KR20140120097A

KR20140120097A - Manhole cover structure with plastic body

Info

Publication number: KR20140120097A
Application number: KR1020130035760A
Authority: KR
Inventors: 이혜옥; 박상희
Original assignee: 이혜옥; 박상희
Priority date: 2013-04-02
Filing date: 2013-04-02
Publication date: 2014-10-13

Abstract

The present invention relates to a manhole cover structure made of a synthetic resin material. Since the support pieces of the inner frame of the manhole cover are arranged so as to evenly divide the circumferential angle of the manhole cover, the load applied to the manhole cover is uniformly dispersed Since the body of the manhole cover is formed of a synthetic resin material, various colors and patterns can easily be formed, which can contribute to the enhancement of the aesthetic appearance of the city, and the manufacturing cost is reduced as compared with the conventional manhole.

Description

[0001] The present invention relates to a manhole cover structure,

The present invention relates to a manhole cover structure made of a synthetic resin material using synthetic resin as a material of a manhole cover for weight reduction and applying an inner frame having a plurality of support pieces stacked for strength reinforcement, load distribution and durability enhancement.

A manhole is a kind of passage that connects the upper and the sewer pipes or various kinds of ducts and other underground facilities to the ground. The manhole is generally composed of a reinforced concrete bath body having an upper iron opening and a manhole cover coupled to the opening.

The material of the manhole cover is mainly made of cast iron and usually manufactured through a casting. However, the material of the manhole cover is not only large in weight but also has a large cross section for securing strength.

In general, the manhole is located on the plane linear shape of the underground facilities, so that the installation position can not be limited according to the ground facilities, and the manhole cover coupled to the opening of the manhole is mass produced through standardization in order to reduce the construction cost and maintenance cost. As a result, it is practically impossible to apply manhole covers of different strength and dimensions to the installation point, so that the maximum load condition is applied at all times.

Therefore, in the case of a mass-produced manhole cover, it is inevitable that the weight of the manhole cover should be increased based on the maximum working load, such as the wheel load on the car.

Such a conventional manhole cover has a serious problem in various aspects such as a risk of safety accident due to heavy self weight during opening and closing.

In addition, since the material of the manhole cover, which is the primary color of the cast iron of dark color, can not only inhibit the beauty of the city, but also has low discrimination during night work, there are many difficulties in ensuring workability and safety.

Korean Patent Laid-Open No. 10-2010-0019291 is known as a conventional technique for a manhole cover.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an internal frame for reinforcing the inside of a lid while achieving economical cost and weight reduction by using a synthetic resin material, To provide a manhole cover structure made of a synthetic resin material.

The above and other objects can be accomplished by the provision of a base plate having a circular plate shape and a plurality of support pieces fixed to the base and each having a horizontal part and a vertical part, A manhole cover formed of a resin material body enclosing the manhole cover, a manhole cover provided with a seating part on which the manhole cover is seated around the circular opening, and a side flange formed on the periphery for burying on the ground, This is achieved by a manhole cover structure made of material.

In order to achieve the above object, the support pieces comprise a first support piece, a second support piece and a third support piece which evenly divide the circumferential angle with respect to the center of the manhole cover, And the second supporting piece and the third supporting piece are sequentially stacked with respect to the base, so that the first supporting piece, the second supporting piece and the third supporting piece are located at different heights of the respective horizontal parts desirable.

In addition, it is preferable that a fastening groove is formed at one circumference of the body portion, and a fastening protrusion inserted and fastened to the fastening groove of the body portion is formed inside the manhole cover.

Further, the manhole cover structure according to the present invention is characterized in that, among the first support piece, the second support piece, and the third support piece, the first support piece is formed at the uppermost portion of the manhole cover, It is preferable that the manhole cover receiving portion is embedded in the ground by determining the embedding direction of the manhole cover receiving portion.

According to the manhole cover structure made of a synthetic resin material according to the present invention, since the support pieces of the inner frame of the manhole cover are arranged to evenly divide the circumferential angle of the manhole cover, the load applied to the manhole cover is uniformly dispersed So that excellent structural strength can be maintained.

