JP2009280959A - Anchor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor structure which can increase the bearing capacity of an anchor by making a filler properly infiltrated and diffused into a water-permeable stratum section of ground and enabling the sure construction of an underground anchoring section spreading over a range wider than a diameter of a drilled hole. <P>SOLUTION: A discharge opening portion 17 for the filler 12 in an anchor underground section is set based on a position of a known water-permeable stratum 61. When a bag-like body 14 is expanded with the filler 12, the filler 12 partially flows out of the discharge opening portion 17, and permeates for diffusion through the water-permeable stratum 61 section. Since a consolidated section 18 formed by the hardening of the spread filler 12 serves as the underground anchoring section 50 of the anchor together with the bag-like body 14 portion, the consolidated section 18 can utilize the bearing capacity of the ground 60; the bearing capacity of the anchor can be increased by remarkably increasing pulling resistance to the ground 60; and the bearing capacity suitable for a purpose can be surely obtained because the size of the consolidated section 18 can be easily adjusted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an anchor structure centering on an underground portion among ground anchors used for prevention of landslide and the like.

  Work to install ground anchors to prevent the occurrence of landslides where parts of the ground move on natural slopes, slopes or slopes created, and to support and fix the earth retaining walls provided in the ground cuts Widely used in the past.

  A ground anchor is a state in which a tensile member made of steel wire or the like is inserted into the ground and one end thereof is fixed and fixed in the ground, while the other end of the tensile member is exposed to the ground surface. The tension member is formed by fixing the exposed portion of the tension member to a concrete or steel plate pressure receiving member (anchor base) installed on the ground surface. Is transferred from the pressure receiving member to the ground side, holding the moving layer in the ground to suppress landslides, or supporting and fixing the retaining wall provided in the excavation part of the ground, causing the unexcavated ground to collapse to the excavation side It has become a mechanism to prevent.

With such a ground anchor, as one of the underground fixing parts for fixing one end of the tension member to the ground, one end of the tension member has been inserted into the interior and one end of the tube for filling the filler is in communication with the interior. After the bag body is inserted into the hole drilled in the ground together with the tension member, the bag body is filled with a hardening material such as grout at a predetermined filling pressure, and the bag body is expanded in the ground. Many cured products are used. Examples of such a conventional ground anchor structure include those described in JP-A-11-200365, JP-A-2002-180464, and JP-A-2005-273219.
JP-A-11-200365 JP 2002-180464 A JP-A-2005-273219

  The conventional ground anchor has a configuration shown in each of the above patent documents, and the bag body that is in an expanded and hardened state is in close contact with the hole wall. Especially in the case of soft ground, the bag body is larger than the initial drilling diameter. As the ground anchoring portion of the anchor spreads, a predetermined supporting force is obtained for the ground. For example, when at least a part of the ground around the anchor has appropriate water permeability, or the bag body and the hole depending on the geology Depending on the ground conditions, such as when a gap can be expected between the wall and the surrounding ground, a filler is introduced outside the bag body to ensure more reliable support. Further integration of the surrounding ground and the bag by material penetration and / or filling of the gap between the bag body and the hole wall and final hardening of the filler is desired.

  However, in the case of the example described in Patent Document 1, since the filler does not pass or flow out from the woven fabric bag body to the outer ground side, means for separately supplying the filler outside the bag Therefore, the work related to the press-fitting of the filler into the ground is complicated, and there is a problem that it takes time and cost to construct the anchor.

  On the other hand, in the examples described in Patent Documents 2 and 3, as a structure that does not prevent a part of the filler from leaking outside from the woven fabric bag body, the filler material is allowed to flow out from the outer surface of the bag body. It is designed to allow some filler to penetrate and diffuse into the ground, but it is extremely difficult to adjust and maintain the flow rate of the filler appropriately with a flexible and deformable bag. It was difficult, and in reality, the filler could not be discharged sufficiently, and on the contrary, the filler was excessively discharged.

  That is, when the outflow of the filler from the bag body into the ground is from a small gap of the normal texture in the bag body, the small gap of the texture is likely to be clogged with various components of the filler, and the bag body The flow of the filler from the ground into the ground is limited to a very short time in the initial stage of filling, and after that, most of the water leaks to the outside from the bag body, and the grout penetrates and diffuses into the surrounding ground to integrate with the bag body. However, it was difficult to actually set the cured and fixed state. In this case, the resistance force in the underground fixing part is mainly due to the friction between the surface of the bag body in the expanded state and the hole wall of the ground, and the range in which the resistance force can be generated is limited to the range of drilling. The resistance force could not be generated in a wider range than the drilled hole.

  Conversely, the bag body is partially enlarged to widen the gap, or another hole for discharging filler that is larger than the gap of the weave is provided to actively allow the filler to flow out of the outer surface of the bag. If it tried to do so, even if the bag body expanded, the outflow of the filler occurred, and there was a problem that the bag body could not be expanded appropriately. Further, in the case of Patent Documents 2 and 3, since the outflow portion (gap or hole) exists uniformly in the longitudinal direction of the bag body, the outflow of the filler material occurs in almost the entire bag body. It is extremely difficult to control the spillage, and if there is a gap such as a rift in any of the underground parts facing the bag body, it will cause excessive spillage of the filler, increasing the amount of filler used and reducing the construction cost. It had the problem of raising it.

  The present invention has been made to solve the above-mentioned problems, and by appropriately penetrating and diffusing the filler into the ground layer having the water permeability of the ground, the bag-like body is expanded together with the amount of expansion, and the diameter is determined from the hole diameter. An object of the present invention is to provide an anchor structure capable of reliably constructing an underground fixing portion over a wide range and capable of supporting the ground efficiently with one anchor by increasing the supporting force of the anchor.

