CN210395412U - Prestressed anchor pile uplift foundation suitable for overhead transmission line in mountain area - Google Patents
Prestressed anchor pile uplift foundation suitable for overhead transmission line in mountain area Download PDFInfo
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- CN210395412U CN210395412U CN201920988975.8U CN201920988975U CN210395412U CN 210395412 U CN210395412 U CN 210395412U CN 201920988975 U CN201920988975 U CN 201920988975U CN 210395412 U CN210395412 U CN 210395412U
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Abstract
The utility model discloses a prestressed anchor pile uplift foundation suitable for overhead transmission lines in mountain areas, which comprises a main column, a bearing platform and a plurality of prestressed anchor piles; the main column is vertically arranged above the bearing platform, the bearing platform is buried underground, and the upright column and the bearing platform are cast in situ into a whole; the upper end surface of the upright post is provided with a tower foot plate, an embedded steel plate is arranged in the bearing platform, and the upper end and the lower end of the foundation bolt are respectively fixed on the tower foot plate and the embedded steel plate through nuts; the prestressed anchor pile comprises anchor bars, the lower parts of the anchor bars are anchoring sections anchored underground, and the upper parts of the anchor bars are free sections which are tensioned and prestressed and then locked on the upper surface of the bearing platform. The foundation type has the advantages of low requirement on terrain and geology, capability of mechanical construction, good corrosion resistance, low concrete consumption and the like, and can overcome the limitation of application of the excavation foundation and the anchor pile foundation.
Description
Technical Field
The utility model relates to a transmission of electricity design field especially relates to a prestressed anchorage stake resistance to plucking basis suitable for mountain area overhead transmission line.
Background
The power transmission tower is used as a transmission carrier of high-voltage electric energy, is a tower structure for supporting and erecting a lead, a lightning conductor and other accessories, has the characteristics of high tower body and high flexibility, and mainly bears various loads such as wind load, lead load and the like. At present, the mountain area power transmission line foundation mainly adopts a hole digging foundation, and due to the fact that hole forming equipment is heavy, the mechanization degree of foundation pit digging is very low, manual digging is usually adopted, but the manual digging speed is low, the safety is poor, and the scope of strict use limitation is listed in part of provinces. The foundation which is convenient for the mountain mechanical construction is a rock anchor pile foundation, but the rock anchor pile foundation has high requirements on the terrain gradient, the covering layer thickness, the rock weathering degree and the integrity, so that the application of the rock anchor pile foundation in a mountain power transmission line is limited, and the general applicability is relatively poor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a prestressed anchorage stake resistance to plucking basis suitable for mountain area overhead transmission line, this basic pattern have to the topography geology require lower, can develop mechanized construction, corrosion resistance is good and the concrete use amount is low grade advantage, can overcome the limitation of digging hole basis and anchor stake basis application.
The utility model adopts the technical scheme as follows:
a prestressed anchor pile uplift foundation suitable for overhead transmission lines in mountainous areas comprises a main column, a bearing platform and a plurality of prestressed anchor piles; the main column is vertically arranged above the bearing platform, the bearing platform is buried underground, and the upright column and the bearing platform are cast in situ into a whole; the upper end surface of the upright post is provided with a tower foot plate, an embedded steel plate is arranged in the bearing platform, and the upper end and the lower end of the foundation bolt are respectively fixed on the tower foot plate and the embedded steel plate through nuts; the prestressed anchor pile comprises anchor bars, the lower parts of the anchor bars are anchoring sections anchored underground, and the upper parts of the anchor bars are free sections which are tensioned and prestressed and then locked on the upper surface of the bearing platform.
Furthermore, a sleeve is arranged outside the free section, a lubricant is arranged between the anchor bars and the sleeve, the lubricant is preferably grease, and the anchoring section is filled with cement mortar.
Furthermore, the free section penetrates through a soil layer and a strongly weathered rock layer, and the length of the free section is determined according to the thickness of the loose layer; the anchoring section is anchored into the stroke chemical rock stratum, and the length is determined according to the bearing capacity requirement.
