JP2003293320A - Erection device of diagonal member in composite truss bridge and erection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an erection device of a diagonal member in a comparatively simple composite truss bridge increasing execution accuracy and, at the same time, to provide an erection method of the diagonal member in the composite truss bridge capable of easily erecting at low cost with high degree of accuracy by using an execution device thereof. <P>SOLUTION: The erection device of the diagonal member in the composite truss bridge providing a jig for holding the diagonal 11 to the up and down holding beams 2 and 4 is so constituted that the basic end section of the lower holding beam 2 projecting the front end to a new established side is fixed to the upper surface of the existing lower slab 1 and that the basic section of the upper holding beam 4 projecting the front end to the established side is fixed to the lower surface of the existing upper slab 3. The jig 6 holding the diagonal member 11 is equipped with a holding position adjusting device 7 for adjusting a holding position of the diagonal member 11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for constructing diagonal members when constructing a bridge such as a truss bridge or other composite truss bridge.

[0002]

2. Description of the Related Art Conventionally, when a diagonal truss is sequentially provided from a pillar head in the axial direction of the bridge, and a lower floor slab and an upper floor slab are connected to the diagonal timber to construct a composite truss bridge, Regarding the method of installing the diagonal members of the truss bridge (excluding the diagonal members in the case of cast-in-place concrete), as shown in Figs. 13 and 14, the wagon (for moving work) installed on the pillar head or on the existing upper deck 3 Although the upper and lower ends of the diagonal member 11 are suspended and held by the trolley 10, this method has a problem that construction errors are likely to occur, and the wagon 10 supports both ends of the diagonal member 11. Since it is a form which carries out, the whole load of diagonal member 11 will be supported, and there is a problem that Wagen 10 will become large.

In addition, when building a diagonal member in a truss bridge, the diagonal members were fixed by using beams made of trusses, but with this method, the erection material becomes large and construction errors tend to occur. There is.

In the above-mentioned conventional erection methods, a construction error is likely to occur, the wagon becomes large, and in the case of (1), the erection material becomes large-scaled, and in both cases, the construction cost is high.

In view of the above-mentioned conventional drawbacks, the present inventor has conducted research to eliminate these drawbacks. As a result, one or both of the existing concrete floor slabs with beams are fitted with beams and the beams are If at least one end in the vertical direction is fixed with a jig, the construction error of the diagonal members will not occur easily, the beam will be lighter, and if necessary, the beam will be shared with the formwork receiving beam of the floor slab. It will be possible to do it, and the construction cost will be low. And it is possible to use not only concrete truss materials but also steel truss materials and other diagonal materials. Also, in the conventional construction method, construction joints were made near the grade points, but by further extending the floor slab construction section, it is possible to make the above-mentioned beam simpler, etc. Thus, the present invention was completed.

[0006]

SUMMARY OF THE INVENTION The present invention provides a relatively simple erection device for a diagonal truss in a composite truss bridge with improved construction accuracy, and the construction device is used to easily and accurately measure the diagonal member. An object of the present invention is to provide a method of erection of diagonal members in a composite truss bridge that can be erected well at low cost.

[0007]

In order to solve the above-mentioned problems, in the erection device for diagonal members in the composite truss bridge according to claim 1, either the upper surface of the existing lower floor slab or the lower surface of the existing upper floor slab is used. On one of the floor slabs, the base end of the receiving beam arranged so that the tip portion projects toward the new side is fixed, and a jig for holding the diagonal member is provided on the receiving beam. It is characterized in that one end is held and the other end of the diagonal member is suspended and supported by a wagon.

Further, in the device for constructing the diagonal members in the composite truss bridge according to the second aspect, the lower receiving beam 2 is arranged on the upper surface of the existing lower floor slab 1 so that the tip portion thereof projects to the new side. The base end portion is fixed, and the base end portion of the upper receiving beam 4 arranged so that the tip end portion projects toward the new side is fixed to the lower surface of the existing upper floor slab 3, and the upper and lower receiving beams 2 and 4 are respectively fixed. Diagonal material 11
It is characterized in that a jig 6 for holding is provided.

Further, in the invention described in claim 3, in the invention described in claim 1, the jig 6 for holding the diagonal member 11 is provided with a holding position adjustment for adjusting the holding position of the diagonal member 11. A device 7 is provided.

Furthermore, in the invention of claim 4,
In the invention according to any one of claims 1 to 3, an existing floor slab is constructed so as to project to the vicinity of a newly constructed rating part, and a base end portion is attached to the existing floor slab. It is characterized in that the overhang distance of the fixed receiving beam is shortened.

Further, in the method of erection of the diagonal members in the composite truss bridge according to the fifth aspect, the tip end is newly installed on the floor plate of either the upper surface of the existing lower floor slab or the lower surface of the existing upper floor slab. The base end portion of the receiving beam arranged so as to project to is fixed to the receiving beam, and a jig for holding the diagonal member is provided on the receiving beam. It is characterized in that the end side is suspended and supported by a wagon to hold the diagonal member at a predetermined position, and then a new lower floor slab or a new upper floor slab is provided so as to be coupled with the diagonal member.

