CN221142500U - Steel truss girder falling construction tool - Google Patents

Abstract

The application relates to a steel truss girder falling construction tool which comprises hoisting equipment, a sliding assembly, a girder falling assembly and two lifting assemblies acting on two ends of a steel truss girder, so as to realize the technical scheme that the steel truss girder is assembled at a low position, lifted integrally and transversely moved to complete girder falling in place. Compared with in-situ casting, the prefabricated steel truss girder has the advantages of shorter manufacturing and installing time, convenient low-level assembly linear adjustment and higher installing precision. Meanwhile, the application adopts a special lifting scheme, both ends of the cross beam are stably supported by the upper bracket, the stability difficulty of lifting is overcome, the lifting and falling of the steel truss girder on the slideway girder can be realized by vertical movement, the action steps are simple, and the falling position of the steel truss girder can be effectively controlled. The application has the technical effects of at least stable lifting, low construction difficulty, effective shortening of construction period, control of construction cost and no influence on the use of existing traffic facilities, water areas and artificial facilities.

Description

Steel truss girder falling construction tool

Technical Field

The application relates to the field of bridge construction, in particular to a steel truss girder falling construction tool.

Background

When bridge construction is performed, if existing traffic facilities, water areas, artificial facilities and the like exist in a construction area, the bridge needs to span the existing traffic facilities, water areas and artificial facilities, even if existing traffic lines need to pass through the construction area, the bridge construction needs to ensure smooth and safe traffic, protective measures need to be taken to ensure that the construction process is not influenced by water flow, or interference to surrounding environment and life needs to be avoided.

The solutions conventionally adopted at present are often the following: 1. the reasonable construction scheme and time arrangement are designed; 2. plugging a water area or establishing a temporary bridge; 3. temporary traffic control measures such as guiding traffic, establishing temporary traffic roads, etc. are set. However, the above solutions have a great influence on man-made facilities, water areas and existing traffic lines, and have problems of time consuming and high construction complexity.

In addition, there are more technical problems in the construction of long span bridges in particular, if a large span steel truss needs to be installed, additional equipment and technology may be required to support and install such a large structure, and the problems of the existing facilities and the existing traffic lines are also affected by the schemes in the related art, so that the construction engineering of the large span steel truss and the like has the defects of high cost, long time consumption and high construction difficulty.

Disclosure of utility model

The application provides a steel truss girder falling construction tool for simultaneously meeting the structural requirement of the steel truss girder and the falling construction requirement. The application provides a steel truss girder falling construction tool which adopts the following technical scheme:

A steel truss girder falling construction tool comprises:

The two lifting assemblies act on two ends of the steel truss girder, the lifting assemblies comprise lifting supports, lifting supports and lifting mechanisms, the lifting supports are provided with lifting channels, or the space between the lifting supports and the pier forms the lifting channels; the lifting channel is used for assembling and placing the end parts of the steel truss girder and integrally lifting the steel truss girder; the lifting support comprises two upper supports and a cross beam connected with the tops of the two upper supports so as to form an accommodating part in a surrounding manner, the accommodating part is communicated with the lifting channel and is arranged above the lifting channel, and the two upper supports are supported by the lifting support or supported by the bridge pier and the lifting support one by one; the lifting mechanism is arranged on the cross beam and used for lifting the whole steel truss girder to the accommodating part through the lifting channel;

The steel truss girder hoisting equipment is used for hoisting each rod piece of the steel truss girder to a splicing station positioned on the working ground for manual splicing, and two ends of the splicing station are positioned in the lifting channel;

The sliding assembly comprises two slide rails, a sliding matching part and a driving mechanism for driving the steel truss to slide along the slide rails, one end of each slide rail is erected on the lifting support, the other end of each slide rail is laid on the top surface of the pier, and the two slide rails are used for supporting the two ends of the lifted steel truss and separating the accommodating part from the lifting channel; the sliding fit part is arranged on the top surface of the slideway beam along the sliding direction of the steel truss beam, and both end parts of the steel truss beam are in sliding fit with the slideway beam through the sliding fit part;

And the girder falling assembly is arranged on the pier, so that the steel truss girder is driven to fall back to the top surface of the pier after the slideway girder and the sliding fit part on the pier are removed.

Preferably, the lifting support comprises two spaced-apart lower brackets, and the lifting channel is formed by a distance space between the two lower brackets.

Preferably, the two upper brackets are respectively connected to the top surfaces of the two lower brackets one by one; the two slide rails are arranged in parallel.

