CN113882424B - Reinforcing method for newly added foundation bolts of tower foot plates of old line iron tower - Google Patents
Reinforcing method for newly added foundation bolts of tower foot plates of old line iron tower Download PDFInfo
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- CN113882424B CN113882424B CN202111342581.3A CN202111342581A CN113882424B CN 113882424 B CN113882424 B CN 113882424B CN 202111342581 A CN202111342581 A CN 202111342581A CN 113882424 B CN113882424 B CN 113882424B
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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
- E02D37/00—Repair of damaged foundations or foundation structures
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Abstract
The invention discloses a method for reinforcing newly added foundation bolts of tower foot plates of old line iron towers, which comprises the steps of firstly calculating the foundation acting force of the iron tower, judging whether the bearing capacity of the tower foot plates meets the actual use requirement, and then carrying out reinforcement transformation comprising the steps of connecting an outer splicing bottom plate at the outer edge of the bottom plate, lofting the outer foot bolts and connecting stiffening plates on the tower foot plates which do not meet the actual use requirement; the invention increases the force transfer area between the tower foot plate and the foundation, improves the bearing capacity of the tower foot plate part of the iron tower, and has simple and easy operation of the implementation method, good economic benefit and wide application range.
Description
Technical Field
The patent relates to a reinforcing method for newly added foundation bolts of foot plates of old line iron tower, belonging to the field of overhead transmission line engineering.
Background
The transmission line iron tower is used as a supporting point of an overhead transmission line, a lead and a ground wire are connected onto the transmission line iron tower, acting load is transmitted to a foundation base through the iron tower, a tower foot plate and a foundation bolt are used as a connecting part of the iron tower and the foundation, the bearing capacity of the foundation after pouring is determined and the foundation is not possible to replace, but the phenomenon that the bearing capacity of the original tower foot plate part is insufficient is more serious along with the improvement of design standards and the change of use requirements, particularly the phenomenon of ice coating in winter is serious, and the acting force transmitted to the foundation through the iron tower is increased to some extent. The original reconstruction method is mainly used for building a new tower by selecting a new site, however, the reconstruction method brings higher engineering counterfeiting and longer power failure operation time, and generates larger social influence and economic property loss, so that the reinforcement and reconstruction of the original tower foot plate become the most economical, reasonable and convenient solution.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the reinforcing method for reinforcing and transforming the new foundation bolts of the tower foot plates of the old line iron tower is provided, the bearing capacity of the tower foot plate parts is improved on the basis that new towers are assembled without re-site selection, and the problem that the bearing capacity of the tower foot plate parts is insufficient is solved.
The technical scheme of the invention is as follows: a newly-added foundation bolt reinforcing method for a foot plate of an old line iron tower comprises the following steps: calculating the foundation acting force of the iron tower, judging whether the bearing capacity of the tower foot plate meets the actual use requirement, and then performing reinforcement transformation including connection of an outer splicing bottom plate on the outer edge of the bottom plate, lofting of an outer foot bolt and connection of a stiffening plate on the tower foot plate which does not meet the actual use requirement; the outer anchor bolt is 35# high-quality carbon steel, and the effective diameter calculation formula of the anchor bolt is as follows:
in the formula:
n is the maximum pull-up force;
n is the number of foundation bolts;
d e is the effective diameter of the foundation bolt;
m is the number of the bolts with outer feet;
d a is the effective diameter of the outer footing bolt;
the calculation formula of the anchoring length of the outer foundation bolt is as follows:
in the formula:
l a is the anchor length of the anchor bolt;
ζ a the correction coefficient of the anchoring length is obtained, and 0.8 is taken when the thickness of the protective layer of the anchoring steel bar is 3d, and 0.7 is taken when the thickness is not less than 5 d;
f t is the design value of the tensile strength of the concrete;
d is the outer footing bolt diameter;
alpha is the correction coefficient of the shape of the anchoring steel bar, and is 0.16.
Preferably, the method for calculating the foundation acting force of the iron tower comprises the following steps: the method comprises the steps of firstly calculating the electric load effect of the iron tower under various working condition combinations, and then calculating the foundation acting force of the iron tower under the action of various working condition combinations according to a space truss model and a structural mechanics calculation method.
