JPH0483051A - Construction of reinforced concrete staircase and staircase handrail precast concrete panel and staircase step form using for this - Google Patents

Abstract

PURPOSE:To shorten construction period by timbering a steel staircase step form through the arrangement of reinforcing on a staircase site back form assembled between a staircase handrail of precast concrete panel and a circumferential wall, by placing concrete between the steel staircase step form and the staircase site back form, and by removing the form thereafter. CONSTITUTION:Upper and lower step parts 3a, 3b of a divergent staircase main body 3 are formed on the upper part of a staircase handrail precast concrete panel 2, and upper and lower handrail parts 2a, 2c, and upper and lower step side beams 2b, 2d are formed. Inserts 21... for supporting a reinforcement 31 of the step parts 3a, 3b of the main body 3, are arranged in two lines, while a pair of connection metallic materials 22... of a steel plate, are protruded on the upper end surface, and notches 23... and connection metallic materials 24... are provided on the lower end surface. The reinforcement 31 on a staircase site back form 5 is welded to the reinforcing bar preliminarily protruded from the circumferential wall, and steel staircase step forms 6, 7 are arranged, and are timbered by an angular pipe 9 and the like. The staircase can thus surely be integrated with the concrete panel 2.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for constructing reinforced concrete stairs, a precast concrete version of a stair handrail, and a stair step formwork used therein.

``Prior art and problems to be solved by the invention'' In recent years, precast concrete slabs have been increasingly used in steel-framed reinforced concrete buildings, reinforced concrete buildings, etc.

However, it is difficult to use precast concrete for complex, uneven areas such as staircases, or areas that cannot be subdivided. ■Transportation is difficult.

■During transportation, the assembly special number may be damaged.

■It is not easy to assemble.

■In the case of stairs made of non-slip materials, there is a problem with the method of fixing the formwork during concrete pouring.

■If side anchor reinforcement is required, the formwork will be complicated.

■As there is a certain limit to factory production, sometimes factory production cannot adequately meet demand, resulting in longer construction times.

There are other problems.

Of course, if you rely only on on-site construction, the above problems will not occur, but as is well known, ■Assembling and dismantling the formwork for stairs and stair handrails is extremely time consuming.

■Since dismantled formwork materials and repurposed materials are always placed in the stairwell, they often pose a hindrance to traffic.

■It is necessary to apply mortar on the treads and risers of the R tier more than once, and closing the passageway during construction will hinder the work.

There are other problems.

The present invention aims to solve these problems and improve workability and economic efficiency.

"Means for Solving the Problems" The method for constructing reinforced concrete stairs according to claim 1 of the present invention is to form a stair handrail that also serves as a stair stringer in the central part of the stair interior surrounded by a peripheral wall using a precast concrete slab. Assemble the stairway back formwork at the appropriate location between the stairway handrail precast concrete slab and the surrounding wall, place the specified reinforcement on top of the stairway lift formwork, and place one or several pieces of reinforcement on top of the reinforcement. A reusable steel stair stair form formed in the divided body is placed and supported, and concrete is poured between the stair stair form and the above-mentioned stair back form, and after the specified strength is achieved. The stair handrail precast concrete version according to claim 2, characterized in that the stair step formwork and stairway back formwork are removed and the poured concrete is cured and hardened, is suitable for stair handrails and stair stringers. form a precast concrete slab with an exterior shape of
The precast concrete slab is characterized by having an appropriate number of inserts arranged in the side girders to support the reinforcement of the stairs, and also equipped with connecting hardware at the upper and lower ends.

In addition, the stair stair formwork according to claim 3 is provided with a reusable steel formwork for forming the treads and risers of the stairway, and a ventilation hole is bored at an appropriate position in the tread portion of the formwork, so that , is characterized by the addition of hanging hardware at appropriate locations on the exterior surface.

``Function'' With the above structure, the stair handrail precast concrete version and the stair body constructed on site can exhibit their respective advantages, and the stair step formwork eliminates the disadvantages of conventional formwork and can be used in various locations. make it possible to achieve the term objectives.

"Example" The drawing shows an embodiment of the invention relating to a folding staircase.

FIG. 1 shows a reinforced concrete folding staircase according to the present invention in which a reinforced concrete folding staircase main body 3 is integrally connected to a stair handrail precast concrete version 2 built in the center of a staircase room 1 on-site.

The stair main body 3 is also integrally connected to the peripheral wall of the stair room 10 or to the small beams as in the conventional case. Regarding this point, since it is the same as in the conventional case, the explanation will be omitted.

