Supporting structure for internally cutting cement-soil mixing pile into cast-in-place pile
By adopting a support structure of cast-in-place piles with in-line cement-soil mixing piles in the foundation pit project, and by combining multiple rows of cement-soil mixing piles and cast-in-place piles, a waterproof curtain and support are formed, which solves the problem of drilling difficulties and hole collapse in water-rich soft strata, and ensures the safety of the foundation pit project and the stability of surrounding buildings.
Patent Information
- Application Number
- CN202520046258.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-01-09
AI Technical Summary
In water-rich and soft strata, foundation pit construction is difficult to drill, and the holes are prone to collapse, making it difficult to ensure the safety of the project and the stability and safety of surrounding buildings. Especially in urban river and canal sections, construction space is limited, and existing support structures are difficult to effectively stop water and provide support.
The support structure adopts cast-in-place piles with incised cement-soil mixing piles, including a support pile structure symmetrically arranged on both sides and a foundation reinforcement zone. Multiple rows of interlocking cement-soil mixing piles are used as a water-stop curtain and support, combined with multiple cast-in-place piles arranged at intervals to form a waterproof curtain and support, thereby enhancing the stability and bending resistance of the foundation.
It effectively solved the problems of difficult drilling and hole collapse, improved the stability and integrity of the foundation, reduced construction vibration and noise, had little impact on the surrounding environment, and ensured the safety of the foundation pit project and the stability of existing buildings.
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Figure CN223688929U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to foundation pit engineering technical field, more specifically, relate to a support structure of bored pile internal cutting cement soil mixing pile. BACKGROUND
[0002] At present, underground engineering develops rapidly in China, and foundation pit engineering is more and more, various kinds of foundation pit support technology is widely used in foundation pit engineering, to ensure the feasibility and safety of foundation pit engineering. The commonly used foundation pit support technology is sheet pile, pipe pile, steel sheet pile, cement soil mixing pile, bored pile, underground continuous wall etc., under normal circumstances, foundation pit engineering adopts one kind to support.
[0003] When the foundation pit engineering is in the intensive area of house and lifeline engineering, it is necessary to reduce the influence of hole collapse and stress release on house settlement in the process of pile forming, to ensure the normal use and safe operation of existing buildings and structures. When the foundation pit engineering is excavated in poor geological conditions, especially in the river channel section of the city, the surrounding houses are dense, the construction operation area is small, the underground belongs to the rich water soft stratum, the soil layer shear capacity is weak, the water content is more, the supporting pile construction is difficult to form a hole, and it is easy to collapse the hole, which is difficult to guarantee the safety of the project and personnel.
[0004] Therefore, for the rich water soft stratum, the surrounding adjacent existing houses, and the river channel section of the city, the foundation pit excavation needs to study an effective support structure to ensure the stability and safety of the foundation pit engineering in the soft area, and to reduce the adverse effects on the surrounding adjacent houses. UTILITY MODEL CONTENT
[0005] The utility model aims at providing a support structure of bored pile internal cutting cement soil mixing pile, which is used for the foundation pit excavation of the rich water soft stratum, the surrounding adjacent existing houses and the river channel section of the city, to guarantee the water stop effect of the support structure and solve the problems of bored pile hole forming difficulty and hole collapse under the condition of small construction operation area, so as to guarantee the stability and safety of the foundation pit engineering and ensure the normal use and safe operation of the existing houses.
[0006] To realize the above-mentioned purpose, the utility model provides a support structure of bored pile internal cutting cement soil mixing pile, which comprises: two sides symmetrical support pile structures, a basement reinforcement area connected between the two sides support pile structures;
[0007] Each side support pile structure comprises a plurality of rows of first cement soil mixing piles engaged with each other, and a plurality of spaced bored piles formed by drilling and cutting in the plurality of rows of first cement soil mixing piles;
[0008] The base reinforcement area is arranged at the lower side of the U-shaped groove to be excavated, and the base reinforcement area comprises a plurality of rows of second cement-soil mixing piles which are mutually engaged.
[0009] Further, the support pile structure on each side comprises three rows of first cement-soil mixing piles which are mutually engaged.
[0010] Further, the first cement-soil mixing piles and the second cement-soil mixing piles are each any one of a single-shaft cement-soil mixing pile, a double-shaft cement-soil mixing pile or a triple-shaft cement-soil mixing pile.
