Urban existing road steel box girder temporary support and steel box girder installation method

Abstract

The invention relates to the technical field of viaduct construction, in particular to an urban existing road steel box girder temporary support and a steel box girder mounting method. The opposite seam guide frame is mounted at the upper end of the supporting frame body and comprises two guide components, and the two guide components are obliquely arranged outwards in the working state; when the steel box girder abuts against any guide component, the steel box girder can slide downwards relative to the guide component so that the steel box girder can be guided to a bearing position set on the supporting frame body, and then butt joint guiding is provided for the steel box girder through the butt joint guide frame. Therefore, after the steel box girders are in lap joint with the temporary supports, only the elevation and the welding seam width need to be adjusted, staggered joint adjustment is not needed, the butt joint efficiency of the steel box girders is greatly improved, and the influence on urban existing road traffic is reduced. The steel box girder mounting method is based on the temporary support.

Description

Technical Field

[0001] The present invention relates to the technical field of viaduct construction, and particularly to a temporary support for a steel box girder on an existing urban road and a method for installing the steel box girder. Background Art

[0002] The steel box girder is a structural form commonly used in engineering. Especially in municipal viaducts, the steel box girder has been rapidly developed in China due to its good torsional resistance and fast construction speed. However, during the construction of a steel box girder viaduct in an urban sensitive area, it may face the problem that the viaduct needs to cross existing main roads and other ramp bridges, and the main concrete beam and ramp concrete beam and steel beam of the main line are spatially intertwined. When installing the steel box girder, the following aspects need to be considered: the large span and large curvature of the steel box girder; the narrow construction site, sandwiched in the middle of the road; the large traffic flow and large pedestrian flow on the road. Therefore, how to safely and efficiently install the steel box girder in place is a problem that must be faced.

[0003] Traditional hoisting of steel box girders uses single-machine hoisting. Therefore, the weight of the steel box girder segments is limited, resulting in a large number of welding times during the subsequent splicing process of the steel box girder, which has a significant impact on the assembly quality of the steel box girder. An alternative solution is to fabricate the steel box girder in segments, avoid the main beam support points and the vicinity of the mid-span at the segment joints, avoid the wheel track line position at the longitudinal splicing joints, and make the segment size as large as possible to reduce the number of splicing welds and meet the requirements of transportation and on-site hoisting under the premise that the segment length and weight are reasonable.

[0004] Among them, due to the large span of the steel box girder, temporary supports must be set at the segment joints during installation. To ensure the accuracy of the position of the steel box girder, after each beam segment is erected, it is necessary to adjust the weld width and the misalignment of the top and bottom plates between adjacent beam segments, and the elevation, weld width, and misalignment fine-tuning operations are mainly completed by the jacks on the crane and the temporary support, resulting in a long docking operation time for the steel box girder and low docking efficiency. Summary of the Invention

[0005] Aiming at the technical problem of low docking efficiency at the segment joints of the existing steel box girder, the present invention provides a temporary support for a steel box girder on an existing urban road and a method for installing the steel box girder. The seam alignment guide frame provides seam alignment guidance for the steel box girder, so that after the steel box girder is lapped on the temporary support, only the elevation and weld width need to be adjusted, and no misalignment adjustment is required, thereby greatly improving the docking efficiency of the steel box girder and reducing the impact on the existing urban road traffic.

[0006] The present invention is realized by the following technical solutions: In the first aspect, the present invention provides a temporary support for steel box girders on existing urban roads, comprising: a support frame; a seam guide frame installed at the upper end of the support frame, comprising two guide members, both of which are inclined outward in a working state; wherein, when the steel box girder abuts against any of the guide members, it can slide downward relative to the guide member to guide the steel box girder to a receiving position set on the support frame.

