Construction method of subway station foundation pit side wall
By using steel mesh and tie rods for marking and positioning during the construction of the side walls of subway station foundation pits, the problem of difficult formwork positioning caused by uneven working surfaces of retaining piles was solved, and high-precision flatness construction of the side walls was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- RAILWAY NO 5 BUREAU GRP FIRST ENG CO LTD
- Filing Date
- 2023-01-10
- Publication Date
- 2026-07-24
AI Technical Summary
During the pouring of the side wall of the subway station foundation pit, the unevenness of the working surface of the retaining piles made it difficult to position the pouring formwork, affecting the flatness of the side wall.
By laying steel mesh as a reference and painting marks at equal intervals on the tie rods, the sub-formwork is positioned and poured using the painted marks. Combined with locking parts and support components, the formwork is accurately positioned and fixed.
This achieved high-precision flatness after the sidewall was poured, ensuring the construction quality of the sidewall.
Smart Images
Figure CN116005717B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of subway station foundation pit construction, and more specifically to a construction method for the side wall of a subway station foundation pit. Background Technology
[0002] During the construction of the sidewalls in a subway station foundation pit, it is usually necessary to first remove part of the concrete between the piles and the surface concrete of the retaining piles to form the working surface for the retaining piles. Concrete is then poured between the working surface and the formwork to form the sidewall. Because the working surface for the retaining piles needs to expose part of the retaining piles, it is uneven. When setting up the formwork, it is impossible to use the working surface as a reference for positioning the formwork, which may affect the flatness of the sidewall after it is poured. Summary of the Invention
[0003] To address the aforementioned technical problems, this invention provides a construction method for the sidewall of a subway station foundation pit, the specific technical solution of which is as follows.
[0004] A construction method for the sidewall of a subway station foundation pit includes the following steps:
[0005] S1. Excavation of the working face of the retaining piles, chiseling away part of the concrete between the piles and the surface concrete of the retaining piles, so that part of the retaining piles are exposed.
[0006] S2. Arrange tie rods in an array and fix them to the retaining piles so that the axial direction of the tie rods is perpendicular to the working surface of the retaining piles.
[0007] S3. Lay the steel mesh and tie it to the tie rods to form a flat surface; using the flat surface as a reference, paint markings at equal intervals on each tie rod to form a marking surface;
[0008] S4. Pass the tie rods through the casting sub-formwork and fix each casting sub-formwork with the paint mark as a reference; lock the adjacent casting sub-formwork; install the support components on the side of the casting sub-formwork away from the retaining piles, and fix the support components to the bottom of the pit to support the casting sub-formwork.
[0009] S5. Concrete shall be poured in horizontal layers, with each layer not exceeding 1m in thickness. After each layer of concrete is poured, a small vibrator shall be inserted into the pouring hole for vibration, and then the outside of the pouring formwork shall be tapped with a hammer for compaction.
[0010] S6. Remove the formwork after the concrete reaches the required strength for demolding.
[0011] Furthermore, in step S2, a hole is first drilled in a direction parallel to the working surface of the retaining pile, then a rebar is inserted into the hole and a portion of the rebar is reserved outside the hole; then the 90-degree hook rebar is welded to the reserved portion of the rebar, and the tie rod is welded to the 90-degree hook rebar, so that the tie rod is perpendicular to the working surface of the retaining pile.
[0012] Furthermore, the casting sub-formwork includes a panel, integrally formed surrounding panels, and locking handles; multiple sets of crisscrossing reinforcing ribs are provided between the surrounding panels, and pre-drilled holes penetrating the panel are provided at the intersections of the reinforcing ribs, and the tie rods pass through the pre-drilled holes and are locked to the casting sub-formwork; the locking handle includes a handle, a locking rod, and a locking head; the handle is connected to one end of the locking rod to form an L-shape; the locking head includes two limiting blocks symmetrically arranged along the axis of the locking rod, and the limiting blocks are connected to the other end of the locking rod; the surrounding panels are provided with elliptical holes, and the locking rod passes through the elliptical holes of two adjacent surrounding panels and rotates 90 degrees to lock the two casting sub-modules.
