JP2022077364A - Pillar adjustment mechanism and pillar adjustment method - Google Patents

Abstract

To ensure the construction accuracy of columns that are erected while being fixed to ready-made piles.SOLUTION: The present invention comprises: a positioning trestle 40 that clamps a column 20 fixed to a pile head of a ready-made pile in a state where a column adjustment mechanism ready-made pile (pile 10) is inserted into a pile hole 10H, and determines a horizontal position and a vertical position of the column 20; and a bag 30 that is expanded while being held between the ready-made pile and the pile hole 10H to adjust the inclination of the column 20.SELECTED DRAWING: Figure 4

Description

The present invention relates to a pillar adjusting mechanism and a pillar adjusting method.

The following Patent Document 1 shows a pile body construction method.

Japanese Unexamined Patent Publication No. 2017-8490

In the pile construction method of Patent Document 1, the position or inclination of the pile and the pillar is adjusted by injecting the injection material into the bag-shaped body installed on the outer peripheral surface of the pile.

However, it is difficult to finely adjust the position or inclination of the pillar only by adjusting the amount of the injection material to be injected into the bag-shaped body, and it is difficult to secure the construction accuracy of the pillar.

In consideration of the above facts, an object of the present invention is to ensure the construction accuracy of a pillar erected while being fixed to a ready-made pile.

The pillar adjusting mechanism according to claim 1 is a positioning stand that sandwiches a pillar fixed to the pile head of the ready-made pile in a state where the ready-made pile is inserted into the pile hole and positions the horizontal position and the vertical position of the pillar. It is provided with a bag body that expands while being sandwiched between the ready-made pile and the pile hole to adjust the inclination of the pillar.

In the column adjusting mechanism of claim 1, the horizontal position and the vertical position of the column fixed to the pile head of the ready-made pile are positioned by the positioning stand. Further, the inclination of the pillar is adjusted by expanding the bag body sandwiched between the ready-made pile and the pile hole. As a result, it is possible to secure the construction accuracy of the pillars that are erected while being fixed to the ready-made piles.

The pillar adjusting mechanism according to claim 2 is the pillar adjusting mechanism according to claim 1, wherein the ready-made pile is hollow, and the pile head of the ready-made pile is provided with a mud draining mechanism.

In the pillar adjusting mechanism of claim 2, the ready-made pile is hollow. Therefore, when a ready-made pile is inserted into the pile hole, mud is filled in the hollow portion from the tip of the pile. Here, since the pile head is provided with a mud draining mechanism, the mud and the like filled in the hollow portion are discharged from the pile head. As a result, the hollow portion is easily filled with cement milk and the strength of the pile is easily ensured, as compared with the configuration in which mud is not discharged from the pile head.

The method for adjusting the pillar according to claim 3 includes a step of inserting a ready-made pile in which the pillar is fixed to the pile head into the pile hole, and a step of sandwiching the pillar with a positioning stand and positioning the horizontal position and the vertical position of the pillar. The step of expanding the bag body sandwiched between the ready-made pile and the pile hole to adjust the inclination of the pillar is provided.

In the method of adjusting the pillar according to claim 3, the horizontal position and the vertical position of the pillar fixed to the pile head of the ready-made pile are positioned by the positioning stand. Further, the inclination of the pillar is adjusted by expanding the bag body sandwiched between the ready-made pile and the pile hole. As a result, it is possible to secure the construction accuracy of the pillars that are erected while being fixed to the ready-made piles.

According to the present invention, it is possible to ensure the construction accuracy of a pillar that is erected while being fixed to a ready-made pile.

