JP6899277B2 - Construction method of anchor members and soil structures - Google Patents

Description

The present invention relates to a method for construction of the anchor member and the soil structure using the same.

Conventionally, as a foundation material for construction for constructing the foundation of a structure, there is a rod-shaped reinforcing material used for reinforcement of natural slopes and cut slopes, existing retaining walls, and the like. For example, there is a rod-shaped construction base material having an enlarged portion (buckling member) at the tip portion that expands underground after casting (for example, Patent Documents 1 and 2).

In Patent Documents 1 and 2, the buckling member is enlarged by using a reaction force pipe or a jig arranged so as to cover the outer circumference of the rod. Specifically, the rod is moved to the opposite side of the driving direction while the movement of the end portion of the buckling member (the end opposite to the driving direction) is restricted by using a reaction force pipe or a jig. As a result, a plurality of rod-shaped buckling members constituting the buckling member are compressed and buckled in a dogleg shape.

JP-A-2007-239340 Japanese Unexamined Patent Publication No. 2013-221330

In the above-mentioned prior art, it is necessary to buckle each buckling member of the buckling member using a reaction force pipe (or jig), and then pull out the reaction force pipe from the rod-shaped construction foundation material. For this reason, when constructing a structure using a construction foundation material, the construction foundation material is driven into the installation hole to buckle each buckling material of the buckling member, and then the installation hole and the rod are connected. It is necessary to pull out the reaction force pipe placed between them. Therefore, it is important to prevent deterioration of workability due to the work of pulling out the reaction force pipe.

The present invention has been made in view of the foregoing problems, the construction of the soil structure with an anchor member of the rod-shaped first end of the pouring direction comprises a buckled plurality of loci屈材The purpose is to improve the workability when performing.

The present invention provides an anchor member of the rod-shaped to be Da設the soil structure using the soil, and a hollow cylindrical first rod-like member, the pouring direction of the anchor member than the first rod-like member A hollow cylindrical rod-shaped member arranged on the tip end side, the second rod-shaped member into which a part of the tip end side of the first rod-shaped member in the driving direction is slidably inserted, and the anchor member. A rod-shaped member that can be removed from the anchor member after being placed on a soil structure, and is a cylindrical third rod-shaped member that is slidably inserted into the first rod-shaped member and the second rod-shaped member. A member, a plurality of buckling members which are rod-shaped members arranged so as to extend in the driving direction on the outer periphery of the first rod-shaped member, and a disk for fixing one end of each of the plurality of buckling members. A first plate-shaped member having a hole in the center, which is a plate-shaped member, and a disk-shaped plate-shaped member, which fixes other ends of each of the plurality of buckling members, in the center. It has a buckling member including a second plate-shaped member provided with a hole in the portion, and the second plate-shaped member is installed on the rear end side in the driving direction with respect to the first plate-shaped member. The second rod-shaped member is inserted into the hole of the first plate-shaped member, and the first plate-shaped member is placed on the outer periphery of the second rod-shaped member near the rear end portion in the driving direction. The first rod-shaped member is inserted into the hole of the second plate-shaped member so as not to move to the tip end side in the direction, and the second plate-shaped member is driven around the outer periphery of the first rod-shaped member. The first rod-shaped member is fixed so as not to move to the rear end side in the direction, the first rod-shaped member is provided with a first male screw member on the outer periphery of the tip portion in the driving direction, and the second rod-shaped member is the first male screw. A first female screw member to be screwed into the member is provided on the rear end side of the inner circumference of the tip portion in the driving direction, and a second female screw member is provided on the tip side of the inner circumference. A second male screw member screwed into the second female screw member is provided on the outer periphery of the tip portion in the driving direction, and the plurality of buckling members are formed on the second female screw member by the second male screw member. In a state where the members are screwed together, the third rod-shaped member is moved to the side opposite to the driving direction to reduce the distance between the first plate-shaped member and the second plate-shaped member. It is compressed between the first plate-shaped member and the second plate-shaped member and buckled in a dogleg shape .

According to the present invention, it is possible to improve the workability in the case of performing the construction of a soil structure with an anchor member of the rod-shaped first end of the pouring direction comprises a buckled plurality of loci屈材..

