JP2003221831A - Tightening device for bar-shaped member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tightening device for a bar-shaped member capable of securely catching a bar-shaped member and giving a tension even when a fibrous bar-shaped member or the like, for instance, as a tendon for an anchor or other structures used for reinforcing method is selected. <P>SOLUTION: The tightening device 8 is used for a bar-shaped member 5. A plurality of slits j are formed in a hollow male screw member 32 provided with an insertion hole 31 of the bar-shaped member 5 in the central part, with a peripheral distance, from one end side to the other end side. The structure is so constituted that a divided screw 32a between slits j, j is widened as it goes to the one end side and the divided screw 32a is contracted as a female screw 33 advances from the other end of the male screw to one end side. Further, the structure is provided with a catching means 34 in the diametral direction for the member 5 in accordance with the diametral contraction of the divided screw 32a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fastening device for a rod-shaped member.

[0002]

2. Description of the Related Art As one of the construction methods for reinforcing slopes such as roads and landscaping, after laying a mesh body such as a wire mesh on the slope, arranging reinforcing bars and coils in a grid pattern on the mesh body, After this, there is a construction method in which mortar is sprayed so as to fill the grid-shaped reinforcing bars and coils, and a grid-shaped method frame containing reinforcing bars is constructed on the slope.

According to this construction method, since the method frame has a lattice shape and is continuous in the vertical and horizontal directions, it is possible to exert a strong resistance against the peeling of the surface layer of the slope surface.

However, in the above-mentioned construction method, the resistance force for suppressing the peeling off of the surface layer of the slope depends only on the weight of the lattice-shaped slope frame made of mortar, so that the resistance force may be insufficient on a steep slope. From this, the present inventor came up with the idea of installing an anchor at the intersection of the grid-shaped reinforcing bars.

That is, at the intersection of the grid-like reinforcing bars, a hole for anchor installation is drilled so as to reach the hard ground, the anchor is inserted through this anchor hole, and further, the anchor hole is filled with grout to anchor it. While fixing the anchor, a spacer structure for fixing the anchor is installed so that the head of the anchor is exposed on the upper side of the grid-shaped method frame by spraying mortar, and then the nut is screwed onto the anchor. , This nut is screwed so that it comes into contact with the bearing member of the spacer structure, and further the nut is screwed to compact the anchor, so that the bearing member acts as a reaction member and tension is applied to the anchor. It is applied and the tension applied to the anchor is transmitted to the ground.

According to this construction method of introducing the anchor, the anchor exhibits a large resistance force to prevent the anchor from falling off, so that even if the slope is a steep slope, it can be applied to the construction of the grid-shaped slope. Becomes

[0007]

However, depending on the slope, it may take a large number of long anchors to reach the anchor to a deep hard ground, and as an anchor, generally, a nut is used. For example, a threaded bar that can be screwed is used. However, the threaded bar becomes heavier as it becomes longer, so that there is room for improvement in terms of handling and workability.

As a result of further intensive research and development, the present inventor has improved handling and workability by selecting a non-metallic lightweight rod-shaped member such as fiber as the anchor. In addition to that, it is concluded that it is suitable in that rust prevention treatment is unnecessary.

However, in the case of using the threaded bar as the anchor, by screwing the nut onto the bar,
Although it is possible to easily apply tension to the anchor, it is technically impossible to tighten the nut with a rod-shaped member made of fiber, etc., and it is not possible to apply tension to the rod-shaped member. There was no way to make it happen.

From another point of view, when a non-metallic rod-shaped member such as a fiber is used as a tension material for prestressed concrete structures or a tension material for joining marine structures, the same problem as described above occurs. there were.

The present invention has been made in view of the above circumstances, and an object thereof is to securely clamp even a non-metallic rod-shaped member such as a fiber so as to apply tension. An object of the present invention is to provide a fastening device for a rod-shaped member that can be applied.

