Rapid construction method for vertical member horizontal construction joint

Abstract

This invention belongs to the field of building concrete construction, specifically relating to a rapid construction method for horizontal construction joints in vertical structural members. The method includes the following steps: determining the location of the construction joint and completing the reinforcement binding and formwork assembly; installing formwork clips and applying a release agent; pouring concrete and vibrating it to ensure compaction; and obtaining a neat joint surface after demolding. In this method, during the formwork erection stage, formwork clips are fixed to the inside of the formwork at the corresponding location of the construction joint. After pouring concrete and demolding, a smooth and straight joint surface naturally forms at the construction joint, eliminating the need for any subsequent cutting or chiseling.

Description

Technical Field

[0001] This invention belongs to the field of building concrete construction, and specifically relates to a rapid construction method for horizontal construction joints of vertical components. Background Technology

[0002] In the construction of reinforced concrete structures, horizontal construction joints in vertical members (such as shear walls and frame columns) are an unavoidable part of the process. At the junction of upper and lower walls and columns, issues such as root rot and grout leakage are prone to occur, resulting in poor appearance quality after formwork removal. Ensuring the forming quality of shear wall structures, especially the quality of concrete joints, makes the selection of construction methods and processes crucial. The quality of construction joint treatment directly affects the integrity, safety, and durability of the structure, as well as the appearance quality and construction progress of the project.

[0003] Traditional methods for treating construction joints primarily involve marking reference lines and then cutting or roughening the surface. Construction workers must mark reference lines on the poured concrete surface and then use tools such as cutting machines or pneumatic hammers to cut or chisel the construction joint to create a rough joint surface that meets specifications. This process has the following significant problems: Firstly, the process is cumbersome and requires a large amount of manpower. The processes of marking lines, cutting, and roughening are all interconnected and require a lot of manual operation, resulting in low construction efficiency. Moreover, the processes are mutually restrictive, and any delay in any link will affect the overall construction period.

[0004] Secondly, the quality control is poor. The quality of manual cutting and chiseling largely depends on the operator's skill and experience. The flatness and straightness of the joint surface are difficult to guarantee consistently, and problems such as incomplete cutting and uneven chiseling are prone to occur, affecting the bonding quality between new and old concrete.

[0005] Third, the method of pre-embedding wooden strips has inherent defects. Some projects use the method of pre-embedding wooden strips at the construction joints during formwork erection, and then removing the wooden strips after demolding to form the joint surface. However, wooden strips are relatively soft and are easily deformed or even damaged by compression during concrete pouring, resulting in difficulty in removal or irregular joint surface shape. In addition, wooden strips are disposable and cannot be reused, increasing material costs.

[0006] Fourth, the environmental impact is significant. Cutting and chiseling operations generate a large amount of dust and noise pollution, posing a threat to the occupational health of construction workers and failing to meet the current environmental protection requirements of green construction. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a rapid construction method for horizontal construction joints in vertical components, which directly forms a neat and orderly joint surface after the concrete is poured and molded, fundamentally improving the quality of construction joint formation and construction efficiency.

[0008] To achieve this technical objective, the present invention adopts the following solution: A rapid construction method for horizontal construction joints in vertical structural members includes the following steps: Determine the location of horizontal construction joints according to the drawings and process requirements, and complete the binding of vertical structural steel bars and the assembly and placement of formwork. At the corresponding location of the construction joint, a snap-fit ​​strip is fixed along the length of the horizontal construction joint on the inner surface of the template. The thickness of the snap-fit ​​strip is equal to the thickness of the concrete cover of the steel reinforcement. During installation, ensure that the snap-fit ​​strip is straight and firmly snapped tightly to the inner surface of the template to form a flush-cut mold. Concrete is poured using conventional methods and vibrated to ensure it is compacted, thus ensuring that the concrete at the construction joint is fully formed. Once the concrete reaches the conditions for demolding, remove the clamping strips and formwork. The clamping strips will naturally form a neat and regular joint surface at the construction joint.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: By using the technique of pre-embedding snap strips during the formwork stage, a neat and orderly joint surface can be formed directly after the concrete is poured and formed, eliminating the need for marking lines, cutting, and chiseling. This fundamentally improves the quality of construction joint formation and construction efficiency, reduces labor costs, ensures that the construction period is not constrained by the process, and improves the construction working environment.

[0010] As a preferred technical solution: the snap-fit ​​strip has a release agent applied to the side facing the concrete to facilitate the smooth separation of the snap-fit ​​strip from the concrete during demolding.

