KR101758196B1

KR101758196B1 - Pressure grouting steel with deformed steel pipe

Info

Publication number: KR101758196B1
Application number: KR1020150150907A
Authority: KR
Inventors: 김학진; 강영호
Original assignee: (주)학영엔지니어링
Priority date: 2015-10-29
Filing date: 2015-10-29
Publication date: 2017-07-26
Also published as: KR20170049955A

Abstract

The present invention is characterized in that a hole having an equal spacing is formed on the outer surface as a whole, and a plurality of protrusions which can be protruded outward by a double packer entering in a pressing grouting process are formed in the hole, The present invention relates to a pressurized grouting pile having a plurality of fixation ring members connected and fixed so that a shear frictional force and a tip supporting force can be greatly increased. The pressurized grouting pile is provided on an outer surface of a deformed steel pipe having through- A plurality of protrusions which can be protruded outward by a double packer that enters the pressurized grouting when pressurized grouting is formed, and a plurality of tip fixing ropes having diameters different from each other are formed outside the tip, .

Description

Description of the Related Art [0002] Pressure grouting steel with deformed steel pipe

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized grouting pile using a deformed steel pipe which can be used for a basic coarse body such as piles of various types and types used for the purpose of preventing settlement of a foundation structure, A plurality of protrusions which can be protruded outward by the double packer entering in the pressing grouting process are formed in the hole and a plurality of tip fixing ring bodies having different diameters are connected and fixed to the outside of the tip, The present invention relates to a pressurized grouting pile using a deformed steel pipe capable of greatly increasing a shear frictional force and a tip supporting force.

(Hereinafter referred to as a basic solid body) such as various types and forms of basic solid body used for the purpose of preventing settlement of a foundation structure at a construction site are usually put into the ground through a hoeing process, Through the perforations formed through the back,

In this way, the foundation rigid body engaged in the ground can exhibit the end support force by the transmitted compressive force and the shear frictional force by the pulling force, thereby stably maintaining the initial installation state.

For reference, the tip end support force is proportional to the tip end area of the base superficial body, and the shear frictional force is proportional to the circumference and length.

Here, it is very important to ensure that the tip end bearing force of the basically rigid body can effectively cope with the compressive force and bending moment transferred during the actual use.

For this purpose, it is necessary to construct a large foundation pipe with a diameter of 400mm or more and to make a long construction so that the construction can be completed until the hard rock layer is located. However, the intended support capacity and shear friction can be secured The construction is possible.

Therefore, there has been a problem that air supply and air in the construction process are greatly increased and delayed, and serious construction noise is generated for a long time.

On the other hand, the basic solid body having a diameter of about 35 mm to 65 mm, which is used in the conventional micro pile method, ensures the tip end supporting force and the shear frictional force by the frictional resistance by the grouting injected into the perforated ground and the periphery rather than the end supporting force, .

Therefore, in order to secure sufficient end bearing capacity and shear frictional force of such a basic close-up body, it is necessary to install a large number of pieces, so that also auger and air are greatly increased and delayed, There is a problem that the application is limited.

On the other hand, in case of basic reinforcement for a building or structure that is under construction, it is reinforced with a small diameter file At this time, micro files are used.

The micro-file is a small-sized equipment and usually has a diameter of 150 to 200 mm. It can perform perforation work in all strata as well as vertical or inclined construction.

These microfiles are installed through the process of drilling the free length and the settlement area with a certain diameter and length, installing the steel rods in the perforation holes, filling the cement grout material with the soil layer and bedrock layer and integrating the microfiles with the ground.

6 is a cross-sectional view of a microfilm according to the prior art. The microfibre includes a casing 1 that is inserted into a punched hole in the ground, a pile body 2 that is inserted into the casing 1, And a grouting layer (3) formed by a grout material filled in the casing (1).

On the other hand, the supporting force of the micropile is determined by the frictional force generated between the tip end supporting force of the distal end contacting the ground and the inner surface of the ground and the outer surface of the micropile.

However, since the micro pile is formed in a cylindrical shape having a very narrow cross-sectional area at the tip end, the tip end holding force of the tip end portion is not so large.

That is, when a compressive load due to a building or a structure is applied to a microfile, a load is concentrated on the leading edge, and microfiles can dig into the ground to cause settlement.

On the contrary, when the tensile load is applied to the microfiles in the upward direction, the frictional force between the outer peripheral surface of the flat microfiles and the inner wall of the ground is weak, so that the microfiles may float upward or may be pulled out.

That is, the micro-pile method uses only the frictional force between the pile body and the grouting material and the frictional force between the grouting material and the bedrock. In order to increase the frictional force between the pile body and the bedrock, Therefore, there is a problem that it takes a lot of time and cost to increase the frictional force.

Recently, techniques for solving such a problem have been proposed. For example, the description will be made as follows.

