CN112575697A - Rapid dismantling system and construction method for multi-layer overpass concrete continuous box girder ramp bridge - Google Patents
Rapid dismantling system and construction method for multi-layer overpass concrete continuous box girder ramp bridge Download PDFInfo
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Abstract
The invention relates to a rapid dismantling system for a layer overpass concrete continuous box girder ramp bridge, which comprises a ramp bridge, a lower layer bridge, a vehicle-mounted movable protective shed, a guardrail wing plate segment and a module vehicle-mounted movable rapid assembling and disassembling combined type bracket, wherein the ramp bridge is arranged on the lower layer bridge; the ramp bridge mainly comprises a ramp bridge box girder main body and a guardrail wing plate, wherein the ramp bridge box girder main body is cut into a box girder large block cutting section in a segmented mode, and the guardrail wing plate is cut into a guardrail wing plate section in a segmented mode. The invention has the beneficial effects that: the module vehicle-mounted movable type quick assembling and disassembling combined supporting technology and the vehicle-mounted movable type protection shed protection technology can accelerate the construction progress and ensure the structural safety of the lower-layer bridge. And the whole span structure is dismantled only by sealing the road for 24h, so that the interference influence of construction on traffic operation is minimized, and the economic and social benefits are remarkable.
Description
Technical Field
The invention belongs to the field of highway bridge dismantling, and particularly relates to a dismantling method for an upper bridge continuous concrete box girder of a multilayer overpass.
Background
The concrete continuous box girder bridge structure is dismantled by the conventional methods such as blasting method, mechanical site crushing method, cutting and block hoisting method and the like. However, for the removal of the ramp bridge of the traffic junction with heavy traffic, the removal process by the conventional blasting method and the mechanical crushing method not only seriously affects the normal operation of vehicles of the bridge on the lower layer of the bridge, but also generates noise and dust and forms aberration in civilized construction because the removal process is often positioned on the upper layer of the multi-layer overpass. By adopting a conventional cutting and blocking method, temporary buttresses need to be erected on the lower-layer bridge, structural additional stress can be generated, and the structural safety of the lower-layer bridge is directly influenced. Meanwhile, in a busy traffic junction area, the construction process does not allow long-term traffic closure, the bridge structure needs to be dismantled in a large section cutting and hoisting mode to speed up the progress, and the hoisting block is large. And the ramp beam body is of a bent structure, the section of the beam body is of an asymmetric shape, the beam section is complex in structure, the technical implementation difficulty is high, and the safety risk is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system and a construction method for quickly dismantling a concrete continuous box girder ramp bridge of a multilayer overpass.
The system for quickly dismantling the ramp bridge of the concrete continuous box girder of the multilayer overpass comprises the ramp bridge, a lower layer bridge, a vehicle-mounted movable protective shed, a guardrail wing plate segment and a module vehicle-mounted movable quick assembly and disassembly combined type bracket; the ramp bridge mainly comprises a ramp bridge box girder main body and guardrail wing plates, wherein the ramp bridge box girder main body is cut into a box girder large block cutting section in a segmented manner, and the guardrail wing plates are cut into guardrail wing plate sections in a segmented manner; a module vehicle-mounted movable quick assembly and disassembly combined type support is arranged at the pier top of a lower layer bridge below the ramp bridge, the module vehicle-mounted movable quick assembly and disassembly combined type support comprises a module vehicle and a Bailey support, and the Bailey support is erected on the module vehicle; and a vehicle-mounted movable protective shed is arranged at the construction and vehicle passing interface.
Preferably, the method comprises the following steps: the bailey bracket mainly comprises a double-spliced H-shaped steel bearing beam, an I-shaped steel distribution beam and a double-layer bailey beam, the I-shaped steel distribution beam is installed on the module vehicle, the double-layer bailey beam is installed above the I-shaped steel distribution beam, the I-shaped steel distribution beam is installed above the double-layer bailey beam, and the double-spliced H-shaped steel bearing beam is arranged above the I-shaped steel distribution beam to support the large-block cutting section of the box girder.
Preferably, the method comprises the following steps: the double-layer Bailey beam is provided with a reinforcing chord member, a reinforcing web member and a double-layer Bailey beam support.
