JP6912796B2 - Spacer for spraying work - Google Patents

Description

The present invention relates to a spacer for spraying work used to keep the height of the wire mesh installed on the slope constant from the slope during the spraying work performed on the slope. More specifically, the present invention relates to a spacer for spraying work so that the height of the wire mesh installed on the slope from the slope is constant and the thickness (height) of the mortar layer sprayed by the operator is used as a guide.

Spraying work is one of the methods of covering slopes such as cliffs with mortar or concrete. For cliffs that have deteriorated due to weathering or erosion, it is necessary to carry out slope construction to stabilize the slope, but the effect of blocking the temperature change of the outside air and seepage water is very high and the workability is also excellent. Spraying work is often adopted. Since the geology of the cliff surface where the slope work is to be carried out is inhomogeneous and the progress of weathering is also inhomogeneous, it expands and contracts due to temperature changes, etc., depending on the thickness of the mortar layer and concrete layer to be sprayed after the spraying work. It becomes easy for cracks to occur.

For this reason, in the spraying work on the slope, wire meshing work should be used together on the slope for the purpose of dispersing cracks generated in the hardened cement such as mortar layer and concrete layer and preventing peeling from the slope. There are many. In the wire meshing work, it is desirable to install the wire mesh at a certain distance from the slope (specifically, the position of the wire mesh is half the height of the spray thickness), but the slope work should be done. Since the cliff surface to be carried out has irregularities and the like, the height is uneven (disjoint), and a mark or the like for securing the spraying height is required.

In Patent Document 1, for the purpose of maintaining the required distance between the wire mesh used for slope protection work and the ground, a flat plate having the required strength is formed into a triangular shape when viewed from the side surface to form a support. A spacer is disclosed in which a substantially square insertion notch formed larger than the width of the upper part is provided from the top of both slopes of the support to a required part of the lower part, and the notch is provided on the bottom surface. That is, after the wire mesh to be the reinforcing bar is temporarily installed on the construction slope, the spacer is temporarily installed between the wire mesh to be the reinforcing bar and the slope by passing the wire mesh through the insertion notches provided on both slopes of the triangular portion of the spacer. Is disclosed.

Japanese Unexamined Patent Publication No. 8-49358

Although the spacer according to Patent Document 1 (Patent Document 1: Name of the Invention) has a notch on the bottom surface, the ground contact area is still large, so that the cliff surface on which slope construction is performed is unstable due to unevenness of the surface shape or the like. Considering that it is a place, it can be said that the bottom surface, which has a large ground contact area, lacks stability during installation and work. Furthermore, since the flat plate with the required strength is formed in a triangular shape, the weight of each spacer becomes large, and the total weight of the number of spacers required for the installation work is very heavy, so that it is transported. It was not preferable because of the cost and labor.

An object of the present invention is to stably hold the wire mesh so that the height from the slope is constant even if the ground contact area is small, and to use a spacer for spraying work as a guide for the height of the mortar to be sprayed. Is to provide.

In order to solve the above problems, the invention described in claim 1 is installed on a wire mesh installed on a slope to adjust the height of the wire mesh from the slope to be constant, and also to use a mortar or the like. Spacers (spacers for spraying work) used as a guide for the height of the spray material , and when installed, two upper guides that are substantially parallel to the wire mesh and both ends of the upper guide. Four upper vertical portions extending downward from the upper vertical portion, four wire mesh mounting portions extending outward from the lower end of the upper vertical portion substantially parallel to the upper guide portion, and the wire mesh mounting portion. It is composed of four lower extension portions extending downward from the tip and two ground contact portions extending by connecting the tips of the lower extension portions so as to be in a twisted position with the upper reference portion. It is a feature. In the present specification, the "twisted position" refers to the positional relationship between two straight lines in a space in which the two straight lines are not parallel and do not intersect, that is, they are not in the same plane.

The invention described in claim 2 is characterized in that, in claim 1, it is a spacer for spraying work, which is formed by bending a single metal wire rod.

The invention according to claim 3 is, in claim 1 or 2, the lower extension portion is a spacer for spraying work having an angle of 20 ° to 40 ° with respect to the vertical axis toward the center. It is characterized by.

The spacer for spraying work according to claim 1 is a wire mesh stretched on a slope (specifically, the ground contact portion at the lower end is landed on the slope, and a part of the wire mesh is placed on the wire mesh mounting portion). It is a spacer to keep the height of the wire mesh from the slope constant and to use it as a guide for the height of the spray material such as mortar. When installed in wire mesh stretched on slopes, two upper guide portion in a positional relationship of the wire mesh and substantially parallel to, the four upper vertical portion extending downward from both ends of the upper guide portion, the upper vertical Four wire net mounting portions extending outward from the lower end of the portion substantially parallel to the upper guide portion , four lower extending portions extending downward from the tip of the wire net mounting portion, and a lower extending portion. It is composed of two ground contact portions that connect and extend the tips to each other so as to be in a twisted position with the upper reference portion.

