JPH0978997A - Segment fabricating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fabricate safely by providing a diameter changeable expansion ring in a shell body of a shield excavator, fabricating segments on the working face side, and pushing out a completed segment ring toward the periphery of the expansion ring. SOLUTION: A propulsion jack 11 is elongated to obtain the driving force of an excavator through transmission to a reaction ring 1, horizontal columns 12, an expansion ring 2 enlarged in diameter and a segment ring through with fabrication. The segment ring is formed by connecting segments in regular order on a fabricating base at a floor part and pulling them up along an annular guide plate 13. The diameter of the expansion ring 2 is then contracted, and the completed segment ring is pushed out toward the periphery of the expansion ring 2 and connected to the segment ring fabricated up to the last time. There is therefore no high liftwork so as to make construction safe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment assembly device.

[0002]

2. Description of the Related Art A shield machine has a structure in which a segment is assembled in a ring shape at the rear of the excavated distance and a reaction force is applied to the segment ring to continue the advance. In that case, the conventional segment assembling apparatus forms a ring while rotating the arm that holds the segment and sequentially pressing and holding the segment from the floor portion to the entire ceiling portion.

[0003]

In the above-mentioned conventional segment assembling apparatus, the assembling of the segment of the floor portion and the side wall portion, and particularly the assembling of the segment of the ceiling portion is a harsh and dangerous work. . That is, at a height of several meters, the heavy segment is presented in an unstable state, and the fine adjustment is repeated to align with the adjacent segment. It was necessary to send the sign of "," and perform the bolt fastening work.

The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a segment assembling apparatus which can be safely assembled without performing work at a high place. To aim.

[0005]

In order to achieve the above object, the segment assembling apparatus of the present invention is provided with an expandable ring whose diameter can be changed inside a shell of a shield machine, and the shield machine is equipped with an expandable ring. The propulsive force of the machine is transmitted to the segment ring that has been assembled up to the previous time by the expanded ring with the expanded diameter, the segments are assembled on the face side of the expanded ring, and the diameter of the assembled segment ring is reduced. The segment assembly device is characterized in that the segment assembly device is extruded toward the outer circumference of the expandable ring and is connected to the segment ring assembled up to the previous time.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a segment assembling apparatus of the present invention will be described below with reference to the drawings.

<a> Reaction force ring In the shield machine, a propulsion jack is arranged inside the shell,
It is a device that takes the reaction force from the segment ring by the jack and digs into the ground. In that case, the shield jack is generally configured to directly contact the segment to take a reaction force. However, in the apparatus of the present invention, the reaction ring 1 is provided inside the shell, and the propulsion jack 11 adopts a configuration in which the reaction force is pushed by pushing the reaction ring 1. The reaction force ring 1 is formed as an annular body that is movable in the shell.

<B> Telescopic Ring The telescopic ring 2 is provided closer to the wellhead than the reaction ring 1.
The expansion and contraction ring 2 is an annular body whose diameter can be expanded and contracted since the expansion and contraction ring 2 is cut in the middle and connected to each other by expansion and contraction jacks. When the diameter of the expansion ring 2 is enlarged, it is equal to the diameter of the segment ring, and when the diameter is reduced, it is smaller than the inner diameter of the segment ring. A plurality of horizontal columns 12 are horizontally arranged on the side of the expansion / contraction ring 2 of the reaction ring 1, and the free ends thereof are brought into contact with the expansion / contraction ring 2. Therefore, the propulsion force of the propulsion jack 11 is transmitted from the reaction ring 1 to the telescopic ring 2 via the horizontal column 12. Further, it is transmitted to the segment ring which has been assembled up to the previous time and is in contact with the segment ring via the elastic ring 2. Since the expandable ring 2 can be expanded and contracted freely, it is not fixed to the end of the horizontal column 12 but only slidably in contact therewith.

<C> Guide plate 13 A guide plate 13 is annularly projected on the side of the expansion ring 2 of the reaction ring 1. The annular guide plate 13 is used as a slide base when pushing up the segment 3 which has been connected at the floor by a pulling device.

<D> Segment lifting device A segment lifting device is attached to the reaction ring 1.
This is a device for pulling up the transported pieces of the segment 3 and pulling them up along the guide plate 13 when they are sequentially connected. However, unlike the conventional erector, it does not have a structure for carrying the segment 3 by expanding and contracting the arm to which the segment 3 is attached. It suffices that the segments 3 can be slid along the guide plate 13 and pushed up in the order in which the connection is completed. This pulling device is provided outside the horizontal column 12 stretched between both rings so that the segment 3 can be gripped and pulled up.

