CN105442626A - Composite inclined column expansion foundation structure applied to power transmission line in permafrost region - Google Patents
Composite inclined column expansion foundation structure applied to power transmission line in permafrost region Download PDFInfo
- Publication number
- CN105442626A CN105442626A CN201510980351.8A CN201510980351A CN105442626A CN 105442626 A CN105442626 A CN 105442626A CN 201510980351 A CN201510980351 A CN 201510980351A CN 105442626 A CN105442626 A CN 105442626A
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- batter post
- permafrost
- coarse
- transmission line
- steel concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/35—Foundations formed in frozen ground, e.g. in permafrost soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Foundations (AREA)
Abstract
The invention discloses a composite inclined column expansion foundation structure applied to a power transmission line in a permafrost region. The composite inclined column expansion foundation structure comprises four reinforced concrete inclined columns which are arranged according to a gradient inclination angle of a tower and upper part structure, wherein the reinforced concrete inclined columns stretch to be below an upper limit of permafrost; a horizontal reinforced concrete bottom plate is laid at the bottom of each reinforced concrete inclined column; the body of each reinforced concrete inclined column is wrapped with a glass fibre reinforced plastic sleeve; a space among the four reinforced concrete inclined columns is filled with coarse-particle soil; the filling depth of the coarse-particle soil is from the upper limit of permafrost to a natural surface; and a rubble layer is laid on the coarse-particle soil. According to the invention, the artificial upper limit of permafrost is increased, a horizontal action force transferred to the foundation from an upper tower is reduced, the stability of a tower foundation and the bearing capacity of a ground foundation are enhanced, and the up-pull possibility of the tower foundation, and the freezing damages of a project are reduced.
Description
[technical field]
The present invention relates to a kind of batter post spread footing in Permafrost Area, particularly relate to a kind of compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity.
[background technology]
The Foundation selection of Permafrost Area transmission line of electricity is subject to the serious restriction of various condition, especially the restriction of environmental factor and geological conditions.Batter post spread footing is a kind of foundation pattern that can effectively reduce tower leg horizontal applied force, in common soil district, the shaft tower larger to basic role power, after adopting batter post spread footing, concrete and bar material amount approximately reduce by 10% ~ 20% than right cylinder spread footing.But in Frozen Ground Area, the frost-heave force that seasonally frozen layer produces makes batter post shaft bear extra lifting by frost and moment of flexure than right cylinder shaft, especially in the area that frost heave higher grade, batter post shaft easily produces frost-heaving deformation and destroys.In addition, in Permafrost Area, batter post spread footing construction and change when filling out, needs to be excavated to below Upper Limit of Permafrost, the thermal equilibrium state of disturbance permafrost, may cause basic thaw collapse, affect column foot and stablize and line security.
Basic engineering, construction and operation is carried out in Permafrost Area, reciprocal effect problem between too busy to get away ever-frozen ground and engineering is studied to column foot stability, therefore need there is following requirement to foundation soil body: 1. reduce the frost heave of the basic batter post part soil body, evade the effect of frost heave to base integral and component as far as possible; 2. utilizing works measure can prevent permafrost degradation, effectively improve and Quito year peripherally freeze the soil body upper limit, reduce engineering activity to the invasion of ever-frozen ground, utilize the bearing capacity that frozen soil is higher as much as possible; 3. reduce the horizontal loading that basis passed to by shaft tower as far as possible, design special Component composition form to tackle this imbalance.
Generally speaking, need to be optimized design to spread footing, and the supporting relevant engineering measure being easy to realize is combined into composite construction, and further optimal design and analysis are carried out to its combining structure, technical support can be provided to the control of the engineering problem such as frost heave, thaw collapse in Permafrost Area power line spread footing engineering.
[summary of the invention]
In view of above-mentioned, the object of the present invention is to provide a kind of efficient, easy compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity, its bearing capacity of foundation soil of effective raising, reduce the horizontal force that top shaft tower reaches basis, weaken the contact stress of swelling soil-basic contact surface, reduce the impact of basic slope component by lifting by frost, realize the effective lifting to Upper Limit of Permafrost, meanwhile, the engineering problem caused for prevention and control body frost heaving and thaw collapse provides technical support.
For achieving the above object, the technical solution used in the present invention is:
A kind of compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity, comprise four the steel concrete batter posts arranged according to shaft tower and superstructure gradient angle of inclination, steel concrete batter post extend into below Upper Limit of Permafrost, horizontal steel bar concrete floor is equipped with bottom steel concrete batter post, steel concrete batter post shaft is enclosed with glass fiber reinforced plastic sleeve, coarse-grained soil is had at four steel concrete batter post central filler, coarse-grained soil depth of cracking closure be from Upper Limit of Permafrost to natural surface, coarse-grained soil is equipped with ragstone layer.
