JPH11140884A - Method for constructing footing beam, and support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an above-ground operation to increase the safety and efficiency of construction work by reducing surplus soil which is disposed of as industrial waste, and eliminating a foundation scaffold. SOLUTION: A bottom surface 18 which is narrower than that employed in conventional methods is excavated and graded (a). Supports 12 are placed (b) on the bottom surface 18 at predetermined intervals along the longitudinal direction of beams. The support 12 are obtained (b) by placing support columns 4 upright in parallel on a base material 1, providing fill 36 at each of the projecting ends of the base material 1, and locking a sheet pile iron plate 22 between the support columns 4 of the adjacent supports 12. The outside of the sheet pile iron plate 22 is backfilled, soil is graded, and blinding concrete 25 is placed (c). A reinforcing cage 29 for a footing beam is constructed within the sheet pile iron plate 22 and is held at its upper end against a horizontal member 10, and concrete is placed within the sheet pile iron plate 22 to construct a footing beam 30 and a slab 31.

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 foundation beam of a building and a support used for the method.

[0002]

2. Description of the Related Art Conventionally, when a foundation beam 30 is constructed, the following procedure has been performed (FIG. 12).

(1) The ground is excavated in accordance with the construction position of the foundation beam 30 to form an excavation recess 40, and the remaining soil is discharged. At this time, in consideration of the working space, D ₁ (at least 40) is provided on both sides of the width W ₀ of the foundation beam 30 to be constructed.
Drilling so as to form a bottom surface 41 of the drilling recess 40 in ~50cm about) widely width W ₁ (FIG. 12 (a)). Wherein D _1, upon construction of the foundation beam, temporary the ground anchorage 43 and the mold 45, when dismantling, was working on the essential length.

(2) Along with the foundation beam 30 to be constructed, a dumping concrete 42 is poured into the bottom surface 41 of the excavation recess 40, and a working scaffold 43 is constructed (FIG. 12).
(A)).

(3) Reinforcing bars are formed to form a predetermined reinforcing rod cage 29, disposed on the discarded concrete 42 in the excavation recess 41, and maintained at a predetermined height from the bottom surface. A block is interposed on the upper surface 42a of the waste concrete 42. Alternatively, instead of the block, or together with the block, a bar-shaped receiving member for holding the rebar basket 29 is erected.

[0006] (4) Subsequently, in accordance with the predetermined beam width W ₀ on both sides of the reinforcing bar cage 29, (usually plywood) mold plate by placing 44, sufficient withstand lateral pressure of concrete for pouring As shown in FIG. 12 (b), a mold 45 is constructed by tightening these together with a separator, a foam tie, a clamp or the like.

(5) Subsequently, concrete is poured into the formwork.

(6) The ground scaffold is dismantled and removed.

(7) The mold is dismantled and removed (FIG. 12)
(C)). In some cases, (6) and (7) were performed in a different order.

(8) The soil is buried around the foundation beam 30 in the excavation recess 40. At this time, soil was often brought in from outside.

(9) The backfilled soil between the beams is leveled, and a discarded concrete 47 for slab is poured (FIG. 12).
(D)).

(10) A slab rebar is constructed above the waste concrete 47, and concrete for the slab is cast to construct a slab 48.

[0013]

In the above-mentioned prior art, the ground around the foundation beam is widely excavated for work such as construction of a ground scaffold, so that there is a problem that digging and backfilling work is increased. Furthermore, there is no place to store the excavated soil at the narrow construction site, and it is discharged outside (treated as industrial waste). At the time of backfilling, the soil is further carried in for backfilling (usually separately. Purchase) was required.

Also, the loading and assembling work of the reinforcing bars and the formwork for the beam is performed on the ground scaffolding, so that it is unstable and the working efficiency is poor. Further, since the formwork and the scaffold cannot be removed until after the strength of the concrete is developed, there is a problem that the shortening of the construction period is hindered.

[0015]

However, the present invention has solved the above-mentioned problems by using a support capable of holding a reinforcing bar cage and locking a discarding formwork between the supports.

That is, according to the present invention, a bottom is cut off according to a foundation beam to be constructed, the bottom is leveled, and a discarded form plate is formed on the bottom at predetermined intervals along a beam construction position. A support for supporting the earth pressure is placed, and a discarded formwork plate for a foundation beam serving as a sheet pile for mountain retaining is erected between the supports, and excavated soil is placed outside the discarded formwork plate. Backfilling, constructing a reinforced cage for the foundation beam in the discarded form plate, holding the upper part of the reinforced cage in the support, and casting concrete into the discarded form plate to construct the foundation beam It is a method of constructing a foundation beam characterized by performing.

