JPH04216720A - Repairing construction for foot rest metal fittings in man-hole, and hole boring device to be used for the construction - Google Patents

Abstract

PURPOSE:To enable a foot rest metal fittings to be repaired handily and quickly by boring a pair of fitting holes through the internal section of a man-hole, to insert the anchor section of the foot rest metal fittings into a fitting hole, and by fixing the anchor section to be opened with a pin to be driven into. CONSTITUTION:A salient bearing means consisting of a salient bearing rod 13 which can be moved forward and backward, and attachments 15, 15 fitted movably on the counter side of the rod 13, and a hole boring device having a pair of drills 16, 16, are set. Then, an obsolete foot rest metal fittings fitted on the side wall of a man-hole is removed, and after that, the hole boring device is suspended to be moved down and is fixed to be saliently supported, at a required position. After that, by the drills 16, through the internal wall of the man-hole, a pair of fitting holes are bored. After that, an anchor section for the foot rest metal fittings with the anchor section set for each foot, to be widened by driving a wedge-shaped pin, is inserted into the fitting holes, and the pin is driven into and the anchor section is widened, and the foot rest metal fittings is fixed into the fitting holes.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair method for a foothold installed on the side wall of a manhole, and an apparatus used in the drilling step for attaching the foothold in the repair method.

0002

2. Description of the Related Art Manholes are provided for people to enter and exit for inspection and cleaning of sewage pipes, etc. In deep ones, a foothold 2 for lifting and lowering is provided on the side wall as shown in FIG. These footholds are particularly prone to corrosion in pipes where sulfur dioxide gas is generated within the pipes, such as sewage pipes, and it is extremely difficult to use the footholds in manholes, which have been installed for a long time, to go up and down. The situation is dangerous.

[0003] In recent years, it has become necessary to replace these aged footholds, but with conventional construction methods,
After removing the old foothold hardware by cutting it out, drill a hole 1 around it with a breaker or chisel using a drill, etc., as shown in Figure 5, and install a new foothold hardware 2 with mortar or mortar. It was mainly attached using adhesive 3.

0004

[Problem to be Solved by the Invention] In order to attach a foothold hardware, a pair of mounting holes must be drilled at a constant interval, but in the conventional method described above, the pair of mounting holes are positioned one by one. It takes a lot of time to open it, and it also takes a lot of time to fill it with mortar or adhesive to fix the foothold hardware, and it takes a long time for it to harden. Ta.

A first object of the present invention is to provide a simple repair method for foothold hardware, and a second object is to provide a drilling device for use in the method.

[0006]

[Means for Solving the Problems] The repair method of the present invention includes the step of removing the aged foothold hardware, and the step of drilling a pair of mounting holes in the inner wall of the manhole using a drilling device equipped with a pair of drilling machines. Then, use a footrest with an anchor part on each leg that expands by driving a wedge-shaped pin, and insert the anchor part of each leg into the mounting hole, and then drive the pin into the footrest. The method is characterized by comprising the step of fixing the object to the mounting hole.

[0007] The drilling device of the present invention used in the above method is extendable and retractable, and is arranged in parallel at a certain distance with a support means that abuts against the inner wall of the manhole and is supported in a tensioned state. It consists of a drilling machine. Here, the support means may be in point contact with the inner wall of the manhole, but preferably at least one of the left and right contact portions with the inner wall of the manhole has a constant length in the vertical direction. Ru. This restricts the inclination of the device and allows the pair of mounting holes to be drilled horizontally without tilting.

[0008] When drilling into a slanted wall, in order to prevent the device from tilting, it is necessary that the contact portion be inclined with respect to the vertical axis in a plane passing through the vertical axis and be aligned with the slanted wall.

[Operation] According to this method, a pair of holes for attaching the foothold hardware can be simultaneously drilled with one positioning, and then the foothold hardware is fixed by inserting the anchor part into each hole and driving a pin. be done.

[0009] The drilling device is fixed by raising and lowering the support means in a contracted state, and then extending them at a predetermined position so as to abut against the inner wall of the manhole to maintain a tensioned state. Thereafter, a pair of holes for attaching the foothold hardware are formed in the inner wall of the manhole using both drilling machines.

