JP2021059862A - Seismic structure for manhole, construction method thereof, and cutting device used to implement construction method - Google Patents

Abstract

To provide a seismic structure for a manhole with an outer sub-pipe connected to a sewer main pipe, a construction method thereof, and a cutting device used to implement the construction method.SOLUTION: A seismic structure for a manhole comprises: an annular groove of an outer sub-pipe; an elastically deformable water blocking material that fills the groove and a space connected to it; an annular hole in a wall of the manhole; and a waterproof material that fills the annular hole. A construction method for the seismic structure comprises the steps of: forming the annular groove in the outer sub-pipe; filling a space below the groove with filling; placing the waterproof material to fill the annular groove and the space connected to it; filling a space above the annular groove with filling; making the annular hole in the wall of the manhole; placing the waterproof material in the annular hole; and installing an inner sub-pipe. A cutting device comprises a leg member, a rod supported by both leg members, a shaft attached to the rod, a motor fixed to the shaft, and a concrete cutter attached to the motor.SELECTED DRAWING: Figure 6

Description

The present invention relates to seismic structures applied to existing manholes to which sewer mains and external subpipes are connected, construction methods thereof, and cutting devices used to carry out construction methods.

Conventionally, in order to make existing manholes earthquake-resistant, it has been proposed to apply a flexible treatment between the manhole and the sewer main which is connected to the manhole. In this flexible treatment, a concrete core cutter is used to make an annular hole around the end of the sewer main on the wall (framework) of the manhole, and an elastically deformable water blocking material is placed in this hole. Is done by. According to this, the restraint of the end of the sewer main by the manhole is released, and the relative displacement of the sewer main with respect to the manhole is allowed through the elastic deformation of the water blocking material in the event of an earthquake. Damage and destruction of pipes are prevented.

By the way, in a manhole in which a plurality of sewer mains having different height positions are connected, an outer sub-pipe may be connected to the sewer mains at an upper height position. In such a manhole, the outer sub-pipe that is connected to and restrains the sewer main main inhibits the relative displacement of the sewer main that has been subjected to the flexible treatment. This is an obstacle to prevent damage or destruction of the sewer mains during an earthquake.

JP-A-2002-30686

An object of the present invention is to provide a seismic structure of a manhole in which an outer subpipe is connected to a sewer main, a method for constructing the manhole, and a cutting device for carrying out the construction method.

The present invention relates to a seismic structure of the manhole in which the sewer main is connected to the wall of an existing manhole at its end and the outer subpipe is connected to the sewer main at its end. The seismic structure of the manhole includes an annular hole formed on the wall of the manhole and surrounding the end of the sewer main, an elastically deformable water blocking material that fills the annular hole, and an outer subpipe. Elastically deformable to fill the annular groove formed in the outer subtube and open to the inside in the vicinity of the end, and to fill the annular groove or the inside of the outer subtube surrounded by the annular groove. It is equipped with a water blocking material.

In the seismic structure of the manhole according to the present invention, at the time of an earthquake, the end portion of the sewer main to the manhole due to the elastic deformation of the annular hole formed in the wall of the manhole and the water blocking material in the hole. Relative displacement is allowed. On the other hand, the restraint of the outer sub-pipe to the sewer main is released by destroying the formed portion of the groove formed in the outer sub-pipe and forming a structural weakness having low mechanical strength by receiving an earthquake force. The relative displacement of the sewer main to the outer sub-pipe is allowed through the elastic deformation of the water blocking material in the groove. This prevents damage or destruction of the sewer main or the manhole due to the occurrence of an earthquake.

The present invention also relates to a method of constructing a seismic structure of a manhole and has two embodiments.

The construction method according to one embodiment is to form an annular groove open to the inside of the outer sub-pipe from the inside of the manhole and the sewer main in the vicinity of the end of the outer sub-pipe. An elastically deformable water blocking material that fills the groove is placed, and before or after the formation of the annular groove, the inside of the manhole surrounds the wall of the manhole around the end of the sewer main. It includes forming an annular hole and arranging an elastically deformable water blocking material that fills the annular hole.

