work progress
Construction started in June 2004 +065438+ 10, and it is planned to be completed in 2006.
geographical position
Binzhou Yellow River Highway Bridge is located 3.3 kilometers downstream of Binzhou Yellow River Highway Bridge on National Highway 205. The south bank starts from Huangwangzhuang, Caizhai Township, Boxing County, Shandong Province, and the north bank is Dagaojia, Cai Liang Township, Bincheng District, Binzhou City.
This bridge is the first highway-railway bridge on the Yellow River. Its railway function is the control project of the new national secondary railway Xiaoying-Binzhou line. The railway extends northward from Xiaoying Station of Boxing-Xiaoying Line, across the Yellow River to Bincheng District of Binzhou City, with a total length of 18.45km. The line connects Ji Jiao Railway in the south to Rizhao Port, Huang Da Line to Tianjin in the north and Huang Shuo Railway in the west. Its highway effect is that the south bank is connected with National Highway 205 and the north bank is connected with Binzhou Ring Road, which makes Binzhou pass through Anhui, Jiangsu, Zhejiang and Fujian, to Hebei and Tianjin in the north and to Guangzhou in the south.
bridgework
The total length of the Yellow River Railway Bridge in Binzhou, Shandong Province is 7000m, which spans the main bridge of the Yellow River main channel 78 1.5m, with two spans 1.20m in the north and south, and 180m in the middle, with five holes running through. The highway part of the bridge was opened to traffic on August 20, 2007, and the railway part was put into trial operation on September 29, 2009.
The main bridge is divided into upper and lower floors. The upper level is the expressway and the lower level is the railway. The highway is a first-class highway with four lanes in both directions and a deck width of 19m. The main bridge structure is triangular truss, with truss height 18m, truss width 1 1m and internode length 10m. The chord sections of the main truss are all box-shaped, the web members are box-shaped and H-shaped, and the maximum member weight is about 27t. The main truss members are spliced with high-strength bolts at the joints. The main quantities are steel beam manufacturing and installation 1 1290t and 320,000 sets of high-strength bolts.
The bridge is located in the narrow reach from Aishan to Lijin in the lower reaches of the Yellow River, which is greatly affected by flood season and ice flood. This section of the Yellow River is not navigable, and most of the water construction machinery and equipment cannot be used. The steel truss girder is erected by temporary pier cantilever. The second and third tunnels cross the main channel of the Yellow River 180m. After the project is completed, no temporary facilities are allowed to be left on the main channel. The steel beam has a large span and the fulcrum reaction is large (1200t/ truss). Therefore, the construction and removal of temporary piers is one of the difficulties in the erection of steel beams. It is difficult to erect steel beams and move them vertically and horizontally. The key to ensure the quality of steel beam erection is the order of steel beam erection, linear control, elevation and fulcrum reaction control during steel beam erection. The erection period of steel beams is short, and the steel beams freeze in winter, which makes it more difficult to erect steel beams.
Main bridge steel beam
Overall scheme for erection of steel beams The main bridge is provided with piers 0# ~ 5#, and steel beams are erected from pier 5# on the south bank to pier 0# on the north bank in one direction. /kloc-the first hole of 0/20m steel beam is erected by scaffolding method; 180m three-hole steel beam is cantilever-spliced by temporary pier method, first cantilever-spliced 100m, supported on temporary pier, and then cantilever-spliced 80m. When assembling the second hole steel beam, the tail of the first hole steel beam is weighted to enhance the longitudinal overturning stability. The fifth hole 120m steel beam is cantilever-mounted by temporary support method. First cantilever installation 100m, support on temporary support and then install 20m to complete the installation of all steel beams.
The steel beams of the first hole120m and the second hole180m are erected on the south beach. In order to shorten the construction period, in addition to installing the mobile girder crane on the steel beam and along the track, two 50t truck cranes are added for assembly, and the steel beam components are transported by trailer through the sidewalk on the beach. Third, the four-hole 180m steel beam is erected by a girder crane, and the steel beam members are transported by the temporary track and trestle on the railway bridge erected on the steel beam. The fifth hole of 120m steel beam is erected on the north bank. In addition to the installation of beam crane, two 50t truck cranes are added for assembly, and steel beam members are transported by trestle.