[0013] Furthermore, the circumference of the reserved hole is provided with a first ring body protruding towards the side away from the panel, and a second ring body is surrounded by the first ring body. The second ring body is connected to the reinforcing rib, and an annular gap is formed between the second ring body and the first ring body; the tie rod is locked to the casting sub-template by a locking member.
[0014] The locking component includes a first locking body and a second locking body. The first locking body has a threaded through hole that mates with a pull screw. The second locking body has a locking through hole that accommodates a first ring body, and the first locking body and the second locking body are rotatably connected relative to each other. The radial cross-section of the locking through hole is a first ellipse. The radial cross-section of the outer contour of the first ring body is a second ellipse. A rubber locking body of equal thickness is attached to the inner wall of the second locking body. The sum of the major axis length of the second ellipse and twice the thickness of the rubber locking body is greater than the minor axis length of the first ellipse and less than the major axis length of the first ellipse.
[0015] The process of locking the tie rod to the casting formwork includes:
[0016] The tie rod is passed through the reserved hole, and the end face of the first ring body is aligned with the paint mark to position the cast sub-formwork;
[0017] The first locking body is rotated so that its end face abuts against the end face of the first ring body. During the rotation of the first locking body, before the end face of the second locking body coincides with the end face of the first ring body, the major axis of the first ellipse is aligned with the major axis of the second ellipse, and the second locking body is limited so that it cannot rotate. When the end face of the first locking body abuts against the end face of the first ring body, the second locking body is rotated so that the minor axis of the first ellipse is aligned with the major axis of the second ellipse.
[0018] Furthermore, the outer wall of the first ring body is provided with a plurality of annular toothed grooves arranged in the axial direction; the inner wall of the rubber locking body is provided with a plurality of annular toothed racks arranged in the axial direction; the annular toothed racks are inserted into the annular toothed grooves.
[0019] Furthermore, the major axis of the first ellipse is 75mm and the minor axis is 65mm; the major axis of the second ellipse is 50mm and the minor axis is 40mm; and the thickness of the rubber locking body is 10mm.
[0020] Furthermore, the support assembly includes support sub-assemblies that correspond one-to-one with the cast-in-place sub-formwork; each support sub-assembly includes a support section and a tie rod; the support section is connected to the cast-in-place sub-formwork, and one end of the tie rod is connected to the support section, while the other end is anchored to the bottom of the foundation pit.
[0021] Furthermore, the support section includes two parallel horizontal plates and a vertical rod connecting the horizontal plates; a truss structure is provided between the vertical rods; and adjacent support sections are detachably connected.
[0022] Furthermore, the vertical rod is connected to the reinforcing rib via a right-angle plate.
[0023] Furthermore, when fixing the sub-formwork, fix it layer by layer from bottom to top; for each layer of sub-formwork, first lock the tie rods and the sub-formwork, then fix the support section, and finally fix the diagonal tie rod; after installing the sub-formwork and the corresponding support components, install the next sub-formwork.
[0024] Beneficial effects: The construction method for the side wall of a subway station foundation pit provided by the present invention uses a steel mesh as a reference and paints markings at equal intervals on the tie rods. The painting marks are used as a reference to install each pouring sub-formwork, ensuring the positioning accuracy of the pouring sub-formwork and thus ensuring the flatness of the side wall after pouring. Attached Figure Description
[0025] Figure 1 This is a flowchart illustrating the construction method.
[0026] Figure 2 This is a schematic diagram showing the result after the steel mesh has been laid.
[0027] Figure 3 This is a schematic diagram showing the installation of the sub-formwork and support components after casting.
[0028] Figure 4 This is a schematic diagram showing the connection between two adjacent casting sub-formworks;
[0029] Figure 5 This is a diagram illustrating how to lock the handle.
[0030] Figure 6 for Figure 4 Enlarged view of region A in the middle;
[0031] Figure 7 This is an axial sectional view of the locking component and the first ring body;
[0032] Figure 8 This is a radial cross-sectional view of the second locking body before it is fastened to the first ring body;
[0033] Figure 9 This is a radial cross-sectional view of the second locking body after it is fastened to the first ring body;
[0034] Figure 10 This is a schematic diagram showing the connection between the support section and the pouring sub-formwork;
[0035] Figure 11 for Figure 2 A magnified view of region B in the middle.
