A lifting device and method for dismantling an old bridge

Abstract

The present invention discloses a lifting device and method for dismantling an old bridge, belonging to the technical field of bridge construction, comprising a base frame, the base frame comprising two symmetrically distributed base plates, a plurality of stabilizing structures distributed in a linear array being provided between the two base plates, two symmetrically distributed baffles being provided on opposite sides of the two base plates, a clamping block being fixedly installed on each of the two baffles on the same side close to one side of the base plate on the same side, a clamping slot matching the clamping block on the same side being provided on the opposite sides of the two base plates, a movable slot being provided on the inner wall of the clamping slot, a positioning assembly being provided in each of the movable slots, and the two baffles on the same side being fixed to the base plate on the same side by a first bolt. The present invention, through the provision of the base frame and the stabilizing structure, plays a role in supporting and stabilizing the bottom of the old bridge, and through the cooperation of the baffles, the top plate and the connecting plate, it is beneficial to maintain the stability of the old bridge when it is lifted, and to reduce the possibility of the old bridge breaking.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and more particularly to a lifting device and method for dismantling an old bridge. Background Art

[0002] A bridge generally refers to a structure built across rivers, lakes, or seas to facilitate the passage of vehicles and pedestrians. To adapt to the rapid development of modern transportation, the term "bridge" has also been extended to encompass structures built to facilitate travel across mountain streams, over unfavorable geological conditions, or to meet other transportation needs. Some bridges are constructed of reinforced concrete, and over time, they may need to be dismantled and rebuilt.

[0003] Some existing bridge dismantling methods involve cutting the main structure of the bridge, then using an existing crane with two steel cables looped around the ends of the bridge to lift it and place it in a safe location. However, when an old bridge is severely deteriorating due to age or overload, the bottom of the lifted bridge lacks a stable structure, and the bridge may break in the middle and fall during lifting, resulting in low safety. Therefore, to address this issue, we have proposed a lifting device and method for dismantling old bridges. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a bridge demolition and lifting device and method, which adopts the following technical solutions:

[0005] A lifting device for dismantling an old bridge comprises a base frame, wherein the base frame comprises two symmetrically distributed base plates, a plurality of stable structures distributed in a linear array are provided between the two base plates, two symmetrically distributed baffles are provided on opposite sides of the two base plates, a clamping block is fixedly installed on one side of the two baffles on the same side close to the base plates on the same side, a clamping groove matching the clamping block on the same side is provided on the opposite sides of the two base plates, a movable groove is provided on the inner wall of the clamping groove, a positioning assembly is provided in each movable groove, and the two baffles on the same side are fixed to the base plates on the same side by a first bolt;

[0006] The baffles are each provided with a through groove on their surfaces, and a top plate is provided above the two bottom plates. Two symmetrically distributed support plates are fixedly installed on the top of the top plates. The baffles and the support plates on the same side are screwed together by third bolts and nuts. A connecting plate is provided between the two baffles in the longitudinal direction, and the two ends of the connecting plate are fixed to the baffles on the same side by second bolts.

[0007] A sling structure is provided between the two connecting plates, and the sling structure includes a main steel cable, and two symmetrically distributed auxiliary steel cables are provided at the bottom end of the main steel cable, and a second hook is provided at the bottom end of the two auxiliary steel cables, and a first lifting ear is provided at the top end of the two connecting plates to match the second hook on the same side.

[0008] By adopting the above technical solution, when the equipment is used, the staff will place the two bottom plates at the bottom of the old bridge, and then pass the existing fixing bolts through the bottom plates and extend them into the old bridge, which can fix the bottom plates. When the two bottom plates are installed, the staff will place a stable structure between the two bottom plates. By setting up multiple groups of stable structures, it can support and stabilize the old bridge, which is conducive to maintaining the stability of the old bridge lifting. Then, the baffle is placed on the outside of the bottom plate, so that the block installed on the side wall of the lower section of the baffle is engaged with the slot opened on the side wall of the bottom plate, which can play the role of preliminarily fixing the baffle, and a positioning component is provided in the slot to play the role of positioning and fixing the block, and then play the role of positioning the baffle, and then the first bolt is passed through the baffle and the bottom plate. The plate can play the role of fixing the baffle. When the baffle is fixed, the staff will place the top plate on the top of the old bridge, and then use the third bolt, nut and the support plate installed on the top of the top plate to assemble the baffle and the top plate. The surface of the baffle is provided with a through groove, which is convenient for assembling old bridges of different thicknesses. Then the connecting plate is placed between the two longitudinal baffles and fixed with a second bolt. Then, the second hooks installed at the ends of the two auxiliary steel cables in the sling structure are hooked with the first lifting ear installed on the top of the connecting plate. The cooperation of the baffle rod and the third spring in the second hook is conducive to maintaining the stability of the connection between the second hook and the first lifting ear on the same side. Then the main steel cable is connected to the existing crane, and then the old bridge can be lifted by the crane.

