JPS61277732A - Joint structure of steel pipe pillar and reinforced concretebeam - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a joint structure between a steel pipe column and a reinforced concrete beam.

``Conventional technology'' The steel pipe column-reinforced concrete beam joint that occurs in the reverse casting method, etc.

i) The load acting on the beam can be transmitted to the column.

ii) The method of arranging the reinforcing bars at the end of the beam must be such that the stress to be borne by the reinforcing bars can be expressed.

must meet the requirements.

Here, in order to ensure that +i) and +ii) are satisfied when columns are made of steel pipe columns in the reverse casting method where beam reinforcement cannot be brought into the cross section of the column, as in the cast-in-place method, The conventional means is at the joint.

As shown in FIG. 5, a method is used in which beam reinforcements 3 made of deformed steel bars are welded 4 to a reinforcing ring 2 attached to a steel pipe column 1.

Note that 5 in Figure 2 indicates the concrete layer.

``Problems to be Solved by the Invention'' However, the above method of joining the deformed steel bar to the reinforcing ring 2 by welding has the following disadvantages.

Namely.

i) The material of deformed steel bars (rebars) varies widely and has a high carbon equivalent, making welding unreliable.

ii) There is a horizontal tube, making it impossible to maintain a constant fillet leg length.

iii) The width of the reinforcing ring 2 is narrow (the reinforcing bar cannot be welded sufficiently long).

iv) On-site welding is required, which poses problems in ensuring quality.

(2) Since the plate axis of the reinforcing ring 2 and the axis of the deformed steel bar do not match, an eccentric load will occur.

etc.

``Means for Solving Problems'' and ``Operations'' The present invention was made in view of the above circumstances, and its gist is that structural material is welded to the tip of a reinforcing ring attached to a steel pipe column. The fitting hardware with bolt holes is prefabricated and welded.

A threaded sleeve is crimped onto the end of the reinforcing bar, and the joint hardware and the threaded sleeve are connected using relay bolts, thereby eliminating the inconvenience caused by the welding table when attaching the deformed steel bar to the reinforcing ring. In addition, in an improved form, the connection can be made in such a manner that the plate axis of the reinforcing link and the reinforcing bar axis coincide with each other, thereby eliminating eccentricity.

"Example" This will be explained in detail below based on the drawings.

Figures 1a to 1c are front views and top views of the joint structure of the present invention in which reinforcing bars are attached, and a front view in which beam concrete is placed. 6 in Figure 2 shows a welding table attached to the tip of the reinforcing ring 2. This is a joint metal fitting with bolt holes made of welded structural material that is attached by a welding structure, as shown in Fig. 2a.

b. As shown in detail in FIGS. 3a and 3b, a crotch portion 6b is formed on the opposite side of the bolt hole 6a, and the crotch portion 6b is shown in FIG. 3a.
As shown in detail in , it is fitted onto the tip of the reinforcing ring 2 and integrally joined by welding 7. Moreover, in FIG. 2, instead of using a joint hardware provided with a single bolt hole, it is also possible to use a joint hardware provided with two or more bolt holes.

This processing is done in a prefabricated factory,
High accuracy can be expected.

On the other hand, a sleeve 8 with a screw 8a is crimped onto the end of the reinforcing bar 3, as shown in detail in FIG.

Note that the embodiments shown in FIGS. 1, 2, and 3 described above are shown as best examples, and FIG. 5a.

As shown in b, the joint hardware 6 is basically constructed without shaping the crotch portion, and is integrally connected to the tip of the reinforcing ring 2 by mounting and welding 7''.

For example, the reinforcing ring 2 and the reinforcing bar 3 are as follows.

As shown in FIG. 4, it is possible to connect them on site using relay bolts 9.

In the figure, reference numeral 9a denotes a nut for rotating the bolt, and in this embodiment, the threads of the joint hardware 6 and the sleeve 8 are set in opposite directions.

Note that the screw connection is not limited to the example illustrated above.

The reinforcing bar 3 may be assembled by rotating the reinforcing bar 3 with respect to a screw that has been previously attached to the joint hardware 6.

According to this arrangement, the axial center of the reinforcing bar 3 and the plate axis of the reinforcing ring 2 coincide with each other, so that there is no problem in transmitting stress and it is ideal that no eccentric load occurs.

However, the case shown in FIG. 5 has the disadvantage of generating a moment during stress transmission, and is therefore limited to small diameter cases.

After that, as shown in FIG. 1C, stirrups are assembled (not shown), forms are made, and concrete 5 is poured to construct a reinforced concrete beam.

　　　　- In the above embodiments, a circular steel pipe column was described.

Even if the columns are made of square steel pipes or H-shaped steel, the connection structure will be exactly the same.

"Effect of the invention" As is clear from the above, 9 according to the present invention.

Prefabrication ensures the accuracy of reinforcing bar joint positions, and it is rational to use screw joints to avoid the disadvantages of joining reinforcing bars that are unsuitable for welding on an on-site welding table.

Meaningful. In the best case, there is no eccentric load for stress transmission, which is extremely advantageous.

[Brief explanation of drawings]

Figures 1a and 2c are front views and plan views of the joint structure of the present invention in which reinforcing bars are attached, and a front view in which beam (slab) concrete is placed. 3A and 3B are a front view and a plan view of the joint between the reinforcing ring and the joint hardware. FIG. 4 is a front view showing an example of the joint between the joint hardware and the reinforcing bar. Figures 5a and 5b are a front view and a plan view of a basic example of a joint between a reinforcing ring and a joint hardware, and Figures 6a and 6b are explanatory diagrams of a conventional joint structure. l... Steel pipe column , 2... Reinforcement ring, 3... Beam reinforcement,
4...Welding, 5...Concrete layer, 6...
・Joint hardware, 5a... Bolt hole, 6b... Crotch, 7... Welding, 8... Threaded sleeve + 8a...
・Screw, 9... Relay bolt, 9a... Nut. 2 chile A piq. b. a, b. gong layer 0゜

Claims (2)

[Claims] (1) Prefabricated fittings with bolt holes made of welding structural material are welded to the tip of the reinforcing ring attached to the steel pipe column, while a threaded sleeve is crimped to the end of the reinforcing bar. A joint structure between a steel pipe column and a reinforced concrete beam, characterized by connecting a joint hardware and a threaded sleeve with a relay bolt. (2) A fitting fitting with bolt holes made of welding structural material is welded to the tip of the reinforcing ring attached to the steel pipe column in a prefabricated manner, while a threaded sleeve is attached to the end of the reinforcing bar. A joint structure between a steel pipe column and a reinforced concrete beam bar, characterized in that the joint hardware and threaded sleeve are crimped together and connected with relay bolts.