JPH07259078A - Steel material for shield opening, constructing method for underground continuous wall, and boring method for pit - Google Patents

Abstract

PURPOSE:To offer a method of constructing an underground continuous wall and establish a boring method for a pit for shield tunnel construction to be made at the underground continuous wall, with which it is possible to reduce the human labor otherwise required for boring according to the conventional method, omit the ground improving works, and shorten the construction period. CONSTITUTION:A steel material 1 for shield opening having an open space is buried in an underground continuous wall 81, and the body part of this wall is excavated directly by a shield machine 4 so that boring is made. A ringshaped steel material 88 and elastic material 6 provided with a hole in the same shape as a skin plate 45 of the shield machine 4 are installed on a pit body wall 87 around the boring part. A water stop steel material 61 is welded to the ringshaped steel material 88 and the periphery of each of segments 91 arranged in the pit in the form of a shield tunnel before the rear part of the shield machine 4 will have passed the elastic material 6, and thereby water stopping is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground continuous wall used for a shaft for excavating a shield tunnel.

[0002]

2. Description of the Related Art Conventionally, a shield construction method has been used as one of methods for constructing a tunnel for an underground oil and gas pipeline, an underground power cable, a subway, an underpass or the like. When constructing a shield tunnel in a relatively deep underground by the shield method, construct a vertical shaft vertically to the ground to the shield tunnel construction depth and excavate the shield tunnel from the bottom side wall of the vertical shaft. .

An underground continuous wall method is one of the methods for constructing a shaft. The underground continuous wall method is a method of constructing a wall body made of steel and concrete in the excavation trench excavated in the ground. In order to prevent collapse of the excavation trench during ground excavation, the continuous underground wall is constructed by dividing it into underground walls of unit length (hereinafter referred to as "elements"). Adjacent to the previously constructed element (hereinafter referred to as the "preceding element"),
The underground continuous wall is constructed by successively constructing subsequent elements (hereinafter referred to as “subsequent elements”).
An example of the conventional underground continuous wall construction method is shown below.

(1) An excavation groove having a predetermined length, width and depth is excavated in the ground. In order to prevent collapse of the wall of the trench and inflow of groundwater into the trench, excavation is performed while supplying a stable liquid into the trench. (2) The slime in the excavation trench and the excavated soil remaining in the stabilizing solution are removed. If necessary, the stabilizing solution in the trench will be replaced. (3) Interlocking material is set up at the end of the excavation trench. An interlocking material is provided for drilling a trench for the trailing element adjacent to the leading element. That is, when excavating the excavation groove for the succeeding element adjacent to the preceding element, the excavation work is hindered if the blade of the excavator hits the preceding element. In order to prevent this, a space is secured at the end of the excavation groove with an interlocking material. Therefore, the interlocking material is removed in a later step.

(4) A steel material is set up in the excavation trench. (5) An underwater concrete is placed in the excavation groove to replace the stabilizing solution in the excavation groove with the underwater concrete. (6) The interlocking material is removed after the underwater concrete reaches a predetermined hardness, and the underground wall for one element is constructed. (7) An excavation groove for constructing a subsequent element is excavated adjacent to the preceding element. A continuous underground wall is constructed by successively constructing subsequent elements in the same procedure.

After constructing an underground continuous wall so as to surround the ground of a predetermined area, the ground surrounded by the underground continuous wall is excavated, and the bottom is constructed at the bottom of the excavated ground to complete the shaft. Or
While excavating the ground surrounded by the continuous underground wall at a constant depth, the inner wall of the underground continuous wall is lined with the shaft body wall by the reverse winding method. After lining the shaft body wall to a predetermined depth, a bottom plate is constructed at the bottom of the excavated ground to complete the shaft.

FIG. 19 is a schematic view showing a conventional shaft and shield tunnel. In FIG. 19, 80 is a vertical shaft, 81 is an underground continuous wall, 82 is a rooting part, 83 is a bottom plate, 84 is a mirror opening part of the underground continuous wall 81, 9 is a shield tunnel, 5 is ground,
Reference numeral 52 indicates the ground (ground improvement portion) near the mirror opening portion 84, and 53 indicates a river.

The shaft 80 constructed by the underground continuous wall 81 is a hole for excavating a shield tunnel in the wall body (hereinafter referred to as "mirror opening portion". Further, providing a mirror opening portion will be described below.
It is necessary to provide 84 called “to open the mirror”. Conventionally, the mirror opening portion 84 of the underground continuous wall 81 is provided by removing the concrete of the wall body and melting and removing the steel material inside the wall body. Further, when the mirror opening portion 84 is provided on the wall body, it is necessary to prevent earth and sand and groundwater from flowing into the shaft 80 from the mirror opening portion 84. Therefore, conventionally, a pipe from the ground surface to the depth of the mirror opening portion is provided on the ground on the opposite side partitioned by the underground continuous wall 81, and liquid nitrogen or a refrigerant is supplied from the pipe to freeze the ground 52 near the mirror opening portion 84. The ground is improved by freezing (freezing method) or injecting cement milk or the like from the pipe to solidify the ground 52 near the mirror opening portion 84 (column jet method).

[0009]

[Problems to be Solved] The following problems may be considered in the conventional mirror opening of the vertical shaft. (1) Most of the work of removing the steel material and the concrete of the mirror opening part is manual work, and requires a lot of labor.
In particular, the work of removing the concrete is not preferable in terms of safety and hygiene because dust is generated. (2) The ground improvement work is performed at the depth of the mirror opening, that is, the sea.
There is a problem that the deeper the location of the tunnel, the more difficult the technology becomes and the higher the cost becomes. There is a problem that it is difficult to confirm whether the ground improvement has been carried out reliably. (3) It takes time to remove steel and concrete by human power and ground improvement work.

In order to solve these problems, Japanese Unexamined Patent Publication No.
In Japanese Patent Publication No. 18181, a granular material such as earth and sand is packed in a frame material having an inner diameter substantially the same as the diameter of the mirror opening portion, and a frame plate made of concrete is arranged above and below the frame material and a lid is provided. , A method of arranging at the mirror opening is disclosed. In the method disclosed in JP-A-5-18181, it is necessary to freeze the earth and sand in the frame material in order to obtain the strength of the mirror opening of the constructed underground continuous wall. For this reason, when constructing an underground continuous wall, there is a problem in that it takes time and effort during on-site construction, such as freezing the earth and sand in the frame material.