Also, the ability to resist the bending load is improved by the spaced structure between the base of the manhole cover and the support pieces, and the rigidity is excellent due to the laminated structure of the support pieces of the inner frame of the manhole cover, It is possible to minimize deformation.

In addition, since the body of the manhole cover is formed of a synthetic resin material, various colors and patterns can be easily formed, thereby contributing to an improvement in the appearance of the city.

The manhole cover structure according to the present invention is advantageous in that the manhole cover is made of a synthetic resin material, so that manufacturing cost is reduced as compared with a conventional metal manhole, and noise generated when the manhole cover is flowed is reduced.

1 is a perspective view showing a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention,
2 is a view showing the internal structure of a manhole cover of a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention,
3 is an exploded perspective view of a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention,
4 is a perspective view illustrating an inner frame forming a manhole cover of a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention,
FIG. 5 is a side view showing support pieces constituting the inner frame of FIG. 4,
FIG. 6 is a cross-sectional view of a manhole cover of a synthetic resin material according to a preferred embodiment of the present invention taken in a direction crossing a first support piece of a manhole cover,
7 is a schematic cross-sectional view illustrating a method of manufacturing a manhole cover of a synthetic resin material manhole cover structure according to a preferred embodiment of the present invention,
FIG. 8 is a cross-sectional view showing the cutaway portion AA 'of FIG. 2,
9 is a plan view showing an example of a pattern of a manhole cover of a synthetic resin material manhole cover structure according to a preferred embodiment of the present invention,
FIG. 10 is a diagram showing a comparison of the placement state of the first support pieces with the running direction of the road in the manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention,
11 is an exploded perspective view of a manhole cover structure made of a synthetic resin material according to another embodiment of the present invention,
12 is a view showing the internal structure of a manhole cover of a manhole cover structure made of a synthetic resin material according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, the construction of a synthetic resin manhole cover structure according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention, FIG. 2 is a view illustrating an inner structure of a manhole cover of a synthetic resin material manhole cover structure according to a preferred embodiment of the present invention And FIG. 3 is an exploded perspective view of a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention. FIG. 4 is an exploded perspective view of an inner frame forming a manhole cover of a synthetic resin- FIG. 5 is a side view showing supporting members constituting the inner frame of FIG. 4, FIG. 6 is a perspective view of a first supporting piece of a manhole cover of a synthetic resin material manhole cover according to a preferred embodiment of the present invention, Sectional view showing a cross section cut in the direction of traversal.

As shown in FIGS. 1 to 6, the synthetic resin manhole cover structure according to the present invention includes a manhole cover lid 1 buried in the upper surface of the manhole, and a manhole cover (not shown) mounted on the manhole cover lid 1 10).

The manhole cover 1 has a circular opening 3 formed by extending a side flange 2 in a lower end of a circumferential side surface thereof and having an inner side formed by a manhole (not shown) A wall 4 having a predetermined height is formed around the wall 4 and a seating part 5 having a stepped structure and an edge of the manhole cover 10 is seated on the inside of the wall 4. The wall 4 is formed with four fastening protrusions 7 for locking and fastening the manhole cover 10 to be described later to the manhole cover receiving portion 1 in a circumferentially symmetrical manner.

The manhole cover 10 includes a circular base 12 forming a lower portion and an inner frame 20 installed on an upper portion of the base 12 and a body 12 formed to surround the inner frame 20 above the base 12 (30).

The base 12 forms a lower part of the manhole cover 10 and has a circular plate structure made of a metal.

The inner frame 20 is formed by laminating a plurality of support pieces 21, 22, 23 having a bent shape with a constant width and having a "C" shape in cross section. The support piece comprises a horizontal portion 24 extending in a direction transverse to the manhole cover 10 and a vertical portion 25 bent downward from both ends of the horizontal portion 24. The three support pieces 21, 22 and 23 are composed of a first support piece 21, a second support piece 22 and a third support piece 23 from the top in the order in which they are stacked. The second support piece 22 is placed on the third support piece 23 and the first support piece 21 is placed on the second support piece 22, . At this time, the three support pieces are arranged such that the angle between adjacent support pieces 21, 22, 23 forms the same angle so as to evenly divide 360 degrees.

