JP2010019067A - Lining concrete curing apparatus and construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lining concrete curing apparatus capable of curing lining concrete in a wet condition with simple structure. <P>SOLUTION: This curing apparatus 10 comprises: a movable frame 12 movable on a track in an extending direction of a tunnel; a shell structure 13 having a cylindrical shell structure with an outer peripheral surface extended almost along the inner peripheral surface of the lining concrete 21, and mounted on the movable frame 12 to approach and separate from the inner peripheral surface of the lining concrete 21; and a moisture retaining curing layer 14 stuck to the outer peripheral surface of the shell structure 13 and having an outer surface that can hold absorbed moisture. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a curing apparatus and a construction method for lining concrete placed on an inner peripheral surface of a tunnel.

In tunnel construction, concrete is blown to the inner wall surface after excavating the tunnel to perform primary lining, and then lining concrete is placed using a slide centle or the like as a secondary lining. If the lining concrete is left as it is after demolding, cracking occurs due to drying shrinkage and the quality deteriorates. Therefore, it is required to moisturize the surface to keep it dry and prevent drying.
Various techniques for moisturizing and curing lining concrete have been proposed. For example, Patent Document 1 discloses a technique for preventing evaporation of moisture by bringing the outer peripheral surface of a balloon that expands in an arch shape by air supply into close contact with the inner wall surface of lining concrete. Patent Document 2 discloses a technique in which watering nozzles are provided at appropriate intervals in a watering pipe formed in an arch shape, and water is sprayed from each watering nozzle toward the inner wall surface of the tunnel.

JP 2005-90146 A JP 2001-248398 A

  The techniques of Patent Documents 1 and 2 can prevent drying of the lining concrete, but devices such as a compressor for supplying air into the balloon and a pump for supplying water to the water spray pipe, Air and water piping facilities are required. Further, the technique of Patent Document 2 requires a drainage facility. For this reason, there is a problem that the equipment for moisturizing and curing is large-scale and the equipment cost is high.

  An object of the present invention is to provide a covering concrete curing apparatus and a method for constructing lining concrete that can cure lining concrete in a wet state with a simple structure.

The present invention is a curing device for covering and curing the inner peripheral surface of the lining concrete placed in the tunnel,
A movable gantry that can move on a track extending in the tunnel extension direction and a cylindrical shell structure having an outer peripheral surface substantially along the inner peripheral surface of the lining concrete, approaching and moving away from the inner peripheral surface of the lining concrete A shell structure mounted on the movable pedestal so that it is possible, and a moisturizing and curing layer having an outer surface attached to the outer peripheral surface of the shell structure and capable of holding absorbed moisture It is characterized by being.

In the curing device of the present invention, a moisture retention curing layer is attached to the outer peripheral surface of the shell structure that can approach and leave the inner peripheral surface of the lining concrete, and this moisture retention curing layer retains absorbed moisture. Since the outer surface of the lining concrete is in a wet state, the shell structure is brought close to the inner peripheral surface of the lining concrete while moisture is absorbed by the outer surface of the moisturizing curing layer. The lining concrete can be cured by covering with the outer surface of the moisturizing layer.
For this reason, it is possible to cure the lining concrete in a wet state with a simple work by a curing device having a simple structure, without deploying equipment such as a large-scale compressor, piping facilities, and drainage facilities.

  The moisturizing and curing layer preferably has a two-layer structure of an inner layer having elasticity that can be deformed in the tunnel radial direction and a void inside, and a moisturizing mat laminated on the outer peripheral surface of the inner layer. . When the inner layer of the moisturizing curing layer is elastic, the moisturizing curing layer is elastically deformed according to the surface shape of the lining concrete when the moisturizing curing layer is brought into contact with the inner peripheral surface of the lining concrete. Can do. Therefore, it becomes possible to bring the moisturizing and curing layer into full contact with the inner peripheral surface of the lining concrete, and the inner peripheral surface of the lining concrete is not damaged. In addition, if the inner layer of the moisture retention curing layer has voids inside, it is possible to ensure heat insulation between the inner space of the tunnel and prevent the occurrence of cracks and the like due to sudden temperature changes. be able to.

