JP2013005598A - Protective tube movable support structure for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb variations of the arrangement distance and arrangement direction of cables accompanying a relative displacement between both bridge girders while downsizing and simplifying a protective tube movable support structure.SOLUTION: First movable support means D which supports one side part of a protective tube 3 in the tube axis core direction in which protective tube cables arranged over between both bridge girders B are inserted, such that the one side part is bendable in a three-dimensional direction while prevented from relatively moving in the tube axis core direction, is provided in a mounting part 4 of one bridge girder B of the bridge girders B adjacent to each other through a girder gap. Meanwhile, second movable support means E which supports the other side part of the protective tube 3 in the tube axis core direction, such that the other side part is bendable in a three-dimensional direction while allowed to relatively move in the tube axis core direction, is provided in a mounting part 5 of the other bridge girder B.

Description

  The present invention relates to a bridge protection tube movable support structure for supporting a protection tube of cables arranged between two adjacent bridge girders via a girder gap so as to be extendable and bendable.

  When supporting the protective pipes of cables arranged between both bridge girders so that they can be stretched and bent, the conventional cable protection technique disclosed in Patent Document 1 below is used to attach the protective pipes to the attachment parts of the two bridge girders. The outer slide protection tube in the expansion adjustment joint pipe having the inner and outer slide protection pipes that are slidably fitted in the longitudinal direction of the cables is installed, and the ends of the inner slide protection pipes of the both expansion adjustment joint pipes It can be considered that the bellows protective pipes that can be expanded and contracted are connected to each other, and the protective pipes for the cables are configured by the two expansion adjustment joint pipes and the bellows protective pipe.

JP 2006-246638 A

  In the bridge support pipe movable support structure described above, even if the bridge girder adjacent to each other via the girder gap is displaced in a three-dimensional direction (bridge axis direction and the direction perpendicular to the bridge axis) due to an earthquake, etc. Variations in the distance and direction of cables due to relative displacement in the cable can be absorbed by the expansion / contraction operation of both expansion / contraction adjustment joint pipes, the expansion / contraction of the bellows protection pipe, and the bending operation. Damage can be suppressed.

  On the other hand, since each of the two expansion adjustment joint pipes is composed of inner and outer slide protection pipes that are slidably fitted to extend and contract, the length of the protective pipe line between the mounting portions of both bridge girders is in the maximum contracted state. It is necessary to secure the protection pipe length that is the sum of the installation dimensions corresponding to the total length of both slide protection pipes and the bellows protection pipes, and there is a problem that the movable support structure for protection pipes becomes large and complicated. is there.

  The present invention has been made in view of the above-mentioned actual situation, and its main problem is to reduce the size and simplification of the protective tube movable support structure, while maintaining the cables associated with the relative displacement between the two bridge girders. The object is to provide a movable support structure for a protection pipe of a bridge capable of absorbing fluctuations in the arrangement distance and the arrangement direction.

A first characteristic configuration according to the present invention is a bridge protection tube movable support structure for supporting a protection tube of cables disposed between two adjacent bridge girders via a girder so as to be extendable and bendable. ,
A first movable support means for supporting one side portion of the protective tube in the tube axis direction in a state where the relative movement in the tube axis direction is prevented so as to be able to be bent in a three-dimensional direction is provided on the attachment portion of one bridge girder, The second bridge girder is provided with second movable support means for supporting the other side portion of the protective tube in the tube axis direction so as to be able to bend in the three-dimensional direction while allowing relative movement in the tube axis direction. There is a point.

  According to the above configuration, even if both bridge girders adjacent via the girder gap are displaced in a three-dimensional direction (bridge axis direction and a direction perpendicular to the bridge axis) due to an earthquake or the like, the bridge girder is provided at the attachment portion of one bridge girder. The bending operation in the three-dimensional direction at one side of the protective tube with respect to the first movable support means, and the axial direction of the tube at the other side of the protective tube with respect to the second movable support means provided at the attachment portion of the other bridge girder By the relative movement and the bending operation in the three-dimensional direction, it is possible to absorb the variation in the arrangement distance and the arrangement direction of the cables due to the relative displacement between the two bridge beams.

