A lifting type string drum and a construction method for pouring concrete by using the same

Abstract

The application discloses a lifting type string drum, which comprises a string drum body, a connecting chain, a hanging lug and a flexible side skirt; the hanging lug comprises a top layer hanging lug, a middle layer hanging lug and a bottom layer hanging lug, the top layer hanging lug is arranged on the inner wall of the string drum body, the middle layer hanging lug and the bottom layer hanging lug are arranged on the outer wall of the string drum body; the flexible side skirt is fixed to the outer wall of the string drum body and covers the bottom layer hanging lug; when two lifting type string drums are connected, the length of the flexible side skirt of the previous lifting type string drum can cover the upper hanging lug of the previous lifting type string drum, and the top layer hanging lug of the next lifting type string drum and the bottom layer hanging lug of the next lifting type string drum are connected through the chain. The inner and outer hanging lugs are arranged in layers, and the flexible side skirt is matched, so that the hanging lugs are shielded and protected from being exposed and contaminated; and through the cooperation of the flow guiding lip, the annular flow guiding gap and the slurry discharge hole, splashed and downflowing slurry can be guided to flow back and residual slurry can be discharged, so that the slurry is prevented from accumulating and hardening in the hanging lug area.

Description

Technical Field

[0001] This invention relates to the field of concrete pouring using a lifting tremie pipe. More specifically, this invention relates to a lifting tremie pipe and a construction method for pouring concrete using it. Background Technology

[0002] In concrete pouring construction, lifting tremies are commonly used in high-rise or deep foundation pit pouring operations. By connecting multiple sections of the tremie pipe, the pouring channel is extended, preventing segregation during concrete descent. However, existing lifting tremies have several problems affecting construction efficiency and equipment lifespan. The lugs on existing tremies are mostly concentrated on the outer or inner wall. When multiple sections are connected, the lugs and connecting chains are exposed. During concrete pouring, some grout easily flows down the outer wall of the tremie pipe or splashes, contaminating the lug surface and chain connection points. Long-term use leads to grout accumulation and hardening in the lug holes and on the chain surface, affecting the chain's engagement flexibility and even causing chain jamming, making quick disconnection difficult and reducing the efficiency of lifting and dismantling the tremie pipe. Summary of the Invention

[0003] To achieve these objectives and other advantages according to the invention, in one aspect, a preferred embodiment of the invention provides a lifting spool, including a spool body, a connecting chain, lugs, and a flexible side skirt; the lugs include a top lug, a middle lug, and a bottom lug, the top lug being disposed on the inner wall of the spool body, and the middle and bottom lugs being disposed on the outer wall of the spool body; the flexible side skirt is fixed to the outer wall of the spool body and covers the bottom lug; When two lifting drums are connected, the length of the flexible side skirt of the previous lifting drum can cover the upper lug of the previous lifting drum, and the top lug of the next lifting drum and the bottom lug of the next lifting drum are connected by a chain.

[0004] Preferably, the top-level hook, the middle hook, and the bottom-level hook are all provided with through holes for attaching the chain.

[0005] Preferably, the lower edge of the flexible side skirt is provided with an inwardly folded guide lip, which extends 30–50 mm along the axial direction of the spool body, and forms an annular guide gap between its inner surface and the outer wall of the spool body. When two adjacent lifting spools are connected vertically, the guide lip of the upper spool is precisely embedded in the area above the top hanging ear of the lower spool, and guides the concrete splash or grout flowing down the outer wall back into the spool, preventing grout from overflowing and contaminating the hanging ear and chain connection parts. The annular guide gap extends axially to the bottom of the spool body. At least one grout discharge hole is provided on the outer wall of the spool body at a position corresponding to the bottom hanging ear. The grout discharge hole is connected to the annular guide gap and is used to discharge a small amount of grout that accidentally seeps into the gap to an external collection tank, preventing the grout from accumulating and hardening in the hanging ear area.

