An armpit angle steel mold reinforcing bolt is used as a disc buckle type frame body base support structure and a construction method

Abstract

The application provides a kind of armpit angle steel mould reinforcing bolt and do disc buckle type frame body base supporting structure and its construction method, belong to subway station civil engineering technical field, including multiple fixed screw rods embedded in the armpit angle concrete that has been poured, the fixed screw rod is provided with frame body supporting plate assembly through nut, frame body supporting plate assembly provides support surface for the disc buckle frame body base at upper part;Frame body supporting plate assembly includes bottom end fixed plate, upper end fixed plate and frame body supporting plate erected between the two;Bottom end fixed plate is in close contact with the surface of armpit angle concrete, and is fixed by bottom end fixed plate nut;Upper end fixed plate is fixed on the fixed screw rod by upper end fixed plate lower nut and upper end fixed plate upper nut;Strip-shaped groove for adjusting horizontal position is opened on the upper end fixed plate, and is tightly fixed by steel wedge block;The application can not only ensure the reinforcing effect of armpit angle formwork, but also provide integrated construction method for stable support for subsequent full-frame body, to improve construction efficiency and structural safety.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology for subway stations, specifically to a steel formwork reinforcement bolt that also serves as a disc-lock type frame base support structure and its construction method. Background Technology

[0002] As a crucial component of modern urban public transportation, the construction quality of subway stations directly impacts structural safety and service life. In subway station civil engineering construction, the haunch angle, a critical connection between the side wall and the base or roof slab, significantly affects the overall structural performance due to the quality of its concrete pouring. Currently, subway stations often employ a single-sided large steel formwork system for side wall and haunch angle construction. This system offers advantages such as fewer formwork seams, high turnover efficiency, and good concrete forming quality, effectively avoiding common quality defects like honeycomb, pitting, and grout leakage.

[0003] However, in actual construction, the steel formwork at the axle angle is usually reinforced with pre-embedded bolts. After the formwork is removed, these bolts often need to be cut off, resulting in material waste and posing safety risks. On the other hand, due to the large size of the axle angle structure in subway stations, the base of the full-span support frame cannot effectively avoid the axle angle area, requiring the frame to be erected directly on the already poured axle angle concrete surface. In this case, if reliable support points are lacking, the frame base is prone to displacement or settlement, leading to insufficient overall stability of the support system. This, in turn, causes uneven settlement during the pouring of the upper structure, seriously affecting the safety of the frame and the quality of concrete forming.

[0004] Current technologies have not effectively solved the problem of supporting the base of the scaffold structure at the armhole corner. Temporary reinforcement or the addition of pads are often used during construction, but these measures have limited effectiveness and increase construction complexity, impacting the construction period. Therefore, there is an urgent need for an integrated construction method that can both ensure the reinforcement of the armhole corner formwork and provide stable support for the subsequent full-span scaffold structure, thereby improving construction efficiency and structural safety. Summary of the Invention

[0005] Purpose of the Invention: The purpose of this invention is to address the shortcomings of existing technologies by providing a support structure and construction method for a steel formwork reinforcement bolt at the axle corner, which also serves as a disc-lock scaffold base support. This invention uses steel formwork for the axle corner, reinforced with pre-embedded bolts. After concrete pouring, the axle corner steel formwork is removed, and an adjustable scaffold support plate is installed on the pre-embedded bolts. The scaffold base at the axle corner is then finally erected on the support plate. This invention effectively solves the problem of the lack of support points for the upper scaffold base after concrete pouring at the axle corner in subway station civil engineering, thus significantly improving construction quality and accelerating construction speed.

[0006] Technical solution: The present invention provides a steel formwork reinforcement bolt for the axle corner that also serves as a support structure for the base of a disc-lock frame, comprising multiple fixing screws embedded in the poured axle corner concrete, and a frame support plate assembly fitted onto the fixing screws with nuts, the frame support plate assembly providing a support surface for the upper disc-lock frame base; The frame support plate assembly includes a bottom fixing plate, an upper fixing plate, and a frame support plate installed between the two. The bottom fixing plate is tightly attached to the concrete surface at the axle corner and is fixed by the bottom fixing plate nut. The upper fixing plate is fixed to the fixing screw by the lower nut and the upper nut of the upper fixing plate, which presses the frame support plate tightly. The upper fixing plate has a strip groove for adjusting the horizontal position and is fixed by steel wedges.

