Construction method of foundation pit excavation and dewatering
By using drainage ditches support structure in foundation pit excavation and precipitation construction, the construction difficulties and safety hazards caused by the traditional open drainage precipitation method under fine sand and silt geological conditions are solved, and the stability and construction safety of drainage ditches are improved.
Patent Information
- Application Number
- CN202411870637.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-04-04
AI Technical Summary
The traditional open drainage precipitation method can easily cause soil flow and pipe surges under geological conditions such as fine sand and silt sand, resulting in drainage ditches collapse and foundation pit slope collapse, which poses construction difficulties and safety hazards.
A drainage ditch support structure is adopted, including two opposite guard plates, and the lower sides of the guard plate are hinged to each other. The hinge design of the guard plate makes the support structure unfold after being inserted into the ground to form a drainage ditch, enhancing the stability of the drainage ditch.
It effectively prevents soil flow and pipe surges, improves the stability of the foundation pit slope, solves construction problems under adverse geological conditions such as fine sand and silt, and ensures the safety and efficiency of construction.
Smart Images
Figure CN119754320A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of foundation pit excavation and dewatering construction, and in particular to a foundation pit excavation and dewatering construction method. Background Art
[0002] As an important part of the downstream connection section of the sluice, the energy dissipation pool has the main function of reducing the energy of the water flow passing through the sluice, ensuring a smooth transition of the water flow, and reducing the erosion of the downstream riverbed. In recent years, with the acceleration of urbanization and the continuous advancement of water conservancy projects, the demand for the construction of energy dissipation pools has been growing, and the corresponding construction technology and equipment have been continuously improved and developed to meet the construction requirements under different geological conditions.
[0003] During the excavation of the foundation pit of the energy dissipation pool, effective dewatering measures are usually required to ensure smooth construction. Traditional dewatering methods mainly include open drainage dewatering, which is to dig drainage ditches and water collection wells in the foundation pit and drain the accumulated water through water pumps. This method is easy to operate and has low cost. It is suitable for coarse-grained soil layers and clay layers with low water seepage.
[0004] However, in actual construction, especially under geological conditions such as fine sand and silt sand, the traditional open drainage method is prone to cause soil flow and pipe bursts, leading to drainage ditch collapse and even collapse of the foundation pit slope adjacent to the drainage ditch, which brings great difficulties and safety hazards to the construction. Summary of the invention
[0005] The present application provides a foundation pit excavation and dewatering construction method, comprising the following steps: A foundation pit excavation and dewatering construction method, including drainage ditch construction and water collection well construction; The drainage ditch is constructed by using a drainage ditch support structure; the drainage ditch support structure includes two oppositely arranged guard plates, the lower sides of the two guard plates are hinged to each other; The two guard plates are pressed together to merge the drainage ditch support structure, and the drainage ditch support structure is inserted as a whole on the ground. The two guard plates are then rotated to separate the two guard plates from each other to complete the deployment of the drainage ditch support structure, and a drainage ditch can be formed between the two guard plates.
[0006] The water collection well construction includes water collection well excavation and water collection box installation; the water collection box is arranged in the water collection well; the water collection box includes a box body, and an interface is arranged on the box body, and the end of the drainage ditch support structure cooperates with the interface; Place the box into the sump and insert one end of the drainage ditch support structure into the interface.
[0007] By adopting the above technical solutions, the design of the drainage ditch support structure can effectively ensure the stability of the soil during the construction process, thereby ensuring the stability of the foundation pit. Specifically, the hinged design of the guard plate enables the support structure to be deployed to form a drainage ditch after being inserted into the ground, which not only simplifies the construction process but also improves construction efficiency. At the same time, the mutual support between the guard plates enhances the overall rigidity of the support structure and further improves the stability of the drainage ditch. In addition, this design is suitable for a variety of soil conditions, especially in fine sand and silt soil layers, and effectively solves the problem that the traditional open drainage method is prone to cause soil instability, drainage ditch collapse, and even foundation pit slope collapse.
[0008] Preferably, the guard plate includes a main body and a plug arranged on the lower side of the main body, the plug is in a pointed cone shape, and there are multiple plugs on the same guard plate, and the multiple plugs are arranged at intervals along the length direction of the main body; the plugs of the two guard plates are cross-arranged and rotatably connected through a connecting shaft.
[0009] By adopting the above technical solution, the multiple conical plugs on the lower side of the guard plate can be effectively inserted into the soil layer to enhance the stability of the drainage ditch support structure. At the same time, the cross-setting of the plugs and the rotating connection design of the connecting shaft enable the guard plate to better adapt to different soil conditions during the deployment process, thereby improving construction efficiency and safety.
