CN110700119B - Design construction method of walking system on assembled bailey beam hanging basket - Google Patents
Design construction method of walking system on assembled bailey beam hanging basket Download PDFInfo
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- CN110700119B CN110700119B CN201910710779.9A CN201910710779A CN110700119B CN 110700119 B CN110700119 B CN 110700119B CN 201910710779 A CN201910710779 A CN 201910710779A CN 110700119 B CN110700119 B CN 110700119B
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- 238000010276 construction Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000009286 beneficial effect Effects 0.000 claims abstract description 5
- 238000004873 anchoring Methods 0.000 claims description 33
- 238000003466 welding Methods 0.000 claims description 18
- 241001669679 Eleotris Species 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 235000014121 butter Nutrition 0.000 claims description 7
- 230000009193 crawling Effects 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 4
- 239000002023 wood Substances 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an assembled type bailey beam hanging basket upward traveling system and a design method thereof. The beneficial effects of the invention are as follows: the walking system is arranged at the upper part of the main truss, is safer than the walking system which is reversely buckled on the walking track, has low risk coefficient and can be widely popularized; the walking system utilizes the main truss to replace a walking rail, the slideway 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 cradle running system, in particular to an assembled bailey beam cradle upper running system and a design construction method thereof, and belongs to the technical field of urban bridge engineering.
Background
The bridge of the station section of train entering and exiting is divided into double lines and single lines, the existing road is in cantilever casting construction, because the weight of the single line beam cantilever casting block section does not meet the requirement of the conventional basket, the assembled bailey beam basket is specially designed, and the bailey beam assembled basket cast-in-situ box girder is a construction method for symmetrically constructing the bridge girder body along the bridge line direction by taking the cantilever basket as an operation platform on the basis of post-tensioning prestress construction technology.
The tail of the hanging basket is anchored on the poured beam section by PSB830 finish rolling screw steel, the cantilever at the front end extends outwards, and the bottom die truss and the side die truss are lifted by the front suspender and the rear suspender below the cantilever, so that a supporting platform is provided for the hanging beam. The cast-in-situ girder body is constructed in sections, the girder body structure is utilized to bear all loads in the construction process, the traditional running system for assembling the bailey truss mostly adopts a mode that a track is paved on a girder surface and a reverse buckling wheel is additionally arranged, the operation is not easy, great potential safety hazards exist, and the overturning risk exists in the forward and backward processes of the cradle.
Disclosure of Invention
The invention aims to solve the problems and provide an assembled bailey beam hanging basket upward traveling system and a design method thereof.
The invention realizes the above purpose through the following technical scheme: the utility model provides an assembled bailey beam hangs basket and goes up traveling system, includes and hangs the basket, it includes main truss system, outer nose girder system, template system, anchor system and traveling 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 is through the preformed hole with the anchor roof beam anchor at the beam body of having been pour, traveling system sets up in main truss system's parallel truss top.
As a further scheme of the invention: the main truss system is composed of parallel trusses, cross beams and a coupling system, the parallel trusses are formed by splicing three Bailey beams, each cross beam comprises a front cross beam and a rear cross beam, the front end of each parallel truss is provided with a group of front cross beams and a group of rear cross beams, the tail of each parallel truss is provided with two groups of anchoring beams, and the parallel trusses are connected through the coupling system of the front cross beams and the rear cross beams.
As a further scheme of the invention: the outer guide beam system consists of an outer guide beam and a suspender, wherein the front end of the outer guide beam is suspended on the front cross beam of the cross beam through the suspender, and the tail is suspended on the poured beam body flange.
As a further scheme of the invention: the template system comprises a side die, a bottom die and an inner die, wherein the side die and the bottom die form an outer die of the template system, the inner die is arranged on the inner sides of the side die and the bottom die and is connected with the outer guide beam, the side die adopts a large-surface steel die, the bottom die adopts a truss type steel skeleton, and the inner die adopts a wood die.
As a further scheme of the invention: the anchoring system comprises an anchoring beam and hanging strips, wherein the anchoring beam is anchored on a poured beam body through a reserved hole, and the hanging strips are connected to two ends of the anchoring beam.
As a further scheme of the invention: the walking system comprises a slideway, the slideway is arranged above a parallel truss of the main truss system, six channel steel is adopted for the slideway to be reversely buckled on the parallel truss formed by the bailey beams, and butter is smeared at the joint.
