JP5281469B2 - How to remove existing manhole invert - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for removing an invert from an existing manhole by which method a concrete invert built on the bottom of an existing manhole can be removed safely and quickly at low cost. <P>SOLUTION: A rod 5 fitted with a cutting bit 6 is lowered from an opening 16 to face the upper surface of an invert 15, and the rod 5 is further lowered as the arm 41 of a boring machine 4 is rotated to cause the bit 6 to cut the invert 15. The rod 5 is then lifted up, and the boring machine 4 is moved to change a position to be cut by the cutting bit 6 to carry out cutting work at a plurality of places. Subsequently, the rod 5 is pulled out of a manhole A, and then a small lump of the invert 15 at the bottom of the manhole A is carried out of the opening 16 to remove the invert 15 from the existing manhole A. In this manner, the concrete invert 15 built on the bottom of the existing manhole A is removed safely and quickly at low cost. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an invert removal method for an existing manhole, which removes a concrete invert built on the bottom of an existing manhole.

  In order to cope with the height difference and angle between the inflow conduit and the outflow conduit, a concrete invert is usually built at the bottom of the manhole (see Patent Document 1).

However, it is necessary to remove the invert from the bottom of the manhole when performing seismic retrofitting work that softly connects each pipeline and the manhole.
This operation is usually performed by the following method.
An operator enters the manhole, impacts the invert using a power tool (breaker, hammer drill) or compressor, breaks it down, and removes the debris.

JP-A-8-86009

The above-mentioned human work causes the following problems.
The work takes a long time and causes an increase in cost.
Vibration and noise are great, causing inconvenience to nearby residents.
Dust and dust are generated and workers lose their health.
Spattered debris enters the pipeline and flows downstream, or the pipeline is blocked.

  An object of the present invention is to provide an invert removal method for an existing manhole that can remove a concrete invert built at the bottom of an existing manhole safely and quickly at a low cost.

(About claim 1)
The concrete invert built at the bottom of the existing manhole is removed through the following steps.

  Remove the lid of the existing manhole buried in the ground from the manhole opening, and movably install the boring machine with the arm on the ground surface near the opening (boring machine installation process).

A cutting bit is attached to the tip of the rod on the ground surface near the manhole opening (bit attaching process).
The rod with the cutting bit attached is lowered into the manhole from the manhole opening, and the cutting bit is allowed to face the top surface of the concrete invert laid on the bottom of the manhole (rod lowering process).
The base end of the rod is fixed to the chuck of the boring machine (rod fixing process).

  The boring machine is operated, the rod is lowered while rotating, and the invert is cut with a cutting bit. When this cutting is completed, the rod to which the cutting bit is attached is raised above the upper surface of the invert, and then the boring machine is moved to change the cutting position with the cutting bit. Next, the rod attached with the cutting bit is lowered while rotating, and the invert is cut at the changed position (invert cutting step).

After the rod attached with the cutting bit is pulled out of the manhole, the inverted small lump at the bottom of the manhole is carried out from the opening of the manhole (small lump unloading step).

  Since the worker does not need to enter the manhole except when the invert blob at the bottom of the manhole is carried out from the manhole opening, the worker is safe and does not impair health.

  The existing manhole invert removal method uses a boring machine to cut the invert with a rod fitted with a cutting bit to make an invert lump, thus reducing work time and reducing costs compared to manual work. Can do. Further, since the invert is not crushed and is divided into small chunks, it is possible to prevent the invert debris from being scattered.

  The invert removal method for existing manholes generates less vibration and noise than methods that use electric tools and compressors.

(About claim 2)
The cutting bit attached to the tip of the rod is cylindrical and has a cutting blade formed at the tip. Then, the cutting position is changed so that the cutting parts overlap, and the cutting bit cuts a plurality of places of the invert.

  Since the invert is divided into small chunks of the size of the cylindrical surface of the cutting bit, after the rod with the cutting bit attached is pulled out of the manhole, the invert small chunk at the bottom of the manhole can be easily carried out from the manhole opening. Can do.

It is explanatory drawing which shows the place which removes a metal cover from opening of the existing manhole. It is explanatory drawing which shows the place which drops the rod which attached the cutting bit in the opening manhole. It is explanatory drawing which shows the place which drops while rotating a rod and cuts invert with a cutting bit. It is explanatory drawing which shows the place which changes a cutting position so that a cutting site | part overlaps and a cutting bit cuts several places of invert. It is explanatory drawing which shows the state by which the invert small block was subdivided into the small block by cutting of the several places of invert.

  Remove the metal lid of the existing manhole embedded in the ground from the manhole opening, install the boring machine with the arm on the ground near the opening (boring machine installation process), and attach the cylindrical cutting bit to the tip of the rod (bit attachment) Process), the rod is lowered from the opening of the manhole, the cutting bit is placed on the upper surface of the concrete invert built on the bottom of the manhole (rod lowering process), and the base end of the rod is fixed to the chuck of the boring machine (rod fixing) Process), the boring machine is operated, the rod is lowered while rotating, the invert is cut into a cylindrical shape with a cutting bit, the rod is lifted when the cutting is completed, and the cutting position of the cutting bit is changed by moving the boring machine Cutting at multiple locations (invert cutting process) and mounting cutting bits After removing the rod from the manhole, by the invert nodules manhole bottom unloading from the manhole opening (blobs unloading step), to remove the invert of existing manholes.

