JP4871151B2 - Water stop band for fastening all around - Google Patents

Description

  The present invention relates to a water stop band attached to a pipe.

  In general, when providing a watertight member having a watertight structure in a pipe body such as a water pipe, by tightening the watertight member on the outer peripheral side toward the pipe body located on the inner peripheral side using a tightening member, A water stop band is used to secure both.

  As this type of water stop band, for example, what are called a split type band, a worm gear band, and a band it are well known.

  As shown in FIG. 5, the split-type band 10 connects the saddle members 11 and 11 by connecting the opposing flange portions 11a and 11a of the arc-shaped saddle members 11 and 11 using bolts 15a and nuts 15b. It is connected in a ring shape. By screwing the bolt 15a into the nut 15b, the water stop member (water-tight member) 2 provided on the outer periphery of the tube body p is tightened to the inner diameter side, and the water stop member 2 is in close contact with and fixed to the tube body p. .

Further, for example, there is a water stop band 10 'shown in FIG. The waterstop band 10 'is provided with a C-shaped band portion 11' covering the outer periphery of the pipe joint portion, and bolt fastening portions 12, 12 provided at opposite ends of the C-shaped band portion 11 '. Is configured.
Each bolt fastening portion 12 is formed in an annular shape by folding both ends of the band portion 11 outward in the radial direction and fixing the folded portion to the outer surface of the band portion 11 by welding or the like.

A metal washer 13 and a metal nut 14 having a shaft shape or a cylindrical shape are inserted into the bolt fastening portion 12. Each of the metal washer 13 and the metal nut 14 has a bolt insertion hole orthogonal to the axial direction in a part of its axial or cylindrical body, and among these, the bolt insertion hole of the metal nut 14 has a bolt insertion hole. A female thread portion is formed.
The C-shaped band portion 11 ′ is directed to the outer periphery of the pipe joint portion, the bolt fastening portions 12, 12 are opposed to each other in the circumferential direction, and the connecting bolt 15 is inserted into the metal washer 13. The band portion 11 ′ is tightened toward the inner diameter side by screwing the tip of the connecting bolt 15 into the female screw portion of the metal nut 14 (see, for example, Patent Document 1 and Patent Document 2).

JP-B-2-53669 JP 2001-193877 A

According to the water stop band 10 shown in FIG. 5, the arc-shaped band portions 11, 11 are configured to be fastened with bolts 15 a and nuts 15 b, and therefore a gap w between the flange portions 11 a, 11 a of the band portions 11, 11. Intervenes.
For this reason, there is a problem that the surface pressure (surface pressure tightened in the inner diameter direction) by the tightening member 5 does not act on the water stop member 2 on the outer periphery of the pipe body p corresponding to the gap w. If the water stop band 10 is tightened too much, a gap may be formed between the pipe body p and the water stop member 2.

  Similarly, when the water stop band 10 ′ shown in FIG. 6 is used, the C-shaped band portion 11 ′ is discontinuous between the bolt fastening portions 12 and 12 facing each other. There is a problem that the surface pressure by the tightening member 5 does not act on the outer periphery of the tubular body p corresponding to the portion.

In this regard, according to the worm gear band or band-it, the discontinuous portion as described above can be set to a minimum range. However, in general, the worm gear band is composed of a thin plate-like fastening member wound around the tube body and a worm gear portion that fastens the fastening member in the inner diameter direction, and is high at the connection portion between the fastening member and the worm gear portion. I cannot expect strength. For this reason, the use is limited to a small-diameter tube and a tube intended for a low-pressure fluid.
Further, since Bandit has a weak tightening force, its use is also limited to a small-diameter tube and a tube intended for a low-pressure fluid.

  Therefore, the present invention continuously applies the surface pressure by the fastening member for fixing the watertight member to the outer periphery of the tubular body on the entire outer periphery of the tubular body, and also provides a large-diameter tubular body and a high-pressure fluid. It is an issue to make a water stop band that can cope with the situation.

