JP6438162B1 - Deck plate - Google Patents

Abstract

Provided is a deck plate that does not require a support work during construction of a concrete slab and can be easily recovered from a formed concrete slab and reused. A deck plate 1a according to the present invention includes mold members 52 and 53, and a bolt hole 2 in which a female screw portion is formed on an inner peripheral surface is formed on a lower surface 57c of a square pipe 57 constituting the mold member 52. The bolt 3 that is screwed into the female screw portion is screwed into the bolt hole 2 so that the lower surface 56c of the square pipe 56 can be pressed by a tip 3a that protrudes into the square pipe 57. [Selection] Figure 1

Description

  The present invention relates to a deck plate used as a part of a formwork when forming a concrete slab on a floor, a ceiling, or the like of a building, and more particularly to a deck plate that does not require a support during construction of the concrete slab.

In a building using reinforced concrete or steel reinforced concrete as a structural material, a deck plate obtained by processing a steel plate material may be used as a part of a form for forming a concrete slab.
In general, the deck plate is removed after slab construction for reuse, but conventionally the deck plate was welded to the top surface of the beam or fixed to the beam by bolting etc., so after the concrete solidified Was buried in the formed slab, and it was extremely difficult to take out the used deck plate from the slab.

Therefore, in recent years, a deck plate having a structure that can easily change the overall length is often used. Here, the structure of such a deck plate will be described with reference to FIG.
6 (a) is a front view of a conventional deck plate, and FIGS. 6 (b) and 6 (c) are plan views of two types of formwork members constituting the deck plate shown in FIG. 6 (a). It is. 6B and 6C correspond to views showing a state in which the deck plate viewed in the direction indicated by the arrow Y in FIG. 6A is disassembled into two mold members.

  As shown in FIGS. 6 (a) to 6 (c), the conventional deck plate 51 includes flat plates 54 and 55 whose upper surfaces 54a and 55a become molding surfaces when placing concrete, and these flat plates 54 and 55. Steel plate mold members 52 and 53 having a thickness of about 0.8 mm, which are formed by square pipes 56 and 57 fixed to the lower surfaces 54b and 55b of the steel plates by welding, bonding, rivets or screws.

  One end of each of the square pipes 56 and 57 is pressed and deformed in a flat shape, and a long steel plate member (not shown) is formed so as to close the end (hereinafter referred to as flat ends 56b and 57b). It is inserted inside. The outer diameter of the square pipe 56 is smaller than the inner diameter of the square pipe 57, and the opening end 56a is formed so as to be inserted into the opening end 57a.

The upper surface of the square pipe 56 is spot-welded to the flat plate 54 at two locations near the center in the longitudinal direction and near the flat end 56b. The upper surface of the square pipe 57 is near the center in the longitudinal direction with respect to the flat plate 55. Three spots near both ends are spot welded. That is, the square pipe 56 is joined to the lower surface 54b of the flat plate 54 except for a portion within a desired distance from the opening end 56a.
Thus, the mold member 52 inserts the square pipe 56 into the square pipe 57 of the mold member 53 so that the flat plate 55 is placed between the lower surface 54b of the flat plate 54 and the upper surface of the square pipe 56. The length can be interpolated.

That is, the deck plate 51 connects the mold member 52 to the mold member 53 such that the open end 56a side of the square pipe 56 is inserted into the square pipe 57 from the open end 57a side. ) By sliding the mold members 52 and 53 to each other as indicated by an arrow X, the total length can be easily adjusted.
Since the flat plates 54 and 55 are as thin as about 0.8 mm, the flat plate 55 is inserted between the lower surface 54b of the flat plate 54 and the upper surface of the square pipe 56, and a part of the flat plates 54 and 55 is overlapped. Even when concrete is placed on the upper surfaces 54a and 55a, there is no possibility that the concrete will enter between the lower surface 54b of the flat plate 54 and the upper surface 55a of the flat plate 55.

