KR100877322B1 - Method for manufacturing a assembly type manhole with complex function and assembly type manhole with complex function using the same - Google Patents

Abstract

A manufacturing method of a prefabricated composite manhole and a prefabricated composite manhole manufactured by the same are provided to prevent the separation of each structural element of a manhole and to improve stability and assemblability. A manufacturing method of a prefabricated composite manhole comprises the steps of manufacturing a manhole main body by welding an inflow pipe and an outflow pope water-tightly(S1), installing a prefabricated inverter by connecting a prefabricated inverter to the inside of the manhole main body(S2), arranging reinforcing bars by forming a bar arrangement unit formed by arranging reinforcing bars to intersect at regular intervals on the lower part of the manhole main body(S3), installing a form of the shape of a lower fixing plate to be formed on the lower part of the manhole main body(S4), placing and curing concrete on the lower part of the manhole main body and the form through a concrete placing hole of the prefabricated inverter and removing the form, thereby manufacturing a lower fixing plate(S5), assembling an upper plate to the uppermost end of the manhole main body(S6), assembling a height adjustment unit having the appointed height along the outside of an entrance of the upper plate(S7), and assembling a support frame to the upper part of the height adjustment unit(S8).

Description

Method of manufacturing a prefabricated composite manhole and a prefabricated composite manhole manufactured by the same method {method for manufacturing a assembly type manhole with complex function and assembly type manhole with complex function using the same}

The present invention has an inlet pipe and an outlet pipe to the manhole body side, the support frame is connected to the upper manhole cover manhole cover, the manhole body manufacturing process (S1); Prefabricated inverter installation process (S2); Reinforcement step (S3); Formwork installation process (S4); Concrete pouring and curing process (S5); Top plate assembly process (S6); Height adjusting unit assembly process (S7); The lower fixing plate supporting the manhole body to the bottom through each step of the support frame assembly process (S8) is integrally formed with the manhole body and the prefabricated inverter inside the manhole body, and the upper plate, the height and the slope between the manhole body and the support frame are adjusted. Is connected to the height adjuster in turn, to prevent the separation of each manhole component, to improve stability and assembling, relates to a prefabricated composite manhole, characterized in that the manhole cover and the road surface.

As is well known, urban concentration of the population is accelerated due to industrial development and urbanization, and as the industrial base is reorganized around the city, facilities such as water and sewage, communication lines, or gas pipelines connected to the city as a whole. The underground is buried underground, and for the maintenance and repair of various facilities, the pipe can be exposed to the set area such as the change of the diameter, the direction of change, the middle of the long straight part, and the role of the passage for human access. Manholes are also installed to perform.

The manhole has a form in which the inlet pipe and the outlet pipe are connected to the lower portion of the tube having a lid in a cylindrical shape, respectively, which is embedded, and has a manhole body to which a plurality of inlet and outlet pipes are connected to the lower side. The support frame is connected to the upper part of the manhole body, and has a form of seating and covering the manhole cover to the upper support frame.

The manhole formed in this way is buried underground, and when the manhole is not used, it is blocked by the manhole cover to protect the inside of the manhole from the outside, or to prevent rainwater and sewage backflow. Due to the vibration or shock and other factors, the separation of each component of the manhole occurs, resulting in the flow and breakage of the manhole.

In addition, the manhole cover installed on the roadway causes the road surface of the repaved road to be higher or lower than the height of the manhole cover when the road is repaved, resulting in unevenness of the road surface, and thus the accident caused by the road unevenness. There was a risk of occurring.

In order to prevent this, in the past, the manhole frame buried in the road was dug up and adjusted to a new height, but this was very cumbersome and required a lot of work manpower and construction time.

Therefore, the present invention has been invented to solve the above problems, the upper part of the manhole body is connected to the upper plate for absorbing the shock, and the height adjuster to match the height of the road surface and the manhole cover in order; In the lower part of the manhole body, a lower fixing plate supporting the manhole body constitutes a prefabricated manhole formed integrally with the manhole body and the prefabricated inverter, thereby preventing separation of each component of the prefabricated manhole and improving stability and assemblability. At the same time, the purpose of manufacturing a prefabricated composite manhole and a prefabricated composite manhole manufactured thereby to match the manhole cover and the road surface to prevent accidents.