Preferably, the method comprises the following steps: the vehicle-mounted movable protective shed mainly comprises a flat car, a movable steel tube foot support and waterproof cloth, wherein the movable steel tube foot support is arranged above the flat car, and the waterproof cloth is arranged on the movable steel tube foot support.
Preferably, the method comprises the following steps: two sides of the lower bridge are respectively provided with a large crane.
The construction method of the multi-layer overpass concrete continuous box girder ramp bridge rapid dismantling system comprises the following steps:
step S1: breaking bridge deck pavement; breaking bridge deck pavement by adopting a pickaxe, firstly breaking asphalt layer pavement, then breaking concrete pavement, and transporting pavement broken materials out of a construction site by adopting a transport vehicle; after the bridge deck pavement is dismantled, the hoisting hole is lofted;
step S2: cutting guard rail wing plates step by step;
step S2-1: determining the type of a large crane, a sectional cutting line of a guardrail wing plate and a four-step cutting and hoisting scheme according to the oblique crossing plane projection and the field construction conditions of the ramp bridge and the lower layer bridge, so that only half of lanes are closed during each step of cutting and hoisting, and the lower layer bridge is kept to pass in two directions;
step S2-2: closing a left hard road shoulder and a third lane of the lower layer bridge, and removing wing plates and guardrails above the lanes in three sections of 1, 2 and 3; the vehicle-mounted movable protection shed is in place below the wing plate and the guardrail cutting line; then drilling a wing plate hoisting hole and a cutting hole, wherein a steel wire rope penetrates through the wing plate hoisting hole of the segment 1, the wing plate guardrail of the segment 1 is hoisted at the bottom of a pocket, the steel wire rope is in a non-loose and non-tight state, a rope saw fixing guide wheel and a diamond rope are installed, the rope saw cuts the wing plate guardrail of the segment 1, the weight of the wing plate guardrail is gradually transferred to a crawler crane in the cutting process, a large arm of the crawler crane is rotated after cutting is finished, and the wing plate of the segment 1 is hoisted and removed and is placed to a filling site; similarly, the segments 1, 2 and 3 are sequentially cut in sequence, and when the segments are cut, the segments are firstly cut along the cross section and then cut along the longitudinal section; finally, bridge deck cleaning is carried out;
step S2-3: closing a first left lane of a lower bridge, and removing wing plates and guardrails above the lane in four sections of 4, 5, 6 and 7;
step S2-4: closing a right-width hard road shoulder and a third lane of the lower-layer bridge, and removing wing plates and guardrails above the lanes in three sections of 8, 9 and 10;
step S2-5: closing a first right lane of a lower bridge, and removing wing plates and guardrails above the lane in four sections of 11, 12, 13 and 14;
step S3: cutting a large section of a main body of the ramp box girder;
step S3-1: determining a large hanging section cutting scheme; determining the type selection of a large crane according to the oblique crossing plane projection and the field conditions of the ramp bridge and the lower layer bridge, dividing the large section of the box girder main body and determining a cutting line; carrying out the design of a module vehicle-mounted movable quick assembling and disassembling combined type bracket and the design of a lane sealing scheme; before implementation, local pressure bearing checking calculation is carried out on the lower-layer bridge structure, bearing capacity checking calculation is carried out on the bent cap, and therefore the influence of the removed temporary construction load of the concrete box girder on the lower-layer bridge structure and the bent cap is evaluated;
step S3-2: installing a module vehicle-mounted movable quick assembling and disassembling combined type bracket; the lower layer bridge seals the road, and a module vehicle-mounted movable quick assembly and disassembly combined type support is arranged; moving the module vehicle to be located at the pier top of the lower-layer bridge, then installing an I-beam distribution beam on the module vehicle, installing a double-layer Bailey beam above the I-beam distribution beam, then installing an I-beam distribution beam above the double-layer Bailey beam, and then arranging a double-spliced H-shaped steel bearing beam above the I-beam distribution beam to support the ramp box beam section;
step S3-3: cutting and hoisting the large section of the box girder; according to the field conditions of the multi-layer overpass, two large cranes are respectively arranged on two sides of the lower-layer bridge, and the two large crawler cranes carry out synchronous hoisting construction; after all the parts are finished, the module is dismantled, the vehicle-mounted movable quick assembly and disassembly combined type support is disassembled, the bridge floor is cleaned, and traffic is recovered;
step S4: crushing the segmental beam; after the concrete segmental beam is hoisted to the site, a pickaxe machine is adopted for crushing and dismantling, the reinforcing steel bars are recycled, and the mixed slag is uniformly transported to a specified position for treatment.
