JP5766565B2 - Reinforcing material bag restraint, and ground reinforcing method using the same - Google Patents

Description

  The present invention attaches a bag body to the outer peripheral surface of a reinforcing member made of a cylindrical steel material or a rod-shaped steel material having a male threaded portion, and pressurizes and injects the grout material into the bag body. In the reinforcement method of the ground that is inflated with the ground and improves the peripheral friction resistance with the ground, a bag restraint for reinforcing material for fixing the end of the bag body to the reinforcing material outer peripheral surface in a closed state, and using the same The present invention relates to a method for reinforcing ground.

  Conventionally, as a method for reinforcing an unstable ground such as a slope, a reinforcing method is known in which a tubular bag is combined with a reinforcing material such as a reinforcing bar or a full screw bolt. In this technique, a head portion as a fixing means for a structure such as a frame and a pressure receiving plate is formed on one end side of a reinforcing material, and a synthetic fiber thread is placed on the other end side embedded in a ground drilling hole. In a state where a flexible bag body woven in a shape is covered, it is inserted into the hole, and a grout material is injected under pressure into the bag body and cured.

  In the above technique, the cylindrical bag body is expanded in the drilling hole by the injection pressure of the grout material, so that the grout material does not leak from both ends of the bag body, and is closed against the outer peripheral surface of the reinforcing material. It is very important to fix with. Therefore, as a method for fixing the end portion of the bag body, the present applicant has already proposed a technique in which a fastening band and a water stop material such as a hydraulic putty are used in combination (Patent Documents 1 and 2). Further, a technique is known in which a fastening band and a hydraulic putty are used on the head side (mouth side) of the bag body, and the tip side is fixed with a socket and a cap (Patent Document 3).

JP 2009-191582 A Japanese Patent No. 4696556 Japanese Patent No. 3836848

  By the way, since the inner diameter of the cylindrical bag used in the reinforcing method is generally about 2 to 10 times the outer diameter of the reinforcing material, the end of the bag is narrowed to match the outer peripheral surface of the reinforcing material. A wrinkle extending in the longitudinal direction of the reinforcing material is formed at the end of the bag body due to the large circumferential length difference, and a plurality of folded portions are formed along the wrinkle. Under such circumstances, in each of the fixing methods described in Patent Documents 1 to 3, water is used so that the grout material does not leak from the gap between the reinforcing material and the bag body end portion or the folded portion of the bag body end portion. This can be done by applying a water-stopping material such as hard putty. However, in such a method, the work process is many and complicated, and in particular, since the work of applying a water-stopping material such as hydraulic putty requires skill, a fixed state in which a closed state is sufficiently secured can be stably achieved. There are still some difficult aspects to offer. Furthermore, in the mounting operation, the amount of the water-stopping material applied to the end of the bag body cannot be visually confirmed, and it must be relied on to visually check whether the reinforcing material is in close contact with the bag body. Therefore, there is room for improvement.

  The present invention has been made paying attention to such points, and can easily and reliably attach the bag to the reinforcing material, and eliminates the need for applying a water-stopping material such as hydraulic putty. It is an object of the present invention to provide a bag restraint for reinforcing material (hereinafter sometimes simply referred to as a bag restraint), and a ground reinforcing method using the same.

