KR20170066928A - Concrete Covering Structure Using Mould and Constructing Method of the Same - Google Patents

Concrete Covering Structure Using Mould and Constructing Method of the Same Download PDF

Info

Publication number
KR20170066928A
KR20170066928A KR1020150173168A KR20150173168A KR20170066928A KR 20170066928 A KR20170066928 A KR 20170066928A KR 1020150173168 A KR1020150173168 A KR 1020150173168A KR 20150173168 A KR20150173168 A KR 20150173168A KR 20170066928 A KR20170066928 A KR 20170066928A
Authority
KR
South Korea
Prior art keywords
mold
concrete
type
lid
lid body
Prior art date
Application number
KR1020150173168A
Other languages
Korean (ko)
Other versions
KR101776061B1 (en
Inventor
신근호
강규석
신동파
Original Assignee
주식회사 나노텍리소스
강규석
신동파
신근호
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 나노텍리소스, 강규석, 신동파, 신근호 filed Critical 주식회사 나노텍리소스
Priority to KR1020150173168A priority Critical patent/KR101776061B1/en
Publication of KR20170066928A publication Critical patent/KR20170066928A/en
Application granted granted Critical
Publication of KR101776061B1 publication Critical patent/KR101776061B1/en

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/04Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00Moulds; Cores; Mandrels
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F3/00Sewer pipe-line systems
    • E03F3/06Methods of, or installations for, laying sewer pipes
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G9/00Forming or shuttering elements for general use
    • E04G9/10Forming or shuttering elements for general use with additional peculiarities such as surface shaping, insulating or heating, permeability to water or air

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Public Health (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Sewage (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

The present invention discloses a concrete lid and a method of constructing the same. The present invention relates to a concrete lid and a method of constructing the lid, The concrete lid can be maintained in the correct position on the upper part of the drainage channel or the common channel, and the concrete lid can be maintained in a molded form from the concrete lid, When the formwork is not removed, it is possible to maintain the same strength with a smaller standard than the conventional concrete lid. Also, it is possible to accurately position the reinforcing bars on the concrete lid, The concrete lid is stably fixed to the open upper part of the common pipe, and the mold-type mold having the film structure with a certain thickness is mass-produced in the required shape, and the concrete lid is moved to the required place, , It is possible to mass-produce standardized and robust high-quality products regardless of the place, as well as to provide a buffering force when the produced product is surrounded by a film of a die and faces a neighboring product, .

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a method of constructing a concrete cover using a mold-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a concrete lid to be laid on an open upper part of a drainage channel or a common pipe line, and more particularly to a concrete lid The present invention relates to an on-site concrete cover using a mold-type mold for facilitating the production of a concrete cover, more preferably to pour the concrete continuously with the upper open mold- Thereby enabling the continuous production of the concrete cover.

The present invention is also directed to a method of forming a mold in which a plurality of ribs are formed on an inner wall surface in accordance with the shape of a lid to be molded to stably maintain a box-like structure upon pouring concrete into a mold, It can be used as a shock-absorbing pad, and if necessary, a reinforcement iron groove can be repeatedly formed on the inside of the rib so as to stably place the reinforcing material inserted in the concrete lid. ≪ / RTI >

Generally, an upper open drainage or communal line is provided at the road edge and the outside of the lower part of the median separator to guide rainwater or the like flowing on the road surface, such as a road, into the sewer or the underground, and various types of fullerium, Concrete trenches are used for trenches, troughs, manholes, etc. When producing these concrete covers, concrete is poured into the mold at the site to cure the concrete, concrete is put into the mold, If you need a positive product, you need to select the floor flat and then form (form the plywood using flat plywood etc.) and install the horizontal wall and vertical wall at necessary intervals in the horizontal and vertical directions. There are various production methods such as a method.

A typical formwork manufactured in the field is prepared by first attaching a plywood to a floor to install a flat plate and successively installing a horizontal wall in a predetermined width (about 500 mm interval) therebetween, About 300 to 400 mm intervals) to complete the form of the desired shape. Then, pour concrete that has been transported by the concrete truck into it and flatten it, and then curing and releasing it, you can get the desired concrete cover.

At this time, when a groove for forming a handle is to be formed in the width direction of the concrete lid, a mold of a handle groove is attached to the inner side wall of the vertical wall or the vertical wall.

However, in the conventional field production method, there is a limit to produce many concrete lids, cracks and cracks occur in the concrete lids, and it is difficult to produce precise products and it is difficult to carry by weight. It is difficult to produce a standardized collapse, cracks or cracks occur in the product after the mold is demoulded, and it is difficult to carry the product by its weight.

