JP2007231517A - Curing equipment for curing lining concrete for tunnel, molded by travelling form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide curing equipment which efficiently cures lining concrete while preventing the lining concrete from being cracked because the temperature of the lining concrete drops due to cooling by water or vapor for use in curing. <P>SOLUTION: The curing equipment for curing the lining concrete for a tunnel, which is molded by using a moving type form, comprises: a first curing unit which is arranged along the axis of the tunnel so as to cure the lining concrete without adding moisture; and a second curing unit which is arranged along the axis of the tunnel so as to cure the lining concrete by adding the moisture. The first curing unit comprises a first carriage, a first frame which is fixed to the first carriage, and a first curing means which is fixed to the first frame. The second curing unit comprises a second carriage, a second frame which is fixed to the second carriage, and a second curing means which is fixed to the second frame. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a curing facility for curing tunnel lining concrete formed using a mobile formwork.

  In a tunnel in which lining concrete is formed using a mobile formwork, the mobile formwork is moved along with the excavation of the tunnel. Demold early. For this reason, after leaving the mold, if the lining concrete is left without being cured, the lining concrete dries relatively quickly, so that the hydration reaction of the lining concrete is not sufficiently performed, Cracking occurs due to drying shrinkage of the engineered concrete. Therefore, after demolding, the covering concrete is cured by applying moisture such as water or steam to prevent the covering concrete from drying.

A conventional curing method for tunnel lining concrete formed using a movable formwork is to supply water to the surface of the lining concrete by spraying water, and a water-permeable mat on the surface of the lining concrete. And supplying water to the surface of the lining concrete through the water-permeable mat (see Patent Document 1) and supplying water to the surface of the lining concrete (see Patent Document 2). Further, the curing equipment for curing the lining concrete by supplying steam includes a carriage movable in the axial direction of the tunnel, a frame fixed to the carriage, and the lining attached to the frame. Some include a humidifier that supplies steam to the concrete surface (see Patent Document 2).
Japanese Patent Laid-Open No. 10-102773 JP 2000-73696 A

  By the way, the temperature of the lining concrete rises due to a hydration reaction after the lining concrete is placed, and becomes the highest after about 12 hours to about 26 hours after the placing of the lining concrete. That is, the temperature of the lining concrete at the time of demolding is the highest. For this reason, when the lining concrete is cured immediately after demolding, the lining concrete is cooled by water or steam used for curing, and the temperature of the lining concrete is determined by the temperature of the lining concrete. It drops very quickly compared to the case where moisture is not given to concrete. This causes a problem that cracking occurs in the lining concrete and the quality of the lining concrete is deteriorated.

  An object of the present invention is to efficiently cure the lining concrete without causing cracking of the lining concrete due to a decrease in temperature of the lining concrete due to cooling with water or steam used for curing. It is to provide a curing facility that can.

  The present invention provides a first curing device disposed along the axis of the tunnel for curing the lining concrete without applying moisture, and a second curing device for curing the lining concrete by applying moisture. It is characterized by including.

  According to the present invention, a curing equipment for curing tunnel lining concrete formed using a mobile formwork is disposed along the axis of the tunnel, and the curing of the lining concrete without applying moisture is performed. A first curing device to perform and a second curing device to perform moisture curing of the lining concrete. The first curing device includes a first carriage movable in the axial direction of the tunnel, a first frame fixed to the first carriage, and a first curing means fixed to the first frame. The second curing device has a second carriage movable in the axial direction of the tunnel, a second frame fixed to the second carriage, and fixed to the second frame. A second curing means.

  Since the first curing device that cures the lining concrete without applying moisture and the second curing device that cures the lining concrete by applying moisture are arranged along the axis of the tunnel, By moving the curing equipment along the axis of the tunnel, it is possible to sequentially perform curing performed without applying moisture and curing performed with moisture applied to the lining concrete after demolding. Prior to curing the lining concrete by applying moisture, by curing the lining concrete without applying moisture, during the curing of the lining concrete without applying moisture, water or The temperature of the lining concrete can be lowered over time without cooling the lining concrete with steam. Thereby, generation | occurrence | production of the crack of the said lining concrete resulting from the temperature of the said lining concrete falling by the cooling by the water or steam used for curing can be prevented.