[0009] Furthermore, the stable structure includes a support rod arranged between the two bottom plates, and both ends of the support rod are provided with storage grooves, and moving rods are slidably installed in the storage grooves, and support blocks are fixedly installed on the opposite ends of the two moving rods in the same group, and support grooves matching the support blocks on the same side are provided on the opposite sides of the two bottom plates. A second spring is fixedly connected between the opposite sides of the two moving rods in the same group and the inner walls of the opposite sides of the storage grooves in the same group, and handles are fixedly installed on the bottoms of the opposite ends of the two moving rods in the same group, and the bottom ends of the handles slide through the storage grooves in the same group. A plurality of support blocks distributed in a linear array are provided at the bottom ends of the two bottom plates, and the top ends of the support blocks on the same side are in contact with the bottom ends of the corresponding moving rods on the same side.

[0010] By adopting the above technical solution, when the base plate is installed, the movable rod on the same side is pulled by the handle to slide into the storage groove of the same group, and then the support rod and the movable rod of the same group are placed between the two base plates, so that the support block provided at the opposite end of the movable rod is engaged with the support groove opened on the inner side of the base plate. Through the cooperation of the movable rod and the second spring, the distance between the two movable rods of the same group can be adjusted, which is convenient for supporting old bridges of different widths. Through the cooperation of the support rod and the movable rod, the bottom of the old bridge can be supported and stabilized, which is conducive to maintaining the stability of the old bridge when it is lifted.

[0011] Furthermore, sliders are fixedly installed on both sides of the opposite ends of the two moving rods in the same group, and the inner wall of the storage groove is provided with a sliding groove matching the sliders on the same side.

[0012] By adopting the above technical solution, when the moving rod slides in the same group of storage grooves, the moving rod slides with the same group of sliders in the same side slide grooves. The cooperation between the sliders and the slide grooves is conducive to maintaining the sliding stability of the moving rod and helps to prevent the moving rod from escaping from the same group of storage grooves.

[0013] Furthermore, the positioning assembly includes a positioning rod slidably installed in the movable groove, and a first spring is fixedly connected between the inner wall of the side of the positioning rod away from the same side of the blocking block and the side opposite to the movable groove of the same group, and the side wall of the blocking block is provided with a positioning groove matching the opposite end of the positioning rod of the same group.

[0014] By adopting the above technical solution, when the card block slides into the card slot of the same group, the card block pushes the positioning rod of the same group to slide into the movable groove of the same group, and the positioning rod pushes the first spring of the same group to contract. When the card block slides in the card slot of the same group, the positioning rod returns to its original position under the elastic force of the first spring of the same group, and the positioning rod is engaged with the positioning groove of the side wall of the card block of the same group, which can play the role of positioning and fixing the card block, and then play the role of positioning and fixing the baffle.

[0015] Furthermore, two symmetrically distributed limit blocks are fixedly installed on the side wall of the positioning rod close to one end of the first spring on the same side, and the inner wall of the movable groove is provided with a limit groove matching the two limit blocks in the same group.

[0016] By adopting the above technical solution, when the positioning rod slides in the same group of movable grooves, the positioning rod slides in the same side limit groove with the same group of limit blocks. The cooperation between the limit blocks and the limit grooves is conducive to maintaining the sliding stability of the positioning rod and helps to prevent the positioning rod from leaving the same group of movable grooves.

[0017] Furthermore, two symmetrically distributed positioning blocks are fixedly mounted on both ends of the two connecting plates, and grooves matching the positioning blocks are formed on the top ends of the baffles.

[0018] By adopting the above technical solution, when installing the connecting plate, the staff places the connecting plate between the two longitudinal baffles, and then engages the positioning blocks installed on both sides of the connecting plate with the grooves opened at the top of the baffle, which can play the role of positioning the connecting plate and facilitate subsequent fixing by the second bolt.

[0019] Furthermore, the inner side walls of the second hooks are hinged with a barrier rod, and a third spring is fixedly connected between the side walls of the barrier rod and the inner walls of the second hooks in the same group.

[0020] By adopting the above technical solution, the cooperation of the blocking rod and the third spring in the second hook can prevent the second hook from being separated from the first hanging ear in the same group, which is beneficial to maintaining the stability of the connection between the second hook and the first hanging ear on the same side.

