JPH0617872Y2 - Frame receiving structure for lids for underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a structure of a receiving frame that supports a lid for a manhole or other underground structure.

<Prior Art> Manholes installed on the road surface and lids for other underground structures, when a vehicle passes over the top surface, are subjected to heavy impact and external force due to vibrations. Moreover, such an external force is an extremely large dynamic load that is instantaneously generated and frequently generated, and acts from the lid to the receiving frame that supports the lid. Therefore, rattling occurs between the receiving frame and the lower stile supporting the receiving frame, and the pavement surface around the receiving frame is destroyed, and the lower stile is also destroyed after a long period of time.

As a fixing structure of the receiving frame for an underground structure which prevents the above-mentioned pavement surface, lower pit, etc. from being destroyed, for example, the one described in Japanese Utility Model Publication No. 54-89158 is known.

This receiving frame fixing structure is provided with a flange at the lower end of the receiving frame that has a hole for inserting the anchor bolt planted on the upper surface of the lower pit in the ground, and the nut is screwed from above to the anchor bolt protruding from the hole. The receiving frame is fixed.

<Problems to be solved by the invention> On the other hand, the road surface needs to be repaved depending on the damage to the road surface or the subsidence of the roadbed caused by the frequent passage of vehicles. When the road surface is repaved, a step is generated between the road surface and the lid of the underground structure. Therefore, in order to match the position of the lid with the newly formed road surface, it is necessary to raise and lower the volume.

Since this bulk adjustment is performed by attaching and detaching a bulk adjusting ring as a spacer between the lower sill buried in the ground and the receiving frame, the receiving frame must be temporarily removed from the lower stile. However, since the anchor bolt is buried in the ground in the conventional receiving frame fixing structure described above, it is necessary to excavate the road surface up to the anchor bolt portion in order to separate the receiving frame and the lower stile. Therefore, the work of excavating and repairing the road surface before and after adjusting the bulk of the lid is involved, which is a drawback that the work becomes extremely complicated.

In addition, since the road surface is paved with asphalt and concrete, cement mortar etc. may remain attached to the screw groove of the embedded anchor bolt,
It is difficult to remove the nut unless the cement mortar in the screw groove is removed or oil is applied during the bulk adjustment work of the lid, and the working time becomes extremely long.

Furthermore, since the bulk adjustment of the lid is restricted by the length of the anchor bolt, it is impossible to raise the lid more than the length of the anchor bolt.

On the other hand, as described in Japanese Utility Model Laid-Open No. 57-197540, there is also known a structure in which the inner portion of the receiving frame is hollow and a nut is provided at the bottom, and the nut is connected to an anchor bolt. .

However, also in the above-mentioned structure, the nut is located in the hollow portion, so that it is necessary to operate a tool such as a spanner in a narrow space, and workability is extremely poor.

Japanese Utility Model Publication No. 59-51849 and Japanese Utility Model Publication No. 60-1265.
The receiving frame fixing structure described in Japanese Patent No. 39 has a bolt and a nut provided on the outer surface of the receiving frame so as to be embedded in the ground, cement mortar, or the like, and therefore is described in Japanese Utility Model Publication No. 54-89158. Almost the same as the above, the road surface needs to be excavated up to the bolt part in order to separate the receiving frame and the lower basin, so the process of excavating and repairing the road surface before and after the lid bulk adjustment is involved. Not only is there a drawback that the work becomes extremely complicated, but there are cases where cement mortar etc. is still attached to the screw groove of the bolt, so the cement mortar in the screw groove can be removed during bulk adjustment work of the lid. It is difficult to remove the nut unless it is removed or oil is applied, and the working time is extremely long.

<Means for Solving Problems> The present invention has been proposed in view of the above-mentioned conventional drawbacks.
An outer peripheral portion of a receiving frame for supporting the lid installed on the upper surface of the lower basin is provided with a substantially cylindrical peripheral wall portion having no protruding portion in the radial direction, and a hole for inserting a connecting bolt is formed inside the peripheral wall portion. Then, a female screw tool for screwing a connecting bolt inserted into the hole is attached to the lower rod.

<Embodiment> The present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is an enlarged vertical sectional view of a main part showing a first embodiment of the present invention.

In FIG. 1, a lid 1 is supported by a receiving frame 2 installed at a level equal to the road surface R by taper fitting around the receiving frame 2.

A lower basin 3 communicating with an underground structure is located below the receiving frame 2, and a bulk adjusting ring 4 is arranged between the upper end surface of the lower basin 3 and the lower end surface of the receiving frame 2 for bulk adjustment. is doing.
These receiving frame 2, bulk adjusting ring 4 and lower basin 3 are
It is integrated by connecting with the connecting bolt 5 inside the outer peripheral surface 14. For this purpose, a nut or a female screw 6 (hereinafter referred to as "nut 6") as a female screw tool that is screwed into the connecting bolt 5 is provided in the lower basin 3 in an embedded form.
A sleeve 7 through which a connecting bolt 5 is inserted into the bulk adjusting ring 4.
Is equipped with.

