JP2019015061A - Concrete floor slab joint structure, concrete floor slab joining method, and concrete floor slab manufacturing method - Google Patents

Abstract

To improve strength both before and after joining while allowing for easy positioning during joining.SOLUTION: A concrete floor slab joint structure 1 in which a first end face 11 of a first concrete floor slab 10 and a second end face 21 of a second concrete floor slab 20 are joined, comprises: a protrusion 12 provided on the first end face 11 of the first concrete floor slab 10 and a recess 22 provided on the second end face 21 of the second concrete floor slab 20. The protrusion 12 and recess 22 are fitted with each other, thus the first end face 11 of the first concrete floor slab 10 and the second end face 21 of the second concrete floor slab 20 can be easily aligned, and positioning facilitated during joining. Further, as the protrusion 12 and the recess 22 are formed of a fiber reinforcement concrete 93, the strength of the protrusion 12 and the recess 22 both before and after joining can be improved. Therefore, it is possible to improve the strength both before and after joining while facilitating positioning during joining.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete floor slab joining structure, a concrete floor slab joining method, and a concrete floor slab manufacturing method.

  Techniques have been proposed for joining the end surfaces of concrete slabs when they are installed on a bridge or the like. For example, in Patent Document 1, the end surfaces of the concrete floor slabs are fitted to each other by fitting a convex portion provided on the end surface of one concrete floor slab with a concave portion provided on the end surface of the other concrete floor slab. A technique for joining the two is disclosed.

JP 2016-98490 A

  By the way, when installing concrete floor slabs on bridges, etc. with a crane, etc., the end surfaces of concrete floor slabs may collide with each other. Improvement is desired.

  Therefore, the present invention provides a concrete floor slab joining structure, a concrete floor slab joining method, and a concrete floor slab manufacturing method capable of improving the strength before and after joining while facilitating positioning during joining. The purpose is to do.

  The present invention is a joint structure of a concrete floor slab in which a first end face of a first concrete floor slab and a second end face of a second concrete floor slab are joined, and is provided on the first end face of the first concrete floor slab. A concrete floor provided with a convex portion formed of fiber-reinforced concrete and a concave portion provided on the second end surface of the second concrete floor slab and formed of fiber-reinforced concrete, the convex portion and the concave portion being fitted to each other It is a joining structure of plates.

  According to this configuration, in the joint structure of the concrete floor slab in which the first end face of the first concrete floor slab and the second end face of the second concrete floor slab are joined, the first concrete floor slab is provided on the first end face of the first concrete floor slab. And a concave portion provided on the second end surface of the second concrete floor slab, and since the convex portion and the concave portion are fitted to each other, the first end surface of the first concrete floor slab and the second concrete floor It is easy to match the second end face of the plate, and positioning when joining is easy. Moreover, since the convex portion and the concave portion are formed of fiber reinforced concrete, the strength of the convex portion and the concave portion before and after joining can be improved. Therefore, the strength before and after joining can be improved while facilitating positioning at the time of joining.

  In this case, the length protruding in the vertical direction from the first end face of the convex portion is shorter than the thickness of the first concrete floor slab, and the length recessed in the vertical direction from the second end face of the concave portion is the thickness of the second concrete floor slab. It is preferable that the length is shorter.

  According to this configuration, the length protruding in the vertical direction from the first end surface of the convex portion is shorter than the thickness of the first concrete floor slab, and the length recessed in the vertical direction from the second end surface of the concave portion is the second concrete floor. Since it is shorter than the thickness of the plate, it is easy to ensure the strength of the convex portion and the concave portion.

  Moreover, the range of the thickness direction of the 1st concrete floor slab from which the convex part protrudes in a 1st end surface is 20%-80% of the thickness of a 1st concrete floor slab, and the recessed part has become depressed in a 2nd end surface. The range in the thickness direction of the second concrete slab is preferably 20% to 80% of the thickness of the second concrete slab.

  According to this structure, the range of the thickness direction of the first concrete floor slab in which the convex portion protrudes at the first end face is 20% to 80% of the thickness of the first concrete floor slab, and the concave portion at the second end face. Since the range in the thickness direction of the second concrete floor slab with the depression is 20% to 80% of the thickness of the second concrete floor slab, positioning during joining becomes easier, and before and after joining The strength can be further improved.