The stair handrail precast concrete version 2 has a height that extends to the floor height of each floor, and has an upper step 3a of the bent staircase main body 3 at its upper part, and a lower step 3a of the bent staircase main body 3 at the bottom.
b, as shown in FIGS. 3 to 5, a side surface shape that matches the lower stage handrail part 2a, the lower stage side beam part 2b, the lower stage handrail part 2c, and the lower stage side beam part 2d. (C-shape) and the required thickness, and the upper step part 3a and the lower step part 3b of the folded staircase main body 3 are formed on one side of the lower step side girder part 2b and the other side of the lower step side girder part 2d. A large number of inserts 2) supporting the reinforcing bars 31 are arranged in two rows, a pair of connecting metal fittings 22, 22 made of mesh plates are provided protruding from the horizontal upper end surface, and a pair of connecting hardware 22, 22 made of mesh plates are provided on the horizontal lower end surface corresponding to these. Notch 23.23
and a similar connecting metal fitting 24. is provided in the notch.
There are 24.

The stair handrail precast concrete version 2 is manufactured on-site, and has internally arranged mesh reinforcements 25 in which reinforcing bars are arranged vertically and horizontally, and furthermore, a reinforcing mesh reinforcement 26 in which reinforcing bars are arranged diagonally in the middle part. It is arranged. Further, grooves 27, 27 are formed in the portion where the inserts 2) are arranged in two rows.

The connecting hardware 22, 22, 24, 24 on the upper end surface and the lower end surface are as follows:
The base is planted in the concrete of the stair handrail precast concrete slab 2, and is prevented from being pulled out with anchor reinforcements 28, 28, and two upper and lower through holes 22), 2 are provided in the protruding parts, respectively.
2), 241, 241 are bored, one of which is formed into a vertically long hole and the other is formed into a horizontally long hole.

The stair handrail precast concrete version 2 manufactured in this manner at the site is erected in the central part of the stairwell 1, and then the bent staircase body 3 is constructed on site, and the construction procedure is as follows.

1. The manufactured stair handrail precast concrete version 2 was erected in the center of the stairwell 1 by hanging the sling wire on the connecting hardware 22.22 on the upper end surface and lifting it with a crane etc. Connecting hardware 22 placed on the upper end surface or base plate of the stair handrail precast concrete slab 2 and protruding upward therefrom as shown in FIG.
．． Connect metal fittings 24 and 24 on the lower end surface to 22 with bolts 29 and 29, and fill remaining notches 23 and 23 with mortar 4.

(2) Assemble the stair lift formwork 5 of the upper step 3a, lower step 3b and landing 3c (Fig. 2). Note that existing means may be used for shoring.

(2) A predetermined reinforcement 31 is placed on top of the stair lift formwork 5 (
Figure 2). At this time, the horizontal reinforcements of the upper step part 3a and the lower step part 3b are connected to a large number of inserts 2) arranged on the stair handrail precast concrete slab 2.

Note that the peripheral wall side is joined by welding or the like to reinforcing bars that have been made to protrude from the peripheral wall in advance.

(2) Steel stair formworks 6.7 consisting of left and right sides are arranged on the reinforcement 31 of the upper step part 3a and the lower step part 3b, respectively, and supported appropriately with square pipes 9 etc. Figure 2, 7th
(Fig. 12).

■Pour concrete into the formwork and use a vibrator etc. to pack it in thoroughly so that there are no blank spaces.

(2) After a predetermined period of time has elapsed after pouring and a predetermined strength has been achieved, the stair step formwork 6.7 and the stair lift formwork 5 are removed and used for the next use.

■0 surface finish and a non-slip 8- is attached to the tip of the tread of each step (Fig. 1).

By the way, the number of steps is slightly different between the stair step formwork 6 for the upper step portion 3a shown in FIGS. 587 to 10 and the stair step formwork 7 for the lower step portion 3b shown in FIGS. Other than that, they are the same.

These stair formworks 6.7 consist of left and right halves 6a, 6b, 7a, and 7b, respectively, for convenience of attachment and detachment, and each formwork is
A frame 62 behind which the periphery of the stepped panel 61.71 is placed.
72, and several crosspieces 63-. 73, and hang hardware 6t-, 74 on these crosspieces accordingly.
8, hang the sling wire on these hanging hardware,
It can be attached and detached by lifting it with a crane or the like.

In addition, each stepped panel 6L71 has a plurality of ventilation holes 68-. 78- is drilled to obtain exhaust air during concrete pouring and to ensure sufficient filling.

Furthermore, on the inner surface of each stepped panel 61.71, gutter forming molding materials 65, 65, 75.75 are attached to the left and right outer edges, and a paving board 66.76 is attached to one inner edge. The mold material 67 for molding the concave portion is attached to close the seam, and non-slip is attached to the tip of each tread.
−． 77- is attached.

