JP5902454B2 - Bag body fixing tool and natural ground reinforcing material using the same - Google Patents

Description

  The present invention relates to a bag fixing tool used when a bag body for reinforcing natural ground is fixed to a core material, and a natural ground reinforcing material using the same.

  In the ground anchor method, a slope structure such as a slope frame arranged on a slope and an anchor fixed on a ground extending behind the slope are interconnected via a tension member and tension is applied to the tension member. The tension force introduced into the tensile material acts on the slope via the slope structure, increasing the shear resistance of the natural ground and preventing its collapse in advance. It becomes.

  On the other hand, the nailing method is to insert a reinforcing bar as a core material into a natural ground and fill the grout material between its surroundings and the natural ground, and fix the reinforcing bar to the natural ground over its entire length. The deformation when the natural ground is about to move is constrained by the shearing, bending or tensile rigidity of the reinforcing bars, and the slope can be prevented from falling and stabilized as in the case of the ground anchor method.

  On the other hand, the core material and the bag body arranged so as to surround the core material are inserted into the reinforcing material insertion hole formed in advance in the ground, and then the circumferential surface of the bag body contacts the inner surface of the reinforcing material insertion hole. A construction method is known in which a grout material is pressure-injected into the bag so as to come into contact with the bag (Patent Document 1).

  In such a construction method, the circumferential surface of the bag body comes into contact with the inner surface of the drilling hole so as to expand the reinforcing material insertion hole as the grout is inflated by injecting the grout. Integrate.

  In other words, this method constrains deformation of the natural ground in the form of fixing force to the natural ground over the entire length of the core material plus the fixing force due to the expansion of the bag body. As you can see from the name of), it is highly expected as a new construction method with much better fixing power than the conventional nailing method.

JP 2006-188845 A JP 2009-191582 A

  In attaching the bag body to the core material, the core material is inserted into the tube-shaped bag body, and both ends of the bag body are squeezed and fixed to the core material. If the leakage occurs from between the both ends of the bag body and the core material, the bag body cannot be expanded, and as a result, the reinforcing material insertion hole cannot be expanded.

  Therefore, conventionally, the water tightness of both was ensured by tightly binding the vicinity of the edge of the end of the bag body to the core with a steel restraining band or wire (Patent Document 2).

  However, if the grout pressure in the bag body is increased in order to increase the fixing force to the natural ground due to the spreading action of the bag body, the restraint band that has bound the vicinity of the edge of the bag body as the internal pressure of the bag body increases. As a result, there is a problem that the wire and the wire are loosened and the binding portion may be displaced in the axial direction of the core material or the bag body may be damaged.

  Such a problem leads to a situation in which the grout material leaks from the place where the looseness occurs or the damaged place, the injection pressure decreases, and the bag body cannot be expanded as planned.

  The present invention has been made in consideration of the above-described circumstances, and is a bag fixing tool capable of preventing leakage of grout material from the end portion of the bag body even when the internal pressure of the bag body increases, and a natural ground using the same. The object is to provide a reinforcing material.

In order to achieve the above object, the bag fixing device according to the present invention fixes the end portion of the bag body formed in a tube shape to the core member inserted and arranged in the bag body as described in claim 1. In the bag fixing tool in which the inner space into which the grout material is injected is formed in the bag body,
A first narrowing member having a core material insertion hole through which the core material is inserted, and a core material that is disposed closer to the bag body than the first narrowing member and through which the core material is inserted. A second narrowing member in which an insertion hole is formed, and a peripheral edge of the bag body through which the core member is inserted in a state of being disposed between the first narrowing member and the second narrowing member In the state where the core member is inserted through the core member insertion hole and the annular member through which the core member is inserted, and the first narrow member and the second narrow member on the core of the core member along and a mechanism was freely attracting attracting each other, of the first sandwiching bond member and the second sandwiching bond member, either of the sandwiching bond members together configured to enable fixed to the core member The other narrowing member can be attracted to the one narrowing member in such a manner that the pulling mechanism takes a reaction force from the one narrowing member. Configured, the first sandwiching bond member, the second sandwiching bond member and the annular member, the other end and the second narrow end and the annular member of the first sandwiching bond member and the annular member The attachment members are configured to be in contact with each other via the peripheral edge of the end portion of the bag body.

  In the bag fixing device according to the present invention, the pulling mechanism is screwed into the male screw extending from one of the first narrowing member and the second narrowing member, and the male screw. It is comprised with the internal thread arrange | positioned or formed in the other of the said 1st narrowing member and the said 2nd narrowing member.

