JP2004161548A - Method of producing wood chip concrete for spraying - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent clogging in a hose of a shotcrete machine. <P>SOLUTION: In a method for producing the wood chip concrete for spraying, the wood chips provided are sorted out with a vibration sieve (step 101) in the first instance. The maximum size of the wood chips sorted, that is, the mesh opening of the vibration sieve is determined by appropriately considering the inner diameter of the hose of the shotcrete machine. For example, a preferable maximum size is about 25 mm. After sorting the wood chips, the sorted wood chips are fed together with water, cement and other materials for kneading into an mixer, e.g. a soil mixer being an open-type mixer, and kneaded so as to obtain the wood chip concrete for spraying (step 102). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing wood chip concrete for spraying which is sprayed on a slope mainly for the purpose of greening.
[0002]
[Prior art]
On slopes found in embankments and cuts, road embankments, river embankments, etc., it is necessary to prevent slope erosion, delamination, and falling rocks by protecting them with appropriate means. .
[0003]
As a method of slope protection, spraying concrete or mortar is known as a typical method, but recently, in order to consider the environment, slope protection by greening has been increasingly adopted. It was.
[0004]
As a method of protecting the slope by greening, it is common to spray a vegetation substrate made of an aqueous slurry in which plant seeds, fertilizer, water, chip material, adhesive, and the like are stirred and mixed, on the slope. According to the above, after spraying on the slope, the roots of the plants sprouted after a certain period of time spread into the inclined ground, and the inclined ground can be stabilized.
[0005]
However, in this method, in order to firmly fix the plant, the vegetation base material must be sprayed more than a certain thickness, which is expensive.
[0006]
Therefore, recently, a technique for spraying wood chip concrete as a base of a vegetation base material has been developed (see Non-Patent Document 1).
[0007]
[Non-Patent Document 1]
Obayashi Corporation, Technical Index, [online], [Search September 24, 2002], Internet <URL: http: // www. obayashi. co. jp / technology / index / index. html>
[0008]
[Problems to be solved by the invention]
Wood chip concrete is a structure in which a large number of wood pieces are solidified together with a cement-containing substance so that gaps are formed between the pieces of wood, and can be replaced with a part of the vegetation base material in terms of fixing the plant. . In addition, because it has a certain drainage property, even if acid water leaches out from the soil on the back side, the acid water is drained through the wood chip concrete, and there is no concern that it will adversely affect the vegetation base material. A part of the water can be supplied to the vegetation substrate, and the excess can be drained. And since a plant extends its root so as to sew a gap between pieces of wood, there is no concern that its growth is hindered.
[0009]
However, such pieces of wood are not only those that have been thinned or thinned out for the purpose of recycling thinned wood, but also those that are crushed and crushed for the purpose of simple disposal. And many of such needle-like wood pieces are relatively long.
[0010]
For this reason, there has been a problem that a long piece of wood is caught in the hose of the concrete sprayer and the inside of the hose is clogged.
[0011]
The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a method for producing wood chip concrete for spraying that can prevent clogging of a hose of a concrete spraying machine.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, according to the method for producing sprayed wood piece concrete according to the present invention, a plurality of pieces of wood are cemented together with cement so that gaps are formed between the pieces of wood. A method for producing wood chip concrete for spraying, wherein the wood pieces are selected with a sieve so that their maximum dimensions are not more than a predetermined dimension, and then the selected wood pieces are kneaded with water, cement or other required kneading materials. To do.
[0013]
In the method for producing blown wood concrete according to the present invention, first, the wood pieces are selected with a sieve so that their maximum dimensions are equal to or less than a predetermined dimension.
[0014]
Next, the selected piece of wood is kneaded with water, cement and other required kneading materials.
[0015]
If it does in this way, a piece of wood will be arranged below the maximum dimension, and if this maximum dimension is set up appropriately, there will be no possibility that it will get stuck in the hose of a concrete sprayer.
[0016]
That is, if sorting is performed as described above, a piece of wood having a length exceeding the maximum dimension remains on the sieve, so that only a piece of wood that is not likely to be clogged in the hose can be selected.
[0017]
In addition, it is preferable to carry out a two-stage sorting as required. In this case, in addition to the above-described selection of the maximum dimension or less, the selection of the minimum dimension or more is performed.
