JP2023006744A - Constructing method of under-ground piled column and pile follower used therefor - Google Patents

Abstract

To provide a method for constructing an under-ground piled column and a pile follower capable of easily preventing the under-ground piled column from floating due to buoyancy.SOLUTION: A method of constructing an under-ground piled column, which is constructed in a hole provided in the ground, comprises steps of: inserting the under-ground piled column with a pile follower 10 attached to the upper end into the hole; and pouring concrete into the hole with the pile follower 10 attached to the upper end of the under-ground piled column and fixing an embedded portion of the under-ground piled column to the concrete pile. The method for constructing the under-ground piled column and the pile follower 10 are characterized by using the pile follower 10 having a main body portion 11 formed in a hollow columnar shape from a steel pipe and a cement hardened portion 16 placed inside the main body portion 11.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a method for erecting a reverse-strike support and a yatko used for this method.

A reverse construction method is known as a construction method for constructing a building having a ground portion and an underground portion. In the upside-down construction method, before excavating the ground to construct the underground structure, the ground is excavated by erecting upside-down pillars in the ground to support the above-ground part of the building. While constructing the underground structure, construction of the above-ground part on the upside-down pillars can be performed in parallel. As a result, the construction period of the building can be shortened compared to the method of proceeding with the construction of the above-ground part after completing the construction of the underground part.

In such a reverse-casting method, the reverse-casting post is fixed to the cast-in-place concrete pile at the embedded part by placing concrete in the hole after being inserted into the hole (first-in method). Alternatively, after concrete is placed in the borehole, it is inserted into the concrete and fixed to the cast-in-place concrete pile at the embedded portion (post-installation method). However, until the concrete placed in the hole hardens, buoyancy acts on the upside-down pillars. There is a risk of misalignment.

In order to solve this problem, conventionally, when erecting an upside down pillar in a hole in the ground, the inside of the upside down pillar is filled with fresh water (tap water) to increase the weight of the upside down pillar. A method has been proposed in which the buoyancy force of the reverse-strike strut is prevented from rising (see, for example, Patent Literature 1).

JP-A-2002-54164

However, in the above-described conventional method, after the concrete placed in the hole hardens and the upside-down pillar is fixed to the concrete pile, it is necessary to remove fresh water from the inside of the upside-down pillar, and the work is complicated. There was a problem that

The present invention has been made in view of the above-mentioned problems, and its object is to provide a method of erecting a reverse-strike support and a yattco that can easily prevent the lifting of the reverse-strike support due to the buoyancy of the support. be.

The erection method of the reverse-struck support of the present invention is a method of erecting the reverse-strike support in a hole provided in the ground, wherein the reverse-strike support is attached to the upper end of the reverse-strike support. a step of inserting into the hole; and a step of casting concrete into the hole while the yattco is attached to the upper end of the upside-down pillar, and fixing the embedded portion of the upside-down pillar to the concrete pile. and, as the yattco, one having a main body formed in a hollow columnar shape from a steel pipe and a cement hardening part placed inside the main body is used.

The yattco of the present invention is a yattco that is attached to the upper end of the reverse-struck support when the reverse-strike support is erected in a bore hole provided in the ground, and is formed of a steel pipe in the shape of a hollow column; and a cement-hardened portion placed inside the main body.

Advantageous Effects of Invention According to the present invention, it is possible to provide a method for erecting a reversed strut and a yattco that can easily prevent the reversed strut from floating due to buoyancy.

FIG. 10 is a front view of a state in which the jacks of the reverse-strike support used in the method for erecting the reverse-strike support according to one embodiment of the present invention are attached. FIG. 2 is a cross-sectional view showing the details of the yatko shown in FIG. 1; FIG. 3 is a cross-sectional view taken along line AA in FIG. 2; (a) is a diagram showing a hole provided in the ground, and (b) is a diagram showing a state in which reinforcing bars are erected in the hole shown in (a) of the figure. (a) is a diagram showing a state in which an upside-down pillar is inserted into a hole, and (b) is a diagram showing a state in which concrete is placed in the pit with the upside-down pillar inserted. FIG. 10 is a diagram showing a state in which an above-ground portion is being constructed while an underground portion is being constructed after the reverse-strike support is fixed to the concrete pile.

