CN103225267A - Construction method of deep and thick soft soil foundation bed bridge abutment - Google Patents
Construction method of deep and thick soft soil foundation bed bridge abutment Download PDFInfo
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- CN103225267A CN103225267A CN2013101081340A CN201310108134A CN103225267A CN 103225267 A CN103225267 A CN 103225267A CN 2013101081340 A CN2013101081340 A CN 2013101081340A CN 201310108134 A CN201310108134 A CN 201310108134A CN 103225267 A CN103225267 A CN 103225267A
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Abstract
The invention discloses a construction method of a deep and thick soft soil foundation bed bridge abutment. The method comprises steps as follows: 1) forming a bridge abutment land construction area; 2) performing primary soft foundation treatment-vacuum water covering and pre-pressing treatment on the bridge abutment land construction area; 3) performing bridge abutment pile foundation construction and bearing platform construction; 4) performing secondary soft foundation treatment-composite foundation treatment on the bridge abutment land construction area; 5) backfilling the area behind the bridge abutment with a filler; and 6) completing the construction of a bridge abutment concrete structure. According to the construction method, due to the secondary soft foundation treatment, post-construction settlement of a road behind the bridge abutment and settlement differences between the road and a bridge abutment structure are reduced, and the phenomenon that a vehicle bumps at a bridge head can be prevented. The construction method of the deep and thick soft soil foundation bed bridge abutment is simple, convenient and feasible, high in efficiency, safe and reliable, and can control the project quality conveniently and save labor power, material resources and financial resources. The construction method is applicable to an area with a low foundation bearing capacity.
Description
Technical field
The present invention relates to a kind of abutment job practices, particularly a kind of deep soft soil foundation abutment job practices.
Background technology
Weak soil has great harmfulness to ground, if do not handle or deal with improperly, will cause foundation instability, makes the excessive or differential settlement of structure sedimentation, and structure is caused destruction in various degree even thoroughly scraps.The precompressed of banketing earlier at the abutment place, the ratio design elevation of in advance soil being filled out when building embankment is higher, and widen the width that bankets, and sink to quicken ground consolidation, excavate the extra-fill part later on again, the method of this precompressed or surcharge preloading, simple, but need very long consolidation time, bridge slope connecting section road can produce bigger settlement after construction, produce tangible settlement difference with the abutment structure, the phenomenon that produces " bumping at bridge-head " is very general.
Summary of the invention
The present invention provides a kind of deep soft soil foundation abutment job practices of being convenient to the Control Engineering quality for solving the technical problem that exists in the known technology.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: a kind of deep soft soil foundation abutment job practices may further comprise the steps:
One) form land-based area after the hydraulic fill sand of waters, hydraulic fill sand end face absolute altitude is greater than water surface absolute altitude, forms abutment land-based area works area, and abutment land-based area works area comprises the scope of abutment foundation region and preceding 10m at least thereof and the scope of 50m at least thereafter;
Two) treatment of soft foundation-vacuum water covering prepressing being carried out in abutment land-based area works area handles;
Three) abutment pile foundation construction and bearing platform construction;
Four) secondary treatment of soft foundation-composite foundation being carried out in abutment land-based area works area handles;
In the scope of abutment foundation region and preceding 10m at least thereof many cement mixing piles are set and carry out ground stabilization, behind the abutment foundation region, many PHC pile tubes are set in the vacuum water covering prepressing district in the 50m scope at least and carry out ground stabilization;
Five) at the back filling behind abutment filler;
Six) finish the construction of abutment concrete structure.
All described cement mixing piles form cancelled structure.
Described filler is light-weight foamed soil.
Described PHC pile tube is big more from the near more buried depth of abutment.
Advantage and good effect that the present invention has are: vacuum preloading is handled for the first time, can improve the bearing capacity of soft foundation, and the degree of consolidation of the soil body increases, and moisture content reduces; Composite foundation is handled for the second time, utilizes the rigid pile pile body stiffness big, and the stake long hair is waved the side friction of stake entirely, gives dark soil layer with Load Transfer; By the secondary treatment of soft foundation, reduced the settlement after construction of road behind the abutment, reduced the settlement difference of road and abutment structure, can effectively avoid the appearance of " bumping at bridge-head " phenomenon; 50m adopts light-weight foamed native filler backfill behind the platform, can alleviate the pressure to abutment, helps the stable of abutment; The present invention is simple and easy to do, efficient is high, be convenient to Control Engineering quality, safe and reliable, can save human and material resources and financial resources.Be applicable to the area that bearing capacity of foundation soil is low, can be in the construction of a lot of organizations in the localities.
Description of drawings
Fig. 1 is the plan view of the abutment land-based area works area of the present invention's formation;
Fig. 2 is the profile of Fig. 1;
Fig. 3 forms the plan view in vacuum water covering prepressing district for the present invention;
Fig. 4 is the profile of Fig. 3;
Fig. 5 carries out the plan view of second consolidation for the present invention;
Fig. 6 is the skiagraph of Fig. 5;
Fig. 7 is the plan view of the present invention at many cement mixing piles of the scope setting of abutment foundation region and preceding 10m at least thereof.
