JP2001065202A - Structure of column base and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of column base excellent in durability to be used for various poles of an indication pillar, electric-pole, or the like, iron towers, buildings, bridges, etc., and the construction method thereof. SOLUTION: A structure of column base having a base plate 2 for bolt connection at the lower end of the column base is provided with an upper column base member and a lower column base member 1b, and the lower column base member 1b is continuously provided to the base plate 2 for bolt connection to form the bottom part of a hollow pipe whose inside diameter is larger than the outside diameter of the lower end of the upper column base member, and the prescribed length of the lower end part of the upper column base member is inserted into the inside of the lower column base member 1b, and a castable hardener 3 is filled between the inside surface of the hollow pipe of the lower column base member 1b and the outer surface of the lower inserting part of the upper column base member to integrally combine the lower column base member 1b and the upper column base member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base structure used for various poles such as display poles, telephone poles, overhead poles, signal poles, lighting poles, signposts, portal poles, steel towers, buildings, bridges and the like. And a method of constructing the column base structure.

[0002]

2. Description of the Related Art Conventionally, there are the following types of column base structures having a base plate for bolt connection at the lower end of the column base. It has the simplest connection structure in which a base plate for connecting a foundation bolt is welded to the lower end of a column base of a steel pipe or section steel. However, in this case, the local bending of the base plate caused by the bolt reaction acts as a cumulative sectional force on the welded portion between the lower end of the column base on which the largest sectional force acts and the base plate for bolt connection, resulting in a structural weak point. The weak point of this structure is that it is possible to increase the thickness of the column base steel pipe and base plate to reduce the generated stress of the structure itself and relieve the stress of the welded part. This only leads to worsening costs and higher costs.

Therefore, as described later, limited reinforcement near the welded joint between the column base and the base plate is performed as described below, and the local bending of the welded portion can be reduced with a minimum increase in steel weight. An increase in the manufacturing cost is inevitable due to an increase in the degree of welding at the lower part of the leg structure. In addition, although the processing of the column base structure is limited to the welding connection with the base plate at the lower end of the column base, the upper column base member without processing is subject to handling by a fabricator, and Had become expensive. Furthermore, there is a problem that it is necessary to perform high-precision height correction and inclination correction with a mortar or the like between the base plate for bolt connection at the lower end of the column base and the foundation concrete.

[0004] Those having a base plate for bolt connection whose bottom end is reinforced thick. In this case, by increasing the thickness of an arbitrary range at the lower end of the column base made of a steel pipe or a section steel, the local bending stress of the welded portion from the base plate is reduced. However, the attachment of thick members at the lower end of the column pedestal increases the welding heat input and the stress concentration at the welded part of the plate thickness changing part due to the addition of a new welded part, the stress concentration at the part where the plate thickness suddenly changes, and the problem of weldability. However, there are also problems such as an increase in reliability unreliable points and an increase in welding cost. In particular, there is a limit to the thickness of a steel pipe or a shape steel, and in many cases, it is necessary to deal with costly cast steel or a welded built-up thick plate member. Furthermore, in the case of a steel pipe structure in which the column-base structure has a closed cross section, the joint between the steel pipe and the base plate cannot be welded or inspected from the inside, so that there is a limit in quality reliability and quality assurance.

One having a base plate for bolt connection reinforced with vertical ribs at a lower end of a column base. This is the simplest and most widely used low cost column base lower end reinforcement, as shown in FIG. However, there has been a problem that the weld heat residual stress at the upper end of the vertical rib and the heat-affected member quality at the weld toe overlap with each other to easily cause structural defects, resulting in a decrease in proof stress and fatigue performance. Furthermore, when anti-corrosion treatment such as hot-dip zinc plating was applied, the heat residual stress at the upper end of the vertical ribs was further increased due to heat input from the hot-dip zinc bath, and cracks developed from this, causing column base fatigue breakage. .

[0006] A base plate having a double flange for bolt connection reinforced with vertical ribs at a lower end of a column base. In this case, if the vertical rib is sandwiched between the upper and lower double flanges, the rigidity of the bolt joint flange is improved and the residual stress at the upper end of the vertical rib is reduced, so that the above-mentioned problem can be solved. However, there has been a problem that the structure of the lower end of the column base is complicated and the processing cost is significantly increased.

