CN102561381A - 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 PDFInfo
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- CN102561381A CN102561381A CN201110451681XA CN201110451681A CN102561381A CN 102561381 A CN102561381 A CN 102561381A CN 201110451681X A CN201110451681X A CN 201110451681XA CN 201110451681 A CN201110451681 A CN 201110451681A CN 102561381 A CN102561381 A CN 102561381A
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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
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 tracts of land terrace, cracking.
Background technology
At present, in weak soil district or the thicker place of soft layer, the large tracts of land terrace of building or factory building differential settlement occurs and cracking is a universal phenomenon, causes building or factory building normally not to use; In order to prevent the sedimentation and the cracking of building or factory building large tracts of land terrace, need to adopt the pile foundation arrangement form of all round victory formula, to guarantee the not sedimentation of large tracts of land terrace and not ftracture in the terrace zone; Do no doubt can guarantee not sedimentation of terrace and not ftractureing like this, but cost is high, long in time limit.The characteristics that differential settlement and cracking appear in building or factory building large tracts of land terrace are: the sedimentation at the grade beam place that is connected with post is little, and the terrace sedimentation at the middle part of the square region that four pillars surround is big, promptly so-called " pan bottom shape " differential settlement.
Bonded prestress concrete structure is a kind of form of structure of using always, but all is used for floor structure and the roof structure and the bridge construction etc. of superstructure such as building; Bonded prestress concrete structure is that (reinforcing bar+concrete) adds the bonded prestress steel strand in reinforced concrete structure; Can improve the ability of former steel bar concrete structure bearing capacity and resistance to deformation, but all be in reinforced concrete beam, to add the bonded prestress steel strand to be formed with adhesion prestressed concrete structure (reinforcing bar+concrete+bonded prestress steel strand); It is that the rectangular cross section of identical section or bearing place section is big, the span centre section is little steel bar concrete become the section beam that tradition bonded prestress steel strand are arranged in the reinforced concrete beam and beam steel bar concrete.
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 tracts of land terrace, cracking, this method is simple, easy goes, and can prevent sedimentation, the cracking of large tracts of land terrace.
To achieve these goals, the technical scheme that the present invention taked is: the soft layer area utilizes the method for the sedimentation of bonded prestress concrete beam prevention large tracts of land terrace, cracking, it is characterized in that it comprises the steps:
1) according to the distribution situation of span; The banded plain soil zone 5 of compacting is set on the soft layer below the steel concrete terrace of design; Spacing between plain soil zone of adjacent band shape and the 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 GSZ 16 are set;
3) banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are set on banded geotextiles or banded GSZ 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) 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 the banded plain concrete bed course 6; Confirm the support bracket fastened location and the height of bellows according to the corrugated trend of bonded prestress steel strand, on the fixed support of bellows, arrange bellows 10 then, bonded prestress steel strand 9 pass bellows 10; The two ends of bonded prestress steel strand 9 respectively be arranged on grade beam 3 on ground tackle 14 link to each other;
6) on the plain concrete bed course 6 of band shape, be cast with the concrete (concrete) of adhesion prestressed concrete beam 11 then, bellows 10 is positioned at the concrete of bonded prestress concrete beam 11; The casting reinforced concrete terrace 4 again; The bonded prestress concrete beam 11 interior reinforcing bars of can arranging can not arranged reinforcing bar yet and only are provided with adhesion prestress steel strand;
7) when steel concrete terrace and the bonded prestress concrete beam of cast reach its design strength 75% the time, bonded prestress steel strand 9 are carried out stretch-draw, stop stretch-draw after meeting design requirement, with ground tackle that bonded prestress steel strand anchor is tight;
8) bellows interior is carried out slip casting, injecting cement paste 12 is linked to be integral body with bellows and bonded prestress steel strand.
Plain soil zone of described band shape and banded plain soil zone are and are arranged in parallel, and the layout of banded geotextiles or banded GSZ 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 the banded plain soil zone 5 on the same vertical plane, banded geotextiles or banded GSZ 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6 and constitute compounded with strip bed courses (promptly 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 the compounded with strip bed course of every bonded prestress concrete beam and below thereof and the bonded prestress concrete beam on next door and below thereof is and is arranged in parallel.The compounded with strip bed course comprises the banded plain soil zone that is positioned on the same vertical plane, banded geotextiles or banded GSZ, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand, banded plain concrete bed course.
All banded plain soil zones constitute fenestral fabric, and the layout of banded geotextiles or banded GSZ 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 described every bonded prestress concrete beam and below thereof is in length and breadth to arranging the formation fenestral fabric with the compounded with strip bed course of bonded prestress concrete beam that intersects and below thereof.
The described grade beam that links to each other with pillar is not established prestress wire.
