KR101757270B1 - Ground anchor construction method for anchoring area extended improvement using extended excavation agitator - Google Patents

Abstract

The present invention relates to a method and apparatus for forming a soilless cement bulb body by first expanding excavation and grouting material in a settlement section and forming a deep bulb body in the second bulb cement bulb body to allow the cement bulb body and the deep bulb body The present invention provides an improved ground anchor construction method using an enlarged excavation stirrer to increase the tension of the anchor due to the increase of the adhesive force, thereby reducing the construction water quantity of the anchor, and shortening the air shortening and construction cost. The anchorage enlargement type improved ground anchor construction method using an enlarged excavation stirring apparatus according to a preferred embodiment of the present invention is a method in which an outcasing is introduced to a free ground section and a piercing operation is performed through the inside of the outcasing ; An enlarged excavation stirrer is attached to the front end of the inner casing and inserted into the inside of the out casing. Then, the grout liquid is injected from the front end of the enlarging excavation stirring device through the inner passage of the inner casing, ; ≪ / RTI > Removing the inner casing from the outer casing together with the enlarged excavating and stirring apparatus, and then inserting the outer casing further to the tip of the enlarged excavation settlement section when the excavation and agitation of the settlement section are completed; Inserting the grouting injection hose up to the tip of the outcasing and injecting the grouting solution with the grouting injection hose until the inside of the outcasing is filled; And a step of inserting the anchor steel hull into the inside of the outcasing and removing the outcasing from the soil foundation.

Description

Technical Field [0001] The present invention relates to a ground anchor construction method and an extended anchor construction method using an enlarged excavation apparatus,

The present invention relates to a method of constructing an improved anchor for an anchorage field using an enlarged excavation apparatus, and more particularly, to an anchor construction method for an anchorage anchorage with an improved anchorage system, The depth of the anchor is increased by increasing the tensile strength of the anchor by increasing the allowable adhesive force of the soil cement bulb and the deep bulb body by forming the deep bulb body inside the bulb, The present invention relates to a method of constructing an improved anchor for an anchorage using an agitator.

In general, when a ground anchor is to be settled on the soil (especially the soft soil with an N value of 15 or less), the target fixation force (bearing capacity of the anchor) is constant And the shear stress of the ground is limited due to the characteristics of the slope soils. Therefore, there is a limit to the settlement force which can be settled per one anchor.

Therefore, the number of anchors to be installed also increases, resulting in an increase in the construction cost and construction period, as well as a decrease in construction quality due to the influence of the anchorpost overlapping between the anchors and the anchor holes in the perforated (flush) The horizontal spacing of the ball), the perforation of the perforation, and the settlement of the backside ground due to the clay process of the excavation slime.

Korean Patent No. 10-0673579 (ground anchor reinforced with geosynthetic fibers and anchor construction method using the same) has been proposed as a background of the present invention. This is accomplished by inserting a plurality of ground anchors, which are jackets of geosynthetic fiber fabricated in the shape of a turret, which surrounds the inner lower body connected to one side of the PC steel wire bundle, with the ground anchors surrounding the lower inner body at regular intervals, The fixing force for fixing and fixing the PC steel wire bundle by tensing can be improved.

However, the above background art has a limit in increasing the pulling resistance of the anchor steel hull because it can not have a cross-sectional structure formed from the center of the section in the anchoring steel section, the deep-section bulb body, and the soilless cement bulb body.

Korean Patent No. 10-0673579 (Ground Anchor Reinforced with Geosynthetic Fiber and Anchor Construction Method Using the Same)

The present invention relates to a method and apparatus for forming a soilless cement bulb body by first expanding excavation and grouting material in a settlement section and forming a deep bulb body in the second bulb cement bulb body to allow the cement bulb body and the deep bulb body And an object of the present invention is to provide an improved ground anchor construction method using an enlarged excavation stirring device which can reduce the construction amount of the anchor by reducing the anchor tension by increasing the adhesive force and reducing the air shortening and construction cost .

