JP2019173422A - Steel earth retaining material installation tool and liner plate installation method - Google Patents

Abstract

To realize a steel earth retaining material installation tool and a liner plate installation method capable of suitably installing a liner plate on a shaft wall while protecting the shaft wall of a shaft during excavation.SOLUTION: Since a shield material and a movable plate of the steel earth retaining material installation tool can slide relative to each other, by repeatedly installing steel earth retaining material installation tool on a wall of a shaft, joining a liner plate on the movable plate placed on a lower side of the shield material of the steel earth retaining material installation tool installed on a shaft wall, lowering the shield material along the shaft wall by its own weight while excavating the bottom of the shaft, releasing the movable plate and the liner plate and lowering the movable plate to the lower side of the shield material, and joining a new liner plate on the movable plate, the liner plate can be suitably installed on the shaft wall while protecting the shaft wall with the shield material of the steel earth retaining material installation tool.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel earth retaining material installation tool used for installing a liner plate on a shaft wall of a vertical shaft, and a liner plate installation method using the steel earth retaining material installation tool.

Conventionally, liner plates used for lining materials such as shafts and water collection wells are known.
For example, when constructing a shaft for the deep foundation method, a liner plate is installed on the shaft wall of the shaft to perform earth retaining.

Until the liner plate is installed, a construction method using a steel blade is known to protect the wall of a shaft being excavated (see, for example, Patent Document 1).
In this method, when the shaft is shallow, a plurality of steel blades are arranged in a cylindrical shape along the wall with the blade body protruding from the bottom of the shaft, and each steel blade is sequentially placed on the bottom of the shaft. While press-fitting into the shaft, the inner side of the cylindrical steel blade is excavated to advance the shaft, and the liner plate is sequentially installed while protecting the wall.

JP 7-42478 A

  However, in the case of the construction method disclosed in Patent Document 1, since the steel blade edge is press-fitted into the bottom of the shaft using a jack, the steel blade edge cannot be pressed vertically if there is a problem with the jack. In addition, there was a problem that when the jack broke down, it was necessary to interrupt the construction.

  An object of the present invention is to provide a steel earth retaining material installation tool and a liner plate installation method capable of suitably installing a liner plate on a pit wall while protecting a pit wall during excavation. is there.

In order to achieve the above object, a steel earth retaining material installation instrument which is one invention according to the present application,
A cutting edge is provided along the lower end, and one surface can be installed along the shaft wall of the shaft,
A movable plate connected to the other surface of the shield material so as to be slidable in the vertical direction;
With
The movable plate is connected so as to have a movable range of at least two liner plates in the vertical direction, and the liner plate is configured to be connectable to the upper part and the lower part thereof.

If the steel earth retaining material installation tool having such a configuration is installed on the shaft wall of the shaft, the wall can be protected so as to be covered with a shield material.
And since the movable plate is connected to the shield material so as to have a movable range of at least two liner plates, if the movable plate is disposed on the lower side of the shield material, the movable plate is placed on the movable plate. A liner plate can be placed or connected, and if a movable plate is placed on the top side of the shield material, a liner plate can be placed or connected under the movable plate. it can.
The movable plate is slidably connected to the shield material, and the shield material and the movable plate are slidable with respect to each other. Installing (first step), joining the liner plate on the movable plate with the movable plate placed on the lower side of the shield material of the steel earth retaining material installation tool installed on the shaft wall of the shaft (Second step), in order to dig up the bottom of the shaft, the shield material along the shaft wall of the shaft is lowered relative to the movable plate by its own weight (third step), Release the joint between the movable plate and the liner plate and slide the movable plate to the lower side of the shield material (step 4). Then, if a new liner plate is joined onto the movable plate (fifth step), the shaft wall of the shaft being excavated can be shielded with a steel earth retaining material installation tool. The liner plate can be suitably installed on the pit wall while protecting.

Also, preferably
The other surface of the shield material is provided with a rail member extending vertically.
The movable plate is provided with a guide member that is movably engaged along the rail member.

  If it has a slide movement mechanism composed of a rail member provided on the shield material and a guide member provided on the movable plate, the movable plate can be lowered relative to the shield material, On the other hand, the shield material can be lowered relatively.

