JP5704903B2 - Rebar connecting seal member - Google Patents

Description

  The present invention relates to a seal member provided at an end of a sleeve joint that connects two reinforcing bars in a straight line.

  A connection structure in which two reinforcing bars are arranged in a straight line and connected by a sleeve joint is known (see Patent Document 1). One of the two reinforcing bars is inserted into one end of the sleeve joint. The other reinforcing bar is inserted into the other end of the sleeve joint. Seal members are mounted inside both ends of the sleeve joint. The seal member has an annular shape and seals between the inner periphery of the sleeve joint and the outer periphery of the reinforcing bar. Fill the inside of the sleeve joint with grouting agent such as mortar. At this time, the grout agent can be prevented from leaking by the seal member. By hardening the grout agent, the two reinforcing bars are connected via the grout agent and the sleeve joint.

  The sleeve joint of Patent Document 1 is provided with a screw hole so as to penetrate the peripheral wall. A protrusion is provided on the inner wall of the sleeve joint opposite to the screw hole. A bolt is screwed into the screw hole, and the reinforcing bar in the sleeve joint is pressed against the protrusion with the bolt. Thus, the sleeve joint and the reinforcing bars can be temporarily fixed until the grout agent is filled.

JP 2009-150049 A

  This type of sleeve joint is prepared in a size corresponding to the diameter of the reinforcing bar. However, there is a case where a reinforcing bar having a diameter different from the size of the sleeve joint is joined. For example, when connecting two reinforcing bars having different sizes, if the size of the sleeve joint is matched to the large diameter reinforcing bar, the sleeve joint is too large for the small diameter reinforcing bar. When these two large and small reinforcing bars are temporarily fixed to the sleeve joint with the temporary fixing bolt, the small diameter reinforcing bars are pushed by the bolt and eccentric. When the reinforcing bar is eccentric, a gap is formed between the portion opposite to the eccentric side of the reinforcing bar and the seal member, and the grout agent may leak from this gap. In Patent Document 1, a second seal member is further nested inside the seal member, and when the reinforcing bar is eccentric, the second seal member is eccentric and the sealing performance is secured. However, the number of parts and man-hours for nesting increase.

The present invention has been made to solve the above-described problems, and is an annular seal provided between the inner periphery of the end portion of the rebar connecting sleeve joint and the outer periphery of the rebar inserted into the sleeve joint. A member,
A membrane portion having a hole through which the reinforcing bar passes is integrally provided with an annular peripheral wall portion provided on the outer periphery of the membrane portion and fixed to the sleeve joint, and the membrane portion is bent in a stepped shape or a hook shape. It is characterized not claimed to include cyclic or flexible membrane portion of the annular surrounding the hole along and the peripheral wall portion becomes to.
Further, the present invention is an annular seal member provided between the inner periphery of the axial end of the reinforcing bar connecting sleeve joint and the outer periphery of the reinforcing bar inserted into the reinforcing bar connecting sleeve joint,
The membrane portion is integrally provided with an annular peripheral wall portion provided on the outer periphery of the membrane portion and fixed to the sleeve joint, and the membrane portion is formed in a disk shape having a hole through which the reinforcing bar passes in the center. A flat membrane portion that is arranged to protrude outward in the axial direction from the peripheral wall portion, and a flexible membrane portion that includes an annular step portion between the outer peripheral portion of the flat membrane portion and the peripheral wall portion, Due to the eccentricity of the reinforcing bar with respect to the reinforcing bar connecting sleeve joint, the part of the flexible film part opposite to the eccentric side is bent and deformed so as to incline in the radial direction toward the flat film part. Features.

  Here, when the flexible membrane portion has a stepped shape, the portion of the seal member on the peripheral wall portion side from the flexible membrane portion and the portion on the hole side of the flexible membrane portion are displaced in the axial direction of the seal member. . The peripheral wall portion side portion and the hole side portion are connected via the step-shaped flexible membrane portion. The flange-shaped flexible membrane portion has a radially outer flange portion and a radially inner flange portion, and these flange portions are continuous so as to be folded back in the axial direction of the seal member. Each ridge portion corresponds to the step-shaped flexible membrane portion. The flexible membrane portion has a protruding amount or a recessed amount having an appropriate size in the axial direction of the seal member.

