A steel underground exterior wall structure with support function and construction method

Abstract

The present invention provides a steel underground exterior wall structure and construction method with a supporting function, belonging to the field of building foundation pit technology. The structure includes a steel sheet pile row, a first row of H-shaped steel piles provided on one side of the steel sheet pile row, a second row of H-shaped steel piles provided on one side of the first row of H-shaped steel piles, the second row of H-shaped steel piles connected to the first row of H-shaped steel piles by an H-shaped steel waist beam, the second row of H-shaped steel piles connected to the underground space exterior wall on the side away from the first row of H-shaped steel piles, a basement floor provided on one side of the underground space exterior wall, a first reinforcement connected to the H-shaped steel waist beam, a second reinforcement connected between the H-shaped steel waist beam and the second row of H-shaped steel piles, and the space between the second row of H-shaped steel piles and the steel sheet pile row filled with fine stone concrete. The steel underground exterior wall is a permanent supporting structure, avoiding the waste of temporary support pile walls, reducing the thickness of the underground space exterior wall, reducing the complexity and cost of subsequent construction, improving the utilization efficiency of the structure, and shortening the construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of building foundation pits, and in particular to a steel underground exterior wall structure with a supporting function and a construction method. Background Art

[0002] In traditional underground construction, foundation pit support structures are often used to protect the excavation and underground structure construction, ensuring soil stability and preventing groundwater infiltration. However, these support structures are often left underground after the basement exterior walls are completed, and their support function is neglected, resulting in waste, pollution, and high carbon emissions.

[0003] In recent years, the full-recovery support technology for foundation pits and the permanent support structure for deep foundation pits have developed rapidly, showing the main direction of high-quality development of foundation pits in my country. The full-recovery support technology has solved the problem that the temporary positioning of the foundation pit support structure is not actually temporary; the permanent support structure for deep foundation pits has been used to make the traditional wasteful and usually considered reasonable temporary support pile wall become the main structure and part of it.

[0004] To this end, we propose a steel underground exterior wall structure and construction method with support functions, which can enable the support structure to continue to perform multiple functions such as waterproofing and load-bearing after construction is completed, thereby improving its utilization efficiency, reducing construction costs, and optimizing the project cycle. Summary of the Invention

[0005] The purpose of the present invention is to provide a steel underground exterior wall structure with a supporting function and a construction method to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a steel underground exterior wall structure with a supporting function, comprising a steel sheet pile row, wherein a first row of H-shaped steel piles is provided on one side of the steel sheet pile row, a second row of H-shaped steel piles is provided on a side of the first row of H-shaped steel piles away from the steel sheet pile row, the second row of H-shaped steel piles and the first row of H-shaped steel piles are fixedly connected by an H-shaped steel waist beam, the side of the second row of H-shaped steel piles away from the first row of H-shaped steel piles is fixedly connected to the underground space exterior wall, a side of the underground space exterior wall away from the second row of H-shaped steel piles is fixedly provided with a basement floor slab, a first reinforcement member is fixedly connected to the H-shaped steel waist beam, a second reinforcement member is fixedly connected between the H-shaped steel waist beam and the second row of H-shaped steel piles, and the space area between the side of the second row of H-shaped steel piles away from the first row of H-shaped steel piles and the side of the steel sheet piles close to the first row of H-shaped steel piles is filled with fine stone concrete.

[0008] Furthermore, the steel sheet pile row includes a plurality of steel sheet piles that are sequentially engaged end to end, the first row of H-shaped steel piles includes a plurality of first H-shaped steels, and the first H-shaped steels are spaced apart on the inner side of the steel sheet piles, and the second row of H-shaped steel piles includes a plurality of second H-shaped steels, and the second H-shaped steels are spaced apart, and each second H-shaped steel is arranged opposite to the corresponding first H-shaped steel.

[0009] Furthermore, the first reinforcement member includes a first steel plate and a first wooden board, the first wooden board is fixedly connected to the first steel plate, and the first steel plate is installed on the lower surface of the first wooden board.

