JP2669810B2 - Pipe mounting wall with inspection footrest - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe mounting wall provided at the bottom of a sewer manhole, and more particularly to a pipe mounting wall with a footrest for inspection provided with an invert for guiding treated water in a predetermined direction.

[0002]

2. Description of the Related Art FIG. 12 is a plan view showing the arrangement of manholes. A manhole 53 is provided at a branch point A and a bent path B portion of the sewage channel 51 provided along a route of the road 50 or the like. FIG. 13 is a side sectional view showing the manhole 53. As the manhole 53, an assembly type is used as illustrated. A pipe mounting wall 55, a straight wall 56, a sloping wall 57, an adjusting block 58, and a lid 59 are sequentially stacked on a base 54b that is horizontal on the foundation work portion 54a at the bottom to form a manhole 53.

A pipe (for example, a straight pipe having a predetermined diameter) 60 forming the sewer 51 is connected to a pipe mounting wall 55 provided at the bottom of the manhole 53. Pipe mounting wall 55
Is a straight pipe 60 having a predetermined height and connected to the side wall 55a.
The parts are connected by an invert 61 to form a predetermined flow path.

The invert 61 is an upstream straight pipe 60a.
Is provided to the downstream straight pipe 60b, and a straight pipe 60c that joins the straight pipe 60b is provided. These inverts 61 are formed such that their side cross sections are formed in a substantially semicircular shape by cutting. The invert 61 is connected diagonally at a substantially middle position of the linear invert 61 from the upstream side to the downstream side in order to allow the flow from the upstream to flow downstream without stopping. ing.

At the time of maintenance or the like, the operator may
5, the user places his / her foot on the substantially horizontal step surface 63 of the pipe mounting wall 55 and looks into the connecting portion with the straight pipe 60 for maintenance and inspection.

[0006]

However, the invert 61 of the conventional pipe mounting wall 55 is kneaded with concrete mortar at the site according to the straight pipes 60a to 60c connected to the sides of the pipe mounting wall 55. It was very troublesome.

Further, it takes time to make one invert 61 (a maximum of 2 to 3 places per day), and this construction work is performed at the bottom of the narrow manhole 53, which is dangerous. Moreover, it was not possible to immediately flush the water even after the construction. That is, there is a problem that it takes time to solidify the concrete (about one week), and when water intrudes from the straight pipe 60, it takes more time to solidify.

Since the number and connection direction of the straight pipes 60a to 60c connected to the pipe mounting wall 55, and the pipe diameter and the connection height position of the straight pipe 60 are different at each site and are almost infinite, Not only could it not be possible to prepare the invert 61 in advance by molding but it would be costly because it was made to order.

When the straight pipe 60c has a predetermined inflow step (600 mm or more), there is a risk of damage to the invert 61 due to the flowing water flow. In this case, as shown in FIG. Small diameter secondary pipe 6
0d (including the curved pipe 60e) needs to be provided, this material and connection work are required, and work for solidifying the side portion of the sub-pipe 60d with concrete as shown in the sectional view of FIG. 14 is required. , It took time and labor, and the construction cost increased.

Further, since the step surface 63 is provided at the side position of the invert 61, sewage and dirt are likely to be attached to the step surface 63, and the step surface 63 is easily formed.
Was always easy to get dirty and it was difficult to carry out inspection work.

The present invention has been made in order to solve the above-mentioned problems, and is a pipe mounting which allows an inflow of water to flow out without staying regardless of the number of connected straight pipes and the connecting direction. It is an object of the present invention to provide a pipe mounting wall with a footrest for inspection that can easily perform an inspection work inside a wall.

[0012]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided a pipe mounting wall with a footrest for inspection, which is attached to a side wall of a peripheral wall having a predetermined diameter. Is connected with a predetermined step (D) to the upstream pipe (60
a) and the downstream pipe (60b), an inclined portion (5) formed inside the peripheral wall portion and having a substantially conical shape whose side cross section is inclined at a predetermined angle, and for collecting a water flow in the central portion; A spherical wall portion (6) provided at the center and having a hemispherical side cross-section, and a lower flow passage formed through the peripheral wall portion and communicating from the downstream pipe to the inclined portion and the spherical wall portion ( 8)
An upper flow path (15) formed to penetrate the peripheral wall portion at a predetermined angle with respect to the lower flow path in a plane, and communicate with the inclined pipe and the spherical wall portion from the upstream pipe; A footrest (70) that is provided on the inclined part and that can be opened and closed at the time of inspection.