Also, other inventions related to this application are:
It is an installation method of a liner plate using the above-mentioned steel earth retaining material installation instrument,
A first step of excavating a shaft having a depth corresponding to the steel earth retaining material installation tool, and installing the steel earth retaining material installation device along the shield material along the wall of the shaft;
In a state where the movable plate is disposed on the lower side of the shield material, a liner plate is disposed along the other surface of the shield material, and a lower portion of the liner plate is joined to the upper portion of the movable plate. Process,
A third step of lowering the shield material along the shaft wall of the shaft relative to the movable plate by its own weight so as to follow the bottom of the shaft.
A fourth step of releasing the joining of the movable plate and the liner plate and sliding the movable plate to the lower side of the shield material;
A new liner plate is disposed along the other surface of the shield material, a lower portion of the new liner plate is joined to an upper portion of the movable plate, and an upper portion of the new liner plate is connected to an existing liner plate. A fifth step of joining the lower part;
I was prepared to.

With the liner plate installation method having such a configuration, the liner plate can be suitably installed on the pit wall while protecting the pit wall of the shaft being excavated with the shield material of the steel earth retaining material installation tool.
In particular, if the steel earth retaining material installation tool is installed in the vertical shaft in a vertical posture in advance, the steel earth retaining material installation device lowered by its own weight as the shaft bottom of the vertical shaft is dug Continue to maintain posture.
The liner plate can be installed on the shaft wall of the shaft using the steel earth retaining material installation device installed in the vertical position in the vertical shaft, so a plurality of liner plates installed in the vertical direction The cylindrical earth retaining structure comprised by can be suitably constructed in the shaft.

Also, preferably
In the fifth step, the new liner plate is joined to the existing liner plate in a staggered arrangement.

  By doing so, it is possible to construct a retaining structure having a stable structure in which a plurality of liner plates are assembled in a staggered arrangement.

Also, preferably
In the shaft, a cylindrical wall structure made up of a plurality of steel earth retaining material installation tools is installed,
In the third step and the fourth step, each steel earth retaining material installation tool constituting the wall structure is individually lowered.

  For example, when there is a hard-to-drill or easy-to-drill part at the bottom of a vertical shaft and it is not possible to proceed evenly, each steel earth retaining material constituting the wall structure is lowered individually. If the method to make is taken, work can be advanced so that the steel earth retaining material installation instrument may be lowered sequentially.

Also, preferably
In the shaft, a cylindrical wall structure made up of a plurality of steel earth retaining material installation tools is installed,
In the third step and the fourth step, the plurality of steel earth retaining material installation tools constituting the wall structure are lowered integrally.

  If the wall structure itself is vertically lowered, a plurality of steel earth retaining material installation tools can be uniformly lowered vertically.

  ADVANTAGE OF THE INVENTION According to this invention, a liner plate can be suitably installed in the pit wall, protecting the pit wall of the shaft during excavation.

They are the front view (a) which shows the steel earth retaining material installation instrument of this embodiment, a top view (b), and sectional drawing (c). It is explanatory drawing regarding the movable range of the movable plate of the steel earth retaining material installation instrument. It is an enlarged view of the slide movement mechanism of the steel earth retaining material installation instrument. It is a perspective view which shows the liner plate used for the lining material of a shaft in partial cross section. It is explanatory drawing (a) (b) (c) (d) (e) (f) which shows the procedure of the installation method of the liner plate of this embodiment. It is a top view which shows the cylindrical wall structure comprised with multiple (six) steel earth retaining material installation instrument. It is explanatory drawing (a) (b) (c) (d) (e) which shows the procedure of the modification of the installation method of a liner plate.

  Hereinafter, embodiments of a steel earth retaining material installation tool and a liner plate installation method according to the present invention will be described in detail with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

  As shown in FIGS. 1A, 1B, 1C, 2 and 3, for example, the steel earth retaining material installation instrument 100 of the present embodiment has one surface along the shaft wall of the shaft. A shield member 10 to be installed and a movable plate 20 slidably connected to the other surface of the shield member 10 are provided.

