CN117328369A - Mounting method of combined box girder - Google Patents
Mounting method of combined box girder Download PDFInfo
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- CN117328369A CN117328369A CN202311617198.3A CN202311617198A CN117328369A CN 117328369 A CN117328369 A CN 117328369A CN 202311617198 A CN202311617198 A CN 202311617198A CN 117328369 A CN117328369 A CN 117328369A
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- box girder
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000009434 installation Methods 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims description 91
- 238000003466 welding Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 210000001503 joint Anatomy 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 13
- 238000001514 detection method Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000012360 testing method 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a method for installing a combined box girder, and belongs to the technical field of combined box girder installation. The installation method comprises the following steps: step Z10: arranging an underground concrete structure, arranging a tooling embedded part, installing guide rails and a jig frame, and respectively installing frame structures on two sides of the top of the underground concrete structure; step Z20: assembling at least one combined box girder on a jig frame, wherein the at least one combined box girder comprises a plurality of combined box girder sections, and a sliding device is arranged at the bottom of the at least one combined box girder; step Z30: sliding the at least one combined box girder to a horizontal preset position by utilizing a sliding device and a guide rail; step Z40: and a lifting device is arranged on the frame structure and the at least one combined box girder, and the at least one combined box girder is vertically lifted to a vertical preset position by utilizing the lifting device.
Description
Technical Field
The invention relates to the technical field of combined box girder installation, in particular to a combined box girder installation method.
Background
The steel structure building in China starts from the 80 s of the 20 th century, and after the 90 s of the 20 th century, the steel structure building is in a rapidly developing state under the support of the country. In recent years, steel construction has begun to be widely used in large-scale construction systems such as exhibition centers, stadiums, movie theaters, stations, and the like. Some frame structures break through the traditional limiting form of a large-span combined box girder frame structure, and the large-span combined box girder frame structure has the following characteristics: large span (e.g., 57m axial space span), high overhead (13 m below without remaining structure), heavy single component (e.g., 130 t), large single component cross section (e.g., "mouth" shape, 3.2m height, 1m width), etc. The length of each combined box girder after assembly and the reserved gaps of the brackets at the two sides are only the width of the welding seam, the installation of each combined box girder is required to be measured and positioned, and the precision requirement of the box type interface is very high. The traditional construction scheme has the following defects: the number of temporary supports is large, the difficulty in selecting a steel structure construction scheme is large, the construction safety risk factors are more, the quality control difficulty is large, and the like.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a method for installing a combined box girder, which solves the construction problems of horizontal transportation and vertical installation under the condition that the combined box girder is large in size and weight and is installed in a lifting manner without using a tower crane.
In one embodiment of the present invention, there is provided a method of installing a composite box girder, the method comprising the steps of: step Z10: arranging an underground concrete structure, arranging a tooling embedded part, installing guide rails and a jig frame, and respectively installing frame structures on two sides of the top of the underground concrete structure; step Z20: assembling at least one combined box girder on a jig frame, wherein the at least one combined box girder comprises a plurality of combined box girder sections, and a sliding device is arranged at the bottom of the at least one combined box girder; step Z30: sliding the at least one combined box girder to a horizontal preset position by utilizing a sliding device and a guide rail; step Z40: a lifting device is arranged on the frame structure and the at least one combined box girder, and the at least one combined box girder is vertically lifted to a vertical preset position by utilizing the lifting device; wherein, in step Z10, the jig frame is disposed at one end of the frame structure, the guide rail is laid on the ground and the guide rail is extended from the jig frame parallel to the frame structure to the other end of the frame structure by a predetermined distance so that the composite box girder slides on the guide rail to a horizontal predetermined position; in step Z20, the at least one composite box girder is arched in advance, the arched form and deformation are determined, and the butt joint between the composite box girder sections is adjusted according to the deformation during assembly.
Further, in step Z20, when the at least one composite box girder is assembled, the roof returning bearing capacity of the underground concrete structure is calculated, arching is performed according to 1/1000, and the total length of the at least one composite box girder is controlled according to welding shrinkage.
Further, in step Z20, the at least one composite box girder is two composite box girders, and the secondary girder is connected between the two composite box girders.
