Steel casing foundation pit supporting structure

Abstract

The utility model relates to the technical field of geotechnical engineering, in particular to a steel casing foundation pit supporting structure. The steel casing structure is formed by sequentially and fixedly connecting a first section steel casing, at least one standard section steel casing and an adjusting section steel casing from bottom to top, and the first section steel casing, the at least one standard section steel casing and the adjusting section steel casing sequentially and longitudinally sink below the ground line. A foundation pit used for containing the buried integrated sewage pump station is formed in the inner periphery of the steel casing structure. And the concrete bottom sealing structure is poured at the bottom of the foundation pit, the upper half portion of the concrete bottom sealing structure is fixedly connected with the lower half portion of the first section of steel casing through concrete condensation, and the top face of the concrete bottom sealing structure is used for being fixedly connected with the bottom of the buried integrated sewage pump station. The steel casing foundation pit supporting structure solves the technical problems that the construction period is long, the implementation space needed on site is large, and the influence on the surrounding environment is large.

Description

Technical Field

[0001] The present application relates to the field of geotechnical engineering technology, and in particular to a steel casing foundation pit support structure. Background Art

[0002] In urban drainage systems, affected by the terrain, sewage sometimes needs to be pumped from low places to high places. In response to this situation, buried integrated sewage pumping stations are often used in projects to solve the elevation problem in the sewage transfer process. In high-density built-up areas in cities, buildings are relatively dense, and there are many types of underground pipelines supporting urban roads, which makes the implementation space of buried integrated sewage treatment pumping stations relatively limited. In addition, since buried integrated sewage pumping stations have a certain burial depth, attention should be paid to the impact on the surrounding environment during the implementation of the pumping station foundation pit.

[0003] In the prior art, the foundation pit of a pump station is generally constructed using reinforced concrete caissons or steel sheet pile support structures. However, the wall thickness of the reinforced concrete caisson is relatively thick, and the steel bars need to be tied on site, and the concrete needs to be poured to form strength before the caisson is sunk, resulting in a long construction period and a large implementation space required on site. The steel sheet piles of the steel sheet pile support structure will produce large vibrations during the pile driving and pulling processes. This method has a large impact on the surrounding environment, and will cause resonance to nearby buildings and pipelines, etc., which has a large impact. Its use has certain limitations, and the on-site implementation space required for this method is also large. Utility Model Content

[0004] The purpose of this application is to provide a steel casing foundation pit support structure to solve the technical problems existing in the technology used in the existing pump station foundation pit, such as long construction period, large implementation space required on site and large impact on the surrounding environment.

[0005] The present application provides a steel casing foundation pit support structure for constructing an underground integrated sewage pumping station, comprising:

[0006] A steel casing structure, wherein the steel casing structure is formed by a first section steel casing, at least one standard section steel casing and an adjustable section steel casing which are fixedly connected in sequence from bottom to top, and the first section steel casing, at least one standard section steel casing and the adjustable section steel casing are sequentially longitudinally sunk below the ground line, and the inner periphery of the steel casing structure forms a foundation pit, and the foundation pit is used to accommodate an underground integrated sewage pump station;

[0007] A concrete bottom sealing structure is cast at the bottom of the foundation pit, and the upper part of the concrete bottom sealing structure is fixedly connected to the lower part of the first section of the steel casing located at the bottom of the steel casing structure through concrete solidification, and the top surface of the concrete bottom sealing structure is used for fixed connection with the bottom of the buried integrated sewage pumping station.

[0008] Furthermore, the bottom edge of the first section of the steel casing is circumferentially arranged in a sawtooth structure with the tooth tips facing downward.

[0009] Furthermore, a plurality of connectors extending toward the inner periphery of the steel casing structure are fixedly connected to the inner wall of the lower half of the first section of the steel casing, and the connectors are cast into the upper half of the concrete bottom sealing structure.

