Drainage fittings and drainage systems

Abstract

To provide a fitting with a drainage device capable of easily connecting an inflow port to an external drain pipe while adjusting connection positions of the inflow port and the external drain pipe when the connection positions are different from each other, and a catch basin system with the same.MEANS FOR SOLVING THE PROBLEM: A fitting or a drainage system including the same comprises: an invert part in which a spigot-shaped upper connection port whose length can be adjusted by cutting, an outflow port, and an internal passage are integrally formed; and a flame body that has a lower connection port, an inspection port and a cover body detachably attached to the inspection port. The fitting further comprises a trunk part in which a socket-shaped first connection port connected to the upper connection port of the invert part, and a second connection port connected to the lower connection port of the frame body, and an inflow port are integrally formed, and a drainage device is detachably attached to the inflow port.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] The present invention relates to a fitting equipped with a drainage device such as a check valve, and a drainage manhole system including the fitting, and in particular to a fitting that is inserted and connected between the invert part of the drainage manhole and the frame part of the lid, and a drainage manhole system including the fitting, in which the connection port of either the invert part or the fitting at the connection part between the invert part and the fitting is made into a spigot whose length can be adjusted by cutting, thereby making it possible to easily adjust the position (particularly the height) of the inlet of the fitting equipped with a drainage device, and a drainage manhole system including the fitting. [Background technology]

[0002] Generally, wastewater discharged from drainage facilities such as toilets in homes is collected in drainage manholes installed within residential areas via drainage pipes connected to each drainage facility in order to mitigate sudden changes in the amount of wastewater or to allow for the removal and inspection of foreign objects such as garbage.The wastewater collected in the drainage manholes then flows out into the main sewer pipe via public manholes or manholes.

[0003] However, due to abnormal weather in recent years, there have been frequent cases where large amounts of rainwater have flowed into the main sewer pipes in a short period of time. When a large amount of rainwater flows into the main sewer pipes, the drainage capacity of the main sewer pipes is exceeded, and the overflowing wastewater flows back through catch basins, etc., causing the backflowing wastewater to gush out from indoor drainage equipment connected to the drainage pipes.

[0004] For this reason, in order to prevent wastewater that has backflowed from the main sewer pipe from passing through drainage manholes and overflowing from indoor drainage equipment, backflow prevention devices have been developed that can be attached to the inlet of a drainage manhole, as described in Patent Publication No. 2006-283547 (Patent Document 1), for example.

[0005] However, the backflow prevention device described in Patent Document 1 is designed to be attached to the inlet of the invert part of the catch basin. Therefore, if the position of the invert part's inlet differs from the position (particularly the height) of the external drainage pipe to be connected, there is a problem in that it is necessary to excavate a wide area around the catch basin and lay out the external drainage pipe to match the height of the inlet.

[0006] On the other hand, in order to solve the above problems, a multi-hole has been developed, as described in Patent Publication No. 2009-269976 (Patent Document 2), in which a riser pipe extending in the vertical direction is connected to the upper opening of the invert section, and the side wall of the riser pipe is narrowed using a hole saw or the like, so that an inlet can be retrofitted to match the position (especially the height) of the external drainage pipe.

[0007] However, in the case of the multi-inlet described in Patent Document 2, after burying it, the side wall of the riser pipe must be narrowed using a hole saw or the like to align it with the position of the external drain pipe, and furthermore, the area around the drainage inlet must be excavated over a wide area to retrofit the inlet, again resulting in the problem of large-scale installation work for the drainage inlet. Also, since the backflow prevention device must be attached after the inlet has been retrofitted to the multi-inlet, there is the problem that the installation work for the drainage device must be carried out in the extremely narrow space inside the multi-inlet.

[0008] In order to solve the problems encountered with the multi-cylinder tank described in Patent Document 2, for example, Japanese Patent Application Laid-Open No. 6-229009 (Patent Document 3) discloses a drainage tank that has a manhole body with an outlet and an invert, a pipe material connected to the upper receiving port of the manhole body, and a coupling member with a lower receiving port and an inlet connected to the pipe material, and by cutting the length of the pipe material, the height of the inlet of the coupling member connected to the top of it can be adjusted to the height of an external drainage pipe.

[0009] However, the catch basin described in Patent Document 3 has the problem that a cuttable pipe material must be prepared and connected to the basin body to enable the height adjustment of the inlet of the coupling member, which is time-consuming and costly.In addition, the catch basin described in Patent Document 3 is not designed to have a backflow prevention device attached to the inlet, so there is the problem that if a new backflow prevention device is to be attached, the inlet of the coupling member must be modified, etc.

