JP2008133654A - Method of repairing joint section of viaduct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively and easily repair water leakage at a joint section of a viaduct for the New Truck Train passing through cold and heavy snow fall areas. <P>SOLUTION: An existing joint member installed at the joint section to be repaired is unchanged. Anchor bolts 33 are implanted, at a predetermined pitch, on both sides of the joint section along the joint section. A waveform cover member 32 in which the tops 33 and bottoms 34 extending in the longitudinal direction and arranged continuously with each other in the lateral direction is prepared as a repair member. With the tops 33 and bottoms 34 of the repair member arranged parallel to the expansion gap of the joint section, the existing joint member is covered by the repair member and the repair member is fixed with the anchor bolts 33. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for repairing a joint part of a viaduct, and more particularly to a repair method for a joint part of a viaduct, and more particularly, to a method for repairing a joint part in a Shinkansen viaduct passing through a heavy snow region.

  FIG. 9 shows a cross section of the railway viaduct. In FIG. 9, reference numeral 10 indicates a bridge girder. 12 is a bridge pier. As shown in FIG. 9, in the case of the railway viaduct, the sections that are higher by one step are the track sections 13 and 13. Both sides of the bridge girder 10 are lowered to form passages or side grooves 15 through which return water and rainwater flow.

  In viaducts such as highways and railways, there is a joint part with a gap at the joint between the bridge girder 10 and the bridge girder 10, and expansion and contraction in the length direction of each bridge girder 10 is absorbed by this joint part.

Thus, as an example of the joint between the viaduct bridge girder and the bridge girder, FIG.
In FIG. 10, a gap a is set between the end faces of the bridge beams 10. The width a between the joints of the joint portion becomes narrower when the bridge girder 10 expands and extends, and conversely becomes wider when the bridge girder 10 contracts. For example, a bridge girder having a length of 50 m has an expansion / contraction of 20 to 30 mm, and a gap a is set within a range in which the expansion / contraction amount is absorbed.

  A cover rubber 20 is attached as a joint material to the joint where the play gap a is formed, and the cover rubber 20 is used to stop water so that rainwater or the like does not leak downward. Conventionally, as a joint material, a synthetic rubber is used, which is sufficiently resistant to mechanical conditions such as direct sunlight, wind and rain, and differences in temperature, and repeated expansion and contraction.

  The cover rubber 20 is formed with an expansion / contraction part 21 having a U-shaped cross section so as to follow the fluctuation of the width a between play. Fixed portions 22 are formed on both sides of the stretchable portion 21. The cover rubber 20 can be attached by inserting the fixing portion 22 into the hole of the base rubber 23. A protective steel plate 24 is placed on the cover rubber 20, and the protective steel plate 23 is fixed by fixing anchor bolts 25. In addition, 26 is a mortar material packed in the gap.

  The joint material applied to the joint portion of the conventional viaduct is deteriorated due to aging, and the cover rubber 20 is torn or a hole is formed and is damaged. Therefore, some repair work is required at the joints of the viaduct.

  By the way, in the case of the Shinkansen viaduct, the purpose of repair differs depending on the region.

  For example, in areas where there is a lot of snow in winter, such as the Niigata area ahead of the Joetsu Shinkansen from the Joetsu Shinkansen, and north of Sendai on the Tohoku Shinkansen, a sprinkler is provided to remove snow from the railway. The water sprinkled from the sprinkler and the water in which the snow has melted are collected by flowing through the gutters of the bridge girder and reused by the sprinkler as water for removing snow.

  In cold regions, if there is a hole in the cover rubber 20 at the joint, water leaks from there under the bridge girder, which not only reduces the recovery rate for reuse as sprinkler water, but also in the severe cold season. If there is, the water from the bridge girder freezes and becomes a large icicle. If these icicles fall, it will be very dangerous for people and vehicles passing under the bridge girder.

  Moreover, in the bridge girder whose surface of the base material concrete is covered with the adjustment mortar, there is a problem that water flows into a gap between the interface between the concrete and the adjustment mortar, and the water leaks from the joint portion.

  Therefore, repair of joints is indispensable in the viaduct of the Shinkansen that passes through areas with a lot of snow. However, the repair work applied to the joints so far is only to replace the damaged cover rubber 20 with a new one, and an effective repair method has not been developed.

  Accordingly, an object of the present invention is to solve the problems of the prior art and to effectively and easily repair water leakage at joints of viaducts such as Shinkansen passing through cold heavy snow areas. It is in providing a joint repair method and joint repair structure.

