JP2023020438A - Inner sub pipe joint - Google Patents

Abstract

To provide an inner sub pipe joint capable of ensuring more work space inside a manhole.SOLUTION: An inner sub-pipe joint 1 has a cylindrical vertical tube 11 extending in the vertical direction on the front side. Since the upper part of the vertical tube 11 is formed with a width dimension to be longer than the depth dimension, sufficient volume is secured in vertical tube 11 for draining water flowing in the drain pipe 3. Also, since the bottom width dimension of vertical tube 11 is formed to get to be gradually narrower toward the lower drainage outlet 13a, the short drainage outlet 13a is formed in both the width direction and the depth direction. With this, a pipe with a diameter smaller than vertical tube 11 can be installed at a position closer to the inner wall of manhole 2, and accordingly, a more wider workspace can be ensured in the manhole 2.SELECTED DRAWING: Figure 5

Description

The present invention relates to an inner sub-pipe joint installed in a manhole.

2. Description of the Related Art Conventionally, in a manhole into which wastewater flows, an inner secondary pipe is sometimes installed on the inner wall of the manhole when the drop of the wastewater from the inflow pipe on the inflow side to the bottom of the manhole is large. The inner secondary pipe consists of an inner secondary pipe joint that changes the flow direction of wastewater downward, and a secondary pipe that is connected to this inner secondary pipe joint and guides the wastewater downward, and discharges wastewater from near the bottom of the manhole. There is a manhole that prevents scattering of waste water flowing into the manhole, erosion of the bottom of the manhole, noise, and the like (see, for example, Patent Document 1).

JP-A-2005-30162

Since the inner secondary pipe as described in Patent Document 1 is installed so as to protrude inside the manhole, the working space inside the manhole is narrowed. On the other hand, the inflow of wastewater flowing from the inflow pipe to the inner secondary pipe may temporarily increase, but this situation does not continue. If the secondary pipe has a smaller diameter than the inflow pipe, the water can be discharged sufficiently. Therefore, by making the diameter of the secondary pipe smaller than that of the inflow pipe, it is possible to secure a working space in the manhole.

However, with the inner secondary pipe joint having a circular cross-sectional shape as in Patent Document 1, the pipe diameter of the secondary pipe connected to the outflow port of the inner secondary pipe joint is adjusted in consideration of the amount of drainage flowing from the inflow pipe. If the diameter of the secondary pipe is also reduced, the work space inside the manhole can be secured by reducing the diameter of the secondary pipe, but the space between the secondary pipe and the inner wall of the manhole is wasted, and the secondary pipe becomes small in diameter. The resulting space cannot be fully utilized.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inner sub-pipe joint capable of securing more working space in a manhole.

In order to solve the above problems, the inner sub pipe joint according to claim 1 of the present invention is
An inner sub-pipe joint installed on the inner wall of a manhole,
an inflow port into which waste water from the inflow pipe flows;
a vertical pipe portion for causing the wastewater flowing in from the inlet to flow out from a lower outlet;
with
The upper portion of the vertical pipe portion is formed such that the width dimension along the circumferential direction of the inner wall of the manhole is longer than the depth dimension extending inside the inner wall of the manhole,
The width dimension of the lower portion of the vertical pipe portion is formed to gradually narrow toward the outlet port.
According to this feature, the upper portion of the vertical pipe portion is formed so that the width dimension along the circumferential direction of the inner wall of the manhole is longer than the depth dimension extending inside the manhole, so that the vertical dimension into which the wastewater flows from the inflow pipe is increased. The width of the lower portion of the vertical pipe is gradually narrowed toward the lower outlet, resulting in a short outlet in both width and depth directions. is formed, a pipe having a diameter smaller than that of the vertical pipe portion can be installed at a position closer to the inner wall of the manhole, and a greater work space can be secured in the manhole.

The inner secondary pipe joint according to claim 2 of the present invention is the inner secondary pipe joint according to claim 1,
An inspection opening is formed in the vertical pipe portion at a position facing the inflow port,
The inspection port is characterized by being larger than the inner diameter of the inflow pipe.
According to this feature, since the inspection opening is larger than the inner diameter of the inflow pipe, a wide view of the inside of the inflow pipe can be obtained from the inspection opening.

The inner secondary pipe joint according to claim 3 of the present invention is the inner secondary pipe joint according to claim 1 or 2,
A mounting portion for mounting the vertical pipe portion to the inner wall of the manhole,
A spacer corresponding to the shape of the inner wall of the manhole can be attached to the attachment portion.
According to this feature, by attaching the spacer corresponding to the inner wall shape of the manhole to the mounting portion, it is possible to install the common inner sub-pipe joint in manholes having different inner wall shapes.

1 is a broken perspective view of a manhole in which an inner sub-pipe joint of an embodiment to which the present invention is applied is installed; FIG. It is an external appearance perspective view of the inner sub-pipe joint of a present Example. Fig. 3 is an exploded perspective view of the inner secondary pipe joint of the present embodiment; (a) to (e) are a front view, a side view, a top view, a rear view and a bottom view of the joint body, respectively. FIG. 4B is a cross-sectional view taken along the line AA of FIG. 4B; (a) is a partially broken perspective view of the joint body, and (b) is a cross-sectional view taken along the line BB of FIG. 4(d). (a) to (f) are a front view, a side view, a CC sectional view, a top view, a rear view and a bottom view of the spacer, respectively. (a) to (d) are top views of the inner sub-pipe joint installed on the inner wall of the manhole. (a) and (b) are diagrams showing how the inner sub-pipe joint is attached to the drain pipe connected by the flexible joint attached to the inner wall of the manhole. It is a figure which shows the attachment situation of the inner sub-pipe joint with respect to the drainage pipe connected by the flexible joint attached to the outer wall of a manhole. (a) and (b) are sectional views showing a state in which the inner sub-pipe joint is installed in a manhole. (a) to (c) are diagrams showing an inner sub pipe joint in Modification 1. FIG. (a) and (b) are diagrams showing an inner secondary pipe joint in Modification 2. FIG. (a) to (c) are diagrams showing an inner sub pipe joint in Modification 3. FIG. (a) and (b) are diagrams showing an inner secondary pipe joint in Modification 4. FIG. (a) is a diagram showing a recessed cutout, and (b) is a diagram showing a modified example of the recessed cutout. (a) to (c) are diagrams showing modifications of the spacer.

[Mode 1]
2. Description of the Related Art Conventionally, in a manhole into which wastewater flows, an inner secondary pipe is sometimes installed on the inner wall of the manhole when the drop of the wastewater from the inflow pipe on the inflow side to the bottom of the manhole is large. The inner secondary pipe consists of an inner secondary pipe joint that changes the flow direction of wastewater downward, and a secondary pipe that is connected to this inner secondary pipe joint and guides the wastewater downward, and discharges wastewater from near the bottom of the manhole. There is a manhole that prevents scattering of wastewater flowing into the manhole, erosion of the bottom of the manhole, and noise (for example, Japanese Patent Application Laid-Open No. 2005-30162).

Since such an inner secondary pipe is installed so as to protrude inside the manhole, the work space inside the manhole is narrowed. On the other hand, the inflow of wastewater flowing from the inflow pipe to the inner secondary pipe may temporarily increase, but this situation does not continue. If the secondary pipe has a smaller diameter than the inflow pipe, the water can be discharged sufficiently. Therefore, by making the diameter of the secondary pipe smaller than that of the inflow pipe, it is possible to secure a working space in the manhole.

However, in the inner secondary pipe joint having a circular cross-sectional shape as disclosed in Japanese Patent Application Laid-Open No. 2005-30162, the secondary pipe connected to the outflow port of the inner secondary pipe joint is considered while considering the amount of drainage flowing in from the inflow pipe. If the diameter is reduced to match the diameter of the manhole, the work space inside the manhole can be secured because the diameter of the Fukukan is small, but the space between the sub pipe and the inner wall of the manhole is wasted. The space created by the small diameter cannot be fully utilized.

On the other hand, the inner secondary pipe joint of form 1 is
An inner sub-pipe joint installed on the inner wall of a manhole,
an inflow port into which waste water from the inflow pipe flows;
a vertical pipe portion for causing the wastewater flowing in from the inlet to flow out from a lower outlet;
with
The upper portion of the vertical pipe portion is formed such that the width dimension along the circumferential direction of the inner wall of the manhole is longer than the depth dimension extending inside the inner wall of the manhole,
The width dimension of the lower portion of the vertical pipe portion is formed to gradually narrow toward the outlet port.
According to this feature, the upper portion of the vertical pipe portion is formed so that the width dimension along the circumferential direction of the inner wall of the manhole is longer than the depth dimension extending inside the manhole, so that the vertical dimension through which the wastewater flows from the inflow pipe. The width of the lower portion of the vertical pipe portion is gradually narrowed toward the lower outlet port, resulting in a short outlet port in both width and depth directions. is formed, a pipe having a diameter smaller than that of the vertical pipe portion can be installed at a position closer to the inner wall of the manhole, and a greater work space can be secured in the manhole.

