JP2019015145A - Uneven force cancellation structure - Google Patents

Abstract

To provide an uneven force cancellation for a water pipe bridge in which an uneven force is generated with a simple structure.SOLUTION: It is provided with a water pipe bridge 12 which is formed of a water pipe 16 extended between opposing support parts 50, 60, and a cable 14 installed along the water pipe bridge 12. At least one of the opposing support parts 50, 60 is a structure having at least one of concrete or steel. An end of the water pipe bridge 12 is fixed to the structure 50, and an end of the cable 14 is anchored to the structure 50. The water pipe bridge 12 has a bent part 16A at the end which is fixed to the structure 50 where an uneven force is generated. A tension is introduced into the cable 14 so that the tension of the cable 14 acts on the bent part 16A of the water pipe bridge 12 via the structure 50 to cancel the uneven force.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-average force canceling structure, and in particular, to a non-average force canceling structure in a water pipe bridge having a bent portion where non-average force is generated.

  When the water pipe has a bent portion, an unbalanced force generated by water pressure acts on the bent portion.

This non-average force is a considerably large force when the diameter of the water pipe is large and the water pressure is large. For example, when the diameter of the water pipe is 1000 mm, the water pressure (internal pressure) is 10 kg / cm ² , and the bent portion is bent at a right angle, a non-average force of about 75 tons acts on the bent portion.

  FIG. 10 is a side view schematically showing one end of a water pipe bridge 100 which is an example of a water pipe bridge formed of a water pipe having a bent portion. The water pipe bridge 100 is formed by bridging a water pipe 102 having a bent portion 102 </ b> A in which an unbalanced force is generated between opposing abutments 104. At one end portion of the water pipe bridge 100 shown in FIG. 10, a non-average force F acts on the bent portion 102 </ b> A in the horizontal direction, and a tipping moment M based on the non-average force F is applied to the abutment 104. In order to ensure stability against the overturning moment M, it may be necessary to increase the weight of the abutment 104, widen the bottom surface of the abutment 104, or use a pile foundation for the abutment 104.

  On the other hand, Patent Document 1 describes a method of dealing with a non-average force by using an expandable joint disposed in the ground.

  The expandable joint described in Patent Document 1 seems to cope with unbalanced force by a skillful structure, but its structure is so precise that it is stable over a long period against large unbalanced force. Concerns remain whether it can function. Moreover, since the structure is fine, the cost may increase.

Japanese Patent Laid-Open No. 11-30376

  The present invention has been made in view of such points, and it is an object of the present invention to provide a non-average force canceling structure capable of canceling the non-average force with a simple structure in a water pipe bridge in which the non-average force is generated. To do.

  The present invention solves the above problem by the following non-average force canceling structure.

  That is, the first aspect of the non-average force canceling structure according to the present invention includes a water pipe bridge formed by piercing a water pipe between opposing support portions, a cable laid along the water pipe bridge, And at least one of the opposed support portions is a structure having at least one of concrete and steel, and one end of the water pipe bridge is fixed to the structure. And one end of the cable is fixed to the structure, and the water pipe bridge has a bent portion that generates an unbalanced force at the one end fixed to the structure. A tension is introduced into the cable, and the tension of the cable acts on the bent portion of the water pipe bridge via the structure to cancel the average force. It is an offset structure.

  Here, “one end of the water pipe bridge is fixed to the structure” is not only the case where one end of the water pipe bridge is directly fixed by being embedded in the structure, but also of the water pipe bridge. It is a concept including the case where one end is indirectly fixed to the structure via another member. Further, in the present application, “fixed” means that all displacements of horizontal, vertical, and rotation are constrained.

  In addition, “the tension of the cable acts on the bent portion of the water pipe bridge via the structure” means that only when the tension of the cable acts on the bent portion only through the structure. It is a concept including the case where it acts on the said bending part via another member in addition to the said structure.

  Further, in the present application, “cancelling the non-average force” is a concept including not only the case where the non-average force is completely canceled but also the case where at least a part of the non-average force is canceled.

  The bent portion of the water pipe bridge may be embedded in the structure.

