JPS5820337B2 - 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 (
The construction method of reinforcing the ground by spraying mortar (hereinafter referred to as mortar, etc.), and using the formed structure as a base to create a base layer for plant growth and greening has been effective, but there are drawbacks such as the following. Ta.

B Since the formwork is formed on both sides, rebound (splashing material) such as low slump mortar discharged into the frame cannot escape outside the formwork, and mortar etc. It becomes like this (sand pocket), and in just a few years it becomes crumbly and weathered and loses the strength of mortar.

This means that even if the formwork is a wire mesh plate with large squares, most of the rebound that tries to escape outside the formwork will hit the wire mesh plate and be bounced back, even if it escapes at first. I glued it to a wire mesh board to prevent the grid from forming, and ended up with mortar that looked like foxtail.

Mouth: Since the formwork on both sides is not practical unless it adapts to the unevenness of the slope, it is necessary to create a special formwork, and in addition,
The formwork must be installed on the slope, requiring advanced technology, and the construction is time-consuming, making it uneconomical.

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

), and a large portion of the formwork on both sides rises above the slope, reducing the meaning of the formwork by half.

It is impossible to eliminate such unevenness of the slope, and it is practically impossible to implement this construction method.

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 rainwater that falls on the slope surface drains. At the bottom of the slope, water collects and washes away the base layer for plant growth.

Furthermore, even if the base layer for plant growth is formed using a bag, the bag must be strong enough to allow the plants to grow, so it will fall apart in a short period of time, and the plants will not be able to grow. The roots grow at a rate of about 10 crfL, and they intertwine in the same way as when planted in a pot, making them easy to fall off and be washed away by large amounts of rainwater.

The present invention was invented mainly in view of the above-mentioned drawbacks (41), and with particular emphasis on slope surface drainage (c), and its purpose is to stabilize the slope and improve the base layer for plant growth. The goal is to provide a construction method that can be used to form.

The structure of the present invention will be explained below by giving examples.

A wire mesh 1 having a mesh size of around 5 CrrL is stretched over the entire surface of the slope 31, and the wire mesh 1 is f9mm long and 30mm long at about 1 to 3m intervals.
Fixed with CrrL lath pin 2, and a width of 20Cr on the shoulder part.
fL, excavate a groove 32 with a depth of about 40 mm, wrap a wire mesh into the groove, and create an anchor 3 with a length of 16 mm and a length of 40 CrrL.
Drive in and fix.

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 made of rock, a hole may be excavated using a drill, an anchor may be driven in, or a rock bolt may be fitted into the hole, and mortar may be filled in the hole to secure the slope.

Next, reinforcing bars 5 at the front and back of f9 are placed in a grid pattern on the wire mesh in the area where the bulging body 4 is to be formed in a grid pattern using mortar or the like, for marking and reinforcement. stick.

Next, along the stretched reinforcing bars 5, a perforated plastic vibro (generally a water absorption pipe for dark water drainage) of f5 to 7 cIrL is installed from the slope at a distance slightly away from the reinforcing bars 5 toward the mountain side. The reinforcing bars are fixed so as to be lifted by about the same thickness, and each perforated vibro is connected with a cruciform joint pipe 7 at each intersection of the reinforcing bars.

The perforated pipe 6 is fixed by supporting it with anchors or the like at one to three locations at the joint portion and the intermediate portion of the joint so as to float it on the slope.

Further, it is desirable that the surface of the cruciform joint pipe facing the mountain side has a perforation.

Once the above work is completed, spray low slump mortar etc. along the reinforcing bars to make the upper end width 20crrL, the lower end (slope bonded part) width 30CrIL1 thickness 20Cr
The bulges 4 of about rL form a lattice frame of 1 to 2 m sections.

At this time, when spraying mortar etc. on the perforated part on the mountain side of the perforated pipe, be careful not to block the perforated part 8 with mortar etc.
A piece of gummed tape or the like is applied, and once the spraying of mortar or the like is completed, the gummed tape or the like is peeled off to open the perforation.

If the perforation of the perforated pipe is large, the part buried in the bulge may close the hole, so a perforated pipe without perforations may be used for the father-son part.

If necessary, a sand mat or the like may be placed in front of the perforation to prevent earth and sand from the plant growth base layer, which will be described later, from flowing through the perforation of the perforation pipe.

2 Next, on the slope where the lattice frame has been formed, except for the bulges, plant seeds suitable for the site, chemical fertilizers, park compost, organic fibers such as peat moss, soil conditioners, and vegetation base materials such as planting soil are applied. They are appropriately combined and mixed, and sprayed using a power sprayer to form a layer slightly thinner than the thickness of the swollen body to form the plant 1 growth base layer 9.

Depending on the situation, a film forming agent such as asphalt emulsion may be sprinkled over this, or a net 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 CrrL thick, and seeds located at the bottom will have difficulty germinating, so plant soil, organic fibers, compost, chemical fertilizers, etc. After spraying the vegetation base material, 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.

In the present invention, after a net-like body such as a wire mesh is stretched on a slope as described above, a lattice-like bulge is formed by spraying mortar, etc., and a perforated pipe is attached to the mountain side shoulder of the continuous bulge. This is a method of forming a lattice frame with perforated pipes embedded in it that can be used for greening, so even slopes that are difficult to green, easily collapse, and unstable can be stabilized and reliably greened. be able to.

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. In this state, the wire mesh and reinforcing bars do not rust when exposed to air, so the tensile strength is reinforced and a bulge can be formed, and they have particularly good adhesion to slopes, even on rocky slopes. It is possible to form a bulge that responds extremely well to unevenness.

- Also, the most important effect is that with conventional cast-in-place lattice frames, drainage was only considered to treat spring water, but what is needed is drainage of slope surface water due to rainfall, and the present invention A perforated pipe buried so as to open at the shoulder of the mountain side of the frame collects and removes water from the slope surface, so the surface water absorbed through the perforated pipe is stagnated by the pipe backburied within the bulge. The drainage is carried out at 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.

Furthermore, if a sand mat is placed in front of the perforated pipe, earth and sand will not flow in together with rainwater.

Furthermore, as described above, the present invention does not require special formwork, 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 that the slope surface can be formed at low cost and in a short period of time. If a base for stability and greening appears and plants grow within the lattice frame, a net is stretched at the bottom of the lattice frame, so roots can get entangled in the net and create a steep slope. It also has excellent effects, such as eliminating the risk of plants falling.

[Brief explanation of the drawing]

Figure 1 is a partial front view showing how to install reinforcing bars and pipes on top of a net-like material. Figure 2 is an enlarged front view of the intersection of the bulges, Figure 3 is a partially enlarged view of the intersection of the bulges seen from directly above, and Figure 4 is a partial enlarged view of the slope after implementing the present invention. FIG. In the figure, 1 is a mesh body such as a wire mesh, 2 is an anchor for anchoring the wire mesh, etc., 3 is an anchor for fixing the wire mesh, etc. wrapped around the shoulder of the slope, 4
is a bulging body, 5 is a reinforcing bar, 6 is a perforated plastic pipe, 7
8 is a cruciform joint pipe, 8 is a perforated portion of 6, and 9 is a plant growth base layer.

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 pattern from above the bulging body, 1. A method for draining a slope, characterized in that a perforated pipe is buried in a mountain shoulder so that a part of the perforated pipe is on the surface of a bulging body.