  In order to solve the above-mentioned problems, the present invention is configured such that a tubular member is fitted to the outer periphery of a tubular body, and the outer periphery of the tubular member is tightened to the inner diameter side by a tightening member. In the waterstop band for fixing the tubular member, the fastening member has a band portion wound around the entire outer periphery of the tubular member, and both ends of the band portion in the winding direction are pipes. Winding in an overlapping direction around the axis to form overlapping portions, and locking portions are provided at both ends in the winding direction, respectively, and around the locking portions outside the overlapping portion of the band portion. Each of the locked portions facing each other is provided, and each of the locking portions and each of the locked portions facing each of the locking portions are locked and pulled in the circumferential direction. All-round tightening characterized by having locking means for tightening the part to the inner diameter side over the entire circumference Adopting the configuration of the Yotomesui band.

Since the band member that can be wound around the entire outer periphery of the cylindrical member is used as the tightening member, an overlapping part that is wound in the direction overlapping the tube axis is formed in the band part. Including the cylindrical member and the band part can be continuously adhered over the entire circumference.
Also, locking portions are provided at both ends of the band portion, i.e., at both ends in the circumferential direction of the overlapping portion, and each locking portion and a locked portion provided outside the overlapping portion are provided. Since each is configured to be locked and pulled, the surface pressure by the tightening member can be continuously applied to the entire outer periphery of the tubular body.

When the band part is wound around the entire outer periphery of the cylindrical member, for example, the both ends in the winding direction of the band part can be overlapped in the radial direction to be doubled. However, when both end portions of the band portion are overlapped in the radial direction, the end portion on the radially inner side of the both end portions is hidden by the band portion on the radially outer side, and as a result, on the hidden side The locking portion provided at the end is also hidden, and it is difficult to lock and tighten the locked portion.
For this reason, a hole penetrating in the radial direction is formed in the band portion located on the radially outer side of the overlapping portion, and the end portion located on the radially inner side is inserted into the hole. The method of pulling out to the outer diameter side is mentioned. If it does in this way, both ends of a band part will be exposed to the outer diameter side, respectively, and it will become easy to carry out latching and tightening of a locking part and a locked part which counters the locking part.

  Moreover, you may arrange | position as a process of the said overlapping part so that the band part concerning an overlapping part may be juxtaposed in a pipe-axis direction, without overlapping in a radial direction. In this way, both end portions of the band portion are not exposed and hidden on the outer diameter side.

Further, both end portions in the winding direction of the band portion are comb-toothed with a plurality of projecting pieces extending in the circumferential direction in parallel along the tube axis direction, and the overlapping portion in the winding state includes the winding portion. You may employ | adopt the structure which each protrusion piece of a rotation direction both ends alternately parallel in a pipe-axis direction.
If both ends of the band portion are comb-shaped and the protruding pieces of the opposing comb teeth are alternately arranged in the tube axis direction, the protruding pieces and the recesses of the opposing comb teeth are mutually connected. Surface pressure is applied to the expansion / contraction cover in a meshed state. For this reason, the surface pressure acting on the overlapping portion can be maintained in a more uniform state without discontinuity.

  In this invention, the surface pressure by the tightening member for fixing the watertight member to the outer periphery of the tube body is continuously applied to the entire outer periphery of the tube body, and also to a large-diameter tube body and a high-pressure fluid. It can be set as the water stop band which can respond.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the all-around fastening water stop band of this embodiment is a water pipe bridge provided by connecting the abutments A and A when the water pipe crosses a river, a road, a railroad, etc. Used for B.

  In this water pipe bridge B, in order to absorb the tensile force, pushing force and bending acting on the pipe body p due to the expansion and contraction of the pipe body p due to the temperature change and the substructure displacement due to earthquake etc. The telescopic tube 1 is provided on the side.

  The telescopic tube 1 is provided with a tube body 1a having a diameter slightly larger than that of the tube body p on the outer periphery of a joint portion between the tube bodies p and p, and a sealing material 1b fixed by a ring-shaped fixing member 1c. Normally, the pipes p and p that are abutted are fixed to each other at a distance t. When a large external force is applied when the pipe expands or contracts due to a temperature change, a slip occurs between the sealing material 1b and the fixing member 1c and the outer peripheral surface of the pipe body p, and the water pipe has its pipe axis. It can be expanded and contracted along the direction.

