Bridge construction methods

Abstract

To provide a bridge that can be efficiently constructed.SOLUTION: A bridge 1 has a ground cover block 20 that has a ground cover 22 that extends in the longitudinal direction and is integrally formed on one end of a precast concrete plate along the longitudinal direction, a slab block 30 that is arranged adjacently to the other end along the longitudinal direction of the ground cover block 20, and a bridge pier block 10 that supports both ends of the ground cover block 20 facing each other in the longitudinal direction, and both ends of the slab block 30 facing each other in the longitudinal direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for constructing a bridge and a block suitable therefor.

Background Art

[0002] In Patent Document 1, in order to easily and efficiently join precast concrete floor slabs and construct a bridge, it is described that a ground cover is integrally formed on both sides in the short side direction of a precast concrete slab in which the upper part of the truss bars protrudes from the concrete slab.

[0003] Patent Document 2 discloses a technique aimed at providing a guardrail support and a guardrail that can suppress the overhang of the guardrail support toward the sidewalk while securing the building limit, realize smooth passage on the sidewalk, and sufficiently ensure the impact absorption capacity. In this document, the guardrail support is mainly composed of a front flange, a rear flange, and a connecting piece, and is fixed to the ground cover concrete with anchor bolts.

Prior Art Documents

Patent Documents

[0004] [[ID=,27]]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] There is a need for a structure and method that can construct or manufacture a bridge more efficiently.

Means for Solving the Problems

[0006] One aspect of the present invention is concrete On one end along the longitudinal direction (long side direction) of the plate, a ground cover extending in the longitudinal direction is integrally formed Precast A base block and the other end of the base block along its longitudinal direction are placed adjacent to it. Precast in the shape of a flat concrete slab The floor slab blocks and the ends of the base blocks facing each other in the longitudinal direction, and the ends of the floor slab blocks facing each other in the longitudinal direction are supported. Precast This is a construction method for a bridge having abutment blocks. This bridge construction method involves arranging deck blocks adjacent to the other end of the curb block along the longitudinal direction of the curb block, and arranging them so that both ends of the curb block and both ends of the deck block facing each other in the longitudinal direction are supported by abutment blocks, thereby enabling the construction of the bridge more easily and at a lower cost.

[0007] The curb blocks, deck blocks, and abutment blocks may be made of concrete and may be supplied as precast (prefabricated) products manufactured in a factory. These curb blocks and abutment blocks are each included in one embodiment of the present invention.

[0008] The curb blocks and deck blocks are supported at both longitudinal ends by abutment blocks. Therefore, the curb blocks and deck blocks possess sufficient strength to form a superstructure that supports the upper part of the bridge. Consequently, the curb blocks and deck blocks may constitute the superstructure without the use of other main structural members such as steel girders. The curb blocks have a greater weight per unit length than deck blocks due to the curb they provide. Therefore, the width of the curb blocks may be narrower than that of the deck blocks, reducing the required capacity of cranes and other equipment used in construction, allowing for more efficient and cost-effective bridge construction.

[0009] The curb block may include a plurality of holes provided at regular intervals on the upper surface of the curb for inserting posts such as those for a protective fence. The bridge manufacturing method may include attaching the protective fence by inserting the posts of the protective fence into the plurality of holes. This allows for even more efficient construction of the bridge. Each of the plurality of holes may include a first hole with a large diameter and a bottom into which a post is inserted, and a second hole with a smaller diameter that extends from the bottom of the first hole to penetrate the lower surface or side of the curb block. The lower surface or side of the curb block is the part that faces the object that the bridge crosses, such as a river, and no interference with other structures is expected. Therefore, during construction, after construction, and before construction, drainage can be performed from the post holes through the second holes in the curb block.