[0011] As a preferred technical solution: the snap-fit ​​strip consists of an inner wall with a U-shaped cross-section and an outer wall with a U-shaped cross-section. Both the inner and outer walls are made of thin steel plates. The edges of the inner and outer walls are connected by connecting plates. The inner wall is fitted to the surface of the template. There is a gap between the outer wall and the inner wall. The gap width is equal to the thickness of the steel reinforcement protective layer. The metal material can be reused. The hollow structure is lightweight.

[0012] As a preferred technical solution: the spacing between the opening sides of the U-shaped inner wall is less than the thickness of the template, forming a groove with a slope, so that the snap-fit ​​strip is more tightly connected to the template, ensuring that the snap-fit ​​strip does not shift during concrete pouring and vibration.

[0013] As a preferred technical solution: the top surface of the snap-fit ​​strip is welded with a lifting ring for easy disassembly and reuse.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Eliminates the processes of marking lines, cutting, and chiseling, significantly reducing labor input. Traditional construction joint treatment requires multiple steps such as marking lines, cutting, and roughening, resulting in high labor costs and long processing times. This invention, by pre-embedding interlocking strips during the formwork stage, allows for a neat and uniform joint surface directly after concrete molding, eliminating the need for any subsequent processing and significantly improving construction efficiency.

[0015] 2. Stable and reliable joint surface forming quality. Traditional manual cutting and chiseling methods are greatly affected by the operator's skill level, resulting in significant quality fluctuations. This invention uses thin steel plate pre-embedded forming, and the flatness and straightness of the joint surface are guaranteed by the mold precision, ensuring stable and controllable quality. This effectively improves the appearance quality of the construction joint and the structural bonding reliability of the new and old concrete.

[0016] 3. Simple construction operation and strong adaptability. This invention only requires adding a fixing step of the snap-fit ​​strip in the formwork stage. Construction personnel can easily master it and operate it proficiently without additional training. It can be widely used in construction scenarios of horizontal construction joints of various vertical components.

[0017] 4. No cutting dust or noise pollution. This invention completely eliminates cutting and chiseling operations, eliminating the source of dust and noise pollution, significantly improving the construction working environment, and meeting the requirements of green and civilized construction.

[0018] 5. The snap-fit ​​strip is made of thin steel plate, which has higher strength and rigidity than traditional wooden strips. It is not easily deformed or damaged during concrete pouring and vibration, and can be reused many times, which has good economic benefits. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the usage state of the snap-fit ​​strip in the rapid construction method for horizontal construction joints of vertical components according to the present invention.

[0020] Figure 2 This is a schematic diagram of the snap-fit ​​strip in the rapid construction method for horizontal construction joints of vertical components according to the present invention.

[0021] The markings in the diagram are: 1. Connecting strip; 101. Outer wall; 102. Inner wall; 103. Connecting plate; 2. Formwork; 3. Concrete. Detailed Implementation

[0022] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0023] In the construction of high-rise buildings and various concrete structures, horizontal construction joints in vertical components (including shear walls, frame columns, core tube walls, etc.) are an inevitable result of layered concrete pouring. The quality of the joint between the old and new concrete at the construction joint directly affects the overall load-bearing performance and durability of the structure. Traditional construction joint treatment involves manually creating a clean cut at the joint location after the vertical component is poured. This process includes the following steps: first, marking lines on the poured concrete surface to determine the cutting or chiseling area; then, using a cutting machine to cut along the marked lines, or manually chiseling with tools such as pneumatic picks to create a rough joint surface that meets specifications; finally, cleaning away laitance and loose aggregate to prepare for the next concrete pour. This process has several inherent drawbacks: numerous steps lead to high labor costs and low construction efficiency; the quality of manual operation fluctuates greatly, making it difficult to guarantee the flatness and straightness of the joint surface; and the cutting and chiseling operations generate a large amount of dust and noise, adversely affecting the environment and human health.

[0024] In addition, some projects use the method of pre-embedding wooden strips, which involves embedding wooden strips at the construction joints during formwork erection and removing them after demolding to form a joint surface. However, because wooden strips are relatively soft, they are prone to deformation, cracking, or even damage during concrete pouring under lateral pressure and vibration. This results in difficulties in removing the wooden strips after demolding or irregular joint surface shapes. Furthermore, wooden strips are disposable and cannot be reused, leading to significant material waste.

[0025] Based on the shortcomings of the existing technology, this invention proposes a novel technical approach: the forming process of the construction joint surface is moved forward to the concrete 3 pouring stage. By using the pre-embedded snap strip 1 during formwork erection, the concrete 3 forms a regular, flush joint surface at the same time as it is poured, thereby completely eliminating the need for subsequent secondary processing steps such as marking lines, cutting, and chiseling.