Preferably, the upper bracket and the lower bracket are hollow frame structures and comprise upright posts and connecting posts for connecting the upright posts, and a platform for supporting the slideway beam and the upper bracket is arranged at the top of the lower bracket; and a mounting position for placing the slideway beam is formed between the bottom of the upper bracket and the platform.

Preferably, the steel truss girder falling construction tool further comprises 1 sliding bracket, wherein the sliding bracket is arranged between the pier and the lifting support at the same side of the obstacle to be spanned and is used for supporting one of the slideway girders; the lifting channel is arranged between the sliding support and the lifting support.

Preferably, the slideway beam comprises a supporting beam and a span beam, wherein two ends of the supporting beam are arranged on the lifting support and the sliding support, and two ends of the span beam are arranged on the sliding support/the lifting support and the bridge pier; the sliding fit part is arranged on the supporting beam and the span beam.

Preferably, the bridge lapped on the bridge pier which is distributed on the opposite side of the obstacle to be crossed with the lifting support comprises a flat girder section and an arch section, wherein the bottom of the arch section is downwards convex, and the flat girder section is paved on the bridge pier; and/or the supporting beam comprises overlap sections at two ends and a main body section connected between the overlap sections, and the bottom of the main body section is in a downward convex arch shape.

Preferably, the steel truss girder falling construction tool further comprises a pile foundation and a base station for installing the lifting support.

Preferably, the lifting mechanism comprises a jack and a steel rope for connecting the steel truss girder and an action part of the jack, and the action direction of the jack is parallel to the vertical direction so as to vertically lift the steel truss girder and vertically lower the steel truss girder.

Preferably, the driving mechanism includes a plurality of skidding carriages for supporting the middle part of the steel truss girder and rails for mounting the skidding carriages to the working floor.

In order to meet the structural requirement of the steel truss girder and the construction requirement of the girder falling at the same time, the application is characterized in that the girder falling is completed in place by splicing the steel truss girder at a low position and transversely moving the steel truss girder after the whole girder is lifted. On the one hand, compared with in-situ casting, the prefabricated steel truss girder has the advantages of shorter manufacturing and mounting time, convenient linear adjustment of low-level assembly, higher mounting precision, lower lifting requirement of low-level assembly and lower lifting operation risk. On the other hand, the scheme is not only the combination of simple low-level assembly and transverse movement beam falling, but also the lifting difficulty and the falling position accuracy control difficulty exist in the related technology. Meanwhile, the beam enables the lifting mechanism to be directly arranged above the steel truss girder and the lifting channel, and the accommodating part formed by the lifting support is communicated with the lifting channel and is separated by the slideway girder in place. The application has the technical problems that the slideway girder can prevent the steel truss girder from being lifted to a position higher than the bridge pier in the lifting process, the slideway girder is required to be installed after the steel truss girder is lifted in place, the installed slideway girder is directly positioned below the steel truss girder, a guide track which can enable the steel truss girder to slide to the position above the bridge pier from the upper part of the lifting support is formed, the lifting and falling of the steel truss girder on the slideway girder can be realized only by vertical movement, the action steps are simple, and the falling position of the steel truss girder can be effectively controlled.

Specifically, when the steel truss girder falling construction tool provided by the application is used, two lifting supports are arranged on the same side of an obstacle to be spanned, so that one lifting support and a corresponding pier are positioned on the same side of the obstacle to be spanned, the other lifting support and the pier corresponding to the other lifting support are distributed on the opposite side of the obstacle to be spanned, and the two lifting supports are communicated with the two piers one by one through the slideway girder. Because the structure of slide rail beam is much simpler than steel truss girder, and the weight of slide rail beam is also far below steel truss girder, and slide Liang Lawei installs the back, is located the obstacle and strides across the obstacle directly over, and the construction degree of difficulty of arranging slide rail beam in this step is less. And then the steel truss girder is driven to integrally slide along the slideway girder until the two ends of the steel truss girder are positioned above the corresponding piers, and girder falling operation is carried out.

Based on the same inventive concept, the girder falling construction method provided by the application is implemented in the steps of splicing the steel trusses at a low position and transversely moving the steel trusses in place after integrally lifting the steel trusses, just like the analysis, the installation of the slideway girder is required to be carried out after the steel trusses are lifted to a height position higher than the bridge pier, so that the blockage of the lifting process is avoided, the steel trusses are positioned in the accommodating part after falling on the slideway girder, and the slideway girder and the steel trusses are in sliding fit through the sliding fit part. In addition, before the steel truss beam is integrally moved transversely, whether the upper bracket close to the pier is located in a transverse moving path or not needs to be judged, whether the steel truss beam is prevented from moving transversely to the pier along the slideway beam or not needs to be judged, if the judgment result is that the steel truss beam is met, at least the cross beam located above the lifting channel, the lifting mechanism and the upper bracket close to the pier are removed, so that smooth transverse movement of the steel truss beam is ensured, and the removal and beam falling procedures of the slideway beam and the sliding fit part on the pier are completed under the action of the beam falling component.