The main temporary load for erection of steel beams is 3 0 0 k N/ truss, the crane walkway weighs 2.55 k N/m, each assembling foot weighs 7.2 k N, the beam trolley weighs 12t, the track weighs 1.05 kn/m, the feng shui pipe and safety net weigh 0.64k N/m, and the construction crowd and carrying tools weigh 0.67 kN/. ..
Steel beam pre-assembly yard and pre-assembly yard are arranged on the east side of the South Bank Bridge of the Yellow River (downstream side of piers 5 # ~ 6 #), including pre-assembly pedestal and construction access road. Two 25t, 16m gantry cranes are set in the beam storage yard and the pre-assembly yard, a steel beam hoisting station is set between pier No.5 and pier No.6, and a transverse transportation passage and a beam trolley are set between the hoisting station and the pre-assembly yard.
Pre-assembly of main components of steel beam includes the following contents: pre-assembly of upper and lower chord multi-layer plate bundle nodes: according to the pre-assembly of components and bolt marking diagram, at the end of components, the spliced plates are pasted one by one in the order of plates, and the four corners are fixed with positioning nails. First, 65,438+00% punching nails are driven, and then 25% high bolts are generally driven and tightened. Pre-assembly of polished jacking joint: at the end of the lower chord, assemble all splicing plates, connecting angle steel and backing plate together according to the joint design drawing, and fill bolts for initial screwing, and send them as a whole after assembly. After assembling with the upright post, check the tightness of polishing. The upright support plate is closely attached to the bottom plate, and the gap between the plates is less than 0.2 mm. Pre-installed small upright and diagonal bars: the upright and diagonal bars are sent with filling plates. Railway longitudinal beam: it is divided into ordinary longitudinal beam, longitudinal beam at braking joint, telescopic longitudinal beam and end longitudinal beam. The longitudinal beam needs to be pre-assembled with connecting angle steel, fish-shaped plate, horizontal longitudinal seam, middle transverse seam and bracket connected with the cross beam. For the telescopic longitudinal beam, the telescopic bracket and the telescopic longitudinal beam need to be connected into a whole through temporary connecting rods.
Railway beam:
Pre-assembled connecting angle steel, anti-climbing angle steel and sidewalk connecting angle steel connected with the main truss.
The first hole of steel beam erection 120m is located on the bank of the Yellow River on the south bank. Bents assembled with universal bars are arranged at the first small node of the steel beam and all the big nodes of the lower chord (see Figure 2). The elevation of the top surface of the bent takes into account the camber of the steel beam and the deflection of the steel beam during erection.
The assembly steps of the first hole steel beam are as follows: the upper support of pier No.5 is set as temporary fixed support, and the movable support is placed on pier No.4 in advance; Steel beams are erected by crawler cranes or truck cranes. First, assemble the first four 40m internode steel beams on the bent pier. After the assembly of four internode steel beams is completed, a girder crane is assembled on the top surface of the upper chord of the steel beams, and the assembled eight internode steel beams are 80m；; After arriving at pier 4, first close the single truss triangle and continue to cantilever to the second hole 20m. After the high-strength bolts of steel beam joints are finally tightened, the 4# pier will be padded. Jacking up the steel beam nodes of pier 4, so that the scaffolding of each node in the first hole is suspended; According to the deviation of the center line of the main truss of Pier 5 and Pier 4, if it exceeds the requirements of the construction specification, it will move laterally. After the transverse movement is completed, the top height of the steel beam of pier No.4 will be raised to the required elevation, and the fixed bearing of pier No.5 will be changed into a movable bearing to complete the erection of the steel beam of the first hole.
The erection of two-hole steel beams needs to solve the following problems: how to get on the temporary pier L3 and pier 3# due to the downward deflection of the steel beams during erection; The second hole steel beam 100m, with insufficient longitudinal stability, needs to be weighed on the first hole steel beam; How to empty the temporary pier after the erection of the two-hole steel beam is completed; The transverse and longitudinal positions of the steel beam may be deviated beyond the allowable values, so it is necessary to move the steel beam vertically and horizontally.