[0006] Preferably, the inner side of the flexible side skirt is provided with at least one annular cavity along the circumferential direction. The annular cavity is connected to the inner cavity of the tremie cylinder body through a radial connecting hole. When concrete falls into the tremie cylinder body, some airflow or slurry droplets enter the annular cavity through the radial connecting hole, causing the flexible side skirt to expand radially due to the increase in internal pressure. The guide lip at its lower edge then adheres tightly to the outer wall of the adjacent tremie cylinder below, forming a dynamic fit seal. When pouring stops and the internal pressure is released, the flexible side skirt retracts due to its own elasticity, returning to a relaxed state, which is convenient for lifting and disassembly.

[0007] On the other hand, a preferred embodiment of the present invention provides a construction method for pouring concrete using a lifting tremie pipe, comprising the following steps: S1. Connecting chains are used to connect the lifting drums and the hoppers. S2. As the concrete pouring surface rises, lift one section of the lifting tremie pipe in preparation for dismantling. The specific operation is as follows: S21. After raising it to the height of one section of the lifting drum, connect the conversion chain that was pre-installed on the previous lifting drum to the lug on the top second lifting drum. S22. First, release the connecting chain between the second lifting spool and the first lifting spool, then release the connecting chain between the first lifting spool and the hopper. S23. Remove the first top lifting cylinder; S24. Lift the remaining lifting drum upwards as a whole, connect the second lifting drum to the hopper, and finally hang the conversion chain on the top hanging ear to complete one lifting cycle. S24. Repeat until all concrete pouring work is completed.

[0008] Preferably, after the shunt connection is completed in step S1, concrete is poured. The positive pressure airflow generated in the shunt during the concrete fall causes the annular cavity in the flexible side skirt to automatically pressurize and expand. The guide lip is pressed tightly against the outer wall of the lower shunt to suppress grout overflow. Before removing the top shunt in step S23, pouring is paused for 3-5 seconds. After the pressure in the shunt is balanced and the flexible side skirt retracts, the chain is released and the shunt is lifted away to ensure smooth separation without jamming.

[0009] Preferably, in step S21, after the second top lifting duct is lifted into place, an axial micro-vibration is applied for 0.5–1.5 seconds by the tower crane hook, with a frequency of 2–5Hz and an amplitude of 3–8mm. This causes the lower edge guide lip of the flexible side skirt of the upper duct to automatically slide into the predetermined fitting position above the top hanging ear of the lower duct under the assistance of vibration. At the same time, it promotes the discharge of residual air in the annular cavity, enhancing the sealing fit during subsequent pouring.

[0010] Preferably, during each pause in pouring to release the pressure on the flexible side skirt, the compressed air nozzles installed on the outer wall of the tremie pipe are simultaneously activated to blow a brief airflow into the annular guide gap between the flexible side skirt and the outer wall of the tremie pipe, sweeping any slurry particles that may be trapped to the slurry discharge hole for discharge.

[0011] The present invention offers at least the following advantages: Firstly, by layering inner and outer hanging ears with flexible side skirts, the hanging ears are shielded and protected, preventing exposure and contamination. Secondly, by using a guide lip, annular guide gap, and grout discharge hole in synergy, splashed and flowing grout can be guided back and residual grout discharged, preventing grout accumulation and hardening in the hanging ear area. Thirdly, the present invention also incorporates an annular cavity, achieving dynamic sealing through the positive pressure of falling concrete. After pouring stops, the cavity elastically retracts, and in conjunction with pauses in pressure release, axial micro-vibration, and compressed air purging during construction, smooth separation of the tremie pipe is ensured, significantly improving construction efficiency, extending equipment lifespan, reducing maintenance costs, and guaranteeing continuous concrete pouring.

[0012] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the lifting drum in one embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the lifting drum structure in another embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram showing the connection of two lifting drums in one embodiment of the present invention.

[0016] Figure 4 This is a construction diagram of two lifting ducts under normal pouring conditions in one embodiment of the present invention.

