CN102561381B - Method for preventing settling and cracking of large-area terrace by using bonded prestressed concrete beams in soft soil layer region - Google Patents

Method for preventing settling and cracking of large-area terrace by using bonded prestressed concrete beams in soft soil layer region Download PDF

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Publication number
CN102561381B
CN102561381B CN201110451681.XA CN201110451681A CN102561381B CN 102561381 B CN102561381 B CN 102561381B CN 201110451681 A CN201110451681 A CN 201110451681A CN 102561381 B CN102561381 B CN 102561381B
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banded
concrete
bonded prestress
terrace
sand
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CN201110451681.XA
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CN102561381A (en
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王平
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中国一冶集团有限公司
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Abstract

The invention relates to a method for preventing settling and cracking of a large-area terrace by using bonded prestressed concrete beams in a soft soil layer region. The method is characterized by comprising the following steps of: 1) arranging a rammed pure soil belt on a soft soil layer below the designed reinforced concrete terrace; 2) arranging a strip geotextile or a strip geogrid; 3) arranging a strip broken stone cushion layer or a strip gravel cushion layer or a strip cement stabilized sand layer; 4) arranging a strip pure concrete cushion layer; 5) arranging a corrugated pipe on a fixing support of the corrugated pipe, and making a bonded prestressed steel stranded wire penetrate through the corrugated pipe; 6) pouring concrete of the bonded prestressed concrete beams on the strip pure concrete cushion layer, and then pouring a prestressed concrete terrace; 7) when the poured prestressed concrete terrace and the bonded prestressed concrete beams reach 75 percent of design strength, tensioning the bonded prestressed steel stranded wire; and 8) pouring slurry into the corrugated pipe to connect the corrugated pipe and the bonded prestressed steel stranded wire into a whole. The method is simple and feasible, and can prevent settling and cracking of the large-area terrace.

