KR20180082226A - Track bearing pile structure for strengthening end bearing capacity to restrain subsidence of soft soil, and construction method for the same - Google Patents

Abstract

Provided are a track supporting pile structure reinforced with supporting force for suppressing settlement of the soft ground and a construction method thereof. In order to suppress the settlement of the soft ground, the present invention can locally strengthen a near-pile layer by forming a reinforced layer by injecting a solid solution into the near-pile layer of a pile, which exhibits bearing capacity of the pile. Accordingly, the present invention can reduce stiffness of a support pile and reduce the overall length of a track support pile. Further, the present invention can quantitatively grasp tip end supporting force by controlling the solidification volume through pressure control of a pressure injector.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a track support pile structure reinforced with a support force for suppressing settlement of soft ground,

The present invention relates to the construction of a track support pile structure, and more particularly, to a method for constructing a track support pile structure, which comprises forming a tip strengthening layer by injecting a hardening material into a near- The present invention relates to a track supporting pile structure reinforced with a supporting force for restraining settlement of a ground and a construction method thereof.

Generally, the constituent soil layers of soft ground consist of soft and compressible clay, silt, and pit with N values of 0 to 4 in the standard penetration test. For example, these soft grounds are triangular, Valley), and so on. Also, it is also soft soil that contains water in the loose sand layer of N <10.

In addition, in order to construct various structures, it is necessary to reinforce the soft ground where the structure is constructed so as to prevent the uneven settlement while stably supporting the surface load of the structure. Therefore, , Reinforcement methods of various types are disclosed in the prior art according to the use purpose and the foundation structure of the soft ground.

 This soft ground measures method can be roughly divided into improvement method and supporting pile method. For example, improvement methods include sand drain method, vertical drain method, paper drain method, pack drain method, sand compaction pile method, dynamic compaction method, and compressive soil method. It is a method of constructing the embankment and superstructure by supporting the pile on the hard ground below the soft ground and installing geosynthetic fiber on the upper part of the pile. In this soft ground improvement method, if the improvement depth is too deep or the improvement range is wide, it takes a lot of time and cost. Therefore, recently, the steel pipe piling method, which is commonly used in buildings, And the number of cases is increasing.

Specifically, as foundation work for construction work in soft ground, piles (or piles) are inserted into the ground to support the load of the structure. These piles can be divided into supporting piles and friction piles, classified according to their properties.

In addition, the friction pile supports the load by the frictional force between the surrounding ground and the pile. In particular, the supporting pile is supported by a large number of bridges I am using it.

1 is a view for explaining a method of constructing a support pile according to a conventional technique.

As shown in FIG. 1, the method for constructing a support pile according to the related art is a construction of a large diameter having a diameter of 1000 mm or more, wherein a) a hole h1 is formed in the soft ground 11 so as to reach a rock layer, Lt; / RTI &gt; b) drilling a hole (h2) in the rock layer (12) to a certain depth; c) disposing a reinforcing bar 13 on the edge side of the holes h1 and h2 formed in the soft ground 11 and the rock layer 12, respectively; And d) pouring the concrete (14) into the perforated holes (h1, h2) to form a supporting pile into which the reinforcing bars (13) are inserted.

In a conventional method for constructing a support pile, a typical operation in the rock layer 12 is to install several hammer drills or hammer drills coupled to a drum stabilizer of a pile drilling machine to form a rock layer 12, To puncture the hole (h2) with a large diameter of 1000 mm or more.

The drilling of the hole (h2) in the rock layer (12) with the large diameter in this manner requires a long period of time due to problems such as frequent replacement of the hammer bit, which is expensive equipment, Since the whole of the hole h2 must be filled with the concrete 14, there is a problem that the cost of construction is increased due to a large consumption of concrete.

On the other hand, when the concrete track is applied on the soft ground to lay the high-speed railway or the general railway, the soft ground handling is very important in terms of the stability of the railway vehicle, ride comfort,

When a ground settlement occurs in such a concrete track section, a track misalignment such as a vertical misalignment, a horizontal misalignment, and a torsion are intensified and the running stability and ride quality of the vehicle are deteriorated. In addition, cracks or breakage of the concrete slab, There is a problem that it is difficult to maintain the function as a railway line. Accordingly, such a soft ground can be improved or replaced, or the excavation can be performed by changing the design of the earth section to the bridge section.

