JPH072717Y2 - Lid receiving frame fixing structure for manholes - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] This device is used to cover manholes, sewage basins, rainwater basins, grate covers, sluice valves for underground water, water shutoff valves, fire hydrants, etc. The present invention relates to a fixing structure for a receiving frame of various lids and the like and an opening main body supporting the receiving frame.

[0002]

2. Description of the Related Art A conventional lid receiving frame and an opening main body in, for example, a sewage basin, as shown in FIG.
3 with concrete curling part 2 applied to
Is brought to the site and placed on the main body 4 of the drainage basin, which is the opening body, via an adhesive means such as mortar or, if necessary, on the joint foot 5. In the figure, 6 is a lid. The receiving frame 1 and the lid 6 are made of cast iron.

In order to perform the curling of concrete on the receiving frame 1, a mold made of an iron plate is used. Even if the receiving frame 1 can be used for the same sewage basin main body 4, the design and shape of the receiving frame 1 differ depending on the manufacturer, but the overall shape and dimensions also differ. Such a difference similarly exists in any of the receiving frames of the various lids. In other words, the receiving frame of this type of lid has a uniform inner diameter corresponding to the nominal dimension determined in stages, but the other portions are not necessarily constant.

In addition to this, there is a case where the receiving frame is simply placed directly on the opening main body, that is, on the concrete portion supporting the receiving frame without edging the receiving frame. In this case, the receiving frame may be laterally displaced by the external pressure during the construction of the peripheral portion, causing water leakage or being lost together with the lid by the time the construction of the peripheral portion is completed, which is not practical.

[0005]

The conventional method of carrying out curling processing on the receiving frame and bringing it to the site is excellent in that concrete construction corresponding to curb processing is not required at the construction site. However, this method has the following drawbacks. Since many kinds of manhole lids are used, there are many types of receiving frames, and unless the receiving frame is specified, it is impossible to start production, so it is impossible to make a prospective production. Therefore, there is a problem that the delivery time becomes long. In addition, the large number of types of receiving frames means that the number of concrete forms will be large, and it will be necessary to make a form for each new receiving frame, and it is necessary to manage old forms that are expected to be used. However, there is a problem that it takes time and space to manage the large number of forms. In particular, in the case of a manhole receiving frame, even if the receiving frame has the same nominal diameter, the forming frame will be different depending on the presence or absence of the hinge and the size difference thereof, and the forming frame will be increased accordingly.

The object of the present invention is to solve the above problems. .

[0007]

This invention is a lid receiving frame fixing structure such as a manhole in which a receiving frame of a lid is fixed to an upper part of a concrete opening body, and the opening body has an upper surface as a receiving frame supporting surface. Is formed, the receiving frame has a flange-shaped portion on the lower outer periphery and is placed in a positional relationship of being fixed on the supporting surface, and the lateral portion engaged with the upper surface portion of the flange-shaped portion and the lateral portion thereof. And a plurality of embedded nuts are provided on the outer side surface of the opening body, and the vertical L-shaped member is formed at a plurality of positions. It is characterized in that a fixing bolt is screwed into the embedded nut through the portion.

[0008]

According to the above means, the opening main body provided with the embedded nut is produced at the factory and brought to the construction site together with the receiving frame, and the opening main body is installed at the pre-formed opening main body installation position, A receiving frame is placed on it, and is fixed by using an inverted L-shaped member and a fixing bolt. Since the inverted L-shaped member and the fixing bolt are provided with embedded nuts at predetermined positions to be provided at a plurality of positions in the circumferential direction of the opening, the vertical portion of the inverted L-shaped member is fixed in this fixed state. Since the horizontal portion is fixed to the opening main body by the bolt and the lateral portion is engaged with the flange portion of the receiving frame, the receiving frame does not move laterally or upward with respect to the opening main body.

[0009]

EXAMPLE A first example will be described with reference to FIGS.
In this embodiment, a manhole receiving frame fixing structure is used.
Is a receiving frame, 11 is an opening main body, 12 is an inverted L-shaped member, 13
Is a fixing bolt.

The receiving frame 10 has an inner hole 21 into which the lid 20 is fitted and closed, an inner diameter portion 22 corresponding to the nominal diameter, and a flange 23 on the lower outer periphery.

