JP4280208B2 - Viaduct replacement method - Google Patents

Description

  The present invention relates to a viaduct replacement method.

In accordance with city planning, urban facilities and urban development projects are carried out in order to ensure the sound development and orderly development of the city.
Of the urban facilities, viaducts and roads need to be appropriately sized and arranged in consideration of current and future situations, and ensure smooth urban activities and a good urban environment.

By the way, in a city group with a large amount of traffic, the environmental deterioration represented by exhaust gas and noise caused by traffic congestion may impose a mental and physical burden on nearby residents and road users.
In addition, when constructing a viaduct replacement work, it is a matter of course that a wide range of traffic regulations are required at the site, and it is necessary to take measures such as reducing the number of lanes on the site road, which causes traffic congestion. For this reason, it is desired to alleviate the traffic jam and complete the construction in a short period of time.

  The present invention has been made in view of such a situation, and the problem to be solved is a technique that can alleviate at least traffic congestion and can complete the construction of a viaduct replacement in a shorter time than before. It is to provide.

  In order to solve the above-described problems, the present invention, the viaduct replacement method is an existing viaduct replacement method having a bridge pier portion and a girder bridge portion that is supported by the pier portion and serves as a passage for a vehicle. A step of constructing a pier portion of a turnover viaduct to avoid vehicle closure that may occur due to the construction of a replacement work, and the existing pier portion of the turnover viaduct A step of constructing an extension portion extending toward the bridge pier portion of the viaduct, a step of constructing a girder bridge portion of the viaduct for turning in the extending portion in a slidable state and constructing a viaduct for turning, and A step of removing the existing viaduct leaving the pier part, a step of connecting the remaining pier part and the extension part, and a girder of the viaduct for turning along the connected extension part And a step of sliding toward the pier the remaining portion of the portion of the existing viaduct.

  Therefore, according to the present invention, since the turning viaduct is constructed before the existing viaduct is replaced, the vehicle passes through the turning viaduct even during the removal work of the existing viaduct. Therefore, it is not necessary to make the vehicle closed during the removal work of the viaduct, so that it is difficult for traffic congestion to occur during the construction work.

  In addition, of the existing viaduct, the bridge pier part that is left without being removed and the bridge pier part of the turning viaduct are connected by an extension part, and the girder bridge part of the turning viaduct is connected along the extension part. Because it slides toward the remaining pier part, the existing viaduct can be easily replaced. In addition, since the girder bridge part of the turning road viaduct is used as the existing girder bridge part of the viaduct, it is not necessary to substantially remove the turning viaduct.

Therefore, according to the present invention, it is possible not only to prevent traffic jams, but also to complete the viaduct replacement work in a shorter time than before. In addition, since the girder bridge part of the turnover viaduct is used as the existing viaduct girder bridge part, the construction cost can be greatly reduced.

Hereinafter, embodiments of the present invention (hereinafter, embodiments) will be described with reference to the accompanying drawings.
The road viaduct replacement method according to the present invention is a method for renewing an existing highway viaduct girder bridge portion in an urban area.

FIG. 1 is an overall perspective view for explaining the concept of the replacement method according to the present invention, and shows that the construction progresses from the far side to the near side as opposed to FIG.
Specifically, area I in Fig. 1 shows the state before construction of road viaduct replacement work according to this method, and area II is turned around to construct road viaducts on both sides of the existing road viaduct, and It shows the state that the girder bridge part of the road viaduct of the road is lowered to the ground. Area III shows the state immediately before bringing them to the center of the road viaduct in order to divert the girder bridge of the road bypass viaduct to both sides of the existing road viaduct. The state after the girder bridge part of the highway viaduct is moved to the center is shown. In addition, illustration of the branch joint portion between the turning road viaduct and the existing highway viaduct is omitted.

This will be described in detail below.
As shown in FIG. 1, the highway viaduct denoted by reference numeral 1 is an existing one, and a bridge pier portion 3 as a substructure and a girder bridge portion as a superstructure that is supported by the pier portion 3 and serves as a passage for a vehicle. And 5.

