JPH028102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a basement floor beam for constructing a basement floor beam on a structural pillar.

Conventionally, there is a reverse construction method as one of the construction methods for underground floors.

This construction method has the advantage of being able to construct the above-ground and underground parts of a building in parallel, but it has the following drawbacks.

(b) After constructing the first floor, the construction work for the basement floor is done underground in a nearly sealed area, so work efficiency is poor.Especially when the basement floor is made of SRC construction, the steel beam materials for the basement floor are After being lowered with a crane or the like through a temporary opening in the first floor and then pulled horizontally, it had to be fixed to the designated structural pillars, and the construction work of the slabs, beams, and columns on the basement floor was complicated. I had no choice but to do so.

(b) At approximately half of the floor height (from 1m above the beam)
Because a joint is created at the bottom of the 1.5 m (1.5 m) part, a complicated formwork with a pouring part is required for that part, and non-shrinking mortar is injected to stop water, which requires a lot of time and effort. I was wasting my time.

For these reasons, conventional underground floor construction work has been a major obstacle to shortening the construction period and reducing construction costs.

The purpose of the present invention is to make it possible to construct basement floor beams much more easily and efficiently than the conventional reverse construction method, to shorten the construction period and cost of the entire basement floor, and to improve the structure of the construction floor slab. To provide a method for constructing a basement floor beam material, which allows concrete to be placed between the upper end and the lower end of a slab directly above the floor at one time.

The present invention uses a structural pillar provided with a guide rail that guides the beam downward, and first installs the structural pillar in an underground hole, and connects the above-mentioned guide rail between the ground protrusions of both opposing structural pillars. After fixing the second floor beams to the frame in places where they do not interfere with the sliding guides, keeping the true pillars of both structures at a specified distance, and excavating to the required depth, the beams and beams for all basement floors are The first floor beams are sequentially lowered from the lower floor along the guide rail on the ground, and suspended or temporarily fixed in steps without being fixed between the two structural pillars.

Next, from where the excavation work has progressed, all the underground floor beams and the first floor beams are lowered along the same guide rails, suspended or temporarily fixed between the structure pillars, and the first floor beams are removed. After fixing the materials to the main pillars of both structures, in the same way as above, as the excavation work progresses, the beams are lowered, suspended, or temporarily fixed repeatedly, and the beams on all basement floors are sequentially installed starting from those on the upper floors. It will be fixed to the main pillars of both structures, and will eventually construct the frame of the entire basement floor.

An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in Fig. 1, this example is suitable for cases where the heaping wall material 1 has the strength to withstand earth pressure and can stand on its own, or when the earth anchor construction method is used and no heaping support material (particularly struts) is required. In this example, we assume the following case.
Erect the structural pillars in the order of (1) to (4) and construct the beams for the second floor.

(1) Insert a structural pillar 3 of a predetermined length into a hole 2 of a predetermined depth excavated at a predetermined position and temporarily fix it on the ground with a temporary fixing jig 4. In this state, each hole 2 Concrete 5 is placed inside to fix the lower end of each structural pillar 3.

In this example, a square pipe-shaped pillar material is used as the structural pillar 3, as shown in FIG. 5, but a round pipe-shaped pillar material, a cross-shaped pillar material, etc. may also be used.

On each side of the structural pillar 3, two guide rails 6, 6 are protruded in parallel over almost the entire length thereof.

(2) Between the above-ground protruding parts of the two opposing structure pillars 3, 3, as shown in Figures 1, 5, and 6, one pair is installed at a location that does not interfere with the sliding guide part between the guide rails 6, 6. The second floor beams 7, 7 are fixed to the frame in parallel.

At this time, notches 6', 6' (Fig. 6) are formed at the upper ends of the guide rails 6, 6, and the edges of the second floor beams 7, 7 are formed at these notches 6', 6'. Welded to the sides of the structural pillars 3, both second floor beams 7,
It is desirable that the interval (inner dimension) between the guide rails 7 and 7 be approximately equal to the interval between the guide rails 6, 6.

