KR20030024109A - A method of measurement pile drive - Google Patents

Abstract

PURPOSE: Provided is a method for easily and accurately determining amount of final input when striking a pile on ground and/or on the sea, and for confirming safety of workers and efficient striking work. CONSTITUTION: The method comprises preparing an observation paper(200) by drawing lines at constant interval; attaching the observation paper on surface of a pile(100) reached a rock floor(600) by hammering(400) the pile when determining input amount of the pile to be remarkably reduced; mounting a device(300) to determine the amount at a position spaced from the pile; and reading numerical values displayed on the observation paper to determine the final input amount of the pile.

Description

Final penetration measurement method during pile driving {A METHOD OF MEASUREMENT PILE DRIVE}

The present invention relates to a pile driving method, and more particularly, to a method capable of easily and accurately measuring the final penetration amount in not only land driving construction but also marine driving construction.

In general, when constructing a structure at a construction site, the foundation work, that is, the driving work, is completely carried out to completely pile the pile to the underground rock layer for solid support of the structure. The measurement of whether the file is inserted to the rock layer during the driving operation is determined by the operator as the measurement of the penetration amount of the file inserted at every stroke in the file side.

In other words, during the driving process, the file is easily inserted at the beginning and then inserted more than a predetermined depth to reach the rock layer. At this time, the operator installs the base around the pile, attaches the recording paper to the pile surface, grabs the pencil with his hand, and measures the penetration and repulsion amount, preferably by measuring the depth to be inserted at every stroke. Will be judged.

However, the above-described penetration measurement method requires the operator to observe from the side of the pile during the driving operation, so that oil is scattered during the driving or the head concrete of the pile is broken, so that the fragments splash to the worker and pose a risk of a safety accident. There is a problem that requires.

In particular, the above measurement method can be applied to land navigation work, but the navigation work carried out at sea receives weather conditions such as blue, tidal current, and stormy weather. That's why it's virtually lacking in reality.

Accordingly, an object of the present invention for solving the above problems is to provide a method capable of easily and accurately measuring the final penetration amount at the time of land navigation construction as well as marine navigation construction.

Another object of the present invention is to provide a method for measuring the final penetration amount during pile file driving which can be applied to the sea pile file driving to ensure efficient air management and economical efficiency.

Still another object of the present invention is to provide a final penetration measurement method capable of securing the safety of the measurer and efficient pile driving.

Still another object of the present invention is to provide a method for accurately measuring the final penetration amount even when the rock layer is a matter during pile driving.

The present invention according to the first aspect for achieving the above object is a process of creating a sheet of observation by drawing a line at a predetermined interval, and the pile tip reaches the rock layer during the rudder operation, the penetration of the pile is significantly reduced If it is determined that the observation paper is attached to the surface of the pile, a transit or theodolite is installed at a certain distance from the pile, and then read the number indicated on the observation sheet using the crosshairs of the transit to the final tube Implement the final intrusion measurement method for pile driving, which consists of the measurement of the quantity of particles.

1 is a view showing a method for measuring the final penetration amount during pile driving at sea according to a first embodiment of the present invention.

FIG. 2 is a view showing a change amount of a marking state and a penetration amount of an observation sheet shown in FIG. 1; FIG.

3 is a view showing a method for measuring the final penetration amount when the place for pile driving according to the second embodiment of the present invention matters.

4 is a view showing the position of the file and the measuring device shown in FIG.

FIG. 5 is a view showing a change amount of a marking state and a penetration amount of an observation sheet shown in FIG. 4; FIG.

<Description of the symbols for the main parts of the drawings>

100: file 200, 200a: observation sheet

300: measuring device 400: hammer

600: rock bed 600a: inclined rock bed

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

On the other hand, the final penetration measurement method for pile driving in accordance with an embodiment of the present invention to be described later, the foundation work for driving the pile up to the rock bed basement for solid support when installing the structure (bridge, building, etc.) in the sea, preferably sea Although it will be described only as a method of measuring the final intrusion amount during construction, it is obvious that the measuring method described in the present invention can be equally applied to all fields for carrying out pile driving.

1 to 2 are views illustrating a method of measuring the final penetration amount during pile driving according to an embodiment of the present invention.

Referring to FIG. 1, the present invention is a method for measuring the final penetration during the construction of firmly driving the pile (100) to the rock bed layer 600 of the sea above the barge 500, in detail, conventional It is a method of observing the final penetration amount by using the cross-section of the transit or theodolite, which is one of the measuring device 300 by creating the final penetration amount observation paper 200 using the grid.

That is, as shown in FIG. 2, a thick line is drawn and displayed on the scale of the paper in 1 cm units to prepare the final penetration amount observation paper 200, and then the observation paper 200 is attached to the surface of the pile 100. In this case, the file 100 may be displayed in consideration of the inclination angle of the matter on the observation sheet 200a as shown in FIG. 5.

Then, after measuring the final penetration amount using the measuring device 300 as shown in FIG. 2, the bearing capacity is calculated to compare and examine the allowable bearing capacity in the specification or design. On the other hand, the bearing capacity review method can be used to examine the final penetration measurement obtained by the method of the present invention using the Hailey formula, Jan bu formula or ENR (Enmeering News Record) formula to review the allowable bearing capacity Since the method of examining the bearing capacity using these formulas is well known in the art, a detailed description thereof will be omitted and will be briefly described below.