It is a side view which shows the whole structure of the foundation material 10 for construction which concerns on embodiment of this invention. It is a top view which shows the 1st plate 60 and the 2nd plate 70 provided in the building foundation material 10 which concerns on embodiment of this invention. It is a top view which shows the 3rd plate 80 and 4th plate 90 which the building foundation material 10 which concerns on embodiment of this invention includes. It is a figure which shows an example of the construction method which performs the construction to stabilize the existing retaining wall and the back ground by using the construction foundation material 100 which attached the spacer and the packer. It is a figure which shows an example of the construction method which performs the construction to stabilize the existing retaining wall and the back ground by using the construction foundation material 100 which attached the spacer and the packer. It is a figure which shows an example of the construction method which performs the construction to stabilize the existing retaining wall and the back ground by using the construction foundation material 100 which attached the spacer and the packer. It is a figure which shows an example of the construction method which performs the construction to stabilize the existing retaining wall and the back ground by using the construction foundation material 100 which attached the spacer and the packer.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Structure of foundation material for construction]
FIG. 1 is a side view showing the overall configuration of the construction foundation material 10 according to the embodiment of the present invention. The construction foundation material 10 is a rod-shaped construction foundation material (anchor member) used for reinforcing natural slopes and cut slopes, existing retaining walls, etc., and expands underground after the construction foundation material 10 is placed. The enlarged portion (buckling member 30) is provided on the tip end side in the driving direction. Note that FIG. 1 (1) shows a state before the buckling member 30 is enlarged, and FIG. 1 (2) shows a state in which the buckling member 30 is enlarged. In addition, on the left side of FIGS. 1 (1) and 1 (2), the side surface of the construction foundation material 10 when viewed from the tip side in the driving direction is shown in a simplified manner.

FIG. 2 is a plan view showing a first plate 60 and a second plate 70 included in the construction foundation material 10 according to the embodiment of the present invention. Further, FIG. 3 is a plan view showing a third plate 80 and a fourth plate 90 included in the construction foundation material 10 according to the embodiment of the present invention.

The construction foundation material 10 includes a rod 20, a buckling member 30, a steel pipe 40, and a PC (Prestressed Concrete) steel rod 50. The PC steel rod 50 can be removed from the construction foundation material 10 after the buckling member 30 (enlarged portion) is expanded underground after casting.

The rod 20 is a hollow cylindrical rod-shaped member, has a male screw member 21 having a predetermined length on the outer peripheral portion of the tip portion in the driving direction, and indicates the direction of the hydraulic jack 1 (shown in FIG. 1 (2)). The expansion adapter 22 for fixing is installed at the rear end portion (the end portion opposite to the tip end portion) in the driving direction. Further, a through hole 25 (shown in FIG. 1 (2)) penetrating the wall portion of the rod 20 in the radial direction is formed at a predetermined position on the outer circumference to allow high-pressure air, grout, etc. supplied into the rod 20 from the outside. It is supplied from the through hole 25 to the vicinity of the buckling member 30. The length of the male screw member 21 is such that after the buckling member 30 buckles, the rod 20 can be rotated to screw the female screw member 42 of the steel pipe 40 and the male screw member 21 of the rod 20. The length (see FIG. 1 (2)). Further, the length of the male screw member 21 is such that after the buckling member 30 has buckled, the rod 20 is rotated to position the through hole 25 at a predetermined position with respect to the first buckling member 31 and the second buckling member 35. It is long enough to move (see FIG. 1 (2)). Further, one or a plurality of through holes 25 are provided, and the arrangement thereof is such that a predetermined length is offset in the axial direction so that the supply of high-pressure air and grout is efficient, and the through holes 25 are arranged at equal intervals in the axial direction. Is preferable.

The buckling member 30 is a member arranged coaxially with the rod 20, the steel pipe 40, and the PC steel rod 50, and includes a plurality of first buckling members 31, a second buckling member 35, a first plate 60, and the like. A second plate 70, a third plate 80, and a fourth plate 90 are provided.

The first buckling material 31 and the second buckling material 35 are rod-shaped members (for example, steel materials) having a round cross section or a square cross section. Further, the materials and shapes of the first buckling material 31 and the second buckling material 35 are not limited as long as sufficient rigidity can be secured. Further, when a compression load of a predetermined value or more is applied to the first buckling material 31 and the second buckling material 35 in the axial direction, the first buckling material 31 and the second buckling material 35 are cut at a predetermined position so as to buckle from the substantially central portion to the outside of the rod 20. Notches 32 to 34 are formed. The notch 32 is formed inside the substantially central portion of the first buckling material 31 and the second buckling material 35, and the notches 33 and 34 are both ends of the first buckling material 31 and the second buckling material 35. Formed on the outside. By forming the notches 32 to 34 in this way, the first buckling member 31 and the second buckling member 35 buckle to the outside of the rod 20 in a dogleg shape from the central portion thereof. As described above, the first buckling member 31 and the second buckling member 35 buckle to the outside of the rod 20 in a dogleg shape, so that the buckling member 30 expands to the outside of the rod 20. The bending member 30 functions as an enlarged portion (tip enlarged portion).

As shown in FIG. 2, the first plate 60 and the second plate 70 are a pair of plates for installing a plurality of first buckling members 31 on the same radius at predetermined intervals. Further, the first plate 60 and the second plate 70 have substantially the same shape and are formed in a disk shape.

