JPH072701Y2 - Frame bolt for manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a manhole receiving frame bolt used for fastening and fixing a receiving frame such as an assembled manhole to a manhole body.

[Prior Art] Water supply and sewer systems, common ditches, etc. are provided with manholes that allow people to enter and exit. This type of manhole is generally one in which a receiving frame for holding a manhole lid is arranged on the opening end surface of a cylindrical manhole body, and this receiving frame is fastened to the manhole body using receiving frame bolts. Is.

Then, in such a thing, an adjustment ring or packing is interposed between the opening end surface of the manhole main body and the receiving frame so that the upper surface of the manhole cover appears flush with the ground surface. The height position of the receiving frame is adjusted. Then, a through bolt type is used as the receiving frame bolt, and the flange portion of the receiving frame, the packing, and the adjusting ring are passed through and screwed to an insert nut embedded in the opening end surface of the manhole body. The receiving frame is fixed to the manhole body so that it will not come off due to traffic vibration.

[Problems to be Solved by the Invention] By the way, at a construction site where such an assembly type manhole is constructed, the design ground height is often changed during or after construction. In such a case, the number and type of adjustment rings to be used must be changed, the receiving frame bolts must also be replaced with those having appropriate dimensions, and the height of the manhole must be adjusted to accommodate the raising and lowering of the road surface. I won't.

However, conventionally, it is the actual situation that several types of receiving frame bolts are prepared in advance at each construction site or they are brought to the site appropriately every time the ground height is changed. For this reason, a decrease in work efficiency and complicated management of the receiving frame bolts are problems.

The present invention aims to suitably solve the above problems.

[Means for Solving the Problem] The present invention adopts the following configuration in order to achieve such an object.

That is, the receiving frame bolt for a manhole according to the present invention comprises a plurality of coupler elements having screw holes open at both end surfaces, a fixing bolt element and a plurality of connecting bolts which can be screwed into the screw holes of the coupler elements. And coupling the coupler elements sequentially in the axial direction through the connecting bolt elements in a state where the end surfaces of the coupler elements are in close contact with each other, and connect the coupler elements to the respective open end surfaces of the coupler elements at both ends. It is characterized in that the fixing bolt element and the connecting bolt element are screwed together.

[Operation] With such a configuration, the bolt size of the receiving frame bolt is determined by the number of coupler elements to be connected and their dimensions. Therefore, if an appropriate number and types of coupler elements are prepared, it is possible to easily construct a bolt having a required size by combining these.

In addition, since the couplers are connected in a state where the end faces of the coupler elements are in close contact with each other, there is no rattling, and when stress is applied to the bolt, its strength is easily impaired. There is no such thing. That is, in the connection bolt element screwed into the screw hole provided in the coupler element, the end surfaces of the coupler elements are in close contact with each other,
Since there is no portion exposed to the outside, that is, the structure is completely covered by the two coupler elements whose end faces are in close contact with each other, and the connecting bolt element and the coupler element are integrated, the structure is substantially Although the connecting bolt element has a shape similar to that having a large diameter, and the structure is such that the connecting bolt elements are connected, rattling does not occur between the coupler element and the connecting bolt element.

Moreover, with such a structure, the cross-sectional area of the connecting bolt element is substantially increased, and the stress applied to the connecting bolt element can be reduced. Further, due to the close contact of the end faces, frictional resistance is generated between the coupler elements, and movement of the coupler elements is restricted, so that the connection bolt element and the coupler element can be prevented from loosening, and the strength in the axial direction can be prevented. Can be increased.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the receiving frame bolt 1 of this embodiment includes a plurality of cylindrical nut-shaped coupler elements 2 having screw holes 2b opened at both end surfaces 2a formed therein, and the coupler elements 2 thereof.
It is constituted by a fixing bolt element 3 and a plurality of connecting bolt elements 4 which can be screwed into the screw holes 2b. The length of the connecting bolt element 4 is slightly shorter than that of the coupler element 2, and the length of the fixing bolt element 3 is longer than these connecting bolt elements 4. Further, in these coupler elements 2, the inner screw hole 2b is squeezed in the central portion by pressing the body portion from the outside.

Then, assembling is carried out by screwing the connecting bolt element 4 into the screw holes 2b, 2b of both coupler elements 2, 2 respectively until they are close to the central throttle, and firmly fastening until the end faces 2a, 2a come into close contact with each other. The operation of connecting the coupler elements 2 and 2 to each other is sequentially performed for the required number, and the fixing bolt element 3 and the connecting bolt element 4 are provided on the open end surfaces 2a and 2a of the coupler elements 2 and 2 at both ends. It can be appropriately configured by a simple procedure such as screwing. By this, each connecting bolt element 4 on which the coupler element is screwed at both ends,
The coupler element 2 makes it encapsulated and there is no portion exposed to the outside.

Next, the manhole 5 to which this receiving frame bolt 1 is applied is
Shown in Figures and FIG. This manhole is provided with a receiving frame via adjusting rings 7 and 8 and packing 9 provided on the opening end surface 6a of the manhole body 6 for changing the height position.
The manhole cover 11 is detachably held on the receiving frame 10 by mounting the mandrel 10.

The manhole body 6 is formed by stacking and connecting a rectangular block, a straight wall block 12 and a swash wall block 13 on a bottom plate (not shown). The opening end surface 6a, which is the upper surface of the swash wall block 13, is galvanized. The insert nuts 14 are embedded in the circumferential direction at a predetermined pitch.

The adjusting rings 7 and 8 are annular ones corresponding to the receiving frame 10, are made of concrete, and have bolt insertion holes 7a having a diameter slightly larger than that of the coupler element 2 at a portion corresponding to the insert nut 14. Have 8a.

