Foundation treatment structure crossing shallow pipe culvert
Through the combined structure of rotary spray piles and micro steel pipe piles, the foundation treatment problem in the shallow buried pipe culvert area is solved, the bearing capacity of the foundation is enhanced and existing equipment is protected, and it is suitable for sites with complex geological conditions and underground pipeline distribution.
Patent Information
- Application Number
- CN202422450599.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-11
AI Technical Summary
The existing foundation treatment technology is limited in the narrow areas where the underground shallow buried pipe culverts and wire mesh are complexly distributed, making it difficult to achieve large-scale excavation and avoid underground buried objects, resulting in construction difficulties and unsafe.
A composite structure is formed by parallel-set rotary spray piles and micro steel pipe piles. A composite foundation treatment structure consisting of a newly built pile bearing and concrete slab through connecting beams, a conical bearing and concrete column are reinforced by high-pressure injection grouting of rotary spray piles to enhance compression, pull-out and shear bearing capacity, and avoid underground pipe culverts and protect existing equipment.
It improves the compressive, pull-out and shear bearing capacity of the foundation, reduces the impact of construction on existing equipment, and is suitable for sites with complex geological conditions and underground pipeline distribution, and has high engineering suitability and promotion.
Smart Images
Figure CN223135176U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building foundation treatment, in particular to a foundation treatment structure spanning shallow culverts. Background Technique
[0002] In recent years, with the substantial improvement of the national economy and the large-scale construction of civil facilities, industrial buildings, etc., the requirements for the settlement deformation, bearing capacity and stability of the foundation have become increasingly strict. Problems of buildings affected by foundation factors emerge in an endless stream, and foundation treatment has become the focus and difficulty concerned by many professionals in the industry.
[0003] Currently, common foundation treatment methods include replacement foundation, rammed foundation, compacted pile foundation, deep compaction foundation, grouting reinforcement, preloading foundation, composite foundation, geosynthetic material foundation, etc. However, this type of technical means is generally only applicable to large-scale construction areas with relatively clear geological conditions and no large-scale pipeline networks, showing the characteristics of "one-size-fits-all". It is still very limited for specific narrow areas with shallowly buried underground culverts, intricate distribution of wire networks, inconvenient large-scale excavation and the need to avoid underground buried objects. Content of the Utility Model
[0004] In view of the deficiencies of the above-mentioned prior art, the utility model provides a foundation treatment structure spanning shallow culverts, which is applicable to sites with complex geological conditions and shallow site pipeline networks, and is convenient for construction, safe and controllable.
[0005] The technical solution provided by the utility model: a foundation treatment structure spanning shallow culverts, including two groups of jet grouting piles arranged in parallel, each jet grouting pile is provided with a micro steel pipe pile, a new pile cap is arranged above the jet grouting pile and the micro steel pipe pile, the new pile caps are connected by a connecting beam, a concrete slab is laid on the upper part of the connecting beam, a tapered pile cap is arranged on the concrete slab, and a concrete column is arranged in the middle of the tapered pile cap.
[0006] Further, a micro steel pipe pile is implanted in each jet grouting pile, and the micro steel pipe pile is anchored in the new pile cap by not less than 500mm.
[0007] Further, a clamping structure is arranged at the top of each micro steel pipe pile, a locking port is arranged on the outside of the clamping structure, a connecting rod is installed between the two locking ports, and the connecting rod is in an "X" shape to fix adjacent micro steel pipe piles.
[0008] Further, the clamping structure adopts a hoop, and the connecting rod adopts a prestressed anchor cable, which is anchored and locked through the locking port to connect all the micro steel pipe piles into a whole.
[0009] Further, an anti-slip structure is arranged on the micro steel pipe pile at intervals of 2-5m.
[0010] Furthermore, the anti-slip structure is formed by bending and welding more than 3 hot-rolled ribbed steel bars with a diameter of not less than 20 mm.
[0011] Furthermore, the bottom of the micro steel pipe pile is made into a tip, and C40 slightly expanded concrete is poured into it.
[0012] Furthermore, the jet grouting pile adopts high-pressure double-pipe grouting, the effective pile diameter is not less than 600 mm, the plane positioning error of the pile position is not more than 5 cm, the deviation of the drilling verticality is not more than 1%, and the unconfined compressive strength of the jet grouting pile at 28 d age is not less than 0.8 MPa.
[0013] Furthermore, the concrete slab forms a slab foundation and is poured on the continuous beam. It is connected by the reinforcement reserved in the concrete slab. The conical bearing platform steel cage is welded on the concrete slab, and the conical bearing platform is formed by pouring. The continuous beam maintains a safe distance from the buried pipe culvert below.
