JPS61106826A - Method of improving mortar-sprayed slope - Google Patents

Abstract

PURPOSE:To perform a safe and efficient work and to sharply reduce a construction cost, by a method wherein a mortar-covered layer is divided into given sized lots with a jet of water to remove the layer by way of each fractionized block, and cut grooves for vegetation are provided in a face of slope. CONSTITUTION:Longitudinal and lateral cut grooves 3 are provided in a mortar- covered layer 2, formed by spraying mortar on a face 1 of slope, by the use of a high pressure water injection nozzle. The covered layer 2 is parceled into a number of fractionized blocks 4 to peel the blocks from the face 1 of slope for conveyout. After the covered layer 2 is fractionized for removal, a number of cut grooves 5 are formed in the face 1 of slope for vegetation with a jet of water produced by high pressure water, and various vegetations are made in the grooves 5. This enables fractionizing of the mortar layer only by devices required for injection of high pressure water, and eliminates a risk of broken pieces of the mortar being splashed, resulting in the possibility to execute a safe work.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for dismantling and repairing slopes using mortar spraying.

``Prior Art'' Slope protection works using mortar spraying have been frequently implemented to protect steep slopes such as road cuts. In many of these existing slopes where mortar has been sprayed, the sprayed mortar covering layer has been destroyed by weathering, spring water, etc., and repair work must be carried out. For such slopes, it is necessary to dismantle and remove the sprayed mortar coating layer and apply new mortar or apply a vegetation greening method.

Conventionally, the mortar coating layer on a slope has been dismantled using a general demolition method that uses large machines such as hammering, but this method not only requires a large area to be occupied by the installation of large machines. During demolition, mortar fragments and other objects fly around, creating a dangerous situation, and as a result, traffic must be restricted or blocked during construction, and a solution to this problem was desired.

``Problems to be Solved by the Invention'' The present invention solves the drawbacks of the conventional method of dismantling and repairing slopes using mortar spraying, does not require the introduction of large machinery, and also eliminates the possibility of scattering debris during demolition. The present invention aims to enable the mortar coating layer to be dismantled and removed without any damage, and also to allow greening foundation work to be applied to the slope after the mortar coating layer has been removed.

``Means for Solving the Problems'' The present invention involves dividing the mortar coating layer applied to the slope into required sizes using jet water, and removing the mortar coating layer as finely divided blocks that are easy to transport. This method is characterized by cutting grooves for vegetation on the slope using jet water.

"Example" Hereinafter, an example of the construction method of the present invention will be described with reference to the drawings.

The construction method of the present invention is carried out on slopes covered with sprayed mortar, and is characterized by dismantling and removing the mortar coating layer and then applying vegetation foundation work for greening on the land. It has become.

Mortar deposited as protection for the slope 11
In dismantling the layers, it is necessary to subdivide them into easily transportable blocks. A major feature of this separation work is the use of jet water made from high aqua regia. In other words, if a high aqua regia spray nozzle is brought close to the location where the mortar coating layer is to be separated and high aqua regia is sprayed, the spray force will easily make a cut in the mortar coating layer with a width corresponding to the nozzle diameter. It is formed. As the injection nozzle is moved, the cut length becomes longer and the mortar coating layer is cut away.

Figures 1 and 2 show an example of cutting using a high-pressure water jet nozzle, in which grooves 3 are cut horizontally and vertically into a mortar coating layer 2 formed by spraying on a slope 1. ,3
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Thereby, the mortar coating layer 2 is divided into a large number of subdivided blocks 4.4. Note that the cut grooves 3.3 can be cut into a diagonal lattice shape or other suitable shape. The size of the block 4.degree. 4 is preferably such that it can be easily transported by lifting or lowering with a robe or the like. (Also, the only equipment required to cut the cut groove 3 is to install a power pump to send high aqua regia water, and a person can hold and operate the injection nozzle connected to this via a hose. In general, the slope for mortar spraying is quite steep, so it is safe and efficient to use lobes hanging from above the slope to protect the human body. Once the block 4 is divided into small blocks 4, each divided block 4 is peeled off from the slope and carried out.Each block 4 can be easily peeled off by inserting a tool into the cut groove 3 and prying it. The separated blocks 4 are tied together with lobes from above the slope, lifted above or below the slope, suspended, and then carried out by appropriate means.In this case, the blocks 4 are separated. It is best to carry out the removal from the top of the slope to the bottom.

After the mortar covering layer 2 has been dismantled and removed in this way, as shown in FIG. Similarly, it is removed using jet water using high aregia water. After cutting the groove 5, various vegetation works are applied to the groove 5 as shown in FIG. In other words, soil, fertilizer,
Vegetation material 6 mixed with water, seeds, and fibrous materials, adhesive materials, etc. as required is filled, and the vegetation material 6 is similarly applied to the surface of slope l. The shape of the groove 5 may be a long groove or a hole. The diameter, width, and depth of the groove are determined depending on the type of green grass plant and the geology, but in the case of a long groove, the width is generally 0.1 to 31 mm, and in the case of a hole, the width is 0.1 to 31 mm. It is preferable that the diameter is 1 to 10cR and the depth is 5 to 3ocIII.

There are various types of grooves 5 to be cut.
For example, when looking toward the slope, a large number of round grooves 5 are arranged at intervals as shown in Figure 5 (a), or horizontally long grooves 5 are arranged at intervals as shown in Figure 5 (b). Alternatively, the cross-shaped grooves 5 can be arranged as shown in (c) above, or the grooves 5 can be formed in a lattice shape as shown in (c), and furthermore, the grooves 5 can be formed in a lattice shape as shown in (b) to It is also possible to form a structure by combining them with each other.

"Effects of the Invention" As explained above, the construction method of the present invention divides the mortar coating layer applied to the slope into required sizes using jet water, and creates finely divided blocks that are easy to transport. After removal, we cut grooves for vegetation on the slope using jet water, so when dismantling or repairing the slope, removing the sprayed mortar coating layer is easier than before. There is no need to use large machinery such as the
The mortar layer can be dismantled using only the equipment and equipment required to spray high aqua regia, and the mortar coating layer can be dismantled safely and efficiently by jet water, reducing construction costs. It is greatly reduced. Moreover, the mortar coating layer has a small 2″t y ′
7 TZ f! r I! 9'r 1is 'Jr a
C * m t = 9952, so the work is not only easy, but there is no danger of mortar fragments flying around as in conventional construction methods, so the construction can be carried out safely, and the difficult problem of traffic interruption due to construction can be avoided. It will be canceled. Furthermore, on the slope where the mortar coating layer has been dismantled and removed,
By spraying jet water, grooves for vegetation can be drilled with high efficiency, making it easy to perform greening foundation work.
Mortar spraying has many excellent effects, including the ability to convert slopes to green slopes.

[Brief explanation of drawings]

The drawings show an embodiment of the construction method of the present invention; Fig. 1 is a side cross-sectional view showing the cut grooves cut into the mortar coating layer, Fig. 2 is a plan view of the same, and Fig. 3 is a cross-sectional view showing the cut grooves cut into the mortar coating layer. Figure 4 is a side cross-sectional view showing the state of greening construction, Figures 5 (a), (b), (c),
2) is a plan view illustrating various cutting modes of the cut groove for vegetation. 1... Slope 2... Mortar coating layer 3... Cut groove 4...
Block 5... Cut groove for vegetation 6...
Vegetation materials Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] The mortar covering layer on the slope is divided into required sizes using jet water and removed as easily transportable blocks, and then grooves for vegetation are cut into the slope using jet water. A method for repairing mortar sprayed slopes, which involves drilling holes.