JP2016211354A - Flotation prevention device and flotation prevention method of manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for preventing flotation of a manhole in a ground change such as liquefaction phenomenon of the foundation.SOLUTION: A device for preventing flotation of a manhole by increasing the weight of the manhole more than the buoyancy generated in a ground change such as liquefaction phenomenon against a manhole peripheral wall 1 and a bottom part U comprises a plurality of storage bodies 2 and 22 and weights 3a and 3b. The storage bodies 2 and 22 have a storage part for storing the weights 3a and 3b, and each partition wall for surrounding the upper part, the lower part and four sides of the storage bodies 2 and 22 has a connection part for connecting with other adjacent storage bodies 2 and 22. Any of each partition wall is attached to be freely opened and closed so as to open the storage part, and each storage body 2 and 22 is arranged almost over the whole circumference of the inner peripheral side of the manhole peripheral wall 1.SELECTED DRAWING: Figure 1

Description

  An object of the present invention is to provide a levitation preventing device for preventing the manhole from rising due to ground change and a levitation preventing construction method thereof.

  The manhole is buried in the ground and communicates with the sewer. However, due to the ground liquefaction due to earthquakes and the like, manholes are lifted up, hindering road traffic, and the manhole peripheral walls and sewer pipes are broken.

Japanese Utility Model Publication No. 61-11841

  As a countermeasure against the liquefaction phenomenon as described above, a weight is installed on the inner peripheral side or the outer peripheral side of the manhole peripheral wall, and the manhole weight is made larger than the buoyancy of the manhole. Among these, there is one that increases the weight of the manhole by arranging a block-shaped casting on the inner peripheral side of the peripheral wall of the manhole after securing a space for passing a person. However, in the manhole, the casting is corroded by the gas generated from the sewage, which necessitates short-term casting replacement and maintenance, which increases maintenance costs. Furthermore, in manholes that are required to operate for a long period of about 50 years, it is a serious defect that the effect of preventing levitation cannot be obtained due to corrosion of castings.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a manhole levitation prevention device and a levitation prevention method in a ground change such as a ground liquefaction phenomenon.

  The invention according to claim 1 of the present invention is an apparatus for preventing the manhole from rising by making the weight of the manhole larger than the buoyancy generated by the ground change such as liquefaction phenomenon with respect to the manhole peripheral wall and the bottom, The container includes a plurality of containers and a weight, and the container has a container for receiving the weight, and each partition wall surrounding the upper and lower parts and the four circumferences of the container is connected to another container adjacent to the container. Since each of the partition walls is openably and closably attached, the accommodating portion can be opened, and each accommodating body extends over substantially the entire circumference on the inner peripheral side of the manhole peripheral wall. It is characterized by being arranged.

  The invention according to claim 2 of the present invention is characterized in that the container has a shape in which the lower end portion coincides with the bottom of the manhole, and the upper end portion is formed so that other containers can be stacked. To do.

  The invention according to claim 3 of the present invention includes a main body having a bottomed cylindrical shape, a storage section that surrounds the four circumferences and the bottom by a partition wall of the main body, and a lid that closes the upper opening of the main body. It is characterized by comprising.

  The invention according to claim 4 of the present invention is characterized in that the container has water-stopping members interposed between the adjacent upper and lower sides and both sides.

  According to a fifth aspect of the present invention, the container has a connecting portion on one side portion adjacent to the container, and a connecting portion on the other side portion, and each connecting portion is connected in a male and female shape. The water stop member is provided at the tip of one of the connecting portions.

  According to a sixth aspect of the present invention, a water stop member is provided on at least the upper surface of the container.

  The invention according to claim 7 of the present invention is characterized in that a fitting groove for fitting the water stop member is provided on at least the upper surface of the container.

  The invention according to claim 8 of the present invention is characterized in that the container has a concave groove that is continuous in the vertical direction on the inner peripheral portion.

  In the invention according to claim 9 of the present invention, the weight has a shape and a size substantially coinciding with the receiving portion, is divided into at least three or more, and the weight disposed between the weights on both sides is between When inserted, the weights arranged on both sides are pushed and expanded.

  The invention according to claim 10 of the present invention is characterized in that the container is rotatably connected to a connecting portion with another adjacent container.

