JP2006057390A - Simple centering device for earthquake-resistant construction method for pipe body connected to underground buried structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a simple centering device for a refurbishing method for obtaining an earthquake-resistance which has a substantially simplified structure, facilitates its delivery into/from an underground structure like a manhole and its assembling/disassembling inside the structure, and accepts a chain-saw-type concrete cutter for use as a cutting tool. <P>SOLUTION: When refurbishing a connection of an existing manhole B, to which a pipe body C is connected and fixed by means of a rigid structure, to obtain an earthquake-resistant joint structure, the centering device is used to cut off, from the inside, a wall surface B-1 of the manhole B around the pipe body C using the cutting tool 4 to form a ring-like hole D. The centering device is formed to be substantially cylindrical and smaller than an inner diameter of the pipe body C. The centering device comprises a main body 1 having pressure-contact fixing means 7 at several places in the peripheral direction to be in pressure-contact with the inner surface of the pipe body C, a strut 2 fitted to a shaft center of the main body 1 along the line extended from a pipe axis X of the pipe body C, and an arm member 3 fitted to the strut 2. The arm member 3 is formed in a manner that the cutting tool 4 is movable back and forth in the direction of the cutting position and is rotatably supported. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a connecting portion between an existing underground buried structure and a pipe body, in which a pipe body constituting a water conduit is connected with a rigid structure to a wall portion of a concrete underground buried structure, When remodeling to an earthquake-resistant connection structure that can withstand horizontal movement (extraction direction, thrust direction, etc.) and bending in the event of an earthquake, a part of the structure side wall around the tube body is cut out using a cutting tool and the surrounding area is circular The present invention relates to a simple centering device used for making a hole.

  In recent years, for example, the seismicization (flexibility) of the connecting part between an existing manhole, which is one of concrete underground buried structures with an entrance built and buried underground, and a pipe connected to this with a rigid structure has been made. There are ongoing seismic retrofitting work that can withstand bending, horizontal movement in the direction of pulling out and thrusting in the event of an earthquake, and bending.

  And, as a seismic retrofitting method to renovate the connection part between the existing manhole and the tube connected to it with a rigid structure to the seismic connection structure, by cutting the wall surface of the manhole around the tube, A construction method is generally performed in which an annular hole that is substantially concentric with the tube core of the body is drilled around the tube body, and an elastically deformable earthquake-resistant joint member is attached to the annular hole (space portion). .

  By the way, in order to cut the wall surface of the manhole around the tube, all that is necessary is to follow the circumferential track line along the drilling radius circumferential track line that is as close as possible to the hole diameter that should be opened around the tube core of the tube body. It is important in the repair work to form a notch such as a drill hole or a cutter hole (slit) continuous with the pipe core in a state (hole shape) that is substantially concentric with the tube core.

Therefore, conventionally, a drilling device that uses the inside of the tube to determine the center of the perforating radius circumferential track and puts a cutting line (hole) that is substantially concentric with the tube core into the wall surface of the manhole around the tube is the first. It has been proposed (Patent Document 1).
That is, the conventional device described in Patent Document 1 operates the link mechanism of the mounting portion to be inserted into the pipe body by air or hydraulic pressure, so that the fixing plate provided in the link mechanism is arranged in the circumferential direction of the pipe body. It is configured to perform center positioning of the drilling radius circumferential trajectory with a cutting tool via a post attached to the mounting part along the tube core extension line of the pipe body and a turning part attached to this post. ing.

  In another embodiment, by operating an air or hydraulic cylinder projecting radially from the outer periphery of the main body to which the support column is attached, the contact plate provided on the cylinder rod is attached to the inner periphery of the tube body. It is configured so that the center position of the circumferential track of the drilling radius by the cutting tool can be determined fairly accurately by crimping in several directions.

