JP2013060756A - Apparatus for measuring inclination of pile material, and method for confirming vertical accuracy of pile material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method that can confirm vertical accuracy of a pile material after installation.SOLUTION: An inclination measuring apparatus A is for confirming vertical accuracy of a pile material B, such as a guide pile, a core material, or a sheet pile, after installation of the pile material B. The apparatus A has a long body 1 that has a linear shape and can be installed in the pile material B, and a level gauge 2 attached to the long body 1. After the long body 1 is attached to the pile material B, the longitudinal direction of the long body 1 is parallel to the longitudinal direction of the pile material B, at least part of the long body 1 is exposed to the ground surface, and the level gauge 2 is positioned at the exposed part.

Description

  The present invention relates to a device for measuring the inclination of an installed pile material and a method for confirming the vertical accuracy of the pile material using the device.

  Pile materials represented by the main pile used in the horizontal pile sheet pile method, the core material or sheet pile used in retaining walls such as SMW walls, intermediate piles (shelf piles) that indicate cutting beams, or support piles for gantry and jetty In general, it is inserted or installed in the ground while checking the vertical accuracy as appropriate.

  If the pile material tilts in the ground, the rear end of the pile material will be greatly displaced in the front-rear direction and the left-right direction of the pile material, and it will be built on the existing structure on the back side of the pile material or on the front side May interfere with the structure of the building, and may adversely affect the construction of adjacent piles and sheet piles.

As a method for confirming the vertical accuracy of the pile material in the middle of installation, various methods are known in addition to the visual inspection by the worker.
For example, as described in Patent Document 1, a pile pipe before placing is fitted with a protective pipe that contains an inclinometer in advance, and the inclination of the inclinometer is measured during placing to check the vertical accuracy. There is a way to do it.

Japanese Patent Laid-Open No. 10-245845

However, the conventional confirmation method described above can cause the following problems.
(1) Once the inclinometer is removed from the pile material and installation work on the next pile material is started, the vertical accuracy of the installed pile material cannot be reconfirmed.
Therefore, when the installed pile material is inclined afterwards by installation work of other pile materials or excavation work of the ground, the post-inclination cannot be detected.
(2) If a device such as an inclinometer is attached to the pile material before installation, the inclinometer may be damaged by an impact during the installation, and sufficient measurement may not be suitable.
(3) Since the work of attaching and detaching the inclinometer is indispensable before and after the pile material is installed, the labor on the process is large.

  That is, this invention makes it one of the objectives to provide the apparatus which can confirm vertical accuracy with respect to the pile material after installation, and its method.

1st invention of this application made in order to solve any one of the said problems is the inclination measuring apparatus for confirming the vertical accuracy of the said pile material after installation of pile materials, such as a parent pile, a core material, and a sheet pile. A long body that has a linear shape and can be installed on the pile material, and a leveler that is attached to the long body, the long body being attached to the pile material, The longitudinal direction of the body is parallel to the longitudinal direction of the pile material, and at least a part of the elongated body is exposed to the ground surface, and the leveling device is located in the exposed portion. An inclination measuring device is provided.
Further, the second invention of the present application is a method for confirming the vertical accuracy of pile materials such as a parent pile, a core material, and a sheet pile, and after the installation of the pile material, the inclination measuring device according to the first invention, Provided with the pile material so that the level is exposed to the ground, and determining the vertical accuracy of the pile material from the measured value of the inclinometer, to provide a method for confirming the vertical accuracy of the pile material Is.

According to the present invention, at least one of the following effects can be obtained.
(1) The vertical accuracy can be confirmed repeatedly even immediately after the pile material is installed or after a new pile material is installed.
(2) Even when the top edge of the pile material is in the ground, it is possible to check the vertical accuracy on the ground.
(3) Easy to attach and detach to the pile material.
(4) When the vertical accuracy of the pile material is poor, it is possible to easily perform the pile driving operation again.

1 is an overall view of an inclination measuring apparatus according to the present invention. The figure which shows the example of attachment of the inclination measuring apparatus of this invention. FIG. 3 is a partially enlarged view of FIG. 2. The figure which shows the other example of attachment of the inclination measuring apparatus of this invention.

  Hereinafter, an example of an inclination measuring apparatus for pile material according to the present invention and an example of a method for using the same will be described with reference to the drawings.

<1> Inclination Measuring Device (1) Overall Configuration FIG. 1 shows an overall view of an inclination measuring device of the present invention.
The inclination measuring apparatus A of the present invention is an apparatus that can be attached to a pile material, and includes at least a long body 1 and a level device 2.
The above pile material is a parent pile used in the horizontal pile sheet pile method, a core material or sheet pile used in a retaining wall such as an SMW wall, an intermediate pile (shelf pile) that indicates a cutting beam, a support pile for a gantry or a pier, etc. Is a representative material.

(2) Long body The long body 1 is a linear longitudinal member, and is a member having a shape like a so-called straight scale.
When the long body 1 is attached to an installed pile material, the long body 1 needs to exhibit such a length that an exposed portion on the ground surface is born.