[0018]
In the above-described invention, when the production of sprayed wood chip concrete has been completed, after transferring this to a concrete spraying machine, the wood spraying concrete is sprayed onto the slope with the concrete spraying machine, and the wood chips are removed from them. What is necessary is just to form the wood chip concrete layer solidified mutually so that a predetermined | prescribed space | interval may be formed in between on a slope, and to make it the foundation | substrate of a vegetation base material.
[0019]
The method for producing wood chip concrete for spraying according to the present invention will be referred to comprehensively as wood chip concrete for spraying for convenience not only in the case of fresh concrete but also in the case of using cement milk or fresh mortar.
[0020]
That is, regarding kneading wood pieces, water and cement, the present invention is not intended to exclude other kneading materials, and in addition to the case where wood pieces, water and cement are used as kneading materials, Thus, a case where a fine aggregate is added as a kneaded material or a case where a coarse aggregate is further added as a kneaded material is also included. Specifically, when wood pieces, water and cement are used as kneading materials, the wood pieces are kneaded with cement milk (cement paste), and when fine aggregates are added as kneading materials, the wood pieces are kneaded with fresh mortar. In addition, when adding coarse aggregate as a kneading material, the piece of wood is kneaded with fresh concrete.
[0021]
In order to accelerate the setting and hardening of the cement, for example, it is optional to add a non-chlorinated admixture mainly composed of lignin sulfonic acid and a rhodan compound.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a method for producing sprayed wood chip concrete according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.
[0023]
FIG. 1 is a flowchart showing a procedure of a method for producing sprayed wood piece concrete according to the present embodiment. As shown in the figure, in the method for producing wood chip concrete for spraying according to the present embodiment, first, the procured wood pieces are selected with a vibration sieve (step 101).
[0024]
The maximum size of the piece of wood to be sorted, that is, the opening of the vibrating screen may be appropriately determined by taking into account the inner diameter of the hose of the concrete sprayer, for example, about 20 mm to 30 mm, particularly about 25 mm.
[0025]
In addition, it is desirable to perform two-stage sorting as necessary. In this case, in addition to the above-described sorting below the maximum dimension, sorting above the minimum dimension, for example, sorting of about 5 mm to 10 mm is performed.
[0026]
Thus, if it sorts with a vibration sieve, the piece of wood exceeding the maximum dimension will remain on a vibration sieve. And if it says in the above-mentioned example, only the piece of wood whose maximum dimension is 25 mm or less will pass a vibration sieve.
[0027]
When the sorting of the wood pieces is completed, the sorted wood pieces are put together with water, cement and other necessary kneading materials, for example, into a soil mixer, which is an open-type mixer, and kneaded to obtain sprayed wood piece concrete (step 102). .
[0028]
The manufactured wood chip concrete for spraying can be used for slope planting in the following procedure.
[0029]
That is, first, the manufactured wood chip concrete for spraying is conveyed to a concrete spraying machine by a belt conveyor and put into a hermetic compressor of the spraying machine.
[0030]
Next, as shown in FIG. 2, the wood chip concrete 10 for spraying is ejected from the nozzle of the concrete sprayer and sprayed onto the slope 21.
[0031]
In this way, a wood piece concrete layer 22 in which a gap 23 is formed between the wood pieces 9 is formed on the slope 21.
[0032]
Next, waiting for the cement milk 24 in the spraying wood piece concrete 10 to harden, and then spraying the vegetation base material 25 onto the wood piece concrete layer 22, the slope 21 can be greened.
[0033]
Here, a detailed procedure example for kneading the selected wood pieces with the kneading material described above will be described below. The following procedure is an example of a kneading procedure between a piece of wood and water, cement or other required kneading material, and is not limited to such a procedure. In short, the piece of wood and the other kneading material are uniform. It may be kneaded.
[0034]
As an example of the kneading procedure, first, as described above, a large number of pieces of wood are put into a soil mixer, which is an open-type mixer, and are kneaded. If it does in this way, many wooden pieces can be disperse | distributed uniformly in a soil mixer, and uneven distribution in a soil mixer can be prevented.
[0035]
Next, water and cement are simultaneously charged into a soil mixer, and then kneaded with the previously charged wood pieces. If it does in this way, during kneading | mixing of a piece of wood and cement, not only cement but water will also exist, and this water will play the role which reduces the frictional resistance of the pieces of wood by cement. For this reason, when the wood pieces and cement are agitated, there is no concern that the wood pieces will jump out of the soil mixer, thus eliminating the need for an operator to suppress the wood pieces from popping out, and as a result, the efficiency of the agitation work is improved. It is possible to shorten the entire construction period of the attaching work.