In order to achieve the above-mentioned object, the bag restraint for reinforcing material of the invention according to claim 1 is an end of the bag that expands by pressure injection of grout material on the outer peripheral surface of the reinforcing material on which the male screw portion is formed. This is a bag restraint for reinforcing material that fixes the portion in a closed state, and the end portion of the bag body that is folded along the outer peripheral surface of the reinforcing material is provided at one end of the hollow portion through which the reinforcing material is inserted. An inclined female screw portion having a diameter reduced toward the inside is formed by being sandwiched between the male screw portion and the inner screw portion of the reinforcing material on the other end side of the hollow portion. A threaded female thread portion that determines the attachment position with respect to the reinforcing material is formed, and a compression portion that compresses the bag body end portion is provided between the threaded female thread portion and the inclined female thread portion. It is characterized by. As a result, when the bag body restraint tool is rotated, the inclined female thread portion gradually restrains the bag body end portion to closely contact the reinforcing material outer peripheral surface and smoothly feeds it to the compressing portion. Since the bag end is compressed between the reinforcing member and the bag end, the closed state between the reinforcing member and the bag end is sufficiently ensured. The application work of the water-stopping material such as is no longer necessary, and the work process related to the mounting of the bag body can be greatly simplified.
According to a second aspect of the present invention, there is provided the bag restraint for reinforcing material in the bag restraint for reinforcing material according to the first aspect, wherein the compression portion is formed on the outer peripheral surface of the reinforcing material with the end of the bag interposed. A parallel female screw portion that is screwed into the male screw portion to compress the bag body end portion in the radial direction, and the bag end portion is folded in the longitudinal direction between the parallel female screw portion and the female screw portion for screwing. The parallel female screw part to be compressed and the concave part having a diameter larger than that of the female screw part for screwing are characterized in that it is characterized in that According to this configuration, the bag body end portion is compressed in the radial direction, that is, toward the center of the reinforcing material, and is also compressed in a folded state in the longitudinal direction of the bag body. The occlusion state is further improved, and it is possible to reliably prevent the grout material from leaking out from the site where the bag restraint is mounted.
According to a third aspect of the present invention, there is provided the reinforcing body bag restraint device according to the first aspect, wherein the compression portion is located between the inclined female screw portion and the screwing female screw portion. The parallel female screw portion for compressing the body end portion in a folded state in the longitudinal direction and a concave portion having a diameter larger than that of the female screw portion for screwing. According to this configuration, since the end of the bag body is compressed in a folded state in the longitudinal direction of the bag body in the recess, it is possible to prevent the grout material from leaking out from the mounting portion of the bag body restraining tool.
According to a fourth aspect of the present invention, there is provided the bag restraint for reinforcing material according to the second or third aspect, wherein the recess includes the parallel female screw portion and the female screw for screwing. It has step surface portions that are substantially perpendicular to the axial direction at the boundaries with the respective portions, and the bag body end portion is compressed in a folded state in the longitudinal direction of the lock bolt between the step surface portions. . According to this configuration, the front and rear ends of the recessed portion whose diameter is larger than that of the parallel female screw portion and the female screw portion for screwing have the step surface portions substantially perpendicular to the axial direction, and the bag body end portion is formed by the step surface portions of the front and rear ends. Since it is compressed in a folded state, the bag body end can be reliably compressed in a folded state in a direction substantially perpendicular to the axial direction, and the grout material can be more reliably leaked from the site where the bag restraint is mounted. Can be prevented.
Further, the bag restraint for reinforcing material according to claim 5 is the bag restraint for reinforcing material according to claim 1, wherein the compression portion is formed on the outer peripheral surface of the reinforcing material with the end of the bag interposed. It is a parallel female screw portion that is screwed into the male screw portion and compresses the bag body end portion in the radial direction. According to this configuration, the bag body end portion is compressed toward the radial direction thereof, that is, toward the center of the reinforcing material, so that it is possible to prevent the grout material from leaking out from the attachment site of the restraining tool.
Moreover, the bag restraint for reinforcing material according to the invention of claim 6 is the bag restraint for reinforcing material according to any one of claims 1 to 5, from the outer side to the inner compression portion. A through hole is provided. Thereby, it can be visually confirmed from the outside using the through hole whether or not the end portion of the bag body has reached the compression portion of the bag body restraining tool, and a more reliable mounting operation is possible.
According to a seventh aspect of the present invention, there is provided a method for reinforcing a ground using a reinforcing body bag restraint according to a seventh aspect of the present invention. While inserting a bag body, the bag body restraint tool for reinforcement materials as described in any one of Claims 1-5 is screwed together, and the edge part of a bag body is made to follow a reinforcement material outer peripheral surface. The bag body is attached after the end of the bag body is fixed in a closed state by screwing a bag body restraint for reinforcing material into the folded end part from the inlet side of the inclined female screw part. The reinforcing material is inserted into a drilling hole provided in the ground, the grout material is injected into the bag under pressure, and then the grout material is injected into the drilling hole. Thereby, in the ground reinforcement work by the reinforcing material, the bag body, and the grout material, the attaching work of the bag body to the reinforcing material becomes easy, which greatly contributes to the improvement of workability.