Hereinafter, a method for erecting a reversed strut and a yattco according to an embodiment of the present invention will be described in detail with reference to the drawings.

The reverse-strike support 1 shown in FIG. 1 is erected in a hole provided in the ground in the method for erecting a reverse-strike support according to one embodiment of the present invention.

The upside-down strut 1 is formed in a straight columnar shape with a predetermined length from a steel pipe with a rectangular cross section. The inside of the counterstrike support 1 is hollow. On the outer peripheral surface of the lower part of the upside down pillar 1, a plurality of studs 2 for engaging the upside down pillar 1 with the mat slab that constitutes the underground structure are arranged vertically and horizontally at predetermined intervals. Fixed. In addition, in FIG. 1, only one stud 2 is labeled for convenience. A part below the part where the plurality of studs 2 of the reverse-strike strut 1 are fixed forms an embedded part 3. - 特許庁The embedded portion 3 is a portion of the reverse-cast support 1 that is inserted into concrete placed in a hole and fixed to a concrete pile that has hardened.

In this embodiment, the upside-down strut 1 is formed entirely from a steel pipe with a rectangular cross section from the top end to the bottom end. The shape or configuration can be changed as appropriate, such as a configuration formed of so-called cross H-shaped steel.

When the upside-down post 1 is erected in a hole provided in the ground, a yattko (temporary pile) 10 according to one embodiment of the present invention is attached to its upper end.

As shown in FIGS. 2 and 3, the Yatko 10 has a straight hollow columnar body 11 of a predetermined length made of a steel pipe with a rectangular cross section having the same dimensions as the upside-down strut 1 . The Yatko 10 is fixed to the upper end of the reverse-strike strut 1 at the lower end of the body portion 11 so that the four sides overlap vertically. The attachment structure of the Yatko 10 to the upper end of the reversed strut 1 is, for example, as shown in FIG. Various structures such as a structure in which the connection plate 20 is fixed with a bolt 21 and connected to each other can be adopted as long as the Yatco 10 can be detachably attached to the reverse-strike strut 1 .

A lower end closing wall 12 that closes the lower end of the main body portion 11 is fixed to the lower end of the main body portion 11, and an upper end closing wall 13 that closes the upper end of the main body portion 11 is fixed to the upper end of the main body portion 11. A pair of hanging hooks 14 are fixed to the upper surface of the upper end closing wall 13 . A plurality of wing-like stoppers 15 are fixed to the outer peripheral surface of the main body 11 to prevent the yattco 10 from falling into the hole.

The Yatco 10 of this embodiment has a cement hardened portion 16 placed inside the body portion 11 . That is, the Yatco 10 of the present embodiment has a configuration in which a cement hardened portion 16 is filled inside a main body portion 11 formed of a steel pipe in a hollow columnar shape. The hardened cement portion 16 is filled inside the main body portion 11 before hardening, and is integrated with the main body portion 11 by hardening inside the main body portion 11 . Due to such a configuration, the Yatco 10 of the present embodiment is heavier than the conventional Yatco having a hollow interior.

The hardened cement portion 16 is obtained by hardening cement by mixing liquid such as water and aggregate. As the cement hardening part 16, for example, concrete hardened by mixing cement with sand (fine aggregate), gravel (coarse aggregate), and a liquid such as water, and cement with sand (fine aggregate). Mortar and cement obtained by mixing and hardening a liquid such as water, and soil cement obtained by mixing and hardening a liquid such as soil (fine aggregate) and water can be used. The hardened cement portion 16 may contain various additives in addition to the aggregate and liquid. Alternatively, the hardened cement portion 16 may be obtained by hardening a mixture of cement and a liquid such as water without adding aggregate.

The amount of the hardened cement portion 16 placed inside the main body portion 11 is that the total weight of the upside down pillar 1 and the yattco 10 is the amount of the embedded portion 3 of the upside down pillar 1 in the concrete placed in the hole. The amount is set to be larger than the buoyant force acting on the reverse striking strut 1 when the is inserted.

