JP6491030B2 - Anchor cable fixing structure - Google Patents

Anchor cable fixing structure Download PDF

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JP6491030B2
JP6491030B2 JP2015088394A JP2015088394A JP6491030B2 JP 6491030 B2 JP6491030 B2 JP 6491030B2 JP 2015088394 A JP2015088394 A JP 2015088394A JP 2015088394 A JP2015088394 A JP 2015088394A JP 6491030 B2 JP6491030 B2 JP 6491030B2
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concrete
steel shell
steel
cable
bridge
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JP2016204996A (en
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裕生 篠崎
裕生 篠崎
浅井 洋
洋 浅井
諸橋 明
明 諸橋
昌晴 桑野
昌晴 桑野
喜彦 平
喜彦 平
春日 昭夫
昭夫 春日
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三井住友建設株式会社
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  The present invention relates to a structure for fixing an oblique cable that is formed on the upper part of a main tower of a cable-stayed bridge, which is one type of bridge, and that supports and supports a bridge girder.
  A cable-stayed bridge is one in which an oblique cable is stretched diagonally downward in the axial direction of the bridge girder (hereinafter referred to as the bridge axis direction) from the upper part of the main tower standing on the pier, and the bridge girder is suspended and supported by this cable is there. Many large cable-stayed bridges support bridge girders that extend from the main tower to both sides of the pier by extending multiple diagonal cables both in the longitudinal direction of the bridge. In such a cable-stayed bridge, cables from both sides in the bridge axis direction are fixed on the upper portion of the main tower, and a plurality of diagonal cables are arranged and fixed in the vertical direction. In particular, in the cable-stayed bridge, which is generally called the extradosed type, the height of the main tower is small and the distance between the cables in the vertical direction is small. It is fixed by. And the tensile force of the diagonal cable stretched on both sides of the main tower is transmitted to each other between the two diagonal cables, and the horizontal components of both are canceled. Therefore, there is a demand for a strong structure capable of reliably transmitting a large tensile force transmitted from the oblique cable stretched in both the bridge axis directions in the fixing portion of the oblique cable.
As a fixing structure of the oblique cable provided in the upper part of the main tower, there is one disclosed in Patent Document 1 or Patent Document 2, for example.
The fixing structure of the oblique cable described in Patent Document 1 includes a box-shaped steel member to which the oblique cable is fixed from both sides in the bridge axis direction, and the oblique cable stretched in both directions in the bridge axis direction by the steel member. The cable's tensile force is transmitted between each other.
  In the fixing structure of the oblique cable described in Patent Document 2, two steel side plates are arranged in the bridge axis direction, and a concrete member is formed so as to wind around these. The oblique cable stretched in both directions in the bridge axis direction is fixed to the concrete member through a positioning plate made of steel between the two steel side plates. Then, the horizontal component of the tensile force of the oblique cable stretched on both sides is transmitted from the concrete member to the steel side plate integrated by the displacement preventing member, and is canceled between the two oblique cables. ing.
JP 2002-348813 A JP 2007-51432 A
In the fixing structure of the oblique cable described in Patent Document 1, a steel member having a box shape is used in a portion where the oblique cable is fixed, and high rigidity is required to suppress deformation of these steel members. It becomes. For this reason, while the weight of steel materials becomes large, many processes, such as welding, are needed for formation of a steel member.
Further, in the fixing structure of the oblique cable described in Patent Document 2, the oblique cable is fixed to the concrete member, and a tensile force is applied from the concrete member to the steel side plate via a stud gibber provided on the outer surface of the two steel side plates. Is to be transmitted. For this reason, a lot of labor is required for processing for providing with a stud gibber. Moreover, the dimension of a concrete member becomes large and it is necessary to arrange | position many reinforcing bars in order to reinforce a concrete member.
  The present invention has been made in view of the above-described problems, and its purpose is to obtain the horizontal component of the tensile force transmitted from the oblique cable stretched in both directions in the bridge axis direction to the main tower. It is an object of the present invention to provide an oblique cable fixing structure which can be smoothly transmitted and canceled between cables and can be easily constructed.
