CN112482862A - Compressive reinforcement device for power transmission tower member based on single arc plate steel pipe and manufacturing method thereof - Google Patents
Compressive reinforcement device for power transmission tower member based on single arc plate steel pipe and manufacturing method thereof Download PDFInfo
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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
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
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- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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Abstract
The invention provides a single arc plate steel pipe-based compression-resistant reinforcing device for a power transmission tower member and a manufacturing method thereof, and the device is characterized by comprising the following steps: a single circular arc plate and a plurality of clamps; the single arc plate is tightly attached to the outer surface of the steel pipe tower rod piece to be reinforced and is fixedly connected with the steel pipe tower rod piece through a plurality of clamps arranged at equal intervals; the clamp consists of a U-shaped bolt and a supporting base. The method can reinforce the compression resistance of key components of the built steel pipe iron tower and improve the safety of the iron tower on the premise of not damaging the section and the material performance of the main material of the original iron tower. The method has clear calculation principle and simple preparation method, and has wide application value in the field of disaster prevention and reduction of the power transmission line.
Description
Technical Field
The invention belongs to the technical field of disaster prevention and reduction of power transmission lines, and particularly relates to a single-arc-plate-based steel pipe power transmission tower member compression-resistant reinforcing device and a manufacturing method thereof.
Background
Most of the existing common iron tower compression-resistant reinforcement measures utilize connection modes such as bolt hole opening, welding, gluing and the like to add an auxiliary main material on the basis of the original tower material, so that the component and the overall compression-resistant stability of the power transmission iron tower are increased, but the bolt hole opening and welding can influence and even reduce the material performance of the original tower material, and the influence of the reinforcement measures on the overall safety is difficult to evaluate; the gluing connection has a durability problem in the complex outdoor environment of the power transmission tower, and the practical application effect of the corresponding iron tower reinforcing device is influenced.
Disclosure of Invention
Aiming at the defects and shortcomings of the existing scheme, the compressive reinforcement device for the power transmission tower member based on the single arc plate steel pipe and the manufacturing method thereof can reinforce the compressive capacity of the key member of the built steel pipe tower without damaging the section and material performance of the main material of the original tower, and improve the safety of the tower.
The technical scheme is as follows:
the utility model provides a based on monolithic circular arc board steel pipe power transmission tower component resistance to compression reinforcing apparatus which characterized in that includes: a single circular arc plate and a plurality of clamps; the single arc plate is tightly attached to the outer surface of the steel pipe tower rod piece to be reinforced and is fixedly connected with the steel pipe tower rod piece through a plurality of clamps arranged at equal intervals; the clamp consists of a U-shaped bolt and a supporting base.
Preferably, the circle center of the single circular arc plate coincides with the circle center of the steel pipe component to be reinforced, and the radius of the inner surface of the single circular arc plate is the same as the radius of the outer surface of the steel pipe tower rod component to be reinforced.
Preferably, the U-shaped bolt is sleeved outside the single arc plate and the steel pipe member to be reinforced, and the single arc plate and the steel pipe tower member to be reinforced are tightly fixed by being connected with the supporting base.
Preferably, the connecting part of the U-shaped bolt and the supporting base is provided with a lock nut or a lock washer.
Preferably, the steel type and the minimum thickness of the support base are larger than those of the steel pipe tower rod piece to be reinforced.
Preferably, the supporting base is of a splayed ladder structure, and a gasket is arranged between the supporting base and the steel pipe component to be reinforced.
According to the manufacturing method of the compressive reinforcement device based on the single arc plate steel pipe power transmission tower member, the method is characterized by comprising the following steps of:
step S1, carrying out vibration response analysis on the steel tube power transmission tower through finite element simulation, and determining the maximum pressed rod piece of the steel tube tower;
step S2, determining the actual compression increase amplitude delta F of the maximum compressed rod piece of the steel tube tower according to the comparison between the analyzed stress condition of the rod piece and the stress under the original design working condition;
step S3: and determining the parameter value of the pressure-resistant reinforcing device according to the value of the delta F.
Preferably, step S3 specifically includes the following processes:
the whole pressure resistance improving value of the reinforced steel pipe member is determined by the following formula:
Fs＝e×η×S×σc (1)
in the formula, e is an empirical coefficient; fsThe integral pressure resistance lifting value of the reinforced member is obtained; eta is a resistance coefficient; s is the sectional area of the reinforced single arc plate;
σcfor critical stress, it is calculated as follows:
in the formula, σyThe yield stress of the single arc plate;
alpha is a dimensionless length correction coefficient and is determined according to the following formula:
in the formula IeIs the rod member effective length coefficient; l is the length of a single arc plate; r and E are respectively the minimum radius and the elastic modulus of the single arc plate;
combining the size of delta F, selecting l, S and sigma of a single circular arc plateyAnd E parameter, determining the size and material characteristics of the single arc plate, so that the whole compressive capacity of the reinforced rod piece is improved by FsGreater than deltaf.
