KR20170005991A

KR20170005991A - soil retaining wall using PHC pile and its construction method

Info

Publication number: KR20170005991A
Application number: KR1020150096273A
Authority: KR
Inventors: 김형민
Original assignee: 김형민
Priority date: 2015-07-07
Filing date: 2015-07-07
Publication date: 2017-01-17

Abstract

An objective of the present invention is to provide a soil retaining wall using a PHC pile and a constructing method thereof which weld and fixate brackets, waling, and timbering on circular steel pipes by installing the circular steel pipes at intervals of three or four PHC piles without changing a structure of the PHC piles when using the PHC piles to construct a soil retaining wall to reduce construction costs and a construction time. The soil retaining wall using the PHC pile comprises: PHC piles installed along a boundary surface of the ground in a line; circular steel pipes arranged at intervals of three or four PHC piles; brackets welded and installed in the circular steel pipes; waling installed in the brackets; and timbering installed in the waling on positions where the brackets are installed to form regular intervals on the waling. The bracket comprises: a flat unit wherein one end thereof is welded to an outer circumferential surface of the circular steel pipe, and the waling installed in an upper portion thereof to be welded on an outer circumferential surface of the circular surface of the circular steel pipe to support waling and timbering; and a support unit extended from the flat unit and inclined downwards, wherein an end thereof is welded to the outer circumferential surface of the circular steel pipe to have bearing power.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a soil retaining wall using a PHC pile,

The present invention relates to an earth retaining wall using a PHC file and a method of constructing the same. More particularly, the present invention relates to a method of constructing an earth retaining wall using a PHC file and installing a circular steel pipe at three or four PHC files at the time of constructing the earth retaining wall, The present invention relates to a retaining wall using a PHC pile and a method of constructing the same.

Generally, the wall of the retaining wall is roughly divided into two types, namely, a temporary retaining wall type and a permanent retaining wall type wall.

In order to construct an underground structure, the above-mentioned temporary earth retaining type resists against side pressure such as earth pressure and hydraulic pressure during underground erosion work, and is installed for the purpose of subsidence of surrounding ground and protection of adjacent structures. It is made up of a guard that supports the wall to prevent conduction. The wall separates the wall and the type and method of the guard.

Soil cement walls (SCW), cast-in-place piles (CIP), cast-in-place piles (SCW) ), And underground continuous wall (Diaphragm Wall, Slurry Wall). There are various types of girders, such as brace method, ground anchor method, and soilless nailing.

In general, the H-beam + soil plate is installed in a place where groundwater does not exist, and the remaining method is used where groundwater exists.

The earth retaining walls composed of H-beams and soil plates were drilled in the ground using auger equipment, and H-beams were installed at predetermined intervals along the excavation surface boundary. The excavated soil plate was sandwiched between both H- It is a construction method that is used as a retaining wall. Wood is mainly used as a soil board.

A steel sheet pile wall is a method of forming a retained wall by continuously installing a sheet pile steel with a vibrating hammer drill so that it is inserted into the ground and held to each other.

The site-pierced concrete pile (CIP) is constructed by drilling the ground using auger equipment, inserting H-shaped steel at predetermined intervals along the excavation surface boundary, bored in the same way, then assembling and inserting the reinforcing net Cement mortar or concrete is placed on site to form a pile to form a temporary wall.

In the SCW, three piles of ground were drilled using triaxial auger equipment, and at the same time, cement mortar was added and agitated to form soil peculiar mixed piles in the ground. In one hole, H- So that it is repetitively constructed so as to be punched in one by one, thereby forming a heat-driven earth retaining wall.

The underground continuous wall is constructed by excavating the ground of the wall part while inserting stabilizing liquid (bentonite) to prevent the collapse of the excavation surface and penetration of groundwater, inserting the reinforcing bar net, and then pouring concrete to form a reinforced concrete continuous wall It is a public law.

In addition, the permanent retaining wall type resists horizontal pressure against lateral pressure such as earth pressure and water pressure by blocking vertical slopes or hills such as slopes or hills which are intended to stop for the purpose of constructing exposed structures such as structures and roads, It is constructed with the purpose of protection of the structure. It is composed of the earth retaining wall which directly touches the earth and the earth guard which supports the conduction of the wall, and it is classified according to the material and the method of the earth guard wall.

