JP2881666B2 - Shield tunneling machine and shield tunnel construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a shield tunneling machine and a shield tunnel, and more particularly to a method for constructing a shield tunnel using a construction material such as cast-in-place concrete. The present invention relates to a method for constructing a shield tunnel machine and a shield tunnel.

[0002]

2. Description of the Related Art In a construction method in a shield tunnel, a construction method using cast-in-place concrete is usually performed.
Using a shield excavator having a cylindrical outer shape, while excavating the ground with a cutter device provided in front of the shield excavator, covering the peripheral wall of the excavated tunnel with a form at a predetermined interval, and forming the form. And a step of placing concrete, placing concrete, pressing the concrete by operating a pressing jack, and advancing the entire shield machine.

By the way, in such a construction method, an end frame ring is provided at the tip of the pressing jack so as to close the space between the formwork and the peripheral wall of the tunnel. This wife frame ring is re-arranged at the time of rebar assembly, and moves with the rod of the pressing jack. At this time, it becomes impossible to maintain the pressure of the concrete,
Groundwater is mixed in and high quality concrete cannot be cast, causing concrete breakage and water leakage. In order to rely on the strength of the concrete, there is a problem that curing of the concrete is required until the strength of the concrete is developed, and the construction time becomes long.

As a means for solving such a problem, the prior art has disclosed an annular pressure ring for retaining the compression of concrete by taking a reaction force in cast-in-place concrete between the formwork and the peripheral wall of the tunnel. A means for disposing while holding by tie rods and embedding in a footwear material is disclosed (Japanese Unexamined Patent Publication No. 1-1900900 "cast-in-place shield excavator").

[0005]

However, the following problems to be solved still remain even by such prior art means. First, in the prior art means, the pressure retaining ring lacks an auxiliary formwork for adjusting the meandering of the shield, thereby creating a considerable gap in the pressure retaining ring and insufficient pressure retention. It is. In addition, since there is no margin for adjusting the meandering of the shield machine for the curve construction or the like, there is a problem that the curve construction cannot be performed or the concrete is cracked. Second
In addition, since there is no pressure maintaining device for always keeping the concrete pressure higher than the ground pressure, even if the pressure can be maintained at first, the pressure gradually decreases. Third, even if the pressure can be maintained during excavation, the concrete cannot be maintained at the time of assembling the reinforcing steel bar and the formwork, so that the soil pressure and the water pressure of the ground cause destruction and leakage of the concrete. In order to rely on the strength of the concrete, curing of the concrete is required, and the construction time becomes long.

[0006] The present invention effectively solves the above-mentioned problems, and an object of the present invention is to keep the pressure of the abrasion material constantly higher than the earth pressure and water pressure of the ground, even in a curve construction, etc. An object of the present invention is to provide a shield tunneling machine capable of assembling and placing concrete and performing high-quality work, and to provide a work method for a shield tunnel.

[0007]

According to a first aspect of the present invention, there is provided a shield machine comprising: a cylindrical skin plate forming an outer shell; and a driving means provided at a front end of the skin plate. In a shield excavator equipped with a cutter device to excavate and a propulsion jack whose base end is connected to a partition plate formed inside the skin plate,
A tail portion of the skin plate is formed by an outer cylinder and an inner cylinder, and the inner cylinder is formed in a double form, and a rotatable connection between the outer cylinder and the inner cylinder of the tail section is formed by a shield excavator. In the connecting portion, a spherical convex portion is provided on the outer surface of the outer inner cylinder, and a spherical concave portion for fitting the spherical convex portion is provided on the inner surface of the outer cylinder. A plurality of concrete piston chambers are provided between the inner cylinders to form a plurality of partition walls extending in the radial direction of the skin plate and accommodate the extrusion piston.The inner inner cylinder is free of disassembly and movement regardless of the movement of the shield machine. A formwork is provided, and a shield jack for making the formwork a reaction force is provided.

A shield machine according to a second aspect of the present invention is the shield machine according to the first aspect, wherein the shield machine is moved and fixed between the inner cylinder and the outer cylinder in a forward portion with respect to the traveling direction of the shield machine. And a plurality of connecting portions that can be freely provided.

According to a third aspect of the present invention, there is provided a method for forming a shield tunnel, wherein a peripheral wall of a tunnel excavated at a predetermined interval is formed while excavating a ground by a cutter device at a tip of the shield machine. A method for covering a tunnel, in which a reinforcing material is provided between the formwork and the peripheral wall and a material for supplying the material is provided to cover the inner surface of the tunnel, the method comprising: At the time of placing the rebar and assembling the formwork inside the rebar, the main end frame that closes between the inner cylinder and the formwork with the arrangement of the rebar so that the outer end contacts the inner surface of the inner cylinder At the same time as setting, the concrete pressure applied to the wife frame is taken as a substitute for the separator by connecting the reinforcing bars, and the gap between the inner end of the main wife frame and the outer surface of the mold is formed from the inside of the mold by the auxiliary wife. Extend the frame After laying, the material is poured into the rebar assembly room surrounded by the inner cylinder, the formwork and the splice frame, while the material is poured from the concrete piston room between the formwork and the ground. At the time when the pressure of the reinforcing material in the rebar assembly room and the pressure of the external abrading material are equal, the rear auxiliary frame is taken out and the shoe material in the rebar assembling room and the external abrading material are integrated, The pressure holding jack presses the extruding piston in the concrete piston chamber so that the pressure of the abrasion material is higher than the earth pressure and water pressure of the ground. When excavating in a direction different from the axis of the frame, the rotatable connection provided between the outer cylinder and the inner cylinder allows the space between the inner cylinder and the formwork to be increased regardless of the direction of excavation of the shield excavator. Place concrete while keeping it constant, and履工 method of shield tunnel, characterized in that to excavation of de excavator.