  The ratio between the length of the first curing device and the length of the second curing device is the number of days and moisture required for curing the lining concrete without applying moisture, and curing the lining concrete. It can be a ratio to the number of days required to perform The ratio of the length of the first curing device and the length of the second curing device corresponds to the ratio of the curing period by the first curing device and the curing period by the second curing device. For this reason, the number of days and moisture required for curing the lining concrete without giving moisture to the ratio between the length of the first curing device and the length of the second curing device in advance are given to the lining. By setting the ratio to the number of days required for curing the concrete, the lining concrete can be cured more efficiently. The ratio of the length of the first curing device to the length of the second curing device can be 1: 2.

  The first curing means includes a sheet cradle having a shape corresponding to the surface shape of the lining concrete, connected to the first frame, and the lining concrete attached to the sheet cradle. And a water-impermeable sheet covering the surface. By covering the surface of the lining concrete with the water-impermeable sheet, moisture can be prevented from escaping from the surface of the lining concrete, and drying of the lining concrete can be prevented.

  The second curing means includes a mat base connected to the second frame and having a shape corresponding to the surface shape of the lining concrete, and the lining concrete attached to the mat base. A water-permeable mat for supplying water to the surface can be provided, and the second curing device can be provided with lifting means for lifting and lowering the second carriage. The water permeable mat can be brought into close contact with the surface of the lining concrete by raising the second carriage by the elevating means. By supplying water to the water permeable mat in a state where the water permeable mat is in close contact with the surface of the lining concrete, water can be supplied to the surface of the lining concrete through the water permeable mat. Further, when the second curing device is moved, the adhesion of the water-permeable mat can be released by lowering the second carriage by the elevating means. The lifting means may be a plurality of jacks each having one end fixed to the second carriage and the other end directed to the ground.

  The mat cradle includes a top portion having a shape corresponding to the shape of the arch portion of the tunnel, and a first side portion and a second side portion having shapes corresponding to the shapes of the left and right side wall portions of the tunnel. A first side portion pivotally attached to one end of the top portion and a second side portion pivotally attached to the other end of the top portion, wherein the second curing device includes the first side portion. First rotating means for rotating a side part with respect to the top part and second rotating means for rotating the second side part with respect to the top part may be provided. The first rotating means and the second rotating means, together with the elevating means, are used for bringing the water-permeable mat into close contact with the surface of the lining concrete or releasing the close contact. The first rotating means is a jack having one end connected to the first side and the other end connected to the second frame, and the second rotating means has one end connected to the second side. A jack connected to the second portion and connected to the second frame at the other end.

  The second curing means may include a pipe attached to the second frame and having a watering nozzle at the tip for watering the surface of the lining concrete. The second curing means may include a humidifier attached to the second frame for supplying steam to the surface of the lining concrete.

  According to the present invention, by moving the curing facility along the axis of the tunnel, the lining concrete after demolding is sequentially subjected to curing performed without applying moisture and curing performed with moisture applied. Can do. Thus, the lining concrete can be efficiently cured without generating cracks in the lining concrete due to a decrease in the temperature of the lining concrete due to cooling with water or steam used for curing. .

  As shown in FIG. 1, the curing equipment 16 for curing the lining concrete 14 of the tunnel 12 formed by using the movable mold 10 is a first method for curing the lining concrete 14 without applying moisture. And a second curing device 20 for curing the lining concrete 14 by applying moisture.

  As shown in FIG. 2, the first curing device 18 includes a first carriage 22, a first frame 24 fixed to the first carriage, and a seat pedestal connected to the first frame. 26 and a water-impermeable sheet 28 attached to the sheet cradle.

  The first carriage 22 includes a pair of first carriage girders 22a and 22b each extending in the axial direction of the tunnel 12, and a plurality of first wheels 22c each attached to one first carriage girder 22a. And a plurality of second wheels 22d attached to the other first bogie beam 22b. The first wheel 22c moves on the first rail 30a, and the second wheel 22d moves on the second rail 30b. The rails 30 a and 30 b are installed on the bottom concrete 12 b provided in the invert portion 12 a of the tunnel 12.

  The first frame 24 includes a plurality of first frame members 32 each including a pair of columns 32a and 32b and a cross beam 32c connecting the columns. Each first frame member 32 is disposed on the first carriage 22, one column 32 a is fixed to one first carriage beam 22 a, and the other column 24 b is fixed to the other first carriage beam 22 b. Yes.

