Fabricated steel pipe inner supporting piece for deep foundation pit engineering

Abstract

The utility model discloses an assembly type steel pipe inner supporting piece for deep foundation pit engineering, which comprises a supporting rod, the supporting rod is formed by sequentially splicing a plurality of section steel pipes, the section steel pipes comprise one or two of standard section steel pipes and short connection section steel pipes, and special-shaped adjustable joints are spliced at two ends of the supporting rod. The special-shaped adjustable node is limited and propped against the tray, and the tray is fixed on a supporting point on the inner side of a foundation pit; according to the scheme, the fabricated steel pipe inner supporting piece is of a fabricated type, can be constructed on site and is convenient to disassemble and assemble, meanwhile, the standard section steel pipe and the short connection section steel pipe can be selected and matched according to the actual requirement for the width of the foundation pit so as to support the foundation pits with different widths, meanwhile, a middle stand column does not need to be arranged in the scheme, and a larger operation space is provided for foundation pit excavation; meanwhile, a combined supporting mode of the special-shaped adjustable joints and the steel pipes is adopted, the rigidity is large, the stress performance is good, and sufficient bearing capacity and overall stability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of structural support, in particular to an assembled steel pipe inner support member used in deep foundation pit engineering. Background Art

[0002] With the increasing number of foundation pit projects, dark tunnels and pits, bridges and construction projects, it is urgent to solve the problems of poor integrity, weak bearing capacity, insufficient rigidity and stability of prefabricated steel supports. Therefore, the detachable adjustment points of prefabricated steel supports need to study the use of new structures to enhance bearing capacity and rigidity and ensure stability and integrity. Foundation pit excavation requires timely and effective support, and the requirements for foundation pit deformation control are becoming more and more stringent.

[0003] The most commonly used support and support projects in deep foundation pits are round steel pipe supports and cast-in-place reinforced concrete supports. The existing steel pipe supports often have low rigidity and small horizontal spacing between supports, resulting in limited space for mechanical construction operations. Once over-excavated, it often causes serious deformation of the retaining structure and foundation settlement, and the steel is prone to rust, resulting in waste. Cast-in-place reinforced concrete supports require steel bar binding, concrete pouring and maintenance at the construction site, and the construction period is long. They are difficult to dismantle and will generate vibration, noise and dust, polluting the environment, and are also prone to causing a large amount of material waste. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides an assembled steel pipe inner support member for deep foundation pit engineering, which solves the problems of limited rigidity and horizontal support spacing of the existing inner support members.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] Provided is an assembled steel pipe inner support for deep foundation pit engineering, comprising a support rod, which is formed by sequentially splicing together a number of steel pipe sections, wherein the steel pipe sections include one or both of standard section steel pipes and short-circuit section steel pipes, and both ends of the support rod are spliced ​​with special-shaped flexible nodes, which are limitedly abutted against a pallet, and the pallet is fixed on a supporting point on the inner side of the foundation pit.

[0007] Furthermore, the special-shaped flexible node includes a first circular steel plate, which is fixedly connected to the second circular steel plate through a plurality of first steel sleeves of different sizes, and the plurality of first steel sleeves are coaxially nested; the second circular steel plate is fixedly connected to the flange through a plurality of second steel sleeves of different sizes, and the plurality of second steel sleeves are coaxially nested.

[0008] Furthermore, the axes of the first steel sleeves coincide with the axes of the second steel sleeves, and the radial dimensions of the first steel sleeves correspond to the radial dimensions of the second steel sleeves.

[0009] Furthermore, a plurality of stiffening ribs are arranged on the outer edge of the steel sleeve located between the second circular steel plate and the flange.

[0010] Furthermore, a triangular support frame is provided at the bottom of the pallet, and the triangular support frame and the pallet are welded to the embedded steel plate inside the foundation pit.

[0011] Furthermore, both ends of the standard section steel pipe and the short section steel pipe are provided with flanges for easy splicing.

[0012] Furthermore, the assembled steel pipe inner support is made of Q420-B steel.

[0013] The beneficial effects of the utility model are:

[0014] The prefabricated steel pipe internal support of this scheme is prefabricated, can be constructed on site, and is easy to disassemble and assemble. At the same time, the standard section steel pipe and the short section steel pipe can be selected and matched according to the actual requirements of the foundation pit width to achieve support for foundation pits of different widths. At the same time, this scheme does not require the setting of a neutral column, providing a larger working space for foundation pit excavation; this scheme adopts a combined support form of special-shaped flexible nodes and steel pipes, which has high rigidity, good force performance, sufficient bearing capacity and overall stability, and can be used in situations where the support axial force is large. At the same time, the special-shaped flexible nodes make the overall support force more clear and concentrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the prefabricated steel pipe inner support in this scheme.

[0016] Figure 2 It is a schematic diagram of the structure of a special-shaped active node.

[0017] Figure 3 This is a cross-sectional view of a special-shaped flexible node.

