JP2017082484A - Form device and construction method of lining concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a surface quality of lining concrete.SOLUTION: A form device 1 used for placing concrete on a tunnel inner peripheral surface 2, comprises an arched form 5 having an outer peripheral surface opposed to the tunnel inner peripheral surface 2 and a placing port 81 provided in the form 5 and used for placing the concrete in a space (a lining space) S between the tunnel inner peripheral surface 2 and the outer peripheral surface of the form 5. The placing port 81 is provided in a lower end part of the form 5. A method for constructing lining concrete by placing the concrete on the tunnel inner peripheral surface 2 by using the form device 1, includes a process of supplying the concrete in the lining space S from the placing port 81. The process of supplying the concrete in the lining space S includes pressing the concrete in the lining space S from the placing port 81 in a state of positioning an upper surface 90 of the concrete supplied in the lining space S from the placing port 81, in a higher position than the placing port 81.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a formwork device used for placing concrete on the inner peripheral surface of a tunnel, and a method for constructing lining concrete on the inner peripheral surface of a tunnel using this device.

In the construction of a mountain tunnel, for example, when performing construction using the NATM method, first, spray concrete is sprayed as the primary lining on the inner peripheral surface of the tunnel formed by blast excavation, etc. A waterproof sheet is installed, and as the secondary lining, lining concrete is constructed using an arch-shaped formwork having an outer peripheral surface facing the inner peripheral surface of the tunnel.
An example of such an arch-shaped formwork is disclosed in Patent Document 1.

JP 2013-163965 A

By the way, in the construction of lining concrete as described above, a plurality of confirmation windows are provided in advance in the arch-shaped formwork, and a space between the inner peripheral surface of the tunnel and the outer peripheral surface of the formwork is formed from the confirmation window. Concrete is often placed inside (in the lining space). When placing concrete by allowing it to freely fall in the lining space during concrete placement, the concrete entrains air, so that the surface of the concrete that touches the outer peripheral surface of the mold is blown (surface bubbles). The concrete was cured in an exposed state. The formation of this abutment is particularly the concrete surface (in other words, the arch-shaped formwork that is in contact with the portion of the face plate that constitutes the outer peripheral surface of the formwork that is inclined downward toward the inside of the tunnel. The surface of the concrete contacted with the outer peripheral surface of the lower end portion of the substrate was remarkable. Therefore, the deterioration of the surface quality at the lower end of the lining concrete has been a problem.
In view of such a situation, an object of the present invention is to improve the surface quality of lining concrete.

  Therefore, in the first aspect of the present invention, the formwork apparatus is used for placing concrete on the inner peripheral surface of the tunnel, and an arch-shaped formwork having an outer peripheral surface facing the inner peripheral surface of the tunnel, and a mold A casting port provided in the frame and used for placing concrete into a space between the inner circumferential surface of the tunnel and the outer circumferential surface of the mold, and the casting port is provided at the lower end of the mold Is provided.

  In the second aspect of the present invention, the formwork device is used for placing concrete on the inner peripheral surface of the tunnel, and an arch-shaped formwork having an outer peripheral surface facing the inner peripheral surface of the tunnel, and the formwork And a casting port used for placing concrete into the space between the inner circumferential surface of the tunnel and the outer circumferential surface of the mold, and the mold is connected in the circumferential direction of the tunnel It is composed of a plurality of foams, and the placement opening is provided in the lower half region of the foam located on the lowermost side.

  In the third aspect of the present invention, the method for constructing lining concrete is a method for constructing lining concrete by placing concrete on the inner peripheral surface of the tunnel using the formwork device of the first aspect or the second aspect described above. And the step of supplying concrete into the space from the placement port, wherein the step of supplying the concrete into the space is such that the top surface of the concrete supplied from the placement port into the space is from the placement port. And press-fitting concrete into the space from the placement port in a state of being positioned at a high level.

  According to the first aspect and the third aspect of the present invention, the casting port used for placing concrete into the space between the inner circumferential surface of the tunnel and the outer circumferential surface of the arch-shaped mold is the mold. Is provided at the lower end portion. Thereby, since concrete can be press-fitted into the space between the lower end portion of the mold and the inner peripheral surface of the tunnel through the placement port, free fall of the concrete in the lining space is suppressed. The amount of air entrainment can be reduced. Therefore, it is possible to suppress the formation of fluttering on the concrete surface in contact with the outer peripheral surface of the lower end portion of the formwork, and as a result, the surface quality of the lining concrete can be improved.

