WO2007136152A1

WO2007136152A1 - Structure lifting and foundation reinforcing method using steel pipe

Info

Publication number: WO2007136152A1
Application number: PCT/KR2006/004627
Authority: WO
Inventors: Hang Yong Byun; Sun Young Kim
Original assignee: Korea Engineering & Consultant Co., Ltd
Priority date: 2006-05-23
Filing date: 2006-11-07
Publication date: 2007-11-29
Also published as: KR100621669B1

Abstract

Provided is a structure lifting and foundation reinforcing method using a press-in member, capable of arbitrarily constructing a reaction force supporting member, a press-in member, a press-in means inside a structure having a closed and limited space under the ground such as a drainage culvert disposed at a bank, and lifting a structure that subsides. Accordingly, the reaction force supporting member is constructed at a lower plate of the structure, the press-in member is pressed in a lower portion of the structure by using the reaction force supporting member, a lifting means is provided to an upper portion of the press-in member to lift the final structure, and the pressed press-in member is integrated with a fixed reaction force bar and the structure so as to function as a foundation pile of the lifted structure.

Description

[DESCRIPTION]

[Invention Title]

STRUCTURE LIFTING AND FOUNDATION REINFORCING METHOD USING STEEL PIPE

[Technical Field]

The present invention relates to a structure lifting and foundation reinforcing method using a press-in member, and more particularly, to a structure lifting and foundation reinforcing method using a press-in member capable of lifting a structure which subsides by arbitrarily constructing a reaction force supporting member, a lifting means, a press-in means, and a press-in member inside the structure having a closed and limited space under the ground such as a drainage culvert or a drainage structure constructed in a bank, and reinforcing the foundation thereof.

[Background Art]

When a constructed structure subsides or foundation reinforcement is needed, a method of injecting cement liquid or mortar into the foundation has been used. However, in this method, quality assurance and evaluation of a result of the construction is difficult. Moreover, a technique using the injection method that has been used is used to suppress additional subsidence. In addition, when a weak foundation layer is thick or a height for the lifting is large, there is a problem in that excessive costs have to be consumed although the foundation reinforcement of the structure and lifting method can be performed.

In addition, in order to perform a perforating operation for injection, heavy equipments have to be carried in the structure to reach a perforating position, so that the construction is impossible and additional damages may be caused.

In addition, a perforating method using a high pressure air compressor or suspension may cause damages from air pressure and liquefaction of the entire foundation before an injection material is hardened, so that internal force further weakens. In addition, most perforating methods using an auger cannot be applied to an existing structure.

i On the contrary, a method of pressing a steel pipe pile is a vibration/noise free environmental method. In this method, the steel pipe pile is pressed into a predetermined hard layer, and lifting and foundation reinforcement of the structure that subsides can be achieved by the pressed pile. In addition, internal force of a pile uplifting layer and internal force of the pressed pile can be accurately measured. Therefore, the method has advantages to solve the existing problems.

However, when a reaction force apparatus cannot be used for the structure which subsides cannot be used, that is, when a method of pressing the pile as described is applied in a limited and closed space, a specific construction method using a reaction force supporting member for pressing a pile and performing a lifting operation has not been developed, so that demands on the development of the technique has been raised. [Disclosure] [Technical Problem]

The present invention provides a construction method which includes a pile press-in construction method and a foundation reinforcing method, capable of pressing a pile when a bad construction field condition is given and a foundation construction using equipments is difficult, recovering a function of a structure by performing foundation reinforcing and lifting operations on the structure which is constructed on a weak layer and unequally subsides, and lifting only desired and needed parts without removing the structure or disintegrating the structure which needs repair and reinforcement . [Technical Solution]

According to an aspect of the present invention, first, in order to dispose a reaction force supporting member 200, a reaction force hole 120 is perforated at a lower plate 110 of a structure 100, a lower end portion of the reaction force bar 210 such as an iron reinforcing bar or a steel par is inserted into the reaction force hole 120 so as to be fixed to a lower portion of the lower plate 110 of the structure 100, an upper end supporting member 220 which has a round plate shape and is disposed inside the structure 100 is disposed at an upper end portion of the reaction force bar 210 to dispose the reaction force supporting member 200, 210, and 220 at the structure.

In the above aspect of the present invention, a press-in member 300 having a pile shape such as a steel pipe is set into a press-in hole 130 which is perforated at a lower portion of the upper end supporting member 220 into a predetermined depth similarly to the reaction force hole 120, a press- in means 400 including a hydraulic cylinder is disposed to be operated between the press-in member 300 and the upper end supporting member so as to enable the press-in member 300 to be pressed in a lower portion of the structure 100, and a lifting means 500 including a hydraulic cylinder is disposed between an upper portion of the pressed press-in member 300 and an upper plate of the structure 100, so that a lifting operation of the structure that subsides can be performed by the lifting means.