<E> Segment push-out jack In addition to the above-mentioned propulsion jack 11, a push-out jack 4 for pushing out the segment 3 is arranged. The jack 4 is a jack having a long stroke disposed on the face side of the reaction force ring 1, and pushes out the assembled segment 3 ring along the outer circumference of the expandable ring 2 having a reduced diameter. Since it has a long stroke, it is provided on the face side of the reaction ring 1 and is arranged so as to be expandable and contractible through the window 41 opened in the reaction ring 1.

<F> Retreat restraint The shield machine is subjected to earth pressure from the cutting face side. Therefore, it is necessary to reserve the reaction force from the segment 3 group by the propulsion jack 11. In a conventional shield machine, the segments are assembled piece by piece. Therefore, the other jacks can take the reaction force from the segment, since only the jack in that position will interfere with the assembly. However, during normal digging, the digging is performed while applying a reaction force to the intermediate support frame. However, in order to join the already assembled segments after assembling the segments of one ring, it is necessary to shrink the shaft side (expansion ring side) of the intermediate support frame. If it is simply contracted at this time, the shield machine may retract due to the earth pressure on the face of the face.

Therefore, in the shield machine of the present invention,
A fixed wedge 51 is attached to the inside of the tail plate 5 of the shield machine. The fixed wedge 51 has a shape in which the thickness on the face side is zero and the thickness increases toward the wellhead side. On the other hand, a movable wedge 52 is provided on the inner surface of the excavator. It has such a shape that it can be inserted into and pulled out from the fixed wedge 51 from the face side. The movable wedge 52 is inserted between the tail plate 5 and the segment 3 ring of the excavator from the face side. Then, the assembled segment 3 ring is firmly tightened from the surroundings, so that the shield machine can be prevented from retreating.

<G> Segment 3 Assembly Table A segment assembly table is provided at the bottom between the reaction ring 1 and the expansion ring 2. This assembly table has a reaction ring 1
Side and the expansion ring 2 side, the jack is arranged as a positioning jack at a position opposed to each other. Therefore, the segment 3 pieces taken in on the assembly table are corrected in position and direction by fine adjustment of the positioning jacks on both sides, and thereafter the connection is made to the preceding segment 3.

[0015]

[Construction method] Next, the construction method will be described.

<A> At the time of excavation At the time of excavation, the diameter of the expansion and contraction ring 2 is enlarged and applied to the assembled segment ring. Therefore, when the propulsion jack 11 is extended, the propulsion force of the excavator can be transmitted to the reaction force ring 1, the horizontal column 12, the expandable ring 2 having an enlarged diameter, and the segment ring assembled up to the previous time. be able to.

<B> Assembly of Segments As described above, the apparatus of the present invention does not employ the method of pulling up the segments 3 one by one to a predetermined position and attaching them by the arm of the erector. Instead, connect segment 3 in sequence on the floor assembly table,
The connected segment 3 is pulled up along the annular guide plate 13 to form a ring. Until the ring is completed, the arc-shaped segment 3 connecting body slides on the guide plate 13 projecting annularly on the reaction ring 1, so that an accurate circle can be secured.

<C> Restraint restraint of the excavator Until the circular shape is completed, the reaction force of all the propulsion jacks 11 is transmitted to the assembled group 3 of segments. When segment 3 has been assembled for one ring, it must be attached to the assembled segment 3 ring. Then, the existence of the expandable ring 2 becomes an obstacle, but if the diameter is contracted and removed from the end of the segment 3, the excavator cannot take the reaction force against the earth pressure received from the face of the excavator. There is also the risk of retreating. For that purpose, the movable wedge 52 is inserted from the face side between the tail plate 5 and the segment 3 ring of the excavator. Then, by combining with the fixed wedge 51, the assembled segment 3 ring can be firmly tightened from the surroundings, and the backward movement of the shield machine can be prevented.

<D> Extrusion of segment ring The diameter of the expandable ring 2 is reduced while restraining the retreat of the excavator. Then, the assembled segment 3 ring is extruded toward the outer circumference of the expandable ring 2 having a reduced diameter. Then connect it to the segment 3 ring that has been assembled by the previous time. Then, since the segment 3 ring is extended by one ring, the propulsion jack 11 is shortened, the reaction force ring 1 and the expansion ring 2 are pulled toward the face, and the diameter of the expansion ring 2 is enlarged to perform the above work. repeat.

[0020]

Since the segment assembling apparatus of the present invention is as described above, the following effects can be obtained. <A> This is a device for connecting the segments 3 only at the floor portion and successively pulling them up in an arc shape to complete a circular ring.
Therefore, even in the case of a tunnel with a large diameter, there is no need for unstable work such as lifting a heavy segment 3 up to a high place, or work for finely adjusting the position of a heavy object at a high place. Construction can be performed. <B> However, unlike the conventional assembling apparatus, all the jacks 11 must be shortened at the same time because the completed segment ring is attached to the assembled ring at a time, and the excavator is driven by the earth pressure from the face side. There is also the fear that it will recede. Therefore, the movable wedge 52 is inserted between the tail face 5 and the segment 3 ring of the excavator from the face of the excavator, and the assembled segment ring is firmly tightened from the surroundings to prevent the shield excavator from retreating. Has been adopted. Therefore, the segment 3 can be safely attached even if the soil has a large soil pressure. <C> In the case of soil that can be propelled by reaction force tightened from the outside of the segment, segment assembly and excavation can be performed simultaneously, and propulsion cycle time can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a basic configuration of a segment assembly device of the present invention.