As shown in FIG. 2 (1), the first plate 60 has a through hole 60a through which the steel pipe 40 (rod 20) is inserted in the central portion thereof. Further, a plurality of through holes 60b into which one end of the first buckling member 31 is fitted are formed in the first plate 60 on the same radius at predetermined intervals. Further, as shown in FIG. 2 (2), the second plate 70 has a through hole 70a through which the rod 20 is inserted in the central portion thereof. Further, a plurality of through holes 70b into which the other end of the first buckling member 31 is fitted are formed in the second plate 70 on the same radius at predetermined intervals. The first plate 60, the second plate 70, and the first buckling member 31 are fixed by welding or the like.

As shown in FIG. 3, the third plate 80 and the fourth plate 90 are a pair of plates for installing a plurality of second buckling members 35 on the same radius at predetermined intervals. Further, the third plate 80 and the fourth plate 90 have substantially the same shape and are formed in a disk shape. Further, the third plate 80 and the fourth plate 90 are arranged between the first plate 60 and the second plate 70.

As shown in FIG. 3 (1), the third plate 80 has a through hole 80a through which the steel pipe 40 (rod 20) is inserted in the central portion thereof. Further, a plurality of through holes 80b into which one end of the second buckling member 35 is fitted are formed in the third plate 80 on the same radius at predetermined intervals. Further, as shown in FIG. 3 (2), the fourth plate 90 has a through hole 90a through which the rod 20 is inserted in the central portion thereof. Further, a plurality of through holes 90b into which the other end of the second buckling member 35 is fitted are formed in the fourth plate 90 on the same radius at predetermined intervals. The third plate 80, the fourth plate 90, and the second buckling member 35 are fixed by welding or the like.

Further, as shown in FIG. 3 (1), a groove 80c opened on the outer peripheral surface is formed between the through holes 80b in the third plate 80. Further, as shown in FIG. 3 (2), a groove 90c opened on the outer peripheral surface is formed between the through holes 90b in the fourth plate 90. Further, the first buckling member 31 is inserted and arranged in the grooves 80c and 90c. As a result, the first buckling member 31 and the second buckling member 35 are alternately arranged at equal intervals. Further, since the grooves 80c and 90c are formed by opening on the outer peripheral surfaces of the third plate 80 and the fourth plate 90, the buckling of the first buckling material 31 to the outside of the rod 20 is caused by the third plate 80 and the third plate 90. It is not blocked by the fourth plate 90.

In this way, the third plate 80 and the fourth plate 90 on which the plurality of second buckling members 35 are installed are between the first plate 60 and the second plate 70 on which the plurality of first buckling members 31 are installed. The second buckling member 35 is formed so that its axial length is shorter than that of the first buckling member 31. For example, in the second buckling material 35, after the first plate 60 approaches the second plate 70 by a predetermined distance as the steel pipe 40 moves, the third plate 80 is pressed against the first plate 60 and the fourth plate 90 It can be long enough to start approaching. When the second buckling material 35 is used as its length, when the second buckling material 35 is compressed between the third plate 80 and the fourth plate 90 and begins to buckle, the first buckling material has already started to buckle. Since 31 is buckled, the load required for buckling is reduced. Therefore, the load for buckling the first buckling material 31 and the second buckling material 35 is smaller than the case where the first buckling material 31 and the second buckling material 35 are buckled at the same time.

In FIGS. 1 to 3, five first buckling members 31 are installed on the first plate 60 and the second plate 70, and five second buckling members 31 are also installed on the third plate 80 and the fourth plate 90. An example in which the material 35 is installed is shown, but the number of the first buckling material 31 and the second buckling material 35 installed is not limited to five. Further, in FIGS. 1 to 3, an example in which two sets of plates (first plate 60 and second plate 70, third plate 80 and fourth plate 90) are used is shown, but one set of plates May be used to install a plurality of buckling materials.

Further, the first plate 60 is fixed to the fixing member 43 (for example, a nut) via the ring-shaped ring member 44 through which the steel pipe 40 is inserted. Further, the second plate 70 is fixed to the fixing member 23 (for example, a nut) via the ring-shaped ring member 24 through which the rod 20 is inserted. The installation of the ring members 24 and 44 may be omitted. In that case, the first plate 60 is directly fixed to the fixing member 43, and the second plate 70 is directly fixed to the fixing member 23.

The fixing member 43 is a female screw member screwed into a male screw portion of one end (opposite end of the tip) of the steel pipe 40, and is a female screw member of the first plate 60 and the third plate 80 via the ring member 44. Restrict movement to the tip side. Further, the fixing member 23 is a female screw member screwed into the male screw portion on the outer circumference of the rod 20, and is opposite to the tip portions (rear end portion) of the second plate 70 and the fourth plate 90 via the ring member 24. Regulate movement to the side).

