JPS6073916A - Construction method for underground floor - Google Patents

Abstract

PURPOSE:To perform efficient building of an underground floor and to place concrete without the use of a construction joint at the underground floor, by a method wherein a structure center pillar having guide rails is erected in a hole bored in a ground, and beam materials are slidably engaged with guide rails. CONSTITUTION:A structure cetner pillar 3 having guide rails 6 is erected in a hole bored in a ground. After a second floor beam material 7 is secured to the portion, projecting from a ground, of the structure center pillar 3, beam materials (a) and (b) are slidably engaged with the guide rails 6, the adjoining beam materials (a) and (b) at the same floor are coupled together by means of an angle brace material 8, and floor plates are placed thereon to assemble a floor slab material. After the already-assembled floor slab for an underlaying floor is lowered along the guide rails 6, a next floor slab material is assembled. Further, after the floor slab materials for from a lowermost floor to a first floor are temporarily secured, in order, in a staged manner, the floor slab materials are secured to the structure center pillar 3, in order, from the floor slab material for an upper floor, and concrete is placed, in order, from an upper floor to a lower floor.

Description

[Detailed description of the invention] The present invention relates to a construction method for a basement floor.

Compared to the conventional reverse construction method and the normal basement floor construction method, this method had the disadvantage of increasing the construction period, especially for the basement floor. There are three main reasons for this:

0) After constructing the 1wisp including beams, the basement floor is constructed. As a result, most of the construction work for the basement floor was done underground below the first floor slab, and the loading, unloading, and importing of materials had to be complicated. A joining part shall be provided between 0M and 1.5M. Therefore, a lot of time and effort was spent on assembling the formwork and reinforcing bars in this area, and on water-stopping treatments.

[U] Concrete was poured and a curing period was allowed until the specified concrete strength was reached. After that, the excavation work at the bottom of that floor had to be restarted, which wasted construction time.

In view of the above-mentioned drawbacks, the present invention enables the construction of a basement floor much more easily and efficiently than the conventional reverse construction method.

In addition to shortening the construction period, the objective is to provide a construction method for basement floors that allows concrete to be poured at one time between the upper end of the construction floor slab and the lower end of the floor slab immediately above, without creating a joint. O According to the present invention, this purpose is to erect a structural pillar with a kite rail in an underground hole, and fix the frame beam material to the above-ground protrusion of the opposing drawing pillar. After that, the beams are slid onto the guide rails to connect the orthogonal and adjacent beams on the same floor, and the floor plates are installed on top of them to assemble the floor slabs and the ground excavation work progresses. Therefore, after lowering the already assembled floor slabs on the lower floor along the guide rails, we assembled the floor slabs on the relevant floor and fixed the floor slabs from the lowest floor to the first floor to the structural pillars. The floor slabs on the upper floors are fixed to the structural pillars in sequence, and the concrete is suspended or temporarily fixed in stages from the upper floors to the lower floors. This is achieved by pouring.

An embodiment of the present invention will be described in detail below.

In FIG. 1, the retaining wall material 11 has been installed in advance, and the structural pillars are erected and the second floor beam materials are constructed according to the following work procedure (4).

(1), holes 2 of a predetermined depth each drilled at a predetermined location
A structural pillar 3 of a predetermined length is inserted into the hole and temporarily fixed on the ground using a temporary fixing jig 4. In this state, concrete is poured into each excavated hole 2 to secure the lower end of each structural pillar 3. Fix it.

In this example, as the structural pillar 3, a square pipe-shaped pillar material is used, as shown in FIG. 7, and the inside thereof is filled with concrete 5'.

On each side of the structure pillar 3, two guide rails 6.6 are provided extending in parallel over almost the entire length thereof.

(2) As shown in FIG. 1.7, a pair of second-story beams 7, 7 are fixed in parallel to the above-ground protruding parts of the facing pillars 3.3.

At this time, notches 6', 6' are formed at the upper end of the guide rail 6.6, and the edge of the second floor beam 7.7 is welded to the side surface of the structural column 3. The distance between the two second floor beams 7, 7 (inner dimensions) must be the same as the distance between the guide rails 6.6, and the inner surface of the guide rail 6.6 and the inner surface of the second floor beams 7, 7. It is desirable to keep it smooth.

