Wet curing device for lining concrete and method for installing the wet curing device for lining concrete

Abstract

The purpose is to more effectively suppress cracks in the lining concrete. [Solution] The moist curing device 10 for lining concrete is a moist curing device for lining concrete that cures the lining concrete that forms the inner wall of a tunnel in tunnel lining work in which the inner wall of a tunnel is covered with concrete, and is characterized in that it comprises a tunnel-shaped frame body portion 20 that is arranged at a predetermined distance from the inner wall of the tunnel and is composed of a plurality of rod-shaped members connected to each other, a moving portion that is connected to the lower part of the frame body portion 20 and allows the frame body portion 20 to move freely, a sheet-like air mat portion 22 that is laid on the upper part of the frame body portion 20 and can expand or contract, and a moist sheet portion 24 that is laid on the upper part of the air mat portion 22 so as to be located between the air mat portion 22 and the lining concrete and is composed of a hydrophilic nonwoven fabric.

Description

[Technical field]

[0001] The present invention relates to a moist curing device for lining concrete and a method for installing the moist curing device for lining concrete. [Background technology]

[0002] Conventionally, technological development has been carried out to minimize cracks in concrete structures. Tunnels are no exception, and there is a demand for the development of technology that can further suppress cracks in the lining concrete.

[0003] As an example of technology related to the present invention, Patent Document 1 discloses a curing system for tunnel lining concrete, which comprises a number of arch-shaped frame structures arranged in series in the extension direction of the tunnel, a mobile platform that supports the arch-shaped frame structures so that they can be raised and lowered, and fixed support members that fix the arch-shaped frame structures, wherein the arch-shaped frame structures comprise an upper frame structure that is placed on the top of the arch-shaped portion of the tunnel and side frame structures that are placed on both sides, and the upper frame structure and the side frame structures are arranged so that they can be bent at hinge connections and can be fixed in a connected state along the arch-shaped portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-23877 A Summary of the Invention [Problem to be solved by the invention]

[0005] Although various curing systems have been developed to date, such as those described in Patent Document 1, cracks remain an issue.

[0006] An object of the present invention is to provide a curing device for tunnel lining concrete that can more effectively suppress cracks in the lining concrete. [Means for solving the problem]

[0007] The moist curing device for lining concrete according to the present invention is a moist curing device for lining concrete that cures the lining concrete that forms the inner wall surface of a tunnel in tunnel lining work for covering the inner wall surface of a tunnel with concrete, and includes a tunnel-shaped frame body portion arranged at a predetermined distance from the inner wall surface of the tunnel and configured by connecting a plurality of rod-shaped members, a moving portion connected to the lower portion of the frame body portion and allowing the frame body portion to be moved freely, a sheet-shaped air mat portion that is laid on the upper portion of the frame body portion and can be expanded or contracted, and a movable portion between the air mat portion and the and a wet sheet portion made of a hydrophilic nonwoven fabric and laid on top of the air mat portion so as to be provided between the air mat portion and the covering concrete, wherein the air mat portion comprises a first air mat portion covering an area from the center of the curved portion on one side of the arch portion of the tunnel-shaped frame portion to the bottom portion, a second air mat portion covering an area from the center of the curved portion on the other side of the arch portion of the tunnel-shaped frame portion to the bottom portion, and a third air mat portion covering an area from the center of the curved portion on one side of the arch portion of the tunnel-shaped frame portion to the center of the curved portion on the other side. and further comprising an air supply / exhaust device for inflating or deflating the first air mat section and the second air mat section, and an air supply device having only an air supply function for inflating the third air mat section before the first air mat section and the second air mat section, The first air mat portion and the second air mat portion are connected to the tunnel-shaped frame portion using a connecting member, and the third air mat portion is placed on the tunnel-shaped frame portion without using the connecting member. Effect of the Invention

