JP2013006149A - Volume increasing frame for septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volume increasing frame for septic tank for which cutting work corresponding to an inclined ground surface of an installation position can be easily performed, a member can be rapidly deformed from a flat plate shape to a cylindrical shape without requiring any large labor and the cylindrical shape can be surely maintained to resist an external pressure.SOLUTION: There is provided the volume increasing frame for septic tank connected to an upper opening of a septic tank body. The frame includes: a volume increasing member 2 integrally formed by molding processing by plastic, having a flat plate shape outline in which both ends of two flat plates 3 in overlapping arrangement are mutually connected via thin connection parts 4 having flexibility and the two flat plates 3 are provided with deformation promotion means 9 which can be curved and deformed into a semi-cylindrical body; and shape-retaining members 12 for holding forming portions of the thin connection parts 4 in a curved shape for forming a part of a cylindrical body.

Description

  The present invention relates to a raising tank for a septic tank used for the purpose of constructing a manhole having a required height when installing a septic tank for purifying sewage.

  The septic tank is a device that purifies and discharges sewage generated in a toilet of a general household. As shown in FIG. 7, the septic tank body 40 embedded in the ground treats sewage flowing from the inflow pipe 41 with microorganisms, etc. It functions to purify and flow out from the discharge pipe 42 to the outside. The septic tank main body 40 contains a filter bed, an air diffuser, and equipment for purifying sewage, so it is necessary to periodically perform maintenance inspections, state inspections, water quality inspections, etc. of these equipments. In order to perform this inspection and inspection from the ground surface, a manhole 43 is provided that allows the inside of the septic tank body 40 to be seen from the ground surface. This manhole 43 is formed by connecting a cylindrical raised frame 44 to the upper opening 40a of the septic tank body 40 embedded in the ground, and using concrete or asphalt hitting the outer peripheral surface side by using the raised frame 44 as an inner mold. By making it solidify, it is set as the structure connected to the upper end opening of the raising frame 44 from the upper opening part 40a of the septic tank main body 40. As shown in FIG. The upper end opening of the manhole 43 is covered with a manhole cover 47 at the normal time.

  The burial depth of the septic tank main body 40 from the ground surface becomes deeper because it is necessary to provide a corresponding drainage gradient as the installation location of the septic tank body 40 moves away from the sewage generation point such as a toilet. Therefore, the raised frame 44 needs to have a height corresponding to the embedment depth of the septic tank body 40 that varies depending on the septic tank installation location, and a manhole cover 47 having a different diameter depending on the type of the septic tank body 40. Since it is used, a cylindrical shape having a diameter corresponding to the diameter of the manhole cover 47 is required. Therefore, conventionally, it is necessary to prepare various types of cylindrical raising frames 44 having different heights and diameters, and it is difficult to secure a wide storage space for managing the many raising frames 44. Also, there were problems such as high transportation costs to the construction site. Moreover, as shown in FIG. 7, when the ground surface on which the manhole cover 47 is installed has an inclination, the upper part of the raising frame 44 must be cut into a shape corresponding to the inclination of the ground surface, and this cylindrical shape It is not easy to cut the raised frame 44.

  Therefore, in recent years, a septic tank raising frame that can be used in common for various installation conditions of the septic tank has been proposed (see, for example, Patent Document 1). This raising frame is composed mainly of a raising member 48 made of a simple flat plate as shown in FIG. 6A and a ring-shaped frame 49 as shown in FIG. 6C. In use, the raising member 48 made of a flat plate as shown in FIG. 6A is curved and deformed into a cylindrical shape to obtain a cylindrical raising member 48 having a predetermined diameter as shown in FIG. Subsequently, as shown in FIG. 6C, the frame body 49 is raised by a bolt 50 from the outside in a state where the ring-like frame body 49 is fitted to the upper end opening edge of the cylindrical raising member 48. By fixing to the member 48, the cylindrical septic tank raising frame 51 is assembled.

  The raising frame 51 for the septic tank is formed in a cylindrical shape by curving and deforming the raising member 48 made of a flat plate. Therefore, unlike the conventional raising frame in which the height and the diameter are not changed, the raising member 48 is formed in advance. It is possible to form a cylindrical body having a diameter corresponding to the septic tank by changing the curvature of bending, and to easily cope with different heights by cutting the flat plate-shaped raising member 48. Moreover, the raised member 48 made of a flat plate and the ring-shaped frame body 49 have an advantage that the storage and transportation are significantly easier than those of the conventional cylindrical body.