In order to solve the above-mentioned problem, the invention according to claim 1 is stretched from the upper part of the main tower of the cable-stayed bridge diagonally below one side and the other side in the axial direction of the bridge girder (hereinafter referred to as the bridge axis direction). A slant cable fixing structure for fixing a plurality of slant cables for suspending and supporting the bridge girder to the upper part of the main tower, the plate surface being arranged in the bridge axis direction, and a direction perpendicular to the axis line of the bridge girder (hereinafter referred to as the bridge girder axis) The two connecting portion steel plates arranged to face each other with a gap in the direction perpendicular to the bridge axis) are joined to connect the edges in the bridge axis direction of these connecting portion steel plates and are smoothly curved. A steel shell having a curved section steel plate having a curved cross-section and a closed cross-section, and each of the steel shell in the vicinity of one end and the other end in the bridge axis direction inside the steel shell. No. 1 formed so as to be in close contact with the curved steel plate of the steel shell It has a concrete block and a second concrete blocks, the upper end portion of the swash cable penetrates the insertion hole provided in the bending portion steel sheet, on the one side in the bridge axis direction from the main tower top An upper end portion of a slant cable that is suspended and supports the bridge girder is fixed to the first concrete block, and a slant that is suspended from the upper part of the main tower to the other side in the bridge axis direction and supports the bridge girder. An oblique cable fixing structure in which an upper end portion of a cable is fixed to the second concrete block is provided.
  In this oblique cable fixing structure, the tensile force of the oblique cable is transmitted to the first concrete block and the second concrete block, respectively. And it is transmitted as a tensile force in the circumferential direction to the curved steel plate of the steel shell curved so as to be wound around each concrete block. The tensile force in the circumferential direction generated on the curved part steel plate is transmitted to the connecting part steel plate, and the tensile force of the oblique cable stretched from the main tower in both the bridge axis direction is mostly through the connecting part steel plate. Offset.
Thus, the horizontal component of the tensile force of the oblique cable is smoothly transmitted as the tensile force from the concrete block to the curved steel plate of the steel shell, so that the steel shell does not have to have a large bending rigidity. The amount of steel used for the shell is reduced. Moreover, it becomes possible to make the part which transmits the tension | tensile_strength of the diagonal cable stretched on both sides between each other with a simple shape and structure.
In addition, since the tensile force of the oblique cable is transmitted by the curved shape of the steel shell, it is possible to eliminate or reduce the detent provided between the steel plate and the concrete block. Labor is reduced.
  The invention according to claim 2 is the fixing structure of the oblique cable according to claim 1, wherein the outer concrete portion is in close contact with the outside of the steel shell, and the bridge shaft is perpendicular to both ends of the steel shell in the bridge axis direction. It is assumed that it has a horizontal tightening tension material that is arranged substantially horizontally and has both end portions fixed to the outer concrete portion in a state where tension force is introduced.
In this oblique cable fixing structure, the lateral fastening tension material exerts a compressive force in the direction perpendicular to the bridge axis on the outer concrete portion, and a force in the direction perpendicular to the bridge axis also acts on the curved steel plate of the steel shell. The curved part steel plate has a cross-sectional defect due to the insertion hole through which the oblique cable penetrates, but the tensile force acting on the curved part steel plate is reduced by the compressive force introduced by the lateral fastening tension material, and the curved part steel plate is reinforced. An effect is obtained.
Moreover, the steel shell is covered with the outer concrete portion that is in close contact with the steel shell to prevent corrosion of the steel shell, and the vertical concrete component of the tensile force of the oblique cable is transmitted to the lower part of the main tower and the pier by the outer concrete portion.
  The invention according to claim 3 is the fixing structure of the oblique cable according to claim 1, wherein the outer concrete portion that is in close contact with the outside of the steel shell, and is arranged substantially horizontally in the direction perpendicular to the bridge axis, and tension is introduced. In this state, both end portions are fixed to the outer concrete portion, and the horizontal tightening tension material is inserted into an opening provided in the steel shell, and inside the steel shell. It shall penetrate the inside of a certain 1st concrete block or a 2nd concrete block.
  In this oblique cable fixing structure, the outer concrete portion is strongly pressed against the steel shell and the steel shell is pressed against the inner concrete by the compressive force introduced by the lateral tension material. Thereby, a steel shell, a concrete block, and an outer side concrete part are integrated firmly.
  The invention according to claim 4 is the oblique cable fixing structure according to claim 2 or claim 3, wherein the first concrete block or the second concrete block is passed through a reinforcing bar insertion hole provided in the steel shell. It is assumed that continuous reinforcing bars are arranged in the outer concrete part.
  In this oblique cable fixing structure, the rebars are arranged continuously from the concrete block inside the steel shell to the outer concrete part, so that the integrity of the concrete block and the outer concrete part is improved.
