CN104532869B - Method used for improving anti-pulling performance of power transmission line tower foundation in drift sand region - Google Patents
Method used for improving anti-pulling performance of power transmission line tower foundation in drift sand region Download PDFInfo
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- CN104532869B CN104532869B CN201410743635.0A CN201410743635A CN104532869B CN 104532869 B CN104532869 B CN 104532869B CN 201410743635 A CN201410743635 A CN 201410743635A CN 104532869 B CN104532869 B CN 104532869B
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- 239000004576 sand Substances 0.000 title claims abstract description 60
- 230000005540 biological transmission Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 14
- 230000004888 barrier function Effects 0.000 claims abstract description 11
- 239000010902 straw Substances 0.000 claims abstract description 9
- 239000011435 rock Substances 0.000 claims description 24
- 238000000605 extraction Methods 0.000 claims description 13
- 239000010410 layer Substances 0.000 claims description 11
- 210000003205 muscle Anatomy 0.000 claims description 10
- 239000011398 Portland cement Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 206010000234 Abortion spontaneous Diseases 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 208000015994 miscarriage Diseases 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 208000000995 spontaneous abortion Diseases 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- 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)
- Foundations (AREA)
Abstract
The invention discloses a method used for improving anti-pulling performance of a power transmission line tower foundation in a drift sand region. The method includes the steps of foundation pit excavating, installing the assembly type foundation, string cement with wind-blown sand, laying a straw checkerboard sand barrier or paving gravels, wherein the weight ratio of common silicate cement and drift sand is defined to be 0.03:1, the anti-pulling bearing capability of the power transmission line foundation is remarkably improved, and the wind and sand resistance of the desert region is improved. The cement content is less, meanwhile transportation amount is small for the power transmission line tower foundation distributed in spots, the cost for wind and sand resistance is greatly reduced, and remarkable economical benefit is obtained.
Description
Technical field
The present invention relates to the foundation engineering technology of a kind of transmission line of electricity, be specifically related to a kind of for improving the transmission of electricity of drift-sand area
The method of overhead line structures foundation anti-pulling performance.
Background technology
Drift-sand is a kind of sandy soil with special nature, and its notable engineering characteristic is: granule is uniform, natural moisture content
Low (3%～about 10%), chance water have " settlement by soaking ".
Sand Movement is serious to industry harm such as highway, railway, transmission lines of electricity, current drift-sand area electric power line pole tower
Basis generally two kinds of modes of checking winds and fixing drifting sand of employing:
1) straw checkerboard barrier sand-protecting barrier fixes the sand: this kind of sand-fixation method generally takes the straw about length 50cm, imbeds 20-30cm in sand,
Expose outside Shamian Island 20-30cm, surround the grid of about 1m × 1m, be covered with basis, whole tower position extension with this kind of grid
2-3m.This mode of fixing the sand has a disadvantage in that owing to the things such as straw are easily degenerated, and generally at circuit running, needs
Safeguarding in time when patrolling and examining, maintenance period is usually 1-2；If safeguarding the most in time, owing to straw checkerboard barrier sand-protecting barrier fixes the sand mode
Single, cause engineering safety hidden danger；Basic stand column and sandy soil contact site, earth's surface easily because of the raw wind erosion of local wind's miscarriage, are led
Cause is appeared and is highly increased, and hides some dangers for engineering；
2) rubble paving presses solidly sand: this kind fixes the sand mode generally at the metalling that Shamian Island bedding 20cm is thick, and metalling is covered with whole
Individual tower position, basis extension 2-3m.This kind of mode can be prevented effectively from the wind erosion at basic stand column position.But due in desert,
Generally engineering materials obtain and manually transport to construction ground, and simple employing rubble paving presses solidly sand, and the rubble amount used is big, increases
Freight volume, improves the expense of fixing the sand.
The above-mentioned measure of checking winds and fixing drifting sand belongs to mechanical sand fixation mode, needs to utilize substantial amounts of raw material (straw or rubble),
This is for the transmission line tower foundation of some wire distribution, desert area raw material freight volume greatly, costly, and on
State the mode of checking winds and fixing drifting sand itself and there is limitation.
Accordingly, it is desirable to provide a kind of sand-fixation method overcomes disadvantages described above so that the overall adhesive aggregation characteristic of drift-sand is carried
Height, thus can reach technical measures and the method improving transmission line tower foundation extraction-resistant behavior.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of for improving drift-sand area transmission line tower foundation resistance to plucking
The method of performance, described method comprises the steps:
A, in ground excavate upper shed 9m*9m, deep 3m, 45 ° of extended corners, holes of end 3m*3m；
B, installation foundation: after the sandstone that paving 100mm is thick, lay basis；
C, drift-sand mix cement layer: in the drift-sand of drift-sand Yu the ratio of Portland cement weight ratio 100:3
The drift-sand of the batch mixing that mixes cement backfill 300～500mm mixes cement after layer and gives compacting；
After d, backfill foundation ditch to top layer, lay straw checkerboard barrier sand-protecting barrier or gravel paving pressure.