[0010] The curb block may have drainage holes that penetrate the curb block in the inner plate portion of the curb. The curb block, with its combination of curb and plate portion, has an L-shaped cross-section, making it easier to maintain strength relative to the floor plate block, and is located at the edge of the road surface formed by the bridge. In addition, the lower surface of the curb block faces the object that the bridge crosses, such as a river, and no interference with other structures is expected. Therefore, drainage holes can be provided simply by holes that penetrate the plate portion. The drainage holes may have a wider opening (larger diameter) on the lower side than on the upper side. The curb block may have at least a portion of the curb cut out so that it reaches the inner plate portion of the curb. The cut-out portion can be used as a drainage opening.

[0011] The curb blocks may have connecting holes for inserting connectors to the abutment blocks, which penetrate the inner plate portion of the curb near both ends facing each other in the longitudinal direction. The bridge manufacturing method may include connecting the curb blocks to the abutment blocks located at both ends via the connecting holes. The abutment blocks located at both ends of the bridge can be connected to each other via the L-shaped, high-strength curb blocks, providing a more structurally stable bridge.

[0012] The abutment block may include rising portions that are located at one end of the floor portion inside the curb of the curb block in the longitudinal direction, and at one end of the deck slab block facing the longitudinal direction. The bridge manufacturing method may include arranging the curb block and deck slab block so that their respective ends facing each other in the longitudinal direction are inside the rising portions of the abutment blocks positioned at those ends. The rising portions of the abutment block can support the curb block and deck slab block more stably.

[0013] A precast abutment block that constitutes the abutment of a bridge may have a foundation that supports the load of a superstructure block that extends longitudinally to constitute the superstructure of the bridge, a support surface provided on a part of the upper part of the foundation that supports the lower surface of one of the longitudinally opposing ends of the superstructure block, and a rising portion that rises from the support surface and corresponds to one of the longitudinally opposing end faces of the superstructure block. [Brief explanation of the drawing]

[0014] [Figure 1] A diagram showing an example of a bridge. [Figure 2] This diagram shows the construction process of the bridge shown in Figure 1. [Figure 3] A perspective view showing an example of a curb block. [Figure 4] Figure 3 shows the rear view (a), bottom view (b), and cross-sectional view (c) of the curb block. [Figure 5] A diagram showing the protective fence installed. [Figure 6] A perspective view showing an example of a bridge abutment block. [Figure 7] A diagram showing the bridge abutment block with the curb block attached. [Figure 8] A diagram showing several examples of bridge abutment blocks. [Modes for carrying out the invention]

[0015] Figure 1 shows an overview of a bridge (bridge, bridge structure) which is an example of the present invention. Figure 2 shows how the bridge 1 is manufactured (constructed). The bridge 1 is a structure that crosses over obstacles such as a river 2, and includes abutment blocks 10 arranged on both sides 3 of the river 2, a ground cover block 20 supported by the abutment blocks 10 on both sides and arranged to straddle the river 2, a floor slab block 30, and a protective fence (rail) 40 installed on the ground cover block 20. This bridge 1 is installed for the purpose of installing a road 4 etc. while avoiding small-scale obstacles such as a river 2 with a width of approximately 10 m or less. The ground cover block 20 and the floor slab block 30 constitute an upper structure 5 that supports the upper part of the bridge 1 (the structure of the part that crosses over the obstacle), and the abutment blocks 10 constitute a lower structure 6 that supports the upper structure 5. Therefore, the ground cover block 20 and the floor slab block 30 are used as upper structure blocks 50 with a length in the longitudinal direction (X direction) of approximately 10 m, or further, approximately 5 m or less, and spanning the abutment blocks 10 on both banks 3.

[0016] The ground cover blocks 20 arranged on both sides (both ends) in the width direction (Y direction) of the bridge 1 are concrete blocks in which a ground cover (ground cover part) 22 extending in the longitudinal direction X is integrally formed at one end 21a along the longitudinal direction (long side direction) X of a precast concrete slab 21, and may be prefabricated (precast) in a factory and mass-produced. The ground cover block 20 includes an end face 24 that is approximately L-shaped, a ground cover 22 that protrudes upward, and a plate part 23 that extends horizontally inward. The bridge 1 includes ground cover blocks 20 arranged symmetrically on the left and right at both ends, and these configurations are substantially common except for being symmetric about the left and right. Therefore, hereinafter, the ground cover block 20 on the left side of Figure 1 will be further described in more detail as an example.

