CN110805060B - Base structure for stay wire of stay wire tower and stay wire fixing method - Google Patents
Base structure for stay wire of stay wire tower and stay wire fixing method Download PDFInfo
- Publication number
- CN110805060B CN110805060B CN201911107048.1A CN201911107048A CN110805060B CN 110805060 B CN110805060 B CN 110805060B CN 201911107048 A CN201911107048 A CN 201911107048A CN 110805060 B CN110805060 B CN 110805060B
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- Prior art keywords
- foundation
- stay wire
- foundation part
- tower
- top surface
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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
- E02D27/50—Anchored foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/20—Side-supporting means therefor, e.g. using guy ropes or struts
Abstract
The invention relates to a foundation structure for guy wire of a guy tower and a guy wire fixing method, comprising a first foundation part buried under the ground, wherein the bottom of the first foundation part is buried with at least one spiral anchor, the top surface of the first foundation part is provided with a second foundation part, the horizontal section area of the second foundation part is smaller than that of the top surface of the first foundation part, and the top surface of the second foundation part is used for extending above the ground and is connected with the end part of the guy wire.
Description
Technical Field
The invention relates to the technical field of transmission line tower foundations, in particular to a foundation structure for stay wires of a stay wire tower and a stay wire fixing method.
Background
Compared with a self-supporting tower, the stay wire tower is more reasonable in stress, the tower weight can be reduced by about 30%, the consumption of foundation concrete can be reduced by about 40%, the consumption of foundation reinforcing steel bars can be reduced by about 25%, the overall cost of a line is remarkably reduced, and the stay wire tower is widely utilized due to good economy of the stay wire tower.
The spiral anchor foundation is widely applied to the stay wire foundation, and the foundation type can obviously reduce the earth excavation amount, the construction difficulty and the construction cost. The inventor finds that the application of the spiral anchor foundation to the stay wire foundation also has a remarkable defect that the tension of the stay wire is seriously relaxed. The main reason for this phenomenon is that the overall stiffness of the screw anchor foundation is low, the resistance to horizontal force is weak, and the stay wire foundation is likely to generate horizontal displacement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a foundation structure for stay wires of a stay wire tower, which can effectively resist horizontal force generated by the stay wires and avoid the phenomenon of loose tension of the stay wires.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a foundation structure for guyed tower guyed, is including being used for burying underground at the below first foundation portion of ground, and at least one screw anchor has been buried to the bottom of first foundation portion, and the top surface of first foundation portion is provided with second foundation portion, and the horizontal cross-sectional area of second foundation portion is less than the top surface area of first foundation portion, the top surface of second foundation portion is used for stretching out to above the ground, with the end connection who acts as go-between.
Furthermore, the first foundation part and the second foundation part are of reinforced concrete structures which are poured at one time.
Furthermore, the first base part is of a cuboid structure, the ratio of the length to the thickness of the first base part is 2.5-5, and the face with the largest area of the first base part is used for being perpendicular to the horizontal component force generated by the stay wire.
Furthermore, the second base part is of a cube structure, and the side length of the second base part is equal to the thickness of the first base part.
Furthermore, the main reinforcement in the second foundation portion extends into the first foundation portion to serve as the vertical stress reinforcement of the first foundation portion.
Furthermore, the top surface of second basal portion is provided with the steel sheet, the steel sheet is fixed with the lantern ring, the lantern ring be used for with the tip fixed connection of acting as go-between.
Furthermore, the spiral anchor comprises a guide rod, a spiral anchor sheet is fixed on the outer peripheral surface of the guide rod, a conical anchor head is arranged at the bottom end of the guide rod, and a plurality of ring plates are arranged at the upper part of the guide rod and used for enhancing the bonding strength with the first foundation part.
Further, the spiral anchor is provided with a plurality of spiral anchors, and the axial distance between every two adjacent spiral anchors is more than 4 times of the outer diameter of the guide rod part of the spiral anchor.
A stay wire fixing method for a stay wire tower is characterized in that one end of a stay wire is fixedly connected with a tower pole, the other end of the stay wire is fixedly connected with a basic structure for the stay wire of the stay wire tower, a first basic part is buried under the ground, and the top surface of a second basic part is positioned above the ground and fixedly connected with the stay wire.
Further, the stay wire fixing method of the stay wire tower comprises the following specific steps:
step 1: and excavating a foundation pit for burying the foundation structure for the guy of the guyed tower.
Step 2: and screwing the spiral anchor into the bottom surface of the foundation pit to a set depth.
And step 3: and binding the reinforcement cages of the first foundation part and the second foundation part in the foundation pit.
And 4, step 4: and pouring concrete to form a first foundation part and a second foundation part, wherein the top surface of the first foundation part is positioned below the ground, and the top surface of the second foundation part is positioned above the ground.
