A blind drain structure of deep filling ground foundation

Abstract

The utility model relates to a blind ditch drainage structure technical field especially for a blind ditch drainage structure of deep thick fill ground, upper filter layer, the upper filter layer's upper side is paved with geogrid, middle part water guide layer, the middle part water guide layer is located the below of upper filter layer, and the middle part water guide layer includes a plurality of filter pipe spare that flatly sets up, fills the layer, the layer of filling is paved the below of middle part water guide layer, drainage tunnel structure, the drainage tunnel structure is located the below of filling layer, is used for to the water flow and carries out the discharge, the filter layer, the filter layer is located the bottom layer, and the filter layer extends to the bottom of upper filter layer along both sides, the utility model discloses through setting up multilayer coordinated filtration and water guide system, has realized efficient grading filtration, can effectively intercept the fine particle of different particle size in the soil, has delayed the occurrence of silting up significantly, thereby has greatly prolonged the service life of blind ditch system, has reduced the demand and the repeated disturbance to the foundation stability of frequent excavation maintenance.

Description

Technical Field

[0001] This utility model relates to the field of blind ditch drainage structure technology, specifically a blind ditch drainage structure for a deep filled soil foundation. Background Technology

[0002] Deep fill foundations refer to special foundations formed by artificial backfilling, typically exceeding 5 meters in thickness. They are widely used in urban new area development, industrial park site leveling, mountain slope cutting and valley filling projects, and large-scale infrastructure construction. The fill soil composition of this type of foundation is complex, often containing construction waste, sand, clay, and boulders. It is characterized by high porosity, low permeability, and strong compressibility. Under the influence of self-weight consolidation, external loads, and rainfall infiltration, it is prone to long-term settlement and pore water pressure accumulation. If drainage is not timely, it may lead to engineering problems such as foundation instability, building tilting and cracking, and damage to underground pipelines.

[0003] Currently, traditional technologies for drainage of backfill foundations mainly rely on gravel blind drains, single permeable pipe blind drains, and planar drainage networks. Traditional blind drains often use single-size crushed stone or ordinary geotextile to wrap the permeable pipe. The filter material gradation is unreasonable and cannot effectively intercept fine particles in the backfill. Over time, fine particles gradually accumulate in the pores of the filter material, resulting in a low permeability coefficient. Usually, excavation and cleaning are required every 1-2 years, which is costly and affects the stability of the foundation.

[0004] Therefore, a blind drain structure with a deep backfill foundation is needed to improve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a blind drain structure for a deep backfill foundation to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A blind drain drainage structure with a deep fill foundation includes, Upper filter layer, on which a geogrid is laid; A central water guiding layer is located below the upper filter layer, and the central water guiding layer includes a plurality of flatly arranged filter pipes; A fill layer, which is laid below the central water-conducting layer; A drainage tunnel structure, located below the fill layer, is used to discharge water. A reverse filter layer, which is located at the bottom layer and extends along both sides to the bottom of the upper filter layer.

[0007] As a preferred embodiment of this utility model, the water filter pipe includes an outer pipe, and a PVC permeable pipe is provided inside the outer pipe. The PVC permeable pipe has a honeycomb structure, and each PVC permeable pipe is provided with an elastic sponge inside.

[0008] As a preferred embodiment of this utility model, a permeable geotextile is provided on the outer side of the outer tube.

[0009] As a preferred embodiment of this utility model, the outer tube has several openings a on its outer side, and the PVC permeable pipe has several openings b on its outer side.

[0010] As a preferred embodiment of this utility model, the upper filter layer is made of ceramsite filter material, and the particle size of the ceramsite filter material is 5-10mm.

[0011] As a preferred embodiment of this utility model, the drainage tunnel structure includes a main concrete diversion channel disposed below the fill layer, and side concrete diversion channels are respectively disposed on both sides of the main concrete diversion channel. The bottom surfaces of both the main concrete diversion channel and the side concrete diversion channels are arc-shaped.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention achieves efficient graded filtration by setting up a multi-layered synergistic filtration and water guiding system. It can effectively intercept fine particles of different sizes in the fill soil, significantly delay the occurrence of siltation and blockage, thereby greatly extending the service life of the blind drain system, reducing the need for frequent excavation and maintenance and repeated disturbance to the stability of the foundation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the water guide pipe fitting in this utility model.

[0014] In the diagram: 1. Geogrid; 2. Upper filter layer; 3. Filter pipe fittings; 31. Permeable geotextile; 32. Outer pipe; 33. Opening a; 34. PVC permeable pipe; 35. Elastic sponge; 4. Filling layer; 5. Side concrete diversion channel; 6. Main concrete diversion channel; 7. Reverse filter layer. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Please see Figure 1-2 This utility model provides a technical solution: For an example, please refer to... Figure 1 , 2 A blind drain structure for deep backfill foundations is provided. The structure is arranged in layers from top to bottom. Through the synergistic effect of multi-layer filtration and drainage, it can effectively collect and remove groundwater in the backfill foundation, preventing softening or settlement caused by water accumulation inside the foundation.