  Moreover, it is preferable that the convex part has a truncated pyramid shape.

  According to this configuration, since the convex portion has a truncated pyramid shape, it is easy to ensure the strength of the convex portion and the concave portion, and it is easy to manufacture the convex portion and the concave portion.

  The first end surface is a first embedded formwork that is used for placing the concrete of the first concrete floor slab, includes a convex portion, and is formed of fiber-reinforced concrete, and the second end surface is the second concrete floor. It is preferably a second embedded form that is used for placing concrete in a plate, includes a recess, and is formed of fiber-reinforced concrete.

  According to this configuration, the first end face is a first embedded formwork that is used for placing the concrete of the first concrete floor slab, includes a convex portion, and is formed of fiber-reinforced concrete, and the second end face is It is the 2nd embedding formwork used for placement of concrete of the 2nd concrete floor slab, including a crevice and formed with fiber reinforced concrete. For this reason, manufacture of a 1st concrete floor slab and a 2nd concrete floor slab becomes easy.

  In this case, one of the first embedded mold and the second embedded mold is manufactured by placing fiber reinforced concrete with the other of the first embedded mold and the second embedded mold as the mold. It is suitable.

  According to this configuration, either one of the first embedded mold and the second embedded mold forms the fiber reinforced concrete with the other of the first embedded mold and the second embedded mold as the mold. Since it is manufactured by this, the precision with which a convex part and a recessed part mutually fit can be improved.

  Moreover, in the state which the convex part of the 1st embedding formwork and the recessed part of the 2nd embedding formwork were mutually fitted, the placement of the concrete of the 1st concrete floor slab using the 1st embedding formwork as an embedding formwork The concrete may be placed on the second concrete floor slab using the second embedded formwork as the embedded formwork.

  According to this configuration, the first concrete floor slab is used as the embedded mold in a state where the convex portion of the first embedded mold and the concave portion of the second embedded mold are fitted to each other. Since the concrete is cast and the concrete of the second concrete floor slab is cast using the second embedded formwork as the embedded formwork, the accuracy of fitting the convex part and the concave part to each other is improved. be able to.

The fiber reinforced concrete preferably has a compressive strength of 100 to 400 N / mm ² on the 28th day of material age.

According to this configuration, since the fiber reinforced concrete has a compressive strength of 100 to 400 N / mm ² on the material age 28th, the strength before and after joining the convex portion and the concave portion can be appropriately improved.

  On the other hand, the present invention is a method for joining a concrete floor slab that joins a first end face of a first concrete floor slab and a second end face of a second concrete floor slab, and is provided on the first end face of the first concrete floor slab. The first concrete floor slab of the first concrete floor slab is fitted by fitting the convex part formed of fiber reinforced concrete and the concave part formed on the second end surface of the second concrete floor slab and formed of fiber reinforced concrete. This is a method for joining concrete floor slabs in which one end face and a second end face of a second concrete floor slab are joined.

  In this case, it is preferable to apply a resin adhesive between the convex portion and the concave portion before the convex portion and the concave portion are fitted to each other.

  According to this configuration, since the resin adhesive is applied between the convex portion and the concave portion before the convex portion and the concave portion are fitted to each other, the first end face of the first concrete floor slab is more reliably provided. The second end face of the second concrete floor slab can be joined.

  In addition, the post-tension material extending between the first concrete floor slab and the second concrete floor slab after the convex part and the concave part are fitted to each other. It is preferable to apply prestress to the first concrete floor slab and the second concrete floor slab by inserting the post tension material.

  According to this configuration, after the convex portion and the concave portion are fitted to each other, the first concrete floor slab and the second concrete floor slab extend across the first concrete floor slab and the second concrete floor slab. The post-tension material to be inserted is inserted, and the first end surface of the first concrete floor slab and the second concrete floor are applied to prestress the first concrete floor slab and the second concrete floor slab by the inserted post-tension material. The second end surface of the plate can be bonded with higher strength. In addition, since the post tension material is inserted into the first concrete floor slab and the second concrete floor slab after the convex portion and the concave portion are fitted to each other, It becomes easy to align the positions of the insertion hole, the insertion groove, the sheath tube, etc. with the 2 concrete floor slab.

