CN115679835A - Block-by-block prefabricating construction method for steel box girder of cable-stayed bridge segment - Google Patents
Block-by-block prefabricating construction method for steel box girder of cable-stayed bridge segment Download PDFInfo
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- CN115679835A CN115679835A CN202211442099.1A CN202211442099A CN115679835A CN 115679835 A CN115679835 A CN 115679835A CN 202211442099 A CN202211442099 A CN 202211442099A CN 115679835 A CN115679835 A CN 115679835A
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Abstract
The application discloses a block prefabricating construction method for a steel box girder of a cable-stayed bridge segment, which comprises the steps of transversely dividing a standard segment into three assembling and welding modules for manufacturing, manufacturing a temporary matching piece, and erecting a jig frame on a pre-assembly field; then sequentially hoisting three assembly welding modules, transversely placing the three assembly welding modules on a jig frame and aligning the three assembly welding modules to complete the step of positioning a group of standard segments to be assembled; circularly carrying out the step of positioning the standard sections to be assembled, matching the three assembly welding modules into the standard sections by using temporary matching pieces, and matching a plurality of the standard sections into the steel box girder combined section; removing the connection of the temporary matching parts, leaving a group of standard sections at the rearmost end of the jig frame, transferring the remaining assembly welding modules to the next construction area one by using a beam transporting vehicle, and moving the group of standard sections at the rearmost end of the jig frame to the front end of the jig frame; and finally repeating the step S2 and the step S3 to finish the block prefabrication construction of the steel box girder. This application has realized the transportation purpose of steel case roof beam in narrow and small pavement.
Description
Technical Field
The application relates to the technical field of steel box girder prefabrication construction, in particular to a cable-stayed bridge section steel box girder block prefabrication construction method.
Background
The construction of the main girder of the cable-stayed bridge usually adopts a method of assembling the cantilever of a bridge deck crane, before the assembly of the bridge deck, the standard sections of each steel box girder are assembled in advance in a pre-assembling field, after the matching requirements between the adjacent standard sections are met, the standard sections are transported to a gantry crane lifting station of the bridge deck one by one according to the assembled sequence, and the subsequent girder feeding construction is carried out.
When a large-span bridge is constructed at a wharf, the access road is narrow, but the length of the standard section of the steel box girder reaches 30m, the width of the standard section of the steel box girder also has 16m, and the steel box girder is not beneficial to a girder transporting vehicle to transport the steel box girder on the narrow access road, so that an improvement space is still left.
Disclosure of Invention
In order to realize the transfer purpose of the steel box girder in the narrow access way, the application provides a cable-stayed bridge section steel box girder block prefabricating construction method.
The application provides a cable-stayed bridge segment steel box girder block prefabricating construction method which adopts the following technical scheme:
a cable-stayed bridge segment steel box girder block prefabricating construction method comprises the following steps:
s1: construction preparation: dividing the standard segment into three assembly welding modules transversely, manufacturing a temporary matching piece, and building a jig frame on a pre-splicing field;
s2: pre-splicing steel box girders: sequentially hoisting three assembly welding modules, transversely placing the three assembly welding modules on a jig frame and aligning the three assembly welding modules to complete the positioning step of a group of standard segments to be assembled; circularly performing the step of positioning the standard sections to be assembled, matching the three assembly welding modules into the standard sections by using temporary matching pieces, and matching the plurality of standard sections into the steel box girder combined section;
s3: transfer of the assembly welding module: removing the connection of the temporary matching parts, leaving a group of standard sections at the rearmost end of the jig frame, transferring the remaining assembly welding modules to the next construction area one by utilizing a beam transporting vehicle, and moving the group of standard sections at the rearmost end of the jig frame to the front end of the jig frame;
s4: and repeating the S2 and the S3 to finish the block prefabrication construction of the steel box girder.