[0010] Furthermore, with the catch basin described in Patent Document 3, when attempting to set the lid at ground level, a second pipe must be prepared and connected between the frame supporting the lid and the coupling member in order to adjust the height of the frame and lid connected to the top of the pipe by cutting the length of the pipe. In particular, the catch basin described in Patent Document 3 has a socket-shaped upper connection port of the catch basin body and upper and lower connection ports of the coupling member to increase the degree of freedom in combining the components. Therefore, cutting the sockets makes it impossible to ensure the necessary receiving height (lap with the spigot) for connection and bonding. Therefore, there was a problem in that a dedicated pipe whose length can be adjusted by cutting must be prepared and used separately from the catch basin body, coupling member, and frame. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-283547 [Patent Document 2] Japanese Patent Application Publication No. 11-269976 [Patent Document 3] Japanese Patent Application Publication No. 6-229009 Summary of the Invention [Problem to be solved by the invention]

[0012] Therefore, the present invention aims to provide a fitting with a drainage device such as a check valve and a drainage manhole system including the fitting, in which the inlet equipped with the drainage device can be easily connected to match the connection position of the external drainage pipe even if the connection position (particularly height) between the inlet and the external drainage pipe is different, and in which assembly and installation work can be performed extremely easily. [Means for solving the problem]

[0013] The inventors have conducted extensive research into the components that make up a drainage manhole having an inlet equipped with a drainage device such as a backflow prevention valve, and the methods for connecting each component.As a result, they have discovered that the above-mentioned problems can be solved by configuring the drainage manhole from an invert section equipped with an outlet, a frame section for the lid, and a fitting that is equipped with drainage equipment for the inlet and is inserted and connected between the invert section and the frame section, and by making the connection port of either the invert section or the fitting at the connection part between the invert section and the fitting a spigot whose length can be adjusted by cutting, and have thereby completed the present invention.

[0014] That is, according to the present invention, there is provided a drainage system which is a tubular fitting which is inserted and connected between an invert part and a tubular frame part in a drainage manhole, or which comprises an invert part, a tubular frame part, and a tubular fitting which is inserted and connected between the invert part and the frame part, wherein the invert part is integrally formed with an upper connection port which is spigot-shaped and opens upward and can be cut to adjust its length, an outflow port which opens sideways, and an internal passage which connects the upper connection port and the outflow port, the frame part has a lower connection port which opens downward, an inspection hatch which opens upward, and a lid body which is removably attached to the inspection hatch, and the fitting has a body part which is integrally formed with a first connection port which is receptacle-shaped and connects to the upper connection port of the invert part, a second connection port which connects to the lower connection port of the frame part, and an inflow port which opens sideways, and a drainage system which includes such a fitting with a drainage device, in which a drainage device is removably attached to the inflow port.

[0015] According to the present invention, in a cylindrical fitting inserted and connected between the invert portion of a catch basin and the frame portion of a cover, or in a drainage system including said fitting, the first connection port of the fitting is in the shape of a socket, and the upper connection port of the invert portion connected to the first connection port is in the shape of a spigot, so that the inlet of the fitting can be easily connected to match the connection position of the external drain pipe by cutting and adjusting the length of the upper connection port of the invert portion. Also, the catch basin into which the fitting is inserted and connected is broadly composed of only three parts: an invert portion integrally molded with an internal passage connecting the upper connection port and the outlet, a frame portion whose cover is detachably attached to an inspection hatch, and a fitting consisting of an integrally molded body portion with a drainage device such as a check valve attached to the inlet, which has the advantage that assembly and installation of the catch basin can be extremely simplified.

[0016] The present invention also relates to a drainage system comprising an inverted fitting that is inserted and connected between an inverted fitting and a cylindrical frame body of a drainage manhole, or an inverted fitting, a cylindrical frame body, and a cylindrical fitting that is inserted and connected between the inverted fitting and the frame body, wherein the inverted fitting is integrally formed with an upper connection port that is receptacle-shaped and opens upward, an outlet port that opens sideways, and an internal passage connecting the upper connection port and the outlet port, the frame body has a lower connection port that opens downward, an inspection hatch that opens upward, and a lid that is detachably attached to the inspection hatch, and the fitting has a spigot-shaped shape that can be cut to adjust its length, and has a body portion integrally formed with a first connection port that is connected to the upper connection port of the inverted fitting, a second connection port that is connected to the lower connection port of the frame body, and an inlet that opens sideways, and the inlet has a drainage device attached thereto in a detachable manner, or a drainage system including such a fitting.

