JP6745573B2 - Lock bolt holding jig and spraying method using the same - Google Patents

Description

The present invention relates to a spraying method combined with a ground reinforcement earthwork, and a reinforcing member holding jig used for holding a reinforcing member (rebar) in the spraying method.

Perform earth-reinforcing earthwork by using rock reinforcements (such as rock bolts) and pressure plates on the spray layer (existing spray layer) formed by spraying mortar/concrete on the cut surface or the surface of natural slope. There is a case to do. In such a case, for example, the applicant has already proposed a technique for forming a pressure receiving plate of the ground reinforcement by spraying a spray material onto the existing spray layer.
Here, when the pressure receiving plate is formed by spraying mortar/concrete, a reinforcing material such as a reinforcing bar is built in (accommodated) in the pressure receiving plate in order to secure the strength required for the pressure receiving plate. In that case, the reinforcement and the ground reinforcement must be arranged orthogonally.

Here, since the cut surface and the surface of natural inclination have unevenness and unevenness, corresponding unevenness and unevenness occur on the surface of the existing spray layer. On the surface of the existing spray layer where there are such irregularities and unevenness, a large number of fixed anchors are placed in order to arrange the reinforcing material (for example, reinforcing bars) at right angles to the natural reinforcing material (for example, rock bolts). However, it is necessary to adjust the installation angle and the extending direction of the reinforcing material (for example, reinforcing bar).
However, when a large number of fixed anchors are placed, workability is reduced. Further, when the surface of the existing spray layer has a large unevenness or unevenness, it is difficult to increase the accuracy of the work for placing a large number of fixed anchors.

As another conventional technique, there is one that discloses that a rock bolt and sprayed concrete are main supporting members in tunnel excavation (for example, Patent Document 1), but the above-mentioned problems of the conventional technique cannot be solved. Absent.

JP 2002-128555 A

The present invention has been proposed in view of the above-mentioned problems of the conventional technology, workability is good even in the spraying method combined with natural ground reinforced earthwork, and unevenness or unevenness on the surface of the existing spraying layer It is an object of the present invention to provide a reinforcing member holding jig capable of maintaining high working accuracy even on existing slopes or existing spraying layers, and a spraying method using the same.

The lock bolt holding jig (10, 20: natural ground reinforcement connecting coupler) of the present invention is
A body portion (10A, 20A) configured so that the lock bolt (1) can penetrate therethrough;
Provided on the extending portions (10B, 20B) extending radially outward from the main body portion (10A, 20A) and the extending portions (10B, 20B) (for example, in the vicinity of the radially outer end portion). And a reinforcing member fixing tool (40C) configured to be able to hold the reinforcing member (2: deformed bar, for example),
A female screw (FS) is formed on the main body (10A, 20A), and the female screw (FS) is screwed onto a male screw (MS) formed over the entire length of the lock bolt (1) in the longitudinal direction. Regarding the axial position of the lock bolt (1), the lock bolt (1) is fixed to a position on the ground side from the ground-side tip portion of
The reinforcing member fixing tool (40C) is composed of a metal plate (for example, a steel plate), is formed in a substantially semi-cylindrical shape with a partial region open, and is reinforced with a main body portion (40CA) surrounding the reinforcing member (2). A reinforcement member insertion portion (40CB) that constitutes an opening that is an insertion opening of the member (2) and a part of the reinforcement member insertion portion (40CB) are cut out and protruded obliquely downward toward the main body portion (40CA). The protrusion area (40CC) is provided, and the opening area of the reinforcing member insertion section (40CB) decreases toward the main body section (40CA).
The main body portion (10, 20) is screwed into a male screw (MS) formed in the entire region of the lock bolt (1) in the longitudinal direction so that the main body portion (10, 20) is located at a position closer to the ground than the tip of the lock bolt (1) on the ground side. It is characterized by having a fixing nut screwed adjacent (4).