The present invention has been conceived in order to solve the above problems, and it is possible to reduce the work required to open the mirror and shorten the construction period. It is the method of construction and the method of opening the shaft mirror.

[0012]

According to a first aspect of the present invention, there is provided a pair of plate-like flanges arranged in parallel and a plurality of plate-like webs vertically attached to the flanges. A steel material for a shield opening, which has an opening space portion penetrating from one to the other.

The invention according to claim 2 further comprises a cylindrical space portion surrounded by a flange surface and a web connecting the flange surfaces to the left and right of the opening space portion. Partial steel.

According to a third aspect of the present invention, there is further provided a seal joint at at least one of an upper end portion and a lower end portion of the tubular opening portion. is there.

The invention according to claim 4 has (1) a pair of plate-like flanges arranged in parallel and a plurality of plate-like webs vertically attached to the flanges, and surrounded by the flanges and the webs. A steel material for constructing an underground continuous wall having a tubular space, (2) a pair of plate-like flanges arranged in parallel and a plurality of plate-like webs vertically attached to the flange, Having an opening space portion penetrating from one to the other, and having a cylindrical space portion surrounded by a web connecting the flange surfaces and the flange surfaces to each other on the left and right of the opening space portion, the underground continuous wall building steel material and the flange A steel material for a shield opening having the same surface spacing and the same mounting position of the web, which is connected to a single piece or a plurality of pieces in the vertical direction, respectively, and is arranged at the bottom of the steel material for constructing an underground continuous wall or the shield opening. Seals the bottom of the cylindrical space of the use steel, a method for constructing a diaphragm wall having be crowded stable solution satisfying the excavation groove step.

According to a fifth aspect of the present invention, there is provided a pair of plate-shaped flanges arranged in parallel and a plurality of plate-shaped webs vertically attached to the flanges, and the plate-shaped web penetrates from one of the flanges to the other. Directly excavating a vertical shaft, in which at least a part of the wall body is constructed by a shield machine, by a continuous underground wall consisting of a steel structure partially containing a steel material for a shield opening having an opening space and concrete In the method of opening a mirror in a vertical shaft, the wall body portion of the underground continuous wall in which the opening space portion of the steel material for shield opening is located is used as a mirror opening portion.
Installing an elastic body having a hole having substantially the same outer shape as the skin plate of the rudder machine on the wall of the underground continuous wall or the wall of the shaft, according to the position of the mirror opening, (2)
The skin plate of the shield machine is inserted into the hole of the elastic body and the mirror opening of the underground continuous wall in front of the shield machine is shielded while the segments are arranged in the shield tunnel behind the shield machine. (3) Before the rear part of the skin plate of the shield machine reaches the hole of the elastic body and finishes passing, the outer periphery of the segment arranged in a shield tunnel inside the shaft and underground A method of opening a shaft of a vertical shaft, comprising a step of sealing a continuous wall wall body or a vertical shaft main body wall from the inside of the vertical shaft.

According to a sixth aspect of the present invention, there is provided a pair of plate-like flanges arranged in parallel and a plurality of plate-like webs vertically attached to the flange, and the plate-like web penetrates from one of the flanges to the other. A vertical shaft that at least partially constitutes a wall body is excavated directly by a shield machine by an underground continuous wall consisting of a steel structure partially containing a steel material for a shield opening having an opening space and concrete. In the method of opening a mirror in a vertical shaft, the wall body portion of the underground continuous wall in which the opening space portion of the steel material for shield opening is located is used as a mirror opening portion.
Installing an elastic body having a hole having substantially the same outer shape as the skin plate of the rudder machine on the wall of the underground continuous wall or the wall of the shaft, according to the position of the mirror opening, (2)
With a shield machine that has reached the outer surface of the underground continuous wall from the outside of the shaft, the step of excavating the mirror opening portion, (3) the rear part of the skin plate of the shield machine penetrates the wall portion of the underground continuous wall,
Before passing through the hole of the elastic body, the filler is supplied from the inside of the shield tunnel into the gap between the outer periphery of the segment arranged in a shield tunnel and the wall of the underground continuous wall or the wall of the shaft. The method of opening a vertical shaft is as follows.

[0018]

The steel material for a shield opening according to claim 1 has a pair of plate-like flanges arranged in parallel, and has an opening space portion penetrating from one of the flanges to the other. For this reason, in the underground continuous wall constructed using the steel material for shield opening according to claim 1, the wall body portion corresponding to the opening space portion is composed only of concrete.

The steel material for a shield opening according to claim 2 has a cylindrical space portion surrounded by a flange surface and a web connecting the flange surfaces on the left and right outside of the opening space portion. When the underground continuous wall building steel material and the steel material for the shield opening of claim 2 are connected to each other in the step of standing up in the excavation trench during construction of the underground continuous wall, the steel material is prevented from flowing into the tubular space. By connecting the two to each other, the steel material for shield opening according to claim 2 receives the buoyancy corresponding to the volume of the cylindrical space. That is, the tubular space portion acts to increase the buoyancy force received by the steel material for shield opening of claim 2.

In the steel material for shield opening according to the third aspect of the present invention, the seal joint portion is formed on at least one of the upper end and the lower end of the tubular space. Therefore, when connecting the steel material for constructing an underground continuous wall or another steel material for a shield opening to the upper and lower sides of the steel material for a shield opening of claim 3, it becomes easy to position the steel material.

The method for constructing an underground continuous wall according to claim 4 is
(1) An underground continuous wall having a pair of plate-like flanges arranged in parallel and a plurality of plate-like webs vertically attached to the flanges, and having a tubular space surrounded by the flanges and the webs Steel material for construction, (2) A pair of plate-like flanges arranged in parallel, and a plurality of plate-like webs vertically attached to the flange, and an opening space portion penetrating from one of the flanges to the other And a cylindrical space portion surrounded by a web connecting the flange surfaces to each other on the left and right of the opening space portion, and the steel material for constructing the underground continuous wall and the flange surface spacing and the installation position of the web are equal. -Connect the steel material for the opening of the container in the vertical direction. In the method for constructing an underground continuous wall according to claim 4, a part of the wall body of the underground continuous wall is
It consists of a steel structure and a concrete structure constructed by vertically connecting the steel material for constructing the underground continuous wall and the steel material for the shield opening. By connecting the steel material for constructing the underground opening to the steel material for forming the shield opening, the height of the steel material for the shield opening can be determined at a predetermined position. Steel and steel for construction of continuous underground wall
By making the flange surface spacing of the steel for opening openings and the mounting position of the web equal, the tubular space of the steel for building underground continuous wall and the tubular space of steel for opening are continuously connected. It becomes possible to do.

