JP3788464B2 - Manhole connection - Google Patents

Description

  The present invention relates to a manhole connecting a sewer pipe laid in a home or the like, and more particularly to a manhole connection structure that is divided into a plurality of upper and lower stages and stacked.

  In recent years, manhole formation bodies to be embedded in the ground have been divided into a plurality of upper and lower stages and arranged by stacking in order to ensure ease of work during embedding and good transportability.

  As an example of the divided manhole forming body, Patent Document 1 discloses a precast manhole in which a plurality of manhole bodies are stacked in the vertical direction. In this precast manhole, the upper and lower manhole bodies are connected to each other by fitting a small diameter cylindrical portion and a large diameter cylindrical portion.

In such a case, as shown in FIG. 17, the upper and lower manhole bodies 50 and 51 are generally connected in a liquid-tight manner by crushing the seal member 52 by its own weight to ensure a water stop effect.
JP 2003-34940 A

  However, after the manhole main bodies 50 and 51 are buried in the ground, the upper manhole main body 50 is pushed by the dynamic load E or the earth pressure F of the vehicle traveling on the ground with long-term use, and the lower manhole main body 51 It may lean against. For this reason, the upper manhole body 50 is displaced with respect to the lower manhole body 51 due to a decrease in the connection strength, and a gap G is generated between the upper and lower manhole bodies 50, 51. There is a risk of water leakage such as intrusion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to reduce the number of connecting parts, to make the connection work safe and easy, and to connect the manhole body that is difficult to break. Is in the provision of.

The second object of the present invention is to absorb vibration applied to each cylindrical body (or each cylindrical body) to prevent the cylindrical body (or cylindrical body) from being damaged and to have excellent liquid-tightness at the connecting portion. To provide manhole connections.

(About claim 1)
The manhole connection body includes an upper cylindrical body having a lower arm portion provided with a bolt through hole in the lower portion, a lower cylindrical body provided with an upper arm portion embedded with a cylindrical nut in an upper portion, and an upper cylinder portion. Between the lower flat surface of the cylindrical body and the upper flat surface of the lower cylindrical body, the seal member for maintaining the liquid-tightness of the connecting portion, and the distal end portion of the female screw portion of the cylindrical nut A bolt to be screwed in, and an elastic washer, a metal washer, and a tightening nut that are fitted into a rear end portion of the bolt protruding from the bolt through hole when the cylindrical body is connected. It is a conical hole whose hole diameter increases toward.

(About claim 2 )
The manhole connector is composed of an upper cylindrical body having a lower arm portion provided with a bolt through-hole at the lower portion, a lower cylindrical body provided with an upper arm portion embedded with a cylindrical nut at an upper portion, and an upper cylindrical body. A tip is inserted between the lower flat surface and the upper flat surface of the lower cylindrical body, the seal member for maintaining the liquid-tightness of the connecting portion, and the female screw portion of the cylindrical nut. The bolt has an elastic washer, a metal washer, and a tightening nut that are fitted into the rear end of the bolt protruding from the bolt through hole when the cylindrical body is connected. It is a conical hole that grows.

(Claim 3 )
In addition to the structure of claim 1 or 2, the manhole connection body is made of rubber, and the inner peripheral side upper surface part in contact with the lower flat surface, the inner peripheral lower surface part in contact with the upper flat surface, or the inner part It is characterized in that the upper surface and the lower surface of the circumferential side are made of butyl rubber.

(About claim 4 )
In addition to the configuration of claim 3, the manhole connector has a plurality of ribs formed on the outer peripheral side lower surface portion of the seal member in contact with the upper flat surface and the outer peripheral side upper surface portion of the seal member in contact with the lower flat surface. Features.