The present invention for solving the above problems, the manhole body manufacturing process (S1); Prefabricated inverter installation process (S2); Reinforcement step (S3); Formwork installation process (S4); Concrete pouring and curing process (S5); Top plate assembly process (S6); Height adjusting unit assembly process (S7); The lower fixing plate supporting the manhole body to the bottom through each step of the supporting frame assembly process (S8) is integrally formed with the manhole body and the prefabricated inverter inside the manhole body, and the upper plate made of concrete and the predetermined height between the manhole body and the supporting frame And, the upper surface constitutes a prefabricated composite manhole connected in sequence with the height control having the same slope as the road surface.

Through this, the cast concrete is manufactured with the lower fixing plate formed integrally with the manhole body and the prefabricated inverter, so that it is more stably supported on the floor, prevents the corrosion of the concrete, and the manhole cover is raised by the height adjusting part. It is provided with the same slope to prevent unevenness on the road surface, which prevents accidents and improves safety, and the upper plate absorbs the vibration and shock applied to the manhole to prevent the flow and departure of the manhole body, inlet and outlet pipes. And, each of these components are easily assembled and fastened to improve the assemblage has the effect of making the installation of the manhole more easily.

The present invention has an inlet pipe and an outlet pipe to the manhole body side, the support frame is connected to the upper manhole cover manhole cover, the manhole body manufacturing process (S1); Prefabricated inverter installation process (S2); Reinforcement step (S3); Formwork installation process (S4); Concrete pouring and curing process (S5); Top plate assembly process (S6); Height adjusting unit assembly process (S7); The lower fixing plate supporting the manhole body to the bottom through each step of the support frame assembly process (S8) is integrally formed with the manhole body and the prefabricated inverter inside the manhole body, and the upper plate, the height and the slope between the manhole body and the support frame are adjusted. Is connected to the height adjuster in turn, to prevent the separation of each manhole component, to improve stability and assembling, relates to a prefabricated composite manhole, characterized in that the manhole cover and the road surface.

Referring to the present invention, the manhole body manufacturing process (S1) for cutting the height to fit the position to be constructed, through the lower portion of the manhole body to connect the inlet and outlet pipes; A prefabricated inverter installation process (S2) for installing a prefabricated inverter inside the manhole body; A reinforcement step (S3) for reinforcing the reinforcement to the bottom of the manhole body; Formwork installation process (S4) for installing the formwork to the lower portion of the manhole body; A concrete placing and curing process (S6) for manufacturing a lower fixing plate by placing and curing concrete in a formwork through a prefabricated inverter; An upper plate assembly step (S6) of assembling the upper plate to the upper portion of the manhole body; A height adjusting unit assembly step (S7) of assembling the height adjusting unit to the upper plate; By constructing a prefabricated complex manhole manufactured through each step of the support frame assembly step (S8) for assembling the support frame seating the manhole cover to the upper part of the height adjustment, the cast concrete is formed integrally in the manhole body and the prefabricated inverter It is made of fixed plate and connected to the floor to support the floor more stably, to prevent corrosion of concrete, and the manhole cover is provided with the same height and inclination of the road surface by the height adjustment part to prevent unevenness on the road surface. It prevents accidents and improves safety, and absorbs vibrations and shocks applied to the manhole to prevent the flow and departure of the manhole body, inlet and outlet pipes, and each of these components can be easily assembled and fastened Improves, making installation of manholes easier.

The prefabricated composite manhole according to the present invention, which is configured as described above and is easily installed in a short time in the ground and improves stability, will be described in more detail with reference to the embodiments shown in the drawings.

In order to manufacture the present inventors prefabricated composite manhole (1) as shown in Figure 1 manhole body manufacturing process (S1); Prefabricated inverter installation process (S2); Reinforcement step (S3); Formwork installation process (S4); Concrete pouring and curing process (S5); Top plate assembly process (S6); Height adjusting unit assembly process (S7); It is manufactured through each step of the support frame assembly step (S8), looking at this manufacturing process in detail, first, the manhole body manufacturing step (S1), as the manhole body 10 to be manufactured to be suitable for the place where the manhole will be constructed, As shown in FIG. 2 or FIG. 3, the manhole body 10 having a predetermined length of hollow cylindrical tube shape is cut to have an appropriate height, and then penetrated through the lower side to enter the manhole body 10. (11) and the outlet pipe 12 is to have a conventional form that is fused so as to be watertight.

At this time, as shown in Figure 3, the lower end of the manhole body 10 by forming a groove formed grooves along the outer surface 13, the water expansion index ring 70 in the fitting groove 13 after By connecting the, to improve the watertightness of the prefabricated composite manhole (1).