In addition, fixing the second floor beams 7, 7 to the structural pillars 3 in this way is important for functionality (in particular, workability and safety during the sliding work of beam materials, which will be described later), and In order to achieve both of the above two requirements, as well as to improve the positioning of the structural column head and horizontal rigidity, it is most preferable to use miso section steel for the 2VA beam material. Other shaped steels such as

(3) Remove the temporary fixing jig 4.

In this way, the upper ends of the structural pillars 3.3 facing each other are held at a constant distance by the 2VA beams 7, 7, and after this, the beams are attached in the following order (4) to (a). Performs sliding and lowering, connecting and assembling beams, lifting and lowering them, and concrete pouring work.

In this example, for all beams from the bottom floor to the first floor, H-shaped fl11 is used for the beam a adjacent to the load-bearing wall, and the other beams are For the timber,
Two miso-shaped N b1* by filler plate b,
It is assumed that composite beams are used that are separably bolted together.

(4) Start excavation work, and from the place excavated to a predetermined depth, as shown in Figure 2, while suspending beams a and b on the ground with a crane etc., The upper end is slidably fitted onto the guide rails 6, 6 of No. 3, and is lowered along these guide rails 6, 6 to pass between the pair of beam members 7, 70 of No. 2.

(5) Among the beams @'a and b that have been slid together and are mutually orthogonal and adjacent to each other, the beams are firmly connected by flint 8 and assembled in a lattice shape.

(6), install the m@ floor plate 91 on the lattice beam (hereinafter referred to as floor slab material), and as shown in Fig. 7.8,
Sliding auxiliary plates 9, 9 that are in sliding contact with the outer surfaces of the guide rails 6.6 are bolted to the ends of a and b to create the floor slab material B for the lowest floor (in this example, the third basement floor). For example, use the chain 10' of the chain block 10 to connect the 2i beam 7.
Temporarily hang it on the lower blade.

(After further excavation work, as shown in Figure 3)
Above (4) to () above the bottom floor slab material B,
Assemble the floor slab material B for the second basement floor using the same procedure as in step 6), suspend it below the second floor beam material 7 using the chain 10' of the chain block 10, and use the jig 11 for temporary support. Temporarily fix it to the true pillar 3. That is, as shown in Figure 7,
For the temporary support, the jig 11 is attached to the guide rail 6.6 using bolts, and the beam material a or b is mounted on the jig 11 and temporarily fixed with bolts. After that, the chain block 10 was replaced, and the floor slab material B for the lowest floor was installed in the basement 2.
It is suspended below the floor slab material B.

The purpose of temporarily fixing the beams a and b is to prevent the movement of the two tank pillars 3 and 3 in the frame together with the second floor beams 7 and 7 that have already been fixed to the frame as described above. This is to prevent twisting or unraveling in the middle portion.

+81. Assemble the floor slab materials B and / for the bottom floor in the same way as above at the place where the TiA contacts, and use jig 1 to temporarily hold the beam materials.
Temporarily fix at 1. In addition, the floor slab materials B, and B, / are assembled separately by separating the composite beam materials b8 and .

(9) First-stage backing material 12 between the retaining wall material 1 and the structural pillar 3. and stones for installing struts 131.

0), operate the chain block 10 to lower the floor slab material B3 for the lowest floor to a predetermined position along the guide rail 6.6.

al), as shown in Fig. 4, the bottom floor river bed slab material B, t-
The temporary support is temporarily fixed in a predetermined position with a jig 11, and a second stage holding material 12. and strut material 13. Install a part of the

(1:!1. Assemble the floor slab material B1 for the first basement floor, and temporarily fix the temporary support in the predetermined position using the jig 11.

G31. Temporarily hold the floor slab material B for the second basement floor using a jig.
After removing several parts, lower it to the specified position.