Preferably, the method for calculating the electric load effect of the iron tower comprises the following steps: according to the regulations in the overhead transmission line load specification (DL/T5551-2018), the electric load effect of the iron tower under various working condition combinations is calculated by combining the actual use conditions of the iron tower and the new planning use requirements; the actual using conditions of the iron tower comprise a corner degree, a horizontal span, a vertical span, a representative span, a ground wire safety coefficient, design icing and design wind speed; the new planning use requirements comprise the number of turning angles, the horizontal span, the vertical span, the representative span, the ground wire safety factor, the design icing and the design wind speed.
Preferably, the various operating conditions include high wind, icing, uneven icing, low temperature, wire breakage, installation and yearly flattening.
Preferably, the maximum uplifting force and the maximum downforce are selected according to the foundation acting force of the iron tower, whether the bearing capacity of the iron tower meets the actual use requirement or not is judged according to the technical specification of the design of the tower structure of the overhead transmission line (DL/T5154-2012), and the tower foot plate which does not meet the actual use requirement is reinforced and transformed.
Preferably, the method for reinforcing and modifying the tower foot plate comprises the following steps: firstly, newly drilling bolt holes on a foundation, then welding an outer splicing bottom plate by performing single-side notch welding in the horizontal direction outside the bottom plate, additionally arranging outer foundation bolts, finally vertically welding a connecting stiffening plate on the bottom plate and the outer splicing bottom plate, and screwing nuts of the outer foundation bolts; the welding length of the connecting stiffening plate and the bottom plate is not less than 10 times of the size of a welding leg and not less than 60mm, and the connecting length of the connecting stiffening plate and the outer splicing bottom plate is-50 mm of the width of the outer splicing bottom plate; the welding position of the connecting stiffening plate is determined according to the construction layout of the tower foot plate on site, the stiffening plate and the gasket of the tower foot plate are avoided during welding, and the installation of the outer foot bolt is not influenced; 4 outer foundation bolts are symmetrically distributed, and after the outer foundation bolts are inserted into the foundation, the rest gaps are blocked by injecting cement mortar, and the strength grade of the cement mortar is not lower than 30MPa; the newly-opened hole is determined by the hole of the outer splicing bottom plate from the newly-opened hole on the basis, the drilling depth is the anchoring depth plus 50mm, and the requirement of the minimum protective layer thickness of the bolt with the outer lateral foot is met, namely the protective layer is not less than 3 times of the diameter of the bolt with the outer lateral foot.
Preferably, the outer splicing bottom plate is made of an L-shaped steel plate material with a round hole; the outer splicing bottom plate and the tower foot plate are equal in thickness, and the width of the steel plate is determined by the edge distance of the outer foot bolt; the aperture of the round hole is determined according to the requirements of appendix B of drawing and construction provisions of transmission line towers (DL/T5442-2020).
Preferably, the connecting stiffening plates are made of steel plate materials, the length-height ratio of the connecting stiffening plates is 0.5-1.0, and the thickness of the connecting stiffening plates is 0.6-0.7 times of that of the step foot plate boot plate.
Preferably, the outer splicing bottom plate and the connecting stiffening plate both adopt a hot galvanizing process.
The invention has the beneficial effects that: on the basis of not re-selecting the site to assemble a new tower, the invention improves the bearing capacity of the tower foot plate part and solves the problem that the bearing capacity of the tower foot plate part does not meet the actual use requirement; the iron tower is prevented from being abandoned or even pushed down due to the fact that the bearing capacity of the iron tower does not meet the actual use requirement, the reinforcing method is simple and easy to implement, the needed manpower, material resources and time are few, and the method has popularization value.