  The sheet pedestal 26 has a shape corresponding to the surface shape of the lining concrete 14, and a plurality of upwardly convex first arch girders 26 a arranged along the axis of the tunnel 12, each of which is the first A plurality of first horizontal girders 26b connected to the arch girder and extending in the axial direction of the tunnel 12; Each first arch girder 26 a is fixed to each first frame member 32. The first frame 24 has one end connected to one of the first frame members 32 and the other end connected to one of the first arch girders 26a in order to firmly fix the first arch girders 26a. A plurality of coupled first fixing members 24a can be provided.

  The water-impermeable sheet 28 is disposed on the sheet receiving base 26 so as to cover the surface of the lining concrete 14, and is fixed and fixed to the arch girder 26a or the first horizontal girder 26b. The water-impermeable sheet 28 can be a vinyl sheet.

  Further, in the example shown in FIG. 1, the first curing device 18 is a first closing means 34 and a second closing means 36 arranged at intervals along the axis of the tunnel 12, A first closing means 34 for closing a gap between one end portion of the water permeable sheet 28 in the axial direction of the tunnel 12 and the lining concrete 14, and a gap between the other end portion of the water-impermeable sheet 28 and the lining concrete 14. Second closing means 36 for closing.

  The first closing means 34 is a first balloon 34 a made of rubber that presses the one end portion of the water-impermeable sheet 28 against the lining concrete 14, and the second closing means 36 is the other of the water-impermeable sheet 28. This is a second balloon 36 a made of rubber that presses the end against the lining concrete 14. The first balloon 34 a is disposed between the one end portion of the water-impermeable sheet 28 and the arch girder 26 a ′ located below the one end portion of the water-impermeable sheet 28, and is fixed to the arch beam. . The second balloon 36a is disposed between the other end portion of the water-impermeable sheet 28 and the arch girder 26a "positioned below the other end portion of the water-impermeable sheet 28, and is fixed to the arch beam. ing.

  The gap between the end portions of the water-impermeable sheet 28 and the lining concrete 14 is blocked by, for example, fixing the end portions of the water-impermeable sheet 28 with fixing means (not shown) such as a nail. It can also be carried out by fixing to. Thus, when not using the 1st, 2nd obstruction | occlusion means 34 and 36, the 1st curing device 18 does not need to have the 1st and 2nd obstruction | occlusion means 34 and 36. FIG.

  As shown in FIG. 3, the second curing device 20 includes a second carriage 38, a second frame 42 fixed to the second carriage, and a mat base connected to the second frame. 44, a water-permeable mat 46 attached to the mat base, and an elevating means 40 for raising and lowering the second carriage 38.

  Similarly to the first carriage 22, the second carriage 38 includes a pair of second carriage girders 38a and 38b each extending in the axial direction of the tunnel 12, and a plurality of second carriage girders 38a each attached to one second carriage girder 38a. It has the 3rd wheel 38c and the some 4th wheel 38d each attached to the other 2nd bogie beam 38b (FIG. 1). The third wheel 38c moves on the first rail 30a, and the fourth wheel 38d moves on the second rail 30b.

  The elevating means 40 has a first jack 40 a and a second jack 40 b that are arranged at intervals in the transverse direction of the tunnel 12. One end of the first jack 40a is fixed to one second carriage girder 38a and the other end is directed to the ground, and one end of the second jack 40b is fixed to the other second carriage girder 38b, The other end is directed to the ground. The first jack 40 a and the second jack 40 b are used to bring the water-permeable mat 46 into close contact with the surface of the lining concrete 14 or release the close contact.

  Similar to the first frame 24, the second frame 42 includes a plurality of second frame members 48 each including a pair of columns 48 a and 48 b and a cross beam 48 c connecting the columns. Each second frame member 48 is disposed on the second carriage 38, one column 48a is fixed to one second carriage beam 38a, and the other column 48b is fixed to the other first carriage beam 38b. Yes.

  The mat cradle 44 has a shape corresponding to the surface shape of the lining concrete 14, and a plurality of upwardly projecting second arch girders 50 arranged along the axis of the tunnel 12, each of which is the second. And a plurality of second horizontal girders 52 connected to the arch girder and extending in the axial direction of the tunnel 12. Each second arch girder 50 is fixed to each second frame member 48. The second frame 42 has one end connected to one of the second frame members 48 and the other end connected to one of the second arch girders 50 in order to firmly fix the second arch girders 50. A plurality of second fixing members 42a connected may be provided.

