JP2936236B2 - Lining method of shield tunnel - Google Patents

Description

The present invention relates to a method for lining a shield tunnel, and more particularly to a method for lining a shield tunnel with a lining material such as cast-in-place concrete. Shield tunnel lining method.

"Conventional technology" In a lining method in a shield tunnel, a lining method using cast-in-place concrete generally uses a shield machine having a cylindrical outer shape and excavates the ground with a cutter device provided in front of the shield machine. The surrounding wall of the excavated tunnel is covered with a formwork at a predetermined interval, a reinforcing bar is arranged between the formwork and the surrounding wall, concrete is cast, and the concrete is pressed by the operation of the pressing jack. And the process of moving the entire shield machine forward.

By the way, in such a construction method, the end frame of the pressing jack is provided with the end frame ring so as to close the space between the formwork and the tunnel peripheral wall, but conventionally, the end frame ring is attached to the rod of the pressing jack. Because of the accompanying movement, curing of the concrete is required until the strength of the concrete is developed, and there has been a problem that the construction time is prolonged.

Therefore, as a means for solving such a problem, the prior art includes an annular pressure holding ring that takes a reaction force into the cast-in-place concrete and holds the compression of the concrete,
There is disclosed a means of disposing between the formwork and the tunnel peripheral wall while being held by a tie rod and embedding it in a lining material (Japanese Patent Laid-Open No. 1-1900900 "cast-in-place shield excavator").

"Problems to be Solved by the Invention" 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.

Second, since there is no pressure maintaining device for keeping the concrete pressure always higher than the ground pressure, even if the pressure can be maintained at first, the pressure gradually decreases.

The present invention has been proposed in view of the above circumstances, and the purpose thereof is to always maintain the pressure of the lining material at the earth pressure of the ground.
It is an object of the present invention to provide a shield tunnel lining method capable of assembling reinforcing steel and placing concrete while maintaining the pressure higher than water pressure, and capable of performing high-quality lining.

Means for Solving the Problems In order to achieve the above object, the present invention covers the excavated peripheral wall of a tunnel excavated at a predetermined interval by a formwork while excavating the ground with a cutter device at the tip of a shield machine. ,
A lining method for a shield tunnel in which a reinforcing bar is provided between the formwork and the peripheral wall and a lining material is supplied to lining the inner surface of the tunnel. , A plurality of concrete piston chambers formed by an outer cylinder and an inner cylinder, and a plurality of partition walls extending in the radial direction of the skin plate formed between the outer cylinder and the inner cylinder of the tail portion to accommodate an extruded piston. Is provided, and a reinforcing bar is arranged inside the inner cylinder, and when assembling the formwork inside the reinforcing bar, the main wife frame that closes between the inner cylinder and the formwork together with the arrangement of the reinforcing bar is provided on the outside thereof. Along with the end set to be in contact with the inner surface of the inner cylinder, the concrete pressure applied to the end frame is received as a substitute for the separator by connecting a reinforcing bar, and the gap between the inner end of the main end frame and the outer surface of the formwork is provided. After projecting and closing the auxiliary wive frame from the inside of the formwork, a lining material is poured into a rebar assembly room surrounded by the inner cylinder, the formwork and the wive frame, and the lining material of the rebar assembly room is formed. When the pressure of the outside becomes approximately equal to the pressure of the external lining material previously cast between the formwork and the ground from the concrete piston chamber, the auxiliary frame at the rear is taken out and the inside of the reinforced assembly room is covered. The extruding piston in the concrete piston chamber is pressed by a pressure holding jack so that the pressure of the lining material becomes higher than the earth pressure and the water pressure of the ground. The present invention is characterized in that a lining material is newly poured into the piston chamber, and then the shield machine is dug.

Further, in order to achieve the same object, the present invention provides a method for lining a shield tunnel, wherein when the supply pressure of the lining material becomes larger than a set holding pressure of a pressure holding jack, the supply pressure of the lining material is increased. Thus, the pushing piston is moved forward of the shield machine.