[0011] Further, the plurality of cast-in-place piles are arranged in a “-” shape within the plurality of rows of first cement-soil mixing piles.
[0012] Further, the thickness of the base reinforcement area is 3-5 m according to design.
[0013] Further, the base reinforcement area further comprises two symmetrically arranged concrete crown beams which are connected to the upper side of the support pile structure.
[0014] Further, the base reinforcement area further comprises a plurality of spaced-apart concrete supports, and the two ends of each concrete support are connected to the two concrete crown beams.
[0015] Further, the concrete strength grade of the cast-in-place piles is not less than C25.
[0016] Further, the concrete strength grade of the cast-in-place piles is ordinary Portland cement of C32.5 or C42.5.
[0017] Further, the allowable deviation of the pile body verticality of the cast-in-place piles is ±1 / 100.
[0018] Further, the allowable deviation of the pile body verticality of the first cement-soil mixing piles and the second cement-soil mixing piles is ±1 / 150.
[0019] Compared with the prior art, the utility model has the following technical effects:
[0020] The utility model discloses a support structure of bored pile internal cutting cement soil mixing pile which is symmetrical with the support pile structure on both sides of the U-shaped groove to be excavated and sets up the basement reinforcing area under the U-shaped groove to be excavated, uses the first cement soil mixing pile of a plurality of occlusal settings as the waterproof curtain, and a plurality of interval settings of the bored pile as the support structure, and the cement soil mixing pile can reinforce the soft soil layer, and the stability and integrity of the soft soil are better, and the cement soil mixing pile can be occluded with each other to be used as the waterproof curtain and prevent water seepage, and a plurality of cement soil mixing piles can effectively solve the hole forming difficulty and hole collapse problem in the bored pile construction process. In addition, the bored pile has large rigidity, strong bending resistance and relatively small pile body deformation, and is favorable for ensuring the safety of the existing building near the foundation pit. Through the combined application of the plurality of cement soil mixing piles and the bored pile, the effect of retaining soil and water and facilitating the pile foundation construction can be achieved, and the support capacity for the upper U-shaped groove to be excavated is strong. On the other hand, the basement reinforcing area arranged under the U-shaped groove to be excavated can improve the strength, foundation bearing capacity and stability of the soil body. The support structure of the utility model can prevent the deformation and collapse of the foundation pit under the condition that the construction operation surface is small, and ensure the construction safety.
[0021] The support structure of the bored pile internal cutting cement soil mixing pile has mature construction technology, easy construction quality control, small required construction operation surface, small vibration and noise generated in construction, small influence on the surrounding environment, good applicability for underwater construction, and can ensure the safety of the foundation pit excavation. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without paying creative labor.
[0023] Figure 1 The utility model provides a kind of support structure of bored pile internal cutting cement soil mixing pile of section structure schematic view for embodiment of the utility model;
[0024] Figure 2 The utility model provides a kind of support structure of bored pile internal cutting cement soil mixing pile of plane structure schematic view for embodiment of the utility model;
[0025] Figure 3 A kind of support structure of bored pile internal cutting cement soil mixing pile provided by the utility model embodiment is the plane structure schematic view at basement reinforcing area place;
[0026] Figure 4 The utility model provides a kind of support pile structure including uniaxial cement soil mixing pile schematic view for embodiment of the utility model.
[0027] Figure 5 A schematic diagram of a supporting pile structure including a double-shaft cement-soil mixing pile provided by the embodiment of the present utility model;
[0028] Figure 6 A schematic diagram of a supporting pile structure including a triple-shaft cement-soil mixing pile provided by the embodiment of the present utility model.
[0029] In the drawings, various reference signs represent:
[0030] 1, first cement-soil mixing pile, 2, cast-in-place pile, 3, second cement-soil mixing pile, 4, U-shaped groove, 5, concrete crown beam, 6, concrete support. DETAILED DESCRIPTION
[0031] In order to make the technical problems, technical solutions and beneficial effects of the present utility model clearer and more apparent, the present utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and do not limit the present utility model.
[0032] In the present utility model, the term "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after it are in an "or" relationship.
[0033] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0034] It should be understood that the terms "length", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model.
[0035] The terms used in the embodiments of the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The singular forms "a", "said" and "the" used in the embodiments of the present utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.