[0021] Furthermore, the two side walls of the auxiliary steel cables are each provided with a sleeve, and the two side walls of the sleeve are provided with two second lifting ears that are rotationally symmetrically distributed. The top ends of the two top plates are each fixedly installed with two symmetrically distributed pulling steel cables, and the top ends of the pulling steel cables are each provided with a first hook, and the first hook is hooked with the second lifting ear on the same side.

[0022] By adopting the above technical solution, after the second hook is hooked with the first lifting lug of the same group, the staff pulls the pulling cable through the first hook, and then the first hook is hooked with the second lifting lug installed on the side wall of the corresponding secondary steel cable, which plays a role of pulling and stabilizing, and is conducive to maintaining the stability of the lifting of the old bridge.

[0023] Furthermore, a plurality of limit plates distributed in a linear array are provided on opposite sides of the two base plates, and plug blocks are fixedly installed on the bottom of the limit plates close to the base plates on the same side. Slots matching the plug blocks on the same side are provided on opposite sides of the two base plates, and rubber rods are fixedly installed on the sides of the slots away from the limit plates on the same side, and rubber grooves matching the rubber rods in the same group are provided on the sides of the plug blocks away from the limit plates in the same group.

[0024] By adopting the above technical solution, when the two base plates are installed, the staff will engage the plug installed on the side wall of the limit plate with the slot opened on the outside of the base plate, and a rubber rod is provided in the slot. When the plug and the corresponding slot are engaged, the rubber rod installed in the slot engages with the rubber groove opened on the side wall of the plug, which can play a role in positioning and stabilizing the limit plate. Through the setting of the limit plate, the old bridge can be stabilized, which is conducive to maintaining the stability of the lifting of the old bridge.

[0025] A method for dismantling and lifting an old bridge comprises the following steps:

[0026] S1. Bottom plate assembly: Place the two bottom plates at the bottom of the old bridge, then pass the existing fixing bolts through the bottom plates and extend into the old bridge to fix the bottom plates. Then, place the baffle plate on the outside of the bottom plate, so that the block installed on the side wall of the lower section of the baffle plate engages with the slot opened on the side wall of the bottom plate, which can initially fix the baffle plate. A positioning assembly is provided in the slot to position and fix the block, and then position the baffle plate. Then, pass the first bolt through the baffle plate and the bottom plate to fix the baffle plate. When the baffle plate is fixed, the staff places the top plate on the top of the old bridge, and then cooperates with the support plate installed on the top of the top plate through the third bolt, nut, and the top plate to assemble the baffle plate. The through groove on the surface of the baffle plate is convenient for assembling old bridges of different thicknesses. Then, place the connecting plate between the two longitudinal baffle plates and fix it with the second bolt.

[0027] S2. Installation of a stable structure: After the installation of the base plate is completed, the movable rod on the same side is pulled by the handle to slide into the storage groove of the same group, and then the support rod and the movable rod of the same group are placed between the two base plates, so that the support blocks provided at the opposite ends of the movable rods are engaged with the support grooves provided on the inner sides of the base plates. The cooperation between the movable rod and the second spring can adjust the distance between the two movable rods of the same group, so as to facilitate the support of old bridges of different widths. The cooperation between the support rod and the movable rod can support and stabilize the bottom of the old bridge, which is conducive to maintaining the stability of the old bridge when it is hoisted.

[0028] S3. Lifting the old bridge: After the installation of the base plate, stabilizing structure, baffle and connecting plate is completed, the second hooks installed at the ends of the two auxiliary steel cables in the sling structure are hooked with the first lifting lug installed at the top of the connecting plate. The cooperation of the baffle rod and the third spring in the second hook is conducive to maintaining the stability of the connection between the second hook and the first lifting lug on the same side. Then the main steel cable is connected to the existing crane, and then the old bridge can be lifted by the crane.

[0029] In summary, the present invention has the following beneficial technical effects:

[0030] (1) In the present invention, the bottom of the old bridge is supported and stabilized by the arrangement of the base frame and the stabilizing structure, and the coordination of the baffle, the top plate and the connecting plate helps to maintain the stability of the old bridge when it is lifted, thereby reducing the possibility of the old bridge breaking.

