JP4040901B2 - Three-dimensional intersection construction method and three-dimensional intersection - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-dimensional intersection construction method and a three-dimensional intersection.
[0002]
[Prior art]
Conventionally, road intersections in urban areas have been a major cause of traffic congestion. By making the passing traffic at the intersection and the right turn and left turn traffic three-dimensional, it is possible to pass the passing traffic without decelerating or stopping. On urban trunk lines, these three-dimensional intersections are constructed by either underpass or overpass methods.
[0003]
Conventionally, in order to construct a three-dimensional intersection with the overpass method, (1) there is a method of building a pier / girder after building a foundation such as a pile or a caisson at that place by blocking the traffic into a construction yard. . Recently, (2) a method of constructing a pedestal on a road and constructing piers / foundations therefrom, and a rapid construction method of assembling a block-shaped precast box have been proposed.
[0004]
[Problems to be solved by the invention]
However, in the method (1), a period of several years is required from the start of construction to completion. During the construction period of several years, traffic congestion will occur due to lane restrictions, resulting in further traffic congestion. The method (2) requires a period for assembling / removing the gantry on the road.
[0005]
The present invention has been made in view of such problems, and its object is to provide a three-dimensional intersection construction method, a three-dimensional intersection, and a pier structure that can shorten the work period by simultaneously performing foundation work and girder production. There is.
[0006]
[Means for Solving the Problems]
According to a first aspect of the invention for achieving the above object, a step (a) for producing a girder on a movable gantry, a supporting means provided in the opening of the foundation hole in the foundation hole, A fixed elevating means and a hanging jig held by the elevating means and suspended in the foundation hole are attached, and the lifting jig is lowered using the elevating means every time one lot is constructed. by building piers for each lot in order from the bottom on the lifting jig, the underlying hole in the pier a built write no step (b), moving the moving platform, the digit above the pier A step (c) for placing the bridge pier and the step (d) for raising the bridge pier from the foundation hole and supporting the girder with the bridge pier.
[0007]
In the step (a), a girder is produced on a movable gantry arranged at a position where traffic can be interrupted to the minimum. In the step (b), a suspension jig having a lifting jack is inserted into the foundation hole formed at the planned position of the pier, and the pier is constructed on the suspension jig while the suspension jig is lowered by the lifting jack. The hanging jig is, for example, a plate-like connection frame fixed to the lower ends of a plurality of hanging rods, and a lifting jack is provided on each hanging rod. The completed pier is suspended in the foundation hole.
[0008]
In the step (c), a girder is arranged above the pier built in the foundation hole using a movable frame. For example, the movable gantry is provided with a water caster or an air caster at the lower end of the gantry. In the step (d), the lifting jig on which the pier is mounted is lifted by using a lifting jack, and the girder is supported on the pier.
[0009]
In the first invention, a girder is produced on a movable gantry, and a pier is built in a foundation hole, and then the girder is arranged above the pier by moving the movable gantry. Then, the pier is raised from the foundation hole and the girder is supported by the pier.
[0010]
The second invention is a three-dimensional intersection characterized by being constructed by the three-dimensional intersection construction method of the first invention.
[0012]
The foundation hole is excavated in the ground below the planned pier position. The support means is, for example, a cylindrical support frame and a support bracket provided on the upper part of the support frame. The supporting means supports the weight of a bridge pier or a girder laid on the pier via the lifting means and the hanging jig. A lifting jack or the like is used as the lifting means. The lifting jack is fixed to a support bracket or the like that is a support member. The hanging jig includes, for example, a plurality of hanging rods held by a lifting jack and a peer connection frame provided at the lower end of the hanging rod. The pier is made on the peer connection frame. By using a lifting jack, the suspension jig is moved up and down inside the foundation hole, so that the pier constructed on the suspension jig is taken in and out of the foundation hole.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an elevation view of a three-dimensional intersection road 1. As shown in FIG. 1, the three-dimensional intersection road 1 is composed of a central girder 7, a ramp girder 9a, a ramp girder 9b, a pier 27, a pier 33, and the like.
