JP2973415B1 - Precast concrete slab joint structure - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a precast concrete slab which can join floor slabs on site and is excellent in workability. SOLUTION: A steel plate 2 having a plurality of holes is provided on a floor slab main body 1.
Buried. The steel plate end 7 of the steel plate 2 is protruded from the end surface 6 of the floor slab main body 1 to the outside. A hole 8 for joining is formed in the end 7 of the steel plate.
Drilling. Then, the slab main bodies 1 and 1 are juxtaposed, and bolts are inserted into the joining holes 8 and 8 of the steel plate ends 7 and 7 of the adjacent slab main bodies 1 and 1 and fastened and fixed. The joint material 13 is filled between the end faces 6 and 6 of 1 to finish. No welding work is required, and the construction can be performed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a joint structure for precast concrete slabs.

[0002]

SUMMARY OF THE INVENTION As a precast concrete slab used for roads, bridges, etc., a reinforcing steel or PC is used.
The thing which buried steel material is known. Also, JP-A-63
JP-A-4150 discloses a precast concrete plate in which a frame made of a strip-shaped iron plate is embedded in a concrete plate, wherein the frame has a width in the thickness direction of the concrete plate. It has been proposed that an iron-shaped iron plate is connected sequentially on the width surface of the iron plate with its both side edges aligned, and a certain shape is continuously formed over the entire surface of the concrete plate (claims). In a concrete plate, a conventional PC bar is formed of a strip-shaped iron plate having a width in the thickness direction of the PC plate so that the strength of the PC plate against bending is large (see page 1, left column, line 19 to right column, second column). Further, a fastener for attaching a PC board is provided so that welding can be performed on the surface of the strip-shaped iron plate of the frame (third row, left lower column, page 2, page 2). In the construction material disclosed in JP-A-48-62224, a corrugated, zigzag, honeycomb or other deformed plate-like material is used as a core material, and entangled portions are provided on both sides or one side of the core material. (Publication page 1, right column, lines 10-12),
The entangled portion is formed in a mesh shape or provided with a plurality of through holes.

Meanwhile, only by simply laying the slab has expired edges of each slab, the joining deck comrades together, it is necessary to separate bonding member. Alternatively, in the floor slab, it is conceivable to project the buried reinforcing bars to the outside and join the reinforcing bars to each other. However, welding work is required on site, and furthermore, the relatively thin and substantially circular cross-sectional reinforcing bars are welded to each other. Therefore, the operation becomes complicated, and it is difficult to ensure uniform joining strength. Further, Japanese Patent Application Laid-Open No.
In the construction material disclosed in Japanese Patent Publication No. 50, a PC board mounting plate is provided for joining, but a welding machine is required to perform welding work on site, and welding must be performed each time a floor slab is arranged. Therefore, there is a problem that the number of construction steps increases. Furthermore, in the building material disclosed in JP-A-48-62224, by providing a plurality of through holes, the adhesion between the entangled portion and the concrete can be improved, but when the building material is laid, Building materials cannot be integrated as they are.

[0004] Therefore, an object of the present invention is to provide a joint structure of precast concrete slabs in which floor slabs can be joined together on site and excellent in workability.

[0005]

According to a first aspect of the present invention, a steel plate having a plurality of holes is buried vertically in a floor slab body, and
To project an end portion of the Luo steel to the outside from the end face of the slab body
In addition, the upper and lower ends of the steel plate are shifted in the width direction.
A plurality of precast concrete slabs placed in
The floor slab bodies are juxtaposed , and holes are drilled corresponding to the joining holes.
Formed steel plates for joining , and in front of those adjacent slab bodies
With superimposed said joining steel sheet serial steel plate end, before
The fastening hole inserted through the joint hole and the hole of the joint steel plate.
The steel plate ends of adjacent floor slabs are joined to each other, and these steel plate ends are embedded in a filler filled between the end faces of the floor slab body.
It is a thing.

According to the first aspect of the invention, the strength is obtained by the steel plate integrated with the concrete by the hole, and the steel plate ends protruding from the end surface of the floor slab main body are joined to each other to form an adjacent floor. The edition bodies are joined. Ma
Also, align the joining hole at the end of the steel plate with the hole of the joining steel plate ,
A fastener such as a bolt is inserted into these joining holes, and the steel plate end can be joined by the fastener . In addition, the upper and lower
Are the ends of the steel plate shifted to the left and right respectively?
After the installation, dispose the steel plate for joining and work with fasteners.
Business can be easily performed.

