A hoop-type combined cross beam

Abstract

The application discloses a hoop type combined cross beam, which is characterized in that the technical scheme comprises a pre-embedded steel plate arranged on a stand column, a vertical support fixed on the pre-embedded steel plate, hoops arranged on the vertical support, a plurality of hydraulic jacks and a plurality of unloading blocks arranged on each hoop, and a cross beam arranged on the unloading blocks and arranged along the transverse direction of an elevated bridge. The cross beam comprises multiple sections, the sections are connected through bolts, the cross beam adopts I45b H-shaped steel, and a plurality of transverse limiting devices are arranged on the cross beam. A plurality of screw jacks are arranged on the outer side of the cross beam to lift a steel truss, then longitudinal moving rollers are arranged on the cross beam and along the bottom of the steel truss, the cross beam serves as a track when the steel truss slides, and the frictional force during the sliding of the steel truss can be effectively reduced. The cross beam is spliced by multiple sections, the connecting part of the adjacent two sections is provided with upper connecting plates, lower connecting plates, intermediate connecting plates and is connected through bolts, and therefore the length of the cross beam can be adjusted at will according to requirements.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a clamp-type composite crossbeam. Background Technology

[0002] The development of bridge engineering is progressing rapidly, and the requirements for construction technology and quality are becoming increasingly stringent. Multi-span steel truss structures are widely used in bridge engineering. The steel truss is set on the crossbeams. Since the existing crossbeams only serve to support the steel truss and cannot be raised or lowered, their function is limited. After the box girder is poured, workers need to crawl under the bridge to dismantle the steel truss and then install it on the next span. Because the area under the bridge is at sea level, the workers' working space is very small, making dismantling and transportation very inconvenient and difficult. It also requires a high level of physical fitness from the workers, which leads to long construction periods and high construction costs for offshore bridges.

[0003] The information disclosed in the background section is only for enhancing the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a clamp-type composite beam with multiple functions, which can greatly simplify the construction of offshore bridges.

[0005] This invention is achieved through the following technical solution: A clamp-type composite crossbeam is characterized in that: it includes a pre-embedded steel plate on a column 3, a vertical support 4 fixed on the pre-embedded steel plate, a clamp 5 on the vertical support 4, a plurality of hydraulic jacks 8 and a plurality of unloading blocks 10 on each clamp 5, and a crossbeam 7 on the unloading blocks 10, the crossbeam 7 being erected along the transverse direction of the viaduct.

[0006] As described above, the clamp-type combined crossbeam is characterized in that: the crossbeam 7 comprises multiple segments, each segment is connected by bolts, the crossbeam 7 is made of I45b I-beam steel, and multiple lateral limiting devices 12 are provided on the crossbeam 7; The lateral limiting device 12 includes a lateral limiting device base 11 for mounting the lateral limiting device 12 and a limiting pulley disposed thereon, the limiting pulley being used to limit the steel truss 1; A jack support 705 is provided on the outside of the crossbeam 7. The jack support 705 is used to install a screw jack 13 to lift the steel truss 1. A longitudinal roller 22 is detachably provided on the crossbeam 7. After the steel truss 1 is lifted, it sits on the longitudinal roller 22 and can slide longitudinally on the crossbeam 7 under external force.

[0007] As described above, the clamp-type composite crossbeam is characterized in that: the crossbeam 7 includes two outer sections 701 and one middle section 702, the outer sections 701 are symmetrically connected to both ends of the middle section 702 by bolts, two hydraulic jack connecting beams 703 and two diagonal bracing connecting beams 704 are provided on the outer sections 701, the two hydraulic jack connecting beams 703 are located in the middle of the two diagonal bracing connecting beams 704, and the plate along the length of the crossbeam 7 in the outer section 701 is made of double-jointed I-beams.

[0008] As described above, the clamp-type combined crossbeam is characterized in that: on the double-jointed steel beam, there are respectively provided a transverse limiting device base 11, multiple jack supports 705, two diagonal bracing connecting beam supports 706, multiple hydraulic jack connecting beam supports 707, multiple unloading block top plates 709, and end face connecting plates 708.

[0009] As described above, the clamp-type combined crossbeam is characterized in that: the part connecting the outer section 701 and the middle section 702 is provided with an upper connecting plate 710, a lower connecting plate 711, and a middle connecting plate 712, which are connected by bolts.