[0010] Furthermore, the connecting piece is formed by connecting steel bars and steel plates; and / or

[0011] The connecting piece is welded and fixed on the inner wall of the first section of the steel casing.

[0012] Furthermore, the first-section steel casing, the standard-section steel casing and the adjustment-section steel casing are all thin-walled cylindrical structures.

[0013] Furthermore, when there is one standard section steel casing, the annular top surface of the first section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent standard section steel casing, and the annular top surface of the standard section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent adjustment section steel casing;

[0014] When there are two or more standard-section steel casings, the annular top surface of the first-section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent standard-section steel casing, the annular top surface of the standard-section steel casing is welded and fixedly connected to the annular bottom surface of another adjacent standard-section steel casing, and the annular top surface of the standard-section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent adjustment-section steel casing.

[0015] Furthermore, the annular top surface of the first-section steel casing, the annular top surface and annular bottom surface of the standard-section steel casing, and the annular bottom surface of the adjustment-section steel casing are all set to be flat surfaces.

[0016] Furthermore, the spacing of the backfill space between the inner wall of the steel casing structure and the periphery of the buried integrated sewage pumping station is greater than or equal to 50 cm.

[0017] Furthermore, the top surface of the concrete bottom sealing structure is fixedly connected to the base at the bottom of the buried integrated sewage pumping station by expansion bolts.

[0018] Furthermore, the top of the steel casing structure is located below or flush with the implementation working surface, the implementation working surface is located a distance below the ground line, and the top of the buried integrated sewage pumping station is located below the ground line.

[0019] Compared with the prior art, the steel casing foundation pit support structure provided by the present application divides the overall steel casing structure into multiple steel casing sections, namely, the first steel casing section, at least one standard steel casing section and an adjustment steel casing section. During on-site construction, the first steel casing section, one or more standard steel casing sections and the adjustment steel casing section are sequentially longitudinally pressured and sunk into the lower soil to below the ground line, and are sequentially fixedly connected to each other. After each steel casing section (first steel casing section, standard steel casing section, adjustment steel casing section) is pressed in, the soil in the steel casing is excavated out, and excavation is carried out while supporting. The length and weight of each steel casing section after segmentation are greatly reduced compared to the length and weight of the overall steel casing structure. Therefore, when supporting each steel casing section, static pressure without vibration can basically be achieved, and it sinks by its own weight; then it is completely pressed down and excavated. The inner circle of the steel casing structure behind the soil forms a foundation pit for accommodating the buried integrated sewage pumping station; then a concrete bottom sealing structure is poured at the bottom of the foundation pit, which can prevent groundwater outside the foundation pit from pouring into the inside of the foundation pit, and the upper part of the concrete bottom sealing structure is fixedly connected to the lower part of the first section of the steel casing located at the bottom of the steel casing structure through concrete solidification, so that the concrete bottom sealing structure firmly fixes the steel casing structure, enhances the reliability and firmness of the foundation pit support structure, and after the top surface of the concrete bottom sealing structure is fixedly connected to the bottom of the buried integrated sewage pumping station, it can be used as an anti-floating structure of the buried integrated sewage pumping station; after the buried integrated sewage pumping station is placed in the steel casing structure and the bottom is fixedly connected to the concrete bottom sealing structure, the foundation pit is backfilled to complete the construction of the buried integrated sewage pumping station.

