CN102535503B - Method utilizing slow-adhesion prestress concrete beam to prevent large-area terrace sedimentation and cracking in soft soil-layer areas - Google Patents
Method utilizing slow-adhesion prestress concrete beam to prevent large-area terrace sedimentation and cracking in soft soil-layer areas Download PDFInfo
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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
The present invention relates to the method that a kind of soft layer area utilizes the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking.
Background technology
At present, in Soft Soil Districts or the thicker place of soft layer, the large area terrace of building or factory building occurs that differential settlement and cracking are universal phenomena, causes building or factory building normally not to use; In order to prevent sedimentation and the cracking of building or factory building large area terrace, need adopt in terrace region the pile foundation arrangement form of all round victory formula, to guarantee the not sedimentation of large area terrace and not ftracture; Do like this and no doubt can guarantee not sedimentation of terrace and not ftracture, but cost is high, long in time limit.Building or factory building large area terrace occur that the feature of differential settlement and cracking is: the sedimentation at the grade beam place being connected with post is little, and the terrace sedimentation at the middle part of the square region that four pillars surround is large, i.e. so-called " pan bottom shape " differential settlement.
Retarded adhesive prestressed concrete structure is a kind of form of structure of commonly using, but all for superstructure as the floor structure of building and roof structure and bridge construction etc.; Retarded adhesive prestressed concrete structure is that (reinforcing bar+concrete) adds slow-adhesion prestress steel strand in reinforced concrete structure, can improve the supporting capacity of former reinforced concrete structure and the ability of resistance to deformation, but be all in reinforced concrete beam, to add slow-adhesion prestress steel strand to form retarded adhesive prestressed concrete structure (reinforcing bar+concrete+slow-adhesion prestress steel strand); Tradition slow-adhesion prestress steel strand is arranged in the rectangular cross section that beam in reinforced concrete beam and steel bar concrete is identical section or the steel bar concrete that bearing place section is large, span centre section is little becomes section beam.
Summary of the invention
The object of the present invention is to provide a kind of soft layer area to utilize the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, the method simply, easily go, can be prevented sedimentation, the cracking of large area terrace.
To achieve these goals, the technical solution used in the present invention is: soft layer area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that it comprises the steps:
1) according to the distribution situation of span, the band shape element soil zone 5 of compacting is set on the soft layer below the steel concrete terrace of design, spacing between the plain soil zone of adjacent band shape and banded plain soil zone is 2～5m, the width of banded plain soil zone is 10～50cm, and the thickness of banded plain soil zone is 10～50cm;
2) banded geotextiles or banded geo-grid (16) are set on the plain soil zone of band shape (5);
3) banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are set in banded geotextiles or banded geo-grid (16), the width of banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand is 10～50cm, and thickness is 10～100cm;
4) on banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6 is set, the width of banded plain concrete bed course is 10～50cm, and thickness is 10～50cm;
5) press the arrangement form of the slow-adhesion prestress steel strand of undulate trend, the fixed support 10 of slow-adhesion prestress steel strand is set on the plain concrete bed course 6 of band shape, the support bracket fastened bottom of this slow-adhesion prestress steel strand embeds in banded plain concrete bed course 6, according to the corrugated trend of slow-adhesion prestress steel strand, determine location and the height of the fixed support 10 of slow-adhesion prestress steel strand, then on the fixed support 10 of slow-adhesion prestress steel strand, arrange bellows 15, described slow-adhesion prestress steel strand 9 is wrapped up by gel 12, gel 12 outsides are bellowss 15, the two ends of slow-adhesion prestress steel strand are connected with the ground tackle 13 being arranged on grade beam 3 respectively,
6) pour into a mould the concrete (concrete) of retarded adhesive prestressed concrete beam 11, slow-adhesion prestress steel strand 9 is positioned at the concrete of retarded adhesive prestressed concrete beam 11; Then the concrete of casting reinforced concrete terrace 4; In retarded adhesive prestressed concrete beam 11, can arrange that reinforcing bar also can not arrange reinforcing bar and only establish slow-adhesion prestress steel strand;
7) when the gentle adhesion prestressed concrete beam of steel concrete terrace of cast reach its design strength 75% time, slow-adhesion prestress steel strand 9 is carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle by tight slow-adhesion prestress steel strand anchor;
8) gel 12 in bellows 15 solidifies bellows and slow-adhesion prestress steel strand is linked to be to entirety.