"Effects of the Invention" According to the invention of claim 1, since the stair handrail precast concrete slab for the stair handrail and stair side girder is used, the assembly and dismantling of formwork on site can be significantly reduced.
Dismantled formwork materials, repurposed materials, etc. can be placed in the stairwell to reduce the hindrance to passage, and the stair handrail precast concrete slab can be formed into a flat slab, making it easy to transport and assemble with less damage. (In addition, since the staircase itself is constructed on-site, it can be easily and reliably integrated with the precast concrete version of the stair handrail that has been erected. Furthermore, there is no need for side anchor reinforcing bars, etc., making the formwork simple. In addition, since the treads and risers are formed using reusable steel stair molding frames, poured concrete can be filled sufficiently and accurately, providing good base forming, and the application of finishing mortar can be completed in one step. In addition, the period during which passages are closed during construction can be shortened, molding can be performed without any problems even with non-slip molding, and the formwork can be attached and removed and repurposed very easily and quickly.Furthermore, factory production The disadvantages of precast concrete slabs, which have a certain limit, can be minimized, construction period can be shortened, and costs can be reduced.

According to claim 2, in addition to the above-mentioned effects as a stair handrail precast concrete version, inserts are provided in the side girder parts, so the reinforcement of the stair can be connected, and the stair reinforcement can be connected to the stair main body. It can be more strongly integrated, and since it has connecting hardware at the upper and lower ends, it is possible to properly join with the connecting hardware, and it is convenient because it can be used as a hanging hardware during construction.

According to the invention of claim 3, in addition to the above-mentioned effects as a stair molding frame, since ventilation holes are provided at appropriate locations in the tread portion, internal air can be quickly exhausted during concrete pouring. This makes it possible to properly fill every corner with concrete without any gaps, and since hanging hardware is attached to the appropriate locations on the outside, it can be easily lifted with a crane, etc., making it convenient for attaching and removing formwork. It is.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a cutaway side view of a reinforced concrete staircase, Fig. 2 is a cutaway side view of the same during construction, and Fig. 3v! J is an enlarged side view of the stair handrail precast concrete version, Fig. 4 is a front view of the same, Fig. 5 is an enlarged cross-sectional view of the main part of Fig. 3 v-vwA, and Fig. 6 is an important part showing the joint state. 7 is a plan view of the stair step formwork for the upper step, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. 9 is a cross-sectional view taken along the line N-IX in FIG. 7. 10 is an enlarged sectional view taken along the line XX in FIG. 8, FIG. 11 is a plan view of the stair step formwork for the lower step, and FIG. FIG. 1... Staircase 2... Stair handrail precast concrete version 2a...
・Upper stage flat sliding part 2b...Upper stage side girder part 2c.
...Lower stage handrail part 2d...Lower stage side girder part 3.
...Folded staircase body 3a...Upper step part 3b...
・Lower step part 3c...Landing 4...Mortar 5...Stair lift back formwork 6.7...Stairway forming frame 8...Non-slip 9...Square vibe 2)...Insert 22 .24... Connection hardware 23... Notch 25... Mesh bar 26... Reinforcement menonyu bar 27... Concave groove 28... Anchor bar 29... Bolt/naft 31... Reinforcement 61.
71... Stepped panel 62, 72... Frame 63
．． 73... Crosspiece 64 , 74... Hanging hardware 65.75... Gutter forming mold material 66.76...
- Layout plates 67, 77...Non-slip mounting is for recessed molding material 68.78...Vent hole 22). 2
41...Through hole site, I' and 舅劃八托

Claims (3)

[Claims] (1) A stair handrail that also serves as a stair girder is formed from a precast concrete slab in the center of the staircase interior surrounded by the surrounding wall, and a stair lift form is placed at an appropriate location between the stair handrail precast concrete slab and the surrounding wall. Assemble the stairway formwork, place the specified reinforcement on top of the stairway formwork, and place and support the reusable steel stairway formwork, which is formed into one piece or several divided pieces, on top of the reinforcement. Then, concrete is poured between the stair step form and the stair lift form, and after the specified strength is achieved, the stair step form and the stair lift form are removed and the poured concrete is cured. A construction method for reinforced concrete stairs characterized by hardening. (2) Form a precast concrete slab with an external shape that matches the stair handrail and stair stringers, provide the side beams of the precast concrete slab with an appropriate number of inserts to support the reinforcement of the stairs, and A precast concrete version of a stair handrail characterized by being equipped with connecting hardware at the bottom end. (3) Provide reusable steel formwork to form the treads and risers of the stairs, and drill ventilation holes at appropriate locations in the treads of the formwork;
The stair step formwork is also characterized by having hanging hardware attached to appropriate locations on the outside.