[0010] Furthermore, the first steel plate is fixedly arranged between the two side flanges of the H-shaped steel waist beam, the lower surface of the first steel plate is fixedly connected to the web of the H-shaped steel waist beam, and the two side surfaces of the first steel plate are respectively fixedly connected to the inner surfaces of the two side flanges of the H-shaped steel waist beam.

[0011] Furthermore, the second reinforcement member includes a second steel plate and a second wooden board, the second wooden board is fixedly connected to the second steel plate, and the second steel plate is installed on the lower surface of the second wooden board.

[0012] Furthermore, the second steel plate is fixedly arranged between the two second H-shaped steels, the two ends of the second steel plate are respectively fixedly connected to the inner surfaces of the flanges and the webs on both sides of the second H-shaped steels, and one side of the second steel plate is fixedly connected to the outer surface of the flange on one side of the H-shaped steel waist beam.

[0013] The present invention also provides a construction method for a steel underground exterior wall structure with a supporting function, comprising the following steps:

[0014] S1: Preparation before construction: clean the site, level the ground, mark the location of the foundation pit and support structure;

[0015] S2: Foundation pit layout and underground facility detection: Lay out the foundation pit location, confirm the scope of the foundation pit, and use equipment to check surrounding facilities;

[0016] S3: Insert steel sheet piles: Drive steel sheet piles in sequence according to the designed depth, and monitor the verticality and depth of the steel sheet piles in real time during the implementation process;

[0017] S4: Insert the first row of H-beam piles: insert the first H-beam piles in sequence according to the designed depth, and monitor the verticality, depth and spacing of the first H-beam piles in real time during the construction process;

[0018] S5: Insert the second row of H-beam piles: insert the second H-beam piles in sequence according to the designed depth, and monitor the verticality, depth and spacing of the second H-beam piles in real time during the construction process;

[0019] S6: Excavate the foundation pit in sections. After excavating one section, construct the H-shaped steel waist beam, the first reinforcement and the second reinforcement;

[0020] S7: Repeat step S6 until the excavation reaches the bottom of the foundation pit and all components are installed;

[0021] S8: Construction of underground space exterior walls;

[0022] S9: Construction of basement floor;

[0023] S10: Repeat steps S8 and S9 according to the number of basement floors.

[0024] Furthermore, the step S6 specifically includes:

[0025] S61: Install the H-shaped steel waist beam between the first row of H-shaped steel piles and the second row of H-shaped steel piles;

[0026] S62: Fix and install the first reinforcement member and the second reinforcement member at a predetermined position.

[0027] Furthermore, the step S8 specifically includes:

[0028] S81: Base treatment and waterproofing: clean the bottom of the foundation pit and lay a waterproof layer;

[0029] S82: Install exterior wall formwork and reinforcement: Install exterior wall formwork and tie reinforcement;

[0030] S83: Casting fine stone concrete: Cast the fine stone concrete for the exterior wall in layers and vibrate to compact it;

[0031] S84: Curing concrete and removing exterior wall formwork: Curing concrete and removing exterior wall formwork after the concrete strength reaches the required level;

[0032] S85: Foundation pit backfill: Backfill fine stone concrete to the design height of the underground space outer wall to form the underground space outer wall.

[0033] Compared with the prior art, the present invention has the following technical effects:

[0034] In the present invention, the foundation pit support structure composed of steel sheet piles, the first row of H-shaped steel piles, the second row of H-shaped steel piles and the H-shaped steel waist beam is permanently retained in the foundation pit, making it a part of the basement exterior wall, thereby enhancing the waterproofing, load-bearing and anti-seepage capabilities of the basement exterior wall. This steel underground exterior wall is a permanent support structure, which avoids the waste of temporary support pile walls, reduces the thickness of the exterior wall of the underground space, reduces the complexity and cost of subsequent basement exterior wall construction, improves the utilization efficiency of the foundation pit support structure, and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the three-dimensional structure of a steel underground exterior wall structure according to an embodiment of the present invention;

[0036] Figure 2 A schematic top view of a steel underground exterior wall structure according to an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of the installation positions of the first reinforcement member and the second reinforcement member according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the construction of the underground space exterior wall and basement floor slab according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of backfilling fine stone concrete according to an embodiment of the present invention;

[0040] Figure 6 This is a structural diagram of the connection between the first reinforcement member and the H-shaped steel waist beam according to an embodiment of the present invention;

[0041] Figure 7 Schematic diagram of the structure of the second reinforcement member according to an embodiment of the present invention.