According to a fourth aspect of the present invention, there is provided a method for constructing a shield tunnel, comprising the steps of: arranging a reinforcing bar inside the inner cylinder of a tail portion of the shield machine; and forming a formwork inside the reinforcing bar. Along with the placement of the rebar, set the main wive frame that closes between the inner cylinder and the formwork so that the outer end is in contact with the inner surface of the inner cylinder, and connect the rebar with the concrete pressure applied to the wive frame. After serving as a separator and closing the gap between the inner end of the main wive frame and the outer surface of the form by protruding the auxiliary wive from the inside of the form, the inner cylinder, the form, and the form While placing the material into the rebar assembly room surrounded by the concrete piston chamber, and placing the material between the formwork and the ground from the concrete piston chamber. Pressure of footwear material is other When the shield excavator digs in a direction different from the axis of the footing formwork during construction of a curved section, etc. while pressing so that the pressure becomes higher than the earth pressure and water pressure, the outer cylinder and inner cylinder of the tail part Between, a rotatable connection provided at the rear of the shield machine in the traveling direction, an outer inner cylinder,
Between the outer cylinder, by a plurality of movable and fixed connecting portions provided in the front portion with respect to the traveling direction of the shield excavator, while controlling the interval between the shield machine during excavation and the formwork In addition, concrete is poured, and a shield machine is excavated.

[0011]

According to the shield machine of the first aspect, since the concrete piston chamber is provided by forming the partition wall, a plurality of concrete piston chambers can be manufactured in a factory or the like in advance. Therefore, the concrete piston chamber can be manufactured with high accuracy, and the piston can be safely removed from the concrete piston chamber after the concrete is hardened, so that the seal can be easily replaced. In the connection portion provided at the rear portion in the traveling direction of the shield machine, a spherical convex portion is provided on the outer surface of the outer inner cylinder, and a spherical concave portion for fitting the spherical convex portion is provided on the inner surface of the outer cylinder. Therefore, the connecting portion can be freely rotated.

According to a second aspect of the present invention, there is provided a shield machine having the same function as that of the first embodiment, and the movable body can be freely moved and fixed between the inner cylinder and the outer cylinder in a forward direction with respect to the traveling direction of the shield machine. Since the plurality of connection portions are provided, the inner cylinder can be freely rotated, and the shield machine can be freely rotated regardless of the installation position of the formwork. Therefore, it is possible to adjust the meandering of the shield excavator, and even if the position of the piston chamber and the shield excavator relatively fluctuate during the curve construction, it does not apply extra force to the concrete piston chamber itself, so that the curve construction can be performed. Easy to do. In addition, the pressure of the concrete can be reliably maintained.

According to a third aspect of the present invention, the pressures of the extruding pistons in the plurality of concrete piston chambers formed in the tail portion are individually controlled by the pressure holding jacks, so that each of the plurality of concrete piston chambers is controlled. Since the pressure of the construction material can be individually controlled, it is possible to easily cope with the difference in the ground pressure due to the height, and always keep the pressure of the footwear material higher than the earth pressure and water pressure of the ground. Becomes possible. Further, by such an operation, the tail void is reliably filled with the footwear material, and there is no danger of sinking. In addition, when assembling the rebar, a main wife frame is arranged in contact with the inner surface of the inner cylinder of the shield machine, and an auxiliary wife frame is connected to the main wife frame from the inside of the mold continuously, and the Since the space with the excavator is closed, even if the size of the gap between the inner cylinder and the outer periphery of the formwork changes due to the meandering of the shield excavator, by adjusting the length of the auxiliary wife frame, It is possible to cope with the meandering and to reliably maintain the pressure of the footwear material. Further, when the supply pressure of the footwear material becomes larger than the set holding pressure of the pressure holding jack, the supply pressure of the footwear material causes the extruding piston to move forward of the shield machine,
The extruding piston moves to the rear of the shield machine when pushing out the work material and forward when putting the work material in the piston chamber, so that the pressure in the concrete piston chamber can be kept almost constant even when the work material is supplied. It becomes possible.

According to the method for constructing a shield tunnel described in claim 4, a plurality of connecting portions having the function described in claim 3 and movable and fixed forward in the traveling direction of the shield machine are provided. Because it is provided, the shield machine can be freely rotated regardless of the installation position of the formwork, the meandering of the shield machine can be adjusted, and the position of the piston chamber and the shield machine can be relatively , Without giving extra force to the piston chamber itself,
Easy curve construction. In addition, the pressure of the concrete can be reliably maintained.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the vicinity of a face of a tunnel in the middle of construction according to the present invention. In the figure, reference numeral 10 denotes a shield machine.
While excavating the tunnel T to the left side with respect to the paper surface by the cutter device 12 provided at the front thereof, the mold 1 is formed at predetermined intervals on the peripheral wall of the tunnel T formed behind the shield excavator 10. And a reinforcing material U is arranged between the formwork 1 and the peripheral wall, and a work material is supplied to build a work wall W on the inner surface of the tunnel.

The mold 1 is mainly composed of a face plate 1a and a support frame 1b for supporting the face plate 1a, and the face plate 1a of some molds (upper mold) has a mold. A joint portion 1c for connecting a casting pipe 2 for casting a work material is provided outside the frame, and a storage groove 1d for storing an auxiliary wife frame 51 to be described later so as to be freely retractable is provided. The joint 1c is provided with a shutter mechanism 3 for opening and closing the filling port of the joint 1c (see FIG. 5).