That is, the above-mentioned field production method has an advantage that a large number of products can be produced at the same time by using a large vacant space adjacent to a site or a site, and in this case, the shape of the assembled form is not constant, There is an inconvenience in the operation of demolding work to dismantle all of the dies after obtaining the cured product by pouring the concrete into concrete, and there is an uneconomical problem that the expensive dies can not be reused, It is necessary to repeat the process of reassembling the large formwork in order to obtain the workability.

On the other hand, the concrete lid produced by the machine has a merit that it can be mass-produced since the mold is made of metal plate, then the mixed mortar is put into the mold, the block body is completed by pressing with a certain pressure, However, since the concrete density is not compact, the impact strength is greatly deteriorated, which is easily damaged due to the surrounding vibration transmitted during the transportation as well as the use environment after the construction.

That is, the mechanical production method has a disadvantage in that it is difficult to mass-produce due to limited working space and curing period, while it is advantageous to standardize a product by repeatedly manufacturing a certain mold.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a mold structure, which is a box- The concrete lid can be maintained in an accurate size at the upper part of the drainage channel or the common channel by configuring the continuous construction of the concrete lid by pouring the concrete continuously in the state where the lid is laid, and when the mold lid is not removed from the concrete lid, It is possible to maintain the same strength with a smaller size than the cover and to maintain the same strength even when the amount of reinforcing bars is reduced even when the reinforcing bars are correctly placed on the concrete lid, Provide concrete cover and its construction method to reliably fixed haryeoneunde aims.

A concrete lid of the present invention for achieving the above object is a box-like structure having an open upper part, which is molded into a film having a certain thickness constituting a wall and a bottom surface, and stably retains a box-like structure when concrete is poured therein. And a lid body which is molded at the time of curing by placing the concrete in the mold type die; And the concrete is laid on the inner surface of the mold-type die to stably maintain the box-like structure when the lid body is molded, while the film having a certain thickness constituting the wall and the bottom surface acts as a shock absorbing pad. A plurality of ribs connecting the film are continuously formed, and the mold-type die is separated from the cover body or integrally formed with the cover body.

In addition, bent portions are protruded from the left and right side walls of the mold forming the mold, and open handle grooves formed by the bent portions are formed on the side of the cover body.

An upper ring is formed on the upper surface of the lid body.

A tubular body is formed on the rib, and a drain hole formed by the tubular body is formed on the lid body.

In addition, a reinforcing iron core is formed in the inside of the cover body, and an iron core holding groove for stably aligning the reinforcing iron core is repeatedly formed inside the rib.

In addition, the ribs are formed at a height of 1/2 of the total height of the mold-shaped dies.

In addition, the mold-type die is provided with a cut-away portion enabling separation from the lid body.

In addition, when the mold-type mold is separated from the lid body, the mold-type mold is partially separated or entirely separated through the cut-away.

In addition, the mold-type die forms a step portion at the upper and lower boundaries so as to be able to be mounted on the drainage path or the upper portion of the common pipe.

According to another aspect of the present invention, there is provided a method of constructing the concrete lid, comprising: forming a box-shaped structure having an open upper portion and forming a wall having a predetermined thickness to form a wall and a lower floor, A first step of arranging the dies in a multi-stage arrangement in an open upper part of a drainage channel or a common channel; A second step of continuously casting and curing the concrete by using a remicon truck on the mold-type die arranged in multi-stages, thereby molding the cover body; And a third step of keeping the mold type die from the lid body molded from the second step or separating part or all of the mold type die from the lid body; Type mold, the ribs continuously formed on the inner surface of the mold-type mold may act as a shock-absorbing pad while stably maintaining the box-shaped structure of the mold-type mold when the concrete is poured will be.

Further, in the first step, the mold-type die is placed on an open upper portion of a drainage channel or a common channel through a step formed at upper and lower boundaries; As shown in FIG.

Further, in the first step, a step of arranging a reinforcing iron core in an iron core holding groove repeatedly formed on the rib of the mold-shaped die; As shown in FIG.

In addition, in the second step, when the concrete is poured, a step of forming a handle groove opened on the side of the lid body through the bent portions formed on the left and right side walls of the mold forming the mold, As shown in FIG.

Further, in the second step, a step of forming an upper ring on the upper surface of the lid body; As shown in FIG.