The application ensures the construction safety and the self precision of the steel truss girder, and the whole lifting process of the steel truss girder does not need to cross obstacles, compared with the prior art, the application omits the step sequence that the lifting mechanism drives the steel truss girder to integrally translate to reach the upper part of the slideway girder, so that the lifting and falling of the steel truss girder on the slideway girder can be realized by only vertical movement, the action step sequence is simple, and the falling position of the steel truss girder can be effectively controlled. The application has the technical effects of at least stable lifting, low construction difficulty, effective shortening of construction period, control of construction cost and no influence on the use of existing traffic facilities, water areas and artificial facilities.

Drawings

Fig. 1 is a front view of the overall structure of the steel truss girder falling construction tool provided in embodiment 1 of the present utility model.

Fig. 2 is a top view of the steel truss girder dropping construction tool of fig. 1.

Fig. 3 is a right side view of the steel truss girder dropping construction tool of fig. 1.

Fig. 4 is a left side view of the steel truss girder dropping construction tool of fig. 1.

Fig. 5 is a schematic view of the steel truss girder in fig. 1 assembled at a low position in use.

Fig. 6 is a schematic view of the steel truss girder falling construction tool of fig. 1 when the steel truss girder is lifted and a support beam is not installed.

Fig. 7 is a left side view in the lifted state in fig. 6.

Fig. 8 is a schematic view of the steel truss girder falling construction tooling of fig. 6 after installation of a support beam.

Fig. 9 is a schematic view of the steel truss girder dropping construction tool of fig. 1 after the lifting bracket and the lifting mechanism are removed.

FIG. 10 is a schematic illustration of a steel truss beam traversing by a slip assembly drive to the midspan of an arched beam segment and the midspan of a support beam.

Fig. 11 is a schematic top view of fig. 10.

FIG. 12 is a schematic view of a steel truss beam traversing onto an arched beam segment driven by a slip assembly.

Fig. 13 is a schematic view of a steel truss traversing over a pier.

Reference numerals illustrate: 10-steel truss girder; 20-lifting components, 21-lifting supports, 22-lower brackets, 23-lifting brackets, 24-upper brackets, 25-crossbeams, 26-lifting mechanisms, 27-jacks, 28-steel ropes, 29-lifting channels and 30-installation positions; 31-working plane, 32-splicing station, 33-pile foundation and 34-base station; 40-hoisting equipment; 51-slideway beams, 52-supporting beams, 53-span beams, 54-flat beam sections, 55-arched beam sections and 56-pushing jacks; 60-sliding support; 71-5# pier, 72-6# pier; 80-existing railway lines.

Detailed Description

In the related art construction facing installation of a large span steel truss girder 10, it is generally required that the area be relatively flat in topography without significant undulations and obstructions. In the conventional scheme, because traffic facilities, water areas or artificial facilities exist between two piers, lifting and construction of the bridge cannot be performed directly under the two piers, and extra equipment and technology are required to support and install such a large girder 10 structure with a high probability.

In order to meet the structural requirement of the steel truss girder 10 and the girder falling construction requirement at the same time, the application is characterized in that the steel truss girder 10 is assembled at a low position, and the girder falling is completed in place by transversely moving after the steel truss girder 10 is integrally lifted. On the one hand, compared with in-situ casting, the prefabricated steel truss beam 10 is shorter in manufacturing and mounting time, convenient in linear adjustment of low-level assembly, higher in mounting precision, lower in hoisting requirement of low-level assembly and lower in hoisting operation risk. On the other hand, the scheme is not only the combination of simple low-level assembly and transverse movement falling beams, but also the lifting difficulty and the falling position accuracy control difficulty exist in the related technology. The present application is described in detail below with reference to FIGS. 1-13 by way of two specific examples.

