Rehabilitation members and rehabilitation methods for manholes or drains

Abstract

To provide a rehabilitation component that allows for efficient rehabilitation of manholes and other containers, is highly versatile, and reduces costs. [Solution] The rehabilitation member 1 comprises a riser pipe 10, a riser pipe side inlet 12, a riser pipe side outlet 14 located below the riser pipe side inlet 12, an invert 20 driven into the riser pipe 10, an inlet side joint 30A or an outlet side joint 30B attached to the riser pipe 10, and joint members 40, 40 slidably fitted into the inlet side joint 30A and the outlet side joint 30B. The invert 20 is positioned from below the lower end of the opening of the riser pipe side inlet 12 to above the lower end of the opening of the riser pipe side outlet 14. The inlet side joint 30A and the outlet side joint 30B are connected to the inlet 3 and the outlet 5 via the joint members 40. The joint members 40, 40 are joined around the inlet 3 and the outlet 5, thereby connecting the inlet side joint 30A to the inlet 3 and the outlet side joint 30B to the outlet 5.

Description

Technical Field

[0001] The present invention relates to a regenerative member and a regeneration method for a manhole or a manhole cover.

Background Art

[0002] Conventionally, aging manholes or manhole covers need to be regenerated (repaired) due to corrosion, or intrusion of foreign matters such as rainwater or grass from joints. In regenerating manholes or manhole covers as described above, conventionally, a person enters the manhole or manhole cover and regenerates it with a regenerative member, or constructs a new manhole or manhole cover itself (for example, Patent Document 1). For example, when there is little working space in a manhole, the worker may be suspended upside down and work may be performed inside the manhole, and there is a concern that the burden on the worker may increase.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the manhole rehabilitation method described in Patent Document 1 involves excavating the invert of the manhole, leveling the ground so that the bottom of the manhole body and the existing inflow and outflow pipes are at the same height, then butting the connecting pipe of the saddle joint, which is made by bonding a connecting pipe of the same diameter as the existing inflow and outflow pipes to a saddle curved to a radius of curvature corresponding to the inner diameter of the manhole, with the existing inflow pipe, fixing the saddle to the inner wall surface of the manhole with anchor bolts and joining the periphery of the saddle, and then installing the manhole body on the leveled bottom surface of the manhole, with the inflow side receiving portion connected to the connecting pipe of the saddle joint The saddle joint is inserted into the manhole, and the connecting pipe of the saddle joint, with a collar inserted into the connecting pipe, is butted against the existing outflow pipe. The saddle is then fixed to the inner wall of the manhole with anchor bolts, and the periphery of the saddle is joined. After that, the collar is pulled out along the connecting pipe of the saddle joint, leaving one half in the connecting pipe of the saddle joint, and the other half is inserted into the outflow side opening of the manhole. Next, the riser pipe is inserted into the riser receiving opening of the manhole, and then the cover is connected to the top of the riser pipe. After that, mortar is filled into the inside of the manhole and backfilled up to the upper edge of the cover of the riser pipe.

[0005] However, the manhole rehabilitation method described in Patent Document 1 requires that when installing the manhole body (corresponding to a riser pipe) into the manhole, the bottom of the manhole body and the existing inflow and outflow pipes be leveled within the limited space of the manhole. Therefore, the manhole rehabilitation method described in Patent Document 1 has the problem that it cannot be applied when the inflow and outflow pipes in the manhole are at different heights.

[0006] Furthermore, the manhole rehabilitation method described in Patent Document 1 involves attaching a connecting pipe to the inlet pipe of the manhole, inserting the inlet-side receiving portion of the manhole body into the connecting pipe, while simultaneously pulling out the collar of the collared connecting pipe attached to the outlet pipe of the manhole and inserting it into the outlet-side insertion portion of the manhole body. Therefore, the manhole rehabilitation method described in Patent Document 1 has the problem that, within the limited space of the manhole, the outlet-side insertion portion of the manhole body, which has been installed in the manhole beforehand, must be aligned and joined with the outlet pipe of the manhole. In other words, the manhole rehabilitation method described in Patent Document 1 requires at least a large connection allowance between the outlet pipe of the manhole and the outlet-side insertion portion of the manhole body. Therefore, the manhole rehabilitation method described in Patent Document 1 has the problem that the outer diameter of the manhole body cannot be increased and that the workability is poor. In addition, the manhole rehabilitation method described in Patent Document 1 has the problem that it cannot be applied when the outer diameter is relatively small, such as with a manhole body.

[0007] While existing manholes and drains are pre-equipped with inlets and outlets, the connection angles and number of connections for inlet and outlet pipes differ for each burial site of manholes and drains that require rehabilitation (repair). Therefore, the manhole rehabilitation method described in Patent Document 1 requires the preparation of multiple manhole bodies (rise pipes) for each site, which results in high manufacturing costs.

[0008] Therefore, the present invention aims to provide a manhole or manhole rehabilitation member and rehabilitation method that can easily rehabilitate (repair) existing manholes and manholes, is highly versatile, and reduces costs. [Means for solving the problem]

[0009] (1) The present invention, provided to solve the above-mentioned problems, is a manhole or pit rehabilitation member for a manhole or pit having an inlet and an outlet, comprising: a riser pipe that can be erected inside the manhole or pit; at least one riser pipe side inlet drilled in the circumferential wall of the riser pipe; at least one riser pipe side outlet drilled in the circumferential wall of the riser pipe below the riser pipe side inlet; an invert installed at the lower end of the riser pipe; an inlet side joint attached to the riser pipe side inlet so as to protrude to the outside of the riser pipe; an outlet side joint attached to the riser pipe side outlet so as to protrude to the outside of the riser pipe; and joint members fitted around the outer circumference of the inlet side joint and the outlet side joint, respectively, wherein the invert is positioned below the height of the lower end of the opening of the riser pipe side outlet The joint members are positioned at a height above the lower end of the opening of the mouth, and at least one of the joint members is slidable along the inlet-side joint or the outlet-side joint corresponding to the joint member, and the inlet-side joint and the outlet-side joint are connected to the inlet and outlet, respectively, via the joint members when the riser pipe is erected inside the manhole or pit, and each joint member is joined by abutting against the periphery of the inlet and outlet on the inner circumferential surface of the manhole or pit when the riser pipe is erected inside the manhole or pit, thereby connecting the inlet-side joint and the inlet, and the outlet-side joint and the outlet, respectively, and creating communication between the inside and outside of the manhole or pit.

[0010] The rehabilitation member for manholes or pits (also referred to as manholes, etc.) of the present invention has an invert cast into the lower end of the riser pipe, so an invert can be formed inside the manhole, etc. simply by installing the riser pipe in the manhole, etc. In other words, the rehabilitation member for manholes, etc. of the present invention (also simply referred to as the rehabilitation member) can form an invert on the riser pipe outside the manhole, etc., so there is no need to perform work to form the invert inside the manhole, etc. Therefore, the rehabilitation member of the present invention does not require the work of casting the invert in a limited space, so the burden on workers can be greatly reduced. Furthermore, the invert is positioned from a position below the height of the lower end of the opening of the riser pipe side inlet to a position above the height of the lower end of the opening of the riser pipe side outlet. That is, the invert is positioned so as to slope downward from the riser pipe inlet to the riser pipe outlet. Therefore, the rehabilitation member of the present invention can reliably drain wastewater flowing in from the inlet to the outlet without forming an invert on the existing manhole, etc. side.

[0011] Furthermore, the rehabilitation member of the present invention is provided with at least one riser-side inlet and riser-side outlet on the peripheral wall of the riser pipe, and an inlet-side joint and an outlet-side joint are attached to the riser-side inlet and riser-side outlet, respectively, so as to protrude to the outside. In other words, since the inlet-side joint and the outlet-side joint are attached to the riser pipe in advance in the rehabilitation member of the present invention, there is no need to perform joint connection work inside the manhole or the like. Therefore, the rehabilitation member of the present invention can significantly reduce the burden on workers. Here, the positioning of the riser-side inlet and riser-side outlet can be done by appropriate means, for example, by obtaining the positions of the inlet and outlet of the manhole or the like to be constructed by actual measurement, or by obtaining them based on the design.

[0012] Furthermore, the rehabilitation member of the present invention has joint members fitted around the outer circumference of the inlet-side joint and the outlet-side joint, respectively, and at least one of the joint members is slidable along the inlet-side joint or the outlet-side joint corresponding to the joint member. The joint members are joined by abutting against the inlet and outlet on the inner surface of the manhole, etc., when the riser pipe is erected inside the manhole, etc., thereby connecting the inlet-side joint and the inlet, and the outlet-side joint and the outlet, respectively, and creating communication between the inside and outside of the manhole, etc. Therefore, the rehabilitation member of the present invention allows for easy pipe connection of the riser pipe to an existing manhole with minimal work involving the sliding of the joint members and joining to the inner surface of the manhole, etc., thus significantly reducing the burden on workers. In addition, the joint members also function as seals, so they can suppress water leakage and ingress at the connection points between the inlet and outlet and the inlet-side joint and the outlet-side joint.

