JP2001132079A - Invert joint and installation method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an invert joint improving the installation inside a manhole, and a work method for installing the invert joint in the manhole. SOLUTION: An invert joint 1 is constituted, by forming an FRP-made passage member 2 having an opening at the upper portion, a butyl rubber-based adhesive member respectively adhered to the rear surface of an FRP water passage member 2 located at a prescribed lower position from each upper end edge portion 21 of the FRP water passage member 2, a mortar layer 4 is laminated to the rear surface of the FRP water passage member 2, located between respective butyl rubber-based adhesive members 3 and integrated into one body. The amount of lamination of a mortar layer 4 is reduced from that of the conventional products, and the weight of the whole invert joint 1 is made smaller, and the invert joint 1 can be adhered surely to the bottom surface of the manhole, by utilizing the adhesive ability of the butyl rubber-based adhesive member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an invert joint used in a manhole and a method of installing the invert joint in a manhole.

[0002]

2. Description of the Related Art Heretofore, manholes have been buried and installed at regular intervals of a bent portion or a straight portion of a sewage pipe, and each manhole has a diversion line to prevent sewage and the like from stagnating on the bottom surface. Grooves, ie, inverts, are formed. The conventional invert is formed at the same time when the bottom of the manhole is constructed, or an invert joint made of concrete or the like is manufactured in advance, and is installed in the manhole when the manhole is constructed. In recent years, forming an invert during construction of a manhole in particular takes a long time and lowers the work efficiency, so invert joints made of concrete or the like are manufactured in advance as manhole parts at a factory, and when constructing a manhole, This invert joint is used as a part to be installed in a manhole.

As a conventional example in which such an invert joint is manufactured in a factory in advance, Japanese Utility Model Registration No. 2522059 (first conventional example) discloses, as shown in FIG. It is disclosed that an invert joint block (100) in which the upper end opening edge (101) is formed to have a constant angle (α) with an outwardly inclined slope formed by forming the channel into a flow path form communicating with a road. In Japanese Patent No. 2949276 (second conventional example), as shown in FIG. 10, a concave groove (202) for preventing rebound is formed in the lowermost part of a flow guide groove (201) having a semicircular cross section in the longitudinal direction. In addition, it is disclosed that an invert (200) having an upward rib (203) is provided at the upper end of the flow guide groove (201). Further, Japanese Utility Model Registration No. 2517524 (Third Conventional Example) discloses a plastic waterway material provided with a groove communicating with an inlet and an outlet, and a concrete table which is cast at a lower portion along the waterway material. To form an invert integrally.

[0004]

However, the above-described invert joint block (100) of the first conventional example is
The upper opening edge (101) is provided with a constant angle (α) of a downward slope, so that the manhole bottom surface can be efficiently and beautifully finished. Is molded from concrete, it has a considerable weight as a finished product, and its handling is inconvenient. In addition, since the flow path is integrally formed of concrete, there is a disadvantage that durability is inferior. The invert (200) of the second conventional example described above has a concave groove (202) for preventing rebound at the lowermost part of the flow guide groove (201), and an upward rib (200) at the upper end of the flow guide groove (201). 203), it is excellent in that the rebound of dirt contained in the sewage can be suppressed and the burden of management of the sewage pipeline can be reduced. However, since the entire invert is integrally formed from concrete, the first invert is formed. Similar to the conventional example, the weight of the finished product becomes considerably heavy, handling is inconvenient, and the durability is poor. Furthermore, in the invert of the third conventional example described above, since the waterway material is formed of plastic,
Although the channel can be beautifully finished, the concrete embedment layer must be cast on the outside of the invert to form the bottom of the manhole. There is a problem to be improved in terms of adhesion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to beautifully finish a flow guide groove, and to embrace an invert joint and concrete cast around the invert joint. It is an object of the present invention to provide an invert joint having improved adhesion with a finishing layer of a layer or mortar and a construction method for installing such an invert joint in a manhole.