According to the shield tunnel lining method of the present invention,
By controlling the pressures of the extruding pistons in the plurality of concrete piston chambers formed in the tail section by the pressure holding jacks, the pressure of the lining material in each chamber can be individually controlled. It is possible to easily cope with the difference in the mountain pressure, and it is possible to always keep the pressure of the lining material higher than the earth pressure and water pressure of the ground.
Further, by such an operation, the tail void is reliably filled with the lining material, and there is no possibility of sinking.

Also, when assembling the rebar, a main wife frame is placed 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 continuously from the inside of the formwork, and the formwork and the shield machine are connected. 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 wive frame, It is possible to cope with the meandering and to reliably maintain the pressure of the lining material.

Further, when the supply pressure of the lining material is greater than the set holding pressure of the pressure holding jack, the extrusion piston is moved forward of the shield machine by the supply pressure of the lining material. The piston moves to the rear of the shield machine when pushing out the lining material and moves forward when putting the lining material into the piston chamber, so that the pressure in the concrete piston chamber can be kept almost constant even when supplying the lining material. Become.

Hereinafter, embodiments of the present invention will be described 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, which is formed behind the shield machine 10 while excavating a tunnel T to the left with respect to the paper surface by a cutter device 12 provided at the front thereof. Tunnel T
Is covered with a mold 1 at a predetermined interval, and a reinforcing bar U is arranged between the mold 1 and the peripheral wall.
The lining material is supplied, and the lining wall W is constructed 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. Further, the face plate 1a of some of the molds (upper mold) has an outer side of the mold. A joint portion 1c for connecting a casting pipe 2 for casting a lining material is provided, and a storage groove 1d for storing an auxiliary wife frame 51 to be described later is provided so as to be freely retractable. The joint 1c is provided with a shutter mechanism 3 for opening and closing the filling port of the joint 1c (see FIG. 4).

Next, a shield machine for performing the tunnel lining method according to the present invention will be described in more detail. The shield machine includes a cylindrical skin plate 11 serving as an outer shell, and a front end portion of the skin plate 11. Cutter device 12 for excavating the ground by being provided and rotated by driving means (not shown)
And a propulsion jack 13 having a base end connected to a partition plate 11a formed inside the skin plate 11.

The tail of the skin plate 11 is a skin plate
An outer cylinder 20 having the same diameter as 11 and constituting a part of the skin plate 11
And an inner cylinder 21 having a diameter smaller than that of the outer cylinder 20. The outer cylinder 20 and the inner cylinder 21 are, as shown in FIG. 2 and FIG. 11 are connected by a plurality of partitions 22 extending in the radial direction. Further, between the outer cylinder 20 and the inner cylinder 21, a plurality (4 in the illustrated example)
A concrete piston chamber 23 is provided, and an extrusion piston 24 is slidably housed in each concrete piston chamber 23.

As shown in detail in FIGS. 2 to 4, the extrusion piston 24 is formed in a size that fits tightly in the concrete piston chamber 23 in accordance with the internal shape of the concrete piston chamber 23, and A plurality of pressure holding jacks 25 each having a proximal end attached to 11a are configured to slide back and forth.

The pressure holding jack 25 for operating the push-out piston 24 is provided with a relief valve so that the jack contracts when the laying pressure of the lining material becomes larger than the holding pressure of the jack. Has become.

A plurality of (two in this embodiment) seal members 26 are attached to the outer periphery of the push-out piston 24,
A filling hole 24a of a lining material is formed in the center of the extrusion piston 24 to communicate the inside of the skin plate 11 and the inside of the concrete piston chamber 23.
On the inner surface, there is provided a joint portion 27 which communicates with the filling hole 24a and is connected to the casting pipe 30 of the lining material (see FIG. 4).

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 is provided with a blocking mechanism 28 for opening and closing the filling hole 24a (see FIG. 4).
24a can be opened and closed. In addition,
The blocking mechanism 28 is specifically composed of a shutter, a valve, and the like, but may have another configuration as long as it can open and close the filling hole 24a.

