JPH0161131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cast-in-place method for constructing slopes to prevent collapse of slopes.

Generally, sloping structures are used to protect slopes that exceed the standard slope.

The method of constructing a concrete block can be roughly divided into concrete block constructing and cast-in-place concrete constructing, and the present invention is directed to the latter.

In other words, in conventional concrete slope construction, both formworks 5 are constructed facing each other on the slope as shown in Fig. 4.
are arranged to intersect vertically and horizontally, and after reinforcing inside both formworks 5, concrete is poured into both formworks 5 to form a shotcrete slope.

However, the conventional slope construction using both formworks 5 has the following problems.

<B> If there are floating stones or boulders on the slopes of both formworks 5 where concrete is to be sprayed, they can be easily removed before the reinforcing bars are placed, but it is difficult to remove them after the reinforcing bars are placed, so remove the boulders. etc. were not sufficiently removed.

This reduces the quality of the sprayed concrete.

<B> Since the installation interval between both formworks 5 is relatively narrow, when concrete is sprayed, both formworks 5
The coarse aggregate tends to rebound when it hits the inside of the concrete.

As a result, coarse aggregate floats up from the mortar, air pockets occur, and the required strength cannot be obtained in many cases.

<C> If the slope on which both formworks 5 are arranged has ups and downs, a gap will occur between the lower ends of both formworks 5 and the slope. For this purpose, the lower ends of both formworks 5 had to be cut off or a new net had to be added, making it difficult for both formworks 5 to cope with the unevenness of the slope.

The present invention has been made to improve these points, and an object of the present invention is to provide a concrete method for constructing a concrete frame that is excellent in workability, ability to follow slopes, and economical efficiency.

Next, an example will be described.

<1> Net body The net body 1 is a belt-shaped wire mesh formed by intersecting vertical members 11 and horizontal members 12.

As the mesh body 1, not only a known wire mesh but also a frame made of synthetic resin, a punched steel plate, expanded metal, etc. can be used.

<2> Connection material A connection material 2 is used to connect the net bodies 1 to 1. The connecting member 2 is composed of a horizontal bar 22 and a vertical bar 23. The ends of the crossbars 22 are each bent into an annular shape to form a ring 21. The inner diameter of the ring 21 is the vertical member 1
1, and is configured to be rotatable around the vertical member 11 and to allow loose movement. (FIG. 1) A plurality of horizontal bars 22 are attached to the same vertical member 11.

As a result, the net body 1 is wound around the vertical members 11, approaches each other, and becomes foldable. Furthermore, a plurality of vertical bars 23 are arranged and fixed on one side of a horizontal bar 22 that communicates between the mesh bodies 1 so as to be orthogonal to the horizontal bar 22. (Fig. 1) That is, the connecting member 2 is connected to the net body 1 by the horizontal bar 22.
The vertical members 23 not only communicate between the two, but also constitute a part of the reinforcing bars during reinforcement arrangement, as will be described later.

In addition to the above-mentioned steel rod, a synthetic resin net may be used as the connecting member 2.

However, in the case of a synthetic resin net, there is no need to separately arrange the vertical bars 23.

Next, the construction method will be explained.

<1> Transporting the frame A rotatable connecting member 2 is connected between the net bodies 1 and 1.
Since the net members 1 are connected by , it is possible to bring the net members 1 close to each other and fold them.

Therefore, a group of multiple nets can also be folded and stored into a thin plate-like body and transported in the folded state.

<2> Deployment of the frame (Figure 2) Net 1 folded upon arrival at the site
It is pulled apart and deployed on the slope in the transverse direction of the slope.

When the nets 1 at the ends are pulled, the nets 1 are connected by connecting members 2, so they are pulled out one after another and unfolded on the slope.

Each net body 1 has some play in the connecting portion with the connecting member 2, so that it is allowed to turn in the direction of the slope, and when the slope has undulations, it follows and responds to these undulations.

Therefore, there is no need for repair work such as adding a new net to the bottom of the net body 1 as in the conventional case.

After a large number of nets 1 are spread out on the slope in a direction across the slope, anchors 6 are driven into the slope at appropriate intervals in contact with the nets 1 or the connecting members 2 and fixed.

<3> Reinforcement work The formwork used in the present invention is one in which concrete is sprayed using one side of the mesh body 1, instead of using the two inner sides of both formworks facing each other as in the conventional method.