(A) is an elevation view which shows the joint part of the pillar and the pile to which the adjustment mechanism of the pillar which concerns on embodiment of this invention is applied, and (B) is a sectional view taken along line BB in (A). It is an elevation view which shows the positioning stand in the adjustment mechanism of a pillar which concerns on embodiment of this invention. It is a top view which shows the positioning stand in the adjustment mechanism of a pillar which concerns on embodiment of this invention. (A) is an elevation view showing a state in which a pile hole for inserting a pile is formed in the method of adjusting a pillar according to an embodiment of the present invention, and (B) is a pile hole in which a pile to which a pillar is fixed is formed. It is an elevation view which shows the state which it is inserted into, (C) is an elevation view which shows the state which adjusts the plane position of a pillar using a positioning pedestal, (D) intersects (C). It is an elevation view which shows the state which adjusts the plane position in a direction. (A) is an elevation view showing a state in which the inclination of the pillar is adjusted by using a bag in the method of adjusting the pillar according to the embodiment of the present invention, and (B) is a state in which the positioning pedestal is removed. It is an elevation view which shows.

Hereinafter, the column adjusting mechanism and the column adjusting method according to the embodiment of the present invention will be described with reference to the drawings. The components shown by the same reference numerals in the drawings mean that they are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of components may exist. In addition, explanations may be omitted for overlapping configurations and reference numerals in the drawings. The present invention is not limited to the following embodiments, and can be carried out with appropriate modifications such as omitting or replacing the configuration within the scope of the object of the present invention.

In each figure, the directions indicated by the arrows X and Y are along the horizontal plane and are orthogonal to each other. Further, the direction indicated by the arrow Z is a direction along the vertical direction (vertical direction). It is assumed that the directions indicated by the arrows X, Y, and Z in each figure coincide with each other.

The pillar adjusting mechanism according to the embodiment of the present invention is applied to the pillar 20 which is erected while being fixed to the pile 10 shown in FIGS. 1 (A) and 1 (B).

(Piles and pillars)
The pile 10 is, for example, a ready-made concrete pile, and the inside is formed in a hollow cylindrical shape. A pillar 20 is bolted to the pile head of the pile 10 via a base plate 22. The pile 10 may be a steel pipe pile or the like.

The pillar 20 is a substantially cross-shaped steel pillar formed by welding a T-shaped steel to a web of H-shaped steel, and a base plate 22 is welded to the lower end portion. The pillar 20 is, for example, a structural pillar used in the reverse striking method. The column base portion of the column 20 is inserted into the pile hole 10H together with the pile 10 at the stage of inserting the pile 10 into the pile hole 10H (see FIG. 2 and the like) described later.

The base plate 22 is an annular flat plate bolted to the pile head of the pile 10. Flange 20F of H-shaped steel and T-shaped steel forming the pillar 20 is welded to the base plate 22.

Since the base plate 22 is formed in an annular shape, when the pile 10 is inserted into the pile hole 10H described later, mud or the like filled in the hollow portion of the pile 10 is discharged from the pile head. That is, the base plate 22 also serves as a mud draining mechanism for the pile 10.

The inside corner formed by the base plate 22 and the flange 20F is reinforced by the reinforcing rib 24. The reinforcing rib 24 is a steel plate welded to the base plate 22 and the flange 20F, and is arranged in the in-plane direction along the vertical direction. Three reinforcing ribs 24 are welded to each flange 20F.

If the reinforcing rib 24 can support the axial force acting on the column 20 and the column 20, the base plate 22 and the flange 20F of the column 20 may be arranged apart from each other so as not to be welded to each other. By separating the base plate 22 and the flange 20F of the pillar 20, a space can be secured at the pile head and the mud drainage efficiency can be improved.

(Bag body)
The bag body 30 is a bag jack fixed to the outer peripheral surface of the pile 10. The bag bodies 30 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the pile 10. At least three or more bag bodies 30 are arranged in the circumferential direction, but in the present embodiment, four are arranged.

The bag body 30 is fixed to the outer peripheral surface of the pile 10 by using, for example, curing tape (not shown). The curing tape is wound along the circumferential direction of the stake 10 so as to surround the stake 10 and the four bag bodies 30. As a result, when the pile 10 is inserted into the pile hole 10H (see FIG. 2 and the like), it is possible to prevent the bag body 30 from rolling up from the outer peripheral surface of the pile 10 due to the mud and groundwater in the pile hole 10H.