  A second aspect of the non-average force canceling structure according to the present invention includes: a water pipe bridge formed by piercing a water pipe between opposing support parts; and a cable laid along the water pipe bridge. Each of the supporting parts facing each other is a structure having at least one of concrete and steel, and one end of the water pipe bridge is fixed to one of the structures. The other end of the water pipe bridge is fixed to the other of the structures, and one end of the cable is fixed to one of the structures, and the other end of the cable is the structure. Fixed to the other of the objects, and the water pipe bridge has bent portions where non-average forces are generated at the one end and the other end, respectively, while tension is introduced into the cable. The tension of the cable is the structure The non-average force canceling structure is characterized in that the non-average force generated in each of the bent portions is canceled by acting on the bent portions of the one end and the other end of the water pipe bridge via .

  Here, “one end of the water pipe bridge is fixed to one of the structures” means that one end of the water pipe bridge is fixed directly, for example, by being embedded in one of the structures. It is a concept including not only the case but also the case where one end of the water pipe bridge is indirectly fixed to one of the structures via another member. In addition, “the other end of the water pipe bridge is fixed to the other of the structures” means that the other end of the water pipe bridge is directly fixed by being embedded in the other of the structures. It is a concept including not only the case where the other end of the water pipe bridge is fixed to the other of the structures indirectly via another member.

  In addition, “the tension of the cable acts on the bent portion at the one end and the other end of the water pipe bridge via the structure” means that the tension of the cable is only through the structure. The concept includes not only the case of acting on each of the bent portions, but also the case of acting on the bent portions via another member in addition to the structure.

  The bent portion at the one end of the water pipe bridge may be embedded in one of the structures, and the bent portion at the other end of the water pipe bridge is the other of the structures. It may be embedded inside.

  The structure is, for example, an abutment.

  In the non-average force canceling structure, the number of the cables is one or more, and at least one of the cables is located above a lower end portion of a branch portion of the water pipe bridge, and the water pipe bridge A connecting member is attached to the at least one cable located above the lower end of the interstitial portion, and at least a part of the interstitial portion is lifted by the connecting member. You may comprise.

  Here, “above the lower end portion of the branch portion of the water pipe bridge” is not only located just above the water pipe bridge, but also not just above the water pipe bridge, for example, the water pipe bridge Even if it is located on the side of the water pipe, it is a concept including that case as long as the height position is located above the lower end portion of the branch portion of the water pipe bridge.

  According to the present invention, the non-average force can be canceled out with a simple structure in the water pipe bridge in which the non-average force is generated.

The side view which shows typically the non-average force cancellation structure which concerns on 1st Embodiment of this invention. II-II sectional view of FIG. FIG. 1 is an enlarged side view showing a portion III in FIG. The side view which shows typically the non-average force cancellation structure which concerns on 2nd Embodiment of this invention. VV line sectional view of FIG. Side view showing fixing mode 28 The side view which shows typically the non-average force cancellation structure which concerns on 3rd Embodiment of this invention. VIII-VIII line sectional view of FIG. The enlarged side view which expands and shows the IX part of FIG. The side view which shows typically the one end part of the water pipe bridge 100 which is an example of the water pipe bridge formed with the water flow pipe which has a bending part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment FIG. 1 is a side view schematically showing a non-mean force canceling structure according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is an enlarged side view showing a portion III of FIG. 1 in an enlarged manner.

  The non-average force canceling structure 10 according to the first embodiment includes a water pipe bridge 12 and a cable 14, and the water pipe bridge 12 has a water pipe 16 between an abutment 50 and a masonry retaining wall 60 facing each other. Is formed over the bridge. Accordingly, the water pipe bridge 12 is the water pipe 16 in a state of being bridged between the opposed abutment 50 and the masonry retaining wall 60, and the bent portion 16 </ b> A of the water pipe 16 is connected to the bent portion of the water pipe bridge 12. I can also say.

  The water pipe 16 of the water pipe bridge 12 has an end on the abutment 50 side embedded in the abutment 50 from an upper end front face 50 </ b> A of the abutment 50, and is fixed to the abutment 50. The abutment 50 is made of concrete. The water pipe 16 embedded in the abutment 50 from the upper end front surface portion 50A of the abutment 50 is turned downward at the bent portion 16A. For this reason, in the bending part 16A, the non-average force F1 is generated in the horizontal direction (the direction from right to left in FIG. 1).

