JP2005016282A - Expansive flexible joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exhibit excellent sealing performance with no possibility of both ends of an elastic seal member entirely falling out or being sheared. <P>SOLUTION: This expansive flexible joint is provided with fittings B, C; a pair of cylindrical bodies E fixed to the fittings almost coaxially with a prescribed space; the cylindrical elastic seal member F with both end openings 2 fitted inside straddling butt ends 3 of both cylindrical bodies; cylindrical pressing members 4 with smooth outer peripheral surfaces pressing the inner peripheral surfaces 2b of both end openings of the seal member; clamping members G for clamp-fixing the respective pressing members to the cylindrical bodies; and annular stopper members 5 protrusively provided at butt end faces 3b of the respective cylindrical bodies and extending in a direction (b) orthogonal to a direction (a) extending along center axes of the respective cylindrical bodies. Inner end faces 2c at both end openings of the elastic seal member pressed by the pressing members are brought into pressure contact with outer end faces 5a of the stopper members. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Industrial application fields]
The present invention is an elastic flexible that connects both ends of a culvert such as water and sewage and a common groove with elasticity and flexibility so as to stop water flowing out of the ground from entering the interior of the culvert. It relates to joints.
[0002]
[Prior art]
Conventionally, when a water supply / sewerage system or a common ditch is constructed in the water discharge ground, a starting vertical shaft is formed at the start end thereof, and an annular outer frame body fixed to the near side of the vertical shaft wall, and the outer frame An annular inner frame fixed opposite to the back side of the body is disposed opposite to each other with a predetermined interval, and a pair of cylindrical bodies are arranged substantially concentrically on the opposing surface of each frame. It is possible to extend and stop the water with expansion and contraction by connecting and fixing a cylindrical elastic seal member straddling between the butted ends of both cylindrical bodies. .
[0003]
Conventionally, as this stretchable flexible joint, for example, one disclosed in Japanese Patent No. 2557378 is known.
Hereinafter, the technical contents disclosed in the publication will be described with reference to FIGS.
As shown in FIG. 9, in the flexible joint 100, for example, a pair of annular attachment members 101 having a square cross section are arranged concentrically and opposed to each other with a predetermined interval, and the opposing attachment members are opposed to each other. A cylindrical elastic seal member 102 is disposed between the butted ends of the cylindrical body 101 a protruding from the surface, and both end portions 102 a of the seal member are connected and fixed by the fixing member 103.
[0004]
As shown in FIG. 10, the both end portions 102a of the seal member 102 have inclined surfaces 102c whose thickness increases as they approach the outer end surface 102b on the inner peripheral surface, and this is the cylindrical body 101a. A substantially similar inclined surface 104a is formed on the joint surface of the annular pressing member 104 sandwiched therewith.
In the above configuration, for example, when an external pressure P such as water pressure or earth and sand is urged to the elastic seal member 102, a tension T is generated on the seal member and pulled, and the thick portions of both end portions 102a are inclined surfaces 102c. There is an advantage such that the sealing performance is improved.
[0005]
[Problems to be solved by the invention]
However, according to the above configuration, the angle θ formed by the direction a along the central axis of the cylindrical elastic seal member 102 and the action line direction of the tension T biased by the seal member 102 becomes an acute angle, and the a direction There is a problem that the component force Ta urged to is relatively large, and the seal member 102 is sheared at the base portion 102d which is the inner end portion of the sandwiching, or cannot be sandwiched and falls off completely.
In the drawing, b indicates the diameter direction of the seal member 102 orthogonal to the direction a along the central axis direction.
[0006]
Conventionally, in order to improve this, as shown in FIG. 11, a flexible joint in which both end portions 102a of the elastic seal member 102 are reinforced by a metal plate 105 or a bifurcated reinforcing member 102e made of fiber is disclosed. (See Japanese Patent No. 2623277).
However, according to this configuration, there is a problem that the elastic seal member 102 is expensive.
[0007]
Further, conventionally, as shown in FIG. 12, the flexible joint 100 has both ends 102a of the elastic seal member 102 fastened and connected to each other by fastening the pressing member 104 with the fastening member 103 including the bolt 103a and the nuts 103b and 103c. A known one is known (see Japanese Patent Laid-Open No. 2-85435).