As an example, the cloth forming the bag body 30 is made of a non-stretchable woven fabric such as polyester fiber. Further, this fiber is woven so that air and the water component of cement milk can pass through, but the cement component of cement milk cannot easily pass through.

In the bag body 30, the end portion of the pile 10 arranged on the pile head side is partially released, and the injection pipe 32 is inserted into the opened portion. The injection pipe 32 is, for example, a flexible hose made of vinyl chloride, and has a strength that does not collapse even when pressure is applied from unhardened cement milk or mud. Further, the injection pipe 32 is arranged along the pillar 20. As the material of the injection pipe 32, a metal pipe such as an iron pipe may be used.

Cement milk is injected into the bag body 30 from the injection pipe 32. As a result, cement milk is filled inside the bag body 30, and the bag body 30 expands due to the filled cement milk. As the bag body 30 expands, the bag body 30 becomes thicker along the radial direction of the pile 10. As the bag body 30 expands, the curing tape that fixes the bag body 30 to the pile 10 breaks or stretches to follow the deformation of the bag body 30.

Here, "expansion" means that the internal volume of the bag body 30 is increased, not that the bag body 30 is expanded. However, when the bag body 30 is made of elastic woven fabric, the bag body is stretched and the volume inside the bag body 30 is increased.

As shown by the alternate long and short dash line, a plurality of bag bodies 30 may be stacked and used. By stacking and arranging a plurality of bag bodies 30 in the radial direction of the pile 10, the thickness (total thickness value) of the bag body 30 at the time of expansion can be increased as compared with the case where the bag bodies 30 are not stacked.

When a plurality of bag bodies 30 are stacked, it is preferable that the injection tube 32 to be inserted into the outer bag body 30 (the side farther from the pile 10) is bent more than the injection tube 32 into which the inner bag body 30 is inserted. As a result, the load on the injection tube 32 due to the expansion of the bag body 30 can be reduced.

(Positioning stand)
The positioning pedestal 40 (hereinafter referred to as pedestal 40) shown in FIGS. 2 and 3 is a pedestal arranged across the pile hole 10H into which the pile 10 (see FIG. 1) is inserted, and has a main body portion 40A and a positioning portion. It is formed with 40B. In FIG. 3, the positioning portion 40B is shown by a two-dot chain line.

The main body portion 40A is arranged between the jack 42 mounted on the ground G, the pedestal 44 mounted on the jack 42, the frame body 46 mounted on the pedestal 44, and the pedestal 44 and the frame body 46. It is equipped with a jack 48.

The jack 42 is an example of a giraffe jack, and adjusts the vertical position (vertical position) and inclination of the pedestal 44 mounted on the jack 42.

As shown in FIG. 3, the pedestal 44 is formed by combining H-shaped steels in a grid shape, and a frame body 46 is placed above the pedestal 44. Further, receiving members 44A are joined to both ends of the H-shaped steel forming the pedestal 44.

The frame body 46 is formed by combining H-shaped steels in a frame shape, and is arranged so as to be relatively movable (in other words, not fixed) with respect to the pedestal 44 when the jack 48 is not used. In the following description, in the frame body 46, the pair of members along the X direction is referred to as the first direction frame 46A, and the pair of members along the Y direction is referred to as the second direction frame 46B.

The jack 48 is taken as a journal jack as an example, and is arranged between the receiving member 44A on the pedestal 44 and the frame body 46 along both the X direction and the Y direction. The jack 48 positions the frame body 46 mounted on the pedestal 44. That is, the relative positional relationship between the pedestal 44 and the frame body 46 along the horizontal direction is adjusted by the jack 48.

The positioning unit 40B includes a first-direction adjusting member 50A and a second-direction adjusting member 50B.

