Complex foundation excavation slope supporting structure

Abstract

The utility model relates to a slope supporting structure for complex foundation excavation. The slope supporting structure comprises enclosure row piles, stiffening rib piles, stiffening rib walls and top beams. The enclosure row piles and the stiffening rib walls are meshed row piles, the stiffening rib piles and the stiffening rib walls are correspondingly arranged on the soil facing sides and the pit facing sides of the enclosure row piles respectively, and the stiffening rib piles, the stiffening rib walls and the enclosure row piles are connected into a whole through the crown beams. Compared with the prior art, the cantilever type enclosure row pile solves the problem that conventional enclosure piles in slope support or large-area foundation pit support engineering in complex stratums such as pebbles, boulders, bed rocks, underground obstacles and artificial foundations cannot be directly constructed, the integrity and rigidity of the traditional cantilever type enclosure row piles are greatly enhanced, the use range of the support form is expanded, and the construction cost is reduced. Materials are saved, the construction period is shortened, slurry pollution is avoided, and good environmental protection and social and economic benefits are achieved.

Description

Technical Field

[0001] This utility model relates to the field of slope protection or foundation pit support design and construction technology, and in particular to a slope protection structure for complex foundation excavation. Background Technology

[0002] Slope protection or foundation pit excavation during urban renewal and renovation projects will face a series of engineering geological and environmental challenges, placing higher demands on engineering design and construction. For example, artificial slopes, artificial fill, underground obstacles, gravel, and bedrock create complex and varied topographical and geological conditions; existing building foundations and old underground facilities form complex underground obstacles; and proximity to important buildings, roads, and pipelines imposes stringent environmental protection requirements. These engineering challenges increase the difficulty of design and construction, raise environmental deformation control standards, and necessitate a balance between technology and economics.

[0003] Traditional pile cantilever support structures are suitable for shallow slopes or foundation pits, but the deformation of the support structure is relatively large. When the excavation depth is deep, pile retaining walls need to be combined with internal supports or external anchoring structures. Slope support generally lacks the conditions for internal support, and anchoring structures exceeding the planned land boundary line violate urban planning. When the underground space excavation area is large, temporary internal supports are uneconomical and affect excavation efficiency. When encountering complex terrain and geological conditions, traditional retaining piles often require prior clearing and backfilling before construction, resulting in numerous construction procedures, long cycles, high costs, and adverse effects on the surrounding environment. In addition, traditional drilled piles and cement-soil mixing piles are prone to borehole collapse and necking, making it difficult to guarantee the quality of the pile body, and the generated waste mud pollutes the environment. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a slope protection structure for complex foundation excavation, which aims to solve practical problems such as the inability to directly construct retaining piles under complex terrain and geological conditions, the limited excavation depth and large deformation of cantilever pile applications, the anchoring structure exceeding the red line, and environmental pollution.

[0005] The above-mentioned utility model objective is achieved through the following technical solution:

[0006] A complex foundation excavation slope protection structure includes retaining piles, stiffening rib piles, stiffening rib walls, and capping beams;

[0007] The retaining piles and the stiffening ribs are interlocking piles. The stiffening ribs and the stiffening ribs are respectively set on the soil-facing side and the pit-facing side of the retaining piles, and the stiffening ribs, the stiffening ribs and the retaining piles are connected into a whole by the capping beam.

[0008] As a further technical solution of this utility model: the interlocking width between the retaining piles meets the requirements of soil retention and water stoppage, and the interlocking width between the piles of the stiffening rib wall meets the requirements of force transmission between the piles.

[0009] As a further technical solution of this utility model: the retaining piles, the stiffening rib piles and the stiffening rib wall are constructed by a full-casing full-rotation drilling rig, which is suitable for complex strata such as gravel, bedrock, underground obstacles and artificial foundations.

[0010] As a further technical solution of this utility model: the stiffening rib piles and the stiffening rib walls are perpendicular to the retaining piles, and the stiffening rib piles and stiffening rib walls are set independently on the soil-facing side or the pit-facing side, or simultaneously on both sides.

[0011] As a further technical solution of this utility model: the number of stiffening ribs, pile diameter, pile length, spacing and row spacing of the stiffening ribs and the stiffening rib walls should be determined by comprehensive calculation in combination with the site construction space, excavation depth and environmental protection requirements.

[0012] As a further technical solution of this utility model: when the stiffening rib wall is set on the side facing the pit, as the excavation depth increases, several waist beams are further set vertically on the side of the retaining piles in the pit for reinforcement. The two ends of the waist beams extend to the stiffening rib wall and are fixed and constrained by shear resistance measures.

[0013] As a further technical solution of this utility model: the support structure is applicable to slope support or foundation pit support engineering. The stiffening rib wall on the pit-facing side is set in conjunction with the settlement joint or post-pouring strip of the underground structure to be built, and construction joints are added when necessary.

