JP6628778B2 - Abutment reinforcement structure - Google Patents

Description

  The present invention relates to an abutment reinforcing structure for reinforcing an existing abutment.

  Conventionally, in order to seismically reinforce an existing abutment, a hole penetrating the abutment and reaching the stable ground diagonally below is formed, a reinforcing member made of steel is inserted into the hole from one end, and then the solidified material is filled. A technique has been disclosed in which the abutment and the reinforcing member are integrated by solidifying and fixing the other end of the reinforcing member to the ground portion of the abutment (see Patent Document 1).

  FIG. 24 shows a plan view of a conventional abutment reinforcing structure. FIG. 25 is a sectional view taken along the line ZZ of FIG.

  For example, when such a technique is used for an abutment 1 in which a portion below a girder 3 is used for a road or the like, a structure as shown in FIGS. When the lower part of the girder 3 is used for a road or the like, the lower side of the girder 3 of the abutment 2 becomes a space, so that the abutment 2 is pressed in the direction of arrow A from the outside by earth pressure. Conventionally, in order to restrict the movement due to this pressing, the ground anchor 100 that reaches the stable ground is driven downward from the lower side of the girder through the abutment 2 and obliquely downward, and the inclination of the abutment 2 is pulled outward. Was.

JP 2002-167711 A

  However, it is difficult to perform the construction work of driving the ground anchor 100 from the narrow space below the girder 3. For example, even if the ground anchor 100 is driven into the upper part of the abutment 2 so that the head 101 of the ground anchor 100 is arranged above, the girder 3 becomes an obstacle. In addition, when the fixing layer into which the ground anchor 100 is driven is deep, the construction period becomes long, and the construction cost increases.

  After the construction, the head 101 of the ground anchor 100 supporting the abutment projects about 50 cm to 1 m into the space below the girder 3 and remains as an obstacle. In order to make the remaining ground anchor 100 function effectively and to prevent the head 101 from falling, periodic maintenance is required.

  An object of the present invention is to provide an abutment reinforcing structure that reinforces an existing abutment, which has a small influence on a space under a girder, enables low-cost and quick construction, and is easy to inspect and maintain.

The abutment reinforcing structure of one embodiment according to the present invention,
Multiple abutments,
A girder bridged across the plurality of abutments facing each other;
Used for bridges with
A regulating member facing at least one of the inner wall surface of at least one abutment of the opposed abutments or at least one end surface of the girder with a gap therebetween;
Having a reinforcing member installed on at least a part of opposing inner front surfaces of the plurality of abutments,
The reinforcing member is installed in a slit formed in an up-down direction on an opposed front surface of the plurality of abutments,
The vertical force on the inner front surface of the abutment is suppressed by the regulating member and the earth pressure from the backside of the abutment.

Further, the abutment reinforcing structure of one embodiment according to the present invention,
The reinforcing member,
A first reinforcing member installed in a slit formed on an opposed front surface of the plurality of abutments;
A second reinforcing member connected to a lower end of the first reinforcing member;
It is characterized by including .

Further, the abutment reinforcing structure of one embodiment according to the present invention,
The reinforcing member is installed on at least a part of a parapet facing the plurality of abutments .

  According to one embodiment of the present invention, there is provided an abutment reinforcing structure that reinforces an existing abutment, which has a small effect on a space under a girder, enables low-cost and quick construction, and is easy to inspect and maintain. It is possible to do.

