JPS58207498A - Structure of underground pile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an underground mine in which a section using the shield method and a section using the NATMT method are successively formed.

It takes several tens of meters to lay urban power lines, telephone lines, etc. underground.
The method is to use the shield method to excavate a horizontal shaft to a depth of 1,000 ft and use it as a communal shaft. In this case, if the horizontal shaft and the vertical shaft are connected by a diagonal shaft using the NAT]Vf construction method, that is, the rock bolt construction method, there is no need to dig the vertical shaft so deeply, which is advantageous in terms of costs.

In addition, when constructing an underground shaft with curved parts, it is difficult to form it using only the shield method, so
Generally, the straight sections are formed using the shield method, and the sections created using the shield method are connected using the NATM method.

However, when a section using the shield method and a section using the NATM method are constructed consecutively, the water stop structure at the connection part is different due to the difference in construction method, so water springs on the back side of the water stop sheet installed in the NATM method section. However, there was a problem in that water flowed from the connection between the two sections to the secondary lining side, which could easily lead to water leakage accidents.

The present invention has been made in view of the above-mentioned points, and at the junction between the shield construction method section and the NA TMT method section, spring water on the back side of the water stop sheet flows to the secondary lining side. The purpose of this project is to create an underground mine structure that is free from the risk of damage, using simple and inexpensive work.

In other words, the present invention provides sections using the shield method and NAT
In the structure of an underground mine where a section formed by the M I method is formed in succession, the end of the water stop sheet attached to the section formed by the NATMT method is in the inner cavity of the shield machine outer shell in the section formed by the shield method. The water stop sheet is extended, and the end of the water stop sheet is airtightly joined to the inner wall surface of the outer shell of the shield machine.

Next, a first embodiment of the structure of an underground shaft according to the present invention will be described with reference to FIGS. 1 to 3 of the drawings.

In the figure, 1 is a vertical shaft, and 2 is a horizontal shaft using the shield construction method that communicates with another vertical shaft (not shown), and the NA between this horizontal shaft 2 and the vertical shaft 1 is They are connected by a diagonal shaft 3 using the TM construction method. ” - The horizontal shaft 2 is primarily lined with a shield machine outer shell 4 and a shield segment 40 following this shield machine outer shell 4, and the above-mentioned inclined shaft 3 is lined with a shotcrete layer 5 and rock bolts 6. The primary lining has been completed using the Austrian Tunneling Merit method for Yoro NATM. Furthermore, on the inner wall surface of the shotcrete layer 5 marked L, a water stop sheet 7 made of vinyl chloride resin, ethylene vinyl acetate resin, etc.
is pasted, and the sheets are discontinuous at the location indicated by the two dots @ line Tr in the figure, so an overlap sheet 8 is used as shown in FIG. That is, the above I
] The abutting portions 7a, 7a of the two ice water sheets are fixed to the inner wall surface of the concrete layer 5 by concrete nails 9, and the abutting portions 7a, 7a of the water sheet 7 are fixed to the inner wall surface of the concrete layer 5 including the concrete nails 9. While covered by the overlap sheet 8, both edges of the overlap sheet 8 are welded and connected to the clean water sheet 7.

On the other hand, the connection part between the horizontal shaft 2 made by the shield method and the inclined shaft 3 made by the Natom construction method, that is, the connection part ]0 is the inclined shaft 3.
The end 7b of the water stop sheet 7 is extended into the shield machine outer shell 4 of the horizontal shaft 2, and the end 7b of the water stop sheet 7 and the inner wall surface 4a of the shield machine outer shell 4 are airtight. is joined to. FIG. 3 shows the location indicated by the two-dot chain line ■■ in FIG. A connection plate 11 that is fixed to the inner wall surface 4a of the machine outer shell 4, a fixing build 12 that fixes the connection plate 11 and the end 7b of the water stop sheet 7, and a connection plate 11 and the water supply sheet at this bolt fixing part. The end 7b of the clean water sheet 7 and the inner wall surface 4 of the outer shell 4 of the shield machine are
The junction with a is made. In detail, the connecting plate 11 is a shaped member having a substantially S-shaped cross section, and a flat part 11a of the connecting plate 11 is fixed to the inner wall surface 4a of the shield machine outer shell 4 by welding or the like. The bolt 12 is inserted through the bridge-like floating flat portion 11b. The water stop sheet 7 extending from the inclined shaft 3 along the inner wall surface 4a further reaches the bolt fixing part along the connection plate 11, and here the end 7b of the water stop sheet 7
and a connecting plate 11 are secured with bolts 12 with a backing material 13 in between.

