Curing method for laminated concrete aggregate

Abstract

To simplify the work of covering a laminated concrete aggregate with a curing bag.SOLUTION: A curing bag Cb suspended below a frame body FB via suspension wires Wb, Wr, and Wg is placed over a laminated segment aggregate SG. One end of the suspension wire Wb is connected to the frame body FB, and the other end is connected to a shackle SKb. One end of each of two suspension wires Wr and Wg is detachably connected to the shackle SKb. The other end of one of the suspension wires Wr is detachably connected to a skirt portion of the curing bag Cb, and the other end of the other suspension wire Wg is connected to an outer periphery of a bottom portion BP of the curing bag Cb.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method for curing a layered concrete aggregate, and more particularly to a method for curing a pile of precast concrete such as segments that are used as tunnel lining components in shield construction. [Background technology]

[0002] After pouring concrete into the formwork, the segments are cured for several days, then removed from the formwork and cured underwater, after which they are transported to a temporary storage site and stored. Air curing is performed at the temporary storage site, but air curing can dry out the concrete surface, which can cause cracks, so in order to prevent drying, the segments are sometimes covered with curing bags to keep the concrete surface moist.

[0003] Such a method of curing concrete is described, for example, in Patent Document 1, which discloses a method of curing concrete in which plastic wrap is applied to the wet surface of the poured concrete after it has been removed from the formwork, and the concrete is then cured for a predetermined period of time. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-335587 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when covering a large segment with a ready-made protective bag, because the ready-made protective bag is small, a protective bag must be placed on each segment, which is a tedious task that takes time and effort. On the other hand, when multiple large segments are piled up and a large protective bag is placed on the assembly of the piled up large segments, the time and effort required is reduced compared to the case of covering each segment with a protective bag, but since multiple large segments are piled up, work must be done at high altitudes, and since the work must be carried out with safety in mind, it is a difficult task that takes time and effort.

[0006] The present invention has been made in light of the above-mentioned technical background, and has an object to provide a technique that can simplify the work of covering a layered concrete assembly with a curing bag. [Means for solving the problem]

[0007] In order to solve the above problems, the method for curing a layered concrete assembly according to the present invention as set forth in claim 1 includes the steps of: (a) carrying a curing bag having a depth covering the entire layered concrete assembly formed by stacking a plurality of concrete blocks in the height direction, the curing bag being shaped like a rectangular parallelepiped and having an opening and a bottom surface portion located on the opposite side of the opening; a frame having dimensions larger than the curing bag in a plan view; and a plurality of hanging members for supporting the curing bag in a suspended state below the frame, to a temporary installation site for the layered concrete assembly; and (b) carrying the frame to a crane. (c) a step of lifting the curing bag via the plurality of lifting members below the frame body with the opening of the curing bag facing downward by lifting it with a crane; (c) a step of moving the curing bag directly above the layered concrete assembly by the crane; and (d) a step of covering the layered concrete assembly with the curing bag by lowering the frame body by the crane, wherein in the steps (a) to (c), each of the plurality of lifting members is a first lifting member having one end connected to the frame body via a first mounting bracket. a wire, a connecting portion connected to the other end of the first hanging wire, a second hanging wire having one end detachably connected to the connecting portion via a second mounting bracket and the other end connected to a corner of the bottom portion of the masking bag, and a third hanging wire having one end connected to the connecting portion and the other end detachably connected via a third mounting bracket to a corner of the hem portion located on an extension line of the corner of the bottom portion to which the other end of the second hanging wire is connected, The protective bag has its bottom folded outward and rolled up so that the height of the bottom is lower than the height of the bottom of the protective bag, and in process (d), when the second mounting bracket on one end of the second hanging wire has reached its lowering position, the descent of the frame body is stopped, the second mounting bracket on one end of the second hanging wire is removed from the connection portion, and the third mounting bracket on the other end of the third hanging wire is removed from the corner of the bottom of the protective bag, thereby covering the layered concrete aggregate with the protective bag.

[0008] The curing method for a layered concrete aggregate of the present invention as described in claim 2 is characterized in that, in the invention as described in claim 1 above, in process (d), the length of the second hanging wire is set so that the length from the connecting portion to the bottom portion of the curing bag when the second mounting bracket is fully lowered is equal to or longer than the length obtained by subtracting the working height, which is located at a predetermined height from the ground, from the depth of the curing bag.