  In the bag fixing device according to the present invention, the male screw is configured by a bolt, and the bolt insertion hole through which the bolt is inserted is either one of the first narrowing member and the second narrowing member. The female screw hole into which the bolt is screwed is formed as the female screw on the other side.

  Moreover, the bag fixing tool which concerns on this invention provides the adhesive filling hole connected to the said core material penetration hole in the said 1st narrowing member or the said 2nd narrowing member.

  Further, the bag fixing device according to the present invention includes a wedge abutting surface formed in the vicinity of the opening in the inner peripheral surface of the core member insertion hole, and a wedge member abutted against the wedge abutting surface. It is a thing.

  Further, the bag body fixing device according to the present invention is configured such that the annular member is sandwiched between the first narrowing member and the second narrowing member via the peripheral edge of the bag body. The first narrowing member and the second narrowing member are formed between the first narrowing member and the second narrowing member so that a putty filling space is formed inside the peripheral edge of the bag body. The landing member and the annular member are configured.

    Further, the bag fixing device according to the present invention is a restraint configured to be able to wrap around the annular member in a state in which the folded portion at the peripheral edge of the bag body is in contact with the outer peripheral surface of the annular member. It is equipped with a band.

  Further, the bag fixing tool according to the present invention is provided in the first narrowing member and the second narrowing member so that a pipe insertion hole through which a grout injection pipe is inserted is parallel to the core material insertion hole. Each is provided.

  In addition, the ground reinforcing material according to the present invention is, as described in claim 9, a PC steel strand for the core material to be fixed by the bag fixing device according to any one of claims 1 to 8. It is what.

  Moreover, the natural ground reinforcing material which concerns on this invention coat | covers the front-end | tip exposed part extended from a said 1st narrowing member among the said PC steel strands with the cap for core material coating | cover.

  In order to fix the end portion of the bag body to the core member using the bag body fixing tool according to the present invention, either the first narrow member or the second narrow member, for example, the second narrow member After the attachment member is inserted into the core member and positioned at an appropriate position, the second narrow attachment member is fixed to the core member.

  At this time, with respect to the other member, in the above-described example, the first narrowing member, or the annular member disposed between the first narrowing member and the second narrowing member, the second narrowing The core member may be inserted through the core material in advance, or if there is no problem with the subsequent process, the second narrowing member may be fixed to the core material and then inserted into the core material. . Further, when both ends of the bag body are fixed to the core member by the bag body fixing tool according to the present invention, the first set of the first narrowing member, the second narrowing member, the annular member and the second set The first narrowing member, the second narrowing member, and the annular member may be inserted into the core member together, or if there is no hindrance to insertion into the core member, a set described below After the eye fixing work is finished, the second set of the first narrowing member, the second narrowing member, and the annular member may be inserted into the core member.

  Next, the edge part edge periphery of a bag body is penetrated inside an annular member. During such work, the other of the first narrowing member and the second narrowing member can be appropriately retracted from one or the annular member as necessary.

  Next, in a state where the core member is inserted into the first narrowing member, the second narrowing member, and the annular member disposed therebetween, the first narrowing member and the second narrowing member are drawn using the pulling mechanism. The two narrow members are drawn together.

  In this case, one of the first narrowing member and the second narrowing member, in the above example, the second narrowing member is fixed to the core member, and the first narrowing member which is the other member. Since the member is not fixed to the core material, in this example, the first narrowing member is drawn to the second narrowing member side by using the second narrowing member as a reaction force, One narrow member and one end of the annular member, and the other end of the annular member and the second narrow member are in contact with each other via the peripheral edge of the end of the bag.

  The natural ground reinforcing material assembled in this way is inserted into the reinforcing material insertion hole formed in the natural ground, and then the bag body is placed so that the circumferential surface of the bag body comes into contact with the reinforcing material insertion hole. The grout material is injected into the internal space, and the bag body expands due to the internal pressure of the grout material at that time. However, in the bag body fixing device and the natural ground reinforcing material using the same according to the present invention, the end of the bag body The periphery of the portion extends from the second narrowing member side to the first narrowing member side through the inside of the annular member, or in the folded state, from the first narrowing member side to the annular member. The first narrowing member and the second narrowing member extend toward each other via the pulling mechanism while extending toward the second narrowing member through the inside.

  Therefore, the peripheral edge of the end of the bag body will be tightly attached between the first narrowing member and one end of the annular member, and the other end of the annular member and the second narrowing member, respectively. The end portion is firmly fixed to the core member via the first narrowing member, the second narrowing member, and the annular member.

