JP3435438B2 - Magnifying shield device and construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded shield device suitable for expanding and replacing an old reinforced concrete pipe that has been deteriorated with a new pipe.

[0002]

2. Description of the Related Art Conventionally, when repairing an existing pipe that has deteriorated or has failed in sewerage, that is, when replacing it with a new pipe, earth retaining piles (sheet piles) are used from the ground. It is known that the excavation method is used to remove and construct new construction. However, as is known, the open-cut method is a road condition,
Aggravates the surrounding environment. Therefore, as a method of minimizing the impact on the ground environment, a shield machine with a cross section that is slightly larger than the existing pipe is propelled so as to surround the circumference of the existing pipe, and the existing pipe is dismantled and removed while the new pipe is being removed. A shield construction method for expanding and replacing is proposed. For example, in Japanese Examined Patent Publication No. 4-19358, a segment of an existing tunnel is cut by an excavating blade of a shield excavator, and at the same time, a tunnel having a diameter larger than that of the existing tunnel is excavated, and a cutter body of the shield excavator, We are developing an enlarged shield method in which a cutting blade for cutting a segment of an existing tunnel and an excavating blade for excavating a tunnel having a diameter larger than that of the existing tunnel are installed in parallel. In addition, JP-A 1-290
In the Japanese Patent No. 894 publication, in the replacement construction method of the existing underdrain,
A support device having a cutter for cutting rebar and a cutter bit, disk cutter, and gauge cutter on the cutter face of the excavator to make the cutter bit excavate earth and sand, and the disk cutter and gauge cutter to crush steel and concrete. An example in which the above is performed is shown.
In such a shield construction method, a method is used in which the cutter disc mounted on the front surface of the shield machine is dismantled by crushing the body of the existing pipe by rotating the cutter disc.

[0003]

However, such a method using a cutter disk has a disadvantage that only hard things such as concrete, stone, porcelain pipes and bricks can be crushed. That is, in the case where the skeleton of the existing pipe is reinforced concrete, when the disk cutter is applied while rotating here, the rebar inside the skeleton bends through its toughness, and the inside (shield axis side) or outside It is hard to be cut because it is deflected to the (ground side). Then, when the reinforcing bar is deflected inward, there is a risk that it will be caught in the rotating mechanism or the like through the gap of the shield machine and interfere with the propulsion operation of the shield machine. Entangled between the outer shell and the ground. Then, the cutting of the reinforcing bar that has once deviated inward or outward is very complicated. Therefore, in such a shield machine for expanding and replacing existing pipes, how to cut the reinforcing bars was a big problem to be solved. Therefore, in view of the above circumstances, the present invention provides an enlarged shield device capable of dismantling and removing an existing pipe while reliably crushing a reinforcing bar.

[0004]

That is, the present invention has a shell body (9) which can be propelled in the ground (2), and a cutter head (10) is provided on the front side of the shell body (9) in the propelling direction. , The excavation surface (10g) of the cutter head (10) provided so as to be rotatable around the shield axis (CL1)
Is formed so as to be recessed from the outer peripheral side of the excavated surface (10 g) toward the central portion, and the bit (1
1) A plurality of crushing cores (23) are attached inside the shell body.
The temporary pipe placed inside the existing pipe inside the crushing core.
Protruding in the center of the cutter head so that it can be inserted into the
And a crushing core (23) provided between the cutter head (10) and the crushing core (23) in a tubular shape, and a reinforcing bar crushing bit (2) is provided around the crushing core (23).
5) is provided so as to face the demolition material transfer void (26). The present invention also relates to the above-mentioned expanded seal.
When removing the existing pipe using a cable device, remove the existing pipe
Inside the tunnel, install a temporary pipe with a flow channel inside.
Temporarily installed side by side in the opposite direction, and rupture the outside of the temporarily installed temporary pipe.
The temporary pipe is surrounded by a crushing core,
Insert it inside and rotate the cutter head in that state
While driving and crushing the existing pipe by the cutter head,
The structure is set so that it is propelled while being guided by the temporary pipe.
Is made. The present invention also provides the above-mentioned expanded shield device.
Inside the existing pipe when dismantling and removing the existing pipe using
In addition, a temporary pipe with a flow passage formed inside the tunnel axial direction
Temporarily installed side by side, and filling material inside the existing pipe outside the temporary pipe.
The crushing core is filled with the outside of the temporarily installed temporary pipe.
Insert the temporary pipe inside the crushing core so that it is more enclosed.
And then drive the cutter head to rotate in that state.
Do not crush the existing pipe and filler with the cutter head.
, So that it will be propelled in the form of being guided by the temporary pipe.
Consists of The numbers in parentheses are for convenience of showing the corresponding elements in the drawings, and therefore,
This description is not limited to the description in the drawings.
The same applies to the following action columns.