[0017] The bridge 1 includes a floor slab block 30 disposed adjacent to the other end 21b along the longitudinal direction X of the ground covering block 20, and abutment blocks 10 that support both ends 29a and 29b facing the longitudinal direction X of the ground covering block 20 and both ends 39a and 39b facing the longitudinal direction X of the floor slab block 30, respectively. The floor slab block 30 is typically a PC board precast in a flat plate shape made of concrete, and may be prefabricated (precast) in a factory and mass-produced. The upper surface 31 of the floor slab block 30 may be flat, may be provided with an appropriate gradient for rainwater drainage, or may be provided with an appropriate pattern such as a grid or tiles for purposes such as anti-slip.

[0018] The floor slab block 30 is precast with a predetermined value in the range where the length (width) W3 in the Y direction is about 1 to 2 m, and one to several pieces are arranged side by side in the width direction Y according to the width of the bridge 1. For example, the width W3 of the floor slab block 30 is 1.5 m. The width W2 of the ground covering block 20 is narrower (shorter) than the width W3 of the floor slab block 30, and the lifting weight of the ground covering block 20 is the same as the weight of the floor slab block 30, or is set to have a weight difference such that it is not necessary to change the selection of the crane when constructing the bridge 1. An example of the width W2 of the ground covering block 20 is 600 mm, but it is not limited to this and may be about 1 m. The ground covering block 20, the floor slab block 30, and the floor slab blocks 30 are arranged side by side in the width direction Y, and they may be arranged such that their ends are in close contact, may be arranged with a packing or the like interposed therebetween, or may be arranged with an appropriate gap suitable for purposes such as drainage.

[0019] The abutment block 10 is also made of concrete and may be prefabricated (precast) in a factory and mass-produced. The width W1 of the abutment block 10 is also constant, and the lifting weight may be such that it is not necessary to change the selection of the crane when constructing the bridge 1. For example, the width W1 may be about 1 m. The abutment blocks 10 are arranged in a row such that they are the same as or longer than the total width of the ground covering block 20 and the floor slab block 30 that constitute the superstructure 5.

[0020] Figure 3 shows an excerpt of the curb block 20. Figure 4(a) shows the back surface 20a of the curb block 20, Figure 4(b) shows the bottom surface 20b of the curb block 20, and Figure 4(c) shows a cross-section of the curb (curb portion) 22 of the curb block 20. The curb block 20 has an end face 24 and a cross-section in the width direction Y that is approximately L-shaped, and includes a flat plate portion 23 of appropriate thickness and a curb 22 protruding upward from the plate portion 23. An example of the thickness of the plate portion 23 is 350 mm, and an example of the thickness of the curb 22 is 600 mm, but the dimensions are not limited to these.

[0021] The curb block 20 includes a plurality of holes 26 provided at regular intervals in the upper surface 22a of the curb 22 for inserting the support posts 41 of the protective fence 40. As shown in Figure 4(c), each of these holes 26 includes a large-diameter, for example, 160φ first hole 26a with a bottom for inserting the support post 41, and a small-diameter, for example, 50φ second hole 26c extending from the bottom 26b of the first hole 26a to penetrate the lower surface (bottom surface) 20b of the curb block 29. The small-diameter second hole 26c for drainage may be provided to penetrate the side (back surface) 20a of the curb block 20.