[0010] As described above, the clamp-type combined crossbeam is characterized in that: the vertical support 4 includes four double-joint rods 401 surrounding the column 3, two adjacent double-joint rods 401 are connected by a connecting rod, a top plate 402 and a bottom plate 403 are respectively provided at the top and bottom of the double-joint rods 401, the bottom plate 403 is welded to the embedded steel plate, and triangular plates are welded on both sides of the top plate 402.

[0011] As described above, the clamp-type combined crossbeam is characterized in that: the clamp 5 is symmetrically spliced ​​from four identical components to hold the column 3, the bottom of the clamp 5 is placed on the top plate 402, and four first mounting positions 501 for placing the unloading block 10 are symmetrically provided on the top of the clamp 5. Between two first mounting positions 501, there is a downwardly recessed second mounting position 502 for placing the hydraulic jack 8.

[0012] As described above, the clamp-type combined crossbeam is characterized in that: each clamp 5 is provided with two hydraulic jacks 8, and each clamp 5 is provided with four unloading blocks 10.

[0013] Compared with the prior art, the present invention has the following advantages: 1. This invention uses hydraulic jacks and unloading blocks on the clamps. By cooperating with the hydraulic jacks and unloading blocks, the crossbeam can be raised and lowered to achieve the purpose of demolding. After demolding, the steel truss descends and detaches from the box girder. In this way, the steel wire rope released by the winch can pull the steel truss forward to the next section. Compared with the existing construction method of dismantling the steel truss and then installing it to the next section, it can greatly shorten the construction time and reduce labor costs.

[0014] 2. The present invention has multiple spiral jacks on the outside of the crossbeam to lift the steel truss, and then longitudinal rollers are installed on the crossbeam and along the bottom of the steel truss. The crossbeam acts as a track for the steel truss to slide, which can effectively reduce the friction force when the steel truss slides.

[0015] 3. In this invention, after the concrete is poured, a hanger is installed at the bottom of the box girder, a track is installed on the hanger, and an electric hoist is installed on the track. After the steel truss is moved to the next section, the crossbeams, clamps, vertical supports, etc. are manually removed and transported to both sides of the box girder by the electric hoist to the next section for installation. Because the space under the bridge will be greatly increased after the steel truss is removed, it will be easier and faster for workers to remove the crossbeams, clamps, and vertical supports.

[0016] 4. The crossbeam of the present invention is composed of multiple segments spliced ​​together. The connecting part of two adjacent segments is provided with an upper connecting plate, a lower connecting plate, and a middle connecting plate and is connected by bolts. Therefore, the length of the crossbeam can be adjusted arbitrarily according to the requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the elevation of the cast-in-place support structure of the present invention; Figure 2 This is a schematic diagram of the cast-in-place support structure of the present invention; Figure 3 This is a schematic cross-sectional view of the cast-in-place support structure of the present invention; Figure 4 This is a schematic diagram of the vertical support of the present invention; Figure 5 This is a schematic diagram of the vertical support of the present invention; Figure 6 This is a frontal view of the lateral limiting device of the present invention; Figure 7 This is a plan view of the lateral limiting device of the present invention; Figure 8 This is a perspective view of the clamp of the present invention; Figure 9 This is a structural diagram showing the positions of the unloading block, jack, and diagonal brace of the present invention; Figure 10 This is a side view of the unloading block of the present invention; Figure 11 This is an elevation view of the unloading block of the present invention; Figure 12 This is a plan view of the Bailey sheet of the present invention; Figure 13 This is a plan view of the side rod of the Bailey plate of the present invention; Figure 14 This is a plan view of the Bailey plate chord of the present invention; Figure 15 This is a front view of the crossbeam of the present invention; Figure 16 This is a top view of the crossbeam of the present invention; Figure 17 yes Figure 16 BB section view; Figure 18 yes Figure 16 Sectional view of AA; Figure 19 This is a front view of the outer section of the crossbeam of the present invention; Figure 20 This is a top view of the outer section of the crossbeam of the present invention; Figure 21 This is a front view of the double-I-beam section on the outer side of the crossbeam of the present invention; Figure 22 This is a top view of the double-I-beam section on the outer side of the crossbeam of the present invention; Figure 23 This is one of the schematic diagrams of the steel truss lifting of the present invention; Figure 24 This is the second schematic diagram of the steel truss lifting of the present invention; Figure 25 This is the third schematic diagram of the steel truss lifting of the present invention; Figure 26 This is one of the schematic diagrams for the installation of the moving frame device of the present invention; Figure 27 This is the second schematic diagram of the installation of the moving frame device of the present invention; Figure 28 This is one of the schematic diagrams of the forward movement of the steel truss in this invention; Figure 29 This is the second schematic diagram of the forward movement of the steel truss in this invention; Figure 30 This is a schematic diagram of the installation of the electric hoist of the present invention.