[0005]

With the above-described structure, according to the present invention, the cutter head (10) is rotatably driven to disassemble the existing pipe (3) into the plurality of bits (11) by crushing the existing pipe. Body piece (31 ') and rebar (32) of (3)
Etc. are transferred from the outer peripheral side of the excavation surface (10g) toward the center along the excavation surface (10g) of the cutter head (10) and enter the demolition material transfer void (26) to disassemble the demolition material. It acts so as to be crushed by the reinforcing bar crushing bit (25) of the crushing core (23) in the transfer gap (26).

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional side view showing an enlarged laying replacement work of an existing pipe using an embodiment of the enlarged shield device according to the present invention, and FIG. 2 is an enlarged view of the enlarged shield device shown in FIG.
2 is a view of the enlarged shield device shown in FIG. 2 seen from the front side, FIG. 3 is a view taken along the line III, III in FIG. 1, and FIG. 4 is a partially cutaway view of the enlarged shield device shown in FIG. 2 seen from the rear side. , I in Figure 1
V, IV arrow view, FIG. 5 is a partially enlarged side view showing the dismantling situation of an existing pipe using the expansion shield device according to the present invention, and FIG. 6 is a model diagram showing another embodiment of the expansion shield device according to the present invention. Is.

As shown in the left part of FIG. 1, an old pipe 3 which is an existing pipe being dismantled and a new installation being installed as shown in the right part of FIG. Tube 5
It is arranged in such a manner that it is buried in the ground 2 at a position where it has a predetermined soil cover from the ground surface 2a, and inside the old pipe 3 and the new pipe 5, the inside of the pipe 3 from the direction of the arrow A in FIG. The iron pipe 6 in which the sewage flow path FL toward the direction side is formed connects the manhole 2s on the left side and the manhole 2s on the right side in FIG. It is provided here as a temporary pipe. Between the old pipe 3 and the new pipe 5, the old pipe 3 is dismantled and removed to newly install the new pipe 5.
A shield device 7 is provided as an enlarged shield device for constructing the shield device.
From the direction side toward the arrow A direction side, the old pipe 3 is dismantled while the new pipe 5 is constructed so as to follow the shield device 7, and the ground 2 is propelled toward the arrow A direction side in FIG. is doing.

As shown by the chain double-dashed line in FIG.
Concrete body 31 whose cross section is formed in a gate shape
A plurality of reinforcing bars 32 are embedded in the body 31 along the pipe axis direction and the circumferential direction of the aged pipe 3. Further, as shown in FIG. 1, a filler 33 made of mortar or the like is provided inside the aged pipe 3 during the disassembling work, as described above, on the outer periphery of the iron pipe 6 temporarily installed inside the aged pipe 3. It is provided in an annular shape so that the gap between the filling material 33 and the manhole 2s on the left side of FIG. 1 is connected to the bulkhead 35 at the end of the filling material 33. Is provided in the shape of a side lid in a closed form. The aged pipe 3 is being dismantled from the arrow B direction side toward the arrow A direction side by the shield device 7, and the rear end 3
b is in a shape facing the front surface of the shield device 7.

On the other hand, as shown in FIG. 1 or 2, the new pipe 5 is formed in an annular shape having an outer diameter corresponding to the inner diameter of the outer shell 9 of the shield device 7, and the new pipe 5 is, for example, reinforced concrete. , Or segment 51 made of steel, etc.
The segment pieces constituting the segment 51 are jointed in an annular shape with a width L1 of one ring, and the segment pieces are embedded and fixed in the ground 2. That is, in the new pipe 5, the shield device 7 has the old pipe 3
At the same time as the dismantling, the ground 2 around the aged pipe 3 is built and built in the expanded tunnel space 4 formed by expanding and excavating in a cylindrical shape. Therefore, the segment 51 forming the front end 5a of the new pipe 5 is In the outer shell 9 of the shield device 7, one or two rings are inserted and arranged.

As shown in FIG. 1, the shield device 7, which is an enlarged shield device according to the present invention, supplies the mud 40 to the excavation chamber 10c while the undecomposed aged pipe 3 and the face 2b surrounding it. And the filling material 33 in the aged pipe 3 is propelled in a form of excavating, and the excavation scrap 41 generated by the excavation is recovered and discharged in the direction of the arrow B, which is the rear side, and the shield device 7 is shown in FIG. As shown, a predetermined outer diameter D that is larger than the outer diameter of the aged pipe 3 to be disassembled.
It has an outer shell 9 which is a shell body formed into a substantially cylindrical shape in the form of 1. The shield device 7 includes
Rear end 3b on the arrow B side except the part that has been removed and updated
In the vicinity, the outer periphery of the cutter head 10 surrounds the outside of the iron pipe 6, and the iron pipe 6 is penetrated into the inside of the outer shell 9 so that the outer shell 9 is propelled in the ground 2. In addition, as described above, the gap with the outer peripheral surface of the new pipe 5 which is inserted and arranged in the outer shell 9 is sealed by a wire brush type tail seal 91.