Vertical section configuration of described bonded prestress concrete beam 11 is a rectangle; Or vertical section configuration of bonded prestress concrete beam 11 is that (profile height of the bonded prestress concrete beam at the square region middle part that four pillars surround is big for the not equal section of up big and down small step trapezoidal or wide at the top and narrow at the bottom; Profile height near the regional bonded prestress concrete beam of grade beam is little, like Fig. 6, shown in Figure 7).
Vertical section configuration of described bonded prestress concrete beam 11 is the waveform unequal section; Its underpart is a waveform; The top of bonded prestress concrete beam 11 and the bottom of steel concrete terrace 4 be at same absolute altitude, near the section at grade beam 3 places is little and the span centre section is big; Described banded geotextiles or banded GSZ 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.
Middle part in four adjacent square region that pillar surrounded is provided with supporting pile 15 and cushion cap, and bonded prestress concrete beam 11 is located on the above-mentioned cushion cap, and cushion cap is arranged on the supporting pile 15.
The present invention adopts sedimentation, the cracking of " compound mode of the bonded prestress concrete beam of multiple shape (vertically) and section (laterally)+compounded with strip bed course structure " prevention large tracts of land terrace.Especially configuration reinforcement not in the bonded prestress concrete beam, and have only the bonded prestress steel strand, promptly plain concrete beam and bonded prestress steel strand (bonded prestress steel strand+concrete) make up, and cost is low behind the cancellation reinforcing bar, and the duration is short; And the shape of bonded prestress concrete beam (along beam vertically) (the prestressing force depth of beam at the square region middle part that four pillars surround is big for step; Prestressing force depth of beam near grade beam zone is little) or waveform (its underpart is a waveform; The bottom of top and steel bar concrete terrace is at same absolute altitude; Near the section at bearing place is little and the span centre section is big; Its objective is the formation that helps bonded prestress steel strand waveform and improve jacking ability and the influence basin of prestressed girder, reduce cost simultaneously) terrace; 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.
Confirm the size (banded plain soil zone+shape geotextiles or banded GSZ+banded hardcore bed or sand-gravel cushion or cement stabilizing layer of sand+banded plain concrete bed course) that the compounded with strip bed course is constructed according to soil layer and load situation, the jacking force upwards and the bearing capacity of banded bed course are provided simultaneously.
The invention has the beneficial effects as follows: simple, the easy row of this method, strong operability, cost is low, and the duration is short, can prevent sedimentation, the cracking of building terrace.Adopt " compound mode of the bonded prestress concrete beam of multiple shape (vertically) and section (laterally)+compounded with strip bed course structure "; The jacking force upwards and the bearing capacity of banded bed course are provided simultaneously, can prevent sedimentation, the cracking of soft layer area large tracts of land terrace.
Description of drawings
Fig. 1 is the vertical view of embodiment 1 building or factory building terrace.
Fig. 2 is along the sectional view (vertically) of A-A line among Fig. 1.
Fig. 3 is the sketch map that the bonding steel strand are arranged among the embodiment 1.
Fig. 4 is fixed support and the bellows of bellows among the embodiment 1, the sketch map of bonded prestress steel strand.
Fig. 5 is the arrangement diagram that bonded prestress concrete beam and compounded with strip bed course structure constitutes fenestral fabric among the embodiment 2.
Fig. 6 is vertical sketch map of step bonded prestress concrete beam and step compounded with strip bed course structure.
Fig. 7 is vertical sketch map 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 (among the Fig. 6 along) of step bonded prestress concrete beam and step compounded with strip bed course structure.
Fig. 9 is the vertical view of embodiment 5 buildings or factory building terrace.
Figure 10 is along the sectional view of C-C line among Fig. 9.
Among the 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, banded geotextiles of 16-or banded GSZ.
The specific embodiment
For a better understanding of the present invention, further illustrate content of the present invention, but content of the present invention is not limited only to following embodiment below in conjunction with embodiment.
