JPH0748910A - Method of constructing precast concrete stairway - Google Patents

Abstract

PURPOSE:To simplify execution of work and reduce a construction period by mounting a precast concrete stairway, to which a finishing material is driven, to a constructed slant slab in such a fashion that the stairway is adeguately lifted and placing grouts into a gap produced when it is installed, thereby curing the concrete. CONSTITUTION:A precast concrete (PC) stairway 3 is prefabricated in a shop or the like and brought to a construction site where tiles 31 are driven to the top while the bottom is formed on a slope corresponding to a slanted slab 1. Then, the slanted slab 1 is constructed of predetermined stairway scale and shape by a conventional construction method. A waterproofing layer 2 is built up on the top of the slanted slab 1 across the board. The PC stairway 3 is installed to the slanted slab 1 in such a fashion that it is appropriately lifted. Grouts 4 are placed and cured in a gap produced when the stairway is installed. This construction makes it possible to eliminate any influence from the weather and hence reduce the construction period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a precast concrete staircase in which a finishing material is driven.

[0002]

2. Description of the Related Art In constructing a large-scale staircase made of steel-framed reinforcing steel or reinforced concrete, especially for outdoor staircases, normally all steps are carried out on site to form as shown in FIG. Is usually done by the following procedure. (1) First, construct an inclined slab a for receiving stair concrete, (2) apply a waterproof layer b entirely on the upper surface of the inclined slab a, and (3) protect mortar c on the waterproof layer b.
(4) After marking on the upper surface of the protective mortar c, make the required bar arrangement, build a floating formwork, and place stair concrete d, (5) the stair concrete When the predetermined strength was developed in d, the floating form was removed from the mold, and (6) After marking on the stair concrete d,
Apply the tile base mortar e and paste the tile f,
(7) Finally, wash the surface to finish.

[0003] In addition, in the case of not requiring waterproofing, there has been considered a method in which mortar is applied to the upper surface of the constructed slanted slab and then precast concrete step stones are arrayed and integrated on the mortar (actual Kaihei 4- 39228, etc.).

[0004]

However, according to these conventional methods, the number of steps is large, the construction period is prolonged, and it is difficult to shorten the construction period. Also, it is greatly affected by the weather, such as being unable to work in the rain. Since the construction period is prolonged and the period of road closure during construction is extended, securing a safety passage is also a problem. If a tile or stone is post-applied as a finishing material, floating or efflorescence is likely to occur. In addition, it is necessary to take measures to prevent slipping on the precast concrete steps. Waterproofing work, rebar / formwork / concrete work, plasterer /
There are many cases such as tile construction, and it is often difficult to secure the process. The cost is high. There are problems such as. The present invention is intended to solve such conventional problems.

[0005]

In order to achieve the above object, the invention of claim 1 is to install a precast concrete stairs in which a finishing material is driven into a slanted slab constructed by appropriately floating it, and create a gap generated by the installation. It is characterized by injecting grout into and hardening it.

[0006] In the invention of claim 2, after constructing the waterproof layer on the constructed slanted slab, the precast concrete stairs in which a finishing material is driven are appropriately floated and installed on the waterproof layer. It is characterized by injecting grout into the resulting gap and curing it.

[0007]

[Operation] Because of the above structure, the precast concrete stairs and the pouring grout with the finishing material are
Achieve the intended purpose by simplifying construction, facilitating work, shortening the construction period, improving quality and safety, and reducing costs.

[0008]

1 to 8 show an embodiment of the present invention relating to a large outdoor staircase. In the figure, 1 is an inclined slab that is constructed on site to receive precast concrete stairs, 2 is a waterproof layer that is entirely provided on the inclined slab, and 3 is a finish that is arranged on the waterproof layer at appropriate intervals. Precast concrete stairs (hereinafter referred to as PC stairs) 4 made by driving a material are grouts injected and cured between the PC stairs and the waterproof layer 2.