Preferably, the method comprises the following steps: before step S1, construction preparation is made, which comprises the following steps:
1) before construction, carrying out comprehensive on-site investigation, familiarizing with the construction environment, finishing construction site leveling and reinforced concrete hardening, and carrying out foundation bearing capacity checking calculation;
2) preparing a construction product: oxygen, acetylene, a steel wire rope protective sleeve and a hydroelectric facility;
3) the large crawler crane and the auxiliary truck crane enter the field and complete the test crane work;
4) structural design and material purchasing approach of the vehicle-mounted mobile protection shed;
5) and (3) designing a module vehicle-mounted movable quick-assembly and disassembly combined type support structure and purchasing materials to enter a field, and assembling the double-layer Bailey beam support standard sections.
Preferably, the method comprises the following steps: in the step 1) of construction preparation, slag is replaced and filled when a construction site is flat; when the reinforced concrete is hardened, a plurality of layers of reinforcing mesh sheets are laid.
Preferably, the method comprises the following steps: in the step S3-2, the double-layer Bailey beam is reinforced by the chord member and the web member and is assembled in the field in advance; the double-spliced H-shaped steel bearing beam reserves a rope saw cutting operation space.
Preferably, the method comprises the following steps: in the step S3-3, when hoisting operation is carried out, the crawler crane is displaced, the crawler crane is over-lifted and displaced, a segment steel wire rope is installed, and segments are cut; and sequentially rotating the large arms of the crawler cranes, moving the crawler cranes with loads to retreat, and lowering the segments to the ground.
The invention has the beneficial effects that: the module vehicle-mounted movable type rapid assembling and disassembling combined supporting technology and the vehicle-mounted movable type protection shed protection technology adopted by the invention can accelerate the construction progress and ensure the structural safety of the lower layer bridge. And the whole span structure is dismantled only by sealing the road for 24h, so that the interference influence of construction on traffic operation is minimized, and the economic and social benefits are remarkable.
Drawings
FIG. 1 is a schematic plan view of a ramp bridge;
FIG. 2 is a schematic view of a mobile protective shed for a vehicle;
fig. 3 is a schematic view of the sectional and stepwise dismantling of the guard rail wing plate (fig. 3a to 3b are schematic views of the dismantling of the guard rail wing plate in the first step to the fourth step, respectively);
FIG. 4 is a schematic view of a modular vehicle mounted mobile quick connect disconnect modular support in elevation;
FIG. 5 is a side schematic view of a bailey stand;
fig. 6 is a flow chart of the construction process of the present patent.
Description of reference numerals: 1. a ramp bridge; 2. a lower bridge; 3. a lower bridge pier top line; 4. a ramp pier stud line; 5. a vehicle-mounted mobile protection shed; 5-1, flatbed cart; 5-2, moving steel pipe foot supports; 5-3, waterproof cloth; 6. a guardrail wing panel segment; 7. a large crane; 8. a ramp bridge box girder main body; 9. the combined bracket is quickly assembled and disassembled in a vehicle-mounted movable mode; 9-1, module vehicle; 9-2, double-spliced H-shaped steel bearing beam; 9-3. beret beam; 9-4. reinforcing chord members; 9-5. reinforcing web members; 9-6. I-steel distribution beam; 9-7, double-layer Bailey beam; 9-8 double-layer Bailey beam supports; 11. and cutting the section by the box girder block.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The construction of dismantling and building bridges is carried out in a traffic hub area with busy traffic, and the construction is mostly emergency engineering, the construction period is short, the task is heavy, and the safety risk is high. The invention provides a system and a construction method for quickly dismantling an upper bridge continuous box girder based on a module vehicle-mounted combined support. By adopting the method, the requirement of transient traffic closure can be met, the fast and efficient road occupation construction is realized, and the traffic closure time of the lower-layer bridge is reduced as much as possible on the premise of ensuring the safety.
