Cofferdam construction system with bottomed steel hanging box suspended by steel casing of complex deepwater riverbed

Abstract

The utility model relates to a cofferdam construction system of a complex deepwater riverbed steel casing suspended bottomed steel hanging box. The cofferdam construction system comprises a steel casing supporting steel cofferdam bottom plate assembling system, a side formwork installing system, a guiding device, an in-situ lifting and downward hanging system and a pouring system. The utility model has the beneficial effects that the primary load bearing of the bottom plate can be realized through the main keels and the secondary keels, and compared with the traditional technology, the factory prefabrication of the bottom plate unit can be realized by adopting the prefabrication and assembly module unit technology, the hoisting efficiency and the safety of the bottom plate are high, and the mounting groove and the second sealing rubber are arranged on the prefabrication and assembly module unit, so that the installation is convenient. The side formworks can be positioned, the sealing performance of the connecting positions of the side formworks and the bottom plate is improved, and water is prevented from permeating into the cofferdam in the cofferdam downward lifting process.

Description

Technical Field

[0001] The utility model relates to the construction field of underwater high pile foundations of bridges in the fields of highways, municipal administration, railways, etc., and in particular includes a construction system for a steel casing suspension cofferdam with a bottom steel hanging box on a complex deep-water riverbed. Background Art

[0002] In recent years, with the rapid development of my country's national economy and the continuous advancement of urbanization, transportation has increasingly become a key factor in the further development of my country's economy and cities. As a means of transportation that can overcome a variety of unfavorable conditions, bridges have been widely used in the construction of urban and inter-city transportation infrastructure. As a country with many rivers, cross-river bridges are an unavoidable working condition in bridge construction, and the underwater construction of their piers is still a key factor restricting the rapid and safe construction of bridges.

[0003] In order to solve the difficulties in bridge foundation construction, steel box cofferdams are widely used in the construction of bridge underwater platforms due to their advantages of short construction period, good water blocking effect, no need to sink into the riverbed, and little interference with navigation. However, this technology still has problems such as complex installation procedures and low installation efficiency of steel box cofferdams, difficulty in accurate positioning during the lifting and lowering of steel box cofferdams, and great influence of water buoyancy and resistance during the lowering process.

[0004] Therefore, in order to solve the common problems in the construction process of steel casing cofferdam in complex deep-water riverbed, and in view of the current situation of frequent occurrence of the above problems, complex process, high construction cost and difficult to ensure engineering quality, there is an urgent need for a complex deep-water riverbed steel casing suspended bottom steel hanging box cofferdam with quick and simple construction, safe and effective, low cost and high component installation accuracy. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provide a complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system.

[0006] This complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system includes: steel casing support steel cofferdam bottom plate assembly system, side formwork installation system, guide device, in-situ lifting and hanging system and pouring system;

[0007] The steel casing supporting steel cofferdam bottom plate assembly system comprises a keel and a prefabricated assembly module unit; the keel is temporarily fixed on the steel casing, and the prefabricated assembly module unit is placed on the keel; the prefabricated assembly module units are mortised to each other through mortise and tenon to form a bottom plate, and the bottom plate and the steel casing are slidably connected;

[0008] The side formwork installation system includes side formwork units; vertically adjacent side formwork units are connected by vertical tension steel bars, and horizontally adjacent side formwork units are connected by horizontal tension steel bars; the bottom ends of the vertical tension steel bars are inserted into the prefabricated assembly module units; the side formwork installation system and the bottom plate form a steel hanging box cofferdam;

[0009] One end of the guide device is fixed to the inner wall of the side formwork unit, and the other end is slidably connected to the steel casing; the casting system is installed between the steel casings in the steel hanging box cofferdam; the in-situ lifting and hanging system is arranged at the top of the steel casing, and the lifting and hanging of the steel hanging box cofferdam and the casting system are realized by steel strands.