Among the figure: 1, hydraulic reclamation layer of sand; 2, mud; 3, the stone layer that cuts into a mountain; 4, sand pocket cofferdam; 5, gabion bulwark; 6, vacuum water covering prepressing district; 7, cast-in-place concrete pile; 7-1, cushion cap; 8, cement mixing pile; 9, PHC pile tube; 9-1, pile cover, 10, light-weight foamed soil.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1～Fig. 7, a kind of deep soft soil foundation abutment job practices may further comprise the steps:
One) form land-based area after the hydraulic fill sand of waters, hydraulic fill sand end face absolute altitude is greater than water surface absolute altitude, forms abutment land-based area works area, and abutment land-based area works area comprises the scope of abutment foundation region and preceding 10m at least thereof and the scope of 50m at least thereafter;
Near the abutment foundation region, original waters hydraulic fill sand is formed abutment land-based area works area, abutment land-based area works area is followed successively by mud 2 and hydraulic reclamation layer of sand 1 from bottom to up, hydraulic fill sand is middle fine sand, particle diameter surpasses 85% of gross mass greater than the particle of 0.075mm, particle diameter less than the content of 0.075mm clay less than 15%, adopt the layer and section hydraulic reclamation, sand pocket cofferdam 4 end face absolute altitude 3.00m, width 15m, at the cofferdam upstream face gabion bulwark 5 is set, prevent that tide from washing away sand pocket cofferdam 4, water surface absolute altitude 0.5～1.30m, the end face absolute altitude 1.70m of hydraulic reclamation layer of sand 1;
Two) treatment of soft foundation-vacuum water covering prepressing being carried out in abutment land-based area works area handles;
Plastic draining board vacuum water covering prepressing is carried out in abutment land-based area works area handle, make abutment land-based area works area become vacuum water covering prepressing district 6.The plastic draining board length of using is 30m, equilateral triangle layout, spacing 1m, and the pumpdown time is 3 months; Under the load of vacuum preloading load 80Kp, the degree of consolidation reaches 85%, stops to vacuumize;
Three) abutment pile foundation construction and bearing platform construction;
On the hydraulic reclamation layer of sand 1 of abutment foundation region, lay the stone layer 3 that cuts into a mountain, so that the Work machine operation.The end face absolute altitude 2.50m of stone layer 3 cuts into a mountain.The abutment pile foundation adopts cast-in-place concrete pile 7, and diameter is 1.5m;
Four) secondary treatment of soft foundation-composite foundation being carried out in abutment land-based area works area handles;
Scope at abutment foundation region and preceding 10m at least thereof is provided with many cement mixing piles 8, be used for ground stabilization, for improving consolidation effect, preferably make all cement mixing piles 8 form cancelled structure, cement mixing pile 8 is identical with the absolute altitude of abutment pile foundation, cement mixing pile diameter 700mm, overlap joint 200mm, length 20m, cement mixed ratio 18%, cement grade P.O42.5, water/binder ratio 0.45, gypsum mix and are 1% of cement consumption;
At least in the vacuum water covering prepressing district of 50m, set PHC-500-AB type, wall thickness 125mmPHC pile tube 9 behind the abutment foundation region, length is between 50～7m; The closer to abutment, the length of PHC pile tube 9 is big more.Pile cover 9-1 is of a size of 1.2m * 1.2m * 0.4m; Pile tube embeds 0.1m in the pile cover 9-1;
Five) adopt the light-weight foamed native filler backfill of lightweight, intensity height, good stability and environmental protection behind the abutment;
In being equipped with the vacuum water covering prepressing district of PHC pile tube 9, adopt light-weight foamed native filler 10 backfills of lightweight, intensity height, good stability and environmental protection.
Six) finish the construction of abutment concrete structure.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (4)
1. a deep soft soil foundation abutment job practices is characterized in that, may further comprise the steps:
One) form land-based area after the hydraulic fill sand of waters, hydraulic fill sand end face absolute altitude is greater than water surface absolute altitude, forms abutment land-based area works area, and abutment land-based area works area comprises the scope of abutment foundation region and preceding 10m at least thereof and the scope of 50m at least thereafter;
Two) treatment of soft foundation-vacuum water covering prepressing being carried out in abutment land-based area works area handles;
Three) abutment pile foundation construction and bearing platform construction;
Four) secondary treatment of soft foundation-composite foundation being carried out in abutment land-based area works area handles;
In the scope of abutment foundation region and preceding 10m at least thereof many cement mixing piles are set and carry out ground stabilization, behind the abutment foundation region, many PHC pile tubes are set in the vacuum water covering prepressing district in the 50m scope at least and carry out ground stabilization;
Five) at the back filling behind abutment filler;
Six) finish the construction of abutment concrete structure.
2. deep soft soil foundation abutment job practices according to claim 1 is characterized in that, all described cement mixing piles form cancelled structure.
