Fabricated stand column in foundation pit

Abstract

The invention relates to an assembly type stand column in a foundation pit. The assembly type stand column comprises a plurality of standard stand column units, a plurality of screws and nuts. Each standard stand column unit comprises a main steel pipe and a conical steel pipe which are connected into a whole from top to bottom. A plurality of groups of open holes are formed in the main steel pipe, and each group of open holes comprises two open holes which are spaced by 180 degrees; in the two open holes, a groove body is welded and fixed on the first open hole in the inner wall of the steel pipe, and a small hole corresponding to the open hole in position is formed in the groove body; the second opening is open; the screw rod penetrates through the small hole from the first open hole and finally extends into the second open hole, and a screw rod head of the screw rod is arranged in the groove body; the nut is screwed into the tail end of the screw rod and is arranged in the second open hole; and two groups of screw holes corresponding to the longitudinal positions of the two groups of open holes are formed in the conical steel pipe, the conical steel pipe can be inserted into the main steel pipe of the other standard stand column unit below the conical steel pipe, the conical steel pipe avoids the groove body, and the screw holes are coaxial with the corresponding small holes.

Description

Technical Field

[0001] This invention relates to a prefabricated column for use in underground foundation pit support engineering, belonging to the field of building construction technology. Background Technology

[0002] In current deep foundation pit engineering, both circular steel pipe columns and lattice columns, as the mainstream support methods, face significant construction bottlenecks. Circular steel pipe columns, limited by the length of a single section, require on-site welding for extensions. The full welding process not only results in a very high weld ratio but also easily leads to deformation, severely restricting the accuracy of verticality control. Lattice columns, due to the need for multi-node assembly, such as the four-sided welding of angle steel main members and connecting plates, result in frequent welding operations, significantly slowing down construction progress and generating substantial consumption of welding materials and solid waste. The common drawbacks of both methods lie in their connection methods.

[0003] Furthermore, the corbel joints on the columns are all welded, making disassembly difficult and prone to damaging components. Inaccurate welding positions or re-welding due to changes further increase the labor intensity of welding. At the same time, the high-frequency welding process demands stringent technical skills from workers, exacerbating construction delays and environmental pressures. Traditional column construction heavily relies on manual, labor-intensive welding, and its inherent defects have become a core bottleneck restricting project efficiency and sustainability, urgently requiring breakthroughs through modular design or automation technology. Summary of the Invention

[0004] The purpose of this invention is to provide a prefabricated column for use in underground foundation pit support engineering, which solves the technical problems of difficult disassembly, easy damage, and high labor intensity caused by the intensive welding process used in existing columns.

[0005] The present invention adopts the following technical solution:

[0006] A prefabricated column for use in foundation pits includes multiple standard column units, multiple screws 3, and nuts 4. Each standard column unit includes a main steel pipe 1 and a tapered steel pipe 2, which are connected as a single unit from top to bottom. The main steel pipe 1 has multiple sets of openings, each set consisting of two openings spaced 180° apart. Of the two openings: the first opening is located on the inner wall of the steel pipe where a groove 5 is welded and fixed, and a small hole corresponding to the opening position is formed on the groove 5; the second opening is an opening on the outer wall of the main steel pipe. The screws... 3. The screw head of the screw 3 passes through the small hole from the first opening and finally extends into the second opening, and is placed in the groove body 5; the nut 4 is screwed into the end of the screw 3 and placed in the second opening; two sets of screw holes 201 are opened on the tapered steel pipe 2, which correspond to the longitudinal positions of the two sets of openings. The tapered steel pipe 2 can be inserted into the main steel pipe 1 of another standard column unit below, so that the tapered steel pipe 2 avoids the groove body 5, and the screw hole 201 is coaxial with the corresponding small hole 501.

[0007] Preferably, the screw head does not extend beyond the outer wall of the main steel pipe 1, and the nut 4 does not extend beyond the outer wall of the main steel pipe 1.

[0008] Preferably, the main steel pipe 1 is a round pipe and the tapered steel pipe 2 is a tapered pipe; the bottom of the round pipe and the top of the tapered pipe form a step, so that the outer diameter of the large end of the tapered pipe matches the inner diameter of the round pipe.

[0009] Preferably, the two sets of openings are square holes; the width of the square holes is adapted to the outer diameter of the screw head; the width of the square holes is also adapted to the outer diameter of the nut; under force, the screw 3 causes the bolt head and nut to form an interference fit with the square holes.

[0010] Preferably, the two sets of openings are staggered in height; the corresponding two screws 3 are also staggered and perpendicular to each other.