  In order to achieve the above-mentioned object, the present invention provides a joint that leaks due to aging of existing joint material that stops the gap in a viaduct joint having a gap formed at a joint between the bridge girder and the bridge girder. An anchoring process for repairing a part, the existing jointing material constructed on the joint part to be repaired being left as it is, and anchor bolts being implanted at predetermined pitches on both sides along the joint part; A repairing member is prepared as a corrugated cover member in which peaks and troughs extending in the longitudinal direction are continuous in the short direction, and this repair is performed with the clearance between the crests and troughs of the repairing member parallel to the joints. A step of covering the existing joint material with a member and fixing the repair member with the anchor bolt.

  Further, the present invention is a repair structure of a joint part that leaks due to aging of existing joint material that stops the gap in the viaduct joint part having a gap formed at the joint between the bridge girder and the bridge girder. The existing joint material constructed in the joint part to be repaired remains as it is, and the mountain, valley and the joint are formed by a repair member made of a corrugated cover member in which the peaks and valleys extending in the longitudinal direction are continuous in the short direction. It is characterized in that the existing joint material is covered in a state where the clearance between the parts is parallel, and the repair member is fixed by anchor bolts planted at predetermined pitches on both sides along the joint part. is there.

  According to the present invention, by tightening the lock nut on the anchor bolt, the cover member is fixed, and at the same time, water stop can be applied. And, since the cover member has a corrugated shape, it absorbs fluctuations due to the expansion and contraction of the bridge girder, and can be used universally for joints with a wide range of gaps, removing existing joint materials and creating new joints. It is possible to effectively and easily repair water leaks at joints of viaducts such as the Shinkansen that passes through cold heavy snow areas without the need for replacement with materials.

Hereinafter, an embodiment of a joint repair method for a viaduct according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows the left half of the end face of a Shinkansen viaduct bridge girder to which the joint repair method of the viaduct of the present invention is applied.

  In FIG. 1, reference numeral 10 indicates a bridge girder. A track section 13 extends in parallel to the portion of the bridge girder 10 that is one step higher. Then, both sides of the bridge girder 10 are lowered to form passages or side grooves 15 through which return water and rainwater flow. In the side groove 15, a cable portion 16 and a water pipe 17 for sending water for snow removal are laid.

  As shown in FIG. 1, there are a first repair region 18 and a second repair region 19 where the joints of the bridge girder 10 and the bridge girder 10 are repaired. The first repair region 18 corresponds to the side groove 15 and the joint portion of the lower portion between the track sections 13, and the second repair region 19 corresponds to the side wall of the bridge girder 10 and the joint portion of the track section 13. is doing. In the first repair area 18, repair is applied to apply the present invention in order to complete the water stop, whereas in the second repair area 19, it is not necessary to stop the water. Repairs to refill the filler to be sealed.

  The joint portion of the first repair region 18 before carrying out the repair has a structure as shown in FIG. 8 described above, and in order to stop the joint portion where the gap a is formed, A cover rubber 20 is attached. The cover rubber 20 is protected by a protective steel plate 24.

Hereinafter, the repair method for the joint portion in the first repair portion 18 will be described with reference to FIGS.
FIG. 2 shows a process of implanting anchor bolts 30 on both sides of the joint portion by a chemical anchor method.

  First, bolt holes 31 for embedding the anchor bolts 30 at a predetermined pitch are drilled with a rock drilling machine on the concrete exposed surfaces on both sides across the joint. After drilling, air is blown into each bolt hole 31 to remove concrete fragments and chips, and a capsule containing an adhesive is inserted. Thereafter, anchor bolts 31 are embedded in the respective bolt holes 31, and the adhesive is cured and cured.

  Next, as shown in FIG. 2, the concrete surface is cleaned over a predetermined range on both sides of the anchor bolt 30 at the center. This cleaning range S corresponds to a seal surface against which a fixing portion of the repair member 32 described below is pressed.

  FIG. 3 shows a cover member 32 used as a repair member for covering the existing joint material.

In FIG. 3, the cover member 32 is a cover made of rubber having an elongated and bent shape as a whole.

  In this embodiment, the cover member 32 is formed with linearly extending peaks 33 and valleys 34 in the longitudinal direction, and these peaks 33 and valleys 34 are alternately continuous in a wave shape in the lateral direction. .

  The left and right edge portions extending in the longitudinal direction of the cover member 32 are formed with fixing portions 35 that are fastened with nuts that are screwed to the anchor bolts 30 and fixed to the concrete surface. The fixing portion 35 is flat and thick, and anchor bolt holes 36 are formed at a predetermined pitch. Note that two grooves 37 extending in the longitudinal direction are formed on the back surface of the fixing portion 35, and a seal member 38 is attached to the grooves 37 (see FIG. 4).