(About claim 1)
The manhole connection body is provided with a lower arm part at the lower part of the upper cylindrical body located on the upper side, an upper arm part is provided on the upper part of the lower cylindrical body located on the lower side, and a sealing member is provided between the cylindrical bodies. The cylindrical bodies are connected to each other by inserting an elastic washer, a metal washer, and a tightening nut into the rear end of the bolt that protrudes from the bolt through hole and tightens the tightening nut.
When connecting, an L-shaped mounting plate, short / long bolts, and nuts are unnecessary, and the following advantages are obtained.
◎ The number of connecting parts can be reduced.
◎ Eliminates the trouble of attaching the mounting plate to each cylindrical body.
◎ Excellent safety because sharp protrusions are not exposed.
◎ Since there is no need to attach the nut part to the cylindrical body, the mechanical strength of the cylindrical body is improved.
◎ Since the cylindrical body is difficult to receive the load due to the tightening of the tightening nut, the occurrence of cracks can be prevented and the cylindrical body is not easily damaged.

The bolt through-hole drilled in the lower arm of the upper cylindrical body is a conical hole whose diameter increases from the upper side to the lower side. Therefore, even if the upper cylindrical body moves due to an earthquake, etc. Can absorb movement within the hole.
Further, during the following connecting operation, the bolt can easily penetrate the conical bolt through hole, and the operation can be performed smoothly.
A seal member is disposed on the upper flat surface of the lower cylindrical body, and the tip of the bolt is screwed into the female screw portion of the cylindrical nut embedded in the upper arm portion.
Then, from above the lower cylindrical body, the upper cylindrical body having the lower arm portion formed with the bolt through hole in the lower portion is lowered, and the bolt is passed through the bolt through hole.

(About claim 2)
The manhole connection body is provided with a lower arm part at the lower part of the upper cylindrical body located at the upper side, an upper arm part is provided at the upper part of the lower cylindrical body located at the lower side, and a seal member is interposed between the cylindrical bodies. The cylindrical bodies are connected to each other by fitting an elastic washer, a metal washer, and a tightening nut to the rear end of the bolt protruding from the bolt through hole, and tightening the tightening nut.
When connecting, an L-shaped mounting plate, short / long bolts, and nuts are unnecessary, and the following advantages are obtained.
◎ The number of connecting parts can be reduced.
◎ Eliminates the trouble of attaching the mounting plate to each cylinder.
◎ Excellent safety because sharp protrusions are not exposed.
◎ There is no need to attach a nut to the cylinder, so the mechanical strength of the cylinder is improved.
◎ Since the cylindrical body is difficult to receive the load due to the tightening of the tightening nut, the occurrence of cracks can be prevented and the cylindrical body is not easily damaged.

The bolt through-hole drilled in the lower arm of the upper cylindrical body is a conical hole whose diameter increases from the upper side to the lower side. Therefore, even if the upper cylindrical body moves due to an earthquake, etc. Can absorb movement within the hole.
Further, during the following connecting operation, the bolt can easily penetrate the conical bolt through hole, and the operation can be performed smoothly.
A seal member is disposed on the upper flat surface of the lower cylindrical body, and the tip of the bolt is screwed into the female screw portion of the cylindrical nut embedded in the upper arm portion.
Then, from above the lower cylindrical body, the upper cylindrical body having the lower arm portion formed with the bolt through hole in the lower portion is lowered, and the bolt is passed through the bolt through hole.

(Claim 3)
In order to ensure the liquid-tightness of the connecting part and to absorb the vibration applied to each cylindrical body (or each cylindrical body) and to prevent the cylindrical body (or cylindrical body) from being damaged, the sealing member is made of rubber. ing.
The inner peripheral upper surface of the sealing member that contacts the lower flat surface of the upper cylindrical body (or upper cylindrical body) or the inner surface of the sealing member that contacts the upper flat surface of the lower cylindrical body (or lower cylindrical body) If the circumferential lower surface portion is made of butyl rubber, the liquid tightness of the connecting portion can be sufficiently secured. Further, if the upper and lower surfaces of the seal member are made of butyl rubber, the liquid tightness of the connecting portion can be further ensured.

