Bridge construction methods

Abstract

To provide a construction method for a bridge capable of being constructed in a short period.SOLUTION: A construction method for a bridge 10, constructed between a first abutment 2 and a second abutment 3, comprises a temporary material installation step of bridging a plurality of temporary materials 1 between the first abutment 2 and the second abutment 3, a placing step for placing a plurality of bridge blocks 8 constituting the bridge 10 on the plurality of temporary materials 1, and an integration step for integrating the plurality of bridge blocks 8 placed on the plurality of temporary materials 1. In the temporary material installation step, a tendon is laid between the first abutment 2 and the second abutment 3 as each of the plurality of temporary materials 1, and in the integration step, the plurality of bridge blocks 8 are tensioned by the plurality of temporary materials 1 to integrate the plurality of bridge blocks 8.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a construction method for bridges such as girder bridges and arch bridges.

Background Art

[0002] Patent Document 1 describes a method for constructing a concrete floating pier bridge. In this method for constructing a concrete floating pier bridge, a plurality of concrete block bodies are loaded onto a launching barge or a land quay wall using a crane, and on the launching barge or the land quay wall, the end faces of the block bodies are adhered and integrated with an adhesive, prestress is introduced by tensioning with PC steel wires, the launching barge is sunk or lifted and lowered from the land using a crane, and towed to the installation location as necessary to construct the floating pier bridge.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The construction method for a concrete floating pier bridge described in Patent Document 1 requires numerous steps, including preparing a launching barge, installing a crane to load the block bodies onto the launching barge, loading the block bodies onto the launching barge using the crane, removing the crane, sinking the launching barge, and removing the launching barge. Furthermore, numerous steps are required, such as installing a crane to load the block bodies onto the land quay, loading the block bodies onto the land quay using the crane, removing the crane, installing a crane to lower the block bodies from the land quay, lowering the block bodies from the land quay using the crane, and removing the crane. In other words, it is necessary to move the integrated block bodies to the construction location of the floating pier, and there are also many steps involving cranes. Therefore, there is a problem in that the construction period cannot be sufficiently shortened.

[0005] Therefore, the object of the present invention is to provide a bridge construction method that can be completed in a short period of time. [Means for solving the problem]

[0006] [1] The bridge construction method according to the present invention is a bridge construction method for a bridge erected on a first abutment and a second abutment, comprising: a temporary material installation step of bridging a plurality of temporary materials between the first abutment and the second abutment; a placement step of placing a plurality of bridge blocks constituting the bridge on the plurality of temporary materials; and an integration step of integrating the plurality of bridge blocks placed on the plurality of temporary materials.

[0007] In this bridge construction method, multiple temporary materials are stretched between the first and second abutments, and multiple bridge blocks are placed on these temporary materials. These bridge blocks are then integrated, allowing the placement and integration of multiple bridge blocks to be done at the bridge construction site. In other words, there is no need to move the integrated bridge blocks to the bridge construction site. Therefore, construction can be completed in a short period of time.

[0008] [2] In the bridge construction method described in [1] above, in the temporary material installation process, tensioning members may be placed between the first abutment and the second abutment as each of the multiple temporary materials, and in the integration process, multiple bridge blocks may be integrated by tensioning multiple bridge blocks with multiple temporary materials. In this bridge construction method, since multiple bridge blocks are integrated by tensioning multiple bridge blocks with tensioning members used as each of the multiple temporary materials, the period of the integration process can be further shortened. In addition, since multiple temporary materials can be used as permanent materials and prestress can be introduced into the bridge by multiple temporary materials, the construction period can be further shortened. Moreover, since the tensioning members used as each of the multiple temporary materials are placed on the outside of the bridge, the tensioning members can be visually inspected from the outside. For this reason, maintenance of the tensioning members can be easily performed even after the bridge is constructed.

[0009] [3] In the bridge construction method described in [2] above, the bridge block may have a recess for hooking onto each of the multiple temporary materials. In this bridge construction method, since the bridge block has a recess for hooking onto each of the multiple temporary materials, the bridge block can be easily and stably placed on the multiple temporary materials.

[0010] [4] In the bridge construction method described in [2] or [3] above, each of the multiple bridge blocks has a mounting surface that is placed on each of the multiple temporary materials and a floor surface that will be the traffic surface of the bridge, and in the temporary material installation process, the multiple temporary materials are laid loosely across the first abutment and the second abutment, and in the placement process, multiple bridge blocks in which the distance from the mounting surface to the floor surface increases as you move from the end side of the bridge towards the center side may be placed on the multiple temporary materials. In this bridge construction method, multiple temporary materials are laid loosely across the first abutment and the second abutment, and multiple bridge blocks in which the distance from the mounting surface to the floor surface increases as you move from the end side of the bridge towards the center side are placed on the multiple temporary materials, so that a bridge that becomes thicker as you move from the end side to the center side can be constructed. Furthermore, by using tensioning members as individual temporary structural members to tension multiple bridge blocks and integrate them into a single structure, prestress can be introduced to the bottom of the central part of the bridge, where tensile stress tends to be high. This increases the rigidity of the bridge.

[0011] [5] In the bridge construction method described in [1] above, in the temporary material installation process, a linearly extending H-shaped temporary structure may be placed between the first and second abutments as each of the multiple temporary materials, and in the integration process, the multiple bridge blocks may be integrated by tensioning the multiple bridge blocks using tensioning members. In this bridge construction method, by installing an H-shaped temporary structure as each of the multiple temporary materials, high rigidity can be given to the multiple temporary materials, and the multiple temporary materials can be installed easily and in a short period of time.

