KR100639786B1 - Precast pulling up apparatus of manhole and mounting structure for precast pulling up apparatus of manhole and construction method for precast pulling up apparatus of manhole - Google Patents

Abstract

A precast pulling-up slab for a manhole, a mounting structure for the precast pulling-up slab, and a construction method of the precast pulling-up slab are provided to improve the firm combination performance by injecting the high speed hardening grout materials between the manhole body and the precast pulling-up slab. A precast pulling-up slab for a manhole is composed of a concrete unit(320); a ring unit(310) formed with a hanging protrusion(311) in which a manhole cover(400) is hung and formed with a flange(314) at the outer peripheral surface; an insertion hole formed with at the flange; an anchor(316) combined at the insertion hole; and plural penetration holes(321) formed along the circumferential direction at the concrete unit. The flange and anchor are laid at the concrete unit. High speed hardening grout materials(352,353) are placed in the penetration hole to cover a bolt(360).

Description

Precast pulling up apparatus of manhole and mounting structure for precast pulling up apparatus of manhole and construction method for precast pulling up apparatus of precast pulling slab for manhole and precast pulling slab for manhole manhole}

1 is a cross-sectional view of a conventional manhole.

Figure 2 is a cross-sectional view of the manhole is installed precast impression slab according to an embodiment of the present invention.

Figure 3 is an enlarged cross-sectional view of the manganese precast cast slab installation structure in accordance with a preferred embodiment of the present invention.

Figure 4 is a plan view of the precast impression slab for the manhole according to a preferred embodiment of the present invention.

Figure 5 is an enlarged cross-sectional view of the installation structure of the precast impression slab for the manhole according to a preferred embodiment of the present invention.

Figure 6 is a cross-sectional view of the manhole body according to another embodiment of the present invention.

** Description of symbols for the main parts of the drawing **

100 manhole body 110a upper casing

110b: lower casing 111: injection hole

112: coupling protrusion 113: coupling groove

120, 130: nut member 131: insert

132: coupling groove 200: branch pipe

210: branch installation 300: precast impression slab

310: ring portion 311: locking jaw

312: first groove 313: second groove

314: flange 315, 370: nut

316: anchor 317: thread

318: entrance hole 320: concrete part

321: through hole 322: seating groove

323: first additional groove 324: shear groove

325: second additional groove

340: blocking material 330: sealing member

351: cemented carbide grout layer 352, 353: cemented carbide grout material

360: Bolt

370: nut 380: washer

400: manhole cover 500: asphalt emulsion layer

600: rebar

Korea Registration Room No. 20-378412

The present invention relates to a precast impression slab for manhole, in particular, an insertion hole is formed in the flange and the anchor is coupled to the insertion hole, the flange and the anchor is embedded in the concrete portion, the concrete portion in the circumferential direction A plurality of through-holes are formed along the pre-casting slab, and the construction time is shortened by installing a pre-made precast impression slab in the manhole body, and a superscopy grout material is injected between the manhole body and the precast impression slab through the through hole. The precast impression slab and manhole body relate to a rigidly coupled precast impression slab for manholes.

Manholes provided with conventional impression members are those presented in Korean Registration Room No. 20-378412.

As shown in Figure 1, the manhole buried underground is a prefabricated manhole is at least one lower casing 12-3 pre-formed with concrete and the like, and mounted on the lower casing 12-3 concentrically and fixed An intermediate casing 12-2 and upper casings 12-1 concentrically mounted on and fixed to an upper surface of the intermediate casing 12-2, and having upper and lower entrances formed thereon, and the upper casings 12-1. The intermediate casing 12-2 and the lower casing 12-3 are stacked and fixed concentrically.

The intermediate casing 12-2 is to adjust the height of the manhole, and the height of the manhole can be adjusted by increasing or decreasing the assembly number as necessary.

The upper casing 12-1 has a coupling protrusion formed on the side wall bottom and protrudes in the circumferential direction, and a nut member made of a metal material is inserted into the bottom surface of the side wall on which the coupling protrusion is formed. When the 12-1) is molded in the mold, the upper casing 12-1 is molded by putting the mold in the mold in advance, and thus, the upper casing 12-1 is assembled to the upper casing 12-1. The upper surface is formed with an entrance and the manhole cover 11 is coupled.