[0022] Figure 5 shows the state in which the protective fence (balustrade) 40 is attached to the curb 22 by inserting the support posts 41 of the protective fence 40 into the holes 26 of the curb 22 of the curb block 20. When the curb block 20 is prefabricated in the factory, the holes 26 for installing the support posts 41 can be provided, and at the manufacturing site (construction site) of the bridge 1, the protective fence 40 can be installed simply by inserting the support posts 41 into the installation holes 26. Therefore, the effort of driving anchors into the curb block 20 or fixing the support 41 with bolts, etc., can be eliminated. After inserting the support posts 41 into the installation holes 26, the gap between the support posts 41 and the holes 26 may be filled with mortar or the like. Alternatively, if the protective fence 40 can be attached to the curb block 20 with sufficient strength by inserting the support posts 41 into the installation holes 26, for example until they reach the bottom 26b, the gap between the support posts 41 and the holes 26 does not need to be filled. Even if rainwater or condensation enters the installation holes 26, it is automatically drained through the drainage holes 26c, thus preventing corrosion of the support columns 41 due to rust, etc. In this bridge 1, there is basically no need for other support structures to support the curb blocks 20 from the bottom surface (underside) 20b. Therefore, since the bottom surface 20b faces the river 2 in this example, it can be easily drained by providing holes 26c that penetrate the bottom surface 20b. The back surface (side surface) 20a of the curb block 20 does not interfere with other structures and can also drain into the river 2. For this reason, the holes 26c that penetrate for drainage may be provided on the back surface 20a. These drainage holes 26c also function as drainage holes 26 when the curb blocks 20 are stored outdoors or transported.

[0023] The curb block 20 further includes drainage holes 27 provided in the inner plate portion 23 of the curb 22, penetrating the curb block 20. These drainage holes 27 allow rainwater from the upper surface of the plate portion 23 of the curb block 20 and the upper surface 31 of the adjacent floor plate block 30 to be drained into the river 2 from the bottom surface 20b of the curb block 20. The diameter of the holes (openings) in the bottom surface 20b may be larger than the diameter (opening) of the upper surface. This prevents the drainage holes 27 from becoming clogged with debris or gravel. The curb block 20 has an L-shaped cross-section including the curb 22 and is stronger than the floor plate block 30. Therefore, it is easy to maintain strength even if a structure that omits part of the cross-section, such as the drainage holes 27, is included. Furthermore, the area near the curb 22 of the curb block 20 does not interfere with the passage of heavy objects such as vehicles on the floor plate block 30, making it a suitable area for providing drainage holes 27.

[0024] The curb block 20 may further include a notch 25, which is cut out so that at least a portion of the curb 22 reaches the inner plate portion 23 of the curb 22. When a large amount of rainwater occurs and the drainage holes 27 are insufficient to drain it, the large amount of rainwater can be directly drained into the river 2 through the notch 25. Therefore, it is possible to prevent large amounts of rainwater from accumulating on the bridge 1 and obstructing traffic, and to prevent large amounts of rainwater from being added to the bridge 1 as a load.

[0025] The curb block 20 may further have connecting holes 28 provided near both ends 29a and 29b facing each other in the longitudinal direction X, penetrating the inner plate portion 23 of the curb 22. Connecting devices for the abutment block 10 can be inserted through the connecting holes 28, allowing the abutment blocks 10 grounded on both banks 3 to be firmly connected by the high-strength curb block 20. Even if conditions occur that make the abutment blocks 10 prone to shifting position due to earthquakes or flooding, the distance between the abutment blocks 10 on both banks 3 can be maintained via the curb blocks 20 on both sides, thereby preventing the deck plate blocks 30 from falling.

[0026] Figure 6 shows an example of a precast abutment block 10 that constitutes the abutment (substructure) 6 of the bridge 1. This abutment block 10 has a foundation (main body) 11 that supports the load of the superstructure block 50, in this example the curb block 20 and the deck block 30, which extends longitudinally to constitute the superstructure 5 of the bridge 1; a support surface 12 provided on a part of the upper part of the foundation 11, which supports the lower surface of one of the ends of the superstructure block 50 that are opposite each other in the longitudinal direction X; and a rising portion 13 that rises up from the support surface 12 and corresponds to one of the end faces of the superstructure block 50 in the longitudinal direction X. In this example, the support surface 12 supports one of the ends 29a and 29b of the curb block 20 and the lower surface (bottom surface) of one of the ends 39a and 39b of the floor slab block 30, and the rising portion 13 contacts one of the ends 29a and 29b of the curb block 20 and the other end 39a and 39b of the floor slab block 30, preventing these blocks 20 and 30 from moving in the longitudinal direction X. An anchor hole 18 may be provided on the support surface 12 of the abutment block 10 at a position opposite to the connection hole 28 provided in the curb block 20. The abutment block 10 shown in Figure 6 is an example of a gravity type, but the abutment block 10 may also have an L-shaped or inverted T-shaped foundation.