Further, in the method for constructing a seismic structure according to another embodiment, an annular groove is formed in the outer subpipe from the inside of the manhole and the sewer main to open to the inside in the vicinity of the end of the outer subpipe. That, the inside of the outer sub-pipe is filled with a filling under the annular groove, and the elastically deformable water blocking material that fills the annular groove and the inside of the outer sub-pipe surrounded by the groove is provided. Placement, filling the inside of the outer sub-pipe with a filling above the annular groove, prior to or after the formation of the annular groove, on the wall of the manhole around the end of the sewer main. Includes forming an annular hole surrounding the annular hole, arranging an elastically deformable water blocking material to fill the annular hole, and providing an internal subpipe inside the manhole.

In each of the above-mentioned one and other embodiments, the annular groove, which is the arrangement space of the elastically deformable water blocking material, opens inside the outer sub-pipe and does not communicate with the ground outside the outer sub-pipe. During the construction of the seismic structure, the inflow of earth and sand and groundwater into the outer sub-pipe is prevented. Further, since the formation of the annular groove is performed from inside the sewer main, the time and labor required for constructing the seismic structure can be reduced as compared with the case where the ground is excavated from the outside of the manhole. Can be planned.

Further, according to the construction method according to the first embodiment, the outer subpipe can be used after the construction of the seismic structure in the manhole, and the construction method according to the other embodiment can be used. According to this, it is possible to fill the inside of the outer sub-pipe with a filler such as mortar, thereby disposing of the outer sub-pipe and using a newly provided inner sub-pipe.

The present invention further relates to a cutting device. In the construction method according to the one or other embodiment, this cutting device provides an annular groove that opens from the inside of the manhole and the sewer main to the inside of the outer subpipe near the end of the outer subpipe. Used to form.

The cutting device is a rod having a pair of leg members, one end and the other end, and a rod attached to both leg members so as to be slidable in the longitudinal direction thereof, and a shaft, which is rotatable around its axis. A shaft attached to one end of the rod, a motor fixed to the shaft whose rotation axis extends parallel to the axis of the shaft, and a rotation axis of the motor on the axis of the rotation axis. It is equipped with a concrete cutter consisting of a multi-stage round blade that is rotatably attached around it. Upon forming the annular groove, the rod is supported in the sewer main in parallel with the axis of the sewer main via both leg members, and the concrete cutter is supported via the rod in the outer sub pipe. It is suspended in the vicinity of the end of the outer sub-pipe.

The formation of the annular groove in the outer subpipe using the cutting device can be performed as follows.

First, the rod is supported in the sewer main via both leg members. At this time, the concrete cutter is kept inserted inside the outer subpipe. After that, the rod is slid from the other end toward one end thereof, and for example, the rotation axis of the motor is positioned on the axis of the outer subtube. Next, after operating the motor to drive and rotate the concrete cutter, the rod is further slid so as to position the shaft on the axis of the outer subpipe. During this time, the round blade of the concrete cutter in the driven and rotated state moves toward the inner peripheral surface of the outer subpipe, and then bites into the inner peripheral surface, exerting a cutting action on the inner peripheral surface. After that, a hand is inserted from the inside of the manhole into the inside of the sewer main, and the shaft is rotated once around the axis of the outer sub pipe by using a tool such as a wrench. As the shaft rotates, the concrete cutter moves eccentrically around the shaft together with the motor. As a result, an annular groove, which is a cutting mark of the concrete cutter, is formed on the inner peripheral surface of the outer subpipe.

The cutting device preferably further includes a first positioning member that positions the concrete cutter inside the outer subpipe. The first positioning member may consist of a cylindrical frame that is arranged between the leg members and that is attached to the leg members and can be fitted to the outer subtube. According to this, the concrete cutter can be positioned in the outer sub-pipe by fitting the frame to the end of the outer sub-pipe.

The cutting device preferably further includes a second positioning member that positions the shaft on the axis of the outer subtube. The second positioning member may consist of a protrusion provided at one end of the rod and located between the leg members. According to this, the rod is further slid with respect to both leg members from the other end toward one end thereof, and the protrusion is pressed against one leg member to bring the shaft on the axis of the outer subtube. Can be located in.

In the cutting device, the rod may have a handle attached to another end. The handle facilitates the operation of the rod.