[0017] In this case, in a cylindrical fitting inserted and connected between the invert portion of the catch basin and the frame portion of the lid, or in a drainage system including said fitting, the first connection port of the fitting is spigot-shaped, and the upper connection port of the invert portion connected to the first connection port is socket-shaped, so that the inlet of the fitting can be easily connected to match the connection position of the external drain pipe by cutting and adjusting the length of the first connection port of the fitting. Also, the catch basin into which the fitting is inserted and connected is broadly composed of only three parts: an invert portion integrally molded with an internal passage connecting the upper connection port and the outlet, a frame portion whose lid is detachably attached to the inspection hatch, and a fitting consisting of an integrally molded body portion with a drainage device such as a backflow prevention valve attached to the inlet, which has the advantage that assembly and installation of the catch basin can be extremely simple.

[0018] In the joint with a drainage device of the present invention or the drainage system including said joint, the lower connection port of the frame body part may be in the form of a spigot whose length can be adjusted by cutting, and the second connection port of the joint may be in the form of a socket.

[0019] In this case, the lower connection port integrally molded with the frame body is shaped as a spigot, and the second connection port of the fitting connected to the lower connection port of the frame body is shaped as a socket, so that by cutting and adjusting the length of the lower connection port of the frame body, the positions of the inspection hatch and cover of the frame body can be easily adjusted to the ground surface.

[0020] In the joint with a drainage device of the present invention or the drainage system including the joint, the drainage device is preferably a check valve, a filter or an orifice.

[0021] If a drainage device such as a check valve, filter, or orifice is to be retrofitted to the inlet of a catch basin, extensive excavation must be carried out around the inlet at the construction site, and the drainage device must be installed within the limited space inside the catch basin. However, with the present invention, the assembly and installation of the catch basin can be completed simply by inserting and connecting a coupling with a pre-installed drainage device between the invert part of the catch basin and the frame part of the cover at the construction site, which has the advantage of being extremely easy. [Effects of the Invention]

[0022] According to the present invention, there is provided a drainage system which is a tubular fitting which is inserted and connected between an invert part and a tubular frame part in a drainage manhole, or which comprises an invert part, a tubular frame part, and a tubular fitting which is inserted and connected between the invert part and the frame part, wherein the invert part is integrally formed with an upper connection port which is spigot-shaped and opens upward and can be cut to adjust its length, an outflow port which opens sideways, and an internal passage which connects the upper connection port and the outflow port, the frame part has a lower connection port which opens downward, an inspection hatch which opens upward, and a lid body which is detachably attached to the inspection hatch, and the fitting has a body part which is integrally formed with a first connection port which is receptacle-shaped and connects to the upper connection port of the invert part, a second connection port which connects to the lower connection port of the frame part, and an inflow port which opens sideways, and a drainage system which includes such a fitting with a drainage device, in which a drainage device is detachably attached to the inflow port.

[0023] The present invention also relates to a drainage system comprising an inverted fitting that is inserted and connected between an inverted fitting and a cylindrical frame body of a drainage manhole, or an inverted fitting, a cylindrical frame body, and a cylindrical fitting that is inserted and connected between the inverted fitting and the frame body, wherein the inverted fitting is integrally formed with an upper connection port that is receptacle-shaped and opens upward, an outlet port that opens sideways, and an internal passage connecting the upper connection port and the outlet port, the frame body has a lower connection port that opens downward, an inspection hatch that opens upward, and a lid that is detachably attached to the inspection hatch, and the fitting has a spigot-shaped shape that can be cut to adjust its length, and has a body portion integrally formed with a first connection port that is connected to the upper connection port of the inverted fitting, a second connection port that is connected to the lower connection port of the frame body, and an inlet that opens sideways, and the inlet has a drainage device attached thereto in a detachable manner, or a drainage system including such a fitting.

[0024] As a result, according to the present invention, when the first connection port of the fitting is in a socket shape and the upper connection port of the invert part connected to the first connection port is in a spigot shape, the inlet of the fitting can be easily connected to match the connection position of the external drain pipe by cutting and adjusting the length of the upper connection port of the invert part. Also, when the first connection port of the fitting is in a spigot shape and the upper connection port of the invert part connected to the first connection port is in a socket shape, the inlet of the fitting can be easily connected to match the connection position of the external drain pipe by cutting and adjusting the length of the first connection port of the fitting.