In the spraying method of the present invention using such a lock bolt holding jig (10, 20),
The male screw (MS) formed on the entire region of the lock bolt (1) in the longitudinal direction is attached to the female screw (of the main body portion (10A, 20A) of the lock bolt holding jig (10, 20: natural reinforcing material connecting coupler)). FS) is screwed, the lock bolt (1) penetrates the main body part (10A, 20A), and the main body part (10A, 20A) is grounded in the axial direction of the lock bolt (1) rather than the tip on the ground side. Fixed in the side position,
Prior to screwing the female screw (FS) of the body portion (10A, 20A) of the lock bolt holding jig (10, 20) with the male screw (MS) of the lock bolt (1), a fixing nut ( 4) is screwed onto the male screw (MS) of the lock bolt (1), and the female screw (FS) of the main body portion (20A) of the lock bolt holding jig (20) is moved over the entire length of the lock bolt (1). screwed with the male thread (MS) formed in and upon securing the position of the ground side from the ground side tip of the lock bolt (1), the locking bolt holding the axial position of the lock bolt (1) use jig (20) adjacent and fixed to the locking nut (4),
From the insertion portion (40CB) of the reinforcing member fixing tool (40C) provided on the outer side in the radial direction of the lock bolt holding jig (10) (for example, in the vicinity of the outer end in the radial direction of the extending portion 10B). The reinforcing member (2) is inserted against the elastic repulsive force of the fixture (40C) (constituting the metal plate), the protrusion (40CC) is passed through, and the main body (40CA) is accommodated and held.
The pressure receiving plate (3) is formed by spraying a spray material (for example, mortar or concrete).

According to the present invention having the above-mentioned configuration, the female screw (FS) of the main body portion (10A, 20A) of the jig for holding the reinforcing member (10, 20: natural ground reinforcement connecting coupler) and the natural ground reinforcement ( 1: Reinforcing member holding jigs (10, 20) are attached to the ground reinforcement member (1) by screwing a male screw (MS) of, for example, a lock bolt, and reinforcement is located radially outward. By holding the reinforcing member (2: deformed rebar, for example) in the member fixing tool (10C, 20C), the reinforcing member (2) is held at a relative position orthogonal to the natural ground reinforcing member (1). Can be done.
Therefore, the ground reinforcement material (1) and the reinforcement member (2) may be orthogonal to each other even if a large number of fixed anchors are not driven to adjust the installation angle and the extending direction of the reinforcement material (for example, reinforcing bars). In addition, it is possible to maintain the relative positional relationship between the two.

Further, a reinforcing member holding jig (10, 20: natural ground reinforcing material connecting coupler) is inserted into the natural reinforcing material (1), and a reinforcing member fixing tool (10C) in the reinforcing member holding jig (10, 20). , 20C) the reinforcing member (2) can be inserted and the reinforcing member (2) can be arranged at a right angle to the natural reinforcing material (1), so it is possible to place a large number of fixed anchors. Then, the work on the existing spray layer (100, 200) laminated on the inclined surface or the cut surface becomes easy, and the workability is improved.
Then, the male screw (MS) of the ground reinforcement material (1) and the female screw (FS) of the jig (10, 20: ground reinforcement material connection coupler) for holding the reinforcement member are screwed together to hold the reinforcement member. In a state in which the reinforcing member (2) is inserted into the reinforcing member fixing tool (10C, 20C) of the jig (10, 20) and the reinforcing member (2) is arranged at right angles to the natural ground reinforcing material (1). By spraying a spraying material such as concrete or mortar, the pressure receiving plate (3) of the ground reinforcement material (1: rock bolt, for example) is easily formed by the spraying material containing the reinforcing member (2).

Further, when the unevenness or unevenness on the inclined surface or the existing spraying layer is large and the unevenness or unevenness on the surface of the existing spraying layer (200) is large, in the present invention, the reinforcing member holding jig (20) is , Used together with a fixing nut (4) screwed so that the axial positions of the ground reinforcement (1: rock bolt, for example) are adjacent to each other, and reinforced with the male screw (MS) of the ground reinforcement (1). When screwing the female screw (FS) of the body portion (20A) of the member holding jig (20: natural ground reinforcement connecting coupler), the fixing nut (4) is screwed onto the natural ground reinforcement (1). Then, the female screw (FS) of the main body portion (20A) of the reinforcing member holding jig (20) is grounded so that the reinforcing member holding jig (20) is arranged adjacent to the fixing nut (4). The so-called "double nut" is constituted by the fixing nut (4) and the female screw (FS) of the main body (20A) of the reinforcing member holding jig (20) by being screwed into the mountain reinforcing material (1). The axial position of the ground reinforcement material (1: rock bolt, for example) of the reinforcing member holding jig (20) with respect to the ground reinforcement material (1) is fixed and does not fluctuate.
Then, by holding the reinforcing member (2: deformed rebar, for example) by the reinforcing member holding jig (20) and the fixing nut (4), the position of the reinforcing member (2) in the axial direction of the natural reinforcing material becomes constant. Since it is fixed and held, the distance from the surface of the existing spray material layer (200) to the reinforcing member (2) (ground reinforcement material, even if there are large irregularities or unevenness on the surface of the existing spray layer (200) The distance in the axial direction) is maintained above a certain level.
By spraying a spraying material such as concrete or mortar in that state, the position of the reinforcing member (2) in the pressure receiving plate (3) becomes uniform, and as a pressure receiving plate (3) of the ground reinforcing material (1: rock bolt, for example). The pressure receiving plate (3) having the required strength is easily formed.