Examples

The embodiment of the application discloses a steel truss girder falling construction tool. Referring to fig. 1, the steel truss girder dropping construction tool includes a lifting device 40, a sliding assembly, a girder dropping assembly, and two lifting assemblies 20 acting on both ends of a steel truss girder 10. The lifting assembly 20 comprises a lifting support 21, a lifting bracket 23 and a lifting mechanism 26, wherein the lifting support 21 is provided with a lifting channel 29, or a space between the lifting support 21 and the pier forms the lifting channel 29; the lifting channel 29 is used for assembling and placing the end parts of the steel truss girder 10 and integrally lifting the steel truss girder 10; the hoisting device 40 is used for hoisting each rod piece of the steel truss girder 10 to the splicing station 32 located on the working plane 31 for manual assembly, and two ends of the splicing station 32 are located in the lifting channel 29, so that the assembled steel truss girder 10 is directly located in the lifting channel 29, and subsequent lifting steps can be performed without hoisting again. The lifting support 23 comprises two upper supports 24 and a cross beam 25 connected with the tops of the two upper supports 24 so as to surround into a containing part, the containing part is communicated with the lifting channel 29 and is arranged above the lifting channel 29, and the two upper supports 24 are supported by the lifting support 21 or by the bridge piers and the lifting support 21 one by one; the lifting mechanism 26 is arranged on the cross beam 25 and is used for lifting the whole steel truss girder 10 to the accommodating part through the lifting channel 29, both ends of the cross beam 25 are stably supported by the upper bracket 24, and the stability difficulty of lifting is overcome. The sliding assembly comprises two slide rails 51, a sliding fit part and a driving mechanism for driving the steel truss girder 10 to slide along the slide rails 51, one end of the slide rails 51 is arranged on the lifting support 21, the other end of the slide rails is paved on the top surface of the pier, the two slide rails 51 are used for supporting two ends of the lifted steel truss girder 10 and separating the accommodating part from the lifting channel 29, that is, the lifted steel truss girder 10 is required to be located above the slide rails 51, in order to avoid the obstruction of the slide rails 51 to the lifting operation of the steel truss girder 10, the slide rails 51 are required to be installed after the steel truss girder 10 is lifted in place, the installed slide rails 51 are directly located below the steel truss girder 10, and a guide rail for enabling the steel truss girder 10 to slide to the upper side of the pier from the upper side of the lifting support 21 is formed, so that the lifting and falling of the steel truss girder 10 on the slide rails 51 can be realized only by vertical movement, and the action steps are simple, and the falling position of the steel truss girder 10 can be effectively controlled. The sliding fit portion is arranged on the top surface of the slideway beam 51 along the sliding direction of the steel truss beam 10, and two end portions of the steel truss beam 10 are in sliding fit with the slideway beam 51 through the sliding fit portion, so that the whole sliding of the steel truss beam 10 is realized, and the steel truss beam 10 reaches the upper part of the pier. The girder falling assembly is arranged on the pier, so that the steel truss girder 10 is driven to fall back to the top surface of the pier after the slideway girder 51 and the sliding fit part on the pier are removed, girder falling construction is completed, and all tool components can be removed.

It should be noted that, when the steel truss girder falling construction tool provided by the application is used, the two lifting supports 21 are both arranged on the same side of the obstacle to be spanned, so that one lifting support 21 and the corresponding pier are positioned on the same side of the obstacle to be spanned, the other lifting support 21 and the pier corresponding to the other lifting support are distributed on the opposite side of the obstacle to be spanned, and the two lifting supports 21 and the two piers are communicated one by one through the slideway beam 51. Because the structure of the slideway beam 51 is much simpler than that of the steel truss beam 10, and the weight of the slideway beam 51 is far lower than that of the steel truss beam 10, the slideway beam 51 is positioned right above the obstacle to cross the obstacle after being installed in a falling position, and the construction difficulty of arranging the slideway beam 51 is low. And then the steel truss girder 10 is driven to integrally slide along the slideway girder 51 until both ends are positioned above the corresponding piers, and girder falling operation is carried out.

Since the splicing station 32 for splicing and assembling the steel truss girder 10 on the working plane 31 is performed, in order to ensure the splicing accuracy of the steel truss girder 10, the plane corresponding to the splicing station 32 needs to be subjected to leveling, hardening and other treatments. In order to achieve low-level assembly, the height difference between the splicing station 32 and the working plane 31 is controlled to be within a reasonable range as much as possible, and preferably, the splicing station 32 is directly formed by a part of the surface of the working plane 31. In this embodiment, the working plane 31 is obtained by casting, tamping, hardening, and leveling.

In order to ensure that stable support is provided, in this embodiment, the steel truss girder falling construction tool further includes a pile foundation 33 and a base 34 for installing the lifting support 21, as shown in fig. 1 and 3, so as to ensure support of the lifting support 21 and stability of the structure above the lifting support 21, provide support for the subsequent steps, and embed the pile foundation 33 into the hardened ground structure.