[0014] As a further technical solution of this utility model: the crown beam is set on the top of the retaining pile, the stiffening rib pile and the stiffening rib wall, a plurality of the stiffening rib piles are set on one side of the retaining pile, and a plurality of the stiffening rib walls are set on the other side of the retaining pile.

[0015] As a further technical solution of this utility model: the stiffening rib piles and the stiffening rib walls are arranged at uniform intervals.

[0016] As a further technical solution of this utility model, it also includes waist beams, and several waist beams are provided in the retaining piles and stiffening ribs in the pit for reinforcement.

[0017] In summary, this utility model has at least one of the following beneficial technical effects:

[0018] 1. This utility model discloses a slope support structure for complex foundation excavation, which solves the problem that retaining piles cannot be directly constructed under complex terrain and geological conditions. It eliminates the risks of mud slurry, hole collapse, and necking, and achieves high verticality and quality of piles. It can also clear underground obstacles simultaneously, minimizing the impact on the surrounding environment.

[0019] 2. This utility model's retaining structure eliminates the risks of mud slurry, hole collapse, and necking. It achieves high pile verticality and quality, and can simultaneously clear underground obstacles, minimizing its impact on the surrounding environment. When applied to large-area foundation pits, it can save significant amounts of supports and columns, improve excavation efficiency, and offers excellent economic benefits while shortening the construction period.

[0020] 3. This utility model solves the problem of limited excavation depth and large deformation in the application of cantilever piles. It strengthens the traditional cantilever piles by setting stiffening rib piles outside the pit, stiffening rib walls inside the pit, or a combination of both, which can better control the deformation of the support structure.

[0021] 4. When the reinforcing rib wall is set on the side facing the pit, as the excavation depth increases, several waist beams can be set vertically on the side of the retaining piles in the pit to optimize the bending moment of the retaining piles and reduce the deformation of the pile body.

[0022] 5. When applied to slope protection, this utility model can avoid the problem of anchored structures extending beyond the land use boundary line, and can meet the management regulations that support structures must not extend beyond the land use boundary line in some urban construction projects.

[0023] 6. When applied to the excavation and support of large-area foundation pits, this utility model can save a large amount of temporary support structures such as internal supports and columns, improve excavation efficiency, is economical, facilitates construction, and saves construction time. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the support structure in Embodiment 1 of this utility model. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the support structure in Embodiment 1 of this utility model. Figure 2 ;

[0026] Figure 3 This is a top view of the support structure of Embodiment 1 of this utility model;

[0027] Figure 4 This is a side view of the support structure of Embodiment 1 of this utility model;

[0028] Figure 5 This is a front view of the support structure in Embodiment 1 of this utility model;

[0029] Figure 6 This is a rear view of the support structure in Embodiment 1 of this utility model;

[0030] Figure 7 This is a schematic diagram of the support structure in Embodiment 2 of this utility model;

[0031] Figure 8 This is a side view of the support structure in Embodiment 2 of this utility model;

[0032] Figure 9 This is a front view of the support structure in Embodiment 2 of this utility model.

[0033] Attached diagram labels: 1. Retaining piles; 2. Stiffening rib piles; 3. Stiffening rib wall; 4. Crown beam; 5. Waist beam. Detailed Implementation

[0034] 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 some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Example 1:

[0038] Reference Figure 1This utility model discloses a complex foundation excavation slope support structure, including retaining piles 1, stiffening rib piles 2, stiffening rib walls 3, and capping beams 4; the retaining piles 1 and the stiffening rib walls 3 are interlocking piles, the stiffening rib piles 2 and the stiffening rib walls 3 are respectively arranged on the soil-facing side and the pit-facing side of the retaining piles 1, and the stiffening rib piles 2, stiffening rib walls 3 and retaining piles 1 are connected into a whole by the capping beams 4.

[0039] The crown beam 4 is set on the top of the retaining pile 1, the stiffening rib pile 2 and the stiffening rib wall 3. A number of the stiffening rib pile 2 are set on one side of the retaining pile 1, and a number of the stiffening rib wall 3 are set on the other side of the retaining pile 1. The number of stiffening rib pile 2 and the number of stiffening rib wall 3 are evenly spaced.

[0040] On an artificial high-fill roadbed, a slope is excavated on one side, and the support structure is as follows: Figures 1-6 As shown, the structure includes retaining piles 1, stiffening rib piles 2, stiffening rib walls 3, and a capping beam 4. Stiffening rib piles 2 and stiffening rib walls 3 are vertically positioned on the soil-facing side and pit-facing side of retaining piles 1, respectively. Retaining piles 1 use interlocking piles to form a continuous pile wall that serves both as a retaining wall and a water-stopping structure. Stiffening rib piles 2 use a queue-style pile arrangement as an anchoring structure, and stiffening rib walls 3 use interlocking piles to form a continuous pile wall as a support structure. Retaining piles 1, stiffening rib piles 2, and stiffening rib walls 3 are constructed using a full-casing, full-rotation drilling rig. During the drilling process, underground obstacles such as gravel and embankment piles can be simultaneously removed within the casing. The capping beam 4 connects the stiffening rib piles 2, stiffening wall 3, and retaining piles 1 into a unified structure, forming a high-rigidity retaining and water-stopping structure.

