JP2976830B2 - Joining method of shield excavator and reaching shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention, arrival and shield excavator
Regarding a method of joining with a reaching shaft, in particular, a shield excavator having a function of suppressing groundwater from flowing in from a gap between a reaching port and an outer peripheral surface of a skin plate when reaching the reaching shaft, and a reaching shaft And a joining method .

[0002]

2. Description of the Related Art In general, a shield excavator is started from a starting shaft and reaches a reaching shaft.
It is mainly used to construct a shield tunnel communicating between these shafts on soft ground where groundwater exists. The operation of the shield excavator to reach the reaching shaft is performed by penetrating the shield excavator to the reaching opening formed in the shaft of the reaching shaft.

That is, in this connection work, the ground around the reaching position of the shield excavator to the reaching shaft is previously solidified and improved by various ground improvement methods using an injection material such as cement or resin. In addition, when the shield excavator reaches near the reaching shaft, the shaft is stopped immediately in front of the shaft, and the shaft is removed from the inside of the shaft, for example, by removing the shaft from the inside, thereby substantially reducing the outer diameter of the shield excavator. This is done by opening an equal access port and then driving the shield jack to advance the shield excavator further and penetrate the access port. And the shield excavator that penetrated the access port generally stops while crossing the access port, for example, dismantling and removing cutters and other internal machinery while leaving all or part of the skin plate, and connecting Construction work of the lining body of the part and the tunnel entrance part is performed, and the connection work is completed.

[0004]

However, according to the above-mentioned conventional connection work, the ground around the arrival position of the shield excavator is solidified and improved by a ground improvement method before the vertical shaft wall is removed and removed. However, due to poor construction or subsequent excavation work by a shield excavator, the improved ground has cracks and overfilled areas, etc., and this creates an opening in the shaft wall. Then, groundwater often flows through a gap between the arrival port and the outer peripheral surface of the skin plate of the shield excavator.

[0005] As means for preventing the inflow of groundwater from the gap between the arrival port and the outer peripheral surface of the skin plate, conventionally, a cement system such as mortar or water glass, resin or the like has been used in such a gap. The method of injecting injection material such as a system as a water-stopping material has been adopted.However, in such a water-stopping method using the injection material, the injection material flows out from groundwater before it reaches a sufficient level, and the water-stopping effect is obtained. There was a problem that it was difficult to obtain quickly and sufficiently. .

Therefore, the present invention has been made in view of such a conventional problem, and when a shield excavator is penetratingly connected to an arrival port of an arrival shaft, a connection between the arrival port and the outer peripheral surface of the skin plate is made. It is an object of the present invention to provide a method for joining a shield excavator and a reaching shaft, which has a function of easily performing water stoppage between them.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and includes one or a plurality of ring-shaped seal grooves formed at predetermined positions on the outer periphery of a skin plate. A seal ring which is buried and fixed in the groove, which is hollow inside and is normally housed in the seal groove, and which expands and expands to the outer periphery of the skin plate by applying a fluid pressure to the hollow inside. Sea equipped
At the junction between the shaft excavator and the reaching shaft
Ground improvement is performed on the surrounding ground in advance, and the shield excavator
Moves toward the reaching shaft while cutting the improved ground
And from the inside of the arrival shaft,
Immediately before stopping through the formed arrival port,
Expand the seal ring and project it to the outer periphery of the skin plate
And the outer peripheral surface of the skin plate and the arrival port
The backfill material into the gap between the inner surface of the
And a method of joining a shield excavator and a reaching shaft, characterized by the following. Also, the skin plate
One or more ring-shaped shells formed at predetermined positions on the outer circumference
Inside the seal groove, the inner hollow
And is housed in the seal groove in a normal state, and the hollow
Expands skin by applying fluid pressure inside
Seal with a seal ring protruding on the outer circumference of the
Around the shaft wall at the junction between the
Make ground improvement in advance to the surrounding ground, and the shield excavator
Moving toward the reaching shaft while cutting the improved ground
And from the inside of the arrival shaft,
Immediately before stopping through the formed arrival port,
Inflates the ring to protrude outside the skin plate
And the ground improvement by the shield excavator
Peripheral surface of skin plate generated as extra part during cutting
The backfill material into the gap between the ground and the improved ground
Connecting shielded excavator and reaching shaft
The gist is the law.

