JP3027498B2 - Precast concrete foundation and its construction 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 precast concrete foundation, and more particularly, to a precast concrete foundation for constructing a cloth foundation and a method of constructing the same.

[0002]

2. Description of the Related Art In general, independent foundations and cloth foundations are known as foundations for buildings, especially as direct foundations.

[0003] Independent foundations are constructed such that a foundation is partially constructed in a construction part of a building, and the partial foundation supports a load such as a pillar.

[0004] In addition, the cloth foundation is constructed such that the foundation is continuously constructed on the construction part of the building, and the load of the building is supported by the continuous foundation.

[0005]

In the above-mentioned independent foundation, the construction of the foundation is only partial, so that the construction is simple,
Although it can be performed in a short time, since the load of the building is partially supported, the load concentrates. In order to receive the load, the ground strength of the ground on which the foundation is built must be high.

Accordingly, when an independent foundation is used on a ground having a low ground bearing capacity, a pile must be driven into the ground, and the pile must be supported by the pile. There was a problem of becoming.

Further, in the above-mentioned cloth foundation, since the load of the building is supported by a continuous foundation, the load is dispersed, and the ground bearing capacity is such that an independent foundation without pile driving can be used. Although it is not possible, it can be used even for ground with a certain level of soil bearing and low ground bearing,
Since a continuous foundation must be constructed, there is a problem in that the construction is troublesome, the construction time is long, and the cost is high.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to be able to be applied to a ground having a certain level of ground strength but a low level of ground strength. An object of the present invention is to provide a precast concrete foundation that can be performed in a short time and that is inexpensive, and a method of applying the same.

In order to achieve the above object, a precast concrete foundation according to a first aspect of the present invention comprises: a precast concrete cloth base having a predetermined length continuously disposed on a foundation building portion of a building; With a precast concrete fabric beam of a predetermined length to be erected,
The cloth base has an upright portion formed along a long side of the upper surface.
Part, and a plurality of formed at predetermined intervals in the longitudinal direction
Reinforcing beams and mortar casting formed on the upper surface between the reinforcing beams
With an opening for, covering the lower part of the fabric beam and the upper part of the surrounding ground, and the inside is formed in a hollow shape with a lower opening,
The cloth base and the cloth beam are installed at predetermined intervals on the ground.
Characterized in that both ends are placed and supported on the center base .

[0010]

[0011] In the precast concrete foundation according to a second aspect of the present invention, the center base is formed of a substantially rectangular precast concrete lower plate having a through hole in the center and a smaller plate than the lower plate. And a precast concrete upper plate installed in the lower plate, and the lower plate and the upper plate are joined by mortar filled in through holes of the lower plate.

[0012] In the precast concrete foundation according to a third aspect of the present invention, the center of the center base for installation is indicated in advance on the lower part of the center base, and the core of the center base is indicated on the upper part for installation and the cloth is installed. Is characterized in that the cloth outer surface position indication is given in advance.

In a precast concrete foundation according to a fourth aspect of the present invention, the fabric beam comprises a thin portion having a concave portion on one end at both ends and a thick portion adjacent to a position closer to the center of the thin portion. And a cloth base,
On the lower surfaces at both ends, a center base installation surface installed on the outer edge of the lower surface of the center base, and formed on the reinforcing beam upper surface at both ends, and the height from the center base installation surface is equal to the thickness of the upper plate. With a fabric beam installation surface formed correspondingly,
The thick part at the end of the fabric beam is supported by the fabric installation surface.

In the precast concrete foundation according to a fifth aspect of the present invention, the upper surface of the reinforcing beam at an intermediate position located between the reinforcing beams at both ends having the fabric beam setting surface is formed lower than the fabric beam setting surface. It is characterized by:

[0015] A construction method of a precast concrete foundation according to a sixth invention is a construction method of a precast concrete foundation for constructing a foundation using a center base, a cloth base and a fabric beam made of a lower base and an upper base made of precast concrete. There, a step of forming a continuous root excavation portion by excavating a foundation construction portion of the ground, and applying mortar to a fabric beam joining position in the root excision portion, height-adjusting the mortar thereon, and applying a mortar to the lower ground Install the lower panel while adjusting the center position using the center position display, and install the cloth base on the outer edge of the upper surface of the lower panel while adjusting the center position using the center position display applied to the upper panel on this lower panel. Installing the upper base smaller than the lower base while leaving the surface, and forming the center base, and setting the center base mounting surfaces formed on the lower surfaces at both ends of the cloth base on the cloth base mounting surface of the lower base. hand, Crossing the cloth base between the intermediate bases, and forming the cloth beam by matching the outer surface of the thin-walled lower surface formed at the joints at both ends of the cloth beam with the outer surface position display of the cloth beam applied to the upper panel. The center base is placed and supported on the upper surface of the upper plate, and the lower surface of the thick portion of the joint portion is placed and supported on the cloth beam installation surface formed so as to coincide with the upper surface of the upper plate in the installed state of both ends of the cloth base. Setting, filling the mortar into the joints and the root cutting portions of the cloth beams, and wrapping the mortar around the lower part of the cloth base through the openings formed in the cloth base, so that the cloth base and the lower part of the cloth beams and And connecting and integrating the fabric beams with each other.

[0016]

According to the first aspect of the present invention, by forming a cloth base with a cloth base made of precast concrete and a cloth beam, even if the ground bearing capacity is not so high, the load of the building can be dispersed. Since the fabric base and beam are preformed in precast concrete, it is only necessary to carry these fabric base and beam to the construction site and install them. Compared with the case of constructing the construction, the construction can be simplified, the construction time can be shortened, and the cost can be reduced.

Further, by forming the cloth base and the cloth beam separately and forming the cloth base on a hollow whose inside is open at the lower part, the weight of the basic components is reduced, and the transportation is facilitated. The construction work can also be facilitated.

[0018] Further , a plurality of reinforcing beams formed at predetermined intervals in the longitudinal direction of the cloth base can maintain a sufficient strength even when the cloth base becomes a certain length. The mortar can be easily cast below the inside of the cloth base from the mortar casting opening formed in the cloth base, and furthermore, the mortar can be formed at the lower part of the cloth beam by the rising part formed along the longitudinal side of the upper surface of the cloth base. Can be held in contact with the fabric base, and the connection between the fabric base and the fabric beam can be ensured. In addition, cloth base and
By supporting both ends of the fabric beam with the center base,
Relatively small center base height and centering
The height and centering of the cloth base and cloth beam easily?
Can be performed reliably.

In the second invention, the lower base is installed by dividing the center base into a lower base and an upper base, and joining the lower base and the upper base with mortar filled in through holes of the lower base. In this state, it is possible to easily perform the alignment of the upper panel installed on the lower panel.

According to the third aspect of the present invention, the alignment of the center base on the lower panel can be easily performed by displaying the center position on the lower panel, and the center position display on the upper panel can be easily performed. The position of the upper panel can be easily adjusted at the time of installation, and the installation position of the upper beam can be easily confirmed by displaying the outer surface position of the upper beam. Alignment can be performed easily and in a short time.

According to the fourth aspect of the present invention, the cloth base is provided with an installation surface on the cloth beam whose height from the installation surface of the center base corresponds to the thickness of the upper plate, so that the installation surface of the center base of the cloth base is centered. Just by installing the outer edge of the upper surface of the lower base of the base, the height of the upper surface of the upper base of the center base coincides with the height of the fabric beam installation surface. Can be supported on the fabric beam installation surface, and as a result, it is possible to prevent the fabric beam from tipping over when the fabric beam is erected.

According to the fifth aspect of the present invention, the upper surface of the reinforcing beam at the intermediate position is lower than the surface on which the fabric beam is installed, so that the mortar can easily flow around the lower surface of the fabric beam during mortar filling. The connection between the base and the fabric beam can be ensured.

According to the sixth aspect of the present invention, after the root is cut, the lower plate and the upper plate constituting the center base are installed at the positions where the fabric beams are joined, without placing discarded concrete. Just by performing adjustment and center position adjustment, the cloth beam can be accurately positioned, and the cloth base and the cloth beam can be installed without troublesome positioning work, simplifying the construction work and shortening the construction time. And the construction cost can be reduced.

Further, it is possible to prevent the overturning of the fabric beam when the fabric beam is erected, and it is possible to sufficiently mix the mortar between the fabric base and the fabric beam, thereby ensuring the joining between the fabric base and the fabric beam. Becomes possible.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

1 to 8 are views showing a precast concrete foundation according to one embodiment of the present invention.