[0009] According to the present invention, cracks in the lining concrete can be more effectively suppressed. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view of a moist curing device for lining concrete according to an embodiment of the present invention. FIG. [Diagram 2]FIG. 2 is a side view of a moist curing device for lining concrete according to an embodiment of the present invention. [Diagram 3] 4 is a flowchart showing the procedure for installing a moist curing device for lining concrete according to an embodiment of the present invention. [Figure 4] 1 is a diagram showing a first member, a second member, a third member and a connecting part which constitute a frame part of a moist curing apparatus for lining concrete of an embodiment according to the present invention. FIG. [Diagram 5] FIG. 1 is a front view of a miniature-sized building of a tunnel-shaped frame portion of a lining concrete moist curing device according to an embodiment of the present invention. [Figure 6] FIG. 2 is a plan view of a miniature-sized building of a tunnel-shaped frame portion of a lining concrete moist curing device according to an embodiment of the present invention. [Figure 7] FIG. 2 is a cross-sectional view of another example of a moist curing device for lining concrete according to an embodiment of the present invention, viewed from the front side. [Figure 8] FIG. 2 is a cross-sectional view of an example for comparison with another example of a moist curing device for lining concrete according to an embodiment of the present invention, seen from the front side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following, the same elements in all the drawings are given the same reference numerals, and duplicated explanations will be omitted. In addition, in the explanation in the text, the reference numerals previously described will be used as necessary.

[0012] Fig. 1 is a perspective view of a moist curing apparatus 10 for lining concrete according to an embodiment of the present invention. Fig. 2 is a side view of the moist curing apparatus 10 for lining concrete according to an embodiment of the present invention. Fig. 3 is a flowchart showing the procedure for installing the moist curing apparatus 10 for lining concrete according to an embodiment of the present invention.

[0013] FIG. 4 is a diagram showing the first member 12, the second member 14, the third member 16 and the connecting portion 18 which constitute the frame portion 20 of the moist curing apparatus 10 for lining concrete according to the embodiment of the present invention.

[0014] Fig. 5 is a front view of a miniature-sized building of the tunnel-shaped frame 20 of the moist curing apparatus 10 for lining concrete according to the embodiment of the present invention. Fig. 6 is a plan view of a miniature-sized building of the tunnel-shaped frame 20 of the moist curing apparatus 10 for lining concrete according to the embodiment of the present invention.

[0015] The moist curing device 10 for lining concrete comprises a frame body portion 20, an air mat portion 22, a moist sheet portion 24, a water spray hose portion 26, a water supply hose portion 28, a water supply control portion 30, and rollers 32 and rails 34 which constitute the moving portion.

[0016] The lining concrete moist curing device 10 has a function of curing the lining concrete that forms the inner wall surface of a tunnel in tunnel lining work for covering the inner wall surface of a tunnel with concrete.

[0017] The moist curing device 10 for lining concrete can be suitably used as a moist curing device for lining concrete of a tunnel. In the following explanation, an example of application to a "semi-cylindrical" tunnel with a circular arc-shaped cross section will be explained. The cross section is a cross section perpendicular to the longitudinal direction (depth direction) of the tunnel.

[0018] The tunnel-shaped frame body 20 is disposed at a predetermined distance from the inner wall surface of the tunnel, and is constructed by connecting a plurality of first members 12, second members 14, third members 16, and connecting parts 18. In the following, in order to make the structure of the frame body 20 easier to understand, a miniature-sized building of the frame body 20 will be described with reference to Figures 4 to 6.

[0019] The first member 12 has a first cylindrical portion 12a having a first length, and a pair of first plate portions 12b each having a long hole 12c formed at both ends of the first cylindrical portion 12a. The first cylindrical portion 12a is a tube having a predetermined diameter, and can be set to, for example, a diameter of 2.5 cm and a length of 143 cm.

[0020] The pair of first plate portions 12b can be set to a thickness of 2 mm, a width of 3 cm, and a length of 7.5 cm. The first cylinder portion 12a and the first plate portion 12b are preferably made of a material that is lightweight and has an appropriate strength, such as steel or aluminum. The first plate portion 12a is formed with a long hole 12c that is 1.5 cm wide and 3 cm long.

[0021] As shown in the lower diagram of FIG. 4(a), the first plate portion 12b is formed in the center of the cross section of the first cylindrical portion 12a so as to follow the diameter of the first cylindrical portion 12a.

