JPH11287083A - Connection structure of adit structure and shaft structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of the connection part of an adit structure and a shaft structure by forming an adit structure housing part on a socket member provided on an adit excavation start part, annularly forming, inserting and fitting an adit structure in a stress distribution transmission space between the inner peripheral face of the housing part and the outer peripheral face of the structure, and filling the space with buffering material. SOLUTION: A socket 6 is fixed by being projected and extended on a shield start/ arrival part 12 formed on the side wall part 2b of an adit structure in the direction of tunnel construction, and the rear end of an hollow cylindrical sleeve part 6b is fixed and formed on the shield start/arrival part 12 on the socket 6. The connection part 9 of a shield tunnel covering body 3 is inserted and fitted to a sleeve part 6b, and a clearance space formed between the outer peripheral face of the shield tunnel lining body 3 and the inner peripheral face of the sleeve part 6b is filled with a buffering material 20. Relative displacement is produced between the shield tunnel lining body 3 and the adit structure 3 by vibration of an earthquake, since stress applied on the connection part is acted through the buffering material 20 from the sleeve part 6b, the stress is dispersed, and breakage of the lining body 3 can be prevented to the utmost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal shaft structure and a vertical shaft structure connected to the horizontal shaft structure, which are hardly damaged by vibrations such as earthquakes, and to a connection structure between the horizontal shaft structure and the vertical shaft structure. It is.

[0002]

2. Description of the Related Art Conventionally, a shaft shaft structure forming a shield tunnel and the like, and a shaft structure having been connected to the shaft shaft structure have been constructed. With respect to these structures, when an earthquake or the like occurs, the vibration causes relative displacement between the horizontal shaft structure and the vertical shaft structure, and as a result, shearing occurs at the connection between the horizontal shaft structure and the vertical shaft structure. A force or the like is applied, and a stress such as a shearing force is concentrated particularly at a joint portion between the connecting portion and the shaft structure. Because shield tunnels and the like are usually formed from concrete members such as segment blocks, if the shearing force at the above-mentioned joints increases due to an earthquake or the like, the joints near the joints where stress is concentrated in the joints are damaged. There is a fear. For this reason, for example, a part of the connecting part of the horizontal shaft structure is formed of a flexible segment so as to eliminate the damage of the connecting part.

[0003]

However, the installation of the flexible segment is troublesome and time-consuming, and the flexible segment is an expensive member, so that the construction cost is high.

[0004] In view of the above circumstances, the present invention has a structure in which the connecting portion of the shaft structure is hard to be damaged, and furthermore, the construction time and labor are not required and the construction cost is not required. And a connection structure between the shaft and the shaft structure.

[0005]

According to a first aspect of the present invention, there is provided a shaft shaft (2) having a side shaft excavation / departure (12) formed on a side portion (2b). Excavation port (1
2) A socket member (6) is provided in the cross shaft construction direction, and a horizontal shaft structure housing portion (6b) is formed in the socket member (6) in a tubular shape in the cross shaft construction direction, and the horizontal shaft structure ( And 3) transmitting the stress dispersion between the inner peripheral surface of the horizontal shaft structure housing portion (6b) and the outer peripheral surface of the horizontal shaft structure (3) into the horizontal shaft structure housing portion (6b). The space (7) is provided so as to be inserted in a form of an annular shape, and a cushioning material (2) is provided in the stress dispersion transmitting space (7).
0).

According to a second aspect of the present invention, in the connection structure between the horizontal shaft structure and the vertical shaft structure according to the first invention, the cushioning member (20) is made of a material having a sealing performance. .

According to a third aspect of the present invention, in the connection structure between the cross shaft structure and the vertical shaft structure according to the first invention, the cross shaft structure (3) includes a plurality of segment blocks (3).
a) is assembled.

According to a fourth aspect of the present invention, in the connection structure between the cross shaft structure and the vertical shaft structure according to the first invention, the cross shaft structure (3) is formed in a cylindrical shape with a predetermined length. A plurality of formed concrete pipes are connected in series in the cross shaft construction direction.

Note that the numbers in parentheses are for convenience of indicating corresponding elements in the drawings, and therefore the present description is not limited to the description on the drawings.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a shield tunnel structure to which an example of a connection structure according to the present invention is applied, and FIG. 2 is a view showing one process when building the shield tunnel structure shown in FIG. .