Furthermore, in the method of erection of the diagonal members in the composite truss bridge according to claim 6, the lower receiving beams are arranged on both sides of the upper surface of the existing lower floor slab 1 so that the tips thereof project to the new side. While fixing the base end of 2, existing upper floor slab 3
The base end portions of the upper receiving beams 4 arranged so that the tip portions thereof protrude toward the new side are fixed to both sides of the lower surface of the, and the diagonal members 11 are attached to the upper and lower receiving beams 2 and 4 of the respective side portions. The jigs 6 for holding are provided respectively, and after the diagonal members 11 are held by the jigs 6 on the upper and lower sides of each side, a new lower floor slab or a new upper floor slab is attached to the diagonal member 1.
It is characterized in that it is provided so as to be coupled with 1.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of an apparatus and method for installing a diagonal member in a composite truss bridge according to the present invention will be described with reference to FIGS.

1 to 7 show a first embodiment of an apparatus for constructing a diagonal member in a composite truss bridge of the present invention. First, the state of FIG. 1 is sequentially constructed from a column head (not shown). It is a side view which shows the state just before constructing the new lower floor slab 1a by the wagon (working trolley) 10 which can be moved on the bridge which consists of the existing overhang compound truss bridge 9. In this embodiment, an existing overhanging composite truss bridge 9 includes a reinforced concrete lower floor slab 1, a prestressed concrete upper floor slab 3 and a diagonal member 1 connected to these.
It is a part that was built so as to project in sequence by 1.

The general construction procedure up to the state shown in FIG. 1 is as follows (1) to (2). (1) A truss is assembled on the upper part of a column head (not shown), and in order to build a lower floor slab and an upper floor slab as a starting point, concrete is respectively cast to build a lower floor slab and an upper floor slab as a starting point, The lower floor slab is an existing lower floor slab 1, and the upper floor slab is an existing upper floor slab 3. (2) Build a wagon. (3) When the construction of the upper part of the stilt head is completed, set the lower receiving beam 2 for receiving the diagonal member 11 on the existing lower floor slab 1 at a predetermined position, and attach it to the existing lower floor slab 1 from the PC steel bar. Secure it with one or more anchor bolts 12 at one place. Further, the upper receiving beam 4 for receiving the diagonal member 11 is held on the lower surface of the existing upper floor slab 3 and is fixed to the existing upper floor slab 3 by using the anchor bolts 14 made of PC steel rods as described above. Hereinafter, the steps of sequentially holding the diagonal members 11 and constructing the new lower floor slab 1a and the new floor slab 3a are repeated, but FIG. 1 (also in FIG. 2) shows that the diagonal members 11 FIG. 3 is an explanatory view for constructing and joining a new lower floor slab 1 a in the lower part of FIG.

More specifically, the upper surface of the existing reinforced concrete lower floor slab 1 of the existing composite truss bridge A constructed so as to project from the pillar head (not shown) is shown in FIGS. As shown in a), a plurality of steel slide support plates 8 are placed on both sides in the direction perpendicular to the bridge axis (front-rear direction) at intervals in the left-right direction (bridge axis direction),
The bottom end of each lower receiving beam 2 is fixed to the lower slab 1 made of reinforced concrete via the steel slide supporting plate 8 and is fixed to one or a plurality of anchor bolts 12 at intervals in the left-right direction. It is fixed by. The channel steels 17 inside each of the lower receiving beams 2 facing each other in parallel with the front-rear direction at intervals have the ends of the connecting beams 2a arranged so as to extend in the front-rear direction at intervals in the left-right direction. They are integrated by being joined by welding or the like. Further, the outer channel steel 17 is
It is integrated by a steel connecting plate 2b fixed to the inner channel steel 17 by welding or the like.

The tip end portion of the lower receiving beam 2 is arranged so as to project (cantilever) toward the new side by a size larger than the size of the lower rating portion K to be constructed next. The lower end of the anchor bolt 12 is inserted into the lower floor slab 1 and engages with the lower surface of the lower floor slab 1, and the bearing plate and the nut 12a inserted into the anchor bolt 12 are screwed together to form a lower portion. Floor slab 1
(The engagement of the upper portion of the anchor bolt 12 will be described later). Further, the tip end portion of the lower receiving beam 2 is supported by a hanging support metal fitting 36 whose one end (upper portion) is suspended and supported by the wagon 10 so that the level can be adjusted. In addition, the rear end of the wagon 10 is constructed so that a detachable anchor member 46 exerts a reaction force on the existing upper floor slab 3 and is supported at a predetermined position by a supporting member (not shown) such as a jack. Has been done.

As shown in FIGS. 5 (a) and 12, the lower receiving beam 2 has a pair of channel steels 17 and a web portion 17a.
Are arranged so as to be back-to-back with each other in parallel with each other, and an intermediate shaft portion of the anchor bolt 12 is arranged between the webs 17a thereof, and a pressing member having a groove-shaped cross section is attached to the upper flanges 15 of the pair of groove-shaped steels 17. 16 is fitted and abutted, and a nut 17b is screwed and tightened to the upper male screw portion 12a of the anchor bolt 12 inserted into the bolt hole of the holding metal fitting 16, and the base of the lower receiving beam 2 is inserted via the holding metal fitting 16. The ends are fixed to the existing lower floor slab 1. The space between the webs 17a is configured so as not to interfere with the anchor bolt 12 when the lower receiving beam 2 slides (the same applies to the upper receiving beam 4 and the anchor bolt 14 described later). ).