[0010] Preferably, when the drainage ditch supporting structure is unfolded, the plugs on the two guard plates are cross-arranged and inserted into the soil layers on both sides of the drainage ditch supporting structure.
[0011] By adopting the above technical solution, the plugs on the guard plate are cross-arranged and inserted into the soil layers on both sides of the drainage ditch support structure, which can effectively enhance the stability of the drainage ditch support structure, prevent the soil layer from displacement or collapse due to water flow impact, and ensure the safety of the construction process. At the same time, the pointed cone shape design of the plug helps to quickly penetrate the soil layer, reducing the difficulty and time of construction.
[0012] Preferably, the drainage ditch support structure is installed by using a pier head, and the pier head has two working ends, one of which is a pointed end and the other is a flat end, which are respectively located at the two ends of the pier head; When the drainage ditch supporting structure is inserted into the ground, the flat head is used to hit the drainage ditch supporting structure downward and wedge it into the ground; when the drainage ditch supporting structure is unfolded, the pointed head is used to insert the pointed head between the two guard plates, and the two guard plates are separated by pushing the pier head downward.
[0013] By adopting the above technical solution, the flat-headed working end can hit the drainage ditch support structure so that it can be quickly wedged into the ground; the pointed working end is inserted between the two guard plates during the unfolding process, and the guard plates are smoothly separated by pushing the pier head downward, forming a stable drainage ditch, which effectively improves construction efficiency.
[0014] Preferably, a reinforcement strip is further provided on the inner side of the guard plate, and the reinforcement strip is vertically arranged; the pointed side wall abuts against the reinforcement strip.
[0015] By adopting the above technical solution, the reinforcement strip is arranged to contact the pier head on the one hand, preventing the pier head from directly acting on the guard plate and causing damage to the guard plate, and on the other hand, it can improve the rigidity and strength of the guard plate. In addition, the reinforcement strip is located on the inner side of the drainage ditch, which can reduce the water flow speed to a certain extent, thereby reducing the scouring effect of the water flow on the soil layer.
[0016] Preferably, the width of the reinforcement strip gradually increases from top to bottom.
[0017] By adopting the above technical solution, when the pier head applies pressure to the guard plate, the greater the resistance to the rotation of the guard plate as the pier head gradually moves downward, the greater the reaction force on the pier head. By increasing the width of the reinforcement strip, the bearing capacity of the guard plate can be effectively guaranteed to avoid damage to the guard plate.
[0018] Preferably, the guard plate further comprises a pressure head arranged on the top of the main body, and the pressure head is arranged in a columnar shape.
[0019] By adopting the above technical solution, the pier head completes the construction of the drainage ditch support structure by impacting the pressure head. During the process, the pressure head can withstand the impact of the pier head, so as to improve the construction efficiency and ensure that the guard plate is not easily damaged.
[0020] Preferably, the drainage ditch supporting structure further comprises a side plate and a bolt, and the side plate is provided with a first plug hole and a second plug hole; When the drainage ditch support structure is inserted into the ground, the first plug hole and the second plug hole are respectively plugged and matched with the pressure heads on the two guard plates in a one-to-one correspondence, so that the two guard plates are kept relatively fixed; when the drainage ditch support structure is unfolded, the side plate is removed from the guard plate; After the drainage ditch support structure is fully unfolded, the first socket is plugged into and matched with the pressure head on one of the guard plates, the second socket is placed on the ground on one side of the drainage ditch support structure, the bolt is passed through the second socket and inserted into the ground to keep the drainage ditch support structure fixed.
[0021] By adopting the above technical solution, the setting of the side plates and bolts makes the drainage ditch support structure more stable and reliable during the insertion and deployment process. Specifically: First, when the drainage ditch support structure is inserted into the ground, the first socket and the second socket are respectively plugged in and matched with the pressure heads on the two guard plates one by one, ensuring that the two guard plates remain relatively fixed, preventing displacement or tilting during the insertion process, and improving the safety and stability of the construction. Second, when the drainage ditch support structure is deployed, the side plate can be easily removed, which is convenient for the operator to perform subsequent deployment actions and improves the construction efficiency. Third, after the drainage ditch support structure is fully deployed, the first socket is plugged in and matched with the pressure head on one of the guard plates, and the second socket is placed on the ground on one side of the drainage ditch support structure. The bolt passes through the second socket and is inserted into the ground, which further enhances the overall stability of the drainage ditch support structure, ensuring that it will not be displaced or collapsed during use, and effectively guarantees the construction quality.
