WO1999060219A1

WO1999060219A1 - Removable ground anchorage and method for disassembling tensile wires

Info

Publication number: WO1999060219A1
Application number: PCT/KR1999/000231
Authority: WO
Inventors: Chang Hoon Lee
Original assignee: Chang Hoon Lee
Priority date: 1998-05-19
Filing date: 1999-05-11
Publication date: 1999-11-25
Also published as: AU3734899A; JP2002515558A

Abstract

A removable ground anchorage and a method for disassembling tensile wires (W) are disclosed. The anchorage includes a cylinder (10) in which a separation engaging wall is formed at its inner upper portion, a center through hole (11) is formed at a lower portion of the upper side separation engaging wall (14) at the center portion of the body, and a plurality of radially formed outer through holes (12) formed around the separation engaging wall (14), a corn compresssing ring (27) inserted into an upper portion of the center through hole (11) of the cylinder (10) and having a tapered insertion portion formed at an inner upper side of the same, an anchor disassembling tensile wire (W) engaging corn (20) inserted into the insertion portion of the corn compressing ring (27), wherein the tensile wire (W) is inserted, a plurality of anchor tensile wire (W) engaging corns (20) inserted into an upper portion of the outer through hole for engaging the tensile wires (W1), a spacer inserted between the anchor disassembling tensile wire engaging corn (20) and the anchor tensile wire engaging corn (20), an upper cover for preventing the anchor disassembling tensile wire engaging corn (20) and the anchor tensile wire engaging corn (20) from being escaped, and a cap for protecting the inner sides of the cylinder (10) and preventing a penetration of the mortar, a lower cover engaged to a lower portion of the cylinder (10).

Description

REMOVABLE GROUND ANCHORAGE AND METHOD FOR DISASSEMBLING TENSILE WIRES

TECHNICAL FIELD The present invention relates to a removable ground anchorage and a method for disassembling tensile wires, and in particular to an improved removable ground anchorage and a method for disassembling tensile wires which are capable of easily disassembling a ground anchorage installed under the ground after an anchoring construction is performed when building a continuous underground wall for an architecture or civil construction.

BACKGROUND ART

Generally, a permanent ground anchorage is an anchorage which is installed in order to prevent a movement or distortion of a certain construction when building a construction or tower at a underground water area, a slanted area, an earthquake area, etc. As a under fixing structure which is removed after a completion of the construction, there is a removable ground anchorage.

When constructing a underground construction for a high building, a underground subway, and etc., a plurality of H-beams are used in order to build a solid wall and other type walls using a large size wooden bar. In this case, the ground pressure of the bars is increased as the depth is increased. Namely, the pressure is a few tons. In this case, the solid wall may be broken for thereby causing a big accident at the construction site. In order to prevent the above- described solid wall, a reinforced structure in which a plurality of bars are installed in the horizontal and vertical directions using a large size of H-beams is used. However, in the reinforced support structure, the period of the construction may be extended, the work efficiency is decreased, and the cost of the construction may be increased due to the complicate structure in which a plurality of bars are installed like a web.

As another construction method, there is known a underground continuous wall construction method which has advantages in that the surface of the all is non-uniform for thereby requiring a surface smoothing process. In this case, a lot amount of noises and dusts are generated. Therefore, a continuous wail construction method is generally used based on the anchorage method.

In the U.S. Patent Serial No. 4,592,178, a plurality of wing type arms are pivoted for thereby implementing an anchorage function by spreading the arms at the underground site. The U.S. Patent Serial No. 4,832 discloses an anchorage construction method. In this case, the anchorage tensile wires remain after the completion of the construction, so that there is a problem.

The Japanese Patent Publication Pyung 3-77,891 discloses a removing type anchorage. In this removable type anchorage construction method, removable cores are grounded at the underground site, and various types of tension wire engaging structures are anchored using a plurality of spacers. Thereafter, the cores are removed, so that the engaging states between the spacers and the tensile engaging structures are disassembled for thereby removing the tensile wires. However, since it is impossible to maintain a strong connection between the spacers and the tensile wire engaging function with respect to the cores, its original function may be lost due to a natural disassembling operation after the completion of the construction. The Japanese Patent Publication Pyung 3-77891 discloses a core member having a tapered conical portion, a tensile member having its end portion inserted into a tension member groove, and a common hole member positioned between each portion of the tapered conical portion. In this patent, the tapered conical portion is lifted up over the entire length portions of the anchorage, and the tensile member is ejected from the common hole member and becomes a free state from a restriction of a grout member for thereby removing the anchorage. The Japanese Patent Application Pyung 2-5206 discloses a un-bonded type core member, a spacer positioned around the core member and formed by a plurality of cores when disassembling the same, and a tensile member installed at the outer portions of the core member and spacer. In this patent, when the core member is removed, the spacer is broken, so that the tensile members are removed.