According to a second aspect of the present invention, a plurality of fixed pieces (71) are embedded in the inclined portion (5) at predetermined intervals.
And a base (75) of the footrest (70) fixed to the fixing piece via a fixing member (72), and a step which can be opened and closed with respect to the base about a rotation axis (78). (7
7), and a rotating operation piece (79) that stands upright at a predetermined angle on the back surface of the step, as an operation part when opening, and for maintaining the horizontal state of the step after opening. It may be configured.

Further, as described in claim 3, the footrest (70) is attached to a predetermined fixing piece (71) portion according to the arrangement angle of the upper flow path and the lower flow path, or is detachable. It may be.

According to a fourth aspect of the present invention, the inclined portion (5) and the spherical wall portion (6) in the upper half of the lower flow passage (8) are formed to have a width equal to the diameter of the lower flow passage. ) May be provided with a notch (40) for footrest having a shape cut out along (1).

A water flow such as sewage flowing from the upstream straight pipe 60a flows along the upper flow path 15 penetrating the peripheral wall portion 2 to the inner surface 3
After being collected on the spherical wall portion 6 in the central portion of the lower portion, it is guided from the lower channel 8 to the downstream straight pipe 60b. The lower flow path 8 is created in advance by forming a mold, and only the upper flow path 15 is formed in a circular shape corresponding to the position where the upstream straight pipe 60a is provided and the diameter of the straight pipe 60a on the spot, and these upstream flow paths are formed. The straight pipe 60a and the downstream straight pipe 60b smoothly flow through the upper flow path 15 to the spherical wall portion 6 to the lower flow path 8 without causing backflow or water flow fluctuation. Further, a substantially conical inclined portion 5 that is inclined at a predetermined angle is formed on the upper portion of the spherical wall portion 6, and even if the water flow of the upper flow path 15 flows into the inclined portion 5, all the water flow of the inclined portion 5 is the spherical wall portion. Collected in 6. The inclined portion 5 is provided with two footrests 70 fixed to the fixing pieces 71 so as to face each other.
Step 0 is opened, and a step on which the inspection worker straddles is secured, and the inspection work can be performed safely and easily. Since the footrest 70 is openable and closable, it is easy to carry in large-sized materials and instruments when it is closed during inspection and maintenance. It can also be easily removed if necessary. In addition, the inclined portion 5 in the upper half of the lower flow path 8
By providing the footrest notch 40 which is formed by notching the spherical wall portion 6 with the width of the diameter of the lower channel 8, the space for placing the foot of the worker can be secured, and the posture can be easily changed. 8 Be able to easily inspect the inside.

[0017]

1 is a side sectional view showing an embodiment of a pipe mounting wall with a footrest for inspection 1 of the present invention, and FIG. 2 is a plan view of the same. The same components as those in the conventional example are designated by the same reference numerals. The pipe mounting wall 1 is installed on the base 54. On the upper surface of the base 54, a fitting groove 54a corresponding to the outer diameter of the tube mounting wall 1 is formed, thereby preventing displacement of the installed tube mounting wall 1 after installation. The peripheral wall portion 2 is formed in a circular shape with a predetermined diameter, and the bottom portions are formed continuously with each other. A continuous concave groove 2a is formed at the upper end of the peripheral wall 2 having a predetermined thickness, and the convex groove provided at the lower end of the straight wall 56 is fitted and positioned via a moisture-proof rubber.

The inner side surface 3 of the peripheral wall portion 2 is a vertical surface 4 of a predetermined length which is vertical from the upper portion, and is continuous with the vertical surface 4 and is inclined linearly at a predetermined angle (45 degrees) when viewed from the side surface of FIG. Conical (mortar-shaped) slope 5, slope 5 located at the center bottom
It is composed of a spherical wall portion 6 continuous with. In addition, the inner side surface 3 does not need to form the vertical surface 4, and the upper end of the inclined portion 5 may be located at the upper end of the peripheral wall 2.