In FIG. 1, reference numeral 30 denotes a casting pipe for the lining material, and the casting pipe 30 has one end connected to a branch valve 33 connected to a supply pipe 32 of a supply pump 31 for the lining material. The casting pipe itself is formed of a flexible pipe or a telescopic pipe so that it can cope with the movement of the pushing piston 24.

Further, in the drawing, reference numeral 50 denotes a main wife frame that closes the space between the inner cylinder 21 and the mold 1, and the main wife frame 50 has a curvature of the inner surface of the inner cylinder 21 as shown in FIG. Multiple correspondingly curved plates
The basic configuration is such that 50a is combined in a ring shape in the longitudinal direction.

Further, the inner end 50b of the main wife frame 50 is processed so as to be concentric with the outer end thereof, and the inner end 50b
G is changed by the meandering of the shield machine, so the size of the gap is set to be larger than the meandering amount, and the main wife frame 50 is exposed inside the lining material. It goes without saying that care has been taken not to do so.

An auxiliary wife frame 51 for closing the gap is set in the gap between the mold frame 1 and the main wife frame 50.

A notch 51b (see FIG. 5) that fits into the main wife frame 50 is provided at the outer end of the auxiliary wife frame 51. When the main wife frame 50 is set, the notch 51b is fitted to cover the main wife frame 50. The casting pressure of the working material can be transmitted to the main wife frame 50. Further, the auxiliary wife frame 51 may be attached by directly bolting to the formwork, or may be pressed from inside. By the way, this auxiliary wife frame 51 also basically forms a ring by combining a plurality of plate bodies 51a in the circumferential direction, similarly to the main wife frame 50. A tapered surface is formed at the joint of the four plate bodies 51a, so that the auxiliary wife frame 51 can be assembled in a ring shape from the inside of the inner cylinder 21 (see FIG. 2).

Next, a case of applying the shield tunnel lining method according to the present invention by applying the shield machine configured as described above will be described in the order of steps with reference to FIGS.

(I) Reinforcing Bar and Formwork As shown in FIG. 4, a reinforcing bar U is assembled inside the inner cylinder 21 with the propulsion jack 13 pulled, and an erector is used inside the reinforcing bar U, for example. The mold 1 is assembled into a cylindrical shape. On the other hand, the main wive frame 50 for closing the space between the inner cylinder 21 and the mold 1 together with the assembly of the rebar U is set so that the outer end 50a thereof is in contact with the inner surface of the inner cylinder 21. The gap between the end 50b and the outer surface of the mold 1 is
In order to protrude and close the auxiliary wife frame 51 from the inside of the formwork 1, the main wife frame 50 has a
The necessary number of reinforcing bars U are connected via nuts J as separators, and this is to receive the pressure applied to the main wife frame 50.

At this time, the propulsion jack 13 is extended until the propulsion jack 13 comes into contact with the formwork 1 and is set on the formwork 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 distal end be stopped by a locking metal 55 provided on the inner surface of the inner cylinder 21. In addition, if the main wife frame 50 and the reinforcing bar U are integrated at a factory or the like, assembly workability can be increased. Because it is possible, it is desirable.

Note that, in the above, in order to receive the pressure applied to the wife frames 50, 51, a structure may be provided in which the main wife frame 50 is provided with a metal fitting for tension. The reinforcing bars U used as the separators are connected by joining metal joints J in the middle, but as the joint metal J, a parallel joint for fixing a part of the reinforcing bars U in a wrapped state, welding or other connection is used. Means and the like can be used, and further, except for the reinforcing steel that also serves as the separator, it is to be joined by a lap joint.

In the above description, the outer end 50c of the main wife frame 50 is
The outer edge 50c
By joining the inner surface of the inner cylinder 21, the hermeticity of this portion can be ensured, but in order to further ensure the hermeticity, the sealing material is formed between the outer end 50c of the main frame and the inner cylinder 21. You may put it in between.