  The moisturizing mat is preferably made of a mat having a high moisturizing property capable of ensuring a humidity of 80% or more even after a necessary curing period. Thereby, since the humidity of 80% or more is secured during the curing period, a high curing effect can be obtained.

  The moisture retention mat is laminated on the outer circumferential surface of the water absorbing layer, the water impermeable layer laminated on the inner circumferential surface of the water absorbing layer, and the outer circumferential surface of the water absorbing layer to protect the outer circumferential surface of the water absorbing layer. In addition, it may be composed of a protective layer that is permeable to moisture. By providing the impermeable layer on the inner peripheral surface side of the water absorbing layer, the water absorbed in the water absorbing layer is prevented from leaching out to the inner layer, and the water retaining function in the water absorbing layer can be enhanced. Moreover, by providing a protective layer on the outer peripheral surface side of the water absorbing layer, the surface material of the water absorbing layer will not peel off and adhere to the inner peripheral surface of the lining concrete, and the surface of the lining concrete after curing will be roughened. In addition, the durability of the water absorption layer can be improved and the number of times the diverter is diverted can be increased.

  On the outer peripheral surface of the moisturizing and curing layer, piping for supplying water to the moisturizing and curing layer may be provided. Thereby, it is possible to easily supply moisture to the moisturizing and curing layer.

  The shell structure is configured to be able to bend by elastic deformation into a cylindrical shape substantially along the inner peripheral surface of the lining concrete, and the movable gantry has the shell structure on the inner peripheral surface of the lining concrete. It is preferable to provide a support member that supports in a substantially cylindrical shape. With such a configuration, the shell structure can be bent by elastic deformation in accordance with the shape of the inner peripheral surface of the lining concrete, and the moisturizing and curing layer is more fully contacted with the inner peripheral surface of the lining concrete. The shell structure can be manufactured at a lower cost than the case where the shell structure is manufactured by plastic working in advance according to the shape of the inner peripheral surface of the lining concrete.

  It is preferable that the support member includes an adjustment unit that adjusts the degree of curvature of the shell structure. With such a configuration, it is possible to adjust the degree of curvature of the shell structure in response to an error in the inner peripheral radius of the lining concrete.

  It is preferable that the movable gantry is movable on the same track as a slide centle for placing the lining concrete. With this configuration, there is no need to lay a new track in order to make the curing device movable in the tunnel extension direction.

  The movable gantry includes a jack mechanism for moving the shell structure toward and away from the inner peripheral surface of the lining concrete, and the jack mechanism is a slide for placing the lining concrete. It is preferably arranged at the same position as the central jack mechanism. With such a configuration, the curing device can be set with the same working feeling as when the worker sets the slide centile, and the efficiency of the curing operation can be improved.

In the present invention, after setting a slide centle inside the tunnel and placing the lining concrete, the slide centle is demolded and the inner peripheral side of the hardened lining concrete is cured with the above-described curing device. A method for constructing lining concrete,
A plurality of curing devices having substantially the same length in the tunnel extension direction as the slide centles are prepared behind the slide centles, and a plurality of the lining concretes that have been demolded using the plurality of the curing devices are prepared. It is characterized by being cured simultaneously over the span.

  Normally, it takes about 1 to 2 days from the start of casting of the lining concrete to demolding, and the curing of the lining concrete takes about 5 days, but in the method of the present invention, the demolded lining concrete is spread over multiple spans. Therefore, a sufficient curing period can be secured for all the lining concrete.

  According to the present invention, lining concrete can be cured in a wet state with a simple structure.