However, the improvement / replacement of the soft ground / bridging of the earth can not suppress the long-term settlement of the ground, and it is inevitable to increase the soft ground treatment cost, bridge construction cost or maintenance cost. In order to maintain the upper level of the rail at the occurrence of subsidence, various maintenance work such as additional installation of the rail fixing device, reinforcement of concrete slab, lifting of concrete track (filling of the concrete slab, etc.) There is a problem that the maintenance cost is excessively increased.

In order to solve these problems, a concrete track construction method capable of suppressing settlement of soft ground is being developed.

FIG. 2 is a vertical sectional view showing a structure of a track support pile according to a conventional technique, and FIG. 3 is a diagram for explaining application of a large diameter pile for minimizing the number of track support piles.

2 and 3, the track support pile structure according to the prior art includes a rock support layer 31 such as a weathered rock or soft rock, a soft ground 32, a PHC pile 21, a beam 22, A platform slab 23, a protective concrete layer 33, a concrete slab 34, a rail 35 and an embankment layer 36. In particular, as shown in Fig. 3, the PHC pile 21 A large diameter pile, for example, Φ = 1,000 mm or 1,200 mm, is applied to minimize the number of required loads.

As a prior art related to the above-described track supporting pile structure, Korean Patent Laid-Open Publication No. 2009-84054 discloses an invention entitled " a concrete track structure reinforced with a pile foundation and a construction and maintenance method thereof " 4.

4 is a cross-sectional view showing a concrete track structure reinforced by a pile base according to a conventional technique.

As shown in FIG. 4, the concrete pavement-reinforced concrete pavement structure according to the related art is installed on the ground and the pile 61 is joined to the concrete pavement so as to behave integrally with the concrete pavement.

The pile 61 may be a pre-cast member or a cast-in-place pile. In this case, the pile 61 may have a reinforced reinforced cast-in-place pile having a pore size of 100 tons or more. For example, when the pile 61 is used as a tip pile, the pile 61 serves to transmit the upper load to the bedrock layer 51 where no settlement occurs. Therefore, And is installed at a sufficient depth to reach the upper surface of the bedrock layer 51. The use of such a tipped pile is suitable for supporting structures such as concrete tracks that are difficult to settle because the residual settlement is not large for long-term loads. In addition, the pile 61 may be disposed according to the characteristics of the vehicle acting as the overhead load, and may be disposed at a distance of about half of the maximum baryment distance to prevent excessive bending stress from occurring.

The pile cap 62 may be installed on the upper portion of the pile 61 to prevent cracks due to the load concentrated on the head portion of the pile 61 by installing the pile cap 62, It is possible to achieve an integral joint with the concrete track installed in the concrete pavement.

The concrete track supported by the pile 61 includes a cam plate 63 coupled to the upper portion of the pile cap 62 and a hydraulically stabilized base layer 63 disposed to be embedded in the cam plate 63. [ HSB layer 64 and a track concrete layer 65 formed by pouring concrete on the HSB layer 64. As shown in FIG. A tie rail 66 is installed on the upper surface of the TCL layer 65 and a rail 67 is fixed to the upper surface of the tie rail 66.

The concrete pavement is installed on the upper surface of the roadbed layer 53. The concrete pavement 61 is integrally formed with the pile 61 or the pile cap 62, The reinforcing concrete can be installed so that the head or pile cap 62 is embedded.

The cam plate 63 is integrally joined to the head portion of the pile cap 62 or the pile 61 so that the HSB layer 64 and the TCL layer 65, which are applied to the upper portion of the cam plate 63, Suppresses displacement, and distributes the load. In addition, the cam plate 63 is embedded in the HSB layer 64 placed in the upper portion to serve as a shear key, thereby preventing slipping of the HSB layer 64.

The HSB layer 64 can be formed on the upper surface of the cam plate 63. The HSB layer 64 is formed by placing concrete over the cam plate 63 and the upper surface of the roadbed layer 53. The HSB layer 64 serves as a base of the TCL layer 65 installed on the HSB layer 64. The HSB layer 64 is formed on the cam plate 63 connected to the roadbed layer 53 and the pile 61 And are joined together to support the TCL layer 65.

The concrete is placed on the upper surface of the HSB layer 64 to construct the TCL layer 23. The tie layer 66 is fixed to the TCL layer 65 and the rail 67 Is fixed.

