JP2021046746A - Box-shaped roof cylinder and box-shaped roof construction method - Google Patents

Abstract

To provide a box-shaped roof cylinder and a box-shaped roof construction method using the same, which enable a part of the box-shaped roof cylinder to be used for a friction cut plate, reduce the member cost, and can simplify an installation work.SOLUTION: In a box-shaped roof cylinder 6 which is a box-shaped cylinder having a substantially square cross section made of a steel pipe, a part of a peripheral surface can be separated as a strip-shaped plate 18 extending in the length direction of the box-shaped cylinder, and a separated strip-shaped plate 17 is used as a friction cut plate.SELECTED DRAWING: Figure 1

Description

The present invention is a box-shaped roof cylinder as a protective work that can be constructed without hindering upper traffic when excavating and constructing a large number of underground structures in the lower ground such as railroads and roads in the transverse direction. It relates to the body and the box-shaped roof construction method using it.

In order to dig a large number of underground structures in the underground of railroads, roads, etc. in the crossing direction, a protective work is required to support the upper traffic, and as such a protective work, conventional pipes, etc. are arranged horizontally in parallel. Although it is possible to install a roof, it is possible to carry out the construction safely, reliably, and inexpensively because the protection work for the underground structure to be dug underground is not carried out as a separate work, but is carried out at the same time as the underground structure is dug. In addition, the following construction methods are known as those that can be constructed with a shallow overburden.

This is also described in the following patent document, but as shown in FIG. 3, first, a retaining steel sheet pile 2 is placed beside the upper traffic 1 of a railway or the like to construct a starting pit 3 and an arriving pit 4. A press-fitting machine 5 is installed in the starting pit 3, and the box-shaped roof cylinder 6 is press-fitted toward the reaching pit 4.
Japanese Unexamined Patent Publication No. 9-287389

As shown in FIG. 5, the box-shaped roof cylinder 6 is a box-shaped cylinder having a substantially square cross section made of steel pipes, and is arranged inward with a male joint 6a in which hook-shaped constituent members are arranged outward on the side surface. A female joint 6b is continuously formed in the longitudinal direction, and a friction cut plate 7 made of a flat plate is attached to the upper surface thereof.

The box-shaped roof cylinder 6 is for press-fitting unit cylinders one by one. A joint flange 6c for bolt joining is formed at an end, and the joint flanges 6c are fastened to each other with bolts and nuts 19. The required length is buried by adding one piece at a time in the length direction, and the pieces are further arranged in parallel while being continuous in the lateral direction via the joints 6a and 6b.

The bolts and nuts 19 are fastened at this portion by setting the corner of the end of the box-shaped roof cylinder 6 as a box punch 6d that is open outward.

The arrangement of the box-shaped roof cylinders 6 is appropriately selected according to the underground structure 9 arranged in a single character type, a gate type, a box type, or the like.

Next, as shown in FIG. 3, an underground structure made of a reaction force wall 8 and a concrete box 9 is set in the starting pit 3, and a push propulsion jack 10 is placed between the reaction wall 8 and the concrete box 9. Is provided, a cutting edge 11 is provided at the tip of the concrete box 9, and a small jack 12 is interposed between the tip of the concrete box 9 and the roof cylinder 6.

In the figure, 13 is a support member for the box-shaped roof cylinder 6, and 14 is a stop member for the friction cut plate 7, which is provided on the starting pit 3 side, while the pedestal 15 is provided on the reaching pit 4 side.

If the small jack 12 is extended and the concrete box 9 is used as a reaction force to push the box-shaped roof cylinders 6 one by one while leaving the friction cut plate 7, and the box-shaped roof cylinders 6 move forward. , The small jack 12 is shrunk, and this time the propulsion jack 10 is extended to dig up the concrete box 9. In the figure, 16 is a strut interposed between the propulsion jack 10 and the concrete box 9.

In this way, the box-shaped roof cylinder 6 protruding from the reaching pit 4 is sequentially removed while alternately repeating the advance of the box-shaped roof cylinder 6 and the advance of the concrete box 9.

Then, when the tip of the concrete box 9 reaches the reaching pit 4, the cutting edge 11 and the like are removed and backfill grout is performed as appropriate to complete the construction.

The friction cut plate 7 is a strip-shaped plate made of a steel plate, and is placed on a box-shaped roof cylinder 6 and press-fitted into the ground together.

The friction cut plate 7 and the box-shaped roof cylinder 6 were manufactured as separate members, and the member cost was high accordingly.

An object of the present invention is to eliminate the inconvenience of the conventional example, enable a part of the box-shaped roof cylinder to be used for the friction cut plate, reduce the member cost, and simplify the installation work. The purpose is to provide a tubular body for a shaped roof and a box-shaped roof construction method.