  Moreover, since one side portion of the protective tube and the first movable support means can be bent only relative to each other, and the other side portion is configured to be able to expand and contract and bend with respect to the second movable support means, Of these, many areas on the other side except for the attachment area for the first movable support means can be used as the expansion / contraction operation area for the second movable support means.

  Further, when the second movable support means is provided at the mounting portion of the other bridge girder, the other bridge girder is within the movable region on the other end side of the protective tube configured to be able to expand and contract with respect to the second movable support means. For example, when both sides of the protective tube are configured to be extendable and retractable in the tube axis direction with respect to the first and second movable support means. As described above, it is not necessary to secure an operation allowable space that allows the operation of both sides of the protective tube in both bridge girders.

Therefore, even if both bridge girders adjacent to each other through the girder gap are displaced in a three-dimensional direction due to an earthquake or the like, the cable disposition distance and the variation in the disposition direction due to the relative displacement between the two bridge girders are changed. It can be absorbed by the bending operation of the first and second movable support means and the expansion and contraction operation of the second movable support means, and damage to the protective conduit and cables can be suppressed.
Moreover, among the protective tubes, many areas on the other side except for the attachment area for the first movable support means can be used as the expansion / contraction operation area for the second movable support means, and the second movable support means Since it is only necessary to consider the mutual interference as to whether or not the other bridge girder is located in the movable region on the other end side of the protective tube configured to be stretchable and bendable, the protective tube movable support Assembling can be facilitated while miniaturizing and simplifying the structure.

  According to a second characteristic configuration of the present invention, the first movable support means includes a first inner ring having a partial spherical outer peripheral surface, and a three-dimensional direction along the partial spherical outer peripheral surface of the first inner ring. And a first outer ring having a partially spherical inner peripheral surface that is slidable on the inner surface, the first inner ring being fixed to one side of a protective tube, and the first outer ring being It is in the point fixed to the attachment part of one bridge girder.

  According to the above configuration, the partial spherical outer periphery of the first inner ring fixed to one side portion of the protective tube and the partial spherical inner periphery of the first outer ring fixed to the mounting portion of one bridge girder. By sliding with the surface, one side of the protective tube can be smoothly bent in a three-dimensional direction with respect to the mounting portion of one bridge girder, and the first inner ring and the first outer ring can be used as components. Therefore, simplification of the protective tube movable support structure can be promoted.

  According to a third characteristic configuration of the present invention, the second movable support means includes a second inner ring having a partially spherical outer peripheral surface, and a three-dimensional direction along the partial spherical outer peripheral surface of the second inner ring. And a second outer ring having a partially spherical inner peripheral surface that is slidable on the outer surface, and the second inner ring is externally slidably provided in the tube axis direction on the other side of the protective tube. In addition, the second outer ring is fixed to the attachment portion of the other bridge girder.

  According to the above configuration, the second outer side fixed to the part spherical outer peripheral surface of the second inner ring and the other bridge girder mounting portion which is slidably mounted on the other side of the protective tube in the direction of the tube axis. By sliding with the partial spherical inner peripheral surface of the ring, the other side portion of the protective tube can be smoothly bent and expanded in the three-dimensional direction with respect to the mounting portion of the other bridge girder, and also as a component member Since it is only necessary to prepare the second inner ring and the second outer ring, simplification of the protective tube movable support structure can be promoted.

  According to a fourth feature of the present invention, the first outer ring and the first inner ring slide relative to each other on the partial spherical inner peripheral surface of the first outer ring or the partial spherical outer peripheral surface of the first inner ring. 1st sliding resistance provision means which provides resistance to is in the point provided.