[0007] The temporary support for steel box girders of existing urban roads provided by the present invention comprises a support frame body and a seam guide frame, wherein the seam guide frame is installed at the upper end of the support frame body, and the seam guide frame comprises two guide components, and the guide components are both inclined outwards in the working state. When hoisting the steel box girder, the steel box girder is hoisted to the upper end of the support frame body by hoisting equipment, so that the corresponding end of the steel box girder is directly opposite to the upper part of the guide groove surrounded by the two guide components, and then the steel box girder is lowered, so that the steel box girder is directly placed at the receiving position set at the upper end of the support frame body, or contacts any guide component and slides downward relative to the guide component, so that the steel box girder is guided to the receiving position set on the support frame body by the guiding action of the guide component.

[0008] Therefore, the temporary support for steel box girders of existing urban roads provided by the present invention can provide seam guidance for steel box girders, so that there is no staggered gap after the steel box girders are overlapped on the temporary support. Only the elevation and weld width need to be adjusted without staggered adjustment, thereby greatly improving the efficiency of steel box girder docking and reducing the impact on existing urban road traffic.

[0009] In an optional embodiment of the present application, the guide member is adapted to be equipped with a plurality of guide rollers; the plurality of guide rollers are arranged in sequence at intervals along the length direction of the corresponding guide member, and each of the guide rollers at least partially protrudes from the inner side surface of the guide member, so that the steel box girder is in contact with the guide rollers, and the guide rollers rotate along their own axes to drive the steel box girder to slide downward along the length direction of the guide member, thereby reducing the resistance of the steel box girder to sliding downward, ensuring that the guide member can provide a guiding effect on the steel box girder.

[0010] In an optional embodiment of the present application, the seam guide frame is slidably connected to the support frame body; and it also includes a lifting hydraulic cylinder, which is installed on the support frame body and has a moving end drivingly connected to the seam guide frame; wherein, under the contraction of the lifting hydraulic cylinder, the seam guide frame can be folded on one side of the support frame body, so that when the steel box is hoisted upwards, the seam guide frame is driven downward by the lifting hydraulic cylinder and folded on one side of the support frame body, thereby avoiding increasing the hanging height and the length of the hanging path of the steel box girder due to the provision of the seam guide frame, thereby ensuring that the lifting equipment can quickly hoist the steel box girder above the support frame.

[0011] In an optional embodiment of the present application, it also includes a vertical slide, which is slidably installed on one side of the support frame and is transmission-connected to the movable end of the lifting hydraulic cylinder; the middle part of the guide member is hinged to the top corresponding to the vertical slide; the seam guide frame also includes an open-arm hydraulic cylinder, and both ends of the open-arm hydraulic cylinder are respectively hinged to the corresponding lower end of the guide member.

[0012] The extension and retraction of the open-arm hydraulic cylinder controls the opening and retraction of the guide members, so that when the seam guide frame slides to the upper end of the support frame body, the contraction of the open-arm hydraulic cylinder will drive the two guide members to tilt outward, so that both guide members tilt outward in the working state, and are connected into a whole through the open-arm hydraulic cylinder and the vertical slide, ensuring that the guide members have sufficient carrying capacity. Accordingly, the two guide members are driven to reset by the extension of the open-arm hydraulic cylinder, so that when the lifting hydraulic cylinder is contracted, the seam guide frame is moved downward and folded on one side of the support frame body.

[0013] In an optional embodiment of the present application, connecting slide grooves are vertically installed on both sides of the support frame body, and the side walls of the vertical slide are installed in the corresponding connecting slide grooves to achieve a sliding connection between the vertical slide and the support frame body.

[0014] In an optional embodiment of the present application, a supporting cross arm is provided in the middle of the supporting frame, the supporting cross arm is arranged transversely, and the lifting hydraulic cylinder is installed on the supporting cross arm to facilitate the installation of the lifting hydraulic cylinder while improving the structural strength of the supporting frame.