The lower ends of the vertical portions 25 of the first supporting piece 21, the second supporting piece 22 and the third supporting piece 23 are fixed to the base 12 and the first supporting piece 21, The length of each vertical portion 25 is gradually increased from the first supporting piece 21 to the third supporting piece 23 in a sequential manner since the second supporting piece 22 and the third supporting piece 23 have a laminated structure Is shortened. The first supporting piece 21, the second supporting piece 22 and the third supporting piece 23 of the inner frame 20 have a laminated structure with each other, (Not shown). The first supporting piece 21, the second supporting piece 22 and the third supporting piece 23 constituting the inner frame 20 are formed such that the horizontal portions 24, which are the portions to be laminated to each other, And the lower ends of the vertical portions 25 of the first support piece 21, the second support piece 22 and the third support piece 23 are also fixed to the base 12 by welding or the like . Accordingly, the first support piece 21, the second support piece 22 and the third support piece 23 are integrally joined to each other to form the inner frame 20, and the inner frame 20 is also attached to the base 12 So that the inner frame 20 and the base 12 are integrally fixed to each other.

The body 30 is formed by filling the upper surface of the base 12 and the inner frame 20 with a synthetic resin material. More specifically, the body 30 includes a base 12), filling the mold with a resin melt, and solidifying the resin melt. The synthetic resin material of the body portion 30 may be selected from a variety of materials including urethane, polyester, polypropylene, PVC, ABS, FRP, and aramid fibers. An inorganic material such as a stone can be added as an additive material.

A fastening groove 32 for fastening the fastening protrusion 7 of the manhole cover receiving unit 1 to the fastening protrusion 7 is formed at a position corresponding to the fastening protrusion 7 on one side of the body 30. When the manhole cover 10 is seated on the manhole cover receiving portion 1 with the engaging groove 32 of the manhole cover 10 aligned with the engaging projection 7 of the manhole cover receiving portion 1, When the manhole cover 7 is inserted into the engaging groove 32 and then the manhole cover 10 is rotated to move the engaging projection 7 to the inside of the engaging groove 32, And is not lifted up.

A method of manufacturing the manhole cover 10 in the manhole cover structure made of a synthetic resin material according to the present invention is as follows.

7 is a schematic cross-sectional view showing a mold apparatus for manufacturing a manhole cover of a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention.

7, a base 12 to which an inner frame 20 is fixed is placed on a mold 40 (or a mold) having a shape corresponding to the outer shape of the manhole cover 10, and a resin melt is poured on the base 12 When the resin melt is solidified while covering the rear lid 45, the body 30 is formed to be integral with the inner frame 20 and the base 12.

Since the body 30 is filled between the horizontal portion 24 of the inner frame 20 and the base 12, the body 30, the inner frame 20 and the base 12 are integrally joined to each other Structure.

The manhole cover lid 1 can be made of metal or synthetic resin. In case of metal, the manhole cover lid 1 can be manufactured by various methods including casting. In the case of synthetic resin, it can be manufactured by various methods such as injection molding.

Hereinafter, the operation and effect of the manhole cover structure made of the synthetic resin material according to the preferred embodiment of the present invention will be described.

1. Circumferential equalization of the support piece

2 and 6, a manhole cover 10 of a manhole cover structure made of a synthetic resin material according to the present invention includes a vertical portion 25 of the support pieces 21, 22, and 23 of the inner frame 20, And a lower end of the vertical part 25 is fixed to the base 12. [