[0017] Figure 5 This is a construction diagram of two lifting ducts in a pre-disassembly state according to one embodiment of the present invention. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0019] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0020] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0021] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0022] like Figure 1-5 As shown, a preferred embodiment of the present invention provides a lifting skewer, including a skewer body 1, a connecting chain 2, hanging ears, and a flexible side skirt 6; the hanging ears include a top hanging ear 3, a middle hanging ear 4, and a bottom hanging ear 5, the top hanging ear 3 being disposed on the inner wall of the skewer body 1, and the middle hanging ear 4 and the bottom hanging ear 5 being disposed on the outer wall of the skewer body 1; the flexible side skirt 6 is fixed to the outer wall of the skewer body 1 and covers the bottom hanging ear 5 inside; When two lifting drums are connected, the length of the flexible side skirt of the previous lifting drum can cover the upper lug of the previous lifting drum, and the top lug of the next lifting drum and the bottom lug of the next lifting drum are connected by a chain.

[0023] In this embodiment, the main structure of the tremie pipe body, used for conveying concrete slurry, is a hollow cylinder designed to guide the concrete slurry along a preset path, preventing slurry splashing and segregation. The flexible side skirt 6 possesses certain wear resistance, waterproofing, and flexibility. The bottom end of the flexible side skirt 6 hangs down naturally, and its length is set to completely cover the bottom hanging lug 5. A 5mm gap is maintained between the flexible side skirt 6 and the outer wall of the tremie pipe body 1, allowing the flexible side skirt 6 to deform during subsequent use while preventing excessive gaps that could cause slurry seepage. When two lifting tremie pipes are connected, the length of the flexible side skirt 6 of the upper lifting tremie pipe is set to cover the bottom hanging lug 5 of the upper pipe. The top hanging lug 3 of the lower lifting tremie pipe is connected to the bottom hanging lug 5 of the upper pipe via a connecting chain 2. During the pouring operation, concrete slurry flows from the hopper into the tremie drum body 1, falls uniformly along the hollow channel of the drum body 1, and is finally delivered to the pouring surface. The hollow structure of the drum body 1 effectively prevents the concrete slurry from coming into excessive contact with air during its descent, preventing slurry splashing and segregation, and ensuring pouring quality. Throughout this process, the flexible side skirt 6 always covers the bottom hanging lug 5 and the connection points of adjacent drums, preventing concrete slurry from splashing or flowing down the outer wall of the drum and contaminating the hanging lugs and chain connections. This also prevents slurry from accumulating and hardening in the hanging lug holes, ensuring the connecting chain 2 can move flexibly and facilitating subsequent lifting and dismantling of the drum. When the pouring surface rises and the drum needs to be lifted, the hook of the lifting equipment is engaged with the middle hanging lug 4, and the lifting equipment applies an upward lifting force, causing the entire drum to move upward.

[0024] The present invention also provides the following technical solution, wherein the top hanging ear, the middle hanging ear and the bottom hanging ear are all provided with through holes for attaching the chain.

[0025] The present invention also provides the following technical solution: the lower edge of the flexible side skirt is provided with an inwardly folded guide lip 8, the guide lip extending axially along the main body of the spool for a length of 30-50mm, and its inner surface forming an annular guide gap with the outer wall of the main body of the spool; when two adjacent lifting spools are connected vertically, the guide lip of the upper spool is precisely embedded in the area above the top hanging ear of the lower spool, and guides the concrete splash or grout flowing down the outer wall back into the spool, preventing the grout from overflowing and contaminating the hanging ear and chain connection parts. The annular guide gap extends axially to the bottom of the spool body; at least one grout discharge hole 7 is provided on the outer wall of the spool body at a position corresponding to the bottom hanging ear, the grout discharge hole is connected to the annular guide gap, and is used to discharge a small amount of grout that accidentally seeps into the gap to an external collection tank, avoiding the grout from accumulating and hardening in the hanging ear area.

