JP4260607B2 - How to start a pipe propulsion machine - Google Patents

Description

  The present invention relates to a method for starting a pipe propulsion device.

  Conventionally, when excavating an excavator etc. from the inside of an underground structure installed in a natural ground to an external natural ground, or when exchanging the cutter bit of a shield machine in the natural ground from inside the chamber, Preventing the inflow of groundwater and earth and sand from the ground into the underground structure and shield machine by applying ground improvement to the ground on the back of the member to be penetrated and the face of the face plate where the cutter bit is installed. Yes.

  In addition, when replacing the cutter machine's cutter bit, the shield machine face plate is provided with a through hole in advance, a slide gate is provided on the opposite side of the through hole, and the slide hole is used to open and close the shield hole. There is a method of projecting a cutter bit from the inside of the machine to an external ground (see, for example, Patent Document 1).

JP 2003-253988 A

  However, according to the conventional method, depending on the condition of the natural ground and the starting direction, the excavator or the like cannot be easily started from the underground structure to the natural ground.

  The present invention has been made in view of such problems, and the object of the present invention is to perform ground improvement or the like on the natural ground even when the natural ground on the back of the member is loose or contains groundwater. An object of the present invention is to provide a method of starting a pipe propulsion device that can easily start the pipe propulsion device.

In order to achieve the above-described object, the present invention includes a step (a) of installing a base having an opening / closing means on a member whose back is a natural ground, and opening the opening / closing means and inserting an excavator into the base. A step (b) of cutting the member using the excavator, a portion cut by the excavator while the excavator is pulled back from the base, and a filler filled in the base; Step (c) of closing the opening / closing means after the tip end has passed the position of the opening / closing means, and opening / closing the opening / closing means, and cutting the filler with a cutter provided at the end. And a step (d) of propelling from the base into the natural ground, and a starting method for the pipe propulsion device.

  In the step (a), the base is fixed to the surface of the member or the surface of another member integrated with the member. The base has, for example, a mortar filling port at a position between the end facing the member and the opening / closing means. In the step (c), a filler is filled into the die through the mortar filling port.

  It is desirable that the base has water stop means in the vicinity of the end portion on the side not facing the member. In steps (a) to (c), a water stop device for an excavator is provided on the base as the water stop means. In step (d), an entrance for a pipe propulsion device is provided in the base.

  The method of starting a pipe propulsion device according to the present invention can easily start a pipe propulsion device without performing ground improvement or the like on the ground even when the ground behind the member is loose or contains groundwater. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view in the axial direction of the tunnel 3, and FIG. 2 is a sectional view in the vicinity of the segment 7 of the tunnel 3. FIG. 2 is an enlarged view of a portion indicated by A in FIG.

  As shown in FIG. 1, an existing tunnel 3 exists in the natural ground 1. The segment 7 lining the tunnel 3 is made of steel or the like. In the present embodiment, the pipe propulsion device 29 (FIG. 5) is propelled from the tunnel 3 shown in FIG. 1, and the steel pipe 41 (FIG. 8) connecting the tunnel 3 and the vicinity of the ground surface 6 is installed at the steel pipe installation position 5. Will be described.

  When propelling the pipe propulsion device 29 (FIG. 5) from the tunnel 3, first, as shown in FIG. 2, the cover plate 11 is attached to the vertical rib (not shown) of the segment 7 of the tunnel 3 as necessary. Weld. The cover plate 11 is a steel plate or the like. Further, the mortar 13 is filled between the skin plate 9 and the cover plate 11 of the segment 7. The cover plate 11 and the mortar 13 are reinforcing members for controlling the postures of the core removal 23 and the pipe propulsion device 29.

  Then, the base 15 is welded to the cover plate 11. The base 15 is a cylindrical member made of steel or the like, and has a gate 17. The gate 17 is an opening / closing means for opening / closing an axial passage of the base 15. The base 15 has a mortar filling port 19 between the end on the cover plate 11 side and the gate 17. The mortar filling port 19 is an injection port for filling the mortar 25 (FIG. 4) in the base 15.