  According to this sealing member, when the reinforcing bar is eccentric and tensile stress is applied to the portion of the membrane portion opposite to the eccentric side, the portion of the flexible membrane portion opposite to the eccentric side A moment inward in the radial direction works. This moment causes the flexible membrane portion to bend. That is, when the flexible film portion has a stepped shape, it is bent and deformed so as to be inclined inward in the radial direction. When the flexible membrane portion is bowl-shaped, it is bent and deformed so that the angle formed between the radially outer ridge portion and the radially inner ridge portion is expanded. By making the amount of protrusion or depression in the axial direction of the flexible membrane portion appropriate, the amount of flexure deformation of the flexible membrane portion can be increased even if the tensile force is small. Thereby, it can be in contact with the reinforcing bar even on the side opposite to the eccentric side of the film part, and the sealing performance between the sleeve joint and the reinforcing bar can be ensured. Moreover, it is not necessary to nest the second seal member of the above-mentioned Patent Document 1, and it is possible to avoid an increase in the number of parts and man-hours.

  It is preferable that the flexible film portion is provided on the outer peripheral portion of the film portion and is continuous with the peripheral wall portion. The peripheral wall portion has a higher shape retention strength than the membrane portion and thus the flexible membrane portion. Therefore, the flexible film portion can be reliably bent and deformed.

  It is preferable that the thickness of the flexible membrane portion is equal to or less than the thickness of the membrane portion on the radially inner side or the outer side of the flexible membrane portion. Thereby, the flexible film portion can be reliably bent and deformed.

  A plurality of the flexible membrane portions may be provided concentrically. The plurality of flexible film portions may be continuous in a bellows shape as a whole. Thereby, even if the amount of flexure of each flexible membrane portion is small, the amount of deformation of the entire membrane portion can be increased. A plurality of step-like flexible film portions may be provided concentrically. A plurality of bowl-shaped flexible membrane portions may be provided concentrically.

  It is preferable that a rim portion thicker than a portion radially outside the inner peripheral edge of the film portion is provided on the inner peripheral edge of the hole of the film portion. The inner diameter of the rim portion when the seal member is in a natural state (non-deformed) is set smaller than the inner diameter of the reinforcing bar. Therefore, contraction force acts on the rim portion by insertion of the reinforcing bar. As a result, the rim portion can be brought into close contact with the outer periphery of the reinforcing bar, and the tensile force can be surely expressed in the portion of the membrane portion opposite to the eccentric side, and the flexible membrane portion can be reliably secured. It can be bent and deformed.

  According to the present invention, even if the reinforcing bar is eccentric, the sealing performance between the sleeve joint and the reinforcing bar can be ensured. Further, it is possible to avoid an increase in the number of parts and man-hours.

It is sectional drawing of the reinforcing bar connection structure which concerns on 1st Embodiment of this invention. In the said reinforcing bar connection structure, it is sectional drawing of the sealing member which has a step-shaped flexible film part. It is a front view of the said sealing member. It is sectional drawing which shows the connection method of the reinforcing bar in the said 1st Embodiment in the state which mounted | wore the sleeve joint of the connection apparatus with the sealing member. It is sectional drawing which shows the connection method of the reinforcing bar in the said 1st Embodiment in the state which inserts a reinforcing bar in the said sleeve joint. It is sectional drawing which shows the connection method of the reinforcing bar in the said 1st Embodiment in the state which made the said reinforcing bar eccentric with the volt | bolt. It is sectional drawing which expands and shows the peripheral part of the said sealing member of FIG. It is sectional drawing of the sealing member which has the hook-shaped flexible film part which concerns on 2nd Embodiment of this invention. It is a front view of the sealing member which has the said hook-shaped flexible membrane part. In the reinforcing bar connection structure according to the second embodiment, it is a cross-sectional view showing an enlarged peripheral portion of the seal member. It is sectional drawing of the sealing member which has a bowl-shaped flexible film part which concerns on 3rd Embodiment of this invention. It is a front view of the sealing member of the said 3rd Embodiment. In the reinforcing bar connection structure according to the third embodiment, it is a cross-sectional view showing an enlarged peripheral portion of the seal member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a reinforcing bar connecting structure according to a first embodiment of the present invention. In the reinforcing bar connecting structure, the connecting device 1 connects the two reinforcing bars 2 and 3 in a straight line. The reinforcing bars 2 and 3 may be ordinary deformed reinforcing bars having vertical ribs and horizontal flanges, or may be screw reinforcing bars having screw holes. The diameters of the two reinforcing bars 2 and 3 are different from each other. The reinforcing bar 2 has a relatively large diameter, and the reinforcing bar 3 has a relatively small diameter.

