JPH01102128A - Support structure for concrete structure - Google Patents

Abstract

PURPOSE:To reduce the absorption of horizontal forces during earthquake by a method in which a concrete structure and steel tubular piles to support the concrete structure are constructed in such a way as to enable them to slide horizontally, and the connection of the reinforcing bars is designed to have a rollaway structure. CONSTITUTION:Reinforcing bars 3 are welded to the upper inside of a steel tubular pile 2 through a spacer 4, and a top plate 5 having holes enough to allow the bars to deflect is welded to the upper end of the the pile 2. The upper concrete structure 1 is connected to the pile 2 through a slide plate 6 and a slide part 7 by the bars 3 piercing the plate 5. The absorption of horizontal forces transmitted to the structure 1 during an earthquake can thus be reduced by absorption.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a concrete structure support structure that connects a concrete structure and a steel pipe pile that supports the structure by extending reinforcing bars between the two.

[Conventional technology]

Conventionally, in the above-mentioned concrete structure support structure, the concrete structure and the steel pipe pile were simply rigidly connected with reinforcing bars extending between them.

[Problem that the invention seeks to solve]

However, in conventional structures, high bonding strength can be obtained by connecting reinforcing bars between the concrete structure and the steel pipe pile, and it is able to withstand not only the load from above but also the pull-out force applied from the concrete structure to the steel pipe pile. However, on the other hand, there was a problem that there was no seismic isolation function against earthquakes, and earthquake vibrations were directly transmitted from the steel pipe piles to the concrete structure above.

An object of the present invention is to solve the above-mentioned problems through rational improvements using reinforcing bars that connect steel pipe piles and concrete structures.

[Means for solving problems]

The characteristic configuration of the concrete structure support structure according to the present invention is that, when a concrete structure and a steel pipe pile supporting it are connected by reinforcing bars across both, the reinforcing bars are connected at a location lower than the upper end of the steel pipe pile. A state in which the concrete structure is connected to the steel pipe pile in a state that allows lateral vibration using the lower end side connection point as a fulcrum, and the reinforcing bars extend upward from the upper end of the steel pipe pile, and the concrete structure is connected to the reinforcing bars. The reason is that it is placed on the upper end of the steel pipe pile so that it can slide freely in the horizontal direction, and its functions and effects are as follows.

[For production]

In other words, according to the above configuration, the horizontal force of an earthquake is affected by the elastic lateral vibration of the reinforcing bars at a location lower than the top of the steel pipe pile, with relative sliding between the steel pipe pile and the concrete structure. be absorbed.

In other words, the elastic flexural deformation of the reinforcing bars that provides deflection flexibility reduces (seismic isolation) the seismic vibrations transmitted from the steel pipe piles to the concrete structure.

On the other hand, although it can exhibit the above-mentioned seismic isolation function, the load applied from above from the concrete structure is reliably received by the steel pipe pile, and the pull-out force applied from the concrete structure is It is reliably transmitted to the concrete piles through reinforcing bars that span the steel pipe piles.

〔Effect of the invention〕

As a result of the above, the joint strength between the concrete structure and the steel pipe pile has the same high strength as conventional structures against both load and pull-out force from above, while also being seismically isolated against earthquakes. It has now been possible to provide an excellent concrete structure support structure that can effectively perform its functions and suppress and reduce earthquake vibrations transmitted to the concrete structure.

Moreover, since the above-mentioned seismic isolation function is achieved by using reinforcing bars for connecting the concrete structure and the steel pipe pile, there is an advantage that the improvement cost can be reduced.

〔Example〕

Next, an example will be described.

FIG. 1 and FIG. 2 show a concrete structure support structure in which a concrete structure (1) and a steel pipe pile (2) supporting it are connected with reinforcing bars (3) interposed between the two.

From the top of the steel pipe pile (2), the concrete structure (1)
A plurality of reinforcing bars (3) are arranged in a ring shape and extend upward for connection with the steel pipe pile (2).
) is welded to the inner surface of the steel pipe pile (2) at a location lower than the upper end of the steel pipe pile (2) to allow swinging around the lower end side connection point (P) in the hole.

In addition, when connecting them by welding, reinforcing bars (3) and steel pipe piles (
A steel spacer member (4) is attached to the inner surface of the reinforcing bar (3) to form a flexible interval between the inner surface of the reinforcing bar (3) and the inner surface of the reinforcing bar (3).
and the inner surface of the steel pipe pile (2).