The outer periphery of the expansion tube 1 is covered with a rubber expansion / contraction cover (cylindrical member) 2 over the entire periphery and the entire length thereof. The stretchable cover 2 is constructed by winding a flexible watertight rubber sheet having flexibility and stretchability into a cylindrical shape. Both ends in the axial direction of the expansion / contraction cover 2 are fastened to the inner diameter side by the fastening members 5 with respect to the fixtures 3 and 3 of the pipes p and p on both sides of the expansion / contraction tube 1 and fixed in a watertight manner. Has been.
When the telescopic tube 1 is detached from the tube body p due to the earthquake motion, the telescopic cover 2 is deformed, and the water tightness of both the tube bodies p and p is maintained via the telescopic cover 2. For this reason, leakage of the water pipe bridge B is prevented, and the water flow function is not hindered.

  In this embodiment, the fixture 3 employs an annular member having an H-shaped cross section, and is fixed to the outer periphery of the pipe body p by welding. The fixture 3 may be fixed to the outer peripheral surface of the tube body p by fastening or the like. The rubber sheet may be a tube formed in a cylindrical shape in advance, or a flat sheet may be wound once (see FIG. 2 (c)) or wound twice or more. (See FIG. 2D) to form a cylinder. Further, two or more rubber sheets may be used in combination, and may be fixed by winding once or twice or more if necessary (see FIG. 2 (e)).

  The fastening member 5 employs a metal fixing band 20 shown in FIGS. As shown in FIG. 3, the configuration of the fixing band 20 is a flat metal sheet having a length L2 that is slightly shorter than the circumferential length L1 in the circumferential direction of the outer peripheral surface of the fixture 3 around which the telescopic cover 2 is wound. The sheet portion S having a rectangular shape in plan view, locking portions 22a and 23a provided at both ends of the sheet portion S, and locked portions 22b and 23b are provided.

  The entire length of the band portion 21 including the seat portion S and the locking portions 22a, 22b, 23a, 23b (the total length in the winding direction around the tube axis of the tube body p) L5 is greater than the circumferential length L1. Is also getting longer. For this reason, in the state which wound the band part 21 on the outer periphery of the said expansion-contraction cover 2, as shown in FIG.2 (b), the winding direction both ends 22,23 of the said band part 21 overlap with the circumferential direction. An overlapping portion L4 that is a portion wound in the direction is formed.

  In addition, with the band portion 21 wound around the outer periphery of the telescopic cover 2, as shown in FIG. 2B, the locking portion 22a and the locked portion 22b corresponding thereto are also locked. The part 23a and the corresponding locked part 23b face each other with a distance L3 in the circumferential direction.

  Each of the locking portions 22a and 23a and the locked portions 22b and 23b is formed by folding a metal sheet made of the same material as the sheet S in half and welding the overlapped metal sheets. The annular portion is formed by joining with the like.

Each of the locking portions 22a and 23a becomes a protruding piece that protrudes and extends in the circumferential direction from the edge of the sheet portion S, and a plurality of the protruding pieces are arranged in parallel along the tube axis direction to form a comb tooth shape. Yes. In other words, a plurality of the locking portions 22a and 23a are provided in a comb shape in parallel.
Similarly, the locked portions 22b and 23b facing the locking portions 22a and 23a in the circumferential direction are also provided in a comb-like shape.

  In this embodiment, the locking portion 22a and the locked portion 22b are arranged at three positions in the direction orthogonal to the length L2 direction of the sheet portion S, and the locking portion 23a and the locked portion 23b are set at four equal intervals, respectively. Is provided.

  It is possible to freely set how many of the respective locking portions 22a and 23a and the respective locked portions 22b and 23b are provided in the direction perpendicular to the length L2 direction of the sheet portion S. It can also be a pair.

  Since the overlapping part L4 has comb teeth at both ends 22 and 23 in the winding direction of the band part 21, as shown schematically in FIGS. 4 (a) and 4 (b). In addition, each protruding piece (locking portion 22a) forming one comb tooth enters a gap between the protruding pieces (locking portion 23a) of the other comb tooth facing each other, and both protruding pieces are alternately arranged in the tube axis direction. They are in parallel.