On the lower surface of the existing prestressed concrete floor slab 3 of the existing composite truss bridge A,
As shown in FIG. 5 (b), steel support plates 13 are arranged and fixed on both sides in the direction perpendicular to the bridge axis (front-rear direction) so as to extend in the left-right direction. The base end portion of each upper receiving beam 4 is fixed to the prestressed concrete upper floor slab 3 by one or a plurality of anchor bolts 14 at intervals in the left-right direction. The tip end portion of the upper receiving beam 4 is arranged (cantilever type) so as to project to the new side by a size equal to or larger than the dimension of the upper graded portion K to be constructed next. The upper end portion of the anchor bolt 14 engages with the upper surface of the upper floor slab 3 and is locked to the upper floor slab 3 by a bearing plate and a nut 17b inserted in the anchor bolt 14. Further, as shown in FIG. 12A, the channel steels 17 inside the upper receiving beams 4 facing each other in parallel with each other in the front-rear direction at intervals are extended in the front-rear direction at intervals in the left-right direction. The ends of the connecting beams 4a thus arranged are joined and integrated. The outer grooved steel 17 is integrated with the inner grooved steel 17 by a steel connecting plate 4b fixed by welding or the like.

The tip end of the upper receiving beam 4 is supported by a hanging support metal fitting 37, one end of which is suspended and supported by the wagon 10, so that its level can be adjusted. As shown in FIG. 5C, the lower end portions of the hanging metal fittings 36 and 37 are provided with screw rods 36 a and 3 of the hanging metal fittings 36 and 37.
7a is arranged between the webs 17a, and is a pressing member 16 having a groove-shaped cross section fitted to the lower portion of each groove-shaped steel 17.
And is supported at a predetermined level by nuts 36c and 37c screwed to the screw rods 36a and 37a.

Further, similarly to the above, as shown in FIG. 12, the upper receiving beam 4 is provided with a pair of channel steels 17 and a web portion 17a.
Are arranged parallel to each other with a space therebetween so as to be back-to-back, and intermediate shaft portions of a plurality of anchor bolts 14 are arranged between the webs 17a with a space therebetween in the left-right direction. The pressing metal fitting 16 is brought into contact with the above and is tightened by the nut 14b screwed to the lower male screw portion 14a of the anchor bolt 14, and the base end portion of the upper receiving beam 4 is attached to the upper floor slab 3 via the pressing metal fitting 16. It is fixed. As described above, since the lower receiving beam 2 and the upper receiving beam 4 are not entirely supported by the wagon 10, the base end portions of the existing floor slabs 1 and 3 are fixed and only the front end portions thereof are supported. The load on the wagon 10 is reduced, and the size of the wagon 10 can be reduced.

On the upper portion of the lower receiving beam 2 and the lower portion of the upper receiving beam 4, a jig 6 for adjusting the position of the diagonal member 11 and holding the diagonal member 11 at a position close to the grading portion K to be built next.
Are fixed to the flange 15 by bolts and nuts and are arranged at intervals in the bridge axial direction. Since the positions of the rating portions K of the truss are at regular intervals, the jigs 6 need not be adjusted in the bridge axis direction.

In the present embodiment, the jig 6 supports the diagonal member 11 in a state in which it is held in a predetermined posture. Therefore, when the jig 6 is held at a position apart from the graded portion K in the bridge axis direction and close to it. The diagonal member 11 can be supported in a stable state. The end portion of the diagonal member 11 is held by the jig 6 at a position where this portion is removed in order to integrate it with the newly installed upper floor slab 3a or lower floor slab 1a.

Next, the jigs 6 will be described with reference to FIGS. 6 and 7. Each jig 6 includes a steel pedestal 19 having a vertical female screw hole 18a and a vertical position adjusting jack 20. Via a steel holding member 21 which is vertically movably supported by a holding member 21 and a steel pipe diagonal member 11 supported by the holding member 21 through a tilt adjusting device 22 and a lateral position adjusting device 23. The holding position adjusting device 7 including the portion 24 is provided. The structure of each part will be described below.

In this embodiment, the holding member 21 is provided with a vertical vertical female screw hole 18b opening on its lower surface, and the female screw hole 18a of the pedestal 19 and the female screw hole 18b of the holding member 21 are screwed in the screw direction. Female screw holes of different 18
a and 18b, and screw rods 18c and 18d having different screw directions are screwed to both ends thereof, and the screw rod 1
A vertical handle 29 is fixed to the central portions of 8c and 18d to form a vertical position adjustment jack 20 capable of adjusting the position of the holding member 21 in the vertical direction. Further, a vertical guide rod 40 having a lower end fixed to the pedestal 19 is fixed to the pedestal 19, and a receiving metal fitting 41 slidably inserted in the guide rod 40 is attached to the holding member 21. The holding member 21 is fixed by welding or the like so that the holding member 21 is vertically movable and non-rotatable.

Inside the front side of the holding member 21 in the front-rear direction, a groove 27 having upper and lower bearing surfaces 26 each having an arcuate cross section is formed.
The female screw member 28 is rotatably supported in the groove 27 in a vertical plane perpendicular to the bridge axis, and the female screw member 28 has a lateral screw member extending in the front-rear direction. The base end of the screw rod 25 is screwed and connected. A turning handle 30 is fixed to an intermediate portion of the horizontal screw rod 25, and a base end portion of a diagonal member fixing metal member 32 including a diagonal member fixing band metal member 31 is rotated at a tip end portion of the horizontal screw rod 25. Supported as possible. Therefore, by rotating the rotating handle 30 forward or backward, the web fixing member 32 can be moved forward or backward.