  The base 15 further has a water stop device 21 at an end portion on the side not welded to the cover plate 11. The water stop device 21 is a water stop unit that stops water while withstanding the rotation of the core remover 23 when using the core remover 23. For example, a tube seal or a wire brush is used.

  After welding the base 15 to the cover plate 11, the gate 17 is moved as shown by an arrow B in FIG. 2 to open the axial passage of the base 15. Then, as shown by an arrow C in FIG. 2, the core remover 23 is inserted into the base 15. The core remover 23 is an excavator having a diamond cutter (not shown) at the tip 24.

  FIG. 3 shows a cross-sectional view of the vicinity of the segment 7 after the skin plate 9 is cut. After inserting the core punch 23 into the base 15, as shown in FIG. 3, the cover plate 11, the mortar 13 and the skin plate 9 are cut using the core punch 23.

  FIG. 4 shows a cross-sectional view of the vicinity of the segment 7 after filling with the mortar 25. After the skin plate 9 is cut, as shown by an arrow D in FIG. 3, the core cutter 23 is pulled back from the die 15 into the tunnel 3, and the portion cut by the core die 23 and the die are cut as shown in FIG. 4. 15 is filled with a mortar 25 through a mortar filling port 19. The mortar 25 prevents groundwater, earth and sand, etc. from flowing into the tunnel 3 from the natural ground 1. When the core punch 23 is pulled out, after the end portion 24 has passed the position of the gate 17, the gate 17 is moved as shown by an arrow E in FIG. 3, and the axial passage of the base 15 as shown in FIG. Is closed to prevent the mortar 25 from flowing into the tunnel 3.

  FIG. 5 is a cross-sectional view of the vicinity of the segment 7 when the pipe propulsion device 29 is installed. After pulling out the core remover 23 from the base 15, as shown in FIG. 5, the water stop device 21 that was the water stop means for the core remover 23 is removed from the base 15, and the water stop means for the pipe propulsion device 29. The entrance 27 is attached to the base 15. The entrance 27 is a water stop means for stopping water when the tube propulsion device 29 is propelled, and is, for example, a tube seal or a wire brush.

  After the entrance 27 is attached to the base 15, a pipe propulsion device 29 is installed at the entrance 27. The pipe propulsion device 29 includes a cylindrical tip conduit 33, a cutter disk 31 provided at the tip of the tip conduit 33, a screw conveyor 35 provided inside the tip conduit 33, a bent jack 37, a pinch valve 39, and the like. .

  After installing the pipe propulsion device 29 at the entrance 27, the gate 17 is moved to open the axial passage of the base 15 as shown by the arrow F in FIG. Then, the pipe propulsion device 29 is propelled in the direction of the mortar 25 as indicated by an arrow G in FIG.

  6 and 7 are cross-sectional views of the vicinity of the segment 7 when the pipe propulsion device 29 is propelled. As shown in FIG. 6, a steel pipe 41 is connected to the rear end portion of the pipe propulsion device 29. The pipe propulsion device 29 cuts the mortar 25 filled in the base 15 and the segment 7 with the cutter disk 31 and propels the excavated earth and the like while feeding them backward with the screw conveyor 35.

  As shown in FIG. 6, after the cutter disk 31 reaches the natural ground 1, the pipe propulsion device 29 further excites the natural ground 1 with the cutter disk 31 as indicated by an arrow H. As the pipe propulsion device 29 is propelled into the natural ground 1, the steel pipe 41 is added in the tunnel 3 as shown in FIG. 7.

  8 shows a sectional view in the axial direction of the tunnel 3 after the installation of the steel pipe 41, and FIG. 9 shows a sectional view around the segment 7 after the installation of the steel pipe 41. FIG. 9 is an enlarged view of a portion indicated by I in FIG.

