Basement deep foundation construction drainage well structure

Abstract

The utility model relates to the field of building construction, and provides a drainage well structure for basement deep foundation construction. Comprising a foundation pit, a water collecting groove is dug in the inner bottom face of the foundation pit in the length direction of the foundation pit, a reinforcement cage is placed in the water collecting groove, a prefabricated cover plate is laid on the bottom face of the foundation pit, a through hole is formed in the center of the prefabricated cover plate, a round pipe is installed in the through hole, and the bottom of the round pipe is inserted into the reinforcement cage; a water layer of a deep foundation is drained in the mode that a drainage groove is excavated under a basement foundation pit, a reinforcement cage covered with geotechnical cloth is pre-buried in the drainage groove, water in a soil layer can continuously seep out in the construction process and enters the drainage groove to be collected, and the ground of the foundation pit and the ground of the basement can be constructed synchronously in the drainage process; water in the soil layer does not need to be drained, and the construction period can be effectively shortened.

Description

Technical Field

[0001] This utility model relates to the field of building construction, specifically to the structure of drainage wells for deep foundation construction of basements. Background Technology

[0002] The removal of moisture from the soil is a common problem during foundation construction. For shallow foundations on the ground, open ditches and sump trenches are often used to collect and remove moisture from the soil. However, for deep foundations located in basements, due to the higher moisture content in the soil and the relatively large excavation width, lightweight wellpoint and manhole dewatering measures are often used, and multi-stage dewatering may also be employed. Even so, there are still areas where dewatering is ineffective, requiring additional wellpoint dewatering, which increases costs. The drainage process for deep foundations generally takes more than three weeks, affecting the construction schedule. Therefore, alternative dewatering measures are needed to achieve better dewatering results. Summary of the Invention

[0003] In order to meet the requirements for removing soil moisture during the construction of deep foundations in basements, this utility model provides a drainage well structure for deep foundation construction in basements.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] The basement deep foundation construction drainage well structure includes a foundation pit. The two side walls of the foundation pit are sloping in the width direction, forming a trench with a top opening wider than the bottom. A water collection trough is excavated along the length of the foundation pit on its inner bottom surface. The two side walls of the water collection trough are also sloping in the width direction. A reinforcing cage is placed inside the water collection trough, extending along its length. The outside of the reinforcing cage is wrapped with geotextile. The gap between the reinforcing cage and the water collection trough is filled with pebbles or crushed stones. A precast cover plate is laid on the bottom surface of the foundation pit. A cover plate covers the top opening of the water collection trough. The center of the precast slab has a through hole, and a round pipe is installed in the through hole. The bottom of the round pipe is inserted into the reinforcing cage. The lower end of the round pipe is fixed to the precast cover plate by angle steel. The upper end of the round pipe extends out into the foundation pit and is filled with concrete to form the foundation slab of the basement. A water collection well is formed in the center of the foundation pit. The top surface of the water collection well is flush with the foundation slab. The top of the round pipe is located in the water collection well. The bottom of the water collection well is connected to a drainage pipe, which is connected to the open ditch of the basement.

[0006] Furthermore, the slope and bottom of the foundation pit are provided with a concrete cushion layer and a waterproof layer.

[0007] Furthermore, the circular tube is a metal tube, and the outer wall of the circular tube contains multiple layers of connecting steel bars from top to bottom, with each layer of connecting steel bars distributed circumferentially along the outer wall of the circular tube.

[0008] Furthermore, the connecting steel bar is an L-shaped bent steel bar, and the connecting steel bar is connected with the steel bar in the foundation pit to form an integral whole.

[0009] Furthermore, an inner steel pipe is installed at the upper end of the circular tube, and a counterweight is welded to the top of the inner steel pipe.

[0010] Furthermore, a ring of drainage holes is provided at the position corresponding to the bottom of the foundation pit on the circular pipe.

[0011] Furthermore, multiple circular pipes are arranged at equal intervals along the steel cage.

[0012] Furthermore, a water pump is placed inside the steel cage, or a water pumping pipe is connected to it.

[0013] After adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0014] The water layer of the deep foundation is drained by excavating a drainage trench directly below the basement pit. A steel cage covered with geotextile is pre-embedded in the drainage trench. Water in the soil layer will continuously seep out and enter the drainage trench for collection during construction. The foundation pit and the basement floor can be constructed simultaneously during the drainage process, without waiting for the water in the soil layer to be completely drained, which can effectively save construction time. The water in the drainage trench can be discharged by pumps or drainage pipes. Three weeks after drainage, concrete is injected into the drainage trench through a pre-set circular pipe and compacted by vibration with an inserted steel pipe. The drainage trench is then sealed to complete the construction, ultimately forming a basement foundation with a sump well to ensure the dewatering effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure after construction is completed.

[0017] In the diagram: 1. Excavation pit; 2. Water collection trough; 3. Reinforcing cage; 4. Geotextile; 5. Crushed stone; 6. Concrete layer; 7. Waterproof layer; 8. Precast cover plate; 9. Circular pipe; 10. Drainage hole; 11. Connecting reinforcing bar; 12. Water collection well; 13. Drainage pipe; 14. Inserted steel pipe; 15. Counterweight block. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0019] like Figure 1-2As shown, the drainage well structure for deep foundation construction in the basement includes a pit 1, which is shaped like an inverted frustum. The two side walls along the width direction of the pit are sloped. The pit 1 is a trench with a top opening wider than its bottom. A collection trough 2, also shaped like an inverted frustum, is excavated along the length of the pit on the inner bottom surface of the pit, with sloped side walls along its width direction. A reinforcing cage 3 is placed inside the collection trough 2, extending along its length. Geotextile 4 is wrapped around the outside of the reinforcing cage 3 to prevent mud and sand from entering. The gap between the reinforcing cage 3 and the slope of the collection trough is filled with pebbles or gravel 5. Water seeping from the soil is collected in the collection trough 2 and filtered through the gravel 5 before entering the reinforcing cage 3. To prevent water seepage into the pit 1, a concrete layer 6 is first applied to the bottom and slope of the pit 1. A waterproof layer 7 is then added to the outside of the concrete layer 6, allowing water from the soil inside the pit to enter and be collected in the collection trough 2.