In the ground 50, a shield tunnel structure 1 is constructed as shown in FIG. The shield tunnel structure 1 has a shaft structure 2 built in the ground 50, and the shaft structure 2 has a plate-like bottom portion 2a and a side wall portion 2b made of cast-in-place concrete or the like. The shield tunnel structure 1 has a shield tunnel lining body 3 buried in the ground 50 so as to extend in a substantially horizontal tunnel construction direction.
Is formed by assembling a plurality of segment blocks 3a made of a concrete material. (Although not shown, as another example, a portion of the shield tunnel lining 3 reaching the shaft is constituted by a skin plate of a shield excavator. May be.). A shield opening / closing portion 12 is formed on a side wall portion 2 b of the shaft structure 2, and a connection hole 5 is formed in the shield opening / closing portion 12 so as to pass through the inside and outside of the shaft structure 2 in a substantially horizontal direction. I have. In addition, a socket 6 is integrally fixed to the shield attachment / detachment portion 12 of the shaft shaft structure 2 so as to protrude and extend from the shield attachment / detachment portion 12 outward (to the left in FIG. 1) in a substantially horizontal tunnel construction direction. It is provided. The socket 6 has a hollow cylindrical sleeve portion 6b extending in a substantially horizontal tunnel construction direction.
The rear end (the right end in FIG. 1) of the sleeve portion 6b is fixed to the shield attaching / detaching portion 12. In addition,
The inside of the sleeve portion 6b is open at the front end side (left side in FIG. 1), and at the rear end side (right side in FIG. 1).
The connection hole 5 formed in the shield attachment / detachment portion 12 is connected to the connection hole 5 in the left-right direction of FIG.

The connection portion 9 of the shield tunnel lining body 3 near the right end in FIG.
Of the shield tunnel lining 3 is disposed so as to reach the position of the connection hole 5. A clearance space 7 is formed annularly between the outer peripheral surface of the shield tunnel lining body 3 and the inner peripheral surface of the sleeve portion 6b, and the clearance space 7 is formed of an elastic material (for example, low elasticity such as rubber). A member is preferable, but a buffer material 20 made of a material that exhibits a stress buffering property between the socket 6 and the shield tunnel lining body 3 is not limited to an elastic material. The material 20 is preferably a material that also has sealing performance.) In this embodiment, the cushioning material 20 is filled from the inside of the sleeve portion 6b to the inside of the connection hole 5 (of course, the cushioning material 20 is filled in the sleeve portion 6b).
It may be filled only inside. ). Further, between the shield tunnel lining body 3 and the sleeve portion 6b, at the tip end portion of the clearance space 7 (the left end portion on the paper surface of FIG. 1),
A sealing material 21 made of an appropriate water-blocking material is provided so as to close the clearance space 7, and the connection hole 5 is similarly closed by closing the space between the shield attaching / detaching portion 12 and the shield tunnel lining 3. Is provided. Therefore, the cushioning material 20 between the shield tunnel lining body 3 and the sleeve portion 6b and the like is in a state of being sealed by the sealing materials 21 and 21.

The shield tunnel structure 1 is configured as described above. The shield tunnel structure 1 is constructed as follows. First, a shaft structure 2 for reaching the shield is constructed in the ground 50 by cast-in-place concrete or the like as shown in FIG. At the time of construction, a shield attaching / detaching portion 12 in which the vicinity of the center is a temporary wall 10 for reaching the shield is formed in the side wall portion 2b. Next, the ground 50 outside the side wall portion 2b is cut and the like, so that the shield attaching / detaching portion 1 is formed.
The socket 6 is constructed so as to be fixed to the base 2, and the constructed socket 6 is buried in the ground 50 and backfilled. On the other hand, shield excavation is advanced toward the shaft 2 while the shield tunnel lining body 3 is constructed in the ground 50 by a known shield excavator (not shown). By further proceeding with this shield excavation, the shield excavator (not shown) is connected to the sleeve 6b of the socket 6.
Then, the temporary wall 10 in the shield attachment / detachment portion 12 is broken to reach the inside of the vertical shaft structure 2 (the portion where the temporary wall 10 is broken becomes the connection hole 5 described above). The construction is completed by inserting the body 3 into the sleeve portion 6b. Next, between the shield tunnel lining body 3 and the sleeve portion 6b (or between the outer cylinder of the shield excavator (not shown) and the socket 6), the sleeve portion 6
At the front end portion b, a sealing material 21 is installed so as to close the clearance space 7 between the shield tunnel lining body 3 and the socket 6, and water is stopped. After that, the earth and sand around the shield tunnel lining body 3 (or around the outer cylinder of the shield excavator (not shown)) in the clearance space 7 and the connection hole 5 is removed from the shaft 2 side. After the removal of the earth and sand, the sealing material 2 is provided between the shield tunnel lining body 3 and the shield attachment / detachment portion 12 (or between the outer cylinder of the shield excavator and the shield attachment / detachment portion 12 not shown) at the connection hole 5.
1 is set. Next, between the shield tunnel lining 3 and the sleeve portion 6b, and between the shield tunnel lining 3 and the shield attaching / detaching portion 12, and thus the sealing material 21,
The portion enclosed by 21 is filled with the cushioning material 20. Thus, the construction of the shield tunnel structure 1 is completed.