However, in this case, since the tensile member is attached to only one wall at the spacer, it is difficult to effectively install the tensile members which are capable of resisting up a certain pressure. Even when installing the anchorage in order to insert the anchorage into the underground site, it is difficult to insert the same into the underground site using the assembled state. In addition, since the same is bonded with neighboring mortar, it is impossible to separate the same. Therefore, it is judged that the above-described patent is not actually adapted.

The inventor of the present invention discloses the Korean Patent application No. 93-7616 and 97-36215 in which the anchorage disassembling tensile wire engaging cone is installed at the center of the tensile wire engaging member in order to overcome the above-described problems, and the spacers are formed along its outer surfaces, and the anchorage tensile wire engaging cones are closely installed.

In this anchorage, the support structure may be easily disassembled by removing the anchorage disassembling tensile wire engaging member and breaking down the spacers by the tensile force of the tensile wires. Therefore, the engaging force of the engaging cone is lost by vibrating or tensing the neighboring tensile wires, so that it is possible to easily remove the tensile wires above the ground.

However, in the above-described patents, when disassembling the tensile wires, the engaging member is divided by a certain divider, and then the tensile wires are disassembled. In this case, a large force is required. Therefore, a large size ejecting apparatus is needed. At the time when the center ring is broken, the tensile wires are quickly pulled out, so that it is impossible to implement a work stability.

In addition, the diameter of the cylinder which is the core factor of the method for removing the tensile wires is increased dependent on the size of the engaging cone. In this case, the diameter of the hole is increased during the anchorage construction. Therefore, the construction cost is increased.

DISCLOSURE OF THE INVENTION

Accordingly, it is an object of the present invention to provide a removable ground anchorage and a method for disassembling tensile wires which are capable of easily disassembling a ground anchorage installed under the ground after an anchoring construction is performed when building a continuous underground wall for an architecture or civil construction. To achieve the above object, there is provided a removable ground anchorage according to a first embodiment of the present invention which includes a cylinder in which a separation engaging wall is formed at its inner upper portion, a center through hole is formed at a lower portion of the upper side separation engaging wall at the center portion of the body, and a plurality of radially formed outer through holes formed around the separation engaging wall, a corn compressing ring inserted into an upper portion of the center through hole of the cylinder and having a tapered insertion portion formed at an inner upper side of the same, an anchor disassembling tensile wire engaging corn inserted into the insertion portion of the corn compressing ring, wherein the tensile wire is inserted, a plurality of anchor tensile wire engaging corns inserted into an upper portion of the outer through hole for engaging the tensile wires, a spacer inserted between the anchor disassembling tensile wire engaging corn and the anchor tensile wire engaging corn, an upper cover for preventing the anchor disassembling tensile wire engaging corn and the anchor tensile wire engaging corn from being escaped, a cap for protecting the inner sides of the cylinder and preventing a penetration of the mortar, a lower cover engaged to a lower portion of the cylinder, an engaging shoulder in which the corn compressing ring is engaged to an inner upper portion of the center through hole and which is broken during a disassembling process, and a stop ring formed at an upper surface intermediate portion of the lower cover for preventing the movement of the anchor disassembling tensile wire engaging corn so that the tensile wire is ejected during the disassembling process.

To achieve the above object, there is provided a method for disassembling tensile wires according to a second embodiment of the present invention which includes an engaging shoulder breaking step in which a corn compressing ring of an anchor disassembling tensile wire engaging member exceeds a pressure which is generated by the anchor tensile wire engaging corn by an ejecting force of the anchor disassembling tensile wire during a tensile wire disassembling process for thereby breaking the engaging shoulder, and a step in which the anchor disassembling tensile wire engaging corn of the escaped anchor disassembling tensile wire engaging member contacts with the stop ring of the lower cover for thereby preventing a movement and the tensile wires are separated from the anchor disassembling tensile wire engaging corn. To achieve the above object, there is provided a removable ground anchorage according to a third embodiment of the present invention which includes a cylinder in which a separation engaging wall is formed at its inner upper portion, a center through hole is formed at a lower portion of the upper side separation engaging wall at the center portion of the body, and a plurality of radially formed outer through holes formed around the separation engaging wall, a cylindrical anchor disassembling tensile wire engaging ring inserted into an upper portion of a center through hole of the cylinder and having a friction member at an inner surface for engaging the disassembling tensile wire, a plurality of anchor tensile wire engaging corns inserted into an upper portion of the outer through hole for engaging the tensile wires, a lower cover engaged to a lower portion of the cylinder and having a stop shoulder formed at a center portion for preventing movement of the engaging ring, an engaging shoulder fixed so that the anchor disassembling tensile wire engaging ring is engaged at an inner surface upper portion of the center through hole and broken during the disassembling process, a spacer inserted between the anchor disassembling tensile wire engaging ring and the anchor tensile wire engaging corn, an upper cover for preventing the anchor disassembling tensile wire engaging ring and the anchor tensile wire engaging corn, and a cap for protecting the inner portions of the cylinder and preventing a penetration of water or mortar.