The circumference of the entrance to which the manhole cover 11 is assembled is an annular flange portion 25 is embedded and fixed as a high information bolt. And the fixing member 14 is assembled to the nut member is screw-assembled is installed so that the portion is not formed in the protrusion protrudes downward from the bottom of the upper casing (12-1) by a predetermined length.

On the other hand, the intermediate casing (12-2) is formed in the upper surface has an annular coupling groove for engaging with the engaging projection of the upper casing (12-1), the coupling groove protrudes from the bottom surface of the upper casing (12-1). The coupling hole for inserting the fixed rod 14 is formed to a certain depth, the nut member is embedded in the bottom surface, the same as the upper casing 12-1, the fixing rod 19 is screwed to the nut member Combination is combined to protrude to a certain length downward.

In addition, the lower casing 12-3 has a branch pipe connection hole 31 formed on a side wall thereof to which the branch pipe 30 is connected, and an upper casing on the side wall of the lower casing 12-3 is formed in the same manner as the upper casing 12-2. A coupling groove for accommodating the coupling protrusion provided on the bottom of 12-2) and a plurality of coupling holes for inserting and fixing the fixing rod 19 are formed to have a constant depth.

Referring to the process of assembling the prefabricated manhole configured as described above, the lower casing (12-3) is placed on the ground and the binder is applied or filled in the coupling groove provided on the upper sidewall of the lower casing (12-3) When the intermediate casing 12-2 is laminated so that the engaging projection provided on the bottom surface of the side wall of the intermediate casing 12-2 is inserted into the engaging groove of the lower casing 12-3, the intermediate casing 12-2 is the lower casing. (12-3) is positioned exactly in the concentric position and at the same time, the fixing rods 19 protruding from the bottom of the side wall of the intermediate casing (12-2) formed on the upper surface of the lower casing (12-3) The intermediate casing 12-2 and the lower casing 12-3, which are stacked on each other by being inserted into the coupling holes and fixed by the bonding material, are firmly fixed to each other.

Subsequently, after applying or filling the bonding material in the coupling groove provided on the upper sidewall of the intermediate casing 12-2, the upper casing 12-1 is placed thereon, and the coupling protrusion provided on the bottom surface of the upper casing 12-1. The upper casing 12-1 is exactly concentrically arranged with respect to the intermediate casing 12-2 and the lower casing 12-3 below the upper casing 12-1. At the same time, the bottom surface of the upper casing 12-1 and the upper surface of the intermediate casing 12-2 are bonded to each other as a bonding material, and the fixing rod 14 is also firmly fixed by the bonding material in the coupling hole.

In the conventional manhole, the impression member is used to adjust the height of the manhole cover is installed.

The conventional impression member is provided with an annular flange portion around the entrance to which the manhole cover is assembled and fixed through a fixing bolt, and mortar is injected between the annular flange portion and the upper casing 12-1.

However, since the impression member has to inject mortar at the height to be raised, it takes a lot of construction time, and even after the construction, the vehicle is forced to pass through the ground where the hall is installed due to early traffic opening before the mortar is completely dried. There is a problem that it is broken and difficult to maintain the height of the manhole cover is initially installed.

 The present invention has been made to solve the above-described problem, the insertion hole is formed in the flange and the anchor is coupled to the insertion hole, the flange and the anchor is embedded in the concrete portion, the concrete portion along the circumferential direction A plurality of through holes are formed, and the precast impression slab made in advance is installed in the manhole body to shorten the construction time, and the superhard grout material is injected between the manhole body and the precast impression slab through the through hole. The impression slab and the manhole body are to provide a manhole precast impression slab and manhole precast impression slab installation structure that is firmly coupled to the manhole precast cast slab construction method.

The manhole precast impression slab of the present invention for achieving the above object is formed with a concrete part, and a locking jaw is formed on the inner wall of the manhole cover, the ring portion is formed on the outer peripheral surface,

Insertion holes are formed in the flange, the anchor is coupled to the insertion hole,

The flange and the anchor are embedded in the concrete portion,

The concrete portion is characterized in that a plurality of through-holes are formed along the circumferential direction.