The design method of the walking system on the assembled bailey beam hanging basket comprises the following steps:
Step 1, sleeper installation, namely leveling the lower sleeper beam position of a main truss on a beam section with construction completion by using high-strength cement mortar, paying attention to the fact that the front supporting point position of a bearing main truss is double-spliced 45b I-steel in the leveling process, taking a line central line as a reference, referencing a hanging basket assembly drawing, paying out the line central line to find the central position of the Bailey truss, paving sleeper beams according to the drawing, and arranging the sleeper beams along the bridge direction interval according to the vertical upright position of the Bailey truss;
step 2, mounting the bailey truss, the rear anchor beam and the pressing beam, wherein the bailey truss can be integrally lifted to a bridge deck on the ground according to the lifting capacity of a site crane, and each rod piece can be lifted to the bridge deck for assembly in a split way;
After the Bailey truss is placed, checking whether the distance between the front ends of the parallel trusses meets the condition of hanging casting section construction and hanging basket forward movement; after confirming that the error is avoided, respectively fixing the Bailey truss by using two 3T chain blocks to prevent people from being injured by dumping, then anchoring the Bailey truss on a cross beam by adopting vertical prestress finish rolling screw steel in an extension web plate through a pressing beam sleeper, strictly ensuring that the longitudinal direction and the transverse direction are horizontal when the Bailey truss is anchored, and adopting a steel plate to carry out leveling adjustment if deviation exists, and strictly controlling the center distance of the Bailey truss to be consistent with design; when the front supporting point of the main truss is not provided with a vertical upright rod, a vertical reinforcing rod is added for reinforcement, a rear anchor shoulder pole beam and a rear anchor suspender are placed, 2 30t screw jacks are used for tightening, 2 main trusses are respectively anchored on a beam surface, and a scissor support is arranged at the front end of the main truss;
And 3, installing a slideway of the travelling system, wherein the positions of the front upper cross beam and the rear upper cross beam of the cross beam are measured before the slideway is installed, and the lengths of the controlled slideway are respectively longer than 50cm. Then butter is smeared on the bailey truss, the front end and the rear end of the slideway are processed into splayed shapes in advance, and the slideway is prevented from being propped against by the bailey pin and cannot move forwards or backwards in the processes of moving forwards and backwards of the hanging basket; 6 slide ways are designed for a single T-shaped structure, each slide way is 6m long, and when the crane is installed, 1 channel steel 22 channels are started each time, so that the crane is reversely buckled at the top of the bailey truss;
Step 4, installing front and rear upper cross beams, wherein the front and rear upper cross beams are respectively made of I32B, I B-type steel, the middle points of the cross beams are coincident with the central line of the bridge, the cross beams are placed above the slide way, the front and rear upper cross beams are firmly welded with the slide way, and the front and rear upper cross beams are transversely welded into a whole by adopting square steel;
Step 5, installing hanging strips, a lower cross beam and a bottom longitudinal beam, wherein 6 hanging strips are arranged on the front upper cross beam, 4 hanging bottom dies and 2 hanging outer dies; 2 hanging strips are arranged on the rear cross beam, the rear lower cross beam is hung so as to enable a hanging basket to move forwards or backwards and walk with a mould, 2 short hanging strips are additionally designed on the rear lower cross beam and anchored at the position where a concrete reserved hole is poured at the bottom of the cross beam, a flat gasket is firstly placed at the upper end part of finish rolling threaded steel before the hanging strips are installed, two nuts are finally installed, the lower parts of the flat gaskets are fixed by hanging strips, the automobile is vertically placed in place through the reserved holes of the front upper cross beam and the rear upper cross beam after being hung, and 110 t chain blocks are respectively arranged at the end parts of the front upper cross beam and the rear upper cross beam, and the bottom die elevation is adjusted;
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 using 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 is installed identically with the rear lower cross beam, and the front lower cross beam and the rear lower cross beam are ensured to be horizontal when installed so as to be beneficial to the installation of the bottom longitudinal beam;
Step 6, a bottom die, an outer die, a guide beam and protection, wherein the bottom die 3-2 consists of a front lower cross beam of the bottom die 3-2, a rear lower cross beam of the bottom die, longitudinal beams and a panel, the cross beams are connected through the longitudinal beams, and the panel is paved on the longitudinal beams; the bottom die is hoisted in place by an automobile crane after being assembled under the bridge, the width of the panel is 6-8 mm narrower than the bottom of the box girder, and double-sided adhesive tapes of 5-7 mm are attached to the edges of the two sides, so that slurry leakage at the joint of the side die and the bottom plate during concrete pouring is prevented;