[0012]

[Means for Solving the Problems] That is, in the fastening device for a rod-shaped member according to the present invention, a female screw member is brought into contact with a bearing member such as a spacer structure or other structure to tension the rod-shaped member made of fiber or the like. A plurality of slits are formed at intervals in the circumferential direction and from one end side to the other end side in a hollow male screw member having a rod-shaped member insertion hole in the center thereof. In addition, while increasing the diameter of the split screw portion between the slits toward the one end side, the split screw portion is configured to be reduced in diameter as the female screw member is screwed from the other end side of the male screw member to the one end side. It is characterized in that it is provided with a rod-shaped member clamping means for clamping the rod-shaped member in the diametrical direction in accordance with the reduction in diameter of the split screw portion (claim 1).

The rod-shaped member clamping means may be a member which is integrally formed with the divided screw portion and clamps the surface portion of the rod-shaped member as the diameter of the divided screw portion decreases (claim 2). ).

In addition to the above, a split ring which is interposed between the rod-shaped member and the expanded threaded portion and is reduced in diameter as the divided threaded portion is reduced (claim) Item 3), further, is interposed between the rod-shaped member and the expanded threaded portion, and is compressed and deformed between the threaded portion and the bar-shaped member as the diameter of the threaded portion decreases, and Alternatively, the elastic member may be configured to press the surface portion of the rod-shaped member (claim 4).

According to the above construction, while the rod-shaped member is being inserted through the insertion hole of the male screw member, one end side of this male screw member is brought into contact with the bearing member, and the other end side of the male screw member is directed toward the one end side. When the female screw member is screwed forward, the split screw portion of the male screw member is reduced in diameter as the female screw member is screwed, so that the rod-shaped member is sandwiched by the sandwiching means in the diametrical direction.

By this sandwiching, the male screw member and the rod-shaped member are integrated with each other. Here, the female screw member is further screwed to bring the female screw member into contact with the bearing member, and further in this state. When the female screw member is threaded, tension is applied to the rod-shaped member by using the pressure bearing member as a reaction point.

Therefore, according to the fastening device having the peculiar structure according to the present invention, even a rod-shaped member to which a nut cannot be screwed can be applied with tension. By selecting a lightweight rod-shaped member such as a fiber as an anchor used in the construction method or a tension member for other structures, improvement in handling and workability can be achieved.

When the female screw member is screwed to reduce the diameter of the split screw portion, it is desirable that the fastening device having the above-mentioned structure is provided with a co-rotation preventing means for the male screw member in association with the screwing of the female screw member. (Claim 5) As this co-rotation preventing means, the rod-shaped member has an elliptical cross-sectional shape, while the insertion hole formed at the center of the male screw member is locked to the elliptical peripheral surface of the rod-shaped member. For forming the rod-shaped member, a form for forming a shape that prevents rotation of the rod (claim 6), or a locking portion that locks at least one of the split screw portions in a state where the diameter reduction of the split screw portion is allowed. The form (claim 7) formed in the pressure bearing member can be selected.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the construction status of the grid-like method frame 2 with reinforcing bars by spraying mortar (or concrete) 1 onto the slope N, and at this time, strong resistance to peeling of the slope surface layer. In order to develop the force, the spacer structure 4 for introducing the anchor is installed at the intersection of the reinforcing bars 3 and 3 arranged in a grid pattern.

This spacer structure 4 exposes the head of the anchor 5 on the upper side of the lattice-shaped method frame 2, and as shown in FIG. 3, a mounting face plate 6 on the slope N side, The anchor insertion space (see FIG. 2) P is provided with a constituent member 7 and a receiving face plate 9 of a fastening device 8 mounted on the head side of the anchor 5.

Specifically, the spacer structure 4 is made of metal (otherwise, reinforced plastic, ceramic, concrete, etc. are arbitrarily selected), and the mounting face plate 6 on the slope N side is used. The receiving surface plate 9 of the fastening device 8 is composed of a flat plate member, and one receiving surface plate 9 is formed with an anchor insertion hole a slightly larger than the outer diameter of the anchor 5, and the other mounting surface plate 9 is formed. An anchor insertion hole b, which is larger than the anchor insertion hole a, is formed in the placing plate 6.

