JP2012062667A - Curing method of lining concrete and curing material used in the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curing method of lining concrete, capable of easily processing a curing material so as to be variably matched to a curvature of an inner peripheral surface of an arch-shaped already placed secondary lining concrete structure at low cost, and capable of reliably curing the secondary lining concrete in a short time.SOLUTION: Covering an inner wall surface 12a of an arch-shaped already placed secondary lining concrete structure 12 in a mountain tunnel 11 with a curing material 20 to cure the secondary lining concrete structure 12 constitutes a curing method of lining concrete. The inner wall surface 12a of the secondary lining concrete structure 12 is covered with respective surfaces 21a of a plurality of curing materials 20, of which surface-side shape is variably matched to a curvature of the inner wall surface 12a of the secondary lining concrete structure 12 with determination of a shape and a depth of a plurality of slits 22 arranged on a backside, through a sheet 30. Subsequently, respective rear faces 21b of the curing materials 20 are held with an arch-shaped holding material 40 to complete a curing structure 10 of the lining concrete.

Description

  The present invention relates to a lining concrete curing method suitable for initial curing of, for example, an arched secondary lining concrete that has already been placed in a mountain tunnel, and a curing material used in the method.

  An example of this type of lining concrete curing structure is shown in FIG. As shown in FIG. 12, the lining concrete curing structure includes arcuate balloons 2 and 2 on both sides that delimit predetermined places in the arched secondary lining concrete 1 in a mountain tunnel. The sealing sheet 3 that seals between the balloons 2 and 2 on both sides and the space formed between the inner wall surface 1a of the secondary lining concrete 1 and the balloons 2 and 2 and the sealing sheet 3 on both sides are supplied with air. And a blower pipe 4 for blowing air.

  Then, by creating an air layer between the inner wall surface 1a of the secondary lining concrete 1 and the balloons 2, 2 and the sealing sheet 3 on both sides, the inside is kept warm, and the secondary lining concrete 1 is initially cured. It is like that.

  However, in the conventional lining concrete curing structure, in order to hold the sealing sheet 3 in an arch shape, in addition to the balloons 2 and 2 on both sides made of arch-shaped balloons or the like, a frame made of steel or the like (not shown) is provided. It became indispensable, and in addition to that, the equipment became large, and the weight of the sealing sheet 3 increased, resulting in a complicated overall structure and increased costs.

  In order to cope with this, the applicant of the present patent application has disclosed a lining concrete curing structure capable of curing an arch-shaped secondary lining concrete with a simple structure with a simple structure at a low cost. 1 disclosed.

JP 2006-328869 A JP 2001-123794 A

  However, in the lining concrete curing structure of Patent Document 1, the work of processing the curing material in accordance with the curvature of the inner peripheral surface of the secondary lining concrete is complicated, and a polystyrene foam material is used as the curing material. Therefore, it was fragile when processing, and it was easy to bend or uneven. Therefore, it took skill and time to process the curing material.

  Accordingly, the present invention has been made to solve the above-described problems, and a curing material that can be varied according to the curvature of the inner peripheral surface of an arched secondary lining concrete that has already been placed is simple and low-cost. It is an object of the present invention to provide a lining concrete curing method capable of curing the secondary lining concrete in a short time and a curing material used in the method.

  The invention according to claim 1 is the lining concrete curing method in which the inner peripheral surface of the arched secondary lining concrete that has already been placed is covered with a curing material to cure the secondary lining concrete. The inner peripheral surface of the secondary lining concrete is determined by determining the shape and depth of a plurality of slits provided on the back surface side, and the shape on the front surface side is varied to match the curvature of the inner peripheral surface of the secondary lining concrete. And covering each surface with a plurality of curing materials, and then holding each back surface of the plurality of curing materials with an arch-shaped retaining material to complete a lining concrete curing structure.

  The invention of claim 2 is the lining concrete curing method according to claim 1, wherein each curing material is given a restoring force by using a sheet coated with a surface of each of the plurality of curing materials, The sheet covering the surface of each curing material is pressed against the inner peripheral surface of the secondary lining concrete.

  The invention of claim 3 is the lining concrete curing method according to claim 1, wherein each curing material is provided with water retention performance by using a non-woven fabric covering each surface of the plurality of curing materials, The nonwoven fabric covering the surface of each curing material is pressed against the inner peripheral surface of the secondary lining concrete.