  Further, the water pipe 16 is movably supported (movably supported in the length direction of the water pipe 16) by a movable support 52 installed on the upper surface of the front end portion 50 </ b> B of the abutment 50. Further, the water conduit 16 includes an extendable tube 16 </ b> B between the upper end front surface portion 50 </ b> A of the abutment 50 and the movable support 52. The expansion tube 16B absorbs expansion and contraction of the water flow tube 16 due to a temperature change or the like.

  The end of the water pipe 16 of the water pipe bridge 12 on the side of the masonry retaining wall 60 is embedded in the masonry retaining wall 60 in a straight and horizontal manner.

  As shown in FIGS. 1 and 2, two cables 14 are installed in parallel on the upper part of the water pipe bridge 12 along the horizontal direction in which the water pipe bridge 12 extends. The end of the cable 14 on the abutment 50 side is fixed by the upper end rear surface portion 50 </ b> C of the abutment 50. The end of the cable 14 on the side of the masonry retaining wall 60 is fixed to a fixing bracket 16 </ b> C attached to the outer peripheral surface of the water conduit 16 by welding.

  FIG. 3 is an enlarged side view showing an enlarged end portion (III portion in FIG. 1) of the cable 14 on the abutment 50 side, and the fixing state of the cable 14 in the non-average force canceling structure 10 according to the first embodiment. 20 is shown. In FIG. 3, for convenience of illustration, members located inside the abutment 50 are also drawn with solid lines.

  The cable 14 is a PC steel wire, and an apartment 22 is attached to the end of the cable 14. The outer peripheral surface of the condominium 22 is threaded, and the condominium 22 is attached to the upper end rear surface portion 50C of the abutment 50 by the anchor plate 24 and the nut 26. The cable 14 includes the condominium 22, the anchor plate 24, and the nut. 26, the upper end rear surface portion 50 </ b> C of the abutment 50 is fixed.

  One end of the cable 14 is fixed on the upper end rear surface portion 50C of the abutment 50, and the other end of the cable 14 is fixed on a fixing bracket 16C attached to the outer peripheral surface of the water pipe 16 by welding. The tension is introduced into the. The tension introduced into the cable 14 acts as a force P1 in the horizontal direction (the direction from the left to the right in FIG. 1) from the fixing portion in the upper end rear surface portion 50C of the abutment 50 to the vicinity of the upper end portion of the abutment 50. The non-average force F1 generated in the 16 bent portions 16A is canceled out.

  For this reason, by using the non-average force canceling structure 10 according to the first embodiment, measures to cope with the non-average force F1 generated at the bent portion 16A of the water pipe 16 (such as increasing the weight of the abutment 50) It is not necessary to widen the bottom surface of the abutment 50 or use a pile foundation for the abutment 50), or it can be greatly simplified.

  As described above, the non-average force canceling structure 10 according to the first embodiment is a structure in which the tension of the cable 14 is applied to the upper end rear surface portion 50C of the abutment 50 to cancel the non-average force F1. Is a simple structure.

  The fixing bracket 16C has a horizontal direction (a direction from right to left in FIG. 1) as a reaction force of a force P1 that acts in the horizontal direction (a direction from left to right in FIG. 1) near the upper end of the abutment 50. ) Has a force P2.

(2) Second Embodiment FIG. 4 is a side view schematically showing a non-mean force canceling structure according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. .

  The non-average force canceling structure 30 according to the second embodiment includes a water pipe bridge 32 and a cable 34, and the water pipe bridge 32 includes a water pipe 36 between an abutment 70 and an abutment 80. Passed and formed. Therefore, the water pipe bridge 32 is the water pipe 36 in a state of being bridged between the abutment 70 and the abutment 80 facing each other, and the bent portions 36A and 36B of the water pipe 36 are connected to the bent portion of the water pipe bridge 32. I can also say.

  The water pipe 36 of the water pipe bridge 32 has an end on the abutment 70 side embedded in the abutment 70 from an upper end front face 70 </ b> A of the abutment 70, and is fixed to the abutment 70. The abutment 70 is made of concrete. The water pipe 36 embedded in the abutment 70 from the front end front portion 70A of the abutment 70 is turned downward at the bent portion 36A. For this reason, the non-average force F2 is generated in the horizontal direction (the direction from right to left in FIG. 4) in the bent portion 36A.