The constituent member 7 of the anchor insertion space P
As the inner diameter of the upper side and the inner diameter of the lower side, a cylindrical member having a downward expansion shape having substantially the same inner diameters as the anchor insertion holes a and b is selected, and the constituent member 7 is fixed to the receiving face plate 9 and the placing face plate 6. And are coaxially provided around the anchor insertion holes a and b.

In this embodiment, the spacer structure 4 is of a split type so that the spacer structure 4 can be easily handled. That is, the anchor insertion space P
While the component 7 forming the above and the receiving face plate 9 are integrated by, for example, welding, a locking piece for fitting and holding the above-mentioned component 7 in a positioned state on the mounting face plate 6 which is a separate body e is provided.

Next, an example of the procedure for constructing the grid-shaped method frame 2 with reinforcing bars by spraying the mortar 1 will be described with reference to FIGS. 1 and 2. First, if necessary, a method in which the leveling work is carried out beforehand is carried out. On the surface N, a mesh body 11 having a mesh size of about 5 to 6 cm, such as a rhombic wire mesh, is laid, and the auxiliary anchors 12 are driven into the slope surface N at appropriate intervals. Fixed to.

An anchor hole 13 that reaches deep hard ground is formed at a portion corresponding to an intersection of the reinforcing bars 3 and 3 arranged in a grid pattern, and the anchor hole 13 has an opening if necessary. By pushing a stuffing such as waste into the part, it prevents falling of earth and sand into the anchor hole 13, and
The base mortar 14 is supplied around the anchor hole 13, and the surface thereof is flattened so as to be perpendicular to the central axis of the anchor hole 13, and the flat surface is used as the installation portion S of the spacer structure 4. Remove the padding.

Next, the anchor 5 is set to a length such that its head is exposed to the upper side of the spacer structure 4, and this is inserted into the anchor hole 13, and the anchor hole 13 has its upper surface higher than the slope N. The grout (cement milk) 15 is injected in a state of being restrained so that the anchor 5 is fixed to the ground.

Next, a receiving surface member 16 made of a steel plate having an anchor insertion hole c which is slightly larger than the outer diameter of the anchor 5 formed in the central portion has a shape larger than that of the mounting surface plate 6 of the spacer structure 4. In the state in which the anchor 5 is inserted into the anchor insertion hole c, the receiving surface material 16 is attached to the spacer structure 4.
The anti-slip anchor 17 is appropriately placed in the state where the anchor insertion hole c and the anchor hole 13 are substantially aligned with each other in the installation portion S.

Subsequently, the mounting face plate 6 of the spacer structure 4 is arranged on the receiving face material 16 so that the anchor 5 is inserted through the anchor insertion hole b, and the receiving face plate 9 integrally provided with the component member 7 is provided. With the anchor 5 inserted through the anchor insertion hole a and the component 7 is positioned above the mounting face plate 6 while being positioned by the locking piece e.

Next, spray mortar 1 and anchor 5
The length of the cylindrical body 20 for cutting the edge of the grout 15 is set to reach the surface of the grout 15, and the flange i of the cylindrical body 20 is seated on the receiving plate 9 while the anchor 5 is covered with the spherical washer. 21 is fitted and held, and the anchor 5
By attaching the fastening device 8 to the, tightening it, using the spherical washer 21 as a reaction force member to tension the anchor 5, and transmitting this tension to the ground, a strong resistance force against the peeling of the slope surface layer is obtained. It is made to express.

Then, as appropriate, while covering the head of the anchor 5 including the fastening device 8 with the protective cap C, in parallel with the above work, the two reinforcing bars 3 and 3 sandwich the spacer structure 4, and , Are arranged on the net-like body 11 so as to have a lattice shape on the entire slope, and when the reinforcing bars 3 and 3 are arranged,
In order to hold the rebars 3 and 3 slightly above the slope N,
The frame bodies 22 for forming the method frame are installed at intervals in the longitudinal direction of the reinforcing bars 3, 3.

The frame body 22 for forming the normal frame is composed of a combination structure of reinforcing bars by welding, and has a pair of semicircular frame members 23, 23 and a connecting member for integrating the frame members 23, 23. 24, 24 and the connecting members 24, 2
It consists of four reinforcing bar holding members 25, 25.