  In addition, since the annular member is pressed against the second narrowing member and the first narrowing member, even when the internal pressure of the bag body is zero or small, the end portion of the bag body and the core member Therefore, the leakage of the grout material immediately after the start of the grout injection is prevented.

  Further, in the case where the end edge of the bag body is arranged to extend from the second narrowing member side to the first narrowing member side through the inside of the annular member, the bag body by injecting the grout material described above When the bag body expands due to an increase in internal pressure, the peripheral edge of the bag body expands and the annular member attempts to move outward. The annular member is such that the first narrowing member is directly fixed to the core member. In addition, since it is indirectly fixed to the core member via the pulling mechanism and the second narrowing member, the movement is limited in such a way as to receive a reaction force from the first narrowing member.

  Therefore, the peripheral edge of the end of the bag body is more firmly narrowed between the annular member and the first narrowing member, and thus the end of the bag body and the core material are increased by the increase in internal pressure of the bag body. The end of the bag body is damaged or the end portion of the bag body is damaged, and the grout material is not likely to leak due to the damage.

  The pulling mechanism can be configured arbitrarily as long as the first narrowing member and the second narrowing member can be relatively pulled along the material axis of the core material. A male screw extending from one of the narrowing member and the second narrowing member and a female screwed into the male screw and disposed or formed on the other of the first narrowing member and the second narrowing member It can consist of screws.

  In this case, the male screw has a configuration in which the base end side is fixed to one of the first narrowing member and the second narrowing member, and the insertion hole through which the male screw is inserted is the first narrowing. A female screw is formed by a nut member that is formed on the other of the member and the second narrowing member and is screwed to the tip thereof, or a male screw is used for the first narrowing member and the second narrowing member. The bolt is inserted into a bolt insertion hole provided on one side, and the bolt insertion hole through which the bolt is inserted is formed on the other of the first and second narrowing members, and at the tip thereof A configuration in which a female screw is configured by a nut member to be screwed can be employed, but the male screw is inserted into a bolt insertion hole formed in one of the first narrowing member and the second narrowing member. And a female screw hole into which the bolt is screwed. If this by forming the other member and the second sandwiching bond member to the female screw, it is possible to reduce the number of parts.

  Which of the first narrowing member and the second narrowing member is fixed to the core material is arbitrary, and the means for fixing to the core material is also arbitrary. For example, the first narrowing member and the second narrowing member For example, four screws are set every 90 ° or three screws are set so that the tips are screwed into the peripheral surface of the core member from the outer peripheral surface thereof in the direction perpendicular to the material axis. It is possible to adopt a method of penetrating at every degree, but an adhesive filling hole communicating with the core material insertion hole is provided in the first narrowing member or the second narrowing member, and the adhesive filling hole is provided through the adhesive filling hole. If the gap between the inner peripheral surface of the core material insertion hole formed in the first narrow member or the second narrow member and the peripheral surface of the core material is filled with an adhesive such as epoxy resin, It becomes possible to firmly fix the first narrowing member or the second narrowing member to the core material. In addition, a wedge contact surface is formed in the vicinity of the opening in the inner peripheral surface of the core material insertion hole, and a wedge member is provided to contact the wedge contact surface, and the wedge member is provided in the opening of the core material insertion hole. If it is made to drive between the core material and the core material, as in the case of the adhesive, the first narrowing member or the second narrowing member can be firmly fixed to the core material.

  As described above, the first narrowing member, the second narrowing member, and the annular member are the first narrowing member, one end of the annular member, the other end of the annular member, and the second narrowing member. However, it is sufficient that the ring member is configured to be in contact with each other via the peripheral edge of the bag, but the annular member is sandwiched between the first narrowing member and the second narrowing member via the peripheral edge of the bag. In such a state, if they are configured so that a putty filling space is formed between the first narrowing member and the second narrowing member and inside the peripheral edge of the bag body, the bag body It becomes possible to more reliably prevent leakage of the grout material from the end portion.

  In the case where it is arranged to extend from the first narrowing member side to the second narrowing member side through the inner side of the annular member in the state where the end peripheral edge of the bag body is folded back, If the restraint band configured to be able to be wound around the annular member in a state in which the folded portion is in contact with the outer peripheral surface of the annular member, an increase in the internal pressure of the bag body due to the injection of the grout material described above When the bag body is expanded by the restraint band, the annular member integrated with the edge peripheral edge of the bag body tries to move outward together with the edge peripheral edge of the bag body. Since the narrowing member is directly fixed to the core member or indirectly fixed to the core member via the pulling mechanism and the second narrowing member, a form receiving a reaction force from the first narrowing member The movement is restricted.

