JPH06341179A - Spandrel construction method - Google Patents

Abstract

PURPOSE:To construct a spandrel wall whose outer view or whose durability is more excellent than prior art materials at low cost. CONSTITUTION:After reinforcing bars for a footing beam 2 are placed, a form of the footing beam 22 is mounted so as to cast concrete 32. When casting concrete 32, a part of anchor reinforcing bars 26 is arranged to project upward by way of a form of the concrete 32. After the footing beam 22 is constructed, a spandrel wall formed preliminarily in a different place is erected on the footing beam 22. During this construction, a horizontal level of the top 10A of the spandrel wall 10 is erected, being adjusted with level mortar 20. Anchor reinforcing bars 18 and anchor reinforcing bars 30 are preliminarily buried into this spandrel wall 10. A part of these reinforcing bars is arranged to project upward and sideways. After a form to form the bottom of a floor slab 24 is mounted, floor slab reinforcing bars 28 are placed in the shape of a lattice and a part of the bars is arranged to cross the anchor reinforcing bars 26 and 30, thereby casing concrete 42. As the anchor reinforcing bars 26 are buried in the footing beam 22 and the floor slab 24 during the concrete placement, the floor slab 24 and the footing beam 22 are fixed so that the spandrel wall 10 and the floor slab 24 may be fixed with the anchor bars 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast / concrete waist wall construction method used in steel structures such as offices, factories and warehouses.

[0002]

2. Description of the Related Art In steel-framed buildings such as offices, factories, and warehouses, the waist wall reduces damage when a transport vehicle such as a forklift accidentally touches the building, or when the soil inside the building is washed with water. , It is indispensable for the reason that dirty water does not spill outside and pollute the outside.

Therefore, as shown in FIG. 6, in the waist wall 60 conventionally used in steel-framed buildings such as offices, factories, and warehouses, it is connected to the anchor bars 64 protruding from the underground beam 62, A method of constructing a waist wall fixed to the underground beam 62 has been proposed. At that time, reinforcing bars 66 for each construction site
After arranging the concrete and assembling the concrete formwork, the concrete 68 was placed. As described above, since the waist wall 60 is connected to the anchor streak 64 protruding from the underground beam 62, it is necessary to cast concrete 68 on site, and a precast concrete plate molded in another place in advance is used. It could not be used as a wall.

Further, the waist wall 60 usually has a height of about 30 cm to 1 m and occupies most of the surface area of the outer wall of the steel frame building, which greatly affects the appearance of the building. . On the other hand, when placing concrete 68,
Due to the shape of the waist wall 60, it is difficult to drive and compact concrete, and due to poor compaction, junkers are likely to occur on the surface of the waist wall 60, and shrink cracks are always generated. Therefore, the outer surface of the waist wall 60 is coated with mortar 70 for exterior treatment.

[0005]

However, this mortar coating is a construction that requires skill, and due to the lack of skilled workers, the construction period was delayed. In addition, the mortar 70 also has a drawback that it tends to peel off due to deterioration. Further, the shape of the waist wall 60, which is high in the vertical direction and long in the horizontal direction, requires skill in assembling the formwork.

In view of the above facts, an object of the present invention is to obtain a waist wall construction method capable of constructing a waist wall having a better appearance and durability than ever before at a low cost.

[0007]

A waist wall construction method according to claim 1 is a precast concrete waist wall construction method, wherein the precast concrete waist wall is erected on an underground beam. And a step of fixing the waist wall made of precast concrete and the end of the first floor slab on the underground beam.

According to a second aspect of the present invention, there is provided a waist wall construction method, which further comprises a step of previously installing a fixing means to the end portion of the first floor slab on the precast concrete waist wall.

The waist wall construction method according to claim 3 is characterized in that the fixing means is an anchor muscle.

[0010]

According to the waist wall construction method of the above construction, the waist wall made of precast concrete which is manufactured in advance in a factory or the like is erected on the underground beam. Next, when placing the first floor slab in concrete, the waist wall made of precast concrete and the end of the first floor slab are fixed on the underground beam. As a result, unlike the conventional case, the waist wall made of precast concrete can be used because it is not fixed to the underground beam via the anchor bar.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a waist wall 10 constructed by the waist wall construction method according to the present invention. The waist wall 10 is provided with predetermined horizontal reinforcements 12 and vertical reinforcements 14, and a precast concrete plate 16 manufactured in advance in a factory or the like is used. An anchor muscle 18 is embedded in the top portion 10A of the waist wall 10 and a part thereof projects upward from the top portion 10A. By using the precast concrete plate 16, the quality of the waist wall 10 itself is stable, and it is manufactured in a factory that can maintain a good environment. Since the surface roughness of the concrete surface is better than that of conventional on-site construction, Waist wall 10
There is no need to apply makeup mortar to the outer circumference of the.

The waist wall 10 is erected on the underground beam 22 via a level mortar 20. This underground beam 22
An end portion 24A of the floor slab 24 is placed on the bottom end of the floor slab 24, and the end portion 24A is embedded in the underground beam 22 and the anchor line 26 having the upper end portion bent is embedded in the end portion 24A.
Floor slab muscles 28 are arranged in a grid pattern on the floor slab 24.

Further, the waist wall 10 is connected to the floor slab 24 via the anchor muscles 30. The anchor muscle 30 is bent into a substantially L shape,
The short curved portion 30A of the long curved portion 30A is embedded in the waist wall 10.
B is embedded in the floor slab 24.

