JP5718652B2 - Reinforcing bar seal structure - Google Patents

Description

  The present invention relates to a seal structure that is attached to an end of a joint when two reinforcing bars are connected in a straight line using a cylindrical joint.

  In order to connect two rebars arranged in a straight line, it is known to fill the joint with a filler such as mortar in a state where the end portions of the rebar are inserted into the tubular joint. When filling the mortar, the gap between the inner periphery of both ends of the joint and the outer periphery of the reinforcing bar is sealed with a sealing member, thereby preventing leakage of the mortar.

  As disclosed in Patent Document 1, the seal member has an annular base and an annular flange extending radially inward from the base. The base member fits into the annular mounting groove on the inner periphery of both ends of the joint, whereby the seal member is mounted on the joint.

  Since the inner diameter (inner peripheral diameter) of the collar is smaller than the outer diameter of the reinforcing bar, when the reinforcing bar is inserted, the inner peripheral edge of the flange and the vicinity thereof are in close contact with the outer periphery of the reinforcing bar in an elastically deformed state. Seal between the bar and the reinforcing bar.

The difference between the inner diameter of the flange of the seal member and the outer diameter of the reinforcing bar is preferably as long as it does not hinder the insertion of the reinforcing bar. This is because the amount of elastic deformation of the heel portion is increased, the adhesion is increased, and the sealing performance is improved.
In particular, when adopting a configuration in which the peripheral surface of the reinforcing bar is pressed by a bolt screwed into the joint as in Patent Document 1, the reinforcing bar shifts in a radial direction from a position coaxial with the joint and the sealing member. The sealing performance between a part of the collar (bolt side portion) and the reinforcing bar is reduced as compared with the coaxial position. In order to compensate for this, it is necessary to increase the difference between the inner diameter of the collar and the outer diameter of the reinforcing bar.

JP 2009-150049 A

  However, if the difference between the inner diameter of the collar part of the seal member and the outer diameter of the reinforcing bar is large, the collar part closely adheres to the outer periphery of the reinforcing bar, and therefore, in the process of inserting the two reinforcing bars into the joint, Friction increases and a large axial force acts on the seal member. As a result, there is a risk that the seal member may fall out of the fitting groove of the joint.

  The present invention has been made to solve the above-described problems, and seals between the inner periphery of the end of the tubular joint for connecting reinforcing bars and the outer periphery of the reinforcing bars, and leakage of the filler filled in the joint. The seal structure includes an annular seal member made of an elastic material and a C-shaped elastically deformable retaining ring, and at least a part of the seal member is formed in an annular mounting groove on the inner periphery of the end of the joint. An annular base portion to be fitted and an annular flange portion extending radially inward from the base portion, and the holding ring is housed in the base portion of the seal member and is located on the inner side of the outer peripheral portion of the base portion Has been placed.

  According to the above configuration, the state in which the base of the seal member is fitted in the fitting groove at the end of the joint can be maintained by the retaining ring, so that even if a large axial force acts on the seal member, Can be prevented. For this reason, the inner diameter of the collar portion can be made sufficiently smaller than the outer diameter of the reinforcing bar, and the gap between the joint and the reinforcing bar can be well sealed. In addition, since the retaining ring has a C shape, the diameter can be reduced with elastic deformation by applying a force in the radial direction to the sealing member incorporating the retaining ring, and the sealing member can be fitted with a fitting groove in the joint. Can be easily installed.

Preferably, the base portion of the seal member has an annular receiving recess that is open on the inner side in the radial direction, and the holding ring is received in the receiving recess.
According to this configuration, even if the seal member and the holding ring are separate parts, the holding ring can be easily and reliably attached to the seal member.

Preferably, at least a part of the holding ring is accommodated in the mounting groove via the base.
According to this configuration, when an axial force is applied to the seal member when the reinforcing bar is inserted, the retaining ring is caught in the mounting groove, so that the seal member can be more reliably prevented from falling off.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to implement | achieve the favorable sealing performance between a coupling and a reinforcing bar, the drop-off of the sealing member from a coupling can be prevented.

