A hoisting construction method for longitudinal and transverse small segments of wide steel box girders

Abstract

The present invention discloses a hoisting construction device and construction method for longitudinal and transverse small segments of a wide-span steel box girder. By using a temporary support and the transverse guide rail, longitudinal guide rail, cushion block, transverse through-type jack, longitudinal through-type jack and vertical jack installed on its top, the transverse through-type jack and the longitudinal through-type jack are respectively connected to the cushion block through threaded connecting rods. The vertical jack is installed between the top of the cushion block and the bottom of the steel box girder segment. By the action of the transverse through-type jack and the longitudinal through-type jack on the threaded connecting rods, the cushion block is driven to move along the transverse guide rail and the longitudinal guide rail, thereby realizing the transverse or longitudinal position adjustment of the steel box girder segment, and the height position adjustment of the steel box girder segment is realized through the vertical jack. It can solve the problems of large construction difficulty, high danger and low efficiency in the construction of existing wide-span steel box girders, and has high linear accuracy after the bridge is completed, and can well adapt to the complex and changeable urban viaducts.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering construction, and more specifically, to a longitudinal and transverse small-segment hoisting construction method for wide-span steel box girders. Background Art

[0002] With the rapid development of urban construction, traffic has become increasingly complex, and modern traffic has gradually shifted from planar traffic to three-dimensional traffic, with the importance of urban viaducts in modern traffic continuously increasing. Due to characteristics such as light self-weight, good overall performance, large torsional stiffness, simple installation, beautiful alignment, and large spanning capacity, steel box girders have been widely used in urban interchanges. At the same time, due to the increasing urban traffic pressure, wide-span steel box girders are often used in urban viaducts. The choice of construction method for wide-span steel box girder bridges not only determines the difficulty and safety during construction but also affects the alignment and overall mechanical properties of the bridge after completion.

[0003] Common construction methods for wide-span steel box girder bridges can generally be divided into: jacking method, cantilever erection method, hoisting method, etc. Traditional construction methods for wide-span steel boxes have relatively large defects. When using the jacking method for construction, it is only applicable to straight bridges with equal height or curved bridges with equal radius, while urban viaducts often adopt variable height and equal width cross-section forms; when using the cantilever erection method, due to the large cross-section of the wide-span steel box girder, if the segment is too long, the self-weight will be too large, requiring higher construction machinery, and if the segment is too short, the construction period will be too long; when using the integral hoisting method, due to the long segment, it will cause difficulties in segment transportation, and at the same time, the large self-weight of the segment will affect the safety and stability during hoisting; moreover, the above construction methods have relatively low precision in controlling the alignment of steel box girder segments during the construction process.

[0004] Therefore, designing a construction method for wide-span steel box girder bridges to ensure the installation accuracy of steel box girders, improve construction efficiency, and meet the construction progress requirements while satisfying technology and safety has become an urgent problem for those in the technical field. Summary of the Invention

[0005] The main object of the present invention is to provide a longitudinal and transverse small-segment hoisting construction method for wide-span steel box girders, aiming to solve the problems existing in the existing construction methods for wide-span steel box girder bridges.

[0006] To achieve the above object, the specific technical solution of the present invention is as follows:

[0007] A longitudinal and transverse small-section hoisting construction device for a wide-span steel box girder, including a steel box girder, and also including a temporary support. A cross-bridge guide rail, a longitudinal bridge guide rail, a cushion block and an adjusting device are installed on the top of the temporary support. A small section of the steel box girder is installed above the cushion block. The adjusting device includes a horizontal through-type jack, a longitudinal through-type jack and a vertical jack. The horizontal through-type jack and the longitudinal through-type jack are respectively connected to the cushion block through threaded connecting rods. The vertical jack is installed between the top of the cushion block and the bottom of the steel box girder section. By the action of the horizontal through-type jack and the longitudinal through-type jack on the threaded connecting rods, the cushion block is driven to move along the cross-bridge guide rail and the longitudinal bridge guide rail, so as to realize the horizontal or longitudinal position adjustment of the steel box girder section. The height position adjustment of the steel box girder section is realized by the vertical jack.