(About claim 4)
The manhole coupling body has a plurality of ribs formed on the outer peripheral side lower surface portion of the sealing member in contact with the upper flat surface of the cylindrical body (or cylindrical body) and on the outer peripheral side upper surface portion of the sealing member in contact with the lower flat surface. Therefore, the sealing performance can be further ensured.

The manhole coupling body includes a manhole cylinder portion provided with a lower arm portion provided with a bolt through hole at a lower portion, a manhole cylinder portion provided with an upper arm portion embedded with a cylindrical nut at an upper portion, and a manhole cylinder portion. A rubber seal member interposed between the lower flat surface of the cylindrical portion and the upper flat surface of the manhole cylindrical portion, and a bolt whose tip is screwed into the female screw portion of the embedded cylindrical nut And a rubber washer, a washer, and a tightening nut that are fitted into the rear end portion of the bolt protruding from the bolt through-hole when each cylindrical body portion is connected.

Thereby, the number of parts for connection can be reduced, a connection work can be performed safely and easily, and the manhole connection body which a connection part cannot easily be damaged can be provided.
[Reference Example 1]

1 to 5 show a reference example of the present invention.

  The manhole formation body 1 is, for example, a precast type, and is buried in the ground as shown in FIGS. 1 and 2 by laying work.

  The manhole forming body 1 is divided into a plurality of upper and lower (for example, three-stage) manhole cylinder portions 2, 3, and 4 in consideration of ease of work at the time of embedding and good transportability.

  The lowermost manhole cylinder part 4 is installed on a concrete base 5 as a pipe mounting wall constituting a bottom cylinder, and connects, for example, sewage pipes 6 and 7 receiving drainage from a household to the left and right.

  The middle manhole cylinder part 3 is connected by being stacked on the lowermost manhole cylinder part 4 as a true wall. The uppermost manhole cylinder part 2 is connected by being stacked on the middle manhole cylinder part 3 as an inclined wall.

  A protection cylinder portion 9a having an adjustment ring 8 and a porous metal lid 9 is attached to the uppermost manhole cylinder portion 2, so that the manhole formation body 1 has a stacked structure as shown in FIGS. It has become.

  The manhole cylinders 3 and 4 and the manhole cylinders 2 and 3 adjacent to each other in the manhole forming body 1 are provided with tightening mechanisms 10 on both the left and right sides. As shown in FIG. 4, the tightening mechanism 10 has a substantially L-shaped cross section that is fixed to the manhole cylinder portions 3 and 4 by a nut portion 11 embedded in the manhole cylinder portions 3 and 4 and a short bolt 12 as a screw means. The mounting plate 13 is provided. The horizontal piece 13b of the mounting plate 13 is formed with a passage hole 13A through which a long bolt 14 as a screwing member is inserted vertically, and the long bolt 14 is fastened to the washer nut 15 through the passage hole 13A. It has become. An annular groove 3 a is formed in the lower end opening of the manhole cylinder 3, and an annular recess 4 a corresponding to the groove 3 a is provided in the upper end opening of the manhole cylinder 4. Between the groove part 3a and the hollow part 4a, the sealing member 16 is arranged as an annular rubber packing having a predetermined thickness. A plurality of water blocking rib portions 16a are integrally formed on the upper and lower surface portions of the seal member 16 so as to be elastically deformable by pressing. Since the tightening mechanism 10 for the manhole cylinders 2 and 3 is the same as that used for the manhole cylinders 3 and 4, the tightening mechanism 10 for the manhole cylinders 2 and 3 is omitted in FIG.

