CN114875804A - Erection construction method for prefabricated box girder of spliced wide bridge - Google Patents
Erection construction method for prefabricated box girder of spliced wide bridge Download PDFInfo
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- CN114875804A CN114875804A CN202210670616.4A CN202210670616A CN114875804A CN 114875804 A CN114875804 A CN 114875804A CN 202210670616 A CN202210670616 A CN 202210670616A CN 114875804 A CN114875804 A CN 114875804A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention discloses a construction method for erecting a prefabricated box girder of a spliced wide bridge, which comprises the steps of dismantling an anti-collision fence on one side of an old bridge needing to be spliced wide, installing a bridge erecting machine, passing through holes of the bridge erecting machine and feeding the girder, and repeating the steps of passing through the holes of the bridge erecting machine and feeding the girder to finish the erection of the whole bridge. The construction method of the invention fully utilizes the existing structure of the conventional bridge girder erection machine to improve the applicability and flexibility of the bridge girder erection machine, so that the conventional bridge girder erection machine can adopt the conventional bridge girder erection machine to implement the construction process of girder erection under the condition that the height difference exists between the old bridge deck and the top of the wide splicing bridge capping beam and the width of the wide splicing bridge capping beam cannot meet the requirement of the placement of the front support leg transverse rail of the bridge girder erection machine, thereby reducing the construction cost, greatly accelerating the construction progress and improving the construction efficiency.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method for erecting a prefabricated box girder of a spliced wide bridge.
Background
With the rapid development of economy, the traffic capacity of expressways built in early China is far from meeting the traffic capacity of vehicles in the current situation, so that channels (road surfaces) need to be widened to meet the traffic capacity of the vehicles. The bridge widening is a form of widening a channel, and a conventional bridge girder erection construction process is generally adopted in erection of a prefabricated box girder of the widened bridge. However, when the old bridge deck and the wide splicing bridge capping beam top have a height difference and the width of the wide splicing bridge capping beam is insufficient, the front support leg transverse moving rail of the bridge girder erection machine cannot be placed, the bridge girder erection construction process cannot be used, two large truck cranes can be respectively placed on two sides of the to-be-erected cross capping beam for double-crane lifting, but due to the limitation of the crane span of the truck cranes and other factors, the positions of the truck cranes need to be frequently moved, the construction period of the bridge girder erection is too long, the expenditure is too high, the construction of the truck cranes has requirements on the site, the poor site needs foundation treatment, and additional construction cost is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a construction method for erecting a prefabricated box girder of a spliced wide bridge, which fully utilizes the existing structure of a conventional bridge erecting machine to improve the applicability and flexibility of the bridge erecting machine, so that the conventional bridge erecting machine can adopt the conventional bridge erecting machine to implement the construction process of the bridge erecting under the conditions that the height difference exists between the old bridge deck and the spliced wide bridge capping beam top and the width of the spliced wide bridge capping beam cannot meet the requirement of the placement of a front support leg transverse rail of the bridge erecting machine, thereby reducing the construction cost, greatly accelerating the construction progress and improving the construction efficiency.
The purpose of the invention is realized by adopting the following technical scheme:
a construction method for erecting a prefabricated box girder of a spliced wide bridge comprises the following steps:
s1, dismantling the collision-prevention fence of the old bridge:
dismantling the anti-collision fence on one side of the old bridge, which needs to be spliced and widened;
s2, mounting a bridge crane:
supporting rear support legs on two opposite sides of the bridge girder erection machine on a bridge deck of an old bridge and a bridge deck of a foundation beam close to a new bridge capping beam respectively in a height-consistent manner, wherein a middle support leg transverse moving track of the bridge girder erection machine spans the old bridge deck and the foundation beam and is leveled at the bottom of the middle support leg transverse moving track by using a cushion piece, supporting rear support wheels on two opposite sides of the bridge girder erection machine on the bridge deck of the old bridge and the bridge deck of the foundation beam respectively in a height-consistent manner, wherein a front support leg transverse moving track of the bridge girder erection machine is cancelled, front support legs on two opposite sides of the bridge girder erection machine are arranged on the bridge deck of the old bridge and a stop block of the new bridge capping beam respectively in a height-consistent manner, and the heights of the front support legs supported on the stop blocks are adjusted by an adjusting device so as to make the heights of the front support legs on the two opposite sides of the bridge girder erection machine consistent;
s3, bridging machine via hole:
advancing the through hole of the bridge girder erection machine in the step S2, so that the front support leg at the first side of the bridge girder erection machine is supported on the bridge deck of the old bridge, and the front support leg at the second side of the bridge girder erection machine is supported on the stop block of the next bridge cover beam through the adjusting device;
s4, feeding beams of the bridge girder erection machine:
using a beam transporting vehicle to transport the prefabricated box girder to the tail part of the bridge girder erection machine, hoisting the prefabricated box girder by a hoisting crown block of the bridge girder erection machine to move forward to a bridge position to be constructed, adjusting the aerial posture and the installation position of the prefabricated box girder, and lowering the prefabricated box girder so that one end of the prefabricated box girder is fixed on one of two adjacent bridge cover girders, and the other end of the prefabricated box girder is fixed on the other of the two adjacent bridge cover girders;
and repeating the steps S3 and S4 until the whole bridge is erected.