[0027] Figure 7 shows the abutment block 10 combined with the curb block 20. The bridge 1 can be constructed by placing the curb block 20 on top of the abutment block 10 such that the bottom surface 29c of one end 29a of the curb block 20 is placed on the upper support surface 12 of the foundation 11 of the abutment block 10, and the end surface 29d of the other end 29a is in contact with the rising section 13. The rising section 13 acts as a stopper, preventing the curb block 20 from moving in the longitudinal direction X. The deck slab block 30 can be mounted on the abutment block 10 in the same way. Packing or the like may be placed between the abutment block 10 and the curb block 20 or deck slab block 30.

[0028] Furthermore, anchors 19, such as reinforcing bars, may be inserted through the connecting holes 28 provided in the curb block 20 and the anchor holes 18 provided in the support surface 12 of the abutment block 10, and these holes 28 and 18 may be filled with mortar or the like. The anchors 19 can suppress the movement of the abutment blocks 10 on both banks relative to the curb block 20, and even if a situation occurs in which the abutment blocks 10 move due to floods, earthquakes, etc., the movement of the abutment blocks 10 can be suppressed, preventing the deck slab blocks 30 from falling from the abutment blocks 10.

[0029] Furthermore, by designing the upper surface 13a of the rising section 13 to match the height of the upper surface 23a of the plate section 23 of the curb block 20, or the upper surface 31 of the deck block 30, the bridge 1 can be constructed without any step difference occurring between the upper surfaces of the curb block 20 and the deck block 30 relative to the abutment block 10. When constructing a road 4 such as asphalt, a step-free base can be provided for this purpose.

[0030] The foundation 11 of the abutment block 10 may have sufficient weight and contact area to provide stability as the foundation of the bridge 1. Therefore, one example of the foundation 11 is a trapezoidal or semi-trapezoidal cross-section where the contact surface (bottom surface) 15 in contact with the ground 9 is wider than the upper surface. The shape of the foundation 11 is not limited to a trapezoid; it may also be rectangular, or have a contact surface that widens into an inverted T-shape. Figures 8(a) to 8(c) show several examples of gravity-type abutment blocks 10. The abutment blocks 10 may be placed on a sandbar in a river or within a river. As shown in Figure 8(b), a configuration may be adopted in which multiple bridge structures 1 can be constructed in a continuous manner via abutment blocks 10 that include support surfaces 12 on both sides, enabling bridge construction.

[0031] As described above, the bridge 1 in this example is manufactured using a curb block 20 in which a curb 22 extending in the longitudinal direction X is integrally formed at one end 21a along the long side direction X of a precast concrete slab 21. One or more deck slab blocks 30 are arranged adjacent to the other end 21b along the longitudinal direction X of the curb block 20, and the ends 29a and 29b of the curb block 20 facing the longitudinal direction X, and the ends 39a and 39b of the deck slab block 30 facing the longitudinal direction X, are supported by the abutment blocks 10 on both banks 3, thereby enabling the easy manufacture of the bridge 1. Since the curb block 20 and the deck slab block 30 can each be supported by the abutment blocks 10 on both banks, by designing these blocks 20 and 30 to have sufficient strength as a superstructure, these blocks 20 and 30 can constitute a superstructure that supports the upper part of the bridge 1. Therefore, there is no need to pre-install members (longitudinal girders) that support the deck material such as steel girders as the superstructure of the bridge, and the bridge 1 can be manufactured efficiently in a short period of time. In addition, in the bridge 1, protective fences 40 including handrails and guardrails are often installed on the curb 22, but by pre-installing holes 26 for inserting support columns 41 into the curb 22 at the factory, the time required to install the protective fences 40 can be shortened, and the bridge 1 can be manufactured even more efficiently.