Further, in step Z30, after the at least one composite girder is slid to a horizontal predetermined position, the sliding device is replaced with a letter steel.
Further, in step Z30, before the at least one composite box girder slides, anti-toppling devices are installed on two sides of the at least one composite box girder.
Further, in step Z30, the anti-toppling device includes anti-toppling brackets fixed on two sides of the at least one truss box girder and rollers mounted under the anti-toppling brackets.
Further, the at least one combined box girder is four combined box girders, in the step Z20, a first combined box girder and a second combined box girder are assembled on a jig frame, and sliding devices are arranged at the bottoms of the first combined box girder and the second combined box girder; in the step Z30, the first combined box girder is slipped to a horizontal preset position by utilizing a slipping device and a guide rail and then is temporarily fixed, the second combined box girder is slipped to a preset position and is temporarily fixed, and the first combined box girder and the second combined box girder are connected by utilizing a secondary girder; in the step Z40, lifting devices are arranged on the frame structure and the combined box girders, and the lifting devices are utilized to synchronously lift the first combined box girders and the second combined box girders to a vertical preset position without gaps; and repeating the steps Z20, Z30 and Z40, and connecting a secondary beam between the second and third combined box beams after the third and fourth combined box beams are assembled, slipped and synchronously lifted vertically without gaps to a vertical preset position.
Further, step Z40 further includes: before the at least one combined box girder is lifted, the anti-toppling device is removed.
Further, in step Z40, the lifting includes two stages of trial lifting and formal lifting.
Further, the installation method also comprises a step Z50 of integrally synchronizing and balancing the slow staged unloading.
Compared with the prior art, the method for installing the combined box girder ensures that the installation of the combined box girder frame structure is smoothly carried out, ensures the safety and the construction quality of the whole construction, and simultaneously plays an optimal role in the construction scheme. The technical scheme of the invention effectively solves the problems of more construction safety risk factors, high quality control difficulty and large temporary support quantity in the construction of a combined box girder frame structure in the prior art.
Drawings
FIG. 1 illustrates a front view of a composite box girder mounted on a frame structure according to an embodiment of the present invention;
FIG. 2 shows a perspective view of an underground concrete structure and tooling embedment of an embodiment of the invention;
FIG. 3 shows a perspective view of the top of an underground concrete structure of an embodiment of the invention;
FIG. 4 shows a perspective view of a jig and rail provided on top of an underground concrete structure according to an embodiment of the invention;
FIG. 5 shows a perspective view of a jig frame, rail and frame structure disposed on top of an underground concrete structure according to an embodiment of the invention;
FIG. 6 shows an enlarged perspective view of a jig and rail of an embodiment of the invention;
FIG. 7 is a perspective view showing the assembly of a first and a second composite box girder on a jig frame according to an embodiment of the present invention;
FIG. 8 is a perspective view showing the installation of a skidding apparatus at the bottom of a composite girder after two roof trusses have been assembled according to an embodiment of the present invention;
FIG. 9 shows an enlarged perspective view of a glide assembly of an embodiment of the invention;
FIG. 10 shows a perspective view of an anti-toppling device according to an embodiment of the present invention;
FIG. 11 is a perspective view showing a first composite girder being slid to a horizontal predetermined position in accordance with one embodiment of the present invention;
FIG. 12 is a perspective view showing a connection of secondary beams to a first and second composite box beam according to an embodiment of the present invention;
FIG. 13 shows a perspective view of a step of providing a lifting device on a frame structure and composite box girder in accordance with an embodiment of the present invention;
FIG. 14 shows a perspective view of a lifting frame, hydraulic ram and lifting lower anchor of a lifting device in accordance with an embodiment of the present invention;
FIG. 15 shows a perspective view of a lifting lug of a lifting device in accordance with an embodiment of the invention;
FIG. 16 illustrates a perspective view of a first and second composite box girder being lifted vertically simultaneously without gaps in accordance with an embodiment of the present invention;
FIG. 17 is a perspective view of a third and fourth composite box girder completing lifting according to one embodiment of the present invention;
FIG. 18 is a perspective view showing a third example of a third composite girder and a fourth composite girder connecting a secondary girder according to an embodiment of the present invention;
FIG. 19 is a perspective view showing the completion of lifting of a fifth to eleventh composite box girder according to an embodiment of the present invention;
FIG. 20 is a perspective view of an eleventh composite girder attached with small cantilever structures, according to an embodiment of the present invention;
fig. 21 shows a perspective view of an eleven-frame composite box girder according to an embodiment of the present invention in a completed installation.