[0026] In this embodiment, during the concrete pouring process, concrete slurry flows from the hopper into the tremie drum body 1 and falls along the hollow channel of the tremie drum body 1. During the fall, some slurry may splash due to excessive flow velocity, gaps in the tremie drum connection, or flow downwards along the outer wall of the tremie drum body 1. When the slurry splashes onto the inner wall of the flexible side skirt 6, or flows downwards along the outer wall of the tremie drum to the position of the flexible side skirt 6, the lower edge of the flexible side skirt 6 is provided with an inwardly folded guide lip 8, and an annular guide gap is formed between the guide lip 8 and the outer wall of the tremie drum body 1. Under the guidance of the guide lip 8, the slurry will flow downwards along the annular guide gap and eventually flow back to the bottom of the tremie drum body 1 before entering the next section of the tremie drum. This achieves the recycling of slurry and prevents slurry from overflowing to the lugs and chain connection parts, preventing slurry from contaminating the lugs, clogging the through holes, or causing the connecting chain 2 to rust or jam. During this process, the inward folding structure of the guide lip 8 effectively blocks the overflow path of the grout. Its flexible material can fit tightly against the inner wall of the top of the next section of the tremie cylinder, further enhancing the sealing effect and reducing the possibility of grout overflow. Since the annular guide gap extends axially to the bottom of the tremie cylinder body 1, it ensures that the grout flows smoothly within the gap, avoiding blockage. During long-term pouring operations, a small amount of grout may accidentally seep into the annular guide gap and cannot flow back into the tremie cylinder body 1 in time. At this time, this small amount of grout will flow downward along the annular guide gap. When it flows to the position of the grout discharge hole 7, it will be discharged through the grout discharge hole 7 into the collection tank outside the tremie cylinder, preventing the grout from accumulating in the annular guide gap. Especially after the pouring operation is paused or completed, the residual grout will gradually harden. If it accumulates in the gap, it will cause the flexible side skirt 6 to stick to the tremie cylinder body 1, affecting the subsequent lifting and dismantling of the tremie cylinder. The setting of the grout discharge hole 7 can effectively solve this problem, ensuring that there is no grout accumulation in the annular guide gap. When two adjacent sections of the sluice tube are connected, the guide lip 8 of the upper section of the sluice tube is embedded in the area above the top hanging lug 3 of the lower section of the sluice tube. This can further prevent the slurry from overflowing from the connection gap between the adjacent sections of the sluice tube, while guiding the slurry at the connection gap to flow back or be discharged along the annular guide gap, forming a double protection.

[0027] The present invention also provides the following technical solution: the inner side of the flexible side skirt 6 is provided with at least one annular cavity 9 along the circumferential direction, and the annular cavity is connected to the inner cavity of the tremie cylinder body through a radial connecting hole 10; the connecting hole 10 is provided on the side wall of the tremie cylinder body. When concrete falls into the tremie cylinder body, some airflow or slurry droplets enter the annular cavity through the radial connecting hole, causing the flexible side skirt to expand radially due to the increase in internal pressure. The guide lip at its lower edge then tightly adheres to the outer wall of the adjacent tremie cylinder below, forming a dynamic fit seal; when pouring stops and the internal pressure is released, the flexible side skirt retracts due to its own elasticity and returns to a relaxed state, which is convenient for lifting and disassembly.

[0028] In this embodiment, the annular cavity 9 is disposed inside the flexible side skirt 6 and is continuously distributed along the circumference of the spool body 1, forming a closed annular structure. The position of the annular cavity 9 corresponds to the middle area of ​​the outer wall of the spool body 1, ensuring that when the annular cavity 9 expands, it can effectively drive the lower edge of the flexible side skirt 6 to expand outward, achieving a tight seal with the lower spool. The radial connecting hole 10 is formed on the wall surface of the spool body 1 and is distributed radially along the spool body 1, used to connect the inner cavity of the spool body 1 with the annular cavity 9 of the flexible side skirt 6.