[0026] The core technical solution of this invention is to fix a snap-fit ​​strip 1 on the inner surface of the template 2 at the corresponding position of the construction joint during the formwork stage of the horizontal construction joint of the vertical component, so that the snap-fit ​​strip 1 and the template 2 together form a forming mold for the joint surface.

[0027] The snap-fit ​​strip 1 consists of an inner wall 102 with a U-shaped cross-section and an outer wall 101 with a U-shaped cross-section. Both the inner wall 102 and the outer wall 101 are made of thin steel plates. The edges of the inner wall 102 and the outer wall 101 are connected by a connecting plate 103. The inner wall 102 is fitted to the surface of the template 2. There is a gap between the outer wall 101 and the inner wall 102. The gap width is equal to the thickness of the steel reinforcement protective layer.

[0028] Using thin steel plates results in low manufacturing costs, allows for multiple reuses, and reduces the overall weight of the components. Thickness design is also a crucial technical consideration. Specifically, if the thickness of the interlocking strip 1 is less than the thickness of the reinforcing steel cover, the protective layer at the joint surface after molding will be insufficient, affecting the structure's durability. If the thickness is greater than the reinforcing steel cover, the joint surface will protrude from the concrete 3 surface, affecting the subsequent installation of the formwork 2 and the structural flatness.

[0029] During installation, the snap-fit ​​strip 1 is arranged along the length of the horizontal construction joint and fixed to the inner surface of the formwork 2 by snap-fit. During installation, it is essential to ensure that the snap-fit ​​strip 1 is straight, secure, and tightly snapped against the surface of the formwork 2. To ensure the reliability of the snap-fit, the groove of the snap-fit ​​strip 1 can be processed with a certain slope to make the snap-fit ​​with the formwork 2 even tighter, preventing displacement during the pouring and vibration of the concrete 3.

[0030] To ensure that the snap-fit ​​strip 1 does not shift during the pouring and vibration of concrete 3, in this design, the spacing between the opening sides of the U-shaped inner wall 102 is less than the thickness of the formwork 2, forming a sloping groove. The sloping groove makes the snap-fit ​​strip 1 more tightly connected to the formwork 2.

[0031] To facilitate the smooth separation of the retaining strip 1 from the concrete 3 during demolding, a release agent is applied to the surface of the retaining strip 1 facing the concrete 3. In addition, a lifting ring is welded to the top of the retaining strip 1. During demolding, the lifting ring applies tension to separate the retaining strip 1 from the concrete 3, which not only facilitates the disassembly operation but also avoids damage to the joint surface of the concrete 3 caused by violent demolding.

[0032] See Figure 1 , Figure 2 The method of the present invention will be further explained below with reference to specific construction steps: Step 1, Construction Preparation and Positioning: Determine the location of horizontal construction joints according to the drawings and process requirements. Complete the reinforcement binding work for vertical components (such as shear walls, frame columns, etc.), ensuring that the position, spacing, and protective layer thickness of the reinforcement meet the design and specification requirements. Then, assemble and position formwork 2. Formwork 2 should be firmly installed with tight joints, and its verticality and flatness should meet the specification requirements.

[0033] Step 2, Installation of Connecting Strip 1: At the corresponding position of the construction joint, fix the connecting strip 1 along the length of the horizontal construction joint on the inner surface of the formwork 2. Connecting strip 1 is a strip-shaped component made of thin steel plate, and its thickness is equal to the thickness of the reinforcing steel protective layer. The following points should be noted during installation: Ensure that the connecting strip 1 is installed straight, without bending or twisting; ensure that the connecting strip 1 is tightly engaged with the inner wall of the formwork 2, without any gaps; ensure that the connecting strip 1 is firmly fixed and will not shift during subsequent concrete 3 pouring and vibration. The groove of the connecting strip 1 can be processed into a sloping structure to enhance the tightness of the engagement. Apply a release agent evenly to the surface of the connecting strip 1 facing the concrete 3 to facilitate separation during demolding.

[0034] Step 3, Concrete 3 Pouring: Concrete 3 is poured according to conventional procedures. During pouring, attention should be paid to compaction, especially at construction joints, ensuring that concrete 3 fully fills the forming space between the retaining strip 1 and the formwork 2, without voids or honeycombing. During vibration, avoid direct contact between the vibrator and the retaining strip 1 to prevent displacement or deformation. Concrete 3 pouring should be continuous; if interruptions are necessary, the interval should not exceed the initial setting time of concrete 3.