Example one
The system for quickly dismantling the ramp bridge of the concrete continuous box girder of the multilayer overpass comprises a ramp bridge 1, a lower layer bridge 2, a vehicle-mounted movable protective shed 5, a guardrail wing plate section 6 and a module vehicle-mounted movable quick assembly and disassembly combined type bracket 9; the ramp bridge 1 mainly comprises a ramp bridge box girder main body 8 and guardrail wing plates, wherein the ramp bridge box girder main body 8 is cut into a box girder large block cutting section 11 in a segmented manner, and the guardrail wing plates are cut into guardrail wing plate sections 6 in a segmented manner; a module vehicle-mounted movable quick assembly and disassembly combined type support 9 is arranged on a lower bridge pier stud capping beam bridge floor of a lower bridge 2 below a ramp bridge 1, the module vehicle-mounted movable quick assembly and disassembly combined type support 9 comprises a module vehicle 9-1 and a bailey support, the bailey support is erected on the module vehicle 9-1 and mainly comprises a double-spliced H-shaped steel bearing beam 9-2, a reinforcing chord 9-4, a reinforcing web member 9-5, an I-shaped steel distribution beam 9-6, a double-layer bailey beam 9-7 and a double-layer bailey beam support 9-8, the I-shaped steel distribution beam 9-6 is arranged on the module vehicle 9-1, the double-layer bailey beam 9-7 is arranged above the I-shaped steel distribution beam 9-6, the reinforcing chord 9-4, the reinforcing web member 9-5 and the double-layer bailey beam support 9-8 are arranged on the double-layer bailey beam 9-7, an I-beam distribution beam 9-6 is arranged above the double-layer Bailey beam 9-7, and a double-spliced H-beam bearing beam 9-2 is arranged above the I-beam distribution beam 9-6 to support the box beam large block cutting section 11; the construction and vehicle passing interface is provided with a vehicle-mounted movable protective shed 5, the vehicle-mounted movable protective shed 5 mainly comprises a flat car 5-1, a movable steel pipe pin support 5-2 and waterproof cloth 5-3, the movable steel pipe pin support 5-2 is arranged above the flat car 5-1, and the waterproof cloth 5-3 is arranged on the movable steel pipe pin support 5-2.
And determining the road occupation condition of the ramp bridge according to the plane projection of the three-dimensional oblique crossing of the ramp bridge and the lower layer bridge. And the ramp bridge guardrail and the wing plate are cut in a blocking manner, and the ramp bridge guardrail and the wing plate to be detached are cut in a blocking manner and then hung to a construction site below the bridge through the cooperation of a crawler crane and a rope saw (keeping the lower layer of bridge to pass in two directions). The guardrail and the wing plate are divided into 1-10 sections, and the cutting and hoisting are carried out at 4 steps, wherein the first step is to cut and hoist No. 1-3 blocks (a hard road shoulder and the outermost side lane are closed, and the first lane, the second lane and the other half lane of the road are kept to pass through); secondly, cutting and hoisting a No. 4-5 block (closing the first lane and the second lane of the frame and keeping the third lane to pass and the other half lane to pass), and thirdly cutting and hoisting a No. 6-7 block (closing the first lane and the second lane of the frame and keeping the third lane to pass and the frame to pass); and fourthly, cutting and hoisting 9-10 blocks (sealing the other hard road shoulder and the third lane and keeping the other first lane, the other second lane and the lane to pass), wherein the sealing time of partial lanes is 12h when each step of cutting and hoisting is carried out, and a vehicle-mounted movable protective shed is arranged at the construction and vehicle passing interface.