However, since the conventional device uses air or hydraulic pressure as a working medium, an air or hydraulic device for that purpose is required, and the weight of the device increases, so that its transportation and installation, and air or hydraulic pressure are required. Not only does it take time and effort to prepare and set up the piping for the halls, but it also increases costs.
In addition, the air or hydraulic hose carried in the narrow manhole becomes an obstacle, affecting the drilling work by the cutting tool, and requires a great deal of labor to form an annular hole around the tube, It was not realistic and practical application was difficult.

Moreover, since there exists a possibility that a hose may be cut | disconnected accidentally during a drilling operation | work, in a conventional apparatus, cutting tools, such as a core drill, must be selected.
Therefore, it is necessary to repeat the work of opening countless holes with a drill diameter along the perforation radius circumference track line on the wall surface of the manhole around the tube body, and the work efficiency such as time and labor is extremely poor. The labor given to the workers has also been tremendous.
That is, the conventional apparatus cannot use a chainsaw-type concrete cutting machine that can efficiently perform a cutting line having a predetermined length along the perforation radius circumferential track line.

In addition, the conventional device has a complicated structure such as the swivel part including the mounting part inserted into the tube and has a large number of parts, so it tends to be heavy, and it is hard to carry in and out from the narrow entrance / exit of the manhole. become.
In other words, since the opening diameter (inner diameter) of the most common manhole in Japan is 600 mm, in order to carry in and out heavy conventional equipment through such a small diameter entrance, a lifting device such as a heavy machine must be installed. There was a need to suspend and lift it.
Furthermore, since the structure of the conventional apparatus is complicated, it has been troublesome and time-consuming to assemble and disassemble the swivel unit after being carried into the manhole.

JP 2002-227226 A

  The problem to be solved by the present invention is that the structure is greatly simplified, it is easy to carry in / out through the entrance / exit of the underground structure, and to be assembled / disassembled in the structure, and also to cut the chainsaw type concrete cutting machine An object of the present invention is to provide a simple centering device in a seismic retrofit method that can be used as a tool.

In order to solve the above problems, according to the present invention, in claim 1, an existing underground burial in which a pipe constituting a water conduit is connected and fixed to a wall surface of a concrete underground buried structure with a rigid structure In the seismic retrofitting method of repairing the connection part of the structure connection pipe body to the seismic joint structure, the wall of the underground buried structure around the pipe body is excised from the inside of the structure by using a cutting tool. A simple centering device that forms an annular hole substantially concentric with the tube core of the tube around the body,
It is formed into a substantially cylindrical shape with a required length with an outer diameter smaller than the inner diameter of the above-mentioned tube body. A main body provided with various pressure contact fixing means,
A column that is detachably attached to the axis of the main body along the tube core extension line of the tube,
The arm member is configured to be slidable and rotatable along the support column.
The arm member is formed so as to attach and support the cutting tool so as to be movable forward and backward and toward a cutting position on a piercing radial trajectory line of the annular hole centered on the support column. And

And the said main-body part is formed in the cylindrical shape which closed the circumferential surface completely, or the cylindrical shape which connected the circumferential direction several places of the ring cylindrical shape front and rear members with the connection member, It is preferable to have a simple and simple structure in which the support portion for the column is attached via a radial armband. The press contact fixing means provided at several places in the circumferential direction of the main body portion is manually operated by the operator. For example, a bolt such as an adjustment bolt having a manual structure that is moved forward and backward by the above-described method can be used.
Further, as the cutting tool, a chain saw type concrete cutting machine with high work efficiency is preferable because it requires less cutting or cutting amount than a drill type such as a core drill.

  Moreover, in Claim 2, the arm member of Claim 1 is comprised with the slide block attached to the support | pillar so that advancing / retreating and rotation is possible, and the brace provided with the cutter attachment part of a cutting tool, The brace is that it is attached to the slide block in a movable state so that the radius of rotation of the cutting tool with respect to the column can be adjusted.

