JP2001239990A - Construction method of launching slipway - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a launching slipway capable of shortening a construction time and enhancing construction accuracy of the launching slipway and a rail, and easy to maintain and control, when constructing the launching slipway sticking into the water from the land. SOLUTION: A launching slipway tip part 13 having a rail 4a laid on a float 14 and a slipway 15 above the float is constructed on the land area A. The launching slipway tip part 13 is tugged to the tip water area C of a launching slipway land part 23. It is then seated on the bottom 21 of the water at the launching slipway tip part by filling ballast on the float 14 of the launching slipway tip part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a launch ramp used when launching a large-scale structure such as a breakwater or a seawall caisson manufactured on land.

[0002]

2. Description of the Related Art Conventionally, when installing large structures such as breakwaters and seawall caisson made on land in a predetermined water area,
As one method, a large structure such as the breakwater or the revetment caisson is launched using a launch ramp that protrudes underwater from the land.

In this method, as shown in FIG. 5, a breakwater and a revetment caisson 1 are jacked up and a bogie 2 is made.
Then, it is lowered on the rails 4 laid on the launch ramp 3 using gravity to launch the water.

[0004] Therefore, unless the launch ramp 3 and the rails 4 are constructed or laid accurately, an accident may occur such as the truck 2 being derailed or the axle of the truck 2 being damaged. May be reached.

[0005] In addition, the launch ramp 3 and the rail 4 are functionally
Since it is constructed by projecting from the land A to the underwater B, the tip of the launch ramp 3 and the rail 4 is underwater civil engineering work. For this reason, it is difficult to accurately construct or lay the leading end of the launch ramp 3 or the rail 4. In addition, maintenance is difficult because the rail fixing block 5 laid under the rail 4 has unequal settlement and aging.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to construct a launch ramp projecting underwater from land.
Shortening the construction period, improving the construction accuracy of launch ramps and rails,
An object of the present invention is to provide a launch slope construction method that is easy to maintain.

[0007]

In order to solve the above-mentioned problems, a launching ramp construction method according to the present invention, when constructing a launching ramp that protrudes into water from the land, is laid on a floating body and a ramp above the floating body. After the tip of the launch ramp with the rail is built at the land, the tip of the launch ramp is towed to the tip water area of the land on the launch ramp, and then a ballast is stretched over the floating body at the tip of the launch ramp. It is characterized in that it is seated on the water floor at the tip of the land on the rising slope, which is previously leveled.

According to this construction method, the construction of the leading end of the launch slope and the leading end of the rail is civil engineering work on land.
The construction period of the launch ramp can be shortened. Also,
For the same reason, the construction of the launch ramp and the laying of the rails can be performed accurately. Furthermore, uneven settlement of the rail fixing block and settlement due to aging can be avoided.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of a leading end of a launch ramp during construction.
FIG. 2 is an explanatory diagram of the leading end of the launch ramp during towing, and FIG. 3 is an explanatory diagram of the leading end of the launch ramp after submerging.

First, as shown in FIG.
In the dry dock 12 partitioned by 1, the leading end 13 of the launching ramp is constructed. The launching ramp end portion 13 is mainly composed of a hollow wedge-shaped barge, that is, a hollow wedge-shaped floating body 14, and its inclined upper surface, that is, the ramp 15 is formed.
, A truck running rail 4a is laid. The wedge-shaped floating body 14 is usually made of reinforced concrete, but may be made of a steel plate if desired.

After the completion of the launch ramp 13, the water is injected into the dry dock 12 to float the launch ramp 13 and towed by the tugboat 30, as shown in FIG.

As shown in FIG. 3, since the seabed 21 on the extension of the land 23 on the launching slope is previously set on the foundation ground 22, it advances to the water area C at the tip of the land 23 on the launching slope. After towing the water ramp end 13, the launch ramp end 1
A ballast (not shown) is stretched in the floating body 14 of the third step, and the leading end 13 of the launching ramp is submerged, and the leading end 13 of the launching ramp is seated on the foundation ground 22.

After passing a side plate (not shown) over the rear end of the rail 4a at the leading end 13 of the launching ramp and the leading end of the rail 4b at the land 23 of the launching ramp,
Bolts and nuts (not shown) between side plates and rails 4a and 4b
To complete the launch ramp 3a that protrudes from the land A to the underwater B.

The launch ramp 3a is not limited to launching large structures such as breakwaters and seawalls, but can be widely applied to launching small and medium hulls, for example.

According to the above-mentioned construction method, since the construction work of the leading end of the launch ramp and the leading end of the rail is a civil engineering work on land, the construction period of the launch ramp can be shortened. Further, for the same reason, the construction of the launch ramp and the laying of the rail can be performed with high accuracy. Furthermore, uneven settlement of the rail fixing block and settlement due to aging can be avoided.

In the above-described leading portion 13 of the launching ramp, a floating body 14 and a ramp 15 on the upper surface of the floating body are integrally formed.
As shown in FIG. 2, a leading end 33 of a launching ramp that supports the ramp 15 with a number of columns 35 standing on a normal pontoon (floating body) 34 is also conceivable. Pontoon 3 at this time
4 may be made of steel plate or concrete. Rail 4a
Are laid on the ramp 15 in the same manner as in the first example.

The leading end 33 of the launching ramp is constructed by this method.
Movement is also possible. It is also possible to provide a system in which a hydraulic jack (not shown) is arranged below the rail to adjust the inclination angle of the ramp.

In addition, the construction of the launching slope end portions 13 and 33 is not limited to the dry dock, but may be performed on land other than the dry dock.

[0020]

As described above, according to the present invention, since the construction work of the leading end of the launch ramp and the leading end of the rail is a civil engineering work on land, the construction period of the launch ramp can be shortened. It became so. For the same reason, the construction of the launch ramp and the laying of the rails can be performed with high precision. Furthermore, uneven settlement of the rail fixing block and settlement due to aging can be avoided, and maintenance and management become easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a leading end of a launch ramp during construction.

FIG. 2 is an explanatory view of a leading end of a launch ramp during towing.

FIG. 3 is an explanatory diagram in which a leading end of a launching ramp is installed in front of a land portion of the launching ramp.

FIG. 4 is a side view of a leading end of a launch ramp using a normal pontoon.

FIG. 5 is a cross-sectional view of a conventional launch ramp.

[Explanation of symbols]

 A Land Onshore B Underwater C Launching Ramp Top Land Area 3 Launching Ramp 4a Rail 13,33 Launching Ramp Tip 14,34 Floating Structure 15 Ramp 21 Bottom of Launching Ramp Top Ramp 23 Launching Ramp Overland

Claims (1)

[Claims] When constructing a launch ramp protruding into the water from the land, a launch ramp having a floating body and a rail laid on the ramp above the float is constructed on the land, and then the launch ramp tip is constructed. A tow to the tip water area at the top of the launch ramp, and then ballast the floating body at the tip of the launch ramp to sit on the water floor at the tip of the land at the top of the launch ramp. Water slope construction method.