[0008] Further, a cross-shaped card slot is opened below the cushion block. The cross-bridge guide rail and the longitudinal bridge guide rail are matched with the cushion block through the card slot to realize the movement of the cushion block in the horizontal or longitudinal direction.

[0009] Further, the horizontal through-type jacks and the longitudinal through-type jacks are arranged in pairs and are respectively installed at both ends of the cross-bridge guide rail and the longitudinal bridge guide rail. The threaded connecting rods penetrate through the corresponding holes in the cushion block, and both ends of the threaded connecting rods are respectively connected to the horizontal through-type jacks or the longitudinal through-type jacks.

[0010] Another object of the present invention is to provide a longitudinal and transverse small-section hoisting construction method for a wide-span steel box girder based on the above-mentioned hoisting construction device, including the following steps:

[0011] Step 1: Complete the production and overall splicing of each unit component according to the design requirements in the factory, perform size correction and adjustment, transport the completed section to the construction area and conduct self-inspection on the production accuracy.

[0012] Step 2: Use a total station to review the construction coordinates, mark the plane position of the temporary support, complete the erection of the temporary support and check its stability.

[0013] Step 3: Install a cross-bridge guide rail, a cushion block, a vertical jack and a horizontal through-type jack on the top of the temporary support, pass the threaded connecting rod through the cushion block and connect it to the horizontal through-type jack.

[0014] Step 4: Move the crane to the construction area on one side of the existing line, install a lifting tool on the steel beam section and conduct a trial lift, and adjust the lifting position of the crane.

[0015] Step 5: Hoist the transverse segments of the steel girders under construction onto the vertical jacks of the temporary supports in sequence, check and verify the coordinates and elevations of each segment, adjust the elevation of each small segment through the vertical jacks, and adjust the transverse position of each segment through the transverse guide rails and transverse through jacks. After the elevation and transverse position are adjusted, remove the transverse guide rails and transverse through jacks.

[0016] Step 6: Install the longitudinal guide rails and longitudinal through jacks through the card slots reserved by the cushion blocks. Pass the threaded connecting rod through the cushion blocks and connect it to the longitudinal through jack, and adjust the longitudinal position of the segment through the longitudinal guide rails and longitudinal through jacks.

[0017] Step 7: After meeting the design requirements, the steel girder is in place, and the hoisted segment is connected and fixed to the already installed transverse segment of the steel girder by using temporary positioning connecting plates.

[0018] Step 8: After all the transverse segments of the beam under construction are in place and the positions are checked and verified, weld and fix them, then remove the cushion blocks and vertical jacks, and move the crane to construct the next beam segment.

[0019] Step 9: After the erection and installation of each span of the steel girder are completed and the quality inspection is qualified, some supports and jacks, etc. can be removed according to the design requirements, and the removed supports are transferred to the next continuous span.

[0020] Further, in the above Step 5, the hoisting sequence of each steel girder segment is as follows: longitudinally from west to east, that is, hoist the steel box girders in sequence from the small pile number to the large pile number; transversely, according to the crane position on site, select to hoist from the middle box chamber of the segmented part to both sides in sequence, that is, hoist transversely from the middle to both sides, and the two side flange plates are hoisted last. Hoist the steel girder segment to stop about 5 cm above the top surface of the temporary support, and then initially position the steel girder with reference to the previously released bottom edge line and center line of the steel girder, and then the crane continues to lower the hook to the installation position.

[0021] Further, in the above Step 5, after each transverse segment is hoisted, confirm the position of the transverse segment. Through the action of the transverse through jack on the threaded connecting rod, the cushion block slides along the transverse guide rail, thereby driving the movement of the steel box girder segment, so as to adjust the transverse position of the segment.

[0022] Further, in the above Step 6, the longitudinal guide rail is directly inserted into the card slot and fixed. Through the longitudinal through jack, the cushion block slides along the longitudinal guide rail, thereby driving the movement of the steel box girder segment, so as to adjust the longitudinal position of the segment.