First, in Korean Patent Application No. 10-2013-0033077, as shown in Fig. 7,

A pile body (10) fixed by inserting and grouting in a pile formed in the ground;

A fixing blade (11) formed at a periphery of the pile body (10) at a cross sectional area larger than that of the pile body;

And an end reinforcing means (20) connected to a distal end of the pile body,

At least two of the front end reinforcing blocks each having a ring shape having a larger cross-sectional area than the pile body, the pile passing through the center hole and each being fixed to the pile with a predetermined height, And a plurality of end reinforcement rods which are vertically arranged between the front end reinforcement blocks and are fixed to the front end reinforcement blocks, respectively, are arranged in a circumferential direction at regular intervals, Wherein the end reinforcing rod is provided with a diameter increasing portion for increasing the fixing force of the pile body by projecting from the periphery of the front end reinforcing block by bending. Has been proposed.

In Korean Patent Application No. 10-2014-0088903, as shown in Fig. 8,

A steel bar 11;

A lock nut 20 formed of a plate having a plate shape larger in cross section than the steel bar and coupled to a head of the steel bar, and a nut fastened to the steel bar assembly and fixing the plate;

And a leading end fixing hole which is assembled to the leading end of the steel bar and is installed in a cooperative hole of the pile hole 1 in the ground and is fixed to the pile of the pile hole by an expanding wedge,

The leading end fixing member is configured such that a cone mounting portion 32 having an inclined cone supporting surface 33 is formed at the periphery thereof and an extension guiding slant portion 31 is formed at the periphery thereof, An inner bottom body (30) which is supported so as to be able to advance toward the co-work of the pile hole and fixed to the steel bar when buoyancy is generated,

A pressure plate 40 fixed to the periphery of the steel bar,

A lower end of the inner lower body is lowered on the extension induction slope part of the inner lower body by the presser plate in a state in which the leading end of the inner lower body is fixed to the joint of the pile hole while being arranged along the circumferential direction of the inner lower body, Two or more expanding wedges (50) extended to the periphery of the inner lower body and fixed to the ground around the pile hole and expanded by the floating of the inner lower body when buoyancy is generated,

And an inner bottom body binding means for joining the steel bar and the inner bottom body when the lifting force is applied to the steel rod by the buoyancy force to expand the expanding wedge by the rise of the inner bottom body,

Wherein the inner lower body binding means comprises a wedge cone (60) inserted into the cone mounting portion of the inner bottom body at the distal end portion of the steel bar and having a peripheral portion supported by the cone supporting surface, and a wedge cone And a support member for supporting the support member,

The support member includes a coil spring inserted into the wedge cone of the spring fixture (63) fixed to the steel rod and supporting the spool fixture on the supporting surface of the wedge cone 62), which is a micro pile for soil reinforcement and buoyancy prevention.

All of the above-described conventional techniques can increase the end support force and the shear frictional force so that the foundation of the structure can be firmly reinforced.

(1) Korean Patent Application No. 10-2013-0033077) (2) Korean Patent Application No. 10-2014-0088903)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems as described above, and an object of the present invention is to provide an apparatus and a method for manufacturing a double- Wherein a plurality of ring bodies having different diameters are connected and fixed to the outer side of the tip end, and consequently, the shear frictional force and the tip end supporting force can be greatly increased, thereby providing a pressurized grouting pile using the deformed steel pipe.

According to an aspect of the present invention,

(1) A plurality of holes are formed on the outer surface of an unshaped steel pipe formed with through holes penetrating up and down, and a plurality of protrusions which can be protruded outward by the double packer entering the pressurized grouting are formed in the holes And a plurality of leading end fixing rings having different diameters are connected and fixed to the outside of the leading end.

(2) In the above-mentioned (1), a protruding protrusion is formed on an outer surface of a hole into which the protrusion is inserted, and an elastic protrusion, which is operated by elastic restoring force of a spring, And an outer surface of the pawl body located in the hole formed with the hole is formed with a latching groove which is engaged with the elastic protrusion and can be prevented from being separated from the inner surface and the inclined surface is formed on the inner and outer sides in the same direction .

(3) In the above-mentioned (1), the front end fixing ring body is formed so as to have a horizontal portion and an inclined portion, wherein a fitting hole capable of being fitted to the deformed steel pipe is formed at the center, And a plurality of connection holes having through-holes formed therein are formed.

As described above, the present invention is characterized in that a hole having an equal spacing on the outer surface is formed as a whole, and a plurality of protrusions which can be protruded outward by the double packer entering in the pressing grouting process are formed in the hole, The present invention provides a pressurized grouting pile using a deformed steel pipe which can greatly increase the strength of the grout.

Another object of the present invention is to provide a pressurized grouting pile using a deformed steel pipe which has a plurality of ring members connected to and fixed to the outer side of the distal end thereof.