  Therefore, the peripheral edge of the end of the bag body is more firmly narrowed between the annular member and the first narrowing member, and thus the end of the bag body and the core material are increased by the increase in internal pressure of the bag body. The end of the bag body is damaged or the end portion of the bag body is damaged, and the grout material is not likely to leak due to the damage.

  The bag fixing tool according to the present invention can be applied to both the case where the grout injection pipe for injecting the grout material into the bag body is also used as the core material and the case where the grout injection pipe is individually provided. The pipe insertion hole into which the grout injection pipe is inserted may be provided in each of the first narrowing member and the second narrowing member so as to be parallel to the core member insertion hole.

  In the natural ground reinforcing material using the bag fixing device according to the present invention, when the core material and the grout injection pipe are separately provided, the core material can be made of a PC steel wire in particular. According to the present invention, it is possible to reinforce the natural ground by sufficiently exhibiting the tensile strength characteristics of the PC steel wire.

  Here, in the PC steel strand, if the tip exposed portion extending from the first narrowing member is covered with the core material covering cap, the grout material can be prevented from leaking from the gap between the wires of the PC steel. Can be prevented.

It is a figure of the natural ground reinforcement 1 using the bag fixing tool 6 which concerns on this embodiment, (a) is a general view, (b) is a layout. The assembly perspective view of the bag fixing tool 6. FIG. FIG. 4 is an assembly cross-sectional view of the bag fixing tool 6. Sectional drawing which showed the use procedure of the bag fixing tool 6 which concerns on this embodiment. Sectional drawing which showed the use procedure of the bag fixing tool 6 which concerns on this embodiment continuously. Sectional drawing which showed the bag fixing tool which concerns on a modification. The assembly sectional view showing the bag fixing tool concerning a modification. The assembly sectional view showing the bag fixing tool concerning a modification. Sectional drawing which showed the bag fixing tool which concerns on a modification. It is the figure which showed the bag fixing tool which concerns on a modification, (a) is sectional drawing, (b) is the arrow line view seen from the AA line direction.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a bag fixing tool and a natural ground reinforcing material using the same according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall view and a layout view of a natural ground reinforcing material assembled using a bag fixing tool according to the present embodiment. As shown in FIG. 1A, the ground reinforcing material 1 according to the present embodiment is a core material that is a strand of PC steel in which both end portions of a bag-shaped bag body 3 are inserted into the bag body. 2 is fixed to each other through the bag body fixing tools 6 and 6 so that an internal space 4 is formed inside the bag body, and as shown in FIG. By injecting the grout material into the internal space 4 of the bag body 3 in a state of being inserted into the reinforcing material insertion hole 7 formed in 8, the bag body can be expanded and the reinforcing material insertion hole 7 can be expanded. It is like that.

  As shown in FIGS. 2 and 3, the bag body fixing tool 6 includes a narrowing member 11 as a first narrowing member, and a second narrowing member disposed closer to the bag body 3 than the narrowing member. It is comprised by the narrow member 12 as a member, the annular member 13 arrange | positioned among them, and the four volt | bolts 14 as a drawing mechanism.

  The narrow member 11 is formed in a substantially cylindrical shape as a whole, and a core material insertion hole 27 through which the core material 2 is inserted is formed in the center of the cross section along the material axis, and the bolt 14 is inserted. A total of four bolt insertion holes 26 are formed so as to surround the core material insertion hole 27.

  The entire narrow member 12 is formed in a substantially cylindrical shape, and a core material insertion hole 20 through which the core material 2 is inserted is formed at the center of the cross section along the material axis, and the tip of the bolt 14 is screwed. A total of four female screw holes 21 are formed so as to surround the core material insertion hole 20.

  The annular member 13 is configured such that the core member 2 is inserted in a state where the annular member 13 is disposed between the narrowing member 11 and the narrowing member 12, and a taper formed in the narrowing member 11 is provided at one end periphery thereof. A tapered contact surface 23 that is in contact with the contact surface 22 of the bag 3 via the peripheral edge of the end portion of the bag body 3 is formed, and a taper formed on the narrowing member 12 is formed on the peripheral edge of the other end. A tapered contact surface 25 that is in contact with the contact surface 24 via the edge of the end of the bag body 3 is formed.

