JPH10152990A - Method for vertical placing joint, and embedded sheathing board therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a roughening treatment such as chipping or the like in an additionally placing work. SOLUTION: Embedded sheathing plates in which structures sticking concrete are formed at both faces of the sheathing body, are arranged in a vertical placing joint in the state that reinforcements are forced to pierce the sheathing body, in this vertically placing joint (102-106). Then, concrete is placed in one side of the embedded sheathing and the other side thereof respectively (step 107, 108).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical joint method for reinforced concrete beams, slabs, and the like, and an embedding board used for the method.

[0002]

2. Description of the Related Art A joint portion provided in concrete is liable to cause a deterioration in structural strength and durability due to the joint portion becoming a defective portion. Therefore, when providing a joint in concrete, it is important to increase the integrity of the pre-cast concrete and the post-cast concrete as much as possible so that the joint does not become a weak point. Before casting, the joint surface of precast concrete must be treated to expose sound concrete.

Here, the procedure for providing a vertical joint in a reinforced concrete beam, slab, or the like is as follows.
Attach a dam to the joint, and then pour first-cast concrete. Next, after the curing period has elapsed, the dam is removed, and the exposed surface, that is, the joint surface is roughened by chipping or wire brush to remove the fragile concrete formed on the joint surface. .

[0004] When sound concrete is exposed on the joint surface, water is appropriately absorbed, and then post-cast concrete is cast to integrate the concrete with pre-cast concrete.

[0005]

However, a large number of rebars arranged on the joint surface hinder the roughening treatment, and unlike the horizontal joint surface, hardening of the precast concrete considerably progresses. Therefore, there has been a problem that the roughening processing of the joint surface is very troublesome.

The present invention has been made in view of the above-mentioned circumstances, and provides a vertical joint method that does not require processing such as chipping on a joint surface of precast concrete, and an embedding dam used therefor. Aim.

[0007]

In order to achieve the above object, a vertical joint method according to the present invention comprises embedding a dam having a concrete adhering structure provided on both sides of a dam body. The rebar is penetrated into the vertical joint portion of concrete with the reinforcing bar penetrated through the main body of the weir, and concrete is poured on one side and the other side of the embedding board.

Further, the embedding board of the present invention has a concrete adhering structure provided on both sides of a main body of the damping board formed so that a reinforcing bar can be inserted therein. This is to ensure the strength of adhesion to concrete cast on both sides of the weir board body.

Further, the embedding dam of the present invention is provided in claim 2 of the present invention.
The weir plate main body is composed of a plurality of weir plate pieces, and the reinforcing bar is fitted into a reinforcing groove formed in a joining edge portion of the weir plate piece.

[0010] In the vertical joint method of the present invention and the embedding board used therein, unlike the conventional weir board, the embedding board is left in the concrete without being removed from the mold.
In this way, the concrete cast on both sides of the embedding board is joined and integrated with each other via the body of the board and the concrete adhering structure provided on the board.
Therefore, unlike the conventional joint method, it is not necessary to roughen the joint surface of the previously cast concrete by chipping or a wire brush.

The embedding board can be manufactured, for example, as a precast concrete product. However, the embedding board is buried in the concrete without being removed from the mold and becomes a part of structural members such as beams and floor slabs. The fiber is reinforced as necessary so as to have a strength equal to or higher than that of the structural member, or is made of a material such as steel or fiber reinforced plastic.

[0012] The portion where the vertical joint is provided may be a beam, a floor slab, a wall, or the like. In any case, the present invention is applied to all cases where the joint extends in the vertical direction. In addition, the vertical direction here is not a vertical in a strict sense,
Any joints provided to prevent the horizontal flow of fresh concrete include those having a certain slope.

When the embedding board is attached to the vertical joint portion, it is necessary to penetrate a reinforcing bar such as a beam bar or a slab bar, which is installed in accordance with a part, through the bar body. In the case where the reinforcing bar is constituted by a weir plate and the reinforcing bar is fitted into a reinforcing groove formed at a joint edge of the weir plate, the reinforcing bar is easily overlapped with the reinforcing bar. Mounting becomes possible.