Description

Soft layer area utilizes the method for the sedimentation of bonded prestress concrete beam prevention large area terrace, cracking
Technical field
The present invention relates to the method that a kind of soft layer area utilizes the sedimentation of bonded prestress 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.
Bonded prestress 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.; Bonded prestress concrete structure is that (reinforcing bar+concrete) adds bonded 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 bonded prestress steel strand to be formed with adhesion prestressed concrete structure (reinforcing bar+concrete+bonded prestress steel strand); Tradition bonded prestress steel strand are 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 bonded prestress 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 bonded prestress 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) 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 that 10~50cm, thickness are 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 bonded prestress steel strand of undulate trend, the fixed support 13 of bellows is set on the plain concrete bed course 6 of band shape, the support bracket fastened bottom of this bellows embeds in banded plain concrete bed course 6, according to the corrugated trend of bonded prestress steel strand, determine support bracket fastened location and the height of bellows, then on the fixed support of bellows, arrange bellows 10, bonded prestress steel strand 9 are through bellows 10; The two ends of bonded prestress steel strand 9 are connected with the ground tackle 14 being arranged on grade beam 3 respectively;
6) then at the concrete (concrete) of the plain concrete bed course 6 upper bonded prestress concrete beams 11 of band shape, bellows 10 is positioned at the concrete of bonded prestress concrete beam 11; Casting reinforced concrete terrace 4 again; In bonded prestress concrete beam 11, can arrange that reinforcing bar also can not arrange reinforcing bar and only be provided with adhesion prestress steel strand;
7) when cast steel concrete terrace and bonded prestress concrete beam reach its design strength 75% time, bonded prestress steel strand 9 are carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle, bonded prestress steel strand anchor is tight;
8) bellows interior is carried out to slip casting, injecting cement paste 12 is linked to be integral body by bellows and bonded prestress steel strand.
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, bonded prestress concrete beam 11 is 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 courses (be positioned on the plain soil zone 5 of same band shape, with and banded plain soil zone 5).The compounded with strip bed course of every bonded prestress concrete beam and the compounded with strip bed course of below and the bonded prestress concrete beam on side and below thereof is and is arranged in parallel.Compounded with strip bed course comprises the band shape element soil zone being positioned on same vertical plane, banded geotextiles or banded geo-grid, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand, banded plain concrete bed course.
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, bonded prestress concrete beam 11 is identical with the layout of banded plain soil zone.The compounded with strip bed course of the compounded with strip bed course of described every bonded prestress concrete beam and below thereof and crossing bonded prestress concrete beam and below thereof is vertical lateral arrangement and forms fenestral fabric.
The described grade beam being connected with pillar is not established prestress wire.
Longitudinal section of described bonded prestress concrete beam 11 is shaped as rectangle, or longitudinal section of bonded prestress 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 bonded prestress concrete beam at the square region middle part that four pillars surround is large, the profile height of the bonded prestress concrete beam in close grade beam region is little, as shown in Figure 6, Figure 7).
Longitudinal section of described bonded prestress concrete beam 11 is shaped as waveform unequal section, its underpart is waveform, the top of bonded prestress concrete beam 11 and the bottom of steel concrete terrace 4 be 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 supporting pile 15 and cushion cap, and bonded prestress concrete beam 11 is located on above-mentioned cushion cap, and cushion cap is arranged on supporting pile 15.
The present invention adopts sedimentation, the cracking of " combination of bonded prestress concrete beam+compounded with strip bed course structure of various shape (longitudinally) and section (laterally) " prevention large area terrace.Especially configuration reinforcement not in bonded prestress concrete beam, and only have bonded prestress steel strand, plain concrete beam and bonded prestress steel strand (bonded prestress steel strand+concrete) combine, cancel reinforcing bar after cost low, the duration is short; And the shape of bonded prestress 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 bonded prestress steel strand waveform and improve jacking ability and the influence basin of prestressed girder to terrace, reduce costs simultaneously); The section of bonded prestress concrete beam (along beam laterally) be not equal section of rectangle or up big and down small 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+shape geotextiles or banded geo-grid+banded hardcore bed or sand-gravel cushion or cement stabilizing layer of sand+banded plain concrete bed course) that compounded with strip bed course is constructed, jacking force upwards and the bearing capacity of banded bed course are provided simultaneously.
The invention has the beneficial effects as follows: the method simply, is easily gone, strong operability, cost is low, and the duration is short, can prevent sedimentation, the cracking of building terrace.Adopt " combination of bonded prestress 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 along the sectional view (longitudinally) of A-A line in Fig. 1.
Fig. 3 is the schematic diagram that has bonding steel strand in embodiment 1.
Fig. 4 is the schematic diagram of the fixed support of bellows in embodiment 1 and bellows, bonded prestress steel strand.
Fig. 5 is the arrangement diagram that in embodiment 2, bonded prestress concrete beam and compounded with strip bed course structure forms fenestral fabric.
Fig. 6 is longitudinal schematic diagram of step bonded prestress concrete beam and step compounded with strip bed course structure.
Fig. 7 is longitudinal schematic diagram of wave bonded prestress concrete beam 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 step bonded prestress concrete beam 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 along the sectional view of 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-bonded prestress steel strand, 10-bellows, 11-bonded prestress concrete beam, 12-injecting cement paste, the fixed support of 13-bellows, 14-ground tackle, 15-supporting pile, 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 bonded prestress concrete beam prevention large area terrace, cracking, and 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;
Banded plain 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, bonded prestress concrete beam 11 is 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 courses (be positioned on the plain soil zone 5 of same band shape, with and banded plain soil zone 5); The compounded with strip bed course of every bonded prestress concrete beam and the compounded with strip bed course of below and the bonded prestress concrete beam on side and below thereof is and is arranged in parallel.Compounded with strip bed course comprises the band shape element soil zone being positioned on same vertical plane, banded geotextiles or banded geo-grid, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand, banded plain concrete bed course.
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 that 10~50cm, thickness are 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, and the material while being banded cement stabilizing layer of sand is the mixture of cement, sand (or aggregate chips) and water.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 (or aggregate chips) and water.In mixture, cement, sand (or aggregate chips) and water quality are than being 1:(4-6): 1.