Further, in the above, after the excavated soil is back-filled to the outside of the waste form plate, the soil at the slab construction planned position is leveled, and slab waste concrete is poured.
In the discarded form plate, a reinforcing bar for a foundation beam is constructed, the upper part of the reinforcing bar is held by a support, and the foundation beam and the foundation slab are disposed in the discarding form and on the upper surface of the discarded concrete for the slab. This is a method for constructing a foundation beam, which comprises constructing a foundation beam by casting concrete.

Further, the present invention is a support for holding a reinforcing bar and a formwork when constructing a concrete foundation beam, and the support is cut off corresponding to the width direction of the foundation beam to be constructed. On the base material that can be placed on the bottom surface of the concave portion, support columns that can lock the side edges of the discarded form plate are erected in parallel at intervals corresponding to the width of the foundation beam, and the upper ends of both support columns A supporting member for holding a supporting column. Further, in the above, both end portions of the base material are projected outward from the support pillar to a length of "1/8" to "1/5" of the beam of the foundation beam to be constructed. Support.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS On a base material arranged in the width direction of a foundation beam to be constructed, support pillars capable of locking the side edges of the discarded form plate are arranged in parallel at intervals corresponding to the width of the foundation beam. Set up. Both ends of the base material are projected outward from the support columns for a length of "1/8" to "1/5" of the beam of the foundation beam to be constructed.
At the upper end of both support columns, a horizontal member holding the support columns is provided to form a support.

The bottom is cut off according to the foundation beam to be constructed, the bottom is leveled, and discarded concrete is poured. The support is placed on the discarded concrete at predetermined intervals along the beam construction planned position, and the embankment is filled on both ends of the base material of the support, and the discard form plate is placed between the support columns of the adjacent support. To stand upright. The excavated soil is back-filled outside the discarded formwork, the soil is leveled, and discarded concrete for the slab is cast.
Work on abandoned concrete, build a reinforced cage for the foundation beam in the abandoned formwork, and hold the upper part of the reinforced cage on the support. The foundation beam is constructed by casting concrete into the discarded formwork.

[0021]

[Function] Since the discarded form plate can be locked to the support for holding the reinforcing cage, the foundation form can be held against the pressure of the soil and the concrete poured in. The soil that has been cut off can be backfilled outside the frame plate.

Since the discarding form plate can be locked to the support and the reinforcing bar cage can be held at a predetermined position in the discarding form plate, the installation space and working space for temporary objects such as ground scaffolds can be provided on the bottom of the root cutting. do not need.

[0023]

Embodiment 1 An embodiment of a support according to the present invention will be described with reference to FIG.

A base material 1 having a length L and a substantially H-shaped cross section, which is longer than the width W ₀ of the foundation beam to be constructed by about L ₁ (about 20 to 30 cm) on both sides, is disposed above and below the flanges 2 and 3. I do. On the substrate 1, at predetermined intervals to correspond to the beam width W _0, erected secure the two support pillars 4,4 of cross section H-shape. At this time, the webs 5 of the support columns 4 and 4 are placed in the width direction of the foundation beam (the
Along the length direction).

In the above description, L ₁ is usually set to “about ８” to “分 の” of the beam to be constructed. That is, for example, when the beam is 200 cm, it is about 15 to 40 cm. Preventing rotation of the support in the cross-sectional plane of the foundation beam,
In addition, it is for ensuring workability.

In the above, the substrate 1 and the support columns 4 are
Although the cross section is H-shaped, a cross section of a U-shaped cross section is usually used by bonding together so as to form an H-shape. They can also be combined (not shown).

The form plate is locked between the inner surfaces 8, 8 of the opposed flanges 6, 6 of the support columns 4, 4, and the inner surfaces 8 are respectively abutting surfaces 8. Accordingly, the distance between the inner surfaces 8, 8 of the flange is the beam width W _0. Further, in the substrate 1, both end portions 1a of the support column 4 projecting outwardly, 1a has a length L _1.