  Further, according to a third aspect of the present invention, the main body according to the first or second aspect is formed such that a plurality of circumferential directions can be assembled and disassembled. That is, the main body is formed so as to be carried into an underground buried structure such as a manhole in a state where the circumferential direction is divided into a plurality of parts, and to be connected and assembled into a substantially cylindrical shape in the inside.

According to the simple centering device of the present invention, the main body part to be inserted into the tube body and to be crimped and fixed on the substantially concentric core has a substantially cylindrical shape and has several operations in the circumferential direction. By providing pressure contact fixing means for advancing and retreating by a person's manual work, the structure is greatly simplified as compared with the conventional device that is fixed to the inner surface of the tube body by air or hydraulic pressure. As a result, it can be manufactured at low cost. And while it has a simple structure, the centering of the drilling radius circumference track with a cutting tool can be moved to and from this column. And the arm member that is rotatably attached.

  In addition, since the cutting tool is centered without using air or hydraulic pressure, there is no need for troublesome preparation work such as transportation or installation of air or hydraulic equipment and piping. Therefore, the setup before entering the drilling operation can be performed in a simple and short time compared with the conventional apparatus, and the cost of the seismic retrofitting work can be reduced.

  Further, unlike the conventional device, it is not necessary to carry in the pipe into the structure such as air or hydraulic hose which becomes an obstacle to the drilling work, so that a predetermined length of the cutting line can be drawn around the pipe radius. It becomes possible to use a chainsaw-type concrete cutting machine capable of performing a drilling operation while efficiently performing along a line as a cutting tool. As a result, the labor given to workers can be reduced, and at the same time, the earthquake-resistant repair work period can be greatly shortened.

  According to the configuration of the third aspect, it is possible to carry in / out from the entrance / exit of the main body portion formed so as to be disassembled / assembled into a substantially cylindrical shape having an outer diameter smaller than the inner diameter of the tube body.

  The best mode for carrying out the present invention will be described with reference to FIGS.

The drawing shows a connection part in which a tubular body C constituting a water passage pipe and the like is connected and fixed to a wall surface B-1 of an existing manhole B which is one of concrete underground buried structures, by a rigid structure. The seismic retrofitting method for retrofitting seismic joint structures is shown.
FIG. 1 shows an example of an embodiment of a simple centering device A of the present invention, in which 1 is a main body, 2 is a column, 3 is an arm member, and this arm member 3 has a cutting tool, in the illustrated example, a chainsaw type. A concrete cutting machine (hereinafter abbreviated as a cutting machine) 4 is attached and slid back and forth along the column 2 and the arm member 3 that rotates around the column 2 is rotated around the tube C while repeating rotation at a predetermined angle. Drilling radius circumferential trajectory line X- centering on the column 2 (tube core X of tube C) by sequentially pushing and pushing the chain bar 4-1 of the cutting machine 4 into the wall B-1 of the manhole B of A cutting line 5 having a length corresponding to the blade width of the chain bar 4-1 is sequentially cut along the upper side, and a cut portion surrounded by the continuous cutting line 5 is formed around the tube C. To be.

  The main body 1 is formed of a metal material or other material having rigidity, and ring cylindrical front and rear members 1-1, 1- 1 having an outer diameter smaller than the inner diameter of the tube body C and an appropriate width. 2 and the front and rear members 1-1 and 1-2 are arranged in several places in the circumferential direction, and in the example shown in FIG. The front and rear members 1-1 and 1-2 are provided with press-fitting and fixing means 7 which can be moved forward and backward to be pressed against the inner surface of the tube body C after being inserted into the tube body C at several locations in the circumferential direction.

Further, on the inner side of the front and rear members 1-1 and 1-2 on the axial line of the main body 1, an arm member 1 attached radially inward toward the axial direction of the members 1-1 and 1-2. A cylindrical mounting portion 1-4 is fixedly supported via 5, and the support column 2 is fitted and attached to the front and rear mounting portions 1-4 so that the support column 2 is mounted on the axis of the main body 1. It is assembled with a front and rear two-point support structure, and is projected and held in the manhole B along the tube core X extension line of the tube body C at a required length.
In addition, the attachment part 1-4 attached to the rear member 1-2 side (the side inserted into the tube body C back) is configured as a bag-like opening at one end so that one end of the support column 2 is fitted and received, Further, the attachment portion 1-4 is optional, such as one having the same length as the main body portion 1 without being divided into front and rear.