Next, a concrete slab construction method using the deck plate 51 will be described with reference to FIG. FIGS. 7A and 7B are diagrams schematically showing how a concrete slab is formed.
As shown in FIG. 7A, first, a support 59 is assembled on a slab 58 or the like on a lower floor that has already been formed, and a beam formwork 60 is installed on the support 59.
Next, after the mold members 52 and 53 are slid to adjust the whole to an appropriate length, both ends are attached to the upper surfaces of the square members 61 and 61 fixed to the sides of the two opposite beam molds 60 and 60. The deck plate 51 is installed so as to be placed respectively.

Further, after a sleeper 62 is placed on a support 59 installed between the beam forms 60 and 60 to support the central portion of the deck plate 51, the upper surfaces of the flat plates 54 and 55 of the plurality of deck plates 51. Slab molds (not shown) made of reinforcing bars are formed on 54a and 55a, and concrete is placed in the slab molds.
The slab formwork and support 59 or the beam formwork 60 and deck plate 51 are removed at the stage where the concrete has solidified and the beams 63 and slabs 64 are formed. If 59 is removed at a time, the deck plate 51 that has lost its support may fall inadvertently. Therefore, a new support 59 is usually installed on the predetermined deck plate 51 for the purpose of supporting a place different from the place supported by the sleepers 62 (see FIG. 7B).
And after removing all the deck plates 51, the said slab formwork, the supporting work 59, and the beam formwork 60 are removed.

As shown in FIG. 7B, when the deck plate 51 is in a state of being bridged between the square members 61 and 61 fixed to the side portions of the beam mold frames 60 and 60, the deck plate 51 includes A bending moment that causes the central portion in the longitudinal direction to bend the most is generated.
If the deck plate 51 is bent by the action of the bending moment, problems such as failure to maintain the flatness of the slab 64 occur. Therefore, when the concrete slab is formed using the deck plate 51, as described above. The installation of a support 59 is essential.
However, when the support 59 is used in this way, not only the material cost is required, but it takes time to install and remove, and the entire construction period becomes long, so that there is a problem that the work cost increases. .

Although it is not the structure which can change the full length like the deck plate 51, for example, the patent document 1 describes the slab construction method which does not require a support work.
The invention disclosed in Patent Document 1 is named “honeycomb-type deck plate” and is characterized in that two deck plates that are vertically symmetrically stacked are integrated by welding at the overlapping portion.
In the deck plate having the above-described structure, it is possible to easily form a camber (removal) corresponding to the bending at the time of placing concrete. When the camber is formed on the deck plate in this way, the bending of the central portion in the longitudinal direction caused by the action of the bending moment is reduced, so that the installation of the support can be omitted when constructing the concrete slab.

Japanese Patent Laid-Open No. 11-117441

  In the invention disclosed in Patent Document 1, although there is a merit that the installation of a support slab can be omitted at the time of concrete slab construction, since it is not a structure that can change the overall length, after the concrete slab is formed, It is not easy to take out the used deck plate from. Therefore, the invention disclosed in Patent Document 1 has a problem that the deck plate cannot be reused.

  The present invention has been made in response to such a conventional situation, does not require a support work during the construction of the concrete slab, and can be easily recovered and reused from the formed concrete slab. An object is to provide a deck plate that can be used.

  In order to achieve the above object, a first invention is a deck plate used as a part of a formwork when forming a concrete slab on a floor or ceiling of a building, and is flattened from one end to a desired length. The first square pipe and the second square pipe, each of which is flattened and formed so that the open ends can be inserted, and the upper surface of the first square pipe is within a desired distance from the open end. The first flat plate joined to the lower surface except for the location of the second square plate, the second flat plate in which the upper surface of the second square pipe is joined to the lower surface, and the first plate provided on the lower surface of the second square pipe A bolt that is screwed into the bolt hole, and the first flat plate and the second flat plate are arranged so that the first square pipe and the second square pipe can be inserted into the second square pipe. The first bolt holes are respectively joined to the pipes, and the second square holes And it is characterized in that it is formed a lower surface of the first square pipes by the tips of the threaded by a bolt so as to protrude into the interior of flops can press location.

