JP4615102B2 - Steel pipe column erection method and cast-in-place pile head treatment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel pipe column erection method and a pile head treatment method for cast-in-place piles therefor, and in particular, a steel pipe column such as a concrete-filled steel pipe column or the like on a pile head top surface from which extra portions of cast-in-place piles are removed is simplified. In the steel pipe column erection method to enable accurate erection by simple means, and in its pre-process, the extra pile portion of cast-in-place piles is removed by simple means, and the pile head top surface is arranged The present invention relates to a pile head processing method for cast-in-place piles so that they can be formed.
[0002]
[Prior art]
Conventionally, when building structures such as buildings and bridges, cast-in-place piles constructed by excavating a pile hole with the required diameter and depth, building a reinforcing bar in this pile hole, and placing concrete in it. A method of integrating cast-in-place piles and steel pipe columns by building steel pipe columns (referred to as “steel pipe columns” in this specification) on the top and placing concrete in the upper part is used. Yes.
[0003]
By the way, in this construction method, since the accuracy of steel pipe column installation affects the accuracy of buildings such as buildings and bridges, steel pipes such as concrete-filled steel pipe columns on the pile head top surface from which the extra piles of cast-in-place piles have been removed. It is necessary to build the column accurately while adjusting the center position and height of the steel pipe column, but conventionally there is no simple adjustment means for this, and it takes time to build the steel pipe column, and the construction period is long. There was a problem of prolonged.
[0004]
In addition, in cast-in-place piles, removal of surplus parts that become poor concrete due to inclusion of slime is generally mechanically crushed and removed with a breaker, etc., but surplus in the pile head steel pipe. Since it is virtually impossible to remove the part and form a well-built pile head top surface, conventionally, when placing cast-in-place pile concrete, the concrete in the pile head steel pipe is converted to good quality concrete. Until then, bad concrete containing slime was overflowed from the pile head steel pipe.
For this reason, it is necessary to install the steel pipe column in accordance with the casting of the cast-in-place pile, and to complete the installation of the steel pipe column before the concrete in the pile head steel pipe is hardened. There was a problem that the degree of freedom in each of the concrete placing process and the steel pipe column building process was lost.
[0005]
[Problems to be solved by the invention]
In view of the problems of the conventional steel pipe column erection method, the first invention provides a steel tube column such as a concrete-filled steel tube column on a pile top surface from which the surplus portion of the cast-in-place pile has been removed by simple means. A first object is to provide a steel pipe column erection method that enables accurate erection.
[0006]
In addition, in view of the problems of the pile head treatment method for the cast-in-place pile in the previous process of the conventional steel pipe column erection method, the second invention is a cast-in-place pile in the previous process of the steel pipe column erection method. It is a second object of the present invention to provide a pile head treatment method for cast-in-place piles so that the excess pile portion can be removed by simple means to form a well-prepared pile head top surface.
[0007]
[Means for Solving the Problems]
In order to achieve the first object, the steel pipe column erection method according to the first aspect of the present invention is to form an anchor drilling hole at the center position where the steel pipe column on the top surface of the pile from which the surplus portion of the cast-in-place pile is removed is built. In addition, a steel pipe column in which an anchor in which an adjustment plate is disposed so as to be height-adjustable by a screw is installed in the anchor drilling hole, and a pile core guiding member is disposed in the center position of the lower end via an end plate, The center position is adjusted by the anchor and the pile core guiding member, and the steel pipe column is hung from above and placed on the adjustment plate via an end plate.
[0008]
In this steel pipe column erection method, an anchor hole is formed at the center position where the steel pipe column on the top of the pile is removed, and the height of the anchor hole is adjusted by a screw. While installing the anchor with the adjustment plate arranged as possible, and adjusting the center position of the steel pipe column with the pile core guiding member disposed through the end plate at the center position of the lower end by the anchor and the pile core guiding member, The steel pipe column is suspended from above and placed on the adjustment plate via the end plate, so the steel pipe column can be accurately adjusted while adjusting the center position and height of the steel pipe column by simple means. Can be built.
[0009]
In this case, an anchor hole is formed by temporarily installing a center position indicating member for indicating the center position of the steel pipe column on the top of the pile from which the extra pile portion of the cast-in-place pile is removed, and the center position indicating member An anchor can be installed in support of the anchor.
