JP3896003B2 - Connection method and structure of shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft connecting method and a connecting structure for connecting a shaft and a lateral tunnel.
[0002]
[Prior art]
Conventionally, when connecting a vertical tunnel and a horizontal tunnel such as a shield tunnel, the ground has been improved at the connecting location, and the connection work has been performed manually.
That is, a shield tunnel is constructed, a shaft is constructed up to the top of the shield tunnel, and the ground is improved near the lower end portion of the shaft. This ground improvement is to prevent the intrusion of groundwater and the like and to prevent the collapse of natural ground. After the ground improvement, a part of the shield tunnel was manually removed, and the shaft and shield tunnel were connected.
[0003]
[Problems to be solved by the invention]
However, such a connection method has a problem in that it takes time for construction to improve the ground and the like, and costs increase.
[0004]
This invention is made | formed in view of such a problem, The place made into the objective is to provide the connection method and connection structure of a shaft which can connect a shaft and a horizontal tunnel in a short period of time.
[0005]
[Means for Solving the Problems]
1st invention for achieving the objective mentioned above, (a) The process of constructing a shaft to the upper part of a horizontal tunnel planned position, (b) The process of filling mortar from the lower end of the said shaft, (c) A shaft connecting method comprising the steps of building a lateral tunnel while cutting a part of the mortar, and (d) connecting the shaft and the lateral tunnel. .
[0006]
The lateral tunnel includes a horizontal tunnel and an oblique tunnel, and the lateral tunnel is excavated by a shield machine or the like. Soil mortar or the like is used as the mortar. It is desirable to make the digging diameter of the part where the mortar is placed wider than the part of the shaft. Moreover, you may provide a connection part structure between a vertical shaft and a horizontal tunnel. When connecting the vertical shaft and the horizontal tunnel, a part of the segment of the horizontal tunnel is removed and the connection is performed.
[0007]
In the first invention, a vertical tunnel is constructed after a vertical shaft is constructed, and the vertical shaft and the lateral tunnel are connected. The mortar placed from the bottom of the shaft is used to prevent water stoppage and collapse of the natural ground.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1 to 8 relate to the first embodiment of the present invention. FIG. 1 is a schematic explanatory view of a shaft connecting method according to the first embodiment. FIGS. It is explanatory drawing which shows a connection method.
[0014]
In FIG. 1, reference numeral 1 denotes a ground surface, and a start shaft 5 and a reach shaft 7 are constructed in the ground 3. Further, a shaft 9 is constructed at an intermediate point between the starting shaft 5 and the reaching shaft 7. After constructing the shaft 9, a soil mortar 11 is driven from its lower end.
[0015]
Next, the shield tunnel 15 is constructed from the start shaft 5 by the shield machine 13. At this time, the shield machine 13 cuts a part of the soil mortar 11.
Then, the shield tunnel 15 and the shaft 9 are connected by human power or the like. In this case, the connecting portion is water-stopped by the soil mortar 11.
[0016]
Thus, the present embodiment provides a method for connecting the shaft 9 and the shield tunnel 15. Hereinafter, the details will be described with reference to FIGS.
2 to 5 show a construction method of the shaft 9. In the state shown in FIG. 2, the start shaft 5 and the reach shaft 7 may be constructed as described above, or the start shaft 5 and the reach shaft 7 may be constructed in parallel with the shaft 9.
[0017]
Moreover, after constructing the shaft 9, the start shaft 5 and the reaching shaft 7 may be constructed.
As shown in FIG. 2, a steel sheet pile 21 is provided at a place where the shaft 9 is to be constructed, and earthing is performed. A support pile 23 is provided in a section surrounded by the steel sheet pile 21. In the ground part, the ground is excavated for a while, and a gantry 25 supported by the support pile 23 is provided. The gantry 25 receives a reaction force when an excavator 31 and a segment liner 35, which will be described later, are laid down, and a suspension reaction force that prevents the segment liner from self-sinking.
[0018]
Next, as shown in FIG. 3, excavation is performed by an excavator 31. The excavator 31 has a drill bit at the lower end, and performs excavation by rotating the drill bit. The excavator 31 has a casing pipe 33, and the excavated earth and sand are discharged to the ground portion through the inside of the casing pipe 33. The excavator 31 has excavation blades, and the excavation diameter can be increased by expanding the excavation blades.
[0019]
As this excavator 31, for example, it is conceivable to use an omnidirectional free section excavator (Japanese Patent Laid-Open No. 2000-8780) or the like for which the applicant has already applied for a patent, but other excavators may also be used.
[0020]
While excavating the ground with the excavator 31, the segment liners 35 are set in the ground 3 one by one from the ground. The segment liner 35 has a cylindrical shape and is made of steel or reinforced concrete.
