JPH059599B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is a method for replacing an existing culvert and replacing the existing culvert, in which a new culvert is laid while excavating and removing the existing culvert using an excavator. Regarding excavators.

<Conventional technology> The shield method was rapidly adopted for the construction of culverts in the 1960s, but after that, the culverts needed to be renovated or repaired due to lack of capacity or deterioration. As a method,
For example, if a subway culvert is deformed in soft ground, the cross section should be reinforced with steel rings and reinforced concrete (also called reinforced lining), and in case of water leakage, water should be directed to a drainage drain or water stoppage work should be carried out. This method was used.

<Problems to be Solved by the Invention> However, although the above-mentioned culvert repair methods can perform local repairs, they cannot completely repair the culvert itself. For example, if you want to carry out a complete renovation, the method is to improve the surrounding ground, then dismantle and remove the segment (hereinafter referred to as the repair segment), and then install a new segment (hereinafter referred to as the new construction segment). Conceivable. However, this method has the disadvantage that it requires a great deal of effort and time to dismantle and transport the repaired segment.

This invention was made in view of such conventional problems, and its purpose is to provide a simple system in which the main body of the excavator is propelled toward the existing culvert by a traction device.
The object of the present invention is to provide a method for replacing an existing culvert by efficiently crushing and removing the culvert and simultaneously laying a new culvert, and an excavator for replacing the existing culvert.

<Means for Solving the Problems> This invention has been made to achieve the above object, and its gist is to replace the existing culvert with a new culvert after crushing and removing it using an excavator. In the construction method, a traction device that runs within the existing culvert is disposed, the gripper of this traction device is held in the existing culvert to bring the traction device into a stopped state, and the excavation machine and the traction device are connected to each other. By contracting the connected hydraulic cylinder, the excavator excavates while crushing the existing culvert, and when this excavation reaches a predetermined amount, the gripper is released from holding, and then the hydraulic cylinder is extended. , a method for replacing an existing culvert, characterized in that the towing device is moved in the excavation direction, and a hump pipe is pushed into the rear part of the excavating machine using a propulsion jack to add to the excavation.

In addition, as another gist of the present invention, there is provided an excavator which has a rotatably driven cutter head at its tip and is capable of excavating an existing culvert with the cutter head, and an excavator which is located in front of the excavator and which excavates the inner periphery of the existing culvert. A traction device having a means for gripping the excavator by protruding from a surface, and a hydraulic cylinder connecting the traction device and the excavator are provided, and the hydraulic cylinder is contracted to remove the existing culvert with the traction device gripped onto the existing culvert. There is an excavator for replacing existing culverts, which is characterized by excavating culverts.

<Function> The towing device of the present invention moves into the existing culvert, travels while repeatedly stopping, and expands and contracts the hydraulic cylinder in parallel with this operation, thereby towing the excavator forward. It acts to gradually crush and remove the culvert. For this reason, when towing, the towing device is fixed in the existing culvert with grippers, etc., the hydraulic cylinder is contracted to tow the excavator, and after this towing is completed, this fixation is released to allow the towing device to move forward. ,
The excavation work by towing as described above is enabled again, and by repeating this operation, the excavation is continued. In addition, the propulsion jack acts to further push the hume pipe pushed into the gap formed at the rear of the excavator in the excavation direction, thereby continuously forming a new culvert.

<Embodiments of the Invention> FIG. 1 is a sectional view of essential parts showing an embodiment of the invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1. In the figure, A is a vertical shaft excavated from the ground in the area where there is an existing culvert that is to be excavated and removed, and a bridge-type crane, etc., for transporting humid pipes and various equipment will be installed at the entrance of this shaft A. Note that the vertical shaft A is provided so as to communicate with a ready-made culvert as shown in the figure. Reference numeral 1 denotes the existing culvert to be removed according to the present invention, and within the existing culvert 1, a towing device 2 having a traveling mechanism such as wheels or a sled is provided so as to be operable to stop. Reference numeral 3 denotes a gripper that is integrally provided with this traction device 2, and by hitting a friction plate 3a attached to the end of an arm such as a jack or a hydraulic cylinder against the inner surface of the culvert 1, it makes the traction device 2 unable to run and stops it. It acts to firmly hold the position. A roof 4 is attached to the upper part of the traction device 2 so as to protrude rearward, and this prevents the lining being cut from collapsing onto a hydraulic cylinder 7, which will be described later. Reference numeral 5 denotes an excavator, and a rotatable ring-shaped cutter head 6 is attached to the tip of the excavator, and the cutter head 6 is adapted to hit against the end face of the ready-made underdrain 1. 7 is a telescopic hydraulic cylinder that connects the traction device 2 and the excavator 5, 8 is a newly installed humuum blue installed at the rear of the excavator 5 in place of 1 in the existing culvert that has been crushed and removed, and 9 is this A press ring 10 is interposed between the newly constructed humid pipe 8 and the remaining existing underdrain 1 that does not need to be removed, and the humid pipes 8 are pushed in one after another to connect them while preventing the excavator 5 from retreating. I'm really excited about the promotion.