[0006]

To achieve the above object, according to the first aspect of the present invention, there is provided a water channel material having a flow guiding groove opened upward, and a predetermined distance from each upper end edge of the water channel material. A butyl rubber-based adhesive is stuck to the lower surface of the channel material below, and a mortar layer is laminated and integrated on the back surface of the channel material located between the respective butyl rubber-based adhesive materials. With this configuration, the flow guide groove can be beautifully finished, and the butyl rubber-based adhesive can be used to project the upper edge of the channel material upward and sandwich the mortar layer laminated on the channel material. Since the mortar layer is laminated on the back surface of the material, the amount of the mortar layer laminated can be smaller than that of the conventional product, so that the weight of the entire invert joint can be reduced. Furthermore, since the butyl rubber-based adhesive material is provided in a portion near the bottom surface of the manhole, the invert joint and the holding layer or the finishing layer can be securely bonded.

In order to achieve the above object, a second aspect of the present invention is the invention according to the first aspect, wherein the waterway material is made of FRP.
It is characterized by being composed of a water making channel material. With this configuration, the durability of the waterway material can be further increased, and the flow guide groove can be more beautifully finished.

Further, in order to achieve the above object, the invention of claim 3 is the invention of claim 1 or claim 2, wherein the thickness of the butyl rubber-based pressure-sensitive adhesive is set to be substantially the same as the thickness of the mortar layer. It is characterized by forming. With this configuration, the end of the mortar layer laminated and integrated on the back surface of the waterway material is reliably protected by the butyl rubber-based adhesive, and the amount of the mortar layer laminated is reduced to reduce the weight of the entire invert joint. Can be reduced.

Furthermore, in order to achieve the above object,
According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the upper surface of the butyl rubber-based adhesive is formed substantially parallel to a line connecting each upper edge of the waterway material. With this configuration, the thickness of the embedment layer or finish layer that is cast at the connection between the invert joint and the embrace layer or finish layer, that is, from the bottom of the manhole to the top surface of the butyl rubber-based adhesive material Since the thickness of the embedment layer or finishing layer can be formed to a predetermined thickness, concrete or mortar at the connection portion between the invert joint and the bottom of the manhole can be prevented from peeling off.

Further, in order to achieve the above object,
The invention according to claim 5 is to form a channel material having a flow guide groove opened upward, and to adhere a butyl rubber-based adhesive material to the back surface of the channel material a predetermined distance below each upper edge of the channel material. An invert joint obtained by laminating and integrating a mortar layer on the back surface of the waterway material located between the respective butyl rubber-based adhesive materials,
It is installed in a manhole so as to correspond to the inflow pipe and the outflow pipe, and then the concrete or mortar embedment layer has a substantially conical concave curved surface up to the height at which the butyl rubber-based adhesive is located. And then,
A mortar finishing layer is coated above the embedment layer so that the upper surface thereof has a substantially conical concave curved surface, with each upper end edge of the waterway material being a plaster ruler. With this configuration, when an invert is formed on the bottom surface of the manhole, an invert joint having a flow guide groove formed in accordance with the inflow pipe and the outflow pipe provided in the manhole is prepared. With the joints corresponding to the inflow and outflow lines, simply placing a concrete or mortar embedment layer around the invert joints,
A desired invert can be easily formed on the bottom of the manhole. At this time, the embedding layer and the finishing layer are firmly adhered and fixed on the contact surface with the butyl rubber-based adhesive.

Furthermore, in order to achieve the above object,
The invention according to claim 6 is to form a channel material having a flow guide groove opened upward, and affix a butyl rubber-based adhesive to a back surface of the channel material at a predetermined distance below each upper edge of the channel material. An invert joint obtained by laminating and integrating a mortar layer on the back surface of the waterway material located between the respective butyl rubber-based adhesive materials,
It is mounted and installed on the upper surface of the pedestal block installed in the manhole in a state corresponding to the inflow pipe and the outflow pipe, and then the concrete or mortar embedment layer is raised to the height where the butyl rubber-based adhesive is located. The upper surface is cast into a substantially conical concave curved surface, and further, the upper end edge of the waterway material is used as a plaster ruler, and a mortar finishing layer is formed above the embedment layer to have a substantially conical concave curved surface. It is characterized by being coated as follows. With this configuration, when forming an invert on the bottom of the manhole,
An invert joint having a flow guide groove formed in accordance with the inflow pipe and the outflow pipe arranged in the manhole and a pedestal block having a predetermined height are prepared, and the invert joint mounted on the pedestal block is supplied. A desired invert can be easily formed on the bottom surface of the manhole simply by placing a concrete or mortar embedment layer around the invert joint in a state corresponding to the pipeline and the outflow pipeline. At this time, the embedding layer and the finishing layer are firmly adhered to the contact surface with the butyl rubber-based adhesive, and the embedding layer is cast with the invert joint mounted on the pedestal block. Positioning is easier.

