A foundation pit support structure

Abstract

This application discloses a foundation pit support structure, relating to the technical field of foundation pit support. The structure comprises a steel sheet pile and a drive mechanism. An eccentric wheel is rotatably connected to one end of the steel sheet pile. The drive mechanism is used to drive the eccentric wheel to rotate. The steel sheet pile is connected to a pile shell, and the eccentric wheel and drive mechanism are both located within the pile shell. This application has the effect of reducing bending of the steel sheet pile when inserted into soil.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit support, and in particular to a foundation pit support structure. Background Art

[0002] Foundation pit support is a measure of support, reinforcement and protection of the side walls of the foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit.

[0003] Steel sheet piles are a commonly used support method for foundation pit support. Steel sheet piles are inserted into the soil by a pile driver. Multiple steel sheet piles inserted into the soil surround the unexcavated foundation pit, and then the foundation pit is excavated. During the excavation process, support rods are used to support the upper part of the steel sheet piles.

[0004] Due to the presence of stones in the foundation soil, during the insertion process of the steel sheet pile, the stones may be in the insertion path of the steel sheet pile, making it difficult to insert the steel sheet pile. At this time, a pile driver is usually used to apply vibration to the steel sheet pile so that the steel sheet pile can crush the stones in the soil or squeeze the stones away, allowing the steel sheet pile to continue to be inserted.

[0005] When a pile driver applies vibration to a steel sheet pile, the pile body bears a large stress. Since the steel sheet pile is long, it is easy for the steel sheet pile to bend when the upper part is subjected to vibration. After the steel sheet pile is bent, the joints of each steel sheet pile are easy to get stuck, making it difficult to pull out the steel sheet pile later. If it is pulled out forcibly, it may cause the steel sheet pile to break. At the same time, after the steel sheet pile is bent and deformed, it is difficult to reuse it directly. Summary of the Invention

[0006] In order to reduce the bending of steel sheet piles when they are inserted into the soil, the present application provides a foundation pit support structure.

[0007] This application provides a foundation pit support structure, which adopts the following technical solutions:

[0008] A foundation pit support structure includes a steel sheet pile and a driving mechanism, wherein one end of the steel sheet pile is rotatably connected to an eccentric wheel, and the driving mechanism is used to drive the eccentric wheel to rotate. The steel sheet pile is connected to a pile shell, and the eccentric wheel and the driving mechanism are both located in the pile shell.

[0009] By adopting the above technical solution, the steel sheet pile is inserted into the soil from the end close to the eccentric wheel. When the steel sheet pile is blocked by stones in the soil and cannot be inserted further, the driving mechanism can drive the eccentric wheel to rotate, causing the eccentric wheel to vibrate, thereby causing the end of the steel sheet pile inserted into the soil to vibrate, thereby shattering the stones or causing them to deviate from the insertion position of the steel sheet pile, so that the steel sheet pile can continue to be inserted into the soil; at the same time, the vibration applied to the upper part of the steel sheet pile is reduced to reduce the bending of the steel sheet pile when inserted into the soil, reduce the jamming at the connection between each steel sheet pile, and facilitate the removal of the steel sheet pile after use; the pile shell can protect the eccentric wheel, reduce the interference of the soil on the eccentric wheel, and enable the eccentric wheel to rotate and generate vibration; at the same time, the pile shell can facilitate the insertion of the steel sheet pile into the soil; in addition, the steel sheet pile can enhance the strength of the steel sheet pile and reduce the bending of the steel sheet pile.

[0010] Optionally, the eccentric wheel is fixedly connected to a driven sprocket that rotates coaxially with the eccentric wheel, and the end of the steel sheet pile away from the eccentric wheel is rotatably connected to a drive shaft, both ends of the drive shaft are located outside the pile shell, and the driving mechanism includes a driving sprocket and a chain, the driving sprocket is in the pile shell and can rotate with the driving shaft, and the chain is annular and engages with the driving sprocket and the driven sprocket at the same time.

[0011] By adopting the above technical solution, when the steel sheet pile is pressed in, the driving shaft is driven by the pile driver to rotate, so that the active sprocket rotates, and the active sprocket drives the driven sprocket to rotate through the chain, thereby driving the eccentric wheel to rotate, so that the eccentric wheel vibrates, thereby causing the steel sheet pile to vibrate, crushing the stone or causing it to deviate from the insertion position of the steel sheet pile.

[0012] Optionally, both ends of the drive shaft are fixedly connected with drive sections for connecting to a pile driver.