[0009] The method for curing a layered concrete aggregate of the present invention described in claim 3 is characterized in that, in the invention described in claim 2, the working height is 1 m or more and less than 2 m.

[0010] The method of curing a layered concrete aggregate of the present invention described in claim 4 is characterized in that, in the invention described in claim 2, the length of the first suspension wire is longer than the length of the second suspension wire.

[0011] The curing method for a layered concrete aggregate of the present invention described in claim 5 is characterized in that, in the invention described in claim 2 above, the length of the third suspension wire is equal to or longer than the length of the second suspension wire.

[0012] The curing method for a layered concrete aggregate of the present invention described in claim 6 is characterized in that, in the invention described in claim 1 above, an air tube is provided on the outer periphery of the bottom portion of the curing bag for maintaining the shape of the curing bag.

[0013] The method for curing a layered concrete assembly of the present invention described in claim 7 is characterized in that, in the invention described in any one of claims 1 to 6, the concrete is a segment for a tunnel lining. Effect of the Invention

[0014] According to the present invention, it is possible to simplify the work of covering a layered concrete assembly with a curing bag. [Brief description of the drawings]

[0015] [Figure 1] 1 is a side view of a stacked segment assembly and a curing tool according to one embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a side view of the laminated segment assembly and curing tool after the process of FIG. 1. [Diagram 3] FIG. 3 is an enlarged perspective view of the protective tool shown in FIG. 2. [Figure 4] FIG. 2 is a plan view of a frame constituting the protective tool of FIG. 1. [Diagram 5] FIG. 3 is an enlarged perspective view of a modified example of the curing tool in FIG. 2. [Figure 6] FIG. 3 is a side view of the stacked segment assembly and curing tool after the process of FIG. 2. [Figure 7] FIG. 7 is a side view of the stacked segment assembly and curing tool after the process of FIG. 6. [Figure 8] 8 is an enlarged side view of a main portion of the laminated segment assembly and the curing tool of FIG. 7. FIG. [Figure 9] FIG. 8 is a side view of the stacked segment assembly and curing tool after the process of FIG. 7. [Figure 10] FIG. 10 is an enlarged side view of the stacked segment assembly and curing tool of FIG. [Figure 11] FIG. 11 is an enlarged side view of the laminated segment assembly and curing tool after the process of FIG. 10 . [Figure 12] FIG. 12 is an enlarged side view of the laminated segment assembly and curing tool after the process of FIG. 11. [Figure 13] FIG. 13 is a side view of the laminated segment assembly and curing tool after the process of FIG. 12. [Figure 14] FIG. 11 is a perspective view of a protective bag constituting a protective tool according to another embodiment of the present invention. [Figure 15] 15A is a plan view of the protective bag of FIG. 14, and FIG. 15B is a front view of the protective bag of FIG. [Figure 16] FIG. 15 is an enlarged front view of the area surrounded by the dashed line in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the embodiment, the same components are generally designated by the same reference numerals, and the repeated description will be omitted.

[0017] (First embodiment)

[0018] The method for curing a layered concrete assembly of this embodiment is, for example, a method for curing a layered segment assembly formed by piling up large segments that are tunnel lining materials in shield construction. Hereinafter, an example of the method for curing a layered segment assembly of this embodiment will be described with reference to Figs. 1 to 13.

[0019] FIG. 1 is a side view of a laminated segment assembly and a curing tool according to the present embodiment.

[0020] First, the curing tool CT used to cure the stacked segment assembly SG is brought into a temporary installation site. The stacked segment assembly SG is constructed, for example, by stacking three segments S with a crane CN. The height h1 of the stacked segment assembly SG is, for example, about 6,300 mm. Furthermore, the weight of one segment S is, for example, about 10 t.

[0021] The protective tool CT comprises a protective bag Cb, a frame FB, hanging wires (hanging members) Wb, Wg, and Wr connecting them, and a wire Wn connected to the frame FB. The detailed configurations of the protective bag Cb, the frame FB, and the hanging wires Wb, Wg, and Wr will be described later. In addition, the outer surface of the protective bag Cb is hatched to clearly distinguish the inner and outer surfaces of the protective bag Cb.

[0022] Next, on the ground, a hook of a crane CN is hung on the wire Wn connected to the frame body FB, and then the frame body FB is lifted up by the crane CN. The length of the wire Wn is, for example, about 6000 mm.