[0042] In the figure: 1. Steel sheet piles, 11. Steel sheet piles, 2. First row of H-beam piles, 21. First H-beam, 3. Second row of H-beam piles, 31. Second H-beam, 4. H-beam waist beam, 5. Underground space exterior wall, 6. Fine stone concrete, 7. First reinforcement, 71. First steel plate, 72. First wooden board, 8. Second reinforcement, 81. Second steel plate, 82. Second wooden board, 9. Basement floor. DETAILED DESCRIPTION

[0043] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] In this article, terms such as "left, right, up, down, front, and back" are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection.

[0045] See also Figures 1 to 7This embodiment provides a steel underground exterior wall structure with a supporting function, comprising a steel sheet pile row 1. A first row of H-beam steel piles 2 are provided on one side of the steel sheet pile row 1. A second row of H-beam steel piles 3 are provided on the side of the first row of H-beam steel piles 2 facing away from the steel sheet pile row 1. The second row of H-beam steel piles 3 are fixedly connected to the first row of H-beam steel piles 2 via a plurality of H-beam steel waist beams 4. An underground space exterior wall 5 is fixedly connected to the side of the second row of H-beam steel piles 3 facing away from the first row of H-beam steel piles 2. The function of the underground space exterior wall 5 is to bear only vertical loads. A basement floor slab 9 is fixedly provided on the side of the underground space exterior wall 5 facing away from the second row of H-beam steel piles 3. The thickness of the underground space exterior wall 5 is t, and the overlap length of the basement floor slab 9 is t, which is approximately 200 mm. A first reinforcement 7 is fixedly connected to the H-shaped steel waist beam 4, and a second reinforcement 8 is fixedly connected between the H-shaped steel waist beam 4 and the second row of H-shaped steel piles 3. The space area between the side of the second row of H-shaped steel piles 3 away from the first row of H-shaped steel piles 2 and the side of the steel sheet pile row 1 close to the first row of H-shaped steel piles 2 is filled with fine stone concrete 6.

[0046] Specifically, this steel underground exterior wall structure permanently retains the foundation pit support structure composed of steel sheet piles 1, the first row of H-shaped steel piles 2, the second row of H-shaped steel piles 3 and the H-shaped steel waist beam 4 in the foundation pit, making it a part of the basement exterior wall, thereby enhancing the waterproofing, load-bearing and anti-seepage capabilities of the basement exterior wall. This steel underground exterior wall is a permanent support structure, which avoids the waste of temporary support pile walls, reduces the thickness of the underground space exterior wall 5, reduces the complexity and cost of subsequent basement exterior wall construction, improves the utilization efficiency of the foundation pit support structure, and shortens the construction period.

[0047] Specifically, the steel sheet pile row 1 includes a plurality of steel sheet piles 11 vertically driven into the soil, and the steel sheet piles 11 are sequentially engaged end to end, such as Figure 2 As shown, the steel sheet piles 11 with openings facing the same direction are spaced apart along the longitudinal direction of the foundation pit, and the spacing distance is recorded as R. In this embodiment, the longitudinal direction of the foundation pit is Figure 2 The left and right directions are shown. The first row of H-beam piles 2 includes a plurality of first H-beams 21 driven vertically into the soil. The first H-beams 21 are arranged on the inner side of the steel sheet piles 11, and the first H-beams 21 are spaced apart along the longitudinal direction of the foundation pit at a spacing of 2R. The second row of H-beam piles 3 includes a plurality of second H-beams 31 driven vertically into the soil. The second H-beams 31 are spaced apart along the longitudinal direction of the foundation pit at a spacing of 2R, and each second H-beam 31 is arranged opposite to the corresponding first H-beam 21. Figure 2 As shown, the second row of H-beam piles 3 and the first row of H-beam piles 2 are spaced apart in the transverse direction of the foundation pit, with a spacing distance D ranging from 1800 to 2000 mm, i.e., the distance between the first H-beam 21 and the second H-beam 31 in the transverse direction of the foundation pit. Figure 2 As shown in the up and down direction. Figure 3As shown, the H-shaped steel waist beam 4 between the second row of H-shaped steel piles 3 and the first row of H-shaped steel piles 2 is installed along the longitudinal direction of the foundation pit. The flange on one side of the H-shaped steel waist beam 4 is fixedly connected to the flange of the first H-shaped steel 21, and the flange on the other side of the H-shaped steel waist beam 4 is fixedly connected to the flange of the second H-shaped steel 31. In this embodiment, the connection method of the H-shaped steel waist beam 4 and the first H-shaped steel 21 and the second H-shaped steel 31 is welding.