In order to achieve the above object, in the present invention, as the box-shaped roof cylinder, in the box-shaped roof cylinder which is a box-shaped cylinder having a substantially square cross section made of steel pipe, a part of the peripheral surface is the length of the box-shaped cylinder. The gist is to make it separable as a strip-shaped plate extending in the longitudinal direction, to use the separated strip-shaped plate as a friction cut plate, and to bolt or screw the strip-shaped plate to the main body with the backing plate interposed therebetween. It is a thing.

As a protective work when propelling a concrete box to be installed as an underground structure, a box-shaped roof, which is a box-shaped cylinder with a substantially square cross section made of steel pipes, is arranged so as to match the outer edge of the concrete box to be installed. However, this box-shaped roof is pushed in advance between the starting shaft and the reaching shaft, which is the total length of the cross-section, and a concrete box is installed behind it to push out the box-shaped roof and propel the concrete box. In the box-shaped roof construction method in which the shaped roof and the concrete box are replaced and installed, the box-shaped roof cylinder has a box shape in which a part of the peripheral surface can be separated as a strip-shaped plate extending in the length direction of the box-shaped cylinder. When extruding the roof, the strip-shaped plate is left as a friction cut plate with the ground when propelling the concrete box, and the concrete box slides the side surface opposite to the ground contact surface of the friction cut plate. Is the gist.

According to the present invention, in the box-shaped roof cylinder, a part of the peripheral surface can be separated as a strip-shaped plate extending in the length direction of the box-shaped cylinder, and the separated strip-shaped plate is used as a friction cut plate. , The friction cut plate and the box-shaped roof cylinder are not separate members, and the member cost can be reduced accordingly.

Further, when the box-shaped roof cylinder is press-fitted into the ground, the friction cut plate can be press-fitted as forming the box-shaped roof cylinder, and then when the box-shaped roof is extruded, the friction cut plate can be press-fitted. Can be separated and left to obtain a friction cut with the ground when propelling the concrete box.

According to the second aspect of the present invention, the strip-shaped plate body to be the friction cut plate is bolted or screwed to the main body with the backing plate interposed therebetween, so that the original integrated side type is used after separation and use. , It can be done easily without troublesome work such as welding.

As described above, the box-shaped roof cylinder and the box-shaped roof construction method of the present invention make it possible to use a part of the box-shaped roof cylinder for the friction cut plate, reduce the member cost, and install the friction cut plate. It is possible to simplify the trouble of.

It is a front view which shows 1 Embodiment of the box-shaped roof cylinder of this invention. It is a front view which shows the detail of the part a of FIG. It is a side view which shows the first half process of the construction method of the underground structure by the box-shaped roof construction method. It is a side view which shows the latter half process of the construction method of the underground structure by the box-shaped roof construction method. It is a perspective view of the cylinder for a box-shaped roof. It is a front view of the cylinder for a box-shaped roof.

Hereinafter, embodiments of the present invention will be described in detail with respect to the drawings. FIG. 1 is a front view showing one embodiment of the box-shaped roof cylinder of the present invention, FIG. 2 is a vertical sectional side view of the same part as above, FIG. 6 is a box-shaped roof cylinder, and the basic configuration is a substantially square cross section made of a steel pipe. It is a cylinder of.

Although not shown, the joint flange 6c is a plate body having bolt insertion holes as shown in FIGS. 5 and 6, and bolts can be fastened by overlapping them with each other.

The box-shaped roof cylinder 6 has a cross-sectional shape of 1,000 x 1,000 (mm) and a length of 3,000 (mm), or a cross-sectional shape of 800 x 800 (mm) and a length of 6,000 (mm) and has a side hook shape. The male joint 6a and the female joint 6b (see FIG. 6), which are constituent members, may or may not be present.

Further, the box-shaped roof cylinder 6 has a box-extracted 6d whose end corners are open outward, and this is used as a fastening portion for bolts and nuts.

In the present invention, the box-shaped roof cylinder 6 can be separated into a main body 17 and a strip-shaped plate 18 extending in the length direction of the box-shaped cylinder.

When forming the strip-shaped plate 18, one side of the four-sided wall of the box-shaped cylinder having a substantially square cross section made of the steel pipe forming the box-shaped roof cylinder 6, or two sides including the corners in the length direction. It should be cut out in a strip shape.

The separable main body 17 and the strip-shaped plate 18 are fixed with bolts 21 or screws with the backing plate 20 interposed therebetween.

Next, the box-shaped roof construction method performed by using the box-shaped roof cylinder 6 will be described, but it is basically the same as the conventional example shown in FIGS. As shown, first, a retaining steel sheet pile 2 is placed beside the upper traffic 1 of a railway or the like to construct a starting pit 3 and a reaching pit 4, and a press-fitting machine 5 is installed in the starting pit 3. The box-shaped roof cylinder 6 is press-fitted toward the reaching pit 4, and at that time, the strip-shaped plate 18 serving as the friction cut plate 7 is incorporated as a part of the box-shaped roof cylinder 6.