Between the upper ends 9, 9 of the support columns 4, 4, the support columns are held by earth pressure or the like, and a horizontal member 10 for holding the reinforcing bar cage is erected and fixed. Further, the upper flange 2 of the base material 1 is made to correspond to the contact surface 8 of the form plate of the support column 4,
Notches 11, 11 for locking the form plate are formed. In addition, since the main reinforcing bar at the upper end of the reinforcing bar cage is placed on the horizontal member 10, it is installed in accordance with the height of the main reinforcing bar at the upper end.

As described above, the support 12 of the present invention
(FIGS. 1A and 1B).

[0030] In the above, in the support tool which is used in a continuous manner at a position where the pillar is to be connected to the foundation beam, the form plate is arranged obliquely with respect to the form plate for the foundation beam. in this case,
The supporting column 4 of the supporting tool is made of C-shaped steel, and the locking rod 14 made of L-shaped steel is fixed to the supporting column 4 so as to be able to lock the formwork arranged obliquely.
(FIG. 4). When the form plate for the pillar is arranged at right angles to the form for the foundation beam, the locking rod 14 is fixed at a corresponding position (not shown).

In the above embodiment, the base material 1 and the support columns 4 have an H-shaped cross section.
Any other cross-sectional shape may be used as long as it can support the sheet metal 0 and lock the sheet metal plate 22.

[0032]

Embodiment 2 Next, the use of the support 12 of the present invention, that is, the method of constructing the foundation beam of the present invention will be described.

At the position where the foundation beam is to be constructed at the construction site, the beam width W _{2 is} wider than the beam width W ₀ by D ₂ (about 20 cm on one side), and the width W ₂
Excavation so that it becomes the bottom surface 18 of the excavation (root cutting)
17 is formed. Said D ₂ is dumping concrete,
Since the length at which ink can be extracted is sufficient, the width can be significantly reduced as compared with the related art. Accordingly, at this time, the amount of the remaining soil disposal is reduced to about one third of the conventional amount, and the backfill soil can be filled in the ground (planned slab position) 19 between the foundation beams.

The surroundings of the bottom surface 18 of the excavation concave portion are leveled with a width W ₂ , and if necessary, the concrete is divided, and then the discarded concrete 20 is poured (FIG. 2A).

[0035] The ink is marked out on the discarded concrete 20, the supports 12 and 15 are arranged, and the base material 1 is temporarily fixed with nails or the like.
At this time, the beam position and the contact surface 8 of the support columns 4 and 4 are arranged so as to correspond to each other. Also, in the length direction of the beam, the supports 12, 1
The arrangement interval of 2 depends on the beam width and beam, but the beam width W ₀₅
0cm, foundation beam of about 200cm, 140cm
Arrange them at the front and back intervals. Usually, it is about 100 to 160 cm. If the supports 12 are arranged at predetermined intervals, the intervals can be determined, and it is easy to cut the sheet pile iron plate 22 to a predetermined length in advance.

Subsequently, the sheet pile iron plate (form plate) 22 (FIG. 1A) made of a corrugated iron plate in which waves continuously extend in the vertical direction is brought into contact with the support pillars 12, 12 and the support pillars 4, 4. 8 and the lower end 23 of the sheet metal plate 22
2 and are screwed (see FIG. 2).
(B)).

In order to maintain the verticality of the support 12, it is preferable that the ends 1a, 1a of the base material 1 of the support 12 be hardened by embankment 36 or buried in the soil. In addition, the length direction of the beam is the same as that of the adjacent sheet iron plate 22 and the support 1.
2 is retained as a beam formwork by locking with 2.

When all the sheet pile iron plates 22 and 22 a have been attached (FIG. 3), the excavated soil 24 is buried back to the outside of the sheet pile iron plate 22. The top surface of the soil under the slab of the backfilled soil is leveled, and a slab waste concrete 25 is poured (FIG. 2 (c)).

Reinforcing bars (upper and lower main reinforcing bars 26, 27, stirrups 28, etc.) are assembled between the sheet iron plates 22, 22 to form a reinforcing bar basket 29. At this time, the upper main reinforcing bars 26, 26 of the reinforcing bar cage 29 are placed and fixed on the horizontal member 10. In addition, the lower main reinforcing bars 27, 27 of the reinforcing bar cage 29 are
It is placed on the top or held in a state of floating above. Therefore, the reinforcing rod basket 29 is arranged and held at a predetermined position by the horizontal member 10 and the base material 1 (or block) (FIG. 2D). At this time, if necessary (for example, the rebar cover thickness is further required),
Arrange a block or the like on the upper part, and place the lower main reinforcing bar 2 on the block.
7 and 27 are placed (not shown).

