GB2206613A - Recoverable ground anchor - Google Patents
Recoverable ground anchor Download PDFInfo
- Publication number
- GB2206613A GB2206613A GB08716062A GB8716062A GB2206613A GB 2206613 A GB2206613 A GB 2206613A GB 08716062 A GB08716062 A GB 08716062A GB 8716062 A GB8716062 A GB 8716062A GB 2206613 A GB2206613 A GB 2206613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- joint
- earth anchor
- engaging
- ground surface
- controlling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
Abstract
Enlargement or friction earth anchor incorporates means 100 for separating the tension members 7 from the lower part of the anchor. The separating means (Fig. 4) is actuated by control cable 6 which acts to shear safety pin 50 and move pin 30 sufficiently to allow inward movement of balls 40, thus releasing the two parts (10 and 20) of the separating means. <IMAGE>
Description
RECOVERABLE EARTH ANCHOR
This invention relates to the construction of a recoverable earth anchor and the recovering- method thereof.
As is well known, an earth anchor is used for fastening a wall toward its back-up earth to prevent the wall from collapsing. Earth anchors can be classified into two categories, i.e. permanent type and temporary type, depending on whether or not they to be used in a permanent manner. On the other hand, anchors can be classified into another two categories, i.e. enlargement type and friction type, in accordance with the shapes of the ends of the earth anchors that penetrate into the ground, and the principle of fastening employed. The enlargement type earth anchor has a particularly enlarged block formed at the end thereof which penetrates the ground and is fitted into an enlarged cavity provided in the ground.The movement of the enlarged block at the underground end of the earth anchor is stopped by the wall of its receiving cavity and thereby a fastening force is produced at the other end of the earth anchor on the ground surface. As for the friction type earth anchor, an elongated and generally cylindrical block is formed at the end which penetrates, the ground. The diameter of the cylindrical block in this type of earth anchor is only slightly larger than that of the remaining portion , and thus the fastening force thereof with respect to the wall to be fastened is produced by the friction force between the cylindrical block and its receiving cavity.
However, a troublesome problem exists in the use of conventional earth anchor which still remains to be solved. Namely, hitherto, earth anchors, both permanent and temporary, cannot be recovered even when they are no longer necessary. Consequently, the prestressed strands of the earth anchors which remain in the ground will cause problems by affecting subsequent construction on adjacent sites.
The primary object of this invention is to completely eliminate the aforesaid disadvantage of conventional earth anchors by providing a recoverable earth anchor.
A second object of this invention is to provide a friction type earth anchor of which the cylindrical block ( fixed portion), when the earth anchor is of no further use, can be broken into several short segments under the action of impacting force produced by, for example, a pile driving operation on adjacent sites. Besides, the portion ( free portion) of the earth anchor which is closer to the ground surface than the fixed portion can be recovered to the ground. Thus, the undesired effect due to the existence of used earth anchors on adjacent construction sites can be minimized.
This invention will be further described, by way of example, with reference to the accompanying drawings, wherein:
Fig. 1 is a schematic drawing showing how the existence of prestressed strands of used earth anchors in the ground will adversely affect the construction on adjacent sites;
Fig. 2 is a schematic drawing showing how an enlargement type earth anchor in accordance with this invention is set into the earth;
Fig. 3 is a schematic drawing showing how a friction type earth anchor in accordance with this invention is set into the earth;
Fig. 4 is a sectional view of a joint of type one used for disengageably connecting the prestressed strands in an earth anchor in accordance with this invention, the joint being shown in an " engaged " state;
Fig. 5 is a sectional view similar to Fig. 4, but with the joint shown in a "disengaged" state;;
Fig. 6 is an exploded perspective view of a joint of type one as shown in Figs. 4 and 5;
Fig. 7 is a sectional view of a joint of type two used for disengageably connecting the prestressed strands in a friction type earth anchor in accordance with this invention, the joint being shown in an " engaged " state;
Fig. 8 is a sectional view similar to Fig. 7, but with the joint shown in a " disengaged " state;
Fig. 9 is an exploded perspective view of the joint of type two as shown in Figs. 7 and 8;
Fig. 10 is a sectional view illustrating several aforesaid joints of type two connected in series and used in a friction type earth anchor in accordance with this invention, all joints being shown in an "engaged" state; and
Fig. 11 is a sectional view similar to Fig. 10, but with all joints shown in a "disengaged" state.