According to the flexible joint 100, the other projection 104c strongly presses the base portion 102d of the seal member 102 with the projection 104b of the pressing member 104 as a fulcrum, thereby improving the sealing performance. be able to.
[0008]
However, even in the above configuration, the angle θ formed by the direction a along the central axis of the elastic seal member 102 and the direction of the action line of the tension T biased by the seal member 102 is an acute angle, and is biased in the direction a. There is a problem that the component force Ta is relatively large and cannot be pinched and falls off completely.
Further, in order to prevent this, when the tightening force of the tightening member 103 is increased, there is a problem that the base portion 102d shears.
[0009]
The present invention has been made to solve the above problems, and one object of the present invention is to provide an elastic flexible joint with excellent sealing performance that does not cause the elastic seal member to fall off or be sheared. Is to provide.
Another object of the present invention is to provide an inexpensive elastic flexible joint with a simple structure.
Still another object of the present invention is to provide a stretchable flexible joint that is easy to assemble and exhibits a highly reliable sealing performance.
[0010]
[Means for Solving the Problems]
A stretchable flexible joint according to a first aspect of the present invention includes a mounting bracket, a pair of cylindrical bodies fixed to the mounting bracket substantially coaxially at a predetermined interval, and both the cylindrical bodies. A cylindrical elastic sealing member having both ends opened to fit between the butted ends, and a cylindrical outer surface having a smooth outer peripheral surface that presses the inner peripheral surface of the both ends opening of the sealing member A pressing member, a tightening member that fastens and fixes each of the pressing members to the cylindrical body, and a diameter projecting from a butt end surface of the cylindrical body and perpendicular to a direction along the central axis of the cylindrical body And an annular stopper member extending in the direction, and the inner end surfaces of the both end openings of the elastic seal member pressed by the pressing member are pressed against the outer end surface of the stopper member.
[0011]
According to a second aspect of the present invention, there is provided a stretchable flexible joint, wherein an annular groove around the central axis is formed on the inner peripheral surface of the butt end portion of each cylindrical body, and both ends of the elastic seal member are formed in the annular groove. The stopper member fitted into the opening and pressed against the inner end face of the opening at both ends is constituted by an inner peripheral wall of the annular groove.
Stretchable flexible joint.
[0012]
According to a third aspect of the present invention, there is provided the elastic flexible joint, wherein an anchor bolt projects from the outer peripheral surface of each cylindrical body, and the annular bracket extends in the diametrical direction at at least one end at both ends of the cylindrical body. The anchor bolt is embedded in a cement block assembled separately, and the outer peripheral surface of the annular bracket and the cylindrical body is joined to the inner peripheral surface of each block and fixed. Features.
[0013]
According to a fourth aspect of the present invention, there is provided an elastic flexible joint, wherein an anchor bolt projects from an outer peripheral surface of each tubular body, and an annular bracket extends radially outward at both ends of the tubular body. An annular bracket extending inward, the anchor bolts are embedded in a separately assembled cement block, and the annular bracket extending outward in the diametrical direction has a stopper member at its inner end. It extends inward in the diametrical direction so as to be projected on the butted end face of each cylindrical body.
[0014]
[Action]
According to the first aspect of the present invention, the opening portions at both ends of the elastic seal member are clamped between the butted end portion of the cylindrical body and the pressing member by tightening of the tightening member, and are pressed against the stopper member in the withdrawal direction. Therefore, even when the external pressure is urged and pulled by the elastic seal member, there is no possibility that it will fall off.
Moreover, the base part of the both-ends opening part of a seal member and a seal main-body part is hold | maintained on the smooth outer peripheral surface of a press member, and there is no possibility of shearing.
Further, when a strong external pressure is applied to the seal member, the pressure member is supported in a cantilevered manner, absorbs tension by the bending operation, and can effectively prevent shearing of the base portion. .
[0015]
According to the invention of claim 2, by forming the stopper member by forming the annular groove, it is possible to provide a stretchable flexible joint with a simple structure and low cost and good assemblability.
