Concrete filled steel tube column pouring construction method

Abstract

The application provides a steel pipe concrete column pouring construction method and belongs to the technical field of concrete pouring. The method comprises the following steps: connecting a pouring gate on a concrete pouring pipe to a side wall at the bottom end of a lower pipe; installing a limiting sleeve at the top end of the lower pipe, inserting and positioning an upper pipe on the limiting sleeve; arranging a partition plate in the inner cavity of the lower pipe and positioning the partition plate below the pouring gate; pouring concrete into the inner cavity of the lower pipe through the pouring gate; when the amount of the concrete in the lower pipe reaches a preset volume, driving the partition plate to move upward until the inner side of the limiting sleeve, and lifting the concrete in the lower pipe to the upper pipe through the partition plate; after the inner cavity of the lower pipe is filled with the concrete, disassembling the limiting sleeve, positioning the partition plate and paving a subsequent surface layer by means of the partition plate. The steel pipe concrete column pouring construction method is convenient to operate, has high construction efficiency and low operation difficulty.

Description

Technical Field

[0001] This invention belongs to the field of concrete pouring technology, and more specifically, relates to a construction method for pouring concrete-filled steel pipe columns. Background Technology

[0002] Currently, most super high-rise buildings adopt a steel-concrete hybrid structure, with the building's outer frame consisting of steel-concrete composite columns, into which concrete is poured. Existing technologies employ two methods for pouring concrete within the steel-concrete composite columns: one uses a tower crane bucket or concrete placing boom, and the other uses a jacking method. The tower crane bucket method, however, requires significant time commitment from tower crane operations and is therefore inefficient.

[0003] When using the jacking method for high-rise construction, the pressure increases continuously as the concrete is lifted, making the selection of the required jacking power extremely difficult. Furthermore, if the jacking operation is interrupted, cold joints will appear in the concrete, preventing further upward jacking. In the event of quality issues such as concrete voids, check valves must be installed. These problems indicate that existing concrete pouring methods are inefficient and difficult to operate. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for pouring concrete into steel pipe columns, which aims to solve the problems of low construction efficiency and high operational difficulty when pouring concrete into steel pipes.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a method for pouring concrete-filled steel tube columns, comprising:

[0006] Connect the pouring port on the concrete pouring pipe to the side wall at the bottom of the lower pipe;

[0007] A limiting sleeve is installed at the top of the lower tube, and the upper tube is inserted into and positioned on the limiting sleeve;

[0008] A baffle is placed inside the lower tube cavity and positioned below the gate;

[0009] Concrete is injected into the lower pipe cavity through the pouring gate. When the amount of concrete in the lower pipe reaches the preset volume, the partition is driven to move upward until it reaches the inside of the limiting sleeve. The concrete in the lower pipe is lifted into the upper pipe through the partition.

[0010] After the inner cavity of the lower pipe is filled with concrete, the lower limiting sleeve is removed, the partition is positioned, and the subsequent surface layer is laid with the help of the partition.

[0011] In one possible implementation, the method further includes, before connecting the pouring port on the concrete pouring pipe to the side wall at the bottom end of the lower pipe:

[0012] Position the lower pipe at the appropriate location in the construction area and attach the traction rope to the partition.

[0013] In one possible implementation, connecting the pouring port on the concrete pouring pipe to the side wall at the bottom end of the lower pipe includes:

[0014] A pouring port is provided on the side wall of the lower pipe; a clamp is installed on the pouring port;

[0015] The gate is installed and positioned on the card.

[0016] In one possible implementation, inserting and positioning the upper tube on the limiting sleeve includes:

[0017] The upper tube is coaxially positioned above the lower tube, and the upper tube and the lower tube are spaced a certain distance apart according to the thickness of the partition.

[0018] In one possible implementation, the limiting sleeve includes two oppositely arranged connecting petals, the ends of which are spliced ​​together to form a ring structure; the connecting petals are provided with two slots, which are respectively inserted into and engaged with the lower tube and the upper tube.

[0019] In one possible implementation, the step of placing the baffle in the inner cavity of the lower tube and positioning the baffle below the gate includes:

[0020] The traction rope is threaded through the inside of the lower pipe and the upper pipe, and the partition is positioned below the gate by the traction rope.

