JP2010024747A - Buckling reinforcement method for angle steel member and reinforcement implement used in the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buckling reinforcement method for an angle steel member which performs the buckling reinforcement of a member expected to cause the insufficiency of strength caused by a new load on the angle steel member for a steel tower or the like, makes a steel material serving as a reinforcing material and an installation space extremely small, and is excellent in workability. <P>SOLUTION: In the buckling reinforcement method for an angle steel member expected to cause the insufficiency of strength, inner and outer sides of a part to be reinforced of the angle steel member E are covered with inner contact pieces 2 and outer contact pieces 1, respectively, the inner contact pieces 2 support the buckling reinforcement plate 6, the buckling reinforcement plate 6 is radially projected from the inside corner of the member E by a predetermined length along the longitudinal direction, both edges of the outer contact piece 1 and the inner contact piece 2 covering the member E are projected outward from both edges of the member E, and projected parts are fixed with removable bolts 7 and nuts. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to buckling reinforcement of angle steel members used in existing steel towers such as power transmission towers and communication towers, and in particular, a buckling reinforcement method for a place where strength is expected to be insufficient, and The present invention relates to a reinforcing tool used in the method.

  In addition to power supply, many steel towers have been built nationwide for communications. In these steel towers, after being constructed, some members forming the steel tower are subjected to more load than originally assumed, and the members may be expected to have insufficient buckling tolerance.

For example, in the case of replacing an electric wire hung on a steel tower, a wire transfer operation may be required, and a large load is temporarily applied to the steel tower member on which the electric wire is suspended. As described above, when a load exceeding an allowable level is applied to the steel material forming the steel tower, the steel material is buckled, and a dangerous situation may be caused depending on the situation.
In order to prevent such buckling of the members of the steel tower T, for example, as shown in FIG. 14, another steel material is newly attached as the reinforcing material G to the member F which is expected to have insufficient buckling tolerance strength. The member F is supported and the buckling strength of the member F is reinforced.

  Moreover, as shown in FIG. 14, when removing a part of the existing foundation concrete H for reinforcement of the foundation part of the steel tower T, the member which forms the foundation part is temporarily exceeded the initial assumption of construction. The load may be applied. When part of the concrete H of the foundation part is removed in this way, since there is no method for reinforcing the member of the foundation part, the concrete H1 is removed only in a range where the foundation concrete H can be removed, and then remains. New concrete is placed on the existing foundation concrete H.

In addition, as described in Patent Document 1, the outside of a member portion where a buckling allowable yield strength is expected to be insufficient is surrounded and fixed by a cylindrical buckling restraining member having a certain length, and the restraining member and the member are fixed. There is a method in which the mortar is filled and solidified to increase the buckling strength of the member.
JP 2006-28902 A

  However, when a new reinforcing member is attached to a member where the buckling tolerance is expected to be insufficient, a space for attaching the reinforcing member is required, and the reinforcing member cannot be attached at a dense portion of the member. Sometimes. In this case, replacement with a new member satisfying the strength is required. However, when the member is replaced, more labor and time are required. In addition, if the steel materials that are members in contact with each other during these operations, some of the members may be lost, and if the members are lost, additional work will be added to restore or restore the current status. become.

  Further, in the work for removing the foundation concrete, the concrete can be removed only within the range in which the foundation concrete can be removed.

  Furthermore, in the method described above, a preliminary survey is required to confirm the detailed dimensions, and it is difficult to reuse a member once used as a temporary reinforcing material for other reinforcing purposes. .

  Moreover, in the thing of the said patent document 1, since it becomes a structure filled with mortar between a steel tower member and a buckling restraint member, it may be difficult to perform these work | work in the location where the members were densely packed in the steel tower. Yes, and many work days are required.

  The present invention has been made in view of these points, and in a buckling reinforcing method and a reinforcing tool for a member which is expected to have insufficient strength due to a new load applied to an angle steel member such as a steel tower, a reinforcing material is provided. The steel material and its mounting space are made extremely small, the member is not lost during work, and it can be used for reinforcement of the foundation part. A reinforcing tool used in the method is provided to solve the above problem.