(A) is a longitudinal cross-sectional view of the reinforcing bar connecting device incorporating the seal structure according to the first embodiment of the present invention, and (B) is a vertical cross-sectional view of a cylindrical joint of the reinforcing bar connecting device. It is a cross-sectional view of the seal structure along the surface orthogonal to the joint axis. It is a longitudinal cross-sectional view which expands and shows the principal part of the seal structure of FIG. (A), (B), (C) is a figure corresponding to FIG. 3 which shows other embodiment of this invention, respectively.

  Hereinafter, the reinforcing bar connecting device 1 constituting the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the connecting device 1 is for connecting two deformed reinforcing bars 2 and 3 arranged in a straight line at a construction site. These deformed reinforcing bars 2 and 3 may be screw reinforcing bars having screw nodes as shown in the figure, or normal deformed reinforcing bars having longitudinal ribs extending in the axial direction and transverse ribs formed at a predetermined pitch.

As shown in FIG. 1, the connecting device 1 includes a cylindrical joint 5 made of a metal casting. An annular mounting groove 5 a is formed on the inner periphery of both ends of the joint 5.
Further, at both ends of the joint 5, an inlet 5b and a discharge port 5c are formed adjacent to the pair of mounting grooves 5a and penetrating the peripheral wall of the joint 5 at positions inside the mounting grooves 5a. .

A screw hole 5d penetrating the peripheral wall of the joint 5 is formed between the center of the axial length of the joint 5 and the inlet 5b and between the center and the outlet 5c.
The inlet 5b, the outlet 5c, and the screw hole 5d are arranged on a straight line parallel to the axis L of the joint 5.

  In the inner periphery of the joint 5, a plurality of support ribs 5 e extending in the circumferential direction over an angular range of approximately 180 ° are provided in a region facing the position where the screw hole 5 d is formed (a region on the opposite side across the axis L). , Are formed at intervals in the axial direction. A plurality of auxiliary ribs 5f extending in the circumferential direction over an angle range of approximately 180 ° are formed at intervals in the axial direction in a region including the position where the screw hole 5d is formed.

  Prior to the connection of the reinforcing bars 2 and 3, the mounting structure 5 according to the present invention is mounted in the mounting grooves 5a at both ends of the joint 5, and a bolt 7 is shallowly screwed into the screw hole 5d and is inserted into the inlet 5b. Is fitted with a rubber check valve (not shown). In addition, you may mount | wear with the volt | bolt 7 and a non-return valve after the reinforcement insertion mentioned later.

  The operation of the rebar connecting device 1 having the above configuration will be briefly described. As described above, the joint 5 fitted with the seal structure 6, the bolt 7, and the check valve is inserted in advance into the end of one of the reinforcing bars 2, and the other reinforcing bar 3 is brought close to the reinforcing bar 2. After arranging on a straight line, the joint 5 is shifted along the other reinforcing bar 3. As a result, the ends of the two reinforcing bars 2 and 3 are inserted into about half of the total length of the joint 5.

Next, the two bolts 7 are screwed in, and as shown in FIG. 1, the reinforcing bars 2 and 3 are pressed against the support rib 5e at their tips. In this way, the two reinforcing bars 2 and 3 are temporarily fixed to the joint 5.
In the above temporarily fixed state, the seal structure 6 seals between the outer periphery of the reinforcing bars 2 and 3 and the inner periphery of the end of the joint 5.

Next, the mortar 8 (grouting material, filler) is filled in the joint 5. When the reinforcing bars 2 and 3 are horizontal, the injection port 5b, the discharge port 5c, and the bolt 7 are positioned above the shaft core L of the joint 5, and an injection nozzle (not shown) is a non-return of the injection port 5b. In this state, the injection of the mortar 8 is started.
At this time, the joint 5 and the reinforcing bars 2 and 3 are sealed by the seal structures 6 disposed at both ends of the joint 5, and leakage of the mortar 8 from between the two is prevented.

  The injection | pouring operation | work of the said mortar 8 is complete | finished by confirming discharge | emission of the mortar 8 from the discharge port 5c. The reinforcing bars 2 and 3 are connected through the mortar 8 and the joint 5 by the hardening of the mortar 8.

Next, the seal structure 6 and the vicinity thereof that characterize the present invention will be described in detail with reference to FIGS.
The mounting grooves 5a formed at both ends of the joint 5 have a main groove portion 5x having a substantially rectangular cross section, and a tapered portion 5y whose diameter decreases from the main groove portion 5x toward the end face of the joint 5. ing.