In addition, in the second step, a step of forming a drainage hole in the lid body through a pipe formed on the rib of the mold-type die when the concrete is poured; As shown in FIG.

In the third step, a step of separating the upper end, the lower end, the upper end, or the lower end of the mold-type die based on the reduction of the mold-type die when the mold-type die is separated from the lid body; As shown in FIG.

As described above, according to the present invention, a mold-shaped mold, which is a box-shaped structure having an open top and made of a film having a certain thickness capable of forming plastic or the like, is poured continuously onto an open upper part of a drainage channel or a hollow pipe, It is possible to maintain the correct size of the concrete lid at the upper part of the drainage channel or the common channel and also to maintain the same strength with a smaller standard than the conventional concrete lid when the mold type form is not removed from the concrete lid The concrete cover can be stably fixed to the open upper part of the drainage duct or the common pipe so that the same strength can be maintained even when the reinforcing bars are used less, It is possible to mass-produce high-quality, high-quality products that are standardized and robust by locating concrete molds in the form of a large-volume casting mold, and then transferring them to the required place and spreading the required amount. In addition, the produced product is surrounded by the film of the die, so that it provides a buffering force when facing a neighboring product, so that it can be expected to have a stable structure against external impact.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a mold-type die having a bent portion for forming a handle groove according to an embodiment of the present invention; FIG.
FIG. 2 is a perspective view showing a structure of a mold type mold having a tubular body for forming a drain hole according to an embodiment of the present invention. FIG.
3 is a perspective view showing a structure of a concrete lid having a handle groove formed by integrating a mold-type die as an embodiment of the present invention.
4 is a perspective view showing a structure of a concrete lid in which an upper ring integrated with a mold type die is formed as an embodiment of the present invention.
5 is a perspective view showing a structure of a concrete lid having a drain hole formed by integrating a mold-type die as an embodiment of the present invention.
FIG. 6 is a perspective view showing a state in which a concrete lid is installed on a drainage channel or a common channel by using the mold-type mold of FIG. 1 according to an embodiment of the present invention;
FIG. 7 is a perspective view showing a state in which a concrete lid is installed in a drainage channel or a common channel by using the mold-type mold of FIG. 2 according to an embodiment of the present invention;

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

FIG. 1 is a perspective view showing a structure of a mold-type mold having a bent portion for forming a handle groove according to an embodiment of the present invention, FIG. 2 is a perspective view showing a structure of a mold-type mold having a tube for forming a drain hole according to an embodiment of the present invention And FIG. 3 is a perspective view showing a structure of a concrete lid having a handle groove formed by integrating a mold-type die as an embodiment of the present invention.

FIG. 4 is a perspective view showing a structure of a concrete lid having an upper ring integrated with a mold-type die according to an embodiment of the present invention, FIG. 5 is a perspective view showing a structure of a concrete lid having a drain hole integrated with a mold- FIG. 6 is a perspective view showing a state in which a concrete lid is installed in a drain or a common pipe by using the mold-type mold of FIG. 1 according to an embodiment of the present invention. FIG. And shows a state in which a concrete lid is installed on a drainage channel or a common channel by using a mold-type die.

1 to 7, a concrete lid according to an embodiment of the present invention includes a mold body 10 and a lid body 20 integrally or separately.

The mold-shaped mold 10 is a box-shaped structure made of a plastic material and made of a film 10a having a predetermined thickness capable of being molded. The mold-shaped mold 10 is formed in an inner wall surface according to the shape of the cover body 20 to be molded And a plurality of ribs 12 for connecting the right and left wall bodies are continuously formed on the inner surface of the bending portion 11 so that the knob groove 21 can be formed.

Here, the ribs 12 are formed by pouring concrete into the inside of the cushion 10a having a predetermined thickness that forms a wall and a bottom surface of the cushioning body 10 so as to stably maintain the box- And the coating 10a constituting the lower surface serve as shock-absorbing pads.

That is, when the cover 10 is integrated with the cover body 20, the coating 10a forming the wall and the bottom surface is configured to be able to maintain a stable state against external impact while providing a buffering force when hitting a neighboring product .

At this time, a tube 13 for forming a drain hole 23 in the lid body 20 is formed in the rib 12 of the mold-type die 10 according to the shape of the lid body 20 to be formed You can do it.

An iron core receiving groove 14 is repeatedly formed on the inside of the rib 12 for stable alignment of the reinforcing iron core (not shown).

Here, the rib 12 is formed to have a height of 1/2 with respect to the entire height of the mold-type mold 10. The concrete is laid and cured in the mold-type mold 10, (15) for guiding the cover body (20) to partly or entirely separate from the cover body (20).