  Invention of Claim 4 is the lining concrete curing method of Claim 1, Comprising: Using the thing which made the space | interval of the slit provided in the back surface side of each said curing material differ, The inside of said secondary lining concrete When the curvature of the peripheral surface is large, a curing material having a narrow interval between the slits is arranged, and when the curvature of the inner peripheral surface of the secondary lining concrete is small, a curing material having a wide interval between the slits is used. It is characterized by arranging.

  A fifth aspect of the present invention is the lining concrete curing method according to the first aspect, wherein a synthetic resin foam is used as the plurality of curing materials.

  The invention according to claim 6 is a curing material used for curing the secondary lining concrete by covering the inner peripheral surface of the existing arch-shaped secondary lining concrete with the curing material body. A plurality of slits extending in parallel in a predetermined direction are formed at predetermined intervals on the back side of the plate-shaped curing material body, and the shape and depth of the plurality of slits are determined. Thus, the shape of the curing material main body is made variable so as to match the curvature of the inner peripheral surface of the secondary lining concrete.

  A seventh aspect of the present invention is the curing material according to the sixth aspect, wherein each of the slits is formed in a wedge shape.

  The invention according to claim 8 is the curing material according to claim 6, wherein each of the slits is formed in a rectangular shape.

  Invention of Claim 9 is a curing material of Claim 6, Comprising: The latching convex part and the latching recessed part are each formed in the circumference | surroundings of the said plate-shaped curing material main body, These latching convex part and latching recessed part The curing material main bodies adjacent to each other are locked with each other.

  A tenth aspect of the present invention is the curing material according to the ninth aspect, characterized in that an engagement concave portion for engaging an arch-shaped holding material is formed on each back surface of the adjacent curing material main body.

  The invention according to claim 11 is the curing material according to claim 6, wherein the curing material body is a synthetic resin foam.

  As described above, according to the invention of claim 1, the inner peripheral surface of the already placed arch-shaped secondary lining concrete is determined by determining the shape and depth of the plurality of slits provided on the back surface side. Cover the surface side shape with each surface of a plurality of curing materials that have been varied to match the curvature of the inner peripheral surface of the secondary lining concrete, then, each back surface of the plurality of curing materials is an arch-shaped holding material By completing the lining concrete curing structure by holding the arch, the arched secondary lining concrete that has already been placed can be cured easily and reliably in a short time at a low cost. Moreover, a plurality of curing materials can be evenly pressed against the inner peripheral surface of the arch-shaped secondary lining concrete that has already been cast with the arch-shaped holding material.

  According to the second aspect of the present invention, by using a material in which each surface of a plurality of curing materials is coated with a sheet, each curing material can have a restoring force, and the surface of each curing material is coated. The sheet can be pressed against the inner peripheral surface of the secondary lining concrete, and the heat insulation effect of the secondary lining concrete surface after placement can be further enhanced, and there is no cracking and high quality secondary covering Engineered concrete can be constructed at low cost. Furthermore, by using a sheet in which the surfaces of a plurality of curing materials are covered with a sheet, the connecting portions between the adjacent curing materials are protected by the sheet, and the gap between the connecting portions between the adjacent curing materials is ensured. The heat retention effect can be further improved.

  According to the invention of claim 3, by using each of the plurality of curing materials coated with a nonwoven fabric, each curing material can be provided with water retention performance, and the surface of each curing material is coated. The non-woven fabric can be pressed against the inner peripheral surface of the secondary lining concrete, and the moisturizing effect, heat insulation and heat retaining effect of the secondary lining concrete surface after placing can be further enhanced, and there is no crack High quality secondary lining concrete can be constructed at low cost. Furthermore, the water retaining effect during curing of the secondary lining concrete can be further enhanced by watering the nonwoven fabric and retaining the water.

  According to invention of Claim 4, when the curvature of the inner peripheral surface of secondary lining concrete is large using what changed the space | interval of the slit provided in the back surface side of each curing material, the space | interval of each slit is When a narrow curing material is arranged and the curvature of the inner peripheral surface of the secondary lining concrete is small, a curing material having a wide interval between the slits is arranged, so that the inner circumference of every curvature of the secondary lining concrete can be obtained. The shape of the surface side of each curing material can be easily and quickly matched to the surface at a low cost.