[0022] The second member 14 has a second cylindrical portion 14a having a second length longer than the first length, and a pair of second plate portions 14b each having a long hole 14c formed at both ends of the second cylindrical portion 14a. The second cylindrical portion 14a is a tube having a predetermined diameter, and can be set to, for example, a diameter of 2.5 cm and a length of 204.5 cm.

[0023] The pair of second plate portions 14b can be set to a thickness of 2 mm, a width of 3 cm, and a length of 10 cm. The second cylinder portion 14a and the second plate portion 14b are preferably made of a material that is lightweight and has an appropriate strength, such as steel or aluminum. The second plate portion 14a has a long hole 14c that is 1.5 cm wide and 5 cm long.

[0024] As shown in the lower diagram of FIG. 4(b), the second plate portion 14b is formed in the center of the cross section of the second cylindrical portion 14a so as to follow the diameter of the second cylindrical portion 14a.

[0025] The third member 16 has a third tubular portion 16a having a third length longer than the second length, and a pair of third plate portions 16b provided at both ends of the third tubular portion 16a and having a plurality of through holes 16c, 16d formed therein. The third tubular portion 16a is a tube having a predetermined diameter, and can be set to, for example, a diameter of 2.5 cm and a length of 270 cm.

[0026] The pair of third plate portions 16b can be set to a thickness of 2 mm, a width of 3 cm, and a length of 15 cm. The third cylinder portion 16a and the third plate portion 16b are preferably made of a material that is lightweight and has an appropriate strength, such as steel or aluminum.

[0027] The pair of third plate portions 16b has one side plate portion with three through holes 16c formed at predetermined intervals along the axial direction, and the other side plate portion with four through holes 16d formed at predetermined intervals along the axial direction. The three through holes 16c and the four through holes 16d have a diameter of 1.5 cm.

[0028] As shown in FIG. 4(c), the third plate portion 16b is formed on the outer periphery of the cross section of the third cylindrical portion 16a so as to extend along a tangent line of the third cylindrical portion 16a.

[0029] The connecting portion 18 has a first screwing rod portion 18a extending in a first direction, a first screwing portion 18b that can be screwed into the first screwing rod portion 18a, a second screwing rod portion 18c that extends in a direction perpendicular to the axial direction of the first screwing rod portion 18a, and a second screwing portion 18d that can be screwed into the second screwing rod portion 18c. The connecting portion 18 is preferably made of a material that is lightweight and has a suitable strength, such as steel or aluminum.

[0030] The first screwing rod portion 18a is a bolt portion in which a screwing groove having a predetermined length is formed, and the first screwing portion 18b is a nut portion that can be screwed into the screwing groove of the first screwing rod portion 18a.

[0031] The second screwing rod portion 18c is a bolt portion having a ring portion with a through hole through which the first screwing rod portion 18a can be inserted and a screwing groove extending a predetermined length from the ring portion, and the second screwing portion 18d is a nut portion that can be screwed into the screwing groove of the second screwing rod portion 18c.

[0032] Here, we will explain the manufacture of the tunnel-shaped frame body 20. Here, for easy understanding, a miniature-sized frame body 20 will be explained, but in reality, since it is used for tunnel lining, the numbers of the first members 12, second members 14, third members 16 and connecting members 18 are adjusted to construct the frame body 20 according to the size of the tunnel.

[0033] The arch portion 15, which is an arch-shaped gate, is formed by connecting a plurality of approximately isosceles triangles in an arch shape, with two first members 12 as equilateral sides and one third member 16 as a base. The arch portions 15 thus formed are arranged at predetermined intervals in the depth direction, as shown in FIG.

[0034] For simplicity, the following description will be given assuming that three arch portions 15 are arranged, however, three or more arch portions 15 can be arranged to increase the depth of the tunnel.

[0035] Then, among the vertices of adjacent arch portions 15 arranged in the depth direction, corresponding vertices are erected by the first members 12. Fig. 6 is a diagram showing the tunnel-shaped frame portion 20 as viewed from the top side of the building, and the second members 14 are erected so as to connect the vertices of adjacent arch portions 15 so as to be located at the base of a substantially right-angled isosceles triangle 17 having equilateral sides consisting of the erected first members 12 and the first members 12 of the arch portions 15, which are arch-shaped gates.

