JP2680555B2 - How to adjust the height of the top surface of the existing manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top surface height adjusting method for an existing manhole.

[0002]

2. Description of the Related Art Manholes are installed everywhere for maintenance and management of pipe networks for water and sewage, drainage, and ducts for electric power, communications, etc. , Provided under the road. For existing manholes, so-called maintenance is required to adjust the height of the top surface due to factors such as road surface wear, ground subsidence, ground movement, and earthquakes. In such a manhole, a cylindrical precast concrete member is assembled and buried in the ground, and a receiving frame is placed on it to form a part of the road surface. The receiving frame is designed to drop the lid.

The upper surface of the receiving frame and lid of this manhole must have the same top height as the road surface. All the precast concrete parts manufactured in the factory are standardized. On the other hand, the site conditions of the installation position vary widely, and the road surface is always inclined to either side, so not only when installing a new manhole but also when adjusting the height of the top surface of the existing manhole. However, it is necessary to finely adjust the height of the top surface according to this inclination.

Japanese Unexamined Patent Publication No. 2-252524 discloses a technique for adjusting the height of the top surface of a manhole using a coil spring. With this technique, the top surface height can be adjusted as desired by the tightening of the nut, a large adjustment allowance can be taken, and fine adjustment can be performed steplessly. Therefore, the height of the top surface of the receiving frame can be easily and accurately constructed in a short time according to the actual situation at the site.

As a technique for further improving the technique disclosed in Japanese Patent Laid-Open No. 2-252524, a method for adjusting the height of the top surface of a manhole is provided in Japanese Patent Laid-Open No. 6-228981. The content of this is to use the technology to arrange the coil spring on the lower surface of the receiving frame and tighten the nut of the receiving frame mounting bolt to adjust the top surface height of the upper surface of the receiving frame. Is a technique in which a flexible cylindrical buried inner frame that bends following the bottom surface of the receiving frame is provided and cement mortar having high fluidity is injected into the space below the receiving frame.

On the other hand, Japanese Examined Patent Publication No. 61-33938 discloses a pavement method around a manhole when adjusting the top surface of an existing manhole. The paved road surface around the manhole is cut into a circular shape and the manhole and It is described that the pavement plate attached to it is integrally removed. This technique can be applied only to a manhole of a type in which the manhole and the paving slab can be removed as they are. That is, the target of this technique is limited to the manhole of the type in which the receiving frame of the upper lid of the manhole is simply fitted into the manhole body from above.

[0007]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 61-3393
The technique disclosed in Japanese Patent Publication No. 8 can be applied only to a manhole of a type in which the manhole and the paving slab can be removed as a unit. Further, with such a technique, it is not easy to finely adjust the height of the top surface of the upper surface of the manhole with respect to the mismatched inclination of the road surface.

The present invention provides a method for adjusting the height of the top surface of an existing manhole capable of precisely adjusting the height of the top surface of an existing manhole regardless of the type of the manhole and the surrounding conditions. The purpose is to provide, and the technique described in the above-mentioned JP-A-6-228981 is applied.

[0009]

According to the present invention, when adjusting the height of the top surface of an existing manhole, the pavement portion around the manhole is circularly cut to cut an edge with the pavement plate, and then the pavement portion is destroyed and removed. , Remove the receiving frame mounting bolt and pull up the receiving frame
Remove the receiving frame of Gaité manhole cover, to adjust the adjusting ring, then the flexible cylindrical filling killing frame and coil springs disposed on the adjusting ring, the receiving frame mounting bolts place the receiving frame thereon This is a method for adjusting the height of the top surface of an existing manhole, which is characterized by adjusting nuts to match the height of the upper surface of the receiving frame with the road surface, injecting cement mortar into the space under the receiving frame, and then paving the periphery of the receiving frame.

In the above method, adjustment of the pre-Symbol adjusting ring, removal of existing adjusting ring, replacement, re-use, and shall be the one or more means of additional means new adjustment ring.