The shield material 10 is, for example, a steel plate curved in an arc shape, and a blade edge 11 is provided at the lower end thereof.
The blade edge 11 is fixed to the lower end portion of the shield material 10 with a sharp tip facing downward. The blade edge 11 has a curved shape following the arc shape of the shield material 10.
Then, when the steel earth retaining material installation tool 100 is installed on the shaft wall of the shaft, one surface of the shield material 10 curved outwardly is installed toward the shaft wall of the shaft.

The movable plate 20 is connected to the shield material 10 so as to be slidable in the vertical direction.
As shown in FIG. 2, the movable plate 20 can be switched between a lower-side arrangement and an upper-side arrangement of the shield material 10.
The movable plate 20 has a movable range of at least two liner plates in the vertical direction.
That is, when the movable plate 20 of the steel earth retaining material installation instrument 100 is disposed on the lower side of the shield material 10, one liner plate 1 described later can be installed on the movable plate 20, and the movable plate 20 can be installed. Is placed on the upper side of the shield member 10, one liner plate 1 described later can be installed under the movable plate 20.
Further, a liner plate 1 to be described later can be connected to the upper and lower portions of the movable plate 20.

The slide moving mechanism of the movable plate 20 is composed of a rail member 30 and a guide member 40, for example.
Specifically, as shown in FIGS. 1A, 1 </ b> B, and 3 </ b> C, a rail member 30 that extends vertically is provided on the other surface of the shield member 10. Is provided with a guide member 40 that is movably engaged along the rail member 30, and the movable member 20 is moved relative to the shield member 10 so that the guide member 40 moves along the rail member 30. It is designed to slide up and down.
In other words, the shield member 10 can move up and down relatively with respect to the movable plate 20.

In particular, the movable plate 20 of the present embodiment is substantially the same as the liner plate 1 used for the shaft lining material.
For example, as shown in FIG. 4, the liner plate 1 includes a corrugated steel plate 2 curved in an arc shape and axial flanges 3 disposed on both the left and right sides of the corrugated steel plate 2. Further, the upper end portion and the lower end portion of the corrugated steel sheet 2 are each formed as a circumferential flange 4.
The axial flange 3 and the circumferential flange 4 are provided with connecting holes 3a and 4a, respectively. It is possible to construct a cylindrical earth retaining structure in the shaft by bolting the plurality of liner plates 1 in the vertical and horizontal directions using the connecting holes 3a and 4a.

The movable plate 20 having substantially the same structure as the liner plate 1 has a circumferential flange 21 at its upper end and lower end, and the circumferential flange 21 is provided with a connecting hole 21a.
The liner plate 1 can be bolted to the circumferential flange 21 of the movable plate 20.

  Next, the installation method of the liner plate using the steel earth retaining material installation instrument 100 of the present embodiment will be described.

First, as shown in FIG. 5 (a), a shaft having a depth corresponding to the steel earth retaining material installation tool 100 is excavated, and the steel earth retaining material is installed along the shield wall 10 along the wall W of the shaft. The appliance 100 is installed (first step).
For example, as shown in FIG. 6, six steel earth retaining material installation tools 100 are installed on a shaft wall W of a vertical shaft, and the cylindrical wall structure is constituted by the six steel earth retaining material installation tools 100. 90 is installed in the shaft.
The wall structure 90 including the steel earth retaining material installation tool 100 protects the shaft wall W of the shaft being excavated until the liner plate 1 is installed on the shaft wall W of the shaft.
Here, the steel earth retaining material installation device 100 (wall structure 90) installed in the vertical shaft is in a vertical posture in which the movable plate 20 connected to the shield material 10 is slid in the vertical direction so as to be slidable up and down. It is installed to become.

Next, as shown in FIG. 5B, in a state where the movable plate 20 is disposed on the lower side of the shield material 10, the liner plate 1 is disposed along the other surface of the shield material 10, and the liner plate is disposed. The lower circumferential flange 4 is joined to the upper circumferential flange 21 of the movable plate 20 (second step).
In addition, the liner plate 1 installed in the opening periphery of the shaft is fixed to an opening periphery portion of the shaft (for example, reaction force concrete placed in the opening periphery of the shaft) by a well girder (not shown).