[0012] [6] In the bridge construction method described in any one of [1] to [5] above, a temporary material removal step may be further provided after the integration step, in which multiple temporary materials are removed. In this bridge construction method, since multiple temporary materials are removed after the integration step, it becomes possible to use temporary structures that cannot maintain their load-bearing capacity over a long period of time as multiple temporary materials. In addition, it is possible to prevent the aesthetic appearance of the bridge from being reduced by the use of multiple temporary materials. [Effects of the Invention]

[0013] According to the present invention, construction can be completed in a short period of time. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram illustrating the temporary material installation process of the bridge construction method according to the first embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the Ic-Ic line shown in Figure 1(a). [Figure 2] This is a schematic diagram illustrating the installation process of the bridge construction method according to the first embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the line IIc-IIc shown in Figure 2(a). [Figure 3] This is a schematic diagram illustrating the placement process and integration process of the bridge construction method according to the first embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the line IIIc-IIIc shown in Figure 3(a). [Figure 4] This is a schematic diagram illustrating the temporary material installation process of the bridge construction method according to the second embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the line IVc-IVc shown in Figure 4(a). [Figure 5] This is a schematic diagram illustrating the installation process of the bridge construction method according to the second embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the Vc-Vc line shown in Figure 5(a). [Figure 6] This is a schematic diagram illustrating the placement process and integration process of the bridge construction method according to the second embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the VIc-VIc line shown in Figure 6(a). [Figure 7] This is a schematic diagram illustrating the construction method of a bridge according to the third embodiment, where (a) is a side view showing the temporary material installation process, (b) is a side view showing the placement process, and (c) is a side view showing the placement process and the integration process. [Figure 8]It is a schematic diagram for explaining a method of constructing a bridge according to the fourth embodiment. (a) is a side view showing the temporary material installation process, (b) is a side view showing the placement process, (c) is a side view showing the placement process, (d) is a side view showing the placement process and the integration process, and (e) is a side view showing the integration process. [Figure 9] It is a schematic diagram for explaining a method of constructing a bridge according to the fifth embodiment. (a) is a plan view, and (b) is a cross-sectional view taken along line IXb-IXb shown in FIG. 10(a). [Figure 10] (a), (b), (c), and (d) are schematic front views showing other examples of bridge blocks. [Embodiments for Carrying Out the Invention]

[0015] [[ID=…]]Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0016] [[ID=1[First Embodiment] The method of constructing a bridge according to this embodiment is a method of constructing a bridge erected between a first abutment and a second abutment in a river, a harbor, or the like. The first abutment is an abutment where one end of the bridge is constructed, and the second abutment is an abutment where the other end of the bridge is constructed. This bridge is the superstructure (upper structure) of the bridge erected on the first abutment and the second abutment. The method of constructing a bridge according to the first embodiment includes a temporary material installation process, a placement process, and an integration process. <[ …

[0017] (Temporary Material Installation Process) FIG. 1 is a schematic diagram for explaining the temporary material installation process of the method of constructing a bridge according to the first embodiment. (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view taken along line Ic-Ic shown in FIG. 1(a). As shown in FIG. 1, in the temporary material installation process, a plurality of temporary materials 1 are spanned between the first abutment 2 and the second abutment 3. <((

[0018] In the temporary construction phase, the first base 4 is installed on the first abutment 2, and the second base 5 is installed on the second abutment 3. The first base 4 is a structure that forms one end of the bridge 10 (see Figure 3), and the second base 5 is a structure that forms the other end of the bridge 10. Therefore, the area from the first base 4 to the second base 5 becomes the construction site 11 of the bridge 10. The construction site 11 of the bridge 10 is the location where the bridge 10 is planned to be constructed, and the bridge 10 will be constructed at the construction site 11. The first base 4 and the second base 5 are constructed, for example, from precast blocks.

[0019] The first base 4 and the second base 5 do not necessarily have to be fixed to the first abutment 2 and the second abutment 3, but it is preferable to fix them to the first abutment 2 and the second abutment 3 in order to prevent the first base 4 and the second base 5 from moving during the subsequent mounting process. When the first base 4 and the second base 5 are fixed to the first abutment 2 and the second abutment 3, they may be fixed so as not to move relative to the first abutment 2 and the second abutment 3, but in order to introduce prestress to the bridge 10, at least one of the first base 4 and the second base 5 may be fixed so as to move relative to the first abutment 2 and the second abutment 3. Fixing them so as to move means that it is possible to switch between an immovable state and a movable state by a locking mechanism or the like. For example, a locking mechanism may be used to fix at least one of the first base 4 and the second base 5 so that it cannot be moved relative to the first abutment 2 and the second abutment 3, and by releasing the locking mechanism, at least one of the first base 4 and the second base 5 may be made movable relative to the first abutment 2 and the second abutment 3.

[0020] In the temporary material installation process, multiple temporary materials 1 are prepared. In this embodiment, two temporary materials 1 are prepared as multiple temporary materials 1. As temporary materials 1, tensioning materials such as PC steel bars and PC steel wires are used. It is preferable that the temporary materials 1 have sufficient rigidity so that they do not deflect significantly even when bridge blocks are placed on them in the subsequent placement process. Furthermore, as temporary materials 1, it is preferable to use PC steel bars with threaded grooves formed on their circumferential surface, such as Gebinde (fully threaded PC steel bars), from the viewpoint of easily introducing prestress into the bridge 10.

[0021] In the temporary material installation process, the two prepared temporary materials 1 are then attached to the first base 4 and the second base 5, thereby spanning the two temporary materials 1 between the first abutment 2 and the second abutment 3. "Spanning two (or more) temporary materials 1 between the first abutment 2 and the second abutment 3" means installing the two (or more) temporary materials 1 so that they extend from the first abutment 2 to the second abutment 3. The attachment of each of the two temporary materials 1 to the first base 4 and the second base 5 is performed, for example, by passing the two temporary materials 1 through holes formed in the first base 4 and the second base 5, attaching fastening members 6 and 7 such as nuts to both ends of each of the two temporary materials 1, and tightening the fastening members 6 and 7 to position the two temporary materials 1 relative to the first base 4 and the second base 5. As a result, the two temporary materials 1 are spanned between the first abutment 2 and the second abutment 3 at the construction site 11 of the bridge 10. The bridge axis direction D1 of the bridge 10 is, for example, the direction in which the first abutment 2 and the second abutment 3 face each other. Also, the bridge axis direction D1 of the bridge 10 is, for example, the direction in which the bridge 10 extends. If the first base 4 and the second base 5 are fixed to the first abutment 2 and the second abutment 3, the temporary member 1 may be tensioned by tightening the fastening members 6 and 7 to the first base 4 and the second base 5. Other methods may be used to tension the temporary member 1.

[0022] (Placement process) Figure 2 is a schematic diagram illustrating the placement process of the bridge construction method according to the first embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the line IIc-IIc shown in Figure 2(a). Figure 3 is a schematic diagram illustrating the placement process and integration process of the bridge construction method according to the first embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the line IIIc-IIIc shown in Figure 3(a). As shown in Figures 2 and 3, in the placement process, multiple bridge blocks 8 constituting the bridge 10 are placed on two temporary members 1.

