JP4477556B2 - Seismic reinforcement method for bridge and telescopic device used in this method - Google Patents

Description

  The present invention relates to a seismic reinforcement method for bridges, and in particular, a method for reducing the horizontal displacement of a girder and the top of a bridge pier at the time of an earthquake by inserting a filling material in a girder gap, and improving seismic resistance, And it is invention regarding the construction method and apparatus for realizing this.

In recent years when large-scale earthquakes occur frequently, earthquake countermeasures for existing structures such as bridges have become an important issue, and various seismic reinforcement methods have been proposed to date. For example, as an earthquake countermeasure for existing bridges, there is a method to reduce the earthquake inertia force by filling the gap between gaps with an elastic material (for example, natural rubber or chloroprene rubber) having an impact absorbing function. It has been.
Japanese Patent Laid-Open No. 11-71714

  When trying to fill the gap between gaps as an earthquake countermeasure for existing bridges, traditionally, first, traffic regulation was performed, and expansion devices (rubber joints) installed on the road surface above the gap between gaps , Finger joints, comb joints, etc.) were removed, the gap between the girders was exposed upward, and filling work such as filling material was performed from the road surface.

  However, since bridges have more traffic than other general roads, and there are many cases where detouring is not easy, traffic regulation may have a great adverse effect on the traffic conditions of surrounding roads. is there. For this reason, the practical use of the earthquake-proof reinforcement construction which can be implemented without performing traffic regulation as much as possible is desired.

  The present invention has been made to solve such a problem in the prior art, and is implemented without a traffic restriction (or the time for the traffic restriction can be shortened) with a simple operation. An object of the present invention is to provide a method for seismic reinforcement of a bridge that can significantly reduce the construction cost, and a concrete method and apparatus for realizing the method.

  In the seismic reinforcement method for a bridge of the present invention, first, an end face of an abutment parapet that constitutes a girder gap portion, or a gap holder unit in which a guide holder is attached to the end face of a girder, and the gap member is fixed to the base plate It is characterized in that a filling material is disposed in the girder gap portion by inserting the girder gap portion from the side to the inside while being held by the guide holder.

  In addition, it is preferable that a means (connecting means) for connecting adjacent spacing material units is attached to one side edge or both side edges of each spacing material unit. It is possible to insert the gap filling material units into the girder gap portion while sequentially connecting them.

  Further, it is preferable that an expansion means such as a resin injecting bag is attached to the surface of each filling material fixed to the filling material unit. When the filling means such as resin is injected and the expansion means is inflated, the gap material unit and the girder gap portion are not deteriorated without deteriorating the workability when inserting the gap material unit. It is possible to suitably avoid the formation of a gap between the end faces constituting the structure.

The equipment for seismic reinforcement of a bridge according to the present invention comprises a filling material unit inserted into a girder gap for seismic reinforcement of a bridge, and a guide holder attached to an abutment parapet or end face of the girder. The unit is composed of a base plate , a padding material fixed to one surface of the base plate, and a connecting means for connecting adjacent padding unit units, and the guide holder crosses the padding material unit across the bridge. together is slidable in the direction, it is characterized that you have been configured to restrict movement in the vertical direction and Hashijiku direction. In this case, it is preferable that an expansion means that can be expanded by injecting a filler therein is attached to the filling material.

  According to the seismic strengthening method for bridges of the present invention, the seismic reinforcement work for existing bridges can be carried out by simple work without any traffic restrictions by inserting fillers from the side of the bridge into the girder gap. In addition, since it is not necessary to remove the extension device or install it again, the work process can be reduced and the construction cost can be greatly reduced.

  First, a “bridge seismic reinforcement method” according to the first embodiment of the present invention will be described. In the invention according to the present embodiment, for example, by inserting a filling material into the girder gap 2 (2a to 2c) of the bridge 1 as shown in FIG. In more detail, the guide holder is attached to the end surface 3a of the abutment parapet 3 or the end surface 4a of the beam 4 so that the filling material unit is held by the guide holder. In this state, the bridge is slid inward from the side of the bridge and inserted. Hereinafter, an example of the concrete construction procedure and its merit will be described.