[0022] Preferably, the water collecting box is further provided with a cover plate, and the cover plate is provided with a third plug hole which is plugged and matched with the pressure head.
[0023] By adopting the above technical solution, the setting of the cover plate can prevent debris from entering the water collection tank and affecting the drainage effect. At the same time, the third plug hole on the cover plate is plugged into the pressure head to ensure a stable connection between the drainage ditch support structure and the water collection tank, thereby improving the reliability of the entire system.
[0024] Preferably, a drainage hole is provided on the guard plate, and the drainage hole is in the shape of an elongated strip and is arranged vertically.
[0025] By adopting the above technical solution, drainage holes are opened on the guard plate. The drainage holes are long and vertically arranged, which can promote drainage while ensuring the longitudinal strength of the guard plate, making it less likely to deform when wedged into the ground, so as to facilitate the construction of the drainage ditch support structure.
[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. By adopting the drainage ditch support structure, the plugs between the two guard plates are cross-set and inserted into the soil layer, which effectively prevents soil flow and pipe bursts, improves the stability of the foundation pit slope, and solves the construction problems under unfavorable geological conditions such as fine sand and silt sand; 2. The drainage ditch support structure is used in conjunction with the water collection tank. On the one hand, it can improve the drainage efficiency, and on the other hand, it can prevent the water flow from scouring the soil, thereby avoiding soil instability and ensuring the normal progress of construction; 3. By additionally setting side plates and bolts, the drainage ditch support structure can be further fixed to the ground, improving stability and thus ensuring the normal development of construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1is a cross-sectional view of the drainage ditch support structure when it is combined in the embodiment of the present application; Figure 2 is a cross-sectional view of the drainage ditch support structure when it is unfolded in the embodiment of the present application; Figure 3 It is a schematic diagram of the overall structure of the drainage ditch support structure in the embodiment of the present application; Figure 4 It is a schematic diagram of the connection relationship between the water collecting tank and the drainage ditch support structure.
[0028] Markings in the attached drawings: 1. Drainage ditch support structure; 11. Guard plate; 111. Main body; 112. Plug; 113. Pressure head; 114. Drain hole; 12. Reinforcement strip; 13. Side plate; 14. Bolt; 2. Water collecting tank; 21. Cover plate; 3. Pier head. DETAILED DESCRIPTION
[0029] The following is combined with Figure 1-4 The present invention is described in further detail.
[0030] The foundation pit excavation and dewatering construction method provided in the embodiment of the present application includes two major steps: drainage ditch construction and water collection well construction.
[0031] In the drainage ditch construction steps, the drainage ditch support structure 1 is used, refer to Figure 1 and Figure 2 The drainage ditch supporting structure 1 includes two oppositely arranged guard plates 11, and the lower sides of the two guard plates 11 are hinged to each other.
[0032] During the specific construction, the two guard plates 11 are pressed tightly together to merge the drainage ditch support structure 1, and the drainage ditch support structure 1 is inserted into the ground as a whole. Then, the two guard plates 11 are rotated to separate the two guard plates 11 from each other to complete the deployment of the drainage ditch support structure 1, and a drainage ditch can be formed between the two guard plates 11.
[0033] The construction steps of the water collection well include excavation of the water collection well and installation of the water collection box 2. The water collection box 2 is arranged in the water collection well. The water collection box 2 includes a box body, and an interface is arranged on the box body. The end of the drainage ditch support structure 1 cooperates with the interface; the box body is placed in the water collection well, and one end of the drainage ditch support structure 1 is inserted into the interface.
[0034] In the embodiment of the present application, a plurality of drainage ditch support structures 1 are provided and spliced to each other to change their lengths, and the specific number of use is adjusted according to actual needs. The specific structural composition of a single drainage ditch support structure 1 is described below.
[0035] Specifically, refer to Figure 2 and Figure 3The guard plate 11 includes a main body 111 and a plug 112 arranged at the lower side of the main body 111. The plug 112 is in a pointed cone shape. There are multiple plugs 112 on the same guard plate 11, and the multiple plugs 112 are arranged at intervals along the length direction of the main body 111. The plugs 112 of the two guard plates 11 are cross-arranged and rotatably connected through a connecting shaft. When the drainage ditch support structure 1 is unfolded, the plugs 112 on the two guard plates 11 are cross-arranged and inserted into the soil layers on both sides of the drainage ditch support structure 1. In this way, the stability of the drainage ditch support structure 1 after unfolding can be ensured to prevent the collapse of the soil layer caused by the impact of water flow.