And determining the road occupation condition of the ramp bridge according to the plane projection of the three-dimensional oblique crossing of the ramp bridge and the lower layer bridge. And the ramp bridge guardrail and the wing plate are cut in a blocking manner, and the ramp bridge guardrail and the wing plate are lifted to a construction site scheme below the bridge after being cut in a blocking manner by adopting the cooperation of a crawler crane and a rope saw. The guardrail and the wing plate are divided into 1-14 sections, and are cut and hoisted in 4 steps, wherein in the first step, a No. 1-3 block is cut and hoisted (a hard road shoulder and an outermost side lane are closed, and the first lane, the second lane and the other half lane of the block are kept to pass through); cutting and hoisting a No. 4-7 block (sealing the first lane and the second lane of the main frame and keeping the third lane and the other half lane to pass), and cutting and hoisting a No. 8-10 block (sealing the other hard shoulder and the third lane and keeping the other first lane, the other second lane and the main frame to pass); and fourthly, cutting and hoisting a No. 11-14 block (sealing the other first lane and the other second lane, keeping the third lane and the current lane), wherein when each step of cutting and hoisting is carried out, the sealing time of part of lanes is 12h, and a vehicle-mounted movable protective shed is arranged at the construction and vehicle passing interface.
And temporarily closing the traffic under the bridge for 24 hours, and adopting a large-section cutting and hoisting scheme for the box girder body of the ramp bridge. The temporary support adopts a module vehicle-mounted movable combined support which is quickly assembled and disassembled, the module vehicle is mounted on the pier top of the lower layer bridge and moves in place, and then a double-layer Bailey beam support is erected on the module vehicle-mounted combined support to form a movable module vehicle-mounted support system so as to support a beam body to be disassembled. The beam body is cut by a rope saw, and the large crane is hoisted to a ground construction site to be crushed. Local bearing checking calculation needs to be carried out on the bridge structure before implementation, bearing capacity checking calculation needs to be carried out on the bent cap to evaluate the influence of temporary construction loads such as the cut concrete box girder on the lower-layer bridge structure and the bent cap.
Example two
The construction method of the rapid dismantling system for the multi-layer overpass concrete continuous box girder ramp bridge comprises the following steps:
step one, construction preparation. (1) Before construction, comprehensive on-site investigation is carried out, the construction environment is familiar, the construction site is leveled (necessary slag is changed and filled) and the reinforced concrete with the thickness of 20cm is hardened (two layers of reinforcing mesh sheets are laid), and the bearing capacity of the foundation is checked. (2) Oxygen, acetylene, steel wire rope protective sleeves, hydroelectric facilities and other construction articles are in place. (3) And the large crawler crane and the auxiliary truck crane enter the field and complete the test crane work. (4) The structural design of the vehicle-mounted movable protective shed and the material purchasing approach. (5) And (3) designing a modular vehicle-mounted movable quickly-assembled and quickly-disassembled combined support structure and purchasing materials to enter a field to assemble the double-layer Bailey beam support standard sections.
And step two, breaking the bridge deck pavement. Adopt the pickaxe machine to abolish the bridge deck pavement, at first abolish the pitch layer and pave, abolish the concrete pavement again, the broken thing of mating formation adopts the transport vechicle to transport out of construction site. And after the bridge deck pavement is dismantled, the hoisting hole is lofted.
And step three, cutting the guard rail wing plates step by step.
(1) According to the oblique crossing plane projection and the field construction conditions of the ramp bridge and the lower layer bridge, the type of the large crane (the maximum hoisting weight and the acting radius) and the segmental cutting line of the guardrail wing plate and a four-step cutting and hoisting scheme are determined, so that when each step of cutting and hoisting is carried out, only half part of lanes in the large crane are required to be closed, and the bidirectional passing of the lower layer bridge can be kept.
(2) And (3) closing the left hard road shoulder and the third lane 12h of the lower layer bridge, and removing the wing plates and the guardrails above the lanes in three sections of 1, 2 and 3, as shown in a figure 3a (first step). The vehicle-mounted movable protection shed is in place below the wing plate and the guardrail cutting line, so that the roadway is prevented from being polluted by sewage; then drilling a wing plate hoisting hole and a cutting hole, wherein a steel wire rope penetrates through the wing plate hoisting hole of the segment 1, the wing plate guardrail of the segment 1 is hoisted at the bottom of a pocket, the steel wire rope is in a non-loose and non-tight state, a rope saw fixing guide wheel and a diamond rope are installed, the rope saw cuts the wing plate guardrail of the segment 1, the weight of the wing plate guardrail is gradually transferred to a crawler crane in the cutting process, a large arm of the crawler crane is rotated after cutting is finished, and the wing plate of the segment 1 is hoisted and removed and is placed to a filling site; similarly, the segments 1, 2 and 3 are sequentially cut in sequence, and when the segments are cut, the segments are firstly cut along the cross section and then cut along the longitudinal section. And finally, cleaning the bridge deck.
