JPH0544634Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a manhole pipe connection structure that connects a manhole and pipes, and more specifically, a manhole that absorbs displacement of the connection part due to uneven subsidence of the ground, etc. Regarding piping connection structure.

[Prior Art] When connecting underground piping to a manhole, it is necessary to take into account the displacement of the piping due to uneven subsidence of the ground at the connection portion. Normally, flexible pipes are used for piping in this part, but the flexible pipes and manholes are rigidly connected via mortar, etc., and if uneven settlement occurs near the manhole and the ground displaces, for example, The flexible portion at the center of the flexible tube deforms to absorb deformations such as eccentricity, expansion/contraction, bending, and twisting that occur between both ends of the flexible tube.

For example, in the flexible pipe described in Japanese Utility Model Publication No. 59-22389, the rubber of the flexible part is vulcanized and bonded to a metal collar in advance, and the collar is embedded in a concrete pipe with anchor bolts. This ensures that the rubber is firmly connected to the concrete pipes on both sides.

In addition, as disclosed in Japanese Utility Model Application Publication No. 51-94019, the connecting part of the manhole and the piping are connected through an elastic body, and when the ground is displaced, the deformation of the elastic body absorbs the material. be.

[Problems to be Solved by the Invention] However, the former method, which uses flexible tubes, has many constituent members and has a complicated structure, which increases product costs and manufacturing equipment investment costs, which is undesirable. In addition, it is necessary to prepare materials separately from normal piping depending on the piping locations where there is a risk of uneven settlement, which is troublesome. Therefore, these flexible pipes have a flexible part in the pipe itself so that the uneven ground settlement can be absorbed by the deformation of the pipe itself, but if the connection between the manhole and the pipe can be connected elastically, the normal It is convenient because the piping can be used as is.

In addition, in the case of the latter, which connects the manhole connection part and the pipe through an elastic body, when connecting pipes with different diameters, it is necessary to use an elastic body corresponding to this, and the elastic body It is not possible to standardize the body, which increases costs.

This idea was devised in view of these actual circumstances, and allows for the absorption of ground displacement with a simple structure.In addition, it allows the use of normally used piping, makes it possible to share parts, and provides an accurate connection structure. The purpose is to provide a pipe connection structure for a certain manhole.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the manhole piping connection structure of this invention is such that the manhole connection ring is sandwiched between a concentric outer ring and an inner ring with a backup material sandwiched between them. Both sides are filled with an elastic sealant to form an integral structure, and mortar is provided between the outer ring of the manhole connecting ring and the piping connection part of the manhole, and mortar is provided between the inner ring and the piping. , characterized in that the piping connection portion of the manhole and the piping are connected.

[Function] In this design, a manhole connecting ring is arranged in which the manhole piping connection part and the piping are integrated, and they are connected through mortar. However, since adjustments can be made at the mortar part without using different manhole connection rings, it is possible to use a common manhole connection ring.

In addition, the integrated manhole connection ring is constructed by filling an elastic sealant on both sides with a back-up material sandwiched between a concentric outer ring and an inner ring. This prevents the center position of the inner ring from shifting, making it possible to accurately connect the piping connection part of the manhole to the piping.

In addition, the integrated manhole connection ring can be made of back-up material to widen the gap between the concentric outer ring and inner ring, making it possible to increase the elastic sealing material and prevent uneven ground subsidence. Therefore, when the position of the piping is displaced, the integrally constructed manhole connecting ring deforms to sufficiently absorb deformations such as eccentricity, expansion/contraction, bending, twisting, etc.

[Example] Next, an example of the manhole piping connection structure of this invention will be described in detail based on the accompanying drawings.

1 to 3 are diagrams showing a manhole pipe connection structure to which this invention is applied. The outer ring 2 and inner ring 3 constituting the manhole connection ring 1 are concentrically formed in an annular shape, and are manufactured by cutting steel pipes of different diameters into predetermined lengths, for example, and the outer ring 2 of both of these , the inner ring 3 is connected by room-temperature curing elastic sealing materials 4a and 4b as annular elastic bodies.

A predetermined gap D is secured between the outer ring 2 and the inner ring 3, so that the degree of freedom in deformation of the elastic sealing materials 4a and 4b connecting them is increased. A backup material 5 such as foamed polystyrene is loaded in the center so that the depth of the elastic sealing materials 4a and 4b is approximately the same as the gap D.

The manhole connecting ring 1 is manufactured by, for example, holding the outer ring 2 and the inner ring 3 concentrically and placing them on a horizontal stand, loading the backup material 5 at a predetermined position, and applying a primer (not shown). The top surface is filled with an elastic sealing material 4a, and after the elastic sealing material 4a has lost its tack, it is turned over and the other side is filled with an elastic sealing material 4b. Note that the backup material 5 is intentionally provided in order to reduce the depth of the elastic sealing materials 4a and 4b and to promote curing.

