Construction method of steel-concrete combined hybrid girder bridge

Abstract

The invention provides a steel-concrete combined mixed girder bridge construction method which comprises the following steps: S1, zero block box girder construction is respectively carried out on adjacent bridge piers, and a multifunctional hanging all-in-one machine is mounted by taking the zero block box girder as a mounting platform; s2, the multifunctional hanging all-in-one machine is used for symmetrical cantilever casting of other concrete box girders, a closure opening is formed between the two concrete box girders, and side span closure is completed with the box girders on the side piers; and S3, the combined section steel box girders and the midspan section steel box girders are machined and manufactured in a factory section by section, and the multiple midspan section steel box girders are assembled into a large section steel box girder in an assembling field. The concrete box girder is cast in a cantilever mode through the multifunctional hanging all-in-one machine, integral hoisting of the combined section steel box girder and the large section steel box girder is achieved, dependence on heavy equipment such as a large floating crane or a deck crane is effectively reduced, the construction difficulty and cost are reduced, and the construction efficiency is improved. The method has remarkable advantages under the complex construction conditions that channels are busy, the bridge floor height is large, and a crane ship is difficult to operate.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction, and particularly to a construction method for a composite steel-concrete hybrid girder bridge. Background Art

[0002] Due to the influence of the self-weight of the structure, the span of a concrete continuous girder bridge is not suitable to be designed too large. To achieve a larger span, usually, the beam segments within a certain length range from the zero-block at the pier top to the mid-span are made of concrete structure, while the remaining parts in the mid-span are made of steel box girders with lighter weight to effectively reduce the self-weight and improve the spanning ability. To further enhance the stiffness of the steel box girder and save the steel consumption, a layer of ultra-high performance concrete (UHPC) is usually poured on its top to form a steel-UHPC composite structure.

[0003] Currently, the commonly used construction methods mainly include: symmetrically cantilever casting the concrete beam using a hanging basket, and then successively suspending and assembling the steel box girder section by section using a deck crane or successively hoisting the steel box girder section by section using a floating crane, and finally pouring the UHPC layer; or assembling small-section steel beams into large-section steel box girders on the already cast concrete beam and then completing the installation by the incremental launching method, which is applicable to the case where the length of the steel box girder in the mid-span is relatively short. The above construction methods all require a large number of special equipment and auxiliary facilities, with a large amount of on-site welding work and complicated construction procedures, resulting in high construction costs and long construction periods. If a large-section steel box girder is integrally hoisted using a floating crane, it is restricted by factors such as hoisting height, beam segment length and weight, and it is difficult to ensure the installation accuracy, with high construction risks. Therefore, a construction method for a composite steel-concrete hybrid girder bridge is proposed to solve the above problems. Summary of the Invention

[0004] The main purpose of the present invention is to provide a construction method for a composite steel-concrete hybrid girder bridge, which solves the problems of strong equipment dependence, low construction efficiency, high cost and difficult control of installation accuracy existing in the existing construction methods.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a construction method for a composite steel-concrete hybrid girder bridge, the method comprising: S1. Construct the zero-block box girders on adjacent piers respectively, and use the zero-block box girders as the installation platform to install the multi-functional hanging and hoisting integrated machine; S2. Symmetrically cantilever cast the remaining concrete box girders using the multi-functional hanging and hoisting integrated machine to form a closure gap between the two concrete box girders and complete the side-span closure with the box girders on the side piers; S3. Fabricate and process the joint section steel box girder and the mid-span section steel box girders in sections at the factory, assemble multiple mid-span section steel box girders into a large-section steel box girder at the assembly yard, and pour UHPC concrete on the top plates of the joint section steel box girder and the large-section steel box girder to form a composite steel-concrete beam; S4. Transport the joint section steel box girder and the large-section steel box girder to the construction site by a beam transport ship; S5. The multi-functional hanging and hoisting integrated machine hoists the combined-section steel box girder to the closure end of the concrete box girder through the steel box girder sling, and pours the wet joint after tensioning; S6. A closure opening adjusting device is arranged between the bottom of the No. 0 block box girder and the pier and / or side pier, and the space of the closure opening is adjusted; S7. The large-section steel box girder is cut according to the measured values at the butt joint of the closure opening; S8. The multi-functional hanging and hoisting integrated machines on both sides synchronously lift the large-section steel box girder to be matched and welded with the combined-section steel box girder, and synchronously release the pushing and pulling force of the closure opening adjusting device; S9. Pour the wet joint between the combined-section steel box girder and the large-section steel box girder.

[0006] In the preferred solution, the closure opening adjusting device includes a jacking seat arranged at the bottom of the No. 0 block box girder through embedded parts, and a jacking oil cylinder corresponding to the jacking seat is arranged at the top of the pier through embedded parts. The jacking oil cylinder and the jacking seat are located on the side of the pier far from the closure opening.

[0007] In the preferred solution, the closure opening adjusting device further includes a tensioning seat arranged on the side pier platform through embedded parts, and a tensioning component is arranged between the tensioning seat and the jacking seat.