[0007] The core of this invention lies in its "dual-purpose bolt." First, during the concrete pouring stage, the fixing bolt serves as a reinforcement for the haunch angle steel formwork, bearing the lateral pressure of the concrete and ensuring the quality of the haunch angle formation. After demolding, these pre-embedded bolts transform into permanent load-bearing bases. The frame support plate assembly is secured to the bolts with nuts, distributing the vertical load transmitted from the upper frame to the haunch angle concrete surface through the bottom fixing plate. Simultaneously, the bolts themselves bear tensile and pull-out forces, while the strip grooves and steel wedges of the upper fixing plate provide the ability to fine-tune the level, ensuring that the top surface of the frame support plate is level and that the frame base is subjected to uniform stress.

[0008] Furthermore, the horizontal spacing of the fixing screws is 300mm, which is the greatest common divisor of the span of the upper disc-type frame in the direction parallel to the armpit angle.

[0009] Setting the screw spacing to the greatest common divisor of the frame span (such as 600mm, 900mm, 1200mm) means that no matter where the frame upright is finally placed in the armpit corner, a corresponding pre-embedded screw can always be found under its base for installation, realizing modular matching between the frame layout and the screw position.

[0010] Furthermore, the length of the frame support plate matches the longitudinal span of the upper disc-lock frame, which is 700mm, 1000mm, or 1300mm respectively. The length of the frame support plate matches the standard span of the frame, ensuring that a single support plate can completely cover and stably support the frame base of the corresponding span, providing a sufficiently long support surface for the base.

[0011] Furthermore, it also includes a rotating rod, which is connected to the frame support plate and is used to adjust the levelness of the frame support plate during installation.

[0012] A construction method for using the aforementioned axle angle steel formwork reinforcement bolt as a support structure for the disc-lock type frame base is characterized by the following steps: Step 1, Frame Design: Design the disc-lock support frame according to the structural drawings, determine its step distance, span and erection position, and determine the planar position of the frame base at the armpit corner; Step 2, Integrated Design: Based on the base position of the frame determined in Step 1, design the plane position of the reinforcement holes and fixing screws on the angle steel template to simultaneously meet the requirements of template reinforcement and subsequent installation of the frame support plate; and design the specifications of the frame support plate assembly. Step 3, Installation of haunch corner formwork and concrete pouring: Install the haunch corner steel formwork, weld the fixing bolts to the main structural steel bars, and then pour the concrete for the slab, haunch corner and lower part of the side wall; Step 4: Removal of formwork and retention of embedded bolts: After the concrete reaches its strength, remove the angle steel formwork and retain the embedded fixing bolts; Step 5, Frame support plate installation: Clean the concrete surface, install the frame support plate assembly on the pre-embedded fixing screws, tighten with nuts and level with steel wedges; Step 6: Erection of full-span scaffolding: Place the base of the disc-lock scaffolding on the leveled scaffolding support plate, and complete the overall erection of the upper full-span support scaffolding.

[0013] Furthermore, in step 3, the welding of the fixing screw to the main structural steel bar meets the requirement of single-sided welding of 10d or double-sided welding of 5d, where d is the screw diameter, and ensures that the fixing screw is perpendicular to the concrete surface of the axle corner.

[0014] Furthermore, in step 5, the installation of the frame support plate assembly specifically includes: first, inserting the bottom fixing plate into the fixing screw and pressing it against the concrete surface, and initially fixing it with the bottom fixing plate nut; then, sequentially installing the lower nut of the upper fixing plate, the upper fixing plate, and the upper nut of the upper fixing plate; after adjusting the frame support plate to be level by rotating the rod, tightening the upper and lower nuts, and inserting steel wedges into the gap between the strip groove of the upper fixing plate and the fixing screw to enhance stability.

