JP2968489B2 - Bridge girder delivery erection method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the technical field of erection work of a bridge girder of a bridge crossing a river.

[0002]

2. Description of the Related Art As is well known, in Japan, where there are many mountain forests and terrain close to a complicated and long coastline, not only agricultural and livestock lands, but also residential and various industrial facilities. The available plains are limited,
Therefore, devices used for such daily life and industry are scattered throughout the country, and roads and port facilities for connecting these devices are laid out in a network throughout the country.

Accordingly, a large number of port facilities such as railways, roads, and piers are constructed nationwide, and rivers and the like passing through mountain forests are steep, and therefore, such rivers, lakes and valleys of mountains must be passed. Construction conditions for constructing many bridges are indispensable for railways, roads, etc., which cannot be obtained.

By the way, there are existing railways, roads, rivers, etc. under the bridge girder on which such bridges are erected, and there are cases where the road cannot be closed during the construction of the bridge girder. May have a risk of flooding, etc.
In addition, there may be obstacles such as high-voltage transmission lines in the upper space of the bridge, which may cause inconvenience in erection of the bridge girder by a crane.

In order to cope with this, a unit bridge girder is connected to the erection assembly yard on one side of the bridge girder erection, and a hand-rolling machine is connected to the front end thereof so that it can be sent out from one abutment to the front side in advance. A method of sending out a bridge girder to be installed on an abutment or pier is widely adopted.

[0006] Referring to FIG. 6, the mode of bridge construction work for a river with respect to the method of sending out a bridge girder will be briefly described with reference to FIG. 6. , 'upon which spans the bridge girder 4 between, in the land assembly yard a ₁ of該橋base 3 side, the units girder 4 by crane 7 such' bridge pier 3, 4 '... connected connecting, cutting-edge unit Bridge girder 4 '
Connecting the hand total machine 5, by delivery device 6 is disposed in the yard A ₂ feed in front of abutments 3, although to carry out the erection construction and delivery, to erection According to the feeding method girders 4 Even if there is a river 1 or a high-voltage transmission line in the upper and lower spaces, there is a merit that there is no hindrance in the construction work. However, to bridge the bridge girder 4 of a predetermined length between the abutment 3, the abutment or the pier 3 ' There were the following problems.

Namely, there is limited space specifically for yard A ₂ feed and abutment 3 side land assembly yard A _1, and thus, the units girder 4 ', 4' ..., feed length of the hand total machine 5 pieces When the center of gravity G is located in the ground assembly yard A ₁ or the sending yard A ₂ , the center of gravity G is more stable than the sending device 6. After crossing the river 1 side, before the handwheel 5 reaches the abutment 3 or the pier 3 ', the unit bridge girder 4' at the rear end opposite to the traveling direction is negative reaction force (buoyancy). This causes serious troubles in the construction such that the hand-rolling machine 5 descends to the river 1, which may hinder the construction work.

To cope with this, each unit bridge girder 4 ',
4 'longer or earth assembled in tandem formula land assembly yard A ₁ and rear units girders 4 of the crane 7' upon coupling connects the counterweight (Hitoshi on the rear end of the unit girders 4 ' A countermeasure is taken to prevent the negative reaction force (buoyancy) from being generated by placing the contact weight 9 via the temporary bracket.

[0009] However, there is a need to be considerably large area of the space of the land assembly yard A ₁ is to take such means, work man-hours on top there is a drawback that the reclamation work is master the extremely difficult by the complex terrain, etc. However, there is a disadvantage that the construction period is lengthened and the cost is increased.

Further, in order to provide a means for placing the counterweight (equilibrium weight) 9, the work of suspending the unit bridge girder 4 'at the rear end of the crane truck 7 and the counterweight (equilibrium weight) 9 and the counterweight are carried out. There is a complicated point that the re-arrangement in the process of sending out the (balance weight) 9 is indispensable, and the unit bridge girder 4 ′ of the counterweight (balance weight) 9 is required.
However, there is a disadvantage that the work such as the provision of the temporary bracket for mounting the work and the management and the like are extremely complicated, and thus the cost is increased and the construction period is prolonged.

When the bridge girder 4 is a straight straight, construction is easy. However, there are many cases where a bridge has to adopt a curved girder method for the bridge girder. In this case, since the magnitude of the negative reaction force (buoyancy) generated in each unit bridge girder is different, the distribution of the load of the counterweight (balance weight) 9 is adjusted, and the counterweight (balance weight) 9 of the temporary bracket is used. The work of re-arrangement becomes extremely complicated, including adjustments, and there is a disadvantage that it is extremely difficult to send out the bridge girder along the design curve as planned.

[0012] The above problem is not limited to the construction of the bridge girder across the river, but is the same problem in the construction of the bridge in the road, in the steep valley, or in the lower part of the high-voltage transmission line. Was.