The fiber reinforced concrete preferably has a compressive strength of 100 to 400 N / mm ² on the 28th day of material age.

  Further, the present invention is to place concrete using a first embedded formwork formed of fiber reinforced concrete as an embedded formwork, including a convex portion on the outer surface opposite to the side on which the concrete is placed. To produce a concrete floor slab that includes a convex portion on the end surface, and includes a concave portion on the outer surface opposite to the side on which the concrete is placed, and the second embedded mold formed of fiber-reinforced concrete is used as an embedded mold This is a concrete floor slab manufacturing method for manufacturing a concrete floor slab that includes a concave portion on its end face by placing concrete into the end surface.

  In this case, the first embedded mold frame and the second embedded mold frame are arranged to face each other while the convex portion and the concave portion are directed in the direction opposite to the facing direction, and the first embedded mold frame and the second embedded mold frame are embedded. It is preferable to produce a concrete slab that includes a convex portion on one end face and a concave portion on the other end face by casting concrete using it as a frame.

  According to this configuration, the first embedded mold frame and the second embedded mold frame are disposed so as to face each other while the convex portion and the concave portion are directed in the direction opposite to the facing direction. In order to produce a concrete floor slab that includes a convex part on one end face and a concave part on the other end face, by placing concrete using as a buried formwork, the convex part and the concave part between a plurality of concrete floor slabs Are fitted together, a concrete floor slab capable of continuously joining a plurality of concrete floor slabs can be efficiently manufactured.

  One of the first embedded mold and the second embedded mold is manufactured by placing fiber reinforced concrete with the other of the first embedded mold and the second embedded mold as the mold. It is preferable that

  In addition, the concrete is cast using the first embedded mold and the second embedded mold as the embedded mold in a state where the convex part of the first embedded mold and the recessed part of the second embedded mold are fitted to each other. By doing so, a concrete floor slab including a convex part on the end face may be manufactured, and a concrete floor slab including a concave part on the end face may be manufactured.

The fiber reinforced concrete preferably has a compressive strength of 100 to 400 N / mm ² on the 28th day of material age.

  According to the concrete floor slab joining structure, concrete floor slab joining method, and concrete floor slab manufacturing method of the present invention, the strength before joining and after joining can be improved while facilitating positioning during joining. .

(A) is a longitudinal cross-sectional view which shows the joining structure of the concrete floor slab of embodiment, (B) is a front view which shows the convex part of a 1st concrete floor slab. FIG. 2 is a transverse sectional view taken along the line α in FIG. (A) is a longitudinal cross-sectional view which shows the state by which the fiber reinforced concrete of the 1st embedding formwork of a 1st concrete floor slab is laid, (B) is the 2nd embedding formwork of a 2nd concrete floor slab. It is a longitudinal cross-sectional view which shows the state by which the fiber reinforced concrete is laid. By placing concrete using the first embedded formwork and the second embedded formwork as an embedded formwork, a concrete floor slab having one end surface having a convex portion and the other end surface having a concave portion is manufactured. It is a longitudinal cross-sectional view which shows the state which exists. Placing concrete using the first embedded mold and the second embedded mold as the embedded mold in a state where the convex part of the first embedded mold and the recessed part of the second embedded mold are fitted to each other. It is a longitudinal cross-sectional view which shows the state by which the 1st concrete floor slab which contains a convex part is manufactured by the end surface, and the 2nd concrete floor slab which contains a recessed part is manufactured by an end surface.

  Hereinafter, a concrete floor slab joining structure, a concrete floor slab joining method, and a concrete floor slab manufacturing method according to the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 (A) and 1 (B), in the concrete floor slab joining structure 1 of the present embodiment, the first end surface 11 of the first concrete floor slab 10 and the second end of the second concrete floor slab 20 are used. The end surface 21 is joined. The joint structure 1 is provided on the first end surface 11 of the first concrete floor slab 10 and is provided on the convex portion 12 formed of fiber reinforced concrete and the second end surface 21 of the second concrete floor slab 20, and is provided with fiber reinforced concrete. And a recess 22 formed by The convex portion 12 and the concave portion 22 are fitted to each other.