[0014] Furthermore, the thickness of the concrete slab is not less than 300 mm and is poured with C30 concrete.
[0015] The utility model is applicable to sites with special working environments, complex geological conditions, and intricate distribution of underground pipe culverts. The "jet grouting pile - micro steel pipe pile" is formed to form a stress pile body that jointly bears the building load and external load. The micro steel pipe pile mainly transfers the pile top load to the jet grouting pile through the friction force around the pile, and the jet grouting pile then transfers it to the soil around the pile through its friction force around the pile, thus completing the load transfer function. By setting the continuous beam to strengthen the connection of the four newly built pile foundation bearing platforms, while reducing the workload of large-area concrete pouring, it also greatly improves the compressive bearing capacity, uplift bearing capacity, and shear bearing capacity of the "jet grouting pile - micro steel pipe pile" composite pile body. The utility model gives full play to the high-strength compressive characteristics of the micro steel pipe pile, utilizes the high-pressure jet grouting reinforcement effect of the jet grouting pile to form a large contact area with the soil around the pile, enhances the compressive bearing capacity, uplift bearing capacity, and shear bearing capacity of the combined pile body, etc. And the continuous beam cleverly avoids the shallow buried pipe culvert buried objects, protects the existing equipment from being damaged by construction, and reforms and strengthens the foundation in the construction area, with extremely high engineering suitability and popularization. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is the plan view of the utility model;
[0017] Figure 2 is the Figure 1 enlarged view at A in the
[0018] Figure 3 is the transverse sectional view of the utility model;
[0019] Figure 4It is the elevation schematic diagram of the connection structure of the micro steel pipe piles of the present utility model;
[0020] Figure 5 It is the pile forming flow chart of the present utility model.
[0021] In the figure: 1 - jet grouting pile; 2 - micro steel pipe pile; 201 - clamping structure; 202 - lock; 203 - anti-slip structure; 3 - newly built pile cap; 4 - connecting rod; 5 - connecting beam; 6 - concrete slab; 7 - conical pile cap; 701 - bottom of the conical pile cap; 702 - top of the conical pile cap; 8 - concrete column; 9 - culvert. Specific embodiments
[0022] The following further describes the present utility model in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present utility model. In order to better illustrate the specific embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted. Based on the specific embodiments of the present utility model, all other specific embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.
[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "front", "rear", "upper", "lower", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0025] Such as Figures 1-5A foundation treatment structure for spanning a shallow culvert is shown, including two groups of jet grouting piles 1 arranged in parallel. A micro steel pipe pile 2 is arranged in each jet grouting pile. Above the jet grouting piles 1 and the micro steel pipe piles 2, a newly built pile cap 3 is provided. The newly built pile caps 3 are connected by a continuous beam 5. A concrete slab 6 is laid on the upper part of the continuous beam 5. A tapered pile cap 7 is arranged on the concrete slab 6, and a concrete column 8 is arranged in the middle of the tapered pile cap 7.
[0026] A micro steel pipe pile 2 is implanted in each jet grouting pile 1. The pile center of the micro steel pipe pile 2 coincides with the pile center of the jet grouting pile 1 and is anchored in the newly built pile cap 3 for no less than 500 mm. A clamping structure 201 is arranged at the top of each micro steel pipe pile 2. A locking groove 202 is arranged on the outside of the clamping structure 201. A connecting rod 4 is installed between the two locking grooves 202. The connecting rod 4 is in an "X" shape to fix adjacent micro steel pipe piles 2. The clamping structure 201 adopts a hoop, and the connecting rod 4 adopts a prestressed anchor cable. Through the anchoring and locking of the locking groove 202, all the micro steel pipe piles 2 are connected into a whole, and the force is balanced and evenly distributed.
[0027] An anti-slip structure 203 is installed on the micro steel pipe pile 2 at intervals of 2 - 5 m. The anti-slip device 203 enhances the casting integrity and stability between the micro steel pipe pile 2 and the jet grouting pile 1. The anti-slip structure 203 is formed by bending and welding more than 3 hot-rolled ribbed steel bars with a diameter of not less than 20 mm. The bottom of the micro steel pipe pile 2 is made into a tip, and C40 micro-expansion concrete is poured into it, with a height of about 1.0 m. It can be implanted and pressed only when the concrete reaches the design strength.