The spherical wall 6 has a radius of a predetermined diameter when viewed in the plan view of FIG. 2, the whole is formed in a hemispherical shape, and the central portion 6a is provided at the lowest position. A lower channel 8 is formed horizontally in one direction from the center 6a of the spherical wall 6 as shown in FIG. Here, the lower flow path 8 and an upper flow path 15 described later have a predetermined step D (pipe bottom difference: 30 mm). In this lower flow path 8, since the step D is constant,
As shown in FIG. 2, when viewed in a plane, a portion that is partially exposed is formed in a substantially sector shape.

This lower flow path 8 is connected to the downstream straight pipe 60b. In order to connect the straight pipe 60b, the peripheral wall portion 2 has a downstream connecting portion 10 having a predetermined diameter corresponding to the outer diameter of the straight pipe 60b. Therefore, as shown in FIG. 1, the lower flow path 8 is formed in a part of the spherical wall portion 6 and the inclined portion 5 that constitute the inner side surface 3.

In the pipe mounting wall 1 described above, the peripheral wall portion 2, the inner side surface 3 and the lower flow path 8 are integrally formed beforehand by concrete molding. Further, as other materials, a hard resin material such as plastic, an unsaturated polyester resin material (resin), or the like can be used. Alternatively, the whole may be formed of concrete, and a resin material may be applied only to the inner surface 3 surface. In this case, it is desirable that the resin material is applied to the surfaces of the lower flow path 8 and the upper flow path 15, which will be described later, and is applied to the entire area where sewage comes into contact.

An upstream straight pipe 60a is connected to the peripheral wall portion 2. For example, as shown in FIGS. 1 and 2, an upstream straight pipe 60a is connected to a position facing the downstream straight pipe 60b. In this case, the pipe mounting wall 1 is drilled in a horizontal direction by a core cutter in a circular shape having a diameter corresponding to the inner diameter of the straight pipe 60a.

At the time of drilling, as shown in FIG. 1, drilling is performed so that the bottom of the drilling (the bottom of the straight pipe 60a on the upstream side) is at a position higher than the predetermined step D from the lower flow path 8. Due to this drilling, as shown in FIG. 2, the end portion 15a is located on a part of the circular arc surface of the spherical wall portion 6, and the upper channel 15 partially exposed is formed. At the same time, in order to connect the straight pipe 60a to the peripheral wall portion 2, an upstream connecting portion 11 having a predetermined diameter corresponding to the outer diameter of the straight pipe 60a is drilled.

These upstream connecting portion 11 and upstream straight pipe 60
a, and a rubber ring 20 and a mortar packing member 21 are provided between the downstream connection portion 10 and the downstream straight pipe 60b, respectively, to fix the connection state therebetween.

The operation of the pipe mounting wall 1 having the above structure will be described. The sewage flowing from the upstream straight pipe 60a into the inner inner surface 3 flows into the spherical wall portion 6 from the upper channel 15 portion. At this time, a part of the sewage flowing through the upper flow path 15 may reach the upper part of the inclined part 15, but since the inclined part 15 has an inclination angle of 45 degrees, the sewage immediately flows into the spherical wall part 6. Flow in the direction. Therefore, the sewage in the upper flow path 15 can be concentrated on the spherical wall portion 6 and does not stay in the inclined portion 15 for a long time, so that it is possible to prevent adhesion of dirt and solidification due to drying after the adhesion.

At the same time, the connection point A between the spherical wall portion 6 and the inclined portion 15 has a configuration in which the semicircular portion of the spherical wall portion 6 is connected to the inclined portion 15 and has a predetermined angle. In addition, it is possible to prevent the sewage flowing into the spherical wall portion 6 from splashing on the inclined portion 15 again. Further, since the spherical wall 6 is hemispherical, there is no place in the spherical wall 6 where sewage remains. Subsequently, the sewage of the spherical wall 6 flows into the lower channel 8 from the spherical wall 6. At this time, since the spherical wall portion 6 is spherical, the central portion 6a located at the bottom is in contact with the lower flow passage 8 at a point, and all the sewage inside the curved wall portion 6 can be discharged to the lower flow passage 8. The sewage of the lower passage 8 is guided to the downstream straight pipe 60b and flows out.
The upstream straight pipe 60a and the downstream straight pipe 60b have the predetermined step D.

As described above, inside the pipe mounting wall 1, the inner side surface 3 having the inclined portion 5 and the spherical wall portion 6 constituting the invert are provided.
Since the sewage that has flowed into the inside of the pipe mounting wall 1 is guided to the spherical wall portion 6 by the inclined portion 5 and can be concentrated on the spherical wall portion 6, the sewage can be discharged outside without disturbing the water flow. Can be drained to.