  According to the second aspect and the third aspect of the present invention, the casting port used for placing concrete into the space between the inner circumferential surface of the tunnel and the outer circumferential surface of the arch-shaped mold frame is the mold frame. Is provided in the lower half region of the foam located at the lowermost side among the plurality of foams constituting. As a result, concrete can be pressed into the space between the lower half area of the foam located on the lowermost side and the inner peripheral surface of the tunnel through the placement port, so that the concrete in the lining space of the concrete Free fall is suppressed and the amount of air entrainment can be reduced. Therefore, it is possible to suppress the formation of a blow on the concrete surface in contact with the outer peripheral surface of the lower half region of the foam located on the lowermost side, thereby improving the surface quality of the lining concrete.

The figure which shows schematic structure of the formwork apparatus in one Embodiment of this invention. Side view of lower end foam in the same embodiment AA sectional view of FIG. Side view of lower end foam member in same embodiment The figure which shows the placement of the concrete to the lower end part of the lining space in embodiment same as the above Side view of the 1st modification of lower end form in embodiment same as the above Side view of the 2nd modification of lower end form in embodiment same as the above

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a formwork apparatus according to an embodiment of the present invention.
The formwork apparatus 1 is arranged in a mountain tunnel pit that has been primary lining by shotcrete (not shown).

The movable formwork apparatus 1 includes a portal-type movable carriage (gantry) 4 capable of traveling on the bottom surface 3 of a tunnel in the tunnel axis direction, and an arch-shaped mold disposed so as to cover the gantry 4 from above. And a frame 5.
The gantry 4 has a predetermined length in the tunnel axis direction, and moves on the rail 42 laid on the tunnel bottom surface 3 at the lower end of the leg portion 41 at the front and rear ends (ends in the tunnel axis direction). A self-propelled device 43 is provided. Here, the rail 42 extends in a predetermined length in the tunnel axis direction. In this embodiment, the gantry 4 travels by the self-propelled device 43, but the travel mode is not limited to this. For example, the gantry 4 is configured to be pulled by a traction device such as an electric winch. May be.

A plurality of legs (not shown) located in the middle of the tunnel axis direction of the gantry 4 are each provided with an auxiliary jack (not shown) at the lower end. This auxiliary jack restricts the movement of the gantry 4 when the gantry 4 is stopped.
An internal space 46 is formed inside the gantry 4 so that a work vehicle (for example, a projecting truck) can easily pass in the tunnel axial direction.

The gantry 4 is provided with a wind pipe (not shown) for blowing air, a continuous bell-con device (not shown) for carrying out tunnel excavation, and a work scaffold (not shown). The work scaffold is used during concrete placement work.
Further, the gantry 4 is provided with piping (not shown) for pumping concrete for lining, and the leading ends of these piping are respectively a plurality of placement ports provided in the mold 5. (Not shown). Among these placement ports, the placement port 81 shown in FIGS. 2 to 5 described later is provided at the lower end portion of the mold 5. Details of the placement port 81 will be described later. Moreover, the above-mentioned piping for pumping concrete for lining corresponds to the “concrete supply pipe” of the present invention.

The formwork 5 (forms 51, 52, 53 described later) forms a space (covering space) S for placing concrete between the inner peripheral surface 2 of the tunnel.
The mold 5 is composed of a plurality of arc-shaped foams 51, 52 and 53, and each foam is connected to the gantry 4 via a jack (not shown).
The mold 5 is formed so that its shape follows the shape of the tunnel lining.

  The formwork 5 includes a top end form 51 located at the top, a side form 52 pivotally supported on both ends of the top end form 51 via a hinge mechanism 61, and a bottom end of the side foam 52 via a hinge mechanism 62. And a supported lower end form 53. In other words, the formwork 5 is divided into five small forms (one top end form 51, two side forms 52, and two lower end forms 53) in series in the circumferential direction of the tunnel. The foams are connected to each other via hinge mechanisms 61 and 62. In this embodiment, the mold 5 is divided into five small forms in series in the tunnel circumferential direction. However, the number of divisions is not limited to this, and the mold 5 is 5 in series in the tunnel circumferential direction. Preferably it is divided into two or more small forms.