  An anchor structure according to the present invention includes one or a plurality of tensile members formed of a linear body, and a bag-like body in which the tensile member is inserted and a tube for filling a filler communicates with the interior. In the state where the anchor underground portion provided is inserted to a predetermined depth position of the hole drilled in the ground, the bag-like body is filled with a fluid filler that is predeterminedly cured from the ground side via the tubular body. In the anchor structure in which the bag-like body is inflated and the filler is cured, and the inflated and hardened bag-like body portion is an underground fixing portion, the anchor underground portion of the anchor underground portion is surveyed and acquired in advance. The bag while preventing backflow from the ground side at one or a plurality of predetermined positions in the longitudinal direction corresponding to the position of the underground layer having water permeability that has become known from the ground information that has been inserted in the ground. Of the filler filled in the body A discharge port portion that allows partial outflow to the recording hole and the ground side is provided, and a predetermined amount of filler that has flowed out of the discharge port portion in a state where the bag-like body is inflated, around the discharge port portion. A consolidated portion larger than the drilling hole diameter is formed around the discharge port portion with the penetration into the water-permeable formation and the hardening.

  As described above, according to the present invention, the information obtained from the investigation result of the ground performed before the anchor construction is used, and the filler in the middle portion of the anchor is based on the position of the water-permeable formation in the known ground. If the discharge port that becomes the outflow location is set according to the position of the water-permeable formation, and the bag-like body is inflated with the filler, a part of the filler flows out from the discharge port to the outside. The filler penetrates and diffuses into the water-permeable formation located around the outlet, and the solidified part formed by curing the filler spreading beyond the drilling range is the bag-like body part. In addition, by making the anchor anchoring part of the anchor together, the supporting force of the ground can be used as a resistor part where the consolidated part spreads beyond the drilling range, the pulling resistance to the ground is remarkably increased, and the anchor supporting force is increased. To increase safety In addition, the size of the external solidified part can be easily adjusted without changing the filling state of the filling material into the bag-like body, and the bearing capacity suited to the purpose of use and the ground conditions through reasonable construction without waste Can be obtained reliably, and the cost of anchor construction is also excellent. In addition, since the pulling resistance can be increased at the consolidated part wider than the drilling range, it is possible to make the anchor part smaller than conventional anchors when handling with the same support force, handling of each part of the anchor, drilling and placing work This is also advantageous, and the overall cost of anchor construction can be reduced. In addition, there is no outflow to cracks in the ground other than the water permeable formation, the amount of filler supplied is determined by the size of the consolidated part formed outside the bag-like body part, and excessive filler Since there is no need to input the amount of filler, the amount of filler can be minimized and not only in terms of cost, but also the adverse effect on the environment around the anchor due to excessive outflow of filler can be prevented.

  In addition, the anchor structure according to the present invention has a structure in which the anchor underground portion is connected to each other via a predetermined non-inflatable connecting member by arranging a plurality of bag-like bodies in the longitudinal direction of the tensile member as necessary. The dimension of each bag-like body in the longitudinal direction of the tensile member is set so that the connecting member interposed between the bag-like bodies is located at the one or more predetermined positions.

  As described above, according to the present invention, the anchor underground portion is formed as a connection structure between the bag-like body and the connecting member, the dimension of the bag-like body is adjusted, and the connecting member between the bag-like bodies is located in the water-permeable formation. The bag-like body can be inflated by filling with a filler as it is, so that the discharge port can be reliably arranged at an appropriate position by adjusting the dimensions of the bag-like body before being integrated as an anchor underground portion. In addition, the bag-like body can be efficiently disposed in the hole, and both can be expanded and cured to form an underground fixing portion. The bag is combined with a consolidated portion formed in a water-permeable base layer portion. The support force by the body part and the consolidated part can be maximized. In addition, it is not necessary to dispose the discharge port portion on the bag-like body by positioning the discharge port portion of the filler on the connecting member that is a non-expandable portion that does not expand even when the filler is filled. It is possible to simplify the structure of the discharge port portion that allows only an appropriate amount of outflow to the ground side.

  Further, in the anchor structure according to the present invention, if necessary, the connecting member is made of a cylindrical body having a strength that does not deform with the filling pressure of the filler, and has one or more openings that can pass the filler. Perforated and arranged on a plurality of circumferential side surfaces, the end portions of the bag-like body are integrally connected to both ends in a state of surrounding the tension member and the tube body, and communicate with each other inside the bag-like body, A substantially cylindrical flexible check valve body that closes the opening so as to be openable by pressure from the inside of the connecting member is disposed so as to surround the outer periphery of the connecting member, and is opposite to the opening of the connecting member. The stop valve body is the discharge port portion.

  As described above, according to the present invention, the connecting member is formed into a cylindrical body having an opening, and the check valve body that closes the opening of the connecting member is disposed to form the discharge port, and the filling is performed. When the pressure inside the bag-shaped body and the inside of the connecting member communicating with the bag-shaped body is increased by filling the bag-shaped body with the material, the check valve body is deformed for the first time and the filling from the opening of the connecting member to the outside is performed. By allowing the material to flow out, it is possible to realize the outflow of the filler to the outside of the connecting member in a state in which the backflow is reliably prevented, and the formation has a simple structure and the underground portion has water permeability in the ground. The solidified portion can be formed by permeating into the filler, and wasteful outflow of the filler can be suppressed.

  Further, in the anchor structure according to the present invention, if necessary, a bag-like body is located at the one or more predetermined locations of the anchor underground portion, and the bag-like body and the inner tension are located at the one or more predetermined locations. A restraining member that restrains the member in a non-expanded state is provided.