[0010]
As a result, the anchor drilling hole, which was difficult to be formed at the predetermined position due to the swing of the bid due to the unevenness of the pile head top surface and the vibration of the rock drill itself, is accurately formed with reference to the temporary center position indicating member. In addition, the anchor can be accurately installed by supporting the anchor while maintaining the verticality until the resin mortar or the like used for fixing the anchor is cured by the center position indicating member.
[0011]
Moreover, the vertical degree of a steel pipe column can be adjusted by arrange | positioning the adjuster which adjusts the space | interval between a pile head steel pipe and a steel pipe column in several places of the upper end part of a pile head steel pipe.
[0012]
Thereby, it is possible to easily adjust the verticality of the steel pipe column that is accurately built while adjusting the center position and height.
[0013]
In order to achieve the second object, the pile head processing method of the cast-in-place pile according to the second aspect of the present invention includes a pile head steel pipe in which at least the lower end edge is in sliding contact with the inner peripheral surface of the pile head steel pipe, A pile head removal guide with an expansion crushing agent arranged approximately horizontally at the position of the small diameter barrel is installed at the position of the small diameter barrel, and after placing concrete, the pile head is removed by the action of the expansion crushing agent. The concrete is characterized in that the concrete is statically crushed at the position of the small-diameter trunk of the removal guide, and the excess pile portion of the cast-in-place pile is removed together with the pile head removal guide.
[0014]
The pile head processing method for cast-in-place piles is that the lower end edge of the pile head steel pipe is in sliding contact with the inner peripheral surface of the pile head steel pipe, and there is a small diameter trunk in the middle. A pile head removal guide with an expansion crushing agent placed almost horizontally on the ground, and after placing the concrete, the concrete is statically placed at the position of the small-diameter trunk of the pile head removal guide by the action of the expansion crushing agent. Crushing and removing the extra portion of the cast-in-place pile together with the pile head removal guide, so it is possible to statically remove the extra portion that becomes a bad concrete because it contains slime by simple means In addition, it is possible to form a well-prepared pile head top surface in the pile head steel pipe.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a steel pipe column erection method and a cast-in-place pile head processing method for the same according to the present invention will be described with reference to the drawings.
[0016]
In Fig. 1, in the pre-process of the steel pipe column erection method, it is possible to remove the surplus portion of the cast-in-place pile, which becomes poor concrete because it contains slime, by simple means to form a well-prepared pile head top surface. An example of a pile head processing method for a cast-in-place pile to be able to be performed will be described.
[0017]
This cast-in-place pile head processing method has an upper edge 23 and a lower edge in a pile head steel pipe 1 built to prevent the pile hole H from collapsing in the upper part of the pile hole H having a required diameter and depth. The rim 25 is in sliding contact with the inner peripheral surface of the pile head steel pipe 1 and the barrel walls 22 and 24 are formed in a tapered shape so that the middle has the small-diameter barrel 21, and is substantially horizontal to the position of the small-diameter barrel 21. The pile head removal guide 2 having the expansion crushing agent 6 disposed therein is installed, and concrete is placed in the pile hole H. Then, the expansion crushing agent 6 causes the small diameter body portion 21 of the pile head removal guide 2 to move. The concrete is crushed statically at the position, and the extra pile portion C1 of the cast-in-place pile is removed together with the pile head removal guide 2.
[0018]
Incidentally, in the Kuiana H, it is rarely write built reinforcing bar cage up to a predetermined height position of the pile head steel pipe 1.
[0019]
In this case, the pile head removing guide 2 can be divided into a plurality of parts (in this embodiment, divided into two parts) so as to be easily installed and post-processed in the pile head steel pipe 1. It is desirable that the main body 2A is composed of a half-pipe-shaped body 2A.
In addition, a post-process can be performed still more easily by apply | coating a concrete peeling material to the internal peripheral surface of the guide 2 for pile head removal.
[0020]
The pile head removal guide 2 is installed in the pile head steel pipe 1 so as to be suspended from a fixed angle 3 spanning the upper end of the pile head steel pipe 1 via a suspension bolt 4 for height adjustment. In this state, the camber 2B is driven between the trunk main bodies 2A and 2A so as to be fixed and installed in the pile head steel pipe 1.
