JPH01178656A - Rapid construction of staircase - Google Patents

Abstract

PURPOSE:To enable rapid stair construction work, by pouring concrete/mortar containing a quick setting agent into a concrete placing position whereby the placed concrete/mortar is rapidly solidified. CONSTITUTION:A concrete placing hose 1 is connected to a transmitting conduit 2 which is in turn connected to a pressure-feeding means such as pumps, and is provided with a tip end cover 3 for a hollow rotating shaft 5 and stirring wings 5a, 5g. Inlets 5c, 5d for a quick setting agent is also formed on the hollow shaft 5 which is rotatably driven by a driven motor 10. With the drive motor operated, the hollow shaft is rotated together with the stirring wings 5a, 5g inside of the top end cover 3 to thereby evenly stir and admix concrete/mortar 6 fed under pressure with the quick setting agent added through an inlet therefor. The mixture is then poured through an outlet 3a into an intended concrete placing position 21. As a result, a staircase 17 can be constructed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention uses a rapid setting agent for concrete mortar (here, "concrete mortar" means "concrete" or "mortar"). The present invention relates to a rapid construction method for stairs, in which steps are added to concrete and mortar during pouring (the same applies hereinafter), and stairs are constructed in a short time.

(b), Prior Art Conventionally, when constructing stairs for buildings, ordinary concrete mortar to which no quick setting agent was added was used.

(C) 0 Problems to be Solved by the Invention However, in such cases, since it takes time for the concrete/mortar to solidify, there is a drawback that the construction time becomes long and it takes a lot of time until the product can be put into use.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a rapid construction method for stairs, which allows stairs to be constructed in a short time.

(d) Means for solving the zero problem, that is, the present invention, when constructing the stairs (17), the concrete mortar (6) to which the quick-setting agent (7) has been added is poured into the concrete casting space (21). The concrete mortar (21) is injected into the concrete mortar (21) to rapidly solidify it after pouring.

Note that the numbers in parentheses, etc. are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings.
The same applies to the column ``I, Effect''.

(e) 0 effect With the above-mentioned configuration, the present invention is such that the concrete mortar (6) with the addition of the quick-setting agent (7) solidifies rapidly and the time until demolding is significantly shortened. It acts on

(f), Example Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a diagram showing an example of a staircase construction site to which an embodiment of the rapid construction method for stairs according to the present invention is applied; Fig. 2 is a front view showing an example of a concrete pouring hose; Figure 2 is a view from the ■ arrow of the discharge port of the concrete placement hose, Figure 4 is a diagram showing an example of the mix of concrete 1 and mortar used in the practice of the present invention, and Figure 5 is a quick setting agent. FIG. 6 is a diagram showing the results of a compressive strength test of concrete mortar to which is added, and FIG. 6 is a diagram showing another embodiment of the present invention.

First, the concrete 1-casting hose 1 used for carrying out the present invention will be explained. As shown in FIG. 1, the concrete placement hose 1 has a concrete 1-conveying pipe 2, and the concrete conveying pipe 2 is equipped with means for pumping concrete 1 to mortar such as a concrete pump (not shown). Connected. The tip 2a of the concrete 1-conveying pipe 2 is bent slightly upward in the figure, and a cover formed in a cylindrical shape from a flexible material such as a comb is attached to the tip 2a. 3 is connected to cover the outer periphery of the tip 2a.The cover 3 extends to the left in the figure, and its tip has a discharge port 3a with a circular cross section. -1. A hollow rotating shaft 5 is provided in the conveying pipe 2 so as to be freely rotatable so as to penetrate through the pipe wall 2b of the concrete conveying pipe 2, and is located at a position corresponding to the cover 3 at the tip of the rotating shaft 5. , two stirring blades 5a, 5g are provided in a double layer in the directions of arrows A and B, which are the supply directions of concrete and mortar. As shown in the figure, the blade 5b is formed by four 90° pitches.
As shown in FIG. 2, each blade 5b of the stirring blade 5a on the right side of FIG. They are formed in such a way that they communicate with each other. Note that a large number of quick-setting agent addition holes (not shown) are bored in the surface 5e of each blade 5b of the stirring blade 5a so as to communicate with the quick-setting agent supply path 5d to the outside.

On the other hand, on the right side of the rotating shaft 5 in FIG. 2, a drive motor 10 is rotatably provided via a swivel joint 9. The quick-setting agent 7 is provided in a loop shape to supply the quick-setting agent 7 to the quick-setting agent supply path 5c formed in the shaft 5.