  In the figure, reference numeral 5 denotes support post retaining bolts provided in the front and rear mounting portions 1-4, respectively, and the support post 2 is fastened to the front and rear by tightening the support post 2 after being attached to the front and rear mounting portions 1-4. It is fastened to the mounting part 1-3. In other words, the column 2 can be fastened onto the axial extension line of the main body 1 so as not to be pulled out.

Furthermore, the opening edge of the front member 1-1 of the main body part 1 is provided with a hook-like hooking part 6 that is hooked on the pipe mouth edge of the pipe body C, and the main body part 1 is inserted into the pipe body C. When this occurs, the amount of insertion of the main body 1 into the tube C is regulated.
That is, although illustration is omitted, for example, when the terrain of the place where the manhole B is constructed and buried is inclined, the pipe body C is also obliquely buried according to the inclined terrain and connected to the manhole B. However, when the main body 1 is inserted into the inclined tube C, the amount of insertion of the main body 1 into the tube C is multiplied so that the main body 1 does not enter the depth of the tube C. This is regulated by the part 6.

The pressure contact fixing means 7 is an adjustment bolt 7-1 that is manually advanced and retracted by an operator, and screw holes provided at equal intervals in four circumferential directions of the front and rear members 1-1 and 1-2. Or it is attached to the bolt insertion hole to which the nut is attached, and after the main body portion 1 is inserted into the tube body C, the operator himself turns it with a tool or the like so that the inner circumferential direction of the tube body C is kept at an equal interval. Thus, the main body 1 is fixed in the tube body C in a state of being substantially concentric with the tube core X.
The pressure fixing means 7 is not limited to the adjusting bolt 7-1, and a manual structure that allows the operator to manually advance the protrusion and press it against the inner surface of the tube C, and to retreat and release the pressure contact state. As long as it is, it is arbitrary.

  The support column 2 is made of a hollow or solid cylindrical stainless steel having a smooth surface, and in a state where it is built in and attached to the main body 1, a required length is provided in the manhole B along the tube core extension line of the tube body C. It is formed in a length that projects.

  The arm member 3 is for the slide block 3-1 extrapolated to the column 2, a pair of arm rods 3-2 attached to the block 3-1, and a cutting machine 4 attached to the tip of the arm rod 3-2. And a cutter mounting portion 3-3.

  The slide block 3-1 has a column insertion hole 8 for inserting the column 2, and slides forward and backward in the longitudinal direction along the column 2 by being extrapolated to the column 2, and the column 2 is a fulcrum. To rotate.

The slide block 3-1 has an arm hook insertion hole 9 for inserting the pair of arm hooks 3-2 at a predetermined parallel interval in a direction perpendicular to the opening direction of the column insertion hole 8. It has a pair of arm rods 3-2 so that the pair of arm rods 3-2 can move in a direction perpendicular to the support column 2 so that the turning radius of the cutting machine 4 with respect to the support column 2 can be adjusted. I have to do it.
That is, according to the size of the annular hole (annular gap) D formed around the tubular body C around the support column 2 fixed to the same core via the main body 1 on the tube core X extension line of the tubular body C. By sliding the pair of arm rods 3-2, the chain bar 4-1 of the cutting machine 4 can be adjusted to the perforation radius circumferential track line X-1.

  In the figure, 10 is a set bolt that fastens and fixes the armband 3-2 to the slide block 3-1, and 11 moves (slids) the arm member 3 back and forth with respect to the column 2. Or a handle used when rotating stepwise at an appropriate angle.