  The convex portion 12 has a quadrangular frustum shape, and the concave portion 22 has a shape corresponding to the convex portion 12 having a quadrangular pyramid shape. The length d protruding in the vertical direction from the first end surface 11 of the convex portion 12 is shorter than the thickness t of the first concrete floor slab 10, and the length d recessed in the vertical direction from the second end surface 21 of the concave portion 22 is the first. 2 It is shorter than the thickness t of the concrete slab 20. Moreover, the range w of the thickness direction of the 1st concrete floor slab 10 in which the convex part 12 protrudes in the 1st end surface 11 is 20%-80% of the thickness t of the 1st concrete floor slab 10, 2nd end surface 21, the range w in the thickness direction of the second concrete floor slab 20 in which the concave portion 22 is depressed is 20% to 80% of the thickness t of the second concrete floor slab 20. Further, as shown in FIG. 2, the total value of the range in the width direction of the first concrete floor slab 10 in which each of the convex portions 12 protrudes from the first end surface 11 is the value of the first end surface 11 of the first concrete floor slab 10. The total value of the range in the width direction of the second concrete floor slab 20 that is 20% to 80% of the width and each of the recesses 22 is recessed in the second end surface 21 is the value of the second end surface 21 of the second concrete floor slab 20. 20% to 80% of the width.

  For example, when the thickness t of the first concrete floor slab 10 and the second concrete floor slab 20 is 240 [mm], the dimensions of the convex part 12 and the concave part 22 are perpendicular to the first end surface 11 of the convex part 12. The length d protruding in the vertical direction and the length d recessed from the second end face 21 of the recess 22 in the vertical direction are 30 to 50 [mm].

  Moreover, when the thickness t of the 1st concrete floor slab 10 and the 2nd concrete floor slab 20 is 240 [mm], the thickness of the 1st concrete floor slab 10 in which the convex part 12 protrudes in the 1st end surface 11 is. The range w in the direction of thickness and the range w in the thickness direction of the second concrete floor slab 20 in which the recess 22 is depressed in the second end face 21 are 150 [mm].

  Moreover, the range of the width direction of the 1st concrete floor slab 10 in which the convex part 12 protrudes in the 1st end surface 11 and the range of the width direction of the 2nd concrete floor slab 20 in which the recessed part 22 is depressed in the 2nd end surface 21 are 400. [Mm]. The intervals between the convex portions 12 in the width direction of the first concrete floor slab 10 and the intervals between the concave portions 22 in the width direction of the second concrete floor slab 20 are 300 [mm]. As shown in FIGS. 1B and 2, a sheath tube 14 into which a post tension material 31 to be described later is inserted is provided between the convex portions 12, and the post tension material is interposed between the concave portions 22. A sheath tube 24 into which 31 is inserted is provided.

The first end face 11 is a first embedded form 13 that is used for placing concrete of the first concrete floor slab 10, includes a convex portion 12, and is formed of fiber-reinforced concrete. The second end face 21 is a second embedded form 23 that is used for placing the concrete of the second concrete floor slab 20, includes a recess 22, and is formed of fiber-reinforced concrete. In the fiber reinforced concrete, reinforcing fibers such as synthetic fibers and steel fibers cut into several [mm] to several [cm] are mixed in the concrete. The fiber reinforced concrete of this embodiment has a compressive strength of 100 to 400 N / mm ² on the 28th day of material age.

  Hereinafter, the joining method of the concrete floor slab of this embodiment is demonstrated. As shown in FIG. 1 (A) and FIG. 2, a method for joining concrete floor slabs that joins the first end surface 11 of the first concrete floor slab 10 and the second end surface 21 of the second concrete floor slab 20 of the present embodiment. Then, it is provided on the first end surface 11 of the first concrete floor slab 10 and is formed on the second end surface 21 of the second concrete floor slab 20 and formed on the second end surface 21 of the fiber reinforced concrete, and is formed on the fiber reinforced concrete. By fitting the recessed portions 22 to each other, the first end surface 11 of the first concrete floor slab 10 and the second end surface 21 of the second concrete floor slab 20 are joined. Before the convex portion 12 and the concave portion 22 are fitted together, a resin adhesive 40 such as an epoxy resin resin is applied between the convex portion 12 and the concave portion 22.