[0032] Bridge 1 in this example can be used as a bridge over a small river 2 of approximately 10m or less, and each of the curb blocks 20 and deck blocks 30 can be laid as a single piece in the river crossing direction, that is, each block 20 and 30 can be laid on the abutment blocks 10 on both banks 3. Bridge 1 in this example is constructed by combining curb blocks 20, which consist of precast decks integrated with curb 22, and deck blocks 30, which consist of decks without curbs. Furthermore, the width W2 of the curb blocks 20, which consist of curbs integrated with curbs, is narrower than the width W3 of the deck blocks 30 without curbs. When constructing on site, the maximum crane load is generally determined by the weight of the decks laid out, but the curb blocks 20, which consist of curbs 22 and decks 23 integrated, are heavier because of the attached curb. For this reason, by narrowing the width W2 of the curb blocks 20, Bridge 1 can be constructed using the same crane as the deck blocks 30.

[0033] Furthermore, bridges (bridge structures) 1 are basically fitted with railings (protective fences) 3 to prevent falls, but in order to install the railings, a curb is needed to support them. Traditionally, one way to install the curb is to cast it in place after the deck slabs have been installed. Casting in place lengthens the construction period and delays the opening of the bridge. In addition, the installation of supports for railings and protective fences requires additional construction time, such as driving anchors into the curb after casting in place to attach the supports. In the curb block 20 of this example, holes 26 for attaching supports 41 for railings and protective fences are drilled in advance in the curb 22, allowing bridge 1 to be constructed in a short period of time. Moreover, it can be constructed at a lower cost than when anchors are installed later in a cast-in-place method.

[0034] If holes 26 for railings or guardrails are provided in precast curb blocks 20 with a curb, there is a risk that the concrete may burst if water accumulates and freezes in the holes 26 during factory storage or on-site construction. Therefore, by drilling holes 26 for installing support posts, and further drilling holes 26a with a larger diameter for inserting the support posts 41 of the guardrail 40, and holes 26c with a smaller diameter, the holes should penetrate all the way to the bottom surface 20b of the curb block 20, allowing water to drain from the bottom and preventing damage. Small-diameter drainage holes 26c may also be provided horizontally from the holes 26a of the guardrail. Drainage can also be provided facing outwards from the bridge, but there is a possibility that mortar packed during the construction of the guardrail may drip from the drainage and spoil the appearance, so it is desirable that the drainage holes 26c open to the bottom surface 20b.

[0035] Furthermore, since the river 2 generally slopes from upstream to downstream, rainwater that falls on the deck of the bridge 1 flows downstream and accumulates in the curb. Therefore, in the bridge 1 of this example, rainwater can be drained into the river 2 by partially providing cuts 25 in the curb 22. Alternatively, drainage holes 27 may be provided along with or instead of the cuts 25 to allow water to drain.

[0036] The above discloses a bridge having a curb block with a curb extending in the longitudinal direction integrally formed on one end of a precast concrete slab along the longitudinal direction, a deck block positioned adjacent to the other end of the curb block along the longitudinal direction, and abutment blocks supporting both ends of the curb block and both ends of the deck block facing each other in the longitudinal direction. The curb block and the deck block may constitute a superstructure that supports the upper part of the bridge. The width of the curb block may be narrower than the width of the deck block. The curb block may include a plurality of holes provided at regular intervals on the upper surface of the curb for inserting support columns. Each of the plurality of holes may include a large-diameter first hole with a bottom into which the support column will be inserted, and a small-diameter second hole extending from the bottom of the first hole to penetrate the lower surface or side surface of the curb block. The curb block may have drainage holes in the inner plate portion of the curb that penetrate the curb block. The curb block may be cut out so that at least a portion of the curb reaches the inner plate portion of the curb. The curb block may have connecting holes for inserting connectors to the abutment block, which penetrate the inner plate portion of the curb near the longitudinally opposing ends. The abutment block may include rising portions corresponding to one of the longitudinally opposing ends of the inner floor portion of the curb block and one of the longitudinally opposing ends of the floor plate block.