The side mould adopts a custom steel template, a fixed steel framework is welded on the outer side of the template for reinforcement, a guide beam penetrates into the truss of the outer side mould after the outer side mould is assembled under a bridge, the side mould is supported on the guide beam of the outer mould, the rear end of the side mould is suspended on a top plate of the 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, a rolling shaft is processed by the sliding hanging bracket, and the guide beam of the outer side mould and the side mould move along the sliding hanging bracket together when the hanging basket walks;
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 a platform bracket which is connected to the cross beam by bolts, spot welding is adopted between two sides of a walking plate of the platform and the platform bracket to fix the two sides, the welding height is 5mm, the front and rear cross beams of the bottom basket are communicated by a side platform of the bottom basket, the side platform of the bottom basket is connected and fixed with the cross beam of the bottom basket by broken welding, the welding height is 6mm, the welding length is 75mm, and the interval is 100mm;
The main truss system comprises a crawling ladder and a travelling channel, one end of the travelling channel is connected with the side edge of a travelling plate of the front upper cross beam of the hanging basket by adopting bolts, and the other end of the travelling channel is erected on an upper chord member of the parallel truss and fixed by adopting spot welding and then is communicated with the ground by the vertical crawling ladder;
Step 7, cantilever construction
① Hanging basket prepressing
Before pre-pressing, checking and confirming whether each anchorage of the hanging basket and the hanging rod are correctly installed, fastening the hanging rods of the rear anchorage system, particularly the hanging rods of the rear pressing system and the front beam system, so that each hanging rod is uniformly stressed, and after the correct installation, carrying out the hanging basket pre-pressing test.
② Beam section construction
Adjusting the bottom die 3-2 to the designed elevation, binding the bottom web steel bars, installing the prestressed pipeline, installing the inner die, and binding the top plate steel bars and the prestressed pipeline. And (3) confirming that each rod, each suspender and each rear anchor are installed in place and then carrying out the casting of the beam Duan Hunning. During casting, the beam Duan Hunning is required to be symmetrically cast in soil, and the unbalanced weight at two sides is not greater than the design requirement.
③ Hanging basket demoulding
Removing the internal mold 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 beam section concrete can be stretched after the age is not less than 5 days; and (5) stretching and grouting to remove the bottom die.
Adjusting the front boom of the outer guide beam and the boom jack of the hanger to enable the side die and the outer guide beam 2-1 to stably descend by means of self gravity until the guide beam falls on the guide beam carriage;
Step 8, lengthening the bailey main truss, firstly placing an I45 b-shaped steel pad beam on a bridge deck, hoisting the assembled bailey beam combined truss in advance by using an automobile crane, anchoring the bailey truss on a beam body by using a pressure beam sleeper through pre-embedding the fine-rolled deformed steel bars in a web plate, anchoring the bailey main truss by using a pressure beam, and mounting a scissor brace by using a bailey pin; finally, using 230 t jacks to tighten all the rear anchor systems step by step;
And 9, installing a hanging basket traction device, enabling the hanging basket to move forward, arranging a stress baffle at the forefront end of the extended bailey girder truss, and enabling the hanging basket to move forward in place by adopting a penetrating jack or a chain block constant-speed traction template system.
The beneficial effects of the invention are as follows: the design and construction method of the assembled bailey beam hanging basket upward traveling system is reasonable in design:
The walking system is arranged at the upper part of the main truss, is safer than the walking system which is reversely buckled on the walking track, has low risk coefficient and can be widely popularized;
2, the walking system utilizes the main truss to replace a walking rail, the slideway 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.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of the present invention in a vertical section.
In the figure: 1. the main truss system, 2, the outer guide beam system, 3, the template system, 4, the anchoring system, 5, the walking system, 1-1, the parallel truss, 1-2, the cross beam, 1-3, the connecting system, 2-1, the outer guide beam, 2-2, the suspender, 3-1, the side mold, 3-2, the bottom mold, 3-3, the inner mold, 4-1, the anchoring beam, 4-2, the suspender and 5-1 and the slideway.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, an assembled bailey beam hanging basket upward 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 die 3-1 of the template system 3, the anchoring system 4 anchors an anchor beam 4-1 on 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, cross beams 1-2 and a coupling system 1-3, the parallel trusses 1-1 are composed of three beret beams, the cross beams 1-2 include a front cross beam and a rear cross beam, the front end of the parallel trusses 1-1 is provided with a group of front cross beams and a group of rear cross beams, the tail part is provided with two groups of anchoring beams 4-1, the parallel trusses 1-1 are provided with two groups, and the parallel trusses 1-1 are coupled through the coupling system 1-3 of the front cross beam 1-2 and the rear cross beam.