Further, before performing step S2, the flange plate of the crash barrier is cut and removed.
Further, in step S1, the removed anti-collision fence is the anti-collision fence on one side of the emergency lane arranged on the old bridge, and after the anti-collision fence is removed, the emergency lane on the old bridge is closed and a temporary hard anti-collision pier is arranged.
Furthermore, a first channel steel is connected between the front supporting legs at two opposite sides of the bridge girder erection machine.
Furthermore, a second channel steel arranged opposite to the first channel steel is connected between the front supporting legs at two opposite sides of the bridge girder erection machine.
Furthermore, the adjusting device is a steel plate with a cushion or a square wood block or a steel pipe.
Further, the cushion piece comprises a plurality of square wood blocks arranged at intervals.
Furthermore, a square wood block is padded at the bottom of the front supporting leg on the first side of the bridge girder erection machine.
Furthermore, the bottoms of the rear supporting legs on two opposite sides of the bridge girder erection machine are respectively padded with a square wood block.
Furthermore, square wood blocks are arranged at the bottoms of the rear riding wheels on two opposite sides of the bridge girder erection machine.
Compared with the prior art, the invention has the beneficial effects that:
according to the prefabricated beam frame construction method for the split-width bridge, the existing structure of the conventional bridge girder erection machine is fully utilized to improve the applicability and flexibility of the bridge girder erection machine, so that the conventional bridge girder erection machine can be used for implementing a beam erection construction process under the conditions that the height difference exists between the old bridge deck and the top of the split-width bridge capping beam and the width of the split-width bridge capping beam is insufficient, the construction cost is reduced, the construction progress is accelerated, and the construction efficiency is improved.
Drawings
FIG. 1 is a flow chart of the present invention for prefabricating a bridge frame for a wide bridge;
FIG. 2 is a schematic cross-bridge view illustrating the removal of the crash barriers and the flange plates of the old bridge according to the embodiment of the present invention;
FIG. 3 is a schematic view of a middle leg arrangement of a bridge girder erection machine according to an embodiment of the invention;
FIG. 4 is a schematic view of a front leg arrangement of a bridge girder erection machine according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a bridge girder erection machine in a ready-to-pass initial state according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of a bridge girder erection machine in a via hole state according to an embodiment of the present invention;
FIG. 7 is a first structural schematic diagram of a beam feeding state of the beam transporting vehicle according to the embodiment of the invention;
FIG. 8 is a second structural schematic diagram of the beam feeding state of the beam transporting vehicle according to the embodiment of the invention;
FIG. 9 is a first structural schematic diagram of a bridge girder erection state of the bridge girder erection machine according to the embodiment of the invention;
fig. 10 is a second structural schematic diagram of a bridge girder erection state according to an embodiment of the invention.
In the figure: 10. an old bridge; 101. an anti-collision fence; 1011. a flange plate; 102. hard anti-collision piers; 103. an emergency lane; 20. a new bridge; 201. a bridge deck; 2011. a stopper; 30. a bridge girder erection machine; 301. a front leg; 302. hoisting the overhead traveling crane; 303. a middle support leg; 3031. the middle support leg transversely moves the track; 30310. a cushion member; 304. a rear leg; 305. a rear riding wheel; 31. an adjustment device; 32. a first channel steel; 40. carrying a beam vehicle; 50. prefabricating a box girder; 501. and (4) a support.