[0031] (2) In the present invention, by setting up the sling structure and cooperating with the main steel cable and the auxiliary steel cable, it is convenient for the existing crane to lift the old bridge, and a pulling steel cable is provided between the top plate and the auxiliary steel cable, which is beneficial to maintaining the stability of the lifting of the old bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0034] Figure 3 For the present invention Figure 1 Enlarged view of point B in the middle;

[0035] Figure 4 For the present invention Figure 1 Enlarged view of point C in the middle;

[0036] Figure 5 For the present invention Figure 1 Enlarged view of point D in the middle;

[0037] Figure 6 A bottom view of the present invention;

[0038] Figure 7 A top cross-sectional view of the bottom plate and support rods of the present invention;

[0039] Figure 8 For the present invention Figure 7 Enlarged view of point E in the middle;

[0040] Figure 9 For the present invention Figure 7 Enlarged view of point F in the middle;

[0041] Figure 10 This is a diagram showing the stable structure of the present invention.

[0042] Description of the numbers in the figure:

[0043] 1. Base frame; 11. Bottom plate; 111. Support block; 112. Slot; 113. Support slot; 114. Card slot; 1141. Movable slot; 1142. First spring; 1143. Positioning rod; 1121. Rubber rod; 12. Stable structure; 121. Support rod; 1211. Storage slot; 1212. Second spring; 122. Moving rod; 1221. Support block; 2. Baffle; 21. First bolt; 22. Through slot; 23. First Two bolts; 24. Groove; 25. Block; 3. Limiting plate; 31. Insert block; 4. Top plate; 42. Support plate; 41. Pulling cable; 411. First hook; 5. Third bolt; 51. Nut; 6. Connecting plate; 61. First lifting ear; 62. Positioning block; 7. Lifting cable structure; 71. Main cable; 72. Auxiliary cable; 721. Sleeve; 722. Second lifting ear; 73. Second hook; 731. Stop rod; 732. Third spring. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0047] The following is combined with Figure 1-10 The present invention is described in further detail.

[0048] See also Figure 1-10The lifting device for dismantling an old bridge comprises a base frame 1, the base frame 1 comprises two symmetrically distributed base plates 11, and a plurality of stable structures 12 distributed in a linear array are arranged between the two base plates 11. The stable structure 12 comprises a support rod 121 arranged between the two base plates 11, and a receiving groove 1211 is provided at both ends of the support rod 121, and a moving rod 122 is slidably installed in the receiving groove 1211. The opposite ends of the two moving rods 122 of the same group are fixedly installed with a support block 1221. The opposite sides of the two base plates 11 are provided with a support groove 113 matching the support block 1221 on the same side, and a second spring 1212 is fixedly connected between the opposite side of the two moving rods 122 of the same group and the inner wall of the side opposite to the receiving groove 1211 of the same group. The bottom of the opposite end of the two moving rods 122 of the same group is fixedly installed with a handle, and the bottom end of the handle slides through the receiving groove 1211 of the same group, and the bottom ends of the two base plates 11 are provided with a plurality of support blocks distributed in a linear array. 111, the top of the support block 111 on the same side contacts the bottom end of the corresponding moving rod 122 on the same side. When the equipment is used, the staff places the two bottom plates 11 on the bottom of the old bridge, and then passes through the bottom plate 11 and extends into the old bridge through the existing fixing bolts, which can fix the bottom plate 11. When the two bottom plates 11 are installed, the moving rod 122 on the same side is pulled by the handle to slide into the same group of storage grooves 1211, and then the support rod 121 and the moving rod 122 of the same group are placed between the two bottom plates 11, so that the support block 1221 provided at the opposite end of the moving rod 122 is engaged with the support groove 113 opened on the inner side of the bottom plate 11. Through the cooperation of the moving rod 122 and the second spring 1212, the distance between the two moving rods 122 of the same group can be adjusted, which is convenient for supporting old bridges of different widths. Through the cooperation of the support rod 121 and the moving rod 122, the bottom of the old bridge can be supported and stabilized, which is conducive to maintaining the stability of the old bridge hoisting.

[0049] Sliders are fixedly installed on both sides of the opposite ends of the two moving rods 122 in the same group, and a sliding groove matching the slider on the same side is opened on the inner wall of the storage groove 1211. When the moving rod 122 slides in the storage groove 1211 of the same group, the moving rod 122 slides in the sliding groove on the same side with the slider of the same group. The cooperation between the slider and the sliding groove is conducive to maintaining the sliding stability of the moving rod 122 and helps to prevent the moving rod 122 from escaping from the storage groove 1211 of the same group.