  In addition, after the convex portion 12 and the concave portion 22 are fitted to each other, the first concrete floor slab 10 and the second concrete floor slab 20 are spanned between the first concrete floor slab 10 and the second concrete floor slab 20. A post tension material 31 made of an extended steel wire or steel rod is inserted, and the inserted post tension material 31 applies prestress to the first concrete floor slab 10 and the second concrete floor slab 20. The end portion of the post tension material 31 is fixed by a fixing tool 35 such as a nut-type grip while being tensioned by a jack.

Hereinafter, a method for producing a concrete slab will be described. First, a method for manufacturing the first embedded mold 13 and the second embedded mold 23 will be described. As shown in FIGS. 3 (A) and 3 (B), one of the first embedded mold 13 and the second embedded mold 23 is either the first embedded mold 13 or the second embedded mold 23. It is manufactured by placing fiber reinforced concrete using the other as a formwork. In the example of FIG. 3A, the first embedded mold 13 is manufactured by placing fiber reinforced concrete 93 using the second embedded mold 23 and the mold 91 as the mold. In the example of FIG. 3B, the second embedded mold 23 is manufactured by placing fiber reinforced concrete 93 using the first embedded mold 13 and the mold 92 as the mold. As described above, in the fiber reinforced concrete 93, reinforcing fibers such as steel fibers cut into several [mm] to several [cm] are mixed in the concrete, and the compressive strength at the material age of 28 days is 100 to 400N. / Mm ² .

  As shown in FIG. 4, in the present embodiment, the first embedded form 13 formed by the fiber reinforced concrete 93 including the convex portion 12 on the outer surface opposite to the side on which the concrete 94 is placed is embedded. The first concrete floor slab 10 and the second concrete floor slab 20 including the convex portions 12 on the first end surface 11 are manufactured by placing the concrete 94 using the frame. Further, in the present embodiment, the concrete 94 is formed by using the second embedded form 23 formed of the fiber reinforced concrete 93 as the embedded form including the recess 22 on the outer surface opposite to the side on which the concrete 94 is placed. The first concrete floor slab 10 and the second concrete floor slab 20 including the recess 22 in the second end surface 21 are manufactured.

  As shown in FIG. 4, in the present embodiment, the first embedded mold 13 and the second embedded mold 23 are opposed to each other while the convex portion 12 and the concave portion 22 are directed in the direction opposite to the facing direction. By placing concrete 94 using the 1 embedded mold 13 and the second embedded mold 23 as embedded molds, one first end surface 11 includes a convex portion 12 and the other second end surface 21 has a concave portion 22. The 1st concrete floor slab 10 and the 2nd concrete floor slab 20 which are concrete floor slabs containing are manufactured.

  As shown in FIG. 5, the first embedded mold 13 and the second embedded mold in a state where the convex portion 12 of the first embedded mold 13 and the concave portion 22 of the second embedded mold 23 are fitted to each other. By placing concrete 94 using the frame 23 as an embedded formwork, the first concrete floor slab 10 and the second concrete floor slab 20 which are concrete floor slabs including the convex portions 12 on the first end face 11 are manufactured. The first concrete floor slab 10 and the second concrete floor slab 20, which are concrete floor slabs including the recess 22 in the second end face 21, may be manufactured. That is, in the manufacturing method shown in FIG. 5, the first concrete floor slab 10 and the second concrete floor slab 20 having the same shape and having the convex portions 12 and the concave portions 22 that can be more accurately fitted to each other are manufactured. Is done.

  In the present embodiment, in the joint structure 1 of the concrete floor slab in which the first end face 11 of the first concrete floor slab 10 and the second end face 21 of the second concrete floor slab 20 are joined, the first concrete floor slab 10 Since the convex part 12 provided in the 1st end surface 11 and the recessed part 22 provided in the 2nd end surface 21 of the 2nd concrete floor slab 20 are provided, and the convex part 12 and the recessed part 22 mutually fit, it is 1st The first end surface 11 of the concrete floor slab 10 and the second end surface 21 of the second concrete floor slab 20 can be easily aligned, and positioning at the time of joining is easy. Moreover, since the convex part 12 and the recessed part 22 are formed from 93 in fiber reinforced concrete, the intensity | strength of the convex part 12 and the recessed part 22 before joining and after joining can be improved. Therefore, the strength before and after joining can be improved while facilitating positioning at the time of joining.

