JP3241896B2 - Steel frame stair hang down method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel staircase hang-down method in which a permanent steel staircase on a basement floor is used as a temporary staircase at the time of root cutting.

[0002]

2. Description of the Related Art In recent years, a reverse striking method is often employed in the construction of an underground skeleton of various concrete buildings due to the advantage of shortening the construction period. This reverse striking method is to construct the underground skeleton sequentially by constructing the pier and constructing the pillar, then repeating the root cutting and framing construction to the underground, and not only the early construction of the underground skeleton but also It is also excellent in that the ground frame construction can be performed simultaneously.

[0003]

However, in this reverse striking method, usually, the floor of the first floor above the ground, which also serves as the working floor, is constructed, and then the floors of the lower floor are sequentially formed. Until the floor is completed, it is not possible to assemble and use the main steel stairs. For this reason, temporary elevating equipment is exclusively used at the time of root cutting. Therefore, it takes a lot of time to assemble and disassemble the elevating equipment, and the construction of the permanent steel stairs is delayed, and the advantage of the angled reverse striking method is reduced. In addition, the temporary elevating equipment has difficulty in terms of convenience and safety. Therefore, the present invention solves the above-mentioned conventional problems by allowing the permanent steel staircase to be temporarily used as an elevating facility in a reverse driving method, and at the same time,
It is intended to reduce costs.

[0004]

In order to achieve the above object, the present invention provides a construction in which a permanent steel staircase on a basement floor is suspended from a preceding work floor, and the permanent steel staircase is adapted to the progress of root cutting. It is characterized by being inserted downward as needed.

[0005]

[Function] Since the above construction is adopted, the permanent steel stairs which are finally fixed to the underground skeleton can be temporarily used for the elevating equipment, and the conventional temporary elevating equipment can be reduced to unnecessary or extremely small. enable.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the steel frame staircase hang-down method of the present invention, and FIGS. 1 to 5 show construction procedures. Hereinafter, this will be described sequentially. (1) First step (Fig. 1) First, a hill stop and a timber pillar are constructed to construct a floor 1 on the ground floor, which also serves as a working floor, and the floor 1 on the ground floor, 1 6 forms an opening 2 for a permanent steel staircase also shown in FIG. 6 which is an enlarged plan view, and has a steel pillar 31 at each of the four corners of the permanent steel staircase 3 at an appropriate upper edge of the opening 2. The bracket 4 temporarily. Next, the first root cutting A suitable for the construction of the first basement is performed, and the concrete Ab is thrown into the first root cutting Aa. On the other hand, on the ground, the first layer portion 3a that is adapted to the lower half of the third floor of the basement floor, which is the lowest floor, of the main steel staircase 3 is assembled in correspondence with the first root cutting A. The first layer portion 3a has a plurality of steel supports 32 at the four corners and a plurality of steel support beams 32 joined alternately up and down, and a plurality of landings 34 are provided between the front and rear steel support beams 32. Steel stairs 33 are erected alternately, and required steel handrails 35 are attached. However, since the inner handrail at the landing 34 at the upper end becomes unnecessary later, the temporary handrail frame 15 is used. At the lower ends of the steel columns 31, frame reinforcing members 36 are provided horizontally. The reason why the first layer 3a is adapted to the lower half of the third basement floor is that the height of the third basement floor is designed to be approximately twice as high as that of the first basement floor. Then, the first layer portion 3a of the main steel staircase 3 is lifted by a crane or the like (not shown) via the suspending means 5 and inserted into the opening 2 so as to be inserted into each of the steel members. The upper part of the column 31 is bolted to each bracket 4
It is detachably connected with a nut and held in a suspended state. Further, a temporary slope pier 6 is provided between the discarded concrete Ab and the lower end of the first layer portion 3a of the permanent steel staircase 3. In this way, by temporarily using the first layer portion 3a of the permanent steel staircase 3, the floor 7, the first floor of the basement floor,
Underground work such as pillars and outer walls will be performed.