The aforementioned problem of conventional earth anchor will now be further described by referring to
Fig. 1. Hitherto, earth anchors used for fastening and securing sheet piles 8 etc. against the back-up earth during construction on a site, say site 2, are usually left in the earth of adjacent sites, say sites 1 and 3, even when the construction is finished and the earth anchors are of no further use. The prestressed strands of these residual earth anchors are left in the earth of the adjacent lands at the spacing therebetween of about 1 meter along the horizontal direction, and about 1-2 meters along the vertical direction. Thus, these prestressed strands which are quite tough are distributed at such a high density that they will seriously affect subsequent construction on adjacent sites.
This invention provides a solution to completely overcome the aforesaid drawback of conventional earth anchors.
The way an enlargement type earth anchor in accordance with this invention is set into the earth is schematically shown in Fig. 2, wherein the prestressed strands 7(7') of each earth anchor are longitudinally divided into a free section 4 and a fixed section 5 connected with a joint 100 of type one therebetween, with the free section 4 being closer to and accesible from the ground surface, and the fixed section 5 penetrating the ground. Thus, when the earth anchor is no longer necessary, a controlling cable 6 , of which one end is connected to the joint 100 and the other end is introduced outside the ground surface G.L. , can be pulled from the ground surface to move the joint 100 into a "disengaged" state, the details of which will be described below, and thereby the free section 5 can be recovered from the ground surface.
The way a friction type earth anchor in accordance with this invention is set into the earth is schematically shown in Fig. 3. The prestressed strands of this friction type earth anchor also comprise a free section 4 and a fixed section 5' connected with a joint of type two, outermost joint, therebetween. The structure of the free section 4 in this type of earth anchor is the same as that of the above enlargement type earth anchor, but the fixed section 5' in this type of earth anchor is about 20 meters or so in length and is connected along its length with several joints (inner joints ), including one joint 100 of type one at the innermost side and several joints 200 of type two.When the earth anchor is no longer necessary, a controlling cable 6 similar to that shown in Fig. 2 and used in the aforementioned enlargement type earth anchor can be operated fr-om the ground surface to disengage each of the joints one by one. Thus, not only can the free section 4 be retrieved from the ground surface but the fixed section ' can also be broken into short several segments at the joints when impacting forces from pile driving operations are exerted thereon. Accordingly, the drawback of conventional earth anchors can be completely overcome.
The details of the structure and the action of the first type of joint 100 will now be described with reference to Figs. 4 through 6.
Fig.4 is the assembly drawing of a joint 100 of type one, showing the joint 100 in an "engaged" state, i.e. a state wherein the free section 4 and the fixed section 5 can be connected or coupled by this joint 100. Fig. 5 is similar to Fig. 4 , but showing the joint 100 in a "disengaged" state, i.e. a state wherein the connection between the free section 4-and the fixed section 5 by the joint 100 is disconnected. Fig. 6 is the exploded sectional view of the joint 100.
From the above three drawings, it can be understood that joint 100 mainly comprises a first member 10, a second member 20, an engaging pin 30, several balls 40, a safety pin 50, and a protecting bellow 60 etc.
Referring, in particular, to Fig. 6, the first member 10 comprises a sleeve portion 11 and a flange portion 12. The sleeve portion 11 is provided at its center a receiving hole 13 which opens from the side far from the flange portion 12 and extends in axial direction but does not penetrate through the whole member 10, and a groove 16, the depth of which is smaller than the radius of the ball 40, is recessed into the inner periphery of the hole 13. A plurality of through holes 15 for passing through the prestressed strands 7' together with the same number of securing portions 14 for securing the ends of the strands 7' are circumferentially provided on the flange portion 12, each through hole 15 extending parallel to the axial direction of the joint 100 and aligned with a securing portion 14.
