Connection device and construction method for dismantling steel supports in deep foundation pits of underground engineering projects

Abstract

This invention provides a connection device and construction method for the dismantling of steel supports in deep foundation pits penetrating underground engineering projects. The connection device includes a force transmission conversion section and connectors at both ends of the force transmission conversion section. The force transmission conversion section penetrates the underground engineering project and is connected to the steel support through the connectors. The force transmission conversion section includes at least two structural steel sections and multiple fixing plates connected to form a through-tube in the middle. At least two structural steel sections are connected by the fixing plates, which are located on the sides of the structural steel sections. The connectors are fixedly connected to both ends of the structural steel sections. By using the force transmission conversion section in conjunction with the connectors to connect to the steel support, installation and dismantling are simple, reducing construction difficulty and shortening the construction period. Moreover, compared with traditional construction methods, it reduces excessive cutting of the steel support and reduces steel waste.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to the connection device and construction method for the dismantling of steel supports for deep foundation pits in underground engineering projects. Background Technology

[0002] With the increasing scale and speed of urban underground space development, the installation and dismantling of deep foundation pit support structures have a significant impact on the construction cycle and safety of underground engineering projects. During the dismantling phase of the foundation pit support structure, the rationality of the arrangement of the replacement support structure, the timing of support dismantling, and the control of structural deformation, all seriously affect the engineering quality of the main structure. Currently, the dismantling of steel supports for deep foundation pits can only proceed after the pouring, waterproofing, backfilling, and replacement support structure construction of the main structure below the support are completed and meet design requirements. Traditional construction methods have many drawbacks, including numerous pre-construction procedures, high quality requirements, significant impact on the construction cycle of underground structures, and difficulty in controlling the quality of underground structures. Summary of the Invention

[0003] The present invention addresses the problems existing in the prior art by providing a connection device and construction method for dismantling steel supports in deep foundation pits that penetrate underground engineering. This method is characterized by simple construction, convenient installation and dismantling, high efficiency, and steel saving.

[0004] To address the aforementioned technical problems, embodiments of the present invention provide a connection device for the dismantling of steel supports in deep foundation pits that penetrate underground engineering projects. The device includes a force transmission conversion section and connectors disposed at both ends of the force transmission conversion section. The force transmission conversion section penetrates the underground engineering project and is connected to the steel support through the connectors.

[0005] Preferably, the force transmission conversion section includes at least two steel sections and multiple fixing plates connected to form a cylinder with a through-hole in the middle. At least two of the steel sections are connected through the fixing plates, which are located on the side of the steel sections. The connecting members are fixedly connected to both ends of the steel sections.

[0006] Preferably, the steel profile is an angle steel, an H-beam, or a channel steel; if the steel profile is an angle steel, there are four angle steels arranged in a rectangular array, with adjacent angle steels not in contact; if the steel profile is an H-beam or a channel steel, there are two H-beams or channel steels, with the web of the H-beam or the slot of the channel steel facing each other, and adjacent H-beams or channel steels not in contact.

[0007] Preferably, the connecting component is a flange, which is welded to the steel profile and steel support.

[0008] Preferably, waterstop plates are intersecting on the force transmission conversion joint, and the center of the waterstop plate is provided with a through hole with a size smaller than the inner diameter of the cylinder, and the overall size of the waterstop plate is larger than the cross-sectional size of the force transmission conversion joint.

[0009] Preferably, the flange inside the penetration point of the underground project is inclined, and the upper end length of the steel section is shorter than the lower end length.

[0010] Preferably, the fixing plate is provided with shear-resistant steel bars.

[0011] This invention also discloses a construction method for using a connection device for dismantling steel supports in deep foundation pits that penetrate underground engineering, comprising the following steps:

[0012] While the foundation pit is being excavated, fixed corbels and steel walers are installed on the foundation pit support. At the point where the underground engineering structure is penetrated, force transfer joints are used in conjunction with connectors to install and fix steel supports.

[0013] After the underground engineering construction is completed, the steel support is dismantled by removing the connecting parts and the force transmission conversion joint.

[0014] Preferably, during the construction of underground engineering projects, a waterstop is installed on the force transfer joint located in the middle of the outer wall before the construction of the outer wall of the underground structure.

[0015] Preferably, the connecting component is a flange, which is welded to the steel profile and steel support.

[0016] The beneficial effects of this invention are:

[0017] ① The force transfer joint is connected to the steel support with the flange, which makes installation and disassembly simple, reduces construction difficulty, and shortens the construction period;

[0018] ② The force transfer joint, in conjunction with the waterstop plate, ensures the waterproof performance of the underground structure while guaranteeing the strength of the supporting structure;

[0019] ③ Compared with traditional construction methods, it reduces the need for excessive cutting of steel supports and reduces steel waste. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the force transmission conversion section of the connecting device for the dismantling of the deep foundation pit steel support in an underground engineering project according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the connection device for the dismantling of the steel support for the deep foundation pit in an underground engineering project according to an embodiment of the present invention.

