CN220767754U - Auxiliary device for pushing construction of lower-bearing steel truss arch bridge - Google Patents

Abstract

The utility model discloses an auxiliary device for pushing construction of a lower-bearing steel truss arch bridge, which comprises a walking jack positioned at the top of two rows of a plurality of temporary piers and two steel cushion beams positioned between two steel longitudinal beams of which the bottom surfaces are inverted V-shaped longitudinal slopes with high middle and low two ends along the length direction, wherein a plurality of steel cushion blocks are fixed on the top plane of each steel cushion beam, and the top surface of each steel cushion block is consistent with and mutually attached to the bottom slope of the length position of each steel longitudinal beam; the length of each steel bolster is shorter than that of each steel longeron; the two ends of each steel bolster are fixedly connected with respective steel guide beams, each steel bolster and the steel guide beams at the two ends are integrated, and the steel guide beams at the two ends of each steel bolster are cut out after the lower bearing type steel truss arch bridge is pushed in place. The main steel girder of the bridge can not be damaged in the pushing construction process by adopting the auxiliary device, and only the normal reinforcing structure and the supporting structure are needed for the joint of the steel guide girders, and steel is relatively saved.

Description

Auxiliary device for pushing construction of lower-bearing steel truss arch bridge

Technical Field

The utility model relates to the technical field of construction of a lower-bearing steel truss arch bridge, in particular to an auxiliary device for pushing construction of a lower-bearing steel truss arch bridge.

Background

The pushing construction of the underpinning type steel truss arch bridge is common prior art, and is generally to construct a permanent pier and a plurality of temporary piers, assemble the underpinning type steel truss arch bridge on the shore, and then integrally push the underpinning type steel truss arch bridge assembled on the shore onto the preset permanent piers and position by utilizing a slideway, pushing equipment such as a walking jack and the like arranged at the top of each temporary pier. And then dismantling the equipment and the temporary bridge pier. It is to be understood that the two steel stringers in the deck girder are respectively placed on the two piers symmetrically arranged in the width direction of the bridge at the same position in the length direction.

And (3) pushing construction of the lower-bearing steel truss arch bridge, wherein the bottom surfaces of the two steel longitudinal beams of the bridge deck steel beam are on the same horizontal plane along the length direction, and the lower-bearing steel truss arch bridge is obtained according to a conventional pushing construction method.

However, in the prior art, there is a structure that the bottom surfaces of two steel stringers of the bridge deck girder are not on the same straight line horizontal plane along the length direction, for example, the bottom surfaces of two steel stringers are in an inverted V shape with high middle and low two ends along the whole length direction, that is, the bottom surfaces of two steel stringers of the bridge deck girder are in a longitudinal slope shape with high middle and low two ends. For the pushing construction of the lower-bearing steel truss arch bridge with the shape of the bottom surface of the steel longitudinal beam, the construction process is troublesome, and the height of each jack needs to be readjusted to adapt to the longitudinal gradient of the bottom surface of the steel longitudinal beam every time the walking jack on each temporary pier is pushed, so that the operation is complex and the construction efficiency is low.

The technical proposal of the leveling structure solves the technical problems is that a backing beam is respectively added on the bottom surface of a steel longitudinal beam of an inverted V-shaped main steel beam with high middle and low two ends along the length direction, the bottom surface of the backing beam is a horizontal plane, and the top surface of the backing beam is matched with the gradient of the bottom surface of the inverted V-shaped steel longitudinal beam. After the structure is adopted, the technical problems are basically solved, and the pushing construction process can be adapted to the requirement of bridge pushing with longitudinal gradient on the bottom surface of the steel longitudinal beam without adjusting the height of the jack.

