Protective device for drainage box culvert construction

Abstract

The invention relates to the field of building construction, and discloses a protection device for drainage box culvert construction, which comprises a life jacket, and further comprises a second air bag arranged at the upper part of the life jacket and used for protecting the neck of a user; the inflation assembly is arranged in the life jacket, is connected with the second air bag and is used for inflating the second air bag; the anti-falling assembly is arranged on the life jacket and penetrates through the crotch of the user from the lower portion of the life jacket to be connected with the second air bag, the second air bag can also provide support for the neck, the neck is prevented from being injured, meanwhile, the smoothness of the respiratory tract is kept, and the anti-falling assembly penetrates through the crotch of the user from the lower portion of the life jacket to be connected with the second air bag; and along with the expansion and upward movement of the second air bag, the anti-falling assembly can be tightly bound at the crotch of the user, so that the constructor is prevented from struggling after falling into water and sliding out of the bottom end of the life jacket, and the life jacket is ensured to always provide protection for the user in the falling-into-water process.

Description

Technical Field

[0001] The present invention relates to the technical field of construction, and particularly to a protection device for the construction of drainage culverts. Background Art

[0002] During the construction of drainage culverts, construction workers often face complex and somewhat dangerous working environments. Especially when working in waters or humid areas, there is a risk of workers falling into the water. Once a person falls into the water, without effective protection and rescue measures, the construction worker may suffer serious safety accidents due to drowning, hypothermia, or physical injuries.

[0003] Existing equipment has the following drawbacks: Although existing life jackets can provide buoyancy to the person falling into the water to keep them floating on the water surface to a certain extent, in the special scenario of drainage culvert construction, there are many deficiencies. On the one hand, ordinary life jackets do not pay enough attention to the protection of the user's neck. The neck lacks support and protection, which is likely to cause neck injuries and even affect breathing. On the other hand, traditional life jackets may fall off the user during use, especially when the water flow is rapid or the user's body shakes violently. Once the life jacket falls off, it will lose its due protective effect, seriously threatening the life safety of the user.

[0004] Therefore, the present application now proposes a protection device for the construction of drainage culverts to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a protection device for the construction of drainage culverts to solve the problems that ordinary life jackets do not pay enough attention to the protection of the user's neck, the neck lacks support and protection, which is likely to cause neck injuries and even affect breathing. On the other hand, traditional life jackets may fall off the user during use, especially when the water flow is rapid or the user's body shakes violently. Once the life jacket falls off, it will lose its due protective effect. Moreover, in the construction of drainage culverts, the person falling into the water may experience a rapid drop in body temperature and hypothermia symptoms due to being soaked in water for a long time, and most existing life jackets do not have a heating function and cannot effectively relieve the user's hypothermia problem. At the same time, when the person falling into the water floats face down, the risk of choking on water and drowning will increase, and existing life jackets also lack corresponding devices to ensure that the user floats face up.

[0006] To achieve the above object, the present invention provides the following technical solution: A protection device for the construction of drainage culverts, including a life jacket, further including:

[0007] A second airbag, arranged on the upper part of the life jacket, for protecting the user's neck;

[0008] An inflation assembly, which is arranged inside the life jacket and connected to the second airbag, is used to inflate the second airbag;

[0009] An anti - detachment assembly, which is arranged on the life jacket and passes through the crotch of the user from below the life jacket and is connected to the second airbag, is used to prevent the life jacket from falling off the user.

[0010] Wherein, the protection device further includes:

[0011] An air cylinder, which is arranged on the life jacket;

[0012] A first airbag, which is arranged on the life jacket and located at the chest position of the user, is used to inflate and expand when the air cylinder is opened, so that the user floats face - up on the water surface;

[0013] A fixing strap for fixing the air cylinder is arranged on the life jacket.

[0014] Wherein, the inflation assembly includes:

[0015] A third airbag, which is arranged inside the life jacket and connected to the second airbag through an inflation tube, is used to inflate the second airbag;

[0016] An extrusion member, which is arranged on the life jacket and used to manually inflate the third airbag;

[0017] An installation groove for placing the third airbag is formed on the life jacket.

[0018] Wherein, the third airbag includes:

[0019] An air outlet, which is arranged at the position where the third airbag is connected to the inflation tube;

[0020] An air inlet, which is on one side of the third airbag and used to inflate the inside of the third airbag;

[0021] One - way valves are arranged on both the air outlet and the air inlet.

[0022] Wherein, the extrusion member includes:

[0023] A sealing plate, which is arranged on the life jacket and used to seal the installation groove;

[0024] An extrusion plate, which is arranged on the side of the sealing plate close to the third airbag and abuts against the side of the third airbag away from the inflation tube, is used to extrude the third airbag;

[0025] A pull rod, which is arranged on the side of the sealing plate away from the extrusion plate and passes through the life jacket, is used to drive the extrusion plate to move inside the life jacket;

[0026] A moving groove for the movement of the sealing plate is formed in the life jacket.

[0027] A limiting groove for installing the sealing plate is arranged on the side of the life jacket away from the moving groove of the sealing plate.

[0028] Wherein, the pressing member further includes:

[0029] A pulling block is arranged on the side of the pull rod outside the life jacket, and a magic tape is arranged on the side connected with the life jacket for pulling the pull rod to move inside the life jacket.

[0030] Wherein, the pressing member further includes:

[0031] An elastic member is sleeved on the part of the pull rod between the sealing plate and the moving groove.

[0032] Wherein, the life jacket further includes:

[0033] A fixing buckle is arranged on the life jacket for fixing the life jacket to the user.

[0034] Wherein, the protection device further includes:

[0035] A heating patch is arranged inside the life jacket and presses and generates heat inside the installation groove for heating the user's body.

[0036] Wherein, the anti-detachment component includes:

[0037] A pull rope is arranged at the upper end of the second airbag and moves upward with the expansion of the second airbag;

[0038] A branching section is arranged at the lower end of the pull rope;

[0039] One end of an anti-detachment rope is arranged on the branching section, and the other end is arranged on the fixing buckle. The anti-detachment rope passes through the crotch of the user and is tightened on the crotch of the user under the drive of the pull rope;

[0040] A limiting belt for restricting the pull rope is arranged on the life jacket.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] 1. By providing a protection device, the second airbag can also support the neck, preventing neck injuries and helping to keep the respiratory tract unobstructed. The anti-slip component passes through the user's crotch from below the life jacket and is connected to the second airbag. As the second airbag expands and moves upward, the anti-slip component will tighten around the user's crotch, preventing the construction worker from slipping out from the bottom of the life jacket during struggling after falling into the water, ensuring that the life jacket can always provide protection for the user during the falling process.

[0043] 2. The heating patch of the present invention is provided inside the life jacket and generates heat upon pressing. When the sealing cover is pulled open from the installation groove, the pressing plate squeezes the third airbag. At this time, the heating patch is exposed inside the installation groove. Then, by pressing the heating patch inside the installation groove, the heating patch starts to generate heat, which can provide warmth for the construction worker's body, help maintain the body's core temperature, and prevent hypothermia symptoms caused by low temperature, such as shivering, increased heart rate, and slow reaction, ensuring the health of the user.

[0044] 3. The first airbag of the present invention is provided on the life jacket and located at the user's chest position. When the gas cylinder is opened, the first airbag can inflate and expand. The key function of this design is that it can enable the user's body to automatically adjust to a face-up floating posture after falling into the water. In an emergency situation of falling into the water, floating face-up greatly reduces the risk of the user choking on water and drowning. Because when the face is down, water easily enters the respiratory tract, causing the user to be unable to breathe normally and quickly fall into a dangerous situation. The buoyancy generated after the first airbag is inflated can change the distribution of the user's body center of gravity, making it naturally float on the water surface in a face-up manner, winning more rescue time and survival opportunities for the user, and significantly increasing the survival probability of the person who has fallen into the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the main structure in an embodiment of the present invention;

[0046] Figure 2 It is a schematic diagram of the front view structure in an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of the rear view structure in an embodiment of the present invention;

[0048] Figure 4 It is a schematic diagram of the sectional view structure in an embodiment of the present invention;

[0049] Figure 5 It is a schematic diagram of the top view structure in an embodiment of the present invention;

[0050] Figure 6 It is a schematic diagram of the inflation component structure in an embodiment of the present invention;

[0051] Figure 7Schematic diagram of the elastic member located in the moving groove in an embodiment of the present invention;

[0052] Figure 8 Schematic diagram of the connection structure of the inflation assembly with the second airbag and the anti - detachment assembly in an embodiment of the present invention;

[0053] Figure 9 Schematic diagram of the anti - detachment assembly moving with the second airbag in an embodiment of the present invention;

[0054] Figure 10 Schematic diagram of the pressing plate pressing the third airbag in an embodiment of the present invention.

[0055] In the figure: 1. Life jacket; 101. Installation groove; 102. Moving groove; 103. Limiting groove; 11. Gas cylinder; 111. Fixed belt; 12. First airbag; 13. Fixed buckle; 14. Limiting belt; 2. Second airbag; 3. Anti - detachment assembly; 31. Pulling rope; 32. Branching section; 33. Anti - detachment rope; 4. Inflation assembly; 41. Sealing plate; 411. Pressing plate; 42. Pulling rod; 43. Pulling block; 44. Third airbag; 441. Air outlet; 442. Air inlet; 45. Inflation pipe; 46. Elastic member; 5. Heating patch. Specific embodiments

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0057] Please refer to Figures 1-10 , the present invention provides a technical solution: a protective device for the construction of a drainage culvert, including a life jacket 1, and further including: a second airbag 2, arranged on the upper part of the life jacket 1 for protecting the user's neck; an inflation assembly 4, arranged inside the life jacket 1 and connected to the second airbag 2 for inflating the second airbag 2; an anti - detachment assembly 3, arranged on the life jacket 1 and passing through the user's crotch from below the life jacket 1 and connected to the second airbag 2 for preventing the life jacket 1 from falling off the user's body.

[0058] It should be noted that during work, before construction workers carry out construction operations in the drainage culvert, they correctly wear the life jacket 1 and then start the operation. In case of an accident during the construction operation and the construction worker falls into the water, the life jacket 1 can keep the upper body of the construction worker floating on the water surface. Then the construction worker can manually adjust the inflation component 4 to inflate the second airbag 2. When the second airbag 2 is fully inflated, it forms a circular ring shape, which can wrap the neck of the construction worker to protect the neck. Moreover, during the inflation process of the second airbag 2, it will drive the anti-detachment component 3 to move, so that the anti-detachment component 3 tightens at the crotch of the construction worker, fixing the bottom of the life jacket 1 to the construction worker, and enabling the life jacket 1 to be stably fixed on the construction worker's body. By setting the protection device, the second airbag 2 can also provide support for the neck to avoid neck injuries, and at the same time helps to keep the respiratory tract unobstructed. The anti-detachment component 3 passes through the crotch of the user from below the life jacket 1 and is connected to the second airbag 2. As the second airbag 2 expands and moves upward, the anti-detachment component 3 will tighten at the crotch of the user, preventing the construction worker from slipping out from the bottom end of the life jacket 1 during struggling after falling into the water, ensuring that the life jacket 1 can always provide protection for the user during the process of falling into the water.

[0059] In one embodiment, the protection device further includes: a gas cylinder 11 provided on the life jacket 1; a first airbag 12 provided on the life jacket 1 and located at the chest position of the user, which is used to inflate and expand when the gas cylinder 11 is opened, so that the user floats face up on the water surface; a fixing belt 111 for fixing the gas cylinder 11 is provided on the life jacket 1. The gas cylinder 11 (life jacket inflation carbon dioxide cylinder) is a prior art and will not be elaborated here.

[0060] With this design, referring to Figures 1-3 , the first airbag 12 is provided on the life jacket 1 and located at the chest position of the user. When the gas cylinder 11 is opened, the first airbag 12 can inflate and expand. The key function of this design is that it can enable the user to automatically adjust to a face-up floating posture after falling into the water. In an emergency situation of falling into the water, floating face up greatly reduces the risk of the user choking on water and drowning. Because when the face is down, water easily enters the respiratory tract, causing the user to be unable to breathe normally and quickly fall into a dangerous situation. However, the buoyancy generated after the first airbag 12 is inflated can change the distribution of the user's body center of gravity, enabling the user to naturally float on the water surface in a face-up manner, winning more rescue time and survival opportunities for the user, and significantly increasing the survival probability of the person falling into the water.

[0061] In one embodiment, the inflation component 4 includes: a third airbag 44 provided inside the life jacket 1 and connected to the second airbag 2 through an inflation tube 45, which is used to inflate the second airbag 2; a squeezing member provided on the life jacket 1 for manually inflating the third airbag 44; an installation groove 101 for placing the third airbag 44 is formed on the life jacket 1.

[0062] With such a design, referring to Figures 6-9 , the third airbag 44 is disposed inside the life jacket 1 and is connected to the second airbag 2 through an air charging pipe 45. This design enables the third airbag 44 to specifically inflate the second airbag 2. When it is necessary to protect the user's neck, only by inflating the third airbag 44, the gas will smoothly enter the second airbag 2 through the air charging pipe 45, causing it to expand, thereby providing effective support and protection for the user's neck. This targeted inflation method ensures that the second airbag 2 can play its role in a timely manner when needed, improving the reliability and practicality of the protection device.

[0063] In one embodiment, the third airbag 44 includes: an air outlet 441 disposed at the position where the third airbag 44 is connected to the air charging pipe 45; an air inlet 442 on one side of the third airbag 44 for inflating the interior of the third airbag 44; and one-way valves are provided on both the air outlet 441 and the air inlet 442.

[0064] With such a design, referring to Figure 8 , the air outlet 441 is disposed at the position where the third airbag 44 is connected to the air charging pipe 45, and the air inlet 442 is located on one side of the third airbag 44. This clear division of labor makes the inflation process more accurate and efficient. When the third airbag 44 is squeezed by a squeezing member, the air inlet 442 is sealed under the action of the one-way valve, and the gas can smoothly enter the second airbag 2 through the air outlet 441 and the air charging pipe 45 to inflate the second airbag 2. After the gas inside the third airbag 44 is exhausted, the squeezing member resets, releasing the squeeze on the third airbag 44. At this time, the one-way valve inside the air outlet 441 seals the air outlet 441, and the one-way valve in the air inlet 442 opens, and the gas enters the interior of the third airbag 44 from the air inlet 442. This design avoids the disorderly flow of gas inside the third airbag 44, ensuring the smoothness of the inflation process, enabling the second airbag 2 to expand quickly and effectively, and providing timely neck protection for the user. The one-way valves are provided on both the air outlet 441 and the air inlet 442, and their key role is to ensure the one-way flow of gas. During the inflation process, the one-way valve only allows gas to enter the third airbag 44 from the air inlet 442 and then flow out from the air outlet 441 into the second airbag 2, without gas backflow. This avoids the instability of the pressure inside the third airbag 44 caused by gas backflow, affecting the inflation effect, and ensures that the second airbag 2 can expand continuously and stably, providing reliable neck protection for the user.

[0065] In one embodiment, the extrusion member includes: a sealing plate 41 disposed on the life jacket 1 for sealing the mounting groove 101; an extrusion plate 411 disposed on a side of the sealing plate 41 close to the third airbag 44 and abutting against a side of the third airbag 44 away from the inflation tube 45 for extruding the third airbag 44; a pull rod 42 disposed on a side of the sealing plate 41 away from the extrusion plate 411 and passing through the life jacket 1 for driving the extrusion plate 411 to move inside the life jacket 1; a moving groove 102 is formed on the life jacket 1 for the sealing plate 41 to move; a limiting groove 103 for mounting the sealing plate 41 is disposed on a side of the life jacket 1 away from the moving groove 102.

[0066] With such a design, referring to Figures 6-10 , the presence of the sealing plate 41 can effectively prevent external dust, debris, etc. from entering the mounting groove 101, avoiding damage to the third airbag 44 caused by these debris and affecting its normal inflation function. When it is necessary to inflate the second airbag 2, the pull rod 42 is used to drive the extrusion plate 411 to move. The extrusion plate 411 applies pressure to the third airbag 44, and the gas is pressed from the air outlet 441 into the second airbag 2, ensuring that the second airbag 2 can expand in time to provide effective neck protection for the user. The moving groove 102 formed on the life jacket 1 allows the sealing plate 41 to move, providing a clear track for the movement of the sealing plate 41, so that the sealing plate 41 can remain stable during movement without shaking or deviation, which helps to ensure that the extrusion plate 411 can accurately extrude the third airbag 44 and ensure the smooth progress of the inflation process. When the sealing plate 41 moves to the designated position, it can be snapped into the limiting groove 103 to prevent the sealing plate 41 from moving excessively. This limiting effect ensures that the sealing plate is in the appropriate position to protect the components inside the mounting groove 101.

[0067] In one embodiment, the extrusion member further includes: a pull block 43 disposed on a side of the pull rod 42 outside the life jacket 1 and a side connected to the life jacket 1 is provided with a magic tape for pulling the pull rod 42 to move inside the life jacket 1.

[0068] With such a design, referring to Figure 6 , the pull block 43 is disposed on a side of the pull rod 42 outside the life jacket 1. Compared with directly pulling the pull rod 42, the pull block 43 increases the contact area between the operator's hand and the pull rod 42. In an emergency, the operator can more easily hold the pull block 43 and apply a pulling force. A side of the pull block 43 connected to the life jacket 1 is provided with a magic tape. This design enables the pull block 43 to be detached and fixed to the life jacket 1 as needed. When not in use, the pull block 43 is fixed to the life jacket 1 to avoid accidental contact of the pull block 43, resulting in the extrusion of the third airbag 44 by the extrusion plate 411 to inflate the second airbag 2.

[0069] In one embodiment, the extrusion member further includes: an elastic member 46 sleeved on the portion of the pull rod 42 between the sealing plate 41 and the moving groove 102, and the elastic member 46 is made of a spring with damping or an elastic pad.

[0070] With such a design, referring to Figure 6 and Figure 7 , when the pull rod 42 pulls the sealing plate 41 to move towards the inside of the installation groove 101, the sealing plate 41 squeezes the elastic member 46. After the sealing plate 41 moves to the maximum, the pull rod 42 is released, and the elastic restoring force of the elastic member 46 will make the pull rod 42 automatically return to the initial position. This automatic reset function facilitates the next operation, eliminating the need for the operator to manually reset the pull rod 42, thereby improving the convenience and efficiency of the operation.

[0071] In one embodiment, the life jacket 1 further includes: a fixing buckle 13 provided on the life jacket 1 for fixing the life jacket 1 to the user.

[0072] With such a design, referring to Figure 1 and Figure 2 , the fixing buckle 13 is provided on the life jacket 1, which facilitates the staff to wear it and enables the life jacket 1 to better fit on the construction worker's body, providing continuous protection for the user. The fixing buckle 13 has a certain degree of adjustability, improving the versatility and applicability of the life jacket 1.

[0073] In one embodiment, the protection device further includes: a heating patch 5 provided inside the life jacket 1 and pressing to generate heat inside the installation groove 101 for heating the user's body. The heating patch 5 is a prior art and will not be elaborated here.

[0074] With such a design, referring to Figure 4 and Figure 8 , during the construction of the drainage culvert, the construction environment may be relatively cold, especially in winter or areas with a low groundwater level. Prolonged exposure to a low-temperature environment can cause the user's body to lose heat easily, leading to a drop in body temperature. The heating patch 5 is provided inside the life jacket 1 and presses to generate heat. When the sealing cover 41 is pulled open from the installation groove 101, the pressing plate 411 squeezes the third airbag 44. At this time, the heating patch 5 is exposed inside the installation groove 101, and then the heating patch 5 inside the installation groove 101 is pressed to make the heating patch 5 start to generate heat, which can provide warmth for the construction worker's body, help maintain the core body temperature, and prevent hypothermia symptoms caused by low temperature, such as shivering, increased heart rate, and slow reaction, thus ensuring the health of the user.

[0075] In one embodiment, the anti - detachment component 3 includes: a drawstring 31 disposed at the upper end of the second airbag 2 and moving upward with the inflation of the second airbag 2; a branching section 32 disposed at the lower end of the drawstring 31; an anti - detachment rope 33 with one end disposed on the branching section 32 and the other end disposed on the fixed buckle 13. The anti - detachment rope 33 passes through the crotch of the user and is tightened around the crotch of the user under the drive of the drawstring 31. A limiting belt 14 for restricting the drawstring 31 is provided on the life jacket 1.

[0076] With such a design, referring to Figures 1-3 and Figure 8 , the drawstring 31 is disposed at the upper end of the second airbag 2. When the second airbag 2 expands and moves upward due to inflation, the drawstring 31 will move synchronously therewith. The linkage relationship between the drawstring 31 and the second airbag 2 ensures that the anti - detachment mechanism functions at the appropriate time. When wearing the life jacket 1, the anti - detachment rope 33 is in a loose state, which facilitates the construction worker to insert the legs into the anti - detachment rope 33. Then, when the second airbag 2 is inflated, the anti - detachment rope 33 can be tightened, so that the lower opening of the life jacket 1 fits better with the body of the construction worker. The branching section 32 is disposed at the lower end of the drawstring 31, providing a reasonable transition point for the connection of the anti - detachment rope 33. The anti - detachment rope 33 branches at the branching section 32, enabling the anti - detachment rope 33 to be fixed on the two legs of the construction worker, further improving the stability of the installation of the life jacket 1 and enhancing the anti - detachment effect.

[0077] In addition, if there are descriptions involving "first", "second", etc. in the embodiment, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance to the specification or the number of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature.

Claims

1. A protective device for the construction of a drainage culvert, comprising a life jacket (1), characterized in that, It further includes: A second airbag (2), arranged at the upper part of the life jacket (1) for protecting the user's neck; An inflation assembly (4), arranged inside the life jacket (1) and connected to the second airbag (2) for inflating the second airbag (2); An anti - detachment assembly (3), arranged on the life jacket (1) and passing through the user's crotch from below the life jacket (1) and connected to the second airbag (2) for preventing the life jacket (1) from falling off the user's body.

2. The protective device for the construction of a drainage culvert according to claim 1, characterized in that: The protection device further includes: An air cylinder (11), arranged on the life jacket (1); A first airbag (12), arranged on the life jacket (1) and located at the user's chest position for inflating and expanding when the air cylinder (11) is opened, enabling the user to float face - up on the water surface; A fixing strap (111) for fixing the air cylinder (11) is arranged on the life jacket (1).

3. The protective device for the construction of a drainage culvert according to claim 1, characterized in that: The inflation assembly (4) includes: A third airbag (44), arranged inside the life jacket (1) and connected to the second airbag (2) through an inflation pipe (45) for inflating the second airbag (2); A squeezing member, arranged on the life jacket (1) for manually inflating the third airbag (44); An installation groove (101) for placing the third airbag (44) is formed on the life jacket (1).

4. The protective device for the construction of a drainage culvert according to claim 3, characterized in that: The third airbag (44) includes: An air outlet (441), arranged at the position where the third airbag (44) is connected to the inflation pipe (45); An air inlet (442), on one side of the third airbag (44) for inflating the inside of the third airbag (44); One - way valves are arranged on both the air outlet (441) and the air inlet (442).

5. The protective device for the construction of a drainage culvert according to claim 3, characterized in that: The squeezing member includes: A sealing plate (41), arranged on the life jacket (1) for sealing the installation groove (101); A squeezing plate (411), arranged on the side of the sealing plate (41) close to the third airbag (44) and abutted against the side of the third airbag (44) away from the inflation pipe (45) for squeezing the third airbag (44); A pull rod (42), arranged on the side of the sealing plate (41) away from the squeezing plate (411) and passing through the life jacket (1) for driving the squeezing plate (411) to move inside the life jacket (1); A moving groove (102) for the sealing plate (41) to move is formed on the life jacket (1); A limiting groove (103) for installing the sealing plate (41) is arranged on the side of the life jacket (1) away from the moving groove (102) of the sealing plate (41).

6. The protective device for the construction of a drainage culvert according to claim 5, characterized in that: The squeezing member further includes: A pull block (43), arranged on the side of the pull rod (42) outside the life jacket (1) and having a magic tape on the side connected to the life jacket (1) for pulling the pull rod (42) to move inside the life jacket (1).

7. A protective device for construction of a drainage culvert according to claim 5, characterized in that: The squeezing member further includes: The elastic member (46) is sleeved on the part of the pull rod (42) located between the sealing plate (41) and the moving groove (102).

8. A protective device for the construction of a drainage culvert according to claim 1, characterized in that: The life jacket (1) further includes: A fixing buckle (13) is provided on the life jacket (1) for fixing the life jacket (1) to the user.

9. The protective device for the construction of a drainage culvert according to claim 3, characterized in that: The protection device further includes: A heating patch (5) is provided inside the life jacket (1) and presses to generate heat inside the installation groove (101) for heating the user's body.

10. A protection device for the construction of a drainage culvert according to claim 8, characterized in that: The anti - detachment assembly (3) includes: A pull rope (31) is provided at the upper end of the second airbag (2) and moves upward as the second airbag (2) expands; A branching section (32) is provided at the lower end of the pull rope (31); An anti - detachment rope (33) has one end provided on the branching section (32) and the other end provided on the fixing buckle (13). The anti - detachment rope (33) passes through the user's crotch and is tightened around the user's crotch under the drive of the pull rope (31); A limiting belt (14) for restricting the pull rope (31) is provided on the life jacket (1).

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