  The mat support 44 corresponds to the shape of the top portion 50a having a shape corresponding to the shape of the arch portion 12c of the tunnel 12 and the shape of the first side wall portion 12d of the tunnel 12 pivotally attached to one end of the top portion. The first side portion 50b has a shape, and the second side portion 50c has a shape corresponding to the shape of the second side wall portion 12e of the tunnel 12 and is pivotally attached to the other end of the top portion 50a.

  The second curing device 20 includes a first rotation means 54 and a second side portion 50c, which are spaced apart in the transverse direction of the tunnel 12 and rotate with respect to the top portion 50a. Second rotating means 56 for rotating with respect to. The first rotating means 54 is a third jack 54 a having one end connected to the first side portion 50 b and the other end connected to one pillar 48 a of the second frame 42, and the second rotating means 56. Is a fourth jack 56 a having one end connected to the second side portion 50 c and the other end connected to the other column 38 b of the second frame 42.

  The third jack 54a and the fourth jack 56a are used for bringing the water permeable mat 46 into close contact with the surface of the lining concrete 14 together with the lifting means 40 or releasing the close contact. When the close contact of the water permeable mat 46 and the release of the close contact are performed only by the lifting and lowering of the second carriage 38 by the lifting and lowering means 40, the side portions 50b and 50c of the mat receiving base 44 are rigidly coupled to the top portion 50a, The second curing device 20 may not have the first and second rotating means 54 and 56.

  The water permeable mat 46 is disposed so as to cover the surface of the lining concrete 14, and is fixed to the second arch girder 50 or the second horizontal girder 52 by a fixing means (not shown) such as a clamp. As shown in FIG. 4, the water permeable mat 46 has a water permeable sheet 46 a such as a non-woven fabric to be in close contact with the surface of the lining concrete 14, and a hole attached to the water permeable sheet and extending in the axial direction of the tunnel 12. It has a water supply pipe 46b and a plywood 46c to which a water-permeable sheet 46a is bonded. The water supply pipe 46b is disposed at the highest position of the water permeable mat 46, and the water supplied by the water supply pipe 46b is supplied to the water permeable sheet 46a through the hole 46b 'of the water supply pipe, and then flows down. It is supplied to the surface of the lining concrete 14 through the water permeable sheet 46a. In order to increase the amount of water supplied to the surface of the lining concrete 14, the water-permeable mat 46 can include a plurality of other water supply pipes (not shown) in addition to the water supply pipe 46b.

  In the example shown in FIG. 5, the second curing device 58 is replaced with the example of FIG. 62. The watering nozzle 60 is used for watering the surface of the lining concrete 14. The pipe 62 is fixed to an attachment member 64 connected to the second frame 42. The number of the pipes 62 can be changed according to the amount of water supplied to the surface of the lining concrete 14.

  In the example shown in FIG. 6, the second curing device 66 has a plurality of humidifiers 68 instead of the example of FIG. The humidifier 68 is fixed to an attachment member 64 connected to the second frame 42 and is used to supply steam to the surface of the lining concrete 14. Further, the second curing device 66 can include a cover 70 that covers the surface of the lining concrete 14 in order to efficiently maintain the wet state of the surface of the lining concrete 14. In this case, the humidifier 68 is disposed between the cover 70 and the lining concrete 14. The cover 70 is fixed to a cover cradle 72 having a shape corresponding to the surface shape of the lining concrete 14, and the cover cradle 72 is connected to the second frame 42. The cover 70 can be a water-impermeable sheet such as a vinyl sheet.

  In the example shown in FIG. 1, the length 74 of the first curing device 18 is 10.5 m, which is the length of the mobile formwork 10, that is, the length of the lining concrete 14 to be driven at a time. The length 76 of the second curing device 20 is 21.0 m, which is twice the length 74 of the first curing device 18. In the illustrated example, the second curing device 20 has a front half 78 and a rear half 80 each having the same length. The front half 78 and the rear half 80 are connected by a connecting member 82.

  When curing the lining concrete 14, as shown in FIG. 1, first, the first curing device 18 is arranged behind the movable mold 10 in the excavation direction of the tunnel 12 (left side of the drawing), and the wire rope It connects with the movable formwork 10 by the connection means 84 like this. Next, the second curing device 20 is disposed behind the first curing device 18 (left side of the drawing).