JP 2007-283189 A

  However, the septic tank raising frame 51 according to Patent Document 1 still has problems that have not been solved. That is, in the case where the manhole cover 47 is installed on the inclined ground surface as shown in FIG. 7, the flat plate-like raising member 48 is arranged in the rectangular longitudinal direction as shown by a one-dot chain line in FIG. Further, it is necessary to cut along a long cutting line, and to set a symmetrical cutting line with respect to the central portion, which requires complicated cutting work.

  Moreover, in this raising tank 51 for septic tanks, the raising member 48 is designed to hold the cylindrical shape only by the frame 49 fixed to the upper end opening of the septic tank. In order to maintain the cylindrical shape against the pressure received from the outside during the concrete placing process, it is necessary to form the raising member 48 from a material having a certain degree of rigidity such as hard plastic. . Thus, in order to bend and deform the raising member 48 made of a flat plate having a certain degree of rigidity into a cylindrical shape having a required diameter, considerable bending labor is required, and the raising member 48 has a predetermined cylindrical shape. This involves a difficult operation of fixing the frame body 49 to the raising member 48 with the bolts 50 while maintaining the curvedly deformed state. In fact, Patent Document 1 also describes an embodiment in which a plurality of flat plates are connected to form a raised member, thereby reducing the curvature of each flat plate to reduce bending labor. However, Patent Document 1 does not mention at all what connecting means is used to form a plurality of flat plates in a cylindrical shape. Therefore, the raising frame 51 for the septic tank requires difficult and complicated work, so that it takes time to assemble and the problem that it is difficult to assemble into an accurate cylindrical shape remains.

  The present invention has been made in view of the above-described conventional problems, and can easily perform a cutting operation to cope with the inclination of the ground surface of the installation place, and from a flat plate shape to a cylindrical shape without requiring much labor. An object of the present invention is to provide a raised frame for a septic tank that can be easily and quickly deformed and can reliably retain a cylindrical shape against an external pressure.

  In order to achieve the above object, the septic tank raising frame of the invention according to claim 1 is a septic tank raising frame connected to the upper opening of the septic tank body and having a height to raise the upper opening to the manhole cover. , Which are integrally formed by molding with plastic, and have both sides of each of the two flat plates in a superposed arrangement connected to each other via a flexible thin connecting portion, The flattened member is provided with a raising member provided with a deformation promoting means capable of being bent and deformed into a semi-cylindrical body, and the thin-walled connecting portion with respect to the raising member curved and deformed into a cylindrical body by the deformation promoting means in use Is attached so as to be sandwiched from both inside and outside of the cylindrical body, and the formation portion of the thin-walled connecting portion is held in a curved shape forming a part of the cylindrical body. It is characterized by comprising a shape-retaining member.

  The raising frame for the septic tank of the invention according to claim 2 is a thin plate portion in which the deformation promoting means in the invention of claim 1 is provided on the opposite surface side of the two flat plates to each other, The apex angle is located on the boundary line between the thick plate portion provided on the mutually opposing surface side of the flat plate with a thickness larger than the thin plate portion and the thin plate portion in the thick plate portion 2 A cross-sectional shape of an equilateral triangle, and a plurality of dividing grooves that are formed so as to open toward the opposing surfaces and divide the thick plate portion into a plurality of pieces, It is characterized in that it is curved and deformed into a cylindrical body by bringing the opposing groove side walls of all the divided grooves into close contact with each other.

  According to a third aspect of the present invention, there is provided a septic tank raising frame in which the thick plate portion is deformed into a cylindrical shape when the plurality of dividing grooves according to the second aspect of the invention are brought into close contact with the opposing groove side walls. As described above, the cross-sectional shape of an isosceles triangle having a predetermined apex angle that differs for each arrangement position is set.

  The raising frame for a septic tank of the invention according to claim 4 is a raising frame for a septic tank that is connected to the upper opening of the septic tank body and has a height for raising the upper opening to the manhole cover, and is integrally formed by molding with plastic The raised plate has a flat outer shape in which both side ends of each of the two flat plates arranged in an overlapping manner are connected to each other via a thin connecting portion. Each is provided with a deformation promoting means capable of bending and deforming the semi-cylindrical body.