Further, between coarse-grained soil and ragstone layer, composite geo-membrane is equipped with.
Further, described horizontal steel bar concrete bottom board size is greater than steel concrete batter post horizontal cross section dimension, expands base plate as batter post spread footing.
Further, fiber glass reinforced plastic cover cylinder size is slightly larger than steel concrete batter post shaft, and glass fiber reinforced plastic sleeve has lubriation material with the gap filling between steel concrete batter post.
Further, described ragstone layer scope of laying is greater than coarse-grained soil laying scope.
Further, described composite geo-membrane scope of laying is greater than coarse-grained soil and ragstone layer laying scope.
The present invention can realize the effective temperature-reducing to Permafrost Area power line column foot, improve the anthropogenic heating of ever-frozen ground, reduce the horizontal applied force that top shaft tower reaches basis, strengthen stability and the bearing capacity of foundation soil of column foot, reduce and column foot pulls out possibility and earth's surface seepage flow to the invasion of permafrost.
Advantage of the present invention is:
1. steel concrete batter post shaft is enclosed with glass fiber reinforced plastic sleeve, glass fiber reinforced plastic sleeve, with the comparatively smooth feature of the contact surface of the soil body, can to reduce in frozen-thaw process by environmental temperature fluctuation the direct lifting by frost power on basis.
2. four steel concrete batter post central filler have coarse-grained soil, utilize the frost heaving that coarse granule filler can effectively reduce the soil body and the lifting by frost effect brought thereof.
3. coarse-grained soil being equipped with ragstone layer, by arranging one deck ragstone layer on earth's surface, the buried depth of Upper Limit of Permafrost can being improved, ensure foundation soil body frozen state, improve foundation bearing capacity.
4. adopt compound batter post spread footing system, batter post, base plate can prefabricated also can be cast-in-place, under the prerequisite ensureing engineering goal-selling, construction costs can be saved, reduce difficulty of construction.
Further, at the composite geo-membrane that ragstone layer and coarse-grained soil interface are laid, the invasion of surface flow to permafrost can effectively be reduced.
[accompanying drawing explanation]
Fig. 1 is the cross-sectional structure schematic diagram of compound batter post spread footing structure of the present invention;
Fig. 2 is the earth's surface schematic top plan view of compound batter post spread footing structure of the present invention;
In figure: 1. shaft tower and superstructure; 2. ragstone layer; 3. coarse-grained soil; 4. steel concrete batter post; 5. glass fiber reinforced plastic sleeve; 6. horizontal steel bar concrete floor; 7. composite geo-membrane; 8. natural surface; 9. Upper Limit of Permafrost; 10. shaft tower central projection.
[detailed description of the invention]
Below by reference to the accompanying drawings with the present invention is described in further detail, but not as foundation the present invention being done to any restriction.
As depicted in figs. 1 and 2, the present invention is applied to the compound batter post spread footing structure of Permafrost Area transmission line of electricity, comprise four the steel concrete batter posts 4 arranged according to shaft tower and superstructure 1 gradient angle of inclination, the diagonal position of intersecting point of shaft tower central projection 10 4 steel concrete batter posts 4, be positioned at steel concrete batter post 4 and extend into Upper Limit of Permafrost less than 9, horizontal steel bar concrete floor 6 is equipped with bottom steel concrete batter post 4, steel concrete batter post 4 shaft is enclosed with glass fiber reinforced plastic sleeve 5, coarse-grained soil 3 is had at four steel concrete batter post 4 central filler, coarse-grained soil 3 depth of cracking closure is to natural surface 8 from Upper Limit of Permafrost, coarse-grained soil 3 is equipped with ragstone layer 2.
A steel concrete batter post according to shaft tower tower leg gradient inclination angle-adjustable and horizontal steel bar concrete floor, object is to reduce top shaft tower to the horizontal force on basis, a glass fiber reinforced plastic sleeve is wrapped up at batter post shaft, object is to weaken the friction of batter post with surrounding soil, weakens the basic displacement because lifting by frost and thaw collapse cause.And this structure division component can be prefabricated in advance, assembles at the scene during construction, be applicable to the construction of excavating spread footing.
Further, be equipped with composite geo-membrane 7 between coarse-grained soil 3 and ragstone layer 2, composite geo-membrane 7 scope of laying is greater than coarse-grained soil 3 and ragstone layer 2 lays scope.For guaranteeing that surface flow to the harassment of ever-frozen ground, on the boundary layer of filling with coarse-grained soil bottom ragstone layer, can not be laid one deck composite geo-membrane and invade in ground to prevent surface flow.