In this embodiment, as shown in fig. 2-3, the lifting support 21 includes two lower brackets 22 disposed at intervals, the lifting channel 29 is formed by a space between the two lower brackets 22, each lower bracket 22 is mounted on a corresponding base 34, and on the transverse projection of the steel truss 10, the splicing and lifting of the steel truss 10 are performed between the two lower brackets 22, so as to enhance the support to the slideway beam 51, and further enhance the stability.

It should be noted that, the present application is not limited to the support mounting position 30 of the upper bracket 24 closer to the bridge pier, the upper bracket 24 may be supported by the bridge pier, and the slideway beam 51 may be mounted in place more smoothly when the length of the accommodating portion is longer than the slideway beam 51. In this embodiment, the two upper brackets 24 are respectively connected to the top surfaces of the two lower brackets 22 one by one, that is, the two upper brackets 24 are connected and supported by the two lower brackets 22 one by one, and the structural design can effectively reduce the overall length of the cross beam 25, thereby controlling the cost and reducing the weight, and being beneficial to the safety and stability of the overall construction. At this time, before the sliding, at least the cross beam 25 and the upper bracket 24 closer to the bridge pier need to be removed to smoothly slide the steel truss 10 as a whole.

In order to facilitate control and simplify the scheme, in this embodiment, the two slide beams 51 are arranged in parallel, and have the same length, and preferably, the two slide beams are symmetrical with each other along the middle distance line of the two bridge piers, so that the two ends of the steel truss beam 10 synchronously slide in an integral transverse movement manner, and further, the position accuracy is controlled.

In order to achieve the structural strength of the upper bracket 24 and the lower bracket 22 and the installation of the slide rail beam 51, in this embodiment, the upper bracket 24 and the lower bracket 22 are hollow frame structures and comprise upright posts and connecting posts for connecting the upright posts, and a platform for supporting the slide rail beam 51 and the upper bracket 24 is arranged at the top of the lower bracket 22; an installation position 30 for placing the slideway beam 51 is formed between the bottom of the upper bracket 24 and the platform, one end of the slideway beam 51 passes through the hollow installation position 30 from the side surface of the upper bracket 24 and is placed into the lifting channel 29, and finally the slideway beam 51 is arranged on the upper bracket 24 and the top surface of the pier. Other structural reinforcement designs of the upper bracket 24 and the lower bracket 22 are referred to in the related art, and the present embodiment is not described in detail.

In order to further support the slideway beams 51 and the steel truss beams 10, in this embodiment, as shown in fig. 1, the steel truss beam falling construction tool further includes 1 sliding bracket 60, and the sliding bracket 60 is disposed between the pier and the lifting support 21 at the same side of the obstacle to be spanned, and is used for supporting one slideway beam 51; the lifting channel 29 is arranged on the lifting support 21 or the lifting channel 29 is arranged between the sliding support 60 and the lifting support 21, the slideway beam 51 and the steel truss beam 10 on the slideway beam 51 are supported in the whole process, the smooth construction is ensured, and the base 34 of the original sliding support 60 is arranged on the working plane 31.

As a preferred embodiment, the upright post of the sliding bracket 60 adopts ∅ 630,630 steel pipes, the connection system adopts phi 203 round pipes, the distribution beam adopts 1200X800 welding box beams, and the distribution beam is provided with a slideway beam 51.

In order to optimize Shi Gongbu sequences and reduce installation difficulty, in this embodiment, as shown in fig. 3 and 4, the slideway beam 51 includes a supporting beam 52 and a bridge span 53, two ends of the supporting beam 52 are set up on the lifting support 21 and the sliding support 60, and two ends of the bridge span 53 are set up on the sliding support 60/the lifting support 21 and the bridge pier; the sliding fit parts are arranged on the supporting beams 52 and the span beams 53, the span beams 53 do not affect the whole lifting of the steel truss beams 10, the steel truss beams 10 can be installed and fixed in advance, and only the supporting beams 52 need to be installed after the whole lifting of the steel truss beams 10, so that the construction period is effectively shortened. Meanwhile, the slideway beam 51 is divided into two parts, so that the lifting difficulty can be reduced, and the safety can be improved.

To facilitate mating with the steel truss girder 10 and installing the skid mating portion, it is preferable that the top surface of the support beam 52 and the top surface of the bridge 53 are both planar and co-planar.