[0023] In the installation process, first, multiple bridge blocks 8 are prepared. Each of the multiple bridge blocks 8 is a precast block that forms the individual shape of a bridge 10 divided into multiple sections along the bridge axis direction D1 of the bridge 10. Therefore, each of the multiple bridge blocks 8 forms a cross-section of the bridge 10 in a direction perpendicular to the bridge axis direction D1 of the bridge 10. In other words, each of the multiple bridge blocks 8 forms not only a part of the cross-section of the bridge 10 in a direction perpendicular to the bridge axis direction D1 of the bridge 10, but also the entire cross-section of the bridge 10 in a direction perpendicular to the bridge axis direction D1 of the bridge 10. The number of bridge blocks 8, that is, the number of divisions of the bridge 10 along the bridge axis direction D1, is not particularly limited and can be, for example, a number that makes it easy to transport the bridge blocks 8. Also, each of the multiple bridge blocks 8 may have a constant cross-sectional shape along the bridge axis direction D1 of the bridge 10, or it may have a cross-sectional shape that changes along the bridge axis direction D1 of the bridge 10. For example, each of the multiple bridge blocks 8 may be formed such that, like an arch bridge, its thickness decreases towards the center of the bridge 10 in the bridge axis direction D1, based on stress calculations.

[0024] Precast blocks may be formed, for example, by pouring cement-based materials such as concrete or mortar (hereinafter simply referred to as "concrete, etc.") into a formwork, or by 3D printing of concrete, etc. For 3D printing of concrete, etc., gantry-type 3D printers, robotic arm-type 3D printers, etc., are used. In recent years, the rapid development of 3D printing technology for concrete, etc. has made it possible to optimize the topology of concrete, etc. Therefore, by forming precast blocks with optimized topology using 3D printing of concrete, etc., a significant reduction in the weight of the precast blocks can be achieved.

[0025] Furthermore, each of the multiple bridge blocks 8 has a floor surface 8a that serves as the traffic surface of the bridge 10, a mounting surface 8b that rests on each of the two temporary members 1, and a hollow section 8c. The floor surface 8a is formed by the upper surface of the bridge block 8. The mounting surface 8b is formed by the downward-facing surface of the bridge block 8 so that it can be placed on each of the temporary members 1 from above. In addition, each of the multiple bridge blocks 8 is formed in a T-shape by a horizontally extending floor plate section 8d and a vertical rib section 8e that extends downward from the center of the floor plate section 8d. The upper surface of the floor plate section 8d is the floor surface 8a, and the lower surfaces of the floor plate section 8d located on both sides of the vertical rib section 8e are the mounting surfaces 8b.

[0026] The hollow section 8c penetrates each of the multiple bridge blocks 8 in the bridge axis direction D1 of the bridge 10 (the direction of adjacency between adjacent bridge blocks 8). When the precast blocks that make up the bridge blocks 8 are formed by pouring concrete or the like into a formwork, the hollow section 8c can be formed by placing a hollow pipe inside the formwork and pouring concrete or the like, or by drilling a hollow section 8c into the poured precast block. When the precast blocks that make up the bridge blocks 8 are formed by 3D printing of concrete or the like, the hollow section 8c can be formed by 3D printing the precast block so that it has a hollow section 8c. All of the bridge blocks 8 that make up the bridge 10 may have a hollow section 8c, or only some of the bridge blocks 8 that make up the bridge 10 may have a hollow section 8c. For example, bridge blocks 8 located at both ends in the bridge axis direction D1 of the bridge 10 may not have hollow sections 8c, while other bridge blocks 8 may have hollow sections 8c.

[0027] In the placement process, the prepared bridge blocks 8 are then placed on the two temporary members 1. That is, the bridge blocks 8 are lowered from above the two temporary members 1, the vertical rib section 8e is placed between the two temporary members 1, and the placement surface 8b of the floor plate section 8d is placed on the two temporary members 1, thereby placing the multiple bridge blocks 8 on the two temporary members 1. The order in which the multiple bridge blocks 8 are placed on the two temporary members 1 is not particularly limited, but it is preferable, for example, to place the bridge blocks 8 sequentially on the two temporary members 1 from the first base 4 toward the second base 5, and also to place the bridge blocks 8 sequentially on the two temporary members 1 from the second base 5 toward the first base 4. At this time, the bridge blocks 8 may be placed on the two temporary members 1 using machinery such as a crane, but if the bridge blocks 8 are formed by 3D printing, the bridge blocks 8 can be made lighter by optimizing the topology, so the bridge blocks 8 may be placed on the two temporary members 1 by hand. Then, by placing all the bridge blocks 8 on the two temporary members 1, multiple bridge blocks 8 are laid between the first base 4 and the second base 5.

[0028] (integration process) As shown in Figure 3, the integration process involves integrating multiple bridge blocks 8, which are placed on two temporary members 1.

[0029] In the integration process, multiple bridge blocks 8 are integrated by tensioning them with two temporary members 1. Alternatively, the integration of multiple bridge blocks 8 may be performed by inserting another tensioning member (not shown) into the hollow portion 8c of the multiple bridge blocks 8 and tensioning them with this other tensioning member, in addition to the tensioning with the two temporary members 1 described above. Furthermore, the integration of multiple bridge blocks 8 may also be performed by bonding adjacent bridge blocks 8 together with adhesive, in addition to the tensioning with the two temporary members 1 described above, or by bonding adjacent bridge blocks 8 together with adhesive, etc. By integrating the multiple bridge blocks 8 in this way, the bridge 10 is constructed and erected on the first abutment 2 and the second abutment 3.

[0030] Thus, in the bridge construction method according to this embodiment, two temporary members 1 are placed between the first abutment 2 and the second abutment 3, and multiple bridge blocks 8 are placed on the two temporary members 1 and the multiple bridge blocks 8 are integrated. Therefore, the placement and integration of the multiple bridge blocks 8 can be performed at the construction site 11 of the bridge 10. In other words, there is no need to move the integrated bridge blocks 8 to the construction site 11 of the bridge 10. For this reason, construction can be completed in a short period of time.

[0031] Furthermore, when forming bridge blocks 8 using 3D printing, the weight of the bridge blocks can be reduced by optimizing the topology. By using these lighter bridge blocks 8, it becomes possible to manually place multiple bridge blocks 8 onto two temporary support members 1, eliminating the need to set up and remove cranes during the placement process, thus further shortening the construction period.