[0010] Preferably, the steel casing supporting steel cofferdam bottom plate assembly system includes a main keel, a secondary keel and a prefabricated assembly module unit; the main keel is installed on both sides of the steel casing; the secondary keel is installed on the main keel; the prefabricated assembly module unit is installed on the secondary keel; the two ends of the prefabricated assembly module unit are respectively provided with a mortise and tenon, and the prefabricated assembly module units are mortise-jointed with each other through the mortise and tenon structure; the mortise is provided with a first sealing rubber; the prefabricated assembly module unit is provided with a tension hole; the joint between the prefabricated assembly module unit and the steel casing is installed with a sealing hoop and a water-expanding rubber; the side formwork installation system includes a side formwork unit, vertical tension steel bars, a first nut, a horizontal Tensile steel bars, a second nut and sealant; the bottom end of the vertical tension steel bars is inserted into the tension hole of the prefabricated assembly module unit; the side formwork unit is provided with a vertical installation hole; the side formwork unit is connected to the vertical tension steel bars through the vertical installation hole; the side formwork unit is provided with a horizontal installation hole; the horizontal tension steel bars pass through the horizontal installation hole and are fixed with the second nut; the vertical tension steel bars are fixed with the first nut; the side formwork unit is sealed with sealant; the side formwork installation system supports the side formwork unit through the supporting main beam, the side wall is provided with a first hose and a side wall conversion hole, and the bottom of the prefabricated assembly module unit is provided with a second hose and a bottom plate conversion hole.

[0011] Preferably, the guide device includes drag-reducing rubber, a supporting cross bar and a supporting diagonal bar; the supporting cross bar is detachably fixed to the inner wall of the side formwork unit, and a supporting diagonal bar is provided between the supporting cross bar and the inner wall of the side formwork unit; the free end of the supporting cross bar is connected to the steel casing via the drag-reducing rubber.

[0012] Preferably, the in-situ lifting and hanging system includes a jack, an upper hanging beam, a support beam, a corbel, a steel strand and a hanging leg; the support beam is fixed to the top of the steel casing, and the corbel fixedly connects the support beam and the steel casing; the hanging leg is fixed to the cofferdam wall panel; the upper hanging beam is located at both ends of the support beam, and a jack is provided on the upper hanging beam as the upper fixed end of the lifting system; one end of the steel strand passes through the jack fixed to the upper hanging beam, and the other end is connected to the hanging leg fixed to the cofferdam wall panel, and is used to lift and hang the steel box cofferdam.

[0013] Preferably, the casting system comprises a hopper support and a hopper; one end of the hopper support is detachably mounted on the side wall of the steel casing, and the other end is used to support the hopper; the top end of the hopper is connected to the steel strand.

[0014] The beneficial effects of the utility model are:

[0015] 1) The utility model adopts a steel casing to support the steel cofferdam bottom plate assembly system, which can realize the initial load-bearing of the bottom plate through the main keel and the secondary keel. At the same time, the prefabricated assembly module unit technology can realize the factory prefabrication of the bottom plate unit compared with the traditional technology, and the bottom plate hoisting efficiency and safety are high. The prefabricated assembly module unit is provided with an installation groove and a second sealing rubber, which can position the side formwork and improve the sealing of the connection between the side formwork and the bottom plate, so as to prevent water from seeping into the cofferdam during the cofferdam hoisting process.

[0016] 2) The bottom plate quick caulking device adopted in the utility model can achieve quick sealing of the connection between the bottom plate and the steel casing through the sealing hoop and the water-expanding rubber.

[0017] 3) The side formwork installation system adopted by the utility model adopts the prefabricated assembly module unit technology, which can realize the factory prefabrication of the bottom plate unit, and the side formwork hoisting efficiency and safety are high. At the same time, sealant is set at the connection gap of the side formwork unit to significantly improve the sealing of the side formwork.

[0018] 4) The utility model adopts vertical tension steel bars and horizontal tension steel bars, which can strengthen the vertical and horizontal fixation of the side formwork and reduce the gap at the joints of the side formwork units. At the same time, the vertical tension steel bars and the horizontal tension steel bars are detachably fixed with nuts, which are convenient to install and disassemble, and are particularly suitable for underwater disassembly construction, thereby improving construction efficiency and safety. Finally, the vertical tension steel bars also have the function of positioning the side formwork units, which can reduce the difficulty of installing the side formwork units and improve installation efficiency.