Described band shape element soil zone and banded plain soil zone are and are arranged in parallel, and banded geotextiles or banded geo-grid 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6, the layout of retarded adhesive prestressed concrete beam 11 are identical with the layout of banded plain soil zone.Be positioned at band shape on same vertical plane element soil zone 5, banded geotextiles or banded geo-grid 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6 and form compounded with strip bed course (be positioned on the plain soil zone 5 of same band shape, with and banded plain soil zone 5).The retarded adhesive prestressed concrete beam on every retarded adhesive prestressed concrete beam and compounded with strip bed course and side and compounded with strip bed course thereof are and are arranged in parallel.
All band shape element soil zones form fenestral fabric, and banded geotextiles or banded geo-grid 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6, the layout of retarded adhesive prestressed concrete beam 11 are identical with the layout of banded plain soil zone.Described every retarded adhesive prestressed concrete beam and compounded with strip bed course thereof are vertical lateral arrangement with crossing retarded adhesive prestressed concrete beam and compounded with strip bed course thereof and form fenestral fabric.
The described grade beam being connected with pillar is not established prestress wire.
Longitudinal section of described retarded adhesive prestressed concrete beam 11 is shaped as rectangle, or longitudinal section of retarded adhesive prestressed concrete beam 11 is shaped as the not equal section of up big and down small step trapezoidal or wide at the top and narrow at the bottom, and (profile height of the retarded adhesive prestressed concrete beam at the square region middle part that four pillars surround is large, the profile height of the retarded adhesive prestressed concrete beam in close grade beam region is little, as shown in Figure 6, Figure 7).
Longitudinal section of described retarded adhesive prestressed concrete beam 11 is shaped as waveform unequal section, its underpart is waveform, the bottom of the top of retarded adhesive prestressed concrete beam 11 and steel concrete terrace 4 is at same absolute altitude, and near the section at grade beam 3 places is little, span centre section is large; Described banded geotextiles or banded geo-grid 16, banded plain concrete bed course 6, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are waveform.
The middle part of the square region surrounding at four adjacent pillars arranges second 14 and cushion cap, and retarded adhesive prestressed concrete beam 11 is located on above-mentioned cushion cap, and cushion cap is arranged on second 14.
The present invention adopts sedimentation, the cracking of " combination of retarded adhesive prestressed concrete beam+compounded with strip bed course structure of various shape and section " prevention large area terrace.Especially configuration reinforcement not in retarded adhesive prestressed concrete beam, and only have slow-adhesion prestress steel strand, plain concrete beam and slow-adhesion prestress steel strand (slow-adhesion prestress steel strand+concrete) combine, cancel reinforcing bar after cost low, the duration is short; And the shape of retarded adhesive prestressed concrete beam (along beam longitudinally) for step, (the prestressing force depth of beam at the square region middle part that four pillars surround is large, prestressing force depth of beam near grade beam region is little) or waveform (its underpart is waveform, the bottom of top and steel bar concrete terrace is at same absolute altitude, near the section at bearing place is little, span centre section is large, its objective is and be conducive to the formation of slow-adhesion prestress steel strand waveform and improve jacking ability and the influence basin of prestressed girder to terrace, reduce costs simultaneously); The section of retarded adhesive prestressed concrete beam (along beam laterally) be rectangle or up big and down small not equal section of step trapezoidal or wide at the top and narrow at the bottom.
According to soil layer and load situation, determine the size (banded plain soil zone+banded geotextiles or banded geo-grid+banded hardcore bed or sand-gravel cushion or cement stabilizing layer of sand+banded plain concrete bed course) of compounded with strip bed course structure, the bearing capacity of jacking force upwards and banded bed course is provided simultaneously and reduces costs.
The invention has the beneficial effects as follows: the method simply, easily go, strong operability, cost is low, the duration is short, can prevent sedimentation, the cracking of large area terrace.Adopt " combination of retarded adhesive prestressed concrete beam+compounded with strip bed course structure of various shape (longitudinally) and section (laterally) ", jacking force upwards and the bearing capacity of banded bed course are provided simultaneously, can prevent sedimentation, the cracking of soft layer area large area terrace.
Accompanying drawing explanation
Fig. 1 is the top view of embodiment 1 building or factory building terrace.
Fig. 2 is the sectional view along A-A line in Fig. 1.
Fig. 3 is the schematic diagram of slow-adhesion prestress steel strand in embodiment 1.
Fig. 4 is the fixed support schematic diagram of slow-adhesion prestress steel strand in embodiment 1.
Fig. 5 is the arrangement diagram that in embodiment 2, retarded adhesive prestressed concrete beam and compounded with strip bed course structure forms fenestral fabric.
