JPH11241355A - Invert joint for manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an invert joint in which an invert gutter formed of synthetic resin is prevented form being deformed or displaced owing to floating thereof during or after placing of ready-mixed concrete. SOLUTION: An invert joint 1 is installed on an upper surface of a conrecte foundation placed on a bottom of a manhole M to form an invert flow passage to smoothly connect a sewage inflow port 12 to a sewage outflow port 13 opened in an inner circumferential wall of the manhole M respectively. It comprises an invert gutter 2 of resin to be engaged between the sewage inflow port 12 and the sewage outflow port 13 to form the invert flow passage, and reinforcement rods 15, 15 of rigid material fixed on both sides of the invert gutter 2 to prohibit deformation of the invert gutter 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an invert joint for forming an invert flow path connecting a sewage inflow pipe and a sewage outflow pipe in a manhole for sewage or rainwater.

[0002]

2. Description of the Related Art At the bottom of a manhole, it is necessary to form an invert flow path having a smooth flowing water surface so as not to obstruct the flow of sewage and prevent foreign matter from accumulating. The conventional construction method (construction method) of forming an invert channel with mortar on a cast concrete base requires skill, it is difficult to secure a scaffold for workers, work is difficult, and the concrete base hardens. Until the construction of the mortar was not possible, it took time to implement.

For this reason, there has been proposed a method of forming an invert channel using a ready-made concrete block. However, concrete blocks are heavy,
Lowering from the mouth of the manhole to the bottom is dangerous and difficult and requires the installation of concrete blocks before the manhole is installed. Also, in this method,
When the position of the sewer main line shifts, construction work to change the invert channel is required.

[0004]

The conventional invert joint method in which a gutter structure is formed of a synthetic resin solves the disadvantages of the conventional method, but has the following problems. B) In the operation of pouring ready-mixed concrete into the space below the invert joint, buoyancy is applied to the invert joint, so that the synthetic resin gutter rises and a smooth inclined flow path having the designed direction cannot be formed. B) Due to the setting of the invert joint, the worker cannot get on the invert joint and lay the ready-mixed concrete. C) Since there is no means for fixing the invert joint in the manhole, the position of the invert joint cannot be accurately kept at the inlet and outlet of the sewage during construction.

An object of the present invention is to provide an invert joint which can prevent an invert gutter formed of a synthetic resin from being raised and deformed or displaced during or after setting of ready-mixed concrete. An object of the invention according to claim 6 or 7 is to provide an invert joint in which a gutter formed of synthetic resin can be securely fixed to the inner wall of a manhole and displacement and deformation of the invert gutter can be more firmly prevented. .

[0006]

The invention according to claim 1 is characterized in that the inlet and outlet of sewage, which is installed on the upper surface of foundation concrete cast at the bottom of a manhole and is opened on the inner peripheral wall of the manhole, are smooth. An invert joint for forming an invert flow path connected to the resin, the resin, concrete or ceramic pipe invert gutter fitted between the inflow port and the outflow port to form an invert flow path, A reinforcing rib provided on an outer surface of the invert gutter to prevent deformation of the invert gutter.

[0007]

According to the first to fifth aspects of the present invention,
Since there is a reinforcing rib provided on the outer surface of the invert gutter to prevent deformation of the invert gutter, deformation, displacement and deflection of the invert joint can be prevented. For this reason, during and after construction where concrete is poured from the gap between the invert joint and the inner peripheral wall of the manhole, the position of the invert joint is displaced, deformed, and the inclination of the flow path changes due to lifting. Can be prevented. When the reinforcing ribs are formed integrally with the invert gutter using resin, there is an advantage that the manufacturing cost is reduced and the fixing force to the foundation concrete is increased.