  Since the worker does not need to enter the manhole except when the invert blob at the bottom of the manhole is carried out from the manhole opening, the worker is safe and does not impair health.

  The invert removal method for existing manholes is a method that uses a boring machine to cut the invert with a rod attached with a cutting bit and carry it out as an invert lump, so the work time can be significantly reduced compared to the conventional method, Cost can be reduced. Further, since the invert is divided into small blocks and is not crushed, the invert fragments can be prevented from being scattered.

  The invert removal method for existing manholes produces much less vibration and noise than conventional methods using electric tools and compressors.

A first embodiment (corresponding to claims 1 and 2) of the present invention will be described with reference to FIGS.
The existing manhole A shown in FIG. 1 is formed by stacking cylindrical bodies 12, 13, and 14 (made of concrete) on the bottom plate 11, building an invert 15 (made of concrete) on the inner bottom, and penetrating through the wall of the cylindrical body 12. The sewage main pipe 2 on the upstream side and the sewage main pipe 3 (fume pipe) on the downstream side, and a metal lid 17 that closes the opening 16 of the cylindrical body 12 are embedded in the ground.

After stopping the inflow of sewage into the manhole on the upstream side of the sewage main pipe 2, the invert removal of the existing manhole A is performed according to the following procedure.
(1) The metal lid 17 of the existing manhole A is removed from the opening 16, and the boring machine 4 having the arm 41 is movably installed on the ground surface 10 near the opening (boring machine installation step). A boring machine in which the arm 41 can be displaced may be used.

(2) The cylindrical cutting bit 6 is attached to the tip 51 of the rod 5 (made of metal) on the surface 10 near the opening 16 (bit attaching step).
(3) As shown in FIG. 2, the rod 5 to which the cutting bit 6 is attached is lowered into the manhole from the opening 16, and the cutting bit 6 is made to face the upper surface of the concrete invert 15 built on the manhole bottom (rod lowering). Process).

(3) The base end 52 of the rod 5 is fixed to the chuck 42 of the arm 41 of the boring machine 4 (rod fixing step).

(4) As shown in FIG. 3, the boring machine 4 is operated, the arm 41 is lowered, the rod 5 is lowered while rotating the rod 5, and the invert 15 is cut with the cutting bit 6. When this cutting is completed, as shown in FIG. 4, the rod 5 to which the cutting bit 6 is attached is raised above the upper surface of the invert 15, and then the boring machine 4 is moved so that the rod 5 is positioned at the broken line. The position where the cutting bit 6 cuts is changed. Next, the rod 5 attached with the cutting bit 6 is lowered while rotating, and the invert 15 is cut at the changed position (invert cutting step). In addition, as shown in FIG.5 (b), a position change is performed in multiple times.

(5) After the rod 5 with the cutting bit 6 attached is pulled out of the manhole, the invert small lump at the bottom of the manhole is unloaded from the opening 16 (small lump unloading step).

The invert removal method of the existing manhole of Example 1 has the following advantages.
Since the boring machine 4 is used to cut the invert 15 with a rod attached with the cutting bit 6 to carry out the invert into a small lump, the working time can be shortened and the cost can be reduced as compared with the manual work. Further, since the invert is not crushed and is divided into small blocks, it is possible to prevent the fragments of the invert 15 from being scattered.

There is no need for the worker to enter the manhole except when the invert blob at the bottom of the manhole is carried out from the opening 16, so that the safety of the worker can be improved and the health is not impaired. Compared to conventional methods that use electric tools or compressors, vibration and noise are much less likely to occur.
Since the invert is divided into small chunks of the size of the cylindrical surface of the cutting bit, after the rod with the cutting bit attached is pulled out of the manhole, the invert small chunk at the bottom of the manhole can be easily carried out from the manhole opening. Can do.

A Existing manhole 4 Boring machine 5 Rod 6 Cutting bit 15 Invert 16 Opening (manhole opening)
17 Metal lid (lid)
41 Arm 42 Chuck

Claims (2)

A boring machine installation process in which the lid of the existing manhole buried in the ground is removed from the manhole opening and the boring machine having the arm is movably installed on the ground surface near the opening;
A bit attaching process for attaching a cutting bit to the tip of the rod;
A rod lowering step of lowering the rod from the manhole opening and allowing the cutting bit to face the upper surface of a concrete invert laid on the manhole bottom;
A rod fixing step of fixing a base end of the rod to a chuck of the boring machine;
Operate the boring machine, lower the rod while rotating it, cut the invert with the cutting bit, raise the rod when cutting is completed, and move the boring machine to change the cutting position of the cutting bit Invert cutting process to cut at multiple locations
An invert removal method for an existing manhole, comprising: a small lump unloading step of unloading the invert small lump on the bottom of the manhole from the manhole opening after the rod with the cutting bit attached is pulled out of the manhole. The cutting bit attached to the tip of the rod is cylindrical, and a cutting blade is formed at the tip.
By changing the cutting position as the cutting position overlap, the cutting bit of claim 1 you characterized by cutting a plurality of positions of the inverted, inverted method of removing existing manhole.

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