The two upper guides, which are positioned approximately parallel to the wire mesh installed on the slope, are the heights of the mortar layer, etc. formed by the operator visually observing the upper guide during spraying work. Can be used as a guide for thickness). In normal spraying work, the height from the slope of the wire mesh is reduced to about half of the height from the slope (= thickness of the mortar layer, etc.) of the upper guide part, and the part above the wire mesh is used. It is desirable that the thickness of the part below the wire mesh is the same, but by designing the length of the four upper vertical parts as such, the height from the wire mesh surface to the top of the mortar layer ( Thickness) can be adjusted.

Since the wire mesh stretched on the slope can be placed on the wire mesh mounting part extending outward substantially parallel to the upper guide portion, the height of the wire mesh from the slope is maintained. Since the length of the lower extension portion, that is, the depth from the wire mesh surface to the slope can be freely designed, the thickness of the mortar layer from the wire mesh to the slope can be freely designed. Can be done.

Even if the grounding surface is inhomogeneous due to unevenness of the cliff surface (slope) due to the two grounding parts (small installation area) that are connected and extended so as to be in a twisted position with the upper guide part. By selecting a location with as few irregularities as possible and setting the ground contact portion with a small installation area on the slope, it is possible to stably support the spacer for spraying work.

The spacer for spraying work according to claim 2 is formed by bending a single metal wire rod, so that there is no problem in durability and the like, and a time-consuming process such as cutting and welding is included. Since the spacer for spraying work can be manufactured without any need, it is possible to reduce the processing cost and the like.

Since the lower extension portion of the spraying work spacer according to claim 3 has an angle of 20 ° to 40 ° with respect to the center, when the spraying work spacer is installed on the wire mesh in the slope reinforcement work. It is easy to pass through the gap of the wire mesh.

It is an overall front view of the spacer for spraying work which concerns on this Example. It is the whole bottom view of the spacer for spraying works. It is explanatory drawing which shows the installation state of the spacer for spraying work which concerns on this Example. It is the whole right side view of the spacer for spraying works.

<Structure of spacer for spraying work>
Hereinafter, an embodiment of the spraying work spacer 1 according to the present invention will be described in detail with reference to FIGS. 1 to 4. FIG. 1 is an overall front view of the spraying work spacer 1 according to the present embodiment.

In the spraying work spacer 1 according to the present embodiment, the ground contact portion 6 at the lowermost portion is landed on the slope, and a part of the wire mesh installed on the slope is brought into contact with the wire mesh mounting portion 4 ( By installing the wire mesh on the slope (so that the wire mesh mounting part 4 supports the wire mesh from below), the height of the wire mesh from the slope is kept constant and the operator sprays it. It is a spacer 1 for spraying work to use as a guide for the height of mortar or the like (thickness of the mortar layer). As can be seen from the fact that the position of the tip a and the position of the end b are marked on each of FIGS. 1 and 2, the spraying work spacer 1 according to the present embodiment is a single piece bent into a predetermined shape. It is composed of a rod-shaped material (metal material).

As described in FIG. 1, the spacer 1 for spraying work according to the present embodiment, which is composed of a single rod-shaped material (metal material) having a tip a and a terminal b, has a wire net installed on a slope. Two upper guide portions 2 that are substantially parallel to each other, four upper vertical portions 3 that are bent so as to extend downward from both ends of each of the upper guide portions 2, and the lower end of the upper vertical portion 3. Four wire mesh mounting portions 4 bent so as to extend outward substantially parallel to the upper guide portion 2, and a vertical axis (relative to the slope) from the tip of the wire mesh mounting portion 4 toward the center. ) And the three lower extension portions 5 bent so as to extend downward while having an angle of about 30 °, and the end b of one rod-shaped material are continuously connected and are closest to the end b. The lower extension portion 5'that is bent so as to extend substantially vertically downward from the wire net mounting portion 4 at the position, and the portion beyond each of the two lower extension portions 5 is abbreviated as the upper guide portion 2. While grounding the grounding portion 6 formed by bending so as to be in a twisted position and the rod-shaped material ahead of the lower extending portion 5'which is bent so as to extend substantially vertically downward, the grounding portion 6 is grounded on the slope. Bend toward the center, and then bend the rod-shaped member at the tip in the direction of twisting with the upper reference portion 2 so that it is finally entwined with the lower end of the lower extension portion 5 (1). It is composed of a ground contact portion 6'connected by entwining the tip a and the end b of the rod-shaped member of the book.

