Waterstop construction method

Abstract

The objective is to ensure that the entire area inside the cable tray or the like, especially the gaps between cables, is thoroughly filled with sealant in a waterproofing method for cable trays or the like that are inserted through holes in walls. [Solution] In a waterproofing method for sealing the inside of a through-hole (3) of a cable tray (6), before the step of pouring the sealant (21) into the portion (6A) inside the through-hole (3) of the cable tray (6), the portion (6A) inside the through-hole (3) of the cable tray (6) is maintained in an inclined position such that one side in the longitudinal direction (D) of the cable tray (6) is higher than the other side, and in the pouring step, the sealant (21) is poured into the inclined portion (6A) inside the through-hole (3) from one side.

Description

Technical Field

[0001] The present invention relates to a waterstop construction method for sealing the inside of a cable tray or a conduit containing a plurality of cables, which is inserted or embedded in a through-hole formed in a wall of a building for waterstop or the like.

Background Art

[0002] In cable wiring work in various plant facilities, cables are laid in various places in a building, so there are places that penetrate building structures such as walls and floors. For cable wiring, electric circuits using cable trays or conduits are usually used. In the case of a cable tray, a through-hole slightly larger than the cable tray is opened in a wall or the like, the cable tray is passed through the through-hole, and cables are laid in the cable tray. In the case of a conduit, a cylindrical conduit is embedded in a wall or the like, and electric wire cables are laid therein.

[0003] In these cable wiring works, in the case of a cable tray, it is necessary to block the entire inside of the cable tray and the entire through-hole formed in the wall, and in the case of a conduit, it is necessary to block the mouth of the conduit after laying the cables. The main treatment methods include fireproof treatment, airtight treatment, and waterstop treatment. There are approved construction methods by the Minister of Land, Infrastructure, Transport and Tourism for fireproof treatment, and each manufacturer obtains the approved construction methods and those methods are adopted. On the other hand, for airtight treatment and waterstop treatment, there are pressure resistance requirements according to the positions of through-holes in each building, and construction methods and materials that satisfy these requirements are needed.

[0004] In airtight treatment and waterstop treatment for through-holes in structures such as walls, in the case of a cable tray, the entire inside of the cable tray is blocked, and in the case of a conduit, the entire inside of the conduit is blocked. In particular, it is necessary to reliably block the gaps between the cables. Therefore, during construction, a sealing material in a liquid state that penetrates into narrow gaps and hardens over time after construction is widely used.

[0005] Patent Document 1 discloses a waterproofing method in which a liquid sealant is poured into the inside of a cable tray to perform waterproofing treatment. Figures 18 and 19 are diagrams showing the waterproofing method disclosed in Patent Document 1. Figure 18 is a perspective view of the cable 54 and cable tray 55, in which dozens of cables 54 are stored inside a ladder-shaped cable tray 55 inserted through a through-hole 53 in the wall 52 of the building. A backing plate 57 is fixed to the lower surface of a plurality of struts 56 that form the bottom of the ladder-shaped cable tray 55 with clamps 59. Inside the cable tray 55 above the backing plate 57, a weir (sealing member) 60 is formed near the wall. Furthermore, a weir (sealing member) 61 is formed in a portion separated from there. Figure 19 is a vertical cross-sectional view of the cable tray 55 and cable 54, in which the cable tray 55, cable 54 and backing plate 57 are maintained in a horizontal position. Liquid sealant 63 is poured from above into the space enclosed by the two weirs 60 and 61 and the backing plate 57 by the sealant supply device 62. It is then allowed to harden over time, forming a watertight structure. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2019-213262 [Overview of the project] [Problems that the invention aims to solve]

[0007] The waterproofing method for a cable tray 55 described in Patent Document 1 involves pouring a liquid sealant 63 into the cable tray 55 from above while the cable tray 55 is installed horizontally. Gravity causes the sealant 63 to fall downwards, allowing it to penetrate into the gaps inside the cable tray 55.

[0008] When pouring the sealant 63 in a horizontal position like this, as shown in Figure 18, if a large number of cables 54 of the same outer diameter and shape are neatly stored, it can be expected that the sealant will penetrate thoroughly by arranging the cables 54 with space between them. However, in current plant facilities, a large number of cables of various outer diameters or shapes are often stored in a complicated, intertwined manner. In addition, there are many cases where the cables are tightly packed together without any gaps. In such cases, even a fluid sealant will have difficulty penetrating thoroughly to the bottom of the cable tray. Furthermore, while downward penetration within the cable tray can be expected, it is difficult to penetrate the entire length of the cable tray. As a result, the sealant hardens with gaps remaining, leaving a problem in that sufficient watertight performance cannot be ensured.