  According to the reinforcing body bag restraint of the present invention and the ground reinforcing method using the same, the end portion of the cylindrical bag body inserted through the predetermined position of the reinforcing material is folded along the outer peripheral surface of the reinforcing material. When the bag body restraining tool is rotated toward this end portion, the inclined female thread portion gradually intensifies the inner end portion of the bag body that is partially thickened by folding. Since it is fed into the compression part and the compression part compresses the bag end with the outer peripheral surface of the reinforcing material, a closed state is formed between the reinforcing material and the bag end easily and reliably. Mounting without leakage of the material is possible, and the mounting work can be simplified.

It is a perspective view which shows the use condition of the bag body restraint tool for reinforcement materials which concerns on this invention. It is a fragmentary sectional view of the bag body restraint tool for reinforcing materials. It is a fragmentary sectional view which shows the state which inserted the bag body in the reinforcing material. It is a fragmentary sectional view which shows the state which the inclination thread part of the bag body restraint tool for reinforcing materials restrained the edge part of a bag body. It is a fragmentary sectional view which shows the state which the parallel thread part of the bag body restraint tool for reinforcing materials is compressing the edge part of a bag body. It is a fragmentary sectional view which shows the state which the recessed part of the bag body restraint tool for reinforcing materials is compressing the edge part of a bag body. It is a figure which shows the state by which the recessed part of the bag body restraint tool for reinforcing materials was filled with the edge part of the bag body, and the edge part of the bag body was twisted. It is sectional drawing which shows the other example of the bag body restraint tool for reinforcing materials which concerns on this invention. It is sectional drawing which shows the further another example of the bag body restraint tool for reinforcing materials which concerns on this invention.

  Next, an example of a reinforcing body bag restraint according to the present invention and a ground reinforcing method using the same will be described with reference to the drawings. In the present invention, the “reinforcing material” means a cylindrical steel material such as a lock bolt made of a hollow steel bar or a circular steel pipe, or a bar-like steel material having no hollow part, and at least a part of the bag in the longitudinal direction. A male thread part to which the body restraining tool can be screwed is formed.

≪Configuration of bag restraint for reinforcing material≫
FIG. 1 is a perspective view showing a use state of a reinforcing body bag restraint 1 according to the present invention, and FIG. 2 is an enlarged view of the reinforcing body bag restraint 1, which is a lower portion from the center line in the longitudinal direction. Is shown in cross section. The hatched portion in the figure indicates the thickness of the cross section of the bag restraint 1. As shown in FIG. 1, the bag restraint tool 1 includes a cylindrical bag body 3 that is expanded by pressure injection of a grout material and inserts both ends into the outer peripheral surface of the reinforcing material 2. It is a member for fixing in a closed state. As the raw material, a hard material such as metal, ceramics, or hard resin is used, and as shown in FIG. 2, it is formed in a cylindrical shape having a hollow portion 11 through which the reinforcing material 2 is inserted. The reinforcing material 2 applied to the present invention is made of a cylindrical steel material, and a male screw having a rope-shaped screw shape defined as a screw portion of a rock drill joint rod (see JIS M3914) is provided on the outer peripheral surface thereof. A screw portion 21 is formed. The bag body 3 is made by weaving fiber yarns such as aramid fiber, polypropylene fiber, and polyester fiber in a cylindrical shape. For example, a bag having a diameter of about 2 to 10 times the outer diameter of the reinforcing material 2 is used. What is necessary is just to select length suitably according to use conditions. In the present invention, as means for eliminating the large diameter difference existing between the reinforcing material 2 and the bag body 3, the end of the large diameter bag body 3 is folded along the outer peripheral surface of the small diameter reinforcing material 2, By fixing the folded end portion with the bag restraint 1, there is a great feature in that a highly reliable closed state is realized at the end portion of the bag body 3.

  Therefore, inside the hollow portion 11 of the bag restraint 1, as shown in FIG. 2, the inclined female screw portion 11 a, the parallel female screw portion 11 b, respectively, from the left side in the drawing to the right side in the drawing, A recess 11c and a threaded female thread portion 11d are formed. In addition, in the bag body restraint tool 1 of this embodiment, the parallel female screw part 11b and the recessed part 11c are equivalent to the compression part of this invention.