The reinforcing device provided by the invention and the preferred scheme thereof adopts a single circular arc plate to be tightly attached to the outer surface of the steel pipe tower rod piece to be reinforced, and is fixedly connected with the steel pipe tower rod piece through a plurality of clamps arranged at equal intervals. The method can reinforce the compression resistance of key components of the built steel pipe iron tower and improve the safety of the iron tower on the premise of not damaging the cross section and the material performance of the main material of the original iron tower. The method has clear calculation principle and simple preparation method, and has wide application value in the field of disaster prevention and reduction of the power transmission line.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic side view of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of embodiment A-A of the present invention;
in the figure: 1-single arc plate; 2-clamping; 3-U-shaped bolts; 4-supporting the base; 5-a gasket; 6-reinforcing steel tube tower rod pieces.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
as shown in fig. 1 and fig. 2, the scheme of the compressive reinforcement device for a steel pipe power transmission tower member based on a single circular arc plate 1 provided in this embodiment includes: the method comprises the following steps: a single arc plate 1 and a plurality of clamps 2; the single arc plate 1 is closely attached to the outer surface of a steel pipe tower rod piece 6 to be reinforced and is fixedly connected with the steel pipe tower rod piece through a plurality of clamps 2 arranged at equal intervals; the clamp 2 consists of a U-bolt and a support base 4.
In this embodiment, the steel pipe member to be reinforced is cylindrical. The circle center of the single arc plate 1 is superposed with the circle center of the steel pipe component to be reinforced, and the radius of the inner surface of the single arc plate 1 is the same as that of the outer surface of the steel pipe tower rod 6 to be reinforced. The U-shaped bolt is sleeved outside the single arc plate 1 and the steel pipe member to be reinforced and is connected with the supporting base 4 to tightly fix the single arc plate 1 and the steel pipe tower rod member 6 to be reinforced.
In this embodiment, a lock nut or a lock washer 5 is disposed at a connection portion between the U-bolt 3 and the support base 4. If the member is located within 15m from the ground, corresponding anti-theft measures, such as additional lock catch and other structures, should be taken. The steel type and the minimum thickness of the supporting base 4 are larger than those of the steel pipe tower rod piece 6 to be reinforced.
In this embodiment, the supporting base 4 is a splayed ladder structure, which ensures sufficient friction to ensure the reliability of fixing, and a spacer 5 is provided between the supporting base 4 and the steel pipe member to be reinforced, thereby preventing the steel pipe member from being damaged due to the extrusion of the supporting base 4.
The specific parameters and the type selection of the device provided by the above embodiment can be completed by the following steps:
step S1: carrying out vibration response analysis on the steel tube power transmission tower by a finite element simulation technology, and determining a maximum rod piece under pressure of the steel tube tower;
step S2: comparing the stress condition of the rod piece analyzed with the stress under the original design working condition, and determining the actual compression increase amplitude delta F of the rod piece;
step S3: and determining the values of parameters such as the sectional area, the material and the like of the compression-resistant reinforcing device according to the value of delta F.
Wherein, step S3 specifically includes the following processes:
the whole pressure resistance improving value of the reinforced steel pipe member is determined by the following formula:
Fs＝e×η×S×σc (1)
in the formula, e is an empirical coefficient; fsThe integral pressure resistance lifting value (N) of the reinforced member is obtained; eta is a resistance coefficient; s is the sectional area (mm) of the reinforced single circular arc plate 12)。
σcCritical stress (MPa) is calculated as follows:
in the formula, σyThe yield stress (MPa) of the single arc plate 1.
Alpha is a dimensionless length correction coefficient and is determined according to the following formula:
in the formula IeIs the rod member effective length coefficient; l is the length (mm) of the single arc plate 1; and r and E are respectively the minimum radius (mm) and the elastic modulus (MPa) of the single arc plate 1.
Combining the size of delta F, and reasonably selecting l, S and sigma of the single arc plate 1yE and the like, determining the size and the material characteristics of the single arc plate 1, so that the whole compressive capacity of the reinforced rod piece is improved by a value FsGreater than deltaF to achieve the purpose of compression resistance and reinforcement.
Based on the above solution, the present embodiment further provides a design example to facilitate those skilled in the art to better understand the solution of the present invention:
and respectively carrying out vibration response analysis of the steel pipe power transmission tower under the actual condition and the design working condition through finite element simulation calculation, and determining the rod piece pressure increase amplitude delta F under the actual condition. For example, for a tower leg bar (tube1), the length is 700mm, and Δ F is 15 kN.
The single arc plate 1 is tightly attached to the outer surface of the steel pipe tower rod 6 to be reinforced, the length l is 650mm, the elastic modulus E is 200000MPa, and the material yield strength sigma isy439MPa and a cross-sectional area S of 220mm2The minimum radius r is 6 mm. The single arc plate 1 is fixedly connected with the steel pipe tower rod piece through a plurality of clamps 2 which are arranged at equal intervals, and the distance between the clamps 2 is 100 mm.
The circle center of the single arc plate 1 is superposed with the circle center of the steel pipe component to be reinforced, and the radius of the inner surface of the single arc plate is the same as that of the outer surface of the steel pipe component to be reinforced, so that the single arc plate is tightly attached to the rod component to be reinforced, and the contact is good. The length of each circular arc thick plate 1 is equal, and the distance between the edge of the length direction and the rod end of the steel pipe member to be reinforced is 25 mm.