That is, even if a part of the coating 10a of the wall forming the mold-type mold 10 is separated from the cover body 20 through the incision 15, the total height of the mold- The ribs 12 having a height of / 2 can be supported by the non-separated coating 10a.

The mold type die 10 may have a step portion 16 at the upper and lower boundaries and the step portion 16 may be mounted on the drain or the upper portion of the common pipe 100.

The lid body 20 is formed by pouring and curing concrete with the mold type die 10 together with the handle groove 21, and an upper ring 22 is formed on the upper surface thereof.

As shown in FIGS. 1 to 7, the construction of the concrete lid having the above-described structure is made up of a plastic-like box-shaped structure having an upper open portion formed of a coating 10a having a predetermined thickness, The mold-type mold 10 in which the ribs 12 connecting the coatings 10a of the left and right walls are continuously formed on the inner surface thereof is arranged in a multistage arrangement on the open upper part of the drainage channel or the common channel 100.

Here, in the above process, the mold-shaped mold 10 may be mounted on the open top of the drainage or common conduit 100 through the step portion 16 formed at the upper and lower boundaries, The reinforcing iron core may be placed on the iron core receiving groove 14 repeatedly formed on the rib 12 of the mold-type die 10.

That is, the iron core inserting groove 14 can stably align the position of the reinforcing iron core when the reinforcing iron core is laid.

In the above process, the upper ring 22 may be formed on the upper surface of the lid body 20, and the tube body 13 may be formed on the mold die 10 to form the lid body 20 The drain hole 23 may be formed.

That is, as shown in FIGS. 6 and 7, concrete is continuously poured and cured by using a concrete pouring apparatus in the mold-type die 10 arranged in a multi- The body 20 is formed by using the mold die 10 to form the upper ring 22 on the upper surface and / or the drain hole 23 on the upper surface of the lid body 20 to be formed will be.

The following process is to be carried out from the lid body 20 formed from the above process to keep the coating 10a including the wall forming the mold-like form 10 and the lower floor as it is, It is possible to complete the construction of the concrete lid in the drainage channel or the common pipe 100 by separating part or all of the mold-type die 10.

Here, if the cover body 20 is kept in the engaged state without detaching the mold-type mold 10, the concrete lids in which the continuous construction is performed can prevent the waving due to the impact of adjacent lids, This is because the ribs 12 continuously formed to connect the right and left walls act as buffer pads.

When the mold-type mold 10 is removed from the lid body 20, the upper and lower ends of the mold-type mold 10, the upper and lower ends of the mold- Type mold 10 at the boundary between the concrete lids, and the ribs 12 are arranged on the basis of the cut-out 15 as a part of the wall Even if the film 10a is separated, its height is 1/2 of that of the mold-type mold 10 and can be provided with its supporting force by the unseparated film 10a, so that the box-like structure constituting the mold- .

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that such changes and modifications are within the scope of the claims.

10; Mold type die 10a; film
11; A bent portion 12; live
13; Tube 14; Iron core
15; Section 16; Jaw
20; A cover body 21; Handle groove
22; Upper ring 23; Drainage
100; Drainage or common conduit

Claims (9)