[0021]
The excavator 31 applies the propulsion reaction force to the segment liner 35. When sinking the segment liner 35, a jack (not shown) or the like is provided on the gantry 25, and the segment liner 35 is fed into the ground 3 by this jack.
As shown in FIG. 4, a segment liner 35 is provided around the excavated portion while excavating with the excavator 31.
[0022]
And in the lower end part of the shaft 9, the excavating blade (not shown) of the excavator 31 is widened to increase the excavating diameter, and the enlarged diameter part 32 is excavated.
[0023]
In this way, when the excavation and the setting of the segment liner 35 are completed, the soil mortar 11 is placed in the enlarged diameter portion 32 as shown in FIG. For example, a tremy pipe (not shown) is attached to the excavator 31 from the ground, and the soil mortar 11 is driven through this tremy pipe. The soil mortar 11 is a mixture of earth and sand excavated by the excavator 31 and mortar.
[0024]
The soil mortar 11 is filled in the expanded diameter portion 32 by driving the soil mortar 11 from the tremy pipe attached to the excavator 31 while raising the excavator 31 slightly to remove the excavator 31.
[0025]
Next, the shield machine 13 is started from the start shaft 5 and the shield tunnel 15 is constructed.
As shown in FIG. 6, the shield machine 13 constructs the shield tunnel 15 by arranging the segment 43 while cutting the portion of the soil mortar 11 below the shaft 9. That is, the portion of the soil mortar 11a is cut.
[0026]
When the shield tunnel 15 is constructed in this way, as shown in FIG. 7, a person enters the lower side of the shaft 9 and holds the portion of the soil mortar 11 between the segment liner 35 and the segment 43 of the shield tunnel 15. The connecting portion 45 is constructed. The connection part 45 is made of reinforced concrete.
[0027]
Furthermore, as shown in FIG. 8, the upper part of the segment 43 is removed, and the shaft 9 and the shield tunnel 15 are connected.
[0028]
7 and 8, when connecting the shaft 9 and the shield tunnel 15, the soil mortar 11 exists below the shaft 9, the water is stopped by the soil mortar 11, and the connecting portion 45 is constructed by human power. Then, the shaft 9 and the shield tunnel 15 are connected by removing the soil mortar 11 and the segment 43 from above. At this time, since the water is surely stopped by the soil mortar 11 and the connecting portion 45, it is not necessary to improve the ground.
[0029]
Thus, according to the present embodiment, the shaft 9 and the shield tunnel 15 can be connected in a short period of time without performing ground improvement.
The shield tunnel 15 is not limited to the horizontal direction, and may be a tunnel in an oblique direction.
[0030]
In this embodiment, the shield tunnel 15 is constructed by the shield machine 13 after constructing the shaft 9, but the shaft 9 may be constructed after the shield tunnel 15 is constructed first. In this case, the soil mortar 11 is placed above the segment 43 of the shield tunnel 15.
[0031]
Then, after placing the segment 43, a person enters the shaft 9 and performs operations such as removing the upper portion of the segment 43.
[0032]
Next, a second embodiment of the present invention will be described. FIG. 9 to FIG. 15 relate to the second embodiment, FIG. 9 is a schematic explanatory diagram of a shaft connection method according to the second embodiment, and FIG. 10 to FIG. It is explanatory drawing which shows the connection method with the shield tunnel.
[0033]
As shown in FIG. 9, a shaft 51 is constructed, and a soil mortar 75 is provided inside the shaft 51. The shield machine 13 is started from the start shaft 5, and the shield machine 13 constructs the shield tunnel 15 while cutting the portion of the soil mortar 75. Then, the shaft 51 and the shield tunnel 15 are connected by removing the upper part of the soil mortar 75 inside the shaft 51.
[0034]
Hereinafter, this connection method will be described in detail.
As shown in FIG. 10, a steel sheet pile 53 is provided in the ground 3. This steel sheet pile 53 performs earth retaining. The support pile 55 is provided in the section sandwiched between the steel sheet piles 53, and the upper portion of the section sandwiched between the steel sheet piles 53 is slightly excavated to construct the pedestal 57 supported by the support pile 55. The gantry 57 is constructed for lifting the rotating device 101. A lifting jack 59 is also installed. The lifting jack 59 is installed to sink the precast member 69.
[0035]
As shown in FIG. 11, excavation is performed by an excavator 61. The excavator 61 includes an excavation bit 63, excavation blades 65, a casing pipe 67, a rotation device 101, and the like. The excavation blade 65 is also provided with a bit, and excavation is performed by rotating the excavation bit 63 and the excavation blade 65 by the rotation device 101. The excavated earth and sand are discharged to the ground part through the casing pipe 67.