Next, when constructing a building having an above-ground part and an underground part by the upside down construction method, the upside down support 1 is erected in the hole provided in the ground by the upside down support erection method of the present embodiment. I will explain the procedure for loading.

First, as shown in FIG. 4( a ), a drilling device such as a drill is used to drill a predetermined depth at the planned erection position of the reversed strut 1 on the ground 30 of the construction site where the building is constructed by the reversed construction method. drill a hole 31 of In the illustrated case, the shape of the perforation is a cylinder whose diameter increases only at the bottom, but the shape can be changed as appropriate. Next, as shown in FIG. 4(b), a reinforcing bar 32 is erected at a predetermined position on the bottom side of the hole 31. Next, as shown in FIG.

Next, as shown in FIG. 5( a ), a crane (not shown) is attached to a crane (not shown) by using a wire 33 connected to the hanging hook 14 of the YATCO 10 at the construction site. ) and inserted into the hole 31 from the lower end side. At this time, a stand 34 is installed above the opening of the hole 31 , and guide rollers 35 provided on the stand 34 guide the reverse-strike support 1 and the jack 10 and insert them into the hole 31 in a vertical posture. Also, a plurality of pantograph type jacks 36 are mounted on the outer peripheral surface of the reversed strut 1 at positions facing each other across the axis of the reversed strut 1 .

When the reverse-strike support 1 is inserted to a position where its lower end reaches a predetermined depth in the hole 31, the stopper 15 is supported by the frame 34, and the reverse-strike support 1 is held at that position. The vertical position of the reverse-strike strut 1 is adjusted by a journal jack 37 provided on the base 34 . Next, a plurality of pantograph-type jacks 36 are opened and the jacks 36 are brought into contact with the wall surface of the hole 31 . In a state in which the reverse-strike strut 1 is inserted into the hole 31 to a predetermined depth, the jack 10 is supported by the guide rollers 35, so the reverse-strike strut 1 is positioned vertically apart from the jack 36 and the guide roller 35. It is supported in a vertical position at a certain point. By adjusting the degree of opening of the left and right pantograph type jacks 36 and the position of the guide roller 35, the verticality of the reverse-strike strut 1 is appropriately adjusted to be within a predetermined range. The verticality of the reverse-strike support 1 can be measured using an inclinometer (not shown) attached to the outer peripheral surface of the reverse-strike support 1 .

Next, as shown in FIG. 5(b), a tremie tube 38 is erected in the pit hole 31 with the Yatco 10 attached to the upper end of the reverse-strike strut 1 inserted into the pit hole 31, and the tremie tube 38 is passed through the pit hole 31. Concrete 39 is placed inside the hole 31 from the bottom to a predetermined height. When the concrete 39 is placed inside the hole 31 , the reinforcing bars 32 and the embedded part 3 of the reverse-cast support 1 are buried inside the concrete 39 .

When the concrete 39 placed inside the hole 31 hardens, the reverse-cast pillar 1 is fixed to the hardened concrete 39 at the embedded portion 3, that is, to the cast-in-place concrete pile in which the reinforcing bars 32 are embedded.

In the same procedure, a predetermined number of reversed pillars 1 required for the building are fixed to concrete piles of a predetermined number of holes 31 provided in the ground 30 .

When all of the upside-down pillars 1 are fixed to the hardened concrete (concrete piles) 39 of the corresponding pits 31, the upside-down pillars 1 are supported after backfilling the pits 31, as shown in FIG. At the same time, the ground 30 is excavated to a predetermined depth, and concrete is poured from the tremie pipe 38 to the bottom of the excavated ground to construct the underground part of the building. Work to construct the underground portion 41, such as forming a pressure-resistant board, is advanced.

Here, as shown in FIG. 5(b), after inserting the upside-down support 1 into the hole 31, when concrete 39 is poured into the inside of the downhole 31, the upside-down support 1 has the embedded part 3. Since it is inserted into the concrete 39 before hardening, that is, having fluidity, buoyancy acts on the upside-down strut 1 until the concrete 39 hardens. If the upside-down support 1 receives buoyancy from the concrete 39, the buoyancy may cause it to float, causing a positional deviation such as a decrease in verticality.

