JP5611148B2 - Shear reinforcement method and auxiliary device for reinforced concrete structure - Google Patents

Description

  The present invention relates to a shear reinforcement method and an auxiliary device for a reinforced concrete structure.

  After drilling the reinforcing member insertion hole for an existing reinforced concrete structure with insufficient shear strength (hereinafter, reinforced concrete may be referred to as “RC”), the shear reinforcing member is inserted into the reinforcing member insertion hole. A shear reinforcement method for an RC structure in which a filler is injected while being inserted is known (see, for example, Patent Document 1 or Patent Document 2).

  As a shear reinforcement member used in the conventional shear reinforcement method for RC structures, it is general that the main component is a deformed bar.

Japanese Patent Application No. 2003-113673 Japanese Patent No. 3668490

  If the construction space is restricted, such as a road structure in service or a common groove, or if the member thickness of the part to be reinforced is larger than the construction space, deformed reinforcing bars that do not have flexibility In some cases, the main shear reinforcement member could not be inserted.

  In this way, when sufficient construction space cannot be secured for the length of the shear reinforcement member, installation may be performed by connecting the short divided reinforcing bars to the reinforcement member insertion hole while connecting with mechanical joints etc. is there. However, this shear reinforcement method has problems such as time-consuming work and increased costs for mechanical joints.

  In addition, if traffic restrictions on the roads in service and replacement of existing facilities in the common ditch are performed in order to secure the construction space necessary for shear reinforcement, there is a problem that the construction period becomes longer and the cost increases.

  From such a point of view, the present invention enables a construction in a limited construction space, and provides a method for reinforcing a shear reinforcement of a reinforced concrete structure and an auxiliary that can improve the shear strength of an existing reinforced concrete member easily and inexpensively. It is an object to provide an apparatus.

  In order to solve the above-mentioned problems, a method for shear reinforcement of a reinforced concrete structure according to the present invention includes a drilling step of drilling a reinforcement member insertion hole in an existing reinforced concrete structure, and inserting a shear reinforcement member into the reinforcement member insertion hole. And a filling step of injecting a filler into the reinforcing member insertion hole, wherein the shear reinforcing member is mainly composed of a flexible wire, and the reinforcing member insertion hole An auxiliary device having a guide portion protruding from the reinforcing member insertion hole is installed in the hole opening, and the shear reinforcing member is pressed against the inner wall surface of the guide portion in the placement step. Yes.

According to the shear reinforcement method for such a reinforced concrete structure, since the shear reinforcement member has flexibility, it can be inserted into the reinforcement member insertion hole even when the construction space is limited.
In addition, since the auxiliary device is installed at the hole of the reinforcing member insertion hole, even when the shear reinforcing member is inserted from the direction intersecting the axial direction of the reinforcing member insertion hole, Is guided to the inside of the reinforcing member insertion hole, so that the workability is excellent.

  In the method for shear reinforcement of a reinforced concrete structure, a protruding member may be provided on an outer surface of the wire of the shear reinforcing member, and the protruding member may be brought into contact with an inner wall surface of the reinforcing member insertion hole in the arranging step. If the wire comes into contact with the inner wall surface of the reinforcing member insertion hole, the adhesion performance between the filler and the inner wall surface may be hindered, but if the projecting member is brought into contact with the inner wall surface, the wire comes into contact with the inner wall surface Can be prevented.

  The auxiliary device of the present invention guides the shear reinforcing member when inserting the shear reinforcing member into the reinforcing member insertion hole drilled in the existing reinforced concrete, and includes a main body portion and the reinforcing member inserted. It is characterized by comprising a half-cylindrical guide portion arranged in a state protruding from the hole.

  According to such an auxiliary device, even when the shear reinforcement member is inserted from the direction intersecting the axial direction of the reinforcement member insertion hole, the reinforcement member is pressed by pressing the shear reinforcement member against the half cylindrical guide portion. Since it is guided to the insertion hole, the workability is improved.