The support pieces 21, 22 and 23 of the inner frame 20 equally divide the circumferential angle of 360 degrees in the circumferential direction with respect to the center of the circular base 12. The first supporting piece 21, the second supporting piece 22 and the third supporting piece 23 of the inner frame 20 form a laminated structure in the vertical direction. When a load is applied to the upper surface of the manhole cover 10, the load is transmitted to the horizontal portion 24 of the first supporting piece 21 of the inner frame 20, The load is transmitted to the horizontal portion 24 of the second support piece 22 and then the load is transmitted to the horizontal portion 24 of the third support piece 23 located below the second support piece 22. That is, the load applied to the upper surface of the manhole cover 10 is transmitted to the inner frames 20 inside the manhole cover 10 via the body 30, The second supporting piece 22 and the third supporting piece 23 are arranged so as to evenly divide the peripheral circumferential angle of the manhole cover 10 so that the first supporting piece 21, The load is uniformly dispersed in the entire circumferential direction of the manhole cover 10 by the second support member 22 and the third support member 23. [

Specifically, the first supporting piece 21 of the inner frame 20 positioned at the uppermost portion of the manhole cover 10 receives the load for the first time in the inner frame 20. [ At this time, the first support piece 21 receives a bending moment in the direction in which the horizontal part 24 extends, so that the extension direction of the horizontal part 24 of the first support piece 21 is A reference bending may occur. However, since the first support piece 21 is fixed to the second support piece 22 and the second support piece 22 is fixed to the third support piece 23, the load applied to the first support piece 21 The load is dispersed in the circumferential direction without concentrating the load in any one direction because the second support piece 22 and the third support piece 23 are dispersed.

2. Separated structure of base and support pieces

2 and 6, in the manhole cover structure of the synthetic resin material according to the present invention, the inner frame 20 is fixed to the base 12 positioned at the lower portion of the manhole cover 10, And has a structure in which the horizontal portions 24 of the first support piece 21, the second support piece 22 and the third support piece 23 are fixed to the base 12 so as to be positioned apart from the base 12.

The manhole cover 10 according to the present invention has a structure in which the supporting pieces of the base 12 and the inner frame 20 are spaced apart from each other so that when a heavy load is applied to the manhole cover 10, The occurrence of bending deformation can be minimized. This is because the horizontal part 24 such as the first supporting piece 21 of the inner frame 20 and the base 12 are integrally fixed to each other and the first supporting piece 21 of the inner frame 20, Since the horizontal portions 24 of the first support member 22 and the third support member 23 are spaced apart from the base 12 by a distance, the moment of inertia, which is a moment against bending, is large. Therefore, even when a heavy load is applied to the manhole cover 10, bending deformation does not occur.

Since the first support piece 21, the second support piece 22 and the third support piece 23 of the inner frame 20 are arranged so as to evenly divide the circumferential angles of the manhole cover 10, The moment of the beam has a large value in any direction, so that it has a large bending resistance regardless of the load acting in any direction.

3. Laminated structure of support

8 is a cross-sectional view showing an incision taken along the line A-A 'in Fig.

Since the edge of the manhole cover 10 is supported by the seating portion 5 of the manhole cover 1 as shown in Figs. 2, 4 and 8, the bending deformation Becomes the largest when a load is applied to the central portion. That is, as the load is applied to the point far from the supporting point when the beam is subjected to the lateral load, the deflection of the beam is large. In the present invention, since the structure of the inner frame 20 is an area in which the three support pieces are superimposed on the central part of the manhole cover 10, the sectional area of the beam with respect to the load applied to the center part of the manhole cover 10 is three Sectional areas of the pieces. Therefore, the three support pieces 21, 22, and 23 are stacked at three different height positions in the height direction by stacking the first support piece 21, the second support piece 22 and the third support piece 23 Sectional area directly related to the bending behavior of the inner frame 20 when the load is applied to the manhole cover 10 in the vertical direction is the sum of the cross sectional areas of the three support pieces 21, Therefore, when the load is applied to the manhole cover 10, the manhole cover 10 hardly bends because the moment of inertia becomes larger due to the structure in which the three support pieces 21, 22, 23 are laminated.

4. Separate locking device for light weight

The synthetic resin manhole cover structure according to the present invention has a smaller weight than the conventional manhole cover 10 because the material of the body portion 30, which occupies most of the manhole cover 10, is synthetic resin material. Therefore, there is a possibility that when the impact is applied to the manhole cover 10, the manhole cover 10 is lifted and dropped off. When the manhole cover 10 is lifted up, the entrance of the manhole is opened and a person or an object falls into a manhole and an accident may occur.