To achieve the above object, there is provided a method for disassembling tensile wires according to a fourth embodiment of the present invention which includes an engaging shoulder breaking step in which an engaging ring of an anchor disassembling tensile wire engaging member exceeds a pressure which is generated by the anchor tensile wire engaging corn by an ejecting force of the anchor disassembling tensile wire during a tensile wire disassembling process for thereby breaking the engaging shoulder, and a step in which the engaging ring of the escaped anchor disassembling tensile wire engaging member contacts with the stop ring of the lower cover for thereby preventing a movement and the tensile wires are separated from the anchor disassembling tensile wire engaging ring.

Additional advantages, objects and features of the invention will become more apparent from the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

Figures 1 through 10 are views illustrating an embodiment of a removable ground anchorage and a method for disassembling tensile wires according to the present invention, of which: Figure 1A is a cross-sectional view illustrating the construction that an anchorage is installed according to the present invention;

Figure 1 B is a view illustrating the construction that an inner lower member is installed into an anchorage according to the present invention; Figure 2 is an exploded view illustrating an embodiment of an anchorage according to the present invention;

Figure 3 is a cross-sectional view illustrating the construction that an anchorage is assembled according to the present invention;

Figure 4 is a perspective view illustrating a cylinder of an anchorage according to the present invention; Figures 5 through 7 are cross-sectional views illustrating a disassembling process of an anchorage according to the present invention;

Figures 8A and 8B are views illustrating an assembling and disassembling operation of a conical engaging member according to the present invention; Figure 9 is a plan view illustrating an anchorage according to the present invention; and

Figure 10 is a plan view illustrating another example of a spacer according to the present invention; Figure 11 is a cross-sectional view illustrating another embodiment of an anchorage according to the present invention;

Figures 12 through 17 are views illustrating a removable ground anchorage and a method for disassembling tensile wires according to another embodiment of the present invention, of which: Figure 12 is an exploded perspective view illustrating an anchorage according to the present invention;

Figure 13A is a cross-sectional view illustrating the construction that an anchorage is assembled according to the present invention; and

Figure 13B is a cross-sectional view illustrating a tensile wire engaging member for an anchorage disassembling operation according to the present invention;

Figures 14 through 16 are cross-sectional views illustrating a disassembling operation of an anchorage according to the present invention; and Figure 17 is a cross-sectional view illustrating another embodiment of an anchorage according to the present invention.

MODES FOR CARRYING OUT THE INVENTION

The embodiments of the present invention will be explained with reference to the accompanying drawings.

In Figures 1 through 4, reference numeral 10 represents a cylinder, 11 represents a center through hole formed at the center line of the cylinder 10, 12 represents an outer through hole formed around the center through hole 11 , 13 represents an upper surface of the cylinder 10, and 14 represents an upper side separation engaging wall formed at an upper portion of the cylinder 10. The cylinder 10 is cylindrically formed. The center through hole 11 is formed at the center portion of the upper side separation engaging wall 14. A plurality of outer through holes 12 are radially formed with respect to the center through hole 11.

An anchorage disassembling tensile wire engaging member 30 is inserted into the upper side portion of

A plurality of the contacting grooves 15 into which the anchorage tensile wire engaging corns 20' are inserted are formed at the upper portion of the center through hole 11 of the cylinder 10 by the number corresponding to the number of the anchorage tensile wire engaging corns 20".

The anchorage disassembling tensile e wire engaging member 30 includes a corn pressing ring 27 inserted into an upper portion of the center through hole 11 of the cylinder 10, and an anchorage disassembling tensile wire engaging corn 20 inserted into a taper type insertion portion 27a of the com processing ring 27. A spacer 35 is inserted between the corn pressing ring 27 and the anchorage tensile wire engaging corn 20'. The anchorage disassembling tensile wire W and the anchorage tensile wire engaging corn 2- are used for fixing the anchorage tensile wire W and the anchorage tensile wire W. A conventional wedge com or a split strong grip may be used for the engaging corns 20 and 20'.

In the anchorage disassembling tensile wire engaging corn 20 and the anchorage tensile wire engaging com 20', a protruded portion 24 is conically formed on an outer surface of the inner tensile wire insertion hole 23, and a ring groove 25 is formed on an outer surface of the upper portion having a large diameter, so that an elastic ring 21 is inserted into the ring groove 25, whereby the split engaging particles 20a, 20b and 20c become integral with respect to the cut away portion 22 in a conical shape. The contacting groove 15 of the cylinder 10 is formed in a tapered shape, so that the anchorage tensile engaging corn 20' is tightly engaged.

The tensile wire engaging corns 20 and 20' have the same width and size. In another embodiment, the tensile wire engaging corns 20 and 20' may have different sizes for thereby providing a different strength and assembling process. The elastic ring 21 is integrally formed in a multiply split shape.