  According to the above configuration, the first outer ring and the first inner ring are provided by the first sliding resistance applying means provided on the partial spherical inner peripheral surface of the first outer ring or the partial spherical outer peripheral surface of the first inner ring. It is possible to give resistance to the relative sliding of the bridge girder, while smoothly following the displacement of both bridge girders caused by an earthquake etc. Inadvertent bending operation can be suppressed to improve the efficiency of assembly work.

  According to a fifth feature of the present invention, the second outer ring and the second inner ring slide relative to each other on the partial spherical inner peripheral surface of the second outer ring or the partial spherical outer peripheral surface of the second inner ring. The second sliding resistance applying means for applying resistance is provided.

  According to the above configuration, the second outer ring and the second inner ring are provided by the second sliding resistance applying means provided on the partial spherical inner peripheral surface of the second outer ring or the partial spherical outer peripheral surface of the second inner ring. It is possible to provide resistance to relative sliding with the other bridge girder, while smoothly following the displacement of both bridge girders caused by earthquakes etc. Inadvertent bending operation can be suppressed to improve the efficiency of assembly work.

  According to a sixth feature of the present invention, the second inner ring is provided with third sliding resistance applying means for applying resistance to relative sliding in the tube axis direction between the second inner ring and the protective tube. It is in the point.

  According to the above configuration, the third sliding resistance imparting means provided on the second inner ring can impart resistance to relative sliding in the tube axis direction with the second inner ring. Smoothly follows the displacement of both bridge girders caused by the cable and securely extends and retracts, but suppresses inadvertent expansion and contraction when assembling the other bridge girder to the mounting part, thereby improving the efficiency of the assembling work. be able to.

  A seventh characteristic configuration according to the present invention is that a stopper capable of coming into contact with the second movable support means from the tube axis direction is provided at the other end portion of the protection tube in the tube axis direction.

  According to the above configuration, even when the second movable support means is slidably pre-assembled to the other end portion of the protective tube, the second movable support means is assembled when the other bridge girder is assembled to the attachment portion. Can be prevented from coming off from the other end of the protective tube by contact with the stopper.

  According to an eighth feature of the present invention, there is provided a flexible first cord-like body connecting one end of the protective tube in the tube axis direction and one bridge girder, or the other end of the protective tube in the tube axis direction and the other. This is in that at least one of the flexible second cords connecting the bridge girder is provided.

  According to the above configuration, when the protective pipe is attached to the mounting portion of the both bridge girders, the drop-off of the protective pipe is connected to the flexible first cable-like body connected to one bridge girder and the other bridge girder. It is possible to reliably prevent at least one of the flexible second cords formed.

The side view of the protection pipe movable support structure of the bridge which shows 1st Embodiment of this invention Enlarged cross-sectional view of the movable support structure for bridge protection pipe Fig. 1 III-III enlarged view Top view of the first mounting part of the bridge girder Exploded half sectional view of protective tube and first movable support means Exploded half sectional view of protective tube and second movable support means Enlarged sectional view of the protective tube movable support structure when the bridge girder is displaced The expanded sectional view of the 1st movable support means which shows a 2nd embodiment of the present invention. The expanded sectional view of the 2nd movable support means which shows a 3rd embodiment of the present invention.

[First Embodiment]
FIG. 1 shows a bridge on a bridge pier A in which both bridge girders B adjacent via a girder gap S are supported so as to be displaceable in a bridge axis direction and a direction perpendicular to the bridge axis via a seismic isolation bearing C. The bridge girder B is provided with a cable rack 2 in which cables 1 such as an optical fiber cable, a power cable, a telephone line and the like are provided, and the anticorrosion-coated steel pipe through which the cables 1 are inserted between the bridge girder B. A protective tube 3 made of metal such as is erected.