In this way, the first plate 60 and the third plate 80 are fixed to the rear end portion (or its vicinity) of the steel pipe 40 on the outer circumference of the steel pipe 40. Further, the second plate 70 and the fourth plate 90 have the axial length of the steel pipe 40 and the axial length of the buckling member 30 after the buckling of the first buckling member 31 and the second buckling member 35. It is fixed at the position specified by (the position on the outer circumference of the rod 20). That is, the second plate 70 and the fourth plate 90 have the axial length of the steel pipe 40 and the axial length of the buckling member 30 after the buckling of the first buckling member 31 and the second buckling member 35. Is fixed at the position of the total length (position from the tip end portion on the outer circumference of the rod 20) (or its vicinity).

The steel pipe 40 is a hollow cylindrical rod-shaped member through which the rod 20 can penetrate, and is arranged so as to cover at least a part of the outer circumference of the rod 20. As a result, the steel pipe 40 can move around the outer circumference of the rod 20 in the axial direction. Further, in the steel pipe 40, the female screw members 41 and 42 are arranged at the tip end portion in the driving direction, and the fixing member 43 is arranged at the end portion (or its vicinity) on the opposite side of the tip end portion.

The female screw member 41 is a female screw member that is screwed into the male screw member 51 of the PC steel rod 50. Further, as shown in FIG. 1 (2), the female screw member 42 is a fixing member screwed into the male screw member 21 of the rod 20. Here, the female screw member 42 is provided at the tip end portion (tip portion in the driving direction) of the steel pipe 40, and the female screw member 41 is provided further on the tip end portion side than the female screw member 42. The inner diameter of the female screw member 42 is set to a size that allows the PC steel rod 50 to be slidably inserted. Therefore, the male screw member 51 of the PC steel rod 50 can penetrate the female screw member 42 and be screwed into the female screw member 41. Further, even after the male screw member 51 of the PC steel rod 50 is removed from the female screw member 41, the male screw member 51 of the PC steel rod 50 can be taken out from the inside of the female screw member 42.

The PC steel rod 50 is a cylindrical rod-shaped member capable of penetrating the inside of the rod 20 and the steel pipe 40, and has a male screw member 51 on the tip end side. By screwing the male screw member 51 into the female screw member 41 of the steel pipe 40, the PC steel rod 50 can be moved in the axial direction inside the rod 20, and the steel pipe 40 can be moved in the axial direction.

Specifically, as shown in FIG. 1 (2), the hydraulic jack 1 (drawing device, tip enlarger) is set on the PC steel rod 50 and the expansion adapter 22 of the construction base material 10. Then, with the movement of the expansion adapter 22 (rod 20) restricted, the PC steel rod 50 is pulled in the direction of the arrow 2 by applying flood pressure to the hydraulic jack 1. By pulling the PC steel rod 50 in the direction of arrow 2 in this way, the steel pipe 40 connected to the PC steel rod 50 can be moved in the direction of arrow 3. In this way, by moving the PC steel rod 50 to the opposite side of the tip portion (right side in FIG. 1) inside the rod 20, the steel pipe 40 can be moved to the opposite side (right side in FIG. 1). it can. In response to the movement of the steel pipe 40, the first plate 60 and the third plate 80 fixed to the fixing member 43 of the steel pipe 40 move to the second plate 70 and the fourth plate 90 side, and by this movement, the first plate 60 is moved. The five first buckling members 31 between the plate 60 and the second plate 70 and the five second buckling members 35 between the third plate 80 and the fourth plate 90 are compressed into a dogleg shape. Buckled like a shape.

Further, as shown in FIG. 1 (2), the PC steel rod 50 is moved to the opposite side of the tip portion (right side in FIG. 1), and the five first buckling members 31 and the five second buckling members 31 are moved. By buckling the 35 in a dogleg shape and then rotating the rod 20, the male screw member 21 of the rod 20 can be screwed into the female screw member 42 of the steel pipe 40. Further, the male screw member 51 of the PC steel rod 50 is removed from the female screw member 41 of the steel pipe 40, and the PC steel rod 50 is removed from the rod 20.