  In the present invention, the “desired length or distance from the end of the first square pipe or the second square pipe” means “measured along the longitudinal direction of the first square pipe or the second square pipe”. Means “length or distance”. Further, in the following description, “inserting the first square pipe in a state inclined to the second square pipe” means “the longitudinal direction of the first square pipe and the longitudinal direction of the second square pipe are parallel to each other”. The first square pipe is interpolated into the second square pipe in a state that is not. "

When forming a concrete slab in a structure that uses reinforced concrete or steel reinforced concrete as a structural material, the deck plate of the above structure is placed on the side of the beam form or on the top of the square member that is fixed to the H-shaped steel flange via a support. When the first square pipe is inserted with the first square pipe tilted with respect to the second square pipe so that the open end thereof is inclined upward, the open end portion of the second square pipe is It has a function of becoming a convex state and forming a camber.
The camber includes “the inclination of the first square pipe with respect to the second square pipe”, “the length of inserting the first square pipe into the second square pipe” and “the first square pipe and the first square pipe. According to the ratio of the lengths of the two square pipes, the amount and the position in the horizontal direction change.
Further, the bolt pushes the lower surface of the first square pipe with the tip, so that the first square pipe inserted while being inclined with respect to the second square pipe is centered on the flat portion side by its own weight. It has the effect | action of preventing rotating freely with a 1st flat plate in the direction in which the above-mentioned inclination is eliminated.

  In addition, when the flat part is bent downward, or when the whole is curved so that the central part in the longitudinal direction is the highest, the first square pipe becomes the second square pipe. The camber is formed even when the camber is inserted in parallel.

Moreover, 2nd invention is provided with the base which has a 2nd bolt hole screwed together with a volt | bolt in 1st invention, This base is a 1st bolt hole with respect to the lower surface of a 2nd square pipe. The second bolt holes are provided so as to communicate with each other.
In the deck plate having the above structure, the bolt screwed into the first bolt hole is in communication with the second bolt hole provided in the base. That is, in the second invention, in addition to the action of the first invention, the bolt screwed into the first bolt hole is held by the second bolt hole even when the plate thickness of the second square pipe is thin. Therefore, it has an effect that the central axis is not easily shaken when the bolt is turned.

According to a third invention, in the second invention, instead of the first bolt hole, an insertion hole through which the bolt is inserted is provided on the lower surface of the second square pipe so as to communicate with the second bolt hole. It is characterized by being.
In the deck plate having such a structure, in addition to having the action of the second invention, the bolt insertion hole is provided on the lower surface of the second square pipe as compared with the case where the first bolt hole is provided. There is an advantage that processing is easy.

In a fourth invention according to any one of the first to third inventions, the second square pipe is formed to be thicker than the other portions over a desired length from the opening end in the longitudinal direction. It is characterized by being.
When the first square pipe is inserted into the second square pipe, the opening is directed downward at the lower edge of the open end of the second square pipe that contacts the lower surface of the first square pipe. The force that tries to spread is easily intensively applied. Therefore, in the deck plate having the above structure, the plate thickness of the portion where the above-described force is concentrated is made thicker than other portions. As a result, the fourth invention has the effect that the strength of the open end of the second square pipe is high, in addition to the effect of any one of the first to third inventions.

In a fifth aspect based on the fourth aspect, the second square pipe has a reinforcing plate joined to the outer surface of the three side plates not contacting the second flat plate over a desired length from the opening end in the longitudinal direction. It is characterized by that.
In the deck plate having the above structure, in addition to the operation of the second invention, the strength of the open end of the second square pipe can be increased without changing the distance between the inner surfaces of the side plates at the place where the reinforcing plate is provided. It has the action.

According to a sixth invention, in the fourth invention, the second square pipe is characterized in that a reinforcing plate is joined to the inner surfaces of the four side plates over a desired length from the open end in the longitudinal direction. Is.
In the deck plate having the above-described structure, the distance between the inner surfaces of the side plates at the portion where the reinforcing plate is provided is shortened. Therefore, although the restriction on the size of the first square pipe is larger than that of the fifth invention, the second invention In addition to the above-described function, the strength of the open end of the second square pipe is further enhanced than that of the fifth aspect.