Further, in the embodiment of the present invention, the outer girder system 2 is composed of an outer girder 2-1 and a boom 2-2, the front end of the outer girder 2-1 is suspended on the front beam of the beam 1-2 through the boom 2-2, and the tail is suspended on the poured beam body flange.
Further, in the embodiment of the invention, the template 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 template 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-surface steel die, the bottom die 3-2 adopts a truss type steel skeleton, and the inner die 3-3 adopts a wood die, so that the template has good overall performance, high rigidity and good appearance quality of concrete, the inner die adopts the wood die, and the construction cost is low and the construction is easy.
Further, in the embodiment of the present invention, the anchoring system 4 includes an anchoring beam 4-1 and a hanging strip 4-2, the anchoring beam 4-1 is anchored to the poured beam body through a reserved hole, and two ends of the anchoring beam 4-1 are connected with the hanging strip 4-2, so as to transmit the overturning reaction force to the poured beam body.
Furthermore, in the embodiment of the present invention, the running system 5 includes a slide 5-1, the slide 5-1 is disposed above the parallel truss 1-1 of the main truss system 1, the slide 5-1 is reversely fastened on the parallel truss 1-1 formed by the bailey beams by adopting six channel steels, and butter is smeared at the connection position, so that the pull of the hanging basket to move forward or backward can be facilitated by the traction device, the risk of overturning is avoided, and the construction safety is ensured.
The design method of the walking system on the assembled bailey beam hanging basket comprises the following steps:
Step 1, sleeper installation, namely leveling the lower sleeper beam position of a main truss on a beam section with construction completion by using high-strength cement mortar, paying attention to the fact that the front supporting point position of a bearing main truss is double-spliced 45b I-steel in the leveling process, taking a line central line as a reference, referencing a hanging basket assembly drawing, paying out the line central line to find the central position of the Bailey truss, laying the sleeper beams according to the drawing, laying the sleeper beams along the bridge direction interval according to the vertical upright rod position of the Bailey truss, and providing an operation space for conveniently binding and prestress tensioning the roof steel bars of a bridge by adopting the 45-step steel sleeper beams;
Step 2, mounting the bailey truss, the rear anchor beam and the pressing beam, wherein the bailey truss can be integrally lifted to a bridge deck after being spliced on the ground according to the lifting capacity of an on-site crane, and also can be split to hoist each rod piece to the bridge deck for splicing.
After the Bailey truss is placed, checking whether the distance of the front end of the parallel truss 1-1 meets the construction condition of the hanging casting section and the forward movement condition of the hanging basket; after confirming that the error is avoided, respectively fixing the Bailey main trusses by using two 3T chain blocks to prevent people from being injured by dumping, then anchoring the Bailey trusses on the cross beams 1-2 by adopting vertical prestress finish rolling screw steels in the extension webs through the girder pressing sleeper, strictly ensuring that the longitudinal direction and the transverse direction are horizontal when the Bailey trusses are anchored, and adopting steel plates to carry out leveling adjustment if the error exists, and strictly controlling the center distance of the Bailey trusses 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 is added for reinforcement, a rear anchor shoulder pole beam and a rear anchor suspender are placed, 2 30t screw jacks are used for tightening, 2 main trusses are respectively anchored on a beam surface, and a scissor support is arranged at the front end of the main truss;
Step 3, installing a slideway of the travelling system, wherein the positions of the front upper cross beam and the rear upper cross beam of the cross beam 1-2 are measured before the slideway 5-1 is installed, and the lengths of the slideway 5-1 are controlled to be respectively 50cm longer than the positions of the front upper cross beam and the rear upper cross beam. Then butter is smeared on the bailey truss, the front end and the rear end of the slideway are processed into splayed shapes in advance, and the slideway is prevented from being propped against by the bailey pin and cannot move forwards or backwards in the processes of moving forwards and backwards of the hanging basket; 6 slide ways are designed for a single T-shaped structure, each slide way is 6m long, and when the crane is installed, 1 channel steel 22 channels are started each time, so that the crane is reversely buckled at the top of the bailey truss, and the slide ways are required to be prevented from deforming and twisting in the lifting and installing processes, so that the forward moving and backward withdrawing resistance of the hanging basket is prevented from being increased;