However, the above structure still has the following disadvantages: 1. because every steel guide girder and two every steel longerons welded fastening of bridge floor girder steel, push away the construction and accomplish the back again from every steel longeron with the steel guide girder of both ends cut off, welding and cutting process inevitably hurt mechanical properties and steel construction of two steel longerons in the bridge floor girder steel, in order to avoid minimizing this injury moreover, constructor has to adopt a large amount of or call to surpass a series of protection measures such as reinforced structure and bearing structure of normal junction on two steel longerons of bridge floor girder steel and respective steel guide girder, both increase substantially material cost and manpower, reduced the efficiency of construction again. 2. For the construction site, even though the longitudinal gradient of the steel longitudinal beam of the bridge deck girder, namely the length direction, is only 1%, the height from the length of hundreds of meters to the highest point in the middle to about two meters is quite normal, and as the cushion girder is an integral body, no matter a solid steel body or a hollow steel box girder structure is adopted, the steel is very consumed, the solid steel is well understood, while the hollow bracket type has higher height, the more the number of vertical supports, the smaller the interval between the vertical supports, the greater the thickness of each interval support, and the more the steel is consumed.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the auxiliary device for pushing construction of the downward-bearing steel truss arch bridge, which does not harm the main steel girder of the bridge in the pushing construction process, only needs a normal reinforcing structure and a supporting structure for the joint of the steel guide girders, and relatively saves steel.

The technical scheme of the utility model is that an auxiliary device for pushing construction of a lower-bearing steel truss arch bridge is provided, which is characterized in that: the multi-steel-cushion-block lifting jack comprises two steel cushion beams positioned between a walking jack positioned at the top of two rows of a plurality of temporary piers and two steel longitudinal beams with the bottom being an inverted V-shaped longitudinal slope with the middle high and the two low ends along the length direction, wherein the top plane of each steel cushion beam is parallel to the bottom plane, a plurality of steel cushion blocks are fixed on the top plane of each steel cushion beam, and the top surface of each steel cushion block is consistent with and mutually attached to the bottom slope of the length position of each steel longitudinal beam; the length of each steel bolster is shorter than that of each steel longeron; the two ends of each steel bolster are fixedly connected with respective steel guide beams, each steel bolster and the steel guide beams at the two ends are integrated, and the steel guide beams at the two ends of each steel bolster are cut out after the lower bearing type steel truss arch bridge is pushed in place.

After the structure is adopted, the auxiliary device for pushing construction of the under-bearing steel truss arch bridge has the following advantages:

because the bottom surface of the steel cushion beam is a bottom plane, such as a horizontal plane, and because the top surface of each steel cushion block is consistent with the gradient of the bottom inclined plane of the length position of the steel longitudinal beam and is mutually attached, the top plane of the steel cushion beam is abutted against the steel longitudinal beam of the inverted V-shaped longitudinal slope by a plurality of steel cushion blocks, the pushing construction process of the lower-bearing type steel truss arch bridge can adapt to the pushing of the longitudinal gradient of the bottom surface of the steel longitudinal beam without adjusting the elevation of the walking jack, and the lower-bearing type steel truss arch bridge with the inverted V-shaped longitudinal slope can be stably and reliably pushed to the position, above the permanent bridge pier, of the two ends of the steel longitudinal beam section by section. And the stress of the walking jacks is balanced, so that each walking jack can have good bearing capacity and pushing capacity, the pushing construction operation of the under-bearing steel truss arch bridge is simple, and the construction safety and the construction efficiency are high.

And because the length of the steel bolster is shorter than that of the steel longitudinal beam in the bridge deck girder, the two end parts of the steel longitudinal beam drop onto the permanent pier after the downward-bearing steel truss arch bridge is pushed in place, and drop onto the permanent pier at the top end of the permanent pier as follows. The steel girder and the steel guide beam are integrated, so that the effect that the steel girder guides the steel girder, namely the whole underpinning type steel truss arch bridge, to a preset position is fully exerted, the steel girder integrated with the steel girder is firm in structure, strong in bearing capacity and good in mechanical property, and smooth in transition between the steel girder and the steel girder is ensured, and the underpinning type steel truss arch bridge pushed in place is smoothly, stably and reliably implemented on a permanent pier, such as a permanent pier below.

Because every steel guide beam is not welded and fixed with two every steel longitudinal beams of the bridge deck girder steel, but the steel guide beam integrated with the steel pad beam completely avoids the damage to the steel longitudinal beams of the main girder steel caused by welding and cutting the steel guide beam and the steel longitudinal beams of the main girder steel in the pushing construction process, and effectively ensures the excellent mechanical property and high-quality steel structure property of the main girder steel. And to the junction of steel nose girder and every steel bolster, owing to be an holistic girder steel, so only need the following normal reinforced structure, and need not adopt excessive reinforcement and bearing structure for the protection main girder steel, and then reduced material cost and cost of labor by a wide margin to the efficiency of construction has been improved by a wide margin.

