JPH06123119A - Top type block for underwater - Google Patents

Abstract

PURPOSE:To control the occurrence of turbulent flow in water having a water flow by providing the center of the lower part of a body having an inverted truncated cone shape and an inverted truncated pyramid shape which have a circular and a square head with a shaft part whose section is elliptical, streamline-shaped, and rain drop-shaped. CONSTITUTION:The center of the lower part of an inverted truncated cone shape body 2 having a circular head 3 is provided with a shaft leg 7 having a streamline- shaped or a rain drop-shaped section. In this case the shaft leg 7 is set so that a longitudinal axial line may coincide with the direction of water flow, and the water flow may first strike against a streamlineshaped or a rain drop-shaped wide part. In the case where a top type block 1 for underwater is laid, a connecting raft for providing a shaft leg inserting section on a riverbed is laid down as occasion demands. In the case where the body 2 and the shaft leg 7 are separatedly constructed, the shaft leg 7 is vertically inserted into an installing face under a condition where the body 2 is not assembled yet, and a connecting bar is then fittedly inserted into the through hole of the body 2. Next the body 2 and the shaft leg 7 are integrally stuck with mortar. Thus an installing position can be simply decided to improve laying work ability, and the occurrence of a turbulent flow behind 10 the shaft leg 7 can be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater type coma-type basic block used in a place such as a coast, a lake, a shore or a bottom of a river, which is affected by a water flow.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Publication No. 560054 / SHO, a top type of an inverted frustoconical body having a circular head, and a cylindrical shaft leg projecting from the center of the lower end surface of the body. The embedded block balances the weight of the block itself and the vertical load received by the block with the total force of ground reaction force and frictional resistance generated on the body and axle, and exerts horizontal bearing capacity without uneven settlement. It is used as a foundation component in various ground stabilization and foundation reinforcement methods.

However, when the top block is laid in water with a water flow, after the water flow collides with the shaft leg,
Turbulent flow occurs behind the axle, and the turbulent flow may scour the ground, causing the coma block to tilt or fall.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an underwater top block in which turbulent flow is prevented or greatly suppressed when laid in water with a water flow. .

[0005]

In the following, referring to the reference numerals in the accompanying drawings, in an underwater top block 1 of the present invention, an inverted truncated cone shape or an inverted truncated pyramid shape having a circular or rectangular head 3 is provided. A shaft leg 7 having an elliptical, streamlined, or raindrop-shaped cross section is provided in the lower center of the body 2.

[0006]

In this underwater block 1, the shaft leg 7 embedded in the ground has an elliptical, streamlined or raindrop shape, so that the water flow will flow smoothly after colliding with the shaft leg 7. The generation of turbulent flow in the rear part 10 of the shaft leg 7 is prevented or significantly suppressed.

When the body 2 and the shaft leg 7 are separated, after the shaft leg 7 is driven into the ground, the body 2 is inserted into the connecting rod portion 9 of the shaft leg 7, and the connecting rod portion 9 and the body 2 are connected. Bonding material 13
To fix and integrate.

[0008]

1 and 2 show an embodiment of the present invention. In this embodiment, an inverted frustoconical body 2 having a circular head 3
A shaft leg 7 having an elliptical cross section is provided at the center of the lower part of the.
As shown in FIG. 1, the underwater top block 1 is installed with the major axis direction of the ellipse and the water flow direction aligned.

3 and 4 show another embodiment of the present invention. In this embodiment, a shaft leg 7 having a streamlined or raindrop-shaped cross section is provided in the lower center of an inverted truncated cone body 2 having a circular head 3. As shown in FIG. 3, the longitudinal axis of the streamline or raindrop shape is aligned with the direction of the water stream, and the water stream is installed so that it first strikes the wide portion of the streamline or raindrop shape.

5 and 6 show another embodiment of the present invention. In the present embodiment, an inverted truncated cone-shaped body 2 having a circular head 3 and a step portion 8 that abuts a lower end surface 4 of the body 2 are provided in an intermediate portion and are inserted into a vertical through hole 5 in a central portion of the body 2. A connecting rod portion 9 having an elliptical cross section protruding from the upper side of the step portion 8, and the connecting rod portion 9 of the shaft leg 7 is inserted into the vertical through hole 5 of the body 2, The lower end surface 4 of the shaft 2 is placed on the stepped portion 8 of the shaft leg 7, and the connecting rod portion 9 and the body 2 are fixed and integrated with a joining material 13.

7 and 8 show still another embodiment of the present invention. In the present embodiment, an inverted truncated cone-shaped body 2 having a circular head 3 and a step portion 8 that abuts a lower end surface 4 of the body 2 are provided in an intermediate portion and are inserted into a vertical through hole 5 in a central portion of the body 2. A connecting rod portion 9 having a streamlined cross section projecting from the upper side of the step portion 8. The connecting rod portion 9 of the shaft leg 7 is inserted into the vertical through hole 5 of the body 2, The lower end surface 4 of the shaft 2 is placed on the stepped portion 8 of the shaft leg 7, and the connecting rod portion 9 and the body 2 are fixed and integrated with a joining material 13.