As shown in Figures 2 and 3, the spacer 35 contacts with an outer surface of the con pressing ring 27 and contacts with an outer surface of the tensile wire engaging com 20'. The contact surfaces 35a, 35b and 35c are formed in a circular shape for thereby implementing a tighter contact. As shown in Figure 9, the spacer 35 is formed so that the contact surfaces 35a, 35b and 35c contact with an outer surface of the anchorage tensile wire engaging corn 20' and the com pressing ring 27. As shown in Figure 10, the contact surfaces 35d and 35e may contact with the outer surfaces of the anchorage tensile wire engaging com 20' and the corn pressing ring 27. The spacer 35 may be formed in various forms such as a bar shape or a polygonal shape. More than two anchorage tensile wire engaging corns 20' may be used. The spacer 35 may be formed to have a certain thickness. The shape and size of the same may be determined based on the shape of the major material of the same.

As shown in Figure 9 and 10, the number of the spacers 35 may be 6. The number of the same may be determined based in the number of the anchorage tensile wire engaging corns 20'.

The engaging shoulder 11 b formed at an inner upper portion of the center through hole 11 of the cylinder 10 is formed to be integral with the upper portion of the center through hole 11. As shown in Figure 3, the groove 11 a may be formed at the inner upper portion. A certain member such as an engaging ring is inserted thereinto. The engaging ring is a snap ring type in which a portion of the same is cut away. Split ends of the same are elastically inserted into the groove 11 a for thereby implementing a stable engagement in the groove 11a.

The corn pressing ring 27 has an outer diameter slightly smaller than the center through 11 so that the corn pressing ring 27 is inserted into the center through hole 11 and is placed on the shoulder 11 b. A taper shape insertion portion 27a is formed at the inner portion. A guide portion 27b is formed at a lower portion of the taper shape insertion portion 27a. In addition, the taper shape insertion portion 27a of the com processing ring 27 is conically tapered like the shape of the anchorage disassembling tensile wire engaging com 20, and an outer surface of the com processing ring 27 is formed to have the diameter at its upper and lower portions or is formed to have a diameter which is gradually increased from the upper portion to the lower portion except for a certain lower portion.

A stop ring 28 is formed at the upper center portion of the lower cover 41 for separating the anchorage disassembling tensile wire W from the anchorage disassembling tensile wire engaging corn 20.

The tensile wires W and W are a tensile wire which is used for a PC steel wire, other removable ground anchorage, etc. and are inserted into the interior of the tensile wire engaging corns 20 and 20', so that the protruded portion 24 formed on the inner circumferential surfaces of the tensile wire engaging corns 20 and 20' is not escaped from the surfaces of the steels.

An upper cover 40 is engaged at an upper portion of the cylinder 10 and a cap 50 is engaged thereon. The upper cover 40 is engaged to more than two bolt holes 13b formed at the upper surface 13 of the cylinder using a body 42, and a plurality of guide holes 45 and 46 having a diameter larger than those of the tensile wires W and W are formed.

The cap 50 is formed to have a space portion 51 for thereby implementing an enough movement of the tensile wires W and W and is engaged in such a manner that a known cap is engaged to an outer surface at the upper portion of the cylinder 10. In another embodiment, the cap 50 may be engaged to an outer portion at the upper portion of the cylinder using a ring formed of a friction member. Namely, a ring groove is formed on an inner surface of the cap 50 and on an outer surface of the cylinder 10. A ring having an excellent friction is inserted into the groove, and the cap 50 and the cylinder 10 are engaged in a known manner that a conventional cap is engaged.

A plurality of bolt holes corresponding to the bolt holes 13b of the cylinder 10 are formed at the cap 50, and the cap 50 and the upper cover 40 are engaged using a lengthy bolt. In addition, a cap integrally formed of a cap 50 and an upper cover 40 may be engaged to the cylinder.

A circular engaging shoulder 17 to which a rim portion of the cap 50 may be formed at an outer upper portion of the cylinder 10.

The lower cover 41 is engaged to the lower portion of the cylinder 10. The lower cover 41 is engaged to more than two bolt holes 13b formed on the lower surface 13a of the cylinder using the bolt 42. A plurality of guide holes 45 and 46 are formed so that the tensile wires W and W coated with a coating material are inserted in order for the mortar and the tensile wires not to contact with each other. At this time, The guide holes 45 and 46 are sealed, so that the mortar does not penetrate into the interior of the cylinder 10. In another embodiment of the present invention, the cylinder 10 and the lower cover may be integrally formed.