[0007] In any of the above cases, a common problem is that the column base structure is generally attached to the lower end of the column base in resonance with an earthquake, wind, or vibration from a structure supporting the column base. In many cases, a large load is applied, and there are cases where sufficient mechanical strength and durability cannot be maintained only by measures for improving the load-bearing capacity and fatigue performance of the lower end of the column base.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is constituted by a column base member made of a shape steel or a steel pipe which hardly undergoes secondary processing. Can greatly reduce costs by reducing the stress concentration, can greatly increase mechanical strength and durability, and can maintain a high quality level with reliable quality control It has been completed for the purpose of providing a column base structure that can be constructed, and a method for constructing a column base structure that can easily construct such a column base structure.

[0009]

According to the present invention, there is provided a column base structure having a base plate for bolt connection at a lower end of a column base, the column base structure comprising an upper column base member and a lower column base member. The lower pedestal member is formed by connecting a base plate for bolt connection to the bottom of a hollow tube having a diameter larger than the outer diameter of the lower end of the upper pedestal member. A predetermined length, filling an irregular hardening material between the inner surface of the hollow tube of the lower column base member and the outer surface of the lower end insertion portion of the upper column base member, the lower column base member and the upper column base member, And a column base structure having a base plate for bolt connection at the lower end of the column base, the upper column base member and the lower column base member, and the lower column base member is For bolt connection to the bottom of a hollow tube larger in diameter than the lower end outer diameter of the upper column base member As those provided continuously to Supureto After rigidly connected to the basis through which the anchor bolt,
A lower end of the upper column base member is inserted into the hollow tube portion of the lower column base member for a predetermined length, and then irregular hardening is performed between the inner surface of the hollow tube of the lower column base member and the outer surface of the lower column base member lower end insertion portion. A method of constructing a column base structure, characterized in that a material is filled and the lower column base member and the upper column base member are joined and integrated.

The lower column base member is made of cast steel and the hollow tube and the base plate are integrally formed, and the upper column base member and the lower column base member are made of different materials. The following shall be the invention according to claim 3.
The invention according to claim 4, wherein at least one of the upper column base member and the lower column base member is made of a surface-treated metal member, the inner surface of the hollow tube of the lower column member and the outer surface of the lower end insertion portion of the upper column member. The projection according to claim 5 is formed on at least one of them. Furthermore, the invention according to claim 6 is characterized in that the amorphous hardening material is made of a viscoelastic body.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. The drawings show a case where the present invention is applied to a display column installed on a highway. In the drawings, reference numeral 1 denotes a column base, and 2 denotes a bolt joining base plate attached to a lower end thereof. The pedestal 1 comprises an upper pedestal member 1a and a lower pedestal member 1b. The lower pedestal member 1b is bolted to the bottom of a hollow tube having a diameter larger than the outer diameter of the lower end of the upper pedestal member 1a. The joining base plate 2 is provided continuously. The lower end portion of the upper column base member 1a is inserted into the lower column base member 1b by a length substantially corresponding to the diameter, and the inner surface of the hollow tube of the lower column base member 1b and the upper column base member are further inserted. An amorphous hardening material 3 such as an organic epoxy or an inorganic cement mortar is filled between the lower end insertion portion and the outer surface of the lower end insertion portion of 1a, and the lower column base member 1b and the upper column base member 1a are joined and integrated. It has a structure.

The upper column base member 1a is long but hardly processed, and can cut an inexpensive steel pipe manufactured by an iron maker to a required size. It is just enough to attach the top cover. Note that the upper column base member 1a does not need to be limited to a steel pipe, and may have a column base structure made of a shape steel or a non-ferrous material. Also,
As a countermeasure against corrosion, a case using a steel pipe made of a weather-resistant steel material, painting or plating may be used, and hot-dip galvanizing is generally used for display columns and lighting on roads and the like from the viewpoint of landscape and maintenance. Furthermore, since the connecting portion of the insertion connecting portion with the lower column base member 1b via the irregularly shaped hardening material 3 is a contact portion of a different material with zinc plating, a guard layer such as tar epo is used to prevent elution and wear of zinc. May be provided.

The lower column base member 1b has a steel pipe portion serving as an insertion joint end of the upper column base member 1a and a base plate 2 for anchor bolt connection, and further, as shown in FIG. It is composed of ribs 4. As the anti-corrosion measures, a specification similar to that of the upper column base member 1a may be used. However, the lower column base member 1b often has a more severe corrosive environment than the upper column base member 1a, and there is a case where the corrosion prevention specification is higher. In addition, the lower column base member 1b is short, but has a high workability and a large number of welds.
As shown in the above, it is preferable to integrally mold with cast steel because the quality is stable and the cost is low. In this case, the lower column base member 1b can be integrally cast, including the hollow tube, the base plate 2, and even the vertical ribs 4, so that the plate thickness and the shape flexibility, which are free from welding problems, are high. Quality products can be manufactured.