  The invention according to claim 1 is a buckling reinforcement method for an angle steel member, which is expected to be insufficient in strength, by supporting a buckling reinforcement plate on an abutting member that covers the inner and outer surfaces of the reinforcement portion of the angle steel member, and The bending reinforcement plate is projected in a radial direction from the inner corner of the angle steel member and along the longitudinal direction of the angle steel member, and both side edges of each contact member covered on the angle steel member are the angle shape. A method of buckling reinforcement of the angle steel member that protrudes outward from both side edges of the steel member and is fixed with a detachable locking tool at the protruding portion.

  According to the invention of claim 2, in the buckling reinforcement of the angle steel member expected to be insufficient in strength, the outer abutting piece made of an angle member and the inner side surface are covered, covering the outer surface of the reinforcing portion of the angle steel member. An abutting member is constituted by an inner abutting piece made of an angle material, and a rib plate is provided adjacent to the inner abutting piece at regular intervals in the longitudinal direction and substantially perpendicular to the longitudinal direction of the inner abutting piece. A buckling reinforcing plate that protrudes radially from the inner corner of the inner abutting piece is provided between the rib plates, and each side edge of the outer abutting piece and the inner abutting piece of the abutting member is connected to the angle steel member. A buckling reinforcement tool for an angle steel member that protrudes outward from both side edges of the steel plate and that is fastened with nuts that are screwed into the bolt ends by inserting bolts into the holes provided at the protruding portions.

  The invention according to claim 3 is the buckling of the angle steel member according to claim 2, wherein the contact member is composed of a plurality of inner contact pieces and outer contact pieces separated each time the rib plate is provided. A reinforcing tool was used.

  According to a fourth aspect of the present invention, in the buckling reinforcement for an angle steel member expected to have insufficient strength, the outer abutting piece and the inner surface made of an angle material are covered, covering the outer surface of the reinforcing portion of the angle steel member. An abutting member is constituted by an inner abutting piece made of an angle member, and a buckling reinforcing plate that radiates from an inner corner portion of the inner abutting piece and projects a predetermined length along the longitudinal direction of the inner abutting piece. Provided, projecting the both side edges of the outer contact piece and the inner contact piece of the contact member outwardly from the both side edges of the angle steel member, and inserting bolts into the holes provided in the protrusions A buckling reinforcement of a chevron steel member fastened with a nut screwed to the bolt end.

  According to a fifth aspect of the present invention, the inner abutting piece is divided into two symmetrically from the center in the longitudinal direction of the buckling reinforcing plate, and the two divided buckling reinforcing plates are overlapped with each other by bolts and nuts. The angled steel member buckling reinforcement tool according to claim 4 is fixed.

  According to a sixth aspect of the present invention, the outer abutting piece is composed of angle members facing the two outer surfaces of the angle steel member, and has a protruding piece protruding outward from an outer corner of the angle steel member. 6. The method according to claim 2, wherein the projecting piece is bifurcated symmetrically from the longitudinal center portion, and the bifurcated projecting pieces are overlapped and fixed with bolts and nuts. The buckling reinforcement was used.

  According to the method of the invention of claim 1 and each of the inventions of claims 2 and 4, as reinforcement of a member expected to have insufficient strength of the existing tower, it is seated in a radial direction from the inner corner of the angle-shaped inner contact piece. Since the bending reinforcement plate is provided, structurally, the cross section of the angle steel member is strengthened, thereby increasing the buckling stress, which is highly reliable as a reinforcing method and as a reinforcing tool.

  In addition, because the outer contact piece and the inner contact piece of this reinforcing tool are directly attached to the inner and outer portions of the angle steel member that is expected to have insufficient strength such as an existing steel tower, etc. It does not require a large space or special tools, can be easily installed, and can be easily removed. Therefore, when the steel tower member is reinforced, it is possible to respond in detail and is highly convenient. Moreover, since it can be easily attached to a member, it can also be used to reinforce the foundation.

