JPS6126465Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a Metsusel excavator that excavates a tunnel directly under a pipe roof while preventing the upper earth pressure from collapsing.

The tunnel excavation method that combines a pipe roof and a Metsucell excavator involves press-fitting multiple pipes in parallel in advance into the ground directly above the crown in the planned tunnel extension direction over an area wider than the tunnel width. , the ground immediately below is excavated by a Metsucel excavator that allows Metsucel sheet piles to be moved back and forth only on both sides.

This Metsusel excavator, as shown in Figure 8,
A shoring frame a that is arranged at appropriate intervals in the longitudinal direction and is an integral framework, a plurality of Metsucel sheet piles b that are attached to both outer surfaces of the shoring frame a so as to be able to move back and forth independently of each other, and a shoring frame. It consists of a shoe c that is integrally provided at the bottom of a frame a and slides on the bottom surface of the tunnel excavation, and supports the side earth pressure by the Metsu cell sheet pile b via the supporting frame a.

On the other hand, the earth pressure in the upper part of the Metsusel excavator is supported by the pipe roof d, which is press-fitted in advance, but this pipe roof d is mainly applied to the ground in front of the excavation surface face and the tunnel behind the Metsusel excavator. Since it is supported by the shoring e, the length of the Metzel excavator will bend downward due to earth pressure. For this reason, there was a problem in that the upper ground subsided, and especially when a tunnel was excavated directly under the rails, the subsidence due to the train load adversely affected the safety of train operation.

In order to solve these problems, this invention
To provide a Metsusel excavator constructed such that a pipe roof can always be supported even in the parts of the Metsusel excavator.

The embodiments of the present invention will be explained with reference to the drawings: 1
is the ground, and 2 is the tunnel. 3 is a pipe roof consisting of a group of pipes that were press-fitted into the upper part of the tunnel where the tunnel was to be excavated before tunnel 2 was excavated;
It is formed by press-fitting a plurality of pipes parallel to the length direction of the tunnel, and its width is made wider than the width of the tunnel by an appropriate dimension.

4 is a Metsusel excavator with multiple supporting frames 5, 6,
7 and 8 are arranged at appropriate intervals in the longitudinal direction, and these supporting frames are integrally framed by a connecting rod 9 suspended horizontally between them. Long pot made sheet piles 10, 10-
--10 are attached so that their long side end faces are adjacent to each other so that they can be moved independently in the front and back direction, and further, the front ends are mounted on both sides between the outer bottom surfaces of the front and rear support frames 5 and 8 from the bottom surface upward. The shoes 11, 11, which are inclined 11a, are integrally fixed to the supporting frame, and these shoes and the sheet pile 10 are brought into pressure contact with the tunnel bottom and both side wall surfaces, and each sheet pile 10 is attached to the tunnel face as the tunnel face is excavated. It is composed of a propulsion member 12 and a press-fitting member 13 that are press-fitted into both side surfaces of the propeller.

In addition, in order to regulate the mutual movement direction of the shoring frames 5 to 8 and the sheet piles 10, as is known, guide plates 14 (seventh
(see figure) is planted, and the guide plate 14 is fitted into the gap 15 formed between adjacent sheet piles.

Moreover, the aforementioned propulsion member 12 and press-fitting member 13
are formed into a frame shape along the inner surface of the sheet pile group, and are arranged so as to be freely movable in the front and rear directions.

Reference numeral 16 denotes both vertical frame portions 6a, 6 of the front intermediate supporting frame 6.
A push-up jack 17 is fixed by a bracket fixed to the inner surface facing the upper part of the support frame 6, and a push-up frame 18 corresponding to the upper girder of the supporting frame 6 is horizontally mounted between the upper ends of the rods of these jacks 17, 17. The push-up frame 18 is moved upward by the operation of the jack 17, and the lower surface of the pipe roof 3 is moved approximately midway between the tunnel supporting frame 40 at the rear end of the Metzel excavator 4 and the ground 41 in front of the face. It is made to press against the

Reference numeral 19 denotes a bearing plate disposed on the bottom of the tunnel between the shoes 11, 11, and supporting members 20, 20 are erected and fixed on both sides of the upper surface of the bearing plate, and these supporting members 2
A beam 22 is horizontally suspended and fixed parallel to the lifting frame 18 between the upper ends of rods of jacks 21, 21 which are integrally provided at the upper end of the pipe. It is pressed against the lower surface of the roof 3 to support the load placed on the pipe roof 3.