[0013] Here, the joint member is preferably made of an elastic material such as rubber. This allows the joint member to be joined to the inner surface of a manhole, etc., even if the radius of curvature of the attachment part of the joint member differs from the radius of curvature of the inner surface of a manhole, etc., thus reducing the burden on workers during joining and improving versatility. Furthermore, by making the joint member of an elastic material, improved seismic resistance can be expected (for example, it can absorb the shock and displacement that occurs in the pipeline when an earthquake occurs). Here, the elastic material used for the joint member is usually rubber, but synthetic rubber is preferred. Furthermore, when synthetic rubber is used for the joint member, it is more preferable to use SBR (styrene-butadiene rubber), NBR (acrylonitrile-butadiene rubber), or EPDM (ethylene-propylene-diene rubber). In addition, the rehabilitation member of the present invention can connect the inlet-side joint and the inlet, and the outlet-side joint and the outlet, by sliding the joint member against the inlet-side joint or the outlet-side joint, so that workability can be ensured while minimizing the connection allowance. Therefore, the rehabilitation member of the present invention can be applied to manholes and other structures with small pipe diameters, and the diameter of the riser can be increased. As a result, the rehabilitation member of the present invention can minimize the reduction in drainage volume of manholes and the like after rehabilitation.

[0014] Here, the connection between the mounting portion and the inner surface of the manhole, etc., can be made using adhesive or sealant. The joint member may be designed so that both the inlet and outlet sides slide, or so that only one side slides. If only one side of the joint member slides, the fixed joint member should be joined to the inner surface of the manhole, etc., and the other joint member should be slid and joined to the inner surface of the manhole, etc., using the joined joint member as a reference. The number of joint members can be provided in appropriate quantities according to the number of inlets and outlets.

[0015] (2) The rehabilitation member for a manhole or pit according to the present invention described above is characterized in that the inlet-side joint and the outlet-side joint each comprise a tubular portion and a saddle portion connected to the base end of the tubular portion, the tubular portion being insertable into the riser-side inlet or riser-side outlet from the inner circumference of the riser, the saddle portion being curved so as to be in contact with the inner circumference of the riser, and the tubular portion being joined with the saddle portion in contact with the inner circumference of the riser, thereby connecting the inside and outside of the manhole or pit.

[0016] The manhole or sill rehabilitation member of the present invention, when configured as described in (2) above, allows for easy construction of the inlet-side joint and outlet-side joint on the riser pipe in advance of work inside the manhole or sill (hereinafter also referred to as "manhole, etc."). Furthermore, the manhole, etc. rehabilitation member of the present invention allows for the connection of the inlet-side joint and outlet-side joint to the riser pipe in advance outside the manhole, etc., thus ensuring work efficiency and enabling more reliable connection of the inlet-side joint and outlet-side joint to the riser pipe. The connection between the inner circumferential surface of the manhole, etc. and the saddle portion can be made, for example, by adhesive or screws, and it is preferable to suppress water leakage by using a sealant or the like as appropriate. In addition, it is preferable that the radius of curvature of the saddle portion be formed to be the same as the radius of curvature of the inner circumferential surface of the riser pipe. As a result, the manhole, etc. rehabilitation member of the present invention can closely connect the saddle portion and the inner circumferential surface of the riser pipe, thereby more reliably suppressing water leakage and ingress.

[0017] (3) In the manhole or pit rehabilitation member of the present invention described above, the joint member is characterized in that it has a joint opening that allows the inlet-side joint or the outlet-side joint to slide and be inserted, and a mounting portion formed in at least a part of the periphery of the joint opening and that can be joined to the inner circumferential surface of the manhole or pit, and that by joining the mounting portion to the inner circumferential surface of the manhole or pit, it is possible to seal the space between the inlet-side joint and the inlet, and the space between the outlet-side joint and the outlet.

[0018] The manhole or septic tank rehabilitation member of the present invention, when configured as described in (3) above, allows for easy joining of the mounting portion to the inner surface of the manhole or the like by sliding the joint member along the inlet-side joint or the outlet-side joint. Furthermore, the manhole or the like rehabilitation member of the present invention can seal the space between the inlet-side joint and the inlet, and between the outlet-side joint and the outlet, thereby suppressing water leakage and ingress between the inlet-side joint and the inlet, and between the outlet-side joint and the outlet. In other words, a wide tolerance range for joining the inlet-side joint and the inlet, and between the outlet-side joint and the outlet can be secured, thus reducing the workload.

[0019] (4) The rehabilitation member for a manhole or pit according to the present invention described above is characterized in that the riser pipe side outlet is formed in advance in accordance with the position of the outlet prior to the riser pipe being erected inside the manhole or pit, and the riser pipe side inlet is formed before the riser pipe is erected inside the manhole or pit, and after the riser pipe side outlet is formed.

[0020] The manhole or drainage box rehabilitation member of the present invention, when configured as described in (4) above, can be used as a reference to the outlet which is normally located on the lower side, and the position of the perforation (formation) of the inlet on the riser side can be efficiently positioned using the lower end of the riser as a reference.

[0021] (5) A method for rehabilitating a manhole or pit provided in order to solve the above-mentioned problems is a method for rehabilitating a manhole or pit equipped with an inlet and an outlet, comprising: preparing a riser pipe that can be erected inside the manhole or pit; an existing invert removal step of removing an existing invert inside the manhole or pit; a first drilling step of drilling either a riser pipe side inlet or a riser pipe side outlet in the peripheral wall of the riser pipe; a second drilling step of drilling the riser pipe side outlet and the remaining of the riser pipe side outlet prior to installing the riser pipe inside the manhole or pit; a riser pipe joint installation step of attaching a corresponding tubular inlet-side joint or outlet-side joint to the riser pipe side inlet and the riser pipe side outlet so as to protrude to the outside of the riser pipe, respectively; and The method is characterized by performing the following steps: an invert installation step of installing an invert at the lower end of the riser pipe; a joint member installation step of fitting joint members onto the outer circumference of the inlet-side joint and the outlet-side joint, respectively; a riser pipe installation step of erecting the riser pipe inside the manhole or pit; a joint connection preparation step of bringing the inlet-side joint and the outlet-side joint close to or in contact with the inlet and the outlet, respectively; and a joint connection step of moving each of the joint members toward the inner surface of the manhole or pit and bringing them into contact with the periphery of the inlet and the outlet on the inner surface to connect the inlet-side joint and the inlet, and the outlet-side joint and the outlet, respectively, thereby connecting the inside and outside of the manhole or pit.

[0022] The present invention's method for rehabilitating manholes or pits (hereinafter also referred to as the rehabilitation method) involves a process in which the invert is cast at the lower end of the riser pipe prior to the riser pipe installation process. Therefore, the invert can be formed inside the manhole simply by installing the riser pipe. In other words, the present invention's method for rehabilitating manholes allows the invert to be formed on the riser pipe outside the manhole, eliminating the need to perform work to form the invert inside the manhole. Consequently, the present invention's method for rehabilitating manholes eliminates the need to perform invert casting work in a limited space, significantly reducing the burden on workers.

[0023] Also, in the rehabilitation method of the present invention, prior to the riser installation step, the riser side inlet and the riser side outlet are drilled (formed) by the first drilling step and the second drilling step. In the riser joint attachment step, the inlet side joint or the outlet side joint is attached to the riser side inlet and the riser side outlet so as to protrude to the outside, respectively. That is, in the rehabilitation method of the present invention, since the inlet side joint and the outlet side joint are attached to the riser in advance, there is no need to perform connection work of joints inside a manhole or the like. Therefore, the rehabilitation method of the present invention can significantly reduce the burden on the operator. Here, the positioning of the riser side inlet and the riser side outlet in the first drilling step and the second drilling step can be performed by appropriate means such as obtaining the positions of the inlet and the outlet of a manhole or the like to be constructed by actual measurement or obtaining them based on the design.

[0024] Also, in the rehabilitation method of the present invention, in the joint connection step, with the riser erected inside a manhole or the like, the joint member is abutted and joined around the inlet and the outlet on the inner peripheral surface of the manhole or the like, thereby connecting the inlet side joint and the inlet, and the outlet side joint and the outlet, respectively, to communicate the inside and the outside of the manhole or the like. Therefore, the rehabilitation method of the present invention can easily perform piping connection of the riser to the existing manhole with a minimum amount of work of sliding the joint member and joining it to the inner peripheral surface of the manhole or the like, so that the burden on the operator can be significantly reduced. Further, since the joint member also functions as a seal, water leakage and flooding can be suppressed at the connection portion between the inlet and the outlet and the inlet side joint and the outlet side joint.