[0036] As described above, it is necessary to line up and connect the arch portions 15 in the depth direction. As shown in the enlarged view of Fig. 5 (an enlarged view of the dotted line portion from the side (arrow A direction)), the multiple arch portions 15 are connected using the first screwing rod portion 18a and the first screwing portion 18b, and as shown in Figs. 5 and 6, the first member 12 and the second member 14 to be installed are connected using the second screwing rod portion 18c and the second screwing portion 18d.

[0037] The air mat portion 22 is an inflatable or deflated sheet-like member that is laid on the upper portion of the frame portion 20. The air mat portion 22 is made of a material that has appropriate strength, flexibility, and water repellency.

[0038] The air mat section 22 is made of a multi-layered TPU-coated + 40D nylon elastic composite material that is resistant to damage. The air mat section 22 is configured to expand by injecting air into the inside with a pump (not shown) and to contract by expelling air from the inside.

[0039] The air mat portion 22 has a rectangular shape large enough to cover the entire tunnel-shaped frame portion 20 when deployed to its maximum extent.

[0040] The wet sheet section 24 is laid on the upper part of the air mat section 22 so as to be provided between the air mat section 22 and the lining concrete, and is made of a hydrophilic nonwoven fabric. The wet sheet section 24 has a rectangular shape large enough to cover the entire tunnel-shaped frame section 20 when deployed to its maximum extent.

[0041] 1, the watering hose section 26 is a hose that extends in the depth direction at the apex of the air mat section 22 covered by the tunnel-shaped frame section 20. The watering hose section 26 is disposed so as to be sandwiched between the air mat section 22 and the wet sheet section 24.

[0042] The water spray hose portion 26 has a function of spraying water flowing from a water supply source (not shown) via a water supply hose portion 28 so that the water permeates the wet sheet portion 24 .

[0043] 1, water supply hose section 28 is a hose that extends along an arch so as to connect to watering hose section 26 located at the top from the lower part of frame body section 20. One end of water supply hose section 28 is connected to watering hose section 26, and the other end is connected to water supply control section 30.

[0044] The water supply control unit 30 is a controller that controls whether or not water is supplied from a water supply source (not shown) to the water supply hose unit.

[0045] 2 is rotatable, placed on rails 34, and guided by the rails 34 to move the frame body 20. A plurality of rollers 32 are connected to the lower part of the frame body 20, and each roller 32 has four wheels. Here, the rollers 32 are configured by two sets of wheels that rotate on the same rotation axis and are parallel to each other, adjacent to each other in the longitudinal direction of the tunnel.

[0046] A roller connection part that connects to the frame body 20 is provided on the upper part of the roller 32. The roller connection part consists of two opposing pieces, each of which has a connection hole. By overlapping each piece of the roller connection part on the frame body 20 and further aligning the connection hole of the roller connection part with the connection hole of the frame body 20, and inserting a shaft part such as a bolt, it is possible to connect the frame body 20 and the roller 32.

[0047] The rails 34 are provided in the longitudinal direction (depth direction) of the tunnel, and guide the rollers 32. Here, the description will be given assuming that the rails 34 are installed on a rail stand that is C-shaped in cross section and has an open upper portion.

[0048] Rail 34 has a rail lower portion, rail side portions that are raised from both widthwise ends of the rail lower portion and cover the outer surfaces of a set of rollers, and roller upper portions that are formed by bending the upper ends of the rail side portions and cover the upper parts of rollers 32.

[0049] In this manner, the rail 34 is configured to encase the roller 32, thereby accurately guiding the roller 32 and reliably preventing the roller 32 from coming off the track.

[0050] Next, a method for installing the moist curing device 10 for lining concrete having the above-mentioned configuration will be described.

[0051] First, the air mat portion 22 is folded in an accordion-like shape to form a first overlapping rectangular portion 22a, and a first traction rope 23 is attached to the top of the first overlapping rectangular portion 22a (see Figures 2(a) and 2(b)). The first traction rope 23 is then wound around both longitudinal ends of the first overlapping rectangular portion 22a toward the center to form a first eyeglass roll as shown in Figure 2(c) (S2).

