JP6234976B2 - Bridge construction method - Google Patents

Description

  The present invention relates to a method for constructing a bridge constructed in a river.

  Currently, there are many existing bridges built in rivers that are approaching the deadline for the preset useful life. Therefore, at present, replacement works are being carried out in order to replace many existing bridges that are said to be nearing their deadlines with new bridges.

  When performing such replacement work, construct a temporary bridge once in another location, and then withdraw it by demolishing an existing bridge that has become aged, and construct a new bridge at the location where it was removed. It is common to go through a procedure such as removing the temporary bridge later. And most of the newly built new bridges are now made of concrete (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-055131

  However, as described above, in addition to the current situation where there are many existing bridges that require replacement, a large construction period and work amount are required for each individual replacement work in order to go through the above procedure. Under such circumstances, with a limited amount of work, the replacement work could not catch up, so the replacement work could not be carried out before the end of its useful life, and existing bridges that were aged were generated There is also concern about the problem of letting it go.

  Moreover, in order to guarantee the required traffic during the above-mentioned replacement work, not only new bridges to replace existing bridges but also temporary bridges to be used when constructing the new bridges are assumed. As described above, rapid construction and withdrawal are required as well as providing strength that can effectively withstand the load caused by the passing of vehicles.

  This invention pays attention to such a malfunction, and it aims at providing the construction method of the bridge which has a high intensity | strength and can perform quick construction and withdrawal.

  In order to achieve such an object, the present invention takes the following measures.

That is, the bridge construction method according to the present invention is a precast concrete product having a top plate extending over the entire area between the river banks sandwiching the river and made of a plurality of concrete members at a location separated from the existing bridge built in the river. A temporary bridge construction process for constructing a temporary bridge , a detour circuit construction process for branching from an existing road so as to be continuous with a temporary road surface that is an upper surface of the temporary bridge, the temporary bridge construction process, and the detour circuit An existing bridge removal process for removing the existing bridge from the river after providing the detour via a construction process, and a provisional vehicle that can pass through the place where the existing bridge is removed after the existing bridge removal process is completed. a provisional bridge construction step of forming a bridge, after the vehicle on the provisional bridges to the provisional bridge construction process is complete is adapted to traffic, the said provisional bridges The precast concrete products using at least a portion of said concrete member configured to設橋beam A construction method of a bridge and a new bridge construction step of applying a new bridge by continuously provided, the precast concrete products, the bottom plate And a box culvert provided with a side plate raised from the bottom plate and the top plate provided between the side plates. The box culvert is prestressed in the joining direction of the plurality of concrete members. The temporary bridge has no time to block the road at a position close to the upstream side or the downstream side of the existing bridge before the temporary bridge constituting the newly installed bridge is installed in the river. It is constructed to ensure constant traffic, and the new bridge is constructed wider than the existing bridge. It is intended.

  Here, it is needless to say that the “location where the existing bridge has been removed”, which is the location where the new bridge is constructed, is not necessarily the same as the location where the existing bridge was installed. That is, it is a matter of course that a case where at least a part of a place where a new bridge is installed overlaps all or a part of a place where an existing bridge is installed is included. In addition, in the case of the present application, not only in the above case, but also if the location where the new bridge is constructed is close enough to be unable to construct due to the presence of the existing bridge, the construction location of the new bridge and the existing bridge will be mutually It is a concept that is included in the “location where the existing bridge has been removed” even if it does not overlap.

  If this is the case, using precast concrete products can contribute to shortening the construction period by realizing rapid construction while avoiding unnecessary increase in construction scale, but also has high strength and durability. It is possible to provide an excellent bridge. In addition, the use of precast concrete products means that withdrawal after temporary bridge construction can be performed quickly. In particular, the bridge construction method according to the present invention can greatly reduce the number of unnecessary temporary materials by reducing the number of unnecessary temporary materials by using the concrete members used for the temporary bridge as they are for the construction of the new bridge. Contributes to reduction. That is, according to the present invention, it is possible to provide a bridge construction method that can contribute to shortening the construction period while avoiding an increase in construction scale.