Drawings
FIG. 1 is a front view of a tower foot plate;
FIG. 2 shows the anchor bolts attached to the foundation;
FIG. 3 is a plan view of a non-outrigger bolt;
FIG. 4 is a plan view of the outer assembled base plate;
FIG. 5 is a schematic view of the connection of the stiffener with the bottom plate and the outer-spliced bottom plate;
description of reference numerals:
1. the tower body comprises a tower body main material 2, a tower body inclined material 3, a boot plate 4, a stiffening plate 5, a bottom plate 6, foundation bolts 7, a foundation 8, outer footing bolts 9, an outer splicing bottom plate 10 and a connecting stiffening plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1 was carried out: referring to fig. 1 to 5, a method for reinforcing a newly added foundation bolt of a tower foot plate of an old line iron tower includes: firstly, calculating the foundation acting force of the iron tower, judging whether the bearing capacity of the tower foot plate meets the actual use requirement, and then carrying out reinforcement transformation including connection of an outer splicing bottom plate 9 and an outer foot bolt 8 on the outer edge of the bottom plate 5 and connection of a stiffening plate 10 on the tower foot plate which does not meet the actual use requirement; the bearing capacity of the tower foot plate part is improved by increasing the force transfer area between the tower foot plate and the foundation 7; preferably, the outer footing bolt 8 is made of 35# high-quality carbon steel, and the outer footing bolt 8 can enhance the acting force transmitted by the tower body to the foundation 7; the effective diameter calculation formula of the foundation bolt 6 is as follows:
in the formula:
n is the maximum pull-up force;
n is the number of foundation bolts 6;
d e is the effective diameter of the foundation bolt 6;
m is the number of the outer skirting bolts of 8;
d a is the effective diameter of the outer footing bolt 8;
the calculation formula of the anchoring length of the outer foundation bolt 8 is as follows:
in the formula:
l a is the anchoring length of the anchor bolt 8;
ζ a the correction coefficient of the anchoring length is obtained, and 0.8 is taken when the thickness of the protective layer of the anchoring steel bar is 3d, and 0.7 is taken when the thickness is not less than 5 d;
f t is the design value of the tensile strength of the concrete;
d is the outer toe bolt 8 diameter;
alpha is the correction coefficient of the shape of the anchoring steel bar, and is 0.16.
Preferably, the method for calculating the acting force of the iron tower foundation 8 comprises the following steps: firstly, calculating the electric load effect of the iron tower under various working condition combinations, and then calculating the foundation acting force of the iron tower under the action of various working condition combinations according to a space truss model and a structural mechanics calculation method; therefore, the actual basic acting force of the iron tower after the iron tower is put into use can be known.
Preferably, the method for calculating the electric load effect of the iron tower comprises the following steps: according to the regulations in the overhead transmission line load specification (DL/T5551-2018), the electric load effect of the iron tower under various working condition combinations is calculated by combining the actual use conditions of the iron tower and the new planning use requirements; the actual using conditions of the iron tower comprise a corner degree, a horizontal span, a vertical span, a representative span, a ground wire safety coefficient, design icing and design wind speed; the new planning use requirements comprise the number of turning angles, the horizontal span, the vertical span, the representative span, the ground wire safety factor, the design icing and the design wind speed. The calculation of the electric load effect of the iron tower provides a basis for calculating the foundation acting force of the iron tower.
Preferably, various working conditions comprise strong wind, icing, uneven icing, low temperature, wire breakage, installation and annual average; when the foundation acting force of the iron tower is calculated, acting forces transmitted to the iron tower by the lead wires and the ground wires under various working condition combinations are considered in addition to the self weight of the iron tower, wind load and ice load, so that various working conditions need to be considered in calculating the electric load effect.
Preferably, the maximum uplifting force and the maximum downforce are selected according to the foundation acting force of the iron tower, whether the bearing capacity of the iron tower meets the actual use requirement or not is judged according to the technical provisions for designing the structure of the tower of the overhead transmission line (DL/T5154-2012), and the tower foot plate which does not meet the actual use requirement is reinforced and transformed; the bearing capacity of the iron tower is judged according to the actual use requirement, and the iron tower which does not meet the actual use requirement is reinforced and transformed in time, so that the social influence caused by poor operation of the iron tower is reduced.
Preferably, the method for reinforcing and modifying the tower foot plate comprises the following steps: newly drilling a bolt hole on a foundation 7, then performing single-side opening welding on the outer edge of the bottom plate 5 in the horizontal direction to form an outer splicing bottom plate 9, additionally arranging an outer foundation bolt 8, finally vertically welding a connecting stiffening plate 10 on the bottom plate 5 and the outer splicing bottom plate 9, and screwing a nut of the outer foundation bolt 9; the welding length of the connecting stiffening plate 10 and the bottom plate is not less than 10 times of the size of a welding leg and not less than 60mm, and the connecting length of the connecting stiffening plate and the outer splicing bottom plate 9 is between the width of the outer splicing bottom plate 9 and 50mm; the welding position of the connecting stiffening plate 10 is determined according to the construction layout of the tower foot plate on site, the stiffening plate 4 and the gasket of the tower foot plate are avoided during welding, and the installation of the outer foot bolt 8 is not influenced; 4 outer foundation bolts 8 are symmetrically distributed, after the outer foundation bolts 8 are inserted into the foundation 7, the rest gaps are blocked by injected cement mortar, and the strength grade of the cement mortar is not lower than 30MPa; the newly-opened hole on the foundation 7 is determined by the newly-opened hole and the hole of the outer splicing bottom plate 9, the drilling depth is the anchoring depth plus 50mm, and the requirement of the minimum protective layer thickness of the outer footing bolt 8 is met, namely the protective layer is not less than 3 times of the diameter of the outer footing bolt 8; after the tower foot plate is reinforced and transformed, the force transfer area between the tower foot plate and the foundation 7 is generally increased, the connection between the tower foot plate and the foundation is enhanced, the bearing capacity of the tower foot plate is improved, and the tower foot plate can meet the actual use requirements.