  In the above-described configuration, the manhole cylinder parts 2, 3, 4, the adjustment ring 8 and the protection cylinder part as shown in FIG. 2 are provided in an excavation mine (not shown) provided by mining earth and sand at the site where the manhole formation body 1 is laid. 9a is installed in a stacked state. At the time of connecting the manhole cylinder parts 3 and 4, for example, using a wrench (not shown), the vertical piece 13a of the mounting plate 13 is fastened to the nut part 11 of the manhole cylinder parts 3 and 4 with the short bolt 12 and fixed. To do. Next, as shown in FIG. 5A, the long bolt 14 is inserted into the passage hole 13A of the mounting plate 13 and fastened to the washer nut 15 with a wrench. As a result, an axial tightening force is generated in the long bolt 14, and the middle manhole cylinder 3 is firmly brought into contact with the lowermost manhole cylinder 4 via the mounting plate 13, as shown in FIG. As shown in (b), the groove 3a press-deforms the seal member 16 to match the recess 4a and is connected in a liquid-tight manner. At this time, the water-stopping rib portion 16a of the seal member 16 constituting the rubber packing is elastically deformed by pressing and is tightly adhered to the groove portion 3a and the recess portion 4a to further improve the sealing effect against water leakage. Also during the connecting operation of the manhole cylinder portions 2 and 3, the manhole cylinder portions 2 and 3 are firmly connected by the same operation as the connecting operation of the manhole cylinder portions 3 and 4.

As described above, when the manhole forming body 1 is connected, the manhole cylinder portions 2, 3, and 4 can be quickly and liquid-tightly connected by a simple operation of simply tightening the long bolt 14 to the mounting plate 13 at the laying site. it can. Unlike the conventional configuration in which the manhole cylindrical portions 2, 3, and 4 are connected by their own weight, the manhole cylindrical portions 2 and 3 are firmly restrained by the long bolts 14 and do not cause a positional deviation in the radial direction and the axial direction and maintain a good water stop effect. For this reason, even in a harsh environment that receives a dynamic load or uneven earth pressure of a vehicle traveling on the ground, there is no risk of a water leakage phenomenon due to a decrease in the connection strength of the manhole cylinders 2, 3 and 4, The good connection state of the manhole cylinder parts 2, 3, 4 can be maintained over a long period of time.
[Reference Example 2]

FIG. 6 shows Reference Example 2 of the present invention.

In the reference example 2, the mounting plate 13 of the tightening mechanism 10 is provided on the manhole forming body 1 in the front and rear as well as the front and rear, and is installed in a total of four locations.

Thereby, the position shift of the manhole cylinder parts 2, 3, and 4 can be prevented, and the connection can be further strengthened.
[Reference Example 3]

FIG. 7 shows Reference Example 3 of the present invention.

The reference example 3 is different from the reference example 1 in that a long gutter nut 18 is screwed into the male screw portion 14 a located between the attachment plates 13 of the long bolt 14.

  For this reason, when the connection of the manhole cylinders 2, 3, 4 is completed, the flange nut 18 functions as a spacer positioned between the mounting plates 13, and prevents excessive tightening of the long bolt 14.

Further, by tightening the washer nut 15 against the heel nut 18, a double nut effect is generated, and inadvertent loosening of the washer nut 15 can be prevented.
[Reference Example 4]

FIG. 8 shows Reference Example 4 of the present invention.

Reference example 4 differs from the Reference Example 1, by a vertical piece portion 13a of the mounting plate 13 to omit the nut portion 11 and short bolts 12 of Reference Example 1 was fixed by embedding in the manhole cylindrical body portion 3, 4 is there. The nut portion 11 of Reference Example 1 is not necessary, and the number of parts is reduced, which is advantageous in terms of cost.
[Reference Example 5]

FIG. 9 shows Reference Example 5 (corresponding to claims 1 , 3 , 5, 6, and 7) of the present invention.