[0018] Among them, 1. standard section steel pipe, 2. short section steel pipe, 3. tray, 4. first circular steel plate, 5. first steel sleeve, 6. second circular steel plate, 7. second steel sleeve, 8. flange, 9. stiffening ribs, 10. triangular support frame. DETAILED DESCRIPTION

[0019] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0020] like Figures 1 to 3As shown, the prefabricated steel pipe inner support used in the deep foundation pit project of the present invention comprises a support rod, which is formed by splicing a number of steel pipe sections in sequence, the steel pipe sections comprising one or two of standard steel pipe sections 1 and short-circuit steel pipe sections 2, both ends of the standard steel pipe sections 1 and the short-circuit steel pipe sections 2 are provided with flanges 8 for easy splicing, both ends of the support rod are spliced ​​with special-shaped flexible nodes, the special-shaped flexible nodes are limitedly abutted on the tray 3, a triangular support frame 10 is provided at the bottom of the tray 3, and the triangular support frame 10 and the tray 3 are welded to the embedded steel plate on the inner side of the foundation pit; so as to achieve stable support; in addition, the special-shaped flexible nodes can also be welded to the tray 3, so that the present invention can withstand both the axial pressure of the internal support and the tensile force, thereby avoiding the possibility of continuous damage to the entire foundation pit due to the instability of local nodes to a great extent.

[0021] The special-shaped flexible node includes a first circular steel plate 4, which is fixedly connected to the second circular steel plate 6 through two first steel sleeves 5 of different sizes, and the two first steel sleeves 5 are coaxially nested. The second circular steel plate 6 is fixedly connected to the flange 8 through two second steel sleeves 7 of different sizes, and the two second steel sleeves 7 are coaxially nested. The axes of the first steel sleeve 5 and the second steel sleeve 7 coincide, and the radial dimensions of the two first steel sleeves 5 correspond one by one to the radial dimensions of the two second steel sleeves 7 respectively; a plurality of stiffening ribs 9 are arranged on the outer edge of the steel sleeve between the second circular steel plate 6 and the flange 8.

[0022] All components of the prefabricated steel pipe internal support of this scheme are made of Q420-B steel and adopt a prefabricated structure. They can be constructed on site and are easy to disassemble and assemble. At the same time, the standard section steel pipe 1 and the short-section steel pipe 2 can be selected and matched according to the actual requirements of the foundation pit width to achieve support for foundation pits of different widths. At the same time, this scheme does not require the setting of a neutral column, providing a larger working space for foundation pit excavation; this scheme adopts a combined support form of special-shaped flexible nodes and steel pipes, which has high rigidity, good force performance, sufficient bearing capacity and overall stability, and can be used in situations where the support axial force is large. At the same time, the special-shaped flexible nodes make the overall support force more clear and concentrated.

[0023] The following is a detailed description of the working process of this program:

[0024] First, the pallet 3, triangular support frame 10, special-shaped flexible nodes, standard steel pipe 1, short-section steel pipe 2 and flange 8 are prefabricated in the factory. The flange 8 needs to be drilled around it and equipped with studs and nuts of corresponding numbers and sizes. After the processing and assembly of each component is completed, it is transported to the construction site. First, locate and fix the special-shaped flexible nodes, embed the embedded steel plate into the ground-connected wall, weld the triangular support frame 10 and the pallet 3 to the embedded steel plate of the ground-connected wall, and support the pallet 3 on the inner side of the foundation pit, and wait for the special-shaped flexible nodes on both sides to be fixed. After installation and fixation and reaching the strength requirements, the internal supporting components are hoisted, and the standard section steel pipe 1 and the short-connection section steel pipe 2 are assembled on site. They are connected with bolts to form a complete section of assembled steel pipe, and hoisted into the installed special-shaped active node position; the size of the short-connection section steel pipe 2 is determined according to the width of the on-site foundation pit; after the hoisting is completed, the joint section is caulked, and the joint gap is filled with the short-connection section steel pipe 2. If the joint gap is smaller than the minimum length of the short-connection section steel pipe 2, the flange 8 can be used for embedded filling.

Claims

1. An assembled steel pipe inner support for deep foundation pit engineering, characterized in that: It includes a support rod, which is formed by splicing several section steel pipes in sequence. The section steel pipes include one or both of standard section steel pipes and short-section steel pipes. Both ends of the support rod are spliced ​​with special-shaped flexible nodes. The special-shaped flexible nodes are limitedly abutted on a pallet, and the pallet is fixed on the supporting point on the inner side of the foundation pit.

2. The assembled steel pipe inner support for deep foundation pit engineering according to claim 1 is characterized in that: The special-shaped flexible node includes a first circular steel plate, which is fixedly connected to a second circular steel plate through a plurality of first steel sleeves of different sizes, and the plurality of first steel sleeves are coaxially nested. The second circular steel plate is fixedly connected to a flange through a plurality of second steel sleeves of different sizes, and the plurality of second steel sleeves are coaxially nested.

3. The assembled steel pipe inner support for deep foundation pit engineering according to claim 2 is characterized in that: The axes of the first steel sleeves coincide with the axes of the second steel sleeves, and the radial dimensions of the first steel sleeves correspond to the radial dimensions of the second steel sleeves.

4. The assembled steel pipe inner support for deep foundation pit engineering according to claim 2, characterized in that: The outer edge of the steel sleeve located between the second circular steel plate and the flange is provided with a plurality of stiffening ribs.

5. The assembled steel pipe inner support for deep foundation pit engineering according to claim 1, characterized in that: A triangular support frame is arranged at the bottom of the tray, and the triangular support frame is welded to the embedded steel plate inside the foundation pit.

6. The assembled steel pipe inner support for deep foundation pit engineering according to claim 1, characterized in that: Both ends of the standard section steel pipe and the short section steel pipe are provided with flanges for easy splicing.

7. The assembled steel pipe inner support for deep foundation pit engineering according to any one of claims 1 to 6, characterized in that: The assembled steel pipe inner support is made of Q420-B steel.

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