Next, the shield machine 10 for implementing the tunnel lining method according to the present invention will be described in more detail. The shield machine 10 comprises a cylindrical skin plate 11 forming an outer shell, and a skin plate A cutter device 12 provided at a front end portion of the skin plate 11 and rotated by driving means (not shown) to excavate the ground; a propulsion jack 13 having a base end connected to a partition plate 11a formed inside the skin plate 11; It is a basic structure equipped with.

The tail portion of the skin plate 11 has an outer cylinder 20 having the same diameter as the skin plate 11 and constituting a part of the skin plate 11, and is formed inside the outer cylinder 20 so as to have a smaller diameter than the outer cylinder 20. The inner cylinders 21a and 21b are connected to each other by a plurality of partition walls 22 extending in the radial direction of the skin plate 11, as shown in FIGS. I have. A plurality (four in the illustrated example) of concrete piston chambers 23 are provided between the inner cylinders 21a and 21b, and an extrusion piston 24 is slidably housed in each of the concrete piston chambers 23.

As shown in detail in FIGS. 1 to 3, the pushing piston 24 is formed in such a size that it fits tightly in the concrete piston chamber 23 in accordance with the internal shape of the concrete piston chamber 23. Board 11a
Is configured to slide back and forth by a plurality of pressure holding jacks 25 each having a base end attached thereto. That is, the extruding piston 24 moves to the rear of the shield machine 10 when extruding the concrete, and moves forward when putting the concrete into the concrete piston chamber 23. The pressure holding jack 25 for operating the pushing piston 24 is provided with a relief valve.
When the driving pressure of the lining material supply pump 31 becomes larger than the holding pressure of the jack, the jack contracts. For this reason, the pressure holding jack 25
The pressure can be freely set individually, and the concrete pressure can always be kept higher than the earth pressure and water pressure of the ground by corresponding to the difference of the ground pressure depending on the height.

As shown in FIG. 4, a mounting portion 70 of the pressure holding jack 25 to the shield machine 10 is formed rotatably by, for example, a universal joint, and a mounting portion 71 to the pushing piston 24 is For example, it is formed rotatably by a pin, and has a structure that can rotate together. A plurality of connecting portions 72 are provided at a rear portion with respect to the traveling direction of the shield machine 10. In this connection part 72,
A spherical concave portion 73 is attached to the inner surface of the rear end of the outer cylinder 20, and a spherical convex portion 74 fitted to the spherical concave portion 73 is attached to the outer surface of the rear end of the outer inner cylinder 21a. For the curvature of the spherical concave portion 73 and the convex portion 74, a part of a spherical type having substantially the same radius is used.
Is positioned near the central axis of the outer cylinder 20 and has a radius longer than the radius of the outer inner cylinder 21b and smaller than the radius of the outer cylinder 20 (indicated by R in FIG. 4). As shown in FIG. 10, the rear end side wall of the spherical convex portion 74 contacts the rear end of the spherical concave portion 73 so that the spherical convex portion 74 prevents the rearward movement. May be provided.

On the other hand, as shown in FIG.
A plurality of connecting portions 80 which can be freely moved and fixed forward with respect to the traveling direction of the shield machine 10 are provided between the distal end portion of the outer excavator 20 and the outer cylinder 20. This connection unit 80 is, for example,
It has a structure that can be freely moved and fixed by jacks and the like. Therefore, the inner cylinders 21a and 21b can be freely moved,
During the excavation of the shield excavator 10, the inner inner cylinder 21b
And the distance between the outer cylinder 20 and the outer cylinder 20 can be freely adjusted.
In addition, this connection part 80 is provided with
It may be provided between the outer cylinder 20.

A plurality of (two in this embodiment) seal members 26 are attached to the outer periphery of the pushing piston 24, and the inside of the skin plate 11 and the inside of the concrete piston chamber 23 are located at the center of the pushing piston 24. And a filling hole 24a made of a lining material communicating with the inner surface of the pushing piston 24.
A joint 27 is provided, which communicates with a and is connected to the casting pipe 30 of the lining material (see FIG. 5). In the embodiment, the filling hole 24a is pushed out of the piston 2
4, the present invention is not limited to this embodiment.

The filling hole 24a has a filling hole 24a.
A shut-off mechanism 28 for opening and closing a is provided (see FIG. 5), so that the filling hole 24a can be opened and closed as needed. Note that, specifically, this blocking mechanism 28
It consists of a shutter, a valve, etc.
Other configurations may be used as long as they can open and close 4a.

In FIG. 1, reference numeral 30 denotes a casting pipe for lining material, and this casting pipe 30 is a branch valve 33 connected to a supply pipe 32 of a supply pump 31 for lining material.
Is connected at one end, and concrete or the like extruded by the supply pump 31 is divided by a branch valve 33,
Each concrete piston chamber 23 is entered. The casting pipe 30 connecting the supply pump 31 and the concrete piston chamber 23 itself is constituted by a flexible pipe or a telescopic pipe so that it can cope with the movement of the extrusion piston 24.

In the figure, reference numeral 50 denotes the inner inner cylinder 21b.
Is a main wife frame that closes the space between the main wife frame 5 and the mold 1.
0 has a basic configuration in which a plurality of plate bodies 50a curved in accordance with the curvature of the inner surface of the inner inner cylinder 21b are combined in a ring shape in the longitudinal direction, as shown in FIG. Further, the inner end 50b of the main wife frame 50 is machined so as to be concentric with the outer end thereof.
G is changed by the meandering of the shield machine 10 because of the meandering of the shield machine 10, so that the size of the gap G is set to be larger than the meandering amount, and the main wife frame 50 is placed inside the lining material. Needless to say, it is designed so that it is not exposed.