Embodiment 1:
Like Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the soft layer area utilizes the method for the sedimentation of bonded prestress concrete beam prevention large tracts of land terrace, cracking, and it comprises the steps:
1) according to the distribution situation of span; The banded plain soil zone 5 of compacting is set on the soft layer below the steel concrete terrace of design; Spacing between plain soil zone of adjacent band shape and the 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 a clay;
Banded plain soil zone and banded plain soil zone are and are arranged in parallel, and the layout of banded geotextiles or banded GSZ 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 the banded plain soil zone 5 on the same vertical plane, banded geotextiles or banded GSZ 16, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded plain concrete bed course 6 and constitute compounded with strip bed courses (promptly 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 the compounded with strip bed course of every bonded prestress concrete beam and below thereof and the bonded prestress concrete beam on next door and below thereof is and is arranged in parallel.The compounded with strip bed course comprises the banded plain soil zone that is positioned on the same vertical plane, banded geotextiles or banded GSZ, 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 GSZ 16 are set;
3) banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8 are set on banded geotextiles or banded GSZ 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 beds is a rubble; Material when being banded sand-gravel cushion is a sandstone, and the material when being banded cement stabilizing layer of sand is the mixture of cement, sand (or aggregate chips) and water.Cement, sand (or aggregate chips) and quality ratio are 1 in the mixture: (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.Cement, sand (or aggregate chips) and quality ratio are 1 in the mixture: (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 the banded plain concrete bed course 6; Confirm the support bracket fastened location and the height of bellows according to the corrugated trend of bonded prestress steel strand, on the fixed support of bellows, arrange bellows 10 then, bonded prestress steel strand 9 pass bellows 10; The two ends of bonded prestress steel strand 9 respectively be arranged on grade beam 3 on ground tackle 14 link to each other; Grade beam 3 is fixed on the pillar 2, and the lower end of pillar 2 is fixed on the patten 1, and patten 1 is arranged in the stake 7;
6) on the plain concrete bed course 6 of band shape, be cast with the concrete (concrete) of adhesion prestressed concrete beam 11 then, bellows 10 is positioned at the concrete of bonded prestress concrete beam 11; The casting reinforced concrete terrace 4 again; Do not arrange reinforcing bar in the bonded prestress concrete beam 11 and only be provided with adhesion prestress steel strand; The material of bonded prestress concrete beam 11 is concrete (for available coagulation soil); The material of steel concrete terrace 4 is concrete and reinforcing bar (for available coagulation soil and reinforcing bar);
7) when steel concrete terrace and the bonded prestress concrete beam of cast reach its design strength 75% the time, bonded prestress steel strand 9 are carried out stretch-draw, stop stretch-draw after meeting design requirement, with ground tackle that bonded prestress steel strand anchor is tight;
8) bellows interior is carried out slip casting, injecting cement paste 12 is linked to be integral body with bellows and bonded prestress steel strand.
Through experiment with implement proof, adopt the method for present embodiment after (above-mentioned label 8 with 16 various combining forms), the phenomenon of sedimentation, cracking does not appear in the building that soft layer is regional or the large tracts of land terrace of factory building.
Embodiment 2:
As shown in Figure 5; Basic identical with embodiment 1; Difference is: all banded plain soil zones constitute fenestral fabric, and the layout of banded geotextiles or banded GSZ 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 described every bonded prestress concrete beam and below thereof is in length and breadth to arranging the formation fenestral fabric with the compounded with strip bed course of bonded prestress concrete beam that intersects and below thereof.
Through experiment and enforcement proof, after the method for employing present embodiment, the phenomenon of sedimentation, cracking does not appear in the building in soft layer area or the large tracts of land terrace of factory building.
Embodiment 3:
Like Fig. 6, shown in Figure 8; Basic identical with embodiment 1; Difference is: vertical section configuration of described bonded prestress concrete beam 11 is that (profile height of the bonded prestress concrete beam at the square region middle part that four pillars surround is big for the not equal section of step wide at the top and narrow at the bottom; Profile height near the regional bonded prestress concrete beam of grade beam is little); Help the formation of bonded prestress steel strand waveform and improve jacking ability and the influence basin of bonded prestress concrete beam, reduce cost simultaneously terrace; The plain concrete bed course of described band shape 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 help boning and reducing cost.
Through experiment and enforcement proof, after the method for employing present embodiment, the phenomenon of sedimentation, cracking does not appear in the building in soft layer area or the large tracts of land terrace of factory building.
Embodiment 4:
As shown in Figure 7; Basic identical with embodiment 1, difference is: vertical section configuration of described bonded prestress concrete beam 11 is the waveform unequal section, and its underpart is a waveform; The bottom of top and steel concrete terrace 4 is at same absolute altitude; The span centre section is big near the section at grade beam 3 places is little, helps the formation of bonded prestress steel strand waveform and improves jacking ability and the influence basin of bonded prestress concrete beam to terrace, reduces cost simultaneously; The plain concrete bed course of described band shape 6, banded hardcore bed or banded sand-gravel cushion or banded cement stabilizing layer of sand 8, banded geotextiles or banded GSZ 16 are waveform, the layout of the steel strand that help boning and reduce the phenomenon that sedimentation, cracking appear in terrace.
Through experiment and enforcement proof, after the method for employing present embodiment, the phenomenon of sedimentation, cracking does not appear in the building in soft layer area or the large tracts of land terrace of factory building.