[0048] Specifically, the first reinforcement 7 and the second reinforcement 8 are both composed of steel plates and wooden boards. The first reinforcement 7 includes a first steel plate 71 and a first wooden board 72. The first wooden board 72 is fixedly connected to the first steel plate 71, and the first steel plate 71 is installed on the lower surface of the first wooden board 72. In this embodiment, the first wooden board 72 and the first steel plate 71 are fixed by bolts. The first reinforcement 7 is fixedly installed between the two side flanges of the H-shaped steel waist beam 4. When the first reinforcement 7 is installed, the first wooden board 72 is on top and the first steel plate 71 is on the bottom. The lower surface of the first steel plate 71 is fixedly connected to the web of the H-shaped steel waist beam 4. The two side surfaces of the first steel plate 71 are respectively fixedly connected to the inner surfaces of the two side flanges of the H-shaped steel waist beam 4. In this embodiment, the first reinforcement 7 is connected to the H-shaped steel waist beam 4 by welding.

[0049] Specifically, the second reinforcement 8 includes a second steel plate 81 and a second wooden board 82. The second wooden board 82 is fixedly connected to the second steel plate 81. The second steel plate 81 is installed on the lower surface of the second wooden board 82. In this embodiment, the second wooden board 82 and the second steel plate 81 are fixed by bolts. The second reinforcement 8 is fixedly installed between the second H-beams 31 of the second row of H-beam piles 3. Several second reinforcements 8 are installed between each two second H-beams 31. When the second reinforcement 8 is installed, the two ends of the second steel plate 81 are fixedly connected to the inner surface of the flanges and the web on both sides of the second H-beam 31. One side of the second steel plate 81 is fixedly connected to the lower half of the outer surface of the flange on one side of the H-beam waist beam 4. In this embodiment, the second reinforcement 8 is connected to the second H-beam 31 and the H-beam waist beam 4 by welding.

[0050] Specifically, the first reinforcement member 7 and the second reinforcement member 8 not only play the role of reinforcing the supporting structure, but also can serve as a construction platform for construction workers when constructing the outer wall 5 of the underground space, providing an operating space for the construction workers.

[0051] This embodiment also provides a construction method for a steel underground exterior wall structure with a supporting function, comprising the following steps:

[0052] S1: Pre-construction preparation: Clean the site, level the ground, and check the equipment and materials used to ensure they meet the design requirements. Then use tools such as laser levels and total stations to accurately calibrate the positions of the foundation pit and the fully recoverable support structure.

[0053] S2: Foundation pit layout and underground facility detection: Accurately lay out the foundation pit location, confirm the scope of the foundation pit, and use underground pipeline detectors to check surrounding facilities.

[0054] S3: Inserting steel sheet piles 1: Use a crawler pile driver to drive the steel sheet piles 11 in sequence according to the designed depth. During the construction process, monitor the verticality and depth of the steel sheet piles 11 in real time to ensure that the pile body is vertical and the depth complies with the regulations.

[0055] S4: Insert the first row of H-beam piles 2: Use a total station to locate the installation position of the first row of H-beam piles 2, and then use a crawler pile driver to insert the first H-beam 21 in sequence according to the designed depth. During the construction process, the verticality, depth and spacing of the first H-beam 21 are monitored in real time to ensure that the pile body is vertical, the depth is compliant, and the spacing meets the standards.

[0056] S5: Insert the second row of H-beam piles 3: Use a total station to locate the installation position of the second row of H-beam piles 3, and then use a crawler pile driver to insert the second H-beam 31 in sequence according to the designed depth. During the construction process, the verticality, depth and spacing of the second H-beam 31 are monitored in real time to ensure that the pile body is vertical, the depth is compliant, and the spacing meets the standards.

[0057] S6: Excavate the foundation pit in sections. After excavating one section, construct the H-shaped steel waist beam 4, the first reinforcement 7 and the second reinforcement 8.

[0058] Specifically, step S6 includes:

[0059] S61: Use a total station for precise positioning, and use a crawler crane to place the H-beam waist beam 4 laterally between the first row of H-beam piles 2 and the second row of H-beam piles 3. After ensuring that the horizontality of the H-beam waist beam 4 meets the requirements, weld the H-beam waist beam 4 to the first row of H-beam piles 2 and the second row of H-beam piles 3.

[0060] S62: Weld the first reinforcement member 7 and the second reinforcement member 8 at predetermined positions to ensure welding quality.

[0061] S7: Repeat step S6 until the excavation reaches the bottom of the foundation pit and all components are welded.

[0062] S8: Construction of underground space exterior wall 5.

[0063] Specifically, step S8 includes:

[0064] S81: Base treatment and waterproofing: clean the bottom of the foundation pit and lay a waterproof layer;

[0065] S82: Install exterior wall formwork and reinforcement: Install exterior wall formwork and tie reinforcement;

[0066] S83: Casting fine stone concrete 6: Cast the exterior wall fine stone concrete 6 in layers and vibrate to compact it;

[0067] S84: Curing concrete and removing exterior wall formwork: Curing concrete and removing exterior wall formwork after the concrete strength reaches the required level;

[0068] S85: Backfilling the foundation pit: backfilling the fine stone concrete 6 to the design height of the underground space outer wall 5 to form the underground space outer wall 5.

[0069] S9: Construction of basement floor slab 9.

[0070] S10: Repeat steps S8 and S9 according to the number of basement floors until the construction is completed.

[0071] The above embodiments merely illustrate the basic principles and features of the present invention and are not intended to be limiting. It should be understood that various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and such changes and modifications are intended to fall within the scope of the present invention as claimed. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel underground exterior wall structure with a supporting function, characterized in that: The invention comprises a steel sheet pile row (1), wherein a first row of H-shaped steel piles (2) is provided on one side of the steel sheet pile row (1), a second row of H-shaped steel piles (3) is provided on a side of the first row of H-shaped steel piles (2) away from the steel sheet pile row (1), the second row of H-shaped steel piles (3) is fixedly connected to the first row of H-shaped steel piles (2) via an H-shaped steel waist beam (4), the second row of H-shaped steel piles (3) is fixedly connected to an outer wall (5) of an underground space on a side away from the first row of H-shaped steel piles (2), and the outer wall (5) of the underground space is fixedly connected to the outer wall (5) of the underground space. A basement floor slab (9) is fixedly provided on a side of the wall (5) away from the second row of H-shaped steel piles (3); a first reinforcement member (7) is fixedly connected to the H-shaped steel waist beam (4); a second reinforcement member (8) is fixedly connected between the H-shaped steel waist beam (4) and the second row of H-shaped steel piles (3); and a space area between a side of the second row of H-shaped steel piles (3) away from the first row of H-shaped steel piles (2) and a side of the steel sheet piles (1) close to the first row of H-shaped steel piles (2) is filled with fine stone concrete (6); The steel sheet pile row (1) comprises a plurality of steel sheet piles (11) that are sequentially joined end to end; the first row of H-shaped steel piles (2) comprises a plurality of first H-shaped steels (21) that are arranged at intervals on the inner side of the steel sheet piles (11); the second row of H-shaped steel piles (3) comprises a plurality of second H-shaped steels (31) that are arranged at intervals, and each second H-shaped steel (31) is arranged opposite to the corresponding first H-shaped steel (21).

2. The steel underground exterior wall structure with supporting function according to claim 1, characterized in that: The first reinforcement member (7) comprises a first steel plate (71) and a first wooden board (72), the first wooden board (72) being fixedly connected to the first steel plate (71), and the first steel plate (71) being mounted on the lower surface of the first wooden board (72).

3. The steel underground exterior wall structure with supporting function according to claim 2, characterized in that: The first steel plate (71) is fixedly arranged between the two side flanges of the H-shaped steel waist beam (4), the lower surface of the first steel plate (71) is fixedly connected to the web of the H-shaped steel waist beam (4), and the two side surfaces of the first steel plate (71) are respectively fixedly connected to the inner surfaces of the two side flanges of the H-shaped steel waist beam (4).

4. The steel underground exterior wall structure with supporting function according to claim 1, characterized in that: The second reinforcement member (8) comprises a second steel plate (81) and a second wooden board (82), the second wooden board (82) being fixedly connected to the second steel plate (81), and the second steel plate (81) being mounted on the lower surface of the second wooden board (82).

5. The steel underground exterior wall structure with supporting function according to claim 4, characterized in that: The second steel plate (81) is fixedly arranged between the two second H-shaped steels (31), and the two ends of the second steel plate (81) are respectively fixedly connected to the inner surfaces of the flanges and the webs on both sides of the second H-shaped steel (31), and one side of the second steel plate (81) is fixedly connected to the outer surface of the flange on one side of the H-shaped steel waist beam (4).

6. A construction method using the steel underground exterior wall structure with a supporting function according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Preparation before construction: clean the site, level the ground, mark the location of the foundation pit and support structure; S2: Foundation pit layout and underground facility detection: Lay out the foundation pit location, confirm the scope of the foundation pit, and use equipment to check surrounding facilities; S3: Inserting steel sheet piles (1): driving the steel sheet piles (11) in sequence according to the designed depth, and monitoring the verticality and depth of the steel sheet piles (11) in real time during the implementation process; S4: Inserting the first row of H-beam piles (2): inserting the first H-beam (21) in sequence according to the designed depth, and monitoring the verticality, depth and spacing of the first H-beam (21) in real time during the construction process; S5: Inserting the second row of H-beam piles (3): inserting the second H-beam (31) in sequence according to the designed depth, and monitoring the verticality, depth and spacing of the second H-beam (31) in real time during the construction process; S6: Excavate the foundation pit in sections, and after excavating one section, construct the H-shaped steel waist beam (4), the first reinforcement (7) and the second reinforcement (8); S7: Repeat step S6 until the excavation reaches the bottom of the foundation pit and all components are installed; S8: Construction of underground space exterior wall (5); S9: Construction of basement floor (9); S10: Repeat steps S8 and S9 according to the number of basement floors.

7. The construction method of the steel underground exterior wall structure with supporting function according to claim 6, characterized in that: The step S6 specifically includes: S61: The H-shaped steel waist beam (4) is fixedly installed between the first row of H-shaped steel piles (2) and the second row of H-shaped steel piles (3); S62: The first reinforcement member (7) and the second reinforcement member (8) are fixedly installed at predetermined positions.

8. The construction method of the steel underground exterior wall structure with supporting function according to claim 6, characterized in that: The step S8 specifically includes: S81: Base treatment and waterproofing: clean the bottom of the foundation pit and lay a waterproof layer; S82: Install exterior wall formwork and reinforcement: Install exterior wall formwork and tie reinforcement; S83: pouring fine stone concrete (6): pouring the outer wall fine stone concrete (6) in layers and vibrating to compact it; S84: Curing concrete and removing exterior wall formwork: Curing concrete and removing exterior wall formwork after the concrete strength reaches the required level; S85: Backfill the foundation pit: Backfill fine stone concrete (6) to the design height of the underground space outer wall (5) to form the underground space outer wall (5).

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