[0028] The jet grouting pile 1 adopts high-pressure double-tube grouting, and the effective pile diameter is not less than 600 mm. The pressure of the high-pressure cement slurry is not less than 25 Mpa, the air pressure is not less than 0.7 Mpa, and the lifting speed is between 0.15 - 0.25 m / min. The cement adopts P.O 42.5 ordinary Portland cement, and the dosage is not less than 350 kg / m. The grouting material is pure cement slurry with a water-cement ratio of 1.0. The grouting pressure can be appropriately increased according to the actual soil layer conditions on site to achieve a larger effective grouting radius. The plane positioning error of the pile position should not be greater than 5 cm, and the deviation of the drilling verticality should not be greater than 1%. The unconfined compressive strength of the jet grouting pile 1 at 28 d age should not be lower than 0.8 MPa.
[0029] The concrete slab 6 forms a plate-like foundation and is cast on the connecting beam 5. The conical cap steel cage is welded on the concrete slab 6 through the reserved steel bar anchor connection of the concrete slab 6, and the conical cap 7 is cast. The connecting beam 5 connects four newly built pile caps 3. The connecting beam 5 is anchored in the newly built pile cap 3 with a length of not less than 300mm. A connecting beam 5 is set around and in the center of the entire raft foundation. The force center of the conical cap 7 coincides with the center point of the middle connecting beam 5. A large area concrete slab 6 is laid on the connecting beam 5 to expand the foundation force area, which is conducive to the vertical pressure dispersion. The thickness of the concrete slab 6 is not less than 300mm and C30 concrete is used for casting. The connecting beam 5 should maintain a safe distance from the lower deep buried pipe culvert 9 to avoid cracking and damage of the pipe culvert 9 caused by foundation sinking. The specific location and buried depth of the pipe culvert 9 should be explored and clarified before construction. The buried depth and size of the foundation should be reviewed before foundation treatment construction, and construction can only be carried out after confirmation.
[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A foundation treatment structure for spanning shallow culverts, characterized in that: It includes two groups of jet grouting piles (1) arranged in parallel. Each jet grouting pile is provided with a micro steel pipe pile (2). Above the jet grouting piles (1) and the micro steel pipe piles (2), there is a newly built pile cap (3). The newly built pile caps (3) are connected by a connecting beam (5). A concrete slab (6) is laid on the upper part of the connecting beam (5). A tapered pile cap (7) is arranged on the concrete slab (6). A concrete column (8) is arranged in the middle of the tapered pile cap (7).
2. The ground treatment structure for spanning shallow culverts according to claim 1, wherein: Each of the jet grouting piles (1) is implanted with a micro steel pipe pile (2), and the micro steel pipe pile (2) is anchored in the newly built pile cap (3) for not less than 500 mm.
3. The ground treatment structure for crossing a shallow culvert according to claim 2, characterized in that: At the top of each micro steel pipe pile (2), there is a clamping structure (201). A locking groove (202) is arranged on the outside of the clamping structure (201). A connecting rod (4) is installed between two locking grooves (202). The connecting rod (4) is in an "X" shape to fix adjacent micro steel pipe piles (2).
4. A foundation treatment structure for crossing a shallow culvert according to claim 3, characterized in that: The clamping structure (201) adopts a hoop. The connecting rod (4) adopts a prestressed anchor cable. Through anchoring and locking by the locking groove (202), all the micro steel pipe piles (2) are connected into a whole.
5. A foundation treatment structure for crossing a shallow culvert, as claimed in claim 1, wherein: Anti-sliding structures (203) are arranged on the micro steel pipe piles (2) at intervals of 2 - 5 m.
6. The ground treatment structure for crossing a shallow culvert according to claim 5, characterized in that: The anti-sliding structure (203) is formed by bending and welding more than 3 hot-rolled ribbed steel bars with a diameter of not less than 20 mm.
7. A foundation treatment structure for crossing a shallow culvert, according to claim 1, characterized in that: The bottom of the micro steel pipe pile (2) is made into a tip, and C40 micro-expansion concrete is poured into it.
8. A foundation treatment structure for crossing shallow pipe culverts according to claim 1, characterized in that: The jet grouting pile (1) adopts high-pressure double-tube grouting. The effective pile diameter is not less than 600 mm. The plane positioning error of the pile position is not more than 5 cm. The deviation of the drilling verticality is not more than 1%. The unconfined compressive strength of the jet grouting pile (1) at 28-day age is not less than 0.8 MPa.
9. The ground treatment structure for crossing a shallow culvert according to claim 1, wherein: The concrete slab (6) forms a slab foundation and is poured on the connecting beam (5). Through the anchoring connection of the reserved steel bars of the concrete slab (6), a tapered pile cap steel reinforcement cage is welded on the concrete slab (6), and the tapered pile cap (7) is formed by pouring. The connecting beam (5) keeps a safe distance from the buried culvert (9) below.
10. A foundation treatment structure for crossing shallow culverts according to claim 1, characterized in that: The thickness of the concrete slab (6) is not less than 300 mm, and it is poured with C30 concrete.