In the above description, the shield tunnel structure 1 is constructed by constructing the socket 6 on the arrival shaft 2, but the socket 6 is constructed on the start shaft 2 by constructing the shield tunnel structure 1. May be constructed. That is, the shaft structure 2 for starting the shield is constructed in the same manner as the shaft structure 2 for reaching the shield described above. The vicinity of the center of the shield attaching / detaching portion 12 becomes a temporary wall 10 for starting the shield. Next, the socket 6 is constructed in such a manner as to be fixed to the shield attachment / detachment portion 12 by, for example, digging the ground 50 outside the side wall 2b, and backfilling the constructed socket 6 in the ground 50. Do. Thereafter, a known shield excavator (not shown) is installed in the shaft structure 2 and the temporary wall 1
Start by breaking 0 and proceeding in the horizontal direction. Accordingly, the shield excavator (not shown) moves while excavating in the ground 50 after passing through the sleeve portion 6b, and also extends in the ground portion 50 from the started shaft structure 2 through the sleeve portion 6b. The tunnel lining body 3 is constructed. After that, the sealing material 21 is provided between the shield tunnel lining 3 and the sleeve portion 6b, and the shield tunnel lining 3
The earth and sand between the and the sleeve portion 6b is removed from the shaft structure 2 side, and a seal member 21 is further provided between the shield tunnel lining body 3 and the shield attaching / detaching portion 12. After that, between the shield tunnel lining body 3 and the socket 6 and the like, the portion enclosed by the sealing materials 21 and 21 is filled with the cushioning material 20.

In the shield tunnel structure 1 constructed as described above, when an earthquake or the like occurs, a relative displacement occurs between the shield tunnel lining body 3 and the shaft structure 2 due to the vibration. The connecting portion 9 of the lining 3 is subjected to stress such as shearing or bending.
However, this stress acts on the connecting portion 9 from the sleeve portion 6b of the socket 6 that is displaced relative to the shield tunnel lining body 3 together with the shaft structure 2, and the connecting portion 9 is formed by the socket 6. It will act through the cushioning material 20 over the entire length of the coating. Therefore, the stress is dispersed and does not concentrate locally, so that damage to the shield tunnel lining body 3 is prevented as much as possible.

As described in the parentheses in the description of the above-described embodiment, if the cushioning material 20 is also a material having a sealing property, the connection portion 9 of the shield tunnel lining 3 is not likely to be formed. Even when the connection portion 9 is damaged due to a large stress acting on it, the periphery of the connection portion 9 is sealed by the cushioning material 20 filled around the connection portion 9. It is convenient that water and the like in the shield tunnel lining body 3 do not leak to the outside, and conversely, groundwater and the like do not enter the tunnel.

In the above-described embodiment, the socket 6 is constructed in the shaft structure 2 and then the shield tunnel lining 3 is constructed in the socket 6. This procedure is also possible. For example, after constructing the shield tunnel lining body 3 so as to be connected to the shaft structure 2, the socket 6 is constructed so as to cover the connection portion 9 of the shield tunnel lining body 3, Cushioning material 20 between shield tunnel lining body 3
May be filled. Also, for example, after constructing the shield tunnel lining body 3 in the form of being connected to the shaft structure 2, a buffer material 20 is installed at the connection portion 9 of the shield tunnel lining body 3, and then the buffer material 20 Alternatively, the socket 6 may be constructed so as to cover the connection part 9.

Further, in the above-described embodiment, the shield tunnel lining body 3 is exemplified as the horizontal shaft structure. In addition, for example, the horizontal shaft structure is a structure (not shown) using a concrete pipe. You may. For example, a structure made of a concrete pipe is configured by connecting a plurality of concrete pipes formed in a cylindrical shape with a predetermined length in series in a substantially horizontal direction. Such a structure using a concrete pipe is constructed by, for example, a known propulsion pipe method.