Furthermore, in order to achieve the above object,
According to a seventh aspect of the present invention, in the fifth or sixth aspect, the embedment layer is also used as a finishing layer, each upper edge of the waterway material is set as a left ruler, and the upper surface of the finishing layer is substantially conically concave. It is characterized by being cast into a curved surface. With this configuration, the work of finishing the bottom of the manhole becomes easier.

Further, in order to achieve the above object,
According to an eighth aspect of the present invention, in any one of the fifth to seventh aspects of the present invention, the waterway material is made of an FRP waterway material. With this configuration, the durability of the waterway material can be increased, and the flow guide groove can be finished more beautifully.

Further, in order to achieve the above object,
According to a ninth aspect of the present invention, in any one of the fifth to eighth aspects, the thickness of the butyl rubber-based adhesive is formed to be substantially the same as the thickness of the mortar layer. With this configuration, it is possible to reliably protect the end of the mortar layer integrated with the back surface of the waterway material, and reduce the amount of the mortar layer to reduce the weight of the entire invert joint. Therefore, handling of the invert joint during installation work of the invert joint becomes easier.

Further, in order to achieve the above object,
A tenth aspect of the present invention is characterized in that, in any one of the fifth to ninth aspects, the upper surface of the butyl rubber-based adhesive is formed substantially parallel to a line connecting the upper end edges of the waterway material. With this configuration, the thickness of the embedment layer or finish layer that is cast at the connection between the invert joint and the embrace layer or finish layer, that is, from the bottom of the manhole to the top surface of the butyl rubber-based adhesive material Since the thickness of the embedment layer or the finishing layer can be formed to a predetermined thickness, the concrete or mortar at the connection portion between the invert joint and the bottom of the manhole can be reliably prevented from peeling off. .

The invert joint according to the present invention is basically constructed as described above. The invert joint is formed from each upper edge of a channel material integrally formed of concrete, resin mortar or hard synthetic resin, into a flow guiding groove. By extending the rib portion having a thickness smaller than the thickness upward, a predetermined step is formed between the flow guiding groove portion and the rib portion, and a butyl rubber-based adhesive material is attached to the step portion. Is also good. With this configuration, when installing the invert joint in the manhole, the upper edge of each rib can be used as a plaster ruler to cast a concrete or mortar embedment layer. Utilizing the adhesiveness of the butyl rubber-based pressure-sensitive adhesive material provided at each step portion, the invert joint and the bottom of the manhole can be securely bonded and beautifully finished.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An invert joint according to an embodiment of the present invention will be described with reference to FIGS. The invert joint (1) according to this embodiment is provided with an FRP (fiber reinforced plastic) waterway material (provided with a flow guide groove communicating with an inflow pipe and an outflow pipe for sewage and the like provided in a manhole). 2) a butyl rubber-based adhesive material (3) attached to the FRP waterway material (2) downward by a predetermined distance from each upper edge (21) substantially in parallel with each upper edge (21); This invert joint is formed substantially linearly from a mortar layer (4) having a predetermined thickness laminated and integrated on the back surface of the FRP waterway material (2) located between the butyl rubber-based adhesive materials (3). (1) is manufactured in advance in a factory as a component part of a manhole. Hereinafter, each component requirement will be described.