On the other hand, in the method of erecting the upside-down struts of this embodiment, the concrete 39 is cast into the hole 31 while the upside-down struts 10 are attached to the upper ends of the upside-down struts 1, and the steel pipes are used as the upside-down struts 10. Since the hollow columnar main body 11 has a hardened cement portion 16 placed in the interior of the main body 11 and a heavy weight is used, the buoyancy received from the concrete 39 by the reverse-cast support 1 is offset by the weight of the yattco 10.例文帳に追加Thus, it is possible to prevent the buoyancy of the reverse-strike strut 1 from rising.

In addition, in the method of erecting the reversed strut of the present embodiment, unlike the conventional method, the inside of the reversed strut 1 is filled with fresh water (tap water) to increase the weight of the reversed strut 1. By using a cement hardened part 16 placed inside the main body part 11 as 10, the uplift due to the buoyancy of the upside down post 1 is prevented, so that the concrete 39 placed in the hole 31 hardens. After the upside-down support 1 is fixed to the concrete pile, it is not necessary to remove fresh water from the inside of the upside-down support 1.例文帳に追加In addition, when removing the Yatko 10 from the reverse-strike strut 1, since the hardened cement portion 16 inside the main body portion 11 is hardened, the hardened cement portion 16 is not removed from the main body portion 11, etc., and the Yatko can be removed. 10 can be easily removed from the counterstrike strut 1 as it is.

In this way, in the method of erecting the reverse-strike support of this embodiment, when the reverse-strike support 1 is erected in the hole 31 provided in the ground 30, the steel pipe is used as the yattco 10 attached to the upper end of the reverse-strike support 1. Since the one having the main body 11 formed in a hollow columnar shape and the cement hardening part 16 placed inside the main body 11 is used, it is possible to remove water without performing complicated draining work. Lifting due to the buoyancy of the striking support 1 can be easily prevented.

In addition, since the cement hardened portion 16 is placed inside the body portion 11, the weight of the yattco 10 is increased. Therefore, the manufacturing cost of the Yatco 10 or the cost required for erecting the reverse-strike support 1 can be reduced.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, the cement-hardened portion 16 may be placed inside the body portion 11 in advance before the Yatco 10 is attached to the upper end of the reverse-stretched strut 1, and the body portion 11 with an empty interior may be placed inside the body portion 11. is attached to the upper end of the upside-down post 1 and the upside-down post 1 is inserted into the hole 31, and before placing the concrete 39 in the hole 31, the cement hardened part 16 is placed inside the main body 11. You may do so. After the main body part 11 with an empty interior is attached to the upper end of the upside down pillar 1 and the upside down upside down pillar 1 is inserted into the hole 31 , cement is added to the inside of the main part 11 before pouring concrete 39 into the hole 31 . When the hardened portion 16 is cast, if concrete is used as the hardened cement portion 16, the hardened cement portion 16 can be formed by diverting the concrete 39 for casting into the hole 31. It is possible to further reduce the manufacturing cost of the Yatco 10 or the cost required for erecting the reverse-strike strut 1 .

In the above-described embodiment, the concrete 39 is poured into the hole 31 after the reverse-cast support 1 is inserted into the hole 31 (first-in method). After installation and before the concrete 39 hardens, the upside-down support 1 may be inserted into the hole 31 (post-installation method).

1 Upside down strut 2 Stud 3 Embedding part 10 Yatko 11 Body part 12 Lower end blocking wall 13 Upper end blocking wall 14 Hanging hook 15 Stopper 16 Cement hardening part 20 Connecting plate 21 Bolt 30 Ground 31 Hole 32 Reinforcing bar 33 Wire 34 Mounting frame 35 Guide roller 36 Jack 37 Journal jack 38 Tremy pipe 39 Concrete 40 Above ground part 41 Underground part

TECHNICAL FIELD The present invention relates to a method for erecting a reverse-strike support and a yatko used for this method.