The main reference numerals illustrate:
1-an underground concrete structure; 2-frame structure; 3-combining box girders; 4-a jig frame; 5-a guide rail; 6-an anti-toppling bracket; 7-jack; 8-a sliding device; 9-lifting frames; 10-a hydraulic cylinder; 11-lifting the lower anchor; 12-lifting the lifting lug; 13-a tool embedded part; 14-a roller; 15-anti-toppling device.
Detailed Description
The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprises" or its derivatives, such as "comprising," "including," or "having" and any variations thereof, etc., will be understood to cover a non-exclusive inclusion, such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein.
Exemplary embodiments according to the present disclosure will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, thicknesses of layers and regions are exaggerated for clarity, and identical reference numerals are used to denote identical devices, and thus descriptions thereof will be omitted.
As shown in fig. 1 and 21, the frame structure 2 of the large-span, high-altitude, large-section and overweight combined box girder 3 in the embodiment of the invention is a floor slab formed by at least one combined box girder 3 as a main stress structure. The combined box girder 3 frame structure 2 has the following characteristics: large span (axis space span is 57 m), high-altitude (no other structure exists below 13 m), large cross section (the cross section is in a shape like a Chinese character 'kou', 3000mm multiplied by 1000 mm), overweight (about 130t for a single frame), and the like, wherein the length of each combined box girder 3 after being assembled is only the width of a welding seam with reserved gaps of bracket legs at two sides. Preferably, the composite box girder 3 of the present embodiment is provided on top of the underground concrete structure 1. As shown in the drawing, a tool embedment 13 is provided in the underground concrete structure 1, and frame structures 2 are installed at both sides of the top of the underground concrete structure 1, respectively, for mounting the composite box girder 3 thereon. Preferably, as shown in fig. 1, after the installation is completed, both ends of the composite box girder 3 are fixed to brackets of the frame structure 2, respectively.
The steps of the installation method of the composite box girder 3 of the present application will be described in detail with reference to the accompanying drawings.
According to the present embodiment, referring to fig. 1 to 21, the installation method of the composite box girder 3 mainly includes the steps of: step Z10, setting a basement concrete structure and installing a tool embedded part 13, a jig frame 4, a guide rail 5 and a frame structure 2; step Z20, assembling the combined box girder 3; step Z30, sliding the combined box girder 3; and step Z40, lifting the combined box girder 3. Optionally, the method for installing the composite box girder 3 may further include: step Z50, unloading the combined box girder 3; and/or step Z60, removing the lifting device.
In step Z10 of the present embodiment, the underground concrete structure 1 is set and the tooling embedments 13 are arranged, then the jig frame 4 and the guide rail 5 are installed, and finally the frame structures 2 are installed at both sides of the top of the underground concrete structure 1, respectively.
Illustratively, as shown in fig. 2, the underground concrete structure 1 is set on the site while the tooling embedments 13 are installed. Then, the underground concrete structure 1 is capped. Fig. 3 shows the top of the underground concrete structure 1. Next, as shown in fig. 4 and 5, the jig frame 4, the guide rail 5 and the frame structure 2 are installed on top of the concrete structure. Specifically, as shown in fig. 6, the frame structure 2 is provided on both sides of the top of the concrete structure, the jig frame 4 is provided at one end of the frame structure 2, the guide rail 5 is laid on the ground, and a predetermined distance extends from the jig frame 4 parallel to the frame structure 2 toward the other end of the frame structure 2 so that the composite box girder 3 slides on the guide rail 5 to a horizontal predetermined position. The tooling embedded part 13 is mainly located right below the jig frame 4 and the guide rail 5, as shown in fig. 1 and 6.