Reference Example 5 differs from the reference example 1, the nut portion 11 of the reference example 1, omitting the short bolts 12 and the mounting plate 13, integrally to extend form the arm portion 19 to the manhole cylindrical body portion 3, 4 ing. The upper and lower arm portions 19 correspond to the mounting plate 13 of Reference Example 1, and are provided with through holes 20 that are directed substantially in the horizontal direction and allow the long bolts 14 to pass up and down. In this configuration, the number of parts can be reduced by integral molding of the arm portion 19, which simplifies the structure and is advantageous in terms of cost. In this case, since the arm portion 19 is in a cantilever state, a large amount of reinforcing material such as a reinforcing bar may be embedded in the arm portion 19.
[Reference Example 6]

FIG. 10 shows Reference Example 6 of the present invention.

In Reference Example 6, the mounting plate 13 of the tightening mechanism 10 is installed on the manhole forming body 1 at a total of three locations at an equal angular interval of 120 degrees.

Thereby, similarly to the reference example 2, it is possible to prevent the displacement of the manhole cylinder parts 2, 3, and 4 and to further strengthen the connection.

In addition, about the attachment position and the number of the tightening mechanisms 10, it can change as desired according to a use condition or the environment of a digging site.
[Reference Example 7]

FIG. 11 shows Reference Example 7 of the present invention.

The reference example 7 differs from the reference example 1 in that an elastic packing 22 is provided between the vertical piece portion 13 a of the mounting plate 13 and the manhole cylinder portions 3 and 4.

For this reason, even if the middle manhole cylinder portion 3 is pushed by an impact such as a dynamic load or an earth pressure of a vehicle traveling on the ground, the impact is satisfactorily mitigated by the elastic packing 22, and the middle manhole cylinder. The connection strength between the part 3 and the lowermost manhole cylinder part 4 does not decrease, and a good water stop effect can be maintained.
[Reference Example 8]

FIG. 12 shows Reference Example 8 of the present invention.

The reference example 8 differs from the reference example 1 in that the elastic packing 22 similar to the reference example 7 is provided between the mounting plate 13, the long bolt 14, the short bolt 12, the washer nut 15, and the manhole cylinder parts 3 and 4. Is arranged in a multifaceted manner.

  That is, not only between the vertical piece portion 13a and the manhole cylinder portions 3 and 4, but also between the vertical piece portion 13a and the short bolt 12, between the horizontal piece portion 13b and the long bolt 14, and the horizontal piece portion 13b and the washer. Various elastic packings 22 are arranged between the nut 15 and the nut 15.

In the reference example 8, the impact absorbing performance is dramatically improved by the elastic packing 22 arranged in a multifaceted manner, and the impact caused by the dynamic load or the earth pressure of the vehicle traveling on the ground is greatly reduced, and the connection strength is improved. A good water-stopping effect can be sustained over a long period of time without causing a drop.

The elastic packing 22 used in the preceding Reference Example 7 and Reference Example 8 can be applied equally to Reference Example 6 to no Reference Example 2.
(Modification of Reference Examples 1-8)
The manhole cylinder parts 2, 3, and 4 in the reference example are not limited to three stages, and can be stacked as desired, such as four or five stages, depending on the depth of the underground.

  Instead of the washer nut 15, a nut portion for screwing the long bolt 14 may be provided on the mounting plate 13 by direct threading.

  Further, the mounting plate 13 and the arm portion 19 may be formed to have a substantially T-shaped cross section so as to give strength against bending, and may be made to resist a bending moment generated by tightening the long bolt 14.

  The seal member 16 is not only made of rubber packing but also elastically deformed by the tightening force of the long bolt 14 using an annular elastic ring having a predetermined thickness, so that the manhole cylinder parts 2, 3, 4 You may make it ensure adhesiveness.

  In addition, in concrete implementation of this invention, it can change variously in the range which does not deviate from the summary of invention, such as being applicable not only to the waste_water | drain from a household but agricultural water, industrial water, or industrial wastewater.

Next, Example 1 (corresponding to claims 1 to 4 ) of the present invention will be described with reference to FIGS.

