JPH0310196Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention relates to earth retaining supports, and more specifically, for example, supports that are installed horizontally on opposite side walls of excavated trenches in which sewer pipes and telephone lines are buried. This invention relates to an improvement in an earth retaining support that is installed between a pair of raised walls to maintain the distance between both side walls and to prevent earth and sand from collapsing.

[Conventional technology]

Generally, this type of retaining support has a base end portion of a cylinder a, and a piston rod b that is telescopically engaged with the cylinder a, as shown in Fig. 6.
Pressing plates c, d are attached to the proximal ends of the excavated groove e, and these pressing plates c, d are attached to the opposing side walls f,
side walls f, g of the excavated groove e
It is used to prevent landslides from collapsing. In this case, the conventional earth retaining support expands and contracts as pressure fluid enters and exits the cylinder a, and when removed, a portion of the fluid in the cylinder a is extracted and the support is contracted before being removed.

[Problem to be solved by the invention] However, since earth pressure is constantly applied to both ends of the earth retaining support, when removing the earth retaining support from the excavated trench e, it is necessary to remove an appropriate amount of pressure fluid from the cylinder a. Also, if the inclination of the sheet pile h due to the horizontal return of the earth pressure on the side walls f and g is greater than the amount of contraction of the earth retaining support, then the earth retaining support is suspended horizontally on both sheet piles h and h, respectively. There were problems in that it was difficult to remove the earth retaining support because it got caught in between or because the gap was too small. As a means to solve this problem, it is possible to interpose a contraction spring between the cylinder a and the piston rod b and use the repulsive force of this spring during contraction to accelerate the contraction speed of the support. Since the length of use is not constant, simply using a contraction spring will cause the support to contract unnecessarily, which may cause the support to fall off.The amount of contraction will vary depending on the support length, so it may be difficult to remove. There are also other problems, such as reattachment being troublesome.

[Means for solving problems]

This idea was created in view of the above circumstances, and in order to solve the above technical problem, the pressure plate is tilted by the repulsive force of the spring when the pressure fluid is removed during installation and removal, making installation and removal easy. The purpose of the present invention is to provide a support for retaining earth, which is characterized by being able to be used in a variety of ways.

That is, in this invention, the proximal end of the cylinder,
By locking and abutting the pressing plates attached to the base ends of the piston rods that are extendably and contractably engaged with the cylinder to the double-sided braces installed horizontally on the opposing side walls of the excavation groove. In the earth retaining support for preventing the collapse of earth and sand on the side wall of the excavated trench, the pressing plate is attached to the base end of the cylinder and the base end of the piston rod, each having a pivot at a position eccentric to the center of these axes. is swingably mounted, and a spring is compressed between the base end of the cylinder on the opposite side of the pivot with respect to the axis center and the pressing plate, and between the base end of the piston rod and the pressing plate. It is intended to provide support for retaining earth.

In this invention, the springs compressed between the base end of the cylinder and the pressing plate and between the base end of the piston rod and the pressing plate may be made of any spring material, but are preferably made of compression coil springs. It is good to do. Further, the springs installed between the base end of the cylinder and the pressing plate and between the base end of the piston rod and the pressing plate may be installed at any desired position, but at least one of the springs may be installed above the axis center. Once positioned, the upper end of the press plate will be inclined outward during attachment and detachment, making attachment and detachment operations easier.

[Effect]

The above technical means works as follows.

When installing or removing the earth retaining support with the pressurized fluid in the cylinder discharged, the distance between the two pressing plates decreases, and each pressing plate tilts around the support shaft due to the repulsive force of the spring. Therefore, the retaining support can be easily installed and removed, and can also be reinstalled easily.

〔Example〕

Examples of this invention will be described below based on the drawings.

Figure 1 is a vertical sectional view showing the first embodiment of the earth retaining support of this invention, and Figures 2 and 3 are a plan view and a side view of Figure 1, respectively. The cylinder 10 and the piston rod 12 are telescopically and slidably engaged with each other, and the base end of the cylinder 10 and the piston rod 1 are
A pair of press plates 1 each attached to the proximal end of 2.
4 and 16 constitute the main part. In this case, the piston rod 12 is formed into a tubular shape, and the piston 1 is attached to the tip.
3 is slidably fitted into the inner circumferential surface of the cylinder 10, and a head 18 is fixed to the base end. In this case, one end of an outer pipe 20 is fixed to the head 18 and is disposed coaxially with the piston rod 12 so as to surround the piston rod 12. On the other hand, the cylinder 10 has a head 17 fixedly installed at its base end, and a dust bushing at its distal end that slides against the outer circumferential surface of the piston rod 12 and the inner circumferential surface of the outer pipe 20 to remove dirt and the like adhering to these surfaces. 22 is fixedly installed.