In this way, the buckling member 30 is compressed between the first plate 60 and the third plate 80 (first plate-shaped member) and the second plate 70 and the fourth plate 90 (second plate-shaped member). A first buckling material 31 and a second buckling material 35 (a plurality of buckling materials) capable of buckling are provided. Further, the rod 20 (first rod-shaped member) is a hollow rod-shaped member that regulates the movement of the second plate 70 and the fourth plate 90 (second plate-shaped member) to the opposite side in the driving direction. Further, a second plate 70 and a fourth plate 90 (second plate-shaped member) are fixed to the outer periphery of the rod 20 (first rod-shaped member). For example, the rod 20 (first rod-shaped member) penetrates the second plate 70 and the fourth plate 90 (second plate-shaped member) and is located on the outer periphery located at a predetermined distance in the axial direction from the tip portion in the driving direction. The 2 plate 70 and the 4th plate 90 (second plate-shaped member) are fixed. Further, the rod 20 (first rod-shaped member) is provided with a male screw member 21 (first male screw member) on the outer periphery of the tip portion in the driving direction. Further, the steel pipe 40 (second rod-shaped member) is a hollow rod-shaped member that regulates the movement of the first plate 60 and the third plate 80 (first plate-shaped member) in the driving direction. Further, the steel pipe 40 (second rod-shaped member) is hollow through which the rod 20 (first rod-shaped member) (at least a part of the rod 20 (first rod-shaped member) on the tip end side in the driving direction) is slidably inserted. It is a rod-shaped member of. Further, the first plate 60 and the third plate 80 (first plate-shaped member) are fixed to the outer periphery of the steel pipe 40 (second rod-shaped member). For example, the steel pipe 40 (second rod-shaped member) penetrates the first plate 60 and the third plate 80 (first plate-shaped member) and extends from the rear end portion in the driving direction to the outer circumference located at a predetermined distance in the axial direction. The first plate 60 and the third plate 80 (first plate-shaped member) are fixed. Further, the steel pipe 40 (second rod-shaped member) includes a female screw member 42 (first female screw member) screwed into the male screw member 21 (first male screw member) and a PC steel rod 50 (third rod-shaped member). A female screw member 41 (second female screw member) to be screwed into the male screw member 51 (second male screw member) is provided at the tip portion in the driving direction. Further, the male screw member 51 (second male screw member) is in the driving direction of the PC steel rod 50 (third rod-shaped member) for moving the steel pipe 40 (second rod-shaped member) to the opposite side in the driving direction. It is provided on the outer circumference of the tip.

Further, in the first buckling material 31 and the second buckling material 35 (plurality of buckling materials), the male screw member 51 (second male screw member) is screwed into the female screw member 41 (second female screw member). In this state, the PC steel rod 50 (third rod-shaped member) into which the rod 20 (first rod-shaped member) and the steel pipe 40 (second rod-shaped member) are slidably inserted is moved to the side opposite to the driving direction. By reducing the distance between the first plate 60 and the third plate 80 (first plate-shaped member) and the second plate 70 and the fourth plate 90 (second plate-shaped member), the first plate 60 and the third plate 60 and the third plate are formed. It is compressed between the plate 80 (first plate-shaped member) and the second plate 70 and the fourth plate 90 (second plate-shaped member) and buckled in a dogleg shape.

Further, after the first buckling material 31 and the second buckling material 35 (plurality of buckling materials) are buckled in a dogleg shape, a male screw is attached to the female screw member 42 (first female screw member). By screwing the member 21 (first male screw member), the tip of the rod 20 (first rod-shaped member) and the tip of the steel pipe 40 (second rod-shaped member) are connected, and the female screw member 41 (first rod-shaped member) is connected. By removing the male screw member 51 (second male screw member) from the two female screw members), the PC steel rod 50 (third rod-shaped member) can be removed from the construction base material 10.

[Structure construction method]
Next, the construction method of the structure performed by attaching the spacer and the packer to the foundation material for construction will be described. The construction target to be constructed by installing the foundation material for construction is, for example, a structure such as a retaining wall, a ground, or an embankment (for example, a soil structure using soil).

4 to 7 are views showing an example of a construction method (for example, reinforcement of the retaining wall) in which the existing retaining wall and the back ground are stabilized by using the construction foundation material 100 equipped with the spacer and the packer. is there. Since the structure of the construction foundation material 100 is substantially the same as that of the construction foundation material 10 shown in FIGS. 1 to 3, the parts common to the construction foundation material 100 are the same as those of the construction foundation material 10. These explanations will be omitted with reference to.

[PC steel rod mounting process]
As shown in FIG. 4 (1), the spacer 101 is attached to the outer circumference of the rod 20 of the construction foundation material 100 (near the center in the axial direction of the rod 20). Here, the spacer 101 is a guide member used for positioning when the construction foundation material 100 is inserted into the installation hole. For example, the spacer 101 is made of a soft spring plate or the like. Further, the PC steel rod 50 is rotated to screw the male screw member 51 of the PC steel rod 50 into the female screw portion 41, and the PC steel rod 50 is connected to the construction base material 100.

[Packer installation process]
Next, as shown in FIGS. 4 (2) and 4 (3), the packer 102 is attached to the outer circumference of the rod 20 of the construction base material 100 (near the opening of the rod 20). In addition, in FIG. 4 (3), the inside of the dotted line of FIG. 4 (2) is enlarged and shown.

Here, the packer 102 is for injecting grout, cement milk, or the like to close the outlet of the installation hole of the construction foundation material 100 (the outlet of the outer periphery of the rod 20 of the installation hole). As the packer 102, for example, a cloth packer can be used. Further, by attaching the packer 102 to close the outlet of the installation hole of the construction foundation material 100, pressure injection can be performed on the construction foundation material 100.