[0018] In the diagram: 1 is a steel truss; 101 is a vertical support frame; 102 is a horizontal support frame; 2 is a single Bailey beam; 3 is a column; 4 is a vertical brace; 401 is a double-jointed rod; 402 is a top plate; 403 is a bottom plate; 5 is a clamp; 501 is the first installation position; 502 is the second installation position; 6 is a Bailey panel; 601 is a chord; 602 is a side member; 603 is a middle vertical member; 604 is the first diagonal member; 7 is a crossbeam; 701 is the outer section; 702 is the middle section; 703 is the hydraulic jack connecting beam; 704 is the diagonal brace connecting beam; 705 is the jack support; 706 is the diagonal brace connecting beam support. 707 is the hydraulic jack connecting beam support; 708 is the end face connecting plate; 709 is the top plate of the unloading block; 710 is the upper connecting plate; 711 is the lower connecting plate; 712 is the intermediate connecting plate; 8 is the hydraulic jack; 9 is the diagonal brace; 10 is the unloading block; 11 is the lateral limiting device base; 12 is the lateral limiting device; 13 is the screw jack; 14 is the support beam; 15 is the winch; 16 is the embedded bolt; 17 is the embedded reaction frame; 18 is the steering pulley; 19 is the traction pin; 21 is the side formwork; 22 is the longitudinal moving roller; 23 is the hoist; 24 is the electric hoist; 25 is the track. Detailed Implementation

[0019] The technical features of the present invention will be further described in detail below with reference to the accompanying drawings so that those skilled in the art can understand them.

[0020] Since the crossbeams and steel trusses are used together, the formwork frame including the crossbeams and steel trusses is introduced first. The formwork frame includes embedded steel plates on the columns 3, vertical supports 4 fixed on the embedded steel plates, clamps 5 on the vertical supports 4, multiple hydraulic jacks 8 and multiple unloading blocks 10 on each clamp 5, and a crossbeam 7 on the unloading blocks 10. The crossbeam 7 is erected along the transverse direction of the viaduct. Diagonal braces 9 are provided on the clamps 5 on both sides of the viaduct. The crossbeam 7 is equipped with a steel truss 1 that can slide to the next section after the formwork is lowered.

[0021] In this embodiment, there are four columns 3 in one row, therefore the steel truss 1 has five sets along the bridge direction, such as... Figure 2 and Figure 3 As shown. The clamp 5 holds the column 3 tightly by friction. The clamp 5 is not connected to the column 3. The crossbeam 7 is erected horizontally on multiple unloading blocks 6. The column 3 passes through the crossbeam 7.

[0022] After the box girder is tensioned and grouted, the support frame is lowered as a whole using hydraulic jacks 8 and unloading blocks 10, and the steel truss 1 is slid into the next section in groups to continue construction. This eliminates the need to dismantle the steel truss 1 and then install it in the next section, which can greatly shorten the construction period and reduce labor costs.

[0023] As described above, the clamp-type combined crossbeam includes four double-jointed rods 401 surrounding the column 3. Adjacent double-jointed rods 401 are connected by connecting rods. A top plate 402 and a bottom plate 403 are respectively provided at the top and bottom of the double-jointed rods 401. The bottom plate 403 is welded to the embedded steel plate, and triangular plates are welded to both sides of the top plate 402.

[0024] Diagonal braces 9 are provided on the two outer clamps 5, and the tops of the diagonal braces 9 are fixed to the crossbeam 7. Because the clamps 5 on both sides are equipped with diagonal braces 9, the installation method of the clamps 5 on both sides is different from that of the middle clamp 5, and adaptive adjustments need to be made, such as... Figure 3 As shown.