In step Z20 of the present embodiment, at least one composite box girder 3 is assembled on the jig frame 4, and the sliding device 8 is installed at the bottom of the composite box girder 3 after the assembly is completed. The composite box girder 3 comprises a plurality of composite box girder segments. As shown in fig. 1, an exemplary 130t single composite box girder 3 is assembled in seven-segment composite box girder segments. The accuracy is controlled by the total station during installation, especially the accuracy of the arching value. Optionally, during installation, the roof-returning load capacity of the underground concrete structure 1 is calculated. The combined box girder 3 is arched in advance, the arch-forming form and deformation are determined, and the butt joint of two sections of parts of the combined box girder 3 is adjusted according to the deformation during assembly, so that the combined box girder 3 is lifted in place in a small gap. Illustratively, arching is performed at 1/1000 and the overall length of the assembly is controlled in accordance with weld shrinkage.
As shown in fig. 7, two composite box girders 3 are illustratively assembled on a jig frame 4. As shown in fig. 8, after the two composite box girders 3 are assembled, a sliding device 8 is installed at the bottom of the composite box girders 3. Specifically, as shown in fig. 9, the composite box girder 3 is lifted up by the jack 7, and then the slider 8 is installed at a position corresponding to the guide rail 5. The jack 7 may be a hydraulic jack 7 and is provided at a position corresponding to a beam column of the basement. The sliding device 8 is, for example, a structure such as a bracket, by means of which the combined box girder 3 is slid on the guide rail 5. The towing means comprise a wire rope or the like.
Optionally, in step Z20, the method may further include: after the assembly of the composite box girder 3 is completed, the anti-toppling devices 15 are installed at both sides of the composite box girder 3. Fig. 10 shows the installation of the anti-toppling device 15. The anti-toppling means 15 comprises an anti-toppling bracket 6 and rollers 14 to prevent the composite box girder 3 from tilting or toppling when slipping. The anti-toppling brackets 6 are fixed on both sides of the combined box girder 3. Specifically, the anti-toppling bracket is fastened and connected to the composite box girder 3 by the secondary girder connection plates of the sides of the composite box girder 3 using 8.8-stage large hexagonal bolts. The roller 14 is installed below the anti-toppling bracket 6 and supported on the ground. When the composite box girder 3 slides on the guide rail 5, the anti-toppling device 15 moves together with the composite box girder 3. In this way, a guarantee is provided for the safety problems such as anti-toppling of large-section installation.
Illustratively, step Z20 of the present embodiment may include the sub-steps of: installing a jig frame 4, installing an arch-forming negative differential plate and drawing a positioning line of a component of the combined box girder 3; assembling the components of the combined box girder 3 on the jig frame 4; measuring and correcting by using a total station; welding the components of the combined box girder 3; flaw detection is carried out on the assembled combined box girder 3; a sliding device 8 and an anti-toppling device 15 are installed. The assembly precision is higher, and the quality assurance is better. The assembly and detection are carried out simultaneously, so that the assembly problem can be found out in time, and the problems that the camber or the length does not meet the requirement, the precision does not reach the standard and the like are corrected in time.
In step Z30 of the present embodiment, at least one composite girder 3 is slid to a horizontal predetermined position using the sliding device 8 and the guide rail 5, and then a lifting device is installed on the frame structure 2 and the composite girder 3. The combined box girder 3 of each 130t is horizontally slid 22 m-112 m. Preferably, before the combined box girder 3 starts to slide, the levelness of the guide rail 5 can also be checked by using a level ruler, and the lower Fang Zimi of the guide rail 5 is checked for mortar filling condition to ensure the strength of the guide rail 5.
The sliding step of the two roof truss composite box girders 3 will be described below by way of example with reference to fig. 11 to 13. The first combined box girder 3 and the second combined box girder 3 are assembled on the jig frame 4. As shown in fig. 11, the first composite box girder 3 slides on the guide rail 5 to a horizontal predetermined position. Preferably, the first truss composite box girder 3 is temporarily fixed after being slid to a horizontal predetermined position. Preferably, the jack 7 is used to lift the combined box girder 3 and then the sliding device 8 is replaced by the I-shaped steel. For example, the I-steel may be a 200I-steel. As shown in fig. 12, the second composite box girder 3 is slid to a predetermined position and temporarily fixed, and then the first composite box girder 3 and the second composite box girder 3 are connected using the sub-girder. Preferably, both ends of the plurality of secondary beams are respectively fixed to the first combined box beam 3 and the second combined box beam 3. The secondary beams are parallel to each other, perpendicular to the first and second composite box beams 3, and connected between the first and second composite box beams 3, 3.