[0008]

According to the shield excavator of the present invention,
For example, a shield excavator penetrates the arrival shaft of the arrival shaft,
When one or a plurality of ring-shaped seal grooves formed on the outer periphery of the skin plate move to a position corresponding to the thick portion of the shaft wall, fluid flows into the hollow seal ring housed in the seal grooves. By applying pressure, the seal ring expands and abuts against the inner surface or end surface of the arrival port, and presses this to close the gap between the arrival port and the outer peripheral surface of the skin plate. In addition to this, it is possible to suppress the inflow of groundwater and to easily perform such an injection operation even when an injection material is injected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing a connection state between a shield excavator according to the present invention and a reaching shaft, and FIG.
(A), (b) is a fragmentary sectional view which shows the water stop procedure by the excavator. In FIG. 1, a shield excavator 1 is provided with, for example, a rotary cutter 3 at a front portion of a skin plate 2, and a tunnel shaft 4 is provided at a rear portion of the shield excavator 1.
Then, a segment or cast-in-place concrete forming the lining body follows, and the tunnel body 4 is excavated by moving forward from the lining body while taking a reaction force through a shield jack (not shown).

The shield excavator 1 and the reaching shaft 5
At the joint portion with the ground, the ground E around the shaft wall 5a is subjected to ground improvement by mortar injection or the like in advance, and the shield excavator 1 advances toward the reaching shaft 5 while cutting the improved ground E1. And a shield excavator 1 formed from the inside of the arrival shaft 5 with the shaft 5a attached.
And stops through the arrival port 6 which is opened with a size substantially equal to the outer diameter of.

As shown in the enlarged view of FIG. 2 on the outer periphery of the skin plate 2 of the shield excavator 1, the shield excavator 1 stops reaching the arrival shaft 5 at a predetermined position. In the state, for example, at a position corresponding to the wall thickness portion of the arrival port 6, for example, at a portion located at the center of the thickness of the vertical shaft wall 5 a of the reaching shaft 5 and at a portion located at the rear end of the thickness (see FIG. 1), Two sealing grooves 2a along the entire circumference
In each of the seal grooves 2a, a seal ring 7 made of an elastic tube made of rubber or the like, which is hollow inside and normally held flat as shown in FIG. Is embedded and fixed in advance, and its outer periphery is covered with a protective material 8 made of a rubber plate or the like, and is held in the same plane as the skin plate 2.

The seal ring 7 is connected to, for example, a pneumatic pump (not shown) provided inside the skin plate 2. For example, immediately before the shield excavator 1 stops passing through the arrival port 6, the pump is operated. When the protective member 8 is driven, it slightly expands due to the air pressure.
In the state where the shield excavator 1 has stopped reaching the arrival port 6, it expands and expands in diameter as shown in FIG. 2 (b) to protrude from the outer peripheral surface of the skin plate 2, and 5 at the part located at the center of the wall thickness of the shaft 5a and at the part located at the rear end part of the wall, the inner wall surface or the end surface of the arrival port 6 is pressed against the outer peripheral surface of the skin plate 2 and the arrival port. 6 is sealed with the inner peripheral surface. The expansion pressure of the seal ring 7 or the pressing force on the inner peripheral surface of the arrival port 6 sufficiently resists the earth pressure or groundwater pressure from the surrounding ground, the injection pressure of the backfill injection material 9 described later, and the like. It is set to a pressure and prevents the inflow of groundwater or earth and sand that is going to enter the shaft 5 from the outer periphery of the skin plate 2.

