JP4259977B2 - Three-dimensional viaduct structure and its construction method - Google Patents

Description

  The present invention relates to a three-dimensional viaduct structure and a construction method thereof, and more particularly, to a three-dimensional viaduct structure using a precast concrete member and a construction method thereof.

  In general, the continuous three-dimensional viaduct is constructed by cast-in-place concrete with a three- or four-diameter standard rigid frame structure composed of columns, beams and floor slabs for reasons such as economy.

  However, in recent years, the case of adopting curvilinear shape characteristics has been increased from the viewpoint of landscape consideration, and this has become a factor that causes the complexity of construction and the increase in construction costs.

As one of the solutions, prefabrication as shown in Patent Document 1 has been proposed.
JP-A-11-13015

  However, in the proposal as shown in the above-mentioned Patent Document 1, the precast concrete is made only of underground beams and column members, and the girder member and the protruding part floor board are made of half precast, and the upper part is made of post-cast concrete. A half-floor must be formed, and significant labor savings and shortening of the construction period cannot be expected.

  In addition, when the girder member is bridged on the column member, the column member must be securely fixed at the base so that the column member does not fall down. This is a construction effort.

  Furthermore, if the base of the column member is fixed securely, it becomes difficult to adjust the joining position error between the beam member and the column member, which is one factor that hinders the precast concrete of the beam member.

  The purpose of the present invention is a three-dimensional viaduct that can be used for the upper construction, the joints can be simplified, the joint position error of the beam can be easily corrected, the labor can be saved, and the construction period can be shortened with the pier temporarily fixed. The object is to provide a structure and its construction method.

In order to achieve the above object, a three-dimensional viaduct structure according to the present invention includes a bridge pier that is erected on the ground or a foundation, a vertical beam that is laid and supported on the bridge pier in the direction of the bridge axis, and the bridge shaft that is supported by the vertical beam. In a three-dimensional viaduct structure having a cross beam constructed in a crossing direction and a slab constructed on the cross beam,
At least the pier and the longitudinal beam are made of precast concrete,
The longitudinal beam is a half arch beam having an attachment portion to the pier and a pair of half arch portions divided in half by arch tops extending from the attachment portion to both sides. .

  According to the present invention, at least the bridge pier and the vertical beam are made of precast concrete, and the vertical beam includes an attachment portion to the pier and a pair of half arch portions divided in half by arch tops extending from the attachment portion to both sides. By having a half arch beam with the vertical beam assembled on the pier, it does not apply a load in the direction in which the vertical beam collapses against the pier, and the pier can stand in a well-balanced state, Construction of the upper part can be performed in a temporarily fixed state with simplified installation of the pier base, and the connection between the vertical beams is connected at the arch top position where the bending load is relatively small, simplifying the joint In addition, the joining position error between the longitudinal beams can be easily adjusted since the base of the pier is in a temporarily fixed state, and the construction can be simplified and the construction period can be shortened. .

  In the present invention, the bridge pier may be formed narrow in the bridge axis direction and wide in the crossing direction with the bridge axis.

  By adopting such a configuration, when the space between the piers is widened and the space directly under the viaduct is used for a parking lot or the like, the use efficiency can be improved compared to the conventional column structure because of the thin wall structure.

  Moreover, since the bridge pier is formed wide in the direction intersecting the bridge axis, the load bearing performance in the direction orthogonal to the bridge axis can be improved.

The construction method of the three-dimensional viaduct structure of the present invention includes a step of temporarily installing and fixing a pier made of precast concrete on the ground or foundation,
The mounting portion of the pre-cast concrete half arch beam having a pair of half arch portions halved at the top of the arch extending on both sides from the mounting portion to the pier is installed on the pier and connected to the pier And connecting the ends of the adjacent halved arch beams to support the vertical beam in the bridge axis direction on the pier,
Constructing a horizontal beam on the vertical beam in a direction crossing the bridge axis, and building a slab on the horizontal beam;
After building the slab, excavating the ground and placing concrete to build the underground beam, fixing the pier,
It is characterized by including.

  According to the present invention, after a precast concrete pier is installed and temporarily fixed on the ground or foundation, a pair of halved arch portions that are halved at the top of the arch extending from the attachment portion to the pier on both sides. By installing the precast concrete half arch beam mounting part on the pier and connecting it to the pier, even if the pier is temporarily fixed, there is no load in the direction in which the half arch beam falls on the pier The bridge pier can be set up in an independent and well-balanced state.

  In this case, the half arch beam is in a state where the pair of half arch portions are connected at the top of the arch, and can be connected at a position where the bending load is relatively small. Connection can be performed with a simple joint.