It is a front view of the curing device which concerns on the 1st Embodiment of this invention. It is a side view which shows the outer frame member and connection member of the shell structure of the curing apparatus shown by FIG. It is sectional drawing which expands and shows the outer surface panel and moisture retention curing layer of the curing apparatus shown by FIG. It is a figure for demonstrating a secondary lining work and a moisturizing curing work. It is a figure for demonstrating a secondary lining work and a moisturizing curing work. It is sectional drawing which expands and shows the outer surface panel and moisture retention curing layer of the curing apparatus which concern on the 2nd Embodiment of this invention. It is a perspective view which shows the water supply means of the curing apparatus which concerns on the 3rd Embodiment of this invention. It is a front view of the curing device which concerns on the 4th Embodiment of this invention. It is a side view which shows the shell structure of the curing apparatus shown by FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a curing device 10 according to an embodiment of the present invention. The curing device 10 of the present embodiment is for moisturizing and curing the inner peripheral surface of the lining concrete 21 placed on the inner peripheral surface of the tunnel 11 as a secondary lining, and in the extending direction of the tunnel 11. The movable gantry 12 is configured to include a movable gantry 12, a shell structure 13 mounted on the movable gantry 12, and a moisturizing and curing layer 14 provided on the outer peripheral surface of the shell structure 13.

  The movable gantry 12 is configured by framing long members such as a plurality of column members 16, horizontal beam members 17, and vertical beam members 18 made of H-shaped steel, groove-shaped steel, or the like in the tunnel width direction and the tunnel extension direction. Yes. A plurality of wheels 19 are provided at the lower end portion of the movable gantry 12, and the wheels 19 can travel on rails (tracks) 20 laid on the floor surface of the tunnel 11. The rail 20 is also used for running a movable mold (slide centile) 22 (see FIG. 4) used for placing the lining concrete 21.

  The shell structure 13 includes an outer frame member 23 formed in an arch shape substantially along the inner peripheral surface of the tunnel, a plurality of connecting members 24 arranged in parallel along the inner peripheral surface of the outer frame member 23, The outer panel 25 is attached to the outer peripheral surface of the frame member 23. FIG. 2 is a side view of the shell structure 13, and the outer frame member 23 is formed by bending a long member such as H-shaped steel or groove-shaped steel, and a plurality of outer frame members 23 are arranged side by side in the tunnel extending direction. ing. The connecting member 24 is made of a long member such as H-shaped steel or groove-shaped steel, and extends in the tunnel extending direction and connects the plurality of outer frame members 23 to each other.

  FIG. 3 is an enlarged cross-sectional view of the outer panel 25 and the moisturizing and curing layer 14. The outer surface panel 25 is a plate that can be curved along the shape of the outer peripheral surface of the outer frame member 23, for example, a keystone plate having a large number of concave and convex portions arranged along the outer peripheral surface of the outer frame member 23. And a corrugated sheet. And the outer surface panel 25 has covered the whole outer peripheral surface over the some outer frame member 23 arranged in parallel by the tunnel length direction.

  The moisturizing and curing layer 14 includes an inner layer 27 attached to the outer peripheral surface of the outer panel 25 and a moisturizing mat 28 laminated on the outer peripheral surface of the inner layer 27 and has a two-layer structure. The inner layer 27 is made of a foamed member such as a sponge having a void such as closed cells or open cells therein, and has elasticity. The inner layer 27 has a thickness dimension that is larger than the distance between the outer peripheral surface of the shell structure 13 and the inner peripheral surface of the tunnel 11.

The moisture retention mat 28 can absorb moisture and can retain the absorbed moisture, and a conventionally known mat can be used. For example, “Aquamat” (manufactured by Hayakawa Rubber Co., Ltd.), which is a commercially available concrete moisturizing mat, and a concrete curing sheet disclosed in JP-A-2002-81210 can be used. In this moisture retaining mat 28, a plurality of water retaining materials 31 are scattered inside or on the surface of a base material 30 made of a nonwoven fabric or the like, and the back surface side (inner layer 27 side) of the base material 30 is an impermeable film 32 such as a polyethylene film. It's covered. As the water retaining material 31, a polymer such as urethane and a polymer absorbent material can be used.
The moisturizing mat 28 has a performance capable of maintaining a humidity of 80% or more even in a concrete age of 3 weeks, and has a sufficient moisturizing performance for curing the lining concrete 21 requiring about 5 days. .