[0032] Furthermore, since multiple bridge blocks 8 are tensioned by the tensioning members used as each of the two temporary members 1, and the multiple bridge blocks 8 are integrated, the integration process period can be further shortened. In addition, the two temporary members 1 can be used as permanent members, and prestress can be introduced into the bridge 10 by the two temporary members 1, so the construction period can be further shortened. Moreover, since the tensioning members used as each of the two temporary members 1 are placed on the outside of the bridge 10, the tensioning members can be visually inspected from the outside. For this reason, maintenance of the tensioning members can be easily performed even after the construction of the bridge 10. However, from the viewpoint of protecting the tensioning members, they may be covered with covers or the like. When replacing the tensioning members, for example, the bridge 10 may be tensioned by passing new tensioning members through the inside of the bridge 10, removing the tensioning members used as temporary members 1, and if necessary, placing new tensioning members in the positions of the removed tensioning members, and then tensioning the bridge 10.

[0033] [Second Embodiment] Next, a second embodiment will be described. The second embodiment is basically the same as the first embodiment, except that the temporary materials differ from those of the first embodiment. For this reason, only the differences from the first embodiment will be described below, and the descriptions of matters that are the same as those of the first embodiment will be omitted. The bridge construction method according to the second embodiment comprises a temporary material installation step, a placement step, an integration step, and a temporary material removal step.

[0034] (Temporary material installation process) Figure 4 is a schematic diagram illustrating the temporary material installation process of the bridge construction method according to the second embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the line IVc-IVc shown in Figure 4(a). As shown in Figure 4, in the temporary material installation process, multiple temporary materials 1A are spanned between the first abutment 2 and the second abutment 3.

[0035] In the temporary material installation process, first, multiple temporary materials 1A are prepared. In this embodiment, two temporary materials 1A are prepared as multiple temporary materials 1A. As temporary materials 1A, a temporary structure with an H-shaped cross-section extending in a straight line is used. It is preferable that the temporary materials 1A have sufficient rigidity to prevent significant deflection when bridge blocks are placed on them in the subsequent placement process. For this reason, it is preferable to use a highly rigid temporary structure such as an H-beam or an H-shaped fiber-reinforced plastic (FRP) molded product as the temporary material 1A.

[0036] In the temporary material installation process, the two prepared temporary materials 1A are then placed on the first abutment 2 and the second abutment 3, thereby spanning the two temporary materials 1A between the first abutment 2 and the second abutment 3. As a result, the two temporary materials 1A are spanned between the first abutment 2 and the second abutment 3 at the construction position 11A of the bridge 10A.

[0037] (Placement process) Figure 5 is a schematic diagram illustrating the placement process of the bridge construction method according to the second embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the Vc-Vc line shown in Figure 5(a). Figure 6 is a schematic diagram illustrating the placement process and integration process of the bridge construction method according to the second embodiment, where (a) is a side view, (b) is a plan view, and (c) is a cross-sectional view along the VIc-VIc line shown in Figure 6(a). As shown in Figures 5 and 6, in the placement process, multiple bridge blocks 8A constituting the bridge 10A are placed on two temporary members 1A.

[0038] In the installation process, first, multiple bridge blocks 8A are prepared. Each of the multiple bridge blocks 8A is a precast block that forms an individual shape obtained by dividing the bridge 10A into multiple sections along the bridge axis direction D1 of the bridge 10A, similar to the bridge block 8 of the first embodiment. Therefore, each of the multiple bridge blocks 8A forms a cross-section of the bridge 10A in a direction perpendicular to the bridge axis direction D1 of the bridge 10A.

[0039] Furthermore, each of the multiple bridge blocks 8A, similar to the bridge block 8 of the first embodiment, has a floor surface 8Aa that serves as the traffic surface of the bridge 10A, a mounting surface 8Ab that rests on each of the two temporary members 1A, and a hollow section 8Ac. Also, each of the multiple bridge blocks 8A, similar to the bridge block 8 of the first embodiment, is formed in a T-shape by a horizontally extending floor plate section 8Ad and a vertical rib section 8Ae that extends downward from the center of the floor plate section 8Ad, with the hollow section 8Ac penetrating in the bridge axis direction D1 of the bridge 10A.

[0040] In the placement process, the next step is to place the prepared bridge blocks 8A onto the two temporary members 1A. That is, the bridge blocks 8A are lowered from above the two temporary members 1A, the vertical rib sections 8Ae are placed between the two temporary members 1A, and the placement surface 8Ab of the floor plate section 8Ad is placed on the two temporary members 1A, thereby placing the multiple bridge blocks 8A onto the two temporary members 1A. The order in which the multiple bridge blocks 8A are placed onto the two temporary members 1A is not particularly limited, but for example, it is preferable to place the bridge blocks 8A sequentially from the first abutment 2 toward the second abutment 3, and also sequentially from the second abutment 3 toward the first abutment 2. By placing all the bridge blocks 8A onto the two temporary members 1A, the multiple bridge blocks 8A are laid out between the first abutment 2 and the second abutment 3.

[0041] (integration process) As shown in Figure 6, in the integration process, multiple bridge blocks 8A, which are placed on two temporary members 1A, are integrated into one.

[0042] In the integration process, multiple bridge blocks 8A are integrated by tensioning them with tensioning members 9A such as PC steel bars or PC steel wires. As the tensioning members 9A, it is preferable to use PC steel bars with screw grooves formed on their circumferential surface, such as Gebinde, from the viewpoint of easily introducing prestress to multiple bridge blocks 8A. The integration of multiple bridge blocks 8A using tensioning members 9A may be carried out, for example, by inserting the tensioning members 9A into the hollow portion 8Ac of the bridge block 8 and tensioning the multiple bridge blocks 8 with these tensioning members 9A. Alternatively, the integration of multiple bridge blocks 8A may be carried out by bonding adjacent bridge blocks 8A with adhesive in addition to tensioning with tensioning members 9A. By integrating the multiple bridge blocks 8A in this way, the bridge 10A is constructed and the bridge 10A is erected on the first abutment 2 and the second abutment 3.

[0043] (Temporary material removal process) In the temporary material removal process, two temporary material 1A will be removed. However, the two temporary material 1A may be left in place as permanent materials without performing the temporary material removal process.

[0044] Thus, in the bridge construction method according to this embodiment, two temporary members 1A are placed between the first abutment 2 and the second abutment 3, and multiple bridge blocks 8A are placed on the two temporary members 1A and the multiple bridge blocks 8A are integrated. Therefore, the placement and integration of the multiple bridge blocks 8A can be performed at the construction position 11A of the bridge 10A. In other words, there is no need to move the integrated bridge blocks 8A to the construction position 11A of the bridge 10A. For this reason, construction can be completed in a short period of time.

[0045] Furthermore, by installing an H-shaped cross-section temporary structure as each of the two temporary members 1A, high rigidity can be provided to the two temporary members 1A, and the two temporary members 1A can be installed easily and in a short period of time.

