Integral manufacturing method of large-section split steel box girder

Abstract

Provided is a method for manufacturing a large-section split steel box girder as a whole, which includes adjusting the height of the frame support plate on the general assembly frame; positioning and assembling the bottom plate unit for welding; assembling and welding the diaphragm unit and the web unit; assembling and welding the top plate unit, the nozzle block, and the cross beam block; pre-assembling adjacent beam sections and installing matching parts; selecting two beam transport flat cars to synchronously transport the steel box girder according to the stress condition of the steel box girder; setting fulcrums to store the beam according to the stress condition of the steel box girder; and using a special hoist to hoist the entire steel box girder segment. The present invention effectively controls the overall dimensional accuracy and connection accuracy of the split steel box girder; and effectively avoids deformation of the steel box girder; ensures the connection accuracy between adjacent steel box girder segments connected on site, and is suitable for promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of manufacturing steel box girders for fixed building bridges, and in particular relates to an integral manufacturing method for a large-section split steel box girder. Background Art

[0002] Steel box girders are a commonly used bridge structure in large-span steel bridge projects. They are widely used in areas such as crossing rivers, seas, and mountain canyons, and have been manufactured on a large scale in recent years.

[0003] The current production and manufacturing of split steel box girders is subject to factors such as manufacturing and storage space, hoisting equipment capacity, and transportation equipment capacity. Large-section split steel box girders are mostly manufactured in sections, that is, the left and right sections and cross beams of the steel box girder segments are manufactured in the factory, and the left and right sections and cross beams of the steel box girder are hoisted separately at the bridge site, and the interface annular seams are welded. The section-by-section hoisting of the same beam section is bound to increase the difficulty of accurate positioning of the steel box girder at the bridge site. In this regard, the following technical solution is proposed. Summary of the invention

[0004] The technical problem solved by the present invention is to provide an integral manufacturing method for a large-section split steel box girder, thereby solving the technical problem that the overall dimensional accuracy and connection accuracy of the split steel box girder are difficult to control.

[0005] The technical solution adopted by the present invention is a method for integrally manufacturing a large-section split steel box girder, comprising the following steps:

[0006] Step 1: Adjust the height of the tire frame support plate on the overall tire frame according to the longitudinal line shape and cross slope of the actual bridge;

[0007] Step 2: Based on the measurement control network and the plate unit baseline, position, assemble and weld the bottom plate unit, and fix the bottom plate unit and the bottom plate point of the tire frame support plate as one;

[0008] Step 3: Weld the diaphragm element and the web element according to the plate element baseline and line shape;

[0009] Step 4: Use the measurement control network and plate unit baseline to weld the top plate unit, the nozzle block, and the beam block;

[0010] Step 5: According to the actual bridge line shape, pre-assemble adjacent beam segments and install matching parts to ensure accurate matching and positioning of steel box beam segments at the bridge site;

[0011] Step 6: According to the stress condition of the steel box girder, choose to use two beam transport flat cars to transport the steel box girder synchronously to avoid distortion of the steel box girder section;

[0012] Step 7: Set the support beam storage according to the stress condition of the steel box beam. Each section of the steel box beam is stored with a support. The support beam storage is mainly located at the diaphragm position and the corner reinforcement position;

[0013] Step 8: Use special lifting equipment to complete the lifting of the steel box girder segment.

[0014] In the above technical solution, further: the measurement and control network is composed of a longitudinal measurement tower, a longitudinal control network and a transverse measurement tower, and a transverse control network.

[0015] In the above technical solution, further: the web unit includes an inner web unit and an outer web unit.

[0016] In the above technical scheme, further: the beam transport flat car has casters and brackets; the brackets have two groups; each group of brackets is provided with two groups of casters at the front and rear of the bottom; the two groups of brackets are respectively located at the center of gravity on the left and right sides of the steel box beam, and the two groups of brackets are respectively extended along the longitudinal direction of the steel box beam.

[0017] In the above technical scheme, further: the special hoist has a horizontal straight-line hanger; a plurality of inclined lifting points are evenly distributed on the left and right sides of the top of the hanger; a plurality of vertical lifting points are evenly distributed on the left and right sides of the bottom of the hanger; the inclined lifting points are centrally lifted by at least four inclined lifting ropes at the mid-vertical position of the hanger; the vertical lifting points are horizontally lifted by at least eight vertical lifting ropes. Steel box girders are lifted horizontally.