  As shown in FIGS. 1 and 2, the outer frame member 23 of the shell structure 13 is divided into three parts: an upper part 34 and side parts 36 connected to both sides of the upper part 34 via hinges 35. The side portion 36 of the outer frame member 23 is connected to the vertical beam member 18 of the movable gantry 12 via the first jack mechanism 37, and the first jack mechanism 37 is expanded and contracted to the upper portion 34. On the other hand, it can swing in the width direction. A second jack mechanism 38 is provided in the middle of the column member 16 of the movable frame 12, and the upper portion 34 of the outer frame member 23 connected to the upper end of the column member 16 is provided with the second jack mechanism 38. It can be moved up and down by expanding and contracting. Then, the moisturizing and curing layer 14 can be separated from the inner peripheral surface of the lining concrete 21 by contracting the first jack mechanism 37 and the second jack mechanism 38 (the portion of the side portion 36 in FIG. 1). The moisturizing and curing layer 14 can be brought into contact with the inner peripheral surface of the lining concrete 21 by extending the first jack mechanism 37 and the second jack mechanism 38.

  Hereinafter, the secondary lining work and the curing work by the curing apparatus 10 will be described with reference to FIG. As shown in FIG. 4A, first, the secondary lining work is performed by carrying a movable mold called a slide centle 22 into the tunnel 11 and moving the slide centle 22 in a predetermined manner by running on the rail 20. It is installed at the position (section A) and is performed by placing lining concrete 21 between the outer peripheral surface of the slide center 22 and the inner peripheral surface of the tunnel 11. When the predetermined period elapses and the lining concrete 21 is hardened, the slide centle 22 is removed from the lining concrete 21 and moved to the next section B on the face side to perform secondary lining in the section B.

  As shown in FIG. 4B, in the section A from which the slide centre 22 is removed, the curing device 10 having the same length in the tunnel extension direction as the slide centle is installed, and the lining concrete 21 after placing is placed. Moisturizing and curing. Specifically, as shown in FIG. 1, the first jack mechanism 37 and the second jack mechanism 38 of the curing device 10 are contracted, and the moisturizing and curing layer 14 is separated from the inner peripheral surface of the lining concrete 21. Then, the curing device 10 is installed in the section A. Then, the moisturizing and curing layer 14 is brought into contact with the inner peripheral surface of the lining concrete 21 by extending the first jack mechanism 37 and the second jack mechanism 38.

  When the moisturizing and curing layer 14 is brought into contact with the inner peripheral surface of the lining concrete 21, the lining concrete 21 is cured in a wet state by moisture absorbed by the moisture retaining mat 28. At this time, the inner layer 27 of the moisturizing and curing layer 14 is elastically deformed according to the shape of the inner peripheral surface, whereby the entire moisturizing mat 28 can be brought into contact with the inner peripheral surface of the lining concrete 21, and the lining concrete The whole 21 can be reliably cured in a wet state. Moreover, the inner peripheral surface of the lining concrete 21 is not damaged by the inner layer 27 being elastically deformed.

  Since the period required for placing the lining concrete 21 is shorter than the period required for moisture retention curing, the moisture retention curing in the section A is not completed when the placement of the lining concrete 21 in the section B is completed. Therefore, in this case, if the curing device 10 is moved to the section B following the movement of the slide centile 22 to the section C, the curing period of the section A cannot be sufficiently secured. On the contrary, if the curing device 10 is moved to the section B after the curing period of the section A has elapsed, the curing of the section A can be performed sufficiently, but the start of the curing in the section B is delayed. The delay is accumulated in later sections.