Therefore, the reinforcement is only placed on one side of the mesh body 1.

That is, a plurality of long reinforcing bars 3 are arranged in parallel with the net 1 above the slope of each net 1. In other words, the horizontal bar 2 connecting the reinforcing bars 3 between the mesh bodies 1
2 and intersect with the vertical bar 23.

The locations where the reinforcing bars 3 and the vertical bars 23 intersect are bound using known binding wires.

The reinforcement width of the reinforcing bars 3 is freely determined depending on the condition of the slope at the site.

Since the reinforcing bars 3 are not placed over the entire area between the mesh bodies 1, but only on a part of one side of the mesh body 1, there is a gap between the reinforced reinforcing bars 3 and the mesh body 1 above them. There is enough space left for workers to easily reach.

Therefore, if there are floating stones or boulders on the slope within the three groups of reinforcing bars, they can be easily removed by entering the space.

<4> Spraying of concrete, etc. (Fig. 3) After completing the reinforcing bars 3 work, spray low-slump concrete or mortar only on one side of the mesh body 1 where the reinforcing bars 3 are arranged.

Concrete spraying is done on the installed net 1
Because the spacing between the two meshes is wide, one mesh body 1
It can be sprayed directly to the reinforcement area without being aware of its existence.

Therefore, there is no fear that the sprayed aggregate will rebound, and a predetermined strength can be obtained without creating spaces such as air pockets.

As a result, a concrete beam 4 having a fan-shaped cross section can be formed at the corner of the net 1, sandwiched between the slope and the net 1.

In other words, only the lower side of the concrete that hangs down is securely held by the mesh 1, so there is no need for formwork, etc. on the upper side, and experimental work has shown that only supporting the lower side is sufficient. found.

Note that the molding width a of the concrete beam 4 is freely determined according to the condition of the slope at the site, as shown in FIG.

<5> Soil and vegetation Between the 4 concrete beams, use soil as it is, fill it with soil, or pour soil mixed with edging seeds and fertilizer to cover the slope, and then tighten it with soil pouring, etc. Harden it and complete the construction of the legal framework.

Since the present invention is as explained above, the following effects can be expected.

<1> If there are floating stones or boulders on the slope after reinforcing, you can easily remove them by inserting your hand from the side of the group of reinforcing bars, so it is possible to maintain the best conditions. Concrete can be sprayed.

<2> When spraying concrete, instead of spraying into the two formworks installed at narrow intervals as in the past, it can be sprayed directly towards the reinforcing bars, reducing the risk of aggregate rebound. Ta.

Therefore, the aggregate can be driven into the mortar and maintain a predetermined mix strength.

<3> Since the connecting portions of the connecting members that communicate between the nets are configured to have some play to allow turning in the direction of the slope, it can sufficiently cope with some undulations on the slope.

<4> If a concrete beam is formed on a slope, the width of the concrete beam is limited to the width of the formwork when both formworks are used as in the past, but in the present invention, the concrete beam is formed by spraying onto one side of a single mesh. Therefore, the molding width can be changed freely depending on the condition of the slope.

<5> When installing a net on a slope, it is enough to unfold a plurality of folded nets, and the formwork can be completed in a short time.

<6> Since construction is performed on only one side of the mesh, the cost of the mesh can be cut in half compared to conventional forms that use both forms.

<7> During reinforcement work, it was difficult to place reinforcement inside both formworks as it was restricted by the formwork on both sides, but when placing reinforcement only on one side, Since it is open, reinforcement work becomes easier and construction efficiency improves.

[Brief explanation of drawings]

Fig. 1: An explanatory diagram of the connecting portion between the net body and the connecting material, Fig. 2: An explanatory diagram when the frame is expanded, Fig. 3: An explanatory diagram when concrete is sprayed, and Fig. 4: An explanatory diagram of a conventional example. 1: Net body, 2: Connecting material, 3: Rebar, 4: Concrete beam.

Claims (1)

[Scope of Claims] 1 A plurality of nets are connected by a connecting member with some play, and a group of the nets is separated by the distance of the connecting member and a large number of nets are arranged in a direction across a slope. A slope construction method in which nets are placed in parallel and concrete is sprayed onto the upper side of the slope of each net.