In order to prevent this, a manhole cover structure made of a synthetic resin material according to the present invention is characterized in that, as shown in FIG. 1, a fastening groove 32 is formed in the manhole cover 10 and fastening protrusions 7 And the manhole cover 10 is rotated to be engaged with the manhole cover receiving portion 1. Accordingly, the manhole cover 10 can be prevented from being separated from the manhole cover 10 even if an impact is applied to the manhole cover 10 because the manhole cover 10 is fixedly coupled to the manhole cover.

5. Implementation of various designs

Since the conventional manhole cover 10 is a cast iron manufactured by the casting method, the appearance is uniform and the color can not be diversified, so that it is difficult for the improvement of the city aesthetic appearance to respond.

However, since the synthetic resin manhole cover structure according to the present invention is made of a synthetic resin material outside the manhole cover 10, various colors can be realized using dyes. As shown in FIG. 9, So that it is possible to contribute to the improvement of the beauty of the city by designing various designs according to the characteristics of the place where the manhole cover 10 is installed.

6. Reduction of noise

The conventional manhole cover 10 made of cast iron is heavy in weight and when the vehicle passes over the manhole cover 10, the manhole cover 10 is moved by a heavy load to generate noise.

However, since the synthetic resin material of the body portion 30 of the manhole cover 10 is made of synthetic resin, the synthetic resin manhole cover structure according to the present invention can prevent the noise generated when the manhole cover 10 hits the manhole cover receiving portion 1 There is a remarkable reduction effect.

As described above, since the manhole cover 10 and the manhole cover receiving portion 1 are coupled to each other by the engaging groove 32 and the fastening protrusion 7, the manhole cover 10 can be mounted on the manhole cover 1 The noise generated due to the flow of the manhole cover 10 is remarkably reduced.

7. Identify the direction of the first support piece

FIG. 10 is a view showing a comparison of arrangement states of first support pieces with running direction of a road in a manhole cover structure made of a synthetic resin material according to a preferred embodiment of the present invention.

10A, the manhole cover 10 according to the present invention is constructed such that the first supporting piece 21 located at the uppermost portion of the inner frame 20 is disposed perpendicular to the running direction P of the road do. The reason why the first supporting piece 21 is disposed at a specific position is that the manhole cover 10 and the manhole cover receiving portion 1 are coupled by the coupling groove 32 and the coupling protrusion 7, The position of the manhole cover 10 coupled thereto is specified when the position of the lid support part 1 is specified and at the same time the position of the first support piece 21 is defined with reference to the engaging groove 32 of the manhole cover 10 The first supporting piece 21 of the manhole cover 10 can be disposed perpendicular to the running direction P of the road so that the direction of the bottom of the manhole cover 1 have.

10A, the first support piece 21 of the inner frame 20 of the manhole cover 10 is inserted into the manhole cover 10 in the direction perpendicular to the running direction P of the road, The wheels F of the vehicle are always positioned on the inner frame 20 even when the wheels of the vehicle pass over the upper area w1 of the manhole cover 10, Of the first support piece 21 of the first support piece 21 of FIG. That is, when the first support piece 21 is arranged perpendicular to the running direction P of the road in the manhole cover 10, the load is always transmitted to the first support piece 21.

As a result, the load applied to the manhole cover 10 is always transmitted to the first support piece 21, and the load transmitted to the first support piece 21 is transmitted to the second support piece 22 and the third support piece 23, The first support piece 21, the second support piece 22, and the third support piece 23 all share the load, so that the load concentration can be dispersed.

If the first support piece 21 of the manhole cover 10 is disposed in parallel with the running direction P of the road as shown in FIG. 10B, When the wheels pass, the vehicle wheel may pass through the area where the first support piece 21 of the manhole cover 10 is offset. In this case, since the vehicle wheel passes over the second support piece 22 and the third support piece 23, the second support piece 22 and the third support piece 23 are heavily loaded, The fixing of the second supporting piece 22 to the first supporting piece 21 may be broken. That is, when the second support piece 22 pulls the first support piece 21 from below, the fixing of the first and second support pieces 21 and 22 is weakened, . If the fixed part of the first supporting piece 21 and the second supporting piece 22 are separated and separated from each other, if the vehicle wheel passes over the second supporting piece 22 and the third supporting piece 23 The first support piece 21 may not be able to appropriately share the load.