(1. Attaching the guide holder)
Prior to inserting the filling material, first attach the guide holder. This guide holder functions as a guide when inserting the interstices into the girder gap 2 and holds and fixes the interstices on the end surface 3a of the abutment parapet 3 or on the end surface 4a of the girder 4. It functions as a thing.

  FIG. 2 is a perspective view of the abutment parapet 3 showing a state in which the guide holder is attached to the end face 3a in the girder gap portion 2a shown in FIG. 1, and FIG. 3 shows the end of the abutment parapet 3, the end of the spar 4, and It is a figure which shows the cross-sectional shape of a guide holder. Here, a guide holder A composed of a rail member 5a and a lower rail member 5b and a guide holder B composed of a rail member 5c and a lower rail member 5d are attached to the end surface 3a of the abutment parapet 3. .

  In the example of FIGS. 2 and 3, each of the rail members 5 a to 5 d has a protrusion 11 (see FIG. 3) that protrudes with a certain width in a direction orthogonal to the longitudinal direction, and the length dimension is As can be seen from FIG. 2, it is set to be slightly shorter than the width of the abutment parapet 3 to be attached. The lower rail members 5b and 5d are set to have slightly longer dimensions than the upper rail members 5a and 5c, and the ends of the lower rail members 5b and 5d are connected to the upper rail members 5a and 5c. They are arranged with a positional relationship such that they are outside the end.

  Further, the upper rail members 5a and 5c are fixed so that the protrusions 11 are directed downward and the longitudinal direction thereof is horizontal. On the other hand, the lower rail members 5b and 5d are parallel to the rail members 5a and 5c so that the protrusions 11 face upward at positions spaced apart from the upper rail members 5a and 5c, respectively. It is fixed to become.

  In the girder gap portions 2b and 2c shown in FIG. 1, as in the girder gap portion 2a shown in FIGS. 2 and 3, a pair of upper and lower parts is attached to the end surface 4a of the girder 4 and the end surface 3a of the abutment parapet 3. Each guide holder made of rail material is attached.

(2. Insertion of filling material)
When the installation of the guide holder is completed, the filling material units are sequentially inserted. For example, as shown in FIG. 4, the filling material unit is one or two filling materials 8 having a predetermined thickness, shape and structure on one surface of a rectangular base plate 7 having sufficient rigidity. It is fixed and facilitates the insertion work and attachment work of the filling material 8, and the holding and fixing force and stability of the filling material 8 to the end surface 3 a of the abutment parapet 3 or the end surface 4 a of the girder 4. It contributes to the improvement of

  In the example of FIG. 4, a connecting arm 9 (connecting means for the filling material unit 6) is attached to one side edge or both side edges of the filling material unit 6. It is comprised so that it can connect easily. This connecting arm 9 also contributes to facilitating the insertion work and attachment work of the filling material 8.

  More specifically, the procedure of the insertion work will be described. As shown in FIG. 4, first, the lower edge 7b of the base plate 7 of the first filling material unit 6 is moved to the end of the lower rail material 5b (or 5d). In the transverse direction of the bridge with the base plate 7 standing vertically with the base plate 7 standing vertically. Slide towards. Next, the upper edge 7a of the base plate 7 enters the groove at the end of the upper rail member 5a (or 5c) (the groove 13 (see FIG. 3) formed by the downward protrusion 11 and the end surface 3a). Let

  Here, the distance between the rail members 5a, 5b (or 5c, 5d) constituting the guide holder A (or B) is such that the base plate 7 is allowed to enter between the grooves 12, 13, and Since the distance between the two upper and lower protrusions 11, 11 is set to be smaller than the height of the base plate 7, the upper edge 7a and the lower edge 7b of the base plate 7 are respectively formed in the grooves 13, The inter-filling unit 6 in the state of entering the inside 12 is restricted from moving in the vertical direction and the bridge axis direction, and is held along the end surface 3 a of the abutment parapet 3.