  The invention according to claim 5 is the oblique cable fixing structure according to any one of claims 2 to 4, wherein the outer concrete portion is spaced from the outer peripheral surface of the steel shell on the outer side of the steel shell. It is assumed that the reinforcing bars in the circumferential direction are arranged so as to surround the outside of the steel shell.
  In this oblique cable fixing structure, a part of the tensile force generated in the circumferential direction of the steel shell by the tensile force of the oblique cable is borne by the reinforcing bars arranged outside the steel shell. Therefore, the steel shell is reinforced and the load acting in the circumferential direction of the steel shell is reduced.
  As described above, in the fixing structure of the oblique cable according to the present invention, the horizontal component of the tensile force acting on the main tower by the oblique cable stretched in both the bridge axis direction from the main tower is obtained. It is possible to smoothly transmit and cancel each other, and it is possible to easily construct the oblique cable fixing portion.
It is a schematic side view which shows the extradosed type cable-stayed bridge which can employ | adopt suitably the fixing structure of the diagonal cable which is embodiment of this invention. FIG. 2 is an elevational sectional view showing a fixing structure of an oblique cable applied to the main tower of the cable-stayed bridge shown in FIG. 1 according to the first embodiment of the present invention. FIG. 3 is a cross-sectional plan view of the oblique cable fixing structure shown in FIG. 2. FIG. 5 is a cross-sectional plan view showing a modification of the fixing structure of the oblique cable shown in FIG. It is a sectional elevation which shows the fixation structure of the diagonal cable which is the 2nd Embodiment of this invention. FIG. 6 is a cross-sectional plan view of the oblique cable fixing structure shown in FIG. 5. It is an elevation sectional view showing a fixing structure of a slant cable which is a 3rd embodiment of the present invention. It is a plane sectional view of the fixing structure of the oblique cable shown in FIG. It is a plane sectional view showing other examples of arrangement of a side tension tension material arranged so that it may penetrate a steel shell and a concrete block. It is a plane sectional view showing an example of the reinforcing bar arrangement which can be adopted in the fixing structure of the oblique cable according to the present invention.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view showing an extradosed type cable-stayed bridge in which the fixing structure of the present invention can be suitably employed.
This cable-stayed bridge is composed of a bridge girder 3 laid over the abutment 1 and the pier 2, a main tower 4 raised on the pier 2, and an axial direction of the bridge girder 3 from the upper part of the main tower 4. It has a plurality of diagonal cables 5 and 6 that are stretched obliquely downward and support the bridge girder 3 in an oblique direction.
The extradosed type cable-stayed bridge has a relatively large bending rigidity of the bridge girder 3 and a small height of the main tower 4, and the inclination angles of the oblique cables 5 and 6 are small.
The bridge girder 3 has a column head horizontal girder (not shown) immediately above the pier 2, and the bridge girder 3 and the pier 2 continuously form a rigid frame structure. And the said main tower 4 is integrally started up on the position in which the column head horizontal girder of the bridge girder 3 was provided.
The bridge girder 3 has a box-shaped cross section made of prestressed concrete, but the structure of the bridge girder 3 is not limited to such a structure, and is a composite structure of concrete and steel, web Other types of bridge girders may be used, such as those using a pre-cast plate or a truss structure. Moreover, the box girder etc. which were formed with steel may be sufficient.
FIG. 2 is an elevational sectional view of the upper part of the main tower 4 of the cable-stayed bridge shown in FIG. FIG. 3 is a plan sectional view of the cable fixing portion of the main tower 4.
The main tower 4 includes a leg portion 7 continuously raised from the bridge girder 3 integrated with the pier 2 and a cable fixing portion 8 provided on the leg portion. The first concrete block 11 and the second concrete block 12 to which the oblique cables 5 and 6 are fixed, the steel shell 13 provided so as to surround these concrete blocks, and the periphery of the steel shell 13 are covered. The outer concrete part 14 is formed.
The leg portion 7 has a reinforced concrete structure, is continuous with the bridge girder 3, and transmits a vertical force acting from the oblique cables 5 and 6 to the pier 2 via the bridge girder 3.
The steel shell 13 and the concrete blocks 11 and 12 are supported on the leg portion 7, and the steel shell 13 is fixed to the leg portion 7 with anchor bolts 15.