[0009] The object of the present invention is to provide a waterproofing method for cable trays or conduits inserted through through holes formed in the walls of a building, by ensuring that the liquid sealant flows quickly in the length direction of the cable tray or conduit, thereby thoroughly filling the gaps between cables. This makes it possible to improve waterproofing performance. [Means for solving the problem]

[0010] To solve the aforementioned problems, the present invention provides a method for waterproofing a cable tray, in which a cable tray containing a plurality of cables is inserted through a through hole formed in the wall of a building, and a sealant is poured into the inside of the cable tray and the poured sealant is hardened to seal the inside of the cable tray. In this method, prior to the pouring step, the portion of the cable tray inside the through hole is maintained in an inclined position in which one side of the cable tray in the longitudinal direction is higher than the other side, and in the pouring step, the sealant is poured into the inclined portion inside the through hole from the one side.

[0011] According to the above configuration, the liquid sealant poured into the cable tray from one side moves downward and simultaneously moves along the length of the cable tray to the other, lower side. This allows the liquid sealant to quickly and thoroughly fill the entire interior of the cable tray.

[0012] In one aspect of the present invention, cables of various outer diameters or shapes are mixed together in the cable tray. Even in such a situation, the sealing material can be filled evenly throughout the entire interior of the cable tray.

[0013] In one aspect of the present invention, a weir is formed in the inclined portion of the cable tray within the through hole, at the other end in the longitudinal direction, to prevent leakage of the sealing material.

[0014] According to the above configuration, it is possible to prevent liquid sealant (material) from flowing out into unnecessary areas within the cable tray, thereby reducing material waste and eliminating unnecessary work such as removing spilled material. In addition, the weir allows the sealant to be quickly filled to a certain liquid level.

[0015] In one aspect of the present invention, a lid is attached to the upper opening of the inclined portion within the through-hole of the cable tray.

[0016] According to the above configuration, it is possible to prevent the sealing material from unnecessarily overflowing from the cable tray.

[0017] In one aspect of the present invention, the portion of the cable tray within the through-hole is detachable from the rest of the cable tray at both ends in the longitudinal direction. The portion of the cable tray within the through-hole is supported at both ends in the longitudinal direction by support means and is maintained at an inclination by operation of the support means.

[0018] With this configuration, after the sealing material is filled and hardened, the portion within the through-hole can be returned to a horizontal position and connected to the remaining portion. As a result, even cable trays that are already installed in a horizontal position can be easily waterproofed according to the present invention and easily returned to their original horizontal position.

[0019] In one aspect of the present invention, the support means is a suspension device that suspends both ends in the longitudinal direction of the portion within the through-hole of the cable tray.

[0020] In one aspect of the present invention, the portion of the cable tray within the through-hole is detachable at one end in the longitudinal direction from the rest of the cable tray, and the portion of the cable tray within the through-hole is supported at one end in the longitudinal direction by a support means and tilted by operation of the support means.

[0021] In one aspect of the present invention, a method for waterproofing an electrical conduit is provided in which an electrical conduit containing a plurality of cables is embedded in a through-hole formed in the wall of a building, and a sealant is poured into the inside of the electrical conduit and the poured sealant is hardened to seal the inside of the electrical conduit. In this method, the electrical conduit is maintained in an inclined position in which one side in the longitudinal direction of the electrical conduit is higher than the other side, and in the pouring step, the sealant is poured from the one side of the electrical conduit.

[0022] According to the above configuration, the liquid sealant poured into the conduit from one side moves downward and simultaneously flows to the other, lower side of the conduit, quickly and thoroughly filling the conduit.

[0023] In one aspect of the present invention, cables of various outer diameters or shapes are mixed together inside the conduit. Even in such a situation, the sealing material can be thoroughly filled into the entire interior of the conduit.

[0024] As one aspect of the invention of the present application, a weir for preventing leakage of the sealing material is formed at the end on the other side in the longitudinal direction of the wire conduit.

[0025] According to the above configuration, it is possible to prevent the liquid sealing material (material) from flowing out to the unnecessary range of the wire conduit and prevent waste of the material. In addition, the weir can quickly raise the liquid level of the sealing material to a certain height.