[0013] By adopting the above technical solution, the driving section can be connected to a pile driver, so that the pile driver can drive the driving shaft to rotate, thereby driving the active sprocket to rotate.

[0014] Optionally, a threaded pin is threadedly connected to the driving section.

[0015] By adopting the above technical solution, the threaded pin can enhance the connection strength between the drive section and the pile driver, making the pile driver more stable when driving the drive shaft to rotate; the threaded connection between the threaded pin and the drive section can enhance the strength of the connection between the threaded pin and the drive section, and reduce the occurrence of the threaded pin detaching from the drive section during the rotation of the drive section.

[0016] Optionally, one end of the driving segment away from the driving sprocket is fixedly connected to a threaded segment.

[0017] By adopting the above technical solution, after the foundation pit surrounded by steel sheet piles is excavated, the upper part of the steel sheet piles needs to be supported to reduce the bending of the steel sheet piles when subjected to unilateral soil pressure. The threaded section can be connected to the support rod, thereby supporting the steel sheet piles, making the steel sheet piles less likely to bend, and improving the stability of the foundation pit side walls; at the same time, the threaded section can facilitate the connection between the support rod and the drive shaft, and facilitate the adjustment of the support length of the support rod by rotation between the support rod and the threaded section.

[0018] Optionally, a drainage pipe is fixedly connected to the steel sheet pile, with one end of the drainage pipe close to the eccentric wheel and the other end close to the drive shaft.

[0019] By adopting the above technical solution, a water supply pump pipe can be placed in the drainage pipe to extract water from the drainage pipe, thereby lowering the water level near the steel sheet piles and reducing the infiltration of groundwater into the foundation pit from the side walls of the foundation pit, thereby reducing the amount of water in the foundation pit, reducing the working equipment used for precipitation in the foundation pit, expanding the working surface in the foundation pit, and facilitating construction workers to carry out construction in the foundation pit.

[0020] Optionally, a ventilation pipe parallel to the drainage pipe is connected to the drainage pipe, and a ventilation groove communicating with the ventilation pipe is provided at one end of the drainage pipe close to the eccentric wheel.

[0021] By adopting the above technical solution, the ventilation groove makes the bottom of the drain pipe communicate with the ventilation pipe, so that there is no need to put a pumping pipe into the drain pipe. The drain pipe can be directly connected to the water pump to serve as a pumping pipe, thereby facilitating the extraction of water to lower the water level near the steel sheet piles; at the same time, the ventilation groove can facilitate the control of the amount of water pumped. After the water level is lower than the top of the ventilation groove, the drain pipe will no longer be able to extract groundwater, reducing excessive extraction of groundwater and reducing the impact on foundation stability; in addition, when the steel sheet piles need to be pulled out after use, the ventilation pipe and the drain pipe can be used for grouting, filling the original position of the steel sheet piles with concrete slurry, thereby reducing the foundation settlement caused by the movement of foundation soil to the gaps left by the steel sheet piles after the steel sheet piles are pulled out.

[0022] Optionally, one end of the drain pipe close to the drive shaft is fixedly connected to a connector for connecting to a water pipe of a water supply pump.

[0023] By adopting the above technical solution, the connector can be connected to a water pump, so that the drain pipe serves as a suction pipe of the water pump, which facilitates the extraction of water in the drain pipe, thereby lowering the water level near the steel sheet piles.

[0024] Optionally, the steel sheet pile includes a first flange plate and a second flange plate, the drain pipe and the ventilation pipe are both connected to the first flange plate, and the second flange plate is connected with a connecting portion for plugging the outer walls of the drain pipe and the ventilation pipe.

[0025] By adopting the above technical solution, each steel sheet pile is connected to the connection part through the drainage pipe and the ventilation pipe, so that the connection between each steel sheet pile is more secure; at the same time, the connection length of the connection part and the outer wall of the drainage pipe and the ventilation pipe in the horizontal plane becomes longer, so that the path that water needs to flow through from the steel sheet pile connection becomes longer, thereby slowing down the water penetration at the connection of each steel sheet pile, thereby reducing the penetration of water into the foundation pit.

[0026] Optionally, a soil breaking head is fixedly connected to one end of the steel sheet pile close to the eccentric wheel.

[0027] By adopting the above technical solution, the breaking head can reduce the resistance of the steel sheet pile when it is inserted into the soil, making it easier for the pile foundation to be inserted into the soil; at the same time, the breaking head can easily crush the stone or cause it to deflect, reducing the pressure required when the steel sheet pile encounters the stone when inserted into the soil, and reducing the bending of the steel sheet pile.