  The first part of the lining concrete 14 is formed by the movable mold 10, and after the mold is removed, the movable mold 10 is moved forward (to the right in the drawing) by the length, thereby the first part. The curing device 18 is moved to the position of the first part. Thereby, the water-impermeable sheet 28 of the 1st curing apparatus 18 is arrange | positioned in the said 1st part. The movement of the first curing device 18 may be performed by a towing vehicle (not shown) such as a truck in addition to the movable mold 10.

  Next, the gap between the peripheral edge of the water-impermeable sheet 28 and the first portion is closed so as not to allow moisture to escape from the surface of the first portion. Of the peripheral edge of the water-impermeable sheet 28, the two end portions in the axial direction of the tunnel 12 are blocked by injecting air into each of the first balloon 34a and the second balloon 36a. One end portion of the sheet 28 is performed by pressing the other end portion of the water-impermeable sheet 28 against the first portion with the second balloon 36a (FIG. 1). As shown in FIG. 2, the two ends in the circumferential direction of the tunnel 12 are blocked by placing weights 86 such as a plurality of woods on the respective ends of the water-impermeable sheet 28 in the first portion or This is done by pressing against the bottom concrete 12b. In this way, the surface of the first portion is covered with the water permeable sheet 28. In this state, the first portion is cured without applying moisture.

  During the curing of the first part without applying moisture, the surface of the first part is isolated from the air flowing through the tunnel 12 by the water permeable sheet 28 to prevent the drying of the first part. However, the temperature of the first portion can be lowered over time. By preventing drying of the first part, the effect of exerting strength on the first part can be enhanced. Further, by lowering the temperature of the first part, when the first part is cured by applying water or steam later, the first part is prevented from being cooled by the water or the steam. be able to. Thereby, it can prevent that a crack generate | occur | produces in the said 1st part by the cooling by the said water or the said steam. In order to sufficiently reduce the temperature of the first part, it is desirable that the period of curing the first part without applying moisture is at least about 24 hours.

  While the first portion is cured by the first curing device 18, the second portion of the lining concrete 14 is molded by the movable mold 10. After the molding of the second part by the movable mold 10, the movable mold 10 and the first part corresponding to the length of the movable mold 10 are the same as when the molding of the first part is finished. The curing device 18 is moved.

  Next, the second curing device 20 is moved so that the first half 78 of the second curing device 20 is arranged in the first part after the curing by the first curing device 18 is completed. The second curing device 20 is moved by towing with a towing vehicle (not shown) such as a truck. When the force required to pull the second curing device 20 is relatively small, the second curing device 20 is connected to the first curing device 18 and the second curing device 20 is moved together with the first curing device 18. You may let them. The movement of the second curing device 20 is performed in a state where the third jack 54a and the fourth jack 56a are contracted and the second carriage 38 is lowered.

  After the second curing device 20 is moved, the second carriage 38 is raised by the first jack 40a and the second jack 40b (FIG. 3). At this time, an inverted U-shape placed on the bottom concrete 12b under the first jack 40a so as to straddle the first rail 30a so that the jacks 44a, 44b do not contact the rails 30a, 30b. A first pedestal 88 is disposed, and a second U-shaped second pedestal 90 placed on the bottom concrete 12b so as to straddle the second rail 30b is disposed under the second jack 40b. To do. When the second carriage 38 rises, the first jack 40a receives a reaction force from the bottom concrete 12b via the first pedestal 88, and the second jack 40b passes from the bottom concrete 12b via the second pedestal 90. This is done by receiving a reaction force.

  Thereafter, the third jack 54a is extended so as to rotate the first side portion 50b of the mat base 44 toward the first side wall portion 12d of the tunnel 12, and the second side portion 50c of the mat base 44 is tunneled. The fourth jack 56a is extended so as to rotate toward the 12th second side wall portion 12e. Thus, the water-permeable mat 46 is brought into close contact with the surface of the first portion by the rising of the second carriage 38 and the rotation of the first and second side portions 50b and 50c of the mat receiving base 44.

  After the water permeable mat 46 is brought into close contact with the surface of the first portion, water is supplied to the water supply pipe 46 b of the water permeable mat 46. The water supplied by the water supply pipe 46b is supplied to the water permeable sheet 46a through the hole 46b 'of the water supply pipe, and then supplied to the surface of the first portion through the water permeable sheet 46a. By supplying water to the surface of the first portion, curing of the first portion can be promoted, and sufficient strength can be given to the first portion.

