A support structure for deep foundation pit construction

Abstract

This invention relates to deep foundation pit support technology, addressing the problems of weak support relying solely on pit baffles, leading to oxygen deficiency for workers at the bottom of the pit and difficulty in removing excavated materials. Specifically, it provides a support structure for deep foundation pit construction, including pit supports. The invention utilizes folding cross plates, adjustable by hydraulic pushers, to gradually unfold and reinforce the inner wall of the deep foundation pit as excavation progresses downwards. Each intersection point on the folding cross plates is reinforced with support rods. A drive gear on the output of a drive motor rotates a transmission gear and a rotating ring, causing a fan to rotate via a drive wheel coaxial with the transmission gear. This transmits air from the ground to the bottom of the deep foundation pit, providing oxygen to workers.

Description

Technical Field

[0001] This invention relates to deep foundation pit support technology, specifically a support structure for deep foundation pit construction. Background Technology

[0002] A foundation pit is a pit excavated at the foundation design location according to the foundation elevation and foundation plane dimensions. For deeper excavations or those near buildings, foundation pit wall support methods, shotcrete wall protection methods, and even large foundation pits can use underground continuous walls and column-type bored pile interlocking methods to prevent the outer soil layer from collapsing.

[0003] In existing technologies, when supporting the inner wall of a deep foundation pit, the support structure only uses pit baffles in four directions to support the inner wall and prevent collapse. The pit baffles themselves are only supported by the upper support frame, which restricts the upper movement of the pit baffles, and the lower part may still collapse, threatening the life safety of construction workers. When construction workers are working at the bottom of the excavated deep foundation pit, the distance between the deep foundation pit and the ground is large, and the size of the deep foundation pit is small, resulting in low air content at the bottom of the deep foundation pit. Construction workers are prone to oxygen deficiency when performing physical labor. In addition, the soil generated during the construction process is far from the ground and is not easy to transport out of the deep foundation pit, which affects the continued operation inside the deep foundation pit.

[0004] To address the aforementioned technical problems, this application proposes a solution. Summary of the Invention

[0005] The purpose of this invention is to adjust the unfolding and folding of the folding cross plate under the push of a hydraulic pusher, so that the pit baffle can gradually unfold and reinforce the inner wall of the deep pit as the excavation continues downward. Each intersection of the folding cross plate can be reinforced with a support rod. The drive gear on the output end of the drive motor rotates the transmission gear and the rotating ring, causing the fan to rotate when it is driven by the drive wheel coaxial with the transmission gear. This transmits air from the ground to the bottom of the deep pit, providing oxygen to the workers at the bottom of the deep pit. This solves the problem that deep pit support is weak when it is only supported by the pit baffle, which makes it easy for workers to suffer from oxygen deficiency at the bottom of the deep pit and makes it difficult to remove the work material. Therefore, this invention proposes a support structure for deep pit construction.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A support structure for deep foundation pit construction includes foundation pit supports, a foundation pit baffle installed between two adjacent foundation pit supports, a plurality of evenly distributed holes on the outer wall of the foundation pit baffle, a fixed slide rail installed at one end of the foundation pit baffle corresponding to the outer wall of the foundation pit support, and a movable double slide rail installed at the other end of the foundation pit baffle corresponding to the outer wall of the foundation pit support. A plurality of evenly distributed hydraulic push rods are slidably connected to the outer wall of the movable double slide rail corresponding to the foundation pit support, and a plurality of rotating seat sliders are slidably connected to the inner side of the movable double slide rail and the fixed slide rail. A folding cross plate is rotatably connected to the end of the rotating seat slider away from the foundation pit support via a rotating shaft.

[0008] In a preferred embodiment of the present invention, a fitting groove is provided at the middle position of the outer side wall of the folded cross plate away from the pit baffle, and a support rod is provided on the outer side wall of the folded cross plate corresponding to the fitting groove position, and a cross sliding sleeve is sleeved on the outer side wall of the support rod.

[0009] In a preferred embodiment of the present invention, a sliding groove is provided on the outer wall of the foundation pit support. A lower screen plate is slidably connected to the outer wall of the foundation pit support at the position corresponding to the sliding groove. A support frame is slidably connected to the outer wall of the foundation pit support above the lower screen plate. An upper screen plate is slidably connected to the outer wall of the foundation pit support above the support frame. A second hole is provided at the middle position of the lower surface of the lower screen plate. A sliding groove is provided at the middle position of the inner side wall of the second hole. A rotating disk is slidably connected to the inner side of the second hole. A limit plate is integrally formed on the outer wall of the rotating disk at the position corresponding to the sliding groove. A third hole is provided on one side of the upper surface of the rotating disk.

