JP7121955B1 - Seismic structure of manhole, construction method thereof, and cutting device used for implementation of construction method - Google Patents

Abstract

An earthquake-resistant manhole structure, a construction method thereof, and a cutting device are provided. A seismic structure is formed in a manhole wall (10a) and consists of an annular hole (18) surrounding the end of a sewage main pipe (12), a water stop material (20) filling the hole, a pipe wall of an outer secondary pipe (16), and protective concrete. An annular groove 22 extending radially inside and a water stop material 24 filling the groove are provided. The earthquake-resistant structure forms an annular groove 22 from the inside of the manhole and sewer main 12 to the outer secondary pipe 16 and protective concrete, fills the groove with a water stop material 24, and prior to or after forming the annular groove 22, the manhole is constructed by forming an annular hole 18 in the wall of the sewer main 12 surrounding the end of the sewer main 12 and filling it with a water stop material 20 . [Selection drawing] Fig. 5

Description

TECHNICAL FIELD The present invention relates to an earthquake-resistant structure applied to an existing manhole having an outer secondary pipe connected to a sewage main pipe and protected by protective concrete, a construction method thereof, and a cutting apparatus used for carrying out the construction method.

Conventionally, as an earthquake-resistant structure for an existing manhole that is connected to a sewer main pipe and has an outer secondary pipe that extends in the vertical direction, a water stop that can be elastically deformed between the manhole and the end of the sewer main pipe connected to the manhole. In addition, it is proposed to place an elastically deformable water stop material (other water stop material) in the space remaining after excising the upper end of the outer secondary pipe. It is According to this, the relative displacement of the sewage main pipe with respect to the manhole is allowed through the elastic deformation of the one water stop material, and the sewer with respect to the outer secondary pipe through the elastic deformation of the other water stop material. Relative displacement of mains is allowed. This prevents damage or destruction of sewer mains or even manholes in the event of an earthquake.

By the way, some existing manholes are protected by protective concrete surrounding the outer secondary pipe, and the protective concrete is in contact with the sewage main pipe directly below it. Therefore, when the conventional earthquake-resistant structure is applied to such a manhole, the protective concrete impedes the relative displacement of the sewage main pipe with respect to the outer secondary pipe.

Japanese Patent No. 6842094

In view of the above-mentioned conventional circumstances, the present invention provides a new earthquake-resistant structure applied to an existing manhole connected to a sewage main pipe and having an outer subpipe protected by protective concrete, and a construction method thereof. , and a cutting device provided for carrying out the construction method.

In the present invention, a sewage main pipe is connected at its end to an existing manhole, a vertically extending outer secondary pipe is connected to the sewage main pipe at its upper end, and the outer secondary pipe surrounds protective concrete. It relates to the earthquake-resistant structure of the manhole protected by The earthquake-resistant structure of the manhole includes an annular hole formed in the wall of the manhole and surrounding the end of the sewage main pipe, an elastically deformable water stop material filling the annular hole, and an upper end of the outer secondary pipe. an annular groove formed in the outer secondary pipe and the protective concrete in the vicinity of the outer secondary pipe and extending radially around the axis of the outer secondary pipe through the wall of the outer secondary pipe and the inside of the protective concrete; and and an elastically deformable waterproof material to be filled.

In the earthquake-resistant structure of the manhole according to the present invention, during an earthquake, the pipe wall of the outer secondary pipe and a part of the protective concrete around the annular groove extending radially inside the protective concrete are subjected to seismic force. The water-stopping material in the annular hole and the water-stopping material in the annular groove are each elastically deformed. Due to the elastic deformation of these water stop materials, relative displacement of the end of the sewer main with respect to the manhole and relative displacement of the sewer main with respect to the outer secondary pipe are allowed. This prevents the sewer main, or even the manhole, from being damaged or destroyed in the event of an earthquake.

The water stop material that fills the annular groove may be a ring that fills only the annular groove. According to this, continuous use of the outer secondary pipe is possible.

Further, the water stop material that fills the annular groove can be made of a plate-like body that fills both the annular groove and the space surrounded by the groove. Here, the earthquake-resistant structure of the manhole further comprises: a filler arranged below the annular groove and filling the inside of the outer secondary pipe; It comprises a blockage that closes and an inner secondary pipe installed in the manhole. According to this, the inside of the outer secondary pipe can be buried, the outer secondary pipe can be disposed of, and the newly provided inner secondary pipe can be used.

The present invention also relates to the construction method of the manhole earthquake-resistant structure, and has two embodiments.