In the case of a large span, the bridge 53 is a direct member for supporting the steel truss 10, and since the auxiliary support reinforcement is not performed by the sliding brackets 60 under the bridge 53 on the bridge side, the bridge 53 itself on the bridge side is required to have a higher strength, and therefore, the bridge 53 is costly and heavy, and a larger-sized lifting mechanism 26 is required. In order to control the cost and enhance the stability, in this embodiment, the bridge 53 overlapped with the bridge 53 of the bridge pier which is to be spanned on the opposite side of the obstacle from the lifting support 21, that is, the bridge 53 on the bridge side, includes a plate girder segment 54 and an arched girder segment 55 with a bottom protruding downward, and the plate girder segment 54 is laid on the bridge pier, as shown in fig. 3. While the other bridge 53 may be a flat plate beam section 54 directly, as shown in fig. 4, the bridge 53 on the flying lead side may be the same structure, which is not limited by the present application.

Similarly, the middle of the support beam 52 is located within the hoistway 29, taking into account the stiffening of the support beam 52. In some embodiments, an auxiliary bracket may be added below the support beam 52 after the support beam 52 is installed. In this embodiment, the support beam 52 includes overlapping sections at both ends and a main body section connected between the overlapping sections, and the bottom of the main body section is in a downwardly convex arch shape, and the structural strength is reinforced by its own structure.

In this embodiment, as shown in fig. 1, the lifting mechanism 26 includes a jack 27 and a steel rope 28 for connecting the steel truss girder 10 and an action part of the jack 27, and the action direction of the jack 27 is parallel to the vertical direction to vertically lift the steel truss girder 10 and vertically lower the steel truss girder 10, thereby effectively overcoming the technical difficulties in the lifting and preliminary landing process of the steel truss girder 10 in the related art.

In this embodiment, the driving mechanism includes a plurality of skidding carriages for supporting the middle part of the steel truss girder 10 and rails for mounting the skidding carriages to the working plane 31. The steel truss girder 10 is supported and slipped, and smooth construction is ensured. Of course, the driving mechanism may also include an auxiliary driving member, such as a jack 56, disposed on the slideway beam 51 for acting on the steel truss beam 10, and may be designed according to the requirement, and the related art may be referred to, which is not described in the present embodiment.

In this embodiment, the girder falling assembly adopts 4 800 ton hydraulic jacks 27, which are respectively arranged near the stress points of the permanent supports at the pier top, and are matched with a plurality of protection cushion blocks stacked in the height direction to support the steel truss girder 10, so that the steel truss girder 10 is slowly fallen onto the permanent supports in the descending order of the number of the protection cushion blocks, and the safety and stability are ensured.

In this embodiment, as shown in fig. 1, the lifting device 40 is a 60-door machine, so as to ensure the safety and stability of the lifting process.

In order to install the lifting assembly 20, the sliding assembly, the girder falling assembly and the like, the installation and the disassembly of the structures such as the slideway girder 51, the lifting bracket 23 and the like are realized through the crane in the embodiment, so that the smooth progress of the construction process is ensured.

Taking the installation of the steel truss girder 10 between the 5# piers 71 and 6# piers 72 of the existing railway line 80 with the height Cheng Xiangcha 1.5.5 m as an example, the implementation principle and the steps of the steel truss girder falling construction tool in the embodiment of the application are described.

Step one: in order to increase the stability of the foundation, the foundation is expanded, poured, hardened and flattened on the original foundation to obtain a working plane 31, a formed pile foundation 33 and a base station 34; the lifting support 21 is mounted on the base 34, and the lifting support 23 and the lifting mechanism 26 are mounted on the two lower supports 22 of the lifting support 21. In this step, the bridge 53 on the line side, i.e., the 5# pier 71 side, may be first installed in place;

Each rod piece of the steel truss girder 10 is hoisted by using one 60 portal crane, so that the safety and stability of the hoisting process are ensured; according to the sequence of the lower chord member, the bridge deck plate, the web member and the upper chord member, hoisting each rod piece is sequentially carried out one by one internode, so that the installation according to the design requirement is ensured; and (3) carrying out penetrating and screwing of the nodes: the nodes are secured together using the punch pins and split bolts and tightened as shown in fig. 5.

Step two: the sliding bracket 60 on the 6# pier 72 side is erected, the bracket structure is built using steel pipes and welded box girders, and the bridge 53 is arranged on the distribution girder, at which time a sliding fit can be arranged on the bridge 53.