The steel shell 13 has a main part composed of two curved portion steel plates 13a processed so that the shape of a flat cross section is curved in a semicircular shape, and two connecting portion steel plates 13b that connect them. With these curved portion steel plates 13a and connecting portion steel plates 13b, the shape of the flat cross section is an oval having a long axis in the bridge axis direction. That is, the curved portion steel plates 13a at both ends in the bridge axis direction have cylindrical curved surfaces obtained by dividing a cylindrical shape having an axis in the vertical direction into two along the axis, and are connected to the connecting portion steel plates at both ends in the circumferential direction. 13b is connected, and the flat cross section becomes a closed shape.
The thickness of the bending portion steel plate 13a and the connecting portion steel plate 13b can be appropriately set according to the tensile force acting on the oblique cables 5, 6, the angle over which the oblique cables are stretched, the number of oblique cables, etc. A steel plate having a length of about 22 mm can be used.
  The two concrete blocks 11 and 12 provided in the cable fixing portion 8 are formed so as to be in close contact with the inner surface of the steel shell 13 at both ends in the bridge axis direction inside the steel shell 13. That is, after the steel shell 13 is installed at a predetermined position, the concrete is cast so as to be in close contact with a part of the curved portion steel plate 13a and the connecting portion steel plate 13b. The oblique cable 5 stretched to one side is fixed to the first concrete block 11, and the diagonal cable 6 stretched to the other side is fixed to the second concrete block 12. A space between the first concrete block and the second concrete block that enables the work of fixing the oblique cables 5 and 6 to the first concrete block or the second concrete block and the work of adjusting the tension, respectively. 16 is formed, and fixing portions of the oblique cables 5 and 6 are opposed to each other on both sides of the space 16.
The flat cross-sectional shape of each of the concrete blocks 11 and 12 is a curved shape following the shape of the bending portion steel plate 13a on the rear side of the fixing position of the oblique cables 5 and 6, and the fixing of the oblique cables 5 and 6 is performed. On the side, the fixing surface is formed so as to be substantially perpendicular to the axis of the oblique cables 5 and 6. The surfaces of the two concrete blocks 11 and 12 facing each other are inclined according to the inclination angle over which the oblique cables 5 and 6 are stretched, and each oblique cable is arranged in order to arrange the plurality of oblique cables 5 and 6 vertically. A fixing surface is formed with a step. Such a fixing surface is formed inside the steel shell 13 by a steel plate thinner than the steel shell 13 to form a fixing surface-shaped formwork, and concrete is cast in a range surrounded by the steel plate formwork 17 and the steel shell 13. It is formed by installing. The steel plate mold 17 is integrated with the concrete blocks 11 and 12 without being removed.
In addition, it is desirable to arrange reinforcing bars in the concrete blocks 11 and 12 so that cracks do not occur due to the supporting pressure applied from the oblique cables 5 and 6.
  The oblique cables 5 and 6 pass through the curved steel plate 13a and the first concrete block 11 or the second concrete block 12, and are surrounded by the two concrete blocks 11 and 12 and the two connecting steel plates 13b. 16 is fixed to the concrete blocks 11 and 12. An insertion hole is provided at a position where the oblique cables 5 and 6 of the steel shell 13 pass, and a pipe member 19 is embedded in the concrete blocks 11 and 12. It is inserted into the pipe member 19 through the insertion hole of the shell 13 and fixed by the fixing tool 20 in a state where a predetermined tension force is introduced.
  A plurality of the same number of diagonal cables are fixed to each of the first concrete block 11 and the second concrete block 12, and the inclination angle gradually increases from the diagonal cable fixed at the uppermost level to the cable fixed at the lowermost level. It is stretched to increase. The diagonal cable 5 fixed to the first concrete block 11 and the diagonal cable 6 fixed to the second concrete block 12 are in pairs, and these diagonal cables are substantially the same height. Has been established.
Corresponding to the oblique cables 5 and 6 being arranged and fixed in the vertical direction, the steel shell 13 has a plurality of layers arranged in the vertical direction by dividing lines 21 as shown in FIG. It is divided into parts. Tensile force is transmitted from one pair or two or more pairs of diagonal cables 5 and 6 to each of the divided portions, so that the horizontal component is substantially canceled for each divided portion. In the vertical direction, at the boundary between the divided parts, the lower edge of the upper divided part and the upper edge of the lower divided part are opposed to each other, but they are not continuous, but the vertical force Is not expected to be transmitted. Therefore, precise processing is not performed on the opposed lower edge and upper edge.
In addition, after each of the divided portions is arranged at a predetermined position, the lower end edge of the upper divided portion and the upper end edge of the lower divided portion may be joined by welding or the like.