And the precast concrete product for suitably constructing the bridge erected in the river is a box culvert provided with a bottom plate, a side plate raised from the bottom plate, and a top plate provided between the side plates. .

Also, in order to integrate a precast box culvert having a plurality of concrete members and further effectively improve the strength of the bridge, the precast box culvert is prestressed in the joining direction of the plurality of concrete members. doing.

  Furthermore, in order to be able to perform the process after construction of the temporary bridge more quickly and labor-saving, the concrete member movement that moves the concrete member constituting the temporary bridge to the place where the existing bridge was removed by the existing bridge removal process. It is desirable that the step of moving the concrete member is a step of sliding the concrete member on the foundation from the location where the temporary bridge is constructed to the location where the existing bridge is removed. Thereby, it contributes also to labor saving of the labor concerning construction by reducing the use frequency or use time of heavy machinery, such as a crane for moving a concrete member.

  ADVANTAGE OF THE INVENTION According to this invention, the construction method of the bridge which can contribute to shortening of a construction period can be provided, avoiding the increase in a construction scale.

The external view which concerns on one Embodiment of this invention. A figure explaining one process concerning the embodiment. Same as above. Same as above. The enlarged view of the principal part which concerns on the same embodiment. A figure explaining one process concerning the embodiment. Same as above. FIG. 8 is a schematic cross-sectional view corresponding to FIG. 7. Operation | movement explanatory drawing which concerns on FIG. Same as above. Same as above. Same as above. Same as above. The external view corresponding to the process which concerns on FIG. A figure explaining one process concerning the embodiment. The enlarged view of the principal part which concerns on the modification of the embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The construction method of the bridge according to the present embodiment is, for example, an existing bridge B as shown in FIG. 1 installed in a so-called small and medium river R having a distance between both river banks R2 of less than 15 m as shown in FIG. This is to quickly and smoothly carry out the replacement work for the new bridge NB. Since this existing bridge B shown in FIG. 1 is an existing bridge that is about to expire, the detailed description thereof will be omitted. In addition, after removing the existing bridge B shown in the figure, until the new bridge NB shown in FIG. 15 is newly installed on the river R, the road is located close to the upstream side or downstream side of the target existing bridge B. A temporary bridge TB as shown in FIG. 6 and FIG. 7 is used as a temporary bridge that is temporarily constructed so as to guarantee continuous traffic without providing a time to block the road.

  As shown in FIG. 1, the river R has a riverbank R2 provided with concrete made in the field in the vicinity of the existing bridge B, and gravel etc. is normally arranged on the riverbed R1. Of course, although water flows from the upstream to the downstream while maintaining a constant water level in the river R, the water is not shown in the figure.

  As shown in FIGS. 14 and 15, the new bridge NB includes a box culvert 1 which is a precast concrete product, and a road surface forming portion 4 for forming a road surface 40 on the upper surface 16 side of the top plate 13 of the box culvert 1. The ground cover 9 is the same as a normal bridge at both ends. In the present embodiment, the road surface forming portion 4 is made of, for example, asphalt or concrete that is normally provided to form a road surface 40 that allows a vehicle or the like to pass through the upper surface 16 suitably. In the present embodiment, the road surface forming portion 4 formed in a single layer is illustrated, but of course, a road surface sign required for road traffic is separately provided on the road surface 40, or a median strip or illumination lamp is separately installed. For example, various modes can be applied. Further, since the existing configuration can be applied as appropriate to the configuration of the ground cover 9, detailed description is omitted. The road surface 40 is continuous with the existing road H1 on the riverbank R2 side so that a vehicle or the like can appropriately travel on the road surface 40 that is the upper surface of the road surface forming portion 4.