Specifically, as shown in FIG. 4 (3), a packer 102 is attached to the outer circumference of the rod 20 of the construction base material 100, both ends of the packer 102 are fixed with butyl rubber tape 103, and the butyl rubber tape 103 is attached with a binding band 104. Tied up. Further, a packer injection pipe 106 for injecting grout, cement milk, etc. into the packer 102 is put out to the outside of the rod 20. Further, when injecting grout or the like into the rod 20 of the construction foundation material 100, a grout confirmation pipe 107 for confirming the grout is installed in the rod 20 and a part of the grout confirmation pipe 107 is put out to the outside of the rod 20. The mounting method of the packer 102 shown in FIG. 4 (3) is an example, and the packer 102 may be mounted on the outer periphery of the rod 20 of the construction foundation material 100 by another mounting method.

[Installation process of foundation material for construction]
First, an installation hole 110 is excavated at an installation location (placement position) where the construction foundation material 100 is installed. Here, as shown in FIG. 5 (1), in order to insert the buckling member 30 (enlarged portion) of the construction foundation material 100 to a position determined by design, the diameter of the installation hole 110 is the buckling member. It is necessary to make the diameter of 30 (enlarged portion) or more. Then, as shown in FIG. 5 (1), the construction foundation material 100 is inserted into the installation hole 110.

[Attachment process of hydraulic jack, buckling process of buckling member (expansion process)]
Next, as shown in FIG. 5 (2), the hydraulic jack 111 (for example, the center hole type hydraulic jack) is set on the PC steel rod 50 and the expansion adapter 22 of the construction foundation material 100. Then, as shown in FIG. 5 (3), the PC steel rod 50 is pulled in the direction of the arrow 112 by applying flood pressure to the hydraulic jack 111 in a state where the movement of the expansion adapter 22 (rod 20) is restricted. By pulling the PC steel rod 50 in the direction of the arrow 112 in this way, the steel pipe 40 connected to the PC steel rod 50 can be moved in the direction of the arrow 112. In response to the movement of the steel pipe 40, the first plate 60 and the third plate 80 fixed to the fixing member 43 of the steel pipe 40 move to the second plate 70 and the fourth plate 90 side, and by this movement, the first plate 60 is moved. The five first buckling members 31 between the plate 60 and the second plate 70 and the five second buckling members 35 between the third plate 80 and the fourth plate 90 are compressed into a dogleg shape. Buckled like a shape. Then, the five first buckling members 31 and the five second buckling members 35 are buckled to a predetermined shape.

[Rod screwing process, PC steel rod removal process]
Next, as shown in FIG. 6 (1), the rod 20 is rotated by using a tool (for example, a pipe wrench) 113, and the male screw member 21 of the rod 20 is screwed into the female screw portion 42 of the steel pipe 40. , The buckling member 30 is connected to the rod 20 via the steel pipe 40. Next, as shown in FIG. 6 (2), the PC steel rod 50 is rotated by using a tool (for example, a T-type wrench) 114 to remove the PC steel rod 50 from the construction base material 100. By each of these steps, the installation of the construction foundation material 100 is completed (shown in FIG. 6 (3)). Subsequently, the grout injection step is started.

[Air blow and grout injection preparation process]
In the grout injection step, first, air blow and grout injection preparation are performed. Specifically, as shown in FIG. 7 (1), the grout injection adapter (male side) 121 is attached to the end of the rod 20 on the opening side, and the injection adapter (female side) 122 is attached to a hose (air hose and grout hose). ) 123, and the injection adapter (female side) 122 is attached to the grout injection adapter (male side) 121.

[Air blow spraying process]
Next, as shown by arrow 124 in FIG. 7 (2), an air blow is blown from the grout injection adapter 121 attached to the rod 20 of the construction foundation material 100 using an air compressor. By spraying this air blow, after air flows from the opening of the rod 20 to the tip of the construction base material 100 inside the rod 20, as shown by the arrows in the installation hole 110 shown in FIG. 7 (2). On the outside of the rod 20, air flows from the tip of the construction base material 100 to the opening of the installation hole 110 and is discharged to the outside of the installation hole 110. Further, by blowing air from the through hole 25 shown in FIG. 7 (2), air is also blown out in the vicinity of the buckling member 30.

[Grout injection process into packer]
Next, as shown in FIG. 7 (3), grout is injected into the packer injection tube 106. By injecting the grout, the packer 102 swells and can close the outlet near the opening of the installation hole 110 (outside near the opening of the rod 20). By inflating the packer 102 and closing the outlet (outside of the rod 20) near the opening of the installation hole 110 in this way, pressure injection into the construction base material 100 can be performed.