A steel top plate (5) is welded to the top end of the steel pipe pile (2) in a lid-like manner.
A flexible hole (
6) (i.e., penetrating reinforcing bars with hole diameters several times the diameter of the reinforcing bars (
A hole) is formed between the reinforcing bar (3) and the inner periphery of the hole to accommodate the deflection of the reinforcing bar (3).

The upper concrete structure (1) has a top plate (5
) is connected to the reinforcing bars (3) passed through the accommodation holes (6) of the top plate (5), and with a sliding material (7) interposed between it and the top plate (5) to reduce sliding resistance. (5) It is slidably placed on the top.

In other words, the reinforcing bars (3) inside the steel pipe pile (2) in a state that involves relative sliding between the concrete structure (1) and the top plate (5).
Due to the elastic deflection (elastic deflection deformation) of the steel pipe pile (2)
It is designed to absorb and reduce the horizontal force of an earthquake transmitted from the ground to the upper concrete structure (1).

In addition, when interposing the sliding material (7) between the concrete structure (1) and the top plate (5), a steel sliding plate (8) is attached to the lower surface of the concrete structure (1). A sliding member (7) made of an appropriate material is inserted between the sliding plate (8) and the top plate (5) to ensure smooth sliding between them.

In addition, the reinforcing bar through hole (9) formed in the sliding plate (8) is inserted into the reinforcing bar (
3) The holes are of the same diameter, so that when pouring concrete to form the concrete structure (1), the concrete is poured from the part of the through hole (9) through which the reinforcing bars are inserted toward the sliding part. It is designed to prevent leakage.

In the figure, (10) is earth and sand filled into the hole of the steel pipe pile (2).

[Another example]

Next, another example will be listed.

(b) As shown in Figure 3, the reinforcing bars (3) are attached to the steel pipe piles (2).
It may be connected to the outer periphery of the steel pipe pile (2) at a location lower than the upper end of the pipe pile (2).

In this case, it is preferable to provide a cover (11) as shown in the figure.

(b) The specific detailed structure for connecting the reinforcing bars to the steel pipe pile at a point lower than the upper end of the steel pipe pile in a state that allows swinging around the lower end side connection point as a fulcrum can be appropriately improved.

(c) A buffer material made of an appropriate material that acts as a cushion against the deflection of the reinforcing bars may be installed in the space below the top plate that allows for the deflection of the reinforcing bars.

(d) To slidably place the concrete structure on the top plate fixed to the top end of the steel pipe pile, the concrete structure may be placed directly on the top plate, or various methods may be used. It may be placed through a sliding mechanism of the structure, and if a sliding material is interposed between the two, the material of the sliding material and the specific intervening structure can be changed and improved in various ways. It is.

(e) The diameter ratio of the reinforcing bars and the accommodation holes should be determined appropriately;
Further, a plurality of reinforcing bars may be passed through one of the accommodation holes.

(f) The concrete structure may be anything such as a building or a bridge.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being an exploded perspective view. FIG. 3 is a sectional view showing another embodiment of the present invention. (1)... Concrete structure, (2)...
...Steel pipe pile, (3) ...Reinforcement bar, (5) ...
...Top plate, (6)...Accessibility hole, (7)...
... Sliding material, (P) ... Connection point.

Claims (1)

[Scope of Claims] 1. A concrete structure support structure in which a concrete structure (1) and a steel pipe pile (2) supporting the same are connected by extending reinforcing bars (3) between the two, wherein the steel pipe pile (2)
The reinforcing bar (3) is connected to the steel pipe pile (2) at a point lower than the upper end in a state that allows lateral swing around the lower end connection point (P) as a fulcrum, and the reinforcing bar (3) is connected to the steel pipe pile (2) at a point lower than the upper end. Extending above the upper end of the steel pipe pile (2), the concrete structure (1) can freely slide horizontally on the upper end of the steel pipe pile (2) while connected to the reinforcing steel (3). Concrete structure support structure placed on. 2. The steel pipe pile (2) is attached to the top plate (5) in which an accommodation hole (6) is formed to penetrate the reinforcing bar (3) while allowing its lateral swing.
), and the concrete structure (1) is slidably mounted on the top plate (5) while connected to the reinforcing steel (3) that passes through the accommodation hole (6). A concrete structure support structure according to claim 1. 3. The concrete structure support structure according to claim 1 or 2, wherein the reinforcing bars (3) are connected to the steel pipe pile (2) within the hole thereof. 4. A sliding material (7) is interposed between the top plate (5) and the concrete structure (1) to reduce the sliding resistance of both (1) and (5). The concrete structure support structure described in Section 2.