  As shown in FIG. 2 to FIG. 7, the bridge protection tube movable support structure for supporting the protection tube 3 so that it can expand and contract and bend is provided at the first mounting portion 4 of one bridge girder B with the tube axis of the protection tube 3. The first movable support means D that supports the one side portion in the direction of bending in the three-dimensional direction in a state in which relative movement in the tube axis direction is prevented, and the second attachment portion 5 of the other bridge girder B includes: A second movable support means E is provided to support the other side portion of the protective tube 3 in the tube axis direction so as to be able to bend in the three-dimensional direction while allowing relative movement in the tube axis direction.

  The first mounting portion 4 and the second mounting portion 5 of the bridge girder B are configured in the same structure. Specifically, as shown in FIGS. A support member 9 made of an equilateral angle steel (angle material) is attached to each of the brackets 8 fixed along the peripheral portions of the upper and lower long sides of the peripheral portion of the rectangular through hole 7 with bolts 10 and nuts. 11, and the first outer ring 16 of the first movable support means D or the second outer ring 21 of the second movable support means E can be selectively attached across the support members 9. A plurality of support plates 12 (three in the present embodiment) in which a plurality of circular mounting holes 12a are formed in the vertical direction (two in the present embodiment) are juxtaposed at predetermined intervals in the bridge width direction. In this state, the bolt 10 and the nut 11 are attached.

  As shown in FIGS. 2, 5, and 7, the first movable support means D includes a stainless steel first inner ring 15 having a partially spherical outer peripheral surface 15 a, and the first inner ring 15. A first outer ring 16 made of stainless steel having a partial spherical inner peripheral surface 16a slidable in a three-dimensional direction along the partial spherical outer peripheral surface 15a. Is composed of first divided outer ring bodies 16A and 16B which are divided into two in the tube axis direction at the position of the maximum inner diameter of the partial spherical inner peripheral surface 16a.

  A first fitting mounting groove 17 that can be fitted to a peripheral portion of the mounting hole 12a of the support plate 12 is provided at a portion corresponding to the ring dividing surface on the outer peripheral surface of the first divided outer ring bodies 16A and 16B. And the first outer ring 16 is connected to one bridge beam B by tightening and fixing the first divided outer ring bodies 16A, 16B from the tube axis direction. A bolt 10 and a nut 11 that are fixed to the first mounting portion 4 are provided.

  Therefore, the groove forming surfaces 16b of the first divided outer ring bodies 16A and 16B constituting the first fitting mounting groove 17 are applied to the peripheral portion of the mounting hole 12a of the support plate 12 from both sides in the tube axis direction. In this state, the first divided outer ring bodies 16A and 16B are fastened and fixed with bolts 10 and nuts 11, so that the mounting holes 12a of the support plate 12 are formed on the groove forming surfaces 16b of the first divided outer ring bodies 16A and 16B. Hold and fix the peripheral part of.

  The first split outer ring bodies 16A and 16B are provided with resistance to relative sliding between the first outer ring 16 and the first inner ring 15 at locations corresponding to the ring split surfaces on the partial spherical inner peripheral surface 16a. As an example of one sliding resistance applying means, a first elastic resistance applying body 18 made of rubber is attached so as to be slidably contacted with the partial spherical outer peripheral surface 15a of the first inner ring 15 to provide frictional resistance. A first mounting groove 19 is formed.

  The first elastic resistance imparting body 18 mounted in the first mounting groove 19 of the first divided outer ring bodies 16A and 16B is fastened and fixed to the first divided outer ring bodies 16A and 16B with bolts 10 and nuts 11. It is held and fixed as you go.

  On the inner peripheral surface of the first inner ring 15, a female screw portion 15 b that can be screwed into the first male screw portion 3 a formed at one end of the outer peripheral surface of the protective tube 3 is formed. The first inner ring 15 is fixed to one end of the protective tube 3 by screwing the female screw portion 15b and the first male screw portion 3a of the protective tube 3 with an adhesive applied thereto.

