CN101666101A - Movable prefabricated multi-barrel type gravity mixed foundation - Google Patents

Abstract

The invention discloses a movable prefabricated multi-cylindrical gravity hybrid foundation, which comprises a plurality of cylindrical foundations arranged axially in parallel and coplanar with the upper surface of the cylinder cover, and each cylindrical foundation is coaxially fixed through the cylinder cover above it There is an upper cylindrical structure with an opening facing upwards, and the upper cylindrical structure is connected by a connection bottom plate and a rib plate that are integrally connected with the cylinder covers of the plurality of cylindrical foundations, and the bottom surface of the connection bottom plate is connected to the cylinder The bottom surface of the cylinder cover of the foundation is coplanar, and the base platform at the center of the mixed foundation is arranged on the connecting bottom plate, and the cylinder of each upper cylinder structure is filled with heavy objects, and the cylinder of the cylinder foundation The cover is provided with a switchable reserved through hole. The invention does not require a large transport ship for transportation, and does not require a large hoisting ship for on-site installation; the positioning sinking equipment is simple, the construction is simple, the sinking speed is fast, the deflection is easy to control, and the vacuum preloading and heavy object filling preload the foundation reinforcement. The effect is outstanding, and the comprehensive engineering cost is low.

Description

Movable prefabricated multi-tube gravity mixed foundation

technical field

The invention relates to a foundation in port, ocean, water conservancy and bridge engineering, in particular to a movable prefabricated multi-tube gravity mixed foundation.

Background technique

At present, in port, marine, water conservancy and bridge projects, the foundations on soft soil foundations are mainly pile foundations, which require complex construction equipment, high costs, and high requirements for natural conditions. When the environmental loads such as wind, wave and current are complex, especially in river courses, estuaries and sea areas with high tidal currents, the requirements for displacement and positioning of piling equipment are very high, and the piling efficiency is relatively low. At the same time, on the muddy soft soil foundation, the design depth of the pile will increase, and the cost will also increase immediately.

Contents of the invention

In order to solve the technical problems existing in the known technology, the present invention provides a movable prefabricated multi-tube gravity mixed foundation suitable for soft ground. The mixed foundation has the advantages of good durability and high bearing capacity of traditional pile foundations. At the same time, it has the characteristics of simple construction and relatively low construction cost.

The technical solution adopted by the present invention to solve the technical problems in the known technology is: a movable prefabricated multi-tube gravity hybrid foundation, including a plurality of cylindrical foundations arranged in parallel axially and coplanar on the top of the cylinder cover. Each of the cylindrical foundations is coaxially fixed with an upper cylindrical structure with the opening facing upward through the upper cylindrical structure, and the upper cylindrical structure is integrated with the cylindrical covers of the plurality of cylindrical foundations. The connecting bottom plate is connected to the rib plate, the bottom surface of the connecting bottom plate is coplanar with the bottom surface of the cylinder cover of the cylindrical foundation, and the foundation platform at the center of the mixed foundation is arranged on the connecting bottom plate, and each upper part The cylinder of the cylinder structure is filled with heavy objects, and the cylinder cover of the cylinder foundation is provided with a switchable reserved through hole.

The cylindrical foundation is a steel structure or a concrete structure or a steel-concrete structure, the cylinder cover of the cylindrical foundation is a steel structure or a concrete structure or a steel-concrete structure, and the upper cylindrical structure is the same as the cylindrical foundation A steel structure or a concrete structure or a steel-concrete structure integrated with the cover of the cylindrical foundation, and the connecting bottom plate and ribs are a steel structure or a concrete structure or a steel-concrete structure integrated with the cover of the cylindrical foundation.

The advantages and positive effects of the present invention are: it is suitable for use as the foundation of structures on soft ground; the transportation of the mixed foundation does not require large transport ships, and the installation on site does not require large lifting ships; the mixed foundation has the durability of traditional pile foundations. At the same time, the hybrid foundation has simple positioning and sinking equipment, simple construction, fast sinking speed, easy control of deflection, and the preloading effect of vacuum preloading and heavy filling on foundation reinforcement is outstanding. , The comprehensive project cost is low.

Description of drawings

Fig. 1 is a cross-sectional structure schematic diagram of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the bottom view of Fig. 1;

Fig. 4 is a schematic diagram of the contact between the underside of the cylinder top plate and the foundation surface of the present invention and the vacuum preloading under the cylinder-type foundation cylinder cover and under the connecting bottom plate after the sinking of the present invention is installed in place;

Fig. 5 is a schematic diagram of the underside of the cylinder-shaped foundation cylinder cover and the connection bottom plate after the present invention is sunken and installed in place, that is, the underside of the cylinder top plate of the present invention is in contact with the foundation surface and vacuum preloaded and filled with heavy objects.