  The bolt 14 was inserted into the bolt insertion hole 26 of the narrowing member 11 in a state where the narrowing member 11 and the narrowing member 12 face each other with their tapered surfaces 22 and 24 sandwiching the annular member 13. In addition, the narrow end members 11 and 12 can be pulled toward each other along the material axis of the core member 2 by screwing the distal end thereof into the female screw hole 21 of the narrow member 12.

  Here, the narrowing member 12 is provided with an adhesive filling hole 29 communicating with the core material insertion hole 20, and the inner peripheral surface of the core material insertion hole 20 and the core material 2 are connected via the adhesive filling hole. The narrowing member can be fixed to the core member 2 by filling the gap with the peripheral surface with an adhesive such as epoxy resin.

  Next, of the end portions of the bag body 3, the end portion on the side close to the front end of the core member 2 (the left end portion in FIG. The procedure of using and fixing to the core material 2 will be described below. In addition, when the same is fixed to the core material 2 using the bag fixing tool 6 also on the side far from the tip of the core material 2, that is, the right side edge portion in FIG. 1 (a), the arrangement structure is symmetrical. Since it is the same as the case of the left end portion except for the points, only the left end portion of the bag body 3 will be described here, but those constituent members, that is, the narrow member 11, the narrow member 12 and the annular member 13 are described. Is inserted through the core material 2 in advance.

  In order to fix the left end portion of the bag body 3 to the core material 2 using the bag body fixing tool 6, first, the core material 2 is inserted through the core material insertion hole 20 of the narrowing member 12, as shown in FIG. Then, the gap member 12 is filled with an adhesive such as an epoxy resin in the gap between the inner peripheral surface of the core material insertion hole 20 and the peripheral surface of the core material 2 through the adhesive filling hole 29, thereby fixing the narrow member 12 to the core material. It adheres to 2.

  Next, the annular member 13 is inserted into the core member 2, and the end periphery 61 of the bag body 3 extends from the narrowing member 12 to the narrowing member 11 described later through the inside of the annular member 13. The peripheral edge of the part is inserted inside the annular member 13.

  Next, as shown in FIG. 5, the core material 2 is inserted into the core material insertion hole 27 of the narrowing member 11, and then the bolt 14 is inserted into the bolt insertion hole 26 of the narrowing member 11. Through the internal space, the tip of the bolt reaches the female screw hole 21 of the narrowing member 12 and is screwed into the female screw hole.

  In this way, since the narrowing member 12 is fixed to the core member 2, the narrowing member 11 is drawn to the narrowing member side by using the narrowing member 12 as a reaction body as shown by the arrow in FIG. The tapered contact surface 22 formed on the narrowing member 11, the tapered contact surface 23 formed on one edge of the annular member 13, and the tapered contact surface formed on the narrowing member 12. The surface 24 and the tapered contact surface 25 formed at the peripheral edge of the other end of the annular member 13 are in contact with each other via the end peripheral edge 61 of the bag body 3.

  The natural ground reinforcement 1 assembled in this way is inserted into the reinforcing material insertion hole 7 formed in the natural ground 8 described with reference to FIG. The grout material is injected into the inner space 4 of the bag body so as to come into contact with the bag body 3 and the bag body 3 expands due to the internal pressure of the grout material at that time. In the reinforcing member 1, the edge periphery 61 of the bag 3 extends from the narrow member 12 side to the narrow member 11 side through the internal space of the annular member 13, and the narrow member 12 and the narrow member 12. The landing members 11 are attracted to each other via bolts 14.

  Therefore, the end edge 61 of the bag 3 is tightly attached between the narrowing member 11 and one end of the annular member 13 and between the other end of the annular member 13 and the narrowing member 12.

  Further, when the bag body further expands due to the increase in the internal pressure of the bag body 3 due to the injection of the grout material described above, the end edge 61 of the bag body 3 expands, and the annular member 13 moves to the left in FIG. However, since the narrowing member 11 is fixed to the core member 2 via the bolt 14 and the narrowing member 12, the annular member 13 receives the reaction force from the narrowing member 11, and its movement is Limited.

  On the other hand, since the annular member 13 is always pressed against the narrow members 11 and 12, even if the internal pressure of the bag body 3 is zero or small, the end of the bag body 3 and the core material 2 There is no risk of loosening.

  As described above, according to the bag fixing tool 6 and the ground pile reinforcing material 1 using the same according to the present embodiment, the end periphery 61 of the bag 3 is one end of the narrowing member 11 and the annular member 13. , And between the other end of the annular member 13 and the narrowing member 12, the end of the bag 3 is interposed via the narrowing member 11, the narrowing member 12, and the annular member 13. Thus, the core material 2 is firmly fixed, and there is no possibility that the injected grout material leaks out of the bag 3.