Second, the press-in member 300 pressed in the lower surface of the lifted structure is integrated with the structure 100 and the finishing- processed the reaction force bar 210 to be served as a foundation pile for supporting the structure.

Third, a lifting control system 600 for controlling operations of the lifting means 500 is applied to control a lift degree according to a lifted portion of the structure 100, so that the structure lifting operation can be performed more accurately.

[Advantageous Effects]

When a structure such as a drainage structure which is disposed at a bank, to which external accesses are not provided, and to which only internal operations are provided, subsides, the structure that subsides can be lifted by checking bearing power of ground of the structure. In addition, only parts that subside can be lifted, and an advantage of disposing a permanent foundation pile can be obtained. Therefore, a lifting and foundation reinforcing method used for a structure that subsides which is more efficient and can verify the advantage can be provided. [Description of Drawings]

FIG. 1 illustrates a state where a reaction force hole and a press-in hole are constructed at a lower plate of a structure according to the present invent ion.

FIG. 2 illustrates a constructed state of a reaction force bar according to the present invention.

FIGS. 3 and 4 illustrate a press-in member, a reaction force supporting member, and a press-in means according to the present invention.

FIG. 5 illustrates a lifted state of a press-in member according to the present invention.

FIGS. 6 and 7 illustrate a press-in member lifting system and a lifted state according to the present invention.

FIGS. 8, 9, and 10 illustrate a state where a press-in member and a structure are integrated with each other according to the present invention. [Best Mode]

The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein.

FIG. 1 illustrates a state where a reaction force hole and a press-in hole are constructed at a lower plate of a structure according to the present invention. FIG. 2 illustrates a constructed state of a reaction force bar according to the present invention. FIGS. 3 and 4 are a perspective view an a front view, respectively, illustrating a press-in member, a reaction force supporting member, and a press-in means according to the present invention.

FIG. 5 illustrates a lifted state of a press-in member according to the present invention. FIGS. 6 and 7 illustrate a press-in member lifting system and a lifted state according to the present invention. FIG. 8, 9, and 10 are a front view, a perspective view, and a top view illustrating a state where a press-in member and a structure are integrated with each other, respectively, according to the present invention.

First, as illustrated in FIG. 6, the present invention can be easily applied when a crack or the like is generated by foundation subsidence in a structure which is buried in a bank and has an internal limited and closed space such as a drainage structure 100 (a kind of drainage culvert) that crosses a bank A in a transverse direction, although a space used to lift the structure that subsides is not provided at the outside of the structure and equipments cannot be carried in. In addition, according to the present invention, in order to lift the structure that subsides and maintain the lifted state continuously, a method of pressing a press-in member 300 such as a steel pipe pile that can serve as a foundation pile in a lower foundation of the structure from the internal structure is used.

More specifically, a pile press-in method of pressing a steel pipe pile under the ground using a reaction force by a hydraulic cylinder may be used.

Therefore, according to the present invention, a reaction force supporting member 200 that serves as a reaction force base for pressing a press-in member 300 in a lower foundation of a structure 100 has to be provided to the structure 100.

Accordingly, the reaction force supporting member 200 includes a reaction force bar 210 such as an iron reinforcing bar or a steel bar, of which a lower end portion is mounted to a lower portion of a lower plate 110 of the structure 110 inside the structure 100 and of which an upper end portion is tightened with and fixed to an upper end supporting member 220 inside the structure 110, as illustrated in FIGS.3 and 4.

In order to construct the reaction force bar 210, as illustrated in FIG. 1, a portion of a surface of the lower plate 110 of the structure 100 is cut out, and a reaction force hole 120 is formed at the lower plate 110 of the structure 100 by using a perforator.

A number of the reaction force holes 120 are formed at the lower plate 110 of the structure 100 at predetermined intervals. According to the present invention, 4 reaction force holes 120 are formed to penetrate the lower plate 110 of the structure 100.

Next, a press-in hole 130 is formed at the lower plate 110 of the structure 100 by using a perforator between the reaction force holes 120 so that a portion of the press-in hole 130 overlaps with outer lines of the reaction force holes 120.

The press-in hole 130 is used for setting an initial press-in position of the press-in member 300 such as a steel pipe pile described later.

Next, as illustrated in FIG. 2, a fixing bar 211 including an anchor plate is attached to the lower end portion of the reaction force bar 210 that is the iron reinforcing bar or the steel bar.

Thereafter, the reaction force bar 210 at which the fixing bar 211 is formed is inserted into the reaction force hole 120 so that the fixing bar 211 is engaged with the lower portion of the lower plate 110 of the structure 100 and therefore enables the reaction force bar 210 to resist pull-out force.

A diameter of the reaction force hole 110 is provided so that the fixing bar 211 can be inserted into the reaction force hole 110.