  The manhole connector A embedded in the ground by the laying work includes cylindrical manhole cylinder parts 2 and 3 and a bottomed cylindrical manhole cylinder part 4 in consideration of transportability and workability at the time of embedment. Are connected in the vertical direction.

  When connecting the lower manhole cylinder 4 and the middle manhole cylinder 3, the manhole cylinder 4 corresponds to the lower cylinder, and the manhole cylinder 3 corresponds to the upper cylinder. To do. Further, when connecting the middle manhole cylinder 3 and the upper manhole cylinder 2, the manhole cylinder 3 corresponds to the lower cylinder, and the manhole cylinder 2 corresponds to the upper cylinder. To do.

  The manhole cylinder 4 (made of concrete) is installed on a concrete base 5 and connects sewage pipes 6 and 7 through which sewage (sewage and drainage) flows.

  The manhole cylinder part 4 integrally forms three upper arm parts 41 (120 ° intervals) extending outward from the upper part of the cylinder. And the cylindrical nut 42 is embedded in the constrained state in the recessed part 40 of the upper arm part 41 (refer FIG. 14, FIG. 15). In addition, the upper arm part 41 may be two (opposing arrangement).

  Further, when the diameter of the manhole cylinder is large, or when it is necessary to firmly tighten the cylinders, the upper arm 41 has a large number of four, five, six, seven, eight, etc. Do (equal intervals).

  Note that the number of lower arm portions 31 described later is the same as the number of upper arm portions 41.

  The manhole cylinder part 3 (made of concrete) integrally forms three lower arm parts 31 (at intervals of 120 °) extending outward from the lower part of the cylinder.

  The lower arm portion 31 is provided with a conical bolt through-hole 32 whose diameter increases from the top to the bottom (see FIG. 15).

  Moreover, the manhole cylinder part 3 integrally forms three upper arm parts 33 (120 ° intervals) extending outward from the upper part of the cylinder. A cylindrical nut 34 is embedded in the upper arm portion 33 in a restrained state.

  Similarly to the first embodiment, a protective cylinder portion 9 a having an adjustment ring 8 and a metal lid 9 is attached to the uppermost manhole cylinder portion 2 (made of concrete).

  The manhole cylinder portion 2 integrally forms three lower arm portions 21 (120 ° intervals) extending outward from the lower portion of the cylinder.

  The lower arm portion 21 is formed with a conical bolt through-hole 23 whose hole diameter increases from the upper side to the lower side.

  Reference numeral 43 denotes a bolt whose tip is screwed into the female thread 44 of the cylindrical nut 42.

  A rubber washer 45 (elastic washer), a washer 46 (metal washer), and a tightening nut 47 are fitted into the rear end portion of the bolt 43 protruding from the bolt through hole 32.

  The connection between the manhole cylinder 2 and the manhole cylinder 3 is the same. The front end of the bolt is screwed into the female threaded portion of the cylindrical nut 34, and a rubber washer (elastic washer), a washer (metal washer), and a tightener are attached to the rear end of the bolt protruding from the bolt through hole 22. A nut is fitted.

  Reference numeral 60 denotes a ring-shaped seal member (made of rubber), which is interposed between the lower flat surface 35 of the manhole cylinder portion 3 and the upper flat surface 48 of the manhole cylinder portion 4.

  In this sealing member 60, the inner peripheral side upper surface part in contact with the lower flat surface 35 and the inner peripheral side lower surface part in contact with the upper flat surface 48 are both formed of butyl rubber 61. Further, a plurality of ribs 62 are formed on the outer peripheral side lower surface portion of the seal member 60 in contact with the upper flat surface 48 and the outer peripheral side upper surface portion of the seal member 60 in contact with the lower flat surface 35.

  FIG. 15 shows the state of the seal member 60 before the tightening nut 47 is tightened.

