KR101783439B1 - Stability apparatus for ground having prestressed stiffener - Google Patents

Abstract

The present invention relates to a ground reinforcing apparatus using a prestressed stiffener which maximizes a restricting force with respect to displacement of the ground; thereby preventing an accident due to falling rocks due to a collapse or sliding of the ground. According to an embodiment of the present invention, the ground reinforcing apparatus using the prestressed stiffener comprises: a stiffener, a traction part, an expansion part, and a fixated part. The stiffener has a first screw thread formed on an outer circumference of a front end thereof and has a second screw thread formed on the outer circumference of a rear end thereof. The traction part has a coupling member having a third screw thread formed on an inner circumference of a front side thereof to be coupled to the second screw thread through a screw; has a sawtooth type-multistage expansion guide member formed on a rear side thereof having a conical shape; and has a fourth screw thread formed on the outer circumference between the coupling member and the sawtooth type-multistage expansion guide member. The expansion part is positioned outside the sawtooth type-multistage expansion guide member, and has a multi-expansion sawtooth groove formed on the inner circumference thereof in such a manner to be expanded in a multi-stage as approaching from the front side to the rear side and in contact with the sawtooth type-multistage expansion guide member, and has a plurality of grip protrusions formed on the outer circumference thereof to protrude in a direction of the fourth screw thread and inserted and fixated to an insertion hole. The fixed part has a fifth screw thread formed on the inner circumference thereof to selectively be coupled to the fourth screw thread through a screw in a state where the traction part penetrates the inside thereof to be positioned, and is connected by the sawtooth type-multistage expansion guide member and a connector.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a ground reinforcement for a prestress reinforcement,

The disclosed contents relate to a ground reinforcement apparatus using a prestressed stiffener used for reinforcement work for preventing the collapse of the ground and preventing the fall of the ground and forming the inner section of the tunnel excavation surface.

Unless otherwise indicated herein, the contents set forth in this section are not prior art to the claims of this application and are not to be construed as prior art to be included in this section.

Generally, the vertical or inclined ground that is generated when excavating, cutting, or embanking the ground in the construction site such as construction or civil engineering is unstable, and there is a risk of collapse or fallout. Therefore, even if the ground is stable, ground reinforcement works will be implemented to prevent accidents caused by unexpected causes.

Reinforcing works to prevent the collapse or fall of the ground are largely reinforced by earth anchor method, soil-nailing method and rockbolt method. It can be divided.

The earth anchor method is also called tie-back method, which is a method of drilling a hole in the earth retaining wall, inserting a reinforcing steel or a PC steel wire, grouting the mortar, and anchoring the back wall to hold the earth retaining wall.

In addition, the soil nailing method is a method of reinforcing the ground by inserting stiffener into the soil and inserting the stiffener into the ground at a narrow interval without prestressing to increase the overall strength of the ground itself. It is a method to reinforce the ground in the same way as the nailing method.

The earth anchor method, the soil nailing method, and the rock bolt method have an effect of preventing the collapse of the ground or the occurrence of rockfall by suppressing the displacement of the ground which may occur during construction or after completion of the construction.

However, in the conventional ground reinforcement method, since the reinforcing material inserted into the ground is formed into a rod shape such as a steel bar, a steel wire, and a steel bar, even if the mortar is subjected to grouting in the hole formed in the ground, And there is a disadvantage that the restraining force against the displacement of the ground can not be maintained according to the state or time elapse.

1. Korean Patent Publication No. 10-2006-0100790 (2006.09.21) 2. Korean Patent Publication No. 10-2014-0124198 (Apr. 24, 2014) 3. Korean Patent Publication No. 10-2001-0086663 (September 15, 2001)

The present invention is to provide a ground reinforcement apparatus using a prestressing reinforcement which is capable of being extended when the stiffener is inserted into the insertion hole to maximize the clamping force and fixed to the ground in a state where the stiffener is pulled so as to be prestressed.

In the disclosed embodiment, the rear side is inserted into the insertion hole formed on the ground and the front side is exposed to the outside of the insertion hole, and the first thread is formed on the outer periphery of the shearing and the second thread is formed on the outer periphery of the rear end And a third screw thread formed on the inner circumference of the first screw thread so as to be screwed with the second screw thread so that the rear end of the stiffener can be inserted and screwed in front of the insert hole in a state of being coupled to the rear end side of the stiffener. Wherein a plurality of serration-type multi-stage extension guide members are formed in a conical shape extending from the front to the rear in a multi-step manner, and a fourth thread is formed on an outer periphery between the coupling member and the multi- And an outer periphery of the sawtooth multi-stage expansion induction member, And a plurality of grip protrusions protruding in the fourth thread direction are formed on the outer circumference of the plurality of grip protrusions so that when the stiffener is pulled toward the front side, An enlarged portion in which the gripping protrusion is inserted and fixed in the insertion hole while being extended in a multi-stage as the multi-stage expanding guide member is moved forward; and an enlarged portion in which the gripping portion is inserted into the insertion hole, And a fifth screw thread is formed on the inner periphery thereof so as to be able to be engaged with the threaded multi-stage extension guide member, and the fixing portion connected by the connector is connected to the toothed multi-stage extension guide member.

