KR100816044B1 - Structure lifting and supporting method by using a micro pile - Google Patents

Abstract

A method for lifting and supporting a structure by using a micro pile is provided to obtain supporting force regardless of sizes of the sunk structure and the ground and to maintain a lifted state of the structure by rotating a mounting coupler. A through hole is formed in a foundation(110) of a lower surface of a structure(100). A micro pile(200) where a thread is formed on an outer peripheral surface, is constructed on the ground of the structure by passing through the through hole. A hollow cylindrical reaction sleeve(300) inserted by a mounting bar(350) is inserted in the through hole. The reaction sleeve is lifted up with predetermined height to closely contact the mounting bar with the foundation of the structure. A hollow cylindrical mounting coupler(600) is coupled with the micro pile and placed in the reaction sleeve. A reaction supporting body(700) is installed by fixing an upper end of the reaction device at the upper supporting body. A pulling-up unit(800) is installed between the micro pile and the upper supporting body to lift up the structure. The mounting coupler is rotated to maintain the lifted state of the structure.

Description

Structural LIFTING AND SUPPORTING METHOD BY USING A MICRO PILE}

The present invention relates to a structure lifting and supporting method using a micro pile. More specifically, the present invention relates to a structure supporting and pulling method using a micropile which can raise and support a settled structure by installing a reaction force sleeve, a reaction force support, and a pulling means by constructing a micropile on a lower foundation of the structure and using it as a support point. .

In case of reinforcement of the foundation due to settlement of the constructed structure, the method of injecting cement liquid or mortar into the ground has been mainly used.However, this method is difficult to secure construction quality and suppresses further settlement. There was a problem that it is not effective because it is only effective.

In this regard, a structure raising method (Patent Registration No. 10-0621669) using an indenter capable of raising a sinking structure more efficiently has been recently developed.

It is possible to press-fit the pile when the field work condition is very bad or when the basic construction using the equipment is difficult, but it can restore the function of the structure by reinforcing and raising the foundation for the structure that is built on the soft ground and caused the sedimentation. The pile press construction method and basic reinforcement method that can raise and handle only the minimum necessary parts without completely dismantling or dismantling the structure requiring repair or reinforcement.

That is, as shown in FIGS. 1A and 1B, in order to first install the reaction force support 20, the reaction force hole 12 is drilled in the bottom plate, which is the base 11 of the structure, and then the reinforcement or Penetrating the lower end of the reaction force tool 21, such as steel rod, and fixed to the bottom of the structure bottom plate, the upper support member 22 in the form of a circular plate is installed on the upper side of the reaction force tool 21, artificially supporting the reaction force support (20; 21, 22) on the structure,

In the lower part of the upper support 22, a press-fit body 30, such as a steel pipe, is set in the press-in hole 13 drilled to a predetermined depth, such as the reaction force hole 12, and the press-fit member 30 and the upper support body ( 22) by actuating the press-fit means 40 including the hydraulic cylinder in between, press-fit the press body 30 to the lower part of the structure, and then, the pressing means 50 including the hydraulic cylinder is installed on the press-fit press body 30 As a result, it is possible to raise the structure settled by the pulling means (50).

In addition, as shown in FIG. 1C, the press-fit body 30 pressed into the bottom of the raised structure is integrated with the structure and the finished reaction force 21 to serve as a foundation pile for supporting the structure.

However, the structure impression method using the press-fitting body has a problem that the installation and fixing of the reaction force is not easy because the reaction force is installed separately, the press-fitting of the press-in body eventually uses the size of the structure, that is, the weight as the reaction force If the size of the small or the gravel is mixed in the ground, the indentation may not be completely indented, the residual settlement could be a problem.

In addition, there is a problem that the structure can be settled again in the process of finishing the press-fit indentation body integrated with the structure and the reaction sphere.

The present invention is to solve the above problems,

SUMMARY OF THE INVENTION An object of the present invention is to provide a reaction force supporting structure which can be easily settled in a drilling hole of a foundation of a structure while being able to install a pile to a predetermined depth regardless of the size or ground of the structure to be settled, and finishing the raised structure. In the process of the structure can maintain the temporary lifting state of the structure to provide a structure lifting and supporting method that can easily complete the structure lifting work.

