Construction device for sinking of steel jacket box under sludge geological condition

Abstract

The utility model discloses a construction device for sinking a steel jacket box under the silt geological condition. The construction device comprises a lowering platform, a first sinking mechanism and a second sinking mechanism. The lowering platform is installed on the steel casing, and the first sinking mechanism is installed on the lowering platform and connected with the steel jacket box. The second sinking mechanism comprises a lifting mechanism, a lifting connecting rope and a steering wheel, the lifting mechanism is installed on the lowering platform, the steering wheel is installed on the steel casing and located below the lowering platform, the lifting connecting rope is connected with the steel jacket box, and the lifting connecting rope is connected with the lifting mechanism after bypassing the steering wheel to be steered. According to the construction device for sinking the steel jacket box under the sludge geological condition, the problem that the jacket box is difficult to sink under the sludge geological condition is solved, the construction efficiency of cofferdam sinking is improved, and the first sinking mechanism and the second sinking mechanism are used in cooperation, so that the safety of jacket box cofferdam sinking is guaranteed. The idea that the cofferdam is lowered firstly and then the sludge is sucked is adopted, and large excavation of the sludge before the cofferdam is lowered is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cofferdam construction, and particularly relates to a construction device for sinking a steel casing under silt geological conditions. Background Technique

[0002] In recent years, the construction of coastal urban transportation infrastructure has developed rapidly, and bridge construction has gradually extended from large bridges spanning rivers to super-large bridges flying across the ocean. There are many uncertain factors in the underwater foundation construction of water-crossing bridges, especially the foundation construction in the ocean area, which belongs to key and difficult projects. Therefore, a reasonable selection of the construction plan for underwater foundation construction is the key to the entire bridge construction. Especially how to efficiently and qualityly complete the underwater foundation construction in a complex marine environment has become the key and difficult points for each bridge engineer to study.

[0003] As a temporary facility for bridge foundation construction, the main function of the cofferdam is to serve as a water isolation device for underwater foundation construction or the excavation protection retaining of deep foundation pits, so as to install the bearing platform in a water-free and safe condition, as well as the subsequent steel bar binding and concrete pouring construction of the reserved holes. The steel casing cofferdam can withstand a large water pressure and ensure the safe flood passing of the foundation throughout the year. Especially under some difficult construction conditions or restricted by hydrological, topographical and geological conditions where retaining structures such as steel sheet piles and island cofferdams cannot be used, the steel casing shows its superiority even more. Therefore, the steel casing cofferdam is more and more widely used in the foundation construction of large deep-water bridges.

[0004] However, in the southeastern coastal areas of our country, the thickness of the riverbed silt formation is up to 30m - 50m. When constructing a steel casing cofferdam, after the steel casing enters the mud, the side friction resistance and end friction resistance of the silt on the cofferdam wall are large, the cofferdam sinks difficultly, and the safety risk during operation is relatively large. Content of the Utility Model

[0005] Based on this, in view of the problems of difficult sinking of the cofferdam and relatively large safety risk during operation under silt geological conditions, it is necessary to provide a construction device for sinking a steel casing under silt geological conditions.

[0006] A construction device for sinking a steel casing under silt geological conditions includes:

[0007] A lowering platform, which is installed on the steel casing;

[0008] A first sinking mechanism, the first sinking mechanism is installed on the lowering platform, the first sinking mechanism is connected to the steel casing, and the first sinking mechanism is used to lower the steel casing; and

[0009] The second sinking mechanism includes a lifting mechanism, a lifting connecting rope and a steering wheel. The lifting mechanism is installed on the lowering platform, the steering wheel is installed on the steel casing and is located below the lowering platform. One end of the lifting connecting rope is connected to the steel casing, and the other end of the lifting connecting rope bypasses the steering wheel and then is connected to the lifting mechanism after steering.

[0010] For the construction device for sinking the steel casing under the above-mentioned silt geological conditions, the first sinking mechanism lowers the steel casing to sink, and the steel casing sinks by its own weight. After the steel casing sinks to the self-stabilizing position, the lifting mechanism of the second sinking mechanism pulls the lifting connecting rope. Due to the steering of the lifting connecting rope passing through the steering wheel, the upward pulling force of the lifting mechanism is turned into a downward pulling force to pull the steel casing to sink downward. At this time, the first sinking mechanism is used to prevent accidents such as sudden sinking. During the pulling and sinking process, when it is no longer possible to continue sinking, a dredger can be used to pump out a part of the silt near the wall panel in the cofferdam and then continue the sinking construction. After the sinking is in place, dredge to the bottom elevation of the underwater concrete.

[0011] In one embodiment, the first sinking mechanism includes a lowering jack and a lowering steel strand. The lowering jack is installed on the lowering platform, and the lowering steel strand connects the steel casing and the lowering jack.