[0008] In the preferred solution, the tensioning component includes two connecting pieces respectively hinged to the tensioning seat and the jacking seat. A steel strand bundle is arranged between the two connecting pieces. The end of the steel strand bundle is fixed to the connecting piece through an anchor, and a tensioning jack for tensioning the steel strand bundle is installed on the connecting piece at the tensioning seat end; The connecting piece includes a connecting plate. The end of the connecting plate is provided with a connecting hole for hinging. Two fixing plates are symmetrically arranged on both sides of the connecting plate, and through holes for the steel strand bundle to pass through are arranged on the fixing plates.

[0009] In the preferred solution, the closure opening adjusting device further includes an operation platform arranged under the jacking seat.

[0010] In the preferred solution, the installation method of the tensioning component includes: assembling the tensioning component on the platforms of the pier and the side pier, hinging the connecting piece at the side pier end to the tensioning seat, and then lifting the connecting piece at the pier end to the top of the pier to be hinged to the jacking seat.

[0011] In the preferred solution, a lifting device for lifting the connecting piece is arranged on the side of the pier; The lifting device includes a U-shaped frame arranged on the side of the pier through embedded parts. Lifting limit rods are arranged on two opposite inner sides of the U-shaped frame. A lifting platform for installing the connecting piece is slidably arranged between the lifting limit rods. Lifting mechanisms for lifting the U-shaped lifting platform are arranged on both sides of the U-shaped frame.

[0012] In a preferred embodiment, the U-shaped frame is composed of three frame bodies with support structures, and cavities for installing lifting limit rods are arranged on the inner sides of two opposite frame bodies; The lifting platform includes a U-shaped base with an opening direction consistent with that of the U-shaped frame. First sleeves and lifting lugs are arranged on both sides of the U-shaped base. The first sleeves are slidably sleeved on the lifting limit rods. Baffles are symmetrically arranged at the tops of the two side arms of the U-shaped base. A sliding rod is arranged between the two baffles. A mounting seat for installing a connecting piece is slidably arranged on the two sliding rods. A tension spring is sleeved outside the sliding rod and is located between the baffle on the opening side and the mounting seat. Receiving grooves are arranged on the inner sides of the two side arms of the U-shaped base. A linear module is installed in the receiving grooves. An L-shaped adjusting block that can abut against the mounting seat is arranged on the sliding table of the linear module. The two L-shaped adjusting blocks are respectively located on the front and rear sides of the mounting seat; The mounting seat includes two symmetrically arranged vertical plates and a support seat located between the two vertical plates. A second sleeve that is slidably sleeved outside the sliding rod is arranged on the outer side of the vertical plate. The support seat is rotatably arranged between the two vertical plates through a rotating shaft. A contact plate is arranged at the top of the support seat close to the opening direction of the U-shaped base. A U-shaped groove for the steel wire strand to be put in and taken out is arranged on the contact plate. An inclined support plate is arranged between the contact plate and the side surface of the support seat. The connecting piece can be detachably fixed to the support seat through bolts. A fixing plate away from the opening direction of the U-shaped base is arranged between the two vertical plates.

[0013] In a preferred embodiment, the lifting mechanism includes two shaft seats arranged on the outside of the U-shaped frame. A driven shaft is arranged between the two shaft seats. A winding drum is arranged outside the driven shaft. A guide wheel is arranged at the top of the U-shaped frame. A lifting rope is arranged outside the winding drum. The lifting rope is connected to the lifting lug through the guide wheel. A support platform is also arranged on the outside of the U-shaped frame. A driving device is arranged on the support platform. A transmission gear is arranged on the output shaft of the driving device. A driven gear meshing with the transmission gear is arranged outside the driven shaft; A notch for the lifting rope to pass through is arranged at the top of the U-shaped frame.

[0014] In a preferred embodiment, the lifting device includes a secondary jacking device arranged above the U-shaped frame, which includes a plurality of jacking units symmetrically arranged in the two cavities of the U-shaped frame; The jacking unit includes a support seat and a fixed sleeve seat arranged in the cavity. A jacking oil cylinder is installed on the support seat. The fixed sleeve seat is sleeved on the outer sleeve of the jacking oil cylinder. A rotatable jacking assembly is arranged on the telescopic end of the jacking oil cylinder; The interference component includes a rotating seat arranged on the telescopic end of the jacking oil cylinder. A rotating rod is rotatably arranged on the rotating seat, and a jacking plate is arranged at the top of the rotating rod. A fixed seat is also arranged on the telescopic end of the jacking oil cylinder, and a rotating motor is installed on the fixed seat. A driving gear is installed on the output shaft of the rotating motor, and an external rotating gear meshing with the driving gear is arranged on the rotating rod. The jacking plate can be rotated into or out of the bottom of the lifting platform through rotation.

