JP2019131990A - Permanent sub-structural column erection method and permanent sub-structural column erection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing a true-structured pillar, which enables a true-structured pillar to be built in a cast-in-place pile with high accuracy in a short time when building a building by a reverse driving method. A method of constructing a true pillar is to install a rotary excavator 30 on a ground surface 2, rotate a casing 31 by the rotary excavator 30 to excavate a pile hole 3, and concrete in the pile hole 3. Step S1 of forming the cast-in-place pile 20 and mounting the built-in pedestal 50 on the rotary excavator 30 so that the built-in pedestal 50 can support the inside of the casing 31 of the rotary excavator 30. Steps S2 and S3 in which the guide tube 60 is installed and the horizontal position and vertical accuracy of the guide tube 60 are adjusted, and the false column 10 is suspended along the inside of the guide tube 60 and inserted into the cast-in-place pile 20. Step S4 of performing, and the step S5 of removing the guide pipe 60 and the built-in pedestal 50, and then backfilling the earth and sand 4 in the pile hole 3 are provided. [Selection diagram] Fig. 7

Description

  TECHNICAL FIELD The present invention relates to a construction column construction method and a construction column construction device for constructing a construction column into a cast-in-place pile.

Conventionally, as a method of constructing a building having an underground frame, a reverse driving method is sometimes used instead of the forward driving method for the purpose of shortening the construction period and ensuring the safety of the retaining structure.
In the reverse driving method, first, a retaining wall is constructed along the outer periphery of excavation. Next, cast-in-place piles, which are permanent piles, are laid, and at this time, a structural pillar is built in the cast-in-place piles. Next, for example, a floor and a beam on the first floor are constructed as a preceding floor, and the preceding floor is supported by a timber pillar. Next, while excavating the lower side of the preceding floor, the underground frame is constructed from the upper floor to the lower floor, and the upper frame of the preceding floor is constructed from the lower floor to the upper floor. In the construction of the underground structure, the work of excavating the basement and constructing the floor and beams for each underground floor is repeated.
Here, when building a structural pillar on a cast-in-place pile, a frame is installed on the pile hole, and the structural column is supported by this frame to adjust the position and installation of the structural column (patent References 1-3).

By the way, there is an existing concrete structure or a lot of rocks in the ground for constructing underground structures and piles. In this case, a rotary excavator that drives the ground while rotating the cylindrical casing is used. Specifically, a pile hole is formed by driving a casing while destroying existing structures and rocks in the ground with a rotary excavator and removing the earth and sand inside the casing.
When forming a pile hole with this rotary excavator, remove the rotary excavator after forming the pile hole, and then install the above frame around this pile hole to build a structural pillar. Will be included. Therefore, there is a problem that it takes time to build the construction pillar.

Japanese Patent Laid-Open No. 7-3825 Japanese Patent Laid-Open No. 10-299019 Japanese Patent No. 6067171

  In the present invention, when building a building by the reverse driving method, even if there is an existing structure in the ground or a large amount of rock is included, the built-up column can be built in the cast-in-place pile with high accuracy in a short time. It is an object of the present invention to provide a built-in column construction method and a built-in column installation device.

The inventors of the present invention, as a method of erection of a structural pillar that embeds and integrates a structural pillar in a cast-in-place pile, excavates a pile hole with a rotary excavator and places concrete in the pile hole. After the cast-in-place pile has been formed, the column construction device (including the mounting frame) with a guide pipe is installed on the rotary excavator without moving the rotary excavator, and the guide Focusing on the fact that it is possible to build a structural pillar with a column core position and vertical accuracy secured in a cast-in-place pile in a short time by suspending the structural pillar in the pile hole using the pipe as a guide pipe. The present invention has been achieved.
According to the first aspect of the present invention, a built-in column construction method is to build a steel column into a cast-in-place pile (for example, a cast-in-place pile 20 described later) as a built-up column (for example, a built-up column 10 described later). A rotary excavator (for example, a rotary excavator 30 described later) is installed on a ground surface (for example, a ground surface 2 described later), and a casing (for example, a later described) is installed by the rotary excavator. A step of rotating the casing 31) to excavate a pile hole (for example, a pile hole 3 to be described later), placing concrete in the pile hole, and forming a cast-in-place pile (for example, step S1 to be described later); A mounting base (for example, a mounting base 50 described later) is attached on the rotary excavator, and a guide pipe (for example, a guide described later) is supported inside the casing of the rotary excavator by being supported by the mounting base. Tube 60) is installed, and the horizontal direction of the guide tube A step of adjusting the placement and vertical accuracy (for example, steps S2 and S3 to be described later), and a step of suspending the stem column along the inside of the guide tube and inserting it into the cast-in-place pile (for example, to be described later) Step S4), and removing the guide pipe and the mounting frame, and then filling back the pile hole with earth and sand (for example, earth and sand 4 to be described later) (for example, step S5 to be described later) and Features.

