Reinforcing construction method for steel reinforced concrete inclined wall

Abstract

The invention provides a reinforcing construction method for a steel reinforced concrete inclined wall, which comprises the following steps of: S1, defining the thickness of a template in an inclined wall template and the distance between a vertical secondary ridge, a main keel and a screw rod so as to ensure the overall rigidity of a template system; s2, according to the concrete pouring speed, the evenly-distributed load on the formwork in the pouring period is calculated, and the installation distances of the inclined struts, the transverse steel pipes and the horizontal supporting rods are determined; s3, a full framing is erected, and the construction requirements of n layers of wall columns and the construction requirements of (n + 1) layers of floors are met; s4, when inclined wall reinforcing steel bars are bound, a temporary inclined strut is arranged at the two-thirds position of the floor height so as to prevent a structural protection layer from being too large; and S5, a horizontal supporting rod and a pressing foot are additionally arranged at the junction of the bottom of the formwork and the floor slab. According to the reinforcing construction method of the steel reinforced concrete inclined wall, the inclined steel bars are supported in an auxiliary mode in a frame reinforcing mode, the section size of the frame is calculated and designed through structural mechanics, so that deflection and stress are controlled, the construction quality of the inclined wall is guaranteed, and the collapse risk of the steel bars is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of super high-rise building construction, and in particular relates to a reinforcement construction method for a steel-concrete inclined wall. Background Art

[0002] In the construction of super high-rise buildings, the construction of inclined walls is difficult due to their special structure. In particular, the traditional method of directly using formwork to support the inclined steel bars for tying and supporting the inclined steel bars cannot accurately control key dimensions such as the inclination of the steel bars and the thickness of the protective layer, which can easily lead to substandard construction quality of the inclined wall and even safety hazards. This is because the formwork support system is difficult to fully adapt to the oblique mechanical characteristics of the inclined wall steel bars, resulting in the difficulty in fixing the position of the steel bars during the steel bar tying and concrete pouring process, and the accuracy and stability of the inclined wall are difficult to guarantee.

[0003] In addition, the inclination of the steel bars and the thickness of the protective layer directly affect the bearing capacity and durability of the inclined wall. If the inclination of the steel bars is not accurately controlled, it will lead to uneven stress distribution of the inclined wall, affecting its overall performance. If the thickness of the protective layer is insufficient, the corrosion resistance of the steel bars cannot be guaranteed, reducing the service life of the inclined wall. Therefore, the traditional construction method has the problem of ensuring the quality of the inclined wall construction and preventing the risk of steel bar collapse.

[0004] Therefore, it is necessary to provide a new reinforcement construction method for steel-concrete inclined wall to solve the above-mentioned technical problems. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a reinforcement construction method for steel-concrete inclined walls, which adopts a frame reinforcement method to assist in supporting inclined steel bars, designs the cross-sectional dimensions of the frame through structural mechanics calculations to control deflection and force, ensures the construction quality of the inclined wall and prevents the risk of steel bar collapse.

[0006] In order to solve the above technical problems, the reinforcement construction method of the steel-concrete inclined wall provided by the present invention comprises the following steps:

[0007] S1. Design the formwork thickness, vertical secondary beams, main keels and screw spacing in the inclined wall formwork to ensure the overall rigidity of the formwork system;

[0008] S2. Calculate the uniform load on the formwork during the pouring period according to the concrete pouring speed, so as to determine the installation spacing of the diagonal braces, transverse steel pipes, and horizontal support rods. The purpose is to ensure that the rigidity and stability of the overall reinforcement system can be guaranteed under the most unfavorable working conditions during concrete pouring;

[0009] S3. Set up a full-height frame to meet the construction requirements of the n-layer wall columns and the n+1-layer floor slabs;

[0010] S4. During the process of tying the inclined wall reinforcement, two temporary diagonal braces are set at two-thirds of the floor height to ensure that the position of the reinforcement during the tying process meets the requirements of the drawings and to avoid excessive structural protection after the formwork is sealed. Steel pipes are pre-buried in the floor slab, and the bottom of the steel pipes is attached to the bottom reinforcement of the beam and slab. The bottom of the diagonal brace is in contact with the steel pipe, and the top of the diagonal brace is fixedly connected to the inclined wall reinforcement. After that, the temporary diagonal brace of the steel pipe is removed simultaneously with the reinforcement of the inner formwork;

[0011] S5. In order to prevent the bottom formwork from exploding, leaking, and other problems caused by pouring concrete too quickly, horizontal support rods and pressure feet can be appropriately added at the junction of the bottom of the formwork and the floor slab.