The box-shaped roof cylinder 6 is for press-fitting unit cylinders one by one. A joint flange 6c for bolt joining is formed at an end, and the joint flanges 6c are fastened to each other with bolts and nuts 19. The required length is buried by adding one piece at a time in the length direction, and the pieces are further arranged in parallel while being continuous in the lateral direction via the joints 6a and 6b.

The bolts and nuts 19 are fastened at this portion by setting the corner of the end of the box-shaped roof cylinder 6 as a box punch 6d that is open outward.

When forming the strip-shaped plate body 18, the joint flange 6c and the box punch 6d at the end thereof may be left on the main body 17 side.

The arrangement of the box-shaped roof cylinders 6 is appropriately selected according to the concrete box 9 as an underground structure arranged in a single character type, a gate type, a box type, or the like.

The main body 17 of the box-shaped roof cylinder 6 is separated from the main body 17 while the strip-shaped plate 18 is separated from the main body 17 and the small jack 12 is extended to leave the strip-shaped plate 18 as the friction cut plate 7 with the concrete box 9 as a reaction force. Push forward one by one, and when the box-shaped roof cylinder 6 moves forward, the small jack 12 is contracted, and this time the propulsion jack 10 is extended to dig up the concrete box 9.

In this way, the main body 17 of the box-shaped roof cylinder 6 protruding from the reaching pit 4 is sequentially removed while alternately repeating the advance of the box-shaped roof cylinder 6 and the advance of the concrete box 9.

Then, when the tip of the concrete box 9 reaches the reaching pit 4, the cutting edge 11 and the like are removed and backfill grout is performed as appropriate to complete the construction.

The end of the strip-shaped plate body 18 used as the friction cut plate 7 is fixed by a stopper provided on the starting pit 3 side, and the concrete box 9 slides on the side surface opposite to the ground contact surface of the friction cut plate 7. The strips 18 are moved, but the ends of the strips 18 are welded at the same time, or a joint plate is interposed so that the strips 18 are continuous so as not to move.

Further, the strip-shaped plate 18 used as the friction cut plate 7 will be buried or pulled out when the underground structure made of the concrete box 9 is completed, but in the former case, a new strip-shaped plate 18 will be used. It is also possible to produce a box-shaped roof cylinder 6 by fitting it into the collected main body 17.

Regarding the method of advancing the concrete box 9, a reaction force wall and a center hole type tow jack are provided on the reaching pit 4 side, and a tow member made of a PC steel wire having one end fixed to the concrete box 9 is pulled by this tow jack. As a result, the concrete box 9 can be pulled in from the arrival pit 4 side.

Further, as another construction method using the box-shaped roof cylinder 6, when the concrete box is propelled after the box-shaped roof is press-fitted, the earth and sand of the face portion is pushed out together with the box-shaped roof together with the propulsion of the box, SFT. It can also be used in the construction method "(Simple and Face-Less Method of Construction of Tunnel)" Abbreviation for "Simple and Face-Less Method of Construction of Tunnel".

1 ... Upper traffic 2 ... Retaining steel sheet pile 3 ... Starting pit 4 ... Reaching pit 5 ... Press-fitting machine 6 ... Box-shaped roof cylinders 6a, 6b ... Joint 6c ... Joint flange 6d ... Boxing 7 ... Friction cut plate 8 ... Reaction wall 9 ... Concrete box 10 ... Propulsion jack 11 ... Blade edge 12 ... Small jack 13 ... Support material 14 ... Stopping member 15 ... Cradle 16 ... Strut 17 ... Main body 18 ... Strip plate 19 ... Bolts, nuts 20 ... Backing plate 21 ... Bolt

Claims (3)

In a box-shaped roof cylinder that is a box-shaped cylinder with a substantially square cross section made of steel pipes, a part of the peripheral surface can be separated as a strip-shaped plate extending in the length direction of the box-shaped cylinder, and the separated strip-shaped plate can be separated. A box-shaped roof cylinder characterized by being a friction cut plate. The box-shaped roof cylinder according to claim 1, wherein the strip-shaped plate is bolted or screwed to the main body with the backing plate interposed therebetween. As a protective work when propelling a concrete box to be installed as an underground structure, a box-shaped roof, which is a box-shaped cylinder with a substantially square cross section made of steel pipes, is arranged so as to match the outer edge of the concrete box to be installed. However, this box-shaped roof is pushed in advance between the starting shaft and the reaching shaft, which is the total length of the cross-section, and a concrete box is installed behind it to push out the box-shaped roof and propel the concrete box to propel the box. In the box-shaped roof construction method in which the shaped roof and the concrete box are replaced and installed,
The box-shaped roof cylinder can be separated from a part of the peripheral surface as a strip-shaped plate extending in the length direction of the box-shaped cylinder, and when the box-shaped roof is extruded, the strip-shaped plate promotes this as a concrete box. A box-shaped roof construction method that is left as a friction cut plate with the ground at the time of the above, and the concrete box is slid on the side opposite to the ground contact surface of the friction cut plate.

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