WO2007026976A1

WO2007026976A1 - Manhole

Info

Publication number: WO2007026976A1
Application number: PCT/KR2005/002908
Authority: WO
Inventors: Jaeduk Lee
Original assignee: Jaeduk Lee
Priority date: 2005-09-01
Filing date: 2005-09-01
Publication date: 2007-03-08

Abstract

The present invention provides a manhole in which a spiral rib (204), which is provided on the circumferential outer surface of an upper body (200) on which a manhole cover (300) is placed, is seated onto and supported by a spiral rib (108) provided on the circumferential inner surface of the lower body (100). Furthermore, in the present invention, the spiral ribs have saw- toothed parts which engage with each other, so that the upper body can be reliably supported by the lower body. Therefore, each rib can have a sufficiently large pitch, thus making it possible to rotate the upper body with respect to the lower body in a state in which the ribs do not contact each other. Thereby, the vertical position of the manhole cover can be easily adjusted.

Description

Description MANHOLE

Technical Field

[1] The present invention relates to a manhole.

Background Art

[2] In the case where additional asphalt is applied to an existing road, the height of the road surface is increased. To accommodate this, the height of manholes must be adjusted. Several means for adjusting the height of manholes have been proposed.

[3] For example, a means for adjusting the level of an upper part of a manhole support structure using a spiral thread engagement was proposed in Korean Patent Laid-open Publication No. 10-2004-7758.

[4] However, the conventional technique can be applied to a relatively light manhole made of synthetic resin but cannot be applied to a roadway manhole made of steel. That is, the upper body of the steel manhole is too heavy and large to maintain the position thereof using the spiral thread engagement structure. For example, in the case of a small nut and a small bolt, the bolt can maintain its position with respect to the nut by virtue of the engagement between the internal thread of the nut and the external thread of the bolt. However, because the manhole has a diameter of several tens of cm and a weight of approximately 100 kg, it is difficult to maintain the height of the manhole using only the engagement between an internal thread and an external thread which are formed on the circumferential surfaces. Furthermore, it is very difficult to rotate the upper body of the manhole, unlike the case of the engagement of the small nut and bolt.

Disclosure of Invention Technical Problem

[5] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a manhole in which an upper body is supported by a lower body using a structure such that a spiral rib, which is provided on the circumferential outer surface of the upper body on which a manhole cover is placed, is seated onto and supported by a spiral rib provided on the circumferential inner surface of the lower body, and in which the spiral ribs have respective saw-toothed parts constructed such that the saw-toothed part provided under the spiral rib of the upper body engages with the saw-toothed part provided on the spiral rib of the lower body, and each spiral rib has a pitch large enough for the upper body to be easily rotated with respect to the lower body and to be reliably supported by the lower body without sliding relative to the lower body. [6] Another object of the present invention is to provide a manhole which is easily adjustable in height. Technical Solution

[7] In order to accomplish the above objects, the present invention provides a manhole, comprising a lower body (100), including a hollow pipe (106) having a lower spiral rib on a circumferential inner surface thereof, an upper body (200), including a hollow pipe having an upper spiral rib (204) on a circumferential outer surface thereof, and a manhole cover support (202) provided on an upper end of the upper body. The lower spiral rib (108) provided in the lower body includes a saw-toothed part having a regularly repeating shape, and the upper spiral rib (204) provided on the circumferential outer surface of the upper body includes, under a lower surface thereof, a saw- toothed part, which has a regularly repeating outline corresponding to an outline of the saw-toothed part of the lower spiral rib (108) provided on the circumferential inner surface of the lower body, so that the upper body is supported on the lower body by engagement between the saw-toothed part of the lower spiral rib of the lower body and the saw-toothed part of the upper spiral rib of the upper body.

[8] Thus, the following effects are achieved.

Advantageous Effects

[9] To solve the problems with the conventional technique, the present invention is constructed such that a spiral rib, which is provided on the circumferential outer surface of an upper body on which a manhole cover is placed, is seated onto and supported by a spiral rib provided on the circumferential inner surface of a lower body, and the spiral ribs have respective saw-toothed parts which engage with each other, so that the upper body can be reliably supported by the lower body. Therefore, in the present invention, each rib can have a sufficiently large pitch, thus making it possible to rotate the upper body with respect to the lower body in the state in which the ribs do not contact each other.

[10] Furthermore, despite the structure such that the upper body can be easily rotated, the upper body is reliably supported by the lower body without sliding, because the upper and lower bodies are coupled to each other by engagement between their saw- toothed parts.