Each seal structure 6 includes an annular seal member 10 made of rubber (elastic material) and an elastically deformable C-shaped holding ring 20 made of steel (metal) wire or the like. Of course, the retaining ring 20 has a much higher spring constant than the sealing member 10.
The seal member 10 has an annular base portion 11 that fits in the mounting groove 5a, and a pair of annular flange portions 12 and 13 that are integrated with the base portion 11 and extend radially inward from the inner periphery thereof.

  As shown in FIG. 3, the base portion 11 has an outer surface shape corresponding to the mounting groove 5 a of the joint 5, and the outer peripheral portion 11 a and both side wall portions that are connected to both side edges and are substantially orthogonal to the shaft core L. 11b, 11c, and a tapered portion 11d whose diameter decreases from the side wall portion 11c closer to the end surface of the joint 5 toward the end surface. The angle of the taper portion 11d with respect to the axis L is equal to or greater than the taper portion 5y of the mounting groove 5a.

  The base 11 has an annular housing recess 11e formed by the outer peripheral portion 11a and both side wall portions 11b and 11c. The housing recess 11e is open on the inside in the radial direction.

The one flange portion 12 is connected to one side wall portion 11 b of the base portion 11. The other side wall 11b of the base portion 11 is connected to the other flange portion 13 through a tapered portion 11d.
The flanges 12 and 13 have a flat membrane shape orthogonal to the axis L, and the inner peripheral edges 12a and 13a of the flanges 12 and 13 are concentric with the base 11, and the reinforcing bars 2 and 3 are inserted. Insertion ports 12x and 13x are defined respectively. The diameters of these insertion ports 12x and 13x (inner diameters of the flange portions 12 and 13) are smaller than the outer diameters of the reinforcing bars 2 and 3.
In the present embodiment, the inner diameter of the flange 13 is smaller than the inner flange 12, but both may be equal or vice versa.

The holding ring 20 has a C shape extending over an angle range of 180 ° or more, and both ends 20a thereof are spaced apart in the circumferential direction.
The holding ring 20 is housed in the housing recess 11e of the base 11 of the seal member 10, and is disposed inside the outer peripheral portion 11a. In this embodiment, the holding ring 20 is in a substantially natural state in this accommodated state, and is in contact with the outer peripheral portion 11a and both side walls 11b and 11c of the base portion 11 (both side surfaces of the accommodating recess 11e).

  The sealing member 10 incorporating the retaining ring 20 is inserted through the end opening of the joint 5 in a state where the diameter is reduced by applying a force inward in the radial direction to be elastically deformed. Then, at the position where the base portion 11 of the seal member 10 corresponds to the receiving groove 5 a of the joint 5, the radial inward force is released. Then, the holding ring 20 is elastically restored to return to the natural state, and accordingly, the base portion 11 of the seal member 10 is fitted into the mounting groove 5a. In the present embodiment, the holding ring 20 is located in the main groove portion 5x of the mounting groove 5a via the thin base portion 11 of the seal member 10.

  As described above, the ends of the reinforcing bars 2 and 3 are inserted into the joint 5 in a state where the seal structure 6 is attached to both ends of the joint 5. In this insertion step, the flange portion of the seal member 10 is inserted. The inner peripheries 12a and 13a of 12 and 13 and the vicinity thereof move relative to each other in the axial direction on the outer circumferences of the reinforcing bars 2 and 3 while being in close contact with the outer circumferences of the deformed reinforcing bars 2 and 3 with elastic deformation. At that time, axial force acts on the seal member 10 due to friction between the two, but the retaining ring 20 suppresses deformation of the outer peripheral portion 11a of the base portion 11 of the seal member 10 located on the radially outer side. Therefore, it is possible to prevent the base portion 11 from coming off from the mounting groove 5a of the joint 5, and thus, it is possible to prevent the seal member 10 from falling off the joint 5.

  Since the retaining member 20 can prevent the seal member 10 from falling off as described above, the inner diameters of the flange portions 12 and 13 of the seal member 10 are taken into consideration to prevent the seal member 10 from falling off due to friction when the reinforcing bars 2 and 3 are inserted. You can decide without. Therefore, it can be made sufficiently smaller than the outer diameter of the reinforcing bars 2 and 3. For this reason, the inner peripheral edges 12a, 13a of the flanges 12, 13 can be strongly adhered to the outer periphery of the reinforcing bars 2, 3 in a state where the inner peripheral edges 12a, 13a are largely elastically deformed. it can.

