CN110700119A - Upper traveling system of assembled Bailey beam hanging basket and design method thereof - Google Patents
Upper traveling system of assembled Bailey beam hanging basket and design method thereof Download PDFInfo
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- CN110700119A CN110700119A CN201910710779.9A CN201910710779A CN110700119A CN 110700119 A CN110700119 A CN 110700119A CN 201910710779 A CN201910710779 A CN 201910710779A CN 110700119 A CN110700119 A CN 110700119A
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- 238000000034 method Methods 0.000 title claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 65
- 239000010959 steel Substances 0.000 claims abstract description 65
- 238000010276 construction Methods 0.000 claims abstract description 24
- 238000004873 anchoring Methods 0.000 claims description 27
- 239000000725 suspension Substances 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 9
- 241001669679 Eleotris Species 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 235000014121 butter Nutrition 0.000 claims description 4
- 230000009193 crawling Effects 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 230000036316 preload Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000009415 formwork Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- E01D21/10—Cantilevered erection
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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
Abstract
The invention discloses an upper walking system of an assembled Bailey beam hanging basket and a design construction method thereof. The invention has the beneficial effects that: the walking system is arranged at the upper part of the main truss, is safer than a walking rail in a reverse buckling manner, has low risk coefficient and can be widely popularized; the walking system utilizes the main truss to replace the walking rail, the slide way adopts conventional channel steel, independent processing is not needed, materials can be recycled, and the cost is saved; the assembled Bailey beam hanging basket saves construction cost and creates good benefits for society.
Description
Technical Field
The invention relates to a hanging basket traveling system, in particular to an assembled Bailey beam hanging basket traveling system and a design construction method thereof, and belongs to the technical field of urban bridge engineering.
Background
The bridge of a train entering and exiting station section is divided into a double-line bridge and a single-line bridge, suspension casting construction is adopted for crossing a river channel and an existing road, and because the weight of a single-line beam suspension casting block section can not meet the requirement of a conventional suspension basket, an assembled Bailey beam suspension basket is specially designed, and the Bailey beam assembled suspension basket cast-in-place box girder is a construction method for symmetrically carrying out bridge girder construction along the direction of a bridge line by taking a suspension basket as an operation platform on the basis of a post-tensioning prestress construction technology.
The tail part of the hanging basket is anchored on a poured beam section by PSB830 finish-rolled deformed steel bar, a cantilever at the front end extends outwards, and a bottom die truss and a side die truss are lifted by a front suspender and a rear suspender below the cantilever, so that a supporting platform is provided for the suspended casting beam. The cast-in-place beam body is constructed in a segmented mode, the beam body structure is utilized to bear all loads in the construction process, the traditional travelling system for assembling the Bailey truss mostly adopts a mode of paving a rail on a beam surface and additionally arranging a reverse buckling wheel, the operation is not easy, great potential safety hazards exist, and the forward moving and retreating processes of the hanging basket have the risk of overturning.
Disclosure of Invention
The invention aims to solve the problems and provide an upper traveling system of an assembled Bailey beam hanging basket and a design method thereof.
The invention realizes the purpose through the following technical scheme: the utility model provides an assembled bailey beam hangs basket and goes capable system of going up, includes and hangs the basket, it includes main truss system, outer nose girder system, template system, anchor system and walks capable system to hang the basket, main truss system is the main atress structure of hanging the basket, outer nose girder system is used for supporting template system's side form weight, anchor system anchors the anchor beam in pouring the roof beam body through the preformed hole, it sets up in the parallel truss top of main truss system to walk capable system.
As a further scheme of the invention: the main truss system is composed of parallel trusses, cross beams and connecting systems, the parallel trusses are formed by assembling three Bailey beams, each cross beam comprises a front cross beam and a rear cross beam, a group of front cross beams and a group of rear cross beams are arranged at the front ends of the parallel trusses, two groups of anchoring beams are arranged at the tail parts of the parallel trusses, and the parallel trusses are connected through the connecting systems of the front cross beams and the rear cross beams.
As a further scheme of the invention: the outer guide beam system is composed of an outer guide beam and a suspension rod, the front end of the outer guide beam is suspended on a front cross beam of the cross beam through the suspension rod, and the tail portion of the outer guide beam is suspended on a flange of a poured beam body.
As a further scheme of the invention: the template system comprises side form, die block and centre form, the side form constitutes the external mold of template system with the die block, the centre form sets up the inboard at side form and die block, just the centre form is connected with outer nose girder, the side form adopts large face steel mould, the truss-like steel skeleton is adopted to the die block, the centre form adopts the wooden pattern.
As a further scheme of the invention: the anchoring system comprises an anchoring beam and a hanging strip, the anchoring beam is anchored on the poured beam body through the preformed hole, and the hanging strip is connected to two ends of the anchoring beam.