That is, since the spacer 1 for spraying work according to the present embodiment is formed by bending a single rod-shaped material having a tip a and a terminal b, the shape can be freely formed from the single rod-shaped material. For example, as shown in the circled portion indicated by the arrow in FIG. 1, the tip portion of the lower extension portion 5 which is the tip a (one end) of one rod-shaped material becomes a “dogleg” shape. In addition to being bent, the tip of the ground contact portion 6'which is the end b (the other end) of one rod-shaped material is folded back, and due to these shapes, the tip a and end b of one rod-shaped member are mutually It can be entwined.

As a single rod-shaped material bent into a predetermined shape, in this embodiment, PC steel wire (high-strength steel having a diameter of 8 mm or less), which is a tensioning material that gives tension to prestressed concrete (PC), is used. I'm using it. As the material and material constituting the spraying work spacer 1, various metal materials can be adopted in addition to the PC steel wire (high-strength steel having a diameter of 8 mm or less).

FIG. 2 is an overall bottom view of the spraying work spacer 1 according to the present embodiment. As shown by diagonal lines in FIG. 2 where the grounding point is in contact with the slope, the feature of the spraying work spacer 1 according to the present invention is as much as possible in view of the fact that the place (slope) to be installed has a large amount of unevenness. It can be mentioned that it has been devised so that it can be installed stably while reducing the contact area with respect to the slope.

That is, the grounding surface has two grounding portions 6 and 6', and since it is a rod-shaped material, the grounding area is small, and the metal material has a stress that does not exceed the elastic limit. If there is, since it is a material having elasticity, the ground contact portion 6 (6') can be installed so as to avoid the convex portion of the slope surface, for example, depending on the condition of the unevenness of the ground contact surface. The ground contact surface 6'that is continuously connected to the end b is first approximately 90 from the lower extension portion 5'that is bent so as to extend substantially vertically downward from the wire net mounting portion 4 toward the center portion. It is designed to touch the slope at an angle of ° (direction that is approximately parallel to the upper guide portion 2), and is extended from there to an angle of approximately 90 ° (at a twisted position with the upper guide portion 2). It is designed to be grounded in the direction of). That is, the ground contact portion 6'has an angle of 90 ° (the portion circled by the arrow) to further increase the stability at the time of installation.

<Installation status of spacers for spraying work>
FIG. 3 is a diagram showing an installed state of the spraying work spacer 1 according to the present embodiment. As described in FIG. 3, the spraying work spacer 1 according to the present embodiment is designed to have a size that can be just inserted into the grid of the wire mesh. When the spraying work spacer 1 according to this embodiment is installed on the slope, first, from the bottom, the ground contact portions 6, 6'on the slope, and then the vertical axis and the angle of 20 ° to 40 ° toward the center. In this embodiment, the lower extending portion 5 and the wire mesh mounting portion 4 are arranged in this order, and the wire mesh mounting portion 4 is installed on the slope at a position below the wire mesh. By inserting the spacer 1 for spraying work according to the above, it is installed on the slope. At this time, the wire mesh installed on the slope is installed so as to be lifted from the lower side to the upper side in the wire mesh mounting portion 4. At the same time, due to the reaction, a force that presses from the wire mesh installed on the slope from the upper side to the lower side acts, so that the spacer 1 for spraying work according to this embodiment can be stably installed on the slope. ..

<Effect of spacer for spraying work>
FIG. 4 is an overall right side view of the spraying work spacer 1 according to the present embodiment. The height of the spraying work spacer 1 (indicated as "A" in FIG. 4) (height from the slope of the upper guide portion 2) according to this embodiment is the mortar when the operator performs the spraying work. It is designed to be the thickness of the entire layer. That is, the two upper guide portions 2 which are substantially parallel to the wire mesh installed on the slope are the heights of the mortar layer and the like to be sprayed by the operator by visually observing the upper guide portion 2 during the spraying work. Can be used as a guide.

The spacer 1 for spraying work according to this embodiment is capable of mounting the wire mesh on the wire mesh mounting portion 4, and has the lengths of the four upper vertical portions 3 (“B” in FIG. 4). The height from the wire mesh surface installed on the slope can be designed by adjusting the display). That is, the thickness of the mortar layer above the wire mesh can be designed by adjusting the length of the upper vertical portion 3. Further, the depth from the wire mesh surface installed on the slope can be designed by adjusting the vector length (indicated as "C" in FIG. 4) in the vertical direction of the lower extension portions 5, 5'. can. That is, the thickness of the mortar layer below the wire mesh can be designed by adjusting the vector length (indicated as "C" in FIG. 4) in the vertical direction of the lower extension portions 5, 5'.