[0020] Such arrangement facilitates the prefabrication of multiple sections of steel casing (first section steel casing, standard section steel casing, and adjustment section steel casing) in advance and then transportation to the construction site, thereby reducing the working pressure of on-site construction. Only welding and fixing operations between each section need to be performed on site, which can effectively reduce the workload of on-site operations, greatly shorten the construction period, and reduce the working space required for on-site construction. Moreover, since the wall thickness of the steel casing structure is relatively thin, the construction site of the steel casing foundation pit support structure for the same size of buried integrated sewage pumping station construction is smaller. Moreover, the steel casing structure does not generate vibration when it is constructed in sections in sequence. The operation mode of supporting first and then excavating or supporting and excavating at the same time is adopted, which has little impact on the surrounding environment and effectively reduces the impact of foundation pit excavation on surrounding pipelines or structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A longitudinal cross-sectional view of a steel casing foundation pit support structure provided in an embodiment of the present application;

[0023] Figure 2 A top view of the steel casing foundation pit support structure provided in an embodiment of the present application;

[0024] Figure 3 A schematic cross-sectional view of the first section of the steel casing provided in the embodiment of the present application;

[0025] Figure 4 This is a schematic cross-sectional view of a standard section steel casing provided in an embodiment of the present application.

[0026] Reference numerals:

[0027] 100-Steel casing foundation pit support structure;

[0028] 10-Steel casing structure;

[0029] 11- first section of steel casing;

[0030] 111-zigzag structure;

[0031] 112-connecting piece;

[0032] 12-Standard section steel casing;

[0033] 13-Adjust the steel casing;

[0034] 20-concrete bottom structure;

[0035] 30- backfill space;

[0036] 200-Buried integrated sewage pumping station;

[0037] 301-ground line;

[0038] 302-Implement the working surface. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] like Figures 1 to 4As shown, the embodiment of the present application provides a steel casing foundation pit support structure 100 for constructing an underground integrated sewage pump station 200. The steel casing foundation pit support structure 100 includes a steel casing structure 10 and a concrete bottom structure 20 cast at the bottom of the foundation pit. The steel casing structure 10 is formed by a first section steel casing 11, at least one standard section steel casing 12 and an adjustment section steel casing 13 fixedly connected in sequence from bottom to top. The fixed connection can be welded. Specifically, the first section steel casing 11 is located at the lower part of the steel casing structure 10, one or more standard section steel casings 12 are located in the middle part of the steel casing structure 10, and the adjustment section steel casing 13 is located at the upper part of the steel casing structure 10. The first section steel casing 11, at least one standard section steel casing 12 and the adjustment section steel casing 13 are sequentially longitudinally sunk below the ground line 301, and the inner periphery of the steel casing structure forms a foundation pit, which is used to accommodate the underground integrated sewage pump station 200.

[0047] The depth length dimension of the aforementioned steel casing foundation pit support structure 100 is adjusted accordingly according to the total longitudinal length dimension of the buried integrated sewage pumping station 200 to be constructed. If the depth length dimension is large, two or more aforementioned standard-section steel casings 12 can be used, and the longitudinal length dimension of the adjustment-section steel casing 13 can also be adjusted for fine-tuning. The dimensions of the aforementioned standard-section steel casing 12 and the aforementioned first-section steel casing 11 can adopt standard dimensions to facilitate unified mass production.

[0048] The aforementioned concrete bottom sealing structure 20 can prevent groundwater outside the foundation pit from pouring into the inside of the foundation pit. The upper part of the concrete bottom sealing structure 20 and the lower part of the aforementioned first section steel casing 11 located at the lower part of the aforementioned steel casing structure 10 can be fixedly connected by concrete solidification, so that the concrete bottom sealing structure 20 is firmly fixed, thereby enhancing the reliability and firmness of the foundation pit support structure. The top surface of the concrete bottom sealing structure 20 is used to be fixedly connected with the bottom of the buried integrated sewage pumping station 200 to fix the buried integrated sewage pumping station 200, and can serve as an anti-floating structure of the buried integrated sewage pumping station 200. Specifically, the top surface of the concrete bottom sealing structure 20 and the base at the bottom of the buried integrated sewage pumping station 200 can be reliably fixedly connected by expansion bolts.