According to the ground reinforcing apparatus using the prestress reinforcement as described above, the reinforcing member can be firmly supported in the insertion hole by the radially expanding portion provided at the end of the reinforcing member inserted into the insertion hole, The stiffener pulled to the front side in the state where the rear end is supported by the part becomes a prestressed state and the stiffener is fixed to the ground in this state to maximize the restraining force against the displacement of the ground to prevent the falling rock caused by the collapse or sliding of the ground It has an excellent advantage.

1 is a perspective view of a ground reinforcement apparatus using a prestressing reinforcement according to an embodiment of the disclosure;
2 is an operational cross-sectional view of a ground reinforcement apparatus using a prestressing stiffener according to an embodiment of the disclosure.
FIG. 3 is a use state view of a ground reinforcement apparatus using a prestressing reinforcement according to an embodiment of the disclosure; FIG.

Brief Description of the Drawings The advantages and features of the disclosed subject matter, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It is to be understood, however, that the disclosure is not limited to the embodiments set forth herein, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, But is provided only to fully disclose the scope of the disclosure to those with ordinary skill in the art, and the disclosure is only defined by the scope of the claims. Like numbers refer to like elements throughout.

The detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present disclosure. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Therefore, the definition should be based on the contents of this specification.

Figures 1 to 3 illustrate one embodiment according to the teachings of the present invention. Fig. 1 is a perspective view, Fig. 2 is an operational view, and Fig. 3 is a state of use.

Hereinafter, the constituent members of the ground reinforcing apparatus 1 using the prestressing reinforcement according to an embodiment of the present invention with reference to FIGS. 1 and 2 will be described in detail.

First, referring to FIG. 1, the stiffener 100 is formed into a linear rod shape, and when the steel wire is used, it is formed of a separate coupling device. Both ends of the ground are connected and fixed in a block that is built up in the ground and in the ground so as to prevent accidents such as the collapse of the ground and the occurrence of rockfall.

The stiffener 100 is inserted into the insertion hole 800 where the rear side thereof is excavated on the ground, and the front side is exposed to the outside of the insertion hole 800. At this time, a first thread 110 is formed on the outer periphery of the front end, and a second thread 120 is formed on the outer periphery of the rear end.

The above-described reinforcing member 100 is installed in a prestressed state by being fixed within the insertion hole 800 while its rear side is fixed by the liner screw unit 500 to be described later. The reinforcing member 100 may be manufactured to have various thicknesses and lengths in consideration of the overall condition of the ground. In addition to the reinforcing member 100, a steel wire or a steel bar may be used.

The traction unit 200 is coupled to the rear end of the stiffener 100. The traction unit 200 extends the expansion unit 300 to be described later depending on whether the stiffener 100 is pulled or not . The enlarged portion 300 is positioned in the insertion hole 800 in a state of being coupled to the stiffener 100 and a second thread 120 is provided on the inner circumference of the enlarged portion 300 so that the rear end of the stiffener 100 can be inserted and screwed. And a coupling member 210 having a third thread 211 threadedly engaged with the coupling member 210. In the rear, a sawtooth multi-stage extension guide member 220 is formed in a conical shape extending from the front to the rear in a multistage manner. In addition, a fourth thread 230 is formed on the outer circumference between the coupling member 210 and the sawtooth multi-stage extension guide member 220.

At this time, the second thread 120 and the third thread 211 are coupled to each other in the right direction because the fourth thread 230 and the fifth thread 410 to be described later are screwed to the left. That is, the stiffener 100 and the fixing part 400 are pulled while being rotated in the direction in which the threaded connection between the fourth thread 230 and the fifth thread 410 is released. At this time, the second thread 120 and the third thread So that the threaded engagement of the threaded portion 211 is prevented from being released together. The sawtooth multi-stage extension guide member 220 is advanced in the extension portion 300 when the stiffener 100 is pulled, and extends the extension portion 300. For this purpose, the other edge has a ground plane that extends into multiple stages. The fourth screw thread 230 serves to fix the fixing part 400 when the stiffener 100 is inserted.

