JP2016186220A - Dowel using reinforcement steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dowel using a reinforcement steel pipe capable of preventing a deterioration in a resistance force caused by a cross-sectional defect of a steel plate and a dowel which is high in slip prevention rigidity.SOLUTION: A steel pipe reinforced by a steel material is attached to a cross-sectional defect place of a steel plate. The attached reinforcement steel pipe can prevent a deterioration in a resistance force caused by the cross-sectional defect, and also function as a slip prevention member between concrete and the steel material.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a gibber used for preventing slippage between concrete and steel such as a building structure or a civil engineering structure.

In general, the higher the building, the greater the burden of vertical load on the vertical member. The vertical load has two main components. One is its own weight proportional to the height of the building. The other is the additional axial force generated by the overturning moment caused by horizontal forces such as wind loads and seismic loads. Such additional axial force increases geometrically according to the height of the building. The most important issue for engineers is how to bear a huge vertical load. Solutions to this problem include increasing the strength of the material and installing large sections and reasonable vertical members in the building. In order to suppress out-of-plane deformation of the formwork installed on a steel / concrete composite column with a large cross-section that can be applied to future ultra-high-rise buildings and the steel sheet that functions stress transmission, The entire cross section of the vertical member is penetrated in the out-of-plane direction of the steel plate that functions as a formwork and stress transmission. After the concrete is hardened, if necessary, a tension force can be introduced into the through bolt, and the vertical member can be strengthened by the introduced tension force. However, the through-holes for through-bolts with strong axial rigidity are produced, so that the axial strength of the vertical member of the steel sheet decreases due to the cross-sectional defect. Along with this, a perforated steel plate gibel that can transmit axial force with good performance is also required for structural design.

Patent Literature: JP 2012-197643 (P2012-197643A)

The present invention provides a dowel using a reinforced steel pipe capable of transmitting an axial force having good performance and a dowel having high rigidity.

Fig. 1 shows an example of an elevation view of a huge steel / concrete composite column that can be applied to mega in future super high-rise buildings, while Fig. 2 shows a cross-section of the huge steel / concrete composite column shown in Fig. 1. An example of a surface is shown. As shown in Fig. 2, concrete filling acts as a stiffening rib 7 (all column height installation), main reinforcement 8 and shear reinforcement (or structural reinforcement) 9 and a huge main reinforcement in the vertical direction of the cross section Install steel pipe element 10 (hereinafter referred to as CFT-type mega main bar). The CFT mega main bar 10 is further provided with a conventional main bar 11 in the steel pipe. The steel plate 1 and the steel plate 3 have a formwork function. When placing, the steel plate 3 is likely to be deformed out of plane. In order to suppress the out-of-plane deformation, the through-bolt 12 having a high axial rigidity passes through the entire cross section of the steel plate 3 in the out-of-plane direction of the steel plate 3 and is temporarily fixed with nuts 13 at both ends before the placement. Since through-holes 14 for through-bolts with strong axial rigidity are generated, the steel plate 2 and the steel plate 3 have a cross-sectional defect and the axial proof stress decreases. In order to prevent a decrease in axial proof stress due to a cross-sectional defect, a gibber 16 using a type of reinforcing steel pipe that protrudes from both sides of the steel sheet through the through-hole 14 for through-bolts in the steel sheet 2 is provided. At the same time, a reinforcing steel pipe 15 is inserted from the inside of the steel plate 3 into the through-hole for the through bolt of the steel plate 3, and a diver 17 using a type of reinforcing steel pipe protruding on one side of the steel plate is provided. If necessary, protrusions 18 having high slip prevention rigidity and shear connectors 19 that have been widely used in the past are attached to both surfaces of the steel plate 2 and inside the steel plates 1 and 3. Further, if necessary, stiffening ribs 20 are installed in the horizontal direction as shown in FIG. After that, the steel tube 4 is filled with concrete 5. After the concrete 5 is hardened, tension can be introduced into the through bolt 12 and the column can be strengthened by the introduced tension. Further, if necessary, a through bolt 12 can also be attached in the strong axis direction (not shown).