Further, since these rebar assembling operations can be performed on the flat slab waste concrete 25, the operation efficiency is extremely good.

Subsequently, slab reinforcing bars are arranged (not shown), and concrete for foundation beams and slabs is cast. After the concrete strength is developed, the foundation beam 30
And the foundation slab 31 can form an integral structure (FIG. 2).
(D), FIG. 3).

In FIG. 3, reference numeral 33 denotes a pile buried beneath the column construction planned position, and reference numeral 34 denotes a pile 33 for the sheet pile iron plates 22a, 22a.
It is a holding material for holding in. In FIG. 3, reference numeral 35 denotes a formwork for a small beam, which is formed by notching the sheet metal plate 22 and locking the grooved iron plate in the cutout of the sheet metal plate.

In the above embodiment, the formation of the waste concrete 25 under the slab can be performed after the construction of the reinforcing bar cage 29 for the beam. In this case, leveling is performed on the soil under the backfilled slab, and rebar assembling work is performed thereon.

Further, in the above embodiment, the support member 12,
Although it is desirable from the viewpoint of work efficiency to use the steel sheet 15, an apparatus having a function of locking the arrow iron plate 22 and supporting the pressure of the soil or concrete received by the sheet iron 22, and the reinforcing cage 29
Can be used (not shown).

In the above embodiment, the sheet metal plate 22
It is possible to use an iron plate with continuous waves in the vertical direction
Although it is desirable in terms of work efficiency and strength, a member of another material and shape can be used as long as it can be used as a discarded form plate (not shown).

In the above embodiment, a veneer plate 21 for temporarily fixing the support is previously buried on the upper surface of the discarded concrete 20 so as to mark or temporarily fix the support in accordance with the installation position of the support. (FIG. 2A).

[0047]

Embodiment 3 Another embodiment of the support according to the present invention will be described with reference to FIGS. This embodiment is an embodiment in which the substrate of the first embodiment has a different cross-sectional shape.

(1) For general position L ₁ (20 to 20) on both sides of the width W ₀ of the foundation beam to be constructed
The base material 51 having a length L about 30 cm) is disposed. The base member 51 has an L-shaped cross section and is formed in an integral shape including a horizontal member 53 and a vertical member 52.

[0049] On the horizontal member 53 of the substrate 51, at a predetermined interval to correspond to the beam width W _0, substantially U-shaped cross section (groove type steel)
The two support columns 54, 54 are erected and fixed. At this time, the webs 55 of the support columns 54, 54 are placed in the width direction of the foundation beam (the base material 1).
Along the length direction), and the lower end portion is fixed to one surface 52 a of the vertical member 52 of the base material 51. In addition, each of the support columns 54
The other support pillar 54a is arranged with the web 55 facing the other, and the lower end of the web 55 of the other support pillar 54a is
2 is fixed to the other surface 52b.

In the above, L ₁ is the same as in Example 1,
Normally, the distance is set to “分 の” to “５” of the beam to be constructed. That is, for example, at a beam of 200 cm,
It is about 15 to 40 cm. This is to prevent rotation of the support within the cross-sectional plane of the foundation beam to be formed, and to ensure workability.

The upper ends 59, 59 of the support columns 54, 54
In the meantime, a horizontal member 60 for holding the reinforcing bar and facing the earth pressure received by the support columns 54, 54 is erected and fixed. The horizontal member 60 has a U-shaped cross section, and the vertical pieces 60a are adhered to the opposing support columns 54, 54a to suppress deformation of the entire support.

As described above, the support 62 of the present invention
(FIGS. 6A and 6B).

In the above embodiment, two support columns 54, 54a having a substantially U-shaped cross section are used.
“a” may be formed into a substantially L-shaped cross section in which the outer flange is omitted (FIG. 7). In this case, the opposite support 6
It is easy to install the sheet pile iron plate 22 between 2 and 62.
For example, one side of the sheet pile iron plate 22 is locked between the flanges of the U-shaped support columns 54 of one support 62, and the other side is then contacted with the L-shaped support columns 54a of the other support 62. I can contact you.