Next, the prefabricated inverter installation process (S2) is a process of installing the prefabricated inverter 50 which forms the channel 51 between the inflow pipe 11 and the outflow pipe 12 in the inside of the manhole body 10. As shown in FIG. 3 or 6 to 8, the prefabricated inverter 50 is in close contact with and inserted into the lower portion of the manhole body 10 and is connected to the outlet pipe 12 from the inlet pipe 11. 'L' type, 'T' type, '―' type, '+' type, '(' type, etc. to form a grooved channel 51 in a variety of forms, the inside is empty and the lower part of the filling portion ( 52 is formed, and the upper surface formed on both sides of the waterway 51 forms a pour hole 53 penetrated to the lower filling portion 52, thereby filling the filling portion 52 through the pour hole 53. And concrete can be poured into the lower part.

The prefabricated inverter 50 is placed in close contact with and inserted into the manhole body 10 so that the inflow pipe 11 and the outflow pipe 12 are connected to the water channel 51, and then inside the filling portion 52. By connecting and fixing the manhole body 10 and the prefabricated inverter 50 integrally with the connecting pins 55, the prefabricated inverter 50 is prevented from flowing and escaping when the concrete is poured later.

At this time, after the prefabricated inverter 50 is installed in the manhole body 10 as described above, and before the next step of the reinforcement step (S3), the fitting groove 13 formed in the lower outer surface of the manhole body 10 By further connecting the water expansion index ring 70 of the rubber material, it is possible to further improve the watertightness between the lower fixing plate 60 and the manhole body 10 to be formed later.

Next, the reinforcing bar reinforcement step (S3) is a step of reinforcing the reinforcement to the lower portion of the manhole body 10, as shown in Figure 3 a plurality of reinforcement to the lower portion of the manhole body 10 is connected to the prefabricated inverter 50 By forming the reinforcement part 61 which intersects at regular intervals, and later, when the concrete is poured into the lower part of the manhole body 10, the concrete is evenly poured and thus the rigidity of the lower fixing plate 60 formed thereby. Make it even better.

Next, the formwork installation step (S4) is a step of installing the formwork (not shown) to the lower portion of the manhole body 10, form the form of the lower fixing plate 60 to be formed to surround the lower manhole body 10. After the installation, the concrete is poured into the filling part 52 and the lower part and the formwork of the manhole body 10 by pouring concrete into the pouring hole 53 of the prefabricated inverter 50 through the concrete pouring and curing process (S5). When the mold is removed after curing, the lower fixing plate 60 is made of concrete, as shown in FIG. 1 or FIGS. 6 to 8.

By casting and curing concrete as described above to manufacture the lower fixing plate 60 integrally formed in the manhole body 10 and the prefabricated inverter 50, the connection and support strength to the weight body is strong and the manhole body 10 from the bottom To prevent flow, bending and breakage.

At this time, when the lower fixing plate 60 is manufactured through the above process, as shown in FIG. 3 or FIG. 7, each of the finishing plates 54 in which the fixing pin protrudes and is formed downward in the same shape as the pouring hole 53 is placed. Inserted and fixed in the ball 53 to close the pour ball 53, through which, the lower part of the manhole body 10 inside the prefabricated inverter 50 is closed, the manhole body by the prefabricated inverter 50 (10) to prevent foreign substances such as sewage or rainwater from entering the lower fixing plate 60, to prevent corrosion of the lower fixing plate 60 made of concrete.

In the manufacture of the lower fixing plate 60 through concrete pouring, a plurality of handles 62 are formed along the upper portion of the lower fixing plate 60 to handle the lower fixing plate 60 and the manhole body 10 connected thereto. To make it easier.

Next, the upper plate assembly step (S6), as shown in Figures 2 to 8, assembling the upper plate 20 to the upper portion of the manhole body 10 in which the prefabricated inverter 50 and the lower fixing plate 60 is integrally formed. As a step of forming, the upper plate 20 has a disk shape covering the upper part of the manhole body 10 at a predetermined thickness, and the entrance and exit 21 through which the manhole body 10 can enter and exit the central part thereof, In order to form a fixing groove 22 for fitting and fixing the upper end of the manhole body 10.