Furthermore, the free section is fixed on the upper surface of the bearing platform through an anchor pier after being tensioned and prestressed.
Furthermore, the stress loss of the free section is between 15% and 25%, and the prestress loss can be further reduced by adopting measures such as supertension, secondary compensation tension, low-relaxation high-strength steel bars, circulating tension and the like; the length of the free section is 6-9 m, and the pre-pressing requirement of foundation soil is met.
Furthermore, the top ends of the anchor bars are uniformly distributed around the upright posts and are anchored underground obliquely outwards or vertically downwards.
Further, the number of the prestressed anchor piles can be increased or decreased according to the bearing capacity requirement, and can be 8, 12, 16 or 20, and preferably 12.
Furthermore, the vertical center line of the upright post is not coincident with the vertical center line of the bearing platform, and the vertical center line of the upright post deviates towards the vertical center line of the iron tower.
In the technical scheme, the section size of the main column meets the requirement of eccentricity of the tower foot plate and meets the requirement of section strength; the sizes of the main column and the bearing platform are both reinforced concrete structures, so that the anchoring requirement of foundation bolts is met, and the requirements on section strength and foundation bearing capacity are met; the anchor pile meets the requirement of the uplift bearing capacity of the foundation; after the bearing platform concrete is cured to a certain strength, tensioning and locking of the anchor bars are carried out, and the anchor pier meets the requirement of local compression resistance; when the anchor bars are pre-tensioned, the pre-tensioning value meets the requirements of the strength of the anchor bars and the bearing capacity of foundation soil on the bottom surface of the bearing platform, the soil body at the bottom of the bearing platform can be in a compacted state, and the normal use requirement after stress is met.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
(1) the mechanical construction rate of the power transmission line in the mountain area is improved, and the construction safety risk is reduced
The utility model discloses in, prestressed anchorage stake divides free section and anchor section, through the length of adjusting the anchor stake free section, can pierce through topsoil layer and strong weathering layer, transmits basic effort for the anchor section. The stress is satisfied, and the application range of the conventional anchor pile foundation is expanded. Anchor pile basis drilling equipment can be disassembled into the widget, and convenient transportation is applicable to mountain area circuit construction. The foundation excavation can realize the mechanization of overall process, effectively reduces the risk of adopting the manual work to carry out deep basal pit excavation operation.
(2) Improve the corrosion resistance of the anchor pile
When the conventional anchor pile foundation bears repeated pressure-pull load, a concrete layer around the anchor pile is easy to crack; meanwhile, the surrounding rock stratum is easy to loosen under repeated load, so that the bond stress between the concrete and the rock stratum is reduced. On one hand, the whole uplift resistance of the anchor pile foundation can be weakened, and on the other hand, the cracking of the concrete causes the anchor pile to be exposed in the medium of air, water and soil, so that the corrosion problem is easily caused. By adopting the novel anchor pile foundation and applying the prestress to the anchor pile, the surrounding rock strata and the concrete layer are in a pressed state, the invasion of other surrounding media is better blocked, and the anchor pile is effectively protected. Furthermore, the utility model discloses in, the anchor head adopts concrete anchor pier to do anticorrosive, and the anchor bar free segment adopts the sleeve pipe of pouring into grease to do anticorrosive, and anchor bar anchor section adopts cement mortar to do anticorrosive.
(3) Shortening construction period and improving power grid construction efficiency
The conventional hole digging foundation is large in excavation amount, low in excavation speed and long in construction period. Meanwhile, the volume of concrete is large, and the transportation in mountainous areas is difficult, so that the construction difficulty is further increased. By adopting the anchor pile uplift foundation, the construction difficulty is reduced by optimizing the use amount of concrete; meanwhile, the whole process mechanical excavation is adopted, and the excavation efficiency is improved, so that the purposes of shortening the construction period and improving the construction efficiency are achieved.
