Opposite-pulling locking device for connecting large double-wall steel jacket box for framing hoisting

Abstract

The utility model provides an opposite-pulling locking device for connecting large double-wall steel jacket boxes for framing hoisting. The opposite-pulling locking device comprises a first pushing frame and a second pushing frame, wherein the first pushing frame is mounted on a left steel jacket box; the second pushing frame is mounted on a right steel jacket box; the device further comprises an opposite-pull pressure applying device and an opposite-pull force transmission rod. The opposite-pull force transmission rod sequentially penetrates through the opposite-pull pressure applying device, the first pushing frame and the second pushing frame; the opposite-pulling pressure applying device is installed between the first base plate and the first pushing frame, and a fixing part is arranged on the side, away from the opposite-pulling pressure applying device, of the first base plate. The first pushing frame comprises a front pushing plate and a rear pushing plate which are arranged in parallel, and a locking part is arranged on the inner side of the front pushing plate and connected with the opposite-pull force transmission rod; a fixing part is arranged in front of the second pushing frame and is connected with the opposite-pull dowel bar; the opposite-pulling pressure applying device is externally connected with a driving device, and the driving device stretches and pulls the opposite-pulling pressure applying device to enable the left steel jacket box and the right steel jacket box to be attached and locked through the locking component.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and specifically to a tie-locking device for connecting large double-walled steel caissons for segmented hoisting. Background Technology

[0002] Steel cofferdams, as a crucial structure in bridge foundation construction, effectively reduce water erosion of the foundation and serve as collision protection in navigable waterways. The sectional hoisting of double-walled steel cofferdams requires lowering the left and right halves sequentially, then securing them together with tie rods. However, current technology lacks stable and reliable tie rod locking devices. Existing tie rod locking devices are complex in structure, cumbersome to operate, and costly; they lack precise tension control methods, making it difficult to meet the stability requirements of welding; and they are not adaptable to steel cofferdams of different specifications. Utility Model Content

[0003] This utility model provides a pull-locking device for connecting large double-walled steel casings in segmented hoisting, which has a simple structure, is easy to operate, and meets the stability requirements of steel casing docking during welding.

[0004] To solve the above-mentioned technical problems, this utility model provides a counter-locking device for connecting large double-walled steel casings for segmented hoisting, including a first pusher for installation on the left steel casing and a second pusher for installation on the right steel casing; it also includes a counter-locking pressure device and a counter-locking force transmission bar;

[0005] The counter-pull force transmission bar passes sequentially through the counter-pull pressure device, the first push frame, and the second push frame;

[0006] The counter-pull pressure device is installed between the first pad and the first push frame, and a fixing component is provided on the side of the first pad away from the counter-pull pressure device;

[0007] The first jacking frame includes a front jacking plate and a rear jacking plate arranged in parallel. A locking component is provided on the inner side of the front jacking plate and connected to the counter-pull force transmission rod. A fixing component is provided at the front of the second jacking frame and connected to the counter-pull force transmission rod.

[0008] The tensioning and pressing device is connected to an external driving device. The driving device tensions the tensioning and pressing device so that the left and right steel sleeves fit together and are locked by the locking component.

[0009] In some embodiments, a mating ring plate is installed in the mating joint between the left and right steel sleeves.

[0010] In some embodiments, a wall reinforcement plate is provided between the first jacking frame and the wall of the left steel casing; a wall reinforcement plate is provided between the second jacking frame and the wall of the right steel casing.

[0011] In some embodiments, the first and second pushers each have 45-50mm holes for the pull rod to pass through.

[0012] In some embodiments, the diameter of the hole in the front push plate of the first pusher is longer than that in the rear push plate.

[0013] In some embodiments, the counter-pressure device is a through-hole jack.

[0014] In some embodiments, the tension bar is a finely rolled threaded steel bar.

[0015] In some embodiments, the fixing component is a fixing nut, the locking component is a locking nut, and the fixing nut and the locking nut are threadedly connected to the precision-rolled threaded steel bar.

[0016] In some embodiments, a second pad is provided between the locking component and the push plate, and between the fixing component located in front of the second push frame and the second push frame.

[0017] In some embodiments, the drive device is a hydraulic pump connected to the oil pipe of the through-hole jack.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model requires only a few parts such as a pusher frame, a counter-pull pressure device, and a counter-pull force transmission rod, resulting in low cost, simple structure, and easy operation.

[0020] 2. This utility model effectively prevents deformation of the casing by setting a wall reinforcement plate between the push frame and the steel casing wall.

[0021] 3. This utility model can be adapted to steel housings of various sizes by replacing jacks of different specifications. Attached Figure Description

[0022] Figure 1 This is a side view of the pull-locking device for connecting large double-walled steel casings used for segmented hoisting, as described in this utility model, installed in the steel casing.