  The outer concrete portion 14 is formed by placing concrete so that the steel shell 13 is in close contact with the steel shell 13 after the steel shell 13 is disposed at a predetermined position. A non-slip member 22 is fixed to the outer peripheral surface of the steel shell 13 by welding, and the outer concrete portion 14 behaves integrally with the steel shell 13 by placing concrete so as to be embedded. It has become. Accordingly, the outer concrete portion 14 can bear the vertical component acting from the oblique cables 5 and 6 together with the concrete blocks 11 and 12 inside the steel shell 13, and the outer concrete portion 14 is perpendicular to the leg portion 7 of the main tower 4. Is transmitted smoothly. Moreover, the bending rigidity of the main tower 4 is increased by the outer concrete portion 14, and the degree of stress due to the bending of the main tower 4 is reduced. In particular, when the oblique cables stretched on both sides are not on the same straight line in plan view, a bending moment in the direction perpendicular to the bridge axis is generated in the main tower, but the outer concrete part effectively resists the bending moment. Become.
Reinforcing bars (not shown) are arranged on the outer concrete portion 14, and a part of the tensile force generated in the circumferential direction of the steel shell 13 by arranging the horizontal reinforcing bars along the outer peripheral surface of the steel shell 13. Can be borne.
Moreover, the said slip prevention member 22 provided in the outer peripheral surface of the steel shell 13 can be made into the stud diver which attached the rod-shaped steel member by welding etc., for example. Moreover, a steel plate may be joined by welding. The steel plate may be provided with a reinforcing bar insertion hole, and the reinforcing bar disposed outside the steel shell 13 may be inserted through the reinforcing bar insertion hole provided in the steel plate.
  Placing the concrete to form the outer concrete portion 14 is performed after the steel shells 13 are arranged so as to be stacked up and down and the concrete blocks 11 and 12 are formed on the inner side. It is desirable to do this before power is introduced. At this time, the central portion 14a in the bridge axis direction does not perform the concrete placement as the rear placement portion, and performs the concrete placement by preceding the portion 14b divided into two in the bridge axis direction. And after the tensile force of the diagonal cables 5 and 6 is introduced, the concrete of the center part 14a is laid. Thereby, it can suppress that the steel shell 13 deform | transforms with the tensile force of the diagonal cables 5 and 6 and a crack arises in the outer side concrete part 14. FIG.
In such an oblique cable fixing structure, the concrete blocks 11 and 12 to which the oblique cables 5 and 6 are fixed are connected by a steel shell 13 formed so as to surround them, and the oblique cables 5 and 6 are connected in the direction of the bridge axis. Forces acting in opposite directions on both sides are transmitted to each other via the steel shell 13. As a result, the horizontal component of the tensile force acting on the upper portion of the main tower 4 from the oblique cables 5 and 6 is canceled out between the oblique cables 5 and 6 stretched on both sides, and a large horizontal force is exerted on the main tower 4. Acting in one direction is avoided.
On the other hand, the vertical component of the tensile force transmitted from the oblique cables 5 and 6 is transmitted downward by the concrete blocks 11 and 12 and the outer concrete portion that are continuous in the vertical direction, and passes through the bridge girder 3 from the leg 7 of the main tower. It is supported by the pier 2 via.
  The horizontal force acting on the steel shell 13 from the concrete blocks 11 and 12 to which the oblique cables 5 and 6 are fixed is transmitted as a tensile force of the curved portion steel plate 13a of the steel shell 13 by the curved shape, and the concrete block The force can be transmitted smoothly without providing a large number of slip prevention members or the like for integrating 11, 12 and the steel shell 13. Therefore, the structure of the oblique cable fixing portion becomes simple and the workability can be improved.
2 and 3, the outer concrete portion 14 is provided so as to cover the periphery of the steel shell 13, but the steel shell is provided without providing the outer concrete portion as shown in FIG. 13 may be exposed. Even in such a fixing structure, the same steel shell 13 and concrete blocks 11 and 12 can be used, and the oblique cables 5 and 6 can be similarly fixed.
However, since the outer concrete portion is not provided, it is necessary to perform a process such as rust prevention without providing a slip prevention member outside the steel shell 13.
FIG. 5 is an elevational sectional view showing a fixing structure of an oblique cable according to the second embodiment of the present invention, and FIG. 6 is a plan sectional view of the same fixing structure.