Detailed Description
The present invention will be described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the following description, various embodiments or technical features may be arbitrarily combined to form a new embodiment without conflict.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The implementation mode is as follows:
referring to fig. 1-10, the invention discloses a construction method for erecting a prefabricated box girder of a spliced wide bridge, which comprises the following steps:
s1, dismantling the collision-prevention fence 101 of the old bridge 10:
dismantling the anti-collision fence 101 on one side of the old bridge 10 which needs to be spliced;
s2, mounting the bridge girder erection machine 30:
supporting rear legs 304 of opposite sides of a bridge girder erection machine 30 on a deck of an old bridge 10 and a deck of a foundation girder adjacent to a capping beam of a new bridge 20 in a height-uniform manner, respectively, and a middle leg traverse rail 3031 of the bridge girder erection machine 30 straddles the deck of the old bridge 10 and the deck of the foundation girder and is leveled at the bottom of the middle leg traverse rail 3031 using a pad 30310, supporting rear idlers 305 of opposite sides of the bridge girder erection machine 30 on the deck of the old bridge 10 and the deck of the foundation girder in a height-uniform manner, respectively, wherein the traverse rails of front legs 301 of the bridge girder erection machine 30 are removed, the heights of the front legs 301 of opposite sides of the bridge girder erection machine 30 are arranged on the deck of the old bridge 10 and on stoppers 2011 of the capping beam of the new bridge 20, respectively, and the heights of the front legs 301 of opposite sides of the bridge girder erection machine 30 are adjusted by adjusting means 31 to make the heights of the front legs 301 of opposite sides of the bridge girder erection machine 30 uniform;
s3, passing through the holes by the bridge girder erection machine 30:
the bridge girder erection machine 30 in the step S2 advances through the hole, so that the front leg 301 on the first side of the bridge girder erection machine 30 is supported on the bridge deck of the old bridge 10, and the front leg 301 on the second side is supported on the stopper 2011 of the next bridge cover girder 201 through the adjusting device;
s4, feeding beams of the bridge girder erection machine:
using a girder transporting vehicle 40 to transport the prefabricated box girder 50 to the tail part of the bridge girder erection machine 30, hoisting the prefabricated box girder 50 by a hoisting overhead crane 302 of the bridge girder erection machine 30 to move forward to a bridge position to be constructed, adjusting the aerial posture and the installation position of the prefabricated box girder 50, and lowering the prefabricated box girder 50 so that one end of the prefabricated box girder 50 is placed on one of two adjacent bridge cover girders 201 and the other end of the prefabricated box girder 50 is placed on the other of the two adjacent bridge cover girders 201;
and repeating the steps S3 and S4 until the whole bridge is erected.
Therefore, firstly, the crash barrier 101 on one side of the old bridge 10 is removed, on one hand, due to the construction requirement of splicing the box girders of the new and old bridge 10, and on the other hand, due to the middle support leg transverse rail 3031 of the bridge girder erection machine 30 spanning the new and old bridge 10; wherein, the transverse direction refers to the width direction of the bridge deck; when the crash barrier 101 is removed, the bridge girder erection machine 30 is installed, and the bridge girder erection machine 30 of this embodiment removes the transverse moving tracks of the front support legs 301 on the basis of the structure of the existing bridge girder erection machine 30, so that the front support legs 301 on the opposite sides of the bridge girder erection machine 30 have the same structure as the rear support legs 304 on the opposite sides of the bridge girder erection machine 30, but the transverse moving tracks of the middle support legs 303 are left, and thus, the transverse moving tracks 3031 of the middle support legs cannot move in this case.
Secondly, in the case that a height difference exists between the bridge deck of the old bridge 10 and the top of the wide splicing bridge cover beam 201 or the width of the wide splicing bridge cover beam 201 is insufficient, the front leg 301 and the rear leg 304 on the first side of the bridge girder erection machine 30 are supported on the bridge deck of the old bridge 10, the rear leg 304 on the second side of the bridge girder erection machine 30 is supported on the bridge deck of the foundation beam close to the bridge cover beam 201, and the heights of the rear legs 304 on the opposite sides of the bridge girder erection machine 30 are made to be identical, the middle leg traversing rail 3031 of the bridge girder erection machine 30 spans the bridge deck of the old bridge 10 and the foundation beam, and is flatly padded at the bottom of the middle leg traversing rail 3031 by using a padding member 30310 to avoid the phenomenon that the middle leg traversing rail 3031 inclines and is overturned, the rear riding wheels 305 on the opposite sides of the bridge girder erection machine 30 are respectively supported on the bridge deck of the old bridge 10 and the foundation beam and the height of the two rear riding wheels 305 is made to be identical, the front leg 301 on the bridge deck of the bridge cover beam close to the foundation beam 201 through an adjusting device, thereby completing the high-low erection construction of the support leg system of the bridge girder erection machine 30.
Next, the bridge girder erection machine 30 advances through the hole, so that the front leg 301 on the first side of the bridge girder erection machine 30 is supported on the deck of the old bridge 10, and the front leg 301 on the second side of the bridge girder erection machine 30 is supported on the stopper 2011 on the outer side (the side far from the old bridge 10) of the next bridge deck 201 by the above-mentioned adjusting device, so that the bridge girder erection machine 30 is ready to enter the girder feeding condition.
