JP2597874B2 - Widening culvert and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a process for widening an existing sewer by a shield machine, for example, for a sewer sewer whose processing capacity has reached a limit due to concentration of entrances in an urban area. The present invention relates to an existing sewer widening method and its device.

Conventional technology Conventionally, as a method of widening this type of existing sewer, a retaining wall is installed from the ground around the existing sewer, and after excavating the ground, the existing sewer is removed and replaced with a new one. The open-cutting method for constructing a natural sewer, the propulsion jack set for the starting shaft, the fusing pipe is pushed into the ground while sequentially connecting the fume pipes, and the propulsion method and the shield machine are constructed to build a predetermined underground conduit. There is known a shield construction method and the like in which a digging is performed by using a technique and a segment is assembled in a rear portion thereof.

`` Problems to be Solved by the Invention '' However, in the conventional widening method of various existing sewers, that is, in the excavation method, since the ground must be excavated from the ground to a point where the sewer is installed, In urban areas, buildings and road traffic are obstacles and are almost impossible, and in the propulsion method, the size and number of fume pipes pushed into the ground are limited, and the size of newly installed sewers is limited. However, in the conventional shield method, a new tunnel must be constructed while removing the existing sewer, and the existing sewer becomes an obstacle, and the existing sewer cannot be used during construction. There were problems such as that.

The present invention has been made in view of the above problems,
It is an object of the present invention to provide a widened sewer which can be efficiently constructed to a predetermined size while using and utilizing an existing sewer without causing a traffic obstacle even in an urban area, and a method of constructing the widened sewer. .

"Means for solving the problem" The widened sewer of the present invention is a space formed by crushing approximately the upper half of the existing sewer constructed on the ground and excavating the surrounding ground, A new culvert that is in contact with approximately the lower half of the remaining existing culvert and has a larger cross section than the crushed existing culvert is constructed, and this new culvert and the lower half of the remaining existing culvert are constructed. It is characterized in that it is constructed in a new duct with a large cross section of two steps, upper and lower, where the part contacts. Further, the construction method of the present invention includes a drilling device at the tip, a shield machine having a cross section larger than that of the substantially upper half of the existing sewer so as to cover the substantially upper half of the existing sewer, and installing the existing pipe. While running with the inner surface of the lower half of the culvert as a guide, the excavator crushes the upper half of the existing culvert and excavates the surrounding ground to form a space, and in the space behind the shield machine Assemble the segments one by one to construct a new culvert that contacts the lower half of the existing culvert and has a larger cross section than the crushed existing culvert, and this new culvert and the remaining existing culvert It is characterized by constructing a wide cross-section with a large cross section of two steps up and down by contacting the lower half of the sewer.

[Operation] In the present invention, the crushing of the existing culvert and the excavation of the surrounding ground are performed while the substantially lower half of the existing culvert is left, so that the existing culvert is While using as
A new culvert in contact with approximately the lower half of the existing culvert and having a larger cross section than the crushed existing culvert, and the upper and lower two-stages where the new culvert and the remaining existing culvert are in contact A new sewer can be constructed to widen the existing sewer.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 to FIG. 5 show an embodiment of the widened sewer and the method of construction thereof according to the present invention.

First, an apparatus used when constructing the widened sewer of the present invention will be described. Reference numeral 1 in the figure is disposed in the ground G,
This is an existing sewer used as a sewer, and a shield machine 3 is installed in the middle of the existing sewer 1. In the shield machine 3 of the present embodiment, a traveling device 5 is mounted on the floor of a skin plate 4 having a semicircular cross section having a straight portion as a floor, and a nibble-type excavator 6 is fixed inside. It is a thing. The traveling device 5 includes the skin plate 4
The leg members 5a are fixed to the front and rear portions of the floor plate 4a of the
Wheels (or endless tracks) 5b are provided at the tip of 5a. These wheels 5b are grounded inside the existing sewer 1, and the shield machine 3 can run while guiding the inner surface of the existing sewer 1. The excavator 6 is provided so as to be able to expand and contract in the direction in which the shield machine excavates, and is supported inside the skin plate 4 by a hydraulic cylinder 6a so as to be movable vertically and horizontally.

