JP3008259B2 - Riverbed greening method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for greening a riverbed.

[0002]

2. Description of the Related Art When greening is performed by planting aqueous plants on the bed of a slowly flowing river, fish and microorganisms can grow and the environment of the river can be improved. However, especially in urban rivers, the riverbed was often contaminated to a certain depth by metals and the like flowing from the surroundings.

[0003]

Conventionally, there has been a method of solidifying a riverbed with concrete, but there has been no suitable method of greening the riverbed. In particular, there was no method of improving and contaminating polluted river beds in urban areas.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a riverbed greening method capable of economically greening a riverbed. Further, the present invention can make even a polluted riverbed harmless and economically green,
The purpose is to provide a river greening method.

[0005]

Means for Solving the Problems In order to achieve the above object, the riverbed revegetation method of the present invention collects riverbed sediments, classifies them according to particle size, and classifies the sediments into particles having a certain particle size or less. The material is mixed with a hardening material and put into a specific area of the riverbed and hardened to form a frame, and materials with a certain particle size or more are put into an input chamber surrounded by the frame. It features a greening method of the riverbed, which forms a vegetation base and grows seeds that flow into the vegetation base.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the riverbed greening method of the present invention will be described below in accordance with the order of construction with reference to the drawings.

<A> Collection of sediment. First, the current bed is dug down to a certain depth to collect the bed sediment. If the riverbed is contaminated by heavy metals, measure its depth and collect to that extent. The collected sediment is temporarily accumulated in a sedimentation site of a plant installed near the river. If the deposit is contaminated, the plant is mixed and washed with a neutralizing agent or the like corresponding to the contaminant.

<B> Screening. A vibrating screen or the like is provided in the plant, and the sediment is continuously supplied to the screen, and the sediment is classified according to the particle size. By classifying, as described later, it is divided into a frame forming material forming a frame and a base material serving as a base for growing vegetation. For this reason, the material is divided into a material having a smaller particle size and a material having a larger particle size.

<C> Assembling the formwork. Cut off some or all of the upstream side of the river to expose the riverbed. Then, the exposed riverbed is excavated to assemble the formwork 1. (FIG. 1) This form 1 is configured in such a manner that a part of the section is specified, similarly to a form in which concrete is generally poured on the ground. In the embodiment shown in the drawings, a case where the sections are formed in a grid pattern in a plane will be described. However, a free shape such as a circle, an arc, a triangle, a rhombus, or a Mickey Mouse or panda pattern can be formed.

<D> Formation of frame. For a material classified into a certain particle size or less by the screen, a hardening material is charged in a plant and mixed well to produce a frame forming material. Cement can be used as the hardening material in this case, but other known and commercially available materials can also be used. Then, the frame forming material is put into a region partitioned by the formwork 1 assembled on the riverbed. (In the embodiment of FIG. 1, the mold 1 is put outside the mold 1). Then, a frame 2 covering a certain range of the riverbed can be formed, leaving a large number of sections where concrete has not been put.

<E> Formation of vegetation base. A large number of coarse aggregate input chambers 3 are recessed in a state where a specific area of the riverbed is sectioned and surrounded by a hardened frame 2. Therefore, a material having a certain particle size or more classified in the previous step is charged into the coarse aggregate charging chamber 3. Thus, the coarse aggregate is charged into the coarse aggregate input chamber 3 surrounded by the frame 2, and the vegetation base 4 is formed.

<F> Greening. When the formation of the vegetation base 4 is completed, the deadline is released. Then, the running water of the river flows down in a state where the aggregate of the vegetation base 4 is exposed to the water surface, usually at a water level enough to cover the surface of the frame. The vegetation base 4 into which the coarse aggregate has been charged has the coarse aggregate having a certain particle size or more supplied uniformly. Therefore, there is not enough material with a particle size to fill the space between coarse aggregates,
Many spaces are formed between the coarse aggregates. Aqueous plant seeds and the like conveyed to the water stream flow into the space between the coarse aggregates with time, and adhere to the surface of the coarse aggregates. Alternatively, an appropriate seed can be selected and artificially sprayed to grow.

The periphery of the vegetation base 4 is surrounded by the frame 2, and the inside thereof is appropriately filled with a large number of coarse aggregates.
Even when the amount of water increases as in the case of a typhoon, the flow velocity of the river inside the vegetation base 4 can be appropriately suppressed. Therefore, the seeds of the aqueous plant adhered to the surface of the coarse aggregate gradually grow without being washed away. By the end of one season, the buds of a large number of aqueous plants are exposed from the water surface from the vegetation base 4 or the flowers can bloom to green the riverbed over a wide area.

[0014]

[Effect of the present invention] The riverbed greening method of the present invention is as described above, and the following effects can be obtained. <A> Classification of sediment dredged from the riverbed can be reused. Therefore, if a plant is constructed close to the river and classification and stirring operations are performed, most of the materials can be obtained without purchasing them from outside.
Therefore, it is extremely economical as compared with the conventional riverbed treatment method. <B> Even a riverbed contaminated by factory drainage or the like can be reused as it is by excavating it to a certain depth, adding various known chemicals, etc. in a mixing plant and simultaneously agitating the same. Even if the riverbed is contaminated in this way, it can be economically rendered harmless, and the riverbed can be constructed economically. <C> Coarse aggregate of a certain size or more is put into the space within the frame which is hardly affected by the flow velocity. Therefore, even if the amount of water increases as in the case of a typhoon, the flow velocity inside the vegetation base 4 can be appropriately suppressed. Therefore, the seeds of the water-based plants attached to the surface of the coarse aggregate can be gradually developed without being washed away, and by the end of one season, the buds are exposed from the water surface to beautifully green the riverbed over a wide area. Can be. <D> Because the frame is formed using the formwork,
The plane shape can be freely selected. Therefore, if various designs are applied to the shape and arrangement of the frame, it is possible to provide an interesting aesthetic to the citizens who observe from the top of the embankment or bridge by using the figure that slightly sinks below the surface of the water.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a construction order of a riverbed greening method according to the present invention.

FIG. 2 is an explanatory diagram of a construction order of a riverbed greening method according to the present invention.

FIG. 3 is an explanatory view of the construction order of the riverbed greening method of the present invention.

FIG. 4 is an explanatory view of a state where a vegetation base is completed.

Claims (2)

(57) [Claims] 1. Collect the sediment of the riverbed, classify it by the particle size, mix hardening material with the material below a certain particle size, put it into a specific area of the riverbed and harden it The greenery of the riverbed, which forms the frame and feeds the material with a certain particle size or more into the input room surrounded by the frame to form the vegetation base and develops the seeds placed on the vegetation base Construction method 2. Collecting riverbed sediments, classifying them by particle size, mixing cement as a hardening material for materials with a certain particle size or less, and putting it into a specific area of the riverbed to harden it. A bed is formed by letting a material having a certain particle size or more into the input room surrounded by the frame to form a vegetation base, and the seeds placed on the vegetation base are developed by growing seeds. Greening method