CN105887893A - Variable-rigidity foundation pit support structure - Google Patents

Abstract

A foundation pit support structure with variable stiffness, comprising a first plastic plate and at least two second plastic plates, the two ends of the first plastic plate are respectively connected with one end of the corresponding second plastic plate to form a downward knuckle , the other end of the second plastic plate is connected to the remaining second plastic plate, the first plastic plate and the second plastic plate are connected to form an inverted L-shaped structure for placing in the foundation pit; the first plastic plate Both the plate and the second plastic plate are provided with a hollow structure for buffering; the entire inverted L-shaped structure is inserted into the ground of the foundation pit along the wall of the foundation pit. The beneficial effects of the present invention are mainly manifested in: by hollowing out the middle of the plastic plate, the pressure of the foundation pit on the enclosure plate can be effectively resisted, and the variability of stiffness is better utilized. As the load changes, the stiffness also changes accordingly. It has a good anti-dumping effect; there is a bolt-type connection between the boards, and the structure is much simpler, but the effect is the same. The invention is suitable for the supporting system of the foundation pit.

Description

A Foundation Pit Supporting Structure with Variable Rigidity

technical field

The invention relates to a foundation pit support structure with variable stiffness.

Background technique

The foundation pit support project is a temporary project, and the safety reserve in the design can be relatively small, but it is related to the region. Geological conditions in different regions have different characteristics. The foundation pit support is to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, and the support, reinforcement and protection measures are adopted for the side wall of the foundation pit and the surrounding environment. Common support forms include row piles, underground diaphragm walls, steel sheet piles, soil nail walls, cement retaining walls, inverted arch walls, composite structures, etc.

Publication number is that the Chinese patent of CN203891032U discloses a kind of combination structure of rotary grouting pile and miniature steel pipe pile. The new support structure includes at least one row of jet grouting piles corresponding to the upper soil layer and micro steel pipe piles formed inside the jet grouting piles. The bottom end of the pile passes through the jet grouting pile and is embedded in the rock layer below the base plane, and the top ends of the miniature steel pipe piles are connected by a crown beam. Although the composite structure has large thickness, high rigidity and strong resistance to deformation, its cost is relatively high.

The Chinese patent application whose publication number is CN202577318U discloses a foundation pit support system, comprising: a sparse row pile-soil wall nail support structure. The sparse row pile-soil wall nail support structure includes: sparse row piles and soil nail walls. The foundation pit support system described in the complaint uses the pile body of the sparse pile-soil nail wall support structure to control the deformation of the soil during the early excavation process and improve the stability of the foundation pit. Although the pile body through sparse row piles has a deeper insertion depth, higher rigidity and strength, and strengthens boundary constraints, the process is too complicated, the construction requirements are high, and the bending capacity of the material is low.

Contents of the invention

Aiming at the problems existing in the current foundation pit support, the present invention provides a kind of structure that can not only improve the rigidity, but also change with the change of the foundation pit load, has a simple structure, low cost, and is convenient for processing, construction and installation. Foundation pit support structure with variable stiffness.

A foundation pit support structure with variable stiffness according to the present invention is characterized in that it comprises a first plastic plate and at least two second plastic plates, and the two ends of the first plastic plate are connected to the corresponding second plastic plates respectively. One end of the plastic plate is connected to form a downward knuckle, the other end of the second plastic plate is connected to the remaining second plastic plate, and the first plastic plate and the second plastic plate are connected to form an inverted L for placing in the foundation pit. The first plastic plate and the second plastic plate are provided with a hollow structure for buffering; the entire inverted L-shaped structure is inserted into the ground of the foundation pit along the wall of the foundation pit.

The first plastic plate is connected to the second plastic plate, or two connected second plastic plates in a plug-in manner, and a first plastic plate is provided on one end surface and the bottom surface of the other end of the first plastic plate. A groove, one end surface of the second plastic plate is provided with a protrusion used to snap into the first groove, and the other end surface is provided with a second groove used to connect the protrusions of the adjacent second plastic plate.

The knuckle formed by the first plastic plate and the second plastic plate is 90°.

The hollow structure is an axial strip-shaped through groove.

When in use, the two ends of the first plastic plate are respectively inserted into the corresponding raised ends of the second plastic plate to form a vertical knuckle structure, and the other end of the second plastic plate is inserted into the protrusion of another second plastic plate , at this time, the number of the second plastic plates is adjusted according to the depth and size of the foundation pit, and the formed knuckle structure is attached to the bottom surface and side walls of the foundation pit, and plays the role of foundation pit support. The connection between the first plastic plate and the second plastic plate and between the second plastic plate and the second plastic plate in the present invention is not limited to the plug-in connection, but the detachable connection is all possible, and the structure of the plug-in joint is not limited to Matching of grooves and protrusions.