[0050] Two symmetrically distributed baffles 2 are provided on opposite sides of the two base plates 11, and a clamping block 25 is fixedly installed on the side of the two baffles 2 on the same side close to the side of the base plate 11 on the same side. A clamping groove 114 matching the clamping block 25 on the same side is provided on the opposite sides of the two base plates 11, and a movable groove 1141 is provided on the inner wall of the clamping groove 114. A positioning assembly is provided in the movable groove 1141, and the two baffles 2 on the same side are fixed to the base plate 11 on the same side by a first bolt 21. The positioning assembly includes a positioning rod 1143 slidably installed in the movable groove 1141, and a first spring 1142 is fixedly connected between the side of the positioning rod 1143 away from the side of the clamping block 25 and the inner wall of the side opposite to the movable groove 1141 of the same group. The side wall of the clamping block 25 is provided with a positioning groove matching the opposite end of the positioning rod 1143 of the same group.

[0051] The staff places the baffle 2 on the outside of the base plate 11, so that the block 25 installed on the side wall of the lower section of the baffle 2 is engaged with the slot 114 opened on the side wall of the base plate 11, which can play the role of preliminarily fixing the baffle 2. When the block 25 slides into the same group of slots 114, the block 25 pushes the same group of positioning rods 1143 to slide into the same group of movable slots 1141, and the positioning rods 1143 push the same group of first springs 1142 to contract. When the block 25 slides in the same group of slots 114, the positioning rod 1143 returns to its original position under the elastic force of the same group of first springs 1142, and the positioning rod 1143 is engaged with the positioning slot of the side wall of the block 25 of the same group, which can play the role of positioning and fixing the block 25, and then play the role of positioning and fixing the baffle 2.

[0052] Two symmetrically distributed limit blocks are fixedly installed on the side wall of the positioning rod 1143 near one end of the first spring 1142 on the same side, and a limit groove matching the two limit blocks in the same group is opened on the inner wall of the movable groove 1141. When the positioning rod 1143 slides in the movable groove 1141 of the same group, the positioning rod 1143 slides in the limit groove on the same side with the limit blocks of the same group. The cooperation between the limit blocks and the limit grooves is conducive to maintaining the sliding stability of the positioning rod 1143 and helps to prevent the positioning rod 1143 from leaving the movable groove 1141 of the same group.

[0053] The surface of the baffle 2 is provided with a through groove 22, and a top plate 4 is provided above the two bottom plates 11. Two symmetrically distributed support plates 42 are fixedly installed on the top of the top plate 4. The baffle 2 and the support plate 42 on the same side are screwed together by a third bolt 5 and a nut 51. A connecting plate 6 is provided between the two longitudinal baffles 2. The two ends of the connecting plate 6 and the baffle 2 on the same side are fixed by a second bolt 23. Two symmetrically distributed positioning blocks 62 are fixedly installed on both ends of the two connecting plates 6. A groove 24 matching the positioning block 62 is provided on the top of the baffle 2. When the baffle 2 After the fixation is completed, the staff places the top plate 4 on the top of the old bridge, and then cooperates with the third bolt 5, nut 51 and the support plate 42 installed on the top of the top plate 4 to assemble the baffle 2 and the top plate 4. The surface of the baffle 2 is provided with a through groove 22, which is convenient for assembling old bridges of different thicknesses. Then, the connecting plate 6 is placed between the two longitudinal baffles 2. Then, the positioning blocks 62 installed on both sides of the connecting plate 6 are engaged with the grooves 24 opened on the top of the baffle 2, which can play the role of positioning the connecting plate 6, so as to facilitate subsequent fixation by the second bolt 23.

[0054] The two bottom plates 11 are provided with a plurality of limit plates 3 distributed in a linear array on the opposite side of each other. The limit plates 3 are fixedly installed with plug blocks 31 on the bottom of the side close to the bottom plate 11 on the same side. The two bottom plates 11 are provided with slots 112 that match the plug blocks 31 on the same side on the opposite side on the opposite side. The slots 112 are fixedly installed with rubber rods 1121 on the side away from the limit plates 3 on the same side. The plug blocks 31 are provided with rubber grooves that match the rubber rods 1121 on the side away from the limit plates 3 on the same group. When the two bottom plates 11 are installed, After completion, the staff will engage the plug block 31 installed on the side wall of the limit plate 3 with the slot 112 opened on the outside of the bottom plate 11, and a rubber rod 1121 is provided in the slot 112. When the plug block 31 and the corresponding slot 112 are engaged, the rubber rod 1121 installed in the slot 112 is engaged with the rubber groove opened on the side wall of the plug block 31, which can play a role in positioning and stabilizing the limit plate 3. Through the setting of the limit plate 3, the old bridge can be stabilized, which is conducive to maintaining the stability of the lifting of the old bridge.