The present invention to achieve the above technical problem,

First, after forming the perforation hole on the base of the bottom of the structure, the micro pile formed in the outer circumferential surface of the thread is constructed in the lower ground of the structure through the perforation hole, the thread is formed on the inner peripheral surface of the middle portion, the longitudinal direction on the lower outer peripheral surface A plurality of insertion grooves are formed side by side, and a hollow cylindrical reaction force sleeve into which the fixing bar connected to the hinge is inserted into the insertion groove is inserted into the drilling hole so that the fixing bar is in close contact with the lower part of the structure foundation.

A hollow cylindrical fixing coupler having a thread formed on an inner circumferential surface and an outer circumferential surface thereof is fastened to the micro pile so as to be positioned inside the reaction sleeve, and a lower end of the reaction force is connected to an upper end of the reaction force sleeve, and an upper end of the reaction force is connected to an upper support. Install a reaction force support by fixing it, and install and operate the impression stage between the top of the micro pile and the top support to raise the structure,

The fixing coupler is rotated to be fastened to the thread formed on the inner circumferential surface of the reaction force sleeve to maintain the pulling state of the structure, and the micro pile, the fixing coupler and the reaction force sleeve are integrated to finish the structure lifting work and support the structure. It was made.

According to the present invention, the pile can be installed to a predetermined depth regardless of the size or the ground of the structure to be settled, so that not only a more reliable support force can be obtained, but also there is no fear of remaining settlement, and the drilling holes of the structure base can be more easily installed. By providing a reaction force supporting structure that can be settled, the work of lifting the structure is easy and quick.

In addition, it is possible to maintain the pulling state of the structure even during the finishing process after the structure is raised, thereby increasing the efficiency of the structure lifting work and to support the structure stably.

BRIEF DESCRIPTION OF DRAWINGS To describe the present invention more clearly and easily, the following describes the best embodiments of the present invention in detail with reference to the accompanying drawings, and embodiments according to the present invention may be modified in various other forms, and thus the scope of the present invention. Is not limited to the embodiments described below.

2a to 2i are shown in the order of the structure lifting and support method using a micropile according to the present invention.

First, the present invention is to form a punching hole 120 for setting the reaction force sleeve to be described later on the base 110 of the bottom of the structure, as shown in Figure 2a, to form a punching hole 120 using a conventional drilling equipment And, considering the size of the structure and the degree of settlement will be able to form a plurality dogs as needed.

Next, as shown in Figure 2b through the drilling hole 120 is to construct a micro pile (Micro Pile, 200) in the lower ground structure 100.

Micro pile method is one of the methods to secure the bearing capacity of the pile by inserting the pile (Pile) into the ground, briefly described as follows.

The micro pile method was developed and constructed in Italy in the 1950s as a foundation reinforcement for buildings, and the terms are mixed with Mini Pile, Micro Pile, Root Pile, Needle Pile, and Gewi Pile depending on the purpose and scope of application. It is true.

In general, the micro pile method comprises drilling a ground using bits having various diameters to form a drilling hole, and when the drilling is completed, installing a micro pile in a drilling hole formed in the ground and a drilling hole in which the micro pile is installed. The grouting process consists of the steps of grouting and drilling with a small diameter, so the equipment is small and can be constructed with little noise and vibration.In general, it is impossible to input large equipment such as residential areas and narrow places in the city center. It is used for work in difficult confined spaces or restricted areas.

In this case, the micro pile is mainly used with a threaded rod on the outer circumferential surface to improve adhesion to cement grout, and can be cut or connected according to the length of use from the upper fixing end to the tip, or can be connected using a coupler. It becomes possible.

Therefore, in the present invention, the thread is formed on the outer circumferential surface as a micro pile 200 to be constructed to a predetermined depth on the lower ground of the structure, the upper end to be exposed to the upper structure foundation 110.

Next, as shown in FIG. 2C, a cylindrical reaction force sleeve 300 having a hollow portion larger than the diameter of the micro pile 200 is inserted into the drilling hole 120, and the micro pile 200 is in the drilling hole 120. In the reaction force is disposed to penetrate the hollow portion of the sleeve 300.