(Ii) Casting concrete into the rebar assembling room After completing the setting of the reinforcing bar U, the formwork 1, the main wife frame 50, the auxiliary wife frame 51, etc., the lining material from the joint 1c of the formwork 1 through the casting pipe 2. As shown in FIG. 6, a concrete (for example, concrete) C is cast into a reinforcing bar assembly room R surrounded by the inner cylinder 21, the end frames 50 and 51, and the formwork 1.

(Iii) Removal of the auxiliary wife frame As shown in FIG. 7, after the concrete is poured into the reinforcing bar assembly room R, the concrete pressure Pr of the reinforcing bar assembly room R is increased.
However, when the pressure becomes almost the same as the pressure Po of the external concrete, the auxiliary wife frame 51 at the rear of the reinforcing bar assembly room R is taken out inward of the formwork 1 as shown in FIG. Close the filling port. By this operation, the cast concrete is always kept at the pressure.

(Iv) Preparation for placing concrete When placing concrete outside,
The extruding pressure of the pressure holding jack 25 is set to correspond to the difference in the ground pressure depending on the height, and the size is set so that the poured concrete can always apply a pressure greater than the pressure of the ground. The casting pipe 30 is connected to the joint portion 27 of the piston 24, and is set so that the lining material can be supplied into the concrete piston chamber 23 through the filling port 24a of the extrusion piston 24. 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 the sealing member 26 is formed so as to withstand high pressure.

(V) Casting concrete into the concrete piston chamber After the preparation for casting concrete is completed, the concrete is sent from the supply pump 31 to the casting pipe 30 and the concrete is extruded through the filling port 24a of the piston 24 through the casting pipe 30. Placed in piston chamber 23.

More specifically, by adjusting the pressing force of the pressure holding jack 25 of the extrusion piston 24 provided in the concrete piston chamber 23 of the shield machine 10, the concrete pressure Po generated by the action of the extrusion piston 24 is calculated from the ground pressure Pj. To the concrete piston chamber 23 from the casting pipe 30 at a pressure higher than the pressure of the pressure holding jack 25.
Concrete will be poured into 23.

At this time (when the concrete is poured into the concrete piston chamber 23), the extruding piston 24 receives a force in the direction opposite to 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 the jack when it receives a pressure greater than the set pressure, the extrusion piston 24 moves forward of the shield machine 10 with the supply of concrete. Therefore, the placement of concrete is not hindered. When the supply of concrete stops, 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 of the shield machine Next, while extruding the concrete in the concrete piston chamber 23 backward, the ground is excavated with the cutter device 12 at the front end of the skin plate 11, and the propulsion jack 13 is taken by taking a reaction force on the formwork 1. The shield machine 10 is excavated by being driven. At this time, since the concrete pressure Po is higher than the ground pressure Pj, there is no risk of water leakage or the like.

After the excavation is completed, as shown in FIG. 9, the propulsion jack 13 is contracted, a reinforcing bar, a formwork, and the like are set according to the above-described procedure, and the work is advanced by repeating such steps.

Needless to say, the pressure in the concrete piston chamber 23 is kept constant by the pressure holding jack 25 even after the excavation is completed.

During the above process, the sealing member 26 of the pushing piston 24 is
If it is necessary to replace the sealing member 26, the extruding piston 24 may be extracted from the concrete piston chamber 23 after the concrete has hardened, and the sealing member 26 may be replaced. This operation is a simple operation of extracting 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. Can do it.

Further, when it is necessary to clean the concrete pipe, the filling port 24a may be closed using the blocking mechanism 28 attached to the extrusion piston 24, the casting pipe 30 may be removed, and the concrete pipe may be cleaned. Since this operation can prevent the concrete from flowing out from the filling hole by the blocking mechanism 28, it can be performed while applying pressure to the concrete in the concrete piston chamber 23, and the workability at the time of tunnel lining is improved. There is no loss.