A reverse construction method is known as a construction method for constructing a building having a ground portion and an underground portion. In the reversed construction method, before excavating the ground to construct the underground structure, the ground is excavated by erecting reversed pillars to support the above-ground part of the building in the pile holes provided in the ground. While constructing the underground structure, construction of the above-ground part on the upside-down pillars can be performed in parallel. As a result, the construction period of the building can be shortened compared to the method of proceeding with the construction of the above-ground part after completing the construction of the underground part.

In such a reverse-casting method, the reverse-casting post is fixed to the cast-in-place concrete pile at the embedded portion by pouring concrete into the pile hole after being inserted into the pile hole (first-in method). Alternatively , after concrete is poured into the pile hole, it is inserted into the concrete and fixed to the cast-in-place concrete pile at the embedded portion (post-installation method). However, until the concrete placed in the pile hole hardens, a buoyant force acts on the upside-down post. There is a risk of misalignment.

In order to deal with this problem, conventionally, when an upside-down pillar is erected in a pile hole provided in the ground, the inside of the upside-down pillar is filled with fresh water (tap water) to increase the weight of the upside-down pillar. A method has been proposed in which the buoyancy force of the reverse-strike strut is prevented from rising (see, for example, Patent Literature 1).

JP-A-2002-54164

However, in the above-described conventional method, after the concrete placed in the pile hole hardens and the upside-down pillar is fixed to the concrete pile, it is necessary to remove the fresh water from the inside of the upside-down pillar, and the work is complicated. There was a problem that

The present invention has been made in view of the above-mentioned problems, and its object is to provide a method of erecting a reverse-strike support and a yattco that can easily prevent the lifting of the reverse-strike support due to the buoyancy of the support. be.

The method of erecting a reverse-struck support of the present invention is a method of erecting a reverse-strike support in which a reverse-strike support is erected in a pile hole provided in the ground, wherein the reverse-strike support is attached to the upper end of the support. A step of inserting into the pile hole, and a step of fixing the embedded portion of the reverse-struck support to the concrete pile by pouring concrete into the pile hole with the yattco attached to the upper end of the reverse-strike support. and, as the yattco, one having a main body formed in a hollow columnar shape from a steel pipe and a cement hardening part placed inside the main body is used.

The Yatko of the present invention is a Yatko that is attached to the upper end of the inversely struck post when the inversely struck post is erected in a pile hole provided in the ground, and is formed of a steel pipe in a hollow columnar shape; and a cement-hardened portion placed inside the main body.

Advantageous Effects of Invention According to the present invention, it is possible to provide a method for erecting a reversed strut and a yattco that can easily prevent the reversed strut from floating due to buoyancy.

FIG. 10 is a front view of a state in which the jacks of the reverse-strike support used in the method for erecting the reverse-strike support according to one embodiment of the present invention are attached. FIG. 2 is a cross-sectional view showing the details of the yatko shown in FIG. 1; FIG. 3 is a cross-sectional view taken along line AA in FIG. 2; (a) is a diagram showing a pile hole provided in the ground, and (b) is a diagram showing a state in which a reinforcing bar is built into the pile hole shown in (a) of the figure. (a) is a diagram showing a state in which an upside -down post is inserted into a pile hole, and (b) is a diagram showing a state in which concrete is poured into the pile hole into which the upside-down support is inserted. FIG. 10 is a diagram showing a state in which an above-ground portion is being constructed while an underground portion is being constructed after the reverse-strike support is fixed to the concrete pile.

Hereinafter, a method for erecting a reversed strut and a yattco according to an embodiment of the present invention will be described in detail with reference to the drawings.

The reverse driven support 1 shown in FIG. 1 is built into a pile hole provided in the ground in the method for erecting a reverse driven support according to one embodiment of the present invention.