Between the front side of the holding member 21 and the rotating handle 30, a female screw member which is engaged with the front side of the holding member 21 and which is a nut screwed to the horizontal screw rod 25 is formed. 21a is provided, and the female screw member 2
When 1 is rotated in the direction of approaching the rotation handle 30, the horizontal screw rod 25 holds the female screw member 28 screwed to the tip end of the horizontal screw rod 25 with the lower portion of the female screw member 21a abutting the holding member 21. It rotates in the counterclockwise direction (see FIG. 6), and by the rotation, it rotates in the counterclockwise downward direction and the level of the diagonal member 11 can be adjusted. The horizontal screw rod 25, the female screw member 21a, the groove 27 having upper and lower arcuate cross-section bearing surfaces 26, the female screw member 28, and the like constitute an inclination adjusting device 22, and the horizontal screw rod 25, the female screw member 28, and a turning handle. The lateral adjustment device 23 is configured by 30 and the like.

The center point of the arcuate bearing surface 26 is
The horizontal screw rod 25 is located on the central axis of the horizontal screw rod 25 and allows the horizontal screw rod 25 to slightly rotate, so that the outlet of the horizontal screw rod 25 of the holding member 21 is formed as a through hole having a slightly larger diameter. If the arcuate bearing surface 26 is a spherical bearing surface, it will move in the left-right direction, which is not preferable.

Further, in the locking groove 34 in the metal fitting body 33 at the base end portion of the web fixing metal fitting 32, the horizontal screw rod 2 is provided.
5 has a distal end portion rotatably fitted therein, and the left and right side portions of the metal fitting body 33 each have a steel band 3 for holding a diagonal member.
The base end of 5 is pivotally attached by the vertical axis, and the steel bands 3
5, a connecting flange 42 is provided at the tip end portion, and the connecting flanges 42 are tightened by bolts 43 and nuts screwed to the bolts 43 inserted through the lateral through holes to form a diagonal member. The intermediate portion from the end portion of the (steel pipe) 11 is configured to be gripped.

As described above, the diagonal member 1 is held at the position away from the end of the diagonal member 11 while being held by the jig 6.
The end portion of 1 is configured to be near the predetermined position of the mark portion.

A plurality of jigs 6 constructed in this way are provided in the left and right directions of the lower receiving beam 2 and the upper receiving beam 4 (in the case shown, the same applies to both front and rear sides, and two or three jigs are provided on the upper side).
One, two or three on the lower side) provided with an interval,
For example, as shown in FIG. 1, when the two diagonal members 11 are arranged in a substantially V shape, the jig 6 on the upper side has a wide space at a position close to the adjacent mark portions K. The jigs 6 that are arranged so as to hold the lower portion of the diagonal member 11 are arranged substantially symmetrically at positions close to the left and right sides of one grading portion K.

The diagonal member 11 is carried on the existing upper floor slab 3 and is hung by the electric chain block of the wagon 10, and attached to each jig 6. Further, the free end side of the diagonal member 11, which is fixed to the floor slab only at one end side, is held at a predetermined position by the jig 6. Then, as shown in FIG. 1, the jig 6 (6a) located on the existing side of the upper receiving beam 4 side and the jig 6 (6b) located on the existing side of the lower receiving beam 2 side The one diagonal member 11 (11a) positioned is held in a position adjusted state, and the upper receiving beam 4
Jig 6 (6c) located on the newly installed side and the lower receiving beam 2
By the jig 6 (6d) located on the newly installed side, the other diagonal member 11 (11b) located on the newly installed side is held with its position adjusted.

In order to build a new lower floor slab 1a with each diagonal member 11 supported as described above, the wagon 10
The lower metal mold 4 is supported by the support metal fittings 44 suspended from the
After suspending and supporting 3 at a predetermined position and arranging, concrete is poured to construct the new lower floor slab 1a so that the lower end portions of the diagonal members 11 are joined, and the mold is demolded. It Although not shown, the new lower floor slab 1a and the lower receiving beam 2 are provided with holding devices similar to the anchor bolts 12 and the holding members 16 provided on the existing side at intervals in the bridge axial direction. , Do not tighten. In addition, the diagonal member 11 (5)
Because of the connection between the end of the and the floor slab, at both ends of the diagonal member 11,
Although illustration is omitted, connecting rebars and the like for embedding and fixing in the floor slabs 1 and 3 are provided.

Next, in order to build a new upper floor slab 3, jigs 6 are fixed near the tips of the upper receiving beam 4 and the lower receiving beam 2, respectively, and a new diagonal member is added by each jig 6. 11 is supported at a predetermined position, and the upper form 45 is suspended and supported at a predetermined position. After arranging, concrete is poured to build a new upper floor slab 3a. Remove the mold. Further, although not shown, the new upper floor slab 3a and the upper receiving beam 4 are provided with holding devices similar to the anchor bolts 14 and the holding members 16 provided on the existing side at intervals in the bridge axial direction, Hold temporarily without tightening.

As described above, after the new lower floor slab 1a and the new upper floor slab 3a are built, rails are laid on the upper floor slab 3a, and the hanging support fittings 36, 37 are opened, and the wagon Move the 10 forward to the new side,
The rear part takes a reaction force by an anchor member 46 which is detachably locked to the upper floor slab 3.