1 shows a plan view of a bridge and an abutment reinforcing structure according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along line AA of FIG. 1. 1 shows an enlarged view of a part of an abutment reinforcing structure of a first embodiment according to the present invention. FIG. 4 shows a sectional view taken along line BB of FIG. 3. FIG. 4 shows a cross-sectional view taken along line CC of FIG. 3. The top view of the bridge and the abutment reinforcement structure of the 1st example of a 2nd embodiment concerning the present invention is shown. FIG. 7 shows a cross-sectional view taken along line DD of FIG. 6. FIG. 4 is an enlarged view of a part of an abutment reinforcing structure according to a second embodiment of the present invention. FIG. 9 shows a cross-sectional view taken along the line EE of FIG. 8. FIG. 9 shows a cross-sectional view taken along line FF of FIG. 8. FIG. 9 shows an enlarged view of a part of an abutment reinforcing structure of a second example of the second embodiment according to the present invention. FIG. 12 shows a sectional view taken along line GG of FIG. 11. FIG. 12 shows a sectional view taken along line HH of FIG. 11. The top view of the bridge and the abutment reinforcement structure of a 3rd embodiment concerning the present invention is shown. FIG. 17 shows a JJ cross-sectional view of FIG. 14. FIG. 9 is an enlarged view of a part of an abutment reinforcing structure according to a third embodiment of the present invention. FIG. 17 is a sectional view taken along line KK of FIG. 16. 9 shows an auxiliary reinforcing element of a first example added to the abutment reinforcing structure of the third embodiment. 14 shows an auxiliary reinforcing element of a second example added to the abutment reinforcing structure of the third embodiment. 14 shows an auxiliary reinforcing element of a third example added to the abutment reinforcing structure of the third embodiment. 21 is a sectional view taken along line LL of FIG. 20. FIG. 22 is a sectional view taken along line MM of FIG. 21. 14 shows an auxiliary reinforcing element of a fourth example added to the abutment reinforcing structure of the third embodiment. The top view of the conventional abutment reinforcement structure is shown. FIG. 25 is a sectional view taken along line ZZ of FIG. 24.

  Hereinafter, an abutment reinforcing structure according to an embodiment of the present invention will be described.

  FIG. 1 is a plan view of a bridge 1 and an abutment reinforcing structure 10 according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along line AA of FIG.

  An existing bridge 1 using the abutment reinforcing structure 10 of the present embodiment has an abutment 2 and a girder 3 to be bridged over the abutment 2. The abutment 2 has a support surface 2a for supporting the girder 3, a first wall surface 2b rising from the support surface 2a, and a second wall surface 2c descending from the support surface 2a. The girder 3 is supported by a support member 4 placed on the support surface 2a. In the existing bridge 1, a first gap δ1 having a predetermined size is formed between the first wall surface 2b of the abutment 2 and the end surface 3a of the girder 3. The first gap δ1 is equal to or more than the amount of expansion and contraction due to the temperature change of the girders 3 and is a predetermined ratio to the length of the girders 3, depending on the material.

  The abutment reinforcing structure 10 of the present embodiment is used for a bridge 1 including a plurality of abutments 2 and a girder 3 spanning the abutment 2. In the abutment reinforcing structure 10, when a force for inclining the abutment 2 is applied by the earth pressure or the like, the regulating member 11 receives the force and the inclination can be suppressed.

  First, the abutment reinforcing structure 10 of the first embodiment will be described.

  FIG. 3 is an enlarged view of a part of the abutment reinforcing structure 10 according to the first embodiment of the present invention. FIG. 4 is a sectional view taken along line BB of FIG. FIG. 5 is a sectional view taken along the line CC of FIG.

  In the bridge 1 of the first embodiment, the girder 3 has an RC structure or a PC structure. In addition, as another embodiment, the beam 3 may be a steel structure.

  The abutment reinforcing structure 10 includes a regulating member 11, a filling member 12, a base plate 13, and an anchor bolt 14.

  The restricting member 11 is a member different from the spar 3 and is bridged in parallel with the spar 3 on a planar support surface 2a formed inside the two opposing abutments 2. The regulating member 11 is bridged via a base plate 13 on a filling member 12 placed on the support surface 2a. A second gap δ2 is formed between at least one end surface 11a of the regulating member 11 and the abutment 2. The second gap δ2 is preferably smaller than the first gap δ1 formed between the abutment 2 and the girder 3.

  Further, the regulating member 11 is formed of steel. The cross-sectional shape of the regulating member 11 in a direction orthogonal to the spar 3 is rectangular.

In the first embodiment, the material of the regulating member 11 is steel and the cross-sectional shape is rectangular. However, as another embodiment, the material and the shape of the regulating member 11 may be other values if appropriately determined according to design strength or the like. The material and shape may be used. For example, the material of the regulating member 11 may be concrete or a material containing both steel and concrete, and the cross-sectional shape may be any of a circle, an I shape, an H shape, and the like.

  The filling member 12 is placed on the support surface 2 a of the abutment 2. The filling member 12 is preferably formed in a plate shape from concrete. The base plate 13 is provided between the regulating member 11 and the filling member 12. The base plate 13 is a steel plate and is fixed to the regulating member 11 by welding or the like.