[0010] In a preferred embodiment of the present invention, an adjusting screw is rotatably connected to the middle position of the lower surface inside the sliding groove. An adjusting secondary gear plate is installed on the lower surface inside the sliding groove corresponding to the position of the adjusting screw. An adjusting handle is rotatably connected to the outer wall of the foundation pit support corresponding to the position of the adjusting secondary gear plate. An adjusting main gear plate is installed on the outer wall of the adjusting handle corresponding to the position of the adjusting secondary gear plate. A transmission frame is installed at the top of the foundation pit support corresponding to the position of the adjusting screw. A transmission cavity is opened inside the transmission frame. A transmission wheel is rotatably connected inside the transmission cavity corresponding to the position of the adjusting screw. Adjacent transmission wheels are connected by a transmission belt. The inner sides of the transmission belt and the transmission wheels are provided with interlocking tooth grooves.

[0011] In a preferred embodiment of the present invention, a ring slide rail is installed at the middle position of the lower surface of the support frame. A rotating ring is slidably connected inside the ring slide rail. An outer support ring is installed on one side of the lower surface of the rotating ring. An inner connecting ring is slidably connected inside the outer support ring. A plurality of evenly distributed ball grooves are formed on the outer side wall of the inner connecting ring. Balls are slidably connected inside the ball grooves.

[0012] In a preferred embodiment of the present invention, a support plate is integrally formed on one side of the outer wall of the support frame. A slot is formed on the outer wall of the ring slide rail corresponding to the position of the support plate. A transmission gear slot is formed on the outer wall of the rotating ring corresponding to the position of the slot. A drive gear is rotatably connected to the lower surface of the support plate corresponding to the position of the slot. A drive motor is installed on the upper surface of the support plate corresponding to the position of the drive gear. A transmission gear is rotatably connected to the lower surface of the support plate corresponding to the position of the drive gear. A fan is installed at the middle position of the upper surface of the support frame. A drive wheel is installed at the upper end of the shaft connected to the transmission gear. The drive wheel is connected to the rotating shaft of the fan via a transmission belt.

[0013] In a preferred embodiment of the present invention, a hole four is provided on one side of the upper surface of both the upper screen plate and the lower screen plate. A mud discharge pipe is installed on the upper surface of both the upper screen plate and the lower screen plate at the position corresponding to the hole four. A mud discharge box is installed at the upper end of the mud discharge pipe, and a water collection trough is installed at the lower end of the mud discharge pipe. A mud collection trough is integrally formed at the upper end of the water collection trough, and a partition screen plate is installed on the lower surface of the mud collection trough at the position corresponding to the water collection trough.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The folding cross plate is adjusted to unfold and retract under the push of hydraulic push rods, so that the pit baffle can be gradually unfolded as the deep pit is excavated downwards to reinforce the inner wall of the deep pit. Each intersection of the folding cross plate can be reinforced with support rods, and the support rods can automatically adjust their position as the folding cross plate moves. This ensures that all positions of the inner wall of the deep pit are supported, reducing the adverse effects on construction personnel in the event of a collapse. The unfolded folding cross plate also makes it easy for construction personnel to climb out of the deep pit.

[0016] 2. The drive gear on the output of the drive motor rotates, which in turn drives the transmission gear and the rotating ring to rotate. This causes the fan to rotate when it is driven by the drive wheel that is coaxial with the transmission gear. The fan transmits air from the ground to the bottom of the deep foundation pit, providing oxygen to the workers at the bottom of the deep foundation pit. It also helps to disperse and dilute other gases generated by construction errors at the bottom of the deep foundation pit. The mud discharge pipe and the drainage pipe can discharge the mud and sewage generated at the bottom of the deep foundation pit due to construction. The upper screen plate and the lower screen plate can block falling objects to prevent them from injuring the workers at the bottom. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a structural diagram of the main body of the present invention;

[0019] Figure 2 This is a structural diagram of the foundation pit baffle of the present invention;

[0020] Figure 3 This is a structural diagram of the folding cross plate of the present invention;

[0021] Figure 4 This is a structural diagram of the support rod of the present invention;

[0022] Figure 5 This is a structural diagram of the sludge discharge pipe of the present invention;