[0021] In one possible implementation, the step of driving the partition plate upward until it reaches the inner side of the limiting sleeve when the amount of concrete in the lower pipe reaches a preset volume includes:

[0022] When the concrete in the lower pipe can fill the inner cavity of the upper pipe, the traction rope drives the partition to move upward, and the partition pushes the concrete above into the upper pipe.

[0023] The pouring gate continues to inject concrete into the lower pipe until the inner cavity of the lower pipe is filled.

[0024] In one possible implementation, a plurality of reinforcing rods are fixed to the top and bottom surfaces of the partition, the reinforcing rods being inserted into the concrete.

[0025] In one possible implementation, removing the lower limiting sleeve after the inner cavity of the lower pipe is filled with concrete includes:

[0026] The partition is positioned inside the limiting sleeve, and the partition is capable of sealing the gap between the lower tube and the upper tube.

[0027] In one possible implementation, positioning the partition and using the partition to lay the subsequent surface layer includes:

[0028] Multiple connecting rods are fixed on the partition, a support ring is installed and fixed on the connecting ring, and a floor or other supporting material is placed on the support ring.

[0029] The beneficial effects of the steel-concrete composite column casting construction method provided by this invention are as follows: Compared with the prior art, in this invention, the casting port is first connected to the side wall of the lower pipe, then a limiting sleeve is installed at the top of the lower pipe, the upper pipe is inserted and positioned on the lower pipe, and a partition is placed in the inner cavity of the lower pipe, with the partition positioned below the casting port. Concrete is injected into the inner cavity of the lower pipe through the casting port. When the amount of concrete in the lower pipe reaches a preset volume, the partition is driven to move upward until it reaches the inner side of the limiting sleeve, and the concrete in the lower pipe is lifted into the upper pipe through the partition. After the inner cavity of the lower pipe is filled with concrete, the lower limiting sleeve is removed, the partition is positioned, and the subsequent surface layer is laid with the help of the partition.

[0030] In this application, by lifting the diaphragm and continuously pouring concrete, both the lower and upper pipes are eventually filled with concrete. The whole process is easy to operate, has high construction efficiency, and is relatively easy to operate. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A flowchart of a steel-concrete composite column casting construction method provided in an embodiment of the present invention;

[0033] Figure 2 This is a structural schematic diagram of the steel-concrete composite column casting construction method provided in an embodiment of the present invention.

[0034] In the diagram: 1. Lower pipe; 2. Upper pipe; 3. Baffle; 4. Limiting sleeve; 5. Traction rope; 6. Pouring pipe. Detailed Implementation

[0035] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0036] Please see Figure 1 and Figure 2 The present invention will now describe the construction method for casting steel-concrete composite columns. The construction method for casting steel-concrete composite columns includes:

[0037] The pouring port on the concrete pouring pipe 6 is connected to the side wall at the bottom end of the lower pipe 1.

[0038] Install a limiting sleeve 4 at the top of the lower tube 1, and insert and position the upper tube 2 on the limiting sleeve 4.

[0039] The baffle 3 is placed inside the lower tube 1 and positioned below the gate.

[0040] Concrete is injected into the inner cavity of the lower pipe 1 through the pouring gate. When the amount of concrete in the lower pipe 1 reaches the preset volume, the baffle 3 is driven to move upward until it reaches the inner side of the limiting sleeve 4. The concrete in the lower pipe 1 is lifted into the upper pipe 2 through the baffle 3.

[0041] After the inner cavity of the lower pipe 1 is filled with concrete, the lower limit sleeve 4 is removed, the partition 3 is positioned, and the subsequent surface layer is laid with the help of the partition 3.