(4) Reduce the amount of foundation excavation and spoil projects, and enhance the environmental protection of the tower
Adopt the utility model provides an anchor pile resistance to plucking basis, concrete engineering volume are less than and dig the hole basis, and basic excavation volume and spoil engineering volume also effectively reduce, have played the effect of favorable protection to mountain area tower position environment.
(5) The economic benefit is remarkable, and the investment is effectively saved
Take mountain area extra-high voltage 800kV direct current engineering as an example, adopt the utility model provides an anchor pile resistance to plucking basis practices thrift investment 10% ~ 20% than conventional anchor pile basis, practices thrift investment 20% ~ 25% than digging hole basis, and is significant to reducing the engineering investment.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a schematic structural view of a free segment;
FIG. 4 is a schematic structural view of an anchor segment;
FIG. 5 is a schematic top view of the eccentric placement of the vertical post;
fig. 6 is a schematic front view of the upright post in an eccentric arrangement.
Description of reference numerals:
1-slope line, 2-upright post, 3-bearing platform, 31-bearing platform steel bar, 4-prestressed anchor pile, 41-anchor bar, 42-anchoring section, 43-free section, 44-anchor pier, 45-sleeve, 46-grease, 47-cement mortar, 5-anchor bolt, 51-nut, 6-tower foot plate and 7-embedded steel plate.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1:
referring to fig. 1 to 4, in the present embodiment, a prestressed anchor pile uplift foundation suitable for an overhead transmission line in a mountain area includes a main column 2, a bearing platform 3, and twelve prestressed anchor piles 4; the main column 2 is vertically arranged above the bearing platform 3, the bearing platform 3 is buried underground, and the upright column 2 and the bearing platform 3 are cast in situ into a whole; the upper end surface of the upright post 2 is provided with a tower foot plate 6, an embedded steel plate 7 is arranged in the bearing platform 3, and the upper end and the lower end of the foundation bolt 5 are respectively fixed on the tower foot plate 6 and the embedded steel plate 7 through nuts 51; the prestressed anchor pile 4 comprises anchor bars 41, the top ends of the anchor bars 41 are uniformly distributed around the upright post 2 and are vertically and downwardly anchored underground; the lower part of the anchor bar 41 is an anchoring section 42 anchored underground, and the upper part of the anchor bar 41 is a free section 43 which is locked on the upper surface of the bearing platform 3 through an anchor pier 44 after being tensioned and prestressed; the anchoring section 42 is anchored into the middle weathered rock stratum, and the free section 43 penetrates through the soil layer and the strong weathered rock stratum; a sleeve 45 is arranged outside the free section 43, grease 46 is filled between the anchor bar 41 and the sleeve 45, and cement mortar 47 is filled in the anchor section 42; the stress loss of the free section 43 is between 15% and 25%; the free section 43 has a length of 7 m.
Example 2:
the present embodiment is different from embodiment 1 in that:
referring to fig. 5-6, in the present embodiment, the vertical center lines of the upright column 2 and the bearing platform 3 are not coincident, and the vertical center line of the upright column 2 is offset toward the vertical center line of the iron tower.
Example 3:
the present embodiment is different from embodiment 1 in that:
in this embodiment, the top ends of the anchor bars 41 are uniformly distributed around the vertical column 2, and are anchored in the ground obliquely outward and downward.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. The utility model provides a prestressed anchorage stake resistance to plucking basis suitable for mountain area overhead transmission line which characterized in that: the device comprises a main column, a bearing platform and a plurality of prestressed anchor piles; the main column is vertically arranged above the bearing platform, the bearing platform is buried underground, and the upright column and the bearing platform are cast in situ into a whole; the upper end surface of the upright post is provided with a tower foot plate, an embedded steel plate is arranged in the bearing platform, and the upper end and the lower end of the foundation bolt are respectively fixed on the tower foot plate and the embedded steel plate through nuts; the prestressed anchor pile comprises anchor bars, the lower parts of the anchor bars are anchoring sections anchored underground, and the upper parts of the anchor bars are free sections which are tensioned and prestressed and then locked on the upper surface of the bearing platform.