[0015] The present invention provides a construction method for a composite steel-concrete hybrid girder bridge. By using a multi-functional hanging and hoisting machine to cantilever cast a concrete box girder and realizing the integral hoisting of the combined section steel box girder and the large-section steel box girder, it effectively reduces the dependence on heavy equipment such as large floating cranes or deck cranes, reduces the construction difficulty and cost, and has significant advantages under complex construction conditions where the waterway is busy, the bridge deck height is large, and it is difficult for hoisting ships to operate. At the same time, multiple mid-span section steel box girders are assembled into a large-section steel box girder in the assembly yard, significantly reducing the number of on-site hoisting, jacking and welding workload, reducing safety risks, improving construction quality and efficiency, and greatly shortening the construction period. In addition, through the arranged closure joint adjusting device, it effectively solves the technical problem of difficult application of the jacking force for the super-wide closure joint in the mid-span, achieving the goal of reasonable structural stress and controllable construction process, and further improving the overall construction safety, efficiency and adaptability. Brief Description of the Drawings

[0016] The following further describes the present invention with reference to the drawings and embodiments: Figure 1 is the front view of the concrete box girder cast by the multi-functional hanging and hoisting machine of the present invention; Figure 2 is the cross-sectional view of the concrete box girder cast by the multi-functional hanging and hoisting machine of the present invention; Figure 3 is the hoisting structure diagram of the combined section steel box girder of the present invention; Figure 4 is the structure diagram of the closure joint adjusting device of the present invention; Figure 5 is the present invention Figure 4 enlarged view of structure A; Figure 6 is the present invention Figure 4 enlarged view of structure B; Figure 7 is the structure diagram of the tensioning component of the present invention; Figure 8 is the structure diagram of the connecting piece of the present invention; Figure 9 is the hoisting structure diagram of the large-section steel box girder of the present invention; Figure 10 is the position relationship diagram of the lifting device of the present invention; Figure 11 is the structure diagram of the lifting device of the present invention; Figure 12 It is the structure diagram of the U-shaped frame of the present invention; Figure 13 It is the connection structure diagram of the lifting limit rod, lifting platform and lifting mechanism of the present invention; Figure 14 It is the structure diagram of the lifting platform of the present invention; Figure 15 It is of the present invention Figure 14 explosion structure diagram; Figure 16 It is the structure diagram of the mounting seat of the present invention; Figure 17 It is the structure diagram of the lifting mechanism of the present invention; Figure 18 It is the structure diagram of the secondary jacking device of the present invention; Figure 19 It is of the present invention Figure 18 explosion structure diagram; In the figure: concrete box girder 1; combined section steel box girder 2; large section steel box girder 3; multi-functional hanging and hoisting machine 4; bridge pier 5; side pier 6; steel box girder spreader 7; closure joint adjusting device 8; jacking seat 801; jacking oil cylinder 802; tensioning seat 804; tensioning assembly 805; connecting piece 8050; steel strand bundle 8051; anchor 5052; tensioning jack 8053; connecting plate 8054; connecting hole 8055; fixing plate 8056; perforation 8057; operation platform 806; lifting device 9; U-shaped frame 91; frame body 910; cavity 911; notch 912; lifting limit rod 92; lifting platform 93; U-shaped base 930; first sleeve 931; lifting lug 932; baffle 933; sliding rod 934; mounting seat 935; vertical plate 9350; second sleeve 9351; support seat 9352; rotating shaft 9353; abutting plate 9354; U-shaped groove 9355; inclined support plate 9356; fixed connection plate 9357; tension spring 936; accommodating groove 937; linear module 938; L-shaped adjusting block 939; lifting mechanism 94; shaft seat 940; guide wheel 941; driven shaft 942; winding drum 943; lifting rope 944; support platform 945; driving device 946; driven gear 947; driving gear 948; secondary jacking device 95; support seat 950; jacking oil cylinder 951; fixed sleeve seat 952; rotating seat 953; rotating rod 954; jacking plate 955; rotating gear 956; fixed seat 957; rotating motor 958; driving gear 959. Detailed implementation manners

[0017] Embodiment 1 As Figure 1-9 shown, a construction method for a steel-concrete composite hybrid girder bridge, the method comprising: S1. Construct the zero-block box girders on adjacent piers 5 respectively. The construction of the zero-block box girders is carried out by the falsework method, so that they are cast on the bearings of the piers 5, and the zero-block box girders are used as the installation platform to install the multi-functional hanging and hoisting machine 4. The installed multi-functional hanging and hoisting machine 4 has the dual functions of a hanging basket and a deck crane, so that cantilever casting or steel beam lifting can be carried out. The installed multi-functional hanging and hoisting machine 4 in this embodiment can adopt the multi-functional hanging and hoisting machine proposed in Chinese Patent CN116219905A.

[0018] S2. Use the multi-functional hanging and hoisting machine to symmetrically cantilever cast the remaining concrete box girders 1. The multi-functional hanging and hoisting machine cooperates with the hanging basket underframe, suspension straps and formwork system to continue cantilever casting. The specific process is the existing technology in this field, so it will not be described in detail here. Make a closure gap between the two concrete box girders 1 and complete the side-span closure with the box girders on the side piers 6.