In the first embodiment of the present invention shown in FIG. 1, the inner side of the receiving frame 2 is projected at several places to form the connecting portion of the connecting bolt 5, and the lower end of the inner peripheral surface of the receiving frame 2 corresponds to the attaching portion. An inward flange-shaped portion is provided to form a bolt insertion hole 11 through which the connecting bolt 5 is inserted.

In addition to the flat washer 12, the spring washer is preferably provided on the receiving surface of the receiving frame 2 of the connecting bolt 5 in order to prevent buffering of the connecting bolt 5 due to vibrations and impacts received from a passing vehicle.

Further, the outer peripheral surface 14 of the receiving frame 2 has a shape without a protrusion,
Preferably, the taper surface is shaped so as to reduce its diameter downward, but it may also be a straight wall shape parallel to the axis of the receiving frame 2, or a curved surface shape that is convex upward. Regardless of the shape of the outer peripheral surface 14 as described above, it is assumed that there is no protruding portion at all so that the removal work of the receiving frame 2 will not be hindered. In addition, in order to prevent the asphalt for paving and the receiving frame 2 from adhering to the outer peripheral surface 14,
It is preferable to wind a peeling sheet such as oil paper.

The lower basin 3 is made of generally used resin concrete. At the time of molding the lower basin 3, a nut 6 that is screwed into the connecting bolt 5 is embedded in the lower basin 3 by an insert molding method.

The bulk adjusting ring 4 is made of a recycled plastic or a hard synthetic resin, but it is preferable that the bulk adjusting ring 4 has a strength capable of withstanding a weight to be applied and an impact and also has an elastic effect.
Further, the sleeve 7 arranged on the protruding portion corresponding to the inner surface shapes of the receiving frame 2 and the lower frame 3 in the bulk adjusting ring 4 is not only for inserting the connecting bolt 5, but also for reinforcing against the weight to be loaded. Also fulfills the function of. Therefore, the material of the sleeve 7 is preferably a steel pipe or a stainless pipe having a high axial strength. In consideration of the elastic deformation of the bulk adjusting ring 4, the upper end of the sleeve 7 is manufactured so as to be located below the upper surface of the bulk adjusting ring 4 at the stage of molding. Due to this arrangement of the sleeve 7, even if the bulk adjusting ring 4 is slightly elastically deformed by a compressive load after installation and reaches the same level as the upper end of the sleeve 7, the sleeve 7 supports the receiving frame 2 together with the bulk adjusting ring 4 as a whole. And functions to maintain the level of bulk adjustment.

The outer diameter of the bulk adjusting ring 4 is set to be substantially equal to or slightly smaller than the outer diameter of the lower end of the receiving frame 2. This is for the purpose of removing and installing the receiving frame 2 after exchanging the receiving frame 2 when exchanging the bulk adjusting ring 4 which has already been installed, without requiring excavation work in the soil.

Next, a procedure for mounting the bulk adjusting ring 4 at the time of raising adjustment will be described.

First, the connecting bolt 5 inserted into the bolt insertion hole 11 of the flange-shaped portion provided at the lower end of the inner peripheral surface of the receiving frame 2 is loosened with a tool, and the screw engagement with the nut 6 of the lower rod 3 is released. Then
After pulling up the receiving frame 2 to the ground, the bulk adjusting ring 4 having a required height is placed on the upper surface of the lower basin 3 or the existing upper surface of the bulk adjusting ring 4.

Further, the position of the sleeve 7 of the bulk adjusting ring 4 is aligned with the nut 6 of the lower rod 3, the receiving frame 2 is placed on the bulk adjusting ring 4 again, and the bolt insertion hole 11 is aligned with the sleeve 7 to connect the connecting bolt. Insert 5 into this.

Then, by screwing the connecting bolt 5 into the nut 6, it is possible to raise the receiving frame 2 by the height of the bulk adjusting ring 4.

In addition, the procedure of the bulking down work accompanying the decrease in the level of the road surface R is
Similar to the above, first, the receiving frame 2 is removed, the existing bulk adjusting ring 4 is taken out, and the bulk adjusting ring 4 having a required size is obtained.
Replace with. After this replacement work, as in the case of raising, the receiving frame 2 is installed and the connecting bolt 5 is attached to the nut 6 of the lower rod 3.
Work is completed by screwing in and fixing.

As described above, in order to remove the receiving frame 2 at the start of construction, it is not necessary to excavate the road surface R around the entire periphery of the receiving frame 2, the work process can be simplified, and the work can be performed without any trouble even if the number of workers is reduced.

Further, since the connecting bolt 5 is screwed into the nut 6 of the lower basin 3 before the operation, cement mortar and the like are not attached to the screw portion at all. Therefore, the work of screwing the nut 6 after inserting the bulk adjustment ring 4 can be smoothly performed, and the workability can be improved.

Further, by replacing the connecting bolt 5 with a long one, it is possible to easily make a large adjustment of the height in the field.