[Mode 2]
The inner secondary pipe joint of form 2 is the inner secondary pipe joint according to form 1,
The lower portion of the vertical pipe portion is characterized in that the depth dimension does not change toward the outlet port. According to this feature, the width dimension of the lower portion of the vertical pipe portion gradually narrows toward the outlet port. While formed, the depth dimension does not change toward the outflow port, so the shape of the lower portion of the vertical tube portion does not become complicated.

[Form 3]
The inner secondary pipe joint of form 3 is the inner secondary pipe joint according to form 1 or 2,
The lower portion of the vertical tube portion gradually increases in width from a substantially elliptical cross-section whose width dimension is greater than the depth dimension toward an outflow port having a substantially circular cross-section whose width dimension and depth dimension are substantially the same. According to this feature, the width dimension of the lower portion of the vertical pipe gradually narrows from the approximately elliptical cross section toward the approximately circular cross section of the outflow port. The flow of drainage becomes smooth.

[Mode 4]
The inner secondary pipe joint of form 4 is the inner secondary pipe joint according to any one of forms 1 to 3,
The lower portion of the vertical pipe portion is characterized in that the width dimension is gradually narrowed from a position below the lowermost end of the inflow port toward the outflow port.
According to this feature, the width dimension of the lower portion of the vertical pipe portion is formed to gradually narrow from a position below the lowest end of the inflow port toward the outflow port, and the volume in the vertical direction of the vertical pipe portion is also sufficiently secured. Therefore, even if the amount of waste water flowing into the inflow port temporarily increases, it can be discharged to the outflow port with a margin.

[Mode 5]
The inner secondary pipe joint of form 5 is the inner secondary pipe joint according to any one of forms 1 to 4,
An upper inspection opening is formed on the upper surface of the vertical pipe portion,
The upper inspection opening is characterized in that the width dimension is longer than the depth dimension.
According to this feature, the width dimension of the upper inspection opening is longer than the depth dimension, as is the case with the upper part of the vertical pipe part. .

[Mode 6]
The internal secondary pipe joint of form 6 is the internal secondary pipe joint according to any one of forms 1 to 5,
The vertical tube portion is
a first vertical pipe portion forming an upper portion of the vertical pipe portion;
a second vertical pipe portion forming a lower portion of the vertical pipe portion and connected to a lower portion of the first vertical pipe portion;
It is characterized by having
According to this feature, it is also possible to connect the second vertical pipe portion below the first vertical pipe portion and connect the second vertical pipe portion to a pipe shorter than the width dimension of the first vertical pipe portion. Instead, a pipe having the same width as the first vertical pipe portion may be connected below the first vertical pipe portion.

[Mode 7]
2. Description of the Related Art Conventionally, in a manhole into which wastewater flows, an inner secondary pipe is sometimes installed on the inner wall of the manhole when the drop of the wastewater from the inflow pipe on the inflow side to the bottom of the manhole is large. The inner secondary pipe consists of an inner secondary pipe joint that changes the flow direction of wastewater downward, and a secondary pipe that is connected to this inner secondary pipe joint and guides the wastewater downward, and discharges wastewater from near the bottom of the manhole. There is a manhole that prevents scattering of wastewater flowing into the manhole, erosion of the bottom of the manhole, and noise (for example, Japanese Patent Application Laid-Open No. 2005-30162).

The inner secondary pipe joint that constitutes such an inner secondary pipe is bent in an L-shape when viewed from the side, and changes the direction of the wastewater flowing in from the side downward to flow down. Drainage may stagnant, and there is a risk that foreign matters and conveyed materials contained in the stagnant drainage may affect the drainage performance.

On the other hand, the inner secondary pipe joint of form 7 is
An inner sub-pipe joint installed on the inner wall of a manhole,
an inflow port into which waste water from the inflow pipe flows;
a vertical pipe portion for causing the wastewater flowing in from the inlet to flow out from a lower outlet;
an extension pipe portion extending from the vertical pipe portion to the inlet;
with
A recess extending into the vertical pipe portion is formed on the inner peripheral bottom surface of the extension pipe portion.
According to this feature, since the recessed portion extending into the vertical pipe portion is formed on the inner peripheral bottom surface of the extension pipe portion extending from the vertical pipe portion to the inflow port, the drainage that has flowed into the extension pipe portion is recessed. Since waste water can be prevented from accumulating in the extension pipe portion by flowing out to the vertical pipe portion through the portion, it is possible to suppress the influence of contaminants and conveyed items contained in the accumulated waste water on the drainage performance.

[Mode 8]
The inner secondary pipe joint of form 8 is the inner secondary pipe joint according to form 7,
A bottom surface of the concave cut portion is characterized in that the inclination gradually increases from the extension pipe portion toward the inside of the vertical pipe portion.
According to this feature, the drainage that has flowed into the recess can be discharged smoothly.

[Mode 9]
The inner secondary pipe joint of form 9 is the inner secondary pipe joint according to any one of forms 1 to 8,
An inspection opening is formed in the vertical pipe portion at a position facing the inflow port,
The inspection port is characterized by being larger than the inner diameter of the inflow pipe.
According to this feature, since the inspection opening is larger than the inner diameter of the inflow pipe, a wide view of the inside of the inflow pipe can be obtained from the inspection opening.

[Mode 10]
The inner secondary pipe joint of form 10 is the inner secondary pipe joint according to any one of forms 1 to 9,
It is characterized by comprising a grasping part capable of grasping the inner secondary pipe joint.
According to this feature, by gripping the gripping portion of the inner secondary pipe joint, the inner secondary pipe joint can be placed in the manhole in a stable state.

[Mode 11]
The inner secondary pipe joint of mode 11 is the inner secondary pipe joint according to any one of modes 1 to 10,
The outflow port is formed with a socket provided with a retaining mechanism for the tube inserted from below.
This feature allows easy connection of the pipe to the outlet.

[Form 12]
The inner secondary pipe joint of form 12 is the inner secondary pipe joint according to any one of forms 1 to 11,
A mounting portion for mounting the vertical pipe portion to the inner wall of the manhole,
A mounting hole through which the mounting member can be inserted and a temporary fixing hole for temporarily fixing to the inner wall of the manhole are formed in the mounting portion.
According to this feature, after positioning the inner sub-pipe joint by temporarily fixing it using the temporary fixing hole, the attaching portion can be attached to the inner wall of the manhole by the attaching member.

[Mode 13]
The inner secondary pipe joint of mode 13 is the inner secondary pipe joint according to any one of modes 1 to 12,
A mounting portion for mounting the vertical pipe portion to the inner wall of the manhole,
The mounting portion is characterized in that an index portion indicating a center position of the inlet is formed.
According to this feature, it is possible to perform work while confirming the central position of the inflow port, which is not visible from the operator side, when installing on the inner wall of the manhole.

[Mode 14]
The inner secondary pipe joint of mode 14 is the inner secondary pipe joint according to any one of modes 1 to 13,
A mounting portion for mounting the vertical pipe portion to the inner wall of the manhole,
A spacer corresponding to the shape of the inner wall of the manhole can be attached to the attachment portion.
According to this feature, by attaching the spacer corresponding to the inner wall shape of the manhole to the mounting portion, it is possible to install the common inner sub-pipe joint in manholes having different inner wall shapes.

[Mode 15]
The inner secondary pipe joint of form 15 is the inner secondary pipe joint according to form 14,
The spacer includes a locking portion that locks the mounting portion,
The mounting portion of the spacer is locked by the locking portion, and the spacer can be installed on the inner wall of the manhole in a state of being integrated with the mounting portion.
According to this feature, the inner sub pipe joint can be installed efficiently because it can be installed on the inner wall of the manhole in a state in which the spacer and the mounting portion are integrated.

[Mode 16]
The internal secondary pipe joint of form 16 is the internal secondary pipe joint according to form 14 or 15,
The spacer is characterized by being divisible.
According to this feature, even if the entrance of the manhole is narrow, it can be easily brought inside by dividing the spacer.