Accordingly, in the tube mounting wall 1 of the above-described integral type, the upper flow path 15 can be provided at an arbitrary angle position. For example, in the case where the upstream straight pipe 60a is provided in a direction perpendicular to the downstream straight pipe 60b by 90 degrees, first, the lower flow path 8 is positioned and installed in the direction of the downstream straight pipe 60b. 1 and 2, the upper channel 15 may be formed by drilling the peripheral wall 2 in the direction in which the upstream straight pipe 60a is provided. Thus, even when the upper flow path 15 and the lower flow path 8 are provided in a direction orthogonal to each other by 90 degrees, the sewage is immediately collected from the upper flow path 15 to the spherical wall portion 6 without staying at a specific location, You can lead to 8.

As described above, at the site, after the lower flow path 8 provided in advance is aligned with the position of the downstream straight pipe 60b, the peripheral wall portion 2 at the position where another straight pipe (the upstream straight pipe 60a) is provided.
Can be formed only by drilling holes, and the invert angle can be set arbitrarily as compared with the conventional method of forming an invert with mortar on site.

Further, the straight pipe 60a on the upstream side is indicated by 1 in FIG.
It may be provided in one place or more, that is, two places or more. For example, the upper flow path 15 shown in FIG.
Even when a total of two locations in the upper flow path 15 at the position indicated by the dashed-dotted line are drilled, the sewage flowing from the upstream straight pipe 60a at these two locations can flow out to the downstream straight pipe 60b through the lower flow path 8. it can. Thereby, according to this pipe mounting wall 1, it is possible to cope with all the inflow angles that differ depending on each site.
Furthermore, when the inflow step D is 30 mm or more,
The upper flow path 15 may be located not only on the inclined portion 5 but also on the vertical surface 4 portion. In this case, the vertical surface 4 is also formed by cutting.

Next, FIG. 3 is a sectional side view showing the pipe mounting wall 1 installed at a site where a drop between the upstream straight pipe 60a and the downstream straight pipe 60b is large. Normally, when the inflow level difference between the upstream straight pipe 60a and the downstream straight pipe 60b exceeds 600 mm, a secondary pipe is branched and connected to the upstream straight pipe 60a according to the industrial standard, and this secondary pipe is newly attached. It is adapted to be connected to a lower position of the wall 1. However, according to the pipe mounting wall 1 of the invert integrated type having the above configuration, it is not necessary to provide the auxiliary pipe, and the material and construction costs can be reduced and the cost can be reduced.

That is, as shown in FIG. 3, when the inflow step is 600 mm, the upstream straight pipe 60a is located at the joint position between the pipe mounting wall 1 and the upper straight wall 56, so that the pipe is The upper flow path 15 is not formed in the mounting wall 1.
Thus, even when the inflow step between the upstream straight pipe 60a and the downstream straight pipe 60b is large (including, for example, the case where the straight pipe exceeds 600 mm), the sewage flowing from the upstream straight pipe 60a (shown by an arrow in the figure). ) Can reduce the resistance at the time of flowing down by the inclined portion 5 having an inclination angle of 45 degrees, can prevent damage to the inner surface 3, particularly without damaging the surface of the inclined portion 5, and also facilitate inversion and outflow. Since it can be performed, it is not necessary to provide a sub pipe.

According to each of the above embodiments, the pipe mounting wall 1 can be formed in advance by molding.
Make-to-stock production is possible, the formwork is also the inner diameter of the straight pipes 60a, 60b,
It is only necessary to prepare multiple types according to the outer diameter. Further, at the site, since the work of forming the upstream connecting portion 11 and the upper flow path 15 by drilling the peripheral wall portion 2 is sufficient, the work can be facilitated and the drilling is performed in a short time after drilling. Will be able to.

The upstream and downstream straight pipes 60a and 60b in the above embodiment preferably have a spherical wall portion 6 having a diameter of 300 mm (radius 150 mm) when the inner diameter is 250 mm. When the diameter is 300 mm, the straight pipes 60a and 60b are general-purpose pipes having inner diameters of 150 and 20.
The one having a thickness of 0,250 mm can be used, and in any case, the same effect as above can be obtained. When the inner diameters of the straight pipes 60a and 60b are 300 and 350 mm, it is preferable that the spherical wall 6 has a diameter of 400 mm. That is, the inversion action of the water flow is obtained by making the diameter of the spherical wall portion 6 at least larger than the inner diameters of the upstream and downstream straight pipes 60a and 60b.