  According to the eleventh aspect of the present invention, among the containers arranged along the inner peripheral part of the manhole peripheral wall, the container arranged at the lowermost stage can be attached to the bottom of the manhole while avoiding the existing pipe. It is characterized by.

  The invention according to claim 12 of the present invention includes a step of connecting a plurality of containers on the bottom of the inner peripheral side of the manhole peripheral wall and disposing the container over the entire circumference of the manhole peripheral wall. , A step of adding the number of weights calculated by the levitation determination formula, a step of adding a weight in the above step, and a step of stacking other containers on each of the containers arranged in the lowest stage, forming through the above steps It is characterized by that.

  According to the invention described in claim 1 of the present invention, the container has a container that can accommodate an arbitrary number of weights, and at least the container includes the weight and the space on the inner peripheral side of the manhole. It has a separating partition. Thereby, since gas such as hydrogen sulfide generated in the manhole and the weight do not come into contact with each other due to the partition walls of the container, corrosion of the weight due to the generated gas can be prevented. Therefore, since the weight can be used in the manhole for a long time, the effect of preventing the manhole from floating due to the liquefaction phenomenon can be continuously provided for a long time.

  According to the invention described in claim 2 of the present invention, the invert slope at the bottom of the manhole or the shape of the lower end of the container placed at the lowest level in accordance with the existing pipe is made to correspond to the bottom. The containers stacked above the lower container can be stably placed.

  According to the third aspect of the present invention, since the housing portion of the housing is sealed, contact with the gas generated in the manhole can be prevented even if the housing is a single body. Thereby, since a container can be set to the weight larger than the buoyancy of a manhole in an individual unit, it becomes possible to perform the construction for preventing the levitation without waste according to the on-site situation.

  According to the invention described in claim 4 of the present invention, the water blocking member is interposed between the stacked containers, so that the water that has entered from between the adjacent containers enters between the container and the peripheral wall of the manhole. Can be prevented. Thereby, the fall of each container installed in the manhole can be prevented.

  According to the invention described in claim 5 of the present invention, the connecting portion of the container is connected in a male or female shape having a concave shape or a convex shape, and further, the tip of the convex connecting portion has water expandability. By providing the water stop member, the water stop member is surely disposed at each connecting portion even if the containers adjacent to the left and right are rotated by ground vibration or the like.

  According to invention of Claim 6 among this invention, when a container is laminated | stacked up and down by arrange | positioning a water stop member at least on the upper surface of a container, a water stop member is arrange | positioned between each container. By closing the gap, the water tightness of the ascent prevention device of the present application is ensured.

  According to the invention described in claim 7 of the present invention, by providing the holding groove for holding the water stop member on at least the upper surface of the container, the water stop member can be firmly positioned on the container and each of them stacked up and down. Since the water blocking member is crushed by the weight of the upper container between the containers, the water blocking member is closely interposed between the containers. Thereby, the watertightness between the upper and lower containers is ensured.

  According to the invention described in claim 8 among the present invention, the reinforcing material such as a reinforcing bar erected from the bottom of the manhole is placed along the reinforcing material arranging groove provided in the inner peripheral portion of the container. Therefore, the stacked containers are prevented from collapsing in the manhole, and the anti-floating device of the present application is provided with reliable earthquake resistance.

  According to the ninth aspect of the present invention, when a plurality of weights are combined, the shape is substantially the same as that of the accommodating portion. Thereby, as the weights arranged between the two are inserted into the accommodating portion, the weights on both sides are pushed and pressed against the side wall of the accommodating body, so that the accommodating body can be stably installed. Moreover, since the weight is divided and formed, the weight can be adjusted freely.

  According to the invention described in claim 10 of the present invention, since the adjacent containers are connected to each other so as to be rotatable at the connecting portion, the levitation preventing device can be adapted to various manhole peripheral walls having different shapes. Can be installed.

  According to the eleventh aspect of the present invention, since the container disposed at the lowermost stage has a shape corresponding to the invert or existing pipe at the bottom of the manhole, each container is stably installed in the manhole. it can.