As a further scheme of the invention: the walking system comprises a slide way, the slide way is arranged above a parallel truss of the main truss system, the slide way is formed by reversely buckling six channel steel on the parallel truss formed by the Bailey beams, and grease is applied to the joint of the slide way and the parallel truss.
A design construction method of an upper traveling system of an assembled Bailey beam hanging basket comprises the following steps:
after the Bailey truss is placed, checking whether the distance between the front ends of the parallel trusses meets the conditions of construction of a suspended casting section and forward movement of a hanging basket; after the situation that no errors exist, the Bailey main truss is fixed by two 3T chain blocks respectively to prevent people from being injured by dumping, then the Bailey truss is anchored on the cross beam by the vertical prestress finish rolling deformed steel bar in the lengthened web plate through the beam pressing sleeper, the Bailey truss needs to be strictly ensured to be horizontal longitudinally and transversely when being anchored, if deviations exist, a steel plate can be used for leveling adjustment, and the central distance of the Bailey truss is strictly controlled to be consistent with the design; when the front supporting point of the main truss is not provided with a vertical upright rod, a vertical reinforcing rod needs to be added for reinforcement, a rear anchor carrying pole beam and a rear anchor hanging rod are placed and tightly tied by 2 screw jacks of 30t, 2 main trusses are respectively anchored on the beam surface, and the front end of each main truss is provided with a cross brace;
and 3, installing a slide way of the walking system, respectively measuring the positions of the front and rear upper cross beams of the cross beam before installing the slide way, and controlling the length of the slide way to be respectively longer than the positions of the front and rear upper cross beams by 50 cm. Then coating butter on the Bailey truss, and processing the front end and the rear end of the slideway into a splayed shape in advance to prevent the slideway from being propped by the Bailey pin and being incapable of moving forwards or retreating in the forward and retreating processes of the hanging basket; 6 slideways are designed for the single T-shaped structure, each slideway is 6m long, and a crane starts 1 channel steel 22 each time during installation so as to enable the channel steel to be reversely buckled at the top of the Bailey truss;
step 4, mounting the front upper cross beam and the rear upper cross beam, wherein the front upper cross beam and the rear upper cross beam are respectively made of I32B steel and I25B steel, the middle point of each cross beam is overlapped with the central line of the bridge and is placed above the slideway, the front upper cross beam and the rear upper cross beam are firmly welded with the slideway, and the front upper cross beam and the rear upper cross beam are welded into a whole by square steel;
step 5, mounting hanging strips, a lower cross beam and a bottom longitudinal beam, wherein 6 hanging strips are arranged on a front upper cross beam, 4 hanging bottom dies and 2 hanging outer side dies; 2 lifting belts are arranged on the rear cross beam, the rear lower cross beam is lifted so that the hanging basket can move forwards or backwards to walk with a belt mold, 2 short lifting belts are additionally designed on the rear lower cross beam and anchored at a position of a poured concrete reserved hole at the bottom of the beam, before the lifting belts are installed, a flat gasket is placed at the upper end of finish-rolled deformed steel bar, two nuts are installed at last, the lower part of the flat gasket is fixed by the lifting belts, after being lifted by an automobile, the automobile is vertically put down to place through the reserved holes of the front upper cross beam and the rear upper cross beam, the total 4 lifting belts are respectively provided with 1 inverted chain hoist of 10t at the end parts of the front upper;
when the lower cross beam is installed, the lower cross beam is slightly lower than the poured beam bottom concrete surface by 50-70 cm, the rear lower cross beam is temporarily fixed by a 10t chain block and a phi 25 steel wire rope on the rear upper cross beam, the lifting sling passes through a preformed hole to anchor the rear lower cross beam, the front lower cross beam and the rear lower cross beam are installed in the same way, and the front lower cross beam and the rear lower cross beam are ensured to be horizontal to facilitate the installation of the bottom longitudinal beam;
step 6, bottom die, outer die, guide beam and protection, wherein the bottom die 3-2 consists of a bottom die 3-2 front lower cross beam, a bottom die rear lower cross beam, longitudinal beams and panels, the cross beams are connected through the longitudinal beams, and the panels are laid on the longitudinal beams; after the bottom die is assembled under the bridge, the bottom die is hoisted in place by using a truck crane, the width of the panel is 6-8 mm narrower than the bottom of the box girder, and double-sided adhesive tapes with the width of 5-7 mm are pasted on the edges of two sides, so that slurry leakage at the joint of the side die and the bottom plate during concrete pouring is prevented;
the side die adopts a customized steel template, a shaped steel framework is welded on the outer side of the template for reinforcement, a guide beam penetrates into a truss of the outer side die after the outer side die is assembled under a bridge, the side die is supported on the guide beam of the outer die, the rear end of the side die is suspended on a top plate of a poured box girder through a hanging strip, a bearing hanging frame and a sliding hanging frame are arranged between the rear hanging strip and the guide beam, the sliding hanging frame is provided with a rolling shaft, and when a hanging basket travels, the guide beam of the outer side die and the side die move along the sliding hanging frame together;