As the irregular hardening material 3 to be filled between the inner surface of the hollow tube of the lower column base member 1b and the outer surface of the lower end insertion portion of the upper column base member 1a, for example, epoxy or cement mortar having viscoelasticity is used. Used. In addition, there is a combination of a vibration damping rubber, which is a standard material, and an irregular adhesive such as an epoxy resin. As a result, in a column base structure to which a vibration load is applied, the seismic isolation (absorption response of vibration acceleration) / vibration suppression (absorption damping of vibration energy) is exerted to reduce the vibration load acting on the column base structure. And the durability can be greatly improved.

In this case, as shown in FIG. 5 and FIG. 6, the inner surface of the hollow tube of the lower column base member 1b and the upper column base member 1a
It is preferable to form a shaky projection 5 on at least one of the outer surfaces of the lower end insertion portion because the connection strength of the insertion connection portion of the lower column base member 1b via the irregularly shaped hardening material 3 is enhanced.

Further, the upper column base member 1a and the lower column base member 1b may be made of different kinds of members. The reason is that since the irregular hardening material 3 is interposed therebetween, members made of dissimilar materials which are generally difficult to weld can be easily connected. Similarly, since it is electrically interrupted by being connected via the irregularly shaped hardening material 3, there is no problem of contact corrosion between aluminum or carbon fiber and steel, which is different in potential, and usually welding or Difficult members that are problematic in bolt joining can be easily connected.

The upper column base member 1a and the lower column base member 1
At least one of b may be made of a surface-treated metal member. Because the irregular hardening material 3 is interposed therebetween, it is possible to easily connect even a member made of a surface-treated metal, such as a galvanized metal member or a coating member, which is difficult to weld.

As described above, in the column base structure of the present invention, the column base structure having the base plate 2 for bolt connection at the lower end of the column base comprises the upper column base member 1a and the lower column base member 1b.
The lower column base member 1b is connected to the bottom of a hollow pipe having a diameter larger than the outer diameter of the lower end of the upper column base member 1a by bolting base plate 2
The lower end of the upper column base member 1a is inserted into the lower column base member 1b by a predetermined length, and the inner surface of the hollow tube of the lower column base member 1b and the lower end insertion portion of the upper column base member 1a are inserted. Since the lower column base member 1b and the upper column base member 1a have a structure in which the irregular hardening material 3 is filled in between the outer surface and the lower column base member 1b and the upper column base member 1a, the upper part made of a mold steel or a steel pipe which hardly undergoes secondary processing. The column base member 1a and the lower column base member 1b with advanced joining processing and anticorrosion treatment between the lower end of the column base and the base plate 2 can be divided and manufactured, so that the productivity is greatly improved and the cost can be reduced. Further, the lower column base member 1b, in which the base plate 2 for bolt connection is welded to the bottom of the hollow pipe having a diameter larger than the lower end of the upper column base member 1a, has a larger diameter than the upper column base member 1a, so that the plate thickness is not increased. In this case, the cross-sectional performance can be afforded, the stress at the weld between the hollow tube and the base plate 2 can be easily reduced, and the vertical ribs for stiffening can be omitted. Further, since the steel pipe portion of the lower column base member 1b is low in height, welding between the steel pipe and the base plate 2 can be performed from the inside, and inspection can be performed, so that reliable quality control can be performed. In addition, since the vertical ribs can be omitted, there is no problem of residual stress at the weld toe due to heat input from the hot-dip galvanizing bath to the vertical rib turning welding portion. It has a structure in which a predetermined length is inserted into the steel pipe portion of the member 1b and the irregular hardening material 3 is interposed therebetween,
Is transmitted to the lower column base member 1b via the base plate 2, so that stress concentration on the welded portion of the base plate 2 is reduced.