It is a schematic cross-sectional view of an existing manhole to which the present invention is applied, and the manhole is in a state before the seismic structure is applied. It is a schematic cross-sectional view of a manhole showing a state in which an annular groove is provided in the outer subpipe for construction of a seismic structure, and the open space at the end (lower end) of the outer subpipe is closed. FIG. 5 is a schematic cross-sectional view of a manhole showing a state in which a filling is filled in an outer sub-pipe below an annular groove for construction of a seismic structure. It is a schematic cross-sectional view of a manhole showing a state in which a water blocking material is arranged in an annular groove of an outer subpipe for construction of an seismic structure. FIG. 5 is a schematic cross-sectional view of a manhole showing a state in which a filling is filled in an outer sub-pipe above an annular groove for construction of a seismic structure, and an annular hole is formed in the wall of the manhole. It is a schematic cross-sectional view of a manhole in a state where an earthquake-resistant structure is applied. It is a front view of the cutting apparatus used for forming an annular groove in an outer subpipe. It is a top view of the cutting apparatus. It is a left side view of a cutting device. It is a schematic cross-sectional view of a manhole which shows the state which the cutting apparatus is carried into the manhole for forming an annular groove in an outer subpipe. FIG. 5 is a schematic partial cross-sectional view of a manhole showing a state in which a cutting device is installed on the end of the outer secondary pipe to form an annular groove in the outer secondary pipe. It is a schematic partial cross-sectional view of a manhole at the start of formation of an annular groove by a cutting device. It is a schematic partial cross-sectional view of a manhole during the formation of an annular groove by a cutting device.

With reference to FIG. 1, the existing manholes to which the present invention is applied are indicated by reference numeral 10 as a whole.

Two sewer mains 12 and 14 having different height positions are connected to the manhole 10, respectively. The sewer main (upstream sewer main) 12 located above is fixed to the wall 10a, which is the skeleton of the manhole 10, at its end 12a, and is connected by this and is open to the inside of the manhole 10. .. Further, the sewer main (downstream side sewer main) 14 located below is also connected to the wall 10a of the manhole 10 and is open to the inside of the manhole 10.

An outer sub-pipe 16 is connected to the sewer main 12 on the upstream side. The outer sub-pipe 16 extends in the vertical direction, is fixed to the sewer main 12 on the upstream side at one end (upper end) 16a, is connected by this, and is open to the inside of the sewer main 12. .. Further, the outer sub-pipe 16 is connected to the wall 10a of the manhole 10 at the other end (lower end) 16b and is open to the inside of the manhole 10. The outer subtube 16 is usually arranged at a position close to 10 in the manhole. Therefore, the upper end portion 16a of the outer sub-pipe 16 is within reach from the inside of the manhole 10 through the sewer main main 12.

Next, the seismic structure provided in the manhole 10 will be described. The seismic structure of the manhole 10 can be constructed according to the construction method described later with reference to FIGS. 2 to 6.

As shown in FIG. 6, the seismic structure of the manhole 10 includes an annular groove 18 formed in the outer subpipe 16 and an elastically deformable water blocking material 20, and an annular hole 22 formed in the wall 10a of the manhole 10. And a water blocking material 24 that can be elastically deformed.

The annular groove 18 is provided in the vicinity of the upper end portion 16a of the outer sub-tube 16, preferably in a part 26 directly below the end portion 16a, and is open to the inside of the outer sub-pipe 16. The water blocking material 20 is, for example, a rubber circle that fills both the annular groove 18 and the inside of the outer sub-pipe 16 which is the space surrounded by the groove, that is, a part 28 (see FIG. 2) in the outer sub-pipe 16. It consists of a board.

On the other hand, an annular hole 22 (see FIG. 5) provided in the wall 10a of the manhole 10 surrounds the end 12a of the sewer main 12. The water blocking material 24 is made of, for example, a rubber elastic sealing material that fills the annular hole 22.

A part 26 of the outer sub-tube 16 in which the annular groove 18 is formed is thinner than the other part 16c (see FIG. 2) except for the upper end portion 16a of the outer sub-tube 16. It has low mechanical strength and is a structural weakness. Therefore, when the outer sub-pipe 16 receives an seismic force, a part 26 thereof is relatively easily destroyed. When the rupture occurs due to an earthquake, the connection of the sewer main 12 to the outer sub-pipe 16 is released, and the relative displacement of the sewer main 12 to the outer sub-pipe 16 under the elastic deformation of the water blocking material 20 is allowed. The water blocking material 20 blocks the inflow of groundwater and earth and sand into the sewer main 12 in the surrounding ground.