[0015] In an optional embodiment of the present application, the seam guide frame also includes a telescopic hydraulic rod, and the oil storage chamber of the telescopic hydraulic rod is connected to a hydraulic accumulator via a stop valve; one end of the telescopic hydraulic rod is hinged to the corresponding upper section of the guide member, and the other end is hinged to the corresponding part of the upper end of the support frame body, so as to form a triangular support structure with the support frame body and the guide member in a working state, thereby further improving the load capacity of the seam guide frame and avoiding damage to the seam guide frame when the staggered amount of the steel box girder is large.

[0016] In an optional embodiment of the present application, the telescopic hydraulic rod includes: a connecting cylinder with closed ends and one end hinged to the support frame; a piston rod, a piston section of which is inserted into the connecting cylinder and adapted to the connecting cylinder, and the other end is hinged to the corresponding guide member; wherein the inner cavity of one end of the connecting cylinder away from the piston rod is connected to the hydraulic accumulator to ensure that the telescopic hydraulic rod can freely extend and retract with the movement of the guide member to avoid interference with the extension and retraction of the open arm hydraulic cylinder.

[0017] In an alternative embodiment of the present application, a receiving platform is provided at the upper end of the support frame body. A plurality of jacks are horizontally and spaced apart on the receiving platform. The receiving platform is located on one side of the two guiding members in the length direction, so as to finely adjust the elevation of the steel box girder lapped on the support frame body.

[0018] Secondly, the present invention provides a method for installing a steel box girder on an existing urban road, based on the above-mentioned temporary support for the steel box girder on the existing urban road, including the following steps: S10. Erect the above-mentioned temporary support for the steel box girder on the existing urban road at the position corresponding to the connection section of the steel box girder, and make the butt joint guiding frame in a standby state; S20. Lift the corresponding end of the steel box girder above the support frame body, and then make the butt joint guiding frame in a working state; S30. Lower the steel box girder so that the corresponding end of the steel box girder is lapped on the upper end of the support frame body after being guided by the butt joint guiding frame; S40. Adjust the weld width and elevation of the end of the steel box girder; S50. After the weld width and elevation of the steel box girder meet the design requirements, weld adjacent steel box girders.

[0019] The method for installing a steel box girder on an existing urban road provided by the present invention first erects the above-mentioned temporary support for the steel box girder on the existing urban road at the position corresponding to the connection section of the steel box girder, and makes the butt joint guiding frame in a standby state. Then, lift the corresponding end of the steel box girder above the support frame body, and then make the butt joint guiding frame in a working state, and lower the steel box girder so that the corresponding end of the steel box girder is lapped on the upper end of the support frame body after being guided by the butt joint guiding frame, so as to guide the steel box girder to the set receiving position on the support frame body. Finally, adjust the weld width and elevation of the end of the steel box girder, and after the weld width and elevation of the steel box girder meet the design requirements, weld adjacent steel box girders. During the installation process, only the elevation and weld width need to be adjusted, and there is no need to adjust the staggered joints, which can greatly improve the docking efficiency of the steel box girder and reduce the impact on the existing urban road traffic.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The temporary support for the existing steel box girder of urban roads provided by the present invention includes a support frame body and a seam alignment guide frame. The seam alignment guide frame is installed at the upper end of the support frame body. At the same time, the seam alignment guide frame includes two guide members, and the guide members are both inclined outward in the working state. When hoisting the steel box girder, the steel box girder is hoisted to the upper end of the support frame body by a hoisting device, so that the corresponding end of the steel box girder is directly above the guide groove formed by the two guide members. Then, the steel box girder is lowered, so that the steel box girder is directly placed at the set receiving position at the upper end of the support frame body, or abuts against any one of the guide members and slides downward relative to the guide member. Thus, through the guiding action of the guide member, the steel box girder is guided to the set receiving position on the support frame body, so that there is no staggered joint gap after the steel box girder is lapped on the temporary support, and only the elevation and weld width need to be adjusted, without the need for staggered joint adjustment, thereby greatly improving the docking efficiency of the steel box girder and reducing the impact on the existing urban road traffic.