  The inclined female screw portion 11a located on the inlet side of the bag body 3 captures the end portion of the bag body 3 folded so as to match the outer peripheral surface of the reinforcing member 2, and the parallel female screw portion 11b located on the inner side thereof In order to be guided, it gradually narrows toward the inside (the direction in which the bag 3 enters), and is formed into a taper screw shape having the same screw pitch as the male screw portion 21 of the reinforcing member 2. In this case, the inclined female screw portion 11 a has a guiding function of storing the end portion of the bag body 3 that is folded and increased in thickness while smoothly guiding the end portion of the bag body 3 into the bag body restraining tool 1. In addition, although not shown in figure, the predetermined chamfering is given to the end surface 14 of the bag body restraint tool 1 used as the entrance side of the inclination internal thread part 11a. This is to prevent the peripheral portion of the end face 14 from becoming an edge and damaging the bag 3 when the bag 3 is inflated by the pressure injection of the grout material.

  Next, the parallel female screw portion 11b is continuous with the small diameter side of the inclined female screw portion 11a, and the crests and crests or troughs and troughs of the female screw are connected in parallel to the longitudinal direction of the hollow portion 11, and It is formed with the same screw pitch as the male screw portion 21. That is, the parallel female screw portion 11b is sandwiched between the end portion of the bag body 3 that has been folded and increased in thickness with the male screw portion 21 of the reinforcing member 2 having the same screw pitch. Since the end portion of the material follows the thread shape of both due to the flexibility and elasticity of the material, it is as if the sealing material (the end portion of the bag body 3) is interposed in the male screw portion 21 of the reinforcing material 2 It becomes. Thereby, the parallel female screw part 11b exhibits the function which compresses the edge part of the bag body 3 to radial direction (center direction of the hollow part 11) between the male screw parts 21 of the reinforcement material 2, and closely_contact | adheres. Therefore, the clearance formed between the parallel female screw portion 11b and the male screw portion 11 of the reinforcing member 2 is folded and increased in thickness in the cross section orthogonal to the axial direction of the reinforcing member 2. It is desirable that the thickness is substantially the same as or slightly larger than the thickness of the end portion of each of the layers. That is, the cross-sectional area of the clearance in the cross-section orthogonal to the axial direction of the reinforcing member 2 is almost equal to the cross-sectional area of the end portion (wall thickness) of the bag body 3 or is small enough not to impair the adhesion and insertion property. It is desirable to be large. More specifically, the clearance cross-sectional area is determined by taking into account the flaw of the end of the bag body 3, uneven folding, deformation and bending at the time of insertion, etc. About 0 to 1.5 times. However, this range is merely an example because it depends on the material of the bag 3. By setting in this way, when the bag body restraint tool 1 is rotated and inserted while the end portion of the bag body 3 is narrowed and folded, the end portion of the bag body 3 is in an equally close state within the clearance. It is stored and compressed in the radial direction between the male screw portion 21.

  The recess 11c is provided between the parallel female screw portion 11b and the female screw portion 11d for screwing, and has a larger diameter than the parallel female screw portion 11b and the female screw portion 11d for screwing, and the inclined female screw portion 11a and the parallel female screw portion 11d. Unlike the female screw part 11b, it has a shape in which the female screw part is not formed on the inner peripheral surface. The concave portion 11c is compressed in a state where the end portion of the bag body 3 whose end portion is separated by cutting or folded in a frayed state and whose thickness is increased is folded in the longitudinal direction as shown in FIG. By doing so, it has a function of preventing the outflow of the grout material together with the radial pinching (compression) effect in the parallel female screw portion 11b. In this case, the concave portion 11c is a pocket-shaped space having a diameter larger than the diameter of the parallel female screw portion 11b and the screwing female screw portion 11d and extending outward in the radial direction, and therefore the boundary with the parallel female screw portion 11b. In the space between the stepped surface portion 11c1 formed at the step and the stepped surface portion 11c2 formed at the boundary between the threaded female threaded portion 11d, the end of the bag body 3 is placed in the longitudinal direction (even in the longitudinal direction of the reinforcing material 2). 1) or the like, the end of the bag body 3 is further brought into close contact with the outer peripheral surface of the reinforcing member 2 by further compressing one or more times. It should be noted that a female screw portion may be formed on the inner peripheral surface of the recess 11 c as long as the end portion of the bag 3 is not adversely affected by folding the end portion of the bag member 3 in the longitudinal direction of the reinforcing member 2.

