JPH0220303Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for preventing the receding of a pipe during the early stage of propulsion in a propulsion method in which the pipe is buried by pushing it from a shaft while excavating with a shield machine. .

The propulsion method for constructing tunnels using a shield machine is to sequentially add Huyum pipes to the shield machine as a trailing pipe, and then propel the trailing end with a propulsion device in the shaft. It propels the body forward. In this construction method, in the early stage of propulsion, when the frictional resistance between the shield machine and the surrounding surface of the subsequent pipe and the ground is small relative to the earth pressure at the face of the shield machine, the shaft propulsion device is used to propel the Huyum pipe. rear,
When the propulsion device is retracted when adding the next hume pipe, the existing hume pipe also retreats due to the face and earth pressure. This loosens the ground at the face and causes ground subsidence. In order to prevent this, conventionally, as shown in Fig. 6, an anchor metal fitting e buried in the wellhead ring d is used by using the mounting bolt hole c of the connecting tool b provided in the hume pipe a to connect the hume pipes. A wire f or the like was stretched between the two and fixed.

However, once the bolt hole c was provided in the humid pipe a, even if it was later filled with mortar or the like, it was not sufficient, and underground water leaked into the pipe. For this reason, recently, the fume tube a has been connected by embedding an embedding nut inside the hume tube and attaching the connector b, making it impossible to prevent the above-mentioned retreat.

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a retreat prevention device for a propulsion tube body that can prevent the Hume tube from retreating even under the above circumstances.

In order to achieve the above object, the present invention connects a band-shaped ring, which has a diameter larger than the outside diameter of the buried pipe body and has a tapered part that widens toward the front of the propulsion, to an immovable object such as a pit ring or an earth retaining wall. , a wedge is inserted between the tubular body and the tapered portion of the band-shaped ring.

Next, embodiments of the present invention will be explained with reference to the drawings. In the figure, numeral 1 is the ground, 2 is a shaft, and this shaft 2 is surrounded by an earth retaining wall 3. Furthermore, a bottom floor 4 is poured into the shaft 2, and a tunnel opening ring 6 is provided in close contact with the retaining wall 3 at the tunnel opening position 5. Reference numeral 7 denotes a pipe body such as a hump pipe for lining the tunnel, and this pipe body 7 prevents underground water from leaking by a water-stop pankin 8 provided on the shaft side of the tunnel entrance ring 6. A plurality of anchors 9 are buried at appropriate locations apart from the pipe body 7 of the wellhead ring 6. Reference numeral 10 denotes a belt-like plate ring having a diameter slightly larger than the outer diameter of the pipe body 7.The diameter of both ends of the ring 10 is larger at one end. (not shown) side.
Reference numeral 11 denotes a wedge, and the wedge 11 is placed between the outer circumferential surface of the tube body 7 and the inner circumferential surface of the ring 10 at appropriate intervals, and is inserted and fitted with its apex side facing the tunnel hole ring 6. It has been done. Further, a hook 12 is fixedly attached to a suitable position on the outer peripheral surface of the ring 10, and a wire 13 is stretched between the hook 12 and the anchor 9, and is tensioned by a lever block 14.

With the above configuration, the newly installed pipe body 7b is connected to the rear end of the existing pipe body 7a, which is propelled by the shield machine, within the shaft 2, using the connector 15 or the like. At this time, the ring 10 is fitted onto the tube body 7b in advance, and the shield machine and the tube body 7 are propelled by the tube body 7b by a propulsion device (not shown) in the shaft 2. When this propulsion is finished, the propulsion device is moved backward in order to connect the next tube 7c, but at the beginning of propulsion, the earth pressure acting on the front of the shield machine acts on the outer peripheral surface of the shield machine and the existing tube 7a. Since the frictional force is greater than the frictional force with the surrounding ground, as the propulsion device retreats, the shield machine and existing pipe 7
a and 7b move backward. This may cause the ground in front of the shield aircraft to sink.

Therefore, before reversing the propulsion device, a ring 10 is arranged at the rear of the tube body 7b facing into the shaft 2, and a wedge 1 is placed between the ring 10 and the outer peripheral surface of the tube body 7b.
1 from the shield machine side and clamp it. Next, a wire 13 is stretched between the hook 12 on the outer peripheral surface of the ring 10 and the anchor 9 embedded and fixed in the wellhead ring 6, and tensioned by the lever block 14. The ring 10 is fixed to the tube body 7b by the wedge 11, and is further tensioned and connected to the wellhead ring 6 by the wire 13, thereby preventing the tube body 7 from retreating. Further, the force that causes the tubular body 7b to retreat acts to cause the wedge 11 to retreat due to the friction between the tubular body 7 and the wedge 11, but since the ring 10 is tapered, the wedge 11 is The contact with the body 7b becomes even stronger and narrower. After preventing the tube body 7b from retreating in this way, the propulsion device is retreated,
A new tube 7c is inserted between the tube 7b and the propulsion device, connected to the tube 7b, and pressed by the propulsion device.
After that, when the tube body 7b moves forward a little, the wire 13
will loosen, so at this time wedge 11, wire 13,
The lever block 14 is removed and the ring 10 is left in place to continue propulsion. This is repeated to perform the propulsion method.

In addition, the rings of the band-shaped plate are not limited to those mentioned above.
The ones shown in FIGS. 4 and 5 may also be used. That is, the belt-shaped plate 30 is formed into a cylindrical shape, and U-shaped notches 31 are provided from one end side at appropriate intervals on the circumference, and triangular plates 32 are placed on two opposite sides of the notches 31 so as to face the outside of the ring. A cover plate 33 is attached between the bottom side of the U-shaped notch 31 and one side of each of the triangular plates 32, 32, forming a taper with respect to the ring surface. A wedge 1 is placed in the space formed by this tapered part.
1 may be inserted. Further, by providing reinforcing ribs or by dividing the ring 10 and providing flanges 35 on the divided sides and connecting them with bolts 36, attachment to and removal from the tube body 7 can be made easier.

As described above, the propulsion pipe retreat prevention device of the present invention has a belt-shaped ring fitted on the shaft side of the burial pipe inserted into the wellhead ring, and a tapered part of the belt-like ring that has a larger diameter on the wellhead ring side. A wedge is inserted between the tapered part and the pipe body, and the band ring is connected to an immovable object such as a wellhead ring, so it is easy to insert the wedge, and the contact surface with the pipe body is This makes it possible to effectively transmit the receding force of the tube body to the ring without damaging the tube body, and to reliably prevent the existing pipe from retreating. It is possible to provide a high-quality tunnel without the need for through-holes and without causing water leakage when the tunnel is used.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a partially omitted side view, Figure 2 being a longitudinal sectional front view of that part, and Figure 3 being a side view of that part. figure,
FIG. 4 is a front view showing another example of the band-shaped ring, and FIG.
The figure is a side view thereof, and FIG. 6 is a partially omitted side view showing a conventional example. 2... Vertical shaft, 6... Wellhead ring, 7... Pipe body,
10... Band-shaped ring, 11... Wedge.

Claims (1)

[Scope of utility model registration request] A strip ring is fitted to the vertical shaft side of the buried pipe body inserted into the wellhead ring, a tapered part is provided on the belt-like ring with a larger diameter on the wellhead ring side, and a wedge is inserted between the tapered part and the pipe body. 1. A propulsion tube retreat prevention device, characterized in that a belt-like ring is inserted into the shaft and an immovable object such as a wellhead ring is connected to the belt-shaped ring.