[0046] Furthermore, since the two temporary members 1A are removed after the integration process, it becomes possible to use temporary structures that cannot maintain their load-bearing capacity over a long period of time as temporary members 1A. In addition, it is possible to prevent the aesthetic appearance of the bridge 10A from being diminished by the two temporary members 1A.

[0047] [Third Embodiment] Next, a third embodiment will be described. The third embodiment is basically the same as the first embodiment, except for the method of installing the temporary materials and the shape of the bridge blocks. For this reason, only the differences from the first embodiment will be described below, and the explanation of the same matters as the first embodiment will be omitted. The bridge construction method according to the third embodiment comprises a temporary material installation step, a placement step, and an integration step.

[0048] (Temporary material installation process) Figure 7 is a schematic diagram illustrating the construction method of a bridge according to the third embodiment, where (a) is a side view showing the temporary material installation process, (b) is a side view showing the placement process, and (c) is a side view showing the placement process and the integration process. As shown in Figure 7(a), in the temporary material installation process, multiple temporary materials 1 are spanned between the first abutment 2 and the second abutment 3.

[0049] In the temporary material installation process, first, as in the first embodiment, the first base 4 is installed on the first abutment 2 and the second base 5 is installed on the second abutment 3. Next, in the temporary material installation process, as in the first embodiment, two temporary materials 1 are prepared as multiple temporary materials 1.

[0050] In the temporary material installation process, the two prepared temporary materials 1 are then attached to the first base 4 and the second base 5, thereby bridging the two temporary materials 1 between the first abutment 2 and the second abutment 3 in a slack state. The attachment of the two temporary materials 1 to the first base 4 and the second base 5 is performed, for example, by passing the two temporary materials 1 through holes formed in the first base 4 and the second base 5, attaching fastening members 6 and 7 such as nuts to both ends of the two temporary materials 1, and tightening the fastening members 6 and 7 so that the two temporary materials 1 are in a slack state, thereby positioning the two temporary materials 1 relative to the first base 4 and the second base 5. As a result, the two temporary materials 1 are bridging the first abutment 2 and the second abutment 3 in a slack state at the construction position 11B of the bridge 10B. Furthermore, the statement that the two temporary members 1 are stretched across the first abutment 2 and the second abutment 3 in a slack state means that the central part of each of the two temporary members 1 hangs down lower than the ends of each of the two temporary members 1, and that they are stretched across the first abutment 2 and the second abutment 3 in this state.

[0051] (Placement process) As shown in Figures 7(b) and 7(c), in the installation process, multiple bridge blocks 8B that make up the bridge 10B are placed on two temporary members 1.

[0052] In the installation process, first, multiple bridge blocks 8B with different shapes are prepared according to their position in the bridge axis direction D1 of the bridge 10B. Each of the multiple bridge blocks 8B is a precast block that forms an individual shape obtained by dividing the bridge 10B into multiple parts along the bridge axis direction D1 of the bridge 10B.

[0053] Each of the multiple bridge blocks 8B has a floor surface 8Ba which serves as the traffic surface of the bridge 10B, a mounting surface 8Bb which rests on each of the two temporary members 1, and a hollow section (not shown). The floor surface 8Ba is formed by the upper surface of the bridge block 8B. The mounting surface 8Bb is formed by the downward-facing surface of the bridge block 8B so that it can be placed on each of the temporary members 1 from above.

[0054] Furthermore, in this embodiment, the multiple bridge blocks 8B are configured such that the distance (thickness) from the mounting surface 8Bb to the floor surface 8Ba increases as you move from the end side to the central side in the bridge axis direction D1 of the bridge 10B. For this reason, the distance from the mounting surface 8Bb to the floor surface 8Ba of a bridge block 8B located in the central part in the bridge axis direction D1 of the bridge 10B is longer than the distance from the mounting surface 8Bb to the floor surface 8Ba of a bridge block 8B located at the end side in the bridge axis direction D1 of the bridge 10B. It is sufficient that the multiple bridge blocks 8B as a whole are formed such that the distance from the mounting surface 8Bb to the floor surface 8Ba increases as you move from the end side to the central side in the bridge axis direction D1 of the bridge 10B; the distance from the mounting surface 8Bb to the floor surface 8Ba may be the same for some adjacent bridge blocks 8B.

[0055] In the placement process, the prepared bridge blocks 8B are then placed on two temporary members 1. That is, the bridge blocks 8B are placed on the two temporary members 1 such that the distance from the placement surface 8Bb to the floor surface 8Ba increases as you move from the end side to the center side in the bridge axis direction D1 of the bridge 10B. The order in which the bridge blocks 8B are placed on the two temporary members 1 is not particularly limited, but it is preferable, for example, to place the bridge blocks 8B sequentially from the first base 4 toward the second base 5 side, and then to place the bridge blocks 8B sequentially from the second base 5 toward the first base 4 side. By placing all the bridge blocks 8B on the two temporary members 1, the bridge blocks 8B are laid out between the first base 4 and the second base 5.

[0056] At this time, all bridge blocks 8B are placed on two temporary members 1 such that the floor surfaces 8Ba of the multiple bridge blocks 8B are continuous and flat, and the mounting surfaces 8Bb of the multiple bridge blocks 8B become lower as they move from the end side to the center side in the bridge axis direction D1 of the bridge 10B. In order to ensure that all bridge blocks 8B placed on the two temporary members 1 are in this state, it is preferable to calculate in advance the degree to which the two temporary members 1 are slackened when they are spanned between the first abutment 2 and the second abutment 3, and the distance from the mounting surface 8Bb of each bridge block 8B to the floor surface 8Ba, and to perform the temporary member installation process and the mounting process based on these calculations.

[0057] (integration process) As shown in Figure 7(c), in the integration process, multiple bridge blocks 8B placed on two temporary members 1 are integrated into one.

[0058] In the integration process, multiple bridge blocks 8B are integrated by tensioning them with two temporary members 1. At this time, the multiple bridge blocks 8B are configured such that the distance from the mounting surface 8Bb to the floor surface 8Ba increases from the end side to the center side in the bridge axis direction D1 of the bridge 10B. Therefore, by tensioning the multiple bridge blocks 8B with two temporary members 1 that are stretched between the first abutment 2 and the second abutment 3 in a slack state, the multiple bridge blocks 8B become tensioned by the two temporary members 1 near their bottoms. By integrating the multiple bridge blocks 8B in this way, the bridge 10B is constructed and erected on the first abutment 2 and the second abutment 3.