At this time, the top plate 20 is made of concrete, so as to absorb the vibration and impact of the surroundings so that the vibration and shock is not transmitted to the manhole body 10 to prevent the flow and departure of the manhole 10, the top plate ( In the manufacture of 20), the fixing bolt 23 for easily connecting the height adjusting portion 30 to the upper surface later protruding and forming a plurality of integrally along the outer surface of the doorway 21, the upper plate to the outside A plurality of handles 27 that facilitate movement, handling, and the like of 20 are integrally protruded and formed.

The upper plate 20 formed as shown in FIG. 3 or 6 to 8 has an upper end portion of the manhole body 10 in a state in which a rubber-like water expansion index ring 70 is provided in the fixing groove 22. It connects to the fixing groove 22 in an easy way, and the upper plate 20 made of concrete absorbs various vibrations and shocks transmitted from the upper part of the manhole 10 and at the same time the manhole body 10 ) Is fixed to the fixing groove 22 and provided with a water expansion index ring 70, to prevent the flow and separation of the manhole 10 and to improve the water-tightness, which can be variously changed and implemented through this manhole body ( 10) to prevent the flow and departure of the top plate (20).

And when the top plate 20 is assembled through the top plate assembly step (S8), by integrally forming a ladder ring 25 to hang the ladder 26 to the inner surface of the doorway 21 of the top plate 20, By placing the ladder 26 on the ladder ring 25 toward the manhole body 10, the operator can freely enter and exit the manhole body 10.

Next, the height adjustment unit assembly step (S7) is a step of assembling the height adjustment unit 30 for raising the support frame 40 by a certain height in order to match the height of the manhole cover 44 and the road surface, the height adjustment unit 3 is a fixing bolt 23 of the upper plate 20 in a cylindrical shape through which the inside is formed to have a predetermined height along the outer side of the entrance 21 of the upper plate 20, as shown in FIG. Through holes 31 for inserting the fixing bolts 23 are formed at positions corresponding to the fastening grooves, and the through holes 31 are formed in the fastening grooves having a predetermined width grooves in the upper outer side including the through holes 31. 32) is formed.

Through this, the height adjusting unit 30 provided as an upper portion of the upper plate 20, the fixing bolts 23 of the upper plate 20 to penetrate through the through hole 31 of the height adjusting unit 30, Assembling the top plate 20 and the height adjustment unit 30 by fastening and fixing the end of the fixing bolt 23 exposed through the fastening groove 32 with the fixing nut 24, the top plate 20 and the height At the same time to facilitate the connection of the adjustment unit 30, the fixing bolt 23 and the fixing nut 24 does not protrude to the upper portion of the height adjustment portion 30, the support frame provided in the upper portion of the height adjustment portion 30 ( Connect 40) closely.

And the height adjustment unit 30 by protruding and forming a plurality of fixing bolts 33 integrally along the upper surface in the same way as the top plate 20, after, using the fixing bolt 33 to support the base frame 40 Make it easy to connect.

At this time, the height adjustment unit 30 is manufactured in various modified embodiments as shown in Figure 4, the upper and lower surfaces are formed in parallel, as shown in the embodiment of (a), the road surface is parallel As shown in Fig. 6 or 7 by applying to the area, simply raise the height of the support frame 40 to match the manhole cover 44 with the road surface, or as shown in the embodiment of (b), By being formed to have a slope to one side, the road surface is applied to the inclined area, and as shown in FIG. 8, by adjusting the height and inclination of the support frame 40, the inclined road surface and the manhole cover 44 can be matched. Through this, by resurfacing the road surface, as well as the place where the height of the road surface is increased, the height adjustment unit 30 having a height and inclination corresponding to the inclined road surface is connected to the upper plate 20, the manhole cover ( 44) and the height and slope of the road surface It does not cause irregularities gotta identically formed to the road surface to improve the prevention of accidents and safety.

Finally, the support frame 30 is assembled through the support frame assembly process (S8) to the upper portion of the height adjustment unit 30 suitably connected according to the state of the road surface, as shown in FIG. Flange 41 is formed along the upper portion of the height adjustment portion 30, the support frame 40 formed with a seating portion 43 for seating the manhole cover 44 toward the flange 41, the height adjustment It is provided as an upper portion of the part 30, after connecting the fixing bolt 33 to the through-hole 42 of the flange 41 formed at the same interval as the fixing bolt 33 of the height adjustment unit 30 in a manner By fastening and fixing the fixing bolt 33 with the fixing nut 34, the supporting frame 40 is easily connected to the upper part of the height adjusting part 30, and the prefabricated composite manhole 1 according to the present invention through each of the above processes. ) Can be installed in the position where the manhole will be installed.