  The threaded female thread portion 11d is formed on the inner peripheral surface of the hollow portion 11 on the side opposite to the inclined female thread portion 11a, has a smaller diameter than the parallel female thread portion 11b and the concave portion 11c, and is formed on the male thread portion 21 of the reinforcing member 2. The bag body restraint tool 1 is moved to an arbitrary position of the reinforcing member 2 and fixed at a predetermined position. It is desirable that the inclined female screw portion 11a, the parallel female screw portion 11b, and the screwing female screw portion 11d have the same screw pitch. If the screw pitches are different, when the bag restraint 1 is attached to the end of the bag 3 and rotated, wrinkles are gradually generated at the end of the bag 3 due to the pitch deviation. This is because it becomes difficult to insert and feed the end of the body 3.

  On the other hand, a plurality of grooves 12 for hooking a pile wrench are formed on the outer peripheral surface of the bag restraint 1 at a predetermined interval in the circumferential direction, and 1 that penetrates the cylinder wall from the outside to the recess 11c of the hollow portion 11 Alternatively, a plurality of through holes 13 are formed. Whether or not the end of the bag body 3 reaches the position of the recess 11c by looking into the through hole 13 from the outside, and further, the end of the bag body 3 is folded in the longitudinal direction. Such a state can be easily confirmed, which is useful for reliable construction, but is not an essential requirement.

<Reinforcement method of ground using bag restraint 1 for reinforcing material>
Next, a ground reinforcing method using the reinforcing material bag restraint 1 having the above-described structure will be described with reference to FIGS. 4 to 6, for convenience, reference numerals of the inclined female screw portion 11 a, the parallel female screw portion 11 b, the concave portion 11 c, and the screwing female screw portion 11 d are attached to the outside of the reinforcing member 2.

  First, as shown in FIG. 3, the cylindrical bag body 3 is inserted into a predetermined position (tip portion) of the reinforcing member 2 that is hollow and has the male screw portion 21 formed on the outer peripheral surface. Next, in order to restrain both ends of the bag body 3, the two bag body restraining tools 1 are screwed and attached to the reinforcing member 2 via the threaded female thread portions 11d. Next, the end of the bag body 3 is folded several times while being narrowed as evenly as possible so as to be in close contact with the outer peripheral surface of the reinforcing member 2, and the end of the bag body 3 is increased in thickness by being folded. Then, the bag body restraint tool 1 is covered while being rotated from the inclined female screw portion 11a side. In that case, since the groove part 12 is formed in the outer peripheral surface of the bag body restraint tool 1 by the predetermined space | interval, when a hand rotation becomes difficult, a pile wrench (not shown) is hooked and turned. Since the inclined female screw portion 11a has a large diameter on the inlet side and is narrowed so that the diameter becomes smaller toward the outlet side (inward), a uniform cut surface can be obtained by rotating the bag restraint 1. The end portion of the bag 3 whose thickness is increased by folding is sandwiched between the male screw portion 21 on the outer peripheral surface of the reinforcing member 2 while being gradually restrained as shown in FIG. It feeds into the female screw part 11b.

  FIG. 5 is a partial cross-sectional view showing a state in which the end portion of the bag body 3 is compressed by the parallel female screw portion 11 b and the male screw portion 21 of the reinforcing member 2. As shown in FIG. 5, the parallel female screw portion 11 b is screwed into the male screw portion 21 of the reinforcing member 2 with the end portion of the bag body 3 that is folded and increased in thickness interposed therebetween, so that the male screw By compressing the end portion of the bag body 3 in the radial direction, that is, in the center direction of the reinforcing member 2, the male threaded portion 21 on the inner peripheral surface of the bag body restraining tool 1 and the outer peripheral surface of the reinforcing member 2. It is possible to make it tightly adhere to and seal in this section.