  In the fourth to sixth inventions, “from the opening end of the second square pipe to a desired length in the longitudinal direction” means “along the longitudinal direction from the opening end of the second square pipe” This means that the measured distance is within a desired range (perform predetermined processing or the like).

When a concrete slab is formed in a structure that uses reinforced concrete or steel reinforced concrete as a structural material, a deck plate is placed between a pair of square members fixed to the side of the beam form or the flange of the H-shaped steel via a support. When handed over, a bending moment is applied to the deck plate so that the central portion in the longitudinal direction is bent most greatly.
If the deck plate bends due to this bending moment, the position of the end of the deck plate placed on the top surface of the square bar will shift, and the installation state will change, or the flatness of the slab will not be maintained, etc. A malfunction will occur.
In order to prevent such a situation, a support work is usually used. However, if a support work is used, in addition to its own material cost, installation work and removal work are also expensive.

If it is a disposable deck plate whose total length does not change, the above-mentioned situation can be dealt with by providing a camber in the deck plate in advance by considering the amount of bending due to the bending moment without using a support. However, it is not easy to provide a camber in a conventional variable-length deck plate that is intended to be collected and reused after use.
On the other hand, according to the first invention, the first square pipe is tilted so that the opening end thereof is obliquely upward with the flat portion side installed on the upper surface of the above-mentioned square bar. Because the camber can be easily formed simply by interpolating into the slab, it is possible to simultaneously solve the two problems of reducing the construction cost of the concrete slab by omitting the support work and separating it from the concrete slab after use. Can do.

In the first invention, “the inclination of the first square pipe with respect to the second square pipe”, “the length of inserting the first square pipe into the second square pipe”, and “the first square pipe” By changing the ratio of “the length of the pipe and the second square pipe”, the position and amount of the camber can be adjusted, which is excellent in versatility.
Furthermore, in 1st invention, since there is no possibility that the attitude | position of a 1st square pipe or a 2nd square pipe may change in the middle of construction work of concrete slab, and a camber may be eliminated, it can work safely. it can.

In the first invention, when the side plate of the second square pipe does not have a thickness sufficient to maintain the posture of the bolt screwed into the first bolt hole, the center axis of the second square pipe is turned when the bolt is turned. Easy to shake. In this case, not only is it difficult to turn the bolt, but the force applied to turn the bolt is applied non-uniformly to the edge of the bolt hole, so that the portion may be damaged.
On the other hand, in the second invention, since the central axis of the bolt screwed into the first bolt hole is not easily shaken at the time of rotation, in addition to the effect of the first invention, workability when operating the bolt is improved. In addition, the first bolt hole is not easily damaged even when it is repeatedly reused.

When the plate | board thickness of the lower surface side of a 2nd square pipe is thin, it is not easy to process the 1st bolt hole which has an internal thread part in an internal peripheral surface. However, when the pedestal having the second bolt hole screwed with the bolt is provided on the lower surface of the second square pipe, it is not necessary to forcibly provide the first bolt hole. Therefore, in the third invention, in the second invention provided with the pedestal, a bolt insertion hole communicates with the second bolt hole in place of the first bolt hole with respect to the lower surface of the second square pipe. Thus, the structure is provided.
According to such a structure, since the method of providing the bolt insertion hole on the lower surface of the second square pipe is easier than the case of providing the first bolt hole, in addition to the effect of the second invention, There is an effect that the manufacturing cost is reduced.

  According to the fourth invention, in addition to the effect of any one of the first to third inventions, the opening end of the second square pipe is not easily damaged, and thus the effect that it can be reused repeatedly is achieved.

  In the fifth invention, since the first square pipe having the same size as that in the case where the reinforcing plate is not provided can be used, in addition to the effect of the fourth invention, there is an effect that the degree of freedom in designing is large.

  According to the sixth invention, since the opening end of the second square pipe is more difficult to break than the fifth invention, the effect of the fourth invention that it can be repeatedly reused is further exhibited.