  As shown in FIGS. 2, 6, and 7, the second movable support means E includes a second inner ring 20 made of stainless steel having a partially spherical outer peripheral surface 20 a and a second inner ring 20. A second outer ring 21 made of stainless steel having a partial spherical inner peripheral surface 21a slidable in a three-dimensional direction along the partial spherical outer peripheral surface 20a. Is composed of second divided outer ring bodies 21A and 21B which are divided into two in the tube axis direction at the maximum inner diameter position of the partial spherical inner peripheral surface 21a.

  A second fitting mounting groove 22 that can be fitted to the peripheral portion of the mounting hole 12a of the support plate 12 is provided at a portion corresponding to the ring dividing surface on the outer peripheral surface of the second divided outer ring bodies 21A and 21B. And the second outer ring 21 is connected to the other bridge beam B by tightening and fixing the second divided outer ring bodies 21A and 21B from the tube axis direction. A bolt 10 and a nut 11 that are fixed to the second mounting portion 5 are provided.

  Therefore, the groove forming surfaces 21b of the second divided outer ring bodies 21A and 21B constituting the second fitting attachment groove 22 are applied to the peripheral portion of the attachment hole 12a of the support plate 12 from both sides in the tube axis direction. In this state, the second divided outer ring bodies 21A and 21B are fastened and fixed with bolts 10 and nuts 11, whereby the mounting holes 12a of the support plate 12 are formed on the groove forming surfaces 21b of the second divided outer ring bodies 21A and 21B. Hold and fix the peripheral part of.

  The second split outer ring bodies 21A and 21B have a portion corresponding to the ring split surface on the partial spherical inner peripheral surface 21a, and a resistance is given to relative sliding between the second outer ring 21 and the second inner ring 20. 2 is an example of a sliding resistance applying means, and a second elastic resistance applying body 23 made of rubber is attached to the partial spherical outer peripheral surface 20a of the second inner ring 20 so as to be slidable and apply a frictional resistance. A second mounting groove 24 is formed.

  The second elastic resistance imparting body 23 mounted in the second mounting groove 24 of the second divided outer ring bodies 21A and 21B is fastened and fixed to the first divided outer ring bodies 16A and 16B with bolts 10 and nuts 11. It is held and fixed as you go.

  The inner peripheral surface 20b of the second inner ring 20 is formed as a sliding guide surface that has an inner diameter slightly larger than the outer diameter of the protective tube 3 and is slidable along the outer peripheral surface of the protective tube 3. 2 The third sliding resistance that provides resistance to the relative sliding in the tube axis direction between the second inner ring 20 and the protective tube 3 at the center position in the tube axis direction of the inner peripheral surface 20b of the inner ring 20. As an example of the applying means, a third mounting groove 26 is formed for mounting a rubber-made third elastic resistance applying body 25 that is slidably contacted with the outer peripheral surface of the protective tube 3 to provide a frictional resistance. ing.

At the other end of the protective tube 3 in the tube axis direction, a stopper 27 is provided that can come into contact with the second inner ring 20 of the second movable support means E from the tube axis direction.
On the inner peripheral surface of the stopper 27, a female screw portion 27a that can be screwed into the second male screw portion 3b formed at the other end of the outer peripheral surface of the protective tube 3 is formed. The female screw portion 27a of the stopper 27 is formed. The stopper 27 is fixed to the other end of the protective tube 3 by screwing the second male screw portion 3b of the protective tube 3 with the adhesive applied.

  A flexible first cord-like body 28 connecting one end of the protective tube 3 in the tube axis direction and the first mounting portion 4 of one bridge beam B, and the other end of the protective tube 3 in the tube axis direction A flexible second cord-like body 29 that connects the second mounting portion 5 of the other bridge girder B is provided.

  The first cord-like body 28 is an engagement of the eye nut 11 that constitutes one of the nuts 11 to which the cable support rod 30 and the support plate 12 of the first mounting portion 4 are attached to one end of the protective tube 3 in a transverse state. It consists of a stainless steel chain connected over the stop ring 11A.