[0059] Furthermore, the integration of multiple bridge blocks 8B may be performed not only by tensioning with the two temporary members 1 described above, or as an alternative to tensioning with the two temporary members 1 described above, by inserting another tensioning member (not shown) into the hollow portion of the multiple bridge blocks 8B and tensioning the multiple bridge blocks 8B with this other tensioning member. Alternatively, the integration of multiple bridge blocks 8B may be performed not only by tensioning with the two temporary members 1 described above, or as an alternative to tensioning with the two temporary members 1 described above, by bonding adjacent bridge blocks 8B together with adhesive or the like.

[0060] Thus, in the bridge construction method according to this embodiment, two temporary members 1 are laid loosely across the first abutment 2 and the second abutment 3, and multiple bridge blocks 8, whose distance from the mounting surface 8Bb to the floor surface 8Ba increases as they move from the end side to the center side of the bridge 10B, are placed on the two temporary members 1. This makes it possible to construct a bridge 10B that becomes thicker as it moves from the end side to the center side. Moreover, since the multiple bridge blocks 8B are tensioned by the tensioning members used as each of the two temporary members 1 and integrated together, prestress can be introduced to the bottom of the central part of the bridge 10B, where tensile stress tends to be high. This makes it possible to increase the rigidity of the bridge 10.

[0061] [Fourth Embodiment] Next, the fourth embodiment will be described. The fourth embodiment is basically the same as the first embodiment, except that some bridge blocks are integrated during the installation process. For this reason, only the differences from the first embodiment will be described below, and the same aspects as the first embodiment will be omitted. The bridge construction method according to the fourth embodiment comprises a temporary material installation process, an installation process, and an integration process.

[0062] (Temporary material installation process) Figure 8 is a schematic diagram illustrating the construction method of a bridge according to the fourth embodiment, where (a) is a side view showing the temporary material installation process, (b) is a side view showing the placement process, (c) is a side view showing the placement process, (d) is a side view showing the placement and integration processes, and (e) is a side view showing the integration process. As shown in Figure 8(a), in the temporary material installation process, multiple temporary materials 1 are spanned between the first abutment 2 and the second abutment 3.

[0063] In the temporary material installation process, first, as in the first embodiment, the first base 4 is installed on the first abutment 2 and the second base 5 is installed on the second abutment 3. Next, in the temporary material installation process, as in the first embodiment, two temporary materials 1 are prepared as multiple temporary materials 1. As temporary materials 1, PC steel bars with screw grooves formed on their circumferential surface, such as Gebinde, are used. Next, in the temporary material installation process, the two prepared temporary materials 1 are attached to the first base 4 and the second base 5, thereby spanning the two temporary materials 1 between the first abutment 2 and the second abutment 3. As a result, the two temporary materials 1 are spanned between the first abutment 2 and the second abutment 3 at the construction position 11C of the bridge 10C (see Figures 8(d) and 8(e)). At this time, multiple nuts 12C (see Figure 8(c)) are screwed onto each of the two temporary materials 1.

[0064] (Placement process) As shown in Figures 8(b), 8(c), and 8(d), in the installation process, multiple bridge blocks 8C that make up the bridge 10C are placed on two temporary members 1.

[0065] In the installation process, first, multiple bridge blocks 8C are prepared. Each of the multiple bridge blocks 8C is a precast block that forms an individual shape obtained by dividing the bridge 10C into multiple sections along the bridge axis direction D1 of the bridge 10C. Next, in the installation process, the prepared multiple bridge blocks 8C are placed on two temporary members 1. At this time, the bridge blocks 8C are placed sequentially on the two temporary members 1 from the first base 4 toward the second base 5, and these bridge blocks 8C are tightened toward the first base 4 with nuts 12C. As a result, one or more bridge blocks 8C continuous from the first base 4 are tensioned and integrated by the temporary members 1. Also, the bridge blocks 8C are placed sequentially on the two temporary members 1 from the second base 5 toward the first base 4, and these bridge blocks 8C are tightened toward the second base 5 with nuts 12C. As a result, one or more bridge blocks 8C that are continuous with the second base 5 are tensioned and integrated by the temporary material 1. Note that tensioning with nuts 12C may be performed for each bridge block 8C or for multiple bridge blocks 8C. Then, by placing all the bridge blocks 8C on the two temporary material 1, multiple bridge blocks 8C are laid between the first base 4 and the second base 5.

[0066] (integration process) As shown in Figures 8(d) and 8(e), the integration process integrates multiple bridge blocks 8C that are placed on two temporary members 1.

[0067] In the integration process, multiple bridge blocks 8C are integrated by tensioning them with two temporary members 1. Furthermore, to further strengthen the integration of the multiple bridge blocks 8C, another tensioning member 13C is inserted into the hollow portion of the multiple bridge blocks 8C, and the multiple bridge blocks 8C are further tensioned and integrated by this additional tensioning member 13C. By integrating the multiple bridge blocks 8C in this way, the bridge 10C is constructed and erected on the first abutment 2 and the second abutment 3.

[0068] Thus, in the bridge construction method according to this embodiment, since multiple bridge blocks 8C are placed on two temporary members 1 while some of the bridge blocks 8C are tensioned and integrated, it is possible to suppress the movement of each bridge block 8C on the two temporary members 1 and to integrate the multiple bridge blocks 8C more firmly.

[0069] [Fifth Embodiment] Next, the fifth embodiment will be described. The fifth embodiment is basically the same as the first embodiment, differing from the first embodiment in that the bridge is divided into multiple lanes in the width direction of the bridge. For this reason, only the differences from the first embodiment will be described below, and the explanation of matters that are the same as the first embodiment will be omitted. Figure 9 is a schematic diagram for explaining the construction method of the bridge according to the fifth embodiment, where (a) is a plan view and (b) is a cross-sectional view along the line IXb-IXb shown in Figure 9(a). As shown in Figures 9(a) and 9(b), the construction method of the bridge according to this embodiment includes a temporary material installation step, a placement step, and an integration step.

[0070] (Temporary material installation process) In the temporary material installation process, the construction position 11D of the bridge 10D is divided into multiple lanes in the width direction D2 (horizontal direction) perpendicular to the bridge axis direction D1 of the bridge 10D, and multiple temporary materials 1 are placed between the first abutment 2 and the second abutment 3 in each lane. Figure 9 shows the case where the construction position 11D of the bridge 10D is divided into three lanes in the width direction D2.