[0025] In addition, according to the present invention, the drainage manhole into which the fitting is inserted and connected is broadly composed of only three parts: an invert section integrally molded with an internal passage connecting the upper connection port and the outflow port; a frame section in which the cover body is detachably attached to the inspection hatch; and a fitting consisting of an integrally molded body section in which a drainage device such as a backflow prevention valve is attached to the inflow port, thereby achieving the effect that assembly and installation of the drainage manhole can be carried out extremely easily. [Brief explanation of the drawings]

[0026] [Figure 1A] 1 is a cross-sectional view showing a joint with a drainage device according to a first embodiment of the present invention. [Figure 1B] 1B is a cross-sectional view of a catch basin system in which the joint with the drainage device shown in FIG. 1A is inserted and connected between the invert part and the frame part of the lid. [Figure 2A] FIG. 6 is a cross-sectional view showing a joint with a drainage device according to a second embodiment of the present invention. [Figure 2B] 2B is a cross-sectional view of a catch basin system in which the joint with the drainage device shown in FIG. 2A is inserted and connected between the invert part and the frame part of the lid. FIG. [Figure 3A] FIG. 10 is a cross-sectional view showing a joint with a drainage device according to a third embodiment of the present invention. [Figure 3B] 3B is a cross-sectional view of a catch basin system in which the joint with the drainage device shown in FIG. 3A is inserted and connected between the invert part and the frame part of the lid. FIG. [Figure 4A] FIG. 10 is a cross-sectional view showing a joint with a drainage device according to a fourth embodiment of the present invention. [Figure 4B] 4B is a cross-sectional view of a catch basin system in which the joint with the drainage device shown in FIG. 4A is inserted and connected between the invert part and the frame part of the lid. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, a drainage system including a joint with a drainage device according to one embodiment of the present invention, or an inverted portion, a frame portion, and a joint with a drainage device inserted and connected between the inverted portion and the frame portion, will be described in detail with reference to the drawings. Note that the present invention is not limited to the examples shown below, and various modifications are possible within the scope of the technical concept of the present invention. [Example]

[0028] First Embodiment Figure 1A shows a longitudinal cross-sectional view of a joint 2a with a drainage device according to the first embodiment of the present invention, taken along the central axis, and Figure 1B shows a longitudinal cross-sectional view of a drainage manhole system 1a in which the joint 2a with a drainage device shown in Figure 1A is inserted and connected between an invert portion 4a and a frame portion 5a of a lid, taken along the central axis.

[0029] As shown in Figure 1B, the drainage manhole system (drainage manhole) 1a of the first embodiment is broadly composed of three parts: an invert section 4a, a frame body section 5a with a lid body 6a removably attached to an inspection hatch 51a, and a cylindrical joint 2a inserted and connected between the invert section 4a and the frame body section 5a.

[0030] <Inverter section> In the drainage manhole system (drainage manhole) 1a of the first embodiment, the invert section 4a is integrally formed with an upper connection port 40a, which is a spigot-shaped opening upward, an outlet port 41a, which opens sideways, and an internal passage 42a connecting the upper connection port 40a and the outlet port 41a. In other words, the invert section 4a does not have a dedicated inlet for connecting to an external drainage pipe. The drainage manhole system (drainage manhole) 1a of the first embodiment constitutes a so-called drop manhole, in which wastewater flowing in from the inlet 22a of the fitting 2a (described later) is received into the internal passage 42a of the invert section 4a via the upper connection port 40a. Therefore, the invert section 4a can be installed in accordance with only the direction and level of the external drainage pipe connected to the outlet port 41a, regardless of the position of the external drainage pipe into which the wastewater flows.

[0031] The upper connection port 40a has a circular opening, and the outlet port 41a also has a circular opening. The upper connection port 40a and the outlet port 41a are connected by a smoothly curved internal passage 42a and the side wall of the inverter section 4a so that their central axes intersect at an angle of approximately 90°.

[0032] The invert portion 4a may be made of resin or concrete as long as it can integrally mold the upper connection port 40a, the outlet port 41a, and the internal passage 42a. However, from the viewpoints of formability, workability, ease of installation, durability (corrosion resistance), and relative lightness, thermoplastic resins such as vinyl chloride resin and polypropylene resin are preferably used, with vinyl chloride resin being particularly preferred.