  According to the invention of claim 3, since a plurality of inner abutting pieces having rib plates and outer abutting pieces corresponding thereto are provided and these abutting members are provided at intervals, the reinforcing tool is lightweight. The material cost is reduced and the handling becomes convenient. According to the invention of claim 5, since the inner abutting piece having the buckling reinforcing plate is divided into two in the longitudinal direction, the inner abutting piece has a substantially sectional shape. Since it becomes a V-shaped member, the structure is simple and the manufacture becomes easy. Further, according to the invention of claim 6, the outer abutting piece is divided into two parts, the structure is simple and the manufacture is easy, and the protruding piece of each outer abutting piece protrudes from the outer corner of the angle steel member, The superposed projecting piece becomes a buckling reinforcing plate, the cross section of the angle steel member is enlarged, and the buckling stress is further increased.

  In a buckling reinforcement method for angle steel members that are expected to be insufficient in strength, a buckling reinforcement plate is supported by a contact member that covers the inner and outer surfaces of the reinforcement portion of the angle steel member, and the buckle reinforcement plate is attached to the angle steel member. The side edges of each abutment member covering the angle steel member are radially outward from the inner corner of the angle steel member and extending along the longitudinal direction of the angle steel member. It protrudes in the direction, and is fixed with a detachable locking tool at the protruding portion.

  As a result, a buckling reinforcement plate is provided in the radial direction from the inner corner of the angle-shaped inner contact piece as a reinforcement of a member that is expected to be insufficient in strength of the existing steel tower. The cross section is strengthened, which increases the buckling stress, and is a reliable method of reinforcement.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a state in which the reinforcing tool according to Embodiment 1 of the present invention is attached to a part of an angle steel member forming a steel tower. FIG. 2 is a side view of the same. FIG. 3 is a perspective view of an inner contact piece of the reinforcing tool. FIG. 4 is a perspective view of an outer contact piece of the reinforcing tool.

  The reinforcing tool A according to the first embodiment is formed of an outer contact piece 1 and an inner contact piece 2. As shown in FIG. 4, the outer abutment piece 1 has an angle shape with a right-angle cross section, is formed of a short shape, and has through-holes 3 near both side edges. Three of the contact pieces 2 are arranged at the same interval as the angle material 2a.

  As shown in FIG. 3, the inner abutment piece 2 has an angle shape similar to that of the outer abutment piece 1, and has a slightly shorter side on both sides than the outer abutment piece 1. A square rib plate 5 having two sides in contact with each other is attached along two sides on the inside of each angle member 2a. Three such angle members 2a are arranged at intervals, and a rectangular buckling reinforcement plate 6 is disposed between the rib plates 5 of each angle member 2a at a position in the radial direction of the inner corner portion of each angle member 2a. The inner contact piece 2 is formed by connecting the angle members 2a in a skewed manner.

  Each side of the outer contact piece 1 and the inner contact piece 2 formed in this manner protrudes from both side edges of the member when the reinforcing tool A is attached to a member of an equilateral mountain-shaped steel material described later. Thus, it is provided longer than each side of the member.

  Next, the reinforcing tool A of Example 1 is attached to a member that forms the main pillar material and is expected to be insufficient in strength in a steel tower constructed of right-angled equilateral mountain steel. Here, for the sake of explanation, only the member E to which the reinforcing tool A is attached will be described.

  First, the inner contact piece 2 is brought into contact with the inner side of the member E by projecting both side edges of the inner contact piece 2 from both side edges of the member E. Subsequently, the outer contact piece 1 is contacted to the outer surface of the member E at the same interval as the angle member 2a of the inner contact piece 2 on the outer side of the member E, and both sides of the outer contact piece 1 are placed. The edges are arranged in a state of protruding from both side edges of the member E.

Further, the outer abutment piece 1 and the inner abutment piece 2 are inserted with bolts 7 from the insides of the through holes 3 and 4 near the opposite side edges, and tightened with the nuts 8 from the outside to tighten the outer abutment piece 1. The material and the inner contact piece 2 are attached to the member E.
Thereby, the reinforcing tool A is attached to the member E, and in this member E, the cross-sectional area is increased and the buckling tolerance strength is greatly increased.

  FIG. 5 is a perspective view of an outer abutting piece of a reinforcing tool according to Embodiment 2 of the present invention. FIG. 6 is a perspective view of the inner contact piece. FIG. 7 is a perspective view of a state in which the reinforcing tool according to the second embodiment of the present invention is attached to a part of the angle steel member forming the steel tower. FIG. 8 is a side view of the same.