Further, described horizontal steel bar concrete floor 6 size is greater than steel concrete batter post 4 horizontal cross section dimension, expand base plate as batter post spread footing, and the expansion base plate on basis is set into below Upper Limit of Permafrost, with the bearing capacity of foundation soil utilizing ever-frozen ground stratum higher.
Further, glass fiber reinforced plastic sleeve 5 size is slightly larger than steel concrete batter post 4 shaft, and glass fiber reinforced plastic sleeve 5 has lubriation material with the gap filling between steel concrete batter post 4.
Further, described ragstone layer 2 scope of laying is greater than coarse-grained soil 3 and lays scope.The effective temperature-reducing to the Permafrost Area power line column foot soil body can be realized, ragstone layer can accelerate the interchange of heat of air with ever-frozen ground, improve the anthropogenic heating of ever-frozen ground, strengthen stability and the bearing capacity of foundation soil of pole and tower foundation, reduce on basis and pull out possibility and engineering freeze injury.
Principle of the present invention is, in Permafrost Area, when the horizontal applied force that the top shaft tower adopting right cylinder spread footing to bear transmits is larger, the designing material amount of concrete and reinforcing bar is larger, and adopting conventional batter post spread footing, seasonally frozen layer can produce extra frost heave action to batter post component.Therefore according to the feature of permanent frozen soil foundation, the batter post spread footing that design is suitable for, reduces seasonal frozen ground layer lifting by frost effect and reduces the impact of surface flow on ever-frozen ground simultaneously.According to the gradient of the main material of shaft tower, basic role power and geological conditions, the batter post spread footing of differing tilt angles and the degree of depth is set, and the expansion base plate on basis is set into below Upper Limit of Permafrost, with the bearing capacity of foundation soil utilizing ever-frozen ground stratum higher.In the depth bounds of seasonally frozen layer, a glass fiber reinforced plastic sleeve is set at batter post shaft, to by glass fiber reinforced plastic interface with the less mechanism of soil layer contact friction, weaken due to soil layer frost heave the lifting by frost impact that basis produces.At inclined column foundation in angular direction, changing in certain level angle and fill out the less coarse-grained soil filler of frozen-heave factor, to reducing shaft surrounding soil, the frost heave of batter post being affected.Above earth's surface, lay certain thickness ragstone layer simultaneously, to utilize the active cooling mechanism of ragstone layer to ensure the stability of its ever-frozen ground that underlies, improve bearing capacity of foundation soil and stability further.
The above; be only the present invention's preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (6)
1. one kind is applied to the compound batter post spread footing structure of Permafrost Area transmission line of electricity, it is characterized in that: comprise four the steel concrete batter posts (4) arranged according to shaft tower and superstructure (1) gradient angle of inclination, steel concrete batter post (4) extend into Upper Limit of Permafrost (9) below, steel concrete batter post (4) bottom is equipped with horizontal steel bar concrete floor (6), steel concrete batter post (4) shaft is enclosed with glass fiber reinforced plastic sleeve (5), coarse-grained soil (3) is had at four steel concrete batter post (4) central filler, coarse-grained soil (3) depth of cracking closure is to natural surface (8) from Upper Limit of Permafrost, coarse-grained soil (3) is equipped with ragstone layer (2).
2. the compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity according to claim 1, is characterized in that: between coarse-grained soil (3) and ragstone layer (2), be equipped with composite geo-membrane (7).
3. the compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity according to claim 1, it is characterized in that: described horizontal steel bar concrete floor (6) size is greater than steel concrete batter post (4) horizontal cross section dimension, expand base plate as batter post spread footing.
4. the compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity according to claim 1, it is characterized in that: glass fiber reinforced plastic sleeve (5) size is slightly larger than steel concrete batter post (4) shaft, and glass fiber reinforced plastic sleeve (5) has lubriation material with the gap filling between steel concrete batter post (4).
5. the compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity according to any one of claim 1-4, is characterized in that: described ragstone layer (2) laying scope is greater than coarse-grained soil (3) and lays scope.
