JPS5934333A - Joint structure of steel tube and concrete footing - 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 The present invention relates to a joint structure between a steel pipe and a concrete footing in a steel pipe sheet pile foundation.

As the foundation for supporting the piers, steel pipe sheet piles are placed in the ground in a circular or square shape, and concrete is poured in the upper part of the space surrounded by the steel pipe sheet piles to form the footing of the piers (see Figure 1). ). In the above structure, in order to integrate the fI4 pipe sheet pile and the concrete footing, it is necessary to provide connecting reinforcing bars protruding from the steel pipe sheet pile.A gusset plate is welded to the fllI wall of the steel pipe sheet pile, and the reinforcing bars are attached to this gusset plate. Welding has been carried out as field work. However, welding, especially joining by on-site bath welding, has been problematic due to the low reliability of on-site welding, the dependence of construction on weather conditions, and the difficulty of construction management.

Therefore, the steel pipe and the cassette plate and another plate and the reinforcing bar were welded in advance at the factory, and the plate with the gusset grate and the reinforcing bar welded together was joined with high-tensile bolts, but the guide ring was removed when driving the steel pipe. In addition, since the joint position with the concrete footing is fixed, it is necessary to improve the driving accuracy of the steel pipe, and it is also necessary to deal with deformation of the cassette grate, and to perform high-tensile bolt joints in a narrow space. First, there were construction problems. Additionally, there are problems in construction, such as shearing force acting on the joints between the steel pipe sheet pile and the gusset grate or the cassette plate and the reinforcing bars, resulting in large stress concentrations, and the reinforcing bars themselves not being suitable for welding. Next.

This invention was developed to solve the above-mentioned problems, and it is a steel that does not require any welding, has excellent bending and shear strength, and deformation performance, and is easy to construct. ? and concrete footings.

Details #1 will be explained below with reference to the illustrated embodiment.

The first quotient shows an outline of the location where the "departure" will be carried out, and is used as the foundation for supporting the bridge nA'fc. Concrete 2 for the footing part is placed in the space surrounded by 111 8I5. Connecting steel 3
Use! Ru. Various embodiments thereof are shown in FIG. 2 and below.

In Fig. 2, a slit is bored as a through hole 4 in the side wall of a steel pipe 1), one end of a dowel square steel plate to which reinforcing bars are welded as a connecting steel material 3 is inserted into the through hole 4, and this connecting steel material 3 is fixed. Filling concrete 5 is placed inside the steel pipe 1 as shown in FIG.

In FIG. 3, a large number of circular holes are bored as the through holes 4, reinforcing bars are used as the connecting steel members 3, and the reinforcing bars are inserted into each of the circular holes and fixed with concrete 2 and 5.

As shown in FIG. 4, a rectangular opening is drilled as a through hole 4, and a large number of connecting steel members 3 made of reinforcing bars are inserted together and fixed in concrete 2 and 5.

In FIG. 5, a rectangular opening and a circular hole are used together as the through hole 4, and the anchor steel material 3 is used as the reinforcing bar.

In FIG. 6, a slit and a circular hole are used together as the through hole 4, and a can plate and a reinforcing bar are used together as the anchor steel material 3. Note that the reference numeral 6v in the figure indicates the ground.

This project '11 did not have the above-mentioned configuration, but the first reinforcing bar was made by pushing a connecting rod made of steel with dowels etc. into the through hole in the side wall of the steel pipe, and placing concrete inside the steel pipe and fixing it. There is no need to weld the steel pipe and the connecting end, and there is no need to weld reinforcing bars, and the bending that acts on the joint is caused by moment and shear.
The ar force is transmitted through the pull-out resistance and shear resistance of the connected phase. As a result, the flow of force is transmitted from the connecting can material to the copper due to friction with the concrete on the pipe wall surface, so stress concentration at the steel pipe station ysvz〆7/mugi'% is avoided, unlike in conventional structures to be welded. does not occur. Therefore, safety is improved against the effects of earth debris forces and other directional loads acting on the structure. Furthermore, since the connecting steel material is inserted into the through hole of the steel pipe, the position and size of the through hole can be fully selected. Furthermore, it has a relatively single-wire structure that is easy to process,〃1! Good workability, shortened first half, and low construction costs M 'c ``J' he
Make it look like fx.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the lit parts of the embodiment, Fig. 2 A, B, Fig. 3 A, B, Fig. 4 A
, B, FIGS. 5A and 5B and FIGS. 6A and 13 are cross-sectional views of main parts of different embodiments, respectively, seen from the side and front sides. l...Copper pipe, 2...Concrete, 3
...Connection steel material, 4...Through hole, 5...
...Concrete, 6...Ground. Figure 2 A B 31' (5 No. 6 Sumitomo Metal Industries, Ltd. Central Technical Research Laboratory, 1-3 Nishinagasu Hondori, Amagasaki City (Elderly Inventor Satoshi Kato 1-3-2 Marunouchi, Chiyoda-ku, Tokyo) Within Sumitomo Metal Industries, Ltd. Applicant: Sumitomo Metal Industries, Ltd. 5-15 Kitahama, Higashi-ku, Osaka Procedural amendment 1, Description of the case: Total 1957 Patent Application No. 145794 2, Name of invention Steel pipe and concrete footing 3. Relationship with the case of the person making the amendment Patent applicant 4, Agent Address ■107 Shadow Akasaka 6, 6-5-21 Akasaka, Minato-ku, Tokyo, Number of inventions increased by amendment■ , "High tensile strength bolt joint in a narrow place" in the third line from the bottom of the second specification of the Ming specification is amended to "High tensile strength bolt joint in a narrow place". 2. Ibid., page 4, line 5, 12 "5" in line 1 and line 15 is corrected to "7". 3. "Code 6" in line 1 of page 5 of the same book is corrected to "1 code 5". 4. Page 6 of the same book Correct the lines from 6th to 7th lines as follows.
- Filled concrete. 5. Correct the figures 1 to σ as shown in the attached sheet. Figure 3 Figure N4

Claims (1)

[Claims] A through hole is formed in the side wall of the steel pipe, one end of the connecting steel material is inserted into the steel pipe, and is fixed by concrete filled inside the steel pipe, and the other end of the connecting steel material is fixed to the concrete of the footing. Joint structure of steel pipe and concrete footing.