[0023] Next, Figure 2 is a side view of the stacked segment assembly and curing tool after the process of Figure 1, Figure 3 is an enlarged oblique view of the curing tool of Figure 2, Figure 4 is a plan view of the frame that constitutes the curing tool of Figure 1, and Figure 5 is an enlarged oblique view of a modified example of the curing tool of Figure 2.

[0024] As shown in FIG. 2, the frame body FB is further raised by the crane CN, whereby the protective bag Cb is hoisted via the hoisting wires Wb, Wg, and Wr.

[0025] As shown in FIG. 2 and FIG. 3, the protective bag Cb is made of, for example, polyvinyl chloride or tarpaulin, and is lifted with its opening facing downward and its bottom surface BP (upper surface in FIG. 2 and FIG. 3) located on the opposite side of the opening facing upward. The outer shape of the protective bag Cb is, for example, a rectangular parallelepiped shape. The size of the protective bag Cb is large enough to cover the entire stacked segment assembly SG. The planar dimensions of the protective bag Cb are, for example, about 8300 mm×6000 mm. The weight of the protective bag Cb is, for example, about 0.3 t. At this time, the lifting height h2 (see FIG. 2) from the ground to the bottom surface BP of the protective bag Cb is, for example, about 3500 mm. This lifting height h2 corresponds to the depth-wise length of the protective bag Cb when the protective bag Cb is lifted, and is approximately half the depth-wise length of the protective bag Cb when it is stretched.

[0026] 3, in such a protective bag Cb, for example, shackles (hanging members) SKg are connected to the four corners and six points in the longitudinal center of the bottom surface BP of the protective bag Cb. Also, for example, shackles (hanging members) SKr are connected to the four corners and six points in the longitudinal center of the bottom of the protective bag Cb.

[0027] As shown in Figs. 2 and 3, the frame body FB is made of steel such as H-100 and is located above the protective bag Cb. As shown in Figs. 3 and 4, the planar shape of the frame body FB is formed, for example, in a rectangular frame shape. The size of the frame body FB in plan view is larger than the size of the protective bag Cb in plan view. This allows tension to be applied to the protective bag Cb from the center of the bottom surface portion BP of the protective bag Cb toward the outside when the protective bag Cb is being lifted by the frame body FB via the lifting wires Wb, Wg, and Wr. Therefore, the shape of the protective bag Cb can be maintained when the protective bag Cb is being lifted, so that the protective bag Cb can be successfully covered over the stacked segment assembly SG. The weight of the frame body FB is, for example, about 0.8 t.

[0028] As shown in Fig. 3, one end (upper end) of a hanging wire (hanging member, first hanging wire) Wb is detachably connected to, for example, six locations, including the four corners and the center of the longitudinal direction of the frame body FB, via a hook (hanging member, first mounting bracket) not shown. Meanwhile, a shackle (hanging member, connecting part) SKb is connected to the other end (lower end) of the hanging wire Wb. The length of the wire Wb is, for example, about 5000 mm.

[0029] Two suspending wires Wr, Wg are attached to a shackle SKb at the lower end of the suspending wire Wb. Of these, openable and closable hooks (suspending members) Fg1, Fg2 are connected to both ends of the suspending wire (suspending member, second suspending wire) Wg. The hook (suspending member, second mounting bracket) Fg1 at the upper end of the suspending wire Wg is detachably attached to the shackle SKb. Meanwhile, the hook Fg2 at the lower end of the suspending wire Wg is detachably attached to a shackle SKg connected to an outer circumferential corner of the bottom surface BP of the masking bag Cb.

[0030] The length of the hanging wire Wg is set so that when the protective bag Cb is placed over the stacked segment assembly SG, the length from the shackle SKb to the bottom of the protective bag Cb when the hook Fg1 is fully lowered is equal to or longer than the length obtained by subtracting the working height, which is located at a predetermined height above the ground, from the depth of the protective bag Cb.

[0031] The working height is a height within the reach of an ordinary worker that allows the hook Fg1 to be attached to and detached from the shackle SKb, and is, for example, 1000 mm or more and less than 2000 mm. Here, the working height is set to, for example, 1500 mm.