The FRP waterway material (2) is formed by a forming die (not shown) so as to form a predetermined flow guide groove. In this case, both ends of the substantially semicircular FRP waterway material (2) are extended upward by a predetermined amount, and the upper end edge (21) of the FRP waterway material (2) is integrally formed. By forming in this manner, the invert joint (1) can be used when constructing the manhole.
The thickness of the covering layer between the concrete embedment layer (5) and the mortar finishing layer (6) and the butyl rubber-based adhesive (3), which are cast to embrace the concrete, is set to a sufficient thickness, that is, The thickness of the coating layer from the bottom surface of the manhole to the top surface of the butyl rubber-based adhesive can be made sufficient. The channel material (2) can be formed of another plastic material such as vinyl chloride or a metal material such as stainless steel.

The upper edge (21) of the FRP waterway material (2)
Since the butyl rubber-based adhesive (3) adhered downward a predetermined distance from the mortar or the ready-mixed concrete has a property of firmly adhering to the fresh mortar or the ready-mixed concrete as the hardening reaction of the ready-mixed mortar or the ready-mixed concrete proceeds. When assembling the invert joint (1) according to the present embodiment in a manhole,
The butyl rubber-based adhesive (3) functions as an adhesive between the invert joint (1) and the concrete embedment layer (5) or the mortar finish layer (6), and firmly inserts the invert joint into the manhole. Can be adhesively fixed. Since the butyl rubber-based adhesive (3) has an adhesive property, dust and the like are easily attached thereto. Therefore, the surface of the butyl rubber-based adhesive (3) is coated with a water-soluble outer skin, for example, an outer cover made of polyvinyl alcohol. It is convenient to coat with. The polyvinyl alcohol shell dissolves in the water in the concrete and does not need to be removed when the concrete embedment layer or mortar finish layer is cast.

A mortar layer (4) having a predetermined thickness laminated and integrated on the back surface of the FRP water channel material (2) located between the butyl rubber-based adhesive materials (3) is embraced by the invert joint (1). In consideration of the adhesiveness to the layer (5), it is advantageous to form an integrated laminate over almost the entire back surface of the FRP waterway material (2), but the weight of the entire invert joint (1) is considerably large. It will be heavy. Therefore, in the case of the invert joint (1) according to the present embodiment, at least the portion above the sticking portion of the butyl rubber-based adhesive (3) is reduced in the amount of the mortar layer laminated to reduce the invert joint (1). The overall weight is reduced. When the mortar layer (4) is laminated on the back surface of the FRP waterway material (2),
In order to improve the adhesiveness between the FRP waterway material (2) and the mortar layer (4), sand or the like is formed on the back surface serving as the bonding surface with the mortar layer (4) when molding the FRP waterway material (2). May be adhered. Moreover, the mortar layer laminated and integrated on the back surface of the waterway material may be resin mortar, resin concrete, or the like.

Next, an invert joint according to another embodiment of the present invention will be described with reference to FIG. This embodiment differs from the embodiment according to FIGS. 1 and 2 in that the flow guide groove of the invert joint (1A) is formed in a shape where a straight part and a curved part intersect. The essential components are configured in the same manner as in the embodiment according to FIGS.
In this embodiment, the invert joint (1A) is made of FR
The water channel material (2A) made of P and the upper end edge (21A) of the water channel material (2A) made of FRP are stuck substantially parallel to the upper edge (21A) of the water channel material (2A). A mortar layer (4A) having a predetermined thickness laminated and integrated on the back surface of the FRP water channel material (2A) located between the butyl rubber-based adhesives (3A) and the respective butyl rubber-based adhesives (3A). ing. The invert joint has a T-shape, a Y-shape, a straight shape as shown in FIGS. 1 and 2, or a shape in which a straight portion and a curved portion intersect as shown in FIG.
Alternatively, it can be formed in any other shape, and can be formed in an appropriate shape in accordance with the arrangement position of the inflow pipe and the outflow pipe provided in the manhole.

An invert joint according to still another embodiment of the present invention will be described with reference to FIG. In this embodiment, the FRP waterway material (2B) forming the flow guide groove of the invert joint (1B) is formed by joining the upper edge (21B) of the substantially semicircular FRP waterway material (2B) along a circular shape. And is formed to extend upward by a predetermined amount. That is, the interval between the upper edge portions (21B) located on both sides is formed to be narrower than the maximum width of the flow guide groove portion of the FRP waterway material (2B). Other components are configured in the same manner as in the embodiment according to FIGS. 1, 2, and 5. By forming in this manner, it is possible to effectively prevent the sewage flowing in the flow guiding groove from bouncing to the bottom surface in the manhole.