[0021] 2. The installation method of the existing steel box girder of urban roads provided by the present invention is as follows: First, the above-mentioned temporary support for the existing steel box girder of urban roads is erected at the corresponding position of the steel box girder connection section, and the seam alignment guide frame is in a standby state. Then, the corresponding end of the steel box girder is hoisted above the support frame body, and then the seam alignment guide frame is put into the working state, and the steel box girder is lowered, so that the corresponding end of the steel box girder is lapped on the upper end of the support frame body after being guided by the seam alignment guide frame, so as to guide the steel box girder to the set receiving position on the support frame body. Finally, the weld width and elevation of the end of the steel box girder are adjusted. After the weld width and elevation of the steel box girder meet the design requirements, the adjacent steel box girders are welded. During the installation process, only the elevation and weld width need to be adjusted, without the need for staggered joint adjustment, thereby greatly improving the docking efficiency of the steel box girder and reducing the impact on the existing urban road traffic. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] In the drawings: Figure 1 is a schematic structural diagram of the temporary support for the existing steel box girder of urban roads provided by the embodiment of the present application; Figure 2 is a schematic structural diagram of the working state of the seam alignment guide frame adapted to the temporary support for the existing steel box girder of urban roads provided by the embodiment of the present application; Figure 3 is Figure 2 an enlarged structural diagram of part A of Figure 4 A schematic flow chart of a method for installing steel box girders on existing urban roads provided in an embodiment of the present application.

[0024] Reference numerals and corresponding component names in the accompanying drawings: 100-support frame, 110-lifting hydraulic cylinder, 120-connecting slide, 130-supporting cross arm, 140-receiving platform, 141-jack, 200-joint guide frame, 210-guide member, 211-guide roller, 220-opening arm hydraulic cylinder, 230-telescopic hydraulic rod, 231-connecting cylinder, 232-piston rod, 300-vertical slide. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0028] In the description of the embodiments of the present application, the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is conventionally placed when in use, or is the orientation or position relationship conventionally understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0029] In the description of the present application, unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", and "joined" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0030] Embodiment 1 Combined with Figure 1 , this embodiment provides a temporary support for a steel box girder of an existing urban road, including: a support frame body 100; a butt joint guiding frame 200 installed at the upper end of the support frame body 100, including two guiding members 210, and the two guiding members 210 are both inclined outward in the working state; wherein, when the steel box girder abuts against any one of the guiding members 210, it can slide downward relative to the guiding member 210 to guide the steel box girder to a set receiving position on the support frame body 100.

[0031] It can be understood that the support frame body 100 is usually built with steel pipe columns, the steel pipe column segments are connected by bolts, and the pipe columns are connected by angle steels, while the cross beam is selected from hot-rolled H-shaped steel or I-shaped steel.

[0032] To facilitate the adjustment of the elevation of the steel box girder after it is lapped on the support frame body 100, in this embodiment, a receiving platform 140 is arranged at the upper end of the support frame body 100, and a plurality of jacks 141 (generally hydraulic jacks 141) are arranged at intervals transversely on the receiving platform 140, and the plurality of jacks 141 are arranged at intervals along the length direction of the receiving platform 140, and are usually built with hot-rolled H-shaped steel or I-shaped steel. At the same time, the receiving platform 140 is located on one side of the length direction of the two guiding members 210 to ensure that the receiving platform 140 can receive the steel box girder guided by the guiding members 210, that is, after the steel box girder slides off the guiding members 210, it is lapped on the receiving platform 140. By controlling the telescopic movement of the jacks 141, the elevation of the steel box girder lapped on the support frame body 100 can be finely adjusted.

[0033] In this embodiment, a plurality of guiding rollers 211 are adapted to the guiding member 210; the plurality of guiding rollers 211 are arranged at intervals in sequence along the length direction of the corresponding guiding member 210, and each guiding roller 211 at least partially protrudes from the inner side surface of the guiding member 210, so that when the steel box girder abuts against the guiding roller 211, the rotation of the guiding roller 211 along its own axis drives the steel box girder to slide downward along the length direction of the guiding member 210, thereby reducing the resistance of the steel box girder to slide downward and ensuring that the guiding member 210 can provide a guiding effect on the steel box girder.