  The raising frame for a septic tank of the invention according to claim 5 is a raising frame for a septic tank that is connected to the upper opening of the septic tank body and has a height for raising the upper opening to the manhole cover, and is integrally formed by molding with plastic A raised member having a flat outer shape in which both side ends of two flat plates arranged in an overlapping manner are connected to each other via a thin connecting portion having flexibility, and the raised member is a cylindrical body in use. It is characterized by comprising the thin-walled connecting portion and a reinforcing member joined to the peripheral portion thereof when being bent and deformed.

  The raising frame for a septic tank of the invention according to claim 6 is the invention according to claim 5, wherein the raising frame is further formed into a disk shape having a predetermined diameter by being filled with fluid and curvedly deformed into a cylindrical body. It is characterized by having a shape-retaining bag body that is inserted into the member and holds the raised member in a cylindrical body.

  According to the raising frame for a septic tank according to claim 1, since it is a configuration only including a raising member having a substantially flat outer shape and a shape-retaining member, a single piece like a conventional raising frame. The outer shape is about half that of a flat plate-shaped raising member, which facilitates handling, eliminates the need for a large storage space, and reduces transportation costs. In addition, when the manhole cover is installed on the inclined ground surface, the two flat plates of the raising member can be cut simultaneously in a superposed arrangement, so that the cutting length is an abbreviation of the conventional single flat plate. In addition, since the raised member can be cut along a simple straight cutting line, the cutting operation becomes much easier.

  Furthermore, since the raising member is provided with a deformation promoting means capable of bending and deforming the cylindrical body, even if it is formed to have a certain degree of rigidity by molding a hard plastic as a molding material, The deformation promoting means can be easily deformed from a flat outer shape to a cylindrical shape without requiring a large bending effort, and it is only necessary to attach a shape-retaining member to this cylindrically shaped raising member, so that the raising frame can be easily Can be assembled quickly with simple work. In addition, the raised frame after assembly is manufactured by the two shape-retaining members so that the two thin-walled connecting portions of the raised member are securely held in a cylindrical shape, and the raised member is manufactured, for example, by molding with hard plastic. By having rigidity in some cases, the cylindrical shape can be reliably held against the external pressure when hitting concrete or asphalt.

  According to the raising frame for a septic tank according to claim 2, the opposing groove sidewalls of the multiple dividing grooves are in close contact with each other by curving only the portions facing the respective dividing grooves of the thin plate portion that can be easily bent in the flat plate body. Since each thick plate portion of the two flat plates can be deformed into a cylindrical shape, even if the raising member is formed by using, for example, hard plastic as a molding material and has a certain degree of rigidity, the raising member Can be quickly curved and deformed into a cylindrical shape without requiring a large bending effort.

  According to the raising frame for a septic tank according to claim 3, since a large number of dividing grooves are formed to have an isosceles triangular cross-sectional shape having a predetermined apex angle for each arrangement position, all the dividing grooves are formed. By bringing the opposing groove sidewalls into close contact with each other, the raising member can be curved and deformed into an accurate cylindrical shape.

  According to the raising frame for a septic tank according to the fourth aspect, since it is a configuration only including the raising member having a substantially flat outer shape, the raising member made of a single flat plate is used as in the conventional raising frame. The outer shape is less than half that of what it has, making it easier to handle, eliminating the need for a large storage space, and reducing transportation costs. In addition, when installing the manhole cover on the inclined ground surface, the two flat plates of the raising member can be cut at the same time in an overlapping arrangement, so that the cutting length is half that of a conventional flat plate, Since the raising member may be cut along a simple straight cutting line, the cutting operation becomes much easier. Furthermore, since the raising member is provided with a deformation promoting means capable of bending and deforming the cylindrical body, for example, it is a case where a rigid plastic is molded as a molding material and has a certain degree of rigidity. However, the deformation promoting means can quickly deform from a flat outer shape to a cylindrical shape by an easy operation without requiring a large bending effort. Although this cylindrical raising member does not have the strength to hold the cylindrical shape at the two locations where the thin connecting portions are formed, the cylindrical raising frame is provided at the lower end of the cylindrical raising frame when the septic tank is installed. A method of fitting the lower manhole frame and the upper manhole frame to the edge and the upper opening edge, respectively, may be adopted, and when installing a manhole by this method, the two thin-walled connecting parts of the raising member The formation portion is fitted into the upper and lower manhole frames, and the raising member is securely held in a cylindrical shape against the external pressure when hitting concrete or asphalt.