The clamp 2 consists of a U-shaped bolt 3 and a supporting base 4, the U-shaped bolt 3 is sleeved outside the single arc plate 1 and the steel pipe member to be reinforced, and the single arc plate 1 and the steel pipe member to be reinforced are tightly fixed by being connected with the supporting base 4.
With the above reinforcement arrangement, for tube1 rodThe resistance coefficient eta of the member is 0.85, and the effective length coefficient l of the member bareTaking 0.5 as the length correction factor alpha, the length correction factor can be determined according to the following formula,
then, the critical stress σcIn order to realize the purpose,
this can increase the compressive strength of the reinforced tube1 rod by the value,
Fs＝0.3×η×S×σc＝0.3×0.85×220×347.4＝19.5(kN)
by comparison, Fs＝19.5kN>Δ F ═ 15 kN. The pressure-resistant reinforcing device meets the requirements.
The present invention is not limited to the above-mentioned preferred embodiments, and any person can derive other various types of compressive reinforcement devices based on single-piece circular arc plate steel pipe power transmission tower members and manufacturing methods thereof according to the teaching of the present invention.
Claims (8)
1. The utility model provides a based on monolithic circular arc board steel pipe power transmission tower component resistance to compression reinforcing apparatus which characterized in that includes: a single circular arc plate and a plurality of clamps; the single arc plate is tightly attached to the outer surface of the steel pipe tower rod piece to be reinforced and is fixedly connected with the steel pipe tower rod piece through a plurality of clamps arranged at equal intervals; the clamp consists of a U-shaped bolt and a supporting base.
2. The compressive reinforcement device based on the single circular arc plate steel pipe power transmission tower member according to claim 1, is characterized in that: the circle center of the single arc plate is superposed with the circle center of the steel pipe component to be reinforced, and the radius of the inner surface of the single arc plate is the same as that of the outer surface of the steel pipe tower rod component to be reinforced.
3. The compressive reinforcement device based on the single circular arc plate steel pipe power transmission tower member according to claim 1, is characterized in that: the U-shaped bolt is sleeved outside the single arc plate and the steel pipe member to be reinforced and is connected with the supporting base to tightly fix the single arc plate and the steel pipe tower member to be reinforced.
4. The compressive reinforcement device based on the single circular arc plate steel pipe power transmission tower member according to claim 1, is characterized in that: and a check nut or a check gasket is arranged at the connecting part of the U-shaped bolt and the supporting base.
5. The compressive reinforcement device based on the single circular arc plate steel pipe power transmission tower member according to claim 1, is characterized in that: the steel type and the minimum thickness of the support base are larger than those of the steel pipe tower rod piece to be reinforced.
6. The compressive reinforcement device based on the single circular arc plate steel pipe power transmission tower member according to claim 1, is characterized in that: the supporting base is of a splayed ladder structure, and a gasket is arranged between the supporting base and the steel pipe component to be reinforced.
7. The manufacturing method of the compressive reinforcement device based on the single circular arc plate steel pipe power transmission tower member according to claim 1, is characterized by comprising the following steps:
step S1, carrying out vibration response analysis on the steel tube power transmission tower through finite element simulation, and determining the maximum pressed rod piece of the steel tube tower;
step S2, determining the actual compression increase amplitude delta F of the maximum compressed rod piece of the steel tube tower according to the comparison between the analyzed stress condition of the rod piece and the stress under the original design working condition;
step S3: and determining the parameter value of the pressure-resistant reinforcing device according to the value of the delta F.
8. The manufacturing method of the compressive reinforcement device based on the single circular arc plate steel pipe power transmission tower member according to claim 7, wherein the manufacturing method comprises the following steps:
step S3 specifically includes the following processes:
the whole pressure resistance improving value of the reinforced steel pipe member is determined by the following formula:
Fs＝e×η×S×σc (1)
in the formula, e is an empirical coefficient; fsThe integral pressure resistance lifting value of the reinforced member is obtained; eta is a resistance coefficient; s is the sectional area of the reinforced single arc plate;
σcfor critical stress, it is calculated as follows:
in the formula, σyThe yield stress of the single arc plate;
alpha is a dimensionless length correction coefficient and is determined according to the following formula:
in the formula IeIs the rod member effective length coefficient; l is the length of a single arc plate; r and E are respectively the minimum radius and the elastic modulus of the single arc plate;
combining the size of delta F, selecting l, S and sigma of a single circular arc plateyAnd E parameter, determining the size and material characteristics of the single arc plate, so that the whole compressive capacity of the reinforced rod piece is improved by FsGreater than deltaf.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809693A (en) * | 2022-03-21 | 2022-07-29 | 重庆科技学院 | High-load self-restraint reinforcing device for existing reinforced concrete column |
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Cited By (1)
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| CN114809693A (en) * | 2022-03-21 | 2022-07-29 | 重庆科技学院 | High-load self-restraint reinforcing device for existing reinforced concrete column |
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