According to the structure of the sixth aspect, the invert joint having the gutter formed of synthetic resin can be securely fixed to the inner wall of the manhole by a simple operation of turning a screw, and the invert gutter rises due to a synergistic effect with the reinforcing rib. Displacement and deformation can be reliably prevented. In the configuration according to claim 7,
A support rod having a length adjusting screw is attached to the curved invert gutter, and the support rod is arranged in a substantially Y-shape to fasten the invert gutter to the inner wall surface of the manhole. It is effective for fixing a curved invert gutter, and the same operation and effect as above can be obtained. When the invert gutter is large or has a large curvature, a plurality of support rods are provided.

According to the structure described in claim 8, since the reinforcing rod is inexpensive and strong, and has a large weight, it is advantageous for preventing the invert gutter from rising and deforming. According to the configuration of the ninth aspect, it is easy to mold the gutter with the resin, and it is convenient to carry, and can be applied to inverts of various shapes by a combination. If the invert gutter is large and the mouth of the manhole is small, it can be assembled in the manhole.

[0010]

1 to 4 show an invert joint 1 according to a first embodiment of the present invention, in which a concrete base 11 is cast at the bottom of a manhole M which is a cylindrical structure made of concrete. It is installed on the upper surface of the sewage system (see FIG. 2), and forms an invert channel having a smooth flowing water surface so as not to obstruct the flow of sewage and prevent foreign matter from accumulating. Side holes H, H of a circular cross section having a predetermined orientation and a certain level difference according to the sewer piping design are provided on the side walls of the manhole M.
Are drilled.

In this embodiment, the horizontal holes H, H are formed such that the centers of the holes pass through the center of the manhole M. Ends of the sewage main pipes P, P are inserted into the lateral holes H, H and are connected in a watertight manner, and form a sewage inlet 12 and a sewage outlet 13. As the sewage main pipe P, a fume pipe, a ceramic pipe, a vinyl chloride pipe, or the like is appropriately used depending on the application. The invert joint 1 smoothly connects the sewage inlet 12 and the sewage outlet 13 while maintaining a gentle inclination.

The invert joint 1 is made of vinyl chloride, FRP
It has an invert gutter 2 having an arc (reverse arch) cross section formed of resin such as. The invert gutter 2 is formed to be slightly shorter than the length of the invert flow path between the sewage inlet 12 and the sewage outlet 13, and a flange integrally formed with the invert gutter 2 with resin is provided on the outer surfaces of both ends. 21, 2
2 project from both sides. The flanges 21 and 22 may be formed separately and fixed to the end of the invert gutter 2.

On both sides of the invert gutter 2, three brackets 14 each having a substantially L-shape and having an upper opening are arranged in a row.
Iron reinforcing rods 15, 15 having the same length as the invert gutter 2 are fitted into the bracket 14 in parallel with the invert gutter 2. The reinforcing rods 15 and 15 function as reinforcing ribs of the present invention. For fixing to the invert gutter 2, fitting to the groove other than the bracket 14, and bonding and fastening to the outer surface or the groove of the invert gutter 2 are performed. All fastening methods such as fastening by means can be adopted.

The bracket 14 may be made of resin molded integrally with the invert gutter 2 or may be made of iron with the base buried in the wall surface of the invert gutter 2. Reinforcement rod 15
May be one, or may have an integral molded transverse bone. Further, the material of the reinforcing rod 15 may be another metal as long as it is a rigid body, but is preferably made of steel from the viewpoint of reducing manufacturing costs and securing weight.

A screw hole 23 is formed in each of the flanges 21 and 22, and a bolt 24 is screwed into each screw hole 23. Each bolt 24 is turned and screwed in with a tool such as a wrench to protrude outward from both end surfaces 1A and 1B of the invert gutter 2 and abut against the inner wall surface of the manhole M around the sewage inlet 12 and the sewage outlet 13. Flange 21, 2
2 may be either one, and a flange formed in a semi-flange shape along the entire outer peripheral surface of the end of the invert gutter 2 is also effective. Further, a number of screw holes 23 may be formed in the flanges 21 and 22 to screw the bolts 24 together, and the bolts 24 may be other types of screws.