  Further, when the bag body further expands due to an increase in the internal pressure of the bag body 3 due to the injection of the grout material, the movement toward the outside of the annular member 13 caused by the end peripheral edge 61 of the bag body 3 trying to expand (see FIG. 5 is limited by the narrowing member 11, the peripheral edge 61 of the bag body 3 is more firmly narrowed between the annular member 13 and the narrowing member 11. Therefore, the end of the bag body and the core member 2 are not fixed due to the increase in the internal pressure of the bag body 3, or the end portion of the bag body 3 is damaged due to this, and the grout material leaks due to the damage. The risk of doing so is eliminated.

  In addition, since the annular member 13 is always pressed against the narrowing members 11, 12, even if the internal pressure of the bag body 3 is zero or small, the end portion of the bag body 3 and the core material 2 There is no risk of loosening of the fixing, and thus it is possible to prevent leakage of the grout material immediately after the start of grout injection.

  Moreover, according to the bag fixing tool 6 and the natural ground reinforcing material 1 using the same according to the present embodiment, the adhesive filling hole 29 is provided in the narrowing member 12, and the narrowing member is interposed through the adhesive filling hole. Since the gap between the inner peripheral surface of the core material insertion hole 20 formed in 12 and the peripheral surface of the core material 2 is filled with an adhesive such as epoxy resin, the constricting member 12 is composed of a PC steel strand. The core material 2 can be firmly fixed to the core material 2 as a result, and as a result, the natural ground reinforcement that sufficiently exhibits the tensile strength characteristics of the core material 2 becomes possible.

  Although not particularly mentioned in the present embodiment, as shown in FIG. 6, in the state where the annular member 13 is sandwiched between the narrowing members 11 and 12 via the end peripheral edge 61 of the bag body 3, the narrowing member The putty 71 may be filled into a putty filling space formed between the end portions 61 of the bag body 3 between 11 and 12.

  In such a configuration, the grout material injected into the internal space 4 of the bag 3 can be more reliably prevented from leaking.

  Whether or not the putty 71 is filled is arbitrary, and the narrowing members 11 and 12 and the annular member 13 are configured so that a space for filling the putty 71 is formed between the narrowing members 11 and 12. For example, a configuration in which the putty filling space does not substantially occur, for example, a configuration in which the opposing end portions of the narrowing members 11 and 12 extend inside the annular member 13 can be employed. is there.

  In the present embodiment, the narrow member 12 is inserted into the core material 2 so that the narrow member 12 is closer to the bag body 3 and the narrow member 11 is farther from the bag body 3. It doesn't matter. In this modification, the same structure as the narrowing member 11 is the second narrowing member, and the same structure as the narrowing member 12 is the first narrowing member.

  Moreover, in this embodiment, the edge part peripheral edge 61 of the bag body 3 passes through the internal space of the annular member 13 from the narrow member 12 side arrange | positioned at the side close | similar to the bag body 3, and goes to the side far from the bag body 3. The peripheral edge of the end portion is inserted into the annular member 13 so as to extend toward the side of the narrowing member 11 arranged, but instead of this, as shown in FIG. The narrow member 11a is used as a second narrow member on the side close to the bag body 3, and the narrow member 12a having the same configuration as the narrow member 12 is used as the first narrow member on the side far from the bag body 3 respectively. 2 and the end periphery of the bag 3 so as to extend from the side of the narrowing member 12a to the side of the narrowing member 11a through the internal space of the annular member 13 in a state where the end peripheral edge 61 of the bag 3 is folded back. May be inserted through the annular member 13.

  Even in such a configuration, the peripheral edge 61 of the bag 3 is tightly attached between the narrowing member 11a and one end of the annular member 13 and between the other end of the annular member 13 and the narrowing member 12a. In addition, the point that the leakage of the grout material is prevented by this, and the point that the leakage of the grout material immediately after the start of the grout injection is prevented by always pressing the annular member 13 against the narrowing members 11a and 12a is the implementation described above. It is the same as the form.

  In addition, according to such a modification, the expansion surface of the bag body 3 when the grout material is injected is extended to a place closer to the tip of the core material 2, and thereby the reinforcing material insertion hole 7 formed in the natural ground 8. It is possible to increase the area of the bag body 3 that comes into contact with the ground, and thus the reinforcing action of the natural ground reinforcing material 1 can be enhanced.