[Mode 17]
The internal secondary pipe joint of form 17 is the internal secondary pipe joint according to any one of forms 14 to 16,
The spacer is characterized by being made of a flexible material.
According to this feature, even if the entrance of the manhole is narrow, it can be easily brought inside by bending the spacer.

[Mode 18]
The internal secondary pipe joint of form 18 is the internal secondary pipe joint according to any one of forms 14 to 17,
A temporary fixing hole for temporarily fixing to the inner wall of the manhole is formed in the mounting portion,
A temporary fixing hole is formed in the spacer at a position corresponding to the temporary fixing hole of the mounting portion.
According to this feature, even when the inner secondary pipe joint is attached via the spacer, the inner secondary pipe joint can be temporarily fixed using the temporary fixing hole.

[Mode 19]
The internal secondary pipe joint of form 19 is the internal secondary pipe joint according to any one of forms 14 to 18,
An annular first recess and an annular second recess located outside the first recess are formed on the surface of the spacer that is installed on the inner wall of the manhole,
A soft material is arranged in one of the first recess and the second recess when installing on the inner wall of the manhole.
According to this feature, one recess is sealed by arranging a soft material, and the spacer can be made lighter by providing the recess not used for sealing.

[Form 20]
The inner secondary pipe joint of form 20 is the inner secondary pipe joint according to any one of forms 14 to 19,
The spacer is characterized by forming a fitting portion into which a part of a flexible joint for connecting the inflow pipe to the inner wall of the manhole can be fitted.
According to this feature, by fitting a part of the flexible joint into the fitting portion of the spacer, the spacer can be installed in a state in which the thickness of the flexible joint is released into the fitting portion.

EMBODIMENT OF THE INVENTION Below, embodiment of the inner sub-pipe joint which concerns on this invention is described below based on an Example.

FIG. 1 is a broken perspective view of a manhole in which the inner sub-pipe joint of this embodiment is installed. As shown in FIG. 1, the inner sub-pipe joint 1 of this embodiment is installed in a manhole 2 buried under the ground surface as a sewage relay facility, and is connected to the upper side of the manhole 2. It is formed at the bottom of the manhole 2 via a straight pipe 4 and/or a curved pipe 5 connected to the lower side of the inner sub pipe joint 1, and is formed at the bottom of the manhole 2. By guiding the water to the invert portion 9, it is possible to prevent the scattering and erosion of waste water, noise, and the like. The inner sub pipe joint 1 and the straight pipe 4 and/or the bent pipe 5 constitute an inner sub pipe.

[About manholes]
The manhole 2 is a frame made of concrete, and as shown in FIG. 1, a thin cylindrical main body is vertically buried in the ground. The upper portion of the main body of the manhole 2 is formed in a conical shape (not shown) whose diameter decreases upward, and an opening 6 is provided at the upper end portion. A disk-shaped lid 7 is detachably attached to the opening 6 so that the opening 6 can be opened and closed. ing. The inner bottom of the manhole 2 is formed with an inverted portion 9 having a substantially semicircular cross-section that slopes toward a drain pipe 8 connected to the side of the lower portion of the manhole 2 .

[Regarding inner sub pipe fittings]
FIG. 2 is an external perspective view of the inner sub-pipe joint of this embodiment, and FIG. 3 is an exploded perspective view of the inner sub-pipe joint of this embodiment. As shown in FIGS. 2 and 3 , the inner secondary pipe joint 1 is composed of a joint body 10 and a spacer 30 .

[About the joint body]
4(a) to (e) are a front view, a side view, a top view, a rear view, and a bottom view of the joint body 10, respectively, and FIG. 5 is a sectional view taken along line AA in FIG. 4(b). 6(a) is a partially broken perspective view of the joint body, and FIG. 6(b) is a cross-sectional view taken along line BB of FIG. 4(d).

The joint main body 10 is integrally formed of synthetic resin such as vinyl chloride. One end side of the joint body 10 (hereinafter, the side facing the center of the manhole 2 when the inner sub-pipe joint 1 is installed in the manhole 2 is defined as one end side, and when the inner sub-pipe joint 1 is installed in the manhole 2, the manhole 2 2 to 6, a cylindrical vertical tube portion 11 extending in the vertical direction is formed on the side facing the outer wall of the tube. The upper portion 11a (see FIGS. 4 and 6) of the vertical pipe portion 11 has a width dimension (a dimension along the circumferential direction of the inner wall of the manhole 2) larger than a depth dimension (a dimension extending toward the inner diameter side of the manhole 2), and It is formed in a substantially elliptical cross-section whose width dimension and depth dimension do not change over its lower end, and its upper end is opened to form an upper inspection opening 12 . Moreover, the width dimension of the upper portion 11 a of the vertical pipe portion 11 is larger than the outer diameter of the drain pipe 3 , and the depth dimension is smaller than the outer diameter of the drain pipe 3 . The shape of the upper inspection opening 12 is the same as the cross-sectional shape of the upper portion 11a of the vertical tube portion 11, and is substantially elliptical with a width dimension larger than a depth dimension.

As shown in FIGS. 2 to 6, the lower portion 11b (see FIGS. 4 and 6) of the vertical tube portion 11 has the same cross-sectional shape as the upper portion 11a of the vertical tube portion 11, that is, the width dimension is larger than the depth dimension. It is formed in a tapered shape in which the width dimension gradually narrows downward from a position below the lower end portion 19U of the drainage inlet 19, which will be described later, while the depth dimension is the same. The width dimension and the depth dimension of the lower end of the lower portion 11b of the vertical pipe portion 11 are reduced to a circular cross-sectional shape smaller than the outer diameter of the drain pipe 3 without changing downward.

Below the vertical pipe portion 11, as shown in FIGS. 2 to 6, a secondary pipe connection portion 13 is formed continuously with the lower portion 11b of the vertical pipe portion 11. As shown in FIGS. As shown in FIGS. 5 and 6(b), the secondary pipe connecting portion 13 has a drainage outlet 13a having approximately the same outer diameter as the insertion port of the straight pipe 4 or the curved pipe 5 at its lower end. An annular groove portion 13c is formed on the inner surface of the pipe connection portion 13, in which a water stop ring 13b made of a soft material such as rubber is fitted. The water stop ring 13b is formed with an annular ridge 13d that protrudes upward and inward. is suppressed. Further, the secondary pipe connection portion 13 is formed with an enlarged diameter portion 13e that expands in diameter upward from the groove portion 13c, that is, expands in a tapered shape in a direction opposite to the opening of the secondary pipe connection portion 13 (the drainage outlet 13a). Therefore, even after the spigot of the straight tube 4 or the curved tube 5 is inserted into the secondary tube connection portion 13, the insertion angle of the straight tube 4 or the curved tube 5 can be adjusted within the range of the inner diameter of the enlarged diameter portion 13e.

As shown in FIG. 3 , the joint body 10 is formed with an inspection opening 14 that opens at one end of the vertical pipe portion 11 and extends toward the one end. The mouth 14a is opened. The inner diameter of the inspection port 14a is larger than the inner diameter of the drain pipe 3 connected to the inner sub pipe joint 1, as shown in FIG. 9(b). The inspection port 14 a can be closed by an inspection port cover 15 .

The inspection port cover 15 is molded from a synthetic resin such as vinyl chloride, and as shown in FIG. A protruding portion 15b is formed to fit into the portion 14 to close the inspection port 14a, and an annular recessed portion (not shown) is formed around the protruding portion 15b. 15c is attached.

As shown in FIGS. 2 and 3, the inspection hatch cover 15 is formed with locking grooves 15d in the vertical direction. Locking portions 16, 16 having locking holes 16a extending therethrough are formed. With the inspection port cover 15 closing the inspection port 14a, a locking pin 17 is inserted into the locking holes of the locking portions 16, 16 from above. By inserting the inspection port 16a, the opening of the inspection port lid 15 is restricted by the locking pin 17 locked in the locking groove 15d.