[0033] Here, in this specification, the term "spigot" refers to a cylindrical straight pipe section formed so that the outer diameter of the outer periphery is constant over a predetermined length so that it can be inserted into a socket. In this embodiment, the spigot is preferably long enough that the length of the insertion portion into the socket remains even when the spigot is cut to adjust its length. On the other hand, in this specification, the term "socket" refers to a cylindrical straight pipe section formed so that the inner diameter of the inner periphery is constant over a predetermined length so that the spigot can be inserted into the socket. In this embodiment, a step is created by reducing the diameter of the inner periphery at a recessed position of the socket compared to the inner periphery of the socket. The step in the socket functions as a stopper when the tip of the spigot abuts against it, and also functions to eliminate the step between the inner periphery of the spigot and the inner periphery of the socket beyond the step.

[0034] <Frame part> In the drainage inlet system (drainage inlet) 1a of the first embodiment, the frame body 5a is provided with a short, approximately cylindrical frame body 52a integrally formed with a lower connection port 50a that opens downward and an inspection hatch 51a that opens upward. A disk-shaped lid 6a is detachably attached to the inspection hatch 51a.

[0035] In the first embodiment, the lower connection port 50a has a spigot shape. The spigot shape of the lower connection port 50a may be formed integrally by extending the length of the lower connection port 50a downward, or may be formed by extrapolating an existing circular pipe 55a onto the outer periphery of the lower connection port 50a, or may be integrally molded. In the first embodiment, from the viewpoint of reducing the number of parts of the lid body 6a to be assembled, the lower connection port 50a is formed integrally by extrapolating the circular pipe 55a onto its outer periphery.

[0036] A step 53a that protrudes inward is formed on the inner peripheral surface of a recessed position of inspection hatch 51a to support lid 6a from below. Furthermore, when excessive pressure is applied to the backside of lid 6a, lid 6a rises to a predetermined height to release the pressure to the outside, and a locking mechanism 60a is provided to prevent lid 6a from coming off inspection hatch 51a.

[0037] The frame body 5a may be made of resin, metal, concrete, or concrete partially mixed with metal as long as it can integrally mold the lower connection port 50a, inspection port 51a, and step portion 53a, but from the viewpoints of formability, processability, workability, durability (corrosion resistance), and relative lightness, thermoplastic resins such as vinyl chloride resin and polypropylene resin are preferably used, with vinyl chloride resin being particularly preferred. Similarly to the frame body 5a, the lid body 6a may also be made of resin, iron, concrete, or concrete partially mixed with metal, but thermoplastic resins such as vinyl chloride resin and polypropylene resin are preferably used, with vinyl chloride resin being particularly preferred.

[0038] <Joints> As shown in Figure 1B, in the drainage manhole system (drainage manhole) 1a of the first embodiment, the joint 2a with the drainage device of the present invention of the first embodiment is inserted and connected between the above-mentioned invert portion 4a and the frame body portion 5a.

[0039] 1A, the joint 2a has a generally cylindrical body 23a integrally formed with a first connection port 20a that opens downward in a circular shape and has a socket shape and is connected to the upper connection port 40a of the inverter section 4a, a second connection port 21a that opens upward in a circular shape and is connected to the lower connection port 50a of the frame body section 5a, and an inlet 22a that opens sideways in a circular shape. Therefore, the central axis of the inlet 22a is disposed so as to intersect the central axes of the first connection port 20a and the second connection port 21a, in other words, the central axis of the body 23a, at an angle of approximately 90°.

[0040] Furthermore, the joint 2a of the first embodiment does not have a dedicated outlet for connecting to an external drain pipe, and the wastewater that flows in from the inlet 22a of the joint 2a flows down to the internal passage 42a of the invert section 4a via the first connection port 20a, and then flows out to the external drain pipe through the outlet 41a of the invert section 4a. Therefore, the joint 2a can be installed only in accordance with the direction and level of the external drain pipe that is connected to the inlet 22a, regardless of the position of the external drain pipe from which the wastewater flows out.

[0041] In the first embodiment, the drainage device 3a can be detachably attached to the inlet 22a. 1A and 1B show an embodiment in which a check valve 3a is attached as the drainage device, but the drainage device 3a may also be a filter (not shown) intended to prevent the inflow of dust and the like from the inlet 22a, or an orifice (not shown) intended to control the amount of wastewater flowing in from the inlet 22a.

[0042] In the first embodiment, a base member 30a is fixed to the inlet 22a, and a backflow check valve body 31a is detachably attached to the base member 30a. This attachment configuration can also be applied to the above-mentioned filters and orifices.