  In the replacement method of the existing road viaduct according to the present invention, the road viaduct for turning is used so that the vehicles that have been passing through the highway viaduct 1 until the girder bridge portion 5 that is the superstructure is not completely closed. 100 is temporarily installed in parallel with the highway viaduct 1 before the girder bridge portion 5 is removed.

  Then, after removing the girder bridge portion 5 of the highway viaduct 1 from the pier portion 3, the girder bridge portion 105 of the turning road viaduct 100 is slid toward the pier portion 3 of the highway viaduct 1, and then the pier portion 3 The girder bridge portion 105 is turned around to form a new superstructure for the road viaduct 100 for use.

With reference to FIGS. 2 to 23, the procedure of the present construction method will be described step by step.
2 and 3 show a state before construction of the highway viaduct 1, which is a plan view and a cross-sectional view, respectively.

  The upper and lower lanes 11u and 11d of four lanes are laid on both sides of the girder bridge portion 5 of the highway viaduct 1 having upper and lower two lanes 5u and 5d, respectively. Further, sidewalks 13u and 13d are laid on the outside.

  4 and 5 show a state in which the bridge pier foundation and pillar of the newly constructed road viaduct for construction are constructed on the general road side of the sidewalks 13u and 13d by the well-known PC well construction method (note that the pier foundation and the pillar are generic names). And a pier portion is indicated by reference numeral 103). A plan view and a cross-sectional view are shown, respectively.

When constructing the pier part 103 of the turnover road viaduct 100, the upper and lower lanes are constructed simultaneously. At this time, the upper and lower lanes 11u and 11d of ordinary roads are closed to the two lanes on each side of the sidewalk. Depending on the progress of the construction, the road may be closed, and the road may be released or closed. There is. That is, depending on where the cross-section line is set, as shown in the cross-sectional view of FIG. 5, there are cases where the sidewalk-side two lanes are closed like the down road lane 11d on the general road and the road lanes 11u are closed like the general road. There is a case where it is not. However, the present invention is not limited to these. Of course, depending on the situation, either the down lane 11d or the up lane 11u of the general road may be closed to the front, and the other may be used in two lanes, upper and lower.

  6 and 7 show a state in which a steel beam 104 is constructed as an extending portion that is supported by the pier portion 103 of the turning road viaduct and extends horizontally from the pier portion 103 toward the highway viaduct 1. . Moreover, both figures show a plan view and a cross-sectional view, respectively.

  The steel beam 104 is supported at the distal end side by a temporary oblique column (hereinafter referred to as a diagonal member) 106 that temporarily receives the steel beam 104. By installing the diagonal member 106, the width of the two lanes becomes the vehicle width at the portion of the general road 11d or 11u where the diagonal member 106 is installed (see FIG. 7).

In addition, what is shown with the code | symbol 108 to the cross section of FIG. 7 is the scaffold for beam material connection for constructing the steel beam 104. FIG. The beam connecting scaffold 108 is removed together with the diagonal member 106 after the completion of the construction.
The steel beam 104 is installed by the crawler crane 200. In addition, the roads 11d or 11u on one side are constructed with one side being closed, but the other road 11u or 11d on the opposite side is used as one lane (in FIG. 7, the down lane 11d is on one side). Indicates a single lane.)

  FIGS. 8-10 is a figure which shows the state which has assembled the girder bridge part 105 of the highway bridge 100 for turning. The girder bridge portion 105 is formed by connecting a plurality of steel box girders 105 a in series (see FIG. 10). For example, a steel box girder having a length of 5 meters is assembled using the crawler crane 200. In performing the assembly, the steel box girder 105a is supported by the temporary support 107 (see FIGS. 9 and 10). In the assembly, the girder bridge portion 105 is mounted on the steel beam 104 so as to be slidable.