It is a front sectional view showing a 1st embodiment of the present invention. FIG. 2 is a front cross-sectional view of the reinforcing member holding jig in FIG. 1. It is a perspective view which shows the reinforcement member fixing tool in FIG. It is a top view of the jig for holding a reinforcing member in FIG. FIG. 5 is a front cross-sectional view showing a state where the reinforcing member holding jig of FIGS. 2 and 4 holds the deformed bar. FIG. 6 is a plan view showing a state in which deformed reinforcing bars are held and arranged by a reinforcing member holding jig. It is a front sectional view showing a 2nd embodiment of the present invention. FIG. 8 is a front sectional view of the reinforcing member holding jig in FIG. 7. It is sectional drawing of a reinforcement member fixing tool.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In the illustrated embodiment, a rock bolt is shown as the ground reinforcement member 1 on which the male screw MS is formed, and a deformed bar is shown as the reinforcement member 2, but the present invention is not limited to this.

First, a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, a boring hole BH for inserting a rock bolt is cut in the existing spray layer 100, and the boring hole BH is filled with a solidifying material C (mortar, concrete, cement, etc.), and the rock bolt 1 (ground rock). Reinforcing material) is inserted. The lock bolt 1 is formed with a male screw MS that is screwed into a female screw (not shown) of a reinforcing member holding jig 10 described later.
A reinforcing member holding jig 10 (lock bolt connecting coupler) is arranged near the ground-side end (upper end) of the lock bolt 1. The female screw FS (FIG. 2) formed on the main body portion 10A of the reinforcing member holding jig 10 is screwed onto the male screw MS of the lock bolt 1, so that the reinforcing member holding jig 10 is grounded above the lock bolt 1. It is fixed near the side edge (upper edge).

Details of the reinforcing member holding jig 10 (lock bolt connecting coupler) are shown in FIG.
In FIG. 2, the reinforcing member holding jig 10 has a main body portion 10A configured as a hollow cylindrical member, and an internal thread FS is formed on the inner wall surface thereof, and the internal thread FS is the male thread of the lock bolt 1. Screw to the screw MS. The reinforcing member holding jig 10 is provided on the extending portions 10B (10B1 to 10B4) extending outward from the main body 10A in the radial direction, and on the upper surface of the extending portion 10B in the vicinity of the outer end in the radial direction. It also has a reinforcing member fixing tool 10C.
The main body 10A of the reinforcing member holding jig 10 is made of a hollow cylindrical metal material (for example, steel), and has an internal thread FS formed on the inner wall surface. However, although not shown, the main body 10A may be formed of a hollow cylindrical body having a polygonal cross section.

In FIGS. 1 to 6, four extending portions 10B (10B1 to 10B4) are arranged at equal intervals in the circumferential direction (so that the central angles are equal to 90 degrees) (see FIG. 4). The radially inner end of the existing portion 10B is fixed to the side surface of the main body 10A by a known method such as welding.
The extending portion 10B is made of, for example, a steel material having an inverted L-shaped cross section, and as shown in FIG. 2, the height dimension of the extending portion 10B is reduced outward in the radial direction.