[0025] Here, it is preferable that the joint member is composed of an elastic member such as rubber. Thereby, even if the radius of curvature of the mounting portion of the joint member is different from the radius of curvature of the inner peripheral surface of a manhole or the like, the joint member can be joined to the inner peripheral surface of a manhole or the like. Therefore, it is possible to reduce the burden on the operator during joining and improve versatility. Further, in the rehabilitation method of the present invention, the inflow-side joint or the outflow-side joint of the joint member can be slid to connect the inflow-side joint and the inflow port, and the outflow-side joint and the outflow port. Therefore, workability can be ensured while minimizing the connection cost. Therefore, the rehabilitation method of the present invention can be applied not only to a small-diameter barrel or manhole but also to a large-diameter riser pipe. Thereby, the rehabilitation method of the present invention can minimize the reduction in the drainage volume of a manhole or the like after rehabilitation.

[0026] Here, the joining of the joint member and the inner peripheral surface of a manhole or the like in the joint connection step may be performed using an adhesive, a sealing material, or the like. Further, the joint member may be one in which both the inflow side and the outflow side slide, or one in which only one side slides. When only one side of the joint member slides, the fixed-side joint member is joined to the inner peripheral surface of a manhole or the like, and with reference to the joined-side joint member, the other-side joint member is slid and joined to the inner peripheral surface of a manhole or the like. Note that the joint member can be provided in an appropriate quantity according to the quantity of provided inflow ports, outflow ports, or the like.

[0027] (6) In the method for rehabilitating the barrel or manhole of the present invention described above, it is preferable that the invert casting step is performed by casting an invert from a position that is the same as or lower than the lower end of the opening of the riser-side inflow port to a position that is the same as or higher than the lower end of the opening of the riser-side outflow port.

[0028] The present invention provides a method for rehabilitating a manhole or drain, in which the invert is positioned from a position below the height of the lower end of the opening of the riser pipe inlet to a position above the height of the lower end of the opening of the riser pipe outlet. In other words, in the rehabilitation method of the present invention, the invert is positioned to slope downward from the riser pipe inlet to the riser pipe outlet. Therefore, the rehabilitation method of the present invention can reliably drain wastewater flowing in from the inlet to the outlet without forming an invert on the existing manhole or the like.

[0029] (7) The method for rehabilitating a manhole or pit according to the present invention described above is characterized in that, in the joint member attachment step, the joint member is slidably attached to the inlet-side joint or the outlet-side joint, and in the joint connection step, the joint member is slid toward the inner circumferential surface of the manhole or pit, and then joined by contacting the inner circumferential surface, thereby sealing the space between the inlet-side joint and the inlet, and the space between the outlet-side joint and the outlet.

[0030] The rehabilitation member for manholes or drains of the present invention, when configured as described in (7) above, allows the joint member to be easily joined to the inner surface of a manhole or the like by sliding the joint member along the inlet-side joint or the outlet-side joint. Furthermore, the rehabilitation method of the present invention can seal the space between the inlet-side joint and the inlet, and between the outlet-side joint and the outlet, thereby suppressing water leakage and ingress between the inlet-side joint and the inlet, and between the outlet-side joint and the outlet. In other words, a wide tolerance range for joining the inlet-side joint and the outlet, and between the outlet-side joint and the outlet can be secured, thus reducing the workload.

[0031] (8) The method for rehabilitating a manhole or drain box according to the present invention described above is characterized in that the first drilling step is to drill a riser pipe side outlet in the circumferential wall of the riser pipe, and the second drilling step is to drill a riser pipe side inlet in the circumferential wall of the riser pipe, with the position of the riser pipe side outlet as the reference.

[0032] By configuring the manhole or drainage box rehabilitation member of the present invention as described in (8) above, the outlet, which is normally located on the lower side, can be used as a reference, and the position of the perforation (formation) of the inlet on the riser side can be efficiently positioned using the lower end of the riser as a reference.

[0033] (9) The method for rehabilitating a manhole or basin according to the present invention described above is characterized in that the inlet-side joint and the outlet-side joint are provided with a tubular portion and a saddle portion connected to the base end side of the tubular portion, and the riser joint installation step is characterized in that the riser joint insertion step is performed by inserting the tubular portion through the riser-side inlet or riser-side outlet from the inner circumference side of the riser, and the riser joint joining step is performed by bringing the saddle portion into contact with the inner circumference surface of the riser and joining them.

[0034] The rehabilitation method for manholes or pits of the present invention, when configured as described in (8) above, allows for the easy construction of inlet-side joints and outlet-side joints on the riser pipe in advance. Therefore, the rehabilitation method of the present invention eliminates the need to connect the riser pipe to the inlet-side joints and outlet-side joints inside the manhole or pit, thus significantly reducing the burden on workers. [Effects of the Invention]

[0035] According to the present invention, it is possible to provide a rehabilitation member and rehabilitation method for existing manholes or pits that can be rehabilitated (repaired) with good workability, is highly versatile, and reduces costs. [Brief explanation of the drawing]

[0036] [Figure 1] This is a front cross-sectional view of one embodiment of a manhole or box rehabilitation member of the present invention. [Figure 2] This is an enlarged cross-sectional view of the riser pipe shown in Figure 1. [Figure 3] (a) is a partially broken front view of an inlet-side joint or outlet-side joint constituting a rehabilitation member of the present invention, and (b) is a partially broken right side view. [Figure 4](a) is a plan view of the joint member constituting the rehabilitation member of the present invention, (b) is a right side view, and (c) is a partially broken front view. [Figure 5] Figures (a) through (g) are diagrams illustrating, step by step, the rehabilitation method for manholes or sills using rehabilitation members. [Figure 6] This diagram illustrates, step by step, a method for rehabilitating a manhole or sill using rehabilitation materials. [Figure 7] (a) and (b) are diagrams illustrating, step by step, the method of rehabilitating a manhole or sill using rehabilitation materials. [Figure 8] (a) and (b) are diagrams illustrating, step by step, the method of rehabilitating a manhole or sill using rehabilitation materials. [Modes for carrying out the invention]

[0037] The following describes in detail a rehabilitation member 1 according to one embodiment of the present invention, with reference to the drawings. Please note that the figures are schematic representations for ease of understanding and may differ from the actual shape, size, and arrangement of components. Also, please note that hatching in the cross-section may be omitted in some figures.

[0038] As shown in Figure 1, the rehabilitation member 1 is intended to be used for the rehabilitation (repair) of a manhole or sill M. In this embodiment, the case in which the rehabilitation member 1 is applied to an existing manhole M will be explained as an example.

[0039] The manhole M described here is an existing, aging manhole. The manhole M has, for example, an inner diameter that conforms to standards, and for example, allows workers to enter inside. As shown in Figure 5(a), the manhole M has an invert 7 (for convenience of explanation, also referred to as the existing invert 7) installed at its bottom. The manhole M also has an inlet 3 and an outlet 5. In this embodiment, the inlet 3 is located above the outlet 5. A sloping wall 9 is also provided at the top of the manhole M. Appropriate piping is connected to the inlet 3 and the outlet 5, respectively.

[0040] As shown in Figure 1, the rehabilitation member 1 includes a riser pipe 10, an inlet-side joint 30A, an outlet-side joint 30B, and a joint member 40, etc.

[0041] As shown in Figures 1 and 2, the riser pipe 10 is designed to be erected inside the manhole M and is formed as a cylindrical tube. The riser pipe 10 is formed with a diameter slightly smaller than the inner diameter of the manhole M and with an outer diameter that does not interfere with the connection of the riser pipe side inlet 12 and riser pipe side outlet 14, which will be described later. The riser pipe 10 is made of, for example, polyvinyl chloride resin. The material constituting the riser pipe 10 is not particularly limited and can be made of various materials, including various known resin materials such as plastics. A sleeve pipe 8 (see Figure 1) is attached to the upper part of the riser pipe 10. In addition, at least one (one in this embodiment) riser pipe side inlet 12 and at least one (one in this embodiment) riser pipe side outlet 14 are perforated (formed) in the peripheral wall of the riser pipe 10. As shown in Figure 2, a bottom plate 10A is provided at the lower end of the riser pipe 10. Furthermore, an invert 20 is cast (formed) at the lower end of the riser pipe 10 (on the bottom plate 10A). Note that the bottom plate 10A can be removed as needed when erecting the riser pipe in the manhole M (in this embodiment, the riser pipe 10 is erected in the manhole M with the bottom plate 10A in place).

[0042] The riser pipe inlet 12 is drilled in a circular shape to correspond to the inlet 3 of the manhole M. An inlet-side joint 30A, described later, is attached to the riser pipe inlet 12. Drainage from the inlet 3 flows into the riser pipe inlet 12 via the inlet-side joint 30A. The riser pipe inlet 12 is formed to match the position of the inlet 3 of the manhole M, after the position of the inlet 3 has been determined in advance by actual measurement or other means.