Step 4, installing front and rear upper cross beams, wherein the front and rear upper cross beams are respectively made of I32B, I B section steel, the middle point of each cross beam is coincident with the central line of the bridge, the cross beam is placed above the slide way 5-1, the front and rear upper cross beams are firmly welded with the slide way 5-1, and the front and rear upper cross beams are welded into a whole by adopting square steel;
Step 5, installing 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 strips 4-2 are arranged on the rear cross beam, the rear lower cross beam is hung so that a hanging basket moves forwards or backwards and walks with a mould, 2 short hanging strips are additionally designed on the rear lower cross beam and anchored at the position where a concrete reserved hole is poured at the bottom of the cross beam, a flat gasket is firstly placed at the upper end part of finish rolling threaded steel before the hanging strips 4-2 are installed, two nuts are finally installed, the lower part of the flat gasket is fixed by using a hanging strip 4-2, the automobile is vertically placed in place through the reserved holes of the front upper cross beam and the rear upper cross beam after being hung, and 110 t chain blocks are respectively arranged at the end parts of the front upper cross beam and the rear upper cross beam, and the bottom die elevation is adjusted for use.
When the lower beam is installed, the lower beam is slightly lower than the poured beam bottom concrete surface by 50-70 cm, the rear lower beam is temporarily fixed by using a 10t chain block and a phi 25 steel wire rope on the rear upper beam, the lifting sling 4-2 passes through a preformed hole to anchor the rear lower beam, the front lower beam is installed the same as the rear lower beam, and the front lower beam is ensured to be horizontal when being installed so as to be beneficial to the installation of the bottom longitudinal beam;
step 6, a bottom die, an outer die, a guide beam and protection, wherein the bottom die 3-2 consists of a front lower cross beam of the bottom die 3-2, a rear lower cross beam of the bottom die 3-2, longitudinal beams and a panel, the cross beams 1-2 are connected through the longitudinal beams, and the panel is paved on the longitudinal beams; the bottom die 3-2 is hoisted in place by an automobile crane after being assembled under the bridge, the width of the panel is 6-8 mm narrower than the bottom of the box girder, and double faced adhesive tapes of 5-7 mm are attached to the edges of the two sides, so that slurry leakage at the joint of the side die and the bottom plate during concrete pouring is prevented.
The side mould 3-1 adopts a custom-made steel template, a fixed steel framework is welded on the outer side of the template for reinforcement, a guide beam penetrates into the outer mould truss after the outer mould is assembled under a bridge, the side mould 3-1 is supported on the guide beam of the outer mould, the rear end of the side mould is suspended on a top plate of the 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, a rolling shaft is machined by the sliding hanging bracket, and the guide beam of the outer mould and the side mould 3-1 move along the sliding hanging bracket together when the hanging basket walks.
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 the platform supports which are connected to the cross beam through bolts, spot welding is adopted between two sides of the platform walking plate and the platform supports to fix the two sides of the platform walking plate, the welding height is 5mm, the front and rear cross beams of the bottom basket are communicated through the side platforms of the bottom basket, the side platforms of the bottom basket are connected and fixed with the cross beam of the bottom basket through broken welding, the welding height is 6mm, the welding length is 75mm, and the distance is 100mm.
The main truss system 1 comprises a crawling ladder and a travelling channel, one end of the travelling channel is connected with the side edge of a travelling plate of a front upper cross beam of the hanging basket by adopting bolts, and the other end of the travelling channel is erected on an upper chord of the parallel truss 1-1 and fixed by adopting spot welding and then is communicated with the ground by the upright crawling ladder;
Step 7, cantilever construction
① Hanging basket prepressing
Before pre-pressing, checking and confirming whether each anchorage of the hanging basket and the hanging rod are correctly installed, fastening the hanging rods of the rear anchorage system, particularly the hanging rods of the rear pressing system and the front beam system, so that each hanging rod is uniformly stressed, and after the correct installation, carrying out the hanging basket pre-pressing test.