  In this state, as shown in FIG. 2B, the locking portion 22a and the locked portion 22b, and the locking portion 23a and the locked portion 23b are locked by the locking means 30 in the circumferential direction. Draw.

  As shown in FIG. 3 (c), the locking means 30 includes shaft-like connecting pins that can be inserted into the locking portion 22a and the locked portion 22b, and the locking portion 23a and the locked portion 23b, respectively. 32a, 32b; 33a, 33b, and the joining brackets 32, 33 including the bolt shaft 31, the locking portion 22a and the locked portion 22b, and the locking portion 23a and the locked portion 23b are locked. The end portions 22 and 23 in the winding direction of the band portion 21 are connected in the circumferential direction.

  In FIG. 3C, symbol a indicates a bolt insertion hole having a female thread groove, symbol b indicates a bolt insertion hole having no thread groove, and symbol c indicates a seat on which each head of the bolt shaft 31 fits. Showing a chestnut. The connecting pins 32b and 33b may be semicircular with only the bolt insertion hole b and no counterbore c.

The distances L3 and L3 between the connecting pins 32a and 32b and the connecting pins 33a and 33b of the joint fittings 32 and 33 are set to arbitrary lengths within a predetermined range by adjusting the screwing degree of the bolt shafts 31 and 31, respectively. can do.
For this reason, by rotating each bolt shaft 31, 31 around the axis, the band portion 21 is tightened to the inner diameter side over the entire circumference. By this tightening, the elastic cover 2 is pressed against the fixture 3 and fixed in a watertight manner. Further, if the degree of rotation of the bolt shaft 31 is appropriately adjusted, the degree of tightening of the outer peripheral surface of the fixture 3 can be increased or decreased.

  At this time, since the band portion 21 is wound in a direction overlapping in the circumferential direction at the overlapping portion L4, the band portion 21 and the stretchable cover 2 are in close contact with each other without any discontinuous portion. To do. For this reason, a surface pressure is continuously applied to the stretchable cover 2 over the entire circumference, and high water tightness can be ensured.

In this embodiment, the entire circumference of the expansion / contraction cover 2 is covered with one fixed band 20, but for example, two or more fixed bands 20 may be used.
That is, the fixed band 20 is divided into a plurality in the circumferential direction, and the respective locking portions 22a, 23a, Locked portions 22b and 23b are provided, and the locking portion 22a and the locked portion 22b facing each other and the locking portion 23a and the locked portion 23b are locked in the circumferential direction by the locking means 30, respectively. It is good also as a structure which tightens.

  In addition, when the internal pressure in the pipes p and p becomes high, the expansion / contraction cover 2 rises radially outward and tries to push the fixing band 20 outward in the pipe axial direction. Therefore, in order to prevent the fixing band 20 from being detached from the fixing tool 3, as shown in FIG. You may provide in p.

  In this embodiment, the all-around fastening water stop band of the present invention is employed in the rubber expansion / contraction cover 2 in the expansion / contraction pipe 1 of the water pipe bridge B using the pipe body p having a relatively large diameter. However, this all-round fastening water stop band has a wide water-tight structure in various pipes p such as water pipes regardless of the diameter, the type of fluid flowing in the pipe p, and the pressure level. It can be used when providing a watertight member.

Cross-sectional view of one embodiment (A) The perspective view which shows the state which attached the expansion-contraction cover and the fastening member to the outer periphery of an expansion-contraction pipe, (b) is sectional drawing of (a), (c) (d) (e) is the structure of an expansion-contraction cover, respectively. Schematic shown (A) is a plan view of a fastening member of an expansion / contraction cover, (b) is a front view of the same, and (c) is a detailed view of a connection fitting. The detail of a fastening member is shown, (a) is a top view, (b) is a front view Side view of conventional example Side view of conventional example

Explanation of symbols

1 Stretchable tube 2 Tubular member (stretchable cover, watertight member)
3 Fixing tool 5 Fastening member 10, 10 'Water stop band 20 Fixation band (water stop band)
21 Band part 22a, 23a Locking part 22b, 23b Locked part 30 Locking means 31 Bolt shaft 32, 33 Joint metal fittings 32a, 32b, 33a, 33b Connecting pin A Abutment B Water pipe bridge p Pipe body S Sheet part