Step three: the lifting mechanism 26 uses eight 560 ton hydraulic lifting jacks 27 for integral lifting: the entire structure is lifted up to 21 meters using lifting jacks 27, as shown in fig. 6 and 7.

Step four: feeding the slide rail beam 51: feeding the support beam 52 from one side to a construction site, and installing it in place; rails are installed on the working plane 31, and eight 500-ton skidding carriages are installed on the rails for supporting the middle part of the steel truss girder 10. The steel truss 10 at 112m elevation is lowered onto the skid trolley, with the steel truss 10 resting on the skid trolley and the support beam 52. During the lowering process of the steel truss girder 10, the bridge longitudinal slope needs to be paid attention to, the heights of the 5# pier 71 and the 6# pier 72 are different by 1.5m, and the stable posture is kept during the lowering process. After the end of the No. 6 pier 72 reaches the designed elevation, the hydraulic lifting jack 27 at the end of the No. 5 pier 71 is manually controlled to be lowered, and after the elevation is reached, the steel beam is slowly placed, and the structure after installation is shown in FIG. 8.

Step five: lifting jacks 27 for lifting the steel truss girder 10, the cross beams 25 and the upper brackets 24 at the upper portions of the sliding brackets 60 are removed: the jack 27, the cross beam 25 and the bracket for lifting are removed as shown in fig. 9.

Step six: two fulcrums driving the traversing of the steel truss beam 10 to one end are located in the midspan of the arched beam segment 55 and in the midspan of the support beam 52, respectively, as shown in fig. 10 and 11.

Step seven: the steel truss beam 10 is driven to traverse to an end where both fulcrums are located on the arched beam segment 55, as shown in fig. 12.

Step eight: the steel truss 10 is driven to traverse to a point where both fulcrums are located on top of the pier, as shown in fig. 13.

Step nine: in order to ensure smooth beam falling process, the structures such as the slideway beam 51 on the pier top and the like need to be removed first. 4 800 ton hydraulic jacks 27 are adopted and are respectively arranged near the stress points of the permanent supports at the pier tops, a plurality of protection cushion blocks for stacking and supporting the steel truss girder 10 in the height direction are matched, the steel truss girder 10 is slowly dropped onto the permanent supports in the descending order of the number of the protection cushion blocks, and safety and stability are ensured.

In summary, the present embodiment provides at least the following advantages:

1. The application is characterized in that the steel truss girder is assembled at a low position, and the girder is transversely moved to be in place after the steel truss girder is integrally lifted. On the one hand, compared with in-situ casting, the prefabricated steel truss girder has the advantages of shorter manufacturing and mounting time, convenient linear adjustment of low-level assembly, higher mounting precision, lower lifting requirement of low-level assembly and lower lifting operation risk. On the other hand, the scheme is not only the combination of simple low-level assembly and transverse movement falling beams, but also the lifting difficulty and the falling position accuracy control difficulty exist in the related technology.

2. Adopts prefabricated steel truss girder: the manufacturing and installation time of the prefabricated steel joists is shorter than in-situ casting. The prefabrication of the steel truss girder can be performed in an off-site factory, and the steel truss girder is integrally hoisted to the pier by using a large crane.

2. The steel truss girder is installed at a low position only by adopting a door machine with smaller lifting capacity, so that the risk of lifting operation is small; the low-level installation line is convenient to adjust and has higher installation accuracy; the number of the brackets required by low-level installation is small, and the auxiliary construction operation time is short; the whole lifting process is mature, and the construction operation time is short.

3. The infrastructure can be prepared in advance: before construction, construction of related infrastructure, such as road leveling, pile driving of pier foundation and the like, is finished in advance so as to ensure smooth progress of the steel truss girder during installation.

4. Advanced technology and equipment can be utilized, for example, unmanned aerial vehicle is used for bridge pier measurement and mapping, measurement accuracy and construction efficiency can be improved, and manpower resource and time consumption are reduced.

5. Constructors can be reasonably planned and allocated according to construction periods and construction nodes, and continuity and high efficiency of construction are ensured.