According to a preferred embodiment of the present invention, an anchorage enlargement improvement type ground anchor construction method using an enlarged excavation stirring apparatus,

The method comprising the steps of: introducing an outcasing to a free ground section on the ground and simultaneously performing a perforation operation through the inside of the outcasing;

An enlarged excavation stirrer is attached to the front end of the inner casing and inserted into the inside of the out casing. Then, the grout liquid is injected from the front end of the enlarging excavation stirring device through the inner passage of the inner casing, ; ≪ / RTI >

Removing the inner casing from the outer casing together with the enlarged excavating and stirring apparatus, and then inserting the outer casing further to the tip of the enlarged excavation settlement section when the excavation and agitation of the settlement section are completed;

Inserting the grouting injection hose up to the tip of the outcasing and injecting the grouting solution with the grouting injection hose until the inside of the outcasing is filled;

And a step of inserting the anchor steel hull into the inside of the outcasing and removing the outcasing from the soil foundation.

According to another preferred embodiment of the present invention, an anchorage enlargement improvement type ground anchor construction method using an enlarged excavation stirring apparatus,

A step of introducing an outcasing to a free ground section on a soil layer and performing a drilling operation through the inside of the outcasing;

An enlarged excavation stirrer was installed at the tip of the inner casing and inserted into the inside of the out casing. Then, the grout was sprayed from the tip of the enlarged excavation stirrer through the inner passage of the inner casing, and at the same time, The method comprising:

When the excavation and the agitation of the settlement section are completed, the outcasing is inserted up to the tip of the enlarged excavation section, the enlarging excavation stirring device is positioned inside the outcasing, and then the inner casing is taken out Filling the grout liquid into the outer casing while injecting the grout liquid through the inner casing inner passageway while drawing out from the casing;

And a step of inserting the anchor steel hull into the outer casing filled with the grout liquid and then removing the out casing from the gravel soil.

Further, in the above-mentioned enlarged excavation stirring apparatus,

An outboard body having a predetermined length in a rectangular cross section and having a gear accommodating chamber formed in a certain section of the inside thereof and a key groove formed in an inner circumferential surface of a rear end portion and being freely inserted into the out casing;

An inbody which is inserted into the outbody in a concentric manner and has a grouting jet opening communicated with an inner passage at a tip side thereof and a key coupled to the key groove at a rear end to rotate integrally with the outbody;

Left and right wing gears rotatably supported on both sides of the outboard body and positioned in the gear housing compartment;

Upper and lower rack gears disposed above and below the gear accommodating chamber and engaged with the wing gear;

Right and left stirring wings connected to the gear shafts of the left and right wing gears and positioned outside the out body;

A spring compression plate fixed to the inboard side and positioned in the gear accommodating chamber; And

A pair of rack gears, one end of which is supported by the spring compression plate and the other end of which is supported by the pair of rack gears to move the rack gear with a compression repulsive force when the key is engaged with the key groove, And a compression spring.

In another embodiment,

An outboard body having a predetermined length in a rectangular cross section and having a gear accommodating chamber formed in a certain section of the inside thereof and a key groove formed in an inner circumferential surface of a rear end portion and being freely inserted into the out casing;

An inbody which is inserted into the outbody in a concentric manner and has a grouting jet opening communicated with an inner passage at a tip side thereof and a key coupled to the key groove at a rear end to rotate integrally with the outbody;

Left and right wing gears rotatably supported on both sides of the outboard body and positioned in the gear housing compartment;

A left and a right chain having one end hinged to the left and right wing gears and the other end being wound on a wing gear and connected to the inverse side via a tension spring;

Right and left stirring wings connected to the gear shafts of the left and right wing gears and positioned outside the out body;

A spring tension plate fixed to the incidence side and positioned in the gear accommodating chamber; And

The left and right wing gears are rotated through the left and right chains by a tensile repulsive force when one end is connected to the spring tension plate and the other end is connected to the left and right chains to lock- And a tension spring for providing a rotational force to the spring.

Here, left and right stirring vane stoppers for restricting the amount of rotation of the left and right stirring vanes may be further provided on both sides of the intake valve.

In addition, the left and right wing gears may be provided in two pairs before and after.

According to the enlarged ground anchor construction method using the enlarged excavation stirrer of the present invention, it is possible to form a soilless cement bulb body by an enlarged excavation and injection of a grout material in a primary settlement section, The anchor tension can be increased by forming the deep bulge and increasing the permissible adhesive force of these cement bulb and deep bulb. Therefore, the construction quantity of the anchor can be reduced and the air shortening and the construction cost can be reduced.