The cutter attachment portion 3-3 has a block shape that is attached to the end portions of the pair of armbands 3-2, and an attachment block 12 described later is detachably fixed, so that the cutting machine 4 is attached. I am doing so.
In the figure, reference numeral 13 denotes a snap ring for retaining provided on one end side of the pair of armbands 3-2, and the other end side projected from the cutter mounting portion 3-3 is inserted into a mounting hole 14 described later. It is.

  As is well known, the cutting machine 4 includes a main body 4-3 in which a motor as a prime mover is built, a chain bar 4-1 and a chain 4-2 extending from the main body 4-3 with an appropriate blade width. An attachment block 12 that is detachably attached to the cutter attachment portion 3-3 of the arm member 3 is provided.

  The attachment block 12 has a mounting hole 14 into which the end side of the pair of arm rods 3-2 protruding from the cutter mounting portion 3-3 is inserted, and the arm rod is prevented from moving forward and backward toward the mounting hole 14. Bolts 15 are provided so that they can be attached to the cutter attachment portion 3-3.

Next, the operation procedure for forming the annular hole D in the wall surface B-1 of the manhole B around the tube C by the cutting machine 4 using the centering apparatus A configured as described above will be briefly described. .
First, the main body 1, the column 2, the arm member 3, and the cutting machine 4 are carried into the manhole B from the entrance / exit (not shown) of the existing manhole B. Then, the main body 1 is inserted into the tube body C that forms the annular hole D. At this time, after the main body 1 is inserted until the hanging portion 6 hits the tube mouth edge of the tube C, the main body 1 is fixed in the tube C by turning the adjusting bolts 7 at several positions in the circumferential direction. .

Then, the support column 2 is assembled and mounted across the front and rear mounting portions 1-4 of the main body 1 axis, and the support column 2 is fastened and fixed by tightening the support bolts 5 of the mounting portions 1-4.
Thereafter, the arm member 3 is incorporated into the support column 2 and the cutting machine 4 is attached to the cutter attachment portion 3-3 of the arm member 3 so that the cutting line 5 is formed on the wall surface B-1 of the manhole B around the tubular body C. The setup installation is completed (see Fig. 3).
In addition, when carrying in / out through the doorway is possible, it is possible to attach the support column 2 to the main body 1 in advance and carry it into the manhole B together with the main body 1.

  Next, the arm is positioned at the position where the tip of the chain bar 4-1 of the cutting machine 4 abuts on the size of the annular hole D to be formed, that is, on the perforation radius circumferential track line X-1 centering on the tube core X. Positioning is performed by moving the pair of armbands 3-2 of the member 3 to one of them. When the position has been determined, the arm rod retaining bolt 15 is tightened to fasten and fix the pair of arm rods 3-2 to the slide block 3-1 (see FIG. 4A).

  When the position adjustment of the chain bar 4-1 along the perforation radius circumferential track line X-1 is completed, the motor of the cutting machine 4 is operated and the arm member 3 is moved forward along the column 2 to move the chain. Push bar 4-1 against wall B-1 of manhole B and push. Then, the cutting line 5 having a length corresponding to the blade width of the chain bar 4-1 is cut into the wall surface B-1. When the first cutting line 5 is cut, the arm member 3 is moved backward along the support column 2, the chain bar 4-1 is pulled away from the wall surface B-1, and the arm member 3 is turned by a predetermined angle to move the wall surface B-1 The arm member 3 is moved forward again by changing the cutting position with respect to, and the tip of the chain bar 4-1 follows the perforated radius circumferential track line X-1 so as to be adjacent to the previously cut line 5 The new cutting line 5 is cut by pushing against the wall surface B-1 (see FIGS. 4B and 4C).

  Thereafter, the cutting line 5 is sequentially cut by the cutting machine 4 into the wall surface B-1 of the manhole B around the tube C while repeating the advancement and retreat of the arm member 3 along the support column 2 and the rotation at a predetermined angle. A cut portion surrounded by a polygonal shape close to a circle is formed around the tubular body C by a cutting line 5 extending along the radial circumferential track line X-1 (see FIG. 5).