the front and rear cross beam platforms of the bottom basket and the front and upper cross beam platforms of the hanging basket are supported by platform supports which are connected to the cross beams through bolts, the two sides of the platform walking plate and the platform supports are fixed through spot welding and welded to be 5mm high, the front and rear cross beams of the bottom basket are communicated through the lateral platform of the bottom basket, the lateral platform of the bottom basket and the cross beams of the bottom basket are fixed through off-welding, the welded height is 6mm, the length of a welding line is 75mm, and the distance between the lateral platform of the bottom basket and the cross beams of;
the main truss system comprises two parts, namely a crawling ladder and a walking channel, wherein one end of the walking channel is connected with the side edge of the walking plate of the upper cross beam of the front suspension basket by adopting a bolt, and the other end of the walking channel is erected on the upper chord of the parallel truss and fixed by adopting spot welding and then communicated with the ground through the vertical crawling ladder;
step 7, cantilever construction
① pre-pressing hanging basket
Before prepressing, checking and confirming whether each anchor and a suspender of the cradle are correctly installed, fastening the stressed suspender of the rear anchor system, particularly the suspender of the rear pressing system and the suspender of the front beam system, enabling each suspender to be evenly stressed, and carrying out cradle prepressing test after confirming correct installation.
② construction of beam section
Adjusting the bottom die 3-2 to the designed elevation, binding bottom web steel bars, installing prestressed pipelines, installing an inner die, and binding top plate steel bars and prestressed pipelines. And confirming that the rod pieces, the suspension rods and the rear anchors are arranged behind the positions, and pouring concrete on the beam sections. When pouring, the beam section concrete needs to be symmetrically poured, and the unbalanced weight of the two sides is not more than the design requirement.
③ demoulding of hanging basket
Removing the internal mold after the concrete of the beam section reaches 70% of the design strength, wherein the concrete of the beam section reaches 95% of the design strength, the elastic modulus reaches 100% of the design value, and the internal mold can be tensioned when the age is not less than 5 days; and (4) removing the bottom die after tensioning and grouting.
Adjusting a front suspender of the outer guide beam and a suspender jack of the hanger to enable the side mold and the outer guide beam 2-1 to stably descend by means of self gravity until the guide beam falls on the guide beam sliding frame;
step 8, lengthening a Bailey main truss, namely firstly placing an I45b steel pad beam on a bridge deck, hoisting a Bailey beam combined truss assembled in advance by using an automobile crane, anchoring the Bailey truss on a beam body by using a compression beam sleeper through a vertical finish rolling deformed steel bar in a lengthened web plate and a compression beam to anchor the Bailey main truss, and pinning and installing a cross brace by using a Bailey pin; finally, all rear anchor systems are tightened step by using 2 jacks of 30 t;
and 9, installing a hanging basket traction device, moving the hanging basket forward, arranging a stressed baffle at the foremost end of the lengthened Bailey beam truss, and adopting a center-penetrating jack or a chain block to uniformly pull the template system to move forward.
The invention has the beneficial effects that: the design method of the upper traveling system of the assembled Bailey beam hanging basket is reasonable in design:
1, the walking system is arranged at the upper part of the main truss, is safer than a walking rail which is reversely buckled, has low risk coefficient and can be widely popularized;
2, the walking system replaces walking rails with main trusses, the slide way adopts conventional channel steel, independent processing is not needed, materials can be recycled, and cost is saved;
3 the assembled Bailey beam hanging basket saves the construction cost and creates good benefits for the society.
Drawings
FIG. 1 is a schematic cross-sectional structure of the present invention;
FIG. 2 is a schematic diagram of the structure of the vertical section of the present invention.
In the figure: 1. the main truss structure comprises a main truss system, 2, an outer guide beam system, 3, a formwork system, 4, an anchoring system, 5, a walking system, 1-1, parallel trusses, 1-2, cross beams, 1-3, a connecting system, 2-1, outer guide beams, 2-2, hanging rods, 3-1, side molds, 3-2, bottom molds, 3-3, inner molds, 4-1, anchoring beams, 4-2, hanging strips, 5-1 and slideways.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the assembled bailey beam hanging basket upper traveling system comprises a hanging basket, wherein the hanging basket comprises a main truss system 1, an outer guide beam system 2, a template system 3, an anchoring system 4 and a traveling system 5, the main truss system 1 is a main stress structure of the hanging basket, the outer guide beam system 2 is used for supporting the weight of a side mold 3-1 of the template system 3, the anchoring system 4 anchors the anchoring beam 4-1 to a poured beam body through a reserved hole, and the traveling system 5 is arranged above a parallel truss 1-1 of the main truss system 1.
