JPH10204830A - Method for bridging bridge girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for bridging a bridge girder that can bridge a bridge girder positively for a short construction period of time even in no adequate working space in the upper direction. SOLUTION: This method comprises the steps of installing a bridge girder installation machine 4 crossing over the ready installed girders, mounting on the bridge girder installation machine 4 lift-furnished movable truck 5 that can move in the longitudinal direction of the bridge girder installation machine 4, attaching a previously formed bridge girder side surface block 7 to each lift to be transported successively between the ready installed bridge girders, connecting a plurality of the transported bridge girder side surface blocks 7 for constructing one side surface main girder to be installed between the ready bridge girders 1 and slid to be disposed at one side in the pier width direction. In the next place, the side surface main girders at the other side are connected likewise before formation and installation to be slid and disposed at the other side in the girder width direction by keeping distances from the side surface main girders at one side, and concrete is placed for a girder floor system in a space between both the side surface main girders for connecting both the main girders.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge construction method of a so-called iron bridge type having a substantially U-shaped cross section.
Generally, for example, when a so-called iron bridge type bridge girder having a substantially U-shaped cross section across a river is bridged, a double-tracked track is formed between both side walls having the substantially U-shaped cross section, and a train runs on the track. .

[0002]

2. Description of the Related Art Conventionally, as a method of bridging a so-called iron bridge type bridge girder having a substantially U-shaped cross section, a method shown in FIGS. 8 and 9 has been known (generally referred to as a cast-in-place method).
For example, a strong support 30 is assembled in advance so as to withstand the concrete load of the bridge girder to be formed, and a bridge girder forming form 31 having a substantially U-shaped cross section is assembled thereon, and concrete is placed in the form 31. After the casting, prestress is introduced, and the structure can be supported at both ends of a pair of piers.

[0003] Although such a construction method is generally used on site, it is extremely difficult to erect the above-mentioned shoring work 30 on roads and rivers, and as a result, bridge girder construction is extremely difficult with this construction method. It will be difficult. In addition, since the bridge girder formwork 31 having a substantially U-shaped cross section is further assembled on the assembled support structure 30, the height has to be large, and it is a difficult construction method in a place where there is no room above.

[0004] Next, the method shown in FIG. 10 (extrusion method)
Has also been known for some time. That is, the bridge girder is formed at a position behind the erection location, a hand-rolling machine 32 is attached to the leading end side, connected, and then moved by using a device pulled out to bridge. This method is used in a place where a shoring cannot be erected. However, since the hand-rolling machine 32 is attached to the front side, the hand-rolling machine 32 moves forward if there is no room for the length in the forward direction when moving. There are things you can't do.

Further, FIGS. 11 and 12 show a conventional construction method (a combined construction method of using a supporting girder 33 and a hanging gate type 34).
In this conventional method, a support girder 33 is provided to straddle between adjacent bridge piers, and a main girder on the side of the bridge girder is formed thereon. After completion, the slab is moved to a predetermined position by a suspension device 35 above the suspension gate type 34, installed, and then slab-cast.

[0006] In this method, even when a shoring cannot be used, a girder can be manufactured on the supporting girder.
For example, if a three-dimensional highway or a railway track is formed in the upward direction because of the requirement of 4, the work cannot be performed because the work space above cannot be taken.

[0007]

SUMMARY OF THE INVENTION Thus, the present invention has been made in view of the above-mentioned conventional problems, does not require a large formwork, requires a minimum formwork, and has a large suspension gate. There is no need for a model-type suspension device, which requires only the minimum necessary suspension device. In addition, a three-dimensionally formed highway or track is installed above the bridge girder installation point, and there is sufficient work space. It is an object of the present invention to provide a bridge girder bridging method capable of bridging a bridge girder surely and with a short construction period even if the bridge girder is not in the upward direction.

