JP2889563B1 - Construction manhole construction method - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To attach a ring-shaped precast concrete member with an adhesive when constructing an assembling manhole, the construction method is easy to perform, does not cause cracks and the like, and is extremely excellent. When adjustment is required, a great deal of labor is required to separate the members at the joint. SOLUTION: Fats and oils, powders,
After applying peeling means such as a permeable thin layer sheet, a perforated film, a woven fabric, a nonwoven fabric, and a net, the assembly is performed with an open cell sponge impregnated with an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for constructing an assembling manhole.

[0002]

2. Description of the Related Art An assembling manhole is assembled and buried on site by appropriately combining precast concrete ring-shaped members such as a pipe mounting wall, a straight wall, an inclined wall, and an adjusting ring on a bottom plate. Such a bottom plate and a ring-shaped member are mass-produced in a factory under strict quality control. The connection of these members in the field includes one in which the ring-shaped members are directly joined by bolts, one in which the connection plate is bolted to the side surface of the members, and one in which the connection plate is adhesively joined with a resin adhesive.

FIG. 3 shows an example of bolt connection. The insert 23 is embedded in the lower member 21, the recess 26 is provided on the inner surface side of the upper member 22, the embedded washer 25 is attached, and the bolt 24 is tightened from inside the manhole to join the upper and lower members. FIG. 4 shows the bolt 33 connected to the upper and lower members 21 and 22.
Are screwed into inserts 32 provided in each of the above and are vertically joined by a connecting plate 31.

In the joining by bolts and the joining by using a connecting plate, rubber packings 27 and 34 are inserted into the joining surfaces, respectively, to secure the waterproofness. However, in such a joint, when pressure acts on the manhole from above, for example, when a vehicle passes directly above the manhole, the joining surface of the members is not necessarily flat, so that a part of the joining surface The load was concentrated on the portion, cracks occurred, and in some cases, the ring-shaped member was broken.

[0005] On the other hand, in the case of bonding with a resin adhesive, the resin also spreads to the non-contact portion of the joining surface, and the solidification of the resin causes the adjacent members to be integrated with each other, dispersing the load, and thus breaking concrete. And a manhole excellent in strength can be constructed.

[0006]

As described above, the method of bonding with an adhesive is easy to carry out, and is excellent without causing cracks or the like. When it is necessary to adjust the height of
Great effort is required to separate the members at the joint.

SUMMARY OF THE INVENTION An object of the present invention is to develop and provide a method for constructing an assembling manhole which solves such problems.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its technical means is to construct a ring-shaped member made of precast concrete by stacking and assembling a manhole. A method for constructing an assembling manhole, characterized in that, after a joining surface peeling means is provided at a joining portion between shaped members, an assembling is performed by interposing an open-cell sponge impregnated with an adhesive. The bonding surface provided with the bonding surface separating means may be a surface that is likely to require manhole height adjustment in the future. For example, it may be applied to the upper end surface of the three ring members at the top of the assembly manhole. The peeling means weakens the bonding force of the bonding surface and, for example, when the wedge or the like is driven into the bonding portion of the ring-shaped member, the bonding surface is peeled.

[0009] The application of the peeling means may be, for example, a thin layer application of fat or oil, a sticking of a permeable thin layer sheet, an interposition of a perforated film, a sticking of a woven or nonwoven fabric, and a metal. Alternatively, it can be effectively achieved by any means selected from the laying of non-metallic nets. Above all, a means for applying a thin oil or fat, for example, a means for applying a thin grease, is a simple means, which can obtain an appropriate adhesive force, maintains watertightness during use of a manhole, and moves due to earth pressure or the like. It is preferable to appropriately resist and peel off the film, because the film is clearly separated by an appropriate peeling force.