Further, in the embodiment of the present invention, the main truss system 1 is composed of parallel trusses 1-1, beams 1-2 and connecting systems 1-3, the parallel trusses 1-1 are assembled by three beret beams, the beams 1-2 include front beams and rear beams, a group of front beams and a group of rear beams are arranged at the front ends of the parallel trusses 1-1, two groups of anchoring beams 4-1 are arranged at the tail ends of the parallel trusses 1-1, the parallel trusses 1-1 are arranged in two groups, and the parallel trusses 1-1 are connected by the connecting systems 1-3 of the front beams 1-2 and the rear beams 1-2.
Further, in the embodiment of the invention, the outer guide beam system 2 is composed of an outer guide beam 2-1 and a suspension rod 2-2, wherein the front end of the outer guide beam 2-1 is suspended on the front cross beam of the cross beam 1-2 through the suspension rod 2-2, and the tail end is suspended on the flange of the poured beam body.
Further, in the embodiment of the invention, the formwork system 3 is composed of a side die 3-1, a bottom die 3-2 and an inner die 3-3, the side die 3-1 and the bottom die 3-2 form an outer die of the formwork system 3, the inner die 3-3 is arranged on the inner sides of the side die 3-1 and the bottom die 3-2, the inner die 3-3 is connected with the outer guide beam 2-1, the side die 3-1 adopts a large-area steel die, the bottom die 3-2 adopts a truss type steel framework, and the inner die 3-3 adopts a wood die, so that the formwork has good overall performance, high rigidity and good appearance quality of concrete, the inner die adopts a wood die, and the construction cost is low and the construction is easy.
Further, in the embodiment of the invention, the anchoring system 4 comprises an anchoring beam 4-1 and a hanging strip 4-2, the anchoring beam 4-1 is anchored on the poured beam body through a preformed hole, and the hanging strip 4-2 is connected to two ends of the anchoring beam 4-1, so that overturning counter force can be transmitted to the poured beam body.
Further, in the embodiment of the invention, the walking system 5 comprises a slideway 5-1, the slideway 5-1 is arranged above the parallel truss 1-1 of the main truss system 1, the slideway 5-1 is reversely buckled on the parallel truss 1-1 formed by the Bailey beams by adopting six channel steels, the connection part is coated with grease, the hanging basket can be conveniently pulled to move forwards or backwards through a traction device, the risk of overturning is avoided, and the construction safety is ensured.
A design construction method of an upper traveling system of an assembled Bailey beam hanging basket comprises the following steps:
and 2, installing the Bailey truss, the rear anchor beam and the pressing beam, wherein the Bailey truss can be integrally hoisted to the bridge floor after being spliced on the ground according to the hoisting capacity of an on-site crane, and each rod piece can also be hoisted to the bridge floor in a piece-by-piece mode for splicing, when an integral hoisting mode is adopted, a mark is made on the main truss before hoisting, and each component is required to be installed without errors and omission, so that the main truss system 1 is formed.
After the Bailey truss is placed, checking whether the distance between the front ends of the parallel trusses 1-1 meets the conditions of construction of a suspended casting section and forward movement of a hanging basket; after the situation that no errors exist, the Bailey main truss is fixed by two 3T chain blocks respectively to prevent people from being injured by dumping, then the Bailey truss is anchored on the cross beam 1-2 by the vertical prestress finish rolling deformed steel bar in the lengthened web plate through the beam pressing sleeper, the Bailey truss needs to be strictly ensured to be horizontal longitudinally and transversely when being anchored, if deviations exist, the steel plate can be used for leveling adjustment, and the center distance of the Bailey truss is strictly controlled to be consistent with the design; when the front supporting point of the main truss is not provided with a vertical upright rod, a vertical reinforcing rod needs to be added for reinforcement, a rear anchor carrying pole beam and a rear anchor hanging rod are placed and tightly tied by 2 screw jacks of 30t, 2 main trusses are respectively anchored on the beam surface, and the front end of each main truss is provided with a cross brace;
and 3, installing a slideway of the walking system, measuring the positions of the front upper crossbeam and the rear upper crossbeam of the crossbeam 1-2 before installing the slideway 5-1, and controlling the length of the slideway 5-1 to be respectively longer than the positions of the front upper crossbeam and the rear upper crossbeam by 50 cm. Then coating butter on the Bailey truss, and processing the front end and the rear end of the slideway into a splayed shape in advance to prevent the slideway from being propped by the Bailey pin and being incapable of moving forwards or retreating in the forward and retreating processes of the hanging basket; 6 slideways are designed for the single T-shaped structure, each slideway is 6m long, 1 22 channel steel is lifted by the crane each time during installation, the channel steel is reversely buckled at the top of the Bailey truss, and the slideways are required to be prevented from deforming and twisting during hoisting and installation so as to avoid increasing forward and backward resistance of the hanging basket;