(2) For Pillar Construction Position In the above, the support tool used to be continuously connected to the pillar construction planned position to be connected to the foundation beam is formed at an angle to the foundation beam form plate. Is arranged. In this case, only the support column 54 of the support is used, the support column 54a is omitted, and a locking rod 64 made of L-shaped steel is fixed along the support column 54 so as to be able to lock the formwork arranged obliquely. The supporter 65 used is used (FIG. 9).

In addition, at the position where the normal pillar is to be constructed, the surface 20b of the discarded concrete 20 is formed to be lower than the surface 20a at the position where the foundation beams are arranged by a height H (normally about 150 mm). Accordingly, the support 65 is placed on the surface 20b of the discarded concrete 20 at the position where the pillar is to be constructed, and one side of the receiving plate 66 having the ribs 67 formed on both sides placed on the surface 20a of the discarded concrete 20 on the foundation beam side. It is placed, and the other side is inserted between the support columns 54
7 and 67 are fixed to the outer surface of the flange 66 inside the support column 54 (FIGS. 8A and 8B). Also, the support columns 54, 54
An iron plate is arranged below the receiving plate 66 so as to close the opening of the portion (not shown).

When the pillar form plate is disposed at a right angle or another angle with respect to the foundation beam form plate, the locking rod 54 is fixed at a corresponding position (FIG. Not shown).

Further, a member that forms a groove that can hold and support the end of the sheet metal plate 22 can be fixed to the support column 54 (not shown). This is also possible for the support columns 54 and 54a of other embodiments.

(3) For small beams In addition, the support used in the position where the small beams are erected will be described.

A support member 65a composed of only the support columns 54 and having a structure in which the locking rod 64 and the receiving plate 66 are omitted, a W is provided between the vertical members 52, 52 of the base member 51 facing each other.
₃ and are arranged in parallel (FIG. 10B). In the above, the width W ₃ is are corresponding to the beam width of the small beams of the planned construction. Further, a locking rod 64 may be provided on the support 65 (not shown).

Between the supporting columns 54 of the supporting members 65a, 65a, a beam frame 68 for a beam made of a steel plate or the like bent in a groove shape corresponding to the cross section of the beam to be constructed is fixed. The closing plate 70 is fixed to the flanges 56, 56 inside the supporting columns 54 of the supporting tools 65a, 65a so as to cover the lower side of the bottom plate 69 of the formwork 68.

As described above, the support 71 for the part where the small beam is erected is constituted (FIGS. 10A and 10B).

Further, the intermediate portion of the beam is supported on both ends of a base 72 made of channel steel along the outer surface of the bottom plate 69 of the frame 68 for the beam, and the side plates of the frame 68 for the beam. This is performed by a support member 74 which is formed by erecting support columns 73, 73 made of channel steel along the outer surface of 69a (FIG. 11A).

In the above-described embodiment, the formwork 68 for the small beam is formed by bending a steel plate or the like into a groove shape. However, an iron plate or the like is formed by one or two members of the bottom plate 69 and the side plates 69a and 69a. It is also possible to form a groove shape by combining members consisting of In this case, the side plates 69a, 69a may be formed of corrugated iron plates similar to the sheet metal plate 22, and the bottom plate 69 may be formed of ordinary iron plates (FIG. 11B). Also, the bottom plate 6
9 can be omitted, and the formwork 68 for the small beam can be constituted by only the side plates 69a, 69a.

[0064]

Embodiment 4 Next, the use of the supports 62, 65, 71 and 74 of Embodiment 3, that is, a method of constructing a foundation beam of the present invention will be described with reference to FIG.

At the position where the foundation beam is to be constructed at the construction site, the beam width W _{2 is} wider than the beam width W ₀ by D ₂ (about 20 cm on one side), and the width W ₂
Excavation so that it becomes the bottom surface 18 of the excavation (root cutting)
17 is formed. Said D ₂ is dumping concrete,
Since the length at which ink can be extracted is sufficient, the width can be significantly reduced as compared with the related art. Accordingly, at this time, the amount of the remaining soil disposal is reduced to about one third of the conventional amount, and the backfill soil can be filled in the ground (planned slab position) 19 between the foundation beams.

The periphery of the bottom surface 18 of the excavation concave portion is leveled with a width W ₂ , and if necessary, the concrete is divided and the discarded concrete 20 is poured (FIG. 2A). On this occasion,
Generally, discarded concrete is cast on the entire bottom surface 18. However, since each support is processed into a predetermined shape in advance, the discarded concrete 20 can be cast only at the position where the support is to be installed for fixing the support. .