[11] In addition, the present invention has an advantage in that the height of the manhole can be easily adjusted. Brief Description of the Drawings

[12] FIG. 1 is an exploded perspective view illustrating the assembly of an embodiment of the present invention;

[13] FIG. 2 is a schematic sectional view of the embodiment of the present invention; and

[14] FIG. 3 is another schematic sectional view of the embodiment of the present invention. Best Mode for Carrying Out the Invention

[15] The present invention relates, in general, to manholes and, more particularly, to a manhole, comprising a lower body (100), including a hollow pipe (106) having a lower spiral rib on a circumferential inner surface thereof, an upper body (200), including a hollow pipe having an upper spiral rib (204) on a circumferential outer surface thereof, and a manhole cover support (202) provided on an upper end of the upper body. The lower spiral rib (108) provided in the lower body includes a saw-toothed part having a regularly repeating shape, and the upper spiral rib (204) provided on the circumferential outer surface of the upper body includes, under a lower surface thereof, a saw- toothed part, which has a regularly repeating outline corresponding to an outline of the saw-toothed part of the lower spiral rib (108) provided on the circumferential inner surface of the lower body, so that the upper body is supported on the lower body by engagement between the saw-toothed part of the lower spiral rib of the lower body and the saw-toothed part of the upper spiral rib of the upper body.

[16] Preferably, a pitch of each of the upper spiral rib (204) and the lower spiral rib

(108) may be greater than a sum of a thickness of the upper spiral rib (204) and a thickness of the lower spiral rib (108), such that the upper body is rotated with respect to the lower body without contact between the upper spiral rib (204) provided in the upper body and the lower spiral rib (108) provided in the lower body. Furthermore, it is preferable that the saw-toothed part provided in each of the upper and lower spiral ribs of the upper and lower bodies have a predetermined repeated pattern.

[17] Preferably, a plurality of bolt holes (206) may be formed through the upper body, and bolts (208) may be fastened into the bolt holes (206), thus preventing the upper body from moving in a transverse direction. Furthermore, each of the upper spiral rib (204) of the upper body and the lower spiral rib (108) of the lower body may have a round part on an upper surface or under a lower surface thereof. Mode for the Invention

[18] Hereinafter, the present invention will be described in detail with reference to the attached drawings.

[19] FIG. 1 is a view showing a manhole according to an embodiment of the present invention. The manhole includes a lower body 100 and an upper body 200. The lower body is supported on a bottom structure. To firmly fix the lower body at a desired position, it is preferable that the lower body be supported on a manhole slab structure 101 made of concrete, as shown in FIG. 1. As such, to firmly support the lower body on the manhole slab structure, separate reinforcing members, such as a fastening plate 102 and a reinforcing plate 104, are provided around the lower body.

[20] The lower body includes a hollow pipe 106. The hollow pipe 106 has a spiral rib

108 on the circumferential inner surface thereof. That is, the spiral rib is provided around the circumferential inner surface of the hollow pipe to form a spiral shape.

[21] The manhole of the present invention is constructed by supporting the upper body

200 on the lower body 100 having the above-mentioned structure. In detail, the upper body 200 having a hollow pipe shape is supported by the lower body. A manhole cover support 202, on which a manhole cover 300 is placed, is provided on the upper end of the upper body. Therefore, the vertical position of the upper body determines the vertical position of the manhole cover. Meanwhile, the upper body 200 has a spiral rib 204 on the circumferential outer surface thereof. That is, the spiral rib 204 is provided around the circumferential outer surface of the upper body to form a spiral shape. The spiral rib 204 of the upper body is placed and supported on the spiral rib 108 provided on the circumferential inner surface of the lower body, so that the upper body can be supported by the lower body.

[22] FIG. 2 is a schematic view of the embodiment of the present invention. The right view of FIG. 2 is a schematic view showing a section of a portion of the manhole. The left view of FIG. 2 is a partially broken perspective view. The upper rib 204 provided on the circumferential outer surface of the upper body is placed on and supported by the lower rib 108 provided on the circumferential inner surface of the lower body. In the present invention, saw-toothed parts, corresponding to each other, are respectively provided on the upper surface of the lower rib and under the lower surface of the upper rib, so that, although the pitch of the ribs is relatively large, the upper rib is prevented from sliding with respect to the lower rib. Preferably, the saw-toothed part, which has the regularly repeating shape, is provided on the upper surface of the spiral rib of the lower body. Furthermore, the saw-toothed part, which has a regularly repeating outline corresponding to the outline of the saw-toothed part of the lower rib, is provided under the lower surface of the spiral rib of the upper body which faces the saw-toothed part of the upper rib. Therefore, because the saw-toothed parts are provided on the contact surfaces of the upper rib and the lower rib, which engage with each other, the upper rib is prevented from sliding downwards with respect to the lower rib.

[23] As such, because each rib is constructed such that individual saw-teeth having the s ame shape are repeatedly arranged, when the upper body is rotated at a predetermined angle to adjust the vertical position of the upper body, the vertical position of the upper body is changed by an integer multiple of a unit value. Of course, such a structure markedly facilitates the operation of adjusting the vertical position of the upper body.

[24] Meanwhile, for the manhole, a relatively large load is applied to the spiral ribs. To withstand the load, as shown in the sectional view of FIG. 2, it is preferable that round parts 109 and 205 be respectively formed under the rib 108 of the lower body and on the rib 204 of the upper body, thus increasing the durability of the ribs.