[0036] Attached reference numerals: 1. Working face of retaining pile; 2. Tie rod; 3. Steel mesh; 4. Casting sub-formwork; 5. Support section; 6. Diagonal tie rod; 7. Locking device;
[0037] 21. Rebar installation; 22. Hooked rebar;
[0038] 41. Panel; 42. Enclosure; 43. Locking handle; 44. Reinforcing rib; 45. Pre-drilled hole; 46. First ring; 47. Second ring; 48. Oval hole;
[0039] 431. Handle; 432. Locking rod; 433. Limiting block; 434. Locking block;
[0040] 51. Horizontal plate; 52. Vertical rod; 53. Truss structure; 54. Right-angle plate;
[0041] 71. First locking body; 72. Second locking body; 73. Slide groove; 74. Slider; 75. First ellipse; 76. Second ellipse; 77. Rubber locking body; 78. Annular toothed groove; 79. Annular toothed rack. Detailed Implementation
[0042] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0044] Example
[0045] Reference Figure 1 As shown in the figure, this embodiment provides a construction method for the sidewall of a subway station foundation pit, including the following steps:
[0046] S1. Excavation of the working face 1 of the retaining piles, chiseling away part of the concrete between the piles and the surface concrete of the retaining piles, so that part of the retaining piles are exposed.
[0047] S2. Arrange tie rods 2 in an array and fix them to the retaining piles so that the axial direction of the tie rods 2 is perpendicular to the working surface 1 of the retaining piles.
[0048] S3. Lay the steel mesh 3 and tie the steel mesh 3 to the tie rod 2 to form a flat surface; use the flat surface as a reference to paint markings at equal intervals on each tie rod 2 to form a marking surface;
[0049] S4. Pass the tie rod 2 through the casting sub-formwork 4 and fix each casting sub-formwork 4 with the paint mark as a reference; lock the adjacent casting sub-formwork 4; install the support component on the side of the casting sub-formwork 4 away from the retaining pile, and fix the support component to the bottom of the foundation pit to support the casting sub-formwork 4.
[0050] S5. Concrete shall be poured in horizontal layers, with each layer not exceeding 1m in thickness. After each layer of concrete is poured, a small vibrator shall be inserted into the pouring hole for vibration, and then a hammer shall be used to tap the outside of the pouring sub-formwork 4 for compaction.
[0051] S6. Remove the formwork after the concrete reaches the required strength for demolding.
[0052] The construction method of the side wall of the subway station foundation pit provided in this embodiment uses the laying of steel mesh 3 as a reference and paint marks at equal intervals on the tie rods 2. The paint marks are used as a reference to install each pouring sub-formwork 4 to ensure the positioning accuracy of the pouring sub-formwork 4, thereby ensuring the flatness of the side wall after pouring.
[0053] Specifically, in step S2, refer to Figure 11 As shown, first, holes are drilled parallel to the working surface 1 of the retaining pile, then rebar 21 is inserted into the holes, with a portion of rebar 21 reserved outside the holes; then, 90-degree hook rebar 22 is welded to the reserved portion of the rebar 21, and tie rod 2 is welded to the 90-degree hook rebar 22, so that tie rod 2 is perpendicular to the working surface 1 of the retaining pile. Drilling holes and inserting rebar 21 on the side of the retaining pile facilitates construction and enhances its stability.
[0054] Specifically, in step 3, multiple steel mesh sheets 3 are prefabricated in the factory. When laying the steel mesh sheets 3, they are arranged at intervals of 150mm × 200mm and then tied together. A schematic diagram showing the completed tying process is provided below. Figure 2 As shown.