  Therefore, in the present embodiment, the number of curing devices 10 equal to or greater than the value obtained by dividing the period necessary for moisture retention curing by the period necessary for secondary lining is provided behind the slide center 22. For example, if the period required for the secondary lining is 2 days and the period required for the moisturizing curing of the lining concrete 21 is 6 days, 6 days / 2 days = three curing devices 10 are placed in the sliding center. Deploy behind 22 (see FIG. 5). And, when the secondary lining of one section is completed by the slide centle 22, the plurality of curing devices 10 are simultaneously advanced in accordance with the progress of the slide centle 22, and while performing the next secondary lining, Curing of a plurality of sections (spans) is simultaneously performed by each curing device 10. As a result, the three curing devices 10 sequentially move every two days for one section to perform the curing, and the necessary curing period (6 days) can be ensured as a whole.

  FIG. 6 is an enlarged cross-sectional view showing an outer surface panel and a moisturizing curing layer of the curing device according to the second embodiment of the present invention. In the curing device 10 of the present embodiment, the moisture retention mat 28 of the moisture retention layer 14 is laminated on the water absorption layer 42, the inner peripheral surface of the water absorption layer 42, and the water impermeable layer 41 having water impermeability, and the water absorption layer 42. And a protective layer 43 that protects the outer peripheral surface and allows moisture to pass therethrough.

The water absorption layer 42 is configured to be able to absorb moisture and hold the absorbed moisture. Specifically, the water-absorbing layer 42 may be formed in a sheet shape using a highly water-absorbing fiber 42a having a swelling degree of 10 g / g or more as one material. The water absorption layer 42 of the present embodiment is capable of securing a humidity of 80% or more even after the necessary curing period has elapsed, like the moisture retention mat 28 of the first embodiment. For example, Lanseal (registered trademark) (manufactured by Toyobo Co., Ltd.) or Bel Oasis (registered trademark) (Teijin Fibers Ltd.) can be used as the highly water-absorbing fiber. It is desirable to use Lanseal (registered trademark) which has the following advantages.
The swelling purity is measured as follows. First, the fiber is absolutely dried and the weight (X (g)) is measured. Next, the fiber is immersed in pure water for 30 minutes or more, put into a centrifuge having a distance from the center to the sample of 11.5 cm, dehydrated at 1200 rpm for 5 minutes, and the weight after dehydration (Y (g)) is measured. . Then, the swelling purity is obtained by the following equation.
Expansion purity [g / g] = (Y−X) / X

  A highly water-absorbing particulate polymer SAP or the like can be used for the sheet of the water absorption layer 42. However, when this highly water-absorbing particulate polymer SAP is used, even if a protective layer 43 to be described later is provided, the water-absorbing polymer portion swells when the water is sprinkled and absorbed when used, and the lining concrete When separated from the state in contact with the inner peripheral surface of 21, a contact mark may remain on the inner peripheral surface of the lining concrete 21. This is considered to be caused by local variation of the superabsorbent polymer at the time of manufacturing the sheet. However, when the superabsorbent fiber 42a is used for the sheet of the water absorbing layer 42, the fiber can be mixed in the entire sheet. Therefore, even when the water is sprayed and absorbed during use, local swelling does not occur on the sheet. It is possible to prevent contact marks from remaining on the inner peripheral surface of the lining concrete 21 when the whole is uniformly absorbed and separated from the state in which the lining concrete 21 is in contact with the inner peripheral surface.

  The impermeable layer 41 is formed of an impermeable film such as a polyethylene film, for example, and prevents moisture retained by the water absorbing layer 42 from seeping into the inner layer 27. Thereby, the moisture retention function in the water absorption layer 42 can be enhanced.

The protective layer 43 is made of a porous film formed of polyethylene, polypropylene, EVA, vinyl chloride or the like, and includes a large number of fine holes 43a penetrating the front and back surfaces, and allows moisture to pass through the fine holes 43a. It has become.
Further, as the protective layer 43, a non-woven fabric containing hydrophilic fibers other than super absorbent fibers (for example, natural fibers such as cotton and rayon, or hydrophilic polyester subjected to hydrophilic treatment, chemical fibers such as polypropylene) A knitted fabric may be used. When such a hydrophilic fiber is used, there is an advantage that the water transfer due to the water spray to the water absorption layer 42 is faster than the porous film. The water absorption layer 42 can absorb water.