The second member 20 comprises a substantially hollow cylindrical body 23, an enlarged portion 21 intergral with the body 23, and a flange portion 22 which is also intergrally formed with the body 23. A guiding hole 28 having constant cross section is axially provided at the central portion of the second member 20. The hole 28 penetrates almost the whole length of the second member 20 then reduces to a relatively small hole 29A at a position near the end surface of the second member 20 on the flange portion side. The small hole 29A extends from the guiding hole 28 through a projection 29 which projects slightly from the aforsaid end surface . The outer size of the body portion 23 is so determined that it can be slidably fitted into the receiving hole 13 in the first member 10.Several ball holes 26 which penetrate radially through the wall of the hollow body portion 23 are circumferentially disposed at appropriate positions in the body portion 23. Besides, a safety pin hole 27 is radially provided in the body portion 23 for receiving the safety pin 50. The outer diameter or size of the enlarged portion 21 is substantially the same as that of the sleeve portion 11 of the first member 10. On the flange portion 22 of the second member 20 are also provided several through holes 25 and securing portions 24 which are indentical, in the number and the function thereof, to the above through holes 15 and securing portions 14 on the flange portion 12 of the first member 10.
As shown in Fig. 6, the engaging pin 30 comprises a sliding portion 38, and a pressing portion 36 integrally formed with the sliding portion 38. The sliding portion 38 is provided with a satefy pin hole 37 which radially extends through the sliding portion 38, and a securing portion 34 formed at the end surface of the portion 38 far from the pressing portion 36. The pressing portion 36 includes, at the end far from the sliding portion 38 , a convergent portion 35 of which the radial size gradually reduces toward the end. The outer dimension or diameter of the sliding portion 38 is so determined that it can be slidably fitted into the c guiding hole 28 of the second member 20. The pressing portion 36 is smaller in outer diameter or size than that of the sliding portion 38.
The engaging and disengaging function of this joint 100 will now be described in detail by referring to
Figs.4 and 5, which show the engaged and disengaged states respectively of the joint 100 of type one.
As shown in Fig. 4, when joint 100 is in the engaged state, the engaging pin 30 is inserted fully into the guiding hole 28 of the second member 20 and the body portion 23 of the member 20 is inserted into the receiving hole 13 of the first member 10 to the point where the ball holes 26 provided therein are alligned with the groove 16 recessed on the inner periphery of the receiving hole 13 of the first member 10. Also, the engaging pin 30 is so positioned that the safety pin hole 37 provided therein is aligned with the safety pin hole 27 provided in the body portion of the second member 20.
In addition, each of the balls 40 is received in a ball hole 26 of the member 20 and firmly pressed against the groove 16 of the member 10 by the pressing portion 36 of the engaging pin 30 at the bottom thereof. A controlling cable 6 is secured to the securing portion 34 of the engaging pin 30 before the Latter is inserted into the guiding hole 28, and is inserted through the small hole 29a outside of the member 20 and extends up to the ground surface so that it can be operated from the ground surface. Further, a safety pin 50 is inserted into and through the aligned safety pin holes 17 and 27 so as to guarantee that the engaging pin 30 will not be unintentionally or mistakenly moved away from this engaged state.In order to avoid the intrusion of dirt, debris, water etc. into the joint 100, a protecting bellow 60 is provided around the connecting portions with the two longitudinal edges of the bellow 60 being sealingly adhered to the sleeve portion 11 of the first member 10 and the enlarged portion 21 of the second member 20 respectively. Also, for same purpose, a protecting bag 70 is wrapped around the whole length of the controlling cable 6 except for the portion inside of the member 20, with one end of the bag 70 being attached and sealed to the projection 29 of the member 20. Each of the prestressed strands 7 or 7' to be connected by the joint 100 is introduced respectively through a through hole 15 or 25, and secured to a securing portion 14 or 24.Thus, the prestressed strands of the earth anchor are connected by the joint 100 which is in an engaged state, wherein the relative motion between the engaging pin 30 and the second member 20 is stopped by the safety pin 50 and the relative motion between the first and second members 10 and 20 is stopped by the several balls 40 engaged at their shearing surface.