The opening body 11 is made of concrete in the shape of a short cylinder, has an inner diameter portion 24 corresponding to the nominal diameter of the receiving frame 10, and has a flat supporting surface 25 of the receiving frame 10 at the upper end. An engaging portion composed of an annular convex portion 26 is formed on the lower end surface, and embedded nuts 27 are provided so as to be exposed at three positions at regular intervals from the supporting surface 25 at equal intervals. The supporting surface 25 has an outer diameter equal to the maximum outer diameter of many types of manhole receiving frames having the same nominal diameter so as to correspond to the maximum outer diameter of the annular bottom surface. The outer diameter of the lower end is formed to be equal to the outer diameter of the concrete tubular member 28 in which the opening main body 11 is provided.
The lower end outer diameter is generally smaller than the upper end outer diameter. The outer peripheral surface is formed with the same outer diameter from the upper end to a little lower than the position of the embedded nut 27, and is tapered downward from the position to the outer periphery of the lower end.

The inverted L-shaped member 12 is, as shown in FIG.
It includes a horizontal portion 29, a vertical portion 30, and a connecting bolt 31. The lateral portion 29 is formed by punching a steel plate in a strip shape, forming a long hole 32 for the coupling bolt 31 near one end portion, and bending a small protrusion 33 at the other end portion. Vertical section 30
In the same manner, a steel plate is punched out and bent in two opposite directions to form a small protrusion 34, a portion 35 along the lateral portion 29, and a vertically extending portion 36 as shown in FIG. 2A. 36
A long hole 37 for inserting the fixing bolt 13 is formed near the lower end of the. A through hole is formed in the portion 35 and a nut 38 is welded to the nut 35, and a coupling bolt 31 having a long hole 31 penetrating therethrough is screwed into the nut 38. As a result, an inverted L-shaped member including the lateral portion 29 is formed.

The fixing bolt 13 has a screw portion which is screwed into the embedded nut 27 of the opening body 11.

In the receiving frame fixing structure thus constructed,
The opening main body 11 is processed in advance in the factory separately from the inverted L-shaped member 12 and the call fixing bolt 13, and this is brought to the site together with other parts, and the opening main body 11 is set at a predetermined installation position. The receiving frame 10 is placed, and three sets of inverted L-shaped members 1
2 and the fixing bolt 13. The fixing is performed by adjusting the position of the vertical portion 30 and tightening the fixing bolt 1 first, then adjusting the position of the horizontal portion 29, and then tightening the connecting bolt 31. As a result, the vertical portion 30 is first fixed to the opening body 11, and when the coupling bolt 31 is tightened, the flange portion 23 of the receiving frame 10 is pressed against the support surface 25 by the small protrusion 33. And are combined. FIG. 3 is a plan view showing the fixed state.

The lower surface of the receiving frame 10 shown in FIG. 1 has a receiving frame supporting surface 2
5, but if the outer diameter of the flange portion 23 is smaller than this if the receiving frame has the same nominal diameter, the flange portion should be held within the adjustment range of the lateral portion 29. The opening body 11 and the inverted L-shaped member 1 are formed.
2 can be shared. Therefore, it is preferable that the opening main body 11 has a receiving frame supporting surface 25 capable of accommodating the largest flange among several receiving frames having the same nominal diameter.

A second embodiment will be described with reference to FIG. In the figure, the difference from the first embodiment is that the inverted L-shaped member 12a
Since the other components are the same and the other components are the same, the same parts are designated by the same reference numerals and the description thereof will be omitted.

The inverted L-shaped member 12a has a horizontal portion 29a and a vertical portion 30a formed of a series of members.
The through hole is formed in a, the nut 40 is welded, and the bolt 41 is screwed. The length of the lateral portion 29a cannot be adjusted, but by appropriately determining the length, a receiving frame group having the same nominal diameter can be obtained. Can be formed to be applicable to most of

In the fixing operation, the point different from the first embodiment is that the bolt 41 is tightened after the fixing bolt is tightened. As a result, the flange 23 of the receiving frame 10 is pressed by the tip of the bolt 41.