  Then, the reinforcing tool B of Example 2 is demonstrated. Also in the second embodiment, the reinforcing tool B is formed of the outer contact piece 9 and the inner contact piece 10. The outer abutment piece 9 is formed of two plates 12 each having a certain shape with an angle of 135 degrees in cross section and having a plurality of through holes 11 provided near both side edges. Then, one side surface of these two plate bodies 12 and 12 is overlapped with each other, the bolt 7 is passed through the through-hole 11, and tightened with a nut 8 to form an outer abutting piece 9 having a right-angle cross-sectional groove.

  The inner abutment piece 10 is a chevron shape having an angle of 45 degrees in cross section, has a certain length, and includes two plate bodies 14 provided with a plurality of through-holes 13 near both side edges and inner corner portions. Become. Then, one side surface of these two plate bodies 14, 14 is overlapped and tightened with a nut 8 through a bolt 7 through the through hole 13, thereby forming an inner abutting piece 10 whose outer surface is perpendicular.

  Further, each side of the outer shape of the outer contact piece 9 and the inner contact piece 10 formed in this way is attached to the member of an equal angle mountain steel material described later when the reinforcing tool B is attached to the member. It is provided longer than each side of the member so as to protrude from both side edges.

  Furthermore, this reinforcing tool B is attached to a member that forms a main pillar material that is expected to have insufficient strength in a steel tower constructed of a right-angled equilateral mountain-shaped steel material. Here, for the sake of explanation, only the member E to which the reinforcing tool is attached will be described.

  The side surfaces of the two plate bodies 12 forming the outer abutment piece 9 forming the right-angle cross-sectional grooves are formed so that both side edges of the plate bodies 12 protrude from the both side edges of the member E. It is made to contact | abut to two surfaces of the outer side of a part, respectively. Then, the outer side surfaces of the two plate bodies 14 forming the inner contact piece 10 are put on the inner side surface of the member E and overlapped. Accordingly, one side edge of each plate body 14 is protruded from both side edges of the member E.

Further, the bolt 7 is inserted from one of the through holes 11 and 13 near the opposite side edges of the outer member 9 and the inner contact piece 10 and is tightened with the nut 8 from the other to tighten the outer contact piece 9 and the inner contact piece 10. The contact piece 10 is attached to the member E (in FIG. 7 and FIG. 8, the description of the bolt 7 inserted into each through hole 13 near the inner corner of the inner contact piece 10 and the nut 8 screwed to the bolt 7 is provided. (Omitted).
Thereby, the reinforcing tool B is attached to the member E, and in this member E, the buckling allowable strength is greatly extended.

  Further, buckling strength tests of the reinforcing tools A and B of Examples 1 and 2 were performed. Here, in addition to the reinforcing tools A and B, as a comparative example, a test was performed on the reinforcing tool C shown in FIGS. 9 and 10.

Comparative example

  FIG. 9 is a perspective view showing a state in which the reinforcing tool of the comparative example in the embodiment of the present invention is attached to a part of the angle steel member forming the steel tower. FIG. 10 is a side view of the same.

  The configuration of the reinforcing tool C is composed only of the inner abutting piece 21 and is similar to the inner abutting piece 2 of the reinforcing tool A. The inner abutment piece 21 is smaller than the inner abutment piece 2 of the reinforcing tool A, is almost the same size as the inner surface of the member E, has a short angle shape, has a through hole 24 on two side surfaces, and an angle member 21a. A rectangular rib plate 22 having two sides in contact with each other is attached along two right end edges. Three such angle members 21a are arranged at intervals, and a rectangular buckling reinforcement plate 23 is disposed between the rib plates 22 of each angle member 21a at the position in the radial direction of the inner corner portion of each angle member 21a. The inner contact piece 21 is formed by connecting each angle member 21a in a skewed manner.

  Similar to the first and second embodiments, this reinforcing tool C is attached to a member that forms a main pillar material that is expected to be insufficient in strength in a steel tower constructed of a right-angled equilateral mountain steel. Here, for the sake of explanation, only the member E to which the reinforcing tool C is attached will be described.