The top end form 51 is supported by a plurality of jacks (not shown) provided on the top of the gantry 4 so as to be movable up and down. Therefore, the top end form 51 is connected to the gantry 4 via the jack.
Each of the side foam 52 and the lower end foam 53 is connected to a plurality of jacks (not shown) provided on the legs of the gantry 4, and is moved in and out of the tunnel by expansion and contraction of these jacks. Therefore, the side form 52 and the lower end form 53 are connected to the gantry 4 via the jack.

Therefore, the mold 5 composed of the foams 51, 52, and 53 can be expanded and contracted by expansion and contraction of a plurality of jacks (not shown). That is, the mold 5 can be deformed into an expanded state in which the lining space S is formed between the inner periphery 2 of the tunnel and a reduced diameter state smaller in the tunnel radial direction than the expanded state.
When the formwork 5 is in the unfolded state, it is supported by the gantry 4 and forms a lining space S between the inner periphery 2 of the tunnel. When the formwork 5 is in the unfolded state, the concrete is placed and cured in the lining space S.
At the time of demolding after placing and curing concrete in the lining space S, the mold 5 is deformed into a reduced diameter state. The formwork apparatus 1 including the formwork 5 in the reduced diameter state moves in the tunnel axis direction to the next concrete placement position (lining concrete construction position).

Here, the mold 5 is formed by connecting a plurality of (7 in this embodiment) arch-shaped mold members 50 having a predetermined width (for example, 1.5 m width) in the tunnel axis direction to each other in the tunnel axis direction. It is configured as a span (for example, 10.5 m). The width of the formwork member 50 is not limited to this. Further, the number of mold members 50 per span of the mold 5 is not limited to this.
Therefore, in the present embodiment, the top end foam members 51a of the seven mold members 50 are connected to each other in the tunnel axis direction to form the top end foam 51. Further, the side foam members 52a of the seven mold members 50 are connected to each other in the tunnel axis direction to form the side foam 52. Further, the lower end foam members 53a (lower end foam members 53a-1 to 53a-7 described later) of the seven mold members 50 are connected to each other in the tunnel axis direction to form the lower end foam 53.

Next, in addition to FIG. 1, the lower end form 53 is demonstrated using FIGS.
FIG. 2 is a side view (right side view) of the lower end foam 53 on the right side in FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 and is a front view of the lower end foam member 53a-4. FIG. 4 is a side view (right side view) of the lower end foam member 53a-4. Here, as shown in FIG. 2, the face side (wife side) and the wellhead side (lap side) are defined and described below.

In the present embodiment, the lower end foam 53 is configured by seven lower end foam members 53a-1 to 53a-7. The lower end foam members 53a-1 to 53a-7 are connected in this order in a line from the face side to the wellhead side.
A plurality of plate-like brackets 62 a are provided at the upper end of the lower end form 53. The bracket 62a constitutes the hinge mechanism 62, and a through hole (not shown) is formed. Further, a plurality of plate-like brackets (not shown) constituting the hinge mechanism 62 are provided at the lower end of the side foam 52 so as to correspond to these brackets 62a, and these brackets also pass through not shown. A hole is formed. In the present embodiment, a pin (not shown) is inserted into the through hole of the bracket 62 a provided at the upper end of the lower end foam 53 and the through hole of the bracket provided at the lower end of the side foam 52 to form the hinge mechanism 62. ing.

The lower end foam member 53a-4 located at the center portion in the tunnel axial direction of the lower end form 53 is provided on the frame 71 so as to close the metal frame 71 and the opening of the frame 71 on the outside of the tunnel (natural ground side). And the face plate portion 72.
The face plate portion 72 constitutes the outer peripheral surface of the lower end portion of the mold 5. The lower end portion of the face plate portion 72 is constituted by a metal face plate 73, and the remaining portion is constituted by a resin-made (for example, acrylic resin) face plate 74. The face plate 74 is transparent or translucent. A metal plate member 75 is interposed between the face plate 74 and the frame body 71, and a plurality of (10 in FIG. 4) window portions 76 are formed through the plate member 75. Yes. Therefore, the operator can confirm the concrete placement condition in the lining space S by looking at the window 76 from the inside of the mold 5.
The face plate portion 72 (face plates 73 and 74) is inclined so as to be directed toward the inner side of the tunnel as it goes downward (in other words, curved). Therefore, the concrete that is placed in the lining space S and contacts the face plate portion 72 has a contact surface (finished surface) inclined upward.