  Further, the water pipe 36 is movably supported (movably supported in the horizontal direction in which the water pipe bridge 32 extends) by a movable support 72 installed on the upper surface of the front end portion 70B of the abutment 70. Further, the water pipe 36 includes a telescopic pipe 36 </ b> C between the upper end front part 70 </ b> A of the abutment 70 and the movable support 72. The expansion / contraction tube 36C absorbs expansion / contraction of the water flow tube 36 due to a temperature change or the like.

  Further, the water pipe 36 of the water pipe bridge 32 is fixed to the abutment 80 with the end on the abutment 80 side being embedded in the abutment 80 from the upper front surface 80 </ b> A of the abutment 80. The abutment 80 is made of concrete. The water pipe 36 embedded in the abutment 80 from the upper end front surface portion 80A of the abutment 80 is turned downward at the bent portion 36B. For this reason, the non-average force F3 is generated in the horizontal direction (the direction from the left to the right in FIG. 4) in the bent portion 36B.

  Further, the water pipe 36 is movably supported (movably supported in the horizontal direction in which the water pipe bridge 32 extends) by a movable support 82 installed on the upper surface of the front end portion 80B of the abutment 80. Further, the water pipe 36 includes a telescopic pipe 36 </ b> D between the upper end front surface portion 80 </ b> A of the abutment 80 and the movable support 82. The expansion / contraction tube 36D absorbs expansion / contraction of the water flow tube 36 accompanying a temperature change or the like.

  As shown in FIGS. 4 and 5, two cables 34 are laid in parallel on the upper part of the water pipe bridge 32 along the horizontal direction in which the water pipe bridge 32 extends. The end of the cable 34 on the abutment 70 side is fixed by the upper end rear surface portion 70 </ b> C of the abutment 70. Further, the end of the cable 34 on the abutment 80 side is fixed by the upper end rear surface portion 80 </ b> C of the abutment 80.

  The fixing manner at the upper end rear surface portion 70C of the abutment 70 of the cable 34 and the fixing manner at the upper end rear surface portion 80C of the abutment 80 are the fixing manner 20 shown in FIG. 3 (the cable of the non-average force canceling structure 10 according to the first embodiment). 14 is the same as the fixing mode of the upper end rear surface portion 50C of the abutment 50, and the description thereof is omitted.

  One end of the cable 34 is fixed at the upper end rear surface portion 70C of the abutment 70, the other end of the cable 34 is fixed at the upper end rear surface portion 80C of the abutment 80, and tension is introduced into the cable 34. . The tension introduced into the cable 34 acts as a force P3 in the horizontal direction (the direction from the left to the right in FIG. 4) from the fixing portion of the upper end rear surface portion 70C of the abutment 70 to the vicinity of the upper end portion of the abutment 70. The non-average force F2 generated at the 36 bent portions 36A is canceled, and the force in the horizontal direction (the direction from right to left in FIG. 4) from the fixing portion at the upper end rear surface portion 80C of the abutment 80 to the vicinity of the upper end portion of the abutment 80. Acting as P4, the non-average force F3 generated at the bent portion 36B of the water conduit 36 is canceled.

  For this reason, by using the non-average force canceling structure 30 according to the second embodiment, measures to cope with the non-average force generated at the bent portions 36A and 36B of the water pipe 36 (the weight of the abutments 70 and 80 are reduced). Or increasing the bottom surface of the abutments 70, 80, or using a pile foundation for the abutments 70, 80) or greatly simplifying.

  Further, as described above, the non-average force canceling structure 30 according to the second embodiment causes the tension of the cable 34 to act on the upper end rear surface portion 70C of the abutment 70 and the upper end rear surface portion 80C of the abutment 80, thereby increasing the average force. This is a structure that cancels F2 and F3, and is a simple structure.

(3) Supplement on the first embodiment and the second embodiment The abutment 50 of the cable 14 of the non-average force canceling structure 10 according to the first embodiment and the cable 34 of the non-average force canceling structure 30 according to the second embodiment, The fixing to 70 and 80 is performed by using the fixing mode 20 (the fixing mode in which most of the fixing member is embedded in the abutment) as shown in FIG. Although fixing is performed at 50C, 70C, and 80C, the fixing mode of the cable 14 and the cable 34 to the abutments 50, 70, and 80 is not limited thereto, and other fixing modes may be used as long as sufficient fixing is possible. May be used.