Next, referring to FIGS. 3 and 4, FIGS.
Invert joint (1) according to the embodiment of the present invention shown in FIG.
A construction method for forming an invert in a manhole using the method will be described. In this case, the manhole is provided with a wall rising portion (7) placed on a bottom plate (8), and the wall rising portion (7) is provided with an inflow pipe (9) and an outflow pipe in a substantially straight line at a predetermined inclination. It is assumed that the road (10) is connected. (1) First, both ends of the invert joint (1) formed to a predetermined length in the wall rising portion (7) are set so as to correspond to the inflow pipe (9) and the outflow pipe (10). In this case, after the concrete base (which becomes a part of the concrete embedment layer) is formed in the manhole to such a height that the back surface of the invert joint (1) can be grounded, the invert joint (1) is placed on the concrete base. Set,
Alternatively, the invert joint (1) may be set using a specific fixing tool. (2) Next, a concrete or mortar embedment layer (5) is cast so as to embrace the back surface of the invert joint (1) to a height at which the butyl rubber-based adhesive (3) is located.
In this case, concrete or mortar embedment layer (5)
Is formed in a substantially conical concave surface so as to have substantially the same shape as the bottom surface of the manhole to be completed. (3) Finally, using the upper end edge (21) of the FRP waterway material (2) as a plaster ruler, the upper surface of the concrete or mortar embedment layer (5) and the upper surface of the butyl rubber-based adhesive material (3) are used. A mortar finish layer (6) is formed to cover to the level of each top edge (21). In this construction method, the case where concrete or mortar is cast separately into the embedment layer (5) and the finish layer (6) has been described, but the embrace layer (5) is used as the finish layer (6). Alternatively, the upper surface of the finishing layer (6) may be formed to have a substantially conical concave curved surface. With this configuration, the construction process can be further simplified.

Next, another construction method for forming an invert in a manhole using the invert joint (1) according to the embodiment of the present invention shown in FIGS. 1 and 2 will be described with reference to FIG. Also in this embodiment, the manhole is
A wall rising part (7) is placed on the bottom plate (8), and the inlet pipe (9) and the outlet pipe (10) are connected to the wall rising part (7) almost linearly at a predetermined inclination. It is assumed that (1) First, a pair of height-adjustable concrete pedestal blocks (11) are installed at predetermined intervals on a bottom plate (8) in a manhole. In this case, the invert joint (1)
Height adjusting screw (13) screwed to the cylindrical nut (12) so that both ends of the base block (11) coincide with the inflow conduit (9) and the outflow conduit (10). ) To adjust. (2) Next, an invert joint (1) formed to a predetermined length in a recess formed on the upper surface of each pedestal block (11).
Are set in correspondence with the inflow conduit (9) and the outflow conduit (10). (3) After that, hold the concrete or mortar so as to embrace the back surface of the invert joint (1) until the butyl rubber-based adhesive material (3) stuck on the back surface of the FRP waterway material (2) is located. An embedding layer (5) is cast. in this case,
The upper surface of the concrete or mortar embedment layer (5) is formed into a substantially conical concave curved surface so as to have substantially the same shape as the bottom surface of the manhole to be completed. (4) Finally, using the upper edge (21) of the FRP waterway material (2) as a plaster ruler, the upper surface of the concrete or mortar embedment layer (5) and the upper surface of the butyl rubber-based adhesive material (3) are used. A mortar finish layer (6) is formed to cover to the level of each top edge (21). In this construction method, the case where concrete or mortar is cast separately into the embedment layer (5) and the finish layer (6) has been described, but the embrace layer (5) is used as the finish layer (6). Alternatively, the upper surface of the finishing layer (6) may be formed to have a substantially conical concave curved surface. FIG. 5 shows an invert joint (1) according to another embodiment of the present invention.
As shown in FIG. 6, the construction method for forming an invert in a manhole by using A) includes two inlet pipes (9) and 1
The only difference from the construction method shown in FIGS. 3, 4 and 7 in that two outflow conduits (10) are disposed in the manhole, and the other working steps are almost the same. A detailed description thereof will be omitted.