  The coupling device 1 includes a sleeve joint 10 and seal members 20 and 30. The sleeve joint 10 is made of a metal casting. The size of the sleeve joint 10 is suitable for the large-diameter rebar 2 of the rebars 2 and 3. For small diameter reinforcing bars 3, the size of the sleeve joint 10 is large.

  On the inner periphery of both end portions of the sleeve joint 10, annular housing grooves 11 are formed respectively. Openings 12 are formed in the peripheral walls near both ends of the sleeve joint 10. A pair of screw holes 14 are formed in a portion on the inner side in the axial direction from each opening 12 of the peripheral wall of the sleeve joint 10. The opening 12 and the screw hole 14 are disposed at the same position in the circumferential direction of the sleeve joint 10 (upper portion in FIG. 1).

  A plurality of support protrusions 15 are formed on the inner periphery of the sleeve joint 10. The plurality of support protrusions 15 are arranged at intervals in the axial direction of the sleeve joint 10. Each support protrusion 15 is disposed on a portion (the lower side in FIG. 1) opposite to the screw hole 14 in the circumferential direction of the sleeve joint 10. Each support protrusion 15 extends in the circumferential direction over an angular range of approximately 180 ° on the inner periphery of the sleeve joint 10 around a position on the opposite side of the screw hole 14 at 180 °.

  In FIG. 1, the end portion of the large-diameter rebar 2 is inserted in, for example, the right side portion in the sleeve joint 10. The end of the small-diameter rebar 3 is inserted into the sleeve joint 10, for example, on the left side. A sleeve joint 10 straddles between the ends of the reinforcing bars 2 and 3.

Bolts 4 are screwed into the respective screw holes 14. The bolt 4 on the right side presses the large-diameter rebar 2 against the support protrusion 15. Axis L ₂ of the reinforcing bar 2 is shifted to the side opposite to the bolt 4 from the axis L ₁₀ of the sleeve joint 10. The bolt 4 on the left side presses the small-diameter rebar 3 against the support protrusion 15. Axis L ₃ rebar 3 is shifted to the side opposite to the bolt 4 from the axis L ₁₀ of the sleeve joint 10. The eccentric amount D 3 of the small-diameter reinforcing bar ₃ is larger than the eccentric amount D ₂ of the large-diameter reinforcing bar ₂ .

  The grout agent 5 is filled in the sleeve joint 10. Two reinforcing bars 2 and 3 are connected via a grout agent 5 and a sleeve joint 10.

  Seal members 20 and 30 are attached to both ends of the sleeve joint 10. The sealing members 20 and 30 are for preventing leakage of the grout agent 5 before curing, and the sealing member 20 is provided between the inner periphery of the right end portion of the sleeve joint 10 and the outer periphery of the large-diameter rebar 2. To seal. The seal member 30 seals between the inner periphery of the left end portion of the sleeve joint 10 and the outer periphery of the small-diameter rebar 2.

  The seal member 20 for the large-diameter rebar 2 is made of rubber (elastic material) and has an annular shape. As shown in FIG. 4, the seal member 20 is integrally provided with two film portions 21 and 22 and a peripheral wall portion 23 provided on the outer periphery of the film portions 21 and 22. The peripheral wall portion 23 has a thick annular shape. The peripheral wall portion 23 has a larger shape retention strength than the film portions 21 and 22 and is not easily elastically deformed.