In a construction method according to one embodiment, in the vicinity of the upper end of an outer secondary pipe extending vertically from the inside of a manhole or a sewage main pipe, the outer secondary pipe and the protective concrete are attached to the outer secondary pipe and the wall of the outer secondary pipe. forming an annular groove radially extending around the axis of the outer secondary pipe in the inside of the protective concrete; arranging an elastically deformable waterproofing material filling only the groove in the annular groove; Before or after the formation of the groove, an annular hole is formed in the wall of the manhole to surround the end of the sewer main, and an elastically deformable water stop material is placed in the annular hole to fill the hole. including doing

In addition, in the construction method according to another embodiment, the inside of the wall of the outer secondary pipe and the inside of the protective concrete in the vicinity of the upper end portion of the outer secondary pipe extending in the vertical direction from the inside of the manhole and the sewage main pipe. forming an annular groove radially extending around the axis of the outer tube; filling the interior of the outer tube with a filling below the annular groove; and forming the annular groove and a space surrounded by the groove. arranging an elastically deformable water stop material that fills these in, arranging a blocker that closes the upper end of the outer secondary pipe above the annular groove, prior to or after forming the annular groove forming an annular hole surrounding the end of the sewer main in the wall of the manhole, arranging an elastically deformable water stop material to fill the annular hole; Including installing an inner subpipe inside.

In the first and other embodiments, since the annular groove is formed from inside the manhole and inside the main sewage pipe, compared to the case where the ground is excavated from the outside of the manhole , the time and labor required for constructing the earthquake-resistant structure can be reduced. In addition, the annular groove forms the wall of the outer secondary pipe and the inside of the protective concrete so as to extend radially around the axis of the outer secondary pipe. After that, it is possible to prevent earth and sand in the ground and groundwater from flowing into the annular groove.

Moreover, according to the construction method according to the first embodiment, it is possible to construct an earthquake-resistant manhole structure that allows the use of the outer sub-pipe. Moreover, according to the construction method according to the other embodiment, it is possible to construct an earthquake-resistant manhole structure in which the outer sub-pipe is discarded and a newly provided inner sub-pipe can be used.

The invention further relates to a cutting device. In the method for constructing an earthquake-resistant manhole structure according to the one embodiment or another embodiment, the cutting device forms the annular groove from the inside of the manhole and the sewage main pipe to the outer subpipe and its protective concrete. used to

The cutting device includes an outer cylinder fitted to the upper end of the outer secondary tube and having a mounting portion for the outer secondary tube, and an outer tube fitted to and rotatably supported by the outer tube. an inner cylinder, a reaction force supporting member attached to the inner cylinder and extending downwardly of the inner cylinder, a propulsion mechanism supported by the reaction force supporting member and being an attachment portion for the reaction force supporting member, and the inner cylinder. a propulsion mechanism having a movable portion that is linearly movable in a direction perpendicular to the axis of the propulsion mechanism; a motor attached to the movable portion of the propulsion mechanism; a concrete cutter attached to the rotating shaft of the motor; and an operating handle pivotally attached to the barrel.

The formation of the annular groove in the outer secondary pipe and the protective concrete around it using the cutting device can be performed as follows.

First, the cutting device is inserted into the main sewage pipe through the manhole, and the outer cylinder is fitted to the upper end of the outer secondary pipe connected to the main sewer pipe, and placed on the upper end. At this time, the reaction force support member comes into contact with the inner peripheral surface of the outer secondary pipe. These operations can be performed by operating the operation handle inside the manhole. Next, the motor is actuated, thereby driving the concrete cutter to rotate, while linearly moving the movable portion of the propulsion mechanism. As a result, under the reaction force supported by the reaction force support member, the cutting force is sequentially applied from the concrete cutter to the wall of the outer secondary pipe and the protective concrete, and the protective concrete is cut through the wall of the outer secondary pipe. form a line of holes extending radially through the interior of the After forming the hole, the motor and concrete cutter, together with the moving parts of the propulsion mechanism, are retracted to their original position. Next, the inner cylinder is rotated by a required angle with respect to the outer cylinder, and the movable part of the propulsion mechanism is linearly moved again at the rotation angle position, so that it partially overlaps with the hole next to the one row of holes. Another row of holes communicating with this is formed. By repeating this hole forming operation at other rotational angular positions of the inner cylinder, it is possible to form an annular groove radially extending through the wall of the outer secondary pipe and the inside of the protective concrete.

The propulsion mechanism includes, for example, two sets of pantographs generally rhomboid-shaped that face each other and are supported by the reaction force support member; two upper and lower spacers disposed between the two sets of pantographs; A bolt having right-handed and left-handed threads extends between the sets of pantographs in the direction of extension of the axis of the inner cylinder. Here, each set of pantographs has two pairs of links, one of the two pairs of links has one end pin-connected to the upper spacer and a pin to the reaction force support member and the motor. Another pair of links has one end pinned to the lower spacer and the other end pinned to the reaction support member and the motor. Further, the bolt is screwed into both spacers at its right-hand threaded portion and left-handed threaded portion, and passes through both spacers. The bolt can be rotated, for example with a wrench, to extend and retract the two sets of pantographs, thereby linearly reciprocating the motor and concrete cutter.