As shown in fig. 13 and 16, in step Z40 in the present embodiment, the anti-toppling device 15 is detached, a lifting device is provided on the frame structure 2 and the composite box girders 3, and at least one composite box girder 3 is lifted vertically to a vertical predetermined position by the lifting device. The disassembled anti-toppling device can be reused. Then, both ends of the composite box girder 3 are fixed to the frame structure 2, respectively. As shown in fig. 13, illustratively, the two composite girders 3 are disassembled with anti-toppling devices 15 (not shown) before being vertically lifted, and lifting devices are provided on the frame structure 2 and the composite girders 3. The lifting frame 9, the hydraulic cylinder 10, the lifting lower anchor 11 in fig. 14, and the lifting lug 12 in fig. 15 constitute a lifting device. Specifically, the lifting frame 9, the hydraulic cylinder 10, and the lifting lower anchor 11 are disposed at the upper portion of the frame structure 2, and the lifting lugs 12 are disposed at the top of the composite box girder 3. The position of the lifting device can be selectively installed according to the specific situation, as long as the lifting of the composite box girder 3 can be completed. As shown in fig. 16, preferably, two composite box girders 3 are vertically lifted to a vertical predetermined position with no gap. Preferably, the lifting process can be divided into two stages of trial lifting and formal lifting, and the position coordinates of the two stages are measured by using a total station to ensure that no-gap lifting is smoothly performed, and flaw detection is performed on welding of the lifting lug 12 to ensure firmness and reliability. The combined box girder 3 of the third and fourth truss is exemplarily also shown on the guide rail 5 in fig. 16.
Illustratively, step Z40 of the present embodiment includes the sub-steps of: disassembling the anti-toppling device 15; lifting devices are arranged on the upper part of the frame structure 2 and the top of the combined box girder 3; test lifting, for example about 5cm from the ground, and checking the device again; formally lifting, namely measuring the gap by using a total station, and vertically lifting the combined box girder 3 to a preset position; and adjusting, fixing and welding the combined box girder 3. The composite box girder 3 is lifted vertically by 13.5m, for example. Through the mode, the traditional complicated high-large support construction is eliminated, and meanwhile, the stability and the safety of the structure installation process are guaranteed.
As shown in fig. 17, for example, in the case where the composite box girder 3 is more than two girders, the operations of assembling, sliding, lifting, etc. of the composite box girder 3 are repeated. After the assembly, sliding and lifting of the third and fourth composite box girders 3, 3 are completed, a sub girder is connected between the second and third composite box girders 3, as shown in fig. 18. That is, when the composite box girder 3 is lifted to the vertical position and fixed, the sub-girders are connected between the adjacent composite box girders 3 without the sub-girders between the adjacent two composite box girders 3. In fig. 17 and 18, the fifth and sixth composite box girders 3, and the seventh and eighth composite box girders 3, 3 are also shown.
Illustratively, fig. 19 shows the assembly, sliding and lifting of the fifth, sixth, seventh, eighth, ninth, tenth and eleventh composite box girder 3 completed. Fig. 20 shows the final assembled box girder 3 with small overhanging structures (not shown) attached to it. Fig. 21 shows the structure of the assembled eleven-frame composite box girder 3.
In this embodiment:
the combined box girder 3 has the specification height of 3200mm, the width of 1000mm, the maximum plate thickness of 50mm, the web thickness of 25mm, and longer butt joint vertical joints of the webs, so that the welding stress deformation is less, and the welding is performed simultaneously from bottom to top according to the length of 500 mm-700 mm.
Optionally, after the assembled box girder 3 is completed, the shape and the geometric dimensions of the structural members of the assembled box girder 3 are checked, and if the deviation is out of specification, the adjustment is performed before the lifting.
Optionally, before slipping, the anti-toppling device 15 is checked for installation stability, flatness of the guide rail 5, slipping position marks, traction steel wire ropes, electric hoists, lifting lugs and the like, and auxiliary small-sized machine tools or components are matched for self-checking and safety measure setting.