  As shown in FIGS. 6 to 12, the temporary bridge TB includes a box culvert 1 similar to the above, a temporary road forming portion 5 for forming a temporary road surface 50 on the upper surface 16 side of the box culvert 1, and the temporary road. And guard rails GR provided at both ends of the forming portion 5. The temporary road forming section 5 is made of a metal plate or precast concrete so that it can be completely separated from the box culvert 1 so that the work from the construction of the temporary bridge TB described later to the construction of the new bridge NB can be performed quickly. It is made up of In the present embodiment, the temporary path forming portion 5 formed in a single layer shape is illustrated in FIGS. 6 to 12. Of course, since the existing configuration can be applied to the configuration of the temporary path forming portion 5, a detailed description is given. Description is omitted. And the temporary road surface 50 is following the detour H2 provided in the riverbank R2 side so that vehicles etc. can come and go on the temporary road surface 50 which is the upper surface of this temporary road formation part 5 suitably.

  And as above-mentioned, the box culvert 1 used for the new bridge NB and the temporary bridge TB has the fundamentally same structure.

  As shown in FIGS. 4 to 15, the box culvert 1 includes a bottom plate 11, a side plate 12 raised from the bottom plate 11, and a top plate 13 provided between the side plates 12. It is a concrete secondary product with a shape. The box culvert 1 has a plurality of concrete members 2 divided along the extending direction of the river R. In this embodiment, the box culvert 1 is configured by connecting four or eight concrete members 2 having the same shape in plan view, but of course, the number and dimensions of the concrete members 2 may be changed as appropriate. Can do. Each of the plurality of concrete members 2 has a substantially U-shaped horizontal member 20 which is arranged at both upper and lower ends and can constitute the bottom plate 11 or the top plate 13 and a part of the side plate 12, and the horizontal member 20 It has standing members 21 that are erected on both ends and can constitute a part of the side plate 12, and these horizontal members 20 and the standing members 21 are separately carried into the river R that is the construction site. Thereafter, the horizontal member 20 and the standing member 21 are bonded prior to the bonding between the concrete members 2. In the present embodiment, the upper side of the horizontal member 20 located on the upper side is the support surface 22 to which the load from the road surface 40 is transmitted.

  In the present embodiment, as shown in FIG. 8, when the box culvert 1 is constructed, a foundation SC is provided on a support layer S mainly made of crushed stone. The foundation SC has a foundation concrete SC1 made of cast-in-place concrete, and a surface steel material SC2 made of H steel arranged with the upper surface exposed from the inside of the foundation concrete SC1. The surface steel material SC2 is disposed at an angle of 90 ° from the H-shaped direction, so that any plane is slightly raised from the upper surface of the foundation concrete SC1. The box culvert 1 is arranged on the basic SC. Here, by providing the surface steel material SC2 so as to be higher than the foundation concrete SC1, the subsequent movement of the concrete member 2 can be performed more smoothly as will be described later.

  Further, the bottom plate 11 of the box culvert 1 can be the river bottom forming surface 15 because the river bottom R1 is made of earth or sand or cast-in-place concrete up to a height equal to the upper surface after the construction of the new bridge NB. The side plate 12 is erected upward from both sides of the bottom plate 11, and after the construction of the new bridge NB, the side plate 12 can be a river bank forming surface 19 whose inward surface is substantially flush with the river bank R2. In the present application, for the sake of convenience of explanation, the riverbed forming surface 15 and the riverbank forming surface 19 are also illustrated in the drawings other than the new bridge NB. In the present embodiment, concrete is formed thick in a partial area on the inner surface side between the bottom plate 11 and the side plate 12 and between the side plate 12 and the top plate 13 so that the shape thereof is inclined. By doing so, a haunch 1h is provided. Further, in the present embodiment, a duct 14 for forming a tightening portion is formed in order to pass a tension material such as a PC steel material (not shown) through the haunch 1h.

