JP2000170497A - Tunnel excavating/lining construction method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tunnel excavating/lining construction method and a device therefor being easy in the replacement of an excavator and a lining form in a tunnel performed between an excavating process and a lining process of the tunnel, requiring no exclusive equipment such as a form carrying rail, capable of shortening required time between the excavating process and the lining process and capable of reducing labor and a cost. SOLUTION: After an excavating process by a free cross section excavator 1, a portable NTL form 2 is carried up to a working face by this free cross section excavator 1 to be expanded/fixed to perform a lining process by placing concrete between the working face and natural ground, and after hardening the concrete, the portable NTL form 2 is contracted to be separated from a mold, and a process of carrying this up to a rear retreat position by the free cross section excavator 1 is repeated so as to obviate carrying exclusive equipment of the portable NTL form 2 as well as to easily replace the excavator 1 and the portable NTL form 2 in a tunnel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavation / lining method and a tunnel excavation / lining apparatus used in the method.

[0002]

2. Description of the Related Art When excavating a tunnel, if the bedrock is relatively soft, it is necessary to excavate a tunnel of a required section by a mechanical excavation method and then immediately cover the ground with concrete. Conventionally, as such a tunnel lining method, a concrete spraying method using NATM and a method called NTL method are known.

[0003] In the construction method by NATM, a tunnel is excavated to carry out the shear, and at the same time, a rapidly setting concrete is sprayed onto a surface of the excavated ground by a concrete spraying machine or the like to perform primary lining. It is a construction method.

On the other hand, in the NTL method, the ground immediately after excavation is
This is a primary lining method using a concrete lining formwork called a TL formwork. After excavating the tunnel by a predetermined distance, the NTL formwork is placed along the ground surface immediately after the excavation, and concrete or synthetic resin having fluidity and rapid hardening is poured and hardened between them. It is a construction method. In addition, as the NTL method, an NTL formwork composed of a plurality of partial formworks that can be expanded or contracted or expanded and that can be expanded along the tunnel ground is mounted on a rail suspended near the ceiling surface of the tunnel. There is also known an apparatus and a construction method in which an NTL form is supported by a traveling frame traveling along the excavator and driven by the traveling frame to reach a face.

Next, among the types of grounds, it is known that there are expansive grounds where the grounds after excavation protrude into the tunnel cross-section and collapsed grounds. For the ground having such properties, various auxiliary construction methods such as mirror spraying concrete and fore piling are employed to stabilize the ground.

[0006] Mirror spraying is a method of spraying quick-setting concrete on the surface of the excavation in the direction of excavation so as to prevent the surface of the rock from falling or collapsing. It is a construction method that tries to prevent the collapse of the ground by driving a proper bolt.

[0007]

Among the above conventional tunnel excavation and lining methods, the method using NATM not only deteriorates the working environment due to a large amount of dust rising when spraying concrete, There is a problem that material loss occurs due to rebound of the sprayed concrete bouncing off the ground. In addition, between the excavation process and the primary lining process, the excavator is retracted from the face, and then the concrete spraying machine is carried into the vicinity of the face. Required. Since this operation is performed in a narrow tunnel cross section, it is inevitably a difficult operation, and as a result, there is a disadvantage that the construction time is long.

Further, according to the NTL method, although the problems of material loss and deterioration of the working environment are solved, ordinary N
In the TL method, it is necessary to replace the excavator and the NTL construction machine having the NTL formwork between the excavation step and the primary lining step, and the problem that the construction time becomes longer remains.

On the other hand, there is provided an improved NTL method in which an NTL form is supported on a traveling frame traveling along a rail provided near the ceiling surface of the tunnel, so that the NTL form can be transported to a face over an excavator. For example, the work of exchanging the excavator and the NTL formwork between the excavation step and the lining step as described above becomes easy. However, this improved NTL
In the construction method, it is necessary to extend a rail for transporting the NTL form to the face in accordance with the excavation of the tunnel, and there is a problem that it takes time and effort.

Apart from these, there are a number of auxiliary construction methods, most of which are performed by exchanging excavators and dedicated equipment. In the auxiliary construction method, the long time required for replacement of the device is a serious problem not only in terms of cost but also in terms of construction quality and safety.
Depending on the nature of the ground, loosening and skin fall may occur unless lining or the like is performed immediately after excavation, and in extreme cases, even collapse may occur.