In the above embodiment, the tail part of the shield machine 10 is doubled, a plurality of concrete piston chambers 23 are provided therein, and an extruding piston is inserted into the concrete piston chamber 23.
24, and press this extrusion piston 24 into a pressure holding jack.
25, the pressure in each concrete piston chamber 23 is adjusted, so that the concrete pressure in each chamber is managed in response to changes in ground pressure (normally, the higher the depth, the higher the pressure). It can be carried out individually and it is possible to reliably and easily maintain the concrete pressure always higher than the ground pressure.

Further, in the embodiment, a concrete piston chamber 23 is provided in the tail portion of the shield machine, and in a factory,
Since the extruding piston 24 is slidably disposed in the concrete piston chamber 23 in a sealed state, the accuracy of the sealing portion of the extruding piston 24 can be maintained at the same level as the seal of a movable portion such as a cutter of a shield machine. Almost all the ground that can be used by shield machines can be handled.

Further, in the embodiment, since the exchange of the seal important for maintaining the pressure of the concrete can be performed safely and easily, it is possible to always maintain the concrete pressure by exchanging the seal even during long excavation. There is an advantage that it is.

Further, in the embodiment, with the supply of concrete, the extruding piston 24 is moved forward, and when extruding the concrete, it is moved behind the shield machine. Can be kept almost constant, and as a result, without applying excessive pressure to the ground and formwork,
This has the effect of not pushing up the ground and eliminating the need to make the formwork more rigid than necessary.

According to the above, in the embodiment, the pressure in the concrete piston chamber 23 can always be kept higher than the earth pressure and water pressure of the ground, so that there is no water leakage and high-strength high-quality concrete is poured. Is possible.
In addition, since the tail void can be reliably filled, there is an advantage that there is no possibility of land subsidence.

Further, in an embodiment, the extrusion piston 24 always
Since it is configured to press concrete, it is possible to use concrete having a long hardening time, and there is also an effect that cleaning of piping and the like for each ring becomes unnecessary.

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 embodiment, a main wife frame 50 is provided between the inner cylinder 21 and the mold 1.
By closing the auxiliary wife frame 51 joined to the main wife frame 50 and adjusting the emergence of the auxiliary wife frame 51 to adjust the meandering of the shield machine, there is an advantage that workability can be improved. is there.

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.

“Effects of the Invention” As described above, according to the present invention, the following excellent effects can be obtained.

(1) A method for lining a shield tunnel according to claim 1, wherein the peripheral wall of the tunnel excavated is covered with a form at a predetermined interval while excavating the ground with a cutter device at the tip of the shield machine. A lining method for a shield tunnel in which a reinforcing material is arranged between the peripheral wall and a lining material is supplied to lining the inner surface of the tunnel, wherein a tail portion of a skin plate of the shielding machine is provided with an outer cylinder. A plurality of concrete piston chambers for accommodating the extruding piston are formed by forming a plurality of partitions extending in the radial direction of the skin plate between the outer cylinder and the inner cylinder of the tail portion, while forming a double with the inner cylinder. When arranging a reinforcing bar inside the inner cylinder and assembling the formwork inside the reinforcing bar, the main end frame that closes between the inner cylinder and the formwork together with the arrangement of the reinforcing bar, the outer end of which is the inner cylinder Contact the inside of While setting so that the concrete pressure applied to the wife frame is received as a substitute for the separator by connecting the reinforcing bars, 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. After projecting and closing the auxiliary wife frame, a lining material is poured into a reinforcing bar assembly room surrounded by the inner cylinder, the mold frame, and the wife frame, and the pressure of the lining material in the reinforcing bar assembly room is increased by the concrete piston chamber. When the pressure becomes approximately equal to the pressure of the external lining material previously cast between the formwork and the ground, the rear auxiliary frame is taken out and the lining material in the reinforcing bar assembly room and the external lining are removed. The lining material is integrated into the concrete piston chamber while the extruding piston in the concrete piston chamber is pressed by the pressure holding jack so that the pressure of the lining material becomes higher than the earth pressure and the water pressure of the ground. Newly hit Then, the shield machine is dug after that, so that the pressure can be sufficiently maintained and the pressure can be reliably prevented from lowering. It has an excellent effect that high quality lining material can be cast.