In addition, the enlarged digging and tilting apparatus is capable of expanding and digging automatically by the internal spring force as soon as the left and right stirring blades exit the front end of the out casing, and after the enlarging excavation, the left and right stirring blades push the out casing It can be applied to ground anchor construction by easy removal by being automatically folded by operation and housed inside the out casing, and it is advantageous that no separate driving power is required.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
FIGS. 1A to 1G are views showing a construction state according to a process sequence of an anchorage enlargement improvement anchor construction method using an enlarged excavating and stirring apparatus according to the present invention.
2 is an enlarged cross-sectional view taken along line AA of Fig.
3 is a partially exploded exploded perspective view of an embodiment of an enlarged excavation stirring apparatus applied to a construction method of the present invention.
Figure 4 is a plan view of Figure 3;
5 is a sectional view taken along line BB of Fig.
6 is a sectional view taken along the line CC of Fig.
Figure 7 is a front view of Figure 3;
8 is a view showing the operating states of the left and right stirring blades in Fig.
9 is a structural view showing another modified example of an enlarged excavation stirring apparatus applied to the construction method of the present invention.
10 is a cross-sectional view taken along line DD of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

First, a fixing anchorage enlargement type improved ground anchor construction method using an enlarged excavation stirring apparatus of the present invention will be described.

Out casing  Punching work by

First, as shown in FIG. 1, the outcasing 6 is introduced into the soil layer 5 up to the free long section S1, and the boring operation is performed through the inside of the outcasing 12. The out casing 6 is mounted on the perforation equipment (not shown) together with the inner casing 5 of FIG. 1B to be described later and driven. The drilling operation can be performed, for example, by supplying water pressure to the inside of the out casing 12. [

Soil cement  Bulb forming operations (expanded excavation and Soil cement Stirring )

Next, as shown in FIG. 1B, the enlarged excavation stirring apparatus 10 is connected to the tip end of the inner casing 5, and then inserted into the inside of the out casing 6.

Thereafter, the grout liquid is injected into the inner casing 5, and at the same time, the inner casing 5 is pivoted to the full length of the fixing section S2.

In this case, expansion and pumping are performed by the left, right, left and right stirring blades 20a and 20b extended in the fixing section S2, and the grout liquid is sprayed from the tip of the enlarged excavation stirring device 10, At the same time. The agitation is carried out between the grout solution and the small-sized soil to form soilless cement in the settlement section S2. The soilless cement forms a soilless cement bulb (200) after curing and curing.

1C, the inner casing 5 is further inserted to the tip of the fusing station section S1, which has been enlarged and excavated as shown in FIG. 1D, and then the enlarged excavation stirring The outer casing (6) is removed from the inner casing (5) together with the device (10). At this time, while the enlarged excavation stirring apparatus 10 is removed from the out casing 6, the expanded left, right and left stirring vanes 20a and 20b pass through the out casing 6 in a folded state.

This is to form the inner cement bulb 210 by injecting the cement grout liquid into the central axis of the soil cement bulb 200 in the post-process.

Internal cement bulb forming work

Next, as shown in FIG. 1E, the grouting injection hose 9 is inserted up to the front end of the out casing 6, and the grouting fluid is injected into the grouting injection hose 9 until the inside of the out casing 6 is filled .

anchor Steel hull  Installation tasks

Next, as shown in FIG. 1F, the anchor steel hull 8 is inserted into the outer casing 6 filled with the cement grout solution, and then the outer casing 6 is removed from the soil foundation as shown in FIG. 1g. For example, the anchor steel hull 8 may be such that the inner bottom body 8b is integrally coupled to the PC stranded wire 8a.

At this time, the anchor steel hull 8 is pulled in until the front end of the anchor steel hull 8 is positioned at the front end of the out casing 6. Therefore, the anchor steel hull 8 is located inside the inner cement bulb 210.

After a certain curing time has elapsed, the soil cement and cement grout solution are hardened and the anchor steel hull 8 is bonded to the inner cement bulb 210 formed in the free long section S1 and the fixing section S2, do.

2, the anchor steel hull 8, the inner cement bulb 210, and the soil cement bulb 200 are formed in the radial direction from the center portion.

According to this method, the anchor steel hull 8 is not attached directly to the soil cement bulb 200 but is attached through the inner cement bulb 210 in the fixing section S2.