A predetermined number of pillars 3 are arranged in a row on the lower surface of the invert gutter 2. In this embodiment, the pillar 3 is composed of a leg screw 31 whose head is embedded and fixed in the bottom wall of the invert gutter 2 and a cap nut-shaped foot member 32 screwed to a lower end of each leg screw 31. Become. The length of the pillar 3 can be increased or decreased by turning the cap nut-shaped foot member 32 with a tool such as a spanner, and the height of the invert gutter 2 can be adjusted. The number and mounting position of the pillars 3 are appropriately set according to the size and shape of the invert gutter 2. It should be noted that the pillar 3 can have a combination of an external screw and an internal screw of another shape as long as the length of the pillar 3 can be expanded and contracted by using screwing.

In this embodiment, the invert gutter 2 is divided into an inlet gutter 2A, an intermediate gutter 2B, and an outlet gutter 2C, and is integrated by bonding. The flanges 21 and 22 are formed at the ends of the inlet gutter 2A and the outlet gutter 2C, and the pillar 3 is located at the center of the lower surface of the inlet gutter 2A, the intermediate gutter 2B and the lower surface of the outlet gutter 2C. Book is provided. Further, a pair of brackets 14 are provided on both sides of the inlet gutter 2A, the intermediate gutter 2B, and the outlet gutter 2C.

Although the invert gutter 2 may be integrally formed of resin, as in this embodiment, by dividing the invert gutter 2 into three parts, it is easy to manufacture a mold used when manufacturing the invert gutter 2. . For this reason, at the factory, the inlet gutter 2A,
When designing and manufacturing the intermediate gutter 2B and the outlet gutter 2C,
Invert gutters 2 with high productivity and high precision can be mass-produced at low cost. Also, by properly combining each gutter,
For example, a large number of inverted joints with different lengths and different curvatures can be formed with a relatively small number of parts. further,
Each gutter has a small size, which is convenient for transportation. In addition, when the entrance of the manhole M is small, there is an advantage that the gutter can be taken into the manhole M as it is divided into three and assembled inside.

As shown in FIG. 4, the structure of the joining portion is a lower (outer) thin portion 25 formed at one end of a gutter to be joined.
And the upper (inner) thin portion 26 formed on the other side, and
A projection 27 provided on one of the thin portion 25 and the thin portion 26 is fitted with a recess 28 provided on the other,
Secure with adhesive. In addition, it may be divided into two or four or more. When the width of the gutter is large, the second part shown in FIG.
As in the embodiment, it is also possible to divide into six in the longitudinal direction as shown in 2a to 2f.

The invert joint 1 is manufactured and assembled in the following procedure, and is used for forming an invert flow path at the bottom of the manhole M. B) According to the positions and dimensions of the manhole M, the sewage main pipe P, and the horizontal hole H, a mold is manufactured in advance at a factory to form the inlet gutter 2A, the intermediate gutter 2B, and the outlet gutter 2C, and the bolt 24, the pillar 3 is attached. B) A supporting member B such as a brick or a concrete block is installed at a predetermined position on the bottom of the manhole M in accordance with the sewage inlet 12, the sewage outlet 13, and the pillar 3, and the manhole M is installed.
The invert gutter 2 in which the reinforcing rods 15 are fitted to the brackets 14 is integrated on the inside or outside of the bracket 14 and is installed on the support member B.

C) Turn the foot member 32 to adjust the height of the invert gutter 2, and turn the bolt 24 to
4 is pressed against the inner wall surface of the manhole M around the sewage inlet 12 and the sewage outlet 13. D) As a result, the invert joint 1 is fixed to the side wall of the manhole M, so that the ready-mixed concrete is poured into the bottom of the manhole M from the gap to form the concrete base 11. E) The mortar is used to form a gap between the surface of the concrete base 11 and the flanges 21 and 22 and the wall surface of the manhole M. In this operation, the worker can perform the operation by placing his foot on the invert gutter 2.