[0021]
In this embodiment, the pile head removal guide 2 is formed with the barrel walls 22 and 24 in a tapered shape so that the middle has a small-diameter trunk portion 21, but the pile head removal guide 2 has a lower edge 25. Is in sliding contact with the inner peripheral surface of the pile head steel pipe 1, and the shape thereof is not limited as long as the middle has a small-diameter trunk 21. For example, the upper trunk wall 22 has an intermediate small-diameter trunk 21. It can also be formed in a straight shape so as to have the same diameter.
However, the capacity | capacitance of the surplus part C1 is ensured, without enlarging the dimension of the height direction of the pile head removal guide 2 by forming the upper trunk | drum wall 22 in a taper shape like a present Example. Will be able to.
[0022]
Further, a bracket 26 is projected on the inner peripheral side of the small-diameter body portion 21 of the pile head removal guide 2, and a thin rod-shaped crushing agent fixing tool is formed on the bracket 26 so as to have, for example, a cross beam shape. Attach 5 with a wire.
[0023]
For example, an expansion crushing agent 6 formed in a rod shape is attached to the crushing agent fixture 5 by a wire or the like.
This expansion crushing agent 6 is formed into a rod shape by filling a bag with a drug that expands when it absorbs water. As this drug, calcium alumino-ferrite ((CaO) ₄ .Al ₂ O ₃ · Fe 2 O _3), the free calcium oxide (CaO), the water-swellable agents, such as magnesium oxide (MgO) as the basic component, which was added boric acid salt which acts as a retardant, a mixture Is used.
In this case, the type and amount of the retarder are adjusted so that the expansion crushing agent 6 absorbs and expands in an appropriate time zone after placing the concrete.
The drug listed here is an example, and the present invention is not limited to this. Any substance that has the property of expanding by absorbing water and any substance that has the property of delaying the substance are used. be able to.
[0024]
In addition, after the concrete is placed, before the surplus portion C1 is cured, the surplus portion C1 in the pile head removal guide 2 is hooked on a crane hook or the like via a wire rope and pulled up. Then, the removal anchor 7 formed in a substantially U shape or the like is embedded so that a part of the removal anchor 7 is exposed so that the pile-up portion C1 can be removed together with the pile head removal guide 2.
[0025]
Next, the construction process and operation of this cast-in-place pile head processing method will be described.
[0026]
In the pile head steel pipe 1 built in the pile hole H, the upper end edge 23 and the lower end edge 25 are in sliding contact with the inner peripheral surface of the pile head steel pipe 1, and the body wall 22 so that the middle has the small diameter body part 21. , 24 are formed in a tapered shape, and a pile head removing guide 2 in which the expansion crushing agent 6 is disposed substantially horizontally at the position of the small-diameter trunk portion 21 is installed.
[0027]
This pile head removal guide 2 is installed in the pile head steel pipe 1 so as to be suspended from a fixed angle 3 spanned on the upper end of the pile head steel pipe 1 via a suspension bolt 4 for height adjustment. In this state, the camber 2B is driven between the trunk main bodies 2A and 2A which are divided into two in a vertically split shape, so that they are fixed and installed in the pile head steel pipe 1.
[0028]
In this state, concrete is placed in the pile hole H, and the surplus portion C1 that becomes poor concrete because it contains slime is the trunk wall 22 above the middle-diameter trunk 21 in the middle of the pile head removal guide 2. To be formed inside.
[0029]
And after placing concrete, when predetermined time passes, the expansion crushing agent 6 absorbs and expands at the position of the small diameter trunk portion 21 of the pile head removal guide 2 in which the expansion crushing agent 6 is disposed. The concrete is statically crushed.
[0030]
Thereafter, bisected barrel body 2A in silos shaped pile head removal guide 2, a camber 2B was removed implanted between 2A, the anchor 7 divided to advance embedded in KuiyoSakari portion C1 The pile portion C1 can be removed together with the pile head removing guide 2 by hanging the wire rope and pulling it up to the crane hook or the like.