2. The prestressed anchor pile uplift foundation applicable to overhead transmission lines in mountainous areas as claimed in claim 1, wherein: the free section is externally provided with a sleeve, a lubricant is arranged between the anchor bars and the sleeve, and the anchoring section is filled with cement mortar.
3. The prestressed anchor pile uplift foundation suitable for the overhead power transmission line in the mountainous area as claimed in claim 1 or 2, wherein: the free section penetrates through the soil layer and the strongly weathered rock layer, and the anchoring section is anchored into the moderately weathered rock layer.
4. The prestressed anchor pile uplift foundation suitable for the overhead power transmission line in the mountainous area as claimed in claim 3, wherein: the length of the free section is determined according to the thickness of a soil layer and a weathered rock stratum, and the length of the anchoring section is determined according to the bearing capacity requirement.
5. The prestressed anchor pile uplift foundation suitable for the overhead power transmission line in the mountainous area as claimed in claim 1 or 2, wherein: and the free section is fixed on the upper surface of the bearing platform through an anchor pier after being tensioned and prestressed.
6. The prestressed anchor pile uplift foundation suitable for the overhead power transmission line in the mountainous area as claimed in claim 1 or 2, wherein: the stress loss of the free section is between 15% and 25%, and the length of the free section is 6-9 m.
7. The prestressed anchor pile uplift foundation suitable for the overhead power transmission line in the mountainous area as claimed in claim 1 or 2, wherein: the top ends of the anchor bars are uniformly distributed around the upright posts and are anchored underground obliquely outwards or vertically downwards.
8. The prestressed anchor pile uplift foundation suitable for the overhead power transmission line in the mountainous area as claimed in claim 1 or 2, wherein: the number of the prestressed anchor piles is 8 or 12 or 16 or 20.
9. The prestressed anchor pile uplift foundation suitable for the overhead power transmission line in the mountainous area as claimed in claim 1 or 2, wherein: the upright post is not coincident with the vertical center line of the bearing platform, and the vertical center line of the upright post deviates towards the vertical center line of the iron tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920988975.8U CN210395412U (en) | 2019-06-27 | 2019-06-27 | Prestressed anchor pile uplift foundation suitable for overhead transmission line in mountain area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920988975.8U CN210395412U (en) | 2019-06-27 | 2019-06-27 | Prestressed anchor pile uplift foundation suitable for overhead transmission line in mountain area |
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| CN210395412U true CN210395412U (en) | 2020-04-24 |
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| CN201920988975.8U Active CN210395412U (en) | 2019-06-27 | 2019-06-27 | Prestressed anchor pile uplift foundation suitable for overhead transmission line in mountain area |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111910671A (en) * | 2020-07-20 | 2020-11-10 | 国网浙江省电力有限公司丽水供电公司 | Prestressed anchor rod combined excavation composite foundation and construction method thereof |
| CN113431075A (en) * | 2021-07-27 | 2021-09-24 | 中国电建集团福建省电力勘测设计院有限公司 | Herringbone pile anchor assembly type foundation suitable for low-voltage power transmission line |
| CN113818746A (en) * | 2021-09-30 | 2021-12-21 | 峻江建设有限公司 | Iron tower applied to plateau mountain area |
-
2019
- 2019-06-27 CN CN201920988975.8U patent/CN210395412U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111910671A (en) * | 2020-07-20 | 2020-11-10 | 国网浙江省电力有限公司丽水供电公司 | Prestressed anchor rod combined excavation composite foundation and construction method thereof |
| CN113431075A (en) * | 2021-07-27 | 2021-09-24 | 中国电建集团福建省电力勘测设计院有限公司 | Herringbone pile anchor assembly type foundation suitable for low-voltage power transmission line |
| CN113818746A (en) * | 2021-09-30 | 2021-12-21 | 峻江建设有限公司 | Iron tower applied to plateau mountain area |
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