JP2020111879A - Pier for drilling - Google Patents

Abstract

To provide a pier for drilling capable of drilling a central deep drilling portion without stopping the construction of a working face, and having high construction efficiency.SOLUTION: A pier 1 for drilling of the present application includes: a jetty main body 10 having a drilling window 16 that can surround the upper portion of a drilling position in the ground, and a base portion 11 that is adjacent to the drilling window 16 in the depth direction; and a slide floor 20 which is disposed on the top of the jetty main body 10 so as to be horizontally slidable. The pier 1 for drilling is characterized in that by covering the upper portion of the drilling window 16 with the slide floor 20, it is possible to configure a vehicle passage that passes through the base portion 11 and the upper portions of the slide floor 20.SELECTED DRAWING: Figure 2

Description

The present invention relates to an excavation jetty, and more particularly to an excavation jetty for deeply excavating the ground at the central portion of the tunnel cross section prior to invert excavation in mountain tunnel construction.

In the mountain tunnel construction, a tunnel invert will be installed in order to suppress the displacement of the ground and secure the cross section required for the tunnel.
In the tunnel invert work, an invert pier that straddles the upper part of the invert work is used to secure the passage of construction vehicles when excavating the ground or placing concrete. Citation 1 discloses a construction method for excavating an invert portion (hereinafter referred to as "invert excavation") by sequentially offsetting the invert jetty to the left and right sidewalls of the tunnel.
By the way, if there is a large amount of spring water on the back of the lining, in order to collect groundwater, the ground at the center of the tunnel cross section is excavated deeper than the invert excavation in a groove shape (this part is called the "central deep excavation part") at the center. Drain pipes may be laid.
At this time, conventionally, (1) a method of excavating the central deep excavation part before the invert pier on the face of the face and backfilling at any time, (2) as in the cited document 1, moving the invert pier to one side and simultaneously performing the invert excavation The method of excavating the central deep dig was adopted.

JP-A-6-173574

The conventional technology has the following problems.
<1> In the method of excavating ahead of the Invert Pier, the vehicle is blocked from passing through the face during excavation, so it is necessary to perform the work on holidays when face construction stops. For this reason, the progress of construction is slow and the construction period is under pressure. In addition, work costs increase due to holiday work.
<2> The method of preceding excavation at the Invert Pier is to bury the drainage pipe from the mine side to the face while backfilling it. Therefore, it is necessary to suspend the drainage pipe from the backfill soil on the mine mouth side of the excavation part. Since the backfill soil has a lot of unevenness and tends to sink, it is difficult to balance heavy equipment and workability is poor.
<3> The method of deep digging at the same time as the invert excavation is difficult to construct because the invert pier is located above the central deep digging area, and heavy equipment may interfere with the invert pier (Fig. 6). Therefore, the construction efficiency is poor and the construction period is pressed.
<4> In any of the methods, the deep machine is deeply dug so that the balance of heavy equipment is easily lost. Especially in the case of the invert advance excavation, the work is performed on the ground that is in poor condition, so the workability is poor and there is a risk of falling.

An object of the present invention is to provide a pier for excavation that can solve the problems of the conventional techniques as described above.

An excavation jetty of the present invention for solving the above-mentioned problems, an excavation window capable of surrounding the excavation position above the ground, and a jetty main body having a base portion adjacent to the excavation window in the depth direction, A slide floor horizontally slidably arranged on the upper part of the pier main body is provided, and by covering the upper part of the excavation window with the slide floor, it is possible to configure a vehicle passage through the base part and the upper part of the slide floor. Is characterized in that
According to this configuration, it is possible to excavate the central deep digging portion while securing the passage for the construction vehicle. In addition, since it is possible to excavate from a stable floor, construction efficiency is high and safety is high.

The excavation jetty of the present invention may have a slide floor slidable in the depth direction from above the excavation window to above the base portion.
According to this structure, the slide floor does not extend to the side of the jetty body, so that the space in the tunnel width direction can be effectively used. Also, since the slide floor can be slid by just pulling it in the tunnel depth direction with a construction vehicle, it is easy to open and close the excavation window.