After that, the nuts engaged with the anchor bolts 12 and 14 that lock the lower receiving beam 2 and the upper receiving beam 4 are loosened, and the nuts are attached to the lower receiving beam 2 and the upper receiving beam 4. With the gripping band 35 of the jig 6 released, the upper receiving beam 4 held by the new upper floor slab 3a is moved forward to the new side, and the nut engaged with the anchor bolt 14 is tightened. Then, the upper receiving beam 4 is fixed to the new upper floor slab 3a via the holding member 16. Similarly, the lower receiving beam 2 is moved forward to the new installation side, the nuts engaged with the anchor bolts 12 on the new installation side are tightened, and the lower receiving beam 2 is held on the new lower floor slab 1a.
It is fixed to the new lower floor slab 1a via. (See FIGS. 5a and 5b) The slide support plate 8 and the slide support plate 13 are
It is properly attached to the new lower floor slab 1a and upper floor slab 3a.

Next, as described above, the new diagonal member 11 or the like is conveyed over the existing upper floor slab 3 (3a), and the wagon 10 is removed.
It is hung by the electric chain block in and attached to each jig 6. Further, the free end side of the diagonal member 11 whose one end side is fixed to the floor slab is held at a predetermined position by the jig 6.

Thereafter, the same steps as described above are repeated to successively build the composite truss bridge A. The new floor slab 1a
Alternatively, when the 3a is built, each floor slab 1a, 3a is tensioned and fixed by a PC cable arranged inside or outside the slab.

The above steps will be briefly described below, although some overlaps will occur. (1) On the upper part of the pillar, a truss is assembled and concrete is placed on each of the lower slab and the upper slab. (2) Build a wagon. (3) When the construction of the upper part of the stilt head is completed, set the lower receiving beam 2 for receiving the diagonal member 11 on the existing lower floor slab 1 at a predetermined position, and attach it to the existing lower floor slab 1 from the PC steel bar. Secure it with one or more anchor bolts 12 at one place. In addition, the upper receiving beam 4 for receiving the diagonal member 11 such as a diagonal member is held on the lower surface of the existing upper slab 3, and the existing upper slab 3 is formed by using the anchor bolts 14 made of PC steel rods as described above. Fixed to. (4) Since the positions of the rating portions K of the truss are determined at regular intervals in the bridge axis direction, the mounting jigs 6 for receiving the diagonal members 11 on the lower receiving beams 2 and the upper receiving beams 4 near that position are provided. Install. Since the interval between the graded portions K is fixed, adjustment of the jig 6 in the bridge axis direction is unnecessary. Horizontal position adjusting device such as a horizontal position adjusting jack for the direction perpendicular to the bridge axis 2
3, the vertical position adjusting jack 20 and the inclination adjusting device 22 are attached to the jig 6. A diagonal member fixing metal fitting 32 made of a diagonal metal fitting band metal fitting 31 for gripping the diagonal material 11 made of the diagonal material 11 is attached to the tip of the lateral position adjusting device 22. Since the upper and lower end portions of the diagonal member 11 are embedded in the upper and lower concrete floor slabs 1a and 3a, the gripping position should be a position away from the tip. Each jig 6 is supported on one diagonal member 11 at two places below and above. In this way diagonal 1
1 supports the diagonal member 11 around the axis of the horizontal screw rod 25.
Is held in place without turning.

(5) The diagonal member 11 is transported from the existing upper floor slab 1, suspended by the wagon 10, and attached to the diagonal member fixing band fitting 31. (6) The holding position adjusting device 7 including the lateral position adjusting device 23, the vertical position adjusting jack 20 and the inclination adjusting device 22 is used to adjust the horizontal and vertical directions to move the diagonal member 11 to a predetermined position and a predetermined position. It is held in a posture and fixed in a predetermined holding position. (7) Assemble the lower mold 43. (In this case, in this embodiment, the form in which the lower floor slab 1 is installed up to a position past the position of the grading point K is shown, but as described in the next embodiment, When the lower formwork 43 is assembled up to this side and concrete is placed, when the lower receiving beam 2 receives the load of the diagonal member 11 next time, the arm length protruding in a cantilever manner to the new side is short and advantageous. These points also apply to the upper mold 45, the upper floor slab 3, and the upper receiving beam 4.)

(8) Assemble the lower floor slabs. (9) Pour the concrete of the lower floor slab, remove the mold after curing. (10) Next, the diagonal member 11 to be attached to the upper rating portion K is attached, and the posture and position of the diagonal member 11 are adjusted. (11) After that, the upper form 45 is assembled, the upper floor slabs are assembled, concrete is poured, and after hardening, the mold is removed. (12) By laying rails on the upper floor slab 3 and wagon 1
0 is advanced to a predetermined position. (13) Instead of the jig 6 that holds the diagonal member 11 at the tip on the new side in the bridge axis direction, the tip portion of the diagonal member 11 that is not fixed to the floor slab is suspended and supported from the wagon 10. The wagon 10 is held by appropriate holding means, and the diagonal member fixing metal fitting 32 (the diagonal material fixing band metal fitting 3) of the other jig 6 is held.
1) is opened, the nuts of the anchor bolts 12 and 14 are loosened to advance the lower receiving beam 2 and the upper receiving beam 4, and then the lower receiving beam 2 and the upper receiving beam 4 are attached to each new floor slab 1a, 3a. To fix. (14) Returning to (5), the steps from (6) are sequentially repeated.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, when constructing the new floor slabs 1a and 3a, it is better to assemble the formwork up to the position of the new grade part to be built next and place the concrete next to the receiving beam. Forward 2 and 4 to receive beam 2,
When the load of the diagonal member 11 is received by 4, the overhang arm length of the receiving beams 2 and 4 is shortened, which is advantageous. Therefore, the tip portions of the existing floor slabs 1 and 3 are also built up to the point before the rating portion K.