[0032] The length from the shackle SKb to the bottom of the protective bag Cb when the hook Fg1 is fully lowered is set to, for example, 4800 mm, which is equivalent to the length obtained by subtracting the working height (1500 mm) from the depth (6300 mm) of the protective bag Cb. The length of the hoisting wire Wg is set to, for example, about 4500 mm, which is shorter than the hoisting wires Wb and Wr.

[0033] In addition, openable and closable hooks (hanging members) Fr1 and Fr2 are connected to both ends of the hanging wire (hanging member, third hanging wire) Wr. The hook Fr1 at the upper end of the hanging wire Wr is detachably attached to the shackle SKb. Meanwhile, the hook Fr2 at the lower end of the hanging wire Wr (hanging member, third mounting bracket) is detachably attached to the shackle SKr at the corner of the bottom of the protective bag Cb located on the extension line of the corner of the bottom surface part BP of the protective bag Cb to which the hook Fg2 at the lower end of the hanging wire Wg is attached. The length of the hanging wire Wr is set to be equal to or longer than the length of the hanging wire Wg, and here, for example, is about 5000 mm, the same as the length of the hanging wire Wb.

[0034] By using such a connection configuration for the hoisting wires Wb, Wg, and Wr, when the frame body FB is raised by the crane CN, the bottom of the protective bag Cb is lifted upward by the hoisting wires Wb, Wg, and the bottom (lower end) of the protective bag Cb is bent outward by the hoisting wires Wb, Wr, and the protective bag Cb is lifted in a state where the bottom is rolled up to a position slightly lower than the height of the bottom surface part BP of the protective bag Cb. In addition, the depth direction length of the protective bag Cb at this time is approximately half the depth direction length when the protective bag Cb is stretched. By lifting with such a shape and bag length, the shape of the protective bag Cb can be maintained when lifting it or moving it laterally while lifting it, so that the protective bag Cb can be successfully covered over the stacked segment assembly SG.

[0035] Also, here, because the weight of the curing tool CT (approximately the sum of the weight of the curing bag Cb and the weight of the frame body FB) is lighter than the weight of one segment S, the curing tool CT can be hoisted using the crane CN that was used when piling up the segments S. Therefore, there is no need to prepare a dedicated crane CN for hoisting the curing tool CT, and construction costs do not increase just because the curing tool CT is hoisted.

[0036] 5, the protective bag Cb may be detachably attached to the shackles SKr at six locations on the bottom of the protective bag Cb, and the protective bag Cb may be pulled by the protective ropes Re so that tension is applied from the center of the bottom part BP of the protective bag Cb outward when the protective bag Cb is being hoisted. This makes it possible to stabilize the position of the protective bag Cb and maintain the shape of the protective bag Cb when the protective bag Cb is being hoisted.

[0037] Next, Fig. 6 is a side view of the stacked segment assembly and the protective tool after the process of Fig. 2, Fig. 7 is a side view of the stacked segment assembly and the protective tool after the process of Fig. 6, and Fig. 8 is an enlarged side view of the main parts of the stacked segment assembly and the protective tool of Fig. 7. In Fig. 8, a part of the stacked segment assembly SG covered with the protective bag Cb is shown by a dashed line for ease of understanding.

[0038] 6, the protective bag Cb is moved directly above the stacked segment assembly SG by the crane CN. At this time, the height h3 from the top surface of the stacked segment assembly SG to the bottom end of the protective bag Cb is, for example, about 500 mm.

[0039] Next, as shown in Figures 7 and 8, when the crane CN lowers the frame FB and covers the stacked segment assembly SG with the protective bag Cb, the bottom surface BP of the protective bag Cb hits the top surface of the stacked segment assembly SG and the height of the bottom surface BP of the protective bag Cb does not drop any further. At this time, as shown in Figure 7, the height h4 from the ground to the bottom surface BP of the protective bag Cb is, for example, about 6500 mm.

[0040] Next, Fig. 9 is a side view of the stacked segment assembly and the protective tool after the process of Fig. 7, and Fig. 10 is an enlarged side view of the stacked segment assembly and the protective tool of Fig. 9. In Fig. 10, the stacked segment assembly SG covered with the protective bag Cb is shown by a dashed line for ease of understanding.