Therefore, when a tensile force is generated in the anchor steel hull 8, a shear stress is generated between the inner cement bulb 210 and the soil cement bulb 200 to increase the allowable design tension of the anchor steel hull 8. For this reason, it is possible to reduce the amount of construction of the anchor, thereby shortening the construction time and construction cost.

That is, the allowable anchor tension (T _a ) = π × d _e × S ₂ × τ _a ,

- d _e : Expansion of the settlement section The diameter (cm) of the aged soil cement bulb

- S ₂ : Length of settlement length (cm)

- τ _a : Allowable shear stress (Kg / cm ² )

d _e = 40 cm, S ₂ = 800 cm and N = 5, the allowable anchor tension (T _a ) is 3.14 x 40 x 800 x 0.09 x 5 = 45,216 kg (45.216 ton).

On the other hand, when the allowable adhesive force Fs between the inner cement bulb 210 and the sill cement bulb 200 expanded and agitated in the fixing long section S2 by the secondary injection is calculated,

Allowable Adhesive Force (Fs) = π × d _a × S ₂ × τ _s = 3.14 × 15 × 800 × 15/4 = 141,300 Kg (141.3 tons)

- d _a : Outcasing diameter of settlement section (cm)

- τ _s : Allowable Shear Stress (Kg / cm ² )

(τ _s = q _u / 4, q _u = Uniaxial compressive strength of expanded cement cement bulb, q _u = 15 kg / cm ² )

Therefore, Fs / T _a = 3.13? 1.2.

In this way, the diameter of the enlarged stirring cement bulb 200 is 40 cm and the uniaxial compressive strength q _u is 8 kg / cm ² The permissible tension of the anchor steel hull 8 can be designed up to 45.2 tons and the permissible design of the anchor according to the N value of the settlement section S2 and the length of the anchorage field, The tension can be increased.

On the other hand, in this method, The outer casing 6 is inserted up to the tip of the enlarged excavation fusing section S1 so that the enlarging excavation stirring device 10 is positioned inside the out casing 6 and then the inner casing 5 is placed in an enlarged excavation stirring device And the grout liquid is injected into the outer casing 6 through the inner passage of the inner casing 5 while being pulled out from the outer casing 6 together with the outer casing 10 to fill the grout liquid into the outer casing 6.

Meanwhile, the enlarged excavation stirring apparatus 10 used in the present method can be implemented in two forms according to a method of rotating the left and right stirring vanes 20a and 20b.

In the first embodiment, the enlarged excavation stirring apparatus 10 is constructed by a rag gear method as shown in Figs.

3 to 6, the enlarged excavating apparatus 10 includes an outboard 12, an inbuard 14, left and right wing gears 16a and 16b, upper and lower rack gears 18a and 18b, (20a, 20b), a spring compression plate (22), and a compression spring (24).

The outbody 12 has a length smaller than that of the out casing 6 and is freely inserted into the inside of the out casing 6. The outbody 12 has a rectangular cross section, and a gear receiving chamber 121 formed in a certain section of the inside thereof and a key groove 122 are formed in the inner peripheral surface of the rear end portion. The out body 12 is provided with a plurality of O-rings 11a, 11b, and 11c to prevent the grout material from flowing into the surface of the out body 14 which is in sliding contact with the IN-

The key groove 122 is formed on the inner peripheral surface of the rear end side of the outbody 12 and has a structure in which the unlocking groove 122a formed in the axial direction and the locking groove 122b formed in the circumferential direction are communicated with each other Have.

The inbody 14 is inserted into the outbody 12 through a concentric axis so as to be able to rotate and slide. The inbody 14 has a hollow shape and at least one grouting jet opening 141 communicating with an inner passage is formed on the tip side. The body 14 is provided with a key 13 coupled to a key groove 122 on the outboard body 12 at a rear end thereof. The key 13 is fixed to the body 14 and moves linearly by a predetermined amount in the unlocking groove 122a which is an axial section of the key groove 122 of the out body 12. In the lock groove 122b, Rotational movement is performed.

The inbody (14) is connected to the distal end of the inner casing (5). Therefore, the invisible body 14 linearly moves and rotates integrally along the driving direction of the inner casing 5. The engagement means of the inner casing 5 may be a well-known coupling coupling.