  After installing the steel pipe 41 as shown in FIG. 8 over the entire length of the steel pipe installation planned position 5 shown in FIG. 1, the pipe propulsion device 29 is recovered on the ground surface 6 side or in the tunnel 3. And the mortar 45 grade | etc., Is installed in the inside of the steel pipe 41 as needed. Moreover, as shown in FIG. 9, the part which protruded in the tunnel 3 of the steel pipe 41, and the nozzle | cap | die 15 are removed, the cover 43 is fixed to the cover plate 11, and installation of the steel pipe 41 is complete | finished.

  As described above, in this embodiment, the base 15 with the gate 17 is welded to the segment 7 of the tunnel 3, and the mortar 25 and the natural ground 1 in the pipe propulsion device 29 are cut when the skin plate 9 is cut by the core removal 23. Other than during excavation, the gate 17 is used to close the axial passage of the base 15. Further, after the skin plate 9 is cut in the core direction 23, the mortar 25 is filled in the cut portion. As a result, even if the natural ground 1 on the back of the segment 7 is loose or the natural ground 1 contains groundwater, the earth and sand will not flow into the tunnel 3, so that the pipe is not improved without the ground improvement of the natural ground 1. The propulsion device 29 can be started in the natural ground 1.

  As mentioned above, although preferred embodiment of the start method of the pipe propulsion apparatus concerning this invention was described referring an accompanying drawing, this invention is not limited to this example. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, in the present embodiment, the case where the pipe propulsion device 29 is started from the segment 7 has been described, but the case where the pipe propulsion device is started from a member (such as a steel wall) other than the segment whose back is a natural ground. A similar method can also be used. Further, the starting direction of the pipe propulsion device may not be vertically upward as shown in FIG. Furthermore, in the present embodiment, the segment 7 is reinforced with the cover plate 11 and the mortar 13, but when the posture of the core removal 23 and the pipe propulsion device 29 can be controlled without reinforcement, the back surface of the segment or the like is a natural ground. The base may be directly fixed to a certain member.

Cross section of tunnel 3 in the axial direction Sectional view near segment 7 of tunnel 3 Sectional view around segment 7 after skin plate 9 is cut Sectional view around segment 7 after filling with mortar 25 Sectional view around segment 7 when tube propulsion unit 29 is installed Sectional view around segment 7 when tube propulsion unit 29 is propelled Sectional view around segment 7 when tube propulsion unit 29 is propelled Cross-sectional view of tunnel 3 after installation of steel pipe 41 Sectional view around segment 7 after installation of steel pipe 41

Explanation of symbols

1 ……… Machiyama 3 ……… Tunnel 5 ……… Steel pipe installation location 7 ……… Segment 15 ……… Base 17 ……… Gate 19 ……… Mortar filling port 21 ……… Water stop device 23… …… Uncored 25 ………… Mortar 27 ………… Entrance 29 ……… Tube propulsion machine 41 ……… Steel pipe

Claims (6)

A step (a) of installing a base having an opening and closing means on a member whose back is a natural ground; and
A step (b) of opening the opening and closing means, inserting an excavator into the base, and cutting the member using the excavator;
The portion cut by the excavator and the base are filled with the filler while the excavator is pulled back from the base, and the opening / closing means is closed after the tip of the excavator passes the position of the opening / closing means. Step (c) to perform,
Opening the opening / closing means, and cutting the filler with a cutter provided at an end of the tube propulsion device to propel it from the base into the ground (d);
A starting method for a pipe propulsion device, comprising:   The method of starting a pipe propulsion device according to claim 1, wherein in the step (a), the base is fixed to a surface of the member or a surface of another member integrated with the member. The base has a mortar filling port at a position between an end facing the member and the opening / closing means, and is a portion cut by the excavator through the mortar filling port in the step (c). 2. The method of starting a pipe propulsion device according to claim 1, wherein the filler is filled in the base.   The method of starting a pipe propulsion device according to claim 1, wherein the base has a water stop means in the vicinity of the end portion on the side not facing the member.   The method of starting a pipe propulsion device according to claim 4, wherein, as the water stop means, a water stop device for the excavator is provided in the base in the steps (a) to (c).   5. The method of starting a pipe propulsion unit according to claim 4, wherein, in the step (d), an entrance for the pipe propulsion unit is provided in the base as the water stop means.

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