  The reinforcing tool C is brought into contact with the inside of the member E. At this time, both side edges of the reinforcing tool C do not protrude from both side edges of the member E. And the position of the through-hole 24 of the said reinforcement tool C and the position of the through-hole 31 previously pierced in the member E are match | combined, the volt | bolt 7 is inserted from the inside of each of these through-holes 24 and 31, and it tightens with the nut 8 from the outside. The reinforcing tool C is attached to the member E.

Then, the following buckling strength tests were performed on the reinforcing tools A, B, and C.
As the contents of the test, the loading outline was measured on a rotating bearing that freely rotates around the angled steel section minimum axis (v-axis). The test machine used was a 3,000 kN compression test machine, and the load, displacement, and strain were measured as measurement items. In addition, as an outline of measurement, the output of the testing machine is measured as a load, and the displacement is measured by a displacement meter. In the case of a test body that does not use a reinforcing tool, the strain is not 3 sheets / cross section per section of the strain gauge. It confirmed after confirming that it was not a uniform structure. Moreover, the test body using the reinforcing tool was used after confirming the presence / absence of the stress of the reinforcing tool by using 4 pieces / cross section for one section of the strain gauge.

  Table 1 shows a list of buckling test specimens and test results as the test results. FIG. 11 shows a line graph showing the buckling strength-elongation ratio relationship, and FIG. 12 shows a bar graph showing the reinforcing effect based on the test results. The specimens to which the reinforcing tools A, B, and C are attached are L150 × 10, an elongated ratio (λ) of 40, a length of 1188 mm, an elongated ratio (λ) of 80, a length of 2376 mm, an elongated ratio (λ) of 100, and a length. Three types of 2970 mm were used. In Table 1, the reinforcement 1 represents the reinforcement A, the reinforcement 2 represents the reinforcement B, and the reinforcement 3 represents the reinforcement C.

  In this test, 12 specimens were tested. Specimen No. 2 in Table 1, FIG. 11 and FIG. 12 (hereinafter simply referred to as “No. 2”. Also, in FIG. 11 and FIG. 12 only indicated by numbers), No. 3 and No. Reinforcing tool A was attached to No. 7, No. 9 and No. 10, reinforcing tool B was attached to No. 4 and No. 11, and reinforcing tool C was attached to No. 5 and No. 12. No reinforcement was attached to the remaining No.1, No.6 and No.8.

  In addition, in FIG. 12, the reinforcing effect of No. 2, No. 3, No. 4 and No. 5 with λ = 40 is “bending torsional buckling” and the strength reduction is large. It also shows the case where the “AIJ Modify” evaluation is strength without reinforcement.

  As shown in Table 1 above, the reinforcement effect of each specimen (reinforcement in parentheses / AIJ-M) is 1.237 (1.056) for No.2, 1.267 (1.082) for No.3, and 1.246 for No.4. 1.064), No.5 is 1.155 (0.987), No.7 is 1.323 (1.363), No.9 is 1.295 (1.300), No.10 is 1.510 (1.515), No.11 is 2.106 (2.113), No. 12 was 1.074 (1.078).

  When No.2 and No.3 (elongation ratio λ = 40) with reinforcing tool A attached and the strength of the non-reinforced member is taken as the test result evaluation, the increase in the strength was about 25%, and the strength of the non-reinforced member was evaluated as AIJ modify evaluation. In the case, it was confirmed that the increase was 5% to 10%, and for No. 9 and No. 10 (elongation ratio λ = 100), the increase was 30% to 50%. And No.2, No.3, No.7, No.9 and No.10 with the reinforcing tool A attached are buckled in areas other than the reinforcing part when the slenderness ratio is small, showing a reliable reinforcing effect. When the slenderness ratio was large, the entire body was buckled, and a sufficient reinforcing effect was obtained from the stiffening effect.

  With No. 4 (elongation ratio λ = 40) attached with the reinforcement B, it has the same reinforcement effect as the reinforcement A, and with No. 11 (elongation ratio λ = 100), it has a reinforcement effect of 100% or more. It was confirmed that it had. Moreover, as a reason which showed the reinforcement effect exceeding the said reinforcement tool A by No. 11 (elongation ratio (lambda) = 100), while the reinforcement tool A showed the whole buckling (Euler buckling) property, In the reinforcing tool B, the stiffening effect of the reinforced portion was high, and it was estimated that the local buckling property of the non-reinforced portion was obtained instead of the overall buckling property. As described above, No. 4 and No. 11 with the reinforcing tool B attached were buckled at portions other than the reinforcing portion regardless of the slenderness ratio, and showed a large reinforcing effect in a region having a large slenderness ratio.