According to the concrete track structure reinforced by the pile foundation according to the prior art, uneven settlement of the roadbed can be suppressed and the settlement can be effectively suppressed by the foundation of the pile without separately reinforcing or treating the ground layer. In particular, since the settlement of the roadbed layer is suppressed, it is possible to reduce the construction cost by alleviating the criteria of the fillet constituting the roadbed layer. Further, when additional settlement occurs, a space formed on the bottom of the track can be easily maintained and repaired by filling with a filler.

On the other hand, the track-supported pile structure should be free from deflativity and strengthen the bearing capacity so as to provide a stable and efficient function.

5 is a view for explaining the bearing capacity of the track support pile.

Referring to FIG. 5, the track support pile structure does not perform soft ground treatment separately such as improvement and replacement. However, the occurrence of the flattening force due to the soft ground settlement reduces the pile support force, and the upper structure such as the support pile body, . Therefore, the surface of the support pile should be capped or chemically treated so that the surface of the support pile is smooth so as to eliminate the possibility of occurrence of the non-flatness.

In order to suppress the settlement of the soft ground, the supporting structure of the supporting pile tip is very important in relation to the strengthening of the end support force, and as shown in FIG.

Korean Unexamined Patent Publication No. 2009-84054 (published on Aug. 5, 2009), entitled "Concrete track structure reinforced by pile foundation, method of construction and repair thereof" Korean Patent Publication No. 2010-99984 (published September 15, 2010), entitled "Method of constructing large diameter support pile in rock bed" Korean Patent No. 10-884285 filed on Sep. 3, 2008, entitled "Curing Agent for Improving Soft Ground, Ultra High Pressure Water Injection Apparatus and Method for Improving Soil Using the Same" Korean Patent No. 10-940802 filed on Apr. 29, 2009, entitled "Curing Agent for Improving Soft Ground and Its Deep-Mixing Treatment Apparatus and Deep Mixing Treatment Method Using the Same" Korean Unexamined Patent Publication No. 2002-35369 (published May 11, 2002), entitled "Method of Construction of Foundation Pile with Lower Support" Korean Patent No. 10-657613 filed on May 16, 2006, entitled "Soft ground support force strengthening device including geosynthetic fiber installed in pile head"

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a pile of the present invention, which is capable of locally strengthening a near- And to provide a track supporting pile structure reinforced with a supporting force for restraining settlement of soft ground, and a construction method thereof.

Another object of the present invention is to provide a method for controlling the settlement volume of a soft ground by quantitatively grasping the end bearing capacity by controlling the solidification volume through the pressure control of the pressure injector when forming the tip strengthening layer at the tip of the track support pile The present invention provides a track supporting pile structure having improved support force for the ends and a construction method thereof.

As a means for achieving the above technical object, a track supporting pile structure reinforced with a leading end supporting force for restraining settlement of a soft ground according to the present invention comprises: a high strength prestress (PHC) pile capping or surface chemically treated; A tip strengthening layer formed by injecting a hardening material into the rock support layer at the tip of the PHC pile using a pressure injector to strengthen the tip supporting force of the PHC pile; A cross beam mounted on the top of the PHC pile; A platform slab installed on the beam; And a top structure constructed on the platform slab so as to form a track supporting pile structure, wherein the top strengthening layer is formed by pouring high solubility into a near-pile layer of a pile showing the supporting capacity of the track supporting pile And the reinforcing layer of the pile is locally strengthened.

Here, the PHC pile is a high-strength prestressed pile capping or surface-treated, and is preferably a large diameter pile having a diameter of 1,000 mm or more to minimize the required number.

Here, the tip strengthening layer can control the solidification volume through the pressure control of the pressure injector so as to quantitatively grasp the end bearing force of the support pile.

Here, the high solubility material is supplied from a high solubility injection device via an injection tube, and the pressure injector injects the high solubility material into the upper surface of the rock support layer by pressure injection, so that the PHC pile can be converted into a rock-bottoming pile.

Here, the upper structure may include: a protective concrete layer formed by casting concrete on the platform slab; A concrete slab disposed above the protective concrete layer; And a rail installed on the concrete slab.