In Fig. 5, the disengaged state of the joint 100 is shown. When the earth anchor is no longer necessary, the controlling cable 6 is pulled from the ground surface by a pulling force which is strong enough to overcome the shearing strength of the safety pin 50. Hence, the safety pin 50 will be broken and the engaging pin 30 be moved away from the engaged state as shown in Fig. 4 to the disengaged state as shown in Fig. 5 wherein the pressing portion 36 of the engaging pin 30 no longer pressed against the bottom of each ball 40 and thus the balls 40 move away from the shearing surface between the first member 10 and the second member 20. Accordingly, in ths aforesaid disengaged state, the prestressed strands 7 and 7' secured on the opposite two sides of the joint 100 can be disconnected.
In the friction type earth anchor as shown in Fig.
3, in order to connect the prestressed strands thereof, several joints in series are used, of which only the joint farthermost from the free section is a joint 100 of type one, and the remaining joints are all joints 200 of type two.
The details of the structure and of action of the second type of joint 200 will be described below with reference to Figs. 7 to 9.
Fig. 7 is an assembly drawing of the second type of joint 200, showing the joint 200 in an "engaged" state.
Fig. 8 is similar to Fig. 7 , but showing the joint 200 in a "disengaged" state. Fig. 9 is the exploded sectional view of the joint 200.
From the above three drawings, it can be understood that the joint 200 of type two, which mainly comprises a first member 10', a second member 20, an engaging pin 30', several balls 40, a safety pin 50, and a protecting bellow 60, is quite similar in its structure to the first type of joint 100 described above. However, in the case of the joint 200 of type two, securing portions 33 and 34 are provided at both longitudinal ends of the engaging pin 30', instead of only at one end thereof. Besides, in the first member 10' of the joint 200, a small through hole 19A is opened from the central portion at the bottom of the hole 13 and extends in axial direction to again open at a small projection 19 which projects slightly from the end surface on the flange portion side.In an assembled state, as shown in Fig. 7 or 8, a controlling cable 6' which is connected at one end to the securing portion 33 of the engaging pin 30' is introduced through the hole 19A to the outside of the first member 10' for connecting the securing portion 34 of the engaging pin 30' in the next joint ( see also Figs. 10 and 11). A protecting bag 70' which is similar to the protecting bag 70 described above is also wrapped around the portion of the controlling cable 6' between two adjacent joints, with the two ends of the bag 70' being attached and sealed to the projections 29 and 29' respectively provided on the two joints.In this way, several such joints which are connected in series as, for example, in the case of a friction type earth anchor, can be controlled simultaneously by pulling only one controlling cable 6 which is connected at one end to the securing portion 34 of the engaging pin 30' in the outermost joint 200 and introduced at the other end to the ground surface (see also Figs. 3, 10 and 11). In Figs. 10 and 11, three joints 200 which are connected in series are shown in an engaged and disengaged states respectively. As illustrated in Fig. 10, a spring element 6A with appropriate spring constant is interposed in each controlling cable to prevent a premature transfer to a disengaged state due to unintentional or erroneous operation.When the outermost controlling cable 6 is pulled with a force capable of overcoming the shearing strength of the safety pin 50, the outermost joint 200 will be transferred to the disengaged state first as described above, then the followed joints will be transferred to the disengaged state one after another under the pulling action of the controlling cables connected between each pair of adjacent joints. Under this situation, wherein all of the joints are in a disengaged state, the free section of the friction type earth anchor can be recovered from the ground surface and the fixed section thereof can thereafter be broken at the disengaged joints into several short segments under the action of impacting force produced in a pile driving operation etc. Accordingly, the drawback of conventional earth anchors as described above can be solved by this invention.