[0015]
FIG. 2 is a diagram illustrating a process of forming the central beam 7 on the movable gantry 11. In order to construct the three-dimensional intersection road 1, first, appropriate foundation work is performed on the ground 5 below the road surface 3, and the cylindrical foundation hole 15 is formed below the planned positions of the pier 27 and the pier 33. Moreover, the movable mount 11 is installed on the road surface 3 of the planned position of the ramp part girder 9a.
[0016]
The moving gantry 11 is used as a girder manufacturing frame when the central beam 7 and the ramp girder 9a are manufactured, and as a moving frame when moving. The movable gantry 11 has a water caster 13 at the lower part, and has a structure that can support the central part girder 7 and the ramp part girder 9a. At the time of movement, the movable base 11 is pulled by a tire shovel or winch (not shown) while injecting a working medium into the water caster 13.
[0017]
3 and 4 are elevational views of the cross section of the basic hole 15. 3 and 4 are cross-sectional views taken along line AA in FIG. As shown in FIG. 2, the central girder 7 is formed by using the movable gantry 11 as a work yard, and at the same time, as shown in FIGS. 3 and 4, the pier 27 and the pier 33 are built inside the foundation hole 15.
[0018]
In order to construct the pier 27 and the pier 33 in the foundation hole 15, as shown in FIG. 3, first, on the top of the lining segment 17 of the foundation hole 15, a cylindrical shape having a larger diameter than the lining segment 17. A support frame 19 is attached. The diameter of the opening at the lower end surface of the support frame 19 is the same as the inner diameter of the lining segment 17. Two support brackets 21 are fixed to the upper end portion of the support frame 19. For example, the support bracket 21 is provided with a triangular support member 22 on a rectangular frame-shaped main body 20. The support member 22 is provided in the lower part of the main body 20 on the side facing the ground 5, and the horizontal member of the support member 22 is fixed to the support frame 19.
[0019]
Two lifting jacks 25 are fixed to the main bodies 20 of the two support brackets 21, respectively. Each of the four lifting jacks 25 holds and lifts the peer suspension rod 23. A flat peer connection frame 29 is fixed to the lower end of the peer suspension rod 23. The support frame 19 supports the weight of the bridge pier 27 or the pier 33 and the girder installed via the support member 22, the peer suspension rod 23, and the like.
[0020]
Next, the pier 27 and the pier 33 are constructed on the peer connection frame 29. The pier 27 (33) is constructed for each lot in order from the bottom. As shown in FIGS. 3 and 4, when the lower part of the pier 27 (33) is constructed, the pier lifting rod 25 is used to construct the pier 27, the peer connection frame 29, and the pier 27 (33) every time one lot is constructed. ) Is lowered.
[0021]
FIG. 5 is a cross-sectional view of the pier 27 and the pier 33 with the pier saddle portion 31 installed. After the pier 27 (33) is built in the foundation hole 15, the pier saddle portion 31 is fixed to the upper end of the pier 27 (33) as shown in FIG. The pier 27 (33) is configured so that the upper end of the pier saddle 31 is at the same level as the road surface 3 when the pier saddle 31 is fixed.
[0022]
FIG. 6 is a diagram illustrating a process of arranging the central beam 7 on the pier 27. After the installation of the pier saddle 31, the central girder 7 is moved above the pier 27 using the movable gantry 11, and the state shown in FIG. 6 is obtained. As described above, at the time of movement, the movable base 11 is pulled by a tire shovel or winch (not shown) while injecting a working medium into the water caster 13.
[0023]
FIG. 7 shows a schematic diagram of a cross section of the movable mount 11 during movement. The movable gantry 11 includes a gantry 12 and a water caster 13. The water caster 13 includes a main body 37 having a working medium injection pipe 45 and a plurality of caster backs 41 provided at the lower portion of the main body 37. The caster bag 41 has a working medium inlet 39 from the main body 37 and an opening 43.