In this way, the existing floor slabs 1 and 3 (or the new floor slabs 1a and 3a) are constructed so as to project to the vicinity of the newly constructed graded portion K, and the existing floor slabs are installed. When the projecting distance of the receiving beams 2 and 4 whose base ends are fixed to the floor slab 1 is short, the load of the diagonal member 11 and the bending moment by the receiving beams 2 and 4 are small, The burden on the wagon 10 via the suspension support fittings 36, 37 is also reduced, and the construction accuracy is improved. Moreover, since the overhang distance of the receiving beams 2 and 4 becomes short,
The load on the receiving beams 2 and 4 can be reduced, and the weight of the receiving beams 2 and 4 can be reduced. Since other configurations are the same as those of the above-described embodiment, the same reference numerals are given to the same elements and the description thereof will be omitted.

In each of the above embodiments, the upper receiving beam 4 may support a part of the upper mold 45, or the lower receiving beam 2 may support a part of the lower mold 43. You may

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is an explanatory diagram for explaining the erection device and the erection method of the diagonal member in the composite truss bridge, and the upper receiving beam 4 fixed to the existing upper floor slab and having its tip end supported by the wagon, and the upper receiving beam 4 attached thereto. The jig 6 held by the jig 6 holds the upper portion of the diagonal member, and the lower portions of the diagonal member 11 are connected to each other by the connecting clamp 48, the connecting tie rod 56, and the like, immediately before the construction of the new upper floor slab 3a. FIG.

In this embodiment, a receiving beam (2, 4) is provided on one of the upper and lower floor slabs 1 and 3, and one end of the diagonal member 11 is held by the receiving beam. Diagonal material 1
1 is an embodiment for explaining that the erection accuracy of No. 1 is improved and the burden on the wagon 10 is lightened.
In the case of 0, on the upper floor slab 3 side, the upper portion of the diagonal member 11 is held at a predetermined position by the upper receiving beam 4 and the jig 6 fixed to the upper receiving beam 4 as in the above embodiments. The jig 6 holds the entire load of the diagonal member 11.

Further, as shown in an enlarged manner in FIG. 11, a connecting and sandwiching metal fitting 48, which is grasped so as to be wrapped from the outside of the diagonal member 11, is fixed to the lower portion of each diagonal member 11. The connecting and sandwiching metal fitting 48 is arranged so as to sandwich a pair of gripping pieces 50, to which the base end portion of a bracket 49 having a lateral hole at the tip end portion is fixed, from both sides of the diagonal member 11 in the bridge axis direction, and each of the facing opposing pieces. Through holes for bolt insertion, which are provided at intervals in the up-down direction, are provided on the side portions of the gripping pieces 50 in the direction perpendicular to the bridge axis.
The diagonal member 11 can be firmly clamped by tightening the plurality of bolts 51 inserted through the zero bolt insertion holes and the nuts 52 screwed into the bolts 51.

An end of a steel support plate 54 having a support shaft 53 is fixed by welding across the intermediate portion of each bolt 51, and one end side of the wagon 10 is attached to the support shaft 53 by a nut or the like. The lower parts of the steel support fittings 54 that are locked and suspended and supported are connected to support the lower part of the diagonal member 11 at a predetermined position.

Further, the brackets 49 of the connecting and sandwiching metal fittings 48 fixed to the diagonal members 11 which are adjacent to each other or are spaced apart in the axial direction of the bridge are directly connected to each other by the horizontal pins 55 such as bolts. With the spacing device 58 configured by connecting the brackets 49 of the sandwiching fittings 48 adjacent to each other at intervals in the bridge axis direction via the short or long steel tie rods 56 and the horizontal pins 57 such as bolts, The diagonal members 11 on the new side that are close to or spaced apart from each other in the bridge axis direction are kept at a predetermined distance in the bridge axis direction.

As a modification of this embodiment, the diagonal member 11
The upper and lower support forms are reversed, that is, the lower receiving beams 2 are used on the lower floor slab 1 side, the lower part of the diagonal member 11 is supported by the jig 6, and the upper side is connected by the connecting clamp 48 and steel. A tie rod 56 may be used to support the upper portion of the diagonal member 11 by a support fitting 54 that is suspended and supported from the wagon 10. In these configurations, the upper and lower ends of the newly installed diagonal member 11 embedded and fixed in the rating portion K of the newly installed upper floor slab 3a or lower floor slab 1a are connected via the jig 6 to the receiving beam (2, 4) side. The other end of the newly installed diagonal member 11 is held at a predetermined position in the bridge axial direction by a spacing device 58 connected to the existing diagonal member 11 with the position of the existing diagonal member 11 as a reference. Diagonal member 1 held by the spacing device 58
In the direction perpendicular to the bridge axis of No. 1, it may be held by an appropriate means, but it is held by the spacing device 58 and the support fitting 56, and one end of the new diagonal member 11 is supported by the jig 6. Therefore, the position of the other end of the newly installed diagonal member 11 in the direction perpendicular to the bridge axis is also determined. In this way, while holding one end of the diagonal member 11 using the jig 6 fixed to the receiving beam (2, 4) fixed to one of the existing lower floor slab 1 or upper floor slab 3, Even if the other end of the diagonal member 11 is suspended and supported by the wagon 10, it is relatively accurate.
It can be constructed efficiently and the burden on the wagon can be reduced.