An inner lower engaging portion 43 is formed at a lower portion of the lower cover 41 for thereby engaging the inner lower member 60. As shown in Figures 2 and 3, the inner lower engaging portion 43 is implemented by a method that the cylindrical outer diameter portion 61 of the inner lower member 60 is engaged to an inner surface of the inner lower member engaging portion 43, or by a method that the outer diameter portion of the inner lower member engaging portion 43 is engaged to an inner surface of the inner lower member 60. At this time, the inner lower member 60 may be cylindrically formed. The outer surface of the same is formed roughly. A hole 60b may be formed on the outer wall of the inner lower member 60 so that the mortar inserted into the inner and outer portions of the inner and lower member 60 passes through a part of the cylindrical portion and becomes integral. The hole 60b is uniformly formed in the lengthy direction of the inner lower member 60. The inner lower member 60 may be formed of a metallic material, a fiber reinforced plastic, etc. In another embodiment, the inner lower member 60 may be cylindrically formed. A protruded portion 60a may be formed on an outer surface of the inner lower member 60. The protruded portion 60a and the hole 60b of the inner lower portion 60 may be formed at an entire outer portions or may be formed on a limited surface.

Figure 11 is a cross-sectional view according to another embodiment of the anchorage and illustrates a shape that an outer surface of the corn compressing ring 27 inserted into the center through hole 11 of the cylinder is tapered. The lower portion of the cylinder 10 may be formed of a taper surface 16 which is tapered to have a diameter which is gradually decreased from the upper portion to the lower portion. A plurality of grooves 19 are formed. A lower cover 41 is formed in a circular form. A stop ring 28 is formed at the upper center portion thereof. In the Korean Patent Publication No. 87-1862, there are provided a first ring member formed of a diameter increasing member, one or more than two second ring members which are formed at an inner side of the first ring member, an anchor head for moving at an inner wall of the second ring member in the lengthy direction and moving the second ring member at the inner wall of the first ring member in the lengthy direction and increasing the diameters of the first and second ring members, and an earth anchor formed a tensile anchor fixed to the anchor head.

In more detail, the earth anchor includes an outer ring(first ring member) in which one end of the hollow body is formed to be hollow, a groove is formed in the lengthy direction of the hollow body, a taper portion is formed at the end portion for thereby forming a comer portion, and a cut-away portion is formed at a boundary portion between the hollow portion and the corner portion, a sliding ring(second ring member in which the end portion of the hollow body is formed to be hollow, a groove is formed in the lengthy direction of the hollow body for thereby forming a comer portion, a cut-away portion is formed at a boundary portion between the hollow portion and the comer portion, and a taper portion is formed at the end portions, an anchor having a guide formed at an outer surface in the lengthy direction, and a tensile wire fixed to the anchor head.

In addition, a sliding ring is inserted into an interior of the outer ring, and an anchor head is inserted into the inner side of the sliding ring for thereby implementing a straight form. An inner wall of the outer ring is engaged to the guide formed on an outer surface of the slider ring, and an inner wall of the slider ring is engaged to the guide formed on an outer surface of the anchor head. The positions of the outer ring, slider ring and anchor head are aligned.

When the each anchor is installed at a hole portion formed on the ground, a panting force is formed by the tensile force of the anchor for thereby increasing the planting force of the anchor. In the present invention, the disassemble anchorage may be used by engaging the outer ring and slider ring(planting type reinforced body). If necessary, the planting type reinforced body may have a certain size and shape to be properly assembled with the anchorage. The processes of the removable ground anchorage installation and disassembling operation will be explained.

1. Assembling process of anchorage

The lower cover 41 having an anchor disassembling tensile wire corn stop member 28 is engaged to the cylinder 10 using the bolt 42. When the groove 11a is formed on an inner surface of the center through hole 11 of the cylinder 10 instead of the engaging shoulder 11 b, a snap ring corresponding to the groove is inserted. The anchor disassembling tensile wire engaging corn 20 is inserted into the interior of the corn compressing ring 27, and the com compressing ring 27 into which the anchor disassembling tensile wire engaging corn 20 is inserted is placed on the engaging shoulder 11b via the center through hole 11 of the cylinder 10. The lower portions of the spacers 35 are arranged to contact with the lower surface of the boundary portions of the center through hole 11 and the outer through hole 12 in alignment with the contacting groove 15 along the outer surface of the corn compressing ring 27, and the contact surface 35c contacts with the outer surface of the corn compressing ring 27.

Therefore, an insertion space of the anchorage tensile wire engaging com 20' is formed at an upper portion of the outer through holes 12 which are radially formed. The anchorage tensile wire engaging corns 20' are inserted into the thusly formed insertion spaces. The upper cover 40 is loosely engaged using the bolt 42. The center portions of the guide holes 45 and 46 formed at the upper cover 40 are formed at the same axis as the center portions of the assembled engaging corns 20 and 20'. When engaging the tensile wires W and W to the engaging corns 20 and 20', the tensile wires W and W pass through the guide holes 45 and 46 of the upper cover 40.