Next, as shown in FIG. 5 (c), the shield material 10 along the shaft wall W of the shaft is moved relative to the movable plate 20 by its own weight so as to advance the shaft bottom of the shaft. Lower (third step).
At this time, the bottom of the well is dug so as to lower the shield material 10 until the movable plate 20 is arranged on the upper side of the shield material 10.
Thus, after the shield material 10 of the steel earth retaining material installation instrument 100 is lowered, the shaft wall W of the shaft is protected by the liner plate 1 joined to the upper part of the movable plate 20.
Here, the liner plate 1 adapted to protect the shaft wall W of the shaft becomes the existing liner plate 1 installed on the shaft wall W of the shaft.

  Next, as shown in FIG. 5D, the joining of the movable plate 20 and the existing liner plate 1 is released, and the movable plate 20 is slid to the position on the lower side of the shield material 10 (fourth step).

Next, as shown in FIG. 5E, a new liner plate 1 is installed between the movable plate 20 and the existing liner plate 1.
Specifically, a new liner plate 1 is disposed along the other surface of the shield member 20, and the lower circumferential flange 4 of the new liner plate 1 is replaced with the upper circumferential flange 21 of the movable plate 20. Then, the upper circumferential flange 4 of the new liner plate 1 is joined to the lower circumferential flange 4 of the existing liner plate 1 (fifth step).
Here, the new liner plate 1 is joined to the existing liner plate 1 in a staggered arrangement.

And the operation | work of the 3rd process (refer FIG.5 (c)) to the 5th process (refer FIG.5 (e)) mentioned above is carried out to each steel soil-resisting material installation instrument 100 (in this embodiment, six steel soil-residues). To the material installation tool 100).
Thus, as shown in FIG. 5 (f), when all the steel earth retaining material installation tools 100 arranged on the entire circumference of the pit wall W are lowered by one step, the first pit is placed on the pit wall W of the shaft. A liner plate 1 can be installed.

Thereafter, the work from the third step (see FIG. 5 (c)) to the fifth step (see FIG. 5 (e)) is repeated, so that the steel earth retaining material installation tool 100 (wall structure 90) is removed. While being lowered step by step, the second stage liner plate 1, the third stage liner plate 1, etc. are sequentially installed.
Thus, when a shaft is excavated to a predetermined depth and a plurality of liner plates 1 are installed on the wall W, a cylindrical earth retaining structure constituted by a plurality of liner plates 1 is constructed in the shaft. be able to.

  Thus, if it is the installation method of the liner plate using the steel earth retaining material installation instrument 100 of this embodiment and the steel earth retaining material installation instrument 100, while protecting the pit wall W of the shaft under excavation. The liner plate 1 can be suitably installed on the pit wall W.

In particular, the steel earth retaining material installation device 100 previously installed in the vertical shaft in a vertical posture is lowered by its own weight as the shaft bottom of the shaft is advanced, so that the steel earth retaining material installation device is provided. 100 keeps a vertical posture.
In this way, the liner plate 1 can be installed on the shaft wall W of the vertical shaft using the steel earth retaining material installation device 100 installed in a vertical posture in the vertical shaft. A cylindrical earth retaining structure composed of the liner plate 1 can be suitably constructed in the shaft.

On the other hand, in the case of the conventional technology in which a steel blade is press-fitted into the bottom of the shaft using a jack, the posture of the jack is kept vertical, or the forward / backward movement direction of the jack is adjusted to the vertical direction. It had to be complicated.
If there is a deviation in the posture or orientation of the jack in the prior art, the steel blade can not be press-fitted vertically, so the liner plate cannot be installed properly (the liner plate cannot be installed vertically), That could be a problem.
On the other hand, with the steel earth retaining material installation instrument 100 according to the present invention (liner plate installation method), it is easy to maintain the steel earth retaining material installation instrument 100 installed in the shaft in a vertical posture, and the shaft of the shaft The liner plate 1 can be properly installed on the wall W.