  According to the invention of claim 5, by using synthetic resin foam as a plurality of curing materials, the slit can be easily processed, and the shape according to the curvature of the inner peripheral surface of the arched secondary lining concrete Can be easily and reliably processed. Moreover, since the synthetic resin foam is lightweight and excellent in heat insulation, the heat retaining effect during curing can be further enhanced.

  According to the invention of claim 6, the curing material body is formed in a plate shape, and a plurality of slits extending in parallel in a predetermined direction are formed on the back side of the plate-shaped curing material body with a predetermined interval, respectively. By determining the shape and depth of the multiple slits and making the shape of the curing material main body variable to match the curvature of the inner peripheral surface of the secondary lining concrete, the arched secondary is already installed. The curing material body can be easily and reliably processed at low cost in a short time in a shape corresponding to the curvature of the inner peripheral surface of the lining concrete.

  According to the invention of claim 7, by forming each slit in a wedge shape, the curing material main body can be easily and quickly reduced in cost in a shape corresponding to the inner peripheral surface of any curvature of the secondary lining concrete. Can be processed.

  According to the invention of claim 8, by forming each slit in a rectangular shape, the curing material body can be easily and quickly reduced in cost in a shape corresponding to the inner peripheral surface of any curvature of the secondary lining concrete. Can be processed.

  According to the invention of claim 9, the locking projections and the locking recesses are formed around the plate-shaped curing material bodies, respectively, and the curing material bodies adjacent to each other through the locking projections and the locking recesses are formed. As a result, the gaps at the connecting portions between adjacent curing materials can be protected and shielded easily and reliably, and the outside air can be reliably and effectively blocked.

  According to the tenth aspect of the present invention, the engagement recesses for engaging the arch-shaped holding material are formed on the back surfaces of the adjacent curing material bodies, so that the arches are formed on the engagement recesses on the back surfaces of the plurality of curing materials. Can be reliably engaged with each other, and each surface of a plurality of curing materials is already placed and in close contact with the inner peripheral surface of the arched secondary lining concrete, or through a minute air layer It can be made to contact reliably.

  According to the invention of claim 11, since the curing material body is a synthetic resin foam, the slit can be easily processed, and the shape according to the curvature of the inner peripheral surface of the arched secondary lining concrete can be easily and Can be processed reliably. Moreover, since the synthetic resin foam is lightweight and excellent in heat insulation, the heat retaining effect during curing can be further enhanced.

It is sectional drawing which shows the lining concrete curing structure of 1st Embodiment of this invention. It is a perspective view of the curing material which used the sheet | seat as a face material used for the curing structure of the said 1st Embodiment. (A) is an expanded sectional view of the slit part of the said curing material, (b) is an expanded sectional view of the slit part of another aspect. It is a fragmentary sectional view which shows the state which changed the said curing material into the circular arc shape through the some slit. It is a perspective view which shows the state which built the curing material changed to the said circular arc shape. (A)-(c) is sectional drawing which shows the procedure until the said curing structure is made. It is explanatory drawing which compared the evaluation of curing by the difference in the groove shape of the slit formed in the said curing material, and the presence or absence of a sheet | seat as a table | surface. It is sectional drawing which shows the lining concrete curing structure of 2nd Embodiment of this invention. (A) is a perspective view of the curing material which used the nonwoven fabric as a face material used for the curing structure of the said 2nd Embodiment, (b) is an expanded sectional view of the slit part of the curing material. It is a fragmentary sectional view which shows the state which changed the curing material of the said 2nd Embodiment in the circular arc shape through several slits. It is a perspective view which shows the state which connected the curing material which varied the space | interval of the said slit. It is a perspective view which shows the conventional lining concrete curing structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a lining concrete curing structure according to a first embodiment of the present invention, FIG. 2 is a perspective view of a curing material using a sheet as a face material used in the curing structure, and FIG. Fig. 3 (b) is an enlarged cross-sectional view of the slit portion of another embodiment, and Fig. 4 is a partial cross-section showing a state where the curing material is changed into an arc shape through a plurality of slits. FIG. 5, FIG. 5 is a perspective view showing a state in which a curing material variable in the shape of the arc is built, FIGS. 6A to 6C are cross-sectional views showing a procedure until the curing structure is formed, and FIG. It is explanatory drawing which compared and evaluated evaluation of the curing by the difference in the groove shape of the slit formed in a curing material, and the presence or absence of a sheet | seat.