As shown in FIGS. 2 to 4 and 6, the joint main body 10 has an opening on the other end side of the vertical pipe portion 11, extends toward the other end side, and has an inner side of a mounting portion 21, which will be described later. A short pipe-shaped extension pipe portion 18 having a drain inlet 19 is formed at the end. The inner peripheral surface of the extended pipe portion 18 is slightly expanded in diameter from the vertical pipe portion 11 on the one end side toward the drainage inlet 19 on the other end side over the entire circumference. 5 and 6 (a) (b) in the inner peripheral bottom surface of the extended pipe portion 18, that is, in a part of the region near the center of the lower half or less of the inner peripheral surface of the extended pipe portion 18. ), a recess 20 is formed so as to extend obliquely downward toward the inner peripheral surface 11c of the vertical pipe portion 11. As shown in FIG. As shown in FIG. 6(b), the bottom surface of the recess 20 has a substantially arc shape in which the inclination angle θ of the bottom surface becomes gradually steeper from the extended pipe portion 18 toward the inner peripheral surface 11c of the vertical pipe portion 11. is formed in

At the other end of the joint main body 10, as shown in FIGS. 2 to 6, a substantially rectangular mounting portion 21 having an opening for the drainage inlet 19 is formed inside. As shown in FIGS. 4(c) and 4(e), the mounting portion 21 is formed with a curved mounting surface 21a having a curvature along the inner peripheral surface of the No. 1 manhole a2 (see FIG. 8(a)). ing. In addition, through-holes 22 for mounting members such as fixing bolts B are formed at the four corners of the mounting portion 21 so as to pass through in the front-rear direction. The insertion hole 22 has an elongated hole shape extending from the center of the attachment portion 21 toward the four corners of the outer edge. A temporary fixing portion 23 projecting upward is formed on the upper side of the mounting portion 21, and a temporary fixing hole 23a is formed through the temporary fixing portion 23 in the front-rear direction. In addition, as shown in FIG. 5, indicator convex portions 24a, 24a are formed at the left and right ends of the mounting portion 21 at positions where the center line C1 in the lateral direction of the drainage inlet 19 passes. An index projection 24b is formed on the upper end at a position through which the vertical center line C2 of the drainage inlet 19 passes.

As shown in FIGS. 4(a), 6(a) and 6(b), the mounting surface 21a of the mounting portion 21 is formed with a notch portion 21b which is annularly cut around the drainage inlet 19. ing. The notch portion 21b has an inner diameter that allows a flange portion 40b of a flexible joint 40, which will be described later, to be fitted to connect the drain pipe 3 to the manhole 2. As shown in FIG. The mounting surface 21a has an annular groove 21c formed outside the notch 21b, and an annular groove 21d formed outside the groove 21c. An annular waterproof packing P (see FIG. 9B) is attached to the groove 21d. In addition, when attaching to the manhole 2 using the spacer 30, the waterproof packing P is not attached. The groove portion 21c is intended to reduce the weight of the joint body 10 and the amount of material used. Further, the portions defining the grooves 21c and 21d function as ribs to increase the structural strength of the mounting portion 21 and stabilize its shape.

On both sides of the joint body 10, as shown in FIGS. 2 to 4, gripping portions 25, 25 are formed extending obliquely upward from the mounting portion 21 to the side surface of the vertical pipe portion 11 toward one end side. It is possible to grip the joint body 10 from both sides.

[Regarding the spacer]
7(a) to (f) are a front view, a side view, a CC cross-sectional view, a top view, a rear view and a bottom view of the spacer 30, respectively, and FIGS. 8(a) to (d). ) is a top view of the inner sub-pipe joint 1 installed on the inner wall of the manhole 2. FIG.

The spacer 30 is integrally molded with a synthetic resin such as vinyl chloride. As shown in FIGS. 7A and 7E, the spacer 30 has an outer peripheral shape that is substantially the same as the outer peripheral shape of the mounting portion 21 of the joint body 10. A drainage inlet 31 having the same diameter is formed. Further, the spacer 30 has insertion holes 32 formed at positions corresponding to the insertion holes 22 formed in the mounting portion 21 of the joint body 10, respectively, and temporary fixing holes 33 at positions corresponding to the temporary fixing holes 23a. is formed.

As shown in FIGS. 2 and 3, the outer peripheral shape of the spacer 30 is slightly larger in diameter than the outer peripheral shape of the mounting portion 21, and the non-mounting surface 30a of the spacer 30 protrudes toward the joint main body 10 from the outer edge. An annular receiving portion 34 is formed, and when the joint body 10 is attached to the spacer 30 , the attachment portion 21 of the joint body 10 fits inside the receiving portion 34 .

As shown in FIGS. 2, 3 and 7, the spacer 30 has two pairs of engaging claws 35a protruding inwardly at its tips and elastically deformable outward. Stopping pieces 35, 35 are formed toward the joint main body 10 side, and as shown in FIG. When the deformation of the stop piece 35 returns, both sides of the mounting portion 21 of the joint body 10 are locked by the locking claws 35a, and the joint body 10 and the spacer 30 are assembled integrally.

As shown in FIGS. 7(d) and (f), the non-mounting surface 30a of the spacer 30 has a curved surface shape with a curvature along the mounting surface 21a of the mounting portion 21. Around the inlet 31, as shown in FIGS. 7(a) and 7(c), annular grooves protruding toward the joint body 10 are provided at positions corresponding to the notch 21b, the groove 21c, and the groove 21d formed in the mounting surface 21a. When the joint body 10 is attached to the spacer 30, the protrusions 36a, 36b are formed in the notch 21b, the groove 21c, and the groove 21d formed in the mounting surface 21a. , 36c are respectively fitted.

As shown in FIGS. 8B to 8D, the mounting surface 30b of the spacer 30 has a curved surface shape or a planar shape with a curvature along the inner peripheral surfaces of the manholes 2b to 2d other than the No. 1 manhole 2a. As the spacer 30, the shape of the mounting surface 30b is along the inner peripheral surface of the manhole 2b (for example, the No. 0 manhole) whose inner wall curvature is larger than that of the No. 1 manhole 2a, as shown in FIG. 8(b). A curved surface shape, as shown in FIG. 8C, a curved surface shape along the inner peripheral surface of a manhole 2c (for example, No. 2 and 3 manholes) whose inner wall curvature is smaller than that of the No. 1 manhole 2a As shown in FIG. 8(d), there is a manhole having a flat inner wall along the inner peripheral surface of the manhole 2d. It is possible to attach the inner sub pipe joint 1 to manholes having different shapes. In addition, since the mounting surface 21a of the mounting portion 21 has a curved surface shape along the inner peripheral surface of the No. 1 manhole 2a, when mounting to the No. 1 manhole 2a, as shown in FIG. The joint main body 10 can be attached directly without using the .

As shown in FIGS. 7(a) and 7(c), the attachment surface 30b of the spacer 30 is formed with an annular notch 37a around the drainage inlet 31. As shown in FIGS. The notch portion 37a has an inner diameter that allows a flange portion 40b of a flexible joint 40, which will be described later, to be fitted to connect the drain pipe 3 to the manhole 2. As shown in FIG. Further, in the attachment surface 30b of the spacer 30, an annular groove portion 37b is formed outside the notch portion 37a, and an annular groove portion 37c is formed outside the groove portion 37b. An annular waterproof packing P (see FIG. 9B) is attached to the groove 37c. The groove portion 37b is intended to reduce the weight of the spacer 30 and the amount of material used. Further, the portions defining the grooves 37b and 37c function as ribs to increase the structural strength of the spacer 30 and stabilize its shape.

[How the inner sub pipe joint is attached to the manhole]
Next, how the inner sub pipe joint 1 is attached to the manhole 2 will be described.

FIG. 9 shows how the inner sub-pipe joint 1 is attached to the drain pipe 3 connected by the flexible joint 40 attached to the inner wall of the manhole 2. As shown in FIG. The flexible joint 40 is formed of a soft material such as rubber, and as shown in FIGS. and an annular flange portion 40b extending outwardly from. The outer diameter of the flange portion 40b is substantially the same as the inner diameter of the cutout portion 21b formed in the mounting surface 21a of the mounting portion 21 of the joint body 10 and the cutout portion 37a formed in the mounting surface 30b of the spacer 30. When mounting 10 or spacer 30, it is possible to fit the outer periphery of flange portion 40b into notch portion 21b or notch portion 37a.

When attaching the inner sub-pipe joint 1 to the drain pipe 3 connected by the flexible joint 40 attached to the inner wall of the manhole 2, as shown in FIG. The tubular portion 40a of the flexible joint 40 is inserted from the inside of the manhole 2 into the drainage inflow hole 2h drilled in the manhole 2, and the flange portion 40b is fixed to the inner wall of the manhole 2 with an adhesive or the like. One end of the drain pipe 3 is press-fitted into the portion 40a so that the end faces the inside of the manhole 2. As shown in FIG.