[0026] As one aspect of the invention of the present application, a wire conduit housing a plurality of cables is disposed in a through hole formed in a wall of a building or in a sleeve embedded in the through hole, and a sealing material is poured into the wire conduit, and the poured sealing material is cured. In a method for stopping water in a wire conduit for sealing the inside of the wire conduit, the wire conduit is maintained in an inclined posture in which one side in the longitudinal direction of the wire conduit is higher than the other side, and in the step of pouring the sealing material, the pouring is performed from the one side of the wire conduit.

Effects of the Invention

[0027] According to the present invention, the liquid sealing material poured from one side into the cable tray or the wire conduit moves downward and at the same time flows to the lower other side of the cable tray or the wire conduit, and quickly and without gaps fills the cable tray and the wire conduit. Thereby, a sealing structure with high water stopping performance can be provided.

Brief Description of the Drawings

[0028] [Figure 1] A cable tray and a cable in which a water stopping construction method according to a first embodiment of the present invention is carried out, which is a horizontal sectional view (sectional view taken along line I-I of FIG. 2) of a through hole arrangement portion. [Figure 2] It is an enlarged sectional view taken along line II-II of FIG. 1. [Figure 3] It is an enlarged sectional view taken along line III-III of FIG. 1 showing the cable tray in a horizontal state before inclination. [Figure 4] It is an enlarged sectional view taken along line III-III of FIG. 1 showing the cable tray in an inclined state after inclination. [Figure 5] This is an enlarged longitudinal cross-sectional view of the cable tray showing the initial stage of the sealing material pouring process in the first embodiment, where (a) shows the state at the start of sealing material pouring and (b) shows the state when the sealing material has spread over the entire lower end of the cable tray. [Figure 6] The first embodiment shows an enlarged cross-sectional view of the cable tray during an intermediate stage of the sealing material pouring process, where (a) shows the state when the sealing material has been filled to about half the height of the weir, and (b) shows the state when the sealing material has been filled to about three-quarters the height of the weir. [Figure 7] This is an enlarged longitudinal cross-sectional view of a cable tray showing the final stage of the sealing material pouring process in the first embodiment, where (a) shows the state when the sealing material has been filled up to the upper end of the weir, and (b) shows the state when the sealing material has been filled throughout the specified space within the cable tray. [Figure 8] This is a horizontal cross-sectional view (cross-sectional view along line VIII-VIII in Figure 9) of the portion of the electrical conduit and cable penetration hole insertion area where the water-stopping construction method of the second embodiment of the present invention is implemented. [Figure 9] Figure 8 is an enlarged view of the cross-section along line IX-IX. [Figure 10] Figure 8 is an enlarged cross-sectional view of line XX. [Figure 11] This is an enlarged cross-sectional view of line XX in Figure 8, showing the area with the weir in place. [Figure 12] The second embodiment shows an enlarged vertical cross-sectional view of the through-hole portion, indicating an intermediate stage in the sealing material pouring process. (a) shows the state when the sealing material has filled to about half the height of the weir, and (b) shows the state when the sealing material has filled to about 4 / 5 the height of the weir. [Figure 13] The second embodiment shows an enlarged vertical cross-sectional view of the through-hole portion at the end of the sealing material pouring process, where (a) shows the state when the sealing material has been filled up to the upper end of the weir, and (b) shows the state when the sealing material has been filled throughout the specified space inside the conduit. [Figure 14] This is a longitudinal cross-sectional view of the cable tray and the portion where the cable through-holes are arranged, before inclination, in which the waterproofing construction method of the third embodiment of the present invention is implemented. [Figure 15] This is a vertical cross-sectional view of the same part as Figure 14, showing the state when the suspension device is attached. [Figure 16] This is a vertical cross-sectional view of the same part as Figure 14, showing the state when both ends of the cable tray's through-hole portion have been removed from the rest of the tray. [Figure 17] This is a vertical cross-sectional view of the same section as Figure 14, showing the cable tray tilted by temporarily suspending it with a suspension device. [Figure 18] This is a perspective view of a cable tray and cable in which a conventional waterproofing method is applied. [Figure 19] Figure 18 is a longitudinal cross-sectional view of the cable tray and the inside of the cable through-hole. [Modes for carrying out the invention]

[0029] [First Embodiment] Based on Figures 1 to 7, the equipment and the waterproofing method according to the first embodiment will be described.