In the gap between the mold 1 and the main wife frame 50, an auxiliary wife frame 51 for closing the gap is set. A notch 51b (see FIG. 6) fitted to the main wife frame 50 is provided at the outer end of the auxiliary wife frame 51.
At the time of setting with the main wife frame 50, the cut-out 51 b is aligned so that the driving pressure of the lining material can be transmitted to the main wife frame 50. Further, the auxiliary wife frame 51 may be attached to the form frame by directly bolting, or may be pressed from inside. Incidentally, similarly to the main wife frame 50, the auxiliary wife frame 51 is also configured to form a ring by combining a plurality of plate bodies 51a in the circumferential direction. Four plate bodies 51
A tapered surface is formed at the joint of a so that the auxiliary wive frame 51 can be assembled in a ring shape from the inside of the inner cylinder 21 (see FIG. 2).

A flange metal member 50 is provided between the mold 1 and the inner inner cylinder 21b as a main frame 50, and the flange metal member 50 is used as a member in the circumferential direction of the structure and is included in the abrasion material. It may be buried. In order to oppose the pressure of the material to be ground, the necessary number of rebars are connected to the flange hardware 50 as separators so that the whole number is connected to the flange hardware 50. Set up hardware to handle the pressure on the wife frame. This flange metal part 50 is connected to the inner cylinder 21 b of the concrete piston chamber 23.
Since the inner inner cylinder 21b is hardly deformed, the curvature of the outer periphery of the flange hardware 50 is changed to the inner inner cylinder 21b.
By processing according to the curvature of the inner circumference of b, there is almost no gap.

It is also possible to attach a sealing material to the outer peripheral portion of the flange hardware 50. The inner end 50b of the flange metal part 50 is machined so as to be concentric with the outer peripheral end thereof.
Since the size of the gap s on the outer periphery of the shield excavator 10 varies due to the meandering of the shield machine 10, the gap s is set to be larger than the meandering amount, and the flange hardware 50 is not exposed to the inside of the footwear material. An auxiliary wife frame 62 is set in the gap s between the flange hardware 50 and the mold 1. In the auxiliary wive frame 62, the vertical cross section has a shape in which a part of a mountain is cut out, and the flange hardware 50 is set so as to hit the cut out portion. This notched portion is set to be larger than the meandering amount. The auxiliary wife frame 62 is fixed to the mold 1 by, for example, a plurality of bolts 63. In addition, the direction of the auxiliary wife frame 62 can be any direction, and the fixing may be performed by welding or may be freely detachable.

Next, the case where the shield tunnel lining method according to the present invention is applied by applying the shield machine having the above-described configuration will be described in the order of steps with reference to FIGS.

(I) Assembling of reinforcing bars and formwork As shown in FIG. 5, with the propulsion jack 13 pulled,
The reinforcing bar U is assembled inside the inner inner tube 21b, and the mold 1 is assembled inside the reinforcing bar U into a cylindrical shape using, for example, an erector. On the other hand, the main wife frame 50 that closes the space between the inner cylinder 21 and the mold 1 together with the rebar U is
The outer end 50a is set so as to be in contact with the inner surface of the inner inner cylinder 21b, and the gap between the inner end 50b of the main wive frame 50 and the outer surface of the formwork 1 is set from the inside of the formwork 1 to the auxiliary wive frame 51. In order to resist the pressure of the lining material, a necessary number of reinforcing bars U are connected as necessary separators to the main wife frame 50 via nuts J, and the main wife frame 5 is connected thereto.
The pressure applied to zero should be provided.

As shown in FIG. 7, a flange metal member 50 is provided between the mold 1 and the inner inner cylinder 21b as a main frame 50, and the flange metal member 50 is provided in the circumferential direction of the structure. It may be embedded as a member in the footwear material. In order to oppose the pressure of the footwear material, the entire required number of reinforcing bars are connected to the flange hardware 50 as separators,
Either the pressure applied to the wife frame is provided, or a hardware for tension is provided in the wife frame to receive the pressure applied to the wife frame. This flange metal part 50 is connected to the concrete piston chamber 2.
3 attached to the inner cylinder 21b. The auxiliary wife frame 62 is set in the gap s between the flange hardware 50 and the mold 1.

At this time, as shown in FIG. 6, the propulsion jack 13 is extended until it comes into contact with the mold 1, and the propulsion jack 13 is set on the mold 1 so that the reaction force of the propulsion jack 13 can be obtained.
In order to improve the workability at the time of assembling, it is preferable that the tip of the reinforcing bar U is stopped by a locking metal 55 provided on the inner surface of the inner inner cylinder 21b.
It is preferable to integrate them in a factory or the like, because the assembling workability can be increased. In the above, in order to receive the pressure applied to the wife frames 50 and 51, a structure may be provided in which the main wife frame 50 is provided with a metal fitting for tension. The reinforcing bar U used as the separator is
The joint metal J is connected by butt midway, but as the joint metal J, a parallel joint for fixing a part of the reinforcing bar U in a wrapped state, welding or other connecting means can be used. Except for the reinforcing bar that also serves as the separator, it is to be joined by a lap joint. Further, in the above, since the outer end 50c of the main wife frame 50 is processed according to the curvature of the inner inner cylinder 21b, the outer end 50c is joined to the inner surface of the inner inner cylinder 21b to seal this portion. Although the sealing property can be secured, a sealing material may be sandwiched between the outer end 50c of the main wife frame and the inner inner cylinder 21b in order to further ensure the sealing performance.