The frame body 22 for forming the normal frame has a height of about 15 to 20 cm, a width of about 30 cm, and a length of about 30 to 60 cm, and the reinforcing bar holding member 25. The position holding parts h, h of the reinforcing bars 3, 3 arranged in parallel are formed in an inverted V shape.

According to the above construction, the reinforcing bars 3 and 3 are sloped to the slope N.
The reinforcing bars 3 and 3 are arranged in a grid pattern and the frame 22 is installed so as to straddle the reinforcing bars 3 and 3.
It is possible to hold the reinforcing bars 3 and 3 at a predetermined height position on the slope N by lifting the reinforcing bars 3 and 3 to the side and binding them to the reinforcing bar holding member 25 with a wire or the like.

Next, the curing sheet 26 is arranged on the mesh body 11 in this region so that the region surrounded by the grid-shaped reinforcing bars 3 and 3 serves as a vegetation region, and the frame 22 for forming the method frame is formed. The mortar 1 is sprayed onto the lattice-shaped reinforcing bars 3 and 3 and the frame 22 for forming the normal frame by using the spray width and the spray height of the mortar 1 as guides and embedding the spacer structure 4. .

If necessary, the cap C is removed after the mortar 1 is cured for a predetermined period of time, and the fastening device 8 provided on the anchor 5 is retightened, and the spherical washer 21 is used as a reaction member to further tighten the anchor 5. Therefore, a stronger resistance force against the peeling of the slope surface layer is expressed, and the curing sheet 26 is removed in parallel with the fastening of the fastening device 8.
By spraying the thick layer base material 27 for vegetation including plant seeds onto the vegetation area, the construction of slope reinforcement by the grid-like method frame 2 with reinforcing bars accompanied by greening is completed, and if necessary, final Therefore, the head of the anchor 5 including the fastening device 8 is covered with the above-mentioned removed protective cap C.

According to the above-mentioned slope reinforcement construction, the resistance force against the peeling off of the slope surface layer is reduced by the lattice-shaped slope frame 2 by the mortar 1.
In addition to relying on the weight of the anchor, the anchor 5 exerts a large resistance force against delamination, so that the stability of the slope 5 is maintained even on a steep slope N or on a ground having a small bearing capacity. Can be effectively achieved.

Further, since the fastening device 8 for the anchor 5 is exposed to the upper side of the lattice-shaped method frame 2, the fastening device 8 is provided.
In addition to stabilizing the slope N during the construction by tightening, the post-work for the anchor 5 such as refastening of the fastening device 8 can be easily performed even after the grid-shaped frame 2 is formed by the mortar 1. it can.

Here, in this embodiment, the anchor 5
As the material, a lightweight fiber rod-shaped member that is excellent in handling and workability is selected. Specifically, as shown in FIG. 4, for example, synthetic resin fiber 28 such as aramid fiber or FRP fiber is solidified with an epoxy resin. In addition to the above, similarly, a string-like fiber 29 made of, for example, aramid fiber is wound around the surface portion and solidified with an epoxy resin to form a fiber rod-shaped member as the anchor 5. The cross-sectional shape of No. 5 is formed into an elliptical shape.

Since the means for introducing the anchor by the rod-shaped member 5 cannot be compacted by a simple nut as described above, in order to enable the compaction of the anchor by the rod-shaped member 5, The fastening device 8 is configured as follows.

That is, this fastening device 8 is made of metal, and is hollow with the insertion hole 31 for the rod-shaped member 5 in the center as shown in FIGS. 5 and 6A and 6B. Of the male screw member 32 and a female screw member 33 screwed to the male screw member 32, and a plurality of male screw members 32 are circumferentially spaced from the one end side to the other end side. The slit j is formed so that the male screw member 32 has a larger diameter toward the one end side.
It is configured such that the diameter a is tapered, and thus the diameter of the split screw portion 32a is reduced as the female screw member 33 is screwed from the other end side to the one end side of the male screw member 32.

The anchor insertion hole 31 is straightened so that the insertion hole 31 of the rod-shaped member 5 is slightly larger than the elliptical rod-shaped member 5 in the state where the diameter of the split screw portion 32a is expanded as described above. It is formed into an elliptical shape, and the split screw part 3
The thick portion d is formed on one end side of 2a.