[0030] Figure 1 is a horizontal cross-sectional view (corresponding to the section along line I-I in Figure 2) of the cable tray 6 and the portion through which the cables 5 are inserted into the through-holes where the waterproofing construction method according to the first embodiment is implemented. In Figure 1, the numerous cables 5 and the cable tray 6 that houses these cables 5 are arranged near the side of the first wall 1 inside the building and are positioned to extend almost horizontally along the first wall 1. A second wall 2 is connected perpendicularly to the first wall 1 midway along the wall, and through-holes 3 are formed in the second wall 2, penetrating parallel to the first wall 1. The numerous cables 5 and the cable tray 6 are inserted through the through-holes 3. In this embodiment, the case in which the first wall 1 and the second wall 2 are connected in an orthogonal manner has been described, but the present invention is not limited to this. The present invention can also be applied when only the second wall 2 exists and the first wall 1 does not exist. Furthermore, since the cable tray may bend after passing through the through hole, extending horizontally along the first wall 1 is also an example of a cable tray route.

[0031] Figure 2 is an enlarged cross-sectional view taken along line II-II in Figure 1. In Figure 2, the cross-sectional shape of the through-hole 3 is formed as a rectangle that is elongated in the vertical direction, and a pair of upper and lower cable trays 6 are arranged inside the through-hole 3 with spacing between them in both the vertical and horizontal directions relative to the inner surface of the through-hole 3. That is, the through-hole 3 is formed to be slightly larger than the pair of cable trays 6. The present invention has been described in the case where the cable trays are a pair, but the present invention is not limited to this, and the present invention can also be applied when the cable trays are not a pair. For example, it can be applied when there is one cable tray or three or more cable trays.

[0032] Each of the upper and lower cable trays 6 is formed in a U-shape with an open top. Specifically, it is composed of a plate-shaped bottom 6a, a pair of side plates 6b formed at both ends of the bottom 6a in the width direction, and a bent portion 6c formed at the upper end of the side plates 6b, forming an open U-shape in cross-section. Cables 5 of various outer diameters are stored together in each cable tray 6. Note that the bottom plate, side plates, bent portion, etc. of the cable tray 6 in this embodiment are just examples of the shape and structure of the cable tray, and the present invention can be applied to other structures as well. That is, the cross-sectional shape of the cable tray 6 shown in Figure 2 is just an example, and it is also possible to use a shape without, for example, the bent portion 6c at the upper end.

[0033] Figure 3 is an enlarged cross-sectional view of line III-III in Figure 1, showing the cable tray 6 in a horizontal state before tilting. In Figure 3, the upper and lower cable trays 6 are arranged parallel to each other.

[0034] Figure 4 is an enlarged cross-sectional view of line III-III in Figure 1, showing the cable tray 6 in an inclined state. In Figure 4, the cable tray 6 is maintained inclined at a constant angle θ with respect to the horizontal plane L such that one side in the longitudinal direction D of the cable tray 6 is higher than the other side. The angle θ is determined so that the liquid sealant flows from one side to the other through the gaps between the cables 5 inside the cable tray 6. Specifically, it is determined by the fluidity of the liquid sealant 63, the curing time, the number of cables 5, and the mixture of large and small diameter cables. For example, the angle θ is set in the range of approximately 1 to 15 degrees with respect to the horizontal plane L (this is based on the provided drawing).

[0035] Before the sealing material is poured into the cable tray 6, a weir 10 to prevent leakage of the sealing material and a lid 11 to prevent overflow are fixed to it. The weir 10 is formed at the other end in the longitudinal direction of the portion inside the through hole 3 of the cable tray 6. The weir 10 is also formed to rise almost perpendicularly to the bottom 6a of the cable tray 6. This weir 10 is formed, for example, by pouring liquid sealing material for the weir into the aforementioned position and allowing it to harden. The lid 11 is fixed to the upper surface of the upper bent portion 6c of the cable tray 6. As mentioned above, in the case of a cable tray 6 that does not have a bent portion 6c, the lid 11 is fixed across the upper ends of the side plate portions 6b shown in Figure 2.