[0042] The beneficial effects of the steel-concrete composite column casting construction method provided by this invention are as follows: Compared with the prior art, in this invention, the casting port is first connected to the side wall of the lower pipe 1, then a limiting sleeve 4 is installed at the top of the lower pipe 1, the upper pipe 2 is inserted and positioned on the lower pipe 1, and a partition 3 is placed in the inner cavity of the lower pipe 1, with the partition 3 positioned below the casting port. Concrete is injected into the inner cavity of the lower pipe 1 through the casting port. When the amount of concrete in the lower pipe 1 reaches the preset volume, the partition 3 is driven to move upward until it reaches the inner side of the limiting sleeve 4, thereby lifting the concrete in the lower pipe 1 into the upper pipe 2 through the partition 3. After the inner cavity of the lower pipe 1 is filled with concrete, the lower limiting sleeve 4 is removed, the partition 3 is positioned, and the subsequent surface layer is laid with the help of the partition 3.

[0043] In this application, by lifting the partition 3 and continuously pouring concrete, both the lower pipe 1 and the upper pipe 2 are eventually filled with concrete. The whole process is easy to operate, has high construction efficiency, and low operation difficulty.

[0044] Using a hydraulic concrete placing boom for pouring concrete involves lengthy installation times due to the layered hoisting process, limited operating space, and significant construction safety hazards. Furthermore, when using tower cranes or placing booms, the delayed structural floor installation necessitates the erection of a pouring platform at high altitudes for concrete pouring within the steel pipe columns, resulting in high-altitude work safety risks. Moreover, the upper section of the steel pipe column can only be hoisted after the concrete of the lower section is poured, further delaying the structural construction schedule. When using the jacking method, especially in high-rise construction, the pressure increases continuously as the concrete is jacked upwards, making the selection of the required jacking power extremely difficult. Additionally, any interruption in the jacking operation can lead to cold joints in the concrete, preventing further jacking. Quality issues such as concrete voids require the installation of check valves. After each jacking operation, the jacking equipment and check valves must be removed only after the concrete has reached its final strength grade, placing high demands on the equipment.

[0045] Concrete-filled steel tube (CFST) structures are structures formed by filling concrete within steel tubes. The presence of the steel tubes effectively confines the core concrete, significantly improving its compressive strength and deformation capacity. Simultaneously, the concrete effectively prevents local buckling of the steel tubes. Together, these two elements fully utilize the high tensile strength of steel and the good compressive strength of concrete, thereby greatly enhancing load-bearing capacity. CFST structures are widely used due to their numerous advantages, including high load-bearing capacity, light weight, good plasticity and toughness, good seismic performance, fatigue resistance, impact resistance, and convenient and environmentally friendly construction.

[0046] The steel frame system, mainly composed of rectangular steel tube concrete columns and steel beams, is an emerging structural form. Due to its many advantages, such as high load-bearing capacity, flexible layout, simple structure, easy standardization of components, fast construction speed and low cost, it has become one of the preferred structural forms for high-rise buildings and has received high attention from the engineering field at home and abroad.

[0047] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 Before connecting the pouring port on the concrete pouring pipe 6 to the side wall at the bottom end of the lower pipe 1, the following steps are also included:

[0048] Position the lower pipe 1 at the corresponding location in the construction area and attach the traction rope 5 to the partition 3.

[0049] In practical applications, steel pipes are all installed and positioned vertically, meaning that lower pipe 1 and upper pipe 2 need to be coaxially set. In order to facilitate positioning, flange-like structures are set at the ends of lower pipe 1 and upper pipe 2. By connecting the flanges of upper pipe 2 and lower pipe 1, the stability of their positions is finally achieved.

[0050] When constructing steel-concrete composite columns, one existing method involves hoisting the concrete, pouring it into a bucket, and then using a crane to lift the bucket to a designated height for pouring. However, this method has low construction efficiency. Another method is jacking, where the concrete needs to be continuously pushed upwards. While this method has higher construction efficiency, it is more difficult to operate and poses certain safety hazards. Based on these technical characteristics, there is a need to propose a concrete pouring method that is easy to construct and has higher efficiency.

[0051] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 Connecting the pouring port on the concrete pouring pipe 6 to the side wall at the bottom end of the lower pipe 1 includes:

[0052] A pouring port is opened on the side wall of the lower pipe 1; a clamp is installed on the pouring port.

[0053] Install and position the gate on the clip.

[0054] It should be noted that both the lower pipe 1 and the upper pipe 2 have internal cavities. The traditional method is to first position both the lower pipe 1 and the upper pipe 2, and then connect the internal cavities between the two pipes to complete the concrete pouring. However, as the height increases, the construction difficulty also increases.