  As described above, according to the present invention, the anchor underground portion is configured to position the bag-like body at a predetermined position corresponding to the water-permeable formation, and the disposition position of the restraining member that maintains the bag-like body in a non-inflated state. Can be set as the position of the discharge port as it is, even if the position and dimensions of the bag-like body cannot be easily changed, such as after the tensile member and the bag-like body that form the anchor underground part have already been assembled together. The location where the restraining member is provided corresponding to the formation position having the can be set as the discharge port portion, and the filler can be reliably sent from the discharge port portion to the formation portion having water permeability. In addition, as the non-inflatable portion that does not expand even when the filler is filled, the discharge port does not have to be disposed at the location where the bag-like body expands. Thus, it is possible to simplify the structure of the discharge port portion that allows only outflow. Furthermore, it is not necessary to adjust the size of the bag-like body in order to provide another member that forms the discharge port, and when the bag-like body is made of a high-strength material, the processing effort can be saved, and the anchor The assembly work of the underground part can be simplified, and it is not necessary to prepare a plurality of types of bag-like bodies having different dimensions, and the cost can be reduced by limiting the types of bag-like bodies.

  In addition, the anchor structure according to the present invention is formed as a substantially annular body in which the size of the restraining member is adjustable from the outside in order to restrain the bag-like body and the tension member, if necessary. is there.

  As described above, according to the present invention, the restraint member has a substantially annular structure in which the size of the inner portion surrounding the restraint member can be adjusted, and can be restrained in a state in which the size is varied depending on the object, thereby allowing the bag-like body to be restrained. Even when the shape of the internal tension member is changed in the longitudinal direction of the tension member and the restraint state when restraining the predetermined portion of the bag-like body and the tension member from the outside is different in the longitudinal direction of the tension member, the restraint member The bag-like body and the tension member can be brought into a restrained state without any problem, and the restraint position of the bag-like body can be freely adjusted in the longitudinal direction of the tension member with one kind of restraint member. It is possible to set the position of the discharge port as it is by attaching the restraining member to a predetermined location on the bag-like body corresponding to the position of the geological formation without having to prepare various restraining members in advance. Etc. can also be performed in the anchor construction site, flexibility is possible.

  In addition, the anchor structure according to the present invention is configured such that the restraining member has an opening having a size that allows the filler to pass therethrough on one or a plurality of side surfaces, as necessary. One or a plurality of through-holes that are large enough to allow the filler to pass therethrough and communicate with the opening of the restraining member are formed in the restraining member disposition portion, and the opening of the restraining member and the through-hole of the bag-like body A check valve body of a substantially cylindrical flexible body that is releasably closed by pressure from the inside of the bag-like body is disposed in a state of surrounding the opening portion portion of the restraining member and the through-hole portion of the bag-like body, The opening of the restraining member, the through hole of the bag-like body, and the check valve body are used as the discharge port portion.

  As described above, according to the present invention, the opening is formed in the restraining member, and the through-hole communicating with the opening is formed in the bag-like body, and the opening of the restraining member and the bag-like body are penetrated. When the check valve body that closes the hole is arranged to form the discharge port, and the pressure inside the bag-like body increases due to the filling of the filler into the bag-like body, the check valve body is deformed for the first time. By allowing the filler to flow out from the opening of the restraining member, it is possible to realize the outflow of the filler to the outside of the restraining member in a state in which the backflow is reliably prevented, and to ensure the filling material with a simple structure. It is possible to form a consolidated portion by infiltrating into the underground water-permeable portion of the ground, and to suppress wasteful outflow of the filler.

(First embodiment of the present invention)
A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of an anchor structure according to the present embodiment, FIG. 2 is an explanatory diagram of an underground placement state of an anchor underground portion in the anchor structure according to the present embodiment, and FIG. 3 is an anchor ground of the anchor structure according to the present embodiment. FIG. 4 is an explanatory diagram of a filling state of the anchor ground portion in the anchor structure according to the present embodiment, and FIG. 5 is a ground in the anchor structure according to the present embodiment. FIG. 7 is a diagram illustrating a completed state of the fixing unit.

  In each of the drawings, in the anchor structure according to the present embodiment, the anchor underground portion 10 including a plurality of tension members 11 and a plurality of bag-like bodies 14 is inserted into a hole 62 having a predetermined depth drilled in the ground 60. In the state, each bag-like body 14 is filled with a fluid filler 12 that cures in a predetermined manner from the ground side via the tube 13 to inflate the bag-like body 14. The filler 12 is caused to flow out from the discharge port portion 17 that directly faces the water-permeable formation 61 portion, and the filler 12 is cured to form a solidified portion 18 formed by curing the bag-like body 14 portion and the formation penetration. Is the ground anchor fixing portion 50 of the ground anchor.

  In addition, about the structure of the ground exposed part of a ground anchor, it is the same as that of a conventionally well-known ground anchor, and detailed description is abbreviate | omitted.

  The anchor underground portion 10 is integrally bundled with a plurality of tension members 11 made of a known high-strength linear body for anchors having a sufficient length so that a predetermined length can be left on the ground even in the underground arrangement state. A plurality of bag-like bodies 14 in which a tensile member 11 in a state of being formed is inserted and a tubular body 13 for filling a filler 12 communicates with the inside, and a cylindrical connection for connecting the bag-like bodies 14 to each other It is the structure provided with the member 15 for use.

  The anchor underground portion 10 includes a plurality of bag-like bodies 14 arranged in the longitudinal direction of the tension member 11 in a state of surrounding the tension member 11, and a cylindrical connection member 15 that is also in a state of surrounding the tension member 11. In detail, each bag-like body 14 is connected to each other, but in detail, mainly the gravel in the ground that is known from the ground information acquired in advance in the ground survey before the anchor installation work One or a plurality of predetermined locations in the longitudinal direction of the anchor underground portion 10 that correspond exactly to the underground formation 61 position having the water permeability to be in the underground insertion state is set as a non-inflatable portion that is not expanded in the filling material 12 filling state. It is the structure which arrange | positions the connection member 15 which is not. The connecting member 15, which is the non-expanded portion, prevents the backflow from the ground side and discharges the holes 62 of the filler 12 filled in the bag-like body 14 and allows partial outflow to the ground side. An outlet portion 17 is provided.