  When the bag restraint 1 is further rotated from the above state, as shown in FIG. 6, the end of the bag body 3 is fed into the recess 11c from the parallel female screw portion 11b, and the boundary with the screwing female screw portion 11d. The tip of the end abuts on the step surface portion 11c1. Here, since the concave portion 11c is a pocket-shaped space portion having a diameter larger than that of the parallel female screw portion 11b, when the bag body restraint tool 1 is further rotated, the end portions of the bag body 3 are successively turned into parallel female screws. As shown in FIG. 6, the reinforcing material 2 is fed between the step surface portion 11c2 at the boundary with the threaded female screw portion 11d and the step surface portion 11c1 at the boundary with the parallel female screw portion 11b as shown in FIG. Compressed in the longitudinal direction, folded several times and stuck together. That is, in the section of the parallel female screw portion 11b, when the end portion of the bag body 3 is screwed with the male screw portion 21 of the reinforcing member 2 with the end portion of the bag body 3 interposed (pinched), the end portion of the bag body 3 is arranged in the radial direction. In the section of the recess 11c, the end portion of the bag body 3 is compressed in the longitudinal direction of the reinforcing material 2 in the space between the step surface portion 11c1 and the step surface portion 11c2, and folded. It seals by making it into a state.

  Therefore, in this bag body restraint tool 1, the end portion of the bag body 3 in which the inclined female screw portions 11 a are bundled unevenly is gradually restrained, and is sandwiched between the male screw portion 21 on the outer peripheral surface of the reinforcing member 2, Since the feeding is sequentially performed, the mounting work of the bag body 3 can be simplified. In addition, since the end portion of the bag body 3 is compressed in two different directions (radial direction and longitudinal direction) at two locations of the parallel female screw portion 11b and the concave portion 11c, the sealing function is dramatically improved by their synergistic effect. It improves, the application | coating operation | work of the water stop material in the edge part of the bag body 3 becomes unnecessary, and can simplify a work process significantly. In particular, by simply rotating the bag restraint 1, the end of the bag 3 can be reliably restrained and fixed to the reinforcing member 2 in a highly reliable closed state. Greatly improved. In addition, a water-stopping material such as hydraulic putty, a tightening ring, a cap / socket, and the like are not required, and the bag restraint 1 having a simple configuration can prevent leakage of the grout material, leading to a reduction in construction cost.

  In the process of rotating and tightening the bag restraint 1, if the recess 11 c is filled with the end of the bag 3 and can no longer be compressed, the frictional resistance between the bag restraint 1 and the bag 3 will be described. Increases and the bag body 3 begins to twist as shown in FIG. If it will be in such a state, the bag body restraint tool 1 will be reversely rotated and the twist will be returned. Since the through hole 13 is formed in the outer peripheral surface of the bag restraint 1, the bag can reach the recess 11 c even when twisting occurs or by looking through the through hole 13 from the outside before. It can be confirmed whether the end portion of the body 3 has reached, and whether or not a folded portion is formed at the end portion, and reliable construction is possible. The other end portion of the bag body 3 is similarly fixed by the bag body restraint tool 1. In addition, the bag body restraint tool 1 is not necessarily used on both end sides of the bag body 3, but may be applied only to the mouth side where the pressure is higher than that of the front end side, and the front end side may be used as another fixing means.

  Thereafter, the reinforcing material 2 to which the bag body 3 is attached is inserted into a drilled hole formed in the ground, and a grout material is pressurized and injected into the bag body 3 through the hollow portion of the reinforcing material 2. The grout material flows out into the bag body 3 from a through hole (not shown) provided in the outer peripheral surface of the reinforcing member 2 or the outer peripheral surface of a coupler (not shown). Then, after the grout material in the bag body 3 is cured, the grout material is further injected into the drilling hole above the bag body 3, and after the grout material in the drilling hole is cured, the head of the reinforcing material 2 is grounded. Let it settle on the surface.

  In addition, in the bag body restraint tool 1 which concerns on the said embodiment, although the example provided with both the parallel internal thread part 11b and the recessed part 11c was demonstrated as a compression part, in this invention, it is not limited to this. That is, like the bag restraint tool 1 ′ shown in FIG. 8, the parallel female screw portion 11b is omitted, and only the recess 11c is provided, or the recess 11c is made like the bag restraint tool 1 ″ shown in FIG. It may be omitted, and only the parallel female screw portion 11b may be provided, and the shape of the concave portion 11c may be as long as the diameter is larger than that of the parallel female screw portion 11b and the screwing female screw portion 11d. For example, it is not essential to provide the stepped surface portions 11c1 and 11c2.For example, the stepped surface portions 11c1 and 11c2 may be omitted by forming a recess having an arc-shaped cross section between the parallel female screw portion 11b and the female screw portion 11d for screwing. In addition, an example in which the reinforcing material 2 is applied to a cylindrical steel material has been described, but for example, the bag restraint 1 and the bag body 3 are attached to a rod-shaped steel material having no hollow portion such as a threaded joint, and the end of the injection hose is attached. By appropriate means Inside is opened in the body 3, the grout through the injection hose may be filled into the bag body 3.