1 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 an earthquake-resistant structure is provided; FIG. A state in which an annular hole is formed in the wall of a manhole to surround the end of a sewage main pipe for construction of an earthquake-resistant structure, and an elastically deformable water stop material is placed in the annular hole to fill the hole. It is a partial sectional view of a manhole. FIG. 4 is a partial cross-sectional view of a manhole showing a state in which annular grooves radially extending inside the outer pipe wall and protective concrete around it are provided for construction of an earthquake-resistant structure. FIG. 4 is a partial cross-sectional view of a manhole showing a state in which an elastically deformable water stop material filling the annular groove is arranged for construction of an earthquake-resistant structure. FIG. 4 is a partial cross-sectional view of a manhole with an earthquake-resistant structure. FIG. 4 is a partial cross-sectional view of a manhole that schematically shows a state when an earthquake force acts on the manhole provided with an earthquake-resistant structure. FIG. 4 is a front view of a cutting device used to form annular grooves in the outer secondary pipe and protective concrete; It is a top view of a cutting device. It is a left view of a cutting device. FIG. 4 is a front view of the cutting device in a state in which the propulsion mechanism of the cutting device is actuated; FIG. 4 is a partial cross-sectional view of a manhole showing a state in which a cutting device is inserted from within the manhole into the sewer main to form an annular groove in the outer secondary pipe and protective concrete; FIG. 4 is a partial cross-sectional view of the manhole showing the cutting device in the process of being placed from inside the sewage main pipe onto the outer secondary pipe. FIG. 4 is a partial cross-sectional view of a manhole showing a cutting device placed on the outer sleeve; FIG. 4 is a partial cross-sectional view of the manhole during the formation of a portion of the annular groove by a cutting device; FIG. 4B is a partial cross-sectional view of the manhole after formation of a portion of the annular groove by a cutting device; FIG. 11 is a partial cross-sectional view of the manhole before forming another portion of the annular groove by a cutting device; FIG. 11 is a partial cross-sectional view of the manhole during formation of another portion of the annular groove by the cutting device;

Referring to FIG. 1, an existing manhole installed in the ground E, to which the present invention is applied, is shown generally at 10. As shown in FIG.

The manhole 10 is connected to two sewage main pipes 12 and 14 at different heights. A sewage main pipe (upstream sewage main pipe) 12 located above is fixed to the wall 10a which is the frame of the manhole 10 at its end 12a, and is thereby connected to the manhole 10 and opened to the inside of the manhole 10. ing. Similarly, a lower sewer main (downstream sewer main) 14 is also fixed to the wall 10a of the manhole 10, thereby connecting to the manhole 10 and opening to the inside of the manhole 10.

The manhole 10 has an outer secondary pipe 16 that is connected to a sewage main pipe 12 on the upstream side and extends vertically. The outer secondary pipe 16 has upper and lower ends 16a and 16b, and is connected to the sewage main pipe 12 on the upstream side at the upper end portion 16a and is open to the inside of the sewage main pipe 12. As shown in FIG. In addition, the outer secondary pipe 16 is open to the sewage main pipe 14 on the downstream side at its lower end portion 16b. Outer pipe 16 is normally located in close proximity to manhole 10 . Therefore, the upper end 16a of the outer secondary pipe 16 is within reach from the inside of the manhole 10 through the sewage main pipe 12. As shown in FIG.

In addition, the outer secondary pipe 16 is protected by protective concrete 17 surrounding it. The protective concrete 17 is generally block-shaped and extends vertically between the upper and lower sewage mains 12 and 14 . The protective concrete 17 also has upper and lower end faces 17a, 17b contacting the upper and lower sewage mains 12, 14, respectively, and an outer peripheral face 17c partially contacting the wall 10a of the manhole 10. As shown in FIG.

Next, the earthquake-resistant structure according to the present invention applied to the manhole 10 will be described. The earthquake-resistant structure of the manhole 10 can be constructed according to the construction method described below with reference to FIGS.

As shown in FIG. 5, the earthquake-resistant structure of the manhole 10 includes an annular hole 18 formed in the wall 10a of the manhole 10, an elastically deformable water stop material 20 filling the annular hole, an outer secondary pipe 16 and a protective An annular groove 22 formed in the concrete 17 and an elastically deformable water stop material 24 filling the annular groove are provided.

An annular hole 18 in the wall 10a of the manhole 10 surrounds the end 12a of the sewer main 12 . More precisely, the annular hole 18 surrounds the end 12a of the sewer main 12 at a small distance radially outwardly from the end 12a. Thus, there is a portion 34 of wall 10a of manhole 10 between end 12a of sewer main 12 and annular hole 18 . The water stop material 20 is made of, for example, an elastic sealing material made of rubber. The water stop material 20 prevents groundwater and sediment in the ground E from flowing into the manhole 10 through the annular hole 18 during normal times and earthquakes.