On the front side of the outer shell 9 in the direction of propulsion shown in the direction of arrow A, as shown in FIG. 2, the iron tube 6 is surrounded, that is, in the direction of arrows A and B, the center hole is formed. A cutter head 10 formed in an open disc shape and having a diameter larger than that of the aging pipe 3 like the outer shell 9 is fitted to the hydraulic motor 10a connected to the cutter head 10 and the iron pipe 6. The excavation surface 10g is provided so as to be rotatable around the shield axis CL1 via the diameter bearing 10f, and the excavation surface 10g is formed in the front surface portion of the cutter head 10 on the arrow A direction side. It is formed so as to be recessed from the outer peripheral side of 10 g toward the center. The excavated surface 10g is formed by a cutter wheel 10b inclined so as to be depressed like a mortar from the outside to the inside,
The cutter wheel 10b rotates around the iron pipe 6 in a direction intersecting the plane of FIG.
It is rotatable in the directions of arrows C and D). A plurality of bits 11 are attached to the cutter wheel 10b forming the excavation surface 10g, and the plurality of bits 11 are directed from the outer periphery of the cutter wheel 10b toward the center as shown in FIG. Two or three pieces arranged along the E and F directions form a number of rows along the directions of arrows C and D, which are rotation directions, and the two points of the aged pipe 3 to be disassembled by the rotation are shown in FIG. It is arranged and mounted so as to cover the end cross-sectional shape indicated by the chain line. Also, the cutter wheel 10b
As shown in FIG. 2, a guide portion 10d is formed such that the innermost portion thereof folds slightly toward the rear side (arrow B side) along the outer circumference of the iron pipe 6. Saw blades 101 are arranged on 10d as a reinforcing bar crushing bit in a form of being arranged substantially along the directions of arrows A and B in FIG. 2 and in a direction intersecting the plane of FIG.

An excavation chamber 10c is formed in the cutter head 10 in such a manner that the iron pipe 6 is inserted in the center of the excavation chamber 10c and disposed around the iron pipe 6. The earth and sand seal 12 is provided so as to be arranged on the rear side so as to seal the inside and outside of the excavation chamber 10c. As shown in FIG.
As shown in FIG. 1, the mud pipe 13 for feeding the mud 40 to the excavation chamber 10c is the manhole 2s on the right side of FIG.
It is provided in the form of extension connection to the position, and the mud pipe 1
3, a discharge port 13a is provided so as to open at the upper part of the excavation chamber 10c. In addition, the shield device 7 has a mud pipe 15 for discharging the excavation scrap 41 taken into the excavation chamber 10c through the guide portion 10d of the cutter head 10 to the rear side of the shield device 7.
1 is extended and connected to the manhole 2s position shown on the right side of FIG.
5a is provided so as to open at the bottom of the excavation chamber 10c. In addition, a crusher 16 is provided in the pipe line of the sludge pipe 15, and concrete trash, that is, the skeleton piece 3 in the excavation sludge 41 taken from the intake port 15 a of the mud pipe 15.
1'and the rebar 32 are finely crushed so that the inside of the sludge discharge pipe 15 can be pressure-fed. That is, the excavation slot 41 at this time means that the ground 2 is excavated and the rebar 32 is It is formed by cutting the skeleton body 31 and the filling material 33 with which the inside is filled.

On the rear side of the girder portion 92 in the outer shell 9 in the direction of arrow B, as shown in FIG. 2 or 4, each segment piece for forming the segment 51 of the new pipe 5 is provided. The built-in erector 17 is provided, and as shown in FIG. 4, the erector 17 includes a guide ring 19 formed in a plate ring shape so as to form a predetermined gap L2 with the inner circumference of the outer shell 9. By the rotation operation, it is movable along the shield inner circumferential direction shown by the arrows C and D. That is, on the inner circumference of the outer shell 9, as shown in FIG. 4, several guide rollers 20 are provided at the tip of the support rod 20a having a length corresponding to the gap L2 between the guide ring 19 and the outer shell 9, The guide ring 19 is mounted so as to be rotatable in the directions of arrows M and N in FIG.
By 0, it is held on the inner side of the outer shell 9 so as to be rotationally driven along the inner circumferential direction of the shield. On the guide ring 19, the arm 17a of the erector 17 is
An arrow E that is rotatable in the inner circumferential direction of the shield (directions of arrows C and D) and is a radial direction via the guide ring 19.
It is mounted so that it can be driven to project and retract in the F direction.
The segment 17a is provided with a segment gripping portion 17b in such a manner that the segment piece can be gripped and released.