Next, referring to FIG. 2, the extended portion 300 is positioned outside the sawtooth multi-stage extension guide member 220 described above. The extension portion 300 is radially expanded when the toothed multi-stage extension guide member 220 is advanced, and is fixed inside the insertion hole 800, so that the rear of the stiffener 100 is firmly fixed in the insertion hole 800 . The extension portion 300 is formed at the inner periphery of the extension portion 300 so that the multi-stage extended toothed grooves 310 are extended in a multi-step manner from the front to the back. And a plurality of grip protrusions 320 protruding in the direction of the fourth screw thread 230 are formed on the outer periphery thereof. Accordingly, when the stiffener 100 is pulled forward, the grip protrusion 320 is inserted and fixed in the insertion hole 800 while being extended in multiple stages as the sawtooth multi-stage extension guide member 220 is moved forward. At this time, the grip protrusion 320 is partly fixed to the inside of the insertion hole 800 and is also supported at a portion where the grouting (900) is applied in the insertion hole 800.

The extended portion 300 is formed to have a longer length than the sawtooth multi-stage extension guide member 220. This is because it is necessary to secure a space in which the sawtooth multi-stage extension guide member 220 is sufficiently moved forward from the rear of the extension portion 300 when the stiffener 100 is pulled. Accordingly, in a state where the fixing portion 400 is screwed to the fourth thread 230, the sawtooth multi-stage extension guide member 220 is positioned on the inner rear side of the expansion portion 300, and as the stiffener 100 is pulled, Shaped multi-stage extension guide member 220 is gradually moved forward within the extended portion 300 so that the extended portion 300 is radially expanded. At this time, the enlargement 300 is formed in the lengthwise direction of the stiffener 100 so as to radially expand the stiffener 100 by three times when the stiffener 100 is pulled.

The fixing portion 400 is selectively screwed to the fourth thread 230 described above. The fixing part 400 serves to prevent the extension part 300 from being detached from the sawtooth multi-stage extension guide member 220 when the reinforcing member 100 is inserted. To this end, the fixing portion 400 and the serrated multi-stage extension guide 220 are connected by a connector 420, and a fifth thread 410 is screwed to the fourth thread 230 on the inner circumference. At this time, both ends of the connector 420 are hingedly connected to the toothed multi-stage extension guide member 220 and the fixing portion 400 so that the connector 420 can be rotated when the extension portion 300 is extended.

When the reinforcing member 100 is inserted into the insertion hole 800, the fifth screw thread 410 is inserted into the insertion hole 800 so that the extension portion 300 can be positively positioned on the toothed multi- 4 thread 230 with a screw thread. When the stiffener 100 is pulled in the insertion hole 800, the threaded engagement of the fourth thread 230 and the fifth thread 410 is released in the direction of releasing the insertion hole 800 It is pulled outwardly. When the reinforcing member 100 is used as a steel wire, it is assembled by screwing it into a ground reinforcement apparatus by using a separate coupling hole.

Hereinafter, the overall construction method of the ground reinforcement apparatus 1 using the prestress reinforcement according to an embodiment of the present invention with reference to FIG. 3 will be described in detail.

First, a plurality of insertion holes 800 are drilled in the ground, and the rear side of the reinforcing member 100 is inserted into the insertion holes 800. A trailing portion 200 is coupled to the rear end of the stiffener 100. The fixing portion 400 is screwed to the fourth thread 230 of the traction portion 200 and the sawtooth multi- An extension 300 is positioned on the extension guide member 220, respectively.

When the stiffener 100 is inserted, the inside of the insertion hole 800 is grouted 900 by mortar. The curing of the portion where the grouting 900 is applied is started and the reinforcing member 100 is rotated in the right direction before the hardening is completed. At this time, the fourth screw thread 230 and the fifth screw thread 410 ) Are gradually separated.

At the same time, the extended portion 300 is radially expanded while the serrated multi-stage extension guide member 220 is pulled forward from the rear of the extended portion 300. In addition, the holding protrusion 320 formed outside the extending portion 300 is firmly fixed to the inside of the insertion hole 800

When the threaded connection between the fifth thread 410 of the fixing part 400 and the fourth thread 230 of the pulling part 200 is completely released, the stiffener 100 is pulled in a state in which it is not rotated or rotated. (300) is no longer extended.

The traction finished stiffener 100 is fixed to the ground side by the liner screw unit 500 in a pulled state and installed in a prestressed state. Here, the liner screw unit 500 includes a pressure plate 510 placed in an interfacial position where the insertion hole 800 is formed in a state where the reinforcing member 100 passes through the center thereof, and a state in which the reinforcing member 100 passes through the center thereof And a fixing nut 530 screwed to the outer periphery of the liner screw 520 to fix the stiffener 100 in a prestressed state.