(A) is the front view of Example 1 of the deck plate which concerns on embodiment of this invention, (b) is the elements on larger scale of the square pipe seen in the direction shown by arrow A in the figure (a). . FIG. 1A is a partially enlarged view of a square pipe and a flat plate showing a state cut in a vertical plane parallel to the longitudinal direction of the deck plate in FIG. 1A, and FIG. It is B line arrow sectional drawing. (A) and (b) schematically shows a state in which the square pipe of one mold member is inserted into the square pipe of the other mold member in the two types of mold members constituting the deck plate of the present invention. FIG. (A) is the front view of Example 2 of the deck plate which concerns on embodiment of this invention, (b) and (c) are CC sectional view taken on the line in FIG. (A) And (c) is the front view of Example 3 and Example 4 of the deck plate which concerns on embodiment of this invention, respectively, (b) and (d) are Example 3 and Example 4, respectively. It is the figure which showed the shape of the deck plate typically. (A) is a front view of a conventional deck plate, and (b) and (c) are plan views of two types of formwork members constituting the deck plate shown in FIG. (A) And (b) is the figure which showed typically a mode that concrete slab was formed.

The deck plate of the present invention will be specifically described with reference to FIGS. It should be noted that the deck plate of the present invention is provided with a support or the like on the side of the beam form shown in FIG. 7 or the flange of the H-shaped steel when a concrete slab is formed in a structure made of reinforced concrete or steel reinforced concrete. It is installed on the upper surface of the square bar to be fixed.
Therefore, in the following description, expressions such as “upper surface” and “lower surface” are used on the assumption that the deck plate is actually used as such.

FIG. 1A is a view showing a state in which the deck plate of the present invention is bridged between square members fixed to the side portions of two beam forms, and FIG. It is the figure which expanded and showed a part of square pipe seen in the direction shown by arrow A in a).
FIG. 2A is a partially enlarged view of a square pipe and a flat plate showing a state cut in a vertical plane parallel to the longitudinal direction of the deck plate in FIG. 1A, and FIG. It is a BB line arrow sectional view in).
3 (a) and 3 (b) show a state in which the square pipe of one mold member is inserted into the square pipe of the other mold member in the two types of mold members constituting the deck plate of the present invention. FIG.
In addition, about the component shown in FIG. 6 or FIG. 7, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 1 and 2, the deck plate 1 a according to the present invention includes mold members 52 and 53, and a lower surface 57 c of a square pipe 57 constituting the mold member 52 has a female screw portion on the inner peripheral surface. A bolt hole 2 (see FIG. 2A) is provided.
Then, the bolt 3 to be screwed into the female screw portion is screwed into the bolt hole 2 so that the lower surface 56c of the square pipe 56 can be pressed by the tip 3a (see FIG. 2B) protruding into the square pipe 57. Has been.

  The length of the portion where the square pipe 56 is inserted into the square pipe 57 is determined in advance so as not to be too short in consideration of safety. Therefore, when the bolt hole 2 is formed at a position where the distance from the open end 57a of the square pipe 57 to the bolt hole 2 is further shorter than the case where the length of inserting the square pipe 56 into the square pipe 57 is the shortest, The bolt 3 protruding to the inside of the square pipe 57 is in a state where the tip 3 a can come into contact with the lower surface 56 c of the square pipe 56.

Further, the lower surface 57c of the square pipe 57 has a structure in which a convex portion is provided on one surface of a plate member having a rectangular shape in plan view, and a female screw portion that is screwed into the bolt 3 is formed on the inner peripheral surface. A base 4 having a bolt hole 4a (see FIG. 2A) is provided so that the bolt hole 2 and the bolt hole 4a communicate with each other. In this case, the pedestal 4 has an action of holding the bolt 3 so that the central axis does not shake when the bolt 3 screwed into the bolt hole 2 is turned.
If the center axis of the bolt 3 is shaken, it is difficult to turn the bolt 3, and the force to turn the bolt 3 is applied unevenly to the edge of the bolt hole 2, so that the portion may be damaged, but the deck plate 1a Then, since the base 4 is provided with respect to the volt | bolt 3, it has the effect that it can not only damage the volt | bolt 3 but can prevent the volt | bolt hole 2 from being damaged.