  Therefore, as shown in FIG. 4, the cover member 32 is set so as to cover the existing joint material. The longitudinal direction of the cover member 32 is aligned with the direction in which the play between the joints runs, so that the peaks 33 and the valleys 34 are parallel to the play between the joints. At this time, since the existing joint material is left as it is, the cover rubber 20, the base rubber 23, and the mortar material 26 packed in the gap are not removed. However, it is preferable that the sagging prevention plate 39 is laid.

  Then, the anchor bolt 30 is passed through the hole 36 of the fixing portion 35 of the cover member 32 and the presser fitting 40 is placed thereon. Further, the cover member 32 is covered with a thin protective plate 41. This protective plate 41 is cantilevered by an anchor bolt 30 on one side. If the lock nut 43 is fastened to the anchor bolt 30 via the washer 42, the cover member 32 can be fixed. A cap 44 for preventing rust is attached to the tip of the anchor bolt 33.

  By repairing the joint portion of the viaduct formed at the joint portion between the bridge girder 10 and the bridge girder 10 as described above, water leakage from the joint portion can be effectively prevented as follows.

  First, the function of the cover member 32 used as a repair member will be described. The cover member 32 is basically a sealing material that stops the joint, but has a waveform shape in which peaks 33 and valleys 34 are alternately continuous. Since it has, it deform | transforms following the fluctuation | variation of the joint width a accompanying expansion and contraction of the bridge girder 10, and absorbs this.

  That is, the fluctuation amount of the joint width a due to the expansion and contraction of the bridge girder can be easily absorbed by the deformation of the waveform shape of the cover member 32. Moreover, according to the cover member 32, the same cover member 32 can be used for general purposes even if the joint width a is various, for example, 30 mm, 40 mm, 50 mm,. From the structure in which the waveform shape is deformed, it can be said that it is inherently suitable for repairing joint portions having a relatively wide joint width a.

  Furthermore, in the repair method of the present embodiment, the cover member 32 can be fixed by tightening the lock nut 43 to the anchor bolt 30, and at the same time, the fixing portion 35 is pressed against the concrete surface by the presser fitting 40, so that the seal member 38 is Since it is effective, it is possible to simply and reliably stop water without having to remove the existing joint material and replace it with a new joint material.

  Next, FIG. 5 shows a corner fitting used for the corner portion of the first repair region 18 in FIG.

  Since the wall stands up at a right angle in the joint portion of the corner portion, the fixing portion 35 of the cover member 32 cannot be brought into close contact with each other, so that the seal of the fixing portion 35 does not sufficiently work and there is a possibility that water leaks from the gap.

Therefore, by using the corner fitting 50 as shown in FIG. 5, water stoppage at the corner can be ensured.
In this embodiment, the corner metal fitting 50 is a metal fitting in which an angle portion 51 bent at a right angle and an R portion 52 having a concave curved surface are integrated. Anchor bolts 53 are implanted in the R portion 52 in advance. The angle part 51 is fixed using anchor bolts 54 and 55 embedded in the concrete surface. In addition, the water stop process is performed by caulking between the presser fitting 50 and the concrete surface.

As shown in FIG. 6, such a corner fitting 50 is used in combination with curved presser fittings 58 and 59 corresponding to the corner fitting 50. The presser fitting 58 is pressed against the fixing portion 35 of the cover member 32, the presser fitting 59 is applied to the R portion 52, and the lock nut 43 is fastened to the anchor bolt 53, thereby fixing the fixing portion 35 of the cover member 32 to the R portion. It becomes possible to press it by following the curved surface of 52. Thereby, the sealing member 38 of the fixing | fixed part 35 comes to exhibit a sealing function effectively.
Therefore, by combining the repair structure of FIG. 4 and the repair structure of this corner portion, the snow is removed by the sprinkler as in the case of the Shinkansen viaduct passing through the heavy snow region, and the melted water is reused by the sprinkler as water for snow removal. In such a viaduct, effective joint repair can be performed.

Next, FIG. 7 shows another embodiment of the present invention.
In this embodiment, an improvement is added to the fixing structure of the cover member 32. In the above-described embodiment, as shown in FIG. 4, the fixing portions 35 at both side edges of the cover member 32 are fixed by fastening the lock nuts 43 to the anchor bolts 30. In the embodiment, the holding member 60 that presses the fixing portion 35 of the cover member 32 and the clamp member 61 are used, and the clamp member 61 is tightened by fastening the lock nut 43 to the anchor bolt 30. The cover member 32 is fixed by pressing the presser fitting 60 against the fixing portion 35. In FIG. 4, one side of the protection plate 41 is free, but in the embodiment of FIG. 7, both side edges of the protection plate 41 are firmly fixed by the presser fitting 60.

  According to this embodiment, since it is not necessary to pass the anchor bolt 30 through the fixing portion 35 of the cover member 32, the anchor bolt 30 does not have to be implanted in accordance with the hole through which the anchor bolt 30 is passed. There is an advantage that the degree of freedom of the process of implanting the anchor bolt is increased, such as the pitch interval.

