JPS63138097A - Method of re-laying construction of existing culvert - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for replacing an existing culvert, in which a new culvert is laid while 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, the culverts needed to be renovated or repaired due to lack of capacity, deterioration, etc.

Conventionally, methods for repairing the above-mentioned culverts include, for example, reinforcing the cross section with steel rings and reinforced concrete (also called reinforced lining) when a subway culvert is deformed in soft ground, or installing drainage drains in case of water leakage. The methods used were to either direct water to the area or implement water shutoff construction.

<Problems to be Solved by the Invention> However, all of the above-mentioned culvert repair methods can perform local repairs, but cannot completely repair the culvert itself. For example, if you want to carry out a complete renovation, improve the surrounding ground, then segment (
One possible method is to dismantle and remove the repair segment (hereinafter referred to as the repair segment) and install a new segment (hereinafter referred to as the new installation segment) behind it. 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 the problems of the prior art, 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 towing device, and the culvert can be excavated and removed efficiently. The purpose of the present invention is to provide a method for replacing an existing culvert by simultaneously laying a new culvert.

<Means for Solving the Problems> The present invention has been made to achieve the above object, and includes a traction device that runs and stops within an existing culvert, an excavation machine that excavates the existing culvert, and this traction device and excavation machine. A towing jack is provided to connect the machine, and by expanding and contracting the towing jack and advancing the towing device, the excavation machine excavates and removes the existing culvert, and after excavation, the hump pipe is pushed into the rear of the excavating machine by the propulsion jack. It was designed to be added to.

<Function> The towing device of the present invention repeatedly moves and stops inside the existing culvert, and extends and contracts the traction jack in parallel with this operation to tow the excavator forward, thereby moving the excavator into the existing culvert. It works to excavate and remove the area one by one. For this reason, when towing, the towing device is fixed in the existing culvert with a gripper, etc., the towing jack 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 created at the rear of the excavator by the excavation in the excavation direction, and acts to continuously form a new culvert. FIG. 1 is a sectional view of essential parts showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG.

In the figure, A is a vertical shaft excavated from the ground in the area where the existing culvert that is to be excavated and removed is located, and a bridge-type crane, etc., for transporting humid pipes and various equipment will be installed at the entrance of this shaft A. In addition, the vertical shaft A is provided so as to communicate with the existing culvert as shown in the figure. 1 is the above-mentioned existing culvert to be removed by this invention, and this existing culvert 1
Inside, a traction device 2 with wheels that runs on rails or the like 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 the traction jack, 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 this cutter head 6 is adapted to abut against the end face of the existing culvert 1. 7 is a telescopic towing jack that connects the traction device 2 and the excavator 5; 8 is a newly installed hump pipe installed at the rear of the excavator 5 in place of the existing culvert 1 that has been excavated and removed; 9 is the newly installed A press ring 10 is interposed between the hump pipe 8 and the remaining existing culvert 1 that does not need to be removed,
This is a propulsion jack that pushes in and connects the fume tubes 8 one after another while preventing them from retreating.

Although not shown in the drawings, if necessary, another shaft for carrying out the rubble to be excavated and removed may be provided at a predetermined position in the extension of the existing culvert 1, and a crane for carrying out the rubble may be installed in this shaft. You can do it. Furthermore, the existing culvert 1 and the new culvert are provided with a bulkhead (not shown) that separates the working section, and this working section is maintained at high pressure to prevent the lining from collapsing during the work.

Next, the operation will be explained.

First, in the related state of the traction tear W2, the excavator 5, and the traction jack 7 as shown in the figure, in order to excavate and remove the existing culvert 1, the friction plate 3a of the gripper 3 must be inserted into the existing culvert 1.
The traction device 2 is held against the inner surface of the traction device 2 so that it does not move from that position.

Subsequently, the traction jack 7 is contracted with a constant force. For this reason, the cutter head 6 on the excavator 5, which is being driven once, is cut from the end face of the existing culvert 1.

We will gradually dig into this. When the amount of excavation reaches a predetermined value, the holding of the traction device 2 by the gripper 3 is released, the traction jack 7 is fully extended, and the traction device 2 is advanced by the amount of extension of the traction jack. Therefore, a gap is created 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 this gap. After pushing the fume pipe 8 in the excavation direction, it contracts by an appropriate amount, and into the gap created by this between the rearmost hume pipe 8 and the propulsion jack 9, a newly installed fume pipe 8 is inserted, and then the propulsion jack is inserted. 9 to help the operation of the excavator 5.

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 traction jack 7 is contracted, and the excavator 5 is further propelled forward. Then, as described above, newly installed Huyum tubes 8 are added one after another.

By repeating and continuing such operations, the existing culvert can be continuously and efficiently excavated and removed, and a new humid pipe can be laid in parallel. In addition, when expanding the diameter of a newly installed culvert using a newly installed humid 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 movable and stopable traction device is provided inside the existing culvert, and the traction device and the propulsion machine for excavating and removing the existing culvert are connected by a traction jack. By connecting the towing jack, the existing culvert can be automatically and continuously excavated and removed by expanding and contracting the towing jack, and each time the excavator excavates, it is possible to remove other newly constructed hium pipes behind the excavator or the newly constructed hium pipe. By adding additional fume pipes and pushing them in with a propulsion jack, new underdrains can be formed continuously and efficiently. Furthermore, according to the excavation method using such an excavator,
Effects such as no obstruction to nearby buried objects and no restrictions on ground transportation can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of the vicinity of an excavator for explaining the method for replacing an existing culvert 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. Cutter head, 7. Traction jack, 8. Newly installed hump pipe, 9. Propulsion jack.

Claims (1)

[Claims] In an existing culvert replacement method in which a new culvert is laid after excavating and removing the existing culvert with an excavator, a traction device that travels while moving and stopping in the existing culvert, and a traction device that connects this traction device and the excavator. Each has a jack, and by contracting the towing jack when the towing device is stopped, the excavator excavates the culvert, and after excavating, the towing jack is extended to move the towing device in the excavation direction. A method for replacing an existing culvert, characterized in that a Hume pipe is pushed into the rear of the excavating machine using a propulsion jack to add to the existing culvert.