(2) Second step (FIG. 2) After the construction of the basement on the first floor of the basement floor, a second root cutting B suitable for the construction of the second floor of the basement floor is performed, and the second root cutting Ba is formed. Hit the discarded concrete Bb. On the floor 1 of the first floor of the ground floor, which is the working floor, the second half of the main steel staircase 3 is adapted to the upper half of the third floor of the basement floor, which is the lowest floor, corresponding to the second rooting B. The two-layer part 3b is assembled and connected and integrated with the upper end of the first layer part 3a. However, the handrail frame temporarily set at the landing 34 at the upper end of the previous time
Since 15 becomes useless, it is removed, but this is diverted to the landing 34 at the upper end this time. The structure of each part of the second layer part 3b is also the same as that of the first layer part 3a because the upper half of the third floor part of the basement floor is used. Next, at the upper end of the second layer portion 3b, suspending means 5
The bolts and nuts connecting the steel struts 31 of the first layer section 3a and the brackets 4 were removed last time while supporting the load with a crane or the like via
3a and the second layer portion 3b are lowered by operating the crane and the like, and when the lower end is sufficiently inserted into the second root cutting B, the upper portion of each steel column 31 of the second layer portion 3b is reached. Are detachably connected to the brackets 4 with bolts and nuts, and are held in a suspended state. In addition, vertical curing nets 37
Temporarily. A temporary slope pier 6 is extended between the discarded concrete Bb and the lower end of the first layer portion 3a of the permanent steel staircase 3 as in the previous case. In this manner, by temporarily using the first layer portion 3a and the second layer portion 3b of the permanent steel staircase 3, the underground framing work such as the floor 8, the pillars, the outer peripheral wall and the like of the second basement floor is performed.

(3) Third step (FIG. 3) After the construction of the basement on the second floor of the basement floor, a third root cutting C suitable for the construction of the upper half of the third floor of the basement floor is performed, and the third root cutting is performed. Pour concrete Cb into Ca. However, as described above, since the height of the third floor of the basement floor is set to be about twice as high as the first floor of the basement floor, the third root cutting C is the third floor of the basement floor. Up to almost half the floor height. Here, for reasons of workability and the like, the assembling work of the permanent steel staircase 3 on the floor 1 of the first floor of the ground floor, which is the work floor, is applied to all of the rest, that is, the first floor and the second floor of the basement floor. 3rd layer part
Assembled as 3c and connected and integrated with the upper end of the second layer 3b. Of course, the handrail frame temporarily set at the last landing 34
Remove 15 as it becomes useless. The structure of each part of the third layer portion 3c is also substantially the same as that of the first layer portion 3a, but the uppermost steel stairs 33 are formed to be long from the viewpoint of design. In this way, the first layer portion 3a to the third layer portion 3c integrated and connected.
Is lowered in the same manner as the previous time, the lower end is sufficiently inserted into the third root cutting C, and the middle part of each steel support 31 of the third layer portion 3c is attached to each bracket 4 with bolts and nuts. It is detachably connected and held in a suspended state. Further, the temporary tension of the vertical curing net 37 is appropriately extended. Between the discarded concrete Cb and the lower end of the third layer portion 3c of the permanent steel staircase 3, a temporary free step 9 is applied,
A temporary handrail 10 is attached. Again, the first of the main steel stairs 3
The underground skeleton construction on the third floor of the basement floor is performed by temporarily using the layer portions 3a to 3c, and a temporary slab 11 used as a work floor or the like is provided on the floor. The temporary slab
11 is to finally remove.