The construction of the concrete adhering structure is optional. For example, the concrete body is made to penetrate through a fixing member such as a penetrating bar, an anchor bolt or the like so as to protrude from both sides of the main body. Forming irregularities such as ribs and grooves,
A structure is conceivable in which the dam body is made of precast concrete and the aggregate of the concrete is exposed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a vertical joint method according to the present invention and an embedding board used for the method are applied to a reinforced concrete beam will be described below with reference to the accompanying drawings.

FIG. 1 is a flowchart showing the procedure of the vertical joint method according to the present embodiment. As can be seen from the figure, in the vertical joint method according to the present embodiment, first,
A beam formwork is installed (Step 101), and then the embedding board of the present embodiment is installed at a predetermined position where a vertical joint is provided (Steps 102 to 106).

FIG. 2 shows an embedding board 1 according to this embodiment.
FIG. As shown in the figure, the embedding dam 1 is composed of a lower dam 2 as a plurality of dams.
a, the main body 2 is composed of the middle step board piece 2b and the upper step board piece 2c, and the anchor bolt 3 as a concrete adhering structure is made to penetrate the middle step board piece 2b and protrude from both sides thereof, The anchor bolts 3 are fixed in concrete cast on both sides of the weir board main body 2 so as to secure an adhesive strength with the concrete.

The lower weir 2a, the middle weir 2b, and the upper weir 2c can be manufactured, for example, as a precast concrete product.
As it is part of the reinforced concrete beam as it is without being removed, it is reinforced with carbon fiber or the like as necessary so that it has the same or higher strength as this beam, or steel or fiber reinforced instead of concrete It is preferable to use a material such as plastic.

Reinforcing grooves 4 and 5 are formed at the joining edges of the lower weir 2a and the middle weir 2b, respectively, and lower braces 9 of the beams are fitted in the grooves. I have. Similarly, reinforcing joint grooves 6 and 7 are formed at the respective joining edges of the middle and upper weir plates 2b and 2c, and the upper strut 10 of the beam is fitted into the grooves. I have.

Ribs 11 are formed on both sides of the middle wedging plate piece 2b, and serve as a concrete adhering structure together with the anchor bolt 3, and are also used as a stiffening structure for increasing the bending rigidity of the middle weeding plate piece 2b. You.

In order to install the embedding dam 1, first, as shown in FIGS. 3A and 3B, the lower dam 2 a is attached to the bottom 20 of the beam form (step 102 in FIG. 1). .

Next, an adhesive is applied to the inside of the reinforcing groove 4 of the lower weir 2a, and the lower line 9 of the beam is fitted into the groove (step 103). The lower muscle 9 is embedded in the embedding plate 1 in a state where the lower muscle 9 is passed through a stirrup (not shown) together with an upper muscle 10 described later.
It is good to attach.

Next, an adhesive is applied to the bonding surface of the lower weir 2a, and the middle weir 2b is bonded thereon as shown in FIGS. 3 (c) and 3 (d). At the time of joining, the middle step board piece 2b
Is positioned so that the lower muscle 9 is fitted into the groove 5 (step 104). The application of the adhesive may be performed simultaneously with the application to the reinforcing groove 4.

Next, as in steps 103 and 104, an adhesive is applied to the reinforcing groove 6 of the middle weir plate piece 2b, and the upper bar 10 of the beam is fitted into the groove (step 105). An adhesive is applied to the joint surface of the plate piece 2b, and the upper weir plate piece 2c is joined thereon (step 106).

Next, as shown in FIG. 4 (a), concrete 21 is pre-cast on one side of the assembled embedding board 1 (step 107), and subsequently, as shown in FIG. 4 (b). The concrete 22 is cast on the opposite side (step 108).