[0029] Before the concrete pouring operation begins, the flexible side skirt 6 is in a naturally relaxed state, with no pressure in its inner annular cavity 9, maintaining a certain gap with the outer wall of the tremie cylinder body 1, and the guide lip 8 hangs down naturally. At this time, the assembly and connection of the tremie cylinder can be carried out smoothly without the inconvenience caused by the constraint of the flexible side skirt 6. When the concrete pouring begins, the concrete slurry flows from the hopper into the tremie cylinder body 1 and falls uniformly along the hollow channel of the tremie cylinder body 1. Due to the relatively fast falling speed of the concrete slurry, a certain positive pressure airflow is generated in the tremie cylinder body 1, and some slurry droplets move with the airflow. These positive pressure airflows and slurry droplets enter the annular cavity 9 inside the flexible side skirt 6 through the radial connecting holes 10 on the wall of the tremie cylinder body 1. As the pouring operation continues, more and more airflows and slurry droplets enter the annular cavity 9, causing the pressure inside the annular cavity 9 to gradually increase. Because the annular cavity 9 is a closed structure, when the internal pressure increases, it exerts an outward thrust on the inner wall of the annular cavity 9, causing the flexible side skirt 6 to expand radially outward. The overall diameter of the flexible side skirt 6 increases, and its lower edge guide lip 8 also expands outward accordingly, gradually approaching and tightly adhering to the outer wall of the adjacent lower cylinder, forming a dynamic, tightly sealed state. This sealing state effectively prevents the overflow of concrete slurry, especially at the joint gap between adjacent cylinders. The tightly fitting guide lip 8 further enhances the sealing effect, preventing slurry from overflowing from the joint gap and contaminating the lugs and chain connection parts. During this process, the degree of expansion of the annular cavity 9 is determined by the intensity of the positive pressure airflow inside the tremie cylinder body 1. The faster the pouring speed, the stronger the positive pressure airflow inside the tremie cylinder, the greater the degree of expansion of the annular cavity 9, the tighter the fit between the flexible side skirt 6 and the outer wall of the lower tremie cylinder, and the better the sealing effect. If the pouring speed is slowed down, the positive pressure airflow inside the tremie cylinder weakens, and the pressure inside the annular cavity 9 will also decrease accordingly. The degree of expansion of the flexible side skirt 6 will be appropriately reduced, but it can still maintain a certain fit and sealing state to ensure the stability of the sealing effect.

[0030] When the pouring operation is paused or the top duct needs to be removed, the supply of concrete grout to the duct is stopped. The concrete grout in the duct body 1 gradually falls to the pouring surface, and the positive pressure airflow in the duct body 1 is gradually released. The airflow and grout droplets in the annular cavity 9 will flow back into the duct body 1 through the radial connecting hole 10, or be discharged through the annular guide gap and grout discharge hole 7. The pressure inside the annular cavity 9 gradually decreases to atmospheric pressure. At this time, the flexible side skirt 6, relying on its own elastic recovery performance, gradually retracts to its initial relaxed state. The guide lip 8 at its lower edge separates from the outer wall of the adjacent duct below, no longer forming a seal. This facilitates the subsequent lifting and removal of the duct, avoiding separation difficulties and jamming caused by the flexible side skirt 6 being too tightly attached to the lower duct. The final effects of this embodiment are as follows: By setting an annular cavity 9 inside the flexible side skirt 6 and a radial connecting hole 10 on the duct body 1, dynamic sealing and elastic retraction of the flexible side skirt 6 are achieved, solving the problems of poor sealing effect of traditional flexible side skirts and easy jamming during duct lifting and dismantling; during the pouring process, the positive pressure airflow naturally generated inside the duct causes the flexible side skirt 6 to automatically expand and fit, without the need for an additional power device, resulting in a simple structure and high energy efficiency; the dynamic sealing can automatically adjust the tightness of the fit according to the pouring speed, ensuring a stable sealing effect, effectively preventing grout overflow, and protecting the lugs and chain connection parts; after pouring stops, the flexible side skirt 6 automatically retracts, facilitating the lifting and dismantling of the duct and improving construction efficiency.

[0031] The present invention also provides the following technical solution: a construction method for pouring concrete using a lifting tremie pipe, which includes the following steps: S1. Connecting chains are used to connect the lifting drums and the hoppers. S2. As the concrete pouring surface rises, lift one section of the lifting tremie pipe in preparation for dismantling. The specific operation is as follows: S21. After raising it to the height of one section of the lifting drum, connect the conversion chain that was pre-installed on the previous lifting drum to the lug on the top second lifting drum. S22. First, release the connecting chain between the second lifting spool and the first lifting spool, then release the connecting chain between the first lifting spool and the hopper. S23. Remove the first top lifting cylinder; S24. Lift the remaining lifting drum upwards as a whole, connect the second lifting drum to the hopper, and finally hang the conversion chain on the top hanging ear to complete one lifting cycle. S24. Repeat until all concrete pouring work is completed.