This oblique cable fixing structure has the same steel shell 33, concrete blocks 31, 32 and outer concrete portion 34 as the fixing structure shown in FIGS. 2 and 3, and the oblique cables 5, 6 are provided on the steel shell 34. The first concrete block 31 or the second concrete block 32 is fixed through the inserted insertion hole. In this oblique cable fixing structure, a plurality of lateral fastening tension members 41 are arranged on the outer concrete portion 34 so as to be horizontal at right angles to the bridge axis direction. The laterally tightening tension member 41 is arranged outside the steel shell 33 and in close proximity to both ends of the steel shell 33 in the bridge axis direction, and a plurality of oblique cables 5, 6 stretched obliquely downward from the upper part of the main tower. Between the uppermost diagonal cable and the lowermost diagonal cable. And the compressive force of the orthogonal direction of a bridge axis is previously introduced into the outer concrete part 34 in the vicinity of the both ends of the steel shell 33 in the bridge axis direction by the tension force introduced into this lateral fastening tension member 41.
  A steel rod is used for the above-mentioned tension material 41, which is inserted into a sheath (not shown) embedded in the outer concrete portion 34, and tension is introduced after the concrete forming the outer concrete portion 34 is cured. Is done. The concrete is placed so that at least one end of the laterally tightening tension member 41 is exposed, and is embedded in the outer concrete portion 34 after the introduction of the tension force.
  In such a slant cable fixing structure, a lateral fastening tension member 41 introduces a compressive force in the direction perpendicular to the bridge axis to the outer concrete portion 34, and from the outer concrete portion 34 via a detent member 37 or the outer concrete. The force in the direction perpendicular to the bridge axis is transmitted directly from the contact portion between the portion 34 and the steel shell 33, and the curved portion steel plate 33a is compressed in the circumferential direction of the curved portion steel plate 33a in the vicinity of the position where the curved portion steel plate 33a protrudes most in the bridge axis direction. Force in the direction to act. Thereby, a part of tensile force which acts on the circumferential direction of the bending part steel plate 33a is canceled by the tensile force of the diagonal cables 5 and 6, and the load of the bending part steel plate 33a is reduced. The bending portion steel plate 33a has a cross-sectional defect due to the insertion hole through which the oblique cables 5 and 6 penetrate. However, the tensile stress generated by the bending portion steel plate 33a due to the force in the compression direction due to the tension of the lateral fastening tension member 41. It is possible to suppress the degree from becoming excessive.
FIG. 7 is a vertical cross-sectional view showing a fixing structure of an oblique cable according to a third embodiment of the present invention, and FIG. 8 is a plan cross-sectional view of the fixing structure shown in FIG.
This oblique cable fixing structure has the same steel shell 53, concrete blocks 51, 52 and outer concrete portion 54 as the fixing structure shown in FIGS. 2 and 3, and the oblique cables 5, 6 are the first concrete blocks. 51 or the second concrete block 52 is fixed. In this oblique cable fixing structure, a plurality of lateral fastening tension members 61 are arranged so as to be horizontal at right angles to the bridge axis direction, and penetrate the steel shell 53 and the concrete blocks 51 and 52 from the outer concrete portion 54. ing. These laterally tightening tension members 61 are arranged at positions penetrating the curved portion steel plate 53a of the steel shell 53, inserted into openings provided in the curved portion steel plate 53a of the steel shell, and both end portions of the outer concrete portion 54. Has been established.
These laterally tightening tension members 61 are arranged between a plurality of oblique cables 5 and 6 that are stretched obliquely downward from the fixing portion, on the upper side of the uppermost oblique cable and on the lower side of the lowermost oblique cable. Has been.
  Similar to the fixing structure shown in FIG. 5 and FIG. 6, the horizontal fastening tension member 61 uses a steel rod, and is inserted into a sheath (not shown) to provide concrete blocks 51 and 52, and an outer concrete portion 54. Tension is introduced after the concrete to form the is cured.
In such an oblique cable fixing structure, the lateral fastening tension member 61 introduces a compressive force in the direction perpendicular to the bridge axis to the outer concrete portion 54, and the outer concrete portion 54 is pressed against the steel shell 53. Are pressed against the inner concrete blocks 51 and 52. And the force which is going to compress in the circumferential direction of the curved part steel plate 53a is transmitted in the both ends of the steel shell 53 in a bridge axis direction. Accordingly, a part of the tensile force acting in the circumferential direction of the bending portion steel plate 53a is offset by the tensile force of the oblique cables 5 and 6, and the load on the bending portion steel plate 53a is reduced.