[0020] A precast cover plate 8 is laid on the top opening of the water collection trough 2. The precast cover plate 8 is supported on the bottom surface of the foundation pit 1. The center of the precast cover plate 8 has a through hole, and a circular pipe 9 is installed in the through hole. The circular pipe 9 is supported on the precast cover plate 8 by a limiting angle steel or limiting ring at the bottom. A ring of drainage holes 10 is machined on the circular pipe 9. The drainage holes 10 are flush with the bottom surface of the foundation pit 1 to facilitate the drainage of a small amount of seepage water in the foundation pit 1 into the water collection trough 2. The circular pipe 9 can be used to insert a drainage pipe into the drainage trough 2 after the foundation pit 1 is poured, and use a water pump to drain the water in the drainage trough 2; it can also be used to inject concrete into the reinforcing cage 3 after drainage is completed, and finally fill the drainage trough 2.

[0021] The circular pipe 9 is a metal pipe, and its outer wall contains multiple layers of connecting steel bars 11 from top to bottom. Each layer of connecting steel bars 11 is distributed circumferentially along the outer wall of the circular pipe 9. The connecting steel bars 11 are L-shaped bent steel bars, which are connected to the structural steel bars in the foundation pit to form a whole. The foundation pit is filled with concrete to form the foundation slab of the basement, and a recessed sump 12 is formed in the center of the foundation pit. The top surface of the sump 12 is flush with the foundation slab, and the top of the circular pipe 9 is located in the sump. The bottom of the sump 12 is connected to a drainage pipe 13, which is connected to the open ditch of the basement for draining the water accumulated in the sump.

[0022] After three weeks of foundation construction, the water in the soil layer was basically drained. In order to ensure the stability of the foundation and prevent collapse, concrete was injected into the reinforcing cage through a circular pipe. During the injection process, an inner steel pipe 14 was inserted into the upper end of the circular pipe. A counterweight 15 was welded to the top of the inner steel pipe 14. The counterweight 15 was used to vibrate and compact the injected concrete. After the injection was completed, the part of the circular pipe 9 that was exposed in the water collection well was cut off and the pipe opening was sealed to complete the construction.

Claims

1. A structure of a deep foundation construction drainage well of a basement, characterized by, The application relates to a foundation pit, the two side walls of the foundation pit in the width direction are slope surfaces, a pit groove with a top opening wider than a bottom is formed, a water collecting groove is dug on the inner bottom of the foundation pit along the length direction of the foundation pit, the two side walls of the water collecting groove in the width direction are slope surfaces, a steel reinforcement cage is placed in the water collecting groove, the steel reinforcement cage extends along the length direction of the water collecting groove, the outer side of the steel reinforcement cage is wrapped with geotextile, pebbles or stone blocks are filled in the gap between the steel reinforcement cage and the water collecting groove, a prefabricated cover plate is laid on the bottom of the foundation pit, the prefabricated cover plate covers the top opening of the water collecting groove, a through hole is arranged in the center of the prefabricated cover plate, a circular pipe is arranged in the through hole, the bottom of the circular pipe is inserted into the steel reinforcement cage, the lower end of the circular pipe is fixed with the prefabricated cover plate through an angle steel, the upper end of the circular pipe extends out of the foundation pit to fill concrete to form a foundation bottom plate of a basement, a water collecting well is formed in the center of the foundation pit, the top surface of the water collecting well is flush with the foundation bottom plate, the top of the circular pipe is located in the water collecting well, a drain pipe is connected to the bottom of the water collecting well, and the drain pipe is communicated with a open ditch of the basement.

2. The basement deep foundation construction drainage well structure according to claim 1, characterized by, The slope surface of the foundation pit and the bottom of the foundation pit are provided with a concrete cushion layer and a waterproof layer.

3. The basement deep foundation construction drain well structure according to claim 1, characterized by, The circular pipe is a metal pipe, and the outer wall of the circular pipe contains a plurality of layers of connecting steels from top to bottom.

4. The basement deep foundation construction drainage well structure according to claim 3, characterized by, The connecting steel is an L-shaped bent steel, and the connecting steel is connected with the steel in the foundation pit to form an integral whole.

5. The basement deep foundation construction drain well structure according to claim 1, characterized by, The upper end of the circular pipe is provided with an inserted steel pipe, and a heavy block is welded to the top of the inserted steel pipe.

6. The basement deep foundation construction drain well structure according to claim 1, characterized by, The circular pipe is provided with a circle of drain holes at the position corresponding to the bottom of the foundation pit.

7. The basement deep foundation construction drain well structure according to claim 1, characterized by, A plurality of circular pipes are arranged at equal intervals along the steel reinforcement cage.

8. The basement deep foundation construction drain well structure according to claim 1, characterized by, A water pump is arranged in the steel reinforcement cage, or a water suction pipe is connected.

Images