Combined type separation device formed by concrete pouring and separation method

Abstract

The invention discloses a combined separation device and method for concrete pouring forming in the field of beam-column joint construction, the device comprises at least two sets of flexible separation assemblies, each set of assembly comprises a rod body and a combing unit made of an elastic memory high polymer material, and the at least two sets of assemblies are configured to be inserted from different positions of a reinforcement cage; the method comprises the steps that a plurality of sets of assemblies are inserted in a crossed mode, a blocking notch formed by a single set of comb hair due to the fact that the single set of comb hair elastically avoids the reinforcing steel bars is covered through space complementation, and pouring and low-disturbance pulling-out are carried out. The problems that a traditional rigid or one-way blocking device fails in sealing and is difficult to pull out due to interference of reinforcing steel bars are effectively solved, and effective separation and relative lossless construction of beam-column joint concrete interfaces are achieved.

Description

Technical Field

[0001] This invention relates to the field of beam-column joint construction, specifically to a combined separation device and separation method for concrete casting. Background Technology

[0002] In the construction of cast-in-place reinforced concrete structures, beam-column joints (core areas) are critical components for structural stress. According to seismic design codes and engineering practice requirements, in order to ensure the load-bearing capacity of frame columns, the strength grade of column concrete is often significantly higher than that of beam concrete.

[0003] Therefore, when pouring concrete in the beam-column junction area, it is necessary to set up separation measures at the beam-column junction to effectively intercept concrete of different strength grades on both sides, prevent low-strength beam concrete aggregate from flowing randomly into the column core area, and at the same time require that the concrete on both sides can be properly fused at the junction to avoid the formation of cold joints and ensure the integrity of the structure.

[0004] Traditional concrete separation construction typically uses quick-closing mesh or dense wire mesh as permanent barrier facilities. However, this method has significant drawbacks: On the one hand, once the metal mesh is installed, it remains permanently inside the concrete structure, which can easily form a weak layer at the beam-column interface, affecting the seismic performance and durability of the joint. On the other hand, due to the extremely dense arrangement of steel bars at the beam-column joints, and the intersection of multi-directional stirrups and longitudinal bars, the construction of manually cutting and fixing the mesh is difficult and inefficient, and it is difficult to guarantee the sealing effect, which easily leads to the phenomenon of "grout leakage" and causes potential quality problems.

[0005] To address the aforementioned issues, some recyclable barrier devices have emerged in the prior art, such as inflatable airbags or rigid inserts. However, inflatable airbags are easily punctured by the ends of steel bars in confined spaces with dense reinforcement, rendering them ineffective. Furthermore, since the airbags block concrete by expanding and occupying space, they are relatively large, leaving a significant cavity at the beam-column interface after being pulled out. Without secondary grouting, this would severely weaken the cross-sectional strength, and secondary treatment is extremely difficult.

[0006] Rigid insert plates, on the other hand, cannot avoid the horizontally intersecting reinforcing bars and therefore cannot be inserted into the complex reinforcing cage.

[0007] Currently, the industry is beginning to experiment with using wire bundles or steel brushes as flexible barrier tools, utilizing the gaps in the brush bristles to accommodate the reinforcing bars. However, significant drawbacks remain: First, when the metal brush bristles encounter the steel bar during insertion, they undergo plastic bending deformation and are difficult to automatically spring back to their original position, causing the gap behind the steel bar to fail to close, thus forming a grout leakage channel. Secondly, existing devices mostly adopt a unidirectional insertion mode. When the brush bristles encounter the reinforcing bar and make way, a "V"-shaped shadow gap will inevitably be formed on the back surface of the reinforcing bar, and the aggregate in the concrete slurry on both sides will leak from the gap to the other side. Finally, the metal bristles have a high coefficient of friction and are prone to entanglement or hooking with the stirrups after being compressed, making it extremely difficult to pull them out after pouring. Forcibly pulling them out often brings out a large amount of aggregate, thereby damaging the structural integrity of the concrete interface. Summary of the Invention

[0008] The purpose of this invention is to provide a combined separating device and method for concrete casting, in order to solve the technical problems of existing metal barrier devices, such as difficulty in inserting the reinforcing cage, difficulty in forming an effective separation interface, and damage to the integrity of the concrete separation interface due to the snagging of the reinforcing bars when pulling out.