[0055] During jacking construction, a sealing plate needs to be installed at the bottom end of the lower pipe 1 to seal the bottom end. A pouring port is provided on the sealing plate. In practical applications, the pouring port on the concrete mixer truck is connected to the pouring port to achieve concrete jacking and pouring. This application differs from jacking in that the lower pipe 1 is first positioned. After positioning, the bottom end of the lower pipe 1 is sealed. One method is to make a hole at the bottom end of the lower pipe 1 and then connect it to the pouring port. However, this method involves many steps and is inconvenient to operate. The latest embodiment involves opening a connecting hole at the corresponding position at the end of the pipe after factory processing, and installing a clamp on the connecting hole. The clamp is detachably connected to the pipe and engages with the pouring port. After the concrete has cured, the clamp is removed and the connecting hole is welded shut, thus completing the concrete pouring.

[0056] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 The insertion and positioning of the upper tube 2 on the limiting sleeve 4 includes:

[0057] The upper tube 2 is coaxially positioned above the lower tube 1, and the upper tube 2 and the lower tube 1 are spaced a certain distance apart according to the thickness of the partition 3.

[0058] In this application, the lower pipe 1 needs to be positioned first. Only after the lower pipe 1 is positioned can the subsequent partition 3 be installed. However, the upper pipe 2 needs to be positioned before the partition 3 is installed and positioned. If the upper pipe 2 is positioned later, the traction rope 5 that pulls the partition 3 will not easily pass through the lower pipe 1.

[0059] For the reasons mentioned above, it is necessary to position the upper pipe 2. However, this application requires ensuring a tight seal between the lower pipe 1 and the upper pipe 2, as this is the only way to prevent concrete from overflowing from the gap between them. Therefore, when positioning the upper pipe 2, a limiting sleeve 4 is first installed at the top of the lower pipe 1. After the limiting sleeve 4 is installed, the upper pipe 2 is then secured to it. The upper pipe 2 can be positioned using other auxiliary positioning tools, ultimately completing the connection between the inner cavities of the lower pipe 1 and the upper pipe 2.

[0060] In some embodiments of the steel-concrete composite column casting construction method provided in this application, the limiting sleeve 4 includes two oppositely arranged connecting petals, the ends of which are spliced ​​together to form a ring structure; the connecting petals are provided with two slots, which are respectively inserted into the lower pipe 1 and the upper pipe 2. To explain in more detail, the limiting sleeve 4 firstly needs to be detachably connected to the lower pipe 1 and the upper pipe 2. For this purpose, the limiting sleeve 4 consists of two parts. The limiting sleeve 4 includes two connecting petals, one end of which is hinged to each other, and the other end is far apart from each other and connected by bolts. The two connecting petals are oppositely arranged and can form a ring structure.

[0061] Two slots are provided on the inner sides of the two connecting segments, arranged vertically. After the two connecting segments are connected, the two slots on the two connecting segments are used to insert and engage with the lower tube 1 and the upper tube 2, respectively. Therefore, after the entire limiting sleeve 4 is installed on the lower tube 1, the upper tube 2 can be inserted into the limiting sleeve 4 for initial positioning.

[0062] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 The method of placing the baffle 3 inside the lower pipe 1 and positioning the baffle 3 below the gate includes:

[0063] The traction rope 5 is threaded through the inside of the lower pipe 1 and the upper pipe 2, and the partition 3 is positioned below the gate by the traction rope 5.

[0064] After the lower tube 1 is positioned and connected to the gate, a baffle 3 needs to be placed inside the lower tube 1. In practical applications, at least two traction ropes 5 need to be installed on the baffle 3. The two traction ropes 5 are attached to different positions on the baffle 3. Through the cooperation of the two traction ropes 5, the baffle 3 can move upward in a near-horizontal state.

[0065] Before pouring begins, the diaphragm 3 must be positioned inside the lower pipe 1 and below the pouring gate. Only with this design will the concrete poured into the lower pipe 1 remain on the diaphragm 3, and as the diaphragm 3 moves upward, it will also move the concrete above it. To achieve the above technical effect, after the upper pipe 2 is positioned, the traction rope 5 must pass through the upper pipe 2 and the lower pipe 1, and be wound up using a winch or similar device.