At the rear portion of the outer shell 9, as shown in FIG. 2, a propulsion jack 21 capable of propelling the entire shield device 7 in the ground 2 toward the arrow A direction which is the propulsion direction thereof.
However, as shown in FIG. 4, a plurality of them are fixedly mounted along the inner circumference of the outer shell 9, and each propulsion jack 21 has a ram 21a already formed as described above as shown in FIG. And the front end 5 of the new pipe 5 that is placed inside the outer shell 9 and arranged.
In order to obtain a propulsion reaction force in a, it is provided so that it can be driven to project and retract in the directions of arrows A and B. A spreader 22 is mounted on the tip side of each ram 21a, which is the rear side of the propulsion jack 21, so that the propulsive forces of the plurality of propulsion jacks 21 are arranged along the inner circumference of the outer shell 9. The spreader 22 can be evenly distributed over the entire front end 5a of the new pipe 5.

Further, in the outer shell 9 of the shield device 7, as shown in FIG. 2, an inner cylinder 23, which is a crushing core formed into a cylindrical shape having an inner diameter slightly larger than the outer diameter of the iron pipe 6,
In a form that surrounds the outside of the iron pipe 6 (that is, inside the iron pipe 6
The inner cylinder 23 in the embodiment, which is provided so as to project to the center of the cutter head 10.
Is adapted to be slowly driven to rotate in the shield circumferential direction (directions C and D in FIG. 3) in conjunction with the rotational movement of the cutter head 10. A packing 24, which is formed in an annular shape so as to seal the space between the inner cylinder 23 and the iron pipe 6, is fitted in the vicinity of the front end of the inner peripheral surface of the inner cylinder 23 in the direction of arrow A in FIG. The packing 24 is provided here such that the inner cylinder 23 is rotatable with respect to the iron pipe 6.

On the outer periphery of the inner cylinder 23, a crushing projection 25 made of a wear-resistant hard material is welded as a reinforcing bar crushing bit, and the crushing projection 25 guides the cutter head 10 as shown in FIG. Saw blade 101 provided on the portion 10d
And have a shape of facing each other with a certain gap. Due to the gap, the shield device 7 has a shape in which the dismantled material transfer gap 26 is formed in a cylindrical shape between the cutter head 10 and the inner cylinder 23, and the crushing protrusion 25 described above is formed.
Is provided in the inner cylinder 23 so as to face the demolition material transfer gap 26. Further, the above-mentioned saw blade 101 is provided in the guide portion 10d, which is a portion of the cutter head 10 that faces the dismantled object transfer gap 26, and therefore,
Skeleton piece 31 'of old pipe 3, rebar 32, or filler 3
The excavation scrap 41 due to the ground 3, the ground 2, and the like can be taken into the excavation chamber 10c through the dismantled object transfer void 26.

As shown in FIG. 2, on the inner peripheral side of the inner cylinder 26, a plurality of guide rollers 27A rotatable with respect to the outer peripheral surface of the iron pipe 6 are arranged along the inner peripheral direction of the inner cylinder 26. It is provided. Further, the girder portion 92 located at the rear portion of the shield device 7 is provided with a steel pipe insertion portion 92a.
It is formed so that the axis of 2a is aligned with the axis CL1 of the shield device 7, and penetrates in the directions of arrows A and B,
A plurality of guide rollers 27B similar to the guide rollers 27A are provided in the steel pipe insertion portion 92a in the circumferential direction so as to be rotatable with respect to the outer peripheral surface of the steel pipe 6. Then, in the steel pipe insertion portion 92a provided with the rear guide roller 27B, a sensor 28 capable of detecting a gap Wn between the inner surface of the girder forming the steel pipe insertion portion 92a and the outer peripheral surface of the iron pipe 6. However, a plurality of sensors 28 are provided along the inner circumferential direction of the shield as position detecting means for detecting the position of the outer shell 9 with respect to the iron pipe 6.
9 are connected respectively.

The attitude control device 29 drives each of the plurality of propulsion jacks 21 by a driving amount corresponding to each of the values of the gap Wn detected by the plurality of sensors 28 so that the plurality of gaps Wn are constantly maintained. The attitude control of the shield device 7 is performed so as to approach the matched value, that is, the attitude control device 2
9 and the plurality of propulsion jacks 21 constitute a posture adjusting means in the shield device 7 in a form of adjusting the posture of the outer shell 9 based on the position of the outer shell 9 with respect to the iron pipe 6 detected by the plurality of sensors 28. is doing. As a result, the shield device 7 inserts and supports the steel pipe 6 so that the shaft center of the steel pipe 6 matches the shield shaft center CL1.
It is controlled so that the propulsion operation can be performed toward the arrow A direction side.

Since the sewer 1 and the shield device 7 have the above-mentioned constructions, in order to repair the aged pipe 3 using the shield device 7, the water flow through the aged pipe 3 is temporarily stopped. Or, by switching to another route, sludge treatment, pipe cleaning, branch pipe removal, etc., and pretreatment such as temporary road lining as a countermeasure against the depression of the ground 2a above the aged pipe 3 The iron pipe 6 is temporarily installed in a manner that the manholes 2s and 2s are connected to each other. At this time, the iron pipe 6 having a predetermined length is put in from the manhole 2s, and a plurality of iron pipes 6 are lined up in the tunnel axis direction and sequentially welded, so that the iron pipe 6 can be easily temporarily installed in the aged pipe 3. You can The manhole 2s may be enlarged as shown by the broken line in FIG. 1 and used as a working shaft. In this way, the sewage flowing to the old pipe 3 until now
When collected and flown into the flow path FL in the iron pipe 6 that is temporarily installed therein, the area inside the aged pipe 3 located outside the iron pipe 6 becomes a dry state in which sewage does not flow.