The thick portion d is for sandwiching the rod-shaped member 5 in the diametrical direction as the dividing screw portion 32a is reduced in diameter. The thick portion d formed integrally with the dividing screw portion 32a, that is, The sandwiching member constitutes the sandwiching means 34 for the rod-shaped member 5.

According to the above configuration, FIGS. 7 (A) and 7 (B)
As shown in, the one end side of the male screw member 32 is attached to the spherical washer 21.
When the male screw member 32 is inserted into the rod-shaped member 5 so as to be seated on the male screw member 32 and the female screw member 33 is screwed toward the one end side from the other end side of the male screw member 32, as shown in FIG. , The divided screw portion 32 as the female screw member 33 is advanced.
When the diameter of a is reduced, the holding member d of the holding means 34 holds the rod-shaped member 5 in the diameter direction.

At this time, as shown in FIG. 8B, since the insertion hole 31 of the male screw member 32 has an elliptical shape in accordance with the elliptical shape of the rod member 5, the male screw member 32 with respect to the rod member 5 is formed. Of the male screw member 3 with respect to the rod-shaped member 5 is that the pinching member d of the pinching means 34 pinches the rod-shaped member 5.
The integration of the two is achieved, and thereafter, the internal thread member 33 is further screwed to bring the internal thread member 33 into contact with the spherical washer 21.
When the rod-shaped member 5 is screwed, the spherical washer 21 seated on the receiving surface plate 9 of the spacer structure 4 serves as a bearing member and is tensioned with the bearing member 21 as a reaction force point.

That is, according to the fastening device 8 having the above structure, even if the anchor is made of the lightweight rod-shaped member 5 made of fiber or the like, from another point of view, the tension member of the prestressed concrete structure or the joining of the marine structure is joined. As tension material for
Even when a non-metallic rod-shaped member such as a fiber is used, the rod-shaped member 5 can be compacted, and handling and workability can be improved.

Incidentally, m in the figure in FIG. 7 is, for example, an epoxy-based curing agent, which is supplied to the mounting portion of the male screw member 32 to the rod-shaped member 5 as required. The hardening of m makes the rod-shaped member 5 and the male screw member 32 more integrated.

In the above embodiment, the rod-shaped member 5 has an elliptical cross-sectional shape while the male screw member 32 has the insertion hole 3 formed therein.
As for No. 1 as well, it is made into an elliptical shape for locking the male screw member 32 on the elliptical circumferential surface of the rod member 5 to prevent the male screw member 32 from rotating, and a co-rotation preventing means 35 for the male screw member 32 accompanying the screwing of the female screw member 33. However, the present invention is not limited to this configuration.

That is, as shown in FIG. 9, in the state where the diameter reduction of all the split screw portions 32a is allowed, the split screw portions 32a are
Also in the female screw member 33, the locking portion n that locks one of the two (in this embodiment, the two facing each other) is formed in the bearing member (spherical washer 21) for mounting the rod-shaped member. The co-rotation preventing means 35 of the male screw member 32 can be used.

Further, as the pinching means 34 for the rod-shaped member 5,
As shown in FIG. 10, it is possible to implement the structure in which the sandwiching member d is projected to the inner surface side of the one end side of the split screw portion 32a. Besides, as shown in FIG. 11, the split screw portion 32a is also possible.
The elastic member t made of, for example, hard rubber, which is compressed and deformed between the split screw portion 32a and the rod-shaped member 5 and presses the surface portion of the rod-shaped member 5 according to the diameter reduction of a, is expanded with the rod-shaped member 5. The elastic member t can also be implemented by interposing it between the divided screw portion 32a and the rod-shaped member 5a.
It is possible to select a sheet-like member to be wound around the surface portion of, or a cylindrical member to cover the surface portion of the rod-shaped member 5 as shown in this embodiment.