The left and right wing gears 16a and 16b are rotatably supported on both sides of the outboard body 12 and are located in the gear accommodating chamber 121. [ The left and right wing gears 16a and 16b are meshed with the upper and lower rack gears 18a and 18b. Therefore, when a forward movement force is applied to the upper and lower rack gears 18a and 18b, the left wing gear 16a is rotated in the counterclockwise direction and the right wing gear 16b is rotated in the clockwise direction in FIGS. 3 and 8 do.

The upper and lower rack gears 18a and 18b are vertically arranged in the gear housing chamber 121 to engage with the left and right wing gears 16a and 16b, respectively. At this time, the upper and lower rack gears 18a and 18b are disposed facing each other and engaged with the left and right wing gears 16a and 16b in a one-to-one correspondence. Therefore, the left and right wing gears 16a and 16b rotate in different directions when the upper and lower rack gears 18a and 18b are moved forward.

The left, right and left stirring blades 20a and 20b are connected to the gear shafts 17a and 17b of the left and right wing gears 16a and 16b and are positioned outside the outboard body 12. Therefore, when rotational force is applied to the left and right wing gears 16a and 16b in a state where the enlarged excavation stirring device 10 is located inside the out casing 6, the left, right, left and right stirring blades 20a and 20b, Have a rotational force to widen in different directions.

The spring compression plate 22 is fixed to the invisible side 14 and is located in the gear accommodating chamber 121. The spring compression plate 22 may be movably mounted to the inbody 14 to adjust the compression force of the compression spring 24. At this time, a nut (not shown) for fixing the spring compression plate 22 may be installed in the threaded section of the inbodies 14.

One end of the compression spring 24 is supported by the spring compression plate 22 and the other end is supported by the upper and lower rack gears 18a and 18b. The compression spring 24 is compressed and the compression force of the compression spring 24 is applied to the upper and lower rack gears 18a and 18b to move the key 13 in the circumferential direction of the keyway 122. [ And 18b to provide rotational force to the left and right stirring blades 20a and 20b.

On the other hand, left and right stirring blades stoppers 144 for restricting the amount of rotation of the left, right and left stirring blades 20a, 20b are further provided on both sides of the body 14.

1D, the left, right and left stirring blades 20a and 20b are folded in the inside of the out casing 6, The compression springs 24 are compressed and the upper and lower rack gears 18a and 18b receive the forward movement force to transmit the left and right wing gears 16a and 16b The left, right and left stirring blades 20a and 20b are subjected to the force of the opening.

In this state, as shown in FIG. 1B, when the inner casing 5 is expanded and moved forward by the rotation of the inner casing 5, the left and right left and right stirring blades 20a 20b are rotated until they come into contact with the left and right stirring blades stopper 144 to have a wider rotation area than the cross section of the outcasing 6 and the grouting solution flowing through the inner casing 5 Is formed by the agitation of the soil cement bulb.

On the other hand, the left and right wing gears 16a and 16b may be provided with two pairs before and after the left and right stirring blades 20a and 20b.

When the inner casing 5 is removed from the outer casing 6 together with the enlarged excavating and stirring apparatus 10 after the completion of the stirring, the compression springs 24 are compressed and the left and right left and right stirring blades 20a, As shown in FIG. 1 (d), and then exits the inside of the out casing 6 as shown in FIG.

In the second embodiment, as shown in Figs. 9 and 10, an enlarged excavation stirring apparatus 10 is constructed by a chain gear method.

9 and 10, the enlarged excavation stirring apparatus 10 of the second embodiment includes the outboard body 12, the inbodies 14, the left and right wing gears 16a and 16b, And right and left stirring blades 20a and 20b.

The forward movement of the inboard 14 when the key 13 is positioned in the circumferential direction of the keyway 122 is transmitted to the right and left sides of the key groove 122 by the tension of the tension spring 25 connected to the spring tension plate 23. [ Right and left wing gears 20a and 20b by rotating the left and right wing gears 16a and 16b by pulling the left and right wings 17a and 17b.

At this time, the left and right chains 17a and 17b are hinged to the left and right wing gears 16a and 16b, respectively, and the other end is wound on the left and right wing gears 16a and 16a, And is connected to the side of the invisible body 14 via the spring tension plate 23. [ Further, the spring tension plate 23 is fixed to the invisible side 14 and is located in the gear accommodating chamber 121.