  For example, in the non-average force canceling structure 10 according to the first embodiment, a cable fixing bracket 54 is attached to the upper end surface 50D of the abutment 50 with an anchor 56 as in the fixing mode 28 shown in FIG. One end of the cable 14 may be fixed to the fixing bracket 54. This fixing mode 28 is a fixing mode in which most of the fixing member is exposed to the outside of the abutment 50. In FIG. 6, the same members as those depicted in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted. Moreover, in FIG. 6, the member located inside the abutment 50 is also drawn with the continuous line for convenience of illustration.

  The cable fixing bracket 54 includes a bottom steel plate 54A, a pressure receiving steel plate 54B, and a reinforcing steel plate 54C, and is assembled by welding. As shown in FIG. 6, the bottom steel plate 54A is disposed on the upper end surface 50D of the abutment 50, and is attached to the upper end surface 50D of the abutment 50 with the anchor 56. Thus, the cable fixing bracket 54 is It is attached to the upper end surface 50D of the abutment 50.

  A pressure receiving steel plate 54B and a reinforcing steel plate 54C are attached to the upper surface of the bottom steel plate 54A by welding. The pressure-receiving steel plate 54B is a steel plate orthogonal to the cable 14 and has a through-hole through which the apartment 22 attached to the end of the cable 14 is inserted. The apartment 22 inserted through the through hole of the pressure receiving steel plate 54B is attached to the pressure receiving steel plate 54B by the anchor plate 24 and the nut 26.

  The reinforcing steel plate 54C is a steel plate arranged in parallel with the cable 14, and two sheets are arranged facing each other, and the apartment 22 is arranged between the two reinforcing steel sheets 54C facing each other. The reinforcing steel plate 54C transmits the tension of the cable 14 to the bottom steel plate 54A.

  The fixing mode 28 described above can also be employed in the non-average force canceling structure 30 according to the second embodiment.

  Further, in the non-average force canceling structure 10 according to the first embodiment, two cables 14 are used, and in the non-average force canceling structure 30 according to the second embodiment, two cables 34 are used. The number is not limited to two, but may be one or three or more. The number of cables 14 and 34 to be used can be determined appropriately according to the magnitude of the non-average force to be offset, the situation of the surrounding environment, and the like.

  Further, in the non-average force canceling structure 10 according to the first embodiment and the non-average force canceling structure 30 according to the second embodiment, the cables 14 and 34 are arranged at a height position above the water pipes 16 and 36. The relationship between the height positions of the cables 14, 34 and the water pipes 16, 36 is not particularly limited, and the height position of the cables 14, 34 may be lower than the height position of the water pipes 16, 36. The height of the water pipes 16 and 36 may be approximately the same.

  Moreover, although the cable 14 of the non-mean force canceling structure 10 according to the first embodiment and the cable 34 of the non-mean force canceling structure 30 according to the second embodiment are PC steel wires, the tension members used as the cables 14 and 34 are used. Is not particularly limited as long as it has the required performance, and for example, FRP rods using carbon fiber, aramid fiber, etc. can also be used if they have the required performance. .

  Further, in the non-average force canceling structure 10 according to the first embodiment, the water pipe 16 of the water bridge 12 is fixed to the abutment 50 with the end (bending portion 16 </ b> A) on the abutment 50 side being embedded in the abutment 50. However, the end of the water pipe 16 of the water pipe bridge 12 on the side of the abutment 50 (bending portion 16A) may be fixed to the abutment 50 without being embedded in the abutment 50. An end (bending portion 16A) of the water pipe 16 on the abutment 50 side is fixed to, for example, a fixed support that is sufficiently fixed to the abutment 50, and is fixed to the abutment 50 through the fixed support. An aspect may be sufficient.

  Further, in the non-average force canceling structure 30 according to the second embodiment, the water pipe 36 of the water pipe bridge 32 has one end portion (bending portion 36 </ b> A) embedded in the abutment 70 and fixed to the abutment 70. The end portion (bending portion 36B) is embedded in the abutment 80 and fixed to the abutment 80. However, the end portion of the water pipe 36 of the water pipe bridge 32 is fixed to the abutments 70 and 80. The one end portion (bending portion 36A) of the water pipe 36 of the water pipe bridge 32 may be fixed to a fixed support that is sufficiently fixed to the abutment 70, for example. The other end portion (bending portion 36B) of the water pipe 36 of the water pipe bridge 32 is fixed to a fixed support that is sufficiently fixed to the abutment 80, for example. Bridge through this fixed support It may be a fixed manner which is well fixed to 80.

