JPS5935644Y2 - caisson joint - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint between caissons used for reclaiming seas, lakes, and rivers (hereinafter simply referred to as the sea).

In the case of land reclamation in areas such as the sea, a large number of caissons are erected in series with their sides aligned in the sea, and the rows of caissons block off the sea side and the reclaimed side that leads to the land, and carry in soil and fill the reclaimed side. Land creation is done by draining seawater.

In this case, a caisson joint is installed between the caissons to prevent the leakage of reclaimed soil, but this caisson joint must not only have a sufficient watertight function, but also easily connect the caisson during underwater work. It must be able to easily absorb the positional error even if the caisson to be connected is erected out of the specified position, and the relative position between the caisson after the caisson is erected must be All conditions must be satisfied, such as being able to sufficiently follow displacement even if it occurs, and being able to withstand water pressure sufficiently.

Conventionally, as this type of caisson joint, one using a sand prevention plate as shown in FIG. 1, and one using a rubber tube as shown in FIG. 2 have been generally used.

That is, in the case of the caisson joint shown in Fig. 1, the caissons 1 and 1 to be connected are set up slightly apart from each other, and a flat sand control board 2 made of vinyl chloride is installed between them during underwater work. was fixed to the caissons 1 and 1 by pressing it with a holding plate 3 and hammering it with a dry pit 4, and then injecting and forming a backing made of griseite or the like to complete the joint.

However, since the shape is a flat plate, it has poor elasticity and may be damaged if displacement occurs between the caissons.Also, it is difficult to fix the sand control plate 2 to the caisson 1. It is not strong, and it is extremely difficult to do so.Since the sand control board 2 is made of vinyl chloride, its mechanical strength is low at % to % compared to rubber, and it gradually hardens due to the extraction of plasticizers, especially when cooled to below 5°C. There was a problem that it became brittle in cold weather.

In addition, in the caisson joint shown in FIG. 2, a recess 6 is formed in the center of the caisson body on one of the abutting side surfaces of the caisson 5 to be connected, and a rubber tube 7 is formed in the recess 6.
Flatten it and insert it, and after inserting, fill the rubber tube 7 with sand,
The rubber tube 7 was inflated into a round shape by press-fitting cement 8, etc., and the joint was completed by crimping the rubber tube 7 to the caissons 5, 5.

However, for caisson joints with this tank bottom,
Since there is a limit to the spread of the rubber tube 7, the caisson 5,
5. There was a serious problem in that gaps were likely to be formed due to the joint width at the time of installation and the displacement after installation, impairing the earth and sand outflow prevention function.

It is an object of the present invention to provide a caisson joint that eliminates all of the problems that existed in conventional caisson joints and also satisfies all of the conditions required for the above-mentioned caisson joints.

An embodiment of the caisson joint of the present invention will be described below with reference to the drawings.

3 and 4 show a caisson group to which the caisson joint of the present invention is applied, and FIG. 5 shows a cross-sectional state of the caisson joint.

In the figure, reference numeral 10 denotes a large number of concrete caissons arranged in series with their sides abutting each other.

A group of 10 caissons are installed in areas such as the sea where reclaimed land is to be reclaimed, cutting off the sea side and the reclaimed side.

Caisson 10 is usually made of concrete,
It may be a steel caisson or a composite steel and concrete caisson.

At the corner of each caisson 10 on the reclaimed side, a step 11 is formed by cutting out the corner into a step shape and extending in the height direction of the group of caissons 10 erected.

When the caissons 10 are arranged in series with the step portions 11 corresponding to each other, the caisson 10 is formed on the reclaimed side surface of the caisson 10 group and on the abutting portion of the caisson 10.
A recess 12 is formed extending in the height direction of the group.

In this embodiment, the bottom surface of the recess 12 is formed as a closed surface because the side surfaces of each caisson 10 are closely abutted.

In addition, the side of each caisson 10 shows the installed state of the caisson 1o,
Depending on the displacement after installation, a portion may come into contact with each other or may be in an open state without contacting at all, and the bottom surface of the recess 12 may be formed from an open surface.

On the other hand, the frame of the caisson 10 is provided with a fixing means 13 in advance.
An embedded plug is opened and embedded in the surface of the caisson 10 on the landfill side.