An inner skin plate 4b is provided at the end of the skin plate 4 and is formed in a double shape, and a movable hood 7 that can be freely inserted and removed in the direction of excavation of the shield machine is mounted inside the inner skin plate 4b. The movable hood 7 is divided into a plurality of parts in the circumferential direction of the skin plate 4.
A roller 8 for supporting the movable hood 7 so as to be movable in the digging direction is provided between the vicinity of both ends and the inner skin plate 4b.

In addition, the front of the bottom plate 4a of the skin plate 4 is inserted into the existing sewer 1 and the existing sewer 1 is inserted from the shield machine side.
Apron 9 to prevent earth and sand from entering inside
Is attached. The moving apron 9 comprises a horizontal plate 9a fixed to the tip of the bottom plate 4a, and a baffle plate 9b formed in a semicircular shape on the upper part so as to close the upper half of the culvert 1. The tip side of the baffle plate 9b is reinforced by a rib 9c. A plurality of shield jacks 10 are provided along the circumferential direction inside the skin plate 4 at the rear of the shield machine 1 as shown in FIG. , 11, ・ ・ ・
The shield machine 1 is propelled by taking a reaction force.

As shown in FIG. 5, a bogie 12 and a battery locomotive 13 are connected to the rear of the shield machine 3. A belt conveyor 16 having a front end located near the inside of the moving apron 9 and a rear end located at a predetermined location of the existing segment 11 is installed inside a pipe 14 newly constructed by the segment 11. The remaining soil conveyed by the belt conveyor 16 is conveyed to the outside by an unloading vehicle 17 moving in a newly constructed conduit 14 by the segment 11.

As shown in FIG. 5, at the boundary between the newly constructed sewer 14 and the existing sewer 1, a sleeper 18 which is also used as a segment made of H steel is provided. A vehicle or the like can move on the upper part. Reference numeral 20 in FIG. 1 denotes a shaft used to carry in the shield machine 1 and discharge remaining soil, 21 denotes a yagura used to construct a retaining wall and carry out remaining soil, glass, and the like, and 22 denotes a yagura used to carry out remaining soil and glass. It is a carrier for the remaining soil.

Next, a construction method for widening the existing culvert 1 using the apparatus configured as described above will be described. This method is
1 shows an example in which the existing sewer widening method of the present invention is used for widening sewerage.

First, after installing temporary facilities such as the yakura 21 for constructing a shaft on the ground and a device for removing residual soil, the shaft 20 reaching the existing sewer which widens to a predetermined place is constructed. As shown in Fig. 1, after the shaft 20 is excavated by performing ground improvement,
A ridge wall 20a is provided on the inner peripheral surface to perform earth retaining, and a pit 20b for storing drainage flowing in the duct 1 is provided at a bottom portion. After the disassembled shield machine is loaded from the shaft 20, the shield machine is assembled in the shaft 20.

Next, after the traveling device 5 of the shield machine is disposed in the existing sewer 1, the upper half of the existing sewer 1 is crushed by the nibble-type excavator 6, and the ground is formed along the shape of the skin plate 4. Excavate G. The face to be excavated covers the face by projecting the movable hood 7 forward, thereby preventing the ground above the face from collapsing and preventing earth and sand from entering the inside of the skin plate 4. The excavated earth and sand is taken into the skin plate 4 by the excavator 6 and then conveyed to the unloading vehicle 17 by the belt conveyor 16, thereby being conveyed to the outside of the sewer 14. Further, the moving apron 9 provided in the existing sewer 1 prevents the sediment taken into the skin plate 4 from entering the inside of the existing sewer 1,
As a result, the shield machine can proceed smoothly using the existing sewer 1 as a guide. Although the traveling device 5 is grounded in the existing sewer 1, the traveling device 5 does not hinder the flow of the sewage flowing through the existing sewer 1, and the sewage can flow as usual.