The present invention has been made in view of such circumstances, and it is easy to replace an excavator with other devices and the like, and there is no need to provide rails for transporting the devices and the like. Tunnel excavation and lining method and equipment that shorten the time required from the excavation step to the next step, and eliminate the need for equipment such as a base machine for transporting equipment etc. and reduce the construction cost The purpose is to provide.

[0012]

In order to achieve the above object, a tunnel excavation and lining method according to the present invention is capable of expanding or contracting a tunnel after excavating a tunnel to a required cross-sectional shape by a free-section excavator by a predetermined distance. And, after the lining formwork consisting of a plurality of partial formworks that can be extended along the tunnel ground is conveyed to the face by the free-section excavator and expanded and fixed, the formwork and the ground It is characterized by repeating the steps of casting concrete during the molding, removing the mold by shrinking or folding the form after the concrete is hardened, and then transporting the form backward by the free-section excavator. (Claim 1).

In the tunnel excavation and lining method of the present invention, the lining form has at least an inner space in the expanded state for allowing a free-section excavator to pass therethrough. The transport of the frame is performed by lifting the boom of the free-section excavator and traveling, and the adjustment of the installation position of the form is performed by driving the boom or the position adjusting means provided on the lining form. (Claim 2).

A tunnel excavation / lining apparatus according to the present invention is an apparatus used for the tunnel excavation / lining method according to the second aspect of the present invention. A lining mold comprising a plurality of expandable partial molds; and a free-section excavator having a boom provided with a bracket for detachably supporting the lining mold. The frame is characterized by having a space inside at least in the expanded state through which the free-section excavator can pass (claim 3).

In the tunnel excavation and lining apparatus of the present invention, as a preferred specific configuration, each of the partial forms of the lining form can be expanded and contracted or folded together, and In a state in which the frame can be extended along the frame, the frame is supported by a frame disposed at a substantially central portion thereof, and the frame is supported by a bracket provided on a boom of the free-section excavator. be able to.

According to the present invention, the working environment is basically improved by using the NTL method, the occurrence of material loss is prevented, and the transfer of the NTL formwork to the face and the transfer of the NTL form to the rear of the excavator, By doing with a free section excavator,
An object of the present invention is to achieve an intended purpose by eliminating the need for a form conveying device such as a form conveying rail and a traveling cart.

That is, in the method of the present invention, after the tunnel excavation step for a predetermined distance by the free-section excavator is completed, the lining form retracted rearward (hereinafter referred to as a portable NTL form). ) Is transported to the face by the free-section excavator itself and set, and concrete is poured into the ground. After the concrete is cured and the lining process is completed,
The process of shrinking or folding the portable NTL form, removing the mold, transporting the portable NTL form to the rear evacuation position by the free-section excavator, and restarting the tunnel excavation process is repeated. Therefore, a dedicated transport facility such as a rail for transporting the NTL formwork and a traveling trolley becomes unnecessary, and at the same time, the space occupied in the tunnel section is reduced, and the free-section excavator passes through the portable NTL formwork. As a result, the exchange between the NTL type excavator and the free section excavator becomes easy, and the time required between the excavation step and the lining step can be shortened.

In the invention method according to claim 2, the transport of the portable NTL form by the free-section excavator is facilitated by using the invention device according to claim 3,
A free space excavator passage space is formed at least inside the expanded portable NTL form, and the portable NTL form is lifted and conveyed via a bracket provided on a boom of the free section excavator, thereby allowing free movement. The transport mechanism to be added to the cross-section excavator and the portable NTL form becomes simple, and the portable NTL form is positioned by using the drive of the boom, or roughly positioned before the positioning. And so on.

A tunnel excavation and lining apparatus according to a fourth aspect of the present invention is an invention according to a more specific apparatus configuration for realizing the above-described method, and includes a plurality of parts constituting a portable NTL formwork. The formwork is supported by a frame arranged at approximately the center of these parts, and the frame is supported and conveyed by the bracket of the free-section excavator, so that a complex structure with a telescopic mechanism and a folding mechanism is provided. Portable NTL
The mold can be easily and reliably transported.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (A), (B)
FIG. 2 is a schematic explanatory view of a construction procedure of a tunnel excavation / lining method to which the present invention is applied.