In connecting the steel material for constructing an underground continuous wall and the steel material for a shield opening in the vertical direction, (1) a steel material for constructing an underground continuous wall and a sheath which are designed to have the same flange face spacing and web attachment position. By using the steel material for the opening of the cylinder and (2) sealing the bottom of the cylindrical space of the steel material for constructing the underground continuous wall or the steel for the shield opening, which is arranged at the bottom, the cylindrical space is In the left and right of the opening space portion of the steel material for shield opening, they are connected in a box shape in the vertical direction. Therefore, in the process of suspending the steel material for constructing the underground continuous wall and the steel material for the shield opening in the excavation ditch filled with the stable liquid, the volume of the cylindrical space below the stable liquid level is reduced. It becomes possible to obtain buoyancy. Further, by preventing the stable liquid from flowing into the tubular space portion, it is possible to place concrete other than the underwater concrete in the tubular space portion. In addition, water leakage prevention measures are appropriately applied to the connecting portions between the cylindrical space portions.

According to the invention of claim 5, at least a part of the wall of the vertical shaft that opens the mirror has an opening space portion that penetrates from one of the pair of parallel plate-shaped flanges to the other. It consists of an underground continuous wall consisting of concrete and a steel structure partially containing the steel material for openings. The wall part of the underground continuous wall where the opening space of the steel for the shield opening is located will be the mirror opening. The mirror opening is made of concrete only and no steel material is embedded. Therefore, the mirror opening can be directly excavated by the shield machine.

In the invention of claim 5, an elastic body having a hole having substantially the same outer shape as that of the skin plate of the shield machine is installed on the underground continuous wall wall or the shaft main body wall in accordance with the position of the mirror opening. There is a step to do. By installing the elastic body on the underground continuous wall wall or the shaft main body wall, the waterproofness between the elastic body and the underground continuous wall wall or the shaft main body wall is secured. The elastic body has a hole portion having substantially the same outer shape as the skin plate of the shield machine used for excavation. Therefore, when the skin plate of the shield machine is inserted into the hole of the elastic body, the waterproofness between the elastic body and the shield machine is secured. In the invention of claim 5, since the skin plate shield of the shield machine is inserted into the hole of the elastic body before the excavation is started, the hole of the elastic body is shielded.
It will be installed on the wall of the continuous underground wall or the wall of the vertical shaft according to the position of the opening space of the steel material for the opening.

According to the invention of claim 5, the skin plate of the shield machine is inserted into the hole of the elastic body, and the segments are arranged behind the shield machine in the form of shield tunnels. There is a step of excavating a mirror opening portion of the front underground continuous wall. By inserting the skin plate of the shield machine into the hole of the elastic body,
The waterproofness between the shield machine and the elastic body is secured. On the other hand, in order to secure the waterproof property between the elastic body and the wall of the underground continuous wall or the wall of the shaft when installing the elastic body, while the skin plate of the shield machine is inserted into the hole of the elastic body. In the vertical shaft, waterproofing is secured.

In the invention of claim 5, before the rear portion of the skin plate of the shield machine reaches and passes through the hole of the elastic body, the outer periphery of the segment arranged in a shield tunnel inside the shaft. And a step of sealing between the underground continuous wall wall or the shaft wall from the inside of the shaft. Before the rear part of the skin plate finishes passing through the hole of the elastic body, by sealing the outer periphery of the segment arranged in a shield tunnel inside the shaft and the underground continuous wall wall body or the shaft body wall, The waterproofness inside is secured.

The invention of claim 6 is a method for opening a mirror of a vertical shaft by a shield machine which has been dug from the outside of the vertical shaft. In the invention of claim 6, the rear part of the skin plate of the shield machine penetrates the wall part of the underground continuous wall,
And before the end of passing through the hole of the elastic body installed in the underground continuous wall wall or the shaft wall, the gap between the outer periphery of the segment arranged in a shield tunnel and the underground continuous wall wall or the shaft wall Then, a filler is supplied from inside the shield tunnel to seal it. Therefore, when the shield machine penetrates the mirror opening of the underground continuous wall, the water stop inside the shaft is secured.

[0028]

1 is a schematic perspective view showing an embodiment of a steel material for shield opening according to the invention of claim 3. In FIG. 1 in FIG.
1 is a flange, 12 is a web, 13 is an open space, 14
Indicates a cylindrical space portion, 15 indicates an inro joint portion, 16 indicates a small hole for bolt connection, and 17 indicates a joint portion. Further, a direction perpendicular to the normal direction of the flange 11 surface and perpendicular to the normal direction of the web 12 surface is hereinafter referred to as "material axis direction".

The steel material for a shield opening shown in FIG. 1 has a pair of plate-like flanges 11. The flanges 11 are arranged parallel to each other with a plate-shaped web 12 vertically attached to the surface of the flanges 11. An opening space portion 13 is provided at the center of the flange 11 so as to penetrate from one side of the flange 11 to the other side. In the underground continuous wall constructed using the steel material for the opening of the shield, the wall portion corresponding to the opening space portion 13 is composed only of concrete. Therefore, the wall body portion of the underground continuous wall where the opening space portion 13 is located is directly shielded.
It becomes possible to dig with a rudder machine.

The cylindrical space portion 14 is formed by being surrounded by a pair of flanges 11 and a pair of webs 12. Open space 1
It is preferable that the cylindrical space portions 14 located on the left and right sides of 3 have the same volume on the left and right sides. That is, the steel material is increased in size by providing the opening space portion 13 in the steel material for the shield opening. For this reason, when constructing an underground continuous wall using the steel material for shield opening, the steel material for shield opening and the steel material for constructing underground continuous wall are suspended in the excavation groove while connecting in the axial direction of the material. There is a problem that the supporting load of the steel material increases in the process of rolling. When the tubular space portion 14 is provided with a stabilizing liquid inflow prevention means, it is possible to obtain buoyancy corresponding to the volume of the tubular space portion 14 below the stable liquid surface level. Considering the balance of the buoyancy acting on the steel material at this time, it is preferable that the volume of the tubular space portion 14 is the same on the left and right sides of the opening space portion 13.