(3) And (3) closing the first left lane 12h of the lower bridge, and removing the wing plates and the guardrails above the first left lane in four sections of 4, 5, 6 and 7, as shown in fig. 3b (second step).
(4) And (3) closing the right hard road shoulder of the lower layer bridge and a third lane 12h, and removing wing plates and guardrails above the lane in three sections of 8, 9 and 10, as shown in figure 3c (third step).
(5) And (5) closing the first right lane 12h of the lower bridge, and removing the wing plates and the guardrails above the first right lane in four sections of 11, 12, 13 and 14, as shown in fig. 3d (fourth step).
And step four, cutting the large sections of the box girder main body of the ramp.
(1) And determining a large hanging section cutting scheme. According to the oblique crossing plane projection and the field conditions of the ramp bridge and the lower layer bridge, the model selection of the large crane is determined (the maximum hoisting weight and the acting radius are determined), the large section of the box girder main body is divided, and the cutting line is determined. And (3) designing a module vehicle-mounted combined support frame and a lane sealing scheme (transient partial lane sealing or full lane sealing). Because the cutting weight of the large section of the box girder main body of the ramp bridge is borne by the module vehicle-mounted combined type support, and the module vehicle-mounted combined type support is positioned on the pier top of the lower layer bridge, before implementation, local bearing checking is firstly carried out on the lower layer bridge structure, bearing capacity checking is carried out on the cover girder, and influences of the removed temporary construction loads such as the concrete box girder on the lower layer bridge structure and the cover girder are evaluated.
(2) And (5) mounting the module vehicle-mounted combined support. The lower layer bridge is sealed, a module vehicle-mounted movable quick assembly and disassembly combined type support is arranged, and the structure of the module vehicle-mounted movable quick assembly and disassembly combined type support is shown in figures 4 and 5; moving the module vehicle to be positioned at the pier top of a lower layer of bridge, then installing an I-beam distribution beam of 12.6a on the module vehicle, two layers of Bailey beams (chord members and web members are reinforced and are assembled in the field in advance), then installing the I-beam distribution beam of 12.6a on the I-beam distribution beam, and arranging double H450-600 (height-adjustable) section steel supporting ramp box girder segments on the I-beam distribution beam. The upper layer of H-shaped steel support needs to reserve a rope saw cutting operation space and is arranged at a position 50cm away from the cutting line.
(3) And (5) cutting and hoisting the large section of the box girder. According to the field conditions of the multi-layer overpass, two large cranes can be respectively arranged on two sides of the lower-layer bridge. In order to shorten the closed traffic time, the two large crawler cranes carry out synchronous hoisting construction. During operation, the crawler crane shifts, the crawler crane superlifts and shifts, segment steel wire ropes are installed, and segments are cut. And sequentially rotating the large arms of the crawler cranes, moving the crawler cranes with loads to retreat, and lowering the segments to the ground. And after all the modules are finished, dismantling the module combined support, cleaning the bridge floor and recovering traffic.
And step five, crushing the segmental beam. After the concrete segmental beam is hoisted to the site, a pickaxe machine is adopted for crushing and dismantling, steel bars are recycled, and mixed slag and the like are uniformly conveyed to a specified position for treatment.
Claims (10)
1. The utility model provides a continuous case roof beam ramp bridge of multilayer overpass concrete demolishs system fast which characterized in that: comprises a ramp bridge (1), a lower layer bridge (2), a vehicle-mounted movable protective shed (5), a guardrail wing plate section (6) and a module vehicle-mounted movable quick assembly and disassembly combined type bracket (9); the ramp bridge (1) mainly comprises a ramp bridge box girder main body (8) and guardrail wing plates, wherein the ramp bridge box girder main body (8) is cut into a box girder large block cutting section (11) in a segmented manner, and the guardrail wing plates are cut into guardrail wing plate sections (6) in a segmented manner; a module vehicle-mounted movable quick assembly and disassembly combined type support (9) is arranged at the pier top of a lower layer bridge (2) below the ramp bridge (1), the module vehicle-mounted movable quick assembly and disassembly combined type support (9) comprises a module vehicle (9-1) and a Bailey support, and the Bailey support is erected on the module vehicle (9-1); and a vehicle-mounted movable protective shed (5) is arranged at the construction and vehicle passing interface.