  According to the raising frame for a septic tank according to claim 5, the raising member in which the two flat plates are arranged in an overlapped manner and the both side ends thereof are connected via the thin connecting portion to form a substantially flat outer shape, and the thin connecting portion. Further, since it is composed only of reinforcing members joined to the peripheral portions thereof, handling is remarkably easy, a large storage space is unnecessary, and transportation costs are reduced. In addition, when the ground surface on which the manhole cover is installed is inclined, it is possible to cut the two flat bodies of the flat plate-shaped raising member at the same time in a superposed arrangement, and along a simple straight cutting line. Since it can cut | disconnect, the cutting operation of the raising member becomes remarkably easy. Further, for example, in the case of manufacturing by a molding process using a soft plastic, it can be deformed from a flat plate shape to a cylindrical shape by an easy operation without requiring a large bending effort. At this time, since the cylindrical raising member has low rigidity, it is difficult to hold the cylindrical shape against the external pressure, but when installing the septic tank, the lower end opening edge and the upper end opening edge of the cylindrical raising frame In some cases, a lower manhole frame and an upper manhole frame are fitted and attached to each other. If applied to this installation method, the raising member is a ring-shaped lower manhole frame attached to the lower end and the upper end. And it is reinforced by the upper manhole frame, and even if it resists external pressure when hitting concrete or asphalt, it is securely held in a cylindrical shape.

  According to the raising frame for the septic tank according to the sixth aspect, since the shape-retaining bag body filled with the fluid is inserted into the inside of the cylindrical raising member, it is quickly assembled by an easy operation. be able to. Furthermore, even when the construction method for attaching the lower manhole frame and the upper manhole frame to the lower opening edge and the upper opening of the raising frame is not adopted when installing the septic tank, the cylindrical raising member has its own rigidity. Although it is low, it is reinforced to hold the cylindrical shape by a shape-retaining bag inserted inside as a disk shape due to fluid filling, and it is securely held in a cylindrical shape against the external pressure when hitting concrete or asphalt The Further, this raising frame has an advantage that the shape retaining bag can be reused by removing the shape retaining bag from the raising member after the concrete or asphalt is solidified and releasing the internal fluid.

(A), (b) is the top view and front view of the state before use of the raising member of the raising frame for septic tanks concerning 1st Embodiment of this invention. (A), (b) is the top view and front view of the state which curvedly deformed the raising member same as the above to a cylindrical shape. It is a disassembled perspective view of the raising frame which shows the state which attaches a fixing member to the raising member of the state of FIG. (A), (b) is the top view and front view of the state before use of the raising member of the raising frame for septic tanks concerning 2nd Embodiment of this invention. (A) is a cross-sectional view of the raising frame for septic tanks same as the above, and (b) is a cross-sectional view taken along line AA of (a). (A)-(c) is the perspective view which showed the raising frame for conventional septic tanks in assembly order, (d) is the front view which showed the cutting line at the time of cut | disconnecting the raising member of the raising frame for the septic tanks. It is a schematic front view for demonstrating the raising frame for septic tanks.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  1A and 1B are a plan view and a front view showing a state in which the raising member 2 is not used in the raising frame for a septic tank according to the first embodiment of the present invention. In FIG. For convenience, the case where the raising member 2 which exhibits a flat-plate-like appearance as a whole is viewed in the raised direction (up and down direction in FIG. 1B) is shown. In this embodiment, the raising member 2 is illustrated as one integrally molded by blow molding using a hard plastic as a molding material. As the molding material, it is preferable to use a vinyl chloride resin having excellent processability, or polyethylene having a relatively high softening point and high crystallinity and excellent flexibility, and tectoroid and cellulose acetate are also suitable. Can be used.

  The raising member 2 is an overlapping arrangement in which two flat plates 3 and 3 having the same thickness and exhibiting a rectangular appearance are opposed to each other with a predetermined gap therebetween. Both side ends in the left-right direction are connected to each other via thin-walled connecting portions 4 and 4 having a curved shape. As shown in FIG. 1A, each flat plate 3 and 3 is divided by a two-dot chain line, and a thin plate portion 7 having a uniform thin thickness is formed on the entire surface on the opposite side to the opposite surface. While being provided, a thick plate portion 8 having a thickness approximately twice that of the thin plate portion 7 is provided on the mutually opposing surface side. The thick plate portion 8 has a large number of isosceles triangle cross-sections whose apex angle is located on the boundary line with the thin plate portion 7 indicated by a two-dot chain line at each equally spaced position along the orthogonal direction. The dividing groove 9 is formed. These dividing grooves 9 are formed in an arrangement parallel to each other and extending in the raising direction. Each of the divided grooves 9 is formed in a shape having the largest apex angle at the central portion in the orthogonal direction, and is formed in a shape in which the apex angle gradually decreases as the distance from the central portion toward both sides is increased. ing. Locking grooves 10 each having a groove depth extending from the thin plate portion 7 to the middle portion in the thickness direction of the thick plate portion 8 are formed in the vicinity of both ends of the flat plates 3 and 3 so as to extend in the raising direction. ing. Between each of the locking grooves 10 and the thin connecting portion 4, a contact strip portion 11 having a triangular cross-sectional shape and substantially the same thickness as the thick plate portion 8 is formed so as to extend in the raising direction. Yes.