Further, with the invention of claim 2, embedded steel plate having a plurality of holes in the slab body up and down, and to project an end portion thereof a steel sheet to the outside from the end face of the slab body, its
A plurality of precast concrete slabs in which the upper and lower steel plate ends are arranged at positions shifted in the width direction are formed, and a joining hole is drilled at the steel plate end protruding to the outside thereof, and the floor slab main bodies are juxtaposed. Then, the upper surface height of one of the steel plate ends and the lower surface height of the other steel plate end of the adjacent floor slab main body are formed substantially the same, and the other steel plate end is formed on the upper surface of the one steel plate end. with superposed parts filling, combined the bonding holes mutually by fasteners inserted through these bonding holes to join the steel plate end cross, filled with the same steel plate end between the end face of the slab body It is buried in wood.

According to the structure of the second aspect, the hole is used to
The strength is obtained by the steel plate integrated with the concrete,
Also, join the ends of the steel plate protruding from the end surface of the floor slab body.
By this, adjacent floor slab bodies are joined. Ma
Also, align the joint holes with each other, and
Etc., and the ends of the steel plate are joined by these fasteners
it can. Furthermore, the deck body is laid side by side slab of the same shape, the steel sheet edge portions of the slab body other hand is superimposed on the steel plate end of the hand deck body, their steel plate ends to the fastener It is possible to finish the joint between adjacent floor slabs by burying the joint with a filler . Further
And the ends of the upper and lower steel plates are shifted left and right respectively.
Is easy to work with fasteners after installation.
Can be done.

[0009] Further, the invention according to claim 3 is the other floor.
The steel plate of the slab main body is separated from the steel plate of one of the floor slab main bodies.
It is buried in the upper part by the thickness .

According to the third aspect of the present invention, the floor slab main body is
When laying slabs of the same shape side by side,
The steel plate end of one floor slab body is superimposed on the steel plate end,
The ends of the steel plates can be joined with a fastener.

[0011] Further, the invention according to claim 4 is characterized in that the other steel is used.
Forming an upwardly-facing step near the edge of the plate to form the other end of the steel plate;
Is arranged approximately half the thickness of the steel sheet.
To, to form a downward step portion in the vicinity of the steel plate end of the hand
The end of the one steel plate is lowered by about half the thickness of the steel plate.
It is arranged well.

According to the structure of the fourth aspect, the floor slab main body is
When laying slabs of the same shape side by side,
The steel plate end of one floor slab body is superimposed on the steel plate end,
The ends of the steel plates can be joined with a fastener.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 4 show a first embodiment of the present invention, in which a floor slab body 1 is made of a concrete plate having a substantially rectangular plane and a substantially constant thickness, and is preferably formed of high-flow concrete or ultra-high-strength concrete. . Reinforcing steel plates 2 and 2 are buried in the upper left and right of the floor slab main body 1, and reinforcing iron plates 2 and 2 are buried in the lower left middle right thereof. The upper and lower steel plates 2, 2, 2, 2, 2 are preferably disposed at substantially equal intervals in the width direction. By embedding the steel plate 2, it is not necessary to use a PC steel material or the like. The steel plate 2 is formed in a strip shape having a substantially constant width, and its longitudinal direction is arranged so as to match the longitudinal direction of the floor slab main body 1. Further, a plurality of holes 3 are formed in the steel plate 2 in the thickness direction, and a plurality of protrusions 4 are formed on the outer surface of the steel plate 2 in the width direction. The mountain shape has a ridge shape that is continuous in a zigzag shape. Also, the ends of the steel plates 2 are
Steel plate ends 7, 7 for joining are provided to protrude from end surfaces 6, 6 on both longitudinal sides of the floor slab main body 1. Also, joining holes 8, 8 are bored side by side in the steel plate end portion 7, and a bolt 9 serving as an insertion member of a fastener is inserted into the joining hole 8, and the bolt 9 is inserted into the inserted bolt 9. The nut 10 of the attachment is screwed. In this example, as shown in FIG. 3, a joining steel plate 11 is used to join the adjacent steel plate ends 7, 7, and the joining steel plate 11 corresponds to the joining hole 8. At least four holes 12 are drilled. In the drawings, 1U is the upper surface of the floor slab main body 1, and 1D is the lower surface of the floor slab main body 1.