[0019] 5) The utility model adopts a first hose and a side wall conversion hole to quickly balance the difference in high water heads inside and outside, reducing the influence of buoyancy on the lowering of the steel hanging box. At the same time, the second hose and the bottom plate conversion hole used on the bottom plate allow the water on the outer bottom surface of the cofferdam to be discharged into the pre-set water storage space in the cofferdam through the second hose and the bottom plate conversion hole during the sinking of the cofferdam, so as to reduce the influence of water resistance at the bottom surface of the cofferdam on the lowering of the cofferdam.

[0020] 7) The guiding device adopted in the utility model can accurately lower the steel hanging box to the designed position. No offset adjustment is required after sinking. The utility model has simple construction, convenient installation, high positioning accuracy and fast lowering and installation speed.

[0021] 8) The utility model adopts an in-situ lifting and hanging system, and the hanging system is composed of a support beam, an upper hanging beam, and a jack. Each jack is controlled by a hydraulic synchronous control system to ensure that the lifting and lowering work is carried out synchronously and evenly.

[0022] 9) The utility model adopts a hopper bracket to temporarily support the hopper. At the same time, the top of the hopper is connected to the steel strand to realize the lowering and lifting of the hopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the top view of the steel box cofferdam bottom plate after installation;

[0024] Figure 2 Detailed drawings of prefabricated modular units;

[0025] Figure 3 Front view of the completed installation of the steel box cofferdam side plate;

[0026] Figure 4 The top view of the completed installation of the steel box cofferdam side plate;

[0027] Figure 5 Side view of the completed installation of the steel box cofferdam side plate;

[0028] Figure 6 This is the completed cross-section view of the steel box cofferdam support installation;

[0029] Figure 7 This is a top view of the completed installation of the steel box cofferdam guide device;

[0030] Figure 8 A top view of the guide device;

[0031] Fig. 9 It is a side view of the guide device;

[0032] Fig.10 This is a cross-sectional view of the installation of the in-situ lifting and lowering system of the steel hanging box cofferdam;

[0033] Fig.11This is a top view of the completed installation of the steel box cofferdam hopper;

[0034] Fig.12 Cross-sectional view of the completed installation of the steel box cofferdam hopper.

[0035] Among them: steel casing supporting steel cofferdam bottom plate assembly system 1, main keel 1-1, secondary keel 1-2, prefabricated assembly module unit 1-3, mortise and tenon 1-3-1, tenon 1-3-2, first sealing rubber 1-3-3, tension holes 1-4, joints 1-5, sealing hoop 1-6, water-expanding rubber 1-7, second sealing rubber 1-8, installation groove 1-9, side formwork installation system 2, side formwork unit 2-1, vertical tension steel bar 2-2, first nut 2-3, horizontal tension steel bar 2- 4. Second nut 2-5, sealant 2-6, supporting main beam 2-7, first hose 2-8, side wall conversion hole 2-9, second hose 2-10, bottom plate conversion hole 2-11, guide device 3, drag reduction rubber 3-1, supporting cross bar 3-2, supporting diagonal bar 3-3, in-situ lifting and hanging system 4, jack 4-1, upper hanging beam 4-2, supporting beam 4-3, corbel 4-4, steel strand 4-5, hanging leg 4-6, casting system 5, hopper bracket 5-1, hopper 5-2, steel casing 6. DETAILED DESCRIPTION

[0036] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0037] As an example, Figures 1 to 12 As shown, a complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system includes: a steel casing supporting steel cofferdam bottom plate assembly system 1, a side formwork installation system 2, a guide device 3, an in-situ lifting and hanging system 4 and a pouring system 5;

[0038] like Figure 1 and Figure 2 As shown, the steel casing supporting steel cofferdam bottom plate assembly system 1 includes a main keel 1-1, a secondary keel 1-2, and a prefabricated assembly module unit 1-3; the main keel 1-1 is installed on both sides of the steel casing 6; the secondary keel 1-2 is installed on the main keel 1-1, and the two are separated from each other without welding, so as to facilitate the disassembly and recycling of the keel; the prefabricated assembly module unit 1-3 is installed on the secondary keel 1-2; the prefabricated assembly module unit 1-3 is mortise-jointed by a mortise groove 1-3-1 and a tenon 1-3-2 structure; a first sealing rubber 1-3-3 is arranged in the mortise groove 1-3-1 to improve the sealing of the bottom plate joint 1-5;

[0039] like Figures 3 to 5 As shown, the side formwork installation system 2 includes a side formwork unit 2-1, a vertical tension steel bar 2-2, a first nut 2-3, a horizontal tension steel bar 2-4, a second nut 2-5 and a sealant 2-6; the vertical tension steel bar 2-2 is installed in the tension hole 1-4 set in the prefabricated assembly module unit 1-3; a vertical installation hole 2-8 is set on the side formwork unit 2-1; the side formwork unit 2-1 is initially positioned at the connection from bottom to top through the vertical installation hole 2-8 and the vertical tension steel bar 2-2 ; The side formwork unit 2-1 is provided with a horizontal installation hole 2-7; the horizontal tension steel bar 2-4 passes through the horizontal installation hole 2-7 and is fixed with a second nut 2-5 to achieve a horizontal sealed connection of the side formwork installation system 2; after the side formwork installation system 2 is initially assembled, the vertical tension steel bar 2-2 is fixed by the first nut 2-3 to achieve a vertical sealed connection of the side formwork installation system 2; the side formwork unit 2-1 is sealed by a sealant 2-6 to prevent external water from seeping into the cofferdam during the lowering of the cofferdam.

[0040] like Figure 6 As shown, specifically, after the preliminary assembly of the side formwork installation system 2 is completed, it is supported by the supporting main beam 2-7 to avoid excessive deformation during the in-situ lifting and lowering of the cofferdam; the side wall of the side formwork unit 2-1 is provided with a first hose 2-8 and a side wall conversion hole 2-9 to achieve rapid hydraulic balance inside and outside the cofferdam and reduce the influence of buoyancy on the lowering of the cofferdam; the bottom of the prefabricated assembly module unit 1-3 is provided with a second hose 2-10 and a bottom plate conversion hole 2-11, so that during the sinking of the cofferdam, the water on the outer bottom surface of the cofferdam is discharged into the pre-set water storage space in the cofferdam through the second hose 2-10 and the bottom plate conversion hole 2-11, so as to reduce the influence of water resistance at the bottom surface of the cofferdam on the lowering of the cofferdam.

[0041] like Figures 7 to 9 As shown, specifically, the guide device 3 includes a drag-reducing rubber 3-1, a supporting cross bar 3-2 and a supporting diagonal bar 3-3; the supporting cross bar 3-2 is detachably fixed to the inner wall of the side formwork unit 2-1, and the supporting diagonal bar 3-3 is used to improve its supporting strength; the free end of the supporting cross bar 3-2 is connected to the steel casing 6 through the drag-reducing rubber 3-1, while ensuring its guiding function, reducing its influence on the steel casing 6, and preventing the guide device 3 from damaging the surface coating of the steel casing 6 during the cofferdam hanging process.

[0042] like Fig.10As shown, specifically, the in-situ lifting and hanging system 4 includes a jack 4-1, an upper hanging beam 4-2, a support beam 4-3, a corbel 4-4, a steel strand 4-5 and a hanging leg 4-6; the support beam 4-3 is fixed to the top of the steel casing 6 and is reinforced by the corbel 4-4; the upper hanging beam 4-2 is located at both ends of the support beam 4-3, serving as the upper fixed end of the lifting system; one end of the steel strand 4-5 passes through the jack 4-1 fixed to the upper hanging beam 4-2, and the other end is connected to the hanging leg 4-6 fixed to the cofferdam wall panel, for lifting and hanging the steel box cofferdam.

[0043] like Fig.11 and Fig.12 As shown, specifically, the casting system 5 includes a hopper bracket 5-1 and a hopper 5-2; one end of the hopper bracket 5-1 is detachably mounted on the side wall of the steel casing 6, and the other end is used to support the hopper 5-2; the top end of the hopper 5-2 is connected to the steel strand 4-5 to achieve the lowering and lifting of the hopper 5-2.