At the same time as excavation is performed by the excavator 61, a cylindrical precast member 69 is sunk from the ground part by one lot.
[0036]
And as shown in FIG. 12, it excavates to a predetermined position with the excavator 61, and the wall surface of the shaft 51 is constructed | assembled by sinking the ring-shaped precast member 69 in the excavated part.
[0037]
Next, as shown in FIG. 13, the excavator 61 is removed, the underwater concrete 71 is provided at the bottom of the shaft 51, and the bottom slab 73 is constructed in a state in which groundwater intrusion and board bulge are prevented. Soil mortar 75 is placed on the surface.
As in the first embodiment, a tremy pipe (not shown) is disposed from the ground, and underwater concrete 71, soil mortar 75, and the like are placed through the tremy pipe.
[0038]
After the soil mortar 75 is placed in this manner, the shield machine 13 is started from the start shaft 5 as shown in FIG. 9, and the shield tunnel 15 is constructed while cutting the shaft 51 by the shield machine 13.
[0039]
As shown in FIG. 14, the shield machine 13 constructs the shield tunnel 15 while arranging the segments 77. And the shield machine 13 cuts the part of the soil mortar 75 of the shaft 51. In addition, among the precast member 69 which comprises the wall surface of the shaft 51, the Nocast member etc. use the precast member 69 of the part cut with the shield machine 13. FIG. That is, the precast member 69 in this portion is precast concrete using carbon fiber, glass fiber, or the like as a reinforcing material instead of a reinforcing bar.
[0040]
Thus, by using the Nomst member, the precast member 69 can be directly cut by the shield machine 13.
Next, as shown in FIG. 15, a person enters the shaft 51, removes the upper portion 79 of the soil mortar 75 and removes the upper segment 78 of the segments 77.
[0041]
In this way, the shaft 51 and the shield tunnel 15 are connected.
Also in this embodiment, since the shaft 51 and the shield tunnel 15 can be connected without performing ground improvement or the like, the construction can be completed in a short period of time.
[0042]
The shield tunnel 15 is not limited to the horizontal direction, and may be an oblique tunnel as in the first embodiment.
[0043]
【The invention's effect】
As described above in detail, according to the present invention, the shaft and the lateral tunnel can be connected in a short period of time.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a shaft connection method according to a first embodiment of the present invention. FIG. 2 is a diagram showing a construction method for a shaft 9. FIG. 3 is a diagram showing a construction method for a shaft 9. [Fig. 5] Diagram showing the construction method of the shaft 9 [Fig. 5] [Fig. 6] Diagram showing the coupling method of the shaft 9 and the shield tunnel 15 [Fig. 7] [Method of connecting the shaft 9 and the shield tunnel 15] [Fig. FIG. 8 is a diagram showing a method for connecting the shaft 9 and the shield tunnel 15. FIG. 9 is a schematic explanatory diagram of a shaft connecting method according to the second embodiment of the present invention. FIG. 10 is a construction of the shaft 51. FIG. 11 is a diagram showing a construction method of the shaft 51. FIG. 12 is a diagram showing a construction method of the shaft 51. FIG. 13 is a diagram showing a construction method of the shaft 51. FIG. [Fig. 15] Vertical shaft 51 and shield tunnel Figure [EXPLANATION OF SYMBOLS] showing the connection method between 15
DESCRIPTION OF SYMBOLS 1 ... Ground surface 3 ... Ground 5 ... Starting shaft 7 ... Arrival shaft 9 ... Vertical shaft 11 ... Soil mortar 13 ... Shield machine 15 ... Shield tunnel 21 ... Steel sheet pile 23 ... Support pile 25 ... ····················································································································································································· 71 …… Underwater concrete 73 …… Bottom plate 75 …… Soil mortar 77 …… Segment 101 …… Rotating device

Claims (6)

(A) constructing the shaft up above the planned position of the horizontal tunnel;
(B) filling mortar from the lower end of the shaft,
(C) constructing a lateral tunnel while cutting a portion of the mortar;
(D) connecting the shaft and the lateral tunnel;
A method for connecting shafts, comprising: The shaft connection method according to claim 1, wherein the mortar is a soil mortar. 2. The shaft connection method according to claim 1, wherein, in the step (b), a drilling diameter of a portion where the mortar is placed is wider than a portion of the shaft. 2. The shaft connecting method according to claim 1, wherein in the step (c), the lateral tunnel is constructed by a shield machine. The method of connecting shafts according to claim 1, further comprising a step of providing a connection structure between the shaft and the lateral tunnel following the step (c). 2. The shaft connecting method according to claim 1, wherein in the step (d), a part of the segment of the lateral tunnel is removed.

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