  With No. 5 (elongation ratio λ = 40) with the reinforcement tool C attached, if the strength of the non-reinforced member is evaluated as the test result, it is increased by 15%. If the strength of the non-reinforced member is evaluated as the AIJ modify evaluation, there is no reinforcing effect. In No. 12 (elongation ratio λ = 100), it increased by 7%, and it was confirmed that the reinforcing effect was smaller than that of the reinforcing tools A and B. And No. 5 and No. 12 became buckling between reinforcement attachment points. As described above, the reason why the reinforcing effect is small is that the reinforcing effect due to the stiffening effect of the reinforcing plate was expected, but the portion where the reinforcing member and the reinforcing tool C are joined has a cross-sectional shape only of angle iron + angle steel. It was estimated that the stiffening effect was reduced because the reinforcing plate was divided.

FIG. 13 shows a reinforcing member strength calculation result-test result relationship.
The strength evaluation of the reinforcing member was set to the minimum value of the strength determining factors of the non-reinforcing member buckling strength, the overall buckling strength (Euler buckling strength), and the buckling between the reinforcing material attachment points (only the reinforcing tool C). . As shown in FIG. 13, the numerical values of the reinforcing member strength calculation results and test results in No. 2 to No. 5, No. 7, and No. 9 to No. 12 of this time are almost the same. It was confirmed that the strength evaluation of the reinforcing member based on the test results was generally appropriate. Further, the reinforcing effect could be evaluated by comparing the reinforcing member strength calculation result and the single material strength.

  In the first and second embodiments, the configurations are specifically described as the reinforcing tools A and B. However, the reinforcing tools are not limited to these configurations, and the configurations described in the claims of the present application are used. Of course, other configurations are acceptable as long as they are satisfactory.

  In the first embodiment, the outer abutment piece 1 of the reinforcing tool A is formed from a plurality of short ones. However, the outer abutment piece 1 may be formed of one angle member having a fixed length. In addition, the outer abutting piece 9 of the second embodiment is formed from a plate body 12 having a mountain shape and a fixed length. However, the plate body 12 may be formed from a plurality of short members. Although it is formed from two plate bodies having a constant shape and a chevron shape having an angle of 45 degrees in cross section, they may be formed by previously integrating them. Further, in these outer contact piece and inner contact piece, the outer contact piece 1 and inner contact piece 2 of the reinforcing tool A, and the outer contact piece 9 and inner contact piece 10 of the reinforcing tool B. Of course, each outer contact piece and each inner contact piece may be used in combination.

  Moreover, in said 1 and 2, although the volt | bolt and the nut are used, other detachable latches may be used. Furthermore, although the reinforcing tools A and B of Examples 1 and 2 are used as members of the main pillar material of the steel tower, they can of course be used not only for the main pillar material but also for the auxiliary material. It can be used not only for steel tower members but also for angle steel members of other structures.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the state which attached the reinforcement tool of Example 1 of this invention to the one part member of the angle steel member which forms a steel tower. It is a side view of the state which attached the reinforcement tool of Example 1 of this invention to the one part member of the angle iron member which forms a steel tower. It is a perspective view of the inner side contact piece of the reinforcement tool of Example 1 of this invention. It is a perspective view of the outer side contact piece of the reinforcement tool of Example 1 of this invention. It is a perspective view of the outer side contact piece of the reinforcement tool of Example 2 of this invention. It is a perspective view of the inner side contact piece of the reinforcing tool of Example 2 of this invention. It is a perspective view of the state which attached the reinforcing tool of Example 2 of this invention to the one part member of the angle steel member which forms a steel tower. It is a side view of the state which attached the reinforcement tool of Example 2 of this invention to the one part member of the angle iron member which forms a steel tower. It is a perspective view of the state which attached the reinforcing tool of the comparative example in the Example of this invention to the one part member of the angle steel member which forms a steel tower. It is a side view of the state which attached the reinforcing tool of the comparative example in the Example of this invention to the one part member of the angle steel member which forms a steel tower. It is a line graph which shows the buckling strength-elongation ratio relationship in the Example of this invention. It is a bar graph which shows the test effect based on the test result in the Example of this invention. It is a graph which shows the reinforcement member intensity | strength calculation result-test result relationship based on the test result in the Example of this invention. In a conventional steel tower made of angle steel members, a state in which another steel material is newly attached as a reinforcing material to a member expected to have insufficient strength to support the member, and the strength of the member is reinforced, and the foundation of the steel tower It is explanatory drawing which shows the range which can remove the foundation concrete in the case of removing some existing foundation concrete H for reinforcement of a part.