On the other hand, the annular groove 22 provided in the outer secondary pipe 16 and the protective concrete 17 is positioned near the upper end portion 16a of the outer secondary pipe 16, preferably at a height position immediately below the upper end portion 16a. (Pipe wall) and the inside of the protective concrete 17 extend radially around the axis L1 of the outer sub-pipe 16 and open to the inside of the outer sub-pipe 16 (see FIG. 3). Preferably, the annular groove 22 extends inside the protective concrete 17 to a position just before reaching its outer peripheral surface 17c. Thus, there is a relatively thin portion 36 of protective concrete 17 defining the periphery of annular groove 22 . The illustrated water stop material 24 is made of, for example, a rubber disk that fills both the annular groove 22 and the cylindrical space 26 (FIG. 3) that the annular groove surrounds.

The illustrated seismic structure further includes a filling 28, such as mortar, disposed below the annular groove 22 and filling the interior of the outer tube 16, and an upper end of the outer tube 16 disposed above the annular groove 22. A blocker 30 such as mortar for blocking the inside of the manhole 16a and an inner secondary pipe 32 installed in the manhole 10 are provided. By filling the outer secondary pipe 16 with the filling 28, the outer secondary pipe 16 can be discarded and the inner secondary pipe 32 can be used instead. A blocker 30 disposed within the upper end 16a of the outer secondary pipe 16 fills the recess formed at the connection between the sewage main pipe 12 and the outer secondary pipe 16 due to the formation of the annular groove 22, smoothing the connection. cylindrical surface.

Further, as an earthquake-resistant structure according to another example instead of the earthquake-resistant structure according to the illustrated example, the water stop material 24 that fills the annular groove 22 fills only the annular groove 22 without filling the space 26, for example, a rubber ring. (not shown), without the packing 28 and the obturator 30, and without the inner secondary tube 32. According to this, instead of the illustrated example in which the outer secondary pipe 16 is solidified and discarded, it is possible to continuously use the outer secondary pipe 16 in a hollow state. In this example, the annular groove 22 and the water stop material 24 prevent groundwater and sediment in the ground E from flowing into the manhole 10 during normal times and during an earthquake.

A portion 36 of protective concrete 17 defining the periphery of annular groove 22 has relatively low mechanical strength and constitutes a structural weak point. Therefore, the portion 36 of the protective concrete 17 breaks relatively easily when subjected to seismic force. When this failure occurs, a portion 36 of the protective concrete 17 around the annular groove 22 breaks into a plurality of fragments (not shown) and the annular groove 22 is opened to the ground E. As a result, as shown in FIG. 6, elastic deformation of the water stop material 24 and accompanying relative displacement of the sewage main pipe 12 with respect to the outer secondary pipe 16 are allowed. A relative displacement of the end 12a of the sewer main 12 with respect to the manhole 10 is allowed. This prevents the sewer main 12 or, furthermore, the wall 10a of the manhole 10 from being damaged or destroyed.

Next, with reference to FIGS. 2 to 5, an example of a construction method of the earthquake-resistant structure of the manhole 10 will be described.

First, as shown in FIG. 2, an annular hole 18 is formed in the wall 10a of the manhole 10 to surround the end 12a of the sewage main 12. As shown in FIG. Forming the annular hole 18 can be done using an existing concrete core cutter (not shown) with a tubular concrete core drill. For the concrete core cutter, for example, one that can be disassembled and carried into the manhole 10 through the entrance 10b (FIG. 1) can be selected and used.

After loading, the tip of the concrete core drill is applied to the wall 10a of the manhole 10 to surround the open end 12a of the sewer main 12 and its surroundings. Next, the concrete core drill is rotationally driven and advanced from the inner peripheral surface of the wall 10a of the manhole 10 toward its outer peripheral surface to cut the wall 10a defining both the inner and outer peripheral surfaces of the manhole 10. As shown in FIG. Since the wall 10a of the manhole 10 has a cylindrical shape, the cylindrical concrete core drill, which advances horizontally while cutting the wall 10a, first reaches the outer peripheral surface of the manhole wall 10a on both left and right sides, Then, its upper and lower sides reach the outer peripheral surface of the wall 10a.

Formation of the annular hole 18 can be completed when the concrete core drill reaches the outer peripheral surface of the wall 10a with both left and right sides and then with its upper and lower sides. However, if this is done, when the upper and lower sides of the concrete core drill reach the outer peripheral surface of the wall 10a, the left and right sides of the concrete core drill that have reached the outer peripheral surface of the wall 10a first will fall outside the manhole 10. It may protrude and damage other pipes that may be located around the wall 10a of the manhole 10.

For this reason, it is desirable that the cutting of the wall 10a of the manhole 10 is completed when the left and right sides of the concrete core drill reach the outer peripheral surface of the wall 10a. As a result, an annular hole 18 is formed around the end portion 12a of the sewage main pipe 12, leaving a part of the wall 10a of the vertically extending manhole 10 that is not cut. After that, the concrete core drill is removed, and an annular water stop material 20 is arranged to fill the formed annular hole 18 .