[0031]
As a result, it is possible to statically remove the surging portion C1 that becomes a poor concrete because it contains slime by simple means, and the crushing of the concrete of the small-diameter trunk 21 of the pile head removal guide 2 Since it is carried out along the expansion crushing agent 6 arranged substantially horizontally at the position, it is possible to form a pile head top surface in the pile head steel pipe 1 and smoothly carry out the subsequent construction process of the steel pipe column. Will be able to do.
[0032]
Next, FIG. 2 shows a steel pipe column for enabling a steel pipe column such as a concrete-filled steel pipe column to be accurately built by simple means on the top of the pile from which the surplus portion of the cast-in-place pile is removed. An example of the erection method will be shown.
[0033]
This steel pipe column erection method is, for example, the center position where the steel pipe column 11 on the pile head top surface T from which the pile-up portion C1 of the cast-in-place pile C is removed by applying the above-mentioned cast-in-place pile head method is applied. The anchor hole H1 is formed in the anchor hole H1 and the anchor 10 provided with the adjustment plate 9 is installed in the anchor hole H1 so that the height can be adjusted. The steel pipe column 11 provided with 13 is suspended from above while adjusting the center position by the anchor 10 and the pile core guiding member 13, and the steel pipe column 11 is placed on the adjustment plate 9 via the end plate 12. Furthermore, the adjuster 8 which adjusts the space | interval between the steel pipe pillar 11 and the pile head steel pipe 1 which were mounted in this way, and adjusts the perpendicularity of the steel pipe pillar 11 is provided in several places of the upper end part of the pile head steel pipe 1 Install in Those were Unishi.
[0034]
In this case, since the anchor hole H1 is for aligning the axial centers of the cast-in-place pile C and the steel pipe column 11, it is usually formed with a diameter of about 20 to 30 mm and a depth of about 300 to 600 mm.
[0035]
The anchor 10 inserted into the anchor drilling hole H1 is fixed vertically using resin mortar or the like so that the upper end of the anchor 10 protrudes from the top face T of the pile usually about 150 to 300 mm. by adjusting the adjustment plate 9 which is disposed adjustably more height screwing the anchor 10, so as to set the height of the upper surface of the adjusting plate 9 to the height position of the lower end of the steel pipe column 11 To do.
The adjustment plate 9 and the anchor 10 are designed to have a strength that allows the steel pipe column 11 to be placed on the adjustment plate 9 via the end plate 12.
[0036]
By the way, the anchor hole H1 is usually formed by a rock drill to which a bid is attached. However, it is difficult to form at a predetermined position because the bid swings due to the unevenness of the pile top surface T and the vibration of the rock drill itself. Met.
In order to cope with this, in the present embodiment, the anchor hole H1 is formed by temporarily installing a center position indicating member 14 that indicates the center position of the pile head top surface T shown in FIG. The anchor 10 is installed by supporting the anchor 10 using the center position indicating member 14.
The center position indicating member 14 includes a main body plate 14a, unevenness adjusting screws 14b disposed at a plurality of positions (four positions in the present embodiment) on the lower surface of the main body plate 14a, and a plurality of positions on the peripheral surface of the main body plate 14a. The adjuster 14c for fixing the main body plate 14a by abutting and supporting the pile head steel pipe 1 disposed in (four places in the present embodiment) and the two-dimensional movement on the main body plate 14a A center position determining slide plate 14d for indicating the center position of the steel pipe column 11 of the pile head top surface T disposed in an adjustable manner, a fixing screw 14e for fixing the center position determining slide plate 14d to the main body plate 14a, The anchor holding metal fitting 14f that supports the anchor 10 when the anchor 10 is installed.
[0037]
And this center position instruction | indication member 14 measures the center position which builds the steel pipe pillar 11 of the pile head top surface T, Then, while adjusting the unevenness adjustment screw 14b so that the main body plate 14a becomes horizontal, it is a fixing adjuster. The main body plate 14a is fixed to the pile head steel pipe 1 through 14c.
Thereafter, the hole formed at the center of the center position determining slide plate 14d is aligned with the center position where the steel pipe column 11 of the pile head top surface T previously measured is built, and the center position determining slide plate 14d is fixed by the fixing screw 14e. It fixes to the main body plate 14a.