In this embodiment, since the invert gutter 2 is reinforced by the reinforcing rods 15, 15, the position of the invert gutter 2 is influenced by the buoyancy received from the ready-mixed concrete during and after construction of the ready-mixed concrete into the bottom of the manhole M. Troubles such as shifting and deformation can be prevented. Also, the surface of the concrete base 11 and the flanges 21 and 22 and the manhole M
Work to form a gap with the wall surface of the second member is possible. further,
By firmly fixing the invert joint 1 in the manhole M with the bolt 24, the effect of preventing the displacement and deformation of the invert gutter 2 is further increased.

FIG. 6 shows a third embodiment. In this embodiment, the sewage inlet 12 and the sewage outlet 1 of the manhole M are used.
3 are formed at an angle. For this reason, the invert joint 1 has a curved gutter 2D in which an intermediate portion of the invert gutter 2 is smoothly curved.
Curved reinforcing bars 15, 15 are fixed in parallel.
A support rod 4 is attached to the outside of the curved gutter 2D. The length of the support rod 4 can be adjusted by screwing the nut 41 and the screw rod 42 together. The support rod 4 is disposed in a substantially Y-shape with respect to the invert gutter 2 and supports the invert gutter 2 from the side.

The invert joint 1 is fixed to the inner wall of the manhole M by turning the nut 41 together with the bolt 24. In addition, when it is difficult to fix with one support rod 4 such as when the curvature of the curved gutter 2D is large, a plurality of support rods 4 are used. As the structure of the support rod 4, a combination of other types of external screw and internal screw can be employed as long as the structure can be expanded and contracted by using screw engagement. Further, the support rod 4 may be formed by integrally forming the inner screw or the outer screw with the invert gutter 2 and screwing the inner screw or the outer screw with a member having the outer screw or the inner screw.

FIG. 7 shows a fourth embodiment. In this embodiment, two sewage inlets 12, 12 and one sewage outlet 13 of the manhole M are formed at an angle.
For this reason, three reinforcing rods 15 are also used, and the invert gutter 2 is formed into four parts including a substantially Y-shaped intermediate gutter 2E. In this way, the invert gutter 2 can be manufactured in a desired shape according to the arrangement of the sewage pipe.

FIG. 8 shows a fifth embodiment. In this embodiment, the semicircular reinforcing rod 16 is hooked and fixed to the bracket 14, and when the foot is put on the invert gutter 2, the invert gutter 2 expands or the width of the invert gutter 2 is increased by the pressure of the ready-mixed concrete. Is prevented from narrowing. This reinforcing rod 1
If 6 is used in combination with the reinforcing rod 15, the effect of the present invention is naturally increased.

FIGS. 9 and 10 show a sixth embodiment. In this embodiment, a reinforcing rib 17 made of resin and integrally formed on the outer wall of the invert gutter 2 is employed. Reinforcing rib 1
Numeral 7 may be a longitudinal rib shown in FIG. 9 or a circumferential rib shown in FIG. 10, and both ribs may be formed in the longitudinal direction and the circumferential direction. In this configuration, the reinforcing rib 1
The cost can be reduced as compared with a case where 7 is separately manufactured and fixed to the outer wall of the invert gutter 2. In addition, the bond strength with the foundation concrete also increases.

FIGS. 11 and 12 show a seventh embodiment. In this embodiment, the invert gutter 2 is integrally formed with resin at the upper portion of the outer surface thereof, the edge preventing fins 5 and 5 embedded or fixed in the concrete base 11 or on the surface of the concrete base 11. It is desirable to form holes 51 or notches 52 in the edge preventing fins 5, 5 in order to increase the bonding strength with concrete.

In this embodiment, the edge preventing fins 5 are provided on both sides of the invert gutter 2 in the longitudinal direction. However, even if intermittent, only one side of the invert gutter 2 is formed. It may be. The edge prevention fins 5 and 5 have a different coefficient of thermal expansion from concrete,
The edge of the resin invert gutter 2 having low adhesiveness has an effect of preventing the concrete base 11 from peeling off the concrete.

[Brief description of the drawings]

FIG. 1 is a front view of an invert joint according to a first embodiment.