The manhole cylinder part 3 and the manhole cylinder part 4 of the manhole connector A are connected by the following procedure. The connection between the manhole cylinder 2 and the manhole cylinder 3 is the same.
[1] As shown in FIG. 14, a seal member 60 is disposed on the upper flat surface 48 of the manhole cylinder 4, and the tip of the bolt 43 is fitted to the female thread 44 of the cylindrical nut 42 embedded in the upper arm 41. Screw in.
[2] Maintaining the positional relationship where the bolt 43 comes below the bolt through hole 32 of the lower arm 31, the manhole cylinder 3 is lowered from above the manhole cylinder 4, and the bolt through hole 32. Bolts 43 are passed through. At this time, the bolt through-hole 32 is a conical hole whose diameter increases from the upper side to the lower side, so that the bolt 43 easily passes through the bolt through-hole 32.
[3] A rubber washer 45, a washer 46, and a tightening nut 47 are fitted into the rear end portion of the bolt 43 protruding from the bolt through hole 32.

  Then, the tightening nut 47 is tightened, and the manhole cylinder part 4 and the manhole cylinder part 3 are connected in a liquid-tight manner.

Manhole connecting body A of this embodiment, upon coupling, Reference Example 1 Reference Example 8 L-shaped mounting plate 13 was required, the short bolts 12, the long bolt 14, the nut portion 11 is unnecessarily Thus, the following advantages arise.
◎ The number of connecting parts can be reduced.
◎ Since there is no need to attach the mounting plate 13 to the manhole cylinders 2, 3, and 4, it does not take time.
◎ Excellent safety because sharp projections such as L-shaped mounting plate 13 are not exposed.
-Since it is not necessary to attach the nut part 11 to the manhole cylinder parts 2, 3, and 4, the mechanical strength of the manhole cylinder parts 2, 3, and 4 improves.
◎ Since the manhole cylinder parts 2, 3 and 4 are difficult to receive a load due to the tightening of the tightening nut 47, the generation of cracks can be prevented and the manhole cylinder parts 2, 3 and 4 are hardly damaged. In addition, in the case of the connection method of Reference Example 1 to Reference Example 8, since a point load is applied to the mounting screw, a crack prevention measure is taken to prevent cracks from entering the connecting portions of the manhole cylinder parts 2, 3, and 4. It is necessary to apply.
The bolt through hole 32 is a conical hole whose diameter increases from the top to the bottom.

  For this reason, even if the manhole cylinder part 3 moves due to an earthquake or the like, the movement can be absorbed within the range of the conical bolt through hole 32.

Further, when the manhole cylinder part 3 is lowered from above the manhole cylinder part 4 and the bolt 43 is passed through the bolt through hole 32, the bolt 43 easily penetrates the bolt through hole 32. Can be done smoothly.
The seal member 60 interposed between the lower flat surface 35 of the manhole cylinder 3 and the upper flat surface 48 of the manhole cylinder 4 has both the inner peripheral upper surface and the inner peripheral lower surface. A plurality of ribs 62 are formed on the outer peripheral side upper surface part and the outer peripheral side lower surface part.

The liquid-tightness of the connecting portion and the vibration applied to the manhole cylinder parts 3 and 4 can be absorbed, and the manhole cylinder parts 3 and 4 can be prevented from being damaged.
(Modification of Example 1)
In the seal member 60 used in the manhole connector shown in FIG. 16, the inner peripheral side upper surface part in contact with the lower flat surface 35 and the inner peripheral side lower surface part in contact with the upper flat surface 48 are both formed of butyl rubber 61.

  However, a plurality of ribs 62 are not formed on the outer peripheral side lower surface portion of the seal member 60 in contact with the upper flat surface 48 and the outer peripheral side upper surface portion of the seal member 60 in contact with the lower flat surface 35.

  FIG. 16 shows the state of the seal member 60 before the tightening nut 47 is tightened.

  This manhole connection body has the same advantages as the manhole connection body A.