The embedded plug 13 has a screw bolt 14 on both sides and a threaded portion 14 on one end.
A protrudes from the caisson 10 and is screwed on.

A plurality of embedded plugs 13 are installed in a line in a row in the height direction of the caissons 10 at positions spaced apart from the stepped portion 11 by an appropriate distance.

By bolting the embedded plug 13 to the formwork in advance at a factory or the like, it can be securely and easily integrally fixed during the manufacture of the caisson 10, and the mounting position can be secured with sufficient accuracy.

A flexible member 18 made of an elastic material such as rubber or synthetic resin is provided at the caisson abutting portion of the caisson 10 group, spanning the adjacent caissons 10, 10 to be connected.

The flexible member 15 is composed of a central telescopic portion 15a and fixed portions 15b connected to both sides thereof.

The extensible portion 15a is formed to have a relaxed cross-sectional shape so as to be able to follow a large displacement, and is formed to have a U-shaped or wavy cross-sectional shape, for example.

The fixing portion 15b is essentially formed into a flat plate shape.
A thick inner portion 15c for preventing removal is formed near the end of the fixed portion 15b.

The thickness of the expandable part 15a is desirably formed to be smaller than the thickness of the fixed part 15b so as to be able to absorb large installation errors or relative displacements after installation between the caissons 10 and 10. For example, the thickness of the fixed part 15b is set to 6 mm.
In this case, it is desirable that the elastic portion 15a be formed to have a thickness of approximately 5 mm.

The flexible member 15 having the above configuration has an extremely simple shape and can be processed by extrusion, and is usually formed by extrusion.

The flexible member 15 has a reinforcing material (such as reinforcing cloth) inside.
It is desirable to bury a hole (not shown) in order to increase the strength.

The flexible member 15 has its telescopic portion 15a connected to the caisson 10°1.
0 is located in the recess 12 of the contact portion, and the fixed portion 15b
The caissons 10 and 10 are placed along the reclaimed side surface of the caissons 10 and 10 over the entire length of the caissons in the height direction.

The fixing part 15b is fixed to the caisson 10 by fixing the fixing part 15b to the caisson 10.
The threaded part 14a at one end of the double-threaded bolt 14 previously screwed onto the embedded plug 13 is inserted into the bolt hole drilled in the fixing part 1.
5b is held down by a holding plate 16, and a nut 17 is screwed into the threaded portion 14a.

In this embodiment, a double-threaded bolt 14 is attached to the embedded plug 13.
When fixing the flexible member 15, it is difficult to insert the bolt from the outside through the bolt insertion hole provided in the fixing part 15b and screw the bolt into the embedded plug. This is because it is easier to work by inserting the threaded portions 14a of both threaded bolts 14 provided protruding from the caisson 10 into the bolt holes of the flexible member 15 and the holding plate 16 and tightening them with the nuts 17. be.

Therefore, it is of course possible to fix the embedded plug 13 using a bolt having a general bolt head.

(Not shown) In addition, the fixing means 13 is not limited to the one in this embodiment, but by providing an anchor bolt on the caisson 10 as the fixing means 13 and using a retaining plate nut thereon, the fixing portion of the flexible member 15 can be fixed. 15b may be fixed.

(When shown) This fixing is easy to achieve even under the sea because there is no need to hit a dry pit during installation as in the case of conventional sand prevention plate installation, and it is sufficient to simply hold it down with the holding plate 16 and tighten the nut 17. be done.

Dry pits have weak fixing force, and there are also problems such as them hitting the reinforcement in the caisson 10 during construction and falling off, or coming off due to external force after construction, and problems such as incomplete fixation safety. However, with the fixing according to the present invention, this does not occur and the fixing can be performed firmly and reliably.

In this case, if one end of the flexible member 15 is fixed in advance to one side of the caisson 10.10 to be connected, the flexible member 15 only needs to be fixed at the other end during underwater work. It becomes even easier.

With the flexible member 15 fixed to the caisson 10, a backfill 18 of granite or the like is injected and formed on the reclaimed side of the caisson 10 group.

This backing 18 has the function of supporting, preventing deformation, and protecting the flexible member 15, and by forming the backing 18, the caisson 1
Formation of the 0 group and caisson joints is completed.

The caisson joint having the above configuration operates as follows.