[0023] Further, the transverse guide rail and the longitudinal guide rail are connected to the top of the temporary support through bolts at both ends. The vertical jack is installed on the cushion block through bolts at the lower part, and the upper part of the vertical jack is welded to the bottom of the steel box girder stage. The threaded connecting rod is selected to use precision rolled thread steel.

[0024] Before installation, the transverse guide rail, longitudinal guide rail and the card slots of the cushion blocks in the bridge direction should be coated with lubricating oil to reduce the friction between the two and lower the difficulty of segment movement.

[0025] Compared with the prior art, the beneficial effects of the present invention are reflected in:

[0026] The longitudinal and transverse small-segment hoisting construction method for wide-span steel box girders of the present invention can complete the adjustment of the transverse, longitudinal and vertical positions of the steel box girder segments, and when adjusting the transverse and longitudinal positions of the segments, along the preset guide rails, it can ensure that there is no great influence on other directions.

[0027] The longitudinal and transverse small-segment hoisting construction method for wide-span steel box girders of the present invention adjusts the positions of each longitudinal and transverse small segment through the guide rails, can achieve the accuracy of the segment positions, ensure the installation accuracy of the steel box girder, and ensure the alignment when the bridge is completed.

[0028] The longitudinal and transverse small-segment hoisting construction method for wide-span steel box girders of the present invention overcomes the deficiency that the jacking method is only applicable to straight bridges with equal height or curved bridges with equal radius, can well adapt to complex and changeable urban viaducts, and at the same time, this method has a lower requirement for the lifting capacity of the crane, reducing the construction difficulty.

[0029] Since the longitudinal and transverse small-segment hoisting construction method for wide-span steel box girders of the present invention adopts the form of longitudinal and transverse small-segment division, it can accelerate the prefabrication speed of components in the factory, improve the construction efficiency. At the same time, adopting the form of longitudinal and transverse small-segment division can reduce the transportation difficulty of the segments and the difficulty during the hoisting of each segment. Description of the Drawings

[0030] Figure 1 is the implementation flow chart of the method of the present invention;

[0031] Figure 2 is the structural diagram of the temporary support frame in the present invention;

[0032] Figure 3 is the transverse structural diagram in the present invention;

[0033] Figure 4 is the longitudinal structural diagram in the present invention

[0034] Figure 5 is the longitudinal segmentation diagram in the method of the present invention;

[0035] Figure 6 is the transverse segmentation diagram of the Z1 segment in the method of the present invention.

[0036] In the figure, 1 - column; 2 - cross brace; 3 - diagonal brace; 4 - distribution beam; 5 - transverse guide rail across the bridge; 6 - longitudinal guide rail along the bridge; 7 - cushion block; 8 - vertical jack; 9 - horizontal through jack; 10 - longitudinal through jack; 11 - threaded connecting rod; 12 - steel box girder segment. Specific embodiments

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present invention, and are not intended to limit the present invention.

[0038] Example 1, as Figure 2-4 shown,

[0039] A hoisting construction device for longitudinal and transverse small segments of a wide - width steel box girder includes a steel box girder and also includes a temporary support. A transverse guide rail across the bridge 5, a longitudinal guide rail along the bridge 6, a cushion block 7 and an adjusting device are installed on the top of the temporary support. A small segment of the steel box girder is installed above the cushion block 7. The adjusting device includes a horizontal through jack 9, a longitudinal through jack 10 and a vertical jack. The horizontal through jack 9 and the longitudinal through jack 10 are respectively connected to the cushion block 7 through threaded connecting rods 11. The vertical jack is installed between the top of the cushion block 7 and the bottom of the steel box girder segment 12. By the action of the horizontal through jack 9 and the longitudinal through jack 10 on the threaded connecting rod 11, the cushion block 7 is driven to move along the transverse guide rail across the bridge 5 and the longitudinal guide rail along the bridge 6, thereby realizing the adjustment of the transverse or longitudinal position of the steel box girder segment 12. The adjustment of the height position of the steel box girder segment 12 is realized through the vertical jack.

