CN102535502B - Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer - Google Patents
Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer Download PDFInfo
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Abstract
The invention relates to a method for preventing the settling and the cracking of a terrace with large area by utilizing combined prestressing concrete beams at a region with a soft soil layer. The invention is characterized in that the method for preventing the settling and the cracking of the terrace with the large area by utilizing the combined prestressing concrete beams at the region with the soft soil layer comprises the following steps that: (1) a tamped belt-shaped plain soil belt is arranged; (2) a belt-shaped geotextile or a belt-shaped geogrid is arranged; (3) a belt-shaped broken-stone cushion layer or a belt-shaped sand-stone cushion layer or a belt-shaped cement-stabilizing sand layer is arranged; (4) a belt-shaped plain concrete cushion layer is arranged; (5) a prestressing steel stranded wire combining body is the combination of two random kinds or three random kinds of a steel stranded wire with adhesive prestressing force, a steel stranded wire with slow adhesive prestressing force and a steel stranded wire with no adhesive prestressing force, and the prestressing steel stranded wire combining body is arranged by adopting one random mode of the two following modes: (1) the prestressing steel stranded wire combining body is arranged in the same prestressing concrete beam; and (2) the combination of the two random kinds or the three random kinds of the steel stranded wire with the adhesive prestressing force, the steel stranded wire with the slow adhesive prestressing force and the steel stranded wire with no adhesive prestressing force is respectively arranged in different prestressing concrete beams; (6) the concrete of the prestressing concrete beams is poured, and then the concrete of a reinforced concrete terrace is poured; and (7) the operation of stretching is carried out. The method is simple and easy and can be used for preventing the settling and the cracking of a terrace with large area.
Description
Technical field
The present invention relates to the method that a kind of soft layer area utilizes the sedimentation of combined 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.
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.; Prestress concrete structure is that (reinforcing bar+concrete) adds prestress wire 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 prestress wire to form prestress concrete structure (reinforcing bar+concrete+prestress wire); Tradition prestress wire 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.
Also in same beam, do not arrange two kinds of prestress wires simultaneously, in odd number beam and even number beam, adopt respectively two kinds of prestress wires yet.
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 combined 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 combined 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) 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;
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 prestress wire assembly of waveform trend, on the plain concrete bed course 6 of band shape, fixed support 13 is set, this support bracket fastened bottom embeds in banded plain concrete bed course 6, determines support bracket fastened location and height according to the corrugated trend of prestress wire assembly when pouring into a mould banded plain concrete bed course;
Prestress wire assembly is any two or the combination of three kinds in bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand, adopts any one mode arrangement prestress steel strand assembly in following two kinds:
1. prestress wire assembly is arranged in same prestress concrete beam 11;
2. the combination of any two in bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand or three kinds, is arranged in different prestress concrete beam 11;
When adopting bonded prestress steel strand, on fixed support, arrange bellows, bonded prestress steel strand are through bellows; The two ends of bonded prestress steel strand are connected with the ground tackle 14 being arranged on grade beam 3 respectively;
When adopting slow-adhesion prestress steel strand, on fixed support 13, arrange bellows 10, described slow-adhesion prestress steel strand 9 is through bellows 10, slow-adhesion prestress steel strand 9 is wrapped up by gel 12, gel 12 outsides are bellowss 10, and the two ends of slow-adhesion prestress steel strand are connected with the ground tackle 14 being arranged on grade beam 3 respectively;
When adopting un-bonded prestressed steel strand, on fixed support 13, arrange un-bonded prestressed steel strand, the two ends of un-bonded prestressed steel strand 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 prestress concrete beams 11 of band shape, then the concrete of casting reinforced concrete terrace 4 (concrete);
7) when cast steel concrete terrace and prestress concrete beam reach its design strength 75% time, prestress wire assembly is carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle, prestress wire anchor is tight;
8) when adopting bonded prestress steel strand, bellows interior is carried out to slip casting, injecting cement paste 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 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 prestress 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 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 prestress concrete beam and the compounded with strip bed course of below and the 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.
Described band shape element soil zone forms 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 prestress concrete beam 11 are 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 prestress concrete beam and below thereof and crossing 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.
Can arrange that reinforcing bar also can not arrange reinforcing bar and only establish prestress wire in prestress concrete beam (11).
Longitudinal section of described prestress concrete beam is shaped as rectangle, or longitudinal section of 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 prestress concrete beam at the square region middle part that four pillars surround is large, the profile height of the prestress concrete beam in close grade beam region is little, as shown in Figure 6, Figure 7).
Longitudinal section of described prestress concrete beam 11 is shaped as waveform unequal section, and its underpart is waveform, and the bottom of the top of prestress 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 band shape element 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 stake 15 and cushion cap, and prestress concrete beam 11 is located on above-mentioned cushion cap, and cushion cap is arranged in stake 15.
