Open caisson structure for silt foundation and soft soil foundation

Abstract

The invention is suitable for the field of foundation treatment construction, and provides an open caisson structure for a silt foundation and a soft soil foundation, the open caisson structure comprises an open caisson side wall, an upper cover plate and Larsen steel sheet piles are arranged on the open caisson side wall, and an anti-arch bottom plate is further arranged in the open caisson side wall. And a new scheme is provided for special foundation treatment.

Description

Technical Field

[0001] The invention relates to the field of foundation treatment construction, in particular to a caisson structure used for silt foundation and soft soil foundation. Background Art

[0002] In construction projects, foundation treatment is a key step to ensure the stability and safety of buildings. Especially in the case of silt and soft soil foundations, the bearing capacity of the foundation is low, and settlement and deformation are prone to occur, which brings hidden dangers to the long-term use of the building. Therefore, the treatment method for this type of special foundation has always been the research focus in the engineering field.

[0003] In the prior art, the traditional treatment methods for silt and soft soil foundation are:

[0004] (1) The depth of the unfavorable stratum is shallow and can be completely excavated and replaced by replacement method;

[0005] (2) h<5m, use sand piles or lime piles to improve the bearing capacity of the foundation;

[0006] (3) 5m<h<7m, using precast piles driven into the hard soil layer and then combined with a concrete cap as the building base;

[0007] (4) 7m<h<10m, using cast-in-place pile foundation to improve the bearing capacity of the foundation;

[0008] (5) h>10m, friction pile foundation is used to improve the bearing capacity of the foundation;

[0009] When the depth of the bad stratum is large, it will lead to the disadvantages of complicated construction, great construction difficulty and high cost. Therefore, in view of the above situation, it is urgent to provide a caisson structure for silt foundation and soft soil foundation to overcome the shortcomings in current practical applications. Summary of the invention

[0010] The object of the present invention is to provide a caisson structure for muddy foundation and soft soil foundation, aiming to solve the problems in the above-mentioned background technology.

[0011] The present invention is implemented in this way: a caisson structure for muddy foundation and soft soil foundation includes a caisson side wall, an upper cover plate and Larsen steel sheet piles are arranged on the caisson side wall, and an anti-arch bottom plate is also arranged inside the caisson side wall.

[0012] As a further solution of the present invention: a reserved inverted arch bottom plate groove for placing the inverted arch bottom plate is opened on the side wall of the caisson.

[0013] As a further solution of the present invention: an internal cavity is formed between the caisson side wall, the inverted arch bottom plate and the upper cover plate.

[0014] As a further solution of the present invention: reserved steel sheet pile slots for accommodating Larsen steel sheet piles are provided on the side walls and the upper cover plate of the caisson.

[0015] As a further solution of the present invention: the cross-section of the caisson structure is rectangular, and the four corners are provided with arc chamfers.

[0016] As a further solution of the present invention: a plurality of Larsen steel sheet piles are provided.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the upper cover plate also serves as the floor of the building, and the depth of the empty box, that is, the depth of the caisson structure, is determined according to the mass of the upper building; the length and width of the caisson structure are determined according to the outer contour of the building; the caisson structure is firstly manufactured by a ground prefabrication method, and then excavation and sinking construction is carried out to sink the caisson to the designed elevation; then the caisson inverted arch bottom plate and the upper cover plate are cast; the caisson structure for silt foundation and soft soil foundation provided by the present invention effectively improves construction efficiency, reduces construction difficulty, and provides a new solution for special foundation treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] In the attached drawings: 1-caisson side wall, 2-anti-arch bottom plate, 3-internal cavity, 4-upper cover plate, 5-Larsen steel sheet pile, 6-reserved anti-arch bottom plate groove, 7-reserved steel sheet pile slot hole. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0024] The present invention is further explained below in conjunction with specific implementation modes.

[0025] See also Figure 1 , an embodiment of the present invention provides a caisson structure for a muddy foundation and a soft soil foundation, the caisson structure for a muddy foundation and a soft soil foundation comprises a caisson side wall 1, an upper cover plate 4 and a Larsen steel sheet pile 5 are arranged on the caisson side wall 1, and an anti-arch bottom plate 2 is also arranged inside the caisson side wall 1;

[0026] The side wall 1 of the caisson is provided with a reserved arch bottom plate groove 6 for placing the arch bottom plate 2;

[0027] An internal cavity 3 is formed between the caisson side wall 1, the anti-arch bottom plate 2 and the upper cover plate 4;

[0028] The side wall 1 and the upper cover plate 4 of the caisson are both provided with reserved steel sheet pile slots 7 for accommodating Larsen steel sheet piles 5; a plurality of Larsen steel sheet piles 5 are provided;

[0029] The cross-section of the caisson structure is rectangular, and four corners are provided with arc chamfers.

[0030] In an embodiment of the present invention, the upper cover plate 4 also serves as the floor of the building. The depth of the empty box, that is, the depth of the caisson structure, is determined according to the mass of the upper building; the length and width of the caisson structure are determined according to the outer contour of the building; the caisson structure is firstly manufactured by a ground prefabrication method, and then excavation and sinking construction is carried out to sink the caisson to the designed elevation; then the caisson anti-arch bottom plate 2 and the upper cover plate 4 are cast; compared with the prior art, the caisson structure for silt foundation and soft soil foundation provided by the present invention effectively improves construction efficiency, reduces construction difficulty, and provides a new solution for special foundation treatment.

[0031] In one embodiment of the present invention, see Figure 1 The caisson structure for muddy foundation and soft soil foundation is used for foundation treatment. The specific operation is implemented by the following steps:

[0032] (1) Determine the size of the caisson. The "length × width" of the caisson structure is determined according to the outline of the building. The depth of the empty box is determined according to the mass of the upper building. The basic cross-section of the caisson structure is a rectangle, and the four corners are chamfered to facilitate tilt control during construction and relatively convenient excavation of the bottom of the well;

[0033] (2) Using the ground prefabrication method to make the caisson;

[0034] (3) Carry out excavation and sinking construction, and sink the caisson to the designed elevation;

[0035] (4) Casting the caisson anti-arch bottom plate 2 to offset the foundation reaction force and the deadweight of the upper building and transfer part of the load to the caisson wall 1;

[0036] (5) Cast the upper cover plate 4 and the upper building.

[0037] Finally, it should be noted that 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A caisson structure for use in a muddy foundation or a soft soil foundation, comprising a caisson side wall (1), characterized in that: An upper cover plate (4) and Larsen steel sheet piles (5) are arranged on the caisson side wall (1), and an inverted arch bottom plate (2) is also arranged inside the caisson side wall (1).

2. The caisson structure for muddy foundation and soft soil foundation according to claim 1 is characterized in that: A reserved inverted arch bottom plate groove (6) for placing the inverted arch bottom plate (2) is provided on the side wall (1) of the caisson.

3. The caisson structure for muddy foundation and soft soil foundation according to claim 2 is characterized in that: An internal cavity (3) is formed between the caisson side wall (1), the inverted arch bottom plate (2) and the upper cover plate (4).

4. The caisson structure for muddy foundation and soft soil foundation according to claim 1, characterized in that: The side wall (1) and the upper cover plate (4) of the caisson are both provided with reserved steel sheet pile slots (7) for accommodating Larsen steel sheet piles (5).

5. The caisson structure for muddy foundation and soft soil foundation according to claim 1, characterized in that: The cross-section of the caisson structure is rectangular, and four corners are provided with arc chamfers.

6. The caisson structure for muddy foundation and soft soil foundation according to claim 1, characterized in that: A plurality of Larsen steel sheet piles (5) are provided.

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