In the extending portion 10B, the height from the lower surface of the main body portion 10A in the lock bolt axial direction (vertical direction in FIG. 2) in the pair of extending portions 10B1 and 10B2 that are symmetrical (opposing) to the main body portion 10A. H12 is set to be smaller than the height dimension H34 of the other pair of extending portions 10B3, 10B4 (the extending portion 10B4 is not shown in FIG. 2) in the lock bolt axial direction (vertical direction in FIG. 2). ..
The difference between the height dimension H34 and the height dimension H12 is set to be larger than at least the diameter dimension of the deformed reinforcing bar 2 (reinforcing member). As a result, when the deformed reinforcing bars 2 are arranged, the deformed reinforcing bars 2 held by the extending portions 10B1 and 10B2 and the deformed reinforcing bars 2 held by the extending portions 10B3, 10B4 do not interfere with each other and extend in a staggered manner. It is present.
The four extending portions 10B1 to 10B4 have the same configuration except for the relative position with respect to the main body portion 10A and the extending direction.

As shown in FIG. 3, the reinforcing member fixing tool 10C provided on the upper surface near the radially outer end of the extending portion 10B has a polygonal cross-section hollow tube with a partial area (upper side in FIG. 3) open. It is a member formed by molding a metal plate (for example, a steel plate). Then, the deformed bar 2 is inserted from the opened region.
A state in which the reinforcing member holding jig 10 is viewed from above is shown in FIG. In FIG. 4, extending portions 10B1 to 10B4 extend outward in the radial direction from the main body portion 10A at equal intervals in the circumferential direction (so that the central angles are equal to 90 degrees) and the outward direction in the radial direction. A reinforcing member fixture 10C is fixed to the upper surface near the end.
The reinforcing member fixing tool 10C has its axial direction (axial direction of the deformed reinforcing bar 2 to be held, routing direction) perpendicular to the extending direction (radial direction) of the extending portions 10B1 to 10B4 to be fixed. Similarly, it is fixed to each of the extending portions 10B1 to 10B4.

FIG. 5 shows a state in which the deformed reinforcing bar 2 (reinforcing member) is held by the reinforcing member holding jig 10 shown in FIGS. 2 and 4. As described above, the reinforcing member holding jig 10 is fixed near the upper end of the lock bolt 1 (not shown).
In FIG. 5, the deformed rebars 21 and 22 are held by the reinforcing member fixture 10C near the radially outer end of the extending portion 10B (10B1 to 10B4) of the reinforcing member holding jig 10. Then, in the direction perpendicular to the paper surface in FIG. 5, the deformed reinforcing bars 21 held by the reinforcing member fixing tools 10C of the extending portions 10B1 and 10B2 are held (routed). Further, the reinforcing member fixing tool 10C of the extending portions 10B3, 10B4 (10B4 is not shown in FIG. 5) holds the deformed reinforcing bar 22 which extends in the left-right direction in FIG.

The deformed bar 21 and the deformed bar 22 vertically intersect each other in the space where the jig 10 for holding the reinforcing member is provided or in the space above the construction region of the lock bolt 1 (FIG. 1).
Here, the plane in which the deformed bar 21 extends and the plane in which the deformed bar 22 extends (generally the same plane) are in the axial direction of the lock bolt 1 (FIG. 1) (the jig 10 for holding the reinforcing member). Of the main body portion 10A). In other words, as is clear from FIGS. 5 and 1, the deformed reinforcing bars 2 (21, 22: reinforcing members) and the lock bolts 1 (ground reinforcement members) are held at orthogonal relative positions.

FIG. 6 shows a state in which the deformed bar 2 (reinforcing member) is held by the reinforcing member holding jig 10 and the deformed bar 2 is arranged around the lock bolt 1 (FIG. 1). In the state shown in FIG. 6, by spraying a spraying material (for example, mortar/concrete) on the construction area of the lock bolt 1, the pressure receiving plate of the lock bolt 1 (reinforcing material) having the deformed bar 2 (reinforcing member) built therein. 3 (see FIG. 1) can be formed.
In FIG. 1, reference numeral 5 indicates a fixing plate for pressing and fixing the pressure receiving plate 3 to the ground side, and reference numeral 6 indicates a fixing nut.
Further, also in the area adjacent to the construction area of the lock bolt shown in FIG. 6, it is possible to form the pressure receiving plate 3 in which the deformed rebar 2 (reinforcing member) is incorporated in the manner described with reference to FIGS. I can. In FIG. 6, the deformed bar 2 shown by a dotted line is the deformed bar 2 held by a reinforcing member holding jig 10 different from the reinforcing member holding jig 10 shown in FIG.