[0025] In this embodiment, the clamp 5 is symmetrically spliced ​​from four identical components to hold the column 3. The bottom of the clamp 5 is placed on the top plate 402 of the vertical support 4. Each clamp 5 has two hydraulic jacks 8 with a capacity of 200 tons. Each clamp 5 has four unloading blocks 10 with a capacity of 100 tons or 200 tons. A pad is provided at the bottom of the unloading block 6 and a pad is also provided at the top of the hydraulic jack 8.

[0026] Furthermore, four first mounting positions 501 for placing the unloading block 10 are symmetrically provided on the top of the clamp 5, and a second mounting position 502 for placing the hydraulic jack 8 is provided between two first mounting positions 501, which is recessed downwards. Figures 8 to 11 As shown.

[0027] As described above, in the clamp-type composite beam, each group of steel trusses 1 includes multiple individual Bailey beams 2. Adjacent individual Bailey beams 2 are connected by vertical support frames 101 and horizontal support frames 102. Each individual Bailey beam 2 is bolted to both the vertical support frame 101 and the horizontal support frame 102. Each individual Bailey beam 2 includes multiple connected Bailey sections 6. Adjacent groups of steel trusses 1 are connected by distribution beams. Each group of steel trusses 1 is connected to the distribution beam using U-bolts. Figure 2 As shown.

[0028] Furthermore, the Bailey bridge section 6 includes two horizontal chords 601. At the ends of the chords 601, end members 602 connect the two chords 601. The two chords 601 and the two end members 602 form a rectangle. Within this rectangle, there are also several intermediate vertical members 603 connecting the two chords 601 and several first diagonal members 604. The two ends of the first diagonal members 604 are respectively connected to the chords 601 and the end members 602, or respectively connected to the chords 601 and the intermediate vertical members 603. The four first diagonal members 604 connected end-to-end form a rhombus. The two ends of the chords 601 are respectively provided with female and male ends. The female end of one Bailey bridge section 6 connects to the male end of another Bailey bridge section 6 to form a single Bailey beam 2. The Bailey bridge section 6 is made of square steel tubing, such as... Figures 12 to 14As shown, Bailey panels using this structure and material are lighter, have stronger load-bearing capacity, and can greatly reduce material costs.

[0029] The steel truss installation method is as follows: 1. First, assemble Bailey panels 6 into a single Bailey beam in the steel assembly area. Connect two beams together with a support frame to form a single row and transport them to the construction site. Then, use an 80t crawler crane to lift them onto the installed crossbeam 7 or its support, and then splice the two sections together.

[0030] 2. The steel truss is erected along the longitudinal direction of the bridge. Each Bailey beam 2 is composed of 17 Bailey sections 6 connected together and is hoisted into place from the inside to the outside of the box girder.

[0031] 3. After the steel truss 1 is assembled, it is inspected. The main checks are whether the truss, safety pins, bolts and support frames are securely connected to ensure that the steel truss is safe and reliable during the erection and use.

[0032] 4. Finally, place the transverse distribution beam on the steel truss 1. The distribution beam is firmly connected to the steel truss 1 with U-bolts to form a steel platform.

[0033] 5. After the steel platform construction is completed, install the bottom formwork and side formwork, and form the support structure. The bottom formwork uses a combination of steel and wood. A 5mm thick steel plate is laid on the top surface of the three sets of steel trusses 1 in the middle, and I-beams with bamboo plywood are used between every two sets of steel trusses 1. Side formwork 21 is also provided on the steel trusses 1 on both sides.

[0034] As described above, the clamp-type composite beam 7 comprises multiple segments, each connected by bolts. The beam 7 is made of I45b I-beams. The beam 7 is connected to the steel truss 1 by U-bolts. A lateral limiting device 12 is provided on the beam 7, located on the outer side of each group of steel trusses 1, to limit the movement of the steel truss 1. The function of the lateral limiting device 12 is to limit the two outer sides of the steel truss 1, preventing lateral displacement when it slides forward.

[0035] Furthermore, the lateral limiting device 12 includes a lateral limiting device base 11 and limiting pulleys disposed thereon, such as... Figure 6 and Figure 7 As shown.