  According to the twelfth aspect of the present invention, the weight that is greater than the buoyancy that is assumed to be applied to the manhole with a container containing an arbitrary number of weights over substantially the entire circumference of the inner wall of the manhole. As necessary, only the required number is stacked. Thereby, the weight put into the accommodating part by the partition of the accommodating body can be prevented from coming into contact with the gas generated in the manhole, and corrosion of the weight can be prevented. Furthermore, since the number of weights can be adjusted freely according to the assumed buoyancy, the construction cost can be reduced without using a useless container.

It is the perspective view which carried out the cross section of a part which shows the whole manhole rising prevention apparatus by this implementation. FIG. 2A is a cross-sectional view taken along line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2A. It is a perspective view of the container and weight used for the floating prevention device of a manhole by this implementation. (A) (b) is an enlarged view which shows the connection state of the accommodating bodies adjacent on either side. (A) (b) is an enlarged view which shows the connection state of the containers adjacent up and down. The weight by this implementation is shown, (a) is a front view which shows the state when inserting a center weight, (b) is a front view which shows the state after putting a weight. (A) of the container corresponding to the existing pipe used for the manhole levitation preventing apparatus according to the present embodiment is a longitudinal sectional view, (b) is a sectional view taken along the line CC, and (c) is required. It is the front view which expanded the part. (A)-(d) is the simplified figure which shows the construction procedure of the floating prevention apparatus of the manhole by this implementation. It is the perspective view which abbreviate | omitted a part of manhole floating prevention apparatus of other embodiment of this invention. (A) of the manhole floating prevention apparatus of other embodiment of this invention is a cross-sectional view which shows the inside of a container, (b) is a perspective view of a weight, (c) is a container. It is the cross-sectional view which expanded and connected the connection location. It is a perspective view of the container of other embodiments of the present invention. It is a perspective view which shows the container of the levitating prevention apparatus of the manhole of other embodiment of this invention. (A) which shows the whole manhole rising prevention apparatus of other embodiment of this invention is a top view, (b) is a longitudinal cross-sectional view. It is a cross-sectional view which expands and shows D in Fig.13 (a). It is a top view which shows other embodiment of this invention, (a) expands E in FIG. 16, and shows the operating state of each container, (b) expands F in FIG. Thus, the operating state of each container is shown. It is a whole top view which shows other embodiment of this invention, (a) is what was applied to the perfect circular manhole, (b) was what was applied to the elliptical manhole, (c) was rectangular This is applied to a manhole with a shape. (A) (b) is a cross-sectional view which shows other embodiment of this invention.

Hereinafter, an embodiment of a manhole floating prevention apparatus according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2 (a) and 2 (b), the manhole levitation preventing device according to the present embodiment is arranged on the inner peripheral side of the peripheral wall 1 of the manhole bottom U by stacking a plurality of containers 2 over the entire circumference. To do. Further, the total weight of the weights 3a and 3b installed in the manhole is calculated by a conventionally known levitation determination formula. And many of the above-mentioned levitation judgment formulas are that the outer periphery of the manhole peripheral wall 1 against the levitation force that the manhole is about to float due to the water pressure received on the outer periphery of the bottom of the manhole due to ground change such as liquefaction The value obtained by adding the frictional resistance between the soil and the backfill soil and the total weight of the weights 3a and 3b is set to be large.

  As shown in FIG. 3, the housing 2 surrounds the housing portion S with a partition wall 4 a formed of a highly weather-resistant resin, and has a bottomed cylindrical main body 4 that opens upward, and an upper side of the housing portion S of the main body 4. It is comprised from the lid | cover 5 which obstruct | occludes an opening part, The whole has comprised the circular arc shape. Further, as shown in FIG. 4 (a), the main body 4 has the holding grooves 6 recessed in the housing portion S side continuously in the partition walls 4a and 4a on both sides adjacent to the other housings 2 and 2 adjacent to each other. It is provided. Furthermore, when the plurality of containers 2 are arranged side by side on the entire inner circumference side of the manhole peripheral wall 1, the holding grooves 6 in the partition walls 4a and 4a on both sides of each container 2 face each other to form a circular cross section. The water stop member holding hole 7 to be formed is formed. Further, as shown in FIG. 4B, a round bar-shaped water stop member 8 is disposed in the water stop member holding hole 7. The water stop member 8 has elasticity, and its outer periphery expands after being disposed in the water stop member holding hole 7 so as to be in pressure contact with the partition walls 4a and 4a on both sides of the container 2 and adjacent container 2 , The gap between the two is closed. Thereby, the airtightness and watertightness of adjacent containers 2 and 2 are ensured.