In the construction of the first embodiment, first, the lock bolt 1 is inserted into the boring hole BH that is cut in the existing spray layer 100 and filled with the solidifying material C, and the male screw MS of the lock bolt 1 is fixed to the reinforcing member holding jig. The reinforcing member holding jig 10 is fixed to the lock bolt 1 by screwing the female screw FS of the main body portion 10A of the tool 10.
Next, the deformed bar 2 (21, 22) is inserted and held in the reinforcing member fixing tool 10C provided in the vicinity of the radially outer end of the extending portion 10B of the reinforcing member holding jig 10. In this state, the deformed bars 2 (the deformed bars 21 and 22) are held at relative positions such that they are perpendicular to each other in the space where the reinforcing member holding jig 10 is provided and are orthogonal to the lock bolt 1. To be done.
Then, in a state where the deformed rebar 2 is held orthogonally to the lock bolt 1, a spray material (for example, mortar/concrete) is sprayed and the pressure plate of the lock bolt 1 (ground reinforcement material) having the reinforcing member 2 built therein. 3 is formed.

According to the first embodiment of FIGS. 1 to 6, the female screw FS of the main body portion 10A of the reinforcing member holding jig 10 and the male screw MS of the lock bolt 1 are screwed together to form the reinforcing member holding jig 10. Holding the deformed reinforcing bar 2 at a relative position orthogonal to the lock bolt 1 by attaching the deformed reinforcing bar 2 to the lock bolt 1 and holding the reinforcing member fixing tool 10C positioned radially outward. Can be done. Therefore, it is not necessary to drive a large number of fixed anchors to adjust the installation angle and the extending direction of the reinforcing material (for example, reinforcing bars).
Here, the deformed reinforcing bars 2 are provided on the reinforcing member fixing tool 10C installed on the extending portions 10B arranged at equal intervals in the circumferential direction from the reinforcing member holding jig 10 (so that the central angles are equal to 90 degrees). Since the deformed rebars 2 (deformed bars 21 and 22) extending in two orthogonal directions intersect vertically on the construction area of the lock bolt, the height dimensions H12 and H34 shown in FIG. Since there is a difference of not less than the diameter of the deformed rebar 2, the deformed rebars 21 and 22 do not interfere with each other.

Further, if the reinforcing member holding jig 10 is inserted into the lock bolt 1 and the deformed reinforcing bar 2 (reinforcing member) is inserted into the reinforcing member fixing tool 10C of the reinforcing member holding jig 10, a large number of fixed anchors are placed. Without doing so, the direction in which the deformed rebar 2 extends (is routed) is orthogonal to the axial direction of the lock bolt 1. Therefore, the work on the existing spray layer 100 laminated on the inclined surface or the cut surface becomes easy, and the workability is improved.
Then, as described above, the deformed reinforcing bars 2 are arranged at right angles to the lock bolt 1, and by spraying a spraying material such as concrete or mortar, the pressure receiving force of the lock bolt 1 is received by the spraying material containing the deformed reinforcing bars 2. The plate 3 is easily produced while maintaining high quality.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, as shown in FIG. 1, the surface of the existing spray layer 100 is flat, whereas in the second embodiment, as shown in FIG. 7, unevenness or unevenness on the surface of the existing spray layer 200. Is carried out when is large.
Hereinafter, the second embodiment of FIGS. 7 and 8 will be described, mainly about the points different from the first embodiment of FIGS. 1 to 6.

In FIG. 7, the rock bolt 1 (ground reinforcement material) is inserted into the boring hole BH cut in the existing spray layer 200.
A reinforcing member holding jig 20 (lock bolt connecting coupler) is arranged near the ground-side end (upper end) of the lock bolt 1, and the reinforcing member holding jig 20 has a main body 20A. Is formed with a female screw (not shown), and the female screw is engaged with the male screw MS of the lock bolt 1. The reinforcing member holding jig 20 is fixed near the ground-side end (upper end) of the lock bolt 1 by screwing the female screw (not shown) and the male screw MS.
At the axial position of the lock bolt 1, a fixing nut 4 is screwed on the underground side adjacent to the main body portion 20A of the reinforcing member holding jig 20. A so-called “double nut” is configured by the fixing nut 4 and the female screw FS (see FIG. 8) of the main body portion 20A of the reinforcing member holding jig 20. The position of the lock bolt in the axial direction is fixed so that it does not change.