Further, as shown in FIGS. 2A and 2B, in the deck plate 1a, the square pipe 56 is in a state where the longitudinal direction thereof is inclined with respect to the longitudinal direction of the square pipe 57 (that is, the longitudinal directions are Are not parallel, and can be inserted into the square pipe 57.
In the deck plate 1a having such a structure, the flat ends 56b and 57b are mounted on the upper surfaces of the square members 61 and 61 (see FIG. 7A) fixed to the side portions of the two beam molds 60 and 60, respectively. At the same time, when the square pipe 56 is inserted with the opening end 56a tilted with respect to the square pipe 57 so that the opening end 56a faces obliquely upward, the portion of the opening end 57a of the square pipe 57 becomes convex upward, and the camber (mu) A chestnut is formed.

As shown in FIGS. 3A and 3B, the plane P includes the upper surfaces of the two square members 61 and 61 (see FIG. 7A) from the edge on the opening end 57a side of the lower surface 57c of the square pipe 57. The distances L ₁ and L ₂ are equivalent to the above-described camber.
The lengths of L ₁ and L ₂ change by changing the inclination of the square pipe 56 with respect to the square pipe 57 and the length of inserting the square pipe 56 with respect to the square pipe 57. Further, the horizontal position at which the camber is formed is changed by changing the ratio of the lengths of the square pipe 56 and the square pipe 57 in addition to the inclination and the length to be interpolated.
That is, in the deck plate 1a, the camber amount and the horizontal position can be adjusted by changing the inclination of the square pipe 56 with respect to the square pipe 57 and the length of the square pipe 56 inserted into the square pipe 57. Yes.

Further, the bolt 3 presses the lower surface 56c of the square pipe 56 with the tip 3a, so that the square pipe 56 inserted in a tilted state with respect to the square pipe 57 has a flat end 56b (FIG. 1A). It has an effect of preventing the tilting together with the flat plate 54 in the direction in which the inclination is eliminated centering on the reference) side.
That is, in the deck plate 1a, a desired amount of camber can be easily provided at a desired position in the horizontal direction, and the camber is reliably maintained by the bolt 3, so that the safety during operation is excellent. Yes.
And according to the deck plate 1a, since it is not necessary to provide a supporting work when forming concrete slab, the cost required for construction of concrete slab is reduced.
In addition, since the deck plate 1a has a structure in which the entire length is variable, the work can be easily separated and collected from the formed concrete slab and can be reused.

4 (a) is a front view of Example 2 of the deck plate according to the embodiment of the present invention, and FIGS. 4 (b) and 4 (c) are views taken along line CC in FIG. 4 (a). It is sectional drawing.
FIG. 4C is a view showing a modified example of the deck plate shown in FIG. 4A, and corresponds to FIG. Moreover, about the component shown in FIG. 1 or FIG. 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 4A to 4C, the deck plate 1b includes a deck plate 1a in which a reinforcing plate 5 having a desired width is provided on the side plate of the open end 57a of the square pipe 57. Features.
As shown in FIG. 4A, when the square pipe 56 is inserted with the square pipe 56 inclined with respect to the square pipe 57, the square pipe 56 is in contact with the lower surface 56c of the square pipe 57 at the lower side of the open end 57a. A force to push the opening downward is concentrated on the edge. Therefore, the deck plate 1b has a structure in which the strength of the opening end 57a is increased by making the plate thickness in the vicinity of the opening end 57a thicker than other portions by the reinforcing plate 5.
In addition, about the part which the upper edge of the open end 56a of the square pipe 56 contacts with the square pipe 57, since sufficient intensity | strength is obtained with the flat plate 55 and the concrete slab formed on it, it will be damaged. There is no fear.