(3) Level The level 2 is a known device that measures the inclination of the level itself.
The level device 2 is attached in the vicinity of one end of the long body 1 so as to be able to detect the inclination of the long body 1 with respect to the longitudinal direction (axial direction).
The inclination of the level device 1 can be an apparatus that can be measured in various units such as rising [mm / M], angle [°], and gradient [%].

(4) Attachment part In the vicinity of the other end of the long body 1, the attachment part 3 for attaching to a pile material is provided.
In the present invention, the configuration of the attachment portion 3 is not particularly limited, but a configuration that can be easily detached from the pile material is desirable.
In the present embodiment, a magnet is used for the attachment portion 3 so that it can be attached to the pile material with a magnetic force.
Moreover, you may provide the same attaching part 3 between the two points of the longitudinal direction of a long body. In this case, the long body 1 can be more reliably attached to the pile material, and the state in which the longitudinal direction of the pile material and the longitudinal direction of the long body are parallel can be more reliably maintained.

<2> Usage Method of Inclination Measuring Device Next, an example of a method for confirming the vertical accuracy of the pile material will be described with respect to the usage method of the inclination measuring device.
(1) Construction of drilling holes and parent piles Drill the ground and install pile materials at the drilling points. The pile material in this example is H steel B. At this time, the installation proceeds while confirming the vertical accuracy of the H steel B by a known method.

(2) Mounting of measuring device When the installation of the H steel B is completed, the H steel B is completely buried in the ground, or a part of the top end is slightly exposed. In this case, it is virtually impossible for an operator to visually check the vertical accuracy of the H steel B.
Therefore, as shown in FIG. 2, the inclination measuring device A of the present invention is attached to the flange portion B1 of the installed H steel B from the ground surface.
At this time, it is desirable that the leveling device 2 provided in the inclination measuring apparatus A is in a state exposed to the ground surface. This is for the operator to easily confirm the measured value of the level device 2.

(3) Measurement The amount of displacement of the H steel B in the front-rear direction (from the back side to the front side) is measured from the measurement value of the level device 2.
FIG. 3 shows a model diagram for measuring the displacement amount.
When the inclination measuring device A is attached to the flange portion B1 on the front side of the H steel B, the displacement amount is simply expressed by the following equation.
Δk = b−a + c * h
Δk: Entrance / exit amount at the bottom of excavation (displacement) [mm]
b: Horizontal distance from the water thread C to the long body [mm]
a: Horizontal distance from the front side surface of the H steel to the long body [mm]
c: Level measurement value [mm / M]
h: Drilling depth [mm]
* If Δk is “+”, it indicates that there is a bias on the back side,
In the case of “−”, it indicates that the front side is biased.
In addition, since the measurement formula of a displacement amount is suitably changed according to the unit of the measured value of the level device 2, and the attachment location of the inclination measuring apparatus A, it is not limited to the above measurement formula.

(4) Judgment The vertical amount of the pile material depends on whether or not the displacement obtained in this way is within the range of the distance from the pile material (H steel B) to the front side boundary line D and the rear side boundary line E. It can be determined whether or not the accuracy is acceptable.
Since this determination can be performed immediately after the pile material is installed, if the determination result is not preferable, the pile material can be extracted again and re-work can be performed.
After the determination, the inclination measuring device A is removed from the pile material, and the next pile material installation work is started.

(5) Reconfirmation Pile materials are installed in order by repeating the steps (1) to (4) above.
In addition, when the installation of the next pile material is completed, it is preferable to confirm again the vertical accuracy of the existing pile material that has already been installed.
This is because an installed pile material may be displaced in the ground due to a new pile material installation operation.

<3> Other usage method In addition, in the said Example, although the vertical accuracy of the front-back direction of a pile material is confirmed, by changing the attachment location of the inclination measuring apparatus A, the left-right direction ( It is also possible to confirm the vertical accuracy of the pile material installation direction).
As shown in FIG. 4, for example, when the pile material is H steel B, if the inclination measuring device of the present invention is attached to the web portion B2 of H steel, the vertical accuracy in the left and right direction of the pile material is confirmed. Can do.

A Inclination measuring device 1 Long body 2 Level 3 Mounting part B Steel H Water thread D Front side boundary line E Rear side boundary line

Claims (2)

An inclination measuring device for checking the vertical accuracy of the pile material after installation of the pile material,
A long body that exhibits a linear shape and can be installed on the pile material;
A level attached to the elongate body,
The long body, after being attached to the pile material, the longitudinal direction of the long body is parallel to the longitudinal direction of the pile material, and at least a part of the long body is exposed to the ground surface, the exposure The level is located in a part,
Pile material tilt measuring device. A method for checking the vertical accuracy of pile material,
After installation of the pile material, the inclination measuring device according to claim 1 is attached to the pile material so that the leveler is exposed to the ground,
A method for confirming the vertical accuracy of a pile material, wherein the vertical accuracy of the pile material is determined from a measured value of the inclinometer.

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