Each of the heads 17 and 18 has a pivot 24.
The press plates 14 and 16 are mounted so as to be able to swing in the vertical direction. In this case, the head 17 fixedly attached to the base end of the cylinder 10 is rotated with respect to the axial center of the cylinder 10 and the piston rod 12. A pressing plate 14 is swingably mounted with a pivot shaft 24 located at a lower eccentric position so that its upper end can be tilted outward, and is also fixedly attached to the base end of the piston rod 12. The head 18 is swingably mounted with a pivot 24 located at an upper eccentric position with respect to the axes of the cylinder 10 and the piston rod 12 so that the press plate 16 can tilt outward at its lower end. In this case, the pressing plates 14 and 16 have a plate-shaped base 15a and a pair of projecting parts 1 that protrude inward from the base 15a.
5b, 15c, both projecting parts 15b,
The heads 17 and 18 disposed between the two heads 15c are swingably mounted by a pivot 24 passing through the projecting portions 15b and 15c and the heads 17 and 18. Between the head 17 and the press plate 14 at the proximal end of the cylinder 10 on the opposite side to the pivot 24 with respect to the axial centers of the heads 17, 18 and the press plates 14, 16 configured in this way, and at the proximal end of the piston rod 12. A spring 30 is provided between the head 18 and the pressing plate 16, respectively, to constantly press the pressing plates 14, 16 outward. In this case, a compression coil spring is used as the spring 30, and both ends thereof are connected to the heads 17, 18 and the pressing plates 14, 1.
It is engaged with a protrusion etc. protruding from 6 to prevent it from falling off. Incidentally, one or more compression coil springs 30 are used in parallel between the heads 17, 18 at both left and right ends and the pressing plates 14, 16, respectively. Note that the spring 30 may also be a leaf spring, an air spring, or the like.

Further, on the outside of the upper portions of the pressing plates 14 and 16, there is an angle member 46 that is engaged with the upper surface of a raised upright 44 horizontally installed between sheet piles 42 disposed on the side walls 41 and 41 of the excavated trench 40, which will be described later. Bolt 34 and nut 36
It is fixedly installed by. In addition, the pressure plate 1
A U-shaped handle 26, which is used when removing the earth retaining support, is swingably attached to the upper inner side of 4 and 16. Further, a coupler 28 having a check valve used for supplying and withdrawing pressure fluid into the cylinder 10 is connected to the head 17 fixedly installed at the base end of the cylinder 10, and is connected to the head 17, which is connected to the head 17 and has a check valve for supplying and withdrawing pressure fluid into the cylinder 10. In this case, a high-pressure hose 29 connected to a pump (not shown) is connected to the coupler 8 and the pump is driven to supply pressure fluid into the cylinder 10 and connect the cylinder 10 and the piston rod 12. are relatively elongated, and the distance between both side walls 41, 41 of the excavated trench 40 is maintained.

In the above embodiment, the head 17, which is fixed to the base end of the cylinder 10, and the press plate 14 are attached to each other by means of a pivot 24 located at an eccentric position below with respect to the shaft center. Although the case has been described in which the fixedly installed head 18 and the press plate 16 are attached by the pivot shaft 24 located at an upper eccentric position with respect to the shaft center, as shown in FIG. When the pivot shafts 24 are both positioned at downwardly eccentric positions with respect to the shaft center and the pressurized fluid in the cylinder 10 is not supplied, the pressing plates 14 and 16 are moved by the repulsive force of the spring 30.
If the upper portions of the earth retaining supports are formed so as to be inclined outward, the retaining supports can be attached and detached more easily.

In addition, as shown in FIG. 3, the pressing plates 14 and 16 have elongated holes 32 extending in the vertical direction, and are screwed to bolts 34 passing through the elongated holes 32. The angle member 46 can be adjusted up and down by the nut 36.
It is installed on 6. In this case, the long hole 32
has enlarged portions 32a at both ends and the center in the vertical direction, and the bolt 34 has a large-diameter threaded portion and a small-diameter threaded portion that fit into the enlarged portions 32a, and the small-diameter threaded portion is inserted into the elongated hole 32. It is movable between both ends in the vertical direction. Then, the vertical position of the angle member 46 is adjusted by fitting the large diameter threaded part of the bolt 34 into the enlarged part 32a of the elongated hole 32 and then screwing the nut 36 to the small diameter threaded part of the bolt 34. Ru. At this time, the hexagonal head of the bolt 34 comes into contact with the overhanging parts 15b and 15c, so rotation is inhibited and loosening is prevented.