[0055] Specifically, in step S4, the casting sub-formwork 4 is installed layer by layer from bottom to top. Each layer of casting sub-formwork 4 corresponds to a support sub-component. After each casting sub-formwork 4 is fixed, the corresponding support sub-component is immediately installed. (Refer to...) Figure 4 As shown, the casting sub-formwork 4 includes a panel 41, a surrounding panel 42 integrally formed around the panel 41, and a locking handle 43; multiple sets of crisscrossing reinforcing ribs 44 are provided between the surrounding panels 42, and a reserved hole 45 penetrating the panel 41 is provided at the intersection of the reinforcing ribs 44; the tie rod 2 passes through the reserved hole 45 and is locked to the casting sub-formwork 4; see reference Figure 5 As shown, the locking handle 43 includes a handle 431, a locking rod 432, and a locking head; the handle 431 is connected to one end of the locking rod 432 to form an L-shape; the locking head includes two limiting blocks 433 symmetrically arranged along the axis of the locking rod 432, and the limiting blocks 433 are connected to the other end of the locking rod 432; the enclosure plate 42 is provided with an elliptical hole 48, and the locking rod 432 passes through the elliptical hole 48 of two adjacent enclosure plates 42 and rotates 90 degrees to lock the two casting sub-modules.
[0056] By rotating the locking handle 43, the limiting block 433 rotates 90 degrees and abuts against both sides of the elliptical hole 48, thereby locking the two adjacent cast-in-place sub-formworks 4. The operation is simple and convenient, and the construction efficiency is high. In order to facilitate the rotation of the operating handle 431 and better lock, a locking block 434 is also provided at the end of the locking rod 432 connected to the handle 431. The locking block 434 abuts against the surrounding plate 42, and the length of the locking rod 432 is equal to the thickness of the two surrounding plates 42.
[0057] Specifically, refer to Figure 6 As shown, a first ring 46 protruding toward the side away from the panel 41 is provided on the circumference of the reserved hole 45. A second ring 47 is surrounded around the first ring 46. The second ring 47 is connected to the reinforcing rib 44, and an annular gap is formed between the second ring 47 and the first ring 46. The tie rod 2 is locked to the casting sub-template 4 by the locking member 7.
[0058] Reference Figure 7 As shown, the locking component 7 includes a first locking body 71 and a second locking body 72. The first locking body 71 has a threaded through hole that mates with the pull screw 2. The second locking body 72 has a locking through hole that accommodates the passage of the first ring 46. The first locking body 71 and the second locking body 72 are rotatably connected. Specifically, a T-shaped annular groove 73 with an axial cross-section can be provided at the end of the first locking body 71, and a T-shaped annular slider 74 with an axial cross-section can be provided on the end face of the second locking body 72, thereby achieving a rotatable connection. The radial cross-section of the locking through hole is a first ellipse 75; the radial cross-section of the outer contour of the first ring 46 is a second ellipse 76; a rubber locking body 77 of equal thickness is attached to the inner wall of the second locking body 72; the sum of the major axis length of the second ellipse 76 and twice the thickness of the rubber locking body 77 is greater than the minor axis length of the first ellipse 75 and less than the major axis length of the first ellipse 75.
[0059] The process of locking the tie rod 432 to the casting sub-formwork 4 includes:
[0060] The tie rod 2 is passed through the reserved hole 45, and the end face of the first ring body 46 is aligned with the paint mark to position the casting sub-formwork 4;
[0061] Rotate the first locking body 71 until its end face abuts against the end face of the first ring body 46; during the rotation of the first locking body 71, before the end face of the second locking body 72 coincides with the end face of the first ring body 46, align the major axis of the first ellipse 75 with the major axis of the second ellipse 76, and limit the second locking body 72 so that it cannot rotate, its state is referred to Figure 8 As shown; when the end face of the first locking body 71 abuts against the end face of the first ring body 46, the second locking body 72 is rotated so that the minor axis of the first ellipse 75 is aligned with the major axis of the second ellipse 76, as shown in the figure. Figure 9 As shown, the second locking body 72 is used to press the rubber locking member 7 in the direction of the minor axis of the first ellipse 75, thereby achieving the fastening of the second locking body 72 and the first ring body 46.
[0062] After the sub-formwork 4 is positioned using painted markings, it is locked to the first ring 46 by the second locking body 72, thereby pre-locking the sub-formwork 4. This prevents the sub-formwork 4 from shifting towards the retaining pile working surface 1 during the installation of the corresponding support sub-components, thus further ensuring the flatness of the sidewall after pouring. Furthermore, the second locking body 72, fitted onto the first ring 46, prevents grout overflow at the pre-drilled hole 45 during pouring.
[0063] Specifically, refer to Figure 6 As shown, the outer wall of the first ring body 46 is provided with a plurality of annular toothed grooves 78 arranged in the axial direction; the inner wall of the rubber locking body 77 is provided with a plurality of annular toothed racks 79 arranged in the axial direction; at this time, the second locking body 72 is not locked with the first ring body 46, and there is a gap between the annular toothed racks 79 and the annular toothed grooves 78, which facilitates axial movement when the first locking body 71 is locked with the pull lock rod 432; when the second locking body 72 is locked with the first ring body 46, since the minor axis of the first ellipse is aligned with the major axis of the second ellipse, the rubber locking body 77 is squeezed, causing the annular toothed racks 79 to insert into the annular toothed grooves 78, further reinforcing the second locking body 72 and the first ring body 46 and improving the firmness.
[0064] Specifically, the major axis of the first ellipse 75 is 75mm and the minor axis is 65mm; the major axis of the second ellipse 76 is 50mm and the minor axis is 40mm; and the thickness of the rubber locking body 77 is 10mm. When the minor axis of the first ellipse 75 is aligned with the major axis of the second ellipse 76, the gap width is 7.5mm, and the rubber locking body 77 is deformed by compression to achieve locking.
[0065] Specifically, the support assembly includes support sub-assemblies that correspond one-to-one with the pouring sub-formwork 4; the support sub-assemblies include support sections 5 and diagonal tie rods 6; the support sections 5 are connected to the pouring sub-formwork 4, one end of the diagonal tie rod 6 is connected to the support section 5, and the other end is anchored to the bottom of the foundation pit.
[0066] Reference Figure 10 As shown, the support section 5 includes two parallel horizontal plates 51 and vertical rods 52 connected between the horizontal plates 51; a truss structure 53 is provided between the vertical rods 52; two vertically adjacent support sections 5 are connected by bolts. The vertical rods 52 are connected to the reinforcing ribs 44 of the cast-in-place sub-formwork 4 by right-angle plates 54, so that one side of the right-angle plate 54 is bolted to the vertical rod 52 and the other side is bolted to the reinforcing ribs 44.
[0067] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, achieving the same performance or purpose, should be considered within the scope of protection of the present invention.
Claims
1. A construction method for the sidewall of a subway station foundation pit, characterized in that, Includes the following steps: S1. Excavation of the working face of the retaining piles, chiseling away part of the concrete between the piles and the surface concrete of the retaining piles, so that part of the retaining piles are exposed. S2. Arrange tie rods in an array and fix them to the retaining piles so that the axial direction of the tie rods is perpendicular to the working surface of the retaining piles. S3. Lay the steel mesh and tie it to the tie rods to form a flat surface; using the flat surface as a reference, paint markings at equal intervals on each tie rod to form a marking surface; S4. Pass the tie rods through the casting sub-formwork and fix each casting sub-formwork with the painted marks as a reference; lock adjacent casting sub-formworks; install support components on the side of the casting sub-formwork away from the retaining piles, and fix the support components to the bottom of the foundation pit to support the casting sub-formwork; the casting sub-formwork includes a panel and a surrounding plate integrally formed around the panel; multiple sets of horizontal and vertical reinforcing ribs are provided between the surrounding plates, and a reserved hole penetrating the panel is provided at the intersection of the reinforcing ribs; the tie rods pass through the reserved holes and are locked to the casting sub-formwork; a first ring body protruding towards the side away from the panel is provided on the circumference of the reserved hole, and a second ring body is surrounded by the first ring body; the second ring body is connected to the reinforcing ribs, and an annular gap is formed between the second ring body and the first ring body; the tie rods are locked to the casting sub-formwork by locking components; The locking component includes a first locking body and a second locking body. The first locking body has a threaded through hole that mates with a pull screw. The second locking body has a locking through hole that accommodates a first ring body, and the first locking body and the second locking body are rotatably connected relative to each other. The radial cross-section of the locking through hole is a first ellipse. The radial cross-section of the outer contour of the first ring body is a second ellipse. A rubber locking body of equal thickness is attached to the inner wall of the second locking body. The sum of the major axis length of the second ellipse and twice the thickness of the rubber locking body is greater than the minor axis length of the first ellipse and less than the major axis length of the first ellipse. The process of locking the tie rod to the casting formwork includes: The tie rod is passed through the reserved hole, and the end face of the first ring body is aligned with the paint mark to position the cast sub-formwork; The first locking body is rotated so that its end face abuts against the end face of the first ring body. During the rotation of the first locking body, before the end face of the second locking body coincides with the end face of the first ring body, the major axis of the first ellipse is aligned with the major axis of the second ellipse, and the second locking body is limited so that it cannot rotate. When the end face of the first locking body abuts against the end face of the first ring body, the second locking body is rotated so that the minor axis of the first ellipse is aligned with the major axis of the second ellipse. S5. Concrete shall be poured in horizontal layers, with each layer not exceeding 1m in thickness. After each layer of concrete is poured, a small vibrator shall be inserted into the pouring hole for vibration, and then a hammer shall be used to tap the outside of the pouring formwork for compaction. S6. Remove the formwork after the concrete reaches the required strength for demolding.
2. The construction method for the side wall of a subway station foundation pit according to claim 1, characterized in that, In step S2, a hole is first drilled in a direction parallel to the working surface of the retaining pile, then a rebar is inserted into the hole and a portion of the rebar is reserved outside the hole; then the 90-degree hook rebar is welded to the reserved portion of the rebar, and the tie rod is welded to the 90-degree hook rebar, so that the tie rod is perpendicular to the working surface of the retaining pile.
3. The construction method for the side wall of a subway station foundation pit according to claim 2, characterized in that, The casting sub-formwork also includes a locking handle; the locking handle includes a handle, a locking rod, and a locking head; the handle is connected to one end of the locking rod to form an L-shape; the locking head includes two limiting blocks symmetrically arranged along the axis of the locking rod, and the limiting blocks are connected to the other end of the locking rod; the surrounding plate is provided with an elliptical hole, and the locking rod passes through the elliptical hole of two adjacent surrounding plates and rotates 90 degrees to lock the two casting sub-modules.
4. The construction method for the side wall of a subway station foundation pit according to claim 3, characterized in that, The outer side wall of the first ring body is provided with a plurality of annular toothed grooves arranged in the axial direction; the inner side wall of the rubber locking body is provided with a plurality of annular toothed racks arranged in the axial direction; the annular toothed racks are inserted into the annular toothed grooves.
5. The construction method for the side wall of a subway station foundation pit according to claim 3, characterized in that, The major axis of the first ellipse is 75mm and the minor axis is 65mm; the major axis of the second ellipse is 50mm and the minor axis is 40mm; the thickness of the rubber locking body is 10mm.
6. The construction method for the side wall of a subway station foundation pit according to claim 3, characterized in that, The support assembly includes support sub-assemblies that correspond one-to-one with the cast-in-place sub-formwork; each support sub-assembly includes a support section and a tie rod; the support section is connected to the cast-in-place sub-formwork, and one end of the tie rod is connected to the support section, while the other end is anchored to the bottom of the foundation pit.
7. A construction method for the sidewall of a subway station foundation pit according to claim 6, characterized in that, The support section includes two parallel horizontal plates and vertical rods connecting the horizontal plates; a truss structure is provided between the vertical rods; and adjacent support sections are detachably connected.
8. A construction method for the side wall of a subway station foundation pit according to claim 7, characterized in that, The vertical rod is connected to the reinforcing rib via a right-angle plate.
9. A construction method for the sidewall of a subway station foundation pit according to claim 6, characterized in that, When fixing the sub-formwork, fix it layer by layer from bottom to top; for each layer of sub-formwork, first lock the tie rods and the sub-formwork, then fix the support section, and finally fix the diagonal tie rod; after installing the sub-formwork and the corresponding support components, install the next sub-formwork.