  The girder bridge portion 105 of the turnover road viaduct 100 will be used as a main building in the future. When construction is performed one side at a time and one side has been installed as a detour, the turning road viaduct 100 is opened and the route of the highway viaduct 1 is switched. In FIG. 9, the down line side is constructed first, the turning road viaduct 100 is used as the detour of the down line, and the lane 5d that has been the down line of the highway viaduct 1 is used as the up line. Indicates the state. In addition, the lane 5u, which was an up line until then, is closed on the highway viaduct 1. Even on ordinary roads, the entire up lane 11u is closed. Under this influence, the existing down lane 11d is used as an up lane and a down lane. Depending on the situation, there may be a case where both the up lane and the down lane of the highway viaduct 1 are not used but the lane on the side where the highway viaduct 1 is not constructed is used as one lane. .

  After the turning road viaduct 100 is opened on both the up and down sides, the highway viaduct 1 is then dismantled. This will be described with reference to FIGS. First, the dismantling of the highway viaduct 1 that reaches the intersection C of a general road will be described.

  In order to dismantle the highway viaduct 1, the girder bridge portion 5 that is the superstructure thereof is removed. In removing the girder bridge portion 5, the support bridge 50 temporarily receives the girder bridge portion 5. The support 50 is referred to as a superstructure temporary support 50 in this specification.

The assembly of the superstructure temporary support support 50 and the removal work of the girder bridge portion 5 are not performed in the entire area of the intersection C, but are performed in half areas in the construction progress direction. 11 to 13 are the first half of the construction, and FIGS. 14 to 16 are the second half of the construction. By doing in this way, the passage 52 of the crossing vehicle in the intersection C is ensured, and a full road closure is prevented (refer FIG. 13, 15).

  The crawler crane 200 is used for assembling the superstructure temporary support 50. Further, the girder bridge portion 5 supported by the superstructure temporary support 50 is disassembled with a wire saw (not shown) and then conveyed by a dump or the like. The girder bridge portion 5 may be provided with an overhang portion 5a as shown in FIG. 12, but by removing this first, a general road 11d located below the overhang portion 5a. Is wider than before removal (see FIGS. 12 and 15). In order to remove the overhanging portion 5a, an unillustrated overhanging support is assembled, and this is used as a scaffold and disassembled with a wire saw.

Next, the removal work of the part of the girder bridge part 5 that does not reach the intersection C will be described with reference to FIGS.
Also in this case, when the girder bridge portion 5 has the overhanging portion 5a, the overhanging portion 5a is first removed to widen the vehicle width of the general road. The dismantled overhanging part 5a is carried out via a highway.

  Next, the main body of the girder bridge portion 5 (hereinafter referred to as the girder bridge portion 5 unless otherwise specified) is removed. Also in this case, the superstructure temporary support 50A is assembled to support the girder bridge portion 5, but a number of jacks 55 are then provided and supported in cooperation (see FIG. 18).

  Next, the vicinity of the fulcrum between the pier part 3 and the girder bridge part 5 is cut with a wire saw. The girder bridge portion 5 divided from the pier portion 3 is supported by the superstructure temporary support support 50A and the jack 55, but the number of jacks 55 installed and the number of jacks per unit so that only the jack 55 can be sufficiently supported. Ability is determined. The reason why the girder bridge part 5 is not supported only by the jack is that the one stroke of the jack is much shorter than the length from the ground to the girder bridge part 5, and the support of the superstructure temporary support support 50A is not provided. Otherwise, the girder bridge portion 5 cannot be lowered substantially.

  While supporting the girder bridge portion 5 with the jack 55, the upper work temporary support support 50A is dismantled little by little from the top, and all the upper work temporary support support works 50A supporting the girder bridge portion 5 are divided into the planned dimensions. After dismantling (for example, about 30 centimeters) and when there is an interval corresponding to the planned dimension between the girder bridge portion 5 and the superstructure support support 50, the jack 55 supporting the girder bridge portion 5 is lowered. Then, the gap between the girder bridge portion 5 and the superstructure temporary support 50 is filled. In this way, the girder bridge portion 5 is lowered to the ground while the refilling of the girder bridge portion 5 by the combination of the superstructure temporary support 50A and the jack 55 is performed little by little (see FIGS. 18 and 19).