Through adopting above-mentioned technical scheme, divide into three section assembly welding module transportation with standard festival section, thereby be convenient for fortune roof beam car loads and unloads, thereby be convenient for realize the transportation purpose of steel case roof beam in narrow and small pavement, in addition, the bed-jig is being set up in the district of piecing together in advance, and utilize the temporary matching spare to assemble adjacent assembly welding module, form complete standard festival section, and accomplish assembling of adjacent standard festival section, improve follow-up installation accuracy at the bridge floor, after other group standard festival sections are dismantled, leave last a set of standard stage that continues to connect the back as the template at the bed-jig, can realize the accuracy of assembling in succession.
Preferably, in S1, mounting seats are respectively mounted on two sides of the jig frame, and upper ends of the two mounting seats are both slidably connected with a sliding rail for connecting the temporary matching parts; the two slide rails are respectively arranged obliquely downwards towards the trisection point of the standard section.
By adopting the technical scheme, the temporary matching piece can slide to the trisection point of the standard section to be in place under the action of the gravity of the temporary matching piece, and the mounting efficiency of the temporary matching piece is improved.
Preferably, the slide rail includes slope storage section and horizontal buffering section, the horizontal buffering section is located the slope lower extreme of slope storage section, the horizontal buffering section is provided with the blanking mouth, the blanking mouth is located standard segment's trisection point directly over.
Through adopting above-mentioned technical scheme, the slope storage section not only plays the guide effect, still possesses the storage function simultaneously to set up the blanking mouth in horizontal buffering section, so that last blowing need not the workman and carry interim matching piece, and simplify the location operation of seeing the piece of interim matching, be favorable to alleviateing workman working strength.
Preferably, the temporary matching piece comprises two L-shaped plates, the two L-shaped plates correspond to the two adjacent assembly welding modules one by one, and the two L-shaped plates are mutually attached and fixed through bolts; in the S2, the temporary matching piece falls to the splicing position of the adjacent assembly welding modules through the slide rail to be in place, and then the two L-shaped plates of the temporary matching piece are respectively fixed on the upper surfaces of the corresponding assembly welding modules; and in the step of unlocking the temporary matching piece in the step S3, the bolt between the two L-shaped plates is taken out so as to remove the connection of the adjacent assembly welding modules.
Through adopting above-mentioned technical scheme to realize assembling and dismantling the function of adjacent assembly welding module, be favorable to improving the efficiency of installing and removing of assembly welding module.
Preferably, the L-shaped plate comprises vertical plates and transverse plates which are perpendicular to each other, in the same temporary matching piece, the two vertical plates are mutually abutted, and the two transverse plates are spliced into a square bottom plate adaptive to the width of the slide rail; in the S1, the temporary matching pieces are stored in the inclined storage section of the slide rail, the structures of the temporary matching pieces used between the adjacent assembly welding modules are the same as those of the temporary matching pieces used between the adjacent standard sections, and in the inclined storage section, one temporary matching piece used between the adjacent standard sections is arranged every two temporary matching pieces used between the adjacent assembly welding modules; and in the S2, the sliding rails move longitudinally and release the temporary matching pieces one by one.
By adopting the technical scheme, the positions of the temporary matching pieces between the adjacent assembly welding modules and the temporary matching pieces for the adjacent standard sections are adjusted, so that the temporary matching pieces between the adjacent assembly welding modules and between the adjacent standard sections can be simultaneously positioned in the process of longitudinal sliding of the sliding rail, and the integral installation efficiency of the temporary matching pieces is improved.
Preferably, the slope lower extreme of slide rail is provided with the cylinder, cylinder end is provided with the electro-magnet, the L template is iron plate, in S2, at the in-process that the slide rail removed to the assigned position, the electro-magnet circular telegram is fixed to carrying out magnetism to the L template, when the slide rail was taken one' S place at the assigned position, the cylinder shrink to inhale the matching piece to blanking mouth department temporarily through the electro-magnet, during the blanking, the electro-magnet outage to release matching piece temporarily, matching piece temporarily falls to corresponding mounted position perpendicularly.