9 and 10 show a top block 1 for underwater use.
An example of the laying method of is shown. A connecting raft 11 provided with a shaft leg insertion portion 12 is laid on the riverbed 16 serving as an installation surface as needed. When the body 2 and the shaft leg 7 of the underwater top block 1 have a separated structure, the shaft leg 7 is vertically inserted into the installation surface 16 in a state where the body 2 is not assembled, and then the vertical through hole of the body 2 is inserted. The body 2 and the shaft leg 7 are assembled by inserting the connecting rod portion 9 into the body 5.

By filling the gap between the outer peripheral surface of the connecting rod portion 9 and the inner peripheral surface of the vertical through hole 5 with a bonding material 13 such as cement mortar or synthetic resin, the body 2 and the shaft leg 7 are fixedly integrated. To be done. When the body 2 and the shaft leg 7 are integrally formed, the shaft leg 7 is vertically inserted into the installation surface 16. In any case, the top block 1 is installed in the direction as shown in FIG. 11 with respect to the water flow direction according to the sectional shape of the shaft leg 7.

A vertical reinforcing bar 14 and a horizontal reinforcing bar 15 are welded or bundled, if necessary, to the suspended reinforcing bar 6 which is embedded and fixed in the central portion of the upper surface of the head 3 of the body 2.
Are connected in a group. After this, as shown in FIG. 9, the foundation concrete 17 of the building such as the foundation of the jetty is provided on the block group.

FIG. 11 exemplifies the sectional shape and installation mode of the shaft leg 7 usable in the present invention.

[0016]

As described above, in the underwater top block 1 of the present invention, the inverted frustoconical or inverted pyramidal trapezoidal body 2 having the circular or prismatic head 3 has an elliptical, streamlined or raindrop-shaped cross section at the lower center. A shaft leg 7 of is provided, and in the case of an elliptical shape,
When laying so that the major axis direction coincides with the direction of the water stream and the streamline or raindrop shape is used, the longitudinal axis matches the direction of the water stream, and the wide portion of the streamline or raindrop shape flows first. The turbulent flow is prevented or significantly suppressed in the rear portion 10 of the shaft leg 7, and the water flow smoothly flows without being greatly affected by the shaft leg 7. Therefore, scour of the ground is prevented, and the top block 1 does not tilt or fall.

Further, if the body 2 and the shaft leg 7 are separated from each other, it is not necessary to prepare many kinds of integrally-molding frames for each different length of the shaft leg, and the cost can be reduced. When installing the top block 1, after the shaft leg 7 is driven into the ground, the body 2 is inserted into the connecting rod portion 9 of the shaft leg 7, and the connecting rod portion 9 and the body 2 are joined together by a joining material 13 By fixing and integrating with, the installation position can be easily determined and the workability of installation is improved.

[Brief description of drawings]

FIG. 1 is a front view of an underwater top block in which a body according to an embodiment of the present invention and a shaft leg having an elliptical cross section are integrated.

2 is a bottom view of the top block of FIG. 1. FIG.

FIG. 3 is a front view of an underwater top block in which a body according to another embodiment of the present invention and a shaft leg having a streamlined cross section are integrated.

4 is a bottom view of the top block of FIG. 3. FIG.

FIG. 5 is a perspective view of a disassembled state of an underwater top block in which a body according to another embodiment of the present invention and a shaft leg having an elliptical or raindrop-shaped cross section have a separated structure.

6 is a vertical cross-sectional view of an assembled state of the top block of FIG.

FIG. 7 is a perspective view of an exploded state of an underwater top block in which a body according to still another embodiment of the present invention and a shaft leg having a streamline or raindrop-shaped cross section are separated.

FIG. 8 is a vertical cross-sectional view of an assembled state of the top block of FIG.

9 is a longitudinal cross-sectional view of essential parts of a state where the underwater frame block group of FIG. 1 is laid.

10 is a plan view of the top block group of FIG. 9. FIG.

FIG. 11 shows the cross-sectional shape of the shaft leg and the direction of water flow in the embodiment of the present invention.

[Explanation of symbols]

 1 Underwater top block 2 Body 3 Head 4 Body lower end surface 5 Vertical through hole 6 Suspending rebar 7 Shaft leg 8 Step portion 9 Connecting rod portion 10 Rear of shaft leg 11 Connecting raft 12 Shaft leg insertion portion 13 Joining material 14 Vertical rebar 15 Horizontal rebar 16 Riverbed 17 Foundation concrete

Claims (2)

[Claims] 1. An underwater top block having an elliptical, streamlined, or raindrop-shaped axial leg 7 in the lower center of an inverted truncated cone or inverted truncated pyramidal body 2 having a circular or prismatic head 3. 2. An inverted frustoconical or inverted pyramidal truncated pyramid body 2 having a circular or prismatic head 3 and a step portion 8 which abuts a lower end surface 4 of the body 2 are provided in an intermediate portion, and upper and lower parts of a central portion of the body 2 are provided. A connecting rod portion 9 inserted into the through hole 5 and an axial leg 7 having an elliptical, streamlined or raindrop-shaped cross section which is provided above the stepped portion 8 in a projecting manner. Of the underwater body in which the lower end surface 4 of the body 2 is placed on the step portion 8 of the shaft leg 7 by inserting the connecting rod portion 9 of the body 2, and the connecting rod portion 9 and the body 2 are fixedly integrated by the bonding material 13. Mold block