JP3138129B2 - Reverse beam construction method and driving beam side formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a reverse hitting beam in which backfilling is omitted in a reverse hitting method and a driving beam side formwork used in the reverse hitting method.

[0002]

2. Description of the Related Art A reverse striking method for sequentially constructing an underground skeleton by repeating a root cut and a skeleton construction toward an underground after constructing a sill and a timber pillar is already well known. This method is excellent in that it allows not only early construction of the underground skeleton but also simultaneous construction of the above-ground skeleton, and it is currently being actively carried out.

[0003]

In this method, after assembling a beam and slab formwork under a beam bottom and a slab at a root incision, the remaining excavation space is temporarily backfilled and the backfill soil is used. Since each formwork is supported, the shoring work can be simplified.
However, in order to support the assembled formwork despite the removal at the next root cutting, it is necessary to temporarily refill the remaining excavation space, which is a waste of time and labor, and sometimes, Inadequate backfilling can cause rework. Therefore, the invention of the method for constructing a reverse hitting beam according to the first aspect of the present invention is to cast a discarded concrete to be removed at the time of the next root cutting, use this as a formwork under the beam bottom and under the slab, and It is an object of the present invention to solve the above-mentioned problem by using a driving beam-side mold formed in advance with an inorganic fiber-mixed cement for the side forming frame. It is an object of the present invention to provide an easy-to-use one suitable for the method of constructing a reverse beam.

[0004]

Means for Solving the Problems In order to achieve the above object, the invention of a method for constructing a reverse hitting beam according to claim 1 is directed to a reverse hitting method,
The root of the incision is the part of the beam and column to be constructed.
Formed one level deeper, and straightens each part corresponding to beams, columns and slabs.
And Da設concrete discarded down the beams bottom discarded longitudinal sectional circle serving inorganic fiber cement molded plate upper end comes warp between the outer edge of the slab under abandoned concrete corresponding to the inner edge and the inner edge of the concrete An arc-shaped driving beam-side formwork is erected, and after the specified strength is achieved in the concrete cast on the concrete at the bottom of the beam and the concrete at the bottom of the slab,
Make the next root cut in the ground part surrounded by the concrete ,
At that time, it is characterized in that the concrete dumped at the bottom of the beam and the concrete dumped at the slab are removed.

Further, according to the invention of a driving beam side formwork of the present invention, a plate having an arcuate vertical cross section with a warped upper end, a rib on a peripheral edge and a rib on a lower end surface are formed by cement mixed with inorganic fiber. It is characterized in that it has an engaging groove, a cap nut is driven into an appropriate position of the rib on the warped upper surface, and is formed into a series of formable arrangements.

[0006]

With the above construction, according to the invention of the method for constructing a reverse beam according to the first aspect of the present invention, the concrete discarded by the beam bottom and the concrete discarded by the slab not only function as the beam bottom formwork and the slab bottom formwork, In the next excavation, it is possible to remove the excavated soil together with the excavated soil, and the driving beam side formwork eliminates the need for backfilling of the excavated space, and is integrated with the concrete after placing the concrete. , Allowing it to be left as it is. Therefore, each discarded concrete and driving beam side formwork eliminates the need to dismantle the formwork after the next root cutting as in the past, and makes use of wood unnecessary, except for a very small number that is used as an auxiliary. I do.

Further, in the driving beam-side mold according to the second aspect of the present invention, the shape of the arcuate vertical cross section whose upper end is warped converts the bending stress originally generated in the side mold into a compressive stress, thereby changing the shape of the mold. Retains its shape, combined with the strength due to the properties of the ribs and the material, exerts a high yield strength, and its form allows for easy and strong assembly to concrete at the bottom of the beam and concrete at the bottom of the slab. The engagement groove on the end surface allows the mounting flexibility with the mounting hardware, and the driven cap nut enables easy and strong support by a non-opening separator or the like. Therefore, it is possible to use the above-described claim 1 in the reverse hitting beam method without any trouble.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment according to the first and second aspects of the present invention. Hereinafter, the illustrated reverse beam construction method and the driving beam side formwork will be sequentially described according to the procedure of the construction.