In this construction method, as shown in FIG. 1A, a tunnel is excavated by a free-section excavator 1 and, at the same time, a well-known sliding function (a scraping device) attached to the free-section excavator 1. The conveyor is transported backward by the conveyor 1a, and is introduced into the conveyor 3a. It should be noted that the shear transport vehicle 3a and the battery locomotive 3b that pulls the same travel together with a concrete pump 4a and an agitator car 4b, which will be described later, run on a rail 5 laid to an appropriate position behind the face F in the tunnel T.
In this tunnel excavation step, the portable NTL form 2 whose structure will be described later is retracted to a position behind the face F.

When the tunnel excavation reaches a predetermined distance, the shelter truck 3a is retracted, and the shed is carried out to the wellhead, and is replaced with a concrete pump 4a and an agitator car 4b as shown in FIG. 1 (B). Into the mine, during which the free-section excavator 1 is retracted,
The free-section excavator 1 transports the portable NTL form 2 that has been retracted backward to the face F.
After expanding and fixing the TL form 2 along the ground immediately after excavation, a concrete pipe 6 is provided between the TL form 2 and the concrete pump 4a. Then, concrete is supplied to the portable NTL formwork 2 through the concrete pipe 6, and concrete is poured into the ground immediately after excavation.

Next, after the concrete has hardened, the portable NTL form 2 is contracted and released from the mold, and the free-form excavator 1 transports the portable NTL form 2 to the rear evacuation position. After that, returning to the excavation process of FIG. 1A, the same procedure is repeated, and every time the tunnel is excavated by a predetermined distance, the surface of the ground immediately after the excavation is covered with concrete.

Next, an apparatus used in the above-described method will be described in detail. FIG. 2 shows a front view of the portable NTL form 2 in an expanded and fixed state and a schematic front profile of the free-section excavator 1, and FIG. 3 is a sectional view taken along line AA of FIG.

The portable NTL formwork 2 in this embodiment comprises five partial formworks 21, 22, 23, 24 and 25.
A tip agitating nozzle 20a for casting concrete is attached to a partial mold 21 at the upper center (hereinafter, referred to as an upper partial mold 21).
Hinge 21 is provided at both left and right ends of the upper partial formwork 21.
a and 21b, the partial molds 22 and 23 (hereinafter, referred to as side partial molds 22 and 23) are joined together, and the lower ends of the side partial molds 22 and 23 are respectively partially The molds 24 and 25 (hereinafter referred to as lower partial molds 24 and 25) are supported so as to be slidable substantially vertically. The portable NTL formwork 2 is provided around the face side thereof with a formwork tube 20b which is inflated by air injection and pressed against the ground. Around the periphery, an overlap seal 20c is provided.

Hinges 21a, 21 are provided between the upper partial form 21 and the side partial forms 22 and 23 on both sides thereof.
By rotating in 1b, they fold each other,
Alternatively, hydraulic cylinders 21c and 21d for mutually expanding and locking are provided. Hydraulic cylinders 22a for sliding the lower partial molds 24, 25 relative to the side partial molds 22, 23 to expand and contract each other near the lower ends of the side partial molds 22, 23, respectively. , 23
a is provided. Further, each lower part form 24, 25
The form locking devices 24a, 24b for restricting sliding displacement with respect to the side part forms 22, 23 to substantially integrate them.
25a is provided.

A support frame 26 is provided at a substantially central portion inside each of the partial molds 21 to 25 described above. On an upper surface of the support frame 26, a form lift device 27 mainly composed of four hydraulic rams and the like, and a form horizontal moving device 28 including a hydraulic cylinder and the like are mounted. Formwork lift device 2
7 supports the upper partial mold 21, so that each of the partial molds 21 to 25 is entirely supported by the support frame 26 via the mold lift device 27. Further, the formwork lateral movement device 28 can move the entire formwork together with the formwork lift device 27 on the support frame 26. The support frame 26 has a support mechanism 26 detachably engaged with the bracket 12 attached to the boom 11 of the free-section excavator 1 as described later.
0 is provided. And this portable NTL formwork 2
In the expanded state shown in FIG. 2, a space through which the free-section excavator 1 can pass is formed as shown in FIG.

