JP2015034427A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine capable of reaching the ground or a side wall of an existing pipe trench safely and efficiently by efficiently cutting the ground or the side wall with an inner surface casing and an outer surface casing.SOLUTION: A shield machine 1 comprises: a cutter head 2 provided at a tip opening part of an outer shell of the shield machine 1; an inner surface casing 4 fitted to an inner peripheral surface of an outer surface casing 3 at a plurality of places in a circumferential direction slidably in a propulsion direction with a slide rail in a projection/recess shape; a push-out jack 6 which is mounted with a cutting blade 5 at the tip of the inner surface casing over the entire circumference while the inner peripheral surface of the inner surface casing is connected to a tip of a cylinder so as to slide the inner surface casing forward and backward and a rear end is connected to the outer surface casing; a rotating shaft 7 pivoted on a center part of the cutter head; and a connection rib material 9 which connects and fixes the back of the cutter head and the inner surface casing so as to transmit rotation to the inner surface casing.

Description

  The present invention is to allow a shield machine to reach and recover at a right angle to the side of an existing pipe by a propulsion method, and to achieve safe and efficient arrival and recovery of a shield machine. It relates to a shield machine.

  In recent urban areas, due to the congested underground structures and the limitations of the ground work base space, it will be difficult to construct a reach shaft, and a method for directly joining the propulsion pipe to the existing pipe will be planned. Specifically, this is applicable to rainwater branch pipe construction that is connected to the rainwater main, and is a method of connecting the rainwater branch pipe in a state of being almost perpendicular to the side of the ultra-large-diameter rainwater main. Many propulsion methods are used. As for the arrival method, when the tip of the shield machine reaches the side of the existing pipe. Once the excavation is stopped, the ground improvement method by chemical injection or the like is applied to the ground between the shield excavator and the existing pipe from the ground or inside the existing pipe, and the surrounding ground is reinforced. The side wall is removed to be slightly larger than the outer diameter of the shield machine, and the ground in front of the shield machine is excavated to construct an outlet. A wall at the entrance port is provided with a wall in the existing pipe wall. When the construction of the reaching pit wall is completed, a method is generally used in which the shield excavator is pushed into the existing pipe rod and recovered by pressing the rearmost end of the propelling pipe row with the main push jack installed in the starting vertical shaft. It was done. However, in the method of joining at right angles to the side of the existing pipe, when the cutter head at the tip of the shield machine reaches the side of the existing pipe, the horizontal center line is almost the same as the side of the existing pipe. The vertical center line part has a large gap on the side and the upper side of the existing pipe pit, but it is assumed that a natural ground collapse etc. is expected when pushing it out to the outlet. You will leave anxiety. In particular, it is difficult to ensure safety in soil conditions with large groundwater pressure and earth pressure or in deep construction.

For this reason, for the purpose of safety and efficient recovery, a cutter head provided at the front end opening of the shield machine outer shell and at least one outer periphery of the cutter head are provided in the radial direction. A widening cutter that expands and contracts, and a slide hood that is fitted on the outer side of the outer shell located behind the cutter head so as to be bent and changed in the propulsion direction so that the tip is in contact with the side surface of the existing pipe rod. A shield excavator comprising a plurality of slide jacks equipped so that the slide hood can move back and forth in the propulsion direction has been developed. As a result of the development of this technology, when the shield machine is adjacent to the side of the existing pipe, the slide hood attached to the outside of the outer shell of the shield machine is pushed forward and the tip of the slide hood is moved to the side of the existing pipe. The gap between the shield machine and the existing pipe is made as small as possible by evenly contacting the wall. In particular, the number of conventional shield machines with large gaps at the top and bottom is reduced, and safe and efficient recovery of shield machines can be performed. However, under construction conditions where the groundwater pressure and earth pressure are large at large depths, the ground improvement method such as the usual chemical solution injection method cannot be expected to be effective because the chemical is instantly diluted or lost. There was a problem that groundwater and earth and sand flowed out from a slight gap between the side surface and the tip of the slide hood, causing the surrounding ground to collapse. For this reason, under the construction conditions where the groundwater pressure and the earth pressure are large at a deep depth, a ground freezing method in which the surrounding ground is frozen in advance and the shield shield machine is reliably recovered is used in combination.

By using the method of recovering shield excavator using the above-mentioned ground freezing method, the surrounding excavated soil is frozen and the shield excavator can be used in a safe state even under construction conditions with large groundwater pressure and earth pressure. It became possible to collect. However, in order to stably freeze the surrounding ground, long-term preparation is necessary, and the material and equipment costs for freezing are huge. There is a problem that this method cannot be adopted.
JP 2010-255344 A

  For this reason, the problem to be solved by the invention is to provide a shield machine for efficiently reaching and recovering a shield machine at a low price even under construction conditions where groundwater pressure and earth pressure are large at a deep depth. It is.