(1) In view of the reverse striking method, a timber pillar (not shown) is driven into the ground, and a peripheral retaining wall 1 (FIG. 1) is constructed. At this time, the root incision 2 (FIGS. 3 and 4) forms the beam A and the column B to be constructed in a groove shape one step deeper than the slab C and slightly wider than the beam width. -Excavation just below the parts corresponding to the pillars and the slab will be carried out so as to be suitable for placing the concrete 3 and the concrete 4 in the next step. The lower peripheral edge of the slab of the root incision 2 is made slightly lower (FIGS. 3 and 4).

(2) Casting concrete 3 and slab dumping concrete 4 on the root cut bottom 2 (FIG. 3,
(Fig. 4). At this time, an appropriate dam plate (not shown) is disposed at the end of the discarded concrete to appropriately stop the concrete and secure a predetermined horizontal level. In addition, a wooden frame (not shown) for removing discarded concrete is arranged at the outer edge of the slab lowering concrete 4 so that the outer edge is depressed.
Is screwed into the cap nut 6 (FIGS. 3 and 4).

(3) After the required strength is developed in the concrete dumped in the beam bottom 3, the inner edge of the concrete dumped in the beam bottom is
The blackening corresponding to the lower part of the driving beam side formwork 8 to be incorporated later and the beam position are performed, the steel beam 9 is erected, and the beam rebar 10
Arrange the bars.

(4) A beam bottom cutting material 11 such as a synthetic resin sheet and a slab lower edge cutting material 12 are laid on the beam bottom concrete 3 and the slab dump concrete 4 (FIGS. 3 and 4). Hole-in anchors 13 are attached to the inner edge of the beam-bottomed concrete 3 at required places in accordance with the above-described stamping-in for the beam-side formwork, and each hole-in anchor supports the fixing hardware 14 for the beam-side formwork. (FIGS. 3 and 4). And
The required pillar arrangement is provided (not shown). The hole-in anchor 13 is provided with a female screw anchor 15 to be fixed in a drilled hole provided in the beam-bottomed concrete 3, a bolt 16 screwed to the female screw anchor, and the fixing hardware 14 fixed to the bolt. It consists of a nut 17 and a washer 18 (FIG. 4). As shown in FIGS. 14 and 15, the fixing hardware 14 is made of a rectangular steel plate from the front edge of the horizontal mounting base 20 to fit into the engaging groove 19 of the driving beam-side formwork 8. A pair of engaging projections 21 and a supporting piece 22 that comes into contact with the lower end outer edge of the driving beam-side formwork 8 between the engaging projections are erected, and the mounting base 20 is attached to the hole-in anchor 13. A pair of left and right loose through holes 23 for attachment are formed.