  As shown in FIG. 5, a plurality of long holes 13 a extending in the longitudinal direction of the regulating member 11 are formed in the base plate 13. The anchor bolt 14 is inserted into a long hole 13 a formed in the base plate 13, penetrates the filling member 12, and is driven into the abutment 2, thereby attaching the regulating member 11 to the abutment 2. Both ends 11a of the regulating member 11 supported by the support surface 2a face the first wall surface 2b of the abutment 2, respectively.

  The abutment reinforcing structure 10 of the first embodiment installed in this manner has a small effect on the space below the girder 3, enables quick construction at low cost, and is easy to inspect and maintain. It becomes possible to provide the abutment reinforcing structure 10 for reinforcing the abutment 2. Further, since the regulating member 11 is a member different from the spar 3 and is bridged over the plurality of abutments 2 facing each other, the influence on the space below the spar 3 is reduced.

  Further, as shown in FIG. 5, by inserting the anchor bolt 14 into the long hole 13 a formed in the base plate 13, even if the regulating member 11 made of steel or the like expands and contracts with a change in temperature, the anchor bolt 14 Since 14 is arranged in the elongated hole 13a, stress due to expansion and contraction of the regulating member 11 does not occur in the anchor bolt 14, and expansion and contraction of the regulating member 11 due to temperature change can be allowed.

  Further, when the abutment 2 starts to be inclined due to earth pressure or the like, the relative position between the anchor bolt 14 and the long hole 13a of the base plate 13 changes. When the inclination of the abutment 2 is constant, the anchor bolt 14 comes into contact with the end of the elongated hole 13 so that the relative position cannot be further changed. Since the opposite end of the regulating member 11 is fixed to the abutment 2 on the opposite side and cannot move, from this stage onward, the regulating member 11 receives the force of tilting the abutment 2 and suppressing the inclination. It becomes possible.

  Further, even when the earth pressure for inclining the abutment 2 is large and the anchor bolt 14 and the base plate 13 are damaged and the abutment 2 is further inclined, the abutment 2 contacts the regulating member 11 and the regulating member 11 is stretched. Thus, the force for tilting the abutment 2 can be received, and the tilt can be suppressed. In this case, since δ1> δ2, the spar 3 does not contact the first wall surface 2b.

  Thus, in the abutment reinforcing structure 10 of the first embodiment, the inclination of the abutment 2 can be suppressed without damaging the girder 3.

  In addition, since the gap between the abutment 2 and the regulating member 11 is equal to or greater than the amount of expansion and contraction due to the temperature change of the girder 3, in an environment where the abutment 2 is not inclined and is normally used, the contact between the abutment 2 and the regulating member 11 should be prevented. It can be prevented.

Next, the abutment reinforcing structure 20 of the second embodiment will be described. In the second embodiment, a regulating member is attached below the beam 3. A case where a steel girder 3 is used as a first example of the second embodiment and a case where a girder 3 containing concrete is used as a second example will be described.

  FIG. 6 shows a plan view of a bridge 1 and an abutment reinforcing structure 20 of a first example of the second embodiment according to the present invention. FIG. 7 is a sectional view taken along the line DD of FIG. FIG. 8 is an enlarged view of a part of the abutment reinforcing structure 20 of the first example of the second embodiment according to the present invention. FIG. 9 is a sectional view taken along line EE of FIG. FIG. 10 is a sectional view taken along line FF of FIG.

  The beam 3 of the bridge 1 of the first example of the second embodiment is an I-beam as shown in FIG. The beam 3 has a web 3b, an upper flange 3c formed at an upper end of the web 3b, and a lower flange 3d formed at a lower end of the web 3b.

  The abutment reinforcing structure 20 of the first example of the second embodiment includes a regulating member 21 and a high tension bolt 22.

  The regulating member 21 is formed of steel having a base 21a, an upper flange 21b formed at an upper end of the base 21a, and a side flange 21c formed at a side end of the base 21a. The upper flange 21b of the regulating member 21 is attached to the lower flange 3d of the girder 3 by the high tension bolt 22.

  The end surface 3a of the spar 3 supported by the support surface 2a is opposed to the first wall surface 2b with a first gap δ1 therebetween, and at least one side flange 21c of the regulating member 21 is A third gap δ3 is left between the wall and the wall 2c. The third gap δ3 between the side flange 21c of the regulating member 21 and the second wall surface 2c of the abutment 2 is preferably smaller than the first gap δ1 between the abutment 2 and the girder 3.