At the upper portion of the tubular space portion 14 located on the left and right of the opening space portion 13, along the inner surfaces of the upper portion of the flange 11 and the web 12 forming the tubular space portion 14, a square tubular inro joint (male joint portion). ) 15 is provided. On the other hand, the steel material for the shield opening and the steel material for constructing the underground continuous wall to be connected are designed to have the same flange spacing and web mounting position. By designing in this way, the cage joint portion 15 of the steel material for shield opening can be inserted into the lower end portion of the tubular space portion of the steel material for constructing the underground continuous wall to be connected. Therefore, see
When connecting the steel materials for constructing the underground continuous wall in the axial direction of the steel material for the opening, it is easy to align the steel materials.

The upper and lower parts of the flange 11 have seams.
A small hole 16 for joining bolts for connecting another steel material is provided in the axial direction of the steel material for opening the field. The bolt-jointing small holes 16 are not provided in a predetermined cylindrical space portion 14 which requires water blocking when connecting the steel material for constructing an underground continuous wall and the steel material for a shield opening in the material axial direction. . The steel materials are connected by bolts through a splicing plate. Further, the steel materials may be connected by welding, and in this case, the bolt joining small hole 16 is not necessary.

A joint portion 17 is continuously provided at the tip of the flange 11 along the axial direction of the material. The joint portion 17 is provided for horizontally connecting steel materials. In the invention of claim 1, the cylindrical space portion 14 is unnecessary. Also,
In the invention of claim 2, the inro joint portion 15 is unnecessary.

Next, an embodiment of a method for constructing an underground continuous wall according to the invention of claim 4 will be described using the steel material for shield opening shown in FIG. FIG. 2 is a schematic perspective view showing an embodiment of a steel material for constructing an underground continuous wall, which is one of the steel materials used in the method for constructing an underground continuous wall of claim 4. In FIG. 2, 11 is a flange, 12 is a web, 17 is a joint portion, 14 is a cylindrical space portion,
Reference numeral 16 indicates a small hole for bolt connection.

The steel material for constructing an underground continuous wall shown in FIG. 2 has a pair of plate-shaped flanges 11. The flanges 11 are arranged in parallel via a plate-shaped web 12 that is vertically attached to the surface of the flange 11. A cylindrical space portion 14 is formed by being surrounded by a pair of plate-like flanges 11 and a pair of webs 12. Space between 11 flanges of steel material for underground continuous wall construction,
The mounting position of the web 12 is a seam connecting in the axial direction.
Designed to the same dimensions as the steel material for the opening. By designing in this way, it becomes possible to continuously connect the tubular spaces 14 of the steel material for constructing the underground continuous wall and the steel material for the shield opening.

At the upper part of the tubular space portion 14 located at the left and right ends of the steel material for constructing the underground continuous wall, a rectangular tubular indentation is formed along the inner surfaces of the flange 11 and the web 12 forming the tubular space portion 14. A joint (male joint portion) may be provided. Since the steel material for constructing the underground continuous wall and the steel material for shield opening are designed to have the same dimensions for the flange 11 surface spacing and the mounting position of the web 12, the inro joint (male joint portion) is inserted in the bottom of the cylindrical space portion 14. It will be possible. Therefore, when connecting the steel material for constructing the underground continuous wall and the steel material for the shield opening in the material axis direction, there is an effect that the alignment becomes easy. When the steel material for constructing an underground continuous wall and the steel material for shield opening are connected in the axial direction, the steel material for constructing an underground continuous wall located at the bottom seals the bottom of the tubular space portion 14.

A joint portion 17 is provided at the tip of the flange 11 continuously along the axial direction of the material. The shape and the mounting position of the joint portion 17 of the steel material for constructing the underground continuous wall are designed to be the same as those of the joint portion 17 of the steel material for the shield opening, and the steel material for constructing the underground continuous wall and the steel material for the shield opening are made of the same material. When connecting in the axial direction, the joint portions 17 are continuously connected in the axial direction of the material.

Small holes 16 for bolt connection are formed in the upper and lower parts of the flange 11 for connecting another steel material in the axial direction of the material.
To provide. The bolt-jointing small holes 16 are not provided in a predetermined cylindrical space portion that requires waterproofing when connecting the steel material for constructing the underground continuous wall and the steel material for the shield opening in the material axial direction. The steel materials are connected by bolts through a splicing plate.
The steel materials may be connected by welding, and in this case, the small hole 16 for bolt connection is unnecessary.

It is preferable that the flange 11 is provided with a honeycomb-shaped hole (not shown) at a portion between the joint portion 17 and the position where the web 12 is attached to the end of the steel material for constructing an underground continuous wall. This honeycomb-shaped hole is provided in order to supply concrete from the portion sandwiched between the flanges 11 into the gap between the excavation groove and the flange when the underground continuous wall is constructed.

An example of the procedure of the method for constructing an underground continuous wall of claim 4 will be shown below. 3 to 7 are explanatory views showing an example of a method for constructing an underground continuous wall according to claim 4. Figure 3-
In FIG. 7, 1 is steel material for shield opening, 13 is opening space, 14 is cylindrical space, 17 is joint, 2a, 2b, 2
c is a steel material for constructing an underground continuous wall, 5 is the ground, 54 is an excavation trench,
7 indicates a bag.

(1) First, a groove having a predetermined width and a predetermined depth is excavated in the ground for a unit length (one element). In order to prevent groundwater from flowing into the trench, excavation work is performed while supplying a stable liquid into the trench. A guide wall may be constructed in advance in order to strengthen the ground surface and determine the element construction position during excavation work. (2) Exclude slime in the excavation trench and residual excavated soil suspended in the stabilizing solution. If necessary, while pumping the supernatant stabilizing liquid in the excavation groove, the stabilizing liquid is supplied from the bottom of the excavation groove through the pipe to exchange the stabilizing liquid in the excavation groove.

(3) The steel material 2a for constructing an underground continuous wall is supported on the upper part of the excavation ditch 54 filled with the stabilizing solution (see FIG. 3).
The steel material 2a for constructing an underground continuous wall is formed into a box shape by sealing the bottoms of the cylindrical space portions 14 located at the left and right ends. By sealing the bottom of the tubular space portion 14 to prevent the stable liquid from flowing into the tubular space portion 14, the steel material 2a for constructing an underground continuous wall constructs the volume of the tubular space portion 14 below the stable liquid level. Receive buoyancy. Therefore, there is an effect that the supporting load of the steel material 2a for constructing an underground continuous wall can be reduced.