First, regarding the effect of preventing earth and sand from flowing out, since the fixed part 15b of the flexible member 15 is crimped to the caisson 10 by the embedded plug 13, both threaded bolts 14, and the retaining plate 16 and nuts 17, both the caissons 10 and 10 to be connected. The watertightness between 10 and 10 minutes is maintained sufficiently, and the outflow of earth and sand can be sufficiently prevented.

In this case, the flexible member 15 may try to bulge and deform toward the landfill side due to water pressure, but since the backfill 18 is formed on the landfill side, the deformation of the flexible member 15 is prevented, and the water pressure is also suppressed. Supported.

Regarding the displacement absorption capacity, since the central extensible part 15a of the flexible member 15 is formed in a shape that can be easily deformed to a large extent, even if there is an error in positioning between the caissons 10 and 10 when the caisson 10 is installed, this will not be affected. Flexible member 1
5 can be installed along and fixed, and after the caisson 10 is erected,
Adjacent caisson 10 due to water pressure, earth pressure, ground displacement, etc.
Even if a relative displacement occurs between 10 and 10 minutes, it will follow the displacement and deform without difficulty, easily absorbing the target displacement, and sufficiently maintain the function of preventing earth and sand outflow.

The recess 12 formed at the abutment area of the caisson 10.10 accommodates the extensible part 15a of the flexible member 15 and provides a space that can be easily deformed. Since the recess 12 is left by the portion 11.11 and the telescopic portion 15a of the flexible member 15 is accommodated in the recess 12, the flexible member 15 is bitten between the caisson 10.10 and the flexible member 15 is excessively It will not be compressed and damaged, and even if the caisson 10.10 is installed at a distance,
By deforming the extensible portion 15a, the flexible member 1 can be easily
5 can be attached to the caisson 10.10.

Regarding the assembly operation of the caisson joint, the flexible member 14 can be easily, reliably, and safely attached to the caisson 10.1 in the sea.
It can be fixed to 0.

After applying the caisson joint having the above structure and function to the 10 groups of caissons, land reclamation is carried out by dredging or the like on the land reclamation side.

When using the caisson joint of the present invention, fixing means such as an embedded plug or anchor bolt is attached in advance, and the caisson joint is formed with a step at the corner. A large number of flexible members are arranged in series in correspondence with each other, and between adjacent caissons, a flexible member having an extendable part in the center and fixed parts on both sides is placed, the extendable part is located in the recessed part, and the fixed part is set as an embedded plug or a flexible member. Since the caisson joints are fixed and straddled using fixing means such as anchor bolts, it is possible to assemble the caisson joints extremely easily, reliably, and firmly underwater without the need for dry pit driving as in the past. It is a highly reliable caisson joint that can easily absorb installation errors during installation and easily attach flexible members to caissons, and can absorb relative displacement between caisson over a very wide range after installation. can be provided.

In addition, since the extendable part is located within the recess, the flexibility of deformation of the extendable part is ensured and the displacement absorption capacity can be increased. Damage to the flexible member due to associated excessive compression can also be prevented.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a caisson joint using a conventional sand-proof board, Fig. 2 is a plan view of a caisson joint using a conventional rubber tube, and Fig. 3 is an overall plan view of a caisson group according to the present invention. 4 is an elevational view of a caisson group according to the present invention, and FIG. 5 is a sectional view of an embodiment of the caisson joint of the present invention. The symbols in the figure indicate the following. 10... Caisson, 11... Stepped section, 1
2... Recessed portion, 13... Fixing means, 14
...Both threaded bolt, 14a... Threaded part, 15... Flexible member, 15a... Telescopic part, ... Fixed part, 18... ... Back-packing. 15b...

Claims (1)

[Scope of utility model registration request] The abutting parts of the caissons, whose sides correspond to each other, are provided with recesses that extend in the height direction of the caisson and are formed by cutting out the corners of the caisson in a step-like manner. It is equipped with a fixing means consisting of an embedded plug or an anchor bolt, and between the caissons is a rubber or synthetic material having an elastic part with a U-shaped cross section in the center and flat plate-shaped identification parts on both sides. A flexible member made of resin is fixed by locating the extensible part in the recess, aligning the fixing part along the caisson surface, and screwing a fastening means such as a bolt or nut onto the fixing means. , a caisson joint characterized by being straddled.