Fig. 6 is longitudinal schematic diagram of the retarded adhesive prestressed concrete beam of step and step compounded with strip bed course structure.
Fig. 7 is longitudinal schematic diagram of the retarded adhesive prestressed concrete beam of wave and wave compounded with strip bed course structure.
Fig. 8 is the horizontal sectional schematic diagram sectional view of B-B line (in the Fig. 6 along) of the retarded adhesive prestressed concrete beam of step and step compounded with strip bed course structure.
Fig. 9 is the top view of embodiment 5 buildings or factory building terrace.
Figure 10 is the sectional view along C-C line in Fig. 9.
In figure: 1-patten, 2-pillar, 3-grade beam, 4-steel concrete terrace, the banded plain soil zone of 5-, the banded plain concrete bed course of 6-, 7-stake, the banded hardcore bed of 8-or banded sand-gravel cushion or banded cement stabilizing layer of sand, 9-slow-adhesion prestress steel strand, the fixed support of 10-slow-adhesion prestress steel strand, the retarded adhesive prestressed concrete beam of 11-, 12-gel, 13-ground tackle, second of 14-, 15-bellows, the banded geotextiles of 16-or banded geo-grid;
The specific embodiment
For a better understanding of the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not limited only to the following examples.
Embodiment 1:
As shown in Figure 1, Figure 2, Figure 3, Figure 4, soft layer area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that it comprises the steps:
1) according to the distribution situation of span, the band shape element soil zone 5 of compacting is set on the soft layer below the steel concrete terrace of design, spacing between the plain soil zone of adjacent band shape and banded plain soil zone is 2～5m, the width of banded plain soil zone is 10～50cm, and the thickness of banded plain soil zone is 10～50cm; The material of banded plain soil zone 5 is clay;
Described band shape element soil zone and banded plain soil zone are and are arranged in parallel, and banded geotextiles or banded geo-grid 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6, the layout of retarded adhesive prestressed concrete beam 11 are identical with the layout of banded plain soil zone; Be positioned at band shape on same vertical plane element soil zone 5, banded geotextiles or banded geo-grid 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6 and form compounded with strip bed course (be positioned on the plain soil zone 5 of same band shape, with and banded plain soil zone 5); The retarded adhesive prestressed concrete beam on every retarded adhesive prestressed concrete beam and compounded with strip bed course and side and compounded with strip bed course thereof are and are arranged in parallel;
2) on the plain soil zone 5 of band shape, banded geotextiles or banded geo-grid 16 are set;
3) banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are set in banded geotextiles or banded geo-grid 16, the width of banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand is 10～50cm, and thickness is 10～100cm;
Material when banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are banded hardcore bed is rubble, material while being banded sand-gravel cushion is sandstone, material while being banded cement stabilizing layer of sand is the mixture of cement, sand (or aggregate chips) and water, and in mixture, cement, sand (or aggregate chips) and water quality are than being 1:(4-6): 1.
4) on banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6 is set, the width of banded plain concrete bed course is 10～50cm, and thickness is 10～50cm;
The material of banded plain concrete bed course 6 is the mixture of cement, sand and water, and in mixture, cement, sand (or aggregate chips) and water quality are than being 1:(4-6): 1.
5) by the arrangement form of the slow-adhesion prestress steel strand of waveform trend, the fixed support 10 of slow-adhesion prestress steel strand is set on the plain concrete bed course 6 of band shape, the support bracket fastened bottom of this slow-adhesion prestress steel strand embeds in banded plain concrete bed course 6, according to the corrugated trend of slow-adhesion prestress steel strand, determine location and the height (determining) of the fixed support 10 of slow-adhesion prestress steel strand when the banded plain concrete bed course of cast, then on the fixed support 10 of slow-adhesion prestress steel strand, arrange bellows 15, described slow-adhesion prestress steel strand 9 is wrapped up by gel 12, gel 12 outsides are bellowss 15, the two ends of slow-adhesion prestress steel strand are connected with the ground tackle 13 being arranged on grade beam 3 respectively,
6) pour into a mould the concrete (concrete) of retarded adhesive prestressed concrete beam 11, slow-adhesion prestress steel strand 9 is positioned at the concrete of retarded adhesive prestressed concrete beam 11; Then the concrete of casting reinforced concrete terrace 4; In retarded adhesive prestressed concrete beam 11, do not arrange reinforcing bar and only establish slow-adhesion prestress steel strand;
The material of the concrete of retarded adhesive prestressed concrete beam 11 is concrete (for existing concrete); The material of steel concrete terrace 4 is concrete and reinforcing bar (for existing concrete and reinforcing bar);
7) when the gentle adhesion prestressed concrete beam of steel concrete terrace of cast reach its design strength 75% time, slow-adhesion prestress steel strand 9 is carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle by tight slow-adhesion prestress steel strand anchor.