At both ends of the steel material 2a for constructing an underground continuous wall,
A bag 7 made of hemp, polymer or the like is attached in advance with an adhesive tape or the like. The bag 7 is provided to smoothly perform the excavation work of the excavation groove for the subsequent element. That is, when excavating the excavation groove for the subsequent element, if the blade of the excavator hits the concrete of the preceding element, the excavation work is hindered.
In order to prevent the excavator blade from hitting the concrete of the preceding element, it is necessary to secure a space in advance at the end of the excavation groove of the preceding element. The bag 7 is provided to secure a space at the end of the excavation groove of the preceding element. In a later step, the bag 7 is filled with gravel and the like. When digging the excavation groove for the succeeding element, the gravel and the like in the bag 7 collapse along with the excavation, so that the end of the excavation groove of the preceding element is in the same state as the space previously secured. Also,
The bag 7 is attached so as to protect the joint portion 17, and the excavation groove 54
When the underwater concrete is placed inside, the underwater concrete is not placed in the joint portion 17.

(4) The steel material 1 for shield opening is connected on the steel material 2a for constructing underground continuous wall, and the bags 7 are attached to both ends of the steel material 1 for shield opening (see FIG. 4). . The steel material 2a for constructing an underground continuous wall and the steel material 1 for a shield opening are bolted to each other via a splicing plate (not shown).
The tubular space portion 14 of the steel material 2a for constructing an underground continuous wall and the tubular space portion 14 of the steel material 1 for a shield opening are continuously connected in the material axis direction. The connecting portion between the tubular space portions 14 is appropriately subjected to a water leakage prevention measure so that the stabilizing liquid does not enter the tubular space portion 14 when the steel material 1 for the shield opening is lowered into the excavation groove 54. To Further, the bag 7 is attached so as to protect the joint portion 17, and when the underwater concrete is placed in the excavation groove 54, the underwater concrete is not placed in the joint portion 17.

(5) The steel material for the shield opening is lowered into the excavation trench. The steel material for constructing the underground continuous wall and the steel material for the shield opening are subjected to buoyancy corresponding to the volume of the cylindrical space below the stable liquid level.

(6) At the upper part of the excavation ditch 54, the steel material 2b for constructing an underground continuous wall is connected to the steel material 1 for a shield opening, and the bags 7 are attached to both ends of the steel material 2b for constructing an underground continuous wall. (See Figure 5). Steel material for construction of underground wall 2
b and the steel material 1 for shield opening are bolt-bonded via a splicing plate (not shown). Cylindrical space part 14 of steel material 2b for underground continuous wall construction and cylindrical space part 1 of steel material 1 for shield opening
4 is continuously connected in the material axis direction. When the steel material 2b for constructing the underground continuous wall is unloaded into the excavation groove 54, the connecting portion between the tubular space portions 14 is appropriately treated to prevent water leakage.
Make sure that the stabilizing solution does not submerge in 4. Further, the bag 7 is attached so as to protect the joint portion 17, and when the underwater concrete is placed in the excavation groove 54, the underwater concrete is not placed in the joint portion 17.

(7) The steel material for constructing the underground continuous wall and the steel material for the shield opening are lowered into the excavation trench. The steel material for constructing the underground continuous wall and the steel material for the shield opening are subjected to buoyancy corresponding to the volume of the cylindrical space below the stable liquid level.

(8) At the upper part of the excavation groove 54, the steel materials 2b and 2c for constructing the underground continuous wall are connected, and the bags 7 are attached to both ends of the steel material 2c for constructing the underground continuous wall (see FIG. 6). The connecting portion between the cylindrical space portions is appropriately subjected to water leakage prevention treatment so that the stabilizing liquid does not enter the cylindrical space portion when the underground continuous wall building steel material 2b is lowered into the excavation trench 54.
The bag 7 is attached so as to protect the joint portion 17, and when the underwater concrete is placed in the excavation groove 54, the joint portion 17 is
Make sure that no underwater concrete is placed in the area.

(9) The underground continuous wall building steel material 2c is lowered until the underground continuous wall building steel material 2a reaches the bottom of the excavation groove, and then the bag 7 is filled with gravel and the like (see FIG. 7). (10) An underwater concrete is placed in the excavation groove with a tremie pipe to replace the stabilizing solution in the excavation groove with the underwater concrete. The solidification of the underwater concrete completes the construction of the main elements of the underground wall. It should be noted that it is possible to place a concrete other than the underwater concrete in the cylindrical space portion in which the inflow of the stabilizing solution is prevented.

Next, an example of a method of constructing an element of the underground continuous wall without a mirror opening will be described.
FIG. 8 is a schematic perspective view showing a small steel material which is an example of a steel material used for constructing an element having no mirror opening portion. In FIG. 8, 11 is a flange, 12 is a web, 17 is a joint part,
18 is a hole, 16 is a small hole for bolt connection.

The small steel material shown in FIG. 8 has a pair of plate-like flanges 11 and a pair of plate-like webs 12 mounted vertically on the surfaces of the flanges 11. The flanges 11 are arranged in parallel via a web 12. A joint portion 17 is continuously provided at the tip of the flange 11 along the material axis direction.
The flange 11 is provided with a honeycomb-shaped hole 18 at a portion between the attachment position of the web 12 and the joint portion 17. This hole 18 supplies the underwater concrete to the space between the wall surface of the excavation groove and the flange when the underwater concrete is placed by inserting the tremie pipe into the space sandwiched between the flanges 11. It is provided for the purpose of Small holes 16 for bolt connection for connecting another small steel material in the material axial direction are provided in the upper and lower portions of the flange 11. The steel materials are connected by bolts through a splicing plate. Further, the steel materials may be connected by welding, and in this case, the small holes 16 for bolt connection may not be provided.

An example of a method of constructing an element having no mirror opening will be shown below. 9 to 14 are explanatory views showing an example of a method of constructing an element without a mirror opening portion in the method of constructing an underground continuous wall according to claim 4. 9-
In FIG. 14, 3 is a small steel material shown in FIG.
Indicates a leading element, 5 indicates the ground, 54 indicates an excavation trench, and 7 indicates a bag.

(11) An excavation groove for constructing a succeeding element is excavated adjacent to the preceding element. Along with the excavation of the excavation groove, gravel and the like in the bag provided at the end of the excavation groove of the preceding element collapses. Therefore, the end of the excavation groove of the preceding element is equivalent to a space provided in advance, and contact between the concrete of the preceding element and the blade of the excavator can be prevented.

