KR101562957B1 - Method for Pushing Pipes into Ground - Google Patents

Method for Pushing Pipes into Ground Download PDF

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Publication number
KR101562957B1
KR101562957B1 KR1020150080356A KR20150080356A KR101562957B1 KR 101562957 B1 KR101562957 B1 KR 101562957B1 KR 1020150080356 A KR1020150080356 A KR 1020150080356A KR 20150080356 A KR20150080356 A KR 20150080356A KR 101562957 B1 KR101562957 B1 KR 101562957B1
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KR
South Korea
Prior art keywords
steel pipe
deformation
press
deformation rate
strain
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KR1020150080356A
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Korean (ko)
Inventor
이호현
Original Assignee
주식회사 산강이엔씨
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Priority to KR1020150080356A priority Critical patent/KR101562957B1/en
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Publication of KR101562957B1 publication Critical patent/KR101562957B1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid

Abstract

The present invention relates to a steel pipe press-fitting method to detect a deformation of a steel pipe through calculation by deformation rate calculation sensors, and more specifically, relates to a steel pipe press-fitting method to detect a deformation of a steel pipe through calculation by deformation rate calculation sensors, wherein a deformation rate of the steel pipe is measured with the deformation rate calculation sensors installed on an interior of the steel pipe pressed and fitted to a ground, a deformation of the steel pipe is detected based on a measured deformation rate, and a linearity of the steep pipe is improved by correcting the deformation of the steep pipe by heating the steel pipe. The steel pipe press-fitting method to detect a deformation of a steel pipe through calculation by deformation rate calculation sensors comprises: a deformation rate calculation sensor installation step of installing a plurality of deformation rate calculation sensors on a position of an inner circumferential surface of the steel pipe pressed and fitted to the ground in a circumferential direction, the position being away from a front end part of the steel pipe at a predetermined distance; a heating means installation step of installing a plurality of heating means on a position of the inner circumferential surface of the steel pipe in the circumferential direction to apply heat to the steel pipe, the position being away from the deformation rate calculation sensors at a predetermined distance; a press-fitting step of pressing and fitting the steel pipe where the deformation rate calculation sensors and the heating means are installed to the ground; a calculation step of calculating a deformation rate of the steel pipe with the deformation rate calculation sensors measured in the press-fitting step; and a deformation estimation step of estimating whether the steel pipe is deformed based on the deformation rate measured in the calculation step.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of pressing a steel pipe to detect deformation of a steel pipe by measurement using a strain measuring sensor,

The present invention relates to a steel pipe indentation method for detecting deformation of a steel pipe by measurement using a strain measuring sensor, and more particularly, to a strain measuring device for measuring strain of a steel pipe by using a strain measuring sensor installed inside a steel pipe press- A steel pipe indentation method that detects the deformation of a steel pipe by measuring a strain measurement sensor that improves the straightness of the steel pipe by correcting the deformation of the steel pipe by sensing the deformation of the steel pipe based on the deformation of the steel pipe and applying heat to the steel pipe .

There is a method of constructing a structure by opening or closing the structure by constructing the structure in the ground.

If it is necessary to install underground roads, tunnel structures, etc. by crossing existing roads and railways, it is not possible to transfer the obstacles due to construction, In order to construct the construction method by non-installation, forward bases and reaching bases of the work center concept are essential for both sides of the road or obstacle crossing. Typical non-installation ground structure construction methods include the armor pulling method and the steel pipe loop method .

The armor pulling method is a method in which a steel pipe for supporting the armature supporting about 600 mm in advance is horizontally pushed in the direction of the reaching base from the forward base and then traversed through the ground from the reaching base of the opposite side of the body to be towed It is a method to attach the PC steel wire to the field-made enclosure, to pull the inside of the enclosure to remove the internal soil, and to repeat the traction and excavation work to install the structure in the ground. In this method, there is a risk of sinking in roads or obstacles on the upper part of the enclosure due to the gap between the propulsion load of the enclosure or the propulsion enclosure and the hypothetical steel pipe already installed in the ground. Also, since the enclosure is pre- It is difficult to work in a deep underground space because the work area is large.

If the connection between the enclosures is insufficiently treated, leakage may occur. Due to the disadvantages of such a jacking method, steel pipe indenting method is widely applied to the construction method of non-detachable underground structure.