In order to use the earth retaining support of this invention constructed as described above, as shown in FIG. After disposing the earth retaining support of this invention between the risers 44 and connecting the high pressure hose 29 to the pump (not shown) to the coupler 28, when the pump is driven, the cylinder 10
Since pressure fluid is supplied inside, the cylinder 10 and the piston rod 12 expand relatively, and both the pressing plates 14 and 16 lock and abut on the raised ribs 44, and the interval between the raised ribs 44 is reduced. While being held, both side walls 4
1. Collapse of earth and sand is prevented. Therefore, piping work can be performed safely. In addition, when removing the earth retaining support, after removing the high pressure hose 29 from the coupler 28, by pressing a work rod (not shown) against the check valve of the coupler 28, an appropriate amount of fluid in the cylinder 10 can be removed from the coupler 28. The cylinder 10 and piston rod 12 are discharged to the outside.
is compressed to an appropriate length, and the compression coil spring 3
The pressing plates 14 and 16 are tilted due to the repulsive force of 0,
At least a gap l is formed between the pressing plates 14, 16 and the belly riser 44. In this state, the earth and sand return and the sheet pile 42 inclines inward to the groove, but the retaining support can be removed by lifting the handle 26 with a work stick or the like, and can be easily reattached.

[Effect of idea]

As explained above, according to the earth retaining support of this invention, the pressing plates are pivoted at the base end of the cylinder and the base end of the piston rod with pivots located eccentrically with respect to the centers of these axes. The springs are compressed between the base end of the cylinder on the opposite side of the pivot with respect to the center of the shaft and the press plate, and between the base end of the piston rod and the press plate, so that the following You can get an effect like this.

1. When the fluid pressure in the cylinder decreases, the cylinder and piston rod contract, and the pressure plate tilts due to the repulsive force of the spring, so the retaining support can be easily removed and can be removed with the minimum amount of contraction. This makes reinstallation easy.

2. Because the spring can be made relatively small, the expansion and contraction occurs due to the amount of contraction of the earth retaining support and the slight repulsive force of the spring, and there is no risk of the earth retaining support falling off inadvertently, allowing for smooth reinstallation. be able to.

3. Since the spring can be incorporated regardless of the cylinder or piston rod, assembly is easy and can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the first embodiment of the earth retaining support of this invention, Figs. 2 and 3 are a plan view and a side view of Fig. 1, respectively, and Fig. 4 is a second embodiment of the earth retaining support of this invention. FIG. 5 is a longitudinal sectional view showing the embodiment, FIG. 5 is a sectional view showing the removed state of the earth retaining support of this invention, and FIG. 6 is a sectional view showing the conventional earth retaining support in use. Explanation of symbols: 10...Cylinder, 12...Piston rod, 14, 16...Press plate, 17, 18...
...Head, 24...Pivot, 30...Compression coil spring.

Claims (1)

[Claims for Utility Model Registration] (1) A pressing plate attached to the base end of the cylinder and the base end of the piston rod that is extendably engaged with the cylinder is attached to the opposing side wall of the excavation groove. In an earth retaining support that prevents the collapse of earth and sand on the side wall of the excavation trench by being locked to horizontally installed double-side uprights, these shafts are attached to the base end of the cylinder and the base end of the piston rod. Each of the pressing plates is swingably mounted with a pivot at a portion eccentric to the center, and a portion between the base end of the cylinder and the pressing plate on the opposite side of the pivot with respect to the center of the axis, and the base of the piston rod. A retaining support consisting of a spring compressed between the end and the pressing plate. (2) The earth retaining support according to claim 1, wherein the springs compressed between the base end of the cylinder and the pressing plate and between the base end of the piston rod and the pressing plate are compression coil springs. (3) Utility model registration claim 1, in which at least one of the springs compressed between the base end of the cylinder and the pressing plate and the base end of the piston rod and the pressing plate is located above the axis center. Earth retaining support as described in paragraph or paragraph 2.