[0041] As shown in Figures 9 and 10, the crane CN lowers the frame body FB, and the lowering of the frame body FB is stopped when the hook Fg1 (i.e., the shackle SKb) of the hanging wire Wg reaches its lowest point. At this time, since the length of the hanging wire Wb is longer than the length of the hanging wire Wg, the lowering of the frame body FB can be stopped without the frame body FB hitting the upper surface of the stacked segment assembly SG. Here, the length of the hanging wire Wb is, for example, about 5000 mm, and the length of the hanging wire Wg is, for example, about 4500 mm, so that a distance of about 500 mm can be secured between the frame body FB and the upper surface of the stacked segment assembly SG. Therefore, deterioration or damage to the segments S caused by the frame body FB coming into contact with the segments S can be prevented.

[0042] 10, when the shackles SKb and hooks Fg1 at the ends of the hoisting wires Wb and Wg are lowered to their lowest position, the height (working height) h5 from the ground to the shackles SKb is, for example, about 1500 mm. That is, the height h5 of the shackles SKb at the lower ends of the hoisting wires Wb and Wg can be set to a height that can be reached by the hands of an operator.

[0043] Furthermore, at this time, as shown in Figures 9 and 10, the bottom part of the protective bag Cb that has been rolled up (see Figures 7 and 8, etc.) is lowered until it reaches the ground. At this time, in this embodiment, since the length of the hanging wire Wr is equal to or longer than the length of the hanging wire Wg, even if the bottom part of the protective bag Cb gets caught above the protective bag Cb, the hanging wire Wr has come down in a slack state to a position within the reach of the worker, and the worker can lower the bottom part of the protective bag Cb to the ground by pulling the hanging wire Wr. In this way, the shackle SKr at the bottom part of the protective bag Cb is lowered to the ground, and the entire stacked segment assembly SG can be covered by the protective bag Cb.

[0044] Next, Fig. 11 is an enlarged side view of the stacked segment assembly and the protective tool after the process of Fig. 10, and Fig. 12 is an enlarged side view of the stacked segment assembly and the protective tool after the process of Fig. 11. In Fig. 10 and Fig. 11, the stacked segment assembly SG covered with the protective bag Cb is shown by a dashed line for ease of understanding.

[0045] As shown in Fig. 11, the hook Fr2 at the lower end of the hanging wire Wr attached to the shackle SKr at the bottom of the protective bag Cb is opened and removed from the shackle SKr. Next, as shown in Fig. 12, the hook Fg1 of the hanging wire Wg that has been lowered to a position within the worker's reach is opened and removed from the shackle SKb at the lower end of the hanging wire Wb. In this way, the protective bag Cb is removed from the frame FB. However, the process in Fig. 11 and the process in Fig. 12 may be reversed.

[0046] Next, FIG. 13 is a side view of the laminated segment assembly and the curing tool after the process of FIG.

[0047] As shown in Fig. 13, the frame body FB is raised by the crane CN. A hoisting wire Wb is connected to the frame body FB. A hoisting wire Wr is connected to a shackle SKb at the lower end of the hoisting wire Wb via a hook Fr1 (see Fig. 12, etc.). Meanwhile, a hoisting wire Wg is connected to a shackle SKg (see Fig. 12, etc.) near the bottom surface BP (upper surface in Fig. 13) of the protective bag Cb via a hook Fg2 (see Fig. 12, etc.).

[0048] Here, when covering the stacked segment assembly with a large protective bag, work must be done at a high altitude, and since safety must be taken into consideration when proceeding with the work, this is a time-consuming and difficult task. In contrast, in this embodiment, since work is not done at a high altitude when covering the layered concrete assembly SG with the protective bag Cb, the work can be simplified. In addition, since work is not done at a high altitude when covering the layered concrete assembly SG with the protective bag Cb, the safety of the work can be improved.

[0049] On the other hand, to remove the masking bag Cb, the above-described steps are reversed. That is, for example, the steps are as follows.

[0050] First, as shown in Fig. 13, a frame body FB is moved by a crane CN to directly above a stacked segment assembly SG (see Fig. 12, etc.) covered with a masking bag Cb. Suspension wires Wb, Wr are connected to the frame body FB in a suspended state.

[0051] Next, as shown in Figures 9 and 10, the frame FB is lowered and stopped at a position slightly above the top surface of the stacked segment assembly SG (the bottom surface BP of the protective bag Cb). After that, as shown in Figure 10, the hook Fr2 at the bottom end of the hanging wire Wr is hooked onto the shackle SKr at the bottom of the protective bag Cb and connected. Also, the hook Fg1 of the hanging wire Wg is hooked onto the shackle SKb at the bottom end of the hanging wire Wb and connected.