(4) Fourth Step (FIG. 4) After the construction of the upper half of the upper half of the third floor of the basement floor, a fourth root cutting D suitable for the construction of the lower half of the third floor of the basement floor or the foundation slab is performed.
Discard concrete Db at the 4th root incision Da. Next, the first layer portion 3a to the third layer portion 3c that are connected and integrated are lowered in the same manner as the previous time, and the lower end is sufficiently inserted into the fourth root cutting D (in this case, the final installation is performed). Position), the third layer portion 3c
The upper end of each steel column 31 is bolted to each bracket 4 above.
It is detachably connected with a nut and held in a suspended state. Since the foundation slab 12 is provided between the discarded concrete Db and the lower end of the third layer portion 3c of the permanent steel staircase 3, the space becomes higher than before, so that the stair frame 14 and the handrail frame are provided. A framed scaffold 13 incorporating 15 is provided, and a temporary slope pier 6 is used at the lower end to compensate for the shortage. Also, in this case, the first floor portion 3a to the third floor portion 3c of the permanent steel staircase 3 are temporarily used to perform the underground skeleton construction on the third floor of the basement floor. 12 will be built.

(5) Fifth Step (FIG. 5) After constructing the underground skeleton of the lower half of the third floor of the basement floor, that is, after constructing the entire underground skeleton, discard the concrete on the foundation slab 12
Hit Dc to fix the lower end of the permanent steel staircase 3 and place the permanent steel staircase 3 in the appropriate place in the completed underground skeleton.
Are properly fixed, the bracket 4 of the floor 1 on the ground floor which has been used for suspension from the beginning is removed, and the final installation of the permanent steel staircase 3 is completed.

[0011]

According to the present invention, the permanent steel staircase on the basement floor is suspended from the preceding work floor and inserted downward at any time in accordance with the progress of root cutting. The permanent steel staircase to be established can be temporarily used for lifting equipment,
Therefore, the conventional temporary elevating equipment can be reduced to useless or negligible, and the trouble of assembling and disassembling the elevating equipment can be eliminated. Can be eliminated, and the advantage of the reverse punching method can be fully exhibited. In addition, the cost can be significantly reduced. Further, since the permanent steel stairs are temporarily used for the elevating equipment in this manner, the convenience and safety in work can be improved unlike the temporarily elevating equipment.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a first step according to an embodiment of a steel staircase hang-down method of the present invention.

FIG. 2 is an explanatory view of a second step.

FIG. 3 is an explanatory view of a third step.

FIG. 4 is an explanatory view of a fourth step.

FIG. 5 is an explanatory view of a fifth step.

FIG. 6 is an enlarged plan view of a main part according to the first step explanatory view.

[Explanation of symbols]

1: Floor on the first floor of the ground floor 2: Opening for permanent steel stairs 3: Main steel stairs 31: Steel struts 32: Steel struts 33: Steel stairs 34: Steel landing 35: Steel handrails 36 ... frame reinforcing material 37 ... curing net 4 ... bracket 5 ... hanging means 6 ... slope pier 7 ... floor of the basement floor 1st floor 8 ... floor of the basement floor 2nd floor 9 ... free steps 10 ... temporary handrail 11 ... temporary slab 12 … Foundation slab 13… Framework scaffold 14… Staircase frame 15… Handrail frame A… Primary root cutting B… Secondary root cutting C… Third root cutting D… Fourth root cutting Aa, Ba, Ca, Da , Dc… Root incision Ab, Bb, Cb, Db… Discard concrete

Continued on the front page (72) Inventor Masanobu Hoshi 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd. Takenaka Corporation Inside the Tokyo Head Office (72) Inventor Ichiro Tomura 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd. Takenaka Corporation Tokyo Main Store (72) Inventor Yasuyuki Shibata 8-21-1, Ginza, Chuo-ku, Tokyo Takenaka Corporation Tokyo Main Store (56) References JP-A-6-108604 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) E04F 11/00-11/116 E02D 29/045 E04G 21/14

Claims (1)

(57) [Claims] 1. A steel staircase hang wherein a permanent steel staircase on a basement floor is suspended from a preceding work floor, and the permanent steel staircase is inserted downward at any time according to the progress of root cutting. Down construction method.