[0009] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A concrete-cast modular partition device includes at least two sets of flexible barrier components, each set of flexible barrier components including a rod and a comb unit fixed on the rod. The combing unit contains several combs that are closely arranged along the length of the rod. The combs are made of a polymer material with elastic memory function. Among them, at least two sets of flexible barrier components are configured to be inserted into the interior from different positions of the crossbeam reinforcement cage, and after each set of flexible barrier components is inserted into place, the combs of different sets are adjacent to or overlap each other in space to form a multi-layered staggered composite barrier surface for separating concrete slurries of different strengths.

[0010] Furthermore, there are two sets of flexible barrier components. The two sets of flexible barrier components are configured to be inserted obliquely into the steel cage from the upper sides or the two apex corners of the steel cage cross section, so that the combs of the two sets of flexible barrier components form an oblique cross inside the steel cage, and the overlapping area of ​​the cross section of the two sets of combs covers the central area of ​​the steel cage cross section.

[0011] Furthermore, the combined partition device also includes a third set of flexible barrier components, which are configured to be inserted downward into the rectangular cross-section of the beam reinforcement cage from above, so that the bristles of the third set of flexible barrier components are inserted downward between the bristles of the first two sets of flexible barrier components, and the bristles extend downward.

[0012] Furthermore, the composite blocking surface is set at an angle, and it is set at an angle to the vertical direction.

[0013] Furthermore, the comb has a flat cross-section, and the width of the comb forms an angle of 40° to 50° with the length of the bar.

[0014] Furthermore, the comb is constructed with a variable cross-section structure with alternating widths along its length; The comb includes several flat blocking parts spaced apart along the length direction and a flexible connecting part connecting two adjacent flat blocking parts. The cross-sectional area of ​​the flexible connection part is smaller than that of the flat blocking part, and the perimeter of the cross-section of the flexible connection part is circular, elliptical or chamfered rectangle. The flat blocking part and the flexible connection part are connected by a smooth concave arc surface or a streamlined slope. The concave arc surface or streamlined slope is configured to provide a release guide for the reinforcing bar that is stuck in the flexible connection part when the flexible blocking component is pulled out.

[0015] Furthermore, a guide end is formed at the end of the comb fur away from the barb, and the guide end is tapered in the thickness or width direction to form a wedge-shaped guide surface or a V-shaped guide angle.

[0016] A method for creating a partition using cast concrete, comprising a flexible barrier component, the method including the following steps: S1. Preparation phase: Provide at least two sets of flexible barrier components; S2. Cross-insertion to construct barrier layer: At least two sets of flexible barrier components are inserted into the interior from different positions of the crossbeam reinforcement cage; During this process, different groups of combs intersect or overlap in space to cover each other and compensate for the blocking gaps formed by the elastic avoidance of the steel bars by a single group of combs, so as to construct a composite blocking surface. S3. Concrete pouring: High-strength concrete and low-strength concrete are poured on both sides of the composite barrier surface respectively; S4. Low-disturbance pull-out: Before the concrete is poured and reaches the initial setting state, pull the flexible barrier component out of the steel cage. During the extraction process, the properties of the high-molecular elastic material of the comb are utilized to cause the comb to undergo elastic deformation so as to detach from the steel cage, thereby reducing disturbance to the concrete interface.

[0017] Furthermore, the combined partition device includes a third set of flexible barrier components; Following step S2, the following is also included: Step S2-1. Vertical insertion to construct the filling layer: Insert the third set of flexible barrier components downward from the middle of the upper surface of the beam reinforcement cage between the first two sets of flexible barrier components; During this process, the third set of combs is used to insert downwards and fill the gaps between the first two sets of combs.

[0018] Furthermore, the comb has a variable cross-section structure with alternating wide and narrow sections and a smooth transition surface; In step S4, the pulling process specifically includes: using the variable cross-section structure and smooth transition surface of the comb to convert the axial tensile force into a lateral component force, guiding the comb to slide off the stuck steel bar.