Thereafter, as shown in FIG. 3, an annular groove 22 is formed from the interior of the manhole 10 and sewer main 12 . The annular groove 22 is formed in the vicinity of the upper end portion 16a of the outer secondary pipe 16, preferably at a height position immediately below the upper end portion 16a. It is carried out by sequentially excising part of the concrete 17 . As a result, an annular groove 22 radially extending around the axis L1 of the outer secondary pipe 16 is formed through the wall of the outer secondary pipe 16 and the inside of the protective concrete 17 . Here, the inside of the protective concrete 17 is excised, leaving a portion 36 of several millimeters from the outer peripheral surface 17c of the protective concrete 17, for example.

Next, as shown in FIG. 4, the interior of the outer secondary pipe 16 defining the space below the annular groove 22 is filled with a filling 28 such as mortar. In order to fill the space under the annular groove 22 with the mortar, for example, the mortar supply hose is passed from the ground into the manhole 10 and the sewage main pipe 12, and further into the outer sub pipe 16 through the upper end 16a of the outer sub pipe 16. Then, the inside of the outer secondary pipe 16 below the annular groove 22 and the space 38 (FIG. 1) below the lower end portion 16b of the outer secondary pipe 16 are filled with the mortar. The space 38 is blocked by a pre-installed barrier plate 40 (FIG. 1).

Next, a disk-shaped water stop material 24 is placed in the annular groove 22 and the cylindrical space 26 (FIG. 3) surrounded by the annular groove to fill both of them. Arrangement of the water stop material 24 can be performed by a worker inserting his or her hand into the sewage main pipe 12 from the inside of the manhole 10 . After placing the water stop material 24 , a blocker 30 is placed above the annular groove 22 to close the upper end 16 a of the outer secondary pipe 16 . The closing of the upper end portion 16a can be performed, for example, by filling the inside of the upper end portion 16a with mortar, placing a cap inside the upper end portion 16a, or the like. As a result, the inside of the outer secondary pipe 16 is filled with the water stop material 24, the filler 28 and the clogging object 30, and the pipe is discarded. After that, the inner secondary pipe 32 is arranged inside the manhole 10 . Thereby, the earthquake-resistant structure of the manhole 10 is constructed.

Regarding the formation of the ring-shaped hole 18 in the wall 10a of the manhole 10 and the arrangement of the water stop material 20 in the ring-shaped hole 18 in the construction method of the earthquake-resistant structure of the manhole 10, instead of the illustrated example, a ring-shaped groove 22 or even after placement of the packing 28 in the outer secondary tube 16, placement of the water stop material 24 in the annular groove 22, and placement of the obstruction 30.

The earthquake-resistant structure of the manhole 10 can be constructed by a construction method according to another example. In the construction method of the other example, after forming the annular hole 18 in the wall 10a of the manhole 10 and placing the water stop material 20 in the annular hole, similarly to the construction method of the one example, An annular groove 22 is formed in the outer secondary pipe 16 and the surrounding protective concrete 17 near the upper end 16a of the outer secondary pipe 16 from the inside of the manhole 10 and the sewage main pipe 12, and is inserted into the annular groove. An elastically deformable water stop material 24 to be buried is arranged. In another example, the water stop material 24 fills only the annular groove 22, for example, in a ring shape. Also, as in the previous example, after forming the annular groove 22, or further after placing the water stop material 24 in the annular groove 22, the end of the sewage main 12 is attached to the wall 10a of the manhole 10. An annular hole 18 is formed surrounding the periphery of the portion 12a, and a water stop material 20 is arranged to fill the annular hole 18. - 特許庁

Therefore, in the construction method of the other example, unlike the construction method of the one example, the filler 28 and the blocker 30 are not arranged in the outer secondary pipe 16, and the inner secondary pipe 32 is not installed. According to this, instead of the earthquake-resistant structure of the manhole 10 in which the outer sub-pipe 16 is solidified and discarded, the manhole 10 that can be continuously used as the outer sub-pipe 16 in a hollow state is maintained. A seismic structure can be constructed.

The annular groove 22 provided in the outer secondary pipe 16 and the protective concrete 17 can be formed using a cutting device 42 shown in FIGS. 7-10.

The cutting device 42 includes an outer cylinder 44 fitted to the upper end portion 16a of the outer secondary pipe 16, an inner cylinder 46, a reaction support member 48, a propulsion mechanism 50, a motor 52, a concrete cutter 54, and an operating mechanism. and a handle 56 .

The outer cylinder 44 has a mounting portion for the outer tube 16 . The mounting portion is fixed to the outer cylinder 44 and is composed of two plate-like projecting portions 44a and 44b that project radially outward from the outer peripheral surface of the outer cylinder 44 so as to face each other. The outer cylinder 44 can rest on the upper end 16a of the outer tube 16 at both overhangs 44a, 44b.