② Beam section construction
Adjusting the bottom die 3-2 to the designed elevation, binding bottom web steel bars, installing a prestressed pipeline, installing the inner die 3-3, and binding top plate steel bars and the prestressed pipeline. And (3) confirming that each rod piece, the suspender 2-2 and the rear anchor are installed in place and then carrying out the beam Duan Hunning pouring. During casting, the beam Duan Hunning is required to be symmetrically cast in soil, and the unbalanced weight at two sides is not greater than the design requirement.
③ Hanging basket demoulding
Removing the internal mold 3-3 after the beam section concrete reaches 70% of the design strength, wherein the beam Duan Hunning soil reaches 95% of the design strength, the elastic modulus reaches 100% of the design value, and the beam can be stretched after the age is not less than 5 days; and (3) stretching and grouting to remove the bottom die 3-2.
Adjusting the front suspender 2-2 of the outer guide beam 2-1 and the suspender jack of the suspending frame to enable the side mould 3-1 and the outer guide beam 2-1 to stably descend by means of self gravity until the guide beam falls on a guide beam sliding frame;
Step 8, lengthening the bailey main truss, firstly placing an I45 b-shaped steel pad beam on a bridge deck, hoisting the assembled bailey beam combined truss in advance by using an automobile crane, anchoring the bailey truss on a beam body by using a pressure beam sleeper through pre-embedding the fine-rolled deformed steel bars in a web plate, anchoring the bailey main truss by using a pressure beam, and mounting a scissor brace by using a bailey pin; finally, using 230 t jacks to tighten all the rear anchor systems step by step;
And 9, installing a hanging basket traction device, enabling the hanging basket to move forward, arranging a stress baffle at the forefront end of the extended bailey girder truss, and enabling the hanging basket to move forward in place by adopting a penetrating jack or a chain block constant-speed traction template system.
Working principle: when the design method of the walking system on the assembled bailey beam cradle is used, the walking system 5 of the cradle replaces a walking rail with an assembled bailey truss, the 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 cross beams of the cross beams 1-2 are welded with the channel steel of the slideway 5-1 into a whole. Meanwhile, in order to ensure the stability of the cantilever system, the two main trusses of the assembled bailey pieces are transversely connected and reinforced by adopting a scissor support, and the upper front cross beam and the lower cross beam are welded into a whole by adopting rectangular pipes. The template system 3 is locked on the beam body block section to be poured through the suspenders 2-2 on the front and rear beams. The bailey main truss is lengthened by adopting a hoisting method, a hanging basket template system moves forward, 6 channels of channel steel 22 are respectively arranged at the top of the main truss bailey beam and butter is smeared to serve as a slide way 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 pulling the hanging basket to move forward.
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 characteristics 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (1)
1. The design construction method of the walking system on the assembled bailey beam hanging basket is characterized by comprising the following steps of:
The assembled bailey beam hanging basket upward traveling system comprises a hanging basket; 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 running 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 die (3-1) of the template system (3), the anchoring system (4) anchors the anchoring beam (4-1) on a poured beam body through a reserved hole, and the running system (5) is arranged above a parallel truss (1-1) of the main truss system (1);
The main truss system (1) is composed of parallel trusses (1-1), cross beams (1-2) and a connecting system (1-3), wherein the parallel trusses (1-1) are formed by splicing 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, the parallel trusses (1-1) are provided with two groups, and the parallel trusses (1-1) are connected through the connecting system (1-3) of the front cross beams (1-2);
the outer guide beam system (2) consists of an outer guide beam (2-1) and a suspender (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 suspender (2-2), and the tail is suspended on a poured beam body flange;
The template 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 template system (3), the inner die (3-3) is arranged on the inner side 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-surface steel die, the bottom die (3-2) adopts a truss type steel skeleton, and the inner die (3-3) adopts a wood die;
The anchoring system (4) comprises an anchoring beam (4-1) and hanging strips (4-2), wherein the anchoring beam (4-1) is anchored on a poured beam body through a reserved hole, and the hanging strips (4-2) are connected to two ends of the anchoring beam (4-1);
the running system (5) comprises a slideway (5-1), the slideway (5-1) is arranged above a parallel truss (1-1) of the main truss system (1), the slideway (5-1) adopts six channel steels to be reversely buckled on the parallel truss (1-1) formed by the bailey beams, and butter is smeared at the joint;