6. the compound batter post spread footing structure being applied to Permafrost Area transmission line of electricity according to any one of claim 1-4, is characterized in that: described composite geo-membrane (7) laying scope is greater than coarse-grained soil (3) and ragstone layer (2) lays scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980351.8A CN105442626B (en) | 2015-12-23 | 2015-12-23 | It is applied to the compound batter post spread foundation structure of Permafrost Area transmission line of electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980351.8A CN105442626B (en) | 2015-12-23 | 2015-12-23 | It is applied to the compound batter post spread foundation structure of Permafrost Area transmission line of electricity |
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| Publication Number | Publication Date |
|---|---|
| CN105442626A true CN105442626A (en) | 2016-03-30 |
| CN105442626B CN105442626B (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510980351.8A Active CN105442626B (en) | 2015-12-23 | 2015-12-23 | It is applied to the compound batter post spread foundation structure of Permafrost Area transmission line of electricity |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109057497A (en) * | 2018-08-22 | 2018-12-21 | 国网内蒙古东部电力有限公司经济技术研究院 | A kind of anti-freeze expansion shaft tower |
| CN109235481A (en) * | 2018-10-22 | 2019-01-18 | 青海省地质环境监测总站 | A kind of construction method preventing lifting by frost for transmission line of electricity column foundation |
| CN111535106A (en) * | 2020-05-14 | 2020-08-14 | 哈尔滨工业大学 | Method for reducing melting, sedimentation and deformation of permafrost region highway during operation |
| CN111877408A (en) * | 2020-06-05 | 2020-11-03 | 国网内蒙古东部电力有限公司建设分公司 | Shallow foundation surface layer snow accumulation prevention infiltration and heat preservation system for overhead transmission line in cold region |
| CN113417313A (en) * | 2021-07-20 | 2021-09-21 | 四川电力设计咨询有限责任公司 | Section steel support shroud plate assembled foundation for frozen soil area |
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| CN201865117U (en) * | 2010-11-23 | 2011-06-15 | 江苏省电力公司句容市供电公司 | Line terminal tower foundation with cable protecting pipe |
| CN103452128A (en) * | 2013-08-06 | 2013-12-18 | 安徽华电工程咨询设计有限公司 | Method for lifting base plane of power transmission line tower by adopting steel pipe connecting leg |
| CN204098056U (en) * | 2014-09-24 | 2015-01-14 | 国家电网公司 | Colliery minery UHV transmission steel tower agent on crack resistance of concrete distortion found |
| CN205224071U (en) * | 2015-12-23 | 2016-05-11 | 中国电力工程顾问集团西北电力设计院有限公司 | Be applied to ever -frozen ground area transmission line's compound batter post extension foundation structure |
| JPWO2014014033A1 (en) * | 2012-07-20 | 2016-07-07 | 伊藤組土建株式会社 | Pile foundation and pile foundation installation method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201865117U (en) * | 2010-11-23 | 2011-06-15 | 江苏省电力公司句容市供电公司 | Line terminal tower foundation with cable protecting pipe |
| JPWO2014014033A1 (en) * | 2012-07-20 | 2016-07-07 | 伊藤組土建株式会社 | Pile foundation and pile foundation installation method |
| CN103452128A (en) * | 2013-08-06 | 2013-12-18 | 安徽华电工程咨询设计有限公司 | Method for lifting base plane of power transmission line tower by adopting steel pipe connecting leg |
| CN204098056U (en) * | 2014-09-24 | 2015-01-14 | 国家电网公司 | Colliery minery UHV transmission steel tower agent on crack resistance of concrete distortion found |
| CN205224071U (en) * | 2015-12-23 | 2016-05-11 | 中国电力工程顾问集团西北电力设计院有限公司 | Be applied to ever -frozen ground area transmission line's compound batter post extension foundation structure |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109057497A (en) * | 2018-08-22 | 2018-12-21 | 国网内蒙古东部电力有限公司经济技术研究院 | A kind of anti-freeze expansion shaft tower |
| CN109057497B (en) * | 2018-08-22 | 2019-07-26 | 国网内蒙古东部电力有限公司经济技术研究院 | A kind of anti-freeze expansion shaft tower |
| CN109235481A (en) * | 2018-10-22 | 2019-01-18 | 青海省地质环境监测总站 | A kind of construction method preventing lifting by frost for transmission line of electricity column foundation |
| CN111535106A (en) * | 2020-05-14 | 2020-08-14 | 哈尔滨工业大学 | Method for reducing melting, sedimentation and deformation of permafrost region highway during operation |
| CN111535106B (en) * | 2020-05-14 | 2021-12-10 | 哈尔滨工业大学 | Method for reducing melting, sedimentation and deformation of permafrost region highway during operation |
| CN111877408A (en) * | 2020-06-05 | 2020-11-03 | 国网内蒙古东部电力有限公司建设分公司 | Shallow foundation surface layer snow accumulation prevention infiltration and heat preservation system for overhead transmission line in cold region |
| CN113417313A (en) * | 2021-07-20 | 2021-09-21 | 四川电力设计咨询有限责任公司 | Section steel support shroud plate assembled foundation for frozen soil area |
| CN113417313B (en) * | 2021-07-20 | 2023-02-03 | 四川电力设计咨询有限责任公司 | Section steel support shroud plate assembled foundation for frozen soil area |
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| CN105442626B (en) | 2017-05-31 |
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