[0008]

According to the bridge girder bridging method of the present invention, a bridge girder erection machine is erected over an existing pier, and a hanger movable in the longitudinal direction of the bridge girder erection machine on the bridge girder erection machine. With the movable trolley is mounted, a pre-formed bridge girder side block is attached to the hoisting tool, sequentially transported between the existing bridge girders, and the plurality of transported bridge girder side blocks are connected to one side. Construct the side main girder and install it between the existing piers, slide it to one side in the pier width direction and arrange it, then connect the other side main girder in the same way, configure and erection, It is arranged by sliding to the other side in the bridge pier width direction at an interval from the side main girder on the side, and a bridge girder slab connecting the two main girders is cast in concrete in the space between the main girder on both sides. It is characterized by doing
Alternatively, a bridge girder erection machine is erected between the existing piers, and a movable trolley with a hanger movable in the longitudinal direction of the girder erection machine is placed on the girder erection machine, and the hanger is formed in advance. Attached bridge girder side blocks, sequentially transported between existing bridge girders, tightly connected the plurality of transported bridge girder side blocks to form one side main girder, and erected between existing bridge piers. , Slide it to one side in the bridge pier width direction, and then tightly connect, configure and bridge the other side main girder in the same way, and leave a space with the one side main girder in the pier width direction. It is characterized by having been slid to the side, a bridge girder slab that tightly connects the two main girders is cast in concrete in the space between the main girders on both sides, or between existing piers. A bridge girder erection machine is erected A movable carriage with a hanger movable in the longitudinal direction of the bridge girder erection machine is placed on the top, a pre-formed bridge girder side block is attached to the hanger, and the carriage is sequentially transported between the existing bridge girder, A plurality of bridge girder side blocks are tightly connected to form a side main girder on one side, installed between existing piers, slid to one side in the pier width direction, and then placed on the other side main girder. The girder is similarly tightly connected, constructed and erected, and slid to the other side in the bridge pier width direction with an interval from one side main girder, and the space between the main girder on both sides is The bridge girder slab for tightly connecting the two main girder is constructed by casting concrete, and the bridge girder slab is formed by sliding the bridge girder from a form carrier movably mounted on the bridge girder erection machine. Close the space between the two main girders with a formwork, Characterized in that it was Da設 the over door.

(Operation) According to the present invention, instead of forming a bridge girder having a substantially U-shaped cross section and having a predetermined length at once, blocks for main girder on both sides are prepared in advance in a factory, To the existing bridge girder. After transportation, these are connected in the longitudinal direction to form a plate-shaped side main girder, and finally, the floor slab between the pair of both side main girder is finished on site.

[0010] The work moving range in which the side main girder block is moved up and down to work is small, and as a result, work equipment does not collide even if another highway is formed above. The formation of the floor slab can be performed in a divided manner, and finally, the slab is tightly connected. Therefore, a strong bridge girder can be formed without requiring any large equipment.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bridge girder bridge construction method according to the present invention will be described. In FIGS. 1 to 7, reference numeral 1 denotes an existing pier standing upright in a river 2. A bridge girder 3 of a railway bridge type is installed on the piers 1 and 1. First, a bridge girder erection machine 4 is erected between the existing piers 1 and 1.

As can be seen from the figure, the pier erection machine 4 has a movable carriage 5 mounted thereon, which can be moved in the longitudinal direction of the bridge girder erection machine 4. The movable trolley 5 has a suspender 6
The hanging tool 6 is configured such that a bridge girder side block 7 is hung. here,
The bridge girder side block 7 is formed in advance in a forming factory.

The bridge girder block 7 usually has a weight of 60 tons and a length of 6 to 7 meters. Thus, the plurality of bridge girder side blocks 7 are connected to the piers 1,
Move between 1 Finally, in the present embodiment, six to seven bridge girder side blocks 7 are tightly connected by a PC steel bar or the like between a pair of piers 1 and 1 to form a bridge girder side main girder 8.
(Usually gross weight 420 tons, total length 420 meters)
(See FIG. 4).

The six or seven bridge girder side blocks 7
The main girder 8 on one side of the bridge girder formed by connecting the bridge piers 1 is erected and temporarily placed between the pair of existing piers 1 and 1. To the position of. Next, the other side of the bridge girder side main girder 8 is connected and tightly connected in the same manner as the one side bridge girder side main girder 8, and at a predetermined position in the width direction of the pier 1, that is, the one side bridge girder side main girder 8. And place it at an interval.