3A and 3B show a detailed view of the reaction force sleeve 300, the following description of the features of the reaction force sleeve 300 will be described with reference to these drawings.

The reaction force sleeve 300 is formed to be longer than the thickness of the base 110 of the structure using a steel pipe 310, the same pitch as the thread formed on the outer peripheral surface of the micro pile 200 on the inner peripheral surface of the middle portion of the reaction force sleeve 300 A thread 330 having a pitch is formed.

In addition, the lower outer peripheral surface of the reaction force sleeve 300 is formed with a plurality of insertion grooves 340 side by side in the longitudinal direction, the fixing grooves 350 are inserted into the insertion groove 340, respectively,

The fixing bar 350 is for fixing the reaction force sleeve 300 to the structure base 110, and has a bar shape made of steel, and a hinge key protruding from the lower portion of the fixing bar 350. 351 is formed and a hinge groove 341 is formed on the lower side of the insertion groove 340 to be hinged to each other.

As a result, the fixing bar 350 rotates while the upper end of the fixing bar 350 is separated from the insertion groove 340 around the hinge connection portion, so that the fixing bar 350 is rotated to extend in a direction perpendicular to the longitudinal direction of the reaction force 300.

Accordingly, the lower end of the fixing bar 350 is rounded to facilitate rotation, and the upper end of the fixing bar 350 is rounded or inclined toward the insertion groove 340 to facilitate separation from the insertion groove 340. Is formed.

The insertion groove 340 and the fixing bar 350 may be formed in any number according to the size of the reaction force sleeve (300).

In addition, the reaction force plate 300 is formed on the upper end of the reaction plate 320 is made of a circular plate of the donut-shaped with a through-hole formed in the center, the reaction plate 320 is the same diameter as the upper hollow portion of the reaction force sleeve 300 It has a through hole and expands the upper end of the reaction force sleeve 300, thereby facilitating the connection of the reaction force support to be described later.

The reaction force sleeve 300 is inserted such that the lower portion of the reaction force sleeve 300 in which the insertion groove 340 and the fixing bar 350 are formed passes completely through the structure base 110.

After the reaction force sleeve 300 is fully inserted, the fixing bar 350 should be unfolded for fixing as shown in FIG. 2D, but the fixing bar 350 may naturally unfold to some extent, depending on the ground 100. In some cases, 350 may be forced to be unfolded, and a spring (not shown) is installed between the insertion groove 340 and the fixing bar 350 to prepare for this case. To some extent.

That is, while the reaction force sleeve 300 is inserted into the drilling hole 120 formed in the structure foundation 110, the fixing bar 350 is completely inserted into the insertion groove 340, but the reaction force sleeve 300 is completely inserted. After insertion, the fixing bar 350 is in contact with the ground 100, so that it can be unfolded to some extent.

In addition, instead of installing the spring as shown in detail in Figures 3a and 3b to form a through-hole 370 communicating from the insertion groove 340 into the reaction sleeve 300, the middle portion in the through-hole 370 By installing the hinge-shaped clasp 360 connected to the hinge, one end of the clasp 360 protrudes into the reaction force sleeve 300, and the other end is in contact with the fixing bar 350.

After the reaction force sleeve 300 is completely inserted therein, as shown in FIG. 4, the hollow pipe 400 is inserted between the reaction force sleeve 300 and the micro pile 200 to protrude into the reaction force sleeve 300. By pushing one end of the 360 into the through hole 370, the other end of the clasp 360 protrudes the upper portion of the fixing bar 350 to the outside of the insertion groove 340, as a kind of seesaw, so that the fixing bar 350 is To some extent.

As such, when the fixing bar 350 is stretched to some extent and the reaction force sleeve 300 is raised to a predetermined height as shown in FIG. 2E, the upper end of the fixing bar 350 slides in contact with the bottom of the structure foundation 110, and the fixing bar slides. 350 is fully extended to be in close contact with the bottom of the structure foundation 110.

In this case, in order to raise the reaction force sleeve 300, a first lifting means 500 including a hydraulic cylinder is installed between the reaction force plate 320 formed at the upper end of the structure base 110 and the reaction force sleeve 300, thereby providing a first impression. By operating the pulling means 500 it is possible to raise the reaction force sleeve (300).