The first direction adjusting member 50A is an H-shaped steel arranged along the Y direction and bridged over two first direction frames 46A in the frame body 46. Further, two first-direction adjusting members 50A are arranged with the pillar 20 interposed therebetween.

The second direction adjusting member 50B is an H-shaped steel or angle steel arranged along the X direction and bridged over the two first-direction adjusting members 50A. Further, two second direction adjusting members 50B are arranged so as to sandwich the pillar 20.

(How to adjust the pillars)
The method of adjusting the pillar according to the embodiment of the present invention positions the horizontal position and the vertical position of the pillar 20 which is erected while being fixed to the pile 10 shown in FIGS. 1 (A) and 1 (B). , Is a method of adjusting the inclination of the pillar 20.

In this method of adjusting the pillars, as shown in FIG. 4A, a pile hole 10H is formed in the ground G prior to the construction of the pile 10 and the pillar 20. At the same time as the formation of the pile hole 10H, the root hardening liquid is injected into the pile hole 10H.

It is preferable to add an admixture to the root hardening liquid to reduce the initial shear strength of the root hardening liquid. As a result, it is possible to reduce the resistance force that the pile 10 receives from the uncured root hardening liquid when the pillar 20 is positioned and the inclination is adjusted, which will be described later.

Next, as shown in FIG. 4B, the gantry 40 is installed across the pile hole 10H, and the vertical position and inclination of the pedestal 44 are adjusted by using the jack 42. After adjusting the vertical position and inclination of the pedestal 44, the pile 10 having the pillar 20 fixed to the pile head is inserted into the pile hole 10H, and the pile 10 and the pillar 20 are installed at a predetermined height. The pillar 20 is lifted by a crane, and by maintaining this state, the height position of the pillar 20 is fixed.

A temporary bracket or the like (not shown) may be fixed to the pillar 20 and the bracket may be locked to the main body 40A of the gantry 40 to position the vertical position of the pillar 20. In this case, the rigidity of the gantry 40 is ensured so that the gantry 40 is not deformed by the load of the pile 10 and the pillar 20. In addition, the ground G is sufficiently leveled and solidified so that the ground G does not sink due to the load of the pile 10 and the pillar 20.

After the pile 10 and the pillar 20 are installed at a predetermined height, as shown in FIG. 4C, the first direction adjusting member 50A is bridged over the first direction frame 46A (see FIG. 3) of the gantry 40. The pillar 20 is sandwiched by the first direction adjusting member 50A, and the position of the pillar 20 in the X direction is positioned. The first direction adjusting member 50A is fixed to the main body portion 40A of the gantry 40 by using a fastening metal fitting or the like.

The position for fixing the first direction adjusting member 50A is marked in advance on the first direction frame 46A of the frame body 46. This marking is preferably performed before the pile 10 is inserted into the pile hole 10H.

Next, as shown in FIG. 4D, the second direction adjusting member 50B is bridged over the first direction adjusting member 50A. The pillar 20 is sandwiched by the second direction adjusting member 50B, and the position of the pillar 20 in the Y direction is positioned. The second direction adjusting member 50B is fixed to the first direction adjusting member 50A by using a fastening metal fitting or the like.

The position for fixing the second direction adjusting member 50B is marked on the first direction adjusting member 50A in advance. This marking is preferably performed before the pile 10 is inserted into the pile hole 10H.

In this way, the pillar 20 fixed to the pile 10 is positioned in a plane position by the first direction adjusting member 50A and the second direction adjusting member 50B. After positioning the plane position of the pillar 20 by the first direction adjusting member 50A and the second direction adjusting member 50B, the plane position can be finely adjusted appropriately by moving the frame body 46 using the jack 48. can.

After the vertical position and the planar position of the pillar 20 are positioned, cement milk is injected into the bag body 30 as shown in FIG. 5 (A). The bag body 30 expands when cement milk is injected and comes into contact with the outer peripheral surface of the pile 10 and the hole wall of the pile hole 10H. The bag body 30 presses the stake 10 and moves the stake 10 by further injecting cement milk.