Note that this beam 22 is provided between the push-up frame 18 and the rear intermediate support frame 7.

Reference numeral 23 indicates a plurality of propulsion jacks that connect the inner surface of the vertical frame portion of the rear intermediate support frame 7 and the propulsion member 12, and reference numeral 24 indicates a plurality of propulsion jacks that connect the press-fit member 13 and the inner surface of the vertical frame portion of the rear support frame 8. It is a press-fit jack.

Reference numeral 25 denotes locking holes drilled in each sheet pile 10 at regular intervals in the length direction, and through holes 26 are drilled in the propulsion member 12 and press-fitting member 13 corresponding to the locking holes 25. A fixing member 27 such as a pin is removably inserted between the through hole 26 and the locking hole 25 to integrally fix the sheet pile 10 to the propulsion member 12 and the press-fit member 13.

To describe the operation of the embodiment configured as above, first, the pipe roof 3 is press-fitted into the upper part of the tunnel where the tunnel is to be excavated in the extending direction of the tunnel, and then the pipe roof 3 is moved by the mobile Metsucel excavator 4. Excavate the lower ground.

Figure 1 shows the stage where Metsucel sheet piles 10 are being press-fitted after excavating the face and discharging the earth and sand.
Each sheet pile 10 is integrally fixed to the propulsion member 12 and the press-fitting member 13 by inserting a fixture 27 between the through hole 26 and the locking hole 25.

In addition, the jack 1 attached to the front intermediate support frame 6
7 and 17 are actuated to press the push-up frame 18 against the lower surface of the pipe roof 3 to support the upper load applied to the pipe roof 3.

From this state, the fixing device 27 to which several sheet piles 10 to be moved are fixed is removed from the propulsion member 12, and conversely, these selected several sheet piles are fixed on the press-fitting member 13 side. All the other sheet pile fixtures 27 are removed except for the fixture 27.

Thereafter, when the press-fitting jack 24 is operated with the propulsion jack 23 stopped, the propulsion member 12 held by the frictional force of the sheet pile 10 against the tunnel wall surface and the framed supporting frames 5 to 8 are used as propulsion base points. , the press-fitting member 13 is propelled to the front of the face together with several sheet piles 10 fixed thereto, and the tips of these sheet piles 10 are press-fitted into the face.

When the sheet pile 10 is press-fitted to a certain width (usually 20 to 50 cm), the press-fitting jack 24 is stopped, and the fixture 27 that fixes the sheet pile 10 is removed to free the press-fitting member 13, and then the press-fitting jack 24 is stopped. The reverse operation is performed, and only the press-fitting member 13 is retreated to its original position, leaving the sheet pile 10 press-fitted in the face in place.

Next, perform the same operation as described above to press-fit several sheet piles 10 into the face, repeat this press-fitting operation, and when approximately half of all the sheet piles have been press-fitted, the propulsion member 12 After all the fixing devices 27 are removed from the sheet pile 10 to make it free, the propulsion jack 23 is operated while the press-fitting jack 24 is stopped, thereby propelling the sheet pile 10 in which the propulsion member 12 has already been press-fitted. The propulsion member 12 is fixed to these sheet piles 10 by aligning it with the fixing and locking holes 25 and inserting the fixing tool 27.

Thereafter, as described above, the required number of remaining sheet piles that have not yet been press-fitted are fixed to the press-fitting member 13, and the press-fitting operation of these sheet piles is repeated to complete the press-fitting of all the sheet piles.

In this way, when all the sheet piles 10 are advanced by a certain length and press-fitted, the support member 20 is moved forward along the tunnel bottom surface to the vicinity of the front intermediate supporting frame 6 by an appropriate means such as a jack, and the support member 20 is moved forward by a suitable means such as a jack.
1 to extend the supporting member 20 between the bearing plate 19 and the beam 22, and as shown in FIG. 6, the pipe roof 3 is supported by the beam 22 using the tunnel bottom as a reaction force, and then The jacks 17, 17 provided on the intermediate support frame 6 are reversely operated to lower the push-up frame 18 as shown in FIG.