[0034] It should be understood that if the guide member 210 of the seam guide frame 200 is always above the support frame 100, then when the steel box girder is hoisted, the guide member 210 needs to be avoided when the steel box girder rises from the side wall of the support frame 100, and the hoisting path of the steel box girder is longer and higher than the hoisting path based on the existing steel box girder temporary support, affecting the hoisting efficiency of the steel box girder.

[0035] In this regard, the seam guide frame 200 provided in this embodiment is slidably connected to the support frame body 100; and also includes a lifting hydraulic cylinder 110, wherein the lifting hydraulic cylinder 110 is installed on the support frame body 100, and the moving end is transmission-connected to the seam guide frame 200; wherein, under the contraction of the lifting hydraulic cylinder 110, the seam guide frame 200 can be folded on one side of the support frame body 100, so that when the steel box is hoisted upward, the seam guide frame 200 is driven by the lifting hydraulic cylinder 110 to move downward and be folded on one side of the support frame body 100, thereby avoiding increasing the hanging height and the length of the hanging path of the steel box girder due to the provision of the seam guide frame 200, thereby ensuring that the hoisting equipment can quickly hoist the steel box girder to the top of the support frame body 100.

[0036] Combination Figure 2 This embodiment also includes a vertical slide 300, which is slidably installed on one side of the support frame 100 and is transmission-connected to the moving end of the lifting hydraulic cylinder 110; the middle part of the guide member 210 is hinged to the top corresponding to the vertical slide 300; the seam guide frame 200 also includes an open-arm hydraulic cylinder 220, and both ends of the open-arm hydraulic cylinder 220 are respectively hinged to the lower end of the corresponding guide member 210.

[0037] Therefore, the opening and closing of the guide members 210 are controlled by the extension and retraction of the arm hydraulic cylinder 220, so that when the seam guide frame 200 slides to the upper end of the support frame 100, the two guide members 210 are driven to tilt outward through the contraction of the arm hydraulic cylinder 220, so that the two guide members 210 are both tilted outward in the working state, and are connected into a whole through the arm hydraulic cylinder 220 and the vertical slide 300 to ensure that the guide members 210 have sufficient bearing capacity. Accordingly, the two guide members 210 are driven to reset through the extension of the arm hydraulic cylinder 220, so that when the lifting hydraulic cylinder 110 is contracted, the seam guide frame 200 is moved downward and overlapped on one side of the support frame 100.

[0038] Specifically, connecting grooves 120 are vertically installed on both sides of the support frame 100, and the side walls of the vertical slide 300 are installed in the corresponding connecting grooves 120 to achieve sliding connection between the vertical slide 300 and the support frame 100.

[0039] Correspondingly, a support cross beam 130 is provided in the middle of the support frame body 100. The support cross beam 130 is arranged horizontally, and the lifting hydraulic cylinder 110 is installed on the support cross beam 130, so as to facilitate the installation of the lifting hydraulic cylinder 110 and improve the structural strength of the support frame body 100 at the same time.

[0040] On this basis, the butt joint guiding frame 200 further includes a telescopic hydraulic rod 230. The oil storage cavity of the telescopic hydraulic rod 230 is connected with a hydraulic energy storage device through a stop valve; one end of the telescopic hydraulic rod 230 is hinged to the upper section of the corresponding guiding member 210, and the other end is hinged to the corresponding part at the upper end of the support frame body 100, so as to form a triangular support structure with the support frame body 100 and the guiding member 210 in the working state (the stop valve is in the closed state, so that the oil storage cavity of the telescopic hydraulic rod 230 is closed), further improving the load-bearing capacity of the butt joint guiding frame 200 and avoiding damage to the butt joint guiding frame 200 when the misalignment amount of the steel box girder is large.