  In this state, cross beams and slabs are built. After the slabs are built, the ground is excavated and concrete is laid, and underground beams are built and integrated with the piers.

  By constructing the upper construction with the pier temporarily fixed, and then constructing the underground beam, it is possible to save labor and shorten the construction period.

  Moreover, since the half arch beams can be connected to each other while the piers are temporarily fixed, the joining position error of the half arch beams can be easily adjusted.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1-8 is a figure which shows the three-dimensional hyperbridge structure which concerns on one embodiment of this invention.

  FIG. 1 is an overall schematic perspective view showing a three-dimensional viaduct structure according to the present embodiment.

  This three-dimensional viaduct structure 10 is used as, for example, a railway three-dimensional viaduct, and includes a foundation pile 12, an underground beam 14, a bridge pier 16, a half arch beam 18 that is a vertical beam, a horizontal beam 20, and a slab 22. And a sound insulation wall 24.

  As shown in FIGS. 3 and 4, the foundation piles 12 are provided at predetermined positions along the bridge axis direction in pairs in the direction perpendicular to the bridge axis direction at the standing position of the pier 16.

  The foundation pile 12 is constructed by selecting a reasonable construction method and pile type according to the ground conditions, and can be omitted particularly when the pier is erected on the hard ground.

  The underground beam 14 includes a pair of vertical underground beams 26 formed along the bridge axis direction at the standing position of the pier 16, and the standing position of the pair of pier 16 as shown in FIGS. 4 and 5. And a plurality of lateral underground beams 28 formed in a direction orthogonal to the bridge axis direction.

  Further, a part of the vertical underground beam 26 is formed in advance when the pier 16 is erected and connected to the foundation pile 12, and the remaining vertical underground beam 26 and the horizontal underground beam 28 are formed after the completion of the upper construction. And integrated with the pier 16.

  The underground beam 14 is constructed by placing cast-in-place concrete.

  The pier 16 is made of precast concrete and has a width W1 narrow in the bridge axis direction and a width W2 wide in the direction intersecting the bridge axis.

  Thus, when the width W1 in the bridge axis direction of the pier 16 is made narrow, when using the space between the piers 16 as a parking lot, the space can be used effectively.

  Further, by making the width W2 in the direction intersecting the bridge axis wide, it is possible to enhance the load bearing performance in the direction intersecting the bridge axis and sufficiently withstand the load during an earthquake.

  The bridge pier 16 has a wide leg 30 at the lower end, and the leg 30 is fixed to the underground beam 14 via an anchor bolt 32 as shown in FIG.

  Further, a support portion 34 for attaching and supporting the half arch beam 18 is formed at the upper end of the pier 16 in a state of spreading upward.

  The half arch beam 18 is made of precast concrete, and as shown in FIG. 2, the half arch beam 18 is halved by an attachment portion 36 to the pier 16 and an arch top portion extending from the attachment portion 36 to both sides in the bridge axis direction. A pair of half arch portions 38.

  The mounting portion 36 has a shape substantially corresponding to the upper surface of the support portion 34 of the pier 16, and is connected to the support portion 34 of the pier 16 via a PC steel rod 40 as shown in FIGS. 3 and 7. It is supposed to be fixed.

  The pair of half arch portions 38 has a width corresponding to the width W2 of the pier 16 and the PC steel rod 42 is placed at the end of the half arch portion 38 provided adjacent to each end and the top of the arch. It is connected and fixed via.

  Further, a beam receiving base 44 for supporting the cross beam 20 is formed on the upper surface of the intermediate position of each half arch portion 38 so as to protrude upward.

  In addition, the half arch beam 18 is formed in a substantially Y shape when mounted on the pier 16, and the left and right balance is achieved when the pier 16 is erected. Since 16 becomes a state which can become independent, upper construction is possible even if the fixed state in the leg part 30 of the bridge pier 16 is a temporarily fixed state.

  Furthermore, since the end portions of the adjacent half arch portions 38 are connected to each other at the arch top portion where the bending load is relatively small, the PC steel rod 42 that is the joint can be simplified.

  In addition, since the half arch beam 18 forms an arch-shaped vertical beam in an assembled state, it can be excellent in scenery.

  The horizontal beam 20 is hung on the beam receiving base 44 of the adjacent half arch beam 18 in a direction crossing the bridge axis direction, and as shown in FIGS. It is connected and fixed to the beam 18.

  In addition, as shown in FIG.2 and FIG.5, the lower surface 48 of this cross beam 20 is in the state formed in the arch shape, and has become a favorable state on a landscape.