In order to prevent this, the first support piece 21 of the manhole cover 10 is arranged to be perpendicular to the running direction of the road, so that the first support piece 21 always receives the load, 21, the second support piece 22 and the third support piece 23 are deformed downward so that the first support piece 21, the second support piece 22 and the third support piece 23 So that a fixed state is maintained.

8. Decrease in manufacturing cost

Metal materials are more expensive than synthetic resin materials. Therefore, it is most economical to ensure structural strength while minimizing metal parts. The inner frame 20 is composed of three support pieces and the support pieces 21, 22 and 23 are formed on the base 12 in order to minimize the metal material while improving the structural strength of the manhole cover 10. [ So that the moment of inertia of the cross section is increased.

FIG. 11 is an exploded perspective view of a manhole cover structure made of a synthetic resin material according to another embodiment of the present invention, and FIG. 12 is a view illustrating an inner structure of a manhole cover of a synthetic resin material manhole cover structure according to another embodiment of the present invention .

11 and 12, the manhole cover structure made of a synthetic resin material according to another embodiment of the present invention is the same as the structure of the preferred embodiment shown in FIGS. 1 to 10 in other respects, .

The inner frame 120 of the manhole cover 10 applied to the manhole cover structure according to another embodiment of the present invention is a structure having a plurality of vertical support pieces 121 that are radially extended in a vane shape and have bent ends.

Since the vertical support pieces 121 of the inner frame 120 are vertically erected and have a large moment of inertia, the bending deformation against the load applied to the manhole cover is very small, which is suitable for supporting a large load.

In the preferred embodiment of the present invention, three support pieces 21, 22, and 23 of the inner frame 20 have been described. However, the present invention is not limited thereto and four or more support pieces may be formed Do.

Although the materials of the manhole cover and the manhole cover are described as examples in the above embodiments of the present invention, the present invention is not limited thereto. Various materials suitable for the purpose of the present invention can be manufactured and used in various manners . For example, artificial marble for expressing the beauty of marble as a material of a manhole cover, concrete for the purpose of harmonization with the road in appearance, and composite concrete containing glass fiber for strength reinforcement at the same time, And the like can be used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And additions should be considered as falling within the scope of the claims of the present invention.

1 manhole cover, 2 side flanges, 4 walls, 7 fastening projections, 10 manhole cover, 12 base, 20 inner frame, 21 first support piece, 22 second support piece, 23 third support piece, 30 body part, 32 fastening groove

Claims

A circular plate-shaped base;
A plurality of support pieces fixed to the base and each having a horizontal portion and a vertical portion, the plurality of support pieces being disposed by dividing the circumferential angle of the base uniformly; And
A manhole cover formed of a resin material body surrounding the base and the support pieces,
And a manhole cover support portion formed with a seating portion on which the manhole cover is seated is formed around a circular opening portion and a side flange is formed around the periphery for burying on the ground.

2. The manhole cover according to claim 1, wherein the support pieces comprise a first support piece, a second support piece and a third support piece that evenly divide the circumferential angle with respect to the center of the manhole cover,
The first supporting piece, the second supporting piece, and the third supporting piece are sequentially laminated on the base, so that the first supporting piece, the second supporting piece, Wherein the manhole covers are located at different heights.

3. The manhole cover according to claim 2, wherein a coupling groove is formed at a circumferential side of the body portion, and a fastening protrusion inserted and fastened to the coupling groove of the body portion is formed inside the manhole cover .

The method of claim 3,
Wherein the first supporting piece is formed at the uppermost portion of the manhole cover,
Wherein the manhole cover receiving portion is embedded in the ground by determining the embedding direction of the manhole cover receiving portion so that the first supporting piece of the manhole cover is perpendicular to the road direction.