In the excavation jetty of the present invention, the slide floor may be slidable in the width direction from above the excavation window to the side of the jetty main body.
According to this structure, a detour can be constructed on the side of the jetty main body by the slide floor so that excavation and construction vehicles can pass through at the same time.

The excavation jetty of the present invention may have a plurality of divided floors in which the slide floors are arranged in parallel in the depth direction of the jetty main body.
According to this configuration, the weight per floor is reduced, which facilitates the sliding work, and the plurality of divided floors are sequentially slid from the wellhead side to the face side to be excavated while the excavation jetty is not moved. Long span drilling can be done at one time.

In the excavation jetty of the present invention, the slide floor may be pivotally supported so as to be capable of swiveling and sliding from above the jetty body to the side of the jetty body.
According to this structure, a detour can be constructed on the side of the jetty main body by the slide floor so that excavation and construction vehicles can pass through at the same time.

The pier for excavation of the present invention may have a support member capable of supporting the extension-side end of the slide floor from below in a state where the slide floor is slid to the side of the pier main body.
According to this structure, the construction vehicle can smoothly and safely pass the bypass by securely supporting the slide floor.

The pier for excavation of the present invention may have a slope member that can be passed from the front and the rear of the slide floor to the ground in a state where the slide floor is slid to the side of the pier main body.
According to this configuration, it is possible to facilitate passage of the detour of the construction vehicle.

With the above configuration, the excavation jetty of the present invention has at least one of the following effects.
<1> By opening and closing the excavation window according to the passage of construction vehicles, it is possible to excavate the central deep digging portion without stopping the face construction. Therefore, the construction cycle is good and the construction period can be greatly shortened. In addition, since the holiday work is eliminated, the construction cost can be reduced.
<2> Excavation in deep areas, laying drainage pipes, and backfilling work can be performed from a stable jetty. Therefore, workability is good and construction efficiency is high.
<3> Since the excavation is done prior to the Invert Pier, there is no interference with the Pier and it is easy to excavate the central deep excavation area.
<4> Since the work can be carried out on a stable pier, the construction safety is high.

Explanatory drawing of the jetty for excavation of this invention. Explanatory drawing of the construction method of the pier for excavation of this invention. Explanatory drawing of Example 2. Explanatory drawing of Example 3. Explanatory drawing of Example 4. Explanatory drawing of a prior art.

Hereinafter, the excavation jetty of the present invention will be described in detail with reference to the drawings.
In the present invention, terms such as “depth direction”, “width direction”, “upper and lower”, “left and right”, “sideways”, etc. are arranged with the longitudinal direction of the pier for excavation facing the tunnel extension direction unless otherwise specified. In the state (FIG. 2), it means each azimuth when the face of the face of the tunnel is viewed from the pit side.

[Excavation pier]
<1> Overall configuration (FIG. 1).
The excavation jetty 1 of the present invention is a device for excavating the central deep excavation portion D for the central drain pipe prior to the invert excavation in the mountain tunnel construction.
The pier 1 for excavation includes a pier body 10 and a slide floor 20 which is horizontally slidably arranged on the pier body 10.
In this example, an example in which the slide floor 20 is configured to be slidable in the depth direction of the pier body 10 will be described. Other configurations will be described in detail in the second and subsequent embodiments.
The width of the excavation jetty 1 is narrower than the width of the tunnel and large enough for heavy equipment and construction vehicles to pass through.
In this example, the pier 1 for excavation does not have a self-propelled function, but is moved by being pulled by a heavy machine. However, the invention is not limited to this, and a self-propelled mechanism such as a crawler or a tire may be provided.