[0025]

According to the first aspect of the present invention, the flow channel can be beautifully finished by molding the channel material separately, and the upper end edge of the channel material projects upward, Since the butyl rubber-based adhesive is adhered to the back surface of the waterway material so as to sandwich the mortar layer to be laminated on the waterway material, the amount of the mortar layer laminated can be reduced as compared with the conventional product, and the weight of the entire invert joint can be reduced. . Further, since the butyl rubber-based adhesive is provided so as to be located near the bottom of the manhole, the invert joint can be firmly adhered and fixed by the embed layer or the finishing layer.

According to the invention of claim 2, the waterway material is made of FRP
By forming it, the durability of the waterway material can be further increased, and the flow guide groove can be finished more beautifully.

According to the third aspect of the present invention, the end of the mortar layer laminated and integrated on the back surface of the channel material can be protected by the butyl rubber-based adhesive, and the mortar layer can be laminated and integrated on the back surface of the channel material. The amount of the mortar layer laminated can be reduced compared to the conventional product, and the weight of the entire invert joint can be reduced.

According to the fourth aspect of the present invention, the thickness of the embedment layer or the finishing layer which is cast at the connection portion between the invert joint and the embedment layer or the finishing layer, that is, the butyl rubber-based adhesive Since the thickness of the embedment layer or finishing layer up to the upper surface of the material can be formed to a predetermined thickness, it is ensured that the concrete at the connection between the waterway material forming the invert joint and the bottom of the manhole will peel off. Can be prevented.

According to the fifth aspect of the present invention, when the invert is formed on the bottom surface of the manhole, an invert joint having a guide channel formed in accordance with the inflow pipe and the outflow pipe provided in the manhole is prepared. By simply placing a concrete or mortar embedment layer around the invert joint with the invert joint corresponding to the inflow pipe and the outflow pipe, the desired invert can be easily formed on the bottom of the manhole. Can be formed. At this time, the embedding layer and the finishing layer can be firmly adhered and fixed at the contact surface with the butyl rubber-based adhesive.

According to the sixth aspect of the present invention, when the invert is formed on the bottom surface of the manhole, the invert joint formed with the inflow conduit and the outflow conduit arranged in the manhole and a predetermined joint are formed. A height-adjustable pedestal block having a height is prepared, and concrete or mortar is placed around the invert joint with the invert joint mounted on the pedestal block being matched with the inflow pipe and the outflow pipe. The desired invert can be easily formed on the bottom of the manhole only by placing the embedment layer. At this time, the embedding layer and the finishing layer can be firmly adhered and fixed on the contact surface with the butyl rubber-based adhesive,
Since the concrete embedment layer is cast in a state where the invert joint is placed on the pedestal block, the positioning of the invert joint becomes easier.

According to the seventh aspect of the present invention, since the construction process can be simplified, the work of finishing the bottom of the manhole becomes easier.

According to the eighth aspect of the invention, the durability of the waterway material can be increased, and the invert joint and the embedment layer can be securely bonded and fixed via the butyl rubber-based adhesive.

According to the ninth aspect of the present invention, it is possible to protect the end of the mortar layer laminated and integrated on the back surface of the waterway material and reduce the amount of the mortar layer laminated to reduce the weight of the entire invert joint. Therefore, the handling operation of the invert joint when the invert joint is installed in the manhole becomes easier.

According to the tenth aspect of the present invention, the thickness of the embedment layer or the finishing layer which is cast at the connecting portion between the invert joint and the embedment layer or the finishing layer, that is, the butyl rubber-based adhesive Since the thickness of the embedment layer or finishing layer up to the upper surface of the material can be formed to a predetermined thickness, it is ensured that the concrete at the connection between the waterway material forming the invert joint and the bottom of the manhole will peel off. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of an invert joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the invert joint according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a construction state of the invert joint according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view different from FIG. 3, illustrating a construction state of the invert joint according to the embodiment of the present invention.