Optionally, step Z40 may further include lifting preparation:
(1) Before lifting, a center line of an installation position is arranged at the bracket, the beam top and the column top of the frame structure 2;
(2) Before lifting, checking the specification, the size, the connection mode, the welding line and the specification, the position, the welding line, the verticality and the lateral bending deviation of the lifting frame 9 and the installation and safety measure setting conditions of a pipeline dredging frame at the top of the lifting frame 9 shown in fig. 14;
(3) After the assembly and welding are completed and the combined box girder 3 slides in place, a hydraulic control system and a hoisting cable steel strand are synchronously installed, pre-tightening is carried out after the installation is completed, the loosening condition of the steel strand and the close contact condition of a clamping piece and an anchorage device are checked, each steel strand is guaranteed to bear force, and meanwhile the control element of the hydraulic synchronous system is detected to be normal.
Optionally, step Z40 may further comprise the sub-steps of:
(1) When the lifting operation is started, the lifting rope is synchronously loaded according to 10%, 20%, 50%, 60%, 80%, 90%, 95% and 100% steps until the lifting rope completely leaves the guide rail 5; meanwhile, the deformation of the combined box girder 3 and the lifting frame 9 is observed, the combined box girder 3 is ensured to be completely separated from the guide rail 5 in the tensioning process of the steel strands, and after the steel strands are separated from the frame by 5cm, standing is stopped for 1h, and the line shape of the combined box girder 3 is measured and adjusted to meet the requirement; checking whether the important parts of the whole lifting system have abnormal phenomena or not;
(2) After checking that the whole lifting system has no abnormal condition, the lifting jack 10 keeps the tension force not to change and pulls the lifting rope upwards, so that the two combined box girders 3 are lifted upwards;
(3) After lifting in place, the ideal closure line shape is adjusted, then closure is carried out, and butt joint fracture of the two combined box girders 3 is welded, so that the combined box girders 3 are permanently closed.
Optionally, in this embodiment, the installation method of this embodiment may further include a step Z50 unloading step, where the overall unloading is synchronized and balanced slowly in stages.
Optionally, step Z50 may include an unload preparation:
(1) Obtaining the maximum counter force, the unloading capacity and the horizontal displacement in the unloading process of each unloading point through simulation analysis so as to provide theoretical data;
(2) The combined box girder 3 is completely installed, welding work at all positions is required to be completed, welding line flaw detection personnel are required to detect the flaw of the welding line, the quality of the welding line meets the design requirement, and the welding line is inspected and accepted by quality inspection and the whole structure is stable and then is unloaded;
(3) Removing temporary components irrelevant to the structure, such as a cable rope, a tool ear plate or a locating plate, and the like, which are used for temporarily fixing the structure;
(4) Before unloading, the stability of the structure is monitored by a measuring instrument, so that the structure is unloaded under the condition that no relative displacement occurs repeatedly in the horizontal and vertical directions.
Optionally, step Z50 may further comprise the sub-steps of:
(1) Before unloading, quality check work is required to be carried out on the welding seams of the main body structure in the unloading area, so that welding missing and unqualified welding quality are avoided;
(2) Observing the load at each load point;
(3) During unloading, a measurement control point is set. And stopping unloading when the monitoring result has larger deviation from the theoretical analysis result.
Optionally, the installation method of the present embodiment may further include, in each step:
(1) The lifting and unloading processes are synchronously and slowly carried out;
(2) Checking after the lifting and unloading steps are completed;
(3) Lifting or unloading is synchronously carried out;
(4) And calculating an actual final sedimentation value through measurement before lifting and unloading and after lifting and unloading, comparing the actual final sedimentation value with a theoretical value, and reporting an early warning if the final lifting and unloading amount exceeds 50% of the theoretical value, and then, searching out a reason at the moment, and continuing lifting and unloading.
Optionally, the installation method of the present embodiment may further include performing measurement monitoring during execution of the installation method: and monitoring the structure of the combined box girder 3 and the steel columns at the two sides, performing deformation monitoring at the positions with larger stress and larger deformation through construction simulation calculation, and measuring the actual values of the displacement of the plane x and y and the displacement of the vertical step Z.