The beneficial effects of the present invention are mainly manifested in: by hollowing out the middle of the plastic plate, the pressure of the foundation pit on the enclosure plate can be effectively resisted, and the variability of stiffness is better utilized. As the load changes, the stiffness also changes accordingly. It has a good anti-dumping effect; there is a bolt-type connection between the boards, and the structure is much simpler, but the effect is the same. The invention is suitable for the supporting system of the foundation pit.

Description of drawings

Figure 1 is a top view of the present invention.

Figure 2 is a side view of the present invention.

Fig. 3 is a schematic diagram of installation of the present invention.

detailed description

Further illustrate the present invention below in conjunction with accompanying drawing

Referring to the attached picture:

Embodiment 1 A foundation pit support structure with variable stiffness according to the present invention includes a first plastic plate 1 and at least two second plastic plates 2, and the two ends of the first plastic plate 1 are respectively connected to the corresponding One end of the second plastic plate 2 is connected to form a downward knuckle, and the other end of the second plastic plate 2 is connected to the remaining second plastic plate 2. The first plastic plate 1 and the second plastic plate 2 are connected to form a An inverted L-shaped structure placed in the foundation pit; the first plastic plate 1 and the second plastic plate 2 are provided with a hollow structure 4 for buffering; the entire inverted L-shaped structure is inserted into the foundation pit 3 along the wall of the foundation pit ground.

The first plastic plate 1 and the second plastic plate 2, or two connected second plastic plates 2 are connected in a plug-in manner, and one end surface of the first plastic plate 1 and the bottom surface of the other end are There is a first groove 11, one end surface of the second plastic plate 2 is provided with a protrusion 21 for snapping into the first groove, and the other end surface is provided with a protrusion for connecting adjacent second plastic plates 21 of the second groove 22 .

The knuckle formed by the first plastic plate 1 and the second plastic plate 2 is 90°.

The hollow structure 4 is an axial strip-shaped through groove.

When in use, the two ends of the first plastic plate are respectively inserted into the corresponding raised ends of the second plastic plate to form a vertical knuckle structure, and the other end of the second plastic plate is inserted into the protrusion of another second plastic plate , at this time, the number of the second plastic plates is adjusted according to the depth and size of the foundation pit, and the formed knuckle structure is attached to the bottom surface and side walls of the foundation pit, and plays the role of foundation pit support.

The connected plastic boards are provided with a board-to-board connection structure, and the connection structure can be realized by adopting various structures. The connection method of this embodiment adopts a pin-type design, with a protrusion on the left and a groove on the right. This makes the connection between the board and the board more closely, increasing its integrity.

This embodiment is a foundation pit support system with variable stiffness. Through this new type of plastic plate support, it can effectively resist the pressure from the foundation pit. As the pressure changes, the stiffness also changes, which has great advantages. Good anti-dumping effect, more suitable for foundation pit support engineering.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also includes those skilled in the art. Equivalent technical means conceivable according to the concept of the present invention.

Claims (4)

1. A foundation pit support structure with variable stiffness, characterized in that: it comprises a first plastic plate and at least two second plastic plates, the two ends of the first plastic plate are respectively connected to one end of the corresponding second plastic plate The connection forms a downward knuckle, the other end of the second plastic plate is connected to the remaining second plastic plate, and the first plastic plate and the second plastic plate are connected to form an inverted L-shaped structure for placing in the foundation pit; Both the first plastic plate and the second plastic plate are provided with a hollow structure for buffering; the vertical second plastic plate of an inverted L-shaped structure is inserted into the bottom surface of the foundation pit along the wall surface of the foundation pit. 2. A foundation pit support structure with variable stiffness as claimed in claim 1, characterized in that: said first plastic plate and said second plastic plate, or two connected second plastic plates Connected by plug-in, one end surface of the first plastic plate and the bottom surface of the other end are provided with a first groove, and one end surface of the second plastic plate is provided with a protrusion for snapping into the groove, The other end surface is provided with a second groove for connecting adjacent second plastic plate protrusions. 3. A foundation pit support structure with variable stiffness according to claim 2, characterized in that: the knuckle angle formed by the first plastic plate and the second plastic plate is 90°. 4. A foundation pit support structure with variable stiffness according to claim 1, characterized in that: said hollow structure is an axial strip-shaped through groove.