Further, the part 10a1 (see FIG. 5) described later remaining in the annular hole 22 formed in the wall 10a of the manhole 10 is relatively easily destroyed by the seismic force. When destruction due to an earthquake occurs, the end 12a of the sewer main 12 is released from the manhole 10, and the relative displacement of the sewer main 12 with respect to the wall 10a of the manhole 10 under the elastic deformation of the water blocking material 24 is allowed. Will be done. The water blocking material 24 blocks the inflow of groundwater and earth and sand into the manhole 10 in the surrounding ground.

Due to the release of the connection between the sewer main 12 and the outer sub-pipe 16 and the release of the fixation between the wall 10a of the manhole 10 and the sewer main 12, the relative displacement of the sewer main 12 is allowed. It is possible to prevent the pipe 12 or the wall 10a of the manhole 10 from being damaged or destroyed.

Further, by providing an annular groove 18 that does not penetrate the pipe wall of the outer sub-pipe 16 as the arrangement space of the water blocking material 20, groundwater and earth and sand flow into the inside of the outer sub-pipe 16 during the formation work of the groove 18. Can be prevented.

The water blocking material 20 arranged in the annular groove 18 of the outer sub-pipe 16 may be made of a ring that fills only the groove 18 instead of being made of the disk. An example of the ring will be described later.

Next, an example of a method for constructing the seismic structure of the manhole 10 will be described with reference to FIGS. 2 to 6.

First, from the inside of the manhole 10 and the sewer main pipe 12, an annular groove 18 that opens to the inside of the outer sub pipe 16 is formed in a part 26 of the outer sub pipe 16 located directly below the end portion 16a of the outer sub pipe 16. Form.

The annular groove 18 can be formed by using the cutting device 30 shown in FIGS. 7 to 9.

The cutting device 30 includes a pair of leg members 32, a rod 34 having one end 34a and an other end 34b, a shaft 36, a motor 38, and a concrete cutter 40.

Each leg member 32 shown in the figure has an L shape as a whole. The leg members 32 are spaced apart from each other and have two pieces 32a facing each other and two other pieces 32b facing each other.

The rod 34 is slidably attached to one piece 32a of both leg members 32 in the longitudinal direction thereof, and penetrates one piece 32a of both leg members 32. The rod 34 shown is made of an elongated flat plate and has a rectangular cross-sectional shape. The rod 34 can have a circular cross-sectional shape instead of the illustrated example. However, for convenience of operation or handling of the cutting device 30, the rod 34 does not rotate about the axis of the rod 34 with respect to the leg members 32, for example, elliptical, semicircular, other polygonal, etc. It is desirable that it has a cross-sectional shape.

The shaft 36 is attached to one end 34a of the rod 34 so that it can rotate around its axis. In the illustrated example, the shaft 36 has a columnar shape as a whole, and has a large diameter portion 36a having a relatively long length dimension and a small diameter portion 36b connected to the large diameter portion having a relatively short length dimension. It is composed of a portion 36b and a bolt 36c that is screwed into the small diameter portion 36b and projects from the small diameter portion. The shaft 36 extends between the leg members 32 orthogonally to the rod 34, and the large diameter portion 36a of the rod 34 is in contact with one side surface of the rod 34 (the lower surface (hereinafter, referred to as the lower surface for convenience) in the drawing) and has a small diameter. The portion 36b penetrates the rod 34. The shaft 36 is provided in the small diameter portion 36b and is arranged in a circumferential groove (not shown) extending in the circumferential direction thereof, and is in contact with the other one surface of the rod 34 (the upper surface (hereinafter, referred to as the upper surface for convenience) in the drawing). It is held by the rod 34 via the C ring 44. The shaft 36 rotates around its axis by applying a rotational force to the bolt 36c using a tool T (see FIG. 13) such as a wrench.

The motor 38 is fixed to the shaft 36, and its rotation axis extends parallel to the axis of the shaft 36. In the illustrated example, the shaft 36 and the motor 38 are arranged in parallel on the oval plate 46 and fixed to the plate 46, and the motor 38 is fixed to the shaft 36 via the plate 46. Has been done. Here, the motor 38 extends between the leg members 32, and its rotation shaft 38a penetrates the plate body 46. The motor 38 can be used by arbitrarily selecting from a hydraulic motor, a pneumatic motor, an electric motor, and the like.