The inner cylinder 46 is fitted in the outer cylinder 44 and rotatably supported. In the illustrated example, two opposite bolts 58 are provided that are screwed into the upper portion of the inner cylinder 46 and extend radially outward. The inner cylinder 46 is placed on the outer cylinder 44 at the shaft portions of both bolts 58 and is thereby rotatably supported by the outer cylinder 44 . The inner cylinder 46 has its axis L2 extending on the axis L1 (FIGS. 3 and 13) of the outer tube 16 when the outer tube 44 is placed on the upper end portion 16a of the outer tube 16 .

The reaction force support member 48 includes a rod-shaped body 48a fixed to the inner peripheral surface of the inner cylinder 46 and extending downward from the inside to the outside of the inner cylinder 46, and a height that is fixed to the rod-shaped body 48a and contacts the lower end surface of the outer cylinder 44. and a curved plate 48b extending downward from the position along the bar 48a. The curved plate 48 b has an outer peripheral surface curved with the same curvature as the outer peripheral surface of the outer cylinder 44 .

The propulsion mechanism 50 is supported by the reaction force support member 48, and extends linearly in a direction orthogonal to the attachment portion of the reaction force support member 48 to the rod-shaped body 48a and the axis L2 (FIGS. 7 and 13) of the inner cylinder 46. and a movable portion that is movable to the

The illustrated propulsion mechanism 50 includes two sets of generally rhombic pantographs 60 that are supported by the rod-like members 48a of the reaction force support member 48 and face each other, and two upper and lower rod-like pantographs 60 that are arranged between the two sets of pantographs. Spacers 62 (see FIG. 8), 63 (see FIG. 9) and a bolt 64 having a right-handed threaded portion 64a and a left-handed threaded portion 64b extending downward between the two sets of pantographs 60 in the extension direction of the axis L2 of the inner cylinder 46 and

Each set of pantographs 60 has two pairs of links 66,68 and 70,72. A pair of links 66, 68 out of the two pairs of links has one end (upper end) 66a, 68a pin-connected to an upper spacer 62 (FIG. 8), a rod-shaped body 48a of the reaction force support 48 and It has other ends (lower ends) 66b and 68b that are pin-coupled to the motor 52, respectively. One ends (lower ends) 70a and 72a are pin-connected to the lower spacer 63 (FIG. 9), and the other end (upper end) is pin-connected to the rod-shaped body 48a of the reaction force support member 48 and the motor 52, respectively. ) 70b, 72b.

One end portions 66a and 68a of the pair of links 66 and 68 are overlapped with each other and joined to the upper spacer 62 at their end surfaces via one pin bolt 74 passing through these one end portions 66a and 68a. Further, the other ends 66b, 68b of the pair of links 66, 68 are connected to the rod-shaped body 48a of the reaction force support member 48 and the motor 52 via a pair of pin bolts 76, 78 penetrating therethrough. On the other hand, one end portions 70a and 72a of the pair of links 70 and 72 are also overlapped with each other in the same manner, and are joined at their end surfaces to the lower spacer 63 via one pin bolt 80 passing through these one end portions 70a and 72a. there is Further, the other ends 70b, 72b of the pair of links 70, 72 are positioned close to the other ends 66b, 68b of the pair of links 66, 68 and extend through the other ends 70b, 72b, respectively. pin bolts 82, 84 of the reaction force support member 48 and the motor 52. As shown in FIG. In the illustrated propulsion mechanism 50, the other end 66b of the link 66 and the other end 70b of the link 70 form the mounting portion of the propulsion mechanism 50, and the other end 68b of the link 68 and the link 72 The end portion 72 b forms the movable portion of the propulsion mechanism 50 .

A bolt 64 extending between the two sets of pantographs 60 is screwed into two upper and lower spacers 62 and 63 at its right-hand threaded portion 64a and left-handed threaded portion 64b, respectively, and passes through both spacers 62 and 63. . The bolt 64 can be rotated clockwise and counterclockwise using, for example, a wrench W (see FIG. 10). According to this, when the bolt 64 is rotated counterclockwise in the state shown in FIG. 7, the two sets of pantographs 60 operate to expand as shown in FIG. The other end 68b and the other end 72b of the link 72 move forward. On the contrary, when the bolt 64 is rotated clockwise in the state shown in FIG. The portion 72b is retracted (see FIG. 7).

The propulsion mechanism 50 may alternatively comprise, for example, a hydraulic jack (not shown) having a cylinder and plunger. Here, the cylinder of the hydraulic jack forms a mounting portion of the propulsion mechanism to the reaction support member 48 . Also, the plunger forms a movable portion of the propulsion mechanism, and a concrete cutter 54 is attached to the tip of the plunger.