[0013]

It is an object of the present invention to provide a kind of delivery erection in which a bridge girder is erected between abutments and piers constructed over a river or the like based on the above-mentioned prior art. As a technical issue to solve the problem of the technology for dealing with negative reaction force (buoyancy), a holding device was installed on a gate-type structure (gate structure) that holds negative reaction force (buoyancy) into the delivery yard of the bridge girder method. An excellent bridge girder erection method that enables smooth and continuous delivery over time except for the connection of the rear unit bridge girder in the ground assembly yard of the bridge girder, which benefits the field of bridge construction technology in the construction industry. , And an apparatus used directly in the method.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the construction of the invention of the present application for constructing a bridge in a river or a steep gorge, etc. in order to solve the above-mentioned problems. The aerial abutment or the ground assembly yard that connects and connects a predetermined number of unit bridge girders between the piers is made as small as possible in the space of the area, and a gate-type structure (gate) is erected over the bridge girder in the sending yard. A holding device comprising a movable holding jack for the bridge girder along a beam provided in a direction along the bridge girder of the gate-type structure (gate structure) and a temporary receiving jack for refilling provided alongside the holding jack. And a delivery device is provided between the gate-type structure (gate structure) and the abutment or pier, and the bridge girder is advanced in a delivery manner to reduce the negative reaction force (buoyancy) at the rear end of the bridge girder. Hold down the occurrence, abutment or bridge Not only girder is straight to bridging the bridge girder between, in which taking technical means to allow erection along a curve as designed even in curves digits.

[0015]

The unit bridge girder is connected and connected in the ground assembling yard, and is sent out to the abutment or pier in front by the feeding device, and before the hand arresting machine at the tip reaches the abutment or pier. Even if the center of gravity of the bridge girder moves forward and a negative reaction force (buoyancy) is generated at the rear end of the bridge girder, the rear end of the bridge girder is pressed down by a gate-type structure (gate structure), and the gate-type structure A bridge girder is pressed forward by a movable holding jack of a holding device provided on an object (gate structure) and a temporary receiving jack for replacement provided in addition to the holding jack. In this case, the bridge girder is a straight type. Even
Even with a curved girder type, the negative reaction force (buoyancy) generated in each unit bridge girder can be given a reaction force by the portal structure (gate structure) and the holding device, so that it can be smoothly delivered and as designed. The bridge girder has been erected, and complicated work such as loading and reloading of counterweights has been omitted, shortening the construction period, reducing costs, and minimizing the space in the sending yard. It is intended to improve the safety of construction.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG.

The same parts as those in FIG. 6 are described using the same reference numerals.

In the illustrated embodiment, a bridge girder 4 is erected when a bridge is laid on a river 1. Similar to the conventional embodiment shown in FIG. When the bridge girder 4 is sent out to the abutment erected at a predetermined site or the pier 3 'in a sending-out manner, the ground assembly yard A ₁ on the abutment 3 side is used.
Advanced delivery to a predetermined by the delivery device 6 yards A ₂ feed is connected connected by cranes 7 hands total machine 5 of the tip in to abutment, or a mode in which installed between the piers 3 ', the implementation In the embodiment, the center of gravity G of the bridge girder 4 as in the conventional mode shown in FIG.
2 to 4 in place of a counter weight (balance weight) 9 for holding down a negative reaction force (buoyancy) G 'generated in a unit bridge girder 4' at the rear of the bridge girder 4 when the bridge girder 4 is moved forward. provided laying the foundation of yard a ₂ feed provided by prefixing the Shimesuru hold-down mechanism 10 to the land assembly yard a _1, said hold-down mechanism 10 is 4-post 10 _o, 10 _o ... aspect of the beam 10 to the , 10 '', and the unit bridge girder at the rear end of the bridge girder 4 is provided in an overhang shape with the rear end of the unit bridge girder 4 'inside as shown in FIGS. 2, 3 and 4. The negative reaction force (buoyancy) generated at 4 'is suppressed.

The delivery device 6 has a pinion rack in which a motor with a speed reducer is connected to a rail (not shown) so that the bridge girder 4 is placed and delivered forward in a predetermined manner. It has the same mechanism structure.

[0020] In Thus, the hold-down mechanism 10 is adapted to be installed in bridgingly state basis yard A ₂ feed through a crane 7 by predesigned is a kind of equipment structure.

Thus, in the pressing mechanism 10, the beam 1 in the direction along both side edges of the unit bridge girder 4 'at the rear end is provided.
0 ″ ′, the movable bracket 11 having a predetermined worm gear mechanism and a pinion rack mechanism is attached to the beam 1.
The movable bracket 11 is provided with a movable presser jack 12, and is provided alongside a side of the movable presser jack 12. When the jack 12 ′ is equipped and reaches the required moving distance of the movable holding jack 12, it can be returned to its original position, that is, can be changed, and the reaction force of the movable holding jack 12 can be temporarily reduced. It is designed to take charge of it.