[0028] In summary, this application has at least one of the following beneficial effects:

[0029] 1. The steel sheet pile vibrates through the eccentric wheel at the bottom, reducing the vibration of the pile driver on the upper part of the steel sheet pile, which may cause the steel sheet pile to bend;

[0030] 2. Drain pipes and vent pipes can facilitate the extraction of groundwater near the steel sheet piles, lowering the groundwater level near the steel sheet piles and reducing water seepage from the foundation pit walls into the foundation pit;

[0031] 3. Drain pipes and vent pipes can be used for grouting to fill the gaps created by the insertion of steel sheet piles, thereby reducing soil settlement after the steel sheet piles are pulled out;

[0032] 4. The drive shaft can be connected to the support rod for supporting the steel sheet pile through the threaded section, thereby supporting the steel sheet pile, reducing the occurrence of bending of the steel sheet pile, and improving the stability of the foundation pit side wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0034] Figure 2 is a schematic diagram showing the internal structure of an embodiment of the present application;

[0035] Figure 3 yes Figure 2 A partial enlarged schematic diagram of point A in the middle;

[0036] Figure 4 It is a structural schematic diagram showing the ventilation groove in the embodiment of the present application.

[0037] Explanation of the accompanying reference numerals: 1. Steel sheet pile; 11. First flange plate; 12. Second flange plate; 121. Connecting part; 13. Breaking head; 2. Eccentric wheel; 3. Driving mechanism; 31. Driven sprocket; 32. Chain; 33. Driving sprocket; 34. Driving shaft; 341. Driving section; 342. Threaded section; 343. Threaded pin; 4. Drain pipe; 41. Connecting head; 5. Vent pipe; 6. Vent groove; 7. Pile shell. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-4 This application is described in further detail.

[0039] The embodiment of the present application discloses a foundation pit support structure, referring to Figure 1 and Figure 2 , including a steel sheet pile 1 and a driving mechanism 3. One end of the steel sheet pile 1 is rotatably connected to an eccentric wheel 2. The driving mechanism 3 is used to drive the eccentric wheel 2 to rotate. The steel sheet pile 1 is connected to a pile shell 7, and the eccentric wheel 2 is located in the pile shell 7.

[0040] The steel sheet pile 1 is inserted into the soil from the end close to the eccentric wheel 2. When the steel sheet pile 1 is blocked by stones in the soil and cannot be inserted further, the driving mechanism 3 can drive the eccentric wheel 2 to rotate. Since the center of gravity of the eccentric wheel 2 is not on the rotation axis of the eccentric wheel 2, the eccentric wheel 2 will vibrate when it rotates, thereby causing the end of the steel sheet pile 1 inserted into the soil to vibrate, thereby breaking the stones or causing them to deviate from the insertion position of the steel sheet pile 1, so that the steel sheet pile 1 can continue to be inserted into the soil; at the same time, the vibration generated by the eccentric wheel 2 can reduce the need to apply vibration to the upper part of the steel sheet pile 1. The pile shell 7 can protect the eccentric wheel 2, reduce the interference of the soil on the eccentric wheel 2, enable the eccentric wheel 2 to rotate and vibrate, and can facilitate the insertion of the steel sheet pile 1 into the soil. At the same time, the pile shell 7 can enhance the strength of the steel sheet pile 1 and reduce the bending of the steel sheet pile 1.

[0041] Reference Figure 2 and Figure 3The eccentric wheel 2 is fixedly connected to a driven sprocket 31 that rotates coaxially with the eccentric wheel 2. The end of the steel sheet pile 1 away from the eccentric wheel 2 is rotatably connected to a drive shaft 34. Both ends of the drive shaft 34 are located outside the pile shell 7 and are fixedly connected to a drive section 341 for connecting to a pile driver. The steel sheet pile 1 can be lifted by a crane to facilitate the connection of the drive section 341 to the pile driver, or the mechanical arm of the pile driver can be lowered to connect to the drive section 341; a threaded pin 343 is threadedly connected to the drive section 341, and the driving mechanism 3 includes a driving sprocket 33 and a chain 32. The driving sprocket 33 is fixedly connected to the drive shaft 34 in the pile shell 7. The chain 32 is used to connect the driving sprocket 33 and the driven sprocket 31. The chain 32 is annular and meshes with the driving sprocket 33 and the driven sprocket 31 at the same time.