And the anchor hole H1 is formed by the rock drill to which the bid was attached, using the hole formed in the center of the center position determination slide plate 14d as a guide.
Thereafter, the anchor hole H1 is filled with a resin mortar or the like used for fixing the anchor 10, and the anchor 10 is maintained vertical until the resin mortar or the like is cured by the center position indicating member 14 via the anchor holding fitting 14f. To support.
And after resin mortar etc. harden | cure, the center position instruction | indication member 14 is removed and installation of the anchor 10 is completed.
[0038]
As a result, the anchor drilling hole H1, which has been difficult to be formed at a predetermined position due to the unevenness of the pile head top surface T and the vibration of the rock drill itself, is accurately determined based on the temporary center position indicating member 14 as a reference. The anchor 10 can be supported and accurately installed while maintaining the verticality until the resin mortar or the like used for fixing the anchor 10 is cured by the center position indicating member 14. .
[0039]
The pile core guiding member 13 disposed at the center position of the lower end via the end plate 12 is provided with an insertion hole for the anchor 10 at the top and is formed to have a substantially conical downward recess, whereby a steel pipe The steel pipe column 11 can be placed on the adjustment plate 9 via the end plate 12 while adjusting the center position of the steel pipe column 11 simply by hanging the column 11 from above.
[0040]
Next, the construction process and operation of the steel pipe column erection method will be described.
[0041]
An anchor 10 provided with an adjustment plate 9 is installed in an anchor hole H1 formed at the center position where the steel pipe column 11 of the pile head top surface T from which the extra portion C1 of the cast-in-place pile C is removed is adjusted. To do.
In this case, by using the center position indicating member 14, the anchor hole H1 can be accurately formed, and the anchor 10 can be accurately installed.
[0042]
Then, the steel pipe column 11 in which the pile core guiding member 13 is disposed at the center position of the lower end via the end plate 12 is suspended from above while adjusting the center position by the anchor 10 and the pile core guiding member 13, and the adjustment plate A steel pipe column 11 is placed on 9 via an end plate 12.
[0043]
Further, the adjuster 8 disposed at a plurality of positions on the upper end of the pile head steel pipe 1 adjusts the interval between the pile head steel pipe 1 and the steel pipe column 11 to adjust the verticality of the steel pipe column 11, and Establish vertically.
[0044]
In this state, concrete is placed between the pile head steel pipe 1 and the steel pipe pillar 11 and, if necessary, in the steel pipe pillar 11, and the cast-in-place pile C and the steel pipe pillar 11 are placed on the pile head steel pipe 1 and the concrete. To integrate.
[0045]
Thereby, the steel pipe column 11 can be built accurately while adjusting the center position, height and verticality of the steel pipe column 11 by simple means, and the accuracy of buildings such as buildings and bridges can be improved. In addition, the construction period can be shortened.
[0046]
As mentioned above, although the construction method of the steel pipe pillar of the present invention and the pile head processing method of the cast-in-place pile for that were explained based on the example, the present invention is not limited to the configuration described in the above example. For example, the configuration described in each embodiment can be appropriately changed in a range that does not depart from the gist of the invention, for example, in combination with another method.
[0047]
【The invention's effect】
According to the steel pipe column erection method of the first invention, an anchor hole is formed at the center position where the steel pipe column on the top surface of the pile from which the extra pile portion of the cast-in-place pile is removed, and the anchor hole is formed in the anchor hole. the height adjustable and arranged adjustment plate anchor installed by screws, an arranged the steel column pile core guide member through the end plate to the center position of the lower end, the center by the anchor and Kuishin guide member While the position is adjusted, the steel pipe column is hung from above and the steel pipe column is placed on the adjustment plate via the end plate. Therefore, it is possible to improve the accuracy of buildings such as buildings and bridges and to shorten the construction period.
[0048]
Then, a center position indicating member that indicates the center position for laying the steel pipe column on the top of the pile from which the extra portion of the cast-in-place pile has been removed is temporarily formed to form an anchor hole, and the anchor is fixed by the center position indicating member. By installing the anchor in support, the center position indicating member temporarily installed the anchor drilling hole, which was difficult to form in place due to the swing of the bid due to the unevenness of the pile head top surface and the vibration of the rock drill itself In addition, the anchor can be accurately installed by supporting the anchor while maintaining the verticality until the resin mortar or the like used for fixing the anchor is cured by the center position indicating member.