And 5: and backfilling the foundation pit until the foundation pit is flush with the ground around the foundation pit, and fixing the stay wire on the top surface of the second foundation part.
The invention has the beneficial effects that:
1. the foundation structure can contact with the soil through the side surfaces of the first foundation part and the second foundation part, compared with the traditional method that the tensile force of the stay wire is borne directly through the acting force of the spiral anchor and the soil, the contact area of the foundation structure and the soil on two sides is increased, the acting force of the soil on the foundation structure is greatly increased, the capability of the foundation for resisting the horizontal component force of the stay wire is improved, the horizontal deformation of the foundation can be effectively reduced, the effective tension of the stay wire is ensured, the safety of a line tower is improved, and the foundation structure has high application value for the region with the geological condition of soil.
2. According to the foundation structure, the first foundation part is positioned in the soil, the cross-sectional area of the second foundation part is smaller than the top surface area of the first foundation part, the vertical force of the stay wire can be borne by the pressure of the soil above the first foundation part, the displacement of the top of the foundation is reduced, and the deformation resistance and the reliability of the foundation are improved.
3. According to the foundation structure, the plurality of ring plates are arranged on the upper portion of the guide rod of the spiral anchor, so that the anchoring force between the guide rod and the first foundation portion can be remarkably improved.
4. According to the foundation structure, the side length of the second foundation part is the same as the thickness of the first foundation part, and the main reinforcement of the second foundation part extends into the first foundation part to serve as the vertical stressed reinforcement, so that the connection reliability of the first foundation part and the second foundation part is guaranteed, and materials are saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic side view of the overall structure of embodiment 1 of the present invention;
FIG. 2 is a schematic front view of the overall structure of embodiment 1 of the present invention;
FIG. 3 is a schematic top view of the overall structure of embodiment 1 of the present invention;
the steel bar reinforced concrete structure comprises a first foundation portion 1, a second foundation portion 2, a ground 3, a spiral anchor 4, a guide rod 4-1, a spiral anchor sheet 4-2, an anchor head 4-3, a ring plate 4-4, a steel bar cage 5-1, a main rib 5-2, a stirrup 6, a steel plate 7, a ring and a stay wire 8.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
As described in the background art, the guy wire of the existing guy tower is fixed by a spiral anchor, and the tension relaxation phenomenon of the guy wire is serious.
In an exemplary embodiment example 1 of the present application, as shown in fig. 1 to 3, a foundation structure for a guyed tower guy wire includes a first foundation portion 1 having a rectangular parallelepiped structure and a second foundation portion 2 having a square structure located at a center position of a top surface of the first foundation portion, the first foundation portion being configured to be disposed below a ground surface 3, a horizontal cross-sectional area of the second foundation portion being smaller than a top surface area of the first foundation portion, the top surface of the second foundation portion being configured to be disposed above the ground surface and configured to be connected to an end of a guyed wire, at least one screw anchor 4 being embedded in a bottom of the first foundation portion, the screw anchor being configured to be inserted into a soil body and to bear a pulling force.
The first foundation part and the second foundation part are both of reinforced concrete structures and are formed by one-time pouring, a reinforcement cage 5 is arranged in concrete, and the reinforcement cage is formed by binding main reinforcements 5-1 and stirrups 5-2.
The thickness of the first foundation part is preferably determined by combining geological conditions, construction methods and construction machinery, mechanized construction is preferably adopted, the ratio of the length to the thickness of the first foundation part is 2.5-5, in the embodiment, the length of the first foundation part is not less than 1000mm, the thickness of the first foundation part is not less than 300mm, and the height of the first foundation part is not less than 2000 mm.
The length of side of second basic unit is the same with the thickness of first basic unit, and the main muscle of second basic unit stretches into in the first basic unit, as the vertical atress reinforcing bar of first basic unit, has both guaranteed the connection reliability of second basic unit and first basic unit, has saved the material again.
When the foundation is used, the side face with the largest area of the first foundation part is perpendicular to the projection of the stay wire on the ground, namely perpendicular to a horizontal component force generated by the stay wire, soil bodies on two sides of the first foundation part can effectively limit the first foundation part to displace, the rigidity of the foundation in the stay wire direction is obviously improved, the side face with the largest area of the first foundation part is perpendicular to the projection of the stay wire on the ground, the stressed area of the soil body acting on the first foundation part is largest, and the effect of limiting the displacement of the foundation is best.
The first foundation portion is located inside the soil body, the horizontal cross-sectional area of the second foundation portion is smaller than the top surface area of the first foundation portion, and a part of the soil body can be pressed on the upper surface of the first foundation portion to bear a part of vertical drawing force.