Further, according to the above, there is an effect that the construction of the shield tunnel can be performed quickly and safely.

(2) The method for lining a shield tunnel according to claim 2 is as follows.
In the shield tunnel lining method, when the supply pressure of the lining material becomes larger than the set holding pressure of the pressure holding jack, the supply pressure of the lining material causes the extrusion piston to move to the front of the shield machine. Since it is a feature, the same effect as above can be obtained,
In addition, the pressure of the lining material in the concrete piston chamber can be kept almost constant even when the lining material is supplied, and the ground can be pushed up without applying excessive pressure to the ground and formwork. There is also an effect that there is no need to make the formwork more rigid than necessary.

[Brief description of the drawings]

The drawings show an embodiment of the method for lining a shield tunnel of the present invention. FIG. 1 is a side sectional view of a tunnel showing a state in which a shield machine is excavating the ground, and FIG. Figure
FIG. 3 is a sectional view taken along the line II-II, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIGS. 4 to 9 are shown for specifically explaining the method of the present invention. It is a process drawing. T ... tunnel, 1 ... form, 10 ... shield machine, 11 ...
... Skin plate, 12 ... Cutter device, 13 ... Propulsion jack, 22 ... Partition wall, 23 ... Concrete piston chamber,
24 …… Extrusion piston, 25 …… Pressure holding jack, 50…
… Main wife frame, 51… Auxiliary wife frame.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taikichi Arato 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Toru Goto 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction (72) Inventor Masayuki Otsuka 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (56) References JP-A-2-132296 (JP, A) (58) Fields surveyed (Int .Cl. ⁶ , DB name) E21D 11/10 E21D 9/06 301

Claims (2)

(57) [Claims] An excavated tunnel is covered with a formwork at a predetermined interval while excavating the ground by a cutter device at a tip end of a shield machine, and a reinforcing bar is disposed between the formwork and the surrounding wall. A method for lining a shield tunnel, in which a lining material is supplied together with the inner surface of the tunnel, wherein a tail portion of a skin plate of the shield machine is formed by an outer cylinder and an inner cylinder. A plurality of concrete piston chambers are provided between the outer cylinder and the inner cylinder of the tail portion, the plurality of partition walls extending in the radial direction of the skin plate being formed, and a plurality of concrete piston chambers for accommodating the extrusion piston are provided, and a reinforcing bar is arranged inside the inner cylinder. Then, when assembling the formwork inside the rebar, while setting the main wife frame that closes between the inner cylinder and the formwork with the arrangement of the rebar, the outer end is set so that it contacts the inner surface of the inner cylinder, Wife frame After the concrete pressure is received as a substitute for the separator by connecting the reinforcing bars, the gap between the inner end of the main frame and the outer surface of the frame is closed by projecting the auxiliary frame from the inside of the frame. A lining material is poured into a reinforcing bar assembly room surrounded by an inner cylinder, a formwork, and a bobbin frame, and the pressure of the lining material in the reinforcing bar assembly room is set between the concrete piston room and the formwork and ground. At the point when the pressure of the external lining material that has been cast is substantially equal to that of the external lining material, the auxiliary frame at the rear is taken out, and the lining material in the reinforcing bar assembly room and the external lining material are integrated. By pushing the extrusion piston in the concrete piston chamber so that the pressure of the lining material becomes higher than the earth pressure of the ground and the water pressure, a new lining material is poured into the concrete piston chamber, and then the shield is applied. Digging the machine A method for lining a shield tunnel, characterized in that: 2. The method according to claim 1, wherein when the supply pressure of the lining material is larger than a set holding pressure of the pressure holding jack, the pushing piston is moved by the supply pressure of the lining material. A method for lining a shield tunnel, comprising moving the shield tunnel forward.