[0036]
Water and cement may be weighed in a measuring tank in a necessary amount, and these may be added, for example, in the form of cement milk.
[0037]
When weighing water and cement, it is necessary to form a gap between pieces of wood after the produced spraying concrete has been sprayed and the cement milk is hardened. It is desirable to mix poorly with respect to the amount, and to stir and mix so that cement milk adheres around the wood pieces in a soil mixer. That is, if there is too much cement milk, there will be less gaps between the pieces of wood, and if there is too little cement milk, the strength of caking the pieces of wood will be insufficient, so the blending ratio of wood pieces and cement milk will take this viewpoint into account. And decide as appropriate.
[0038]
Next, a thickener is added to the soil mixer and re-kneaded to obtain wood chip concrete for spraying. When the thickener is added in this way, the wood pieces and the cement milk are not separated, and the wood pieces can be consolidated through the cement milk so that a gap is formed between them. Therefore, it is possible to form the wood chip concrete layer well according to the work schedule, and it is thereby possible to reliably spray the vegetation base material, which is a subsequent process, according to the work schedule.
[0039]
In addition, the concrete layer (mortar layer, cement layer) becomes sloped by hardening when the gap between the pieces of wood is completely filled with cement milk, or only the cement milk separated from the material is cured on the slope. It is possible to avoid the situation such as covering, so that the nutrients and moisture of the back soil are smoothly supplied to the vegetation substrate, and at the stage of growing to some extent, the plant has its roots. By extending to the backside soil, nutrients and moisture can be absorbed from the backside soil and can grow smoothly.
[0040]
In addition, when an ethylene vinyl acetate emulsion is used as a thickener, not only the separation resistance between cement milk and wood chips, and thus the above-mentioned effects resulting from this, become more prominent, but also in the process of emulsification, it becomes an environmental hormone. Because it does not use substances such as phthalic acid that may have an impact as additives, it is also environmentally superior. In addition, even if a large amount of tannin that delays the hydration reaction of cement milk is contained in the wood pieces, the wood pieces and the cement milk are not separated for a long time, so that a gap is formed between them. It becomes possible to solidify reliably through cement milk.
[0041]
About re-kneading after thickener addition, it is desirable to make it as short as possible in order to prevent clogging in a concrete sprayer, in other words, to add a thickener just before completion | finish of all the stirring processes.
[0042]
As described above, according to the method for producing wood chip concrete for spraying according to the present embodiment, the wood pieces are sorted by a sieve so that their maximum dimensions are equal to or less than a predetermined dimension, and then the sorted pieces of wood are separated. Since kneading with water, cement and other required kneading materials, the pieces of wood will be aligned below the maximum dimension, and if the maximum dimension is set appropriately, there is no risk of clogging by being caught in the hose of a concrete sprayer. .
[0043]
In the present embodiment, as a detailed example of kneading, the wood chip prior addition and the addition of a thickener have been described. However, as described above, these are merely examples of the kneading procedure, and the wood piece and other kneading materials are simultaneously used. It may be kneaded and whether or not a thickener is added is also arbitrary. Further, the mixer for kneading need not be an open mixer, and a batch-type closed mixer may be used.
[0044]
Further, in this embodiment, the pieces of wood generated from the crusher are targeted for selection, but instead of or in addition to this, the pieces of wood chipped for the purpose of recycling thinned wood, waste wood, etc. are selected. It doesn't matter.
[0045]
【The invention's effect】
As described above, according to the method for manufacturing wood chip concrete for spraying according to the present invention, the wood pieces are selected with a sieve so that their maximum dimensions are equal to or less than a predetermined dimension, and then the selected wood pieces are washed with water. Since the kneading is performed with cement and other necessary kneading materials, the pieces of wood are arranged at a maximum dimension or less, and if the maximum dimension is set appropriately, there is no possibility of being caught by clogging in the hose of a concrete sprayer.
[0046]
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a flowchart showing a manufacturing procedure of a method for manufacturing sprayed wood piece concrete according to a first embodiment.
FIG. 2 is a view showing a state where slope greening is performed using the method for producing sprayed wood chip concrete according to the first embodiment.

Claims (1)

A method for producing sprayed wood piece concrete in which a number of pieces of wood are cemented together with cement so that gaps are formed between the pieces of wood, wherein the pieces of wood are sieved so that their maximum dimensions are not more than a predetermined dimension. And then kneading the sorted wood pieces with water, cement or other required kneading materials.

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