[0019] S3. Fabricate the combined-section steel box girder 2 and the mid-span section steel box girders in sections in the factory. Assemble multiple mid-span section steel box girders into a large-section steel box girder 3 in the assembly yard, and pour UHPC concrete on the top plates of the combined-section steel box girder 2 and the large-section steel box girder 3 to form a steel-concrete composite beam. The specific steps for the formation of the large-section steel box girder 3 include: sectionally and matchingly process the mid-span section steel box girders in the factory; transport multiple mid-span section steel box girders to the general assembly yard and assemble them into a large-section steel box girder 3 according to the overall coordinate system of the designed bridge shape; weld shear studs on the top plate of the large-section steel box girder 3 and install a steel bar mesh; pour UHPC concrete on the top plate of the steel box girder to form a steel-UHPC composite structure, and reserve tongue-and-groove wet joints at both ends of the steel beam; steam moisture conservation for the steel-UHPC concrete.

[0020] S4. The beam transport ship transports the combined-section steel box girder 2 and the large-section steel box girder 3 to the construction site.

[0021] S5. The multi-functional hanging and hoisting machine 4 hoists the combined-section steel box girder 2 to the closure end of the concrete box girder 1 through the steel box girder sling 7. Before that, it is necessary to remove the hanging basket underframe, suspension straps and formwork system of the multi-functional hanging and hoisting machine 4 used for cantilever casting, and pour the wet joint after tensioning to complete the connection between the combined-section steel box girder 2 and the steel box girder sling 7. The specific steps for hoisting the combined-section steel box girder 2 include: removing the hanging basket underframe, suspension straps and formwork system of the multi-functional hanging and hoisting machine 4; replacing the steel box girder sling 7 of the lifting system; transporting the beam by the beam transport ship to the designated position for positioning; lowering the sling and adjusting the position, and connecting the sling with the steel beam lifting lug; the multi-functional hanging and hoisting machine 4 hoists the combined-section steel box girder 2 to the closure end of the concrete box girder 1; pouring the wet joint after tensioning.

[0022] S6. A closure joint adjusting device 8 is provided between the bottom of the zero-block box and the pier 5 and / or the side pier 6, and the closure joint space is adjusted. The closure joint space is appropriately enlarged through the closure joint adjusting device 8 to facilitate the installation of the large-section steel box girder 3.

[0023] S7. The large-section steel box girder 3 is cut according to the measured values at the docking position of the closure joint, so that the closure ends match. Before that, it is necessary to measure and observe the width and elevation of the closure joint, and the measurement and observation time is 72 hours.

[0024] S8. The multi-functional hanging and lifting machines 4 on both sides synchronously lift the large-section steel box girder 3 and match and weld it with the combined-section steel box girder 2, and synchronously release the pushing and pulling force of the closure joint adjusting device 8.

[0025] S9. Pour the wet joint between the combined-section steel box girder 2 and the large-section steel box girder 3, and finally carry out the corresponding bridge deck system construction.

[0026] With such a design, the large-section steel box girder 3 on the beam transport ship can be directly hoisted by the multi-functional hanging and lifting machine 4 to achieve the one-time assembly of the ultra-wide closure section, reducing the on-site construction operation procedures, effectively avoiding multiple on-site hoisting, jacking and a large amount of welding, reducing the safety risk, ensuring the construction quality, saving the construction time, improving the construction efficiency, which has obvious advantages for the construction conditions with busy waterways, large bridge deck heights and difficult operation of the lifting ship. At the same time, the investment in large floating cranes or bridge deck cranes is reduced. In addition, the technical problem of difficult application of the top thrust for the ultra-wide closure joint in the middle of the span can be effectively solved through the closure joint adjusting device 8.

[0027] In the preferred solution, the closure joint adjusting device 8 includes a jacking seat 801 arranged at the bottom of the zero-block box girder through embedded parts. A jacking oil cylinder 802 corresponding to the jacking seat 801 is arranged at the top of the pier 5 through embedded parts. The telescopic end of the jacking oil cylinder 802 is connected to the jacking seat 801. The jacking oil cylinder 802 and the jacking seat 801 are located on the side of the pier 5 away from the closure joint, so that the concrete box girder 1 can be pushed by the jacking of the jacking oil cylinder 802 to adjust the closure joint space.

[0028] Furthermore, the closure joint adjusting device 8 further includes a tensioning seat 804 arranged on the platform of the side pier 6 through embedded parts, and a tensioning assembly 805 is arranged between the tensioning seat 804 and the jacking seat 801.

[0029] Among them, the tensioning assembly 805 includes two connecting members 8050 respectively hinged to the tensioning seat 804 and the pushing seat 801. It should be noted that corresponding hinge seats are provided on both the tensioning seat 804 and the pushing seat 801. A steel strand bundle 8051 is arranged between the two connecting members 8050. The end of the steel strand bundle 8051 is fixed to the connecting member 8050 through an anchor 5052, and a tensioning jack 8053 for tensioning the steel strand bundle 8051 is installed on the connecting member 8050 at the tensioning seat 804 end.