Further, between the supporting frame 26 and the left and right side partial molds 22 and 23, a form projecting rod jack 22 is provided.
Both ends of b and 23b are attached, respectively, and a bar jack 29 for a beam is removably inserted between the left and right lower partial forms 24 and 25. Then, in the form expanded state, as shown in FIG.
1 to 25 are along the ground through the gap G for placing concrete, and the respective partial forms are rigidly and substantially integrated with each other by the above jacks. By supplying air to the tube 20b, the face side of the gap G is sealed. In FIG. 1, 2
2c and 23c are folding scaffolds.

The portable NTL formwork 2 can be brought into a contracted (folded) state by the following procedure. FIG. 4 is an explanatory view of a shrinking procedure based on a front view of the portable NTL formwork 2. In FIG. 4, the left half in the figure is in the process of contraction,
The right half shows the contraction completed state. In order to contract the portable NTL form 2 in the expanded and fixed state, the form lift 2
7 is lowered and the hydraulic cylinders 21c, 21d are contracted to fold the upper part mold 21 and the side part molds 22, 23 on both sides thereof via hinges 21a, 21b. Rod jacks 22b, 23
shrink b. Further, the lower partial molds 24, 25 are raised by contracting the hydraulic cylinders 22a, 23a in a state in which the beam rod jack 29 is removed and the form lock devices 24a, 25a are released.

The contraction of the portable NTL formwork 2 is performed while being supported by the boom 11 of the free-section excavator 1. Hereinafter, a portable NTL formwork 2 using a free-section excavator 1
Will be described in detail. FIG. 5 is a side view showing a state in which the portable NTL form 2 in the contracted state is supported by the boom 11 of the free-section excavator 1, and the portable NTL form 2 is shown in a sectional view. 6 to 8 are enlarged views of the vicinity of the support portion in a state in which the portable NTL form 2 is supported by the free-section excavator 1, FIG. 6 is a front view of a main part viewed from the face F side, and FIG. 8 is a sectional view taken along the line AA in FIG. 7. FIG.

Pins 12a are fixed to the boom 11 of the free-section excavator 1 on covers 11a of boom extension / retraction cylinders provided on both left and right sides thereof, respectively. 12 are supported. The bracket 12 has two plate-like members 12b and 12c on both left and right sides whose base ends are rotatably supported on the respective pins 12a, and a position regulating member 12d fixed between them. And each plate member 12b,
A pin 12e, both ends of which are fixed to the tip end of 12c, is mainly constituted, and a recess D is formed at the approximate center of the upper surface of each of the plate members 12b, 12c. The position restricting member 12d contacts the surface of the boom 11 when the bracket 12 is pivoted toward the distal end side of the boom 11 and regulates the pivotal end thereof. Plays a role in stabilizing the position in the
Then, the bracket 12 is detachably engaged with a support mechanism 260 provided on the support frame 26 of the portable NTL form 2, and the boom 11 is
Thereby, the portable NTL formwork 2 can be lifted.
When the portable NTL form 2 is not supported, the bracket 12 is rotated to the rear end of the boom 1 as shown by a two-dot chain line in FIG.

The support mechanism 260 provided on the support frame 26 of the portable NTL form 2 includes left and right pins 261 a and 261 b fixed to the support frame 26, and a slide mechanism 262 fixed to the support frame 26. A gripping hook 263 slidably supported in the front-rear direction of the portable NTL formwork 2 and a hydraulic cylinder 264 for slidingly displacing the gripping hook 263 along the slide mechanism 262. Is configured as The bracket 12 on the boom 11 side of the free-section excavator 1 has the left and right pins 261a, 261b of the portable NTL form 2 fitted into the recesses D of the left and right plate members 12b, 12c,
The pin 12e at the tip of the bracket 12 is a portable NTL form 2
The pins 261a and 261b are
The portable N
The support mechanism 260 on the TL form 2 side is combined with each other. In this state, the portable NTL form 2 is stably supported by the boom 11 of the free section excavator 1, and as shown in FIG. 2 can be transported.