  Here, as shown in FIG. 8, the folded portion 72 at the end peripheral edge 61 of the bag body 3 is brought into contact with the outer peripheral surface of the annular member 13, and the folded portion is wound around the annular member 13 with the restraining band 73 in this state. Then, when the bag body expands due to the increase in the internal pressure of the bag body 3 by the injection of the grout material described above, the annular member 13 integrated with the end peripheral edge 61 of the bag body 3 by the restraining band 73 is Although it tries to move outward in the left direction in FIG. 8 together with the peripheral edge of the body, since the narrowing member 12a is fixed to the core member 2, the annular member 13 receives a reaction force from the narrowing member 12a. The movement is limited in the form received.

  Accordingly, the end edge 61 of the bag body 3 is more tightly sealed between the annular member 13 and the narrowing member 12a. Thus, as in the above-described embodiment, the increase in the internal pressure of the bag body 3 The end portion of the bag body and the core material 2 are not fixed, or the end portion of the bag body 3 is damaged due to this, and there is no possibility that the grout material leaks due to the damage.

  Moreover, in this embodiment, although grout material injection | pouring to the internal space 4 formed in the bag body 3 was not demonstrated in detail, as shown to the fixing structure located in the right side of FIG. Instead, the narrow member 11b formed so that the pipe insertion hole 85 through which the grout injection pipe 84 is inserted is parallel to the core material insertion hole 27 is used as the first narrow member, and the narrow member 12 is used. Instead, the grout injection pipe 84 is formed by using the narrow member 12b formed so that the pipe insertion hole 86 through which the grout injection pipe 84 is inserted is parallel to the core material insertion hole 20 as the second narrow member. The grout material can be injected into the internal space 4 of the bag body 3 via the.

  Although not particularly mentioned in the present embodiment, as shown in the fixing structure located on the left side of FIG. 9, a core material covering cap 82 that covers the exposed end portion of the core material 2 may be provided. Good.

  In the modification shown on the left side of the figure, a narrowing member 11c formed by projecting a hollow male screw 81 on the narrowing member 11 is used in place of the narrowing member 11, and a core material covering cap is used. 82 has a bottomed cylindrical shape and has an internal thread 83 formed on its inner surface. By screwing the internal thread into the external thread 81, the exposed end of the core member 2 extending from the narrowing member 11c is watertight. Can be covered.

  The core material 2 is formed by twisting a plurality of PC steel wires, and a gap is formed between the PC steel wires. Depending on the viscosity of the grout material and other conditions, the PC steel wires Although there is a concern that the grout material may slightly leak from the gap, according to the above-described modification, it is possible to completely prevent the grout material from leaking even in such a case.

  Further, in the present embodiment and the above-described modification example, the first narrowing member or the second narrowing member is fixed to the core material with an adhesive such as an epoxy resin, but the first narrowing member or The second narrowing member can be fixed to the core by fixing means other than the adhesive, and for example, the configuration shown in FIG. 10 can be adopted.

  The bag fixing tool shown in the figure includes a narrowing member 92 as a first narrowing member, and a narrowing as a second narrowing member disposed closer to the bag 3 than the narrowing member. A member 11a, an annular member 13 disposed between them, and four bolts 14 as a pulling mechanism are provided, and the narrow member 92 is formed in a substantially cylindrical shape as in the narrow member 12. In addition, a core material insertion hole 20 through which the core material 2 is inserted is formed in the center of the cross section along the material axis, and a total of four female screw holes 21 into which the tips of the bolts 14 are screwed are surrounded by the core material insertion hole 20. Although formed, at the end of the inner peripheral surface of the core member insertion hole 20 on the side opposite to the side where the female screw hole 21 is formed, taper so that the inner diameter increases as it approaches the opening. And a wedge member 94 abutting on the wedge abutting surface is formed. There is a configuration in which a developing.

  The wedge member 94 is composed of three wedge pieces 93 having a conical shape as a whole when arranged around the core member 2, and is a jack (not shown) widely used for fixing a prestressed steel material. ) Is used to firmly fix the narrowing member 92 to the core material 2 in the same manner as the adhesive by driving into the gap between the wedge contact surface 95 of the core material insertion hole 20 and the peripheral surface of the core material 2. Can do.

  10 is similar to the modification of FIG. 7, the narrowing member 11 a passes through the internal space of the annular member 13 from the narrowing member 92 side in a state where the end edge 61 of the bag body 3 is folded back. The peripheral edge of the end portion is inserted into the annular member 13 so as to extend to the side of the ring member 13.