  As shown in FIGS. 1 and 6, the lining concrete curing structure 10 is, for example, an inner wall surface (inner peripheral surface) of an arch-shaped secondary lining concrete (covering concrete) 12 that is already placed in a mountain tunnel 11. ) 12a is covered with a panel body (curing material body) 21 of a plurality of synthetic resin foam panels (curing material) 20, and the arched secondary lining concrete 12 is cured. In other words, the inner wall surface 12a of the arch-shaped secondary lining concrete 12 that has already been cast has a plurality of synthetic resin foams that are variable in shape according to the curvature of the inner wall surface 12a of the arch-shaped secondary lining concrete 12. It is covered with a sheet 30 made of a thermoplastic resin as a face material to be affixed to each surface 21a of the panel body 21 of the body panel 20, and the panel body of the plurality of synthetic resin foam panels 20 Each back surface 21b of 21 is held by an arched vinyl chloride pipe (hereinafter abbreviated as “PVC pipe”) 40.

  As shown in FIGS. 2, 4, and 5, the panel body 21 of each synthetic resin foam panel 20 is formed in a rectangular plate shape (plate shape). A plurality of wedge-shaped slits (cuts) 22 extending in parallel to the longitudinal direction are formed on the back surface 21b side of each panel body 21 with a predetermined interval, respectively. The shape of the panel body 21 is made variable so as to follow the curvature of the inner wall surface 12a of the arched secondary lining concrete 12. In addition, an engagement recess 24 is formed in the center of the back surface 21b of each panel body 21 to engage the arched PVC pipe 40. Furthermore, the upper and left sides of each panel body 21 are formed with locking projections 25a as connecting portions, and the right and lower portions of each panel body 21 are formed with locking recesses 25b as connecting portions. It is. The panel main bodies 21 adjacent to each other are locked through the locking projections 25a and the locking recesses 25b.

  As shown in FIG. 5, the width (S) of the panel body 21 of the synthetic resin foam panel 20 is 200 cm, the height (H) is 100 cm, and the thickness (T) is 10 cm, for example. It is. Further, as shown in FIG. 3A, the width (s) of the wedge-shaped slit (isosceles triangle) 22 is, for example, 5 mm and 10 mm, and the depth (h) thereof is, for example, 80 mm, 65 mm, and 50 mm. Different things are available. Furthermore, the distance (L) between the slits 22 is 10 cm and 5 cm, for example. When the panel body 21 of the synthetic resin foam panel 20 is varied in an arc shape so as to match the curvature of the inner wall surface 12a of the arched secondary lining concrete 12 by these slits 22 and 23, the curvature thereof (Radius) is formed to be 1500 to 8000 mm. Here, the curvature refers to a number representing the degree to which the curve is bent, and is defined as the radius of a circle passing through three adjacent points on the curve, that is, the reciprocal of the curvature radius. The straight line has zero curvature, and the curve has a greater curvature as the curvature increases.

  The shape of the slit 22 is not limited to the wedge shape, and may be a rectangular (cross-sectional rectangular) slit (cut) 23 as shown in FIG. A rectangular slit 23 having a width (s) of, for example, 5 mm and a depth (h) of, for example, 65 mm is prepared.

  Further, as shown in FIGS. 2, 4 and 5, a sheet 30 made of thermoplastic resin as a face material is attached to the surface 21a of the panel body 21 of the panel 20 made of synthetic resin foam with an adhesive or the like. It is. The thermoplastic resin sheet 30 is formed in a rectangular shape that is slightly larger than the surface 21a of the panel body 21, and as shown in FIG. 3A, a connecting portion between adjacent panel bodies 21 and 21 ( The connecting portions of the locking projections 25a and the locking recesses 25b of the adjacent panel bodies 21 and 21 are protected by being overlapped on the boundary portion of the connection portion). When the secondary lining concrete 12 is cured, the thermoplastic resin sheet 30 affixed to the surface 21 a of the panel body 21 is pressed against the inner wall surface 12 a of the secondary lining concrete 12. Yes.

  Next, a procedure until the lining concrete curing structure 10 having the above-described configuration is made will be described with reference to FIGS. 6 (a) to 6 (c).

  First, as shown to Fig.6 (a), the rod jack 50 as a support adjustment material is fixed to the both sides on the ground in the mountain tunnel 11. As shown in FIG. Then, both ends of the PVC pipe 40 as a holding material are inserted into the pair of bar jacks 50, 50, and the PVC is placed along the inner wall surface 12a of the arch-shaped secondary lining concrete 12 in the already-placed mountain tunnel 11. The tube 40 is arched. At this time, the bar jack 50 is shrunk to create a space for embedding the synthetic resin foam panel 20 between the inner wall surface 12a of the arched secondary lining concrete 12 and the arched PVC pipe 40. Keep it.

