JPS5820335B2 - Law frame drainage method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for stabilizing slopes and also for greening slopes that are difficult to green due to rock formations or soft rock slopes where surface soil often flows out.

Conventionally, soft rock cut slopes, especially sedimentary soft rocks, are hard when dry, but when wet due to rainfall, etc., they tend to weather, making greening extremely difficult.

For slope greening, it is essential that the slope be stable and that there be a base layer for plant growth.

Various construction methods have been attempted for greening the above-mentioned sedimentary soft rock, but there have been few successful examples.Formworks are installed on slopes that meet the essential requirements for greening, and they are connected and assembled. Low slump mortar or concrete (
A successful construction method involves spraying mortar (hereinafter referred to as mortar, etc.) to reinforce the ground, and using the formed structure as a base to provide a base layer for plant growth for greening.

This construction method is disclosed in Japanese Patent Application Laid-open No. 51-94604 and Japanese Patent Laid-open No. 51-94604
This method was proposed in No. 124004 and Japanese Patent Laid-Open No. 51-133902, but it had the following drawbacks.

B Since the formwork is formed on both sides, the rebound of low slump mortar etc. discharged into the frame cannot escape outside the formwork, and the mortar etc. is trapped in the void containing the rebound. It becomes in a state similar to sand pockets, and in just a few years it becomes crumbly and weathered and loses its strength as mortar.

This means that even if the formwork is made of wire mesh plates with large squares, the rebound that tries to escape outside the formwork will hit the wire mesh plates and bounce back, even if a small amount escapes at first. It adheres to the board and prevents the grid, and ends up turning into mortar that looks like millet.

In addition, if the lattice becomes like this, if the formwork or reinforcing bars are installed inside the formwork, air will come into contact with the formwork or the reinforcing bars, and the reinforcing bars will rust and lose strength, leading to the collapse of the entire lattice frame. is a dog.

Mouth: Formwork on both sides is not practical unless it adapts to the unevenness of the slope, so it is necessary to create a special formwork, and in addition,
Since the formwork must be installed on the slope, it requires advanced technology and is labor-intensive, making it uneconomical.

In particular, many of the slopes to which this method is applied are made of rock, and it is difficult to properly shape the slope on rocky surfaces, resulting in extreme unevenness (parts with reverse slopes).

), the curved parts of the formwork on both sides rise above the slope, and the meaning of the formwork is halved.It is impossible to eliminate the unevenness of the slope, and in practice this construction method is not practical. is impossible.

C. Once the base layer for plant growth has been formed by adding soil or spraying organic materials, the only drainage measures taken are spring water treatment, so when it rains, the slope surface is washed away. The rainwater collected at the bottom of the slope washes away the plant growth base layer.Also, even if the plant growth base layer is formed by a bag, the bag does not have enough mesh and strength to allow plants to grow. Because the plants must be kept in a pot, they fall apart in a short period of time, and even if the plants grow, their roots can only grow by about 10 seconds, making them as entangled as in potted plants and easily falling off, and being washed away by large amounts of rainwater.

The present invention was invented mainly in view of the above-mentioned drawbacks of Iroha, with particular emphasis on slope surface drainage. It is on offer.

Slope 3 to explain the structure of the present invention by giving examples below.
1 to 5CrfL.

Stretch it on the surface, 1 place at 1-3m intervals, about $9mm long 3
Fixed with 0 precision Laspin 2, width 20CrrL on the shoulder part
A groove 32 with a depth of about 40 CrrL is dug, a wire mesh is wrapped in the groove, and an anchor 3 with f16 mm and a length of 40 CrrL is driven and fixed.

If necessary, wrap the wire mesh at the bottom of the slope in much the same way as at the shoulder of the slope.

If the slope is bedrock, drill a hole, drive an anchor or fit a rock bolt into the hole, and fill the hole with mortar to fix it.

In some cases.

Next, the reinforcing bars 5 after f9 are placed in a lattice pattern on a wire mesh to serve as a mark and reinforcement at the part where the bulging body 4 is to be formed in a lattice shape with mortar etc. and stick to it.

Next, use Mitufuta's joint pipe 7, which has a flexible vibro of f2 to 5 CrrL that fits along one direction of the stretched reinforcing steel, to the water intake port 8 of the joint pipe.
are connected to each intersection 9 of the reinforcing bars or one thorn intersection at appropriate intervals toward the top of the slope, and are fixed to the wire mesh using binding wires, wires, etc. .

In this case, the angle of the water inlet of the joint pipe is adjusted so that it is located above the plant growth base layer 10 or above the plant growth base layer, as shown in FIG.

Further, the angle of the lid portion 110 of the joint pipe varies depending on the intersecting angle of the lattice frame, and the length from the base of the lid to the tip of the water intake port is adjusted according to the width of the bulge.