[0071] In the temporary material installation process, first, the first base 4D is installed on the first abutment 2, and the second base 5D is installed on the second abutment 3. The first base 4D is a structure that constitutes one end of the bridge 10D, that is, one end of all the lanes of the bridge 10D. The second base 5D is a structure that constitutes the other end of the bridge 10D, that is, the other end of all the lanes of the bridge 10D. Therefore, the area from the first base 4D to the second base 5D becomes the construction position 11D of the bridge 10D. Next, in the temporary material installation process, two temporary materials 1 are prepared for each lane. That is, two temporary materials 1a corresponding to the first lane, two temporary materials 1b corresponding to the second lane, and two temporary materials 1c corresponding to the third lane are prepared. In the temporary material installation process, two temporary materials 1 are then attached to the first base 4 and the second base 5 for each lane, thereby spanning two temporary materials 1 across the first abutment 2 and the second abutment 3 in each lane. Specifically, two temporary materials 1a are attached to the first base 4 and the second base 5 in the first lane, thereby spanning two temporary materials 1a across the first abutment 2 and the second abutment 3 in the first lane. Similarly, two temporary materials 1b are attached to the first base 4 and the second base 5 in the second lane, thereby spanning two temporary materials 1b across the first abutment 2 and the second abutment 3 in the second lane. Finally, two temporary materials 1c are attached to the first base 4 and the second base 5 in the third lane, thereby spanning two temporary materials 1c across the first abutment 2 and the second abutment 3 in the third lane. As a result, in each lane, two temporary members 1 are stretched across the first abutment 2 and the second abutment 3 at the construction site 11D of the bridge 10D.

[0072] (Placement process) In the placement process, multiple bridge blocks 8D that make up the bridge 10D are placed on two temporary materials 1 for each lane.

[0073] In the installation process, first, multiple bridge blocks 8D are prepared for each lane. That is, multiple bridge blocks 8D corresponding to the first lane, multiple bridge blocks 8D corresponding to the second lane, and multiple bridge blocks 8D corresponding to the third lane are prepared. Multiple bridge blocks 8D are precast blocks that form individual shapes obtained by dividing the bridge 10D into multiple sections along the bridge axis direction D1 and the width direction D2 of the bridge 10D. That is, multiple bridge blocks 8D are precast blocks that form individual shapes obtained by dividing each lane of the bridge 10D into multiple sections along the bridge axis direction D1 of the bridge 10D. In the installation process, next, for each lane, the prepared multiple bridge blocks 3d are placed on two temporary members 1. That is, in the first lane, the prepared multiple bridge blocks 3d are placed on two temporary members 1a. Also, in the second lane, the prepared multiple bridge blocks 3d are placed on two temporary members 1b. Furthermore, in the third lane, the prepared bridge blocks 3d are placed on two temporary materials 1c. At this time, the bridge blocks 8D may be placed sequentially on the two temporary materials 1 in each lane, or multiple lanes may be placed on the two temporary materials 1 simultaneously. Then, in all lanes, all the bridge blocks 8D are placed on the two temporary materials 1, thereby filling the space between the first base 4D and the second base 5D with multiple bridge blocks 8D.

[0074] (integration process) In the integration process, multiple bridge blocks 8D, which are placed on multiple temporary materials 1, are integrated into one unit.

[0075] In the integration process, first, multiple bridge blocks 8D are integrated in each lane by tensioning them with two temporary members 1. Specifically, in the first lane, multiple bridge blocks 8D in the first lane are integrated by tensioning them with two temporary members 1a. Similarly, in the second lane, multiple bridge blocks 8D in the second lane are integrated by tensioning them with two temporary members 1b. Furthermore, in the third lane, multiple bridge blocks 8D in the third lane are integrated by tensioning them with two temporary members 1c. In the integration process, the multiple bridge blocks 8D are then integrated between lanes. That is, the multiple bridge blocks 8D in the first lane, the multiple bridge blocks 8D in the second lane, and the multiple bridge blocks 8D in the third lane are integrated. The integration of the multiple bridge blocks 8D between lanes may be done, for example, by tensioning the multiple bridge blocks 8D between lanes with another tensioning member (not shown), or by bonding the multiple bridge blocks 8D between lanes with an adhesive or the like. By integrating the multiple bridge blocks 8D in this way, the bridge 10D is constructed and the bridge 10D is erected on the first abutment 2 and the second abutment 3.

[0076] Thus, in the bridge construction method according to this embodiment, the construction position 11D of the bridge 10D is divided into multiple lanes in the width direction D2, and two temporary members 1 are placed between the first abutment 2 and the second abutment 3 in each lane, and multiple bridge blocks 8D are placed on the two temporary members 1, thereby enabling the construction of a wide bridge 10D.

[0077] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and may be modified or applied to other things without changing the gist of each claim.

[0078] For example, in each of the embodiments described above, two temporary members were used to span the first and second abutments, and multiple bridge blocks were placed on these two temporary members. However, the number of temporary members spanned between the first and second abutments (the number of temporary members spanned, the number of temporary members on which each of the multiple bridge blocks is placed) can be any number of two or more. If only one temporary member is spanned between the first and second abutments, it is difficult to stably support multiple bridge blocks. However, if two or more temporary members are spanned between the first and second abutments, multiple bridge blocks can be stably supported regardless of the number of temporary members.

[0079] Furthermore, while the shapes of the bridge blocks were specifically shown in each of the embodiments described above, the shapes of the bridge blocks are not particularly limited.

[0080] For example, the number of mounting surfaces that can be placed on the temporary materials of a bridge block may be three or more. In this case, three temporary materials are spanned between the first and second abutments, corresponding to the mounting surfaces of the bridge block. Figures 10(a) and 10(b) are schematic side views showing other examples of bridge blocks. The bridge block 8E shown in Figure 10(a) has five mounting surfaces 8Eb that can be placed on the temporary materials. The bridge block 8F shown in Figure 10(b) has three mounting surfaces 8Fb that can be placed on the temporary materials.

[0081] Furthermore, for example, the mounting surface of the bridge block that rests on the temporary material does not have to be a surface parallel to the floor surface, and may be formed by recesses that catch on the temporary material. In the bridge block 8E shown in Figure 10(a), all five mounting surfaces 8Eb are formed in a concave curved shape by recesses that catch on the temporary material. In the bridge block 8F shown in Figure 10(b), all three mounting surfaces 8Fb are formed in a concave curved shape by recesses that catch on the temporary material. Figures 10(c) and 10(d) are schematic side views showing other examples of bridge blocks. In the bridge block 8G shown in Figure 10(c), all two mounting surfaces 8Gb are formed in a concave curved shape by recesses that catch on the temporary material. In the bridge block 8H shown in Figure 10(d), all two mounting surfaces 8Hb are formed in a concave curved shape by recesses that catch on the temporary material.