Therefore, when the lock key 13 is engaged with the key groove 122, the left and right wing gears 16a and 16a are rotated through the left and right chains 17a and 17b by the tensile reaction force of the tension spring 25, And the right and left stirring blades 20a and 20b to be able to expand and stir and stir.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

5: Inner casing
6: Out casing
12: Out Body
14: Inbodies
16a, 16b: Left and right wing gears
17a, 17b: Left and right chain
18a, 18b: upper and lower rack gears
20a and 20b: left and right stirring blades
22: spring compression plate
23: spring tension plate
24: Compression spring
25: Tension spring
144: Stirring wing stopper

Claims (8)

A step of inserting the out casing 6 into the free earth section 5 through the free casing section S1 and performing the boring operation through the inside of the out casing 12;
An enlarged excavation stirring apparatus 10 is attached to the front end of the inner casing 5 and then inserted into the inside of the out casing 6. Then the distal end of the enlarging excavation stirring apparatus 10 is inserted through the inner passage of the inner casing 5 Injecting the grout liquid and performing an enlargement excavation stirring operation in the fixing section (S2);
After the enlargement of excavation and agitation of the settlement section is completed, the inner casing 5 is removed from the out casing 6 together with the enlargement excavator 10, and then the out casing 6 is moved to the enlarged excavation settlement section Lt; RTI ID = 0.0 > S1) < / RTI >
Inserting the grouting solution into the grouting injection hose 9 until the inside of the out casing 6 is filled after the grouting injection hose 9 is inserted to the front end of the out casing 6;
Removing the out casing 6 from the soil foundation after inserting the anchor steel hull 8 into the inside of the out casing 6,
The enlarged excavation stirring apparatus (10)
An outboard body 12 having a predetermined length in a rectangular cross section and having a gear accommodating chamber 121 formed in a certain section of the inside thereof and a key groove 122 on the inner peripheral surface of the rear end portion and being freely inserted into the out casing 6;
And a key (13) inserted into the outer body (12) in a concentric manner and coupled to the keyway (122) at a rear end thereof with a grouting jetting port (141) An inbody (14) which rotates integrally with the body (12);
Left and right wing gears (16a, 16b) rotatably supported on both sides of the outboard body (12) and positioned in the gear receiving chamber (121);
Upper and lower rack gears (18a, 18b) arranged above and below the gear accommodating chamber (121) and engaging with the wing gear (16);
Left and right stirring blades 20a and 20b connected to the gear shafts of the left and right wing gears 16a and 16b and positioned outside the outboard body 12;
A spring compression plate (22) fixed to the inboard (14) side and positioned in the gear storage chamber (121); And
And the rack gears 18a and 18b are supported by the spring compression plate 22 at one end and the pair of rack gears 18a and 18b at the other end to couple the key 13 to the key groove 122, And a compression spring (24) for moving the left and right stirring blades (18a, 18b) to provide rotational force to the left, right and left stirring blades (20a, 20b). . A step of inserting the out casing 6 into the free earth section 5 through the free casing section S1 and performing the boring operation through the inside of the out casing 12;
An enlarged excavation stirring apparatus 10 is attached to the front end of the inner casing 5 and then inserted into the inside of the out casing 6. Then the distal end of the enlarging excavation stirring apparatus 10 is inserted through the inner passage of the inner casing 5 Injecting the grout liquid and performing an enlargement excavation stirring operation in the fixing section (S2);
When the excavation and the agitation of the settlement section are completed, the outcasing 6 is inserted to the tip of the enlarged excavation settlement section S1 to place the enlarged excavation stirring apparatus 10 inside the outcasing 6 The grouting solution is injected through the inner passage of the inner casing 5 while the inner casing 5 is pulled out from the outer casing 6 together with the enlarged excavation stirring device 10 and the grouting solution is injected into the outer casing 6 Filling;
Removing the outer casing 6 from the soil layer after inserting the anchor steel hull 8 into the outer casing 6 filled with the grout liquid,
The enlarged excavation stirring apparatus (10)
An outboard body 12 having a predetermined length in a rectangular cross section and having a gear accommodating chamber 121 formed in a certain section of the inside thereof and a key groove 122 on the inner peripheral surface of the rear end portion and being freely inserted into the out casing 6;