  By removing the excised portion surrounded by the cutting line 5 and formed around the tube C, an annular hole (annular gap) D is formed around the tube C. C and manhole B are cut off (see FIG. 6A).

  The seismic retrofit work between the wall B-1 of the existing manhole B and the tubular body C is completed by attaching the earthquake-resistant joint unit 16 to the annular hole D formed around the tubular body C by the above-described cutting operation. .

The seismic joint unit 16 has various forms and is not particularly limited. However, if one example is given, it is larger than the outer diameter of the tube C and fits in the annular hole D. An annular metal sleeve 16-1 and an elastically deformable flexible rubber tube 16-2 that can be folded back in the coaxial direction by being pushed in the axial direction.
In addition, the construction procedure which attaches this earthquake-resistant joint unit to the cyclic | annular hole D can use what is indicated by Unexamined-Japanese-Patent No. 2003-105788, Unexamined-Japanese-Patent No. 2003-232048, etc. by this applicant.

That is, as an example, as shown in FIG. 6, one end side of the rubber tube 16-2 is fitted and fixed to the outside of the tube port of the tube body C with the fastening band 17, and the other tube 16-2 is connected. The end side is fitted and fixed to the outside of the metal sleeve 16-1 with the fastening band 18.
Thereafter, the sleeve 16-1 is pushed between the outer peripheral surface of the tubular body C and the inner peripheral surface of the annular hole D, and the rubber tube 16-2 is folded in the axial direction and reversed. Between the inner peripheral surface of the hole D and the outer peripheral surface of the metal sleeve 16-1, a connecting material 19 made of resin-based sealing material, mortar, resin-based mortar, or the like is injected and filled, and the outer periphery of the sleeve 16-1 The surface is connected and fixed to the inner peripheral surface of the annular hole D.
Then, between the inner peripheral surface of the sleeve 16-1 and the outer peripheral surface of the tube port of the tube body C, a cushioning material 20 made of foamed urethane or polystyrene foam is injected and filled, and the inner peripheral surface of the sleeve 16-1 is piped. It is connected and fixed to the outer peripheral surface of the tube opening of the body C.

As shown in FIG. 7, a plurality of receiving members 21 are provided at equal intervals on a fastening band 18 for fitting and fixing the other end of the rubber tube 16-2 to the outside of the metal sleeve 16-1. As described above, after the metal ring 16-1 is pushed between the outer peripheral surface of the tubular body C and the inner peripheral surface of the annular hole D so that the rubber tube 16-2 is folded and inverted in the axial direction as described above, After loading and setting the closing body 22 made of a sponge or rubber-like member formed in a ring shape with a size that closes the space between the outer peripheral surface of the ring 16-1 and the inner peripheral surface of the annular hole D, it was described above. As described above, it is preferable to inject and fill the connecting material 19 between the inner peripheral surface of the annular hole D and the outer peripheral surface of the metal sleeve 16-1.
That is, when a gap or a cavity is formed outside the manhole B, there is a possibility that the injected connecting agent 19 flows out into the gap or the cavity and cannot be reliably filled. In order to make it easy and reliable, the closing member 22 is loaded and set between the inner peripheral surface of the annular hole D and the outer peripheral surface of the metal sleeve 16-1, and the connecting material 19 is filled. It becomes suitable.

Further, during the series of seismic retrofit work for attaching the earthquake-resistant joint unit 16 to the annular hole D from the above-described cutting operation of forming the annular hole D around the tube C, as shown in FIGS. Further, a lid 23 is attached to the main body 1 of the centering device A of the present invention by screwing or the like, and the lid of the tubular body C is closed on the entire surface or only on the lower half side by the lid 23.
Then, one end side of the bellows flexible hose 25 or the like is connected to the connection port 24 provided in the lid body 23, and the other end side of the hose 25 is inserted into the downstream pipe C-1. By providing the drainage bypass connecting the upstream pipe C and the downstream pipe C-1 in the manhole B, there is no need to stop running water such as sewage during the seismic retrofit work. As a result, the setup effort before the earthquake-resistant repair work such as stopping running water such as sewage is reduced.

