JPS603143Y2 - Simple earth retaining cutting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting device that can be installed and removed from the ground and is used for retaining earth for small-scale trench excavation.

Conventionally, the most commonly used method for retaining earth in small-scale trench excavations is to cut wood into lengths that correspond to the width of the excavation and hammer them between the timber in the excavation trench or earth retaining boards such as simple steel sheet piles. However, such a method has poor workability such as dimension adjustment, and is also low in reliability in terms of safety.

In addition, steel pipe supports have recently been used instead of wood, but these have the disadvantages that the expansion and contraction work must be carried out inside an excavated trench, which is highly dangerous and requires time to install.

The purpose of the present invention is to overcome these conventional drawbacks, and to provide a cutting and tensioning device that is small, lightweight, and can be installed from the ground with a single touch.

The structure of the present invention, which is distantly related to such an object, includes a main shaft in which fitting teeth are carved on both sides in the longitudinal direction and is rotatable around a central axis in the longitudinal direction, and a main shaft that is loosely fitted on this main shaft and has fitting teeth on both sides in the longitudinal direction. a fitting plate that can be fixed by meshing with each other; a pair of first arms that are pivotally attached to a spindle support plate provided at the tip of the spindle; a pair of second arms attached to each other to form a diamond-shaped link; and a cutting plate fixing plate rotatably pivoted to a pivot joint between the first arm and the second arm to press down on the excavation groove wall. do.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

The device of the present invention is shown in Fig. 1a and Fig. 1 showing details of each part thereof.
As shown in Figures b-f, the main shaft 1 has fitting teeth 1a carved on both sides near the center, as shown in Figure 1e.

Further, as shown in FIG. 1f, a pin 1b is implanted at the tip of the main shaft 1, and this pin 1b is loosely fitted into the main shaft support plate 2, and a nut is provided at the lower end.
It is mounted so that it can rotate around its longitudinal central axis.

Further, a fitting plate 3 is loosely fitted at a position corresponding to the fitting tooth 1a of the main shaft 1, and fitting teeth that can mesh with the fitting tooth 1a are carved on the fitting plate 3, Main shaft 1
By rotating the mating plate 3 by 90 degrees, the mating plate 3 is aligned with the mating tooth 1a of the main shaft 1.
It can be engaged and released.

A pair of first arms 4 are rotatably attached to the main shaft support plate 2, as shown in FIG. A second arm 5 is rotatably connected, and the first arm 4 and second arm 5 are rotatably connected to form a rhombic link, as shown in FIG. 1d. .

As shown in FIG.
is rotatably pivoted to press and support the retaining plate inserted into the excavation groove.

Further, a press-down plate 7 is fixed to the fitting plate 3, and is pressed down with a foot or the like in order to project the cutting and fixing plate 6.

Furthermore, a handle 8 is attached to the upper end of the main shaft 1, making it easy to install and remove the device of the present invention from an excavated trench.

Earth retention work using the device of the present invention constructed as described above is carried out as follows.

As shown in FIG. 2, in advance, a locking member 11 with a cross-sectional shape corresponding to the shape of the cut-off fixing plate 6 is attached to the retaining plate 10 inserted into the excavated groove 9 so that the cut-off fixing plate 6 can be locked. (In the illustrated example, the cutting and tensioning fixing plate 6 is hexagonal, so the shape is made to correspond to this and form a part of the hexagon.)

After that, the main shaft 1 is rotated 90 degrees in the direction A in the figure so that the fitting plate 3 becomes free, and the push-down plate 7 is rotated in the figure so that the cutting plate 6 can be locked to the locking member 11. Push down towards the mouth.

Then, the sillage fixing plate 6 is locked to the locking member 11, and the sillage fixing plate 6 is further extended so that the earth retaining plate 10 is attached to the excavated groove 9.
When the main shaft 1 is completely in close contact with the wall surface, the main shaft 1 is rotated 90 degrees, and the fitting teeth 1a and the fitting plate 3 are engaged and fixed, thereby completing the earth retaining.

When the device of the present invention is removed from the excavation groove 9 because the earth retaining is no longer necessary, the main shaft 1 is rotated 90 degrees to release the engagement between the fitting teeth 1a and the fitting plate 3, and the handle 8 can be easily removed. It can be pulled out.

As described above in detail along with the embodiments, according to the device of the present invention, all steps of earth retaining work can be carried out from the ground in a short time, thereby improving work efficiency and safety.

Furthermore, the device of the present invention is lightweight, easy to handle, and has excellent versatility.

[Brief explanation of drawings]

Figure 1 a% f and Figure 2 show the simple slitting device for earth retaining of the present invention, Figure 1 a is the overall front view, the same is a detailed view of the fitting plate part, and c and d are the sillage fixing device. FIG. 2 is a detailed view of the plate portion, e is a detailed view of the fitting teeth, f is a detailed view of the spindle support plate portion, and FIG. In the drawings, 1 is the main shaft, 1a is the fitting tooth, 1b is the pin, 2 is the main shaft support plate, 3 is the fitting plate, 4 is the first arm, 5 is the second arm, 6 is the cutting plate, and 7 is the pusher. 8 is a handle, 9 is an excavation groove, 10 is a retaining plate, and 11 is a locking member.

Claims (1)

[Scope of utility model registration request] a main shaft having fitting teeth engraved on both sides in the longitudinal direction and rotatable around a central axis in the longitudinal direction; a fitting plate that is loosely fitted onto the main shaft and can be fixed by meshing with the fitting teeth; A pair of first arms pivotally attached to a spindle support plate provided at the tip of the spindle, and a pair of second arms pivoted to the fitting plate and pivoted to the first arm to form a rhombic link. and a sillage fixing plate rotatably connected to the pivot portion of the first arm and the second arm to press down the excavation trench wall.