Next, a method of laying and joining the floor slab will be described. A plurality of floor slab main bodies 1 are laid in the width direction, and the floor slab main bodies 1 are laid next to the floor slab main body 1 in the longitudinal direction. in this case,
Mutual steel plate ends 7, 7 of floor slab bodies 1, 1 adjacent in the longitudinal direction
7 is laid so as to have a predetermined interval. In addition, the steel plate end 7,
7 may be almost abutted. Next, as shown in FIG.
11 is overlapped, and the hole 12 is aligned with the joining hole 8,
A bolt 9 is inserted into the communicating holes 8 and 12, and a nut 10 is screwed into the inserted bolt 9, thereby fastening and fixing the steel plate end 7 and the steel plate 11 for joining. To join. In this case, the ends 7, 7 of the steel plates 2,
Since the reference numerals 7 are respectively shifted to the left and right, the arrangement of the joining steel plate 11, the insertion of the bolt 9, the screwing work of the nut 10, and the like can be easily performed after the installation. After joining the steel plate ends 7,7, the filler 13 such as mortar or concrete is filled between the end surfaces 6,6 of the adjacent floor slabs 1,1. The steel plate end 7, the bonding steel plate 11, and the fastener are buried.

[0015] In the present embodiment this way, the upper and corresponding to claim 1, the steel plate 2, 2 having a plurality of holes 3 in the floor plate body 1
Buried underneath, and with them the steel plate 2, the second end 7, 7 projecting from the end surface 6 of the slab body 1 to the outside, they vertically
A plurality of precast concrete slabs in which the steel plate ends 7, 7 are displaced in the width direction are formed, and joint holes 8 are formed in the steel plate ends 7 protruding to the outside, and the floor slab main body 1 is formed.
Are arranged side by side , and holes 12 are drilled corresponding to the holes 8 for bonding.
Forming a steel plate 11, together with the superposed joining steel plate 11 to the steel plate end 7,7 thereof adjacent slab body 1,1, a junction
Bolt as a fastener inserted through hole 8 and hole 12 of steel plate 11 for joining
The steel end portions 7 mutual deck body 1,1 adjacent the 9 <br/> bonding, filling these steel ends 7, 7 was filled between the end faces 6 and 6 of the floor plate body 1,1 The steel plate 2 is buried in the material 13, and the strength is obtained by the steel plate 2 integrated with the concrete through the hole 3, and the steel plate ends 7, 7 projecting from the end face 6 of the floor slab main body 1 are joined to each other, Adjacent floor slab bodies 1, 1 can be integrally joined . Also, junction for combining the hole 8 and the hole 12, inserted through the fastener such as a bolt 9 to these bonding holes 8 and the hole 12, the steel plate end 7 by the fastening tool,
7 can be joined, and there is no need to perform welding as in the related art, and the efficiency of the joining operation can be improved. In addition, upper and lower steel
The steel plate ends 7, 7 of the plates 2, 2 are shifted to the left and right, respectively.
Since in the arrangement of joining the steel sheet 11 after installation, tightening
Work with tools can be easily performed .
The steel plate end 7 of the lower steel plate 2 and the steel plate end 7 of the upper steel plate 2 are arranged at shifted positions, and a gap is formed above the joint of the lower steel plate ends 7, 7, so that the lower steel plate The joining work of the ends 7, 7 can be facilitated .

Further, as an effect of the embodiment, since a plurality of convex portions 4 are formed on the outer surface of the steel plate 2 in the width direction thereof, integration with concrete can be achieved .

