JPS60156826A - Protection work of slope surface and net-bag used therefor - Google Patents

Abstract

PURPOSE:To unnecessitate the water outlet port of the titled bag by a method wherein, a weight is provided at the underpart of a net bag with porosity through which aggregates do not pass through, and after the net-bags are juxtaposed along the slope surface being located under wate level, then underwater concrete is poured from the upper part of said net-bags. CONSTITUTION:After a weight 3 made of concrete is fixed on a ring 2 of a net- bag 1 whose porosity is the extent that aggregates do not pass through, e.g., 10-12mm. mesh, those net-bags are juxtaposed along the water-level slope of an artificial island 8 and the like a using crane 11. As the next step, an underwater concrete with viscous material and viscous accelerator being added thereto is poured into the net-bags 1 through injection pipe 10 and injection hole 6. At this time, because water contained inside of the net-bags leaks out through net meshes, water outlet port is unnecessitated to be provided.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a slope protection method for preventing erosion of the slope of an artificial island created by reclaiming sand and gravel, or the slope of a river, and its use therein. It concerns net bags.

[Prior art]

Conventionally, as a construction method for slope protection, it is already known that sand or concrete is placed in net bags and placed side by side along the slope, but in the case of the sand bag mat method, the sand is placed in mesh bags. In addition to requiring a fine mesh to prevent water from flowing out, since it is waterproof, it is necessary to provide a water outlet at the tip of the net bag to allow water to escape from the tip when filling with sand, which reduces the cost of the net bag itself. In addition to this, this sand bag mat has the problem that the bag erodes after a long period of time and the sand inside comes out.

Another method is known in which concrete is placed in a mesh bag instead of sand, but in the case of ordinary ready-mixed concrete, when it comes into direct contact with water, the cement, sand, and aggregate separate, resulting in poor quality. Because concrete could not be poured, the tip of the pipe that supplied concrete from the concrete pump was inserted up to the tip of the net bag, and the pipe was gradually pulled upwards while pouring concrete. There was a problem in that the construction required time and effort.

Particularly in recent years, slope protection work is often carried out in deep water or in places with severe sea conditions, and there is a need for a slope protection method that is easy to perform and capable of forming concrete of the highest quality. .

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, the present invention provides a slope protection method that solves the problems of the conventional slope protection method using net bags, reduces the cost of the net bags, and allows easy pouring of high-quality concrete, and the net bags used therein. It was made with the purpose of providing.

[Structure of the invention]

141, the revetment construction method of the present invention is a net bag with a mesh that does not allow bone tissue to pass through. The net bag used in the So-O construction method, which is characterized by being filled with concrete, has a mesh that does not allow bone tissue to pass through, and a weight is installed at the bottom of the bag, and the top end of the net bag has a filling port for underwater concrete IJ-t. It is constructed by attaching the .

〔Example〕

The present invention will be described in detail below with reference to the drawings. First, the elongated net bag 1 used in this seawall construction method in Embodiment 1 of the present invention shown in FIG. 1 is made of nylon. The thickness is set to such an extent that the bone phase constituting the underwater concrete filled in the concrete does not pass through, for example, 10 to 12 mm.

Next, below this net bag 1, a reinforcing bar hook 4 fixed to a concrete weight 6 as shown in FIG. 1 is connected to a weight fastening/rig 2 as shown in FIG. By tightening, a weight 6 is provided, and several sleeve reinforcements 4 are provided at the same place on the middle circumferential surface of the net bag 1, and these are connected to vertical reinforcing wires 5.
are connected as shown in Figure 2.

Furthermore, an underwater concrete filling port 6 is attached to the upper end of the net bag 1, and a lifting ring 7 is also provided.

In addition, although the above-mentioned Example 1 shows a single type net bag 1, the net bag 1 can be used as a double type, or in some cases a triple type, etc., as in Example 2 of Fig. 3, where the same parts are indicated by the same part numbers. It can also be formed.

The underwater concrete that is filled from the filling port 6 at the upper end of the net bag 1 is made of cement, sand, bone, etc. that have been viscous, swelled, and dried, and does not separate in water.

Next, to explain the slope protection method using the net bags 1 of Example 1 and 2, shown in Figure 4, the empty bags are placed on the artificial island 8 where slope protection is to be carried out using a hoist boat 11. After transporting the net bag 1 with a weight 6 at the bottom end (= J-shaped) and landing the weight 8 on the bottom of the artificial island 8 at a predetermined position as shown in Figure 5, Installed along the quay of Island 8,
Thereafter, underwater concrete is filled into the filling roller of the net bag 1 via a filling pipe 10 from an underwater concrete supply device 9 consisting of a concrete mixer and a concrete pump installed on land, and the bank protection work is completed.

[Effect]

As mentioned above, the mesh of the mesh bag 1 of the present invention is rough enough to prevent bone tissue from passing through, so the water in the mesh bag 1 can easily escape, so there is no need for a water outlet below the mesh bag 1 as in the conventional case, and underwater concrete is not required. Since the concrete 1 is used for one bag, the concrete 1 does not separate in water, and a high-quality concrete pillar can be formed, and there is no need to waterproof the net bag 1, and an inexpensive one can be used for the net bag 1.

Moreover, since underwater concrete is used, when filling underwater concrete, a simple operation of supplying underwater concrete through the filling port 6 is sufficient.

Furthermore, since the reinforcing ring 4 is provided on the middle circumferential surface of the net bag 1, only the lower part of the net bag 1 is prevented from expanding excessively during filling, and a concrete column with a uniform diameter is formed.

〔Effect of the invention〕

Therefore, if the present invention is adopted, high-quality concrete can be poured using low-cost net bags, and the efficiency of slope construction can be improved and construction costs can be reduced. The present invention is extremely effective in carrying out slope protection work in places with severe weather conditions.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the net bag of Example 1 of the present invention, FIG. 2 is a perspective schematic sectional view of the net bag of FIG. 1, FIG. 3 is a perspective view of the net bag of Example 2, and FIG. 4 , FIG. 5, and FIG. 6 are a series of explanatory diagrams of the slope protection method of the present invention. 1...Net bag, 6...Double line, 4...Reinforcement ring, 6
...Filling port, 9...Underwater conocrete supply device, 1
0.・Filling vibe. Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Patent Attorney Kazuhiko Saishita Figure 6

Claims (1)

[Claims] 1. A weight is provided below a mesh bag having a mesh that does not allow the aggregate to pass through, the mesh bags are placed side by side along a slope underwater, and the mesh bag is placed underwater from above. A slope protection method that is filled with concrete. 2. A slope with a weight installed below a net bag with a mesh that does not allow aggregate to pass through, an underwater concrete filling port attached to the upper end, and a reinforcing ring provided on the middle circumference of the net bag. Net bags used for protection methods.