Method for preventing settlement and cracking of large-area terrace in soft soil area by adopting unbounded prestressing concrete beams

A technology with weak soil layer and no bonding, which is applied in the field of cracking and prevention of large-area floor subsidence. It can solve the problems of abnormal use of buildings or workshops, uneven settlement and cracking, and high cost, so as to improve the jacking capacity and The effect of scope of influence, short construction period and low cost

Active Publication Date: 2014-09-17
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 for preventing settlement and cracking of large-area terrace in soft soil area by adopting unbounded prestressing concrete beams
  • Method for preventing settlement and cracking of large-area terrace in soft soil area by adopting unbounded prestressing concrete beams
  • Method for preventing settlement and cracking of large-area terrace in soft soil area by adopting unbounded prestressing concrete beams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the method for preventing large-area floor settlement and cracking by using unbonded prestressed concrete beams in areas with weak soil layers is characterized in that it includes the following steps:

[0036] 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;

[0037] 2) Arranging a strip geotextile or a strip geogrid 14 on the strip plain soil belt 5;

[0038]3) On the belt-shaped geotextile or belt-shaped geogrid 14, a belt-shaped crushed stone cushion or a belt-shaped sandstone cushion or a belt-shap...

Embodiment 2

[0050] Such as Figure 5 As shown, it is basically the same as in Example 1, the difference is that all the belt-shaped plain soil belts form a grid structure, belt-shaped geotextiles or belt-shaped geogrids 14, belt-shaped gravel cushions or belt-shaped sand The arrangement of the stone cushion or the strip-shaped cement stabilized sand layer 8, the strip-shaped plain concrete cushion 6, and the unbonded prestressed concrete beam 11 is the same as that of the strip-shaped plain soil belt. Each of the unbonded prestressed concrete beams and the composite belt-shaped cushions below them are arranged vertically and horizontally with the intersecting unbonded prestressed concrete beams and the composite belt-shaped cushions below them to form a grid structure.

[0051] 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 crac...

Embodiment 3

[0053] Such as Image 6 , Figure 8 As shown, it is basically the same as Embodiment 1, the difference is that the longitudinal section shape of the unbonded 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 unbonded prestressed concrete beam in the middle of the area is large, and the section height of the unbonded prestressed concrete beam near the ground beam area is small). It is beneficial to the formation of unbonded prestressed steel strand waveforms and improves the jacking capacity and influence range of unbonded 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 stepped, which is beneficial to the arrangement of unbonded prestressed steel strands and reduces costs.

[0054] It is...

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Abstract

The invention relates to a method for preventing large-area floor subsidence and cracking by using unbonded prestressed concrete beams in areas with weak soil layers. The method for preventing large-area floor subsidence and cracking by using unbonded prestressed concrete beams in areas with weak soil layers is characterized in that it includes the following steps: 1) setting a compacted belt on the weak soil layer below the designed reinforced concrete floor 2) Set strip-shaped geotextile or strip-shaped geogrid; 3) Set strip-shaped crushed stone cushion or strip-shaped sandstone cushion or strip-shaped cement stabilized sand layer; 4) Set strip-shaped plain concrete Cushion; 5) Arrangement of unbonded prestressed steel strands according to the designed wavy direction; 6) Pouring concrete for unbonded prestressed concrete beams, and then pouring concrete for reinforced concrete floors; 7) When When the poured reinforced concrete floor and unbonded prestressed concrete beams reach 75% of their design strength, the unbonded prestressed steel strands are stretched. The method is simple and easy to implement, and can prevent the settlement and cracking of large-area floors.

Description

technical field [0001] The invention relates to a method for preventing large-area floor subsidence and cracking by using unbonded 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 flo...

Claims

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Application Information

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