[0052] Next, as shown in Fig. 6, the crane CN raises the frame FB to hoist the protective bag Cb. Then, the bottom of the protective bag Cb is hoisted upward by the hoisting wires Wb, Wg, and the bottom (lower end) of the protective bag Cb is bent outward by the hoisting wires Wb, Wr, and the protective bag Cb is hoisted in a state where the bottom is rolled up to a position slightly below the height of the bottom surface BP of the protective bag Cb.

[0053] Next, the frame body FB is raised by the crane CN to raise the protective bag Cb above the top surface of the stacked segment assembly SG, and then the protective bag Cb is lowered to the ground by the crane CN as shown in FIG.

[0054] In this embodiment, since the work is not performed at a high altitude when removing the protective bag Cb from the layered concrete aggregate SG, the work can be simplified. Also, since the work is not performed at a high altitude when removing the protective bag Cb from the layered concrete aggregate SG, the safety of the work can be improved.

[0055] (Second embodiment)

[0056] Fig. 14 is a perspective view of a protective bag constituting the protective tool of this embodiment, Fig. 15(a) is a plan view of the protective bag of Fig. 14, Fig. 15(b) is a front view of the protective bag of Fig. 14, and Fig. 16 is an enlarged front view of the area surrounded by the dashed line in Fig. 14. Figs. 14 to 16 show the state when the protective bag Cb covers the stacked segment assembly SG (see Fig. 1, etc.).

[0057] In this embodiment, as shown in Figures 14 to 16, an air tube At is provided on the outer periphery of the bottom surface portion BP (top surface in Figures 14, 15(b) and 16) of the protective bag Cb. As shown in Figures 14 and 15(a), the air tube At is provided in a frame shape along the outer periphery of the protective bag Cb. By injecting air into this air tube At to inflate it, the shape of the protective bag Cb can be maintained, and the protective bag Cb can be successfully placed over the stacked segment assembly SG.

[0058] As shown in Fig. 14, an air injection pipe Ti is connected to the air tube At so that air can be injected from the ground. An air exhaust pipe Te is connected to the lower side of the masking bag Cb to exhaust the air inside the masking bag Cb. The height h6 of the inlet of the air injection pipe Ti and the outlet of the air exhaust pipe Te is a height that can be reached by an operator, for example, about 1000 mm.

[0059] As shown in Fig. 14 and Fig. 16, the air tube At is detachably attached to the outer periphery of the bottom surface BP (upper surface in Fig. 14 and Fig. 16) of the protective bag Cb. That is, as shown in Fig. 16, a connection part Za is provided on the outer periphery on the bottom surface of the protective bag Cb, and a plurality of through holes Ha are drilled in the connection part Za at predetermined intervals along the outer periphery of the protective bag Cb. Meanwhile, a connection part Zb is provided on the lower part of the air tube At, and a plurality of through holes Hb are drilled in the connection part Zb at predetermined intervals along the extension direction of the air tube At. Then, a string Rc is passed through these through holes Ha, Hb and tied tightly, so that the protective bag Cb and the air tube At are detachably connected.

[0060] Also, as shown in Fig. 14, at the bottom of the protective bag Cb, for example, hooks FKg made of nylon are sewn in place of the above-mentioned shackles SKg (see Fig. 3, etc.) at six points, for example, at the four corners and at the center in the longitudinal direction. Also, as shown in Fig. 14 and Fig. 16, at the upper part of the side near the bottom part BP of the protective bag Cb, for example, hooks FKr made of polyester are sewn in place of the above-mentioned shackles SKr (see Fig. 3, etc.) at six points, for example, at the four corners and at the center in the longitudinal direction.

[0061] As shown in Fig. 15(a), the planar dimensions (length L x width D) of the protective bag Cb are, for example, about 8300 mm x 6000 mm. As shown in Fig. 15(b), the height h7 of the protective bag Cb is, for example, about 6500 mm. Other configurations and effects are the same as those of the first embodiment, so description will be omitted.