[25] Furthermore, preferably, a plurality of bolt holes 206 is formed through the upper body, and bolts 208 are fastened into the bolt holes 206, so that the upper body is more reliably fastened to the lower body by the bolts 208, and the upper body is prevented from moving in a transverse direction with respect to the lower body.

[26] In the present invention, as the vertical position of the upper body may be changed, a gap may be formed between the upper body and the lower body. In this case, a cover ring, which is made of synthetic resin and shown by the reference numeral 212 of FIG. 2, is placed in the gap, thus preventing foreign substances, such as soil, from entering the manhole.

[27] Meanwhile, it is preferable that the pitch of the spiral ribs be sufficiently large, such that, as shown in FIG. 3, the upper body can be lifted from the lower body, can be rotated in one direction in the state in which the spiral rib 108 of the lower body and the spiral rib 204 of the upper body are not in contact with each other, and can be lowered onto the lower body, thus adjusting the vertical position of the upper body. In other words, unlike a typical thread engagement, it is preferable that the spiral ribs have a pitch (designated by P of FIG. 2) sufficient to make it possible to rotate the upper body without bringing the ribs into contact with each other. For this, the pitch P of each spiral rib must be greater than the sum of the thicknesses of the upper rib and the lower rib.

[28] For a manhole structure having a weight of approximately 100 kg, if each spiral rib has a relatively small pitch in the same manner as that of a typical thread engagement, so that the ribs closely engage each other when the upper body and the lower body are coupled to each other, it is in theory possible to achieve the intended purpose of the present invention, but it is almost impossible in practice to achieve the intended purpose because it is very difficult to rotate the upper body with respect to the lower body in the state in which the pitch of each spiral rib is small so that the spiral ribs closely engage with each other. In the present invention, the pitch of each spiral rib is relatively large, unlike that of the typical thread engagement. Preferably, the upper body and the lower body are coupled to each other using the spiral ribs, each of which has a pitch greater than the sum of the thickness of the upper rib and the thickness of the lower rib. Therefore, as shown in FIG. 3, when the upper body is lifted upwards such that the spiral ribs do not contact each other, the upper body can be easily rotated.

[29] Of course, because the saw-toothed parts are provided on the spiral ribs 108 and

204, although the pitch P of the spiral ribs is relatively large, the upper body is prevented from sliding downwards with respect to the lower body. Industrial Applicability

[30] As described above, the present invention provides a manhole in which an upper body is supported by a lower body using a structure such that a spiral rib, which is provided on the circumferential outer surface of the upper body on which a manhole cover is placed, is seated onto and supported by a spiral rib provided on the circumferential inner surface of the lower body, and in which the spiral ribs have respective saw-toothed parts such that the saw-toothed part provided under the spiral rib of the upper body engages with the saw-toothed part provided on the spiral rib of the lower body, and each spiral rib has a pitch large enough for the upper body to be easily rotated with respect to the lower body and to be reliably supported by the lower body without sliding downwards.

Claims

[1] A manhole, comprising: a lower body (100), comprising a hollow pipe (106) having a lower spiral rib on a circumferential inner surface thereof, an upper body (200), comprising a hollow pipe having an upper spiral rib (204) on a circumferential outer surface thereof, and a manhole cover support (202) provided on an upper end of the upper body, wherein the lower spiral rib (108) provided in the lower body comprises a saw-toothed part having a regularly repeating shape, and the upper spiral rib (204) provided on the circumferential outer surface of the upper body comprises, under a lower surface thereof, a saw-toothed part, which has a regularly repeating outline corresponding to an outline of the saw-toothed part of the lower spiral rib (108) provided on the circumferential inner surface of the lower body, so that the upper body is supported on the lower body by engagement between the saw-toothed part of the lower spiral rib of the lower body and the saw-toothed part of the upper spiral rib of the upper body.

[2] The manhole according to claim 1, wherein a pitch of each of the upper spiral rib

(204) and the lower spiral rib (108) is greater than a sum of a thickness of the upper spiral rib (204) and a thickness of the lower spiral rib (108), such that the upper body is rotated with respect to the lower body without contact between the upper spiral rib (204) provided in the upper body and the lower spiral rib (108) provided in the lower body.

[3] The manhole according to claim 1 or 2, wherein the saw-toothed part provided in each of the upper and lower spiral ribs of the upper and lower bodies has a predetermined repeated pattern.

[4] The manhole according to claim 1 or 2, wherein a plurality of bolt holes (206) is formed through the upper body, and bolts (208) are fastened into the bolt holes (206), thus preventing the upper body from moving in a transverse direction.

[5] The manhole according to claim 1 or 2, wherein each of the upper spiral rib

(204) of the upper body and the lower spiral rib (108) of the lower body has a round part on an upper surface or under a lower surface thereof.