5) by the arrangement form of the bonded prestress steel strand of waveform trend, the fixed support 13 of bellows is set on the plain concrete bed course 6 of band shape, the support bracket fastened bottom of this bellows embeds in banded plain concrete bed course 6, according to the corrugated trend of bonded prestress steel strand, determine support bracket fastened location and the height of bellows, then on the fixed support of bellows, arrange bellows 10, bonded prestress steel strand 9 are through bellows 10; The two ends of bonded prestress steel strand 9 are connected with the ground tackle 14 being arranged on grade beam 3 respectively; Grade beam 3 is fixed on pillar 2, and the lower end of pillar 2 is fixed on patten 1, and patten 1 is arranged in stake 7;
6) then at the concrete (concrete) of the plain concrete bed course 6 upper bonded prestress concrete beams 11 of band shape, bellows 10 is positioned at the concrete of bonded prestress concrete beam 11; Casting reinforced concrete terrace 4 again; In bonded prestress concrete beam 11, do not arrange reinforcing bar and be only provided with adhesion prestress steel strand; The material of bonded prestress 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 cast steel concrete terrace and bonded prestress concrete beam reach its design strength 75% time, bonded prestress steel strand 9 are carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle, bonded prestress steel strand anchor is tight;
8) bellows interior is carried out to slip casting, injecting cement paste 12 is linked to be integral body by bellows and bonded prestress steel strand.
By experiment with implement proof, adopt after the method for the present embodiment (above-mentioned label 8 and 16 various combining forms), 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 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, bonded prestress concrete beam 11 is identical with the layout of banded plain soil zone.The compounded with strip bed course of the compounded with strip bed course of described every bonded prestress concrete beam and below thereof and crossing bonded prestress concrete beam and below thereof is vertical lateral arrangement and forms 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 bonded prestress 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 bonded prestress concrete beam at the square region middle part that four pillars surround is large, the profile height of the bonded prestress concrete beam in close grade beam region is little), be conducive to the formation of bonded prestress steel strand waveform and improve jacking ability and the influence basin of bonded prestress concrete beam to terrace, reduce costs simultaneously; Described band shape element concrete bed course 6, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are step, the layout of the steel strand that are conducive to bond and reducing 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 bonded prestress concrete beam 11 is shaped as waveform unequal section, its underpart is waveform, the bottom of top and steel concrete terrace 4 is at same absolute altitude, near the section at grade beam 3 places is little, span centre section is large, is conducive to the formation of bonded prestress steel strand waveform and improves jacking ability and the influence basin of bonded prestress concrete beam to terrace, reduces costs simultaneously; Described band shape element concrete bed course 6, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded geotextiles or banded geo-grid 16 are waveform, and the layout of steel strand and the phenomenon that sedimentation, cracking appear in minimizing terrace are conducive to bond.
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 supporting pile 15 and cushion cap, bonded prestress concrete beam 11 is located on above-mentioned cushion cap, cushion cap is arranged on supporting pile 15, but the span of bonded prestress concrete beam 11 is constant, be still two distances between pillar, be bonded prestress concrete beam 11 in Fig. 9, Figure 10 be two across, steel strand are also across layout by two, add stake and cross-cut degree not, thereby can further reduce " pan bottom shape " differential settlement.The supporting pile 15 of this square region division can be 1-4, and cushion cap is located on this supporting pile 15, can further reduce the phenomenon that sedimentation, cracking appear in large area terrace.Traditional method is after being provided with supporting pile 15 and cushion cap, the bearing using this supporting pile 15 and cushion cap as bonded prestress concrete beam 11 just, the span of bonded prestress concrete beam reduces half, be traditional method be by the bonded prestress concrete beam 11 in Fig. 9, Figure 10 become 4 across, steel strand are also across layout by 4, make the stressed change of supporting pile 15 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 bonded prestress 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 bonded prestress 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 that 10~50cm, thickness are 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 bonded prestress steel strand of undulate trend, the fixed support (13) of bellows is set on the plain concrete bed course of band shape (6), the support bracket fastened bottom of this bellows embeds in banded plain concrete bed course (6), according to the corrugated trend of bonded prestress steel strand, determine support bracket fastened location and the height of bellows, then on the fixed support of bellows, arrange bellows (10), bonded prestress steel strand (9) are through bellows (10); The two ends of bonded prestress steel strand (9) are connected with the ground tackle (14) being arranged on grade beam (3) respectively;
6) then at the concrete of the plain concrete bed course of band shape (6) upper bonded prestress concrete beam (11), bellows (10) is positioned at the concrete of bonded prestress concrete beam (11); Casting reinforced concrete terrace (4) again;
7) when cast steel concrete terrace and bonded prestress concrete beam reach its design strength 75% time, bonded prestress steel strand (9) are carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle, bonded prestress steel strand anchor is tight;
8) bellows interior is carried out to slip casting, injecting cement paste (12) is linked to be integral body by bellows and bonded prestress steel strand.
2. soft layer according to claim 1 area utilizes the method for the sedimentation of bonded prestress concrete beam prevention large area terrace, cracking, it is characterized in that: banded plain 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), bonded prestress 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 bonded prestress 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), bonded prestress 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 bonded prestress concrete beam prevention large area terrace, cracking, it is characterized in that: longitudinal section of described bonded prestress concrete beam (11) is shaped as rectangle, or longitudinal section of bonded prestress 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 bonded prestress concrete beam prevention large area terrace, cracking, it is characterized in that: longitudinal section of described bonded prestress concrete beam (11) is shaped as waveform unequal section, its underpart is waveform, the bottom of the top of bonded prestress 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 bonded prestress 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 supporting pile (15) and cushion cap, bonded prestress concrete beam (11) is located on above-mentioned cushion cap, and cushion cap is arranged on supporting pile (15).
7. soft layer according to claim 1 area utilizes the method for the sedimentation of bonded prestress concrete beam prevention large area terrace, cracking, it is characterized in that: in bonded prestress concrete beam (11), be furnished with reinforcing bar.
CN201110451681.XA 2011-12-29 2011-12-29 Method for preventing settling and cracking of large-area terrace by using bonded prestressed concrete beams in soft soil layer region CN102561381B (en)

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