[0019] The beneficial effects of this invention are: This invention employs at least two sets of flexible barrier components made of elastic memory polymer materials. By inserting them from different positions in the reinforcing cage and forming multiple layers of overlapping in space, a composite barrier system with adaptive compensation capability is constructed. This system utilizes the complementary effect of different sets of combs in spatial distribution, with the solid part of one set of combs effectively covering the "projected gap" formed by the other set of combs avoiding the reinforcing bars. This overcomes the problem of grout leakage blind spots that inevitably exist in traditional unidirectional insertion devices due to the obstruction of reinforcing bars, and achieves effective interception of concrete aggregates of different strengths. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the planar structure of the flexible barrier component according to an embodiment of the present invention; Figure 2 This is a bottom view of the flexible barrier component according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a brush bristle structure with a flexible connecting portion according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the flexible barrier component of the present invention forming a composite barrier surface in a steel cage. The labels in the figure represent the following: 1-rod; 2-comb; 2a-flat blocking part; 2b-flexible connection part; 2c-concave arc surface; 2d-V-shaped guide angle; 3-steel cage; 4-composite blocking surface. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This embodiment provides a combined separation device formed by concrete casting, which aims to solve the technical problems of existing metal barrier devices, such as difficulty in insertion when inserting the reinforcing cage 3, difficulty in forming an effective separation interface, and damage to the integrity of the concrete separation interface due to the snagging of the reinforcing bars when pulling out.

[0024] For details, see Figures 1 to 4 This combined partition device includes at least two sets of flexible barrier components. Each set of flexible barrier components includes a rod 1 and a combing unit fixed on the rod 1. The combing unit includes several combs 2 arranged closely along the length of the rod 1. The combs 2 are made of polymer materials with elastic memory function (such as thermoplastic polyurethane TPU, modified nylon, etc.).

[0025] In practical applications, traditional single-row rigid barrier devices can only form a single-dimensional blocking surface when inserted into complex steel cages 3. Once they encounter steel reinforcement, the rigid material undergoes irreversible bending, causing the gaps behind the steel reinforcement to fail to close.

[0026] To address this fundamental issue, at least two sets of flexible barrier components in this embodiment are configured to be inserted into the interior from different positions of the crossbeam reinforcement cage 3. Once each set of flexible barrier components is inserted into place, the elastic recovery characteristics of the polymer material are utilized, and the different sets of combs 2 are spatially adjacent or overlapping, thereby forming a multi-layered, staggered composite barrier surface used to separate concrete slurries of different strengths.

[0027] This multi-layered staggered structure no longer relies on the limited blocking effect of a single barrier, but effectively blocks aggregate from passing through through the spatial masking of multiple layers of comb 2, while allowing cement paste to penetrate and fuse within a controlled range.

[0028] In order to balance the flexibility of the barrier component in complex steel cages and its ability to effectively intercept concrete aggregates, the hardness of the comb material was optimized in this embodiment.

[0029] Specifically, the comb bristles are made of thermoplastic polyurethane elastomer (TPU) or modified nylon, with a Shore hardness range of 45D to 65D. Within this hardness range, the comb bristles exhibit excellent 'semi-rigid' characteristics: when subjected to strong compression from the steel bars in the steel cage, the comb bristles have sufficient flexibility to produce large-angle elastic avoidance deformation, thus preventing the device from being unable to be inserted. After the avoidance action is completed or during the concrete pouring process, the comb of this hardness has sufficient restoring force (stiffness) and bending stiffness. Combined with the support provided by the interlocking structure of the composite blocking surface, it can resist the lateral hydraulic pressure of the concrete slurry and the impact force of the coarse aggregate, preventing the comb from collapsing under pressure and causing the blocking to fail.

[0030] To accommodate the aforementioned hardness range, the thickness of the comb bristles is preferably between 1.5 mm and 3.0 mm. This combination of thickness and hardness allows the comb bristles to form a thin sheet-like structure that can cut into the gaps between reinforcing bars, while also ensuring structural stability under the lateral pressure of concrete.

[0031] Based on the above basic structure, if the two sets of components are inserted in parallel, although the thickness is increased, there may still be overlap for the steel reinforcement avoidance gaps in a specific direction, which may lead to the risk of grout leakage (mainly aggregate). In order to further optimize the blocking effect, this embodiment improves the spatial arrangement of the flexible barrier components.

[0032] Specifically, the number of flexible barrier components is set to two sets. These two sets of flexible barrier components are configured to be inserted obliquely into the steel cage 3 from the upper sides or the two apex corners of the cross section of the steel cage 3, so that the combs 2 of the two sets of flexible barrier components form an oblique intersection inside the steel cage 3, and the overlapping area of ​​the intersection of the two sets of combs 2 covers the central area of ​​the cross section of the steel cage 3.