Therefore, the aging pipe 3 outside the iron pipe 6 is filled with a filler 33 made of a low-strength curable material such as mortar. That is, when the cutter head 10 of the shield device 7 is rotated, each bit 11 is prepared so as to scrape some solid member such as the ground 2, the aged pipe 3, and the filler 33. In this state, as shown by the broken line in the right part of FIG. 1, the shield device 7 is started from an appropriate starting shaft using the manhole 2s. At this time, as shown in FIG. 1, in the shield device 7, the outer shell 9 extends from the rear end 3b of the aging pipe 3 which has not been dismantled and removed to the rear side thereof so that the outer shell 9 covers the outer side of the iron pipe 6. The inner cylinder 23 is arranged so as to surround it, that is, the inner tube 23 surrounds the iron pipe 6. Then, in the front part of the shield, the skeleton 31 of the aged pipe 3 is dismantled and removed, and the ground 2 around the aged pipe 3 is excavated (that is, the existing pipeline is enlarged), while segment pieces are built in the rear part of the shield. In this manner, the segments 51 of the new pipe 5 which is one size larger than the aged pipe 3 are built up one ring at a time (that is, the pipe line is renewed).

In order to propel the shield device 7, first,
The rams 21a of the plurality of propulsion jacks 21 are driven to project, and the outer shell 9 is connected and supported via the spreader 22 to the front end 5a of the newly installed and constructed new pipe 5. At the initial stage of the excavation of the shield device 7, the outer shell 9 is supported by a stand installed in a vertical shaft using the manhole 2s to start the propulsion, and the outer shell 9 is newly installed behind the outer shell 9 by a forward distance. The segment 51 of the pipe 5 is built so as to be supported by the ground 2, and when the segment 51 is built up to some extent, the shield device 7 is supported by the new pipe 5 as described above. Thus, the mud 40 is passed through the mud pipe 13.
To the excavation chamber 10c,
By the earth pressure of the mud soil 40 supplied and filled in c, the cutter head 10 is moved toward the cutter head 10 while suppressing the face 2b of the ground 2, the skeleton 31 which has not been dismantled and removed, the filler 33, and the like.
Alternatively, it is driven to rotate in the D direction. At this time, the inner cylinder 23 is also slowly driven to rotate. Then, the cutter head 10
The plurality of bits 11 mounted on the cutter wheel 10b of No. 1 are rotated while being driven in the directions of arrows C or D in FIG.
It is pressed through the propulsion jack 21 toward the front side shown in the arrow A direction. This allows the cutter wheel 10
As shown in FIG. 2, the plurality of bits 11 mounted on b are the ground 2, the aged pipe 3 and the excavation surface 10g of which are in contact with each other.
The rear end 3b and the filler 33 in the aged pipe 3 are pressed and crushed while rotating while being pressed. Then, the shield device 7 can be propelled in the direction of the arrow A by the amount of the ground 2, the aged pipe 3, and the filler 33 crushed.
Further, by the propulsion operation of the shield device 7, the ground 2 around the aged pipe 3 is enlarged and excavated to a diameter corresponding to the cutter head 10 of the shield device 7 having the diameter D1. That is, on the rear side of the cutter head 10 of the shield device 7, the enlarged tunnel space 4 in which the diameter of the pipe line formed by the aged pipe 3 is enlarged is formed in a cylindrical shape having a diameter D1.

By the way, the shield device 7 has the reinforcing bar 3 embedded in the frame 31 of the aging pipe 3 during its propulsion operation.
The skeleton 31 must be crushed while crushing 2. At this time, the skeleton body 31 is, as shown in FIG.
The ground 2 located on the outer side and the filling material 33 filled in the aged pipe 3 are in contact with the bit 11 being rotationally driven, with both sides of the inner wall surface and the outer wall surface thereof being constrained.
Since the excavated surface 10g of the cutter head 10 is formed so as to be recessed from the outer peripheral side toward the center, the ground 2 crushed by contacting the bit 11, the skeleton piece 31 'of the skeleton 31, and the filling. The crushed pieces of the material 33 are guided to the dismantled matter transfer gap 26 side along the inclined shape of the excavated surface 10g in a form gathering at the center of the cutter wheel 10b forming the excavated surface 10g. Then, the fragment is sent as an excavation scrap 41 through the dismantled object transfer gap 26 to the rear side in the direction of arrow B, that is, in the excavation chamber 10c. Further, a plurality of rebars 32 are provided inside the body 31 side by side along the pipe axis direction and the pipe circumferential direction. However, the rebars 32 are cut immediately when they come into contact with the bit 11. Even if the cutter head 10b is not provided, the cutter wheel 10b leans toward the center of the cutter head 10 in a shape that folds inward due to the inclined shape of the cutter wheel 10b. That is, do not escape to the natural ground 2 side. Then, as shown in FIG. 5, the rebar 32 is rubbed in the dismantled object transfer space 26 by the saw blade 101 provided in the guide portion 10d of the cutter head 10 and the crushing projection 25 of the inner cylinder 23. , Crushed. Therefore, the reinforcing bar 32 is
It is sent to the excavation chamber 10c in a state of being reliably crushed without being cut off and not diverting somewhere. Therefore, as described above, the excavation slip 41 in the excavation chamber 10c formed by disassembling the aging pipe 3 and expanding the pipeline through the propulsion operation of the shield device 7,
The crusher 16 is passed through the intake port 15a, further crushed, conveyed to the rear side of the shield through the sludge discharge pipe 15, and conveyed outside the pipe through the manhole 2s.