Once the above work is completed, spray low slump mortar etc. along the reinforcing bars and spray the lower end (
Slope adhesion part) A lattice frame of 1 to 2 m sections is formed with the bulges 4 having a width of 30 crn and a thickness of about 20 crrL.

In this case, when spraying mortar, etc., the water inlet of the Joint Vibe is sometimes covered with a lid to prevent mortar from entering the water inlet.

Alternatively, you can make the length of the joint pipe from the base of the lid to the water intake port a little longer, and then cut it to an appropriate length once the spraying of mortar, etc. is completed.

Then, a sand mat 12 is placed in front of the water inlet to prevent the earth and sand of the plant growth base layer from flowing into the water inlet.

Next, on the slope on which the lattice frame is formed, the entire surface of the slope except for the bulge and the joint pipe water intake area is covered with vegetation seeds suitable for the site, chemical fertilizers, park compost, organic fibers such as peat moss, soil improvement materials, etc. The plant growth base layer 10 is formed by appropriately combining and mixing vegetation base materials such as soil, and spraying the mixture with a power sprayer to a layer slightly thinner than the thickness of the bulge.

Depending on the situation, a film forming agent such as asphalt emulsion may be sprinkled over this, or a net-like material such as polyethylene net may be stretched over it.

Formation of a plant growth base layer by spraying vegetation base material is approximately 10 cm'rrL thick, and seeds located at the bottom will have difficulty germinating, so plant soil, organic fibers, compost, and chemical fertilizers will be used. After spraying a vegetation base material such as fertilizer, seeds may be sprayed thereon either singly or in combination with the above-mentioned film forming agent.

In addition to the above method of forming a plant growth base layer by spraying, the greening method may include placing a vegetation bag or sandbag in a lattice frame.

As described above, the present invention stretches a net-like body such as a wire mesh on a slope, and then sprays mortar or the like to form a lattice-like bulge, and the continuous bulge has flexibility in one direction. A pipe is buried and a water intake port is projected outside the bulge toward the top of the slope at the intersection of the bulge to green the inside of the lattice frame. is also stabilized,
It can be greened.

The formed lattice frame is different from conventional cast-in-place lattice frames by removing the formwork on both sides, so the rebound that sometimes occurs when spraying mortar etc. does not accumulate in the bulge, and the eyes become clogged. Since the wire mesh and reinforcing bars do not rust when exposed to the air, their tensile strength is reinforced and a bulge is formed.They have particularly good adhesion to slopes, and can be applied to uneven surfaces even on rocky slopes. A very responsive bulge is produced.

In addition, the most important effect is that conventional cast-in-place lattice frames were only designed to treat spring water, but what is needed is drainage of slope surface water due to rainfall, and the present invention uses the lattice frame formed. The intersection of the two is the water collection point, and a joint pipe water intake port is protruded from the water collection location, so the surface water absorbed from the water intake port is not stagnated by the pipe buried inside the bulge. Drainage is carried out to the bottom of the slope or to the left and right sides of the slope, and the plant growth base layer within the lattice frame is not washed away.

In addition, a sand mat is placed in front of the water intake, so that dirt and sand will not mix with rainwater.

Furthermore, as described above, the present invention does not require any special shapes, and the lattice frame can be formed by a simple method of spraying mortar, etc. on the base of the wire mesh or reinforcing steel, so it is possible to form slopes at low cost and in a short period of time. Once a base of stability and greening has emerged and plants have grown within the lattice frame, a net is placed at the bottom of the lattice frame, so roots can become entangled in the net, allowing it to grow even on steep slopes. It has excellent effects such as no fear of plants falling.

Brief explanation of the drawings Figure 1 is a partial front view showing how to install reinforcing bars and pipes on top of the net-like material.

Figure 2 is a partial front view showing the completed lattice frame with bulges formed along the reinforcing bars.

Figure 3 is a partially enlarged view of the bulge body intersection seen from directly above.

FIG. 4 is a partially enlarged cross-sectional view.

In the figure, 1 is a net-like object, 2 is a small lath pin, 3 is a large lath pin, 4 is a bulge, 5 is a reinforcing bar, 6 is a pipe, 7 is a mitsufuta joint pipe, 8 is a water intake, 9 is an intersection, and 10 is a A plant growth base layer, 11 is a pipe lid part, 12 is a sand mat, 31 is a slope, and 32 is a slope shoulder groove.

Claims (1)

[Claims] 1. When forming a lattice-like bulging body of mortar or concrete by stretching a net-like body such as a wire mesh on a slope and spraying mortar or concrete in a lattice-like manner from above the net-like body, it is necessary to continue in one direction. A flexible pipe is disposed inside the bulge, and a water intake port is communicated with the pipe so as to protrude outside the bulge toward the upper part of the slope at the intersection of the bulge. This method is characterized by greening the inside of the lattice frame.