As the elastic sealing materials 4a and 4b, for example, a polyurethane type material that hardens at room temperature is used, and suitable primers for this are epoxy type, urethane type, acrylic type, etc. In addition, the elastic sealing materials 4a and 4b are preferably of a room temperature moisture curing type, but a room temperature oxygen curing type is also available, and a low modulus material is also available in order to minimize the stress during deformation and reduce the burden on the bonding surface. is preferred.

In this way, the elastic sealants 4a and 4b utilize their own strong adhesive force to seal the annular outer ring 2.
Since the inner ring 3 and the inner ring 3 are integrally formed by bonding each other, the structure is extremely simple.

This integrated manhole connection ring 1
When using this at the connection A between the manhole and the hump pipe, as shown in Figure 1, the manhole 6
A sleeve 6a with a predetermined diameter is provided in the sleeve 6a, and the manhole connecting ring 1 is inserted into the sleeve 6a.
A coating mortar 7 is filled into the gap between the outer ring 2 and the outer ring 2 and fixed. Then, one end 8a of the hume tube 8 is inserted into the inner ring 3, and the gap is similarly filled with coating mortar 7 and fixed. Then, the other end 8b of the fume pipe 8 is treated and buried in the ground 9.

Therefore, uneven subsidence of the ground 9 occurs at this connecting part A, and for example, as shown in FIG. When the manhole connecting ring 1 is displaced, the elastic sealing materials 4a and 4b are deformed via the outer ring 2 and the inner ring 3, thereby absorbing deformations such as eccentricity, expansion/contraction, bending, and twisting between the outer ring 2 and the inner ring 3. follow. This elastic sealing material 4
a and 4b are respectively attached to the outer ring 2 via a primer.
Since it is adhered to the inner ring 3, the adhesive force is strong and it will not peel off due to deformation.

In this way, the integrally constructed manhole connecting ring 1 is compact and not bulky, and can absorb ground displacement with a simple structure.Moreover, the manhole connecting ring 1, which is constructed as one piece, can absorb ground displacement with a simple structure. can be used. In addition, even if the diameter of the piping connection part of the manhole 6 and the diameter of the piping are different, there is no need to use a different manhole connection ring 1.
Since it can be adjusted at mortar 7,
The manhole connection ring 1 can be shared, reducing costs.

In addition, the manhole connecting ring 1 itself is compact and not bulky and is easy to transport. Furthermore, since it is composed of a steel pipe and an elastic sealing material, it is easy to manufacture and requires less investment in manufacturing equipment.

As the elastic sealing material 3, in addition to the embodiments, silicone-based, polysulfide-based, and other elastic sealing materials are suitable.

Further, the outer ring 2 and inner ring 3 used in the manhole connecting ring 1 are not limited to steel pipes, and may be made of other materials as long as they have good adhesion to elastic sealants and concrete.

[Effects of the invention] As explained above, this invention arranges a manhole connection ring that integrates the manhole piping connection and the piping, and connects them through mortar. Even if the diameters and pipe diameters are different, adjustments can be made at the mortar part without using different manhole connection rings, making it possible to use common manhole connection rings and significantly reducing costs.

In addition, the integrated manhole connection ring is constructed by filling elastic sealing material on both sides with a back-up material sandwiched between the concentric outer ring and inner ring. The center position of the inner ring is prevented from shifting, and the piping connection portion of the manhole and the piping can be accurately connected.

In addition, the integrated manhole connection ring can be used to widen the gap between the concentric outer ring and inner ring using back-up material, making it possible to increase the elastic sealing material, thereby preventing uneven ground settlement. When the position of the piping is displaced due to this, the integrally constructed manhole connecting ring deforms and can sufficiently absorb deformations such as eccentricity, expansion/contraction, bending, twisting, etc.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a manhole piping connection structure to which this invention is applied, FIG. 2 is a perspective view of a manhole connecting ring, and FIG. 3 is a sectional view showing a deformed state of the manhole connecting ring. In the figure, reference numeral 1 is a manhole connecting ring, 2 is an outer ring, 3 is an inner ring, 4a and 4b are elastic sealing materials, 6 is a manhole, 7 is a coating mortar, and 8 is a humid pipe.

Claims (1)

[Scope of utility model registration request] A manhole connecting ring is integrally constructed by filling an elastic sealant on both sides with a back-up material sandwiched between a concentric outer ring and an inner ring, and the outer ring of the manhole connecting ring and the manhole are connected to piping. A pipe connection structure for a manhole, characterized in that a mortar is provided between the inner ring and the pipe, and a mortar is provided between the inner ring and the pipe to connect the pipe connection part of the manhole to the pipe.