  Thereby, when the anchor underground portion 10 is inserted into the holes 62 drilled in the ground 60 and filled with the filler 12 from the ground side through the tubular body 13 inside each bag-like body 14, With the expansion of each bag-like body 14 and the outflow of the filler 12 from the discharge port 17, the penetration and hardening of the filler 12 into the water-permeable base layer 61 can be expected together with the expansion and hardening of the bag-like body 14 portion. Become.

  The bag-like body 14 is made of a tubular woven material having a strength that does not break against contact with the hole wall when the hole 62 is inserted and pressure from the inside when the filler is filled. Leakage is achieved by placing the outer end portions of the tension member 11 and / or the connecting member 15 that are formed by integrating a plurality of both ends at the outer periphery and sealing them together. It is formed in a bag shape without any. The bag-like body 14 is sized to have a larger diameter than the hole 62 drilled in the ground in the maximum expanded state, and the longitudinal dimension is determined by the connecting member 15 interposed between the bag-like bodies 14. Each bag 14 is appropriately adjusted and set so as to be positioned at the one or more predetermined locations as the non-inflatable portion.

  Thereby, the bag-like body 14 can be efficiently arranged in the hole 62, and any bag-like body 14 can be expanded and cured as a part of the underground fixing portion 50, and the water-permeable ground layer 61 can be formed. Together with the consolidated portion 18 formed in the portion, the support force by the bag-like body 14 portion and the consolidated portion 18 can be maximized. Even if the ground 60 is a soft ground, the bag-like body 14 expands larger than the initial hole diameter of the hole 62 and hardens, so that a sufficient supporting force can be secured together with the consolidated portion 18.

  A tube body 13 for filling the filler 12 is also inserted and disposed in the bag-like body 14. The tube body 13 in the bag-like body 14 has a large number of holes through which the filler material 12 flows out at predetermined intervals, and the filler material 12 fed from the ground surface side with a given pressure is supplied to each bag-like body 14 and The inside of the connecting member 15 can be supplied and filled.

  The connecting member 15 is made of a cylindrical body having a strength that is not deformed by the filling pressure of the filler 12, and has openings 15 a having a size that allows the filler 12 to pass therethrough on a plurality of circumferential side surfaces. In the state of surrounding the tube body 13, the end portions of the bag-like body 14 are integrally connected to both ends, and the bag-like body 14 is communicated with each other and disposed between the bag-like bodies 14. The connecting member 15 is a cylindrical flexible body that surrounds the outer periphery of the connecting member 15 including the position of each opening 15a and closes each opening 15a so that it can be opened by pressure from the inside of the connecting member 15. The check valve body 16 is disposed, and the discharge port portion 17 is configured by a combination of the check valve body 16 and the opening 15 a of the connecting member 15.

  Inside the connecting member 15, spacers 19 are arranged to prevent the physical interference by keeping the tension members 11 bundled together and the tube body 13 at a predetermined interval. The plurality of tension members 11 are anchors. They are constrained integrally in a state of being arranged at equal intervals around the central axis of the underground portion 10.

  The consolidation unit 18 that forms a part of the underground fixing unit 50 is a discharge port of a predetermined amount of the filler 12 that has flowed out from the discharge port unit 17 on the connecting member 15 in a state where the bag-like body 14 is expanded. For the bag-like body 14 portion formed by infiltration into the ground layer 61 having water permeability located around the portion 17 and consolidation of earth and sand in the filler infiltration range accompanying hardening, and substantially equal to the hole diameter This is a knurled shape based on penetration and diffusion according to the amount of the filler 12.

  The solidified portion 18 that is added to the bag-like body 14 part and acts on the ground support pressure becomes a size that can exhibit sufficient pulling resistance corresponding to a load such as a landslide load on the ground 60. In consideration of the size and density (penetration degree) of the water-permeable base layer 61, the infiltration range into the ground, that is, the amount of the filler 12 is adjusted.

  The filler 12 is a fluid similar to that used in the underground fixing portion of a conventional ground anchor, etc., and has a property of hardening after a predetermined time from filling the bag-like body 14, It is a known grout such as mortar or polymer solution, and detailed description thereof is omitted.

  Next, the ground anchor arrangement process to which the anchor structure based on the above configuration is applied and the ground holding state by the anchor will be described. As a premise, it is assumed that the construction target ground has been investigated before anchor work including drilling holes in the ground, and various information on the ground including the position of the permeable stratum 61 has been grasped. .

  As the anchor placement process, first, based on the anchor installation plan, the anchor placement hole 62 drilled in the ground 60 is pre-adjusted to the hole 62 at a construction site or another place in advance. The anchor underground portion 10 is integrally assembled by connecting and arranging the bag-like body 14 and the connecting member 15 so as to correspond to the position of the water-permeable formation 61 on the outer side of one end portion of the tension members 11 in a bundled state. Are inserted into the holes 62 while holding the other end side of the tension member 11 and the tubular body 13 on the ground surface side.

  When the anchor underground portion 10 is reached to an appropriate depth position as planned so that the position of the connecting member 15 faces the water-permeable formation 61 in the hole 62, the tubular body enters the bag-like body 14 from the ground surface side. The filling material 12 is pressurized and filled through 13 to fill the inside of the connecting member 15 with the filling material 12 and expand each bag-like body 14. The bag-like body 14 is woven and has a permeability such that some components of the filling material filled therein are dyed to the outside through fine gaps in the texture. A part of the material 12 fills a slight gap between the outer surface of the bag-like body 14 that has exuded and expanded on the ground 60 side and the hole wall, and strengthens the close contact state between the bag-like body 14 and the ground 60. .