[0036] The terms "first", "second", etc. are only used for descriptive purposes and are used to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.
[0037] Please refer to Figures 1-6 A supporting structure of a bored pile inner cutting cement soil mixing pile according to an embodiment of the present application will be described.
[0038] In an embodiment of the present application, the supporting structure of the bored pile inner cutting cement soil mixing pile according to an embodiment of the present application comprises: two side symmetrical supporting pile structures, and a base reinforcement area connected between the two side supporting pile structures; each side supporting pile structure comprises a plurality of rows of first cement soil mixing piles 1 that are mutually engaged, and a plurality of bored piles 2 formed by drilling and cutting in the plurality of rows of first cement soil mixing piles 1; the base reinforcement area is arranged at the lower side of a U-shaped groove 4 to be excavated, and comprises a plurality of rows of second cement soil mixing piles 3 that are mutually engaged, and the two sides of the base reinforcement area are respectively connected with the lower parts of the two side supporting pile structures.
[0039] In the present embodiment, the first cement soil mixing pile 1 and the second cement soil mixing pile 3 refer to using cement (or lime) and other materials as a curing agent, using a special mixing machine to spray slurry or mist powder into soft soil while drilling, and forcibly mixing the soft soil and the soft soil curing agent at the deep foundation to make the curing agent in the soft soil fully mixed with the soft soil. Due to the active ingredients in the curing agent, a series of physical and chemical reactions can occur with the mineral components in the soft soil, so that the soft soil is hardened to form a vertical reinforcement body with water stability, integrity and much greater strength than natural soft soil. The bored pile 2 refers to forming a pile hole in the foundation soil through mechanical drilling, steel pipe soil compaction or manual excavation at the construction site, and placing a reinforcement cage and pouring concrete in the pile hole to form a pile.
[0040] The technical parameters of the first cement soil mixing pile 1 and the second cement soil mixing pile 3 are as follows:
[0041] (1) The foundation treatment range is determined according to the foundation pit range, and the pile diameter is determined according to the foundation bearing capacity and deformation requirements.
[0042] (2) The adjacent first cement soil mixing piles 1 and the adjacent second cement soil mixing piles 3 are mutually engaged.
[0043] (3) The ground should be leveled before the cement soil mixing pile construction, and the obstacles on the ground and underground should be removed.
[0044] (4) The cement-soil mixing pile can be constructed by dry method or wet method, and the mortar spraying lifting speed and times of the mixer should meet the requirements of the construction technology.
[0045] (5) After the cement-soil mixing pile is formed, the verticality tolerance of the pile body should be ±1 / 150.
[0046] The technical parameters of the cast-in-place pile 2 are as follows:
[0047] (1) The diameter of the cast-in-place pile 2 is determined according to the stress calculation.
[0048] (2) The concrete strength grade of the cast-in-place pile 2 should not be lower than C25, and C30 is usually used. The commonly used cement grade is C32.5 or C42.5 ordinary portland cement. The reinforcement is made of grade I and grade II, and the main reinforcement is usually made of threaded steel bar, and the spiral stirrup is made of round steel.
[0049] (3) The cast-in-place piles 2 are arranged at intervals within the cement-soil mixing pile treatment range, and in the case of better soil, the pile spacing can be appropriately expanded by fully utilizing the "soil arch" effect of the pile side.
[0050] (4) The cast-in-place pile 2 is formed by rotary drilling, and after hole cleaning and mortar replacement, the reinforcement cage is lowered and the concrete is poured.
[0051] (5) The verticality tolerance of the cast-in-place pile body is ±1 / 100.