[0036] The crossbeam 7 can be three or five segments. In this embodiment, the crossbeam 7 is three segments, including two outer segments 701 and one middle segment 702. The outer segments 701 are symmetrically connected to both ends of the middle segment 702 by bolts, as shown below. Figures 15 to 18 As shown; Two hydraulic jack connecting beams 703 and two diagonal brace connecting beams 704 are provided on the outer section 701. The two hydraulic jack connecting beams 703 are located between the two diagonal brace connecting beams 704. The connecting beams are tie beams that connect the components, and their function is to increase the overall integrity of the structure and increase the lateral or longitudinal stiffness of the building. The hydraulic jacks 8 are supported on the hydraulic jack connecting beams 703 to support or lift the crossbeam 7. The upper end of the diagonal brace 9 is fixed to the diagonal brace connecting beam 704. Figure 16 As shown, the outer segments 701 are the left outer segment and the right outer segment. The diagonal bracing connecting beam of the left outer segment is called the left diagonal bracing connecting beam, and the diagonal bracing connecting beam of the right outer segment is called the right diagonal bracing connecting beam. The upper end of the left diagonal brace is fixed to the left diagonal bracing connecting beam, and the upper end of the right diagonal brace is fixed to the right diagonal bracing connecting beam.

[0037] The steel plate along the length of the crossbeam 7 in the outer section 701 is made of double-layered I-beams. On these double-layered I-beams are respectively provided a transverse limiting device base 11, multiple jack supports 705, a diagonal brace connecting beam support 706, multiple hydraulic jack connecting beam supports 707, multiple unloading block top plates 709, and an end face connecting plate 708. The transverse limiting device base 11 is used to install the transverse limiting device 12; the jack supports 705 are used to install the screw jack 13; the diagonal brace connecting beam supports 706 are used to install the diagonal brace connecting beam 704, with both ends of the diagonal brace connecting beam 704 fixed to the diagonal brace connecting beam support 706; the hydraulic jack connecting beam supports 707 are used to install the hydraulic jack connecting beam 703, with both ends of the hydraulic jack connecting beam 703 fixed to the hydraulic jack connecting beam support 707; and the unloading block 10 rests on the unloading block top plate 709 to support the crossbeam 7. Figure 21 and Figure 22 As shown, the end face connecting plate 708 is used to connect the intermediate section 702.

[0038] like Figure 15 As shown, the portion connecting the outer section 701 and the middle section 702 is provided with an upper connecting plate 710, a lower connecting plate 711, and a middle connecting plate 712, which are connected by high-strength bolts. The difference between the middle section 702 and the outer section 701 is that the middle section 702 does not have a diagonal bracing connecting beam 704.

[0039] The crossbeam 7 of this invention is composed of multiple segments, which is easy to assemble and disassemble. A transverse limiting device 12 for limiting the steel truss 1, a spiral jack 13 for lifting the steel truss 1, and a longitudinal moving roller for sliding the steel truss 1 can be installed on the crossbeam. It can also support the steel truss 1, etc. It has multiple functions and strong practicality.

[0040] In this embodiment, the box girder is cast-in-place on five rows of columns 3, so the cast-in-place box girder is a four-span unit. Each group of steel trusses 1 includes multiple single Bailey beams 2 and horizontal support frames 102 and vertical support frames 101 connecting them. Each single Bailey beam 2 includes four spans and is composed of multiple Bailey sections 6 connected together. Figure 2 As shown, the first span of a single Bailey beam is composed of five Bailey sections 6 connected together, and the second, third, and fourth spans of a single Bailey beam are all composed of four Bailey sections 6 connected together. Therefore, a single Bailey beam contains 17 Bailey sections 6.

[0041] The formwork was constructed span by span, using the existing steel trestle as the working surface and a crawler crane. First, the formwork was erected in the transverse direction. After the first span of the steel truss was completed, the second span of the steel truss was erected in the longitudinal direction. The above steps were repeated until the last span of the steel truss was completely erected. Then, the bottom formwork was installed and the support was pre-stressed. In order to reduce inelastic deformation and ensure the load-bearing capacity of the support, the pre-stressing weight was not less than 1.1 times the support load.