If avoid the condition that temporary matching spare glides to blanking mouth department and directly falls, the collision appears easily and the pop-off mounted position, through adopting above-mentioned technical scheme, cylinder and electro-magnet play restriction and traction, are favorable to realizing the purpose that the stable perpendicular whereabouts of temporary matching spare to make temporary matching spare take one's place steadily.
Preferably, a through groove is formed in the bottom of the slide rail, the through groove extends along the length direction of the slide rail and is communicated with the blanking port, in the step S1, the bottom of the transverse plate is coated with the binder, and the position of the through groove is located right below the position where the binder is coated.
Through adopting above-mentioned technical scheme, the probability that the temporary matching spare bullet deviate from the mounted position is further reduced to the binder, simultaneously, for, through seting up logical groove for the binder scribbles the position and does not contact with the slide rail, improves the condition that temporary matching spare glues firmly and glues diapire in the slide rail greatly.
Preferably, the slide rail slope upper end is fixed with the slider, slider sliding connection is in the mount pad top, mount pad top longitudinal rotation is connected with the screw rod, the screw rod screw thread runs through the slider, the mount pad is installed and is ordered about screw rod pivoted driving piece.
By adopting the technical scheme, the automation of the discharging operation of the temporary matching parts and the accuracy of the discharging position are realized.
Drawings
Fig. 1 is a schematic diagram of a state before material discharge in a cable-stayed bridge section steel box girder block prefabrication construction method in an embodiment of the application.
Fig. 2 is an enlarged schematic view at a in fig. 1.
Fig. 3 is a schematic structural view of a slide rail in a cable-stayed bridge section steel box girder block prefabrication construction method according to an embodiment of the application.
Fig. 4 is a schematic structural view of the cable-stayed bridge segment steel box girder block prefabrication construction method during material discharging in the embodiment of the application.
Fig. 5 is a schematic structural diagram of a cable-stayed bridge segment steel box girder after material discharge in the block prefabrication construction method of the embodiment of the application.
Description of reference numerals: 1. a standard segment; 11. assembling and welding the modules; 2. a jig frame; 21. a mounting seat; 3. a drive member; 4. a screw; 5. a slide rail; 51. inclining the material storage section; 511. a slider; 512. a through groove; 52. a horizontal buffer section; 521. a blanking port; 6. an L-shaped plate; 61. a vertical plate; 62. a transverse plate; 63. a bolt; 7. a cylinder; 71. an electromagnet.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a construction method for prefabricating steel box girders of cable-stayed bridge sections in blocks, which comprises the following steps of:
s1: construction preparation: the standard segment 1 is transversely divided into three assembly welding modules 11 to be manufactured, temporary matching pieces are manufactured, a jig frame 2 is erected in a pre-assembly field, and the length direction of the jig frame 2 is used as the longitudinal direction. The transverse direction of the rack is used for placing three assembling and welding modules 11 so as to splice the standard sections 1 of the steel box girder, and the longitudinal direction of the bed jig 2 is used for splicing a plurality of standard sections 1 so as to splice the combined girder sections.
In addition, install mount pad 21 respectively at bed-jig 2 both sides, two equal sliding connection in mount pad 21 upper ends have slide rail 5, and slide rail 5 supplies the connection of temporary matching spare. Specifically, a sliding block 511 is fixed at the inclined upper end of the sliding rail 5, the sliding block 511 is connected to the top of the mounting seat 21 in a sliding manner, a screw rod 4 is longitudinally and rotatably connected to the top of the mounting seat 21, the screw rod 4 penetrates through the sliding block 511 in a threaded manner, and a driving piece 3 driving the screw rod 4 to rotate is mounted on the mounting seat 21. The driving piece 3 is a motor, and the output shaft of the motor is coaxially connected with the screw rod 4. So as to realize the automation of the emptying operation of the temporary matching parts and the accuracy of the emptying position.