[0030] With such a design, the tensioning jack 8053 can apply a pushing force to the steel strand bundle 8051, so as to use the pushing seat 801 to apply a pulling force to the concrete box girder 1. Combining with the pushing action of the pushing oil cylinder 802, the coordinated combination of the horizontal pushing force and the pulling force can be realized.

[0031] The specific implementation method is as follows: According to the pushing force required for the mid-span closure provided by the design drawings, combined with the maximum bearing capacity of the pier structure, the force analysis is carried out, and the pushing force is reasonably decomposed into a horizontal pushing force and a pulling force; then the pushing force and the pulling force are applied to the concrete box girder 1 synchronously, so as to accurately adjust the width of the closure opening and ensure a smooth closure.

[0032] The connecting member 8050 includes a connecting plate 8054. The end of the connecting plate 8054 is provided with a connecting hole 8055 for hinging. Two fixing plates 8056 are symmetrically arranged on both sides of the connecting plate 8054. The fixing plate 8056 is provided with a through hole 8057 for the steel strand bundle 8051 to pass through, so as to meet the requirements for anchoring the steel strand bundle 8051 and hinging its end.

[0033] In this embodiment, the number of the steel strand bundles 8051 is two, corresponding to the fixing plates 8056 on both sides of the connecting plate 8054 respectively. In addition, the distance between the connecting hole 8055 and the fixing plate 8056 should meet the space required for the operation of the tensioning jack 8053.

[0034] It should be noted that the anchoring of the anchor 5052 and the installation of the tensioning jack 8053 are both prior arts in the field of prestressed tensioning, so they will not be described in detail here.

[0035] In the preferred solution, the closure opening adjusting device 8 further includes an operation platform 806 arranged under the pushing seat 801, which is convenient for construction personnel to stand on it to perform relevant construction operations.

[0036] In addition, the installation method of the tensioning assembly 805 includes: assembling the tensioning assembly 805 on the bearing platforms of the bridge pier 5 and the side pier 6, hinging the connecting member 8050 at the side pier 6 end with the tensioning seat 804, and then lifting the connecting member 8050 at the bridge pier 5 end to the top of the bridge pier 5 and hinging it with the jacking seat 801; designed in this way, the perforation and anchoring work of the steel strand bundle 8051 can be avoided at high altitude, reducing the convenience of its installation.

[0037] Embodiment 2 As Figure 9-19 shown, in combination with the construction method of a steel-concrete composite hybrid girder bridge in the above-mentioned Embodiment 1, this embodiment proposes a lifting device 9 for installing the tensioning assembly 805, which is arranged on the side of the bridge pier 5 and has a height matching the height required when the tensioning assembly 805 is lifted.

[0038] Among them, the lifting device 9 includes a U-shaped frame 91 arranged on the side of the bridge pier 5 through embedded parts. Lifting limit rods 92 are arranged on both opposite inner sides of the U-shaped frame 91. A lifting platform 93 for installing the connecting member 8050 is slidably arranged between the lifting limit rods 92. Lifting mechanisms 94 for lifting the U-shaped lifting platform 93 are arranged on both sides of the U-shaped frame 91.

[0039] Designed in this way, the connecting member 8050 that needs to be lifted by the tensioning assembly 805 can be installed on the lifting platform 93, and then the lifting mechanism 94 is used to make the lifting platform 93 slide on the lifting limit rods 92, so as to send the connecting member 8050 to the height required for hinging with the jacking seat 801. The opening of the U-shaped frame 91 faces the direction of the tensioning seat 804, facilitating the steel strand bundle 8051 to be unaffected by the lifting.

[0040] In a preferred solution, the U-shaped frame 91 is composed of three frame bodies 910 with support structures. Cavities 911 for installing the lifting limit rods 92 are arranged on the inner sides of the two opposite frame bodies 910. In this embodiment, the number of lifting limit rods 92 is four, which are vertically and symmetrically arranged in the two cavities 911.

[0041] The lifting platform 93 includes a U-shaped base 930 with an opening direction consistent with that of the U-shaped frame 91, facilitating the steel strand bundle 8051 to be unaffected by its lifting. Four first sleeves 931 and lifting lugs 932 are arranged on both sides of the U-shaped base 930. The number of the first sleeves 931 and the lifting lugs 932 is four each, which are symmetrically arranged on both sides of the U-shaped base 930 and do not interfere with each other. The first sleeves 931 are slidably sleeved on the lifting limit rods 92, so that the U-shaped base 930 can be lifted and lowered on the lifting limit rods 92.

[0042] On the top of both side arms of the U-shaped base 930, baffles 933 are symmetrically arranged. A sliding rod 934 is arranged between the two baffles 933. The length of the sliding rod 934 should meet the lateral movement requirements of the connecting piece 8050 during the ascending process. A mounting seat 935 for mounting the connecting piece 8050 is slidably arranged on the two sliding rods 934. A tension spring 936 is sleeved outside the sliding rod 934 and is located between the baffle 933 on the opening side and the mounting seat 935. Thus, the tension force of the tension spring 936 can be utilized to appropriately maintain the tension of the steel strand bundle 8051 when the connecting piece 8050 ascends, prevent it from sagging excessively, and at the same time facilitate controlling the installation progress of the connecting piece 8050 on the jacking seat 801.