(Ii) Step of Casting Concrete into Reinforcing Bar Assembly Room After the setting of the reinforcing bar U, the formwork 1, the main wife frame 50, the auxiliary wife frame 51, etc., the joint portion 1 of the formwork 1 through the casting pipe 2 is completed.
As shown in FIG. 8, a lining material (for example, concrete) C is poured into the reinforcing bar assembly room R surrounded by the inner cylinder 21b, the end frames 50 and 51, and the mold 1 as shown in FIG.

(Iii) Step of taking out the auxiliary wive frame As shown in FIG. 9, after the concrete is poured into the reinforcing bar assembly room R, the concrete pressure Pr in the reinforcing bar assembly room R is reduced to
When the pressure becomes almost equal to the pressure Po of the external concrete, the shutter 3 is moved in the direction of the arrow A to close the filling port of the joint 1c, and the auxiliary frame 5 at the rear of the reinforcing bar assembly room R is closed.
1 is lowered and taken out in the inner direction of the mold 1 (in the direction of arrow B). At this time, the auxiliary wife frame 51 at the rear
Out of the mold 1. By this operation, the cast concrete is always kept at the pressure. Here, in the method shown in FIG. 7, it is not necessary to take out the auxiliary wife frame 51. That is, when the cast concrete is hardened and the form 1 is dismantled, the form 1 is dismantled integrally.

(Iv) Casting Preparatory Step When the concrete is cast to the outside, the extruded pressure of the pressure holding jack 25 corresponds to the difference in the ground pressure depending on the height, and the poured concrete is always grounded. The size is set so that a pressure greater than the pressure of the mountain can be applied. The casting pipe 30 is connected to the joint portion 27 of the extrusion piston 24, and the concrete piston chamber 2 is filled through the filling port 24 a of the extrusion piston 24.
3 is set so that a lining material can be supplied. In addition, delay type concrete or the like is applied as the lining material, and the pressure is set to be transmitted backward. It is needless to say that the concrete piston chamber 23 is manufactured in advance in a factory with high precision and is formed so that the sealing member 26 can withstand high pressure.

(V) Step of Casting Concrete into Concrete Piston Chamber After completion of the concrete casting preparation, the concrete is sent from the supply pump 31 to the casting pipe 30, and the casting pipe 3
0, concrete is poured into the concrete piston chamber 23 from the filling port 24a of the extrusion piston 24. More specifically, as shown in FIG.
The concrete pressure Po generated by the action of the extrusion piston 24 is kept higher than the ground pressure Pj by adjusting the pressing force of the pressure holding jack 25 of the extrusion piston 24 provided in the concrete piston chamber 23 of 0.
Concrete is supplied from the casting pipe 30 toward the concrete piston chamber 23 at a pressure higher than the pressure of the pressure holding jack 25, and concrete is poured into the concrete piston chamber 23. At this time (when concrete is poured into the concrete piston chamber 23), the extrusion piston 24 receives a force in a direction against the pressing force of the pressure holding jack 25 due to the supply pressure of the concrete. Since the pressure holding jack 25 to be pressed is provided with a relief valve that shrinks when the jack receives a pressure greater than the set pressure, the pushing piston 24 is moved forward of the shield machine 10 together with the supply of concrete. It does not move and hinders concrete placement. When the supply of the concrete is stopped, the pressing force of the pressure holding jack 25 acts on the pushing piston 24 again, and moves backward as the shield machine 10 advances.

(Vi) Excavation Step of Shield Excavator Next, while extruding the concrete in the concrete piston chamber 23 backward, the ground is excavated by the cutter device 12 at the front end of the skin plate 11, and a reaction force is applied to the form 1. The shield excavator 10 is excavated by driving the propulsion jack 13. At this time, since the concrete pressure Po is higher than the ground pressure Pj, there is no fear of water leakage or the like.

As shown in FIG. 11, a mounting portion 70 of the pressure holding jack 25 to the shield machine 10 is provided.
The attachment part 71 to the push-out piston 24 is configured to be rotatable together. In a connecting portion 72 provided at a rear portion with respect to the traveling direction of the shield machine 10, a spherical concave portion 73 is attached to the outer cylinder 20, and a spherical convex portion 74 fitted into the spherical concave portion 73 is formed. Attached to the outer inner cylinder 21a, these spherical types are centered near the central axis of the outer cylinder 20, and make the rear part of the shield machine 10 rotatable. On the other hand, between the outer inner cylinder 21a and the outer cylinder 20, there are provided a plurality of connecting portions 80 which can be freely moved and fixed in the forward direction with respect to the traveling direction of the shield machine 10, and during the excavation of the shield machine 10. In, the distance between the inner inner cylinder 21b and the outer cylinder 20 can be freely adjusted. As a result, the double inner cylinders 21a and 21b can be freely rotated, and the shield machine 10 can be freely rotated irrespective of the position of the mold 1, and the meandering adjustment of the shield machine 10 can be performed. Even if the positions of the concrete piston chamber 23 and the shield machine 10 are relatively changed during the curve construction, no extra force is applied to the concrete piston chamber 23 itself, and the concrete pressure is reliably maintained. You can do it. After the excavation is completed, as shown in FIG. 12, the propulsion jack 13 is contracted, the reinforcing bars, the formwork, and the like are set according to the above-described procedure, and the process is repeated by repeating such steps.

It is needless to say that the pressure in the concrete piston chamber 23 is kept constant by the pressure holding jack 25 even after the excavation is completed. If it is necessary to replace the sealing member 26 of the extrusion piston 24 during the above process, after the concrete is hardened, the extrusion piston 24 is extracted from the concrete piston chamber 23, and the replacement of the sealing member 26 may be performed. This work is a simple work of extruding the extruding piston 24 using the pressure holding jack 25 after the concrete is hardened and replacing the seal member 26 on the outer periphery thereof, and since the replacement work is performed after the concrete is hardened, it is safe to perform the work on site. Can do it.