The motor 52 is composed of a hydraulic motor, an electric motor, an air motor, or the like, and has a rotating shaft 52a. The motor 52 is attached to the other end 68b of the link 68 and the other end 72b of the link 72 of the two pairs of pantographs 60, which are the movable parts of the propulsion mechanism 50, and is in a supported state. It extends in a direction perpendicular to the axis L2 of the cylinder 46. As shown in FIG.

The concrete cutter 54 comprises a disc 54a attached to the rotating shaft 52a of the motor 52 and a plurality of bits 54b embedded in the disc. The operating handle 56 is composed of an elongated plate-like body 56a and a handle 56b attached to one end of the plate-like body. The operating handle 56 is attached to one overhanging portion 44a of the outer cylinder 44 via a hinge 86 at the other end of the plate-like body 56a, and is arranged to extend in the extending direction of the axis L2 of the inner cylinder 46 and in a direction perpendicular thereto. It is possible to swing between.

Cutting device 42 further includes a hydraulic jack 88, such as a hydraulic jack. However, it is possible not to have the hydraulic jack 88 . Hydraulic jack 88 has a cylinder 88a and a plunger 88b (FIG. 7). The hydraulic jack 88 is mounted around a pin 94 passing through a plate-shaped projection 90 provided on the other projecting portion 44b of the outer cylinder 44 and a pair of support plates 92 fixed to the cylinder 88a and holding the projection 90 therebetween. It is swingable.

Formation of the annular groove 22 in the outer secondary pipe 16 and the protective concrete 17 therearound by using the cutting device 42 can be performed as follows.

As shown in FIG. 11, first, the cutting device 42 is inserted from the manhole 10 into the sewage main pipe 12 with both the pantographs 60 contracted and the hydraulic jack 88 tilted. Push the entire device 42 onto the outer tube 16 . When pushed further, as shown in FIG. 12, a part of the cutting device 42 on the upper end portion 16a of the outer sleeve 16 swings against the operating handle 56 due to its own weight, and enters the outer sleeve 16. . Next, as shown in FIG. 13, the outer cylinder 44 is fitted to the upper end 16a of the outer secondary pipe 16, and its overhanging portions 44a and 44b rest on the upper end 16a of the outer secondary pipe 16. As shown in FIG. At this time, the axis L2 of the inner cylinder 46 extends on the axis L1 of the outer sub-pipe 16, and the bit 54b of the concrete cutter 54 of the cutting device 42 is positioned directly below the upper end portion 16a of the outer sub-pipe 16. It faces the inner peripheral surface 16c. Also, on the opposite side of the concrete cutter 54 , the curved plate 48 b of the reaction force support member 48 contacts the inner peripheral surface 16 c of the outer secondary pipe 16 . Here, the hydraulic jack 88 is swung to stand vertically, and its plunger 88b is extended upward and pressed against the inner peripheral surface of the sewage main pipe 12. As shown in FIG. Thereby, the cutting device 42 is fixed on the outer secondary pipe 16 . If the hydraulic jack 88 is not provided, a rod-shaped body (not shown) such as a square bar can be inserted from the manhole 10 into the sewage main pipe 12 to serve as a substitute for the hydraulic jack 88. can.

Next, the motor 52 is operated to rotate the concrete cutter 54 . During this time, the bolt 64 is rotated with a wrench W to expand the pantograph 60 . As a result, as shown in FIG. 14, the concrete cutter 54 is linearly propelled forward to sequentially cut the wall of the outer secondary pipe 16 and a portion of the protective concrete 17 . During this time, the reaction force support member 48 in contact with the outer secondary pipe 16 bears the thrust reaction force of the concrete cutter 54 . As a result, a line of hole 96 extending radially through the wall of the outer secondary pipe 16 and the inside of the protective concrete 17 is formed.

After forming hole 96, bolt 64 is turned in the opposite direction to retract pantograph 60, as shown in FIG. This causes concrete cutter 54 and motor 52 to linearly retract from hole 96 into outer secondary pipe 16 . Next, the inner tube 46 within the outer tube 44 is angularly rotated, and similarly a row of holes (not shown) similar to hole 96 partially overlapping and communicating with hole 96 are installed. to form In this way, a plurality of holes are formed over an angle of 360 degrees around the outer secondary pipe 16 (see FIGS. 16 and 17). As a result, an annular groove 22 made up of a plurality of holes partially overlapping each other and communicating with each other is formed around the axis L1 of the outer secondary pipe 16 .

After the annular groove 22 is formed, the hydraulic jack 88 is retracted to lower its plunger 88b, which is then swung and tilted, and the pantograph 60 is retracted. Thereafter, by pulling the operation handle 56 forward from inside the manhole 10, the cutting device 42 can be pulled out from inside the outer secondary pipe 16 and inside the sewage main pipe 12 into the manhole 10 and removed.