According to the present invention, a built-in frame is mounted on a rotary excavator, and a guide pipe is installed inside the casing of the rotary excavator by being supported by the built-in rack, and along the inside of the guide pipe The shin column was suspended and inserted into a cast-in-place pile. Thereby, after placing the concrete of the cast-in-place pile, the construction pillar can be built in the cast-in-place pile without removing the rotary excavator from the pile hole. Therefore, when a building is constructed by the reverse driving method, even if there are existing structures in the ground or a lot of rocks are included, the built-up pillar can be accurately built in the cast-in-place pile in a short time.
In addition, when the structural pillar is suspended from the pile hole, the structural pillar can be quickly built into the cast-in-place pile by guiding it to the guide pipe, and the horizontal direction of the guide pipe By adjusting the position and vertical accuracy (erection), it is possible to easily adjust the horizontal position and vertical accuracy (erection) of the construction pillar in the guide tube.

  According to a second aspect of the present invention, there is provided a positioning device (e.g., a later-described positioning device) capable of adjusting a height position at an upper end portion of the casing when the mounting frame is attached to the casing of the rotary excavator. A positioning device 40) is attached, and the upper end of the positioning device is fitted to the lower surface of the erected gantry to attach the erected gantry to the casing of the rotary excavator.

  According to the present invention, when the mounting frame is attached on the casing via the positioning device, the casing pipe is inclined with respect to the horizontal plane by appropriately adjusting the height position of the positioning device. In addition, it is possible to ensure the level of the built-in frame. In addition, the verticality of the guide column supported by the erection frame can be secured, and then the perpendicularity of the construction column can be secured by suspending the construction column inside the guide tube. In addition, the height position of the positioning device here is the height position of the upper end surface of the positioning device.

  A construction pillar erection device according to a third aspect of the present invention is a construction pillar erection device (e.g., a erection pillar erection device 1 described later) for constructing a construction pillar as a steel column in a cast-in-place pile. A positioning device attached to the upper end of the casing that protects the pile hole of the cast-in-place pile, a built-up frame on which the positioning device fits on the lower surface, and supported by the built-in frame and provided inside the casing A guide pipe, and the positioning device is capable of adjusting a height position of the positioning device, and the mounting frame is a frame-shaped mounting frame main body (for example, a mounting frame main body 51 described later). And a fitting part (for example, a fitting part 52 described later) provided on the lower surface of the erection base body and fitted with the positioning device, and a well girder surrounding the guide tube on the erection base body Main girder combined in a shape (eg Digit 53) and Fukuketa (e.g., characterized in that it comprises a and a secondary girder 54) below.

  According to the present invention, the casing is inclined with respect to the horizontal plane by installing the guide pipe and the erection frame for supporting the guide pipe through the positioning device capable of adjusting the height at the upper end portion of the casing. Even if it is the case, it is possible to easily correct the erection platform horizontally, and it is possible to secure the column core position and vertical accuracy of the built-up column embedded in the cast-in-place pile.

  According to the present invention, when a building is constructed by the reverse casting method, even if there is an existing structure in the ground or a large amount of rock is included, the built-up column is accurately built in the cast-in-place pile in a short time. be able to.

It is a sectional view of a cast-in-place pile in which a built-up pillar is built by a built-up pillar building method according to an embodiment of the present invention. It is a side view of a construction pillar installation device used for a construction pillar construction method of the present invention. FIG. 3 is a cross-sectional view taken along the line AA of the structural pillar erection device of FIG. 2. FIG. 3 is a cross-sectional view taken along line B-B of the structural pillar erection device of FIG. 2. FIG. 5 is a cross-sectional view taken along the line C-C of the true pillar erection device of FIGS. 3 and 4. FIG. 3 is a front view, a longitudinal sectional view, and a look-up view of a positioning device that constitutes the true pillar building device of FIG. 2. It is a construction flowchart of a construction pillar construction method. It is procedure explanatory drawing 1 (installation state of a mounting stand) of the construction method of a construction pillar. It is procedure explanatory drawing 2 (installation condition of a guide pipe | tube) of the construction method of a construction pillar. It is procedure explanatory drawing 3 (construction situation of a construction pillar) of the construction pillar construction method.