The ink is printed on the discarded concrete 20, the support 62 and the like are arranged, and the base material 51 is temporarily fixed with nails or the like. At this time, the position of the beam and the flange 56 inside the support columns 54, 54
Arrange them so that the positions correspond. Moreover, because it uses metal fitting 76 in this embodiment, the arrangement interval of the support 62, beam width, although depending on the Sei Ryo, the beam width W ₀ 40 cm, with footing beams of about Sei Ryo 140cm, 220 cm before and after Place at intervals. If the supports 62 are arranged at predetermined intervals, the intervals can be determined, and it is easy to cut the sheet pile iron plate 22 to a predetermined length in advance at a factory.

Further, a support 65 is arranged at the column construction planned position. Further, a support 71 is arranged at a position where the small beam intersects with the beam (FIG. 5).

Subsequently, the sheet pile iron sheet (form plate) 22 (FIG. 6A) made of a corrugated iron sheet in which waves continuously extend in the vertical direction is connected to the flanges of the support columns 54, 54 of the adjacent support members 65, 62, 71. It is arranged between 56 and 56 (FIG. 2B). In addition, between the sheet pile iron plates 22 between the supports 62, 62, 65, reinforcing metal members 76, 76 having a groove shape along the cross-sectional shape of the lower end portion (earth pressure becomes maximum) of the beam to be constructed are provided. Insert (FIG. 6A). In addition, the sheet iron plate 22 may be a pre-made corrugated or flat plate (not shown) as long as it can resist earth pressure.

Further, in order to maintain the verticality of the support 62 or the like, the end of the base material 1 such as the support 62 is hardened by embankment 36 or buried in the soil, and then the whole is backfilled. (FIG. 2B). Further, the beam length direction is held as a beam form by locking the adjacent sheet pile iron plate 22 and the supports 62, 65, 71.

When the attachment of the sheet pile iron plates 22 and 22 a for the girder is completed (FIG. 5), the excavated soil 24 is buried back to the outside of the sheet pile iron plate 22. By digging a groove for arranging a formwork for small beams in parallel and using the digged soil for backfilling the outside of the sheet pile iron plate 22, it is possible to reduce the amount of work and cost required to carry out and carry in the remaining soil. be able to.

Subsequently, the formwork 68 for the small beam is erected between the support members 71 in the groove for the small beam. here,
Supports 74, 74 are arranged at an intermediate position of the mold frame 68.

Subsequently, the upper surface of the soil below the slab of the backfilled soil is leveled, and a slab waste concrete 25 is poured (FIG. 2C).

Reinforcing bars (upper and lower main reinforcing bars 26, 27, stirrups 28, etc.) are assembled between the sheet iron plates 22, 22 to form a reinforcing bar cage 29. At this time, the upper main reinforcing bars 26, 26 of the reinforcing bar cage 29 are placed and fixed on the horizontal member 60. Also, the lower main reinforcing bars 27, 27 of the reinforcing bar cage 29 are held in a state of floating above the base material 51 such as the support 62 by a predetermined distance (about 7 cm; about the cover thickness of the lower main reinforcing bar 27) (FIG. 6).
(A)). Therefore, the reinforcing rod basket 29 is arranged and held at a predetermined position by the horizontal member 60 (FIG. 2D).

Further, since these rebar assembling operations can be performed on the flat slab waste concrete 25, the operation efficiency is extremely good.

Subsequently, a slab reinforcing bar is arranged (not shown), and concrete for the foundation beam and the slab are simultaneously poured. After the strength of the concrete is developed, the foundation beam 20 and the foundation slab 31 can form an integral structure (FIG. 2D).

In FIG. 5, reference numeral 33 denotes a stake buried under the column construction planned position.

Further, other embodiments of each support and sheet pile iron plate 22 in the above embodiment are the same as those in the second embodiment (not shown).

[0079]

According to the present invention, since the discarded form plate can be locked to the support for holding the reinforcing bar cage, the soil that has been rooted outside the discarded form plate can be backfilled before the reinforcing bar cage is constructed, and the ground that has been backfilled can be used. Since the work can be performed on the above, there is no need for the conventional scaffolding for transporting reinforcing bars, formwork materials, etc., and there is an effect that the safety of transporting and assembling the reinforcing bars can be ensured, and the working efficiency can be improved. In addition, if the ground that has been backfilled is leveled and the concrete thrown away is cast in advance, the concrete of the foundation beam and the foundation slab can be cast together, shortening the construction period,
There is an effect that the foundation beam and the foundation slab can be formed into an integrated structure without splicing.