The lowered girder bridge portion 5 is cut with a wire saw on the ground, and then conveyed and disposed of by a dump or the like (see FIG. 19).
In this way, the highway viaduct 1 is removed, but the pier 3 remains. When the removal of the girder bridge portion 5 is completed, the remaining pier portion 3 and the steel beam 104 are connected (see FIGS. 20 and 21). It should be noted that a steel beam 104 is installed on the pier part 3 so that the girder bridge part 105 can easily slide, and other sliding means are provided.

  Next, the girder bridge portion 105 is slid along the steel beam 104 toward the pier portion 3 of the highway viaduct 1 (see FIGS. 20 and 21). The slide is performed on each side of the upper and lower lanes. At this time, the side of the girder bridge portion that is not the object of sliding is a one-sided lane so that the entire roadway of the highway viaduct 1 and the general roads 11u and 11d can be closed. Note that the general road on the slide side is closed on the construction side (see FIG. 21).

When the sliding is completed in both the upper and lower lanes, the diagonal member 106 and the removal scaffold 109 (see FIG. 23) are removed (see FIGS. 22 to 24). Also, pave the place where they were and the surrounding area.

FIG. 25 is a flowchart of the viaduct replacement method, and includes steps 1 to 8 (in the figure, symbol S means a step).
Step 1 is a step of constructing a pier portion 103 of a turning road viaduct parallel to an existing viaduct (see FIGS. 4 and 5).

  Step 2 is a step of constructing a steel beam 104 as an extending portion extending from the pier portion 103 of the turning road viaduct 100 toward the pier portion 3 of the existing highway viaduct 1 (FIG. 6). , 7).

  Step 3 is a step in which the girder bridge portion 105 of the turning road viaduct 100 is slidably mounted on the steel beam 104 to construct the turning road viaduct 100 (see FIGS. 8 to 10). .

Step 4 is a step of removing the highway viaduct 1 leaving its pier portion 3.
Step 5 is a step of dismantling the highway viaduct 1 approaching the intersection C (see FIGS. 11 to 16).

Step 6 is a step of removing the highway viaduct 1 at a place other than the intersection C leaving the pier portion 3 (see FIGS. 17 to 19).
Step 7 is a step of connecting the remaining pier part 3 and the steel beam 104 (see the figure).

  Step 8 is a step of sliding the girder bridge portion 105 of the turning road viaduct 100 toward the pier portion 3 of the highway viaduct 1 along the connected steel beam 104 (see FIGS. 20 to 24). ).

  According to the road viaduct replacement method according to the present embodiment, the turning road viaduct 100 is constructed prior to the replacement of the existing highway viaduct 1, so that the vehicle is turned around even during the removal of the highway viaduct 1. Pass through the public highway 100. Therefore, there is no need to make the vehicle closed. Therefore, it is difficult to cause traffic jams.

  Further, the pier portion 103 of the turning road viaduct 100 and the pier portion 103 which is left without being removed in the highway viaduct 1 are connected by a steel beam 104 and are turned along the steel beam 104. Since the girder bridge portion 105 of the highway viaduct 100 is slid toward the remaining pier portion 103 of the highway viaduct 1, the highway viaduct 1 can be easily replaced. In addition, since the girder bridge portion 105 of the turning road viaduct 100 is used as the girder bridge portion 105 of the existing highway viaduct 1, after the replacement of the highway viaduct 1 is finished, The above removal is unnecessary.

  Therefore, in this embodiment, not only can traffic congestion be prevented, but the replacement work for the highway viaduct 1 can be completed in a shorter time than before. Moreover, since the girder bridge portion 105 of the turnover road viaduct 100 is used as the girder bridge portion 105 of the highway viaduct 1, the construction cost can be greatly reduced.

  In addition, this invention is not limited only to the above-mentioned illustration example, Of course, various changes can be added within the range which does not deviate from the summary of this invention. For example, the number of lanes is not limited to those exemplified in the embodiment.

