Field of Invention
The present invention relates to a device useful to construct a concrete structure in buildings. The device is a plastic formwork panel assembly which comprises a plurality of panel members which are firmly cormected to several reinforcing members by holding members.
Background of the invention
These types or devices are known in the art and such device comprises of a single plastic panel member and a plurality of plastic panel members which are connected in longitudinal sides thereof to each other by the tightening bolts fitted in grooves of the standard panel member, and connected in lateral sides by the tightening bolts. Since the panel members are made of plastic material and are connected by the tightening bolts only, a metal supporting frame system is required to support such a shuttering assembly to form a large assembly with sufficient strength.
The metal supporting frame system, which is used to support the formwork panel assembly, comprises a large number of reinforcing and connecting members for assembling the panel members, which results in a protraction of construction periods, lowering productivity and increasing construction costs.
Therefore, a formwork panel assembly which is able to firmly connect the reinforcing members with the formwork panel members, which is not only simple in structure but also capable of quickly erecting and suitably employing when constructing the large buildings is required.
Summary of the invention
In order to obviate with the drawbacks of prior arts and to achieve the objects, in the present invention a device is provided for constructing a concrete structure comprising; a plurality of plate-formed panel members in substantially square or rectangular shape with edges adapted for being coupled accordingly to each other. Each of the panel members provided with at least a substantially flat first side, a second side opposite to the first side and engaging means formed thereon, a plurality of reinforcing members in the form of substantially

oblong parts so adapted that one of the longitudinal surfaces thereof is pressed against the second side of the panel members, a plurality of holding members including a first portion and a second portion connected to the first portion via a third portion, wherein a plurality of mating engaging means formed on each of said first and second portions of the holding members and adapted so as to interlock with the engaging means disposed on the second side of said panel members, and the panel members are firmly connected to the reinforcing members by the holding members so as to form the formwork panel assembly.
The configuration of the above holding members, the panel members are fixedly connected to the reinforcing members to thereby form a device for constructing concrete structures. This formwork panel assembly enhance the loading property relative to a single panel member and therefore successfully can be used in shuttering systems to construct a concrete structure such as a large wall, post, foundation or the like.
The mating engaging means disposed on each of the first and second portions of the holding members. The same are provided in the form of engaging lugs. The engaging means of the panel members are provided with a plurality of opening portions adapted so as to interlock with the mating engaging means of the holding members.
The reinforcing members are substantially disposed in a first and second direction of the formwork panel assembly during constructing. Preferably, the first and second directions are substantially perpendicular to each other.
The holding members:
comprise a first, second and third portions which are separated from each other. The third portion is detachably attached to the first and second portions, wherein the third portion which is made of high friction material such as leather, fabric or the like is preferably in the form of a band. With the structure of the three separated portions, the holding members can be quickly mounted and suitably incorporated with a reinforcing member having non-standard sizes; comprises of the materials that feature such mechanical properties that two mating engaging means of the holding members are generally capable of being elastic when they are subjected to a force which is applied to vary a distance there between and the holding members

preferably are made of plastic material having proper durability and are produced by injection
molding and have a substantially U-shape, which is composed of a base and two arms and each
of the mating engaging means is located in each arm of this U-shape
and are substantially an integral member having the mating engaging means adapted to engage
with the engaging means of the form work panel member. The holding member is composed of
at least a pair of mating engaging means spaced apart from each other a predetermined
distance.
Details of the Drawings
The present invention will be described in more detail with reference to the accompanying drawings, in which:
1. Perspective view illustrating a formwork panel member fig-1
2. Perspective view illustrating a plastic formwork panel assembly with a holding member according to an embodiment of the invention, fig-2A and 2B.
3. Exploded perspective view illustrating the members shown in fig.2-fig-3
4. Perspective view illustrating a holding member, a formwork panel member and a reinforcing member in a mutually fixedly connected state fig-4
5. Perspective view illustrating a plastic formwork panel assembly with a holding member according to another embodiment of the invention. Fig-5A to 5D
Fig.l, a formwork panel member A is made of plastic material, a face B of the formwork panel member A is flattened, a opposing face C is provided with a plurality of longitudinal ribs D and lateral rib E so that the ribs establish a rigid rib frame. A plurality of counterboring portions F is formed on the longitudinal and lateral ribs. These counterboring portions F are sized and adapted to serve as an engaging means for the formwork panel members in two directions, preferably vertical and horizontal directions. A plurality of T-shaped grooves H are formed on each of the outer longitudinal walls G of the formwork panel members A Several rectangular holes J are formed on each of the ends walls I of the formwork panel members A. Dimensions of