[0042] The construction method for this formwork is as follows: S1. Construction preparation: Assemble multiple Bailey beam sections 2 into a single Bailey beam, connect the two beams with a support frame, and then transport them to the construction site; The placement of steel components should be determined according to the order in which they are used; the weight, center of gravity, and lifting point of the steel components should be marked before leaving the factory for easy lifting and installation; they should be transported to the construction site using flatbed trucks, and all steel components should be coated with anti-corrosion paint after processing.

[0043] S2. Construction of cast-in-place piles: The columns are poured with concrete in two stages, and steel plates are pre-embedded on the top of the piles during the concrete pouring. S3. Fabrication and installation of column vertical bracing: Weld vertical bracing 4 around column 3, and weld the base plate of vertical bracing 4 onto the pre-embedded steel plate; S4. Fabrication and installation of column clamps: Assemble multiple components onto column 3, and use a level to control the installation height of clamps 5 to ensure the elevation of the support platform. S5. Installation of unloading blocks; Install four unloading blocks 10 on the first mounting position 501 of the clamp 5, and install two hydraulic jacks 8 on the second mounting position 502 of the clamp 5. S6. Crossbeam installation: The crossbeam 7 is hoisted in three stages and then connected and fixed, supported by the unloading block 10. S7. Installation of Bailey beams and support frames: The Bailey beams are hoisted from the inside to the outside of the box girder. After the Bailey beams are accurately hoisted above the crossbeam 7, temporary diagonal bracing is used on both sides using steel pipes. After the Bailey beams are fixed to the crossbeam 7, the temporary diagonal bracing is removed. The two adjacent Bailey beams are connected and fixed by the horizontal support frame 102 and the vertical support frame 101. The Bailey beams are installed span by span, that is, the second span is installed after the first span is installed, until the last span of the Bailey beam is installed. A single Bailey beam consists of 17 Bailey sections. After the steel truss is assembled, it is inspected, mainly to check whether the truss, safety pins, bolts, and support frames are securely connected, so as to ensure that the steel truss is safe and reliable during the erection and use. S8. Distribution beam installation: After installing one span of steel truss 1, transverse distribution beams should be placed on steel truss 1 and laid at the same interval. The distribution beams and steel truss are firmly connected by U-bolts to form a steel platform. S9. Diagonal bracing installation: Adjust the top elevation of steel truss 1 using unloading block 10; install the diagonal bracing after completion. S10. Installation of bottom formwork and side formwork: After the steel platform construction is completed, the bottom formwork and side formwork 21 are installed. The bottom formwork is made of steel and wood. The side formwork 21 is installed on the outer steel truss 1 and is used for pouring box girders. S11. Preloading of the support system: The main purpose of preloading is to eliminate the inelastic deformation of the support and to test the load-bearing capacity and stability of the support. The preloading weight shall not be less than 1.1 times the formwork load. S12, Formwork Reduction: After the prestressing tension of the box girder is completed and the concrete strength reaches 100% of the design strength, the Bailey beam should be unloaded, the entire support system should be lowered to separate it from the box girder, and then the hydraulic jack 8 should be used to remove the unloading block 10, and the steel truss 1 and crossbeam 7 should be lowered onto the clamp 5. The formwork lowering is carried out in two steps. First step: Lift the push rod of hydraulic jack 8 by about 280mm to support the crossbeam 7, lower the height of the unloading block 10 by 40mm, retract the push rod of hydraulic jack 8 to lower the formwork, and place the crossbeam 7 on the unloading block 10. Second step: Remove the 5 cm high pad on top of the hydraulic jack 8, raise the push rod of the hydraulic jack 8 by about 300 mm, support the crossbeam 7, remove the unloading block 10, retract the push rod of the hydraulic jack 8 to lower the formwork, and place the crossbeam 7 on the clamp 5 to complete the formwork lowering operation. The first time the hydraulic jack 8 lowers the formwork, it only supports the crossbeam 7, not lifts it, because there is still a box girder on the steel truss 1 at this time. The box girder is too heavy and fixed to the column 3, so the hydraulic jack 8 cannot lift the box girder. The first time, the crossbeam 7 and steel truss 1 are lowered to move them away from the box girder. The second time, the hydraulic jack 8 needs to slightly lift the crossbeam 7 in order to remove the unloading block 10.