[0036] Figures 5(a) and 5(b), 6(a) and 6(b), and 7(a) and 7(b) are longitudinal cross-sectional views showing the process of pouring the sealant 21 into the cable tray 6 in chronological order. Here, longitudinal cross-sectional views of the same parts as in Figure 5 are shown in chronological order from the initial pouring stage to the intermediate and final stages. Figure 5(a), showing the initial state, shows the state at the start of sealant pouring, and Figure 5(b) shows the state when the sealant 21 has spread to the entire bottom 6a of the cable tray 5. Figure 6(a), showing the intermediate stage, shows the state when the sealant 21 has filled to about half the height of the weir 10, and Figure 6(b) shows the state when the sealant 21 has filled to about three-quarters the height of the weir 21. Figure 7(a), showing the final stage, illustrates the state when the sealant has filled up to the upper end of the weir 10, while Figure 7(b) illustrates the state when the sealant 21 has spread across the entire lower surface of the lid 11 and filled the entire specified space within the cable tray 6.

[0037] During the initial, intermediate, and final stages of the pouring process, the sealant 21 falls downwards within the cable tray 6 due to gravity, and simultaneously moves from one higher side to the other due to the inclination of the bottom 6a and the inclination of the cables 5 themselves. This ensures that the entire cable tray 6, especially the gaps between the cables 5, is sufficiently filled with the sealant 21. Furthermore, by using the weir 10 to block the sealant 21, and by using the lid 11 to prevent overflow, it is possible to fill the cable tray 6 with the sealant 21 within the specified space without waste.

[0038] As shown in Figure 7(b), after pouring the sealant 21 into the designated space within the cable tray 6, it is allowed to harden for a predetermined time to complete the sealing structure within the cable tray 6.

[0039] After hardening is complete, a waterproof structure is formed by filling the openings at both ends of the through-hole 6 in the longitudinal direction with waterproof putty 25, as shown by the dashed lines in Figure 7(b). The method of waterproofing the openings at both ends in the longitudinal direction is not limited to waterproof putty. For example, the present invention can also be applied when most of the through-hole 3 is closed by attaching steel materials and iron plates, and the remaining small gaps are closed with a sealing material.

[0040] [Second Embodiment] Based on Figures 8 to 13, the equipment and method for implementing the waterproofing construction method according to the second embodiment of the present invention will be described. While the first embodiment described above is applied to a structure in which the cable is housed in a cable tray, the second embodiment is applied to a structure in which the cable 5 is housed in a cylindrical conduit 30. The same reference numerals are used for the same parts as in the first embodiment.

[0041] Figure 8 is a horizontal cross-sectional view (section VIII-VIII in Figure 9) of the portion where the conduit 30 and cable 5 are inserted through the through-hole. In Figure 8, a cylindrical conduit 30 is embedded in the through-hole 3 of the second wall 2. The space between the inner surface of the through-hole 3 and the outer surface of the conduit 30 is watertight with no gaps. Numerous cables 5 are inserted through this conduit 30.

[0042] Figure 9 is an enlarged cross-sectional view of the line IX-IX in Figure 8. In Figure 9, numerous cables 5 of various outer diameters are housed together inside the conduit 30.

[0043] Figure 10 is an enlarged cross-sectional view of the conduit 30 section along line XX in Figure 8. In Figure 10, the conduit 30 is embedded in the through-hole 3 of the second wall 2, inclined at an angle θ with respect to the horizontal plane L such that one side is higher. The length of the conduit 30 is set to be approximately the same as the length of the through-hole 3.

[0044] Figure 11 shows that a weir 31 for preventing leakage of the sealant is provided at the other end of the conduit 30 in the longitudinal direction.

[0045] Figures 12(a),(b) and 13(a),(b) are enlarged longitudinal cross-sectional views showing the process of pouring the sealing material 21 into the conduit 30 in chronological order from the intermediate stage to the final stage of pouring.

[0046] Figure 12(a), showing the intermediate stage, shows the state when the sealant 21 is filled to about half the height of the weir 31, and Figure 12(b) shows the state when the sealant 21 is filled to about 4 / 5 the height of the weir 31. Figure 13(a), showing the final stage, shows the state when the sealant is filled to the top of the weir 31, and Figure 13(b) shows the state when the sealant 21 is filled over the entire top surface of the conduit pipe 31.