In each of the above-mentioned embodiments, the case of the diagonal truss made of steel pipe as the diagonal is shown. However, when the present invention is carried out, the diagonal may be a prestressed concrete diagonal truss, a corrugated steel plate or a FRP. It may be made of a plate. In the case of holding a plate-shaped diagonal member, the plate-shaped diagonal member 11 is provided with a supporting portion such as a plurality of female screw holes for bolt screwing, and instead of the grip band 35, an appropriate bolt insertion hole is provided. It may be dealt with by the diagonal member fixing bracket 32 having.

In the above embodiment, the holding position adjusting device 7 such as a screw type jack is used. However, when the present invention is embodied, the holding position adjusting device 7 may be a hydraulic jack or any other suitable device. May be used as the holding position adjusting device.

[0053]

According to the invention of claim 1, on either one of the upper surface of the existing lower floor slab or the lower surface of the existing upper floor slab,
The base end of the receiving beam arranged so that the tip portion projects toward the new side is fixed, a jig for holding the diagonal member is provided on the receiving beam, and one end side of the diagonal member is held by the jig. Since the other end of the diagonal member is suspended and supported by the wagon, the diagonal member erection device in a relatively simple composite truss bridge is used to securely hold the diagonal member, resulting in construction errors. It can be fixed to the floor slab with good construction accuracy so that there is no
Further, since the one end side of the receiving beam is fixed to the floor slab, the receiving beam can be made lightweight, the load burden on the wagon can be made relatively small, and the wagon can be made small. The construction cost can be reduced.

According to the second aspect of the present invention, the base end portion of the lower receiving beam arranged so that the tip portion thereof projects toward the new side is fixed to the upper surface of the existing lower floor slab, and the lower end of the existing upper floor slab is Since the base end of the upper receiving beam, which is arranged so that its tip projects toward the new side, is fixed, and a jig for holding diagonal members is provided on each of the upper and lower receiving beams, a relatively simple composite truss bridge The sloping material erection device can be used to securely hold the sloping material and fix it to the floor slab with good construction accuracy to prevent construction errors. Since the fixing beam is fixed, the receiving beam can be made light in weight, the load on the wagon can be reduced, the wage can be made small, and the construction cost can be reduced.

Further, not only concrete truss members but also steel truss members and other diagonal members can be dealt with by simply replacing the diagonal member fixing fittings at the tip of the jig.

When the jig for holding the diagonal member is provided with a holding position adjusting device for adjusting the holding position of the diagonal member, the posture and position of the diagonal member can be finely adjusted. It can be adjusted and held, and the diagonal member can be held accurately.

According to the invention of claim 4, the existing floor slab is
When the projecting beam of the receiving beam, which is constructed so as to project to the vicinity of the newly constructed rating part, and whose base end is fixed to the existing floor slab, is short, Further, the weight can be reduced, the burden on the wagon can be reduced, and the wagon can be downsized.

According to the fifth aspect of the present invention, the base end of the receiving beam is arranged on one of the upper surface of the existing lower floor slab and the lower surface of the existing upper floor slab so that the tip portion thereof projects toward the new side. A jig for holding the diagonal member is provided on the receiving beam, and one end side of the diagonal member is held by the jig, and the other end side of the diagonal member is suspended and supported by the wagon to support the diagonal member. After holding it in place, a new lower floor slab or new upper floor slab is installed so as to be connected to the diagonal member.Therefore, use a relatively simple erection device that uses a receiving beam equipped with a jig. Thus, the diagonal member can be easily held in a predetermined posture and position and connected to the upper floor plate or the lower floor plate. In addition, a simple construction method can be provided as a method of erection of diagonal members in a composite truss bridge, and the construction cost can be reduced.

According to the sixth aspect of the present invention, the base end portions of the respective lower receiving beams arranged so that the tips thereof project to the new side are fixed to both sides of the upper surface of the existing lower floor slab, and the existing upper floor slab is also fixed. Fix the base end of each upper receiving beam arranged so that the tip projects to the new side on both sides of the lower surface of the, and hold jigs on the upper and lower receiving beams of each side. Provided respectively, after holding the diagonal members on the upper and lower jigs on each side, the new lower floor slab or upper floor slab is provided so as to be coupled with the diagonal members,
By using a relatively simple erection device using a receiving beam provided with a jig, the diagonal member can be easily held in a predetermined posture and position and can be coupled to the upper floor plate or the lower floor plate. In addition, a simple construction method can be provided as a method of erection of diagonal members in a composite truss bridge, and the construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining an apparatus and method for erection of diagonal members in a composite truss bridge of the present invention, which is a lower receiving beam and an upper portion which are fixed to an existing floor slab and whose front end is supported by a wagon. FIG. 3 is a schematic side view showing a state immediately before a new lower floor slab is built in a state in which a diagonal member is held by a receiving beam and a jig attached thereto.

FIG. 2 is an explanatory view similar to FIG. 1, and is a schematic side view illustrating a state immediately before a new upper floor slab is built.

FIG. 3 is a partially longitudinal front view showing a relationship between each receiving beam, a diagonal member made of a jig and a diagonal member, and each floor slab.

FIG. 4 is a diagram showing a part of FIG. 3 in an enlarged manner.

FIG. 5 is a diagram showing the relationship between the receiving beam and the floor slab,
(A) is a front view showing a mounting structure of a lower receiving beam and a lower floor slab, (b) is a front view showing a mounting structure of an upper receiving beam and an upper floor slab, (c) is a front end of each receiving beam It is a front view which shows the state supported by the hanging support metal fitting suspended and supported from the wagon.