In order to solve the above problems, the following schemes are adopted: (1) The joint height of the steel beam of pier No.4 is 30cm (relative to E0 joint), so as to overcome the deflection of the steel beam and solve the L3 problem of the upper temporary pier; Cantilever assembled steel beam 60m；; 80t is pressed between the first two sections of the upper chord of the first hole steel beam to solve the longitudinal stability problem; Continue to cantilever assemble the steel beam for 40m until it reaches the temporary pier L3. After the steel beam joints are closed and the high-strength bolts of the main truss joints are finally tightened, the cantilever end joints are copied. Continue cantilever assembly of 60m steel beams; ; According to the data calculated by the design unit, the steel beam of Pier 4 will be lowered to the top of 15c m, so that the steel beam can be placed on Pier 3. Continue to cantilever assemble the steel beam for 20m until it reaches pier 3. After the steel beam node is closed, copy the steel beam node here. Continue cantilever assembly of the third hole steel beam 20m. After the high-strength bolts of the main truss joints are finally tightened, the steel beam joints of pier No.3 are jacked up by 45c m, then the steel beam joints of pier No.4 are jacked up to the temporary pier space, and then the steel beam joints of pier No.4 are jacked up to 0 (relative to E0 joint). According to the deviation of the longitudinal and transverse center lines of the main truss of pier No.3, if it exceeds the requirements of the construction specification, it will be moved laterally, and the E30 node steel beam will be moved laterally to the range required by the construction specification by using the temperature difference method;
The temporary fixed bearing of pier No.4 was changed into movable bearing, and pier No.3 was set as fixed bearing, thus completing the erection of the second hole steel beam.
Erecting the third-hole steel beam The third-hole steel beam is in the water 140m, which is different from the second-hole steel beam in how to install the temporary pier and No.2 pier and how to dismantle the temporary pier.
The following methods are adopted for erection: the joint height of pier 3 steel beam is 45cm (relative to E0 joint) to overcome the deflection of steel beam in the assembly hole; Cantilever assembled steel beam, length 100m, reaches temporary pier L3. After the steel beam joints are closed and the high-strength bolts of the main truss joints are finally tightened, the cantilever end joints are copied and padded. Continue cantilever assembly of 60m steel beams; ; According to the data calculated by the design unit, the 3# pier will be reduced to 15c m, so that the 2# pier can be installed on the steel beam; Continue cantilever assembling the steel beam for 20m until it reaches pier 2#. After the steel beam node is closed, copy the steel beam node here. Cantilever assemble the steel beam of the fourth hole for 20m, and after the high-strength bolt of the main truss node is finally tightened, jack the steel beam node of No.2 pier for 62c m, and jack the No.3 pier again until the temporary pier is vacant; According to the deviation of the transverse center line of the main truss of pier 2#, if it exceeds the requirements of construction specifications, it shall be moved laterally; Lower E30 node of pier No.3 to 0 (relative to E0 node), and complete the erection of steel beam of No.3 hole.
Erection of steel beams for the fourth hole and the fifth hole If the steel beam for the fourth hole is erected according to the traditional method, after the erection of the steel beam for the third hole is completed, it is necessary to set the 2# pier as a fixed bearing and change the 3# pier into a movable bearing, which may cause the longitudinal position of the steel beam to shift. In order to reduce the longitudinal displacement, after the erection of the third and fourth steel beams, pier No.3 is still set as a fixed bearing, and other piers and temporary piers or temporary bearings are set as movable bearings.
The erection method of the fourth hole is basically the same, but the setting method of the joint height of the steel beam of pier No.2 is different from that of the temporary pier.