By providing the protective layer 43 on the outer peripheral side of the water absorbing layer 42, the surface of the water absorbing layer 42 can be protected without impairing the moisture retaining function of the lining concrete 21 by the water absorbing layer 42. Therefore, when the moisture retaining mat 28 is separated from the state in which it is in contact with the inner peripheral surface of the lining concrete 21, the contact mark of the water absorbing layer 42 remains on the inner peripheral surface of the lining concrete 21 or the water absorbing layer 42 is formed. The water-absorbing fibers 42a do not peel off and adhere to the lining concrete 21, and the surface of the lining concrete 21 after curing can be prevented from being roughened or the water-absorbing layer 42 can be prevented from prematurely deteriorating. . By preventing early deterioration of the water absorption layer 42, the durability of the moisture retaining mat 28 can be improved, and the number of times the diverter 10 is diverted can be increased. In addition, the protective layer 43 can also be comprised by forming many water-permeable holes in the equivalent water-impermeable film of the water-impermeable layer 41.
In addition, from the viewpoint of moisture retention on the curing surface, it is preferable to directly contact the curing surface and the water absorbing layer, but when the curing is finished, the water absorbing layer is separated from the state in contact with the inner peripheral surface of the lining concrete 21. In order to prevent this, it is very effective to provide the protective layer 43, since adhesion to the curing surface of 42 and deterioration of the water absorption performance of the water absorption layer 42 are likely to occur.

FIG. 7 is a perspective view showing the outer peripheral surface of the curing device according to the third embodiment of the present invention. In this figure, the movable frame 12 is omitted, and only a part of the structure of the shell structure 13 and the moisturizing and curing layer 14 is simplified.
The curing device 10 according to the present embodiment includes water supply means 51 that supplies water to the moisture retention mat 28 of the moisture retention layer 14. The water supply means 51 includes a first water supply pipe 52 disposed on the top of the outer peripheral surface of the moisture retaining mat 28, and two second water supply pipes 53 disposed on both sides in the width direction of the outer peripheral surface of the moisture retaining mat 28. It has.

The first and second water supply pipes 52 and 53 are pipes extending along the tunnel extending direction, and a plurality of discharge holes (not shown) penetrating inward and outward are formed in the pipes over the entire length. Moreover, the 1st, 2nd water supply pipes 52 and 53 are arrange | positioned so that it may not protrude to the radial direction outer side from the outer peripheral surface of the moisture retention mat | matte 28 by bending the moisture retention curing layer 14 to radial direction inner side.
Supply pipes 57 and 54 are connected to the upstream sides of the first and second water supply pipes 52 and 53, respectively, and flow control valves 56 and 55 are provided in the supply pipes 57 and 54, respectively. Then, by operating these flow rate adjusting valves 56 and 55, the flow rate of water discharged from the discharge ports of the first and second water supply pipes 52 and 53 can be adjusted, and the moisture retaining mat 28 is kept in the water retaining state. Accordingly, an appropriate amount of water can be efficiently supplied to the top and both sides in the width direction.

  By providing the water supply means 51 as in the present embodiment, it is possible to supply water easily when the water retention amount of the moisturizing mat 28 is reduced in the process of causing the curing device 10 to proceed in the tunnel 11. Further, by arranging the first and second water supply pipes 52 and 53 along the tunnel extension direction, even if the length of the moisture retaining mat 28 in the tunnel extension direction is long, the number of water supply pipes can be reduced on the face side. Easy water supply. In addition, the number of the water supply pipes 52 and 53 can be changed as appropriate according to the circumferential length and area of the outer peripheral surface of the moisture retaining mat 28.

FIG. 8 is a front view of a curing device according to the fourth embodiment of the present invention. FIG. 9 is a side view showing a shell structure of the curing device shown in FIG.
The curing device 10 of the present embodiment is different from the first embodiment in the configuration of the movable gantry 12 and the shell structure 13. The moisturizing and curing layer 14 can employ the same configuration as that of the first and second embodiments described above, and may include the water absorption means 51 as described in the third embodiment.