Next, as illustrated in FIG. 2F, the cylindrical fixing coupler 600 having the hollow portion is fastened to the micro pile 200 so as to be positioned inside the reaction force sleeve 300.

The fixing coupler 600 is usually manufactured in a cylindrical shape with threads formed on the inner circumferential surface and the outer circumferential surface by using steel, and the thread formed on the inner circumferential surface of the fixing coupler 600 corresponds to the thread formed on the outer circumferential surface of the micro pile 200. The thread formed on the outer circumferential surface of the fixing coupler 600 is formed to correspond to the thread formed on the inner circumferential surface of the reaction force sleeve 300.

Therefore, the threads formed on the inner circumferential surface and the outer circumferential surface of the fixing coupler 600 have the same pitch.

In this case, the fixing nut 610 may be further installed on the fixing coupler 600 without being tightened, and the fixing nut 610 may also be fastened to the micro pile 200.

Next, as shown in FIG. 2G, the lower end of the reaction force tool 710 is connected to the reaction force plate 320 formed at the upper end of the reaction force sleeve 300, and the upper end of the reaction force tool 710 is fixed to the upper supporter 720. The support 700 will be installed.

The reaction mechanism 710 is usually made of reinforcing bars or steel bars, the through-hole 321 is formed in the reaction plate 320 formed on the upper end of the reaction force sleeve 300 corresponding to the number of installation of the reaction force 710 , The lower end of the reaction force 710 is fastened and fixed by a fastener 711 such as a fastening nut,

The upper support 720 made of a circular plate is fastened and fixed to the upper end of the reaction force 710, the through hole 721 is also formed in the upper support 720 to correspond to the number of installation of the reaction force 710 The upper end of the reaction force 710 is fastened and fastened by a fastener 711 such as a fastening nut.

After the reaction force support 700 is installed as described above, the settled structure is raised by using the micro pile 200 as a supporting point.

That is, a second lifting means 800 including a hydraulic cylinder is installed between the upper end of the micro pile 200 and the upper support 720, and the second lifting means 800 uses the first lifting means 500. Although it may be used as it is, it will be desirable to be configured separately from the hydraulic cylinder having a larger capacity because the difference of the object to be pulled is large.

It is possible to raise the structure to the state before settlement by using the second lifting means 800, the micro pile 200 to support the operation of the hydraulic cylinder, the reaction force of the reaction force support 700 and the reaction force sleeve ( It is delivered to the foundation 110 of the structure by 300, so that the structure is raised as a result.

At this time, by attaching a conventional strain gage to the structure it can be confirmed in real time that the structure is raised and restored to the state before settlement.

After confirming that the raised structure is restored to the state before settlement, the fixing coupler 600 is rotated and moved downward as shown in FIG. 2H to be fastened to the thread formed on the inner circumferential surface of the reaction force sleeve 300.

That is, the inner circumferential surface of the fixing coupler 600 is engaged with the micro pile 200, and the outer circumferential surface of the fixing coupler 600 is fastened with the reaction force sleeve 300, which is formed on the inner circumferential surface and the outer circumferential surface of the fixing coupler 600. This is possible because it has the same pitch.

At this time, the fixing nut 610 is also rotated to move downward to be firmly tightened with the fixing coupler 600.

The fixing coupler 600 maintains the pulling state of the structure to support the structure. Then, the second lifting means 800 and the reaction force support 700 are dismantled in order, and the micro pile as shown in FIG. 2I. Finish 200 and the reaction force sleeve (300).

First, the reaction force sleeve 300 is cut so as not to protrude above the structure foundation 110, and the micro pile 200 is also cut so as not to protrude above the structure foundation 110.

The cut reaction force sleeve 300 is filled with a filling material 910 including concrete so that the micro pile 200, the fixing coupler 600, and the reaction force sleeve 300 are integrated, and finally, the micro pile 200 is It can function as a foundation pile to support the raised and restored structure.

The cut reaction force sleeve 300 may be further installed and welded to the head finish plate 920 in the form of a circular plate to be integrated with the reaction force sleeve 300 to make the finishing process more robust.