The concrete cutter 40 includes a plurality of stages of round blades 40a rotatably attached to the rotating shaft 38a of the motor 38 around the axis of the rotating shaft. More specifically, the multi-stage round blade 40a is attached to the cylindrical hub 40b and surrounds the hub 40b. Further, the multi-stage round blade 40a is attached to the rotating shaft 38a of the motor 38 via the hub 40b. The round blade 40a has an outer diameter smaller than the inner diameter of the outer subtube 16.

The cutting device 30 preferably includes a positioning member (first positioning member) 48 that positions the concrete cutter 40 inside the outer subpipe 16. The first positioning member 48 can be fitted to the outer subtube 16 arranged between the leg members 32, more specifically between the other piece 32b of the leg member 32 and attached to both other piece 32b. It consists of a cylindrical frame.

The cutting device 30 also preferably includes a positioning member (second positioning member) 50 that positions the shaft 36 on the axis L (see FIG. 12) of the outer subtube 16. The second positioning member 50 (shown) is provided on the upper surface of one end portion 34a of the rod 34 and is composed of a protrusion located between the two leg members 32, more specifically between the one piece portion 32a of the both leg members 32. The protrusion comprises a bolt that is screwed into the rod 34 and projects onto the top surface of the rod.

The cutting device 30 further preferably has a handle 52 attached to the other end 34b of the rod 34. The illustrated handle 52 has a rod shape as a whole, is orthogonal to the rod 34, and extends in the width direction of the rod 34.

When forming the annular groove 18 in the outer sub-pipe 16 using the cutting device 30, the cutting device 30 is carried into the manhole 10 through the entrance 10b of the manhole 10 as shown by an arrow 54 in FIG. .. Carry-in is performed by suspending the cutting device 30 from the ground into the manhole 10 with the one end 34a of the rod 34 facing down, for example, using a rope (not shown).

Next, by the hand of a worker (not shown) waiting in the manhole 10, the rod 34 of the suspended cutting device 30 is leveled, and one end 34a thereof is directed toward the end 12a of the sewer main 12. This is inserted into the sewer main 12 from inside the manhole 10.

Next, the both leg members 32 are placed on the sewer main main 12 so that the both leg members 32 straddle the end portion 16a of the outer subpipe 16. Prior to this placement, the concrete cutter 40 is placed in a position where it can be received inside the outer subpipe 16. As a result, the rod 34 is supported in parallel with the axis of the sewer pipe 12 via the both leg members 32, and the concrete cutter 40 is suspended inside the outer sub pipe 16 via the rod 34. The arrangement position of the concrete cutter 40 is predetermined so that it is located in the vicinity of the end portion 16a of the outer sub-pipe when suspended in the outer sub-pipe 16. In the illustrated example, the concrete cutter 40 is received inside the outer secondary pipe 16 by fitting the first positioning member 48 to the end portion 16a of the outer secondary pipe 16.

After that, the motor 38 is operated to drive and rotate the concrete cutter 40. Next, a pressing force is applied to the rod 34 or the handle 52 to slide the rod 34 with respect to both leg members 32, and one end portion 34a of the rod 34 is advanced further into the sewer main pipe 12. As a result, the shaft 36 is positioned on the axis L of the outer subpipe 16. In the illustrated example, the rod 34 is advanced until the second positioning member 50 comes into contact with a piece 32a of one of the leg members 32 located on the inner side of the sewer main 12. .. As a result, the shaft 36 is positioned on the axis L of the outer subpipe 16.

Until the shaft 36 is positioned on the axis L of the outer secondary pipe 16, the round blade 40a of the concrete cutter 40 in the driven and rotated state moves toward the inner peripheral surface 16d of the outer secondary pipe 16, and then the outer side. While exerting a cutting action on the auxiliary pipe 16, it moves to a position in front of the inner peripheral surface 16d to the outer peripheral surface 16e (see FIG. 12). In order to enable such movement of the round blade 40a, the outer diameter of the round blade 40a, the distance between the shafts 36 and the axes of the motor 38, and the like are predetermined.

Next, a hand is inserted from the inside of the manhole 10 into the inside of the sewer main main 12, and the shaft 36 is rotated once around the axis L of the outer sub pipe 16 by using the tool T. As the shaft 36 rotates, the concrete cutter 40 moves eccentrically around the axis L of the outer subpipe 16 together with the motor 38. As a result, an annular groove 18 which is a cutting mark of the concrete cutter 40 is formed on the inner peripheral surface 16d of the outer subpipe 16 (see FIG. 13).