  Next, as shown in FIG. 6 (b), the panel 20 made of synthetic resin foam is inserted between the inner wall surface 12a of the arch-shaped secondary lining concrete 12 and the arch-shaped PVC pipe 40. Panels 20 made of synthetic resin foam are sequentially built in the circumferential direction along the inner wall surface 12a of the secondary lining concrete 12 in the shape of a tube. At this time, the panel main bodies 21 adjacent to each other are locked via the locking convex portions 25a and the locking concave portions 25b formed around the panel main body 21 of the rectangular plastic panel 20 made of synthetic resin. Let Further, the arched PVC pipe 40 is engaged with the engagement recess 24 at the center of each back surface 21 b of each panel body 21.

  And as shown in FIG.6 (c), after installing the panel 20 made from a synthetic resin foam over the perimeter of the circumferential direction along the inner wall surface 12a of the arch-shaped secondary lining concrete 12, A plurality of synthetic resin foam panels 20 are pressed evenly against the inner wall surface 12a of the arch-shaped secondary lining concrete 12 with the arch-shaped PVC pipe 40 by extending the bar jack 50, and these series of operations are performed in an arch-shaped manner. By sequentially performing the process up to the final position behind the secondary lining concrete 12, the lining concrete curing structure 10 shown in FIGS. 1 and 6C is completed.

  In this lining concrete curing structure 10, as shown in FIG. 1, a thermoplastic resin sheet 30 affixed to the surface 21 a of each panel body 21 of a plurality of synthetic resin foam panels 20 has two arch-like shapes. By adhering to the inner wall surface 12a of the next lining concrete 12 or holding it with a minute air layer, moisture deviating from the inner wall surface 12a of the arched secondary lining concrete 12 can be contained. . As a result, the humidity in the vicinity of the inner wall surface 12a of the arched secondary lining concrete 12 is high and is kept moist, and the moisturizing effect is further enhanced.

  Further, a sheet 30 made of thermoplastic resin affixed to the surface 21 a of each panel body 21 of the plurality of synthetic resin foam panels 20 is in close contact with the inner wall surface 12 a of the arched secondary lining concrete 12 or is minute. By holding the air layer, the evaporated water from the inner wall surface 12a of the arch-shaped secondary lining concrete 12 can be sealed. Thereby, the temperature difference between the inside and outside of the arch-shaped secondary lining concrete 12 can be reduced, and the heat insulating and heat retaining effects can be further enhanced.

  According to the lining concrete curing structure 10 of the above-described embodiment, the inner wall surface 12a of the arch-shaped secondary lining concrete 12 in the mountain tunnel 11 is placed inside the arch-shaped secondary lining concrete 12. While covering with a sheet 30 made of a thermoplastic resin that is affixed to the surface 21a of each panel body 21 of a plurality of panels 20 made of synthetic resin foam that has been changed to a shape (for example, an arc shape) according to the curvature of the wall surface 12a, The back surface 21b of each panel body 21 of the plurality of synthetic resin foam panels 20 is held by jacked up arched PVC pipes 40, so that the arched secondary lining concrete 12 can be simplified. The structure can be cured reliably and at low cost. Furthermore, by using the surface 21a of each panel body 21 of a plurality of synthetic resin foam panels 20 covered with a sheet 30 made of thermoplastic resin, a restoring force (returning force) is applied to each panel body 21. The sheet 30 made of thermoplastic resin covering the surface 21 a of each panel body 21 can be pressed against the inner peripheral surface 12 a of the secondary lining concrete 12. By these, the thermal insulation effect of the inner wall surface 12a of the secondary lining concrete 12 after placing can be further enhanced, and a high-quality secondary lining concrete 12 without cracks can be constructed in a short time and at a low cost. can do.