  When the first filling material unit 6 is inserted into the guide holder A (or B), the connecting arm 9 of the next filling material unit 6 is connected to the connecting arm 9, and the filling material unit 6 is inserted into the guide holder in the same manner. Insert them into A (or B) and slide them further inward in the cross direction of the bridge. This procedure is repeated until the first inter-filling unit 6 reaches the opposite end of the guide holder A (or B). Further, a plurality of padding materials 8 are inserted in the same manner with respect to the girder gap portions 2b and 2c shown in FIG.

(3. Merits)
By performing the procedure as described above, as shown in FIG. 5 (showing a state in which the attachment unit 6 has been attached to the end surface 3a of the abutment parapet 3), a plurality of the filling materials 8 are replaced with a girder. It can be easily attached to the free space 2a. This point will be explained in more detail. Conventionally, the telescopic device on the road surface has been removed, the girdle gap portion is exposed upward, and filling work such as filling material is performed from the road surface. However, according to the construction method as described above, it is possible to fill the gap between the bridges from the side of the bridge, so that it is possible to carry out without restricting traffic. Moreover, since it is not necessary to remove the expansion device and install it again, the work process can be reduced and the construction cost can be greatly reduced.

  In addition, the girder gap is generally a very narrow space, and it is often impossible for an operator to enter, and in such a narrow space, a plurality of padding materials are individually attached one by one. However, according to the above construction method, once the guide holder is attached, it is extremely simple and reliable with only a simple operation. Filling material can be attached.

  Further, in the present embodiment, the lower rail members 5b and 5d are slightly longer than the upper rail members 5a and 5c, and the end portions of the lower rail members 5b and 5d are the upper rail members 5a and 5c. Since it arrange | positions so that it may become an outer side rather than an edge part, when inserting the padding material unit 6, alignment is easy. For example, when the lengths of the upper and lower rail members 5a to 5d are all the same and the end portions are aligned, the upper edge 7a and the lower edge 7b of the base plate 7 are inserted when the interlining material unit 6 is inserted. However, if the ends of the lower rail members 5b and 5d are located outside the upper rail members 5a and 5c as in the present embodiment, first, the lower rail member 5 If the filling unit 6 is gently lowered from above the end of 5b (5d), the lower edge 7b is aligned with the groove 12 of the lower rail member 5b (5d), and then slid in the lateral direction, The upper edge 7a naturally enters the groove 13 of the upper rail material 5a (5c), and the insertion work of the filling material unit 6 can be performed smoothly.

  In addition, in the crossing direction of the bridge, if all of the filling material units 6 are inseparable, the weight increases, so a crane is required for the insertion work, and it is sufficient on the side of the bridge. It is necessary to secure a wide space, but in this embodiment, each is divided into an easy-to-handle size and is configured to be inserted while being connected one by one. Can be done very easily.

  Further, by calculating and setting the length dimension of the connecting arm 9 in advance, it is possible to freely adjust the arrangement interval of the filling material 8 and to accurately arrange each filling material 8 at a desired position. Can do.

  In the present embodiment, a guide holder made of a pair of upper and lower rail members is used, but the interstitial material unit can be slid in the crossing direction of the bridge, and can be moved in the vertical direction and the bridge axis direction. Any structure can be used as long as the movement can be restricted. For example, the upper and lower edges of the base plate-shaped body are folded at a predetermined width on one side to hold the upper and lower edges of the base plate. The thing which formed the groove | channel which can be formed in parallel up and down etc. can also be used.

  In this embodiment, two guide holders (guide holders A and B) are used. However, a plurality of guide holders are not necessarily attached, and one guide holder may be used in some cases. However, as shown in FIG. 5, when the bridge additive 14 (gas pipe, water pipe, communication line, etc.) is present in the girder gap portion 2a, the area where the filling material 8 is disposed is defined as the additive 14 By dividing the area into an upper area and a lower area, and inserting the interposing material unit 6 by attaching a guide holder for each area, the work of temporarily blocking the additive 14 is not performed. Thus, the insertion work of the filling material 8 can be carried out smoothly.