Types of retaining walls that are widely used today include a gravity retaining wall made of concrete and stable by its own weight, a front wall, which is a continuous wall acting as a cantilever, and a front sheath plate, A cantilever retaining wall composed of cantilever retaining walls, and a sub-wall retaining wall having front and rear walls for reinforcing the front wall because the bending moment of the front wall of the cantilever retaining wall increases and the thickness of the lower end increases.

On the other hand, a method of using a PHC file, which is a type of an existing concrete pile, has been proposed instead of a pile as an excavation pile in a retaining wall. In order to use the PHC file as an earth retaining wall, it is necessary to solve the problem of installing a bracket for supporting a wale band. That is, in the case of conventional CIP or SCW, the concrete is removed from the exposed pile by excavating the ground, the surface is taken so that the H-shaped steel inserted into the stress bearing material is exposed, and then the bracket is welded However, since the PHC file is made of concrete only, there is a problem that the method applied in the conventional CIP or SCW can not be applied as it is.

In order to solve the problems of the conventional installation method of the piling-type earthed wall, Korean Patent Registration No. 10-1078080 proposed a retaining wall using pile and ground reinforcement and a construction method thereof.

Japanese Patent Registration No. 10-1078080 discloses a method of fixing a wedge-shaped mounting member to a cylindrical supporting pile, fixing a mounting member and a supporting pile to a bolt hole through a bolt, fixing the wedge to the mounting member, Or the end of the support member is positioned between the support pile and the installation member, and the installation member, the support member, and the support pile are fastened and fixed to the bolt hole while the bolt passes through the support member, to be.

However, if the inserted file does not maintain a constant horizontal level, a bolster hole in the support pile is also required to provide a stepped reinforcement to adjust the height of the supporting pile, There is a gap between the bolt head and the bolt head, so that it is necessary to fit the arcuate fitting member for pressing and filling the space. In this case, after the bolt tightening and the irregularity due to the machining of the arc- There is a problem that it is unstable that the belt is pressed to the support pile as a structure that can reach this wale.

In order to solve the above problems, Korean Patent No. 10-0973601 has proposed a bracket for supporting a wale of a retaining wall and a method of using the bracket for supporting the wale of a retaining wall.

No. 10-0973601 discloses a method of manufacturing a pile having an H-shaped pile or an exposed concrete pile surface of an exposed retaining wall having a flat portion and a leg portion bent at a right angle from the flat portion, Wherein the legs have a fixed channel formed in at least one hole and a first end inserted into the space surrounded by the flat portion and the leg portions, a second end inserted into the hole formed in the leg portions, And a pair of support bent ribs each having a multi-stepped bent portion connecting the second end portions.

However, in the field application of Registration No. 10-0973601, when recycling is possible and the working time can be shortened, if the inserted state of the wall pile is returned to a certain extent without looking straight at the excavation face, When the bracket bolts are fastened to the brackets, the support bending steel rods are also installed in such a state that they are rotated by that angle.

In addition, the existing PHC wall pile has a circular cross-section at the contact point between the earth retaining wall pile and the H-beam band for installation of the support material. Since the contact surface with the wale is a point-to- Is transferred in the form of wedge to cause stress concentration.

Also, Korean Patent No. 10-0975033 has proposed a method of constructing a retaining wall using a pile-type pile.

Patent No. 10-0975033 discloses that a cap beam for integrally fixing the upper end of a wall pile is made of H-shaped steel, and a connecting device is provided in the abdomen to secure a plurality of holes for grouting and a pile more securely. Wherein the connection device comprises a hollow tube coupled to a lower surface of the head plate and a lower surface of the head plate, and a filler filled in the hollow tube, the method comprising the steps of: .

However, in the registered patent No. 10-0975033, since there is no lifting hook on the wall pile formed of concrete, the piling work of the wall pile is not smooth and the working time is long.

Also, since the bolt holes connecting the socket to the wall pile are formed to be spaced apart from each other, if the height of a plurality of wall piles buried in the ground is not precise, the banding through the installation member fixed to the wall pile can not maintain the horizontal There is a problem that the upper surface of the wall pile is to be fixed by using steel or reinforced concrete, and when the exposed surface of the wall pile can not be kept horizontal, the upper surface must be cut to maintain the horizontal.

In addition, it is difficult to work such as to make a large hole in the cap beam of the H-shaped section and to fix it in the inner hollow hole in order to integrate the file by covering the upper part of the file by using the H-shaped cap beam.