  Further, each panel body 21 of the plurality of synthetic resin foam panels 20 is formed in a rectangular plate shape, and a locking projection 25a and a locking recess 25b are provided around each rectangular plate-shaped panel body 21. The panel main bodies 21 and 21 of the synthetic resin foam panel 20 adjacent to each other are locked through the locking protrusions 25a and the locking recesses 25b, and the panel main bodies 21 and 21 adjacent to each other. By overlapping the boundary portion of the connecting portion (connecting portion) between the locking projection 25a and the locking recess 25b with the end of the thermoplastic resin sheet 30 affixed to the surface 21a of each panel body 21 The gap between the connecting portions of the panel bodies 21 and 21 of the adjacent synthetic resin foam panels 20 can be protected and shielded easily and surely at low cost, and the dissipation of moisture is ensured and effective. To block Tree, can be more further improve the moisturizing effect.

  Furthermore, the plurality of synthetic resin foams are formed by forming the engagement recesses 24 for engaging the arched PVC pipes 40 at the centers of the respective back surfaces 21b of the panel body 21 of the plurality of synthetic resin foam panels 20. The arch-shaped PVC pipe 40 can be reliably engaged with the engagement recess 24 at the center of the back surface 21b of each panel body 21 of the panel 20, and each panel body of the plurality of panels 20 made of synthetic resin foam. The sheet 30 made of the thermoplastic resin affixed to the surface 21a of the 21 can be brought into close contact with the inner wall surface 12a of the arched secondary lining concrete 12 or can be reliably brought into contact with it through a minute air layer.

  Furthermore, a panel 20 made of a synthetic resin foam, in which a plurality of wedge-shaped slits 22 extending in parallel to a predetermined direction are formed on the back surface 21b side of the panel body 21 with a predetermined interval (L) as a plurality of curing materials, respectively. As a result, the surface 21a side of the panel body 21 of each synthetic resin foam panel 20 can be easily and reliably reduced in cost according to the curvature of the inner wall surface 12a of the arched secondary lining concrete 12. Therefore, there is no need to process the curing material, and it is not necessary to process the curing material at the work site.

  Moreover, since the panel 20 made of a synthetic resin foam is lightweight, the panel 20 made of a synthetic resin foam can be easily and entirely formed along the inner wall surface 12a of the arched secondary lining concrete 12 in the circumferential direction. It can be built reliably at low cost. Further, by using a PVC pipe 40 and a bar jack 50 for jacking up the PVC pipe 40 as an arch-shaped holding material, the inner wall surface of the arch-shaped secondary lining concrete 12 is formed by the arch-shaped PVC pipe 40. A plurality of panels 20 made of synthetic resin foam can be pressed evenly onto 12a.

  When curing the arch-shaped secondary lining concrete 12, the groove shape of the slit 22 (23) formed on the back surface 21b side of the panel body 21 of the synthetic resin foam panel 20, the interval L, the sheet 30 The evaluation of variability depending on the presence or absence of is shown in the table of FIG.

  From the table shown in FIG. 7, the groove shape of the slits 22 is a wedge shape, the interval L thereof is 100 mm, the depth h is 65 mm and 50 mm, or the groove shape of the slit 22 is a rectangular shape, and the interval L thereof is It was found that the highest resilience (indicated by “◎” in the table) is obtained when the sheet 30 is 50 mm and the depth h is 62 mm.

  FIG. 8 is a cross-sectional view showing a lining concrete curing structure according to the second embodiment of the present invention, FIG. 9A is a perspective view of a curing material using a nonwoven fabric as a face material used in the curing structure, and FIG. ) Is an enlarged sectional view of a slit portion of the curing material, and FIG. 10 is a partial sectional view showing a state in which the curing material is changed into an arc shape through a plurality of slits.

  In the lining concrete curing structure 10 ′ of the second embodiment, a nonwoven fabric 31 as a face material is attached to the surface 21 a of the panel body 21 of the synthetic resin foam panel 20 as a curing material with an adhesive or the like. In addition, a plurality of rectangular slits (cuts) 23 extending in parallel in the longitudinal direction are formed on the back surface 21b side of each panel body 21 with a predetermined interval L therebetween. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and detailed description thereof is omitted.

  In the second embodiment, a plurality of rectangular slits 23 extending in parallel to the longitudinal direction on the back surface 21b side of the panel body 21 of the plurality of panels 20 made of synthetic resin foam are separated by a predetermined distance (L). By forming, the panel main body 21 can be easily and quickly changed to a shape corresponding to the inner wall surface 12a of any curvature of the arch-shaped secondary lining concrete 12 that has already been placed.