  In the present embodiment, the tightening portion uses a total of four ducts 14 provided in the haunch 1h, for example, using PC steel, draws the concrete members 2 together, and compresses the concrete members 2 together. It is for introducing stress. In this specification and the drawings, only the duct 14 provided in the haunch 1h for attaching the tightening portion is shown, and the nut and other accommodation holes are not shown. Although the illustration and detailed description of this tightening part are omitted, the PC steel material, a plate for inserting the PC steel material, and a nut screwed to the end of the PC steel material to press the plate are shown as an example. It is an existing one with.

  In the present embodiment, prestress is applied by the tightening portion to the plurality of concrete members 2 arranged on the foundation SC at least when the new bridge NB is constructed. Thereby, the laying of the box culvert 1 having a high strength is almost completed. Of course, prestress may be applied in the same manner even when the temporary bridge TB is constructed.

  Thus, the bridge construction method according to the present embodiment has a top plate 13 that is made of one or a plurality of concrete members 2 and extends across the entire area between the two river banks R2 across the river R at a location separated from the existing bridge B. At least one of the temporary bridge construction process ST4 for constructing the temporary bridge TB having the box culvert 1 as the precast concrete product, the existing bridge removal process ST6 for removing the existing bridge B from the river R, and the concrete member 2 constituting the temporary bridge TB. And a new bridge construction process ST11 for constructing the new bridge NB having the box culvert 1 used in the section at a location where the existing bridge B is removed.

  Hereinafter, each step of the construction method will be described with reference to FIGS. 1 to 15 again in order to explain the construction method of the bridge according to the present embodiment. As described above, the construction method includes the temporary bridge construction process ST4, the existing bridge removal process ST6, and the new bridge construction process ST11 as essential processes. However, in order to further save labor and speed up the construction, A concrete member moving step ST10 to which a so-called construction method is applied is included. In this embodiment, in addition to the above-described steps, the foundation construction step ST1, the temporary member placement step ST2, the riverbank treatment step ST3, the detour route construction step ST5, the foundation extension step ST7, and the new member placement step ST8. And 11 steps including 7 steps such as provisional bridge construction step ST9. 2-14, in order to prevent water from flowing into the construction site by blocking the flow of water flowing through the river R in advance or by diverting it to another location, the construction is performed. The description about is omitted.

  As shown in FIGS. 2 and 3, the foundation construction process ST1 is a process of excavating a part of the concrete and the river bottom R1 constituting both riverbanks R2, and constructing the foundation SC on the river bottom R1. Thereby, riverbank R2 will be in the state where earth and sand D were exposed. In FIG. 3, only the structure of the foundation SC appears, but it goes without saying that a support layer S made of crushed stone or the like is disposed under the foundation SC as shown in FIGS.

  As shown in FIG. 4, the temporary member placement step ST2 is placed so that a plurality of, in the drawing, four concrete members 2 are arranged on the foundation SC that has been constructed. In this step, the box culvert 1 is provided on the base SC. In the figure, a construction method is applied in which the horizontal member 20 and the standing member 21 constituting each concrete member 2 are sequentially placed and connected by a crane.

  In the riverbank processing step ST3, as shown in FIG. 5, a sandbag SB is laid between the box culvert 1 and the earth and sand D so that the earth and sand D exposed on the riverbank R2 can be quickly destroyed. It is a process to keep. Here, by using the sandbag SB, the removal work can be speeded up, and the concrete member moving step ST10 for moving the temporary bridge TB can be promptly shifted. Also, if the riverbank treatment step ST3 is a step of placing on-site concrete or mortar on the surface of the earth and sand D instead of using the sandbag SB, the cement and mortar are classified as industrial waste that requires disposal after withdrawal. turn into. That is, the use of sandbag SB not only contributes to the rapid progress of construction, but also contributes to effective reduction of industrial waste emissions.