step 4, mounting the front upper cross beam and the rear upper cross beam, wherein the front upper cross beam and the rear upper cross beam are respectively made of I32B steel and I25B steel, the middle point of the cross beam is overlapped with the central line of the bridge and is placed above the slideway 5-1, the front upper cross beam and the rear upper cross beam are firmly welded with the slideway 5-1, and the front upper cross beam and the rear upper cross beam are transversely welded into a whole by adopting square steel;
step 5, mounting hanging strips, a lower cross beam and a bottom longitudinal beam, wherein the front upper cross beam is provided with 6 hanging strips 4-2, 4 hanging bottom moulds 3-2 and 2 hanging outer side moulds 3-1; the rear cross beam is provided with 2 hanging straps 4-2, the rear lower cross beam is hung so that the hanging basket can move forwards or backwards to walk with a mould, the rear lower cross beam is additionally provided with 2 short hanging straps anchored at a position of a concrete preformed hole cast at the bottom of the beam, before the hanging straps 4-2 are installed, a flat gasket is placed at the upper end of finish-rolled deformed steel bar, finally two nuts are installed, the lower part of the flat gasket is fixed by the hanging straps 4-2, after the truck crane is lifted, the truck crane is vertically placed in place through the preformed holes of the front upper cross beam and the rear upper cross beam, the end parts of the front upper cross beam and the rear upper cross beam are respectively provided with 4 inverted chain hoists of 1 t.
When the lower cross beam is installed, the lower cross beam is slightly lower than the poured beam bottom concrete surface by 50-70 cm, the rear lower cross beam is temporarily fixed by a 10t chain block and a phi 25 steel wire rope on the rear upper cross beam, a lifting sling 4-2 passes through a preformed hole to anchor the rear lower cross beam, the front lower cross beam and the rear lower cross beam are installed identically, and the front lower cross beam and the rear lower cross beam are ensured to be horizontal to facilitate the installation of the bottom longitudinal beam;
step 6, bottom die, outer die, guide beam and protection, wherein the bottom die 3-2 consists of a bottom die 3-2 front lower cross beam, a bottom die 3-2 rear lower cross beam, longitudinal beams and panels, the cross beams 1-2 are connected through the longitudinal beams, and the panels are laid on the longitudinal beams; and after the bottom die 3-2 is assembled under the bridge, the bottom die is hoisted in place by using a truck crane, the width of the panel is 6-8 mm narrower than the bottom of the box girder, and double-sided adhesive tapes with the width of 5-7 mm are pasted on the edges of two sides, so that slurry leakage at the joint of the side die and the bottom plate during concrete pouring is prevented.
The side die 3-1 is made of a customized steel template, a shaped steel framework is welded on the outer side of the template for reinforcement, a guide beam penetrates into a truss of the outer side die after the outer side die is assembled under a bridge, the side die 3-1 is supported on the guide beam of the outer die, the rear end of the side die is suspended on a top plate of a poured box girder through a hanging strip, a bearing hanging bracket and a sliding hanging bracket are arranged between the rear hanging strip and the guide beam, the sliding hanging bracket is provided with a rolling shaft, and when the hanging basket travels, the guide beam of the outer side die and the side die 3-1 move along the sliding hanging bracket.
Preceding, rear frame member platform of end basket and hang preceding entablature platform of basket are through adopting the platform support bearing of bolted connection on the crossbeam, and it is fixed all to adopt spot welding between platform walking board both sides and the platform support, welds high 5mm, and through end basket lateral platform intercommunication between preceding, the rear frame member of end basket, adoption is disconnected to weld between end basket lateral platform and the end basket crossbeam and is connected fixedly, welds high 6mm, weld length 75mm, interval 100 mm.
The main truss system 1 comprises two parts, namely a ladder stand and a walking channel, wherein one end of the walking channel is connected with the side edge of a walking plate of a front upper cross beam of the hanging basket by adopting a bolt, and the other end of the walking channel is erected on an upper chord of the parallel truss 1-1 and fixed by adopting spot welding and then communicated with the ground through the vertical ladder stand;
step 7, cantilever construction
① pre-pressing hanging basket
Before prepressing, checking and confirming whether each anchor and a suspender of the cradle are correctly installed, fastening the stressed suspender of the rear anchor system, particularly the suspender of the rear pressing system and the suspender of the front beam system, enabling each suspender to be evenly stressed, and carrying out cradle prepressing test after confirming correct installation.