[0047] In the pouring process, the sealant 21 is poured into the conduit 30 from an opening on one side in the longitudinal direction of the conduit 30. The poured sealant 21 falls downward due to gravity, and at the same time flows from the higher side to the lower side due to the inclination of the conduit 30 and the inclination of the cable 5 itself. This allows the sealant 21 to be sufficiently filled throughout the conduit 30, especially in the gaps between the cables 5. Furthermore, by blocking the flow of the sealant 21 with the weir 31, the conduit 30 can be filled completely without waste.

[0048] [Third Embodiment] Based on Figures 14 to 17, the equipment and method for implementing the waterproofing construction method according to the third embodiment of the present invention will be described. The third embodiment is a modified version of the first embodiment described above. The same reference numerals are used for the same parts as in the first embodiment.

[0049] Figure 14 is a longitudinal cross-sectional view of the cable tray 6 and the portion of the cable 5 with through-holes 3, before inclination, in which the waterproofing construction method of the third embodiment of the present invention is implemented. Figure 15 is a longitudinal cross-sectional view of the same portion as Figure 14, showing the state when the suspension device 43 is attached as a support means. Figure 16 is a longitudinal cross-sectional view of the same portion as Figure 14, showing the state when both ends of the portion of the cable tray 6 inside the through-holes 3 are removed from the remaining portion. Figure 17 is a longitudinal cross-sectional view of the same portion as Figure 14, showing the state in which the cable tray 6 is inclined by temporarily suspending and supporting it with the suspension device 43. Note that the support means is not limited to the suspension device 43 as shown in Figure 14, and a method of lifting from below, such as using a jack or other lifting device, may be used to support the portion of the cable tray 6 inside the through-holes 3 at both ends in the longitudinal direction.

[0050] As shown in Figures 14, 15, 16, and 17, the joints 40 at both ends of the length D of portion 6A of the cable tray 6 located within the through-hole 3 are detachably joined to the remaining portion 6B of the cable tray 6.

[0051] In Figure 14, the portion 6A within the through-hole 3 of the cable tray 6 is formed to be slightly longer than the length of the through-hole 3. As a result, both ends of the portion 6A within the through-hole 3 in the cable tray length direction D protrude slightly outward from the openings at both ends of the through-hole 3. These protruding ends are detachably connected to the remaining portion 6B.

[0052] The waterproofing method for the cable tray 6 according to the third embodiment can be applied to existing equipment where the cable tray 6 is already installed in a horizontal position.

[0053] In Figure 15, both ends of the portion 6A within the through-hole 3 of the cable tray 6 are suspended by suspension devices 43.

[0054] Next, in Figure 16, the remaining portions 6B are separated from the joint portions 40 at both ends in the longitudinal direction of portion 6A within the through hole 3.

[0055] Next, in Figure 17, one end of portion 6A in the longitudinal direction within the through-hole 3 is lifted up by the suspension device 43, and conversely, the other end in the longitudinal direction is lowered by the suspension device 43. This causes portion 6A within the through-hole 3 of the cable tray 6 to be tilted at a certain angle θ such that one end of portion 6A is higher than the other end.

[0056] When a portion 6A within the through-hole 3 of the cable tray 6 is tilted at a certain angle θ, liquid sealant 21 is poured in through an opening on one side (the higher side) of the tilted portion 6A and allowed to harden. This seals the portion 6A within the through-hole 3 of the cable tray 6.

[0057] The cable tray 6 located on the lower side is also tilted using the suspension device 43, similar to the cable tray 6 on the upper side, and the sealing material 21 is poured in through the opening at one end of section 6A of the cable tray 6 and allowed to harden.

[0058] The inclined portion 6A of the cable tray 6, which is filled with sealing material, is returned to a horizontal position and joined to the remaining portion 6B by appropriate joining means.

[0059] The method according to the third embodiment allows for easy filling of the portion 6A of the cable tray 6 within the through-hole 3 with the sealing material 21, even in existing equipment where the cable tray 6 is already installed horizontally within the through-hole 3.

[0060] [Other embodiments] (1) In the third embodiment described above, both ends of the portion 6A in the cable tray length direction within the through hole 3 are suspended and supported by a pair of suspension devices 43, as shown in Figure 17. However, the present invention is not limited to this configuration. For example, it is also possible to cantilever support only one end of the portion 6A in the through hole 3 with the suspension device 43, and tilt the portion 6A in the through hole 3 by lifting only the one end. In this case, a jack can be used instead of the suspension device 43 as a support means to push up only one end of the portion 6A and maintain the portion 6A in an inclined position.