[0043] The joint 2a may be made of resin or concrete as long as it can integrally mold the first connection port 20a, the second connection port 21a, and the inlet 22a in the body 23a, but thermoplastic resins such as vinyl chloride resin and polypropylene resin are preferably used from the viewpoints of formability, workability, ease of installation, durability (corrosion resistance), and relative light weight, with vinyl chloride resin being particularly preferred.Furthermore, the drainage device 3a is preferably made of resin from the viewpoints of formability, workability, ease of installation, durability (corrosion resistance), and relative light weight, with vinyl chloride resin being more preferred.

[0044] <Assembly and installation method of drainage manhole system (drainage manhole)> In the first embodiment of the joint 2a with a drainage device and the drainage manhole system (drainage manhole) 1a including the joint 2a, the invert portion 4a is first installed so that the outlet 41a matches the direction and level of the external drainage pipe, and the external drainage pipe is connected to the outlet 41a by bonding or welding.

[0045] Next, the length (height) of the upper connection port 40a is adjusted by cutting the upper connection port 40a of the invert part 4a so that the inlet 22a of the fitting 2a can be connected in accordance with the direction and level of the external drainage pipe. Note that if the cutting allowance of the upper connection port 40a required to adjust the level of the inlet 22a is known in advance, the length (height) of the upper connection port 40a may be adjusted by cutting before installing the invert part 4a.

[0046] Then, by inserting the first connection port 20a of the fitting 2a into the upper connection port 40a of the inverted portion 4a whose length (height) has been adjusted, the inlet 22a will be aligned with the level of the external drainage pipe, and simply aligning the orientation will allow for easy connection to the external drainage pipe. The connection between the first connection port 20a of the fitting 2a and the upper connection port 40a of the inverted portion 4a, and the connection between the inlet 22a of the fitting 2a and the external drainage pipe, can be achieved by bonding or welding. Furthermore, because the upper connection port 40a of the inverted portion 4a is spigot-shaped, sufficient insertion allowance (lap allowance) is ensured between the first connection port 20a of the fitting 2a and the socket-shaped first connection port 20a, even after cutting, ensuring sufficient connection strength.

[0047] In the fitting 2a of the first embodiment, the check valve 3a is pre-attached and detachably attached to the inlet 22a, so that the fitting 2a can be easily attached to the invert section 4a without having to consider the problems that may arise from retrofitting the check valve 3a.

[0048] Next, the length (height) of the lower connection port 50a is adjusted by cutting the lower connection port 50a of the frame portion 5a supporting the lid body 6a so that the lid body 6a can be installed at the same level as the ground. Note that if the cutting allowance of the lower connection port 50a required to adjust the level of the lid body 6a is known in advance, the length (height) of the lower connection port 50a may be adjusted by cutting before connecting the frame portion 5a.

[0049] Then, by inserting the lower connection port 50a of the frame body 5a, whose length (height) has been adjusted, into the second connection port 21a of the fitting 2a, the upper surface of the inspection hatch 51a of the frame body 5a, i.e., the cover 6a, will be level with the ground, allowing for easy connection to the fitting 2a. The lower connection port 50a of the frame body 5a and the second connection port 21a of the fitting 2a can be joined by adhesive or welding. Furthermore, because the lower connection port 50a of the frame body 5a is spigot-shaped, even after cutting, there is sufficient insertion allowance (lap allowance) for the socket-shaped second connection port 21a of the fitting 2a, ensuring sufficient connection strength.

[0050] After joining the frame body 5a to the joint 2a, the lid body 6a can be set into the inspection hatch 51a. Because the lid body 6a has a step 53a formed inside the inspection hatch 51a, it can be easily set into the inspection hatch 51a by releasing the locking mechanism 60a of the lid body 6a and placing the lid body 6a on the step 53a.

[0051] In this way, in the first embodiment of the fitting 2a that is inserted and connected between the invert portion 4a and the frame portion 5a of the lid, and in the drainage manhole system (drainage manhole) 1a that includes the fitting 2a, the first connection port 20a of the fitting 2a is in a receptacle shape, and the upper connection port 40a of the invert portion 4a that is connected to the first connection port 20a is in a spigot shape, so that by cutting and adjusting the length of the upper connection port 40a of the invert portion 4a, the inlet 22a of the fitting 2a can be easily connected to match the connection position of the external drainage pipe.

[0052] In addition, in the first embodiment, the drainage manhole 1a into which the fitting 2a is inserted and connected is broadly composed of three parts: the invert portion 4a, the frame body portion 5a with the cover body 6a attached to the inspection hatch, and the fitting 2a with the drainage device 3a attached, so assembly and installation of the drainage manhole system (drainage manhole) 1a can be carried out extremely easily.