The PC stairs 3 are manufactured in a predetermined form in advance at a factory or on-site site and are carried into the site. However, as shown in FIGS. 1 to 3, it is suitable to be placed on a predetermined inclined slab 1. In terms of width, height, slope, number of steps, thickness, etc., the upper surface is formed into a tiled stepped surface with the tiles 31 driven in, and the lower surface is formed into a sloped surface corresponding to the inclined slab 1, and the upper and middle sides of both sides are formed. A notch 32 is provided at each of the lower three places, a level adjusting hardware 33 with a hanging ring is detachably mounted in each of these notches 32, and an angle 34 (FIGS. 2 and 7) is driven into the lower end edge. As shown in FIGS. 4 to 6, the leveling hardware 33 with a hanging ring forms an L-shaped plate 331 corresponding to the notch 32, and at the upper end of the L-shaped plate, the notch 32 moves upward from the notch. A protruding hanging ring 332 is integrally projected, two through holes 333 are bored in the middle part, and one screw hole 334 is provided in the horizontal lower part, and the lock nut 336 is attached to the screw hole. Screw the adjustment bolt 335 of
In the PC stairs 3, a screw cylinder insert 321 is embedded in the middle portion of each of the notches 32 so as to correspond to the two through holes 333.
The bolts 322 inserted into the through holes 333 are screwed into these inserts 321 to be detachably mounted in the notches.

Next, the procedure of on-site construction will be specifically described in order. (1) Construct a sloped slab 1 of the required scale and shape for stairs using the conventional method. That is, in plan view, a plurality of PC stairs 3 are arranged in a horizontal row, and further, a plurality of PC stairs 3 can be similarly arranged in a row through the landing 5 to construct a predetermined design form (FIG. 1). At this time, on the upper surface of the inclined slab 1,
Flat load receivers 11 are formed at various places in correspondence with the level adjusting hardware 33 with suspension rings for allocation of the PC stairs 3 (FIGS. 2, 4, and 6), and the lower end of each PC stair 3 Each of the two anchor bolts 12 for supporting the rods is planted at appropriate positions and set up in an appropriate position (FIG. 2, FIG. 3, FIG. 7, FIG. 8). (2) The waterproof layer 2 is entirely applied on the upper surface of the inclined slab 1 (FIGS. 4, 6, and 7). Also, each of the load receiving portions 11
An iron plate 14 for curing is placed on the upper surface (FIGS. 4 to 6). (3) After marking the layout of the PC stairs 3 on the upper surface of the waterproof layer 2, each PC stair 3 is slung on the suspension ring 332 of the level adjustment hardware 33 with a suspension ring and tilted one after another by a lifting machine. Build on the slab 1 and install them at intervals of about 30 mm from the waterproof layer 2 (Figs. 1 to 6). At this time, the adjusting bolts 335 of the level adjusting hardware 33 with suspension rings are brought into contact with the above-mentioned curing iron plates 14 at their tips to receive the load of the PC stairs 3 and to adjust the adjusting bolts 335 appropriately. Adjust the above interval by screwing it in and then tighten the lock nut 336 to fix it. Also, the inclined slab 1
Each of the two PC stairs bottom end receiving hardwares 35 that receive the bottom end surface of each PC staircase 3 is attached to each (FIG. 2, FIG. 3, FIG. 7, FIG. 8). These PC staircase lower end brackets 35 are provided with a support member 351 having a L-shaped cross section in which the standing piece at the front end is tilted slightly rearward, the standing piece of the supporting member is provided with a screw hole 352, and the screw hole is provided in the screw hole. Adjustment bolt 353 with lock nut 354
Screw through, and make a through hole 355 in the horizontal rear part,
Attached to the anchor bolt 12 by the through hole, nut
Tighten 13 by screwing and fix it to the inclined slab 1. Then, the adjusting bolts 353 are appropriately screwed to bring their tips into contact with the above-mentioned angles 34 of the PC stairs 3, and the lock nuts 354 are tightened and fixed. (4) When all the PC stairs 3 have been installed,
The packing material is embedded in the joint part (joint part) to eliminate the gap, and each mortar 6 is filled around each of the level adjusting hardware 33 with each hanging ring and each PC stair lower end receiving metal 35 to be hardened, and then each PC stair The back side of 3 is filled with grout 4 from above (FIGS. 4, 6, and 7). (5) When the grout 4 has hardened, all the level adjusting hardware 33 with a hanging ring, the curing iron plate 14 and the PC staircase lower end hardware 35 are removed, the protruding end of the anchor bolt 12 is melted, and the bolt of the waterproof layer 2 is removed. After waterproofing the penetrating parts, etc., place the scaffolding cinder concrete on all the notches 32 and the sloped slabs 1 in the landing 5 to harden it, and then apply the tile base mortar on it. Stick tiles. (6) Remove the packing material embedded in the joint (joint) and apply the required waterproof caulking. The above description is for a large scale, but of course, it can be similarly applied to a small scale, and it may be a case where only one PC stair 3 is used.