Subsequently, from the upper surface of the pier erection machine 4 above the two installed bridge girder side main girders 8, 8, both bridge girder side main girder 8, 8 are attached to the lower surface of the bridge girder main girder 8, 8. The slab forming formwork 9 is attached so as to form the slab 10 connecting the slabs 8. Here, as understood from FIGS. 3 and 4, the floor slab construction formwork 9 is a formwork formed by, for example, the length of the bridge pier side block 7 in the longitudinal direction.

In addition, instead of a large formwork having a size corresponding to the length in the longitudinal direction of the pier side block 7, it is constituted as a divided formwork of a type capable of being divided into three in the longitudinal direction. This is because even if the formwork is only the length of the pier side block 7 in the longitudinal direction, the total weight of the concrete poured into the formwork is extremely heavy and the predetermined formwork strength is maintained. This makes it difficult to do so.

Further, the formwork 9 for floor slab construction is a form carrier 1 that moves on the upper surface of the pier erection machine 4 as understood from FIG.
1, a pair of holding arms 12, 12 are hung down from both sides, and formwork bodies 13, 13 are rotatably attached to the ends thereof. FIG. 3 shows a state in which the form bodies 13 are installed, and concrete is cast from this state. Also, at that time, the weight becomes heavy,
Since the form bodies 13 may be bent downward, the form bodies 13 are suspended by the suspending members 14.

As described above, between the existing piers 1, 1, the three-story type slab construction formwork 9 can be freely moved by the formwork carriage 11 which moves on the upper surface of the bridge girder erection machine 4.
In addition, the formwork can be installed not only at one place but also at several places between the piers 1 and 1. As can be understood from FIG. 4, in this embodiment, two floor slab construction forms 9 are used between the existing piers 1 and 1 with an interval of about one and a half of the bridge girder side blocks 7. The floor slab 10 is formed.

After the installation of the slab formwork 9, concrete is poured into the slab formwork 10 to form the slab 10. At this time, a PC steel rod is used to cure and solidify the concrete for a required time and to tightly connect the main girder 8 on one side of the bridge girder, the floor slab 10 and the main girder 8 on the other side of the girder in the width direction. And a prestress is applied to connect the one-side bridge girder side main girder 8, the floor slab 10, and the other-side bridge girder side main girder 8 to each other.

As described above, the assembling of the formwork for floor slab, the concrete casting, and the required time for the length of the block 7 for the bridge girder side by side are sequentially performed, and the concrete is cured and solidified. 8, penetrate the PC steel bar to tightly connect the floor slab 10 and the other side of the bridge girder 8 and apply a prestress to the one side of the bridge girder 8, the floor slab 10 and the other side of the other side. Work to connect the main girder 8 on the side of the bridge girder.

Finally, the entire floor slab 10 is completed between the existing piers 1 and 1. At this time, a plurality of PC steel rods are also inserted from the longitudinal direction side of the completed floor slab 10, and prestress is applied also in the longitudinal direction to make a tight connection.

[0022]

[Effect of the Invention] Thus, the present invention has the above-mentioned structure. If the bridge girder bridge construction method of the present invention is used, a large formwork is not required, a minimum formwork is required, and a large suspension gate is required. There is no need for a model-type suspension device, which requires only the minimum necessary suspension device. In addition, a three-dimensionally formed highway or track is installed above the bridge girder installation point, and there is sufficient work space. The bridge girder can be bridged reliably and in a short period of time even if it is not in the upward direction.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view (part 1) showing a construction state of a bridge girder side block in the present invention.

FIG. 2 is a configuration explanatory view (part 2) showing a construction state of a bridge girder side block in the present invention.

FIG. 3 is a configuration explanatory view (part 1) showing a construction state of a floor slab in the present invention.

FIG. 4 is a configuration explanatory view (part 2) showing a construction state of a floor slab in the present invention.