Wherein, two slide rails 5 are respectively arranged obliquely downwards towards the trisection point of the standard segment 1 so as to realize the movement by using the self-gravity of the temporary matching piece. Specifically, the slide rail 5 includes an inclined material storage section 51 and a horizontal buffer section 52, the horizontal buffer section 52 is located at the inclined lower end of the inclined material storage section 51, the horizontal buffer section 52 is provided with a material discharge opening 521, and the material discharge opening 521 is located right above the trisection point of the standard segment 1. The inclined material storage section 51 not only plays a guiding role, but also has a material storage function. The blanking port 521 is arranged on the horizontal buffer section 52, so that continuous discharging is realized, a worker does not need to carry a temporary matching piece, the positioning operation of the temporary matching piece is simplified, and the work intensity of the worker is favorably reduced.
In order to improve the adaptability of the temporary matching member to the assembly welding module 11 and the adaptability of the slide rail 5 to the temporary matching member. The temporary matches for adjacent assembly-welding modules 11 and for adjacent standard segments 1 are customized to the same structure.
Specifically, the temporary matching piece comprises two L-shaped plates 6, the two L-shaped plates 6 correspond to the two adjacent assembly welding modules 11 one by one, and the two L-shaped plates 6 are mutually attached and fixed through bolts 63. Wherein, L template 6 includes mutually perpendicular's riser 61 and diaphragm 62, and in same temporary matching spare, two risers 61 butt each other, and two diaphragms 62 piece becomes the square shape bottom plate of adaptation in slide rail 5 width. And every two temporary matching pieces used between the adjacent assembly welding modules 11 are provided with one temporary matching piece used between the adjacent standard segments 1, the two temporary matching pieces have the same structure, and only the placing directions are different.
In order to reduce the situation that the L-shaped plate 6 is popped out of the installation position due to collision, an air cylinder 7 is arranged at the inclined lower end of the sliding rail 5, an electromagnet 71 is arranged at the end part of the air cylinder 7, and the L-shaped plate 6 is made of iron. The temporary matching piece can be limited and dragged by stretching of the air cylinder 7 and powering on and powering off of the electromagnet 71, so that the temporary matching piece vertically falls to a corresponding mounting position from a static state. In addition, it is necessary to ensure that the distance between the bottom wall of the horizontal buffer section 52 and the upper surface of the assembly welding module 11 is larger than the height of the vertical plate 61.
In order to further reduce the probability that the temporary matching member is popped out of the installation position, a through groove 512 is arranged at the bottom of the slide rail 5, the through groove 512 extends along the length direction of the slide rail 5 and is communicated with a blanking port 521, then the bottom of the transverse plate 62 is coated with the adhesive, and the through groove 512 is positioned under the adhesive coating position, so that the adhesive coating position is not contacted with the slide rail 5, and the condition that the temporary matching member is adhered to the inner bottom wall of the slide rail 5 is greatly improved.
In S2, in the step of unlocking the temporary matching member in S3, the bolt 63 between the two L-shaped plates 6 is taken out to release the connection between the adjacent assembly welding modules 11.
S2: pre-splicing steel box girders: sequentially hoisting three assembly welding modules 11, transversely placing the three assembly welding modules 11 on a jig frame 2 and aligning to complete the positioning step of a group of standard segments 1 to be assembled; and circularly carrying out the step of positioning the standard segment 1 to be assembled so as to complete the step of positioning the combined beam segment. And then matching the three assembling and welding modules 11 into the standard sections 1 by using temporary matching pieces, and matching the plurality of standard sections 1 into the steel box girder combined section.
Specifically, the two sets of slide rails 5 are driven to move to the designated position by starting the motor, and the blanking port 521 is located right above the installation position of the temporary matching member. At this time, the lowermost temporary matching member is stopped by the cylinder 7 and the electromagnet 71 and remains in the horizontal buffer section 52.