[0032] In this embodiment, a concrete conveying channel is formed by connecting shunts, achieving stable slurry delivery. Simultaneously, through multiple small-cycle lifting operations, the top shunt is gradually removed as the pouring surface rises, ensuring continuous pouring operations and adapting to different pouring height requirements. In step S1, the shunts are connected by connecting chains 2, which fix the lugs of adjacent shunts. The load-bearing capacity of the lugs and chains ensures the stability of the shunt structure. Flexible side skirts 6 cover the lug connection areas to prevent slurry contamination. The connection between the shunt and the hopper 14 ensures that the slurry flows smoothly into the shunt, preventing leakage. After the pouring operation begins, the concrete slurry flows from the hopper 14 into the shunt and falls along the shunt channel to the pouring surface. The hollow structure of the shunt effectively prevents slurry splashing and segregation, ensuring pouring quality. As the pouring operation progresses, the pouring surface gradually rises, and the top shunt gradually detaches from the pouring surface, ceasing its conveying function. At this point, the excess shunt needs to be removed through the small-cycle lifting operation in step S2. In S21, the tremie pipe is raised to one section length, and the conversion chain 11 is attached. The purpose of this is to temporarily support the weight of the tremie pipe using the conversion chain 11, providing safety for disconnecting and dismantling the pipe and preventing accidental falls after disconnection. In S22, the connection between the second tremie pipe and the first tremie pipe is first disconnected, followed by the connection between the first tremie pipe and the hopper 14. This sequence ensures that the first tremie pipe always has a component supporting its weight before all connections are disconnected, preventing accidental falls and ensuring construction safety. In S23, after dismantling the first tremie pipe, the number of tremie pipe sections is reduced, allowing the remaining tremie pipe to adapt to the raised pouring surface. In S24, the remaining tremie pipe is raised and reconnected to the hopper 14, and the conversion chain 11 is attached to the top lug 15. This ensures a reliable connection between the remaining tremie pipe and the hopper 14, allowing continued pouring operations, and also improves the stability of the remaining tremie pipe through the auxiliary fixation of the conversion chain 11, preventing swaying and ensuring smooth pouring operations. The small-scale circulation is repeatedly improved and the tremie pipe is gradually dismantled until the pouring surface reaches the preset height, thus completing the pouring operation.

[0033] The present invention also provides the following technical solution: after the connection of the cistern is completed in step S1, concrete is poured. The positive pressure airflow generated in the cistern during the falling of the concrete causes the annular cavity in the flexible side skirt to automatically pressurize and expand. The guide lip is in close contact with the outer wall of the lower cistern to suppress the overflow of grout. Before the top cistern is removed in step S23, the pouring is paused for 3-5 seconds. After the pressure in the cistern is balanced and the flexible side skirt retracts, the chain is released and the cistern is lifted away to ensure smooth separation without jamming.

[0034] During the concrete pouring process, the positive pressure airflow generated by the falling concrete slurry is the power source for the dynamic sealing of the flexible side skirt 6. The positive pressure airflow refers to the airflow with a certain pressure formed by the concrete slurry pushing the air inside the duct during its fall, which is greater than the external atmospheric pressure. The radial connecting hole 10 connects the inner cavity of the duct body with the annular cavity 9, allowing the positive pressure airflow to smoothly enter the annular cavity 9, pushing the flexible side skirt 6 to expand, and achieving a sealing between the guide lip 8 and the outer wall of the lower duct. Through this dynamic sealing, the slurry overflow can be effectively prevented, protecting the lugs and chain connection parts, and ensuring the smooth progress of the pouring operation. If pouring is not paused and the pressure inside the duct is not released when preparing to dismantle the top duct, a certain pressure will remain in the annular cavity 9, and the flexible side skirt 6 will continue to expand. The guide lip 8 will be tightly attached to the outer wall of the lower duct. If the duct connection is released at this time, friction will occur between the ducts due to the contact of the flexible side skirt 6, making separation difficult and causing jamming. This not only affects construction efficiency but may also lead to tearing of the flexible side skirt 6, damage to the duct, and even safety hazards. Therefore, pausing pouring for 3-5 seconds before dismantling the duct allows the positive pressure airflow inside the duct to gradually release, balancing the pressure inside the duct with the external atmospheric pressure. The pressure inside the annular cavity 9 also decreases, and the flexible side skirt 6 retracts under its own elasticity, separating the guide lip 8 from the outer wall of the lower duct. With the friction disappearing, the top duct can be easily lifted away after disconnecting the duct connection, avoiding jamming, protecting the structural integrity of the duct and the flexible side skirt 6, and improving both construction efficiency and safety. The pause time setting needs to balance pressure release effect and construction efficiency. A pause time of 3-5 seconds can ensure that the pressure inside the tremie pipe is completely released and the flexible side skirt 6 is completely retracted, without affecting the progress of the pouring operation too much. If the pouring speed is fast and the positive pressure airflow inside the tremie pipe is strong, the pause time can be appropriately extended to 5 seconds; if the pouring speed is slow and the positive pressure airflow is weak, the pause time can be appropriately shortened to 3 seconds.

[0035] The present invention also provides the following technical solution: In step S21, after the second top lifting duct is lifted into place, an axial micro-vibration is applied for 0.5–1.5 seconds by the tower crane hook, with a frequency of 2–5Hz and an amplitude of 3–8mm. This causes the lower edge guide lip of the flexible side skirt of the upper duct to automatically slide into the predetermined fitting position above the top hanging ear of the lower duct under the assistance of vibration. At the same time, it promotes the discharge of residual air in the annular cavity, enhancing the sealing fit during subsequent pouring.

[0036] After the duct is raised to the predetermined height, the guide lip 8 of the flexible side skirt 6 may not be able to fit smoothly into the predetermined fitting position due to its own elasticity, slight displacement, or residual air in the annular cavity 9, or the fit may not be tight after fitting, affecting the sealing effect. At this time, by applying axial micro-vibration along the axis of the duct by the tower crane, the slight impact force generated by the vibration can be transmitted to the flexible side skirt 6, causing the guide lip 8 to shake slightly, overcoming its own elastic resistance and fitting friction, so that it can be accurately fitted into the predetermined fitting position, ensuring that the embedding depth meets the standard. At the same time, the vibration can cause the residual air in the annular cavity 9 to flow back into the duct body 1 through the radial connecting hole 10, or be discharged through the annular guide gap and the slurry discharge hole 7, avoiding the formation of local air masses in the annular cavity 9, which would cause uneven expansion of the flexible side skirt 6, thereby ensuring that the guide lip 8 fits fully with the outer wall of the lower duct, improving the dynamic sealing effect. The vibration amplitude is 5-8mm, the frequency is 10-15Hz, and the duration is 2-3 seconds. This can meet the needs of auxiliary fitting and air venting without causing the spool structure to shake, the connecting chain 2 to loosen, or damage to components such as the flexible side skirt 6 and the annular cavity 9 due to excessive vibration.

[0037] This invention also provides a technical solution whereby, during each pause in pouring to release pressure on the flexible side skirt, a compressed air nozzle located on the outer wall of the tremie pipe is simultaneously activated to blow a brief airflow into the annular guide gap between the flexible side skirt and the outer wall of the tremie pipe. This blows any potentially trapped grout particles to the discharge hole for removal. This ensures the effectiveness of axial micro-vibration, guarantees proper fitting and reliable sealing of the guide lip 8, further reduces concrete grout overflow, and improves pouring quality. Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A lifting-type stringing drum, characterized in that, The device includes a spool body, a connecting chain, hanging ears, and a flexible side skirt; the hanging ears include a top hanging ear, a middle hanging ear, and a bottom hanging ear, the top hanging ear being disposed on the inner wall of the spool body, and the middle and bottom hanging ears being disposed on the outer wall of the spool body; the flexible side skirt is fixed to the outer wall of the spool body and covers the bottom hanging ear inside. When two lifting drums are connected, the length of the flexible side skirt of the previous lifting drum can cover the upper lug of the previous lifting drum, and the top lug of the next lifting drum and the bottom lug of the next lifting drum are connected by a chain.

2. The lifting-type stringer according to claim 1, characterized in that, The top-level hook, middle hook, and bottom-level hook are all provided with through holes for attaching chains.

3. The lifting-type string drum according to claim 1, characterized in that, The lower edge of the flexible side skirt is provided with an inwardly folded guide lip. The guide lip extends 30–50 mm along the axial length of the spool body, and its inner surface forms an annular guide gap with the outer wall of the spool body. When two adjacent lifting spools are connected vertically, the guide lip of the upper spool is precisely embedded in the area above the top hanging ear of the lower spool, and guides the concrete splash or grout flowing down the outer wall back into the spool, preventing grout from overflowing and contaminating the hanging ear and chain connection parts. The annular guide gap extends axially to the bottom of the spool body. At least one grout discharge hole is provided on the outer wall of the spool body at a position corresponding to the bottom hanging ear. The grout discharge hole is connected to the annular guide gap and is used to discharge a small amount of grout that accidentally seeps into the gap to an external collection tank, preventing the grout from accumulating and hardening in the hanging ear area.

4. The lifting-type stringer according to claim 1, characterized in that, The flexible side skirt has at least one annular cavity along its inner circumference, which is connected to the inner cavity of the tremie cylinder body through a radial connecting hole. When concrete falls into the tremie cylinder body, some airflow or grout droplets enter the annular cavity through the radial connecting hole, causing the flexible side skirt to expand radially due to the increased internal pressure. The guide lip at its lower edge then adheres tightly to the outer wall of the adjacent tremie cylinder below, forming a dynamic fit seal. When pouring stops and the internal pressure is released, the flexible side skirt retracts due to its own elasticity, returning to a relaxed state, which is convenient for lifting and disassembly.

5. A construction method for pouring concrete using a lifting tremie pipe, characterized in that, Includes the following steps: S1. Connecting chains are used to connect the lifting drums and the hoppers. S2. As the concrete pouring surface rises, lift one section of the lifting tremie pipe in preparation for dismantling. The specific operation is as follows: S21. After raising it to the height of one section of the lifting drum, connect the conversion chain that was pre-installed on the previous lifting drum to the lug on the top second lifting drum. S22. First, release the connecting chain between the second lifting spool and the first lifting spool, then release the connecting chain between the first lifting spool and the hopper. S23. Remove the first top lifting cylinder; S24. Lift the remaining lifting drum upwards as a whole, connect the second lifting drum to the hopper, and finally hang the conversion chain on the top hanging ear to complete one lifting cycle. S24. Repeat until all concrete pouring work is completed.

6. The construction method for pouring concrete using a lifting tremie pipe according to claim 5, characterized in that, After the shunt connection is completed in step S1, concrete pouring begins. The positive pressure airflow generated in the shunt during the concrete's fall causes the annular cavity in the flexible side skirt to automatically pressurize and expand. The guide lip is pressed tightly against the outer wall of the lower shunt to prevent grout from overflowing. Before removing the top shunt in step S23, pouring is paused for 3–5 seconds. After the pressure inside the shunt is balanced and the flexible side skirt retracts, the chain is released and the shunt is lifted away, ensuring a smooth and unobstructed separation.

7. The construction method for pouring concrete using a lifting tremie pipe according to claim 6, characterized in that, In step S21, after the second top lifting duct is lifted into place, an axial micro-vibration is applied for 0.5–1.5 seconds by the tower crane hook, with a frequency of 2–5Hz and an amplitude of 3–8mm. This causes the lower edge guide lip of the flexible side skirt of the upper duct to automatically slide into the predetermined fitting position above the top hanging lug of the lower duct under the assistance of vibration. At the same time, it promotes the discharge of residual air in the annular cavity, enhancing the sealing fit during subsequent pouring.

8. The construction method for pouring concrete using a lifting tremie pipe according to claim 7, characterized in that, During each pause in pouring to release pressure on the flexible side skirt, the compressed air nozzles installed on the outer wall of the tremie pipe are simultaneously activated to blow a short-term airflow into the annular guide gap between the flexible side skirt and the outer wall of the tremie pipe, sweeping any slurry particles that may be trapped to the slurry discharge hole for discharge.

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