[0052] After step S2, the wet sheet portion 24 is folded in an accordion-like shape to form a second overlapping rectangular portion 24a, and a second traction rope 25 is attached to the top of the second overlapping rectangular portion 24a (see Figures 2(a) and 2(b)). The second traction rope 25 is then wound around both longitudinal ends of the second overlapping rectangular portion 24a toward the center to form a second eyeglass roll as shown in Figure 2(c) (S4).

[0053] After step S4, as shown in Figures 1 and 2(d), the first overlapping rectangular portion 22a wound in step S2 is placed at the tunnel-shaped apex of the frame body portion 20 and at the end portion in the depth direction of the frame body portion 20, and the first eyeglass roll is unfolded to the left and right, respectively, and then the first traction rope 23 is pulled to unfold it in the depth direction (S6).

[0054] After step S6, the watering hose portion 26 is placed on the spread-out air mat portion 22 along the vertex of the frame portion 20 in the depth direction, as shown in Figure 1, and the watering hose portion 26 is connected to the water supply hose portion 28 (S8).

[0055] After step S8, as shown in Figures 1 and 2(d), the second overlapping rectangular portion 24a wound in step S4 is placed at the apex of the tunnel shape of the frame body portion 20 and at the end portion in the depth direction of the frame body portion 20, and the second eyeglass roll is unfolded to the left and right, respectively, and then the second traction rope 25 is pulled to unfold it in the depth direction (S10).

[0056] After step S10, air is injected into the air mat portion 22 to expand it, and the wet sheet portion 24 is brought into contact with the lining concrete (S12).

[0057] By controlling the water supply control unit 30, water is circulated through the water supply hose section 28 to the water spray hose section 26, whereby the water is sprayed, causing the water to permeate the wet sheet section 24 and supplying moisture to the lining concrete (S14).

[0058] As described above, according to the moist curing device 10 for lining concrete, the moist sheet part 24 is made of hydrophilic nonwoven fabric and contains the moisture sprayed from the water spray hose part 26, so that the moisturizing effect of the lining concrete can be achieved. This has the remarkable effect of preventing cracks in the lining concrete.

[0059] Next, the moist curing apparatus 11 for the lining concrete will be described. Fig. 7 is a cross-sectional view of the moist curing apparatus 11 for the lining concrete as viewed from the front side.

[0060] The difference between the moist curing apparatus 11 for lining concrete and the moist curing apparatus 10 for lining concrete is the air mat parts 22a, 22b, 22c, and the following description will focus on this difference.

[0061] The difference with the air mat section 22 of the lining concrete moist curing equipment 10 is that the air mat section 20 is composed of one mat, whereas the air mat sections 22a, 22b, 22c are divided into three mats. To make this difference easier to understand, Figure 8 shows the air mat section 20 composed of one mat instead of the air mat sections 22a, 22b, 22c composed of three mats in Figure 7.

[0062] The air mat sections 22a, 22b, 22c of the moist curing equipment 11 for the lining concrete are characterized by the fact that, as shown in Figure 7, air mat section 20a covers from the ceiling side of the arch section 15 to the midpoint between the left and right sides, air mat section 22b covers from the left midpoint to the left bottom side, and air mat section 22c covers from the right midpoint to the right bottom side.

[0063] Air mat sections 22a, 22b, and 22c have exactly the same configuration as air mat section 22, with the difference being their size. Air mat section 20a is disposed symmetrically from the ceiling surface as shown in Fig. 2, and therefore will not fall even if it is not fixed to arch section 15, but air mat sections 22b and 20c are inclined as shown in Fig. 2, and therefore are fixed to arch section 15 using connecting members or the like to prevent them from falling.

[0064] 7, watering nozzles 48 and watering hoses 46 are provided at a predetermined interval on the arch portion 15. Also, arranged on the arch portion 15 are an air supply section 42 for supplying air into the air mat portion 22a to inflate it, and an air supply and exhaust section 44 for supplying air to the air mat portions 22b, 22b to inflate them and exhausting air to deflate them.