  The second cord-like body 29 is formed of an eye nut 11 that constitutes one of the nuts 11 for attaching the cable support rod 31 and the support plate 12 of the second attachment portion 5 that are installed in a transverse state to the other end of the protective tube 3. It is composed of a stainless steel chain connected to the locking ring 11A.

  As shown in FIG. 7, even if both bridge girders B adjacent via the girder gap S are displaced in a three-dimensional direction (bridge axis direction and a direction perpendicular to the bridge axis) due to an earthquake or the like, one bridge girder B Bending operation in the three-dimensional direction at one side of the protective tube 3 with respect to the first movable support means D provided at the first mounting portion 4 and the second movable support provided at the second mounting portion 5 of the other bridge girder B The disposition distance and disposition direction of the cables 1 due to the relative displacement between the bridge beams B by the relative movement in the tube axis direction at the other side of the protective tube 3 with respect to the means E and the bending operation in the three-dimensional direction. Can absorb the fluctuations.

  Moreover, one side portion of the protective tube 3 and the first movable support means D can be bent only relative to each other, and the other side portion of the protective tube 3 and the second movable support means E can be expanded and contracted and bent. Therefore, many areas on the other side of the protective tube 3 excluding the attachment area for the first movable support means D can be used as the expansion / contraction operation area for the second movable support means E.

[Second Embodiment]
In the first embodiment described above, the partial spherical inner peripheral surface 16a of the first divided outer ring bodies 16A and 16B is pressed against the partial spherical outer peripheral surface 15a of the first inner ring 15 in a slidable state. The first mounting groove 19 for mounting the first elastic resistance imparting body 18 that imparts frictional resistance is formed, as shown in FIG. 8, on the partial spherical outer peripheral surface 15a of the first inner ring 15, A first mounting groove 19 for mounting the first elastic resistance imparting body 18 that presses the partial spherical inner peripheral surface 16a of both the first divided outer ring bodies 16A and 16B in a slidable state to impart frictional resistance. May be formed.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
In the first embodiment described above, the partial spherical inner peripheral surface 21a of both the second divided outer ring bodies 21A and 21B is pressed against the partial spherical outer peripheral surface 20a of the second inner ring 20 in a slidable state. The second mounting groove 24 for mounting the second elastic resistance imparting body 23 that imparts frictional resistance is formed, as shown in FIG. 9, on the partial spherical outer peripheral surface 20a of the second inner ring 20, A second mounting groove 24 for mounting a second elastic resistance imparting body 23 that presses the partial spherical inner peripheral surface 21a of both second divided outer ring bodies 21A and 21B in a slidable state to impart frictional resistance. May be formed.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In the first embodiment described above, the first movable support means D is arranged on the first inner ring 15 having the partial spherical outer peripheral surface 15 a and the partial spherical outer peripheral surface 15 a of the first inner ring 15. The first outer ring 16 is provided with a partial spherical inner peripheral surface 16a that can slide in a three-dimensional direction along the first outer ring 16 as the first movable support means D. 4. Any structure as long as one side of the protective tube 3 in the tube axis direction can be supported to be bent in the three-dimensional direction in a state in which relative movement in the tube axis direction is prevented. May be used.

  (2) In the first embodiment described above, the second movable support means E is arranged on the second inner ring 20 having the partial spherical outer peripheral surface 20 a and the partial spherical outer peripheral surface 20 a of the second inner ring 20. The second outer ring 21 having a partially spherical inner peripheral surface 21a slidable in a three-dimensional direction along the second outer ring 21 is used as the second movable support means E. 5. Any structure as long as it can support the other side portion of the protective tube 3 in the tube axis direction with respect to 5 so as to be able to bend in the three-dimensional direction while allowing relative movement in the tube axis direction. May be used.