Assemble the floor slab material Bf for the second basement floor in a place with zero leakage and shielding, and temporarily hold it with the specified grain +! using jig 11. 'Ij:
After temporarily fixing the floor slab material for the bottom floor Bi'k 7151
Lower it to the fixed position.

051, As the excavation work progresses, the bottom floor riverbed slab material B
□ Floor slab for basement 2nd floor Bx-basement 1v? The above-mentioned lowering and temporary fixing of the floor slab material B are carried out in sequence, and the first floor floor slab material F (Fig. 5) is assembled, and the third stage raising material 12. and install 13□ struts. In the same way, the floor slab material for underground IWJ and 1.
Assemble floor slab material FI.

Qo, the second floor slab concrete 14 is poured from Bi when the sliding joint of the first floor beams is completed.

(L?)-19'R The first floor 1st floor timbers F and F? have reached the fixed frame position. After the beams a and b (b and b1 are bolted again) are welded and fixed to the structural pillars 3, slab concrete 15 is placed on these floor slabs FleF8.

During this time, the floor slab materials on the lower floors will be temporarily fixed and lowered according to the first shift described above.

081, 7) Floor slab for the first basement floor @B, which has reached r constant frame phase flaw 9.

For BE, perform the same work as for the first floor.

Ql, the concrete strength of the slab concrete 15 crab FFt has been reached. Beam 17. Assemble the reinforcing bars and formwork for the load-bearing wall 18, and pour the concrete through the through holes provided in the predetermined positions of the slab on the 1st floor.
,, Do the same work as above in l■ of B4. On the bottom floor, set beams a and b to 1? ll Concreting the temporary load-bearing plate 19 welded to the true pillar 3, then the column, load-bearing wall, and beam.

0 or more through holes for pouring slab concrete, beams assembled in a grid pattern (floor slab material)
The earth pressure was supported by temporary fixation, and the excavation continued.
After lowering the floor slab material to the specified position, concrete for the footing area can be poured without interrupting the excavation work.
It is possible to construct a basement floor that does not require complicated joints.

In this example, square shaped pillars are used as the structural pillars 3, and the concrete 5' is filled inside them because the overall planar dimension of the slab (approximately Assuming a case where the beams are the same (equal), the beams are made of A, BT and 1 (multiple lattice sets) for each floor, and the upper and lower stairs are lowered differentially and fixed by welding on each floor. As a result, the construction of the earth cc at 9th construction was completed.
hi, I material on the lower floor [K There is a step. For this reason, it is taken into consideration that the S true pillar 3 is required to have bending strength and shear strength.

In addition, if the overall planar dimensions of the slab are small, beam materials a,
Construction is also possible by connecting one set of b (one lattice set). In this case, for safety reasons, it is desirable to temporarily suspend the excavation work (the time required is extremely short compared to conventional construction methods) when lowering the floor slab material on the lowest floor.

In addition, the method of attaching sliding auxiliary plates 9.910 to the ends of beams a and b and lowering the lattice beams (floor slabs) completely is because the lattice beams on the floors directly above and below are Even though the temporary support is temporarily fixed to the structural pillar 3 using the jig 11 and the structural pillar 3 is restrained, the temporary support is in a state where earth pressure is transmitted (bending or distortion occurs in the structural pillar). When the lattice beam is lowered, the end face of the beam and the side surface of the structural column will rub against each other, making the surface condition of the welding groove poor. This is to avoid direct contact between the end face of the beam material and the side surface of the structural column by sliding the ends together.

In addition, the beams that form the joints between the lattice beams have two grooves bisb! The reason why we adopted the form of a composite beam material that is separably bolted together via a filler plate bs is that when earth pressure is being transmitted, the separated miso-shaped mbtmbt collide and slide against each other when descending. 10,000 to avoid deterioration in work efficiency, when joining after reaching the specified frame position, it facilitates the joining work (especially the work of sandwiching the filler grates), and furthermore, after joining, the specified performance as a structure can be obtained. This is because we have taken everything into consideration.