[0055] A sling structure 7 is provided between the two connecting plates 6. The sling structure 7 includes a main steel cable 71. Two symmetrically distributed auxiliary steel cables 72 are provided at the bottom end of the main steel cable 71. The bottom ends of the two auxiliary steel cables 72 are provided with second hooks 73. The tops of the two connecting plates 6 are provided with first lifting ears 61 that match the second hooks 73 on the same side. The inner walls of the second hooks 73 are hinged with a baffle 731, and a third spring 732 is fixedly connected between the side walls of the baffle 731 and the inner walls of the second hooks 73 of the same group.

[0056] The side walls of the two auxiliary steel cables 72 are both sleeved with a sleeve 721, and the side walls of the two sleeves 721 are provided with two second lifting ears 722 that are rotationally symmetrically distributed. The top of the two top plates 4 are fixedly installed with two symmetrically distributed pulling steel cables 41, and the top of the pulling steel cables 41 are both provided with a first hook 411, which is hooked with the second lifting ear 722 on the same side.

[0057] The second hooks 73 installed at the ends of the two auxiliary steel cables 72 in the staff's lifting cable structure 7 are hooked with the first lifting ear 61 installed at the top of the connecting plate 6. The cooperation of the blocking rod 731 and the third spring 732 in the second hook 73 is conducive to maintaining the stability of the connection between the second hook 73 and the first lifting ear 61 on the same side. When the second hook 73 is hooked with the first lifting ear 61 of the same group, the staff pulls the pulling steel cable 41 through the first hook 411, and then the first hook 411 is hooked with the second lifting ear 722 installed on the side wall of the corresponding auxiliary steel cable 72, which plays a role of pulling and stabilizing, and is conducive to maintaining the stability of the lifting of the old bridge. Subsequently, the main steel cable 71 is connected to the existing crane, and then the old bridge can be lifted by the crane.

[0058] A method for dismantling and lifting an old bridge comprises the following steps:

[0059] After the first bolt 21 is passed through the baffle plate 2 and the bottom plate 11, the baffle plate 2 and the top plate 4 are fixed together.

[0060] S2. Installation of the stable structure 12: After the installation of the base plate 11 is completed, the movable rod 122 on the same side is pulled by the handle to slide into the receiving groove 1211 of the same group, and then the support rod 121 and the movable rod 122 of the same group are placed between the two base plates 11, so that the support block 1221 provided at the opposite end of the movable rod 122 is engaged with the support groove 113 opened on the inner side of the base plate 11. Through the cooperation of the movable rod 122 and the second spring 1212, the distance between the two movable rods 122 of the same group can be adjusted, which is convenient for supporting old bridges of different widths. Through the cooperation of the support rod 121 and the movable rod 122, the bottom of the old bridge can be supported and stabilized, which is conducive to maintaining the stability of the old bridge when it is hoisted.

[0061] S3. Lifting the old bridge: After the installation of the base plate 11, the stabilizing structure 12, the baffle 2 and the connecting plate 6 is completed, the second hooks 73 installed at the ends of the two auxiliary steel cables 72 in the sling structure 7 are hooked with the first lifting ear 61 installed at the top of the connecting plate 6. The cooperation of the blocking rod 731 and the third spring 732 in the second hook 73 is conducive to maintaining the stability of the connection between the second hook 73 and the first lifting ear 61 on the same side. Then the main steel cable 71 is connected to the existing crane, and then the old bridge can be lifted by the crane.

[0062] The implementation principle of the embodiment of the present invention is as follows: when the device is used, the staff places the two bottom plates 11 on the bottom of the old bridge, and then passes through the bottom plates 11 through the existing fixing bolts and extends into the old bridge, which can fix the bottom plates 11. When the two bottom plates 11 are installed, the staff places the stabilizing structure 12 between the two bottom plates 11. Through the arrangement of multiple groups of stabilizing structures 12, it plays a role in supporting and stabilizing the old bridge, which is conducive to maintaining the stability of the old bridge lifting. Subsequently, the baffle 2 is placed on the outside of the bottom plate 11, so that the block 25 installed on the side wall of the lower section of the baffle 2 is engaged with the slot 114 opened on the side wall of the bottom plate 11, which can play a role in preliminarily fixing the baffle 2, and a positioning component is provided in the slot 114, which plays a role in positioning and fixing the block 25, and then plays a role in positioning the baffle 2. Subsequently, the first bolt 21 is passed through the baffle 2 and the bottom plate 11, which can fix the baffle. The function of plate 2 is that when the baffle plate 2 is fixed, the staff places the top plate 4 on the top of the old bridge, and then cooperates with the support plate 42 installed on the top of the top plate 4 through the third bolt 5, nut 51 and the support plate 42 installed on the top of the top plate 4, which can play the role of assembling the baffle plate 2 and the top plate 4. The surface of the baffle plate 2 is provided with a through groove 22, which is convenient for assembling old bridges of different thicknesses. Then the connecting plate 6 is placed between the two longitudinal baffle plates 2 and fixed by the second bolt 23. Then, the second hooks 73 installed at the ends of the two auxiliary steel cables 72 in the sling structure 7 are hooked with the first lifting ear 61 installed on the top of the connecting plate 6. The cooperation of the baffle rod 731 and the third spring 732 in the second hook 73 is conducive to maintaining the stability of the connection between the second hook 73 and the first lifting ear 61 on the same side. Then, the main steel cable 71 is connected to the existing crane, and then the old bridge can be lifted by the crane. The structure in the equipment is set to a size according to actual conditions.