In the above-mentioned embodiment, the outdoor stairs that require waterproofing have been described, but if the indoor stairs and the like do not require waterproofing, other than the point that the construction relating to the waterproof layer 2 is omitted, other steps are required. Are the same.

[0012]

According to the present invention, the following effects can be obtained. Bring in the precast concrete stairs with the finishing material produced at the factory or on-site site to the site,
Since it is floated on the sloped slab for on-site construction and it is fixed by backfilling the grout, the number of on-site steps can be significantly reduced compared to the conventional construction method, and the construction period can be reduced to about half that of the conventional method. It can be shortened. Since it can be constructed on-site in a short period using precast concrete stairs with a finishing material, the work is extremely unlikely to be affected by the weather. After the grout is injected, the precast concrete stairs with the finishing material are stabilized, so that it can be used as a safety passage as it is, and the period of road closure during construction can be shortened. Since the precast concrete stairs into which the finishing material is driven are used, the quality of the finishing material such as tiles and stones can be improved without floating, peeling, efflorescence and the like. Further, since precast concrete stone steps are not used, it is not necessary to take troublesome anti-slip means. There is no need for on-site extremely complicated and troublesome stair bar arrangement, stair formwork assembly, stair concrete work, plastering and tile work, etc., and the work is extremely easy, and a small number of workers are sufficient. It is easy to secure personnel and processes. Since there is little work on the inclined part, work safety is high. From the above, the cost can be significantly reduced compared to the conventional method.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing an example of a method for constructing a precast concrete staircase according to the present invention.

FIG. 2 is a cutaway side view of the same example.

FIG. 3 is a plan view of a precast concrete staircase of the same example.

FIG. 4 is an enlarged cutaway side view of a main part of the same example.

FIG. 5 is an enlarged plan view of the main part.

FIG. 6 is an enlarged cutaway front view of the main part.

FIG. 7 is an enlarged cutaway side view of another main part of the same example.

FIG. 8 is a plan view showing members of the main part.

FIG. 9 is a cutaway side view of a main part showing a conventional example.

[Explanation of symbols]

 1 ... Inclined slab 2 ... Waterproof layer 3 ... PC stairs 4 ... Grout 5 ... Landing 6 ... Mortar 11 ... Load receiving part 12 ... Anchor bolt 13 ... Nut 14 ... Curing iron plate 31 ... Tile 32 ... Notch 33 ... Level with hanging ring Adjusting hardware 34… Angle 35… PC stair bottom end hardware 321… Insert 322… Bolt 331… L-shaped plate 332… Suspension ring 333… Through hole 334… Screw hole 335… Adjusting bolt 336… Lock nut 351… Supporting member 352… Screw hole 353… Adjusting bolt 354… Lock nut 355… Through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Endo 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo main store (72) Inventor Hideyoshi Sudo, 21-chome, Ginza, Chuo-ku, Tokyo No. 1 Stock Company Takenaka Corporation Tokyo Main Store

Claims (2)

[Claims] 1. A precast concrete staircase characterized in that a precast concrete staircase in which a finishing material is driven is appropriately floated and installed on the constructed sloping slab, and grout is injected into a gap generated by the installation to cure the staircase. Construction method. 2. After constructing a waterproof layer on the constructed slanted slab, a precast concrete staircase in which a finishing material is driven is appropriately floated and installed on the waterproof layer, and grout is injected into the gap created by the installation. A precast concrete stair construction method characterized by being hardened by hardening.