[0066] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 When the amount of concrete in the lower pipe 1 reaches the preset volume, the drive diaphragm 3 moves upward until the inner side of the limiting sleeve 4 is reached, including:

[0067] When the concrete in the lower pipe 1 can fill the inner cavity of the upper pipe 2, the traction rope 5 drives the partition 3 to move upward, and the partition 3 pushes the concrete above into the upper pipe 2.

[0068] Continue pouring concrete into the lower pipe 1 through the pouring gate until the inner cavity of the lower pipe 1 is filled.

[0069] When concrete pouring is required, the lower pipe 1 and upper pipe 2 have already been positioned. The diaphragm 3 needs to be positioned below the pouring gate, and the traction rope 5 is used to ensure the stability of the diaphragm 3. Then, the retarded concrete is poured through the pouring gate. In practical application, it is crucial to ensure the stability of the diaphragm 3. At this point, the outer edge of the diaphragm 3 abuts against the inner wall of the lower pipe 1, preventing concrete from flowing out. This causes the concrete to gradually accumulate inside the lower pipe 1 until it reaches a certain height.

[0070] When the concrete in the lower pipe 1 approaches the upper pipe 2, the traction rope 5 drives the partition 3 to move. The movement of the partition 3 will drive the concrete to move upward, that is, the concrete is lifted into the upper pipe 2. Since the total amount of concrete in the cavity of the lower pipe 1 is small, the resistance when lifting the concrete on the partition 3 is small. At this time, the pouring gate will still inject concrete until the concrete fills the lower pipe 1 again.

[0071] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 Multiple reinforcing rods are fixed to the top and bottom surfaces of the partition plate 3, and these reinforcing rods are inserted into the concrete. In this application, the concrete is ultimately able to fill the lower pipe 1 and the upper pipe 2 by the traction of the traction rope 5. After the concrete in the lower pipe 1 and the upper pipe 2 has solidified, the construction of the steel-concrete composite column can be completed. However, it should be noted that the partition plate 3 is required to drive the movement of the concrete, so no through holes can be made in the partition plate 3. This results in poor connection between the concrete and the partition plate 3 and poor relative stability after the concrete has solidified, which easily leads to a series of problems such as cracks and voids.

[0072] Therefore, reinforcing rods are fixed to both the upper and lower surfaces of partition 3. Multiple reinforcing rods are provided, and they can be welded together or integrally formed onto partition 3. After concrete is poured, the reinforcing rods are inserted into the concrete, thereby improving the stability of the connection between the reinforcing rods and the concrete.

[0073] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 ,

[0074] To explain in more detail, after the concrete is poured to a certain height, the traction rope 5 can be used to move the partition 3. The movement of the partition 3 will lift the concrete from the lower pipe 1 into the upper pipe 2. Finally, the partition 3 will stop inside the limiting sleeve 4. Since the partition 3 can seal the gap between the lower pipe 1 and the upper pipe 2, the limiting sleeve 4 can be removed at this time. After the limiting sleeve 4 is removed, the connecting rod is installed and fixed, and finally the traction rope 5 can be pulled out from the upper pipe 2.

[0075] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 After the inner cavity of the lower pipe 1 is filled with concrete, the lower limit sleeve 4 is removed, including:

[0076] The partition 3 is positioned inside the limiting sleeve 4, and the partition 3 can block the gap between the lower pipe 1 and the upper pipe 2.

[0077] After the pouring is completed, it needs to stand for a period of time. At this time, a third pipe can be installed at the top of the upper pipe 2, and the pouring port is connected to the third pipe to carry out the pouring operation of the third and fourth pipes. Therefore, the method provided in this application can carry out continuous construction of steel pipe concrete.

[0078] In some embodiments of the steel-concrete composite column casting construction method provided in this application, please refer to... Figure 2 Positioning the partition 3 and using it for subsequent surface layer laying includes:

[0079] Multiple connecting rods are fixed on partition 3, a support ring is installed and fixed on the connecting ring, and the floor or other supporting materials are placed on the support ring.