Preferably, described basis is transmission line tower foundation, comprising: arrange from top to bottom on same vertical direction
Digging foundation and rock build-in basis；Described digging foundation and rock build-in basis and which is provided with the reinforcing bar of foundation bolt
Cylinder mould build-in global formation.
Preferably, described digging foundation is made up of the basic chassis of cylindrical basis principal post and truncated cone-shaped；Described basis principal post
Surface layer is exposed on top, and bottom, chassis, basis couples the rock build-in basis of circular platform type.
Preferably, described foundation bolt from top to bottom through digging foundation and rock build-in basis and rebar cylinder mould inside.
Preferably, the length of described foundation bolt is more than the height sum of digging foundation with rock build-in basis, foundation bolt
Top is provided with packing ring, locking nut and concrete enclosing cap, and bottom is provided with crotch or is welded with anchor slab.
Preferably, described rebar cylinder mould is by the main muscle of vertical direction, horizontal direction outer ring stirrup and horizontal direction inner ring stirrup
Constitute.
Preferably, rebar cylinder mould is the outer ring stirrup of the main ribs by vertical direction and horizontal direction and inner ring stirrup is constituted
Cylinder；Main ribs is uniformly arranged between one outer ring stirrup and inner ring stirrup, and described muscle is welded to connect.
With immediate prior art ratio, the invention have the benefit that
The method for improving drift-sand area transmission line tower foundation extraction-resistant behavior that the present invention provides is by by common
The weight ratio of portland cement and drift-sand is set to 0.03:1, the breakout capacity anti-than common tower foundation improve 10～
15%, extend 8～12% service life, desert area can be reached again and check winds and fix drifting sand effect, and cement consumption is little,
Transmission line tower foundation freight volume simultaneously for spot distribution is the least, greatly reduces the cost checked winds and fixed drifting sand, and obtains
Significant economic benefit.
Accompanying drawing explanation
Fig. 1 is that the present invention improves electric power line pole tower base in the method for drift-sand area transmission line tower foundation extraction-resistant behavior
The front view of plinth；
Fig. 2 is A-A sectional view in Fig. 1；
Fig. 3 is B-B sectional view in Fig. 1；
Fig. 4 is the rebar cylinder mould structural representation of transmission line tower foundation in Fig. 1；
Description of reference numerals: 1 digging foundation, 1-1 basis principal post, chassis, 1-2 basis, 2 rock build-in bases, 3 ground
Foot bolt, 3-1 crotch, 4 rebar cylinder moulds, the main muscle of 4-1,4-2 outer ring stirrup, 4-3 inner ring stirrup, 5 coagulation graves
Close cap
Detailed description of the invention
Below the detailed description of the invention of the present invention is described in further detail.
In order to thoroughly understand the embodiment of the present invention, detailed structure will be proposed in following description.Obviously, the present invention is real
The execution executing example is not limited to the specific details that those skilled in the art is familiar with.Presently preferred embodiments of the present invention is detailed
It is described as follows, but in addition to these describe in detail, the present invention can also have other embodiments.
In the present invention, transmission line tower foundation selects to see shown in Fig. 1, Fig. 2 and Fig. 3, and the embodiment of the present invention provides
A kind of base structure of electric power line pole tower, this basis at least includes: digging foundation 1, rock build-in basis 2,
Foot bolt 3, rebar cylinder mould 4, concrete protective cap 5 etc.；Cover by argillic horizon on earth's surface, under cover for severely-weathered or in
Deng the base structure using digging foundation 1 and rock build-in basis 2 to combine under the geological conditions of weathered rock formation, it is achieved
The transmission line tower foundation such as this kind of area higher enforcement supertension of extraction-resistant behavior, extra-high voltage.
Specifically, as preferably, described digging foundation 1 and rock build-in basis 2 are by foundation bolt 3 and rebar cylinder mould
4 build-ins are solidifying to be integrated, and uses concrete one-time-concreting entirety build-in molding, and wherein, digging foundation 1 is positioned at earth's surface and glues
Soil layer, rock build-in basis 2 is positioned at severely-weathered or medium weathering rock stratum；Described digging foundation 1 by basis principal post 1-1 and
Basis chassis 1-2 is constituted, and wherein, basis principal post 1-1 is cylinder, and basis chassis 1-2 is circular platform type, described basis
The top of principal post 1-1 is exposed surface clay layer and is covered, and bottom couples the basic chassis 1-2 of circular platform type, basis chassis 1-2
Bottom couple circular platform type rock build-in basis 2.