Also in this embodiment, similarly to the first embodiment, the receiving frame 10 can be fixed to the opening body 11, and if the receiving frame has the same nominal diameter, the opening body 11 can be shared, and the inverted L-shaped member 12a can also be used. Almost all can be shared, but depending on the case, the lateral portion 29a
You only need to prepare two types with different lengths.

Although the above-mentioned embodiment is a manhole embodiment, it can be applied to a fixing structure of various frame lid receiving frames and an opening main body for supporting the receiving frames, that is, a main body or a joint leg. In that case, when the receiving frame is a prismatic one 10b, FIG.
It is preferable to provide the inverted L-shaped member 12b at four places as shown in FIG. Note that the number may be increased if necessary.

In the above embodiment, the opening main body and the receiving frame are connected and fixed at the construction site, but they may be combined and shipped at the factory.

[0022]

According to the present invention, the opening body to be coupled and fixed to the receiving frame of the lid such as the manhole is formed separately from the receiving frame, and this and the receiving frame can be easily coupled and fixed at the installation site or factory. Since the opening L body is used for the connection and fixing so that the opening body can be commonly used by a plurality of receiving frames having the same nominal diameter, the prospective production of the opening body becomes possible. In other words, in the conventional edging process, even if the nominal size of the manhole etc. was decided, it could not be processed in the factory unless the receiving frame was specified, but if the fixing structure of this invention was applied, if the nominal diameter was decided immediately Production can be started, and prospective production of the opening main body can be carried out according to the nominal size of the manhole or the like expected to be used. As a matter of course, the inverted L-shaped member and the bolt can be widely used even if the receiving frames have different nominal dimensions, and since they are not bulky, there is no problem in inventory. As a result, orders from contractors can be met in a short period of time.

Further, since the opening main body can be shared by a plurality of types of receiving frames, the number of molds can be reduced accordingly.

The opening main body is made of concrete and has an embedded nut, but unlike the curling processing, it is not formed integrally with the receiving frame, so that a processing method in which centrifugal force is applied is possible. Then, it is possible to obtain a high quality opening body with increased strength.

[Brief description of drawings]

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

FIG. 2 is a front view, (b) is a left side view, and (c) is a plan view showing an inverted L-shaped member and a fixing bolt used in the same embodiment.

FIG. 3 is a plan view of the same embodiment.

FIG. 4 is a vertical sectional front view of a main part of a second embodiment of the present invention.

FIG. 5 is a plan view of another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional front view showing a conventional fixing structure of an opening main body of a box lid portion and a receiving frame.

[Explanation of symbols]

 10, 10b Receiving frame 11 Opening body 12, 12b Reverse L-shaped member 13 Fixing bolt 20 Lid 22 Inner diameter portion 23 Flange 24 Inner diameter portion 25 Support surface 27 Embedded nut 29, 29a Horizontal portion 30, 30a Vertical portion 31 Coupling bolt 37 long hole

Claims (3)

[Scope of utility model registration request] 1. In a lid receiving frame fixing structure such as a manhole in which a receiving frame of a lid is fixed to an upper part of a concrete opening body, the opening body has an upper surface formed as a receiving frame support surface, and the receiving frame is A flange portion is provided on the outer periphery of the lower portion and is placed in a positional relationship of being fixed on the support surface. Inverted L-shaped members each including a vertical portion formed so as to extend downward are provided at a plurality of positions, a plurality of embedded nuts are provided on an outer surface of the opening body, and the embedded nut is penetrated through the vertical portion. A lid receiving frame fixing structure for a manhole or the like, characterized in that a fixing bolt is screwed into the. 2. The lid receiving frame fixing structure for a manhole or the like according to claim 1, wherein the inverted L-shaped member has a penetrating portion of the fixing bolt formed in an elongated hole elongated in the vertical direction. 3. The inverted L-shaped member, wherein the horizontal portion and the vertical portion are formed separately, an outward extending portion is formed at an upper end portion of the vertical portion, and the horizontal portion is provided on the extending portion. The outer ends of the two are overlapped and connected by a connecting bolt penetrating both of them, and a portion through which the connecting bolt penetrates the lateral portion is formed as a long hole extending inward and outward in the opening body. The lid receiving frame fixing structure for a manhole or the like according to claim 1 or 2.