[0012] In one embodiment, the lifting connecting rope includes a lifting steel strand, a steel wire rope and a connector. The lifting steel strand is connected to the lifting mechanism. One end of the steel wire rope is connected to the steel casing, and the other end of the steel wire rope bypasses the steering wheel and is connected to the lifting steel strand through the connector.

[0013] In one embodiment, the connector includes an anchor cup, an anchor, a connecting ring and a shackle. The anchor is installed in the anchor cup. The lifting steel strand is connected to the anchor. The connecting ring is connected to the anchor cup, and the steel wire rope is connected to the connecting ring through the shackle.

[0014] In one embodiment, the anchor is provided with a wire splitting hole. After the lifting steel strand is split, it passes through the wire splitting hole, and a tapered clamping piece is arranged in the wire splitting hole to anchor the steel wire in the wire splitting hole.

[0015] In one embodiment, the lifting mechanism is a lifting jack. The lifting jack is a through-hole jack, and the lifting steel strand is installed in the lifting jack.

[0016] In one embodiment, the first sinking mechanism and the second sinking mechanism are arranged at intervals on the lowering platform, and the second sinking mechanism is located between the first sinking mechanism and the steel casing.

[0017] In one embodiment, the first sinking mechanism is connected to the top of the steel casing box, and the lifting connection rope of the second sinking mechanism is connected to the inner wall of the steel casing box.

[0018] In one embodiment, a guiding device is further included, and the guiding device is installed on the steel casing for guiding the sinking of the steel casing box.

[0019] In one embodiment, the lowering platform is a bracket assembled corbel.

[0020] The construction device for sinking the steel casing box under the above-mentioned silt geological conditions solves the problem that it is difficult to sink the casing box under the silt geological conditions, can achieve continuous sinking, improves the construction efficiency of the cofferdam sinking, shortens the construction period, and the first sinking mechanism and the second sinking mechanism are used in combination to ensure the safety of the sinking of the casing cofferdam. By adopting the idea of first lowering the cofferdam and then sucking mud, compared with the hanging box cofferdam, it avoids the large-scale excavation of silt before the cofferdam is lowered, reduces the amount of silt excavation, avoids the phenomenon of back-silting under the action of water flow and tides, ensures the structural safety, and the mud sucking is completed inside the cofferdam, and there will be no phenomenon of sewage overflow, which has a positive effect on environmental protection. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for the specific embodiments will be briefly introduced below. In all the drawings, the components or parts do not necessarily draw according to the actual ratio.

[0022] Figure 1 It is a schematic structural diagram of the construction device for sinking the steel casing box under the silt geological conditions in one embodiment;

[0023] Figure 2 For Figure 1 The top view of the construction device for sinking the steel casing box under the shown silt geological conditions;

[0024] Figure 3 For Figure 1 The schematic structural diagram of the connector in;

[0025] Figure 4 It is a schematic structural diagram of the first sinking mechanism sinking the steel casing box;

[0026] Figure 5 It is a schematic diagram of the second sinking mechanism and the first sinking mechanism cooperating to sink the steel casing box;

[0027] Figure 6 It is a schematic diagram of using a mud suction machine to suck sludge.

[0028] Reference Signs:

[0029] 1 - Steel casing, 2 - Steel caisson, 10 - Lowering platform, 20 - First sinking mechanism, 21 - Lowering jack, 22 - Lowering steel strand, 30 - Second sinking mechanism, 31 - Lifting mechanism, 32 - Lifting connecting rope, 321 - Lifting steel strand, 322 - Steel wire rope, 33 - Steering wheel, 40 - Connector, 41 - Anchor cup, 42 - Anchor, 43 - Connecting ring, 44 - Shackle, 45 - Tapered clamping piece, 50 - Guide device, 60 - Suction dredger. Detailed implementation mode

[0030] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation mode of the present utility model is made in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific implementations disclosed below.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation mode.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used herein in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0033] Please refer to Figure 1 and Figure 2 , in a construction device for sinking a steel caisson under silt geological conditions in an implementation mode, including a lowering platform 10, a first sinking mechanism 20 and a second sinking mechanism 30.

[0034] The lowering platform 10 is installed on the steel casing 1, and the lowering platform 10 serves as an operating platform for lowering the steel caisson 2. In an implementation mode, the lowering platform 10 is a bracket-assembled corbel. It can be understood that in other implementation modes, the lowering platform 10 can also be of other structures as long as it can form a plane for installing the first sinking mechanism 20 and the second sinking mechanism 30.