[0012] As a further solution of the present invention, the presser foot method is specifically as follows:

[0013] 1). Pre-embed U-shaped steel bars on the floor slab, the steel bars clamp the double 50*3.0 square steels, and all the secondary keels of the shear wall formwork are against the double 50*3.0 square steels;

[0014] 2). On the outside of the inclined wall, where the straight wall becomes an inclined wall, the first screw of the inclined wall section is welded to the bottom of the main reinforcement of the shear wall to prevent leakage of concrete from the outer formwork of the inclined wall during concrete pouring.

[0015] As a further solution of the present invention, the inclined wall construction needs to consider the forces of the inclined wall's steel load, wind load, construction load, etc. on the steel support frame in a super high-rise structure during the construction phase, and the load distribution form can be assumed to be uniformly distributed load, concentrated load, etc.

[0016] As a further solution of the present invention, the stress characteristics of the support frame need to be considered during its construction, and a frame beam stress model and a frame column stress model are established based on the information.

[0017] As a further solution of the present invention, during the construction of the support frame, the original internal steel sections can be used as frame columns, and frame beams can be welded between them to form a steel support frame. Assuming that the calculation model of the frame beam is a continuous beam and the calculation model of the frame column is a cantilever beam, the corresponding force-deformation diagram can be calculated.

[0018] As a further solution of the present invention, the strength verification and deformation verification of the support frame need to be considered during the construction of the support frame, so as to ensure that the calculation results meet the corresponding steel bar arrangement safety and quality requirements, and then further determine the component size of the support frame.

[0019] As a further solution of the present invention, when designing the inclined wall formwork, it is necessary to perform detailed calculations on the load-bearing capacity of the formwork, including horizontal load-bearing capacity and vertical load-bearing capacity. At the same time, it is necessary to calculate the load that the inclined wall needs to bear based on the actual engineering conditions, so as to select the best combination method, improve the load-bearing capacity of the inclined wall, and ensure the overall stability.

[0020] As a further solution of the present invention, during the tying process of the inclined wall reinforcement, the upper part of the longitudinal reinforcement is first fixed with a steel wire rope, and then the roots of the reinforcement are tied, which can effectively reduce the possibility of bending of the reinforcement, thereby ensuring the stability of the inclined wall.

[0021] As a further solution of the present invention, the steel bar binding must be carried out strictly in accordance with the construction requirements, and wooden strips of the same thickness and length as the steel bars can be selected at the upper part of the template, so that the area around the steel bars can be reinforced, thereby forming effective protection for the steel bars.

[0022] As a further solution of the present invention, the first screw rod at the bottom of the inclined wall is welded to the main reinforcement, and the screw rod can fix the formwork on both sides.

[0023] Compared with the related art, the reinforcement construction method of the steel-concrete inclined wall provided by the present invention has the following beneficial effects:

[0024] 1. The present invention can effectively improve the construction quality and avoid the increase of construction period and cost caused by rework by adding reinforcement measures to the inclined wall of the super-high-rise core tube;

[0025] 2. The present invention quantifies the design parameters of the reinforcement measures, and can design corresponding support frame measures in detail to the load of each construction section, so as to effectively control the construction cost of the reinforcement measures and ensure the construction quality of the overall inclined wall;

[0026] 3. Compared with the prior art, the present invention usually only uses diagonal braces and full-frame to reinforce the inclined wall formwork, which makes it difficult to ensure the positioning of the steel bars, and easily causes exposed steel bars and too thick protective layer. The steel bar support frame added in this solution can avoid the above phenomenon;

[0027] 4. The steel support frame of the present invention has simple force transmission and clear force, and the force deformation of the frame can be obtained through simple calculation. It has obvious advantages in effectively controlling the force deformation of the frame and optimizing the cost of the steel support structure. The table parameters listed in the scheme can be continuously improved in future practice, which is conducive to the technical development of inclined wall construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0029] Figure 1 This is the plan view of the load-bearing wall at the corner of the middle inclined wall of the present invention;

[0030] Figure 2 This is a schematic diagram of the continuous beam of the present invention;