  As shown in FIG. 5A, the container 2 has a connecting portion 9 at the upper end. The connection portions 9 are provided at two locations on the inner peripheral side of the manhole and on the outer peripheral side of the manhole, respectively, and the upper ends of the storage member 2 are formed by the two connection portions 9 and 9 as shown in FIG. The part is formed in an upward U-shape. Then, by inserting another container 2 into a groove-like portion having a substantially upward U-shape between the two connecting portions 9 and 9 of the container 2, the containers 2 adjacent to each other vertically The installation state can be stabilized when the plurality of containers 2 are stacked without separating the two.

  As shown in FIG. 6A, the weights 3a and 3b are divided into a total of three on both sides and the center. The weights 3a and 3b obtained by combining the parts divided as described above are formed in substantially the same shape and size as the accommodating portion S of the container 2, and two trapezoidal weights on both sides of the arrangement. 3a and a weight 3b having a substantially triangular shape at the center. And when all three weights 3a and 3b are put in the accommodating part S of the accommodating body 2, when the weight 3b arrange | positioned in the center is inserted below with its own weight like FIG. Each weight 3a, 3a is expanded. As a result, the weights 3a, 3a on both sides are pressed against the bulkheads 4a on both sides of the container 2, and the weights 3a, 3b hardly move within the container 2, so that even if subjected to external influences such as ground vibrations. When the container 2 is installed, it is stable.

  When the container 2 configured as described above is actually arranged on the inner peripheral side of the manhole peripheral wall 1, the manhole cover is opened to open the surface openings of the manhole peripheral wall 1, and the six containers 2 in total are It arrange | positions cyclically | annularly along the inner peripheral side of the surrounding wall 1 sequentially. Then, by pressing the water stop member 8 into the water stop member holding hole 7 provided between the adjacent containers 2, 2, the connection strength between the adjacent containers 2, 2 increases, Watertightness and airtightness between the adjacent containers 2 and 2 are ensured. Further, in the above state, the upper portion of the main body 4 constituting each container 2 to be used is open, and the total weight of the manhole is larger than the buoyancy applied to the manhole peripheral wall 1 and the bottom in the opened storage portion S. The predetermined number of weights 3a and 3b corresponding to the weight calculated by the flying height determination formula is inserted. And after putting the weights 3a and 3b in the accommodating part S, the lid | cover 5 is covered and sealed, and the weights 3a and 3b are isolated from external air. Thereby, the weights 3a and 3b in the accommodating part S of the container 2 come into contact with the gas generated in the manhole by being surrounded by the partition wall 4a and the lid 5 of the main body 4 of the container 2. Disappears. Therefore, the weights 3a and 3b are not easily corroded even after the anti-floating device according to the present embodiment is installed in the manhole.

  In addition, as shown in FIGS. 7A, 7B, and 7C, the above-described manhole levitation preventing device includes a container 22 that is disposed at the bottom of the manhole and a part of the structure of the container 2. Is different. As shown in FIG. 7 (c), the container 22 has a semicircular recess 23 at the lower end, and the recess 23 avoids the existing pipe 10 that communicates with the inside of the manhole peripheral wall 1 from the outside. It is provided for the purpose. As described above, when the container 22 arranged at the lowest stage of the levitation preventing device is arranged on the entire inner circumference side of the manhole peripheral wall 1, even if the existing pipe 10 is provided on the bottom U of the manhole, Since the container 22 can be stably installed on the bottom U of the manhole while avoiding the tube 10, the construction of the device for preventing the manhole from rising according to the present embodiment can be easily performed. Further, the bottom U of the manhole is provided with an invert, and is inclined toward the invert. As a result, there is a gap between the container 22 arranged at the lowest stage of the manhole rising prevention apparatus according to this embodiment and the bottom U of the manhole, but the gap is filled with mortar or the like.