2. The system for rapidly dismantling the concrete continuous box girder ramp bridge of the multi-layer overpass according to claim 1, wherein: the Bailey bracket mainly comprises double-spliced H-shaped steel bearing beams (9-2), I-shaped steel distribution beams (9-6) and double-layer Bailey beams (9-7), the I-shaped steel distribution beams (9-6) are installed on a module vehicle (9-1), the double-layer Bailey beams (9-7) are installed above the I-shaped steel distribution beams (9-6), the I-shaped steel distribution beams (9-6) are installed above the double-layer Bailey beams (9-7), and the double-spliced H-shaped steel bearing beams (9-2) are arranged above the I-shaped steel distribution beams (9-6) to support box girder large block cutting sections (11).
3. The system for rapidly dismantling the concrete continuous box girder ramp bridge of the multi-layer overpass according to claim 2, wherein: the double-layer Bailey beam (9-7) is provided with a reinforcing chord member (9-4), a reinforcing web member (9-5) and a double-layer Bailey beam support (9-8).
4. The system for rapidly dismantling the concrete continuous box girder ramp bridge of the multi-layer overpass according to claim 1, wherein: the vehicle-mounted movable protective shed (5) mainly comprises a flat car (5-1), a movable steel pipe foot support (5-2) and waterproof cloth (5-3), wherein the movable steel pipe foot support (5-2) is arranged above the flat car (5-1), and the waterproof cloth (5-3) is arranged on the movable steel pipe foot support (5-2).
5. The system for rapidly dismantling the concrete continuous box girder ramp bridge of the multi-layer overpass according to claim 1, wherein: two sides of the lower layer bridge (2) are respectively provided with a large crane (7).
6. A construction method of a multi-layer overpass concrete continuous box girder ramp bridge rapid dismantling system as claimed in claim 1, characterized by comprising the steps of:
step S1: breaking bridge deck pavement; breaking bridge deck pavement by adopting a pickaxe, firstly breaking asphalt layer pavement, then breaking concrete pavement, and transporting pavement broken materials out of a construction site by adopting a transport vehicle; after the bridge deck pavement is dismantled, the hoisting hole is lofted;
step S2: cutting guard rail wing plates step by step;
step S2-1: determining the type of a large crane, a sectional cutting line of a guardrail wing plate and a four-step cutting and hoisting scheme according to the oblique crossing plane projection and the field construction conditions of the ramp bridge and the lower layer bridge, so that only half of lanes are closed during each step of cutting and hoisting, and the lower layer bridge is kept to pass in two directions;
step S2-2: closing a left hard road shoulder and a third lane of the lower layer bridge, and removing wing plates and guardrails above the lanes in three sections of 1, 2 and 3; the vehicle-mounted movable protection shed is in place below the wing plate and the guardrail cutting line; then drilling a wing plate hoisting hole and a cutting hole, wherein a steel wire rope penetrates through the wing plate hoisting hole of the segment 1, the wing plate guardrail of the segment 1 is hoisted at the bottom of a pocket, the steel wire rope is in a non-loose and non-tight state, a rope saw fixing guide wheel and a diamond rope are installed, the rope saw cuts the wing plate guardrail of the segment 1, the weight of the wing plate guardrail is gradually transferred to a crawler crane in the cutting process, a large arm of the crawler crane is rotated after cutting is finished, and the wing plate of the segment 1 is hoisted and removed and is placed to a filling site; similarly, the segments 1, 2 and 3 are sequentially cut in sequence, and when the segments are cut, the segments are firstly cut along the cross section and then cut along the longitudinal section; finally, bridge deck cleaning is carried out;
step S2-3: closing a first left lane of a lower bridge, and removing wing plates and guardrails above the lane in four sections of 4, 5, 6 and 7;
step S2-4: closing a right-width hard road shoulder and a third lane of the lower-layer bridge, and removing wing plates and guardrails above the lanes in three sections of 8, 9 and 10;
step S2-5: closing a first right lane of a lower bridge, and removing wing plates and guardrails above the lane in four sections of 11, 12, 13 and 14;
step S3: cutting a large section of a main body of the ramp box girder;