  In the temporary bridge construction step ST4, as shown in FIG. 6, the above-mentioned temporary road forming portion 5 and the guard rail GR are installed on the box culvert 1 installed on the foundation SC, and the vehicle is moved on the top plate 13 of the box culvert 1. This is a step of providing a temporary bridge TB that can be passed through. Of course, in the temporary bridge construction step ST4, prestress may be applied by using a tightening portion by using a place where the duct 14 of the box culvert 1 composed of a plurality of connected concrete members 2 is provided.

  As shown in FIG. 6, the detour construction step ST5 is a step of providing a detour H2 so as to branch from the existing road H1 and continue to the temporary road surface 50 that is the upper surface of the temporary bridge TB. As shown in the figure, the process may be performed in parallel with the temporary bridge construction process ST4 or may be performed prior to the process.

  In the existing bridge removing step ST6, the existing bridge B is removed and the existing bridge B is removed from the location where the temporary bridge TB is constructed, as shown in FIG. This is a process of excavating the riverbank R2 and the riverbed R1 to the place where the foundation SC has been removed so that the foundation SC can be constructed.

  As shown in FIG. 9, the foundation extension process ST7 is a process of constructing a new foundation SC from the edge of the foundation SC already supported to support the temporary bridge TB to the place where the existing bridge B is removed. is there. In other words, it is a process of extending the foundation SC to the place where the existing bridge B is removed. In the present embodiment, a region in which the surface steel material SC2 made of H steel is disposed in the foundation SC is defined as a horizontally pullable region SC3. In addition, although the surface steel material SC2 is not indispensable at the time of the horizontal drawing method mentioned later, the concrete member 2 can be slid and moved labor-saving accurately by the presence of the exposed metal surface. In other words, by using the metal surface, it is possible to suitably use an existing transport carriage that can suitably slide and move the concrete member 2. Specifically, since the rotating portion, which is the traveling portion of the transport carriage, can move accurately along the metal surface on the upper surface of the metal surface, the transport carriage on which the concrete member 2 is placed is made concrete and labor-saving accurately. The member 2 can be transported. Further, since various existing carriages can be applied, detailed description is omitted.

  The new member placing step ST8 is a step of placing the concrete member 2 that is newly required for the construction of the new bridge NB, as shown in FIG. Although not shown in the present embodiment, the process is a process of placing from above using the same crane as shown in FIG.

  As shown in FIG. 11, the provisional bridge construction process ST9 is performed by providing the road surface forming portion 4, the ground cover 9, and the guard rail GR on, for example, four concrete members 2 newly placed for the construction of the new bridge NB. This is a step of temporarily providing a temporary bridge PB that allows a vehicle or the like to pass over the top plate 13 of the box culvert 1. Of course, in the provisional bridge construction step ST9, prestress may be applied by using a tightening portion using a location where the duct 14 of the box culvert 1 composed of a plurality of connected concrete members 2 is provided.

  The concrete member moving step ST10 is a step for moving the concrete member 2 constituting the temporary bridge TB as shown in FIG. Specifically, in the step, first, when prestress is applied to the box culvert 1 constituting the temporary bridge TB, the prestress is released. After that, the concrete member 2 constituting the temporary bridge TB using a winch or the like (not shown) is slid on the laterally drawable area SC3, for example, in a state where the concrete member 2 is placed on the transfer carriage (not shown). And all the concrete members 2 constituting the temporary bridge PB are connected.

  As shown in FIGS. 13 to 15, the new bridge construction process ST <b> 11 provides a box culvert 1 by newly providing a road surface forming portion 4 and a ground cover 9 on a box culvert 1 composed of eight concrete members 2 arranged in series. This is a step of providing a new bridge NB that allows a vehicle or the like to pass over the top plate 13. In addition, prior to the construction of the road surface forming portion 4 and the ground cover 9, prestressing should be applied using the tightening portion using the place where the duct 14 of the box culvert 1 made of these eight concrete members 2 is provided. Needless to say.