Prefabricated composite manhole (1) of the present invention manufactured through the above process, by easily forming and assembling each component, to improve the assembly, the manhole body 10 and the prefabricated inverter 50 is the lower fixing plate 60 It is formed integrally by the to close the connection of the prefabricated composite manhole (1) and at the same time to improve the support strength by the weight of the concrete, the prefabricated inverter (50) that the foreign matter flows into the lower fixing plate (60) This prevents the lower fixing plate 60 from corroding.

In addition, even when external forces such as various vibrations and shocks are transmitted from the upper part of the manhole body 10, the thick upper plate 20 made of concrete is absorbed, and the height and inclination of the manhole cover 44 and the road surface with the height adjusting part 30 is increased. By matching the, to prevent irregularities caused by the mismatch between the manhole cover 44 and the road surface and improve the safety.

Although the above has been illustrated and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment, anyone of ordinary skill in the art to which the present invention belongs, variously modified and implemented in various ways Of course, such changes are intended to fall within the scope of the claims set forth.

1 is a manufacturing process of the prefabricated composite manhole according to an embodiment of the present invention.

Figure 2 is a perspective view of a prefabricated composite manhole according to an embodiment of the present invention.

Figure 3 is an assembly view of the prefabricated composite manhole according to an embodiment of the present invention.

Figure 4 is a perspective view of the height adjustment unit according to an embodiment of the present invention.

5 is a plan view of a prefabricated composite manhole according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the line A-A 'of FIG. 5; FIG.

FIG. 7 is a partial cross-sectional view taken along line B-B 'of FIG. 5; FIG.

Figure 8 is a cross-sectional view of the prefabricated composite manhole according to another embodiment of the present invention.

[Description of Symbols for Main Parts of Drawing]

DESCRIPTION OF SYMBOLS 1 Prefabricated composite manhole 10: Manhole body 11: Inflow pipe 12: Outflow pipe

13: fitting groove 20: top 21: doorway 22: fixing groove

23, 33: fixing bolt 24, 34: fixing nut 25: ladder ring 26: ladder

27, 62: handle 30: height adjustment portion 31: through hole 32: fastening groove

40: support frame 41: flange 42: through hole 43: seating portion

44: manhole cover 50: prefabricated inverter 51: channel 52: filler

53: pour hole 54: finishing plate 55: fixing pin 60: lower fixing plate

61: back muscle part 70: water expansion index ring

Claims (12)

