JPS5848691B2 - Earth retention device for trench excavation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an earth retaining device for excavating a trench in which a sewer main pipe or the like is buried.

Normally, when excavating a trench, a shovel-type excavator is used to remove soil to the required width and depth to obtain the trench.

When excavating this trench, unless the ground is particularly strong, steel sheet piles are driven to match the width of the trench to form an earth retaining wall.

However, driving steel sheet piles is accompanied by severe noise and vibration.
It causes pollution problems in urban areas.

Further, since the side edges of the steel sheet piles are engaged with each other, each sheet pile is restrained relative to the adjacent sheet pile and cannot slide completely freely.

For this reason, if a cross pipe is buried underground,
The sheet pile at the corresponding position must not be allowed to settle, but by driving an adjacent sheet pile, the sheet pile will also settle, and there is a risk that the transverse pipe may be damaged or cut.

The present invention has been made in order to solve these conventional difficulties, and its purpose is to eliminate excavation excavation that does not involve noise and vibration that would cause pollution problems, and that does not cause damage to various cross pipes, etc. To provide soil retention equipment.

Embodiments of the present invention will be described below based on the drawings.

1 to 7 show a first embodiment of the invention.

As shown in the plan view of FIG. 1, the earth retaining device according to this embodiment includes a pair of beams 1 arranged along both sides of a trench to be excavated, and a connecting member that connects both beams 1 in the trench width direction. 2,
and a corrugated plate 3 arranged outside each beam 1.

The beam 1 is formed of H-beam steel as shown in FIGS. The connecting member 2 is composed of a thick tube 2a in the shape of a rectangular tube, and a thin tube 2b that protrudes from the opposite end of the other beam 1 and is inserted into the thick tube 2a.
The length can be adjusted by adjusting the degree of insertion of both tubes 2a, 2b and passing the pin 2c through.

A plurality of guide members 4 are provided protruding from the outer surface of the beam 1 at arbitrary intervals in the longitudinal direction thereof.

This guide member 4, as shown in FIGS. 4 to 6,
It is composed of a plate 4a projecting perpendicularly to the beam 1 and ribs 4b for reinforcing it, and the protruding tip of the plate 4a has grooves at its upper and lower ends as shown in FIGS. 5 to 7. Round bars 5 perpendicular to the plate bodies 4a are welded to each other, and rollers 6 that freely rotate in parallel to the extending direction of the beam 1 are provided slightly inside the bars.

The length of the nine bars 5 is slightly shorter than the diameter of the roller 6, as shown in FIG.

On the other hand, as shown in FIGS. 1 and 2, the corrugated plate 3 is constructed by arranging three unit plates 7 shown in FIG. 3 in succession in the longitudinal direction of the groove with their side ends in contact with each other. It is structured.

Each unit plate 7 has a reinforcing plate 8 welded to the center of the corrugated plate material, and guide rails 9 each having a lip groove shape in the vertical direction are welded to both sides of the reinforcing plate 8, as shown in FIG.

As shown in FIG. 7, a round bar 5 of the guide member 4 and a roller 6 are fitted into the guide rail 9 so as to be slidable up and down.

Thus, each unit plate 7 is capable of sliding only in its own vertical direction with its side ends in contact with the side ends of adjacent unit plates.

In addition, in the figure, 10 is a reinforcing member of the beam 1.

Next, the effect will be explained.

When excavating a trench, first, a trench with a predetermined width and a relatively shallow depth, for example, about 1.5 m, is excavated at the planned excavation location.

On the other hand, a frame member made by connecting the beams 1 with the connecting members 2 on the ground is placed in the groove.

The corrugated plate 3 is then inserted into the groove with the guide rail 9 engaged with each guide member 4 of the beam 1, and its lower end is pushed somewhat into the soil.

Next, earth is excavated and removed between the opposing beams 1.

Then, the corrugated plate gradually sinks along the guide member 4 due to its own weight.

At this time, if the corrugated plate 3 is difficult to sink due to earth pressure, its upper end is pressed with a packet of an excavator or the like.

