JPH0312816Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to an earth retaining support used for retaining earth on the side wall of a trench or the like.

(Prior art and its problems) Conventionally, for example, when burying a sewer pipe, etc., a trench with a considerable depth is dug, and a worker enters the trench to carry out the plumbing work. Because there is a risk that the side wall of the hole may collapse, earth retention measures will be taken for this side wall.

In this earth retaining measure, as shown in FIGS. 3 and 4, flat earth retaining sheet piles 51 having an appropriate area are erected in rows along the side wall surface of the groove M. A long rib 52 such as a square lumber is installed horizontally in the upper part of the wall, and a strut 53 is hung in a direction perpendicular to the rib 52, and the strut 52 is connected to the groove. The earth retaining sheet pile 51 was pressed in the direction of the wall surface of the groove M, and the earth retaining sheet pile 51 came into contact with the side wall, and the earth retaining of the side wall of the slot M was performed.

Such earth retaining sheet piles 51, uprights 52, struts 53, etc. are currently cut into appropriate lengths at the construction site and used for earth retaining purposes, but in order to carry out cutting work at the site. , earth retention work takes a long time,
Moreover, the pressing support force against the slot M could not be said to be very promising.

(Means for Solving the Problems) The present invention was devised in view of the above-mentioned conventional problems, and can be used as a simple substitute for the conventional ribs or struts when retaining earth in trenches, etc. The purpose of the present invention is to provide a support for earth retention that has an earth retention structure and exhibits an earth retention effect when used.
Its gist is that it is composed of a cylindrical outer cylinder and a cylindrical inner cylinder that has the same cross-sectional shape as the outer cylinder and is loosely inserted into the outer cylinder. At least one side has a plurality of perfect circular holes drilled at equal intervals in the longitudinal direction, and at least one of the upper surface and the lower surface of the inner nuclear cylinder has oblong holes arranged at equal intervals. A plurality of holes are formed in the longitudinal direction aligned with the perfect circular hole, and a difference in pitch is provided between the holes and the nuclear oblong hole.

(Function) The earth retaining support of the present invention, which is used for retaining earth in trenches, etc., and serves as a substitute for conventional struts or ribs, etc., is arranged at equal intervals along the longitudinal direction of either the upper surface or the lower surface, or both sides. An outer cylinder with a circular hole bored in the outer cylinder, and an outer cylinder that is inserted into the outer cylinder in a folded manner and arranged at a pitch different from that of the circular hole at a position aligned with the circular hole of the outer cylinder. Since it is composed of an inner cylinder with oblong holes drilled at intervals, when the inner cylinder is slid inside the outer cylinder, the elongated holes of the inner cylinder are located at appropriate positions relative to the perfect circular holes of the outer cylinder. The two holes are partially aligned, and the difference in pitch between the oblong hole and the perfect circular hole creates a gap where both holes are aligned. By driving a pin into this gap from above, the gap between both holes is expanded, and the tip of the outer cylinder and the tip of the inner cylinder move outward, so the tip of the outer cylinder and the tip of the inner cylinder are moved outward. If the earth retaining sheet piles are brought into contact with the earth retaining sheet piles, a pressing force is generated to press the earth retaining sheet piles outward, and the earth retaining support of the present invention can be easily and firmly supported between the earth retaining sheet piles. Moreover, by driving one pin into the gap, a gap is formed between both holes at another location, so by driving more pins into this gap, the outward pressing force can be gradually increased. I can go.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a perspective view of the present earth retaining support, and in the figure, the earth retaining support 1 includes an outer cylinder 2 having a cylindrical shape with a rectangular cross section and made of a material such as iron or aluminum;
It is composed of the outer cylinder 2 and an inner cylinder 3 formed into a cylindrical shape having a similar rectangular cross section and a slightly smaller diameter than the outer cylinder 2. It has a structure that allows it to fit.

In the upper surface 2a and lower surface 2b of this outer cylinder 2, perfect circular holes 4 are formed at equal intervals along the longitudinal center portion thereof.
A suitable number of holes have been drilled.

On the other hand, in the upper surface 3a and lower surface 3b of the inner cylinder 3, a suitable number of oblong holes 5 are bored at equal intervals along the longitudinal center thereof.

Note that there is a pitch difference between the perfect circular hole 4 drilled in the outer cylinder 2 and the oblong hole 5 bored in the inner cylinder 3. For example, in this example, the perfect circular hole 4 has a pitch of 9/10 at a certain distance. The oblong holes 5 in the inner cylinder 3 are bored at a pitch of 10/10 at the same distance. Also, the diameter of the oblong hole 5 in the longitudinal direction is 2 compared to the hole diameter of the perfect circular hole 4.
It is set to double the length. That is, if the diameter of the circular hole 4 is Y, the diameter of the oblong hole 5 is X, and X=
It has become a 2Y relationship.