<2> Pier body.
The pier body 10 is a structural member of the pier 1 for excavation.
The pier main body 10 includes an excavation window 16 that can surround at least the central deep excavation portion D of the ground, and a flat base portion 13 that is adjacent to the excavation window 16 in the depth direction.
The pier main body 10 of the present example has a vertically long length with the girder 11 as a long side by combining two girders 11 arranged in parallel with each other and a plurality of beam members 12 bridged between the two girders 11. It has a rectangular shape. An excavation window 16 having a rectangular shape in plan view is defined by the two girder members 11 and the two beam members 12.
In this example, a slope 14 for raising and lowering the vehicle is provided in front of and behind the pier body 10. The slope 14 may be detachable and may be detached when the excavation jetty 1 is moved.
In this example, a rail member 15 for sliding the slide floor 20 is installed on the upper portion of the two girder members 11 along the longitudinal direction. The rail material 15 is not an essential component.

<2.1> Base part.
The base portion 13 is a traveling path of the construction vehicle.
The base portion 13 is made of a rectangular face material. In this example, a steel lining plate is used as the base portion 13.
At least one base portion 13 is installed adjacent to the excavation window 16.
In this example, the base portion 13 is installed on the face of the excavation window 16 and the base portion 13 shorter than the base portion 13 on the face of the excavation window 16 is installed on the wellhead side.

<3> Slide floor.
The slide floor 20 is a work table/traveling path that can cover the upper portion of the excavation window 16.
The slide floor 20 is made of a rectangular face material. In this example, a steel lining plate is used as the slide floor 20.
The slide floor 20 is designed to be wider and deeper than the excavation window 16.
In this example, the slide floor 20 has substantially the same size as the base portion 13 on the face of the excavation window 16 and is configured to be slidable along the rail material 15 on the girder material 11 in the depth direction of the pier body 10.
When the slide floor 20 is arranged on the base portion 13, the ground can be excavated from the slide floor 20 through the excavation window 16.
When the slide floor 20 is arranged on the excavation window 16, a traveling path passing through the slope 14 on the face of the face, the base 13 on the face of the face, the slide floor 20, the base 13 on the wellhead side, and the slope 14 on the wellhead side is formed. As a result, the construction vehicle can pass over the excavation part.

<4> Construction method (Fig. 2).
The construction method using the excavation jetty 1 of the present invention is as follows. In addition, a description will be given from a state in which the slide floor 20 is arranged on the excavation window 16, that is, a state in which the excavation window 16 is closed.
The pier 1 for excavation is arranged at the excavation position of the central deep excavation D on the face of the Invert pier. At this time, the excavation window 16 is positioned so as to surround the upper part of the excavation site.
A wire rope or the like is hung on the slide floor 20 from the heavy machine arranged on the face side, and the slide floor 20 is pulled by the heavy machine and slid on the base portion 13 to open the excavation window 16.
The heavy equipment for excavation is moved onto the slide floor 20, and the ground in the excavation window 16 is excavated from above the slide floor 20.
Since the excavation jetty 1 of the present invention can excavate from the stable slide floor 20, it is difficult to lose the balance of heavy equipment even in deep digging, and the workability is good.
When the construction vehicle passes through, the slide floor 20 is once closed, and the slide path 20, the base portion 13, and the traveling path formed on the slide floor 20 are passed.
After completion of the excavation, the heavy equipment is lowered to the face of the excavation jetty 1 and pulled by a wire rope or the like to move the excavation jetty 1 to the next excavation position.

[Example of lateral slide type]
An example of sliding the slide floor 20 to the side of the pier body 10 will be described (Fig. 3).
In the pier 1 for excavation of this example, a rail member 15 is installed on two beam members 12 that define an digging window 16, and a slide floor 20 can slide from the digging window 16 to the side of the pier body 10. It has a different configuration.
For sliding, a method of pushing it out in stages with a hydraulic jack, a method of pulling it with a winch or a chain block fixed to the mine wall, an annular ring provided on the pier body 10 by connecting the slide floor 20 and heavy equipment with a wire rope It is possible to use a method of pulling with a heavy machine while folding the pulling direction of the wire rope 90° at a portion or the like.
A guide portion 17 may be provided on the extension side of the slide floor 20 of the pier body 10. The guide portion 17 bridges a long material above the girder material 11 on the extension side of the slide floor 20 and fixes it between the two base portions 13.
A support member 40 such as shaped steel is arranged in parallel with the girder material 11 of the pier body 10 on the ground to which it slides, and the slide floor 20 is supported by the girder material 11 and the support material 40.
Further, by laying the slope material 30 around the slide floor 20 that has been moved to the side of the pier body 10, it is possible to form a detour for vehicle passage on the side of the pier body 10. The slope 14 of the pier body 10 may be diverted to the slope material 30.
According to the configuration of this example, by constructing a stable detour composed of the slide floor 20 and the slope member 30 on the side of the pier body 10 where excavated soil is piled up and the vehicle cannot run, excavation and construction by heavy equipment It is possible to construct the vehicle and the traffic at the same time.