Although reference is made throughout this specification to recoverable earth anchors, it will be appreciated that, in some of the embodiments of the present invention, part of the earth anchor will remain in the ground after the remainder has been recovered, and that, in others, that part of the earth anchor which remains in the ground may be broken up into several smaller parts. In all such latter embodiments that part of the earth anchor which remains in the ground need cause no significant disruption to subsequent construction work.
Claims (11)
1. A recoverable enlargement type earth anchor comprising a plurality of prestressed strands longitudinally divided into a fixed section which penetrates the earth and a free section which is closer to the ground surface than the fixed section, and a joint connected between the two sections, the joint comprising:
a first member connected to one end of the fixed section of the strands;
a second member connected to one end of the free section of the strands;
engaging means for disengageably engaging the first and second members;
controlling means for controlling the engaging means from the ground surface so as to release the engagement between the first and second members when necessary; and
safety means for preventing the premature disengagement of the first and the second members due to unintentional operation of the controlling means.
2. An enlargement type earth anchor as described in claim 1, wherein
the engaging means includes an engaging pin and at least one ball disengageably moved by the engaging pin;
the controlling means is a controlling cable introduced from the ground surface to the joint and secured to the engaging pin of the joint;
the safety means is a safety pin;
the first member includes a sleeve portion and an integrally formed first flange, the sleeve portion being provided at its center with a receiving hole which opens from the end surface of the sleeve portion far from the first flange and extends in axial direction but does not penetrate the first member, the inner periphery of the receiving hole being provided thereon with a groove, the depth of which being smaller than the radius of the ball;;
the second member includes a substantially hollow cylindrically body, an enlarged portion integral with the body, and a second flange also integral with the body; the second member being provided at the central portion thereof a guiding hole which penetrates almost the whole length of the second member and then reduces to a relatively small through hole penetrating at a position near the end surface of the second member on the flange side; the outer size of the hollow body being so determined that it can be slidably fitted into the receiving hole in the first member; the hollow body being provided with several ball holes which are disposed circumferentially along and penetrate radially through the wall of the hollow body, and with a satefy pin hole which is radially provided in the hollow body for receiving the safety pin; the oer size of the enlarged portion being substantially the same as that of the sleeve portion of the first member;
the engaging pin includes a sliding portion and a pressing portion integrally formed with the sliding portion; the outer size of the sliding portion being so determined that it can be slidably fitted into the guiding hole of the second member; the outer size of the pressing portion being smaller than that of the sliding portion; the sliding portion being provided therein with a safety pin hole radially extending through the sliding portion; and wherein:
the one end of the the fixed section of the prestressed strands is connected to the first flange of the first member, and the one end of the free section of the prestressed strands is connected to the second flange of the second member.
3. A recoverable friction type earth anchor, comprising a plurality of prestressed strands longitudinally divided into a fixed section which penetrates the earth and a free section which is closer to the ground surface than the fixed section, and an outermost joint interconnected between the free section and the fixed section; the fixed section comprising a plurality of collinear segments, and a plurality of inner joints each being connected between a pair of adjacent segments, all the joints inclusive of the outermost one and the inner ones being connected in series, and each joint comprising:
a first member secured to one end of one of each pair of adjacent segments of the strands to be connected;
a second member secured to one end of the other c
each pair of adjacent segments to be connected;
engaging means for engaging the first and second
members in a disengageable manner;
controlling means for controlling the engaging means
from the ground surface so as to release the engagement
between the first and second members when necessary; and
safety means for preventing the premature
disengagement of the first and the second members due to
unintentional operation of the controlling means.