The reinforcing member holding jig 20 in FIG. 7 is shown in detail in FIG.
In FIG. 8, a female screw FS is formed on the main body portion 20A of the reinforcing member holding jig 20, and in addition, a fixing nut 4 is provided below the main body portion 20A.
As described above, the reinforcing member holding jig 20 having the female screw FS and the fixing nut 4 constitute a “double nut”.
However, the fixing nut 4 is not a component of the reinforcing member holding jig 20. In other words, the fixing nut 4 and the reinforcing member holding jig 20 are separate parts. However, the fixing nut 4 may be configured as a part of the reinforcing member holding jig 20.

In FIG. 8, the reinforcing member holding jig 20 includes a main body portion 20A formed with a female screw FS, an extending portion 20B extending radially outward from the main body portion 20A, and a radial direction of the extending portion 20B. The reinforcing member fixture 20C is provided near the outer end.
The structure of the reinforcing member holding jig 20 is the same as that of the reinforcing member holding jig 10 of the first embodiment shown in FIGS. 1 to 6.
In the second embodiment shown in FIGS. 7 and 8, as in the first embodiment, the deformed bar 2 is held by the reinforcing member fixture 20C of the reinforcing member holding jig 20, and at that time, the deformed bar 2 is locked. It is held orthogonal to the bolt 1. Further, the deformed bars 2 extending in two directions intersect each other at a right angle.

In FIG. 7, since the reinforcing member holding jig 20 constitutes a so-called “double nut” together with the fixing nut 4, the deformed reinforcing bar 2 held by the reinforcing member holding jig 20 is the shaft of the lock bolt 1. The position in the direction is fixed.
In this state, by spraying a spray material (for example, mortar/concrete), the pressure receiving plate 3 having the deformed reinforcing bar 2 (reinforcing member) built therein is formed.

According to the second embodiment of the present invention, even if the existing spray surface 200 has a large recess as shown in FIG. 7, it is reinforced by the so-called “double nut” structure including the reinforcing member holding jig 20 and the fixing nut 4. The axial position of the lock bolt 1 of the member holding jig 20 is fixed. Therefore, the axial direction of the lock bolt 1 of the reinforcing member holding jig 20 is prevented from changing.
Therefore, by appropriately adjusting the position of the reinforcing member holding jig 20 in the axial direction of the lock bolt 1, even if the unevenness on the existing spraying surface 200 is large, the deformed bar 2 is at an appropriate level (the axial position of the lock bolt). ), the distance from the surface of the existing spray material layer 200 to the deformed bar 2 (distance in the lock bolt axial direction) can be maintained at a certain value or more.

By spraying a spraying material such as concrete or mortar in that state, the deformed reinforcing bars 2 on the pressure receiving plate 3 are evenly positioned, and even if the existing spraying surface 200 has large irregularities or unevenness, the reinforcing bars are properly arranged to receive pressure. The plate 3 can be formed.
In other words, the pressure receiving plate 3 having the required strength as the pressure receiving plate 3 of the lock bolt 1 can be easily formed even if the surface of the existing spray layer 200 has large irregularities or unevenness.

Other configurations and operational effects of the second embodiment shown in FIGS. 7 and 8 are the same as those of the first embodiment shown in FIGS. 1 to 6, and redundant description will be omitted.

FIG. 9: has shown the modification of the reinforcement member fixing tools 10C, 20C, 30C in 1st-3rd embodiment.
In FIG. 9, the reinforcing member fixing tool 40C is made of a metal plate (for example, a steel plate), and is molded in a substantially semi-cylindrical shape with a partial area open. The reinforcing member fixture 40C includes a main body portion 40CA that surrounds the deformed rebar 2 (not shown in FIG. 9), an insertion portion 40CB that forms an opening that is an insertion port of the deformed rebar 2, and a reinforcing member insertion portion 40CB. It is provided with a protrusion 40CC which is cut out to project obliquely downward toward the insertion passage of the deformed rebar.
The insertion portion 40CB is configured so that the opening area decreases toward the main body portion 40CA.