Next, as shown in FIG. 9(b), the notch portion 37a of the spacer 30 integrated with the joint body 10 is fitted to the flange portion 40b, and the mounting surface 30b is brought into contact with the inner wall of the manhole 2. It is temporarily fixed to the inner wall of the manhole 2 by temporary fixing bolts KB inserted through the fixing holes 23 a and 33 . As a result, one end of the drain pipe 3 faces the drain inlets 19 and 31 . At this time, since the joint main body 10 is provided with the gripping portions 25 on both sides, even if the straight pipe 4 or the curved pipe 5 is attached to the joint main body 10 and has a corresponding weight, the gripping portions 25 can be grasped from both sides. Positioning can be performed relatively easily by gripping. Moreover, since the flange portion 40b is fitted in the notch portion 37a and the flange portion 40b is accommodated in the notch portion 37a, the mounting surface 30b contacts the inner wall of the manhole 2 even if the flange portion 40b is thick. It is possible to

In this state, after fixing the spacer 30 and the mounting portion 21 to the inner wall of the manhole 2 with mounting means such as bolts B inserted through the four insertion holes 22, 32, the outer periphery of the spacer 30 is caulked with a caulking material. , the inner secondary pipe joint 1 is attached to the inner wall of the manhole 2 . Since the insertion holes 22 and 32 are elongated holes extending radially from the center, even if the fixed position of the mounting means such as the bolt B is slightly deviated, the inner sub pipe joint 1 can be mounted at the optimum position by adjusting. is.

When attaching to the No. 1 manhole 2a, the notch 21b of the attachment portion 21 of the joint body 10 is fitted to the flange portion 40b without using the spacer 30, and the attachment surface 21a is brought into contact with the inner wall of the manhole 2. After that, it is temporarily fixed to the inner wall of the manhole 2 by temporary fixing bolts KB inserted through the temporary fixing holes 23a, and the mounting portion 21 is attached to the inner wall of the manhole 2a by mounting means such as bolts B inserted through the insertion holes 22 at four locations. should be fixed to

In the above description, the temporary fixing bolt KB is used to temporarily fix the inner wall of the manhole 2. However, when the flange portion 40b has a high fitting strength with respect to the notch portion 37a and the notch portion 21b, the temporary fixing bolt KB The temporary fixing may be performed only by fitting the flange portion 40b into the notch portion 37a or the notch portion 21b without using the .

FIG. 10 is a diagram showing how the inner sub-pipe joint 1 is attached to the drain pipe 3 connected by the flexible joint 50 attached to the outer wall of the manhole 2. As shown in FIG. The flexible joint 50 is made of a soft material such as rubber, and as shown in FIG. and a flange portion 50b.

When attaching the inner sub-pipe joint 1 to the drain pipe 3 connected by the flexible joint 50 attached to the outer wall of the manhole 2, as shown in FIG. The flange portion 50b of the flexible joint 50 is fixed to the outer wall of the manhole 2 with an adhesive or the like in accordance with the drilled drainage inflow hole 2h, and then one end of the drainage pipe 3 is press-fitted into the cylindrical portion 50a, One end faces the inside of the manhole 2.

Next, as shown in FIG. 10, the mounting surface 30b of the spacer 30 integrated with the joint body 10 is brought into contact with the inner wall of the manhole 2, and after alignment, temporary fixing bolts KB are inserted through the temporary fixing holes 23a and 33. It is temporarily fixed to the inner wall of the manhole 2 by As a result, one end of the drain pipe 3 faces the drain inlets 19 and 31 .

In this state, after fixing the spacer 30 and the mounting portion 21 to the inner wall of the manhole 2 with mounting means such as bolts B inserted through the four insertion holes 22, 32, the outer periphery of the spacer 30 is caulked with a caulking material. , the inner secondary pipe joint 1 is attached to the inner wall of the manhole 2 .

When attaching to the No. 1 manhole 2a, the spacer 30 is not used, and the mounting surface 21a of the mounting portion 21 of the joint body 10 is brought into contact with the inner wall of the manhole 2a, and the temporary fixing bolt is inserted through the temporary fixing hole 23a. (not shown) is temporarily fixed to the inner wall of the manhole 2a, and the mounting portion 21 is fixed to the inner wall of the manhole 2a by mounting means such as bolts B inserted through the insertion holes 22 at four locations.

As shown in FIG. 11( a ), when the position where the drain pipe 3 faces is higher than the bottom of the manhole 2 , both ends cut according to the height position of the drain pipe 3 are used as inserts. The insertion port on one end side of the straight pipe 4 is fitted and connected to the secondary pipe connection portion 13 of the inner secondary pipe joint 1, and the insertion port on the other end side has a socket 5a on one side and the other side. The drainage discharged from the lower part of the inner sub pipe joint 1 is inserted into the socket 5a of the bent pipe 5 having the spigot 5b and connected to the inverted portion 9 of the manhole 2 through the straight pipe 4 and the bent pipe 5. It should be made to discharge.

Further, as shown in FIG. 11(b), when the position facing the drain pipe 3 is lower than the bottom of the manhole 2, the spigot 5b of the bent pipe 5 is It is only necessary to fit and connect the connecting portion 13 and discharge the waste water discharged from below the inner sub pipe joint 1 to the inverted portion 9 of the manhole 2 through the bent pipe 5 .

At this time, by using a bent pipe 5 having a spigot at one end and a socket 5a at the other end, even when the bent pipe 5 is connected to the inner sub pipe joint 1 via the straight pipe 4, the inner sub pipe joint 1, a common bent pipe 5 can be used.

[About actions and effects]
In this embodiment, the inner sub-pipe joint 1 has a cylindrical vertical pipe portion 11 extending in the vertical direction at one end thereof, and the width dimension of the upper portion 11a of the vertical pipe portion 11 is longer than the depth dimension. , the volume in the vertical pipe portion 11 into which the wastewater flows from the drainpipe 3 is sufficiently secured, and the width dimension of the lower portion 11b of the vertical pipe portion 11 is set downward toward the wastewater outlet 13a. Since the waste water outlet 13a is formed to be short in both the width direction and the depth direction by gradually narrowing the width, a secondary pipe having a smaller diameter than the vertical pipe portion 11 (for example, the straight pipe 4, the curved pipe 5 etc.) can be installed at a position closer to the inner wall of the manhole 2, and a more work space in the manhole 2 can be secured.

In this embodiment, the upper portion 11a of the vertical tube portion 11 has a substantially elliptical cross-sectional shape in which the width dimension is larger than the depth dimension, and the width dimension and the depth dimension do not change from the upper end to the lower end. 11b is formed in a tapered shape in which the width dimension gradually narrows downward from a position below the lower end of the drainage inlet 19, while the depth dimension remains the same and does not change downward. , the width and depth of which are smaller than the outer diameter of the drain pipe 3, but at least the width of the upper portion 11a of the vertical pipe portion 11 is longer than the depth. If the width dimension of the lower portion 11b of the vertical pipe portion 11 is gradually narrowed toward the downward drainage outlet port 13a, the above effects can be obtained, and the upper portion 11a of the vertical pipe portion 11 is not necessarily provided. does not need to have a substantially elliptical cross section, and the lower portion 11b of the vertical tube portion 11 does not need to be reduced in diameter downward from a substantially elliptical cross section to a circular cross section. The cross section may have a shape other than a substantially elliptical shape, and the shape after diameter reduction may have a shape other than a substantially circular cross section. Also, the depth dimension of the lower portion 11b of the vertical tube portion 11 may be shaped such that the width gradually narrows downward. Further, the width of the lower portion 11b of the vertical pipe portion 11 may be gradually narrowed downward from a position above the lower end portion of the drainage inlet 19 . The width of the lower portion 11b of the vertical pipe portion 11 is gradually narrowed toward the drainage outlet 13a. It may be a shape that becomes flat, or a shape that becomes gentler toward the bottom.

In this embodiment, the width of the lower portion 11b of the vertical tube portion 11 is gradually narrowed toward the drainage outlet 13a, while the depth does not change toward the drainage outlet 13a. The shape of the lower portion 11b of the portion 11 does not become complicated.

In this embodiment, the width of the lower portion 11b of the vertical tube portion 11 gradually narrows from the substantially elliptical cross section toward the waste water outlet 13a having a substantially circular cross section, so that the waste water flows smoothly. .

Further, in this embodiment, the width dimension of the lower portion 11b of the vertical pipe portion 11 is gradually narrowed from a position below the lowest end of the waste water inlet 19 toward the waste water outlet 13a. Since a sufficient vertical volume of 11 can be secured, even if the amount of wastewater flowing into the wastewater inlet 19 temporarily increases, it can be discharged to the wastewater outlet 13a with a margin.