  According to this embodiment, since positioning at the time of joining becomes easy, construction time can be shortened. Moreover, since the convex part 12 and the recessed part 22 are formed in the fiber reinforced concrete from 93, the corners of the first end face 11 of the first concrete floor slab 10 and the second end face 21 of the second concrete floor slab 20 are missing. Can be prevented. Moreover, according to this embodiment, both the construction precision and productivity of the 1st concrete floor slab 10 and the 2nd concrete floor slab 20 which are precast floor slabs can be improved.

  In addition, according to the present embodiment, the length d protruding in the vertical direction from the first end surface 11 of the convex portion 12 is shorter than the thickness t of the first concrete floor slab 10 and is perpendicular to the second end surface 21 of the concave portion 22. Since the length d recessed in the direction is shorter than the thickness t of the second concrete floor slab 20, the strength of the convex portions 12 and the concave portions 22 is easily secured.

  Moreover, according to this embodiment, the range w of the thickness direction of the 1st concrete floor slab 10 in which the convex part 12 protrudes in the 1st end surface 11 is 20%-80% of the thickness t of the 1st concrete floor slab 10 Since the range in the thickness direction of the second concrete floor slab 20 in which the concave portion 22 is depressed in the second end face 21 is 20% to 80% of the thickness t of the second concrete floor slab 20, joining is performed. Positioning at the time becomes easier, and the strength before and after joining can be further improved.

  Moreover, according to this embodiment, since the convex part 12 has a truncated pyramid shape, the intensity | strength of the convex part 12 and the recessed part 22 is easy to ensure, and manufacture of the convex part 12 and the recessed part 22 is also easy.

  Further, according to the present embodiment, the first end surface 11 is used for placing the concrete 94 of the first concrete floor slab 10, includes the convex portion 12, and is formed by the fiber reinforced concrete 93. The second end face 21 is a second embedded form 23 that is used for placing the concrete 94 of the second concrete floor slab 20, includes the recess 22, and is formed of the fiber reinforced concrete 93. For this reason, manufacture of the 1st concrete floor slab 10 and the 2nd concrete floor slab 20 becomes easy.

  In addition, according to the present embodiment, one of the first embedded mold 13 and the second embedded mold 23 is a fiber using either the first embedded mold 13 or the second embedded mold 23 as the mold. Since it is manufactured by placing the reinforced concrete 93, the precision with which the convex part 12 and the recessed part 22 fit each other can be improved.

  In the present embodiment, the first embedded mold 13 is used as the embedded mold in a state in which the convex portion 12 of the first embedded mold 13 and the concave 22 of the second embedded mold 23 are fitted to each other. When the concrete 94 of the first concrete floor slab 10 is placed and the concrete 94 of the second concrete floor slab 20 is placed using the second embedded form 23 as an embedded form, The precision with which the part 12 and the recessed part 22 fit each other can be improved.

  Further, according to the present embodiment, the first embedded mold 13 and the second embedded mold 23 are arranged to face each other while the convex portion 12 and the concave portion 22 are directed in the direction opposite to the facing direction. By placing the concrete 94 using the frame 13 and the second embedded mold 23 as the embedded mold, the first end surface 11 includes the convex portion 12 and the other second end surface 21 includes the concave portion 22. In order to manufacture the first concrete floor slab 10 and the second concrete floor slab 20 which are floor slabs, a plurality of concrete floor slabs are fitted to each other by fitting the convex portions 12 and the concave portions 22 with each other. A concrete slab that can be continuously joined to each other can be efficiently manufactured.

Moreover, according to this embodiment, since the fiber reinforced concrete 93 has a compressive strength of 100 to 400 N / mm ² on the material age 28 day, the strength before and after the joining of the convex portion 12 and the concave portion 22 is appropriately set. Can be improved.

  Further, according to the present embodiment, the resin adhesive 40 is applied between the convex portion 12 and the concave portion 22 before the convex portion 12 and the concave portion 22 are fitted to each other. The first end surface 11 of the concrete floor slab 10 and the second end surface 21 of the second concrete floor slab 20 can be joined.