The steel cushion beam can be reused, the height of the steel cushion beam is generally less than one meter, and particularly, the bottom surfaces of two steel longitudinal beams of the bridge deck steel beam are in a space with the height of about 2 meters in the middle, which is formed by the longitudinal slope shapes with high middle and low two ends, and a plurality of steel cushion blocks are adopted for supporting at intervals in the extending degree direction, so that the quality requirements of the supporting strength and rigidity of the bridge deck steel beam in the pushing construction process of the downward-bearing steel truss arch bridge can be completely ensured, and compared with the whole cushion beam, the steel is greatly saved.

Further, each steel bolster is a steel box girder, and the cross section of each steel bolster is trapezoid with big top and small bottom. After the structure is adopted, the steel bolster has better mechanical property, firmer, more stable and more reliable structure, mature preparation process and further improved construction efficiency.

Further, the steel guide beams at the two ends of each steel pad beam are extension sections of the trapezoid steel box beams with the cross sections of big top and small bottom towards the two ends. After the structure is adopted, the technical effects of firm structure, strong bearing capacity, good mechanical property and smooth transition between the steel guide beam and the steel bolster of the steel guide beam integrated with the steel bolster are further ensured.

Further, the middle of the length of the longitudinal steel beam is taken as a boundary in the plurality of steel cushion blocks, the top surfaces of the plurality of steel cushion blocks at the left end are inclined surfaces with left low and right high, and the heights of the plurality of steel cushion blocks at the left end are gradually decreased from the middle to the left end; the top surfaces of the plurality of steel cushion blocks at the right end are inclined surfaces with lower right and higher left, and the heights of the plurality of steel cushion blocks at the right end are gradually decreased from the middle to the right end. After the structure is adopted, the top surface of each steel cushion block is consistent with the bottom inclined surface slope of the length position of the corresponding longitudinal steel beam, the mutual laminating degree is better, the degree of abutment between the steel cushion blocks on the steel cushion blocks and the plurality of steel cushion block seats and the longitudinal steel beam of the inverted V-shaped longitudinal slope is better, and the technical effects that the longitudinal steel beam lower bearing type steel truss arch bridge with the inverted V-shaped longitudinal slope is stably, reliably and stably pushed section by section, and each jack has good bearing capacity and pushing capacity are further ensured.

Further, each steel bolster is welded and fixed with a plurality of steel cushion blocks. After the structure is adopted, the steel cushion block base and the steel cushion beam are welded into a whole, so that the auxiliary device has better mechanical property, more firm, more stable and more reliable structure, and further ensures the technical effects of simple pushing construction operation, safe construction and high construction efficiency of the underlaying steel truss arch bridge.

Further, a reinforcing structure formed by a plurality of transverse connecting rods and a plurality of oblique connecting rods is welded between the two steel guide beams at each end. After the structure is adopted, the steel guide beam has firm structure, good mechanical property and strong bearing capacity, does not need excessive reinforcement and supporting structure, further saves material cost and labor cost, and further improves construction efficiency.

Further, at the both sides of the width direction of the under-bearing steel truss arch bridge, the steel bolster, the steel guide beam and a plurality of steel cushion blocks fixed on the steel bolster are symmetrically arranged: the number, shape, location and size are all the same. After the structure is adopted, the symmetry of the two sides of the width direction of the lower-bearing type steel truss arch bridge is better, the mechanical property is better, the bearing capacity is stronger, the synchronism of pushing processes of the walking jacks on the two sides is better, and the technical effects that the lower-bearing type steel truss arch bridge with the steel longitudinal beam with the inverted V-shaped longitudinal slope is pushed stably, reliably and stably section by section and each jack has good bearing capacity and pushing capacity are further ensured.

Drawings

Fig. 1 is a schematic structural diagram of the auxiliary device of the present utility model applied to the pushing construction of a downward-bearing steel truss arch bridge (the arch bridge is pushed to the installation position, and the same is true in fig. 4; can be understood to be pushed from the left shore; and is seen from the top).