The upside-down strut 1 is formed in a straight columnar shape with a predetermined length from a steel pipe with a rectangular cross section. The inside of the counterstrike support 1 is hollow. On the outer peripheral surface of the lower part of the upside down pillar 1, a plurality of studs 2 for engaging the upside down pillar 1 with the mat slab that constitutes the underground structure are arranged vertically and horizontally at predetermined intervals. Fixed. In addition, in FIG. 1, only one stud 2 is labeled for convenience. A part below the part where the plurality of studs 2 of the reverse-strike strut 1 are fixed forms an embedded part 3. - 特許庁The embedded portion 3 is a portion of the reverse-cast support 1 that is inserted into concrete placed in a pile hole and fixed to a concrete pile in which the concrete has hardened.

In this embodiment, the upside-down strut 1 is formed entirely from a steel pipe with a rectangular cross section from the top end to the bottom end. The shape or configuration can be changed as appropriate, such as a configuration formed of so-called cross H-shaped steel.

When the upside-down post 1 is erected in a pile hole provided in the ground, a yattco (temporary pile) 10 according to one embodiment of the present invention is attached to its upper end.

As shown in FIGS. 2 and 3, the Yatko 10 has a straight hollow columnar body 11 of a predetermined length made of a steel pipe with a rectangular cross section having the same dimensions as the upside-down strut 1 . The Yatko 10 is fixed to the upper end of the reverse-strike strut 1 at the lower end of the body portion 11 so that the four sides overlap vertically. The attachment structure of the Yatko 10 to the upper end of the reversed strut 1 is, for example, as shown in FIG. Various structures such as a structure in which the connection plate 20 is fixed with a bolt 21 and connected to each other can be adopted as long as the Yatco 10 can be detachably attached to the reverse-strike strut 1 .

A lower end closing wall 12 that closes the lower end of the main body portion 11 is fixed to the lower end of the main body portion 11, and an upper end closing wall 13 that closes the upper end of the main body portion 11 is fixed to the upper end of the main body portion 11. A pair of hanging hooks 14 are fixed to the upper surface of the upper end closing wall 13 . A plurality of wing-like stoppers 15 are fixed to the outer peripheral surface of the main body 11 to prevent the yattco 10 from falling into the pile hole.

The Yatco 10 of this embodiment has a cement hardened portion 16 placed inside the body portion 11 . That is, the Yatco 10 of the present embodiment has a configuration in which a cement hardened portion 16 is filled inside a main body portion 11 formed of a steel pipe in a hollow columnar shape. The hardened cement portion 16 is filled inside the main body portion 11 before hardening, and is integrated with the main body portion 11 by hardening inside the main body portion 11 . Due to such a configuration, the Yatco 10 of the present embodiment is heavier than the conventional Yatco having a hollow interior.

The hardened cement portion 16 is obtained by hardening cement by mixing liquid such as water and aggregate. As the cement hardening part 16, for example, concrete hardened by mixing cement with sand (fine aggregate), gravel (coarse aggregate), and a liquid such as water, and cement with sand (fine aggregate). Mortar and cement obtained by mixing and hardening a liquid such as water, and soil cement obtained by mixing and hardening a liquid such as soil (fine aggregate) and water can be used. The hardened cement portion 16 may contain various additives in addition to the aggregate and liquid. Alternatively, the hardened cement portion 16 may be obtained by hardening a mixture of cement and a liquid such as water without adding aggregate.

The amount of the hardened cement portion 16 cast inside the main body portion 11 is the total weight of the upside-down post 1 and the yattco 10, which is equal to the embedded portion 3 of the upside-down post 1 in the concrete placed in the pile hole. The amount is set to be larger than the buoyant force acting on the reverse striking strut 1 when the is inserted.

Next, when constructing a building having an aboveground part and an underground part by the reversed construction method, the reversed pillars 1 are erected in the pile holes provided in the ground by the reversed pillar erection method of the present embodiment. I will explain the procedure for loading.

First, as shown in FIG. 4( a ), a drilling device such as a drill is used to drill a predetermined depth at the planned erection position of the reversed strut 1 on the ground 30 of the construction site where the building is constructed by the reversed construction method. excavate the pile hole 31 of . In the illustrated case, the shape of the pile hole is a cylinder whose diameter increases only at the bottom, but the shape can be changed as appropriate. Next, as shown in FIG. 4B, a reinforcing bar 32 is erected at a predetermined position on the bottom side of the pile hole 31 .