In view of such conventional defects, Korean Patent Registration No. 10-1302743 has proposed a method for constructing a pile wall pile for a wall pile and a pile wall using the same.

Japanese Patent Registration No. 10-1302743 discloses that a lifting guide member to which a lifting hook and an auxiliary wire are coupled at an end of a pile is formed so as to safely and smoothly lifting a pile, The brackets are welded so that the strips can be kept horizontal regardless of the depth of the piles buried in the ground, and the steel plates contacting with the wales are subjected to a straight line so that stress can be prevented from concentrating.

However, in Japanese Patent No. 10-1302743, when the straight surface formed on the outer circumferential surface of the pile is inserted, and when the excavation surface is slightly turned without looking straight at the front, problems may occur when the bolt is fastened to the nut. That is, there is a problem that it is difficult to work such as a long work time.

Korean Patent No. 10-1078080, retaining walls using supporting piles and ground reinforcement, and methods of construction thereof. Korean Patent No. 10-0973601, bracket for supporting a wale of a retaining wall, and method of using the same. Korean Patent No. 10-0975033, Construction method of earth retaining wall using pheichse pile. Korean Patent No. 10-1302743, a method of constructing a pile of pile for pile wall and a pile wall using the same.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art described above, and it is an object of the present invention to provide a method and system for updating a PHC file, The present invention is to provide a retaining wall using a PHC pile and a construction method thereof by which a bracket, a wale and a girder can be welded and fixed to the round steel pipe by installing a steel pipe, thereby reducing a construction cost and a construction period.

According to an aspect of the present invention, there is provided an earth retaining wall using a PHC file, comprising: a PHC file to be installed in a line along an interface of a ground; A circular steel pipe constructed to be disposed one by one between 3 and 4 of the PHC file; A bracket welded to the round steel pipe; A wrist strap installed on the bracket; And a bracket installed on a wale at a position where the bracket is installed to be spaced apart from the wale band at a predetermined interval, wherein the bracket comprises: a circular steel pipe, one end of which is welded to the outer circumferential surface of the circular steel pipe, A flat plate portion welded to an outer circumferential surface of the flat plate portion and capable of providing a wale on an upper portion thereof; And a support portion extending from the flat plate portion so as to be inclined downward and having an end welded to an outer circumferential surface of the circular steel pipe to provide a supporting force.

It is preferable that a reinforcement piece is provided on the inner side of the belt to which the support is installed and a finishing plate is provided on the end of the support to be contacted with the wale.

The circular steel pipe is preferably a coated round steel pipe.

According to another aspect of the present invention, there is provided a method of constructing an earth retaining wall using a PHC file, the method comprising: drilling the ground in a line by using a punching machine appropriately selected according to the ground characteristics and the perforation length along a boundary surface of the earth to be ground; Inserting a PHC file in a perforated hole in a row; Inserting a circular steel pipe so that the circular steel pipes are arranged one by one between a predetermined number of the PHC files inserted in a line; Welding the bracket to the round steel pipe; And installing braces on the brackets and installing braces on the braces at regular intervals.

And installing a finishing plate at the end of the girder which is installed in contact with the wales in the step of installing the supporter in the welt, wherein the reinforcing element is installed inside the girth where the girder is located.

In the step of inserting the round steel pipe, it is preferable that the round steel pipe is installed so as to be disposed one by one between three to four PHC piles.

In the step of inserting the round steel pipe, it is preferable to use a round steel pipe coated with the round steel pipe.

According to the earth retaining wall using the PHC file and the method of constructing the same according to the present invention, by installing the circular steel pipes one by one at intervals of 3 to 4 PHC files, brackets can be welded to the round steel pipes to easily install the wales and girders. And it is possible to widen the interval of the support, thereby reducing the construction period and construction cost.

Further, in the present invention, since the vertical gap between the girders can be widened more widely than in the conventional method, that is, in the case of the general CIP method, the gap between the girders is not more than 3 m. However, the present invention forms a sheeting wall Thus, the upper and lower spaces between the support beams can be extended by 4 to 4.5 m or more, which can greatly reduce the material, thereby making it possible to construct one underground floor at a time. That is, in the case of the CIP method, it is necessary to install and disassemble several times before forming the slab, but the present invention can be performed by one step.

1 is a perspective view showing the structure of an earth retaining wall using a PHC file according to the present invention,
FIG. 2 is an exploded perspective view of the earth retaining wall using the PHC file in FIG. 1,
FIG. 3 is a side view of FIG. 1,
4 is a perspective view showing a modified example of the display of Fig.