Further, the packing 9 placed on the upper surfaces of the adjusting rings 7 and 8 and the flange portion 10a of the receiving frame 10 respectively correspond to the insert nut 14 and the bolt insertion holes 7a and 8a of the adjusting rings 7 and 8, respectively. Bolt insertion holes 9a and 10b having a diameter slightly larger than that of the fixing bolt element 3 are provided in the portion. Then, when the installation of the adjusting rings 7 and 8 is completed at the work site, the packing 9 to be placed from now on.
And the thickness dimension from the flange portion 10a to the bottom portion of the insert nut 14 is measured by taking the thickness of the flange portion 10a of the receiving frame 10 into consideration, and the coupler element 2 and the connection are made so that the receiving frame bolt 1 is slightly longer than this dimension. The number and type of bolt elements 3 (in this case, three identical elements in each case) are appropriately selected and connected and fixed. Then, the receiving frame bolt 1 configured in this way is inserted from the flange portion 10a, the lower end is screwed into the insert nut 14, and then the insertion hole 9 is inserted.
The packing 9 and the receiving frame 10 are placed by inserting a and 10b into the fixing bolt element 3. After that, the nut 15 is attached to the bolt end protruding from the flange 10a and tightened, and the attachment of the adjusting rings 7 and 8 to the manhole body 6 is completed.

Then, if the receiving frame bolt 1 having the above-mentioned configuration,
Depending on the number of coupled coupler elements 2 and their dimensions,
The bolt size of the receiving frame bolt 1 will be determined. Therefore, even if the height of the road surface changes due to the raising or cutting of the road, and the number of adjusting rings changes accordingly, or it becomes necessary to replace the adjusting rings with different thicknesses, This can be easily accommodated by adjusting the length as described above. That is, when the number of adjusting rings is increased or decreased, or when the number of adjusting rings is changed, the number of connecting bolt elements 4 and coupler elements 2 may be increased or decreased accordingly. Therefore, such a structure can be applied to any road surface height by preparing a plurality or a plurality of connecting bolt elements 4 and coupler elements 2.

Further, since this is fastened with the end faces 2a of the coupler elements 2 in close contact with each other, the whole is firmly fixed in the axial direction. Moreover, these coupler elements 2 will be retightened when the nut 15 is finally tightened by fastening the nut 15 to the upper end of the fixing bolt element 3. Therefore, sufficient strength can be ensured even with such an assembly type. Further, as described above, since the central portion of the screw hole 2b of each coupler element 2 is narrowed, the tip of the connecting bolt element 4 is deeply screwed only on one coupler element 2, which causes a problem. Connection bolt element 4 on both coupler elements 2
It will be screwed in substantially evenly.

In the above description, the receiving frame bolt 1 is inserted after the installation of the adjusting rings 7, 8 and the like is completed.
Connection bolt element 4 required in advance for each insert nut 14
Alternatively, the coupler element 2 may be connected, and the required adjustment ring may be placed using this as a guide.
In this case, the adjustment ring can be easily positioned. The fixing bolt element may be the same as the connecting bolt element. Further, in the above embodiment, the screw hole 2a is narrowed down by pressing the central portion of the coupler element 2 from the outside, but the pin is inserted or penetrated from the inside of the side surface of the coupler element for connection. It is also possible to regulate the screwing depth of the bolt element.

In addition, the cross-sectional shape and the like of the coupler element, the fixing bolt element, the connecting bolt element, etc. are not limited to those of the illustrated embodiment,
Various modifications can be made without departing from the spirit of the present invention.

[Effect] According to the present invention, by appropriately selecting and connecting the number and types of the coupler element and the connecting bolt element as described above, a receiving frame bolt having a required size can be easily produced. Even if it is necessary to change the number of laminated adjustment rings or change the thickness of adjustment rings due to increase or decrease in road surface height, it is possible to provide a manhole receiving frame bolt that can easily handle it. it can. Further, since the end surfaces of the coupler elements are brought into close contact with each other, the coupler element and the connection bolt element are integrated with each other, and the connection bolt element is covered with the coupler element, the space between the coupler element and the connection bolt element is reduced. It is possible to prevent rattling, and since impurities such as water and oil do not directly adhere to the connecting bolt element, the durability of the connecting bolt element is greatly improved and adjustment is possible. The ring can be fixed in a stable and strong state for a long period of time.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an overall view of a receiving frame bolt, FIG. 2 is a sectional view showing a state where the receiving frame bolt is applied to a manhole, and FIG. 3 is an enlarged part of FIG. FIG. 1 ... Receiving frame bolt, 2 ... Coupler element 2a ... End surface, 2b ... Screw hole 3 ... Fixed bolt element, 4 ... Connection bolt element 5 ... Manhole, 6 ... Manhole body 6a ... Opening end surface, 7 …… Adjustment ring 7a …… Bolt insertion hole, 8 …… Adjustment ring 8a …… Bolt insertion hole, 9 …… Packing 9a …… Bolt insertion hole, 10 …… Receiving frame 10a …… Flange part, 10b …… Bolt insertion hole Hole 11 …… Manhole cover, 12 …… Straight wall block 13 …… Slanting wall block, 14 …… Insert nut 15 …… Nut

Claims (1)

[Scope of utility model registration request] 1. A plurality of coupler elements each having a screw hole opened at both end faces therein, a fixing bolt element and a plurality of connecting bolt elements which can be screwed into the screw holes of these coupler elements. In the state in which the end surfaces of the coupler elements are in close contact with each other, the coupler elements are sequentially connected in the axial direction via the connecting bolt elements, and the fixed bolt elements and the A receiving frame bolt for a manhole, which is constructed by screwing a connection bolt element.