rectangular holes J are slightly larger than the cross-section of a conventional T-shaped tightening bolt.
Figs. 2-5, the formwork panel members A are evenly connected by the lateral edges thereof by placing the formwork panel members side -by-side in such a manner that the lateral edges I are pressed against to each other, the longitudinal edges G of the formwork panel members A are connected together by means of T- Shaped tightening bolts and L- Shaped locks as already known. When constructing the larger surfaces of a wall or a floor, many formwork panel members can be connected by the longitudinal edges C and/or by in the lateral edges I and cooperate with reinforcing members as described above to form a plastic formwork panel assembly.
In the embodiment of Fig. B, a plurality of holding members Bl is used to fixedly connect the plastic panel member A to a reinforcing tube (reinforcing member) B. The holding member Bl substantially comprises a first portion B11, a second portion B12 and a third portion B13 which links the first portion B11 and second portion B12 together. Each of the mating engaging means Bll and B 12a is formed at the ends of the first portion Bl 1 and the second B12, respectively.
Preferably, mating engaging means are engaging lugs which are sized so as to interlock with the counterboring F (engaging means) of the formwork panel members A.
In the above embodiment, three portions Bll, B12 and B13 of the holding member are integrally formed and the holding members are made of the material which features such mechanical properties that their two mating engaging means have elasticity when they are subjected to a force which is applied to vary the distance therebetween. Advantageously, the holding member is made of plastic material having sufficient strength and produced by injection molding method.
In other embodiment, as shown in Fig. 5, A to D three potions B11,B12, B13 of the holding member are separately formed wherein the third portion B13 is shaped in the form of a band and is detachably coupled to the first and second portion B11 and

B12. Preferably, the third portion is made of a material having a high friction coefficient such as leather, fabric or the like.
Next, the method for assembling the holding member in the plastic pane member assembly of the invention will be described wit reference to Figs. 4 and 5. Firstly, the panel members Al are coupled together along the longitudinal edges A16 and the lateral edges A18 by means of the methods which are already known, and therefore the description ther4of is omitted herein. Then, the reinforcing members are positioned in relation to the panel members so that one surface C11 of the reinforcing member C1 is brought in contact with the panel members A. In the next step, the holding members B1 are inserted into the predetermined places with respect to the panel members A1 so that the mating engaging means of the holding members Bl are engaged with engaging means of the panel members Al. Finally, a tension generating means such as a wedge member D1 (see Fig. 3) or an eccentric member (se Fig. 5 ) is inserted into a gap formed between the portion B13 of the holding members Bl and the surface C12 of the reinforcing member C1 so that a tensional force is generated to fixedly connect the panel members A1 to the reinforcing members C1. STATEMENT OF THE INVENTION:
The present invention provides a plastic made device useful to construct concrete structure in building comprising of a plurality of plate-formed panel members in a substantially square or rectangular shape with edges adapted for being coupled accordingly to each other, each of the panel members provided with at least a substantially flat first side, a second side opposite to the first side and engaging means formed thereon;
reinforcing members in the form of substantially oblong parts so adapted that one of the longitudinal surfaces thereof is pressed against the second side of the panel members:
holding members including a first portrion and a second portion connected to the first portion via a third portion, characterized in that mating engaging means formed on each of said first and second portions of said holding members and adapted so as to interlock with the engaging means disposed on the second side of said panel members, and said

panel members are fixedly connected to said reinforcing members by said holding members so as to form the formwork panel assembly.
PREFERRED EMBODIEMENTS: The present invention prefers the following preferred embodiments of the Invention:
A plastic made device useful to construct concrete structure in building, wherein said mating engaging means disposed on each of said first and second portions of said holding members comprises a plurality of engaging lugs.
A plastic made device useful to construct concrete structure in building, wherein said engaging means of said panel members comprise a plurality of opening portions adapted for interlocking with said mating engaging means of said holding members.
A plastic made device useful to construct concrete structure in building, wherein said reinforcing members are disposed substantially in a first and second directions.
A plastic made device useful to construct concrete structure in building, wherein said first and second directions are substantially perpendicular to each other.
A plastic made device useful to construct concrete structure in building, further comprising a tension generating means located between said third portion of said holding members and said reinforcing members so as to apply a tensional force to secure said formwork panel member to said reinforcing members.
A plastic made device useful to construct concrete structure in building wherein said tension generating means comprise a wedge.
A plastic made device useful to construct concrete structure in building , wherein said tension generating means comprise eccentric members.
A plastic made device useful to construct concrete structure in building, wherein said first, second and third portion of said holding members are integrally formed into a substantially U-shaped.