(12) The small steel material 3 for constructing the subsequent element is supported on the upper part of the excavation groove 54, and the joint portion 17 of the small steel material 3 is supported.
And the joint portion 17 of the preceding element 85 are engaged with each other (see FIG. 9). (13) The small steel material 3 is gradually lowered into the excavation groove 54, and the preceding small steel material 3 and the subsequent small steel material 3 are connected at the upper part of the excavation groove 54 (see FIG. 10). The small steel materials 3 are connected by bolts through a splicing plate (not shown).

(14) The small steel material 3 is gradually lowered into the excavation groove 54. At the upper part of the excavation groove 54, the subsequent small steel material 3 is connected on the small steel material 3 connected in the step (13) (see FIG. 11). The small steel materials 3 are connected by bolts through a splicing plate (not shown). Since the joint portion of the preceding small steel material 3 and the joint portion of the following small steel material 3 are continuously connected,
The joint portion 17 of the subsequent small steel material 3 automatically meshes with the joint portion 17 of the preceding element 85.

(15) The small steel material 3 is gradually lowered into the excavation groove 54, and the succeeding small steel material 3 is connected to the preceding small steel material 3 at the upper portion of the excavation groove 54 as in the step (14). After connecting the steel materials, the row of small steel materials 3 connected in the axial direction of the material is cut into the excavation groove
4 Lower to the bottom (see Figure 12). (16) Hereinafter, the procedure of the steps (13), (14), and (15) is repeated to set a predetermined number of rows of the small steel materials 3 in the excavation groove 54 (see FIG. 13). When the row of small steel materials 3 at the end of the excavation groove (construction direction of subsequent element) is set up, in order to secure a space at the end of the excavation groove and prevent concrete from being placed in the joint 17, The bag 7 is attached to the end.

(17) A bag attached to the row of small steel materials located at the end of the excavation groove (direction of constructing the subsequent element) is filled with gravel and the like. (18) Place a submerged concrete in the excavation groove with a tremie pipe. The stabilizing solution in the trench is replaced with an underwater concrete. The solidification of the underwater concrete will complete the subsequent elements of the continuous underground wall.

(19) Thereafter, the above steps (11) to (18) are repeated to arrange the elements in a cylindrical shape to complete the underground continuous wall. When constructing the last element in which the underground continuous wall is closed in a cylindrical shape, the joint portion 17 of the row of the small steel materials 3 that is last to be erected in the excavation groove 54 meshes with the joint portion 17 of the first constructed preceding element 85 ( (See FIG. 14). In addition, in the joint portion of each element, it is necessary to mesh two pairs of the joint portions of the steel material forming the underground continuous wall. Even if the underground continuous wall is constructed in a cylindrical shape, the outer circumference of the underground continuous wall is usually sufficiently long, so that two pairs of steel joints can be engaged with each other depending on the degree of freedom of the joints. When the outer circumference of the underground continuous wall is short, of the flanges of the steel material arranged at the end portions of the element, the width of the flange on the outer peripheral side of the underground continuous wall is designed to be large, and two pairs of the steel joint portions are engaged with each other.

After the underground continuous wall is constructed by the above procedure, the inner ground surrounded by the underground continuous wall is excavated to a predetermined depth. While excavating, the inner wall surface of the underground continuous wall is lined with a shaft main body wall made of reinforced concrete, steel frame concrete or steel frame reinforced concrete by the reverse winding method. Upon lining the shaft body wall, the concrete of the inner wall of the underground continuous wall is once dropped to expose the flange opening surfaces of the steel material for the shield opening, the steel material for constructing the underground continuous wall, and the small steel material. Steel pipes for shield openings, steel pipes for constructing underground continuous walls, and small steel pipes are provided with dowels and studs, and the shaft main wall is lined to integrate the continuous underground wall with the shaft main wall. After excavating the ground to a predetermined depth and lining the shaft main wall, a reinforced concrete bottom is constructed on the bottom of the excavated ground to complete the shaft. Do not line the vertical shaft wall on the mirror opening. Further, a ring-shaped steel material is buried in the shaft main body wall around the mirror opening.

Next, as an example of the method of opening the shaft of the shaft according to the invention of claim 5 and the invention of claim 6, a method of opening the shaft of the shaft constructed by the above procedure will be described. FIG. 15 shows claim 5.
FIG. 7 is a schematic cross-sectional view of a shield machine used in the method of opening the mirror of the vertical shaft of the invention of FIG. In FIG. 15, 4 is a shield machine, 41 is a motor with reduction gear, 42 is a face plate, 42a is a bid, 43 is a chamber, 44 is a mud pipe, 45 is a skin plate, 46 is a packing, 47 is an elector, 48 is a shield jack, 91 is a segment, and 92 is a reaction force stand.

This shield machine 4 is a motor with a reduction gear.
The surface 42 is rotated by 41 and the ground is excavated by the bit 42a. A manhole (not shown) is provided on the face plate 42, and the earth and sand excavated by the bid 42a and groundwater are taken into the chamber 43 from the manhole. The chamber-43 is provided with a mud pipe (not shown). During excavation, mud water is supplied from the mud pipe into the chamber-43, and the pressure in the chamber-43 is kept constant. The earth and sand in the chamber-43 and the groundwater mixed with the earth and sand are carried and discharged by the sludge pipe 44. The discharge of earth and sand, groundwater, etc. is controlled so that the pressure in the chamber 43 is constant. The segments 91 are arranged in a shield tunnel shape in the inner circumferential direction of the skin plate 45 by the erector 47. A packing 46 is provided on the inner surface of the rear portion of the skin plate 45 to ensure water shutoff between the segments 91 arranged in a shield tunnel shape and the skin plate 45. When the shield jack 48 is operated after the segment 91 is provided, the shield machine 4 receives the reaction force from the segment 91 and moves forward.

16 to 18 are schematic explanatory views for explaining one embodiment of the method of opening the shaft of the shaft according to the fifth and sixth aspects. FIG. 16 is a schematic perspective view in the vicinity of a mirror opening portion of a vertical shaft, showing a partial schematic cross section. 17 and 1
8 shows a cross-sectional view near the mirror opening portion of the vertical shaft. Figure 1
6 to 18, 1 is a steel material for shield opening, 84
Is a mirror opening portion, 6 is an elastic body, 81 is an underground continuous wall, 87 is a shaft main wall, 88 is a ring-shaped steel material, 4 is a shield machine,
Reference numeral 45 is a skin plate, 46 is a packing, 91 is a segment, 94 is a pump, 62 is a backfill material, and 61 is a water blocking steel material. An embodiment of the method for opening the shaft of the shaft according to the invention of claim 5 will be described below.

(1) Underground continuous wall 8 forming the outer wall of the shaft
The wall body portion of the wall body portion 1 in which the opening space portion of the steel material 1 for shield opening is buried is defined as a mirror opening portion 84. An elastic body 6 having a hole having the same outer shape as the shield of a shield machine used for excavation is installed on the shaft main body wall 87 in front of the mirror opening 84 (see FIG. 16). Between the elastic body 6 and the shaft main body wall 87, appropriate treatment is performed so as to ensure the waterproofness. A ring-shaped steel material 88 having an inner diameter larger than the outer size of the elastic body is embedded in the vertical shaft main wall 87. The ring-shaped steel material 88 is preferably provided with projections or ridges on its side surface in order to secure the adhesive force with the concrete. The end surface of the ring-shaped steel material 88 is embedded in the wall surface inside the shaft main body wall 87 in an exposed state.

(2) Lower the shield machine in the vertical shaft,
Segments are arranged in a shield tunnel shape from the rear of the shield machine starting from a reaction force stand installed in the shaft.
The shield machine receives a reaction force from the reaction force base every time the segment is installed, and moves forward. The skin plate of the shield machine is inserted into the hole of the elastic body installed on the main wall of the shaft as the shield machine progresses. Since the hole portion of the elastic body has the same outer shape as the skin plate of the shield machine, the waterproofness between the shield machine and the elastic body is ensured.

(3) A shield machine excavates the wall portion of the underground continuous wall corresponding to the opening space of the steel material for the shield opening. (4) Before the shield machine 4 penetrates the underground continuous wall 81 and the rear part of the skin plate 45 of the shield machine 4 passes through the elastic body 6, the shield machine 4 is arranged in a shield tunnel inside the shaft. The water stopping steel material 61 is applied between the outer periphery of the segment 91 and the exposed portion of the ring-shaped steel material 88, and the periphery of the mirror opening portion is hermetically welded (see FIG. 17). This allows the sea
Even if excavation by the rudder machine progresses, the water stop inside the shaft will be secured.

Next, an embodiment of a method of opening a vertical shaft mirror according to the invention of claim 6 will be described. A method of opening a mirror of a vertical shaft according to a sixth aspect of the present invention relates to a method of opening a mirror from the outside of the vertical shaft by a shield machine that has been advanced while excavating underground. (1) The wall surface of the underground continuous wall forming the outer wall of the shaft where the steel material for the shield opening is buried is used as a mirror opening. An elastic body having a hole with the same outer shape as the skin plate of the shield machine is installed on the shaft main body wall in front of the mirror opening. (2) When the shield machine reaches the outer wall of the continuous underground wall,
The underground machine is directly excavated by a shield machine. When the shield machine penetrates the wall of the underground continuous wall, the skin plate of the shield machine is inserted into the hole of the elastic body. Therefore, the water blocking property between the shield machine and the elastic body is ensured.

(3) The rear part of the skin plate 45 of the shield machine 4 passes through the underground continuous wall 81 and the elastic body 6
Before finishing the passage, the backfill material 62 is press-fitted into the gap between the outer periphery of the segment 91 constituting the shield tunnel and the wall of the underground continuous wall 81 (see FIG. 18). Shield tunnel 9
Predetermined segment 9 among the segments 91 constituting
1 is provided with an opening / closing port for supplying the backfill material 62. The backfill material 62 is supplied from the inside of the shield tunnel 9 through this opening / closing port. By pressing the backfill material 62 into the gap between the outer periphery of the segment 91 of the shield tunnel 9 and the wall of the underground continuous wall 81 with the pump 94, the waterproofness of the shield tunnel 9 and the underground continuous wall 81, that is, the inside of the shaft. Water resistance is secured.

In the method for opening the shaft of the vertical shaft according to the present invention, the elastic body may be provided on the wall of the underground continuous wall. For example, in the case of constructing a shaft wall body only with an underground continuous wall, after constructing the underground continuous wall, some of the concrete on the wall surface layer around the mirror opening part is removed, and the ring-shaped steel material is buried in the underground continuous wall. The end surface of the ring-shaped steel material is projected from the wall surface of the underground continuous wall by a predetermined height, and the elastic body is inserted inside the ring-shaped steel material.

[0069]

The steel material for a shield opening of the present invention is constructed by using the steel material for a shield opening because an opening space portion is provided so as to penetrate from one flange to the other flange. The underground continuous wall can directly excavate the wall body corresponding to the opening space by a shield machine. For this reason, there is an effect that it is possible to omit the conventional work of removing the steel material required to open the mirror of the continuous underground wall, the work of removing the concrete by human power, and the work of improving the ground.

Further, the steel material for shield opening of the present invention is provided with a cylindrical space portion on the left and right of the opening space portion, and in addition to this, at the time of constructing a continuous underground wall, stable liquid inflow into the cylindrical space portion. By providing the preventive means, it is possible to reduce the steel material supporting load when the underground continuous wall is constructed.

Further, the steel material for a shield opening of the present invention is provided with an inro joint joint on at least one of the upper end and the lower end of the tubular space, so that the shield can be constructed when an underground continuous wall is constructed. This has the effect of facilitating alignment when connecting the steel material for openings and the steel material for constructing underground continuous walls.

In the method for constructing an underground continuous wall of the present invention, a steel material for a shield opening and a steel material for constructing an underground continuous wall, which have the same flange face spacing and web attachment position of steel, are connected in the axial direction, and By closing the bottom of the cylindrical space of the steel material for the shield opening located at the bottom or the steel material for constructing a continuous underground wall, the steel material for the shield opening and the underground continuation are introduced into the excavation ditch filled with stable liquid. When the steel for wall construction is raised, there is an effect that it is possible to reduce the supporting load of the steel for shield opening and the steel for underground continuous wall construction.

In the method for opening the shaft of the shaft according to the present invention, a part of the wall of the shaft is composed of an underground continuous wall in which the steel material for the shield opening is buried, and the opening space of the steel material for the shield opening is Since the wall part located is mirror-opened directly by the shield machine, there is an effect that the work of melting and removing the steel material by the human power at the time of mirror opening, the work of removing the concrete by the human power, and the ground improvement work can be omitted.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a steel material for shield opening according to the invention of claim 3.