  In the case where the water pipes 16 and 36 of the water pipe bridges 12 and 32 are fixed to the abutments 50, 70 and 80 via the fixed support, the tension introduced into the cables 14 and 34 is the same as that of the abutments 50, 70 and 80. Via the fixed support, it acts on the bent portions 16A, 36A, 36B of the water pipes 16, 36 of the water pipe bridges 12, 32, and cancels the non-average force generated at the bent portions 16A, 36A, 36B of the water pipes. .

  Further, in the non-average force canceling structure 10 according to the first embodiment and the non-average force canceling structure 30 according to the second embodiment, the water pipe 16 of the water pipe bridge 12 and the water pipe 36 of the water pipe bridge 32 are respectively concrete. In the present invention, the structure for fixing the water pipe of the water pipe bridge is not limited to the concrete structure, and the structure made of steel is fixed to the steel abutment 50 and the concrete abutments 70 and 80. It may be a thing. Moreover, the structure using both concrete and steel may be sufficient.

  Further, the length of the span between the water pipe bridges 12 and 32 to which the non-average force canceling structure 10 according to the first embodiment and the non-average force canceling structure 30 according to the second embodiment can be applied is the cable 14, If it can install 34, there will be no restriction | limiting in particular, When using PC steel wire as the cables 14 and 34, for example, it is applicable also with the span length of about 150 m.

(4) Third Embodiment FIG. 7 is a side view schematically showing a non-mean force canceling structure according to a third embodiment of the present invention, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. FIG. 9 is an enlarged side view in which the IX portion of FIG. 7 is enlarged.

  The non-mean force canceling structure 40 according to the third embodiment is an embodiment in which connecting members 48 for lifting the water pipes 36 are provided at six places (3 places × 2 rows) on the non-mean force canceling structure 30 according to the second embodiment. It is a form. In the description of the non-mean force canceling structure 40 according to the third embodiment, the same members as those of the non-mean force canceling structure 30 according to the second embodiment are used in principle with the same reference numerals, and the description thereof is omitted in principle.

  In the non-average force canceling structure 30 according to the second embodiment, the cable 34 cancels out the non-average force generated at the bent portions 36A and 36B of the water conduit 36, but the non-average force canceling structure 40 according to the third embodiment. The cable 44 used in FIG. 1 not only cancels out the non-average force generated at the bent portions 36A and 36B of the water pipe 36, but also lifts the water pipe bridge 42 (water pipe 36) via the connecting member 48, so that the water pipe bridge 42 Also plays the role of reducing the deflection.

  As shown in FIG. 7 and FIG. 8, two cables 44 are installed in parallel on the upper part of the water pipe bridge 42 along the horizontal direction in which the water pipe bridge 42 extends, and the connecting member 48 includes two parallel cables. 44 is attached to both.

  The connecting member 48 includes a turnbuckle 48A, a bracket 48B, and a movable connecting member 48C.

  The turnbuckle 48A has a lower end attached to the bracket 48B, and a movable connecting member 48C attached to the upper end. The bracket 48B is attached to the outer peripheral surface of the water pipe 36 by welding.

  The movable connecting member 48 </ b> C includes a mechanism that allows movement along the cable 44, and can be attached to the cable 44 so as to be movable along the cable 44, but is disposed at a predetermined position. A position fixing mechanism is also provided so that the position can be fixed in stages.

  The connecting member 48 connects the cable 44 and the water pipe 36, and the cable 44 lifts the water pipe 36 upward via the connecting member 48, thereby reducing the deflection of the water pipe 36.

  The magnitude of the force with which the cable 44 lifts the water pipe 36 upward via the connecting member 48 can be adjusted by adjusting the length of the turnbuckle 48A.

  The arrangement pitch of the connecting members 48 is appropriately determined according to the total amount of the force that the cable 44 lifts the water pipe 36 upward via the connecting member 48 and the lifting force that can be borne by one connecting member 48. Specifically, for example, a standard pitch of about 5 m is standard.