Specifically, as preferably, the top of described basis principal post 1-1 is inserted with many foundation bolts 3, preferably four,
The specification of the value range base area foot bolt 3 that each foundation bolt 3 exposes basis principal post 1-1 is different and changes, its thing
Matter scope is 200-400mm；Foundation bolt 3 top is provided with packing ring and locking nut, uses concrete after having assembled
Pour one concrete enclosing cap 5 of molding, in order to protecting field foot bolt 3 and securing member；The length of described foundation bolt 3
More than the height sum of digging foundation 1 with rock build-in basis 2, foundation bolt 3 is from top to bottom through digging foundation 1
Internal with rock build-in basis 2 and rebar cylinder mould 4, foundation bolt 3 bottom is provided with crotch 3-1 or is welded with anchor slab,
To strengthen anchoring effect.
Referring also to shown in Fig. 4, specifically, described rebar cylinder mould 4 is by some main muscle 4-1, several outer ring stirrups
4-2 and several inner rings stirrup 4-3 is constituted；Described each main muscle 4-1 is longitudinally disposed along Y-axis, described outside each
Circle stirrup 4-2 and each inner ring stirrup 4-3 is along X-axis horizontally set；Some main muscle 4-1 are circumferentially uniformly distributed,
Several outer rings stirrup 4-2 and several inner rings stirrup 4-3 is along Y-axis longitudinal arrangement；Described the most equally distributed often
A piece main muscle 4-1 is uniformly arranged between each outer ring stirrup 4-2 and each inner ring stirrup 4-3, described outside each
Circle stirrup 4-2 and each inner ring stirrup 4-3 is the most arranged vertically along each main muscle 4-1, and interval is uniform, with each main muscle
4-1 contact point is pad, and is welded to each other together, thus constitutes the rebar cylinder mould 4 that cylinder is netted；Described bar-mat reinforcement
The height of cage 4 is more than the height of digging foundation 1, and rebar cylinder mould 4 is from top to bottom through in digging foundation 1 and extend to
Rock build-in basis 2 is internal, be mounted in digging foundation 1 and rock build-in basis 2 by concreting together with, institute
Stating the design height scope inserted in rock build-in basis 2 bottom rebar cylinder mould 4 is 600-1300mm, embedded depth of foundation 3m.
In order to improve drift-sand area transmission line tower foundation extraction-resistant behavior, mainly it is implemented with following steps:
(1) excavation of foundation pit: using and mechanically or manually excavate, top is excavated according to 45 degree of extended corners, top excavation size
9m*9m, bottom excavation size 3m*3m, cutting depth 3m, foundation ditch sandy soil excavated volume 117 side, drift-sand weight about 163.8
Ton；
(2) assembling type base is installed: require 100mm sand-gravel cushion according to design, lays assembling type base and successively will
Each connector is tightened；
(3) drift-sand mixes cement: according to 3% incorporation Portland cement of drift-sand weight, press in whipping process
Weight according to bagged cement adds sand, is at once backfilled in foundation ditch after stirring, and enters according to 300～500mm mono-layers
Row compacting, amounts to required incorporation Portland cement amount 4914kg.
(4) after foundation ditch is backfilled to top layer, laying straw checkerboard barrier sand-protecting barrier or gravel paving pressure, foundation construction is complete.
Transmission line tower foundation extraction-resistant behavior in above-described embodiment, pulls out in the assembling type base limit under normal conditions and holds
Load power is 500kN, and the assembling type base upper and low approximations in mixing cement mixing molding drift-sand ground is 600kN,
Its limit upper and low approximations improves about 20%.
According to correlational study achievement, the moisture content of drift-sand is typically about 3%, and Portland cement volume is 3%～6%
Time, the adhesive aggregation performance of drift-sand reaches optimal, and its Shear Strength Index C value improves more than 20%, and top layer is easily formed tool
Having the flexible bonding course of some strength, form protective layer on surface, sand dune, isolation air-flow directly acts on loose sand bed,
Ensure that the moisture of drift-sand is difficult to lose, adhesive aggregation performance is strengthened, reach to check winds and fix drifting sand and improve pole and tower foundation resistance to plucking and hold
Carry the effect that can manage it.
The present invention for improving the method for drift-sand area transmission line tower foundation extraction-resistant behavior by by common silicic acid
Salt cement is set to 0.03:1 with the weight ratio of drift-sand, and the resistance to plucking carrying significantly improving transmission line tower foundation can be manageed it,
Desert area can be reached again check winds and fix drifting sand effect, and cement consumption is little, simultaneously for the transmission line of electricity bar of spot distribution
Tower foundation freight volume is the least, greatly reduces the cost checked winds and fixed drifting sand, and achieves significant economic benefit
Finally should be noted that: above example only in order to illustrate that technical scheme is not intended to limit, although
Being described in detail the present invention with reference to above-described embodiment, those of ordinary skill in the field still can be to this
Bright detailed description of the invention is modified or equivalent, these without departing from spirit and scope of the invention any amendment or
Person's equivalent, all within the claims that application is awaited the reply.