After the ground in front of the shield machine is excavated in a semicircular shape along the shape of the skin plate 4, the moving hood 7 protruding forward of the skin plate 4 is moved and stored in the skin plate 4. At the same time, the shield 10 is propelled by a predetermined distance (for one ring of the segment) by extending the jack 10 installed at the rear part of the skin plate by applying a reaction force to the existing segment 11. Then, inside the skin plate 4, a segment 11 is formed in a semicircular shape.
To construct a new large-diameter conduit 14 above the existing conduit 1. The existing sewer 1 and the new sewer
A sleeper 18 also serving as a segment is installed at a boundary portion with 14, and an unloading vehicle 17 is driven above the sleeper 18 so that excavated residual soil, waste, and the like are carried out to the outside.

Hereinafter, by repeating the same steps, the segments are assembled at the rear part of the shield machine, and the existing pipe 1 is widened.

As described above, according to the present embodiment, the existing sewer 1 is used as a guide to travel in the existing sewer 1 by the traveling device 5 provided at the bottom of the shield machine, and the existing pipe is excavated by the excavator 6 of the shield machine. After crushing the upper half of the culvert 1 and excavating the ground G into the shape of a skin plate, the jack 1 is extended to propel the shield machine 1 and the segment 11 is assembled behind the existing and assembled. Sewer 1
It is designed to construct a new sewer 14 with a large section in contact with the sea, so there is no need to cut from the ground to the point where the sewer is installed, and road traffic etc. in urban areas will be an obstacle Without the need to remove all of the ready-made sewers.
Therefore, even during construction, the width can be increased while using the existing sewer.

It should be noted that other technical shafts and other embodiments will be described below.

(I) In the above-described embodiment, the cross-sectional shape of the skin plate is formed in a semicircular shape, but is not limited thereto.
It is possible to have an appropriate cross-sectional shape such as a square meter, an ellipse, and a horseshoe.

(Ii) In the above embodiment, the present invention is applied to sewage pipe widening work. However, the present invention can be used for widening work of other electric conduits and the like, or for use of a type different from existing sewers. Of course.

[Effects of the Invention] As described above, according to the widened sewer and the method for constructing the same according to the present invention, it is not necessary to dig from the ground to the point where the sewer is to be installed. The existing sewer can be greatly expanded to any length without causing trouble. Also, it is not necessary to remove all existing sewers.The upper half of the existing sewers and the surrounding ground are excavated. You can proceed.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a side sectional view for explaining the outline of the present invention.
Fig. 2 is a side sectional view of the shield machine during excavation, and Fig. 3 is a cross section of the tip of the shield machine in the right half with respect to the plane of the drawing, and a cross section of the rear part of the shield machine in the left half with respect to the plane of the drawing. Fig. 4 is a cross-sectional view of a state in which a new sewer is added above the existing sewer, and Fig. 5 illustrates a state in which a new sewer is provided above the existing sewer and widened. FIG. G: ground, 1 ... existing sewer, 3 ... shield machine, 4 ...
... Skin plate, 5 ... Traveling device, 6 ... Drilling device,
7: Moving hood, 11: Segment, 14: New sewer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaaki Abe 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Shinichi Nakashield 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Inside (72) Inventor Kenji Watanabe 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation Inside (56) References JP-A-61-221491 (JP, A)

Claims (2)

(57) [Claims] 1. A method for crushing a substantially upper half of an existing sewer constructed on the ground and excavating surrounding ground, and a method for forming a substantially lower half of the remaining existing sewer. A new culvert with a larger cross section than the existing and crushed existing culvert is constructed, and a new two-tiered large cross section, where the new culvert and the remaining lower half of the existing culvert are in contact A widened sewer characterized by being constructed in a simple sewer. 2. A shield machine having a drilling device at the tip and having a cross section larger than that of the substantially upper half of the existing sewer is installed so as to cover substantially the upper half of the existing sewer, and substantially below the existing sewer. While running the inner surface of the half as a guide, the excavator crushes the upper half of the existing sewer and excavates the surrounding ground to form a space, and sequentially assembles segments in the space behind the shield machine A new culvert in contact with approximately the lower half of the existing culvert and having a larger cross section than the crushed existing culvert, and abbreviated to the new culvert and the remaining culvert. A method for constructing a widened culvert, wherein a widened culvert having a large cross section of two upper and lower stages is constructed by contacting the lower half.