Next, in the construction method according to the present invention shown in FIG. 1, the process of transporting the portable NTL form 2 by the free-section excavator 1 will be described in more detail. Portable NTL formwork 2
In the retracted state at the rear, each of the partial molds 21 to 25 is fixed or temporarily fixed in the tunnel as an expanded state. In order to transport the portable NTL form 2 to the face F with the free-section excavator 1, the free-section excavator 1 is moved backward while the bracket 12 is turned to the tip side of the boom 11, and the vehicle body is moved. Portable NTL formwork 2 with main body expanded
Is stopped at a position where the bracket 12 on the boom 11 arrives immediately below the support mechanism 260 after passing through a space formed below the support mechanism 260. Next, the portable NTL form 2 is contracted by the above procedure, and the support mechanism 260 of the support frame 26 and the bracket 12 of the boom 11 of the free-section excavator 1 are united with each other. By moving the section excavator 1 forward, the portable NTL form 2 is transported to the face F.

Thereafter, the portable N
The rough positioning of the TL form 2 is performed, the accurate positioning is performed by driving the form lateral moving device 28, and the respective partial forms 21 to 25 are formed by a procedure reverse to the above-described contraction procedure of the portable NTL form 2. To expand the ground immediately after excavation
To open and cover, and formwork overhanging rod jacks 22b, 23
b, and at the same time, the trunk rod jack 29 is mounted and extended to fix the portable NTL formwork 2. Also,
Air is supplied to the wife form tube 20b to inflate it, and the gap G is sealed.

After the concrete is poured into the gap G through the tip stirring nozzle 20a provided in the upper partial mold 21 of the portable NTL form 2 and hardened, the portable NTL form 2 is removed from the mold. In order to retreat backward, the portable NTL form 2 is contracted and removed according to the above procedure, and is supported by the boom 11 of the free-section excavator 1, and the free-section excavator 1 is moved backward to the retreat position. Conveyed to. At the retracted position, the portable NTL form 2 is expanded and fixed or temporarily fixed, and then the free-section excavator 1 is moved forward under the space below the portable NTL form 2 so that the face F
Return to and restart the excavation work.

In the above embodiment of the present invention, it should be noted that no special equipment for transporting the portable NTL form 2 in the tunnel is required at all, and the excavation step and the lining step Between the portable NTL form 2 and the free-section excavator 1 can be easily exchanged between the above-mentioned steps, whereby the rail for form transfer can be used for tunnel excavation as in the improved NTL method described above. There is no need to extend at the same time,
In addition, the time required between the excavation step and the lining step can be reduced, and at the same time, the labor can be reduced.

In the above embodiment, the face F
The fixing of the portable NTL formwork 2 in the expanded state may be performed only by the formwork itself or the free section excavator 1
May be fixed by being supported by the boom 11.

The detailed structure of the portable NTL form 2 and
Free-section excavator 1 to support the portable NTL form 2
The detailed structure and the like of the bracket 12 provided on the boom 11 are not limited to the structure adopted in the above embodiment, and can be arbitrarily modified within a range in which the operation of the present invention described above can be exerted. Of course.

As an application of the present invention, a support mechanism similar to the support mechanism 260 according to the present invention is attached to a concrete spraying robot used for mirror spraying concrete or the like or a drilling machine used for fore piling. Similar to the portable NTL form 2, an auxiliary construction method of transporting by the free-section excavator 1 is conceivable.

For example, as in the case of the portable NTL form 2, a gantry through which the free-section excavator 1 can pass is placed inside the tunnel pit, and a device such as a concrete spraying robot equipped with a support mechanism is temporarily placed. deep.

Excavation is performed by the free-section excavator 1, and when the excavation is completed, the free-section excavator 1 is retracted, passes through the space under the gantry, and the position where the bracket 12 on the boom 11 arrives immediately below the support mechanism of the apparatus. To stop. Next, the support mechanism of the apparatus and the bracket 12 of the boom 11 of the free-section excavator 1 are combined with each other in the same manner as described above, and in this state, the apparatus is lifted from the gantry and the free-section excavator 1 is advanced. With this, the apparatus is transported to the face F.

At the face F, the apparatus can be moved by driving the boom 11 to perform the work. After completion of the construction, the free-section excavator 1 is retracted, the apparatus is placed on the gantry, and the union of the support mechanism of the apparatus and the bracket 12 of the boom 11 of the free-section excavator 1 is released. Thereafter, the free-section excavator 1 can move to carry the portable NTL formwork 2 or move to an excavation process.