[0040] Among them, as Figure 2 shown, the temporary support frame is composed of a column 1, a cross brace 2, a diagonal brace 3 and a top distribution beam 4. High - strength bolts are used to connect between columns, between columns and web members, etc.

[0041] As Figure 3 、 4 shown, a cross - shaped card slot is opened below the cushion block 7. The transverse guide rail across the bridge 5 and the longitudinal guide rail along the bridge 6 are matched with the cushion block 7 through the card slot to realize the movement of the cushion block 7 in the transverse or longitudinal direction.

[0042] The horizontal through jack 9 and the longitudinal through jack 10 are arranged in pairs and are respectively installed at both ends of the transverse guide rail across the bridge 5 and the longitudinal guide rail along the bridge 6. The threaded connecting rod 11 passes through the corresponding holes in the cushion block 7, and its two ends are respectively connected to the horizontal through jack 9 or the longitudinal through jack 10. Example

[0043] As Figure 1 shown, a hoisting construction method for longitudinal and transverse small segments of a wide - width steel box girder includes the following steps:

[0044] Step 1: Complete the production and overall splicing of each unit component in the factory according to the design requirements, make size corrections and adjustments, transport the completed segments to the construction area, and conduct self-inspection of the production accuracy;

[0045] Step 2: Use the total station to check the construction coordinates, mark the plane position of the temporary support, complete the erection of the temporary support and check its stability;

[0046] Step 3: Install the transverse bridge guide rail 5, the cushion block 7, the vertical jack 8, and the transverse through-type jack 9 on the top of the temporary support along the transverse bridge direction, and pass the threaded connecting rod 11 through the cushion block 7;

[0047] Among them, Figure 3 As shown, before installation, the grooves of the cross-bridge guide rail 5 and the pad 7 should be filled with lubricating oil to reduce the friction between the two and reduce the difficulty of segment movement. The cross-bridge guide rail 5 is connected to the top distribution beam 4 of the bracket through bolts at both ends, and the pad 7 is connected to the cross-bridge guide rail 5 through the groove reserved at the bottom. The bottom of the vertical jack 8 is installed above the pad 7 by bolts, and the top of the vertical jack 8 is welded to the bottom of the steel box beam. The transverse through-type jack 9 is installed at both ends of the guide rail, and the threaded connecting rod 11 passes through all the pads 7 through the corresponding holes on the pads 7.

[0048] Step 4: Move the crane to the construction area on one side of the existing line, install the lifting device on the steel beam segment and conduct a trial lift, and adjust the lifting position of the crane;

[0049] Step 5: hoist the transverse sections of the constructed beam section onto the vertical jacks 8 of the temporary support in sequence, check the coordinates and elevation of each section, adjust the elevation of each small section by the vertical jacks 8, adjust the transverse position of each section by the cross bridge guide rails 5 and the transverse through-type jacks 9, and after the elevation and transverse position are adjusted, remove the cross bridge guide rails 5 and the transverse through-type jacks 9;

[0050] Among them, the hoisting sequence of each steel beam section is: from west to east in the longitudinal direction of the bridge, the steel box beam is hoisted in sequence from the small pile number to the large pile number, that is, Z1→Z2→Z3→Z4→Z5→Z6→Z7→Z8→Z9; in the transverse direction of the bridge, the middle box chamber of the segment is selected according to the position of the crane station on site, and the hoisting sequence is carried out to both sides in sequence, that is, the transverse direction is hoisted from the middle to both sides, and the flange plates on both sides are hoisted last. Taking the Z1 segment as an example, that is, Z1-3→Z1-4→Z1-5→Z1-6→Z1-1→Z1-2→Y1→Y9, each steel beam segment in Z1-1~Z1-6 and Y1, Y9 is stopped when it is hoisted to about 5cm above the top surface of the temporary support, and then the steel beam is initially positioned by referring to the edge line and center line of the bottom plate of the steel beam released in advance, and then the crane continues to drop the hook to the installation position. The hoisting diagram is as follows Figures 5-6 As shown;

[0051] As Figure 3 shown, after each transverse segment is hoisted, confirm the position of the transverse segment. Through the action of the transverse through-hole jack 9 on the threaded connecting rod 11 (precision rolled threaded steel), the cushion block 7 slides along the transverse guide rail 5 of the bridge, thereby driving the movement of the steel box girder segment 12, so as to adjust the transverse position of the segment. After the transverse position of the segment is adjusted, remove the fixed bolts, directly pull out the transverse guide rail 5 from the card slot and remove the transverse jack 9.