Repeat this operation until the trench reaches a predetermined depth, then lower the main sewer pipe, etc. into the trench.

First, the corrugated plate 3 is pulled out, and then the beam 1 is pulled up and buried.

This operation is carried out sequentially in the longitudinal direction of the trench, and the lifted beam 1, corrugated plate 4, etc. are used repeatedly as the trench is dug.

When excavating trenches, be sure to dig into a relatively shallow part of the ground (1 minute from the ground surface).
．． In some cases, water supply and gas service pipes are buried perpendicular to the trench (approximately 5 m).

In such a case, the unit plate 7 at that position is left and only the other unit plates 7 are allowed to settle.

At this time, since the unit plates 7 are in contact only at their side ends, mutual independent movement of the unit plates 7 is ensured.

According to the embodiment described above, unlike the sheet piles, the unit plates only have their side edges in contact with each other, so that they can freely slide up and down independently.

Therefore, when the sedimentation caused by excavation is insufficient, a small pressing force is sufficient to be applied to the unit plate as an auxiliary force.

Further, since each unit plate moves up and down independently, even if there is a cross pipe when excavating a trench, it is possible to avoid this while excavating the trench.

Since the corrugated plates are always restrained to take a constant position with respect to the beam in the longitudinal direction of the groove, there is no possibility of the corrugated plates being twisted together.

Further, since a round bar and a roller are provided at the tip of the guide member, the corrugated plate moves up and down smoothly with respect to the beam.

8 to 14 show other embodiments of the present invention, which will be described below.

Similar to the previous embodiment, the earth retaining device according to this embodiment includes a pair of beams 11 arranged along both sides of a trench to be excavated;
It is composed of a connecting member 12 that connects both beams 11 in the groove width direction, a corrugated plate 13 arranged outside each beam 11, and the like.

As shown in FIG. 13, the beam 11 is made of H-shaped steel, and a reinforcing material 14 is welded to the outer surface of the outer flange.

Further, as shown in FIG. 8, the connecting member 12 includes a large-diameter tube 15 and a small-diameter tube 16 that are fixed to each other by a pin 17, and an extension rod 18 that is connected to the small-diameter tube 16. The length of the connecting member 12 can be adjusted by increasing or decreasing the number of extension rods 18 and adjusting the pin 17.

As shown in FIGS. 8 to 10, the corrugated plate 13 has a trapezoidal bent portion in the center and has a chevron-shaped bent portion 19a and a dogleg-shaped bent portion 19b at both ends. Consisting of six unit plates 19 consecutively arranged in the longitudinal direction of the groove,
The chevron-shaped bent portions 19a and the dogleg-shaped bent portions 19b of the side edges of adjacent unit plates 19 contact and slide with each other with the chevron-shaped bent portions positioned on the outside, as shown in FIG. It is free.

Furthermore, a lip groove-shaped guide rail 20 is vertically fixed to the inside of the trapezoidal bent portion of the center shaft of each unit plate 19, and a guide rail 20 in the form of a lip groove is fixed to the upper end of the guide rail 20 for lifting the unit plate 19, as shown in FIG. The plate 20a is welded.

Therefore, a guide member 21 protruding outward from the beam 11 is fitted and locked into the guide rail 20 so that it can slide up and down.

This guided member 21 is shown in FIGS. 11, 13 and 1.
As shown in FIG.
It consists of a channel steel 21C that is fixed in the vertical direction to the outer end of the plate 1a and opens outward, and wheels 22 that can freely rotate parallel to the beam 11 are provided at the upper and lower ends of the plate 21a, and Rollers 23 rotatable at right angles to the beam 11 are attached to the upper and lower ends of the channel steel 21c, respectively.

Then, when the guide member 21 is fitted into the guide rail 20, the wheels 22 and the rollers 23 are connected to the guide rail 20.
It is designed to roll within 0.

As shown in FIGS. 9 and 10, a plurality of reinforcing ribs 24 are welded to one outer side of the guide rail 20 at required intervals in the vertical direction. The tip of a pin 25, which can move forward and backward, is fitted into the unit plate 19 to restrict free vertical sliding of the unit plate 19.