First, a conventional steel pipe indenting method will be described with reference to Figs. 1 to 6. Fig. In the conventional steel pipe indenting method, the steel pipe 1 is press-fitted in advance into the ground where the structure is to be formed in advance to form a steel pipe loop, and all the internal gravel inside the steel pipe loop is completely removed to construct the structure.

In order to construct the underground structure by the steel pipe loop method, first, as shown in FIG. 1, considering the size of the sphere to be formed at the forward base, the steel pipe 1 having a length of 600-800 mm is horizontally press- And a steel pipe loop is formed.

When a steel pipe is press-fitted and a loop made of a steel pipe is constructed, the inside of the loop to be constructed is excavated. Excavation is carried out step by step downward from the loop steel pipe portion of the upper layer in consideration of safety against upper load and side pressure.

As shown in FIG. 2, excavation is performed while installing the temporary columns 2 at regular intervals along the direction of excavating the upper surface of the steel pipe with the H-shaped steel material in the direction perpendicular to the steel pipe 1. The work proceeds on both sides as shown in Fig.

When the excavation progresses to some extent in the state shown in FIG. 2, the excavation is performed while installing the additional pillar 2 as shown in FIG.

When excavation proceeds in the state shown in FIG. 3, the excavation proceeds while extending the hypothetical column 2 installed at the beginning, while the transverse support 3 is installed as shown in FIG. do.

When the excavation progresses to the state shown in FIG. 4 to some extent, the excavation operation is performed in the state shown in FIG.

When the drilling operation is completed, the foundation 4 and the underground structure 5 are constructed as shown in FIG. The underground structure 5 shown in FIG. 6 is a reinforced concrete structure, and the underground structures in FIGS. 1 to 5 are indicated by dotted lines.

The direction in which the steel pipe is inserted is very important in the construction of an underground structure by the above-mentioned steel pipe loop method. This is because the direction in which the underground structure is constructed is determined by the direction in which the steel pipe is inserted.

However, in the past, research on the method of determining whether the steel pipe is inserted in the first direction or correcting it if not inserted in the second direction seems to be insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the background art, and it is an object of the present invention to provide a strain gauge sensor for monitoring whether or not a steel pipe inserted into a ground is inserted in a desired direction, And to provide a steel pipe indenting method for detecting a deformation of a steel pipe by a measurement using a strain measuring sensor capable of correcting it.

As a means for solving the above-mentioned problems,

A strain measuring sensor installation step in which a plurality of strain measuring sensors are installed along the circumferential direction of the inner circumferential surface of the steel pipe at a position spaced from the distal end of the inner circumferential surface of the steel pipe pressurized to the inside of the ground;

Installing a plurality of heating means installed along a circumferential direction of the inner circumferential surface of the steel pipe at a predetermined distance from the strain measuring sensor to apply heat to the steel pipe;

A press-fitting step of pressing a steel pipe provided with the strain measuring sensor and the heating means into a ground;

Measuring a strain of the steel pipe by the strain measuring sensor in a process of press-fitting the steel pipe in the press-fitting step; And

A deformation estimating step of estimating deformation of the steel pipe based on the strain of the steel pipe measured at the measuring step; The present invention provides a steel pipe indenting method for detecting a deformation of a steel pipe by a measurement using a strain measuring sensor.

In this case, it is preferable to further include a correction step of temporarily stopping the press-fitting when the deformation of the steel pipe is detected in the deformation estimating step, and correcting deformation occurring in the steel pipe by heating the steel pipe with the heating means.

According to the present invention, it is possible to monitor the deformation of a steel pipe by measuring a strain measuring sensor that monitors whether a steel pipe inserted into a ground is inserted in a desired direction by using a strain measuring sensor, A steel pipe indentation method can be provided.

Figs. 1 to 6 are diagrams for explaining a conventional non-installation type excavation method. Fig.
7 is a view for explaining a steel pipe used in a steel pipe press-fitting method according to one embodiment of the present invention.
8 is a view for explaining an installation method of the strain measuring sensor shown in Fig.
9 and 10 are views for explaining correction steps of a steel pipe indenting method according to one embodiment of the present invention.
11 is a flowchart of a steel pipe indenting method according to one embodiment of the present invention.

Hereinafter, a steel pipe indenting method for detecting a deformation of a steel pipe using the strain measuring sensor according to a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 7 is a view for explaining a steel pipe used in the steel pipe press-fitting method according to one embodiment of the present invention, FIG. 8 is a view for explaining a method of installing the strain measuring sensor shown in FIG. 7, Is a view for explaining the correction step of the steel pipe indenting method according to one embodiment of the present invention.