A through hole 78 is formed in the face plate 73. The cylindrical member 79 is erected on the inner surface (surface inside the tunnel) of the face plate 73, and an opening on one end side thereof is continuous with the through hole 78. An outer flange portion 80 is formed in the opening on the other end side of the cylindrical member 79. Here, the placing port 81 that can be used for placing concrete into the lower end portion of the lining space S is constituted by a through hole 78 and a cylindrical member 79.
The placing port 81 can supply the concrete to the lining space S obliquely downward. Further, the placement port 81 is provided in the lower half region of the lower end foam 53 located on the lowermost side of the foams 51 to 53 (in the present embodiment, in particular, the lower end portion of the lower end form 53).
In addition, although illustration is abbreviate | omitted, the shutter which can close the opening (or through-hole 78) of the one end side of the cylindrical member 79 is provided in the lower end foam member 53a-4.

In the present embodiment, the lower end foam members 53a-1, 53a-3, 53a-5, and 53a-7 are configured by a frame 71 and a face plate portion 72 in the same manner as the lower end foam member 53a-4. However, the lower end foam members 53 a-1, 53 a-3, 53 a-5, and 53 a-7 are such that the face plate portion 72 is composed only of the resin face plate 74 and does not have the placement port 81. Thus, it is different from the lower end foam member 53a-4.
In the present embodiment, the lower end foam members 53a-2 and 53a-6 are configured by a frame body 71 and a face plate portion 72, similarly to the lower end foam member 53a-4. However, in the lower end foam members 53a-2 and 53a-6, the face plate portion 72 is configured only by a resin face plate 74 (transparent or translucent), and more window portions 76 than the lower end foam member 53a-4. Is different from the lower end foam member 53 a-4 in that it has a sword and a point that does not have the placement port 81.

  The configurations of the lower end foam members 53a-1 to 53a-7 are not limited to those described above. That is, for each of the lower end foam members 53a-1 to 53a-7, the configuration of the face plate portion 72, the number of window portions 76, the presence / absence of the placement port 81, the number of installation ports 81, and the like can be arbitrarily set. Needless to say, it can be done.

  In the present embodiment, the concrete placed in the lining space S is medium fluidity concrete. Medium fluidity concrete is described in "Tunnel Construction Management Guidelines (Main Body), July 2015 Edition" (East Japan Expressway Co., Ltd., Central Japan Expressway Co., Ltd., West Japan Expressway Co., Ltd.) . This “Tunnel Management Guidelines (Main Body) July 2015 Edition” states that “medium fluid concrete is slump flow of about 35-50 cm, slump 15-18 cm normal (conventional) concrete and slump flow 65 cm. There is a description that "the concrete has intermediate properties of high fluidity concrete of a degree". In the present embodiment, medium fluidity concrete is used as the concrete to be placed in the lining space S, but it goes without saying that other concrete may be used.

Next, a concrete placing method in the lining space S will be described with reference to FIG. 5 in addition to FIGS.
FIG. 5 is a view showing placement of concrete on the lower end portion of the lining space S. As shown in FIG.

When placing concrete in the lining space S, the formwork 5 is in an unfolded state.
First, prior to supplying concrete into the lining space S, a pipe (concrete supply pipe) for pressure-feeding the above-mentioned concrete for lining is connected to the placement port 81. In this connection, a pipe (concrete supply pipe) for pressure-feeding the above-mentioned concrete for lining using a pipe joint having a pressure resistance (for example, a mechanical joint such as a victic joint) is connected to the placement port 81 ( Specifically, it is detachably connected to the outer flange portion 80) of the cylindrical member 79. Here, the Victoria joint is a gasket having a special shape at the end of the pipe (concrete supply pipe) for pressure-feeding the concrete for lining described above and the end (outer flange portion 80) of the cylindrical member 79. It is a pipe joint that fits (not shown), covers a housing (not shown) from above, and is tightened with bolts and nuts.