  In the abutment reinforcing structure 20 of the first example of the second embodiment installed as described above, the position of the regulating member 21 can be set at a position higher than the head 101 of the ground anchor shown in FIG. It is possible to provide an abutment reinforcing structure 20 for reinforcing the existing abutment 2 which has a small influence on a space below the third abutment 3, enables quick construction at low cost, and is easy to inspect and maintain.

  In addition, when the abutment 2 actually inclines, the abutment 2 comes into contact with the regulating member 21, so that the abutment 2 can be suppressed from inclining.

  In addition, by appropriately adjusting the strength relationship between the high-tensile bolt 22 and the steel material near the lower flange 3 d of the girder 3 to which the high-tensile bolt 22 is attached, and the strength of the restricting member 21, the above three members can be relatively replaced. It is also possible to reduce damage to the girder 3 by absorbing the inclination energy of the abutment 2 by damaging only the high tension bolt 22 and the regulating member 21 which are easy, and to restore the bridge in a short time.

  Further, it is preferable that the high tension bolt 22 is inserted into a hole formed in advance after removing a rivet normally attached to the lower flange 3 d of the existing girder 3. By using the existing hole, the regulating member 21 can be easily attached to the girder 3, thereby enabling quicker construction at lower cost.

  Further, since the gap between the abutment 2 and the regulating member 21 is equal to or larger than the amount of expansion and contraction due to the temperature change of the girder 3, in a normal use environment where the abutment 2 is not inclined, the contact between the abutment 2 and the regulating member 21 must be prevented. It can be prevented.

FIG. 11 is an enlarged view of a part of an abutment reinforcing structure 30 of a second example of the second embodiment according to the present invention. FIG. 12 is a sectional view taken along line GG of FIG. FIG. 13 is a sectional view taken along line HH of FIG.

  The girder 3 of the bridge 1 of the second example of the second embodiment is a long rectangular parallelepiped as shown in FIG. 11, and includes concrete of RC construction or PC construction.

  The abutment reinforcing structure 30 of the second example of the second embodiment includes a regulating member 31 and a post-installed anchor 32. The regulating member 31 may be made of steel or concrete. The upper surface 31a of the regulating member 31 is attached to the lower surface 3e of the spar 3 with the post-installed anchor 32.

  The end surface 3a of the spar 3 supported by the support surface 2a faces the first wall surface 2b with a first gap δ1 therebetween, and at least one side surface 31b of the regulating member 31 is connected to the second wall surface 2c. And a fourth gap δ4 therebetween. The fourth gap δ4 between the side surface 31b of the regulating member 31 and the second wall surface 2c of the abutment 2 is preferably smaller than the first gap δ1 between the abutment 2 and the girder 3.

  In the abutment reinforcing structure 30 of the second example of the second embodiment installed in this manner, the position of the regulating member 31 can be set at a position higher than the head 101 of the ground anchor shown in FIG. The abutment reinforcing structure 30 that has a small effect on the space below the third abutment 3, enables quick construction at low cost, and reinforces the existing abutment 2 that is easy to inspect and maintain.

  In addition, when the abutment 2 actually inclines, the abutment 2 comes into contact with the regulating member 31 first, so that the inclination of the abutment 2 can be suppressed.

  In addition, since the gap between the abutment 2 and the regulating member 31 is equal to or larger than the amount of expansion and contraction due to the temperature change of the girder 3, in an environment where the abutment 2 is not inclined and is normally used, the contact between the abutment 2 and the regulating member 31 should be prevented. It can be prevented.

  Next, the abutment reinforcing structure 40 of the third embodiment will be described.

  FIG. 14 is a plan view of the bridge 1 and the abutment reinforcing structure 40 according to the third embodiment of the present invention. FIG. 15 shows a JJ cross-sectional view of FIG. FIG. 16 is an enlarged view of a part of the abutment reinforcing structure 40 according to the third embodiment of the present invention. FIG. 17 is a sectional view taken along line KK of FIG.

  The abutment reinforcing structure 40 of the third embodiment includes a regulating member 41 attached to at least one first wall surface 2b of each of the opposed abutments 2. The material of the regulating member 41 may be rubber or the like. The restricting member 41 attached to the first wall surface 2 b faces the end surface 3 a of the spar 3.