As shown in FIG. 1, the precast concrete foundation of this embodiment comprises a center base 10, a cloth base 12, and a cloth beam 14, and these center base 10, cloth base 12, Each of the fabric beams 14 is formed of precast concrete.

The center base 10 is provided with a fabric beam 1 in a continuous root cutting portion formed by excavating a foundation construction portion of the ground.
4 at which the end portions of the cloth base 12 and the cloth beam 14 spanned between the center bases 10 are placed. As shown in FIG. Have been.

The lower platen 16 supports and supports the end of the cloth base 12, and as shown in FIG. 3, is large enough to mount the cloth base 12 and is formed in a substantially square shape. It has become. Further, the lower platen 16 is placed on a mortar provided at a joining position of the fabric beams 14 in the root cutting portion.
At the center is a through hole 2 for the mortar to enter.
It is formed into zero. The through hole 20 is formed smaller than the upper plate 18 so as not to hinder mounting of the upper plate 18 on the lower plate 16. Further, on the upper surface of the lower panel 16, a core position display 22 for position adjustment at the time of installation is given in advance, and the position can be easily adjusted based on the core position display 22.

The upper plate 18 is mounted and supported on the upper surface of the lower plate 16, and as shown in FIG.
It is formed in a square shape that is larger and smaller than the size of the lower plate 16. Therefore, the upper plate 18 is connected to the lower plate 1
2, the cloth base installation surface 24 can be exposed at the outer edge of the upper surface of the lower platen 16, as shown in FIG. On the upper surface of the upper panel 18, the end of the fabric beam 14 is placed. On the upper surface of the upper panel 18, in addition to the center position display 26 for position adjustment when the upper panel 18 is installed, Cloth beam 1
Outer surface position display 28 indicating the position of the installation 4 at the time of installation
Is applied in advance. Therefore, lower board 1
6, the upper plate 18 is placed thereon, and when the position is adjusted, the installation position of the fabric beam 14 is automatically set. Note that the upper plate 18 is joined and integrated with the lower plate by mortar that has entered the through holes 20 of the lower plate 16.

As shown in FIGS. 5 and 6, the cloth base 12 is placed between the lower plates 16 of the center base 10 and supports the cloth beam 14 on the upper surface. The cloth base body 30 includes a cloth base body 30 having a predetermined length and a shape covering the lower part and the surrounding ground and a reinforcing beam 32 integrally formed at a predetermined interval in the longitudinal direction of the cloth base body 30.

The cloth base body 30 has a hollow interior and an open lower end, and is light in weight and easy to carry. In addition, a center base installation surface 34 which is installed on the cloth base installation surface 24 formed on the outer edge of the upper surface of the lower plate 16 of the center base 10 is formed at the lower ends of both ends of the cloth base main body 30. The cloth base body 30 extends between the lower boards 16 by disposing the 34 on the lower board 16. Further, an opening 36 for mortar casting is formed between the reinforcing beams 32 on the upper surface of the cloth base body 30, and mortar can be cast from the opening 36 into a lower space covered by the cloth base body 30. Like that. A rising portion 38 is formed on the upper surface of the cloth base body 30 so as to protrude along the longitudinal side. When the mortar is cast, the rising portion 38 extends from the lower end of the fabric beam 14 to a fixed height. To secure the engagement and integration of the cloth base 12 and the cloth beam 14 by the mortar.

The reinforcing beams 32 are provided so that sufficient strength can be obtained even when the cloth base body 30 is formed hollow inside, and the number of reinforcing beams 32 is set so as to match the strength. Further, of the plurality of reinforcing beams 32, the reinforcing beams 32 located at both ends are formed higher than the intermediate reinforcing beams 32,
The upper surfaces of the reinforcing beams 32 at both end positions are formed as cloth beam installation surfaces 40. Therefore, in a state where the lower surface of the fabric beam 14 is placed and supported on the fabric installation surface 40 (see FIG. 7), the upper surface of the intermediate reinforcing beam 32 and the lower surface of the fabric beam 14 are arranged as shown in FIG.
A gap as shown in FIG. 1 is formed, and the mortar is wrapped around the gap so that the bonding between the cloth base 12 and the cloth beam 14 is strengthened. Further, the cloth beam installation surface 40 is formed so that the height from the center base installation surface 34 corresponds to the thickness of the upper plate 18. The height of the upper surface and the height of the fabric beam installation surface 40 are set so as to match.