FIG. 5 is a schematic explanatory view (part 1) of the crosslinking method of the present invention.

FIG. 6 is a schematic explanatory view (part 2) of the crosslinking method of the present invention.

FIG. 7 is a schematic explanatory view (part 3) of the crosslinking method of the present invention.

FIG. 8 is a schematic explanatory view (part 4) of the crosslinking method of the present invention.

FIG. 9 is an explanatory diagram (part 1) of a configuration of a conventional example.

FIG. 10 is a diagram (part 2) illustrating the configuration of a conventional example.

FIG. 11 is an explanatory diagram (part 3) of a configuration of a conventional example.

FIG. 12 is an explanatory diagram (part 4) of a configuration of a conventional example.

FIG. 13 is a configuration explanatory view (part 5) of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge pier 2 River 3 Bridge girder 4 Bridge girder erection machine 5 Moving trolley 6 Hanging tool 7 Bridge pier side block 8 Bridge girder side main girder 9 Floor slab construction form 10 Floor slab 11 Form trolley 12 Holding arm 13 Form body 14 Hanging body DESCRIPTION OF SYMBOLS 30 Shoring 31 Formwork 32 Hand roll machine 33 Supporting girder 34 Hanging gate type 35 Hanging device

Claims (3)

[Claims] 1. A bridge girder erection machine (4) is erected between existing piers (1, 1), and is mounted on the bridge girder erection machine (4) with a hanger movable in the longitudinal direction of the bridge girder erection machine. A truck (5) is placed, a pre-formed bridge girder side block (7) is attached to the hoisting tool (6), and the bridge is sequentially transported between the existing bridge girders (1, 1). The bridge girder side block (7) is connected to form a side main girder (8) on one side, and the existing pier (1,
1) While being erected between them, they are slid to one side in the bridge pier width direction and arranged, and then the other side main girder (8) is connected in the same manner.
The main girder (8, 8) is slid to the other side in the width direction of the pier with an interval from the main girder (8) on one side. A method of bridging a bridge girder, wherein a bridge girder slab (10) for connecting a main girder is cast in concrete. 2. A bridge girder erection machine (4) is erected between existing piers (1, 1), and is mounted on the bridge girder erection machine (4) with a hanger movable in the longitudinal direction of the bridge girder erection machine. A truck (5) is placed, a pre-formed bridge girder side block (7) is attached to the hoisting tool (6), and the bridge is sequentially transported between the existing bridge girders (1, 1). The side girder blocks (7) are tightly connected to form one side main girder (8), which is installed between the existing piers (1, 1), and is slid to one side in the pier width direction. Then, the other side main girder (8) is similarly tightly connected, constructed and erected, and slid to the other side in the bridge pier width direction at an interval from the one side main girder (8). In the space between the main girders (8, 8) on both sides, a bridge girder slab (1) that tightly connects both main girders is provided. Bridge construction method of a bridge girder, wherein the bridge girder is constructed by placing concrete in 0) 3. A bridge girder erection machine (4) is erected between the existing piers (1, 1), and is mounted on the bridge girder erection machine (4) with a hanger movable in the longitudinal direction of the bridge girder erection machine. A truck (5) is placed, a pre-formed bridge girder side block (7) is attached to the hoisting tool (6), and the bridge is sequentially transported between the existing bridge girders (1, 1). The side girder blocks (7) are tightly connected to form one side main girder (8), which is installed between the existing piers (1, 1), and is slid to one side in the pier width direction. Then, the other side main girder (8) is similarly tightly connected, constructed and erected, and slid to the other side in the bridge pier width direction at an interval from the one side main girder (8). In the space between the main girders (8, 8) on both sides, a bridge girder slab (1) that tightly connects both main girders is provided. 0) is constructed by casting concrete, and the bridge girder slab (10) is formed by the bridge girder erection machine (4).
A bridge girder, wherein the space between the two main girders is closed by a rotatable form (9) suspended from a form carrier (11) movably mounted thereon, and concrete is cast thereon. Cross-linking method.