[0043] The riser pipe side outlet 14 is formed by perforating a circular hole in the perimeter wall of the riser pipe 10, corresponding to the outlet 5 of the manhole M. The riser pipe side outlet 14 is formed below the riser pipe side inlet 12. The riser pipe side inlet 12 and the riser pipe side outlet 14 can be formed at appropriate positions depending on the positions of the inlet 3 and outlet 5 of the manhole M. An outlet-side joint 30B, described later, is attached to the riser pipe side outlet 14. The riser pipe side outlet 14 can discharge (drain) wastewater that has flowed into the riser pipe 10 via the outlet-side joint 30B. The riser pipe side outlet 14 is formed in accordance with the position of the outlet 5 of the manhole M, after the position of the outlet 5 of the manhole M has been determined in advance by measurement or other means. In this embodiment, the riser pipe side outlet 14 is formed before the riser pipe side inlet 12 is formed. That is, the riser pipe side outlet 14 can be formed with the riser pipe side inlet 12 as the reference. In this embodiment, the riser side outlet 14 is formed at a position rotated 180 degrees relative to the riser side inlet 12.

[0044] As shown in Figure 2, the invert 20 is cast onto the lower end of the riser pipe 10 (on the bottom plate 10A). The invert 20 is made of concrete, mortar, or the like. The invert 20 is positioned from a height below the lower end of the opening of the riser pipe side inlet 12 to a height above the lower end of the opening of the riser pipe side outlet 14. In other words, the invert 20 is positioned to have a downward slope (gradient) from the lower end of the opening of the riser pipe side inlet 12 to the lower end of the opening of the riser pipe side outlet 14. In this embodiment, in order to further improve on-site construction efficiency, the invert 20 is provided with a flat, sloping top surface, for example. The invert 20 may also have a semicircular groove formed on its top surface, for example, to match the radius of curvature of the riser pipe side inlet 12 and the riser pipe side outlet 14. Therefore, the invert 20 can direct (drain) wastewater flowing in from the riser pipe side inlet 12 towards the riser pipe side inlet 12 along the aforementioned sloping gradient. The invert 20 can be installed integrally with the riser pipe 10 inside the manhole M.

[0045] The inlet-side joint 30A and the outlet-side joint 30B (collectively referred to as joint 30) are attached to the riser-side inlet 12 and the riser-side outlet 14, respectively, so as shown in Figure 2, that they protrude from the outside of the riser 10. The inlet-side joint 30A and the outlet-side joint 30B are formed from, for example, polyvinyl chloride resin. The materials constituting the inlet-side joint 30A and the outlet-side joint 30B are not particularly limited, and various materials, including various known resin materials such as plastics, can be used. The inlet-side joint 30A and the outlet-side joint 30B are connected to the inlet 3 and outlet 5 (see Figure 1), respectively, via a joint member 40, which will be described later, when the riser 10 is erected inside the manhole M. In this embodiment, the inlet-side joint 30A and the outlet-side joint 30B have the same configuration. Therefore, unless there is a need to distinguish between them, the inlet-side joint 30A will be described as representative, and the description of the outlet-side joint 30B may be omitted.

[0046] As shown in Figure 3, the inlet-side joint 30A and the outlet-side joint 30B are equipped with a tubular portion 32 and a saddle portion 34.

[0047] The tubular portion 32 is a cylindrical body and is formed to have the same diameter as, or slightly smaller than, the riser pipe side inlet 12 or riser pipe side outlet 14 (see Figure 2). Therefore, the tubular portion 32 can be inserted into the riser pipe side inlet 12 or riser pipe side outlet 14 from the inner circumference side of the riser pipe 10. Furthermore, the tubular portion 32 is formed to have approximately the same diameter as the inlet 3 or outlet 5 of the manhole M, or to have an outer diameter that allows insertion into the inlet 3 or outlet 5. A saddle portion 34 is connected to the base end of the tubular portion 32. In other words, the tubular portion 32 is formed to rise from the saddle portion 34. Furthermore, the tubular portion 32 is formed, for example, by integral molding with the saddle portion 34.

[0048] As shown in Figure 3(b), the saddle portion 34 is curved so as to be able to contact the inner surface of the riser pipe 10. In other words, the saddle portion 34 is formed with the same radius of curvature as the inner surface of the riser pipe 10. As shown in Figure 1, the saddle portion 34 can be joined to the inner surface (circumferential wall) of the riser pipe 10 by inserting the tubular portion 32 through the riser pipe side inlet 12 or the riser pipe side outlet 14. Therefore, the tubular portion 32 can connect the inside and outside of the manhole M when joined to the inner surface of the riser pipe 10 by contacting the saddle portion 34. Here, the joining of the saddle portion 34 to the inner surface of the riser pipe 10 can be done, for example, by screwing with a sealing material or by adhesive. It is desirable that the joining of the saddle portion 34 to the inner surface of the riser pipe 10 be sealed to prevent water leakage or ingress.

[0049] As shown in Figures 4(a) to 4(c), the joint member 40 has a joint opening 42 that allows the inlet-side joint 30A or the outlet-side joint 30B to slide and be inserted, and a mounting portion 44 formed in at least a part of the area around the joint opening 42 and that can be joined to the inner circumferential surface of the manhole M. The joint member 40 can be fitted onto the outer circumference of the inlet-side joint 30A and the outlet-side joint 30B, respectively. The joint member 40 is made of an elastic material such as rubber. At least one of the joint members 40 (both in this embodiment) is slidable along the inlet-side joint 30A or the outlet-side joint 30B that corresponds to the joint member 40.

[0050] As shown in Figure 1, each joint member 40,40 can be joined by abutting against the periphery of the inlet 3 and outlet 5 on the inner circumferential surface of the manhole M while the riser pipe 10 is erected inside the manhole M, thereby connecting the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5, respectively. This allows the joint members 40,40 to communicate the inside and outside of the manhole M. Furthermore, by joining the mounting portions 44,44 of the joint members 40,40 to the inner circumferential surface of the manhole M, the spaces between the inlet-side joint 30A and the inlet 3, and between the outlet-side joint 30B and the outlet 5, can be sealed.

[0051] The above describes the configuration of the rehabilitation member 1 for the manhole or box M of the present invention. Next, the effects and benefits realized by the rehabilitation member 1 of the present invention will be explained below.

[0052] (a) The rehabilitation member 1 for a manhole or pit M of the present invention is a rehabilitation member 1 for a manhole or pit M having an inlet 3 and an outlet 5, comprising: a riser pipe 10 that can be erected inside the manhole or pit M; at least one riser pipe side inlet 12 drilled in the circumferential wall of the riser pipe 10; at least one riser pipe side outlet 14 drilled in the circumferential wall of the riser pipe 10 below the riser pipe side inlet 12; an invert 20 cast into the lower end of the riser pipe 10; an inlet side joint 30A attached to the riser pipe side inlet 12 so as to protrude to the outside of the riser pipe 10; an outlet side joint 30B attached to the riser pipe side outlet 14 so as to protrude to the outside of the riser pipe 10; and joint members 40 fitted around the outer circumference of the inlet side joint 30A and the outlet side joint 30B, respectively, wherein the invert 20 allows the riser pipe side flow from a position below the height of the lower end of the opening of the riser pipe side inlet 12 The joint members 40 are arranged at a height above the lower end of the opening of the outlet 14, and at least one of the joint members 40 is slidable along the inlet-side joint 30A or outlet-side joint 30B that corresponds to the joint member 40. The inlet-side joint 30A and outlet-side joint 30B are connected to the inlet 3 and outlet 5, respectively, via the joint members 40 when the riser pipe 10 is erected inside the manhole or pit, and the joint members 40, 40 are joined by abutting against the periphery of the inlet 3 and outlet 5 on the inner circumferential surface of the manhole or pit when the riser pipe 10 is erected inside the manhole or pit, thereby connecting the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5, respectively, and creating communication between the inside and outside of the manhole or pit.

[0053] The rehabilitation member 1 for manholes or pits M (also referred to as manhole M, etc.) of the present invention has an invert 20 cast into the lower end of the riser pipe 10, so the invert 20 can be formed inside the manhole M, etc. simply by installing the riser pipe 10 in the manhole M, etc. In other words, the rehabilitation member 1 for manholes M, etc. of the present invention (also simply referred to as rehabilitation member 1) can form the invert 20 on the riser pipe 10 outside the manhole M, etc., so there is no need to perform work to form the invert 20 inside the manhole M, etc. Therefore, the rehabilitation member 1 of the present invention does not require the work of casting the invert 20 in a limited space, so the burden on workers can be greatly reduced. Furthermore, the invert 20 is positioned from a position below the height of the lower end of the opening of the riser pipe side inlet 12 to a position above the height of the lower end of the opening of the riser pipe side outlet 14. That is, the invert 20 is positioned so as to slope downward from the riser pipe side inlet 12 to the riser pipe side outlet 14. Therefore, the rehabilitation member 1 of the present invention can reliably drain wastewater flowing in from the inlet 3 to the outlet 5 without forming an invert 20 on the side of the existing manhole M, etc.