As shown in FIG. 3, the septic tank raising frame 1 </ b> A according to the first embodiment is composed of the above-described raising member 2 and the two shape retaining members 12, 12. As shown in FIG. 1, the raising member 2 is handled in a state of having a substantially flat outer shape in which two flat plates 3 and 3 are superposed and arranged. Moreover, the two shape-retaining members 12, 12 have a substantially rail shape having the same length as the height of the raising member 2 in the raising direction. Therefore, the raising frame 1A for the septic tank can be managed without securing a wide storage space, and can be transported to the place where the septic tank is installed at an inexpensive cost.

  Next, a procedure for assembling the septic tank raising frame 1A into a required shape when the septic tank is installed will be described. While the thin connecting portions 4 and 4 at both ends of the raising member 2 are deformed from the folded curved shape shown in FIG. 1A to an arc shape close to the straight line shown in FIG. The central portions are spaced apart from each other so as to be semicircular in plan view, and the raising member 2 is formed into a cylindrical shape as shown in FIG. The raising member 2 is formed from a hard plastic as a molding material, so that it has a certain degree of rigidity, but it does not require a large bending effort, so that it can be removed from the flat outer shape of FIG. It can be easily deformed into the cylindrical shape of FIG. That is, since the thin connecting portions 4 and 4 at both ends of the raising member 2 are thin, it is relatively easy to change from the folded curved shape in FIG. 1A to an arc shape close to a substantially straight line in FIG. The flat plate members 3 and 3 are deformed to promote the curved deformation, and the flat plate members 3 and 3 are divided into the thin plate portions 7 because the thick plate portions 8 and 8 are divided by a large number of dividing grooves 9. The flat plates 3 and 3 can be deformed into a curved shape by bending only at locations facing the multiple dividing grooves 9 in. At this time, the thick plate portion 8 that cannot be easily deformed is only deformed into a curved shape as a result of the opposing groove sidewalls of the dividing grooves 9 being in close contact with each other, and any portion of itself is not deformed. . Accordingly, each divided groove 9 functions as a deformation promoting means that can bend and deform the raised member 2 from a flat plate shape to a cylindrical shape.

  When the raising member 2 is deformed, the flat plate bodies 3 and 3 are formed so that the opposing groove side walls of the dividing groove 9 having an isosceles triangle cross section come into close contact with each other, and the dividing groove 9 disappears, 8 is curved and deformed into a continuous cylindrical shape. That is, in the thick plate portions 8 and 8, when the dividing groove 9 is lost, both the flat plates 3 and 3 have an accurate semi-cylindrical shape. In other words, the plurality of dividing grooves 9 are formed in an isosceles triangular cross-sectional shape having an apex angle that allows the flat plate-like thick plate portions 8 and 8 to be curved and deformed in a semicircular shape in a plan view. Yes. Therefore, as described above, each dividing groove 9 has a shape having the largest apex angle at the central portion in the direction orthogonal to the raising direction, and the apex angle gradually increases as the distance from the central portion increases toward both sides. It is formed in a shape that becomes smaller.

  When the raising member 2 is deformed into a cylindrical shape as described above, as shown in FIG. 2 (a), the two end surfaces of the two contact strips 11 and 11 on both side ends are abutted with each other. The thin connecting portions 4 and 4 are held in an arc shape that forms a part of the cylindrical body, and the two engaging grooves 10 and 10 communicate with each other outside the abutting strips 11 and 11 in the butted state. A concavity 13 is formed.

  Finally, the two shape-retaining members 12, 12 are attached to the raising member 2 having a cylindrical shape. As shown in FIG. 3, the shape retaining member 12 includes a belt-shaped inner fixing piece 14 applied to the inner peripheral surface of the cylindrical raising member 2, an outer fixing piece 17 attached to the outer peripheral surface of the raising member 2, A connecting piece 18 that connects the upper ends of the inner fixing piece 14 and the outer fixing piece 17 is integrally formed of metal or hard plastic. The outer fixing piece 17 is bent at both end portions of the holding piece portion 17a fitted into the engaging recess 13 of the cylindrical raising member 2 and fitted into the locking grooves 10 and 10. It has locking piece portions 17b and 17b.