[0063] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lifting device for dismantling an old bridge, comprising a base frame (1), characterized in that: The chassis (1) comprises two symmetrically distributed bottom plates (11), a plurality of stable structures (12) distributed in a linear array are provided between the two bottom plates (11), two symmetrically distributed baffles (2) are provided on opposite sides of the two bottom plates (11), a clamping block (25) is fixedly installed on the side of the two baffles (2) close to the bottom plate (11) on the same side, a clamping groove (114) matching the clamping block (25) on the same side is provided on the opposite side of the two bottom plates (11), a movable groove (1141) is provided on the inner wall of the clamping groove (114), a positioning assembly is provided in the movable groove (1141), and the two baffles (2) on the same side are fixed to the bottom plate (11) on the same side by a first bolt (21); The surfaces of the baffles (2) are each provided with a through groove (22), and a top plate (4) is provided above the two bottom plates (11), and two symmetrically distributed support plates (42) are fixedly installed on the top of the top plate (4), and the baffle (2) and the support plate (42) on the same side are screwed together and fixed by a third bolt (5) and a nut (51), and a connecting plate (6) is provided between the two baffles (2) in the longitudinal direction, and the two ends of the connecting plate (6) are fixed to the baffle (2) on the same side by a second bolt (23); A sling structure (7) is provided between the two connecting plates (6), and the sling structure (7) includes a main steel cable (71), and two symmetrically distributed auxiliary steel cables (72) are provided at the bottom end of the main steel cable (71), and a second hook (73) is provided at the bottom end of each of the two auxiliary steel cables (72). The top ends of the two connecting plates (6) are provided with a first lifting ear (61) that matches the second hook (73) on the same side.

2. The lifting device for dismantling an old bridge according to claim 1, characterized in that: The stable structure (12) comprises a support rod (121) arranged between two bottom plates (11), a receiving groove (1211) is provided at both ends of the support rod (121), a moving rod (122) is slidably installed in the receiving groove (1211), a support block (1221) is fixedly installed at the opposite end of the two moving rods (122) in the same group, and a support groove (113) matching the support block (1221) on the same side is provided on the opposite side of the two bottom plates (11), and the two moving rods (122) in the same group are fixedly installed at the opposite end of the two moving rods (122). A second spring (1212) is fixedly connected between the opposite side of the rod (122) and the inner wall of the opposite side of the receiving groove (1211) of the same group. A handle is fixedly installed at the bottom of the opposite end of the two moving rods (122) of the same group. The bottom end of the handle slides through the receiving groove (1211) of the same group. The bottom ends of the two bottom plates (11) are provided with a plurality of support blocks (111) distributed in a linear array. The top end of the support block (111) on the same side contacts the bottom end of the corresponding moving rod (122) on the same side.

3. The lifting device for dismantling an old bridge according to claim 2, characterized in that: Slide blocks are fixedly mounted on both sides of opposite ends of the two moving rods (122) in the same group, and a sliding groove matching the slide blocks on the same side is provided on the inner wall of the receiving groove (1211).

4. The lifting device for dismantling an old bridge according to claim 1, characterized in that: The positioning assembly includes a positioning rod (1143) slidably installed in the movable groove (1141), and a first spring (1142) is fixedly connected between the inner wall of the side of the positioning rod (1143) away from the same side of the clamping block (25) and the side opposite to the movable groove (1141) of the same group, and the side wall of the clamping block (25) is provided with a positioning groove matching the opposite end of the positioning rod (1143) of the same group.