[0023] Figure 2 This is a top view of the pull-locking device for connecting large double-walled steel casings used in segmented hoisting according to this utility model;

[0024] Figure 3 This is a cross-sectional view of the front push plate;

[0025] Figure 4 This is a schematic diagram showing the left and right steel casings after they are connected.

[0026] Figure 5 This is a schematic diagram of the interface between the left and right steel jackets.

[0027] Reference numerals in the attached diagram: 1. Through-hole jack; 2. Tool nut; 3. Locking nut; 4. Fixing nut; 5. Second jacking frame; 6. First jacking frame; 601. Front jacking plate; 602. Rear jacking plate; 7. Wall reinforcement plate; 8. Connecting ring plate; 9. Precision rolled threaded steel bar; 10. Right steel sleeve box; 11. Left steel sleeve box; 12. First pad plate; 13. Second pad plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted 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; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0031] Reference Figure 1-5 This embodiment provides a pull-locking device for connecting large double-walled steel caissons for segmented hoisting, including a first pusher 6 for installation on the left steel caisson 11 and a second pusher 5 for installation on the right steel caisson 10; it also includes a pull-pressurizing device 100-ton through-hole jack 1 and a pull-transfer force bar 9 made of finely rolled threaded steel; the diameter of the finely rolled threaded steel 9 is 40mm.

[0032] The first jacking frame 6 and the second jacking frame 5 each have a 45-50mm hole for the fine-rolled threaded steel bar 9 to pass through. The fine-rolled threaded steel bar 9 passes through the through-hole jack 1, the first jacking frame 6 and the second jacking frame 5 in sequence; the through-hole jack 1 is installed between the first pad 12 and the first jacking frame 6, and a tool nut 2 is provided on the side of the first pad 12 away from the through-hole jack 1 to be threadedly connected to the fine-rolled threaded steel bar 9 to fix the through-hole jack 1.

[0033] Furthermore, the first pusher frame 6 includes a front pusher plate 601 and a rear pusher plate 602 arranged in parallel. The inner side of the front pusher plate 601 is provided with a locking nut 3 and connected to the precision-rolled threaded steel bar 9. Similarly, a fixing nut 4 is provided at the front of the second pusher frame 5 and connected to the precision-rolled threaded steel bar 9.

[0034] The through-hole jack 1 is connected to two external hydraulic oil pumps. The hydraulic oil pumps are connected and fixed to the oil pipes of the through-hole jack. The construction personnel operate the hydraulic oil pumps to tension the joints of the left steel sleeve 11 and the right steel sleeve 10, and tighten the locking nut 3 to achieve the tension locking of the left steel sleeve 11 and the right steel sleeve 10.

[0035] During construction, in some cases, the steel casing may not be lowered to the designed elevation, resulting in a height difference of several centimeters between the left steel casing 11 and the right steel casing 10. In order to ensure that the left steel casing 11 and the right steel casing 10 can be welded together in this case, in this embodiment, a connecting ring plate 8 is installed in the joint between the left steel casing 11 and the right steel casing 10 to compensate for the height difference between them.

[0036] To prevent excessive local stress and deformation of the casing wall during the pulling process at the connection points of the first jacking frame 6 and the left steel casing 11, and the connection points of the second jacking frame 5 and the right steel casing 10, a wall reinforcement plate 7 is provided between the wall of the first jacking frame 6 and the left steel casing 11; a wall reinforcement plate 7 is also provided between the wall of the second jacking frame 5 and the right steel casing 10. The wall reinforcement plate 7 strengthens the casing wall.

[0037] To prevent the fixing nut 4 at the front end of the second pusher frame from failing to be installed due to excessive horizontal position deviation between the left steel sleeve 11 and the right steel sleeve 10, the diameter of the hole in the front pusher plate 601 of the first pusher frame 6 is increased to about 80mm compared to the rear pusher plate, so that the precision rolled threaded steel bar 9 can have a larger angle of movement when docking.

[0038] To prevent stress concentration at the connection points between the locking nut 3 and the first push plate, and between the fixing nut 4 and the second push frame during pull, thus preventing damage to the first push plate and the second push frame, a second pad 13 is provided between the locking nut 3 and the first push plate, and between the fixing nut 4 and the second push frame, to increase the contact area between them and avoid stress concentration that could damage the first push plate and the second push frame.

[0039] The specific construction method of the tie-locking device for connecting large double-walled steel caissons used in segmented hoisting in this embodiment is as follows:

[0040] In this embodiment, a total of 8 sets of the tie-locking device are installed at the interface between the two steel casings: 4 sets on the deck of the steel casing, 2 sets on the inner wall of the steel casing, and 2 sets on the outer wall of the steel casing. When lowering the steel casing, the left steel casing 11 is lowered first, followed by the right steel casing 10. During the steel casing processing stage, a 3cm thick wall reinforcement plate 7 is welded to the location of the first push plate and the second push frame at the tie-locking position to reinforce the wall of the steel casing.

