JPS6354091B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a mechanically advantageous embankment on soft ground.

In recent years, the number of cases in which embankments such as breakwaters and sea walls are constructed on soft ground at the bottom of the water has increased, but in such cases, the ground is generally improved in advance to ensure the stability of the embankment. . However, this method ensures that deformation of the embankment does not become a problem even in the case of temporary structures such as partitioned temporary revetments and temporary cofferdams that have a relatively short service life or are permanent structures. It was extremely uneconomical when it came to things.

The present invention provides a method for constructing a simple embankment body that does not require prior ground improvement as in conventional methods and can easily control end bearing pressure and artificially suppress ground reaction force. An example of this will be described below with reference to the drawings.

In the method of the present invention, a block structure S having a substantially mountain-shaped cross section as shown in FIG. 1 is used. That is, 1
1 is a longitudinal bulkhead that forms the front surface of the embankment body, and side plates 4 that intersect with the bulkhead 1 are attached to both side edges of the bulkhead 1 to form housing portions 5a and 5b on both the front and rear sides of the bulkhead 1. Earth retaining plates 3 parallel to the partition wall 1 are attached to both ends. Reference numeral 2 denotes a bottom slab that is in contact with the lower ends of the partition wall 1, the side plates 4, and the retaining plates 3. A partition plate 6 whose front and rear ends are connected to the partition wall 1 and the earth retaining plate 3, respectively, is provided in both the accommodating parts 5a and 5b.

The partition wall 1 does not necessarily have to be installed vertically, but may be installed so as to be inclined toward either one of the earth retaining plates 3, and it is not limited to a planar structure, but can also be formed into a bent surface. Furthermore, the partition wall 1 is designed so that it can be pulled out as a partition wall when the front and back sides of the partition wall 1 are reclaimed.
A guide may also be provided at the joint portion of the partition plate 6 with the partition wall 1. The shape of the bottom slab 2 or the planar shape of the side plates 4 and retaining plates 3 is not limited to a rectangular shape, but can be formed into various shapes depending on the topography as shown in Fig. 3 A to C. 2 may be extended to the outside of the retaining plate 3, and the bottom plate 2 is not necessarily required, and the structure S may be driven or embedded in a mound 8, which will be described later. Further, in order to reduce the stress on the partition wall 1 as the front surface of the embankment body, the upper end portions of both side plates 4 may be extended so as to contact the upper end portions of the side edges of the partition wall 1.

The chevron-shaped block structure S constructed in this way can be molded from various materials such as concrete, reinforced plastic, steel, and wood.
An asphalt mat or the like may be placed on the lower surface of the holder to increase the sliding resistance.

Next, a method of constructing an embankment body using the above structure S will be explained with reference to FIG. 2. First, a mound 8 is constructed on a predetermined soft ground under water by a conventional method, and the structure S is sunk and placed on the mound 8 with the bulkhead 1 facing toward the sea. In this case, move this structure S to mound 8
To transport it to the location, either hook the crane hook onto the hanging piece 7 attached to the upper end of the bulkhead 1 and suspend it.
A method is adopted in which the accommodating parts 5a and 5b are made watertight and then floated on the water surface and towed. Note that when the structure S is not provided with the bottom slab 2, the lower part of the structure S is driven into the mound 8, or as shown in FIG.
The lower part 8a of the mound is first created and the structure S is placed thereon, and then the upper part 8b of the mound is created and embedded in the mound 8.

When sinking the structure S on the mound 8, if there are waves from the sea side and the structure S is unstable due to wave pressure against the bulkhead 1, the structure S should be placed on the sea side. Lower half 5a- in part 5a
1 (if the wave pressure is large, further up to the upper half 5a-2), the end bearing pressure of the submerged structure S is averaged by filling with earth, sand, rubble, etc. in advance or at the same time as the submergence. Further, when there are no waves, the lower halves 5a-1 and 5b-1 of the accommodation sections 5a and 5b on both the sea and land sides are filled to average and stabilize the end bearing pressure of the structure S.

Next, the back surface of the bulkhead 1 is filled, and at the same time, the upper half 5a-2 of the sea-side storage section 5a is also filled, so that the end bearing pressure is averaged against the load on the structure S due to the filling. be.

The construction method according to the present invention is extremely simple as described above, and the housing portions 5 on both the front and rear sides of the block structure S
A counter such as filling earth and sand is loaded in the housing portion 5a or 5b in order to equalize the end bearing pressure with respect to the acting direction and acting force of the load on the structure S due to wave pressure or land reclamation. This controls the amount of filling inside.

Therefore, according to the method of the present invention, the bulkhead 1 of the structure S, which is to become the front surface of the embankment body, can be easily stabilized on the mound 8, and there is no need for special ground improvement in advance. Therefore, if it is applied to a simple embankment body such as a partition wall, it can be constructed extremely economically and quickly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a block structure used in an embankment construction method using a chevron-shaped block according to the present invention;
2 and 4 are construction explanatory views, and FIG. 3 is a plan view showing another type of block structure. Description of symbols, S...Block structure, 1...Partition wall, 2...Bottom slab, 3...Earth retaining plate, 4...Side plate,
5... Accommodation section, 6... Partition plate, 7... Hanging piece,
8...Mound.

Claims (1)

[Claims] 1. A block structure consisting of a roughly mountain-shaped cross section with containing sections formed on both front and rear sides of the bulkhead that forms the front of the embankment body is sunk on a mound built on the underwater ground, and rubble, earth, etc. are placed in the above mentioned containing sections. A method of constructing an embankment body using a mountain-shaped block, characterized in that the end bearing pressure is averaged against the wave pressure and the load due to subsequent reclamation through filling, and then reclamation is performed on the back side of the bulkhead.