[0042] By adopting the above technical solution, when the steel sheet pile 1 is pressed in, the pile driver is connected to the driving section 341, thereby driving the driving shaft 34 to rotate, causing the driving sprocket 33 to rotate, and the driving sprocket 33 drives the driven sprocket 31 to rotate through the chain 32, thereby driving the eccentric wheel 2 to rotate, causing the eccentric wheel 2 to vibrate, and then causing the steel sheet pile 1 to vibrate, crushing the stone or causing the stone to deviate from the insertion position of the steel sheet pile 1; the threaded pin 343 can enhance the connection strength between the driving section 341 and the pile driver, making the pile driver more stable when driving the driving shaft 34 to rotate; the threaded connection between the threaded pin 343 and the driving section 341 can enhance the strength of the connection between the threaded pin 343 and the driving section 341, and reduce the occurrence of the threaded pin 343 detaching from the driving section 341 during the rotation of the driving section 341.

[0043] Reference Figure 2 and Figure 3 The end of the driving section 341 away from the active sprocket 33 is fixedly connected with a threaded section 342; after the foundation pit surrounded by the steel sheet piles 1 is excavated, the upper part of the steel sheet piles 1 needs to be supported to reduce the bending of the steel sheet piles 1 when subjected to unilateral soil pressure. The threaded section 342 can be connected to the support rod, so that the steel sheet pile 1 is not easy to bend, so as to improve the stability of the foundation pit side wall; at the same time, the threaded section 342 can facilitate the connection between the support rod and the driving shaft 34, and facilitate the adjustment of the support length by rotation between the support rod and the threaded section 342.

[0044] Reference Figure 2 and Figure 3The end of the steel sheet pile 1 close to the eccentric wheel 2 is fixedly connected to a breaking head 13, and the thickness of the breaking head 13 gradually decreases towards the end away from the driving sprocket 33. The maximum thickness of the breaking head 13 is connected to the pile shell 7, and the thickness is the same as the combined thickness of the steel sheet pile 1 and the pile shell 7; the breaking head 13 can reduce the resistance of the steel sheet pile 1 when it is inserted into the soil, making it easier for the pile foundation to be inserted into the soil; at the same time, the breaking head 13 can easily crush or deflect the stone, thereby reducing the pressure required when the steel sheet pile 1 encounters the stone when inserted into the soil, and reducing the bending of the steel sheet pile 1.

[0045] Reference Figure 2 The steel sheet pile 1 includes a first flange plate 11 and a second flange plate 12. A drain pipe 4 is fixedly connected to the first flange plate 11. One end of the drain pipe 4 is close to the eccentric wheel 2, and the other end is close to the drive shaft 34. The drain pipe 4 can be used to insert a water pump pipe to extract water from the drain pipe 4, thereby lowering the water level near the steel sheet pile 1 and reducing the infiltration of groundwater into the foundation pit from the side wall of the foundation pit, thereby reducing the amount of water in the foundation pit, reducing the working equipment used for precipitation in the foundation pit, expanding the working surface in the foundation pit, and facilitating construction workers to carry out construction in the foundation pit.

[0046] Reference Figure 2 and Figure 4 The drainage pipe 4 is fixedly connected to a ventilation pipe 5 which is also connected to the first flange plate 11. The ventilation pipe 5 is parallel to the drainage pipe 4. A ventilation groove 6 is provided at one end of the drainage pipe 4 near the eccentric wheel 2, which is connected to the ventilation pipe 5. The ventilation groove 6 makes the bottom of the drainage pipe 4 communicate with the ventilation pipe 5, so that there is no need to put a pumping pipe into the drainage pipe 4. The drainage pipe 4 can be directly connected to the water pump as a pumping pipe, thereby facilitating the extraction of water to lower the water level near the steel sheet pile 1. At the same time, the ventilation groove 6 can facilitate the control of the water extraction volume. After the water level is lower than the top of the ventilation groove 6, the drainage pipe 4 will no longer be able to extract groundwater, reducing excessive extraction of groundwater and reducing the impact on the stability of the foundation. In addition, when the steel sheet pile 1 needs to be pulled out after use, the ventilation pipe 5 and the drainage pipe 4 can be used for grouting, filling the original position of the steel sheet pile 1 with concrete slurry, thereby reducing the foundation settlement caused by the movement of foundation soil to the gap left by the steel sheet pile 1 after the steel sheet pile 1 is pulled out.