As shown in FIGS. 1 and 2, the fabric beam 14 is erected between the upper plates 18 of the center base 10, and is mounted on the upper surface of the upper plate 18 and the fabric mounting surface 40 of the fabric base 12. It is joined along the root cutting portion in a state where it is placed and supported, and is made into a continuous state, and is composed of a fabric beam main body 42 and a joining portion 44.

The cloth beam main body 42 is formed in a rectangular shape having a predetermined length, and is formed to be slightly longer than the cloth base main body 30.

The joining portions 44 are formed at both ends of the cloth beam main body 42, and include a thin portion 46 having one surface recessed at both ends.
A thick portion 48 adjacent to a position near the center of the thin portion 46 and adjacent to the thick portion 4 of the two fabric beams 14 to be joined.
A concrete form is attached between the concrete forms 8, a reinforcing bar 50 is arranged between the concrete form and the thin portion 46, and mortar is cast to integrate the concrete form. The lower surface of the thin portion 46 is placed on the upper plate 18 of the center base 10, and the lower surface of the thick portion 48 is
The thick portion 48 is placed on the fabric beam installation surface 40 of the fabric base 12 set at a height that matches the height of the thick portion 48.
Are supported on the fabric beam installation surface 40 to prevent the fabric beam 14 from falling down when standing upright.

Next, a method of applying the above-mentioned precast concrete foundation will be described.

First, a continuous foundation section 52 is formed by excavating a foundation construction portion of the ground. In this case, the root cutting part 5
Crushed stone is applied to the bottom of 2 and the soil is compacted to perform the local business. After performing the local business, a water thread is put on the bottom of the root cutting part 52 in accordance with the foundation core.

Next, a mortar 54 is applied to the joining position of the fabric beams 14 in the root cutting portion, and the lower plate 16 of the center base 10 is set on the mortar 54. In this case, the core position is adjusted in accordance with the core position display 22 previously applied to the lower plate and the water thread stuck in the root cutting portion 52, and the height of the lower plate 16 is adjusted.

Next, the upper plate 18 is set on the upper surface of the lower plate 16 after the center position adjustment and the height adjustment. At the time of this installation, the center position display 26 previously applied to the upper panel 18 is adjusted in accordance with the water thread in the root cutting portion 52 to adjust the center position. By adjusting the center position of the upper plate 18, the cloth outer surface position indication 28 applied to the upper plate 18 is accurately set to the outer surface position of the cloth beam 14. Also, the upper plate 18 is simply installed on the lower plate 16, and the mortar 54 that has entered the through-hole 20 of the lower plate 16 contacts the upper plate 18 to join and integrate the lower plate 16 and the upper plate 18. Becomes Then, in this state, the cloth base installation surface 24 is exposed at the outer edge of the upper surface of the lower panel 16. The work up to this point can be easily performed without using a machine such as a heavy machine.

Next, the center base setting surfaces 34 formed on the lower surfaces of both ends of the cloth base 12 are set on the cloth base setting surface 24 of the lower panel 16, and the cloth base 12 is bridged between the center bases 10. In this case, the height of the upper surface of the upper plate 18 and the height of the floor beam installation surface 40 of the cloth base 12 coincide with each other when the cloth base 12 is stretched over the lower plate 16.

Next, both ends of the fabric beam 14 are passed over the upper plate 18. In this case, the lower surface of the thin portion 46 formed at the joints 44 at both ends of the upper beam 14 is aligned with the outer surface 56 thereof and the outer outer surface position indication 28 provided on the upper panel, and the upper beam 14 is moved to the center base 10. The placement and support on the upper surface of the upper plate 18 makes it possible to accurately and easily position the cloth beams 14. Further, when both ends of the fabric beam 14 are placed and supported on the upper plate 18, the lower surface of the thick portion 48 of the joint portion 44 has the same height as the upper surface of the upper plate 18. And the contact range in the thickness direction of the fabric beam 14 is expanded, so that the fabric beam 14 can be prevented from tipping over.

Next, a concrete form is attached between the thick portions 48 of the two fabric beams 14 to be joined, and a reinforcing bar 50 is provided between the concrete form and the thin portion 46.