Further, the sewer manhole is not limited to the one having a circular plane as in the above example, but also a square or an ellipse (oblong circle).
There are things. FIG. 4 shows a tube mounting wall 25 provided at the bottom of a square manhole. As shown in the drawing, basically, the above-mentioned configuration of the pipe mounting wall 1, that is, the configuration in which the inclined portion 5 and the spherical wall portion 6 are provided, is added, and the square peripheral wall portion 2 is newly added.
6. By forming the concave groove 26a and providing the continuous portion 27 filling the space between the upper end of the inclined portion 5 and the peripheral wall portion 2, the same operation as in the above-described embodiment can be performed even in a square manhole. The effect can be obtained.

Similarly, the structure of the pipe mounting wall 1 is also used for the bottom portion of the elliptical manhole shown in FIG. 5, and a new pipe mounting wall is provided with an elliptical peripheral wall portion 36, a concave groove 36a, and a continuous portion 37. According to 35, the same operation and effect as in the above embodiment can be obtained also in this elliptical manhole. still,
The upper flow path 15 and the lower flow path 8 can be provided in all pipe mounting walls 25 and 35 in all directions.

Next, a footrest 70 that can be freely opened and closed is provided on each inclined portion 5 of each of the pipe mounting walls 1, 25, and 35 described above for maintenance and inspection of the inside. FIG. 6 is a sectional view showing the pipe mounting wall 1 at an angle different from that of FIG. 1 by 90 degrees. FIG. 7 is a plan view of the tube mounting wall 1, and FIG. 8 is a perspective view showing the footrest 70. In this way, since the inclined portion 5 has a conical shape and is inclined downward when viewed from the side cross section, the foot cannot be placed inside the inclined portion 5 as it is.

In this footrest 70, a fixing piece 71 having a bolt mounting hole is previously inserted inside the inclined portion 5 when the pipe mounting wall 1 is molded, and the fixing piece 71 is fixed with a bolt as a fixing member. It can be fixed using 72. Fixed piece 71
Are equally divided on the circumference, and as shown in FIG.
The fixing pieces 71 are respectively provided at eight positions at 45 degrees perpendicular to the surface of the inclined portion 5. The fixing piece 71 is ceramic-coated and has corrosion resistance.

The footrest 70 is composed of a base 75 and a step 77, and the base 75 and the step 77 are molded with a resin material. The pedestal 75 has the inclined portion 5
Surface 7 having a predetermined curvature corresponding to the outer diameter of the surface of the
5a and a shaft holding portion 75b erected from both sides. The two fixing pieces 71 are provided on the joint surface portion 75a.
The fixing holes 76 corresponding to the intervals are formed, and they are joined and fixed to the fixing pieces 71 at desired two positions along the inclined portion 5 by using bolts 72 as fixing members. The bolt 72 has a corrosion-resistant surface whose surface is coated with ceramic or resin.

Each of the shaft holding portions 75b has a rotating shaft 78.
Is provided and rotatably holds step 77. The step 77 has a predetermined width and a predetermined length, but it is sufficient that the step 77 can secure a width enough to place one foot. On this step 77, an uneven pattern 77a for preventing slippage is formed. Instead of the uneven pattern 77a, a plurality of holes penetrating the front and back of the step 77 may be formed. Further, on the back surface of step 77, a turning operation piece 79 is provided at a position near the axis of the turning shaft 78 at a predetermined angle with respect to the back surface. As shown in FIGS. 6 and 7, the rotation operation piece 79 is inclined and erected at an angle such that the locking surface 79a is in contact with the joining surface portion 75a and the step 77 is in a horizontal state in a state where the step 77 is released.

This footrest 70 has a lower flow path 8 and an upper flow path 15.
The installation position is determined according to the arrangement position of the. For example, as shown in FIG. 7, when the upper flow path 15 and the lower flow path 8 are arranged on a straight line, the footrests 70 are respectively provided in the direction orthogonal to this. At this time, the unused fixing piece 71
A resin bolt cap is screwed into and fixed to the portion to prevent corrosion of the exposed fixing piece 71. Also,
When the upper flow path 15 is disposed at a direction of 90 degrees with respect to the lower flow path 8 as shown by a one-dot chain line in the figure, one footrest 70 avoids the position of the upper flow path 15 and is orthogonal to the other. It can be mounted and the two footrests 70 can also be installed without juxtaposition with each other.