8) gel 12 in bellows 15 solidifies bellows and slow-adhesion prestress steel strand is linked to be to entirety.
Prove with implementing by experiment, after the method for employing the present embodiment (the various combining forms of above-mentioned label 8 and 16), there is not the phenomenon of sedimentation, cracking in the large area terrace of the building in soft layer area or factory building.
Embodiment 2:
As shown in Figure 5, substantially the same manner as Example 1, difference is: all band shape element soil zones form fenestral fabric, and banded geotextiles or banded geo-grid 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6, the layout of retarded adhesive prestressed concrete beam 11 are identical with the layout of banded plain soil zone.Described every retarded adhesive prestressed concrete beam and compounded with strip bed course thereof are vertical lateral arrangement with crossing retarded adhesive prestressed concrete beam and compounded with strip bed course thereof and form fenestral fabric.
Prove with implementing by experiment, adopting after the method for the present embodiment, there is not the phenomenon of sedimentation, cracking in the large area terrace of the building in soft layer area or factory building.
Embodiment 3:
As shown in Fig. 6, Fig. 8, substantially the same manner as Example 1, difference is: longitudinal section of described retarded adhesive prestressed concrete beam 11 is shaped as the not equal section of step wide at the top and narrow at the bottom, and (profile height of the retarded adhesive prestressed concrete beam at the square region middle part that four pillars surround is large, the profile height of the retarded adhesive prestressed concrete beam in close grade beam region is little, as shown in Figure 6).Be conducive to the formation of slow-adhesion prestress steel strand waveform and improve jacking ability and the influence basin of retarded adhesive prestressed concrete beam to terrace, reduce costs simultaneously; Described banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand or banded plain concrete bed course are step, are conducive to the layout of slow bonding steel strand and reduce costs.
Prove with implementing by experiment, adopting after the method for the present embodiment, there is not the phenomenon of sedimentation, cracking in the large area terrace of the building in soft layer area or factory building.
Embodiment 4:
As shown in Figure 7, substantially the same manner as Example 1, difference is: longitudinal section of described retarded adhesive prestressed concrete beam 11 is shaped as waveform unequal section, its underpart is waveform, the bottom of the top of retarded adhesive prestressed concrete beam 11 and steel concrete terrace 4 is at same absolute altitude, and near the section at grade beam 3 places is little, span centre section is large; Described banded geotextiles or banded geo-grid 16, banded plain concrete bed course 6, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are waveform.Be conducive to the formation of slow-adhesion prestress steel strand waveform and improve jacking ability and the influence basin of retarded adhesive prestressed concrete beam to terrace, reduce costs simultaneously; Described banded geotextiles or banded geo-grid 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand or banded plain concrete bed course are waveform, are conducive to the layout of slow bonding steel strand and reduce costs.
Prove with implementing by experiment, adopting after the method for the present embodiment, there is not the phenomenon of sedimentation, cracking in the large area terrace of the building in soft layer area or factory building.
Embodiment 5:
As shown in Figure 9, Figure 10, substantially the same manner as Example 1, difference is: the middle part of the square region surrounding at four adjacent pillars arranges second 14 and cushion cap, and retarded adhesive prestressed concrete beam 11 is located on above-mentioned cushion cap, and cushion cap is arranged on second 14.But the span of retarded adhesive prestressed concrete beam 11 is constant, be still two distances between pillar, be retarded adhesive prestressed concrete beam 11 in Fig. 9, Figure 10 be two across, steel strand be also by two across layout, add stake and cross-cut degree not, thereby can further reduce " pan bottom shape " differential settlement.Second 14 of this square region division can be 1-4, and cushion cap is located on this second 14, can further reduce the phenomenon that sedimentation, cracking appear in large area terrace.Traditional method be be provided with second 14 and cushion cap after, the just bearing using this second 14 and cushion cap as retarded adhesive prestressed concrete beam 11, the span of retarded adhesive prestressed concrete beam reduces half, be traditional method be by the retarded adhesive prestressed concrete beam 11 in Fig. 9, Figure 10 become 4 across, steel strand are also across layout by 4, make the stressed change of second 14 and cushion cap large, thereby traditional method cannot reduce " pan bottom shape " differential settlement.