As another means for accomplishing the above technical object, there is provided a method of constructing a track support pile structure having enhanced tip support for suppressing settlement of soft ground according to the present invention, comprising the steps of: a) capping or surface chemical treatment of a PHC pile ; b) installing a steel casing on the soft ground; c) embedding the PHC pile in the steel casing; d) removing the steel casing and injecting solid support into the rock support layer at the tip of the PHC pile using a pressure injector to form a tip strengthening layer; e) mounting a cross beam over the PHC pile; f) constructing a platform slab above the beam; And g) forming an orbital support pile structure by constructing a superstructure. In order to suppress settlement of the soft foundation, a pile hardening layer is formed by injecting a hardening material into a near-pile layer of the pile, Whereby the near-pile layer is locally strengthened.

According to the present invention, it is possible to locally strengthen the near-pile layer by forming the tip strengthening layer by injecting the solid solution into the near-pile layer of the pile, which exhibits the end support force of the track support pile, And can reduce the overall length of the track support pile.

According to the present invention, the tip end holding force can be quantitatively grasped by controlling the solute volume through the pressure control of the pressure injector.

1 is a view for explaining a method of constructing a support pile according to a conventional technique.
2 is a vertical cross-sectional view showing a structure of a track support pile according to a conventional technique.
3 is a view for explaining application of a large diameter pile for minimizing the number of track support piles according to the prior art.
4 is a cross-sectional view showing a concrete track structure reinforced by a pile base according to a conventional technique.
5 is a view for explaining the bearing capacity of the track support pile.
FIG. 6 is a side cross-sectional view of a track support pile structure reinforcing the tip end supporting force for restraining settlement of the soft ground according to the embodiment of the present invention.
FIG. 7 is a front cross-sectional view of a track support pile structure reinforcing the tip end supporting force for restraining settlement of soft ground according to an embodiment of the present invention.
FIG. 8 is a flowchart illustrating a method of constructing a track support pile structure in which the leading end supporting force is strengthened to suppress settlement of a soft ground according to an embodiment of the present invention.
FIGS. 9A to 9F are views for explaining a concrete method of constructing a track supporting pile structure in which the tip supporting force is strengthened to suppress the settlement of the soft ground according to the embodiment of the present invention.
FIG. 10 is a view showing a state in which a track support pile structure having a stronger end support force is installed for suppressing settlement of a soft ground according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Track support pile structure reinforced with support for soft ground settlement suppression]

FIG. 6 is a side cross-sectional view of a track support pile structure reinforcing the tip end support force for restraining settlement of soft ground according to an embodiment of the present invention. FIG. 7 is a cross- Sectional view of a reinforced track support pile structure.

6 and 7, a track supporting pile structure 100 reinforcing the leading end supporting force for restraining settlement of soft ground according to an embodiment of the present invention includes a PHC pile 110, a tip strengthening layer 160, A cross beam 170, a platform slab 180, a protective concrete layer 230, a concrete slab 240, a rail 250 and an embankment layer 260.

The PHC pile 110 is a high strength prestressed concrete (PHC) pile capping or surface chemically treated to the top of the rock support layer 210. Here, the PHC pile is one of pre-cast piles manufactured by using the centrifugal force by the pretension method. The pile is provided with a compressive force, that is, a prestress, and a defect of concrete that is weak in bending or tensile force It is a high strength prestressed pile with a compressive strength of 800kg / ㎠ or more to compensate. The PHC pile 110 is preferably a large diameter pile having a diameter of 1,000 mm or more to minimize the required number.

The tip strengthening layer 160 is formed by injecting a hardening material into the rock support layer 210 at the tip of the PHC pile 110 by using the pressure injector 150 to strengthen the tip supporting force of the PHC pile 110 . Accordingly, the tip strengthening layer 160 is formed by injecting a hardening material into the near-pile layer of the pile which exhibits the leading end supporting force of the track supporting pile in order to suppress the settlement of the soft ground 220, . In addition, the tip strengthening layer 160 can control the solidification volume through the pressure control of the pressure injector so as to quantitatively grasp the tip end supporting force of the support pile. For example, The PHC pile 110 is injected from the PHC pile 110 through the injection pipe 130 and the pressure injector 150 injects the high solubility material into the upper surface of the rock support layer 210 at the tip of the PHC pile 110, The pile 110 may become a rock-pierced pile.

Here, the above-mentioned high solubility materials are mainly used for cementing soft ground or soil in the field. In order to fill the pores formed after the perforation of the ground or naturally formed pores and to form a water wall for blocking the ground water, .