  Furthermore, in this embodiment, a rectangular metal plate is used as the base plate 7 constituting the filling material unit 6, but it may not be made of metal as long as it has sufficient rigidity. As long as the upper edge 7a and the lower edge 7b are parallel, the overall shape may not be rectangular.

  By the way, the purpose of inserting the interstitial material into the girder gap is “to reduce the horizontal displacement of the girder and the pier top at the time of the earthquake and to improve the earthquake resistance”, in order to achieve this purpose effectively. Therefore, it is necessary to make the gap formed between the surface of the filling material after insertion and the end face of the spar opposite to this as small as possible (more preferably, to prevent the gap from being formed). is there.

  In order to realize this, the thickness of the gap corresponding to the gap between the gaps (the distance between the end surface of the abutment parapet and the end surface of the beam or the distance between the end surfaces of the two opposite beams) This means that it is only necessary to insert the filling material unit into the interstitial space. However, the size of the gap in the girder gap varies depending on the season (for example, as the girder material expands due to heat in the summer, the gap in the girder gap becomes smaller and vice versa in the winter). It is difficult to always make the thickness of the filling material unit coincide with the size of the gap in the gap between the gaps.

  On the other hand, since the filling material inserted into the girder gap portion naturally has elasticity due to its nature, the thickness dimension of the gap filling material unit is made slightly larger than the gap of the girder gap portion. If it is set and inserted into the girder gap in a compressed state, it can cope with the seasonal fluctuations as described above by its restoring force, that is, even if the gap of the girder gap fluctuates seasonally, It is considered that the surface of the filler can be made to follow the end face of the beam. However, it is very difficult to apply this method in the case where it is slid from the side of the bridge to insert the filling material into the gap portion.

  Therefore, as shown in FIG. 6 (1), a filling material unit 6 having a resin injection bag 15 attached to the surface 8a of the filling material 8 is prepared, and inserted into the girder gap portion 2a. A filler (for example, a synthetic resin that solidifies at room temperature) is injected into the interior from 15a, and the resin injection bag 15 is inflated as shown in FIG. 6 (2). Is formed in the gap between the filling material unit 6 and the end surface 4a of the girder 4 facing the filling material unit 6 without deteriorating the workability when the filling material unit 6 is inserted. Can be suitably avoided.

  In addition, when the filling material 8 is compressed to a considerable extent by applying a high pressure when injecting the resin, the compressed filling material 8 is used even if the gap between the beam gap portions 2a fluctuates seasonally. Due to the restoring force, the surface of the resin injection bag 15 can always follow the end face 4a of the beam 4.

  Next, a “bridge seismic reinforcement method” according to the second embodiment of the present invention will be described. In the invention according to this embodiment, as in the first embodiment, the girder 4 at the time of an earthquake can be obtained by inserting a filling material into the girder gap 2 (2a to 2c) of the bridge 1 as shown in FIG. In addition, the horizontal displacement of the top end of the bridge pier 10 is reduced and the earthquake resistance is improved. By installing an expansion / contraction device 16 to which the padding material 8 is previously attached as shown in FIG. The interstices 8 are arranged (see FIG. 1).

  In general, a bridge expansion / contraction device is a device for allowing expansion and contraction of a girder, a floor slab, and a road surface in the direction of a bridge axis, and is installed in a girder gap portion 2 shown in FIG. As described above, conventionally, when trying to insert a seismic reinforcement filler in the girder gap 2, the traffic is restricted, the existing extension device is removed, and the girder gap is opened upward. The work of inserting a filling material from the road surface and installing the expansion / contraction device again was performed.

  In the seismic strengthening method according to the present embodiment, as shown in FIG. 7, the interstices 8, 8 are placed on a pair of opposed lower plates 17 a, 17 b (portions that enter the girder gap when installed). By using the telescopic device 16 attached to each, the work process can be reduced, and the time for traffic regulation can be greatly reduced.