Claims

1. A complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system, characterized in that: include: Steel casing supports the steel cofferdam bottom plate assembly system, side formwork installation system, guide device, in-situ lifting and hanging system and pouring system; The steel casing supporting steel cofferdam bottom plate assembly system comprises a keel and a prefabricated assembly module unit; the keel is temporarily fixed on the steel casing, and the prefabricated assembly module unit is placed on the keel; the prefabricated assembly module units are mortised to each other through mortise and tenon to form a bottom plate, and the bottom plate and the steel casing are slidably connected; The side formwork installation system includes side formwork units; vertically adjacent side formwork units are connected by vertical tension steel bars, and horizontally adjacent side formwork units are connected by horizontal tension steel bars; the bottom ends of the vertical tension steel bars are inserted into the prefabricated assembly module units; the side formwork installation system and the bottom plate form a steel hanging box cofferdam; One end of the guide device is fixed to the inner wall of the side formwork unit, and the other end is slidably connected to the steel casing; the casting system is installed between the steel casings in the steel hanging box cofferdam; the in-situ lifting and hanging system is arranged at the top of the steel casing, and the lifting and hanging of the steel hanging box cofferdam and the casting system are realized by steel strands.

2. The complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system according to claim 1 is characterized by: The steel casing supporting the steel cofferdam bottom plate assembly system includes a main keel, a secondary keel and a prefabricated assembly module unit; the main keel is installed on both sides of the steel casing; the secondary keel is installed on the main keel; the prefabricated assembly module unit is installed on the secondary keel; the two ends of the prefabricated assembly module unit are respectively provided with a mortise and tenon, and the prefabricated assembly module units are mortise-jointed with each other through the mortise and tenon structure; the mortise is provided with a first sealing rubber; the prefabricated assembly module unit is provided with tension holes; the joints between the prefabricated assembly module unit and the steel casing are provided with sealing hoops and water-expanding rubber; the side formwork installation system includes a side formwork unit, vertical tension steel bars, a first nut, and horizontal tension steel bars. Steel bars, a second nut and sealant; the bottom end of the vertical tension steel bar is inserted into the tension hole of the prefabricated assembly module unit; the side formwork unit is provided with a vertical mounting hole; the side formwork unit is connected to the vertical tension steel bar through the vertical mounting hole; the side formwork unit is provided with a horizontal mounting hole; the horizontal tension steel bar passes through the horizontal mounting hole and is fixed with a second nut; the vertical tension steel bar is fixed by the first nut; the side formwork unit is sealed by sealant; the side formwork installation system supports the side formwork unit through the supporting main beam, and the side wall is provided with a first hose and a side wall conversion hole, and the bottom of the prefabricated assembly module unit is provided with a second hose and a bottom plate conversion hole.

3. The complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system according to claim 1 is characterized by: The guide device includes drag-reducing rubber, a supporting cross bar and a supporting diagonal bar; the supporting cross bar is detachably fixed to the inner wall of the side formwork unit, and a supporting diagonal bar is provided between the supporting cross bar and the inner wall of the side formwork unit; the free end of the supporting cross bar is connected to the steel casing through the drag-reducing rubber.

4. The complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system according to claim 1 is characterized by: The in-situ lifting and hanging system includes a jack, an upper hanging beam, a support beam, a corbel, a steel strand and a hanging leg; the support beam is fixed to the top of the steel casing, and the corbel fixedly connects the support beam and the steel casing; the hanging leg is fixed to the cofferdam wall panel; the upper hanging beam is located at both ends of the support beam, and a jack is provided on the upper hanging beam as the upper fixed end of the lifting system; one end of the steel strand passes through the jack fixed to the upper hanging beam, and the other end is connected to the hanging leg fixed to the cofferdam wall panel, which is used to lift and hang the steel box cofferdam.

5. The complex deep-water riverbed steel casing suspension bottom steel hanging box cofferdam construction system according to claim 4 is characterized by: The casting system comprises a hopper support and a hopper; one end of the hopper support is detachably mounted on the side wall of the steel casing, and the other end is used to support the hopper; the top end of the hopper is connected to the steel strand.

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