The L-shaped plate 6 is magnetically attracted and fixed through the electromagnet 71, then the cylinder 7 contracts, the temporary matching pieces are attracted to the blanking port 521, then the electromagnet 71 is powered off, the temporary matching pieces are released and vertically fall to corresponding mounting positions in a static state, and the two temporary matching pieces are respectively stuck to the corresponding assembly welding modules 11. Before the assembly welding module 11 and the corresponding L-shaped plate 6 are not completely fixed, a worker can finely adjust the position of the temporary matching piece in time to reduce errors, and then welding reinforcement is carried out on the assembly welding module 11 and the corresponding L-shaped plate 6.
The temporary matching pieces longitudinally move along with the sliding rail 5, and the blanking step is repeated, so that the temporary matching pieces between the adjacent assembly welding modules 11 and between the adjacent standard sections 1 are in place, and the overall installation efficiency of the temporary matching pieces is improved.
S3: transfer of the assembly welding module 11: and removing the connection of the temporary matching parts, leaving a group of standard sections 1 at the rearmost end of the jig frame 2, transferring the rest assembly welding modules 11 to the next construction area one by using a beam transporting vehicle, and moving the group of standard sections 1 at the rearmost end of the jig frame 2 to the front end of the jig frame 2.
S4: and repeating the S2 and the S3 to finish the block prefabrication construction of the steel box girder.
After the steel box girder block prefabrication construction is completed, the assembly welding modules 11 are transferred to the bridge deck, standard sections 1 are assembled on the bridge deck, and then the whole construction of the bridge deck steel box girder is carried out.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A cable-stayed bridge segment steel box girder block prefabricating construction method is characterized by comprising the following steps: the method comprises the following steps:
s1: construction preparation: dividing the standard segment (1) into three assembling and welding modules (11) transversely for manufacturing, manufacturing temporary matching pieces, and erecting a jig frame (2) in a pre-splicing field;
s2: pre-splicing steel box girders: sequentially hoisting three assembly welding modules (11), transversely placing the three assembly welding modules (11) on a jig frame (2) and aligning to complete the positioning step of a group of standard segments (1) to be assembled; circularly carrying out the step of positioning the standard sections (1) to be assembled, matching the three assembling and welding modules (11) into the standard sections (1) by using temporary matching pieces, and matching the plurality of standard sections (1) into the steel box girder combined section;
s3: transfer of assembly welding module (11): the connection of the temporary matching parts is removed, a group of standard sections (1) at the rearmost end of the jig frame (2) are left, the remaining assembly welding modules (11) are transported to the next construction area one by utilizing a beam transporting vehicle, and the group of standard sections (1) at the rearmost end of the jig frame (2) are moved to the front end of the jig frame (2);
s4: and repeating the step S2 and the step S3 to finish the block prefabrication construction of the steel box girder.
2. The cable-stayed bridge section steel box girder block prefabricating construction method according to claim 1, characterized in that: in the S1, mounting seats (21) are respectively mounted on two sides of a jig frame (2), the upper ends of the two mounting seats (21) are connected with sliding rails (5) in a sliding mode, and the sliding rails (5) are used for connecting temporary matching pieces; the two sliding rails (5) are respectively arranged obliquely downwards towards the trisection point of the standard segment (1).
3. The cable-stayed bridge section steel box girder block prefabrication construction method according to claim 2, characterized in that: slide rail (5) are including slope storage section (51) and horizontal buffer section (52), horizontal buffer section (52) are located the slope lower extreme of slope storage section (51), horizontal buffer section (52) are provided with blanking mouth (521), blanking mouth (521) are located the trisection point of standard festival section (1) directly over.