Thus, as described above, the shield device 7
Is propelled in the direction of arrow A for a predetermined distance, that is, for example, by the stroke of the propulsion jack 21 having a shape corresponding to the ring width L1 of the newly installed segment 51. Then, at this time, the inner cylinder 23 is driven to rotate slowly with respect to the iron pipe 6, and the packing 24 is attached to the tip of the inner cylinder 23.
Therefore, the shield device 7 can be smoothly propelled between the inner cylinder 23 and the iron pipe 6 without clogging of the object to be excavated. Further, during the shield propulsion operation, the shield device 7
At the same time as the propulsion operation, the attitude control device 29 causes each of the plurality of sensors 28 arranged in the circumferential direction to detect the gap Wn between the inner surface of the girder of the steel pipe insertion portion 92a and the outer peripheral surface of the steel pipe 6, respectively. The plurality of propulsion jacks 21 are controlled and driven so that each propulsion jack 21 is driven by an amount corresponding to each value of the gap Wn. That is, the shield device 7
Causes the sensor 28 to detect the position of the outer shell 9 with respect to the iron pipe 6, and based on the detected result, the attitude control device 29 and the propulsion jack 21 cause the outer shell 9 to be in a predetermined position state with respect to the iron pipe 6. Adjust the posture so that As a result, the attitude of the shield device 7 during propulsion is controlled so that the shield axis CL1 is always aligned with the axis of the steel pipe 6. Then, there is no risk that the respective components of the shield device 7 will lie against the iron pipe 6 and deform the iron pipe 6. In addition, the shield device 7
Can be propelled in the correct direction by being guided by the iron pipe 6 which is temporarily installed to connect the manholes 2s, 2s.
Therefore, the enlarged tunnel space 4 is formed in the correct position around the old pipe 3, and the new pipe 5 can be renewed and constructed therein.

That is, as described above, the outer shell 9 of the shield device 7 is propelled by the distance L1 while crushing the aged pipe 3, the ground 2 around it and the filling material 33 inside thereof, and in this state, When the propulsion jack 21 is driven backward, a new one-ring segment 51 is provided between the spreader 22 mounted on the ram 21a of the retreated propulsion jack 21 and the front end 5a of the newly installed pipe 5. A space for building is formed. Therefore, in the space, the electa 17
The new pipe 5 is constructed and extended by building the segment 51 by using. It should be noted that the erector 17 has an arm 17 on a guide ring 19 in which the iron pipe 6 is inserted and arranged at the center thereof.
Since the segment grip 17b is attached via a, the segment 51 can be smoothly built without interfering with the iron pipe 6. Therefore, segment 51
Is an enlarged tunnel space formed by excavating the cutter head 10 of the shield device 7 in such a manner that several segment pieces are connected in a ring shape with the iron pipe 6 arranged at the center thereof. Build on the outer circumference of No. 4.

In this way, while dismantling and removing the frame 31 of the aged pipe 3, the ground 2 around the aged pipe 3 is enlarged and excavated to form an enlarged tunnel space 4, and a new pipe 5 is constructed here. A series of work is repeated in a predetermined cycle. Then, a series of work for expanding and replacing the old pipe 3 which is an old pipe to the new pipe 5 is performed outside the shield device 7 without any interference with the flow passage FL formed inside the iron pipe 6. What is done in the shell 9 is done efficiently and reliably. Therefore, the work can be performed while using the inside of the iron pipe 6 as a temporary sewer. Further, during the expansion laying replacement work of the pipeline, even if the skeleton 31 of the aging pipe 3 is made of reinforced concrete, the reinforcing bar 32 inside thereof is reliably crushed as described above, and the shield propulsion operation is performed. Therefore, the expansion and replacement work of the aged pipe 3 will always proceed smoothly.