[0035] The first sinking mechanism 20 is installed on the lowering platform 10. The first sinking mechanism 20 is connected to the steel casing 2. The first sinking mechanism 20 is used to lower the steel casing 2, and the steel casing 2 sinks under its own weight. In one embodiment, the first sinking mechanism 20 includes a lowering jack 21 and lowering steel strands 22. The lowering jack 21 is installed on the lowering platform 10. One end of the lowering steel strands 22 is connected to the steel casing 2, and the other end is connected to the lowering jack 21. By the telescoping of the lowering jack 21, the sinking of the steel casing 2 can be realized. It can be understood that in other embodiments, the first sinking mechanism 20 can also be a hydraulic cylinder cooperating with a rope structure, as long as the lowering of the steel casing 2 can be achieved.

[0036] The second sinking mechanism 30 is installed on the lowering platform 10. The second sinking mechanism 30 is used to pull the steel casing 2 to continue to sink in the silt. In one embodiment, to avoid the spatial position conflict between the first sinking mechanism 20 and the second sinking mechanism 30, the first sinking mechanism 20 and the second sinking mechanism 30 are arranged at intervals on the lowering platform 10, and the second sinking mechanism 30 is located between the first sinking mechanism 20 and the steel casing 1. Further, the first sinking mechanism 20 is connected to the top of the steel casing 2, and the second sinking mechanism 30 is connected to the inner wall of the steel casing 2.

[0037] In one embodiment, the second sinking mechanism 30 includes a lifting mechanism 31, a lifting connecting rope 32 and a steering wheel 33. The lifting mechanism 31 is installed on the lowering platform 10. The steering wheel 33 is installed on the steel casing 1, and the steering wheel 33 is located below the lowering platform 10. One end of the lifting connecting rope 32 is connected to the steel casing 2, and the other end of the lifting connecting rope 32 bypasses the steering wheel 33 and then is connected to the lifting mechanism 31.

[0038] Wherein, the lifting mechanism 31 pulls the lifting connecting rope 32 upward. Due to the turning of the lifting connecting rope 32 through the steering wheel 33, the upward pulling force of the lifting mechanism 31 turns into a downward pulling force to pull the steel casing 2 to sink downward.

[0039] In one embodiment, the lifting mechanism 31 is a lifting jack. To realize the cooperation between the lifting connecting rope 32 and the lifting jack, the lifting connecting rope 32 includes a lifting steel strand 321, a steel wire rope 322 and a connector 40. Among them, the lifting steel strand 321 is connected to the lifting mechanism 31.

[0040] Specifically, the lifting jack is a through-type jack, and the lifting steel strand 321 is arranged inside the through-type jack. Since the steel strand cannot be bent, it cannot pass through the steering wheel 33, and the steel wire rope 322 cannot cooperate with the jack. Therefore, one end of the steel wire rope 322 is connected to the steel casing 2, and the other end of the steel wire rope 322 bypasses the steering wheel 33 and is connected to the lifting steel strand 321 through the connector 40. Through such a design, the connection between the rope and the lifting jack is realized, and at the same time, the rope passes through the steering wheel 33 for steering.

[0041] Please refer to Figure 3 as well. On the basis of the above embodiments, further, the connector 40 includes an anchor cup 41, an anchor 42, a connecting ring 43 and a shackle 44. The anchor 42 is installed inside the anchor cup 41, and the lifting steel strand 321 is connected to the anchor 42. Specifically, the anchor 42 is provided with wire splitting holes, and after the lifting steel strand 321 is wire split, it passes through the wire splitting holes. Tapered clamping pieces 45 are arranged in the wire splitting holes to anchor the steel wires in the wire splitting holes. The connecting ring 43 is connected to the anchor cup 41, and the steel wire rope 322 is connected to the connecting ring 43 through the shackle 44.

[0042] It can be understood that in other ways, the lifting mechanism 31 can also adopt other structures, such as using a hydraulic cylinder and other structures. At this time, the lifting connecting rope 32 does not need to be divided into two sections, and can be directly designed as a single steel wire rope 322.

[0043] Please refer to Figure 4 as well. In an embodiment, the construction device for sinking the steel casing under the silt geological conditions further includes a guiding device 50. The guiding device 50 is installed on the steel casing 1 and is used to guide the sinking of the steel casing 2. Specifically, the guiding device 50 can be a circular ring that can contact the inner wall of the steel casing 2.

[0044] Please refer to Figures 4 to 6 as well. The usage method of the above construction device for sinking the steel casing under the silt geological conditions is specifically as follows:

[0045] After the cofferdam of the steel casing 2 is assembled, a lowering platform 10 is arranged at the top of the steel casing 1, and the first lowering mechanism 20 is installed. The lowering steel strand 22 of the first lowering mechanism 20 is connected to the steel casing 2, and the lowering jack 21 is used for the lowering construction of the steel casing 2. During the lowering process, pay attention to controlling the coordination of each lowering jack 21, and at the same time ensure that the verticality of the cofferdam meets the requirements.