The above-described manhole levitation prevention apparatus is applied to the manhole according to the following procedure.
As a first procedure, as shown in FIG. 8A, first, the lowermost container 22 is installed at the bottom U on the inner peripheral side of the manhole peripheral wall 1, and the existing pipe 10 provided at the bottom U of the manhole. In order to avoid this, the housing body 22 having the housing portion S opened without placing the lid 5 is placed over the entire circumference along the inner circumferential portion of the manhole peripheral wall 1.
As a second procedure, as shown in FIG. 8 (b), the weights 3a and 3b are put into the accommodating portions S of the respective accommodating bodies 22 arranged at the lowermost stage.
At this time, the number of weights 3a and 3b to be inserted into the accommodating portions S of the respective accommodating bodies 22 is adjusted according to the difference in manhole size, manhole weight, and the like where the anti-lift device according to the present embodiment is installed. Furthermore, after putting the weights 3a and 3b in the respective housings 22, the lid 5 is closed on the main body 4 of the housing 22 to close the housing part S.
As a third procedure, as shown in FIG. 8C, another container 2 is stacked on the lowermost container 22 installed in the second procedure described above. Similarly, a weight is put into the accommodating part S of each container 2 performed by said 2nd procedure, the lid | cover 5 is tightened on the upper part of each container 2, and the accommodating part S is obstruct | occluded.
As a fourth procedure, as shown in FIG. 8 (d), the containers 2 and 22 are sequentially stacked in one and two stages over almost the entire circumference on the inner peripheral side of the manhole peripheral wall 1, and further, The arrangement position of the container 22 in the lowermost stage in the embodiment and the container 2 in the second stage is a positional relationship in which the containers 2 and 22 are moved by half in the circumferential direction of the manhole peripheral wall 1, for example, like brickwork. And
By going through the above first to fourth procedures, the anti-floating device according to the present embodiment is installed in the manhole as shown in FIG.

As described above, the following operational effects can be obtained by constructing the manhole floating prevention apparatus according to the present embodiment.
For example, when the backfill soil on the outer peripheral side of the manhole peripheral wall 1 becomes mud due to a liquefaction phenomenon due to an earthquake or the like, the manhole cannot be held in the originally installed position. As a result, the manhole tends to float while being inclined by the respective external pressures applied from the outer peripheral side of the manhole peripheral wall 1 and the outer peripheral side of the bottom U. On the other hand, the total weight of the manhole is larger than the buoyancy generated in the manhole peripheral wall 1 and the bottom U by arranging the containers 2 and 22 with the weights 3 placed on almost the entire inner periphery of the manhole peripheral wall 1. By increasing the size, the manhole can be kept at a predetermined position without being lifted by the influence of ground change such as a liquefaction phenomenon.

  As another embodiment of the present invention, as shown in FIG. 9 and FIGS. 10A to 10C, the container 2 is continuously connected to one side part facing the other container 2 adjacent to the upper and lower parts. A convex portion (connecting portion) 13 is provided, and a connecting concave portion (connecting portion) 14 is provided on the other side portion. The connecting convex portion 13 is provided with a groove 15 having a substantially circular cross-section that is continuous in the vertical direction on the protruding tip side, and a rod-like elongated water-expandable rubber material (water-stop member) 16 is fitted into the groove 15. doing. Further, as shown in FIG. 11, a rubber packing (water blocking member) 17 having a thin seal shape is attached to the upper surface and the bottom surface of the container 2 over almost the entire length in the circumferential direction of the container 2. It is. Thereby, when each container 2 is arrange | positioned along the inner peripheral side part of the manhole surrounding wall 1, the right and left both sides where the container 2 adjoins the other container 2 are the water expansible rubber materials of the connection convex part 13. 16 is closely attached to the connecting recess 14 of the other container 2 adjacent to each other, and the gap between the connecting portions of the adjacent containers 2 is closed by the water-expandable rubber material 16 expanded with moisture, Water-tightness at the connection location of each container 2 is ensured. In addition, the rubber packings 17 are in close contact with the other containers 2 arranged above and below the container 2, and watertightness between the containers 2 arranged above and below is ensured. From this, the watertightness between all the accommodating bodies 2 arrange | positioned at the inner peripheral part of the manhole surrounding wall 1 is securable. Further, the container 2 according to the present embodiment has a weight 18 formed in a thin plate shape as shown in FIG. Further, a plurality of the above plate-like weights 18 are put into the accommodating portion S from above the accommodating body 2 so as to give a weight against the buoyancy to the accommodating body 2. Accordingly, the weight of the container 2 can be slightly changed by inserting and removing the plate-like weight 18, and the container 2 and the weight 18 are not excessively heavy with respect to buoyancy. No useless placement. Furthermore, since the weight 18 itself can be formed of a metal plate, iron scrap, metal powder, or the like, it is easy to obtain and the manufacturing cost of the anti-lift device according to the present embodiment can be reduced.