Further, since the concrete blocks 51 and 52 and the steel shell 53 are in pressure contact, the force transmitted from the oblique cables 5 and 6 to the concrete blocks 51 and 52 is transmitted from the pressure contact portion to the steel shell 53, and the curved portion. The tensile stress degree of the portion protruding in the bridge axis direction of the steel plate 53a is reduced.
In the embodiment shown in FIGS. 7 and 8, the lateral fastening tension member 61 penetrates the curved portion steel plate 53a, but the fixing position of the oblique cables 5 and 6 in the bridge axis direction as shown in FIG. It is also possible to dispose the lateral tightening tension material 62 at a position near the connecting portion steel plate 53b, or at a position penetrating the connecting portion steel plate 53b. When the laterally tightening tension material 62 is arranged in this manner, the steel shell 53 is strongly pressed against the concrete blocks 51 and 52, and the force transmitted at the contact surface between the steel shell 52 and the concrete blocks 51 and 52 is increased. To do. However, the force compressing in the circumferential direction of the steel shell 53 at both ends in the bridge axis direction of the steel shell 53 decreases.
Note that the lateral fastening tension members 62 arranged as shown in FIG. 9 can also be arranged together with the fixing structure in which the lateral fastening tension members 61 are arranged as shown in FIG.
FIG. 10 is a plan sectional view showing an example of the arrangement of reinforcing bars of the concrete blocks 51 and 52 and the outer concrete portion 54 that can be employed in the fixing structure of the oblique cable according to the embodiment of the present invention.
The reinforcing bars can be arranged separately in the concrete block inside the steel shell and in the outer concrete portion, but as shown in FIG. 10, the steel blocks 53 are passed through the concrete blocks 51 and 52 and the outer concrete portion 54 as shown in FIG. Reinforcing bars can be arranged to be continuous with each other.
Reinforcing bars are arranged in the vertical and horizontal directions in the concrete blocks 51 and 52 and the outer concrete part 54, and a reinforcing bar 63 arranged to be continuous from the concrete blocks 51 and 52 to the outer concrete part 54 is provided in the steel shell 53. It penetrates the formed reinforcing bar insertion hole and is arranged almost horizontally in the bridge axis direction and the direction perpendicular to the bridge axis. And the vertical reinforcing bar 64 is arrange | positioned so that these reinforcing bars may be crossed. By arranging the reinforcing bars in this way, the integrity of the concrete blocks 51 and 52 inside the steel shell 53 and the outside concrete portion 54 outside the steel shell 53 can be increased.
  In the concrete blocks 51 and 52 and the outer concrete portion 54, in addition to the reinforcing bars 63 penetrating the steel shell 53, reinforcing bars 66 are disposed along the surface of the outer concrete portion 54, and along the outer peripheral surface of the steel shell 53. Thus, the reinforcing bar 65 can be arranged so as to surround the steel shell in the circumferential direction. The reinforcing bars 65 arranged in the circumferential direction along the outer circumferential surface of the steel shell 53 are continuous in a closed shape and can resist the tensile force in the circumferential direction. Such a reinforcing bar 65 bears a part of the tensile force in the circumferential direction when the tensile force of the oblique cables 5 and 6 acts on the concrete blocks 51 and 52 and a tensile force is generated in the circumferential direction of the steel shell 53. can do.
The present invention is not limited to the embodiments described above, and can be implemented as other embodiments within the scope of the present invention.
For example, in the present embodiment, the present invention is applied to an extradosed type cable-stayed bridge. However, the present invention is not limited to an extradosed type cable-stayed bridge. It can also be applied to. In addition, the number of diagonal cables, the angle at which the cables are arranged, and the like can be determined as appropriate, and the shape and dimensions of the main tower can be appropriately designed correspondingly.