[Grout injection process into foundation material for construction]
Next, as shown in FIG. 7 (4), grout is injected from the grout injection adapter 121 attached to the rod 20 of the construction foundation material 100. By injecting the grout, after the grout is supplied from the opening of the rod 20 to the tip of the construction base material 100 inside the rod 20, as shown by the arrows in the installation hole 110 shown in FIG. 7 (4). , Grout flows from the tip of the construction base material 100 to the vicinity of the opening of the installation hole 110 on the outside of the rod 20. Further, the grout is supplied to the vicinity of the buckling member 30 by blowing out the grout from the through hole 25 shown in FIG. 7 (4). However, since the outlet (outside of the rod 20) near the opening of the installation hole 110 is blocked by the packer 102, the grout is not discharged to the outside of the installation hole 110.

[Pressure injection process]
Next, as shown in FIG. 7 (5), after confirming the return of the grout using the grout confirmation pipe 107, the grout confirmation pipe 107 is closed. Then, grout is further injected from the grout injection adapter 121 attached to the rod 20 of the construction foundation material 100, and pressure injection is performed until the pressure in the installation hole 110 reaches a predetermined pressure.

By sequentially performing each of the steps shown above, the construction of the structure using the foundation material 100 for construction is performed. Other steps are also performed depending on the structure (for example, retaining wall, ground, embankment), but the description thereof is omitted here. For example, when performing construction to stabilize the existing retaining wall and the back ground, the existing retaining wall is formed by inserting and fixing the construction foundation material 100 having the buckling member 30 (tip enlarged portion) from the surface of the retaining wall. It can be reinforced as it is.

In this way, it is a construction method of the tip expansion type construction foundation material 100 (reinforcing material) whose tip expands in the soil, and is a PC steel rod screw-joined to the tip of the buckling member 30 (tip expansion portion). The buckling member 30 (tip enlargement portion) buckles by pulling 50, and the buckling member 30 (tip enlargement portion) expands to a predetermined diameter, and the tensile force acting on the rod 20 is applied to the buckling member 30 (tip enlargement portion). A method of constructing a tip expansion type construction foundation material 100 (reinforcing material) having a joining step of screwing a rod 20 to a buckling member 30 (tip expansion portion) after expansion in order to transmit to the tip expansion portion). It can be realized. Further, it is possible to realize a construction method in which the grout is pressurized and injected into the buckling member 30 (tip enlarged portion) by using the hollow rod 20.

As described above, in the construction foundation material 100, the buckling member 30 can be expanded by using the PC steel rod 50 that is slidably inserted into the hollow rod 20. Therefore, it is not necessary to use the reaction force pipe (or jig), and the work of pulling out the reaction force pipe from between the installation hole and the rod becomes unnecessary, and the workability can be improved. Further, after buckling (after expansion) of the first buckling member 31 and the second buckling member 35 of the buckling member 30 (enlarged portion) in a dogleg shape (after expansion), the buckling member 30 is passed through the steel pipe 40. The (enlarged portion) and the rod 20 can be connected (the male screw member 21 of the rod 20 and the female screw member 41 of the steel pipe 40 are screwed together). That is, the tip portion of the buckling member 30 (enlarged portion) after buckling (after expansion) and the rod 20 can be fixed. As a result, with respect to the pulling force generated in the rod 20, the buckling member 30 (enlarged portion) is not subjected to a tensile force but a compressive force (the tip end side connected to the rod 20 (the tip of the buckling member 30). The force pushed from the part side) acts. Therefore, the load bearing capacity of the buckling member 30 (enlarged portion) can be increased.

Further, since it is not necessary to use the reaction force pipe, it is not necessary to attach the reaction force pipe to the outer circumference of the rod 20. Therefore, the spacer 101 and the packer 102 can be attached to the outer circumference of the rod 20. By attaching the spacer 101, which is a guide member, to the outer circumference of the rod 20 in this way, it is possible to reliably secure the grout covering thickness on the outer circumference of the rod 20.

Further, by attaching the packer 102 to the outer circumference of the rod 20, the outlet near the opening of the installation hole 110 (outside near the opening of the rod 20) can be closed, so that the grout can be prevented from being dissipated. For example, it is possible to prevent the dissipation of grout in the water permeable layer on the back surface of the retaining wall. By attaching the packer 102 to the outer circumference of the rod 20 in this way, reliable grout injection becomes possible.

Further, by attaching the packer 102 to the outer circumference of the rod 20, the outlet near the opening of the installation hole 110 (outside near the opening of the rod 20) can be closed, so that the grout is added to the construction base material 100. Pressure injection is possible. By attaching the packer 102 to the outer circumference of the rod 20 in this way, the grout filling property of the construction base material 100 can be improved.

It is clear that the present invention is not limited to the above-described embodiment, and various changes can be made within the scope of its technical idea.