[0052] Step Six: Install the longitudinal guide rail 6 of the bridge through the card slot reserved by the cushion block 7, and adjust the longitudinal position of the segment through the longitudinal guide rail 6 and the longitudinal through-hole jack 10;

[0053] Among them, as Figure 4 shown, the longitudinal guide rail 6 of the bridge is directly inserted into the card slot and fixed at both ends with bolts. Through the action of the longitudinal jack 10 on the threaded connecting rod 11, the cushion block 7 slides along the longitudinal guide rail 6 of the bridge, thereby driving the movement of the small steel box girder segment 12, so as to adjust the longitudinal position of the segment. After the longitudinal position of the segment is adjusted, remove the longitudinal guide rail 6 and the jack 10.

[0054] Step Seven: After meeting the design requirements, the steel beam is in place, and the hoisted segment is connected and fixed to the installed transverse segment of the steel beam by using a temporary positioning connecting plate;

[0055] Step Eight: After all the transverse segments of the constructed beam segment are in place and the positions are rechecked, weld and fix them, remove the cushion block and the vertical jack, and move the crane to construct the next beam segment;

[0056] Among them, cut the welded part above the vertical jack 8, and remove the vertical jack 8 and the cushion block 7 together.

[0057] Step Nine: After the erection and installation of each span of the steel beam are completed and the quality inspection is qualified, some supports and jacks can be removed according to the design requirements, and the removed supports are transferred to the next connection.

[0058] Among them, when removing the transverse supports of the bridge, first remove the supports in the middle part, and then symmetrically remove them in both side directions. The removal should be carried out evenly. The removed supports are transferred to the next connection by forklift and re-assembled and installed according to the requirements.

[0059] Although the implementation of this invention patent has been disclosed above, it is not limited to the applications listed in the specification and the implementation. It can be fully applied to multiple fields applicable to this invention patent. For those familiar with this field, other modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, this invention patent is not limited to specific details and the illustrations shown and described here.