In this way, the concretes 21 and 22 cast on both sides of the embedding board 1 can be separated from the respective board pieces 2.
a, 2b, 2c and the intermediate step board piece 2b are joined and integrated with each other via an anchor bolt 3 provided on the middle step board piece 2b.

As described above, according to the vertical joint method according to the present embodiment and the embedding board used therein, the embedding board 1 is left in the concrete without being removed from the concrete, and the embedding board is removed. The concrete on both sides is integrated via the. Therefore, like the traditional method of connection,
There is no need to roughen the joint surface of the previously cast concrete by chipping or wire brush.

Therefore, the work on site is made more efficient by the amount of troublesome work such as chipping and the like, and conventionally, a series of steps such as curing of preceding concrete, demolding of dams and roughening are performed. Without following the procedure of the following concrete can not be poured, the flow of such a joint process may be critical in the entire process, but according to the vertical joint method of the present embodiment, There is no need to wait for a certain amount of time after the preceding placement is completed before the subsequent placement, and as soon as the preparation for the later placement is ready, the subsequent concrete placement can be performed simultaneously. it can. Therefore, the influence of the joining process on the entire process is almost negligible, which contributes to shortening the entire construction period.

Further, the weir board main body 2 is divided into a plurality of weir board pieces 2.
a, 2b, 2c, and the reinforcing bars 9, 10 of the beams are fitted into the reinforcing grooves 4, 5, 6, 7 formed at the joint edges of the weir plate pieces. Even when spacers and the like are intersected in the frame, or when the stirrups are already arranged, it is difficult to move the embedding board 1 horizontally. , 2b, 2c
The embedding board 1 can be easily mounted by sandwiching it.

Further, the lower struts 9 and the upper struts 10 of the beam are
a, 2b, and 2c are positioned in the reinforcing grooves 4, 5, 6, and 7, so that the reinforcing grooves are accurately formed in accordance with the designed reinforcing arrangement position, so that the rebar pitch and cover thickness can be increased. Can be easily ensured.

Further, the plurality of weir plates 2a, 2b, 2c are joined to each other via an adhesive, and the joined weir board main body 2 is fixed to the reinforcing bars 9, 10 also via the adhesive. Therefore, it is possible to simplify or omit the shoring for supporting the lateral pressure of the concrete.

In this embodiment, an example in which the vertical joint is provided on the beam has been described. However, it goes without saying that the present invention can be applied to a case where the vertical joint is provided on a floor slab, a wall, or the like in addition to the beam.

Further, in the present embodiment, the main body of the weir plate is constituted by a plurality of pieces of the weir plate, but may be an integral structure instead of the divided structure. FIG. 5 is a perspective view showing an embedding board according to such a modification. As can be seen from the figure, the embedding board 31 of this modification is an integrated weir board body 32.
In addition, penetration holes 33 and 34 for penetrating the lower streaks 9 and the upper streaks 10 of the beam are formed in the dam body 32 while the anchor bolts 3 are penetrated to project from both sides of the main body.

Also in this configuration, the concrete poured on both sides is integrated via the embedding plate 31, and the necessity of treating the joint surface of the preceding concrete is eliminated, which is almost the same as the above-described embodiment. Has the effect of

When the integrated embedding board 31 is used, first, for example, the lower streaks 9 and the upper streaks 10 of the beam are inserted into the insertion holes 33 and 34 of the weir board main body 32 on the ground, and then the stirrups are removed. Preferably, the assembly is wound into a rebar assembly, and the assembly is then suspended in the beam formwork.

In this embodiment, the anchor bolts and the ribs are used as the concrete attachment structure. However, any one of them may be omitted as long as the designed adhesion strength can be obtained. In addition, a cutting bar may be used in place of the anchor bolt, or irregularities may be formed on the weir board main body, and the irregularities may have a concrete adhering structure.