[0033] It should be noted that, considering that the comb 2 is made of flexible polymer material, when the cross-section of the beam is large (long span), due to its own weight and the obstruction of the reinforcing steel, the comb 2 may exhibit a slight droop or a non-linear state under pressure bending in its actual extended state. The "oblique insertion" or "cross distribution" described in this embodiment refers to the overall extension trend of the comb 2 pointing to the opposite side and below the cross-section, so that the two sets of comb 2 form an effective spatial overlap and complementarity in the central core area of ​​the reinforcing cage, and should not be narrowly interpreted as an absolute straight diagonal in a mathematical sense. This flexible spatial adaptability is precisely the advantage of this invention compared to rigid inserts.

[0034] This diagonal arrangement utilizes the principle of geometric complementarity. The gap created by one set of combs 2 avoiding the steel bars can be covered by another set of combs 2 inserted at different angles. This effectively reduces the area of ​​the gap, thereby greatly reducing the probability of penetrating holes.

[0035] In some super high-rise building beam-column joints with extremely dense steel reinforcement, relying solely on two sets of diagonally inserted components may still result in localized weak points in the sealing, such as in the central area of ​​the rectangular cross-section or in the gaps between the top-level steel reinforcement.

[0036] In response to this situation, the combined partition device of this embodiment also includes a third set of flexible barrier components. The third set of flexible barrier components is configured to be inserted downward into the rectangular cross section of the beam reinforcement cage 3 from above, such that the comb 2 of the third set of flexible barrier components is inserted downward between the comb 2 of the first two sets of flexible barrier components, and the extension direction of the comb 2 is downward.

[0037] The third set of components acts as a "wedge" or "reinforcing layer," filling any remaining central gaps in the first two sets of cross structures and creating a denser three-dimensional barrier network.

[0038] Furthermore, considering engineering mechanics requirements, if the concrete cold joint or interface of the beam-column joint is a vertical plane, it is prone to shear slip risk. In engineering practice, it is generally recommended that the interface have a certain inclination angle (such as 45°). Therefore, the composite blocking surface in this embodiment is set in an inclined state, and it is set at an angle with the vertical direction. In specific construction, this angle is usually set between 30° and 60°, preferably 45°, but the actual angle can be finely adjusted according to the distribution of the steel bars in the steel cage 3 on site to adapt to the gaps between the steel bars.

[0039] At the microstructural level, if the comb 2 adopts a circular cross section, there is an inherent gap between the point contacts when multiple comb 2 are arranged side by side. If a simple flat cross section is adopted and arranged perpendicular to the rod 1, the flat surface is easy to flip and open a gap when the comb 2 is bent under pressure.

[0040] To address the microscopic sealing issue, the comb 2 in this embodiment is designed with a flat cross-section, and the width direction of the comb 2 forms an angle of 40° to 50° with the length direction of the rod 1. This oblique flat design allows the comb 2 to form a layered structure similar to venetian blinds when arranged. Even when the comb 2 is bent and deformed, adjacent comb 2 can still maintain sheet-like overlap, thereby significantly improving the interception ability of fine aggregates.

[0041] Furthermore, although the flat shape is beneficial for blocking aggregates in the concrete slurry, in the actual process of inserting the steel cage 3, the flat comb 2 with a uniform cross section throughout has a significant problem of "path deviation accumulation". Since the flat comb 2 has high bending stiffness in the width direction, once the comb 2 makes lateral contact with the steel bar in the initial stage of insertion and tilts to avoid it, this lateral tilt will often be rigidly transmitted along the length of the comb 2, causing the entire comb 2 to tilt in a straight line, which is very easy to deviate significantly from the predetermined blocking plane.

[0042] To alleviate this insertion guidance problem, this embodiment has made a special design to the longitudinal shape of the comb 2: the comb 2 is constructed as a variable cross-section structure with alternating widths in the length direction. Specifically, the comb 2 includes several flat blocking parts 2a distributed at intervals along the length direction and flexible connecting parts 2b connecting two adjacent flat blocking parts 2a. The cross-sectional area of ​​the flexible connecting part 2b is smaller than the cross-sectional area of ​​the flat blocking part 2a, and the periphery of the cross-section of the flexible connecting part 2b is processed into a circle, an ellipse or a chamfered rectangle.