According to this configuration, the construction time is shortened by installing a precast impression slab made in advance in the manhole body, and the super-speed grout material is injected between the manhole body and the precast impression slab through the through hole to precast impression slab. And manhole body has the advantage of being firmly coupled.

Precast impression slab installation structure for the manhole according to a preferred embodiment of the present invention, the manhole body is installed on the upper surface and the nut member, the manhole body is disposed on the upper portion, the concrete part, the locking jaw is caught on the inner wall of the manhole cover Is formed and formed on the outer circumferential surface and comprises a precast impression slab including a ring portion is formed in the circumferential direction on the outer circumferential surface so as to come on the upper flange,

An insertion hole is formed in the flange, an anchor is coupled to the insertion hole, a nut is fitted into the anchor, and a bent portion is formed below the anchor,

The flange and the anchor are embedded in the concrete portion,

The concrete portion is formed with a plurality of through holes along the circumferential direction,

The through hole is coupled to the bolt having a smaller cross-sectional area than the through hole,

A nut is inserted into the bolt, and a washer is installed between the nut and the concrete part, and a hole is formed in the washer or the washer is installed so that the washer does not completely cover the through hole. Injection space is formed,

A lower portion of the bolt is coupled to the nut member,

A seating groove in which the washer is seated is formed on an upper surface of the concrete part.

Between the concrete portion and the manhole body, a superscopy grout layer is disposed,

There is provided a sealing member for blocking between the concrete portion and the manhole body,

A superscopy grout material is disposed in the through hole so as to surround the bolt.

Reinforcement is embedded in the concrete portion along the outer circumferential surface to be disposed outside the through hole.

An insertion hole is formed in the flange, an anchor is coupled to the insertion hole, a nut is fitted in the anchor, a bent portion is formed below the anchor, the flange and the anchor are embedded in the concrete portion, the concrete portion and the ring The addition can be firmly combined.

A plurality of through holes are formed in the concrete portion along the circumferential direction, and bolts having a smaller cross-sectional area than the through holes are coupled to the through holes, nuts are fitted into the bolts, and washers are installed between the nuts and the concrete parts. However, a hole is formed in the washer or the washer is installed so as not to completely cover the through hole, so that an injection space through which the superscopy grout material can be injected into the through hole is formed, and the lower portion of the bolt is coupled to the nut member. A superhard grout layer is disposed between the concrete portion and the manhole body, and a superhard grout material is disposed to surround the bolt inside the through hole, and the precast impression slab may be firmly coupled to the manhole body.

Reinforcement is embedded in the concrete portion along the outer circumferential surface so as to be disposed outside the through hole, thereby increasing durability of the precast slab.

The mounting groove in which the washer is seated is formed on the upper surface of the concrete part, so that it is easy to assemble the washer at the time of construction, and the upper surface of the concrete part can be maintained in a plane, thereby making it easy to install.

According to a preferred embodiment of the present invention, a method for constructing a precast impression slab for a manhole includes coupling a bolt having a cross-sectional area smaller than a through hole formed in a concrete part of the precast impression slab to a nut member installed in the manhole body, and washer on the bolt. And arranging a nut, inserting the bolt into the through hole, and installing a precast cast slab to be spaced apart from the manhole body, and disposing a blocking material inside and outside between the manhole body and the precast cast slab. And, characterized in that it comprises a step of pouring the super hard bore grout material into the hole formed in the washer or the washer and the through-hole.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

For reference, among the configurations of the present invention to be described below, the same configuration as the prior art will be referred to the above-described prior art, and a detailed description thereof will be omitted.

Figure 2 is a cross-sectional view of the manhole prefabricated impression slab is installed according to a preferred embodiment of the present invention, Figure 3 is an enlarged cross-sectional view of the structure for installing the manhole precast impression slab according to a preferred embodiment of the present invention, Figure 4 is a present invention A plan view of a manhole precast impression slab according to a preferred embodiment of the present invention, Figure 5 is an enlarged cross-sectional view of the manhole precast impression slab installation structure according to a preferred embodiment of the present invention.