[0022] Figure 3 Figure 2 Enlarged view of a portion of the image;

[0023] Figure 4 This is a structural schematic diagram of the force transmission conversion section of the connecting device for the dismantling of the steel support for the deep foundation pit through underground engineering, according to another embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the waterstop plate of the connection device for the dismantling of the steel support for the deep foundation pit in an underground engineering project according to an embodiment of the present invention.

[0025] In the picture:

[0026] 1. Excavation pit support; 2. Corbel; 3. Connecting parts

[0027] 4. Fixing plate; 5. Waterstop plate; 6. Shear reinforcement.

[0028] 7. Steel sections; 8. Structural reinforcing bars; 9. Exterior walls of underground structures.

[0029] 10. Steel walers 11. Steel supports Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0032] For example, such as Figures 1 to 5 As shown, this embodiment of the invention provides a removable connection device for deep foundation pit steel supports penetrating underground engineering projects. The device includes a force transfer section and connectors 3 at both ends of the force transfer section. The force transfer section penetrates the underground engineering project and is connected to the steel support 11 via connectors 3. The force transfer section comprises at least two steel sections 7 and multiple fixing plates 4 connected to form a through-tube. The at least two steel sections 7 are connected by fixing plates 4, which are located on the sides of the steel sections 7. Connectors 3 are fixedly connected to both ends of the steel sections 7. Specifically, the location where the steel support 11 penetrates the underground structure is calculated according to the design drawings. Taking the outer wall of the underground structure as an example, the location where the steel support 11 penetrates the outer wall of the underground structure is calculated, and the force transfer section is installed at this location. Connectors 3 are fixedly connected to both ends of the force transfer section, and the other end of the connector 3 is fixedly connected to the steel support. This ensures that the force transfer section can be embedded in the outer wall of the underground structure during the subsequent construction of the basement outer wall, facilitating the subsequent removal of the steel support.

[0033] In a preferred embodiment, the steel section 7 consists of four angle steels arranged in a rectangular array, with adjacent angle steels not in contact. Preferably, the four angle steels are located at the upper left, lower left, lower right, and upper right positions, respectively. The sides of adjacent angle steels face each other but do not contact, and adjacent sides of adjacent angle steels are fixedly connected using fixing plates 4. Preferably, the fixing plates 4 are steel plates. Furthermore, the fixing plates 4 are spaced apart on the sides of the angle steels to ensure the strength and rigidity of the force transmission conversion joint structure.

[0034] In a preferred embodiment, the steel section 7 is either an H-beam or a channel steel, and there are two of them. The webs of the H-beam or the slots of the channel steel are arranged opposite each other, and adjacent H-beams or channel steels do not contact each other. Specifically, taking an H-beam as an example, two H-beams are placed side by side without contacting each other. Preferably, the flange is on top, and fixing plates 4 are used to fix and connect the two H-beams on the upper and lower flanges respectively. Preferably, the fixing plates 4 are steel plates. Furthermore, the fixing plates 4 are spaced apart on the flanges of the H-beams to ensure the strength and rigidity of the force transmission conversion joint structure. When the steel section 7 is a channel steel, the manufacturing method is the same as that of the H-beam, and will not be further described.

[0035] In a preferred embodiment, the connecting component 3 is a flange, which is welded to the steel section 7 and the steel support 11. Specifically, flanges are welded to both ends of the force transmission conversion section, and flanges are also welded to the corresponding positions of the steel support 11. The force transmission conversion section and the steel support are connected via flanges, making installation and disassembly very convenient.

[0036] In a preferred embodiment, the flange on the inner side of the underground engineering penetration location is inclined, and the upper length of the steel section 7 is shorter than the lower length. Specifically, the force transmission conversion joint is generally shaped like a right-angled trapezoid or a trapezoid, with the trapezoid being narrower at the top and wider at the bottom. That is, one or both flanges at both ends of the force transmission conversion joint are inclined, which facilitates connection, disassembly, and adjustment with the steel support 11.

[0037] In a preferred embodiment, waterstop plates 5 are intersecting and arranged on the force transmission conversion joint. Each waterstop plate 5 has a through hole at its center, the size of which is smaller than the inner diameter of the cylinder. The overall size of the waterstop plate 5 is larger than the cross-sectional size of the force transmission conversion joint. Specifically, as shown... Figure 5As shown, the waterstop plate 5 is circular or rectangular with a through hole in the center. The waterstop plate 5 has a groove corresponding to the shape of the force transmission conversion joint. Before connecting the fixing plate 4, the waterstop plate 5 is fitted onto the force transmission conversion joint. Later, the waterstop plate 5 is welded to the force transmission conversion joint, ensuring that the waterstop plate 5 is located in the middle of the underground structure's outer wall to complete its water-stopping function. Furthermore, the waterstop plate 5 has a thickness of not less than 6mm and a width of not less than 150mm. It is fully welded around its perimeter where it contacts the force transmission conversion joint, without any gaps, to prevent groundwater from penetrating into the interior.

[0038] Before the underground structure is constructed up to the force transfer joint, the force transfer joint is ground and rusted.

[0039] In a preferred embodiment, shear reinforcement 6 is provided on the fixing plate 4. Specifically, as shown... Figure 4 As shown, shear reinforcement bars 6 are welded onto the fixed plate 4. Specifically, four shear reinforcement bars 6 are welded onto the fixed plate 4 on the force transfer joint in a "well" shape to locally strengthen the external wall structure. The type and quantity of shear reinforcement bars 6 are determined based on the calculation results of the actual structural requirements.

[0040] This invention also discloses a construction method for using a connection device for dismantling steel supports in deep foundation pits that penetrate underground engineering, comprising the following steps:

[0041] While the foundation pit is being excavated, fixed brackets 2 and steel walers 10 are installed on the foundation pit support 1. At the point where the underground engineering structure is penetrated, a force transfer joint is used in conjunction with connectors 3 to install and fix steel supports 11.

[0042] After the underground engineering construction is completed, the steel support 11 is dismantled by removing the connecting piece 3 and the force transmission conversion joint.

[0043] In a preferred embodiment, during the construction of the underground project, a waterstop plate 5 is installed on the force transmission conversion joint located in the middle of the outer wall before the construction of the outer wall of the underground structure.

[0044] In a preferred embodiment, the connecting component 3 is a flange, which is welded to the profile steel 7 and the steel support 11.

[0045] After the underground structure construction is completed and the conditions for removing steel support 11 are met, the steel support 11 is removed. For sections penetrating the underground structure, only the flange needs to be removed to complete the removal of the corresponding steel support. Then, the portion of the force transfer joint extending beyond the underground structure wall is cut off and waterproofed and corrosion-resistant. The removed flange can be reused.

[0046] The above technical solution simplifies installation and disassembly by using a force transfer joint with a flange to connect to the steel support, reducing construction difficulty and shortening the construction period. In addition, the force transfer joint, combined with a waterstop plate, ensures the waterproof performance of the underground structure while maintaining the strength of the support structure. Moreover, compared with traditional construction methods, it reduces excessive cutting of steel supports and reduces steel waste.

[0047] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A connection device for the dismantling of steel supports in deep foundation pits penetrating underground engineering projects, characterized in that, It includes a force transfer section and connectors disposed at both ends of the force transfer section. The force transfer section passes through the underground project and is connected to the steel support through the connectors. The force transmission conversion section includes at least two steel sections and multiple fixing plates. The at least two steel sections and multiple fixing plates are connected to form a cylinder with a through-hole in the middle. The at least two steel sections are connected through the fixing plates. The fixing plates are located on the side of the steel sections. The connecting members are fixedly connected to both ends of the steel sections. Shear-resistant steel bars are provided on the fixing plates. The force transmission conversion joint is generally shaped like a right-angled trapezoid or a trapezoid, with the trapezoid being narrower at the top and wider at the bottom. The connecting component is a flange, which is welded to the steel profile and steel support. The flange inside the underground engineering penetration position is inclined, and the upper end of the steel profile is shorter than the lower end. Waterstop plates are intersecting on the force transmission conversion joint. The center of the waterstop plate has a through hole with a size smaller than the inner diameter of the cylinder. The overall size of the waterstop plate is larger than the cross-sectional size of the force transmission conversion joint.

2. The connection device for dismantling steel supports in deep foundation pits of underground engineering as described in claim 1, characterized in that, The steel profile is an angle steel, an H-beam, or a channel steel. If the steel profile is an angle steel, there are four angle steels arranged in a rectangular array, with adjacent angle steels not in contact. If the steel profile is an H-beam or a channel steel, there are two H-beams or channel steels, with the web of the H-beam or the slot of the channel steel facing each other, and adjacent H-beams or channel steels not in contact.

3. A construction method using the connection device for dismantling steel supports in deep foundation pits through underground engineering as described in claim 1, characterized in that... Includes the following steps: While the foundation pit is being excavated, fixed corbels and steel walers are installed on the foundation pit support. At the point where the underground engineering structure is penetrated, force transfer joints are used in conjunction with connectors to install and fix steel supports. After the underground engineering construction is completed, the steel support is dismantled by removing the connecting parts and the force transmission conversion joint.

4. The construction method according to claim 3, characterized in that, During the construction of underground engineering projects, a waterstop plate is installed on the force transfer joint located in the middle of the outer wall before the construction of the outer wall of the underground structure.

5. The construction method according to claim 3, characterized in that, The connecting component is a flange, which is welded to the steel profile and steel support.

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