[0011]

In the method for adjusting the height of the top surface of the existing manhole of the present invention, an arbitrary top surface height can be set by tightening the coil spring with a nut.
It can be adjusted steplessly according to the actual road surface.
Further, even if there is an error in a member or the like, since it is not affected by this error at all, the top surface height can be adjusted easily and accurately.

Since the cement mortar having high fluidity is injected into the space between the top surface height adjusting ring and the receiving frame, the mortar spreads to every corner of this space and no gap is generated. The flexible cylindrical inner frame has a thick lower end portion that is seated on the adjustment ring and an upper edge that bends following the bottom surface of the receiving frame,
By adjusting the height of the top surface of the receiving frame, it comes into close contact with the lower surface of the receiving frame. The receiving frame may be inclined, the inner side of the receiving frame is completely sealed and the airtightness is high, and the leakage of paste does not occur. In addition, since it is buried, mortar finishing etc. is not necessary, and mortar lumps will not fall inside the manhole in the future.

Since such an inner frame is provided, mortar having high fluidity can be densely filled. Since quick-hardening mortar can be quickly injected and the work can be completed, it is easy to shorten the construction time and save labor. If the outer frame is also a flexible cylinder that fits over the outer diameter of the adjustment ring and the receiving frame, and the mortar injection port is inserted into a part of this cylinder, workability, sealing performance will be excellent, and labor will be saved. Therefore, it is preferable.

[0014]

EXAMPLE FIG. 4 is a vertical sectional view showing an example of a manhole. A manhole body 1 is embedded in the ground, and an adjustment ring 2, a lid 5, and a receiving frame 4 of the lid 5 are attached to the upper end of the body. The receiving frame 4 is usually fixed by a bolt 8 screwed into an insert 6 provided on the frame 1 or the adjustment ring 2. The top surface of the manhole, that is, the top surface of the receiving frame 4 and the top surface of the lid 5 are installed at the same height as the road surface of the road. The top surface of such a manhole does not coincide with the road surface of the road due to ground subsidence of the road, ground movement, an earthquake, etc., and thus a height difference occurs. In such a case,
Requires top adjustment.

1 and 2 are explanatory views showing a method for adjusting the height of the top surface of an existing manhole according to the embodiment. This will be described below according to the working steps of the embodiment. a) Since the subsidence 22 is generated on the pavement plate 21 around the existing manhole, it is necessary to adjust the top surface of the manhole. A pavement portion 24 around the manhole receiving frame 4 is cut with a pavement plate 21 and a cutting line 23. For example, it cuts using a circular cutter. b) Next, the cut pavement portion 24 is destroyed and removed. c) Remove the nut 9 of the bolt 8 fixing the receiving frame 4 and remove the receiving frame 4. In this case, in the manhole of the type in which the receiving frame 4 is fitted into the manhole body 1,
Of course, it is not necessary to remove the bolts and nuts. d) Next, adjust the adjusting ring 2. The adjustment ring 2
It is installed when the manhole is installed to adjust the height of the top surface of the manhole, and multiple adjustment rings are inserted so that the adjustment ring with an appropriate thickness can be pulled out when the ground subsides. Is normal. Therefore, the adjustment ring can be adjusted by removing the existing adjustment ring or replacing the adjustment ring when the ground around the manhole subsides, and reusing it when it is not necessary.When the ground around the manhole rises. Is to add a new adjustment ring. When adjusting the adjusting ring, the existing filler such as mortar 10 is naturally removed. e) Next, the cylindrical rubber inner frame 3 is installed on the inner diameter side of the upper surface of the adjusting ring 2. The inner frame 3 has a thick lower end, sits firmly on the adjusting ring 2, and has an upper cylindrical shape.
The upper edge follows the lower surface of the receiving frame 4 and bends toward the large diameter side. This inner frame 3
Is to be buried without being removed after mortar injection. f) Screw the three fixing bolts 8 into the insert 6 of the adjusting ring 2, and fit the conical coil spring 7 onto the fixing bolts 8. It is preferable that the coil spring 7 has a spring rigidity that allows a sufficient adjustment margin to be secured even when the receiving frame 4 is placed, and has a truncated cone shape that becomes a flat surface when completely compressed and brought into close contact. g) Next, the receiving frame 4 is placed. Since the bolt hole of the receiving frame 4 is generally large, the washer 11 is placed on the upper surface of the coil spring 7 to place the receiving frame 4. At this time, the upper edge of the flexible inner frame 3 is bent back between the adjusting ring 2 and the receiving frame 4. h) Fit a nut 9 into the fixing bolt 8 of the receiving frame 4, and screw the nut 9 so that the upper surface of the receiving frame 4 is flush with the road surface. The height adjustment of the top surface of the manhole can be set to an arbitrary top surface height and inclination only by tightening the nut 8. This completes the top surface height adjustment. i) A rubber outer frame 31 is fitted on the outside of the manhole so as to surround the outer diameters of the receiving frame 4 and the adjusting ring 2. j) Attach the funnel 32 for pouring mortar to the highly inclined portion of the outer frame 31. k) Fast-flowing soft-mixing cement mortar with high fluidity 10
(For example, a brand name, HICEMECON) is injected from the funnel 32. l) When the mortar is hardened, pavement is applied around the receiving frame to complete the manhole installation work. FIG. 3 is an explanatory view for explaining the installation state of the receiving frame 4 tilted to the left and right, and shows a cross section of the fixing bolt 8 on the left and right. When a fast-curing filling material is used as the mortar 10, the strength is rapidly expressed, and the compressive strength becomes about 100 kgf / cm ^{2 within} 3 hours after construction, which allows early traffic opening.