Fig. 4 shows an example of a cross-sectional view of a steel / concrete composite wall that can be applied to the future shear wall (especially the center core) of a super high-rise building. FIG. 3 shows an enlarged view of a part of FIG. In this synthetic wall, three steel plates 28 and a plurality of separating steel plates 29 are attached in the in-plane direction within the wall. A main reinforcement 8, a shear reinforcement (or structural reinforcement) 9, a protrusion 18 and a shear connector 19 are installed in each formed steel tube. In addition, through bolts 12 with strong shaft rigidity, and gibels 16 and 17 using reinforced steel pipes are also installed. Furthermore, a CFT-type mega main muscle 10 is also arranged as necessary. The separating steel plate 29 is basically installed up to the entire height of the wall. In this synthetic wall, the filled concrete 5 restrains the steel plate 28 installed in the central region of the wall from both sides, and stiffens the steel plate 28 installed in the central region. The filled concrete 5 can also stiffen the outer steel plate 28 that functions as a formwork. The attached through-bolt 12 can suppress the out-of-plane deformation of the steel plate 28 having a formwork function when casting concrete. After the concrete 5 is hardened, the composite wall can be strengthened by introducing tension to the through bolt 12.

The steel plates, steel pipes, and stiffening ribs of all the embodiments described above are striped steel plates 43 having small lattice-shaped protrusions 44 on the surface in contact with the concrete in order to increase the adhesion strength between the concrete and the steel material (see FIG. 11). May be used.

Next, a description will be given of a gibber using a reinforced steel pipe according to the present invention.

FIG. 5 shows details of the first embodiment of the gibber 16 using the reinforced steel pipe according to the present invention. The gibber 16 using this reinforced steel pipe is composed of a steel plate 39 in which holes 14 penetrating both sides are formed, and a reinforced steel pipe 15 penetrating through the holes 14 of the steel plate 39 and projecting on both sides. The reinforcing steel pipe 15 is joined to the steel plate 39 by welding. The reinforcing steel pipe 15 attaches the reinforcing steel plate 15-2 to the steel pipe 15-1. The reinforcing steel plate 15-2 is also joined to the steel pipe 15-1 by welding. The axial strength reduction value F due to the cross-sectional defect of the hole 14 in the steel plate 39 is supplemented by the strength of the reinforcing steel plate 15-2. I want to satisfy [1].

here,
f _y1 : Yield point strength of steel plate 39, f _y2 : Yield point strength of reinforcing steel plate 15-2 for supplementing axial force, d ₁ : Diameter of hole 14 (outer diameter of reinforcing steel pipe 15), t ₁ : Thickness of steel plate 39 , T ₂ : thickness of reinforcing steel plate 15-2 for supplementing axial force, l: length of reinforcing steel pipe 15 (length of reinforcing steel plate 15-2 for supplementing axial force), s _B : compressive strength of concrete.
Unlike the conventional perforated steel plate gibel, the gibber 16 using this reinforced steel pipe can eliminate the reduction of the axial force burden due to the cross-sectional defect, and is suitable for use in the place where the cross-sectional defect exists. In addition, the gibber 16 using this reinforced steel pipe has the advantage that it can transmit a large axial force with higher rigidity than the conventional shear connector 19 (head stud), perforated steel plate gibel, and steel pipe combined perforated steel plate gibel. There is.

FIG. 6 shows details of the reinforced double steel pipe 15-a in the second embodiment of the gibber 16 using the reinforced steel pipe. This reinforced double steel pipe 15-a has a double steel pipe 15-1, and further has a reinforcing steel plate 15-2 attached thereto. In the third embodiment, the steel pipe may be reinforced with steel materials such as H-shaped steel and I-shaped steel (not shown).

An embodiment of a gibber 17 using a reinforced steel pipe according to the present invention is shown in FIG. The gibber 17 using this reinforced steel pipe is composed of a steel plate 39 in which a through hole 14 is formed and a reinforced steel pipe 15 that penetrates the hole 14 of the steel plate 39 and protrudes to one side. The diver 17 using this reinforced steel pipe may be a reinforced double steel pipe 15-a projecting on one side or a form reinforced with steel materials such as H-shaped steel and I-shaped steel in a steel pipe projecting on one side. Good.

As an embodiment of the reinforced steel pipe 15 and the reinforced double steel pipe 15-a, a steel pipe reinforced by another method may be used (not shown).

FIG. 8 shows a first embodiment of the protrusion 18 having high slip prevention rigidity according to the present invention. In this embodiment, the protrusion 18 is a reinforced steel pipe 15. The reinforcing steel pipe 15 is integrally formed with the steel plate 40 by welding on one side of the steel plate 40 where no hole is provided.

Further, the embodiment of the protrusion 18 having high slip prevention rigidity may be an embodiment of the gibber 16 using the reinforced steel pipe and an embodiment of the gibber 17 using the reinforced steel pipe.

FIG. 9 shows another example of use of the gibber 16 and 17 using a reinforced steel pipe and the protrusion 18 having a high rigidity. FIG. 9 is an example in which the side end along the longitudinal direction of the steel plate 39 is fixed to a transverse base material (steel material) 45 of the building structure, for example, a steel beam flange or a steel plate for bracing.