② construction of beam section
Adjusting the bottom die 3-2 to a designed elevation, binding bottom web steel bars and installing prestressed pipelines, installing the inner die 3-3, and binding top plate steel bars and prestressed pipelines. And confirming that each rod piece, the suspender 2-2 and the rear anchor are arranged behind the position, and pouring concrete on the beam section. When pouring, the beam section concrete needs to be symmetrically poured, and the unbalanced weight of the two sides is not more than the design requirement.
③ demoulding of hanging basket
Removing the internal molds 3-3 after the beam section concrete reaches 70% of the design strength, wherein the beam section concrete reaches 95% of the design strength, the elastic modulus reaches 100% of the design value, and the tensile property can be realized when the age is not less than 5 days; and (3) removing the bottom die by 3-2 after tensioning and grouting.
Adjusting a front suspender 2-2 and a hanger suspender jack of the outer guide beam 2-1 to enable the side mold 3-1 and the outer guide beam 2-1 to stably descend by means of self gravity until the guide beam falls on the guide beam sliding frame;
step 8, lengthening a Bailey main truss, namely firstly placing an I45b steel pad beam on a bridge deck, hoisting a Bailey beam combined truss assembled in advance by using an automobile crane, anchoring the Bailey truss on a beam body by using a compression beam sleeper through a vertical finish rolling deformed steel bar in a lengthened web plate and a compression beam to anchor the Bailey main truss, and pinning and installing a cross brace by using a Bailey pin; finally, all rear anchor systems are tightened step by using 2 jacks of 30 t;
and 9, installing a hanging basket traction device, moving the hanging basket forward, arranging a stressed baffle at the foremost end of the lengthened Bailey beam truss, and adopting a center-penetrating jack or a chain block to uniformly pull the template system to move forward.
The working principle is as follows: when the design method of the upper walking system of the assembled Bailey beam hanging basket is used, the walking system 5 of the hanging basket adopts an assembled Bailey truss to replace a walking rail, 22 channel steel is reversely buckled at the top of the Bailey beam to serve as a slideway and a transverse limiting device, and the upper front and rear beams of the beam 1-2 and the channel steel of the slideway 5-1 are welded into a whole. Meanwhile, in order to ensure the stability of the cantilever system, the two assembled Bailey sheet main trusses are transversely connected and reinforced by the cross braces, and the upper front and rear cross beams are welded into a whole by rectangular pipes. The template system 3 is locked on the beam block section to be cast through the suspension rods 2-2 on the front and rear cross beams. The Bailey main truss is lengthened by adopting a hoisting method, a hanging basket template system moves forwards, 6 channels of 22 channel steel are respectively arranged at the top of the Bailey beam of the main truss, butter is smeared to serve as a slideway 5-1, a fixed point is arranged at the front end of the main truss beam, and a front clamping type jack or a chain block is used for dragging the forward hanging basket.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a walk system on assembled bailey roof beam string basket, includes and hangs the basket, its characterized in that: the hanging basket comprises a main truss system (1), an outer guide beam system (2), a template system (3), an anchoring system (4) and a walking system (5), wherein the main truss system (1) is a main stress structure of the hanging basket, the outer guide beam system (2) is used for supporting the weight of a side mold (3-1) of the template system (3), the anchoring system (4) anchors the anchoring beam (4-1) to a poured beam body through a reserved hole, and the walking system (5) is arranged above a parallel truss (1-1) of the main truss system (1).
2. The assembled Bailey beam hanging basket up-running system according to claim 1, wherein: the main truss system (1) is composed of parallel trusses (1-1), cross beams (1-2) and connecting systems (1-3), the parallel trusses (1-1) are formed by assembling three Bailey beams, the cross beams (1-2) comprise front cross beams and rear cross beams, a group of front cross beams and a group of rear cross beams are arranged at the front ends of the parallel trusses (1-1), two groups of anchoring beams (4-1) are arranged at the tail parts of the parallel trusses (1-1), and the parallel trusses (1-1) are connected through the connecting systems (1-3) of the front cross beams and the rear cross beams (1-2).
3. The assembled Bailey beam hanging basket up-running system according to claim 1 or 2, wherein: the outer guide beam system (2) is composed of an outer guide beam (2-1) and a suspension rod (2-2), the front end of the outer guide beam (2-1) is suspended on a front cross beam of the cross beam (1-2) through the suspension rod (2-2), and the tail end of the outer guide beam is suspended on a cast beam body flange.
4. The assembled Bailey beam hanging basket up-running system according to claim 3, wherein: template system (3) comprise side form (3-1), die block (3-2) and centre form (3-3), side form (3-1) constitutes the external mold of template system (3) with die block (3-2), centre form (3-3) set up the inboard at side form (3-1) and die block (3-2), just centre form (3-3) are connected with outer nose girder (2-1), side form (3-1) adopt the large face steel mould, truss-like steel skeleton is adopted in die block (3-2), centre form (3-3) adopt the wood mould.