And a key (13) inserted into the outer body (12) in a concentric manner and coupled to the keyway (122) at a rear end thereof with a grouting jetting port (141) An inbody (14) which rotates integrally with the body (12);
Left and right wing gears (16a, 16b) rotatably supported on both sides of the outboard body (12) and positioned in the gear receiving chamber (121);
Upper and lower rack gears (18a, 18b) arranged above and below the gear accommodating chamber (121) and engaging with the wing gear (16);
Left and right stirring blades 20a and 20b connected to the gear shafts of the left and right wing gears 16a and 16b and positioned outside the outboard body 12;
A spring compression plate (22) fixed to the inboard (14) side and positioned in the gear storage chamber (121); And
And the rack gears 18a and 18b are supported by the spring compression plate 22 at one end and the pair of rack gears 18a and 18b at the other end to couple the key 13 to the key groove 122, And a compression spring (24) for moving the left and right stirring blades (18a, 18b) to provide rotational force to the left, right and left stirring blades (20a, 20b). . delete A step of inserting the out casing 6 into the free earth section 5 through the free casing section S1 and performing the boring operation through the inside of the out casing 12;
An enlarged excavation stirring apparatus 10 is attached to the front end of the inner casing 5 and then inserted into the inside of the out casing 6. Then the distal end of the enlarging excavation stirring apparatus 10 is inserted through the inner passage of the inner casing 5 Injecting the grout liquid and performing an enlargement excavation stirring operation in the fixing section (S2);
When the excavation and the agitation of the settlement section are completed, the outcasing 6 is inserted to the tip of the enlarged excavation settlement section S1 to place the enlarged excavation stirring apparatus 10 inside the outcasing 6 The grouting solution is injected through the inner passage of the inner casing 5 while the inner casing 5 is pulled out from the outer casing 6 together with the enlarged excavation stirring device 10 and the grouting solution is injected into the outer casing 6 Filling;
Removing the outer casing 6 from the soil layer after inserting the anchor steel hull 8 into the outer casing 6 filled with the grout liquid,
The enlarged excavation stirring apparatus (10)
An outboard body 12 having a predetermined length in a rectangular cross section and having a gear accommodating chamber 121 formed in a certain section of the inside thereof and a key groove 122 on the inner peripheral surface of the rear end portion and being freely inserted into the out casing 6;
And a key (13) inserted into the outer body (12) in a concentric manner and coupled to the keyway (122) at a rear end thereof with a grouting jetting port (141) An inbody (14) which rotates integrally with the body (12);
Left and right wing gears (16a, 16b) rotatably supported on both sides of the outboard body (12) and positioned in the gear receiving chamber (121);
The left and right wing gears 16a and 16b are hinged on one end and the other end is wound on the wing gears 16a and 16a and the left and right wing gears 16a and 16b are connected to the left and right wing gears 16a and 16b, A right chain 17a, 17b;
Left and right stirring blades 20a and 20b connected to the gear shafts of the left and right wing gears 16a and 16b and positioned outside the outboard body 12;
A spring tension plate (23) fixed to the inboard (14) side and positioned in the gear accommodating chamber (121); And
The left and right chains 17a and 17b are connected to the spring tension plate 23 at one end and the other end is connected to the left and right chains 17a and 17b to couple the lock key 13 to the key groove 122, And a tension spring (25) that rotates the left and right wing gears (16a, 16a) through the left and right wing wheels (17a, 17b) to provide rotational force to the left and right stirring blades (20a, 20b) An improved ground anchor construction method using an agitator. 3. The method according to claim 1 or 2,
And a left and right stirring vane stopper (144) for restricting the amount of rotation of the left and right stirring vanes (20a, 20b) is provided on both side surfaces of the inbody (14) Improved ground anchor construction method. 5. The method of claim 4,
And a left and right stirring vane stopper (144) for restricting the amount of rotation of the left and right stirring vanes (20a, 20b) is provided on both side surfaces of the inbody (14) Improved ground anchor construction method. 3. The method according to claim 1 or 2,
Wherein two pairs of left and right wing gears (16a, 16b) are provided before and after the wing gears (16a, 16b). 5. The method of claim 4,
Wherein two pairs of left and right wing gears (16a, 16b) are provided before and after the wing gears (16a, 16b).

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