In this embodiment, an upper inspection opening 12 is formed in the upper surface of the vertical pipe portion 11, and the upper inspection opening 12 is formed to have a width dimension longer than a depth dimension like the upper portion 11a of the vertical pipe portion 11. Therefore, blind spots in the vertical pipe portion 11 from the upper inspection opening 12 can be eliminated as much as possible. In this embodiment, the shape of the upper inspection opening 12 is the same as the inner peripheral shape of the upper portion 11a of the vertical pipe portion 11, but it is not necessarily the same shape, and at least the same as the upper portion 11a of the vertical pipe portion 11. If the width dimension is longer than the depth dimension, the same effect as above can be obtained.

In this embodiment, the inner sub pipe joint 1 has a cylindrical vertical pipe portion 11 extending in the vertical direction on one end side thereof, and an extended pipe portion 18 extending from the vertical pipe portion 11 to the drainage inlet 19. Since the inner peripheral bottom surface of the extended pipe portion 18 is formed with a recessed portion 20 extending downward toward the inner peripheral surface 11c of the vertical pipe portion 11, By letting the inflowing wastewater flow out to the vertical pipe portion 11 through the recessed portion 20, it is possible to prevent the wastewater from staying in the extended pipe portion 18, so that the wastewater contained in the stagnant wastewater and the wastewater to be conveyed can be prevented. The impact on performance can be suppressed.

In particular, in this embodiment, in order to facilitate the removal of the molded product from the mold during injection molding, the inner peripheral surface of the extended pipe portion 18 extends from the vertical pipe portion 11 on the one end side to the other end side over the entire circumference. The diameter is slightly expanded toward the drainage inflow port 19 of the extension pipe portion 18, so that the structure is such that drainage tends to stay in the extension pipe portion 18. However, the vertical pipe portion 11 The inner peripheral bottom surface of the extended pipe portion 18 is slightly expanded in diameter toward the drainage inlet 19 by forming the recessed portion 20 that extends downward toward the inner peripheral surface 11 c of the extension pipe portion 18 . However, it is possible to prevent waste water from remaining in the extension pipe portion 18 .

In this embodiment, the inner peripheral surface of the extended pipe portion 18 has a shape that slightly expands in diameter from the vertical pipe portion 11 on the one end side toward the drainage inlet 19 on the other end side over the entire circumference. , the inner peripheral surface of the extended pipe portion 18 may have the same diameter from the vertical pipe portion 11 on the one end side toward the drainage inlet 19 on the other end side. The surface may have a shape that expands in diameter from the drainage inlet 19 on the other end side toward the vertical pipe portion 11 on the one end side.

Further, in this embodiment, since the bottom surface of the recessed portion 20 gradually increases in inclination angle from the extended pipe portion 18 toward the inner peripheral surface 11c of the vertical pipe portion 11, the waste water flowing into the recessed portion 20 is can be discharged smoothly.

Further, in this embodiment, the recessed portion 20 is formed in a part of the inner peripheral bottom surface of the extended pipe portion 18, that is, in a region below the lower half of the inner peripheral surface of the extended pipe portion 18, near the center. Since the wastewater easily gathers in the recess 20, the wastewater flowing into the recess 20 can be discharged smoothly even when the flow rate of the wastewater is small.

In this embodiment, the width dimension of the upper portion 11a of the vertical pipe portion 11 is formed longer than the depth dimension, and the width dimension of the lower portion 11b of the vertical pipe portion 11 gradually increases toward the drainage outlet 13a. Although it is narrowly formed, it has at least a cylindrical vertical pipe portion 11 extending in the vertical direction and an extended pipe portion 18 extending from the vertical pipe portion 11 to the drainage inlet 19. The above effect can be obtained if the recessed portion 20 is formed on the inner peripheral bottom surface of the pipe portion 18 and extends downward toward the inner peripheral surface 11c of the vertical pipe portion 11. The width dimension of the upper portion 11a of the pipe portion 11 need not be longer than the depth dimension, and the width dimension of the lower portion 11b of the vertical pipe portion 11 gradually narrows toward the drainage outlet 13a. does not need to be formed. For this reason, the vertical tube portion 11 may be formed in a cylindrical shape having a substantially circular cross section. Further, the lower portion 11b of the vertical tube portion 11 may be configured so that the diameter thereof is not reduced toward the drainage outlet 13a.

In this embodiment, an inspection opening 14a is formed at a position facing the waste water inlet 19 of the vertical pipe portion 11, and the inner diameter of the inspection opening 14a is larger than the inner diameter of the waste water inlet 19. The inside of the drainage inlet 19 can be widely overlooked.

In this embodiment, since the gripping portions 25 capable of gripping the inner secondary pipe joint 1 are provided on both sides of the joint body 10, the gripping portions 25 of the inner secondary pipe joint 1 can be gripped to stabilize the manhole. An inner secondary pipe joint 1 can be arranged within 2 . In this embodiment, the gripping portions 25 are provided on both sides of the joint body 10, but the gripping portion may be provided at one location. Further, a hole into which a hand can be inserted may be provided on the upper left and right sides of the vertical tube portion 11 or on one end side of the upper portion to serve as a grip portion.

In this embodiment, a water stop ring 13b is attached to the secondary pipe connection portion 13 having the drainage outlet 13a, and the water stop ring 13b is formed with an annular ridge 13d that protrudes upward and is inserted from below. Since it functions as a mechanism for retaining the pipe, the pipe can be easily connected to the drainage outlet 13a.

Further, in this embodiment, the secondary pipe connection portion 13 is formed with an enlarged diameter portion 13e tapered upward, and the insertion port of the straight pipe 4 or the curved pipe 5 is inserted into the secondary pipe connection portion 13. Even after the straight tube 4 or the curved tube 5 is inserted into the tube, the insertion angle of the straight tube 4 or the bent tube 5 can be adjusted within the range of the inner diameter of the enlarged diameter portion 13e. In addition, the secondary pipe connection portion 13 may be configured without the enlarged diameter portion 13e. Alternatively, the auxiliary pipe connection portion 13 may be a simple socket without the water stop ring 13b. In this case, the secondary pipe should be inserted into the socket and fixed with an adhesive.

In this embodiment, the joint main body 10 is formed with a mounting portion 21 for mounting the inner sub pipe joint 1 on the inner wall of the manhole 2. The mounting portion 21 has an insertion hole through which a mounting member such as a bolt B can be inserted. 22 and a temporary fixing hole 23a for temporarily fixing to the inner wall of the manhole 2 are formed. The attachment portion 21 can be attached to the inner wall of the manhole 2 by the above.

In addition, in this embodiment, indexing projections 24a and 24b indicating the center position of the drainage inlet 19 are formed on the mounting portion 21, and the drainage inlet is invisible from the operator side when installed on the inner wall of the manhole 2. The work can be performed while confirming the center position of 19. In the present embodiment, the convex portion is formed on the mounting portion 21 to serve as an index indicating the central position of the drainage inlet 19. However, the groove may also be used as an index indicating the central position of the drainage inlet 19. good. Moreover, the position of the index may be on the side surface of the attachment portion 21 .

In this embodiment, a spacer 30 corresponding to the inner wall shape of the manhole 2 can be attached to the attachment portion 21, and the common inner sub pipe joint 1 can be installed in manholes 2 having different inner wall shapes. .

In addition, in this embodiment, the spacer 30 is formed with a locking piece 35 that locks onto the mounting portion 21 of the joint body 10 . Since the inner sub pipe joint 1 can be installed on the inner wall of the manhole 2 in a compacted state, the inner sub pipe joint 1 can be installed efficiently.

In this embodiment, two pairs of locking pieces 35, 35 are provided at approximately the center on both left and right sides of the spacer 30, and are locked to the mounting portion 21 of the joint main body 10. The number, shape, and position of the locking pieces can be varied as long as they can be locked to the mounting portion 21 of the main body 10, and the same effects can be obtained. Alternatively, a locking metal fitting separate from the spacer 30 may be attached to the groove portion of the spacer 30 or the like, and the spacer 30 may be locked to the mounting portion 21 of the joint body 10 via the locking metal fitting. Moreover, without using a locking piece or a locking metal fitting, the projections 36a, 36b, and 36c are fitted into the notch 21b, the groove 21c, and the groove 21d formed in the mounting surface 21a, respectively. The spacer 30 may be integrated with the mounting portion 21 by the force with which the spacers 36a, 36b, and 36c are clamped. Moreover, the mounting portion 21 is fitted into the receiving portion 34 formed on the spacer 30 without using a locking piece or a locking metal fitting, and the force of being clamped by the receiving portion 34 causes the spacer 30 to move between the mounting portion 21 and the mounting portion 21 . The spacer 30 is attached by integrating the spacer 30, or by attaching an elastic material such as a rubber ring for retaining in the receiving portion 34, and clamping the attaching portion 21 fitted to the receiving portion 34 by the elastic force thereof. You may make it integrate with the part 21. FIG. Alternatively, a plurality of inward ribs may be provided on the receiving portion 34, and the mounting portion 21 fitted to the receiving portion 34 may be clamped by the plurality of ribs so that the spacer 30 is integrated with the mounting portion 21. .