When inserting the deformed reinforcing bar 2 from the insertion section 40CB, the deformed reinforcing bar 2 passes through the protruding section 40CC from the insertion section 40CB having a large opening, against the elastic repulsion force of the metal plate constituting the reinforcing member fixing tool 40C. , Can be easily accommodated in the main body portion 40CA with one touch.
On the other hand, the deformed rebar 2 accommodated in the main body portion 40CA interferes with the protrusion 40CC when the deformed rebar 2 tries to come off the main body portion 40CA, so that the deformed rebar 2 is prevented from coming off the reinforcing member fixing tool 40C.

It should be noted that the illustrated embodiment is merely an example and does not limit the technical scope of the present invention.
As described above, the main body portion 10A of the reinforcing member holding jig 10 is illustrated as having a circular planar shape, but the planar shape may be polygonal.

1... Rock bolt (ground reinforcement material)
2, 21, 22... Deformed bar (reinforcing member)
3... Pressure receiving plate 4... Fixing nut 5... Fixing plate 6... Fixing nuts 10, 20... Retaining member holding jig (lock bolt connecting coupler)
10A, 20A... Main body 10B, 20B... Extension parts 10C, 20C, 40C... Reinforcement member fixing tool 40CA... Reinforcement member fixing body 40CB... Insertion portion 40CC... Protrusions 100, 200... Existing spray layer BH... Boring hole

Claims (2)

A body portion (10A, 20A) configured so that the lock bolt (1) can penetrate therethrough;
An extending portion (10B, 20B) extending radially outward from the main body portion (10A, 20A) and a reinforcing member (2) provided on the extending portion (10B, 20B) and capable of holding the reinforcing member (2) The reinforcing member fixing tool (40C)
A female screw (FS) is formed on the main body (10A, 20A), and the female screw (FS) is screwed onto a male screw (MS) formed over the entire length of the lock bolt (1) in the longitudinal direction. Regarding the axial position of the lock bolt (1), the lock bolt (1) is fixed to a position on the ground side from the ground-side tip portion of
The reinforcing member fixing tool (40C) is made of a metal plate, is formed in a substantially semi-cylindrical shape with a partial region open, and has a main body (40CA) surrounding the reinforcing member (2) and a reinforcing member (2). Of the reinforcing member insertion portion (40CB) that constitutes an opening that is an insertion opening of the member, and a protruding portion (40CC) formed by notching a part of the reinforcing member insertion portion (40CB) and projecting it obliquely downward toward the main body portion (40CA). ), the opening area of the reinforcing member insertion portion (40CB) decreases toward the main body portion (40CA),
The main body portion (10, 20) is screwed into a male screw (MS) formed in the entire region of the lock bolt (1) in the longitudinal direction so that the main body portion (10, 20) is located at a position closer to the ground than the tip of the lock bolt (1) on the ground side. A jig for holding a lock bolt, comprising a fixing nut (4) screwed adjacent to the lock bolt . A spraying method using the lock bolt holding jig (10, 20) according to claim 1,
The female screw (FS) of the body portion (10A, 20A) of the lock bolt holding jig (10, 20) is screwed into the male screw (MS) formed in the entire region of the lock bolt (1) in the longitudinal direction. , The lock bolt (1) penetrates the main body portion (10A, 20A), and fixes the main body portion (10A, 20A) to a position on the ground side with respect to the tip on the ground side in the axial direction of the lock bolt (1),
Prior to screwing the female screw (FS) of the body portion (10A, 20A) of the lock bolt holding jig (10, 20) with the male screw (MS) of the lock bolt (1), a fixing nut ( 4) is screwed onto the male screw (MS) of the lock bolt (1), and the female screw (FS) of the main body portion (20A) of the lock bolt holding jig (20) is moved over the entire length of the lock bolt (1). screwed with the male thread (MS) formed in and upon securing the position of the ground side from the ground side tip of the lock bolt (1), the locking bolt holding the axial position of the lock bolt (1) use jig (20) adjacent and fixed to the locking nut (4),
From the insertion portion (40CB) of the reinforcing member fixing tool (40C) provided radially outward of the lock bolt holding jig (10), the reinforcing member (40C) is resisted against the elastic repulsive force of the reinforcing member fixing tool (40C). 2) is inserted, the protrusion (40CC) is passed through, and the main body (40CA) is accommodated and held,
A spraying method characterized by forming a pressure receiving plate (3) by spraying a spraying material.

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