When it is necessary to clean the concrete pipe, the filling port 24a is closed using the shut-off mechanism 28 attached to the extrusion piston 24, and the casting pipe 3 is removed.
You just have to remove 0 and clean it. This operation can prevent the concrete from flowing out from the filling hole by the shut-off mechanism 28.
The work can be performed while applying pressure to the concrete inside, and the workability during tunnel lining is not impaired.

In the above embodiment, the tail portion of the shield machine 10 is doubled, a plurality of concrete piston chambers 23 are provided therein, and an extrusion piston 24 is provided in the concrete piston chamber 23.
Since the pressure in each concrete piston chamber 23 is adjusted by the pressure holding jack 25,
The concrete pressure in each room can be individually controlled in response to changes in the ground pressure (usually, the higher the depth, the higher the pressure), and the concrete pressure can always be kept higher than the ground pressure. Can be done reliably and easily.

The extruding piston 24 is moved to the rear of the shield machine 10 when extruding concrete, and is moved forward when concrete is put in the concrete piston chamber 23, and is moved forward by a relief provided on the pressure holding jack 25. When the driving pressure of the supply pump 31 becomes larger than the holding pressure by the valve, the pressure holding jack 25 contracts, so that the concrete piston chamber 2
3 can be kept almost constant even when the concrete is poured by the supply pump 31, and no excessive pressure is applied to the ground or the formwork 1 and the ground is not pushed up. There is no need to make 1 more rugged than necessary. For this reason, the concrete pressure is always
Since it is possible to keep the pressure higher than the water pressure, it is possible to prevent water leakage and to cast high-strength, high-quality concrete. Further, since the strength due to the hardening of the concrete is not required, it is possible to use the concrete having a long hardening time, and it becomes unnecessary to clean the pipes for each ring.

In the embodiment, the concrete piston chamber 23 is provided in the tail portion of the shield machine 10 and the extruding piston 24 is slidably disposed in the factory in a state where the piston 24 is sealed in the concrete piston chamber 23 in advance. The accuracy of the seal portion of the push-out piston 24 can be maintained equivalent to the seal of the movable portion such as the cutter device 12 of the shield machine 10.
Almost all the grounds where 0 can be supported can be supported.

Further, in the embodiment, since the exchange of the seal important for maintaining the pressure of the concrete can be carried out safely and easily, the exchange of the seal can be performed even when excavating over a long distance, so that the concrete pressure is always maintained. There is an advantage that holding is possible. In the embodiment, the extruding piston 24 is moved forward with the supply of the concrete, and when the concrete is extruded, the extruding piston 24 is moved to the rear of the shield machine 10. Therefore, the pressure in the concrete piston chamber 23 is reduced. It is possible to keep the concrete almost constant during the supply of the concrete. As a result, there is no need to apply excessive pressure to the ground or the formwork 1, to push up the ground, and to make the formwork 1 unnecessary. This has the effect of eliminating the need for sturdiness.

A mounting portion 70 of the pressure holding jack 25 to the shield machine 10 is formed by a universal joint so as to be rotatable, and a mounting portion 71 to the pushing piston 24 is provided.
Are rotatably formed by pins and have a structure that can rotate together. A connecting portion 72 is provided at the rear portion in the traveling direction of the shield excavator 10 so as to be integrally connected in a ring shape as a whole. The connecting portion 72 has a spherical shape attached to the rear end of the outer cylinder 20. A spherical projection 74 fitted into the recess 73 is attached to the rear end of the outer inner cylinder 21a. For the curvature of the spherical concave portion 73 and the convex portion 74, a part of a spherical type having substantially the same radius is used. This spherical type is centered near the central axis of the outer cylinder 20 and has a radial length outside. It is larger than the radial length of the inner cylinder 21b and smaller than the radial length of the outer cylinder 20. For this reason, the whole rear part of the shield machine 10 is rotatable. On the other hand, between the tip of the inner inner cylinder 21b and the outer cylinder 20, there are provided a plurality of connection portions 80 which can be freely moved and fixed in the forward direction with respect to the traveling direction of the shield machine 10, so that double connection is provided. The inner cylinders 21a and 21b can be freely moved, and the shield machine 10 can be freely moved irrespective of the installation position of the formwork 1.
During excavation, the distance between the inner inner cylinder 21b and the outer cylinder 20 can be freely adjusted. By this, meandering adjustment can be performed by rotating the rear part of the shield machine 10 and moving the front part thereof, and even if the positions of the concrete piston chamber 23 and the shield machine 10 fluctuate relatively during curve construction. Thus, it is possible to reliably maintain the pressure of the concrete without giving an extra force to the concrete piston chamber 23 itself.

Also, in the embodiment, the pressure in the concrete piston chamber 23 can be always maintained higher than the earth pressure and water pressure of the ground. This method has the advantage that it is possible to cast the ground and that the tail void can be reliably filled, so that there is no danger of land subsidence. Furthermore, in the embodiment, since the extrusion piston 24 is configured to always press the concrete,
There is also an effect that it is possible to use concrete having a long hardening time, and it becomes unnecessary to clean pipes for each ring. Further, in the embodiment, since the reinforcing bar U is attached to the wife frame and used as a separator, the jack of the wife frame becomes unnecessary, and when the jack is provided in the wife frame, it can be removed as necessary. There is an advantage that it becomes.

In the method 1, the space between the inner cylinder 21 and the mold frame 1 is closed by the main wife frame 50 and the auxiliary wife frame 51 joined to the main wife frame 50, and the appearance of the auxiliary wife frame 51 is adjusted. Thus, since the meandering of the shield machine 10 is adjusted, there is an advantage that workability can be improved. Thus, when the wife frame holder 60 is used, there is an effect that the internal reinforcing bar U can be joined by the lap joint.