[0031] Figure 3 This is a schematic diagram of the mid-cantilever beam of the present invention;

[0032] Figure 4 It is a plan view of a load-bearing wall at a certain inclined corner after the embedded steel in the present invention;

[0033] Figure 5 This is a schematic diagram of the steel bar support frame of the present invention;

[0034] Figure 6 This is a cross-sectional view of the steel bar support frame of the present invention;

[0035] Figure 7 It is the stress deformation diagram of the type of the present invention;

[0036] Figure 8 This is a schematic diagram of the medium-sloped wall reinforcement system of the present invention;

[0037] Fig. 9 This is a schematic diagram of the steel pipe diagonal brace of the present invention;

[0038] Fig.10 This is the embedded sample of the diagonal brace of the middle floor slab of the present invention;

[0039] Fig.11 This is a schematic diagram of the method of making the inner side presser foot of the inclined wall of the present invention;

[0040] Fig.12 This is a schematic diagram of the method of making the outer side presser foot of the inclined wall of the present invention;

[0041] Fig.13 This is the construction flow chart of the medium inclined wall of the present invention. DETAILED DESCRIPTION

[0042] Please refer to Figures 1 to 13 ,in, Figure 1 This is the plan view of the load-bearing wall at the corner of the middle inclined wall of the present invention; Figure 2 This is a schematic diagram of the continuous beam of the present invention; Figure 3 This is a schematic diagram of the mid-cantilever beam of the present invention; Figure 4 It is a plan view of a load-bearing wall at a certain inclined corner after the embedded steel in the present invention; Figure 5 This is a schematic diagram of the steel bar support frame of the present invention; Figure 6 This is a cross-sectional view of the steel bar support frame of the present invention; Figure 7 It is the stress deformation diagram of the type of the present invention; Figure 8 This is a schematic diagram of the medium-sloped wall reinforcement system of the present invention; Fig. 9 This is a schematic diagram of the reinforced steel pipe diagonal brace of the present invention; Fig.10 This is the embedded sample of the diagonal brace of the middle floor slab of the present invention; Fig.11 This is a schematic diagram of the method of making the inner side presser foot of the inclined wall of the present invention; Fig.12 This is a schematic diagram of the method of making the outer side presser foot of the inclined wall of the present invention; Fig.13 This is the construction flow chart of the medium inclined wall of the present invention.

[0043] A reinforcement construction method for a steel-concrete inclined wall comprises the following steps:

[0044] S1. Design the formwork thickness, vertical secondary beams, main keels and screw spacing in the inclined wall formwork to ensure the overall rigidity of the formwork system;

[0045] S2. Calculate the uniform load on the formwork during the pouring period according to the concrete pouring speed, so as to determine the installation spacing of the diagonal brace, transverse steel pipe and horizontal support rod. The purpose is to ensure the rigidity and stability of the overall reinforcement system under the most unfavorable working conditions during concrete pouring. Refer to the following Table 1;

[0046] Table 1

[0047]

[0048] S3. According to the specification, the erection of the full-height frame must meet the construction requirements of the n-layer wall columns and the n+1-layer floor slabs;

[0049] S4. During the process of tying the inclined wall reinforcement, two temporary diagonal braces are set at two-thirds of the floor height to ensure that the position of the reinforcement during the tying process meets the requirements of the drawings and to avoid excessive structural protection after the formwork is sealed. Fig. 9 and Fig.10 As shown, a steel pipe is embedded in the floor slab, the bottom of the steel pipe is attached to the bottom reinforcement of the beam and slab, the bottom of the diagonal brace is in contact with the steel pipe, and the top of the diagonal brace is fixedly connected to the diagonal wall reinforcement. After that, the temporary diagonal brace of the steel pipe is removed simultaneously with the reinforcement of the inner formwork;

[0050] S5. To prevent the bottom formwork from exploding and leaking due to excessively fast concrete pouring, horizontal support rods and pressure feet can be added at the junction of the bottom of the formwork and the floor slab. Figure 8 Template bottom and Fig.10 Schematic diagram.

[0051] The presser foot method is as follows:

[0052] 1). Pre-embed U-shaped steel bars on the floor slab, the steel bars clamp the double 50*3.0 square steels, and all the secondary keels of the shear wall formwork are against the double 50*3.0 square steels;

[0053] 2). On the outside of the inclined wall, where the straight wall becomes an inclined wall, the first screw of the inclined wall section is welded to the bottom of the main reinforcement of the shear wall to prevent leakage of concrete from the outer formwork of the inclined wall during concrete pouring.