[0024]
When water is injected into the injection tube 45 of the main body 37 as shown by the arrow B, the caster back 41 expands with water. At the same time, water flows out from the opening 43 of the caster back 41 as shown by the arrow C, and the pressure chamber 35 between the adjacent caster backs 41 is filled with water. When the water pressure in the pressure chamber 35 reaches a state where the load of the movable frame 11 and the central beam 7 can be lifted, water escapes evenly between the road surface 1 and the caster back 41 as indicated by an arrow D. The mobile gantry 11 is in a state of floating from the road surface 1. The movable gantry 11 is pulled in a state where a space of about 22 mm or more is secured between the road surface 1 and the caster back 41.
[0025]
At this time, for example, when the weight of the central girder 7 is 1200 t and the weight of the movable mount 11 is 100 t, the installation pressure at the time of movement is about 5 t / m ² . In this way, when the girder is moved by the movable gantry 11 having the water casters 13, the load can be dispersed and the road surface 3 need not be specially cured.
[0026]
When the movable frame 11 is disposed between the foundation holes 15 in which the pier 27 is built and constructed, and the water injection to the main body 37 is stopped, the caster back 41 is grounded to the road surface 1.
[0027]
FIG. 8 is a cross-sectional view of the pier 27 in a state where the central girder 7 is temporarily placed on the pier saddle portion 31, and FIG. 9 is a diagram illustrating a process of raising the central girder 7 to a normal installation height. After the central girder 7 is arranged above the pier saddle portion 31 shown in FIG. 5, the peer suspension rod 23 is raised using the lifting jack 25, and as shown in FIG. 8, the central girder 7 is placed on the upper end of the pier saddle portion 31. Is temporarily placed. And as shown in FIG. 9, the peer suspension rod 23 is further raised until the center part girder 7 mounted on the peer saddle part 31 reaches a regular installation height.
[0028]
After the transfer of the load of the central girder 7 from the movable gantry 11 to the pier 27 is completed, the movable gantry 11 is moved to the planned installation position of the ramp portion girder 9a.
[0029]
FIG. 10 is a diagram illustrating a process of forming the ramp portion beam 9 a on the movable mount 11. As shown in FIG. 10, the slanting portion girder 9 a is formed on the movable frame 11 in a state where the central girder 7 is held at a regular installation height and traffic in the direction of arrow E is secured. After completion of the ramp part girder 9 a, the pier suspension rod 23 is lowered using the lifting jack 25, and the pier 27 is suspended again inside the foundation hole 15.
[0030]
FIG. 11 is a sectional elevational view of a state in which the pier 27 is suspended in the foundation hole 15. As shown in FIG. 11, the pier 27 and the pier saddle portion 31 are arranged inside the foundation hole 15, and the central beam 7 is placed on the pier saddle 31 fixed to the pier 27. Even in the foundation hole 15 in which the pier 33 is built and constructed, the pier 33 and the pier saddle portion 31 are arranged inside the foundation hole 15.
[0031]
After the central beam 7 is lowered to the position shown in FIG. 11, the position of the ramp portion beam 9 a is adjusted using the movable frame 11. As shown in FIG. 11, the ramp portion girder 9 a is disposed above the pier saddle portion 31 of the pier 27 and the pier saddle portion 31 of the pier 33.
[0032]
FIG. 12 is a diagram showing a process of raising the central part girder 7 and the ramp part girder 9a. From the state shown in FIG. 11, the pier suspension rod 23 is lifted using the lifting jack 25 to raise the pier 27 and the pier 33 in the manner shown in FIG. 8. After the load of the ramp part girder 9a is received from the movable gantry 11 to the pier 27 and the pier 33, the pier 27 and the pier 33 are further raised to predetermined positions, respectively, and the central part girder 7 and the ramp part girder 9a are installed. .
[0033]
The ramp portion girder 9b is formed in parallel with the ramp portion girder 9a on the road surface 3 at a planned installation position using another fixed frame or the like, and is installed simultaneously with the central portion girder 7 and the ramp portion girder 9a. . The other parts of the three-dimensional intersection road 1 are constructed in parallel with the production and construction of the ramp part girders 9a, 9b and the central part girder 7.