It is to be noted that the movable holding jack 12 may be structured so as to simply slide and follow the unit bridge beam 4 '.

The movable bracket 11 has a worm gear mechanism or a pinion rack mechanism that moves back and forth at the same speed as the delivery device 6 that performs a delivery operation along a rail (not shown).

In the drawing, white arrows indicate the direction in which the bridge girder 4 is sent out.

The movable holding jack 12 and the refilling temporary receiving jack 12 'are brought into surface contact with the upper flange 13 of the unit bridge girder 4' to support the pressing reaction force.

Therefore, when the rearmost unit bridge girder 4 'of the bridge girder 4 is connected and connected, it is in a stopped state. However, except for the connection and connection, the forward advancing operation of the delivery is continuously performed. .

At the timing when the center of gravity G of the bridge girder 4 'is located ahead of the feeding device 6, a negative reaction force (buoyancy) G' tends to be generated on the rear unit bridge girder 4 '. The negative reaction force (buoyancy) G ′ is pushed down by the holding-down mechanism 10 to prevent it from rising, as shown in the step (h) of FIG. Alternatively, a hand-rolling machine 5 at its tip is sent to the pier 3 ', and reaches the abutment or the pier 3' so that the bridge girder 4 can be erected.

In the above configuration, the abutment 3 or the pier 3 'of the bridge girder 4 is referred to with reference to the process of each step diagram of FIG.
Explaining the mode of erection and erection for
_{1 and the} bridge girder 4 ', 4''... And a bridge girder 4 having a hand-held device 5 connected to the end thereof, and a narrow space in which the distance between the pressing mechanism 10 and the feeding device 6 is set as short as possible. In the delivery yard A ₂ , the rear unit bridge girder 4 ′ is interposed between the delivery device 6 and the bogie 8 to replace the movable holding jack 12 of the gate-type structure (gate structure) of the holding mechanism 10. (C) of FIG.
Step state.

[0029] At that time, in order to present on yard A ₂ delivery is the center of gravity G of該橋digit 4, 'the negative reaction force (buoyancy) G' unit girders 4 tail end does not occur.

In particular, as shown in the step (d) of FIG. 5, the bridge girder 4, which is ground-assembled by the delivery device 6 and is connected with the hand-held machine 5, is sent forward, and the rearmost unit bridge girder is the pressing mechanism. Advance to a position close to 10.

However, in the step (d) of FIG. 5, the center of gravity G is prevented from protruding before the feeding device 6.

Therefore, no negative reaction force (buoyancy) is generated in the step (d) of FIG. 5 and the pressing mechanism 10 does not yet exhibit its function.

Subsequently, in the step (e) of FIG. 5, the succeeding unit bridge girder 4 ′ is hung by the crane truck 7 on the rearmost unit bridge girder 4 ′ and connected to the rearmost unit bridge girder 4 together with the bogie 8. I do.

Accordingly, during this time, the feeding device 6 and the movable holding jack 12 of the holding mechanism 10 and the moving bracket 11 are in a stopped state, and then, as shown in the step (f) of FIG. 6 and the movable holding jack 12 of the holding mechanism 10, the feeding action is performed, and the bridge girder 4 connected to the predetermined length is moved forward on the river 1 as shown by an arrow.

During this time, since the center of gravity G moves forward beyond the delivery device 6, a negative reaction force (buoyancy) G 'is generated at the rearmost unit bridge girder 4', but the negative reaction force (buoyancy) G 'is generated. The beam 1 of the gate-type structure (gate structure) of the holding mechanism 10
0 ″, the negative reaction force (buoyancy) G ′ is pressed down by the movable holding jack 12 and the moving bracket 11.

Then, in the next step (g) in FIG. 5, the next unit bridge girder 4 ′ is connected to the last unit bridge girder 4 ′ by the crane truck 7 via the bogie 8 on the ground assembly yard A ₁ . Connecting.

Therefore, in this step, the feeding device 6 is stopped, and the movable holding jack 12 is moved back to the original position along the beam 10 '''of the portal structure (gate structure), and the movable holding jack 12 is moved back. The reaction force of the jack 12 is temporarily changed by the temporary receiving jack 12 'for changing the position, and the reaction force of the movable presser jack 12 is changed.

Then, in the step shown in FIG. 5H, the bridge girder 4 is sent out by the feeding device 6 and the movable holding jack 12, and the above-described steps are repeated, and the hand-held device 5 of the bridge girder 4 is moved. To the abutment or the pier 3 'standing upright on the river 1 to complete the construction of the bridge girder 4.