[0053] Furthermore, in the first embodiment, the lower connection port 50a integrally molded with the frame body portion 5a is shaped as a spigot, and the second connection port 21a of the fitting 2a connected to the lower connection port 50a is shaped as a socket, so that by cutting and adjusting the length of the lower connection port 50a of the frame body portion 5a, the level of the upper surface of the inspection hatch 51a of the frame body portion 5a and the cover body 6a can be easily adjusted to the ground surface.

[0054] <Second embodiment> Figure 2A shows a longitudinal cross-sectional view of a joint 2b with a drainage device according to a second embodiment of the present invention, taken along the central axis, and Figure 2B shows a longitudinal cross-sectional view of a drainage manhole system 1b in which the joint 2b with a drainage device shown in Figure 2A is inserted and connected between an invert portion 4b and a frame portion 5b of the lid, taken along the central axis.

[0055] A joint 2b with a drainage device according to the second embodiment and a drainage manhole system (drainage manhole) 1b including the joint 2b are modified examples having substantially the same configuration as the first embodiment.

[0056] Specifically, in the second embodiment, the spigot shape of the lower connection port 50b in the frame body portion 5b is not formed by extrapolating a circular pipe, but is formed integrally by extending the length of the lower connection port 50b downward, and opens upward at the fitting 2b.The second connection port 21b connected to the lower connection port 50b of the frame body portion 5b has a straight pipe shape that can be used as both a socket and a spigot, with the same outer and inner diameters as the body portion 23b.

[0057] However, the inner peripheral surface of the second connection port 21b of the fitting 2b does not have a step that reduces the diameter to allow the tip of the lower connection port 50b of the frame body 5b to abut against it and function as a stopper. For this reason, in the second embodiment, an annular flange portion 54b that is expanded outward in diameter beyond the outer peripheral surface of the lower connection port 50b is provided at the top of the lower connection port 50b of the frame body 5b, and the flange portion 54b functions as a stopper when the tip of the second connection port 21b of the fitting 2b abuts against it.

[0058] The drainage inlet system (drainage inlet) 1b including the joint 2b with a drainage device of the second embodiment is identical in all respects to the drainage inlet system (drainage inlet) 1a including the joint 2a with a drainage device of the first embodiment and the joint 2a with a drainage inlet system (drainage inlet) 1a. Therefore, for other configurations of the second embodiment, effects achieved by these configurations, and methods for assembling and constructing the drainage inlet system (drainage inlet) 1b, please refer to the "first embodiment," and duplicated explanations will be omitted here.

[0059] <Third embodiment> Figure 3A shows a longitudinal cross-sectional view of a joint 2c with a drainage device according to a third embodiment of the present invention, taken along the central axis, and Figure 3B shows a longitudinal cross-sectional view of a drainage manhole system 1c in which the joint 2c with a drainage device shown in Figure 3A is inserted and connected between an invert portion 4c and a lid frame portion 5c, taken along the central axis.

[0060] A joint 2c with a drainage device according to the third embodiment and a drainage manhole system (drainage manhole) 1c including the joint 2c are modified examples having a different configuration from that of the first embodiment.

[0061] Specifically, in the third embodiment, the upper connection port 40c that opens upward in the invert portion 4c is made into a socket shape, and in the fitting 2c, the first connection port 20c that is connected to the upper connection port 40c of the invert portion 4c is made into a spigot shape whose length can be adjusted by cutting it.

[0062] In this way, in the third embodiment of the fitting 2c that is inserted and connected between the invert portion 4c and the frame portion 5c of the lid, and in the drainage manhole system (drainage manhole) 1c that includes the fitting 2c, the first connection port 30c of the fitting 2c is in a spigot shape, and the upper connection port 40c of the invert portion 4c that is connected to the first connection port 20c is in a socket shape, so that by cutting and adjusting the length of the first connection port 20c of the fitting 2c, the inlet 22c of the fitting 2c can be easily connected to match the connection position of the external drainage pipe.

[0063] The drainage inlet system (drainage inlet) 1c including the joint 2c with a drainage device of the third embodiment is identical in all respects to the drainage inlet system (drainage inlet) 1a including the joint 2a with a drainage device of the first embodiment and the joint 2a with a drainage inlet system (drainage inlet) 1a. Therefore, for other configurations of the third embodiment, effects achieved by these configurations, and methods for assembling and constructing the drainage inlet system (drainage inlet) 1c, please refer to the "first embodiment," and duplicated explanations will be omitted here.