[0044] S13. Deformation: Remove the longitudinal column-to-column wooden bottom formwork and distribution beams. Neatly place the distribution beams and formwork on top of the steel formwork on both sides, and temporarily secure them with straps. Figure 23 As shown; S14. Repeat steps S2 to S6 on the next section of beam to be poured. S15. The steel truss moves forward. Limiting devices 12 are set on the crossbeam 7 and on both sides of the steel truss 1 to maintain the direction of travel of the steel truss 1. When moving the span, the middle group of steel trusses is moved first. After it is moved into place, the middle group of steel trusses is fixed to the crossbeam 7, and then the outer group of steel trusses is moved.

[0045] Multiple jack supports 705 are provided on the outside of the crossbeam 7. The jack supports 705 are used to install the screw jack 13. A support beam 14 is provided at the bottom of the crossbeam 7. The screw jack 13 can be placed on the support beam 14 to increase the force-bearing area.

[0046] Before sliding steel truss 1, it must be jacked up first. The jacking steps are as follows: Step 1: Remove the side formwork 21 and the irregular I-beam formwork, and transport them to the next span using a flatbed truck; remove the wooden I-beam formwork behind the central column and place it on the adjacent steel formwork; place the support beam 14 under the bottom of the crossbeam 7, and use the spiral jack 13 to lift the steel truss 1, preparing to lift it group by group and span by span. Figure 23 As shown.

[0047] Step 2: Use screw jack 13 to lift a set of steel trusses 1 by 10cm, install longitudinal roller 22 on the crossbeam 7 to reduce the friction when the steel trusses 1 slides, lower screw jack 13 so that the set of steel trusses 1 sits on the longitudinal roller 22, and then remove screw jack 13 and support beam 14, as follows. Figure 24 and Figure 25 As shown. Because the screw jack 13 and the support beam 14 are located outside the crossbeam 7, it does not affect the installation of the longitudinal roller 22 on the crossbeam 7.

[0048] Before construction, install the support clamps 5, the crossbeams 7 and the longitudinal rollers 22 on the next column 3, and adjust the elevation.

[0049] In this embodiment, there are a total of five sets of steel trusses 1, and the sliding method of the middle three sets of steel trusses 1 is the same.

[0050] First, two winches 15 are placed at the front end of the cast-in-place beam section. The winches 15 are fixed by pre-embedded bolts 16. A pre-embedded reaction frame 17 is installed on the side of the front end of the cast-in-place beam section. Two steering pulleys 18 are installed on the pre-embedded reaction frame 17 in the vertical direction. Traction pins 19 are installed on both sides of a set of steel trusses 1, and a set of traction pins 19 is installed for each span. Figure 26 and Figure 27 As shown; Then the wire rope is released from the winch 15, the wire rope passes around the steering pulley 18, and then is stretched in the opposite direction and fixed to the traction pin 19 of the fourth span. The wire ropes on the two winches 15 are respectively fixed to the traction pins 19 on both sides. Finally, start the winch 15. The wire rope drives the steel truss 1 to move forward one span. The front end of the steel truss 1 is supported on the longitudinal roller 22 of the next crossbeam 7. The limiting pulley ensures that the steel truss 1 does not deviate when moving forward. Remove the wire rope and lock it to the traction pin 19 of the third span. Generally, it needs to slide in four stages. Figure 28 This is a diagram of the first slip. Figure 29 This is a schematic diagram of the second sliding. After the four spans are moved forward into place, the steel truss 1 is lifted by the screw jack 13 and the support beam 14 of the next section. The longitudinal roller 22 on the crossbeam 7 of the next section is removed, so that the steel truss 1 is placed on the crossbeam 7 of the next section. The steel truss 1 is fixed to the crossbeam 7 by U-bolts, and then the screw jack 13 and the support beam 14 are removed.

[0051] The aforementioned traction pin 19 can also be replaced by a spreader beam. First, slide the first group of middle steel trusses, then slide the second and third groups, and finally slide the steel trusses 1 on both sides. When sliding the steel trusses 1 on both sides, the two winches 15 above should be closer together, such as... Figure 27 As shown.