[0023] Figure 6 This is a structural diagram of the rotating disk of the present invention;

[0024] Figure 7 This is a structural diagram of the drive gear disk of the present invention;

[0025] Figure 8 For the present invention Figure 7 Enlarged structural diagram of part B;

[0026] Figure 9 For the present invention Figure 5 Enlarged structural diagram of part A;

[0027] In the diagram: 1. Pit support; 2. Pit baffle; 31. Movable double slide rail; 32. Folding cross plate; 33. Fixed slide rail; 34. Rotating seat slider; 35. Fitting groove; 36. Hydraulic push rod; 37. Cross sliding sleeve; 38. Support rod; 41. Sliding groove; 42. Adjusting screw; 43. Upper screen plate; 44. Ventilation pipe; 45. Sludge discharge box; 46. Transmission frame; 47. Support frame; 48. Lower screen plate; 49. Water collection trough; 410. Adjusting main gear plate; 411. Adjusting handle; 412. Rotating disc; 413. Sludge collection trough; 414. Support plate; 415. Drive wheel; 416. Drive gear plate; 417. Transmission gear; 418. Rotating ring; 419. Ring slide rail; 420. Fan; 421. Outer support ring; 422. Inner connecting ring; 423. Sludge discharge pipe. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1:

[0030] Please see Figure 1-4As shown, a support structure for deep foundation pit construction includes foundation pit supports 1. A foundation pit baffle 2 is installed at the midpoint between two adjacent foundation pit supports 1. The outer wall of the foundation pit baffle 2 has several evenly distributed holes. A fixed slide rail 33 is installed at one end of the foundation pit baffle 2 corresponding to the outer wall of the foundation pit support 1. A movable double slide rail 31 is installed at the other end of the foundation pit baffle 2 corresponding to the outer wall of the foundation pit support 1. Folding baffles are installed on both sides of the outer wall of the movable double slide rail 31 and the fixed slide rail 33 corresponding to the rotating seat slider 34. Several evenly distributed hydraulic push rods 36 are slidably connected to the outer wall of the movable double slide rail 31 corresponding to the foundation pit support 1. The several hydraulic push rods 36 are all connected to the same hydraulic box. The lengths of each hydraulic push rod 36 can be synchronously adjusted by adjusting the hydraulic tank. Several rotating seat sliders 34 are slidably connected to the inner side of the movable double slide rail 31 and the fixed slide rail 33. The slider end of the rotating seat slider 34 slides inside the movable double slide rail 31 or the fixed slide rail 33. The rotating seat end of the rotating seat slider 34 is rotatably connected to the folding cross plate 32. The end of the rotating seat slider 34 away from the foundation pit support 1 is rotatably connected to the folding cross plate 32 through a rotating shaft. A fitting groove 35 is opened at the middle position of the outer side wall of the folding cross plate 32 away from the foundation pit baffle 2. A support rod 38 is provided at the position of the fitting groove 35 on the outer side wall of the folding cross plate 32. A cross sliding sleeve 37 is sleeved on the outer side wall of the support rod 38.

[0031] In the existing technology, when the support structure supports the inner wall of the deep foundation pit, it only supports the inner wall of the deep foundation pit through the foundation pit baffles 2 in four directions to prevent collapse. The foundation pit baffles 2 themselves are only supported by the upper support frame, which restricts the upper movement of the foundation pit baffles 2, and the lower part may still collapse, threatening the life safety of construction workers.