[0049]
In addition, by installing adjusters that adjust the distance between the pile head steel pipe and the steel pipe column at multiple locations on the upper end of the pile head steel pipe, the steel pipe pillar that has been built accurately while adjusting the center position and height. The verticality can be easily adjusted.
[0050]
Moreover, according to the pile head processing method of the cast-in-place pile of the second invention, at least the lower end edge is in sliding contact with the inner peripheral surface of the pile head steel pipe in the pile head steel pipe, and a small diameter body portion is provided in the middle. The pile head removal guide with the expansion crushing agent disposed almost horizontally at the position of the small diameter trunk is installed, and after the concrete is placed, the small diameter trunk of the pile head removal guide by the action of the expansion crushing agent. The concrete is crushed statically at the position of the pile, and the extra pile part of the cast-in-place pile is removed together with the guide for removing the pile head. Can be removed statically, and a pile head top surface can be formed in the pile head steel pipe, whereby the concrete placing process of cast-in-place pile and the steel pipe column building process can be performed respectively. The degree of freedom increases, cast in place The like an anchor process of pouring step and the subsequent steel columns of the concrete can be smoothly carried out.
[Brief description of the drawings]
FIG. 1 shows a construction example of a pile head processing method for a cast-in-place pile according to the present invention, in which (A) is a front longitudinal sectional view, and (B) is a sectional view taken along line AA of (A).
FIG. 2 shows a construction example of the steel pipe column erection method of the present invention, (A) is a front longitudinal sectional view, (B) is a sectional view taken along line BB of (A), and (C) is a main part of FIG. It is a front longitudinal cross-sectional view.
FIGS. 3A and 3B show a center position indicating member used in the steel pipe column erection method of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a front longitudinal sectional view.
[Explanation of symbols]
C Cast-in-place pile C1 Overfill 1 Pile head steel pipe 2 Pile head removal guide 2A Trunk body 2B Camber 21 Small diameter barrel 22 Trunk wall 23 Upper edge 24 Trunk wall 25 Lower edge 3 Fixed angle 4 Hanging bolt 5 Crushing agent fixture 6 Expansion crushing agent 7 Removal anchor 8 Adjuster 9 Adjustment plate 10 Anchor 11 Steel pipe column (concrete-filled steel pipe column)
12 End plate 13 Pile core guiding member 14 Center position indicating member

Claims (4)

An anchor hole is formed at the center position where the steel pipe column on the top of the pile from which the extra pile portion of the cast-in-place pile is removed, and an adjustment plate is arranged in the anchor hole so that the height can be adjusted by a screw. The steel pipe column in which the pile core guiding member is disposed at the center position of the lower end via the end plate is suspended from above while adjusting the center position by the anchor and the pile core guiding member, The steel pipe column erection method is characterized in that the steel pipe column is placed through the end plate.   A center position indicating member that indicates the center position of the steel pipe column on the top of the pile from which the extra pile portion of the cast-in-place pile is removed is temporarily installed to form an anchor hole, and the anchor is supported by the center position indicating member. The steel pipe column erection method according to claim 1, wherein an anchor is installed.   2. The verticality of the steel pipe column is adjusted by arranging an adjuster for adjusting the distance between the pile head steel pipe and the steel pipe column at a plurality of positions on the upper end of the pile head steel pipe. Or the steel pipe pillar erection method of 2 description.   In the pile head steel pipe, at least the lower end edge is in sliding contact with the inner peripheral surface of the pile head steel pipe, and has a small-diameter trunk in the middle, and an expansion crushing agent is disposed substantially horizontally at the position of the small-diameter trunk. After installing the pile head removal guide and placing the concrete, the concrete is statically crushed at the position of the small diameter body of the pile head removal guide by the action of the expansion crushing agent, and cast in place with the pile head removal guide. A pile head treatment method for cast-in-place piles, characterized in that the excess pile portion of the piles is removed.

Images