[0046] After the cofferdam contacts the silt and is in a self-stabilizing position, the second lowering mechanism 30 is installed. The steel wire rope 322 in the second lowering mechanism 30 is connected to the steel casing 2. After the steel wire rope 322 bypasses the steering wheel 33, the steel wire rope 322 is connected to the lifting steel strand 321 through the connector 40, and then the lifting steel strand 321 is inserted into the lifting jack.

[0047] The lifting jack pulls the lifting steel strand 321 upward. Since the steel wire rope 322 is redirected by the turning wheel 33, the steel wire rope 322 pulls the steel casing 2 downward. During the process of the lifting jack pulling the steel casing 2 downward, the lowering jack 21 synchronously follows the same distance to prevent accidents such as sudden sinking during the process of pulling the cofferdam in.

[0048] During the jacking process, when it is no longer possible to continue sinking, a dredger 60 can be used to pump out a part of the silt near the bulkhead inside the cofferdam and then continue the sinking. After the sinking is in place, dredge until the bottom elevation of the blinding concrete is reached, and prepare for blinding.

[0049] The construction device for sinking the steel casing under the above-mentioned silt geological conditions solves the problem of difficult sinking of the casing under the silt geological conditions, can achieve continuous sinking, improves the construction efficiency of the cofferdam sinking, shortens the construction period, and the first sinking mechanism 20 and the second sinking mechanism 30 are used in combination to ensure the safety of the sinking of the casing cofferdam. By adopting the idea of first lowering the cofferdam and then dredging, compared with the hanging box cofferdam, it avoids the large-scale excavation of silt before the cofferdam is lowered, reduces the amount of silt excavation, avoids the phenomenon of re-silting under the action of water flow and tides, ensures the structural safety, and the dredging is all completed inside the cofferdam, and there will be no phenomenon of sewage overflow, which has a positive effect on environmental protection.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention.

Claims

1. A construction device for the sinking of a steel casing box under silt geological conditions, characterized in that, Comprising: A lowering platform, installed on the steel casing; A first sinking mechanism, the first sinking mechanism is installed on the lowering platform, the first sinking mechanism is connected to the steel cofferdam, and the first sinking mechanism is used to lower the steel cofferdam; And A second sinking mechanism, including a lifting mechanism, a lifting connecting rope and a steering wheel, the lifting mechanism is installed on the lowering platform, the steering wheel is installed on the steel casing and is located below the lowering platform, one end of the lifting connecting rope is connected to the steel cofferdam, and the other end of the lifting connecting rope bypasses the steering wheel and is connected to the lifting mechanism after turning.

2. The construction device for the sinking of the steel casing under the silt geological condition according to claim 1, wherein The first sinking mechanism includes a lowering jack and a lowering steel strand, the lowering jack is installed on the lowering platform, and the lowering steel strand connects the steel cofferdam and the lowering jack.

3. The construction device for the sinking of the steel casing under the silt geological condition according to claim 1, characterized in that, The lifting connecting rope includes a lifting steel strand, a steel wire rope and a connector, the lifting steel strand is connected to the lifting mechanism, one end of the steel wire rope is connected to the steel cofferdam, and the other end of the steel wire rope bypasses the steering wheel and is connected to the lifting steel strand through the connector.

4. The construction device for the sinking of the steel casing box under the silt geological conditions according to claim 3, characterized in that The connector includes an anchor cup, an anchor, a connecting ring and a shackle, the anchor is installed in the anchor cup, the lifting steel strand is connected to the anchor, the connecting ring is connected to the anchor cup, and the steel wire rope is connected to the connecting ring through the shackle.

5. The construction device for sinking a steel casing box under silt geological conditions according to claim 4, characterized in that, The anchor is provided with a wire splitting hole, the lifting steel strand is split and then passes through the wire splitting hole, and a tapered clip is arranged in the wire splitting hole to anchor the steel wire in the wire splitting hole.

6. The construction device for the sinking of the steel casing under the silt geological condition according to claim 3, characterized in that, The lifting mechanism is a lifting jack, the lifting jack is a through-hole jack, and the lifting steel strand is installed in the lifting jack.

7. The construction device for the sinking of the steel casing box under the silt geological condition according to claim 1, characterized in that, The first sinking mechanism and the second sinking mechanism are arranged at intervals on the lowering platform, and the second sinking mechanism is located between the first sinking mechanism and the steel casing.

8. The construction device for the sinking of the steel casing box under the silt geological condition according to claim 7, wherein, The first sinking mechanism is connected to the top of the steel cofferdam, and the lifting connecting rope of the second sinking mechanism is connected to the inner wall of the steel cofferdam.

9. The construction device for the sinking of the steel casing under the silt geological conditions according to claim 1, characterized in that, It further includes a guiding device, and the guiding device is installed on the steel casing to guide the sinking of the steel cofferdam.

10. The construction device for sinking a steel casing box under the silt geological condition according to claim 1, characterized in that, The lowering platform is a bracket-assembled corbel.

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