The present invention adopts sedimentation, the cracking of " combination of prestress concrete beam+compounded with strip bed course structure of various shape and section " prevention large area terrace.Especially configuration reinforcement not in prestress concrete beam, and only have prestress wire, plain concrete beam and prestress wire (prestress wire+concrete) combine, cancel reinforcing bar after cost low, the duration is short; And the shape of prestress concrete beam (along beam longitudinally) for step, (the prestress concrete depth of beam at the square region middle part that four pillars surround is large, prestress concrete 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 prestress wire waveform and improve jacking ability and the influence basin of prestress concrete beam to terrace, reduce costs simultaneously); The section of 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+banded 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 prestress concrete beam of combination is that two or three prestress wire is combined in same beam (as slow-adhesion prestress steel strand+un-bonded prestressed steel strand, slow-adhesion prestress steel strand+bonded prestress steel strand, un-bonded prestressed steel strand+bonded prestress steel strand etc.) or odd number beam adopt a kind of prestress wire, even number beam adopts another kind of prestress wire (as odd number beam adopts slow-adhesion prestress steel strand, even number beam adopts un-bonded prestressed steel strand or odd number beam to adopt slow-adhesion prestress steel strand, even number beam adopts bonded prestress steel strand or odd number beam to adopt un-bonded prestressed steel strand, even number beam adopts bonded prestress steel strand).
The advantage of the prestress concrete beam of combination is to bring into play advantage separately, maximizes favourable factors and minimizes unfavourable ones.
The invention has the beneficial effects as follows: adopt " combination of prestress concrete beam+compounded with strip bed course structure of the combination 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; The method strong operability, cost is low, and the duration is short, can prevent sedimentation, the cracking of building 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 of 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 schematic diagram of fixed support and slow-adhesion prestress steel strand in embodiment 1.
Fig. 5 is the arrangement diagram that in embodiment 2, combined prestress concrete beam and compounded with strip bed course structure forms fenestral fabric.
Fig. 6 is longitudinal schematic diagram of step type combination prestress concrete beam and step compounded with strip bed course structure.
Fig. 7 is longitudinal schematic diagram of wave combined 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 type combination 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-slow-adhesion prestress steel strand (prestress wire assembly), 10-bellows, 11-prestress concrete beam, 12-gel, 13-fixed support, 14-ground tackle, 15-stake, the banded geotextiles of 16-or banded geo-grid.
The specific embodiment
Embodiment 1:
As shown in Figure 1, Figure 2, Figure 3, Figure 4, soft layer area utilizes the method for the sedimentation of combined 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;
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, 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 prestress wire assembly of waveform trend, on the plain concrete bed course 6 of band shape, fixed support 13 is set, this support bracket fastened bottom embeds in banded plain concrete bed course 6, determines support bracket fastened location and height according to the corrugated trend of prestress wire assembly when pouring into a mould banded plain concrete bed course;
Prestress wire assembly is the combination of bonded prestress steel strand, slow-adhesion prestress steel strand, and bonded prestress steel strand, slow-adhesion prestress steel strand are arranged in different prestress concrete beam 11;
On fixed support, arrange bellows, bonded prestress steel strand are through bellows; The two ends of bonded prestress steel strand 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;
On fixed support 13, arrange bellows 10, described slow-adhesion prestress steel strand 9 is through bellows 10, slow-adhesion prestress steel strand 9 is wrapped up by gel 12, and gel 12 outsides are bellowss 10, and the two ends of slow-adhesion prestress steel strand 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 prestress concrete beams 11 of band shape, then the concrete of casting reinforced concrete terrace 4 (concrete); In prestress concrete beam 11, can arrange that reinforcing bar also can not arrange reinforcing bar and only establish prestress wire;
The material of 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 prestress concrete beam reach its design strength 75% time, prestress wire assembly is carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle, prestress wire anchor is tight;
8) when adopting bonded prestress steel strand, bellows interior is carried out to slip casting, injecting cement paste is linked to be integral body by bellows and bonded prestress steel strand; While adopting slow-adhesion prestress steel strand, the gel in bellows solidifies bellows and slow-adhesion prestress steel strand is linked to be to integral body.
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 prestress 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 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 prestress concrete beam and the compounded with strip bed course of below and the 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.
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: described band shape element soil zone forms 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 prestress concrete beam 11 are 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 prestress concrete beam and below thereof and crossing prestress concrete beam and below thereof is vertical lateral arrangement and forms fenestral fabric.
Experiment and enforcement proof, adopt after the method for the present embodiment, and the phenomenon of sedimentation, cracking does not appear 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 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 prestress concrete beam at the square region middle part that four pillars surround is large, the profile height of the prestress concrete beam in close grade beam region is little), be conducive to the formation of bonded prestress steel strand (slow-adhesion prestress steel strand) waveform and improve jacking ability and the influence basin of prestress concrete beam to terrace, reducing 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: described prestress concrete beam (11) is waveform unequal section, 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, is conducive to the formation of prestress wire waveform and improves jacking ability and the influence basin of prestress concrete beam to terrace, reduces costs simultaneously; Described 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 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 stake 15 and cushion cap, prestress concrete beam 11 is located on above-mentioned cushion cap, cushion cap is arranged in stake 15, but the span of prestress concrete beam 11 is constant, be still two distances between pillar, be 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 stake 15 of this square region division can be 1-4, and cushion cap is located on this stake 15, can further reduce the phenomenon that sedimentation, cracking appear in large area terrace.Traditional method is after being provided with stake 15 and cushion cap, just using this 15 and cushion cap as the bearing of prestress concrete beam 11, the span of prestress concrete beam reduces half, be traditional method be by the prestress concrete beam in Fig. 9, Figure 10 11 become 4 across, steel strand are also across layout by 4, make the stressed change of stake 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: bonded prestress steel strand, slow-adhesion prestress steel strand are arranged in same 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.