In addition, by fixing the second floor beams 7, 7 to the structural pillars 3, 3 in this way, it is possible to improve functionality (in particular, it can also be used as a slab formwork to ensure ease and safety when sliding the beams together). This is to improve the installation of steel floor plates), and it is most desirable to use groove-shaped steel for the second floor beam material, but other shaped steel such as I-beams, H-beams, and L-beams may also be used. Good too.

(3) Remove temporary fixing jig 4.

Thus, the upper ends of the structural pillars 3, 3 facing each other are held at a constant distance by the second floor beams 7, 7, and then, as shown in FIG. 8. Place the beams 9 for the second basement floor, the beams 10 for the first basement floor, and the beams 11 for the first floor between the two main pillars 3, 3, and move the first floor beams 11 to the following (4) to (7). It is fixed to both structure pillars 3 and 3 in sequence.

(4) Start the excavation work, and from the place excavated to a predetermined depth, first, while suspending both ends of the underground beam 8 on the ground with a crane 12 etc., remove the guide rails of the main pillars 3, 3 of both structures. 6, 6 from the upper end, and lower along these guide rails 6, 6 to pass between a pair of second floor beam members 7, 7 as shown in Fig. 6. . Similarly, the second basement floor beam 9, the first basement floor beam 10, and the first floor beam 11 are passed through in sequence, and these four beams 8
- 11 are suspended below the second floor beam 7 by chains 13' of chain blocks 13, for example, in the form of a blind.

(5) After the excavation work has progressed further, operate the top chain blocks 13 and 13 to remove the first floor beam 1.
1 is lowered along guide rails 6, 6 to a predetermined frame position. Underground beam materials 8 to 10 are 1
As the floor beam material 11 descends, it also descends simultaneously along the guide rails 6, 6.

(6) Temporarily hold both ends of the underground beam material 8 with jigs 14, 14.
Temporarily fix it in the middle of the main pillars 3, 3 of both structures.
That is, as shown in FIG. 7, the temporary receiving jig 1
4 is attached to the guide rails 6, 6 using bolts 15, and the underground beam material 8 is mounted on this temporary receiving jig 14 and temporarily fixed to the temporary receiving jig 14 with bolts 16.

In addition, temporarily fixing the underground beams 8 midway between the true pillars 3, 3 of both structures, together with the second floor beams 7, 7, which have already been fixed to the structure as described above, This is to restrain the movement of the structural pillars 3, 3 relative to each other and to prevent twisting or warping at the midway portions of both the structural pillars 3, 3.

(7) Position the first floor beam material 11 at a predetermined frame position and weld both ends to both structure pillars 3, 3. At this time, as shown in FIG. 8, both sides of the flange portion 11a of the first floor beam 11
After welding the inner surface of the structural column 3, the side surface of the structural column 3 is welded to the end face of the flange portion 11a and the end face of the web portion 11b of the first floor beam material 11, thereby preventing twisting or warping of the structural column 3 due to welding distortion. It can be reduced as much as possible.

In addition, if the second floor concrete slab 17 is cast from the place where the beams 8 to 11 have been inserted, it can be used as the standard working floor for the ground floor, so the flow lines for the ground floor and basement floor are separated. construction work on the ground floor can be carried out safely.
Moreover, since the surface rigidity of the second floor slab surface can be improved, the structural pillar 3 can be held at the top position more accurately and firmly.

After fixing the first floor beams 11 to the frame as described above, as shown in FIG. After pouring the floor slab concrete 18 and further excavating, the beams 8 to 10 are lowered, the underground beams 8 are temporarily fixed in the same manner as above, and the underground first floor beams 1
0 to both structural pillars 3, 3. Next, a predetermined formwork for a slab is installed on the beam material 10 for the first basement floor, and the slab concrete 19 for the first basement floor is poured. Underground 2
Regarding the floor beam material 9, the same work as above is performed.