  When the outer peripheral portion of the expanded bag-like body 14 comes into contact with the hole wall and the expansion does not proceed and the internal pressure of the bag-like body 14 and the connecting member 15 increases, the filler 12 is put into the check valve body 16 at the discharge port portion 17. The outer wall is deformed outward until it reaches an internal / external communication state, flows out to the outside, fills the gap around the connecting member 15, and then permeates the water-permeable formation 61. Since the check valve body 16 is deformed and allows the filler 12 to flow out only when the pressure inside the bag-like body 14 and inside the non-inflatable connecting member 15 communicating with the bag-like body 14 is increased. In addition to suppressing wasteful outflow of the filler 12, it is possible to realize outflow and permeation of the filler 12 out of the connecting member 15 in a state in which backflow is also reliably prevented.

  When a predetermined amount of the filler 12 flows out and penetrates into the water-permeable formation 61, the supply of the filler from the ground surface side is stopped and the filler 12 is cured. When the filler 12 in the bag-like body 14 is cured, the filler 12 that has penetrated the ground layer 61 having the water permeability of the ground 60 is also cured. A consolidated portion 18 is formed by integrating the soil and sand of the infiltrating portion with the hardened filler 12. The cured bag-like body 14 portion of the filler 12 and the consolidated portion 18 having a shape that rises like a node from the bag-like body 14 portion by consolidation of the cured filler and earth and sand. However, it becomes the integrated underground fixing unit 50.

  After completion of the underground fixing portion 50, as in general anchor construction, if necessary, a filler is provided from the opening of the hole 62 into the void portion in the hole 62 closer to the ground surface than the underground fixing portion 50. Finally, the tension member 11 whose end is fixed by the underground fixing unit 50 is tensioned until a predetermined tension is obtained, and the end of the tension member 11 in the tension state is fixed. The anchor work is completed if the pressure receiving member 55 on the ground surface is integrally connected and fixed.

  In the constructed anchor, the underground fixing portion 50 and the pressure receiving member 55 are connected by the tension member 11 to form an integral structure in which a tension force acts in a direction in which they are attracted to each other. In the underground fixing portion 50, the filler 12 hardened in the bag-like body 14 and the solidified portion 18 on the ground 60 side are firmly connected and integrated, and the friction resistance between the cured bag-like body 14 portion and the ground 60 is obtained. Not only the force but also the supporting force of the ground is applied by the solidified portion 18 bulging from the bag-like body 14 to further increase the pulling resistance against the ground 60 and efficiently increase the anchor supporting force. Will be allowed to. With such an anchor having a structure having an underground fixing portion, it is possible to reliably hold the ground around the anchor so as not to move, and to prevent collapse of a natural ground such as a landslide.

  Thus, in the anchor structure according to the present embodiment, the position of the connecting member 15 that is a non-expanded portion in the anchor underground portion 10 is set in accordance with the formation 61 having the water permeability of the ground 60, and after insertion into the ground When the bag-like body 14 is inflated with the filler 12, a part of the filler 12 flows out from the discharge port portion 17 on the connecting member 15, and the water-permeable formation is located around the connecting member 15. The filler material 12 permeates and diffuses into the 61 portion, and the consolidated portion 18 formed by curing the filler material 12 that has spread beyond the drilling range forms the anchor ground together with the hardened bag-like body 14 portion. Since the intermediate fixing portion 50 is formed, the consolidation portion 18 is a resistor portion that is wider than the drilling range, so that the pulling resistance with respect to the ground 60 is remarkably increased. The size of the external consolidated portion 18 can be easily adjusted without changing the filling state of the material 12 into the bag-like body 14, and the supporting force suitable for the purpose of use and the ground condition can be obtained through rational construction without waste. It can be obtained reliably, and is excellent in terms of the cost for anchor construction.

  In addition, since the pulling resistance can be increased by the consolidated portion 18 wider than the drilling range, the anchor can be made smaller than before when the same supporting force is used, and handling of each part of the anchor, drilling and placing work can be performed. This is also advantageous, and the overall cost of anchor construction can be reduced. Furthermore, the amount of the filler 12 supplied is determined by the size of the consolidated portion 18 formed outside the bag-like body 14 part without causing outflow to cracks or the like in the ground other than the water-permeable formation 61. The amount of the filler 12 can be kept to a minimum and not only in terms of cost, but also the adverse effect on the environment around the anchor due to excessive outflow of the filler can be prevented. .

  In the anchor structure according to the above-described embodiment, the bag-like body 14 is slightly permeable and allows a part of the filler 12 to pass outside the bag-like body 14 and is dyed from the outer surface of the bag-like body 14. Although the close contact between the bag-like body 14 and the ground 60 is made stronger with the filler 12, the present invention is not limited to this, and the bag-like body is made of a material that does not allow the filler to be dyed. The discharge port can also serve as a filler supply for filling the gap between the outer surface of the bag-like body and the hole wall, and the pressure inside the bag-like body just before the bag-like body is completely inflated is slightly low If the filler outflow from the discharge port is started from the state, it is possible to obtain a state in which a part of the filler is appropriately interposed between the outer surface of the bag-like body and the hole wall as in the above embodiment. Thus, the adhesive state between the bag-like body and the ground can be strengthened after the filler is cured.

(Second embodiment of the present invention)
A second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is an explanatory diagram of an underground placement state of the anchor underground portion in the anchor structure according to the present embodiment. FIG. 7 is a longitudinal sectional view and a transverse sectional view of the discharge port portion in the anchor underground portion of the anchor structure according to the present embodiment. 8 is an explanatory diagram of a filling state of the anchor underground portion in the anchor structure according to this embodiment, and FIG. 9 is an explanatory diagram of a completed state of the underground fixing portion in the anchor structure according to this embodiment.

  In each of the drawings, in the anchor structure according to the present embodiment, the anchor underground portion 20 including the plurality of tension members 21 and the plurality of bag-like bodies 24 is inserted into the hole 62 of the ground 60 as in the first embodiment. In this state, each bag-like body 24 is filled with the filler 22 to inflate the bag-like body 24, and the filler 22 flows out from the discharge port portion 27 that just faces the underground water-permeable base layer 61 portion. The filler 22 is cured, and the solidified portion 28 formed by curing the bag-like body 24 portion and the formation penetration is used as the ground anchoring portion 50 of the ground anchor. The bag-like body 24 also exists at a predetermined location where the discharge port portion 27 of the anchor underground portion 20 is located, and a restraining member 25 that surrounds and restrains the bag-like body 24 from the outside is disposed at the predetermined location. It has a configuration that That.

  The anchor underground portion 20 is bundled with a plurality of tension members 21 made of a known high-strength linear body for anchors, which is sufficiently long to leave a predetermined length on the ground even in the underground arrangement state. The tension member 21 in an integrated state is inserted into the inside, and one bag-like body 24 in which the tube 23 for filling the filler 22 communicates with the inside, and a predetermined portion of the bag-like body 24 is restrained from the outside. And a plurality of substantially annular restraining members 25 serving as non-inflatable portions.

  The anchor underground portion 20 surrounds and restrains the bag-like body 24 and the inner tension member 21 together at a predetermined position in the longitudinal direction of the tension-like member 21 of the bag-like body 24 in a state surrounding the tension member 21. It is structured to have a substantially annular restraining member 25 to be in a state, but in detail, the gravel in the ground that is already known from the ground information acquired in advance in the ground survey before the anchor installation work One or a plurality of predetermined positions in the longitudinal direction of the anchor underground portion 20 that correspond exactly to the underground formation 61 position having water permeability as a main component in the underground insertion state is set as a non-inflatable portion that does not expand in the filling material 22 filling state. The restraint member 25 for preventing the bag-like body 24 from being inflated and deformed is arranged. And the discharge port which accept | permits the partial flow to the hole 62 of the filler 22 with which the bag-like body 24 was filled on the restraint member 25 used as this non-expanded part, and the bag-like body 24 was filled, and the ground side A portion 27 is provided.

  As a result, the anchor underground portion 20 is filled with the filler 22 from the ground side through the tubular body 23 into the bag-like body 24 while being inserted into the hole 62 of the ground 60 as in the first embodiment. Then, with the expansion of the bag-like body 24 and the outflow of the filler 22 from the discharge port 27, the penetration and hardening of the filler into the water-permeable base layer 61 can be expected together with the expansion and hardening of the bag-like body 24 portion. It becomes.

  The bag-like body 24 is made of a tubular woven material having a strength that does not break against contact with the hole wall when the hole 62 is inserted and pressure from the inside when the filler is filled. There is no leakage by placing the outer ends of the tension member 21 with a plurality of open ends and binding them together at the outer peripheral portion of the tension member 21 and the intermediate outer peripheral portions. It is formed in a bag shape. The bag-like body 24 has a size larger than that of the hole 62 drilled in the ground in the maximum inflated state, and the longitudinal dimension thereof is the same as the length of the underground fixing unit 50 set in advance.

  The constraining member 25 is formed as a substantially annular body whose size that can be surrounded from the outside in order to constrain the bag-like body 24 and the tension member 21, and an opening 25a having a size through which the filler 22 can pass. Is configured to be drilled and arranged on a plurality of circumferential side surfaces. The size of the inner side of the annular portion can be changed by adjusting the engagement position of each end of the parts constituting the restraining member 25, and the restrained shape and size differ depending on the longitudinal position of the bag-like body 24 and the tension member 21. In addition, the restraint position can be arbitrarily set in the longitudinal direction of the tension member 21 in correspondence with one kind of restraint member, and the restraint position can be surely associated with the position of the water-permeable formation 61 in the hole 62 insertion state.

  Corresponding to the opening 25a formed in the restraining member 25, the portion to be restrained by the restraining member 25 of the bag-like body 24 has a size that allows the filler 22 to pass therethrough and the opening 25a of the restraining member 25. A plurality of through-holes 24a communicating with is formed. And in the arrangement | positioning state which surrounds the opening part 25a part of the restraint member 25, and the through-hole 24a part of the bag-like body 24 on the outer side of the restraint member 25, the opening part 25a of the restraint member 25 and the through-hole of the bag-like body 24 A cylindrical flexible check valve body 26 that closes the opening 24a with pressure from the inside of the bag-like body 24 is disposed. The check valve body 26, the opening 25a of the restraining member 25, and the bag shape. The discharge port portion 27 is configured in combination with the through hole 24 a of the body 24.

  A spacer for preventing physical interference by maintaining the tension members 21 and the tube body 23 that are bundled together at a predetermined interval inside the restrained portion of the bag-like body 24 that is the non-inflatable portion of the anchor underground portion 20 29 is arranged, and the plurality of tension members 21 are integrally restrained in a state of being arranged at equal intervals around the central axis of the anchor underground portion 20.

  The consolidation portion 28 forming a part of the underground fixing portion 50 is a discharge port for a predetermined amount of the filler 22 that has flowed out from the discharge port portion 27 in the restraining member 25 site in a state where the bag-like body 24 is inflated. It is formed by solidification and integration of soil in the filler infiltration range accompanying hardening and penetration into the water-permeable base layer 61 located around the portion 27, and is substantially equal to the drilling hole diameter as in the first embodiment. The bag-like body 24 has a knot-like raised shape based on penetration and diffusion according to the amount of the filler 22. In the first embodiment, the amount of the filler is adjusted so that the solidified portion 28 that acts on the ground support pressure has a size that allows the ground 60 to exhibit sufficient pulling resistance. Is the same.