Further, since the discarding form plate is locked to the support and the reinforcing steel cage can be held at a predetermined position in the discarding form plate, no working space is required on the bottom of the root cutting, and the amount of excavation of the ground can be greatly reduced. There is an effect that can be reduced. In addition, since the excavated soil can be piled up as a backfill soil around the foundation to be constructed, there is no need to re-import separately purchased backfill soil. Therefore, there is an effect that the construction period and cost required for excavation and backfilling can be reduced, and the remaining soil treated as industrial waste can be reduced.

[Brief description of the drawings]

FIG. 1A is a front view of a support according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG.

FIGS. 2A to 2D are schematic longitudinal sectional views illustrating a construction method according to the present invention.

FIG. 3 is a schematic plan view illustrating an arrangement of a support and a mold plate according to the first embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view illustrating locking of the support and the formwork plate according to the first embodiment of the present invention.

FIG. 5A is a schematic plan view of a foundation beam formwork constructed by the support according to the third embodiment of the present invention, and FIG. 5B is a cross-sectional view taken along line BB of FIG. is there.

FIG. 6A is a front view of a support (intermediate) according to a third embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line CC of FIG.

FIG. 7 is a cross-sectional view taken along line CC of FIG. 6A, illustrating another support tool.

8 (a) is a left side view and FIG. 8 (b) is a front view of the support tool (for a column construction position) according to the third embodiment.

FIG. 9 is a plan view of a support tool (for a column construction position) in a state where a locking tool is attached.

FIG. 10 is a view similar to FIG.
Is a longitudinal sectional view, and (b) is a sectional view taken along line DD of (a).

FIG. 11 is a front view of a support tool (for intermediate support of a small beam) according to the third embodiment.

12 (a) to 12 (d) are schematic longitudinal sectional views for explaining a conventional method of constructing a foundation beam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 4 Support pillar 8 Contact surface (support pillar) 10 Horizontal material 11 Notch (base material) 12 Support tool 15 Support tool 17 Excavation concave part 18 Bottom surface 29 Reinforcing cage 30 Foundation beam 31 Slab 40 Excavation concave part (conventional example) 41 bottom surface (conventional example) 43 ground scaffold (conventional example) 44 formwork plate (conventional example) 45 formwork (conventional example) 51 base material 54 support column 54a support column 60 horizontal member 62 support member 65 support member 71 support member 74 Support

Claims (4)

[Claims] An earth pressure applied to a discarded form plate at a predetermined interval along a planned beam construction position on the bottom surface at a predetermined interval along a planned beam construction position. A support tool for supporting the pile is placed, and a discarded formwork plate for a foundation beam serving as a sheet pile for retaining is erected and locked between the supports, and excavated soil is backfilled outside the discarded formwork plate. In the discarded form plate, constructing a reinforcing bar for a foundation beam, holding the upper part of the reinforcing bar in a support, and casting concrete in the discarded form plate to construct a foundation beam. Construction method of the foundation beam which was the feature. 2. After backfilling excavated soil outside the waste form plate, the soil at the slab construction planned position is leveled, and concrete for the slab is poured, and then the waste form material is placed inside the waste form plate. Then, a reinforcing bar for the foundation beam is constructed, the upper part of the reinforcing bar is held by the support, and the concrete for the foundation beam and the foundation slab is poured into the disposal formwork and the upper surface of the disposal concrete for the slab. The method for constructing a foundation beam according to claim 1, wherein the foundation beam is constructed by means of: 3. A supporting tool for holding a reinforcing cage and a formwork when constructing a concrete foundation beam, the support tool being provided on a bottom surface of a root-cut recess corresponding to a width direction of the foundation beam to be constructed. On the base material that can be placed, support pillars that can lock the side edges of the waste form plate are erected in parallel at intervals corresponding to the width of the foundation beam, and support pillars are provided at the upper ends of the two support pillars. A support member provided with a horizontal member for holding the support. 4. The method according to claim 1, wherein both ends of the base material are projected outward from the support pillars at a length of "1/8" to "1/5" of the beam of the foundation beam to be constructed. 4. A support according to claim 3, wherein