JPS5847096Y2 - Earth retention shoring device for excavated trenches - Google Patents

Description

[Detailed description of the invention] The present invention relates to an earth retention shoring device for excavation trenches, particularly for excavation trenches suitable for facilitating the removal of panels inserted between adjacent guide rails on each side of the excavation trench. Regarding earth retention shoring devices.

Conventionally, guide rails are erected at required intervals along both sides of an excavation trench to settle as soil is removed for trench excavation, and panels are inserted between adjacent guide rails on each side of the excavation trench. , three guide rollers provided in the vertical direction on both sides of the panel and rolling in the lip grooves of the guide rails as the panel moves up and down, and spindles connecting the guide rails facing each other in the groove width direction. An earth retention shoring device for an excavated trench is generally known.

Unlike construction methods in which retaining walls are constructed by driving sheet piles, this type of support device does not produce severe vibrations or noise, and can shorten the construction period, making it suitable for trench excavation in urban areas.

In this support device, as shown in FIG. 1, what constitutes the retaining wall surface is a panel, and this panel 4 is connected to guide rails (not shown) by three guide rollers 6 provided in the vertical direction on both sides of the panel. It is supported so that it can move up and down.

Then, as shown by arrow F, the panel 4 is subjected to earth pressure that gradually increases toward the lower end.

For this reason, the panel 4 is deflected toward the inner side of the groove, and this deflection is maximum at the center in the vertical direction, so that the load is concentrated on the guide roller 6 at the center in the vertical direction.

Tonosho increases as time passes after the panel 4 is erected, so it requires a great deal of force to pull out the panel 4, and
There is a risk of damaging the guide roller 6 in the center.

Furthermore, if the panel 4 itself is forcibly restrained from deflecting at the center, the load will be concentrated at the center, resulting in a shortened lifespan.

The present invention was devised to solve these conventional problems, and its purpose is to provide an earth retaining support for excavation trenches that can equalize the load applied to the force-dry rollers and facilitate panel pulling out work. We are in the process of providing equipment.

The present invention focused on the fact that the conventional difficulty was that three guide rollers were installed vertically in a straight line. The guide rollers are biased toward the outside to equalize the load applied to each guide roller.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes guide rails, and these guide rails 1 are arranged in large numbers in the longitudinal direction at required intervals along the longitudinal direction of the excavated groove A at opposing positions on both sides of the excavated groove A, as shown in FIG. , so that it gradually settles as the excavation progresses.

As shown in FIG. 3, the guide rail 1 is made up of lip channel steel 2.2 that opens back to back in the longitudinal direction of the excavation groove A, and lip channel steel 3 that opens toward the inside of the excavation groove A. As shown in FIG. 2, a large number of holes 3a are vertically bored on both sides of the lip channel steel 3.

The lower end of the guide rail 1 is formed into a tapered shape as shown in FIG. 2 to facilitate the sinking associated with excavation.

As shown in FIGS. 3 and 4, a panel 4 is vertically slidably engaged between the opposing lip channel steels 2 and 2 of the guide rail 1.1 adjacent in the longitudinal direction of the excavated groove A. Further, a spindle 5 as a supporting means is attached between the lip channel steels 3, 3 of the guide rails 1, 1 facing each other in the width direction of the excavated groove A, as shown in FIG.

Details of these will be described later.

As shown in FIGS. 5 and 6, the six-channel 4 is formed into a rectangular plate shape from a plurality of pipes 4a arranged in parallel and a surface material 4b covering these pipes 4a, and its lower end is excavated. Cut at an angle to facilitate sedimentation.

As shown in FIGS. 3 and 5, three guide rollers 6 are provided at both ends of the panel 4, and are inserted into the lip channel steel 2 from its upper end and roll. ing.

A gap is provided between the circumferential surface of the guide roller 6 and the side wall of the lip channel steel 2. In some cases, the sum of both gaps) is usually on the order of several mm.

In addition, as shown in FIG. 6, the guide roller 6 is located at the center in the vertical direction by a distance of about 1 mm toward the outer surface of the panel 4, that is, toward the outside of the excavated groove A, compared to the other guide rollers. installed.

The spindle 5 is attached to a turnbuckle 8 as shown in FIG.
It consists of a spindle body 5a that expands and contracts with the rotation of the turnbuckle 80, and attachment portions 5b provided at both ends of the spindle body 5a, and the attachment portions 5b are made of lip channel steel 3. The lip channel steel 3
The hole 3a and the attachment are fixed at a required height position by a pin 9 passing through the portion 5b so as not to be displaced vertically.

When constructing the above structure, first, the guide rails 1, 1 connected by the spindle 5 are assembled and erected as required in the longitudinal direction of the groove at the planned trench excavation position, and the opposing guide rails 1,
After inserting the panels 4 between 1 and 1, the inside of the assembly is excavated.

Then, the guide rail 1 and panel 4 sink due to their own weight.

The earth retaining support device for the excavated trench A is constructed by repeating the above operations.

After erection, the panel 4 will be covered with soil shoals with the distribution shown in Fig. 1, and will curve inward to the excavated trench A.

However, as mentioned above, the guide roller 6 at the center is installed slightly closer to the outside of the panel 4, so the guide roller 6 at the center
As shown in the figure, when the panel 4 is curved, all the guide rollers 6 come into contact with the inner surface of the lip channel steel 2 with equal pressure.

Therefore, a great deal of force is not required to pull out the panel 4.

As explained above, according to the present invention, a load is evenly applied to each guide roller of the panel, so that the work of pulling out the panel does not require a great deal of force.

Furthermore, since the panel itself is not forced to bend at the center, the load is not concentrated at the center, resulting in a longer service life.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the earth pressure distribution applied to the panel, Fig. 2 is a front view of the earth retention shoring device according to the present invention as seen in the longitudinal direction of the groove, Fig. 3 is a plan view showing the arrangement of the spindles, and Fig. 4 5 is a front view of the panel, FIG. 6 is a side view thereof, and FIG. 7 is a sectional view showing the state of the guide roller when the penel is bent. 1... Guide rule, 2... Lip channel steel, 4... Panel, 5... Spindle, 6... Guide roller, A: Excavation groove, D: Offset distance of guide roller.

Claims (1)

[Scope of utility model registration request] Guide rails erected at required intervals along both sides of the excavation trench so as to settle as soil is removed for excavating the trench, and panels disposed between adjacent guide rails on each side of the excavation trench; Three guide rollers are provided in the vertical direction on both sides of the panel and roll in the lip groove of the guide rail as the panel moves up and down, and a spindle connects the guide rails facing each other in the groove width direction. An earth retaining and shoring device for an excavated trench, characterized in that a guide roller at the center of the panel in the vertical direction is moved toward the outside of the excavated trench.