JPH04323464A - Formwork for staircase - Google Patents

Abstract

PURPOSE:To shorten construction period by reusing a formwork for a staircase arranged on the backside of a frame body at a prescribed space so as to position templates on the positions to be step difference part walls of respective step parts of a staircase, also at constructing another staircase. CONSTITUTION:Supporting bases 20 are provided on respective underside of both ends of a lateral bar 12, the supporting bases 20 are loaded on a building face on which a staircase is built, and a formwork 10 is detachably supported with the bases so as to be at a prescribed inclination. Next, longitudinal bars 14 meeting at right angles with the lateral bars 12 are provided on the underside of the lateral bars 12, and templates 16 extendingly existing in the lengthwise direction of the lateral bars are projectingly provided at prescribed intervals on the underside of the longitudinal bars 14. Cement paste kneaded paste-likely is poured and filled into the gap between the formwork 10 and the building face, and solidified. After solidification of the cement paste, the formwork 10 is removed from a concrete staircase, the removed formwork 10 is loaded again on a building face to be built with another staircase at a prescribed angle, and reused as the formwork 10 for the staircase.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stairway formwork, and more particularly to a stairway formwork into which a paste-like cement paste is poured when constructing concrete stairs.

0002

[Prior Art] Conventionally, concrete stairs have been constructed by assembling the formwork of the stairs using concrete panels (hereinafter sometimes referred to as konpane) on the construction surface, and then applying cement paste mixed into a paste. It is formed by a series of steps in which cement is poured into a mold and the mold is removed after the cement has hardened.

0003

[Problems to be Solved by the Invention] Conventionally, it is necessary to assemble formwork using a control panel for each concrete staircase to be constructed. The work of assembling such formwork varies depending on the scale of the stairs to be formed, but it usually takes about two days for four formwork workers. However, in the recent situation where there is a shortage of civil engineering workers, especially formwork workers, the formwork creation process is becoming the rate-limiting process for stair construction, and the period of the formwork creation process is the deadline for stair construction. have a major impact on In addition, with conventional construction methods, even when constructing multiple stairs with approximately the same stair dimensions such as slope angle and step width, it is necessary to create approximately the same formwork for each stair, and the formwork must be created each time. It is necessary to set up the process. Therefore, when constructing a plurality of concrete stairs, an object of the present invention is to
To provide a formwork for stairs which can be used for each other and substantially eliminates the need for the process of forming the formwork.

0004

[Means for Solving the Problems] As a result of studies to achieve the above-mentioned object, the inventor of the present invention has developed a method that allows the template to be placed on the back side of the frame so that the template is located at the position that will be the wall surface of the stepped portion of each step portion of the staircase. The inventors have discovered that a stair formwork in which a plurality of templates are protruded at predetermined intervals can be reused for the construction of other stairs, and have arrived at the present invention. That is, the present invention provides a stair formwork into which cement paste mixed into a paste is poured when constructing concrete stairs, and the formwork has an inclination angle equal to that of the stairs to be constructed. , comprising a frame body placed on a construction surface for constructing the stairs, and a template projecting from the back surface of the frame toward the construction surface of the stairs to form each step wall surface of the stairs. In the formwork for stairs.

[0005]

[Function] The stair formwork of the present invention allows the formwork to protrude from the frame toward the construction surface by placing the frame on the construction surface on which the stairs are to be constructed at an inclination angle equal to the inclination angle of the stairs. are the wall surface positions of the step portions of each step portion of the stairs. Next, a cement paste kneaded into a paste is poured into the gap between the formwork and the construction surface, and after leveling the top surface of each step, the filled cement paste is solidified. By lifting the formwork with a crane or the like after the cement paste has solidified, the formwork can be easily released and removed from the concrete staircase. The removed formwork is placed again at a predetermined angle on the construction surface for constructing another staircase, and is reused as formwork for another staircase.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail with reference to the drawings. FIG. 1 is a plan view showing one embodiment of the present invention, and the formwork 1
0 is a frame body in which a plurality of vertical bars 12 and horizontal bars 14 are combined. Vertical bars 12 and horizontal bars 14 forming such a frame body
As shown in FIG. 2, which is a side view of FIG. 1, I-type steel is used. The formwork 10 is provided with support stands 20 on each lower surface side of both ends of the horizontal beam 12, and the support stands 20 are placed on the construction surface on which the stairs are constructed, and the formwork 10 is set at a predetermined inclination angle. I will support you as much as possible. A vertical bar 14 that is orthogonal to the horizontal bar 12 is provided on the lower surface side of the horizontal bar 12.
A template 16 extending in the longitudinal direction of the horizontal bar 12 is provided on the lower surface side of the horizontal bar 12.
is installed protrudingly. As shown in FIG. 1, the templates 16 are provided perpendicularly to the vertical bars 14 at predetermined intervals. The templates 16 are members that form the wall surface of the step portion of the staircase, and the interval between the templates 16 corresponds to the step width of the staircase. In addition, the template 16 is a steel plate 1 as shown in FIG.
So that the angle of 6a with respect to the vertical beam 14 becomes the protrusion angle θ,
One end of the steel plate 16a is welded to the vertical beam 14. Furthermore,
The steel plate 16a has a rib 1 whose one end is welded to the vertical beam 14.
5 and a reinforcing plate 16b welded to the rib 15. Note that the vertical beam 1 of the steel plate 16a in this embodiment
The protrusion angle θ with respect to 4 is the formwork 1 on the construction surface for constructing the stairs.
0 was set at an angle perpendicular to the step surface of the stairs. Such a steel plate 16a is provided with a chamfering member 16c for chamfering the corners of the step portion to be formed. In the formwork 10 of this embodiment, as shown in FIG. 2, a chevron portion 18 is formed on the upper surface of each vertical bar 14. In winter or the like, a heater such as a stove can be inserted into the space formed by covering the chevron portion 18 with a sheet or the like to prevent the concrete poured into the formwork 10 from freezing. Further, the horizontal bars 12 constituting the formwork 10 of this embodiment are I
Since shaped steel is used, each end face of the horizontal bar 12 is I-shaped as shown in FIG. Therefore, the hanging tools 22 having a U-shaped cross section as shown in FIG. 4 can be inserted into each end of the horizontal beam 12, and the formwork 10 can be suspended by a crane or the like.

