JPH04343921A - Water-proof construction method of underground external wall - Google Patents

Abstract

PURPOSE:To dispense with the removal of a formwork, achieve great labor saving and improve water stopping performance with a combined water conveyance system using a PC plate and a non-woven fabric by building a PC driven formwork with the permeable non-woven fabric formed on the back and then placing a solid concrete to construct an underground external wall while using the PC driven formwork as the inside wall. CONSTITUTION:A permeable non-woven fabric 20 is attached to the back of a PC plate 18 to construct a PC driven formwork 16. The PC driven formwork 16 is built into a position where an inner wall is formed and a solid concrete is placed therein to form the PC driven formwork 16 as the inside wall and the placed solid concrete as an underground external wall 22. Under the non- woven fabric 20 laid between the PC plate 18 and the underground external wall 22, a drain 24 leading to a catchment pit 12 is formed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method for underground outer walls.

0002

2. Description of the Related Art Conventionally, as a method of waterproofing the outer walls of underground structures, there is a method shown in FIG. 3, for example. That is, in this waterproofing method, a waterproof mortar 3 is applied to the inside of an outer wall 1 of a frame constructed underground, a hollow layer 7 is left in place, and a concrete block wall 2 is provided to form a double wall. A groove 4 is provided in the lower part of the hollow layer 7, and the water that has entered from the outer wall 1 of the frame is flowed into the groove 4, and a water collection pit 6 is connected to the groove 4 through a drainage channel 5 provided in the groove 4.
The water is discharged to the outside from this water collection pit 6.

0003

[Problems to be Solved by the Invention] However, in such conventional waterproofing method, a concrete block wall 2 is provided inside the outer wall 1 of the building frame to form a double wall. Construction requires a great deal of time and effort as it is necessary to stack a large number of single blocks, and coupled with the complexity of this work,
The construction period will be prolonged. Furthermore, the level of skill of the worker greatly influences the construction of the concrete block wall 2.

[0004] Further, as an example of applying this type of waterproofing method, for example, Japanese Patent Laid-Open No. 60-59234 (Int.
．． Cl. E02D 31/02) or JP-A-62-2
Publication No. 33344 (Int.Cl.E02D 31/0
2) has been disclosed. Incidentally, the inner wall surface of these walls is made of concrete, but conventionally, to construct this concrete wall, a formwork made of plywood or steel plate is erected and concrete is poured into the formwork.

[0005] However, when formwork such as the above-mentioned plywood is used, many thick timbers and supports are used to reinforce the formwork, and the formwork must be removed after the poured concrete has hardened. There is a need to. Therefore, in order to complete the inner wall, a large amount of labor is required not only to erect the formwork but also to remove the formwork and install and remove end pieces and shoring. Therefore, similar to the waterproofing method shown in FIG. 3, there is a problem in that the construction period is significantly prolonged.

[0006] In view of such conventional problems, the present invention uses a PC (precast concrete) pouring formwork with a non-woven fabric attached to the back side to construct an underground outer wall of an underground building, and also The purpose of the present invention is to provide a waterproofing construction method for an underground outer wall that can significantly save labor and improve water-stopping performance by using the inner wall as the inner wall.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a PC casting formwork with a water-permeable nonwoven fabric attached to the back side, and uses this PC casting formwork to form an underground external wall to be constructed. By placing concrete on the outside of this PC casting formwork, an underground outer wall is constructed, and a drainage channel leading to a water collection pit is formed below the nonwoven fabric.

[0008]

[Function] According to the waterproofing method for underground external walls of the present invention with the above configuration, a PC cast formwork with a non-woven fabric attached to the back side is erected, and the underground external wall is constructed using concrete poured on the outside of this PC cast formwork. Can be built. At this time, the PC cast formwork becomes an inner wall of the underground outer wall, and the underground outer wall and the inner wall form a double wall with the nonwoven fabric interposed therebetween. Therefore, water that has entered through the underground outer wall can be blocked by the PC cast formwork, and this blocked water is guided downward while penetrating the nonwoven fabric, and then flows into the water collection pit via the drainage channel. Discharge.

By the way, since the PC casting form is used as the inner wall, there is no need to remove the PC casting form after the construction of the inner wall is completed. Moreover, since this PC driving formwork has high rigidity, no thick material is required when erecting the PC driving formwork. Therefore, since there is no need to remove the formwork or attach or remove the end pieces, significant labor savings can be achieved.

0010

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figures 1 and 2 show an embodiment of the underground outer wall waterproofing method according to the present invention, with Figure 1 being a cross-sectional view of the main part, and Figure 2 being Figure 1.
FIG. 2 is an enlarged cross-sectional view of the main part of the middle A part.

That is, in the underground outer wall waterproofing method of this embodiment, a frame base 14 with a water collection pit 12 formed therein is constructed in an underground portion 10 excavated for constructing an underground structure, and the frame base 14 is A PC casting formwork 16 is built into the peripheral edge of the upper surface. At this time, the PC casting formwork 16 is built with a predetermined space provided between it and the inside of the underground portion 10. At this time, the PC driving formwork 16 is fixed in a vertical position using shoring. Note that the shoring will be removed after the construction of the underground outer wall 22, which will be described later, is completed.

As shown in detail in FIG. 2, the PC pouring formwork 16 is made by making the outer formwork into a flat plate and pouring concrete into it.
Water permeable non-woven fabric 2 before the concrete hardens.
0 is embedded approximately half into the concrete surface in the thickness direction. Incidentally, even if the nonwoven fabric 20 has water permeability, it is desirable that it not cause clogging due to concrete paste.

After the PC pouring form 16 is erected, concrete is poured into the outside of the PC pouring form 16, that is, in the space between the PC pouring form 16 and the underground portion 10. The concrete is poured and hardened to construct the underground outer wall 22. At the stage when the underground outer wall 22 is constructed, the nonwoven fabric 20 is sandwiched between the underground outer wall 22 and the PC plate 18.

Furthermore, a plurality of drainage channels 24 are formed at the upper peripheral edge of the frame base 14, one end of which opens at the lower end of the nonwoven fabric 20, and the other end of which opens into the water collection pit 12. Note that after the PC pouring formwork 16 is erected, lightweight concrete 26 that will become the floor surface is constructed.

[0015] With the above-described construction, in the waterproofing method for underground external walls of this embodiment, by pouring concrete for the framework on the outside of the PC pouring form 16 on which the nonwoven fabric 20 is formed on the back side, the poured concrete is The underground outer wall 22 can be easily constructed. Further, the PC casting formwork 16 is used as an inner wall of the underground outer wall 22, and the underground outer wall 22 and the PC casting formwork 16 form a double wall with the nonwoven fabric 20 interposed between them. do.

Therefore, when water enters from the underground outer wall 22, this water can be blocked by the PC casting formwork 16. Then, the water blocked by the PC casting formwork 16 penetrates into the nonwoven fabric 20, and in this way, the nonwoven fabric 2
The water that has permeated into the nonwoven fabric 20 is gradually guided downward through the nonwoven fabric 20. On the other hand, since a drainage channel 24 leading to the water collection pit 12 is formed at the lower end of the nonwoven fabric 20, the permeated water can be discharged to the water collection pit 12 via this drainage channel 24. Therefore, in combination with the excellent watertightness of the PC plate 18 and the excellent water permeability of the nonwoven fabric 20, the watertightness of the underground outer wall 22 can be significantly improved.

By the way, since the PC casting form 16 is used as an inner wall, there is no need to remove the PC casting form 16 after the construction of this inner wall is completed. In addition, since this PC pouring formwork 16 is formed by hardening concrete into a plate shape, it has high rigidity.
Even when erecting the C-driving formwork 16, the thick timbers conventionally used are unnecessary.

Therefore, as the inner wall of the underground outer wall 22, the PC
By using the driving formwork 16, there is no need for removing the formwork and attaching and removing end pieces, which were conventionally performed, and it is possible to achieve significant labor savings on site. In addition, since the PC-driven formwork 16 is produced in bulk at a factory or the like, it is possible to ensure the uniformity of the product and the smoothness of the surface finish. Since this method does not require as much surface finishing of the inner wall and can omit the surface finishing of the inner wall, it is possible to sufficiently deal with the current situation of labor shortage.

[0019]

Effects of the Invention As explained above, in the waterproofing method for underground external walls of the present invention, a water-permeable nonwoven fabric is attached to the back side of the PC driving form used for constructing the underground external wall. Since the frame was constructed as an inner wall,
Since there is no need to remove the formwork after the construction of the inner wall is completed, and there is no need to finish the surface of the inner wall, it is possible to achieve significant labor savings and significantly shorten the construction period. can.

[0020] Furthermore, since the PC-driven formwork can ensure product uniformity, construction workers on the site do not need to be very skilled when constructing internal walls, and this can adequately address the current labor shortage. be able to.

[0021]Furthermore, by combining a water guiding system using a PC board with excellent watertightness and a nonwoven fabric with water permeability, various excellent effects such as significantly improving the water-stopping properties of the underground outer wall can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an example of an underground outer wall constructed using the waterproofing method according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of section A in FIG. 1;

FIG. 3 is a sectional view of a main part of an underground outer wall showing a conventional waterproofing method.

[Explanation of symbols]

12 Water collection pit 16 PC driven formwork 18 PC version 20 Non-woven fabric 22 Underground outer wall 24 Drainage channel

Claims (1)

[Claims] Claim 1: Provide a PC pouring formwork with water-permeable nonwoven fabric attached to the back side, erect this PC pouring formwork inside the underground external wall to be constructed, and place concrete on the outside of this PC pouring formwork. A waterproofing method for an underground external wall, characterized in that the underground external wall is constructed by pouring a non-woven fabric, and a drainage channel leading to a water collection pit is formed in the lower part of the non-woven fabric.