  Therefore, the expansion surface of the bag body 3 when the grout material is injected expands to a place closer to the tip of the core material 2, and the area of the bag body 3 that comes into contact with the reinforcing material insertion hole 7 formed in the ground 8 is large. Thus, the reinforcing effect of the natural ground reinforcing material 1 can be enhanced.

  In this modified example, similarly to the modified example described with reference to FIG. 8, the folded portion at the end peripheral edge 61 of the bag body 3 is brought into contact with the outer peripheral surface of the annular member 13. If the member 13 is wound around, the end of the bag body 3 is unfixed from the end of the bag body 3 due to the increase in the internal pressure of the bag body 3 or the end of the bag body 3 due to the increase in the internal pressure of the bag body 3. The parts are damaged, and there is no possibility that the grout material leaks due to them.

DESCRIPTION OF SYMBOLS 1 Ground mountain reinforcement material 2 Core material 3 Bag body 4 Internal space 6 Bag body fixing tool 11 Narrow member (1st narrow member)
12 Narrow member (second narrow member)
11a Narrow member (second narrow member)
12a Narrow member (first narrow member)
13 Ring member 14 Bolt (attraction mechanism)
20, 27 Core material insertion hole 21 Female screw hole (attraction mechanism)
26 Bolt insertion hole 29 Adhesive filling hole 61 Edge peripheral edge 73 of bag body 3 Restraint band 82 Core material covering cap 84 Grout injection pipe 85, 86 Pipe insertion hole 92 Narrow member (first narrow member)

Claims (10)

A bag body in which an inner space into which a grout material is injected is formed in the bag body by fixing an end portion of the bag body formed in a tube shape to a core material inserted and arranged in the bag body. In the fixture,
A first narrowing member having a core material insertion hole through which the core material is inserted, and a core material that is disposed closer to the bag body than the first narrowing member and through which the core material is inserted. A second narrowing member in which an insertion hole is formed, and a peripheral edge of the bag body through which the core member is inserted in a state of being disposed between the first narrowing member and the second narrowing member In the state where the core member is inserted through the core member insertion hole and the annular member through which the core member is inserted, and the first narrow member and the second narrow member on the core of the core member along and a mechanism was freely attracting attracting each other, of the first sandwiching bond member and the second sandwiching bond member, either of the sandwiching bond members together configured to enable fixed to the core member The other narrowing member can be attracted to the one narrowing member in such a manner that the pulling mechanism takes a reaction force from the one narrowing member. Configured, the first sandwiching bond member, the second sandwiching bond member and the annular member, the other end and the second narrow end and the annular member of the first sandwiching bond member and the annular member A bag fixing tool, wherein the attachment members are configured to contact each other through the peripheral edge of the end of the bag. The pulling mechanism includes a male screw extending from one of the first narrowing member and the second narrowing member, and the first narrowing member and the second screw threaded to the male screw. The bag body fixing tool according to claim 1, comprising a female screw disposed or formed on the other side of the narrowing member. A female screw in which the male screw is configured by a bolt and a bolt insertion hole through which the bolt is inserted is formed in one of the first narrowing member and the second narrowing member. The bag body fixing tool according to claim 2, wherein a hole is formed on the other side as the female screw. The bag body fixing tool according to any one of claims 1 to 3, wherein an adhesive filling hole communicating with the core material insertion hole is provided in the first narrowing member or the second narrowing member. The wedge contact surface is formed in the vicinity of the opening of the inner peripheral surface of the core material insertion hole, and a wedge member that is in contact with the wedge contact surface is provided. The bag fixing device according to the description. In a state where the annular member is sandwiched between the first narrowing member and the second narrowing member via the peripheral edge of the bag body, the first narrowing member and the second narrowing member The first narrowing member, the second narrowing member, and the annular member are configured such that a putty filling space is formed inside the peripheral edge of the end portion of the bag body. The bag fixing tool according to any one of claims 5 to 5. The restraint band comprised so that the folding | turning part in the edge part edge periphery of the said bag body could be wound around this annular member in the state contact | abutted to the outer peripheral surface of the said annular member was provided. The bag fixing tool according to any one of the above. The pipe insertion hole through which the grout injection pipe is inserted is provided in each of the first narrowing member and the second narrowing member so as to be parallel to the core member insertion hole. The bag fixing tool according to any one of the above. A ground reinforcing material in which the core material to be fixed by the bag fixing device according to any one of claims 1 to 8 is a PC steel wire. The ground reinforcing material according to claim 9, wherein an exposed end portion of the PC steel stranded wire extending from the first narrowing member is covered with a core covering cap.

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