The present invention is a built-up column building device for building a built-up column in a cast-in-place pile with high accuracy in a short time, and a method for building a built-up column using the built-up column building device. The present invention relates to a casing of a rotary excavator without excavating a pile hole with a rotary excavator and placing concrete into the pile hole to form a cast-in-place pile, and then moving the rotary excavator. On top of this, install a construction column centering device (including a built-in mount) equipped with a guide tube, and build the construction column on the cast-in-place pile in a short time and along the guide tube. Features.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a cast-in-place pile 20 in which a built-up column 10 is built by a built-up column building method according to an embodiment of the present invention.
A pile hole 3 is formed on the ground surface 2, and concrete is cast into the pile hole 3 to form a cast-in-place pile 20. In the cast-in-place pile 20, a built-up column 10 which is a steel column made of cross H-section steel is built. Specifically, the lower end side of the structural pillar 10 is embedded in the concrete of the cast-in-place pile 20. In addition, the space above the cast-in-place pile 20, that is, the space around the structural pillar 10 in the pile hole 3 is backfilled with earth and sand 4.
Here, when the built-up column 10 is built in the cast-in-place pile 20, the built-up column 10 is built using the built-up column building device 1 shown in FIGS. Adjust the position and verticality.

FIG. 2 is a side view of the true pillar erection device 1. FIG. 3 is a cross-sectional view taken along the line AA of the true pillar erection device 1 of FIG. FIG. 4 is a cross-sectional view taken along the line BB of the true pillar erection device 1 of FIG. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 3 and FIG.
As an initial state, the casing 31 is rotated by the rotary excavator 30 to excavate the pile hole 3 in the ground surface 2, and the cast-in-place pile 20 concrete is placed in the pile hole 3.
The structural pillar erection device 1 includes a positioning device 40 attached to an upper end portion of a casing 31 that protects the pile hole 3 of the cast-in-place pile 20, a erection frame 50 in which the positioning device 40 is fitted to the lower surface, And a guide tube 60 provided inside the casing 31 so as to be supported by the embedded platform 50. The guide column 60 is inserted with the true pillar 10 to which the hanging jig 11 is attached.

FIG. 6A is a front view of the positioning device 40. FIG. 6B is a longitudinal sectional view of the positioning device 40. FIG. 6B is a top view of the positioning device 40.
The positioning device 40 is screwed into the device main body 41, a pair of plate-like holding portions 42A and 42B provided in the device main body 41 and substantially parallel to each other, and screwed into the holding portions 42A and 42B so as to face each other. The sandwiching bolts 43A and 43B that are disposed and the support bolt 44 that is screwed into the apparatus main body 41 and extends upward are provided.
When fixing the positioning device 40 to the casing 31, the positioning device 40 is arranged so that the upper end edge of the casing 31 is sandwiched between the pair of sandwiching portions 42 </ b> A and 42 </ b> B. In this state, the upper end edge of the casing 31 is clamped by the clamping bolts 43A and 43B by appropriately rotating the clamping bolts 43A and 43B.
In the positioning device 40, the height position h of the upper end surface of the support bolt 44 can be adjusted by appropriately rotating the support bolt 44.

2 to 4, the erection gantry 50 includes a frame-like erection gantry body 51 and a fitting portion that is provided on the lower surface of the erection gantry body 51 and into which the support bolts 44 of the positioning device 40 are fitted. 52, and a pair of main girders 53 and a pair of sub girders 54 which are combined in a cross-girder shape surrounding the guide tube 60 on the built-in gantry body 51.
The fitting portion 52 is configured by a pair of cylindrical guide members 55 that are disposed substantially in parallel with a predetermined distance d (see FIG. 6A). The predetermined distance d is slightly larger than the outer diameter of the neck portion of the support bolt 44.

  The pair of main girders 53 are a pair of elongated members that are installed on the erected gantry body 51 with the guide tube 60 interposed therebetween, and are fixed to the erected gantry body 51 with clamping clamps (not shown). . Further, the pair of sub-girder 54 is a pair of long members that are installed with the guide tube 60 sandwiched between the main girders 53 and extend substantially orthogonal to the main girder 53. It is fixed with a clamp.