Embodiment 7:
Substantially the same manner as Example 1, difference is: prestress wire assembly is the combination of bonded prestress steel strand, un-bonded prestressed steel strand, and bonded prestress steel strand, un-bonded prestressed steel strand are arranged in different 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.
Embodiment 8:
Substantially the same manner as Example 1, difference is: prestress wire assembly is the combination of slow-adhesion prestress steel strand, un-bonded prestressed steel strand, and slow-adhesion prestress steel strand, un-bonded prestressed steel strand are arranged in different 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.
Embodiment 9:
Substantially the same manner as Example 1, difference is: prestress wire assembly is the combination of bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand, and bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand are arranged in different 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.
Embodiment 10:
Substantially the same manner as Example 1, difference is: prestress wire assembly is the combination of bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand, and bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand are arranged in same 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 (6)
1. soft layer area utilizes the method for the sedimentation of combined 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 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) by the arrangement form of the prestress wire assembly of waveform trend, fixed support (13) is set on the plain concrete bed course of band shape (6), this support bracket fastened bottom embeds in banded plain concrete bed course (6), determines support bracket fastened location and height according to the corrugated trend of prestress wire assembly when pouring into a mould banded plain concrete bed course;
Prestress wire assembly is any two or the combination of three kinds in bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand, adopts any one mode arrangement prestress steel strand assembly in following two kinds:
1. prestress wire assembly is arranged in same prestress concrete beam (11);
2. the combination of any two in bonded prestress steel strand, slow-adhesion prestress steel strand, un-bonded prestressed steel strand or three kinds, is arranged in different prestress concrete beam (11);
When adopting bonded prestress steel strand, on fixed support, arrange bellows, bonded prestress steel strand are through bellows; The two ends of bonded prestress steel strand are connected with the ground tackle (14) being arranged on grade beam (3) respectively;
When adopting slow-adhesion prestress steel strand, at the upper bellows (10) of arranging of fixed support (13), described slow-adhesion prestress steel strand (9) is through bellows (10), slow-adhesion prestress steel strand (9) is wrapped up by gel (12), gel (12) outside is bellows (10), and the two ends of slow-adhesion prestress steel strand are connected with the ground tackle (14) being arranged on grade beam (3) respectively;
When adopting un-bonded prestressed steel strand, at the upper un-bonded prestressed steel strand of arranging of fixed support (13), the two ends of un-bonded prestressed steel strand 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 prestress concrete beam (11), then the concrete of casting reinforced concrete terrace (4);
7) when cast steel concrete terrace and prestress concrete beam reach its design strength 75% time, prestress wire assembly is carried out to stretch-draw, after meeting design requirement, stop stretch-draw, with ground tackle, prestress wire anchor is tight;
8) when adopting bonded prestress steel strand, bellows interior is carried out to slip casting, injecting cement paste 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 combined prestress 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), 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 combined prestress concrete beam prevention large area terrace, cracking, it is characterized in that: described band shape element soil zone forms 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), 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 combined prestress concrete beam prevention large area terrace, cracking, it is characterized in that: longitudinal section of described prestress concrete beam is shaped as rectangle, or longitudinal section of 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 combined prestress concrete beam prevention large area terrace, cracking, it is characterized in that: longitudinal section of described prestress concrete beam (11) is shaped as waveform unequal section, its underpart is waveform, the bottom of the top of 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 band shape element 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 combined 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 stake (15) and cushion cap, prestress concrete beam (11) is located on above-mentioned cushion cap, and cushion cap is arranged in stake (15).
Priority Applications (1)
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| CN102808414B (en) * | 2012-08-24 | 2014-09-10 | 天津市建筑科学研究院有限公司 | Bonded post-tensioned prestressed anchoring construction method for cast-in-place concrete structure |
| CN103074885B (en) * | 2013-01-05 | 2014-10-08 | 华南理工大学 | Method for foundation settlement control |
| CN104005396B (en) * | 2014-06-23 | 2015-12-02 | 湖南大学 | A kind of prestressing without bondn geo-grid with fracture resistance |
| CN106988507B (en) * | 2017-04-19 | 2018-12-04 | 中建七局安装工程有限公司 | A kind of shielding prestressing force method for constructing terrace inhibiting electromagnetic interference |
| CN110735513A (en) * | 2019-10-24 | 2020-01-31 | 安徽四建控股集团有限公司 | Construction method of prestressed terraces |
| CN114673041B (en) * | 2022-03-23 | 2023-09-05 | 中国铁建港航局集团有限公司 | Soft soil foundation embankment disease treatment construction method |
| CN114737594A (en) * | 2022-05-06 | 2022-07-12 | 江苏海洋大学 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
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