[0080] After the concrete has hardened inside the pipe, the limiting sleeve 4 needs to be removed. Before removal, ensure that the partition 3 is inside the limiting sleeve 4. After removing the limiting sleeve 4, the connecting rod can be installed and fixed on the partition 3. The connecting rod can be directly connected to the connecting hole at the corresponding position on the partition 3, or it can be fixed by welding. After the connecting rod is fixed, support rings and other components are then clamped onto the connecting rod. The final result is that the support rings support and position the floor slab of that level or the floor between levels.

[0081] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for constructing steel-concrete composite columns, characterized in that, include: Connect the pouring port on the concrete pouring pipe to the side wall at the bottom of the lower pipe; A limiting sleeve is installed at the top of the lower tube, and the upper tube is inserted into and positioned on the limiting sleeve; A baffle is placed inside the lower tube cavity and positioned below the gate; Concrete is injected into the lower pipe cavity through the pouring gate. When the amount of concrete in the lower pipe reaches the preset volume, the partition is driven to move upward until it reaches the inside of the limiting sleeve. The concrete in the lower pipe is lifted into the upper pipe through the partition. After the inner cavity of the lower pipe is filled with concrete, the limiting sleeve is removed, the partition is positioned, and the subsequent surface layer is laid with the help of the partition.

2. The construction method for pouring concrete-filled steel tube columns as described in claim 1, characterized in that, The process includes, before connecting the pouring port on the concrete pouring pipe to the side wall at the bottom end of the lower pipe: Position the lower pipe at the appropriate location in the construction area and attach the traction rope to the partition.

3. The construction method for pouring concrete-filled steel tube columns as described in claim 2, characterized in that, Connecting the pouring port on the concrete pouring pipe to the side wall at the bottom end of the lower pipe includes: A pouring port is provided on the side wall of the lower pipe; a clamp is installed on the pouring port; The gate is installed and positioned on the card.

4. The construction method for pouring concrete-filled steel tube columns as described in claim 1, characterized in that, The process of inserting and positioning the upper tube on the limiting sleeve includes: The upper tube is coaxially positioned above the lower tube, and the upper tube and the lower tube are spaced a certain distance apart according to the thickness of the partition.

5. The construction method for pouring concrete-filled steel tube columns as described in claim 1, characterized in that, The limiting sleeve includes two oppositely arranged connecting petals, the ends of which are spliced ​​together to form a ring structure; the connecting petals are provided with two slots, one of which is inserted into the upper tube and the other is inserted into the lower tube.

6. The construction method for pouring concrete-filled steel tube columns as described in claim 2, characterized in that, The step of placing the baffle in the inner cavity of the lower tube and positioning the baffle below the gate includes: The traction rope is threaded through the inside of the lower pipe and the upper pipe, and the partition is positioned below the gate by the traction rope.

7. The construction method for pouring concrete-filled steel tube columns as described in claim 6, characterized in that, The step of driving the partition plate upward until it reaches the inner side of the limiting sleeve when the amount of concrete in the lower pipe reaches a preset volume includes: When the concrete in the lower pipe can fill the inner cavity of the upper pipe, the traction rope drives the partition to move upward, and the partition pushes the concrete above into the upper pipe. The pouring gate continues to inject concrete into the lower pipe until the inner cavity of the lower pipe is filled.

8. The construction method for casting steel-concrete composite columns as described in claim 1, characterized in that, Multiple reinforcing rods are fixed to the top and bottom surfaces of the partition, and these reinforcing rods are used to insert into the concrete.

9. The construction method for casting steel-concrete composite columns as described in claim 1, characterized in that, The step of removing the limiting sleeve after the inner cavity of the lower pipe is filled with concrete includes: The partition is positioned inside the limiting sleeve, and the partition is capable of sealing the gap between the lower tube and the upper tube.

10. The construction method for pouring concrete-filled steel tube columns as described in claim 9, characterized in that, The step of positioning the partition and using the partition to lay the subsequent surface layer includes: Multiple connecting rods are fixed to the partition, support rings are installed and fixed on the connecting rods, and flooring or other supporting materials are placed on the support rings.

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