In addition, by placing a finishing concrete (not shown) on the upper surface of the reaction force sleeve 300, the cut upper end of the reaction force sleeve 300 and the head finish plate 920 is not exposed to the outside to prevent corrosion and aesthetics It can be promoted.

1A to 1C illustrate a structure lifting and foundation reinforcement method using a conventional indenter.

2a to 2i sequentially show the construction order of the structure lifting and support method using a micropile according to the present invention.

3A and 3B show detailed perspective views of the reaction force sleeve of the present invention.

Figure 4 shows a detailed cross-sectional view of the reaction force sleeve of the present invention.

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

100: Ground 110: Foundation

120: drilling hole 200: micro file

300: reaction sleeve 320: reaction plate

340: Insertion groove 350: Fixing bar

400: hollow pipe 500: first raising means

600: fixing coupler 700: reaction support

710: reaction hole 720: upper support

800: second impression means 910: filler

920: tofu deadline

Claims (8)

Forming a hole in the base of the structure; Constructing a micro pile formed on an outer circumferential surface of the thread through the drilling hole in the lower ground of the structure; A thread is formed on the inner peripheral surface of the middle portion, and a plurality of insertion grooves are formed side by side on the lower outer peripheral surface, and a hollow cylindrical reaction force sleeve into which the fixing bar connected to the hinge is inserted into the insertion groove is inserted into the drilling hole. Doing; Raising the reaction force sleeve to a predetermined height such that the fixing bar is extended to be in close contact with a lower portion of the structure base; Fastening a hollow cylindrical fixing coupler having threads formed on an inner circumferential surface and an outer circumferential surface thereof to the micro pile so as to be positioned inside the reaction force sleeve; Connecting a lower end of the reaction force to the upper end of the reaction force sleeve, and fixing the upper end of the reaction force to the upper support to install the reaction support; Raising the structure by installing and operating the lifting means between the top of the micro pile and the upper support; Maintaining the pulling state of the structure by rotating the fixing coupler to be coupled to a screw thread formed on an inner circumferential surface of the reaction force sleeve; And Structural lifting and supporting method using a micro pile, characterized in that the finishing process by integrally finishing the micro pile, the fixing coupler and the reaction force sleeve. The method of claim 1, wherein the thread formed on the inner peripheral surface of the middle portion of the reaction force sleeve is formed to have the same pitch as the thread formed on the outer peripheral surface of the micro pile. According to claim 2, wherein the unfolding of the fixing bar is After the reaction force sleeve is inserted into the drilling hole, the structure bar lifting and supporting method using a micro pile, characterized in that the fixing bar is unfolded by the elasticity of the spring installed between the insertion groove and the fixing bar of the reaction force sleeve. According to claim 2, wherein the unfolding of the fixing bar is An intermediate part is hinged to a through hole communicated from the insertion groove of the reaction force sleeve to the reaction force sleeve, one end of which protrudes into the reaction force sleeve, and one end of the U-shaped latch is installed so that the other end contacts the fixing bar. A reaction structure lifting and supporting method using a micro pile, characterized in that the fixing bar is unfolded by being pushed into the through hole by the hollow pipe sandwiched between the reaction force sleeve and the micro pile after the reaction sleeve is inserted into the drilling hole. The impression force according to any one of claims 1 to 4, wherein the impression force sleeve is Structural lifting and supporting method using a micro pile, characterized in that by the operation of the first lifting means including a hydraulic cylinder installed between the top of the structure base and the reaction plate made of a circular plate of the donut-shaped formed on the upper end of the reaction sleeve. The method of claim 5, After the fastening coupler is fastened to the micro pile, the fastening nut is further tightened, the fastening coupler is fastened to the reaction force sleeve, and the fixing nut is tightened with the fixing coupler. Method. The method of claim 6, The finishing treatment step is to cut the reaction force sleeve and the micro pile so as not to protrude to the upper portion of the structure base, and filling the filler including the concrete inside the cut reaction force sleeve to integrate the micro pile, fixing coupler and reaction force sleeve Structure raising and supporting method using micro pile. The method of claim 7, wherein After filling the filler inside the cut reaction sleeve, the step of installing and welding the head finishing plate in the form of a circular plate on the cut reaction sleeve is further added structure and lifting method using a micro pile.

Images