FIG. 5 shows a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The joining hole 8A of the portion 7 is formed in a long hole shape elongated in the longitudinal direction, and the dimensional error at the time of manufacturing and the dimensional error between the end surfaces 6 and 6 at the time of construction are caused by the long joining hole 8A. It is possible to easily cope with the case where the floor slab main body 1 is laid by widening or narrowing the space between the end surfaces 6 and 6. Also, as shown in FIG.
Is formed in the shape of a long hole elongated in the width direction, the bonding hole 8A is formed.
And the hole 12A makes it possible to adjust the front, rear, left and right. still,
In this case, although not shown, even if the joining hole 8A is formed to be long in the width direction and the hole 12A is formed to be long in the longitudinal direction, the front, rear, left and right can be similarly adjusted.

[0018] Thus, in the present embodiment, corresponding to claim 1, the first embodiment and the same function have the effect, also, in this example, junction hole 8A is a longitudinal direction of the steel sheet 2 Formed in a long slot shape, the gap error between the floor slab main bodies 1 and 1 can be absorbed by the slot-shaped joining holes 8A to easily join the ends 7 and 7 of the steel plates. it can.

FIG. 6 shows a third embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. This floor slab main body 1A has the same configuration as the floor slab main body 1 except that the height position of the steel plate 2 in the thickness direction is different, and the height of the upper surface of the steel plate 2 of the floor slab main body 1 The height position of the lower surface of the steel plate 2 of the floor slab main body 1A is set in accordance with the position. That is, the steel plate 2 of the floor slab main body 1A is embedded above the steel plate 2 of the floor slab main body 1 by the thickness thereof.

After laying the slab main body 1, the slab main body 1A is laid next to the slab main body 1 in the longitudinal direction. And the joining holes 8, 8 are aligned,
Bolts 9 are inserted through these joining holes 8 and 8 and nuts 10 are tightened and fixed. Thereafter, the space between the end faces 6 and 6 is filled with a filler 13 for finishing.

[0021] In this embodiment Thus,請 Motomeko 2 in response to, the steel plate 2 having a plurality of holes 3 in the floor plate body 1, 1A,
Buried 2 up and down, and they steel plate 2, the second ends 7,7
The projecting Then co from the end surface 6 of the slab body 1,1A outside
The upper and lower steel plate ends 7, 7 are shifted in the width direction.
A plurality of precast concrete floor slabs are formed, and a joining hole 8 is formed in a steel plate end 7 protruding outside the floor slabs, floor slab bodies 1 and 1A are juxtaposed. , 1A, the upper surface height of the steel plate end 7 of one floor slab main body 1 and the lower surface height of the steel plate end 7 of the other floor slab main body 1A are substantially the same. 7 and the steel plate end 7 of the other floor slab main body 1A,
The joining holes 8 and 8 are aligned with each other, and these joining holes 8 and 8 are joined together.
The steel plate ends 7, 7 are joined to each other by bolts 9 which are fasteners inserted into the main body, and these steel plate ends 7, 7 are connected to the floor slab main body 1, 1A.
Since those embedded in the filling material 13 filled between the end faces 6,6, the slab body 1, 1 A is laid side by side slab of the same shape, on one of the steel plate end 7 of the floor plate body 1 The steel plate ends 7 of the other floor slab main body 1A are overlapped, and the steel plate ends 7, 7 can be joined by a fastener.
13 can be buried to finish the joints of the adjacent floor slabs 1 and 1A, and to make the lower surfaces 1D and 1D of the floor slabs 1 and 1A flush with each other, making it easy to join the floor slabs on site. it can. Furthermore, the ends 7, 7 of the upper and lower steel plates 2, 2 are
Because they are shifted left and right, joining after laying
Of the steel plate 11 for use, work with fasteners, etc.
Can be.

As described above, according to the present embodiment, claim 3
In response to the above, the steel plate 2 of the other floor slab body 1A is
Since the slabs are buried above the steel plate 2 of the main body 1 by the thickness of the main body 1 , the slabs 1 and 1A are arranged in the same shape.
When it is laid, one end is attached to the steel plate end 7 of the other floor slab main body 1A.
Steel plate ends 7 of the floor slab body 1
The ends 7, 7 can be joined with a fastener.

FIG. 7 shows a fourth embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. In the floor slab main bodies 1 and 1A shown in FIG. 1, one steel plate end 7 is provided with a long hole-shaped joining hole 8A in the longitudinal direction, and the other steel plate end 7 is formed with a long hole in the width direction. A joining hole 8B is formed.