0010

[Example] Figures 1 and 2 show a drilling device.
A pole 12 is horizontally suspended on a frame-shaped bracket 11, and a support rod 13 screwed into the end of the pole can be rotated and moved back and forth by operating a handle 14. A pair of straight wall attachments 15 protruding on the opposite side of the support rod 13 are each removably attached to the bracket 11, and the contact portion of each attachment 15 with the inner wall of the manhole extends vertically and in parallel. It has a wedge-shaped cross section. The attachment 15 described above is for a straight wall, but for an inclined wall, the contact portion is inclined or has a pin shape.
Bracket 11 also includes
A pair of drills 16 are arranged in parallel on both sides, so that a pair of holes for attaching foothold hardware can be formed in the inner wall of the manhole on each side. In the figure, reference numeral 17 denotes a hanging fitting fixed to the bracket 11, which is connected to a rope or wire connected to a lifting device (not shown) and is used to raise and lower the drilling device.

FIG. 3 shows a foothold hardware 18, which has an anchor part 19 configured to be expandable by a split groove on each leg of different length, and into which a pointed pin 20 can be driven. This causes the anchor portion 19 to expand as shown by the dashed line in the figure. When repairing foothold hardware, first remove the worn-out foothold hardware by cutting it out as usual. Next, the drilling device with the attachment 15 attached according to the shape of the inner wall of the manhole at the drilling location is lowered to a predetermined position by a rope connected to the hanging fitting 17 using a lifting device, and the support rod 1 is lifted by rotating the handle 14.
3 is made to protrude and abut against the inner wall of the manhole, and is supported in a stretched state. Next, a pair of drills 16 are used to drill into the inner wall of the manhole. After that, the support rod 13 is retracted by operating the handle, the drilling device is moved to the next drilling location, and both anchor parts 19 of the foothold hardware 18 are inserted into the drilling hole, and each pin 20 is driven in to secure the anchor part 19 to the hole. Expand and fix inside.

Before driving the pin 20, resin or cement milk or the like may be injected into the hole of the foothold hardware 18 through which the pin 20 is passed. This has the effect of preventing rust of reinforcing bars and the like inside the concrete of the inner wall of the manhole, and also has the effect of stopping water when the hole drilled with the drill 16 penetrates the inner wall. Repairs to the foothold hardware are carried out in sequence in the manner described above.

[0013]

[Effects of the Invention] According to the drilling device of the present invention, a pair of holes for installing a new foothold after removing an old foothold can be positioned once without having to individually position them. The holes can be drilled at the same time, making the drilling work simple and quick. Furthermore, according to the method of the present invention, the foothold hardware can be easily and quickly repaired by driving a pin, and therefore, the foothold hardware can be repaired more simply and quickly than in the conventional method. In addition, in the drilling device, if the portion of the support means that contacts the inner wall of the manhole has a certain length vertically, the inclination of the drilling device is regulated and the pair of mounting holes can be drilled horizontally. .

[Brief explanation of the drawing]

FIG. 1 is a plan view of a punching device.

FIG. 2 is a front view of the punching device.

FIG. 3 is a partially sectional front view of the footrest.

FIG. 4 is a cross-sectional view of the manhole.

FIG. 5 is a diagram showing a conventional repair method.

[Explanation of symbols]

Claims (3)

[Claims] [Claim 1] A step of removing aged foothold hardware;
The process involves drilling a pair of mounting holes in the inner wall of the manhole using a drilling device equipped with a pair of drilling machines, and creating a foothold fixture with an anchor part on each leg that expands by driving a wedge-shaped pin. A method for repairing foothold fittings for manholes, which comprises the steps of: inserting the anchor parts of each leg into the mounting holes, and then fixing the foothold fittings in the mounting holes by driving pins. Claim 2: A drilling device for forming a pair of holes for attaching foothold hardware in the inner wall of a manhole, the device comprising a support means that is extendable and retractable and abuts against the inner wall of the manhole and is supported in a taut state. A perforation device consisting of a perforation machine and a perforation machine installed in parallel at a certain interval. 3. The drilling device according to claim 2, wherein at least one of left and right contact portions of the supporting means with the inner wall of the manhole has a constant length in the vertical direction.