  While the first portion 78 is cured by the first half portion 78 of the second curing device 20, the second portion is cured by the first curing device 18, and the lining concrete 14 is moved by the movable mold 10. The third part is molded. After the molding of the third part by the movable mold 10, the movable mold 10, the first is the same as the length of the movable mold 10 as in the case of the molding of the second part. The second curing device 18 and the second curing device 20 are moved.

  When the second curing device 20 is moved, the third jack 54a and the fourth jack 56a are contracted, and the second carriage 38 is lowered by the first jack 40a and the second jack 40b. Thereby, the adhesion of the water-permeable mat 46 is released.

  Due to the movement of the second curing device 20, the latter half 80 of the second curing device 20 is arranged in the first portion after the curing by the first half 78 of the second curing device 20. Thereafter, as with the first half portion 78 of the second curing device 20, the first portion is cured by applying humidity to the second half portion 80 of the second curing device 20. In this manner, the first curing device 18 and the second curing device 20 are sequentially moved to cure the lining concrete 14.

  In the illustrated example, since the length of the second curing device 20 is twice the length of the first curing device 18, the curing period of the first portion by the second curing device 20 is the first The curing period of the first portion by the curing device 18 is twice as long. For example, when the curing period of the first part by the first curing apparatus 18 is 2 days, the curing period of the first part by the second curing apparatus 20 is 4 days. Thus, the ratio between the length of the first curing device 18 and the length of the second curing device 20 corresponds to the ratio between the period for curing without applying moisture and the period for performing curing with moisture. . Therefore, the ratio between the length of the first curing device 18 and the length of the second curing device 20 is a ratio of the number of days required for curing performed without applying moisture to the number of days required for curing performed with moisture. Thus, the lining concrete 14 can be efficiently cured.

  For the curing performed by applying moisture, the second curing device 20 having the water permeable mat 46 is used instead of the example of FIGS. The curing device 58 can be used. In this case, the curing of the first part is performed by supplying water to the pipe 62 and spraying the surface of the first part through the watering nozzle 60. Further, for curing performed by applying moisture, the second curing device 58 having the humidifier 68 shown in FIG. 6 is used instead of the example of FIG. 5 using the second curing device 58 having the pipe 62 having the watering nozzle 60. A curing device 66 can be used. In this case, curing of the first part is performed by supplying steam to the surface of the first part by the humidifier 68.

  In the curing method of curing the lining concrete 14 after curing the lining concrete 14 without applying moisture, the lining concrete is also performed while curing the lining concrete 14 without applying moisture. 14 can be prevented from drying. For this reason, the hydration reaction of the lining concrete 14 can be promoted, and the lining concrete 14 can exhibit sufficient strength. According to the experiment confirming the effect of exerting strength on the concrete by the curing method, the concrete is exhibited the compressive strength equivalent to the case of curing without demolding by curing the concrete by the curing method. be able to.

  The experiment was performed using three concrete specimens with different curing methods after demolding. Each specimen was demolded at the age of 2 days, and the first specimen was not cured after demolding. The second specimen was cured for 2 days without dehumidification after demolding, and then cured for 4 days with moisture. The third specimen was cured for 4 days without dehumidification after demolding, and then cured for 2 days with moisture. Curing without applying moisture was performed by covering the surface of the concrete with a vinyl sheet, and curing with applying moisture was performed by supplying water to the surface of the concrete. The size of each specimen is 30 cm in length, 30 cm in width, and 30 cm in height.

  In the experiment, the compressive strength of each of the specimens with a material age of 29 days from the surface of the concrete having a depth of 0 cm to 5 cm, a portion of 5 cm to 10 cm, and a portion of 10 cm to 15 cm was measured, and the measured value was Comparison with standard intensity. The standard strength is the compressive strength of a concrete specimen cured without demolding until the age of 28 days.

  According to FIG. 7 showing the ratio of the compressive strength of each part of each specimen to the standard strength, the average value of the ratio of the second specimen is 0.99, and the average value of the ratio of the third specimen is 1.06, and the compressive strength of the second specimen and the third specimen is substantially equal to the standard strength. As described above, after the concrete is cured without applying moisture, the concrete can exhibit sufficient strength by a curing method in which the concrete is cured by applying moisture. On the other hand, since the compressive strength of the first specimen that is not cured after demolding is 10% or more lower than the standard strength, the effect of exerting strength on the concrete by the curing method is performed after demolding. It can be said that it is very large compared to the case without it.