After the upper cover 40 is engaged, the tensile wires W and W having un-coated portions in their upper portions are inserted via the guide holes 45 and 46 formed at the lower cover 41 and advance to the lower portion of the engaging corns 20 and 20' via the outer through hole 12 and the center through hole 11 and is continuously inserted into the lower portion of the cylinder 10 until parts of the tensile wires W and W are exposed to the upper portion of the upper cover 40 via the guide holes 45 and 46 of the upper cover 40. In a state that the tensile wires W and W are exposed to the outside of the guide holes 45 and 46 of the upper cover 40, the upper cover 40 is made to contact with the cylinder 10 by tightly engaging the bolt 42, and then the cap 50 is engaged.

Thereafter, the reinforced body 60 is assembled with the lower cover 41. A plurality of spacers are arranged at a certain interval so that the tensile wires W and W extended over the reinforced body 60 are not tangled. The remaining processes are performed in a known anchoring manner.

2. Insertion and mounting processes

An anchor hole is formed on the ground and a casing is inserted thereinto. The assembled anchorage is inserted into the anchor hole. At this time, a certain pipe may be used. Thereafter, a grounding work is processed using a hardening material such as a mortar, cement, etc. In a state that the hardening material is not fully hardened, the casing is pulled out, and the hardening material such a mortar, cement milk, etc. is inserted at a high pressure. After the hardening material is hardened, the anchor tensile wire 20' which is exposed to the outside of the grounding hole is made tensile using the tensile machine.

At this time, as shown in Figures 1 and 2, in the case that the protruded portion 60a is formed on an outer surface of the reinforced body 60, the hole

60b is formed on an outer surface of the reinforced body 60, and the hardening material is integrally connected in the inner and outer portions of the reinforced body 60 for thereby increasing the engaging force of the anchor.

3. Anchor disassembling process

When forcibly pulling the anchor disassembling tensile wire W which is pulled out of the anchor disassembling tensile wire engaging corn 20 inserted into the interior of the corn compressing ring 27 using the tensile machine, as shown in Figure 5, the engaging shoulder 11b formed at the center through hole 11 of the cylinder is broken by a strong force of the com compressing ring 27 and downwardly drops, so that the corn compressing ring 27, the anchor disassembling tensile wire engaging com 20 and the anchor disassembling tensile wire W are escaped. At this time, as the com compressing ring 27 which provides a certain resistant force with respect to the anchor tensile wire engaging com 20' is escaped, the spacers 35 which contact with the outer surface of the corn compressing ring 27 are leaned to the center portion for thereby breaking the stable structure.

As shown in Figure 6, when the lower portion of the anchor disassembling tensile wire engaging com 20 inserted into the corn compressing ring 27 contacts with the upper portion of the com stop member 28, the corn compressing ring 27 does not advance. At this time, as shown in Figure 7, a certain distance is formed between the lower cover 41 and the lower portion of the com compressing ring 27. In this state, the anchor disassembling tensile wire W is continuously tensed, so that the anchor disassembling tensile wire W is siidably separated from the anchor disassembling tensile wire engaging com 20. Therefore, the anchor disassembling tensile wire W is separated from the anchor disassembling tensile wire engaging corn 20 and the corn compressing ring 27. In this state, when the remaining anchor disassembling tensile wire W is tensed, as shown in Figures 6 and 7, the anchor tensile wire engaging corns 20' are engaged with the outer through hole 12 of the cylinder 10. At this time, the tensing operation is continuously performed, so that the tensile wires W and W are pulled out of the anchor holes.

Another embodiment of the present invention will be explained in more detail with reference to the accompanying drawings.

Figures 12 through 17 are views illustrating a removable ground anchorage and a method for disassembling tensile wires according to another embodiment of the present invention, of which Figure 12 is an exploded perspective view illustrating an anchorage according to the present invention, Figure 13A is a cross-sectional view illustrating the construction that an anchorage is assembled according to the present invention, and Figure 13B is a cross-sectional view illustrating a tensile wire engaging member for an anchorage disassembling operation according to the present invention, Figures 14 through 16 are cross-sectional views illustrating a disassembling operation of an anchorage according to the present invention, and Figure 17 is a cross- sectional view illustrating another embodiment of an anchorage according to the present invention.

In this embodiment of the present invention, as shown in Figures 12 and 13, the anchor disassembling tensile wire engaging ring 31 forming the anchor disassembling tensile wire engaging member 30 is inserted into the center hole 11 of the cylinder 10. The disassembling tensile wire W is inserted into the center hole 31a of the anchor disassembling tensile wire engaging ring 31. The anchor tensile wire engaging com 20' is radially inserted into the outer through hole 12, and the spacer 35 is inserted thereinto for preventing any movements of the anchor disassembling tensile wire engaging ring 31 and the anchor tensile wire engaging corn 20'.

