CN108999204A - A kind of skirt-type adds partition diaphram wall-stake composite type base - Google Patents

Abstract

The invention belongs to industrial building, power plant construction and bridge tunel engineering technical fields, it is related to a kind of skirt-type and adds partition diaphram wall-stake composite type base, is mainly made of main diaphram wall, interior vertical clapboard, bearing sheet, skirt-type diaphram wall, outer vertical clapboard and stake.Main diaphram wall and skirt-type diaphram wall are back that font structure, skirt-type diaphram wall cover on the top of main diaphram wall；Multiple interior vertical clapboards form two symmetrical triangle spaces inside main diaphram wall；More piles are evenly arranged in inside main diaphram wall；Skirt-type diaphram wall, main diaphram wall and stake three are connected to become overall structure by bearing sheet, and three's synergistic effect increases the overall stiffness of composite type base；Outer vertical clapboard is for connecting skirt-type diaphram wall inside and main diaphram wall.Overall structure reasonable stress of the invention, has a wide range of application at cost saving, can be applied to the fields such as industrial building, power plant construction, wind-power electricity generation and bridge tunel engineering.

Description

A kind of skirt-type underground diaphragm wall-pile composite foundation

technical field

The invention belongs to the technical fields of industrial buildings, power plant construction and bridge-tunnel engineering, and relates to a structural form of a composite foundation, in particular to a skirt-type underground diaphragm wall-pile composite foundation with partitions.

Background technique

With the development of society and the increasing number of large-scale projects at home and abroad, industrial buildings, power plant buildings, bridge and tunnel engineering and other fields are facing more and more situations that need to resist large horizontal bearing capacity, horizontal loads (such as ship loads, wave loads, etc.) Force, water flow force, wind load, etc.) become its control load in the foundation design. In recent years, it is not uncommon for the foundation of structures to be damaged due to large horizontal loads. Most of the traditional solutions adopt the form of pile foundation, underground diaphragm wall, caisson, suction barrel foundation, etc.; although the pile group foundation has a large vertical bearing capacity, its ability to resist horizontal load is insufficient; the overall use of underground diaphragm wall, The cost of the caisson foundation is too high; the rigidity of the conventional suction barrel is small, and the deflection deformation is large under the action of the horizontal load. As a form of shallow foundation, its own stability is insufficient.

The Chinese utility model patent "submarine skirt suction anchor" (CN 201581410 U) and the Chinese invention patent "submarine suction anchor" (200910019282.9) disclose a submarine skirt suction anchor, which includes a barrel with an open bottom and a closed top. There is a drainage hole on the top surface of the barrel, and there is a ring-shaped reinforcing plate on the outer side of the upper end of the barrel. The ring-shaped reinforcing plate and the barrel together form an overall structure with a T-shaped longitudinal section; this suction foundation can solve the problem of existing suction foundations. The bearing capacity is small, but it mainly involves the foundation of offshore wind power projects. The Chinese utility model patent "A Suction Bucket-Pile Composite Foundation" (CN 202273241 U) discloses a suction bucket-pile composite foundation, which includes a suction bucket and piles. The barrel cover is provided with through holes, and the piles run through the entire suction barrel from top to bottom, and the piles are fixedly connected to the barrel cover; this composite foundation can improve the ability to resist horizontal and overturning, but the single pile and single barrel Formal economic costs are too high. The Chinese invention patent "Horizontal load-bearing composite foundation and method based on piles and underground diaphragm walls" (CN 105756075 A) discloses a horizontal load-bearing composite foundation of piles and underground diaphragm walls, which includes underground diaphragm walls and multiple Horizontal load-bearing piles; while taking advantage of the advantages of large horizontal rigidity of the underground diaphragm wall, it ensures the embedding of the foundation at the same time, but the connection point between the underground diaphragm wall and the pile will cause the problem of stress concentration.

Aiming at the defects of the existing foundation forms resisting horizontal loads, through the analysis of the internal force and deformation of traditional pile foundations, underground diaphragm wall foundations, caisson foundations and suction bucket foundations under horizontal loads, it is found that the general horizontal force members The overall performance is characterized by large bending moment and deformation in the middle and upper parts, and small bending moment and deformation in the lower part. Therefore, it is necessary to reasonably and economically improve the horizontal bearing capacity of the foundation and reduce deflection deformation, so the design scheme must conform to the location of large deformation. A new concept of variable stiffness design that increases stiffness to reduce deformation, and where the deformation is small, reduces stiffness to save costs. For this reason, the present invention proposes a novel foundation form—skirt type plus diaphragm underground diaphragm wall-pile composite foundation.

Contents of the invention

In order to solve the above problems, the present invention provides a skirt-type diaphragm wall-pile composite foundation with high horizontal bearing capacity, high overall rigidity and significant resistance to deflection deformation.