  The two film portions 21 and 22 are provided side by side in the axial direction of the seal member 20. The film portion 21 is disposed at the outer end portion of the seal member 20 in the axial direction. The film part 21 has a thin disk shape having a hole 21a in the center. The film part 21 in a natural state (when not deformed) is flat. The outer peripheral portion of the film portion 21 is integrally connected to the outer end portion in the axial direction of the peripheral wall portion 23.

  The film part 22 is disposed in the intermediate part of the seal member 20 in the axial direction. The film part 22 has a thin disk shape having a hole 22a in the center. The film portion 22 in a natural state (when not deformed) is flat. The outer peripheral portion of the film portion 22 is integrally connected to the intermediate portion in the axial direction of the peripheral wall portion 23.

  These film parts 21 and 22 are more easily elastically deformed than the peripheral wall part 23. The diameters of the holes 21a and 22a of the two film portions 21 and 22 are equal, but may be different from each other. The diameters of the holes 21a and 22a are smaller than the diameter excluding the ribs and the fuzz of the reinforcing bar 2.

  As shown in FIG. 1, the peripheral wall portion 23 of the seal member 20 is fitted into the accommodation groove 11 at the right end of the sleeve joint 10, for example. Thus, the peripheral wall portion 23 is fixed to the sleeve joint 10. The reinforcing bar 2 is passed through the holes 21a and 22a of the membrane parts 21 and 22. Due to the eccentricity of the rebar 2, the eccentric part (the lower side in FIG. 1) of the film parts 21 and 22 is greatly elastically deformed. The portions on the opposite side (upper side in FIG. 1) of the membrane portions 21 and 22 are relatively small and elastically deformed. The peripheral portions of the holes 21a and 22a of the films 21 and 22 are in contact with the reinforcing bar 2 over the entire circumference.

  As shown in FIGS. 2 and 3, the seal member 30 for the small-diameter rebar 3 is made of rubber (elastic material) and has an annular shape. As shown in FIG. 2, the seal member 30 is integrally provided with two film portions 31 and 32 and a peripheral wall portion 33 provided on the outer periphery of the film portions 31 and 32. The peripheral wall 33 has a thick annular shape. The peripheral wall portion 33 has a larger shape retaining strength than the film portions 31 and 32 and is not easily elastically deformed.

  The two film portions 31 and 32 are provided side by side in the axial direction of the seal member 30. The film portion 31 is disposed at the outer end portion of the seal member 30 in the axial direction. The film part 32 is disposed at an intermediate part in the axial direction of the seal member 30.

  As shown in FIGS. 2 and 3, the membrane portion 31 is integrally formed with a flat membrane portion 34 and a flexible membrane portion 36 provided on the outer peripheral portion of the flat membrane portion 34. The film part 31 is more easily elastically deformed than the peripheral wall part 33. The flat membrane portion 34 has a thin disk shape having a hole 31a in the center, and is flat in a natural state (when not deformed).

  The diameter of the hole 31a in the natural state (when not deformed) is smaller than the diameter excluding the ribs and fuzz of the reinforcing bar 3. As shown in FIG. 3, the part of the inner periphery of the hole 31a opposite to the eccentric side (upper side in FIG. 3) in the natural state (when not deformed) is the rebar 3 in the eccentric state (two points in FIG. 3). It is located on the outer side in the radial direction from the outer peripheral surface of the chain line. In addition, the said site | part on the opposite side of the hole 31 in a natural state (at the time of non-deformation) may be located inside radial direction rather than the outer peripheral surface of the reinforcing bar 3 in an eccentric state.

  As shown in FIGS. 2 and 3, a rim portion 35 is provided on the inner peripheral edge of the hole 31 a of the flat membrane portion 34. The rim portion 35 is thicker than the flat membrane portion 34 (the portion radially outside the inner periphery of the hole 31 a in the membrane portion 31), and is less likely to be elastically deformed than the flat membrane portion 34. As shown in FIG. 2, the rim portion 35 protrudes toward the membrane portion 32 (inside in the axial direction, right side in FIG. 2), but protrudes toward the opposite side (outside in the axial direction) from the membrane portion 32. May be.