The present invention is not limited to the above embodiment.
In the said embodiment, although the procedure (refer FIG.5 (c)-FIG.5 (e)) which dries each steel earth retaining material installation instrument 100 which comprises the wall structure 90 was demonstrated to the example, For example, as shown in FIGS. 7A to 7E, a plurality of steel earth retaining material installation tools 100 constituting the wall structure 90 may be lowered integrally (particularly, FIG. 7 (c) (d)).

For example, as shown in FIG. 7 (c), a plurality of shield members 10 along the shaft wall W of the shaft are caused by their own weight so that the bottom of the shaft is uniformly excavated and advanced. As shown in FIG. 7D, the movable plate 20 and the existing liner plate 1 are unbonded as shown in FIG. You may make it slide to the arrangement | positioning.
In this case, the shield members 10 and the movable plates 20 of the steel earth retaining material installation tool 100 installed adjacent to each other may be joined. In order to easily lower the plurality of shield materials 10 and the plurality of movable plates 20 uniformly, the adjacent shield materials 10 and the adjacent movable plates 20 are preferably joined.

Thus, if the wall structure 90 itself is lowered vertically, the plurality of steel earth retaining material installation tools 100 can be lowered vertically.
Even in such a construction procedure, the liner plate 1 can be installed on the pit wall W while protecting the pit wall W of the shaft being excavated.

  In the above embodiment, the movable plate 20 of the steel earth retaining material installation tool 100 has substantially the same structure as the liner plate 1, but the present invention is not limited to this. The shape of the movable plate 20 is arbitrary as long as the movable plate 20 is a plate member capable of bolting the liner plate 1.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Liner plate 2 Corrugated steel plate 3 Axial flange 3a Connection hole 4 Circumferential flange 4a Connection hole 10 Shielding material 11 Blade edge 20 Movable plate 21 Circumferential flange 21a Connection hole 30 Rail member 40 Guide member 90 Wall structure 100 Made of steel Earth retaining material installation equipment

Claims (6)

A cutting edge is provided along the lower end, and one surface can be installed along the shaft wall of the shaft,
A movable plate connected to the other surface of the shield material so as to be slidable in the vertical direction;
With
The movable plate is connected so as to have a movable range of at least two liner plates in the vertical direction, and a steel earth retaining material is configured so that a liner plate can be connected to an upper portion and a lower portion thereof. Installation equipment. The other surface of the shield material is provided with a rail member extending vertically.
2. The steel earth retaining material installation tool according to claim 1, wherein the movable plate is provided with a guide member movably engaged along the rail member. A method for installing a liner plate using the steel earth retaining material installation instrument according to claim 1 or 2,
A first step of excavating a shaft having a depth corresponding to the steel earth retaining material installation tool, and installing the steel earth retaining material installation device along the shield material along the wall of the shaft;
In a state where the movable plate is disposed on the lower side of the shield material, a liner plate is disposed along the other surface of the shield material, and a lower portion of the liner plate is joined to the upper portion of the movable plate. Process,
A third step of lowering the shield material along the shaft wall of the shaft relative to the movable plate by its own weight so as to follow the bottom of the shaft.
A fourth step of releasing the joining of the movable plate and the liner plate and sliding the movable plate to the lower side of the shield material;
A new liner plate is disposed along the other surface of the shield material, a lower portion of the new liner plate is joined to an upper portion of the movable plate, and an upper portion of the new liner plate is connected to an existing liner plate. A fifth step of joining the lower part;
A liner plate installation method characterized by comprising:   The liner plate installation method according to claim 3, wherein, in the fifth step, the new liner plate is joined to the existing liner plate in a staggered arrangement. In the shaft, a cylindrical wall structure made up of a plurality of steel earth retaining material installation tools is installed,
The installation of the liner plate according to claim 3 or 4, wherein in the third step and the fourth step, each steel earth retaining material installation tool constituting the wall structure is individually lowered. Method. In the shaft, a cylindrical wall structure made up of a plurality of steel earth retaining material installation tools is installed,
5. The liner plate according to claim 3, wherein in the third step and the fourth step, the plurality of steel earth retaining material installation tools constituting the wall structure are lowered integrally. Installation method.

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