  Next, the concrete from the piping (concrete supply pipe) for pumping the above-mentioned concrete for lining is supplied into the lining space S from the placement port 81. At this time, as shown in FIG. 5, in a state where the upper surface 90 of the concrete supplied into the lining space S from the placement port 81 is positioned higher than the placement port 81 (at least the through hole 78), Concrete is pressed into the lining space S from the placing port 81. Thereby, since the amount of air entrained in the concrete can be reduced, it is possible to suppress the formation of a blow on the finished surface of the concrete.

  The press-fitting of the concrete from the placement port 81 is continued until the finished surface of the concrete is not obliquely upward. When the press-fitting of the concrete from the placement port 81 is completed, the concrete is supplied into the lining space S from the placement hole or the confirmation window provided in the side foam 52 and the top end form 51 as in the conventional case, and the arch Shaped lining concrete is constructed.

  By the way, as in Patent Document 1, when a vibrator is provided at the lower end of the arch-shaped formwork and the concrete before hardening is compacted by vibration of the vibrator, the air in the concrete is in an area where the vibration of the vibrator is strong. Due to the property of being easy to gather, there was a problem that a lot of flapping was formed on the surface of the lower end portion of the lining concrete, and as a result, the surface quality was deteriorated. Therefore, in the present embodiment, the vibration supplied from the vibrator is not applied to the concrete supplied from the placement port 81 to the lower end portion of the lining space S. Thereby, it is possible to further suppress the formation of flutter on the concrete surface in contact with the outer peripheral surface (face plate portion 72) of the lower end portion of the mold 5.

  According to this embodiment, a mold apparatus 1 used for placing concrete on the inner peripheral surface 2 of the tunnel includes an arch-shaped mold 5 having an outer peripheral surface facing the inner peripheral surface 2 of the tunnel, and the mold 5 And a placement port 81 used for placing concrete into the space (lining space) S between the inner circumferential surface 2 of the tunnel and the outer circumferential surface of the mold 5. A placement port 81 is provided at the lower end of the mold 5. Thereby, since concrete can be press-fitted into the space (covering space) S between the lower end portion of the mold 5 and the tunnel inner peripheral surface 2 through the placement port 81, the inside of the concrete covering space S The free fall at this point is suppressed, and the amount of air entrainment can be reduced. Therefore, it is possible to suppress the formation of fluttering on the concrete surface in contact with the outer peripheral surface of the lower end portion of the formwork 5, and thus improve the surface quality of the lining concrete.

  Moreover, according to this embodiment, the placement port 81 is provided in the face plate (face plate part 72) which comprises the outer peripheral surface of the formwork 5, and the placement port 81 is among the face plates (face plate part 72). It is provided in the part which inclines so that it may go inside a tunnel, so that it goes below. As a result, it is possible to prevent air from being caught in the concrete when constructing a part where the concrete finish surface is obliquely upward, which is concerned about the formation of the fluttering, so that the surface quality of the lining concrete can be improved. Can do.

  Moreover, according to this embodiment, at least a part (face plate 74) of the face plate (face plate portion 72) is made of resin. Here, since the resin face plate has a lower thermal conductivity than the metal face plate, the heat retaining property is high. Therefore, even in the construction of lining concrete in cold districts, the concrete tends to harden. Further, the surface of the lining concrete becomes smooth and the surface layer portion of the lining concrete becomes solid. Therefore, since the permeability coefficient of the lining concrete can be kept low, it is possible to construct the lining concrete that is difficult to pass air. Therefore, the quality of the lining concrete after demolding can be improved. Moreover, the lining concrete which can have favorable durability over a long period of time can be constructed.

  Moreover, according to this embodiment, the part (face plate 73) in which the placement opening 81 is provided among face plates (face plate part 72) is metal. Thereby, the installation location of the placement port 81 in which high intensity | strength is required in the faceplate part 72 can be strengthened.

  Moreover, according to this embodiment, at least a part (face plate 74) of the face plate (face plate portion 72) is transparent or translucent. Thereby, the worker can confirm the concrete placement state in the lining space S by looking at the place where the face plate 74 is installed from the inside of the mold 5.