[0015] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows: (1) The present invention uses nuts to firmly connect the frame support plate assembly to the solid concrete structure, forming a stable rigid support, which effectively solves the problem of easy slippage and unstable settlement when the frame is directly supported on the arc-shaped axle, greatly improving the safety and reliability of the support system. The unique strip groove and steel wedge block design can compensate for construction errors, accurately level the frame support plate, ensure the axial force of the upper frame uprights, avoid eccentric loads, and further ensure the overall stability of the frame. (2) The fixed screw spacing designed in this invention allows the frame uprights to be flexibly positioned according to the standard span, and can always match the pre-embedded screw system, avoiding support failure or secondary drilling due to position conflict. This allows the load of the frame uprights to be directly and effectively transferred to the screws below through the support plate. The force flow transmission path is clear and reasonable, and the stress performance of the structure is optimized. (3) In the process of civil construction of subway stations, the present invention uses the steel formwork at the armpit corner to reinforce the screw rod to install the frame support plate. The frame support plate provides a reliable support surface for the upper part of the frame at the armpit corner, which improves the stability of the frame erection, reduces the impact of construction disturbance on the load-bearing capacity of the frame, and improves the safety and quality of the full-span frame construction. (4) This invention pre-designs the haunch angle steel formwork system and the full-span scaffolding system, arranges the span of the full-span scaffolding system, and rationally optimizes the spacing and planar position of the reinforcing bolts, so that the reinforcing bolts simultaneously meet the requirements of haunch angle steel formwork reinforcement and full-span scaffolding support plate installation. After the scaffolding support plate is installed, the scaffolding base can be directly supported on the support plate, improving construction efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; In the diagram: 1. Base of the disc-lock frame; 2. Frame support plate; 3. Rotating rod; 4. Bottom fixing plate; 5. Top fixing plate; 6. Nut of the bottom fixing plate; 7. Lower nut of the top fixing plate; 8. Upper nut of the top fixing plate; 9. Steel wedge; 10. Fixing screw; 11. Concrete poured at the armpit corner. Detailed Implementation

[0017] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments described.

[0018] Example 1 like Figure 1 The illustrated axle angle steel formwork reinforcement bolt that also serves as a disc-lock scaffold base support structure includes multiple fixing screws 10 pre-embedded in the poured axle angle concrete 11. Scaffold support plate assemblies are fitted onto the fixing screws 10 via nuts, and the scaffold support plate assembly provides a support surface for the upper disc-lock scaffold base 1. It also includes a rotating rod 3, which is connected to the scaffold support plate 2 and is used to adjust the levelness of the scaffold support plate 2 during installation.

[0019] The frame support plate assembly includes a bottom fixing plate 4, an upper fixing plate 5, and a frame support plate 2 erected between the two. The bottom fixing plate 4 is tightly attached to the concrete surface at the axle corner and is fixed by the bottom fixing plate nut 6. The upper fixing plate 5 is fixed to the fixing screw 10 by the lower nut 7 and the upper nut 8 of the upper fixing plate, and presses the frame support plate 2 tightly. The upper fixing plate 5 has a strip groove for adjusting the horizontal position and is fixed by steel wedges 9.

[0020] In this embodiment, the horizontal spacing of the fixing screws 10 is 300mm, which is the greatest common divisor of the span of the upper disc-lock frame in the direction parallel to the armpit angle. The length of the frame support plate 2 matches the longitudinal span of the upper disc-lock frame, which is 700mm, 1000mm or 1300mm respectively.

[0021] Example 2 A construction method for using the aforementioned axle angle steel formwork reinforcement bolts as a base support structure for a disc-lock scaffold includes the following steps: Step 1: Scaffold Design: Based on the subway station structural drawings, analyze the structural type, dimensions, floor height, and load-bearing capacity of the support system. Calculate and determine the step distance, span, and erection location of the socket-type disc-lock steel pipe support system. The recommended spans for socket-type disc-lock scaffolding are 600mm, 900mm, and 1200mm. Prepare the plan, elevation, and section drawings of the structural support system in advance. Use the plan to determine the plane position of the support frame base at the armpit corner. Since the armpit corner steel formwork reinforcement bolts are usually located at one-third of the height of the armpit corner, the base of the scaffold should ideally be positioned between the middle and one-third of the armpit corner to facilitate the installation of the scaffold support plates after the armpit corner concrete is poured.