Since the concrete 1 and pouring hose 1 have the above configuration, the concrete pouring hose 1 can be used to construct the stairs 1.
7 is to be rapidly constructed, as shown in FIG. 1, a lower formwork 19 is installed diagonally, and reinforcing bars are arranged on the lower formwork 19. When the reinforcement is completed, the height Hl of each step of the stairs 17
A weir board 20 having a height equivalent to
9 and the existing step portion 17b, a concrete casting space 2N with an open upper part is formed. Next, in this state, concrete mortar 6 of a normal composition as shown in FIG. 4, for example, is supplied to the concrete conveying pipe 2 of the concrete placement hose 1 without the quick-setting agent. The concrete 1 and mortar 6 supplied to the concrete conveying pipe 2 of the concrete placement hose 1 are fed under pressure from the right side in FIG. Concrete 1 is supplied from 3a to the casting space 21, and at that time, the drive motor 10 is driven to rotate the rotating shaft 5.
At the same time, the quick-setting agent 7 is supplied to the quick-setting agent supply path 5C of the rotating shaft 5 from the quick-setting agent supply pipe 1 through the swivel joint 9. The quick-setting agent used here is calcium alumina (CaO-A I
This is an aqueous solution of O-CaSO). Then, the stirring blades 5a and 5g inside the cover 3 rotate together with the rotation of the rotary shaft 5, and stir the concrete/mortar 6 that has been force-fed inside the concrete IJ-1 conveying pipe 2 toward the discharge port 3a. Further, from the quick-setting agent addition hole provided in each blade 5b of the stirring blade 5a, the quick-setting agent 7 is added and supplied via quick-setting agent supply channels 5c and 5d, and the added quick-setting agent 7 is added to the concrete. - Together with the mortar 6, it is uniformly stirred by the doubly provided stirring blades 5a and 5g and is discharged to the outside from the discharge port 3a, and is injected into the concrete 1 and the pouring space 21.

Although a large number of aggregates are placed in the concrete mortar 6, a cover 3 (well, since it is made of a flexible material) covers the outer periphery of the stirring N5a, 5g.
These aggregates and the like are the stirring blades 5a.

Even if the cover 3 is caught between the tip 5f of the 5g blade 5b and the cover 3, the cover 3 will be deformed, so there is no possibility that such aggregates will be caught between the blade 5b and the cover 3. Therefore, the stirring operation of the concrete 1, mortar 6, and quick-setting agent 7 by the stirring blades 5a and 5g should be performed smoothly.

In the above embodiment, two stirring blades 5a and 5g for stirring concrete and mortar were provided, but in the present invention, multiple stirring blades 5a and 15g are provided in the direction of supply of concrete and mortar. Of course, any number of sheets may be provided, including two or more.

In this way, once the concrete 1 and the pouring space 21 are filled with poured concrete and mortar 6, the weir plate 20 is held in that state for a while, and the poured concrete and mortar hardens to the extent that it can stand on its own. Then,
The weir plate 20 is demolded.

existing stepped portion], 7 step portion with a height of H above b], 7. a is constructed as shown by diagonal lines in FIG.

Next, as shown in Figures 1-7 to 1-7, on the stepped section 1.7a constructed this time, the weir plate 20 is again installed, and concrete and mortar 6 are poured in the same manner. The stepped portions 17a are continuously constructed in a manner that they are stacked upward in FIG.

In addition, concrete mortar 6 to which quick setting agent 7 was added
The test results of compressive strength according to the addition ratio of quick-setting agent 7,
As shown in Fig. 5, as is clear from this figure, the concrete mortar 6 containing 10% or more of the quick-setting agent 7 is
It becomes possible to remove the mold within about 1 hour after pouring [usually 2 hours]
Since it is possible to remove the mold with a strength of about kg/cr&, it is actually possible to remove the mold much faster (about 10 minutes), making it possible to rapidly construct the stairs 17. . The 28-day strength is also comparable to that of ordinary concrete and mortar without the addition of quick-setting agents, and the strength is sufficient for practical use.

In addition, the present invention provides that any construction method may be used to construct the stairs, as long as concrete and mortar containing an accelerating agent are used.
As shown in the figure, it is of course possible to use a formwork 22 that forms the entire shape of the staircase to cast a plurality of steps 17a at once.

(g) 6 Effects of the Invention As explained above, according to the present invention, when constructing the stairs 17, concrete 1...mortar 6 to which the quick-setting agent 7 has been added is injected into the concrete placement space 2]. Since the structure is designed to allow the concrete and mortar to solidify rapidly after pouring, it is possible to construct the stairs 17 in a short period of time. It can be put to use.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a staircase construction site to which an embodiment of the rapid construction method for stairs according to the present invention is applied; FIG. Figure 3 is a view of the discharge port of the concrete 1 and pouring hose shown in Figure 2 in the direction of the ■ arrow, Figure 4 is a diagram showing an example of the mix of concrete and mortar used in the practice of the present invention, and Figure 5 is FIG. 6 is a diagram showing the results of a compressive strength test of Conc IJ-1-mortar to which an quick-setting agent has been added, and is a diagram showing another embodiment of the present invention. 6. Concrete/mortar 7 Quick-setting agent 17 ・Stairs - 21 Concrete pouring space Applicant Mitsui Construction Co., Ltd. agent Patent attorney Phase 1) Forging (and 2 others)

Claims (1)

[Claims] A staircase constructed by injecting concrete and mortar to which a quick-setting agent has been added into the concrete placement space to rapidly solidify the concrete and mortar after placement. Rapid construction method.