[0054] Furthermore, the rehabilitation member 1 of the present invention is provided with at least one vertical pipe-side inlet 12 and a vertical pipe-side outlet 14 on the peripheral wall of the vertical pipe 10, and an inlet-side joint 30A and an outlet-side joint 30B are attached to the vertical pipe-side inlet 12 and vertical pipe-side outlet 14, respectively, so as to protrude to the outside. In other words, since the rehabilitation member 1 of the present invention has the inlet-side joint 30A and the outlet-side joint 30B attached to the vertical pipe 10 in advance, there is no need to perform joint connection work inside the manhole M or the like. Therefore, the rehabilitation member 1 of the present invention can significantly reduce the burden on workers. Here, the positioning of the vertical pipe-side inlet 12 and the vertical pipe-side outlet 14 can be done by appropriate means, such as obtaining the positions of the inlet 3 and outlet 5 of the manhole M or the like to be constructed by actual measurement, or by obtaining them based on the design.

[0055] Furthermore, the rehabilitation member 1 of the present invention has joint members 40, 40 fitted around the outer circumference of the inlet-side joint 30A and the outlet-side joint 30B, respectively, and at least one of the joint members 40, 40 is slidable along the inlet-side joint 30A or the outlet-side joint 30B that corresponds to the joint member 40. In addition, the joint members 40, 40 are joined by abutting against the inlet 3 and outlet 5 on the inner surface of the manhole M, etc., when the riser pipe 10 is erected inside the manhole M, etc., thereby connecting the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5, respectively, and creating communication between the inside and outside of the manhole M, etc. Therefore, the rehabilitation member 1 of the present invention allows for easy pipe connection of the riser pipe 10 to an existing manhole M with minimal work involving the sliding of the joint members 40, 40 and joining to the inner surface of the manhole M, etc., thus significantly reducing the burden on workers. Furthermore, since the joint members 40, 40 also function as seals, they can suppress water leakage and ingress at the connection points between the inlet 3 and outlet 5 and the inlet-side joint 30A and the outlet-side joint 30B.

[0056] Here, the joint member 40 is preferably made of an elastic material such as rubber. This allows the joint member 40 to be joined to the inner surface of the manhole M, even if the radius of curvature of the attachment portion 44 of the joint member 40 differs from the radius of curvature of the inner surface of the manhole M, thus reducing the burden on workers during joining and improving versatility. Furthermore, by making the joint member out of an elastic material, improved seismic resistance can be expected (for example, it can absorb the shock and displacement that occurs in the pipeline during an earthquake). Here, the elastic material used for the joint member is usually rubber, but it is preferable to use synthetic rubber. Moreover, when using synthetic rubber for the joint member, it is even more preferable to use SBR (styrene-butadiene rubber), NBR (acrylonitrile-butadiene rubber), or EPDM (ethylene-propylene-diene rubber). Furthermore, the rehabilitation member 1 of the present invention can connect the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5 by sliding the joint member 40 against the inlet-side joint 30A or the outlet-side joint 30B, thus ensuring workability while minimizing the connection allowance. Therefore, the rehabilitation member 1 of the present invention can be applied to manholes and pits with small pipe diameters, and the diameter of the riser pipe 10 can be made larger. As a result, the rehabilitation member 1 of the present invention can minimize the reduction in drainage volume of manholes M and the like after rehabilitation.

[0057] Here, the connection between the mounting portion 44 and the inner surface of the manhole M, etc., can be made using adhesive or sealant. The joint members 40, 40 may be designed so that both the inlet and outlet sides slide, or only one side slides. If only one side of the joint members 40, 40 slides, the fixed joint member 40 is joined to the inner surface of the manhole M, etc., and the other joint member 40 is slid and joined to the inner surface of the manhole M, etc., using the joined joint member 40 as a reference. The number of joint members 40 can be provided in appropriate quantities according to the number of inlets 3 and outlets 5, etc.

[0058] (b) The rehabilitation member 1 for a manhole or pit M of the present invention described above, wherein the inlet-side joint 30A and the outlet-side joint 30B each comprise a tubular portion 32 and a saddle portion 34 connected to the base end of the tubular portion 32, wherein the tubular portion 32 can be inserted into the riser-side inlet 12 or riser-side outlet 14 from the inner circumference side of the riser 10, the saddle portion 34 is curved so as to be in contact with the inner circumference surface of the riser 10, and the tubular portion 32 connects the inside and outside of the manhole or pit M when the saddle portion 34 is in contact with the inner circumference surface of the riser 10 and joined together.

[0059] The manhole or pit rehabilitation member 1 of the present invention, when configured as described in (b) above, allows for easy construction of the inlet-side joint 30A and outlet-side joint 30B on the riser pipe 10 in advance of work inside the manhole or pit (hereinafter also referred to as manhole M, etc.). Furthermore, the manhole or pit rehabilitation member 1 of the present invention allows for the connection of the inlet-side joint 30A and outlet-side joint 30B to the riser pipe 10 in advance outside the manhole M, etc., thus ensuring work efficiency and enabling more reliable connection between the inlet-side joint 30A and outlet-side joint 30B and the riser pipe 10. The connection between the inner circumferential surface of the manhole M, etc. and the saddle portion 34 can be made, for example, by adhesive or screws, and it is preferable to suppress water leakage by using a sealing material as appropriate. In addition, it is preferable that the radius of curvature of the saddle portion 34 be formed to be the same as the radius of curvature of the inner circumferential surface of the riser pipe 10. As a result, the rehabilitation member 1 of the present invention, such as the manhole M, can be brought into close contact with the saddle portion 34 and the inner circumferential surface of the riser pipe 10, thereby more reliably suppressing water leakage and inundation.

[0060] (c) In the rehabilitation member 1 for a manhole or box M of the present invention described above, the joint member 40 has a joint opening 42 that opens so that an inlet-side joint 30A or an outlet-side joint 30B can slide and be inserted into it, and a mounting portion 44 formed in at least a part of the area around the joint opening 42 and that can be joined to the inner circumferential surface of the manhole or box M, wherein by joining the mounting portion 44 to the inner circumferential surface of the manhole or box M, it is possible to seal the space between the inlet-side joint 30A and the inlet 3, and the space between the outlet-side joint 30B and the outlet 5.

[0061] The rehabilitation member 1 for a manhole or drain box M of the present invention, when configured as described in (c) above, allows the joint member 40 to slide along the inlet-side joint 30A or the outlet-side joint 30B, thereby easily joining the mounting portion 44 to the inner surface of the manhole M or the like. Furthermore, the rehabilitation member 1 for a manhole M or the like of the present invention can seal the space between the inlet-side joint 30A and the inlet 3, and between the outlet-side joint 30B and the outlet 5, thereby suppressing water leakage and ingress between the inlet-side joint 30A and the inlet 3, and between the outlet-side joint 30B and the outlet 5. In other words, a wide tolerance range for joining the inlet-side joint 30A and the inlet 3, and between the outlet-side joint 30B and the outlet 5 can be secured, thus reducing the workload.

[0062] (d) The rehabilitation member 1 for a manhole or pit M of the present invention described above is characterized in that the riser pipe side outlet 14 is formed in advance in accordance with the position of the outlet 5 prior to the riser pipe 10 being erected inside the manhole or pit M, and the riser pipe side inlet 12 is formed before the riser pipe 10 is erected inside the manhole or pit M and after the riser pipe side outlet 14 is formed.

[0063] The rehabilitation member 1 for a manhole or septic tank M of the present invention, when configured as described in (d) above, can be used as a reference to the outlet 5 which is normally located on the lower side, and the position of the perforation (formation) of the riser pipe side inlet 12 can be efficiently positioned using the lower end of the riser pipe 10 as a reference.

[0064] The above describes the effects and advantages of the manhole or box rehabilitation member 1 of the present invention. However, the manhole or box rehabilitation member 1 of the present invention is not limited to the embodiments or modifications described above, and can be modified in various ways within the scope of the present invention. For example, the manhole or box rehabilitation member 1 of the present invention may be as described in (a) above, and can be formed in various shapes and sizes. Furthermore, the manhole or box rehabilitation member 1 of the present invention may, for example, not have some or all of the components described in (b) to (d) above, or may have some or all of the components described in (b) to (d) above, and other components.

[0065] Next, an embodiment of a method for rehabilitating a manhole or box using the rehabilitation member 1 of the present invention will be described in detail below with reference to Figures 5 to 8.

[0066] In the rehabilitation method of the present invention, as shown in Figure 5(a), rehabilitation (repair) work is carried out on an existing manhole M. Also, as shown in Figure 5(d), a riser pipe 10 that can be erected inside the manhole M is prepared in advance. In this embodiment, the riser pipe 10 is prepared in an unperforated state in the initial condition.

[0067] At the start of the rehabilitation work, as shown in Figure 5(b), the ground G around the manhole M is excavated and the sloping wall 9 of the manhole M is removed. Subsequently, as shown in Figure 5(c), the existing invert 7 at the bottom of the manhole M is removed by excavation (existing invert removal process). The existing invert removal process may be performed only if necessary, and it is also possible to omit the existing invert removal process. Furthermore, in the existing invert removal process, the opening formed at the bottom of the manhole M may be closed off with an appropriate plate material (for example, a flat plate, a donut-shaped ring plate, etc.) as necessary. Also, the manhole M may not have an opening on the lower side of the existing invert 7.