[0018] In the above technical solution, further: it also includes a steel box girder storage rack; the steel box girder storage rack has piers and pallets; there are at least eight piers; there are at least two groups of pallets; the pallets are located at the bottom of the steel box girder; each group of pallets has at least four piers at the bottom.

[0019] The advantages of the present invention compared with the prior art are:

[0020] 1. The present invention effectively controls the overall dimensional accuracy and connection accuracy of the split steel box girder by setting a tire frame that controls the geometric dimensional accuracy and determining an overall assembly control method.

[0021] 2. The present invention realizes the integral manufacturing, transportation, storage and hoisting of the large-section split steel box girder. Through stability calculation, it is determined that the force support points for storage and hoisting of the beam sections will not cause deformation of the steel box girder.

[0022] 3. The special hoist of the present invention not only improves the overall manufacturing accuracy of the steel box girder, reduces the number of hoisting times and welding workload at the bridge site, but also ensures the connection accuracy between adjacent steel box girder segments during on-site connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the integrally assembled tire frame of the large-section steel box girder of the present invention;

[0024] Figure 2 This is the main view of the positioning of the bottom plate of the large-section steel box beam of the present invention;

[0025] Figure 3 This is a flow chart for the overall production of a large-section steel box girder according to the present invention;

[0026] Figure 4 This is a front view of the beam transport flat car of the present invention;

[0027] Figure 5 This is a top view of the beam transport flat car of the present invention;

[0028] Figure 6 Storing a front view of the steel box girder of the present invention;

[0029] Figure 7 for Figure 6 Top view of steel box girder storage;

[0030] Figure 8 It is a three-dimensional diagram of the special sling of the present invention;

[0031] Fig. 9 This is a diagram showing the use status of the special lifting device of the present invention;

[0032] Fig.10 This is a front view of the lifting point position of the steel box girder of the present invention;

[0033] Fig.11 For the present invention Fig.10 Top view of the steel box girder lifting point position;

[0034] In the figure: 1-longitudinal alignment of the bridge, 2-cross slope, 3-tire support plate, 4-measurement control network, 41-longitudinal measurement tower, 42-longitudinal control network, 43-transverse measurement tower, 44-transverse control network; 5-plate unit baseline, 6-bottom plate unit, 7-diaphragm unit, 8-web unit, 81-inner web unit, 82-outer web unit; 9-top plate unit, 10-nozzle block, 11-cross beam block, 12-adjacent beam section, 13-beam transport flat car, 131-castor, 132-bracket; 14-fulcrum storage beam, 15-special lifting device, 151-hanging bracket, 152-inclined lifting point, 153-vertical lifting point, 154-inclined lifting rope, 155-vertical lifting rope; 16-steel box beam storage rack, 161-pier, 162-pallet. DETAILED DESCRIPTION

[0035] The following will be combined with the attached embodiment of the present invention Figure 1-11 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] (like Figure 1, Figure 2 , Figure 3 A method for integrally manufacturing a large-section split steel box girder comprises the following steps:

[0037] Step 1: Adjust the height of the tire frame support plate 3 on the assembled tire frame according to the longitudinal line shape 1 and the transverse slope 2 of the actual bridge.

[0038] (like Figure 1 As shown in the above embodiment, further: the measurement and control network 4 is composed of a longitudinal measurement tower 41, a longitudinal control network 42 and a transverse measurement tower 43 and a transverse control network 44.

[0039] That is, a large steel box girder overall assembly frame is designed, and four longitudinal measurement towers 41 and one transverse measurement tower 43 are used to establish a four-longitudinal and one-transverse measurement control network 4 for the long-line method overall assembly and pre-assembly of the steel box girder.

[0040] Step 2: Based on the measurement control network 4 and the plate unit baseline 5, the bottom plate unit 6 is positioned, assembled and welded, and the bottom plate unit 6 is fixedly connected to the bottom plate point of the tire frame support plate 3. That is, the leveling point is measured according to the process of setting the actual bridge line shape of the steel box girder, which serves as the control point for the longitudinal line shape and transverse slope measurement of the entire steel box girder bridge deck.