  Moreover, according to this embodiment, the formwork 5 is comprised by the some form (The top end form 51, the side form 52, the lower end form 53) connected to the tunnel circumferential direction. The formwork apparatus 1 includes hinge mechanisms 61 and 62 for connecting adjacent foams (the top end form 51, the side form 52, and the bottom form 53) in the tunnel circumferential direction. Thereby, the formwork 5 can be deform | transformed from the above-mentioned expansion | deployment state to a reduced diameter state, or the reverse.

  By the way, when the mold 5 is deformed from the expanded state to the reduced diameter state, the side foam 52 and the lower end foam 53 are bent via the hinge mechanism 62. At the time of this bending, if the driving hole 81 exists in the vicinity of the hinge mechanism 62, this driving hole 81 (tubular member 79) functions like a stick and there is a risk of disturbing the bending. In this regard, according to the present embodiment, the placement port 81 is provided at the lower end portion of the lowermost foam (lower end foam 53). That is, the placement port 81 is provided at a position away from the hinge mechanism 62 in the lower end foam 53. Therefore, since the placement port 81 does not interfere with the bending during the bending, the work of deforming the mold 5 from the expanded state to the reduced diameter state can be performed efficiently.

  Moreover, according to this embodiment, the concrete used for construction of lining concrete is medium fluidity concrete. Thereby, compared with using normal (conventional) concrete, since concrete can be poured over a wide range from one placing port, the number of placing ports provided in the mold 5 can be reduced.

  Further, according to the present embodiment, the method of constructing the lining concrete by placing concrete on the inner peripheral surface 2 of the tunnel using the formwork apparatus 1 is the method of placing the concrete from the placement port 81 into the space (lining space) S. A step of supplying the inside. In the step of supplying concrete into the space (lining space) S, the upper surface 90 of the concrete supplied into the space (lining space) S from the placement port 81 is positioned higher than the placement port 81. In this state, it includes pressing the concrete into the space (lining space) S from the placement port 81 (see FIG. 5). As a result, concrete can be pressed into the space between the lower end portion of the mold 5 and the inner peripheral surface 2 of the tunnel (lower end portion of the lining space S) via the placement port 81, so that the concrete lining space The free fall in S can be suppressed and the amount of air entrainment can be reduced. Therefore, it is possible to suppress the formation of fluttering on the concrete surface in contact with the outer peripheral surface of the lower end portion of the formwork 5, and thus improve the surface quality of the lining concrete.

  Further, according to the present embodiment, the method for constructing the lining concrete is that the concrete supply pipe (the concrete for lining described above) is placed in the placing port 81 prior to the step of supplying the concrete into the space (lining space) S. The method further includes a step of connecting a pipe for pressure feeding. The step of connecting the concrete supply pipe to the placement port 81 includes detachably connecting the concrete supply pipe to the placement port 81 using a pressure-resistant pipe joint. Therefore, when the mold 5 is deformed from the expanded state to the reduced diameter state, the concrete supply pipe can be detached from the placement port 81 prior to the deformation to the reduced diameter state.

  Further, according to the present embodiment, in the step of supplying concrete into the space (lining space) S from the placement port 81, vibration from the vibrator is applied to the concrete supplied into the space (lining space) S. Absent. Thereby, it is possible to suppress the formation of flutter on the concrete surface in contact with the outer peripheral surface (face plate portion 72) of the lower end portion of the mold 5.

In the present embodiment, for example, as shown in FIG. 6, the lower end foam members 53 a-1 to 53 a-3 and the lower end foam members 53 a-4 to 53 a-7 have the same configuration, and all the lower end foam members are plural. The window portion 76 may be provided. In addition, as shown in FIG. 7, the lower end foam 53 may be provided with two or more placement ports 81.
In the present embodiment, all the face plate portions 72 of the lower end foam members 53a-1 to 53a-7 may be made of metal.