FIG. 10 shows another embodiment of the simple centering device A-1 according to the present invention. In the second embodiment, the main body 1 in the first embodiment is divided into three parts that can be assembled and disassembled in the circumferential direction. Therefore, it is possible to carry in and out of the manhole B through the doorway B-2 more easily.
In the second embodiment, as shown in the figure, the components other than the main body 100 that can be assembled and disassembled are basically the same as those in the first embodiment. The redundant explanation is omitted by using.

  The main body 100 has a required length with an outer diameter smaller than the inner diameter of the tubular body C by connecting the divided bodies 101 to 103 having a substantially sector shape divided into three in the circumferential direction with bolts and nuts 26. It is formed in a cylindrical shape.

Each of the divided bodies 101 to 103 includes arc-shaped front and rear members 1-10 and 1-20 that are divided into three in the circumferential direction, and a continuous member 1-30 that continuously connects the front and rear members 1-10 and 1-20. An arm member 1-50 attached inwardly toward the axial center of the main body 100 from the arc-divided edges of the front and rear members 1-10, 1-20, and an end of the arm member 1-50 An arcuate mounting member 1-40, which is attached in three parts, is formed into a substantially fan shape.
That is, as shown in FIG. 10 (b), the arm members 1-40 of the divided bodies 101 to 103 that are adjacent to each other are attached and detached with the bolt nut 23 while combining the divided bodies 101 to 103 in the circumferential direction. By freely connecting, the main body portion 100 is configured to be assembled and disassembled in the circumferential direction.

  In the figure, 27 is a bolt connection hole provided in each arm member 1-40 of each divided body 101-103 so that when the divided bodies 101-103 are combined and abutted in the circumferential direction, they are adapted to communicate with each other. It is.

  Note that the main body 100 is not limited to three divisions, and may be divided into four to six according to the size of the main body 100.

Next, how to use the simple centering apparatus A-1 having the above-configured divided type main body 100 will be briefly described.
The divided bodies 101 to 103 are individually carried into the manhole B from the doorway. Then, the arm members 1-40 of the respective divided bodies 101 to 103 which are brought into contact with each other while being combined in the circumferential direction are connected by the bolt nut 26 while the divided bodies 101 to 103 carried into the manhole B are combined in the circumferential direction. A substantially cylindrical body 100 is assembled. At this time, the bolts 2 are sandwiched between the mounting members 1-50 formed in a substantially cylindrical shape and attached to the inner sides of the front and rear members 1-10, 1-20 via arm members 1-40. The divided bodies 101 to 103 may be connected by the nut 23.

  Thereafter, as in Example 1 described above, the main body portion 100 combined in a cylindrical shape is inserted into the tube body C until the hook portion 6 abuts against the tube mouth edge of the tube body C, and then the adjustment bolt 7-1. Is turned to fix the main body part 100 in the tube body C, and assemble the centering device A-1 by a procedure such as incorporating the arm member 3 into the support column 2 so that the wall surface B of the manhole B around the tube body C is obtained. The setup for setting the cutting line 5 to -1 is completed.

  Then, as in the first embodiment, a cut portion surrounded by the cutting line 5 is formed around the tube body C, and an annular hole (around the tube body C is formed by removing the cut portion. After completing a series of seismic retrofitting work between the wall B-1 of the existing manhole B and the pipe C until the seismic joint unit 16 is attached to the annular gap) D, the cutting machine 4, arm member 3, and column 2 is detached and separated, and the crimping state of the adjusting bolt 7-1 on the inner surface of the tube C is released, and the main body 100 is pulled out from the tube C and divided into three parts. Unload from Manhole B individually.