step S3-1: determining a large hanging section cutting scheme; determining the type selection of a large crane according to the oblique crossing plane projection and the field conditions of the ramp bridge and the lower layer bridge, dividing the large section of the box girder main body and determining a cutting line; carrying out the design of a module vehicle-mounted movable quick assembling and disassembling combined type bracket and the design of a lane sealing scheme; before implementation, local pressure bearing checking calculation is carried out on the lower-layer bridge structure, bearing capacity checking calculation is carried out on the bent cap, and therefore the influence of the removed temporary construction load of the concrete box girder on the lower-layer bridge structure and the bent cap is evaluated;
step S3-2: installing a module vehicle-mounted movable quick assembling and disassembling combined type bracket; the lower layer bridge seals the road, and a module vehicle-mounted movable quick assembly and disassembly combined type support is arranged; moving the module vehicle to be located at the pier top of the lower-layer bridge, then installing an I-beam distribution beam on the module vehicle, installing a double-layer Bailey beam above the I-beam distribution beam, then installing an I-beam distribution beam above the double-layer Bailey beam, and then arranging a double-spliced H-shaped steel bearing beam above the I-beam distribution beam to support the ramp box beam section;
step S3-3: cutting and hoisting the large section of the box girder; according to the field conditions of the multi-layer overpass, two large cranes are respectively arranged on two sides of the lower-layer bridge, and the two large crawler cranes carry out synchronous hoisting construction; after all the parts are finished, the module is dismantled, the vehicle-mounted movable quick assembly and disassembly combined type support is disassembled, the bridge floor is cleaned, and traffic is recovered;
step S4: crushing the segmental beam; after the concrete segmental beam is hoisted to the site, a pickaxe machine is adopted for crushing and dismantling, the reinforcing steel bars are recycled, and the mixed slag is uniformly transported to a specified position for treatment.
7. The construction method of the multi-layer overpass concrete continuous box girder ramp bridge quick dismantling system according to the claim 6, wherein before the step S1, the construction preparation is made, comprising the following steps:
1) before construction, carrying out comprehensive on-site investigation, familiarizing with the construction environment, finishing construction site leveling and reinforced concrete hardening, and carrying out foundation bearing capacity checking calculation;
2) preparing a construction product: oxygen, acetylene, a steel wire rope protective sleeve and a hydroelectric facility;
3) the large crawler crane and the auxiliary truck crane enter the field and complete the test crane work;
4) structural design and material purchasing approach of the vehicle-mounted mobile protection shed;
5) and (3) designing a module vehicle-mounted movable quick-assembly and disassembly combined type support structure and purchasing materials to enter a field, and assembling the double-layer Bailey beam support standard sections.
8. The construction method of the multi-layer overpass concrete continuous box girder ramp bridge rapid demolition system according to claim 7, characterized in that: in the step 1) of construction preparation, slag is replaced and filled when a construction site is flat; when the reinforced concrete is hardened, a plurality of layers of reinforcing mesh sheets are laid.
9. The construction method of the multi-layer overpass concrete continuous box girder ramp bridge rapid demolition system according to claim 6, characterized in that: in the step S3-2, the double-layer Bailey beam is reinforced by the chord member and the web member and is assembled in the field in advance; the double-spliced H-shaped steel bearing beam reserves a rope saw cutting operation space.
10. The construction method of the multi-layer overpass concrete continuous box girder ramp bridge rapid demolition system according to claim 6, characterized in that: in the step S3-3, when hoisting operation is carried out, the crawler crane is displaced, the crawler crane is over-lifted and displaced, a segment steel wire rope is installed, and segments are cut; and sequentially rotating the large arms of the crawler cranes, moving the crawler cranes with loads to retreat, and lowering the segments to the ground.
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