Fig. 2 is an enlarged schematic view of the structure of fig. 1 a.

Fig. 3 is an enlarged schematic view of the structure of fig. 1B.

Fig. 4 is a schematic diagram of a second structure (side view) of the auxiliary device applied to the pushing construction of the underlaying steel truss arch bridge.

FIG. 5 is a schematic view of the auxiliary device of the present utility model (right end portion omitted; steel bolster is shown without steel guide beam; one steel stringer is shown)

The figure shows: 1. reinforcing structure, 2, steel cushion blocks, 3, steel arched girders, 4, steel cross beams, 5, steel longitudinal connecting rods, 6, steel longitudinal beams, 7, vertical steel supports, 8, walking jacks, 9, foundations, 10, steel guide girders, 11, permanent piers, 12, temporary piers, 13, steel cushion girders, 14, end parts, 15, temporary struts, 16, slideways, 17, oblique connecting rods, 18 and transverse connecting rods.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. It should be noted that the description of these embodiments is for aiding in understanding the present utility model, but is not to be construed as limiting the utility model. In addition, the technical means involved in the respective embodiments of the present utility model described below may be combined with each other as long as they do not constitute a conflict with each other.

As shown in fig. 1, 2, 3, 4 and 5.

The prior art underbearing steel truss arch bridge comprises a steel arch beam 3, a bridge deck steel beam and a plurality of vertical steel supports 7. The bridge deck girder steel of the underlaying type steel truss arch bridge comprises two steel longitudinal beams 6 symmetrically arranged on two sides of the width of the bridge, a plurality of steel cross beams 4 fixed with the two steel longitudinal beams 6 and a plurality of steel longitudinal connecting rods 5 fixed with the plurality of steel cross beams 4 and positioned in the middle of the width of the bridge. In the pushing construction in the prior art, a plurality of permanent piers 11 and a plurality of temporary piers 12 fixed on a foundation 9 or a river bed are firstly constructed, a lower-bearing steel truss arch bridge is assembled on the shore, and then the whole lower-bearing steel truss arch bridge assembled on the shore is pushed onto the permanent piers 11 and positioned by utilizing a slideway 16 arranged at the top of each temporary pier 12, pushing equipment such as a walking jack 8 and the like, and two temporary struts 15 fixed on each temporary pier 12 and arranged along the length direction of the bridge. The apparatus and temporary piers 12 including temporary struts 15 are removed again, such as by removing and lifting walking jacks 8, and removing a plurality of temporary piers 12 including temporary struts 15. It is not difficult to understand: the permanent piers 11 and the temporary piers 12 on the two sides of the underlaying steel truss arch bridge in the width direction are symmetrically arranged, and the slideway 16 and pushing equipment such as the walking jack 8 and the like on the top of each temporary pier 12 are symmetrically arranged.

The utility model discloses an auxiliary device for pushing construction of a lower-bearing type steel truss arch bridge, which comprises two steel cushion beams 13, wherein the two steel cushion beams 13 are arranged between a walking jack 8 positioned at the top of two rows of a plurality of temporary piers 12 and two steel longitudinal beams 6 with inverted V-shaped longitudinal slopes with high middle and low two ends along the length direction, the top plane of each steel cushion beam 13 is parallel to the bottom plane, a plurality of steel cushion blocks 2 are fixed on the top plane of each steel cushion beam 13, and the top surface of each steel cushion block 2 is consistent with and mutually attached to the bottom slope of the length position of each steel longitudinal beam 6. The length of each steel bolster 13 is shorter than the length of each steel stringer 6. The two ends of each steel bolster 13 are fixedly connected with respective steel guide beams 10, each steel bolster 13 and the steel guide beams 10 at the two ends are integrated, and the steel guide beams 10 at the two ends of each steel bolster 13 are cut steel guide beams 10 after the lower bearing steel truss arch bridge is pushed in place.

Each steel bolster 13 is a steel box girder, and the cross section of each steel bolster 13 is trapezoid with big top and small bottom.

The steel guide beams 10 at the two ends of each steel bolster 13 are extension sections of the trapezoid steel box beams with the cross sections of big top and small bottom towards the two ends.

