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Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer

A soft soil layer, prestressed technology, applied in the field of combined prestressed concrete beams to prevent large-scale floor settlement and cracking, can solve the problems of buildings or workshops not being used normally, uneven settlement and cracking, and long construction period, etc. Achieve the effect of low cost, short construction period and prevention of settlement

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 for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer
  • Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer
  • Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] like figure 1 , figure 2 , image 3 , Figure 4 As shown, the method of using combined prestressed concrete beams to prevent large-scale floor settlement and cracking in areas with weak soil layers includes the following steps:

[0046] 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;

[0047] 2) Arranging a strip geotextile or a strip geogrid 16 on the strip plain soil belt 5;

[0048] 3) On the belt-shaped geotextile or belt-shaped geogrid 16, a belt-shaped crushed stone cushion or a belt-shaped sandstone cushion or a belt-shaped cement stabilized sand layer ...

Embodiment 2

[0063] like Figure 5 As shown, it is basically the same as that of Example 1, the difference is that all the belt-shaped plain soil belts form a grid-like structure, belt-shaped geotextiles or belt-shaped geogrids 16, 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 prestressed concrete beam 11 is the same as that of the strip-shaped plain soil belt. Each of the prestressed concrete beams and the composite belt-shaped cushions below them are arranged vertically and horizontally with the intersecting prestressed concrete beams and the composite belt-shaped cushions below them to form a grid structure.

[0064] Experiments and implementation have proved that after adopting the method of this embodiment, there is no phenomenon of settlement or cracking on the large-area floors of buildings or workshops in areas with weak soil layers.

Embodiment 3

[0066] like Figure 6 , Figure 8 As shown, it is basically the same as Embodiment 1, except that the longitudinal section shape of the prestressed concrete beam 11 is a step-shaped unequal section with a wide top and a narrow bottom (the middle part of the square area surrounded by four pillars) The section height of the prestressed concrete beam is large, and the section height of the prestressed concrete beam near the ground beam area is small), which is conducive to the formation of the wave form of the bonded prestressed steel strand (slowly bonded prestressed steel strand) and the improvement of the prestressed steel strand. Stressed concrete beams have the ability to support the ground and the range of influence, while reducing costs; the strip-shaped plain concrete cushion 6, the strip-shaped crushed stone cushion or the strip-shaped sandstone cushion or the strip-shaped cement stabilized sand layer 8 It is stepped, which is conducive to the arrangement of bonded steel...

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Abstract

The invention relates to a method for preventing the settling and the cracking of a terrace with large area by utilizing combined prestressing concrete beams at a region with a soft soil layer. The invention is characterized in that the method for preventing the settling and the cracking of the terrace with the large area by utilizing the combined prestressing concrete beams at the region with the soft soil layer comprises the following steps that: (1) a tamped belt-shaped plain soil belt is arranged; (2) a belt-shaped geotextile or a belt-shaped geogrid is arranged; (3) a belt-shaped broken-stone cushion layer or a belt-shaped sand-stone cushion layer or a belt-shaped cement-stabilizing sand layer is arranged; (4) a belt-shaped plain concrete cushion layer is arranged; (5) a prestressing steel stranded wire combining body is the combination of two random kinds or three random kinds of a steel stranded wire with adhesive prestressing force, a steel stranded wire with slow adhesive prestressing force and a steel stranded wire with no adhesive prestressing force, and the prestressing steel stranded wire combining body is arranged by adopting one random mode of the two following modes: (1) the prestressing steel stranded wire combining body is arranged in the same prestressing concrete beam; and (2) the combination of the two random kinds or the three random kinds of the steel stranded wire with the adhesive prestressing force, the steel stranded wire with the slow adhesive prestressing force and the steel stranded wire with no adhesive prestressing force is respectively arranged in different prestressing concrete beams; (6) the concrete of the prestressing concrete beams is poured, and then the concrete of a reinforced concrete terrace is poured; and (7) the operation of stretching is carried out. The method is simple and easy and can be used for preventing the settling and the cracking of a terrace with large area.

Description

technical field [0001] The invention relates to a method for preventing large-area floor subsidence and cracking by using combined 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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IPC IPC(8): E02D27/34E02D3/00E02D3/08
Inventor 王平
Owner CHINA FIRST METALLURGICAL GROUP
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