As shown in Figure 2 to 5, the manhole precast impression slab installation structure of the present embodiment, the manhole body 100 is installed on the upper surface and the nut member 130, and disposed on the manhole body 100 The concrete part 320 and a locking jaw 311 is formed on the inner wall of the manhole cover 400, and a flange 314 is formed on an outer circumferential surface thereof, and a groove is formed along the circumferential direction on the outer circumferential surface of the flange 314. It comprises a precast impression slab 300 including a ring portion 310 is formed.

The manhole body 100 includes a lower casing 110b and an upper casing 110a disposed on the lower casing 110b, and a nut member 130 is installed on an upper surface of the upper casing 110a.

A coupling groove 113 is formed at an upper end of the lower casing 110b, and a coupling protrusion 112 fitted to the coupling groove 113 is formed at a lower end of the upper casing 110a to form the lower casing 110b and the upper casing 110a. Will be combined.

In addition, the fixing rod installed in the lower casing 110b is coupled to the nut member 120 so that the lower casing 110b and the upper casing 110a are more firmly coupled.

The lower pipe casing 110b has a branch pipe installation hole 210 to which the branch pipe 200 is fitted.

Branch pipe installation hole 210 is tapered so that the cross-sectional area is larger toward the outside of the lower casing (110b).

After the branch pipe 200 is inserted into the branch pipe installation hole 210, the waterproof cap 111 connects the branch pipe with the lower casing.

The injection cap 111 is formed at one side of the waterproof cap so that the mortar is filled between the inner wall of the branch pipe installation hole 210 and the branch pipe 200.

The nut member 130 has an insert 131 which has a larger outer diameter than the body and is formed step by step, and the insert 131 is formed with a groove 132 to which the bolt 360 is coupled, and the groove 132. Threads are formed on the inner circumferential surface.

The nut member 130 is provided in plurality along the circumferential direction.

The precast impression slab 300 is disposed above the manhole body 100, and a concrete part 320 and a locking jaw 311 is formed on the inner wall of the manhole cover 400, and a flange 314 is formed on an outer circumferential surface thereof. It is formed and includes a ring portion 310 is formed in the circumferential direction on the outer circumferential surface to be located above the flange 314.

The entrance hole 318 is formed in the center of the ring portion 310, and may be formed of a material having high rigidity.

The groove is formed along the outer circumferential surface of the ring part 310, and includes a first groove 312 and a second groove 313, and the second groove 313 is formed to be stepped below the first groove 312. It is.

That is, the depth of the second groove 313 is formed deeper than the depth of the first groove 312.

The flange 314 is formed with a plurality of insertion holes in the circumferential direction, the anchor 316 is fitted to the insertion hole is coupled.

The anchor 316 is bent perpendicularly to the lower end is formed with a bent portion.

A thread 317 is formed in the vertical portion of the anchor 316, and nuts 315 are fitted in the upper and lower portions of the anchor 316, respectively.

The flange 314 and the anchor 316 are made in advance before the manhole construction to be embedded in the concrete portion (320).

The ends of the flange 314 and the anchor 316 are buried close to the through hole 321.

The concrete part 320 is formed with a plurality of through holes 321 along the circumferential direction.

The concrete part 320 is formed in a circular cross section, and may be variously applied, such as a square, a pentagon, and a hexagon.

In addition, the upper surface of the concrete portion 320 is formed so that the mounting groove 322, the washer 380 is seated in communication with the through-hole 321.

On the other hand, the concrete portion 320 is embedded along the outer circumferential surface so that the reinforcement 600 is disposed outside the through hole 321, to increase the durability of the concrete portion 320 that may be weakened by the through hole 321. Can be.

As shown in FIG. 6, the first additional groove 323, the shear groove 324, and the second additional groove 325 may be formed on the bottom surface of the concrete part 320 in a ring shape along the circumferential direction from the outside. Can be.

The first additional grooves 323, the front end grooves 324, and the second additional grooves 325 are formed to become smaller and smaller as the width thereof is directed upward, so that the cross-sectional shape is formed in a trapezoidal shape.

In addition, the height of the front end groove 324 is formed higher than the first additional groove 323 and the second additional groove (325).