[0062] The invention made by the inventor has been specifically described above based on the embodiment, but the embodiment disclosed in this specification is illustrative in all respects and is not limited to the disclosed technology. In other words, the technical scope of the present invention should not be interpreted restrictively based on the description in the above embodiment, but should be interpreted strictly according to the description in the claims, and includes technologies equivalent to the described technologies in the claims and all modifications that do not deviate from the gist of the claims.

[0063] For example, in the above embodiment, a case has been described in which lifting wires Wb, Wg, and Wr are used to lift the protective bag Cb, but this is not limited to this, and for example, a belt sling made of nylon or polyester or a chain made of steel may also be used. [Industrial Applicability]

[0064] In the above explanation, the method for curing a layered concrete assembly of the present invention is shown as being applied to a method for curing a layered segment assembly, but it can also be applied to a method for curing concrete other than segments. [Explanation of symbols]

[0065] SG Layered Segment Assembly (Layered Concrete Assembly) S segment (concrete) CT curing tools Cb curing bag BP bottom part FB frame Wn Wire Wb Suspension wire (suspension member, first suspension wire) Wg Suspension wire (suspension member, second suspension wire) Wr Suspension wire (suspension member, third suspension wire) SKb Shackle (hanging member, connecting part) SKr, SKg shackles (hanging parts) Fg1 Hook (hanging member, second mounting bracket) Fg2 Hook (hanging member) Fr1 Hook (hanging member) Fr2 Hook (hanging member, third mounting bracket) Re: Kaishaku Rope At Air Tube Ti Air Injection Tube Te Air Exhaust Pipe Za,Zb connection part Ha,Hb through hole Rc String FKg, FKr hook

Claims

1. (a) a process of transporting a curing tool to a temporary installation site for the layered concrete assembly, the curing tool comprising a curing bag having a depth covering the entire layered concrete assembly formed by stacking multiple concrete blocks in the height direction, a rectangular prism-shaped curing bag having an opening and a bottom surface located on the opposite side of the opening, a frame having dimensions larger than the curing bag in a plan view, and multiple hanging members for supporting the curing bag in a suspended state below the frame; (b) a step of lifting the protective bag below the frame body via the plurality of hanging members with the opening of the protective bag facing downward by lifting the frame body with a crane; (c) moving the curing bag directly above the layered concrete mass by the crane; and (d) lowering the frame by the crane to cover the layered concrete assembly with the curing bag; having In the steps (a) to (c), each of the multiple hanging members includes a first hanging wire having one end connected to the frame body via a first mounting bracket, a connecting portion connected to the other end of the first hanging wire, a second hanging wire having one end connected to the connecting portion via a second mounting bracket in a detachable manner and the other end connected to a corner of the bottom portion of the masking bag, and a third hanging wire having one end connected to the connecting portion and the other end connected to a corner of the hem portion located on an extension line of the corner of the bottom portion to which the other end of the second hanging wire is connected, in a detachable manner via a third mounting bracket; In the steps (b) and (c), the bottom of the protective bag is folded outward and rolled up so that the height of the bottom is lower than the height of the bottom surface of the protective bag, In the (d) step, when the second mounting bracket at one end of the second suspension wire has reached its lowering position, the descent of the frame body is stopped, the second mounting bracket at one end of the second suspension wire is removed from the connection portion, and the third mounting bracket at the other end of the third suspension wire is removed from the corner of the bottom of the protective bag, thereby covering the layered concrete aggregate with the protective bag.

2. A method for curing a layered concrete aggregate as described in claim 1, characterized in that in process (d), the length of the second hanging wire is set so that the length from the connecting portion to the bottom portion of the curing bag when the second mounting bracket is fully lowered is equal to or longer than the length obtained by subtracting the working height, which is located at a predetermined height above the ground, from the depth of the curing bag.

3. 3. The method for curing a layered concrete mass according to claim 2, wherein the working height is 1 m or more and less than 2 m.

4. 3. The method for curing a layered concrete assembly according to claim 2, wherein the length of said first suspension wire is longer than the length of said second suspension wire.

5. 3. The method for curing a layered concrete assembly according to claim 2, wherein the length of said third suspension wire is equal to or longer than the length of said second suspension wire.

6. 2. The method for curing a layered concrete mass according to claim 1, further comprising the step of providing an air tube around the outer periphery of the bottom portion of the curing bag for maintaining the shape of the curing bag.

7. The method for curing a layered concrete assembly according to any one of claims 1 to 6, characterized in that the concrete is a segment for a tunnel lining.

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