[0052] S16. Dismantle the steel structure below steel truss 1, such as Figure 30 As shown, after the concrete is poured, the plug is removed, the lifting rod 23 is installed, the track 25 is installed on the lifting rod 23, and two electric hoists 24 are installed on the track 25. The crossbeam 7, clamp 5, and vertical support 4 are manually removed and transported to both sides of the box girder through the electric hoists 24. Two two-ton electric chain hoists are installed on each track 25. The reason for installing two electric hoists 24 on the track 25 is that the disassembled crossbeam is long and requires two electric hoists 24 for transportation. After completion, the lifting rod 23 is removed and the pit is filled and repaired with epoxy resin mortar.

[0053] After the steel truss is removed, the space under the bridge will be much larger, making it easier and faster for workers to dismantle the crossbeam 7, clamp 5, and vertical brace 4.

[0054] S17, Proceed to the next segment of construction.

Claims

1. A clamp-type composite crossbeam, characterized in that: It includes a pre-embedded steel plate on the column (3), a vertical support (4) fixed on the pre-embedded steel plate, a clamp (5) on the vertical support (4), a plurality of hydraulic jacks (8) and a plurality of unloading blocks (10) on each clamp (5), a crossbeam (7) on the unloading block (10), the crossbeam (7) is erected along the transverse direction of the viaduct, the crossbeam (7) is used to support the steel truss (1) and allow the steel truss (1) to slide; The crossbeam (7) comprises multiple sections, which are connected by bolts. The crossbeam (7) is made of I45b I-beam. Multiple lateral limiting devices (12) for lateral limiting of the steel truss (1) are symmetrically provided on the crossbeam (7) and on the outside of each group of steel trusses (1). The lateral limiting device (12) includes a lateral limiting device base (11) for mounting the lateral limiting device (12) and a limiting pulley provided thereon, the limiting pulley being used to limit the steel truss (1); A jack support (705) is provided on the outside of the crossbeam (7). The jack support (705) is used to install a screw jack (13) to lift the steel truss (1). A longitudinal roller (22) is detachably provided on the crossbeam (7). After the steel truss (1) is lifted, it sits on the longitudinal roller (22) and can slide longitudinally on the crossbeam (7) under the traction of external force.

2. The clamp-type composite beam according to claim 1, characterized in that: The crossbeam (7) includes two outer sections (701) and one middle section (702). The outer sections (701) are symmetrically connected to both ends of the middle section (702) by bolts. Two hydraulic jack connecting beams (703) and two diagonal bracing connecting beams (704) are provided on the outer sections (701). The two hydraulic jack connecting beams (703) are located in the middle of the two diagonal bracing connecting beams (704). The plates along the length of the crossbeam (7) on the outer sections (701) are made of double-layered steel.

3. The clamp-type composite beam according to claim 2, characterized in that: The double-section steel is provided with a lateral limiting device base (11), multiple jack supports (705), two diagonal bracing connecting beam supports (706), multiple hydraulic jack connecting beam supports (707), multiple unloading block top plates (709), and end face connecting plates (708) for installing the lateral limiting device (12).

4. The clamp-type composite beam according to claim 2, characterized in that: The portion connecting the outer section (701) and the middle section (702) is provided with an upper connecting plate (710), a lower connecting plate (711), and a middle connecting plate (712), and is connected by bolts.

5. The clamp-type composite crossbeam according to claim 1, characterized in that: The vertical support (4) includes four double-ply rods (401) surrounding the column (3). Two adjacent double-ply rods (401) are connected by a connecting rod. A top plate (402) and a bottom plate (403) are respectively provided at the top and bottom of the double-ply rods (401). The bottom plate (403) is welded to the embedded steel plate. Triangular plates are welded on both sides of the top plate (402).

6. The clamp-type composite crossbeam according to claim 5, characterized in that: The clamp (5) is symmetrically spliced ​​from four identical components to hold the column (3). The bottom of the clamp (5) is placed on the top plate (402). Four first mounting positions (501) for placing the unloading block (10) are symmetrically provided on the top of the clamp (5). Between two first mounting positions (501) there is a downward recessed second mounting position (502) for placing the hydraulic jack (8).

7. The clamp-type composite beam according to claim 1, characterized in that: Two hydraulic jacks (8) are provided on each of the clamps (5), and four unloading blocks (10) are provided on each of the clamps (5).

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