The design method comprises the following steps:
Step 1, sleeper installation, namely leveling the lower sleeper beam position of a main truss on a beam section with construction completion by using high-strength cement mortar, paying attention to the fact that the front supporting point position of a bearing main truss is double-spliced 45b I-steel in the leveling process, taking a line central line as a reference, referencing a hanging basket assembly drawing, paying out the line central line to find the central position of the Bailey truss, paving sleeper beams according to the drawing, and arranging the sleeper beams along the bridge direction interval according to the vertical upright position of the Bailey truss;
Step 2, mounting the bailey truss, the rear anchor beam and the pressing beam, wherein the bailey truss can be integrally lifted to a bridge deck on the ground according to the lifting capacity of a site crane, and each rod piece can be lifted to the bridge deck for assembly in a split way;
After the Bailey truss is placed, checking whether the distance of the front end of the parallel truss (1-1) meets the construction condition of the hanging casting section and the forward movement condition of the hanging basket; after confirming that the error is avoided, respectively fixing the Bailey main trusses by using two 3T chain blocks to prevent people from being injured by dumping, then anchoring the Bailey trusses on the cross beam (1-2) by adopting vertical prestress finish rolling screw steel in the extension web through a pressing beam, strictly ensuring that the longitudinal direction and the transverse direction are horizontal when the Bailey trusses are anchored, and adopting steel plates to carry out leveling adjustment if the error exists, and strictly controlling the center distance of the Bailey trusses 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 is added for reinforcement, a rear anchor shoulder pole beam and a rear anchor suspender are placed, 230 t screw jacks are used for tightening, 2 main trusses are respectively anchored on a beam surface, and a scissor support is arranged at the front end of the main truss;
step 3, installing a slide way of a travelling system, wherein the positions of a front upper cross beam and a rear upper cross beam of a cross beam (1-2) are measured before the slide way (5-1) is installed, the lengths of the slide way (5-1) are controlled to be respectively longer than the positions of the front upper cross beam and the rear upper cross beam by 50cm, butter is smeared on a Bailey truss, the front end and the rear end of the slide way are processed into splayed shapes in advance, and the slide way is prevented from being propped against by the Bailey pin to be incapable of moving forwards or backwards in the processes of moving forwards and backwards of hanging baskets; 6 slide ways are designed for a single T-shaped structure, each slide way is 6m long, and when the crane is installed, 1 channel steel 22 channels are started each time, so that the crane is reversely buckled at the top of the bailey truss;
Step 4, installing front and rear upper cross beams, wherein the front and rear upper cross beams are respectively I32B, I B steel, the middle points of the cross beams are coincident with the central line of the bridge, the cross beams are placed above the slide way (5-1), the front and rear upper cross beams are firmly welded with the slide way (5-1), and the front and rear upper cross beams are welded into a whole by adopting square steel;
Step 5, installing 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 strips (4-2) are arranged on the rear cross beam, the rear lower cross beam is hung so as to facilitate the hanging basket to move forwards or backwards and walk with a mould, 2 short hanging strips are additionally designed on the rear lower cross beam and anchored at the position where a concrete reserved hole is poured at the bottom of the cross beam, a flat gasket is firstly placed at the upper end part of finish rolling screw steel before the hanging strips (4-2) are installed, two nuts are finally installed, the lower part of the flat gasket is fixed by the hanging strips (4-2), the automobile is vertically placed in place through the reserved holes of the front upper cross beam and the rear upper cross beam after being hung, 110 t chain block is respectively arranged at the end parts of the front upper cross beam and the rear upper cross beam, and the bottom die elevation is adjusted for use;
When the lower beam is installed, the lower beam is slightly lower than the poured beam bottom concrete surface by 50-70 cm, the rear lower beam is temporarily fixed by using a 10t chain block and a phi 25 steel wire rope on the rear upper beam, a lifting sling (4-2) passes through a reserved hole to anchor the rear lower beam, the front lower beam is installed the same as the rear lower beam, and the front lower beam and the rear lower beam are ensured to be horizontal when installed so as to be beneficial to the installation of a bottom longitudinal beam;