Preferably, the outer splicing bottom plate 9 is made of an L-shaped steel plate material with a round hole; the outer splicing bottom plate 9 is equal to the original bottom plate 5 of the tower foot plate in thickness, and the width of the steel plate is determined by the edge distance of the outer foot bolt 8; the aperture of the round hole is determined according to the requirements in appendix B of drawing and construction provisions of transmission line towers (DL/T5442-2020); the outer assembled bottom plate 9 is used for enlarging the force transmission area between the tower foot plate and the foundation 7.
Preferably, the connecting stiffening plates 10 are made of steel plate materials, the length-height ratio of the connecting stiffening plates 10 is 0.5-1.0, and the thickness of the connecting stiffening plates is 0.6-0.7 times of that of the step foot plate boot plate 3; the connection stiffening plate 10 reinforces the connection between the outer splicing bottom plate 9 and the bottom plate 5.
Preferably, the outer splicing bottom plate 9 and the connecting stiffening plate 10 both adopt a hot galvanizing process, so that the outer splicing bottom plate and the connecting stiffening plate have an anti-corrosion function.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all should be considered as belonging to the protection scope of the invention.
Claims (9)
1. The utility model provides an old circuit iron tower column foot board newly-increased rag bolt reinforcement method which characterized in that includes: firstly, calculating the foundation acting force of the iron tower, judging whether the bearing capacity of the tower foot plate meets the actual use requirement, and then carrying out reinforcement transformation including connection of an outer splicing bottom plate (9) and an outer foot bolt (8) on the outer edge of the bottom plate (5) and connection of a stiffening plate (10) on the tower foot plate which does not meet the actual use requirement; the outer anchor bolt (8) is 35# high-quality carbon steel, and the effective diameter calculation formula of the anchor bolt (6) is as follows:
in the formula:
n is the maximum pull-up force;
n is the number of the foundation bolts (6);
d e is the effective diameter of the foundation bolt (6);
m is the number of the outer footing bolts (8);
d a is the effective diameter of the outer footing bolt (8);
the calculation formula of the anchoring length of the anchor bolt (8) with the outer footing is as follows:
in the formula:
l a is the anchoring length of the anchor bolt (8);
ζ a the correction coefficient of the anchoring length is obtained, and 0.8 is taken when the thickness of the protective layer of the anchoring steel bar is 3d, and 0.7 is taken when the thickness is not less than 5 d;
f t is the design value of the tensile strength of the concrete;
d is the outer footing bolt (8) diameter;
alpha is the correction coefficient of the shape of the anchoring steel bar, and is 0.16.
2. The method for reinforcing the newly added foundation bolts of the foot plates of the old line iron tower according to claim 1, wherein the method for calculating the foundation acting force of the iron tower comprises the following steps: the method comprises the steps of firstly calculating the electric load effect of the iron tower under various working condition combinations, and then calculating the foundation acting force of the iron tower under the action of various working condition combinations according to a space truss model and a structural mechanics calculation method.
3. The method for reinforcing the newly added foundation bolts of the foot plates of the old line iron tower according to claim 2, wherein the method for calculating the electric load effect of the iron tower comprises the following steps: according to the regulations in the overhead transmission line load specification (DL/T5551-2018), the electric load effect of the built iron tower under various working condition combinations is calculated by combining the actual use conditions of the iron tower and the new planning use requirements; the actual using conditions of the iron tower comprise a corner degree, a horizontal span, a vertical span, a representative span, a ground wire safety coefficient, design icing and design wind speed; the new planning use requirements comprise the number of turning angles, the horizontal span, the vertical span, the representative span, the ground wire safety factor, the design icing and the design wind speed.
4. The method for reinforcing the newly added foundation bolts of the foot plates of the old line iron tower according to claim 2, wherein the method comprises the following steps: various working conditions include strong wind, icing, uneven icing, low temperature, broken wire, installation and annual average.