  DESCRIPTION OF SYMBOLS 1,1 ', 1' '... Bag body restraint tool 1 for reinforcing materials, 11 ... Hollow part, 11a ... Inclined female screw part, 11b ... Parallel female screw part (compression part), 11c ... Recessed part (compression part), 11c1, 11c2 ... Step surface portion, 11d ... Female thread portion for screwing, 12 ... Groove portion, 13 ... Through hole, 2 ... Reinforcing material, 21 ... Male screw portion, 3 ... Bag body.

Claims (7)

  A reinforcing body bag restraint for fixing an end portion of a bag body, which is expanded by pressure injection of a grout material, in a closed state on the outer peripheral surface of the reinforcing material on which a male thread portion is formed. At one end of the hollow part, the end of the bag body folded along the outer peripheral surface of the reinforcing material is inserted between the male threaded portion of the outer peripheral surface of the reinforcing material, and the inside diameter is reduced. An inclined female thread portion is formed, and on the other end side of the hollow portion, a threaded female thread portion is formed which is screwed into the male thread portion on the outer peripheral surface of the reinforcing material to determine the mounting position with respect to the reinforcing material. A bag restraint for reinforcing material, characterized in that a compression portion for compressing the end portion of the bag body is provided between the joint female screw portion and the inclined female screw portion.   2. The bag restraint device for a reinforcing material according to claim 1, wherein the compression portion is screwed into a male screw portion on the outer peripheral surface of the reinforcing material in a state where the bag body end portion is interposed to compress the bag body end portion in the radial direction. The parallel female screw portion, and the parallel female screw portion and the female screw portion for screwing, which are between the parallel female screw portion and the female screw portion for screwing and compress the bag body end portion in a folded state in the longitudinal direction. A bag restraint for reinforcing material, characterized by being a recessed portion.   2. The bag restraint for reinforcing material according to claim 1, wherein the compression portion is between the inclined female screw portion and the female screw portion for screwing, and the parallel female screw compresses the end portion of the bag body in a folded state in the longitudinal direction. A bag restraint for reinforcing material, characterized in that it is a recessed portion having a diameter larger than that of the female screw portion and the female screw portion. 4. The reinforcing body bag restraint device according to claim 2, wherein the recess has a step surface portion substantially perpendicular to the axial direction at a boundary between the parallel female screw portion and the screwing female screw portion. A bag restraint for reinforcing material, wherein the bag body end portion is compressed in a folded state in the longitudinal direction of the lock bolt between the stepped surface portions.   2. The bag restraint device for a reinforcing material according to claim 1, wherein the compression portion is screwed into a male screw portion on the outer peripheral surface of the reinforcing material in a state where the bag body end portion is interposed to compress the bag body end portion in the radial direction. A bag restraint for reinforcing material, which is a parallel female screw portion.   The reinforcing body bag restraint device according to any one of claims 1 to 5, further comprising a through-hole penetrating from an outer side to an inner compression portion. Ingredients.   While inserting the cylindrical bag body expanded by pressurization injection of a grout material to the outer peripheral surface of the reinforcing material in which the external thread part was formed, The claim 1 according to any one of claims 1 to 5. Screw the reinforcing body bag restraint, fold the end of the bag so as to be along the outer peripheral surface of the reinforcing material, and fold the reinforcing body bag restraint into the inclined female screw portion at the folded end. After screwing in from the entrance side of the bag and fixing the end of the bag body in a closed state, a reinforcing material attached to the bag body is inserted into a drilling hole provided in the ground, and the grout material is injected into the bag under pressure. Then, a ground reinforcement method using a bag restraint for reinforcing material, characterized in that grout material is injected into the drilling hole.

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