JPS603144Y2 - Earth retention shoring device for excavated trenches - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an earth retaining and shoring device for an excavated trench, and particularly to an improvement in the structure of a connecting portion between a panel used as an earth retaining wall and a spindle as a shoring member.

Conventionally, when excavating a trench to bury city gas or water and sewage mains underground, sheet piles were placed along both sides of the excavated trench, and excavation was performed between the sheet piles on both opposing sides. However, this method is not suitable for trench excavation in urban areas or at night, as it generates severe vibration and noise when driving sheet piles.

Therefore, in some cases, earth retention panels are used instead of sheet piles, and these panels are connected in the trench width direction with spindles that serve as supporting materials, and the panels are allowed to settle as soil is removed for trench excavation to retain earth. A method of constructing walls is used.

The present invention relates to the improvement of this type of earth retaining device for excavation trenches.The purpose of this invention is to have a simple structure that can ensure sufficient resistance against earth pressure, and that is connected by a spindle. To provide an earth retaining device for an excavated trench which can sufficiently absorb even if the settling states of panels are slightly different.

In this invention, a plurality of connecting fittings each having a U-shaped cross section are provided at intervals vertically on the inner surface of both ends of the panel, and a horizontal hollow member is provided at the center of the outer surface of the fittings fixed to both ends of the spindle. The connecting fitting and the spindle are connected by a pin passing through the horizontal hole of the connecting fitting and the inside of the hollow member, and the slope that contacts the bottom of the connecting fitting is attached to the upper and lower positions of the fitting via the hollow member. The plate-shaped elastic member is provided to restrict vertical movement of the spindle relative to the panel within a certain range.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In Fig. 1, numerals 1 indicate earth retaining panels, and these panels 1 are arranged vertically in large numbers consecutively along the longitudinal direction of the excavated trench A at opposing positions on both sides of the excavated trench. It gradually begins to settle.

Then, mutual panels 1 facing each other in the width direction of the excavation groove A,
A spindle 2 serving as a support member is disposed between both end portions of the spindle 1 .

As shown in FIGS. 2 to 4, the panel 1 includes a large number of hollow members 3 with square cross sections stacked vertically, and rectangular sections arranged vertically at both ends of these hollow members 3. It is formed into a rectangular plate shape from a hollow vertical member 4 having a cross section, and the hollow member 3 and the hollow member 3 and the hollow vertical member 4 are integrally welded by welding their opposing surfaces.

The lower end of the hollow vertical member 4 is cut diagonally as shown in FIG. 2, and the lower end of the hollow member 3 at the lower end is provided with a guide having a triangular cross section as shown in FIG. The material 5 is welded to form a shape in which the lower end of the panel 1 is substantially cut diagonally.

This facilitates the settling of the panel 1 during trench excavation.

As shown in FIGS. 2 and 3, a reinforcing plate 6 is welded to the upper end of the inner surface of the hollow vertical member 4, that is, the surface facing the inside of the excavation iA, and the lower part of the reinforcing plate 6 is , two connecting fittings 7 each having a U-shaped cross section are vertically spaced apart from each other.
Individually welded.

As shown in FIG. 3, a hole 8 penetrating into the interior of the hollow vertical member 4 is bored in the center of the reinforcing member 6, and by hooking a hanger (not shown) into this hole 8, the panel can be secured. 1 can be lifted.

Furthermore, horizontal holes 9 are bored in the center portions of both side walls of the connecting fitting 7, as shown in FIG.

As shown in FIGS. 1 and 2, both ends of the spindle 2 are connected between the connecting fittings 7 and 7 facing each other in the width direction of the excavated groove A through pins 10 passing through the horizontal holes 9. It is now connected.

Further, on the outer surface of the hollow vertical member 4 disposed at one side end of the panel 1, an L-shaped guide member 11 for guiding the side end of the adjacent panel 1 is provided, as shown in FIG. are fixed from top to bottom.

As shown in FIGS. 1 and 2, the spindle 2 includes a turnbuckle 12 and a tube body 1 screwed onto both ends of the turnbuckle 12.
3 and an abutment member 14 attached to the tip of each tube body 13, and is configured to expand and contract in the length direction by rotating the turnbuckle 12.

The spindle 2 is connected to the panel 1 via a pin 10 with the abutting member 14 fitted into the connecting fitting 7.

As shown in FIGS. 6 to 8, the abutting member 14 is a cylindrical body that is fixed by a pin (not shown) that is fitted onto the outer peripheral surface of the tip of the tubular body 13 and passes through a pin hole 15a. 15, a rectangular plate-shaped substrate 16 fixed to the distal end surface of the cylindrical body 15, and a cylindrical hollow member 17, an elastic member 18, and a support member 19 arranged on the outer surface of the substrate 16, respectively. ing.

The connecting portion between the cylindrical body 15 and the substrate 16 is reinforced by ribs 20 arranged on the circumferential surface of the cylindrical body 15, and the connecting portion between the cylindrical body 15 and the substrate 16 is shown in FIG. 7th
As shown in the figure, both sides are cut out to provide square holes 15b.

The hollow member 17 is fixed laterally to the center of the outer surface of the substrate 16, and the pin 10 for fixing the spindle 2 to the panel 1 side is loosely fitted into the interior of the hollow member 17. It looks like this.

Further, the supporting members 19 are fixed in pairs at required intervals through the hollow member 17 at the upper and lower positions thereof, and the outer surface side of each supporting member 19, that is, the surface facing the bottom of the connecting fitting 7, As shown in FIG. 6, it is formed into an inclined surface that gradually approaches the substrate 16 side toward the upper and lower ends.

A connecting plate 21 that interconnects the two support members 19 is fixed to this surface, and the plate-shaped elastic member 18 made of rubber or the like is adhered and fixed to the outer surface of this connecting plate 21. .

The connecting plate 21 is an inclined plate that gradually approaches the substrate 16 from the edge adjacent to and along the hollow member 17 to the edge farthest from the hollow member, and the elastic member 18 on the outer surface also Similarly, it is formed as an inclined plate.

The hollow member 17 is retracted from the most protruding part of the elastic member 18, and the most protruding part of the elastic member 18 contacts the bottom of the connecting fitting 7.

Therefore, in a normal state, that is, when the subsidence behavior of the panels 1 connected by the spindle 2 is the same, only the portion of the elastic member 18 on the hollow member 17 side is in contact with the bottom of the connecting fitting 7.

Therefore, within the range where the other part of the elastic member 18 comes into contact with the bottom of the connecting fitting 7 and is elastically deformed, the panel 1
The vertical movement of the spindle 2 is allowed.

Further rocking is prevented by the rigidity of the support member 19.

That is, the support member 19 acts as a stopper that restricts the vertical swing range of the spindle 2.

In the construction described above, at the time of construction, first, the panels 1.1 connected by the spindle 2 are assembled and erected as required in the longitudinal direction of the groove at the planned trench excavation position, and the inside of this assembly is excavated.

Then, the panel 1 gradually sinks due to its own weight and forms the retaining wall of the excavated trench A.

By the way, a pair of panels 1.1 that settle due to their own weight are
Depending on the state of excavation and the state of the excavated ground, the settling speeds of both panels may not necessarily be the same, and only one panel 1 may settle somewhat faster.

In such a state, if the panel 1 and the spindle 2 are rigidly connected, the load due to the mutual displacement of the panels 1.1 will be applied to the connection between the panel 1 and the spindle 2. There is a risk that the parts or the spindle 2 will be damaged.

However, in the case of the present invention, since the spindle 2 can be moved vertically relative to the panel 1, even if the sedimentation speeds of the panels 1 and 1 are slightly different, this can be sufficiently absorbed. .

In addition, since the elastic member 18 is arranged at the contact portion of the spindle 2 with the bottom of the connecting fitting 7, the impact when the spindle 2 and the panel 1 come into contact can be sufficiently absorbed.
Damage to parts can be prevented.

Elaborating this further, when the spindle 2 is tilted relative to the panel 1, the abutment member 14 can freely pivot around the pin 10 without any resistance, thus Even if the panel 1.degree. 1 sinks unevenly, the spindle 2 and the abutment member 14 follow it very smoothly.

When the angle of inclination of the spindle with respect to the panel reaches its limit, the outer surface of the connecting plate 21 comes into surface contact with the bottom surface of the connecting fitting 7 via the elastic member 18 to prevent further inclination.

Then, the elastic member 18 is compressed for the first time and produces a cushioning effect.

The compression of the elastic member 18 at this time is simple compression that occurs almost uniformly over the entire surface, so that no unequal compressive force or shear force is applied to the elastic member, and the elastic member can withstand use for a long time.

Once the trench has been dug in this manner, a buried pipe or the like is laid in the excavated trench A, and after laying, the panel 1 is pulled out and buried.

The pulled out panel 1 is transported to the trench excavation tip side and used again.

The present invention has been explained above based on the preferred embodiments. According to the present invention, it is possible to secure sufficient strength against earth pressure with a simple structure, and furthermore, it is possible to secure sufficient strength against earth pressure with a simple structure. Even if the sedimentation behavior is slightly different, this can be sufficiently absorbed.

In addition, in this invention, there is almost no resistance when the spindle and the abutting members at its ends tilt relative to the panel until it reaches the limit of rotation, so the spindle smoothly adjusts to the average subsidence of both panels. At the limit of rotation, the elastic member comes into contact with the connecting fitting and is compressed to perform a buffering effect.At this time, almost uniform simple compression acts on the elastic member, so the elastic member can be used for a long time.

[Brief explanation of drawings]

Figure 1 is a plan view showing the first embodiment of the present invention, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a sectional view taken along the line ■-■ in Figure 1. A cross-sectional perspective view showing the structure of the hollow material part constituting the panel, FIG. 5 is an enlarged partial cross-sectional view of a part of FIG. 1,
Fig. 6 is a partially sectional front view of the contact member c, Fig. 7 is a partially sectional plan view of Fig. 6, Fig. 8 is a left side view of Fig. 6, and Fig. 9 shows the panel and spindle. FIG. 3 is a front view of a pin for connection. 1...Panel, 2...Spindle, 7
...Connection fitting, 9...Horizontal hole, 10...
... Zen, 14, 24 ... Contact member, 15.
is...Cylinder, 16, 26...Substrate,
17, 27...Hollow material, 18, 19...
・Supporting member, A... Excavation groove.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An earth retaining wall structure including panels arranged along both sides of an excavated trench so as to settle as soil is removed for trench excavation, and panels facing in the width direction of the trench. In an excavated trench earth retaining support device that includes a spindle as a supporting material placed between the earth retaining walls, connecting fittings 7 having a U-shaped cross section are provided above and below the inner surface of the earth retaining wall structure, and the spindles 2 are A horizontal hollow member 17 is fixed to the center of the outer surface of a substrate 16 fixed to both ends, and the connecting member and the spindle are connected by a pin 10 passing through the horizontal hole 9 of the connecting member and the inside of the hollow member. The vertical position with respect to the hollow material on the outer surface of the board is as follows:
A pair of connecting plates 21 are fixed through the support member 19 so as to be parallel to the axis of the horizontal hole of the connecting fitting, and these connecting plates extend from the edge adjacent to and along the hollow member 17 The plate-shaped elastic members 18 are attached to the outer surfaces of these connecting plates, and the elastic members are also inclined in the same way as the connecting plates. and the end edge of the elastic member along the hollow member projects outward from the hollow member, the end edge of the elastic member along the hollow member contacts the bottom of the connecting fitting, and the hollow member is connected. An earth retention shoring device for an excavated trench, characterized in that it does not touch the bottom of the metal fittings. 2. The earth retention support device for an excavated trench according to claim 1, wherein the hollow member 17 is a cylindrical member.