  As other embodiment of this invention, it has the concave groove (reinforcement material arrangement | positioning groove | channel) 29 extended up and down at the inner peripheral part of the container 2 like FIG. 12 and FIG. 13 (a) (b). Furthermore, a fitting groove 31 is provided on the upper surface of the lid 5 of the container 2. The concave groove 29 of the container 2 is provided substantially at the center in the circumferential direction of the inner peripheral side surface of the container 2. Furthermore, a substantially rectangular notch 30 is provided at both ends of the inner peripheral side surface of the container 2, and this notch 30 is connected to the other container that is adjacent when a plurality of containers 2 are connected to each other. It faces the notch 30 provided in the body 2, thereby forming a concave groove 29 having substantially the same shape as the concave groove 29 described above. When formed in this way, when each container 2 is arranged along the inner peripheral side portion of the manhole peripheral wall 1, the vertical direction is set at a plurality of locations spaced in the circumferential direction of the inner peripheral side portion of each container 2. A concave groove 29 extending in the direction is arranged. And, each concave groove 29 can be fitted with a SUS rebar (reinforcing material) 32 having excellent corrosion resistance. The lower end of the reinforcing bar 32 is fixed to the lowermost container 22 with a nut 34 and is erected from the bottom of the manhole. Further, when the reinforcing bars 32 are fitted in the respective concave grooves 29, the reinforcing bars 32 are arranged on the inner peripheral side portion of the containing bodies 2, whereby the reinforcing bodies 32 are seismically reinforced by the reinforcing bars 32. 2 falls into the manhole peripheral wall 1 due to the influence of ground vibration and the like and becomes difficult to collapse. Further, the water stop member 33 is fitted into the fitting groove 31 provided on the upper surface of the lid 5 of the container 2, thereby stopping the entire length of the upper surface of the container 2 in the circumferential direction as shown in FIG. 14. The water member 33 can be disposed in a state where the water member 33 is positioned in the fitting groove 31. Thereby, when the other container 2 is further stacked on the container 2 in which the water stop member 33 is fitted in the fitting groove 31, the water stop member 33 expanded with water is another container. It is crushed from above with a load of 2 and is widely arranged in the gap between the upper and lower containers 2. For this reason, the gap between the upper and lower containers 2 is closed by the water stop member 33 so that high water tightness can be secured.