As another means, a similar effect can be obtained by applying a thin layer of powder, and a permeable thin layer sheet, for example, Japanese paper, natural fiber sheet, woven or non-woven fabric, etc. It may be attached to all or a part of the adhesive surface. A sheet having a large number of appropriate holes may be interposed in a resin film such as a polyethylene film, and the magnitude of the adhesive force can be adjusted by adjusting the ratio of the opening area of the holes or the area ratio of the film. By laying a metal or non-metal net, it is possible to adjust the effective bonding area and to form a separation surface for peeling.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a method of constructing an assembling manhole according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing an entire assembling of the manhole. As shown in FIG. 2, a pipe mounting wall 2 for mounting an inflow pipe and a connecting pipe 7 is placed on a bottom plate 1, and a straight wall 3, an inclined wall 4, an adjusting ring 5, and the like are sequentially stacked on the pipe mounting wall 2. A lid 6 is provided at the top end. 8
Is a step.

As shown in FIG. 1, the joint between the vertically adjacent ring-shaped concrete members 3 and 4 is a tenon joint having a groove 11 and a ridge 12 facing the groove.
In the present invention, the inner surface of the concave groove 11 is assembled by interposing a continuous cell sponge material 14 impregnated with a resin adhesive by applying a separating means. The open-cell sponge material 14 impregnated with the resin adhesive is compressed in the concave groove 11 to firmly adhere the upper and lower members 3 and 4. It is intended to be peeled off at that time.

That is, it is necessary to adjust the height of the manhole at a later date, and when the sloping wall 4 is to be removed, the sloping wall 4 has conventionally been joined with a strong adhesive force, and a great deal of labor has been spent.
Had been destroyed. According to the method of the present invention, concrete parts which are expected to be separated in the future are bonded, for example, when the slope wall 4 is to be separated, a thin grease 13 is applied in the groove 11 of the straight wall 3 and then the resin is bonded. The slope wall 4 is installed with the sponge material 14 impregnated with the agent interposed therebetween. The grease may be for commercially available machines. That is, an oil film is formed on the concrete surface to reduce the adhesive strength of the adhesive. When separating the inclined wall 4 later, it can be easily separated by driving a wedge into the joint surface. The grease 13 can be easily applied thinly, can obtain an appropriate adhesive force, and can be easily peeled. The other means described above may be used instead of the grease 13.

According to the present invention, the resin does not concentrate on a part of the resin evenly with respect to the compressive load in the axial direction since the resin is uniformly solidified. In addition, it is possible to sufficiently cope with a lateral load by cooperating the tenon shape and the adhesive force without any problem. Then, when it becomes necessary to adjust the height, the adjustment can be performed quickly without breaking the ring-shaped concrete member.

[0015]

The construction method of the assembly manhole according to the present invention is configured as described above, so that the strength against the load from above, the uniformity of the stress distribution, the partial destruction due to the stress concentration, and the sufficient adhesive strength are obtained. The conventional advantages such as high watertightness, low laying time and efficient construction can be maintained, and it can be easily separated at a later date if separation work such as height adjustment is required. It is possible to respond quickly to short days, and the contribution is extremely large.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a joint between upper and lower members showing a construction method according to an embodiment.

FIG. 2 is an overall vertical sectional view of an assembly manhole according to the embodiment.

FIG. 3 is a diagram showing the upper and lower joints of a conventional assembly manhole.

FIG. 4 is a view showing the upper and lower joints of a conventional assembly manhole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom plate 2 Pipe mounting wall 3 Straight wall 4 Sloping wall 5 Adjusting ring 6 Lid 7 Connecting pipe 8 Step 11 Concave groove 12 Convex stripe 13 Grease 14 Sponge 21 Lower side 22 Upper side 23 Insert 24 Bolt 25 Embedded washer 26 Concave 27 Packing 31 Connecting plate 32 Insert 33 Bolt 34 Packing

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-167280 (JP, A) JP-A-7-207689 (JP, A) JP-A-8-41917 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) E02D 29/12

Claims (2)

(57) [Claims] 1. An assembly manhole for stacking and assembling precast concrete ring members,
A method for constructing an assembling manhole, comprising: providing a joining surface separating means to a joining portion between ring-shaped members; and assembling the assembly by interposing a continuous-cell sponge impregnated with an adhesive. 2. The method of applying the peeling means includes applying a thin layer of oil or fat, sticking a permeable thin sheet, interposing a perforated film, sticking a woven or nonwoven fabric, and applying a metal or non-metal. 2. The method according to claim 1, wherein the method is selected from laying a net.