  If the main body portion of the auxiliary device is inserted into the reinforcing member insertion hole and formed so that the outer width becomes smaller toward the depth of the reinforcing member insertion hole, the auxiliary device is installed in the reinforcing member insertion hole. Becomes easy.

  In addition, if the outer surface of the main body portion includes a contact plate portion having an outer width formed larger than the inner diameter of the reinforcing member insertion hole, the auxiliary device can be provided upright at the hole opening of the reinforcing member insertion hole. Can be installed easily.

  If a slit having a width larger than the outer diameter of the wire constituting the shear reinforcement member is formed in the main body, a fixing member having a width larger than the wire is formed at the rear end of the shear reinforcement member. Even if it is a case, it becomes possible to remove an auxiliary device easily.

  If a receiving lid is formed on one end face of the guide portion, the filler injected into the reinforcing member insertion hole can be prevented from spilling, and thus the workability is further improved.

  According to the shear reinforcement method and auxiliary device for a reinforced concrete structure of the present invention, it is possible to perform construction in a limited construction space, and it is possible to improve the shear strength of an existing reinforced concrete member simply and inexpensively. .

(A) And (b) is sectional drawing which shows each procedure of the shear reinforcement method of the concrete structure which concerns on 1st embodiment. (A) is a perspective view which shows the auxiliary device which concerns on 1st embodiment, (b) is sectional drawing which shows the attachment condition of an auxiliary device, (c) is a perspective view which shows the installation state of an auxiliary device. (A) And (b) is sectional drawing which shows each procedure following (b) of FIG. (A) is a perspective view which shows the front-end | tip fixing member of a shear reinforcement member, (b) is a perspective view which shows the base end fixing member. (A) is sectional drawing which shows a shear reinforcement member provided with a protrusion member, (b) is an enlarged view which shows a protrusion member. It is sectional drawing which shows the example which the wire rod contact | connected to the inner wall face of the reinforcement member insertion hole. (A) is a perspective view which shows the auxiliary | assistant apparatus which concerns on 2nd embodiment, (b) is sectional drawing. (A) is a perspective view which shows the auxiliary | assistant apparatus which concerns on 3rd embodiment, (b) is sectional drawing. It is a perspective view which shows the auxiliary device which concerns on 4th embodiment.

  The shear reinforcement method for a reinforced concrete structure according to the present embodiment includes a drilling step, an arrangement step, and a filling step.

The drilling step is a step of drilling the reinforcing member insertion hole 2 in an existing reinforced concrete structure (hereinafter simply referred to as “RC structure”) 1 as shown in FIG.
Although the drilling method of the reinforcing member insertion hole 2 is not limited, for example, a leg drill or a core drill may be used.

The reinforcing member insertion hole 2 of the present embodiment has a bottom and is formed in a direction orthogonal to the surface of the RC structure 1. The bottom portion of the reinforcing member insertion hole 2 has a thickness that can secure a predetermined concrete covering.
The shape of the reinforcing member insertion hole 2 is not limited. For example, you may incline with respect to the surface of RC structure 1, and it does not necessarily need to be bottomed.

  Another structure 3 is adjacent to the RC structure 1. The width (construction space) X of the gap between the RC structure 1 and the other structure 3 is smaller than the depth T of the reinforcing member insertion hole 2.

  When the reinforcing member insertion hole 2 is drilled in the RC structure 1, the auxiliary device 10 is installed in the hole of the reinforcing member insertion hole 2.

As illustrated in FIG. 2A, the auxiliary device 10 according to the present embodiment includes a main body 11 and a guide 12.
The auxiliary device 10 guides the shear reinforcement member 20 into the reinforcement member insertion hole 2 when the shear reinforcement member 20 is inserted into the reinforcement member insertion hole 2 (see FIG. 1B).