(5) The required number of driving beam-side forms 8 are erected and arranged by adjusting the height of each of the level adjusting bolts 7 (FIG. 1). Most of the driving beam side formwork 8 is used for an intermediate portion of the beam A shown in FIGS. 5 to 10, but a part is for a corner shown in FIGS. These are inorganic fiber-mixed cement molded plates that are factory-produced in advance, all of which form a plate having an arcuate vertical cross section with a warped upper end, have ribs 24 on the periphery, and engaging grooves in the material length direction on the lower end surface.
19 with cap nuts 25 in place on the ribs on both sides of the warped top
And compression-molded into a series of formable arrangements. The inorganic fibers used for the inorganic fiber-containing cement molded plate may be existing fibers such as stainless steel fiber, steel fiber, carbon fiber, and glass fiber.For example, in the case of steel fiber, the length is 20 to 30 mm and the diameter is 0.5. It is mixed at a ratio of 0.5 to 2.0% by volume as a material of about mm. These driving beam-side formwork 8 has a lower end connected to the fixing hardware 14, that is, the engaging groove 19 at the lower end is engaged with the pair of engaging protrusions 21 of the fixing hardware, and the lower end outer edge is connected to the engaging groove 19 at the lower end. The supporting piece 22 of the fixing hardware is brought into contact with the supporting piece 22, and the lower surface of the warped upper end is placed on each of the level adjusting bolts 7. Thus, each level adjusting bolt 7 is finally adjusted, and each fixing hardware 14 is adjusted.
Is adjusted, and the nut 17 is tightened to fix. Next, L-shaped plate-to-plate joint hardware 26 is fixed to the cap nuts 25 of the respective ribs with bolts 27, and the non-opening separators 28 whose ends are welded to the steel beams 9 at the plate-to-plate joint hardware 26. Is fixed by tightening with a nut 29 (FIGS. 3 and 4). Further, the mortar 30 is filled in the recess 5 and the joint rod 31 is fixed to an inner corner portion between the mortar and the end face of each of the driving beam side molds 8 (FIGS. 3 and 4).

(6) After that, the concrete dropped into the slab 4
Slab reinforcement is provided (not shown) in the upper or driving beam side formwork 8, concrete of the beam A / column B and slab C is cast, hardened with a certain curing, and a predetermined When the strength develops, the next root cutting is performed.
At the time of this root cutting, except that each of the driving beam side form 8 to the opening stopper separator 30 is driven and left as it is, the concrete 3 for dumping the beam bottom, the concrete 4 for throwing down the slab, the beam bottom cutting material 11,
Slab lower edge cutting material 12, Cap nut 6, Level adjustment bolt 7,
Hole-in anchor 13, fixing hardware 17, mortar of depression 5
All 30 and joint bars 31 are removed (FIG. 2).

[0015]

According to the invention of the method for constructing a reverse hitting beam according to the first aspect of the present invention, in addition to the driving beam-side formwork, the beam-bottom concrete and the slab-downfill concrete function as the beam-bottom formwork and the slab-down formwork. since, the conventional wooden formwork is not required, and can be omitted the step backfilling backfill extra digging space for supporting a conventional manner assembled formwork, moreover, the beam bottom discarded con
At the same time as placing concrete on the cleat,
To cast concrete on concrete.
Come, it is possible to eliminate the waste of time and effort for that,
Rework resulting from insufficient backfill can be eliminated. Besides, not only the driving beam side formwork is left as it is, but also the concrete dumped at the bottom of the beam and the concrete dropped at the slab can be easily removed together with the cutting soil at the next cutting. The troublesome dismantling of the formwork can be eliminated. Therefore, the construction period can be shortened and the cost can be reduced. In addition, the surface has a finish equivalent to that of bare concrete, so that the quality can be improved and the design can be made more flexible. Further, since a wooden formwork is not required, the use of wood can be significantly reduced, and industrial waste can be reduced. In addition, the next pruning
To perform on the ground surrounded by cast concrete,
It can be unnecessary. Furthermore, driving beam side formwork
Is shaped like a vertical cross-section with a warped upper end.
The generated bending stress can be converted to compressive stress,
In addition to the strength due to the properties of the material, a large proof stress is exhibited
As a result, enormous strength can be obtained.
Easy to concrete and slab dump concrete?
A solid assembly becomes possible.

According to the second aspect of the present invention, the bending stress originally generated in the side form can be changed from the arcuate shape in the vertical section having the warped upper end to the compressive stress. In addition to the strength due to the characteristics of the ribs and the material, it exerts a large strength, so it can achieve tremendous strength, and its form can be easily and firmly assembled to concrete dumped in the bottom of the beam and concrete dropped in the slab. West,
In particular, the engagement groove on the lower end surface allows the mounting flexibility with mounting hardware, and the driven cap nut enables easy and strong support by the non-opening separator, etc., so it is suitable for the reverse beam construction method. It is possible to provide an easy-to-use and trouble-free one having a high yield strength.