Optionally, the installation method of the present embodiment may further include a step Z60 of disassembling the jig frame, the guide rail, and the lifting device, as shown in fig. 21. The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. A method of installing a composite box girder (3), characterized in that the method comprises the steps of:
step Z10: arranging an underground concrete structure (1) and arranging a tooling embedded part (13), installing a guide rail (5) and a jig frame (4), and respectively installing frame structures (2) on two sides of the top of the underground concrete structure (1);
step Z20: assembling at least one combined box girder (3) on a jig frame (4), wherein the at least one combined box girder (3) comprises a plurality of combined box girder sections, and a sliding device (8) is arranged at the bottom of the at least one combined box girder (3);
step Z30: the sliding device (8) and the guide rail (5) are utilized to slide the at least one combined box girder (3) to a horizontal preset position;
step Z40: lifting devices are arranged on the frame structure (2) and the at least one combined box girder (3), and the at least one combined box girder (3) is vertically lifted to a vertical preset position by the aid of the lifting devices;
wherein, in step Z10, the jig frame (4) is arranged at one end of the frame structure (2), the guide rail (5) is laid on the ground and the guide rail (5) is extended from the jig frame (4) parallel to the frame structure (2) to the other end of the frame structure (2) by a predetermined distance so that the composite box girder (3) slides on the guide rail (5) to a horizontal predetermined position;
in the step Z20, the at least one combined box girder (3) is arched in advance, the arch-forming form and deformation are determined, and the butt joint between the combined box girder sections is adjusted according to the deformation during assembly.
2. The method according to claim 1, wherein in step Z20, the at least one composite girder (3) is arched by 1/1000 and the total length of the at least one composite girder (3) is controlled according to welding shrinkage.
3. The installation method according to claim 1, characterized in that in step Z20 the at least one composite box girder (3) is two composite box girders (3), the secondary girders being connected between the two composite box girders (3).
4. The method according to claim 1, wherein in step Z30, the skidding means (8) is replaced with i-steel after the at least one composite girder (3) has been slipped to a horizontal predetermined position.
5. The mounting method according to claim 1, wherein in step Z30, anti-toppling devices (15) are mounted on both sides of the at least one composite box girder (3) before the at least one composite box girder (3) is slipped.
6. The method according to claim 5, wherein in step Z30, the anti-toppling means (15) comprises anti-toppling brackets (6) fixed to both sides of the at least one roof truss and rollers (14) mounted below the anti-toppling brackets (6).
7. The method according to claim 3, wherein the at least one composite box girder (3) is a four-component composite box girder (3),
in the step Z20, a first combined box girder (3) and a second combined box girder (3) are assembled on a jig frame (4), and a sliding device (8) is arranged at the bottoms of the first combined box girder (3) and the second combined box girder (3);
in the step Z30, the first combined box girder (3) is slipped to a horizontal preset position by utilizing a slipping device (8) and a guide rail (5) and then is temporarily fixed, the second combined box girder (3) is slipped to the preset position and is temporarily fixed, and the first combined box girder (3) and the second combined box girder (3) are connected by utilizing a secondary girder;
in the step Z40, lifting devices are arranged on the frame structure (2) and the combined box girder (3), and the first combined box girder (3) and the second combined box girder (3) are lifted to a vertical preset position by using the lifting devices synchronously without gaps;
and repeating the steps Z20, Z30 and Z40, and connecting the secondary beams between the second combined box beam (3) and the third combined box beam (3) after the third combined box beam (3) and the fourth combined box beam (3) are assembled, slipped and synchronously lifted vertically without gaps to a vertical preset position.
8. The method of installing according to claim 5, wherein step Z40 further comprises: before the at least one combined box girder (3) is lifted, the anti-toppling device (15) is removed.
9. The method of installation according to claim 1, wherein in step Z40, the lifting comprises two stages of trial lifting and formal lifting.
10. The installation method according to claim 1, characterized in that it further comprises a step Z50 of globally synchronized and balanced slow staged unloading.
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| CN202311617198.3A CN117328369A (en) | 2023-11-30 | 2023-11-30 | Mounting method of combined box girder |
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