[0041] The first jacking frame 6 is welded to the left steel casing 11 (lowered first), and the second jacking frame 5 is welded to the right steel casing (lowered later). Simultaneously, the through-hole of the 100-ton through-hole jack 1 is inserted into the precision-rolled threaded steel bar 9, and the tool nut 2 is tightened to fix the 100-ton through-hole jack 1 onto the first jacking frame 6. The oil pipe of the through-hole jack 1 is then pulled to the top surface of the steel casing and fixed to the raised cofferdam. The locking nut 3 (not tightened) and the second pad 13 also need to be installed inside the front jacking plate 601 to facilitate locking after the pull-out is completed.

[0042] Next, the steel caissons were lowered in sections. After the left steel caisson 11 was lowered and secured, the floating crane lowered the right steel caisson 10 onto the steel casing supported by the hoisting system. The floating crane maintained a lifting weight of approximately 70% of the caisson's weight to prevent significant misalignment between the two jacking frames, which would prevent the threaded steel bars 9 from being inserted. Before the pull-locking mechanism was engaged, the construction workers installed four sets of fixing nuts 4 on the top surface of the main deck, and divers installed four sets of fixing nuts 4 on both sides of the steel caisson wall underwater. The construction workers installed two hydraulic oil pumps (1 to 4), and connected and secured them to the oil pipes of the eight sets of through-hole jacks 1 of the pull-locking device.

[0043] The floating crane slightly lifts the right steel casing 10 (the distance between the suspension system and the top surface of the supporting steel casing is 2-3cm). Construction workers operate two hydraulic pumps simultaneously to pull the right steel casing 10 and left steel casing 11 together tightly, then tighten the locking nut 3. After the joint gap meets the design requirements, the floating crane slowly lowers the steel casing. Once in place, the tightness of the locking nut 3 is checked; if there are no problems, the jacks are removed. After the welding of the left and right steel casings is completed, the locking nut 3 can be loosened and the first jacking frame 6 and the second jacking frame 5 can be removed.

[0044] The above description is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model by those skilled in the art within the scope of the technology disclosed in the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A matched locking device for connecting large double-wall steel sleeve boxes hoisted in sections, characterized in that, It includes a first jacking frame for installation in the left steel casing and a second jacking frame for installation in the right steel casing; it also includes a tensioning and pressure-applying device and a tensioning force transmission bar; The counter-pull force transmission bar passes sequentially through the counter-pull pressure device, the first push frame, and the second push frame; The counter-pull pressure device is installed between the first pad and the first push frame, and a fixing component is provided on the side of the first pad away from the counter-pull pressure device; The first jacking frame includes a front jacking plate and a rear jacking plate arranged in parallel. A locking component is provided on the inner side of the front jacking plate and connected to the counter-pull force transmission rod. A fixing component is provided at the front of the second jacking frame and connected to the counter-pull force transmission rod. The tensioning and pressing device is connected to an external driving device. The driving device tensions the tensioning and pressing device so that the left and right steel sleeves fit together and are locked by the locking component.

2. The matched locking device for connecting large double-wall steel sleeve boxes hoisted in sections, according to claim 1, characterized in that, A mating ring plate is installed in the joint between the left and right steel sleeve boxes.

3. The matched locking device for connecting large double-wall steel sleeve boxes hoisted in sections, according to claim 1, characterized in that, A wall reinforcement plate is provided between the first jacking frame and the wall of the left steel casing; a wall reinforcement plate is provided between the second jacking frame and the wall of the right steel casing.

4. The matched pair of locking devices for connecting large double wall steel casing sections hoisted in sections, according to claim 1, characterized in that, The first and second push frames each have 45-50mm holes for the pull rod to pass through.

5. The matched pair of locking devices for connecting large double wall steel casing sections hoisted in sections, according to claim 4, characterized in that, The diameter of the hole in the front push plate of the first push frame is longer than that in the rear push plate.

6. The matched pair of locking devices for connecting large double wall steel casing sections hoisted in sections, according to claim 1, characterized in that, The counter-pressure device is a through-hole jack.

7. The matched pair of locking devices for connecting large double wall steel casing sections hoisted in sections, according to claim 1, characterized in that, The tension bar is a precision-rolled threaded steel bar.

8. The matched pair of locking devices for connecting large double-walled steel casing sections hoisted in sections, according to claim 7, characterized in that, The fixing component in front of the second jacking frame is a fixing nut, and the locking component is a locking nut. The fixing nut and the locking nut are threadedly connected to the fine-rolled threaded steel bar.

9. The matched pair of locking devices for connecting large double wall steel casing sections hoisted in sections as claimed in claim 1, wherein, A second pad is provided between the locking component and the push plate, and between the fixing component located in front of the second push frame and the second push frame.

10. The matched pair of locking devices for connecting large double wall steel casing sections hoisted in sections as claimed in claim 6, wherein, The driving device is a hydraulic oil pump, which is connected to the oil pipe of the through-hole jack.

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