The casting of the lining material is performed by a supply pump 31 for the lining material, and the concrete and the like extruded by the supply pump 31 are divided by a branch valve 33 to enter each concrete piston chamber 23. Can be cast into each concrete piston chamber 23, and
It is possible to move the pushing piston 24 freely. A blocking mechanism 28 is provided in the filling hole 24a of the concrete piston chamber 23, and the work can be performed while maintaining the pressure of the concrete, so that the workability can be improved. The joint 27 of the casting pipe 30 is provided in front of the shut-off mechanism 28, so that the pipe can be cleaned safely.

On the other hand, the use of the flange hardware 50 eliminates the need for the jack of the auxiliary wive frame 51, and when the jack is provided, it can be removed when necessary.
In the flange hardware 50, the curvature of the outer periphery is adjusted by
By processing in accordance with the curvature of the inner circumference of b, there is almost no space between the flange hardware 50 and the inner inner cylinder 21b, so that the footwear material does not leak and pressure can be maintained. Further, since the gap s larger than the meandering amount is provided between the flange hardware 50 and the formwork 1, the meandering of the shield machine 10 can be easily corrected.

[0050]

As described above, according to the shield tunneling machine and the method for mounting a shield tunnel of the present invention, the following excellent effects can be obtained. According to the shield machine of the first aspect, since the concrete piston chamber is provided by forming the partition wall, a plurality of concrete piston chambers can be manufactured in advance in a factory or the like. For this reason, the concrete piston chamber can be manufactured with high precision, and after the footwear material has hardened,
The extrusion piston can be safely removed from the concrete piston chamber, and the replacement of the seal can be facilitated. In the connection portion provided at the rear portion in the traveling direction of the shield machine, a spherical convex portion is provided on the outer surface of the outer inner cylinder, and a spherical concave portion for fitting the spherical convex portion is provided on the inner surface of the outer cylinder. Therefore, the connecting portion can be freely rotated. For this reason, the meandering adjustment of the shield excavator can be performed, and even if the position of the piston chamber and the shield excavator relatively fluctuate at the time of curve construction, it does not give extra force to the concrete piston chamber itself, and The pressure can be reliably maintained.

In the shield machine according to the second aspect, the same effect as in the first embodiment is provided, and a plurality of connecting portions are provided at a rear portion with respect to the traveling direction of the shield machine, and the connecting portion has an outer portion. Since the spherical projection fitted to the spherical recess attached to the rear end of the cylinder is attached to the rear end of the outer inner cylinder, the entire rear part of the shield machine is rotatable. On the other hand, between the inner cylinder and the outer cylinder, a plurality of connection portions that can be freely moved and fixed in the forward direction with respect to the traveling direction of the shield machine are provided, and during excavation of the shield machine,
The distance between the inner cylinder and the outer cylinder can be freely adjusted.
This rotates the rear part of the shield machine,
By moving the front part, meandering can be adjusted, and even if the position of each room and the shield excavator relatively fluctuate at the time of curve construction, without giving extra force to each room itself, concrete Can be reliably maintained.

According to the third aspect of the present invention, the pressure of the extruding pistons in the plurality of concrete piston chambers formed in the tail portion is individually controlled by the pressure holding jacks, so that the lining material is removed. Since the supply pressure is higher than the earth pressure and the water pressure of the ground, and the spacing between the inner cylinder and the formwork is kept constant, the material is poured in. Since the pressure of the material in the piston chamber can be individually controlled, it is possible to easily cope with the difference in the ground pressure due to the height, the filling of the material into the tail void is ensured, There is no fear. Then, when the supply pressure of the footwear material becomes larger than the set holding pressure of the pressure holding jack, the supply pressure of the footwear material causes the extruding piston to move forward of the shield machine, The extruding piston moves to the rear of the shield machine when pushing out the work material and forward when putting the work material in the piston chamber, so that the pressure in the concrete piston chamber can be kept almost constant even when the work material is supplied. It becomes possible. Therefore, the pressure can be sufficiently maintained, and the pressure can be reliably prevented from lowering.
There is no water leakage, high-strength high-quality lining material can be cast, and the construction of shield tunnels can be performed quickly and safely, without applying excessive pressure to the ground or formwork. It does not push up the ground and eliminates the need to make the formwork more rigid than necessary. In addition, when assembling the rebar, the main wife frame is arranged in contact with the inner surface of the inner cylinder of the shield machine, and the auxiliary wife frame is projected from the inside of the mold to this main wife frame, and the form and the shield machine are Even if the size of the gap between the inner cylinder and the outer periphery of the mold changes due to the meandering of the shield machine, by adjusting the length of the auxiliary end frame, It can cope with meandering, and can reliably maintain the pressure of the footwear material.

According to the construction method of the shield tunnel according to the fourth aspect, in addition to the effect of the third aspect, a plurality of connecting portions which can be freely moved and fixed forward in the traveling direction of the shield machine are provided. Because it is provided, it is possible to adjust the meandering of the shield excavator, even if the position of the piston chamber and the shield excavator relatively fluctuates during curve construction, without giving extra force to the piston chamber itself, Concrete pressure can be reliably maintained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a tunnel showing a state in which a shield machine is excavating a ground in an embodiment of a method for lining a shield tunnel according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a side sectional view of the shield machine according to the present invention.

FIG. 5 is a process diagram showing an assembling process of a reinforcing bar and a formwork in the method of manufacturing a shield tunnel according to the present invention.

6 is a process diagram when the propulsion jack of FIG. 5 is extended.