  Next, the ground anchor arrangement process to which the anchor structure based on the above configuration is applied will be described. As in the first embodiment, it is assumed that various ground information including the position of the water permeable formation 61 is grasped in the ground survey before anchor construction. As the anchor placement process, first, based on the anchor installation plan, the anchor placement hole 62 drilled in the ground 60 is pre-adjusted to the hole 62 at a construction site or another place in advance. An anchor underground portion in which a bag-like body 24 is arranged outside one end portion of a plurality of bundled tension members 21, and a restraint member 25 is attached so as to correspond to the position of the water-permeable formation 61 and assembled together. 20 is inserted into the hole 62 while the other ends of the tension member 21 and the tube body 23 are held on the ground surface side.

  When the anchor underground portion 20 is reached to an appropriate depth position as planned so that the position of the restraining member 25 faces the water-permeable formation 61 in the hole 62, as in the first embodiment, the inside of the bag-like body 24. Then, the filler 22 is pressurized and filled from the ground surface side through the tube body 23 to inflate the bag-like body 24. When the soft ground portion 63 exists in the ground 60, the expanding bag-like body 24 expands the hole wall and expands beyond the initial drilling diameter (see FIGS. 6 and 8). When the outer peripheral portion of the expanded bag-like body 24 comes into contact with the hole wall or spreads to the ground side as much as possible at the soft ground portion 63 and the expansion does not proceed and the internal pressure of the bag-like body 24 increases, In the portion 27, the check valve body 26 is deformed outward until it reaches an internal / external communication state, flows out to the outside, fills the space around the restraining member 25, and then permeates into the water-permeable formation 61.

  When a predetermined amount of the filler 22 flows out and penetrates into the water-permeable formation 61, the filling of the filler from the ground surface side is stopped and the filler 22 is cured, as in the first embodiment. Along with the hardening of the filler 22 in the bag-like body 24, the filler 22 that has penetrated into the water-permeable ground layer 61 of the ground 60 also hardened, and the water-permeable ground layer 61 portion was hardened with the earth and sand of the filler-permeable portion. A consolidated portion 28 integrated with the filler 22 is formed, and forms the underground fixing portion 50 together with the cured bag-like body 24 portion of the filler 22.

  Once the underground fixing unit 50 is obtained, the end of the tension member 21 that has been tensioned is connected and fixed to the pressure receiving member after filling the void in the hole 62 with a filler and curing, as in the first embodiment. Anchor construction will be completed. As in the first embodiment, the constructed anchor is not only a frictional resistance force between the hardened bag-like body 24 portion in the underground fixing portion 50 and the ground 60, but also the ground portion 28 and the bag-like body 24. By applying the support pressure of the ground at the expanded portion having a diameter larger than the hole diameter, the pulling resistance to the ground 60 can be further increased, and the supporting force of the anchor can be increased efficiently.

  As described above, in the anchor structure according to the present embodiment, the anchor underground portion 20 is configured to locate the bag-like body 24 at a predetermined location corresponding to the water-permeable formation 61, and the bag-like body 24 is in an unexpanded state. Since the disposing position of the restraining member 25 maintained at the same position can be set as the position of the discharge port portion 27 as it is, the bag-like body after the tension member 21 and the bag-like body 24 forming the anchor underground portion 20 have already been assembled together. Even when the position and dimensions of the 24 cannot be easily changed, a predetermined position on the bag-like body 24 corresponding to the position of the water-permeable formation 61 can be set as the position of the discharge port 27, and the filling material 22 can be discharged from the discharge port 27. Can be reliably sent to the portion 61 of the water-permeable formation. In addition, it is not necessary to adjust the size of the bag-like body 24 for providing other members that form the discharge port portion 27, and when the bag-like body 24 is made of a high-strength material, it is possible to save labor of processing, thereby fixing the anchor underground portion. 20 can be simplified, and it is not necessary to prepare a plurality of types of bag-like bodies 24 having different dimensions, and the types of bag-like bodies 24 can be limited to reduce costs.

  In addition, in the anchor structure according to each of the above embodiments, an example is shown in which the structure is applied in the case where the water permeable ground layer 61 partially exists in the anchor placement portion of the ground 60, but the anchor placement is shown. Of course, the case where the majority of the part of the stratum has water permeability is also an object of application, and in that case, the positions of the discharge port portions 17 and 27 in the anchor underground portions 10 and 20 can be appropriately set. . At this time, the connecting member 15 or the connecting member 15 or 20 is configured to allow the filler to flow out using the portion where the bundled tensile members 11 and 21 forming the anchor underground portions 10 and 20 have a minimum diameter as a non-expandable portion. It is preferable in that the anchor underground portions 10 and 20 including the restraining member 25 as a part of the configuration can be configured as thin and compact as possible. In addition, when the ground 60 has a plurality of layers having water permeability, any one or a plurality of layers can be appropriately selected as the infiltration target of the filler, and as shown in FIG. , 65 may be formed every 65, 39.

  Moreover, in the anchor structure according to each of the above-described embodiments, the discharge outlets 17 and 27 of the anchor underground portions 10 and 20 are arranged at the non-inflated portion, such as the connection member 15 and the restraining member 25. The structure of the discharge port portions 17 and 27 can be simplified by not expanding with the filling of the filler, and the outflow state of the filler to the outside can be reliably controlled. As long as it is possible to realize a mechanism for preventing the backflow from the outside to the inside of the bag-like body and suppressing the excessive outflow of the filler as the discharge port portion in the anchor ground portion, the anchor ground having this discharge port portion is not limited. One or a plurality of predetermined portions in the middle part may be deformed by expansion or the like.