Next, after all the sheet piles 10 are fixed to the propulsion member 12 with the fixing devices 27, the propulsion jack 2
3 is extended, the earth pressure exerted on the sheet pile 10 is used as a reaction force to move the framed supporting frames 5 to 8 forward by the stroke of the jack.

When the advance of the support frame is finished, the jacks 17, 17 are operated to raise the push-up frame 18, and the push-up frame 18 presses the lower surface of the pipe roof 3.
To support.

By repeating such operations, the tunnel is excavated while the pipe roof 3 is always supported by either the push-up frame 18 or the beam 22, and the Metzel excavator 4 is allowed to run on its own.

In the above embodiments, the case where a tunnel with a rectangular cross section is excavated was described, but the supporting frame, propulsion member, press-fit member, push-up frame, beam, etc. may be suitable for excavating a tunnel with a circular or elliptical cross section. It is also possible to excavate a tunnel with a cross section other than a rectangular one by configuring the pipe roof in a shape and press-fitting the pipe roof in advance in a state corresponding to the shape.

In addition, although the beam 22 is supported by the pillar-shaped support member 20, in short, it is sufficient that the beam is located between the tunnel excavation bottom surface and the beam and has an expansion and contraction mechanism. Although a case has been described in which one set of the above is provided, it goes without saying that a plurality of sets may be provided.

As described above, the present invention integrally frames supports arranged at appropriate intervals in the longitudinal direction, and a plurality of supports that are adjacent to each other on both outer surfaces of the framed supports and press against the tunnel wall surface. In the Metsusel excavation machine, independent sheet piles are arranged so that they can freely slide forward and backward, and these sheet piles are press-fitted around the face of the tunnel while excavating a tunnel directly under the pipe roof that has been press-fitted in advance into the upper part of the tunnel to be excavated. A push-up frame that is supported by the support frame and moves up and down, and a beam that is supported by the bottom surface of the tunnel and moves up and down are provided, and the push-up frame and beam are supported in contact with the lower surface of the pipe roof. Since this relates to the Metsusel excavator, the pipe roof is supported by a push-up frame when sheet piles are pressed in, and the pipe roof is supported by a beam when the Metsusel excavator moves forward. As a result, the pipe roof can be supported at all times during tunnel excavation, which shortens the unsupported part of the pipe roof, prevents bending of the pipe roof due to overload, and eliminates ground deformation. In particular, tunnel excavation can be carried out when there is an overload load such as a train load without adversely affecting the running of the train. Furthermore, since the unsupported portion of the pipe roof is shortened in this way, it is possible to use a pipe roof with low strength.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a simplified vertical side view, FIGS. 2 and 3 are simplified vertical front views taken along line A-A and B-B in FIG. Figure 4 is a simplified longitudinal cross-sectional side view during propulsion of the shoring frame, and Figures 5 and 6 are lines C-C and D in Figure 4, respectively.
7 is a sectional view of a main part showing a sheet pile fixing means, and FIG. 8 is a simplified longitudinal sectional side view of a conventional Metsucel excavator. 1... Ground, 2... Tunnel, 3... Pipe roof, 4... Metsusel excavator, 5-8... Shoring frame, 10... Sheet pile, 11... Shoe, 12... Propulsion member, 13... Press-fitting member, 17... Push-up jack, 18... Push-up frame, 19... Bearing plate, 20...
...supporting member, 21...jacket, 22...beam, 23...propulsion jack, 24...press-fitting jack.

Claims (1)

[Scope of utility model registration request] Shoring frames arranged at appropriate intervals in the longitudinal direction are integrally framed, and a plurality of independent sheet piles are adjacent to each other and pressed against the tunnel wall surface on both outer surfaces of the framed shoring frame, and are slidable back and forth. In the Metsusel excavating machine, which excavates a tunnel directly under the pipe roof that has been press-fitted in advance into the upper part of the tunnel to be excavated, while press-fitting these sheet piles around the face of the tunnel, the top and bottom are supported by the supporting frame. Metsu cell excavation characterized in that a movable push-up frame and a beam supported by the bottom surface of the tunnel and moved up and down are provided, and these push-up frames and beams are configured to abut and support the lower surface of the pipe roof. Machine.