  Further, by using the panel body 21 of the plurality of synthetic resin foam panels 20 in which the nonwoven fabric 31 is attached to each surface 21a with an adhesive or the like, each panel body 21 can be provided with water retention performance, By spraying the nonwoven fabric 31 and retaining the water, the heat retaining effect during curing of the secondary lining concrete 12 can be further enhanced.

  Further, after placing the non-woven fabric 31 affixed to each surface 21a of the plurality of panel bodies 21 by press-contacting with the arched PVC pipe 40 jacked up to the inner wall surface 12a of the secondary lining concrete 12 The moisturizing effect, heat insulating effect and heat retaining effect of the inner wall surface 12a of the secondary lining concrete 12 can be further enhanced, and a high quality secondary lining concrete 12 free from cracks can be constructed.

  FIG. 11 is a perspective view showing a state in which the curing materials having different slit intervals are connected.

  As shown in FIG. 11, each of the synthetic resin foam panels (curing materials) having a slit 22 provided on the back surface 21 b side of the panel main body 21 having an interval L of 10 cm and 5 cm, for example, is locked. While connecting via the convex part 25a and the latching recessed part 25b, the sheet | seat 30 made from a thermoplastic resin is stuck on the surface 21a of each panel main body 21 with the adhesive agent.

  And, for example, in the case of a mountain tunnel 11 made of arched secondary lining concrete 12 as shown in FIG. 1, the curvature of the inner wall surface 12a on the lower side A of both side walls is the smallest, and the ceiling wall side The curvature of the inner wall surface 12a increases in the order of B, the ceiling side wall side C, and the both side wall center side D (curvature: A <B <C <D), but the curvature of the inner wall surface 12a of the secondary lining concrete 12 A panel 20 made of a synthetic resin foam, for example, having a small interval L between the slits 22 is disposed on the side wall center side D, which is the largest place, and the ceiling side wall side C, which has the next largest curvature. A synthetic resin foam having a wide space L between the slits 22 on the lower side A of the side walls where the curvature of the inner wall surface 12a of the secondary lining concrete 12 is the smallest and the next lower ceiling wall side B, for example, 10 cm. Body panel 20 is placed As a result, the shape on the surface 21a side of the panel body 21 of each synthetic resin foam panel 20 can be easily and reliably reduced to the inner wall surface 12a with different curvatures of the arched secondary lining concrete 12 It can be adjusted by changing the cost.

  Thus, the surface 21a is determined by determining the shape and depth of the plurality of slits 22 provided on the back surface 21b side of the inner peripheral surface 12a having different curvatures depending on the location of the arched secondary lining concrete 12 that has already been placed. Thermoplastic resin affixed to the surface 21a of each panel body 21 of a plurality of synthetic resin foam panels 20 whose side shape is varied to match the curvature of the inner peripheral surface 12a of the secondary lining concrete 12 Next, the back surface 21b of the panel body 21 of the plurality of synthetic resin foam panels 20 is held by jacked up arched PVC pipes 40 to complete the lining concrete curing structure 10. By doing so, the already placed and arched secondary lining concrete 12 can be cured easily and reliably in a short time at a low cost.

  Further, each panel 20 made of a plurality of synthetic resin foams on the inner peripheral surface 12a having different curvatures depending on the location of the arched secondary lining concrete 12 that is already placed with the jacked up arched PVC pipe 40. The thermoplastic resin sheet 30 affixed to the surface 21a of the main body 21 can be pressed uniformly and simply. Furthermore, each panel body 21 can be given a restoring force by using the surface 21a of each panel body 21 of the plurality of synthetic resin foam panels 20 covered with a sheet 30 made of thermoplastic resin. At the same time, the sheet 30 made of thermoplastic resin covering the surface 21 a of each panel body 21 can be easily and reliably pressed against the inner peripheral surface 12 a having a different curvature depending on the location of the secondary lining concrete 12. As a result, the heat retaining effect of the inner wall surface 12a with different curvatures can be further increased depending on the location of the secondary lining concrete 12 after placing, and the high-quality secondary lining concrete 12 without cracks can be obtained in a short time. And it can be constructed at low cost.

  In addition, according to each said embodiment, although the case where initial curing of the arch-shaped secondary lining concrete was carried out by the existing placement in a mountain tunnel was demonstrated, the curing object is the secondary covering of the existing placement in a mountain tunnel. For example, the embodiment may be applied to other arched secondary lining concrete such as an arch culvert.

