JPH07252813A - Foundation construction method preventing slide and settlement of structure in port and coast - Google Patents

Abstract

PURPOSE:To prevent foot protection blocks and wave dissipating blocks from sliding or settling with the scouring or liquefying of sea-bottom ground by waves, by using foot protection blocks with wires and round partition frames with rubble thrown in, in a structure in a port and a coast. CONSTITUTION:A reinforced concrete foot protection block 1 is connected to a shaped steel 4 by a wire 3 extended from a hook metal tool 2 fixed at the sideface of the block to install it on the bottom of the sea at the installation site. After a round partition frame 6 is installed adjacent to the foot protection block so as to press the wire 3 and the shaped steel 4, rubble is thrown into and between all the round partition frames 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a basic construction method for root blocks and wave-dissipating blocks used in ports and coasts.

[0002]

2. Description of the Related Art There are the following conventional basic construction methods. Root-fixing blocks Various types of root-fixing blocks have been developed to prevent the rubble mound from scattering, but none of them have been devised to prevent upper sliding, which is a small weight. Rubble construction method This construction method is a simple construction method in which rubble stones are simply put into the foundation of the wave-dissipating block. Stone basket method This method prevents rubble stones from scattering due to waves,
It is a method of wrapping rubble stones with a wire basket and then throwing them in. Sand mat method This method is a method of packing sand in a bag made of synthetic fiber and spreading it under the wave-dissipating block to prevent subsidence. Asphalt mat construction method This construction method is called asphalt mat and has a thickness of 5-8.
This is a method of laying a cm-shaped asphalt mat to prevent scour and subsidence. Train mat construction method In this construction method, 6 individual blocks are glued to a sheet made of synthetic fiber called a campus sheet, and the 6 blocks are intermeshed one after another to be joined together. It is a construction method that tries to prevent scouring and subsidence. Koma type block construction method This method is a method of installing the Koma type concrete blocks in series and trying to prevent subsidence by the support force unique to the Koma type blocks.

[0003]

The conventional method has the following drawbacks. (Refer to 1991 Minato Disaster Prevention No. 110, P24-P27) Conventional root blocks have not been devised to prevent subsidence and sliding, so subsidence from the tip block sequentially due to scouring and liquefaction of the seabed ground due to waves, It had the drawback of slipping and pulling it down to the dam body. In the rubble stone method, rubble stones scatter due to waves,
Sliding and subsidence of wave-dissipating blocks cannot be avoided due to the liquefaction of the seabed. Although the stone basket method can prevent scattering of rubble stones at the beginning of construction, it has the same drawbacks as the rubble stone method in which the wire net is torn by sandblasting or corrosion. The sand mat is damaged by repeated up and down movements due to waves in the part where the wave-dissipating block is not placed, and the sand mat plays a short period of time. Since the asphalt mat cannot withstand the concentrated load of the wave-dissipating block, it requires a stone basket and a covering block, and is expensive. In addition, subsidence occurs due to the liquefaction of the seabed, and the mat itself is long, so the workability is poor due to the influence of waves and tidal currents. (Proceedings of the 35th Coastal Engineering Conference 1988
(Refer to P402 to P406) Since the train mat has a densely connected structure of blocks, construction is impossible due to slight bad sea conditions such as waves and turbidity. Further, there are still problems such as a structure in which concrete blocks are spread and the structure is expensive, and the useful life of the campus sheet is uncertain. Problems remain, such as the coma block cannot be used as a basic construction method for a coast with deep water or a harbour, it takes time to install it, and it is expensive because it has a structure laid with concrete blocks. In the "Basic construction method for preventing sinking of wave-dissipating blocks and collapse of shape" published in Japanese Patent Laid-Open Publication (A) No. 4-27016 dated January 30, 1992, rubble stones will come out at the end of the connecting foundation frame. However, there are still problems such as the possibility of fear and the poor workability due to the difficulty in connecting the octagonal base frame.

[0004]

[Means for Solving the Problems] In order to achieve the above object, a rectangular rooting block is connected to the seabed at the laying position, and is connected to the seabed by a wire from a connecting metal fitting attached to the side surface on the short side. Connect to a horizontal section steel. Further, the present invention which has been solved by arranging circular partition frames in a zigzag pattern on this and putting rubble stones thereon and stacking wave-dissipating blocks thereon will be described in detail below.

In order to reduce the reflected waves due to waves, it is effective to incline the root block to reduce the block height toward the offshore side. For this reason, the weight of the tip portion becomes insufficient, and it is advisable to make several holes on the inclined surface of the block in order to prevent the block from rising due to lift pressure. On the other hand, a U-shaped connecting fitting is attached to the side surface on the short side opposite to the inclined surface, and the inclined surface is connected to the seabed at the laying position with the inclined surface offshore. A wire is attached to the U-shaped connecting metal fitting on the rear side of this, and a shaped steel is connected to the end of the wire to install it on the sea floor.

Further, a circular partition frame made by partitioning a circular frame made of reinforced concrete is manufactured, and this is contacted with the surface on which the connecting metal fittings of the root consolidation block are attached to press the wire and the shaped steel in a staggered manner. Set in a shape. In addition, it is advisable to manufacture the root block and the circular partition frame so that the weight is as large as possible within the range in which they can be constructed.