[0068] Next, as shown in Figure 5(d), a riser pipe side outlet 14 is drilled in the circumferential wall (inner surface) of the riser pipe 10 at a position corresponding to the outlet 5 (first drilling step). Once the first drilling step is performed, prior to installing the riser pipe 10 inside the manhole M, a riser pipe side inlet 12 is drilled at a position corresponding to the inlet 3 (second drilling step). In the second drilling step, the riser pipe side inlet 12 is drilled in the circumferential wall of the riser pipe 10 based on the positional relationship determined by actual measurement or design, with the position of the riser pipe side outlet 14 as the reference.

[0069] Next, as shown in Figure 5(e), corresponding tubular inlet-side fittings 30A or outlet-side fittings 30B are attached to the riser-side inlet 12 and the riser-side outlet 14, respectively, so as to protrude to the outside of the riser 10 (riser-side fitting installation process). In other words, in the riser-side fitting installation process, a tubular inlet-side fitting 30A is attached to the riser-side inlet 12 from the inside of the riser 10 toward the outside, and a tubular inlet-side fitting 30A is attached to the riser-side outlet 14 from the inside of the riser 10 toward the outside. Also, in the riser-side fitting installation process, the tubular portion 32 of the inlet-side fitting 30A is inserted through the riser-side inlet 12 from the inner circumference of the riser 10, and the tubular portion 32 of the outlet-side fitting 30B is inserted through the riser-side outlet 14 from the inside of the riser 10 (riser-side fitting insertion process). Furthermore, in the riser pipe joint installation process, the saddle portions 34, 34 of the inlet-side joint 30A and the outlet-side joint 30B are brought into contact with the inner circumferential surface (inner circumferential wall) of the riser pipe 10 and joined together (riser pipe joint joining process).

[0070] Next, as shown in Figure 5(f), an invert 20 is cast into the lower end (bottom) of the riser pipe 10 (invert casting process). In the invert casting process, the invert 20 is cast from a position equal to or lower than the lower end of the opening of the riser pipe side inlet 12 to a position equal to or higher than the lower end of the opening of the riser pipe side outlet 14. In other words, in the invert casting process, the invert 20 is positioned (cast) from a position below the height of the lower end of the opening of the riser pipe side inlet 12 to a position above the height of the lower end of the opening of the riser pipe side outlet 14. To put it another way, in the invert casting process, the invert 20 is positioned (cast) so as to have a downward slope (gradient) from the riser pipe side inlet 12 to the riser pipe side outlet 14. In addition, for example, a semicircular groove is formed on the upper surface of the invert 20 so as to have a downward slope from the riser pipe side inlet 12 to the riser pipe side outlet 14.

[0071] Next, as shown in Figure 5(g), joint members 40 are fitted onto the outer circumference of the inlet-side joint 30A and the outlet-side joint 30B, respectively (joint member installation step). In the joint member installation step, the joint members 40, 40 are slidably attached to the inlet-side joint 30A or the outlet-side joint 30B.

[0072] Next, as shown in Figure 6(a), the riser pipe 10 is erected inside the manhole M (riser pipe installation process). In this embodiment, the riser pipe 10 with the invert 20 installed is erected so as to close the opening at the bottom of the manhole M where the existing invert 7 has been removed.

[0073] Next, as shown in Figure 7(a), the inlet-side joint 30A and the outlet-side joint 30B are moved so as to approach or come into contact with the corresponding inlet 3 and outlet 5, respectively (joint connection preparation step). Following the joint connection preparation step, the respective joint members 40, 40 are moved toward the inner circumferential surface of the manhole M and joined around the inlet 3 and outlet 5 on the inner circumferential surface. The joint members 40, 40 then connect the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5, respectively, creating communication between the inside and outside of the manhole M (joint connection step). In the joint connection step, the joint members 40, 40 are slid toward the inner circumferential surface of the manhole M and then brought into contact with the inner circumferential surface to join them, thereby sealing the space between the inlet-side joint 30A and the inlet 3, and between the outlet-side joint 30B and the outlet 5.

[0074] Next, as shown in Figure 7(b), the sleeve pipe 8 is inserted into the upper part of the riser pipe 10. Then, as shown in Figure 8(a), mortar 50 is filled between the inner circumference (inner wall) of the manhole M and the riser pipe 10 (including the sleeve pipe 8). Once the mortar 50 is filled, the unnecessary upper part of the sleeve pipe 8 is cut off and removed.

[0075] Next, as shown in Figure 8(b), the sloping wall 9 is connected to the top of the manhole M, and the area around the manhole M is filled with soil and other materials. This completes the rehabilitation (repair) of the manhole M.

[0076] The above describes the method for rehabilitating a manhole or pit according to the present invention. Next, the effects and advantages realized by the method for rehabilitating a manhole or pit according to the present invention will be explained below. The method for rehabilitating a manhole or pit according to the present invention can achieve unique effects and advantages by having the following configurations (e) to (i).

[0077] (e) The present invention provides a method for rehabilitating a manhole or pit M having an inlet 3 and an outlet 5, wherein a riser pipe 10 that can be erected inside the manhole or pit M is prepared, and the method comprises: an existing invert removal step of removing an existing invert 7 inside the manhole or pit M; a first drilling step of drilling one of the riser pipe side inlet 12 and riser pipe side outlet 14 in the circumferential wall of the riser pipe 10; a second drilling step of drilling the other of the riser pipe side outlet 14 and riser pipe side outlet 14 prior to installing the riser pipe 10 inside the manhole or pit M; a riser pipe 10 joint installation step of attaching a corresponding tubular inlet-side joint 30A or outlet-side joint 30B to the riser pipe side inlet 12 and riser pipe side outlet 14 so as to protrude to the outside of the riser pipe 10; and the riser pipe 10 The invention is characterized by performing the following steps: an invert casting step of casting an invert 20 at the lower end; a joint member 40 installation step of fitting joint members 40 onto the outer circumference of the inlet side joint 30A and the outlet side joint 30B, respectively; a riser pipe 10 installation step of erecting the riser pipe 10 inside the manhole or pit; a joint connection preparation step of bringing the inlet side joint 30A and the outlet side joint 30B close to or in contact with the inlet 3 and the outlet 5, respectively; and a joint connection step of moving each joint member 40 toward the inner surface of the manhole or pit and bringing them into contact with the periphery of the inlet 3 and the outlet 5 on the inner surface, thereby connecting the inlet side joint 30A and the inlet 3, and the outlet side joint 30B and the outlet 5, respectively, and connecting the inside and outside of the manhole or pit.

[0078] The rehabilitation method for manholes or pits M of the present invention (hereinafter also referred to as the rehabilitation method) involves casting an invert 20 to the lower end of the riser pipe 10 in the invert casting process prior to the riser pipe 10 installation process. Therefore, the invert 20 can be formed inside the manhole M simply by installing the riser pipe 10 in the manhole M. In other words, the rehabilitation method for manholes M of the present invention allows the invert 20 to be formed on the riser pipe 10 outside the manhole M, eliminating the need to perform work to form the invert 20 inside the manhole M. As a result, the rehabilitation method of the present invention eliminates the need to perform invert casting work in a limited space, significantly reducing the burden on workers.

[0079] Furthermore, in the rehabilitation method of the present invention, prior to the riser pipe 10 installation process, the riser pipe side inlet 12 and riser pipe side outlet 14 are drilled (formed) by the first drilling process and the second drilling process, and in the riser pipe 10 joint installation process, the inlet side joint 30A or the outlet side joint 30B is attached to the riser pipe side inlet 12 and riser pipe side outlet 14, respectively, so as to protrude to the outside. In other words, in the rehabilitation method of the present invention, since the inlet side joint 30A and the outlet side joint 30B are attached to the riser pipe 10 in advance, there is no need to perform joint connection work inside the manhole M, etc. Therefore, the rehabilitation method of the present invention can significantly reduce the burden on workers. Here, the positioning of the riser pipe side inlet 12 and riser pipe side outlet 14 in the first drilling process and the second drilling process can be done by appropriate means, such as obtaining the positions of the inlet 3 and outlet 5 of the manhole M, etc. to be constructed by actual measurement, or obtaining them based on design.

[0080] Furthermore, in the rehabilitation method of the present invention, with the riser pipe 10 erected inside the manhole M or the like, the joint member 40 is brought into contact with the inlet 3 and outlet 5 on the inner circumferential surface of the manhole M or the like and joined, thereby connecting the inlet-side joint 30A and inlet 3, and the outlet-side joint 30B and outlet 5, respectively, and creating communication between the inside and outside of the manhole M or the like. Therefore, the rehabilitation method of the present invention allows for easy piping connection of the riser pipe 10 to an existing manhole M with minimal work involving the sliding of the joint member 40 and joining to the inner circumferential surface of the manhole M or the like, thus significantly reducing the burden on workers. In addition, since the joint member 40 also functions as a seal, it can suppress water leakage and ingress at the connection points between the inlet 3 and outlet 5 and the inlet-side joint 30A and outlet-side joint 30B.