[0043] The flexible connection 2b constitutes a "flexible hinge" in terms of mechanical mechanism. When the upper flat blocking part 2a is obstructed by the steel bar and tilts or twists laterally, the flexible connection 2b with a smaller cross section can absorb most of the torsional moment through its own local deformation, thereby effectively blocking the rigid transmission of the eccentric stress to the lower flat blocking part 2a.

[0044] This "decoupling" effect allows the flat blocking part 2a located below to greatly reduce the influence of the contact posture above, avoiding the overall large-scale displacement of the entire comb 2 due to local obstruction. Compared with the traditional straight comb 2 with equal cross-section, this structure can make the lower end of the comb 2 always maintain a better downward gap-finding tendency, thereby improving the success rate of the device penetrating the bottom of the steel cage 3 and the verticality of the blocking surface.

[0045] Meanwhile, the flat blocking part 2a and the flexible connecting part 2b are connected by a smooth concave arc surface 2c or a streamlined slope. When the flexible blocking component is pulled out, the concave arc surface 2c or the streamlined slope is configured to guide the steel bar that is stuck in the flexible connecting part 2b to release.

[0046] This structure decomposes the vertically upward pull-out force into a horizontal component, forcing the comb 2 to make lateral elastic avoidance, thereby allowing the steel bar to be smoothly released and avoiding hard pulling.

[0047] To further address the issue of the comb 2 becoming stuck or bending due to its end contacting the reinforcing bar during insertion, in this embodiment, the end of the comb 2 furthest from the rod 1 is formed with a guide end. This guide end is tapered in the thickness or width direction to form a wedge-shaped guide surface or a V-shaped guide angle 2d. This guide structure gives the comb 2 the ability to "find gaps," allowing it to automatically slide into the gap on one side of the reinforcing bar when it comes into contact with it, thus improving insertion efficiency.

[0048] Based on the above-described device, this embodiment also provides a method for separating concrete by casting, the method comprising the following steps: S1. Preparation phase: Provide at least two sets of flexible barrier components.

[0049] S2. Cross-insertion to construct a barrier layer: At least two sets of flexible barrier components are inserted into the beam reinforcement cage 3 from different positions. During this process, the different sets of combs 2 cross or overlap in space. The core purpose is to use the spatial relationship of the cross to cover each other and make up for the blocking gaps formed by the elastic avoidance of the steel bars by a single set of combs 2, thereby constructing a composite barrier surface.

[0050] Regarding the aforementioned case involving a third set of components, after step S2, step S2-1 is also included: vertical insertion to construct the filling layer. That is, the third set of flexible barrier components is inserted downwards from the middle of the upper surface of the beam reinforcement cage 3 between the first two sets of flexible barrier components. During this process, the third set of combs 2 is used to penetrate downwards and fill the gaps between the first two sets of combs 2, further improving the density of the barrier surface.

[0051] S3. Concrete pouring: High-strength concrete and low-strength concrete are poured on both sides of the composite barrier surface respectively.

[0052] S4. Low-Disturbance Pull-Out: Before the concrete is poured and reaches its initial setting state, the flexible barrier component is pulled out of the reinforcing cage 3. During the pull-out process, the high-molecular elastic material properties of the comb 2 are utilized to cause the comb 2 to undergo elastic deformation to detach from the reinforcing cage 3, reducing disturbance to the concrete interface. Specifically, for the implementation method using the variable cross-section comb 2, the pull-out process includes: utilizing the variable cross-section structure and smooth transition surface of the comb 2 to convert the axial tensile force into a lateral component force, guiding the comb 2 to slide off the stuck reinforcing steel, thereby achieving a low-resistance, low-damage recycling operation.

[0053] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A modular barrier formed by casting concrete, characterised in that, The flexible barrier assembly includes at least two groups of flexible barrier assemblies, each group of the flexible barrier assembly including a rod body (1) and a comb unit fixed on the rod body (1); The comb unit includes a plurality of combs (2) closely arranged along the length direction of the rod body (1), and the combs (2) are made of a high polymer material with elastic memory function; At least two groups of the flexible barrier assembly are configured to be inserted into the interior from different positions of the beam reinforcement cage (3), and after each group of the flexible barrier assembly is inserted into position, the combs (2) of different groups are closely adjacent or overlapped in space to form a composite barrier surface in a multi-layer staggered form for separating concrete slurries of different strengths.