In the present invention, the strain measurement of a steel pipe used in a steel pipe indenting method is measured using a strain gauge sensor, and the measured result is analyzed to estimate a press-in direction of the steel pipe. This is a method of indenting a steel pipe. Hereinafter, one embodiment of the present invention will be described.

The steel pipe press-fitting method for detecting the deformation of the steel pipe by the measurement using the strain measuring sensor according to the present embodiment includes a strain measuring sensor mounting step, a heating means mounting step, an indenting step, a measuring step, a deformation estimating step, and a correcting step.

The strain measuring sensor mounting step is a step of installing a plurality of strain measuring sensors 10 along the circumferential direction of the inner circumferential surface of the steel pipe at a position spaced from the distal end of the inner circumferential surface of the steel pipe 100 to be press-

The front end portion of the steel pipe 100 refers to the leftmost portion of the steel pipe 100 in FIG. 7 as a portion contacting the ground first when the steel pipe is press-fitted.

Fig. 7 shows a steel pipe provided with a strain measuring sensor 10. Fig. In this embodiment, when the top end of the steel pipe is viewed, the uppermost one is indicated at 12 o'clock, and the lowermost one is indicated at 6 o'clock. Four strain measurement sensors (one at each of 12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock) 10 are installed. The strain measuring sensor 10 can measure more sensitively as the number of the strain measuring sensors 10 increases. However, since the work is troublesome for a large number of strain measuring sensors 10, the number of strain measuring sensors installed in accordance with the situation of the site can be determined.

The strain measuring sensor 10 is installed at a position spaced a certain distance from the distal end of the steel pipe 100. The strain measuring sensor 10 may be damaged when the strain measuring sensor 10 is installed at the distal end thereof, It is easier to estimate the deformation of the steel pipe from the strain measurement results of the steel pipe.

8, the steel plate 30 is welded to the steel pipe 100 by covering the thin steel plate 30 as shown in FIG. 8, and the strain measuring sensor 10 is placed in contact with the ground (friction) Thereby preventing damage. The structure denoted by reference numeral 11 in FIG. 8 is a lead wire electrically connected to the strain measuring sensor 10, and the steel plate 30 is configured to cover the lead wire 11 as shown in FIG.

The heating means is installed along the circumferential direction of the inner circumferential surface of the steel pipe at a position spaced from the strain measuring sensor 10 by a plurality of heating means 20 for applying heat to the steel pipe.

In the present embodiment, four heating means 20 are provided as shown in FIG. 7, and the positions of the heating means 20 are set at 12 o'clock, 3 o'clock when looking at the front end of the steel pipe 100, 6, and 9 o'clock, respectively.

The press-fitting step is a step of pressing the steel pipe 100 provided with the strain measuring sensor 10 and the heating means 20 into the ground. Since the press-fitting of the steel pipe 100 is the same as that performed in the general steel pipe loop method, the detailed description thereof will be omitted.

The measuring step may include a step of measuring the strain of the steel pipe by the strain measuring sensor 10 in the process of press-fitting the steel pipe 100 at the press-fitting step, and the strain occurring in the steel pipe 100 at a predetermined time interval or continuously .

The deformation estimating step estimates the deformation of the steel pipe based on the strain of the steel pipe 100 measured at the measuring step.

When the pressurization of the steel pipe 100 is started, a compressive stress is applied to the steel pipe 100 as a whole, so that the strain is generated.

9, when the steel pipe 100 is bent in the (-) x direction with respect to the xz plane (if it is bent at 6 o'clock direction), tensile stress is applied to the upper side of the center line cL of the steel pipe And the compressive stress acts on the lower part. Therefore, it is estimated that the strain measuring sensor 10a installed at 12 o'clock position has relatively little compression deformation or tensile deformation, and that the strain measuring sensor 10b installed at 6 o'clock position has a relatively large compression deformation. In this case, it means that a relatively small compressive strain or large compressive strain is measured. It means that when the steel pipe is press-fitted, compressive deformation occurs as a whole in the steel pipe, which means that relatively large deformation or small deformation is measured to be.

It can be assumed that the steel pipe 100 is bent at 9 o'clock when it is determined that relatively small compression deformation or tensile deformation has occurred in the strain measuring sensor installed at 3 o'clock.