[0043] On the inner sides of both side arms of the U-shaped base 930, receiving grooves 937 are arranged. A linear module 938 is installed in the receiving groove 937. An L-shaped adjusting block 939 that can be in contact with the mounting seat 935 is arranged on the sliding table of the linear module 938. The two L-shaped adjusting blocks 939 are respectively located on the front and back sides of the mounting seat 935. Thus, the linear module 938 can be used to control the sliding of the L-shaped adjusting block 939 on it. Furthermore, when the connecting piece 8050 is docked with the jacking seat 801, the positions of the connecting piece 8050 can be finely adjusted by the separate movement of the two L-shaped adjusting blocks 939. At the same time, during its lifting and lowering process, the tension of the steel strand bundle 8051 can be adjusted in cooperation with the tension spring 936.

[0044] The mounting seat 935 includes two symmetrically arranged vertical plates 9350 and a support seat 9352 located between the two vertical plates 9350. On the outer side of the vertical plate 9350, a second sleeve 9351 that is slidably sleeved outside the sliding rod 934 is arranged. The support seat 9352 is rotatably arranged between the two vertical plates 9350 through a rotating shaft 9353. Bearings adapted to the rotating shaft 9353 are arranged on the vertical plates 9350. A contact plate 9354 is arranged on the top of the support seat 9352 close to the opening direction of the U-shaped base 930. A U-shaped groove 9355 for the steel strand bundle 8051 to be put in and taken out is arranged on the contact plate 9354. An inclined support plate 9356 is arranged on the side of the contact plate 9354 and the support seat 9352. The connecting piece 8050 can be detachably fixed to the support seat 9352 through bolts. A fixing plate 9357 away from the opening direction of the U-shaped base 930 is arranged between the two vertical plates 9350.

[0045] With such a design, while ensuring the structural strength of the mounting seat 935, it can cooperate with the required angular changes of the connecting piece 8050 during the lifting and lowering process.

[0046] In addition, it should be noted that the support height of the mounting seat 935 meets the installation requirements of the connecting piece 8050 after the lifting platform 93 rises to the top.

[0047] In a preferred embodiment, the lifting mechanism 94 includes two shaft seats 940 disposed outside the U-shaped frame 91. A driven shaft 942 is arranged between the two shaft seats 940. A winding and unwinding cylinder 943 is disposed outside the driven shaft 942. A guide wheel 941 is arranged at the top of the U-shaped frame 91. The position of the guide wheel 941 corresponds to that of the winding and unwinding cylinder 943. In this embodiment, the number of both the guide wheel 941 and the winding and unwinding cylinder 943 is two. A lifting rope 944 is disposed outside the winding and unwinding cylinder 943. The lifting rope 944 is connected to the corresponding lifting lug 932 via the guide wheel 941. A support platform 945 is further arranged outside the U-shaped frame 91. A driving device 946 is arranged on the support platform 945. The driving device 946 is composed of a motor and a reducer transmission combination. A transmission gear 948 is arranged on the output shaft of the driving device 946. A driven gear 947 meshing with the transmission gear 948 is disposed outside the driven shaft 942.

[0048] With such a design, the driven shaft 942 can be driven by the driving device 946 to drive the two winding and unwinding cylinders 943 to rotate synchronously, so as to meet the lifting requirements of the lifting platform 93 by winding and unwinding the lifting rope 944.

[0049] A notch 912 for the lifting rope 944 to pass through is arranged at the top of the U-shaped frame 91. In a preferred embodiment, the lifting device 9 includes a secondary lifting device 95 arranged above the U-shaped frame 91. The secondary lifting device 95 includes a plurality of lifting units symmetrically arranged in the two cavities 911 of the U-shaped frame 91. In this embodiment, the number of the lifting units is four, and they are symmetrically arranged in pairs in the two cavities 911. It should be noted that it does not interfere with the lifting limit rod 92 and the lifting rope 944. At the same time, since it is arranged in the cavity 911, it can avoid interfering with the normal lifting of the lifting platform 93.

[0050] The lifting unit includes a support seat 950 and a fixed sleeve seat 952 arranged in the cavity 911. The support seat 950 and the fixed sleeve seat 952 are fixed on the inner wall of the cavity 911. When necessary, a diagonal brace can be arranged at the bottom to improve its supportability. A lifting oil cylinder 951 is installed on the support seat 950. The fixed sleeve seat 952 is sleeved on the outer sleeve of the lifting oil cylinder 951. A rotatable lifting assembly is arranged on the telescopic end of the lifting oil cylinder 951.

[0051] Among them, the resistance component includes a rotating seat 953 arranged on the telescopic end of the jacking cylinder 951, a rotating rod 954 is rotatably arranged on the rotating seat 953, a concave and convex rotating matching structure is arranged between the rotating seat 953 and the rotating rod 954 to prevent the rotating rod 954 from being detached, a lifting plate 955 is arranged on the top of the rotating rod 954, and a fixed seat 957 is also arranged on the telescopic end of the jacking cylinder 951, a rotating motor 958 is installed on the fixed seat 957, a driving gear 959 is installed on the output shaft of the rotating motor 958, and a rotating gear 956 meshing with the rotating gear 959 is arranged on the outside of the rotating rod 954.