2. A modular barrier formed from cast concrete according to claim 1, wherein, The number of the flexible barrier assemblies is two, and the two groups of the flexible barrier assembly are configured to be inserted into the reinforcement cage (3) from the top of the two sides or the two top corners of the cross section of the reinforcement cage (3) respectively, so that the combs (2) of the two groups of the flexible barrier assembly form a diagonal cross in the interior of the reinforcement cage (3), and the overlapping area of the combs (2) of the two groups covers the central area of the cross section of the reinforcement cage (3).

3. A modular barrier formed from cast concrete according to claim 2, wherein, The combined separation device further includes a third group of the flexible barrier assembly, and the third group of the flexible barrier assembly is configured to be inserted into the beam reinforcement cage (3) from the top to the bottom of the rectangular cross section of the beam reinforcement cage (3), so that the combs (2) of the third group of the flexible barrier assembly are inserted between the combs (2) of the first two groups of the flexible barrier assembly, and the extension direction of the combs (2) is downward.

4. The combination barrier of claim 1, wherein, The composite barrier surface is arranged in an inclined state and forms an angle with the vertical direction.

5. The combination barrier of claim 1, wherein, The comb (2) is a comb (2) with a flat cross section, and the width direction of the comb (2) forms an angle of 40°-50° with the length direction of the rod body (1).

6. A composite barrier formed by casting concrete in accordance with claim 5, wherein The comb (2) is configured as a variable cross section structure with alternating width and narrowness in the length direction; The comb (2) includes a plurality of flat barrier portions (2a) spaced apart along the length direction and flexible connecting portions (2b) connected between adjacent two flat barrier portions (2a); The cross-sectional area of the flexible connecting portion (2b) is smaller than the cross-sectional area of the flat barrier portion (2a), and the cross-sectional periphery of the flexible connecting portion (2b) is circular, elliptical or chamfered rectangular; The flat barrier portion (2a) and the flexible connecting portion (2b) are connected by a smooth concave arc surface (2c) or a streamlined slope, and the concave arc surface (2c) or the streamlined slope is configured to guide the release of the steel bars clamped in the flexible connecting portion (2b) when the flexible barrier assembly is pulled out.

7. A composite barrier formed by casting concrete according to claim 1 or 5, wherein The end of the comb (2) away from the rod body (1) forms a guide end, and the guide end is tapered in the thickness direction or the width direction to form a wedge-shaped guide surface or a V-shaped guide sharp corner (2d).

8. A method of concrete formwork construction comprising a flexible barrier assembly as claimed in any one of claims 1 to 7, characterised in that, The method includes the following steps: S1. Preparation stage: providing at least two groups of the flexible barrier assembly; S2. Cross-insertion construction of barrier layer: inserting the at least two groups of the flexible barrier assembly into the interior from different positions of the beam reinforcement cage (3) respectively; In the process, different groups of the combs (2) form a cross or overlap in space to cover each other with the cross spatial position relationship and make up the blocking gap caused by the elastic avoidance of the steel bars to build the composite blocking surface; S3. Concrete pouring: high-strength concrete and low-strength concrete are poured on both sides of the composite blocking surface; S4. Low disturbance pulling out: the flexible barrier assembly is pulled out from the steel cage (3) before the concrete pouring is completed and reaches the initial setting state; In the pulling-out process, the comb (2) is elastically deformed to separate from the steel cage (3) by using the polymer elastic material characteristics of the comb (2), thereby reducing the disturbance to the concrete interface.

9. A method of forming a partition from cast concrete according to claim 8, wherein, The combined separation device comprises a third group of the flexible barrier assembly; After step S2, further comprising: Step S2-1. Vertical insertion to build a filling layer: the third group of the flexible barrier assembly is inserted downward from the middle of the upper surface of the beam steel cage (3) between the first two groups of the flexible barrier assembly; In this process, the third group of the comb (2) is inserted downward to fill the gap between the first two groups of the comb (2).

10. The method of claim 8, wherein the method further comprises: The comb (2) has a variable cross-section structure with alternating width and narrowness and a smooth transition curved surface; In step S4, the pulling-out process specifically comprises: converting the axial tension into a lateral component force by using the variable cross-section structure of the comb (2) and the smooth transition curved surface, and guiding the comb (2) to slip off from the stuck steel bar.

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