[0052] The supporting structure of the cast-in-place pile inner cement-soil mixing pile in the utility model embodiment is characterized in that the supporting pile structure is symmetrically arranged on the left and right sides of the to-be-excavated U-shaped groove 4, and the base reinforcement area is arranged on the lower side of the to-be-excavated U-shaped groove 4, a plurality of first cement-soil mixing piles 1 arranged in engagement are used as a waterproof curtain, and a plurality of cast-in-place piles 2 arranged at intervals are used as the supporting structure. The cement-soil mixing pile 1 can reinforce the soft soil layer, so that the stability and integrity of the soft soil are better, and the cement-soil mixing piles 1 can be used as a waterproof curtain by mutual engagement, so as to prevent water seepage. A plurality of cement-soil mixing piles 1 can effectively solve the problems of hole forming difficulty and hole collapse in the construction process of the cast-in-place pile 2. In addition, the cast-in-place pile 2 has large rigidity, strong bending resistance, and relatively small pile body deformation, which is beneficial to ensuring the safety of the existing buildings near the foundation pit. Through the combined application of the plurality of cement-soil mixing piles 1 and the cast-in-place pile 2, the effect of retaining soil and water, facilitating pile foundation construction, and having strong supporting capacity for the upper to-be-excavated U-shaped groove 4 can be achieved. On the other hand, since there is deep and weak soft soil layer in the channel range, the soft soil layer has high compressibility, low foundation bearing capacity and poor engineering properties, and the base reinforcement area arranged on the lower side of the to-be-excavated U-shaped groove 4 can improve the strength, foundation bearing capacity and stability of the soil body. The supporting structure of the utility model embodiment can prevent the deformation and collapse of the foundation pit under the condition of small construction operation surface, and ensure the construction safety.
[0053] The construction technology of the supporting structure of the bored pile inner cut cement soil mixing pile is mature, the construction quality is easy to control, the required construction operation surface is smaller, vibration and noise generated in construction are smaller, the influence on the surrounding environment is smaller, and the supporting structure has good applicability for underwater construction, and can guarantee the safety of foundation pit excavation.
[0054] Further, when the channel foundation pit is excavated in the urban area, there are soft soil layers such as silt soil, and there are many buildings in the range of 1 times the foundation pit depth, because the foundation pit to be excavated is very close to the building, and the site around the foundation pit is very narrow, if the construction supporting structure of the first cement soil mixing pile 1 cooperating with the bored pile 2 is arranged in two rows and is engaged with each other, the application requirement cannot be met, in this case, the supporting pile structure on each side is designed to include three rows of first cement soil mixing piles 1 engaged with each other. The water stopping effect of the three rows of first cement soil mixing piles 1 engaged with each other is better, the waterproof effect is good; it is more convenient for the large-diameter bored pile 2 to form a hole, the probability of pile body hole collapse and hole shrinkage is lower, so that the foundation pit depth range is wider; the foundation pit deformation control is better, and the influence on the surrounding buildings is smaller; it is more suitable for silt and other soft soil layers, especially the river channel section in the urban area.
[0055] Further, in the embodiment, the first cement soil mixing pile 1 and the second cement soil mixing pile 3 are each any one of a single-shaft cement soil mixing pile, a double-shaft cement soil mixing pile and a triaxial cement soil mixing pile, and the specific selection can be made according to the construction site requirement. Figures 4-6 The structure forms of the supporting pile structure including the single-shaft cement soil mixing pile, the double-shaft cement soil mixing pile and the triaxial cement soil mixing pile are respectively shown.
[0056] Further, in the embodiment, the plurality of bored piles 2 are arranged in a “one” shape in the plurality of first cement soil mixing piles 1, so as to play a good supporting role.
[0057] Further, in the embodiment, the thickness of the foundation reinforcement area is 3-5 m according to the design, for example, can be 3 m, and the setting of the foundation reinforcement area with the appropriate thickness can better improve the strength, foundation bearing capacity and stability of the soil body.
[0058] Further, the supporting structure of the embodiment further includes two-side symmetrically arranged concrete crown beams 5, and the concrete crown beams 5 are connected to the upper side of the supporting pile structure. All pile foundations on one side of the foundation pit are connected together through the concrete crown beams 5, so as to prevent collapse of the edge of the foundation pit.
[0059] Further, the supporting structure of the embodiment further includes a plurality of interval arranged concrete supports 6, and the two ends of each concrete support 6 are connected with the concrete crown beams 5 on the two sides respectively. The overall stability of the supporting structure can be strengthened by arranging the plurality of interval arranged concrete supports 6.
[0060] The embodiment also provides a construction method of the supporting structure of the cement-soil mixing pile in the bored pile, comprising the following steps:
[0061] First step: construction preparation, performing construction site leveling work, taking high cushion low, removing obstacles, and ensuring three passes (water, electricity, and road).
[0062] Second step: positioning the mixer to the designated pile position and centering, and mixing the cement paste according to the mixing ratio determined according to the design.
[0063] Third step: starting the mixer, spraying and rotating at the same time. After the mixer sinks to the designed depth, stop spraying and start mixing and lifting.