[Brief description of the drawings]

FIG. 1 is a cut-away plan view showing an embodiment of the method for constructing a reverse beam according to the first aspect of the present invention during construction.

FIG. 2 is a longitudinal sectional side view showing a state after construction of the same example.

FIG. 3 is an enlarged longitudinal sectional side view of a main part of the same example, showing the main part in the middle of construction.

FIG. 4 is an enlarged longitudinal sectional side view of a main part showing a main part in FIG. 3 in a further enlarged manner.

FIG. 5 is a plan view showing an embodiment of a straight part formwork in the middle of a beam according to the invention of the driving beam side formwork of the second embodiment.

FIG. 6 is a front view of the same example.

FIG. 7 is a side view of the same example.

8 is a sectional view of the same example taken along line YY in FIG. 5;

FIG. 9 is an enlarged side view of a main part of the same example.

FIG. 10 is an enlarged sectional view of a main part of FIG. 7 XX line of the same example.

FIG. 11 is a plan view showing an embodiment of a corner corner formwork of the beam according to the invention of the driving beam side formwork of claim 2;

FIG. 12 is a front view of the same example.

FIG. 13 is a side view of the same example.

FIG. 14 is a side view of a fixing hardware for fixing the driving beam side formwork.

FIG. 15 is a plan view of the fixing hardware.

[Explanation of symbols]

A: Beam B: Column C: Slab 1 ... Retaining wall 2 ... Root cut bottom 3 ... Concrete thrown away from the bottom of the beam 4 ... Concrete thrown away from the slab 5 ... Hollow 6 ... Cap nut 7 ... Level adjustment bolt 8 ... Forming beam side formwork 9 ... Steel beam 10 ... Beam reinforcement 11 ... Beam bottom edge cutting material 12 ... Slab lower edge cutting material 13 ... Hole-in anchor 14 ... Fixed hardware 15 ... Female screw anchor 16 ... Bolt 17 ... Nut 18 ... Washer 19 ... Engagement groove 20 ... Mounting base 21 ... Engagement piece 22 ... Bearing piece 23 ... Through hole 24 ... Rib 25 ... Bucket nut 26 ... Plate joint hardware 27 ... Bolt 28 ... Opening separator 29 ... Nut 30 ... Mortar 31 ... Joint bar

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ichiro Tomura 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Masayuki Omata 8-21 Ginza, Chuo-ku, Tokyo No. 1 Takenaka Corporation Tokyo Main Store (72) Inventor Yasuyuki Shibata 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd. Takenaka Corporation Tokyo Main Store (56) References JP-A-5-140957 (JP, A) JP-A-5-59812 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 29/045-29/055

Claims (2)

(57) [Claims] 1. In the reverse driving method, the root incision should be constructed
Form the beam and column part one step deeper than the slab part,
Placing concrete discarded directly below each part corresponding to the beam, column and slab, and cementing the inorganic fiber mixed cement molded plate between the inner edge of the concrete discarded at the bottom of the beam and the outer edge of the concrete discarded at the slab corresponding to the inner edge A cast beam-side formwork with an arcuate vertical cross section with the upper end warped is erected, and after the predetermined strength has been achieved in the concrete cast on the beam bottom concrete and the slab dump concrete, the cast concrete Is surrounded
A reverse beam construction method characterized by performing the next root excavation on the ground part, and removing the concrete dumped at the bottom of the beam and the concrete dumped at the slab. 2. An inorganic fiber-mixed cement is used to form a plate having an arcuate vertical cross section with an upper end warped, and a rib on a peripheral edge,
A driving beam-side formwork having an engagement groove on a lower end surface, driving a cap nut into an appropriate position of a rib on a warped upper surface, and forming the same in a form capable of being arranged in a series.