The formwork 10 of this embodiment shown in FIGS. 1 and 2 is placed on a slope A on which stairs are to be constructed, as shown in FIG. At that time, the position, height, etc. of the support stand 20 are adjusted so that the angle of inclination of the formwork 10 is equal to the angle of inclination of the stairs to be constructed. In this embodiment, when the inclination angle of the vertical bar 14 and the inclination angle of the staircase to be formed are equal, the steel plate 16a of the template 16 is made perpendicular to the step surface of the staircase. The protrusion angle θ (FIG. 3) of the steel plate 16a is adjusted. In this manner, the time required for placing the formwork 10 of this embodiment on the inclined surface A and adjusting the inclination angle of the formwork 10 can be performed by two civil engineering workers in approximately 2 hours. Next, the gap between the formwork 10 and the inclined surface A is poured and filled with cement paste kneaded into paste form, thereby flattening the upper surface of the step portion. At this time, the template 16 of the formwork 10 forms the wall surface of the stepped portion of the step portion. Next, the formwork 10 is left as it is until the filled cement paste (concrete) hardens. At this time, if there is a risk that the concrete may freeze in the winter, etc., place a sheet or the like over the chevron portion 18 of the formwork 10 and place a kerosene stove or similar object in the space formed between it and the concrete surface. A heating means can be inserted to prevent concrete from freezing. Once the filled concrete has solidified, the formwork 10 is released from the concrete staircase. In this embodiment, hanging tools 22 shown in FIG. 4 are attached to both ends of the horizontal beams 12 of the formwork 10, and the formwork 10 can be easily released from the concrete staircase by lifting it with a crane or the like. In addition, concrete stairs and formwork 10
If the formwork 10 is in close contact with the concrete stairs, and it is difficult to separate the formwork 10 from the concrete stairs using a crane, etc., lift the formwork 10 slightly using a jack etc. to separate it from the concrete stairs, and then remove the formwork 10 from the concrete stairs using a crane. The formwork 10 may be lifted up using a method such as the following. Concrete stairs constructed in this way,
The corners of the step portion are chamfered, and the removed formwork 10 can be reused as formwork for other stairs. Furthermore, the construction method using the formwork 10 of this embodiment is as follows:
Compared to the conventional construction method that uses formwork using control panels, it eliminates the need for a formwork process to form formwork.
The construction period can be shortened and the number of required personnel can be significantly reduced.

In the embodiments described above, the template 16 forming the wall surface of the step part of the staircase is fixed to the vertical beam 14 and the rib 15 by welding, but the end of the template 16 is fixed to the vertical beam 14 and the rib 15 by welding. The template 16 may be rotatably attached to the vertical bar 14 and connected to the other end of a turnbuckle or the like whose one end is fixed to the vertical bar 14. According to this template 16, the vertical bar 14 and the template 1
6 can be changed to a desired angle using a turnbuckle or the like. Furthermore, when filling the gap between the inclined surface A and the formwork 10 with cement paste, a flat plate may be placed in advance on the surface that will become the step surface. By placing a flat plate in this manner, it is possible to eliminate the need to flatten the step surface after filling with cement paste. Such a plate may have a surface carved with engravings or the like.

[0009]

According to the construction method using the stairway formwork of the present invention, the formwork can be reused, so that the step of forming the formwork can be omitted. For this reason, at a time when civil engineering workers, especially formwork workers, are in short supply, by using the stairway formwork of the present invention, it is possible to construct concrete stairs compared to the conventional method of forming formwork using control panels. It is possible to shorten the construction period and reduce the number of required personnel.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a partial sectional view showing how the template 16 is attached to the formwork.

FIG. 4 is an explanatory diagram illustrating a hanging tool for lifting the formwork shown in FIG. 1;

FIG. 5 is an explanatory diagram illustrating how the frame shown in FIG. 1 is used.

[Explanation of symbols]

10 Formwork 12 Horizontal beams that make up the frame 14 Vertical bars that make up the frame 16 Template 18 Yamagata section 20 Support stand θ Projection angle

Claims (1)

[Claims] Claim 1: In a stair formwork into which cement paste mixed into a paste is poured when constructing concrete stairs, the formwork includes: It is characterized by comprising a frame body placed on a construction surface for constructing the stairs, and a template that projects from the back surface of the frame toward the construction surface of the stairs to form each step wall surface of the stairs. Formwork for stairs.