[0064] Fourth step: repeating the second step and the third step until the cement paste is sprayed, and then cleaning the residual cement paste in the pipe, that is, the pile is completed.
[0065] Fifth step: repeating the second step and the fourth step, and constructing all cement-soil mixing piles (including the first cement-soil mixing pile 1 and the second cement-soil mixing pile 3), and the adjacent cement-soil mixing piles are mutually engaged.
[0066] Sixth step: determining the center point of the bored pile 2 between the first cement-soil mixing pile 1, and positioning and sinking the drilling machine. The initial drilling speed should not be too fast, and should be ≦2 m / h within the hole depth of 4.0 m, and should be ≦3 m / h thereafter. The drilling speed is adapted to the mud discharge amount, the mud index change is frequently tested, and the mud concentration in the hole is adjusted.
[0067] Seventh step: after the hole is drilled, the hole is cleaned.
[0068] Eighth step: manufacturing the reinforcement cage, and inserting the reinforcement cage into the specified depth.
[0069] Ninth step: pouring the concrete, and the actual pouring height of the concrete should be higher than the designed pile top elevation by a certain height.
[0070] Tenth step: repeating the sixth step to the ninth step, and constructing the remaining bored piles 2, and finally constructing the concrete crown beam 5 and the concrete support 6 on the pile top.
[0071] The above embodiment only expresses several implementation manners of the utility model, the description is more specific and detailed, but can not be understood as the limitation of the utility model patent range. It should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the utility model, a plurality of deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.
Claims
1. A support structure of a soil-cement mixing pile in a bored pile, characterized by, The invention relates to a supporting structure for a U-shaped trench, comprising: two symmetrically arranged supporting pile structures, and a foundation reinforcement area connected between the two supporting pile structures; each of the supporting pile structures comprises a plurality of rows of first cement-soil mixing piles that are interlocked, and a plurality of spaced cast-in-place piles formed by drilling and cutting in the plurality of rows of first cement-soil mixing piles; the foundation reinforcement area is arranged below the U-shaped trench to be excavated, and comprises a plurality of rows of second cement-soil mixing piles that are interlocked, and the two sides of the foundation reinforcement area are respectively connected with the lower parts of the two supporting pile structures.
2. The support structure for the soil-cement mixing pile in a cast-in-place pile according to claim 1, characterized in that, each of the supporting pile structures comprises three rows of first cement-soil mixing piles that are interlocked; and / or each of the first cement-soil mixing piles and the second cement-soil mixing piles is any one of a uniaxial cement-soil mixing pile, a biaxial cement-soil mixing pile, and a triaxial cement-soil mixing pile.
3. The support structure for the soil-cement mixing pile in the cast-in-place pile according to claim 1, characterized in that, The plurality of cast-in-place piles are arranged in a "one" shape in the plurality of rows of first cement-soil mixing piles.
4. The support structure for the soil-cement mixing pile in a cast-in-place pile according to claim 1, characterized in that, The thickness of the foundation reinforcement area is 3-5 m according to design.
5. A support structure for soil-cement mixing piles within a cast-in-place pile according to any one of claims 1 to 4, wherein The invention further comprises two symmetrically arranged concrete crown beams connected to the upper sides of the supporting pile structures.
6. The support structure for the soil-cement mixing pile within the cast-in-place pile according to claim 5, characterized in that, The invention further comprises a plurality of spaced concrete supports, and the two ends of each of the concrete supports are respectively connected with the two concrete crown beams.
7. The support structure for the soil-cement mixing pile within the cast-in-place pile according to claim 6, characterized in that, The concrete strength grade of the cast-in-place piles is not less than C25.
8. The support structure for the soil-cement mixing pile within the cast-in-place pile according to claim 7, characterized in that, The concrete strength grade of the cast-in-place piles is C32.5 or C42.5 ordinary portland cement.
9. The support structure for the soil-cement mixing pile within the cast-in-place pile according to claim 6, characterized in that, The allowable deviation of the pile body verticality of the cast-in-place piles is ±1 / 100.
10. The support structure for the soil-cement mixing pile within the cast-in-place pile according to claim 6, characterized in that, The allowable deviation of the pile body verticality of the first cement-soil mixing piles and the second cement-soil mixing piles is ±1 / 150.