  The guide tube 60 is a rectangular tube-shaped member extending in the vertical direction. On the upper end side of the guide tube 60, a pair of locking portions 61 that are locked to the upper surfaces of the pair of sub beams 54 are provided. An inclinometer 62 for measuring the vertical degree is attached to the upper end side of the guide tube 60. Further, underwater jacks 63 are attached to the four side surfaces on the lower end side of the guide tube 60 so as to be extendable in the lateral direction.

As shown in FIG. 2, the hanging jig 11 is attached to the upper end portion of the construction pillar 10. On the side surface of the hanging jig 11, a locking portion 12 is provided so as to protrude.
A pair of support members 13 are bridged over the opening at the upper end of the guide tube 60, and a height adjusting jack 14 is interposed between the support member 13 and the locking portion 12 of the hanging jig 11. Has been.

  Hereinafter, the procedure for building the structural pillar 10 in the cast-in-place pile 20 will be described with reference to the flowchart of FIG.

  In step S1, as shown in FIG. 8, a rotary excavator 30 for rotating a cylindrical casing 31 is installed on the ground surface 2, and the casing 31 is rotated by the rotary excavator 30 to form the ground surface 2. The pile hole 3 is excavated and concrete is placed in the pile hole 3 to form the cast-in-place pile 20. At this time, the height position of the upper end surface of the placed concrete is confirmed, and the casing 31 is pulled up so that the height position of the lower end of the casing 31 is higher than the height position of the upper end surface of the placed concrete. .

In step S <b> 2, as shown in FIG. 8, the erection platform 50 is attached on the rotary excavator 30.
Specifically, as shown in FIGS. 5 and 6, the positioning device 40 is attached to the upper end edge of the casing 31, the support bolt 44 of the positioning device 40 is rotated, and the height position of the upper end surface of the support bolt 44 is adjusted. adjust. Next, as shown by the white arrow in FIG. 8, the built-in mount 50 is lifted by a lifting machine, and the support bolt 44 is fitted into the fitting portion 52 of the built-in mount 50, thereby It is attached to the casing 31 of the rotary excavator 30.
Specifically, as shown by the hollow arrows in FIGS. 5 and 6, when the erection base 50 is suspended, the upper end side of the support bolt 44 is inserted between the pair of guide members 55, and then The upper end surface of the support bolt 44 comes into contact with the lower surface 51 </ b> A of the erection base body 51. In this way, the support bolt 44 is fitted into the fitting portion 52 of the erection platform 50.

In step S3, as shown in FIG. 9, the guide pipe 60 is installed inside the casing 31 of the rotary excavator 30 by being supported by the erection platform 50, and the horizontal position and erection of the guide pipe 60 ( Adjust the vertical accuracy.
Specifically, the horizontal positions of the main girder 53 and the sub girder 54 surrounding the guide pipe 60 are determined based on the horizontal mounting position of the guide pipe 60.
Next, an inclinometer 62 and an underwater jack 63 are attached to the guide pipe 60 in advance, and the guide pipe 60 is lifted by a hoist as shown by the white arrow in FIG. 31 is arranged inside.
Next, by placing the main beam 53 and the sub beam 54 at predetermined positions, the guide tube 60 is sandwiched between the main beam 53 and the sub beam 54, and the horizontal position of the guide tube 60 is positioned. The main girder 53 and the sub girder 54 are fixed to the erected gantry main body 51 of the erected gantry 50 with metal fittings.
Next, while measuring the verticality of the guide tube 60 with the inclinometer 62, the underwater jack 63 is driven to adjust the installation of the guide tube 60.

In step S <b> 4, as shown in FIG. 10, the structural pillar 10 is suspended along the inside of the guide tube 60 and inserted into the cast-in-place pile 20.
Specifically, the hanging jig 11 and the spacer 15 are attached to the construction pillar 10 in advance.
First, as shown by an outline arrow in FIG. 10, the frame pillar 10 is lifted by a lifting machine through the lifting jig 11 and is suspended inside the guide tube 60. At this time, the spacer 15 ensures the distance between the side surface of the true pillar 10 and the inner wall surface of the guide tube 60.
Next, as shown in FIG. 2, the support member 13 is bridged over the opening at the upper end of the guide tube 60, and the height adjusting jack 14 is installed between the support member 13 and the locking portion 12 of the hanging jig 11. Then, the height adjusting jack 14 is driven to adjust the height of the structural pillar 10. In addition, the inclinometer 62 is checked, and if the readjustment of the guide pipe 60 is necessary, the underwater jack 63 is driven to readjust the guide pipe 60.

  In step S <b> 5, after the concrete of the cast-in-place pile 20 is hardened, the guide pipe 60 and the built-in mount 50 are removed, and then the earth and sand 4 is backfilled in the pile hole 3.