According to invention of Claim 3 and 4, while mounting an anchor bolt on the outer peripheral surface of each cylindrical body, an annular bracket is protrudingly provided in the edge part of the said cylindrical body, and each said anchor bolt is made into a different body. By embedding in the assembled cement block and joining the outer peripheral surface of the annular bracket and the cylindrical body to the inner peripheral surface of each of the blocks, assembly work is easy, and reliable sealing performance can be exhibited. it can.
[0016]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic longitudinal sectional view showing an example of a flexible expansion joint according to the present invention installed on a starting shaft wall.
In the figure, the expansion joint 1 includes an annular outer frame B fixed to the front side of the shaft wall A, and an annular inner frame fixed to one end of the segment block K facing the back side of the outer frame. The frame body C is disposed opposite to the frame body C at a predetermined interval, and a pair of cylindrical bodies E are provided substantially concentrically on the opposing surfaces of the frame bodies B and C so as to protrude at a predetermined interval. By connecting and fixing the cylindrical elastic seal member F straddling between the butt end portions 3 of both the cylindrical bodies E, the water can be expanded and contracted and water can be stopped with flexibility. .
[0017]
As shown in FIG. 2, the sealing member F has a cylindrical both-end opening 2 formed thick, and an outer peripheral surface 2 a of the both-end opening 2 is an inner peripheral surface of the butted end 3 of the cylindrical body E. 3a, the inner peripheral surface 2b of the opening 2 on both ends is pressed on the outer peripheral surface 4b of the annular pressing piece 4a in the cylindrical pressing member 4, and the inner end surface 2c of the opening 2 on both ends is The outer end surface 5a of the annular stopper member 5 fixed to the butt end portion 3 of the cylindrical body E is pressed against.
[0018]
That is, the pressing member 4 includes an annular pressing piece 4 a that presses the inner peripheral surface 2 b of the both end opening 2 in the seal member F, and an annular boss that faces the outer end surface 2 d in the both end opening 2 of the sealing member F. The part 4c is integrally formed, and the bolt 6a is inserted into the mounting hole 4d formed in the boss part 4c, screwed into the inner peripheral surface 3a of the butted end 3 of the cylindrical body E, and welded. The bolt 6a and the nut 6b are fixed with a fastening member G.
[0019]
A cylindrical protective member H is disposed substantially concentrically facing the inner peripheral surface of the pressing member 4, and one end of the protective member H is a long bolt 7 a in the other fastening member G. Is clamped and fixed by another pair of nuts 7b and 7c.
Further, another cylindrical protection member J is fitted and fixed to each butting end 3 of the cylindrical body E in a substantially concentric manner.
[0020]
Next, the mounting and construction method of the expansion joint 1 will be described.
First, as shown in FIG. 1, the bolt 8 protruding from the shaft wall A is inserted into the corresponding mounting hole of the outer frame body B and fixed by screwing the nut 9.
An annular inner frame C disposed opposite to the back side of the outer frame B is fixed by screwing a nut 12 into a bolt 11 inserted through an end portion 10 of the segment block K, so that each of the frames B, C is fixed. The cylindrical elastic seal member F is connected and fixed across the butted end portion 3 of the cylindrical body E protruding from the opposing surface.
[0021]
That is, as shown in FIG. 2, the seal member F has both ends 2 of the butted end 3 of the cylindrical body E, the pressing member 4 fitted therein, and the inside of the butted end 3. It is inserted into a space surrounded by the stopper member 5 fixed to the end surface 3b, and is fixed in a pressure contact state with the tightening member G by screwing the nut 6b into the bolt 6a.
After that, the ground is excavated, and reaches a reaching shaft wall (not shown) while being sealed with a substantially similar expansion joint.
[0022]
According to the above configuration, the both end openings 2 of the elastic seal member F are clamped between the butted end 3 of the tubular body E and the pressing member 4 by the tightening of the tightening member G, and the inner end surface 2c thereof. Is pressed against the outer end surface 5a of the stopper member 5 and is bent in a diameter direction b substantially perpendicular to the direction a along the central axis. For example, an external pressure P such as water pressure or earth and sand is urged by the elastic seal member 2. When the tension T is generated, the action line direction of the tension T urged by the base portion 2d of the opening 2 at both ends and the seal body portion 2e is the diameter direction b orthogonal to the a direction. There is no risk of falling off.