5. The method for reinforcing the newly added foundation bolts of the foot plates of the old line iron tower according to claim 1, wherein the method comprises the following steps: the method comprises the steps of selecting the maximum uplifting force and the maximum downforce from the foundation acting force of the iron tower, judging whether the bearing capacity of the iron tower meets the actual use requirement according to the technical specification of the design of the tower structure of the overhead transmission line (DL/T5154-2012), and reinforcing and transforming the tower foot plate which does not meet the actual use requirement.
6. The method for reinforcing the newly added foundation bolts of the tower foot plate of the old line iron tower according to claim 1, wherein the method for reinforcing and reconstructing the tower foot plate comprises the following steps: firstly, newly drilling bolt holes on a foundation (7), then welding an outer splicing bottom plate (9) through a single-side cut in the horizontal direction outside the bottom plate (5), additionally arranging an outer footing bolt (8), finally vertically welding a connecting stiffening plate (10) on the bottom plate (5) and the outer splicing bottom plate (9), and screwing a nut of the outer footing bolt (8); the welding length of the connecting stiffening plate (10) and the bottom plate is not less than 10 times of the size of a welding leg and not less than 60mm, and the connecting length of the connecting stiffening plate and the outer splicing bottom plate (9) is-50 mm of the width of the outer splicing bottom plate (9); the welding position of the connecting stiffening plate (10) is determined according to the construction layout of the tower foot plate on site, the stiffening plate (4) and the gasket of the tower foot plate are avoided during welding, and the installation of the outer foot bolt (8) is not influenced; the number of the outer footing bolts (8) is 4, the outer footing bolts are distributed in a symmetrical mode, after the outer footing bolts (8) are inserted into the foundation (7), the rest gaps are blocked by injecting cement mortar, and the strength grade of the cement mortar is not lower than 30MPa; the newly-opened hole on the foundation (7) is determined by the hole of the outer splicing bottom plate (9), the drilling depth is the anchoring depth plus 50mm, and the requirement of the minimum protective layer thickness of the anchor bolt (8) is met, namely the protective layer is not less than 3 times of the diameter of the anchor bolt (8).
7. The method for reinforcing the newly added foundation bolts of the foot plates of the old line iron tower according to claim 1, wherein the method comprises the following steps: the outer splicing bottom plate (9) is made of an L-shaped steel plate material with a round hole; the outer splicing bottom plate (9) is equal in thickness to the original bottom plate (5) of the tower foot plate, and the width of the steel plate is determined by the edge distance of the outer foot bolt (8); the aperture of the round hole is determined according to the requirements of appendix B of drawing and construction provisions of transmission line towers (DL/T5442-2020).
8. The method for reinforcing the newly added foundation bolts of the foot plates of the old line iron tower according to claim 1, wherein the method comprises the following steps: the connecting stiffening plate (10) is made of steel plate materials, the length-height ratio of the connecting stiffening plate (10) is 0.5-1.0, and the thickness of the connecting stiffening plate is 0.6-0.7 times of that of the step foot plate boot plate (3).
9. The method for reinforcing the newly added foundation bolts of the foot plates of the old line iron tower according to claim 1, wherein the method comprises the following steps: the outer splicing bottom plate (9) and the connecting stiffening plate (10) both adopt hot galvanizing technology.
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| CN202111342581.3A CN113882424B (en) | 2021-11-12 | 2021-11-12 | Reinforcing method for newly added foundation bolts of tower foot plates of old line iron tower |
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| CN202111342581.3A CN113882424B (en) | 2021-11-12 | 2021-11-12 | Reinforcing method for newly added foundation bolts of tower foot plates of old line iron tower |
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| CN113882424B true CN113882424B (en) | 2023-04-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201722970U (en) * | 2010-07-03 | 2011-01-26 | 烟台电力设计院有限责任公司 | Device for fixing rock foundation of transmission line pylon |
| CN104778291B (en) * | 2014-01-14 | 2019-01-29 | 国家电网公司 | A kind of minery electric power pylon bearing capacity evaluation method based on monitoring foundation deformation |
| CN204098059U (en) * | 2014-11-14 | 2015-01-14 | 四川电力设计咨询有限责任公司 | For the electric power pylon basis of high-strength bolt |
| CN208235563U (en) * | 2018-04-03 | 2018-12-14 | 南方电网科学研究院有限责任公司 | Reinforcing device of power transmission tower foundation, power transmission tower foundation and power transmission tower |
| CN110616733A (en) * | 2019-10-25 | 2019-12-27 | 中国电建集团贵州电力设计研究院有限公司 | Integral reinforcing device and method for foundation and component of power transmission tower |
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