Although not shown, if necessary, the existing culvert 1
Another shaft for carrying out the rubble to be crushed and removed may be provided at a predetermined position of the extended portion of the pipe, and a crane for carrying out the rubble may be installed in this shaft. In addition, the existing culvert 1 and the new culvert are provided with a bulkhead (not shown) through which a hydraulic cylinder 7 separates the working area, and the working area partitioned by this bulkhead is filled with muddy water or air to maintain high pressure, and the working area is kept at high pressure. This is designed to prevent accidents such as the lining, earth and sand from collapsing.

Next, the operation will be explained.

First, in the related state of the traction device 2, excavator 5, and hydraulic cylinder 7 as shown in the figure, in order to crush and remove the existing culvert 1, the friction plate 3a of the gripper 3 hits the inner surface of the existing culvert 1, Hold the traction device 2 so that it does not move from its position.
Subsequently, the hydraulic cylinder 7 is contracted with a constant force. For this reason, the rotationally driven excavator 5
The upper cutter head 6 is installed from the end of the existing culvert 1.
This will be gradually crushed and excavated. When the amount of excavation reaches a predetermined value, the holding of the traction device 2 by the gripper 3 is released, the hydraulic cylinder 7 is fully extended, and the traction device 2 is advanced by the amount of extension of the hydraulic cylinder 7. Therefore, there is a gap between the excavator 5 or the newly installed fume pipe 8 connected to it and the propulsion jack 9 by the amount of elongation described above, but the propulsion jack 9 operates (extends) to close the gap. and Huyum canal 8
After pushing it in the excavation direction, it contracts by an appropriate amount, and a new hume pipe 8 is inserted between the rearmost hume pipe 8 and the propulsion jack 9, and then the propulsion jack 9 to help the operation of the excavator 5.

Furthermore, after the traction device 2 is moved forward,
Again, this traction device 2 is held in the existing culvert 1 by the gripper 3, the extended hydraulic cylinder 7 is contracted, the excavator 5 is further propelled forward, and the newly constructed humid pipe is moved as described above. Add 8 one after another.

By repeating and continuing such operations, the existing culvert can be continuously and efficiently crushed and removed, and a new humid pipe can be laid in parallel. In addition, when expanding the diameter of a newly constructed culvert using a newly constructed hump pipe,
It is sufficient to use a cutter head 6 of the excavator 5 with a larger diameter.

<Effects of the Invention> As explained above, according to the present invention, a traction device that travels while taking a reaction force through a gripper is provided in an existing culvert, and this traction device and a propulsion device for crushing and removing the existing culvert are connected. are connected by a hydraulic cylinder, and by expanding and contracting this hydraulic cylinder, the existing culvert is automatically and continuously crushed and removed. By adding other newly installed fume pipes and pushing them in using a propulsion jack, a new underdrain can be formed continuously and efficiently. Further, according to the re-laying method using such a re-laying excavator, there is no obstruction to nearby buried objects, and there is no restriction on surface traffic.

In particular, the reason why this invention installs the towing device in the existing culvert so that it can run and stop is that if only the conventional propulsion device was used, the propulsion directionality of the shield machine would deteriorate due to the cutting torque when cutting the pipe of the existing culvert. . If it is towed, the direction of propulsion can always be kept in the direction of the existing pipe.

On the other hand, when cutting the existing pipe, it is expected that the pipe will crack and cause the ground to collapse, but in order to prevent this, a gripper mechanism was installed inside the existing pipe to prevent it from collapsing. This gripper has the above-mentioned propulsion assisting function in addition to the above-mentioned collapse prevention function.

Furthermore, the present invention has the effect that the mechanical design is advantageous by arranging the movable power unit of the excavator on the existing culvert side and the crushed debris removal device on the new culvert side.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of the area around the excavator, illustrating a construction method using an excavator for replacing existing culverts according to the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1. 1... Existing culvert, 2... Traction device, 3... Gripper, 5... Excavation machine, 6... Katsutahed, 7
... Hydraulic cylinder, 8 ... Newly installed humid pipe, 9 ...
...Propulsion jack.

Claims (1)

[Scope of Claims] 1. In a re-laying method in which an existing culvert is crushed and removed using an excavator and then replaced with a new culvert, a traction device that runs within the existing culvert is provided, and a gripper of this traction device is installed. the traction device is stopped by holding it in an existing culvert;
By contracting a hydraulic cylinder connected to the excavator and the traction device, the excavator excavates the existing culvert while crushing it, and when the excavation reaches a predetermined amount, releases the hold on the gripper. moving the traction device in the digging direction by extending the hydraulic cylinder from
A method for replacing an existing culvert, characterized in that a hump pipe is pushed into the rear part of the excavating machine using a propulsion jack and added to the culvert. 2. Has a cutter head that rotates at the tip,
An excavator capable of excavating an existing culvert with the cutter head, a traction device located in front of the excavator and having means for protruding and gripping the inner peripheral surface of the existing culvert, the traction device and the excavator. 1. An excavator for replacing an existing underdrain, characterized in that the excavator is provided with a hydraulic cylinder connecting the towing device to the existing underdrain, and excavates the existing underdrain by contracting the hydraulic cylinder while gripping the traction device to the existing underdrain.