  As shown in FIG. 2, the flat membrane portion 34 is disposed so as to protrude outward from the peripheral wall portion 33 in the axial direction of the seal member 30 (left side in FIG. 2). A stepped portion between the outer peripheral portion of the flat membrane portion 34 and the peripheral wall portion 33 constitutes a flexible membrane portion 36. A flexible membrane portion 36 is formed by bending the outer peripheral portion of the membrane portion 31 into an L shape (stepped shape). The flexible membrane portion 36 is continuous with the peripheral wall portion 33.

  As shown in FIGS. 2 and 3, the flexible membrane portion 36 has a cylindrical shape (annular shape) having a short axial length with respect to the diameter and along the peripheral wall portion 33. The flexible membrane portion 36 in the natural state (when not deformed) is substantially orthogonal to the flat membrane portion 34 and is concentric with the peripheral wall portion 33 and the rim portion 35. The thickness of the flexible membrane portion 36 is preferably equal to or less than the thickness of the flat membrane portion 34. The thickness of the flat membrane portion 34 is preferably about 0.5 mm to 2 mm. The thickness of the flexible membrane portion 36 is preferably about 0.3 mm to 1.5 mm. The axial length of the flexible membrane portion 36, that is, the height H of the step, is preferably about H = 3 mm to 8 mm.

  The film part 32 has a thin disk shape having a hole 32a in the center, and is flat in a natural state (when not deformed). The diameter of the hole 32a in the natural state (when not deformed) is equal to the diameter of the hole 31a, but may be smaller than at least the diameter excluding the ribs and fuzz of the reinforcing bar 3, and may be larger or smaller than the diameter of the hole 31a. . The outer peripheral portion of the film portion 32 is integrally connected to the intermediate portion in the axial direction of the peripheral wall portion 33. The film part 32 is richer in elasticity than the peripheral wall part 33. The thickness of the film part 32 is equal to the thickness of the flat film part 34, but may be larger or smaller.

  As shown in FIG. 1, the peripheral wall portion 33 of the seal member 30 is fitted in the accommodation groove 11 at the left end of the sleeve joint 10, for example. Thus, the peripheral wall portion 33 is fixed to the sleeve joint 10. The reinforcing bars 3 are passed through the holes 31a, 32a of the film portions 31, 32. Due to the eccentricity of the reinforcing bar 3, the eccentric part (the lower side in FIG. 1) of the flat membrane part 34 and the film part 32 is greatly elastically deformed and is in contact with the reinforcing bar 3. The flat membrane portion 34 of the membrane portion 31 and the portion of the membrane portion 32 opposite to the eccentric side (upper side in FIG. 1) are relatively small and elastically deformed.

  The portion of the flexible membrane portion 36 on the side opposite to the eccentric side (upper side in FIG. 1) is bent and deformed so as to incline radially inward toward the flat membrane portion 34 side (left side in FIG. 1). Yes. With the deformation of the flexible membrane portion 36, the flat membrane portion 34 is displaced inward in the radial direction.

  The rim portion 35 is expanded in diameter by the reinforcing bar 3. Therefore, a strong contractive force acts on the rim portion 35. The entire circumference of the rim portion 35 is in contact with the reinforcing bar 3.

A method of connecting the two reinforcing bars 2 and 3 by the connecting device 1 configured as described above will be described.
As shown in FIG. 4, the seal member 20 is attached to, for example, the right end portion of the sleeve joint 10, and the seal member 30 is attached to, for example, the left end portion of the sleeve joint 10.

  Next, as shown in FIG. 5, the end portion of the reinforcing bar 2 is inserted into the holes 21 a and 22 a of the membrane portions 21 and 22 and inserted into the right end portion of the sleeve joint 10. As a result, the membrane portions 21 and 22 are elastically deformed so that the diameters of the holes 21a and 22a are increased. In addition, in a state where the reinforcing bar 3 is arranged in a straight line with respect to the reinforcing bar 2, the end of the reinforcing bar 3 is inserted into the holes 31 a and 32 a of the membrane portions 31 and 32 and inserted into the left end of the sleeve joint 10. As a result, the film portions 31 and 32 are elastically deformed so that the holes 31a and 32a are expanded in diameter.