After the installation of the above-mentioned root block and the circular partition frame is completed, rubble stones are put in each circular partition frame and between the circular partition frames, but a smaller rubble stone is put in the lower part and a larger rubble piece is put in the upper part. And complete the foundation work.

[0008]

When large waves act on the substructure constructed as described above, scour and liquefaction occur in the seabed ground at the tip of the root block. Along with this, the consolidation block tries to slide offshore, but is pulled by a wire, so by sinking from the end to the unliquefied seabed ground, while preventing the rubble inside from coming out,
Prevent the liquefaction of the seabed from reaching the bank.

Further, when the wave-dissipating block is installed on the circular partition frame and the rubble, a load is applied to the circular partition frame, but since the inside and outside of the circular partition frame is filled with the rubble, the stress is dispersed and the circular shape is caused by the concentrated load. It is possible to prevent the break of the partition frame. In addition, like the “Kanjiki”, which was conceived to be able to walk on snow, the load is widely distributed on the seabed to prevent liquefaction and prevent subsidence.

Further, since the circular partition frame manufactured so that the weight is as large as possible in the workable range and the rubble in the inside integrally resist the load of the wave-dissipating block, the circular partition frame can slide without being connected. Good stability without.

The circular partition frame prevents the flow of water in the direction of the sea bottom between the rubbles, prevents the sand drift phenomenon on the bottom surface, and prevents the rubbles from scattering.

With the passage of time, the wave-dissipating block sinks in the circular partition frame, and the wave-dissipating block at the lowermost stage is fixed in the circular partition frame to form an integral structure, which prevents the breakage of the bank body.

[0013]

EXAMPLES Examples will be described with reference to the drawings.
In FIG. 1 and FIG. 2, a rectangular reinforced concrete block 1 made of reinforced concrete is attached to the side hanging metal fitting 2 to the wire 3.
It is connected to the shaped steel 4 by and is installed so as to be connected to the sea bottom at the laying position as shown in FIGS. 4 and 5. At this time, in order to reduce the weight per unit area of the root block, it was installed so that rubble could be put into the root block. The circular partition frame 6 is contacted with this rooting block as shown in FIGS. 4 and 5.
Are arranged in a staggered manner by pressing the wire 3 and the shaped steel 4. At this time, a small circular frame was installed between the circular partition frames in order to enhance the workability of the circular partition frames installed in contact with the root block. After this, rubble stones are put into each of the circular partition frames and between the circular partition frames, but a smaller rubble stone 7 is put in the lower part and a larger rubble stone 8 is put in the upper part, and the rubble stones and the circular partition frame 6 are erased. Install wave blocks. We conducted a model experiment with a two-dimensional water channel using such a basic structure and investigated the effect. As a result, with the passage of time, the rooting block sinks as shown in FIG. 5 to prevent the rubble from coming out, and the wave-dissipating block is fixed in the circular partition frame to form an integral structure and prevent collapse and sinking. The situation was observed.

[0014]

Since the present invention has the structure described above, it has the following effects.

By installing a rooting block fixed with a wire at the tip of a substructure of a harbor or a coast, it is possible to prevent the rubble inside from coming out and prevent the liquefaction of the seabed ground to reach the bank.

Since the circular partition frame has no directionality, it is not necessary to consider the installation direction, and since it is simply placed against the partition frame, the workability is good despite its large weight.

The combination of the circular partition frame and the rubble prevents the sand drift phenomenon on the bottom surface and scattering of the rubble due to waves,
The load is widely distributed over the seabed to prevent liquefaction and prevent subsidence. In addition, the structure has good durability and is economical.

As long as the construction is possible, the circular partition frame manufactured so that the weight is as large as possible and the rubble inside will integrally resist the load of the wave-dissipating block, so sliding will not occur even if the circular partition frames are not connected. Good stability without doing.

Since the circular partition frame and the wave-dissipating block become an integral structure and do not slide over time, it is possible to prevent the breakage of the bank body.

[Brief description of drawings]

FIG. 1 is a plan view of a root block.

FIG. 2 is a side view of a rooting block.

FIG. 3 is a perspective view of a circular partition frame.

FIG. 4 is a plan view showing a state in which a rooting block and a circular partition frame are laid.

FIG. 5 is a conceptual diagram of a subsidence state of a rooting block and a wave-dissipating block fixed to a circular partition frame.

FIG. 6 is a conceptual diagram showing a situation of subsidence when a root block is used as a submerged dike.

[Explanation of symbols]

 1 Consolidation block 2 Connecting metal fitting 3 Wire 4 Shaped steel 5 Partition frame 6 Circular partition frame 7 Small rubble stone 8 Large rubble stone

Claims (2)

[Claims] 1. A wire (3) is attached to a connecting metal fitting (2) attached to a short side of a rooting block (1) having a rectangular plane and a trapezoidal side, and a wire is attached to the end of the connecting metal. A basic construction method for preventing slippage of harbors and coastal structures that connects (4) and lays it horizontally on the sea floor. 2. A rubble stone (7) between a circular partition frame (6) made of reinforced concrete having a partition frame (5) and between the circular partition frames.
Basic construction method for preventing subsidence of harbor and coastal structures, characterized in that (8) was input and wave-dissipating blocks were piled on it.