Finally, the precast box girder 50 is transported to the tail part of the bridge girder erection machine 30 by using the girder transport vehicle 40, the precast box girder 50 is hoisted by the hoisting overhead crane 302 of the bridge girder erection machine 30 to move forward to the bridge site to be constructed, the aerial posture and the installation position of the precast box girder 50 are adjusted, the precast box girder 50 is accurately lowered onto the support 501, the erection of a hole girder (the precast box girder 50 on two adjacent bridge cover girders 201) is completed, and the steps of passing holes and feeding the girder by the bridge girder erection machine 30 are repeated until the whole bridge is erected.
It should be noted that the construction steps of passing holes and feeding beams by the bridge girder erection machine 30 are mature and conventional technical means in the field of bridge construction, and therefore, detailed description is not given here, and reference may be made specifically to a bridge girder erection method using the bridge girder erection machine 30 disclosed in chinese patent (publication No. CN 114319145A).
In summary, the construction method for erecting the prefabricated box girder 50 for the split-width bridge provided by the invention fully utilizes the existing structure of the conventional bridge girder erection machine 30 to improve the applicability and flexibility of the bridge girder erection machine 30, so that the conventional bridge girder erection machine 30 can adopt the construction process for girder erection by the conventional bridge girder erection machine 30 under the conditions that the height difference exists between the bridge floor of the old bridge 10 and the top of the split-width bridge girder 201 and the width of the split-width bridge girder 201 is insufficient; compared with the bridge girder erection machine 30 which is specially used for erecting the spliced wide bridge, the bridge girder erection machine 30 does not need to be modified or replaced, and the time and the cost for entering and assembling the bridge girder erection machine 30 are saved; compared with the construction method using two truck crane hanging beams, the invention saves the lease cost of the truck crane, saves the time and the materials for field treatment and saves the transfer time of the truck crane; therefore, the construction method for erecting the spliced wide bridge prefabricated box girder 50 can reduce the construction cost and accelerate the construction progress.
In this embodiment, before the step S2 is performed, the flange plate 1011 of the crash barrier 101 needs to be cut and removed to splice the old bridge 10 and the new bridge 20 together. It can be understood by those skilled in the art that after the flange plate 1011 of the crash barrier 101 is removed, the steel bars of the old bridge 10 are chiseled out from the side where the new bridge 20 is spliced, so that the steel bars of the new bridge 10 are connected to achieve the effect of splicing the new bridge 10.
In the present embodiment, in step S1, the removed crash bar 101 is the crash bar 101 on the side where the emergency lane 103 is provided on the old bridge 10, and after removing the crash bar 101, the emergency lane 103 on the old bridge 10 is closed and the temporary hard crash block 102 is provided. As can be seen, the influence on the traffic lane on the bridge surface of the old bridge 10 can be reduced to the maximum extent by removing the crash barrier 101 on the bridge surface of the old bridge 10 on the side close to the emergency traffic lane 103 and closing the emergency traffic lane 103 on the old bridge 10. Of course, the temporary hard anti-collision pier 102 is mainly provided to further improve the construction safety of the present invention, and prevent vehicles running on the old bridge 10 from entering the construction area when a traffic accident occurs, so as to affect the construction safety.
In this embodiment, the adjusting device is a padded steel plate or a square wood block or a steel pipe, the first channel steel 32 is connected between the front support legs 301 on the two opposite sides of the bridge girder erection machine 30, and since the front support leg 301 on the second side of the bridge girder erection machine 30 is padded up by the adjusting device, the height of the front support leg 301 on the second side of the bridge girder erection machine 30 is consistent with that of the front support leg 301 on the first side of the bridge girder erection machine 30, in order to stabilize the stability of the front support legs 301 on the two opposite sides of the bridge girder erection machine 30, the stability of the front support legs 301 on the two opposite sides of the bridge girder erection machine 30 is enhanced by the first channel steel; further, a second channel steel arranged opposite to the first channel steel is connected between the front support legs 301 on two opposite sides of the bridge girder erection machine 30, and the stability of the front support legs 301 on two opposite sides of the bridge girder erection machine 30 is further enhanced through the second channel steel.