If power can be supplied from a power source such as a hydraulic pump incorporated in the free-section excavator 1 to the device or the like via power supply means such as a pipe, a dedicated device for the device or the like can be provided. No power source is required, and the construction cost can be further reduced. Of course, the devices and the like mentioned here are
It is not limited to concrete spraying robots and drilling machines. By the way, such power supply is portable NTL
The present invention is also applicable to expansion of the mold 2 and other driving mechanisms.

The mechanism for combining the apparatus and the like with the free-section excavator is not limited to the above-described one, and may be modified as long as the above-described effects can be obtained. Furthermore, the gantry on which the apparatus is temporarily placed is not indispensable in the application method of the present invention or the configuration of the apparatus, and the apparatus and the like may have a free section excavated by another means depending on the specifications such as the shape and weight. Can be combined with the machine.

[0045]

As described above, according to the present invention, the portable NTL form is transported by the free-section excavator so that it is set on the face and retracted backward.
It is not necessary to provide a dedicated facility for transferring the formwork in the tunnel, and the excavator and the portable NTL formwork can be easily replaced between the excavation step and the lining step. In this case, the required time and labor can be shortened between the lining process and the lining process, and the working period and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a construction procedure to which a tunnel excavation and lining method of the present invention is applied, wherein (A) illustrates a digging step and (B) illustrates a lining step.

FIG. 2 is a diagram showing a front view of a portable NTL form 2 used in the method of FIG. 1 in an expanded and fixed state and a schematic front profile of a free-section excavator 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram of a contraction procedure of the portable NTL formwork 2 shown in FIG. 2, in which a left half shows a contraction process and a right half shows a contraction completed state.

5 is a partial cross-sectional side view showing a state in which the portable NTL formwork 2 shown in FIG. 2 is contracted and supported by the boom 11 of the free-section excavator 1. FIG.

FIG. 6 is an enlarged front view of a main part near a support in the state of FIG. 5;

7 is an enlarged rear view of a main part near the support part in the state of FIG. 5;

FIG. 8 is a sectional view taken along line AA of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Free-section excavator 11 Boom 12 Bracket 12a Bracket rotation support pin 12b, 12c Plate-like member 12d Position control member 12e Pin 2 Portable NTL form 21 Upper part form 21a, 21b Hinge 22, 23 Side part Formwork 24, 25 Lower partial formwork 26 Support frame 260 Support mechanism 261a, 261b Pin 262 Slide mechanism 263 Hook for gripping 264 Hydraulic cylinder 27 Formwork lift device 28 Formwork lateral movement mechanism 3a Shelf transporter 3b Battery locomotive 4a Concrete Pump 4b Agitator car 5 Rail F Face G Gap T Tunnel

Claims (4)

[Claims] 1. A lining comprising a plurality of partial forms that can be expanded or contracted or foldable and extensible and fixed along the ground of a tunnel after excavating a tunnel to a required cross-sectional shape by a free-section excavator by a predetermined distance. After the formwork is conveyed to the face by the free-section excavator and expanded and fixed, concrete is poured between the formwork and the ground, and after the concrete is hardened, the formwork is contracted or folded. A method of excavating and lining a tunnel, comprising repeating a step of transporting the formwork backward by the free-section excavator after removing the mold. 2. The lining form has at least an inner space in the expanded state through which a free-section excavator can pass, and the transfer of the lining form is performed by a boom of the free-section excavator. 2. The tunnel excavation according to claim 1, wherein the position of the formwork is adjusted by driving the boom or by a position adjusting means provided on the lining formwork, while performing the lifting by traveling. -Lining method. 3. An apparatus used for the tunnel excavation and lining method according to claim 2, wherein the lining is composed of a plurality of partial molds that can be expanded or contracted or folded and that can be expanded along the tunnel ground. And a free-section excavator in which a bracket for detachably supporting the lining form is provided on a boom, and the lining form is at least in its expanded state inside the excavator. A tunnel excavation / lining device having a space through which a free-section excavator can pass. 4. The partial formwork of the lining formwork is supported by a frame disposed inside the lining formwork so as to be able to expand and contract with each other or expand along the tunnel ground. 4. The tunnel excavation / lining apparatus according to claim 3, wherein the frame is supported by a bracket provided on a boom of the free-section excavator.