As described above, in the deck plate 1b, in the square pipe 57, the strength of the opening end 57a is secured by the reinforcing plate 5, and the portion is difficult to be damaged. Therefore, the deck plate 1b can be reused repeatedly.
In addition, as shown in FIG.4 (b), when joining the reinforcement board 5 to the outer surface of three side boards which are not in contact with the flat plate 55 in the square pipe 57, between the inner surfaces of the side boards in the location in which the reinforcement board 5 was provided. The strength of the open end 57a of the square pipe 57 can be increased without changing the distance. In this case, since the square pipe 56 having the same size as the case where the reinforcing plate 5 is not provided can be used, there is an advantage that the degree of freedom in designing is large.
On the other hand, as shown in FIG. 4C, when the reinforcing plate 5 is joined to the inner surfaces of the four side plates constituting the square pipe 57, the distance between the inner surfaces of the square pipe 57 is small at the location where the reinforcing plate 5 is provided. Since the thickness of the reinforcing plate 5 is shortened, although the size of the square pipe 56 is restricted, the strength of the open end 57a is increased as compared with the case shown in FIG. In this case, since the open end 57a of the square pipe 57 is not easily damaged, the effect that it can be reused repeatedly is further exhibited.

Fig.5 (a) is the front view of Example 3 of the deck plate based on embodiment of this invention, FIG.5 (b) is the figure which showed the shape typically. In addition, about the component shown in FIG. 1 or FIG. 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
As shown in FIGS. 5A and 5B, the deck plate 1c is characterized in that the flat ends 56b and 57b are bent downward in the deck plate 1a of the first embodiment.
In the deck plate 1c having such a structure, the flat ends 56b and 57b are placed on the upper surfaces of the square members 61 and 61 (see FIG. 7A) fixed to the side portions of the two beam frames 60 and 60, respectively. At the same time, when the square pipe 56 is inserted in parallel to the square pipe 57, the portions other than the flat ends 56b, 57b are disposed above the flat ends 56b, 57b, and a camber (removal) is formed. Is done.

At this time, the amount of camber varies depending on the angle of the bent flat ends 56b, 57b with respect to the square pipes 56, 57. That is, in the deck plate 1c, the amount of camber can be adjusted by changing the angle of the flat ends 56b, 57b with respect to the square pipes 56, 57.
In addition, the bolt 3 presses the lower surface 56c of the square pipe 56 with the tip 3a, so that the camber is eliminated due to the weight of the concrete placed on the upper surfaces 54a and 55a of the flat plates 54 and 55. It has a function of preventing the members 52 and 53 from moving easily.

Thus, in the deck plate 1c, since the camber is not canceled without permission, it is excellent in safety during work.
And since it is not necessary to provide a supporting work when forming concrete slab, the cost required for construction of concrete slab is reduced also in deck plate 1c. Further, since the entire length of the deck plate 1c is variable, it can be recovered from the formed concrete slab and reused.

FIG.5 (c) is the front view of Example 4 of the deck plate based on embodiment of this invention, FIG.5 (d) is the figure which showed the shape typically. In addition, about the component shown in FIG. 1 or FIG. 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
As shown in FIG. 5C and FIG. 5D, the deck plate 1d includes square bars 61, 61 (fixed to the side portions of the two beam molds 60, 60 in the deck plate 1a of the first embodiment. When the flat ends 56b and 57b are respectively placed on the upper surface of FIG. 7A), the whole is formed in a curved state so that the central portion in the longitudinal direction becomes the highest. .

  When the deck plate 1d is bridged between the square members 61 and 61 fixed to the side portions of the two beam molds 60 and 60, a camber is formed. The bolt 3 has a tip that prevents the camber from being removed due to the formwork members 52 and 53 moving freely when concrete is placed on the upper surfaces 54a and 55a of the flat plates 54 and 55. By pressing the lower surface 56c of the square pipe 56 with 3a, it has the function of restricting the movement of the mold members 52 and 53.

  As described above, the deck plate 1d has a variable overall length and does not require installation of a support for supporting the central portion in the longitudinal direction when the concrete slab is constructed. The construction cost is reduced, and the effect is that recovery from the formed concrete slab is easy.