  Next, as shown in FIG. 6, the bolts 4 are screwed into the respective screw holes 14, the reinforcing bars 2 and 3 are pressed against the support protrusions 15, and the sleeve joint 20 is temporarily fixed to the reinforcing bars 2 and 3. Thereby, the reinforcing bars 2 and 3 are eccentric with respect to the sleeve joint 10. Due to the eccentricity of the large-diameter rebar 2, the part on the eccentric side (supporting projection 15 side) of the film parts 21, 22 of the seal member 20 is further deformed and is securely adhered to the reinforcing bar 2. Although the amount of deformation of the portion of the membrane portions 21 and 22 opposite to the eccentric side (bolt 4 side) is smaller than that before the eccentricity, the state of being in close contact with the reinforcing bar 2 is sufficiently maintained.

  Due to the eccentricity of the small-diameter rebar 3, the portions on the eccentric side of the film portions 31, 32 of the seal member 30 are further compressed and deformed to be securely adhered to the reinforcing bar 3. In the part of the film part 31 opposite to the eccentric side, the compressive stress is small, and tensile stress acts depending on the location. As a result, the flexible film portion 37 is deformed following the eccentricity of the reinforcing bar 3.

  That is, a moment inward in the radial direction acts on the portion of the flexible membrane portion 36 opposite to the eccentric side by the tensile stress. As shown in FIG. 7, due to this moment, the portion of the flexible membrane portion 36 opposite to the eccentric side is deformed so as to bend radially inward. Therefore, the part on the opposite side to the eccentric side of the film part 31 extends in the eccentric direction as a whole. Thereby, the film part 31 can be in contact with the reinforcing bar also on the side opposite to the eccentric side.

The peripheral wall portion 33 outside the flexible membrane portion 36 has a large shape retaining strength and hardly deforms, so that the moment can be surely expressed. In addition, the tensile stress and thus the moment can be expressed more reliably by the contraction force of the rim portion 35. Thereby, the flexible film part 36 can be deformed so as to bend radially inwardly. Furthermore, by making the length H in the axial direction of the flexible membrane portion 36 appropriate, even if the tensile stress is small, the amount of deformation of the flexible membrane portion 36 can be increased. Therefore, the part on the opposite side to the eccentric side of the film part 31 can be surely in contact with the reinforcing bar 3.
A gap 32e may be formed between the portion of the film portion 32 opposite to the eccentric side and the reinforcing bar 3.

  Next, the grout agent 5 is injected into the sleeve joint 10 from one opening 12. At this time, the grouting agent 5 can be prevented from leaking from both ends of the sleeve joint 10 by the seal members 20 and 30. In particular, even if the small-diameter reinforcing bar 3 is relatively largely eccentric, it is possible to reliably prevent the grout agent 5 from leaking between the reinforcing bar 3 and the part opposite to the eccentric side of the seal member 30. Even if the grout agent 5 enters the space between the film portions 31 and 32 through the gap 32e, the film portion 31 can reliably prevent the grout agent 5 from leaking out.

  When the grout agent 5 is filled in the space between the inner periphery of the sleeve joint 10 and the reinforcing bars 2 and 3, the grout agent 5 leaks from the other opening 12. Waiting for this leakage, the injection of the grout agent 5 is terminated. When the grout agent 5 is cured, the reinforcing bars 2 and 3 are connected via the grout agent 5 and the sleeve joint 10.

  Since the seal member 30 can seal between the sleeve joint 10 and the reinforcing bar 3 alone, the number of parts and the number of man-hours can be reduced as compared with Patent Document 1.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are attached to the drawings for the same parts as those already described, and the description thereof is omitted.
8 to 10 show a second embodiment of the present invention. The second embodiment relates to a modification of the seal member for the small-diameter rebar 3. As shown in FIGS. 8 and 9, the membrane portion 31 of the seal member 30 </ b> A is almost entirely bent into a bowl shape, and constitutes a plurality of bowl-shaped flexible membrane portions 37.