The first additional groove 323 is formed to come outside the through hole 321 to correspond to where the sealing member 330 is disposed.

The shear groove 324 and the second additional groove 325 are formed between the through hole 321 and the entrance hole 318.

As described above, the shear groove 324 is formed to fill the shear groove 324 with the super-speed grout material, thereby preventing the precast impression slab 300 from moving by the shear force.

In addition, the first additional groove 323 and the second additional groove 325 is formed, the installation position of the member for preventing the sealing member 330 or the super hard bore grout material flows is determined to seal the sealing member 330 and the like. There is an advantage that it becomes easy to install.

The bolt 360 is formed to have a smaller cross-sectional area than the through hole 321 and is fitted into the through hole 321.

Nuts 370 are fitted to upper and lower bolts 360, respectively.

The washer 380 has a length longer than the width and a fastening hole into which the bolt 360 is fitted is formed at the center.

In addition, the width of the washer 380 is formed smaller than the diameter of the through hole 321.

As shown in FIG. 4, the washer 380 is installed so as not to completely cover the through hole 321 between each nut 370 and the concrete part 320.

Therefore, an injection space for injecting the superscopy grout materials 352 and 353 into the through hole 321 is formed.

Unlike the foregoing, the holes may be formed in the washer 380 so as to communicate with the through hole 321 so that the superscopy grout members 352 and 353 may be injected.

The supersonic carbide grout material layer 351 is disposed between the concrete part 320 and the upper casing 110a of the manhole body 100 due to the injected supersonic carbide grout material.

In addition, due to the injected superhard grout material, the super fast grout member 352 is disposed to surround the bolt 360 in the through hole 321, and the super fast grout material 353 is also disposed in the seating groove 322. Will be filled.

That is, the bolt 360, the nut 370, and the washer 380 are embedded in the superhard grout members 352 and 353.

The superhard grout materials 352 and 353 and the superhard grout material layer 351 join two different members.

Such cemented carbide grout material is that disclosed in Korea Patent Publication No. 1998-69091.

The sealing member 330 is disposed between the concrete part 320 and the manhole body 100 to seal between the concrete part 320 and the upper casing 110a of the manhole body 100.

The sealing member 330 is formed in a ring shape and is installed to approach the outer circumferential surface of the concrete part 320.

The manhole body 100 does not spill between the manhole body 100 and the precast impression slab 300 when injecting the cemented carbide gratuit agent 352 and 353 during construction. ) And the blocking material 340 may be disposed between the precast impression slab 300 and the inner peripheral surface of the concrete part 320.

The operation of this embodiment having the above-described configuration will be described below.

According to a preferred embodiment of the present invention, a method for constructing a manned precast slab 300 includes a manhole body having a bolt having a smaller cross-sectional area than a through hole 321 formed in the concrete part 320 of the precast manned slab 300. It is coupled to the nut member 130 installed in the (100), the washer 380 and the nut 370 is disposed in the bolt 360, the bolt hole 360 is inserted into the through hole 321 to the manhole Installing the precast impression slab 300 spaced apart from the body 100, and placing a blocking material on the inside and the outside between the manhole body 100 and the precast impression slab 300, the washer ( And pouring the cemented carbide grout members 352 and 353 into a hole formed in the 380 or a space between the washer 380 and the through hole 321.

A bolt having a cross-sectional area smaller than the through hole 321 formed in the concrete part 320 of the precast impression slab 300 is screwed to the nut member 130 installed in the manhole body 100.

The nut 370 is screwed so that the screwed bolt 360 is at a height high enough to raise the precast impression slab 300, and the washer 380 is inserted into the bolt 360 so that the nut 370 is positioned over the nut 360. Put it in.

Outside the manhole body 100 is disposed a sealing member 330 to act as a blocking material.

The sealing member 330 is inserted into and disposed in the first additional groove 323 formed on the bottom surface of the concrete part 320.

The precast impression slab 300 is disposed on the washer 380 that is fitted by inserting the bolt 360 into the through hole 321.

As such, the precast impression slab 300 is spaced apart from the manhole body 100.

The blocking material 340 is disposed inside the upper part of the manhole body 100.