A crossbeam (170) is mounted on top of the PHC pile (110). At this time, the embankment layer 260 may be formed on the upper portion of the soft ground 220 on the side of the cross bar 170 as shown in FIG.

A platform slab 180 is installed on the beam 170.

The superstructure is constructed on the platform slab 180 to form an orbital support pile structure. At this time, the upper structure includes a protective concrete layer 230 formed by placing concrete on the platform slab 180; A concrete slab 240 disposed above the protective concrete layer 230; And a rail 250 mounted on the concrete slab 240.

As a result, according to the track support pile structure 100 in which the leading end supporting force is strengthened to suppress the settlement of the soft ground according to the embodiment of the present invention, the high pouring solution is injected into the near- Layer, it is possible to locally strengthen the near-pile layer, thereby reducing the stiffness of the support pile and reducing the overall length of the orbital support pile. Further, by controlling the volume of the solid solution through the pressure control of the pressure injection device, the tip end holding force can be grasped quantitatively. At this time, it is preferable to carry out the preload test.

[Method of Supporting Pile Structure Supporting Strong Bearing Capacity for Suppression of Subsidence in Soft Soils]

FIG. 8 is an operational flowchart of a method of constructing a track support pile structure in which the leading end supporting force is strengthened in order to suppress settlement of a soft ground according to an embodiment of the present invention. FIGS. 9A to 9F are cross- FIG. 10 is a view for explaining a concrete method of constructing a track supporting pile structure having a strong bearing capacity for restraining settlement. FIG. 10 is a view for explaining a method of constructing a track support pile structure Fig.

Referring to FIG. 8, in order to suppress the settlement of the soft ground according to the embodiment of the present invention, a method of constructing a track supporting pile structure with enhanced leading end bearing capacity includes: capping or piling a Pretensioned Spun High Strength Concrete (PHC) pile 110; Surface chemical treatment is performed (S110). Specifically, the PHC pile 110 is a high strength prestressed concrete (PHC) pile capping or surface chemically treated. It is preferable to use a large diameter pile having a diameter of 1,000 mm or more to minimize the required number, Further, as shown in FIG. 9A, the surface treatment layer 111 may be formed on the surface of the PHC pile 110.

Next, the steel casing 120 is installed on the soft ground 220 (S120). Specifically, as shown in FIG. 9B, the steel casing 120 is inserted through the soft ground 220 to the upper surface of the rock support layer 210.

Next, as shown in FIG. 9C, the PHC pile 110 is embedded in the steel casing 120 (S130).

Next, the steel casing 120 is removed and a hardening material is injected into the rock support layer 210 from the tip of the PHC pile 110 by using the pressure injector 150 to form a tip strengthening layer 160 (S140). Specifically, as shown in FIG. 9D, it is possible to control the solidification volume through the pressure control of the pressure injector so as to quantitatively grasp the end supporting force of the support pile, The PHC pile 110 is supplied from the apparatus 130 via the injection pipe 140 and the pressure injector 150 injects the high solubility material into the upper surface of the rock support layer 210, Pegged.

Next, as shown in FIG. 9E, the cross beam 170 is mounted on the PHC pile 110 (S150).

Next, as shown in FIG. 9F, a platform slab 180 is installed on the cross beam 170 (S160).

Next, the upper structure is constructed to form a track supporting pile structure (S170). Specifically, as shown in FIG. 10, the upper structure includes a protective concrete layer 230 formed by pouring concrete on the platform slab 180; A concrete slab 240 disposed above the protective concrete layer 230; And a rail 250 mounted on the concrete slab 240 so that the railroad car 300 can travel.

In order to suppress settlement of the soft ground, the method of constructing the track support pile structure with enhanced tip support force according to the embodiment of the present invention is characterized in that, in order to suppress the settlement of the soft foundation site 220, The hardened layer 160 can be locally strengthened by injecting the solid solution to form the tip strengthening layer 160.