[0037] The above discloses a curb block in which a curb extending in the longitudinal direction is integrally formed on one end of a precast concrete slab along the longitudinal direction, and the curb block, together with a floor slab block positioned adjacent to the other end of the curb block along the longitudinal direction, has both ends facing each other in the longitudinal direction supported by abutment blocks to constitute a bridge. The curb block may be narrower in width than the floor slab block. The curb block may include a plurality of holes provided at regular intervals on the upper surface of the curb for inserting support columns. Each of the plurality of holes in the curb block may include a first hole with a large diameter and a bottom for inserting the support column, and a second hole with a small diameter extending from the bottom of the first hole to penetrate the lower surface or side surface of the curb block. The curb block may have drainage holes that penetrate the curb block in the inner plate portion of the curb. The curb block may be cut out such that at least a portion of the curb reaches the inner plate portion of the curb. The curb block may be provided with connecting holes for inserting connectors to the abutment block, which penetrate the inner plate portion of the curb near the longitudinally opposing ends of the curb block.

[0038] The above discloses a precast abutment block that constitutes the abutment of a bridge, comprising: a foundation portion that supports the load of a superstructure block extending longitudinally to constitute the superstructure of the bridge; a support surface provided on a part of the upper part of the foundation portion that supports the lower surface of one of the longitudinally opposing ends of the superstructure block; and a rising portion that rises from the support surface and corresponds to one of the longitudinally opposing end faces of the superstructure block.

[0039] The above discloses a method for manufacturing a bridge, which includes arranging a base block, in which a base extending in the longitudinal direction is integrally formed at one end of a precast concrete slab along the longitudinal direction, and arranging a base block adjacent to the other end of the base block along the longitudinal direction, such that both ends of the base block and both ends of the base block facing each other in the longitudinal direction are supported by abutment blocks. The method may also include forming a superstructure that supports the upper part of the bridge with the base block and the base block. The base block may include a plurality of holes provided at regular intervals on the upper surface of the base for inserting support columns, and the method may include inserting support columns of a protective fence into the plurality of holes to attach the protective fence. The base block may also be provided with connecting holes for inserting connectors to the abutment blocks, which penetrate the inner plate portion of the base near both ends facing each other in the longitudinal direction, and the method may include connecting the base block to the abutment blocks located at both ends thereof through the connecting holes. The abutment block may include rising portions corresponding to one of the longitudinal ends of the floor portion inside the curb of the curb block and one of the longitudinally opposing ends of the floor plate block, and the curb block and the floor plate block may be arranged such that their respective longitudinally opposing ends are inside the rising portions of the abutment blocks positioned at those ends. [Explanation of symbols]

[0040] 1 bridge, 20 curb blocks, 30 deck blocks

Claims

1. A method for manufacturing a bridge, comprising: a precast curb block in which a curb extending in the longitudinal direction is integrally formed at one end along the longitudinal direction of the concrete slab; a precast concrete slab block in the shape of a flat plate adjacent to the other end along the longitudinal direction of the curb block; and arranging the bridge so that both ends of the curb block and both ends of the slab block facing each other in the longitudinal direction are supported by precast abutment blocks, The aforementioned curb block has connecting holes provided near both ends facing each other in the longitudinal direction, for inserting connecting devices to the abutment block from above, with these holes penetrating the inner plate portion of the curb. The abutment block includes a support surface and a portion rising from the support surface, and the support surface is provided with an insertion hole for inserting the connector from above. A method for manufacturing a bridge, comprising placing the longitudinal end of the curb block against the raised portion, inserting the connector from the upper side of the curb block through the connecting hole into the insertion holes of the abutment blocks located at both ends thereof, and connecting the curb block and the abutment block by filling the connecting hole and the insertion hole with mortar.