As described above, the footrest 70 can be provided at a predetermined angular position in accordance with the positional relationship between the upper flow path 15 and the lower flow path 8.
The position of 0 can be changed. When the fixing piece 71 has a sufficient thickness on the upper flow path 15 and the lower flow path 8, the foot rest 7 is placed on the lower flow path 8 and the upper flow path 15.
0 can also be provided. However, the upper channel 15
However, if there is a predetermined head as shown in FIG.
When the footrest 70 is provided at a position that extends between the inclined portion 5 and the vertical surface 4, the footrest 70 needs to be provided at a position avoiding the position of the upper flow path 15.

The footrest 70 thus provided is
Normally, as shown in FIG. 9, the step 77 is closed along the surface of the inclined portion 5 about the rotation shaft 78. In this state, sewage and dirt can be prevented from accumulating on the surface of the step 77, and dust or the like from the upper part does not adhere to the step surface 77. In this state, since the predetermined gap 80 is vacant between the base 77 and the step 77 in the same state, even if there is a rebound of sewage or the like, the water can flow downward through the gap 80.

At the time of inspection, the trap 65
An inspector who comes down by kicking the turning operation piece 79 with his / her foot can turn and open step 77, which can be facilitated. The operator can peep and inspect the inside of the straight pipes 60a and 60b with both feet placed on the footrest 70. After the inspection, the closed state can be achieved by simply kicking up the step 77 with the foot, so that no manual operation is required. Further, even when a large inspection device is carried in, the footrest 70 can be removed by simply removing the bolt 72, and the inspection work can be facilitated.

Next, FIG. 10 is a side sectional view showing another embodiment of the present invention, and FIG. 11 is a plan view of the same. In the figure, the same components as those in each of the above-described embodiments are designated by the same reference numerals. Inner surface 3 of the pipe mounting wall 1 having the above-mentioned configuration
Is composed of a mortar-shaped inclined portion 5 and a spherical wall portion 6, and the spherical wall portion 6 has a diameter of, for example, 300 mm.
The operator cannot easily inspect the inside of the lower channel 8 and the upper channel 15. In order to do this, the posture cannot be changed even if the foot is placed on the spherical wall portion 6, and therefore the inner depths of the lower flow path 8 and the upper flow path 15 cannot be visually inspected directly. It is also impossible to insert a hand in the back.

Therefore, in this embodiment, as shown in these figures, a notch portion 40 for footrest is provided on the pipe mounting wall 1 for inspection and actual construction and repair work.
As described above, the pipe mounting wall 1 includes the peripheral wall portion 2, the inner side surface 3,
The lower flow path 8 is integrally formed by molding in advance.
With the inner side surface 3 above the position of the lower flow path 8, that is, the inclined portion 5 and the spherical wall portion 6 partially cut out, the footrest notch 40 is provided by molding.

The foot notch 40 has a vertical surface 40a having the same width as the diameter of the lower channel 8 at an upper position from the upper half while leaving the lower half of the lower channel 8 as shown in the drawing. It is formed. In the notch portion 40 for footrest, the lower part of the inner side surface 3 is set as a slightly inclined surface 40b, and the downstream connection portion 10 has a predetermined thickness.

The foot notch 40 is provided in the lower channel 8.
Even if the upper flow path 15 formed above is cut and formed at a predetermined angle with respect to the lower flow path 8, the inclined portion 5 and the spherical wall portion 6 forming the invert form the pipe mounting wall. The sewage that has flowed into the inside of 1 is guided to the spherical wall portion 6 by this inclined portion 5 and can be concentrated on the spherical wall portion 6, so that it can be guided to the lower flow path 8 direction without the disturbance of the water flow. ing.

The provision of the footrest cutouts 40 makes it easier to inspect the inside of the lower flow path 8 and the upper flow path 15 inside the pipe mounting wall 1. For example, at the time of construction, the downstream connecting portion 10
The state of connection of the downstream straight pipe 60b can be correctly checked from inside the pipe mounting wall 1. The operator can secure a stable stepping foot at the cutout portion 40 for footrest, and can easily change the working posture inside the pipe mounting wall 1.