It is a disassembled perspective view of a manhole cylinder part ( reference example 1). It is a perspective view which shows a manhole formation body ( reference example 1). It is a top view which shows a manhole formation body ( reference example 1). It is a longitudinal cross-sectional view which shows a fastening mechanism with a manhole cylinder part ( reference example 1).

It is a longitudinal cross-sectional view of the fastening mechanism shown in order to demonstrate an effect | action ( reference example 1). It is a top view which shows a manhole formation body ( reference example 2). It is a longitudinal cross-sectional view which shows a fastening mechanism with a manhole cylinder part ( reference example 3).

It is a longitudinal cross-sectional view which shows a fastening mechanism with a manhole cylinder part ( reference example 4). It is a longitudinal cross-sectional view which shows a fastening mechanism with a manhole cylinder part ( reference example 5). It is a top view which shows a manhole formation body ( reference example 6). It is a longitudinal cross-sectional view which shows a fastening mechanism with a manhole cylinder part ( reference example 7). It is a longitudinal cross-sectional view which shows a fastening mechanism with a manhole cylinder part ( reference example 8). A swash view showing the manhole connecting body (Example 1). It is a main partial solution oblique view of a manhole connecting body (Example 1). It is principal part sectional drawing of a manhole coupling body (Example 1 ). It is principal part sectional drawing of a manhole coupling body (modified example of Example 1 ). It is a longitudinal cross-sectional view which shows the connection structure of the conventional manhole main bodies.

Explanation of symbols

2 manhole cylinder (upper cylinder, upper cylinder)
3 Manhole cylinder (upper cylinder, upper cylinder, lower cylinder, lower cylinder)
4 Manhole cylinder (lower cylinder, lower cylinder)
31 Lower arm portion 32 Bolt through hole 35 Lower flat surface 41 Upper arm portion 42 Cylindrical nut 43 Bolt 44 Female thread portion 45 Rubber washer (elastic washer)
46 washer (metal washer)
47 Tightening nut 48 Upper flat surface 60 Seal member 61 Butyl rubber 62 Rib

Claims (4)

An upper cylindrical body provided with a lower arm part formed with a bolt through-hole at the lower part;
A lower cylindrical body with an upper arm embedded with a cylindrical nut at the top;
A seal member interposed between the lower flat surface of the upper cylindrical body and the upper flat surface of the lower cylindrical body to maintain the liquid-tightness of the connecting portion;
A bolt whose tip is screwed into the female thread of the cylindrical nut;
A manhole coupling body comprising an elastic washer, a metal washer, and a tightening nut that are fitted into a bolt rear end protruding from the bolt through-hole when the cylindrical body is coupled, The bolt through hole is a conical hole whose hole diameter increases from the top to the bottom. An upper cylindrical body having a lower arm portion provided with a bolt through-hole at the bottom;
A lower cylindrical body with an upper arm embedded with a cylindrical nut at the top;
A seal member interposed between the lower flat surface of the upper cylindrical body and the upper flat surface of the lower cylindrical body to maintain the liquid-tightness of the connecting portion;
A bolt whose tip is screwed into the female thread of the cylindrical nut;
A manhole coupling body comprising an elastic washer, a metal washer, and a tightening nut fitted into a bolt rear end protruding from the bolt through-hole when coupling a cylindrical body, The bolt through hole is a conical hole whose hole diameter increases from the top to the bottom. The sealing member is made of rubber, and is characterized in that an inner peripheral side upper surface part in contact with the lower flat surface, an inner peripheral lower surface part in contact with the upper flat surface, or an inner peripheral side upper and lower surface part is made of butyl rubber. The manhole coupling body according to claim 1 or 2, wherein: 4. The rib according to claim 3, wherein a plurality of ribs are formed on an outer peripheral side lower surface portion of the seal member in contact with the upper flat surface and an outer peripheral side upper surface portion of the seal member in contact with the lower flat surface. Manhole connection.

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