In addition, the reason why we used a floor slab with Jun-made floor plates 9 installed on the lattice beams was to ensure a safe working floor and a protective ceiling when viewed from the lower floor (including the excavation surface). Yes, and it also fixes the floor slab material in place, making it easy to place and place slab concrete.
This is to create a supporting floor that can support the weight of the concrete beams on the upper floors after hardening. If the allowable compressive stress in the axial direction of the lattice beams is insufficient for Tonosho, precast concrete floor plates may be used instead of copper floor plates, or precast concrete may be used to cover designated areas of the periphery with concrete. By using beams, it is possible to cope with greater earth pressure, and there are fewer places to pour concrete, which further shortens the construction period.

The effects of the construction method of the present invention are listed below.

■ Because the floor slab material or lattice beam material serves as the strut material, the strut material that penetrates into the basement floor in conventional construction methods is no longer required, reducing temporary construction costs associated with installation and dismantling. Construction period can be shortened.

■ Concrete can be placed between the top end of the construction floor slab and the bottom end of the floor slab directly above it at once, and the area below each beam (approximately 1.0M
-15M) can be used to reduce the amount of work required and shorten the construction period.

■ After pouring concrete for each floor slab and reaching the specified concrete strength, reinforcement for beams, columns 1, load-bearing walls, and formwork can be assembled. #1 similarly simplifies the construction of pears, beams, and load-bearing walls, and moreover, the concrete pouring work can be done directly through the through-hole provided in the upper floor slab, making the work easier. Improve safety, atit, and safety.

■ The floor slab material from the bottom floor to the first floor is lowered in steps,
P5: In order to secure the upper floors to the pillars in order from the upper floors that have reached the fixed frame position, (a) Reinforcement and formwork assembly work for beams, columns, and load-bearing walls, ←) Temporary fixing of floor slab materials, The three-second work of lowering, anchoring work, and (c) excavation work can be performed simultaneously and safely in parallel (because the floor slab material is involved, there will be no overlap between upper and lower operations), and it may be possible to Since the assembly work of the materials can be carried out above ground, the work for the three glazes mentioned above does not overlap with the flow line, making it possible to significantly shorten the overall construction period for the basement floor construction.

[Brief explanation of drawings]

1 to 6 are explanatory diagrams showing the construction order of an embodiment of the present invention, and FIGS. 7 and 8 are a perspective view and a plan view showing the relationship between the structural pillar and the beam material. 6... Guide rail, 3... Structure pillar, 2... Excavation hole, 7... Second floor beam material, a, b... Beam material, 9... Floor plate, B□Bt e B1 e R# 瀉+ B! l BI
sF? ...Floorplate @0 Patent Applicant Maza Co., Ltd. Agent Patent Attorney Hara 1) Shin F” Coco 5 111 Procedural Amendment November 8, 1980 Commissioner of the Japan Patent Office Manabu Shiga 1, Special indication of the case Application No. 58-145667 2, Name of the invention Construction method for underground floors 3, Relationship with the case of the person making the amendment Patent applicant Co., Ltd. Hazama Gumi 4, Agent ■ 105 Shinbashi-18-11, Minato-ku, Tokyo - Matsu Building Co., Ltd. 6, Detailed description of the invention in the specification subject to amendment. !11 Amend "guide rail" in line 9 of page 6 of the specification to "guide rail." (2) "F2" on page 9, line 10 of the same book is corrected to rFl'J.

Claims (1)

[Claims] L: After installing a structural column with a guide rail in the underground excavation hole and fixing the second-floor beam material to the above-ground protrusion of the opposing tank main column, the beam material is slid onto the guide rail. Then, the orthogonal and adjacent beams on the same floor are connected to each other, and floor plates are installed on top of them to assemble the floor slabs.As the ground excavation work progresses, the floor slabs of the already assembled lower floors are After lowering the floor slabs along the guide rails, the floor slabs for the relevant floors are assembled, and the floor slabs from the lowest floor to the 91st floor are suspended or temporarily fixed in stages without being fixed to the structural pillars. A construction method for a basement floor, which is characterized in that concrete is poured sequentially from the floor slab material of the upper floor that has reached a predetermined frame position to the structural column Kb'J, and then from the upper floor to the lower floor.