[0041] Step 3: According to the plate unit baseline 5 and the linear assembly welding of the diaphragm unit 7 and the web unit 8, the steel box girder is manufactured, and the plate unit components of the steel box girder are manufactured.

[0042] (like Figure 3 As shown in the above embodiment, further: the web unit 8 includes an inner web unit 81 and an outer web unit 82.

[0043] Step 4: Use the measurement control network 4 and the plate unit baseline 5 to assemble and weld the top plate unit 9, the nozzle block 10, and the beam block 11.

[0044] That is, the overall assembly frame is used as the outer tire and the diaphragm unit is used as the inner tire. According to the actual bridge line shape of the steel box girder, the "long line method" is used to carry out "9+1" overall continuous matching and manufacturing of the steel box girder segments, and the overall manufacturing and matching pre-assembly of 9 steel box girder segments are completed at one time. During the process, attention should be paid to controlling the positions of each measuring level point and the vertical and horizontal baselines.

[0045] Step 5: According to the actual bridge line shape, pre-assemble 12 adjacent beam segments and install matching parts to ensure the accurate matching and positioning of the steel box girder segments at the bridge site.

[0046] That is, according to the actual bridge line shape and the requirements for reserved welds on site at the bridge location, matching parts are installed to pre-assemble the steel box girder segments.

[0047] Step 6: According to the stress condition of the steel box girder, two beam transport flat cars 13 are selected to transport the steel box girder synchronously to avoid distortion of the steel box girder section.

[0048] Step 7: According to the stress condition of the steel box girder, support points for storing the beams 14 are set. Each section of the steel box girder is stored with 8 support points. The support points for storing the beams 14 are mainly set at the diaphragm position and the corner reinforcement position.

[0049] According to the structure and force of the entire steel box girder section, fulcrums for the transportation of the beam transport flat car and fulcrums for the storage of the beam section are set. After the fulcrum positions are qualified through stability calculations, the transportation and storage of the beam section are carried out.

[0050] Step 8: Use special lifting equipment 15 to lift the entire steel box girder segment.

[0051] Firstly: according to the structure of the entire steel box girder section and the stress conditions of hoisting, lifting points are set on the steel box girder bridge deck. The setting of lifting points ensures that the steel box girder will not be deformed or twisted due to lifting.

[0052] Secondly: design a set of special lifting equipment for lifting large steel box girders to ensure the smooth lifting of large-section steel box girders.

[0053] Compared with the background technology, the present invention has formed a large-section split steel box girder overall manufacturing, transportation, storage, and hoisting technology. This technology is the first to manufacture, transport, store, and hoist the entire split steel box girder. Through stability calculation, it is determined that the force support points set for beam segment storage and hoisting will not cause deformation of the steel box girder. Research on technical means such as designing special hoists has not only improved the overall manufacturing accuracy of the steel box girder, reduced the number of hoisting times and welding workload at the bridge site, but also ensured the connection accuracy between adjacent steel box girder segments during on-site connection.

[0054] (like Figure 4 , Figure 5 In the above embodiment, further: the beam transport flat car 13 has casters 131 and brackets 132; the brackets 132 have two groups; each group of brackets 132 has two groups of casters 131 at the front and back of the bottom; the two groups of brackets 132 are respectively located at the center of gravity on the left and right sides of the steel box beam, and the two groups of brackets 132 are respectively extended along the longitudinal direction of the steel box beam.

[0055] (like Figure 8 , Fig. 9As shown in the above embodiment, further: the special hoist 15 has a horizontal straight-line hanger 151; a plurality of inclined lifting points 152 are evenly distributed on the left and right sides of the top of the hanger 151; a plurality of vertical lifting points 153 are evenly distributed on the left and right sides of the bottom of the hanger 151; the inclined lifting points 152 are centrally lifted by at least four inclined lifting ropes 154 at the midpoint of the vertical line of the hanger 151; the vertical lifting points 153 are horizontally lifted by at least eight vertical lifting ropes 155.