[0011] Preferably, it also includes a clamp-type bracket 6, which includes two splicing units. Each splicing unit includes a clamp section 604, and a bracket section 601 extends from both ends of the clamp section 604. The bracket section 601 is provided with a set of bolt holes for bolts 603 to pass through. A pair of clamp sections 604 are clamped and fixed at selected positions on the main steel pipe 1 and connected and fixed by bolts 603.

[0012] Furthermore, the two splicing units are completely identical and constitute a standard splicing unit.

[0013] Furthermore, the clamp segment 604 is semi-circular.

[0014] Furthermore, a limiting plate 602 extends upward from the outer end of the cow leg segment.

[0015] Furthermore, the clamp-type bracket 6 supports the support beam in the foundation pit, and the support frame supports 1-2 components to be supported corresponding to one excavation layer above.

[0016] Furthermore, the component to be supported is one of the following: a steel support, a transverse prestressed component, or a tensioned beam.

[0017] The advantages of this invention are:

[0018] 1) The columns adopt multi-specification prefabricated standard steel pipes. The column height can be customized according to the requirements. Adjacent standard columns are connected by screws, which is reliable and convenient and flexible to assemble.

[0019] 2) The clamp-type bracket adopts a two-semi-circular ring structure, which is simple in structure, adjustable in installation height, and securely fixed by bolt connection. It has high load-bearing capacity, is easy and quick to assemble and unload, can be recycled, has no welding process, and does not pollute the environment.

[0020] 3) Solves the problems of traditional column length requiring cutting and on-site welding, bracket welding, inaccurate on-site positioning, and inconvenient angle adjustment (especially when secondary positioning and adjustment are required).

[0021] 4) Two screws are used to fix the tapered steel pipe to the main steel pipe. At the same time, a step (with load-bearing function) is set at the connection between the main steel pipe and the tapered steel pipe to reduce the stress on the screws and make the structure more reliable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the prefabricated column inside the foundation pit of this invention.

[0023] Figure 2 This is a schematic diagram of a standard column unit.

[0024] Figure 3 This is a schematic diagram of a ferrule-type bracket.

[0025] Figure 4 This is an exploded view of the prefabricated columns inside the foundation pit of this invention.

[0026] Figure 5 This is a schematic diagram of a tapered steel pipe avoiding a groove.

[0027] Figure 6 This is a schematic diagram of the prefabricated columns installed in the foundation pit of the present invention to support the components above.

[0028] In the diagram, 1. round steel pipe, 2. variable cross-section, 3. screw rod, 4. nut, 5. groove body, 6. clamp-type bracket, 7. first column standard component (first standard column unit), 8. second column standard component, 601. bracket section, 602. limiting plate, 603. bolt, 604. clamp section, 501. small hole (groove hole), 201. screw rod hole. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] See Figure 1 A prefabricated column for use in foundation pits, comprising multiple standard column units. Figure 1 It shows two column units stacked together.

[0031] Figure 2 The structure of a single standard column unit is shown. The prefabricated columns in the foundation pit also include multiple screws 3 and nuts 4. Figure 2 The image shows two screws (3);

[0032] A single standard column unit consists of a main steel pipe 1 and a tapered steel pipe 2, which are connected as one unit from top to bottom;

[0033] See also Figure 2 The main steel pipe 1 is provided with multiple sets of openings ( Figure 2 Two sets of openings were shown, each set consisting of two openings spaced 180° apart;

[0034] See also Figure 2 Of the two openings: the first opening is located on the inner wall of the steel pipe where a groove 5 is welded and fixed, and a small hole 501 corresponding to the opening position is made on the groove 5; the second opening is an opening on the outer wall of the main steel pipe; the screw 3 passes through the small hole from the first opening and finally extends into the second opening, with the screw head of the screw 3 placed inside the groove 5; the nut 4 is screwed into the end of the screw 3 and placed inside the second opening;

[0035] The groove 5 is a rectangular block structure with one open side and five closed sides. Its structure is not fully shown; details can be found in the attached image. Figure 2 and attached Figure 5 Its structure can be understood.

[0036] like Figure 2 and 4 As shown, the tapered steel pipe 2 has two sets of screw holes 201 corresponding to the longitudinal positions of the two sets of openings. The tapered steel pipe 2 can be inserted into the main steel pipe 1 of another standard column unit below, so that the tapered steel pipe 2 avoids the groove body 5 (e.g. Figure 5 As shown), and the screw hole 201 is coaxial with the corresponding small hole.

[0037] In this embodiment, such as Figure 2 As shown, the screw head does not protrude from the outer wall of the main steel pipe 1, and the nut 4 does not protrude from the outer wall of the main steel pipe 1, thereby minimizing the presence of additional protruding parts on the round steel pipe 1 and improving its aesthetics and safety.