FIG. 6 is a partial vertical sectional front view showing a jig for holding a diagonal member.

7 is a partial cross-sectional plan view of FIG.

FIG. 8 is an explanatory view for explaining an apparatus and method for erection of a diagonal member in a composite truss bridge according to another embodiment of the present invention, in which the tip portion is supported by a wagon while being fixed to an existing floor slab. FIG. 3 is a schematic side view illustrating a state immediately before a new lower deck slab is built with a lower support beam, an upper support beam, and jigs attached to the support members holding the diagonal members.

FIG. 9 is an explanatory view similar to FIG. 8, and is a schematic side view illustrating a state immediately before a new upper floor slab is built.

FIG. 10 is an explanatory diagram for explaining a device and method for erection of a diagonal member in the composite truss bridge of the present invention, including an upper receiving beam fixed to an existing upper floor slab and having its tip end supported by a wagon, and these. While holding the upper part of the diagonal member by the jig attached to the lower part of the diagonal member, a schematic side view showing the state just before building a new upper floor slab with the lower parts of the diagonal member connected to each other by the connecting clamps and the connecting tie rods. Is.

FIG. 11 is a side view showing a part of FIG. 10 in an enlarged manner.

FIG. 12 (a) is a plan view showing the relationship between the upper receiving beam and the existing anchor bolts and hanging support fittings;
FIG. 7B is a plan view showing the relationship between the lower receiving beam, the anchor bolts on the existing side, and the hanging support fitting.

13A is an explanatory view of a conventional example, and FIG. 13B is a front view of a composite truss bridge.

FIG. 14 is an explanatory diagram of a conventional example.

[Explanation of symbols]

A existing compound truss bridge 1 Existing lower floor slab 2 Lower beam 3 Upper deck 4 Upper beam 6 jigs 7 Holding position adjustment device 8 Slide support plate 9 Existing overhang compound truss bridge 10 Wagen 11 diagonal materials 12 Anchor bolt 12a Upper male screw part 13 Support plate 14 Anchor bolt 15 Upper flange 16 Press fitting 17 Channel steel 17b nut 18a female screw hole 18b Female screw hole 19 Steel pedestal 20 Vertical position adjustment jack 21 Holding member 22 Tilt adjusting device 23 Lateral position adjustment device 24 Web fixing part 25 horizontal screw rod 26 Circular bearing surface 27 grooves 28 Female thread member 29 Rotating handle 30 Rotating handle 31 Band member for fixing diagonal members 32 Web fixing bracket 33 metal fittings body 34 Locking groove 35 gripping band 36 Hanging support bracket 37 Hanging support bracket 40 Guide rod 41 bracket 42 Connection flange 43 Lower formwork 44 Support bracket 45 Upper formwork 46 Anchor member 48 interlocking clamp 49 bracket 50 gripping pieces 51 bolts 52 Nut 53 spindle 54 Support bracket 55 horizontal pin 56 steel tie rod 57 Horizontal pin 58 Oblique material spacing device

Claims (6)

[Claims] 1. A base end portion of a receiving beam arranged so that a tip portion thereof projects toward a new side is fixed to either one of an upper surface of an existing lower floor slab or a lower surface of an existing upper floor slab, and A composite truss characterized in that a jig for holding the diagonal member is provided on the receiving beam, one end side of the diagonal member is held by the jig, and the other end side of the diagonal member is suspended and supported by a wagon. Construction equipment for diagonal members in bridges. 2. A base end portion of a lower receiving beam, which is arranged so that a tip portion thereof projects toward a new side, is fixed to an upper surface of an existing lower floor slab, and a tip portion is attached to a new side of a lower surface of the existing upper floor slab. An apparatus for constructing diagonal members in a composite truss bridge, characterized in that a base end portion of an upper receiving beam arranged so as to project is fixed, and a jig for holding the diagonal member is provided on each of the upper and lower receiving beams. 3. The composite truss bridge according to claim 1, wherein the jig for holding the diagonal member is provided with a holding position adjusting device for adjusting the holding position of the diagonal member. Erection equipment for diagonal members in Japan. 4. An overhang distance of the receiving beam, in which an existing floor slab is constructed so as to project to the vicinity of a newly constructed rating plate to be constructed next, and a base end portion of which is fixed to the existing floor slab. 4. The erection device for diagonal members in a composite truss bridge according to claim 1, wherein the bridge truss is shortened. 5. A base end portion of a receiving beam arranged such that a tip portion thereof projects toward a new side is fixed to one of the upper surface of the existing lower floor slab and the lower surface of the existing upper floor slab, and A jig for holding the diagonal member is provided on the receiving beam, one end side of the diagonal member is held by the jig, and the other end side of the diagonal member is suspended and supported by a wagon to hold the diagonal member at a predetermined position. After that, a new lower floor slab or a new upper floor slab is installed so as to be connected to the diagonal members, and the method for constructing diagonal members in a composite truss bridge. 6. The upper end of the existing lower floor slab is fixed on both sides of the lower surface of the existing upper floor slab, while fixing the base end of each lower receiving beam arranged so that the tip end projects to the new side. Fixing the base end of each upper receiving beam arranged so that the tip projects toward the new side, and providing jigs for holding diagonal members to the upper and lower receiving beams of each side, respectively. A method for constructing a diagonal member in a composite truss bridge, characterized in that after the diagonal members are held by upper and lower jigs, a new lower floor slab or a new upper floor slab is provided so as to be connected to the diagonal member.