(3) In the first embodiment described above, the first elastic resistance applying body 18 of the first sliding resistance applying means, the second elastic resistance applying body 23 of the second sliding resistance applying means, and the third sliding resistance applying. The third elastic resistance imparting body 25 of the means is made of rubber, but may be made of a leaf spring or the like.
Further, adjusting means for adjusting the sliding resistance applied by the first sliding resistance applying means 18, the second sliding resistance applying means 23, and the third sliding resistance applying means 25 may be provided.

B Bridge girder D 1st movable support means E 2nd movable support means S Girder gap 1 Cables 3 Protective tube 4 Attachment part (1st attachment part)
5 Mounting part (second mounting part)
15 1st inner ring 15a Partial spherical outer peripheral surface 16 1st outer ring 16a Partial spherical inner peripheral surface 18 1st sliding resistance provision means (1st elastic resistance provision body)
20 Second inner ring 20a Partial spherical outer peripheral surface 21 Second outer ring 21a Partial spherical inner peripheral surface 23 Second sliding resistance applying means (second elastic resistance applying body)
25 3rd sliding resistance provision means (3rd elastic resistance provision body)
27 Stopper 28 First cord-like body 29 Second cord-like body

Claims (8)

A bridge protection tube movable support structure for supporting a protection tube of cables arranged between both adjacent bridge girders via a girder gap so as to be extendable and bendable,
A first movable support means for supporting one side portion of the protective tube in the tube axis direction in a state where the relative movement in the tube axis direction is prevented so as to be able to be bent in a three-dimensional direction is provided on the attachment portion of one bridge girder, The second bridge girder is provided with second movable support means for supporting the other side portion of the protective tube in the tube axis direction so as to be able to bend in the three-dimensional direction while allowing relative movement in the tube axis direction. A protection tube movable support structure of a bridge.   The first movable support means includes a first inner ring having a partial spherical outer peripheral surface, and a partial spherical inner surface slidable in a three-dimensional direction along the partial spherical outer peripheral surface of the first inner ring. A first outer ring having a peripheral surface, wherein the first inner ring is fixed to one side of the protective tube, and the first outer ring is fixed to a mounting portion of one bridge girder. The bridge support tube movable support structure according to claim 1.   The second movable support means includes a second inner ring having a partial spherical outer peripheral surface, and a partial spherical inner surface that can slide in a three-dimensional direction along the partial spherical outer peripheral surface of the second inner ring. A second outer ring having a peripheral surface, and the second inner ring is externally slidably mounted on the other side of the protective tube in the direction of the tube axis, and the second outer ring The bridge protective tube movable support structure according to claim 1 or 2, wherein the bridge protective pipe movable support structure is fixed to a mounting portion of the bridge girder.   A first sliding resistance that provides resistance to relative sliding between the first outer ring and the first inner ring on the partial spherical inner peripheral surface of the first outer ring or the partial spherical outer peripheral surface of the first inner ring. The bridge protective tube movable support structure according to claim 2, further comprising an applying means.   A second sliding resistance that provides resistance to relative sliding between the second outer ring and the second inner ring on the partial spherical inner peripheral surface of the second outer ring or the partial spherical outer peripheral surface of the second inner ring. The bridge protective tube movable support structure according to claim 3, wherein an imparting means is provided.   6. The third inner ring is provided with third sliding resistance applying means for applying resistance to relative sliding between the second inner ring and the protective tube in the tube axis direction. Protective tube movable support structure for bridges.   The bridge according to any one of claims 1 to 6, wherein a stopper capable of coming into contact with the second movable support means from the tube axis direction is provided at the other end portion in the tube axis direction of the protective tube. Protective tube movable support structure.   A first flexible cord that connects one end of the protective tube in the axial direction of the tube and one bridge girder, or a flexible first link that connects the other end of the protective tube in the axial direction of the tube and the other bridge girder. The bridge protection pipe movable support structure according to any one of claims 1 to 7, wherein at least one of the two cord-like bodies is provided.

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