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

Prior to the description of the present invention, the following specific structure or functional description is merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms , And should not be construed as limited to the embodiments described herein.

In addition, embodiments according to the concept of the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

FIG. 1 is a perspective view showing a structure of an earth retaining wall using a PHC file according to the present invention, FIG. 2 is an exploded perspective view of an earth retaining wall using a PHC file in FIG. 1, and FIG. Fig. 4 is a perspective view showing a modification of the display of Fig.

As shown in these drawings, in the earth retaining wall using the PHC file according to the present invention, the PHC file 110 is installed in a line along the boundary surface of the earth. At this time, the PHC file 110 is directly installed on the conventional PHC file without any structural change. In other words, a typical PHC file is a type of prefabricated concrete pile. In KS F 4306, it is defined as pretensioned high strength concrete pile (Pretensioned spun high strength concrete pile), and the strength of concrete is higher than 800kg / ㎠.

The present invention can reduce the construction period and construction cost by constructing the earth retaining wall by using the PHC file without changing the structure of the PHC file. And the circular steel pipes 120 are installed one by one between the four pipes.

At this time, the round steel pipe 120 is made of a metal material, and a coated round steel pipe can be used. Also, when a file and a file or a steel pipe are simply brought into contact with each other, space is likely to be generated between the file and the file or between the file and the steel pipe. Therefore, in the case of the permeable layer, the chemical solution is injected therebetween The LW method, the SGR method, and the JSP method can be selectively applied to the chemical solution injection method for preventing the leakage and leakage of the soil.

The brackets 130 are welded to the round steel pipes 120 provided between the three PHC piles 110 and the brackets 130. The brackets 130 are installed in the brackets 130, And a support 150 is installed at a predetermined interval. The support 150 may be installed in the wale 140 at a position where the bracket 130 is installed and the support 150 may be attached to the wale 140 using a fixing member such as a bolt, Respectively.

It is preferable that the wale 140 and the support 150 are H-shaped and the reinforcing member 160 is installed inside the wale 140 where the support 150 is installed.

At this time, it is preferable to install four reinforcing pieces 160 in the upper and lower sides, and a finishing plate 152 is preferably provided at an end of the support 150 which is in contact with the wale band 140. The reinforcing member 160 and the marker plate 152 can reinforce the strength.

Particularly, as shown in FIG. 4, the support 150 may use a round steel pipe. That is, the support 150 may be a circular steel pipe instead of the H beam. In the case of general CIP method, the H beam used as a supporting beam has a size of 300 × 300 × 10 × 15, 94 Kg / m, and two rows are applied at 188 Kg / m. On the contrary, when circular steel pipe (spec. 406) is applied, the material cost can be greatly reduced by 66.8 Kg / m.

The reason why the circular steel pipe can be applied in this way is that the construction of the earth retaining wall made of the PHC pile and the steel pipe is very strong.

The bracket 130 may include a flat plate portion 132 and a support portion 134. The flat plate portion 132 is welded to the outer circumferential surface of the circular steel pipe 120 to support the wrist strap 140 and the support 150. The support portion 134 is connected to the lower portion of the flat plate portion 132 And the end portion is welded to the outer circumferential surface of the circular steel pipe 120 to provide a supporting force.

According to the present invention, since the circular steel pipe 120 is disposed between the PHC file 110 and the PHC file 110 without any structural change, the bracket 130 can be easily positioned at a desired position It is possible to reduce the construction period and construction cost by welding.

Also, the method of constructing the earth retaining wall using the PHC file according to the present invention is characterized in that the ground is punched in a line by using a perforating machine appropriately selected according to the ground characteristics and the perforation length along the boundary surface of the earth to be ground, Inserting the PHC file 110 in a line, and constructing the earth retaining wall using the PHC file.

In order to construct the earth retaining wall without structurally changing the PHC file 110, the present invention is characterized in that the circular steel pipes 120 are disposed one by one between the predetermined number of the PHC files 110 inserted in a row, 120).

Here, it is preferable that the circular steel pipes 120 are installed one by one among three to four PHC files 110.

It is also noted that the round steel pipe 120 can be a coated round steel pipe.