Technical scheme of the present invention:

A skirt-type underground diaphragm wall-pile composite foundation, mainly composed of a main underground diaphragm wall 1, an inner vertical diaphragm 2, a cap plate 3, a skirt-type underground diaphragm wall 4, an outer vertical diaphragm 5 and Pile 6 composition;

The main underground diaphragm wall 1 and the skirt type underground diaphragm wall 4 are both back-shaped structures, and the skirt type underground diaphragm wall 4 is set on the upper part of the main underground diaphragm wall 1; the inner vertical partition 2 is located in the main underground Inside the diaphragm wall 1, a plurality of inner vertical partitions 2 divide the interior of the main underground diaphragm wall 1 into a plurality of independent spaces; the piles 6 are multiple, and are evenly arranged in the independent spaces inside the main underground diaphragm wall 1 ; The skirt type underground diaphragm wall 4, the main underground diaphragm wall 1 and the pile 6, the upper parts of the three are connected to form an integral structure through the cap plate 3, and the three cooperate to increase the overall rigidity of the composite foundation; The outer vertical partition 5 is located between the skirt type underground diaphragm wall 4 and the main underground diaphragm wall 1 for connecting the skirt type underground diaphragm wall 4 and the main underground diaphragm wall 1 .

A buckle 7 is provided between the pile 6 and the lower surface of the cap plate 3, and the pile 6 and the cap plate 3 are fixedly connected to make the connection more stable and reliable.

The pile 6 is a variable section pile, and the diameter ratio of the upper pile to the lower pile is 2:1.

The piles 6 are in the form of vertical piles, inclined piles or cross distribution, and are made of steel pipe piles or prefabricated reinforced concrete piles.

The main underground diaphragm wall 1 and the skirt type underground diaphragm wall 4 have a wall thickness ratio of 8:5 and an aspect ratio of 1:2; the height of the skirt type underground diaphragm wall 4 is the main underground diaphragm wall 1 1/3 of.

Both the outer vertical partition 5 and the inner vertical partition 2 are made of steel plates, and the thickness ratio of the two is 5:4.

The thickness of the platform plate 3 is 200mm.

A skirt-type underground diaphragm wall-pile composite foundation with partitions, the construction method when used is as follows:

1) First, according to the design layout, carry out hanging piles, inserting piles, sinking by hammering, and connecting piles, and apply the pile 6 to the designated position;

2) After the maintenance of the pile 6 is completed, the construction of the main underground diaphragm wall 1 is carried out: construction of the guide wall, excavation of the groove section, fabrication and hoisting of the reinforcement cage, pouring of concrete, and embedding of embedded parts at designated positions;

3) Construction of skirt-type underground diaphragm wall 4: construction of guide wall, excavation of groove section, manufacture and hoisting of steel cage, pouring concrete, and embedding embedded parts at designated positions;

4) Install and weld the inner vertical partition 2 and the outer vertical partition 5 through the skirt type underground diaphragm wall 4 and the embedded parts inside the main underground diaphragm wall 1;

5) backfill and compact the soil;

6) Construction of the bearing plate 3: fabrication of the reinforcement cage, welding of the buckle 7, binding and fixing the fabricated reinforcement cage with the elongated steel bars of the skirt type underground diaphragm wall 4, the main underground diaphragm wall 1, and the pile 6 Connection processing, pouring concrete.

The present invention has the effect: the general horizontal force-bearing members generally have the characteristics of large bending moment and deformation in the middle and upper parts, and small bending moment and deformation in the lower part. Therefore, it is necessary to reasonably and economically improve the horizontal bearing capacity of the foundation and reduce the bending deformation, so the scheme should conform to the position where the deformation is large, increase the stiffness to reduce the deformation, and reduce the stiffness to save costs at the place where the deformation is small; the invention adopts the concept of variable stiffness, and the setting of "skirt" and "baffle" not only increases the foundation The contact area with the soil also increases the bending stiffness and shear stiffness of the foundation to prevent buckling of the underground diaphragm wall structure; the setting of "pile" not only improves the overall stiffness of the foundation, but also plays a role of embedding; In addition, the variable cross-section of the "pile" not only conforms to the design concept of variable stiffness, but also saves costs. The combination of underground diaphragm wall, skirt structure and piles makes the horizontal bearing capacity of the foundation more significant. The overall structure of the invention has reasonable stress, low cost and wide application range, and can be used as the basis of various structures such as industrial buildings, power plant construction, bridge engineering, offshore engineering, and wind power generation.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a horizontal sectional schematic diagram of Fig. 1;

Fig. 3 is a layout diagram of buckle positions in Fig. 1 .

In the figure: 1 main underground diaphragm wall; 2 inner vertical partition; 3 bearing platform; 4 skirt type underground diaphragm wall; 5 outer vertical partition; 6 variable-section pile; 7 buckle.

