JPH063002B2 - Pile type connection structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pile-type connecting structure used for a harbor structure such as a seawall, a breakwater, a sea berth, and a bridge, and an offshore structure.

《Prior art》 As a kind of port structure or offshore structure, concrete blocks are stacked and fitted on a plurality of pile pillars that are placed in the seabed at a predetermined interval, Pile-type connecting structures constructed by introducing stress or the like are known, and are disclosed in, for example, Japanese Patent Publication No. Sho 56-17484 and Japanese Patent Laid-Open No. Sho 60-10007. Even undersea ground, there is an advantage that it is not necessary to improve the ground.

However, such a pile type connection structure has the following problems.

<< Problems to be Solved by the Invention >> That is, in the pile type connection structure disclosed in the above publication, only the upper part of the structure is connected by a concrete block, and each of the bottom pillars is not connected. Instead, the structure was such that there was a difference in the behavior of each pile.

Therefore, when a strong wave force or seismic force acts on a structure, the structure behaves as a single structure rather than as a continuum, and these external forces cause a difference in the deformations of individual piles. As a result, stress tends to concentrate on the concrete blocks and specific piles, which are the only joints of the structures, and there is a problem with the resistance of these structures.

Further, in the structure of the above publication, since the pile pillars are only driven in the seabed, local scour is likely to occur around the piles near the sea bottom, and such scour and repetition Uneven settling / deformation of individual structures due to waves or the like is likely to occur. Even if such uneven settling / deformation occurs, it is expected that stress such as tension or bending will occur in the concrete block.

The present invention has been made in view of such conventional problems, and an object thereof is to increase resistance to external force and deformation by providing a bottom plate of a continuous body in a pile type connection structure. An object is to provide a pile type connection structure that can be formed.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention is a pile-type connecting structure constructed by stacking and fitting concrete blocks between pile pillars erected in the sea, A plurality of block bodies in which the pile pillar and the divided bottom slab installed on the seabed are integrally formed in advance on land, and the block pillar is inserted into the pile pillar located at a position close to the connecting portion of the divided bottom slab. And a casting pipe of a connecting material such as underwater concrete or mortar, the block pipe is transported to the sinking site and is then laid down, and then a form is appropriately installed and the casting pipe is placed between the adjacent divided bottom plates. It is characterized in that a connecting material is injected through the above and connected to each other to form a continuous bottom plate.

<Operation> According to the pile-type connecting structure having the above-mentioned configuration, the concrete blocks that are stacked and fitted are located on the upper side of the pile columns, and the continuous bottom slab that connects the divided bottom slabs is on the lower side. Since it is provided, the structure forms a three-dimensional frame structure that is connected at two places above and below the pile pillar, and it is possible for the entire structure to deal with strong external forces such as wave force, seismic force, and uneven settlement. Therefore, the stress concentration on the concrete block and the specific pile column on the top is alleviated.

In addition, since the pile type structure of the above configuration is integrally provided with a continuous bottom slab at the lower end of the pile column, local scour that occurs around the pile near the sea bottom in the conventional pile type connected structure is also possible. It can be prevented.

Further, since it is not necessary to penetrate the pile column into the seabed, the pile type structure can be easily constructed even on hard ground such as rock that is difficult to pile.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show an embodiment of a pile type connection structure according to the present invention.

In the pile-type connecting structure shown in FIG. 1, first, as shown in FIG. 1, a plurality of pile columns 10 made of steel or the like, which are erected in a grid pattern at appropriate intervals in the front-rear and left-right directions, Block body 1 integrally formed with a divided bottom plate 14 installed on the seabed 12
6 is produced.

The divided bottom slab 14 of the block body 16 is formed of, for example, concrete, and is manufactured on land such as a dry dock in the same manner as a bottom slab of a conventional concrete caisson or the like.

In this case, the lower end portion of each pile pillar 10 is embedded in the divided bottom plate 14, and the lower end portion of the pile pillar 10 and the divided bottom plate 14 are rigidly joined together.

Moreover, when the length of the pillar 10 is large, the divided bottom plate 14
When the concrete is placed, the pile column 10 is appropriately divided, and only the lower portion of the pile column 10 having an appropriate length is integrally formed with the split bottom plate 14, and after the concrete is placed, the upper side of the pile column 10 is added by welding or the like, You may make it obtain the required length of the pile pillar 10.

The size of the divided bottom slab 14 is determined in consideration of the hoisting ability and installation accuracy of the hoist ship, and the plane dimension thereof is determined. The reinforcing bars 15 are provided on the end faces of the divided bottom slab 14 in the connecting direction. .

In addition to the steel pipes, concrete piles, composite piles of steel pipes and concrete, and the like can be used as the pile columns 10.

Then, on the upper surfaces of the four corners of the divided bottom plate 14 of the block body 16, there are provided hanging metal fittings 18 which are used when the block body 16 is carried by a hoist ship.

In this case, the hanging metal fittings 18 are not only provided on the split bottom slab 14, but, for example, as shown by a dotted line in FIG. 1 (b), the pile pillars 10 are connected to each other by a frame 20 made of concrete or steel. The hanging bracket 18 may be provided on the frame 20.

The frame 20 can also be used as a support member for a concrete block that is laminated and fitted between the pile columns 10 after the block body 16 is installed locally.