[0023]
That is, according to the above configuration, the opening portions 2 on both ends of the elastic seal member F are clamped between the butted end portion 3 of the cylindrical body E and the pressing member 4 by tightening the tightening member G, and the direction in which the elastic seal member F is pulled out. Since a is closed by the stopper member 5, even when a tension T is generated and pulled in the seal main body 2e, the root portion 2d has a component force Ta in the axial direction a like a conventional expansion joint. There is no possibility of falling off easily.
[0024]
Moreover, since the base 2d of the both-end opening part 2 of the said sealing member F and the seal main-body part 2e is hold | maintained at the smooth outer peripheral surface 4b of the press piece part 4a in the said press member 4, the said seal member F The urged external pressure P is received by the inner end face 4e of the pressing piece 4a and there is no fear of shearing.
Further, when a strong external pressure P is urged on the seal member F, the pressing piece 4a is cantilevered in a boss portion 4c so as to protrude in the direction a in a flange shape. When the tension T is generated and pulled, the tension T is absorbed by the bending operation in the b direction, and shearing of the root portion 2d can be effectively prevented.
Note that by forming an arcuate curvature surface at the upper edge portion of the inner end surface 4e of the base portion 2d, it is possible to prevent the shearing more effectively.
[0025]
3 and 4 are schematic longitudinal sectional views showing other examples of the expansion joint 1 according to the present invention. As shown in each drawing, the difference from the configuration of FIG. Even if the annular groove 14 is formed in the inner peripheral surface 3a of the butted end portion 3, the opening portions 2 of the seal member F are accommodated in the annular groove 14, and the stopper member 5 is formed by the inner side wall 14a. Good.
Further, as shown in FIG. 4, the inner side protection member H may be configured to project integrally with the pressing member 4 fixed by the fastening member G.
With these configurations, manufacturing and assembly operations are extremely easy and inexpensive.
Since other configurations and operational effects are substantially the same as those described above, the same or corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted.
[0026]
5 to 8 are schematic longitudinal sectional views showing other examples of different construction structures of the expansion joint 1 according to the present invention.
First, as shown in FIG. 5, anchor bolts J are protruded from the outer peripheral surface of each cylindrical body E in the expansion joint 1 by welding, and outward in the diametrical direction b at both ends of each cylindrical body E. An annular bracket 20 extending inward and an annular bracket 21 extending inwardly project, and each anchor bolt J is embedded in a cement block A composed of a shaft wall and a cement block K composed of a segment.
In the above configuration, when the anchor bolt J is embedded in each of the segment blocks A and K, the brackets 20 and 21 extending in the diametrical direction b and the outer peripheral surface of the cylindrical body E are joined to the blocks A and K to attach the mounting bracket. The functions of B1, B2, C1, and C2 can be achieved, and the cylindrical body E can be firmly fixed.
Therefore, the expansion joint 1 has a simple and solid construction structure, is easy to assemble, and can exhibit highly reliable sealing performance.
[0027]
In the construction structure described above, the stopper member 5 is fixed to the inner peripheral surface of the butt end 3 of each cylindrical body E by welding, but as shown in FIG. 6, the annular bracket extends outward in the diameter direction b. 22 is configured separately from each cylindrical body E, and its inner end 22a extends inward in the diametrical direction b and is fixed to the butt end 3 so that the stopper member 5 has a simple structure. It can be projected.
[0028]
Further, as shown in FIG. 7, an annular bracket 23 extending inward in the diametrical direction b at the opposite end of the butted end 3 in each tubular body E is formed integrally with each tubular body E. Thus, the stopper member 5 can be easily projected.
Further, as described in FIG. 3, when the annular groove 14 is formed on the inner peripheral surface of the butt end 3 in the cylindrical body E and the stopper member 5 is formed by the inner wall 14a, as shown in FIG. Further, by fixing the annular bracket 24 extending inward in the diametrical direction b to the other end of each cylindrical body E by welding, it is possible to achieve substantially the same operational effects as in the case described above.
