JP3102557U - Joint material for precast PC board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint material for sealing between precast PC boards constituting a floor slab, a wall, etc. of a structure, which has an extremely excellent sealing property and has a very low possibility of falling off after construction. I do.
SOLUTION: The joint material 1 for a precast PC board of the present invention seals between structural precast PC boards 7 on which concrete is poured on the upper surface side, and is provided between adjacent precast PC boards 7 vertically. A joint material main body 2 having a substantially rectangular cross section interposed between the end faces 71, and protruding from one edge of the upper surface 21 of the joint material main body 2 and being bent toward one of the precast PC plates 7 side. It is made of an elastic body having a collapsible flange 3 joined to the horizontal plane 72 of FIG.
[Selection diagram] Fig. 1

Description

  The present invention relates to a joint material used to seal a space between adjacent precast PC boards when constructing a floor slab (slab) or a wall of a structure by using a precast PC board (precast prestressed concrete board). .

  In recent years, as a bridge such as a road bridge, one having a plurality of precast PC boards spanned between main girders and having a PC composite floor slab obtained by constructing reinforced concrete on the upper surface side thereof has been widely used (see below). Etc.).

FIG. 5 shows an example of construction of a conventional PC composite floor slab.
First, as shown in FIG. 5 (a), a precast PC board (7) manufactured in a factory is transported to a construction site, and a sponge or the like is attached to one vertical end surface (71) of each precast PC board (7). After temporarily bonding one side surface of a rectangular cross-section backup material (91) made of an elastic body, the backup material (91) is interposed between the vertical end faces (71) of adjacent precast PC boards (7). As shown, the precast PC board (7) is sequentially spanned between main girders (not shown).

  Next, as shown in FIG. 5 (b), a caulking material (92) is applied to the bottom of the groove formed by the notch (70) formed on the upper surface of the end of the adjacent precast PC board (7). After filling, the caulking material (92) is cured for a predetermined time.

  Thereafter, as shown in FIG. 5 (c), a non-shrink mortar (93) is cast on the concave groove above the caulking material (92), and the non-shrink mortar (93) is cured for a predetermined time. As described above, the non-shrink mortar (93) may be directly cast into the groove without filling the caulking material (92).

  Finally, as shown in FIG. 5 (d), after reinforcing the precast PC board (7) and the joints above these joints, concrete (C) is poured and the concrete (C) is left for a predetermined time. Cure. Thus, a PC composite floor slab (9) is obtained.

However, in the case of the above-mentioned PC composite floor slab (9), there are many high places work at the construction site, and the work requires skill, and it takes time to cure the caulking material (92) and the non-shrink mortar (93). , Safety, workability, construction cost, etc. In the case of the above-mentioned PC composite floor slab (9), the adhesion of the backup material (91) to the precast PC board (7) is not sufficient, and the backup material (91) and the non-shrink mortar (93) However, there was a risk that the material would fall off after the construction.
JP-A-2002-356814 (paragraphs 0013 and 0021, FIG. 6, etc.)

  The purpose of the present invention is to solve the above-mentioned problems, as a joint material for sealing between precast PC plates constituting a floor slab or a wall of a structure, as well as having extremely excellent sealing properties, An object of the present invention is to provide a material having a very low possibility of falling off after construction.

  The joint material for precast PC boards according to the present invention is a joint material for sealing between structural precast PC boards in which concrete is cast on one side, and is interposed between end faces of adjacent precast PC boards. A joint material main body having a substantially rectangular cross section, and a predetermined angle with the end face of the precast PC plate protruding from one edge of the concrete casting surface of the joint material body and being bent toward one precast PC plate side. It is characterized by being made of an elastic body integrally provided with a collapsible flange joined to a continuous surface.

In the above joint material, the joint material main body is interposed between the end faces of the adjacent precast PC boards, and the collapsible flange is bent toward one of the precast PC boards to form an end face of the precast PC board. Since the joints are joined at a predetermined angle, the joint body and the collapsible flange can more reliably seal between the precast PC boards. In addition, since one side surface of the collapsible flange is joined to the surface of one precast PC board, the other side surface of the collapsible flange is also adhered to concrete, so that the joint material adheres to the precast PC board. The performance is improved.
Therefore, according to the jointing material of the present invention, the sealing work between the precast PC boards can be easily and reliably performed when the floor slab or the wall is constructed with the precast PC boards. Concrete can be poured directly without intervening caulking material or non-shrink mortar in the part, thereby reducing dangerous on-site work, improving workability, shortening construction period and reducing construction cost . In addition, the joint material of the present invention has an excellent adhesion to the precast PC board, and therefore has a very low possibility of falling off after construction.

  As the material of the elastic body constituting the joint material, rubber, a suitable material may be used from known elastic materials such as synthetic resin, and preferably, EPDM rubber sponge having excellent weather resistance is used. Can be The collapsible flange of the joint material is joined to the surface of one precast PC board by, for example, a double-sided adhesive tape or an adhesive.