Here, the plane position of the pillar 20 fixed to the pile 10 is fixed by the first direction adjusting member 50A and the second direction adjusting member 50B. Therefore, when the bag body 30 presses the pile 10, the pile 10 and the pillar 20 move so as to rotate around the positions of the first direction adjusting member 50A and the second direction adjusting member 50B. As a result, the inclinations of the pile 10 and the pillar 20 are adjusted. The inclination of the pile 10 and the pillar 20 is measured by installing an inclinometer (not shown) on the pillar 20.

If the plane position of the pillar 20 shifts due to this inclination adjustment, the plane position can be finely adjusted by using the jack 48 as described above.

Although a plurality of bag bodies 30 are provided in the circumferential direction of the pile 10, it is not necessary to inflate all of them. Only the bag body 30 necessary for adjusting the inclination of the pile 10 and the pillar 20 needs to be expanded by the required amount. By hardening the cement milk injected into the bag body 30, the pile 10 and the pillar 20 are stably held.

After adjusting the inclinations of the pile 10 and the pillar 20, as shown in FIG. 5B, the gantry 40 is removed and cement milk is injected into the pile hole 10H. At the time of this injection, mud is discharged from the hollow portion of the pile 10 and cement milk is injected. Since cement is injected into the bag body 30, the bag body 30 may be left behind. Further, cement milk may be injected into the pile hole 10H before the gantry 40 is removed.

(Action and effect)
In the pillar adjusting mechanism according to the embodiment of the present invention, the horizontal position and the vertical position (vertical position) of the pillar 20 fixed to the pile head of the pile 10 which is a ready-made pile are positioned by the gantry 40. Further, the inclination of the pillar 20 is adjusted by expanding the bag body 30 sandwiched between the pile 10 and the pile hole 10H. As a result, the construction accuracy of the pillar 20 that is erected while being fixed to the pile 10 can be ensured.

Further, in the column adjusting mechanism according to the embodiment of the present invention, the pile 10 is hollow. Therefore, when the pile 10 is inserted into the pile hole, mud is filled in the hollow portion from the tip of the pile 10. Here, since the pile head is provided with the annular base plate 22 as a mud draining mechanism, the mud or the like filled in the hollow portion is pushed out from below by cement milk having a heavier specific gravity than the mud, and the pile head. Is discharged from. As a result, the hollow portion is easily filled with cement and the strength of the pile 10 is easily secured as compared with the configuration in which mud is not discharged from the pile head.

The base plate 22 does not necessarily have to be formed in an annular shape. Even if the base plate 22 is not formed in an annular shape, mud can be discharged from the hollow portion of the pile 10 by forming an insertion hole for inserting a hose for sucking mud, for example, as a mud draining mechanism. Further, such a mud draining mechanism does not necessarily have to be provided. The pillar adjusting mechanism and adjusting method of the present invention can be carried out regardless of the presence or absence of the mud draining mechanism.

10 piles (ready-made piles)
10H Pile hole 20 Pillar 22 Base plate (mud drainage mechanism)
30 Bag body 40 Positioning stand

Claims (3)

With the ready-made pile inserted into the pile hole, a positioning stand that sandwiches a pillar fixed to the pile head of the ready-made pile and positions the horizontal and vertical positions of the pillar, and
A bag body that expands while being sandwiched between the ready-made pile and the pile hole to adjust the inclination of the pillar, and
Pillar adjustment mechanism with. The ready-made pile is hollow and
The pile head of the ready-made pile is equipped with a mud drainage mechanism.
The pillar adjusting mechanism according to claim 1. The process of inserting a ready-made pile with a pillar fixed to the pile head into the pile hole,
The process of sandwiching the pillar with a positioning stand and positioning the horizontal and vertical positions of the pillar, and
A step of expanding the bag body sandwiched between the ready-made pile and the pile hole to adjust the inclination of the pillar, and
How to adjust the pillars with.

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