[0029]
【The invention's effect】
As described above, according to the invention of claim 1, it is possible to provide a stretchable flexible joint having excellent sealing performance, in which there is no risk that the bullet housing seal member will fall off or be sheared.
In addition, according to the invention of claim 2, an inexpensive elastic flexible joint can be provided with a simple structure.
Furthermore, according to the invention of Claim 3 and 4, assembly construction is easy and it can exhibit highly reliable sealing performance.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing an example of a flexible expansion joint according to the present invention installed on a starting shaft wall.
FIG. 2 is an enlarged longitudinal sectional view showing a main part of the expansion joint.
FIG. 3 is a schematic longitudinal sectional view showing another example of the expansion joint.
FIG. 4 is a schematic longitudinal sectional view showing another example of the expansion joint.
FIG. 5 is a schematic longitudinal sectional view showing an example of a construction structure of the expansion joint.
FIG. 6 is a schematic longitudinal sectional view showing another example of the construction structure of the expansion joint.
FIG. 7 is a schematic longitudinal sectional view showing another example of the construction structure of the expansion joint.
FIG. 8 is a schematic longitudinal sectional view showing still another example of the construction structure of the expansion joint.
FIG. 9 is a schematic longitudinal sectional view showing an example of a conventional expansion joint.
FIG. 10 is an enlarged longitudinal sectional view showing a main part of the expansion joint.
FIG. 11 is a schematic longitudinal sectional view of a main part showing another example of a conventional expansion joint.
FIG. 12 is a schematic longitudinal sectional view showing another example of a conventional expansion joint.
[Explanation of symbols]
A cement block (shaft wall)
B Outer frame (mounting bracket)
C Inner frame (mounting bracket)
E Tubular body F Elastic seal member G Tightening member J Anchor bolt K Cement block (segment)
a direction along the central axis b diameter direction 2 both end openings 2b inner peripheral surface 2c inner end surface 3 abutting end 3a inner peripheral surface 3b abutting end surface 4 pressing member 4b outer peripheral surface 5 stopper member 5a outer end surface 14 annular groove 14a inner peripheral wall 20 Annular bracket 21 Annular bracket 22 Annular bracket 22a Inner side end 23 Annular bracket 24 Annular bracket

Claims (4)

A mounting bracket, a pair of cylindrical bodies fixed to the mounting bracket substantially coaxially at a predetermined interval, and both ends of the opening are fitted between the butted ends of both cylindrical bodies. A cylindrical elastic sealing member, a cylindrical pressing member having a smooth outer peripheral surface that presses the inner peripheral surface of the opening at both ends of the sealing member, and the pressing members are fastened and fixed to the cylindrical body. A clamping member, and an annular stopper member that protrudes from a butt end surface of each cylindrical body and extends in a diametrical direction perpendicular to a direction along the central axis of each cylindrical body. A stretchable flexible joint characterized in that the inner end face of the pressed opening of both ends of the elastic seal member is pressed against the outer end face of the stopper member. An annular groove around the central axis is formed on the inner peripheral surface of the butt end portion of each cylindrical body, and both opening portions of the elastic seal member are fitted into the annular groove, and the inner end surface of the both end opening portions is The stretchable flexible joint according to claim 1, wherein the stopper member to be pressed is configured by an inner peripheral wall of the annular groove. Anchor bolts projecting from the outer peripheral surface of each cylindrical body, and annular brackets extending in the diametrical direction are projected from at least one end of both ends of the cylindrical body, and the anchor bolts are assembled separately. The elastic flexible joint according to claim 1 or 2, wherein the elastic flexible joint is embedded in a cement block and fixed by joining the outer peripheral surface of the annular bracket and the cylindrical body to the inner peripheral surface of each block. . Anchor bolts project from the outer peripheral surface of each cylindrical body, and annular brackets extending radially outward and annular brackets projecting inwardly project from both ends of the cylindrical body. The above-mentioned annular bracket, which is embedded in a cement block assembled separately, and extends outward in the diametrical direction, extends inwardly in the diametrical direction so that its inner end becomes a stopper member. The stretchable flexible joint according to claim 1, wherein the stretchable flexible joint is protruded from a butt end surface of the body.

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