[0064] <Fourth embodiment> Figure 4A shows a longitudinal cross-sectional view of a joint 2d with a drainage device according to a fourth embodiment of the present invention, taken along the central axis, and Figure 4B shows a longitudinal cross-sectional view of a drainage manhole system 1d in which the joint 2d with a drainage device shown in Figure 4A is inserted and connected between an invert portion 4d and a frame portion 5d of the lid, taken along the central axis.

[0065] A joint 2d with a drainage device according to the fourth embodiment and a drainage manhole system (drainage manhole) 1d including the joint 2d are modifications having substantially the same configuration as the third embodiment.

[0066] Specifically, in the fourth embodiment, the spigot shape of the lower connection port 50d in the frame body portion 5d is not formed by extrapolating a circular pipe, but is formed integrally by extending the length of the lower connection port 50d downward, and opens upward at the fitting 2d.The second connection port 21d connected to the lower connection port 50d of the frame body portion 5d has a straight pipe shape that can be used as both a socket and a spigot, with the same outer and inner diameters as the body portion 23d.

[0067] However, the inner peripheral surface of the second connection port 21d of the fitting 2d does not have a step that reduces the diameter to allow the tip of the lower connection port 50d of the frame body 5d to abut against it and function as a stopper. For this reason, in the fourth embodiment, an annular flange portion 54d that is expanded outward in diameter beyond the outer peripheral surface of the lower connection port 50d is provided above the lower connection port 50d of the frame body 5d, and the flange portion 54d functions as a stopper when the tip of the second connection port 21d of the fitting 2d abuts against it.

[0068] The drainage inlet system (drainage inlet) 1d including the joint 2d with a drainage device of the fourth embodiment and the drainage inlet system (drainage inlet) 1c including the joint 2d with a drainage device of the third embodiment are identical in all configurations other than those described above. Therefore, for other configurations of the fourth embodiment, effects achieved by these configurations, and methods for assembling and constructing the drainage inlet system (drainage inlet) 1d, please refer to the "third embodiment," and duplicated explanations will be omitted here. [Explanation of symbols]

[0069] 1a, 1b, 1c, 1d...Drainage system (drainage manhole) 2a, 2b, 2c, 2d... Joints with drainage devices 20a, 20b, 20c, 20d...First connection port 21a, 21b, 21c, 21d...Second connection port 22a, 22b, 22c, 22d...Inlet 23a, 23b, 23c, 23d... Torso 3a,3b,3c,3d...Drainage device (backflow prevention valve) 30a, 30b, 30c, 30d... Base member 31a, 31b, 31c, 31d: Backflow prevention valve body 4a, 4b, 4c, 4d... Inverter section 40a, 40b, 40c, 40d...Upper connection port 41a, 41b, 41c, 41d...outlet 42a, 42b, 42c, 42d...inner passage 5a,5b,5c,5d...frame body part 50a, 50b, 50c, 50d... Bottom connection port 51a, 51b, 51c, 51d Inspection hatch 52a, 52b, 52c, 52d...Frame body 53a, 53b, 53c, 53d...Stepped section 54b, 54d Flange section 55a,55c...Circular tube 6a,6b,6c,6d...Lid body 60a, 60b, 60c, 60d... Locking mechanism

Claims

1. A drainage system comprising an inverted portion in a catch basin, a cylindrical frame portion, and a cylindrical joint inserted and connected between the inverted portion and the frame portion, The inverter unit is an upper connection port having a socket shape that opens upward; A sideways opening outlet; and an internal passage that connects the upper connection port and the outlet port is integrally formed; and It does not have an inlet for connecting to an external drain pipe, The frame body portion is A lower connection port that opens downward; An inspection hatch that opens upward; and a cover body removably attached to the inspection hatch; and The joint is A drainage system having a spigot shape that can be adjusted in length by cutting, and a body portion integrally formed with a first connection port connected to the upper connection port of the inverter portion, a second connection port connected to the lower connection port of the frame body portion, and an inlet opening sideways, and a drainage device removably attached to the inlet.

2. 2. The drainage system according to claim 1, wherein the lower connection port of the frame body is a spigot shape that can be cut to adjust the length, and the second connection port of the coupling is a socket shape.

3. The drainage system according to claim 1 or 2, wherein the drainage device is a check valve, a filter, or an orifice.

Images