[0038] See Figure 2 and combined Figure 4 The main steel pipe 1 is a round pipe, and the tapered steel pipe 2 is a tapered pipe; the bottom of the round pipe and the top of the tapered pipe form a step, so that the outer diameter of the large end of the tapered pipe matches the inner diameter of the round pipe.

[0039] See Figure 2 The two sets of openings are square holes; the width of the square holes is adapted to the outer diameter of the screw head; the width of the square holes is also adapted to the outer diameter of the nut; under force, the screw 3 causes the bolt head and nut to form an interference fit with the square holes.

[0040] Understandably, the two sets of openings need to be staggered in height; the corresponding two screws 3 are also staggered and perpendicular to each other.

[0041] See Figure 1 and Figure 3The prefabricated columns in this foundation pit also include clamp-type brackets 6. The clamp-type brackets 6 include two splicing units. Each splicing unit includes a clamp section 604. The clamp section 604 extends from both ends into a bracket section 601. The bracket section 601 is provided with a set of bolt holes for bolts 603 to pass through. A pair of clamp sections 604 are clamped and fixed at selected positions on the main steel pipe 1 and connected and fixed by bolts 603.

[0042] It should be noted that the clamping force of the clamping section 604 on the round steel pipe 1 can meet certain load-bearing requirements. The load-bearing requirement of the column in this invention is only to support the support beam under an excavation layer, so the load-bearing requirement can be met.

[0043] See Figure 3 The two splicing units are identical and constitute a standard splicing unit.

[0044] See also Figure 3 The clamp section 604 is semi-circular.

[0045] A limiting plate 602 extends upward from the outer end of the cow leg segment.

[0046] See Figure 6 The clamp-type bracket 6 supports the support beam in the foundation pit, and supports 1-2 components to be supported above the support frame corresponding to one excavation layer.

[0047] Specifically, the component to be supported can be any of the following structures: steel support, transverse prestressed component, tensioned beam, etc. Figure 6 The component to be supported on display is a steel support.

[0048] In summary, and as can be seen from the accompanying drawings, the present invention mainly consists of two parts: a standard column unit (standard column component) and a clamp-type bracket.

[0049] The standard column component has different cross-sectional structures at both ends: one end is a standard round steel pipe, and the other end is a tapered steel pipe with a variable cross-section. In this embodiment, four grooves 5 are welded onto the standard round steel pipe. Each groove 5 is a component that is closed on five sides and open on one side, with the open side facing the inner wall of the round steel pipe 1. Figure 2 As shown.

[0050] The grooved body has four grooved holes (small holes), and the variable cross-section steel pipe has four screw holes. When installing two standard column components, the variable cross-section steel pipe is inserted into the standard round steel pipe, and two screws are passed through the screw holes and grooved holes in a crisscross pattern and secured with nuts to fix the two standard column components. The grooved holes allow the nuts to be hidden inside the steel pipe. When the variable cross-section steel pipe of a single standard column component is embedded, it avoids the four grooves. The standard column components use modular standardized dimensions, allowing for splicing according to corresponding specifications and reducing on-site welding work.

[0051] The clamp-type bracket mainly consists of two identical semi-circular ring structures, which are fixed together by bolts. The semi-circular ring structure comprises a clamp section 604, a bracket section 601, and a limiting plate 602. Both the clamp section 604 and the bracket section 601 are made of channel steel. The clamp section 604 is pressed into a semi-circular shape from the channel steel. The bracket section 601 is used to hold support beams and other components, while the limiting plate 602 prevents the support beams and other structures from falling, providing safety protection. The height and angle can be adjusted according to the specific position of the support beam. The bolt connection eliminates the need for welding during on-site installation and disassembly, and the bracket can be reused.

[0052] Specific construction methods

[0053] 1) Determine the height and specifications of the columns according to the column design requirements;

[0054] 2) See Figure 1 The variable cross-section steel pipe at one end of the second column standard component 7 is inserted into the round steel pipe at one end of the first column standard component 7, and two screws are passed through the screw holes in a cross manner. The nuts are tightened, and the two are spliced ​​together to form a combination.

[0055] 3) The assembled columns are transported to the site for hoisting. If the design height does not match the site height, additional or disassembled columns can be installed.

[0056] 4) After the columns are installed, the height and angle of the brackets can be determined;

[0057] 5) The two semi-circular ring structures are joined together to form a clamp-type bracket, and are fixedly connected with bolts;

[0058] 6) After the prefabricated columns and clamp-type brackets are installed, other support beams can be erected and steel supports can be installed. Limiting plates prevent the support beams from falling off.