  14 and 15, in this embodiment, the detour H2 shown in FIG. 7 is removed and the road surface of the new bridge NB in parallel with or before or after the new bridge construction process ST11. A new road H <b> 3 is provided so as to continue to 40. In this way, the new bridge NB, which is wider than the existing bridge B and provided with a sidewalk, is quickly and labor-savingly constructed at the location where the existing bridge B is installed.

  As described above, according to the bridge construction method according to the present embodiment, by using the box culvert 1 which is a precast concrete product, it is possible to realize a rapid construction while avoiding an unnecessary increase in the construction scale. In addition to being able to contribute to the shortening of the building, the provision of a new bridge NB with high strength and excellent durability has been realized. In addition, the use of precast concrete products means that the temporary bridge TB can be quickly withdrawn. Also, by effectively reducing the generation of unnecessary waste that occurred when the existing temporary bridge was withdrawn, the effort to withdraw the waste and the burden on the environment were effectively reduced.

  In particular, in this embodiment, the concrete member 2 used for the temporary bridge TB is used as it is for the construction of the new bridge NB, thereby greatly reducing the number of unnecessary temporary materials, further shortening the construction period and reducing labor. Realized. That is, according to the embodiment, the construction of the bridge that can contribute to the shortening of the construction period while avoiding the increase in the construction scale is realized.

  In this embodiment, as a precast concrete product, a box culvert 1 having a substantially annular shape including a precast bottom plate 11, a side plate 12 raised from the bottom plate 11, and a top plate 13 provided between the side plates 12 is used. By using it, not only quick carry-in but also a strong temporary bridge TB and a new bridge NB are realized.

  Further, in the present embodiment, a mode in which prestress is applied in the joining direction of the plurality of concrete members 2 is applied in order to further effectively improve the durability and strength of the bridge.

  Furthermore, in order to be able to perform the process after the temporary bridge TB construction more quickly and labor-saving, in the present embodiment, the concrete member moving process ST10 is moved by a horizontal pulling method that slides on the foundation SC. . As a result, the use of heavy machinery such as a crane CR for moving the concrete member 2 is saved, thereby saving labor in construction. In particular, the use of the crane CR means that it takes time and labor to cancel the joining of the horizontal member 20 and the standing member 21 in the concrete member 2, but by avoiding the use of the crane CR, such a joint release can be avoided. Save time and effort.

<Modification>
A modification of the above embodiment will be described below. In this modification, the same reference numerals are given to the components corresponding to the constituent elements of the above-described embodiment, and the detailed description thereof is omitted.

  In the above embodiment, when the temporary bridge TB is constructed, the temporary road surface 50 is provided by installing the temporary road forming part 5 on the top surface of the top plate 13 of the box culvert 1. However, the temporary road forming part 5 and the temporary road surface 50 are provided. It is also effective to extend the erection plate F from the riverbank R2 side so as to be continuous with the upper surface of the top plate 13 so that it can be more easily installed. In order to easily apply such a mode, a plate receiving base 10 may be provided in the vicinity of the edge portion of the top plate 13 of the box culvert 1.

  That is, as shown in FIG. 16, the modified example is one in which the top plate 13 is adjacent to the construction plate F for connecting the temporary road surface 50 to the riverbank R2 side at both ends in the extending direction. Is a mode in which the plate support 10 that supports the end portion of the installation plate F from below is integrally formed. In the same figure, the mode which made the plate stand 10 function to temporary bridge TB is shown. As described above, this configuration makes it easy to eliminate unnecessary steps between the temporary road surface 50 on the temporary bridge TB and the bypass H2 on the riverbank R2 side connected to the temporary road surface TB, and effectively improves the performance of the temporary bridge TB. it can. In the same figure, the space formed between the receiving surface 10a, which is the upper side of the plate receiving base 10, and the lower surface of the end portion of the erection plate F is spaced slightly between the receiving surface 10a and the surface of the erection plate F. In order to adjust unevenness, in other words, unevenness, an interposition member 8 made of a buffer material such as urethane is provided. And in the aspect of the figure, it is the highly elastic adhesive 7 with respect to the space spaced apart in the surface direction formed on the plate receiving stand 10 between the end surface of the top plate 13 and the end surface of the installation plate F. Filled. However, as a matter of course, a bituminous material mainly composed of asphalt used in normal road construction may be used in place of the highly elastic adhesive 7.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  The movement of the concrete member used for the temporary bridge is not limited to the movement by the horizontal pulling method, but may be movement by a heavy machine such as a crane. In that case, it is not necessary to provide a foundation used exclusively for horizontal pulling between the construction site of the temporary bridge and the construction site of the new bridge. Further, there may be a case where a new bridge having a road width from the position where the concrete member used for the temporary bridge is installed to the position where the existing bridge is installed is wider than the existing bridge. In such a case, there may be a case where a new bridge can be constructed without moving any concrete member used at the time of constructing the temporary bridge.