A manhole body manufacturing process (S1) of cutting the manhole body 10 to an appropriate height and penetrating the lower side to thereby fusion the inlet pipe 11 and the outlet pipe 12 to be watertight; Prefabricated type in which the manhole body 10 is in close contact with and inserted into the lower part of the manhole body 10, and the channel 51 is formed in the upper part, and the pour holes 53 in which the upper surfaces of both sides of the channel 51 penetrate downward. Prefabricated inverter installation process (S2) for connecting the inverter 50 into the manhole body 10; Reinforcing bar reinforcement step (S3) to form a reinforcement portion 61 is arranged while crossing the reinforcing bar at a lower portion of the manhole body (10); Formwork installation step (S4) for installing the formwork in the form of a lower fixing plate 60 to be formed under the manhole body 10; A concrete pouring and curing process of manufacturing the lower fixing plate 60 by removing the formwork after pouring and curing concrete into the lower part and the formwork of the manhole body 10 through the placing hole 53 of the prefabricated inverter 50 (S5); The upper plate 20 is formed of concrete, the entrance portion 21 penetrates to the center portion, and the upper plate 20 having the fixing groove 22 for fitting and fixing the upper end portion of the manhole body 10 to the bottom is formed of the manhole body 10. Top plate assembly step (S6) for assembling the upper end; A height adjusting unit assembly step (S7) of assembling the height adjusting unit 30 having a predetermined height along the outer surface of the entrance 21 of the upper plate 20; By manufacturing the prefabricated composite manhole 1 through each step of the support frame assembly process (S8) for assembling the support frame 30 for seating the manhole cover 44 to the upper portion of the height adjustment portion 30, The method of manufacturing a prefabricated composite manhole, characterized in that to improve the assembly of each component, to match the manhole cover 44 and the road surface, and to increase the support strength. The method of claim 1, The prefabricated inverter installation step (S2), By installing the prefabricated inverter 50 having the filling portion 52 having an empty inside and an open lower surface thereof, The method of manufacturing a prefabricated composite manhole, characterized in that the concrete is poured into the prefabricated inverter (50) to improve the strength of the lower fixing plate (60). The method of claim 2, The prefabricated inverter installation step (S2), By connecting and fixing the manhole body 10 and the prefabricated inverter 50 integrally with the connecting pins 55 in the filling portion 52, Method of manufacturing a prefabricated composite manhole, characterized in that the prefabricated inverter (50) prevents the flow and departure. The method of claim 1, The concrete pouring and curing process (S5), When the lower fixing plate 60 is manufactured, the finishing plate 54 having the fixing pin protruding and formed downward in the same shape as the pouring hole 53 of the prefabricated inverter 50 is inserted and fixed in each pouring hole 53 to finish. by doing, Method of manufacturing a prefabricated composite manhole to prevent foreign matter from entering the lower fixing plate 60 through the pour hole (53). The method of claim 1, The manhole body manufacturing step (S1), A groove is formed along the outer surface of the lower end of the manhole body 10 to form a fitting groove 13, and after the prefabricated inverter installation step S2, a water-expandable index ring 70 of rubber material is formed in the fitting groove 13. More connections; The upper plate assembly step (S6), By further providing a rubber expansion coefficient ring 70 between the manhole body 10 and the fixing groove 22 of the upper plate 20, The manufacturing method of the prefabricated composite manhole characterized by improving the watertightness. The method of claim 1, The upper plate assembly step (S6), Integrally forming a ladder ring 25 for hanging and fixing the ladder 26 to the inner side of the doorway 21 of the upper plate 20; By placing the ladder 26 on the ladder ring 25 toward the inside of the manhole body 10, Method of manufacturing a prefabricated composite manhole, characterized in that to facilitate the entry and exit into the manhole body (10). The method of claim 1, The concrete pouring and curing step (S5), and the top plate assembly step (S6), By protruding and forming at least one handle 62, 27 along the upper outer side of the lower fixing plate 60 and the upper plate 20, Method of manufacturing a prefabricated composite manhole, characterized in that the handling of the manhole body 10 more easily. The method of claim 1, The height adjustment unit assembly step (S7), At least one fixing bolt 23 protrudes and is formed along the outer surface of the doorway 21 to the upper surface of the upper plate 20; The height adjustment part 30 is a position corresponding to the fixing bolt 23 of the upper plate 20, the through hole 31 and the fastening groove grooved in the upper outer side including the through hole 31 ( 32) is formed; After connecting the support frame 30 to the height adjusting portion 30 in a manner to pass the protruding bolt 23 of the upper plate 20 to the through hole 31 of the height adjusting portion 30, the fastening groove 32 By assembling and fixing the fixing bolt 23 with the nut 24 in the inside, Method of manufacturing a prefabricated composite manhole, characterized in that the connection of the upper plate 30 and the height adjustment unit 30 easily and accurately. The method of claim 8, The support frame assembly step (S8), At least one fixing bolt 33 protrudes and is formed along an upper surface of the height adjusting part 30; The support frame 40, by forming a through-hole 42 at the same interval as the fixing bolt 33 of the height adjustment portion 30 in the flange (41); After connecting the support frame 40 to the height adjustment portion 30 in a manner to penetrate the protrusion bolt 33 of the height adjustment portion 30 to the through-hole 42 of the support frame 40, the fixing bolt 33 By assembling and fixing with a nut 34, Method of manufacturing a prefabricated composite manhole, characterized in that the connection of the height adjustment part 30 and the support frame 40 easily and accurately. The method of claim 1, The height adjustment unit assembly step (S7), By assembling the height adjustment unit 30 formed in parallel with the upper and lower surfaces, A method of manufacturing a prefabricated composite manhole, wherein the manhole cover 44 and the road surface coincide with each other by being applied and constructed in an area where the road surfaces are parallel to each other. The method of claim 1, The height adjustment unit assembly step (S7), By assembling the height adjustment unit 30 formed so that the upper surface has a slope to one side, A method of manufacturing a prefabricated composite manhole, wherein the manhole cover 44 and the road surface coincide with and are applied to an inclined area. By constructing the prefabricated composite manhole 1 manufactured by the method of any one of claims 1 to 11, Prefabricated composite manholes, characterized in that to improve the assembly of each component, the manhole cover 44 and the road surface, and to increase the strength of the support.

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