Next, a procedure for constructing the waist wall 10 will be described. Build a kind of foundation according to the scale of the building, then
After the reinforcing bars of the underground beam 22 are laid out, the form of the underground beam 22 is assembled and concrete 32 is placed. At the time of placing this concrete 32, part of the anchor bar 26 is made of concrete 3
It is made to project upwards through the mold of No.2. After the construction of the underground beam 22, the waist wall 10 previously molded at another place is attached to the underground beam 22.
Stand upright. At this time, the upper surface of the top portion 10A of the waist wall 10 is erected while adjusting the horizontal level with the level mortar 20.
An anchor muscle 18 and an anchor muscle 30 are embedded in the waist wall 10 in advance, and a part of these protrudes upward and sideways. In addition, when the waist wall 10 is tall, as shown in FIG.
As shown in FIG. 3, one end of the temporary jig 34 is joined to the fixture 44 embedded in the waist wall 10 in advance, and the other end is joined to the floor slab muscle 28 of the floor slab 24. Thereby, the fall of the tall waist wall 10 can be prevented.

As shown in the plan view of FIG. 3, the waist walls 10 which are continuous in the direction perpendicular to the paper surface of FIGS. A backup material 36 having compressibility may be loaded. Further, the sealing material 38 is filled in the gap.
As a result, even if the precast concrete plate 16 shrinks due to heat, it is possible to prevent the occurrence of cracks and the like.

Further, as shown in FIG. 4, a recess 10C is provided at the end 10B of the waist wall 10 and the water blocking plate 39 is provided in a gap formed by abutting the waist walls 10 provided with the recess 10C.
Then, the sealing material 40 is filled. This can reinforce this joint. further,
As shown in FIG. 5, it is also possible to provide an overlap margin on the end portion 10B of the waist wall 10 and join the end portions 10B of the waist wall 10 to each other in a jagged shape.

Next, a mold for molding the bottom of the floor slab 24 is assembled, and then the floor slab reinforcement 28 is laid out in a lattice pattern, a part of which is crossed with the anchor reinforcements 26 and 30, and the concrete 42 To place. At this time, since the anchor bar 26 is embedded in the underground beam 22 and the floor slab 24, the floor slab 24
The underground beam 22 is fixed, and the waist wall 10 and the floor slab 24 are fixed by the anchor ribs 30. Therefore, it is not necessary to connect the waist wall to the anchor streak erected from the underground beam as in the conventional case. Therefore, the precast concrete board 1
The waist wall 10 can be constructed only by standing the 6 upright on the underground beam 22. Since the waist wall 10 surrounds the four circumferences of the floor, a mold around the floor is unnecessary.

By using the precast cocrete board, there is no problem of compaction of the placed concrete, so that the waist wall 10 does not have any junkers or cracks, and the waist wall 10 has an outer peripheral surface. There is no need to apply mortar. Therefore, in the future, deterioration of the mortar will not impair the appearance of the building.

Also, the anchor bar 3 is used as a means for fixing the floor slab 24 to the waist wall 10 made of precast concrete.
Since 0 is buried in advance, no special skill is required for on-site construction. Therefore, the worker may be a general construction worker and can cope with the recent labor shortage.

Next, at the inner four corners of the waist wall 10, not shown H
A column of shaped steel is erected, and a wall or an opening (not shown) is placed on the waist wall 10, and these are fixed to the waist wall 10 by anchor muscles 18. As a result, offices, factories,
It is possible to construct steel-framed buildings such as warehouses.

In this embodiment, the method of burying the anchor ribs 30 in the waist wall 10 in advance is adopted. However, when the floor slab 24 is formed, another joint metal is used to form the waist wall 10 and the floor slab. A method of fixing 24 may be adopted. In addition, as a means for fixing the waist wall 10 and the floor slab 24, anchoring metal fittings such as reinforcing bars and steel plates are bonded by a method such as high strength bolt bonding or welding.

[0022]

As described above, in the waist wall construction method according to the present invention, the waist wall made of precast / concrete is erected on the underground beam, and then the waist wall made of precast / concrete and the first floor are provided. Since the end portion of the floor slab is fixed on the underground beam, it has an excellent effect that a waist wall having a better appearance and durability than before can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a waist wall constructed according to this embodiment.

FIG. 2 is a cross-sectional view of a waist wall constructed according to the present embodiment when it is tall and a temporary jig is required.

FIG. 3 is a plan view showing an example of a method of joining waist walls.

FIG. 4 is a plan view showing an example of a method of joining waist walls.

FIG. 5 is a plan view showing an example of a method of joining waist walls.

FIG. 6 is a cross-sectional view of a waist wall constructed by a conventional example.

[Explanation of symbols]

 10 Waist wall 16 Precast concrete plate 22 Underground beam 24 Floor slab 30 Anchor reinforcement

Claims (3)

[Claims] 1. A method of constructing a precast concrete waist wall, comprising the step of standing the precast concrete waist wall on an underground beam, and the precast concrete
A waist wall construction method comprising: a waist wall made of concrete; and a step of fixing an end portion of a first floor slab on the underground beam. 2. The method of constructing a waist wall according to claim 1, further comprising the step of previously installing a fixing means to the end of the first floor slab on the waist wall made of precast concrete. 3. The waist wall construction method according to claim 2, wherein the fixing means is an anchor muscle.