In addition, after installing the slab formwork, the work floor (slab) can be formed by placing slab reinforcing bars and pouring concrete, so it is necessary to install the beam formwork and column formwork at the same time as the slab formwork. Compared to the conventional reverse construction method, in which the lower part of the shoring is an excavated surface, the formwork assembly work is simplified and the construction period can be shortened.

After pouring slab concrete as described above and reaching the specified concrete strength, as shown in Figure 4, formwork for the columns 20, beams 21, and load-bearing walls 22 is assembled, and the concrete is placed in the specified position on the slab on the floor immediately above. Pour concrete through the through-holes provided in the building and place concrete for columns, beams, and load-bearing walls.

On the lowest floor, after welding the underground beam material 8 to both structural pillars 3, 3, concrete for the pressure board 23 is poured. Next, concrete is placed for the columns 20, load-bearing walls 22, beams 21, and slabs 24.

Concrete pouring for columns, beams, and load-bearing walls is done by pouring concrete through through holes provided in the floor slab directly above, making concrete pouring work extremely easy and safe. Since there is no joint between the upper end and the lower end of the floor slab directly above, water stoppage treatment is very easy.

In addition, in the embodiment described above, the ends of the beam members 11 (or 8, 9, 10) are slidably fitted between the two guide rails 16, 16 provided on each side of the structural pillar 3,
Although we assumed the case of lowering the beam, if one guide rail 16 is provided on each side of the structural pillar 3 as shown in FIG.
A slit 25 is provided at the end of 0), and the slit 25 is slid onto the guide rail 16 to lower the beam. In this case, in order to fix the beam to the structural pillar 3, as shown in FIG.
The flange portion 11a of the beam material 11 (or 8, 9, 10) is clamped by 6 and bolted together.
The end face of the structure pillar 3 and the side surface of the structural pillar 3 are welded.

As detailed above, according to the present invention, the beams on the first floor and all basement floors are lowered along the guide rails of the main columns of both structures, and the beams of the upper floors are sequentially placed on the main columns of both structures. Since it is firmly fixed, the work of constructing beams can be done easily and efficiently. Also, work safety is high.

[Brief explanation of drawings]

Figures 1 to 4 are explanatory diagrams showing the structural order of an embodiment of the present invention, Figures 5 and 6 are perspective views and partially cutaway side views showing the relationship between the structural pillars and second floor beams, and Figures 7 The figure is a perspective view showing the temporarily fixed state of underground beams, Fig. 8 is a horizontal sectional view showing the fixed state of first floor beams, Figs. 9 and 10 show other examples, and Fig. 9 is a guide rail. FIG. 10 is a horizontal sectional view showing the relationship between the beam material and the beam material, and FIG. 10 is a horizontal sectional view showing the fixed state of the beam material. 16... Guide rail, 3... Structure pillar, 2...
Hole, 7...2nd floor beam material, 8...underground beam material, 9...2nd basement floor beam material, 10...1st basement floor beam material, 11...1
Floor beam material.

Claims (1)

[Claims] 1. A structure pillar equipped with a guide rail is installed in an underground hole, and second-floor beams are installed at the above-ground protruding parts of both opposing structure pillars that do not interfere with the sliding guide part of the guide rail. After the frame is fixed and the excavation work on the ground between the two main pillars has progressed, the beams of all the basement floors and the beams of the first floor are sequentially slid onto the sliding guide part of the guide rail, starting from the one on the lower floor. Then, as the excavation work progresses, the beams and beams of all the basement floors are suspended and temporarily fixed at different levels without being stuck between the main pillars of both structures. After lowering the first floor beams along the same guide rails and suspending them or temporarily fixing some of the beams without sticking them between the true columns of both structures, the first floor beams reached the predetermined frame position. The frame was fixed to the main pillars of both structures, and then excavation work, lowering of the beams, suspension of the beams, and temporary fixing of some beams were repeated in sequence, and the beams of the upper floors were fixed in place in order. A construction method for underground floor beams that is characterized by: