JPS6012519B2 - Spring water collection and drainage equipment for tunnel construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology enables moat water gushing out on the ground surface of a tunnel to be reliably drained away by a drain pipe.

The present invention relates to a condensate collection and drainage system in which a vertical drainage material and a waterproof sheet are interposed between the primary shotcrete cast on the ground surface of a tunnel and the primary concrete lining thereon. {In particular, it is used for spring water collection and drainage equipment in tunnel construction, where a horizontal drainage space is formed by incorporating horizontal drainage material inside the water collection sheet that wraps around the hem of the waterproof sheet, making it possible to collect and drain water from a moat. This is related.

BACKGROUND ART Conventionally, there is a method called the NATM construction method as a construction method for forming equipment for treating artificial water that gushes out on the surface of the ground during tunnel construction.

In this construction method, primary shotcrete is placed on the ground surface of the tunnel, a waterproof sheet is placed on top of it, and then a main concrete lining is placed on top of it. Groundwater flows through the primary shotcrete from the ground surface and gushes out. The water is stopped by this waterproof sheet, and the water is guided downward by a vertical drainage material placed between the waterproof sheet and the primary shotcrete, such as a nonwoven fabric. Currently, the condensed water guided by the vertical drainage material is allowed to flow down to the roadbed as it is, or is allowed to flow back into the primary shotcrete, which has permeable properties.

For this reason, spring water remains under the concrete course even after it has been poured, and vibrations caused by trains passing through the tunnel after the tunnel is completed cause this spring water to seep onto the concrete course, causing the road surface to become wet. This has disadvantages such as causing road surface freezing in winter and corrosion of rails and cables. The purpose of this invention is to
This is to solve the problems of spring water collection and drainage equipment using the TM construction method, and by forming a horizontal drainage space at the hem of the waterproof sheet, "to eliminate the above drawbacks and direct spring water to drainage ditches on the roadbed etc." The purpose of the present invention is to provide a water collection and drainage facility for tunnel construction that enables reliable drainage.

The structure of the present invention in accordance with the above-mentioned purpose is that underground water gushing out through the ground surface of the tunnel and the primary shotcrete is stopped by a waterproof sheet, and is guided to a vertical drainage member and flows down. The gist of this system is that water is collected in the internal space of the horizontal drainage material within the water collection sheet and discharged to a drainage ditch on the roadbed through a drain pipe connected to the water collection sheet. be.

Next, embodiments of the present invention will be described below based on the drawings.

Fig. 3 shows a longitudinal sectional view of a tunnel in which the spring water collection and drainage equipment according to the present invention has been constructed, Fig. 2 is an enlarged sectional view of section A, and Fig. 3 is a side view of section A.

To explain according to the construction order, first, primary shotcrete 2 is placed on the surface of the ground 1 of the excavated tunnel.

Next, a waterproof sheet 3 is stretched over the surface of this primary shotcrete 2. A plurality of waterproof sheets 3 of a certain size are used to cover both side walls 2a of the primary shotcrete 2.
Then, cover the entire surface of the ceiling part 2b and fix it with a fastener pin or the like as appropriate. And the top waterproof sheet 3
After temporarily rolling up the hem part 3a upward and temporarily clamping it, as shown in Fig. 2, the comb form 4 is placed at a constant height position of the shotcrete 2 in the length direction of the tunnel, that is, as shown in the figure. Make it crawl in the depth direction.

Then, as shown in the enlarged view of FIG. 4, a presser plate 6 with the upper end of the waterproof sheet 5 wrapped around it is attached to the comb form 4, and a butyl rubber 7 is applied on top of the presser plate 6, and a fastener pin 8 is attached. to the primary shotcrete 2, and harden the upper surface of the comb form 4 with epoxy resin 9.Next, vertical drainage material 10 such as non-woven fabric is attached to the surface of the side wall portion 2a of the primary shotcrete 2 with fastener pins 11.
Fixed by

The vertical drainage materials 10' are long and have a constant width, and are hung vertically at regular intervals as shown in FIG. The vertical drainage material 1 has a horizontal drainage material 12 at its lower end.

This horizontal drainage material 12 is made of a cylindrical body that has a space inside and is water permeable, such as a loop-shaped Tetron.
It is sewn and connected to the lower end of the vertical drainage material 10.
After installing the vertical drainage material 10 and the horizontal drainage material 12, the hem 3a of the waterproof sheet 3 rolled up as described above.
hang down as shown in Figure 2.