1 is a perspective view showing a pressurized grouting pile using a deformed steel pipe according to the present invention,
FIG. 2 is an enlarged cross-sectional view showing a main part of a pressurized grouting pile using a deformed steel pipe according to the present invention,
3 is a front view showing a pressurized grouting pile using a deformed steel pipe according to the present invention, Fig.
4 is a side sectional view showing a pressurized grouting pile using a deformed steel pipe according to the present invention,
FIG. 5 is a sectional view showing a construction state of a pressurized grouting pile using a deformed steel pipe according to the present invention, FIG.
6 is a cross-sectional view showing a construction state of a conventional microfiber,
FIG. 7 is a cross-sectional view showing the construction of a conventional microfiber having a reinforced tip force,
8 is a cross-sectional view showing a conventional microfiber for soil reinforcement and buoyancy prevention.

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

In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 to 4, the present invention is characterized in that a hole 102 having an equal spacing is formed on the outer surface of an unshaped steel pipe 100 in which a through hole 101 penetrating up and down is formed, A plurality of pawl bodies 110 that can be protruded outward by the double packer 10 that enters during pressurized grouting are formed and a plurality of leading end fixing ring bodies 120 having different diameters are connected and fixed to the outside of the tip ends .

A protruding protrusion 104 is formed on the outer surface of the hole 102 into which the protruding body 110 is inserted and a spring 102 is formed on a peripheral edge of the protruding protrusion 104, The elastic protrusions 108 are formed on the outer surface of the pawl body 110 located in the elongated hole 102. The elastic protrusions 108 are engaged with the elastic protrusions 108, And the inclined surfaces 114 are formed on the inside and the outside of the engaging groove 112 in the same direction.

The front end fixing ring body 120 is formed so as to have a horizontal part 122 and an inclined part 124. The fitting part 126 is formed at the center of the end fixing ring body 120 so as to be fitted into the modified steel pipe 100, The horizontal portion 122 is formed with a number of connection holes 129 through which the spacing rods 128 can be connected.

The operation of the present invention having such a configuration will now be described with reference to the drawings.

The present invention can be implemented by inserting the deformed steel pipe 100 in a ground which is drilled with equipment such as an auger boring machine (not shown) as shown in FIG.

Then, the double packer 10 may be moved from the upper portion of the through hole 101 of the inserted diagonal steel pipe 100 to the lower portion.

At this time, the double packer 10 pushes the pawl body 110 protruded from the peripheral edge of the through-hole 101 of the deformed steel pipe 100 to protrude outward.

The pawl body 110 protruded outwardly by being pushed by the double packer 10 is hooked and fixed by the elastic protrusion 108 located on the peripheral edge of the protruding protrusion 104, State.

Then, the double packer 10 which has reached the lower portion of the through hole 101 is pressurized to grout and slowly moved upward.

Then, the grouting material injected by the pressurized grouting operation tightly fills the inside of the through hole 101 of the deformed steel pipe 100 and the inside of the ground drilled through the hole 102.

As a result, the deformed steel pipe 100 is greatly increased in the adhering force with the grouting material injected by the pawl body 110, and the shear frictional force is greatly increased. Therefore, not only the allowable load is increased but also the robustness is greatly maximized, .

In addition, the tip end fixing ring body 120 having a plurality of diameters connected and fixed to the outer side of the distal end of the deformed steel pipe 100 increases the adhering force with the grouting material to be injected, which greatly increases the leading end frictional force, Not only the rigidity is greatly maximized but also the pulling force is improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, 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.

Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

10: Double Packer
100: deformed steel pipe 101: through hole
102: hole 104: protruding jaw
106: spring 108: elastic projection
110: rocker body 112:
114: slope
120: leading end fixing ring body 122:
124: inclined portion 126:
128: gap holding rod 129: connecting hole

Claims

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A pressurized grouting pile using a steel pipe in which a steel pipe having a hole on its outer surface is formed and a protruding member protruding outward through the hole is formed in the pressing grouting and a front end fixing ring having a reinforcing member on the outer side of the front end is formed,
Wherein the steel pipe is an all-steel pipe having vertically penetrating through holes formed therein, the holes having an equal spacing on the outer surface thereof as a whole;
The protruding body is protruded outwardly by the double packer which enters into the hole during the pressure grouting. A protruding protrusion is formed on the outer surface of the hole into which the protruding body is inserted, Wherein an elastic protrusion which is operated by the resilient restoring force of the spring is formed and the outer surface of the pawl body located in the hole formed with the hole is formed with a latching groove which can be prevented by the elastic protrusion from being released, An outer side is formed with an inclined surface in the same direction;
Wherein a plurality of leading end fixing rings having different diameters are connected and fixed to the outside of the tip of the deformed steel pipe.

3. The method of claim 2,
The front end fixing ring body is formed so as to have a horizontal portion and an inclined portion, and a fitting hole is formed at the center of the fixing ring so as to be fittable to the deformed steel pipe, and a plurality of connecting holes are formed through the horizontal portion. Pressurized grouting file using deformed steel pipe.