Next, as shown in FIG. 5( a ), a crane (not shown) is attached to a crane (not shown) by using a wire 33 connected to the hanging hook 14 of the YATCO 10 at the construction site. ) and inserted into the pile hole 31 from the lower end side. At this time, a pedestal 34 is installed above the opening of the pile hole 31 , and guide rollers 35 provided on the pedestal 34 guide the reverse driven support 1 and the yattco 10 and insert them into the pile hole 31 in a vertical posture. Also, a plurality of pantograph type jacks 36 are mounted on the outer peripheral surface of the reversed strut 1 at positions facing each other across the axis of the reversed strut 1 .

When the reversed strut 1 is inserted to a position where the lower end thereof reaches a predetermined depth in the pile hole 31, the stopper 15 is supported by the frame 34, and the reversed strut 1 is held at that position. The vertical position of the reverse-strike strut 1 is adjusted by a journal jack 37 provided on the base 34 . Next, a plurality of pantograph-type jacks 36 are opened and the jacks 36 are brought into contact with the wall surfaces of the pile holes 31 . In a state in which the reverse driven post 1 is inserted into the pile hole 31 to a predetermined depth, the jack 10 is supported by the guide rollers 35. It is supported in a vertical position at a certain point. By adjusting the degree of opening of the left and right pantograph type jacks 36 and the position of the guide roller 35, the verticality of the reverse-strike strut 1 is appropriately adjusted to be within a predetermined range. The verticality of the reverse-strike support 1 can be measured using an inclinometer (not shown) attached to the outer peripheral surface of the reverse-strike support 1 .

Next, as shown in FIG. 5(b), a tremie tube 38 is erected in the pile hole 31 with the Yatco 10 attached to the upper end of the reverse-strike support 1 inserted into the pile hole 31, and the tremie tube 38 is passed through the pile hole 31. Concrete 39 is placed inside the pile hole 31 from the bottom to a predetermined height. When the concrete 39 is placed inside the pile hole 31 , the reinforcing bars 32 and the embedded portion 3 of the reverse-cast support 1 are buried inside the concrete 39 .

When the concrete 39 placed inside the pile hole 31 hardens, the reverse-cast pillar 1 is fixed to the hardened concrete 39, that is, the cast-in-place concrete pile in which the reinforcing bars 32 are embedded in the embedded portion 3.

In the same procedure, a predetermined number of reversed struts 1 required for the building are fixed to respective concrete piles of a predetermined number of pile holes 31 provided in the ground 30 .

When all the upside-down pillars 1 are fixed to the hardened concrete (concrete piles) 39 of the corresponding pile holes 31, the upside-down pillars 1 are supported after backfilling the pile holes 31, as shown in FIG. At the same time, the ground 30 is excavated to a predetermined depth, and concrete is poured from the tremie pipe 38 to the bottom of the excavated ground to construct the underground part of the building. Work to construct the underground portion 41, such as forming a pressure-resistant board, is advanced.

Here, as shown in FIG. 5B, after inserting the upside-down support 1 into the pile hole 31, when concrete 39 is poured into the inside of the upside-down support 1, the embedded part 3 of the upside-down support 1 is Since it is inserted into the concrete 39 before hardening, that is, having fluidity, buoyancy acts on the upside-down strut 1 until the concrete 39 hardens. If the upside-down support 1 receives buoyancy from the concrete 39, the buoyancy may cause it to float, causing a positional deviation such as a decrease in verticality.

On the other hand, in the method of erecting the upside-down struts of this embodiment, concrete 39 is poured into the pile hole 31 while the upside-down strut 10 is attached to the upper end of the upside-down strut 1, and a steel pipe is used as the upside-down strut 10. Since the hollow columnar main body 11 has a hardened cement portion 16 placed in the interior of the main body 11 and a heavy weight is used, the buoyancy received from the concrete 39 by the reverse-cast support 1 is offset by the weight of the yattco 10.例文帳に追加Thus, it is possible to prevent the buoyancy of the reverse-strike strut 1 from rising.