The liner screw unit 500 is the same as the liner screw according to the prior art, and the detailed description will be omitted for simplification of the description.

When the grouting portion 900 is completely cured, the front side of the reinforcing member 100 is positioned in a block 700 that is stacked on the ground. A cap member 600 secured to the front surface of the block 700 is screwed to the first thread 110 of the front end of the stiffener 100 protruding from the block 700.

The ground reinforcing apparatus 1 using the prestress reinforcement as described above is provided with an extension 300 extending radially depending on whether the reinforcing member 100 is inserted into the insertion hole 800 or not, Can be firmly supported in the insertion hole 800 and the stiffener 100 pulled to the front side in the state where the rear end thereof is supported by the extended portion 300 is in a prestressed state and in this state, The restraining force against the displacement of the ground is maximized, and the rockfall accident due to the collapse or sliding of the ground can be prevented.

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 invention as defined by the appended claims. But is not limited to the example.

1: Ground reinforcement system using prestress reinforcement
100: Stiffener
110: First thread
120: Second thread
200:
210:
211: Third thread
220: serrated multi-stage extension guide member
230: fourth thread
300: Extension part
310: Multistage extended sawtooth groove
320:
400:
410: fifth thread
420: Connector
500: liner screw unit
510:
520: liner screw
530: Fixing nut
600: cap member
700: Block
800: Insertion hole
900: Grouting

Claims (9)

A reinforcing member having a rear side inserted into the insertion hole formed by excavating on the ground, a front side exposed to the outside of the insertion hole, a first thread on the outer periphery of the sheath and a second thread on the outer periphery of the rear end;
A coupling member having a third screw thread formed on the inner circumference thereof so as to be screwed with the second screw thread so that the rear end of the stiffener can be inserted and screwed in front of the insertion hole while being coupled to the rear end side of the stiffener Wherein a plurality of serration-type multi-stage extension guide members are formed in the rear portion of the guide member in a conical shape extending from the front to the rear in a multi-step manner, ;
And a plurality of multi-step enlarged tooth grooves formed on the outer circumference of the toothed multi-step expanding guide member to be inserted into the plurality of multi-step expanding guide members, the multi-step extended toothed grooves being extended in a plurality of steps from the front to the back, A plurality of grip protrusions protruding from the plurality of grip protrusions are formed, and when the stiffener is pulled forward, the grip protrusion is inserted and fixed in the insertion hole while being extended in multiple stages as the toothed multi-stage extension guide member is moved forward; And
A fixing portion having a fifth thread formed on an inner periphery thereof so as to be selectively threadedly engaged with the fourth thread in a state where the pulling portion is penetrated into the fixing portion, the fixing portion being connected to the serration multi- / RTI >
Wherein the front side of the reinforcing member is inserted through one block which is laminated on the ground, and the first thread protruding out of the block is provided with a reinforcing member using a prestress reinforcement which is screwed to a cap member, .
The method according to claim 1,
Wherein the extension is formed in the longitudinal direction of the reinforcing member so as to be radially expanded when the reinforcing member is pulled in three times.
The method of claim 2,
Wherein both ends of the connector are hingedly connected to the toothed multi-stage extension guide member and the fixing unit, respectively, so that the connector can be pivoted when the extension unit is extended.
The method according to claim 1,
Wherein the fixing portion is in a state in which the fifth thread is screwed with the fourth thread so that when the stiffener is inserted into the insertion hole, the extension is not arbitrarily expanded but can be positively positioned on the toothed multi- Wherein the prestressing reinforcement is inserted into the ground reinforcement.
The method of claim 4,
Wherein the stiffener is pulled outwardly of an insertion hole formed in the ground while being rotated in a direction in which the threaded engagement of the fourth thread and the fifth thread is released.
The method of claim 5,
Wherein the first thread and the third thread are screwed in the right direction and the fourth thread and the fifth thread are threaded in the left direction.
The method of claim 6,
Wherein the reinforcing member is fixed to the ground side by the liner screw unit in a pulled state and installed in a prestressed state.
The liner screw unit according to claim 7,
A screed plate placed in an interfacial state on a ground where the insertion hole is formed in a state where the reinforcing member passes through the center thereof;
A liner screw placed on the support plate in a state where the reinforcement member penetrates the center thereof; And
And a fixing nut screwed to the outer periphery of the liner screw to fix the stiffener in a prestressed state.
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