[0056] (like Figure 6 , Figure 7 As shown in the above embodiment, further: it also includes a steel box girder storage rack 16; the steel box girder storage rack 16 has piers 161 and pallets 162; the piers 161 have at least eight; the pallets 162 have at least two groups; the pallets 162 are arranged at the bottom of the steel box girder; at least four piers 161 are arranged at the bottom of each group of pallets 162.

[0057] From the above description, it can be found that the present invention effectively controls the overall dimensional accuracy and connection accuracy of the split steel box girder by setting a tire frame that controls the geometric dimensional accuracy and determining an overall assembly control method.

[0058] The present invention realizes the integral manufacturing, transportation, storage and hoisting of a large-section split steel box girder, and through stability calculation, it is determined that the force bearing fulcrums for storing and hoisting the beam sections will not cause deformation of the steel box girder.

[0059] The special hoist of the present invention not only improves the overall manufacturing accuracy of the steel box girder, reduces the number of hoisting times and welding workload at the bridge site, but also ensures the connection accuracy between adjacent steel box girder segments during on-site connection.

[0060] In summary, the present invention solves the technical problem that the overall dimensional accuracy and connection accuracy of the split steel box girder are difficult to control. The overall dimensional accuracy and connection accuracy of the split steel box girder are effectively controlled; the steel box girder is prevented from deformation; and the connection accuracy between adjacent steel box girder segments is ensured on-site, which is suitable for promotion.

[0061] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for integrally manufacturing a large-section split steel box girder, characterized in that: The steps include: Step 1: on the assembled tire frame, adjust the height of the tire frame support plate (3) according to the longitudinal line shape (1) and the transverse slope (2) of the actual bridge; Step 2: Using the measurement control network (4) and the plate unit baseline (5) as reference, assemble and weld the bottom plate unit (6), and connect the bottom plate unit (6) and the bottom plate point of the tire frame support plate (3) as a whole; Step 3: welding the diaphragm plate element (7) and the web plate element (8) according to the plate element baseline (5) and the linear assembly; Step 4: Using the measurement control network (4) and the plate unit baseline (5), the top plate unit (9), the air nozzle block (10), and the beam block (11) are welded together; Step 5: Pre-assemble adjacent beam segments (12) according to the actual bridge line shape, and install matching parts to ensure accurate matching and positioning of the steel box beam segments at the bridge site; Step 6: According to the stress condition of the steel box girder, two beam transport flat cars (13) are selected to transport the steel box girder synchronously to avoid distortion of the steel box girder segment; Step 7: according to the stress condition of the steel box beam, support points for storing the beam (14) are set, and each section of the steel box beam is stored with 8 support points, and the support points for storing the beam (14) are mainly set at the position of the diaphragm and the position of the corner reinforcement; Step 8: Use a special lifting device (15) to lift the entire steel box girder segment; The measurement control network (4) is composed of a longitudinal measurement tower (41), a longitudinal control network (42), a transverse measurement tower (43), and a transverse control network (44); The beam transport flat car (13) has casters (131) and brackets (132); the brackets (132) have two groups; each group of brackets (132) is provided with two groups of casters (131) at the front and rear of the bottom; the two groups of brackets (132) are respectively arranged at the center of gravity of the left and right sides of the steel box beam, and the two groups of brackets (132) are respectively extended along the longitudinal direction of the steel box beam; The special hoist (15) has a horizontal straight-line hanger (151); a plurality of inclined suspension points (152) are evenly distributed on the left and right sides of the top of the hanger (151); a plurality of vertical suspension points (153) are evenly distributed on the left and right sides of the bottom of the hanger (151); the inclined suspension points (152) centrally lift the special hoist (15) at the mid-vertical position of the hanger (151) through at least four inclined suspension ropes (154); the vertical suspension points (153) horizontally lift the steel box girder through at least eight vertical suspension ropes (155); It also includes a steel box girder storage rack (16); the steel box girder storage rack (16) has piers (161) and pallets (162); there are at least eight piers (161); there are at least two groups of pallets (162); the pallets (162) are located at the bottom of the steel box girder; at least four piers (161) are provided at the bottom of each group of pallets (162).

2. The method according to claim 1, characterized in that: The web unit (8) includes an inner web unit (81) and an outer web unit (82).

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