Alternatively, the spacer 30 and the joint body 10 may be separately attached without providing a structure for integrating the spacer 30 such as the locking piece and the attachment portion 21 . In this case, for example, a spacer 30 that conforms to the inner diameter of the manhole 2 is temporarily fixed to the inner wall of the manhole 2 with a temporary fixing bolt, an adhesive, or the like, and then the joint body 10 is appropriately attached to the temporarily fixed spacer 30. position, and fixed to the inner wall of the manhole 2 together with the spacer 30 with a mounting member such as a bolt.

Further, in this embodiment, the spacer 30 is provided with a temporary fixing hole 33 at a position corresponding to the temporary fixing hole 23a formed in the mounting portion 21. When the inner secondary pipe joint 1 is attached via the spacer 30, However, the inner sub pipe joint 1 can be temporarily fixed using the temporary fixing hole 23a.

In addition, by making the outer shape of the spacer 30, including the shape of the temporary fixing portion 23, substantially the same as the outer diameter of the mounting portion 21, when mounting the inner sub-pipe joint 1 to the inner wall of the manhole 2 via the spacer 30, Makes the work of caulking easier.

In this embodiment, annular grooves 21c and 21d are formed in a double manner on the mounting surface 21a of the mounting portion 21, and when installed on the inner wall of the manhole 2, the waterproof packing P is arranged in the groove 21d. It is possible to reduce the weight of the joint body 10 by providing the groove portion 21c which is not used for sealing. In addition, it is good also as a structure which seals both the groove parts 21c and 21d.

In this embodiment, the mounting surface 21a of the mounting portion 21 is formed with an annular cutout portion 21b into which the flange portion 40b of the flexible joint 40 that connects the drain pipe 3 to the inner wall of the manhole 2 can be fitted. By fitting the flange portion 40b of the flexible joint 40 into the notch portion 21b of the mounting portion 21, the thickness of the flange portion 40b of the flexible joint 40 is released into the notch portion 21b, and the mounting portion 21 is mounted. can be installed on the inner wall of the manhole.

In this embodiment, annular grooves 37b and 37c are formed in a double manner on the mounting surface 30b of the spacer 30 which is installed on the inner wall of the manhole 2. When the spacer 30 is installed on the inner wall of the manhole 2, the groove 37c is used to stop water. The spacer 30 can be made lighter by providing the groove portion 37b that is not used for sealing while sealing is achieved by arranging the packing P. As shown in FIG. In addition, it is good also as a structure which seals both the groove parts 37b and 37c.

In this embodiment, the mounting surface 30b of the spacer 30 installed on the inner wall of the manhole 2 can be fitted with the flange portion 40b of the flexible joint 40 that connects the drain pipe 3 to the inner wall of the manhole 2. An annular notch portion 37a is formed, and by fitting the flange portion 40b of the flexible joint 40 into the notch portion 37a of the spacer 30, the thickness of the flange portion 40b of the flexible joint 40 is released into the notch portion 37a. The spacer 30 can be installed on the inner wall of the manhole in this state.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention. be

[Regarding Modification 1]
In the inner sub-pipe joint 1 of the present embodiment, the vertical pipe portion 11 is formed integrally. The shape of the portion 111 is substantially the same as the shape of the vertical pipe portion 11, but the upper vertical pipe portion 111a, which is molded integrally with the joint body 110 and whose width and depth dimensions do not change, and the upper vertical pipe portion 111a It has a two-piece structure consisting of a lower vertical tube portion 111b which is formed separately from 111a and whose width dimension gradually narrows while its depth dimension does not change. Structures other than the vertical pipe portion 111 are the same as those of the inner sub pipe joint 1 .

The lower vertical pipe portion 111b has a socket 111c formed at its upper end into which the lower end of the upper vertical pipe portion 111a can be inserted. It's becoming

As a result, as shown in FIG. 12B, by connecting the lower end of the upper vertical pipe portion 111a to the lower vertical pipe portion 111b, the secondary pipe connection portion 13 is formed integrally with the lower end of the lower vertical pipe portion 111b. , the spigot of the straight tube 4 or the curved tube 5 can be connected, while as shown in FIG. It is also possible to directly connect an elliptical straight tube 104 having sockets 104a and 105a formed at one end thereof into which the lower end of the upper vertical tube portion 111a can be inserted, and the sockets 104a and 105a of an elliptical curved tube 105. can.

In addition, although not shown, it is preferable to provide the socket 111c with a water stop ring that functions as a retaining mechanism like the secondary pipe connection part 13. The lower end of the upper vertical tube portion 111a can be easily connected. Further, similarly to the secondary pipe connection portion 13, the socket 111c is preferably formed with a diameter-expanded portion that tapers and expands in the opposite direction to the opening of the socket 111c. Even after the lower end of the upper vertical tube portion 111a is inserted into the socket 111c, the insertion angle of the lower end of the upper vertical tube portion 111a can be adjusted within the range of the inner diameter of the enlarged diameter portion. The socket 111c may be a simple socket without a water stop ring. In this case, the lower end of the upper vertical tube portion 111a may be inserted into the socket 111c and fixed with an adhesive. .

Further, the inner secondary pipe joint 101 has a socket 111c formed at the upper end of the lower vertical pipe portion 111b, but the socket 111c is not formed at the upper end of the lower vertical pipe portion 111b, and the lower end of the upper vertical pipe portion 111a is not formed. , a socket (not shown) into which the upper end of the lower vertical tube portion 111b can be inserted is formed, and the upper end (insertion) of the lower vertical tube portion 111b is inserted into this socket to enable integral connection, With such a configuration, the spigots of the straight tube 104 and the curved tube 105 having the same cross-sectional shape as the upper vertical tube portion 111a can be directly connected.

Further, in such a configuration, it is preferable to provide a water stop ring functioning as a retaining mechanism like the secondary pipe connecting portion 13 at the socket formed at the lower end of the upper vertical pipe portion 111a. By doing so, the upper end of the lower vertical pipe portion 111b can be easily connected to the socket formed at the lower end of the upper vertical pipe portion 111a. In addition, the socket formed at the lower end of the upper vertical pipe portion 111a is preferably formed with an enlarged diameter portion that tapers in the opposite direction to the opening of the socket, similarly to the secondary pipe connection portion 13 . With such a configuration, even after inserting the upper end of the lower vertical pipe portion 111b, the straight pipe 104, or the bent pipe 105 into the socket, the lower vertical pipe portion 111b can be kept within the range of the inner diameter of the expanded diameter portion. , and the insertion angle of the straight tube 104 and the curved tube 105 can be adjusted. The socket formed at the lower end of the upper vertical pipe portion 111a may be a simple socket without a water stop ring. Insert it and fix it with glue.

[Regarding modification 2]
In the inner secondary pipe joint 201 of Modification 2, as shown in FIGS. 13A and 13B, the width dimension of the vertical pipe portion 211 is larger than the depth dimension, and the width dimension and the depth dimension change from the upper end to the lower end. It is formed in a substantially elliptical cross-sectional shape, and its upper end is open to form an upper inspection port 212 and its lower end is also opened to form a lower outlet port 213 . The cross-sectional shape of the vertical pipe portion 211 is the same as the cross-sectional shape of the upper portion 11 a of the vertical pipe portion 11 of the inner sub pipe joint 1 . Structures other than the vertical pipe portion 111 are the same as those of the inner sub pipe joint 1 .

The lower end of the vertical pipe portion 211 is formed with a socket 214 into which the upper end of the vertical pipe portion 11 of the inner secondary pipe joint 1 and the upper end of the inner secondary pipe joint 201 can be fitted. The upper end of the vertical pipe portion 11 of No. 1 or the upper end of the inner secondary pipe joint 201 may be inserted and connected to the upper end of the vertical pipe portion 11 of the inner secondary pipe joint 1 or the upper end of the vertical pipe portion 211 of the inner secondary pipe joint 201. It is possible.