Further, in place of the elastic member t, as shown in FIG. 12, a split ring r made of, for example, metal (others, such as synthetic resin) whose diameter is reduced in accordance with the diameter reduction of the split screw portion 32a.
11 can be implemented by interposing between the rod-shaped member 5 and the expanded threaded portion 32a.
In the configuration shown in (1), the dividing screw portion 32a may be formed to have a constant thickness so as to eliminate the sandwiching member d.

[0051]

As described above, according to the present invention,
In order to improve handling and workability, even if a bar-shaped member made of, for example, fiber is selected as an anchor used for the slope reinforcement method or a tension material for other structures, There is provided a rod-shaped member fastening device capable of securely sandwiching a rod-shaped member and applying tension thereto.

[Brief description of drawings]

FIG. 1 is a perspective view showing a construction state of a grid-shaped method frame with reinforcing bars by spraying mortar.

FIG. 2 is an explanatory diagram of installation of a spacer structure.

FIG. 3 is an exploded perspective view of a spacer structure for introducing an anchor.

FIG. 4 is a partial perspective view of an anchor made of a fiber rod member.

FIG. 5 is a perspective view of a male screw member.

FIG. 6A is a vertical sectional view of the male screw member, and FIG. 6B is a transverse sectional view of the male screw member.

FIG. 7A is an exploded cross-sectional view of an anchor fastening device,
(B) is a sectional view showing a compacted state of the anchor.

8A is a sectional view showing a compacted state of an anchor by a fastening device, and FIG. 8B is a sectional view taken along line XX of FIG. 8A.

FIG. 9 is an exploded perspective view of a co-rotation preventing unit according to another embodiment.

FIG. 10 is a cross-sectional view showing a modified example of the sandwiching means.

FIG. 11 is a cross-sectional view of a sandwiching means according to another embodiment.

FIG. 12 is a perspective view of a split ring for forming a sandwiching means of a modified example.

[Explanation of symbols]

5 ... Rod-shaped member, 21 ... Pressure bearing member, 31 ... Insertion hole, 32 ...
Male screw member, 32a ... Dividing screw portion, 33 ... Female screw member,
34 ... Clamping means, 35 ... Co-rotation preventing means, d ... Clamping member, j ... Slit, n ... Locking part, r ... Split ring, t ...
Elastic member.

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Claims (7)

[Claims] 1. A plurality of slits are formed in a hollow male screw member having an insertion hole of a rod-shaped member at the center thereof at intervals in the circumferential direction and from one end side to the other end side. The divided screw part is expanded toward the one end side, and the divided screw part is reduced in diameter as the female screw member is screwed from the other end side of the male screw member to the one end side. A rod-shaped member fastening device, comprising rod-shaped member holding means for holding the rod-shaped member in the diametrical direction according to the diameter. 2. The pin-shaped member clamping means comprises a member which is integrally formed with the dividing screw part and clamps the surface part of the rod-shaped member according to the reduction in diameter of the dividing screw part. Fastening device for rod-shaped members. 3. The pin-shaped member clamping means comprises a split ring which is interposed between the rod-shaped member and the expanded threaded portion and whose diameter is reduced as the diameter of the threaded portion is reduced. Item 1. A fastening device for a rod-shaped member according to item 1. 4. A rod-shaped member sandwiching means is interposed between the rod-shaped member and the expanded threaded portion, and between the threaded portion and the bar-shaped member as the diameter of the threaded portion is reduced. Compressed and deformed with
The fastening device for a rod-shaped member according to claim 1, further comprising an elastic member that presses a surface portion of the rod-shaped member. 5. The rod-shaped member fastening device according to claim 1, further comprising co-rotation preventing means for the male screw member in association with the screwing of the female screw member. 6. The co-rotation preventing means comprises a rod-shaped member having an elliptical cross-sectional shape, and an insertion hole formed at the center of the male screw member is locked to the elliptical peripheral surface of the rod-shaped member. The rod-shaped member fastening device according to claim 5, wherein the device is formed in a shape that prevents rotation of the member. 7. A pressure bearing member for mounting a rod-shaped member, comprising: a locking portion that locks at least one of the split screw portions in a state where the diameter reduction of the split screw portion is allowed in the co-rotation preventing means. The rod-shaped member fastening device according to claim 5 or 6, wherein the fastening device is a rod-shaped member.