In the figure: 1. Cylindrical foundation, 2. Upper cylindrical structure, 3. Reserved through hole, 4. Rib plate, 5. Connecting bottom plate, 6. Cylindrical cover, 7. Foundation cap, 8. Water and/or Air, 9, heavy objects.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Figures 1 to 5, a movable prefabricated multi-tube gravity hybrid foundation of the present invention, including a plurality of steel cylindrical foundations 1 capable of air buoyancy and negative pressure sinking, and an integral upper foundation connected thereto Bearing platform 7, multiple cylindrical foundations 1 are axially arranged in parallel, and the top of the cylinder cover is coplanar; the upper part of the cylinder cover 6 of each cylindrical foundation 1 is provided with a switchable reserved through hole 3; each cylindrical foundation 1 The upper part of the cylinder cover 6 is coaxially fixed to the upper cylindrical structure 2 with the opening facing upwards, and the multiple upper cylindrical structures 2 are connected by the bottom plate 5 and the rib plate 4, connecting the bottom surface of the bottom plate 5 and the bottom surface of the cylinder cover of the cylindrical foundation 1 Coplanar, the connecting bottom plate 5 and the cylinder cover 6 of the cylinder foundation 1 are fixedly integrated; the upper foundation platform 7 is located at the center of the hybrid foundation. After the mixed foundation is floated to the predetermined position, it sinks under negative pressure through the reserved through hole 3. After sinking to the design depth, the water and/or air 8 in the cylindrical foundation 1 are continuously pumped out for vacuum preloading to enhance the softness. For the reinforcement depth of the foundation, the filling work of heavy objects 9 such as sand and stones in the multiple upper cylindrical structures 2 is carried out at the same time, to further strengthen the super-consolidation process of the foundation, thereby improving the bearing capacity of the foundation soil.

In this embodiment, the single air pontoon foundation is a steel cylinder foundation with a diameter of 15m, a height of 5m, and a wall thickness of 25mm. The cylinder cover is a steel-concrete composite circular plate with a diameter of 15m. The thickness of the steel plate is 25mm, and the thickness of the concrete plate is 500mm. , the upper cylindrical structure on the steel cylindrical foundation is a concrete structure poured together with the steel-concrete hybrid structure of the steel cylindrical foundation, with a diameter of 15m, a height of 5m, a wall thickness of 500mm, and a cylinder spacing of 25m. The connecting bottom plate and ribs between the upper cylindrical structures are concrete structures poured together with the steel-concrete hybrid structure cover of the steel cylindrical foundation. The high tide water level is about 5-6m deep.

After the above-mentioned hybrid foundation structure is prefabricated on land, it is moved into the water using skids or submersible barges. Before the structure is launched, the inflation and exhaust valves and pipelines are connected to the reserved through holes on the cover of the 4 steel cylindrical foundations of the mixed foundation, and a pumping/exhausting valve is installed on each of the 4 reserved through holes. air pump.

After the mixed foundation is installed in place, the water/air pumps on the cover of each cylindrical foundation continue to work to carry out vacuum preloading of the foundation and strengthen the foundation. In order to ensure the effect of vacuum preloading, each cylindrical Geotextiles of different thicknesses are laid under the foundation cylinder cover to ensure the uniformity of vacuum preloading, as shown in Figure 4. At the same time, heavy objects such as sand and stones are filled in the upper concrete cylindrical structure to complete the preloading work of the mixed foundation, as shown in Figure 5.

The above-mentioned cylindrical foundation is not limited to a steel structure and may also be a concrete structure or a steel-concrete structure. The upper cylindrical structure above the cylindrical foundation is not limited to a concrete structure, but may be a concrete structure or a steel-concrete structure. The cylinder cover, reinforcing ribs and foundation caps can be deduced by analogy.

Due to the characteristics of self-floating and supporting navigation, the present invention does not require large-scale transport ships, and does not require large-scale lifting ships for on-site installation. The hauling and positioning equipment is simple, the construction is simple, the sinking speed is fast, the deflection is easy to control, and the comprehensive construction low cost. Simultaneously, it adopts vacuum and heavy object filling pre-compression technology, which further guarantees the stability and safety of the present invention. In areas with complex environmental loads and unfavorable geological conditions, the foundation needs to have an efficient and cost-effective construction method and a good bearing capacity. The invention solves the above problems and makes up for the shortcomings of the traditional pile foundation. It is a hybrid foundation structure made of steel and concrete, based on a cylindrical structure, and the upper part is a concrete cap structure.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection scope of the present invention.

Claims (2)

1. A movable prefabricated multi-tube gravity hybrid foundation, characterized in that it includes a plurality of cylindrical foundations arranged in parallel axially and coplanar on the top of the cylinder cover, and each of the cylindrical foundations passes through the cylinder cover above it The upper cylindrical structure with the opening facing upwards is coaxially fixed, and the upper cylindrical structure is connected by a connecting bottom plate and a rib plate that are integrally fixed with the cylinder covers of the plurality of cylindrical foundations, and the connecting bottom plate The bottom surface of the cylindrical foundation is coplanar with the bottom surface of the cylinder cover of the cylindrical foundation, and the foundation platform at the center of the mixed foundation is arranged on the connecting bottom plate, and the cylinder of each upper cylindrical structure is filled with heavy objects, so The cover of the cylindrical foundation is provided with a switchable reserved through hole. 2. The movable prefabricated multi-tube gravity mixed foundation according to claim 1, wherein the cylindrical foundation is a steel structure or a concrete structure or a steel concrete structure, and the cover of the cylindrical foundation is a steel structure. structure or concrete structure or steel concrete structure, the upper cylindrical structure is a steel structure or concrete structure or steel concrete structure integrated with the cylinder cover of the cylindrical foundation, and the connecting bottom plate and ribs are connected with the The cylinder cover of the cylinder foundation is connected into a steel structure or concrete structure or steel concrete structure.

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