  The movable frame 12 frames a plurality of long members such as a lower column member 61, an upper column member 67, a horizontal beam member 62, and a vertical beam member 63 made of H-shaped steel, groove-shaped steel, or the like in the tunnel width direction and the tunnel extension direction. Is made up of. A wheel unit 64 is provided at four positions, front, rear, left, and right, at the lower end of the movable gantry 12, and each wheel unit 64 is provided with two front and rear wheels 19. A lower column member 61 is erected on each wheel unit 64. The front and rear wheel units 64 are connected to each other by a connecting member 65.

  The lower column member 61 can be vertically expanded and contracted by a nested structure, and is expanded and contracted by the jack mechanism 38. The moisturizing and curing layer 14 can be brought into contact with and separated from the inner peripheral surface of the lining concrete 21 by expansion and contraction of the lower column member 61.

  As shown in FIG. 8, three vertical beam members 63 are arranged side by side in the left-right direction, and a plurality of upper column members 67 are erected on the vertical beam member 63 at the center in the front-rear direction. The shell structure 13 is attached to the top of the upper column member 67.

The shell structure 13 is curved in an arch shape so as to be substantially along the inner peripheral surface of the tunnel, and is arranged in parallel in the left-right direction along the inner peripheral surface of the outer frame member 71 and a plurality of outer frame members 71 in the front-rear direction. In addition, a plurality of connecting members 72 extending in the front-rear direction are provided, and a plurality of outer frame members 71 are connected to each other by a plurality of connecting members 72.
The outer frame member 71 is formed of a flexible long bar material, for example, a glass fiber reinforced plastic having high strength, high toughness, and high elasticity. The connecting member 72 is formed from a long circular pipe material. Therefore, the outer frame member 71 and the connecting member 72 of this embodiment are very light compared to the outer frame member 23 and the connecting member 24 of the first embodiment.

  The outer frame member 71 is substantially linear in an unloaded state, and is curved (elastically deformed) in an arch shape so as to substantially follow the inner peripheral surface of the tunnel by support members 73 and 74 provided on the movable frame 12. . The support member 73 is made of a rod member that can be expanded and contracted, and it is possible to adjust the degree of curvature of the upper side of the outer frame member 71 by adjusting the length by an adjustment portion 73a such as a turnbuckle type. Further, the support member 74 is made of a wire member that can be adjusted in length, and can adjust the degree of bending of the lower side of the outer frame member 71 by adjusting the length by an adjustment unit 74a such as a winding type. . In addition, the support member 73 can be configured by a wire member, and the support member 74 can be configured by a rod member. Further, a corrugated outer panel 25 is provided on the outer peripheral surface of the outer frame member 71 as in the first and second embodiments. The outer panel 25 follows the elastic deformation of the outer frame member 71. And can be formed of a lightweight member such as a synthetic resin.

The outer frame member 23 of the first embodiment needs to be plastic processed into an arch shape along the inner peripheral surface of the tunnel in advance, but the outer frame member 71 of the present embodiment is adapted to follow the inner peripheral surface of the tunnel. Therefore, the shell structure 13 can be manufactured at a very low cost. Further, since the degree of curvature of the outer frame member 71 can be adjusted by adjusting the lengths of the support members 73 and 74, it is possible to cope with errors in the inner peripheral radius of the tunnel.
In addition, if the curvature radius of the curvature of the outer frame member 71 is changed by adjusting the length of the support members 73 and 74 or using the support members 73 and 74 having different lengths, it can cope with a plurality of types of tunnels having different inner peripheral radii. It becomes possible.

The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate.
For example, the moisturizing mat 28 of the moisturizing and curing layer 14 is not limited to those exemplified above, and can be appropriately adopted as long as it has a predetermined moisturizing performance. Further, the inner layer 27 of the moisturizing and curing layer 14 is not limited to a foamed member such as a sponge, but can be changed to another member having elasticity. However, when a foamed member having a gap inside is used as in the present embodiment, a sudden temperature change of the lining concrete 21 can be avoided due to the heat insulation by the gap, and cracks and the like caused by the temperature change can be avoided. Occurrence can be prevented.