Accordingly, the relative front and rear positions of the floor slab main bodies 1 and 1A can be adjusted by the joining holes 8A, and the relative left and right (width direction) of the floor slab main bodies 1 and 1A can be adjusted by the joining holes 8B.
The position can be adjusted, and according to the second and third aspects, the same operations and effects as those of the above embodiment are obtained.

FIG. 8 shows a fifth embodiment of the present invention, in which the same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. the steel plate end 7 of the other hand, to form an upward step portion 7U in the vicinity of the end face 6, the steel plate end 7 with high placement only substantially half of its thickness, the slab body 1 hand of steel ends 7, end face 6
Forming a downwardly stepped portion 7D in the vicinity of, and 1 only low rather arrangement of the steel plate end 7 has a thickness substantially half the. Further, the steel plate end portion 7 provided with the upward end portion 7U is provided with the long joining hole 8A in the longitudinal direction.

[0026] Therefore, when laid side by side slab body 1 in the longitudinal direction, as shown in FIG. 8, the steel plate end 7 of the hand
Steel end 7 of the other side are superimposed, and inserting bolts 9 to the joining hole 8A, 8, the nut 10 by screwing, it can be joined.

[0027] In the present embodiment this manner, corresponding to claim 2
And has the same effects as the above embodiment, also, the
In the example, corresponding to claim 4, in the vicinity of the other steel plate end 7
And the other steel plate end 7 is formed of a steel plate.
2 and approximately one-half the thickness of
A downward step 7D is formed in the vicinity of the steel plate end portion 7 to
The steel plate end 7 is arranged to be approximately half the thickness of the steel plate 2
It is as hereinbefore, thus providing an upward stepped portion 7U and down stepped portion 7D, i.e. changing the partial height end face 6 side of the steel plate end 7 is bent stepwise, and the end portion 7 bed Plate body 1
By forming the steel plate 2 in parallel with the inside, the construction can be performed using the floor slab body 1 having the same height of the steel plate 2 to be buried, and there is an advantage that the construction can be performed using the same floor slab. .

The present invention is not limited to the above-described embodiment. For example, the number of steel sheets to be buried can be appropriately selected. Further, the number and arrangement of the holes provided in the steel plate can be appropriately selected. Further, the shape and arrangement of the convex portions can be appropriately selected. Further, a bolt may be inserted into the joining hole from below, and furthermore, both screw bolts may be inserted into the joining hole, and nuts may be screwed into both ends of the both screw bolts to fasten and fix the ends of the steel plate. You may do so. Further, in FIG. 8, is provided with an upward stepped portion 7U and down stepped portion 7D, wherein
In Item 2, an upward step 7U or a downward step 7D which is a step corresponding to the thickness of the steel sheet is formed at one steel sheet end, and an upward step 7U or a downward step 7D is formed at the other steel sheet end. May not be provided. In addition, by embedding a steel plate, it is not necessary to use PC steel or the like,
Needless to say, reinforcing bars can be buried if necessary.

[0029]

[Effect of the Invention] The invention of claim 1, buried steel sheet having a plurality of holes in the slab body up and down, and with the ends of their steel to project to the outside from an end face of the slab body, they
Forming a plurality of precast concrete floor slabs in which the upper and lower steel plate ends are displaced in the width direction, drilling holes for joining at the steel plate ends protruding to the outside thereof, and juxtaposing the floor slab main body , A joining steel plate having holes corresponding to the joining holes
Forming a said the steel plate end thereof adjacent slab body
While laminating the joining steel plate, the joining hole and the
Adjacent floor slabs with fasteners inserted through holes in the joining steel plate
The steel plate ends are joined together, and these steel plate ends are embedded in a filler filled between the end faces of the floor slab body, and the floor slabs can be joined together on site, and the workability is excellent. A joint structure for a precast concrete slab can be provided.