FIG. 2 is a cross-sectional view of the invert joint of the first embodiment.

FIG. 3 is a plan view of the invert joint of the first embodiment.

FIG. 4 is an enlarged view of a connection portion.

FIG. 5 is a plan view of an invert joint according to a second embodiment.

FIG. 6 is a plan view of an invert joint according to a third embodiment.

FIG. 7 is a plan view of an invert joint according to a fourth embodiment.

FIG. 8 is an enlarged view of a main part of an invert joint according to a fifth embodiment.

FIG. 9 is an enlarged view of a main part of an invert joint according to a sixth embodiment.

FIG. 10 is an enlarged view of a main part of an invert joint according to a sixth embodiment.

FIG. 11 is an enlarged plan view of a main part of an invert joint according to a seventh embodiment.

FIG. 12 is an enlarged sectional view of a main part of an invert joint according to a seventh embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Invert joint 2 Invert gutter 2A Inlet gutter 2B Intermediate gutter 2C Outlet gutter 3 Pillar 4 Support rod 5 Edge prevention fin 12 Sewage inflow 13 Sewage outflow 14 Bracket (hook) 15 Reinforcement rod (Reinforcement rib) 21 Flange 22 Flange 24 Bolt M Manhole

Claims (10)

[Claims] 1. An invert flow path installed on an upper surface of a foundation concrete cast at the bottom of a manhole for smoothly connecting an inlet and an outlet of sewage opened to an inner peripheral wall of the manhole. An invert fitting, comprising: an invert gutter made of resin, concrete, or porcelain that is fitted between the inflow port and the outflow port to form an invert flow path; and the invert gutter provided on an outer surface of the invert gutter. An invert joint comprising a reinforcing rib for preventing deformation of the invert joint. 2. The invert joint according to claim 1, wherein the reinforcing ribs are rigid reinforcing rods arranged and fixed in a longitudinal direction on an outer surface of the invert gutter. . 3. The invert joint according to claim 1, wherein the reinforcing rib is a rigid reinforcing rod that is circumferentially arranged and fixed to an outer surface of the invert gutter. . 4. The invert joint according to claim 1, wherein the reinforcing rib is a longitudinal ridge integrally formed on an outer surface of the invert gutter. 5. The invert joint according to claim 1, wherein the reinforcing rib is a circumferential ridge integrally formed on an outer surface of the invert gutter. 6. The invert joint according to claim 1, wherein the invert gutter is formed to be slightly shorter than a length of the invert flow path between the inlet and the outlet. A flange formed at the end of the invert gutter and a screw screwed to the flange are provided, and when the screw is turned, the tip of each screw comes into contact with the inner wall surface of the manhole around the inlet or outlet. An invert joint, wherein the invert gutter is fixed to an inner wall surface of the manhole. 7. The invert joint according to claim 6, wherein the invert gutter is curved in one direction, and a support bar having a length adjusting screw is attached to an outer wall of the curved portion, and the support bar is attached to the invert gutter. When the length adjusting screw is twisted while being disposed in a substantially Y-shape with respect to the invert gutter, the tip of the support rod comes into pressure contact with the inner wall surface of the manhole at an intermediate position between the inflow port and the outflow port, thereby causing the invert. An invert joint, wherein a gutter is fixed to an inner wall surface of the manhole. 8. The invert joint according to claim 2, wherein the reinforcing rod is made of heavy metal such as iron and has high strength, and is fitted into a hook provided outside the invert gutter. An invert joint characterized by being fixed. 9. The invert joint according to claim 1, wherein the invert gutter has an inlet gutter and an outlet gutter having the flange, and a gap between the inlet gutter and the outlet gutter. An invert joint, which is divided into one or more intermediate gutters that communicate with each other, and each gutter is bonded at a connection portion having a bonding margin. 10. The invert joint according to claim 1, wherein the invert gutter has an edge preventing fin embedded or fixed in the foundation concrete or on the surface of the foundation concrete on an outer surface. Features invert joints.