As another embodiment of the present invention, as shown in FIGS. 15 (a) and 16 (a), it has a chamfered shape in which the corners of the four corners of the containers 2, 24, 25 are removed. Moreover, the container 2, 24, 25 by this implementation is combined with the container 25 from which the dimension of the circumferential direction differs. Further, the partition wall 4a on one side of the housings 2, 24, 25 has a connecting rotating portion (connecting portion) 11 with its tip protruding in a vast shape connected to the other adjacent housings 2, 24, 25. doing. Furthermore, the partition 4a on the other side of the housings 2, 24, 25 has a coupled rotating portion (connecting portion) 12 that is recessed toward the accommodating portion S and has substantially the same shape as the connecting rotating portion. ing. Further, when the container 2 is arranged along the inner periphery of the manhole peripheral wall 1, the connecting rotation part 11 of the one container 2, 24, 25 is connected to the other container 2, 24, 25. Slide into the part 12 from above and drop. At this time, the connecting and rotating part 11 having an enormous shape and the connected rotating part 12 having a concave shape for receiving the connecting and rotating part 11 are connected so as to be rotatable about the vertical axis. Furthermore, since the four corners of the containers 2, 24, 25 are chamfered, the containers 2, 24, 25 are within a certain range without buffering the corners of the four corners. Can be rotated. Thereby, the accommodating bodies 2, 24, and 25 can be freely arranged in the manhole peripheral wall 1. By configuring as described above, specifically, what is shown in FIG. 16 (b) is that the angles of the respective containers 2, 24, 25 are set along the inner side curvature of the manhole peripheral wall 1 having an elliptical shape. It is something that is changed little by little to correspond. Furthermore, what is shown in FIG. 16 (c) is one in which the container 2 and the corner container 24 are arranged on the inner peripheral side of the peripheral wall along the rectangular manhole peripheral wall 1. As shown in FIG. 16C, the corner housings 24 arranged at the four corners of the manhole peripheral wall 1 are formed in a substantially “<” shape. Yes, the connecting direction of the containers 2 adjacent to each other with the corner container 24 interposed therebetween is 90 °, or although not shown, the polygonal manhole peripheral wall 1 may be connected to other angles. Will be able to. Further, FIG. 17A shows a case in which a container support 28 having a ring shape is disposed over substantially the entire circumference on the inner peripheral side of each container 2 disposed along the manhole peripheral wall 1. The container support 28 is arranged on the inner peripheral portion of each container 2 so that the container support 28 supports from the inner peripheral side even if external pressure from the manhole peripheral wall 1 is applied to each container 2. Thus, the lodging of each container 2 into the manhole is prevented. Further, as shown in FIG. 17B, the container support 28 can be arranged on the outer peripheral part of each container 2, and at this time, each container 2 supports both the inner peripheral part and the outer peripheral part. As a result, the structure further resists the external pressure from the peripheral wall 1 of the manhole.
Reference numeral 27 denotes a connection part for connecting the container 2 up and down, and the structure thereof is substantially the same as that of the connection part 9 described above, but each container 2, 24, 25 is rotated. It is not provided at the corners so as not to interfere.

  The manhole levitation preventing device of the present invention is within the scope described in the claims, and each configuration of the housings 2, 22, 25, the corner housing 24, the weight 3, and the like described in the above embodiments. It is not limited to the shape of the parts. In the above-described embodiment, the accommodating bodies 2, 22 and 25 are arranged along the inner peripheral side of the manhole peripheral wall 1 by arranging six accommodating bodies 2, 22 and 25 having the same shape and the same size at intervals of approximately 60 °. Although what was arrange | positioned to the perimeter was shown, if the buoyancy can be surpassed without impairing the function of a manhole, the size and shape other than that may be sufficient. Each container 2, 22, 25 has a shape that can be arranged in a ring shape along the inner peripheral side of the manhole peripheral wall 1 and has a size that can be inserted from the surface opening of the manhole. . Further, the containers 2, 22, 24, 25 may be provided on the entire inner periphery of the manhole peripheral wall 1, or when there are obstacles such as scaffolds on the manhole peripheral wall 1, avoid them. Also good. Further, the material of the containers 2, 22, 24, 25 may be any material that can prevent the weight 3 from being corroded. For example, vinyl chloride which is low in cost and easily available and has good workability, and acrylic which has high durability and high internal visibility can be used. In addition, the connection part 9 between the containers 2 and 22 is also structured to be sandwiched between the two connection parts 9 and 9 in the above embodiment, but the containers 2, 22, 25 and the corner container Any means may be used as long as 24 does not fall down to the inner peripheral side of the manhole peripheral wall 1, and the containers 2, 22, 24, 25 may be fitted in unevenness. Further, the connecting rotation part 11 and the connected rotation part 12 between the accommodating bodies 2, 22, 25 and the corner accommodating body 24 are also connected in the connecting direction of the adjacent accommodating bodies 2, 22, 25 or the corner accommodating body 24. Any means can be used as long as it can easily connect adjacent containers 2, 22, 25 or corner containers 24. Furthermore, the water stop member 8 should just be what does not make a clearance gap by closely_contact | adhering between each accommodating body 2,22,25 and the corner accommodating body 24 which adjoin both sides. In the present embodiment, the water-stopping member 8 having water expandability such as butyl rubber or silicon is sandwiched, but the water-stopping member 8 may be mortar or the like and may not have water expandability. Moreover, although the container support tool 28 is attached to only some of the containers 2 in the above-described embodiment, the object of attachment may be another container 22, 24, 25. In addition, mortar or the like can be filled between the manhole peripheral wall and the rising prevention device of the present application to improve the installation stability of the rising prevention device.