FIG. 2 is an explanatory view of an embodiment of a structure for restraining the retreat of the excavator.

FIG. 3 is an explanatory view of an embodiment of a segment pulling device.

FIG. 4 is an explanatory view of a contracted telescopic ring and a segment.

FIG. 5 is an explanatory view of a state where a segment is pulled up by a pulling device.

FIG. 6 is an explanatory diagram of a segment assembly order.

FIG. 7 is an explanatory diagram of a segment assembly order.

FIG. 8 is an explanatory diagram of a segment assembly order.

FIG. 9 is an explanatory diagram of a segment assembly order.

Claims (6)

[Claims] 1. A segment which has been assembled up to the previous time by providing an expandable ring whose diameter can be changed inside the shell of the shield machine, and by which the thrust of the shield machine is expanded by the expandable ring. It transmits to the ring, assembles the segment on the face side of this telescopic ring, pushes the assembled segment ring toward the outer circumference of the telescopic ring with reduced diameter, and connects it to the segment ring that has been assembled by the previous time. , Segment assembly equipment 2. Inside the shell of the shield machine, a reaction ring for receiving the reaction force of the propulsion jack is provided on the face of the face, and a telescopic ring whose diameter can be changed is provided on the side of the well, and the reaction ring is provided. While installing the segment pulling device, a circular guide plate is projected as an assembly stand on the side of the expansion / contraction ring, and the propulsive force of the shield machine is expanded by the expansion / contraction ring with the diameter increased through the reaction ring. It is transmitted to the segment ring that has been assembled up to the previous time, the segment is assembled on the face side of this expansion ring, and the assembled segment ring is extruded toward the outer circumference of the expansion ring whose diameter has been reduced. Segment assembly device that is connected to the segment ring 3. A segment that has been assembled up to the previous time by providing an expandable ring whose diameter can be changed inside the shell of the shield machine, and by expanding and contracting the propulsive force of the shield machine with the expanded ring. It is transmitted to the ring, the segment is assembled on the face side of the expansion ring, a jack for pushing the segment is placed separately from the propulsion jack, and the assembled segment ring is directed to the outer circumference of the expansion ring with a reduced diameter. Segment assembly device that pushes out with a push jack and connects it to the segment ring that has been assembled up to the previous time. 4. A segment which has been assembled up to the previous time by providing an expandable ring whose diameter can be changed inside the shell of the shield machine, and by which the propulsive force of the shield machine is expanded by the expandable ring. It is transmitted to the ring, the segment is assembled on the face side of this expansion ring, and the moving wedge is inserted from the face side to the shield between the wedge fixed inside the outer shell of the shield machine and the assembled segment ring. Prevent the excavator from retreating, then reduce the diameter of the telescopic ring, push the assembled segment ring toward the outer circumference of the telescopic ring with reduced diameter, and connect it to the segment ring that has been assembled by the previous time. The segment assembly equipment 5. A shield ring machine has a shell inside which a reaction ring for receiving a reaction force of a propulsion jack is provided on the face side, and a telescopic ring whose diameter can be changed is provided on the wellhead side. While installing the segment pulling device, an annular guide plate is projected on the expansion ring side as an assembling table, and the propulsive force of the shield machine is expanded by the expansion ring through the reaction force ring. Transfer to the previously assembled segment ring and push the new segment up along the annular guide plate by the pulling device to form the ring, then direct the assembled segment ring to the outer circumference of the reduced diameter telescopic ring Segment assembling equipment that pushes out and connects to the segment ring that has been assembled up to the previous time 6. A shield ring machine has a shell inside which a reaction ring for receiving a reaction force of a propulsion jack is provided on the face of a face and a telescopic ring whose diameter can be changed on the side of a well. While installing the segment pulling device, an annular guide plate is projected on the expansion ring side as an assembling table, and the propulsive force of the shield machine is expanded by the expansion ring through the reaction force ring. It is transmitted to the segment ring that has been assembled up to the previous time, and a segment assembly base is provided between the reaction ring and the expansion ring.This assembly base is composed of the positioning jacks that oppose each other, and the segments are sequentially connected on the assembly base. , The connected segment is pushed up by the pulling device along the annular guide plate to form a ring, and the assembled segment ring is straightened. Extruded toward the outer periphery of the reduced expansion ring is performed by connecting the assembled segment ring up to the previous time, the segment assembly device