventor 王平
Owner CHINA FIRST METALLURGICAL GROUP
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