FIG. 7 is a side sectional view when a flange hardware is used in FIG. 5;

FIG. 8 is a process diagram showing a process of placing concrete in a reinforcing bar assembly room.

FIG. 9 is a drawing illustrating a removal process of an auxiliary wife frame.

FIG. 10 is a process chart showing a process of placing concrete in a concrete piston chamber.

FIG. 11 is a side sectional view showing a rotating state of the shield machine.

FIG. 12 is a side sectional view of the shield machine after excavation is completed.

[Explanation of symbols]

 T Tunnel 1 Formwork 10 Shield machine 11 Skin plate 12 Cutter device 13 Propulsion jack 20 Outer cylinder 21a / 21b Outer / inner cylinder 22 Partition wall 23 Concrete piston chamber 24 Extrusion piston 25 Pressure holding jack 50 Main wife frame 51 Auxiliary wife frame 72 Connection part 73 Spherical concave part 74 Spherical convex part 80 Connection part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fusao Kawakami 1-3-2 Shibaura, Minato-ku, Tokyo Inside Shimizu Corporation (72) Inventor Yasuhiko Shigeta 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Masayuki Otsuka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Taikichi Arato 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu (72) Inventor Minoru Imai 2-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Toru Kawai 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation In-company (56) References JP-A-2-217599 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/10 E21D 9/06 301

Claims (4)

(57) [Claims] 1. A cylindrical skin plate forming an outer shell,
A cutter device that is rotated by driving means provided at the front end of the skin plate to excavate the ground and a propulsion jack whose base end is connected to a partition plate formed inside the skin plate are provided. In a shield machine, a tail portion of a skin plate is formed by an outer cylinder and an inner cylinder, and the inner cylinder is formed in a double form, and a rotatable connection is formed between the outer cylinder and the inner cylinder of the tail section. Part is provided at the rear part in the traveling direction of the shield machine, at the connection part, a spherical convex part is provided on the outer surface of the outer inner cylinder, and a spherical concave part for fitting the spherical convex part is provided on the inner surface of the outer cylinder. A plurality of concrete piston chambers are provided between the double inner cylinders to form a plurality of partition walls extending in the radial direction of the skin plate and accommodate the extruding piston, and the inner inner cylinder has no relation to the movement of the shield machine. Freely formwork dismantling and moving is provided a shield machine, characterized in that the shield jacks for the reaction force promoting mold frame is provided. 2. The shield machine according to claim 1, wherein a plurality of connecting portions that are movable and fixed to a front portion with respect to a traveling direction of the shield machine are provided between the inner cylinder and the outer cylinder. A shield machine which is provided. 3. The peripheral wall of a tunnel excavated while excavating the ground by a cutter device at the tip of the shield machine according to claim 1, is covered with a form at a predetermined interval, and the form, the peripheral wall and A method of placing a reinforcing tunnel between the inner tube and the inner side of the inner tube, wherein a reinforcing material is provided between the inner tube and the supplying material, and the inner surface of the tunnel is provided. When assembling the formwork, set the main wife frame that closes between the inner cylinder and the formwork together with the arrangement of the rebar, so that the outer end of the main frame is in contact with the inner surface of the inner cylinder, and reduce the concrete pressure applied to the wife frame. After serving as a separator by connecting the reinforcing bars, the gap between the inner end of the main wive frame and the outer surface of the mold is closed by projecting the auxiliary wive from the inside of the mold. , Mold frame, wife frame While the footwear material is poured into the reinforcing bar assembly room, the footwear material is poured from the concrete piston room between the formwork and the ground, and the pressure of the footwear material in the reinforcing bar assembly room and the external footing material are reduced. At the time when the pressure is equal, take out the rear auxiliary frame at the rear, integrate the footing material inside the reinforcing bar assembly room with the outside footing material, and press the extrusion piston in the concrete piston chamber with the pressure holding jack to reduce the pressure of the footing material. When the shield excavator digs in a direction different from the axis of the crawler formwork during construction of a curved section, etc., while pressing so as to be higher than the earth pressure and water pressure of the ground, the outer cylinder and the inner cylinder With the rotatable connection provided between
A method for constructing a shield tunnel, wherein concrete is poured and a shield excavator is excavated while keeping a constant distance between an inner cylinder and a formwork, regardless of the excavation direction of the shield excavator. 4. A rebar is arranged inside the inner cylinder of the tail portion of the shield machine according to claim 2, and when the form is assembled inside the rebar, the rebar is arranged, and the inner cylinder and the form are formed. The main wife frame that closes the gap between the main frame and the outer end thereof is set so as to be in contact with the inner surface of the inner cylinder, and the concrete pressure applied to the wife frame is connected as a separator instead of a reinforcing bar by connecting a reinforcing bar. After closing the gap between the inside edge of the mold and the outer surface of the formwork by projecting the auxiliary wive frame from the inside of the formwork, work is performed on the rebar assembly room surrounded by the inner cylinder, the formwork, and the formwork. While the material is being poured, the material is poured from the concrete piston chamber between the formwork and the ground, and the pressure holding jack pushes the extruding piston in the concrete piston chamber to reduce the pressure of the material from the earth pressure of other mountains. , Press to a pressure higher than the water pressure Meanwhile, when the shield machine excavates in a direction different from the axis of the work form during construction of a curve section, etc., between the outer cylinder and the inner cylinder of the tail part, The provided rotatable connection portion, the outer inner tube, and the outer tube, by a plurality of freely movable / fixed connection portions provided at the front portion with respect to the traveling direction of the shield machine, A method for constructing a shield tunnel, wherein concrete is poured while a gap between a shield machine during excavation and a formwork is controlled, and a shield excavator is excavated.