Then, the joining portion 44 and the root cutting portion 5
Mortar is cast on the bottom of the fabric beam 2 and the fabric beams 14
And the cloth base 12 and the center base 10 are respectively joined and integrated by mortar. In this case, the root cutting portion 52
When the mortar is filled into the cloth base 12 through the opening 36 formed on the upper surface of the cloth base 12 and the mortar is cast to the position of the rising portion 38, the lower surface of the cloth beam 14 and the intermediate reinforcing beam 32 are formed. The mortar enters the gap between them and the mortar is secured up to the position of the rising portion 38, so that the joining of the fabric beam 14 to the fabric base 12 is ensured.

Then, after the mortar that has been cast is solidified, the concrete formwork is removed from the joint portion 44 of the fabric beam 14 to complete the foundation work.

As described above, the cloth foundation can be constructed in a short time with a simple operation, and the construction cost can be reduced. Further, the weight reduction of the cloth base 12 facilitates the transportation and the construction work.

[0047]

According to the first aspect of the present invention, by forming a fabric base with a fabric base made of precast concrete and a fabric beam, even if the ground bearing capacity is not so high, the load on the building can be reduced. It can be received in a dispersed manner, and since the cloth base and the beam are formed in advance by precast concrete, it is only necessary to carry these cloth base and the beam to the construction site and install them. The construction can be simplified, the construction time can be shortened, and the cost can be reduced as compared with the case where a cloth foundation is constructed.

Further, by forming the cloth base and the cloth beam separately and forming the cloth base on a hollow whose inside is open at the lower part, the weight of the basic components can be reduced and the transportation can be facilitated. The construction work can also be facilitated.

Further , a plurality of reinforcing beams formed at predetermined intervals in the longitudinal direction of the cloth base can maintain a sufficient strength even when the cloth base has a certain length. The mortar can be easily cast below the inside of the cloth base from the mortar casting opening formed in the cloth base, and furthermore, the mortar can be formed at the lower part of the cloth beam by the rising part formed along the longitudinal side of the upper surface of the cloth base. Can be held in contact with the fabric base, and the connection between the fabric base and the fabric beam can be ensured. Also, cloth base and cloth
Compared by supporting both ends of the beam at the center base
By centering the height and centering of a small center base,
The height and centering of the fabric base and beam can be
You can do it.

In the second invention, the center base is divided into a lower plate and an upper plate, and the lower plate is installed by joining the lower plate and the upper plate with mortar filled in through holes of the lower plate. In this state, it is possible to easily perform the positioning of the upper panel installed on the lower panel.

According to the third aspect of the invention, the alignment of the center base on the lower panel can be easily performed by installing the center panel on the lower panel, and the center position displayed on the upper panel can be easily adjusted. The position of the upper panel can be easily adjusted at the time of installation, and the installation position of the upper beam can be easily confirmed by displaying the outer surface position of the upper beam. Alignment can be performed easily and in a short time.

According to the fourth aspect of the present invention, the installation base is provided on the cloth base such that the height of the cloth base from the installation surface of the center base corresponds to the thickness of the upper plate. Just by installing the outer edge of the upper surface of the lower base of the base, the height of the upper surface of the upper base of the center base coincides with the height of the fabric beam installation surface. Can be supported by the fabric beam installation surface, and as a result, the fall of the fabric beam during standing of the fabric beam can be prevented.

According to the fifth aspect of the present invention, the upper surface of the reinforcing beam at the intermediate position is lower than the surface on which the fabric beam is installed, so that the mortar can easily flow around the lower surface of the fabric beam when filling the mortar. The connection between the base and the fabric beam can be ensured.

According to the sixth aspect of the present invention, after the root is cut, the lower plate and the upper plate, which constitute the center base, are installed at the position where the fabric beams are joined without placing the discarded concrete. Performs accurate positioning of the fabric beam for adjustment and center position adjustment, enables installation of the fabric base and fabric beam without performing complicated positioning work, and simplifies construction work and shortens construction time. And the construction cost can be reduced.

Further, it is possible to prevent the overturn of the fabric beam when the fabric beam is erected, and furthermore, it is possible to sufficiently mix the mortar between the fabric base and the fabric beam, thereby ensuring the joining between the fabric base and the fabric beam. Can be.