In addition, in the method of erecting the reversed strut of the present embodiment, unlike the conventional method, the inside of the reversed strut 1 is filled with fresh water (tap water) to increase the weight of the reversed strut 1. By using a cement hardening part 16 cast inside the main body part 11 as 10, it is possible to prevent the uplift due to the buoyancy of the reversed support 1, so that the concrete 39 cast in the pile hole 31 hardens. After the upside-down support 1 is fixed to the concrete pile, it is not necessary to remove fresh water from the inside of the upside-down support 1.例文帳に追加In addition, when removing the Yatko 10 from the reverse-strike strut 1, since the hardened cement portion 16 inside the main body portion 11 is hardened, the hardened cement portion 16 is not removed from the main body portion 11, etc., and the Yatko can be removed. 10 can be easily removed from the counterstrike strut 1 as it is.

As described above, in the method of erecting the reverse-strike support of the present embodiment, when the reverse-strike support 1 is erected in the pile hole 31 provided in the ground 30, the yattco 10 attached to the upper end of the reverse-strike support 1 is made of a steel pipe. Since the one having the main body 11 formed in a hollow columnar shape and the cement hardening part 16 placed inside the main body 11 is used, it is possible to remove water without performing complicated draining work. Lifting due to the buoyancy of the striking support 1 can be easily prevented.

In addition, since the cement hardened portion 16 is placed inside the body portion 11, the weight of the yattco 10 is increased. Therefore, the manufacturing cost of the Yatco 10 or the cost required for erecting the reverse-strike support 1 can be reduced.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, the cement-hardened portion 16 may be placed inside the body portion 11 in advance before the Yatco 10 is attached to the upper end of the reverse-stretched strut 1, and the body portion 11 with an empty interior may be placed inside the body portion 11. is attached to the upper end of the reverse-strike strut 1 and the reverse-strike strut 1 is inserted into the pile hole 31, and before placing the concrete 39 in the pile hole 31, the cement hardening part 16 is placed inside the main body 11. You may do so. After the body part 11 with an empty interior is attached to the upper end of the reverse-struck support 1 and the reverse-strike support 1 is inserted into the pile hole 31 , cement is added to the inside of the body part 11 before placing concrete 39 in the pile hole 31 . When the hardened part 16 is cast, if concrete is used as the cement hardened part 16, the cement hardened part 16 can be formed by diverting the concrete 39 for driving into the pile hole 31. It is possible to further reduce the manufacturing cost of the Yatco 10 or the cost required for erecting the reverse-strike strut 1 .

Further, in the above-described embodiment, after the reverse-cast support 1 is inserted into the pile hole 31, the concrete 39 is poured into the pile hole 31 (first-in method). After installation and before the concrete 39 hardens, the reverse-strike support 1 may be inserted into the pile hole 31 (post-insertion construction method).

1 Upside-down strut 2 Stud 3 Embedment part 10 Yatko 11 Body part 12 Lower end blocking wall 13 Upper end blocking wall 14 Hanging hook 15 Stopper 16 Cement hardening part 20 Connecting plate 21 Bolt 30 Ground 31 Pile hole 32 Reinforcement bar 33 Wire 34 Mounting frame 35 Guide roller 36 Jack 37 Journal jack 38 Tremy pipe 39 Concrete 40 Above ground part 41 Underground part

Claims (2)

A method for erecting a reverse-struck support for erecting a reverse-strike support in a hole provided in the ground,
a step of inserting the reverse-strike strut having a yattco attached to its upper end into the hole;
A step of casting concrete into the hole with the yattco attached to the upper end of the reverse-strike support, and fixing the embedded portion of the reverse-strike support to a concrete pile;
As the aforementioned Yatko,
a main body formed of a steel pipe in a hollow columnar shape;
and a hardened cement portion placed inside the main body portion. A jack that is attached to the upper end of the reverse-strike support when the reverse-strike support is erected in the hole provided in the ground,
a main body formed of a steel pipe in a hollow columnar shape;
and a hardened cement portion placed inside the body portion.

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