Claims

1. A construction method for hoisting longitudinal and transverse small segments of a wide - span steel box girder, including the steel box girder and temporary supports, characterized in that: On the top of the temporary support, a transverse bridge - direction guide rail, a longitudinal bridge - direction guide rail, a cushion block and an adjusting device are installed. Above the cushion block, a small segment of the steel box girder is installed. The adjusting device includes a transverse through - type jack, a longitudinal through - type jack and a vertical jack. The transverse through - type jack and the longitudinal through - type jack are respectively connected to the cushion block through threaded connecting rods. The vertical jack is installed between the top of the cushion block and the bottom of the steel box girder segment. By the action of the transverse through - type jack and the longitudinal through - type jack on the threaded connecting rods, the cushion block is driven to move along the transverse bridge - direction guide rail and the longitudinal bridge - direction guide rail, thereby realizing the adjustment of the transverse or longitudinal position of the steel box girder segment. The adjustment of the height position of the steel box girder segment is realized by the vertical jack; It also includes a hoisting construction method, which specifically includes the following steps: Step 1: According to the design requirements, complete the production and overall splicing of each unit part in the factory, carry out size correction and adjustment, transport the completed segment to the construction area and conduct self - inspection on the production accuracy; Step 2: Use a total station to review the construction coordinates, mark the plane position of the temporary support, complete the erection of the temporary support and check its stability; Step 3: Install a transverse bridge - direction guide rail, a cushion block, a vertical jack and a transverse through - type jack on the top of the temporary support. Pass the threaded connecting rod through the cushion block and connect it to the transverse through - type jack; Step 4: Move the crane to the construction area on one side of the existing line, install a lifting device on the steel beam segment and conduct a trial lift, and adjust the lifting position of the crane; Step 5: Sequentially hoist the transverse segments of the steel beam under construction onto the vertical jacks of the temporary support, review the coordinates and elevations of each segment. Adjust the elevation of each small segment through the vertical jack, and adjust the transverse position of each segment through the transverse bridge - direction guide rail and the transverse through - type jack. After the elevation and transverse position are adjusted, remove the transverse bridge - direction guide rail and the transverse through - type jack; Step 6: Install a longitudinal bridge - direction guide rail and a longitudinal through - type jack through the card slots reserved on the cushion block. Pass the threaded connecting rod through the cushion block and connect it to the longitudinal through - type jack, and adjust the longitudinal position of the segment through the longitudinal bridge - direction guide rail and the longitudinal through - type jack; Step 7: After meeting the design requirements, the steel beam is in place, and a temporary positioning connecting plate is used to connect and fix the hoisted segment to the already installed transverse segment of the steel beam; Step 8: After all the transverse segments of the beam under construction are in place and the positions are reviewed, weld and fix them, remove the cushion block and the vertical jack, and move the crane to construct the next beam segment; Step 9: After the erection and installation of each span of the steel beam are completed and the quality inspection is qualified, some supports and jacks can be removed according to the design requirements. The removed supports are transferred to the next connection; 2. The longitudinal and transverse small segment hoisting construction method for wide steel box girders according to claim 1, characterized in that, A cross - shaped card slot is opened below the cushion block. The transverse bridge - direction guide rail and the longitudinal bridge - direction guide rail are matched with the cushion block through the card slot to realize the movement of the cushion block in the transverse or longitudinal direction.

3. The longitudinal and transverse small segment hoisting construction method for wide steel box girders according to claim 1, characterized in that The transverse through jacks and longitudinal through jacks are arranged in pairs and are respectively installed at both ends of the transverse bridge guide rail and the longitudinal bridge guide rail. The threaded connecting rod passes through the corresponding holes in the cushion block, and its two ends are respectively connected to the transverse through jack or the longitudinal through jack.

4. A method for hoisting longitudinal and transverse small segments of a wide-span steel box girder according to claim 1, characterized in that, In the fifth step, the hoisting sequence of each steel beam segment is as follows: longitudinally from west to east, that is, the steel box girder is hoisted in sequence from the small pile number to the large pile number; transversely, according to the position of the crane on site, the hoisting sequence is from the middle box chamber of the segmented part to both sides, that is, transversely from the middle to both sides, and the two side flange plates are hoisted last. The steel beam segment is hoisted to about 5 cm above the top surface of the temporary support and then stopped. Then, with reference to the pre-released bottom edge line and center line of the steel beam, the steel beam is initially positioned, and then the crane continues to lower the hook to the installation position.

5. A construction method for longitudinal and transverse small segment hoisting of a wide-span steel box girder according to claim 1, characterized in that, In the fifth step, after each transverse segment is hoisted, the position of the transverse segment is confirmed. The transverse through jack acts on the threaded connecting rod to make the cushion block slide along the transverse bridge guide rail, thereby driving the steel box girder segment to move, so as to adjust the transverse position of the segment.

6. The longitudinal and transverse small segment hoisting construction method for a wide steel box girder according to claim 1, characterized in that, In the sixth step, the longitudinal bridge guide rail is directly inserted into the card slot and fixed. The longitudinal through jack makes the cushion block slide along the longitudinal bridge guide rail, thereby driving the steel box girder segment to move, so as to adjust the longitudinal position of the segment.

7. A longitudinal and transverse small segment hoisting construction method for a wide-span steel box girder according to claim 1, characterized in that, The transverse bridge guide rail and the longitudinal bridge guide rail are connected to the top of the temporary support by bolts at both ends. The vertical jack is installed on the cushion block by bolts at the bottom, and the vertical jack is welded to the bottom of the steel box girder stage at the top. The threaded connecting rod is preferably made of precision rolled threaded steel.

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