After forming the annular groove 18, the cutting device 30 is removed. After that, as shown in FIG. 3, these are mortared inside the outer sub-tube 16 below the annular groove 18, and further in the lower space 58 of the manhole 10 where the lower end portion 16b of the outer sub-pipe 16 opens in the illustrated example. The filling is filled to fill with the filling 56 as in. In the illustrated example, prior to filling the filling 56, for example, a formwork 60 that closes the space 58 below the manhole 10 is arranged. The filling of the filler 56 extends from, for example, a mortar supply device (not shown) installed outside the manhole 10, passes through the inside of the manhole 10 and the sewer main 12, and reaches the end 16a of the outer subpipe 16. This can be done by supplying the mortar from a tube (not shown).

Next, as shown in FIG. 4, a disc-shaped water blocking material 20 for filling the annular groove 18 and a part 28 in the outer sub-pipe surrounded by the groove is arranged. The water blocking material 20 can be arranged by inserting a hand from the inside of the manhole 10 into the inside of the sewer main main 12.

Next, as shown in FIG. 5, the inside of the outer sub-pipe 16 is filled with a filling 62 such as mortar above the annular groove 18 and therefore the water blocking material 20. As a result, the outer sub-pipe 16 is abolished.

Then, as shown in FIG. 5, an annular hole 22 is formed in the wall 10a of the manhole 10 so as to surround the end portion 12a of the sewer main main 12. The formation of the annular hole 22 can be performed using an existing concrete core cutter (not shown) having a tubular concrete core drill. As the concrete core cutter, for example, one that can be carried into the manhole 10 through its entrance 10b in a disassembled state can be selected and used. After carrying in, the tip of the concrete core drill is applied to the wall 10a of the manhole 10 to surround the open end of the end portion 12a of the sewer main 12 and its surroundings. Next, the concrete core drill is rotationally driven to advance from the inner peripheral surface of the wall 10a of the manhole 10 toward the outer peripheral surface thereof, and the wall 10a defining both the inner and outer peripheral surfaces of the manhole 10 is cut. Since the wall 10a of the manhole 10 has a cylindrical shape, the tubular concrete core drill that advances horizontally while cutting the wall 10a first reaches the outer peripheral surface of the wall 10a of the manhole at both left and right sides thereof. Next, the upper and lower sides thereof reach the outer peripheral surface of the wall 10a.

The formation of the annular hole 22 can be completed when the concrete core drill reaches the outer peripheral surface of the wall 10a following the left and right side portions thereof. However, in this way, when the upper and lower side portions of the concrete core drill reach the outer peripheral surface of the wall 10a, the left and right side portions of the concrete core drill that first reach the outer peripheral surface of the wall 10a are outside the manhole 10. It may protrude and damage other pipes that may be located around the wall 10a of the manhole 10.

From this, it is desirable that the cutting of the wall 10a of the manhole 10 is completed when the left and right side portions of the concrete core drill reach the outer peripheral surface of the wall 10a. As a result, an annular hole 22 is formed around the end portion 12a of the sewer main main 12, leaving the non-cut portion 10a1 which is a part of the wall 10a of the manhole 10 extending in the vertical direction. After that, the concrete core drill is removed, and an annular water blocking material 24 is placed in the formed annular hole 22 to fill the annular hole 22.

Next, an inner sub pipe 64 (FIG. 6) is provided inside the manhole 10. The illustrated inner sub-pipe 64 receives the sewage flowing out from the sewer main 12 at the upper end of the opening, and discharges the sewage flowing down the inside into the manhole 10 at the lower end of the opening. As a result, sewage can be guided to the vicinity of the opening end of the lower sewer main pipe 14 via the inner sub pipe 64 instead of the outer sub pipe 16 attached to the abandoned pipe.

The seismic structure can be constructed as another embodiment instead of the one embodiment as follows.

That is, after forming the same annular groove 18 as described above in the outer sub-pipe 16, a ring-shaped water blocking material (not shown) that fills only the groove, or more accurately, the groove 28, is formed in the annular groove 18. Deploy. After that, the same annular hole 22 as described above is formed in the wall 10a of the manhole 10, and the same water blocking material 24 as described above is arranged in the annular hole 22 to fill the annular hole 22. According to this, it is possible to construct a seismic structure in the manhole 10 that allows the outer sub-pipe 16 to be used without disposing of the outer sub-pipe 16.