[0032] After the foundation pit support 1 is installed with the foundation pit baffle 2, it is placed into the deep foundation pit under construction. The foundation pit baffle 2, supported by the four foundation pit support 1s, adheres to the inner wall of the deep foundation pit, preventing its collapse. As the deep foundation pit is excavated downwards, the support structure composed of the foundation pit support 1 and the foundation pit baffle 2 can be lowered as the depth increases. Support columns are installed at the lower end of the foundation pit support 1, allowing the foundation pit baffle 2 to maintain a certain distance from the bottom of the foundation pit, thus reducing the impact of the foundation pit baffle 2 on the downward excavation. Hydraulic thrusters connected to the foundation pit support 1... Under the adjustment of the hydraulic box, rod 36 pushes the movable double slide rail 31 to move its position, causing the folding cross plate 32 to unfold under the push of the hydraulic push rod 36. During rotation, the rotating seat sliders 34 connected to both ends of the folding cross plate 32 slide on the inner sides of the movable double slide rail 31 and the fixed slide rail 33, respectively. The unfolding height of the folding cross plate 32 can be the same as the lowering height of the pit baffle 2, so that while the pit baffle 2 supports the inner wall of the deep pit, the unfolded folding cross plate 32 and the hydraulic push rod 36 installed on the pit baffle 2 can also support the pit baffle 2. For reinforcement, the two ends of the support rod 38 can be installed at the fitting slots 35 on the folding cross plates 32 in four directions. The length of the support rod 38 is equal to the distance between two parallel folding cross plates 32, so that the distance between the folding cross plates 32 can be limited by the support rod 38. When the inner wall of the deep foundation pit collapses, the pushing force of the collapsed inner wall on the foundation pit baffle 2 can be dispersed by the action of the folding cross plates 32 and the support rod 38, thereby reducing the deformation of the foundation pit baffle 2 caused by the pushing force of the collapsed inner wall. When the position of the cross plate 32 changes, the support rods 38 move along with the position of the folded cross plate 32. As the two support rods 38 that are perpendicular to each other move with the folded cross plate 32, the cross sliding sleeve 37 restricts the position and sliding direction of the two support rods 38 during the movement. When the folded cross plate 32 is fully unfolded, it is at the same height as the pit baffle 2, so that when the construction workers working inside the deep pit leave the deep pit, they can climb by stepping on the intersection of the two folded cross plates 32, which makes it easier for the construction workers to leave.

[0033] Example 2:

[0034] Please see Figure 5-9As shown, a sliding groove 41 is provided on the outer wall of the foundation pit support 1. The sliding groove 41 is located on the outer side of the foundation pit support 1 and near the middle position of the two foundation pit baffles 2. A lower screen plate 48 is slidably connected to the outer wall of the foundation pit support 1 at the position corresponding to the sliding groove 41. A support frame 47 is slidably connected above the lower screen plate 48 on the outer wall of the foundation pit support 1. An upper screen plate 43 is slidably connected above the support frame 47 on the outer wall of the foundation pit support 1. Connecting plates are provided at the four corner positions of the upper screen plate 43, the support frame 47, and the lower screen plate 48. The connecting plates are sleeved on the outside of the adjusting screw 42 and are engaged with the threads on the outside of the adjusting screw 42. The vertical position can be adjusted by rotating the adjusting screw 42. A groove is provided at the middle position of the lower surface of the lower screen plate 48. There is a second hole, and a sliding groove is formed in the middle of the inner wall of the second hole. A rotating disk 412 is slidably connected to the inner side of the second hole. The rotating disk 412 is locked in the inner side of the sliding groove by a limiting plate and slides, keeping it from separating from the lower screen plate 48. A limiting plate is integrally formed on the outer side wall of the rotating disk 412 at the position corresponding to the sliding groove. A third hole is formed on one side of the upper surface of the rotating disk 412, and a ventilation pipe 44 is installed at the position of the third hole, so that the rotating disk 412 can rotate with the ventilation pipe 44. An adjusting screw 42 is rotatably connected in the middle of the lower surface of the inner side of the sliding groove 41. An adjusting secondary gear plate is installed in the lower surface of the inner side of the sliding groove 41 at the position corresponding to the adjusting screw 42. An adjusting handle is rotatably connected to the outer side wall of the foundation pit support 1 at the position corresponding to the adjusting secondary gear plate. Handle 411, an adjusting main gear 410 is installed on the outer wall of the adjusting handle 411 at the position corresponding to the adjusting secondary gear 410. The adjusting secondary gear 410 and the adjusting main gear 410 are perpendicular to each other, interlock, and drive each other to rotate. A transmission frame 46 is installed at the top of the foundation pit support 1 at the position corresponding to the adjusting screw 42. The transmission frame 46 has a transmission cavity inside, and a transmission wheel is rotatably connected to each of the adjusting screws 42 inside the transmission cavity. Adjacent transmission wheels are connected by a transmission belt, so that when the four adjusting screws 42 in the foundation pit support 1 rotate, the interaction between the transmission belt and the transmission wheel drives the other three adjusting screws 42 to rotate synchronously. The inner sides of the transmission belt and the transmission wheel are provided with interlocking tooth grooves, which enable the transmission belt and the transmission wheel to rotate synchronously. When the components rotate, slippage is less likely to occur, making the transmission more stable. A ring slide rail 419 is installed at the middle of the lower surface of the support frame 47. A rotating ring 418 is slidably connected inside the ring slide rail 419. An outer support ring 421 is installed on one side of the lower surface of the rotating ring 418. An inner connecting ring 422 is slidably connected inside the outer support ring 421. The inner connecting ring 422 is connected to the outside of the ventilation pipe 44. When the outer support ring 421 rotates with the rotating ring 418, the ventilation pipe 44 can rotate through the inner connecting ring 422, preventing the rotation of the outer support ring 421 from causing the ventilation pipe 44 to twist. Several evenly distributed ball grooves are opened on the outer wall of the inner connecting ring 422, and balls are slidably connected inside the ball grooves.The ball bearings reduce the friction experienced by the inner connecting ring 422 during rotation, preventing excessive friction from hindering the rotation of the ventilation pipe 44 and causing it to twist. Twisted ventilation pipe 44 has a reduced cross-sectional area, affecting ventilation to the area below the deep foundation pit. A support plate 414 is integrally formed on one side of the outer wall of the support frame 47. A slot is formed on the outer wall of the ring slide rail 419 corresponding to the position of the support plate 414. A transmission gear groove is formed on the outer wall of the rotating ring 418 corresponding to the position of the slot. A drive gear 416 is rotatably connected to the lower surface of the support plate 414 corresponding to the position of the slot. One side of the drive gear 416 passes through a slot and engages with the transmission tooth groove on the outer side of the rotating ring 418. When the drive gear 416 rotates under the drive of the drive motor, the rotating ring 418 can be rotated by the engagement of the transmission tooth grooves on the rotating ring 418. A drive motor is installed on the upper surface of the support plate 414 at the position corresponding to the drive gear 416. A transmission gear 417 is rotatably connected to the lower surface of the support plate 414 at the position corresponding to the drive gear 416. The transmission gear 417 engages with the drive gear 416, and the diameter of the transmission gear 417 is smaller than that of the drive gear 416. The diameter of 16 makes the rotational speed of the transmission gear 417 greater than that of the drive gear 416. A fan 420 is installed at the middle position of the upper surface of the support frame 47. A drive wheel 415 is installed at the upper end of the shaft connecting the transmission gear 417. The drive wheel 415 is connected to the rotating shaft of the fan 420 via a transmission belt. Holes 44 are opened on one side of the upper surface of the upper screen plate 43 and the lower screen plate 48. A mud discharge pipe 423 is installed at the position corresponding to hole 44 on the upper surface of the upper screen plate 43 and the lower screen plate 48. A shaftless auger is installed inside the mud discharge pipe 423. Driven by a motor at one end of the sludge discharge box 45, the sludge discharge pipe 423 has the sludge discharge box 45 installed at its upper end and a water collection trough 49 installed at its lower end. Inside the water collection trough 49, at the position corresponding to the shaftless auger, a stirring blade is rotatably connected via a rotating shaft. This prevents sedimentation of the mud and water inside the water collection trough 49, and the mud in the mud and water is discharged through the water flow, preventing sedimentation from affecting the capacity of the water collection trough 49. A mud collection trough 413 is integrally formed at the upper end of the water collection trough 49, and a separating screen plate is installed on the lower surface of the mud collection trough 413 at the position corresponding to the water collection trough 49.

[0035] In the existing technology, when construction workers are working at the bottom of the excavated deep foundation pit, the distance between the deep foundation pit and the ground is large and the size of the deep foundation pit is small, resulting in a low air content at the bottom of the deep foundation pit. Construction workers are prone to oxygen deficiency when performing physical labor. In addition, the soil generated during the construction process is not easy to be transported out of the deep foundation pit because of the distance between the deep foundation pit and the ground, which affects the continued operation inside the deep foundation pit.

[0036] When the drive motor mounted on one side of the support frame 47 is working, it drives the transmission gear 417 and the rotating ring 418 to rotate via the drive gear 416 connected to the output end of the drive motor. During the rotation of the transmission gear 417, the drive wheel 415, which is coaxial with the transmission gear 417, rotates. The drive wheel 415 drives the fan blade shaft inside the fan 420 to rotate via the transmission belt, so that the fan 420 draws air from the outside of the deep pit from one end of the ventilation pipe 44 and discharges it into the deep pit from the other end of the ventilation pipe 44. During the rotation of the drive gear 416, the rotating ring 418 inside the ring slide rail 419 also rotates, so that the outer support ring 421 connected to the rotating ring 418 rotates, causing the lower end of the ventilation pipe 44 to rotate around the ring slide rail 419. During rotation, the air discharged from the ventilation pipe 44 is transported to various locations in the deep foundation pit. The torsional force generated during the rotation of the lower end of the ventilation pipe 44 can be alleviated by the rotation of the inner connecting ring 422 under the action of the balls. When the lower end of the ventilation pipe 44 rotates, it drives the rotating disk 412 to rotate within the lower screen plate 48. The upper screen plate 43, the support frame 47, and the lower screen plate 48 are all connected to the outside of the adjusting screw 42. This allows workers at the bottom of the deep foundation pit to rotate the adjusting handle 411, which in turn drives the adjusting main gear disk 410 connected to the adjusting handle 411 to rotate the adjusting auxiliary gear disk connected to the adjusting screw 42. This causes the upper screen plate 43, the support frame 47, and the lower screen plate 48, which are engaged with the adjusting screw 42 by threads, to rotate. 8. All three components can move up and down simultaneously, allowing the lower end of the ventilation pipe 44 to gradually descend as the construction workers descend further. This introduces fresh air from the ground into the deep foundation pit, providing sufficient oxygen for the workers while also dispersing and diluting other gases generated by construction errors. Rotary doors are installed on the upper surfaces of the upper screen plate 43 and lower screen plate 48 near the mud discharge pipe 423. One-way rotation restriction structures are installed on the lower surfaces of the upper screen plate 43 and lower screen plate 48 corresponding to the rotary door positions, ensuring the rotary doors can only be opened upwards. This allows construction workers at the bottom of the deep foundation pit to move up and down from the rotary door positions without affecting the upper screen plate 43 and lower screen plate 48. The system intercepts falling objects from above, ensuring that they are doubly blocked by the upper screen plate 43 and the lower screen plate 48 when they fall, preventing physical injury to construction workers at the bottom of the deep foundation pit. Soil and sewage generated during construction work at the bottom of the deep foundation pit can be discharged into the sludge collection trough 413. The partition screen plate at the bottom of the sludge collection trough 413 can isolate the soil inside the sludge collection trough 413, while sewage passes through the partition screen plate to the water collection trough 49 below. The sludge inside the sludge collection trough 413 is discharged from the sludge discharge pipe 423 under the action of the shaftless auger. The sewage inside the water collection trough 49 is sucked into the water pump from one end of the drain pipe and discharged from the other end of the drain pipe. The rotating blades of the water pump are connected to the motor output end of one end of the sludge discharge box 45 via a transmission belt.

[0037] In use, after the foundation pit support 1 is installed with the foundation pit baffle 2, it is placed inside the deep foundation pit. The foundation pit baffle 2, supported by the four foundation pit support 1s, adheres to the inner wall of the deep foundation pit, preventing its collapse. As the deep foundation pit is excavated downwards, the support structure composed of the foundation pit support 1 and the foundation pit baffle 2 can descend in position with increasing depth. Support columns are installed at the lower end of the foundation pit support 1, allowing the foundation pit baffle 2 to maintain a certain distance from the bottom of the foundation pit, thus reducing the impact of the foundation pit baffle 2 on the downward excavation of the foundation pit. The connection to the foundation pit support... The hydraulic push rod 36 on the 1st floor, under the adjustment of the hydraulic box, pushes the movable double slide rail 31 to move its position, causing the folding cross plate 32 to unfold under the push of the hydraulic push rod 36. During the rotation, the rotating seat sliders 34 connected to both ends of the folding cross plate 32 slide on the inner sides of the movable double slide rail 31 and the fixed slide rail 33, respectively. The unfolding height of the folding cross plate 32 can be the same as the lowering height of the pit baffle 2, so that while the pit baffle 2 supports the inner wall of the deep pit, the unfolded folding cross plate 32 and the hydraulic push rod 36 installed on the pit baffle 2 can support the pit baffle 2. The support rod 38 is reinforced by its supporting function. Both ends of the support rod 38 can be installed at the fitting slots 35 on the folded cross plates 32 in four directions. The length of the support rod 38 is equal to the distance between two parallel folded cross plates 32, allowing the distance between the folded cross plates 32 to be limited. This ensures that when the inner wall of the deep foundation pit collapses, the pushing force of the collapsed inner wall on the pit baffle 2 can be dispersed by the folded cross plates 32 and the support rod 38, reducing the deformation of the pit baffle 2 caused by the pushing force of the collapsed inner wall. When the unfolded position of the folding cross plate 32 changes, the support rods 38 move along with the position of the folding cross plate 32. When the two support rods 38 that are perpendicular to each other move with the folding cross plate 32, the cross sliding sleeve 37 restricts the position and sliding direction of the two support rods 38 during the movement. When the fully unfolded folding cross plate 32 is at the same height as the pit baffle 2, the construction workers working inside the deep pit can climb by stepping on the intersection of the two folding cross plates 32 when leaving the deep pit, which makes it easier for the construction workers to leave.

[0038] When the drive motor mounted on one side of the support frame 47 is working, it communicates with the output end of the drive motor.The connected drive gear 416 drives the transmission gear 417 and the rotating ring 418 to rotate. During the rotation of the transmission gear 417, the drive wheel 415, which is coaxial with the transmission gear 417, rotates. The drive wheel 415 drives the fan blade shaft inside the fan 420 to rotate via the transmission belt, so that the fan 420 draws air from one end of the ventilation pipe 44 to the outside of the deep foundation pit and discharges it to the inside of the deep foundation pit from the other end of the ventilation pipe 44. During the rotation of the drive gear 416, the rotating ring 418 inside the ring slide rail 419 also rotates, so that the outer support ring 421 connected to the rotating ring 418 drives the lower end of the ventilation pipe 44 to rotate around the ring slide rail 419 when it rotates. During the rotation, the air discharged from the ventilation pipe 44 is distributed to various parts of the deep foundation pit. The conveying is carried out at a certain position. The torsional force generated during the rotation of the lower end of the ventilation pipe 44 can be relieved by the rotation of the inner connecting ring 422 under the action of the ball. When the lower end of the ventilation pipe 44 rotates, it drives the rotating disk 412 to rotate inside the lower screen plate 48. The upper screen plate 43, the support frame 47 and the lower screen plate 48 are all connected to the outside of the adjusting screw 42. This allows the workers working at the bottom of the deep foundation pit to rotate the adjusting handle 411. When the adjusting main gear disk 410 connected to the adjusting handle 411 rotates, it drives the adjusting secondary gear disk connected to the adjusting screw 42 to rotate. This allows the upper screen plate 43, the support frame 47 and the lower screen plate 48, which are engaged with the adjusting screw 42 by threads, to move up and down synchronously. The lower end of the ventilation pipe 44 gradually descends as the construction workers descend further, allowing fresh air from the ground to enter the deep foundation pit. This provides sufficient oxygen for the workers inside and also disperses and dilutes other gases generated due to construction errors. Rotary doors are installed on the upper surfaces of the upper screen plate 43 and lower screen plate 48 near the mud discharge pipe 423. One-way rotation restriction structures are installed on the lower surfaces of the upper screen plate 43 and lower screen plate 48 corresponding to the positions of the rotating doors, ensuring that the rotating doors can only be opened upwards. This allows construction workers at the bottom of the deep foundation pit to move up and down through the rotating doors without affecting the upper screen plate 43 and lower screen plate 48's ability to block falling debris from above. The structure is designed to prevent fall from above from being blocked by both the upper screen plate 43 and the lower screen plate 48, thus preventing injury to construction workers at the bottom of the deep foundation pit. Soil and wastewater generated during construction work at the bottom of the deep foundation pit can be discharged into the sludge collection trough 413. A separating screen plate at the bottom of the sludge collection trough 413 isolates the soil within it, while wastewater passes through the separating screen plate to the lower water collection trough 49. The sludge inside the sludge collection trough 413 is discharged from the sludge discharge pipe 423 by the shaftless auger. Wastewater inside the water collection trough 49 is drawn into a water pump from one end of the drain pipe and discharged from the other end of the drain pipe. The rotating blades of the water pump are connected to the motor output at one end of the sludge discharge box 45 via a transmission belt.

[0039] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A support structure for deep foundation pit construction, comprising foundation pit supports (1), a foundation pit baffle (2) installed at the midpoint between two adjacent foundation pit supports (1), wherein the outer wall of the foundation pit baffle (2) has a plurality of evenly distributed holes, characterized in that, One end of the pit baffle (2) is equipped with a fixed slide rail (33) at the position of the outer side wall of the pit support (1), and the other end of the pit baffle (2) is equipped with a movable double slide rail (31) at the position of the outer side wall of the pit support (1). Several evenly distributed hydraulic push rods (36) are slidably connected to the outer side wall of the movable double slide rail (31) at the position of the pit support (1). Several rotating seat sliders (34) are slidably connected to the inner side of the movable double slide rail (31) and the fixed slide rail (33). The end of the rotating seat slider (34) away from the pit support (1) is rotatably connected to a folding cross plate (32) through a rotating shaft. The outer wall of the foundation pit support (1) is provided with a sliding groove (41), and a lower screen plate (48) is slidably connected to the outer wall of the foundation pit support (1) at the position corresponding to the sliding groove (41). A support frame (47) is slidably connected above the outer wall of the foundation pit support (1) corresponding to the lower screen plate (48). An adjusting screw (42) is rotatably connected to the middle position of the lower inner surface of the sliding groove (41). An adjusting secondary gear plate is installed on the lower inner surface of the sliding groove (41) corresponding to the position of the adjusting screw (42). An adjusting handle (411) is rotatably connected to the outer wall of the foundation pit support (1) corresponding to the position of the adjusting secondary gear plate. An adjusting main gear plate (410) is installed on the outer wall of the adjusting handle (411) corresponding to the position of the adjusting secondary gear plate. A transmission frame (46) is installed at the top of the foundation pit support (1) corresponding to the position of the adjusting screw (42). A transmission cavity is opened inside the transmission frame (46). A transmission wheel is rotatably connected inside the transmission cavity corresponding to the position of the adjusting screw (42). Adjacent transmission wheels are connected by a transmission belt. The transmission belt and the inner side of the transmission wheel are both provided with interlocking tooth grooves. A ring slide rail (419) is installed at the middle position of the lower surface of the support frame (47). A rotating ring (418) is slidably connected inside the ring slide rail (419). An outer support ring (421) is installed on one side of the lower surface of the rotating ring (418). An inner connecting ring (422) is slidably connected inside the outer support ring (421). Several evenly distributed ball grooves are opened on the outer side wall of the inner connecting ring (422). Balls are slidably connected inside the ball grooves. The support frame (47) has an integrally formed support plate (414) on one side of its outer wall. The outer wall of the ring slide rail (419) is provided with a slot corresponding to the position of the support plate (414). The outer wall of the rotating ring (418) is provided with a transmission tooth groove corresponding to the position of the slot. The lower surface of the support plate (414) is rotatably connected to a drive gear (416) corresponding to the position of the slot. The upper surface of the support plate (414) is equipped with a drive motor corresponding to the position of the drive gear (416). The lower surface of the support plate (414) is rotatably connected to a transmission gear (417) corresponding to the position of the drive gear (416). A fan (420) is installed at the middle position of the upper surface of the support frame (47). The upper end of the shaft connected to the transmission gear (417) is equipped with a drive wheel (415). The drive wheel (415) is connected to the rotating shaft of the fan (420) via a transmission belt.

2. The support structure for deep foundation pit construction according to claim 1, characterized in that, A fitting groove (35) is provided at the middle position of the outer side wall of the folded cross plate (32) away from the pit baffle (2). A support rod (38) is provided on the outer side wall of the folded cross plate (32) corresponding to the fitting groove (35). A cross sliding sleeve (37) is fitted on the outer side wall of the support rod (38).

3. The support structure for deep foundation pit construction according to claim 1, characterized in that, The outer wall of the foundation pit support (1) is slidably connected to the upper screen plate (43) above the support frame (47). A hole two is opened at the middle position of the lower surface of the lower screen plate (48). A sliding groove is opened at the middle position of the inner side wall of the hole two. A rotating disk (412) is slidably connected to the inner side of the hole two. A limit plate is integrally formed at the position of the sliding groove on the outer side wall of the rotating disk (412). A hole three is opened on one side of the upper surface of the rotating disk (412).

4. The support structure for deep foundation pit construction according to claim 3, characterized in that, Holes 4 are provided on one side of the upper surface of the upper screen plate (43) and the lower screen plate (48). A mud discharge pipe (423) is installed on the upper surface of the upper screen plate (43) and the lower screen plate (48) at the position corresponding to hole 4. A mud discharge box (45) is installed at the upper end of the mud discharge pipe (423). A water collection trough (49) is installed at the lower end of the mud discharge pipe (423). A mud collection trough (413) is integrally formed at the upper end of the water collection trough (49). A partition screen plate is installed on the lower surface of the mud collection trough (413) at the position corresponding to the position of the water collection trough (49).

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