As a result, as shown in FIGS. 13(a) and 13(b), a single or a plurality of inner secondary pipe joints are connected to the plurality of drain pipes 3, 3 vertically connected to the inner wall of the manhole 2 at upper and lower positions. 201 and the inner sub pipe joint 1 can be installed by connecting them vertically. By doing so, the drainage discharged from the plurality of drainage pipes 3, 3 can be collected.

In addition, although not shown, it is preferable to provide the socket 214 with a water stop ring that functions as a retaining mechanism similar to the secondary pipe connection part 13. With this configuration, the socket 214 can be The upper end of the vertical pipe portion 11 of the inner sub pipe joint 1 can be easily connected. Further, similarly to the secondary pipe connecting portion 13, the socket 214 preferably has an enlarged diameter portion that tapers in the opposite direction to the opening of the socket 214. , even after the upper end of the vertical pipe portion 11 of the inner sub pipe joint 1 is inserted into the socket 214, the insertion angle of the upper end of the vertical pipe portion 11 can be adjusted within the range of the inner diameter of the expanded diameter portion.

[Regarding modification 3]
In the inner secondary pipe joint 301 of Modification 3, as shown in FIGS. Instead of the through holes 22 formed in the portion 21, through holes 302 are formed at the four corners of the mounting portion 321. The through holes 302 consist of a large-diameter circular hole and a small-diameter long hole extending upward from the circular hole. The large-diameter circular hole is sized to allow the head of the bolt B to pass through, and the lateral width of the long hole is narrower than the head of the bolt B and sized to allow the shaft of the bolt B to pass through. be. Insertion holes 303 having the same shape as the insertion holes 302 are also formed at positions corresponding to the insertion holes 302 of the spacer 330 .

When installing the inner secondary pipe joint 301 of Modified Example 3 in the manhole 2, the mounting surface 330b of the spacer 330 integrated with the joint body 310 is brought into contact with the inner wall of the manhole 2, and aligned. Determine position. At this time, temporary fixing bolts (not shown) inserted through the temporary fixing holes 23 a and 33 may be temporarily fixed to the inner wall of the manhole 2 .

Then, a bolt B is driven into a predetermined position on the inner wall of the manhole 2 in advance, and then, as shown in FIG. The mounting surface 330b of the spacer 330 integrated with the spacer 310 is brought into contact with the inner wall of the manhole 2, and as shown in FIG. The head of the bolt B is supported around the long hole of the hole 302 , and the inner secondary pipe joint 301 is attached to the inner wall of the manhole 2 . When attaching to the No. 1 manhole 2a, the mounting surface 321a of the mounting portion 321 of the joint body 310 is brought into contact with the inner wall of the manhole 2a without using the spacer 330, and the position of the bolt B is determined by aligning. Then, a bolt B is driven into a predetermined position on the inner wall of the manhole 2a in advance, and then the head of the bolt B is inserted into the circular hole of the insertion hole 302 so that the mounting surface 321a of the mounting portion 321 of the joint main body 310 is attached to the manhole 2a. , and slide the entire inner sub-pipe joint 301 downward.

This makes it possible to drive in the bolt B while the inner sub-pipe joint 301 is once separated from the inner wall of the manhole 2 .

[Regarding modification 4]
In the inner sub-pipe joint 401 of Modification 4, as shown in FIGS. A portion of the mounting portion 421 is formed to have a substantially semi-elliptical cross section that constitutes the wall of the vertical pipe portion 411 on the side of the drainage inlet 419 . Further, the vertical pipe portion 411 does not have the extended pipe portion 18 unlike the joint main body 10 of the inner sub pipe joint 1 , and the drainage inlet 419 is formed directly in the vertical pipe portion 411 . Similar to the vertical pipe portion 11 of the inner sub pipe joint 1, the lower portion 11b of the vertical pipe portion 411 has a tapered shape in which the width dimension gradually narrows downward from a position below the lower end portion of the drainage inlet 419. On the other hand, the depth dimension remains substantially the same and does not change downward, the width dimension and depth dimension are reduced to a circular cross-sectional shape smaller than the outer diameter of the drain pipe 3, and the secondary pipe A connecting portion 413 is formed.

With such a configuration, a part of the mounting portion 421 constitutes the wall of the vertical pipe portion 411 on the side of the drainage inlet 419, so an extended pipe portion connected to the mounting portion 421 is not required, and the material is reduced. In addition to reducing the amount, the depth width of the joint main body 410 is reduced, and the work space in the manhole 2 in which the inner sub pipe joint 401 is installed can be secured.

[Regarding modification 5]
In the inner secondary pipe joint 1 of this embodiment, as shown in FIG. As shown in FIG. 16B, the vertical pipe portion extends over the entire inner peripheral bottom surface of the extended pipe portion 18 in the joint body 10, as shown in FIG. 16(b). A recessed portion 20 ′ having a shape that is notched so as to extend toward the inner peripheral surface of 11 may be formed.

[Regarding modification 6]
The spacer 30 of the present embodiment is integrally molded, but the spacer 630 of Modification 6 has a two-piece structure separated vertically, as shown in FIG. The spacer 630 is composed of an upper spacer member 631 and a lower spacer member 632, as shown in FIGS. 17(a) and 17(b).

The upper spacer member 631 has a notch 631a formed on the lower mounting surface side, and a convex portion 631b projecting to the side opposite to the joint main body 10 is formed at the lower end of the notch 631a. On the other hand, the lower spacer member 632 is formed with a cutout 632a having substantially the same shape as the cutout 631a on the upper non-mounting surface side, and a recessed portion 632b having substantially the same shape as the projection 631b is formed at the lower end of the cutout 532a. be. Two pairs of locking pieces 635, 635 having the same shape as the spacer 30 are formed on the left and right sides of the lower spacer member 632 toward the joint main body 10 side.

Then, as shown in FIG. 17(c), by assembling the notch 631a of the upper spacer member 631 with the notch 632a of the lower spacer member 632, the protrusion 631b fits into the recess 632b to form an integrated spacer 630. As shown in FIG.

Further, since the locking piece 635 is provided on the lower spacer member 632 having the notch 632a formed on the upper non-mounting surface side, the spacer 630 is assembled to the mounting portion 21 of the joint body 10 so that both sides of the mounting portion 21 are By being locked by the locking claws 35a, the lower portion of the upper spacer member 631 is sandwiched between the upper non-mounting surface side of the lower spacer member 632 and the mounting portion 21, and the convex portion 631b is fitted into the concave portion 632b. Since the separation in the vertical direction is also restricted, the upper spacer member 631, the lower spacer member 632, and the joint body 10 are integrally assembled, and the upper spacer member 631 and the lower spacer member 632 are separated. I never end up doing it.

With such a configuration, the spacer 630 has a two-piece structure that can be separated vertically, so even if the opening 6 of the manhole 2 is narrow, it can be easily brought inside by dividing the spacer 630 . . In Modification 6, the spacer 630 has a two-piece structure that can be separated vertically, but it may have a two-piece structure that can be separated left and right, or a structure that can be divided into three or more pieces. Also in terms of structure, it can be easily brought into the manhole 2 by dividing the spacer 630 .

[Regarding modification 7]
Although the spacer 30 of this embodiment is made of synthetic resin, it may be made of a flexible material such as rubber. However, by dividing the spacer 630, it can be easily brought inside.

1 inner sub-pipe joint 2 manhole 3 drain pipe (inflow pipe)
10 Joint main body 11 Vertical pipe portion 13 Secondary pipe connection portion 13a Drainage outlet (outlet)
14 Inspection port 14a Inspection port 15 Inspection port lid 18 Extension pipe portion 19 Drainage inlet (inlet)
20 recessed portion 21 mounting portion 30 spacer

Claims (3)

An inner sub-pipe joint installed on the inner wall of a manhole,
an inflow port into which waste water from the inflow pipe flows;
a vertical pipe portion for causing the wastewater flowing in from the inlet to flow out from a lower outlet;
with
The upper portion of the vertical pipe portion is formed such that the width dimension along the circumferential direction of the inner wall of the manhole is longer than the depth dimension extending inside the inner wall of the manhole,
The inner secondary pipe joint, wherein the width dimension of the lower portion of the vertical pipe portion is gradually narrowed toward the outlet port. An inspection opening is formed in the vertical pipe portion at a position facing the inflow port,
The inner secondary pipe joint according to claim 1, wherein the inspection port is larger than the inner diameter of the inflow pipe. A mounting portion for mounting the vertical pipe portion to the inner wall of the manhole,
The inner sub-pipe joint according to claim 1 or 2, wherein a spacer corresponding to an inner wall shape of the manhole different from the inner wall of the manhole can be attached to the attachment portion.

Images