Next, the horizontal drainage material 12, the reinforcing bars 13 for weights, and the hem 3a of the waterproof sheet are wrapped with the water collection sheet 5 attached by the fastener pin 8 as described above.
The tip 6a of the water collection sheet 5 is rolled up, connected to the surface of the waterproof sheet 3 with a butyl rubber tape 14, and fixed to the side wall 2a of the primary shotcrete 2 with a fastener pin 15.

Then, as shown in FIG. 3, the lower bag-shaped part of the water collection sheet 5 is cut open, and the drain pipe connection sheet 16 is adhered to the water collection sheet 5 using a butyl rubber tape 7, and the "fastener piso 181" is used for primary shotcrete. side wall part 2
Fix it to a.

Furthermore, a drain pipe 19 made of vinyl chloride is connected to the cylindrical portion 16a of the drain pipe connecting sheet 16 using butyl tape 201. A plurality of the drain pipes 19 are arranged at predetermined intervals,
The tip thereof is connected to a drainage groove 22 formed on the roadbed 21 as shown in FIG.

Next, as shown in FIGS. 1 and 5, the waterproof sheet 3 is lined with the main concrete 23, and the roadbed concrete 24 is placed on the roadbed to bury the drain pipe 19.

When the main concrete 23 is lined in this way, the waterproof sheet 3, the water collection sheet 5, and the vertical drainage material 1 will be compressed and interposed between the primary shotcrete 2 and the main concrete 23. The drainage passage 12a is secured inside the machine drainage material 12 without being compressed. In the spring water collection and drainage equipment constructed by the above construction method, groundwater gushing out from the ground 1 permeates through the primary shotcrete concrete 2 and oozes out onto the surface of the primary shotcrete concrete IJ 2.

This condensed water is stopped by the waterproof sheet 3 and is prevented from seeping into the main concrete 23. Then, the spring water is guided down by the vertical drainage material 10 interposed between the primary shotcrete 2 and the waterproof sheet 3, is caught by the bag-shaped part of the water collection sheet 5, and is trapped inside the horizontal drainage material 12. Space 12a
Stagnant within.

Further, the water in the horizontal drainage material 12 flows through the drain pipe 19 and is discharged into the drain groove 22 on the roadbed 21, and flows out of the tunnel through the drain groove 22.

Note that the aspect of the present invention is not limited to the above-mentioned embodiment, and the horizontal drainage member 12 may be a metal pipe having a large number of water holes on the circumferential surface. As described above, according to the present invention, the horizontal drainage material connected to the vertical drainage material is provided within the water collection sheet that wraps around the hem of the waterproof sheet, so even after lining the main concrete, the main concrete does not overlap. Since the internal space of the lateral drainage material is secured between the primary shotcrete concrete IJ-t and the surface of the primary shotcrete concrete, the dry water that gushes out on the surface of the primary shotcrete is reliably collected in this internal space, and the drainage pipes are used to drain the drains on the roadbed. It is ensured that it is discharged.

As a result, since spring water does not seep onto the concrete roadbed, it is possible to effectively prevent freezing of the road surface in winter, corrosion of rails and cables, etc.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view of a tunnel, FIG. 2 is a cross-sectional view showing part A of the tunnel during construction, and FIG. FIG. 2 is a right side view, FIG. 4 is an enlarged sectional view of the water collection sheet attachment part, and FIG. 5 is a sectional view showing part A when construction is completed. 1... Earth, 2... Primary shotcrete, 3...
・Waterproof sheet, 10...Vertical drainage material, 23...Main concrete, 3a...Hem of waterproof sheet, 5...Water collection sheet, 12...Horizontal drainage material, 19...Drain pipe . Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A waterproof sheet is placed on the inner surface of the primary shotcrete poured on the ground surface of the excavated tunnel, and a vertical drainage material is placed at a predetermined interval between the waterproof sheet and the primary shotcrete. In spring water collection and drainage equipment for tunnel construction in which concrete is lined on top of this waterproof sheet, a water collection sheet that wraps around the hem of the waterproof sheet is provided below the waterproof sheet, and this water collection sheet is A horizontal drainage material that is hollow inside and has water permeability is interposed therein, a lower end of the vertical drainage material is connected to the horizontal drainage material, and a drainage pipe is connected to the water collection sheet. Spring water collection and drainage equipment for tunnel construction. 2. Spring water collection and drainage equipment for tunnel construction according to claim 1, wherein the horizontal drainage material is a loop-shaped Tetoron.