[0052] With such a design, the jacking plate 955 can be driven to rotate by the rotating motor 958, so that the jacking plate 955 can be rotated into or out of the bottom of the lifting platform 93. When the lifting platform 93 rises to the top of the jacking plate 955, the jacking plate is rotated to the bottom of the lifting platform, and the lifting platform is lifted twice by the jacking cylinder 951. This operation method ensures that the connector 8050 and the steel strand bundle 8051 can still obtain the necessary lifting force after being lifted to a high place; in addition, the jacking cylinder 951 not only provides stability for the connection between the connector 8050 and the jacking seat 801, but also supports more precise lifting control, thereby ensuring the smooth operation and precise adjustment of the entire system, which not only improves the high adaptability of the operation, but also enhances the safety and controllability of the overall structure.

[0053] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A construction method for a hybrid girder bridge with a steel-concrete combination, characterized by: The method includes: S1. Construct the No. 0 block box girder on adjacent piers (5) respectively, and use the No. 0 block box girder as an installation platform to install the multi-functional hanging and hoisting integrated machine (4); S2. Use the multi-functional hanging and hoisting integrated machine to symmetrically cantilever cast the remaining concrete box girders (1), form a closure gap between the two concrete box girders (1), and complete the side span closure with the box girder on the side pier (6); S3. Fabricate the composite section steel box girder (2) and the mid-span section steel box girder in sections in the factory, assemble multiple mid-span section steel box girders into a large section steel box girder (3) in the assembly yard, and pour UHPC concrete on the top plates of the composite section steel box girder (2) and the large section steel box girder (3) to form a steel-concrete composite beam; S4. The beam transport ship transports the composite section steel box girder (2) and the large section steel box girder (3) to the construction site; S5. The multi-functional hanging and hoisting integrated machine (4) hoists the composite section steel box girder (2) to the closure end of the concrete box girder (1) through the steel box girder sling (7), and pours the wet joint after tensioning; S6. A closure gap adjusting device (8) is provided between the bottom of the No. 0 block box and the pier (5) and / or the side pier (6), and the space of the closure gap is adjusted; S7. Perform profiling cutting on the large section steel box girder (3) according to the measured values at the docking part of the closure gap; S8. The multi-functional hanging and hoisting integrated machines (4) on both sides synchronously lift the large section steel box girder (3) and the composite section steel box girder (2) for matching welding, and synchronously release the pushing and pulling force of the closure gap adjusting device (8); S9. Pour the wet joint between the composite section steel box girder (2) and the large section steel box girder (3).

2. The construction method of a composite steel-concrete hybrid girder bridge according to claim 1, characterized in that: The closure gap adjusting device (8) includes a jacking seat (801) arranged at the bottom of the No. 0 block box girder through embedded parts, and a jacking oil cylinder (802) corresponding to the jacking seat (801) is arranged at the top of the pier (5) through embedded parts. The jacking oil cylinder (802) and the jacking seat (801) are located on the side of the pier (5) away from the closure gap.

3. The construction method of a hybrid girder bridge with a steel-concrete combination according to claim 2, characterized in that: The closure gap adjusting device (8) further includes a tensioning seat (804) arranged on the side pier (6) platform through embedded parts, and a tensioning assembly (805) is arranged between the tensioning seat (804) and the jacking seat (801).

4. The construction method of a hybrid girder bridge with a steel-concrete combination according to claim 3, characterized in that: The tensioning assembly (805) includes two connecting pieces (8050) respectively hinged to the tensioning seat (804) and the jacking seat (801). A steel strand bundle (8051) is arranged between the two connecting pieces (8050). The end of the steel strand bundle (8051) is fixed to the connecting piece (8050) through an anchor (5052), and a tensioning jack (8053) for tensioning the steel strand bundle (8051) is installed on the connecting piece (8050) at the tensioning seat (804) end; The connecting piece (8050) includes a connecting plate (8054). The end of the connecting plate (8054) is provided with a connecting hole (8055) for hinging. Two fixing plates (8056) are symmetrically arranged on both sides of the connecting plate (8054), and a perforation (8057) for the steel strand bundle (8051) to pass through is arranged on the fixing plate (8056).

5. A construction method for a hybrid girder bridge with a steel-concrete combination according to any one of claims 2-4, characterized in that: The closure gap adjusting device (8) further includes an operation platform (806) arranged below the jacking seat (801).

6. The construction method of a composite steel-concrete hybrid girder bridge according to claim 4, characterized in that: The installation method of the tensioning assembly (805) includes: assembling the tensioning assembly (805) on the bearing platforms of the bridge pier (5) and the side pier (6), hinging the connecting piece (8050) at the side pier (6) end with the tensioning seat (804), and then lifting the connecting piece (8050) at the bridge pier (5) end to the top of the bridge pier (5) to be hinged with the jacking seat (801).