4. A recoverable friction type earth anchor as
described in claim 3, wherein, in each one of the joints
including the outermost one and the inner ones:
the engaging means includes an engaging pin and at
least one ball disengageably moved by the engaging pin;
the safety means is a safety pin;
the first member includes a sleeve portion and an
integrally formed first flange, the sleeve portion being
provided at its center with a receiving hole which opens from the end surface of the sleeve portion far from the
first flange and extends in axial direction, the inner
periphery of the receiving hole being provided thereon
with a groove, the depth of which is smaller than the
radius of the ball;;
the second member includes a subsantially hollow
cylindrically body, an enlarged portion integral with the
body, and a second flange also integral with the body;
the second member being provided at the central portion thereof a guiding hole which penetrates almost the whole length of the second member and then reduces to a relatively small through hole penetrating at a position near the end surface of the second member on the flange side; the outer size of the hollow body being so determined that it can be slidably fitted into the receiving hole in the first member; the hollow body being provided with several ball holes which are disposed circumferentially along and penetrate radially through the wall of the hollow body, and with a satefy pin hole which is radially provided in the hollow body for receiving the safety pin; the outer size of the enlarged portion being substantially the same as that of the sleeve portion of the first member;
the engaging pin includes a sliding portion and a pressing portion integrally formed with the sliding portion; the outer size of the sliding portion being so determined that it can be slidably fitted into the guiding hole of the second member; the outer size of the pressing portion being smaller than that of the sliding portion; the sliding portion being provided therein with a safety pin hole radially extending through the sliding portion;
wherein:
the one end of one of each pair of adjacent segments of the strands to be connected is secured to the first flange of the first member, and the one end of the other
of same pair of adjacent segments is secured to the
second flange of the second member in the same joint;
and wherein:
the controlling means comprises an outermost
controlling cable introduced from the ground surface to
the outermost joint and secured to one end of the
engaging pin of the outermost joint, and a plurality of
intermediate controlling cables each secured at the two
ends thereof, respectively, to one end of the engaging
pin in one of a pair of adjacent joints.
5. A method for recovering the earth anchor as
described in claim 1, comprising the steps of operating
the controlling means from the ground surface for
controlling the engaging means to release engagement
between the first and second members so as to actuate the
joint into a disengaged state; and withdrawing the free
section of the prestressed strands of the earth anchor
from the ground surface.
6. A method for recovering the earth anchor as described in claim 2, comprising the steps of operating
the controlling means from the ground surface for
controlling the engaging means to release engagement
between the first and second members of each joint so as
to actuate each joint into a disengaged state; and
withdrawing the free section of the prgstressed strands
of the earth anchor from the ground surface.
7. A method for recovering the earth anchor as
described in claim 3, comprising the steps of pulling the controlling cable from the ground surface to overcome the shearing strength of the safety pin so as to move the engaging pin and consequently the balls out of the engaged state; and withdrawing the free section of the prestressed strands of the earth anchor from the ground surface.
8. A method for recovering the earth anchor as described in claim 4, comprising the steps of by pulling the outermost controlling cable from the ground surface to overcome the shearing strength of the safety pin in each joint so as to move the engaging pin and consequently the balls in each joint out of the engaged state; and withdrawing the free section of the prestressed strands of the earth anchor from the ground surface.