[0081] Here, the joint member 40 is preferably made of an elastic material such as rubber. This allows the joint member 40 to be joined to the inner surface of the manhole M, etc., even if the radius of curvature of the mounting portion 44 of the joint member 40 differs from the radius of curvature of the inner surface of the manhole M, etc., thus reducing the burden on workers during joining and improving versatility. Furthermore, in the rehabilitation method of the present invention, the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5 can be connected by the sliding of the joint member 40 against the inlet-side joint 30A or the outlet-side joint 30B, so that the connection allowance is kept to a minimum while ensuring workability. For this reason, the rehabilitation method of the present invention can be applied to manholes and pits with small pipe diameters, and the diameter of the riser pipe 10 can be made larger. As a result, the rehabilitation method of the present invention can minimize the reduction in the drainage volume of the manhole M, etc. after rehabilitation.

[0082] Here, the joint member 40 and the inner surface of the manhole M, etc., in the joint connection process can be joined using adhesive or sealant. The joint member 40 may be designed so that both the inlet and outlet sides slide, or so that only one side slides. If only one side of the joint member 40 slides, the fixed joint member 40 is joined to the inner surface of the manhole M, etc., and the other joint member 40 is slid using the joined joint member 40 as a reference to join to the inner surface of the manhole M, etc. The number of joint members 40 can be provided in appropriate quantities according to the number of inlets 3 and outlets 5, etc.

[0083] (f) In the method for rehabilitating a manhole or basin M of the present invention described above, the invert casting step is characterized in that the invert 20 is cast from a position at the same level as or lower than the lower end of the opening of the riser pipe side inlet 12 to a position at the same level as or higher than the lower end of the opening of the riser pipe side outlet 14.

[0084] The rehabilitation method for a manhole or drain of the present invention is such that the invert 20 is positioned from a position below the height of the lower end of the opening of the riser pipe side inlet 12 to a position above the height of the lower end of the opening of the riser pipe side outlet 14. In other words, in the rehabilitation method of the present invention, the invert 20 is positioned to slope downward from the riser pipe side inlet 12 to the riser pipe side outlet 14. Therefore, the rehabilitation method of the present invention can reliably drain wastewater flowing in from the inlet 3 to the outlet 5 without forming an invert 20 on the existing manhole M or the like.

[0085] (g) The method for rehabilitating a manhole or pit in the present invention described above is characterized in that, in the joint member 40 attachment step, the joint member 40 is slidably attached to the inlet side joint 30A or the outlet side joint 30B, and in the joint connection step, the joint member 40 is slid toward the inner circumferential surface of the manhole or pit in the manhole in the present invention, and then joined by contacting the inner circumferential surface, thereby sealing the space between the inlet side joint 30A and the inlet 3, and the space between the outlet side joint 30B and the outlet 5.

[0086] The rehabilitation member 1 for a manhole or drain box M of the present invention, when configured as described in (g) above, allows the joint member 40 to be easily joined to the inner surface of a manhole M or the like by sliding the joint member 40 along the inlet-side joint 30A or the outlet-side joint 30B. Furthermore, the rehabilitation method of the present invention can seal the space between the inlet-side joint 30A and the inlet 3, and the space between the outlet-side joint 30B and the outlet 5, thereby suppressing water leakage and ingress between the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5. In other words, a wide tolerance range for joining the inlet-side joint 30A and the inlet 3, and the outlet-side joint 30B and the outlet 5 can be secured, thus reducing the workload.

[0087] (h) The method for rehabilitating a manhole or basin M of the present invention described above is characterized in that the first drilling step is to drill a riser pipe side outlet 14 in the circumferential wall of the riser pipe 10, and the second drilling step is to drill a riser pipe side inlet 12 in the circumferential wall of the riser pipe 10 with reference to the position of the riser pipe side outlet 14.

[0088] The rehabilitation member 1 for a manhole or septic tank M of the present invention, when configured as described in (h) above, can be used as a reference to the outlet 5 which is normally located on the lower side, and the position of the perforation (formation) of the riser pipe side inlet 12 can be efficiently positioned using the lower end of the riser pipe 10 as a reference.

[0089] (i) The method for rehabilitating a manhole or basin M of the present invention described above is characterized in that an inlet-side joint 30A and an outlet-side joint 30B are provided with a tubular portion 32 and a saddle portion 34 connected to the base end of the tubular portion 32, and the riser pipe 10 joint installation step is to perform a riser pipe 10 joint insertion step in which the tubular portion 32 is inserted through the riser pipe side inlet 12 or riser pipe side outlet 14 from the inner circumference side of the riser pipe 10, and a riser pipe 10 joint joining step in which the saddle portion 34 is brought into contact with the inner circumference surface of the riser pipe 10 and joined.

[0090] The rehabilitation method for a manhole or pit in the present invention, when configured as described in (i) above, allows for the easy construction of the inlet-side joint 30A and the outlet-side joint 30B on the riser pipe 10 in advance. Therefore, the rehabilitation method of the present invention eliminates the need to connect the riser pipe 10 with the inlet-side joint 30A and the outlet-side joint 30B inside the manhole or pit, thus significantly reducing the burden on workers.

[0091] The above describes the structure and effects of the method for rehabilitating a manhole or box M of the present invention. However, the method for rehabilitating a manhole or box M of the present invention is not limited to the embodiments or modifications described above, and various modifications can be made within the scope of the present invention. For example, the method for rehabilitating a manhole or box M may be as described in (e) above, and can be formed into various shapes and sizes. Furthermore, the method for rehabilitating a manhole or box M of the present invention may, for example, not include some or all of the components related to (f) to (h) above, or may include some or all of (f) to (h) above and other components.

[0092] In this embodiment, the rehabilitation member 1 of the present invention is illustrated in the case of rehabilitation (repair) of a manhole M, but it can be applied not only to manholes M into which a person can enter, but also to manholes M of various shapes and sizes, regardless of whether a person can enter or not. Furthermore, in this embodiment, the case of application to a manhole M having one inlet 3 and one outlet 5 is illustrated, but the rehabilitation member 1 of the present invention may be provided even if one or both of the inlet 3 and outlet 5 are multiple. In addition, the rehabilitation member 1 of the present invention can be used in manholes M or boxes having inlets 3 and outlets 5 of various shapes and sizes. Furthermore, the riser pipe 10 can be of various shapes, sizes and materials depending on the shape and size of the manhole M, etc. Furthermore, the riser pipe side inlet 12 and riser pipe side outlet 14 can be of various shapes, sizes and quantities depending on the inlet 3 and outlet 5.

[0093] Furthermore, the invert 20 cast into the riser pipe 10 can be cast in various shapes and sizes depending on the shape, size, and position of the inlet 3 and outlet 5. Various materials can also be used for the invert 20. Additionally, various shapes, sizes, and quantities of the inlet-side joint 30A and outlet-side joint 30B are available. In this embodiment, the inlet-side joint 30A and outlet-side joint 30B are attached from the inside to the outside of the riser pipe 10, but they may also be attached to the outer circumference of the riser pipe 10 around the riser pipe-side inlet 12 and riser pipe-side outlet 14. Furthermore, the inlet-side joint 30A and outlet-side joint 30B are not limited to those having a saddle portion 34; for example, they may be attached via seals or the like while inserted through the riser pipe-side inlet 12 and riser pipe-side outlet 14.

[0094] Furthermore, in this embodiment, the joint member 40 is exemplified as being made of an elastic material such as rubber, but the material of the joint member 40 is not limited to elastic materials; various materials can be used. For example, the joint member 40 may be made of a flexible resin or the like. Also, in this embodiment, the joint member 40 is slidable on both the inlet side and the outlet side, but the joint member 40 may be slidable on only one side, either the inlet side or the outlet side. In such a case, the fixed joint member 40 is joined to the inner circumferential surface of the manhole M, etc., and the other joint member 40 is slid and joined to the inner circumferential surface of the manhole M, etc., using the joined joint member 40 as a reference. Note that the number of joint members 40 can be provided in appropriate quantities according to the number of inlets 3 and outlets 5 etc.

[0095] In this embodiment, the joint member 40 is capable of sealing between the inlet-side joint 30A and the inlet 3, and between the outlet-side joint 30B and the outlet 5. However, the present invention is not limited thereto. For example, the joint member 40 may not have a sealing function, and the spaces between the inlet-side joint 30A and the inlet 3, and between the outlet-side joint 30B and the outlet 5 may be sealed by a different member than the joint member 40.