It is a whole perspective view for demonstrating the concept of the replacement method of the road viaduct concerning this invention. It is a top view of the highway viaduct before construction of the viaduct replacement construction by the viaduct replacement method according to the present invention and its periphery. It is the sectional view on the AA line of FIG. It is a top view after the construction start of the viaduct replacement work by the viaduct replacement method concerning this invention, Comprising: It is a top view which shows the state which has constructed the pier part of the road viaduct for turning. It is the BB sectional view taken on the line of FIG. It is a top view which shows a state when the steel beam attached to a pier part is supported by the diagonal. It is CC sectional view taken on the line of FIG. It is a top view which shows a state when installing the steel box girder in the steel beam. It is the DD sectional view taken on the line of FIG. FIG. 10 is a side view of FIG. 9. It is a top view which shows the removal state in the intersection part of a general road and a high speed road viaduct. It is the EE sectional view taken on the line of FIG. It is a side view of FIG. It is a top view in the state where removal work progressed about half at the intersection. It is the FF sectional view taken on the line of FIG. FIG. 16 is a side view of FIG. 15. It is a top view for demonstrating the state which has lowered | hung the girder bridge part of a high speed road viaduct to the ground by jackdown. It is the GG sectional view taken on the line of FIG. It is a side surface of FIG. It is a figure for demonstrating the state which slides the girder bridge part of a turning road viaduct toward the pier part of a highway viaduct. It is the HH sectional view taken on the line of FIG. It is a top view which shows the state which slid the girder bridge part of the turning road viaduct on both sides of the upper and lower lanes. It is the II sectional view taken on the line of FIG. It is the II sectional view taken on the line which shows the state which removed the diagonal material and the scaffold for the removal, and the replacement work of the viaduct by this method was completed. It is a flowchart of the replacement construction method of a viaduct.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Expressway viaduct 3 Bridge pier part 5 Girder bridge part 5a Overhang | projection part 5d Down lane 5u Up lane 11d General road down lane 11u General road up lane 50 Superstructure temporary acceptance support construction 50A Superstructure provisional acceptance support construction 52 Crossing vehicle passage 55 Jack 100 Road Bypass Via 103 103 Pier 104 Steel Beam (Extension)
105 Girder bridge portion 105a Steel box girder 106 Diagonal material 107 Temporary support work 108 Beam material connection scaffold 109 Diagonal material removal scaffold 200 Crawler clay C Intersection I Area II Area III Area IV Area

Claims (4)

In the existing viaduct replacement method, which has a pier part and a girder bridge part that is supported by this pier part and serves as a passage for vehicles,
Constructing a pier portion of a turnover viaduct for bypassing the vehicle and avoiding vehicle closure that may occur due to the construction of replacement work in parallel with the existing viaduct; and
Constructing an extension extending from the pier portion of the turnover viaduct toward the existing viaduct pier portion;
A step for constructing a viaduct for turning by mounting the girder bridge portion of the viaduct for turning in this extended state in a slidable state,
Removing the existing viaduct leaving its pier part; and
Connecting the remaining pier part and the extension part;
And a step of sliding the girder bridge portion of the turnover viaduct toward the remaining pier portion of the existing viaduct along the connected extension portion. In an existing road viaduct replacement method having a pier part and a girder bridge part that is supported by this pier part and serves as a passage for vehicles,
Constructing a pier portion of a turnover road viaduct for bypassing the vehicle and avoiding vehicle closure that may occur due to the construction of the replacement work in parallel with the existing road viaduct; and
Constructing an extending portion extending from the pier portion of the turning road viaduct toward the pier portion of the existing road viaduct;
A step of constructing a road viaduct for turning by slidably mounting a girder bridge portion of the road for bypassing on the extension portion,
Removing the existing road viaduct leaving its pier part;
Connecting the remaining pier part and the extension part;
A method of replacing the road viaduct with a step of sliding the girder bridge portion of the turning road viaduct along the connected extension portion toward the remaining pier portion of the existing road viaduct.   A method for replacing a road viaduct according to claim 2, wherein the method for replacing the road viaduct in the upper and lower lanes of an existing road viaduct is used.   The road according to claim 2 or 3, wherein when the existing road viaduct is dismantled leaving its pier part, the girder bridge part is lowered with a jack and the girder bridge part is dismantled on the ground. Replacement method for viaduct.

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