  Moreover, according to each said embodiment, although the panel made from a synthetic resin foam was used as a curing material, you may use another lightweight heat insulating material etc. Synthetic resin foams suitable as this curing material include polystyrene resin foams, polyethylene resin foams, polypropylene resin foams, polyurethane resin foams, etc., especially polystyrene systems with excellent processability and strength. A resin foam is preferred. Examples of the thermoplastic resin sheet to be affixed to the curing material include a polyvinyl chloride sheet, a polyethylene terephthalate sheet, a polyethylene sheet, and a polypropylene sheet. Particularly, a polyvinyl chloride sheet and a polyethylene terephthalate sheet having excellent workability and strength. Is preferred. Furthermore, although a pipe made of vinyl chloride is used as the holding material, a rounded steel angle iron, a resilient glass fiber, a rubber arched air tube which is inflated by injecting air, or the like may be used. .

  Furthermore, according to each said embodiment, although the space | interval of a slit used the curing material of 10 cm and 5 cm, the space | interval of a slit may be 10 cm or more and 5 cm or less, and the rectangular and plate-shaped curing material was used. Of course, a plate-like shape such as a square or rhombus may be used.

10, 10 'Lining concrete curing structure 12 Arched secondary lining concrete 12a Inner wall surface (inner circumferential surface)
20 Panel made of synthetic resin foam (curing material)
21 Panel body (curing material body)
21a surface 21b back surface 22 wedge-shaped slit (slit)
23 Rectangular slit (slit)
24 engaging recess 25a locking projection 25b locking recess 30 thermoplastic resin sheet (face material)
31 Nonwoven fabric (face material)
40 Arched PVC pipe (arched holding material)
50 bar jack (support adjustment material)

Claims (11)

In the lining concrete curing method in which the inner peripheral surface of the arch-shaped secondary lining concrete is covered with a curing material to cure the secondary lining concrete,
The inner peripheral surface of the secondary lining concrete is determined by determining the shape and depth of a plurality of slits provided on the back surface side so that the shape on the front side matches the curvature of the inner peripheral surface of the secondary lining concrete. Covering concrete with a plurality of varied curing materials, and then holding each back surface of the plurality of curing materials with an arch-shaped retaining material to complete a lining concrete curing structure Curing method. The lining concrete curing method according to claim 1,
By using a material in which each surface of the plurality of curing materials is coated with a sheet, each curing material is given a restoring force, and the sheet covering the surface of each curing material is used as an inner periphery of the secondary lining concrete. A lining concrete curing method, characterized by being brought into pressure contact with a surface. The lining concrete curing method according to claim 1,
Using each of the plurality of curing materials coated with a nonwoven fabric to give each curing material water retention performance, the nonwoven fabric covering the surface of each curing material is used as the inner periphery of the secondary lining concrete. A lining concrete curing method, characterized by being brought into pressure contact with a surface. The lining concrete curing method according to claim 1,
When the curvature of the inner peripheral surface of the secondary lining concrete is large, a curing material having a narrow interval between the slits is disposed when the slits provided on the back surface side of the curing material are made different. In addition, when the curvature of the inner peripheral surface of the secondary lining concrete is small, a curing material having a wide interval between the slits is disposed. The lining concrete curing method according to claim 1,
A lining concrete curing method characterized by using a synthetic resin foam as the plurality of curing materials. In the curing material used when curing the secondary lining concrete by covering the inner peripheral surface of the arch-shaped secondary lining concrete with a curing material body,
The curing material main body is formed in a plate shape, and a plurality of slits extending in parallel in a predetermined direction are formed on the back side of the plate-shaped curing material main body with predetermined intervals, and the shape and depth of the plurality of slits are determined. The curing material is characterized in that the shape of the curing material body is determined to be variable so as to match the curvature of the inner peripheral surface of the secondary lining concrete. The curing material according to claim 6,
A curing material, wherein each of the slits is formed in a wedge shape. The curing material according to claim 6,
A curing material, wherein each of the slits is formed in a rectangular shape. The curing material according to claim 6,
A locking projection and a locking recess are formed around the plate-shaped curing material body, and the adjacent curing material bodies are locked with each other via the locking projection and the locking recess. Curing material characterized by The curing material according to claim 9,
A curing material characterized in that an engagement recess for engaging an arch-shaped holding material is formed on each back surface of the adjacent curing material body. The curing material according to claim 6,
A curing material characterized in that the curing material body is a synthetic resin foam.

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