[0082] Furthermore, for example, if the mounting surface on which the temporary material is placed is not parallel to the floor surface, the distance from the mounting surface of the bridge block to the floor surface will be the shortest distance from the mounting surface to the floor surface. For example, in the bridge block 8G shown in Figure 10(c), the distance from the mounting surface 8Gb closest to the floor surface 8Ga to the floor surface 8Ga is the distance from the mounting surface to the floor surface. Similarly, in the bridge block 8H shown in Figure 10(d), the distance from the mounting surface 8Hb closest to the floor surface 8Ha to the floor surface 8Ha is the distance from the mounting surface to the floor surface. Note that the bridge block 8G shown in Figure 10(c) and the bridge block 8H shown in Figure 10(d) may also be used as multiple bridge blocks 8B in the third embodiment. In other words, in the third embodiment, the bridge block 8B located at the end of the bridge axis direction D1 of the bridge 10B may be the bridge block 8G shown in Figure 10(c), and the bridge block 8B located in the central part of the bridge axis direction D1 of the bridge 10B may be the bridge block 8H shown in Figure 10(d). In this case, the bridge block placed between bridge block 8G and bridge block 8H can be a bridge block whose shape gradually changes from bridge block 8G to bridge block 8H. [Explanation of Symbols]

[0083] 1,1A,1a,1b,1c...Temporary materials, 2...First abutment, 3...Second abutment, 4,4D...First base, 5,5D...Second base, 6...Fastening members, 7...Fastening members, 8,8A,8B,8C,8D,8E,8F,8G,8H...Bridge blocks, 8a,8Aa,8Ba,8Ha,8Ha...Floor surface, 8b,8Ab,8Bb,8Eb,8Fb,8Gb,8Hb...Placement surface, 8c,8Ac...Hollow section, 8d,8Ad...Floor plate section, 8e,8Ae...Longitudinal rib section, 9A...Tensioning members, 10,10A,10B,10C,10D...Bridge, 11,11A,11B,11C,11D...Construction location, 12C...Nut, 13C...Tensioning members, D1...Bridge axis direction, D2...Width direction.

Claims

1. A construction method for a bridge erected between the first and second abutments, A temporary material installation process involves bridging multiple temporary materials between the first abutment and the second abutment, The process involves placing multiple bridge blocks that constitute the bridge onto the aforementioned multiple temporary materials, The system includes an integration step of integrating the multiple bridge blocks that are placed on the multiple temporary materials, In the temporary material installation process, a temporary structure with a straight, H-shaped cross-section is placed between the first abutment and the second abutment, with each of the multiple temporary materials being a temporary structure extending in a straight line. In the integration process, the multiple bridge blocks are integrated by tensioning them using tensioning members. Bridge construction methods.

2. A method for constructing a bridge to be erected between a first abutment and a second abutment, A temporary material installation process involves bridging multiple temporary materials between the first abutment and the second abutment, The process involves placing multiple bridge blocks that constitute the bridge onto the aforementioned multiple temporary materials, The system includes an integration step of integrating the multiple bridge blocks that are placed on the multiple temporary materials, Each of the aforementioned bridge blocks has a horizontally extending deck plate portion and a vertical rib portion extending downward from the central part of the deck plate portion. In the aforementioned placement step, the vertical rib portion is placed between the two temporary members, and the lower surface of the floor plate portion is placed on the two temporary members. Bridge construction methods.

3. A method for constructing a bridge to be erected between a first abutment and a second abutment, A temporary material installation process involves bridging multiple temporary materials between the first abutment and the second abutment, The process involves placing multiple bridge blocks that constitute the bridge onto the aforementioned multiple temporary materials, The system includes an integration step of integrating the multiple bridge blocks that are placed on the multiple temporary materials, Each of the aforementioned bridge blocks is a precast block formed from a cement-based material. Each of the aforementioned plurality of bridge blocks has a mounting surface on which each of the aforementioned plurality of temporary materials rests, and a floor surface which becomes the traffic surface of the bridge. Bridge construction methods.

4. Each of the plurality of bridge blocks has a hollow portion, The method for constructing a bridge according to claim 3.

5. In the temporary material installation process, the first base is installed on the first abutment and the second base is installed on the second abutment. In the aforementioned placement process, the bridge blocks are sequentially placed on the two temporary members, starting from the first base and moving toward the second base, and the bridge blocks are tightened toward the first base with nuts. A method for constructing a bridge according to any one of claims 1 to 4.

6. In the temporary material installation step, the construction position of the bridge is divided into multiple lanes in the width direction perpendicular to the bridge axis direction of the bridge, and the multiple temporary materials are placed between the first abutment and the second abutment. In the aforementioned placement process, for each lane, the plurality of bridge blocks are placed on two of the temporary materials, In the integration process, the plurality of bridge blocks are integrated for each lane. A method for constructing a bridge according to any one of claims 1 to 4.

7. In the temporary material installation process, tension members are placed between the first abutment and the second abutment as each of the multiple temporary materials. In the integration process, the multiple bridge blocks are tensioned by the multiple temporary materials to integrate the multiple bridge blocks. A method for constructing a bridge according to any one of claims 1 to 4.

8. The bridge block has recesses that hook onto each of the plurality of temporary materials, The method for constructing a bridge according to claim 7.

9. Each of the aforementioned plurality of bridge blocks has a mounting surface on which each of the aforementioned plurality of temporary materials rests, and a floor surface which becomes the traffic surface of the bridge. In the temporary material installation process, the multiple temporary materials are laid loosely and then placed between the first abutment and the second abutment. In the aforementioned placement process, the plurality of bridge blocks, the distance from the aforementioned placement surface to the floor surface increasing as you move from the end side of the bridge towards the central part, are placed on the plurality of temporary materials. The method for constructing a bridge according to claim 7 or 8.

10. In the temporary material installation process, a temporary structure with a straight, H-shaped cross-section is placed between the first abutment and the second abutment, with each of the multiple temporary materials being a temporary structure extending in a straight line. In the integration process, the multiple bridge blocks are integrated by tensioning them using tensioning members. A method for constructing a bridge according to any one of claims 1 to 4.

11. The system further comprises a temporary material removal step, which involves removing the plurality of temporary materials after the integration step. The method for constructing a bridge according to claim 10.

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