In the deck plates 1a to 1d, the bottom surface 57c of the square pipe 57 and the base 4 are provided with the bolt hole 2 and the bolt hole 4a, respectively, but the deck plate of the present invention is not limited to such a structure.
For example, the bolt hole may be provided in at least one of the lower surface 57 c of the square pipe 57 and the pedestal 4. That is, instead of either the bolt hole 2 or the bolt hole 4a, a structure in which an insertion hole in which an internal thread portion is not formed on the inner peripheral surface may be provided. Further, the side plate of the square pipe 57 can be made thick so that the base 4 is not provided.
In addition, when providing the insertion hole instead of the bolt hole 2 in the lower surface 57c of the square pipe 57, since processing is easier than when the bolt hole 2 is provided, there is an advantage that the manufacturing cost is reduced.

  Further, the deck plates 1c and 1d may have a structure in which the reinforcing plate 5 having a desired width is provided on the side plate of the opening end 57a of the square pipe 57. In this case, the same actions and effects as the deck plate 1b are exhibited in the deck plates 1c and 1d.

  INDUSTRIAL APPLICABILITY The present invention is applicable when a concrete slab is constructed on a floor or a ceiling of a multi-layered building in a structure using reinforced concrete or steel reinforced concrete as a structural material.

  DESCRIPTION OF SYMBOLS 1a-1d ... Deck plate 2 ... Bolt hole 3 ... Bolt 3a ... Tip 4 ... Base 4a ... Bolt hole 5 ... Reinforcement plate 51 ... Deck plate 52, 53 ... Formwork member 54, 55 ... Flat plate 54a, 55a ... Upper surface 54b, 55b ... Lower surface 56, 57 ... Square pipe 56a, 57a ... Open end 56b, 57b ... Flat end 56c, 57c ... Lower surface 58 ... Slab 59 ... Supporting work 60 ... Beam formwork 61 ... Square material 62 ... Sleeper 63 ... Beam 64 ... Slab

Claims (6)

A deck plate used as a part of a formwork when forming a concrete slab on the floor or ceiling of a building,
A first rectangular pipe first flat end having a flat portion in the so that crushed into a flat shape over the desired length from the one end of which we provided,
A second square pipe provided with a second flat end having a flat part so as to be flattened from one end over a desired length ;
First flat plate that is joined to the lower surface except where in the desired within the distance from the upper surface is opened port end of the first square pipes,
A second flat plate in which the upper surface of the second square pipe is joined to the lower surface;
A bolt that is screwed into a first bolt hole provided on the lower surface of the second square pipe,
The open end of the first square pipe is formed so as to be able to be inserted into the open end of the second square pipe,
The first flat plate and the second flat plate are:
The first square pipe is joined to the first square pipe and the second square pipe, respectively, so that the first square pipe can be inserted into the second square pipe.
The first bolt hole is
Formed at a location where the lower surface of the first square pipe can be pressed by the tip of the bolt screwed so as to protrude into the second square pipe ;
The first square pipe is bent downward so that the first flat end forms an obtuse angle with the first flat plate,
The deck plate , wherein the second square pipe is bent downward so that the second flat end forms an obtuse angle with the second flat plate. A pedestal having a second bolt hole screwed with the bolt;
2. The deck according to claim 1, wherein the pedestal is provided so that the second bolt hole communicates with the first bolt hole with respect to the lower surface of the second square pipe. plate.   Instead of the first bolt hole, an insertion hole through which the bolt is inserted is provided on the lower surface of the second square pipe so as to communicate with the second bolt hole. The deck plate according to claim 2.   The said 2nd square pipe is formed thicker than the other part over the desired length to the longitudinal direction from the said opening end, The Claim 1 thru | or 3 characterized by the above-mentioned. Deck plate.   The second square pipe is characterized in that a reinforcing plate is joined to the outer surface of three side plates not in contact with the second flat plate over a desired length from the opening end in the longitudinal direction. 4. The deck plate according to 4. 5. The deck plate according to claim 4, wherein the second square pipe has a reinforcing plate bonded to an inner surface of four side plates over a desired length in a longitudinal direction from the opening end.

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