As shown to (a) of FIG. 2, the main-body part 11 is formed with the slit 13, and is exhibiting cross-sectional arc shape (C shape).
The slit 13 has a width larger than the outer diameter of the wire 21 constituting the shear reinforcement member 20.

  The guiding portion 12 has a cross-sectional arc shape whose arc length is shorter than that of the main body portion 11 and has a half-cylindrical shape.

  The auxiliary device 10 is made of a flexible material such as a synthetic resin material.

Installation of the auxiliary device 10 at the hole of the reinforcing member insertion hole 2 is performed in a state where a pressing force is applied from the side of the main body 11 to narrow the width of the slit 13.
When the width of the slit 13 is narrowed and the outer diameter d1 of the main body 11 is made smaller than the inner diameter D of the reinforcing member insertion hole 2, as shown in FIG. Easy to insert.

  When the main body 11 is inserted into the reinforcing member insertion hole 2 for a predetermined length, the pressing force is released. By doing so, since the outer diameter of the auxiliary device 10 is increased, the auxiliary device 10 is fixed to the well opening of the reinforcing member insertion hole 2. In addition, the main-body part 11 is exhibiting the cylinder shape in the state inserted in the reinforcement member insertion hole 2. As shown in FIG. At this time, the width of the slit 13 is smaller than the outer diameter of the wire 21, but the slit 13 may have a width larger than the outer diameter of the wire 21 when it is inserted into the reinforcing member insertion hole 2. .

As illustrated in FIG. 2C, the auxiliary device 10 is arranged so that the guide portion 12 protrudes from the reinforcing member insertion hole 2.
At this time, the guiding portion 12 is arranged so that the inner wall surface faces the proximal side where the shear reinforcement member 20 is inserted.

  The placement step is a step of inserting the shear reinforcement member 20 into the reinforcement member insertion hole 2 as shown in FIG.

The insertion of the shear reinforcement member 20 into the reinforcement member insertion hole 2 is limited in the construction range due to the distance from other structures 3 as shown in FIG. This is performed by pushing the shear reinforcement member 20 from the direction intersecting with the axial direction.
When the shear reinforcement member 20 is pressed against the inner wall surface of the guide portion 12, the shear reinforcement member 20 is guided into the reinforcement member insertion hole 2 by the auxiliary device 10.

  The shear reinforcement member 20 includes a wire 21, a distal fixing member 22 formed at the distal end of the wire 21, and a proximal fixing member 23 formed at the proximal end of the wire 21.

The shear reinforcement member 20 has a length larger than the width X of the construction space, and as shown in FIG. It has a length that can secure the concrete covering.
In addition, the length of the shear reinforcement member 20 is not limited.

The wire rod 21 of this embodiment is comprised with the strand from PC steel. Since the wire 21 has flexibility, as shown in FIG. 1B, the wire 21 can be bent. Therefore, even when the construction space is limited, the wire 21 is reinforced. It can be inserted into the insertion hole 2.
The material constituting the wire 21 is not limited as long as it has flexibility and exhibits a function as a reinforcing material. For example, the wire 21 is made of a carbon wire or the like. Also good.

  The tip fixing member 22 is a member that improves the fixing property of the shear reinforcement member 20, and is larger than the outer diameter of the wire 21 and the inner diameter of the reinforcing member insertion hole 2 as shown in FIG. Have a smaller width dimension.

  The proximal end side (the wire 21 side) of the distal fixing member 22 is flat, and the distal end side (the side opposite to the wire 21) of the distal fixing member 22 has a hemispherical shape.

The configuration of the front end fixing member 22 is not limited. For example, you may comprise by fixing a flat plate to the front-end | tip of the wire 21. FIG.
The front-end fixing member 22 may be installed as necessary. For example, the tip fixing member 22 may be omitted when the wire 21 can ensure a predetermined fixing length.