Explanation of symbols

A Reinforcing tool B Reinforcing tool C Reinforcing tool
E member 1 outer contact piece 2 inner contact piece 3 through hole 4 through hole 5 rib plate 6 buckling reinforcement plate 7 bolt 8 nut 9 outer contact piece 10 inner contact piece 11 through hole 12 plate body 13 through hole 14 Plate body 21 Inside contact piece 22 Rib plate 23 Buckling reinforcement plate 24 Through hole 31 Through hole

Claims (6)

In the buckling reinforcement method for angle steel members that are expected to lack strength,
The buckling reinforcement plate is supported by the abutting member that covers the inner and outer surfaces of the reinforcing portion of the angle steel member, and the buckling reinforcement plate is in the radial direction from the inner corner of the angle steel member and is the longitudinal direction of the angle steel member. Protruding a certain length along the direction,
The both side edges of each abutting member covered on the angle steel member are protruded outward from the both side edges of the angle steel member, respectively, and fixed with a detachable locking tool at the protruding portion, A buckling reinforcement method for angle steel members. In buckling reinforcement for angle steel members that are expected to lack strength,
An abutting member is constituted by an outer abutting piece made of an angle material and an inner abutting piece made of an angle material covering an inner surface, covering the outer surface of the reinforcing portion of the angle steel member,
A rib plate is provided inside the inner contact piece at regular intervals in the longitudinal direction and substantially perpendicular to the longitudinal direction of the inner contact piece, and radially between the adjacent rib plates from the inner corner of the inner contact piece. A buckling reinforcing plate protruding in the direction is provided, and both side edges of the outer contact piece and the inner contact piece of the contact member are protruded outward from both side edges of the angle steel member, and are provided at the protruding portion. In addition, a bolt is inserted into each of the holes and fixed with a nut screwed to the end of the bolt. Buckling reinforcement for angle steel members. The buckling reinforcement of the angle steel member according to claim 2, wherein the abutting member includes a plurality of inner abutting pieces and outer abutting pieces separated each time the rib plate is provided. Ingredients. In buckling reinforcement for angle steel members that are expected to lack strength,
An abutting member is constituted by an outer abutting piece made of an angle material and an inner abutting piece made of an angle material covering an inner surface, covering the outer surface of the reinforcing portion of the angle steel member,
Provided are buckling reinforcement plates that radiate from the inner corners of the inner contact piece and project a fixed length along the longitudinal direction of the inner contact piece. The outer contact piece and the inner contact piece of the contact member The both side edges of the angle steel member are protruded outward from the both side edges of the angle steel member, and bolts are inserted into the holes provided in the protruding portions and are fastened with nuts screwed to the bolt ends. Buckling reinforcement for angle steel members. The inner contact piece is bifurcated symmetrically from the longitudinal center of the buckling reinforcement plate, and the bifurcated buckling reinforcement plates are overlapped and fixed with bolts and nuts. The buckling reinforcement tool of the angle steel member according to claim 4. The outer abutting piece is composed of a chevron member facing two outer surfaces of the chevron steel member, and has a projecting piece projecting outward from an outer corner of the chevron steel member, and the longitudinal direction of the projecting piece 6. The method according to any one of claims 2, 3, 4 and 5, characterized in that it is divided into two symmetrically from the central part of each of the two, and the two divided projecting pieces are overlapped and fixed with bolts and nuts. Buckling reinforcement.

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