When the setting position of the reaction force bar 210 is set, as illustrated in FIG. 4, the reaction force hole 120 is filled with a filling material 230 such as mortar grouting with high strength in order to enable the lower end portion of the reaction force bar 210 such as the iron reinforcing bar or the steel bar to be fixed to the reaction force hole 110, so that the fixing bar 211 attached to the lower end portion of the reaction force bar 210 serves as a bulb formed in the ground.

Accordingly, four reaction force bars 210 are constructed as the iron reinforcing bars or the steel bars at predetermined intervals inside the structure 100 and protrude to have predetermined heights from the lower plate of the structure 100.

The upper end portions of the reaction force bars 310 are tightened with and fixed to the upper end supporting member 220 which is manufactured as a round plate as illustrated in FIGS. 3 and 4.

More specifically, the upper end supporting member 220 has penetrating holes 221 which are formed to correspond to the number of the reaction force bars 210 and are tightened with and fixed to the upper end portions of the reaction force bars 210 by tightening tools 222 such as tightening nuts.

According to the present invention, the reaction force bar 210 at which the fixing bar 211 is formed and the upper end supporting member 220 are referred to as the reaction force supporting member 200.

A number of the reaction force supporting members 200 may be constructed at the lower plate 110 of the structure 110 at predetermined intervals, and the number thereof may be designed in consideration of a degree of subsidence of the structure 100.

Next, the press-in member 300 which is a steel pipe is initially set at the press-in hole 130 so that the press-in member 300 can be easily pressed in the lower portion of the structure 100 from the set position when the press-in member 300 is exerted with press-in force later.

Conventionally, a steel pipe has such a diameter and a length that a worker can carry and set it in a limited space.

The length of the steel pipe is determined in consideration of a press- in length, and a number of steel pipes may be connected with each other and pressed in.

In a state where the steel pipe is initially set in the press-in hole 130, a head portion supporting plate 310 is selectively constructed at a head portion of the steel pipe, and a press-in means 400 such as a hydraulic cylinder having a predetermined capacity is formed between the upper plate supporting member 220 and the head portion supporting plate 310 so as to enable the press-in member 300 to be pressed in the lower portion of the structure 100.

More specifically, operations of the hydraulic cylinder are restricted by the reaction force supporting member 200, and this causes reaction force to press the steel pipe in the lower foundation of the press-in hole 130.

A press-in length of the press-in member 300 generated from a stroke of a hydraulic cylinder is measured and the numbers of the hydraulic cylinders and filler steel pipes 320 are controlled, so that the steel pipe is pressed in the lower foundation of the structure into a predetermined depth.

The drainage structure according to the present invention is disposed in the fill-up bank. Therefore the pressed-in steel pipe may be pressed so as to be supported by a hard layer.

The steel pipes may be pressed into the same depth according to the lower foundation of the lower plate 110 of the structure 100. However, according to uncertainty of the foundation and the construction operations, the press-in depths and protruding heights from the lower plate 110 of the structure 100 may be different from each other.

After the press-in members 300 that are the steel pipes are pressed in the lower plate 110 of the structure 100, an operation of lifting the structure that subsides is performed by using the pressed press-in member 300.

As illustrated in FIG. 5, a lifting means 500 including a hydraulic cylinder for controlling a lift degree and a lift time is provided to an upper end portion of the press-in member 300. The lifting means 500 has a height from the upper end portion of the press-in member 300 to a lower surface of an upper plate of the structure 100. Conventionally, the hydraulic cylinder may be disposed at the upper end portion of the press-in member 300, and a filler steel pipe may be disposed at the hydraulic cylinder and the lower surface of the upper plate of the structure 100.

The lifting means 500 including the hydraulic cylinder is provided to each press-in member 300 disposed at the lower plate 100 of the structure 100, and according to a size of the structure 100, a number of lifting means 500 may be provided.

A lift length according to a degree of subsidence of the structure 100 needs to be controlled by controlling an operation order, the lift lengths, and the operation times of a number of the lifting means 500. According to the present invention, to do this, as illustrated in FIGS. 6 and 7, oil pressure supplied to the hydraulic cylinder may be controlled by using a lift control system 600 to which each lifting means 500 is connected.

The lift control system 600 may determine oil pressure of each hydraulic cylinder and whether or not oil pressure is to be supplied by controlling an opening and closing operation of a hydraulic hose provided to the hydraulic cylinder that is the lifting means 500. This control system 600 may be manufactured by combining commercial products.

The structure 100 can be lifted to be in a state before the subsidence by using the lifting means 500. It can be seen in FIG. 7 that the structure that subsides is returned to be in an original state by using the lifting means 500 through repeated lift operations.