5. The lifting device for dismantling an old bridge according to claim 4, characterized in that: Two symmetrically distributed limiting blocks are fixedly mounted on the side wall of the positioning rod (1143) close to one end of the first spring (1142) on the same side, and the inner wall of the movable groove (1141) is provided with limiting grooves matching the two limiting blocks in the same group.

6. The lifting device for dismantling an old bridge according to claim 1, characterized in that: Two symmetrically distributed positioning blocks (62) are fixedly mounted on both ends of the two connecting plates (6), and grooves (24) matching the positioning blocks (62) are formed on the top ends of the baffles (2).

7. The lifting device for dismantling an old bridge according to claim 1, characterized in that: The inner side walls of the second hooks (73) are hinged with a blocking rod (731), and a third spring (732) is fixedly connected between the side walls of the blocking rod (731) and the inner walls of the second hooks (73) in the same group.

8. The lifting device for dismantling an old bridge according to claim 1, characterized in that: The side walls of the two auxiliary steel cables (72) are both sleeved with a sleeve (721), and the side walls of the two sleeves (721) are provided with two second lifting ears (722) that are rotationally symmetrically distributed. The top ends of the two top plates (4) are both fixedly mounted with two symmetrically distributed pulling steel cables (41), and the top ends of the pulling steel cables (41) are both provided with a first hook (411), and the first hook (411) is hooked with the second lifting ear (722) on the same side.

9. The lifting device for dismantling an old bridge according to claim 1, characterized in that: A plurality of limiting plates (3) distributed in a linear array are provided on opposite sides of the two bottom plates (11); an inserting block (31) is fixedly installed on the bottom of the limiting plate (3) close to the bottom plate (11) on the same side; a slot (112) matching the inserting block (31) on the same side is provided on opposite sides of the two bottom plates (11); a rubber rod (1121) is fixedly installed on the side of the slot (112) away from the limiting plate (3) on the same side; and a rubber groove matching the rubber rod (1121) of the same group is provided on the side of the inserting block (31) away from the limiting plate (3) in the same group.

10. A method for hoisting a bridge for dismantling an old bridge, according to the hoisting device for dismantling an old bridge according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Assembling the bottom plate (11): placing the two bottom plates (11) at the bottom of the old bridge, and then passing the existing fixing bolts through the bottom plates (11) and extending into the old bridge, which can play the role of fixing the bottom plates (11). Then, placing the baffle (2) outside the bottom plate (11), so that the block (25) installed on the side wall of the lower section of the baffle (2) is engaged with the slot (114) opened on the side wall of the bottom plate (11), which can play the role of preliminarily fixing the baffle (2). A positioning component is provided in the slot (114), which plays the role of positioning and fixing the block (25), and then plays the role of positioning the baffle (2). Then, the baffle (2) and the bottom plate (11) are penetrated by the first bolt (21), so as to fix the baffle (2). After the baffle (2) is fixed, the staff places the top plate (4) on the top of the old bridge. Then, the baffle (2) and the top plate (4) are assembled by the third bolt (5), the nut (51) and the support plate (42) installed on the top of the top plate (4). The surface of the baffle (2) is provided with a through groove (22), which facilitates the assembly of old bridges of different thicknesses. Then, the connecting plate (6) is placed between the two longitudinal baffles (2) and fixed by the second bolt (23); S2. Installation of the stable structure (12): After the installation of the base plate (11) is completed, the same-side moving rod (122) is pulled by the handle to slide into the same group of receiving grooves (1211), and then the same group of support rods (121) and moving rods (122) are placed between the two base plates (11), so that the support block (1221) provided at the opposite end of the moving rod (122) is engaged with the support groove (113) provided on the inner side of the base plate (11). Through the cooperation of the moving rod (122) and the second spring (1212), the distance between the two moving rods (122) in the same group can be adjusted, which is convenient for supporting old bridges of different widths. Through the cooperation of the support rod (121) and the moving rod (122), the bottom of the old bridge can be supported and stabilized, which is conducive to maintaining the stability of the old bridge when it is lifted; S3. Lifting the old bridge: After the installation of the base plate (11), the stabilizing structure (12), the baffle (2) and the connecting plate (6) is completed, the second hooks (73) installed at the ends of the two auxiliary steel cables (72) in the sling structure (7) are connected to the first lifting lug (61) installed at the top of the connecting plate (6). The cooperation of the baffle rod (731) and the third spring (732) in the second hook (73) is conducive to maintaining the stability of the connection between the second hook (73) and the first lifting lug (61) on the same side. Then, the main steel cable (71) is connected to the existing crane, and then the old bridge can be lifted by the crane.

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