[0022] Step 2, Integrated Design: Based on the support system layout plan determined in Step 1 and the axle angle dimensions in the subway station structural drawings, determine the position of the upper frame base at the axle angle. Optimize the position of the axle angle steel formwork fixing bolts based on the position of the frame base at the axle angle. The vertical force on the upper frame base at the axle angle is obtained from the frame design in Step 1. By verifying the force on the steel formwork components and frame support plate components, determine the specifications and dimensions of the reinforcing bolts. Ensure that the reinforcing bolts simultaneously meet the installation requirements of the axle angle steel formwork and the force requirements for installing the frame support plate after demolding. The horizontal spacing of the fixing bolts is 300mm. The frame support plate consists of a bottom fixing plate 4, an upper fixing plate 5, a frame support plate 2, nuts, fixing screws 10, steel wedges 9, and rotating rods 3. All components are made of Q235 steel. The bottom fixing plate 4, the upper fixing plate 5, and the frame support plate 2 are 10mm thick steel plates (the appropriate thickness is selected by calculating the stress on the upper frame). The length of the frame support plate is made into 1300mm, 1000mm, and 700mm plates according to the longitudinal span of the frame, corresponding to frame spans of 1200mm, 900mm, and 600mm, respectively.

[0023] The frame support plate 2 is 100mm wide. The bottom fixing plate 4 has holes cut according to the selected fixing screw 10 model. The diameter of the holes is not less than the diameter of the fixing screw 10, and the horizontal spacing between the holes is 300mm. The upper fixing plate 5 has grooves cut at the corresponding hole positions. The groove width is consistent with the hole diameter, and the groove length is 50mm. For different sizes of armholes, the frame support plate 2 can be leveled by using steel wedges 9.

[0024] Step 3: Installation of Haunch Angle Formwork and Concrete Pouring: The haunch angle is constructed simultaneously with the structural slab. The side wall construction joint is 300mm above the haunch angle. During steel formwork installation, two fixing bolts (10) are installed, with a horizontal spacing of 300mm. The fixing bolts (10) are welded to the main reinforcement of the haunch angle. The welding length should meet the requirement of 10d for single-sided welding or 5d for double-sided welding to ensure the strength of the steel formwork reinforcement. After welding, the fixing bolts should be kept perpendicular to the haunch angle surface to facilitate the subsequent installation of the scaffold support plate. After the haunch angle steel formwork is installed, pour the concrete for the slab, haunch angle, and the lower part of the side wall construction joint.

[0025] Step 4: Removal of formwork and retention of embedded bolts: After the concrete reaches its strength, remove the angle steel formwork and retain the embedded fixing bolts 10. Step 5: Installation of the scaffold support plate: Before installing the scaffold support plate, remove any residual debris from the concrete surface to ensure that the surface of the poured haunch concrete 11 is flat and free of foreign objects. During installation, first pass the bottom fixing plate 4 through the fixing screw 10 and place it stably on the surface of the poured haunch concrete 11. Then, pass the bottom fixing plate nut through the fixing screw 10 and tighten the nut to secure it. Next, pass the lower nut 7 of the upper fixing rod, the upper fixing plate 5, and the upper nut 8 of the upper fixing plate through the fixing screw 10. Adjust the scaffold support plate 2 to be horizontal by rotating the rod 3, and tighten the upper and lower nuts. Fill the gap between the fixing screw 10 and the upper fixing plate 5 with the steel wedge 9 to ensure the strength of the connection between the components. Finally, place the disc-lock scaffold base 1 on the scaffold support plate 2.

[0026] Step 6: Erection of full-span scaffolding: Place the base 1 of the disc-lock scaffolding on the leveled scaffolding support plate 2, and complete the overall erection of the upper full-span support scaffolding, so that the upper full-span scaffolding at the armpit corner is erected on the scaffolding support plate and forms a whole with other parts of the scaffolding.

[0027] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A type of axle angle steel formwork reinforcing bolt that also serves as a disc-lock type frame base support structure, characterized in that: Includes multiple fixing screws (10) pre-embedded in the poured haunch corner concrete (11), and the fixing screws (10) are fitted with frame support plate assemblies by nuts, and the frame support plate assemblies provide a support surface for the upper disc buckle frame base (1); The frame support plate assembly includes a bottom fixing plate (4), an upper fixing plate (5), and a frame support plate (2) erected between the two. The bottom fixing plate (4) is tightly attached to the concrete surface at the axle corner and fixed by a bottom fixing plate nut (6). The upper fixing plate (5) is fixed to the fixing screw (10) by a lower nut (7) and an upper nut (8). The upper fixing plate (5) presses and fixes the frame support plate (2). The upper fixing plate (5) has a strip groove for adjusting the horizontal position and is fixed by a steel wedge (9). It also includes a rotating rod (3), which is connected to the frame support plate (2) and is used to adjust the level of the frame support plate (2) during installation.

2. The axle angle steel mold reinforcing bolt that also serves as a disc-lock type frame base support structure according to claim 1, characterized in that: The horizontal spacing of the fixing screws (10) is 300mm, and the horizontal spacing is the greatest common divisor of the span of the upper disc buckle frame in the direction parallel to the armpit angle.

3. The axle angle steel formwork reinforcing bolt also serving as a disc-lock type frame base support structure according to claim 1, characterized in that: The length of the frame support plate (2) is matched with the longitudinal span of the upper disc-lock frame, which is 700mm, 1000mm or 1300mm respectively.

4. A construction method for a lug angle steel formwork reinforcement bolt that also serves as a disc-lock type frame base support structure, as described in any one of claims 1 to 3, characterized in that... Includes the following steps: Step 1, Frame Design: Design the disc-lock support frame according to the structural drawings, determine its step distance, span and erection position, and determine the planar position of the frame base at the armpit corner; Step 2, Integrated Design: Based on the position of the frame base determined in Step 1, design the plane position of the reinforcement holes and fixing screws (10) on the angle steel template so that they simultaneously meet the requirements of template reinforcement and subsequent installation of the frame support plate; and design the specifications of the frame support plate assembly; Step 3, Installation of the haunch corner formwork and concrete pouring: Install the haunch corner steel formwork, weld the fixing screw (10) to the main structure steel reinforcement, and then pour the concrete for the slab, haunch corner and lower part of the side wall; Step 4, Removal of formwork and retention of embedded bolts: After the concrete reaches the required strength, remove the angle steel formwork and retain the embedded fixing bolts (10). Step 5, Frame support plate installation: Clean the concrete surface, install the frame support plate assembly on the pre-embedded fixing screw (10), tighten with nuts and level with steel wedges (9); Step 6: Erection of full-span scaffolding: Place the base (1) of the disc-lock scaffolding on the leveled scaffolding support plate (2) and complete the overall erection of the upper full-span support scaffolding.

5. A construction method as described in claim 4, characterized in that: In step 3, the welding of the fixing screw (10) to the main structural steel bar meets the requirements of single-sided welding 10d or double-sided welding 5d, where d is the diameter of the fixing screw (10), and ensures that the fixing screw (10) is perpendicular to the surface of the axle corner concrete.

6. A construction method as described in claim 4, characterized in that: In step 5, the installation of the frame support plate assembly specifically includes: first, inserting the bottom fixing plate (4) into the fixing screw (10) and pressing it against the concrete surface, and initially fixing it with the bottom fixing plate nut (6); then, sequentially installing the lower nut (7) of the upper fixing plate, the upper fixing plate (5), and the upper nut (8) of the upper fixing plate; after adjusting the frame support plate (2) to the horizontal by rotating the rod (3), tightening the upper and lower nuts, and inserting steel wedges (9) into the gap between the strip groove of the upper fixing plate (5) and the fixing screw (10) to enhance stability.

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