  According to the present invention, by moving the curing equipment 16 along the axis of the tunnel 12, the curing performed without applying moisture and the curing performed by applying moisture to the lining concrete after demolding are sequentially performed. Can do. Thus, the lining concrete can be efficiently cured without generating cracks in the lining concrete due to a decrease in the temperature of the lining concrete due to cooling with water or steam used for curing. .

The longitudinal cross-sectional view of the tunnel by which the curing equipment which concerns on this invention is arrange | positioned. The front view of the 1st curing apparatus which concerns on this invention. The front view of the 2nd curing device in the 1st example of the present invention. FIG. 4 is an enlarged view of line 4 in FIG. 3. The front view of the 2nd curing device in the 2nd example of the present invention. The front view of the 2nd curing device in the 3rd example of the present invention. Ratio of the compressive strength of the first to third specimens to the standard strength.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile formwork 12 Tunnel 12c Arch part 12d 1st side wall part 12e 2nd side wall part 14 Covering concrete 16 Curing equipment 18 1st curing apparatus 20, 58, 66 2nd curing apparatus 22 1st cart 24 first frame 26 sheet receiving base 28 non-permeable sheet 38 second carriage 40 lifting means 42 second frame 44 mat receiving base 46 water permeable mat 50a top 50b first side 50c second side 54 First rotating means 56 Second rotating means 60 Watering nozzle 62 Piping 68 Humidifier

Claims (10)

  A curing facility for curing tunnel lining concrete formed using a mobile formwork, wherein the lining concrete is cured along a tunnel axis without applying moisture. And a second curing device for curing the lining concrete by applying moisture, the first curing device including a first carriage movable in the axial direction of the tunnel, and the first carriage A first frame fixed to the first frame, and a first curing means fixed to the first frame, the second curing device is a second carriage movable in the axial direction of the tunnel; A tunnel lining concrete curing facility having a second frame fixed to the second carriage and a second curing means fixed to the second frame.   The ratio between the length of the first curing device and the length of the second curing device is the number of days and moisture necessary for curing the lining concrete without applying moisture, and curing the lining concrete. The tunnel lining concrete curing equipment according to claim 1, which corresponds to a ratio to the number of days required to perform.   The lining concrete curing equipment for a tunnel according to claim 1, wherein the ratio of the length of the first curing device to the length of the second curing device is 1: 2.   The first curing means includes a sheet cradle having a shape corresponding to the surface shape of the lining concrete, connected to the first frame, and the lining concrete attached to the sheet cradle. The tunnel lining concrete curing equipment according to claim 1, comprising a water-impermeable sheet covering the surface.   The second curing means includes a mat base connected to the second frame and having a shape corresponding to the surface shape of the lining concrete, and the lining concrete attached to the mat base. 2. The tunnel lining concrete curing equipment according to claim 1, comprising a water-permeable mat for supplying water to the surface, and wherein the second curing device includes lifting means for lifting and lowering the second carriage. .   The tunnel elevating concrete curing equipment according to claim 5, wherein the elevating means is a plurality of jacks each having one end fixed to the second carriage and the other end directed to the ground.   The mat cradle includes a top portion having a shape corresponding to the shape of the arch portion of the tunnel, and a first side portion and a second side portion having shapes corresponding to the shapes of the left and right side wall portions of the tunnel. A first side portion pivotally attached to one end of the top portion and a second side portion pivotally attached to the other end of the top portion, wherein the second curing device includes the first side portion. 6. The tunnel lining concrete curing equipment according to claim 5, comprising: a first rotating means for rotating a side portion with respect to the top portion; and a second rotating means for rotating the second side portion with respect to the top portion. .   The first rotating means is a jack having one end connected to the first side and the other end connected to the second frame, and the second rotating means has one end connected to the second side. The lining concrete curing equipment for a tunnel according to claim 7, which is a jack connected to a side portion and connected to the second frame at the other end.   2. The tunnel lining concrete according to claim 1, wherein the second curing means includes a pipe that is attached to the second frame and has a water spray nozzle at a tip thereof that sprays water on the surface of the lining concrete. Curing equipment. 2. The tunnel lining concrete curing equipment according to claim 1, wherein the second curing means includes a humidifier attached to the second frame to supply steam to the surface of the lining concrete.

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