Through the setting of first basis portion and second basis portion, the displacement at reduction basis top that can be very big improves the anti deformability and the reliability of basis.
The vertical beam of the spiral anchor is arranged according to the tension of the stay wire, the spiral anchor comprises a guide rod 4-1, a spiral anchor sheet 4-2 is arranged on the outer peripheral surface of the guide rod, a conical anchor head 4-3 is arranged at the bottom of the guide rod, and a plurality of ring plates 4-4 are welded and fixed on the outer peripheral surface of the upper portion of the guide rod, so that the anchoring force of the guide rod and the first foundation portion can be obviously improved. The screw anchor can be screwed into the soil body to bear the uplift force.
The depth of penetration of the bolt anchor is determined by design calculation, and the screw anchor can resist the vertical component of the stay wire.
The calculation method of the thickness, width, number of the upper ring plate of the guide rod and the anchoring length with the first base part should be verified according to a true model test, and will not be described in detail herein.
The top surface of second base portion is provided with steel sheet 6, steel sheet and the main muscle welded fastening in the second base portion, the thickness of steel sheet is not less than 10mm, the central point of steel sheet puts the welding and has lantern ring 7, the lantern ring can with 8 fixed connection of acting as go-between.
Example 2:
the embodiment discloses a guy wire fixing method for a guy wire tower, wherein one end of a guy wire is fixedly connected with a tower pole of the guy wire tower, and the other end of the guy wire is fixed by using the foundation structure of the embodiment, the method comprises the following specific steps:
step 1: and excavating the foundation pit to the bottom elevation of the first foundation part by adopting an excavator or manually excavating the foundation pit.
Step 2: the screw anchor is screwed to a set depth on the bottom surface of the foundation pit by using a construction machine, the set depth can be determined by calculation in advance, the construction machine can be the existing construction machine for the screw anchor, and the detailed description is omitted.
And step 3: and (3) cleaning broken stones at the bottom and the side surfaces of the foundation pit, ensuring that the construction surface is smooth, binding the reinforcement cages of the first foundation part and the second foundation part, and welding and fixing the steel plate and the top of the main reinforcement of the second foundation part.
And 4, step 4: the concrete is poured to form a first foundation portion and a second foundation portion, the first foundation portion and the second foundation portion are formed through one-time pouring, integrity of the first foundation portion and integrity of the second foundation portion are guaranteed, the top face of the first foundation portion is located below the ground, and the top face of the second foundation portion is located above the ground.
And 5: and backfilling the foundation pit until the foundation pit is backfilled to be level with the ground around the foundation pit, finishing the construction of the foundation structure, and fixing the end part of the stay wire on the lantern ring in the middle of the steel plate to finish the fixing of the stay wire.
The bracing wire is fixed by adopting the foundation structure of the embodiment, the excavation amount of the foundation pit is small, and the excavation amount of the foundation pit is 1.5m3Compared with a plate foundation and a hole digging foundation, the foundation structure of the embodiment has the characteristics of low manufacturing cost, convenience in construction and environmental friendliness. The foundation structure of the embodiment has extremely high application value to the guy wire foundation with the geological condition of the soil body, and is suitable for the guy wire foundation of an extra-high voltage or extra-high voltage power transmission tower.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (5)
1. A foundation structure for guy wires of a guy tower is characterized by comprising a first foundation part buried under the ground, wherein the first foundation part is of a cuboid structure, the largest area of the first foundation part is used for being perpendicular to the horizontal component force generated by the guy wires, at least one spiral anchor is embedded at the bottom of the first foundation part and comprises a guide rod, spiral anchor pieces are fixed on the outer peripheral surface of the guide rod, a conical anchor head is arranged at the bottom end of the guide rod, a plurality of ring plates are arranged at the upper part of the guide rod and used for enhancing the bonding strength with the first foundation part, a second foundation part is arranged on the top surface of the first foundation part, the horizontal cross-sectional area of the second foundation part is smaller than that of the top surface of the first foundation part, the top surface of the second foundation part is used for extending out of the ground and is connected with the end of the guy wires, and a main rib in the second foundation part extends into the first foundation part, a vertical stressed steel bar as a first base part; the second base part is of a cube structure, the side length of the second base part is equal to the thickness of the first base part, and the thickness of the first base part is the size of a vertical surface perpendicular to the largest area of the first base part along the horizontal direction;
the ratio of the length to the thickness of the first base part is 2.5-5;
the spiral anchor is provided with a plurality of spiral anchors, and the axial distance between two adjacent spiral anchors is larger than 4 times of the outer diameter of the guide rod of the spiral anchor.
2. The foundation structure for a guy wire of a guyed tower of claim 1, wherein said first foundation part and said second foundation part are of a one-time-cast reinforced concrete structure.