Although the notch 40 for footrest has a semicircular lower half, the upper part of the lower flow path 8 is notched, so that the joint surface of the straight pipe 60b can be seen closely. Further, since it can be easily touched by hand, it becomes possible to give an appropriate instruction to the operator who is outside the pipe mounting wall 1 and moves the straight pipe 60b toward the pipe mounting wall 1. . As an important inspection item during construction,
Accurately match the height of the lower end position 60bb of the inner peripheral surface of the straight pipe 60b with the height of the lower end position 8b of the lower flow path 8 (it is necessary to fix after precise height adjustment to prevent backflow). And joining the joint surface of the straight pipe 60b to the downstream connection part 10 (to prevent water leakage).
Since the internal worker can confirm any of the states closer by simply changing the posture, the construction work can be performed accurately and quickly.

At the time of this construction, the foot notch 4
By providing 0, it is possible to secure a large space for the footsteps of the worker and to change the posture easily. Therefore, visual inspection and manual insertion can be easily performed even in the inner direction of the upper flow path 15. Inspection of the height position and the joining state of the upstream straight pipe 60a can be easily performed.

Further, repair work after construction includes water leak repair and the like, and in checking the water leak state, an operator directly visually checks the inside direction of the lower flow path 8 (upper flow path 15) from the inside of the pipe mounting wall 1. Insert by hand. During this repair,
You will be able to perform repair work accurately and quickly.

In addition to the above-described configuration in which the footrest notch 40 is provided, the footrest 7 described in the above embodiment is further provided.
The configuration may be such that 0 is provided. In this case, the footrest 70
Is used to normally check the internal condition of the pipe mounting wall 1,
When performing the construction or repair work by checking the inside of the lower flow path 8 (upper flow path 15), the footrest notch 40 facilitates this. When inspecting the inside of the lower flow path 8 (upper flow path 15), the footrest 70 may be closed, and the footrest 70 does not hinder construction or repair work.

[0054]

According to the present invention, the inner surface of the pipe mounting wall is
A substantially conical inclined portion having a predetermined inclination angle, and a configuration formed by a hemispherical spherical wall portion at the center of the inclined portion, the water flow flowing into the inside can be collected on the spherical wall portion, and once. It is also possible to prevent the water flow collected on the spherical wall from splashing on the slope. At the same time, the inclined part has an angle of 45 degrees, which minimizes the resistance to the water flow flowing from the upstream straight pipe and prevents the turbulence of the water flow. Furthermore, the water flow on the surface of the inclined part quickly reaches the spherical wall part. It can be collected and discharged smoothly. Therefore, the upper flow path and the lower flow path can be set in any angle direction, and the installation angle and the number of pipes differing from site to site can be accommodated, and the construction can be simplified and the construction period can be shortened. Further, according to the configuration having the 45-degree inclined portion, the inflow head exceeds 600 mm, and even at a place where a sub-pipe usually needs to be provided, according to the present invention, the inflow is performed without providing the sub-pipe. The resistance to water flow can be minimized, the invert is not damaged, and materials and construction costs can be reduced. The pipe mounting wall must have a footrest installed to facilitate the inspection by people inside, but this footrest can be opened and closed freely on the inclined part so that it can be opened and closed only during inspection. It can be opened and used as a stepping stone for the inspector. Normally, since it is closed, dirt and the like can be prevented from adhering to the surface as much as possible. In addition, by embedding a plurality of fixing pieces in the inclined portion at predetermined intervals in advance, a footrest can be provided at an arbitrary position. This position can be provided at the position of any fixed piece according to the arrangement of the upper flow path and the lower flow path, so that the arbitrariness of the angle is not impaired. In addition, the operator can open and close the footrest only by kicking up with the foot when opening and closing with the rotating operation piece provided on the back surface of the footrest, thereby facilitating the inspection work.

Further, if the foot mounting notch in which the upper half portion of the lower flow path is cut out is provided on the pipe mounting wall having the inclined portion and the spherical wall portion, the operator puts his / her foot on it. Space can be secured, and the posture can be easily changed for construction and repair work. This makes it possible to easily perform a visual inspection of the inside of the lower flow path and the upper flow path, to accurately check the connection state with the straight pipe, and to perform the construction and repair work accurately and quickly.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a pipe mounting wall of the present invention.

FIG. 2 is a plan view of the pipe mounting wall.