The middle of the length of the steel longitudinal beam 6 is taken as a boundary in the plurality of steel cushion blocks 2, the top surfaces of the plurality of steel cushion blocks 2 at the left end are inclined surfaces with left low and right high, and the heights of the plurality of steel cushion blocks 2 at the left end are gradually decreased from the middle to the left end. The top surfaces of the plurality of steel cushion blocks 2 at the right end are inclined surfaces with lower right and higher left, and the heights of the plurality of steel cushion blocks 2 at the right end are gradually decreased from the middle to the right end.

Each steel bolster 13 is welded and fixed with a plurality of steel cushion blocks 2.

The two steel guide beams 10 at each end are welded with each other with a plurality of reinforcing structures 1 consisting of transverse connecting rods 18 and a plurality of oblique connecting rods 17.

At the both sides of the width direction of the underlaying steel truss arch bridge, the steel bolster 13, the steel guide beam 10 and a plurality of steel cushion blocks 2 fixed on the steel bolster 13 are symmetrically arranged: the number, shape, location and size are all the same.

It will be appreciated that the steel bolster 13 and the steel guide beam 10 are integrally, preferably integrally formed as a single steel box girder of a length, but may also include a steel box girder of which the middle is a steel bolster, and an integral welded by two steel box girders as steel guide beams, wherein the upper and lower planes of the welded steel box girders are straight and smooth transition planes.

The pushing construction method for the under-bearing steel truss arch bridge by adopting the auxiliary device can be carried out according to the following construction steps:

1) The steel bolster 13 and the steel guide beams 10 of which the cross sections are trapezoid steel box girders with large upper parts and small lower parts are prefabricated and are hung on temporary struts 15 of a plurality of temporary piers 12 on the shore, the steel bolster 13 is arranged in the middle of the length, the steel guide beams 10 are arranged at the extension parts at the two ends, and a reinforcing structure 1 can be welded between the two steel guide beams 10 at each end. And welding a plurality of prefabricated steel cushion blocks 2 on the top plane of each steel cushion block 13 along the length direction, hanging bridge deck steel beams to the two steel cushion blocks 13 positioned on the shore, compacting the bridge deck steel beams on the top surfaces of the plurality of steel cushion blocks 2, enabling the top surfaces of the steel cushion blocks 2 to be consistent with and mutually attached to the bottom inclined planes of the length positions of the steel longitudinal beams 6, and splicing the lower-bearing steel truss arch bridges.

2) The slide way 16 arranged at the top of each temporary pier 12 and pushing equipment are used for pushing and assembling the underlaid steel truss arch bridge, the height of the temporary piers 15 at the two ends of the travel of the slide way 16 of each temporary jack 8 is not required to be adjusted in the pushing construction process, the top surface of each temporary support 15 at the two ends of the travel of the slide way 16 of each temporary jack 8 is higher than the top surface of each permanent pier 11, so that the top surfaces of the permanent piers 11 do not interfere with the movement of the steel guide beam 10 and the steel cushion beam 13 in the length direction, after one section of the slide way 16 of each temporary jack 8 is full, all the temporary jacks 8 retract piston rods to enable the steel cushion beam 13 and the steel guide beam 10 to temporarily rest on the top surfaces of the temporary supports 15 of the two rows of the plurality of temporary piers 12 at the two sides of the bridge in the width direction, each temporary jack 8 returns to the initial end of the travel of the slide way 16 at the top of each temporary pier 12, and reciprocates in this way, the underlaid steel truss arch bridge is integrally pushed to the two ends 14 of the steel girder 6 to be located right above the preset permanent piers 11.

3) And cutting and hoisting away four steel guide beams 10 with two ends comprising respective reinforcing structures 1. Cutting the steel guide beam 10, such as by using an electric saw or an oxygen cutting gun, and hoisting by using a crane.