  Moreover, according to this embodiment, after making the convex part 12 and the recessed part 22 mutually fit, the 1st concrete floor slab 10 and the 2nd concrete floor slab 20 are attached to the 1st concrete floor slab 10 and the 2nd concrete. In order to insert the post tension material 31 extending over the floor slab 20 and to apply prestress to the first concrete floor slab 10 and the second concrete floor slab 20 by the inserted post tension material 31, The first end face 11 of the first concrete floor slab 10 and the second end face 21 of the second concrete floor slab 20 can be joined with higher strength. In addition, the post tension material 31 is inserted into the first concrete floor slab 10 and the second concrete floor slab 20 after the convex portion 12 and the concave portion 22 are fitted to each other. It becomes easy to align the positions of the insertion hole, the insertion groove, the sheath tube 24 and the like in the first concrete floor slab 10 and the second concrete floor slab 20.

  As mentioned above, although embodiment of this invention was described, this invention is implemented in various forms, without being limited to the said embodiment. For example, in the above embodiment, both the first concrete floor slab 10 and the second concrete floor slab 20 are provided on the first end surface 11, and are provided on the convex portion 12 formed by the fiber reinforced concrete 93 and the second end surface 21. The embodiment including the recess 22 formed of the fiber reinforced concrete 93 has been described. However, for example, the first concrete floor slab 10 is provided on the first end surface 11 and formed with the fiber reinforced concrete 93 and the convex portion 12 formed on the second end surface 21 and formed with the fiber reinforced concrete 93. The second concrete floor slab 20 is provided on the first end surface 11 and is formed on the second end surface 21 and is formed on the second end surface 21 and is formed on the fiber reinforced concrete 93. The convex part 12 and the recessed part 22 may be mutually fitted. That is, the first concrete floor slab 10 includes only the convex portions 12 on both end surfaces of the first end surface 11 and the second end surface 21, and the second concrete floor slab 20 includes both end surfaces of the first end surface 11 and the second end surface 21. Only the recess 22 may be provided.

  The first concrete floor slab 10 is provided on the first end surface 11, and includes a convex portion 12 and a concave portion 22 formed of fiber reinforced concrete 93, and the second concrete floor slab 20 is provided on the second end surface 21. And the concave portion 22 and the convex portion 12 formed by the fiber reinforced concrete 93, and the convex portion 12 and the concave portion 22 of the first end surface 11 and the concave portion 22 and the convex portion 12 of the second end surface 21 are fitted to each other. Also good. That is, even if the first concrete floor slab 10 includes both the convex portion 12 and the concave portion 22 on the first end surface 11, and the second concrete floor slab 20 includes both the concave portion 22 and the convex portion 12 on the second end surface 21. Good.

  DESCRIPTION OF SYMBOLS 1 ... Joining structure, 10 ... 1st concrete floor slab, 11 ... 1st end surface, 12 ... Convex part, 13 ... 1st embedding formwork, 14 ... Sheath pipe | tube, 20 ... 2nd concrete floor slab, 21 ... 2nd end surface , 22 ... concave portion, 23 ... second embedded form, 24 ... sheath tube, 31 ... post tension material, 35 ... fixing tool, 40 ... adhesive, 91, 92 ... formwork, 93 ... fiber reinforced concrete, 94 ... concrete , D ... length, t ... thickness, w ... range.

Claims (17)