4. The cable-stayed bridge section steel box girder block prefabrication construction method according to claim 3, characterized in that: the temporary matching piece comprises two L-shaped plates (6), the two L-shaped plates (6) correspond to two adjacent assembly welding modules (11) one by one, and the two L-shaped plates (6) are mutually attached and fixed through bolts (63); in the S2, the temporary matching piece falls to the splicing position of the adjacent assembly welding modules (11) through the slide rail (5) to be in place, and then the two L-shaped plates (6) of the temporary matching piece are respectively fixed on the upper surfaces of the corresponding assembly welding modules (11); and in the step of unlocking the temporary matching piece in the step S3, the bolt (63) between the two L-shaped plates (6) is taken out so as to release the connection of the adjacent assembly welding modules (11).
5. The cable-stayed bridge section steel box girder block prefabrication construction method according to claim 4, characterized in that: the L-shaped plate (6) comprises vertical plates (61) and transverse plates (62) which are perpendicular to each other, in the same temporary matching piece, the two vertical plates (61) are mutually abutted, and the two transverse plates (62) are spliced into a square bottom plate adaptive to the width of the slide rail (5); in the S1, the temporary matching pieces are stored in an inclined storage section (51) of the sliding rail (5), the structures of the temporary matching pieces used between the adjacent assembly welding modules (11) and the structures of the temporary matching pieces used between the adjacent standard sections (1) are the same, and in the inclined storage section (51), one temporary matching piece used between the adjacent standard sections (1) is arranged every two temporary matching pieces used between the adjacent assembly welding modules (11); in S2, the sliding rails (5) move longitudinally and release the temporary matching pieces one by one.
6. The cable-stayed bridge section steel box girder block prefabrication construction method according to claim 5, characterized in that: the slope lower extreme of slide rail (5) is provided with cylinder (7), cylinder (7) tip is provided with electro-magnet (71), L template (6) are the iron plate, in S2, remove the in-process to the assigned position in slide rail (5), electro-magnet (71) circular telegram and inhale fixedly to L template (6) magnetism, when slide rail (5) are taken one' S place in the assigned position, cylinder (7) shrink to inhale to blanking mouth (521) department with interim matching piece through electro-magnet (71), during the blanking, electro-magnet (71) outage to release interim matching piece, interim matching piece falls to corresponding mounted position perpendicularly.
7. The cable-stayed bridge section steel box girder block prefabrication construction method according to claim 6, characterized in that: the bottom of the sliding rail (5) is provided with a through groove (512), the through groove (512) extends along the length direction of the sliding rail (5) and is communicated with a blanking port (521), in the S1, the bottom of the transverse plate (62) is coated with a bonding agent, and the position of the through groove (512) is located right below the bonding agent coating position.
8. The cable-stayed bridge section steel box girder block prefabrication construction method according to claim 7, characterized in that: slide rail (5) slope upper end is fixed with slider (511), slider (511) sliding connection is in mount pad (21) top, mount pad (21) top is vertical to be rotated and is connected with screw rod (4), slider (511) are run through to screw rod (4) screw thread, mount pad (21) are installed and are ordered about screw rod (4) pivoted driving piece (3).
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|---|---|---|---|
| CN202211442099.1A CN115679835A (en) | 2022-11-17 | 2022-11-17 | Block-by-block prefabricating construction method for steel box girder of cable-stayed bridge segment |
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| CN202211442099.1A CN115679835A (en) | 2022-11-17 | 2022-11-17 | Block-by-block prefabricating construction method for steel box girder of cable-stayed bridge segment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117488700A (en) * | 2023-12-28 | 2024-02-02 | 中铁四局集团有限公司 | Steel box girder assembly jig frame structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117488700A (en) * | 2023-12-28 | 2024-02-02 | 中铁四局集团有限公司 | Steel box girder assembly jig frame structure |
| CN117488700B (en) * | 2023-12-28 | 2024-04-12 | 中铁四局集团有限公司 | Steel box girder assembly jig frame structure |
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