Embodiment 5:
Like Fig. 9, shown in Figure 10; Basic identical with embodiment 1, difference is: the middle part in four adjacent square region that pillar surrounded is provided with supporting pile 15 and cushion cap, and bonded prestress concrete beam 11 is located on the above-mentioned cushion cap; Cushion cap is arranged on the supporting pile 15; But the span of bonded prestress concrete beam 11 is constant still is two distances between the pillar, and promptly the bonded prestress concrete beam 11 among Fig. 9, Figure 10 is two to stride, and steel strand also are to stride layout by two; Promptly add stake and cross-cut degree not, thereby can further reduce " pan bottom shape " differential settlement.The supporting pile 15 that this square region is provided with can be the 1-4 root, and cushion cap is located on this supporting pile 15, can further reduce the phenomenon that sedimentation, cracking appear in the large tracts of land terrace.Traditional method is after being provided with supporting pile 15 and cushion cap; Just with this supporting pile 15 and the bearing of cushion cap as bonded prestress concrete beam 11; The span of bonded prestress concrete beam reduces half the, and promptly traditional method is the bonded prestress concrete beam 11 among Fig. 9, Figure 10 to be become 4 stride, and steel strand also are to stride layout by 4; Make that the stressed change of supporting pile 15 and cushion cap is big, thereby traditional method can't reduce " pan bottom shape " differential settlement.
Through experiment and enforcement proof, after the method for employing present embodiment, the phenomenon of sedimentation, cracking does not appear in the building in soft layer area or the large tracts of land terrace of factory building.
Embodiment 6:
Basic identical with embodiment 1, difference is: arrange reinforcing bar in the bonded prestress concrete beam 11.
Through experiment and enforcement proof, after the method for employing present embodiment, the phenomenon of sedimentation, cracking does not appear in the building in soft layer area or the large tracts of land terrace of factory building.
Claims (7)
1. the soft layer area utilizes the method for the sedimentation of bonded prestress concrete beam prevention large tracts of land terrace, cracking, it is characterized in that it comprises the steps:
1) the banded plain soil zone (5) of compacting is set on the soft layer below the steel concrete terrace of design; Spacing between plain soil zone of adjacent band shape and the 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 GSZ (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 on banded geotextiles or banded GSZ (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) 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 of band shape (6); The support bracket fastened bottom of this bellows embeds in the banded plain concrete bed course (6); According to the corrugated trend of bonded prestress steel strand confirm bellows support bracket fastened location and the height, on the fixed support of bellows, arrange bellows (10) then, bonded prestress steel strand (9) pass bellows (10); The two ends of bonded prestress steel strand (9) respectively be arranged on grade beam (3) on ground tackle (14) link to each other;
6) on the plain concrete bed course of band shape (6), be cast with the concrete of adhesion prestressed concrete beam (11) then, bellows (10) is positioned at the concrete of bonded prestress concrete beam (11); Casting reinforced concrete terrace (4) again;
7) when steel concrete terrace and the bonded prestress concrete beam of cast reach its design strength 75% the time, bonded prestress steel strand (9) are carried out stretch-draw, stop stretch-draw after meeting design requirement, with ground tackle that bonded prestress steel strand anchor is tight;
8) bellows interior is carried out slip casting, injecting cement paste (12) is linked to be integral body with 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 tracts of land 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 GSZ (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 tracts of land terrace, cracking; It is characterized in that: all banded plain soil zones constitute fenestral fabric, and the layout of banded geotextiles or banded GSZ (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 tracts of land terrace, cracking; It is characterized in that: vertical section configuration of described bonded prestress concrete beam (11) is a rectangle, or vertical section configuration of bonded prestress concrete beam (11) is 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 tracts of land terrace, cracking; It is characterized in that: vertical section configuration of described bonded prestress concrete beam (11) is the waveform unequal section; Its underpart is a 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 of locating near grade beam (3) is little and the span centre section is big; Described banded geotextiles or banded GSZ (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 tracts of land terrace, cracking; It is characterized in that: the middle part in four adjacent square region that pillar surrounded is provided with supporting pile (15) and cushion cap; Bonded prestress concrete beam (11) is located on the above-mentioned cushion cap, and cushion cap is arranged on the supporting pile (15).
7. soft layer according to claim 1 area utilizes the method for the sedimentation of bonded prestress concrete beam prevention large tracts of land terrace, cracking, it is characterized in that: be furnished with reinforcing bar in the bonded prestress concrete beam (11).
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| CN105350559A (en) * | 2015-11-27 | 2016-02-24 | 中国一冶集团有限公司 | Construction method suitable for emery structural ground of large factory building |
| CN109487748A (en) * | 2018-06-02 | 2019-03-19 | 深圳市深水水务咨询有限公司 | Nearby Structure depth riverbed quaywall supporting construction and construction method |
| CN110005169A (en) * | 2019-04-12 | 2019-07-12 | 中国启源工程设计研究院有限公司 | A kind of cracking resistance process with stressed seamless terrace |
| CN111691640A (en) * | 2020-06-29 | 2020-09-22 | 海通建设集团有限公司 | Prestressed seamless terrace and construction method thereof |
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