[0020] A geogrid 1 is laid on the top layer. It has high tensile strength, can distribute the load from the upper fill soil, improve the overall structural stability, and prevent the lower filter material from deforming under pressure. The geogrid 1 is in close contact with the upper filter layer 2, which is constructed using ceramsite filter material with a particle size of 5-10mm. Ceramsite filter material has a rough surface and numerous micropores, possessing excellent adsorption properties, effectively intercepting fine silt and other suspended solids, and initially purifying the infiltrated water flow.

[0021] Please refer to Figure 1 , 2Below the upper filter layer 2, a central water-guiding layer is provided. This layer consists of multiple parallel water-filtering pipes 3, including an outer pipe 32. The outer pipe 32 is wrapped with a permeable geotextile 31, which can further prevent soil particles from entering the pipe. The outer pipe 32 has multiple evenly spaced openings a 33 on its wall, and a honeycomb-structured PVC permeable pipe 34 is nested inside. The PVC permeable pipe 34 also has dense openings b on its wall. The honeycomb design increases the water-passing surface area and improves the water intake efficiency per unit area.

[0022] The PVC permeable pipe 34 is filled with an elastic sponge 35. Its function is to absorb even smaller impurities when water carrying micro-particles enters through the openings, and release some of the retained substances through its own elasticity when the water flow speed changes, thereby dynamically adjusting the filtration accuracy and effectively reducing the risk of clogging.

[0023] Please refer to Figure 1 , 2 Below the central water-conducting layer is the fill layer 4, which uses well-graded crushed stone or gravel for structural support and load transfer. The bottom of the fill layer 4 is equipped with a drainage tunnel structure, including the main concrete diversion channel 6 located in the middle and the side concrete diversion channels 5 distributed on both sides. The bottom surfaces of the main concrete diversion channel 6 and the side concrete diversion channels 5 are both designed in an arc shape. This shape conforms to the fluid dynamics characteristics, which is conducive to the smooth flow of collected water to the designated discharge point and reduces the possibility of siltation.

[0024] The bottom layer of the entire blind drain structure is a filter layer 7, which is usually composed of graded sand and gravel. Following the principle of fine sand at the top and coarse sand at the bottom, it can prevent the soil particles from being lost with the water flow, ensuring soil stability, and also ensure that groundwater can smoothly infiltrate into the drainage system.

[0025] Working principle: When groundwater infiltrates into the backfill foundation, it first passes through the geogrid 1 for initial protection, and then enters the upper filter layer 2. The ceramsite filter media removes most of the suspended solids in the water, and the cleaner water continues to infiltrate to the middle drainage layer. It enters the filter pipe fitting 3 through the openings a 33 of the permeable geotextile 31 and the outer pipe 32. Some finer particles are captured by the PVC permeable pipe 34 and the elastic sponge 35 inside. The water collected in the filter pipe fitting 3 is discharged downward to the backfill layer 4 under the action of gravity, and finally flows into the bottom main concrete diversion channel 6 and the side concrete diversion channel 5. The diversion channel at the bottom of the arc effectively collects and quickly leads the water flow to the outside of the system, while the bottom reverse filter layer 7 ensures that the foundation soil does not experience piping failure. The extended reverse filter layer 7 forms a complete protective shell, ensuring the long-term unobstructed drainage channel and the structural safety of the foundation soil.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blind drain structure for a deep backfill foundation, characterized in that, include: Upper filter layer (2), on which geogrid (1) is laid; The middle water guiding layer is located below the upper filter layer (2) and includes a plurality of flatly arranged filter pipes (3). Filling layer (4), which is laid below the central water-conducting layer; A drainage tunnel structure, located below the fill layer (4), is used to discharge water flow; The reverse filter layer (7) is located at the bottom layer and extends along both sides to the bottom of the upper filter layer (2).

2. The blind drain structure for deep fill foundations according to claim 1, characterized in that: The water filter pipe (3) includes an outer pipe (32), and a PVC permeable pipe (34) is provided inside the outer pipe (32). The PVC permeable pipe (34) has a honeycomb structure, and an elastic sponge (35) is provided inside each PVC permeable pipe (34).

3. The blind drain structure for deep fill foundations according to claim 2, characterized in that: The outer side of the outer tube (32) is provided with a permeable geotextile (31).

4. The blind drain structure for deep backfill foundation according to claim 3, characterized in that: The outer tube (32) has several openings a (33) on its outer side, and the PVC permeable pipe (34) has several openings b on its outer side.

5. The blind drain structure for a deep fill foundation according to any one of claims 1-4, characterized in that: The upper filter layer (2) is made of ceramic granules, and the particle size of the ceramic granules is 5-10 mm.

6. The blind drain structure for deep fill foundation according to claim 5, characterized in that: The drainage tunnel structure includes a main concrete diversion channel (6) set below the fill layer (4), and side concrete diversion channels (5) are respectively set on both sides of the main concrete diversion channel (6). The bottom surfaces of the main concrete diversion channel (6) and the side concrete diversion channels (5) are both arc-shaped.

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