When a gibber using a reinforced steel pipe according to the present invention and a protrusion with high slip prevention rigidity are attached to a cross-sectional defect of a steel sheet, it is possible to prevent a decrease in yield strength due to the cross-section defect. Also works. Moreover, it is possible to greatly improve the anti-slipping function, shear strength, axial strength, and anti-slipping rigidity at the joint between the steel-based member and the concrete-based member.

An example of an elevation view of a huge steel-concrete composite column Example of cross-sectional view of huge steel / concrete composite column shown in Fig. 1 Partial enlarged view of FIG. An example of a cross-sectional view of a steel / concrete composite wall Detailed view of the first embodiment of a gibber using a reinforced steel pipe that penetrates a steel plate and protrudes on both sides a) Front view of the first embodiment of a gibber using a reinforced steel pipe b) Side view of a) c) From concrete Figure showing the state of the maximum stress acting on the gibber using a reinforced steel pipe. D) Figure showing the state of the maximum stress acting on the reinforcing steel plate for supplementing the axial force in the gibber using the reinforced steel pipe. E) 1 for the reinforced steel pipe. The figure which shows the state which lets the through bolt of the book pass Detailed view of the second embodiment of the gibber using a reinforced steel pipe that penetrates the steel plate and protrudes on both sides a) Front view of the second embodiment of the gibber using a reinforced steel pipe b) Side view of a) c) Reinforced steel pipe The figure which shows the state which lets a bolt pass through Detailed view of an embodiment of a gibber using a reinforced steel pipe that penetrates a steel plate and protrudes to one side a) Front view of an embodiment of a gibber using a reinforced steel pipe b) Side view of a) Detailed view of the first embodiment of the protrusion with high detent rigidity a) Front view of the first embodiment of the protrusion with high detent rigidity b) Side view of a) Another embodiment of a gibber using a reinforced steel pipe and a projection with high rigidity Detailed view of an example of an embodiment of a CFT-type mega main bar a) Cross-sectional view of an example of an embodiment of a CFT-type mega main bar b) Part of a cross-sectional view taken along line Y6-Y6 in FIG. 10a) (partially omitted view) Detailed view of striped steel plate

Please refer to (0005) to (0015) regarding the embodiment of the gibber using the reinforced steel pipe according to the present invention and the protrusion with high rigidity.

The gibber using the reinforced steel pipe according to the present invention and the protrusion having high displacement prevention can be widely used in fields such as the construction industry and the civil engineering construction industry.

1: Steel plate (thick steel plate that functions as a flange)
2: Web (A steel plate that functions as a H-shaped steel web)
3: Side plate (thin steel plate that functions as a formwork)
4: Steel tube
5: Concrete filling
7: Stiffening rib
8: Main muscle
9: Shear reinforcement (or structural reinforcement)
10: CFT-type mega main muscle
11: Main muscle (longitudinal muscle built in CFT mega main muscle)
12: Through bolt with strong shaft rigidity
13: Nut
14: Hole (through hole)
15: Reinforced steel pipe
15-a: Reinforced double steel pipe
15-1: Steel pipe
15-2: Reinforced steel sheet for axial force resistance
16: Giber using reinforced steel pipes that protrude on both sides
17: Gibber using a reinforced steel pipe protruding on one side
18: Protrusion with high rigidity
19: Shear connector (mainly head stud)
20: Stiffening rib (horizontal installation)
27: Column (peripheral member)
28: Steel plate
29: Steel plate for isolation
39: Steel plate with holes
40: Steel plate without holes
41: Steel pipe
42: Ring-type rib
43: Striped steel plate
44: Lattice-like small protrusions
45: Base material (steel)
d ₁ : Hole diameter (outer diameter of reinforced steel pipe 15)
d ₂ : Inner diameter of steel pipe 15-1 (width of reinforcing steel plate 15-2 for supplementing axial force)
l: Length of reinforced steel pipe 15 (length of reinforced steel sheet 15-2 for supplementing axial force)
t ₁ : thickness of steel plate 39 with holes
t ₂ : Thickness of reinforcing steel plate 15-2 for supplementing axial force
F: Axial strength reduction value due to cross-sectional defect of hole 14 σ _B : Compressive strength of concrete
f _y1 : yield point strength of steel plate 39
f _y2 : Yield point strength of reinforcing steel plate 15-2 for supplementing axial force

Claims (1)

A reinforced steel pipe characterized by having a steel plate formed with a hole penetrating on both sides and a steel tube projecting through the hole of the steel plate and integrally formed with the steel plate formed with the through hole was used. A manufacturing method of the gibber.