A box-shaped structure having an open upper part, which is molded into a film having a predetermined thickness constituting a wall and a bottom surface, and stably maintains a box-like structure when concrete is poured therein; And a lid body which is molded at the time of curing by placing the concrete in the mold type die; And,
The concrete is placed on the inner surface of the mold-type die to stably maintain the box-like structure when the lid body is molded, and a plurality of The ribs are continuously formed,
Wherein the mold-type die is separated from the lid body or is integrally formed with the lid body.
The method according to claim 1,
A reinforcing core is formed inside the cover body,
And an iron core receiving groove for stably aligning the reinforcing iron core is repeatedly formed on the inside of the rib.
2. The on-site concrete cover as claimed in claim 1, wherein the ribs are formed at a height of 1/2 of the total height of the mold-shaped moldings. 2. The on-site concrete lid of claim 1, wherein the mold-type die is provided with a cut-away portion enabling separation from the lid body. [6] The concrete cover as claimed in claim 4, wherein when the mold-type mold is separated from the lid body, the mold-type mold is partially separated or entirely separated through the incision. The mold-type structure, which is an open-topped box-like structure, is molded into a film having a certain thickness that forms the wall and the bottom surface, and the mold-type mold that stably maintains the box-like structure when the concrete is poured therein is arranged in a multi- A first step of putting the substrate on the substrate;
A second step of continuously casting and curing the concrete by using a remicon truck on the mold-type die arranged in multi-stages, thereby molding the cover body; And
A third step of keeping the mold type die from the lid body formed from the second step or separating part or all of the mold type die from the lid body; ≪ / RTI >
Wherein the ribs continuously formed on the inner surface of the mold-type mold when the cover body and the mold-type mold are integrally held serve as shock-absorbing pads while stably maintaining the box-shaped structure of the mold- Construction method.
7. The process of claim 6, wherein in the first step, the mold-type die is mounted on an open upper portion of a drainage channel or a common channel via a step formed at upper and lower boundaries; The method of claim 1, further comprising: 7. The method of claim 6, further comprising: a step of disposing a reinforcing iron core in a ferrule holding groove repeatedly formed in a rib of the mold-shaped die in the first step; The method of claim 1, further comprising: The method according to claim 6, wherein, in the third step, when separating the mold-type mold from the lid body, separating the upper or lower end or all of the upper and lower ends of the mold- ; The method of claim 1, further comprising:
KR1020150173168A 2015-12-07 2015-12-07 Concrete Covering Structure Using Mould and Constructing Method of the Same KR101776061B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150173168A KR101776061B1 (en) 2015-12-07 2015-12-07 Concrete Covering Structure Using Mould and Constructing Method of the Same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150173168A KR101776061B1 (en) 2015-12-07 2015-12-07 Concrete Covering Structure Using Mould and Constructing Method of the Same

Publications (2)

Publication Number Publication Date
KR20170066928A true KR20170066928A (en) 2017-06-15
KR101776061B1 KR101776061B1 (en) 2017-09-07

Family

ID=59217410

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150173168A KR101776061B1 (en) 2015-12-07 2015-12-07 Concrete Covering Structure Using Mould and Constructing Method of the Same

Country Status (1)

Country Link
KR (1) KR101776061B1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3181740B2 (en) * 1992-12-18 2001-07-03 株式会社熊谷組 Aggregate cooling device
JP3119043B2 (en) * 1993-07-28 2000-12-18 キヤノン株式会社 Lens barrel
KR100337158B1 (en) * 1999-06-26 2002-05-18 이 상 종 A manufacturing method of cover for civil engineering

Also Published As

Publication number Publication date
KR101776061B1 (en) 2017-09-07

Similar Documents

Publication Publication Date Title
CN101417484A (en) Forming die for concrete-filling core die
CN205580844U (en) But reuse's reinforced concrete beam type test piece pouring mold
RU2013158938A (en) SUBSURFACE REFRIGERATORS FOR IMPROVEMENT OF FORMATION OF TOOTH OF AUTOCHAIN OF RAILWAY CARS
CN101107407A (en) A molding equipment and method to manufacture stackable inter-engaging brics, blocks, stones and the like with a smooth or embossed face
KR20080006425U (en) Mould apparatus concret pannel
KR101776061B1 (en) Concrete Covering Structure Using Mould and Constructing Method of the Same
KR20080001074U (en) Take out apparatus of concrete mould
CN201099990Y (en) Hole reserving mould for pipeline perforation in architecture
US8894902B2 (en) Method and apparatus employing modular engageable components for formation of maintenance hole platforms
CN111361004A (en) Manufacturing method of pier stud prefabricated part and pier
KR102118881B1 (en) Frame for constructing bathroom and method for constructing bathroom floor using the same
CN209999415U (en) Preparation mould of assembled concrete external wallboard
KR101869387B1 (en) Simplified concrete filling method for steel tube using the same
TWI700168B (en) Precast concrete mould
JP2011122300A (en) Side ditch block for drainage pavement, form thereof, and drainage road structure
CN110774424A (en) Cast-in-place mould assembly for lawn bricks
CN102310472B (en) Forming mold for hollow box
CN110014505B (en) Method for fastening a side wall element and side wall element
CN220219021U (en) Prefabricated building component line box fixing device and prefabricated building component mould platform
RU190485U1 (en) FORM FOR MANUFACTURING PRODUCTS FROM CONCRETE AND REFRACTORIES
KR100921167B1 (en) Molding method for producing pallet and products thereof
CN214419115U (en) Die for manufacturing movable core rib in hollow floor slab
CN107571458B (en) Fixing structure for hoisting inserts
CN102310469A (en) Forming mold for hollow box
JP2022046053A (en) Formwork device and method for producing hollow concrete member

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant