A safety protection device for a deep foundation pit of a construction site

Abstract

This invention relates to the field of safety protection technology for deep foundation pits, specifically to a safety protection device for deep foundation pits in construction sites. The device includes a protective box body, a base plate, a cylindrical section above the base plate, a top plate above the cylindrical section, a first mounting groove in the center of the upper surface of the top plate, and an air intake structure on the top plate. The air intake structure includes a guide sleeve, an air intake pipe inside the guide sleeve, and the air intake pipe is slidably connected to the guide sleeve. A guide head is provided at one end of the air intake pipe extending beyond the upper part of the protective box body, and an extension pipe is provided at the other end of the air intake pipe extending into the protective box body. A first connector is provided at the upper end of the extension pipe, connecting to the lower end of the air intake pipe. This invention incorporates an air intake structure, an extension pipe, and a lifting structure. The lifting structure applies an upward force to the extension pipe, lifting the air intake pipe upwards, thereby ensuring that oxygen can enter the protective box even when the conventional oxygen supply structure fails to supply oxygen normally in an emergency.

Description

Technical Field

[0001] This invention relates to the field of safety protection technology for deep foundation pits, specifically to a safety protection device for deep foundation pits at construction sites. Background Technology

[0002] When constructing large buildings, deep foundation pits are required to ensure the stability of the buildings. Deep foundation pits refer to projects with an excavation depth of more than 5 meters, or projects with particularly complex geological conditions, surrounding environment, and underground pipelines even if the depth does not exceed 5 meters. Because deep foundation pits are deep, safe passages must be provided for workers when working inside them.

[0003] Chinese Patent CN202111630440.1 discloses a safety protection device for deep foundation pits at construction sites. The upper cover plate is equipped with an oxygen supply mechanism, which is connected to an oxygen supply device above the deep foundation pit through an air pipe to supply oxygen to the safety protection device. This oxygen supply method has certain safety hazards. When the top of the safety protection device collapses, the soil presses on the oxygen supply air pipe, which may become blocked or even disconnected from the oxygen supply mechanism, causing the safety protection device to be unable to continue to obtain oxygen after being buried. Summary of the Invention

[0004] To address the aforementioned problems, a safety protection device for deep foundation pits at construction sites is provided. This invention includes an air intake structure, an extension pipe, and a lifting structure. When the top of the protective box is covered, the lifting structure applies an upward force to the extension pipe, lifting the air intake pipe upward. This ensures that even if the conventional oxygen supply structure fails to supply oxygen normally in an emergency, oxygen can still enter the protective box to continuously provide oxygen to the trapped personnel.

[0005] To address the problems in the existing technology, the technical solution adopted by this invention is as follows:

[0006] Preferably, the guide sleeve is provided with an annular sleeve on its outside, the axis of the annular sleeve is collinear with the axis of the guide sleeve, the annular sleeve is provided with a rectangular groove in the middle, the width of the rectangular groove is the same as the outer diameter of the guide sleeve, and the annular sleeve is symmetrically provided with two rotating shafts about its center along its diameter direction. One end of the rotating shaft passes through the annular sleeve and extends into the rectangular groove from the middle of the length direction and is connected to the annular sleeve, and the other end of the rotating shaft is connected to the annular sleeve.

[0007] Preferably, the annular sleeve is provided with a rotating structure on its exterior. The rotating structure includes at least two limiting sliders that are symmetrical about their center along their diameter direction on the exterior of the annular sleeve. One end of the limiting slider is inserted into the annular sleeve. The annular sleeve is also provided with an annular slide rail. The axis of the annular slide rail is collinear with the axis of the annular sleeve. The inner diameter of the annular slide rail is the same as the outer diameter of the annular sleeve. The annular slide rail is fixedly connected to the top plate. An annular limiting groove is opened on the inner side of the annular slide rail. The limiting slider is slidably connected to the limiting groove. At least two second mounting grooves are provided symmetrically about their center along their diameter direction on the outer side of the annular slide rail. Each second mounting groove is provided with a mounting plate.

[0008] Preferably, a partition structure is provided above the rectangular groove to separate the external space of the protective box body from the internal space of the protective box body. The partition structure includes a limiting plate, which is connected to the end of the guide sleeve that extends out of the protective box body. A partition plate is provided on the top of the rectangular groove, which completely covers the rectangular groove. A first pressure spring is provided between the partition plate and the limiting plate. One end of the first pressure spring is connected to the upper surface of the partition plate, and the other end of the first pressure spring is connected to the lower surface of the limiting plate.

[0009] Preferably, a cover is provided at one end of the air intake pipe that extends out of the protective box body. The cover can completely cover the first air intake channel of the air intake pipe, and one side of the cover is hinged to the air intake pipe.

[0010] Preferably, the lifting structure includes an annular plate, with a first fastening structure and a second fastening structure arranged at both ends of the annular plate along its diameter direction. A plurality of connecting rods are arranged in a ring around the center of the lower end of the annular plate. The upper ends of the connecting rods are connected to the annular plate and are perpendicular to each other. A drive disk is arranged at the lower end of the connecting rods. The axis of the drive disk is collinear with the axis of the annular plate. The drive disk is slidably connected to the lower end of the connecting rods. An internal thread is provided on the inner surface of the drive disk, which engages with the thread of the extension tube. At least one drive arm is arranged on the outer side of the drive disk along its diameter direction.

[0011] Preferably, the first fastening structure includes a threaded rod, one end of which is connected to the outer side of the annular plate, and the other end of which is provided with a rotating sleeve. The rotating sleeve is fitted onto the threaded rod, and the threads on the inner side of the rotating sleeve are engaged with the threads of the threaded rod. A second pressure spring is provided between the rotating sleeve and the threaded rod, one end of which abuts against the threaded rod, and the other end of which abuts against the rotating sleeve. An abutting plate is provided at the end of the rotating sleeve away from the threaded rod, and the wall surface of the abutting plate facing the inner wall of the cylinder is patterned. A second connector is provided between the end of the rotating sleeve away from the threaded rod and the abutting plate, one end of which is connected to the end of the rotating sleeve away from the threaded rod, and the other end of which is hinged to the wall surface of the abutting plate facing the rotating sleeve. The second fastening structure is consistent with the structure of the first fastening structure.

[0012] Preferably, at least two strip-shaped limiting blocks are symmetrically arranged on the inner wall of the guide sleeve, at least two first sliding grooves are opened on the outer surface of the air intake pipe, the first sliding grooves are slidably connected to the strip-shaped limiting blocks, at least two first limiting blocks are arranged at the bottom of the air intake pipe, at least two second sliding grooves are opened on the outer surface of the first connector, the second sliding grooves are slidably connected to the first limiting blocks, and at least two third sliding grooves are opened on the outer surface of the extension pipe, the number of third sliding grooves is the same as that of the first sliding grooves, and the third sliding grooves are connected to the first sliding grooves.

[0013] Preferably, the interior of the protective box is also equipped with a manual blower for blowing out high-speed airflow.

[0014] Preferably, the interior of the protective box body is also equipped with a shelf for storing extension tubes, and the shelf is connected to the inner wall of the tube.

[0015] The advantages of this invention compared to the prior art are:

[0016] 1. This invention is equipped with an air intake structure, an extension pipe, and a lifting structure. When the top of the protective box is covered, an extension pipe is passed through the lifting structure and connected to the lower part of the air intake pipe. The lifting structure applies an upward force to the extension pipe, causing the extension pipe to lift the air intake pipe upward. This allows oxygen to enter the protective box and continuously provide oxygen to the trapped personnel when the conventional oxygen supply structure fails to supply oxygen normally in an emergency.

[0017] 2. The present invention is provided with an annular sleeve and a rotating shaft. The guide sleeve is connected to the annular sleeve through the rotating shaft. When the trapped personnel are inside the protective box body, they can rotate the guide sleeve around the rotating shaft in the rectangular groove according to the tilt direction of the protective box body. This allows the air intake pipe to obtain a rotation space of nearly 180 degrees in a plane, thereby enabling the air intake pipe to be adjusted within the plane range after the protective box is tilted.

[0018] 3. The present invention is equipped with a rotating structure. The limiting slider restricts the annular sleeve within the annular slide. Since the annular slide is fixedly connected to the top, the trapped personnel can rotate the annular sleeve to rotate the rectangular groove to the vertical angle at the central axis of its length direction. Then, they can rotate the guide sleeve to find a suitable angle to send the air inlet pipe upward, thereby enabling the air inlet pipe to be adjusted within the three-dimensional space after the protective box is tilted. Attached Figure Description

[0019] Figure 1 This is a front view of a safety protection device used in deep foundation pits at construction sites.

[0020] Figure 2 This is a 3D diagram of a safety protection device used in deep foundation pits at construction sites.

[0021] Figure 3This is a cross-sectional view of a safety protection device used in deep foundation pits at construction sites.

[0022] Figure 4 This is an exploded view of the top plate and air intake structure in a safety protection device for deep foundation pits at construction sites.

[0023] Figure 5 This is a three-dimensional view of a safety protection device for deep foundation pits at construction sites, including a guide sleeve, air inlet pipe, annular sleeve, and rotating shaft.

[0024] Figure 6 This is an exploded view of the annular sleeve and rotating structure in a safety protection device for deep foundation pits at construction sites.

[0025] Figure 7 This is a three-dimensional diagram of the guide sleeve, ring sleeve, and partition structure in a safety protection device for deep foundation pits at construction sites.

[0026] Figure 8 This is a three-dimensional diagram of the air intake pipe and cover plate in a safety protection device for deep foundation pits at construction sites.

[0027] Figure 9 This is a three-dimensional diagram of the extension pipe and lifting structure in a safety protection device for deep foundation pits at construction sites.

[0028] Figure 10 This is a cross-sectional view of the first fastening structure in a safety protection device for deep foundation pits at construction sites.

[0029] Figure 11 This is an exploded view of the guide sleeve, air inlet pipe, and extension pipe of a safety protection device for deep foundation pits at construction sites.

[0030] The numbers on the map are:

[0031] 1-Main body of the protective box;

[0032] 11-Base plate;

[0033] 12-Cylinder section;

[0034] 13-Support column;

[0035] 14-Gate;

[0036] 15-Top plate; 151-First mounting slot;

[0037] 16-Hook base;

[0038] 2-Intake structure;

[0039] 21-Guide sleeve; 211-Strip limit block;

[0040] 22-Intake pipe; 221-First slide groove; 222-First limiting block;

[0041] 23-Guide head;

[0042] 24-Annular sleeve; 241-Rectangular groove;

[0043] 25 - Rotating shaft;

[0044] 26-Rotating structure; 261-Limiting slider; 262-Annular slide rail; 2621-Limiting groove; 2622-Second mounting groove; 263-Mounting plate;

[0045] 27-Partition structure; 271-Limiting plate; 272-Separation plate; 273-First pressure spring;

[0046] 28-Cover plate;

[0047] 3-Extension tube;

[0048] 31-First connector; 311-Second slide;

[0049] 32-Third groove;

[0050] 4- Lifting structure;

[0051] 41-Ring plate;

[0052] 42-First fastening structure; 421-Threaded rod; 422-Rotating sleeve; 423-Second pressure spring; 424-Abutment plate; 425-Second connector;

[0053] 43-Second fastening structure;

[0054] 44 - Connecting rod;

[0055] 45-Drive disk;

[0056] 46 - Drive boom;

[0057] 5- Manual blower;

[0058] 6-Shelf. Implementation

[0059] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0060] Reference Figures 1 to 11As shown: A safety protection device for deep foundation pits at construction sites includes a protective box body 1. The protective box body 1 includes a base plate 11, a cylindrical section 12 is provided above the base plate 11, a plurality of support columns 13 are arranged in a circular array inside the cylindrical section 12, a gate 14 is provided on the outer circumference of the cylindrical section 12, a top plate 15 is provided above the cylindrical section 12, a first mounting groove 151 is opened in the middle of the upper surface of the top plate 15, a plurality of hook seats 16 are arranged in a circular array on the upper surface of the top plate 15, and an air intake structure 2 for providing oxygen is provided on the top plate 15. The air intake structure 2 includes a guide sleeve 21, an air intake pipe 22 is provided inside the guide sleeve 21, and the air intake pipe 2... 2. A first air intake channel is provided along the axial direction. The axis of the air intake pipe 22 is collinear with the axis of the guide sleeve 21, and the air intake pipe 22 is slidably connected to the guide sleeve 21. A guide head 23 is provided at one end of the air intake pipe 22 that extends out of the upper part of the protective box body 1. The guide head 23 is inverted conical. An extension pipe 3 for raising the height of the air intake pipe 22 is provided at one end of the air intake pipe 22 that extends into the interior of the protective box body 1. The outer surface of the extension pipe 3 is provided with threads. A first connector 31 connected to the lower end of the air intake pipe 22 is provided at the upper end of the extension pipe 3. A second air intake channel is provided inside the extension pipe 3 along its axial direction. The first air intake channel and the second air intake channel are connected.

[0061] The protective box body 1 also includes food, water, and a standard oxygen supply system, among other necessary items. When the deep pit wall above the protective box body 1 collapses, a large amount of soil will cover the top of the protective box body 1, compressing the oxygen supply pipes. This will prevent oxygen from being replenished inside the protective box body 1, causing the construction workers trapped inside to suffer from oxygen deprivation while awaiting rescue, threatening their lives. Therefore, an air intake structure 2 is installed at the top of the protective box body 1, with an extension pipe 3 and a lifting structure 4 at the lower end of the air intake structure 2. When the top of the protective box body 1 is covered, the trapped workers... After taking refuge inside the main body 1 of the protective box, the gate 14 is closed. Then, an extension pipe 3 is passed through the lifting structure 4 and connected to the lower part of the air intake pipe 22. The lifting structure 4 applies an upward force to the extension pipe 3, causing the extension pipe 3 to lift the air intake pipe 22 upward. Depending on the depth of the deep pit, multiple extension pipes 3 can be used to push the air intake pipe 22 out of the height covered by the soil. The guide head 23 can prevent soil from entering the air intake pipe 22 when it is moving through the soil. This ensures that oxygen can enter the protective box and continuously provide oxygen to the trapped personnel when the conventional oxygen supply structure cannot supply oxygen normally in case of an emergency.

[0062] Reference Figure 4 and Figure 5As shown: The guide sleeve 21 is provided with an annular sleeve 24 on its outside. The axis of the annular sleeve 24 is collinear with the axis of the guide sleeve 21. The annular sleeve 24 is provided with a rectangular groove 241 in the middle. The width of the rectangular groove 241 is the same as the outer diameter of the guide sleeve 21. The annular sleeve 24 is symmetrically provided with two rotating shafts 25 about its center along its diameter direction. One end of the rotating shaft 25 passes through the annular sleeve 24 and extends into the rectangular groove 241 from the middle of its length direction and is connected to the annular sleeve 24. The other end of the rotating shaft 25 is connected to the annular sleeve 24.

[0063] When the protective box body 1 is impacted by the collapsed soil above, it may tilt. If the direction of the upward movement of the air intake pipe 22 is still perpendicular to the top plate 15, the air intake pipe 22 will contact the deep pit wall after moving upward for a certain distance and will not be able to continue moving upward, resulting in the air intake pipe 22 being unable to provide oxygen. Therefore, an annular sleeve 24 is set outside the guide sleeve 21, and the guide sleeve 21 is connected to the annular sleeve 24 by the rotating shaft 25. The trapped personnel inside the protective box body 1 can rotate the guide sleeve 21 around the rotating shaft 25 in the rectangular groove 241 according to the tilt direction of the protective box body 1, so that the air intake pipe 22 can obtain a rotation space of nearly 180 degrees in a plane, thereby enabling the air intake pipe 22 to be adjusted within the plane range after the protective box tilts.

[0064] Reference Figure 4 and Figure 6 As shown: A rotating structure 26 is provided on the outside of the annular sleeve 24. The rotating structure 26 includes at least two limiting sliders 261 that are symmetrical about their center along their diameter direction on the outside of the annular sleeve 24. One end of the limiting slider 261 is inserted into the annular sleeve 24. An annular slide 262 is also provided on the outside of the annular sleeve 24. The axis of the annular slide 262 is collinear with the axis of the annular sleeve 24. The inner diameter of the annular slide 262 is the same as the outer diameter of the annular sleeve 24. The annular slide 262 is fixedly connected to the top plate 15. An annular limiting groove 2621 is opened on the inner side of the annular slide 262. The limiting slider 261 is slidably connected to the limiting groove 2621. At least two second mounting grooves 2622 are symmetrically provided on the outer side of the annular slide 262 along its diameter direction about its center. Each second mounting groove 2622 is provided with a mounting plate 263.

[0065] The tilt angle of the protective box body 1 may cause the central axis of the rectangular groove 241 in the length direction to be at a horizontal angle. At this time, no matter how the angle of the guide sleeve 21 is adjusted, the air inlet pipe 22 cannot be vertically oriented towards the top of the deep pit. Therefore, a rotating structure 26 is set outside the annular sleeve 24. The limiting slider 261 restricts the annular sleeve 24 within the annular slide 262. Since the annular slide 262 is fixedly connected to the top, the trapped personnel can rotate the annular sleeve 24 to rotate the rectangular groove 241 to a vertical angle along its length direction, and then rotate the guide sleeve 21 to find a suitable angle to send the air inlet pipe 22 upward. This allows the air inlet pipe 22 to be adjusted within the three-dimensional space after the protective box is tilted.

[0066] Reference Figure 1 , Figure 4 , Figure 5 and Figure 7 As shown: A partition structure 27 is provided above the rectangular groove 241 to separate the external space of the protective box body 1 from the internal space of the protective box body 1. The partition structure 27 includes a limiting plate 271, which is connected to the end of the guide sleeve 21 that extends out of the protective box body 1. A partition plate 272 is provided on the top of the rectangular groove 241, which completely covers the rectangular groove 241. A first pressure spring 273 is provided between the partition plate 272 and the limiting plate 271. One end of the first pressure spring 273 is connected to the upper surface of the partition plate 272, and the other end of the first pressure spring 273 is connected to the lower surface of the limiting plate 271.

[0067] The rectangular groove 241 provides rotation space for the guide sleeve 21, but it can also cause soil from the top to pass through the gap between the rectangular groove 241 and the guide sleeve 21 and enter the interior of the protective box body 1, reducing the activity space for trapped personnel. Therefore, a partition plate 272 is installed on the rectangular groove 241. The partition plate 272 moves with the rotation of the guide sleeve 21. The first pressure spring 273 applies a force to the partition plate toward the annular sleeve 24, so that the partition plate 272 is always pressed against the upper surface of the annular sleeve 24, thereby isolating the soil at the top of the protective body and preventing the soil from entering the protective box body 1.

[0068] Reference Figure 1 and Figure 8 As shown: The end of the air intake pipe 22 that extends out of the protective box body 1 is provided with a cover plate 28. The cover plate 28 can completely cover the first air intake channel of the air intake pipe 22. One side of the cover plate 28 is hinged to the air intake pipe 22.

[0069] When the air intake pipe 22 moves toward the top of the deep foundation pit, although the guide head 23 spreads the soil in all directions, some soil will still be squeezed into the upper end of the air intake pipe 22. Therefore, a cover plate 28 is installed on the air intake pipe 22. When the air intake pipe 22 is not used for air conduction, the cover plate 28 completely covers the end of the air intake pipe 22. After the air intake pipe 22 extends out of the soil in the deep foundation pit, gas is blown in from the lower end of the air intake pipe 22 to blow the cover plate 28 upward, thereby protecting the air conduction of the air intake pipe 22.

[0070] Reference Figure 3 and Figure 9 As shown: The lifting structure 4 includes an annular plate 41. The two ends of the annular plate 41 are provided with a first fastening structure 42 and a second fastening structure 43 along its diameter direction. The lower end of the annular plate 41 is arranged with a number of connecting rods 44 in a ring array about its center. The upper end of the connecting rods 44 is connected to the annular plate 41 and the connecting rods 44 are perpendicular to the annular plate 41. The lower end of the connecting rods 44 is provided with a drive disk 45. The axis of the drive disk 45 is collinear with the axis of the annular plate 41. The drive disk 45 is slidably connected to the lower end of the connecting rods 44. The inner surface of the drive disk 45 is provided with an internal thread, which is engaged with the thread of the extension tube 3. The outer side of the drive disk 45 is provided with at least one drive arm 46 along its diameter direction.

[0071] The first fastening structure 42 and the second fastening structure 43 fix the annular plate 41 to the inner wall of the cylindrical part 12. The first connector 31 of the extension tube 3 passes through the drive disc 45 and connects to the lower end of the air intake pipe 22. Then, the drive arm 46 is rotated, which drives the drive disc 45 to rotate. The rotation of the drive disc 45 causes the extension tube 3 to move upward. When the first extension tube 3 is used up, the first connector 31 of the second extension tube 3 is inserted into the lower end of the first extension tube 3. The drive disc 45 is rotated again, and the above steps are repeated, thereby pushing the air intake pipe 22 out of the deep pit.

[0072] Reference Figure 9 and Figure 10As shown: The first fastening structure 42 includes a threaded rod 421. One end of the threaded rod 421 is connected to the outer side of the annular plate 41, and the other end of the threaded rod 421 is provided with a rotating sleeve 422. The rotating sleeve 422 is sleeved on the threaded rod 421, and the thread on the inner side of the rotating sleeve 422 is engaged with the thread on the threaded rod 421. A second pressure spring 423 is provided between the rotating sleeve 422 and the threaded rod 421. One end of the second pressure spring 423 abuts against the threaded rod 421, and the other end of the second pressure spring 423 abuts against the rotating sleeve 422. A retaining plate 424 is provided at the end of the sleeve 422 away from the threaded rod 421. The wall surface of the retaining plate 424 facing the inner wall of the cylinder 12 is patterned. A second connector 425 is provided between the end of the rotating sleeve 422 away from the threaded rod 421 and the retaining plate 424. One end of the second connector 425 is connected to the end of the rotating sleeve 422 away from the threaded rod 421, and the other end of the second connector 425 is hinged to the wall surface of the retaining plate 424 facing the rotating sleeve 422. The second fastening structure 43 has the same structure as the first fastening structure 42.

[0073] When the protective box body 1 tilts, the guide sleeve 21 needs to be rotated, and the annular plate 41 also needs to be changed accordingly. The annular plate 41 and the guide sleeve 21 are made coaxial. Then, the first fastening structure 42 and the second fastening structure 43 are adjusted, and the rotating sleeve 422 is rotated away from the threaded rod 421. The rotating sleeve 422 applies a force toward the inner wall of the cylinder 12 to the abutment plate 424. There is any included angle between the abutment plate 424 and the rotating sleeve 422. The second connector 425 can transmit the force generated by the movement of the rotating sleeve 422 to the abutment plate 424, so that even after the protective box body 1 tilts, the lifting structure 4 can still accurately connect the extension pipe 3 to the air inlet pipe 22.

[0074] Reference Figure 3 and Figure 11 As shown: At least two strip-shaped limiting blocks 211 are symmetrically arranged on the inner wall of the guide sleeve 21; at least two first sliding grooves 221 are opened on the outer surface of the air intake pipe 22, and the first sliding grooves 221 are slidably connected to the strip-shaped limiting blocks 211; at least two first limiting blocks 222 are arranged at the bottom of the air intake pipe 22; at least two second sliding grooves 311 are opened on the outer surface of the first connector 31, and the second sliding grooves 311 are slidably connected to the first limiting blocks 222; at least two third sliding grooves 32 are opened on the outer surface of the extension pipe 3, the number of third sliding grooves 32 is the same as that of the first sliding grooves 221, and the third sliding grooves 32 are connected to the first sliding grooves 221.

[0075] The first connector 31 is inserted into the lower end of the intake pipe 22. The first limiting block 222 at the lower part of the intake pipe 22 is locked in the second slide groove 311, so that the extension pipe 3 rotates synchronously with the intake pipe 22. The strip limiting block 211 is locked in the first slide groove 221. When the lifting structure 4 lifts the extension pipe 3, the extension pipe 3 will receive a rotational force. The strip limiting block 211 restricts the rotation of the intake pipe 22 and makes the intake pipe 22 move in a straight line along the strip limiting block 211. At the same time, the first limiting block 222 at the lower end of the intake pipe 22 restricts the rotation of the extension pipe 3, so that the extension pipe 3 follows the intake pipe 22 in a straight line. When the extension pipe 3 enters the guide sleeve 21, the strip limiting block 211 will be locked in the third slide groove 32, restricting the extension pipe 3 from rotating, thereby preventing the intake pipe 22 and the extension pipe 3 from rotating in the guide sleeve 21, so that the lifting structure 4 can lift the intake pipe 22.

[0076] Reference Figure 3 As shown: The interior of the protective box body 1 is also equipped with a manual blower 5 for blowing out high-speed airflow.

[0077] When the depth of the deep foundation pit is relatively deep, the trapped personnel need to use more extension pipes 3 to push the air intake pipe 22 out of the soil in the deep foundation pit. However, the long total length of the extension pipes 3 makes it impossible for the workers to blow open the cover plate 28 at the end of the air intake by their own airflow. Therefore, a manual blower 5 is set up. The workers align the air outlet of the manual blower 5 with the bottom end of the extension pipe 3 and then squeeze the manual blower 5. The manual blower 5 blows out a high-speed airflow, which opens the cover plate 28 at the end of the air intake pipe 22 through several extension pipes 3, so that the trapped personnel can easily open the cover plate 28 at the end of the air intake pipe 22.

[0078] Reference Figure 2 and Figure 3 As shown: The interior of the protective box body 1 is also equipped with a shelf 6 for storing the extension tube 3, and the shelf 6 is connected to the inner wall of the cylinder 12.

[0079] The depth of the deep foundation pit is much greater than the length of the extension pipe 3. Before entering the deep foundation pit, a sufficient number of extension pipes 3 need to be placed into the main body of the protective box 1. Since the extension pipe 3 has strong rolling properties, a shelf 6 is set up to place the extension pipe 3 in the shelf 6, so as to prevent the extension pipe 3 from rolling randomly when the main body of the protective box 1 is impacted by soil collapse, thus preventing injury to trapped personnel.

[0080] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A safety protection device for deep foundation pits at construction sites, comprising a protective box body (1), the protective box body (1) comprising a bottom plate (11), a cylindrical part (12) disposed above the bottom plate (11), a plurality of support columns (13) arranged in a circular array inside the cylindrical part (12), a gate (14) disposed on the outer circumference surface of the cylindrical part (12), a top plate (15) disposed above the cylindrical part (12), a first mounting groove (151) opened in the middle of the upper surface of the top plate (15), a plurality of hook seats (16) arranged in a circular array on the upper surface of the top plate (15), characterized in that, An air intake structure (2) for providing oxygen is provided on the top plate (15). The air intake structure (2) includes a guide sleeve (21). An air intake pipe (22) is provided inside the guide sleeve (21). The air intake pipe (22) has a first air intake channel along the axial direction. The axis of the air intake pipe (22) is collinear with the axis of the guide sleeve (21), and the air intake pipe (22) is slidably connected to the guide sleeve (21). A guide head (2) is provided at one end of the air intake pipe (22) that extends out of the upper part of the protective box body (1). 3) The guide head (23) is inverted cone shape. One end of the air inlet pipe (22) that extends into the body of the protective box (1) is provided with an extension pipe (3) for raising the height of the air inlet pipe (22). The outer surface of the extension pipe (3) is provided with threads. The upper end of the extension pipe (3) is provided with a first connector (31) that connects to the lower end of the air inlet pipe (22). The interior of the extension pipe (3) is provided with a second air inlet channel along its axial direction. The first air inlet channel and the second air inlet channel are connected. The guide sleeve (21) is provided with an annular sleeve (24) on its outside. The axis of the annular sleeve (24) is collinear with the axis of the guide sleeve (21). The annular sleeve (24) is provided with a rectangular groove (241) in the middle. The width of the rectangular groove (241) is the same as the outer diameter of the guide sleeve (21). The annular sleeve (24) is symmetrically provided with two rotating shafts (25) about its center along its diameter direction. One end of the rotating shaft (25) passes through the annular sleeve (24) and extends into the rectangular groove (241) from the middle of the length direction of the rectangular groove (241) and is connected to the annular sleeve (24). The other end of the rotating shaft (25) is connected to the annular sleeve (24). The annular sleeve (24) is provided with a rotating structure (26) on its outside. The rotating structure (26) includes at least two limiting sliders (261) arranged symmetrically about its center along its diameter direction on the outside of the annular sleeve (24). One end of the limiting slider (261) is inserted into the annular sleeve (24). The annular sleeve (24) is also provided with an annular slide (262) on its outside. The axis of the annular slide (262) is collinear with the axis of the annular sleeve (24). The inner diameter of the annular slide (262) is parallel to the annular sleeve (24). The outer diameter of the sleeve (24) is the same. The annular slide (262) is fixedly connected to the top plate (15). An annular limiting groove (2621) is provided on the inner side of the annular slide (262). The limiting slider (261) is slidably connected to the limiting groove (2621). At least two second mounting grooves (2622) are symmetrically arranged about the center along the diameter direction of the annular slide (262). Each second mounting groove (2622) is provided with a mounting plate (263).

2. A safety protection device for deep foundation pits at construction sites according to claim 1, characterized in that, A partition structure (27) is provided above the rectangular groove (241) to separate the external space of the protective box body (1) from the internal space of the protective box body (1). The partition structure (27) includes a limiting plate (271). The limiting plate (271) is connected to the end of the guide sleeve (21) that extends out of the protective box body (1). A partition plate (272) is provided above the rectangular groove (241). The partition plate (272) completely covers the rectangular groove (241). A first pressure spring (273) is provided between the partition plate (272) and the limiting plate (271). One end of the first pressure spring (273) is connected to the upper surface of the partition plate (272), and the other end of the first pressure spring (273) is connected to the lower surface of the limiting plate (271).

3. A safety protection device for deep foundation pits at construction sites according to claim 1, characterized in that, The end of the air intake pipe (22) extending out of the protective box body (1) is provided with a cover plate (28). The cover plate (28) can completely cover the first air intake channel of the air intake pipe (22). One side of the cover plate (28) is hinged to the air intake pipe (22).

4. A safety protection device for deep foundation pits at construction sites according to claim 1, characterized in that, The lower end of the air intake structure (2) is provided with an extension pipe (3) and a lifting structure (4). The lifting structure (4) includes an annular plate (41). The two ends of the annular plate (41) are provided with a first fastening structure (42) and a second fastening structure (43) along its diameter direction. The lower end of the annular plate (41) is arranged with several connecting rods (44) in a ring array about its center. The upper end of the connecting rod (44) is connected to the annular plate (41), and the connecting rod (44) is perpendicular to the annular plate (41). The lower end of the connecting rod (44) is provided with a drive disk (45). The axis of the drive disk (45) is collinear with the axis of the annular plate (41). The drive disk (45) is slidably connected to the lower end of the connecting rod (44). The inner surface of the drive disk (45) is provided with an internal thread, which is engaged with the thread of the extension pipe (3). The outer side of the drive disk (45) is provided with at least one drive arm (46) along its diameter direction.

5. A safety protection device for deep foundation pits at construction sites according to claim 4, characterized in that, The first fastening structure (42) includes a threaded rod (421), one end of which is connected to the outer side of the annular plate (41), and the other end of which is provided with a rotating sleeve (422). The rotating sleeve (422) is sleeved on the threaded rod (421), and the thread on the inner side of the rotating sleeve (422) is engaged with the thread on the threaded rod (421). A second pressure spring (423) is provided between the rotating sleeve (422) and the threaded rod (421). One end of the second pressure spring (423) abuts against the threaded rod (421), and the other end of the second pressure spring (423) abuts against the rotating sleeve (422). (422) An abutment plate (424) is provided at one end away from the threaded rod (421). The abutment plate (424) has a pattern on the wall surface facing the inner wall of the cylinder (12). A second connector (425) is provided between the end of the rotating sleeve (422) away from the threaded rod (421) and the abutment plate (424). One end of the second connector (425) is connected to the end of the rotating sleeve (422) away from the threaded rod (421). The other end of the second connector (425) is hinged to the wall surface facing the rotating sleeve (422) of the abutment plate (424). The second fastening structure (43) has the same structure as the first fastening structure (42).

6. A safety protection device for deep foundation pits at construction sites according to claim 1, characterized in that, At least two limiting sliders (261) are provided at the bottom of the air intake pipe (22). At least two second sliding grooves (311) are provided on the outer surface of the first connector (31). The second sliding grooves (311) are slidably connected to the limiting sliders (261). At least two third sliding grooves (32) are provided on the outer surface of the extension pipe (3). At least two first sliding grooves (221) are provided on the outer surface of the air intake pipe (22). The number of third sliding grooves (32) is the same as that of first sliding grooves (221), and the third sliding grooves (32) are connected to the first sliding grooves (221).

7. A safety protection device for deep foundation pits at construction sites according to claim 1, characterized in that, The protective box body (1) is also equipped with a manual blower (5) for blowing out high-speed airflow.

8. A safety protection device for deep foundation pits at construction sites according to claim 1, characterized in that, The protective box body (1) is also equipped with a shelf (6) for storing the extension tube (3), and the shelf (6) is connected to the inner wall of the tube (12).

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