  It should be noted that this telescopic device 16 can be used not only as a new telescopic device to be re-installed after removing the existing telescopic device when performing seismic reinforcement on the existing bridge, but also when newly constructing a bridge. It can also be used as a telescopic device to be installed.

The figure which shows the typical example of the bridge 1 used as the application object of the "seismic reinforcement method of a bridge" concerning the 1st Embodiment of this invention. FIG. 3 is an explanatory view of a “bridge seismic reinforcement method” according to the first embodiment of the present invention, and is a perspective view of an abutment parapet 3 showing a state in which a guide holder is attached to an end surface 3a. It is explanatory drawing of the "the seismic reinforcement method of a bridge" concerning the 1st Embodiment of this invention, Comprising: The cross-section of the abutment parapet 3, the edge part of the girder 4, and the guide holders A and B. It is explanatory drawing of the "earthquake reinforcement method of a bridge" concerning the 1st Embodiment of this invention, Comprising: Explanatory drawing of the insertion operation | work of the filling material unit 6. FIG. It is explanatory drawing of the "earthquake-proof reinforcement method of a bridge | bridging" which concerns on the 1st Embodiment of this invention, Comprising: The figure which shows the state which the attachment of the padding material unit 6 to the end surface 3a of the abutment parapet 3 completed. FIG. 3 is an explanatory diagram of a “bridge seismic reinforcement method” according to the first embodiment of the present invention, and is a cross-sectional view of a filling material unit 6 in which a resin injection bag 15 is attached to a surface 8a of the filling material 8; It is explanatory drawing of "the seismic reinforcement method of a bridge" concerning the 2nd Embodiment of this invention, Comprising: Sectional drawing of the expansion-contraction apparatus 16 of the bridge used for this method.

Explanation of symbols

1: Bridge,
2, 2a to 2c: Girder interval,
3: Abutment parapet,
3a: end face,
4: Digit,
4a: end face,
5a to 5d: rail material,
6: Filling material unit,
7: Base plate,
7a: upper edge,
7b: lower edge,
8: Filling material,
8a: surface,
9: Connecting arm,
10: Pier
11: ridge,
12, 13: groove,
14: additive,
15: Bag for resin injection,
15a: inlet,
15b: air vent,
16: telescopic device,
17a, 17b: lower plate,
A, B: Guide holder,

Claims (5)

Attach the guide holder to the end face of the abutment parapet or the end face of the girder,
By inserting the filling material unit, which is formed by fixing the filling material to the base plate, while being held by the guide holder, by sliding it from the side of the girder gap portion to the inside, it is inserted into the girder gap portion. A method for seismic reinforcement of a bridge, characterized by disposing a filler.   2. A plurality of interlining units having connecting means attached to one side edge or both side edges are used, and inserted into the girder gap portion while sequentially connecting them. Seismic reinforcement method for bridges as described in 1.   After using a plurality of interfilling units having expansion means attached to the surface of each intersticing material, inserting them into the interstitial space, filling the interior of the expansion means, the expansion means The earthquake-proof reinforcement method according to claim 1, wherein the method is inflated. It consists of a filler unit inserted into the girder gap for the seismic reinforcement of the bridge and a guide holder attached to the abutment parapet or the end face of the girder ,
The padding material unit is constituted by a base plate, a padding material fixed to one surface of the base plate, and a connecting means for connecting adjacent padding material units .
The guide holder, together with the inter-filling material unit is slidable in the transverse direction of the bridge, for Retrofit of bridges to the vertical direction and wherein that you have been configured to restrict the movement of the Hashijiku direction Equipment . It consists of a filler unit inserted into the girder gap for the seismic reinforcement of the bridge and a guide holder attached to the abutment parapet or the end face of the girder ,
The filling material unit is composed of a filling material and an expansion means that can be expanded by injecting a filling material therein .
The guide holder, together with the inter-filling material unit is slidable in the transverse direction of the bridge, for Retrofit of bridges to the vertical direction and wherein that you have been configured to restrict the movement of the Hashijiku direction Equipment .