  As shown in FIG. 8, each flexible membrane portion 37 has a radially outer flange portion 37a and a radially inner flange portion 37b. The flange portion 37a is inclined inward in the radial direction toward the inner side in the axial direction. The flange portion 37b is inclined inward in the radial direction toward the outer side in the axial direction. These flange portions 37a and 37b are continuous so as to be folded back in the axial direction of the seal member 30A. The cross section of each flexible membrane portion 37 is a square shape.

  As shown in FIG. 9, in the front view, each flexible membrane portion 37 has an annular shape or a circular shape surrounding the hole 31a along the peripheral wall portion 33. A plurality of flexible membrane portions 37 are arranged concentrically. The flexible membrane portions 37 adjacent in the radial direction are directly connected to each other. That is, the flange portion 37b of each flexible membrane portion 37 is continuous with the flange portion 37a of the flexible membrane portion 37 adjacent to the radially inner side. As a whole of the film part 31, the flange portions 37a and 37b are alternately continued in the radial direction. As a result, the plurality of flexible film portions 37 as a whole have a bellows shape. The outermost flexible membrane portion 37 is integrally connected to the peripheral wall portion 33. The innermost flexible membrane portion 37 is integrally connected to the thick rib 35.

  In 2nd Embodiment, the film | membrane part 32 is provided in the edge part inside the axial direction instead of the intermediate part of the axial direction of 30 A of sealing members. The film part 32 has the same structure as the film part 31. In other words, the membrane portion 32 has a plurality of flexible membrane portions 37 that are bent in a ring shape and a bowl shape surrounding the hole 32a, and these flexible membrane portions 37 are arranged concentrically and have a bellows shape as a whole. Yes.

  As shown by the solid line in FIG. 10, when the reinforcing bar 3 is eccentric with respect to the sleeve joint 10, the flange portions 37a and 37b of each flexible membrane portion 37 on the opposite side to the eccentric side are radially inward (in FIG. The lower side) acts, and the angle formed by these flange portions 37a and 37b is expanded. Therefore, the part on the opposite side to the eccentric side of the film parts 31 and 32 extends radially inward as compared with the natural state shown by the phantom line in FIG. By providing a plurality of flexible film portions 37 concentrically, the expansion amount of the entire film portion 31 or 32 can be increased even if the expansion amount of each flexible film portion 37 is small. Thereby, the part on the opposite side to the eccentric side of the film parts 31 and 32 can be surely in contact with the reinforcing bar 3. As a result, the space between the sleeve joint 10 and the reinforcing bar 3 can be reliably sealed.

  11 to 13 show a third embodiment of the present invention. The third embodiment relates to a modification of the bowl-shaped flexible membrane portion of the second embodiment. As shown in FIG. 11, in the seal member 30 </ b> B of the third embodiment, almost all of the membrane portions 31 and 32 are bent so as to have a smooth wavy cross section, and a plurality of bowl-shaped flexible membrane portions 38 are formed. Is formed. The radially outer flange portion 38a and the radially inner flange portion 38b of each flexible membrane portion 38 are smoothly continuous. As shown in FIG. 12, in the natural state (when not deformed), the plurality of flexible membrane portions 38 are concentric circles surrounding the holes 31a and 32a in the same manner as the flexible membrane portion 37 of the second embodiment. is there.

  As shown in FIG. 13, when the reinforcing bar 3 is decentered, moments radially inward (downward in FIG. 13) are generated in the flange portions 38a and 38b of the flexible film portions 38 on the side opposite to the eccentric side. In operation, each flexible membrane portion 38 expands in the radial direction. Therefore, as in the second embodiment, the portions of the membrane portions 31 and 32 opposite to the eccentric side extend generally radially inward than in the natural state shown by the phantom lines in FIG. Thereby, the part on the opposite side to the eccentric side of the film portions 31 and 32 can be surely in contact with the reinforcing bar 3, and the sleeve joint 10 and the reinforcing bar 3 can be reliably sealed.