  Further, in the present embodiment, an example in which the placement port 81 is provided at the lower end portion of the lower end form 53 positioned on the lowermost side among the forms 51 to 53 is shown. It is sufficient to be provided in the lower half region of the lower end foam 53 located at the lowermost side of .about.53. Since the casting port 81 is provided in the lower half area of the lower end foam 53, the casting port 81 is provided in a space (covering space) S between the lower half area of the lower end foam 53 and the inner peripheral surface 2 of the tunnel. Since concrete can be press-fitted through 81, free fall of the concrete in the lining space S can be suppressed, and the amount of air entrained can be reduced. Therefore, it is possible to suppress the formation of fluttering on the concrete surface in contact with the outer peripheral surface of the lower half region of the lower end foam 53, and consequently improve the surface quality of the lining concrete. Moreover, it is preferable not to give the vibration from a vibrator to the concrete adjacent to the lower end foam 53 among the concrete supplied in the space (lining space) S, and the lower half area (particularly the lower end portion) of the lower end foam 53 It is further preferable not to give vibrations from the vibrator to the concrete adjacent to ().

  The illustrated embodiments are merely examples of the present invention, and the present invention is not limited to those directly described by the described embodiments, and various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it encompasses changes.

1 Formwork device 2 Tunnel inner peripheral surface 3 Tunnel bottom surface 4 Gantry (moving cart)
5 Form 41 Leg part 42 Rail 43 Self-propelled device 46 Internal space 50 Form member 51 Top form (form)
51a Top end foam member 52 Side form (form)
52a Side foam member 53 Lower end foam (form)
53a-1 to 53a-7 Lower end foam members 61, 62 Hinge mechanism 62a Bracket 71 Frame body 72 Face plate portions 73, 74 Face plate 75 Plate member 76 Window portion 78 Through hole 79 Cylindrical member 80 Outer flange portion 81 Installation port 90 Top surface S Lining space (space)

Claims (11)

A formwork device used for placing concrete on the inner peripheral surface of a tunnel,
An arch-shaped formwork having an outer peripheral surface facing the inner peripheral surface of the tunnel;
A casting port provided in the mold and used for placing concrete into a space between the inner circumferential surface of the tunnel and the outer circumferential surface of the mold;
Have
A formwork apparatus, wherein the placement opening is provided at a lower end portion of the formwork. The mold is constituted by a plurality of foams connected in the circumferential direction of the tunnel,
The formwork apparatus according to claim 1, wherein the placement port is provided at a lower end portion of the foam located on the lowermost side. A formwork device used for placing concrete on the inner peripheral surface of a tunnel,
An arch-shaped formwork having an outer peripheral surface facing the inner peripheral surface of the tunnel;
A casting port provided in the mold and used for placing concrete into a space between the inner circumferential surface of the tunnel and the outer circumferential surface of the mold;
Have
The mold is constituted by a plurality of foams connected in the circumferential direction of the tunnel,
The casting apparatus is a formwork device provided in a lower half region of the foam located on the lowermost side.   The formwork apparatus of Claim 2 or Claim 3 provided with the hinge mechanism for connecting the said foam | forms adjacent in a tunnel circumferential direction. The placement port is provided on a face plate constituting the outer peripheral surface of the mold,
The formwork device according to any one of claims 1 to 4, wherein the placement opening is provided in a portion of the face plate that is inclined so as to be directed toward the inner side of the tunnel toward the lower side. .   The mold apparatus according to claim 5, wherein at least a part of the face plate is made of resin.   The form plate apparatus according to claim 5 or 6, wherein at least a part of the face plate is transparent.   The formwork apparatus according to any one of claims 1 to 7, wherein the concrete is medium fluidized concrete. A method of constructing lining concrete by placing concrete on the inner peripheral surface of a tunnel using the formwork apparatus according to any one of claims 1 to 8,
Supplying concrete into the space from the placement port,
The step of supplying concrete into the space includes a step in which the top surface of the concrete supplied from the placement port into the space is positioned higher than the placement port and from the placement port to the space. A method of constructing lining concrete, including press-fitting concrete into the wall. Prior to the step of supplying concrete into the space, further comprising the step of connecting a concrete supply pipe to the placement port,
The lining concrete according to claim 9, wherein the step of connecting the concrete supply pipe to the placement opening includes removably connecting the concrete supply pipe to the placement opening using a pressure-resistant pipe joint. How to build.   The method for constructing lining concrete according to claim 9 or 10, wherein in the step of supplying concrete into the space from the placement port, vibration from a vibrator is not applied to the concrete supplied into the space. .