It should be noted that the embodiment of the invention of this application is not limited to the above-described embodiment. For example, the bridge girder is not limited to a straight straight girder, but can be applied to a curved girder. Even if a difference in negative reaction force (buoyancy) occurs in each unit bridge girder of the curved girder, regardless of the negative reaction force (buoyancy), the portal structure (gate structure) and the portal structure (gate) Various aspects such as being able to receive the negative reaction force (buoyancy) from the movable holding jack provided in the truss, and being able to send out the curved girder along the design curve of the curved girder. Can be adopted.

[0040]

As described above, according to the invention of this application, a bridge girder is basically used when constructing a bridge when there are steep rivers, steep valleys, existing roads, or high-voltage transmission lines or the like at the top. When carrying out the delivery type erection, the negative reaction force (buoyancy) generated at the unit bridge girder at the rear end due to the advance of the center of gravity due to the advancement of the center of gravity by sending it out from one abutment etc. The negative reaction force (buoyancy) can be supported by the pressing mechanism, and there is no need to load a counterweight (balance weight) on the unit bridge girder at the rear end as in the conventional mode. This eliminates the need for extra work such as mounting brackets for weights (equivalent weights), as well as extra work. Even if a negative reaction force (buoyancy) is generated by the bridge girder through the center of gravity of the bridge girder using a facility-like pressing mechanism, Reaction force always Lifting, and the excellent effect of smoothly be bridged to girder are achieved.

The holding device of the holding mechanism can continuously perform the feeding operation except when connecting a subsequent unit bridge girder to a unit bridge girder at the rear end of a straight type or curved type bridge girder, Therefore, the distance between the feeding device and the pressing mechanism of the gate-shaped structure (gate structure) is determined by the capacity of the gate-shaped structure (gate structure) and the holding device of the holding mechanism, and the sending-out yard can be made relatively small. Also, it is no longer necessary to make the ground assembly yard a large area space, the land space can be reduced in size, the cost can be reduced, and the merit of sending out type bridge girder can be fully utilized. In addition to the advantage of being inexpensive, there are advantages that the number of construction steps is reduced, management and control are easy, and safety is increased.

[Brief description of the drawings]

FIG. 1A is a schematic side view of an embodiment of the invention of this application, and FIG. 1B is a plan view thereof.

FIG. 2 is a schematic plan view of a pressing mechanism.

FIG. 3 is a schematic front view of the same.

FIG. 4 is a schematic side view of the same.

FIGS. 5 (c) to (h) are process schematic diagrams of each step of the delivery type erection of the bridge girder of the invention of this application.

FIG. 6 is a schematic side view of a delivery type erection method of a bridge girder based on the prior art.

[Explanation of symbols]

5 Hand pallet machine 4 'Unit bridge girder 4 Bridge girder A ₂ Sending yard 3' Abutment or pier G 'Negative reaction force (buoyancy) 10 Holding mechanism 10', 10 "Portal structure (gate) 10"" Beam 12 Movable presser jack 12 'Temporary receiving jack for refill

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-169611 (JP, A) JP-A-4-216705 (JP, A) JP-B-58-36685 (JP, B2) JP-B-60- 19362 (JP, B2) JP-B 61-2123 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01D 21/00

Claims (6)

(57) [Claims] 1. A process in which a hand girder is connected to the tip and a unit bridge girder and a ground girder assembled with the unit are sent out from a yard to an abutment or a pier in front of the unit girder. In the bridge girder erection construction method in which the generated negative reaction force (buoyancy) is held down and the bridge girder is sent out continuously, a negative reaction force (buoyancy) holding mechanism is installed in the above-mentioned sending yard to always carry the bridge girder negatively. A method of erection of bridge girder, characterized in that force (buoyancy) is sent out together with holding down. 2. The method according to claim 1, wherein said feeding is repeatedly carried out in a refillable manner. 3. The method according to claim 1, wherein the feeding of the bridge girder is used for feeding a curved girder. 4. The method according to claim 1, wherein the bridge girders are continuously fed except for connecting and connecting the following unit bridge girders. 5. A process in which a unit bridge girder having a hand-held machine connected to a tip thereof and a bridge girder assembled with a ground are delivered from a yard to an abutment or a pier in front of the unit girder, and the bridge girder is opposite to the delivery direction of the bridge girder. In a device used for a bridge girder delivery erection method for continuously sending out a bridge girder by holding down a negative reaction force (buoyancy) generated behind, a bridge-type structure (gate) overhanging the bridge girder on the delivery yard. ), And a holding device for the bridge girder is displaceably mounted on a beam in a direction along the bridge girder of the gate-type structure (gate structure). 6. An apparatus according to claim 5, wherein said presser device comprises a movable presser jack and a temporary receiving jack for refilling provided in addition to said movable presser jack.