As a result, according to the embodiment of the present invention, since the condition of the leading end support layer does not necessarily need to be light rock or soft rock, the support pile can be reduced and the overall length of the track support pile can be reduced. Further, according to the embodiment of the present invention, the tip end holding force can be quantitatively grasped by controlling the solute volume through the pressure control of the pressure injector.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: track supporting pile structure
110: PHC peg
111: Surface treatment layer
120: Steel casing
130: high solubility injection device
140: Injection tube
150: Pressure injector
160:
170: Cross Beam
180: Platform Slab / Bearing Slab
210: Bearing Stratum
220: Soft Soil
230: Protective Concrete Layer
240: Concrete Slab Track
250: Rail
260: buried layer
300: railway vehicle

Claims (10)

A Pretensioned Spun High Strength Concrete (PHC) pile 110 that is capped or surface chemically treated;
A tip strengthening layer 160 formed by injecting a high solubility material into the rock support layer 210 at the tip of the PHC pile 110 by using the pressure injector 150 to strengthen the tip supporting force of the PHC pile 110;
A crossbeam 170 mounted on the upper portion of the PHC pile 110;
A platform slab 180 installed on the beam 170; And
An upper structure (not shown) mounted on the platform slab 180 to form an orbital support pile structure
&Lt; / RTI &gt;
The tip strengthening layer 160 is formed by injecting a hardening material into a near-pile layer of a pile which exhibits a leading end supporting force of a track support pile for restraining settlement of the soft ground 220, and locally reinforces the pile near- Supported pile structure strengthening the bearing capacity for suppression of soft ground settlement. The method according to claim 1,
The PHC pile (110) is a high strength prestressed concrete (PHC) pile capping or surface chemically treated. The PHC pile is a large diameter pile having a diameter of 1,000 mm or more to minimize the required number of piles. Supported pile structure reinforced with tip support force. The method according to claim 1,
Wherein the tip strengthening layer (160) controls the volume of the hardening solution through control of the pressure of the pressure injector so as to quantitatively grasp the end bearing force of the support pile. Pile structure. The method of claim 3,
The solidifying material is supplied from the solid solution injecting device 130 via the injection pipe 140. The pressure injecting device 150 injects pressure of the solid solution at the front end of the PHC pile 110 to form a rock supporting layer 210 And the PHC pile 110 is formed into a rock-bottom pile by injecting the PHC pile 110 into the upper surface of the pile structure. The method according to claim 1,
The upper structure includes a protective concrete layer 230 formed by placing concrete on the platform slab 180; A concrete slab 240 disposed above the protective concrete layer 230; And a rail (250) installed on the concrete slab (240). The orbital supporting pile structure is reinforced with a supporting force for suppressing settlement of the soft ground. a) capping or surface-treating the pile 110 with a Pretensioned Spun High Strength Concrete (PHC);
b) installing a steel casing (120) on the soft ground (220);
c) embedding the PHC pile (110) in the steel casing (120);
d) The steel casing 120 is removed and a hardening material is injected into the rock support layer 210 from the tip of the PHC pile 110 by using the pressure injector 150 to form the tip strengthening layer 160 step;
e) mounting a cross beam (170) over the PHC pile (110);
f) installing a platform slab (180) over the beam (170); And
g) constructing a track-supported pile structure by constructing a superstructure;
, &Lt; / RTI &
In order to suppress the settlement of the soft ground, it is necessary to strengthen the near-pile layer by locally strengthening the pile by forming a reinforced layer by injecting solid solution into the near- A Method of Construction of Track Supported Pile Structures with Enhanced Bearing Capacity. The method according to claim 6,
The PHC pile 21 in step a) is a high strength prestressed concrete (PHC) pile capping or surface chemically treated, and a large diameter pile having a diameter of 1,000 mm or more is used to minimize the required number of piles A method of constructing orbital support pile structure strengthening the bearing capacity for restraining settlement of soft ground. The method according to claim 6,
Wherein the pile volume of the pile is controlled by controlling the pressure of the pressure injector so as to quantitatively grasp the pile bearing capacity of the pile in step d) . 9. The method of claim 8,
The solidifying material is supplied from the solid solution injecting apparatus 130 via the injection tube 140. The pressure injecting apparatus 150 injects the solid solution into the upper surface of the rock supporting layer 210 by pressure spraying, A method of constructing a track-supported pile structure having enhanced bearing capacity for restraining settlement of a soft ground. The method according to claim 6,
The upper structure includes a protective concrete layer 230 formed by placing concrete on the platform slab 180; A concrete slab 240 disposed above the protective concrete layer 230; And a rail (250) installed on the concrete slab (240), the method comprising the steps of:

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