The present invention is a shield machine for joining a propelling pipe to the side of an existing pipe,
A cutter head provided at the front end opening of the shield machine outer shell, at least one widening cutter provided on the outer periphery of the cutter head and extending in the radial direction, and positioned behind the cutter head The inner casing of the outer casing and the inner casing that is fitted with concave and convex slide rails at a plurality of locations in the circumferential direction so as to be slidable in the propulsion direction, and the tip of the inner casing Is equipped with a cutting blade on the entire circumference, and the inner circumferential surface of the inner casing is connected to the front end of the cylinder in order to slide the inner casing to the front and rear. The rear end is the outer casing. A plurality of extrusion jacks connected to the saw, a rotation shaft supported on the center of the cutter head to transmit the rotation to the back of the cutter head, and a rotation transmitted to the inner casing To make the cutter head back Inner surface Ke - a plurality of connecting ribs material and single linked fixedly with the configured shield machine.

  The front surface of the cutter head provided at the tip opening side of the shield machine outer shell is provided with excavation means such as a plurality of cutting bits, and an intake port for taking the excavated earth and sand into the back side. It has multiple locations. The outer diameter of the cutter head is manufactured to a size that does not hinder the extrusion of the inner casing placed on the inner peripheral surface of the outer casing of the shield machine. The widening cutter provided on the outer peripheral portion of the cutter head is fixed by being radially expanded so that a tunnel hole having the outer diameter of the shield machine can be secured during propulsion. The number of the expanded diameter cutters is set to at least one or more on the outer periphery of the cutter head in accordance with soil conditions, pipe diameters, and the like. When the shield machine reaches the front of the existing pipe, the widening cutter is reduced in diameter and stored in the outer peripheral surface of the cutter head so as not to interfere with the inner casing sliding.

  The sliding of the inner casing is pushed forward using the outer casing as a guide by an extrusion jack provided in the circumferential direction of the inner peripheral portion of the inner casing.

  A plurality of cutting tools are provided in the circumferential direction at the front end portion of the inner casing that is fitted to the inner peripheral surface of the outer casing located behind the cutter head. By the connecting rib member in which the back surface of the cutter head and the inner casing are fixed, a rotational force is transmitted to the inner casing and the outer casing through the cutter head.

  The outer casing and the inner casing at the time of propulsion construction are rotated by the rotation of the cutter head being transmitted to the inner casing and the outer casing through the connecting rib member. When the shield machine reaches the front of the existing pipe, the cutter head stops rotating once, and the widening cutter provided on the outer periphery of the cutter head is reduced in diameter so as not to interfere with the inner casing sliding. . When the widened cutter is reduced in diameter and stored in the outer peripheral surface of the cutter head, the rotation of the cutter head is resumed and the rotation is transmitted to the inner casing and the outer casing. Thereafter, the extrusion jack provided on the inner peripheral portion of the inner casing is extended, the inner casing is pushed forward while rotating, and the ground surface and the side wall surface of the existing pipe are removed by the cutting tool provided at the tip. Cut efficiently.

The shield machine according to the present invention temporarily stops the rotation of the cutter head when the shield machine reaches the front of the side surface of the existing pipe rod, and reduces the diameter of the widening cutter provided on the outer periphery of the cutter head. Then, by rotating the cutter head again, the inner casing and the outer casing are rotated, and the extrusion jack equipped on the inner peripheral portion of the inner casing is extended, so that the side of the ground and the existing pipe It became possible to cut wall surfaces efficiently and accurately.

  Cutting technology equipped at the tip of the inner casing fitted to the inner peripheral surface of the outer casing of the shield machine in the propulsion technology that allows the shield machine to reach and collect at a right angle to the side of the existing pipe By rotating and moving forward, the ground in front of the existing pipe and the side wall of the existing pipe were cut, and the shield machine was efficiently reached and recovered.

  FIG. 1 is a longitudinal sectional view illustrating a shield machine according to the present invention. At the tip of the shield machine 1, a cutter head 2 is provided on the tip opening side of the outer casing 3. The cutter head 2 is pivotally supported by the rotary shaft 7 at the center, and the rotational force is transmitted to the cutter head 2 by a drive device installed behind the partition wall 14. Behind the cutter head 2, a cylindrical outer casing 3 having a predetermined length is provided on the rear side. On the inner peripheral surface of the outer casing 3, a projection and recess 10 is provided on the outer casing 3 and a slide groove 11 is provided on the inner casing 4 so as to be slidable in the propulsion direction. A plurality of rails are provided in the circumferential direction. At the tip of the inner casing 4, a cutting blade is provided on the entire circumference so that natural ground and side walls can be cut. The inner casing 4 connects the tip of the inner peripheral surface of the inner casing 4 and the tip of the cylinder in order to slide the inner peripheral surface of the outer casing 3 back and forth, and the rear end is the outer casing. A plurality of extruded jacks 6 connected to the flange part of the singe are arranged; In order to transmit rotational force to the inner casing 4 on the back surface of the cutter head 2, there are a plurality of connecting rib members in the circumferential direction that connect the rear surface of the cutter head 2 and the inner peripheral surface of the inner casing 2. Is fixed.