  Moreover, although the aspect in which only the top plate of the precast concrete product is temporarily installed in the river is disclosed exclusively for the above-mentioned new bridge, the new bridge may be constructed by using some concrete made on the spot and other structures. That is, the concrete member used for the temporary bridge may be used for at least a part of the new bridge. On the other hand, the aspect in which all of the concrete members used in the new bridge are constituted by all or part of the concrete members used in the temporary bridge is not disturbed. Furthermore, in the said embodiment, although the shape of each concrete member was made into the same shape for convenience of explanation, of course, the shape of a concrete member is good also as a mutually different shape in view of the shape of a river. In addition, specific aspects such as a configuration for tightening a plurality of concrete and specific locations and procedures for tightening are not limited to those in the above-described embodiment, and various aspects including existing ones may be used. Can be applied.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used as a method for constructing a bridge constructed in a river.

ST4 ... Temporary bridge construction process ST6 ... Existing bridge removal process ST10 ... Concrete member movement process ST11 ... New bridge construction process 1 ... Precast concrete product (box culvert)
11 ... Bottom plate 12 ... Side plate 13 ... Top plate 14 ... Duct 2 ... Concrete member R ... River R2 ... River bank B ... Existing bridge TB ... Temporary bridge NB ... New bridge SC3 ... Horizontal pullable area

Claims (2)

A temporary bridge construction process for constructing a temporary bridge having a precast concrete product having a top plate extending over the entire area between both riverbanks sandwiching the river at a location apart from the existing bridge built in the river; ,
A detour construction process for branching from an existing road and providing a detour so as to continue to the temporary road surface which is the upper surface of the temporary bridge;
An existing bridge removing step of removing the existing bridge from the river after providing the detour via the temporary bridge construction step and the detour construction step ;
After the existing bridge removal process is completed, a provisional bridge construction process for providing a provisional bridge through which a vehicle can pass at a location where the existing bridge is removed;
After such a vehicle on the provisional bridges to the provisional bridge construction process is completed may passage, continuously provided a precast concrete product using at least a portion of said concrete member obtained by forming the temporary bridge to the provisional bridge a construction method of a bridge and a new bridge construction step of applying a new bridge by,
The precast concrete product is a box culvert having a bottom plate, a side plate raised from the bottom plate, and the top plate provided between the side plates, and the box culvert is a joint of a plurality of the concrete members. Prestressed in the direction,
The temporary bridge ensures continuous traffic without providing a time to block the road at a position close to the upstream side or the downstream side of the existing bridge until the temporary bridge constituting the newly constructed bridge is installed in the river. It is constructed to be able to
A bridge construction method in which the new bridge is constructed with a wider road than the existing bridge. A concrete member moving step of moving the concrete member constituting the temporary bridge to a location where the existing bridge is removed by an existing bridge removing step;
The bridge construction method according to claim 1, wherein the concrete member moving step is a step of sliding the concrete member on a foundation from a location where the temporary bridge is constructed to a location where the existing bridge is removed.

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