[0049] A backfill space 30 is left between the inner wall of the steel casing structure 10 and the periphery of the buried integrated sewage pump station 200 for backfilling the foundation pit soil. Preferably, the distance between the inner wall of the steel casing structure 10 and the periphery of the buried integrated sewage pump station 200 is greater than or equal to 50 cm, so as to facilitate backfilling and achieve compaction and stability of the backfill soil.

[0050] Compared with the prior art, the steel casing foundation pit support structure 100 provided in the embodiment of the present application divides the overall steel casing structure 10 into multiple steel casing sections, namely, a first steel casing section 11, at least one standard steel casing section 12 and an adjustment steel casing section 13. During on-site construction, the first steel casing section 11, one or more standard steel casing sections 12 and the adjustment steel casing section 13 are sequentially longitudinally pressed down and pressed into the lower soil to below the ground line 301, and are sequentially fixedly connected to each other. After each steel casing section (the first steel casing section 11, the standard steel casing section 12, the adjustment steel casing section 13) is pressed in, the soil in the steel casing is excavated out, and the excavation is carried out while supporting. The length and weight of each steel casing section after the segmentation are greatly reduced compared to the length and weight of the overall steel casing structure 10. Therefore, when supporting each steel casing section, static pressure without vibration can basically be achieved, and it sinks by its own weight; then the soil is completely pressed down and excavated. The inner periphery of the steel casing structure 10 forms a foundation pit for accommodating the buried integrated sewage pumping station 200; then a concrete bottom sealing structure 20 is poured at the bottom of the foundation pit, which can prevent groundwater outside the foundation pit from pouring into the inside of the foundation pit, and the upper half of the concrete bottom sealing structure 20 is fixedly connected with the lower half of the first section of the steel casing 11 located at the bottom of the steel casing structure 10 through concrete solidification, so that the concrete bottom sealing structure 20 firmly fixes the steel casing structure 10, enhances the reliability and firmness of the foundation pit support structure, and after the top surface of the concrete bottom sealing structure 20 is fixedly connected to the bottom of the buried integrated sewage pumping station 200, it can be used as an anti-floating structure of the buried integrated sewage pumping station 200; after the buried integrated sewage pumping station 200 is placed in the steel casing structure 10 and the bottom is fixedly connected to the concrete bottom sealing structure 20, the foundation pit is backfilled to complete the construction of the buried integrated sewage pumping station 200.

[0051] Such arrangement facilitates the prefabrication of multiple sections of steel casing (including the first section steel casing 11, the standard section steel casing 12, and the adjustment section steel casing 13) in advance and then transporting them to the construction site, thereby reducing the work pressure of on-site construction. Only welding and fixing operations between each section need to be performed on site, which can effectively reduce the workload of on-site operations, greatly shorten the construction period, and reduce the work space required for on-site construction. Moreover, since the wall thickness of the steel casing structure 10 is relatively thin, the foundation pit support structure of the buried integrated sewage pumping station 200 of the same size is constructed, and the construction site of the steel casing foundation pit support structure 100 occupies a smaller area. Moreover, the steel casing structure 10 does not generate vibration when it is constructed in sections in sequence, and adopts an operation mode of supporting first and then excavating or supporting and excavating at the same time, which has little impact on the surrounding environment and effectively reduces the impact of foundation pit excavation on surrounding pipelines or structures.

[0052] A preferred embodiment is as follows Figure 1 and Figure 3As shown, the bottom edge of the aforementioned first section steel casing 11 is circumferentially arranged into a sawtooth structure 111, with the tooth tips facing downward, so that in the process of pressing down each section of steel casing (including the first section steel casing 11, the standard section steel casing 12, and the adjustment section steel casing 13) during the construction project, the lower soil can be continuously cut for the foundation pit support system, making the pressing process more labor-saving and faster.