In this embodiment, in addition to the water stopping effect due to the expansion of the seal ring 7, the outer peripheral surface of the skin plate 2 and the arrival port 6 are, for example, from inside the shield excavator 1.
Mortar or the like between the outer peripheral surface of the skin plate 2 and the improved ground E1 generated as, for example, an excavated portion during the cutting of the improved ground E1 by the shield excavator 1. By injecting and solidifying the backfill injection material 9, a more reliable water stopping effect can be obtained. This injection operation is performed in a state where the water blocking operation has been performed in advance by the seal ring 7, so that the injection material 9 is sufficiently spread while preventing the outflow of the injection material 9, and is quickly and easily performed. be able to.

In this embodiment, the seal ring 7 is used.
Although air is expanded by applying air pressure, the present invention is not limited to such an embodiment, and can be expanded by applying hydraulic pressure or other fluid pressure.

The position and number of the seal groove 2a and the seal ring 7 disposed therein can be appropriately set as required.

[0016]

As described above in detail, in the method for joining a shield excavator and a reaching shaft according to the present invention, the shield excavator is formed at a predetermined position on the outer periphery of the skin plate. A plurality of ring-shaped seal grooves, embedded in the seal grooves, internally hollow, housed in the seal grooves in a normal state, and expanded by applying fluid pressure to the hollow interior to form a skin plate; Since the outer periphery is provided with a seal ring that protrudes in diameter, for example, when the shield excavator stops passing through the arrival port of the arrival shaft, by applying fluid pressure to the inside of the hollow seal ring housed in the seal groove, The seal ring expands and abuts against the inner surface and end surface of the arrival port, and by pressing this, the flow of groundwater from the gap between the arrival port and the outer peripheral surface of the skin plate is easily achieved. The it is possible to easily suppress, added thereto tighten easily perform work you inject injection material, these, the water stopping between the outer peripheral surface of the access openings and the skin plates quickly and reliably It can be carried out.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a connection state between a shield excavator and a reaching shaft according to the present invention.

FIGS. 2 (a) and 2 (b) are partial cross-sectional views showing, in an enlarged manner, a state of water stoppage by the excavator.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shield excavator 2 skin plate 2a seal groove 5 reaching shaft 5a shaft wall 6 reaching port 7 seal ring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/06 301

Claims (2)

(57) [Claims] 1. One or a plurality of ring-shaped seal grooves formed at predetermined positions on the outer periphery of a skin plate, and are internally hollow and normally housed in the seal grooves, being embedded and fixed in the seal grooves. And a shield excavator having a seal ring that expands by applying a fluid pressure to the hollow interior and protrudes to the outer periphery of the skin plate, and a reaching shaft.
At the joint of, the ground around the shaft is subjected to ground improvement in advance,
The excavator goes to the arrival shaft while cutting the improved ground.
At the same time as moving forward,
Immediately before stopping after passing through the reach formed
And expand the seal ring to remove the outer periphery of the skin plate.
And the outer peripheral surface of the skin plate
Inject backfill material into the gap between the
Between the shield excavator and the arrival shaft
Joining method. 2. A skin plate formed at a predetermined position on the outer periphery of the skin plate.
One or more ring-shaped seal grooves, and the seal grooves
It is buried and fixed inside.
And a fluid pressure is applied to the hollow interior.
Expands and protrudes to the outer periphery of the skin plate
Excavator with a sealing ring
At the junction of The ground around the shaft shaft is subjected to ground improvement in advance, and the seal
The excavator goes to the arrival shaft while cutting the improved ground.
At the same time as moving forward,
Immediately before stopping after passing through the reach formed
And expand the seal ring to remove the outer periphery of the skin plate.
With the shield excavator
Skin play generated as an overhang during cutting of improved ground
Fill the gap between the outer peripheral surface of the
Shield excavator and arrival shaft characterized by solidification
And joining method.