10 manhole 10a manhole wall 12 sewer main 12a sewer main end 16 outer secondary pipe 16a outer secondary pipe upper end 18 annular hole 20 water stop material 22 annular groove 24 water stop material 28 filler 30 blockage 32 Inner secondary pipe 42 Cutting device 44 Outer cylinder 46 Inner cylinder 48 Reaction force support member 50 Propulsion mechanism 52 Motor 54 Concrete cutter 56 Operation handle 60 Pantograph 60
62 spacer 64 bolts 66, 68, 70, 72 link 88 hydraulic jack

Claims (7)

A sewage main pipe is connected at its end to an existing manhole, a vertically extending outer secondary pipe is connected at its upper end to said sewer main pipe, and said outer secondary pipe is protected by protective concrete surrounding it. An earthquake-resistant structure for the manhole,
an annular hole formed in the wall of the manhole and surrounding the end of the sewer main, and an elastically deformable water stop material filling the annular hole;
An annular groove formed in the outer secondary pipe and the protective concrete in the vicinity of the upper end of the outer secondary pipe and extending radially around the axis of the outer secondary pipe through the wall of the outer secondary pipe and the protective concrete. and an elastically deformable water stop material that fills the annular groove. 2. An earthquake-resistant structure for a manhole according to claim 1, wherein the water stop material filling said annular groove comprises a ring filling only said annular groove. The water stop material that fills the annular groove comprises a plate-like body that fills both the annular groove and the space surrounded by the groove,
In addition, the earthquake-resistant structure of the manhole further includes a filler disposed below the annular groove and filling the inside of the outer secondary pipe, and a filler disposed above the annular groove and closing the inside of the upper end of the outer secondary pipe. 2. An earthquake-resistant structure for a manhole according to claim 1, comprising a blocker that blocks the manhole and an inner secondary pipe installed in the manhole. A method for constructing an earthquake-resistant manhole structure according to claim 1,
From the inside of the manhole and the sewage main pipe, in the vicinity of the upper end of the outer secondary pipe, to the outer secondary pipe and the protective concrete around it, the pipe wall of the outer secondary pipe and the inside of the protective concrete on the axis of the outer secondary pipe forming an annular groove radiating therearound;
arranging an elastically deformable waterproof material filling only the annular groove in the groove;
Before or after forming the annular groove, an elastically deformable water stop material is formed in the wall of the manhole to surround the end of the sewer main, and fills the annular hole. A method of constructing a seismic structure for a manhole, comprising placing a A method for constructing an earthquake-resistant manhole structure according to claim 1,
In the vicinity of the upper end of the outer sub pipe extending vertically from the inside of the manhole and the sewage main pipe, the outer sub pipe and the protective concrete around it are connected to the outer sub pipe wall and the inside of the protective concrete. forming an annular groove extending radially around the axis of the tube;
filling the interior of the outer secondary tube with a filler below the annular groove;
arranging an elastically deformable waterproof material filling the annular groove and the space surrounded by the annular groove;
arranging a blocker for blocking the upper end of the outer secondary pipe above the annular groove;
Before or after forming the annular groove, an elastically deformable water stop material is formed in the wall of the manhole to surround the end of the sewer main, and fills the annular hole. to place
A method of constructing an earthquake-resistant structure for a manhole, comprising installing an inner subpipe inside the manhole. 6. In the method for constructing an earthquake-resistant manhole structure according to claim 4 or 5, from the inside of the manhole and the sewage main pipe, an outer secondary pipe extending in the vertical direction and the protective concrete around it are provided with the pipe wall of the outer secondary pipe and the protective concrete. A cutting device used to form an annular groove radially extending around the axis of the outer secondary pipe in the interior of the
an outer cylinder fitted to the upper end of the outer secondary pipe and having a mounting portion for the outer secondary pipe;
an inner cylinder fitted to and rotatably supported by the outer cylinder;
a reaction force support member attached to the inner cylinder and extending downward of the inner cylinder;
a propulsion mechanism supported by the reaction force support member, the propulsion mechanism having an attachment portion for the reaction force support member and a movable portion linearly movable in a direction perpendicular to the axis of the inner cylinder;
a motor attached to the movable part of the propulsion mechanism and a concrete cutter attached to the rotating shaft of the motor;
A cutting device, comprising: an operation handle attached to the outer cylinder so as to be swingable. The propulsion mechanism includes two sets of pantographs having a rhombic shape as a whole and opposed to each other supported by the reaction force support member;
two upper and lower spacers arranged between the two sets of pantographs;
a bolt having a right-hand thread and a left-hand thread extending between the two sets of pantographs in the extension direction of the axis of the inner cylinder;
Each set of pantographs has two pairs of links, one of the two pairs of links having one end pinned to the upper spacer and pinned to the reaction force support member and the motor. Another pair of links has one end pin-connected to the lower spacer and the other end pin-connected to the reaction force support member and the motor,
7. The cutting device according to claim 6, wherein said bolt is screwed into both spacers at its right and left threaded portions, respectively, and passes through both spacers.

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