  The abutment reinforcing structure 40 of the third embodiment installed in this manner has no effect on the space below the girder 3, enables quick construction at low cost, and is easy to inspect and maintain. An abutment reinforcing structure 40 for reinforcing the abutment 2 can be provided.

  In addition, when the abutment 2 is actually inclined, the abutment 2 comes into contact with the regulating member 41, so that the inclination of the abutment 2 can be suppressed. Further, since the material of the regulating member 41 is rubber or the like, it is possible to reduce damage to the end of the beam 3.

  In addition, since the gap between the girder 3 and the regulating member 41 is equal to or more than the amount of expansion and contraction due to the temperature change of the girder 3, in an environment where the abutment 2 is not inclined and is normally used, the contact between the abutment 2 and the regulating member 41 must be prevented. It can be prevented.

  In the present embodiment, the regulating member 41 is in contact with the first wall surface 2b of the abutment 2, but the embodiment is not limited to this, and the regulating member 41 is in contact with the end surface 3a of the spar 3, Alternatively, a form that does not contact either the first wall surface 2b or the end surface 3a of the spar 3 may be used.

  Next, auxiliary reinforcing elements used in the abutment reinforcing structures 10 to 40 will be described. The auxiliary reinforcing element can be used in each of the abutment reinforcing structures 10 to 40 of the first to third embodiments.

  First, the auxiliary reinforcing element of the first example will be described.

  FIG. 18 shows a first example of an auxiliary reinforcing element 50 added to the abutment reinforcing structure 40 of the third embodiment.

  The auxiliary reinforcing element 50 of the first example has a reinforcing member 51 such as a reinforcing bar driven from the upper surface of the abutment 2. The reinforcing member 51 is inserted into a hole formed in the parapet portion 2e. The holes are preferably formed in a vertical direction. The depth of the hole is preferably deeper than the parapet portion 2e. The hole into which the reinforcing member 51 is inserted is filled with cement paste, mortar, or the like.

  As described above, by using the auxiliary reinforcing element 50 of the first example for the abutment reinforcing structures 10 to 40 of the first to third embodiments, the abutment 2 in contact with the girder 3 can receive the force received from the girder 3. The force applied to the vicinity in the vertical direction by the force received from the outside by the earth pressure is suppressed, and the abutment 2 can be further reinforced.

  Next, an auxiliary reinforcing element of a second example will be described.

  FIG. 19 shows a second example of the auxiliary reinforcing element 60 added to the abutment reinforcing structure 40 of the third embodiment.

  The auxiliary reinforcing element 60 of the second example has a reinforcing member 61 installed on at least a part of the front surface below the second wall surface 2c. The reinforcing member 61 is made of a steel plate or a fibrous sheet such as carbon or aramid. The reinforcing member 61 may be installed on the entire lower surface including the second wall surface 2c.

  As described above, by using the auxiliary reinforcing element 60 of the second example for the abutment reinforcing structures 10 to 40 of the first to third embodiments, the abutment 2 in contact with the girder 3 can receive the force received from the girder 3. The force applied to the vicinity in the vertical direction by the force received from the outside by the earth pressure is suppressed, and the abutment 2 can be further reinforced.

  Next, an auxiliary reinforcing element of a third example will be described.

  FIG. 20 shows a third example auxiliary reinforcing element 70 added to the abutment reinforcing structure 40 of the third embodiment. FIG. 21 is a sectional view taken along line LL of FIG. FIG. 22 is a sectional view taken along line MM of FIG.

  As shown in FIG. 21, the auxiliary reinforcing element 70 of the third example has a reinforcing member 71 installed in a slit formed on the lower front surface including the second wall surface 2c. The reinforcing member 71 is made of a reinforcing bar or a fibrous member such as carbon or aramid.

As shown in FIG. 22, the slit in which the reinforcing member 71 is installed is filled with a cement paste, mortar, or the like. Therefore, the front surface of the abutment 2 is covered with cement paste, mortar, or the like, and the reinforcing member 71 is not exposed.

  As described above, by using the auxiliary reinforcing element 70 of the third example for the abutment reinforcing structures 10 to 40 of the first to third embodiments, the abutment 2 in contact with the girder 3 can receive the force received from the girder 3. The force applied to the vicinity in the vertical direction by the force received from the outside by the earth pressure is suppressed, and the abutment 2 can be further reinforced.