  The slab 22 is made of precast concrete. As shown in FIG. 8, the loop slabs 60 are overhanged at both ends and installed on the cross beam 20 and then adjoined by the space concrete 54 which is cast-in-place concrete. The slab 22 and the cross beam 20 are integrated with each other, and the slabs 22 in the crossing direction of the bridge axis are connected by a PC steel rod.

  The slab 22 may be formed by placing cast-in-place concrete on a thin precast concrete plate.

  The sound insulation wall 24 is attached to both sides of the slab 22 along the bridge axis direction.

  Next, a construction method of such a three-dimensional viaduct structure will be described with reference to FIGS.

  First, as shown in FIG. 9 (1), at the position where the pier 16 is erected, a plurality of, for example, four foundation piles 12 are constructed, and the foundation piles 12 are integrated in the bridge axis direction. The cast-in-place concrete is laid to construct two vertical underground beams 26.

  As shown in FIG. 2B, the vertical underground beam 26 is a part of the vertical underground beam and is in a narrow state.

  Next, as shown in FIG. 10, the pier 16 is installed on each longitudinal underground beam 26 located on each foundation pile 12, and the leg portion 30 of the pier 16 and the longitudinal underground beam 26 are connected.

  In this case, the connection between the longitudinal underground beam 26 and the pier 16 is temporarily fixed.

  Next, as shown in FIG. 11, the mounting portion 36 of the half arch beam 18 is placed on the support portion 34 of the standing pier 16, and the mounting portion 36 of the half arch beam 18 and the support portion of the pier 16 are mounted. 34 are connected and fixed, and the ends of the half arch portions 38 of the adjacent half arch beams 18 in the bridge axis direction are connected and fixed, and an arched vertical beam is installed on the bridge pier 16 in the bridge axis direction. , Support.

  In this case, since the half arch beam 18 projects in a balanced manner on both sides of the upper part of the pier, no load is applied to the pier 16 so that the leg 30 is temporarily fixed. The upper construction can be performed, and the connection position adjustment between the half arch beams 18 can be easily performed with the legs 30 temporarily fixed. Further, the connection between the half arch beams 18 can be performed. Since the connection is performed at the top of the arch and has a low load level, the joint structure between the half arch beams 18 can be simplified.

  Next, as shown in FIGS. 12A and 12B, the horizontal beam 20 is installed on the beam receiving base 44 of each half arch beam 18, and the half arch beam 18 and the horizontal beam 20 are connected and fixed to each other. The split arch beams 18 are connected to each other by a cross beam 20 in a direction orthogonal to the bridge axis direction.

  Next, the slabs 22 are installed on the cross beams 20 to connect the slabs 22 to each other, and sound insulation walls 24 are attached to both sides of the slabs 22.

  In this state, the construction of the ground part is finished, and then, as shown in FIGS. 13 (1) and (2), the remaining part of the vertical underground beam 26 and the ground of the horizontal underground beam 28 part are excavated, The vertical underground beam 26 and the horizontal underground beam 28 are constructed by placing cast-in-place concrete, and the underground beam 14 and the leg portion 30 of the bridge pier 16 are integrated and backfilled, whereby a one-span three-dimensional viaduct structure 10 is formed. The construction of the part will be completed.

  During the construction of the ground part of the first span, the foundation pile 12 and the vertical underground beam 26 of the next span are constructed, and the ground part of the next span is constructed during the construction of the underground beam of the first span. The construction can be labor-saving and the construction period can be shortened, enabling rapid construction.

  14 to 17 are views showing a three-dimensional hyperbridge structure according to another embodiment of the present invention.

  In this embodiment, as shown in FIG. 14, the three-dimensional viaduct is, for example, in a state of being inclined downward at a predetermined angle θ1 from the right side to the left side, and with a predetermined radius of curvature R as shown in FIG. It is in a state of curving.

  In this case, as shown in FIG. 16, by manufacturing a precast member in which one of the half arch beams 18, for example, the right half arch portion 38 is shifted by a height supplement portion 50 having a predetermined height, the left half arch beam 18 is manufactured. The height of the right half arch part 38 is made higher than the split arch part 38 so as to correspond to the gradient of the three-dimensional viaduct.

  Further, with the downward inclination of the slab 22, for example, a gap 52 is generated between the upper surface of the cross beam 20 and the lower surface of the right slab 22, but the slab 22 is connected to the slab 22 in the bridge axis direction. By filling this gap 52 with 54, it corresponds to the gradient of the three-dimensional viaduct.

  Further, as shown in FIG. 15 (1), the bending of the three-dimensional viaduct is dealt with by sequentially shortening the length of the inner slab 22 with respect to the outer slab 22 that is curved. ing.