[0035] Step 4, Demolding and Joint Surface Forming: After the concrete 3 reaches the demolding condition, remove the clamping strip 1 and formwork 2. When removing formwork 2, clamping strip 1 detaches from the concrete 3 surface along with formwork 2. Because the side of clamping strip 1 facing the concrete 3 is pre-coated with release agent, and the surface of the thin steel plate is smooth, the adhesion between clamping strip 1 and concrete 3 is small, allowing for easy separation. If lifting rings are welded to clamping strip 1, pulling force can be applied through the lifting rings to assist in disassembly. After demolding, a neat and regular joint surface naturally forms at the construction joint location. The flatness and straightness of this joint surface are guaranteed by the processing and installation accuracy of clamping strip 1, requiring no subsequent processing such as marking lines, cutting, or chiseling.

[0036] The technical effects of this invention can be verified through the following comparisons: In terms of labor input, traditional construction joint treatment processes require multiple trades such as line markers, cutters, and roughening workers, resulting in high labor costs. With this invention, only one additional worker is needed in the formwork stage to install the interlocking strips; all other processes are eliminated, reducing labor input by more than 60%.

[0037] In terms of construction efficiency, traditional processes such as marking lines, cutting, and roughening are time-consuming, and each process waits for the others, resulting in a long overall construction period. This invention completes the joint surface forming and concrete pouring simultaneously, and the formwork is formed immediately upon demolding, improving construction efficiency by more than 50%.

[0038] Regarding quality stability, traditional manual operations suffer from significant quality fluctuations, making it difficult to guarantee the flatness and straightness of the joint surface. This invention employs a mold-forming method, where the quality of the joint surface is determined by the precision of the clamping strip, ensuring stable and controllable quality and effectively avoiding quality defects such as misalignment and unevenness caused by operational errors.

[0039] In terms of environmental impact, traditional cutting and chiseling operations generate a large amount of dust and noise. This invention eliminates these pollution sources at the source, significantly improving the construction environment and meeting the requirements of green construction.

[0040] In terms of economy, the snap-fit ​​strip is made of thin steel plate, which has high strength and rigidity. It is not easily damaged during concrete pouring and vibration, and can be reused many times, thus having good economic benefits.

[0041] In summary, this invention, through the technical means of pre-embedding snap-fit ​​strips during the formwork stage, achieves chiseling-free shaping of construction joint surfaces. This fundamentally solves the problems of cumbersome procedures, unstable quality, low efficiency, and environmental pollution associated with traditional construction joint treatment processes, demonstrating significant technological advancement and broad application prospects. This invention eliminates the need for string line cutting, reducing labor input by over 60%, increasing construction efficiency by 50%, ensuring stable and reliable joint surface quality, eliminating dust and noise pollution, and providing robust, durable, and reusable steel snap-fit ​​components, resulting in significant economic and environmental benefits.

[0042] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A rapid construction method for horizontal construction joints in vertical structural members, characterized in that, Includes the following steps: Step 1: Determine the location of the horizontal construction joint according to the drawing requirements and process requirements, and complete the binding of the vertical component reinforcement and the assembly of the formwork (2); Step 2: At the corresponding position of the construction joint, fix the snap-fit ​​strip (1) along the length of the horizontal construction joint on the inner surface of the template (2). The thickness of the snap-fit ​​strip (1) is equal to the thickness of the steel reinforcement protective layer. During installation, ensure that the snap-fit ​​strip (1) is straight and firmly snapped tightly to the surface of the template (2) to form a flush-cut mold. Step 3: Pour concrete (3) according to conventional process, vibrate and compact it to ensure that the concrete (3) at the construction joint is fully formed; Step 4: After the concrete (3) reaches the demolding conditions, remove the snap-fit ​​strip (1) and the formwork (2). The snap-fit ​​strip (1) forms a neat and regular joint surface at the construction joint.

2. The rapid construction method for horizontal construction joints of vertical components according to claim 1, characterized in that: The snap-fit ​​strip (1) has a release agent applied to the side facing the concrete (3).

3. The rapid construction method for horizontal construction joints of vertical components according to claim 1, characterized in that: The snap-fit ​​strip (1) consists of an inner wall (102) with a U-shaped cross section and an outer wall (101) with a U-shaped cross section. Both the inner wall (102) and the outer wall (101) are made of thin steel plates. The edges of the inner wall (102) and the outer wall (101) are connected by a connecting plate (103). The inner wall (102) is attached to the surface of the template (2). There is a gap between the outer wall (101) and the inner wall (102), and the gap width is equal to the thickness of the steel reinforcement protective layer.

4. The rapid construction method for horizontal construction joints of vertical components according to claim 3, characterized in that: The U-shaped inner wall (102) has an opening side spacing smaller than the thickness of the template (2), forming a groove with a slope.

5. The rapid construction method for horizontal construction joints of vertical components according to claim 1, characterized in that: The top surface of the snap-fit ​​strip (1) is welded with a lifting ring.

Images