  In general, the slide center 22 is provided with a jack mechanism for moving its outer surface toward and away from the inner peripheral surface of the tunnel 11 in order to demold from the lining concrete 21. And the curing apparatus 10 of this invention can arrange | position the 1st jack mechanism 37 and the 2nd jack mechanism 38 in the same position as the jack mechanism of the slide center 22. In this way, the curing device 10 can be set inside the tunnel 11 with the same work feeling as setting the slide centile 22 inside the tunnel 11, and the efficiency of the curing work can be improved. .

DESCRIPTION OF SYMBOLS 10 Curing apparatus 11 Tunnel 12 Moving mount 13 Shell structure 14 Moisturizing curing layer 21 Covering concrete 22 Slide center 27 Inner layer 28 Moisturizing mat 41 Impervious layer 42 Water absorbing layer 43 Protective layer 52 First water supply pipe 53 Second water supply Pipe 73 Support member 73a Adjustment part 74 Support member 74a Adjustment part

Claims (10)

A curing device for covering and curing the inner peripheral surface of lining concrete placed inside a tunnel,
A movable gantry that can move on the track in the tunnel extension direction;
A shell structure that has a cylindrical shell structure having an outer peripheral surface substantially along an inner peripheral surface of the lining concrete, and is mounted on the movable frame so as to be able to approach and leave the inner peripheral surface of the lining concrete. Body,
A curing apparatus for lining concrete, comprising: a moisturizing and curing layer having an outer surface that is attached to an outer peripheral surface of the shell structure and can retain absorbed moisture.   The moisture retention curing layer has a two-layer structure of an inner layer having elasticity that can be deformed in a tunnel radial direction and a void inside, and a moisture retention mat laminated on the outer peripheral surface of the inner layer. Curing equipment for lining concrete described in 1.   The lining concrete curing device according to claim 2, wherein the moisture retention mat is made of a mat having high moisture retention that can ensure a humidity of 80% or more even after a necessary curing period.   The moisture retaining mat is laminated on the outer circumferential surface of the water absorbing layer, the water impermeable layer laminated on the inner circumferential surface of the water absorbing layer, and the outer circumferential surface of the water absorbing layer to protect the outer circumferential surface of the water absorbing layer. The lining concrete curing device according to claim 2 or 3, comprising a protective layer capable of transmitting moisture.   The lining concrete curing device according to any one of claims 1 to 4, wherein a pipe for supplying water to the moisture retention curing layer is disposed on an outer peripheral surface of the moisture retention curing layer.   The shell structure is configured to be able to bend by elastic deformation into a cylindrical shape substantially along the inner peripheral surface of the lining concrete, and the movable gantry has the shell structure on the inner peripheral surface of the lining concrete. The curing apparatus for lining concrete according to any one of claims 1 to 5, further comprising a support member that supports the cylindrical shape substantially along.   The lining concrete curing apparatus according to claim 6, wherein the support member includes an adjustment unit that adjusts the degree of curvature of the shell structure.   The lining concrete curing device according to any one of claims 1 to 7, wherein the movable frame is movable on the same track as a slide centle for placing the lining concrete.   The movable gantry includes a jack mechanism for bringing the shell structure into and out of contact with the inner peripheral surface of the lining concrete, and the jack mechanism is a slide centle jack for placing the lining concrete. The lining concrete curing device according to any one of claims 1 to 8, which is disposed at the same position as the mechanism. 6. The inner peripheral side of the hardened lining concrete is set to any one of claims 1 to 5 after setting the slide centle inside the tunnel and placing the lining concrete, then removing the slide centle and setting the inner periphery side of the hardened lining concrete. It is a construction method of lining concrete that is cured with a curing device of
A plurality of curing devices having substantially the same length in the tunnel extension direction as the slide centles are prepared behind the slide centles, and the lining concrete that has been demolded using the plurality of the curing devices is prepared. A method for constructing lining concrete, characterized by curing simultaneously over a plurality of spans.

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