  Therefore, according to the centering device A-1 composed of the split-type main body 100, it is easier to carry in and out the manhole B, and the outer diameter is the opening diameter of the entrance / exit of the manhole B (manhole cover diameter). This is particularly effective at seismic retrofitting sites that are larger than

  In Examples 1 and 2 described above, the earthquake-resistant repair work at the connection portion of the rigid structure between the existing manhole B and the pipe body C has been described. And large underground structures such as treatment tanks.

  Moreover, in the concrete Example of this invention, it is not limited to each above-mentioned Example 1-2 structure, In the range which does not exempt from the summary of Claims 1-3, it changes variously. Is something that can be done.

The exploded perspective view which shows an example of embodiment of the simple centering apparatus of this invention The perspective view which shows the attachment relationship of the cutting machine with respect to the cutter attachment part of an arm member Side view showing the state of completion of setup in which a column and an arm member are assembled and attached to the main body of the centering device attached and fixed in the tube, and a cutting tool is attached to the cutter attachment portion of the arm member. The perspective view for demonstrating the positional relationship of the cutting bar formed with the chain bar of a cutting machine The rear view which shows the state in which the excised part surrounded by the polygon close | similar to a circle was formed in the manhole wall surface around a pipe body by the cutting line continuing along a perforation radius circumference track line Explanatory drawing which shows construction procedure to attach earthquake-resistant joint unit to annular hole The other implementation example which attaches an earthquake-resistant joint unit to a cyclic | annular hole is shown, (a) is an expanded longitudinal cross-sectional view of the principal part, (b) is the isolation | separation perspective view which showed the one part This is a side view showing the bypass structure for stopping the flow of sewage, etc. flowing through the pipelines constructed in the ground when performing a series of earthquake-proof repair work, and shows the main part in cross-section. The exploded perspective view of the principal part The disassembled perspective view which shows other embodiment of the main-body part which comprises the simple centering apparatus of this invention.

Explanation of symbols

A, A-1: Simple centering device 1,100: Main unit 2: Support column 3: Arm member
3-1: Slide block 3-2: Armband
3-3: Cutter mounting part 4: Cutting machine (cutting tool)
7: Pressure contact fixing means 101-103: Divided body B: Manhole B-1: Wall surface C: Tube D: Annular hole

Claims (3)

Renovate the connection part of the existing underground buried structure connection pipe to the seismic joint structure in which the pipe constituting the water conduit is fixed with a rigid structure on the wall surface of the concrete underground buried structure In the earthquake resistance method,
The wall surface of the underground buried structure around the tube body is cut out from the inside of the structure using a cutting tool to form an annular hole around the tube body that is almost concentric with the tube core of the tube body. A simple centering device that performs
It is formed in a substantially cylindrical shape with a required length with an outer diameter smaller than the inner diameter of the tube body, and can be moved forward and backward by being inserted into the tube body at several locations in the circumferential direction and then abutting against the inner surface of the tube body A main body provided with various pressure contact fixing means,
A column attached to the axis of the main body along the tube core extension line of the tube,
The arm member is configured to be slidable and rotatable along the support column.
The arm member is formed so as to attach and support the cutting tool so as to be movable forward and backward and toward a cutting position of the annular hole centering on the support column on a perimeter radius track line. A simple centering device for seismic retrofitting of underground buried structure connection pipes. The arm member according to claim 1 is configured by a slide block that is attached to a support column so as to be movable back and forth and to be rotatable, and an armband provided with a cutter attachment portion of a cutting tool.
The arm brace is attached to the slide block so as to be movable so that the radius of rotation of the cutting tool with respect to the column can be adjusted. The simple core in the earthquake-resistant construction method of the underground buried structure connecting pipe body Ejecting device.   3. The simple centering device in an earthquake-resistant construction method for underground buried structure connecting pipes according to claim 1, wherein the main body is formed so that a plurality of circumferential directions can be assembled and disassembled.

Images