Detailed ways

The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

A kind of skirt-type underground diaphragm wall-pile composite foundation, as shown in Figure 1 and Figure 2, the materials selected in the present invention are steel plates and concrete materials, mainly including the main underground diaphragm wall 1, cap plate 3, skirt Formula structure 4 and pile 6 constitute. And the main underground diaphragm wall 1 is connected with the skirt type underground diaphragm wall 4 through the external vertical partition 5, and the main underground diaphragm wall 1 divides the internal space into several independent small spaces through the internal vertical partition 2, and three variable-section piles 6 is filled in the independent small space, and the main underground diaphragm wall 1, skirt-type underground diaphragm wall 4 and piles 6 connect the three into an integral structure through the cap plate 3.

In order to better make the form of the composite foundation more stable, buckles 7 are provided at the connection between the pile 6 and the cap plate 3, and the angle between each two buckles is 120 degrees. The location layout of the buckle 7 is shown in FIG. 3 .

The skirt type plus partition underground diaphragm wall-pile composite foundation of the present invention adopts the following steps to implement:

Firstly, three piles 6 (vertical piles or inclined piles) are constructed on the ground, and then guide grooves are excavated on the upper soil body. The guide grooves are excavated vertically, so as to ensure that the soil interacts with the composite foundation to produce resistance, and at the same time, the steel bars are bound. The embedded parts are preset in the cage, and the main underground diaphragm wall 1 is constructed; the guide groove is excavated on the outer upper end soil of the main underground diaphragm wall 1, and the skirt type underground diaphragm wall 4 is constructed; the skirt type underground diaphragm wall 4 is constructed. Excavate the soil between the main underground diaphragm wall 1 and the interior of the main underground diaphragm wall 1, then weld the inner vertical partition 2 and the outer vertical partition 5, and backfill and compact the excavated soil. The reinforcement cage and buckle of the platform 3 are prefabricated, and finally the platform 3 is constructed.

Claims (8)

1. a kind of skirt-type adds partition diaphram wall-stake composite type base, which is characterized in that the composite type base mainly by Main diaphram wall (1), interior vertical clapboard (2), bearing sheet (3), skirt-type diaphram wall (4), outer vertical clapboard (5) and stake (6) it forms；

The main diaphram wall (1) and skirt-type diaphram wall (4) is back font structure, skirt-type diaphram wall (4) Cover the top in main diaphram wall (1)；The interior vertical clapboard (2) is located at the inside of main diaphram wall (1), multiple interior Vertical clapboard (2) will be divided into multiple separate spaces inside main diaphram wall (1)；The stake (6) has more, is evenly arranged In the internal separate space of main diaphram wall (1)；Skirt-type diaphram wall (4), main diaphram wall (1) and the stake (6), the top of three is connected to become an overall structure by bearing sheet (3), and three's synergistic effect increases composite type base Overall stiffness；The outer vertical clapboard (5) is located between skirt-type diaphram wall (4) and main diaphram wall (1), for connecting Connect skirt-type diaphram wall (4) and main diaphram wall (1).

2. a kind of skirt-type according to claim 1 adds partition diaphram wall-stake composite type base, which is characterized in that institute It is equipped with buckle (7) between the stake (6) stated and the lower surface of bearing sheet (3), stake (6) and bearing sheet (3) are fixedly connected, made It is more stable firm to connect.

3. a kind of skirt-type according to claim 1 or 2 adds partition diaphram wall-stake composite type base, which is characterized in that The stake (6) is non-uniform pile, and top stake is 2:1 with lower part stake diameter ratio.

4. a kind of skirt-type according to claim 1 or 2 adds partition diaphram wall-stake composite type base, which is characterized in that The wall thickness ratio of the main diaphram wall (1) and skirt-type diaphram wall (4), the two is 8:5, and length-width ratio is 1:2；Skirt-type The height of diaphram wall (4) is the 1/3 of main diaphram wall (1).

5. a kind of skirt-type according to claim 3 adds partition diaphram wall-stake composite type base, which is characterized in that institute The wall thickness ratio of the main diaphram wall (1) and skirt-type diaphram wall (4) stated, the two is 8:5, and length-width ratio is 1:2；Skirt-type The height of lower diaphragm wall (4) is the 1/3 of main diaphram wall (1).

6. according to claim 1, a kind of skirt-type described in 2 or 5 adds partition diaphram wall-stake composite type base, feature exists In the outer vertical clapboard (5) and interior vertical clapboard (2) are all made of steel plate, and the thickness ratio of the two is 5:4；The cushion cap Plate (3) with a thickness of 200mm.

7. a kind of skirt-type according to claim 3 adds partition diaphram wall-stake composite type base, which is characterized in that institute The outer vertical clapboard (5) and interior vertical clapboard (2) stated are all made of steel plate, and the thickness ratio of the two is 5:4；The bearing sheet (3) With a thickness of 200mm.

8. a kind of skirt-type according to claim 4 adds partition diaphram wall-stake composite type base, which is characterized in that institute The outer vertical clapboard (5) and interior vertical clapboard (2) stated are all made of steel plate, and the thickness ratio of the two is 5:4；The bearing sheet (3) With a thickness of 200mm.