[0041] Combined Figure 3 , the telescopic hydraulic rod 230 includes: a connecting cylinder body 231, with both ends closed, and one end is hinged to the support frame body 100; a piston rod 232, the piston section of which is inserted into the connecting cylinder body 231 and is adapted to the connecting cylinder body 231, and the other end is hinged to the corresponding guiding member 210; wherein, the inner cavity of the end of the connecting cylinder body 231 far away from the piston rod 232 is connected with the hydraulic energy storage device, so as to ensure that the telescopic hydraulic rod 230 can freely expand and contract along with the movement of the guiding member 210 (when the stop valve is opened and the telescopic hydraulic rod 230 extends, the hydraulic oil is supplemented into the liquid storage cavity of the telescopic hydraulic rod 230 through the hydraulic energy storage device, and when the telescopic hydraulic rod 230 is compressed short, the hydraulic oil extruded from the liquid storage cavity of the telescopic hydraulic rod 230 is stored through the hydraulic energy storage device), avoiding interference with the expansion and contraction of the split arm hydraulic cylinder 220.

[0042] In summary, the temporary support for the steel box girder of the existing urban road provided in this embodiment includes a support frame body 100 and a butt joint guiding frame 200. The butt joint guiding frame 200 is installed at the upper end of the support frame body 100. At the same time, the butt joint guiding frame 200 includes two guiding members 210, and the guiding members 210 are both inclined outwards in the working state. When hoisting the steel box girder, the steel box girder is hoisted to the upper end of the support frame body 100 through a hoisting device, so that the corresponding end of the steel box girder is directly opposite to the upper part of the guiding groove formed by the two guiding members 210, and then the steel box girder is lowered, so that the steel box girder is directly placed at the set receiving position at the upper end of the support frame body 100, or abuts against any one of the guiding members 210 and slides down relative to the guiding member 210, so as to guide the steel box girder to the set receiving position on the support frame body 100 through the guiding action of the guiding member 210.

[0043] In summary, the temporary support for the steel box girder of the existing urban road provided in this embodiment can provide seam alignment guidance for the steel box girder, so that there is no seam misalignment gap after the steel box girder is lapped on the temporary support. Only the elevation and weld width need to be adjusted, and the seam misalignment adjustment is not required, thus greatly improving the docking efficiency of the steel box girder and reducing the impact on the existing urban road traffic.

[0044] Embodiment 2 Combined with Figure 4 , this embodiment provides a method for installing a steel box girder of an existing urban road. Based on the temporary support for the steel box girder of the existing urban road described in Embodiment 1, it includes the following steps: S10. Erect the temporary support for the steel box girder of the existing urban road at the corresponding position of the steel box girder connection section, and make the seam alignment guide frame 200 in a standby state.

[0045] Specifically, when building the temporary support, it is necessary to pre-harden the ground and lay drainage ditches, etc., and build temporary piers at the corresponding positions, and then build the temporary support for the steel box girder of the existing urban road described in Embodiment 1 on the temporary piers.

[0046] After the temporary support is built, open the cut-off valve to ensure that the telescopic hydraulic rod 230 can automatically extend and retract, then control the opening arm hydraulic cylinder 220 to extend, so that the two guiding members 210 incline inward or remain vertical, and then control the lifting hydraulic cylinder 110 to contract to store the seam alignment guide frame 200 on one side of the support frame body 100. Generally, when the seam alignment guide frame 200 is in the stored state, the upper end of the guiding member 210 should be lower than or slightly higher than the upper end of the jack 141.

[0047] S20. Lift the corresponding end of the steel box girder above the support frame body 100, and then make the seam alignment guide frame 200 in a working state.

[0048] Specifically, during the process of lifting the steel box girder above the jack 141, the seam alignment guide frame 200 is in the stored state. Before lowering the steel box girder, control the seam alignment guide frame 200 to unfold, that is, drive the vertical sliding frame 300 to move upward through the lifting hydraulic cylinder 110, and drive the guiding member 210 to incline outward through the contraction of the opening arm hydraulic cylinder 220. While the lifting hydraulic cylinder 110 and the opening arm hydraulic cylinder 220 are operating, the telescopic hydraulic rod 230 automatically extends and retracts. When the height and inclination angle of the guiding member 210 are adjusted to the preset state, close the cut-off valve so that the telescopic hydraulic rod 230 cannot extend and retract. At this time, the telescopic hydraulic rod 230, the support frame body 100 and the guiding member 210 form a stable triangular support structure. And the triangular support structures on both sides are connected into a whole through the vertical sliding frame 300 and the opening arm hydraulic cylinder 220.

[0049] S30. Lower the steel box girder so that the corresponding end of the steel box girder is lapped on the upper end of the support frame 100 after being guided by the butt joint guiding frame 200.

[0050] During the process of lowering the steel box girder, if there is no misalignment of the steel box girder, it is directly placed at the set receiving position on the upper end of the support frame 100. If there is misalignment of the steel box girder, it abuts against the guiding member 210 on the deviation side and slides downward relative to the guiding member 210. Thus, through the guiding action of the guiding member 210, the steel box girder is guided to the set receiving position on the support frame 100.

[0051] S40. Adjust the weld width and elevation of the end of the steel box girder.

[0052] Specifically, during butt joint, use a crane to slowly move up, down, left and right to adjust the elevation and weld width of the beam body so that its elevation and weld width basically meet the target values given by the design. Then, conduct elevation measurement and calculate the difference from the design. Then, use the jack 141 installed with a temporary support to finely adjust the elevation of the beam body so that it meets the design requirement elevation.

[0053] S50. After the weld width and elevation of the steel box girder meet the design requirements, weld adjacent steel box girders.

[0054] After welding is completed, detect the weld. After passing the detection, pour and weigh the concrete on the steel box girder. Finally, remove the temporary support to complete the installation of the steel box girder (when storing the butt joint guiding frame 200 after hoisting is completed, first drive the vertical sliding frame 300 to move downward by the lifting hydraulic cylinder 110, and then extend the arm-opening hydraulic cylinder 220 so that the guiding member 210 moves downward to the outside of one side of the support frame 100 in an inclined state).

[0055] That is to say, for the method for installing the steel box girder of the existing urban road provided in this embodiment, first erect the above-mentioned temporary support for the steel box girder of the existing urban road at the corresponding position of the steel box girder connection section and make the butt joint guiding frame 200 in a standby state. Then, hoist the corresponding end of the steel box girder above the support frame 100. Next, make the butt joint guiding frame 200 in a working state and lower the steel box girder so that the corresponding end of the steel box girder is lapped on the upper end of the support frame 100 after being guided by the butt joint guiding frame 200 to guide the steel box girder to the set receiving position on the support frame 100. Finally, adjust the weld width and elevation of the end of the steel box girder, and after the weld width and elevation of the steel box girder meet the design requirements, weld adjacent steel box girders.

[0056] In summary, in the installation process of this embodiment, only the elevation and weld width need to be adjusted, and no misalignment adjustment is required, thus greatly improving the docking efficiency of the steel box girder and reducing the impact on the existing urban road traffic.

[0057] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temporary support for steel box beams on existing urban roads, characterized in that: include: A support frame (100); A seam guide frame (200) is installed on the upper end of the support frame body (100), and comprises two guide components (210). The two guide components (210) are both inclined outwards in a working state; When the steel box girder contacts any of the guide members (210), it can slide downward relative to the guide member (210) to guide the steel box girder to a receiving position set on the support frame (100).

2. The temporary support for steel box beams of existing urban roads according to claim 1 is characterized in that: The guide member (210) is adapted to be equipped with a plurality of guide rollers (211); The plurality of guide rollers (211) are sequentially arranged at intervals along the length direction of the corresponding guide member (210), and each guide roller (211) at least partially protrudes from the inner side surface of the guide member (210).

3. The temporary support for steel box beams of existing urban roads according to claim 1 is characterized in that: The seam-aligning guide frame (200) is slidably connected to the support frame body (100); It also includes a lifting hydraulic cylinder (110), wherein the lifting hydraulic cylinder (110) is installed on the support frame (100), and a movable end thereof is transmission-connected to the seam-aligning guide frame (200); Wherein, when the lifting hydraulic cylinder (110) is retracted, the seam guide frame (200) can be folded onto one side of the support frame body (100).

4. The temporary support for steel box beams of existing urban roads according to claim 3 is characterized in that: It also includes a vertical slide (300), which is slidably mounted on one side of the support frame (100) and is transmission-connected to the moving end of the lifting hydraulic cylinder (110); The middle portion of the guide member (210) is hinged to the corresponding top portion of the vertical slide frame (300); The seam-aligning guide frame (200) further comprises an arm-opening hydraulic cylinder (220), and both ends of the arm-opening hydraulic cylinder (220) are respectively hinged to the lower ends of the corresponding guide members (210).

5. The temporary support for steel box beams of existing urban roads according to claim 4 is characterized in that: Both sides of the support frame (100) are vertically mounted with connecting slide grooves (120), and the side walls of the vertical slide frame (300) are mounted in the corresponding connecting slide grooves (120).

6. The temporary support for steel box beams of existing urban roads according to claim 4 is characterized in that: A supporting cross arm (130) is arranged in the middle of the supporting frame (100), the supporting cross arm (130) is arranged transversely, and the lifting hydraulic cylinder (110) is installed on the supporting cross arm (130).

7. The temporary support for steel box beams of existing urban roads according to claim 1 is characterized in that: The seam-aligning guide frame (200) further comprises a telescopic hydraulic rod (230), and an oil storage chamber of the telescopic hydraulic rod (230) is connected to a hydraulic accumulator via a stop valve; One end of the telescopic hydraulic rod (230) is hinged to the corresponding upper section of the guide member (210), and the other end is hinged to the corresponding portion of the upper end of the support frame (100), so as to form a triangular support structure with the support frame (100) and the guide member (210) in a working state.

8. The temporary support for steel box beams of existing urban roads according to claim 7 is characterized in that: The telescopic hydraulic rod (230) comprises: A connecting cylinder (231) with closed ends and one end hinged to the supporting frame (100); A piston rod (232), the piston section of which is inserted into the connecting cylinder (231) and adapted to the connecting cylinder (231), and the other end of which is hinged to the corresponding guide member (210); Wherein, the inner cavity of one end of the connecting cylinder (231) away from the piston rod (232) is connected to the hydraulic accumulator.

9. The temporary support for steel box beams of existing urban roads according to any one of claims 1 to 8, characterized in that: A receiving platform (140) is arranged at the upper end of the support frame (100), and a plurality of jacks (141) are arranged on the receiving platform (140) at intervals in the horizontal direction. The receiving platform (140) is located on one side of the length direction of the two guide components (210).

10. A method for installing steel box beams on existing urban roads, characterized in that: The temporary support for steel box beams of existing urban roads according to any one of claims 1 to 9 comprises the following steps: S10, erecting the temporary support for the existing urban road steel box girder at the position corresponding to the steel box girder connection section, and placing the seam guide frame (200) in a standby state; S20, hoisting the corresponding end of the steel box beam to the top of the support frame (100), and then putting the seam guide frame (200) into working state; S30, lowering the steel box girder so that the corresponding end of the steel box girder is guided by the seam guide frame (200) and then overlapped on the upper end of the support frame body (100); S40, adjusting the weld width and elevation of the end of the steel box girder; S50. After the weld width and elevation of the steel box girder meet the design requirements, weld the adjacent steel box girders.

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