[0053] Another preferred embodiment is as follows Figures 1 to 3 As shown, the inner wall of the lower half of the first section of the steel casing 11 can be circumferentially fixedly connected with a plurality of connectors 112 extending toward the inner periphery of the steel casing structure 10. When the concrete bottom sealing structure 20 is cast, the connectors 112 are cast in the upper half of the concrete bottom sealing structure 20. The connection between the steel casing structure 10 and the concrete bottom sealing structure is further strengthened, and the firmness and stability of the steel casing structure 10 are further improved.

[0054] On the basis of the above-mentioned embodiment, preferably, the above-mentioned multiple connectors 112 are evenly spaced along the inner wall of the lower half of the first section of the steel casing 11 to improve the uniformity of the connection. More preferably, the connector 112 can be formed by connecting steel bars and steel plates. More preferably, the connector 112 can be fixedly connected to the inner wall of the first section of the steel casing 11 by a fixed connection method of welding.

[0055] In a specific embodiment, the first-section steel casing 11, the standard-section steel casing 12 and the adjustment-section steel casing 13 can all be thin-walled cylindrical structures to further reduce the construction area and construction space.

[0056] An optional connection embodiment is that when there is only one standard section steel casing 12, the annular top surface of the first section steel casing 11 is welded and fixedly connected to the annular bottom surface of the adjacent standard section steel casing 12, and the annular top surface of the standard section steel casing 12 is welded and fixedly connected to the annular bottom surface of the adjacent adjustment section steel casing 13.

[0057] Another optional connection embodiment is that when the aforementioned standard section steel casing 12 is two (such as Figure 1 As shown in the example), when there are more than one, the annular top surface of the aforementioned first-section steel casing 11 is welded and fixedly connected to the annular bottom surface of the adjacent standard-section steel casing 12, the annular top surface of the standard-section steel casing 12 is welded and fixedly connected to the annular bottom surface of another adjacent standard-section steel casing 12, and the annular top surface of the standard-section steel casing 12 is welded and fixedly connected to the annular bottom surface of the adjacent adjustment-section steel casing 13.

[0058] A further embodiment is that in order to facilitate the welding of each section of steel casing (including the first section steel casing 11, the standard section steel casing 12, and the adjustment section steel casing 13) to each other and enhance the firmness of the connecting surface, the annular top surface of the first section steel casing 11, the annular top surface and annular bottom surface of the standard section steel casing 12, and the annular bottom surface of the adjustment section steel casing 13 can all be set to a flat surface.

[0059] Another optional embodiment is, Figure 1 As shown, the top of the aforementioned steel casing structure 10 is located below or flush with the implementation working surface 302, and the implementation working surface 302 is located a distance below the aforementioned ground line 301, and the top of the buried integrated sewage pumping station 200 is located below the ground line 301.

[0060] The specific steps of an implementation method of applying the above steel casing foundation pit support structure are as follows:

[0061] Step S1, firstly, the pavement structure layer needs to be broken, and the ground line 301 needs to be excavated to the working surface 302;

[0062] Step S2, placing the first section of the steel casing 11 on the implementation working surface 302, applying vertical pressure to the first section of the steel casing 11, pressing the first section of the steel casing 11 into the lower soil, and excavating the soil within the inner range of the steel casing structure 10;

[0063] Step S3, placing the standard section steel casing 12 above the first section steel casing 11, and circumferentially welding the two at the interface, then applying vertical pressure to the standard section steel casing 12, and continuing to press it into the lower unexcavated soil together with the first section steel casing 11, and then excavating the soil within the inner range of the steel casing structure 10 again;

[0064] Step S4, if multiple standard steel casings 12 are used, continue to cycle through the above step S3;

[0065] Step S5, implement to adjust the steel casing 13, place the steel casing 13 above the standard steel casing 12, and weld them circumferentially at the interface between the two, then apply vertical pressure to the steel casing 13, continue to press into the unexcavated soil below, and then excavate the soil within the inner range of the steel casing structure 10 again, at this time, the first steel casing 11 sinks to the required depth;

[0066] Step S6, welding the connecting piece 112 to the inner wall of the lower half of the first section of the steel casing 11;

[0067] Step S7, pouring concrete bottom sealing structure 20;

[0068] Step S8, placing the buried integrated sewage pumping station 200 on the concrete bottom sealing structure 20, and fixing the top surface of the concrete bottom sealing structure 20 and the bottom of the buried integrated sewage pumping station 200 together;

[0069] Step S8, after the implementation of the buried integrated sewage pumping station 200 is completed, the gap between the steel casing structure 10 and the buried integrated sewage pumping station 200 (ie, the backfill space 30) is backfilled with backfill material and restored to the ground elevation.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A steel casing foundation pit support structure for constructing an underground integrated sewage pumping station, characterized in that: include: A steel casing structure, wherein the steel casing structure is formed by a first section steel casing, at least one standard section steel casing and an adjustable section steel casing which are fixedly connected in sequence from bottom to top, and the first section steel casing, at least one standard section steel casing and the adjustable section steel casing are sequentially longitudinally sunk below the ground line, and the inner periphery of the steel casing structure forms a foundation pit, and the foundation pit is used to accommodate an underground integrated sewage pump station; A concrete bottom sealing structure is cast at the bottom of the foundation pit, and the upper part of the concrete bottom sealing structure is fixedly connected to the lower part of the first section of the steel casing located at the bottom of the steel casing structure through concrete solidification, and the top surface of the concrete bottom sealing structure is used for fixed connection with the bottom of the buried integrated sewage pumping station.

2. The steel casing foundation pit support structure according to claim 1 is characterized in that: The bottom edge of the first section of the steel casing is circumferentially arranged in a sawtooth structure with the tooth tips facing downwards.

3. The steel casing foundation pit support structure according to claim 2 is characterized in that: A plurality of connectors extending toward the inner periphery of the steel casing structure are fixedly connected to the inner wall of the lower half of the first section of the steel casing, and the connectors are cast in the upper half of the concrete bottom sealing structure.

4. The steel casing foundation pit support structure according to claim 3 is characterized in that: The connecting piece is formed by connecting steel bars and steel plates; and / or The connecting piece is welded and fixed on the inner wall of the first section of the steel casing.

5. The steel casing foundation pit support structure according to any one of claims 1 to 4, characterized in that: The first-section steel casing, the standard-section steel casing and the adjustment-section steel casing are all thin-walled cylindrical structures.

6. The steel casing foundation pit support structure according to claim 5 is characterized in that: When there is one standard section steel casing, the annular top surface of the first section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent standard section steel casing, and the annular top surface of the standard section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent adjustment section steel casing; When there are two or more standard-section steel casings, the annular top surface of the first-section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent standard-section steel casing, the annular top surface of the standard-section steel casing is welded and fixedly connected to the annular bottom surface of another adjacent standard-section steel casing, and the annular top surface of the standard-section steel casing is welded and fixedly connected to the annular bottom surface of the adjacent adjustment-section steel casing.

7. The steel casing foundation pit support structure according to claim 6 is characterized in that: The annular top surface of the first-section steel casing, the annular top surface and annular bottom surface of the standard-section steel casing, and the annular bottom surface of the adjustment-section steel casing are all set to be flat surfaces.

8. The steel casing foundation pit support structure according to claim 1 is characterized in that: The spacing of the backfill space between the inner wall of the steel casing structure and the periphery of the buried integrated sewage pumping station is greater than or equal to 50 cm.

9. The steel casing foundation pit support structure according to claim 1, characterized in that: The top surface of the concrete bottom sealing structure is fixedly connected to the base at the bottom of the buried integrated sewage pumping station by expansion bolts.

10. The steel casing foundation pit support structure according to claim 1, characterized in that: The top of the steel casing structure is located below or flush with the implementation working surface, the implementation working surface is located a distance below the ground line, and the top of the buried integrated sewage pumping station is located below the ground line.

Images