[0041] This embodiment provides a single-sided excavation slope support structure for artificial high-fill roadbeds, which solves the problem that excavation slope support piles cannot be directly constructed under adverse geological conditions such as complex artificial foundations and underground obstacles. Based on the traditional cantilever pile structure, a stiffened rib-shaped support structure is formed by combining internal retaining walls and external anchor piles in a limited space. The overall rigidity is high, and the deformation of the support structure can be well controlled.

[0042] Example 2:

[0043] A complex foundation excavation slope protection structure, which differs from Embodiment 1, further includes waist beams 5, and several waist beams 5 are installed on the retaining piles 1 and the stiffening rib wall 3 in the pit for reinforcement.

[0044] In ultra-large-area deep foundation pit projects on riprap and rubble foundations, the foundation pit support structure, such as... Figures 7-9As shown, it includes retaining piles 1, stiffening rib piles 2, stiffening rib walls 3, capping beams 4, and waist beams 5. As the excavation depth increases, in order to control the internal force and deformation of the retaining piles 1, in Example 2, based on Example 1, several waist beams 5 are vertically installed on the side of the retaining piles 1 in the pit. The two ends of the waist beams 5 extend to the stiffening rib walls 3 and are fixed and constrained by shear-resistant measures.

[0045] This embodiment provides a support structure for excavating ultra-large deep foundation pits on complex foundation sites such as riprap and boulders. It solves the problem that traditional support piles cannot be directly constructed on complex foundations, saves a lot of temporary support structures such as internal supports and columns, improves excavation efficiency, and eliminates mud pollution, thus having good environmental protection and socio-economic benefits.

[0046] The implementation principle of this utility model is as follows: This utility model discloses a slope support structure for complex foundation excavation, which solves the problem that retaining piles cannot be directly constructed under complex terrain and geological conditions. It eliminates the risks of mud slurry, hole collapse, and necking, and achieves high verticality and quality of piles. It can also clear underground obstacles simultaneously, with minimal impact on the surrounding environment.

[0047] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A complex foundation excavation slope support structure, characterized by, The retaining row pile (1), the stiffening rib pile (2), the stiffening rib wall (3), and the crown beam (4) are connected into an integral whole by the crown beam (4). The inter-pile occlusion width of the retaining row pile (1) meets the requirements of retaining soil and stopping water, and the inter-pile occlusion width of the stiffening rib wall (3) meets the requirements of force transmission between piles.

2. A complex foundation excavation slope support structure according to claim 1, wherein The retaining row pile (1), the stiffening rib pile (2), and the stiffening rib wall (3) are constructed by a full casing full rotary drilling machine, which is suitable for complex strata such as gravel, bedrock, underground obstacles, and artificial foundations.

3. A complex foundation excavation slope support structure according to claim 1, wherein The stiffening rib pile (2) and the stiffening rib wall (3) are perpendicular to the retaining row pile (1), and the stiffening rib pile (2) and the stiffening rib wall (3) are independently arranged on the soil-facing side or the pit-facing side or arranged on both sides.

4. A complex foundation excavation slope support structure according to claim 1, wherein The number, diameter, length, and spacing of the stiffening rib pile (2) and the stiffening rib wall (3) should be determined comprehensively according to the construction space, excavation depth, and environmental protection requirements.

5. A complex foundation excavation slope support structure according to claim 1, wherein When the stiffening rib wall (3) is arranged on the pit-facing side, with the increase of the excavation depth, a plurality of waist beams (5) are vertically arranged on the side of the retaining row pile (1) in the pit to strengthen it, and the two ends of the waist beam (5) extend to the stiffening rib wall (3) and are fixed and constrained by shear-resistant measures.

6. A complex foundation excavation slope support structure according to claim 1, wherein The supporting structure is suitable for slope support or foundation pit support engineering field, and the stiffening rib wall (3) on the pit-facing side is arranged in combination with the settlement joint or post-poured band position of the underground structure to be built, and a construction joint is added if necessary.

7. A complex foundation excavation slope support structure according to claim 1, wherein The crown beam (4) is arranged at the top of the retaining row pile (1), the stiffening rib pile (2), and the stiffening rib wall (3), a plurality of stiffening rib piles (2) are arranged on one side of the retaining row pile (1), and a plurality of stiffening rib walls (3) are arranged on the other side of the retaining row pile (1).

8. A complex foundation excavation slope support structure according to claim 1, wherein A plurality of stiffening rib piles (2) and a plurality of stiffening rib walls (3) are arranged in uniform intervals.

9. A complex foundation excavation slope support structure according to claim 8, wherein A waist beam (5) is further included, and a plurality of waist beams (5) are arranged on the retaining row pile (1) and the stiffening rib wall (3) in the pit to strengthen them.

10. A complex foundation excavation slope support structure according to claim 1, wherein ​

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