[0019]

As described above, according to the first aspect of the present invention, a shaft such as a shaft structure 2 or the like in which a horizontal shaft excavation and arrival portion such as a shield attachment / detachment portion 12 is formed on a side portion such as a side wall portion 2b. A socket member such as a socket 6 is provided in the cross shaft excavation / departure portion in the cross shaft construction direction, and a horizontal shaft structure accommodating portion such as a sleeve portion 6b is provided in the socket member in the cross shaft construction direction. And forming a horizontal shaft structure such as the shield tunnel lining body 3 in the horizontal shaft structure accommodating portion, the inner peripheral surface of the horizontal shaft structure accommodating portion and the outer peripheral surface of the horizontal shaft structure. The stress dispersion transmitting space such as the clearance space 7 is inserted and provided in a ring-shaped manner, and the stress dispersion transmitting space is filled with a buffer material such as the buffer material 20. When this occurs, the vibration causes a relative displacement between the horizontal shaft structure and the shaft structure. Connections This adit structure 9
Is subjected to stress such as shearing and bending. However, this stress acts on the connection portion 9 from the socket member which is displaced relative to the cross shaft structure together with the shaft structure, and furthermore, the entire area in which the connection portion 9 is covered by the socket member. Through the cushioning material. Therefore, the stress is not concentrated on the joint portion P1 or the like but is dispersed in the length accommodating and covering the connecting portion 9, so that damage to the cross shaft structure is prevented as much as possible.
Moreover, according to the present invention, since complicated and expensive members such as flexible segments are not used at all as in the prior art, no labor and time are required for the construction and no construction cost is required.

According to a second aspect of the present invention, in the connection structure between the horizontal shaft structure and the vertical shaft structure according to the first invention, the buffer material is made of a material having a sealing performance. In addition to the effect of the first aspect, in the event that a large stress is inadvertently applied to the connecting portion 9 accommodated and covered by the socket member in the horizontal shaft structure, the connecting portion 9 may be damaged. Also, since the periphery of the connection portion 9 is sealed by the cushioning material, the fluid in the cross shaft structure leaks to the outside,
Alternatively, groundwater on the ground side does not enter the tunnel, which is convenient.

According to a third aspect of the present invention, in the connection structure between the cross shaft structure and the vertical shaft structure according to the first invention, the cross shaft structure includes a plurality of segment blocks such as the segment blocks 3a. Since it is assembled and configured, in addition to the effect of the first invention, it is not necessary to use a flexible segment as in the conventional case, so that it does not require much labor and time for construction, and does not require construction cost. I'm done.

According to a fourth aspect of the present invention, in the connection structure between the cross shaft structure and the vertical shaft structure according to the first invention, the cross shaft structure is formed in a cylindrical shape with a predetermined length. Since a plurality of concrete pipes are connected in series in the construction direction of the shaft, in addition to the effect of the first invention, measures for preventing damage to the structure of the shaft due to an earthquake or the like can be made easily and the construction cost can be reduced. It is convenient because it is realized without using.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a shield tunnel structure to which an example of a connection structure according to the present invention is applied.

FIG. 2 is a view showing one step in constructing the shield tunnel structure shown in FIG. 1;

[Explanation of symbols]

 2 Vertical shaft structure 2a Side (side wall) 3 Horizontal shaft structure (shield tunnel lining body) 3a Segment block 6 Socket member (socket) 6a Horizontal shaft structure accommodation Portion (sleeve portion) 7 Stress transmission space (clearance space) 12 Crosshole excavation / departure portion (shield departure portion) 20 Buffer material

Claims (4)

[Claims] 1. A shaft structure having a cross shaft excavation / departure portion formed on a side portion, a socket member provided in the cross shaft excavation / departure portion in a cross shaft construction direction, and a cross shaft structure accommodating in the socket member. Part is formed in a tubular shape in the cross shaft construction direction, the cross shaft structure, in the cross shaft structure accommodating portion, the inner peripheral surface of the cross shaft structure accommodating portion and the outer peripheral surface of the cross shaft structure A connection structure between a horizontal shaft structure and a vertical shaft structure, wherein a stress dispersion transmission space is inserted and provided so as to form a ring, and the stress dispersion transmission space is filled with a buffer material. 2. A connection structure between a horizontal shaft structure and a vertical shaft structure according to claim 1, wherein said cushioning material is made of a material having sealing performance. 3. The connection structure between a horizontal shaft structure and a vertical shaft structure according to claim 1, wherein said horizontal shaft structure is constructed by assembling a plurality of segment blocks. 4. The cross shaft structure according to claim 1, wherein the cross shaft structure is formed by connecting a plurality of concrete pipes formed in a cylindrical shape with a predetermined length in series in the cross shaft construction direction. Connection structure between horizontal shaft structure and vertical shaft structure.