5. The assembled Bailey beam hanging basket up-running system according to claim 1, wherein: the anchoring system (4) comprises an anchoring beam (4-1) and a hanging strip (4-2), the anchoring beam (4-1) is anchored on a poured beam body through a preformed hole, and the hanging strip (4-2) is connected to two ends of the anchoring beam (4-1).
6. The assembled Bailey beam hanging basket up-running system according to claim 1, wherein: the walking system (5) comprises a slide way (5-1), the slide way (5-1) is arranged above a parallel truss (1-1) of the main truss system (1), the slide way (5-1) adopts six channel steel to be reversely buckled on the parallel truss (1-1) formed by the Bailey beams, and the joint is coated with grease.
7. A design construction method of an upper traveling system of an assembled Bailey beam hanging basket is characterized by comprising the following steps:
step 1, mounting sleepers, namely leveling the lower sleeper beam position of a main truss on a constructed beam section by using high-strength cement mortar, paying attention to the fact that the front strut position of the bearing main truss is double-spliced 45b I-steel in the leveling process, taking a line central line as a reference, referring to a hanging basket splicing diagram, giving out the line central line to find the central position of a Bailey truss, laying the sleepers according to a drawing, and laying the sleepers at intervals along the bridge direction according to the vertical upright positions of the Bailey truss;
step 2, installing the Bailey truss, the rear anchor beam and the pressing beam, wherein the Bailey truss can be integrally hoisted to a bridge floor after being spliced on the ground according to the hoisting capacity of a field crane, and each rod piece can also be hoisted to the bridge floor in a split manner for splicing;
after the Bailey truss is placed, checking whether the distance between the front ends of the parallel trusses (1-1) meets the conditions of construction of a suspended casting section and forward movement of a hanging basket; after the situation that no errors exist, the Bailey main truss is fixed by two 3T chain blocks respectively to prevent people from being injured by dumping, then the Bailey truss is anchored on the cross beam (1-2) by the vertical prestress finish rolling deformed steel bar in the lengthened web plate through the compression beam, the Bailey truss needs to be strictly ensured to be horizontal longitudinally and transversely when being anchored, if deviations exist, the steel plate can be used for leveling adjustment, and the center distance of the Bailey truss is strictly controlled to be consistent with the design; when the front supporting point of the main truss is not provided with a vertical upright rod, a vertical reinforcing rod needs to be added for reinforcement, a rear anchor carrying pole beam and a rear anchor hanging rod are placed and tightly tied by 2 screw jacks of 30t, 2 main trusses are respectively anchored on the beam surface, and the front end of each main truss is provided with a cross brace;
and step 3, installing a slideway of the walking system, respectively measuring the positions of the front upper crossbeam and the rear upper crossbeam of the crossbeam (1-2) before installing the slideway (5-1), and controlling the length of the slideway (5-1) to be respectively longer than the positions of the front upper crossbeam and the rear upper crossbeam by 50 cm. Then coating butter on the Bailey truss, and processing the front end and the rear end of the slideway into a splayed shape in advance to prevent the slideway from being propped by the Bailey pin and being incapable of moving forwards or retreating in the forward and retreating processes of the hanging basket; 6 slideways are designed for the single T-shaped structure, each slideway is 6m long, and a crane starts 1 channel steel 22 each time during installation so as to enable the channel steel to be reversely buckled at the top of the Bailey truss;
step 4, mounting the front upper cross beam and the rear upper cross beam, wherein the front upper cross beam and the rear upper cross beam are respectively made of I32B steel and I25B steel, the middle point of the cross beam is overlapped with the central line of the bridge and is placed above the slideway (5-1), the front upper cross beam and the rear upper cross beam are firmly welded with the slideway (5-1) and are welded into a whole by square steel;
step 5, mounting hanging strips, a lower cross beam and a bottom longitudinal beam, wherein the front upper cross beam is provided with 6 hanging strips (4-2), 4 hanging bottom dies (3-2) and 2 hanging outer dies (3-1); 2 hanging belts (4-2) are arranged on the rear cross beam, the rear lower cross beam is hung so that the hanging basket can move forwards or backwards to walk with a mould, 2 short hanging belts are additionally designed on the rear lower cross beam and anchored at a position of a concrete preformed hole cast at the bottom of the beam, before the hanging belts (4-2) are installed, a flat gasket is placed at the upper end of finish-rolled deformed steel bar, two nuts are installed at the last, the lower part of the flat gasket is fixed by a hoisting (4-2) belt, after being hoisted by a truck, the truck is vertically lowered in place through the preformed holes of the front upper cross beam and the rear upper cross beam, 1 chain block with 10t is arranged at the end part of the front upper cross beam;