step 6, a bottom die, an outer die, guide beams and protection, wherein the bottom die (3-2) consists of a front lower cross beam of the bottom die (3-2), a rear lower cross beam of the bottom die (3-2), longitudinal beams and a panel, the cross beams (1-2) are connected through the longitudinal beams, and the panel is paved on the longitudinal beams; the bottom die (3-2) is hoisted in place by an automobile crane after being assembled under the bridge, the width of the panel is 6-8 mm narrower than the bottom of the box girder, and double faced adhesive tapes of 5-7 mm are attached to the edges of the two sides, so that slurry leakage at the joint of the side die and the bottom plate during concrete pouring is prevented;
The side mould (3-1) adopts a custom-made steel template, a fixed steel framework is welded on the outer side of the template for reinforcement, a guide beam penetrates into an outer mould truss after the outer mould is assembled under a bridge, the side mould (3-1) is supported on the guide beam of the outer mould, the rear end of the side mould is suspended on a top plate of the 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, a rolling shaft is machined by the sliding hanging bracket, and the guide beam of the outer mould and the side mould (3-1) move along the sliding hanging bracket together when the hanging basket walks;
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 a platform bracket which is connected to the cross beam by bolts, spot welding is adopted between two sides of a walking plate of the platform and the platform bracket to fix the two sides, the welding height is 5mm, the front and rear cross beams of the bottom basket are communicated by a side platform of the bottom basket, the side platform of the bottom basket is connected and fixed with the cross beam of the bottom basket by broken welding, the welding height is 6mm, the welding length is 75mm, and the interval is 100mm;
The main truss system (1) comprises a crawling ladder and a travelling channel, one end of the travelling channel is connected with the side edge of a travelling plate of the front upper cross beam of the hanging basket by adopting bolts, and the other end of the travelling channel is erected on an upper chord member of the parallel truss (1-1) and fixed by adopting spot welding and then is communicated with the ground by the vertical crawling ladder;
Step 7, cantilever construction
① Hanging basket prepressing
Before prepressing, checking and confirming whether each anchoring and hanging rod of the hanging basket are correctly installed, fastening the hanging rods stressed by the anchoring system to ensure that each hanging rod is uniformly stressed, and carrying out hanging basket prepressing test after confirming correct installation;
② Beam section construction
Adjusting the bottom die (3-2) to the designed elevation, binding bottom web steel bars and installing a pre-stressed pipeline, installing the inner die (3-3), binding top plate steel bars and the pre-stressed pipeline, confirming that each rod piece, each suspender (2-2) and each rear anchor are installed in place and then pouring the beam Duan Hunning with soil, wherein when pouring, the beam Duan Hunning is required to be symmetrically poured, and the unbalanced weight at two sides is not greater than the design requirement;
③ Hanging basket demoulding
Removing the internal mold (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 beam section concrete can be stretched in the age of not less than 5 days; stretching and grouting to obtain a bottom die (3-2);
Adjusting the front suspender (2-2) of the outer guide beam (2-1) and the suspender jack of the suspension bracket to enable the side die (3-1) and the outer guide beam (2-1) to stably descend by means of self gravity until the guide beam falls on a guide beam sliding frame;
step 8, lengthening the bailey main truss, firstly placing an I45 b-shaped steel pad beam on a bridge deck, hoisting the assembled bailey beam combined truss in advance by using an automobile crane, anchoring the bailey truss on a beam body by using a pressing beam through pre-embedding the fine-rolled deformed steel bars in a web plate, and anchoring the bailey main truss by using a pressing beam through vertical fine-rolled deformed steel bars in the web plate, and mounting a scissor brace by using a bailey pin; finally, using 230 t jacks to tighten all the rear anchor systems step by step;
And 9, installing a hanging basket traction device, enabling the hanging basket to move forward, arranging a stress baffle at the forefront end of the extended bailey girder truss, and enabling the hanging basket to move forward in place by adopting a penetrating jack or a chain block constant-speed traction template system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111411594B (en) * | 2020-04-03 | 2021-05-14 | 中国电建集团成都勘测设计研究院有限公司 | Continuous rigid frame bridge filled with concrete |
| CN112030786A (en) * | 2020-09-30 | 2020-12-04 | 中交路桥华南工程有限公司 | Portable bailey frame cradle |
| CN112030787A (en) * | 2020-09-30 | 2020-12-04 | 中交路桥华南工程有限公司 | Hang basket moving system |
| CN112323647B (en) * | 2020-10-29 | 2022-05-03 | 德州市公路工程总公司 | Rigid frame bridge hanging basket suspension casting system and construction method thereof |
| CN115110766A (en) * | 2022-07-11 | 2022-09-27 | 中铁十一局集团有限公司 | Pit internal vibration table suspended formwork structure and construction method |
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