  The shape retaining member 12 inserts the inner fixing piece 14 along the inner peripheral surface of the thin connecting portion 4 in the cylindrical raising member 2, and simultaneously holds the holding piece portion 17 a in the engaging recess 13 of the raising member 2. In addition, the outer fixing piece 17 is pushed down along the outer peripheral surface of the raising member 2 while the engaging piece portions 17b and 17b are fitted in the engaging grooves 10 and 10 at both ends of the engaging concave portion 13, respectively. When the lower end of each of the piece 14 and the outer fixed piece 17 reaches the lower end of the raising member 2, the connecting piece 18 contacts the upper end surface of the cylindrical raising member 2, and the two shape retaining members 12, 12 It is attached to the raising member 2 as shown by a two-dot chain line in FIG.

  Thereby, as shown in FIG. 3, the connecting portion of the two flat plates 3, 3 of the raising member 2 in the semi-cylindrical shape is the holding piece portion of the inner fixing piece 14 and the outer fixing piece 17 of the shape retaining member 12. The thin connecting portion 4 and the two contact strips 11 and 11 reinforced by being sandwiched from inside and outside by 17a are firmly held in a planar arc shape forming a part of a cylindrical shape. Further, the thin-walled connecting portion 4 extends and cuts even when subjected to external pressure by the outer fixing piece 17 in which the locking pieces 17b and 17b are fitted in the locking grooves 10 and 10 located at both ends of the thin connecting portion 4. Is reliably prevented. Further, the two flat plates 3 and 3 having a semi-cylindrical shape have rigidity due to the hard plastic of the molding material, and are formed in a curved shape in which the opposing groove side walls of all the divided grooves 9 are in close contact with each other. Therefore, even when external pressure is applied, the portions divided by the dividing grooves 9 in the thick plate portion 8 stick to each other through the closely-flanking opposing groove sidewalls of the dividing grooves 9, so It acts to maintain the cylindrical shape.

  As is clear from the above description, the septic tank raising frame 1A has the following various features. That is, the two flat plates 3 and 3 are arranged in an overlapping manner, and both side ends thereof are connected via the thin connecting portions 4 and 4 to form a substantially flat plate-like outer shape, and two substantially rail-shaped members. Since it is composed of the holding members 12 and 12, it is easier to handle than the conventional raising member made of a single flat plate like the raising frame, a large storage space is not required, and the transportation cost is also reduced. it can. In addition, when the ground surface on which the manhole cover is installed is inclined, the two flat bodies 3 and 3 in the raising member 2 having a flat outer shape can be cut at the same time while being superposed, so that FIG. As shown by the one-dot chain line in Fig. 6), it is sufficient to cut along a simple straight cutting line. As is clear from comparison with Fig. 6 (d) showing the conventional cutting line, the cutting length is halved. In addition, since the cutting is performed along a cutting line composed of a single straight line, the cutting operation becomes much easier. Further, since the raising member 2 is formed by using a hard plastic as a molding material, the raising member 2 has a certain degree of rigidity, but it does not require a large bending effort as described above. Since the outer shape can be easily deformed into a cylindrical shape, and only the two shape-retaining members 12 and 12 are attached to the cylindrical raising member 2, it can be quickly assembled by an easy operation.

  Further, the raising member 2 bends and deforms the two flat plates 3 and 3 into a semicircular shape in plan view by bringing the opposing groove side walls of the plurality of dividing grooves 9 into close contact with each other. It can be set as the cylindrical shape which becomes. Furthermore, the raised frame 1A after assembly is reinforced by the two shape retaining members 12 and 12 so that the formation positions of the two thin-walled connecting portions 4 and 4 of the raising member 2 securely hold the cylindrical shape. The two flat plates 3 and 3 have rigidity due to the hard plastic of the molding material, and the opposing groove sidewalls of all the divided grooves 9 are in close contact with each other and are formed into a continuous semicircular shape. Accordingly, the raised frame 1A after assembly has high rigidity that can reliably retain the cylindrical shape even when subjected to external pressure when hitting concrete or asphalt.