Claims (5)
1. the method being used for improving drift-sand area transmission line tower foundation extraction-resistant behavior, it is characterised in that institute
The method of stating comprises the steps:
A, in ground excavate upper shed 9m*9m, deep 3m, 45 ° of extended corners, holes of end 3m*3m；
B, installation foundation: after the sandstone that paving 100mm is thick, lay basis；
C, drift-sand mix cement layer: in the drift-sand of drift-sand Yu the ratio of Portland cement weight ratio 100:3
The drift-sand of the batch mixing that mixes cement backfill 300～500mm mixes cement after layer and gives compacting；
After d, backfill foundation ditch to top layer, lay straw checkerboard barrier sand-protecting barrier or gravel paving pressure；
Described basis is transmission line tower foundation, comprising: the digging foundation arranged from top to bottom on same vertical direction
(1) and rock build-in basis (2)；Described digging foundation (1) and rock build-in basis (2) and described rock build-in basis (2)
It is provided with rebar cylinder mould (4) the build-in global formation of foundation bolt (3)；
Described digging foundation (1) is made up of the basic chassis (1-2) of cylindrical basis principal post (1-1) and truncated cone-shaped；Described foundation main
Surface layer is exposed on post (1-1) top, and chassis (1-2) bottom, basis couples rock build-in basis (2) of circular platform type.
Method for improving drift-sand area transmission line tower foundation extraction-resistant behavior the most according to claim 1,
It is characterized in that, described foundation bolt (3) is from top to bottom through digging foundation (1) and rock build-in basis (2) and bar-mat reinforcement
Cage (4) is internal.
Method for improving drift-sand area transmission line tower foundation extraction-resistant behavior the most according to claim 2,
It is characterized in that, the length of described foundation bolt (3) is more than the height sum of digging foundation (1) and rock build-in basis (2),
Foundation bolt (3) top is provided with packing ring, locking nut and concrete enclosing cap (5), and bottom is provided with crotch (3-1) or weldering
It is connected to anchor slab.
Method for improving drift-sand area transmission line tower foundation extraction-resistant behavior the most according to claim 1,
It is characterized in that, described rebar cylinder mould (4) is by the main muscle (4-1) of vertical direction, horizontal direction outer ring stirrup (4-2) and level side
Constitute to inner ring stirrup (4-3).
Method for improving drift-sand area transmission line tower foundation extraction-resistant behavior the most according to claim 4,
It is characterized in that, rebar cylinder mould (4) is the main ribs (4-1) by vertical direction and the outer ring stirrup (4-2) of horizontal direction and interior
The cylinder that circle stirrup (4-3) is constituted；Main ribs (4-1) is uniformly arranged on one outer ring stirrup (4-2) and inner ring stirrup
(4-3) between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410743635.0A CN104532869B (en) | 2014-12-08 | 2014-12-08 | Method used for improving anti-pulling performance of power transmission line tower foundation in drift sand region |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410743635.0A CN104532869B (en) | 2014-12-08 | 2014-12-08 | Method used for improving anti-pulling performance of power transmission line tower foundation in drift sand region |
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| Publication Number | Publication Date |
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| CN104532869A CN104532869A (en) | 2015-04-22 |
| CN104532869B true CN104532869B (en) | 2017-01-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898543A (en) * | 2019-03-25 | 2019-06-18 | 东北大学 | A kind of pulling-resistant and pressure-resistant power transmission tower basis and its construction method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498973A (en) * | 2016-12-27 | 2017-03-15 | 国网江苏省电力公司经济技术研究院 | A kind of assembled type base for power transmission line iron tower and its installation method |
| CN106498974A (en) * | 2016-12-27 | 2017-03-15 | 国网江苏省电力公司经济技术研究院 | A kind of assembling type base and its installation method for power transmission tower |
| CN114592533B (en) * | 2022-03-14 | 2024-03-12 | 北京恒华伟业科技股份有限公司 | Rammed broken stone micro pile photovoltaic foundation and construction method thereof |
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| CN104018516A (en) * | 2014-06-13 | 2014-09-03 | 江苏省电力设计院 | Power transmission line concrete cast-in-situ sand core gravity type foundation in desert area |
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Effective date of registration: 20160620 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China Electric Power Research Institute Applicant after: State Grid Sichuan Electric Power Corporation Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: China Electric Power Research Institute |
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