[Example of horizontal slide division type]
An embodiment in which a plurality of divided floors 20' are slid to the side of the pier body 10 will be described (Fig. 4).
In the pier 1 for excavation of the second embodiment, the slide floor 20 is a combination of divided floors 20 ′ arranged in parallel in the depth direction of the pier body 10.
In this example, the slide floor 20 is composed of two divided floors 20', but the number of sheets is not limited to this.
According to the configuration of this example, by dividing the slide floor 20 and reducing the weight of one of the divided floors 20′, it is possible to reduce the work load related to the sliding of the floor.
Further, it is possible to perform super span excavation at one time by sliding a plurality of divided floors 20′ sequentially from the wellhead side to the face of the face and excavating while moving on the divided floors 20′ with a heavy machine. As a result, it is possible to extend the movement distance of the excavation jetty 1 once, reduce the number of movements, and improve the construction efficiency.

[Example of swivel slide type]
An embodiment in which the slide floor 20 is pivotally slid to the side of the pier body 10 will be described (Fig. 5).
In the pier 1 for excavation of this example, the slide floor 20 is laid over the two base portions 13, and one corner of the slide floor 20 is pivotally supported by a rotary shaft 18 provided at one corner of the base portion 13, and 20 is constructed so as to be horizontally slidable on the side of the pier body 10 in a horizontal direction.
By combining with the support member 40 and the slope member 30 in a state where the slide floor 20 is extended to the side, a detour is constructed on the side of the pier main body 10 in the same manner as in Examples 2 and 3 to perform excavation. It is possible to pass construction vehicles at the same time.

1 Pier for excavation 10 Pier main body 11 Girder material 12 Beam material 13 Base part 14 Diagonal road 15 Rail material 16 Excavation window 17 Guide part 18 Rotating shaft 20 Sliding floor 20' Divided floor 30 Slope material 40 Support material D Central deep excavation part

Claims (7)

A pier for excavation for excavating the ground in the mine during mountain tunnel construction,
A pier main body having an excavation window capable of surrounding above the excavation position of the ground, and a base portion adjacent to the excavation window in the depth direction,
A slide floor horizontally slidably arranged on the pier body,
By covering the upper portion of the excavation window with the slide floor, it is possible to configure a vehicle passage through the base portion and the upper portion of the slide floor.
Pier for excavation. The pier for excavation according to claim 1, wherein the slide floor is configured to be slidable in the depth direction from above the excavation window to above the base portion. The pier for excavation according to claim 1, wherein the slide floor is configured to be slidable in the width direction from above the digging window to the side of the pier main body. The pier for excavation according to claim 2, wherein the slide floor includes a plurality of divided floors arranged in parallel in the depth direction of the pier main body. The pier for excavation according to claim 1, wherein the slide floor is pivotally supported so as to be pivotably slidable from above the pier main body to the side of the pier main body. 6. A support member capable of supporting an extension-side end portion of the slide floor from below in a state where the slide floor is slid to the side of the pier main body, any one of claims 3 to 5. The pier for excavation according to item 1. 7. The slope material having a slope material that can be passed from the front and the back of the slide floor to the ground in a state where the slide floor is slid to the side of the pier main body, according to any one of claims 3 to 6. The listed pier for excavation.

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