The present invention is not limited to the above-described embodiment, and various modifications can be made without changing the gist of the invention.
For example, the seal member 30 of the present invention may be attached to both ends of the sleeve joint 10. The flexible membrane portions 36, 37, and 38 may also be provided on the seal member 20 on the large-diameter rebar 2 side.
The seal member of the present invention can be applied even when connecting reinforcing bars of the same diameter.
The seal member of the present invention can be applied regardless of the presence or absence of rebar eccentricity. Even when the reinforcing bars 2 and 3 are not pressed by the bolts 4, the seal member of the present invention can be applied.
You may accommodate the 2nd sealing member of patent document 1 between the film parts 31, 32, or 21,22 in a nested form.
The step-like flexible membrane portion 36 may be provided in the intermediate portion in the radial direction of the membrane portion 31.
The thickness of the flexible membrane portion 36 may be larger than the thickness of the flat membrane portion 34.
The flexible membrane portion 36 may be configured by a step that is recessed inward in the axial direction from the flat membrane portion 34.
A plurality of step-like flexible film portions 36 may be provided concentrically on the film portion 31.
The film part 31 may be provided with only one flexible film part 37 or 38 having a bowl shape.
The rim portion 35 may be omitted. The thickness of the rim portion 35 may be the same as the thickness of the flat membrane portion 34.
The film portion 32 of the first embodiment may also be provided with a flexible film portion 36.
A plurality of embodiments may be combined with each other. For example, a step-like flexible membrane portion 36 and bowl-like flexible membrane portions 37 and 38 may be mixed in the membrane portion 31.

  The present invention can be applied to, for example, connecting building reinforcing bars.

DESCRIPTION OF SYMBOLS 1 Connecting device 2 Large diameter reinforcing bar 3 Small diameter reinforcing bar 4 Bolt 5 Grout agent 10 Sleeve joint 11 Housing groove 12 Opening 14 Screw hole 15 Supporting protrusion 20 Large diameter side seal member 21, 22 Film part 21a, 22a Hole 23 Peripheral wall part 30 Sealing member 30A, 30B on the small diameter side Sealing member 31 Membrane portion 31a Hole 32 Membrane portion 32a Hole 33 Peripheral wall portion 34 Flat membrane portion 35 Rim portion 36 Step-like flexible membrane portion 37, 38 Saddle-like flexible membrane portion 37a , 38a Radial outer flange portion 37b, 38b Radial inner flange portion D ₂ Large diameter reinforcing bar eccentric amount D ₃ Small diameter reinforcing bar eccentric amount L ₂ Large diameter reinforcing bar axis L ₃ Small diameter reinforcing bar axis L ₁₀ Sleeve Axis

Claims (3)

An annular seal member provided between the inner periphery of the axial end portion of the reinforcing bar connecting sleeve joint and the outer periphery of the reinforcing bar inserted into the reinforcing bar connecting sleeve joint,
The membrane portion is integrally provided with an annular peripheral wall portion provided on the outer periphery of the membrane portion and fixed to the sleeve joint, and the membrane portion is formed in a disk shape having a hole through which the reinforcing bar passes in the center. seen containing a flat membrane portion than the peripheral wall portion disposed to protrude to the outside of the axial direction, the flexible membrane portion consisting of the step portion of the annular between the outer peripheral portion and the peripheral wall portion of the flat membrane portion, Due to the eccentricity of the reinforcing bar with respect to the reinforcing bar connecting sleeve joint, the part of the flexible membrane part opposite to the eccentric side is bent and deformed so as to incline radially inward toward the flat membrane part. A seal member characterized by the above.   2. The seal member according to claim 1, wherein a thickness of the flexible membrane portion is equal to or less than a thickness of a portion of the membrane portion that is radially inward of the flexible membrane portion. 3. The seal according to claim 1, wherein a rim portion thicker than a portion radially outer than the inner peripheral edge of the film portion is provided on an inner peripheral edge of the hole of the film portion. Element.

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