FIG. 5 is a perspective view of an invert joint according to another embodiment of the present invention.

FIG. 6 is a top view showing a construction state of an invert joint according to another embodiment of the present invention shown in FIG.

FIG. 7 is a cross-sectional view showing a construction state of an invert joint according to still another embodiment of the present invention.

FIG. 8 is a sectional view of an invert joint according to still another embodiment of the present invention.

FIG. 9 is a perspective view of an invert joint according to a conventional example.

FIG. 10 is a perspective view of an invert joint according to another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Invert joint 2 Waterway material 3 Butyl rubber-based adhesive material 4 Mortar layer 5 Embedding layer 6 Finishing layer 11 Pedestal block 21 Upper edge of waterway material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideaki Takahashi 1-1-11-60 Sumiyoshi, Soka City, Saitama Prefecture Inside Nippon Step Industries Co., Ltd. (72) Inventor Kazuhito Ohno 4-1-1, Satoyoshi, Kofu-shi, Yamanashi F-term (reference) 2D047 BA29 2D063 DA21 DA22 DA30

Claims (10)

[Claims] A butyl rubber-based adhesive material is adhered to a back surface of said channel material, which is provided at a predetermined distance below each upper edge of said channel material, wherein said channel material has a flow guide groove opened upward; An invert joint, wherein a mortar layer is laminated and integrated on the back surface of the water channel material located between the butyl rubber-based adhesives. 2. The invert joint according to claim 1, wherein the waterway material is an FRP waterway material. 3. The invert joint according to claim 1, wherein the butyl rubber-based pressure-sensitive adhesive is formed to have substantially the same thickness as the mortar layer. 4. An apparatus according to claim 1, wherein an upper surface of said butyl rubber-based adhesive is formed substantially in parallel with a line connecting upper end edges of said waterway material. Invert fittings. 5. A channel material having a flow guide groove opened upward, and a butyl rubber-based adhesive is stuck on the back surface of the channel material a predetermined distance below each upper edge of the channel material. An invert joint obtained by laminating and integrating a mortar layer on the back surface of the waterway material located between the butyl rubber-based adhesive materials is installed in a manhole so as to correspond to an inflow pipe and an outflow pipe, and thereafter, the butyl rubber-based An embedding layer of concrete or mortar is cast so that the upper surface thereof has a substantially conical concave curved surface up to the height at which the adhesive material is located, and furthermore, the upper end edge of the waterway material is used as a plaster ruler to form the embedding layer. A method for constructing an invert joint, wherein a mortar finishing layer is coated above the layer such that the upper surface thereof has a substantially conical concave curved surface. 6. A channel material having a flow guide groove opened upward, and a butyl rubber-based adhesive is stuck on the back surface of the channel material at a predetermined distance below each upper edge of the channel material. An invert joint in which a mortar layer is laminated and integrated on the back surface of the waterway material located between the butyl rubber-based adhesive materials is mounted on the upper surface of a pedestal block installed in a manhole in a state corresponding to the inflow pipe and the outflow pipe. After that, an embedding layer of concrete or mortar is cast so that the upper surface thereof has a substantially conical concave curved surface up to a height at which the butyl rubber-based adhesive is located. A method of constructing an invert joint, wherein a finishing layer of mortar is coated above the embedment layer so that the upper surface thereof has a substantially conical concave curved surface. 7. The casting layer is also used as the finishing layer, and the upper end edge of the waterway material is used as a plaster ruler, and the finishing layer is cast so that the upper surface thereof has a substantially conical concave curved surface. The method for constructing an invert joint according to claim 5 or 6, wherein: 8. The method according to claim 5, wherein the waterway material is an FRP waterway material. 9. The construction of an invert joint according to claim 5, wherein said butyl rubber-based adhesive is formed to have a thickness substantially equal to a laminated thickness of said mortar layer. Method. 10. The butyl rubber-based adhesive material according to claim 5, wherein an upper surface of the butyl rubber-based adhesive material is formed substantially in parallel with a line connecting upper end edges of the waterway material. Construction method of invert fittings.