  In the above-described first embodiment, the case where the raising member 2 is manufactured by a molding process using hard plastic is exemplified. Therefore, the deformation promotion for bending and deforming the two flat bodies 3 and 3 having high rigidity into a cylindrical shape is performed. As a means, a thin plate portion 7 and a thick plate portion 8 are provided in the thickness direction of the two flat plates 3, 3, and a plurality of dividing grooves 9 having an isosceles triangular cross-sectional shape are formed in the thick plate portion 8. The configuration is provided. Therefore, when the raising member 2 is manufactured by, for example, a molding process using a soft plastic, it is a matter of course that the deformation promoting means is configured differently from the first embodiment.

Further, when installing the septic tank, a method of attaching a cylindrical raised frame by fitting a lower manhole frame and an upper manhole frame to the lower opening edge and the upper opening edge, respectively, may be employed. When installing a manhole by such a construction method, the shape retaining member 12 of the embodiment may be omitted. That is, the two thin-walled connecting portions 4 and 4 of the raising member 2 are formed in the upper and lower manhole frames without being reinforced by attaching the shape retaining member 12 to the external pressure when hitting concrete or asphalt. This is because it is securely held in a cylindrical shape.

  4 (a) and 4 (b) are a plan view and a front view showing a state where the raising member 20 is not used in the raising frame for a septic tank according to the second embodiment of the present invention, and FIG. For the sake of convenience, the case where the raising member 20 that exhibits a flat plate-like appearance as a whole is viewed in the raised direction (the vertical direction in FIG. 4B) is shown. The raising member 20 is integrally formed by a pro-molding process using soft plastic as a molding material, and it is preferable to use polyethylene or vinyl chloride resin as the molding material.

  The raising member 20 is formed and processed into a shape in which both side ends of the two flat plates 21 and 21 arranged in an overlapping manner are connected to each other via thin-walled connecting portions 22 and 22. When used for raising the septic tank, as shown in FIG. 5, the two flat plates 21 and 21 are easily elastically deformed into a semi-cylindrical shape by the softness of the soft plastic of the molding material. It can be a cylindrical shape. And the raising member 20 deform | transformed into the cylindrical shape is reinforced by sticking the reinforcement table member 23 on the outer peripheral surface which opposes the thin connection parts 22 and 22 in each flat plate 21 and 21. Subsequently, the shape retaining bag body 24 is filled with a fluid 27 such as air or water and sealed, whereby each shape retaining bag body 24 has an outer diameter for holding the raising member 20 in a predetermined cylindrical shape. It is made into the substantially disk shape which has. A required number of the shape retaining bag bodies 24 are inserted into the cylindrical raising member 20. Accordingly, the septic tank raising frame 1 </ b> B of the second embodiment is constituted by the raising member 20, the reinforcing tab member 23, and the shape-retaining bag body 24 having a flat outer shape. The number of the shape-retaining bag bodies 24 used varies depending on the height of the raising member 20. In the septic tank raising frame 1B, the raising member 20 is formed of a soft rigid resin, but the inside of the state in which the raising member 20 is deformed into a cylindrical shape is filled with a fluid 27 and has a disk shape having a predetermined outer diameter. Since the shape-retaining bag body 24 is inserted, the raising member 20 is reliably held in a cylindrical shape even when subjected to external pressure when hitting concrete or asphalt.

  Also in the septic tank raising frame 1B of the second form, as in the first embodiment, the two flat plates 21 and 21 are overlapped with each other and the both ends thereof are connected via the thin connecting portions 22 and 22, respectively. Since it is composed of the raising member 20 having a substantially flat outer shape, the reinforcing tab member 23, and the shape retaining bag body 24 enclosing the fluid 27, it is easy to handle and does not require a wide storage space. Transportation costs can also be reduced. In addition, when the ground surface on which the manhole cover is installed is inclined, the two-layered flat plates 21 and 21 of the raising member 20 having a flat outer shape can be cut simultaneously along a simple straight cutting line. The cutting operation of the raising member 20 becomes much easier. Furthermore, the raising member 20 can be easily deformed into a cylindrical shape by being molded with a soft plastic, and the shape retaining body 24 filled with the fluid 27 is simply inserted into the cylindrical raising member. It can be assembled quickly and easily.

  Further, the raising member 20 is formed of a soft material. However, if the shape bag body 24 is formed in an accurate circular shape in plan view when the fluid 27 is filled, the raising member 20 is formed into an accurate cylindrical shape. Can be held in. Further, the raised frame 1B after assembly supports the raised bag 20 filled with fluid so that the raised member 20 maintains a cylindrical shape from the inside even when subjected to external pressure when hitting concrete or asphalt. Further, the raised frame 1B has an advantage that the shaped bag 24 can be reused by removing the shaped bag 24 from the raised member 20 and releasing the internal fluid after the concrete or asphalt is solidified. .