9. An enlargement type earth anchor as hereinbefore described with reference to Figs. 2, 4, 5 and 6.
10. A friction type earth anchor as hereinbefore described with reference to Figs. 3 to 11.
11. A partially recoverable earth anchor comprising:
a plurality of elongate elements longitudinally divided into a first longitudinal part which, in use, is significantly underground, and a second longitudinal part which, in use, is closer to the surface of the ground than the first longitudinal part;
a first joint member connected to the proximal end region of the first longitudinal part;
a second joint member connected to the distal end region of the second longitudinal part;
engagement means capable of engaging the first and second members to effect a joint;
control means capable of remotely controlling the engagement means so as to release the engagement between the first and second joint members when necessary; and
safety means for preventing accidental disengagement of the first and second joint members as a result of unintentional operation of the control means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08716062A GB2206613A (en) | 1987-07-08 | 1987-07-08 | Recoverable ground anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08716062A GB2206613A (en) | 1987-07-08 | 1987-07-08 | Recoverable ground anchor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8716062D0 GB8716062D0 (en) | 1987-08-12 |
| GB2206613A true GB2206613A (en) | 1989-01-11 |
Family
ID=10620304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08716062A Withdrawn GB2206613A (en) | 1987-07-08 | 1987-07-08 | Recoverable ground anchor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2206613A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2277773A (en) * | 1993-04-26 | 1994-11-09 | Avibank Mfg Inc | Plug locking assembly |
| CN102776881A (en) * | 2012-08-13 | 2012-11-14 | 杭州南联地基基础工程有限公司 | Recyclable post-tensioned prestressing anchor cable pile and construction method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944160B (en) * | 2021-10-26 | 2022-08-09 | 中国矿业大学(北京) | Anchor assembly capable of recycling anchor cable and mounting, locking and recycling methods thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB554634A (en) * | 1942-01-28 | 1943-07-13 | Aviat Developments Ltd | Improvements relating to coupling pins or shafts |
| GB555040A (en) * | 1941-07-10 | 1943-07-30 | Aviat Developments Ltd | Improvements in coupling or engaging devices |
| GB894471A (en) * | 1959-09-01 | 1962-04-26 | Nuclear Power Plant Co Ltd | Self engaging couplings |
| GB1494247A (en) * | 1974-06-19 | 1977-12-07 | Losinger Ag | Method and means of extracting a prestressed steel tendon anchor |
| GB2148968A (en) * | 1983-11-05 | 1985-06-05 | Hsi Huan Lu | Recoverable ground anchor |
| GB2158482A (en) * | 1984-03-19 | 1985-11-13 | Dyckerhoff & Widmann Ag | Device for separating the tension member of a prestressed pressure-grouted anchor by forming a predetermined breaking point |
-
1987
- 1987-07-08 GB GB08716062A patent/GB2206613A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB555040A (en) * | 1941-07-10 | 1943-07-30 | Aviat Developments Ltd | Improvements in coupling or engaging devices |
| GB569900A (en) * | 1941-07-10 | 1945-06-13 | Reginald Arthur William Spoone | Improvements relating to coupling or connecting devices |
| GB554634A (en) * | 1942-01-28 | 1943-07-13 | Aviat Developments Ltd | Improvements relating to coupling pins or shafts |
| GB894471A (en) * | 1959-09-01 | 1962-04-26 | Nuclear Power Plant Co Ltd | Self engaging couplings |
| GB1494247A (en) * | 1974-06-19 | 1977-12-07 | Losinger Ag | Method and means of extracting a prestressed steel tendon anchor |
| GB2148968A (en) * | 1983-11-05 | 1985-06-05 | Hsi Huan Lu | Recoverable ground anchor |
| GB2158482A (en) * | 1984-03-19 | 1985-11-13 | Dyckerhoff & Widmann Ag | Device for separating the tension member of a prestressed pressure-grouted anchor by forming a predetermined breaking point |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2277773A (en) * | 1993-04-26 | 1994-11-09 | Avibank Mfg Inc | Plug locking assembly |
| GB2277773B (en) * | 1993-04-26 | 1996-03-20 | Avibank Mfg Inc | Plug locking assembly |
| CN102776881A (en) * | 2012-08-13 | 2012-11-14 | 杭州南联地基基础工程有限公司 | Recyclable post-tensioned prestressing anchor cable pile and construction method thereof |
| CN102776881B (en) * | 2012-08-13 | 2015-02-25 | 杭州南联地基基础工程有限公司 | Recyclable post-tensioned prestressing anchor cable pile and construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8716062D0 (en) | 1987-08-12 |
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