FIG. 2 is a schematic perspective view showing an example of a steel material for constructing an underground continuous wall which is connected in the axial direction of the steel material for a shield opening shown in FIG.

FIG. 3 is an explanatory diagram showing an example of a method of constructing an underground continuous wall according to claim 4;

FIG. 4 is an explanatory view showing an example of a method of constructing an underground continuous wall according to claim 4;

FIG. 5 is an explanatory diagram showing an example of a method of constructing an underground continuous wall according to claim 4;

FIG. 6 is an explanatory diagram showing an example of a method of constructing an underground continuous wall according to claim 4;

FIG. 7 is an explanatory diagram showing an example of a method of constructing an underground continuous wall according to claim 4;

FIG. 8 is a schematic perspective view showing a small steel material as an example of a steel material for constructing an element having no mirror opening portion in the method for constructing an underground continuous wall according to claim 4;

FIG. 9 is an explanatory diagram showing an example of a method of constructing an element which does not have a mirror opening part among the elements constituting the underground continuous wall in the method of constructing an underground continuous wall of claim 4;

FIG. 10 is a method for constructing an underground continuous wall according to claim 4,
It is explanatory drawing for showing an example of the construction method of the element which does not provide a mirror opening part among the elements which comprise an underground continuous wall.

FIG. 11 is a method for constructing an underground continuous wall according to claim 4,
It is explanatory drawing for showing an example of the construction method of the element which does not provide a mirror opening part among the elements which comprise an underground continuous wall.

FIG. 12 is a method for constructing an underground continuous wall according to claim 4,
It is explanatory drawing for showing an example of the construction method of the element which does not provide a mirror opening part among the elements which comprise an underground continuous wall.

FIG. 13 is a method for constructing an underground continuous wall according to claim 4,
It is explanatory drawing for showing an example of the construction method of the element which does not provide a mirror opening part among the elements which comprise an underground continuous wall.

FIG. 14 is a method for constructing an underground continuous wall according to claim 4,
It is explanatory drawing for showing an example of the construction method of the element which does not provide a mirror opening part among the elements which comprise an underground continuous wall.

FIG. 15 is a schematic cross-sectional view showing an example of a shield machine used in the method of opening a shaft of a shaft according to claims 5 and 6;

FIG. 16 is a schematic perspective view showing a positional relationship between a mirror opening portion and an elastic body in an embodiment of a method for opening a vertical shaft mirror according to claims 5 and 6;

FIG. 17 is an explanatory view showing an example of a method of opening a mirror of a vertical shaft according to claim 5;

FIG. 18 is an explanatory view showing an embodiment of a method of opening a mirror of a vertical shaft according to claim 6;

FIG. 19 is a schematic view showing a conventional shield tunnel and a vertical shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel material for shield opening 11 Flange 12 Web 13 Open space part 14 Cylindrical space part 15 Inro joint part 17 Joint part 2a Steel for underground continuous wall construction 2b Steel for underground continuous wall construction 2c Steel for underground continuous wall construction 4 Shield machine 45 Skin plate 6 Elastic body 62 Backfill material 9 Shield tunnel 61 Steel for water stop 81 Underground continuous wall 87 Vertical shaft main wall 88 Ring steel 9 Shield tunnel 91 segment

Claims (6)

[Claims] 1. A pair of plate-like flanges arranged in parallel and a plurality of plate-like webs vertically attached to the flange, and an opening space portion penetrating from one of the flanges to the other. A steel material for a shield opening, which is characterized in that 2. The steel material for a shield opening according to claim 1, further comprising a cylindrical space surrounded by a flange surface and a web connecting the flange surfaces to the left and right of the opening space. 3. The steel material for a shield opening according to claim 2, wherein an ingot joint is formed on at least one of the upper end and the lower end of the tubular opening. 4. (1) A cylindrical space portion having a pair of plate-like flanges arranged in parallel and a plurality of plate-like webs vertically attached to the flanges, the flange being surrounded by the webs. A steel material for constructing an underground continuous wall having: (2) a steel material for a shield opening according to claim 2, wherein the steel material for constructing an underground continuous wall has the same flange surface interval and the same web mounting position. Or, a plurality, together with connecting, to seal the bottom of the tubular space portion of the steel material for constructing the underground continuous wall or the steel material for the shield opening to be arranged at the bottom, in the excavation groove filled with a stabilizing solution. A method of constructing an underground continuous wall having a step of standing up. 5. A shaft comprising at least a part of a wall body formed by an underground continuous wall composed of a steel structure partially including the steel material for a shield opening according to claim 1 and a concrete structure,
A method for opening a shaft of a vertical shaft directly excavated by a shield machine, wherein a wall portion of an underground continuous wall in which an opening space of a steel material for the shield opening is located is used as a mirror opening portion, and (1) a skin plane of a shield machine. -A step of installing an elastic body having a hole having substantially the same outer shape as that of the girder on the underground continuous wall body or the shaft main body wall in accordance with the position of the mirror opening, (2) The skin plate of the shield machine Inserting into the hole of the elastic body, excavating the mirror opening part of the underground continuous wall in front of the shield machine with the shield machine while arranging the segments behind the shield machine in a shield tunnel shape,
(3) Before the rear part of the shield plate of the shield machine reaches and passes through the hole of the elastic body, the outer periphery of the segment arranged in a shield tunnel inside the shaft and the underground continuous wall or shaft. A method for opening a shaft of a vertical shaft, comprising a step of sealing a main body wall from the inside of the vertical shaft. 6. A vertical shaft, at least a part of which is constituted by an underground continuous wall made of concrete and a steel structure partially containing the steel material for shield opening according to claim 1,
A method for opening a shaft of a vertical shaft directly excavated by a shield machine, wherein a wall portion of an underground continuous wall in which an opening space of a steel material for the shield opening is located is used as a mirror opening portion, and (1) a skin plane of a shield machine. -A step of installing an elastic body having a hole having substantially the same outer shape as that of the grate on the wall of the underground continuous wall or the wall of the vertical shaft in accordance with the position of the mirror opening, (2) reaching the outer surface of the underground continuous wall from the outside of the vertical shaft With the shield machine, (3) before the rear end of the skin plate of the shield machine penetrates the wall of the underground continuous wall and has finished passing through the hole of the elastic body, A method of opening a shaft of a vertical shaft, comprising a step of supplying a filler from the inside of the shield tunnel to a gap between the outer periphery of the segment arranged in a tunnel shape and the wall of the underground continuous wall or the wall of the vertical shaft to seal the space.