The proximal fixing member 23 is a member that improves the fixability of the shear reinforcement member 20, and has a width that is larger than the outer diameter of the wire 21 and smaller than the inner diameter of the reinforcing member insertion hole 2. .
As shown in FIG. 4B, the proximal fixing member 23 of the present embodiment is configured by a rectangular flat plate.

The configuration of the proximal fixing member 23 is not limited, and may be configured by a circular flat plate, for example.
The proximal fixing member 23 may be installed as necessary. For example, the proximal fixing member 23 may be omitted when the wire 21 can secure a predetermined fixing length.

  In the arranging step, the auxiliary device 10 is extracted from the hole of the reinforcing member insertion hole 2 when the shear reinforcing member 20 is inserted into the reinforcing member insertion hole 2 for a predetermined length.

  When the auxiliary device 10 is extracted, the wire 21 of the shear reinforcement member 20 is passed through the slit 13. When the inner diameter of the auxiliary device 10 is larger than the width of the proximal fixing member 23, the auxiliary device 10 may be extracted while the proximal fixing member 23 is passed through the inner space of the auxiliary device 10. The auxiliary device may be extracted after the shear reinforcement member 20 is disposed inside the reinforcement member insertion hole 2.

  When the auxiliary device 10 is extracted, the shear reinforcement member 20 is pushed in until the front-end fixing member 22 contacts the bottom surface of the reinforcement member insertion hole 2.

The filling step is a step of injecting a filler 30 into the reinforcing member insertion hole 2 in which the shear reinforcing member 20 is disposed, as shown in FIG.
In the present embodiment, grout is used as the filler 30, but the filler 30 is not limited as long as the shear reinforcement member 20 and the RC structure 1 can be firmly integrated. Epoxy resin, cement-based milk or cement-based mortar may be used.

  When the filler 30 is cured, the shear reinforcement member 20 is integrally fixed in the RC structure 1.

  According to the shear reinforcement method for a reinforced concrete structure of the present embodiment, since the auxiliary device 10 is installed at the hole of the reinforcement member insertion hole 2, the shear reinforcement member from the direction intersecting the axial direction of the reinforcement member insertion hole 2. Even when 20 is inserted, the shear reinforcement member 20 is guided to the inside of the reinforcement member insertion hole 2 by the auxiliary device 10 by pressing the shear reinforcement member 20 against the guide portion 12, so that the workability is excellent. ing.

  Further, since the shear reinforcement member 20 has flexibility, the shear reinforcement member 20 can be curved, and even when the construction space is limited, the shear reinforcement member 20 can be inserted into the reinforcement member insertion hole 2. It becomes easy.

Since the auxiliary device 10 is composed of a flexible member, it can be easily installed in the reinforcing member insertion hole 2.
Moreover, since the slit 13 is formed in the auxiliary device 10, the outer diameter of the auxiliary device 10 can be reduced, and as a result, the insertion into the reinforcing member insertion hole 2 is facilitated. Furthermore, by using the slit 13, the auxiliary device 10 can be easily removed from the reinforcing member insertion hole 2 into which the shear reinforcing member 20 is inserted.

In addition, as shown to (a) of FIG. 5, it is desirable for the shear reinforcement member 20 to be provided with the protrusion member 24 on the outer surface of the wire 21.
When this shear reinforcement member 20 is used, the projecting member 24 is inserted in a state of being in contact with the inner wall surface of the reinforcement member insertion hole 2 in the arrangement step. Providing the protruding member 24 can prevent the wire 21 from contacting the inner wall surface of the reinforcing member insertion hole 2.

In other words, the shear reinforcement member 20 that is curved when inserted into the reinforcement member insertion hole 2 may remain curved even inside the reinforcement member insertion hole 2 as shown in FIG. If the wire 21 is in contact with the inner wall surface of the reinforcing member insertion hole 2, the bonding performance between the filler 30 and the inner wall surface may be hindered, so the curved wire 21 needs to be repaired.
If the shear reinforcement member 20 includes the protruding member 24, the bending of the wire 21 is corrected by the protruding member 24 only by insertion into the reinforcing member insertion hole 2, so that the workability is excellent. Further, the protruding member 24 improves the adhesion performance with the filler 30.