The anchor disassembling tensile wire engaging ring 31 has an outer diameter greater than the inner diameter of the engaging shoulder 11 b, so that the same is inserted into the center through hole 11 of the cylinder 10 and is engaged by the engaging shoulder 11b. The inner diameter of the anchor tensile engaging ring 31 is smaller than the inner diameter of the engaging shoulder 11 b, so that the anchor disassembling tensile wire engaging ring 31 is inwardly protruded from the inner surface of the engaging shoulder 11b. The lengthy of the protruded portion may be varied. In addition, as shown in Figure 13a, the outer surface of the anchor disassembling tensile wire engaging ring 31 may have different diameters at their upper and lower portions. As shown in Figure 17, the same may have the same diameters at their upper and lower portions. In another embodiment, the anchor disassembling tensile wire engaging ring 31 may have their upper and lower portions which are increased from the upper portion to the lower portion.

The anchor disassembling tensile wire engaging ring 31 may be formed of a known strong grip, etc. The disassembling tensile wire W is engaged by strongly compressing the engaging ring 31 with respect to the disassembling tensile wire W. At this time, the engaging ring 31 may engage the disassembling tensile wire W using a spirally shaped inner surface. In addition, the dissembling tensile wire W may be engaged by inserting a spirally formed cylindrical insert 32 or various types if friction members 33 such as a spring, etc. having a sharp surface between the engaging ring 31 and the disassembling tensile wire W. The anchor disassembling tensile wire engaging ring 31 is designed to have a certain engaging force. For example, the disassembling tensile wire may not be considered when designing the system in the case that a certain weight is applied to the system. The anchor disassembling tensile wire engaging ring 31 may be formed in one circular tube or may be formed of a circular tube which is split into multiple portions or may be formed of multiple portions which are split into more than two portions. When splitting the anchor disassembling tensile wire engaging ring 31 into multiple portions, it is possible to change fabrication, assembling and disassembling operations and the engaging force.

In addition, the anchor disassembling tensile wire engaging ring 31 may be formed by splitting one circular tube into more than two portions. In this case, one of the upper, intermediate and lower portions may have a certain thickness.

The lower cover 41 is engaged to the lower surface 13a of the cylinder 10. The stop shoulder 41 a is formed at the upper center portion of the lower cover 41 for separating the disassembling tensile wire W from the anchor disassembling tensile wire engaging ring 31. Figure 17 illustrates another embodiment of the anchorage according to the present invention in which the upper portion except for the lower portion of the anchor disassembling tensile wire engaging ring 31 inserted into the center through hole 11 of the cylinder 10 is tapered.

In this embodiment, when removing the tensile wires W and W after the underground structure of a high tall building, subway, etc. is constructed, the disassembling tensile wire W engaged to the anchor disassembling tensile wire engaging ring 31 is strongly pulled using the tensing machine. Therefore, as shown in Figures 14 and 15, the engaging shoulder 11b formed at the center through hole 11 of the cylinder 10 is broken by a strong pressure of the anchor disassembling tensile wire engaging ring 31 , so that the anchor disassembling tensile wire engaging ring 31 and the disassembling tensile wire W engaged thereto are separated from their positions. At this time, the anchor disassembling tensile wire engaging ring 31 supported by the anchor tensile wire engaging com 20' is separated, so that the spacers 35 which contact with the outer surfaces of the anchor disassembling tensile wire engaging ring 31 are leaned to one side for thereby implementing an unstable state of the structure.

In addition, as shown in Figure 15, when the anchor disassembling tensile wire engaging ring 31 contacts with the upper portion of the stop shoulder 41a, the anchor disassembling tensile wire engaging ring 31 does not advance. In this state, when continuously tensing the disassembling tensile wire W, the disassembling tensile wire W is slidably separated^'from the anchor disassembling tensile wire engaging ring 31 , so that the disassembling tensile wire W is fully separated from the anchor disassembling tensile wire engaging ring 31. In addition, when tensing the tensile wire W, as shown in figure 16, the anchor tensile wire engaging corns 20' are engaged by the separation engaging wall 14 of the cylinder 10. Therefore, the tensile wires W and W are fully pulled out of the anchor holes by continuously tensing. As described above, in the removable anchorage according to the present invention, an assembling operation is easy, and it is possible to fully remove the tensile wires by disassembling the engaging corns irrespective of the mortar after the structure is assembled, and it is possible to increase a stability by an accurate tensile force. During the tensile wire disassembling process, the engaging shoulder which supports the engaging member is broken due to the ejecting force of the anchor disassembling tensile wire. Since the tensile wires are removed by a simple operation that the tensile wire is separated from the anchor disassembling tensile wire engaging com after the anchor disassembling tensile wire engaging corn contacts with the corn stop member, the work process is simple, and the work time is significantly decreased. In addition, it is possible to separate the tensile wire with a very small ejecting force comparing to the conventional art in which the engaging members are broken and then the tensile wires are separated, and the ejecting apparatus is simple. When disassembling the tensile wires, since the tensile wires are not quickly disassembled but are slowly disassembled from the engaging corn and engaging ring, it is possible to prevent any accidents. The shape of the engaging member is simple, and it is easy to fabricate the same. The diameter of the cylinder may be decreased using a cylindrical anchor disassembling tensile wire engaging ring and the small sized cylindrical anchor disassembling tensile wire engaging ring, so that it is possible to decrease the fabrication cost and to increase the work performance.