A secondary lining concrete layer 4 is continuously formed on the entire circumference of the inner wall surface 4a of the shield machine outer shell 4 and the inner circumference of the water supply sheet 7, as shown by the dotted chain line in the figure. There is.

The underground shaft with the above configuration is constructed by
Since water is cut off at the connection part 10 between the water cutoff sheet 7 and the inclined shaft 3, there is no risk that spring water on the back side of the water cutoff sheet 7 will flow to the secondary lining side.

Moreover, the construction can be done by simply extending the end 7a of the water-stop sheet 7 into the shield machine outer shell 4 and joining it, so the cost is low, and the inner wall surface is not affected by the secondary lining. , it is possible to obtain a high-quality underground shaft with a continuous inner wall surface.

Next, the second part of the structure of the underground shaft according to the present invention. The third embodiment will be explained with reference to FIGS. 4 and 5. In addition, this second. The third embodiment differs from the first embodiment described above only in the structure of the joint between the end 7b of the waterstop sheet 7 and the inner wall surface of the shield machine outer shell 4. The explanation of is omitted.

The second embodiment shown in FIG.
A connecting flat sheet 2 is attached to the joint between the shield machine b and the inner wall surface 4a of the shield machine outer shell 4, and this flat sheet 21 is made of a thermoplastic resin sheet such as vinyl chloride. One end of the flat sheet 21 is overlapped and welded to the end 7b of the water seed door 11, and the other end is airtightly adhered to the inner wall surface 4a of the shield machine outer shell 4 with a hot-melt adhesive 22. has been done.

In the third embodiment shown in FIG. 5, a wire mesh 31 is welded and stretched on the inner wall surface 4b of the shield machine outer shell 4.
A shotcrete layer 32 is formed by spraying concrete over the sprayed concrete layer 32, and the end 7b of the water stop sheet 7 is fixed to the inner wall surface 32a of the shotcrete layer 32. The end 7b of the water stop sheet 7 is fixed to the inner wall surface 32a of the shotcrete layer 32 and the end 7b of the city water sheet 7.
a backing material 33 such as rubber interposed between
It is made up of a holding metal fitting 34 attached to the back side of the holding metal fitting 34, and a concrete nail 35 that is driven into the shotcrete layer 32 through this holding metal fitting 34, the ends 7b and 7b of the ice water sheet, and the sticking material 33. There is.

As explained above, according to the present invention, the end of the water stop sheet installed in the NA and TMT method sections is extended into the inner cavity of the shield machine outer shell, and the end of the water stop sheet and the shield machine outer shell are extended. The structure has an airtight connection with the inner wall of the
- At the stage of secondary lining, water is stopped at the connection between the shield construction method section and the NA TM construction method section, and there is an effect that there is no risk that spring water on the back side of the water stop sheet will flow to the bottom of the secondary lining. Moreover, it can be constructed by simply extending the edge of the water-stop sheet into the outer shell of the shield machine and joining it, which reduces costs and prevents the inner wall surface from being affected by the secondary lining. Therefore, it is possible to obtain a high-quality underground shaft with a smooth and continuous inner wall surface.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of an underground mine according to the present invention, FIG. A cross-sectional view of the location indicated by the two-dot chain line ■,
FIG. 4 is a sectional view showing the second embodiment at the location shown in FIG. 3, and FIG. 5 is a sectional view showing the third embodiment. 2... Horizontal shaft as a shield method section, 3... NA
Diagonal shaft as TM construction method section, 4... Shield machine outer shell,
4a... Inner wall surface of shield machine outer shell, 7... Water stop sheet, 7b... End of water stop sheet. Patent applicant CI Kasei Co., Ltd.

Claims (1)

[Claims] In the structure of an underground mine where a section by the shield method and a section by the NATMT method are formed in succession, the above NA
The end of the water stop sheet installed in the section using the TMT method is extended into the inner cavity of the shield machine outer shell in the section using the shield construction method, and the end of this water stop sheet and the inner wall surface of the shield machine outer shell are airtight. An underground mine structure characterized by being joined.