  The configuration of the protruding member 24 is not limited. For example, as shown in FIG. 5B, a member provided with a crimping portion 24a and a spacer 24b may be used.

  The crimping part 24a is made of a cylindrical member, and is fixed to the wire 21 by applying (caulking) a compressive force in a state where the wire 21 is inserted.

The spacer 24 b is a disk-like member that is integrally fixed to the crimping portion 24 a and has an outer diameter slightly smaller than the inner diameter of the reinforcing member insertion hole 2. In addition, the shape of the spacer 24b is not limited, For example, a cross shape and radial shape may be sufficient.
In FIG. 5A, the protruding members 24 are fixed at two locations, but the number and arrangement of the protruding members 24 are not limited.

  In 2nd Embodiment, as shown to (a) and (b) of FIG. 7, the auxiliary | assistant apparatus 10 was equipped with the main-body part 11 whose outer width becomes small as it goes to the back of the reinforcing member insertion hole 2. It is different from the first embodiment in that a thing is used.

  Although the main body 11 has a cylindrical shape, since the diameter thereof is reduced toward the tip (lower end in FIG. 7B), the auxiliary device 10 can be easily installed in the reinforcing member insertion hole 2. It becomes.

  Since the outer diameter d1 of the base end (upper end in FIG. 7B) of the main body 11 is formed larger than the inner diameter D of the reinforcing member insertion hole 2, the auxiliary device 10 is placed in the reinforcing member insertion hole 2. It can be locked to the hole of the reinforcing member insertion hole 2 simply by inserting.

  A slit (cut) 13 is formed in the main body 11. When the auxiliary device 10 is extracted from the reinforcing member insertion hole 2, the width of the slit 13 is made larger than that of the wire 21 by expanding the main body 11, and the wire 21 is passed through the slit 13.

  Since the effect of the auxiliary device 10 according to the other second embodiment is the same as the contents shown in the first embodiment, detailed description thereof is omitted.

In 3rd Embodiment, as shown to (a) and (b) of FIG. 8, as an auxiliary | assistant apparatus 10, the point which equips the outer surface of the main-body part 11 with the contact plate part 14 is 1st implementation. It is different from the form.
The maximum width of the contact plate portion 14 is larger than the inner diameter of the reinforcing member insertion hole 2. The contact plate portion 14 has a flange shape and is formed integrally with the main body portion 11.

  According to the auxiliary device 10 of the present embodiment, the auxiliary device 10 can be easily installed by allowing the auxiliary device 10 to stand at the wellhead portion of the reinforcing member insertion hole 2 using the contact plate portion 14. .

  A slit (cut) 13 is formed in the main body portion 11 and the contact plate portion 14. When the auxiliary device 10 is extracted from the reinforcing member insertion hole 2, the width of the slit 13 is made larger than that of the wire 21 by expanding the main body 11, and the wire 21 is passed through the slit 13.

Since the operational effects of the auxiliary device 10 according to the other third embodiment are the same as the contents shown in the first embodiment, detailed description thereof is omitted.
In addition, although this embodiment demonstrated the case where the contact plate part 14 was formed in the front-end | tip (FIG. 8 lower end) of the main-body part 11, the formation location of the contact plate part 14 is not limited. For example, it is good also as a structure which inserts a part of main body part 11 in the reinforcement member insertion hole 2 by making the front-end | tip part of the main body part 11 protrude rather than the contact plate part 14. FIG.

  As shown in FIG. 9, the auxiliary device 10 according to the fourth embodiment is the first implementation in that a receiving lid 15 is formed on one end surface (end surface opposite to the main body portion 11) of the guide portion 12. This is different from the auxiliary device 10 of the form.