  At the time of propulsion construction, the cutting blade 5 at the tip of the inner casing 4 is arranged so as to be at the same position on the front surface of the cutter head 2, and is connected to the inner casing 4 via the connecting rib member 9 as the cutter head 2 rotates. Rotation is transmitted. Rotation is also transmitted from the inner casing 4 to the outer casing 3 through an uneven slide rail.

  FIG. 2 is a cross-sectional view for explaining an uneven slide rail equipped in the shield machine of the present invention. The outer casing 3 has substantially the same outer diameter as the following propelling pipe, and is fitted on the inner peripheral surface of the outer casing 3 so that the cutting edge 5 at the tip protrudes beyond the tip of the outer casing 3. It is installed. In the circumferential direction of the outer casing 3 and the inner casing 4, an uneven slide rail is circular so that the projection 10 of the outer casing 4 and the slide groove 11 of the inner casing 4 are aligned. A plurality of places are fitted in the circumferential direction.

  FIG. 3 is a longitudinal sectional view for explaining a construction situation at the time of arrival by the shield machine of the present invention. In normal propulsion construction, the position of the cutting blade 5 at the tip of the inner casing 4 is aligned with the position of the front surface of the cutter head 2, and the inner casing 4 and the outer casing 3 rotate along with the rotation of the cutter head 2. Efficiently cut natural ground. When the cutter bed 2 at the tip of the shield machine 1 approaches the side wall surface of the existing pipe rod 13, the pushing of the shield machine 1 by the main push jack is stopped. Next, while the cutter head 2 is rotated to rotate the inner casing 4, the extrusion jack 6 provided on the inner peripheral surface of the inner casing 4 is extended to cut the cutting blade 5 at the tip of the inner casing 4. The ground and the side walls of the existing pipe 13 are cut. At this time, the main pushing jack is not extended, and the cutter head 2 is rotated at the same position without moving forward. When the cutting of the side wall portion of the existing pipe rod 13 was completed, the surrounding ground was improved from the inside of the existing pipe rod 13 by water injection by a chemical solution injection method or the like, and was cut with the cutting blade 5 at the tip of the inner casing 4. After removing the side wall portion, the entire shield machine 1 is moved forward by the former push jack, and the cutter head 2 portion is pushed into the existing pipe 13.

Cutting of the side wall portion of the existing pipe rod 13 can be performed efficiently by rotation of the cutting blade 5 provided at the tip. A cutting blade is attached so that the outer diameter of the cutting is substantially the same as the outer diameter of the outer casing 3, and the gap between the outer peripheral surface of the outer casing 3 and the side wall can be minimized. It becomes easy to stop water in the gap.

  As described above, by transmitting the rotation of the outer casing 3 and the inner casing 4 of the shield machine through the cutter head 2, the cutting blade 5 provided at the tip of the inner casing 4 can be used as a natural ground or The side wall portion can be cut efficiently without waste, and can be applied to propulsion work for reaching and collecting the shield machine 1 to the side surface of the existing pipe rod 13.

It is a longitudinal section explaining a shield machine of the present invention. It is sectional drawing explaining the uneven | corrugated slide rail with which the shield machine of this invention was equipped. It is a longitudinal section explaining the construction situation at the time of arrival by the shield machine of the present invention.

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Cutter head 3 Outer casing 4 Inner casing 5 Cutting blade 6 Extrusion jack 7 Rotating shaft 8 Reinforcement rib 9 Connecting rib material 10 Protrusion 11 Slide groove 12 Subsequent cylinder 13 Existing pipe rod 14 Partition

Claims (1)

A shield machine for joining a propelling pipe to the side of an existing pipe,
A cutter head provided at the front end opening of the shield machine outer shell, at least one widening cutter provided on the outer periphery of the cutter head and extending in the radial direction, and positioned behind the cutter head The inner casing of the outer casing and the inner casing that is fitted with concave and convex slide rails at a plurality of locations in the circumferential direction so as to be slidable in the propulsion direction, and the tip of the inner casing Is equipped with a cutting blade on the entire circumference, and the inner peripheral surface of the inner casing is connected to the tip of the cylinder to slide the inner casing on the inner peripheral surface, and the outer casing is connected to the rear end. In order to transmit the rotation to the inner casing, a plurality of connected extrusion jacks, a rotating shaft pivotally supported at the center of the cutter head to transmit the rotation to the cutter head on the back of the cutter head On the back and inside of the cutter head - shield machine, characterized in that it is constituted by a plurality of connecting ribs material and single linked fixed.

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