6. The construction process can be analyzed and planned in detail by using computer simulation and virtual reality technology, potential problems and bottlenecks are found, and measures are taken in advance to optimize and improve.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. Steel truss girder falls roof beam construction frock, its characterized in that includes:

The two lifting assemblies (20) act on two ends of the steel truss girder (10), the lifting assemblies (20) comprise lifting supports (21), lifting supports (23) and lifting mechanisms (26), the lifting supports (21) are provided with lifting channels (29), or the space between the lifting supports (21) and the bridge pier forms the lifting channels (29); the lifting channel (29) is used for assembling and placing the end parts of the steel truss girder (10) and integrally lifting the steel truss girder (10); the lifting support (23) comprises two upper supports (24) and a cross beam (25) connected with the tops of the two upper supports (24) so as to form an accommodating part in a surrounding mode, the accommodating part is communicated with the lifting channel (29) and is arranged above the lifting channel (29), and the two upper supports (24) are supported by the lifting support (21) or are supported by the bridge pier and the lifting support (21) one by one; the lifting mechanism (26) is arranged on the cross beam (25) and is used for lifting the whole steel truss girder (10) to the accommodating part through the lifting channel (29);

The steel truss beam (10) hoisting equipment (40) is used for hoisting each rod piece of the steel truss beam (10) to a splicing station (32) positioned on the working ground for manual splicing, and two ends of the splicing station are positioned in the lifting channel (29);

The sliding assembly comprises two slide rails (51), a sliding matching part and a driving mechanism for driving the steel truss girder (10) to slide along the slide rails (51), one end of the slide rails (51) is arranged on the lifting support (21), the other end of the slide rails is paved on the top surface of the pier, and the two slide rails (51) are used for supporting two ends of the lifted steel truss girder (10) and separating the accommodating part and the lifting channel (29); the sliding fit part is arranged on the top surface of the slideway beam (51) along the sliding direction of the steel truss beam (10), and both end parts of the steel truss beam (10) are in sliding fit with the slideway beam (51) through the sliding fit part;

and the girder falling assembly is arranged on the pier, so that the steel truss girder (10) is driven to fall back to the top surface of the pier after the slideway girder (51) and the sliding fit part on the pier are removed.

2. A steel truss girder falling construction tool according to claim 1, characterized in that the lifting support (21) comprises two lower brackets (22) arranged at intervals, and the lifting channel (29) is formed by the interval space between the two lower brackets (22).

3. The steel truss girder falling construction tool according to claim 2, wherein the two upper brackets (24) are respectively connected to the top surfaces of the two lower brackets (22) one by one; the two slide beams (51) are arranged in parallel.

4. A steel truss girder falling construction tool according to claim 3, wherein the upper bracket (24) and the lower bracket (22) are hollow frame structures and comprise upright posts and connecting posts for connecting the upright posts, and a platform for supporting the slideway girder (51) and the upper bracket (24) is arranged at the top of the lower bracket (22); an installation position (30) for placing the slideway beam (51) is formed between the bottom of the upper bracket (24) and the platform.

5. A steel truss girder falling construction tool according to any one of claims 1-4, further comprising 1 sliding bracket (60), the sliding bracket (60) being arranged between the pier and the lifting support (21) on the same side of the obstacle to be crossed, for supporting one of the slideway girders (51); the lifting channel (29) is arranged on the lifting support (21) or the lifting channel (29) is arranged between the sliding support (60) and the lifting support (21).

6. The steel truss girder falling construction tool according to claim 5, wherein the slideway girder (51) comprises a supporting girder (52) and a span girder (53), two ends of the supporting girder (52) are arranged on the lifting support (21) and the sliding support (60), and two ends of the span girder (53) are arranged on the sliding support (60)/the lifting support (21) and the bridge pier; the sliding fit part is arranged on the supporting beam (52) and the span beam (53).

7. The steel truss girder falling construction tool according to claim 6, wherein the bridge (53) overlapped with the bridge pier which is distributed on the opposite side of the obstacle to be crossed with the lifting support (21) comprises a flat girder section (54) and an arch section with the bottom protruding downwards, wherein the flat girder section (54) is paved on the bridge pier; and/or the support beam (52) comprises overlapping sections at two ends and a main body section connected between the overlapping sections, and the bottom of the main body section is in a downward convex arch shape.

8. A steel truss girder dropping construction tool as claimed in any one of claims 1 to 4, further comprising a pile foundation (33) and a base (34) for mounting the lifting support (21).

9. A steel truss girder dropping construction tool according to any one of claims 1 to 4, wherein the lifting mechanism (26) comprises a jack (27) and a steel rope (28) for connecting the steel truss girder (10) and an action part of the jack (27), the action direction of the jack (27) being parallel to the vertical direction to vertically lift the steel truss girder (10) and vertically lower the steel truss girder (10).

10. A steel truss girder drop construction tool according to any of claims 1-4, characterized in that the driving mechanism comprises a plurality of skidding carriages for supporting the middle part of the steel truss girder (10) and rails for mounting the skidding carriages to the working floor.