1: abutment, 2: pier, 3: bridge girder, 4: main tower, 5, 6: diagonal cable, 7: leg of main tower, 8: cable fixing part of main tower,
11: first concrete block, 12: second concrete 7-reed block, 13: steel shell, 13a: curved steel plate of steel shell, 13b: connecting steel plate of steel shell, 14: outer concrete portion, 15: anchor Bolt, 16: space surrounded by two concrete blocks and steel shell, 17: steel plate formwork, 19: pipe member, 20: fixing device for oblique cable, 21: dividing line for steel shell, 22: non-slip member ,
31: 1st concrete block, 32: 2nd concrete block, 33: Steel shell, 33a: Curved steel plate of steel shell, 33b: Steel plate connecting steel plate, 34: Outer concrete portion, 35: Anchor bolt, 37: Non-slip member
41: Tension material for side fastening,
51: 1st concrete block, 52: 2nd concrete block, 53: Steel shell, 53a: Curved steel plate of steel shell, 53b: Connection steel plate of steel shell, 54: Outer concrete part, 55: Anchor bolt, 57: Non-slip member
61, 62: Tensile material for lateral fastening, 63: Reinforcing bars arranged through the steel shell, 64: Reinforcing bars in the vertical direction, 65: Reinforcing steel arranged to surround the steel shell in the circumferential direction, 66: Outer concrete part Reinforcing bars placed along the surface

Claims (5)

  1. A plurality of diagonal cables that are suspended diagonally below one side and the other side in the axial direction of the bridge girder from the upper part of the main tower of the cable-stayed bridge (hereinafter referred to as the bridge axial direction) and support the bridge girder are supported on the upper part of the main tower. The fixing structure of the oblique cable to be fixed,
    Two connecting portion steel plates arranged so that the plate surface is in the direction of the bridge axis, and arranged to face each other with a space in the direction perpendicular to the axis of the bridge girder (hereinafter referred to as the direction perpendicular to the bridge axis), A steel shell that is joined so as to connect the edges in the bridge axis direction of the connecting portion steel plate, and has a curved portion steel plate that forms a smoothly curved curved surface, and has a shape in which the flat cross section is closed,
    A first concrete block and a second concrete block formed so as to be in close contact with the curved steel plate of the steel shell in the vicinity of one end and the other end in the bridge axis direction inside the steel shell, respectively. A concrete block,
    The upper end portion of the oblique cable passes through an insertion hole provided in the curved portion steel plate,
    The upper end of the oblique cable that is stretched from the upper part of the main tower to the one side in the bridge axis direction and supports the bridge girder is fixed to the first concrete block,
    An oblique cable fixing structure characterized in that an upper end portion of an oblique cable that is stretched from the upper part of the main tower to the other side in the direction of the bridge axis and supports the bridge girder is fixed to the second concrete block. .
  2. An outer concrete part closely contacting the outside of the steel shell;
    A transversely tightened tension member that is arranged substantially horizontally in the direction perpendicular to the bridge axis in the vicinity of both ends of the steel shell in the bridge axis direction, and that both ends are fixed to the outer concrete part in a state where tension force is introduced. The fixing structure for an oblique cable according to claim 1.
  3. An outer concrete part closely contacting the outside of the steel shell;
    A transversely tightening tension member that is arranged substantially horizontally in a direction perpendicular to the bridge axis, and in which tension is introduced, both ends are fixed to the outer concrete part,
    The transverse fastening tension material is inserted through an opening provided in the steel shell and penetrates through the first concrete block or the second concrete block inside the steel shell. Item 2. A fixing structure for an oblique cable according to Item 1.
  4.   The reinforcing bar which continues from the said 1st concrete block or the 2nd concrete block to the said outside concrete part through the reinforcing-bar insertion hole provided in the said steel shell is arrange | positioned. The fixing structure of the oblique cable described in 1.
  5. 3. The outer concrete portion is provided with a circumferential reinforcing bar that is spaced from the outer peripheral surface of the steel shell outside the steel shell and surrounds the outer surface of the steel shell. The fixing structure of the diagonal cable according to any one of claims 1 to 4.
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CN110485262A (en) * 2019-07-29 2019-11-22 中交四公局第一工程有限公司 A kind of bridge sling connection structure

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Publication number Priority date Publication date Assignee Title
FR2626909A1 (en) * 1988-02-05 1989-08-11 Muller Jean HAUBANE BRIDGE AND METHOD OF CONSTRUCTION
JPH0643314Y2 (en) * 1989-01-25 1994-11-09 黒沢建設株式会社 Tension end fixing device
JP2578053B2 (en) * 1992-10-08 1997-02-05 新日本製鐵株式会社 Fixing mechanism and fixing method of steel bar in tension structure
JP4387071B2 (en) * 2001-05-28 2009-12-16 三井住友建設株式会社 Building a main tower of cable-stayed bridge
JP4449788B2 (en) * 2005-03-04 2010-04-14 鹿島建設株式会社 Hinge joint structure of RC structural member
JP4078367B2 (en) * 2005-08-16 2008-04-23 三井住友建設株式会社 Cable-stayed cable fixing structure
FR2973818B1 (en) * 2011-04-07 2017-06-02 Soletanche Freyssinet METHOD AND DEVICE FOR PROTECTING THE END OF AN ANCORED CABLE

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