Although the outer shell 9 of the shield device 7 is formed to have a diameter D1 larger than the diameter of the aged pipe 3 in the above-mentioned embodiment, the enlarged shield device according to the present invention has a cutter. The diameter of the head may be larger than that of the existing pipe to be disassembled. Therefore, as shown in FIG. 6, the diameter of the outer shell 9 may be smaller than the diameter of the aging pipe 3. In the case as shown in FIG. 6, naturally, as a method of constructing a new pipe to be built in place of the aged pipe 3, another method different from the above-described embodiment is applied. Further, in the embodiment, the example of the shield device 7 in which the shell body such as the outer shell 9 is formed in a cylindrical shape has been described. However, the shell body must be propelled in the ground 2 for the shield advancing operation. If it is possible, it is not always necessary to have a cylindrical shape, and for example, it may be formed into a tubular shape having an oval cross section. Furthermore, in the embodiment, after the dismantling of the aged pipe 3, the new pipe 5 by the segment 51 is expanded to the tunnel space 4
Although the example of building a new pipe was described, the construction of the new pipe is arbitrary.

Further, the crushing core such as the inner cylinder 23 is not necessarily the shield axis CL1 as described in the embodiment.
It does not have to be rotatable about the center. Even when the crushing core that does not rotate is used to surround the temporary pipe such as the iron pipe 6 as described above, no problem occurs if the crushing core can slide with respect to the temporary pipe. Further, even when the inner cylinder 23 is rotatable, the direction of rotation, the drive source for driving the rotation, and the like are arbitrary.

Furthermore, in the embodiment, the iron pipe insertion portion 92a of the outer shell 9 is utilized to make a gap Wn between the inner surface portion of the outer shell 9 forming the iron pipe insertion portion 92a and the outer peripheral surface of the iron pipe 6. A plurality of sensors 28 capable of detecting the position of the outer shell 9 are provided side by side along the circumferential direction, and the positions of the outer shell 9 with respect to the iron pipe 6 are adjusted by the attitude adjusting device including the attitude control device 29 and the propulsion jack 21. Although the example in which the shield propulsion is performed while adjusting the above is described, the configuration of the position detecting means and the attitude adjusting means, the method of using the same, the mounting position, and the like are arbitrary. Further, even with such an enlarged shield device that does not have the position detecting means and the attitude adjusting means, the reinforcing bars 32 and the like can be crushed. Further, in the embodiment, as a reinforcing bar crushing bit for crushing the reinforcing bar 32 embedded in the skeleton 31 of the aged pipe 3, a crushing projection 25 is provided on the outer periphery of the inner cylinder 23, and a guide portion of the cutter head 10. The example in which the saw blade 101 is provided in 10d has been described. However, since the cutter head 10 is originally equipped with a plurality of bits 11 suitable for crushing the skeleton 31, the ground 2, or the filler 33, the bit for exclusive use for crushing the reinforcing bars is It may be provided only on the outer circumference of the inner cylinder 23.

[0029]

As described above, according to the present invention, the existing
When dismantling the installed pipe, the cutter head 10 is rotationally driven to dismantle the existing pipes by crushing the existing pipes into a plurality of bits 11. At this time, the skeleton pieces and rebars of the existing pipes that are being disassembled are removed from the cutter head 10. It is transferred from the outer peripheral side of the excavated surface 10g toward the central portion along the excavated surface 10g, enters the dismantled material transfer void 26, and is crushed by the rebar crushing bit of the crushing core in the dismantled object transport void 26. You can Therefore, if the expanded shield device such as the shield device 7 according to the present invention is used, even if the body of the existing pipe to be dismantled is reinforced concrete, the rebar inside the body of the existing pipe will surely have the dismantled object transfer gap 26. Since it is transferred to and crushed, the rebar inside the body bends through its toughness and deviates to the inside (shield axis side) or the outside (ground side), which interferes with the shield propulsion operation, There is no risk of entanglement between the shell and the ground. That is,
According to the present invention, it is possible to dismantle and remove an existing pipe while reliably crushing a reinforcing bar. Therefore, while constructing a new pipe using the work space inside the shell body, disposing and disassembling the existing pipe by surrounding the existing pipe that has deteriorated or is lacking in function, and disassembling and removing the existing pipe. In the form of performing work, the work of dismantling the pipe and expanding and replacing it,
It is possible to smoothly proceed in the ground 2 without affecting the structure on the ground surface.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view showing an expansion laying replacement work of an existing pipe using an embodiment of the expansion shield device according to the present invention.

FIG. 2 is an enlarged view of the enlarged shield device shown in FIG.

3 is a view of the enlarged shield device shown in FIG. 2 seen from the front side, and is a view taken along the line III, III in FIG.

FIG. 4 is a partially cutaway view of the enlarged shield device shown in FIG. 2 viewed from the rear side, and is a view taken along the line IV and IV in FIG.

FIG. 5 is a partially enlarged side view showing a disassembled state of an existing pipe using the enlarged shield device according to the present invention.