  In the non-average force canceling structure 40 according to the third embodiment, the cable 44 lifts the water pipe 36 upward via the connecting member 48 to reduce the deflection of the water pipe 36. Therefore, the third embodiment By using the non-average force canceling structure 40 according to the form, it is possible to eliminate or reduce the installation of a stiffener for reducing the deflection of the water pipe bridge 42. Although there is no restriction | limiting in particular in the span length of the water pipe bridge 42 which can apply the non-average force cancellation structure 40 concerning this 3rd Embodiment, As a span length of the water pipe bridge 42, about 10-30 m is standard.

  The height position of the cable 44 to which the connecting member 48 is attached is the height position X () of the lower end portion of the branch portion of the water pipe bridge 42 from the viewpoint of allowing the water pipe 36 to be lifted upward via the connecting member 48. (See FIG. 9). That is, in the non-average force canceling structure 40 according to the third embodiment, at least one of the cables 44 to be used has a height position higher than the height position X of the lower end portion of the branch portion of the water pipe bridge 42. The connecting member 48 is attached to the cable 44 at a position higher than the height position X of the lower end portion in the span portion of the water pipe bridge 42.

  The connecting member 48 can be used as long as it has a performance capable of lifting the water pipe 36 upward, and if it has the required performance, the connecting member 48 has a length adjusting function. Even if it is not provided, it can be used as the long member of the connecting member 48, and for example, round steel or PC steel wire can be used as the long member of the connecting member 48.

10, 30, 40 ... non-average force canceling structure 12, 32, 42 ... water pipe bridge 14, 34, 44 ... cable 16, 36 ... water pipe 16A, 36A, 36B ... bent portion 16B, 36C, 36D ... telescopic pipe 16C ... Fixing bracket 20, 28 ... Fixing mode 22 ... Apartment 24 ... Anchor plate 26 ... Nut 48 ... Connecting material 48A ... Turnbuckle 48B ... Bracket 48C ... Movable connecting member 50, 70, 80 ... Abutment 50A, 70A, 80A ... Front end of upper end 50B, 70B, 80B ... front end portion 50C, 70C, 80C ... upper end rear surface portion 50D ... upper end surface 52, 72, 82 ... movable support 54 ... bracket 54A ... bottom steel plate 54B ... pressure-receiving steel plate 54C ... reinforcing steel plate 56 ... anchor 60 ... masonry Retaining wall F, F1, F2, F3 ... Non-average force M ... Falling moment P1, P2, P3 P4 ... height position of the bottom end of the span portion of the force X ... water pipe bridge 42

Claims (6)

A water pipe bridge formed by piercing a water pipe between opposing support parts;
A cable erected along the water pipe bridge;
With
At least one of the opposing support portions is a structure having at least one of concrete and steel,
One end of the water pipe bridge is fixed to the structure, and one end of the cable is fixed to the structure;
While the water pipe bridge has a bent portion where an unbalanced force is generated at the one end fixed to the structure,
A tension is introduced into the cable, and the tension of the cable acts on the bent portion of the water pipe bridge via the structure to cancel the average force. Construction.   The non-average force canceling structure according to claim 1, wherein the bent portion of the water pipe bridge is embedded in the structure. A water pipe bridge formed by piercing a water pipe between opposing support parts;
A cable erected along the water pipe bridge;
With
Both of the opposing support portions are structures having at least one of concrete and steel,
One end of the water pipe bridge is fixed to one of the structures, the other end of the water pipe bridge is fixed to the other of the structures, and one end of the cable is connected to the structure. Fixed to one of them, the other end of the cable is fixed to the other of the structures,
While each of the water pipe bridges has bent portions where non-average forces are generated at the one end and the other end,
A tension is introduced into the cable, and the tension of the cable acts on the bent portion at the one end and the other end of the water pipe bridge via the structure, and is generated at each bent portion. The non-average force canceling structure is characterized by canceling the non-average force.   The bent portion at the one end of the water pipe bridge is embedded in one of the structures, and the bent portion at the other end of the water pipe bridge is in the other of the structures. The non-mean force canceling structure according to claim 3, wherein the non-mean force canceling structure is embedded.   The non-mean force canceling structure according to claim 1, wherein the structure is an abutment. The number of the cables is singular or plural,
At least one of the cables is located above the lower end of the branch portion of the water pipe bridge, and the at least one cable is located above the lower end of the branch portion of the water pipe bridge. Has a connecting material attached,
6. The non-average force canceling structure according to claim 1, wherein at least a part of a span portion of the water pipe bridge is lifted by the connecting member.

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