The fifth hole 120m steel beam is erected on the north bank. The erection method adopted is: 1# pier steel beam node is padded with a height of 34c m (relative to E0 node) to overcome the downward deflection of steel beam with assembly holes; Cantilever assembled steel beam 100m and installed temporary pier. After the steel beam joints are closed, the high-strength bolts of the main truss joints are finally tightened by 50%, and the steel beam joints at the cantilever end are immediately padded; Continue to cantilever assemble the steel beam for 20m to pier 1#; 1# pier steel beam joints are closed, and after the high-strength bolts of the main truss joints are finally tightened, the 0# pier steel beam joint head is connected to the temporary pier, and then the 1# pier steel beam joint head is connected to 0 (relative to E0 node);
According to the deviation of the transverse center line of the main truss of pier 0, if it exceeds the requirements of construction specifications, it will move laterally.
Longitudinal direction of steel beam
The lateral movement of the transverse steel beam is divided into two stages: first, after the installation of each hole is completed, the center line of the steel beam is laterally adjusted to the design position, so that the steel beam of the next hole cantilever out along the direction of the design center line; The second is to move the center line of the steel beam to the design position before the bearing installation, so as to meet the requirements of installation accuracy and construction specifications.
In the process of beam erection, due to the influence of sunlight, the temperature between the upstream and downstream trusses of the steel beam is different, which leads to the lateral bending of the steel beam; In the process of cantilever installation, the asymmetry of upstream and downstream construction load, manufacturing and installation errors will lead to the deviation of the center line of steel beam from the design center line. When the cantilever beam of each hole reaches the top of the front pier and the temporary pier is empty, if the lateral deviation of the front fulcrum is large, the center line of the steel beam can be adjusted laterally, because the reaction force is small at this time, and the lateral movement is easier.
Before installing the bearing, check the position of the center line of the steel beam. If the deviation between the center line of the steel beam and the design center line is greater than the requirements of the construction specification, the steel beam should move laterally.
The traverse operation steps are as follows: detect the position of the center line of the steel beam and determine the traverse amount. In order to observe the conductor distance, you can hang the wire hammer on the beam and read the conductor distance at any time; Start the vertical jack and jack the steel beam about 1c m until the steel beam and the bearing at the lower node are all empty; Shake the horizontal jack and move the beam laterally.
During the erection of steel beams, due to the influence of temperature changes, construction load and other factors, the longitudinal position of steel beams deviates, so it is necessary to make preliminary adjustments to the longitudinal position of steel beams to meet the needs of beam erection. In the process of bearing installation, it is necessary to further adjust the steel beam to make it accurately positioned.
There are two methods for longitudinal movement of steel beams: alternating up and down method and temperature difference method. When pier 3 is on the steel beam of this bridge (pier 3 is a fixed support), it is in late September, and the temperature on the construction site changes greatly in the morning and evening, which is suitable for longitudinal movement by temperature difference method. The operation steps of longitudinal movement are as follows: the steel beam passes through pier No.3 and is assembled forward. After the final screwing of the high-strength bolts at the joints is completed, the steel beams are lifted and the temporary piers are vacated; The steel beam moved horizontally and pier 4 collapsed. Check the longitudinal position of 3# pier steel beam and determine the longitudinal moving direction.
According to the measurement results, the longitudinal positions of the node center E30 on the 3# pier and the design center of the 3# pier supporting stone are 24m m；; Away from the north shore; When the temperature is the highest in the daytime (around noon 12), Pier 4 is fixed. Since the temperature drops to 12 at night, the temperature difference is estimated to be around 10℃. Displacement △ L = α△ Tl = 0.000018×10×18000 = 2.12 ㎝; Fix pier 3 and loosen pier 4. When the temperature rises to the highest, fix pier No.4, loosen pier No.3, and carry out the second cycle until it reaches the required position. Fix pier No.3 and loosen pier No.4 to complete the longitudinal movement. The actual longitudinal movement operation * * * has been carried out for three cycles, and the longitudinal position deviation between the node center on the 3# pier of the steel beam and the design center of the supporting cushion stone of the 3# pier is adjusted to the south bank 10 mm.
Important significance
The construction of the Yellow River Railway Bridge in Binzhou will greatly improve the traffic network layout in northern Shandong, provide a convenient passage for the local economic construction and development and even the mutual radiation of the Bohai Economic Circle, and have remarkable economic and social benefits.
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