  According to the auxiliary device 10 of the present embodiment, the filler 30 injected into the reinforcing member insertion hole 2 is received by the receiving lid 15 so that the filler 30 can be prevented from spilling down. Therefore, it becomes possible to perform high-quality construction more easily.

  Since the operational effects of the auxiliary device 10 according to the other fourth embodiment are the same as the contents shown in the first embodiment, detailed description thereof is omitted.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and the above-described constituent elements can be appropriately changed without departing from the spirit of the present invention.

In the embodiment, the case where the shearing reinforcement member is inserted into the reinforcing member insertion hole and then the filler is injected into the reinforcing member insertion hole has been described. However, after a predetermined amount of filler is injected into the reinforcing member insertion hole. A shear reinforcement member may be inserted, and the order of the arrangement step and the filling step is not limited.
Further, after the shear reinforcement member is disposed in the reinforcing member insertion hole into which a predetermined amount of filler has been injected, the filler may be further injected.

  The auxiliary device does not necessarily need to be made of a flexible material.

  The RC structure to which the shear reinforcement method and the auxiliary device of the reinforced concrete structure of the present invention can be applied is not limited, and can be applied to any RC structure such as a road structure in service, a common groove, and a building. Is possible.

DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Reinforcement member insertion hole 10 Auxiliary device 11 Main body part 12 Guide part 13 Slit 14 Catch plate part 15 Receiving lid 20 Shear reinforcement member 21 Wire material 24 Projection member 30 Filler

Claims (6)

A drilling step of drilling a reinforcing member insertion hole in an existing reinforced concrete structure;
An arrangement step of inserting a shear reinforcement member into the reinforcement member insertion hole;
A filling step of injecting a filler into the reinforcing member insertion hole, and a shear reinforcement method for a reinforced concrete structure comprising:
The shear reinforcement member is mainly composed of a flexible wire,
In the hole of the reinforcing member insertion hole, an auxiliary device having a guide portion protruding from the reinforcing member insertion hole is installed,
In the arranging step, the shear reinforcing member is pressed while being pressed against the inner wall surface of the guide portion. The shear reinforcement member includes a protruding member provided on the outer surface of the wire,
The method for shear reinforcement of a reinforced concrete structure according to claim 1, wherein, in the arranging step, the protruding member is brought into contact with an inner wall surface of the reinforcing member insertion hole. An auxiliary device for guiding the shear reinforcement member when inserting the shear reinforcement member into a reinforcement member insertion hole drilled in an existing reinforced concrete,
A main body part, and a half-cylindrical guide part arranged in a state protruding from the reinforcing member insertion hole,
Said body portion, said reinforcing member is inserted into the insertion hole, the auxiliary device you characterized in that the outer width is formed to be smaller in accordance toward the back of the reinforcing member insertion hole. An auxiliary device for guiding the shear reinforcement member when inserting the shear reinforcement member into a reinforcement member insertion hole drilled in an existing reinforced concrete,
A main body part, a half-cylindrical guide part arranged in a state protruding from the reinforcing member insertion hole, and an outer width formed on the outer surface of the main body part larger than the inner diameter of the reinforcing member insertion hole. a caul portions, auxiliary device you comprising: a. An auxiliary device for guiding the shear reinforcement member when inserting the shear reinforcement member into a reinforcement member insertion hole drilled in an existing reinforced concrete,
A main body part, and a half-cylindrical guide part arranged in a state protruding from the reinforcing member insertion hole,
To the main body portion, the auxiliary device characterized in that the slit of the large width is formed than the outer diameter of the wire rod constituting the shear reinforcement member. An auxiliary device for guiding the shear reinforcement member when inserting the shear reinforcement member into a reinforcement member insertion hole drilled in an existing reinforced concrete,
A main body part, and a half-cylindrical guide part arranged in a state protruding from the reinforcing member insertion hole,
The guide unit auxiliary device you characterized in that receiving cap on one end surface is formed of.

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