This can be checked by attaching a strain gauge to the structure 100. Accordingly, the present invention has an advantage in that a state of the structure 100 that is practically returned to be in the original state can be checked in real-time.

After checking the lift of the structure 100, the lifting means 500 is disintegrated in order, and a finishing operation is performed on the pressed press-in member 300.

The press-in member 300 that is the steel pipe should not protrude into the structure, so that a degree of press-in is controlled so that the press- in member 300 does not protrude from the lower plate of the structure. According to a construction filed, the head portion of the steel pipe may be cut to control a height thereof.

Accordingly, first, an inside of the steel pipe that is the press-in member is filled with an internal filling material 330 such as concrete, and the concrete-filled steel pipe may function as a foundation pile of the lifted structure.

However, when the press-in member 300 functions as the foundation pile of the structure 100, the press-in member 300 exerts reaction force Rs in an upward direction toward the structure due to the load of the structure as illustrated in FIG. 8.

When the lower plate of the structure cannot resist the reaction force Rs, a crack due to punching shear force may occur at the lower plate of the structure, and when the crack extends, the crack may have a bad influence on durability of the structure.

Therefore, in order to prevent this situation, according to the present invention, the press-in member 300 is integrated into the reaction force bar 210 fixed in advance and the structure 100 to enable the structure 100 to resist the reaction force exerted from the press-in member 300 that serves as the foundation pile of the structure.

More specifically, a portion of a predetermined length of an upper end portion of the reaction force bar 210 that is the iron reinforcing bar or the steel bar is cut, bent, and welded to overlap with the upper portion of the steel pipe so as to enable the reaction force bar 210 to enclose the upper portion of the steel pipe and enable the press-in member 300 to exert supporting force Tb that resists the reaction force Rs.

In addition, the reaction force bar 210 that is the iron reinforcing bar or the steel bar is integrated with the steel pipe with each other by a connection member 710 including a welded connection plate so as to allow the reaction force bar 210 to be integrated with the press-in member 300 that is the steel pipe.

Next, finishing concrete casting is applied to the perforated portion of lower plate 110 of the structure to fill the lower plate of the structure and enable the lower plate of the final structure and the press-in member to be integrated with each other. Accordingly, the final press-in member 300, the structure 100, and the reaction force bar 210 are integrated with each other to allow the press-in member to function as the foundation pile of the structure. [Industrial Applicability]

According to the present invention, lifting and foundation reinforcement of an under ground structure with all types that subsides, for example, an underground structure that is buried into the foundation such as a basement floor plate of a building structure, can be achieved. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

[CLAIMS] [Claim 1]

A structure lifting and foundation reinforcing method using a press-in member, comprising steps of: forming a perforated hole at a lower surface inside a closed structure; disposing a reaction force supporting member by fixing a lower end fixing portion of a reaction force bar including an iron reinforcing bar into the perforated hole at a lower portion of a lower surface of the structure and fixing an upper portion of the reaction force bar into an upper end supporting member disposed inside the structure! after setting the press-in member into the perforated hole, pressing the press-in member into a lower portion of the structure by constructing a press-in means between an upper portion of the press-in member and the upper end supporting member and operating the press-in means; and lifting the structure by constructing a lifting means on an upper portion of the pressed press-in member. [Claim 2]

The method of claim 1, further comprising performing a finishing operation on the pressed press-in member by integrating the press-in member into the structure and the reaction force bar, after lifting the structure. [Claim 3]

The method of claim 1 or 2, wherein the perforated hole includes a reaction force hole for disposing the reaction force bar and a press-in hole around the reaction force hole for inserting the press-in member. [Claim 4]

The method of claim 1, or 2, wherein the reaction force bar is fixed by inserting the reaction force bar to which a fixing bar including an anchor plate is attached at a lower end portion of the reaction force bar into the reaction force hole to be engaged with the lower surface of the structure and filling a filling material including mortar into the reaction force hole. [Claim 5] The method of claim 1 or 2, wherein the upper end supporting member is a plate through which an upper end portion of the reaction force bar penetrates, and an upper surface of the plate is tightened with and fixed to the upper end portion of the reaction force bar by a tightening tool. [Claim 6]

The method of claim 5, wherein the lifting means controls a lift degree or a lift time according to parts of the structure that subside by simultaneously or individually operating a number of hydraulic jacks. [Claim 7]

The method of claim 6, wherein the press-in member is a steel pipe, and an inside of the press-in member that is the steel pipe is filled with an internal reinforcement material including concrete and is integrated with the structure. [Claim 8]

The method of claim 7, wherein the press-in member that is the steel pipe is integrated into the reaction force bar in one body by a connection member including a connection plate, and an upper portion of the finishing- processed reaction force bar is bent to be integrated thereto to fill the perforated portion of the lower plate of the structure, thereby integrating the press-in member, the reaction force bar, and the structure with each other.