  In the joint material for precast PC board according to the present invention, preferably, near the boundary between one side surface of the joint material body contacting the end face of one precast PC board and one side surface of the collapsible flange connected thereto, and concrete of the joint material body. A concave groove for facilitating the bending of the collapsible flange is formed in a width intermediate portion adjacent to the collapsible flange on the receiving surface.

  If the concave groove is formed in the joint material, the collapsible flange can be easily bent, and therefore, the entire collapsible flange can be tilted toward one of the precast PC boards to be easily joined to the surface of the precast PC board. Therefore, the adhesion to the precast PC board and the sealing property are improved accordingly.

  Further, in the joint material for a precast PC board according to the present invention, it is preferable that a ridge extending along the length direction of the joint material is formed on the other side surface of the collapsible flange.

  If the above-mentioned ridges are formed on the other side of the collapsible flange, which becomes the surface for placing concrete when bent, the area of adhesion to concrete increases by that much, and the adhesion to concrete improves. Thus, the joint material is more reliably prevented from falling off after the construction. It is sufficient that at least one ridge is formed, but in order to further improve the adhesion to concrete, a plurality of ridges are formed at intervals in the width direction of the other side surface of the collapsible flange. Is preferred.

  Further, in the joint material for a precast PC board according to the present invention, it is preferable that a ridge extending along the length direction of the joint material is formed on the other side surface of the joint material body in contact with the end surface of the other precast PC board. .

  If the ridges are formed on the other side surface of the joint material main body, the sealing property between the other end surface of the other precast PC board and the other side surface of the joint material main body is further improved. It can be reliably prevented from falling off after curing. It is sufficient that at least one ridge is formed. However, in order to more reliably prevent the concrete slop from falling, a plurality of ridges are formed at intervals in the width direction of the other side surface of the joint material main body. Is preferred.

  Next, an embodiment of the present invention will be described with reference to FIGS. In the following description, “up and down” refers to the upper and lower sides of FIGS. 1 to 4, “front” refers to the left of FIGS. 1, 2 and 4 and the front of FIG. 3, and “rear” Means the right of FIGS. 1, 2 and 4 and the back of FIG.

  1 and 2 show a joint material for a precast PC board according to the present invention. The joint material (1) shown in these figures is made of an EPDM rubber sponge (elastic body) integrally provided with a joint material main body (2) and a collapsible flange (3). The joint material main body (2) has a vertical rectangular cross section, and is interposed between the vertical end faces (71) of the adjacent precast PC boards (7) as described later. The collapsible flange (3) extends upward from the front edge of the upper surface (concrete casting surface) (21) of the joint material body (2), and as described later, the front precast PC board side (7). ), And is joined to a horizontal plane (72) that forms a predetermined angle (= 90 °) with the vertical end face (71) of the precast PC board (7).

  Near the boundary between the front side surface (22) of the joint material body (2) in contact with the vertical end surface (71) of the front precast PC board (7) and the front side surface (31) of the collapsible flange (3), and Recessed grooves (41) and (42) are formed at the width intermediate portions of the upper surface (21) of the joint material main body (2) adjacent to the collapsible flange (3). The concave groove (41) formed near the boundary has a relatively shallow and wide cross-section circular arc shape. In addition, the base end of the rear side surface (32) of the collapsible flange (3) located on the opposite side of the concave groove (41) has a shape that bulges backward in an arc along the concave groove (41). have. The concave groove (42) formed on the upper surface (21) of the joint material main body (2) has a relatively deep and narrow width and a substantially U-shaped cross section. With these concave grooves (41) and (42), the entirety of the collapsible flange (3) can be easily bent forward and at a desired angle.

  In this embodiment, the surface connected to the upper edge of the vertical end surface (71) of the precast PC board (7) is a horizontal plane (72), but depending on the precast PC board, this horizontal plane (72) is an inclined plane. In some cases, it has been done. However, the foldable flange (3) can adjust the bending angle appropriately in the range of about 0 ° to about 90 ° due to the presence of the concave grooves (41) and (42). However, it is possible to surely join.

  On the rear side surface (32) of the collapsible flange (3), which becomes the upper surface (the surface on which concrete is cast) when it is bent, there are three ridges (51) extending along the length direction of the joint material (1). Are formed at equal intervals in the width direction of the rear side surface (32).

  The rear side surface (23) of the joint material body (2) in contact with the vertical end surface (71) of the rear precast PC board (7) has three protrusions extending along the length direction of the joint material (1). The strips (52) are formed at equal intervals in the width direction of the rear side surface (23).

  FIG. 3 and FIG. 4 show steps of constructing a PC (= prestressed concrete) composite slab of a bridge using the joint material (1).