[0036] The installation of the drainage ditch support structure 1 adopts a pier head 3, which has two working ends, one of which is a pointed end and the other is a flat end, which are respectively located at the two ends of the pier head 3. When the drainage ditch support structure 1 is inserted on the ground, the flat end is used to hit the drainage ditch support structure 1 downward and wedge it into the ground; when the drainage ditch support structure 1 is unfolded, the pointed end is used to insert the pointed end between the two guard plates 11, and the two guard plates 11 are separated by pushing the pier head 3 downward. The working end of the pier head 3 can also be designed with a surface with anti-slip texture to increase friction and improve construction efficiency.
[0037] The pier head 3 can be installed on the pneumatic hammer as the hammer head of the pneumatic hammer to improve the construction efficiency.
[0038] The guard plate 11 further comprises a pressure head 113 disposed on the top of the main body 111, and the pressure head 113 is arranged in a columnar shape. When the drainage ditch support structure 1 is installed, the pier head 3 can hit the pressure head 113 to wedge the guard plate 11 into the ground.
[0039] A reinforcing strip 12 is also provided inside the guard plate 11, and the reinforcing strip 12 is provided vertically. When the drainage ditch support structure 1 is unfolded, the pointed side wall abuts against the reinforcing strip 12. The reinforcing strip 12 is provided to contact with the pier head 3 on the one hand, to prevent the pier head 3 from directly acting on the guard plate 11 and causing damage to the guard plate 11, and on the other hand, to improve the rigidity and strength of the guard plate 11.
[0040] In addition, the width of the reinforcing strip 12 gradually increases from top to bottom. When the pier head 3 applies pressure to the guard plate 11, as the pier head 3 gradually moves downward, the greater the resistance to the rotation of the guard plate 11, the greater the reaction force on the pier head 3. By increasing the width of the reinforcing strip 12, the bearing capacity of the guard plate 11 can be effectively guaranteed to avoid damage to the guard plate 11. The width increase portion of the reinforcing strip 12 can be designed in a gradual manner to achieve a smooth transition and reduce stress concentration.
[0041] The drainage ditch support structure 1 also includes a side plate 13 and a bolt 14. The side plate 13 is provided with a first plug hole and a second plug hole. When the drainage ditch support structure 1 is inserted into the ground, the first plug hole and the second plug hole are respectively plugged and matched with the pressure heads 113 on the two guard plates 11 in a one-to-one correspondence, so that the two guard plates 11 remain relatively fixed; when the drainage ditch support structure 1 is unfolded, the side plate 13 is removed from the guard plate 11.
[0042] After the drainage ditch support structure 1 is fully unfolded, the first plug hole is plugged into the pressure head 113 on one of the guard plates 11, the second plug hole is placed on the ground on one side of the drainage ditch support structure 1, and the bolt 14 is passed through the second plug hole and inserted into the ground to keep the drainage ditch support structure 1 fixed. The thickness of the side plate 13 can be adjusted according to actual conditions to ensure sufficient strength and stability.
[0043] The guard plate 11 is provided with a drainage hole 114, which is in the shape of a long strip and arranged vertically. The arrangement of the drainage hole 114 helps to accelerate the drainage of the accumulated water in the drainage ditch and improve the drainage efficiency. The shape of the drainage hole 114 can be designed to be a long strip, a circle or other suitable shapes to adapt to different construction environments and needs.
[0044] Reference Figure 4 The water collecting box 2 is also provided with a cover plate 21, and a third plug hole is provided on the cover plate 21 for plugging and matching with the pressure head 113, so as to achieve relative fixation between the water collecting box 2 and the drainage ditch support structure 1. The shape of the cover plate 21 can be designed to be rectangular, square or other suitable shapes to adapt to different construction sites and requirements. A handle can also be provided on the cover plate 21 to facilitate construction workers to open and close the cover plate 21 and improve construction efficiency.
[0045] The implementation principle of this embodiment is: by adopting a method combining a drainage ditch support structure 1 and a water collecting box 2, the problem of soil erosion caused by the traditional open drainage method under geological conditions such as fine sand and silt sand is effectively solved. The design of the guard plate 11 and the plug 112 of the drainage ditch support structure 1 improves the stability and reliability of the support structure and prevents the collapse of the soil layer caused by the impact of water flow. The setting of the water collecting box 2 further enhances the efficiency and stability of the drainage system, ensures that the accumulated water in the foundation pit can be discharged in time, and guarantees the construction safety and engineering quality. In addition, by reasonably designing the guard plate 11, the plug 112, the pier head 3, the reinforcement strip 12, the pressure head 113, the side plate 13, the bolt 14, the cover plate 21 and the drainage hole 114 and other components, a good coordination and coordinated work between the components are achieved, and the practicality and economy of the entire construction method are improved.