  FIG. 23 shows a fourth example of the auxiliary reinforcing element 80 added to the abutment reinforcing structure 40 of the third embodiment.

  Further, the auxiliary reinforcing element 80 of the fourth example has a second reinforcing member 82 such as a reinforcing bar connected to the lower end of the first reinforcing member 81 in addition to the auxiliary reinforcing element 70 of the third example. The second reinforcing member 82 is inserted into the underground and the abutment 2 by making an oblique hole. The hole into which the second reinforcing member 82 is inserted is filled with cement paste, mortar, or the like. When both the first reinforcing member 81 and the second reinforcing member 82 are steel bars, it is preferable that the first reinforcing member 81 and the second reinforcing member 82 be connected by welding or a joint.

  As described above, by using the auxiliary reinforcing element 80 of the fourth example for the abutment reinforcing structures 10 to 40 of the first to third embodiments, the abutment 2 in contact with the girder 3 receives the force received from the girder 3. The force applied to the vicinity in the vertical direction by the force received from the outside by the earth pressure is suppressed, and the abutment 2 can be further reinforced. In addition, the second reinforcing member 82 is inserted into the underground and the abutment 2 by making an oblique hole, and the second reinforcing member 82 is connected to the lower end of the first reinforcing member 81 to reduce the amount of soil to be excavated. Meanwhile, the abutment 2 can be further reinforced.

  The auxiliary reinforcing elements 50 to 80 of the first to fourth examples may be used in combination.

  As described above, according to the abutment reinforcing structures 10, 20, 30, and 40 of the present embodiment, the bridge 1 including the plurality of abutments 2 and the girder 3 bridged over the plurality of opposed abutments 2. A regulating member 11, which is opposed to at least one of the wall surfaces 2b, 2c of at least one of the abutments 2 or at least one end surface 3a of the girder 3 among the opposed abutments 2, The bridge abutment reinforcing structure for reinforcing the existing bridge abutment 2 which has a small effect on the space below the girder 3 because it has 21, 31 and 41, enables low-cost and quick construction, and is easy to inspect and maintain. 10, 20, 30, and 40 can be provided.

  In the abutment reinforcing structure 10 of the present embodiment, the gap between the abutment 2 and the regulating members 11, 21, 31, 41 is smaller than the gap between the abutment 2 and the girder 3, so that the abutment 2 is temporarily inclined. In this case, the regulating members 11, 21, 31, and 41 come into contact with the abutment 2, and the inclination of the abutment 2 can be suppressed.

  Further, in the abutment reinforcing structure 10 of the present embodiment, the gap between the abutment 2 and the regulating members 11, 21, 31, 41 is equal to or larger than the amount of expansion and contraction due to the temperature change of the girder 3, so that the abutment 2 is not normally inclined. In such an environment, it is possible to prevent the abutment 2 from coming into contact with the regulating members 11, 21, 31, and 41.

  Further, in the abutment reinforcing structure 10 of the present embodiment, since the regulating member 11 is a member different from the girder 3 and is bridged to the plurality of abutments 2 opposed to each other, the regulating member 11 is provided in a space below the girder 3. The effect is reduced.

  Further, the abutment reinforcing structure 10 of the present embodiment includes a base plate 13 for installing the regulating member 11 on the abutment 2, and a regulating member for inserting a bolt 14 for connecting the regulating member 11 to the abutment 2. Since the elongated hole 13a extending in the longitudinal direction of the eleventh portion 11 is formed, the restricting member 11 can allow expansion and contraction due to a temperature change.

  In addition, in the abutment reinforcing structures 20 and 30 of the present embodiment, since the regulating members 21 and 31 are attached to the lower surface of the girder 3, low-cost and quick construction is possible.

  In the abutment reinforcing structure 20 of the present embodiment, the girder 3 is made of steel, and the regulating member 21 is attached by the high tension bolt 22 inserted into the existing hole formed in the girder 3. Holes can be used, which enables quick construction at lower cost.

  Further, in the abutment reinforcing structure 40 of the present embodiment, since the regulating member 41 is attached between the end face of the girder 3 and the wall surface of the abutment 2, there is no effect on the space below the girder 3 and the cost is low. Rapid construction is possible, and it is possible to reinforce the existing abutment 2 which is easy to inspect and maintain.