7. The construction method of a hybrid girder bridge with a steel-concrete combination according to claim 6, characterized in that: A lifting device (9) for lifting the connecting piece (8050) is arranged on the side of the bridge pier (5); The lifting device (9) includes a U-shaped frame (91) arranged on the side of the bridge pier (5) through embedded parts. Lifting limit rods (92) are arranged on both opposite inner sides of the U-shaped frame (91). A lifting platform (93) for installing the connecting piece (8050) is slidably arranged between the lifting limit rods (92). Lifting mechanisms (94) for lifting the U-shaped lifting platform (93) are arranged on both sides of the U-shaped frame (91).

8. The construction method of a hybrid girder bridge with a steel-concrete combination according to claim 7, characterized in that: The U-shaped frame (91) is composed of three frame bodies (910) with support structures. Cavities (911) for installing the lifting limit rods (92) are arranged on the inner sides of the two opposite frame bodies (910); The lifting platform (93) includes a U-shaped base (930) with an opening direction consistent with that of the U-shaped frame (91). First sleeves (931) and lifting lugs (932) are arranged on both sides of the U-shaped base (930). The first sleeves (931) are slidably sleeved on the lifting limit rods (92). Baffles (933) are symmetrically arranged at the tops of the two side arms of the U-shaped base (930). A sliding rod (934) is arranged between the two baffles (933). An installation seat (935) for installing the connecting piece (8050) is slidably arranged on the two sliding rods (934). A tension spring (936) is sleeved outside the sliding rod (934) between the baffle (933) on the opening side and the installation seat (935). Receiving grooves (937) are arranged on the inner sides of the two side arms of the U-shaped base (930). Linear modules (938) are installed in the receiving grooves (937). L-shaped adjusting blocks (939) that can abut against the installation seat (935) are arranged on the sliding platforms of the linear modules (938). The two L-shaped adjusting blocks (939) are respectively located on the front and rear sides of the installation seat (935); The mounting seat (935) comprises two symmetrically arranged vertical plates (9350) and a support seat (9352) located between the two vertical plates (9350). A second sleeve (9351) slidably sleeved on the outside of the sliding rod (934) is arranged on the outer side of the vertical plates (9350). The support seat (9352) is rotatably arranged between the two vertical plates (9350) via a rotating shaft (9353). The top of the support seat (9352) is arranged near the opening direction of the U-shaped base (930). A contact plate (9354) is provided, and a U-shaped groove (9355) is provided on the contact plate (9354) for the steel strand bundle (8051) to be placed in and released out. A diagonal support plate (9356) is provided on the side of the contact plate (9354) and the support seat (9352). The connecting piece (8050) can be detachably fixed to the support seat (9352) by bolts. A fixing plate (9357) is provided between the two vertical plates (9350) away from the opening direction of the U-shaped base (930).

9. The construction method of a hybrid girder bridge with a steel-concrete combination according to claim 8, characterized in that: The lifting mechanism (94) comprises two shaft seats (940) arranged outside the U-shaped frame (91), a driven shaft (942) is arranged between the two shaft seats (940), a retracting cylinder (943) is arranged outside the driven shaft (942), a guide wheel (941) is arranged at the top of the U-shaped frame (91), a lifting rope (944) is arranged outside the retracting cylinder (943), the lifting rope (944) is connected to the lifting lug (932) via the guide wheel (941), a support platform (945) is arranged outside the U-shaped frame (91), a driving device (946) is arranged on the support platform (945), a transmission gear (948) is arranged on the output shaft of the driving device (946), and a driven gear (947) meshing with the transmission gear (948) is arranged outside the driven shaft (942); The top of the U-shaped frame (91) is provided with a notch (912) for the lifting rope (944) to pass through.

10. The construction method of a steel-concrete composite hybrid girder bridge according to claim 8 or 9, characterized in that: The lifting device (9) comprises a secondary lifting device (95) arranged above the U-shaped frame (91), which comprises a plurality of lifting units symmetrically arranged in two cavities (911) of the U-shaped frame (91); The lifting unit comprises a support seat (950) and a fixed sleeve seat (952) arranged in the cavity (911); a lifting cylinder (951) is installed on the support seat (950); the fixed sleeve seat (952) is sleeved on the outer sleeve of the lifting cylinder (951); and a rotatable lifting component is arranged on the telescopic end of the lifting cylinder (951); The resistance component comprises a rotating seat (953) arranged on the telescopic end of the lifting cylinder (951), a rotating rod (954) is rotatably arranged on the rotating seat (953), a lifting plate (955) is arranged on the top of the rotating rod (954), a fixed seat (957) is also arranged on the telescopic end of the lifting cylinder (951), a rotating motor (958) is installed on the fixed seat (957), a driving gear (959) is installed on the output shaft of the rotating motor (958), a rotating gear (956) meshing with the rotating gear (959) is arranged on the outside of the rotating rod (954), and the lifting plate (955) can be rotated to or from the bottom of the lifting platform (93).

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