1,111 Hydraulic jack 10,100 Construction base material 20 Rod 21, 51 Male thread member 22 Expansion adapter 25, 60a, 60b, 70a, 70b, 80a, 80b, 90a, 90b Through hole 30 Buckling member 31 First seat Bending material 32 to 34 Notch 35 2nd buckling material 40 Steel pipe 41, 42 Female thread member 50 PC steel rod 60 1st plate 70 2nd plate 80 3rd plate 80c, 90c Groove 90 4th plate 101 Spacer 102 Packer 103 Butyl rubber tape 104 Bundling band 105 Paper tape 106 Packer injection pipe 107 Graut confirmation pipe 113, 114 Tools 121 Graut injection adapter 122 Injection adapter 123 Hose

Claims (4)

A anchor member of rod-like to be Da設the soil structure using the soil,
Hollow cylindrical first rod-shaped member and
A hollow cylindrical rod-shaped member arranged closer to the tip end side of the anchor member in the driving direction than the first rod-shaped member, and a part of the tip end side of the first rod-shaped member in the driving direction is slidable. The second rod-shaped member to be inserted into
A rod-shaped member that can be removed from the anchor member after the anchor member is placed on the soil structure, and is slidably inserted into the first rod-shaped member and the second rod-shaped member. 3rd rod-shaped member and
A plurality of buckling members which are rod-shaped members arranged so as to extend in the driving direction on the outer circumference of the first rod-shaped member, and a disk-shaped plate for fixing one end of each of the plurality of buckling members. A first plate-shaped member having a hole in the center thereof and a disk-shaped plate-shaped member fixing the other ends of the plurality of buckling members with a hole in the center. A buckling member having a second plate-like member provided with a
The second plate-shaped member is installed on the rear end side in the driving direction with respect to the first plate-shaped member.
The second rod-shaped member is inserted into the hole of the first plate-shaped member, and the first plate-shaped member is formed on the outer periphery of the second rod-shaped member near the rear end portion in the driving direction in the driving direction. It is fixed so that it does not move to the tip side,
The first rod-shaped member is inserted into the hole of the second plate-shaped member, and the second plate-shaped member is fixed on the outer circumference of the first rod-shaped member so as not to move to the rear end side in the driving direction. ,
The first rod-shaped member includes a first male screw member on the outer periphery of the tip portion in the driving direction.
The second rod-shaped member includes a first female screw member screwed into the first male screw member on the rear end side of the inner circumference of the tip portion in the driving direction, and a second female screw member on the tip side of the inner circumference. Equipped with a female screw member,
The third rod-shaped member includes a second male screw member screwed into the second female screw member on the outer periphery of the tip portion in the driving direction.
In the plurality of buckling members, the third rod-shaped member is moved to the side opposite to the driving direction in a state where the second male screw member is screwed into the second female screw member. By reducing the distance between the one plate-shaped member and the second plate-shaped member, the first plate-shaped member and the second plate-shaped member are compressed and buckled in a dogleg shape.
Anchor member. After the plurality of buckling members are buckled in a dogleg shape, the tip portion of the first rod-shaped member and the second rod-shaped member are screwed by screwing the first male screw member into the first female screw member. together to couple a distal end of the rod, the anchor according to take out to請Motomeko 1 the third rod-like member from the anchor member by the second female screw member detaching the second male threaded member part material. Before Stories second plate member, in a case where the plurality of seats屈材is buckled state, the length from the tip of the anchoring member, the axial length of the second rod-like member, said plurality of and the axial length of the anchor member of the buckling member in the buckling of the seat屈材, the sum of, according to請Motomeko 1 or 2 Ru is fixed at a position in the outer periphery of the first rod-like member anchor member. Using an anchor member according to any one of claims 1 to 3, a construction method of earth structure using the soil,
The end side outer periphery after the punching arrangement direction of said anchor member, and a mounting step of mounting a packer for injecting a predetermined liquid,
Said anchor member after inserting the installation hole of the soil structure, in a state in which the second male screw member into the second female screw member is screwed, and the punching arrangement direction of the third rod-like members Is moved to the opposite side to reduce the distance between the first plate-shaped member and the second plate-shaped member, and the plurality of bucklings are performed between the first plate-shaped member and the second plate-shaped member. A buckling process in which the material is buckled in a dogleg shape and bites into the soil structure.
The first rod-shaped member is rotated around the axial direction of the anchor member, and the first male screw member is screwed into the first female screw member to form a tip portion of the first rod-shaped member and the second rod-shaped member. After connecting to the tip of the member, the third rod-shaped member is rotated around the axial direction of the anchor member to remove the second male screw member from the second female screw member, and the third rod-shaped member is removed. A removal step of moving the member to the side opposite to the driving direction and removing the third rod-shaped member from the anchor member.
By injecting the predetermined liquid to the packer to inflate the packer, and packer implantation step for closing the portion other than the anchor member at the opening of the front Symbol installation hole,
After opening of the installation hole is blocked by the packer, the grouting step of pressure injecting grout into the anchor member,
Construction method of soil structures that have a.

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