A concrete slab joining structure in which the first end face of the first concrete slab and the second end face of the second concrete slab are joined,
A convex portion provided on the first end face of the first concrete floor slab and formed of fiber-reinforced concrete;
A concave portion provided on the second end face of the second concrete floor slab and formed of the fiber-reinforced concrete;
With
The joint structure of a concrete floor slab in which the convex portion and the concave portion are fitted to each other.   The length of the convex portion protruding in the vertical direction from the first end surface is shorter than the thickness of the first concrete floor slab, and the length of the concave portion recessed in the vertical direction from the second end surface is the second concrete floor. The joint structure of concrete floor slabs according to claim 1, which is shorter than the thickness of the plate.   The range in the thickness direction of the first concrete floor slab from which the convex portion protrudes at the first end surface is 20% to 80% of the thickness of the first concrete floor slab, and the concave portion at the second end surface. The joint structure of concrete floor slabs according to claim 1 or 2, wherein a range in a thickness direction of the second concrete floor slab in which the thickness is depressed is 20% to 80% of a thickness of the second concrete floor slab.   The joint structure of concrete floor slabs according to claim 1, wherein the convex portion has a truncated pyramid shape. The first end face is a first embedded formwork that is used for placing the concrete of the first concrete floor slab, includes the convex portion, and is formed of the fiber-reinforced concrete.
The said 2nd end surface is used for casting of the concrete of the said 2nd concrete floor slab, It is the 2nd embedding formwork including the said recessed part and formed of the said fiber reinforced concrete, The any one of Claims 1-4 The joint structure of concrete floor slabs according to item 1.   Either one of the first embedded formwork and the second embedded formwork is formed by placing the fiber reinforced concrete using the other of the first embedded formwork and the second embedded formwork as a formwork. The joint structure of concrete slabs according to claim 5, which is manufactured.   The first concrete floor slab is used by using the first embedded mold as an embedded mold in a state where the convex part of the first embedded mold and the recessed part of the second embedded mold are fitted to each other. The concrete floor slab according to claim 5 or 6, wherein concrete is placed and concrete is placed on the second concrete floor slab using the second embedded formwork as an embedded formwork. Junction structure. The fiber reinforced concrete, the compression strength at wood age 28 is 100~400N / mm ^2, the junction structure of the concrete floor plate as claimed in any one of claims 1 to 7. A method for joining concrete floor slabs for joining a first end face of a first concrete floor slab and a second end face of a second concrete floor slab,
A convex portion provided on the first end surface of the first concrete floor slab and formed by fiber reinforced concrete, and a concave portion provided on the second end surface of the second concrete floor slab and formed by the fiber reinforced concrete. Are joined to each other to join the first end surface of the first concrete floor slab and the second end surface of the second concrete floor slab.   The method for joining concrete slabs according to claim 9, wherein a resin adhesive is applied between the convex portion and the concave portion before the convex portion and the concave portion are fitted to each other.   After the convex portion and the concave portion are fitted to each other, the first concrete floor slab and the second concrete floor slab extend over the first concrete floor slab and the second concrete floor slab. The post-tension material is inserted, and the prestress is applied to the first concrete floor slab and the second concrete floor slab by the inserted post-tension material. Method. The fiber reinforced concrete, the compression strength at wood age 28 is 100~400N / mm ^2, the joining method of the concrete slab according to any one of claims 9-11. A convex portion is formed on the outer surface opposite to the side on which the concrete is placed, and the convex portion is formed on the end surface by placing the concrete using the first embedded form formed of fiber-reinforced concrete as the embedded form. Manufacturing concrete floor slabs including parts,
A concave portion is formed on the outer surface opposite to the side on which the concrete is placed, and the concrete is cast using the second embedded mold formed of fiber-reinforced concrete as the embedded mold, so that the concave portion is formed on the end surface. A method for producing a concrete slab, comprising producing a concrete slab including the same.   The first embedded mold frame and the second embedded mold frame are arranged to face each other while the convex portion and the concave portion are directed in directions opposite to the directions facing each other, and the first embedded mold frame and the second embedded mold frame are disposed. The concrete floor slab according to claim 13, wherein a concrete floor slab including the convex portion on one end surface and the concave portion on the other end surface is produced by casting concrete using the slab as an embedded formwork. Production method.   Either one of the first embedded formwork and the second embedded formwork is formed by placing the fiber reinforced concrete using the other of the first embedded formwork and the second embedded formwork as a formwork. The manufacturing method of the concrete slab of Claim 13 or 14 manufactured.   Using the first embedded mold and the second embedded mold as the embedded mold in a state in which the convex portion of the first embedded mold and the concave of the second embedded mold are fitted to each other. The concrete floor according to any one of claims 13 to 15, wherein a concrete floor slab including the convex portion on the end surface is manufactured by placing concrete and a concrete floor slab including the concave portion on the end surface is manufactured. Plate manufacturing method. The said fiber reinforced concrete is a manufacturing method of the concrete slab of any one of Claims 13-16 whose compressive strength in material age 28th is 100-400 N / mm < ² >.

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