Further, as described above, when installing the septic tank, a method of attaching the cylindrical raised frame by fitting the lower manhole frame and the upper manhole frame to the lower opening edge and the upper opening edge of the cylindrical raising frame, respectively, is adopted. There is. When installing a manhole by such a construction method, the shape retaining bag body 24 of the second embodiment may be omitted. That is, the two thin-walled connecting portions 22 and 22 of the raising member 20 are inserted into the upper and lower manhole frames to insert concrete or asphalt without inserting the shape retaining bag body 24 and reinforcing it. This is because the cylindrical shape is surely held against the external pressure.

  The present invention is not limited to the contents shown in the above embodiment, and various additions, modifications, or deletions are possible within the scope not departing from the gist of the present invention. It is included within the scope of the present invention.

  The raising frame for the septic tank of the present invention is required when the height of the manhole communicating between the buried septic tank main body and the ground surface where the manhole cover is installed differs from installation site to installation location. It is preferably used to form a manhole having a height.

1A, 1B Raising tank 2 for septic tank 2 Raising member 3 Flat body 4 Thin connection portion 7 Thin plate portion 8 Thick plate portion 9 Dividing groove 12 Shape retention member 20 Raising member 21 Flat body 22 Thin connection portion 23 Reinforcement tape member (reinforcing member) )
24 Shaped Bag 27 Fluid

Claims (6)

A septic tank raising frame connected to the upper opening of the septic tank body and having a height to raise the upper opening to the manhole cover,
It is integrally formed by molding with plastic, and has a flat plate-like outer shape in which both ends of each of the two flat plates arranged in an overlapping manner are connected to each other via a thin connecting portion having flexibility. A raising member provided with a deformation promoting means capable of bending and deforming a flat cylindrical body into a semi-cylindrical body,
In the use, the thinned connecting portion is attached to the raising member that is bent and deformed into a cylindrical body by the deformation promoting means so as to sandwich the thinned connecting portion from both inside and outside of the cylindrical body. And a shape-retaining member for holding a curved shape forming a part of the cylindrical body. The deformation promoting means is a thin plate portion provided on the opposite surface side of the two flat plates to each other, and a thickness larger than the thin plate portion on the opposite surfaces side of the flat plate. A cross section of an isosceles triangle whose apex angle is located on the boundary line between the thick plate portion provided in the thick plate portion and the thin plate portion in the thick plate portion, and is arranged to open toward the facing surface. A plurality of dividing grooves formed to divide the thick plate portion into a plurality of pieces,
2. The raising frame for a septic tank according to claim 1, wherein the raising member is curvedly deformed into a cylindrical body by bringing the opposing groove side walls of all the dividing grooves into close contact with each other in use. .   A large number of the divided grooves have isosceles triangular cross sections having a predetermined apex angle different for each arrangement position so that the thick plate portion is deformed into a cylindrical shape when the opposing groove side walls are brought into close contact with each other. The raised frame for a septic tank according to claim 2, which is set in a shape. A septic tank raising frame connected to the upper opening of the septic tank body and having a height to raise the upper opening to the manhole cover,
Equipped with a raised member integrally formed by plastic molding,
The raising member has a flat plate-like outer shape in which both side ends of two flat plates arranged in an overlapping manner are connected to each other via a thin-walled connecting portion,
A raising frame for a septic tank, characterized in that a deformation promoting means capable of bending and deforming each of the two flat plates into a semi-cylindrical body is provided. A septic tank raising frame connected to the upper opening of the septic tank body and having a height to raise the upper opening to the manhole cover,
A raising member having a flat plate-like outer shape, which is integrally formed by molding with plastic, and in which both side ends of two flat plates in an overlapping arrangement are connected to each other via a thin connecting portion having flexibility;
A raising frame for a septic tank comprising the thin-walled connecting portion and a reinforcing member joined to a peripheral portion thereof when the raising member is bent and deformed into a cylindrical body in use.   A shape-retaining bag body that is formed into a disk shape having a predetermined diameter by being filled with a fluid and is inserted into the raising member that is curved and deformed into a cylindrical body and holds the raising member in the cylindrical body is further provided. The raising frame for septic tanks according to claim 5, wherein

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