[0096] In this embodiment, prior to installing the riser pipe 10 inside the manhole M, an existing invert removal step is performed to remove the existing invert 7 inside the manhole M, etc. However, the existing invert removal step may be performed only as needed, and may not be performed at all. In such cases, the riser pipe 10 can be erected in various ways, such as by directly erecting the riser pipe 10 on the existing invert 7, or by indirectly erecting the riser pipe 10 with appropriate plate material or the like placed on the existing invert 7. Furthermore, although this embodiment is configured as described in (a) above, the order of each step can be changed or some steps omitted as appropriate within the scope of the invention.

[0097] In this embodiment, as described in (f) above, the invert 20 is cast in the invert casting process from a position equal to or lower than the lower end of the opening of the riser pipe side inlet 12 to a position equal to or higher than the lower end of the opening of the riser pipe side outlet 14, but it is not limited to this. For example, if the riser pipe side inlet 12 and the riser pipe side outlet 14 are formed at the same height in the invert casting process, the invert 20 may be formed horizontally. Also, if the riser pipe side inlet 12 is formed lower than the riser pipe side outlet 14, the invert 20 may be formed with an upward slope.

[0098] In this embodiment, an example is provided of a configuration as shown in (h) above, but the invention is not limited thereto. In the rehabilitation method for manholes M etc. of the present invention, for example, in the first drilling step, a riser pipe side inlet 12 may be formed instead of a riser pipe side outlet 14, and in the second drilling step, a riser pipe side outlet 14 may be drilled in the peripheral wall of the riser pipe 10 with the position of the riser pipe side inlet 12 as a reference. That is, the formation order of the riser pipe side outlet 14 and the riser pipe side inlet 12 can be determined by the positional relationship between the riser pipe side outlet 14 and the riser pipe side inlet 12, and the riser pipe side inlet 12 may be formed first if it can be formed efficiently. Also, for example, if the positions of the riser pipe side inlet 12 and the riser pipe side outlet 14 can be determined in advance, the riser pipe side inlet 12 and the riser pipe side outlet 14 may be drilled simultaneously, or the riser pipe side inlet 12 and the riser pipe side outlet 14 may be formed integrally when the riser pipe 10 is molded.

[0099] In this embodiment, the configuration described in (i) above is shown as an example, but the joint installation process can be performed by installing joints 30 of various types (inlet-side joint 30A and outlet-side joint 30B) in various ways. Also, in this embodiment, the inlet-side joint 30A and outlet-side joint 30B are of the same shape, but they may be of different shapes and sizes.

[0100] The above describes various embodiments and modifications of the rehabilitation member and rehabilitation method for manholes or boxes according to the present invention. However, the present invention is not limited to those exemplified in the embodiments and modifications described above, and it will be readily apparent to those skilled in the art that other embodiments may exist in the spirit and teachings thereof, without departing from the scope of the claims. [Industrial applicability]

[0101] The manhole or box rehabilitation member and rehabilitation method of the present invention can be used for the rehabilitation (repair) of various types of manholes and boxes, such as manholes installed in houses and other buildings, and manholes installed in roads and other buildings. [Explanation of Symbols]

[0102] 1: Rehabilitation member 3:Inlet 5: Outlet 7: Invert (existing invert) 10: Standpipe 12: Standpipe side inlet 14: Standpipe side outlet 20: Invert 30: Fittings 30A: Inlet side fitting 30B: Outlet side fitting 32 :Tubular part 34: Saddle 40: Joint member 42: Joint opening 44: Mounting part M: Manhole

Claims

1. A rehabilitation member for a manhole or septic tank equipped with an inlet and an outlet, A riser pipe that can be erected inside the aforementioned box or manhole, At least one riser-side inlet is drilled in the circumferential wall of the riser, The circumferential wall of the riser pipe, having at least one riser pipe side outlet drilled below the riser pipe side inlet, An invert is driven into the lower end of the riser pipe, An inlet-side joint is attached to the riser-side inlet so as to protrude to the outside of the riser, An outlet-side joint is attached to the riser-side outlet so as to protrude to the outside of the riser, A joint member fitted onto the outer circumference of the inlet-side joint and the outlet-side joint, Equipped with, The invert is positioned from a location below the height of the lower end of the opening of the riser pipe side inlet to a location above the height of the lower end of the opening of the riser pipe side outlet. At least one of the joint members is slidable along the inlet-side joint or the outlet-side joint corresponding to the joint member. The inlet-side joint and the outlet-side joint are connected to the inlet and outlet, respectively, via the joint member, while the riser is erected inside the manhole or the pit. A manhole or box rehabilitation member characterized in that each of the aforementioned joint members is joined by abutting against the periphery of the inlet and outlet on the inner circumferential surface of the manhole or box while the riser is erected inside the manhole or box, thereby connecting the inlet-side joint and the inlet, and the outlet-side joint and the outlet, respectively, and creating communication between the inside and outside of the manhole or box.

2. The inlet side joint and the outlet side joint are, Tubular part, A saddle portion connected to the base end of the tubular portion, Equipped with, The tubular portion can be inserted into the riser side inlet or riser side outlet from the inner circumference side of the riser, The saddle portion is curved so as to be able to contact the inner circumferential surface of the riser pipe. The manhole or box rehabilitation member according to claim 1, characterized in that the tubular portion connects the inside and outside of the box or box when the saddle portion is joined to the inner surface of the riser pipe.

3. The aforementioned joint member is A joint opening that allows the inlet-side joint or the outlet-side joint to slide and be inserted, A mounting portion formed in at least a part of the periphery of the joint opening and which can be joined to the inner circumferential surface of the box or the manhole, It has, The manhole or box rehabilitation member according to claim 1 or 2, characterized in that the mounting portion can be joined to the inner circumferential surface of the manhole or box, thereby sealing the space between the inlet-side joint and the inlet, and the space between the outlet-side joint and the outlet.

4. The riser pipe side outlet is formed in advance to match the position of the outlet prior to the riser pipe being erected inside the manhole or the pit. The manhole or pit rehabilitation member according to claim 1 or 2, characterized in that the riser pipe side inlet is formed before the riser pipe is erected inside the manhole or pit, and after the riser pipe side outlet is formed.

5. A method for rehabilitating a manhole or basin equipped with an inlet and an outlet, A riser pipe that can be erected inside the aforementioned box or manhole is prepared, A process of removing an existing invert inside the aforementioned box or manhole, A first drilling step involves drilling a hole in the peripheral wall of the riser pipe, either a riser pipe-side inlet or a riser pipe-side outlet. Prior to installing the riser pipe inside the aforementioned box or manhole, a second drilling step is performed to drill the riser pipe side outlet and the remaining of the riser pipe side outlets, A riser pipe fitting installation step involves attaching a corresponding tubular inlet-side fitting or outlet-side fitting to the riser pipe side inlet and the riser pipe side outlet, respectively, so as to protrude to the outside of the riser pipe. An invert casting process in which an invert is cast into the lower end of the riser pipe, A joint member installation step involves fitting joint members onto the outer circumferences of the inlet-side joint and the outlet-side joint, respectively. A riser pipe installation step of erecting the riser pipe inside the box or manhole, A joint connection preparation step involves bringing the inlet-side joint and the outlet-side joint close to or in contact with the inlet and outlet, respectively. A joint connection step is to move each of the aforementioned joint members toward the inner circumferential surface of the manhole or the manhole, and to bring them into contact with the inlet and outlet on the inner circumferential surface to join them, thereby connecting the inlet-side joint and the inlet, and the outlet-side joint and the outlet, respectively, and creating communication between the inside and outside of the manhole or the manhole. A method for rehabilitating a manhole or pit, characterized by performing the following:

6. The method for rehabilitating a manhole or pit according to claim 5, characterized in that the invert casting step is performed by casting the invert from a position at the same level as or lower than the lower end of the opening of the riser pipe side inlet to a position at the same level as or higher than the lower end of the opening of the riser pipe side outlet.

7. In the joint member mounting step, the joint member is slidably mounted to the inlet-side joint or the outlet-side joint. A method for rehabilitating a manhole or pit according to claim 5 or 6, characterized in that, in the joint connection step, the joint member is slid toward the inner circumferential surface of the manhole or pit, and then brought into contact with the inner circumferential surface to join them, thereby sealing the space between the inlet joint and the inlet, and the space between the outlet joint and the outlet.

8. The first drilling step involves drilling a riser-side outlet in the circumferential wall of the riser, The method for rehabilitating a manhole or pit according to claim 5 or 6, characterized in that the second drilling step involves drilling a riser-side inlet in the circumferential wall of the riser, with reference to the position of the riser-side outlet.

9. The inlet-side joint and the outlet-side joint are provided with a tubular portion and a saddle portion connected to the base end of the tubular portion. The aforementioned riser joint installation process is as follows: A riser pipe fitting insertion step involves inserting the tubular portion into the riser pipe side inlet or riser pipe side outlet from the inner circumference side of the riser pipe, A riser pipe joint joining process in which the saddle portion is brought into contact with the inner circumferential surface of the riser pipe and joined, A method for rehabilitating a manhole or basin according to claim 5 or 6, characterized by performing the following:

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