JPH0667544U - Anchor bolt with reinforced pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to increase the proof stress of shearing force and bending moment by the integrated reinforcing steel pipe around the anchor bolt, and to increase the proof stress of the conventional method, which is a blind point of the conventional method. It is an object of the present invention to provide an anchor bolt with a reinforcing pipe, which has the effect of significantly increasing the size of the anchor bolt. [Structure] A reinforcing steel pipe having a proof stress is incorporated in an outer peripheral portion of an anchor bolt.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This proposal relates to an anchor bolt with a reinforcing pipe, and more specifically, the anchor bolt is used in the leg part of the pillar such as a steel frame building.To secure the anchor bolt and its accurate position, It is a thing.

[0002]

[Prior art]

 Conventionally, this kind of thing is as follows. 1. Column anchor bolts have been mainly designed to bear the force for pulling force. At the same time, it is intended to increase the burden of shear force and the bending moment due to the shear force. 2. There was a morning glory-shaped trumpet-shaped trumpet called a trumpet that also facilitated the accurate positioning of the anchor bolt in the plane by the clearance between the attached reinforcing steel pipe and the anchor bolt.

[0003]

[Problems to be solved by the device]

 The conventional techniques described above have the following problems. In principle, the shear force of the column base called seismic force is transmitted by the friction between the column base plate and concrete (or mortar). However, when the vertical movement is applied, the frictional force becomes small even at the moment. At that time, a shearing force acts on the anchor bolt, and a bending moment acts at the same time. Anchor bolts have extremely small shear strength and bending moment resistance as additional stress.

The present application has been made in view of such problems of the conventional technology, and an object of the present application is to provide the following. In other words, a reinforcing steel pipe having a proof stress is integrated and embedded in concrete to assemble a set of durable anchor bolts.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is as follows. That is, in the anchor bolt main body 2 of the present application, a vertical portion 2A having a predetermined size, a side surface J-shaped portion 2B continuous with the lower end of the vertical portion, and a neck portion 2C engraved at the upper end portion of the vertical portion. The reinforcing steel pipe 3 which is composed of a nut 2D screwed to the threaded portion and which is attached to the upper portion of the vertical portion 2A of the anchor bolt main body 2 includes a cylindrical steel pipe main body 3A and the cylindrical steel pipe main body 3A. It is composed of an upward facing bosh portion 3B continuously provided at the lower end of the anchor bolt body 2, and an anchor bolt main body 2 is inserted into the reinforcing steel pipe 3 at an axial center position. The vertical portion 2A in the main body is an anchor bolt with a reinforcing pipe integrally processed by welding or the like. In this case, the reinforcing steel pipe can be a square steel pipe.

[0006]

【Example】

 Examples will be described with reference to the drawings. 1 is an anchor bolt with a reinforcing pipe of the present invention. An anchor bolt main body 2 has a vertical portion 2A having a predetermined size, a side surface J-shaped portion 2B connected to the lower end of the vertical portion, a screw portion 2C engraved on the upper end portion of the vertical portion, and a screw on this screw portion. It is composed of a nut 2D which is fitted.

Reference numeral 3 denotes a reinforcing steel pipe attached to an upper portion of the vertical portion 2A of the anchor bolt main body 2, which is a cylindrical steel pipe main body 3A and an upward facing bosh portion 3B continuous with the lower end of the cylindrical steel pipe main body. It consists of and. In this case, the reinforcing steel pipe 3 may be formed by separately forming the cylindrical steel pipe main body 3A and the upward facing bosh portion 3B, and welding them together to form one body or by so-called punching. Good. Further, the reinforcing steel pipe may be a square steel pipe.

Then, the anchor bolt main body 2 is inserted into the reinforcing steel pipe 3 at the axial center position, and the center of the upwardly facing bosh portion 3B and the vertical portion 2A of the anchor bolt main body are integrated by welding or the like. It is processed. The upward bosh portion 3B is formed at the lower end of the reinforcing steel pipe main body in order to prevent a gap from being formed between the concrete to be driven. The vertical portion 2A of the anchor bolt main body is integrally processed by welding or the like in order to ensure an appropriate vertical position of the reinforcing steel pipe with respect to the anchor bolt main body.

In this case, regarding the performance such as the size of the reinforcing steel pipe, the seismic force (shearing force) that may occur may be assumed, and a suitable one may be selected. The depth of embedding in the concrete foundation is also selected. The embedding depth is around 3 times the thickness of the filling mortar.

In terms of dimensions, the following conditions were suitable. Diameter of anchor bolt main body ~ 22 mm, outer diameter of steel pipe for reinforcement ~ 89.1 mm, wall thickness of steel pipe for reinforcement ~ 3.2 mm, length of steel pipe for reinforcement ~ 300 mm.

The operation will be described together with the effect. After accurately determining the planar position of the anchor bolt with a reinforcing pipe 1 of the present invention with respect to the concrete foundation 4, the non-shrink mortar 6 is packed in the clearance between the reinforcing steel pipe and the anchor bolt. Then, non-shrink mortar 6 is packed between the base plate 5 fixed to the lower end of the steel frame column 5A and the upper end of the concrete foundation (generally around 50 mm). In addition, the clearance between the reinforcing steel pipe and the anchor bolt allows the planar position of the anchor bolt to be adjusted accurately.

[0012]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. 1. The integrated reinforcing steel pipe around the anchor bolts can significantly increase the seismic capacity associated with vertical movement, which was a blind spot in the conventional method, due to the increase in shear and bending moment capacity. 2. It is possible to easily determine the exact planar position of the anchor bolt.

[Brief description of drawings]

FIG. 1 is an enlarged front view of a main part of the present invention with a part cut away.

FIG. 2 is a plan view of a usage state.

FIG. 3 is a vertical sectional view of the above.

[Explanation of symbols]

 1 Anchor bolt with reinforcement pipe 2 Anchor bolt body 3 Steel pipe for reinforcement

Claims (2)

[Scope of utility model registration request] 1. An anchor bolt main body (2) is engraved on a vertical portion (2A) of a predetermined size, a side J-shaped portion (2B) connected to a lower end of the vertical portion, and an upper end portion of the vertical portion. The screw part (2C) and the nut (2
D) and a reinforcing steel pipe (3) attached to the upper part of the vertical portion (2A) of the anchor bolt main body (2) is a cylindrical steel pipe main body (3A) and the lower end of this cylindrical steel pipe main body. Upward-looking morning glory part (3
B) and an anchor bolt main body (2) penetrates into the reinforcing steel pipe (3) at an axial center position, and the center of the upward facing bosh (3B) and the vertical portion (2A) of the anchor bolt main body. ) Is an anchor bolt with a reinforcing pipe, which is integrally processed by welding or the like. 2. The anchor bolt with a reinforcing pipe according to claim 1, wherein the reinforcing steel pipe is a square steel pipe.