Although the preferred embodiment of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as recited in the accompanying claims.

Claims

1. A removable ground anchorage, comprising: a cylinder in which a separation engaging wall is formed at its inner upper portion, a center through hole is formed at a lower portion of the upper side separation engaging wall at the center portion of the body, and a plurality of radially formed outer through holes formed around the separation engaging wall; a corn compressing ring inserted into an upper portion of the center through hole of the cylinder and having a tapered insertion portion formed at an inner upper side of the same; an anchor disassembling tensile wire engaging corn inserted into the insertion portion of the com compressing ring, wherein the tensile wire is inserted; a plurality of anchor tensile wire engaging corns inserted into an upper portion of the outer through hole for engaging the tensile wires; a spacer inserted between the anchor disassembling tensile wire engaging corn and the anchor tensile wire engaging corn; an upper cover for preventing the anchor disassembling tensile wire engaging com and the anchor tensile wire engaging corn from being escaped; a cap for protecting the inner sides of the cylinder and preventing a penetration of the mortar; a lower cover engaged to a lower portion of the cylinder; an engaging shoulder in which the corn compressing ring is engaged to an inner upper portion of the center through hole and which is broken during a disassembling process; and a stop ring formed at an upper surface intermediate portion of the lower cover for preventing the movement of the anchor disassembling tensile wire engaging com so that the tensile wire is ejected during the disassembling process.

2. The anchorage of claim 1, wherein a reinforced body is engaged to a lower portion of the lower cover for increasing an anchor resistance force.

3. The anchorage of claim 2, wherein said reinforced body includes a hole so that a mortar inserted into an inner and outer portion of the cylindrical wall becomes integral and/or a protruded portion for increasing a friction resistance.

4. The anchorage of claim 2, wherein a planting type reinforced body is engaged to a lower portion of the cylinder.

5. A tensile wire disassembling method, comprising: an engaging shoulder breaking step in which a corn compressing ring of an anchor disassembling tensile wire engaging member exceeds a pressure which is generated by the anchor tensile wire engaging com by an ejecting force of the anchor disassembling tensile wire during a tensile wire disassembling process for thereby breaking the engaging shoulder; and a step in which the anchor disassembling tensile wire engaging corn of the escaped anchor disassembling tensile wire engaging member contacts with the stop ring of the lower cover for thereby preventing a movement and the tensile wires are separated from the anchor disassembling tensile wire engaging com.

6. A removable ground anchorage, comprising: a cylinder in which a separation engaging wall is formed at its inner upper portion, a center through hole is formed at a lower portion of the upper side separation engaging wall at the center portion of the body, and a plurality of radially formed outer through holes formed around the separation engaging wall; a cylindrical anchor disassembling tensile wire engaging ring inserted into an upper portion of a center through hole of the cylinder and having a friction member at an inner surface for engaging the disassembling tensile wire; a plurality of anchor tensile wire engaging corns inserted into an upper portion of the outer through hole for engaging the tensile wires; a lower cover engaged to a lower portion of the cylinder and having a stop shoulder formed at a center portion for preventing movement of the engaging ring; an engaging shoulder fixed so that the anchor disassembling tensile wire engaging ring is engaged at an inner surface upper portion of the center through hole and broken during the disassembling process; a spacer inserted between the anchor disassembling tensile wire engaging ring and the anchor tensile wire engaging corn; an upper cover for preventing the anchor disassembling tensile wire engaging ring and the anchor tensile wire engaging corn; and a cap for protecting the inner portions of the cylinder and preventing a penetration of water or mortar.

7. The anchorage of claim 6, wherein said anchor disassembling tensile wire engaging ring is formed of a cylindrical ring, and the friction member is formed of a protruded insert inserted into the interior of the engaging ring and is one of the coil springs having a sha╧å ╬▒oss section inserted into the inner portion of the engaging ring.

8. The anchorage of claim 6, wherein said anchor disassembling tensile wire engaging ring is formed of more than two split members.

9. The anchorage of claim 6, wherein said anchor disassembling tensile wire engaging ring is formed by splitting one circular tube into more than two portions, namely, an upper portion, an intermediate portion and a lower portion, one of which having a certain thickness.

10. A tensile wire disassembling method, comprising: an engaging shoulder breaking step in which an engaging ring of an anchor disassembling tensile wire engaging member exceeds a pressure which is generated by the anchor tensile wire engaging corn by an ejecting force of the anchor disassembling tensile wire during a tensile wire disassembling process for thereby breaking the engaging shoulder; and a step in which the engaging ring of the escaped anchor disassembling tensile wire engaging member contacts with the stop ring of the lower cover for thereby preventing a movement and the tensile wires are separated from the anchor disassembling tensile wire engaging ring.