Next, FIG. 8 shows still another embodiment of the present invention.
In the embodiment of FIG. 8, the surface of the base material concrete of the bridge girder 10 is covered with the adjustment mortar 70. When the concrete is covered with the adjustment mortar 70 in this way, water flows through a gap formed at the interface between the concrete and the adjustment mortar 70. Therefore, in order to stop this internal water flow, as shown in FIG. Repair structure is applied.

  That is, the adjustment mortar 71 within the range in which the cover member 32 is attached is removed to expose the base material concrete. Then, similarly to FIG. 7, the lock nut 43 is fastened to the anchor bolt 30 using the presser fitting 60 and the clamp member 61.

  Thereby, also about the internal flowing water which flows through the clearance gap between concrete and the adjustment mortar 70, the sealing member 38 in the back surface of the fixing | fixed part 35 of the cover member 32 works, and it can prevent leaking from the gap of a joint part.

  In addition, when the surface is covered with adjustment mortar, it is also possible to apply the repair structure of FIG.

The figure which shows the end surface of the bridge pier of the Shinkansen viaduct to which the repair method of the viaduct joint part by this invention is applied. Sectional drawing which shows the process of implanting an anchor bolt in the repair method of the viaduct joint part by one Embodiment of this invention. The perspective view which shows the cover member used as a repair member in the repair method of the viaduct joint part by one Embodiment of this invention. Sectional drawing which shows the state in which the cover member was attached as a repair member in the repair method of the viaduct joint part by one Embodiment of this invention. The perspective view which shows the corner metal fitting used for repair of a corner part in the repair method of the viaduct joint part by one Embodiment of this invention. Sectional drawing which shows a structure when the cover member is fixed in the corner part in the repair method of the viaduct joint part by one Embodiment of this invention. Sectional drawing which shows the fixing structure of the cover member by the repair construction method of the viaduct joint part by other embodiment of this invention. Sectional drawing which shows repair structure at the time of applying the fixing structure of the cover member by the repair method of the viaduct joint part by embodiment of FIG. 7 to the joint part covered with adjustment mortar. A cross-sectional view of a railway viaduct. The cross-sectional view which shows the structure of the conventional viaduct joint part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bridge girder 13 Track section 15 Side groove 16 Cable part 17 Water pipe 20 Cover rubber 23 Base rubber 30 Anchor bolt 32 Cover member 33 Mountain 34 Valley 35 Fixing part 38 Sealing member 40 Holding metal fitting 43 Lock nut 50 Corner metal fitting 51 Angle part 52 R part 60 Presser bracket 61 Clamp member 70 Adjusting mortar

Claims (6)

In the joint part of the viaduct having a gap formed at the junction between the bridge girder and the bridge girder, a repair method for the joint part leaking water due to aging of the existing joint material that stops the gap,
An anchoring process in which anchor bolts are planted at a predetermined pitch on both sides of the existing joint material, which is constructed on the joint part to be repaired, as it is,
Prepare a corrugated cover member with crests and troughs extending in the longitudinal direction running in the short direction as repair members, and make the clearance between the crests and troughs of the repair members parallel to the joints. Covering the existing joint material and fixing the repair member with the anchor bolt;
A method for repairing a joint part of a viaduct characterized by comprising:   2. The method of repairing a joint portion of a viaduct according to claim 1, wherein the repair member is fixed at a joint portion of the pier corner portion using a corner fitting having a concave curved R portion in which anchor bolts are implanted. .   The method for repairing a joint portion of a viaduct according to claim 1, wherein the viaduct is a Shinkansen viaduct that passes through a snowy area. In the joint part of the viaduct having a gap formed at the junction between the bridge girder and the bridge girder, the repair structure of the joint part leaking water due to aging of the existing joint material that stops the gap,
With the existing joint material constructed in the joint part to be repaired as it is, the mountain, valley and the joint part are formed by a repair member made of a corrugated cover member in which the peaks and valleys extending in the longitudinal direction are continuous in the short direction. A joint of the viaduct characterized in that the existing joint material is covered in a state in which the clearances of the joints are parallel, and the repair member is fixed by anchor bolts planted at predetermined pitches on both sides along the joint portion. Department repair structure.   Fixing portions that are fixed to the concrete surface by lock nuts and presser fittings that are respectively screwed into the anchor bolts are formed on both edges in the longitudinal direction of the repair member, and a sealing material is attached to the back surface of the fixing portion. The joint structure for repairing a viaduct according to claim 4.   6. The viaduct joint repair structure according to claim 5, wherein a protective plate that covers the repair member is fastened by a lock nut and a presser fitting at the fixing portion.

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