A plastic made device useful to construct concrete structure in building, wherein said holding members are made from the materials that feature such mechanical properties that the first and second portions carrying the mating engaging means of said holding members are generally capable of being when said portions are subjected to a force which is applied to vary a distance there between.
A plastic made device useful to construct concrete structure in building , wherein said mating engaging means disposed on said first and second portions of said holding members are spaced apart from each other by a predetermined distance.
A plastic made device useful to construct concrete structure in building, wherein said holding members are made of plastic material having a proper durability.
A plastic made device useful to construct concrete structure in building, wherein said holding members made of the plastic material is produced by injection molding.
A plastic made device useful to construct concrete structure in building, wherein a connection between the first and second portions with the third portion of said holding members is a detachable cormection.
A plastic made device useful to construct concrete structure in building , wherein the third portion of said holding members is in the form of a band.
A plastic made device usefiil to construct concrete structure in building wherein the material of the third portion of said holding members is a high friction material that is selected from a group of leather, fabric or the like.
A plastic made device useful to construct concrete structure in building , wherein said first and second portions of said holding members are made of a plastic material having a proper durability.
A plastic made device usefiil to construct concrete structure in building, wherein said holding members made of the plastic material are produced by injection molding.

The formwork panel assembly using the holding members for fixedly connecting the panel members to reinforcing members is described only to exemplify the present invention. However, it should be understood that the invention is not limited to the above embodiments and various modifications and variations of formwork panel assembly with holding members may be made without departing from the scope of this invention as defined in the appended claims.

I CLAIM
1. A plastic made device useful to construct concrete structure in building comprising of a
plurality of plate-formed panel members in a substantially square or rectangular shape
with edges adapted for being coupled accordingly to each other, each of the panel
members provided with at least a substantially flat first side, a second side opposite to
the first side and engaging means formed thereon;
reinforcing members in the form of substantially oblong parts so adapted that one of the longitudinal surfaces thereof is pressed against the second side of the panel members: holding members including a first portrion and a second portion connected to the first portion via a third portion, characterized in that mating engaging means formed on each of said first and second portions of said holding members and adapted so as to interlock with the engaging means disposed on the second side of said panel members, and said panel members are fixedly connected to said reinforcing members by said holding members so as to form the formwork panel assembly.
2. A plastic made device useful to construct concrete structure in building as claimed in claim 1, wherein said mating engaging means disposed on each of said first and second portions of said holding members comprises a plurality of engaging lugs.
3. A plastic made device useful to construct concrete structure in building as claimed in claim 1, wherein said engaging means of said panel members comprise a plurality of opening portions adapted for interlocking with said mating engaging means of said holding members.
4. A plastic made device useful to construct concrete structure in building as claimed in claim 1, wherein said reinforcing members are disposed substantially in a first and second directions.
5. A plastic made device usefiil to construct concrete structure in building as claimed in claim 4, wherein said first and second directions are substantially perpendicular to each
other.

6. A plastic made device useful to construct concrete structure in building as claimed in claim 1, further comprising a tension generating means located between said third portion of said holding members and said reinforcing members so as to apply a tensional force to secure said formwork panel member to said reinforcing members.
7. A plastic made device useful to construct concrete structure in building as claimed in claim 6, wherein said tension generating means comprise a wedge.
8. A plastic made device useful to construct concrete structure in building as claimed in claim 6, wherein said tension generating means comprise eccentric members.
9. A plastic made device useful to construct concrete structure in building as claimed in claim 1, wherein said first, second and third portion of said holding members are integrally formed into a substantially U-shaped.
10. A plastic made device useful to construct concrete structure in building as claimed in claim 9, wherein said holding members are made from the materials that feature such mechanical properties that the first and second portions carrying the mating engaging means of said holding members are generally capable of being when said portions are subjected to a force which is applied to vary a distance therebetween.
11. A plastic made device useful to construct concrete structure in building as claimed in claim 9, wherein said mating engaging means disposed on said first and second portions of said holding members are spaced apart from each other by a predetermined distance.
12. A plastic made device useful to construct concrete structure in building as claimed in claim 9, wherein said holding members are made of plastic material having a proper durability.
13. A plastic made device useful to construct concrete structure in building as claimed in claim 12, wherein said holding members made of the plastic material is produced by injection molding.

14. A plastic made device useful to construct concrete structure in building as claimed in claim 1, wherein a connection between the first and second portions with the third portion of said holding members is a detachable connection.
15. A plastic made device useful to construct concrete structure in building as claimed in claim 14, wherein the third portion of said holding members is in the form of a band.
16. A plastic made device useful to construct concrete structure in building as claimed in claim 14, wherein the material of the third portion of said holding members is a high friction material that is selected from a group of leather, fabric or the like.
17. A plastic made device useful to construct concrete structure in building as claimed in claim 14, wherein said first and second portions of said holding members are made of a plastic material having a proper durability.
18. A plastic made device useful to construct concrete structure in building as claimed in claim 17, wherein said holding members made of the plastic material are produced by injection molding.
19. A plastic made device useful to construct concrete structure in building such as herein described with reference to the foregoing description and drawings.