JPS5847086Y2 - Earth retention shoring device for excavated trenches - Google Patents

Description

[Detailed explanation of the invention] This invention is suitable for main management construction works such as city gas, water supply and sewerage, etc.
Relating to earth retention and shoring equipment for trenches excavated during management facility construction.

If the work involves excavating a trench and burying the pipe relatively deep, such as for city gas main pipes or water and sewage main pipes, it is necessary to construct an earth retaining wall by driving sheet piles, etc. After forming a trench by excavating and removing earth between the left and right opposing earth retaining walls, the pipes are suspended, and the pipes are successively connected, and after the connections are completed, they are covered with earth.

Incidentally, this in-building construction work is mainly carried out in urban areas and residential areas, and since the construction of earth retaining walls by driving sheet piles is accompanied by quite intense noise and vibration, there is a risk of causing noise and vibration pollution problems.

Therefore, it became necessary to develop a construction method for constructing earth retaining walls without noise or vibration, and as a construction method that met this demand,
The present applicant has proposed a construction method in which an erected guide rail and a panel guided by the guide rail are gradually lowered as soil is removed (see Japanese Patent Laid-Open No. 53-48310).

This construction method eliminates the severe vibrations and noise caused by sheet pile driving, but supports the opposing retaining wall with strong shoring to prevent guide rails and panels that settle during excavation from falling into the trench. There must be.

As this support, a spindle that can be freely expanded and contracted using a turnbuckle or the like is suitable.

These spindles need to be installed at multiple locations above and below the retaining wall, which sinks as the depth of the trench increases, and they also need to be installed at multiple locations at relatively short intervals in the longitudinal direction of the trench. At the same time, in order to fully exert its function as a shoring and resist earth pressure, it is necessary to lower it while maintaining a horizontal or nearly horizontal state as the opposing earth retaining wall sinks.

However, due to the imbalance in the amount of soil removed and the influence of soil quality, it is difficult to sink the opposing earth retaining walls by approximately the same amount at the same time, and countermeasures are required to address this problem.

The present invention was devised in view of the current situation, and its purpose is to provide an earth retention support device for excavated trenches that can prevent the spindle from tilting more than a predetermined angle with respect to the horizontal during trench excavation. be.

In the present invention, legs are provided at both ends of the spindle, which serves as a shoring structure, and which is placed between the opposing earth retaining walls that settle as excavation is performed, and which protrude through the spindle to the seventh floor, and whose tips are close to the guide rail. The contact members are fixed to each other so that when the spindle is tilted with respect to the horizontal at a required angle, one of the upper and lower legs comes into contact with the guide rail, thereby preventing further tilting of the spindle. It is designed to prevent

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

In Fig. 1, 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. 4. , and is configured to gradually sink as the trench A is excavated.

As shown in FIG. 3, the guide rail 1 consists of lip channel steel 2.2 that opens back to back in the strong 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. 1, a large number of holes 3a are vertically bored on both sides of the lip channel steel 3.

The lower end of this guide rail 1 is formed into a tapered shape as shown in FIGS. 1 and 2 to facilitate settling during excavation.

As shown in FIGS. 3 and 4, a panel 4 is slidably locked on the upper F between the opposing lip channel steels 2 and 2 of the guide rail 1 adjacent in the longitudinal direction of the excavated groove A. Further, as shown in FIGS. 1 and 4, a spindle 5 as a support is installed between the lip channel steels 3 and 3 of the guide rail 1 facing each other in the width direction of the excavated groove A. Abutment members 6, 6, which are a feature of the present invention, are attached to both ends of 5, respectively.

Details of these will be described later.

The panel 4 is formed into a rectangular plate shape from pipes 4a arranged in parallel and a surface material 4b covering these pipes, as shown in FIGS. Cut at an angle to make it easier.

3 and 5 on both side ends of this panel 4.
As shown in the figure, a plurality of rollers 16 are provided that are inserted into the lip channel steel 2 from its upper end and transferred, and the two central pipes 4a are provided with rollers 16 for lifting the panel 4. A locking portion 17 is provided which engages in a bayonet manner with a locking piece of a lifting tool (not shown) inserted into the pipe 4a.

As shown in FIG. 3, the spindle 5 includes a telescopic portion 5a,
A connecting locking member 5C is provided which is made of an extension rod 5b and connects both ends of the spindle 5 to the force idle rail 1.

The telescopic part 5a consists of a turnbuckle 7, and the turnbuckle 7 has a tube body 8a screwed into its outer cylinder from the end.
8b.

The extension rod 5b is a rod that can have an appropriate length depending on the groove width, and its inner end is detachably connected to the tube body 8b via a pin 9.

A short tube 8C is detachably connected to the outer end of the extension rod 5b by a pin 10.

The spindle 5 expands and contracts by rotating the turnbuckle 7.

That is, by rotating the outer cylinder of the turnbuckle 7, the tubular bodies 8a and 8b are drawn into the Tato cylinder or pushed out of the outer cylinder.

At the outer ends of the tube bodies 8a and 8c at both ends of the spindle 5, the aforementioned connecting and locking member 5C and the abutting member 6 are connected to the pins 11 and 11.
are connected to each other as described below.

As shown in FIG. 7, the contact member 6 includes a cylindrical body 6a and leg portions 6b, 6b that respectively protrude obliquely from the upper F surface of the body 6a toward the guide rail 1. As shown in FIG. 8, a tube 8a (or 8C) is inserted into the body 6a, and a tip 6C of the leg 6b is inserted into the body 6a.
is close to the groove bottom of the lip channel steel 3, and when the spindle 5 is tilted vertically by, for example, 5 degrees with respect to the horizontal, the tip 5 c
, 5c is in contact with the groove bottom of the lip channel steel 3, and is configured to prevent the spindle 5 from tilting at an angle of 5° or more.

On the other hand, as shown in FIGS. 7 and 8, the connection locking member 5C is connected to the play 1 inserted into the lip channel steel 3.
~ 13, and a stud 14 protruding from the front side of this plate 13, that is, the side facing the center of the excavated groove A, and the stud 14 is inserted into the body 6a of the contact member 6. The hole 15 of the body 6a, the hole 18 of the tube 8a (or 8C), and the hole 1 of the stud 14 are inserted into the tube 8a.
The abutment member 6 and the spindle 5 are integrally connected by the aforementioned pins 11 passing through the abutment member 6 and the spindle 5, respectively.

The pin 11 is prevented from being removed by a split pin 20.

On the back side of the plays 1 to 13, a semi-cylindrical fulcrum member 22 is fixed laterally in the center thereof, and leg pieces 23 made of hard rubber or synthetic resin are attached to the four corner positions with rivets 24, respectively. ing.

The leg piece 23 is attached to the channel steel 3 when the spindle 5 is tilted.
is compressed and elastically deformed between the bottom of the groove and the plate 13, allowing slight swinging in the vertical direction about the fulcrum member 22 of the connecting and locking member 5C.

As shown in FIG. 9, the connecting locking member 5C configured in this way is prevented from being displaced vertically to a required height position by blocks 26 fitted and fixed into the lip channel steel 3 at the top and bottom. Fixed.

To fix the block 26, a pin 27 is inserted into the block 26 through the hole 3a of the lip channel steel 3.

In the above configuration, during construction, 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 rail 1
, 1 and insert the panel 4 from above.

In this state, the inside of the assembly is excavated and the guide rail 1 and panel 4 are allowed to settle under their own weight.

At this time, if the guide rails 1, 1 facing each other in the groove width direction sink by the same amount, the tip of the leg 6b of the abutment member 6 will be lowered to the lip channel steel 3, as shown in FIG. 9A. This is the most preferable situation.

There is a difference in the amount of sedimentation between the guide rails 1 and 1, for example, the 9th
As shown in FIG. B, when the amount of sedimentation of the right guide rail 1 is large, the spindle 5 is tilted upward to the left, and the upper leg 6b of the right end abutting member 6 and the left end abutting member 6
The lower leg portions 6b of each contact the groove bottom of the lip channel steel 3.

In this state, the right guide rail 1 cannot sink any further with respect to the left guide rail 1.

The inclination of the spindle 5 at this time is, for example, 5° with respect to the horizontal direction.

When the leg portions 6b of the abutting members 6 at both ends abut against the lip channel steel 3 as shown in the figure, the amount of settling of the left guide rail 1 in FIG. 9B is increased.

Then, the spindle 5 becomes horizontal again as shown in FIG. 9A.

In addition, when the spindle 5 is tilted in the opposite direction as shown in FIG. 9C, the amount of sedimentation of the guide rail 1 on the right side in the figure may be increased.

As explained above, according to this embodiment, the abutment member prevents the spindle from tilting at a predetermined angle with respect to the horizontal, for example, 5 degrees or more, so that the spindle serving as a support is always maintained in a good condition. You can keep it.

Furthermore, since the structure is simple, it can be applied to existing equipment.

The present invention has been described above based on the preferred embodiments, but according to the present invention, it is possible to hold the spindle almost horizontally at all times.

[Brief explanation of drawings]

Fig. 1 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. 2 is a front view of the guide rail, Fig. 3 is a cross-sectional plan view of main parts showing the arrangement of the spindle, and Fig. 4. 5 is a front view of the panel, FIG. 6 is a side view of the same, FIG. 7 is an exploded perspective view showing the state of connection between the spindle and the contact member, and FIG. 8 is the same part. The cutting plan view and FIGS. 9A, 9B, and 9C are schematic diagrams each showing the state of inclination of the spindle accompanying excavation. 1...Guide rail, 4...Panel,
5... Spindle, 5a... Telescopic part,
5b... Extension rod, 5C... Connection locking member, 6... Contact member, 6a...
Body part, 6b... Leg part, 7... Turnbuckle.

Claims (1)

[Scope of utility model registration request] Guide rails that are erected at required intervals along both sides of the excavation trench so as to settle as soil is removed for trench excavation, and guide rails that are fitted vertically and slidably between adjacent guide rails in each excavation trench. In the earth retention shoring device, the earth retention shoring device is equipped with a spindle that connects guide rails facing each other in the groove width direction. abutment members having adjacent leg portions are each fixed;
The tip of the leg of each contact member is configured such that it contacts the bottom wall of the guide rail only when the spindle is tilted either up or down with respect to the guide rail at a predetermined angle with respect to the horizontal.
An earth retaining device for an excavated trench, characterized in that in a normal state in which the spindle is perpendicular to the guide rail, it is positioned with a certain gap from the bottom wall of the guide rail.