In both the construction method of one embodiment of the seismic structure and the construction method of the other embodiment, the wall 10a of the manhole 10 is first formed before the annular groove 18 is formed in the outer subpipe 16. The formation of the annular hole 22 and the placement of the water blocking material 24 in the annular hole can be completed.

10 Manhole 10a Manhole wall 12 Sewer main 12a End of sewer main 16 Outer sub pipe 16a End of outer sub pipe 18 Circular groove 20 Water stop material 22 Circular hole 24 Water stop material 30 Cutting device 32 Leg member 34 Rod 36 Shaft 38 Motor 40 Concrete cutter 40a Round blade 48 First positioning member 50 Second positioning member 52 Handles 56, 62 Filling 64 Inner secondary pipe

Claims (9)

A seismic structure of the manhole in which the sewer main is connected to the wall of an existing manhole at its end and the outer sub-pipe is connected to the sewer main at its end.
An annular hole formed in the wall of the manhole and surrounding the end of the sewer main, and an elastically deformable water blocking material that fills the annular hole.
An annular groove formed in the outer secondary pipe and opened to the inside in the vicinity of the end portion of the outer secondary pipe, and an annular groove that fills or surrounds the annular groove and the inside of the outer secondary pipe that the groove surrounds. Seismic structure of manhole, including elastically deformable water blocking material to fill. The method for constructing a seismic structure of a manhole according to claim 1.
From the inside of the manhole and the sewer main, to form an annular groove in the outer sub-pipe that opens to the inside of the outer sub-pipe near the end thereof.
Placing an elastically deformable water blocking material to fill the annular groove,
Prior to or after the formation of the annular groove, an annular hole is formed from the inside of the manhole into the wall of the manhole so as to surround the end of the sewer main.
A method for constructing a seismic structure of a manhole, which comprises arranging an elastically deformable water blocking material to fill the annular hole. The method for constructing a seismic structure of a manhole according to claim 1.
From the inside of the manhole and the sewer main, to form an annular groove in the outer sub-pipe that opens to the inside of the outer sub-pipe near the end thereof.
Filling the inside of the outer subtube with a filling below the annular groove,
An elastically deformable water blocking material that fills the annular groove and the inside of the outer sub-pipe surrounded by the groove is arranged.
Filling the inside of the outer subtube with a filling above the annular groove,
To form an annular hole in the wall of the manhole that surrounds the end of the sewer main, prior to or after the formation of the annular groove.
An elastically deformable water blocking material that fills the annular hole is placed, and
A method for constructing a seismic structure of a manhole, which comprises providing an internal subpipe inside the manhole. In the method for constructing a seismic structure of a manhole according to claim 2 or 3, an annular groove is formed in the outer subpipe from the inside of the manhole and the sewer main to open into the inside of the outer subpipe near the end thereof. A cutting device used for
With a pair of leg members,
A rod having one end and the other end and attached to both leg members so as to be slidable in the longitudinal direction thereof.
A shaft attached to one end of the rod so that it can rotate around its axis.
A motor fixed to the shaft whose rotation axis extends parallel to the axis of the shaft,
The rotating shaft of the motor is provided with a concrete cutter having a plurality of stages of round blades rotatably attached around the axis of the rotating shaft.
Upon forming the annular groove, the rod is supported in the sewer main in parallel with the axis of the sewer main via both leg members, and the concrete cutter is supported via the rod in the outer sub pipe. A cutting device suspended in the vicinity of the end of the outer subpipe. The cutting device according to claim 4, further comprising a first positioning member for positioning the concrete cutter inside the outer subpipe. The cutting device according to claim 5, wherein the first positioning member comprises a cylindrical frame arranged between both leg members and attached to both leg members so as to be fitted to the outer subtube. The cutting device according to any one of claims 4 to 6, further comprising a second positioning member for positioning the shaft on the axis of the outer subtube. The cutting device according to claim 7, wherein the second positioning member comprises a protrusion provided at one end of the rod and located between both leg members. The cutting device according to any one of claims 4 to 7, wherein the rod has a handle attached to another end.

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