As shown in the first embodiment of the present invention, the mounting position of the connecting bolt 5 is on the inner peripheral side of the receiving frame 2 so that it is always protected by the lid 1. There is no danger of interfering with the connection work.

It should be noted that the lower rod 3 may be formed with a female screw that is screwed into the connecting bolt 5 to substitute for the nut 6. In the case of processing the female screw on the lower basin 3 in this manner, the lower basin may be made of a metal material such as cast iron in view of the thread cutting and strength.

FIG. 2 is a cross-sectional view of a main part of a second embodiment of the present invention. This is a hakama-shaped cover whose outer periphery is continuous with the lower part of the outer peripheral surface 14 of the receiving frame 2 in order to protect the bulk adjusting ring 4 made of resin. The part 2a is formed. The cover portion 2a is provided with a bulk adjustment ring 4
As an annular body that surrounds the circumference of the road, it extends below the level of the lower basin 3 and blocks the asphalt to be built on the road surface R and the peripheral surface of the bulk adjustment ring 4. The other structure is exactly the same as that described above, and the receiving frame 2 is moved to the lower frame 3 by screwing the connecting bolt 5 into the nut 6 integrated with the lower frame 3.
Can be connected and fixed to. In addition, 6a is a reinforcing bar for fixing the nut 6 to the lower rod 3 in a fixed manner.

With the cover 2a thus provided, the resin bulk adjustment ring 4 can be protected during asphalt construction. That is, the bulk adjusting ring 4 does not come into contact with the asphalt at the time of repairing the road surface R, so that the bulk adjusting ring 4 is not thermally affected by the high temperature asphalt. Therefore, the bulk adjustment ring can be prevented from being damaged, and the bulk adjustment work can be performed without causing a deviation in the bulk adjustment level.

FIG. 3 is a sectional view of an essential part showing a third embodiment of the present invention, in which a synthetic resin cap 20 is fitted and arranged in a recess 10 of a receiving frame 2 for accommodating the head of a connecting bolt 5. Is. In FIG. 3, reference numeral 21 is a floor plate made of ductile cast iron interposed between the lower surface of the receiving frame 2 and the upper surface of the lower basin 3, and the unexplained reference numerals in FIG. Since it has the above configuration, the description is omitted.

The floor plate 21 is smaller than the outer diameter of the lower end of the receiving frame 2 so that it can be removed after the receiving frame 2 is removed without excavating the soil.

In the above embodiment, by providing the cap 20, it is possible to prevent concrete mortar, asphalt, or the like from entering from the recess 10 buried under the road surface R toward the screw portion of the connecting bolt 5. Therefore, the screw portion of the connecting bolt 5 can be protected, and the connection with the nut 6 in the bulk adjustment work can be facilitated.

In addition to the resin concrete in which the nut 6 is integrally attached, the lower basin 3 shown in each of the embodiments according to the drawings of the present invention uses a nut 6 made of a metal material such as cast iron.
It is also possible to embed a cylindrical female screw instead of the above.

<Effect of the Invention> As described above, in the receiving frame of the lid structure for an underground structure according to the present invention, the outer peripheral portion of the receiving frame is provided with a substantially cylindrical peripheral wall portion having no protruding portion in the radial direction, and Since a hole for inserting the connecting bolt is opened inside the peripheral wall and a female screw tool for screwing the connecting bolt to be inserted in the rear portion is attached to the lower rod, it can be operated from above the receiving frame or inside the receiving frame. By attaching and removing the connecting bolts, it is not necessary to excavate the road surface around the receiving frame in bulk adjustment work, so that the construction is extremely simple. Moreover, since the road surface repair process after construction is unnecessary, the working time can be shortened. Further, since cement mortar and asphalt from the road surface do not adhere to the head portion, the screw portion and the nut of the lower rod of the connecting bolt, the work of attaching / detaching the receiving frame to / from the lower rod can be performed with remarkably light labor. Further, by appropriately selecting the length of the connecting bolt, it is possible to cope with a large volume adjustment.

[Brief description of drawings]

FIG. 1 is an enlarged longitudinal sectional view showing an essential part of a first embodiment of the present invention, FIG. 2 is an enlarged sectional view showing an essential part of a second embodiment of the present invention, and FIG. 3 is a book. It is sectional drawing which expands and shows the principal part of 3rd Example of a device. 1 is a lid, 2 is a receiving frame, 3 is a lower rod, 4 is a bulk adjusting ring, 5 is a connecting bolt, 6 is a nut, 7 is a sleeve, 11 is a hole for inserting a bolt, and 14 is an outer peripheral surface.

Claims (1)

[Scope of utility model registration request] 1. A peripheral wall of a receiving frame for supporting a lid, which is installed on the upper surface of a lower basin, is provided with a substantially cylindrical peripheral wall portion having no protruding portion in the radial direction, and a connecting bolt is inserted inside the peripheral wall portion. The hole is opened, and a female screw tool for screwing a connecting bolt inserted into the hole is attached to the lower rod.