That is, the blocking material 340 on the inner side is disposed to surround the access hole 318, and the sealing member 330 on the outer side is disposed to surround the blocking material 340.

Unlike the above, after inserting the bolt 360 having a cross-sectional area smaller than the through hole 321 into the through hole 321 formed in the concrete portion 320 of the precast impression slab 300 made in advance, The washer 380 is inserted into the bolt 360 to be disposed below or above the concrete part 320, and then the bolt 360 is coupled to the nut member 130 installed in the manhole body 100. By tightening the nut 370 to close the washer 380 to the bottom of the seating groove 322 and the lower surface of the concrete portion 320 may be installed to space the precast impression slab 300 in the manhole body 100.

In this manner, the precast impression slab 300 may be spaced apart from the manhole body 100 in various ways.

The superhard grout material is poured into the through hole 321 to the hole formed in the washer 380 disposed below the bolt 360 or the injection space between the washer 380 and the through hole 321. Inject.

The supersonic carbide grout material is injected so that the supersonic carbide grout material layer 351 is formed between the lower part of the concrete part 320 and the upper part of the manhole body 100 and the shear groove 324, and the lower part of the concrete part 320 and the manhole body ( 100) When the superhard grout material layer 351 is formed between the upper part, the superhard grout material 352 is filled in the through hole 321.

Subsequently, the washer 380 and the nut 370 are fastened to the bolt 360 penetrating the through hole 321 to fix the precast impression slab 300.

Unlike the above, the washer 380 and the nut 370 may be fastened only to the lower portion of the bolt 360.

Subsequently, the fastening groove grout material 353 is also filled in the seating groove 322.

Here, when the cemented carbide grout material layer 351 is hardened to some extent, the blocking material 340 disposed inside may be removed.

This makes it possible to raise the height of the manhole according to the depth of the installation place.

According to this configuration, the construction time is shortened by installing the precast impression slab 300 made in advance in the manhole body 100, the super hard bore grout material through the through hole 321 is the manhole body 100 and the It is injected between the precast impression slab 300 and the precast impression slab 300 and the manhole body 100 has an advantage that is firmly coupled.

In addition, the height adjustment portion is adjusted by the pre-made concrete portion 320, and after making a fine adjustment, the superfine diameter grout of the cemented carbide grout material layer 351 disposed between the lower portion of the concrete portion 320 and the upper part of the manhole body 100 The ash is highly fluid and quickly hardens, preventing early height adjustment from breaking even with early traffic opening.

It is easy to install and the air is shortened, so traffic congestion and height adjustment parts can be broken and risk factors that can cause an accident can be solved early.

In addition, the workability is improved and the watertightness is increased, thereby ensuring the construction quality.

The method of repairing the pre-installed manhole cover 400 to raise it using the precast impression slab 300 of the present invention is as follows.

After cutting the installed asphalt and concrete, break the asphalt.

Subsequently, the remaining soil of broken asphalt is treated and cleaned around the manhole.

A circular cut is made to the road part where the precast impression slab 300 is to be installed as much as the dotted line shown in FIG. 3.

Insert a nut member 130, such as a set anchor (set anchor) in the pre-installed manhole body.

Thereafter, the precast impression slab 300 is installed on the pre-installed manhole body by the construction method of the manhole precast impression slab 300 as described above.

When the installation is completed, the asphalt emulsion is applied so that the asphalt emulsion layer 500 is formed on the upper surface of the concrete part 320.

Mince finishes and asphalt pavement.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications or variations of the present invention without departing from the spirit and scope of the invention described in the claims below Can be carried out.

According to the manhole precast impression slab and manhole precast impression slab installation structure and manhole precast impression slab construction method of the present invention as described above, has the following effects.

An insertion hole is formed in the flange, and an anchor is coupled to the insertion hole. The flange and the anchor are embedded in the concrete part, and the concrete part has a plurality of through holes formed along the circumferential direction. The installation time is shortened by installing in the manhole body, and the super-speed grout material is injected between the manhole body and the precast impression slab through the through hole, and the precast impression slab and the manhole body are firmly coupled.