Of course, since the ground has very heterogeneous properties, the compressive stress acting on the steel pipe 100 at every moment during the press-fitting process may be changed. Therefore, rather than estimating the deformation of the steel pipe based on the instantaneous change in the compressive stress value, It is preferable to presume that the deformation of the steel pipe occurs when there is a difference in the value of the relative compressive stress. If necessary, the deformation is estimated to be a value obtained by measuring the strain when the indentation is stopped and the compressive stress generated by the indentation is removed You may.

Therefore, if the strain measured by the strain measuring sensor 10 is different, it can be assumed that deformation has occurred in the steel pipe.

The correction step suspends the press-fitting when the deformation of the steel pipe 100 is detected in the deformation estimating step, and corrects the deformation occurring in the steel pipe by heating the steel pipe 100 by the heating means 20. [

As shown in FIG. 9, when the steel pipe 100 is bent at 6 o'clock, a relatively large compressive stress acts at 6 o'clock. Since the steel pipe 100 is made of a steel material and the steel material tends to stretch when it is heated, when the steel pipe is heated by the heating means 20b installed at 6 o'clock, tensile deformation due to heat occurs at 6 o'clock. It is possible to expect the effect that the deformation of the entire steel pipe 100 is corrected by the tensile deformation.

Fig. 10 shows a state in which the deformation of the steel pipe 100 is corrected by heating a part of the steel pipe 100 by heating means to induce tensile deformation.

The degree of heating by the heating means 20 is determined in consideration of the deformation estimated at the deformation estimation step, the temperature in the ground, the thickness of the steel pipe, the outer diameter of the steel pipe, and so on. It is necessary to determine the index for the heating time.

When the correction step is completed, the steel pipe is pressed into the ground again, and the strain of the steel pipe is continuously measured during the indenting process, and the deformation of the steel pipe is estimated using the measured result. If it is deemed that deformation has occurred in the steel pipe, The steel pipe is pressed in again while repeating the calibration step again.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments, A steel pipe indentation method that detects deformation of a steel pipe by measuring various types of strain measurement sensors in the steel pipe.

10: strain measuring sensor 20: heating means
100: steel pipe 30: steel plate

Claims (2)

A strain measuring sensor installation step in which a plurality of strain measuring sensors are installed along the circumferential direction of the inner circumferential surface of the steel pipe at a position spaced from the distal end of the inner circumferential surface of the steel pipe pressurized to the inside of the ground;
Installing a plurality of heating means installed along a circumferential direction of the inner circumferential surface of the steel pipe at a predetermined distance from the strain measuring sensor to apply heat to the steel pipe;
A press-fitting step of pressing a steel pipe provided with the strain measuring sensor and the heating means into a ground;
Measuring a strain of the steel pipe by the strain measuring sensor in a process of press-fitting the steel pipe in the press-fitting step; And
A deformation estimating step of estimating deformation of the steel pipe based on the strain of the steel pipe measured at the measuring step; Wherein the deformation of the steel pipe is detected by a measurement using a strain measuring sensor.
The method according to claim 1,
A correcting step of temporarily suspending the pressurization when the deformation of the steel pipe is detected in the deformation estimating step and correcting deformation occurring in the steel pipe by heating the steel pipe with the heating means; Wherein the deformation of the steel pipe is detected by the measurement using the strain measuring sensor.
KR1020150080356A 2015-06-08 2015-06-08 Method for Pushing Pipes into Ground KR101562957B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102059036B1 (en) 2018-09-12 2019-12-24 김덕현 Warp correction methods and warp correction device for steel material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003148677A (en) 2001-11-07 2003-05-21 Sekisui Chem Co Ltd Synthetic resin pipe fitting and angle adjusting method for the same
KR100891960B1 (en) 2008-08-06 2009-04-10 석정건설(주) A method of construction where the propulsion course amendment of the pipe is possible
JP5071786B2 (en) 2007-07-24 2012-11-14 財団法人ヒューマンサイエンス振興財団 Penetration pipe strain gauge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003148677A (en) 2001-11-07 2003-05-21 Sekisui Chem Co Ltd Synthetic resin pipe fitting and angle adjusting method for the same
JP5071786B2 (en) 2007-07-24 2012-11-14 財団法人ヒューマンサイエンス振興財団 Penetration pipe strain gauge
KR100891960B1 (en) 2008-08-06 2009-04-10 석정건설(주) A method of construction where the propulsion course amendment of the pipe is possible

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102059036B1 (en) 2018-09-12 2019-12-24 김덕현 Warp correction methods and warp correction device for steel material

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