JPS6361480B2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a section using a shield method,
This relates to the structure of an underground mine where sections are formed continuously using the NATM construction method.

For laying urban electric wires, telephone lines, etc. underground,
The method is to excavate a horizontal shaft several tens of meters deep using the shield method and use it as a communal shaft. In this case, if the horizontal shaft and vertical shaft are connected by an inclined shaft using the NATM construction method, that is, the rock bolt construction method, it is advantageous in terms of cost, as there is no need to dig the vertical shaft so deeply.

In addition, when constructing an underground shaft with curved sections, it is difficult to form it using only the shield method, so the straight sections are formed using the shield method, and the sections created using the shield method are connected to each other.
The structure is generally connected using the NATM construction method.

However, sections using the shield method and NATM
If sections are constructed using different construction methods, the water stop structure at the connection will differ due to the difference in construction methods.
There was a problem in that spring water on the back side of the water stop sheet installed in the NATM construction method section would flow from the connection between the two sections to the secondary lining side, easily causing a water leakage accident.

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 NATM construction method section, the 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 shaft structure that does not have the risk of rotation, using simple and inexpensive work.

That is, the present invention provides an underground shaft structure in which a section formed by the shield method and a section formed by the NATM method are formed in succession, and the end of the waterstop sheet attached to the section formed by the NATM method is connected to the section formed by the shield method. The water stop sheet extends into the inner cavity of the outer shell of the shield machine, 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 and connects with another vertical shaft (not shown).
They are connected by diagonal shaft 3 using the NATM construction method. The horizontal shaft 2 is primarily lined with a shield machine outer shell 4 and a shield segment 40 following the shield machine outer shell 4, and the above-mentioned inclined shaft 3
The primary lining was performed using the NATM (New Austrian Tunneling Merit) construction method using a shotcrete layer 5 and lock bolts 6. Furthermore, a water stop sheet 7 made of vinyl chloride resin, ethylene vinyl acetate resin, etc. is adhered to the inner wall surface of the shotcrete layer 5 all around, and the sheets are discontinuous at the locations indicated by chain double-dashed lines in the figure. Therefore, an overlap sheet 8 is used as shown in FIG. That is, the abutted portions 7a, 7a of the water stop sheet 7 are fixed to the inner wall surface of the shotcrete layer 5 by concrete nails 9, and the abutted portions 7a, 7a of the water stop sheet 7 including the concrete nails 9 are overlaid. While covered by the overlap sheet 8, both ends of the overlap sheet 8 are welded to the water stop sheet 7.

On the other hand, in the connection part 10 between the horizontal shaft 2 formed by the shield construction method and the slope shaft 3 formed by the Natom construction method, the end 7b of the water stop sheet 7 of the slope shaft 3 is connected to the horizontal shaft 2.
The end 7b of the water stop sheet 7 and the inner wall surface 4a of the shield machine outer shell 4 are hermetically joined. FIG. 3 shows the locations indicated by the two-dot chain line in FIG.
In this embodiment, the connection plate 11 is fixed to the inner wall surface 4a of the shield machine outer shell 4, and the connection plate 11 and the end 7b of the water stop sheet 7 are fixed. The water stop sheet 7 is fixed by the fixing bolt 12 and the packing material 13 such as rubber, which is tightly interposed between the connection plate 11 and the end 7b of the water stop sheet 7 at the bolt fixing part.
The end 7b is joined to the inner wall surface 4a of the shield machine outer shell 4. 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 1 is attached to the flat part 11b floating like a bridge.
2 is inserted. Thus, the water stop sheet 7 extends from the inclined shaft 3 along the inner wall surface 4a.
further extends along the connecting plate 11 to the bolt fixing portion, where the end 7b of the water stop sheet 7 and the connecting plate 11 are secured with bolts 12 with packing material 13 in between.

A secondary lining concrete layer 14 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 stop sheet 7, as shown by the dashed line in the figure.

In the underground shaft with the above configuration, water is cut off at the connecting part 10 between the side shaft 2 and the inclined shaft 3 at the stage of primary lining, so spring water on the back side of the water stop sheet 7 is prevented from flowing through the secondary lining. There is no risk of it being transferred to the engineering 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, second and third embodiments of the structure of an underground shaft according to the present invention will be described with reference to FIGS. 4 and 5. The second and third embodiments differ from the first embodiment described above only in the structure of the joint between the end 7b of the water stop sheet 7 and the inner wall surface of the shield machine outer shell 4, and are otherwise the same. Therefore, explanation of the equivalent parts will be omitted.

In the second embodiment shown in FIG. 4, a connection flat sheet 21 is attached to the joint between the end 7b of the water stop sheet 7 and the inner wall surface 4a of the shield machine outer shell 4, and this flat sheet 21 is A thermoplastic resin sheet such as vinyl is used. One edge of the flat sheet 21 is overlapped and welded to the edge 7b of the water stop sheet 7, and the other edge is hermetically bonded to the inner wall surface 4a of the shield machine outer shell 4 with a hot-melt adhesive 22. ing.

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, and a shotcrete layer 32 is formed by spraying concrete onto the wire mesh 31. 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 waterstop sheet 7 is fixed by a packing material 33 such as rubber interposed between the inner wall surface 32a of the shotcrete layer 32 and the end 7b of the waterstop sheet 7, A presser metal fitting 34 is attached to the back side of the end 7b of the waterstop sheet 7, and a concrete nail 35 is driven into the shotcrete layer 32 through the presser metal fitting 34, the end 7b of the waterstop sheet 7, and the packing material 33. It is made by

As explained above, according to the present invention, NATM
The end of the water stop sheet installed in the construction method section is extended into the inner cavity of the shield machine outer shell, and the end of the water stop sheet is airtightly joined to the inner wall surface of the shield machine outer shell. Water is stopped at the connection between the shield method section and the NATM method section during the primary lining stage, and there is no risk that spring water on the back side of the water stop sheet will flow to the secondary lining side. Moreover, it can be constructed by simply extending the end of the water-stop sheet into the shield machine's outer shell and joining it, which reduces costs and does not affect the inner wall surface due to 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 sectional view showing a first embodiment of an underground shaft according to the present invention, FIG. 4 is a sectional view showing the second embodiment at the location shown in FIG. 3, and FIG.
FIG. 2... Horizontal shaft as a shield method section, 3...
Diagonal shaft as NATM 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.

Claims (1)

[Claims] 1 In the structure of an underground mine where a section using the shield method and a section using the NATM method are formed in succession, the edge of the waterstop sheet attached to the section using the NATM method is outside the shield machine in the section using the above shield method. An underground mine structure characterized in that the water stop sheet extends into the inner cavity of the shell and the end of this water stop sheet is airtightly joined to the inner wall surface of the outer shell of the shield machine.