  As shown in FIG. 3 and FIG. 4, the PC composite floor slab (S) is composed of a plurality of precast PC boards (7 ) And reinforced concrete (C) formed above it. The main girder (G) is manufactured at a site or a factory by, for example, a precast segment method or the like.

  At the time of construction, first, the precast PC board (7) manufactured in the factory is transported to the site. As shown in FIG. 3 and FIG. 4, the precast PC board (7) has an inverted trapezoidal notch (70) formed on the upper surface side of both front and rear ends thereof. The lower surface also forms a vertical end surface (71).

  Then, as shown in FIG. 4 (a), a vertical end surface (71) on the rear side of the precast PC board (7) and a horizontal plane (horizontal portion of the cutout (70)) (72) connected to the upper edge thereof are formed. The front side surface (22) of the joint material body (2) in the joint material (1) and the front surface (31) of the collapsible flange (3) bent forward by about 90 ° are attached to a double-sided adhesive tape (not shown). Paste by This attaching work is usually performed not on the main girder (81) but on the ground.

  Next, the precast PC board (7) with the joint material (1) is transported onto the main girder (G) using a crane or the like, and as shown in FIG. It is passed over in sequence.

  Then, as shown in FIG. 4 (b), the joint material main body of the joint material (1) joined to the rear end of the front precast PC board (7) already bridged between the main girders (G). (2), between the vertical end face (71) of the precast PC board (7) and the vertical end face (71) of the rear precast PC board (7) to be next hung, both precast PC boards ( It is interposed in a state compressed in the front-rear direction by 7). Thus, the space between the adjacent precast PC boards (7) is sealed by the joint material (1).

  Then, as shown in FIG. 4 (c), after reinforcing the precast PC board (7) and the joint material (1) with reinforcing bars, the concrete (C) is cast and cured for a predetermined time, whereby the PC is synthesized. Construction of the floor slab (S) is completed.

  As described above, when the jointing material (1) according to the present invention is used, the sealing work between the precast PC boards (7) can be performed easily and reliably, and the jointing between the precast PC boards (7) as in the prior art can be performed. Concrete (C) can be poured directly above the jointing material (1) without interposing any material or non-shrink mortar. Therefore, if the PC composite floor slab (S) is constructed using the above joint material (1), work at heights with danger is reduced, workability is dramatically improved, and shortening of construction period and reduction of construction cost are achieved. Can be planned.

  It should be noted that the above embodiments are merely examples, and it is of course possible to implement the present invention after making appropriate changes without departing from the gist of the present invention described in the claims for utility model registration. is there.

1 is a perspective view of a joint material for a precast PC board, showing an embodiment of the present invention. FIG. 2 is a cross-sectional view of the joint material along the line II-II in FIG. 1. It is a perspective view which shows one of the processes of constructing the PC composite floor slab of a bridge using the joint material of FIG. It is a principal part expanded sectional view which shows the process of constructing the PC composite slab of a bridge sequentially using the joint material of FIG. It is a principal part expanded sectional view which shows the construction method of the conventional PC composite floor slab of a bridge in process order.

Explanation of reference numerals

(1): Joint material for precast PC board
(2): Joint material body
(21): Top surface (concrete casting surface)
(22): Front side (one side)
(23): Rear side (other side)
(3): Foldable flange
(31): Front side (one side)
(32): Rear side (other side)
(41): Groove
(42): Groove
(51): ridge
(52): ridge
(7): Precast PC board
(71): Vertical end face
(72): Horizontal plane
(S): PC composite floor slab

Claims (4)

A joint material (1) for sealing between structural precast PC boards (7) in which concrete is cast on one side,
One of a joint body (2) having a substantially rectangular cross section interposed between end faces (71) of adjacent precast PC boards (7) and one of a concrete receiving surface (21) on the joint body (2). A collapsible flange that projects from the edge of the precast PC board (7) and is bent toward the one precast PC board (7) and joined to a face (72) that forms a predetermined angle with the end face (71) of the precast PC board (7). (3) A joint material for a precast PC board, which is made of an elastic body integrally provided with (3).   Near the boundary between one side surface (22) of the joint material body (2) in contact with the end surface (71) of one precast PC board (7) and one side surface (31) of the collapsible flange (3), and the joint A groove (41) (42) at the middle of the width of the concrete body placement surface (21) of the main body (2) adjacent to the collapsible flange (3) for facilitating bending of the collapsible flange (3). ) Is formed, respectively, The joint material for precast PC boards according to claim 1 characterized by things.   The ridge (51) extending along the length direction of the joint material (1) is formed on the other side surface (32) of the collapsible flange (3). Joint material for precast PC board.   On the other side surface (23) of the joint material main body (2) in contact with the end surface (71) of the other precast PC board (7), a ridge (52) extending along the length direction of the joint material (1) is formed. The joint material for a precast PC board according to any one of claims 1 to 3, characterized in that:

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