Next, a method of constructing the column base structure as described above will be described with reference to FIGS. First, a lower column base member 1b in which a base plate 2 for bolt connection is continuously provided at the bottom of a hollow tube having a diameter larger than the outer diameter of the lower end of the upper column base member 1a.
Is fixedly connected to a foundation 11 via an anchor bolt 10.
Next, the upper column base member 1a is inserted into the hollow tube portion of the lower column base member 1b.
Insert the lower end of the cable by a predetermined length. At this time, the position of the upper column base member 1a can be easily set to an appropriate position by, for example, arbitrarily adjusting the screwing amounts of the three adjusting bolts 6 penetrating the hollow tube portion. it can. Next, an irregular hardening material 3 such as epoxy or mortar is filled between the inner surface of the hollow tube of the lower column base member 1b and the outer surface of the lower end insertion portion of the upper column base member 1a.
And the upper column base member 1a. The adjusting bolt 6 is finally removed and subjected to a hole filling process by a conventional method. Also, instead of the adjustment bolt 6, the position of the upper column base member 1a may be adjusted by driving a wedge from the upper end side of the hollow tube portion toward the gap between the upper column base member 1a and the lower column base member 1b. it can. As described above, by inserting the lower end portion of the upper column base member 1a into the hollow tube portion of the lower column base member 1b at a predetermined position by a predetermined length, height adjustment, inclination, and the like can all be adjusted. As described above, since precise mortar adjustment is not required on the lower surface of the base plate, a method of constructing a column base structure excellent in workability can be provided. The upper column base member 1a and the lower column base member 1
It is, of course, possible to implement the completed column-base structure in which b is connected via the irregular-shaped hardening material 3 in the same manner as a normal column-base construction method.

[0020]

As is clear from the above description, the present invention is constituted by column base members made of a shape steel or a steel pipe which hardly undergoes secondary processing, and can be dividedly manufactured, so that the productivity is improved and the cost is greatly increased. It is possible to reduce the cost, to relieve stress concentration, to greatly increase mechanical strength and durability, and to perform reliable quality control and maintain a high quality level. Therefore, the present invention greatly contributes to industrial development as a method of constructing a column base structure that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a perspective view showing another embodiment.

FIG. 4 is a cross-sectional view showing another embodiment.

FIG. 5 is a perspective view showing an upper column base member having a projection formed on an outer surface.

FIG. 6 is a perspective view showing a lower column base member having a projection formed on an inner surface.

FIG. 7 is a cross-sectional view showing a construction example.

FIG. 8 is a horizontal sectional view of FIG. 7;

FIG. 9 is a perspective view showing a conventional example.

[Explanation of symbols]

 1a Upper column base member 1b Lower column base member 2 Base plate 3 Irregular hardened material 4 Vertical rib 5 Projection 6 Adjustment bolt 10 Anchor bolt 11 Foundation

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Okimoto 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Tetsumi Kondo 2-6, Otemachi, Chiyoda-ku, Tokyo 3. Inside Nippon Steel Corporation (72) Inventor Shiro Kita 1-10-1 Yurakucho, Chiyoda-ku, Tokyo Yoshimo Topall Corporation (72) Inventor Masafumi Hikasa 3-1-1, Nori-ku, Nishi-ku, Osaka-shi, Osaka F term (reference) in Inaba Electric Works 2D046 AA14 2E125 AA03 AA76 AB13 AC16 AE01 AF03 AG10 AG12 AG14 BE08 CA72 CA82 CA87 DA03 EA01 EA11 EA33

Claims (7)

[Claims] 1. A column base structure having a base plate for bolt connection at a lower end of a column base includes an upper column base member and a lower column base member, and the lower column base member is larger than a lower end outer diameter of the upper column base member. Assuming that a base plate for bolt connection is continuously provided at the bottom of the hollow tube having a diameter, the lower end of the upper column base member is inserted into the lower column base member for a predetermined length, and the hollow tube inner surface of the lower column base member is A column base structure wherein an irregular hardening material is filled between an outer surface of a lower end insertion portion of an upper column base member and the lower column base member and the upper column base member are combined and integrated. 2. The column base structure according to claim 1, wherein the lower column base member is made of cast steel, and the hollow tube and the base plate are integrally formed. 3. The column base structure according to claim 1, wherein the upper column base member and the lower column base member are made of different kinds of members. 4. The column base structure according to claim 1, wherein at least one of the upper column base member and the lower column base member is made of a surface-treated metal member. 5. The column base according to claim 1, wherein at least one of the inner surface of the hollow tube of the lower column base member and the outer surface of the lower end insertion portion of the upper column base member has a shaky projection. Structure. 6. The column base structure according to claim 1, wherein the amorphous hardening material is made of a viscoelastic material. 7. A column base structure having a base plate for bolt connection at a lower end of a column base, comprising an upper column base member and a lower column base member, wherein the lower column base member is larger than an outer diameter of a lower end of the upper column base member. The base plate for bolt connection is connected to the bottom of the hollow tube with a diameter, and this is rigidly connected to the foundation via an anchor bolt, and then the lower end of the upper column base member is attached to the hollow tube portion of the lower column base member. A predetermined length is inserted, and then an irregular hardening material is filled between the inner surface of the hollow tube of the lower column base member and the outer surface of the lower column insertion portion lower end portion, and the lower column base member and the upper column base member are filled. A method for constructing a column base structure, wherein the column base structure is integrated.