Formwork support structure system adjacent to deep foundation pit slope protection and construction method

Abstract

The application discloses a formwork support structure system and a construction method for a deep foundation pit slope, and belongs to the technical field of formwork support structure systems for deep foundation pits. The formwork support structure system comprises a foundation pit slope, a drainage ditch is arranged at the bottom of the foundation pit slope along the extension direction of the foundation pit slope, and the top of the foundation pit slope is provided with a top plane; a plurality of support base grooves are formed in the foundation pit slope along the extension direction of the foundation pit slope; a steel structure support foundation is arranged on the foundation pit slope; the steel structure support foundation comprises support columns, support cross beams and support longitudinal beams; and a formwork support system is arranged on the steel structure support foundation. The formwork support structure system is constructed by adopting an optimal process in a bottom-up construction sequence, the temporary steel structure columns and longitudinal and cross beams are used to build a support foundation which meets the functions, and the slope protection structure is poured with fine stone concrete after the steel wire mesh is laid, so that the slope protection meets the safety requirements and the construction is more rapid and efficient, thereby meeting the requirements of the formwork support foundation for bridge construction, and the slope instability problem caused by rainwater erosion can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of formwork construction technology, specifically to a formwork support structure system and construction method for adjacent deep foundation pit slope protection. Background Technology

[0002] In recent years, with the continuous development of society, cast-in-place box girder bridges have been widely used. The formwork erection process is particularly important in cast-in-place girder construction, but often due to site constraints, one or more construction measures need to be developed to meet functional requirements. During cast-in-place girder construction, situations sometimes arise where deep foundation pits are adjacent to the structure. There are two main conventional methods for erecting formwork supports at locations adjacent to these pits. Method one involves backfilling the soil to the predetermined elevation after the entire underground tunnel roof slab is completed. Method two involves constructing a vertical retaining wall at a suitable location on the pit slope and then backfilling the soil to the predetermined elevation. The problem with method one is that waiting until the tunnel roof slab is completed will severely delay the bridge construction schedule. The problem with method two is that the vertical retaining wall structure consumes a large amount of reinforced concrete, leading to material waste.

[0003] An existing invention patent application with application number CN202211677945.8 discloses a system and method for slope protection using temporary scaffolding in high mountains and canyons. The system comprises an anchored cable frame beam structure for the slope protection in front of the scaffolding; a wire mesh and shotcrete anchor structure for the slope protection between scaffolding sections; and an anchor rod frame beam structure for the slope protection in front of the scaffolding hoisting platform. The method for slope protection in high mountains and canyons divides the slope protection into slope protection in front of the scaffolding, slope protection between scaffolding sections, slope protection in front of the scaffolding hoisting platform, and slope protection behind the scaffolding hoisting platform; and establishes control standards for the stability and / or deformation degree of the slope protection. This application, by selecting a non-excavation protection method and employing targeted protection design, effectively reduces the investment in construction machinery and improves work efficiency while avoiding the risks of excavating steep slopes and reducing the cost of temporary protection materials.

[0004] While the terrain of high mountains and canyons shares some similarities with that of adjacent deep foundation pit slope protection, the construction factors they require are not entirely the same. For example, high mountain and canyon terrain does not require consideration of downward drainage, while terrain adjacent to deep foundation pit slope protection necessitates the construction of drainage structures to prevent rainwater and construction water from flowing down the slope into the deep foundation pit. Furthermore, the technical solution provided by the aforementioned patent, which involves the construction of anchor cable frame beams, requires a considerable amount of time and incurs significant costs.

[0005] Taking into account terrain limitations, construction period and construction cost, the applicant proposes a formwork support structure system and construction method for adjacent deep foundation pit slope protection. Summary of the Invention

[0006] The purpose of this invention is to provide a formwork support structure system and construction method for adjacent deep foundation pit slope protection. By adopting the optimal process through bottom-up construction sequence, temporary steel structure columns and longitudinal and transverse beams are used to build a functional support foundation. After laying wire mesh, fine stone concrete is poured to form a slope protection structure, which makes the slope protection meet safety requirements and the construction faster and more efficient. This satisfies the formwork support foundation required for bridge construction and can effectively avoid slope instability caused by rainwater erosion.

[0007] To achieve the above objectives, according to one aspect of the present invention, a formwork support structure system for adjacent deep foundation pit slope protection is provided, comprising:

[0008] The foundation pit slope has a drainage ditch at the bottom along its extension direction and a top plane at the top. Multiple support trenches are formed on the foundation pit slope along its extension direction.

[0009] The steel structure support foundation includes support columns, support beams and support longitudinal beams. The support columns are vertically installed in the support trench, and the support longitudinal beams are installed at the upper end of each support column. Multiple support beams are installed along the length of the support longitudinal beams, and one end of the support beam is connected to the support longitudinal beam, and the other end is connected to the embedded part installed on the top plane of the slope.

[0010] A template support system, which is built on a steel structure support foundation.

[0011] Furthermore, it also includes a wire mesh hardening treatment layer, which comprises a wire mesh and a fine stone concrete hardening layer. The wire mesh is laid on the slope of the foundation pit and bent to the top plane of the slope to form an enclosure with a width of not less than 0.5 meters. The fine stone concrete hardening layer is set on the slope surface, the top plane of the slope, and the wall surface of the supporting trench of the foundation pit, and the fine stone concrete hardening layer wraps around the wire mesh.

[0012] Furthermore, the slope of the top of the slope is 2‰-3‰, and the slope of the foundation pit side slope is 1:1.5-1:1.6.

[0013] Furthermore, a longitudinal foundation trench is provided on the top plane of the slope for placing the two ends of the supporting longitudinal beam, and a cushion concrete structure is provided on the bottom wall of both the longitudinal foundation trench and the supporting foundation trench.

[0014] Furthermore, the verticality of the supporting column shall not exceed 5mm, and the supporting longitudinal beam shall be cantilevered by 0.6m at both ends of the supporting column position and erected on the concrete cushion layer of the longitudinal foundation trench.

[0015] Furthermore, the supporting longitudinal beams and supporting columns are connected by welds, and the supporting crossbeams, supporting longitudinal beams, and embedded parts are also connected by welds; the spacing between adjacent supporting crossbeams is 0.7-1.2m, the supporting crossbeams cantilever 1-1.8m beyond the boundary of the supporting longitudinal beams, and the length of the supporting crossbeams above the hardened wire mesh layer on the slope top plane is not less than 3m.

[0016] Furthermore, the embedded component includes a helical pile and an adjusting assembly. The upper end of the helical pile has a connecting flange. The adjusting assembly includes a connecting base plate, a fixed ball, a hemispherical sleeve, and a supporting connecting element for supporting the connecting crossbeam. The fixed ball is fixedly mounted on the connecting base plate, which is connected to the connecting flange of the helical pile by bolts. The supporting connecting element includes a base plate, a top plate, and a supporting portion disposed between the base plate and the top plate. The hemispherical sleeve is welded to the base plate of the supporting connecting element. The hemispherical sleeve has a hemispherical groove with the same diameter as the fixed ball. The hemispherical sleeve fits onto the fixed ball. At least three adjusting threaded holes are provided around the hemispherical sleeve on the base plate. Adjusting bolts are installed in the adjusting threaded holes. After adjusting the top plate of the supporting connecting element to a horizontal position by turning each adjusting bolt, the adjusting bolts and the connecting base plate are fixed by welding.

[0017] Furthermore, the template support system is a double-layer ground-sweeping bar disc-type template support system, with its lower end being a support base. The support base is a double-layer ground-sweeping bar structure, and the support base is erected on the slope top plane and the steel structure support foundation.

[0018] Furthermore, the horizontal and vertical spacing of the disc-lock formwork support system is 0.6-1.5m, the web plate position is reinforced, and the horizontal crossbar spacing of the support shall not exceed 1.5m.

[0019] According to a second aspect of the present invention, a construction method for a formwork support system is provided for the construction of the aforementioned formwork support system adjacent to a deep foundation pit slope protection, comprising the following steps:

[0020] S1. Based on the slope parameters of the foundation pit slope, the self-weight parameters of the cast-in-place beam, and the load parameters, stability analysis and material selection are carried out using finite element analysis and formwork support safety verification software.

[0021] S2. The slope of the foundation pit adjacent to the deep foundation pit is reduced to form a safer slope and to meet the drainage function by coordinating with the cross slope of the top of the slope.

[0022] S3. Excavate the foundation trench at the designated location. The foundation trench includes longitudinal foundation trench and support foundation trench. After verifying the bearing capacity of the foundation, pour the foundation concrete.

[0023] S4. Erect supporting columns and supporting longitudinal beams, wherein the supporting columns and supporting longitudinal beams are connected by welds;

[0024] S5. After using wire mesh to maintain the soil on the slope and top of the foundation pit, the excavated foundation trench, the top of the slope, and the slope of the foundation pit are hardened with concrete.

[0025] S6. Install the support beam, which is welded to the support longitudinal beam and the embedded part respectively;

[0026] S7. Erect a formwork support system at the corresponding positions on the concrete plane at the top of the slope and the foundation of the steel structure support.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The template support structure system for adjacent deep foundation pit slope protection provided by the present invention adopts a reusable steel structure support foundation instead of a permanent concrete structure construction measure, which greatly saves materials, avoids material waste, has low cost, and achieves green and environmentally friendly effects.

[0029] 2. The template support structure system for adjacent deep foundation pit slope protection provided by the present invention uses wire mesh for slope protection after the steel structure support foundation is erected, and then hardens the slope with fine stone concrete. The slope of the foundation pit and the top of the slope are designed with a certain slope to meet the drainage requirements. It can effectively avoid the slope instability caused by rainwater erosion, and has better drainage effect and better safety.

[0030] 3. The construction method of the template support structure system provided by the present invention adopts the method of erecting steel structure to replace the vertical retaining wall or the construction method of waiting for the tunnel roof to be completed. While meeting the construction functional requirements, it has a certain novelty and greatly increases the construction efficiency and shortens the construction period.

[0031] 4. The template support system of the present invention is a disc-lock template support system with double-layer ground-sweeping bars. It has a support base with a double-layer ground-sweeping bar structure, which can effectively enhance the overall rigidity of the template support system, make the force on the uprights tend to be uniform, effectively improve the load-bearing capacity, and at the same time avoid the instability of the entire template support system due to the local support rigidity being too small or the deformation being too large. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the foundation pit slope;

[0033] Figure 2 This is a schematic diagram of the present invention, showing the process of slotting on the slope and top plane of the foundation pit and pouring the foundation concrete in the slot.

[0034] Figure 3This is a structural schematic diagram of the installation of the support column and support longitudinal beam of the present invention;

[0035] Figure 4 This is a schematic diagram of the slope protection and support foundation treatment of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the mounting support beam of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure for constructing the double-layer sweeping pole support base of the present invention;

[0038] Figure 7 This is a structural schematic diagram of the template support structure system for adjacent deep foundation pit slope protection provided by the present invention;

[0039] Figure 8 This is a schematic diagram of the embedded parts of the template support structure system for adjacent deep foundation pit slope protection provided by the present invention.

[0040] Figure 9 This is a three-dimensional structural diagram of the adjustment component of the embedded part;

[0041] Figure 10 This is a construction flowchart of the formwork support structure system for adjacent deep foundation pit slope protection provided by the present invention.

[0042] Attached reference numerals: 1. Excavation pit slope; 2. Drainage ditch; 3. Support trench; 4. Support column; 5. Support beam; 6. Support beam; 7. Embedded part; 701. Helical pile; 702. Connecting base plate; 703. Fixed ball; 704. Hemispherical sleeve; 705. Support connecting element; 706. Adjusting bolt; 8. Longitudinal trench; 9. Wire mesh; 10. Support base; 12. Hardened wire mesh layer; 100. Steel structure support foundation; 200. Formwork support system. Detailed Implementation

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0045] Example 1

[0046] This embodiment provides a formwork support structure system for adjacent deep foundation pit slope protection, such as... Figure 1 , Figure 2 and 7 As shown, the structure includes a foundation pit slope 1, a steel structure support foundation 100, and a formwork support system 200. A drainage ditch 2 is provided at the bottom of the foundation pit slope 1 along its extension direction. The top of the foundation pit slope 1 has a top plane. Construction machinery such as excavators is used to level and compact the foundation pit slope 1 and the top plane to meet the required foundation bearing capacity of 150 kPa. The top plane forms a transverse slope of 2‰-3‰, and the slope of the foundation pit slope 1 is 1:1.5-1:1.6. The purpose is to effectively collect construction water and rainwater into the drainage ditch 2, thereby meeting the subsequent construction drainage requirements. Multiple support trenches 3 are opened at half the height of the foundation pit slope 1 along its extension direction. There can be three, four, five, six, or more support trenches 3. A longitudinal trench 8 is opened on each side of each support trench 3 on the top plane. After the supporting trench 3 and the longitudinal trench 8 are compacted by manual labor and tamping machinery, C20 cushion concrete is poured to meet the necessary foundation bearing capacity.

[0047] like Figure 3 , Figure 4 and 5 As shown, the steel structure support foundation 100 includes supporting columns 4, supporting beams 5, and supporting longitudinal beams 6. The supporting columns 4 are vertically installed in the supporting trenches 3. There are five supporting trenches 3, and five supporting columns 4 are installed in each trench. The supporting columns 4 are made of Q235 steel pipe with a diameter of φ426*8mm. The spacing between adjacent supporting columns 4 is 2.7m, and the height of each supporting column 4 is 2.6m. The verticality of each supporting column 4 must not exceed 5mm to ensure vertical load-bearing capacity. The supporting longitudinal beams 6 are made of 12m long Q235 I-beams with a diameter of 360*136*10mm. The supporting longitudinal beams 6 are installed on the upper end of each supporting column 4 and are connected to the supporting columns 4 by welds to form a stable structure. The supporting longitudinal beams 6 cantilever 0.6m at both ends of the supporting columns 4 and are supported on the concrete cushion layer of the longitudinal trenches 8.

[0048] like Figure 4 , Figure 5 , Figure 8 and 9As shown, 11 embedded parts 7 are pre-embedded on the slope top plane, and the arrangement direction of each embedded part 7 is the same as the length direction of the supporting longitudinal beam 6. The embedded part 7 is made of steel and includes a spiral pile 701 and an adjusting assembly. The upper end of the spiral pile 701 has a connecting flange. The adjusting assembly includes a connecting base plate 702, a fixing ball 703, a hemispherical sleeve 704, and a supporting connecting element 705 for supporting the connecting crossbeam 5. The fixing ball 703 is fixedly welded to the connecting base plate 702, and the connecting base plate 702 is connected to the connecting flange of the spiral pile 701 by bolts. The supporting connecting element 705 includes a base plate, a top plate, and a supporting part disposed between the base plate and the top plate. The supporting part can be a single plate, a cross plate, a star plate, a cylinder, a square column, a hexagonal prism, or other different structures. A hemispherical sleeve 704 is welded to the base plate of the supporting connecting element 705. The hemispherical sleeve 704 has a hemispherical groove with the same diameter as the fixed ball 703. The hemispherical sleeve 704 fits onto the fixed ball 703, allowing the supporting connecting element 705 to be rotated and adjusted arbitrarily within a certain angular range. To ensure good contact between the supporting beam 5 and the embedded part 7, the top plate of the supporting connecting element 705 of the embedded part 7 should be adjusted to be horizontal. Four adjusting threaded holes are provided around the hemispherical sleeve 704 on the base plate, and an adjusting bolt 706 is installed in each of the four adjusting threaded holes. After adjusting the top plate of the supporting connecting element 705 to be horizontal by turning the adjusting bolts 706, the adjusting bolts 706 and the connecting base plate 702 are fixed by welding. This allows the supporting connecting element 705 to be supported simultaneously by the four adjusting bolts 706 and the fixed ball 703, resulting in better support. The supporting crossbeams 5 are set perpendicular to the supporting longitudinal beams 6, and 11 supporting crossbeams 5 are evenly arranged along the length of the supporting longitudinal beams 6. The supporting crossbeams 5 are made of 9m long Q235 I-beams with a diameter of 100*68*4.5mm. The spacing between adjacent supporting crossbeams 5 is 0.9m. The supporting crossbeams 5, supporting longitudinal beams 6, and embedded parts 7 are all connected by welds. The supporting crossbeams 5 cantilever 1.5m beyond the boundary of the supporting longitudinal beams 6. The length of the supporting crossbeams 5 above the wire mesh hardened treatment layer 12 on the slope top plane is not less than 3m.

[0049] like Figure 4 As shown, after the supporting columns 4 and supporting longitudinal beams 6 are erected and welded, wire mesh 9 is laid at the slope location. The wire mesh 9 covers the slope 1 of the foundation pit and is bent to form an enclosure at the top of the slope, with an enclosure width of not less than 0.5m. Then, the excavated foundation trench, the slope surface of the foundation pit 1, and the top of the slope are hardened using C20 fine aggregate concrete. The wire mesh 9 and the hardened fine aggregate concrete layer together form the wire mesh hardened layer 12. It should be noted that the embedded parts 7 should be pre-embedded before the use of fine aggregate concrete for hardening.

[0050] like Figure 6 and Figure 7As shown, the formwork support system 200 is erected on the hardened wire mesh layer 12 and the steel structure support foundation 100. The formwork support system 200 is a double-layered, ground-level bar-type disc-lock formwork support system, with a supporting base 10 at its lower end. The supporting base 10 is also a double-layered, ground-level bar structure, erected on the slope top plane and the steel structure support foundation 100. The uprights of the disc-lock formwork support system are made of Q345 steel pipe with a diameter of φ48×3.2×1500mm, the horizontal bars are made of Q345 steel pipe with a diameter of φ48×2.5×840mm, and the vertical diagonal bars are made of Q345 steel pipe with a diameter of φ48×2.5×1560mm. The horizontal and vertical spacing of the disc-lock formwork support system is 0.9m, with reinforced web reinforcement, and the horizontal bar spacing is 1.5m. The double-layer sweeping bar structure of the support base 10 can effectively enhance the overall rigidity of the formwork support system 200, make the force on the uprights more uniform, effectively improve the load-bearing capacity, and at the same time avoid the instability of the entire formwork support system 200 due to the local support rigidity being too small or the deformation being too large.

[0051] Example 2

[0052] This embodiment provides a construction method for a formwork support system, used for the construction of the formwork support system adjacent to a deep foundation pit slope protection provided in Embodiment 1, including the following steps:

[0053] S1. Based on the slope parameters of the foundation pit slope 1, the self-weight parameters of the cast-in-place beam, and the load parameters, stability analysis and material selection are carried out using finite element analysis and formwork support safety verification software.

[0054] S2, such as Figure 1 As shown, the slope of the foundation pit 1 adjacent to the deep foundation pit is reduced to create a safer slope and to complement the cross slope of the top of the slope to meet drainage requirements. Excavators and other construction machinery are used to level and compact the foundation pit slope 1 and the top of the slope to meet the required foundation bearing capacity of 150 kPa. The top of the slope forms a cross slope of 2‰-3‰, and the slope of the foundation pit slope 1 is 1:1.5-1:1.6. The purpose is to effectively collect construction water and rainwater into drainage ditch 2, thereby meeting the subsequent construction drainage requirements.

[0055] S3, such as Figure 2 As shown, foundation trenches are excavated at designated locations. The foundation trenches include longitudinal trenches 8 and supporting trenches 3. Supporting trenches 3 are excavated at half the height of the foundation pit slope 1, while longitudinal trenches 8 are excavated on the slope crest plane. There are two longitudinal trenches 8, located on either side of each supporting trench 3. After verifying the bearing capacity of the foundation, a concrete cushion layer is poured on the bottom walls of the longitudinal trenches 8 and supporting trenches 3.

[0056] S4, such as Figure 3As shown, supporting columns 4 and supporting longitudinal beams 6 are erected and connected by welds to form a stable structure. After the construction of supporting columns 4 is completed, the verticality must be checked, and the verticality of supporting columns 4 must not exceed 5mm. The supporting longitudinal beams 6 cantilever 0.6m at both ends of the supporting columns 4 and are erected on the concrete cushion of the longitudinal foundation trench 8.

[0057] S5, such as Figure 4 As shown, after using wire mesh 9 to maintain the soil on the slope 1 and the top of the slope, the excavated foundation trench, the top of the slope and the slope 1 are hardened with concrete to form a wire mesh hardening layer 12.

[0058] S6, such as Figure 5 As shown, a support beam 5 is installed, and the support beam 5 is welded to the support longitudinal beam 6 and the embedded part 7 respectively. The support beam 5 cantilevered 1.5m beyond the boundary of the support longitudinal beam 6, and the length of the support beam 5 above the wire mesh hardened treatment layer 12 on the slope top plane is not less than 3m.

[0059] S7, such as Figure 6 and Figure 7 As shown, a formwork support system 200 is erected at the corresponding positions on the concrete plane at the top of the slope and the steel structure support foundation 100. The formwork support system 200 is a disc-lock type formwork support system with double-layer ground-level bracing, and its lower end is a support base 10. The support base 10 is a double-layer ground-level bracing structure and is erected on the top of the slope and the steel structure support foundation 100.

[0060] The working principle of this invention: The formwork support system for adjacent deep foundation pit slope protection provided by this invention uses a reusable steel structure support foundation 100 instead of a permanent concrete structure construction method, which greatly saves materials, avoids material waste, has low cost, and achieves a green and environmentally friendly effect. After the steel structure support foundation 100 is erected, the formwork support system for adjacent deep foundation pit slope protection uses wire mesh 9 for slope protection and then hardens the slope with fine stone concrete. The slope of the foundation pit 1 and the top of the slope are designed with a certain slope to meet drainage requirements, effectively avoiding slope instability caused by rainwater erosion, providing better drainage and safety. The construction method of the formwork support system provided by this invention uses the erection of a steel structure instead of vertical retaining walls or waiting for the tunnel roof slab to be completed. While meeting the functional requirements of construction, it is novel and greatly increases construction efficiency, shortening the construction period.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A formwork support structure system for adjacent deep foundation pit slope protection, characterized in that, include: The foundation pit slope (1) has a drainage ditch (2) at the bottom of the foundation pit slope (1) along the extension direction of the foundation pit slope (1), and the top of the foundation pit slope (1) has a top plane; multiple support trenches (3) are opened on the foundation pit slope (1) along its extension direction. A steel structure support foundation (100) includes support columns (4), support beams (5) and support longitudinal beams (6). The support columns (4) are vertically arranged in the support trench (3), and the support longitudinal beams (6) are arranged at the upper end of each support column (4). Multiple support beams (5) are arranged along the length of the support longitudinal beams (6), and one end of the support beams (5) is connected to the support longitudinal beams (6), and the other end is connected to the embedded parts (7) arranged on the slope top plane. A formwork support system (200) is built on a steel structure support foundation (100); The wire mesh hardening treatment layer (12) includes a wire mesh (9) and a fine stone concrete hardening layer. The wire mesh (9) is laid on the slope (1) of the foundation pit and bent to the top plane of the slope to form an enclosure with a width of not less than 0.5 meters. The fine stone concrete hardening layer is set on the slope surface, the top plane of the slope (1) and the wall surface of the supporting trench (3). The fine stone concrete hardening layer wraps around the wire mesh (9). The slope top plane is provided with longitudinal foundation trenches (8) for placing the two ends of the supporting longitudinal beam (6), and the bottom walls of the longitudinal foundation trenches (8) and the supporting foundation trenches (3) are provided with cushion concrete structures. The supporting longitudinal beam (6) and the supporting column (4) are connected by welds. The supporting crossbeam (5), the supporting longitudinal beam (6), and the embedded parts (7) are also connected by welds. The spacing between adjacent supporting crossbeams (5) is 0.7-1.2m. The supporting crossbeam (5) cantilevered 1-1.8m beyond the boundary of the supporting longitudinal beam (6). The length of the supporting crossbeam (5) above the wire mesh hardened treatment layer (12) on the slope top plane is not less than 3m.

2. The formwork support structure system for adjacent deep foundation pit slope protection according to claim 1, characterized in that, The slope of the top of the slope is 2‰-3‰, and the slope of the foundation pit slope (1) is 1:1.5-1:1.

6.

3. The formwork support structure system for adjacent deep foundation pit slope protection according to claim 1, characterized in that, The verticality of the support column (4) shall not exceed 5mm. The support longitudinal beam (6) is cantilevered by 0.6m at the positions of the support column (4) at both ends and is erected on the concrete cushion of the longitudinal foundation trench (8).

4. The formwork support structure system for adjacent deep foundation pit slope protection according to claim 1, characterized in that, The embedded part (7) includes a helical pile (701) and an adjusting assembly. The upper end of the helical pile (701) has a connecting flange. The adjusting assembly includes a connecting base plate (702), a fixed ball (703), a hemispherical sleeve (704), and a supporting connecting element (705) for supporting the connecting supporting beam (5). The fixed ball (703) is fixedly mounted on the connecting base plate (702), and the connecting base plate (702) is connected to the connecting flange of the helical pile (701) by bolts. The supporting connecting element (705) includes a base plate part, a top plate part, and a supporting part disposed between the base plate part and the top plate part. The hemispherical sleeve (704) is welded to the base plate of the supporting connecting element (705). The hemispherical sleeve (704) has a hemispherical groove with the same diameter as the fixed ball (703). The hemispherical sleeve (704) is fitted onto the fixed ball (703). At least three adjusting threaded holes are provided around the hemispherical sleeve (704) on the base plate. Adjusting bolts (706) are installed in the adjusting threaded holes. After turning each adjusting bolt (706) to adjust the top plate of the supporting connecting element (705) to be horizontal, the adjusting bolts (706) and the connecting base plate (702) are fixed by welding.

5. A formwork support structure system for adjacent deep foundation pit slope protection according to claim 1, characterized in that, The template support system (200) is a double-layer ground-sweeping bar disc-type template support system, with a support base (10) at its lower end. The support base (10) is a double-layer ground-sweeping bar structure and is erected on the slope top plane and the steel structure support foundation (100).

6. A formwork support structure system for adjacent deep foundation pit slope protection according to claim 5, characterized in that, The horizontal and vertical spacing of the disc-lock formwork support system is 0.6-1.5m, with denser reinforcement at the web position, and the step distance of the horizontal crossbars of the support shall not exceed 1.5m.

7. A construction method for a formwork support system, used for the construction of the formwork support system adjacent to a deep foundation pit slope protection as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Based on the slope parameters of the foundation pit slope (1), the self-weight parameters of the cast-in-place beam, and the load parameters, the stability analysis and material selection are carried out using the finite element analysis and formwork support safety verification software system. S2. The slope of the foundation pit adjacent to the deep foundation pit (1) is reduced to form a safer slope and to meet the drainage function in conjunction with the cross slope of the top of the slope. S3. Excavate the foundation trench at the designated location. The foundation trench includes a longitudinal foundation trench (8) and a support foundation trench (3). After verifying the bearing capacity of the foundation, pour the foundation concrete. S4. Erect supporting columns (4) and supporting longitudinal beams (6), wherein the supporting columns (4) and supporting longitudinal beams (6) are connected by welds; S5. After using wire mesh (9) to maintain the soil of the foundation pit slope (1) and the top of the slope, concrete hardening treatment is carried out on the excavated foundation trench, the top of the slope and the foundation pit slope (1). S6. Install the support beam (5), and the support beam (5) is welded to the support longitudinal beam (6) and the embedded part (7); S7. Erect a formwork support system (200) at the corresponding positions on the concrete plane at the top of the slope and the steel structure support foundation (100).

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