  In the anchor structure according to each of the above embodiments, the bag-like bodies 14 and 24 may be various as long as they have a strength that does not easily break when inserted into the hole 62 or when the fillers 12 and 22 are filled. However, when a high tensile strength woven fabric made of aramid fibers or the like is used as the bag-like body, breakage is unlikely to occur, and the bag-like body in the maximum filling state of the filler is used. The internal pressure can be further increased, the filler density is increased, the strength as the underground fixing portion after curing and the frictional resistance with the ground can be further increased, which is more preferable.

It is a schematic block diagram of the anchor structure which concerns on the 1st Embodiment of this invention. It is underground placement state explanatory drawing of the anchor underground part in the anchor structure concerning a 1st embodiment of the present invention. It is the longitudinal cross-sectional view and cross-sectional view of the discharge outlet part in the anchor underground part of the anchor structure which concerns on the 1st Embodiment of this invention. It is filling material explanatory drawing to the anchor underground part in the anchor structure which concerns on the 1st Embodiment of this invention. It is completion state explanatory drawing of the underground fixing part in the anchor structure which concerns on the 1st Embodiment of this invention. It is an underground arrangement | positioning state explanatory drawing of the anchor underground part in the anchor structure which concerns on the 2nd Embodiment of this invention. It is the longitudinal cross-sectional view and cross-sectional view of the discharge outlet part in the anchor underground part of the anchor structure which concerns on the 2nd Embodiment of this invention. It is a filler filling state explanatory drawing to the anchor underground part in the anchor structure concerning a 2nd embodiment of the present invention. It is completion state explanatory drawing of the underground fixing part in the anchor structure which concerns on the 2nd Embodiment of this invention. It is a completed state explanatory drawing of the underground fixing part in the anchor structure concerning other embodiments of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 20 Anchor underground part 11, 21 Tensile member 12, 22 Filler 13, 23 Pipe body 14, 24 Bag-like body 15 Connection member 15a Opening part 16, 26 Check valve body 17, 27 Discharge port part 18, 28 Consolidation part 19, 29 Spacer 24a Through hole 25 Restraining member 25a Opening part 38, 39 Consolidation part 50 Underground fixing part 55 Pressure receiving member 60 Ground 61 Water-permeable ground layer 62 Hole 63 Soft ground part 64, 65 Water permeability Having strata

Claims (6)

An anchor underground portion including one or a plurality of tensile members formed of a linear body and a bag-like body in which the tensile member is inserted and a filler filling tube communicates with the inside is provided on the ground. The bag-like body is inflated by filling the bag-like body with a predetermined hardening fluidity material from the ground side through the tube body in a state where the hole is drilled to a predetermined depth position. In addition, in the anchor structure in which the filler is cured, and the expanded and cured bag-like body portion is an underground fixing portion,
One or more predetermined ones in the longitudinal direction corresponding to the position of the underground layer having water permeability in the ground, which has been known from the ground information previously acquired in the anchor placement, among the anchor underground portions In the place, a discharge port portion that allows a partial outflow to the hole and the ground side of the filler filled in the bag-like body while preventing a back flow from the ground side is disposed,
As the bag-like body expands, a predetermined amount of the filler that has flowed out of the discharge port portion penetrates into the water-permeable formation around the discharge port portion and cures, and the peripheral portion of the discharge port portion An anchor structure characterized in that a solidified part larger than the drilling hole diameter is formed on the base. The anchor structure according to claim 1,
The anchor underground portion has a structure in which a plurality of bag-like bodies are arranged in the tensile member longitudinal direction and connected to each other via a predetermined non-inflatable connecting member,
The anchor structure characterized in that the dimension of each bag-like body in the longitudinal direction of the tensile member is set so that the connecting member interposed between the bag-like bodies is located at the one or more predetermined positions. The anchor structure according to claim 2,
The connecting member is made of a cylindrical body having a strength that is not deformed by the filling pressure of the filler, and an opening having a size through which the filler can pass is formed in one or a plurality of side surfaces, and the tension member and the pipe In the state of surrounding the body, the bag-like body ends are integrally connected to both ends, respectively, and communicate with each bag-like body,
A check valve body of a substantially cylindrical flexible body that closes the opening of the connecting member so as to be openable by pressure from the inside of the connecting member is disposed surrounding the outer periphery of the connecting member,
An anchor structure in which an opening portion of the connecting member and a check valve body are used as the discharge port portion. The anchor structure according to claim 1,
A bag-like body is located at the one or more predetermined locations of the anchor underground portion, and a restraining member for restraining the bag-like body and the inner tension member in a non-expanded state is disposed at the one or more predetermined locations. An anchor structure characterized by In the anchor structure according to claim 4,
An anchor structure characterized in that the restraining member is formed as a substantially annular body whose size that can be surrounded from the outside in order to restrain the bag-like body and the tension member. In the anchor structure according to claim 4 or 5,
The restraining member is formed by drilling an opening having a size through which a filler can pass on one or a plurality of side surfaces,
One or a plurality of through-holes that are large enough to allow the filler to pass therethrough and communicate with the opening of the restraining member are formed in the portion of the bag-like body where the restraining member is disposed, and the opening of the restraining member and the bag The check valve body of a substantially cylindrical flexible body that closes the through hole of the cylindrical body so as to be openable by pressure from the inside of the bag-shaped body surrounds the opening portion of the restraining member and the through-hole portion of the bag-shaped body Arranged in
The anchor structure, wherein the opening of the restraining member, the through hole of the bag-like body, and the check valve body are the discharge port portion.

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