  Further, as described above, when the bolts 7 are screwed after the reinforcing bars 2 and 3 are inserted into the joint 5, the reinforcing bars 2 and 3 are biased toward the support rib 5 e side from the shaft center of the joint 5. Since the inner diameters 12 and 13 are sufficiently smaller than the outer diameters of the reinforcing bars 2 and 3, the bolts 7 can be in close contact with each other without a gap. As a result, it is possible to reliably prevent the mortar 8 from leaking out when the mortar 8 is injected.

  In addition, when there are a plurality of flanges 12 and 13 as in the present embodiment, at least one of them should be in close contact with the reinforcing bars 2 and 3 over the entire circumference.

  Next, another embodiment of the present invention will be described with reference to FIGS. In these embodiments, components corresponding to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, the entire seal member 10 is formed thinly across the base 11 and the flanges 12 and 13, but in the second embodiment shown in FIG. 4A, the base 11A of the seal member 10A is thick. ing. The base portion 11A has the same outer surface shape as the base portion 11 of the first embodiment, but the inner surface shape is different. The retaining ring 20A of this embodiment has a smaller diameter than the retaining ring 20 of the first embodiment and is radially inward from the main groove portion 5x, but a part of the retaining ring 20A is disposed in the mounting groove 5a.

  The third embodiment shown in FIG. 4B is different from the second embodiment only in having a single collar 13.

  In the fourth embodiment shown in FIG. 4C, the holding ring 20B is embedded in the base portion 11B of the seal member 10B by means such as insert molding. The part located in the radial direction outer side of the holding ring 20B in the base part 11B is provided as the outer peripheral part 11a.

The present invention is not limited to the above embodiment, and various forms can be adopted. For example, the retaining ring may be made of a highly rigid resin.
You may apply this invention only to the seal structure with which one edge part is mounted | worn among the both ends of a coupling.
The present invention can also be applied to the case where one of the reinforcing bars and the joint is screwed and the other reinforcing bar and the joint are connected via a mortar.
There may be three or more buttocks of the seal member.

  The present invention can be applied to a seal structure of an apparatus for connecting reinforcing bars using mortar or the like.

DESCRIPTION OF SYMBOLS 1 Connection apparatus 2, 3 Rebar 5 Joint 5a Mounting groove 6 Seal structure 10, 10A, 10B Seal member 11, 11A, 11B Base part 11a Outer peripheral part 11e Housing recessed part 12, 13 Gutter part 20, 20A, 20B Holding ring

Claims (3)

In a seal structure that seals between the inner periphery of the end of the tubular joint for connecting reinforcing bars and the outer periphery of the reinforcing bars, and prohibits leakage of the filler filled in the joint,
An annular seal member made of an elastic material, and a C-shaped elastically deformable retaining ring;
The seal member has an annular base portion that is at least partially fitted into an annular mounting groove on the inner periphery of the end portion of the joint, and an annular flange portion that extends radially inward from the base portion,
The holding ring is housed in the base portion of the seal member, and is disposed on the inner side of the outer peripheral portion of the base portion .
The seal structure according to claim 1, wherein the base of the seal member has an annular housing recess whose inner side in the radial direction is open, and the holding ring is housed in the housing recess .   The seal structure according to claim 1, wherein at least a part of the retaining ring is accommodated in the mounting groove via the base. In a seal structure that seals between the inner periphery of the end of the tubular joint for connecting reinforcing bars and the outer periphery of the reinforcing bars, and prohibits leakage of the filler filled in the joint,
An annular seal member made of an elastic material, and a C-shaped elastically deformable retaining ring;
The seal member has an annular base portion that is at least partially fitted into an annular mounting groove on the inner periphery of the end portion of the joint, and an annular flange portion that extends radially inward from the base portion,
The holding ring is housed in the base portion of the seal member, and is disposed on the inner side of the outer peripheral portion of the base portion .
At least a part of the holding ring is accommodated in the mounting groove via the base portion .

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