1) Hailey formula

here,

Ru: dynamic ultimate bearing capacity of the pile (ton)

Wr: weight of hammer (ton)

Wp: Weight of pile and pile head attachment (ton)

Eh: Blowing edge (ton ?? cm) = W _r H

e _h : hammer efficiency

S: Elastic settlement of pile (cm)

c _p : Elastic settlement of pile (cm)

c _c : Elastic deformation of pile head attachment (cm)

c _q : Elastic deformation of the ground ?? (cm)

n: repulsion coefficient of hammer and pile

If you simply write

here,

c = (c _p + c _c + c _q )

In the Hailey formula, the safety factor is used.

In the transplant, e _h , c _p , c _c , c _q , eta are referred to those presented in the British Steel Piling Company pocketbook.

2) Official ENR. Engmeering News Record

Drop hammer (ton)

Single Acting Sting Hammer (ton)

Double Acting Sting Hammer (ton)

here,

Wr: Hammer Weight (ton)

H: Hammer drop (cm)

P: Vapor pressure in the hammer cylinder (t / cm ² )

a: cross section of cylinder (cm ² )

S: final penetration (cm)

Use the formula to find the safety factor of 6 for the allowable bearing capacity.

3) Jan bu formula

here,

Ru: the ultimate bearing capacity of the pile (ton)

L: Pile Length (cm)

A: Pile length cross-sectional area (cm ² )

E: modulus of elasticity of pile material (ton / cm ² )

Wr: weight of hammer (ton)

Wp: Fall of pile (cm)

H: Hammer drop (cm)

S: final penetration (cm)

e _h : hammer efficiency

0.70 (when piles penetrate easily)

0.55 (when pile is penetrated normally)

0.40 (when pile penetration is difficult)

The safety factor of the Yanbu formula is 4 to 6.

Hereinafter, the present invention will be described in detail based on the preferred embodiment of the present invention, but the present invention is not limited to the embodiment.

{Example 1}

As shown in Figure 1, using a grid paper to draw a thick line in 1cm increments on the scale of the paper to create the observation sheet 200, then the observation sheet 200 is coated and can be used repeatedly and water It can be used even if touched, and it is not deformed.

Subsequently, when the driving operation of the file 100 is performed and the tip of the file 100 reaches the rock layer 600 and it is determined that the penetration amount of the file 100 is significantly reduced, the file 100 is used by using a tape or a band. On the surface of the observation paper 200 was attached.

Next, as shown in FIG. 2, the measurement paper 200 attached to the surface of the pile 100 was measured using the crosshair 300a of the transit 300 to measure the penetration amount per 10 strikes. Subsequently, this final penetration amount was substituted into the above-described formula, preferably Hailey's formula, to examine the bearing capacity.

{Example 2}

As shown in FIG. 3, when the pile 100 is inserted into the inclined rock layer 600a, that is, when the pile 100 is a matter, the thick line is inclined in a scale of 1 cm in consideration of the inclination of the matter. The observation sheet 200 was created by marking. That is, as shown in FIG. 5, lines were drawn at regular intervals while maintaining the same angle as the inclination of the inclined rock layer 600a, and then marked with "1 cm, 2 cm, 3 cm ...." next to them.

Next, the above-described observation paper 200 is coated so that repeated use is possible and can be used even in contact with water and is not deformed.

Subsequently, the driving operation of the pile 100 is performed, and when the tip of the pile 100 reaches the inclined rock layer 600a and it is determined that the penetration amount of the pile 100 is significantly reduced, the pile 100 is used by using a tape or a band. The observation sheet 200a was attached to the surface of the sheet).

Next, as shown in FIG. 2, after measuring the observation paper 200a attached to the surface of the pile 100 using the crosshairs 300a of the transit 300, the percussion penetration amount was measured ten times. This capacity was then substituted into the above formula, preferably Hailey's formula, to examine the bearing capacity.

As described above, the final penetration measurement method for pile driving according to the embodiment of the present invention achieves many effects as follows.

First, the present invention observes the final penetration amount by using a transit to ensure the safety of the observer, and also has the advantage that can be observed from a long distance by displaying the scale of the grid as a thick line.

Secondly, the present invention does not need to install a separate provisional facility for measuring the penetration amount, there is an advantage that can be used even in the case of matters by using the observation site considering the inclination in the paper.

Third, the present invention can be used repeatedly by coating the observation paper, it is possible to use even in contact with water, and can prevent the deformation of the paper.

Fourth, the present invention is easy to apply the implementation method can be efficient construction management, in particular, there is a synergistic effect that can easily measure the final intrusion during the land pile driving as well as sea pile driving.

Claims (5)

In the method of measuring the final penetration amount during pile driving, Drawing observation sheets by drawing lines at predetermined intervals; Attaching the observation paper to the surface of the pile when the tip of the pile reaches the rock layer and judges that the penetration of the pile is significantly reduced during the driving operation; And installing a measuring device at a predetermined distance from the file, and measuring a final penetration amount by reading a number written on the observation sheet using the measurement device. The method of claim 1, wherein the observation sheet is drawn by inclining a predetermined angle in consideration of the inclination of the matter when the pile is a matter. The method of claim 1 or 2, wherein the measuring device is a transit or theodolite. The method according to claim 1 or 2, wherein when the observation sheet is attached to the surface of the pile, the position of the pile is checked through the observation sheet using the measuring apparatus, and then the measuring apparatus is removed after hitting the pile several times. Using the observation paper again to determine the location of the file by using the final penetration measurement method characterized in that the process consisting of measuring the final penetration amount. The method of claim 4, wherein the measuring device is a transit or theodolite.