  Thus, it is possible to easily cope with the longitudinal gradient and curvature of the three-dimensional viaduct.

  FIG. 18 is a diagram showing a three-dimensional hyperbridge structure according to another embodiment of the present invention.

  In this embodiment, the roadway 56 is formed on both sides of the three-dimensional viaduct structure 10, and two bridge piers 16 in a direction perpendicular to the bridge axis are arranged next to each other, and a lateral beam 58 provided on the half arch beam 18 is provided. The roadway 56 can be secured by forming a shape projecting from the pier 16 and supporting the slab 22 thereon.

  The present invention is not limited to the above-described embodiment, and can be modified into various forms within the scope of the gist of the present invention.

  For example, in the present embodiment, all the ground structures are made of precast concrete. However, the present invention is not limited to this example, and the slab and the cross beam can be made of half precast concrete and can be connected by cast-in-place concrete. It is.

  Moreover, in the said embodiment, although the railway solid viaduct structure was demonstrated, it is not restricted to this example, For example, it is also possible to apply to a road solid viaduct.

1 is an overall schematic perspective view showing a three-dimensional viaduct structure according to an embodiment of the present invention. It is a disassembled perspective view which shows the state of the ground structure of FIG. It is a side view of the three-dimensional hyperbridge structure of FIG. In the top view of FIG. 3, the right half is a figure which shows the state of a foundation pile and an underground beam. It is a front view of the three-dimensional viaduct structure of FIG.3 and FIG.4. It is an expanded sectional view which shows the connection state of the bridge pier and underground beam in FIG. It is the elements on larger scale which show the connection state of a half arch beam and a bridge pier, and the connection state of adjacent half arch beams. It is a partial expanded sectional view which shows the connection state with a half arch beam, a cross beam, and a slab. (1) is sectional drawing which shows the state which builds a foundation pile and a vertical underground beam, (2) is the top view. FIG. 10 is a side view showing a state where the pier is erected from the state of FIG. 9. It is a side view which shows the state which attached the half arch beam on the pier from the state of FIG. (1) is the side view which shows the state which attached the cross beam, the slab, and the sound insulation wall on the half arch beam from the state of FIG. 11, (2) is the front view. (1) is a side view showing a state where the underground beam is constructed and integrated with the pier from the state of FIG. 12, (2) is a front view thereof, and (3) is a plan view of the underground beam. is there. It is a side view which shows the three-dimensional hyperbridge structure which has the gradient which concerns on other embodiment of this invention. (1) is a plan view of FIG. 14 showing a three-dimensional viaduct structure in a curved state on a plane, and (2) is a schematic plan view showing a curvature state of (1). It is a side view which shows the half arch beam used for the solid viaduct structure of FIG.14 and FIG.15. It is a partial expanded sectional view which shows the relationship between a cross beam and a slab in the solid viaduct structure of FIG.14 and FIG.15. It is a front view which shows the three-dimensional hyperbridge structure which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Three-dimensional viaduct structure 12 Foundation pile 14 Underground beam 16 Bridge pier 18 Half arch beam 20, 58 Horizontal beam 22 Slab 26 Vertical underground beam 28 Horizontal underground beam 36 Mounting part 38 Half arch part

Claims (3)

Constructed on a bridge pier that is erected on the ground or foundation, a vertical beam that is installed and supported on the bridge pier in the direction of the bridge axis, a horizontal beam that is installed on the vertical beam in a direction crossing the bridge axis, and In the three-dimensional viaduct structure having a slab to be
At least the pier and the longitudinal beam are made of precast concrete,
The longitudinal beam is a half arch beam having an attachment portion to the pier and a pair of half arch portions divided in half by arch tops extending from the attachment portion to both sides. Three-dimensional hyperbridge structure. In claim 1,
The three-dimensional viaduct structure is characterized in that the bridge pier is formed narrow in the bridge axis direction and wide in the crossing direction with the bridge axis. A process of installing and temporarily fixing a precast concrete pier on the ground or foundation;
The mounting portion of the pre-cast concrete half arch beam having a pair of half arch portions halved at the top of the arch extending on both sides from the mounting portion to the pier is installed on the pier and connected to the pier And connecting the ends of the adjacent halved arch beams to support the vertical beam in the bridge axis direction on the pier,
Constructing a horizontal beam on the vertical beam in a direction crossing the bridge axis, and building a slab on the horizontal beam;
After building the slab, excavating the ground and placing concrete to build the underground beam, fixing the pier,
The construction method of the three-dimensional viaduct structure characterized by including.

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