FIG. 6 shows an embedding dam 4 according to another modification.
1 is shown. As can be seen from the figure, the embedding board 41 of this modification is similar to the embedding board 1 in that the lower weir 42a, the middle weir 42b, and the upper weir 4
The crevice board body 42 is formed from 2c, but the both surfaces of the middle step board piece 42b are exposed to the aggregate 43 to form a concrete adhesion structure, and the adhesion to concrete is ensured by such an aggregated finish surface. It is supposed to.

In this structure, the concrete cast on both sides is integrated via the embedding plate 41, and the necessity of treating the joint surface of the preceding concrete is eliminated. Has the effect of

Further, in this embodiment, the concrete adhering structure is provided only on the middle weir plate, but if necessary, the lower weir plate and the upper weir plate may be made of concrete made of anchor bolts, scissors, or irregular surfaces. An attachment structure may be provided.

[0040]

As described above, according to the vertical joint method according to the first aspect of the present invention, the embedding board is left in the concrete as it is without being removed from the mold, and the embankment is inserted through the embedding board. Since the concrete on both sides is integrated, there is no need to roughen the joint surface of the previously cast concrete by chipping or a wire brush unlike the conventional joint method. For this reason, work on site is made more efficient, and the joining process is not critical to the entire process, which contributes to shortening the overall construction period.

According to the embedding board of the present invention according to the second aspect, since it is not removed from the mold and remains in the concrete as it is, and the concrete on both sides is integrated, the joint surface of the previously cast concrete is installed. Does not need to be roughened by chipping or the like. For this reason, work on site is made more efficient, and the joining process is not critical to the entire process, which contributes to shortening the overall construction period.

According to the embedding board according to the third aspect of the present invention, since the spacers and the like are intersected in the formwork, or the shear reinforcing bars are already arranged, the embedding board is horizontal. Even if the movement is difficult, it can be easily mounted in the mold.

[0043]

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure of a vertical joint method according to an embodiment.

FIG. 2 is an exploded perspective view showing an embedding board according to the embodiment.

FIGS. 3A and 3B are views showing a state in which a series of operations are performed according to the vertical joint method according to the embodiment, wherein FIG. 3A is a cross-sectional view when a lower streak is arranged, and FIG. ) Is a cross-sectional view along the line AA, (c) is a cross-sectional view when the upper streak is arranged, and (d) is (c).
Sectional drawing which follows the BB line of FIG.

FIG. 4 is a diagram showing a series of operations, and FIG.
2 is a cross-sectional view when concrete is cast on one side of the embedding board, and (b) is a cross-sectional view when concrete is poured on the other side.

FIG. 5 is an overall perspective view showing an embedding board according to a modification.

FIG. 6 is an exploded perspective view showing an embedding board according to another modification.

[Explanation of symbols]

1, 31, 41 Embedment board 2, 32, 42 Body of main board 2a Lower board piece (slit board piece) 2b Middle board piece (slit board piece) 2c Upper board piece (slit board piece) 3 Anchor bolt ( Concrete attachment structure) 4, 5, 6, 7 Reinforcement groove 9, 10 Reinforcing bar 11 Rib (Concrete attachment structure) 21, 22 Concrete 42a Lower crest plate piece (circular plate piece) 42b Middle crevice plate piece (circular plate piece) 42c Upper-stage crevice board piece (cough board piece)

Claims (3)

[Claims] 1. An embankment board having a concrete adhering structure provided on both sides of a dam body, and a reinforcing bar penetrating through the dam body, and disposed on a vertical joint of concrete.
A vertical joining method, wherein concrete is cast on one side and the other side of the embedding board. 2. A concrete adhering structure is provided on both sides of a main body of a baffle formed so that a reinforcing bar can be inserted therein, and the concrete adhering structure has a lower adhering strength with concrete cast on both sides of the main body of the weir. Embedded embankment characterized by being secured. 3. The embedding device according to claim 2, wherein said weir plate main body is composed of a plurality of weir plate members, and said reinforcing bar is fitted into a reinforcing groove formed in a joint edge portion of said weir plate member. Cough board.