Installing a wire mesh on a slope In wire meshing work, it is recommended to install the wire mesh at a certain distance from the slope (specifically, the position of the wire mesh is half the height of the spray thickness). Since it is desirable, the lengths of the four upper vertical portions 3 (indicated as "B" in FIG. 4) and the vertical vector lengths of the lower extension portions 5, 5'(in FIG. 4). If the lengths (indicated as "C") are the same, the effects of dispersing cracks generated in the hardened cement such as mortar layer and concrete layer by installing wire mesh and preventing peeling from the slope can be maximized. Therefore it is desirable.

Since the spacer 1 for spraying work according to this embodiment is made of a single rod-shaped material bent into a predetermined shape, the installation portions 6 and 6'that are in contact with the slope are not surfaces. It is designed to be grounded with a wire with a small area. That is, even if the slope condition is unstable due to the unevenness of the cliff surface due to the two ground contact portions 6 and 6'that are connected and extended so as to be in a twisted position with the upper guide portion 2. By selecting a location that is as stable as possible with a smaller installation area, the spacer 1 for spraying work can be stably supported.

Further, on the ground contact surface 6', first, an angle of approximately 90 ° from the lower extending portion 5', which is bent so as to extend substantially vertically downward from the wire net mounting portion 4, toward the central portion (upper guideline). It is designed to touch the slope on the slope in a direction that is substantially parallel to the portion 2 (see FIG. 2), and is extended from there to an angle of approximately 90 ° (a twisted position with the upper reference portion 2). It is designed to touch the ground in the direction (direction) (see FIG. 2), and the portion having an angle of 90 ° (the portion circled by the arrow in FIG. 2) further increases the stability at the time of installation.

Since the spacer 1 for spraying work according to this embodiment is configured by bending a single metal wire rod, it can be manufactured without the trouble of welding and the like, so that the processing cost and the like can be reduced. Can be planned. Since the lower extension portion 5 of the spraying work spacer 1 has an angle of 20 ° to 40 ° with respect to the center toward the center, the wire mesh is installed when the spraying work spacer 1 is installed on the wire mesh in the slope reinforcement work. It is easy to pass between the squares.

<Example of changing spacers for spraying work>
The spacer for spraying work according to the present invention is not limited to any of the above-described embodiments, and includes a configuration of an upper guide portion, an upper vertical portion, a wire mesh mounting portion, a lower extension portion, a grounding portion, and the like. It can be appropriately changed as necessary without departing from the spirit of the present invention. For example, the spacer for spraying work according to the present invention may have a function of displaying a mark so that the uppermost part of the mortar layer can be visually recognized when performing the spraying work, and a function of supporting the wire mesh installed on the slope from below. Just do it. Therefore, it is not necessary that one rod-shaped member is bent, and it may be composed of a member obtained by bending two or more rod-shaped materials and connecting them. The material may be made of resin other than the metal material.

Since the spacer for spraying work according to the present invention exerts an excellent effect as described above, the spraying work which serves as a guideline for the thickness of the mortar during the spraying work while reinforcing the mortar layer in the spraying work in the slope work. It can be suitably used as a spacer for work.

1 ・ ・ Spacer for spraying work 2 ・ ・ Upper guide part 3 ・ ・ Upper vertical part 4 ・ ・ Wire mesh mounting part 5,5'・ ・ Lower extension part 6,6' ・ ・ Grounding part a ・ ・ Tip b ・ ・Termination

Claims (3)

It is a spacer that adjusts the height of the wire mesh from the slope to be constant by installing it on the wire mesh installed on the slope, and also serves as a guide for the height of the spray material such as mortar.
When installed, the two upper guide parts that are in a positional relationship approximately parallel to the wire mesh,
Four upper vertical portions extending downward from both ends of the upper guide portion, and
Four wire mesh mounting portions extending outward from the lower end of the upper vertical portion substantially parallel to the upper guide portion,
Four lower extension portions extending downward from the tip of the wire mesh mounting portion, and
A spacer for spraying work, which comprises two ground contact portions that connect and extend the tips of the lower extension portions so as to be in a twisted position with the upper reference portion. The spacer for spraying work according to claim 1, wherein the spacer is formed by bending a single metal wire rod. The spacer for spraying work according to claim 1 or 2, wherein the lower extending portion has an angle of 20 ° to 40 ° with respect to the vertical axis with respect to the center.

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