JPH0511191B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for removing an existing culvert by excavating and removing the existing culvert using an excavator.

<Conventional technology> The shield method was rapidly adopted for the construction of culverts in the 1960s, but after that, due to lack of capacity and deterioration, culverts needed to be renovated and repaired.

Conventionally, the methods for repairing the above-mentioned culverts are as follows:
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 takes a lot 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 purpose of the present invention is to provide a method for removing an existing culvert that can efficiently cut and remove the culvert.

<Means for Solving the Problems> The present invention has been made to achieve the above object, and the gist thereof is to provide a method for removing an existing culvert by crushing and removing the existing culvert using an excavator. A traction device that runs inside the excavator is disposed, and the gripper of this traction device is held in the existing culvert to stop the traction device, and a hydraulic cylinder connecting the excavator and the traction device is contracted. By doing so, the excavator excavates the existing culvert while crushing it, and when the excavation reaches a predetermined amount, releases the hold on the gripper and then extends the hydraulic cylinder,
The present invention provides a method for removing an existing culvert, characterized in that the traction device is moved in a direction of excavation.

Further, in addition to the above invention, this invention provides a partition between the existing culvert and the new culvert, and maintains a high pressure in the working section between the partitions, thereby promoting the crushing of the culvert by the excavator. It is also possible to adopt a method for removing an existing culvert, which is characterized by the following:

Furthermore, a method for removing an existing culvert may be added to the above invention, characterized in that a newly installed segment is added to the rear of the excavator that is crushing the existing culvert.

<Function> The towing device of the present invention repeatedly moves and stops inside the existing culvert, and extends and contracts the hydraulic cylinder in parallel with this operation, thereby towing the excavator forward. It acts to sequentially crush and remove the pieces. 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.

<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, reference numeral 1 denotes an existing culvert to be removed according to the present invention, and inside the existing culvert 1 is a towing device 2 having a traveling mechanism such as wheels and a sled.
is provided so that it can be stopped. 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 disables the traction device 2 from running. It acts to firmly hold the stopped 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 existing underdrain 1. 7 is a telescopic hydraulic cylinder that connects the traction device 2 and the excavator 5, 8 is a newly installed segment installed at the rear of the excavator 5 in place of the existing culvert 1 that has been crushed and removed, and 9 is a newly installed segment. This is a jack that is interposed between the segment 8 and the excavator 5 to prevent the excavator 5 from retreating.

The existing culvert 1 and the new culvert have bulkheads (not shown) penetrated by hydraulic cylinders 7 that partition the work area.
The work area separated by these partition walls is filled with muddy water or air and maintained at high pressure to prevent accidents such as collapse of lining, earth and sand during work.

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 is hit against 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.

In this state, a gap is created between the jack 9 and the newly installed segment 8 in the diagram at the rear of the excavator 5, so that another newly installed segment can be added to this space.

Subsequently, after the traction device 2 is moved forward, the traction device 2 is again held in the existing culvert 1 by the gripper 3, the extended hydraulic cylinder 7 is contracted, and the excavator 5 is further moved. We will move forward and add new segments as described above.

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

<Effects of the Invention> As described above, the present invention uses an excavator to crush and remove an existing culvert, and in this removal method, the excavator is moved inside the culvert while taking a reaction force through a gripper. Using a traction device, this traction device and an excavator for crushing and removing existing culverts are connected by a hydraulic cylinder, and by expanding and contracting this hydraulic cylinder, the existing culverts are automatically and continuously crushed and removed. , the existing culvert can be removed quickly and efficiently over the entire area rather than locally, and moreover, the existing culvert can be removed mechanically and safely without relying on human power.

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 direction of the shield machine would be poor 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 an existing culvert, it is expected that the pipe will crack and cause the ground to collapse, but in order to prevent this, a gripper was installed inside the existing pipe to prevent it from collapsing. In addition to this function of preventing collapse, the gripper also has a propulsion assist function.

Furthermore, in this invention, by separately arranging the movable power section of the excavator on the existing culvert side and the crushed debris removal device on the new culvert side, it also has the effect of being advantageous in terms of mechanical design. become.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of the vicinity of an excavator for explaining the method for removing an existing culvert according to the present invention, and FIG. 2 is a cross-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 segment.

Claims (1)

[Scope of Claims] 1. In a method for removing an existing culvert by crushing and removing it using an excavator, a traction device that runs within the existing culvert is provided, and a gripper of the traction device is held within the existing culvert. By stopping the traction device and contracting a hydraulic cylinder connecting the excavation machine and the traction device, the excavation machine excavates the existing culvert while crushing it, and the excavation reaches a predetermined amount. A method for removing an existing culvert, characterized in that when the gripper is reached, the gripper is released and the hydraulic cylinder is extended to move the traction device in the excavation direction. 2. A patent characterized in that the existing culvert and the newly constructed culvert are provided with a partition wall that partitions them, and the work section between the partition walls is maintained at high pressure to promote the crushing of the culvert by the excavator. A method for removing an existing culvert as set forth in claim 1. 3. The method for removing an existing culvert according to claim 1, characterized in that a newly installed segment is added to the rear of the excavator that is crushing the existing culvert.