3. deep soft soil foundation abutment job practices according to claim 1 is characterized in that described filler is light-weight foamed soil.
4. deep soft soil foundation abutment job practices according to claim 1 is characterized in that, described PHC pile tube is big more from the near more buried depth of abutment.
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Cited By (9)
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| CN103469701A (en) * | 2013-08-30 | 2013-12-25 | 浙江省建工集团有限责任公司 | Construction method for preparing foamed light soil in site in integrated form to fill substructure of high-speed rail |
| CN103557366A (en) * | 2013-11-15 | 2014-02-05 | 中交天航港湾建设工程有限公司 | Submarine pipeline protection device in shallow sea reclamation area |
| CN104674645A (en) * | 2015-02-02 | 2015-06-03 | 淮海工学院 | Integral plate type small bridge and culvert combination applicable to soft soil foundations |
| CN105000845A (en) * | 2015-06-29 | 2015-10-28 | 河南华泰建材开发有限公司 | Light foamed soil for abutment back backfilling and construction method |
| CN105016770A (en) * | 2015-07-09 | 2015-11-04 | 河南华泰建材开发有限公司 | Bridge span reduction method and special-purposed bridge span reduction backfill material |
| CN105672197A (en) * | 2016-03-23 | 2016-06-15 | 上海勘测设计研究院有限公司 | Method for heightening and reinforcing embankment and structure |
| CN108193642A (en) * | 2018-01-03 | 2018-06-22 | 杭州水利水电勘测设计院有限公司 | A kind of revetment reinforces facility and its construction method |
| CN111364453A (en) * | 2020-03-24 | 2020-07-03 | 中交一公局第七工程有限公司 | Method for reinforcing deep soft soil foundation by light cement soil long spiral cast-in-place pile |
| CN113123321A (en) * | 2019-12-31 | 2021-07-16 | 中国建筑第八工程局有限公司 | Method for synchronous construction of pile foundation and soft foundation treatment by adopting compound vacuum preloading and pile loading |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469701A (en) * | 2013-08-30 | 2013-12-25 | 浙江省建工集团有限责任公司 | Construction method for preparing foamed light soil in site in integrated form to fill substructure of high-speed rail |
| CN103469701B (en) * | 2013-08-30 | 2016-01-20 | 浙江省建工集团有限责任公司 | On-the-spot integrated form is prepared Foam lightweight soil and is filled high ferro roadbed construction method |
| CN103557366B (en) * | 2013-11-15 | 2015-11-25 | 中交天航港湾建设工程有限公司 | A kind of submarine pipeline protection device in shallow sea reclamation area |
| CN103557366A (en) * | 2013-11-15 | 2014-02-05 | 中交天航港湾建设工程有限公司 | Submarine pipeline protection device in shallow sea reclamation area |
| CN104674645A (en) * | 2015-02-02 | 2015-06-03 | 淮海工学院 | Integral plate type small bridge and culvert combination applicable to soft soil foundations |
| CN105000845A (en) * | 2015-06-29 | 2015-10-28 | 河南华泰建材开发有限公司 | Light foamed soil for abutment back backfilling and construction method |
| CN105016770A (en) * | 2015-07-09 | 2015-11-04 | 河南华泰建材开发有限公司 | Bridge span reduction method and special-purposed bridge span reduction backfill material |
| CN105672197A (en) * | 2016-03-23 | 2016-06-15 | 上海勘测设计研究院有限公司 | Method for heightening and reinforcing embankment and structure |
| CN105672197B (en) * | 2016-03-23 | 2017-11-10 | 上海勘测设计研究院有限公司 | The method and structure of heightening and consolidation embankment |
| CN108193642A (en) * | 2018-01-03 | 2018-06-22 | 杭州水利水电勘测设计院有限公司 | A kind of revetment reinforces facility and its construction method |
| CN108193642B (en) * | 2018-01-03 | 2020-08-25 | 杭州水利水电勘测设计院有限公司 | Revetment reinforcing facility and construction method thereof |
| CN113123321A (en) * | 2019-12-31 | 2021-07-16 | 中国建筑第八工程局有限公司 | Method for synchronous construction of pile foundation and soft foundation treatment by adopting compound vacuum preloading and pile loading |
| CN113123321B (en) * | 2019-12-31 | 2022-11-25 | 中国建筑第八工程局有限公司 | Synchronous construction method for treating soft foundation by adopting compound vacuum preloading and surcharge loading |
| CN111364453A (en) * | 2020-03-24 | 2020-07-03 | 中交一公局第七工程有限公司 | Method for reinforcing deep soft soil foundation by light cement soil long spiral cast-in-place pile |
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| CN103225267B (en) | 2015-07-15 |
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Address after: 300301 Dongli District, flawless Street Jintang Highway Bridge No. ten Patentee after: MCC TIANGONG GROUP TIANJIN CO., LTD. Address before: 300301 Dongli District, Tianjin street, Tianjin street, the twenty smelting Patentee before: Tianjin MCC20 Construction Co., Ltd. |