In this embodiment, the pad 30310 includes a plurality of square wood blocks spaced apart from each other, and the bottom of the front leg 301 on the first side of the bridge girder erection machine 30 is padded with the square wood blocks; the bottoms of the rear supporting legs 304 on the two opposite sides of the bridge girder erection machine 30 are respectively padded with square wood blocks, and the bottoms of the rear riding wheels 305 on the two opposite sides of the bridge girder erection machine 30 are respectively padded with square wood blocks. The height of the front, middle and rear supporting legs and the rear supporting wheels is adjusted by adding the square-padded wood blocks, so that the height of the bridge girder erection machine can be adjusted more easily, the bridge girder erection machine can adapt to bridge decks with different cross slopes and height differences, the whole bridge girder erection machine is kept horizontal, and the construction safety of the prefabricated girder erection is improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A construction method for erecting a prefabricated box girder of a spliced wide bridge is characterized by comprising the following steps:
s1, dismantling the collision-prevention fence of the old bridge:
dismantling the anti-collision fence on one side of the old bridge, which needs to be spliced and widened;
s2, mounting a bridge crane:
supporting rear support legs on two opposite sides of the bridge girder erection machine on a bridge deck of an old bridge and a bridge deck of a foundation beam close to a new bridge capping beam respectively in a height-consistent manner, wherein a middle support leg transverse moving track of the bridge girder erection machine spans the old bridge deck and the foundation beam and is leveled at the bottom of the middle support leg transverse moving track by using a cushion piece, supporting rear support wheels on two opposite sides of the bridge girder erection machine on the bridge deck of the old bridge and the bridge deck of the foundation beam respectively in a height-consistent manner, wherein a front support leg transverse moving track of the bridge girder erection machine is cancelled, front support legs on two opposite sides of the bridge girder erection machine are arranged on the bridge deck of the old bridge and a stop block of the new bridge capping beam respectively in a height-consistent manner, and the heights of the front support legs supported on the stop blocks are adjusted by an adjusting device so as to make the heights of the front support legs on the two opposite sides of the bridge girder erection machine consistent;
s3, bridging machine via hole:
advancing the through hole of the bridge girder erection machine in the step S2, so that the front support leg at the first side of the bridge girder erection machine is supported on the bridge deck of the old bridge, and the front support leg at the second side of the bridge girder erection machine is supported on the stop block of the next bridge cover beam through the adjusting device;
s4, feeding beams of the bridge girder erection machine:
using a beam transporting vehicle to transport the prefabricated box girder to the tail part of the bridge girder erection machine, hoisting the prefabricated box girder by a hoisting crown block of the bridge girder erection machine to move forward to a bridge position to be constructed, adjusting the aerial posture and the installation position of the prefabricated box girder, and lowering the prefabricated box girder to enable one end of the prefabricated box girder to be placed on one of two adjacent bridge cover girders and the other end of the prefabricated box girder to be placed on the other of the two adjacent bridge cover girders;
and repeating the steps S3 and S4 until the whole bridge is erected.
2. A construction method for erecting a prefabricated box girder for a wide spliced bridge as defined in claim 1, wherein before the step S2 is performed, the flange plate of the collision preventing fence is cut and removed.
3. A construction method for erecting a prefabricated box girder of a split-width bridge according to claim 1, wherein in step S1, the removed crash barrier is a crash barrier on one side of an emergency lane provided on the old bridge, and after the crash barrier is removed, the emergency lane on the old bridge is closed and a temporary hard crash pier is provided.
4. A construction method for erecting a prefabricated box girder of a split-width bridge as claimed in claim 1, wherein a first channel steel is connected between front supporting legs at two opposite sides of the bridge girder erection machine.
5. A construction method for erecting a precast box girder for a wide spliced bridge as recited in claim 4, wherein a second channel steel arranged opposite to the first channel steel is connected between front support legs at opposite sides of the bridge girder erection machine.
6. A construction method for erecting a prefabricated box girder of a split wide bridge according to claim 1, wherein the adjusting device is a cushioned steel plate, a square wood block or a steel pipe.
7. A construction method for erecting a prefabricated box girder of a split wide bridge according to claim 1, wherein the cushion member comprises a plurality of square wood blocks arranged at intervals.
8. A construction method for erecting a prefabricated box girder of a split-width bridge as claimed in claim 1, wherein a square wood block is padded at the bottom of the front leg on the first side of the bridge erecting machine.
9. A construction method for erecting a prefabricated box girder of a split-width bridge as claimed in claim 1, wherein the bottoms of the rear legs at two opposite sides of the bridge girder erection machine are padded with square wood blocks.
10. A construction method for erecting a prefabricated box girder of a split-width bridge as claimed in claim 1, wherein the bottoms of the rear riding wheels at two opposite sides of the bridge girder erection machine are provided with square wood blocks.
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| CN202210670616.4A CN114875804A (en) | 2022-06-14 | 2022-06-14 | Erection construction method for prefabricated box girder of spliced wide bridge |
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