[0059] 7) After the project is completed, dismantling work will be carried out. After the support beam is dismantled, the bolts on the bracket section can be loosened to remove it. Loosen the nuts in the groove of the column, pull out the screw, and the two standard sections of the column can be dismantled.

[0060] This invention utilizes multi-specification prefabricated standard steel pipe sections for the columns. Column height can be customized to meet specific needs. Adjacent standard column components are connected by bolts, ensuring reliable connection and convenient, flexible assembly. The clamp-type bracket employs a two-semi-circular ring structure, featuring a simple design. Installation height, position, and angle are adjustable, and bolted connections provide a secure fixation, high load-bearing capacity, and easy and quick assembly and disassembly. It is reusable, requires no welding, and causes no environmental pollution. This invention solves the problems of traditional column length cutting and on-site welding, bracket welding, inaccurate on-site positioning, and inconvenient angle adjustment. Adjacent standard column sections utilize variable cross-section steel pipes fitted into a round steel pipe and bolted together, resolving various process issues associated with traditional welding. Installation is efficient, energy-saving, and highly precise.

[0061] The above are preferred embodiments of the present invention. Those skilled in the art can make various modifications or improvements based on these embodiments. Without departing from the overall concept of the present invention, such modifications or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A prefabricated column for use in a foundation pit, characterized in that: It includes multiple standard column units, multiple screws (3) and nuts (4); The standard column unit includes a main steel pipe (1) and a tapered steel pipe (2), which are connected as one unit from top to bottom; The main steel pipe (1) is provided with multiple sets of openings, each set of openings consisting of two openings spaced 180° apart; Of the two openings: the first opening is located on the inner wall of the steel pipe where a groove body (5) is welded and fixed, and a small hole (501) corresponding to the opening position is opened on the groove body (5); The second opening is an opening on the outer wall of the main steel pipe; The screw (3) passes through the small hole from the first opening and finally extends into the second opening, with the screw head of the screw (3) placed in the groove body (5); The nut (4) is screwed into the end of the screw (3) and placed in the second opening; The tapered steel pipe (2) has two sets of screw holes (201) corresponding to the longitudinal positions of the two sets of openings. The tapered steel pipe (2) can be inserted into the main steel pipe (1) of another standard column unit below, so that the tapered steel pipe (2) avoids the groove body (5), and the screw hole (201) is coaxial with the corresponding small hole.

2. The prefabricated column in the foundation pit as described in claim 1, characterized in that: The screw head does not extend beyond the outer wall of the main steel pipe (1), and the nut (4) does not extend beyond the outer wall of the main steel pipe (1).

3. The prefabricated column in the foundation pit as described in claim 1, characterized in that: The main steel pipe (1) is a round pipe, and the tapered steel pipe (2) is a tapered pipe; the bottom of the round pipe and the top of the tapered pipe form a step, so that the outer diameter of the large end of the tapered pipe matches the inner diameter of the round pipe.

4. The prefabricated column in the foundation pit as described in claim 1, characterized in that: The two sets of openings are square holes; the width of the square holes is adapted to the outer diameter of the screw head; the width of the square holes is also adapted to the outer diameter of the nut; the screw (3) under force makes the bolt head and nut form an interference fit with the square holes.

5. The prefabricated column in the foundation pit as described in claim 1, characterized in that: The two sets of openings are staggered in height; the corresponding two screws (3) are also staggered and perpendicular to each other.

6. The prefabricated column in the foundation pit as described in claim 1, characterized in that: It also includes a clamp-type bracket (6), which includes two splicing units, each splicing unit including a clamp section (604), the clamp section (604) extending from both ends into a bracket section (601), the bracket section (601) having a set of bolt holes for bolts (603) to pass through; A pair of clamp segments (604) are clamped and fixed at selected positions on the main steel pipe (1) and connected and fixed by bolts (603).

7. The prefabricated column in the foundation pit as described in claim 5, characterized in that: The two splicing units are identical and constitute a standard splicing unit.

8. The prefabricated column in the foundation pit as described in claim 6, characterized in that: The clamp section (604) is semi-circular.

9. The prefabricated column in the foundation pit as described in claim 5, characterized in that: A limiting plate (602) extends upward from the outer end of the cow leg segment.

10. The prefabricated column in the foundation pit as described in claim 5, characterized in that: The clamp-type bracket (6) supports the support beam in the foundation pit, and supports 1-2 components to be supported above the support beam corresponding to one excavation layer; the components to be supported are one of steel supports, transverse prestressed components, and tensioned beams.

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