When the outer end edges 2c and 3c of the outer cylinder 2 and inner cylinder 3 configured in this way are installed horizontally on the retaining sheet pile 51 erected on the side wall of the slot M, they form a perfect circle as shown in FIG. Due to the difference in pitch between the hole 4 and the oblong hole 5, a gap S is formed at an appropriate location between the two holes. By driving the pin 6 into the appropriate gap S with a hammer or the like from above, the pin 6 is fitted into the gap S, and the outer edge 2c of the outer cylinder 2 and the outer edge 3c of the inner cylinder 3 are slightly Moving. This movement causes each outer edge 2c and 3
c presses the earth retaining sheet piles 51 that come into contact with the earth retaining sheet piles 51, and the earth retaining support 1 is placed firmly horizontally between the earth retaining sheet piles 51.

The pin 6 is fitted into the gap S and the outer edge 2 of the outer cylinder 2
By slightly moving the outer edge 3c of the inner cylinder 3, another small gap S is created between the circular hole 4 and the oblong hole 5.
However, by driving another pin 6 into this narrow gap S, both outer edges 2c and 3 are further removed.
c can be expanded and moved outward, and the retaining sheet pile 51 can be pressed more firmly.

In this way, by using the two pins 6 and driving the pins 6 alternately into the narrow gaps S that are successively generated, both outer edges 2c and 3c are gradually expanded and moved outward, and the retaining sheet piles 51 The present earth retaining support 1 can be firmly supported horizontally between the two, and the earth retaining effect can be perfected.

In addition, the outer end edge 2c of the outer cylinder 2 and the outer end edge 3 of the inner cylinder 3
c may be provided with an outwardly protruding flange portion to increase the contact area.

In this way, the earth retaining support 1 of this example has a simple structure consisting of the outer cylinder 2 and the inner cylinder 3, so it can be manufactured extremely easily and at low cost. By sliding the inner cylinder 3, the length can be adjusted according to the width of the slot M in which it is installed horizontally.Moreover, it is firmly tightened by driving the pin 6, and a pressing force is applied between the retaining sheet piles 51. It can be raised and installed horizontally.

In this example, the outer tube 2 and the inner tube 3 are illustrated as having a rectangular cross-section, but the cross-sectional shape is not particularly limited, and may be circular or polygonal. Furthermore, the lengths of the outer tube 2 and the inner tube 3 are not particularly limited. Furthermore, the pitch interval and hole diameter of the circular hole 4 and the oblong hole 5 are not limited. For example, the diameter of the circular hole 4 is 10 mm, and the pitch interval is 30 mm.
mm, the diameter of the oblong hole 5 may be 20 mm, and the pitch interval may be 25 mm.

(Effects of the invention) The earth retaining support of the invention is composed of a cylindrical outer cylinder and a cylindrical inner cylinder that has the same cross-sectional shape as the outer cylinder and is loosely inserted into the outer cylinder. , a plurality of perfectly circular holes are formed at equal intervals in the longitudinal direction of at least one of the upper surface and the lower surface of the outer cylinder, and an elliptical hole is formed in at least one of the upper surface and the lower surface of the inner cylinder. A plurality of oblong holes having the shape of the shape are drilled at equal intervals in the longitudinal direction aligned with the perfect circular hole, and a pitch difference is provided between the boring intervals between the perfect circular holes and the oblong holes. By expanding and contracting the inner cylinder to an appropriate length with respect to the outer cylinder, it can be adapted to any slot, and by driving a pin into the matching gap between the perfect circular hole and the oblong hole, it can be pushed outward. It can generate pressure and exert its effect as an earth retaining support. Moreover, it has a simple structure and can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of an earth retaining support showing an embodiment of the present invention, and Fig. 2 is a plane showing the alignment state of the perfect circular hole and the oblong hole drilled in the earth retaining support shown in Fig. 1. Figures 3 and 4 show the conventional earth retaining condition,
FIG. 3 is a plan view showing the earth retaining state, and FIG. 4 is a front sectional view of FIG. 3. M... Groove, 51... Earth retaining sheet pile, 1... Earth retaining support, 2... Outer cylinder, 3... Inner cylinder, 4... Perfect circular hole,
5...Oval hole, 6...Pin, S...Gap.

Claims (1)

[Scope of utility model registration request] It is composed of a cylindrical outer cylinder and a cylindrical inner cylinder that has the same cross-sectional shape as the outer cylinder and is loosely inserted into the outer cylinder, and at least one of the upper surface and the lower surface of the outer cylinder has a A plurality of perfect circular holes are bored at equal intervals in the longitudinal direction of the inner cylinder, and oval holes are formed at equal intervals on at least one of the upper surface and the lower surface of the inner cylinder. 1. A retaining support device, characterized in that a plurality of holes are drilled in the longitudinal direction aligned with the hole, and a pitch difference is provided between the holes and the oblong holes.