The brackets 130 are welded to the round steel pipes 120 disposed between three or four of the PHC files 110. The brackets 130 are provided with wales 140, And installing the support beams 150 at predetermined intervals on the support walls 140 at a predetermined interval, thereby completing construction of the earth retaining walls according to the present invention.

Here, the wrist strap 140 and the boom 150 are H-shaped steels and have the same effect as a normal wrist strap and a girder. However, in the present invention, the bracket 130 is welded to the round steel pipe 120 for installation of the wrist strap 140 and the support 150, so that it can be easily installed. That is, according to the present invention, the circular steel pipes 120 are disposed one by one between three or four PHC files 110 without changing the structure of the PHC file 110, so that the brackets 130, It is possible to simplify the installation of the heat exchanger 150 and reduce the construction period and the construction cost.

Meanwhile, in the present invention, the earth retaining wall is constructed using the PHC file, so that the support can be used as a circular steel pipe instead of the H beam.

The present invention is characterized in that when the support 150 is installed on the wale 140, the reinforcement 160 is installed inside the wale 140 where the support 150 is positioned, And attaching a finishing plate 152 to the end of the support 150 to be contacted. The reinforcement member 160 and the finishing plate 152 may be installed to provide reinforcement to the joint between the wale 140 and the support 150.

According to the present invention, since the round steel pipe 120 capable of welding the bracket 130 is installed between the PHC files 110, the installation of the bracket 130, the wale 140 and the support 150 is very convenient But also constitutes an earth retaining wall made of the PHC file 110, so that the advantages of the PHC file can be utilized.

For example, in the present invention, a circular steel pipe 120 is installed at a proper number of the PHC files 110 installed in a row, and the bracket 130, the wale 140 and the support 150 are installed in the circular steel pipe 120, So that the construction period and construction cost can be reduced.

Particularly, the present invention has the advantage that it is possible to reduce the wastage of the material and simplify the process since the vertical gap between the supports can be widened more widely than the conventional method. For example, in the case of the general CIP method, the upper and lower spacings between the supports are not more than 3 m. However, if the retaining wall is formed of the PHC file as in the present invention, the vertical spacing between the supports can be increased by 4 to 4.5 m. Can be greatly reduced, and thus one underground floor can be constructed at a time. That is, in the case of the CIP method, it is necessary to install and dismantle the slab several times before forming the slab, but the present invention has an advantage in a single process.

Although the present invention has been fully described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be understood that the present invention is not limited thereto. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

110 - PHC file 120 - Round steel pipe
130 - Bracket 140 - Wale
150 - Zibo 160 - Reinforcements

Claims

In an earth retaining wall using a PHC file,
A PHC file constructed in line with the boundary of the site;
A circular steel pipe constructed to be disposed one by one between 3 and 4 of the PHC file;
A bracket welded to the round steel pipe;
A wrist strap installed on the bracket; And
And a brace provided on a wale at a position where the bracket is spaced from the wale band at a predetermined interval,
The bracket comprises:
A flat plate portion welded to an outer circumferential surface of the circular steel pipe and welded to an outer circumferential surface of the circular steel pipe at one end so as to support the wrist strap and the support, And
And a support portion formed to extend downward from the flat plate portion so as to be inclined and welded to an outer circumferential surface of the circular steel pipe to have a supporting force.

The method according to claim 1,
And a finishing plate is installed at an end portion of the girder which is installed in contact with the wale band, in addition to a reinforcing piece provided inside the band where the girder is installed.

The method according to claim 1,
Wherein the circular steel pipe is a coated round steel pipe.

A method of constructing a retaining wall using a PHC file,
Drilling the ground in a line by using a perforating machine appropriately selected according to the ground characteristics and the perforation length along the interface of the ground to be ground;
Inserting a PHC file in a perforated hole in a row;
Inserting a circular steel pipe so that the circular steel pipes are arranged one by one between a predetermined number of the PHC files inserted in a line;
Welding the bracket to the round steel pipe; And
A step of installing a wale on the bracket, and a step of installing a support on the wale at regular intervals.

5. The method of claim 4,
In the step of installing the support in the wale,
And installing a finishing plate on the end of the girder which is installed in contact with the wale band on the inner side of the band zone where the girder is located.

5. The method of claim 4,
In the step of inserting the circular steel pipe,
Wherein the circular steel pipe is installed one by one between 3 to 4 PHC files.

5. The method of claim 4,
In the step of inserting the circular steel pipe,
Wherein the circular steel pipe is a coated round steel pipe.