Further, with the invention of claim 2, embedded steel plate having a plurality of holes in the slab body up and down, and to project an end portion thereof a steel sheet to the outside from the end face of the slab body, its
A plurality of precast concrete slabs in which the upper and lower steel plate ends are arranged at positions shifted in the width direction are formed, and a joining hole is drilled at the steel plate end protruding to the outside thereof, and the floor slab main bodies are juxtaposed. Then, the upper surface height of one of the steel plate ends and the lower surface height of the other steel plate end of the adjacent floor slab main body are formed substantially the same, and the other steel plate end is formed on the upper surface of the one steel plate end. with superposed parts filling, combined the bonding holes mutually by fasteners inserted through these bonding holes to join the steel plate end cross, filled with the same steel plate end between the end face of the slab body It is buried in a material, and can join floor slabs on site, and can provide a joint structure of precast concrete slabs excellent in workability.

[0031] Further, the invention according to claim 3 is the other floor.
The steel plate of the slab main body is separated from the steel plate of one of the floor slab main bodies.
It is buried in the upper part by the thickness thereof , so that the floor slabs can be joined together on site, and a joint structure of precast concrete slabs excellent in workability can be provided.

Further, the invention according to claim 4 is characterized in that the other steel
Forming an upwardly-facing step near the edge of the plate to form the other end of the steel plate;
Is arranged approximately half the thickness of the steel sheet.
Forming a downward step near one of the steel sheet ends;
The end of the one steel plate is lowered by about half the thickness of the steel plate.
Is obtained by Ku arranged situ can be joined to deck cross, precast concrete slab excellent in workability
It is possible to provide a joint structure.

[Brief description of the drawings]

FIG. 1 is a perspective view of a floor slab showing a first embodiment of the present invention.

FIG. 2 is a front view of the floor slab showing the first embodiment of the present invention.

FIG. 3 is a plan view of a steel sheet and a joining steel sheet according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a joint showing the first embodiment of the present invention.

FIG. 5 is a plan view of a steel sheet and a joining steel sheet according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a joint showing a third embodiment of the present invention.

FIG. 7 is a plan view of a joint showing a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a joint showing a fifth embodiment of the present invention.

[Explanation of symbols]

 1,1A Floor slab body 2 Steel plate3 holes  6 Edge 7 Steel plate edge7U upward step 7D downward step  8, 8A, 8B Joint hole 9 Bolt (Tightening tool)11 Steel plate for joining 12 holes  13 Filler

Claims (4)

(57) [Claims] 1. A steel plate having a plurality of holes in a floor slab body is vertically
Embedded in, and the end of their steel while projecting to the outside from an end face of the slab body, width steel plate ends thereof upper and lower
The precast concrete slab which is arranged at a position shifted in the direction form a plurality, and bored joining hole in the steel plate end portion protruding to the outside, juxtaposed the slab body, said joining holes
Hole to form a joining steel sheets bored in correspondence with, if overlapping the joining steel plate to the steel plate end thereof adjacent slab body
And inserted into the joint hole and the joint steel plate hole.
The end portions of the steel plates of the adjacent floor slabs are joined to each other by the passed fasteners , and these steel plate ends are buried in the filler filled between the end surfaces of the floor slab main body. Precast concrete slab joint structure . 2. A steel plate having a plurality of holes in a floor slab body is vertically moved.
Embedded in, and the end of their steel while projecting to the outside from an end face of the slab body, width steel plate ends thereof upper and lower
A plurality of precast concrete slabs arranged at positions shifted in the direction are formed, bonding holes are drilled at the ends of the steel plates protruding to the outside thereof, the slab main bodies are juxtaposed, and the adjacent slab main bodies are formed. The upper surface height of one steel plate end and the lower surface height of the other steel plate end are formed substantially the same, and the other steel plate end is overlapped with the upper surface of the one steel plate end, and The joining holes are aligned, and the ends of the steel plates are joined to each other by a fastener inserted into the joining holes, and the ends of the steel plates are embedded in a filler filled between the end surfaces of the floor slab body.
Precast concrete slab of the joint structure, characterized in that the. 3. The steel plate of the other floor slab body is connected to one of the
Embedded in the floor slab body above the steel plate by the thickness
3. A precast condenser according to claim 2, wherein:
Cleat floor slab joining structure. 4. An upwardly directed step near the other end of the steel sheet.
And the other steel plate end is divided into approximately two minutes of the thickness of the steel plate.
And one near the end of one of the steel plates.
Forming a downward step near the edge of the one steel plate
Characterized by being arranged to be approximately half the thickness of
Precast concrete over preparative slab bonding structure of claim 2, wherein
Build.