As shown in FIGS. 11 and 12, this pin 25 has a handle 26 protruding from it, and the beam 11 is provided with a stopper 27, which rotates the handle 26 by 90 degrees and presses it outward. The protruding state of the pin 25 is maintained by rotating it 90 degrees in the opposite direction and engaging the stopper 2γ.

To retract the pin 25, perform the operation opposite to the above.

Next, the effect will be explained.

When excavating a groove, a groove with a predetermined width and a depth of, for example, about 1.5 m is excavated at the planned excavation position.

On the other hand, on the ground, the beams 11 are connected by connecting members 12 to form a framework, and this is placed in the groove.

Next, the guide rail 2 is attached to the guided member 21 of the beam 11.
Insert the corrugated plate 13 into the groove with 0 engaged,
Push its lower end somewhat into the soil.

Next, when the space between the opposing beams 11 is excavated and removed, the corrugated plate 13 gradually sinks due to its own weight.

At this time, if the corrugated plate 13 does not settle down sufficiently due to the soil, its upper end is lightly pressed with an excavator packet or the like.

冫 Repeat this operation until the trench is, for example, 4 meters deep, then lower the main sewer pipe, etc. into the trench.

First, the corrugated plate 13 is pulled out, and then the beam 1
1 and then fill it up.

This operation is performed sequentially in the longitudinal direction of the trench, and the lifted beam 111, corrugated plate 13, etc. are used repeatedly as the trench is dug.

When excavating trenches, be sure to dig into a relatively shallow part of the ground (1 minute from the ground surface).
．． In some cases, water supply and gas service pipes are buried perpendicular to the trench (approximately 5 m).

In such a case, first, the pin 25 is fitted between the reinforcing ribs 24 to restrict the free vertical movement of the unit plate 19, and only the other unit plates 19 are allowed to settle.

At this time, since the unit plates 19 are only in contact with their side edges, independent sliding movement of the unit plates 19 with respect to each other is ensured.

As explained above, this embodiment can be expected to have the same effect as the previous embodiment, and the necessary lowering of the unit plate can be completely regulated by the pin, so there is no possibility of accidentally lowering it and damaging the buried pipe. There is no fear.

The present invention has been described above based on preferred embodiments. According to the present invention, trenches can be excavated without noise and vibration that would cause pollution problems during construction, and without damaging various cross pipes, etc. An earth retaining device is provided that can do the following.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
Figure 3 is a cross-sectional view of the unit plate, Figure 4 is a view taken along the line IV-IV in Figure 1, and Figure 5 is a cross-sectional view of the unit plate.
Figure 6 is an enlarged view of part V in the figure, Figure 6 is an enlarged view of part ■ in Figure 2, Figure 7 is an enlarged view of part ■ in Figure 1, and Figure 8 is a plan view showing another embodiment of the present invention. , FIG. 9 is an enlarged plan view of the corrugated plate, the first
Figure 0 is a front view of Figure 9, Figure 11 is an enlarged view of the M section in Figure 8, Figure 12 is an enlarged view of the pin part, Figure 13 is an enlarged view of the guide member, Figure 14 is Figure 13. FIG. 1, 11... Beam, 2, 12... Connecting member, 3, 13... Corrugated plate, 4, 21
...Guide member, 7,19...Unit plate, 9,20...Guide rail.

Claims (1)

[Claims] 1 (a) a pair of beams arranged along both sides of a trench to be excavated; (b) a connecting member that connects both beams in the trench width direction;
(c) A plurality of guide members projecting outward from each beam at intervals in the longitudinal direction; (d) A state in which the guide members are arranged on the outside of each beam and their side edges are slidably in contact with each other. (e) A corrugated plate consisting of a plurality of unit plates arranged continuously in the longitudinal direction of the groove; A trench excavation earth retaining device comprising: a guide rail that allows vertical movement relative to a beam; 2. The earth retaining device according to claim 1, wherein the guide member comprises a reinforced plate perpendicular to the beam and a roller provided at the outer end of the plate. 3. The earth retaining device according to claim 1 or 2, wherein the beam is made of H-beam steel.