According to this embodiment, there are the following effects.
(1) A built-in mount 50 is mounted on the rotary excavator 30, and the guide pipe 60 is installed inside the casing 31 of the rotary excavator 30 by being supported by the built-in mount 50. The structural pillar 10 was suspended along the inside of the pile and inserted into the cast-in-place pile 20. Thereby, after placing the concrete of the cast-in-place pile 20, the built-up pillar 10 can be built in the cast-in-place pile 20 without removing the rotary excavator 30 from the pile hole 3. Therefore, when building a building by the reverse driving method, even if there is an existing structure in the ground or a large amount of rock is included, it is possible to build the frame pillar 10 in the cast-in-place pile 20 with high accuracy in a short time. it can.
In addition, when the structural pillar 10 is suspended in the pile hole 3, the structural pillar 10 can be quickly built into the cast-in-place pile 20 by guiding the structural pillar 10 to the guide pipe 60. By adjusting the horizontal position and vertical accuracy (erection) of the guide tube 60, the horizontal position and vertical accuracy (erection) of the structural pillar 10 in the guide tube 60 can be easily adjusted.

  (2) When mounting the mounting platform 50 on the casing 31 via the positioning device 40, the casing 31 is inclined with respect to the horizontal plane by appropriately adjusting the height position of the upper end surface of the support bolt 44 of the positioning device 40. Even in this case, it is possible to ensure the level of the erection frame 50 and to ensure the vertical accuracy of the guide tube 60 supported by the erection frame 50. Moreover, the height adjustment jack 14 is installed in the upper end side of the built-in mount 50, and the height adjustment jack 14 can be expanded and contracted, whereby the height and erection of the structural pillar 10 can be adjusted.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the positioning device 40 of the present embodiment, the height h of the upper end surface of the support bolt 44 can be adjusted by screwing the support bolt 44 into the device main body 41 and rotating the support bolt 44 appropriately. However, it is not limited to this. For example, the support pin may be fixed to the apparatus main body 41 by welding, and the height position h of the upper end surface of the support pin may be constant.

DESCRIPTION OF SYMBOLS 1 ... Construction pillar installation apparatus 2 ... Ground surface 3 ... Pile hole 4 ... Earth and sand 10 ... Construction pillar 11 ... Hanging jig 12 ... Locking part 13 ... Supporting member 14 ... Height adjustment jack 15 ... Spacer 20 ... Location Pile 30 ... Rotary excavator 31 ... Casing 40 ... Positioning device 41 ... Device main body 42A, 42B ... Clamping part 43A, 43B ... Clamping bolt 44 ... Support bolt 50 ... Construction platform 51 ... Construction platform body 52 ... Fitting 53: Main girder 54 ... Sub girder 55 ... Guide member 60 ... Guide tube 61 ... Locking part 62 ... Inclinometer 63 ... Underwater jack

Claims (3)

It is a construction method for building a steel pillar in a cast-in-place pile.
Installing a rotary excavator on the ground surface, rotating the casing by the rotary excavator to excavate a pile hole, placing concrete in the pile hole, and forming a cast-in-place pile;
A mounting base is mounted on the rotary excavator, and a guide pipe is installed inside the casing of the rotary excavator by supporting the mounting base, and the horizontal position and vertical accuracy of the guide pipe are adjusted. Adjusting, and
Suspending the structural pillar along the inside of the guide tube and inserting it into the cast-in-place pile;
Removing the guide pipe and the erection frame, and then filling the pile hole with earth and sand.   When attaching the erection platform to the casing of the rotary excavator, a positioning device capable of adjusting the height position is attached to the upper end of the casing, and the upper end of the positioning device is fitted to the lower surface of the erection platform. The construction pillar construction method according to claim 1, wherein the construction frame is attached to a casing of the rotary excavator. It is a construction pillar erection device that constructs a construction pillar as a steel pillar in a cast-in-place pile,
A positioning device attached to the upper end portion of the casing for protecting the pile hole of the cast-in-place pile, a built-up frame on which the positioning device fits on the lower surface, and supported by the built-in frame and provided inside the casing A guide tube,
The positioning device is capable of adjusting the height position of the positioning device,
The erection platform includes a frame-shaped erection frame main body, a fitting portion provided on a lower surface of the erection frame main body to which the positioning device is fitted, and the guide tube on the erection frame main body. A main pillar erection device comprising: a main girder and a sub girder which are combined in a cross girder shape.

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