[0046] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A foundation pit excavation and dewatering construction method, characterized in that: Including drainage ditch construction and water collection well construction; The drainage ditch is constructed by using a drainage ditch support structure (1); the drainage ditch support structure (1) comprises two oppositely arranged guard plates (11), the lower sides of the two guard plates (11) being hinged to each other; The two guard plates (11) are pressed tightly together to merge the drainage ditch support structure (1), and the drainage ditch support structure (1) is inserted as a whole on the ground, and then the two guard plates (11) are rotated to separate the two guard plates (11) from each other to complete the deployment of the drainage ditch support structure (1), and a drainage ditch is formed between the two guard plates (11); The water collection well construction includes excavation of the water collection well and installation of a water collection box (2); the water collection box (2) is arranged in the water collection well; the water collection box (2) includes a box body, the box body is provided with an interface, and the end of the drainage ditch support structure (1) cooperates with the interface; Place the box into the water collection well and insert one end of the drainage ditch support structure (1) into the interface.
2. The foundation pit excavation and dewatering construction method according to claim 1, characterized in that: The guard plate (11) comprises a main body (111) and a plug (112) arranged at the lower side of the main body (111); the plug (112) is in a pointed cone shape; a plurality of plugs (112) are provided on the same guard plate (11); the plurality of plugs (112) are arranged at intervals along the length direction of the main body (111); the plugs (112) of two guard plates (11) are arranged crosswise and are rotatably connected via a connecting shaft.
3. The foundation pit excavation and dewatering construction method according to claim 2, characterized in that: When the drainage ditch support structure (1) is unfolded, the plugs (112) on the two guard plates (11) are cross-arranged and inserted into the soil layers on both sides of the drainage ditch support structure (1).
4. The foundation pit excavation and dewatering construction method according to claim 2, characterized in that: The drainage ditch support structure (1) is installed using a pier head (3), wherein the pier head (3) has two working ends, one of which is a pointed end and the other is a flat end, which are respectively located at two ends of the pier head (3); When the drainage ditch support structure (1) is inserted into the ground, the flat head is used to hit the drainage ditch support structure (1) downward and wedge it into the ground; when the drainage ditch support structure (1) is unfolded, the pointed head is used to insert the pointed head between the two guard plates (11), and the two guard plates (11) are separated by pushing the pier head (3) downward.
5. The foundation pit excavation and dewatering construction method according to claim 4, characterized in that: A reinforcing strip (12) is also provided on the inner side of the guard plate (11), and the reinforcing strip (12) is arranged vertically; the pointed side wall abuts against the reinforcing strip (12).
6. The foundation pit excavation and dewatering construction method according to claim 5, characterized in that: The width of the reinforcement strip (12) gradually increases from top to bottom.
7. The foundation pit excavation and dewatering construction method according to claim 2, characterized in that: The guard plate (11) further comprises a pressure head (113) arranged on the top of the main body (111), and the pressure head (113) is arranged in a columnar shape.
8. The foundation pit excavation and dewatering construction method according to claim 7, characterized in that: The drainage ditch support structure (1) further comprises a side plate (13) and a bolt (14); the side plate (13) is provided with a first plug hole and a second plug hole; When the drainage ditch support structure (1) is inserted into the ground, the first plug hole and the second plug hole are respectively plugged into and matched with the pressure heads (113) on the two guard plates (11) in a one-to-one correspondence, so that the two guard plates (11) remain relatively fixed; when the drainage ditch support structure (1) is unfolded, the side plate (13) is removed from the guard plate (11); After the drainage ditch support structure (1) is fully unfolded, the first insertion hole is plugged into and matched with the pressure head (113) on one of the guard plates (11), the second insertion hole is placed on the ground on one side of the drainage ditch support structure (1), and the bolt (14) is passed through the second insertion hole and inserted into the ground, so that the drainage ditch support structure (1) remains fixed.
9. The foundation pit excavation and dewatering construction method according to claim 7, characterized in that: The water collecting box (2) is also provided with a cover plate (21), and the cover plate (21) is provided with a third plug hole for plugging and cooperating with the pressure head (113).
10. The foundation pit excavation and dewatering construction method according to claim 2, characterized in that: The guard plate (11) is provided with a drainage hole (114), and the drainage hole (114) is in the shape of an elongated strip and is arranged vertically.