[0065] The air mat section 22a is a mat that covers the ceiling side, and is configured so that its own weight is evenly distributed over the entire surface as shown in Fig. 7. For this reason, when inflating the air mat section 22a, air needs to be fed, but when deflating the air mat section 22a, the air is exhausted by its own weight simply by putting it in a state in which the air can be discharged. Therefore, an air supply section 42 having only an air supply function is provided for the air mat section 20a.

[0066] In contrast, it is difficult for the air mat sections 22b and 22c to shrink under their own weight because their weight is biased toward the lower side located on the bottom side as shown in Fig. 7. Therefore, since the air mat sections 22b and 22c need to not only supply air but also exhaust air, an air supply and exhaust section 44 having an air supply and exhaust function is provided.

[0067] The moist curing equipment 11 for the lining concrete is divided into three air mat sections 22a, 22b, and 22c, but the basic configuration is the same as that of the moist curing equipment 10 for the lining concrete. A moist sheet section 24 is arranged on the upper part of each mat, so that when the air mat sections 22a, 22b, and 22c expand, the moist sheet section 24 comes into contact with the lining concrete, thereby supplying moisture to the lining concrete, which has the remarkable effect of preventing cracks.

[0068] The air mat section 22 is composed of one mat, and when air flows in and expands, it starts to inflate from the end on the bottom side. Depending on the installation location, the end side may come into contact with the lining concrete first, and the upper air mat 22b may not inflate easily due to friction between the lining concrete and the hydrophilic nonwoven fabric. Even under such circumstances, the lining concrete moist curing device 11 is divided into three air mat sections 22a, 22b, and 22c, so that the air mat 22b installed at the top is inflated first, followed by the air mats 22a and 22c installed at the bottom side, and therefore has the advantage that the moist sheet section 24 arranged above them can be brought into contact with the lining concrete. [Explanation of symbols]

[0069] 10 moist curing device, 12 first member, 14 second member, 16 third member, 12a first tubular portion, 12b first plate member, 12c long hole, 14a second tubular portion, 14b second plate portion, 14c long hole, 15 arch portion, 16a third tubular portion, 16b third recess portion, 16c, 16d through hole, 17 right-angled isosceles triangle, 18 connecting portion, 18a first screw-in rod portion, 18b first screw-in portion, 18c second screw-in rod portion, 18d second screw-in portion, 20 frame portion, 22 air mat portion, 24 moist sheet portion, 26 watering hose portion, 28 water supply hose portion, 29 frame portion, 30 water supply control portion, 32 roller, 34 rail.

Claims

[Claim 1] A wet curing device for lining concrete that cures lining concrete that forms a tunnel inner wall surface in a tunnel lining work for covering the tunnel inner wall surface with concrete, A tunnel-shaped frame portion arranged at a predetermined interval from the inner wall surface of the tunnel and configured by connecting a plurality of rod-shaped members; a moving part connected to a lower part of the frame part and allowing the frame part to be moved; A sheet-like air mat portion that is laid on the upper part of the frame portion and can be inflated or deflated; A wet sheet portion made of a hydrophilic nonwoven fabric and laid on the upper part of the air mat portion so as to be provided between the air mat portion and the lining concrete; Equipped with The air mat portion is A first air mat portion that covers an area from a center portion to a bottom portion of a curved portion on one side of the arch portion of the tunnel-shaped frame body portion; A second air mat portion that covers an area from the center of the curved portion on the other side of the arch portion of the tunnel-shaped frame body to the bottom surface portion; a third air mat portion covering an area from a center of a curved portion on one side of the arch portion of the tunnel-shaped frame body to a center of a curved portion on the other side; having an air supply / exhaust device for inflating or deflating the first air mat section and the second air mat section; an air supply device having only an air supply function for inflating the third air mat portion before the first air mat portion and the second air mat portion; The first air mat portion and the second air mat portion are connected to the tunnel-shaped frame portion using a connecting member, A moist curing device for lining concrete, characterized in that the third air mat portion is placed on the tunnel-shaped frame portion without using the connecting member.

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