  In the abutment reinforcing structure 40 of the present embodiment, the total of the clearance between the abutment 2 and the regulating member 41 and the clearance between the girder 3 and the regulating member 41 are smaller than the clearance between the abutment 2 and the girder 3. In the case where is inclined, the regulating member 41 comes into contact with the abutment 2 first, the inclination of the abutment 2 can be suppressed, and the damage of the girder 3 can be reduced.

  Also, in the abutment reinforcing structure 40 of the present embodiment, the total of the gap between the abutment 2 and the regulating member 41 and the gap between the girder 3 and the regulating member 41 is equal to or more than the amount of expansion and contraction due to the temperature change of the girder 3. In a normal use environment where is not inclined, it is possible to prevent the abutment 2 and the regulating member 41 from coming into contact with each other.

  Further, in the abutment reinforcing structures 10, 20, 30, and 40 of the present embodiment, since the abutment 2 that is in contact with the girder 3 has the reinforcing member 51 that is provided on at least a part of the parapet 2e facing the plurality of abutments 2. Thus, the force applied to the vicinity of the middle in the vertical direction is suppressed by the force received from the girder 3 and the force received from the outside due to the earth pressure, and the abutment 2 can be further reinforced.

  Further, in the abutment reinforcing structures 10, 20, 30, and 40 of the present embodiment, since the abutment 2 in contact with the girder 3 is provided because the abutment 2 is provided on at least a part of the front surface 2c of the plurality of abutments 2 facing each other. Thus, the force applied to the vicinity of the middle in the vertical direction is suppressed by the force received from the girder 3 and the force received from the outside due to the earth pressure, and the abutment 2 can be further reinforced.

  Further, the abutment reinforcing structures 10, 20, 30, and 40 of the present embodiment have the reinforcing members 71 installed in the slits formed in the front surfaces 2c of the plurality of abutments 2 facing each other. However, the force applied near the middle in the vertical direction is suppressed by the force received from the girder 3 and the force received from the outside by the earth pressure, and the abutment 2 can be further reinforced.

  Further, in the abutment reinforcing structures 10, 20, 30, 40 of the present embodiment, the first reinforcing member 81 installed in the slit formed on the front surface 2 c of the plurality of abutments 2 facing each other, and the lower end of the first reinforcing member 81. And the abutment 2 in contact with the girder 3 suppresses a force applied in the vicinity of the middle in the vertical direction by a force received from the girder 3 and a force received from the outside by earth pressure, The abutment 2 can be further reinforced, and the abutment 2 can be further reinforced while reducing the amount of excavated soil.

As described above, various embodiments of the present invention have been described, but the present invention is not limited to only these embodiments, and various variations and modifications may be added to the detailed contents. Further, embodiments configured by appropriately combining the configurations of the respective embodiments are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Bridge 2 ... Abutment 3 ... Girder 4 ... Support member 10, 20, 30, 40 ... Abutment reinforcement structure 11, 21, 31, 41 ... Restriction member 12 ... Filling member 13 ... Base plate 14 ... Anchor bolt 14
22 high tension bolt 32 post-installed anchor 50, 60, 70, 80 auxiliary reinforcing elements 51, 61, 71 reinforcing member 81 first reinforcing member 82 second reinforcing member

Claims (3)

Multiple abutments,
A girder bridged across the plurality of abutments facing each other;
Used for bridges with
A regulating member facing at least one of the inner wall surface of at least one abutment of the opposed abutments or at least one end surface of the girder with a gap therebetween;
Having a reinforcing member installed on at least a part of opposing inner front surfaces of the plurality of abutments,
The reinforcing member is installed in a slit formed in an up-down direction on an opposed front surface of the plurality of abutments,
An abutment reinforcing structure, characterized in that a vertical force on an inner front surface of the abutment is suppressed by the regulating member and earth pressure from the backside of the abutment. The reinforcing member,
A first reinforcing member installed in a slit formed on an opposed front surface of the plurality of abutments;
A second reinforcing member connected to a lower end of the first reinforcing member;
The abutment reinforcing structure according to claim 1 , comprising: The reinforcing member, the abutment reinforcement structure according to claim 1 or 2, characterized in that it is installed in at least a part of the parapet facing the plurality of abutment.

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