when the lower cross beam is installed, the lower cross beam is slightly lower than the poured beam bottom concrete surface by 50-70 cm, the rear lower cross beam is temporarily fixed by a 10t chain block and a phi 25 steel wire rope on the rear upper cross beam, a lifting sling (4-2) passes through a preformed hole to anchor the rear lower cross beam, the front lower cross beam and the rear lower cross beam are installed identically, and the front lower cross beam and the rear lower cross beam are ensured to be horizontal to facilitate the installation of the bottom longitudinal beam;
step 6, bottom die, outer die, guide beam and protection, wherein the bottom die (3-2) consists of a bottom die (3-2) front lower cross beam, a bottom die (3-2) rear lower cross beam, longitudinal beams and panels, the cross beams (1-2) are connected through the longitudinal beams, and the panels are laid on the longitudinal beams; the bottom die (3-2) is assembled under the bridge and then hoisted in place by a truck crane, the width of the panel is 6-8 mm narrower than the bottom of the box girder, and double-sided adhesive tapes with the thickness of 5-7 mm are pasted on the edges of two sides, so that slurry leakage at the joint of the side die and the bottom plate during concrete pouring is prevented;
the side die (3-1) adopts a customized steel template, a shaped steel framework is welded on the outer side of the template for reinforcement, a guide beam penetrates into the outer side die truss after the outer side die is assembled under a bridge, the side die (3-1) is supported on the outer die guide beam, the rear end of the side die is suspended on a top plate of a poured box girder through a hanging strip, a bearing hanging frame and a sliding hanging frame are arranged between the rear hanging strip and the guide beam, the sliding hanging frame is provided with a rolling shaft, and when the hanging basket travels, the outer side die guide beam and the side die (3-1) move along the sliding hanging frame;
the front and rear cross beam platforms of the bottom basket and the front and upper cross beam platforms of the hanging basket are supported by platform supports which are connected to the cross beams through bolts, the two sides of the platform walking plate and the platform supports are fixed through spot welding and welded to be 5mm high, the front and rear cross beams of the bottom basket are communicated through the lateral platform of the bottom basket, the lateral platform of the bottom basket and the cross beams of the bottom basket are fixed through off-welding, the welded height is 6mm, the length of a welding line is 75mm, and the distance between the lateral platform of the bottom basket and the cross beams of;
the main truss system (1) comprises a crawling ladder and a walking channel, wherein one end of the walking channel is connected with the side edge of a walking plate of the upper cross beam in front of the hanging basket by bolts, and the other end of the walking channel is erected on the upper chord of the parallel truss (1-1) and fixed by spot welding and then communicated with the ground through the vertical crawling ladder;
step 7, cantilever construction
① basket preload
Before prepressing, checking and confirming whether each anchor and a suspender of the cradle are correctly installed, fastening a stressed suspender of a rear anchor system, particularly the suspenders of a rear pressing system and a front beam system, enabling each suspender to be uniformly stressed, and performing cradle prepressing test after confirming correct installation;
② construction of beam section
Adjusting the bottom die (3-2) to a designed elevation, binding bottom web steel bars and installing prestressed pipelines, installing the inner die (3-3), and binding top plate steel bars and prestressed pipelines. And confirming that each rod piece, the suspender (2-2) and the rear anchor are arranged behind the position, and pouring concrete into the beam section. When pouring, the beam section concrete needs to be symmetrically poured, and the unbalanced weight of the two sides is not more than the design requirement;
③ demoulding of hanging basket
Removing the internal mold (3-3) after the concrete of the beam section reaches 70% of the design strength, wherein the concrete of the beam section reaches 95% of the design strength, the elastic modulus reaches 100% of the design value, and the internal mold can be tensioned when the age is not less than 5 days; the bottom die (3-2) can be removed after tensioning and grouting;
adjusting a front suspender (2-2) and a suspender jack of the outer guide beam (2-1) to enable the side mold (3-1) and the outer guide beam (2-1) to stably descend by means of self gravity until the guide beam falls on the guide beam sliding frame;
step 8, lengthening the Bailey main truss, namely firstly placing an I45b steel pad beam on a bridge deck, hoisting the Bailey beam combined truss assembled in advance by using an automobile crane, anchoring the Bailey truss on a beam body by using a compression beam (sleeper) through pre-embedding finish rolling deformed steel bars on a web plate in advance, anchoring the Bailey main truss by using the compression beam, and pinning and installing a cross brace by using a Bailey pin; finally, all rear anchor systems are tightened step by using 2 jacks of 30 t;
and 9, installing a hanging basket traction device, moving the hanging basket forward, arranging a stressed baffle at the foremost end of the lengthened Bailey beam truss, and adopting a center-penetrating jack or a chain block to uniformly pull the template system to move forward.
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