2. In claim 1, A method for manufacturing a bridge, comprising forming a superstructure that supports the upper part of the bridge using the curb blocks and the floor slab blocks.

3. In claim 1, A method for manufacturing a bridge, comprising arranging the curb block and the deck slab block such that their respective ends facing each other in the longitudinal direction are inside the rising portions of the abutment blocks positioned at those ends.

4. In claim 1, The aforementioned curb block includes a plurality of holes provided at regular intervals on the upper surface of the curb for inserting support columns, A method for manufacturing a bridge, comprising inserting the posts of a protective fence into the plurality of holes and attaching the protective fence.

5. A precast curb block having a curb extending in the longitudinal direction integrally formed on one end of the concrete slab along the longitudinal direction, A concrete, flat, precast floor slab block is positioned adjacent to the other end of the aforementioned curb block along its longitudinal direction, The bridge comprises precast abutment blocks that support both ends of the curb block facing each other in the longitudinal direction and both ends of the deck slab block facing each other in the longitudinal direction, The curb block includes, near both ends facing each other in the longitudinal direction, connecting holes for inserting a connector to the abutment block from above, which are provided so as to penetrate the inner plate portion of the curb. A bridge in which the abutment block includes a support surface and a portion rising from the support surface, the support surface includes an insertion hole for inserting the connector from above, the longitudinal end of the curb block is against the rising portion, and the curb block and the abutment block are connected from above the curb block through the connection hole, by the connector inserted into the insertion holes of the abutment blocks located at both ends thereof, and by mortar filling the connection hole and the insertion hole.

6. In claim 5, A bridge in which the aforementioned curb blocks and floor slab blocks constitute a superstructure that supports the upper part of the bridge.

7. In claim 5, A bridge in which the width of the curb block is narrower than the width of the floor slab block.

8. In claim 5, The bridge comprises a curb block including a plurality of holes provided at regular intervals on the upper surface of the curb for inserting support columns.

9. A precast curb block as described in claim 5.

10. A precast curb block in which a curb extending in the longitudinal direction is integrally formed at one end of the concrete slab along the longitudinal direction, A bridge abutment block, with both ends facing each other in the longitudinal direction, is precast concrete flat slab-shaped floor block positioned adjacent to the other end along the longitudinal direction of the aforementioned curb block, and the bridge is formed by being supported by the support surface of the bridge abutment block, which includes a support surface and a portion rising from the support surface. A curb block having connecting holes provided in the support surface near both ends facing each other in the longitudinal direction, into which a connector is inserted from above with the longitudinal end of the abutment block against the raised portion of the abutment block, and which are filled with mortar, and the connecting holes are provided so as to penetrate the inner plate portion of the curb.

11. In claim 10, A curb block that is narrower in width than the aforementioned floor slab block.

12. In claim 10 or 11, A curb block comprising a plurality of holes provided at regular intervals on the upper surface of the curb for inserting support columns.

13. A precast abutment block that constitutes the bridge abutment of a bridge, A foundation that supports the load of superstructure blocks that extend longitudinally to constitute the superstructure of a bridge, A support surface provided on a part of the upper part of the foundation, which supports one of the lower surfaces of both ends of the superstructure block facing each other in the longitudinal direction, The portion rising from the support surface has a rising portion that corresponds to one end face of the longitudinal direction of the superstructure block, The superstructure block includes a precast curb block with a curb extending in the longitudinal direction integrally formed at one end of the concrete slab along the longitudinal direction, A bridge abutment block, wherein the longitudinal end of the curb block is placed against the support surface, and the curb block includes an insertion hole for inserting a connector from the upper side of the curb block through a connecting hole in the curb block and filling it with mortar.

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