FIG. 3 is a side sectional view showing another configuration example of the pipe mounting wall.

FIG. 4 is a plan view showing another configuration example of the pipe mounting wall.

FIG. 5 is a plan view showing another configuration example of the pipe mounting wall.

FIG. 6 is a side sectional view showing the installation state of the inspection footrest (FIG. 1
Figure in the direction orthogonal to.

FIG. 7 is a plan view showing the inspection footrest.

FIG. 8 is a perspective view showing an opened state of the inspection footrest.

FIG. 9 is a perspective view showing a closed state of the inspection footrest.

FIG. 10 is a side sectional view showing a pipe mounting wall provided with a notch for footrest.

FIG. 11 is a plan view showing a pipe mounting wall provided with the notch for placing the foot.

FIG. 12 is a plan view showing the arrangement of manholes.

FIG. 13 is a side sectional view showing the manhole.

FIG. 14 is a plan sectional view showing a pipe mounting wall at the bottom of a manhole.

[Explanation of symbols]

1 ... Pipe mounting wall, 2 ... Peripheral wall portion, 3 ... Inner side surface, 4 ... Vertical surface,
5 ... Inclined part, 6 ... Spherical wall part, 8 ... Lower flow path, 10 ... Downstream connection part, 11 ... Upstream connection part, 15 ... Upper flow path, 40 ... Foot rest notch part, 60a ... Upstream straight pipe, 60b ... Downstream straight pipe, 7
0 ... Foot rest, 71 ... Fixed piece, 77 ... Step, 79 ... Rotation operation piece.

Claims (4)

(57) [Claims] 1. A pipe mounting wall (1) forming a bottom portion of an assembly type manhole provided at a water flow connecting portion, wherein a predetermined step (D) is formed on each side of a peripheral wall portion (2) having a predetermined diameter. An upstream pipe (60a) and a downstream pipe (60b) which are connected to each other, and a slope for forming a water flow in the central portion, which is formed in the peripheral wall portion and has a substantially conical shape whose side cross section is inclined at a predetermined angle. Part (5), a spherical wall part (6) provided at the center of the inclined part and having a hemispherical side cross section, and the inclined part and the spherical wall part penetrating the peripheral wall part and from the downstream pipe. A lower flow path (8) formed to communicate with the lower flow path, and a lower flow path that is formed through the peripheral wall portion at a predetermined angle with respect to the lower flow path and communicates from the upstream pipe to the inclined portion and the spherical wall portion. And an upper channel (15) formed in the inclined portion, which can be opened and closed at the time of inspection. Footrest (7
0), and a pipe mounting wall with a footrest for inspection. 2. A fixing piece (71) is provided on the inclined portion (5).
Are embedded in advance at predetermined intervals, and the footrest (70) is fixed to the fixing piece (7
2) a base fixed to the base, a step (77) that can be freely opened and closed about a rotation axis (78) with respect to the base, The pipe mounting wall with a footrest for inspection according to claim 1, further comprising: a rotating operation piece (79) for holding the horizontal state of the step after opening and as an operation portion for opening. 3. The footrest (70) is attached to a predetermined fixing piece (71) according to an arrangement angle of the upper flow path and the lower flow path, or is configured to be detachable.
Pipe mounting wall with footrest for inspection as described. 4. A pipe mounting wall (1) forming the bottom of an assembly type manhole provided at a water flow connection part, wherein a predetermined step (D) is formed on each side of a peripheral wall (2) having a predetermined diameter. An upstream pipe (60a) and a downstream pipe (60b) which are connected to each other, and a slope for forming a water flow in the central portion, which is formed in the peripheral wall portion and has a substantially conical shape whose side cross section is inclined at a predetermined angle. Part (5), a spherical wall part (6) provided at the center of the inclined part and having a hemispherical side cross section, and the inclined part and the spherical wall part penetrating the peripheral wall part and from the downstream pipe. A lower flow path (8) formed to communicate with the lower flow path, and a lower flow path that is formed through the peripheral wall portion at a predetermined angle with respect to the lower flow path and communicates from the upstream pipe to the inclined portion and the spherical wall portion. An upper channel (15) formed in the lower channel, an inclined portion and a spherical wall in an upper half of the lower channel. And a notch (40) for a footrest having a shape cut off along the lower flow passage with a width of the diameter of the lower flow passage.