[Brief description of the drawings]

FIG. 1 is a partial plan view of a precast concrete foundation according to one embodiment of the present invention.

FIG. 2 is a sectional view of a joint portion of the precast concrete foundation of FIG.

FIG. 3 is a plan view of a lower plate of a center base.

FIG. 4 is a plan view of an upper panel of a center base.

FIG. 5 is a plan view of a floor base.

FIG. 6 is a side view of a floor base.

FIG. 7 is a sectional view showing a state of a floor beam installation surface of a floor base.

FIG. 8 is a sectional view showing a state of a reinforcing beam in the middle of the floor base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Center base 12 Cloth base 14 Cloth beam 16 Lower board 18 Upper board 20 Through hole 22, 26 Core position display 24 Cloth base installation surface 28 Fabric outer surface position display 32 Reinforcement beam 34 Center base installation surface 36 Opening 38 Rise Reference Signs List 40 Fabric installation surface 44 Joint 46 Thin part 48 Thick part 52 Root cutting part 54 Mortar

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 27/01 102 E02D 27/01 101

Claims (6)

(57) [Claims] 1. A precast concrete cloth base of a predetermined length continuously arranged on a foundation building portion of a building, and a precast concrete cloth beam of a predetermined length erected on the cloth base. The cloth base has a rising edge formed along a longitudinal side of the upper surface.
Part, and a plurality of formed at predetermined intervals in the longitudinal direction
Reinforcing beams and mortar casting formed on the upper surface between the reinforcing beams
And an upper portion of the cloth beam, and covers the lower part of the cloth beam and the surrounding ground, and the inside is formed in a hollow shape with the lower part opened, and the cloth base and the cloth beam are installed at predetermined intervals on the ground.
Precast concrete foundation characterized in that both ends are placed and supported on a center base . 2. The lower base according to claim 1 , wherein the center base is formed in a substantially rectangular precast concrete lower base having a through hole in the center, and is formed smaller than the lower base, and is installed on the lower base. A precast concrete foundation comprising: a precast concrete upper plate; and joining the lower plate and the upper plate with mortar filled in through holes of the lower plate. 3. The method of claim 2, wherein the center-based footwall, subjected core position display for installation in advance, the upper plate, the core position display and fabric beams outside Nunohari for installation for installation Precast concrete foundation characterized in that surface position indication is given in advance. 4. The method of claim 2 or 3, wherein the fabric beam, a thin portion on one side is recessed at both ends positioned on both ends,
A center portion of the center portion of the lower portion of the center base; And a cloth beam installation surface formed on the upper surface of the reinforcing beam at both end positions, and a height from the center base installation surface corresponding to the thickness of the upper platen. A precast concrete foundation, wherein a thick portion is supported by the cloth beam installation surface. 5. The reinforcing beam according to claim 4 , wherein an upper surface of the reinforcing beam at an intermediate position located between the reinforcing beams at both ends having the fabric beam setting surface is formed lower than the fabric beam setting surface. Precast concrete foundation. 6. A precast concrete foundation construction method for constructing a foundation using a precast concrete lower base and upper base consisting of a lower base and an upper base, a fabric base and a fabric beam, wherein a foundation construction part of the ground is excavated. A step of forming a continuous root cutting portion, and applying mortar to the cloth beam joining position in the root cutting portion, while adjusting the core position using the height adjustment and the center position display applied to the lower plate on the mortar. Install the lower panel, and adjust the center position using the center position display on the lower panel while leaving the cloth base installation surface on the outer edge of the upper surface of the lower panel, and place the upper panel smaller than the lower panel. Installing the center base and setting the center base installation surfaces formed on the lower surfaces of both ends of the cloth base on the cloth base installation surface of the lower panel, and passing the cloth base between the center bases. And both of the cloth beams A thin bottom surface formed at the junction, and its outer surface, Nunohari is placed supported on the upper plate upper surface of the center base while combining the fabric beam outer surface position display which has been subjected to said upper plate,
And a step of placing and supporting the thick-walled lower surface of the bonding portion on a cloth beam installation surface formed in accordance with the upper surface of the upper base in the installed state of both ends of the cloth base; Fill the root cutting with mortar,
Wrapping the mortar around the lower part of the cloth base through the opening formed in the cloth base, and connecting and integrating the cloth base and the lower part of the cloth beam and the cloth beams. Construction method.