Claims (3)

A tubular member (2) is fitted on the outer periphery of the tubular body (p), and the outer periphery of the tubular member (2) is tightened to the inner diameter side by a tightening member (5), whereby the tubular body (p) And a water stop band for fixing the tubular member (2),
The fastening member (5) is made of a metal sheet and has a band part (21) wound around the entire outer periphery of the cylindrical member (2). The winding of the band part (21) Both end portions (22, 23) in the turning direction are wound in an overlapping direction around the tube axis to form an overlapping portion (L4), and both end portions (22, 23) in the winding direction extend in the circumferential direction. A plurality of pieces are arranged in parallel along the tube axis direction to form a comb-teeth shape, and the overlapping portions (L4) in the wound state are formed by projecting pieces at both ends (22, 23) in the winding direction. In parallel in the direction,
Engaging portions (22a, 23a) are provided on the projecting pieces at both ends (22, 23) in the winding direction, respectively, and the engaging portions (22a, 23a) are strip-shaped members constituting the projecting pieces. The band-shaped extension of the metal sheet is formed by folding the circumferentially extending portion of the metal sheet to the outer diameter side and joining the folded tip to the base of each protruding piece. The outer surface of the fastening member (5) on the outer side in the circumferential direction of the portion (L4) is opposed to the both locking portions (22a, 23a) in the circumferential direction, and a band-shaped metal sheet is placed between both ends of the band. Folded portions (22b, 23b) formed by folding and joining both ends to the outer surface are provided, and each of the locking portions (22a, 23a) and each of the locking portions (22a, 23a), each of the locked parts (22b, 23) The) and provided with locking means (30) is tightened on the inner diameter side over the band portion (21) on the entire circumference in the circumferential direction on both sides by pulling each and engaged with the circumferential direction of the overlapping portion (L4) A water stop band for fastening all around. It is a fastening member (5) comprised with the metal sheet | seat used for the water-stop band for all-around fastening of Claim 1, Comprising: It can wind around the outer periphery perimeter of the said cylindrical member (2). A band part (21), and the band part (21) is wound in the winding state in such a manner that both ends (22, 23) in the winding direction overlap around the tube axis. L4), and the winding direction both ends (22, 23) each have a plurality of protruding pieces extending in the circumferential direction in parallel along the tube axis direction to form a comb-teeth shape, The overlapping portions (L4) in the winding state are such that the protruding pieces of the both ends (22, 23) in the winding direction are alternately arranged in the tube axis direction, and both ends (22, 23) in the winding direction. each locking portion protruding pieces of (22a, 23a) is provided, the locking portion (22a, 23a), the respective Piece is formed by joining the folded tip at the base of the protruding pieces of the strip-shaped extension to the circumferential direction of the strip-shaped metal sheets forming folded radially outward of said band A strip-shaped metal sheet that faces the outer surface of the fastening member (5) on the outer side in the circumferential direction of the overlapping portion (L4) of the portion (21) in the circumferential direction with respect to the locking portions (22a, 23a). Are provided between the both ends of the belt and joined to the outer surface, and the respective locking portions (22a, 23a) and the locking portions (22a, 23a) are provided. The band portion is obtained by locking the locked portions (22b, 23b) facing the locking portions (22a, 23a) on both sides in the circumferential direction of the overlapping portion (L4) and pulling them in the circumferential direction. (21) on the inner diameter side over the entire circumference The locking means (30) that can be attached is between the locking portions (22a, 23a) and the locked portions (22b, 23b) facing the locking portions (22a, 23a). Fastening member that can be attached to. The cylindrical member (2) is a stretchable cover that covers the outer circumference of the stretchable tube (1) that has flexibility and connects the tubular bodies (p, p) over the entire length in the tube axis direction. The outer circumferential fastening water stop bands according to claim 1 are provided at both ends of the telescopic cover in the tube axis direction, respectively, and the both outer pipes (p, p) Leakage prevention device for telescopic tubes fixed in a watertight manner.

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