[0054] The inclined wall construction needs to consider the forces of the inclined wall's reinforcement load, wind load, construction load, etc. on the reinforcement support frame in a super high-rise structure during the construction phase, and the load distribution form can be assumed to be uniformly distributed load, concentrated load, etc.

[0055] The stress characteristics of the support frame should be considered during construction, and the stress model of the frame beam and the stress model of the frame column should be established based on the information, such as Figure 1 This is the plan view of the corner load-bearing wall of a sloping wall.

[0056] When constructing the support frame, the original steel sections inside can be used as frame columns, and frame beams are welded between them to form a reinforced support frame. Assuming that the calculation model of the frame beam is a continuous beam and the calculation model of the frame column is a cantilever beam, the corresponding force deformation diagram can be calculated, such as Figure 2 and Figure 3 shown.

[0057] During the construction of the support frame, the strength verification and deformation verification of the support frame need to be considered to ensure that the calculation results meet the corresponding steel bar arrangement safety and quality requirements, and then further determine the component size of the support frame. Refer to the following Table 2 for design. Table 2 below is the force and deformation requirements of the support frame.

[0058] Table 2

[0059] Total deflection reference value Strength calculation Quality Evaluation 0~30mm pass excellent 30~35mm pass good 35~40mm pass Pass >40mm Pass or Fail Fail

[0060] When designing the inclined wall formwork, it is necessary to perform detailed calculations on the load-bearing capacity of the formwork, including horizontal load-bearing capacity and vertical load-bearing capacity. At the same time, it is necessary to calculate the load that the inclined wall needs to bear based on the actual project conditions, so as to select a reasonable load combination method, improve the load-bearing capacity of the inclined wall, and ensure overall stability.

[0061] During the tying process of the inclined wall reinforcement, the upper part of the longitudinal reinforcement is first fixed with a steel wire rope, and then the roots of the reinforcement are tied, thereby effectively reducing the possibility of bending of the reinforcement, thereby ensuring the stability of the inclined wall.

[0062] The steel bar binding must be carried out strictly in accordance with the construction requirements, and wooden strips of the same thickness and length as the steel bars can be selected at the upper portion of the template, so that the area around the steel bars can be reinforced, thereby forming effective protection for the steel bars.

[0063] When the steel bars are being tied, the first screw rod at the bottom of the inclined wall is welded to the main reinforcement, and the screw rod can fix the templates on both sides.

[0064] By adding reinforcement measures to the inclined walls of super-high-rise core tubes, the construction quality can be effectively improved and the increase in construction time and costs caused by rework can be avoided.

[0065] By quantifying the design parameters of the reinforcement measures, the load of each construction section can be determined in detail to design the corresponding support frame measures, effectively control the construction cost of the reinforcement measures and ensure the construction quality of the overall inclined wall.

[0066] The existing technology usually only uses diagonal braces and full-frame to reinforce the inclined wall formwork, which makes it difficult to ensure the positioning of the steel bars, and it is easy to cause exposed steel bars, too thick protective layer, etc. The steel bar support frame added in this solution can avoid the above phenomenon.

[0067] The steel support frame has simple force transmission and clear force, and the force deformation of the frame can be obtained through simple calculations. It has obvious advantages in effectively controlling the force deformation of the frame and optimizing the cost of the steel support structure.

[0068] See also Fig.13 The present invention provides a method for constructing a sloping wall, comprising the following steps:

[0069] Step 1: Determine the construction drawing, confirm the construction form, and carry out the first stage of pre-embedding the bottom pressure foot, diagonal brace, and steel support frame;

[0070] Step 2: Carry out n-layer formwork construction;

[0071] Step 3: Perform measurement and layout to determine the full rack points;

[0072] Step 4: Installation of steel support frame;

[0073] Step 5: Binding and acceptance of inclined wall reinforcement;

[0074] Step 6: Installation of inclined wall formwork, primary and secondary keels;

[0075] Step 7: Install the diagonal brace;

[0076] Step 8: Acceptance of template verticality and inclination;

[0077] Step 9: Carry out the second stage of pre-embedding the bottom presser foot, diagonal brace, and steel bar support frame;

[0078] Step 10: integral pouring of the n-layer wall and the n+1-layer floor slab;

[0079] Step 11: Determine whether n+1 is a sloping wall floor. If so, proceed to step 3. Otherwise, the sloping wall construction is completed.