DESCRIPTION OF SYMBOLS 1 Manhole surrounding wall 2 Container 3a, 3b Weight 4 Main body 4a Partition 5 Lid 6 Holding groove (connection part)
7 Water retaining member holding hole (connecting part)
8 Water stop member 9 Connection portion 10 Existing pipe 11 Connection rotation portion (connection portion)
12 Connected rotation part (connection part)
13 Connection convex part (connection part)
14 Connection recess (connection)
15 Groove 16 Water expansion rubber material (water stop member)
17 Rubber packing (water-stop member)
18 Weight 22 Container 23 Recess 24 Corner Container 25 Container 27 Connection Unit 28 Container Support 29 Concave Groove (Reinforcing Material Disposition Groove)
30 Notch 31 Fitting groove 32 Reinforcing bar (reinforcing material)
33 Water-expandable member (water-stop member)
34 Nut S Housing part U Bottom

Claims (12)

A device that prevents the manhole from rising by making the weight of the manhole larger than the buoyancy generated by ground changes such as liquefaction, with respect to the peripheral wall and bottom of the manhole,
The container includes a plurality of containers and a weight, and the container has a container for receiving the weight, and each partition wall surrounding the upper and lower parts and the four circumferences of the container is connected to another container adjacent to the container. Since each of the partition walls is openably and closably attached, the accommodating portion can be opened, and each accommodating body extends over substantially the entire circumference on the inner peripheral side of the manhole peripheral wall. A manhole levitation prevention device, characterized in that   2. The manhole floating prevention device according to claim 1, wherein the container has a shape in which a lower end portion coincides with a manhole bottom portion, and an upper end portion is formed so that another container can be stacked.   The container is composed of a main body having a bottomed cylindrical shape, a housing part that surrounds the circumference and the bottom part by a partition wall of the main body, and a lid that closes an upper opening of the main body. Or the anti-floating device of a manhole of 2.   4. The apparatus for preventing a manhole from rising according to claim 1, wherein water-stopping members are interposed on the upper and lower sides and on both sides adjacent to another adjacent container.   The container has a connecting portion on one side adjacent to each other and a connecting portion on the other side, and each connecting portion is connected in a male-female shape. 5. A manhole rising prevention device according to claim 4, wherein a water stop member is provided.   6. The manhole floating prevention apparatus according to claim 4, wherein a water stop member is provided on at least the upper surface of the container.   The apparatus for preventing a manhole from rising according to claim 6, wherein a fitting groove for fitting a water stop member is provided on at least the upper surface of the container.   The manhole according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the container has a reinforcing material disposition groove for disposing a long reinforcing material in the vertical direction on the inner periphery. Anti-floating device.   The weight is substantially the same shape and size as the receiving part, and is divided into at least three or more weights that are arranged on both sides when the weight placed between the weights is inserted between the weights on both sides. 9. The apparatus for preventing a manhole from rising according to claim 1, wherein the device is expanded.   The manhole according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the container is rotatably connected to a connecting portion with another adjacent container. Anti-floating device.   Among the containers arranged along the inner peripheral part of the manhole peripheral wall, the container arranged at the lowermost stage can be attached to the bottom of the manhole while avoiding the existing pipe. 4, 5, 6, 7, 8, 9 or 10 Manhole levitation prevention device. A step of connecting a plurality of containers on the bottom part on the inner peripheral side of the manhole peripheral wall and arranging it over substantially the entire periphery of the manhole peripheral wall;
A step of adding the number of weights calculated by the rising judgment formula to the housing part of each container,
A process of putting weights in the above process and stacking other containers on each container disposed at the bottom,
A method for constructing a manhole levitation prevention device, wherein the method is formed through the above steps.

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