[0016]

Since the present invention is constructed as described above, the height of the top surface of the existing manhole can be easily adjusted, and the space between the receiving frame and the adjusting ring can be densely filled with mortar. Therefore, it is possible to form a manhole structure that is labor-saving and can be installed quickly and has high reliability.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a method of adjusting a top surface height of an existing manhole according to an embodiment.

FIG. 2 is an explanatory diagram showing a method of adjusting the height of the top surface of the existing manhole according to the embodiment.

FIG. 3 is an explanatory diagram showing a state of a tilted manhole upper surface.

FIG. 4 is an overall sectional view of an existing manhole.

[Explanation of symbols]

1 Body 2 Adjustment Ring 3 Inner Frame 4 Receiving Frame 5 Lid 6 Insert 7 Coil Spring 8 Bolt 9 Nut 10 Mortar 11 Washer 21 Pavement Plate 22 Sinking 23 Cutting Line 24 Pavement Part 31 Outer Frame 32 Inclination

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirotaka Nagashima 2-19 Nakamachi, Kawaguchi City, Saitama Prefecture Nagashima Foundry Co., Ltd. (72) Inventor Hiromasa Shimura 2-11 Takaishi, Aso-ku, Kawasaki City (72) Inventor Yasuo Nakazato 751 Shinmaruko-cho, Nakahara-ku, Kawasaki-shi Nichicon Co., Ltd. (56) References JP-A 5-179607 (JP, A) JP-A 6-228981 (JP, A)

Claims (2)

(57) [Claims] 1. When adjusting the height of the top surface of an existing manhole, a pavement portion around the manhole is cut into a circle to cut an edge with a pavement plate, and then the pavement portion is destroyed and removed to mount a receiving frame.
Remove the bolts, pull up the receiving frame to remove the receiving frame of the manhole lid, adjust the adjusting ring, and then arrange the flexible cylindrical buried inner frame and coil spring on the adjusting ring, and receive the receiving frame on it. The height of the top of the existing manhole is characterized by adjusting the nut of the receiving frame mounting bolt to match the height of the upper surface of the receiving frame with the road surface, injecting cement mortar into the space under the receiving frame, and then paving the periphery of the receiving frame. Adjustment method. 2. The adjustment ring is adjusted by adjusting an existing adjustment ring.
Removal, replacement, reuse, and new adjustment ring
The method for adjusting the top surface height of an existing manhole according to claim 1, wherein the method is one or more means selected from an additional group .