3. A substructure according to claim 1, characterized in that the top surface of said second foundation part is provided with steel plates to which collars are fixed for fixed connection with the guy wire ends.
4. A stay wire fixing method for a stay wire tower, characterized in that one end of the stay wire is fixedly connected with a tower pole, the other end of the stay wire is fixedly connected with the base structure for the stay wire tower of any one of claims 1 to 3, the first base part is buried under the ground, the top surface of the second base part is positioned above the ground and is fixedly connected with the stay wire, and the vertical plane of the stay wire is vertical to the side surface with the largest area of the first base part.
5. The guyed tower guyed fixing method of claim 4, which is characterized by comprising the following specific steps:
step 1: excavating a foundation pit for embedding the foundation structure for the guy of the guyed tower;
step 2: screwing a spiral anchor into the bottom surface of the foundation pit to a set depth;
and step 3: binding reinforcement cages of the first foundation part and the second foundation part in the foundation pit;
and 4, step 4: pouring concrete to form a first foundation part and a second foundation part, wherein the top surface of the first foundation part is positioned below the ground, and the top surface of the second foundation part is positioned above the ground;
and 5: and backfilling the foundation pit until the foundation pit is flush with the ground around the foundation pit, and fixing the stay wire on the top surface of the second foundation part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911107048.1A CN110805060B (en) | 2019-11-13 | 2019-11-13 | Base structure for stay wire of stay wire tower and stay wire fixing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911107048.1A CN110805060B (en) | 2019-11-13 | 2019-11-13 | Base structure for stay wire of stay wire tower and stay wire fixing method |
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| CN110805060A CN110805060A (en) | 2020-02-18 |
| CN110805060B true CN110805060B (en) | 2022-02-08 |
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| CN113739974B (en) * | 2021-08-11 | 2023-10-20 | 中国电建集团山东电力建设第一工程有限公司 | Tension-adjustable stay wire connector and all-steel stay wire tower stay wire foundation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691759A (en) * | 2009-09-04 | 2010-04-07 | 中国电力工程顾问集团东北电力设计院 | Construction method for digging composite environmental protection base of anchorage bar adding rock |
| CN202124863U (en) * | 2011-05-19 | 2012-01-25 | 中国电力科学研究院 | Screw anchor excavated composite foundation |
| CN202124862U (en) * | 2011-05-19 | 2012-01-25 | 中国电力科学研究院 | Spiral-anchor plate type composite foundation |
| CN104358272A (en) * | 2014-11-28 | 2015-02-18 | 中国电力工程顾问集团西北电力设计院有限公司 | Basic structure for extra-high-voltage single-column guyed tower V-shaped stayguys |
| CN104594375A (en) * | 2015-01-22 | 2015-05-06 | 朱大宇 | Rock ground foundation overhead power line pole tower and guy cable novel foundation and construction technology |
| CN205712101U (en) * | 2016-04-06 | 2016-11-23 | 中兴通讯股份有限公司 | A kind of guyed foundation of Guywire tower |
| JP2016205014A (en) * | 2015-04-24 | 2016-12-08 | 東京電力ホールディングス株式会社 | Branch line anchor and construction method of the same |
-
2019
- 2019-11-13 CN CN201911107048.1A patent/CN110805060B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691759A (en) * | 2009-09-04 | 2010-04-07 | 中国电力工程顾问集团东北电力设计院 | Construction method for digging composite environmental protection base of anchorage bar adding rock |
| CN202124863U (en) * | 2011-05-19 | 2012-01-25 | 中国电力科学研究院 | Screw anchor excavated composite foundation |
| CN202124862U (en) * | 2011-05-19 | 2012-01-25 | 中国电力科学研究院 | Spiral-anchor plate type composite foundation |
| CN104358272A (en) * | 2014-11-28 | 2015-02-18 | 中国电力工程顾问集团西北电力设计院有限公司 | Basic structure for extra-high-voltage single-column guyed tower V-shaped stayguys |
| CN104594375A (en) * | 2015-01-22 | 2015-05-06 | 朱大宇 | Rock ground foundation overhead power line pole tower and guy cable novel foundation and construction technology |
| JP2016205014A (en) * | 2015-04-24 | 2016-12-08 | 東京電力ホールディングス株式会社 | Branch line anchor and construction method of the same |
| CN205712101U (en) * | 2016-04-06 | 2016-11-23 | 中兴通讯股份有限公司 | A kind of guyed foundation of Guywire tower |
Non-Patent Citations (1)
| Title |
|---|
| "风电场架空电力线路杆塔拉线锚杆基础设计及试验";黄冬平;《建筑结构》;20190831;第140-142、54页 * |
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