In addition, the workability is improved, and the superhard grout material is filled between the precast impression slab and the manhole body, thereby increasing the watertightness, thereby ensuring construction quality.

Early opening of traffic can prevent the height adjustments from breaking.

It is easy to install and the air is shortened, so traffic congestion and height adjustment parts can be broken and risk factors that can cause an accident can be solved early.

The height adjustment is facilitated using the bolt by screwing the nut so that the bolt is at a height as high as the height at which the precast pulling slab is to be raised.

In addition, durability is improved by combining the precast impression slab and the manhole body with bolts and superhard grout.

There is an advantage in that the manhole cover is formed on the precast impression slab, so that the manhole cover can be installed immediately.

By using a carbide tip grout material, the strength can be made uniform.

An insertion hole is formed in the flange, an anchor is coupled to the insertion hole, a nut is fitted in the anchor, a bent portion is formed below the anchor, the flange and the anchor are embedded in the concrete portion, the concrete portion and the ring The addition can be firmly combined.

A plurality of through holes are formed in the concrete portion along the circumferential direction, and bolts having a smaller cross-sectional area than the through holes are coupled to the through holes, nuts are fitted into the bolts, and washers are installed between the nuts and the concrete parts. However, a hole is formed in the washer or the washer is installed so as not to completely cover the through hole, so that an injection space through which the superscopy grout material can be injected into the through hole is formed, and the lower portion of the bolt is coupled to the nut member. A cemented carbide grout material layer is disposed between the concrete portion and the manhole body, and a cemented carbide grout material is disposed to surround the bolt inside the through hole, and the precast impression slab may be firmly coupled to the manhole body.

Reinforcement is embedded in the concrete portion along the outer circumferential surface so as to be disposed outside the through hole, thereby increasing durability of the precast slab.

The mounting groove in which the washer is seated is formed on the upper surface of the concrete part, so that it is easy to assemble the washer at the time of construction, and the upper surface of the concrete part can be maintained in a plane, thereby making it easy to install.

Claims (3)

Concrete section; A locking jaw is formed on the inner wall of the manhole cover is formed, and comprises a ring portion formed with a flange on the outer peripheral surface; Insertion holes are formed in the flange, the anchor is coupled to the insertion hole, The flange and the anchor are embedded in the concrete portion, The precast impression slab for the manhole, characterized in that the concrete portion is formed with a plurality of through holes along the circumferential direction. A manhole body having a nut member installed on an upper surface thereof; The precast is disposed on the manhole body, and includes a concrete part, a locking jaw is formed on the inner wall of the manhole cover is formed, and a flange is formed on the outer circumferential surface and a groove is formed on the outer circumferential surface along the circumferential direction so as to come on the flange. Including impression slab, An insertion hole is formed in the flange, an anchor is coupled to the insertion hole, a nut is fitted into the anchor, and a bent portion is formed below the anchor, The flange and the anchor are embedded in the concrete portion, The concrete portion is formed with a plurality of through holes along the circumferential direction, The through hole is coupled to the bolt having a smaller cross-sectional area than the through hole, A nut is inserted into the bolt, and a washer is installed between the nut and the concrete part, and a hole is formed in the washer or the washer is installed so that the washer does not completely cover the through hole. Injection space is formed, A lower portion of the bolt is coupled to the nut member, A seating groove in which the washer is seated is formed on an upper surface of the concrete part. Between the concrete portion and the manhole body, a superscopy grout layer is disposed, There is provided a sealing member for blocking between the concrete portion and the manhole body, A superscopy grout material is disposed in the through hole so as to surround the bolt. Precast impression slab installation structure for the manhole, characterized in that the reinforcing bar is embedded along the outer circumferential surface so that the reinforcing bar is disposed outside the through hole. The bolt having a cross-sectional area smaller than the through hole formed in the concrete part of the precast impression slab is coupled to the nut member installed in the manhole body, the washer and the nut are disposed in the bolt, and the bolt is inserted into the through hole to the manhole body. Disposing a precast impression slab in a spaced apart position, and placing a blocking material on an inner side and an outer side between the manhole body and the precast impression slab; And a super speed grout material pouring step into the hole formed in the washer or the space between the washer and the through hole.

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