[0047] Reference Figure 2 One end of the drain pipe 4 close to the drive shaft 34 is fixedly connected to a connector 41 for connecting the water pipe of the water pump; the connector 41 can be connected to the water pump, so that the drain pipe 4 serves as the water pump's suction pipe, which is convenient for extracting water in the drain pipe 4, thereby lowering the water level near the steel sheet pile 1.

[0048] Reference Figure 2The second flange plate 12 is connected with a connecting portion 121 for plugging in and out of the water supply and drainage pipe 4 and the ventilation pipe 5; each steel sheet pile 1 is connected to the connecting portion 121 through the drainage pipe 4 and the ventilation pipe 5, so that the connection between each steel sheet pile 1 is more secure; at the same time, the connection length of the connecting portion 121 and the outer wall of the drainage pipe 4 and the ventilation pipe 5 in the horizontal plane becomes longer, so that the path that water needs to flow through from the connection of the steel sheet pile 1 becomes longer, thereby slowing down the water infiltration at the connection of each steel sheet pile 1 and reducing the infiltration of water into the foundation pit.

[0049] The implementation principle of a foundation pit support structure in an embodiment of the present application is as follows: the drive shaft 34 is connected to the pile driver through the drive section 341 and fixed by the threaded pin 343, and the pile driver drives the drive shaft 34 to rotate, so that the active sprocket 33 rotates, thereby driving the eccentric wheel 2 to rotate through the chain 32, causing the eccentric wheel 2 to vibrate, thereby driving the steel sheet pile 1 to vibrate, so that when the steel sheet pile 1 encounters stones in the soil that are difficult to insert, the stones can be shattered or offset by vibration, thereby reducing the vibration that needs to be applied to the upper part of the steel sheet pile 1, thereby reducing the situation where the steel sheet pile 1 is bent due to excessive stress on the pile body due to upper vibration.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A foundation pit support structure, characterized in that: The invention comprises a steel sheet pile (1) and a driving mechanism (3), wherein one end of the steel sheet pile (1) is rotatably connected to an eccentric wheel (2), and the driving mechanism (3) is used to drive the eccentric wheel (2) to rotate. The steel sheet pile (1) is connected to a pile shell (7), and the eccentric wheel (2) and the driving mechanism (3) are both located in the pile shell (7). The end of the steel sheet pile (1) away from the eccentric wheel (2) is rotatably connected to a driving shaft (34). The steel sheet pile (1) is fixedly connected to a drainage pipe (4), and one end of the drainage pipe (4) is close to the eccentric wheel (2), and the other end is close to the driving shaft (34). The drainage pipe (4) is connected to a The drainage pipe (4) is parallel to the ventilation pipe (5), and a ventilation groove (6) communicating with the ventilation pipe (5) is provided at one end of the drainage pipe (4) close to the eccentric wheel (2). The end of the drainage pipe (4) close to the drive shaft (34) is fixedly connected to a connector (41) for connecting a water supply pump water pipe. The steel sheet pile (1) includes a first flange plate (11) and a second flange plate (12). The drainage pipe (4) and the ventilation pipe (5) are both connected to the first flange plate (11), and the second flange plate (12) is connected to a connecting portion (121) for plugging the outer walls of the drainage pipe (4) and the ventilation pipe (5).

2. A foundation pit support structure according to claim 1, characterized in that: The eccentric wheel (2) is fixedly connected to a driven sprocket (31) that rotates coaxially with the eccentric wheel (2). Both ends of the drive shaft (34) are located outside the pile shell (7). The drive mechanism (3) includes a driving sprocket (33) and a chain (32). The driving sprocket (33) is inside the pile shell (7) and can rotate with the drive shaft (34). The chain (32) is annular and meshes with the driving sprocket (33) and the driven sprocket (31) at the same time.

3. A foundation pit support structure according to claim 2, characterized in that: Both ends of the drive shaft (34) are fixedly connected to drive sections (341) for connecting to a pile driver.

4. A foundation pit support structure according to claim 3, characterized in that: A threaded pin rod (343) is threadedly connected to the driving section (341).

5. The foundation pit supporting structure according to claim 3, characterized in that: One end of the driving section (341) away from the driving sprocket (33) is fixedly connected to a threaded section (342).

6. The foundation pit supporting structure according to claim 1, characterized in that: One end of the steel sheet pile (1) close to the eccentric wheel (2) is fixedly connected to a soil breaking head (13).

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