[0034]
The movable gantry 11 and the fixed gantry used for the production of the ramp portion girder 9b are removed at an appropriate time. Moreover, after installing the pier 27 and the pier 33 on the road surface 3, concrete is placed in the foundation hole 15. In addition, the support bracket 21, the peer suspension rod 23, and the like are removed as appropriate. Finally, bridge work and finishing work are performed to complete the three-dimensional intersection road 1.
[0035]
Thus, in the present embodiment, the central girder 7 is formed on the movable gantry 11 while the pier 27 and the pier 33 are built and constructed inside the foundation hole 15. The construction period can be shortened by carrying out construction of the foundation and piers and girder production at the same time.
[0036]
Moreover, after moving the center part girder 7 upwards of the pier 27 using the movable stand 11, the pier 27 stood in the inside of the foundation hole 15 is lifted using the raising / lowering jack 25. FIG. And the ramp part girder 9a is formed in the state which temporarily installed the center part girder 7 on the pier 27. FIG. The bridge pier 27 and the pier 33 can be repeatedly raised and lowered, and the central girder 7 formed in the work yard is temporarily placed on the raised pier 27, so that the period of time during which the central girder 7 is closed is greatly reduced. it can.
[0037]
In this embodiment, the pier 27 and the pier 33 are constructed in parallel with the central girder 7. However, the construction time of the pier 33 is not limited thereto, and the central girder 7 and the ramp girder 9a, 9b are constructed. The construction should be completed by Moreover, the arrangement position of the movable frame 11 when forming the central part girder 7 and the ramp part girder 9a is not limited to the road surface 3 of the planned position of the ramp part girder 9a. The number of members such as girders and bridge piers constituting the three-dimensional intersection road 1 is not limited to that shown in FIG.
Further, an air caster may be used in place of the water caster 13 of the movable mount 11. In this case, gas is used instead of water as the working medium.
[0038]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a three-dimensional intersection construction method, a three-dimensional intersection, and a pier structure that can shorten the work period by simultaneously performing foundation work and girder production.
[Brief description of the drawings]
FIG. 1 is an elevation view of a three-dimensional crossing road. FIG. 2 is a diagram showing a process of forming a central girder 7 on a moving gantry. FIG. 3 is a sectional elevation view of a foundation hole. Fig. 5 is a sectional view of the pier 27 with the pier saddle portion 31 installed. Fig. 6 is a diagram showing a process of placing the central beam 7 on the pier 27. FIG. 8 is a cross-sectional view of the pier 27 with the central girder 7 temporarily placed on the pier saddle portion 31. FIG. 9 is a step of raising the central girder 7 to a normal installation height. FIG. 10 is a diagram showing a process of forming a ramp portion girder 9a on the movable gantry 11. FIG. 11 is a sectional elevation view of a state in which a pier 27 is suspended in the foundation hole 15. FIG. The figure which shows the process of raising the girder 7 and the ramp part girder 9a
1 ......... Crossover road 7 ......... Center part girder 9a, 9b ......... Ramp part girder 11 ......... Moving frame 13 ......... Water caster 15 ......... Base hole 19 ......... Support frame 21 ... ... Support bracket 23 ... Peer hanging rod 25 ... Elevating jacks 27, 33 ... ... Pier 29 ... ... Peer connection frame

Claims (4)

A step (a) of producing a girder on a movable frame;
Supporting means provided at the opening of the base hole in the base hole, lifting means fixed to the supporting means, and a hanging jig held by the lifting means and suspended in the base hole The pier is built in the foundation hole by constructing the pier for each lot in order from the bottom on the suspension jig while lowering the suspension jig using the lifting means every time one lot is constructed. Including step (b),
A step (c) of moving the movable gantry and placing the beam above the pier;
Elevating the pier from the foundation hole and supporting the beam with the pier (d);
A three-dimensional intersection construction method characterized by comprising:   The three-dimensional intersection construction method according to claim 1, further comprising a step (e) of placing concrete in the foundation hole after the step (d). 2. The three-dimensional intersection construction method according to claim 1, wherein the step (d) raises the hanging jig by the lifting means .   A three-dimensional intersection constructed by the three-dimensional intersection construction method according to any one of claims 1 to 3.

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