4) Four permanent piers are fixed at the top ends of the four permanent piers 11, and the top end plane of each permanent pier is higher than the top end plane of the temporary pillar 15 at the top of the temporary pier 12. It will be understood that the construction method for fixing the permanent pier or called permanent pier is a conventional technology, for example, the steel permanent pier 11 is to weld the permanent pier with the same cross section on the top of the permanent pier 11, while the reinforced concrete permanent pier 11 is to weld the steel bar of the permanent pier with the reserved steel bar on the top of the permanent pier 11, and then to cast the reinforced concrete permanent pier with the same cross section. The top plane of the permanent pier 11 is lower than the top plane of the temporary support 15 to avoid interference, and if the permanent pier 11 is made of reinforced concrete, the top plane of the reserved steel bar is also lower than the top plane of the temporary support 15 to avoid interference after the reserved steel bar on the top plane is bent and laid down. The top plane of the permanent buttress is higher than the top planes of the two temporary struts 15 at the top of the temporary pier 12. The crawler jack 8 can be regarded as a combination of a vertical hydraulic cylinder and a horizontal hydraulic cylinder, and can be lifted and driven transversely to realize the pushing function.

5) The heights of the piston rods of all the walking jacks 8 are lowered, as shown in fig. 1, the two end parts 14 of the two steel longitudinal beams 6 are compacted on four permanent piers of the four permanent piers 11, and then the steel bolster 13 and the steel cushion block 2 welded on the top plane of the steel bolster 13 are detached and lifted away together.

The above unlabeled parts or structures or numbers are not shown (e.g., permanent buttresses and steel screws, holes, etc. are not shown). The drawings are schematic only, where the drawings do not conform to the written description or where the drawings do not conform to each other, the written description will take precedence.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. Auxiliary device is used in pushing construction of under-bearing type steel truss arch bridge, its characterized in that: the multi-steel-cushion-block lifting jack comprises two steel cushion beams positioned between a walking jack positioned at the top of two rows of a plurality of temporary piers and two steel longitudinal beams with the bottom being an inverted V-shaped longitudinal slope with the middle high and the two low ends along the length direction, wherein the top plane of each steel cushion beam is parallel to the bottom plane, a plurality of steel cushion blocks are fixed on the top plane of each steel cushion beam, and the top surface of each steel cushion block is consistent with and mutually attached to the bottom slope of the length position of each steel longitudinal beam; the length of each steel bolster is shorter than that of each steel longeron; the two ends of each steel bolster are fixedly connected with respective steel guide beams, each steel bolster and the steel guide beams at the two ends are integrated, and the steel guide beams at the two ends of each steel bolster are cut out after the lower bearing type steel truss arch bridge is pushed in place.

2. The auxiliary device for pushing construction of the underlaying steel truss arch bridge according to claim 1, wherein the auxiliary device comprises: each steel bolster is a steel box girder, and the cross section of each steel bolster is trapezoid with big top and small bottom.

3. The auxiliary device for pushing construction of the underlaying steel truss arch bridge according to claim 2, wherein the auxiliary device comprises: the steel guide beams at the two ends of each steel bolster are extension sections of the trapezoid steel box beams with the cross sections of big top and small bottom towards the two ends.

4. The auxiliary device for pushing construction of the underlaying steel truss arch bridge according to claim 1, wherein the auxiliary device comprises: the top surfaces of the plurality of steel cushion blocks at the left end are inclined surfaces with left low and right high by taking the middle of the length of the longitudinal steel beam as a boundary, and the heights of the plurality of steel cushion blocks at the left end are gradually decreased from the middle to the left end; the top surfaces of the plurality of steel cushion blocks at the right end are inclined surfaces with lower right and higher left, and the heights of the plurality of steel cushion blocks at the right end are gradually decreased from the middle to the right end.

5. The auxiliary device for pushing construction of the underlaying steel truss arch bridge according to claim 1, wherein the auxiliary device comprises: each steel bolster is welded and fixed with a plurality of steel cushion block bases.

6. The auxiliary device for pushing construction of the underlaying steel truss arch bridge according to claim 1, wherein the auxiliary device comprises: the reinforcing structure formed by a plurality of transverse connecting rods and a plurality of oblique connecting rods is welded between the two steel guide beams at each end.

7. The auxiliary device for pushing construction of the underlaying steel truss arch bridge according to any one of claims 1 to 6, wherein: the steel bolster, the steel guide beam and a plurality of steel cushion blocks fixed on the steel bolster are symmetrically arranged on two sides of the width direction of the lower bearing type steel truss arch bridge: the number, shape, location and size are all the same.