FIG. 6 is a model diagram showing another embodiment of the magnifying shield device according to the present invention.

[Explanation of symbols]

2 ... Ground 3 …… Existing pipe (aged pipe) 6 ... Temporary pipe (iron pipe) 7 ... Expanded shield device (shield device) 9 ... Shell (outer shell) 10 ... Cutter head 10g ... excavated surface 10d ... Part (guide) 101 ... Reinforcing bar crushing bit (saw blade) 23 ... Crushing core (inner cylinder) 25: Reinforcing bar crushing bit (crushing protrusion) 26. Void for dismantling material transfer 21: Posture adjusting means (propulsion jack) 29: Posture adjusting means (posture control device) 28: Position detecting means (sensor) CL1 ... Shield axis center D1 ... Diameter

─────────────────────────────────────────────────── ─── Continuation of front page (73) Patent holder 000002299 Shimizu Construction Co., Ltd. 1-3-2 Shibaura, Minato-ku, Tokyo (73) Patent holder 000206211 Taisei Corporation 1-25-25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 (73) Patent holder 000235543 Tobishima Construction Co., Ltd. 2 Sanbancho, Chiyoda-ku, Tokyo (73) Patent holder 000195971 Nishimatsu Construction Co., Ltd. Toranomon 1-20-10 Minato-ku, Tokyo (73) Patent holder 000140982 Mazumagumi Co., Ltd. 2-5-8 Kita-Aoyama, Minato-ku, Tokyo (73) Patent holder 000174943 Sumitomo Mitsui Construction Co., Ltd. 4-13, Araki-cho, Shinjuku-ku, Tokyo (72) Inventor Kunio Takeda Kanda, Chiyoda-ku, Tokyo 2-chome, Machi Obayashi Corporation Tokyo Head Office (72) Inventor Tatsuro Tamai 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yamamoto Seihiko Tsukudo-cho 2-1, Shinjuku-ku, Tokyo Stock company Kumagai Gumi Tokyo head office (72) Inventor Kiyoshi Katsunuma 2-3-3 Akasaka, Minato-ku, Tokyo Komatsu Ltd. (72) Inventor Hideki Hagiwara 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Masanori Hirachi 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Yoshiomi Shimizu 2 Sanbancho, Chiyoda-ku, Tokyo Within Tobishima Construction Co., Ltd. (72) Inventor Toru Watanabe 2570-4 Shimotsuruma, Yamato-shi, Kanagawa Nishimatsu Construction Co., Ltd. Technical Research Institute (72) Yasuaki Takenouchi Kita-Aoyama, Minato-ku, Tokyo 2-5-8 Intra-company group (72) Inventor Yoshiyuki Takahashi 3-10-1 Iwamotocho, Chiyoda-ku, Tokyo Mitsui Construction Co., Ltd. (56) Reference JP-A-63-189594 (JP, A) JP-A-3-144184 (JP, A) JP-A-6-288181 (JP, A) Actual development Sho 61-62995 (JP, U) JP-B-4-19358 (J (P, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/06 311 E21D 9/08 F16L 1/024

Claims (3)

(57) [Claims] 1. A shell body capable of propelling freely in the ground, Shield the cutter head on the front side of the shell body in the direction of propulsion.
It is provided so that it can be driven and rotated about its axis. The excavation surface of the cutter head is centered from the outer peripheral side of the excavation surface.
It is formed so as to be depressed toward the core, Attach a plurality of bits to the excavation surface,A crushing core inside the shell was placed inside the existing pipe
The temporary pipe is inserted in the crushing core in the form described above.
Providing in the form of protruding in the center of the cutter head, A demolition material transfer gap between the cutter head and the crushing core
Is provided in a cylindrical shape, Attach a rebar crushing bit to the outer periphery of the crushing core
Expanded shield device that is installed and configured to face the air gap
Place 2. The expansion shield device according to claim 1,
When dismantling and removing the existing pipe, Inside the existing pipe, a temporary pipe with a flow channel formed inside is installed.
Temporarily lined up in the axial direction of the tunnel, The outside of the temporarily installed temporary pipe is surrounded by the crushing core.
In the form of, the temporary pipe is inserted into the crushing core, In that state, the cutter head is rotated to drive the cutter.
Guide the temporary pipe while crushing the existing pipe with the head
Expanded sea, which is configured to be promoted in the form of
Ludo construction method. 3. The expansion shield device according to claim 1,
When dismantling and removing the existing pipe, Inside the existing pipe, a temporary pipe with a flow channel formed inside is installed.
Temporarily lined up in the axial direction of the tunnel, Filling the filling material into the existing pipe outside the temporary pipe, The outside of the temporarily installed temporary pipe is surrounded by the crushing core.
In the form of, the temporary pipe is inserted into the crushing core, In that state, the cutter head is rotated to drive the cutter.
While crushing the existing pipe and filler with the head,
It is constructed so that it is propelled in the form of being guided by the installation pipe.
The expanded shield method.