Prove with implementing by experiment, adopting after the method for the present embodiment, there is not the phenomenon of sedimentation, cracking in the large area terrace of the building in soft layer area or factory building.
Embodiment 6:
Substantially the same manner as Example 1, difference is: the interior layout reinforcing bar of retarded adhesive prestressed concrete beam 11.
Prove with implementing by experiment, adopting after the method for the present embodiment, there is not the phenomenon of sedimentation, cracking in the large area terrace of the building in soft layer area or factory building.
Claims (7)
1. soft layer area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that it comprises the steps:
1) the band shape element soil zone (5) of compacting is set on the soft layer below the steel concrete terrace of design, spacing between the plain soil zone of adjacent band shape and banded plain soil zone is 2～5m, the width of banded plain soil zone is 10～50cm, and the thickness of banded plain soil zone is 10～50cm;
2) banded geotextiles or banded geo-grid (16) are set on the plain soil zone of band shape (5);
3) banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand (8) are set in banded geotextiles or banded geo-grid (16), the width of banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand is 10～50cm, and thickness is 10～100cm;
4) on banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand (8), banded plain concrete bed course (6) is set, the width of banded plain concrete bed course is 10～50cm, and thickness is 10～50cm;
5) press the arrangement form of the slow-adhesion prestress steel strand of undulate trend, the fixed support (10) of slow-adhesion prestress steel strand is set on the plain concrete bed course of band shape (6), the support bracket fastened bottom of this slow-adhesion prestress steel strand embeds in banded plain concrete bed course (6), according to the corrugated trend of slow-adhesion prestress steel strand, determine location and the height of the fixed support (10) of slow-adhesion prestress steel strand, then at the fixed support (10) of slow-adhesion prestress steel strand, above arrange bellows (15), described slow-adhesion prestress steel strand (9) is wrapped up by gel (12), gel (12) outside is bellows (15), the two ends of slow-adhesion prestress steel strand are connected with the ground tackle (13) being arranged on grade beam (3) respectively,
6) pour into a mould the concrete of retarded adhesive prestressed concrete beam (11), slow-adhesion prestress steel strand (9) is positioned at the concrete of retarded adhesive prestressed concrete beam (11); Then the concrete of casting reinforced concrete terrace (4);
7) when the gentle adhesion prestressed concrete beam of steel concrete terrace of cast reach its design strength 75% time, slow-adhesion prestress steel strand (9) is carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle by tight slow-adhesion prestress steel strand anchor;
8) gel (12) in bellows (15) solidifies bellows and slow-adhesion prestress steel strand is linked to be to entirety.
2. soft layer according to claim 1 area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that: described band shape element soil zone and banded plain soil zone are and are arranged in parallel, and the layout of banded geotextiles or banded geo-grid (16), banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand (8), banded plain concrete bed course (6), retarded adhesive prestressed concrete beam (11) is identical with the layout of banded plain soil zone.
3. soft layer according to claim 1 area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that: all band shape element soil zones form fenestral fabric, and the layout of banded geotextiles or banded geo-grid (16), banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand (8), banded plain concrete bed course (6), retarded adhesive prestressed concrete beam (11) is identical with the layout of banded plain soil zone.
4. soft layer according to claim 1 area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that: longitudinal section of described retarded adhesive prestressed concrete beam (11) is shaped as rectangle, or longitudinal section of retarded adhesive prestressed concrete beam (11) is shaped as the not equal section of up big and down small step trapezoidal or wide at the top and narrow at the bottom.
5. soft layer according to claim 1 area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that: longitudinal section of described retarded adhesive prestressed concrete beam (11) is shaped as waveform unequal section, its underpart is waveform, the bottom of the top of retarded adhesive prestressed concrete beam (11) and steel concrete terrace (4) is at same absolute altitude, and the section located near grade beam (3) is little and span centre section is large; Described banded geotextiles or banded geo-grid (16), banded plain concrete bed course (6), banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand (8) are waveform.
6. soft layer according to claim 1 area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that: the middle part of the square region surrounding at four adjacent pillars arranges second (14) and cushion cap, retarded adhesive prestressed concrete beam (11) is located on above-mentioned cushion cap, and cushion cap is arranged on second (14).
7. soft layer according to claim 1 area utilizes the method for the sedimentation of retarded adhesive prestressed concrete beam prevention large area terrace, cracking, it is characterized in that: in retarded adhesive prestressed concrete beam (11), arrange reinforcing bar.
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