[0080] With this construction method, the quality of the inclined wall construction has been significantly improved, and each construction step has been precisely planned and verified. The stability of the inclined wall is guaranteed during the construction process by embedding supports and pressure feet in stages. The strict acceptance of the verticality and inclination of the formwork ensures the accuracy of the structure, thereby improving the overall safety and durability of the building. In addition, the integral pouring step takes into account the mutual influence between floors, optimizes the construction process, and saves time and cost. Through the cyclic judgment steps, the continuity of construction and the consistency of the quality of each floor are ensured.

[0081] The technical effects brought about by the technical solution provided by the present invention include:

[0082] 1. By adding reinforcement measures for the inclined walls of super-high-rise core tubes, the construction quality can be effectively improved and the increase in construction period and costs caused by rework can be avoided.

[0083] 2. By quantifying the design parameters of the reinforcement measures, the load of each construction section can be determined in detail to design the corresponding support frame measures, effectively control the construction cost of the reinforcement measures and ensure the construction quality of the overall inclined wall.

[0084] 3. The existing technology usually only uses diagonal braces and full-frame to reinforce the inclined wall formwork, which makes it difficult to ensure the positioning of the steel bars and easily causes phenomena such as exposed steel bars and too thick protective layer. The steel bar support frame added in this solution can avoid the above phenomena.

[0085] 4. The force transmission of the steel support frame is simple and the force is clear. The force deformation of the frame can be obtained through simple calculations. It has obvious advantages in effectively controlling the force deformation of the frame and optimizing the cost of the steel support structure. The table parameters listed in the plan can be continuously improved in future practice, which is conducive to the technical development of inclined wall construction.

[0086] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A reinforcement construction method for a steel-concrete inclined wall, characterized in that: The following steps are involved: S1. Define the formwork thickness, vertical secondary beams, main keels and screw spacing in the inclined wall formwork to ensure the overall rigidity of the formwork system itself; S2. Calculate the uniform load on the formwork during the pouring period according to the concrete pouring speed, and determine the installation spacing of the diagonal braces, transverse steel pipes, and horizontal support rods; S3. Set up a full-height frame to meet the construction requirements of the n-layer wall columns and the n+1-layer floor slabs; S4. When tying the inclined wall reinforcement, a temporary diagonal brace is set at two-thirds of the floor height to avoid too large a structural protective layer. A steel pipe is pre-buried in the floor slab, the bottom of the steel pipe is attached to the bottom reinforcement of the beam and slab, the bottom of the diagonal brace is in contact with the steel pipe, and the top of the diagonal brace is fixedly connected to the inclined wall reinforcement; S5. Add horizontal support rods and pressure feet at the junction of the bottom of the formwork and the floor slab.

2. The reinforcement construction method of steel-concrete inclined wall according to claim 1 is characterized in that: The specific steps for presser foot are as follows: Pre-embed U-shaped steel bars on the floor slab, and use the steel bars to clamp the square steel bars on both sides, so that all secondary keels are in contact with the square steel bars; On the outside of the inclined wall, where the straight wall becomes an inclined wall, the first screw is welded to the bottom of the main reinforcement of the shear wall to prevent leakage of mortar from the formwork on the outside of the inclined wall.

3. The reinforcement construction method of steel-concrete inclined wall according to claim 1 is characterized in that: According to the stress characteristics of the support frame construction, the frame beam stress model and frame column stress model are established.

4. The reinforcement construction method of steel-concrete inclined wall according to claim 2 is characterized in that: When constructing the supporting frame, the original internal steel sections can be used as frame columns, and frame beams can be welded between them to form a reinforced support frame. If the calculation model of the frame beam is a continuous beam, the calculation model of the frame column is a cantilever beam.

5. The reinforcement construction method of steel-concrete inclined wall according to claim 1 is characterized in that: The order of tying the steel bars for inclined walls is as follows: the first step is to fix the upper part of the longitudinal bars with steel wire ropes; the second step is to tie up the roots of the steel bars.

6. The reinforcement construction method of steel-concrete inclined wall according to claim 1 is characterized in that: The first screw at the bottom of the inclined wall is welded to the main reinforcement, and the screw fixes the formwork on both sides.

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