JPH0563579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for laying adjacent flexible mats for underlaying underwater structures such as caissons.

[Problems to be solved by conventional technology and invention]

Generally, when constructing structures such as breakwaters or underwater structures that are subject to large external forces, asphalt pine is laid on the underwater foundation mound to prevent these structures from sliding, and underwater structures such as caisson are placed on top of it. I have to.

The above-mentioned pine is manufactured on land, but no matter how big the construction equipment is, it is actually impossible to make the pine all as one piece. Therefore, there is always a problem of joints between the pine and the adjacent pine. The current solutions to this problem include (1) the overlapping method and (2) filling the joints with asphalt. However, in the overlap method (1), if the pine is thick, the overlapped joint will swell up significantly, creating a large step at the joint. If this level difference is too large, a large stress will be generated locally in the underwater structure such as a caisson placed on it, which may damage the structural members, which is not preferable. In addition, the method (2) of filling with asphalt has problems with workability under deep water and cannot be adopted.

[Means for solving problems]

The present invention has been made to solve this problem, and when a plurality of flexible mats are laid one after another under deep water, each mat is provided with a support wire insertion hole. First, pass a support connection wire of sufficient length through the support wire insertion hole of the first pine, attach floaters to each end of the wire, and then use a hanging frame to move the first pine to a desired position under water. Next, remove the floater at one end of the above-mentioned auxiliary connecting wire and pass it through the hole of the second mat, and install a stopper that engages with the auxiliary wire insertion hole in the middle, and then suspend this second mat. First using the frame
The floater side of the auxiliary connecting wire is rolled up, a second pine is laid adjacent to the first pine, the floater is removed and the stopper side is rolled up to create the auxiliary connecting wire. The gist of this invention is a mat laying method characterized in that the mats are pulled out from holes in first and second mats laid adjacent to each other.

〔Example〕

The auxiliary wire insertion hole of the mat used in the present invention is pre-molded when the mat is manufactured, but this is done by forming a flexible mat 1 made of asphalt, rubber, synthetic resin, or other material, as shown in FIG. 1, for example. When molding, cut out a recess 2 on the top surface near the end surface.
It is made by providing gas pipes 3 which pass through the end faces into the recesses 2 and opening respectively, and burying in advance angles 4 for reinforcing the end faces of the gas pipes 3.

To lay the above-mentioned pine under water, as shown in FIG. 2, the pine 1 is successively laid on a mound 6 previously created under water using a hanging frame 5 suspended from a crane such as a ship on the sea.

When suspending the mat 1 on the mound 6 as described above, as shown in FIG. Floaters 8 are attached to both ends of 7.

By doing this, the mat 1 through which the wire is inserted can be suspended over the mound 6 with the floaters 8 at both ends of the wire floating on the sea.

Therefore, as shown in FIG. 4, the next mat 1' is suspended by the above-mentioned hanging frame 5, and at this time, one of the floaters 8 of the wire 7 is removed, and the wire 7 on the side from which this floater 8 was removed is connected to the mat 1'. After the wire 7 is passed through the support wire insertion hole, a stopper 9 that can be engaged with the support wire insertion hole is attached to the middle of the wire 7 on the side where the wire 7 has passed, as shown in FIG. Next, mat 1' is suspended into the sea and stopped just before reaching mound 6.

Thereafter, as shown in FIG. 6, when the wire 7 on the floater 8 side is slowly wound up with a winch as shown by the arrow, the stopper 9 engages with the insertion hole of the mat 1' and joins it to the mat 1. be able to.

When the mats 1 and 1' have been connected and installed in this way, the floater 8 of the wire 7 is removed and the wire 7 on the stopper 9 side is pulled up as shown in FIG. Only the wire 7 can be pulled out from the mats 1, 1' without causing damage, and the work is completed.

By sequentially applying this method and order to the third, fourth mats 1'', 1, . . . , a large number of mats can be laid adjacent to each other on the mound.
In addition, as a means to ensure the connection of the mats 1 and 1', the present invention can be achieved by forming vertically staggered joints 10 and 10' on the joint end surfaces of the mats 1 and 1', as shown in FIG. This is useful in practice.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view of the main parts of the pine used in carrying out the present invention, Fig. 2 is an explanatory view showing the above pine being suspended into the sea, and Fig. 3 is an explanatory view showing the wire passing through the first pine. Fig. 4 is an explanatory drawing when passing the wire through the mat shown in Fig. 2, Fig. 5 is an explanatory drawing when attaching the stopper to the wire, Fig. 6 is an explanatory drawing when the first and second mats are mounted. FIG. 7 is an explanatory diagram showing the mats being laid on top of each other, FIG. 7 is an explanatory diagram showing the completion of laying the mats together, and FIG. 8 is an illustrative diagram of the joint structure of the mats. 1, 1'... Mat, 2... Recess, 3... Gas pipe (insertion hole), 4... Angle (reinforcement), 5... Hanging frame, 6... Mound, 7... Supporting connection wire,
8...Floater, 9...Stopper, 10...
Coupling, 11...Floating crane.

Claims (1)

[Claims] 1. When laying a plurality of flexible mats one after another in water, a support wire insertion hole is formed in each of the mats, and first, the length is sufficient for the support wire insertion hole in the first mat. The first mat is then laid at a desired position under water using a hanging frame, and the second mat is passed through the hole, and the second mat is passed through the hole. A stopper that engages with the hole is attached, and then this second pine is suspended close to the first pine using a hanging frame, and the connecting wire is wound up to bring the second pine into contact with the first pine. 1. A method for laying a mat, the method comprising the steps of: rolling up the stopper side and pulling out the supporting connecting wire from the hole of each of the first and second mats laid adjacent to each other;