On the other hand, as shown in FIG. 2, a casting pipe 22 of a connecting material such as underwater concrete or mortar penetrates into the pile column 10 and the divided bottom plate 14 which are located in the vicinity of the connecting portion of the divided bottom plate 14. is set up.

A hollow pipe is used as the casting pipe 22, and the lower end of the pipe is bent in the divided bottom plate 14 to open toward the connecting portion of the divided bottom plate 14.

When the production of the block body 16 described above is completed, the block body 16 is hung by the hoist ship via the hanging metal fittings 18 provided on the divided bottom slab 14 and transported to the submersion installation site.

Then, the crane of the hoist ship is operated to install the crane on the seabed 12, but when the seabed 12 is soft or when the ground is notable, ground improvement and leveling are performed in advance.

Further, after the block body 16 is installed, it is possible to reinforce the stability of the foundation portion by injecting mortar or the like between the lower surface of the divided bottom slab 14 and the seabed 12 if necessary.

When the installation of one block body 16 is completed, the above-described work is repeated, and a required number of block bodies 16 are installed while maintaining a predetermined space between the divided bottom plates 14.

Then, the divided bottom slabs 1 adjacent to each other after the block body 16 is installed
Underwater concrete (mortar) is injected into the connection portion between Nos. 4 and 14 through the casting pipe 22.

When injecting underwater concrete, the divided bottom plate 14,
Steel or concrete formwork 23 on the connection part of 14
Is installed.

The steel (concrete) formwork 23, in this embodiment,
A flat plate is used, and both ends thereof have holes slightly larger than the diameter of the pile column 10, and the divided bottom slabs 14, 14 which are adjacent to each other by inserting the holes into the pile 10 are used.
Is set on the upper surface of.

In addition, on the lower surface side of the steel (concrete) formwork 23, a connecting reinforcing bar that overlaps with the reinforcing bar 15 protruding from the end surface of the divided bottom plate 14 may be provided.

In addition, prior to placing the underwater concrete, the pile columns 10, 1
The concrete blocks 24 for connection between 0 are laminated and fitted using a hoist ship.

In this case, the concrete block 24 is preliminarily attached to the pillar 1
A through hole to be fitted to 0 is provided, and when installed in a predetermined state, prestress is introduced between the blocks 24 at an appropriate time to integrate the blocks.

When the above-mentioned preparation is completed, on the concrete block, the pump 25 for sending the connecting material is connected to the casting pipe 22, and the underwater concrete is poured into each connection portion of the divided bottom plate 14, whereby the divided bottom plate 14 is It becomes a continuous bottom slab connected by underwater concrete.

Now, in the pile type connection structure having the above configuration, the pile pillar 1
Since the concrete block 24 laminated and fitted between the pile columns 10 and 10 is located on the upper side of 0, and the continuous bottom plate in which the divided bottom plates 14 are connected by underwater concrete is provided on the lower side thereof. , The structure forms a three-dimensional frame structure that is connected at the upper and lower two places of the pile pillar 10, and it becomes possible for the entire structure to deal with strong external force such as wave force, seismic force and unequal settlement, Stress concentration on the upper concrete block 24 and the specific pile column 10 is relieved.

In addition, the pile type structure has a divided bottom plate 1 at the lower end of the pile pillar 10.
Since the bottom slab that connects the four is integrally provided, it is possible to prevent local scour that occurs around the pile near the sea bottom in the conventional pile-type connected structure.

Furthermore, since it is not necessary to penetrate the pile pillar 10 into the seabed 12, it is possible to easily construct a pile structure even on hard ground such as rock, which is difficult to pile.

<< Effects of the Invention >> As described in the above embodiments, according to the pile-type connecting structure according to the present invention, the concrete block and the divided bottom slab are connected continuously at the two upper and lower positions of the pile pillar standing up in the sea. Since it is connected with the bottom slab, it is possible to resist external environmental forces such as wave force and seismic force and uneven settlement, so that the stress concentration on a specific structural member can be reduced.

Further, since a continuous bottom slab is provided at the bottom of the pillar, local scour can be prevented.

[Brief description of drawings]

1 and 2 show an embodiment of a pile type connecting structure according to the present invention. FIG. 1 is a perspective view and a side view of a block body in which a pile pillar and a divided bottom plate are integrated, Figure 2 (a)
Is a cross-sectional view of the installed state of the block body, and FIG.
FIG. 2A is an enlarged cross-sectional view of the main part of FIG. 2A, and FIG. 2C is a plan view of FIG. 2B. 10 ………… Piles 12 ………… Seabed 14 ………… Bottom slab 16 ………… Block body 18 ………… Hanging metal fitting 22 ………… Casting pipe 23 ………… Steel mold Frame 24 ………… Concrete block

Claims (1)

[Claims] 1. In a pile-type connecting structure constructed by stacking and fitting concrete blocks between pile pillars erected in the sea, the pile pillars and a divided bottom slab installed on the seabed ground are preliminarily landed. A plurality of block bodies integrally formed with, and a casting pipe of a connecting material such as underwater concrete or mortar that is inserted into the pile pillar located at a position close to the connection portion of the divided bottom plate of the block body. After the block body is transported to the setting site and set down, a suitable formwork is installed, and a connecting material is injected between the adjacent divided bottom plates through the casting pipe to connect them to each other to form a continuous bottom plate. A pile-type connecting structure characterized by: