A basement outer wall supporting system and construction method of a cooperative supporting pile stress

Abstract

The present application relates to the technical field of underground fixed building, and particularly relates to a basement outer wall supporting system and a construction method of a collaborative supporting pile stress, which comprises a basement outer wall, a plurality of rib walls and a plurality of supporting piles, each supporting pile is located at the periphery of the basement outer wall, and the plurality of supporting piles are arranged at intervals along the circumference of the basement outer wall; the plurality of rib walls correspond to the plurality of supporting piles one by one, the rib wall is arranged between the basement outer wall and the supporting pile, and each rib wall connects each supporting pile and the basement outer wall into a whole. When the basement has a large buried depth or a large floor height, the bending moment of the basement outer wall will be large, the present application forms a constraint on the outer wall surface of the basement outer wall through the supporting pile and the rib wall, forms a basement outer wall supporting system which collaborates with the supporting pile to bear stress, changes the stress characteristics of the basement outer wall, greatly improves the bending resistance of the basement outer wall, effectively reduces the thickness of the basement outer wall, and effectively increases the building area inside the basement.

Description

Technical Field

[0001] This invention relates to the field of underground fixed building technology, and in particular to a basement exterior wall support system and construction method with synergistic support piles. Background Technology

[0002] Since the retaining piles are the supporting structure of the foundation pit, before the deep foundation pit is excavated, the retaining piles are usually constructed on the outside of the foundation pit. Then the foundation pit is excavated. After the foundation pit is excavated, the basement structure is usually constructed inside the foundation pit, and the water and soil pressure is gradually transferred to the outer wall of the basement through construction of replacement support belts, etc.

[0003] However, in the existing technology, the application of support piles in the basement structure is abandoned after the foundation pit is excavated, resulting in a waste of support piles. When the foundation pit is deep or the basement has no floor slab, the water and soil pressure will cause a large internal force to be generated in the basement exterior wall, resulting in the need for thicker basement exterior walls to resist the water and soil pressure, thereby reducing the basement building area and significantly increasing the construction cost.

[0004] In summary, when the existing foundation pit is deep or the basement has no floor slab, thicker basement exterior walls are required to resist water and soil pressure, thereby reducing the internal building area of ​​the basement. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a basement exterior wall support system and construction method with synergistic support piles, which solves the technical problem of needing thicker basement exterior walls to resist water and soil pressure when the foundation pit is deep or the basement has no floor slab, thereby reducing the internal building area of ​​the basement.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A basement exterior wall support system with coordinated support piles includes a basement exterior wall, multiple rib walls, and multiple support piles. Each support pile is located on the periphery of the basement exterior wall, and the multiple support piles are spaced apart along the circumference of the basement exterior wall. Each of the multiple rib walls corresponds one-to-one with the multiple support piles. The rib walls are located between the basement exterior wall and the support piles, and each rib wall connects each support pile to the basement exterior wall as a whole.

[0007] Furthermore, the internal reinforcing bars of the support pile are connected to the internal reinforcing bars of the rib wall.

[0008] Furthermore, the rib wall is integrally cast with the basement exterior wall.

[0009] Furthermore, a connecting steel bar is reserved on the side of the support pile near the rib wall, and the internal steel bar of the support pile is connected to the internal steel bar of the rib wall through the connecting steel bar.

[0010] Furthermore, the diameter of the connecting steel bar is set as d, and the welding length between the connecting steel bar and the internal steel bar of the rib wall is 10d.

[0011] Furthermore, the spacing between adjacent ribs is equal.

[0012] Furthermore, a capping beam is provided at the top of the support piles, which connects multiple support piles into one unit.

[0013] Furthermore, the rib wall is also integrated with the crown beam.

[0014] Furthermore, the cross-section of the rib wall is rectangular.

[0015] A construction method for a basement exterior wall support system based on the aforementioned synergistic support pile force distribution includes the following steps: S1. Cast support piles around the perimeter of the foundation pit to be excavated. At the same time, leave gaps and connecting steel bars at the connection points between each support pile and each rib wall. The gaps are sealed by foam baffles. The first end of the connecting steel bar is connected to the internal steel cage of the support pile, and the other end extends out of the support pile through the foam baffle and bends upward. S2. Excavate the foundation pit, and excavate the earthwork layer by layer to the foundation elevation; S3. Erect the formwork for the basement exterior walls and ribs, and install reinforcing bars inside the formwork for the basement exterior walls and ribs. S4. Remove the foam baffle and straighten the pre-reserved connecting steel bars on the support piles and weld them to the steel bars inside the rib wall formwork. S5. Pour concrete inside the formwork of the basement exterior wall and rib wall to complete the construction of the basement exterior wall and rib wall, so that the rib wall connects the support piles with the basement exterior wall as one unit.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses support piles and rib walls to constrain the exterior of the basement walls, thus altering their stress characteristics. Without rib walls, the basement walls can be considered as one-way slabs with a span equal to the floor height under bending. When the burial depth or floor height is large, the bending moment on the walls will be very large, which is economically unfavorable. This invention uses rib walls to connect the support piles and the basement walls as a whole, transforming the basement walls into two-way slabs under bending, greatly improving their bending resistance. At the same time, there is no need for thick basement walls to resist water and soil pressure, thereby effectively increasing the internal building area of ​​the basement. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the basement exterior wall support system of the present invention; Figure 2This is a side view of the connection between the support piles, the basement exterior wall, and the rib wall in this embodiment; Figure 3 This is a top view of the connection between the support piles, the basement exterior wall, and the rib wall in this embodiment; Figure 4 This is a test diagram of the deformation of the one-way plate under water and soil pressure in this embodiment; Figure 5 This is a test diagram of the deformation of the two-way plate under water and soil pressure in this embodiment.

[0018] Numbers in the attached drawings: 1. Support piles; 10. Connecting steel bars; 2. Rib walls; 3. Basement exterior walls; 4. Floor slab; 5. Cap beam; 6. Foam baffles; 7. Top slab; 8. Longitudinal reinforcement. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, it should be noted that in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] Example 1 In deep foundation pit engineering, the basement exterior walls often need to independently bear lateral water and soil pressure. Traditional construction uses support piles as temporary support structures for the foundation pit. After the main structure of the basement is completed, the support piles are discarded, which not only wastes materials but also forces the basement exterior walls to be thickened to meet the load-bearing and deformation requirements, resulting in a reduction in the basement building area and an increase in cost. If the foundation pit is deep or the basement lacks horizontal floor slab support, the basement exterior walls are prone to excessive flexural deformation and bending moment under water and soil pressure. Their stress can be regarded as a one-way slab with a span equal to the story height, resulting in insufficient bending stiffness.

[0023] Therefore, this invention transforms the temporary support structure into a permanent load-bearing component. By setting rib walls as force transmission links, the support piles and the basement exterior wall form a spatially coordinated load-bearing whole, thereby reconstructing the boundary constraints and internal force distribution law of the basement exterior wall.

[0024] Please refer to Figures 1-5 In a first aspect, the present invention provides a basement exterior wall 3 support system with synergistic support piles 1 bearing force, including basement exterior wall 3, multiple rib walls 2 and multiple support piles 1.

[0025] Reference Figures 1-3 Each support pile 1 is located on the periphery of the basement exterior wall 3, and multiple support piles 1 are spaced apart along the circumference of the basement exterior wall 3; multiple rib walls 2 correspond one-to-one with multiple support piles 1, and the rib walls 2 are located between the basement exterior wall 3 and the support piles 1, and each rib wall 2 connects each support pile 1 and the basement exterior wall 3 into one unit.

[0026] The basement exterior wall 3 is a cast-in-place reinforced concrete wall. In this system, the basement exterior wall 3 not only bears the vertical load and part of the lateral load, but also shares the load with the rib wall 2 and the support pile 1. At the same time, the connection interface between the basement exterior wall 3, the support pile 1 and the rib wall 2 ensures the continuity of force transmission.

[0027] The support pile 1 is a bored cast-in-place pile. The pile diameter of the support pile 1 is set according to the geological conditions and lateral bearing capacity requirements. The pile length of the support pile 1 meets the requirements of embedment depth and overall stability. The concrete strength of the support pile 1 meets the design requirements. The steel cage inside the support pile 1 has sufficient rigidity and ductility to adapt to the need for coordinated deformation with the rib wall 2. In this system, the support pile 1 not only serves as a support structure during the foundation pit construction period, but also forms a rigid connection with the basement exterior wall 3 through the rib wall 2 after the foundation pit construction is completed, participating in resisting lateral water and soil pressure. This eliminates the need for a thicker basement exterior wall 3 to resist water and soil pressure, effectively increasing the internal building area of ​​the basement.

[0028] In addition, the support piles 1 and the rib wall 2 form a constraint on the outside of the basement exterior wall 3, which changes the stress characteristics of the basement exterior wall 3 and greatly improves the bending resistance of the basement exterior wall 3.

[0029] It should be noted that without rib wall 2, the basement exterior wall 3 can be considered as a one-way slab with a span equal to the floor height subjected to bending. When the burial depth or floor height is large, the bending moment on the basement exterior wall 3 will be very large, such as... Figure 4 As shown; when rib wall 2 is installed, the retaining pile 1 is connected to the basement exterior wall 3 through rib wall 2, so that the basement exterior wall 3 will be transformed into a two-way slab subjected to bending, and its bending resistance will be greatly improved, such as Figure 5 As shown.

[0030] The rib wall 2 is a cast-in-place reinforced concrete wall with a rectangular, T-shaped, or L-shaped cross-section. In this embodiment, a rectangular shape is preferred. The thickness of the rib wall 2 is set according to the connection stiffness requirements with the support pile 1 and the basement exterior wall 3. The height of the rib wall 2 is the same as that of the basement exterior wall 3. The longitudinal and transverse steel bars configured inside the rib wall 2 are reliably connected to the steel bars inside the basement exterior wall 3 and the support pile 1 to ensure effective force transmission.

[0031] The rib wall 2 effectively transmits the lateral pressure of the soil provided by the support pile 1 to the basement exterior wall 3 through its own rigidity. When the rib wall 2 is arranged around the basement exterior wall 3 at a certain interval, the entire basement exterior wall 3 can be divided into multiple sections, so that the stress state of the basement changes from a one-way slab to a two-way slab, which significantly improves the bending stiffness and bearing capacity of the basement.

[0032] The core innovation of this invention lies in the fact that the originally discrete support piles 1 and the main basement exterior wall 3 are integrated at the structural level through the rib wall 2, so that the support piles 1 are transformed from temporary support components into permanent load-bearing components that work in conjunction with the main structure.

[0033] In one example, the excavation depth of the foundation pit is 28 m. 32 bored piles with a diameter of 1000 mm are used as support piles 1, arranged at equal intervals along the perimeter of the proposed basement exterior wall 3. Each support pile 1 corresponds to a rectangular rib wall 2 with a thickness of 500 mm and a height of 28.5 m. The rib wall 2 is integrally connected to the basement exterior wall 3 (thickness 600 mm) and the support piles 1 by steel reinforcement welding and concrete pouring. After construction, structural calculations show that the maximum bending moment at mid-span of the basement exterior wall 3 under water and soil pressure is reduced by 62% compared to the traditional one-way slab model. The wall thickness is optimized from the original design of 800 mm to 600 mm, saving 2300 m³ of concrete and increasing the effective usable area of ​​the basement by 1800 m².

[0034] In summary, because the present invention sets up rib walls 2 corresponding one-to-one with the support piles 1, and connects the support piles 1, rib walls 2 and basement exterior walls 3 into one unit, the boundary constraint conditions of the basement exterior walls 3 are changed, transforming the basement exterior walls 3 from a one-way slab bending mode to a two-way slab bending mode, thereby reducing the maximum bending moment of the basement exterior walls 3 and achieving the thinning of the basement exterior walls 3. Due to the reduced thickness of the basement exterior walls 3, the amount of concrete and steel reinforcement used in pouring the basement exterior walls 3 is reduced, thereby reducing construction costs and increasing the effective usable area inside the basement.

[0035] Of course, the internal reinforcing bars of the support pile 1 are connected to the internal reinforcing bars of the rib wall 2. The internal reinforcing bars of the support pile 1 refer to the reinforcing cage formed by the longitudinal main bars and stirrups embedded in the pile concrete during the construction of the cast-in-place support pile 1; the internal reinforcing bars of the rib wall 2 refer to the reinforcing mesh formed by the longitudinal bars 8 and distribution bars placed in the formwork before the rib wall 2 is poured. Furthermore, connecting reinforcing bars 10 are pre-installed on the side of the support pile 1 near the rib wall 2, and the internal reinforcing bars of the support pile 1 are connected to the internal reinforcing bars of the rib wall 2 through the connecting reinforcing bars 10.

[0036] The connecting steel bar 10 refers to the steel bar segment pre-embedded in the concrete on the side of the support pile 1 near the rib wall 2 during the construction stage. One end of the connecting steel bar 1 is fixedly connected to the internal steel cage of the support pile 1 by binding or welding, and the other end extends out of the support pile 1 in a direction perpendicular to the side of the support pile 1, so as to form a connection with the internal steel bars of the rib wall 2 during the subsequent construction of the rib wall 2. The reserved position of the connecting steel bar 10 on the support pile 1 must match the corresponding setting position of the rib wall 2 on the basement exterior wall 3 to ensure that the two can be accurately connected in space.

[0037] The connection between the internal reinforcing bars of the support pile 1 and the internal reinforcing bars of the rib wall 2 via the connecting reinforcing bars 10 can be understood as follows: a stable force transmission path is formed between the internal reinforcing bars of the support pile 1 and the connecting reinforcing bars 10. The connecting reinforcing bars 10 are then continuously connected to the internal reinforcing bars of the rib wall 2 through on-site welding, mechanical connection, or lap splicing. This allows the support pile 1, the connecting reinforcing bars 10, and the rib wall 2 to jointly bear the horizontal water and soil pressure under stress, and effectively transfer the load to the basement exterior wall 3. This connection method creates a mechanical integrity between the support pile 1 and the rib wall 2, avoiding misalignment of reinforcing bars or connection failure due to differences in construction sequence.

[0038] In this embodiment, the diameter of the connecting steel bar 10 is set as d, and the welding length between the connecting steel bar 10 and the internal steel bar of the rib wall 2 is 10d. This ensures that the weld metal is fully fused and provides an effective weld area, avoiding brittle fracture caused by stress concentration at the weld toe or weld root due to the weld being too short.

[0039] The welding method for connecting the reinforcing bar 10 to the internal reinforcing bar of the rib wall 2 can be single-sided lap welding or double-sided lap welding. Single-sided lap welding is suitable for situations where the working space is limited, while double-sided lap welding is suitable for working conditions where the connection strength requirement is higher. The welding method can be reasonably changed according to the actual situation.

[0040] It should be noted that by reserving connecting steel bars 10 during the construction stage of the support pile 1 and reliably connecting the connecting steel bars 10 with the internal steel bars of the rib wall 2 during the construction stage of the rib wall 2, the risk of joint slippage caused by differences in concrete age, interface contamination, or insufficient compaction is avoided, as it does not depend on the later concrete interface bond strength. At the same time, the direct connection of the steel bars between the support pile 1 and the rib wall 2 ensures that the effective force transfer capacity between the support pile 1 and the rib wall 2 can still be maintained under the action of earthquakes or sudden lateral loads.

[0041] The spacing between adjacent ribs 2 is equal, that is, the multiple ribs 2 arranged around the perimeter of the basement exterior wall 3 are evenly distributed along the wall's direction, meaning that the distance between the centerlines of any two adjacent ribs 2 is the same. This spacing can be determined comprehensively based on factors such as the structural span of the basement exterior wall 3, the design load, the concrete strength grade, and the bearing capacity of the support piles 1. This embodiment does not impose any special limitations on this.

[0042] In addition, a waist beam (not shown) is installed between two adjacent retaining piles. This waist beam can also serve to balance the force on each rib wall and allow each retaining pile to work together to prevent continuous collapse.

[0043] The equidistant arrangement of the ribs 2 divides the basement exterior wall 3 into multiple exterior wall sections. Each exterior wall section has the same boundary constraints and force path under water and soil pressure, thus ensuring that each exterior wall section can effectively present the two-way slab bending stress mode. The ribs 2 and the basement exterior wall 3 together form a continuous support system, and the equidistant arrangement ensures the symmetry of the support system, so that the lateral reaction force borne by the support piles 1 can be evenly transferred to the basement exterior wall 3 through the ribs 2.

[0044] Specifically, when the rib walls 2 are equidistantly arranged around the basement exterior wall 3, the basement exterior wall 3 forms a regular grid-like support structure in the horizontal direction, and its overall stiffness distribution tends to be uniform. The process of water and soil pressure being transmitted from the rib walls 2 to the support piles 1 has a clear transmission path: the pressure is first transmitted from the surface of the basement exterior wall 3 to the root of the rib walls 2, and then transmitted through the cross section of the rib walls 2 to the pile body of the support piles 1. Finally, the support piles 1 transmit the horizontal load to the deep foundation, thereby reducing the risk of local stress concentration in the structure.

[0045] The rib wall 2 and the basement exterior wall 3 are cast integrally, allowing the load to be smoothly transferred along the interface between the rib wall 2 and the basement exterior wall 3. Since there is no construction joint between the rib wall 2 and the basement exterior wall 3, the risk of leakage and reduction in shear performance that may be caused by traditional staged casting is avoided. In addition, since the concrete of the rib wall 2 and the basement exterior wall 3 is integrally formed, the structure's ability to deform in tandem under water and soil pressure is improved, making the actual stress state of the basement exterior wall 3 closer to that of a two-way slab. Thus, under the premise of meeting the same load-bearing requirements, the thickness of the basement exterior wall 3 can be reduced, thereby increasing the effective usable area of ​​the basement.

[0046] A capping beam 5 is provided at the top of the support piles 1, which connects multiple support piles 1 into one unit. The capping beam 5 refers to a reinforced concrete connecting beam installed along the top of the multiple support piles 1. In the early stages of excavation, the support piles 1 begin to bear lateral soil and water pressure. Without the constraint of the capping beam 5, the tops of each support pile 1 are prone to varying degrees of horizontal displacement, leading to inconsistent deformation between piles. The capping beam 5, through its own bending stiffness and anchorage connection to the top of the support piles 1, forcibly constrains the tops of each pile to the same horizontal deformation state, transforming the support pile group 1 from discrete stress units into a frame-type support structure with overall lateral stiffness.

[0047] The support pile 1, rib wall 2 and cap beam 5 are connected as one, which improves the stability of the entire support system.

[0048] Of course, based on the above structure, the bottom and top of the basement exterior wall 3 are respectively provided with a bottom plate 4 and a top plate 7. The bottom of the basement exterior wall 3 is constrained by the bottom plate 4, and the top of the basement exterior wall 3 is constrained by the top plate 7.

[0049] Secondly, the present invention also provides a construction method for a basement exterior wall support system with synergistic support piles 1 bearing load, comprising the following steps: S1. Cast support piles 1 around the perimeter of the foundation pit to be excavated. At the same time, leave gaps and connecting steel bars 10 at the connection positions of each support pile 1 and each rib wall 2. The gaps are sealed by foam baffles 6. The first end of the connecting steel bar 10 is connected to the internal steel cage of the support pile 1, and the other end extends out of the support pile 1 through the foam baffles 6 and bends upward. S2. Excavate the foundation pit, and excavate the earthwork layer by layer to the foundation elevation; S3. Erect the formwork for the basement exterior wall 3 and rib wall 2, and install reinforcing bars inside the formwork for the basement exterior wall 3 and rib wall 2. S4. Remove the foam baffle 6, straighten the pre-reserved connecting steel bar 10 on the support pile 1 and weld it to the steel bar in the formwork of the rib wall 2; S5. Pour concrete into the formwork of basement exterior wall 3 and rib wall 2 to complete the construction of basement exterior wall 3 and rib wall 2, so that rib wall 2 connects support pile 1 and basement exterior wall 3 into one unit.

[0050] In step S1, the reserved notch is a spatial structure used to accommodate the connecting steel bar 10 and subsequent welding operations. It can be a rectangular or circular slot. The foam baffle 6 is used to temporarily seal the notch during the concrete pouring of the support pile 1 to prevent concrete slurry from seeping into the notch. That is, the foam baffle 6 acts as an isolation between the connecting steel bar 10 and the steel cage of the support pile 1, preventing the concrete from pouring the connecting steel bar 10 and the steel cage of the support pile 1 together, thereby ensuring the integrity of the notch and the positioning of the connecting steel bar 10. The connecting steel bar 10 is used to realize the mechanical transfer between the support pile 1 and the steel bars of the rib wall 2. Its first end is reliably connected to the steel cage inside the support pile 1 by binding or welding. The second end bends upward after passing through the foam baffle 6 to form a preset angle (such as 90°). This bending shape can avoid collision damage to the steel bar during subsequent earthwork excavation and foundation pit operations.

[0051] This section explains how to pre-install connecting steel bars 10 on the support pile 1: Drill a rotary hole around the perimeter of the excavation pit, with the hole depth greater than the pit depth. Fix a foam board to the outer surface of the reinforcing cage, and place connecting steel bars 10 at the location of the foam board. One end of the connecting steel bar 10 is connected and fixed to the reinforcing cage, and the other end passes through the foam board and bends upward. Next, place the reinforcing cage into the hole, with the connecting steel bars 10 located outside the foam board in contact with the inner wall of the hole. Then, pour concrete through a tremie pipe, pouring the concrete from bottom to top to complete the grouting of the support pile 1. After the concrete has solidified, remove a thin layer of concrete outside the connecting steel bars 10 to expose the connecting steel bars 10 located outside the foam board.

[0052] In step S2, layer-by-layer excavation refers to the earth removal operation carried out in layers, sections and symmetrically according to the foundation pit support design requirements. This process ensures that the soil pressure on the periphery of the support pile 1 is released evenly, and avoids the support pile 1 from shifting due to unloading on one side.

[0053] In step S3, the formwork frame of the basement exterior wall 3 is used as a temporary support structure to constrain the concrete forming space of the basement exterior wall 3, and the formwork frame of the rib wall 2 is used as a temporary support structure to constrain the concrete forming space of the rib wall 2. The formwork frame can be a wooden formwork, steel formwork, or aluminum alloy formwork system. Erecting reinforcing bars refers to binding or welding a reinforcing mesh within the formwork frame to form the load-bearing skeleton of the basement exterior wall 3 or the rib wall 2. This includes vertical and horizontal distribution bars of the basement exterior wall 3, and longitudinal main bars (longitudinal bars 8) and transverse stirrups of the rib wall 2. Sufficient length of the longitudinal bars 8 is reserved on the side near the support pile 1 to allow for butt welding with the reserved connecting reinforcing bars 10 of the support pile 1.

[0054] In step S4, removing the foam baffle 6 means removing the foam material blocking the gap in the support pile 1 manually or mechanically after the reinforcement of the rib wall 2 is tied. A handheld hot wire cutter can be used to slowly melt and cut along the edge of the foam baffle 6, or a special pry bar can be used to gently tap and peel it off, avoiding damage to the concrete surface of the support pile 1 and the reserved reinforcement. Straightening means restoring the upwardly bent connecting reinforcement 10 to a straight state that is basically parallel to the axis of the longitudinal reinforcement 8 of the rib wall 2. This can be done by applying a controllable torque with the help of an adjustable wrench or a special reinforcement straightening clamp. After straightening, the angle between the axis of the reinforcement and the axis of the longitudinal reinforcement 8 of the rib wall 2 is not greater than 5°. Welding means achieving a metallurgical bond between the connecting reinforcement 10 and the longitudinal reinforcement 8 of the rib wall 2 through an arc welding process. The effective length of the weld is not less than 10d (d is the diameter of the connecting reinforcement 10), and the weld slag is removed in time.

[0055] For example, after the reinforcement of rib wall 2 is tied, the workers use a hot wire cutter to melt and separate the foam baffle 6 around its perimeter, carefully remove the entire foam baffle 6, and expose the intact bent end of the connecting reinforcement 10; use an adjustable wrench to clamp the bent part of the reinforcement and slowly apply torque to straighten it gradually, so that the axis of the reinforcement is parallel to the axis of the longitudinal reinforcement 8 of the adjacent rib wall 2; then use welding rods to perform single-sided lap welding, with the weld length controlled at 10d (d is the diameter of the connecting reinforcement 10), and finally confirm that the weld appearance is full and free of pores and slag inclusions.

[0056] In step S5, pouring concrete refers to the construction process of injecting a concrete mixture that meets the design strength grade and durability requirements into the formwork and compacting it. An immersion vibrator can be used for thorough compaction to avoid under-vibration or over-vibration, which could cause residual debris from the foam baffle 6 to mix into the concrete or cause rebar displacement. "Integrated" means that the support piles 1, rib wall 2, and basement exterior wall 3 are physically and mechanically integrated through concrete encapsulation. The connecting rebar 10 is completely encased in the concrete of the rib wall 2, thus achieving effective transfer of shear force and bending moment under stress. Of course, depending on the cross-sectional dimensions and reinforcement density of the rib wall 2, a guide channel and vent holes can be set within the formwork of the rib wall 2 during the pouring process to ensure that the concrete bypasses the dense rebar and fully fills the gap area.

[0057] In summary, the construction method of the present invention can be used to construct a basement exterior wall 3 support system with coordinated support piles 1 bearing the load, resulting in an overall structure with good interface bonding between support piles 1, rib walls 2 and basement exterior wall 3, reliable steel reinforcement anchorage, and concrete strength and density meeting the standards.

[0058] The working principle of the basement exterior wall 3 support system of the present invention with synergistic support pile 1 bearing force is as follows: After the foundation pit is excavated, the support pile 1 is stably embedded in the stratum and has sufficient lateral stiffness; before pouring the rib wall 2, the pre-reserved connecting steel bar 10 on the support pile 1 is straightened and welded to the longitudinal bar 8 in the rib wall 2 formwork, and then the rib wall 2 and the basement exterior wall 3 are poured, so that the support pile 1, the rib wall 2 and the basement exterior wall 3 can be connected as one.

[0059] Example 2 The difference between this embodiment and Embodiment 1 is that the method of reserving the connecting steel bars 10 on the support pile 1 is different.

[0060] In this embodiment, a rotary borehole is drilled around the periphery of the foundation pit to be excavated. The depth of the borehole is greater than the depth of the foundation pit. A support pile 1 template is installed inside the borehole. A notch is made at the position of the rib wall 2 corresponding to the support pile 1 template. One end of the connecting steel bar 10 is welded to the steel cage, and the other end is passed through the template and bent upward. The notch is then sealed with a foam baffle 6 to complete the pre-reservation.

[0061] Specifically, this can be understood as follows: When constructing and pouring the support piles 1 around the foundation pit, foam baffles 6 are used to seal the gaps on the formwork of each support pile 1 near the side where the rib wall 2 is to be set. Connecting steel bars 10 are pre-embedded at this location. One end of the connecting steel bar 10 is firmly connected to the steel cage of the support pile 1, and the other end passes through the foam baffle 6 and bends upward. After the foundation pit is excavated layer by layer to the design elevation, the formwork frame of the basement exterior wall 3 and the rib wall 2 is erected, and the steel skeleton of the basement exterior wall 3 and the rib wall 2 is tied inside the formwork frame. Then, the foam baffles 6 are removed, and the connecting steel bars 10 reserved on the support pile 1 are straightened so that they are aligned with the longitudinal reinforcing bars in the steel skeleton of the rib wall 2. The connection is completed using welding technology that meets the structural welding quality requirements. Finally, the concrete of the basement exterior wall 3 and the rib wall 2 is poured simultaneously, so that the support pile 1, the connecting steel bars 10, the rib wall 2 and the basement exterior wall 3 form an integrated and coordinated force-bearing system.

[0062] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A basement exterior wall support system with synergistic support piles, characterized in that, The system includes an outer wall of the basement, multiple rib walls, and multiple support piles. Each support pile is located on the periphery of the outer wall of the basement, and the multiple support piles are spaced apart along the circumference of the outer wall of the basement. Each of the multiple rib walls corresponds to one of the multiple support piles. The rib walls are located between the outer wall of the basement and the support piles, and each rib wall connects each support pile to the outer wall of the basement as a whole.

2. The basement exterior wall support system with synergistic support piles as described in claim 1, characterized in that, The internal reinforcing bars of the support pile are connected to the internal reinforcing bars of the rib wall.

3. The basement exterior wall support system with synergistic support piles as described in claim 1, characterized in that, The rib wall is integrally cast with the basement exterior wall.

4. The basement exterior wall support system with synergistic support piles according to claim 2, characterized in that, The support pile has a pre-reserved connecting steel bar on the side near the rib wall, and the internal steel bar of the support pile is connected to the internal steel bar of the rib wall through the connecting steel bar.

5. The basement exterior wall support system with synergistic support piles according to claim 4, characterized in that, The diameter of the connecting steel bar is set as d, and the welding length between the connecting steel bar and the internal steel bar of the rib wall is 10d.

6. The basement exterior wall support system with synergistic support piles according to claim 1, characterized in that, The spacing between two adjacent ribs is equal.

7. The basement exterior wall support system with synergistic support piles as described in claim 1, characterized in that, The top of the support pile is provided with a capping beam, which connects multiple support piles into one unit.

8. A basement exterior wall support system with synergistic support piles as described in claim 7, characterized in that, The rib wall is also integrated with the crown beam.

9. A basement exterior wall support system with synergistic support piles as described in claim 1, characterized in that, The cross-section of the rib wall is rectangular.

10. A construction method for a basement exterior wall support system with synergistic support piles as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Cast support piles around the perimeter of the foundation pit to be excavated. At the same time, leave gaps and connecting steel bars at the connection points between each support pile and each rib wall. The gaps are sealed by foam baffles. One end of the connecting steel bar is connected to the internal steel cage of the support pile, and the other end extends out of the support pile through the foam baffle and bends upward. S2. Excavate the foundation pit, and excavate the earthwork layer by layer to the foundation elevation; S3. Erect the formwork for the basement exterior walls and ribs, and install reinforcing bars inside the formwork for the basement exterior walls and ribs. S4. Remove the foam baffle and straighten the pre-reserved connecting steel bars on the support piles and weld them to the steel bars inside the rib wall formwork. S5. Pour concrete inside the formwork of the basement exterior wall and rib wall to complete the construction of the basement exterior wall and rib wall, so that the rib wall connects the support piles with the basement exterior wall as one unit.

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