[0061] (2) In the second embodiment described above, the conduit 30 is embedded in the second wall 2 as shown in Figure 9, but the present invention is not limited to such a configuration. For example, the diameter of the through hole 3 is formed to be slightly larger than the outer diameter of the conduit 30, and the conduit 30 is arranged with sufficient space within the through hole 3 or the sleeve embedded in the through hole 3. In that case, both ends or one end of the conduit 30 in the longitudinal direction are supported by a support means such as a suspension device, and the conduit 30 is maintained in an inclined position by operating the suspension device.

[0062] (3) The present invention is also applicable to cable trays having a ladder-shaped base. In this case, a backing plate can be fixed to the lower surface of the base, as shown in Figure 18.

[0063] (4) In the embodiments described above, only cables with a circular cross-section were shown inside the cable tray or conduit, but the method can also be applied to structures where various shapes are mixed, such as cables with an elliptical cross-section or a snowman shape. Of course, it can also be applied to structures that house several or more than ten cables.

[0064] (5) The embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0065] 1. The First Wall 2. The Second Wall 3 Through hole 5 Cables 6 Cable tray Part inside the through-hole of cable tray 6A 6B Remaining part of cable tray 6 10 Weir 11 Lid 21 Liquid sealant 30 Conduit 31 Weir 40 Joint 43. Suspension device (an example of a support means)

Claims

1. In a method for waterproofing a cable tray, in which a cable tray containing multiple cables is inserted through a through-hole formed in the wall of a building, a sealant is poured into the inside of the cable tray, and the inside of the cable tray is sealed by hardening the poured sealant, Prior to the pouring step, the portion of the cable tray within the through-hole is maintained in an inclined position such that one side of the cable tray in the longitudinal direction is higher than the other side. A method for waterproofing a cable tray, wherein in the pouring step, the sealing material is poured into the inclined portion within the through hole from one side.

2. The method for waterproofing a cable tray according to claim 1, wherein cables of various outer diameters or shapes are mixed together in the cable tray.

3. The method for waterproofing a cable tray according to claim 1 or 2, wherein a weir is formed at the other end in the longitudinal direction of the inclined portion of the cable tray within the through hole to prevent leakage of the sealing material.

4. The method for waterproofing a cable tray according to claim 1 or 2, wherein a lid is attached to the upper opening of the inclined portion within the through hole of the cable tray.

5. The portion of the cable tray within the through-hole is detachable from the rest of the cable tray at both ends in the longitudinal direction. The method for waterproofing a cable tray according to claim 1 or 2, wherein the portion of the cable tray within the through hole is supported at both ends in the longitudinal direction by support means and is tilted by operation of the support means.

6. The method for waterproofing a cable tray according to claim 5, wherein the support means is a suspension device that suspends both ends in the longitudinal direction of the portion of the cable tray within the through hole.

7. The portion of the cable tray within the through-hole is such that one end in the longitudinal direction is removable from the rest of the cable tray. The method for waterproofing a cable tray according to claim 1 or 2, wherein the portion of the cable tray within the through hole is supported at one end in the longitudinal direction by a support means and is tilted by operating the support means.

8. In a method for waterproofing electrical conduits, in which a conduit containing multiple cables is embedded in a through-hole formed in the wall of a building, and a sealant is poured into the conduit and the inside of the conduit is sealed by hardening the poured sealant, The conduit is maintained in an inclined position such that one side in the longitudinal direction of the conduit is higher than the other side. A method for waterproofing electrical conduits, wherein in the step of pouring in the sealing material, the sealing material is poured in from one side of the electrical conduit.

9. The method for waterproofing an electrical conduit according to claim 8, wherein cables of various outer diameters or shapes are mixed together inside the electrical conduit.

10. A method for waterproofing an electrical conduit according to claim 8 or 9, wherein a weir is formed at the other end of the electrical conduit in the longitudinal direction to prevent leakage of the sealing material.

11. In a method for waterproofing electrical conduits, in which an electrical conduit containing multiple cables is placed in a through-hole formed in the wall of a building or in a sleeve embedded in the through-hole, and a sealant is poured into the inside of the electrical conduit and the inside of the electrical conduit is sealed by hardening the poured sealant, The conduit is maintained in an inclined position such that one side in the longitudinal direction of the conduit is higher than the other side. A method for waterproofing electrical conduits, wherein in the step of pouring in the sealing material, the sealing material is poured in from one side of the electrical conduit.

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