Construction method of temporary hole for top formwork support beam

Abstract

The present invention belongs to the field of building construction, and specifically discloses a temporary hole construction method for a top formwork support beam, comprising the following steps: when reserving an opening for placing the support beam, an upper processing space, a lower processing space, and a side processing space are reserved at the top, bottom, and inner wall of the opening side of the opening; then the upper processing space, the lower processing space, and the side processing space are sealed by a sealing member; after the support beam is removed, the sealing member is removed to expose the ends of the steel bars in the upper processing space, the lower processing space, and the side processing space; the steel bars in the upper processing space and the lower processing space are connected by an in-hole reinforcement structure, and the steel bars in the side processing space are extended to the opening of the opening; then the opening and the upper processing space, the lower processing space, and the side processing space are cast to complete the opening sealing, and the in-hole reinforcement structure and the steel bars are all cast inside. The solution of the present invention can solve the problem of insufficient wall strength at the opening.

Description

Technical Field

[0001] The invention belongs to the field of building construction, and particularly relates to a temporary hole-leaving construction method for a top formwork support beam. Background Art

[0002] Core tube top formwork construction technology is widely used in landmark super-high-rise buildings due to its fast construction speed, good safety and high degree of mechanization. Compared with attached and slightly convex support systems, the beam support system used in core tube top formwork construction technology is simple to install and the wall structure has reasonable load-bearing capacity (mainly bearing vertical pressure).

[0003] like Figure 1 As shown, since the beam-type support system includes a support beam 2 that needs to be placed horizontally, an opening 1 needs to be reserved on the wall 3 to place the end of the support beam 2. If the opening 1 is opened in the middle of the wall 3 or other positions that do not affect the subsequent stress of the wall 3, it can be treated as a permanent opening 1. However, in the actual construction process, the position of the opening 1 cannot completely avoid the edge components or the position that affects the subsequent stress of the wall 3. In this case, only a temporary opening 1 can be opened, that is, after the support beam 2 is removed, the temporary opening 1 is poured and filled for restoration.

[0004] In order to ensure the strength of the wall 3, there is usually a steel frame arranged vertically and horizontally (including transverse steel bars and longitudinal steel bars) in the wall 3. When the opening 1 is opened, the steel bars in the opening 1 will inevitably be disconnected to leave a complete opening 1. Therefore, when the opening 1 is subsequently poured and filled, the opening 1 lacks the support of the steel frame, resulting in insufficient strength of the wall 3 at the opening 1. Even if a steel frame corresponding to the size of the opening 1 is placed in the opening 1 and then poured, there will be a problem of insufficient connection strength due to the stratification of the newly poured concrete in the opening 1 and the original concrete of the wall 3. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a temporary hole construction method for a top formwork support beam to solve the problem of insufficient wall strength at the hole opening.

[0006] According to an embodiment of the present invention, the present invention adopts the following technical solutions:

[0007] A temporary hole construction method for a top formwork support beam comprises the following steps: when reserving a hole for placing the support beam, an upper processing space, a lower processing space, and a side processing space are reserved at the top, bottom, and inner wall opposite the hole opening, respectively, and the ends of the steel bars in the wall are extended into the upper processing space, the lower processing space, and the side processing space; then, the upper processing space, the lower processing space, and the side processing space are sealed by a sealant; after the support beam is dismantled, the sealant is removed to expose the ends of the steel bars in the upper processing space, the lower processing space, and the side processing space; the longitudinal steel bars in the upper processing space and the lower processing space are connected by a reinforcement structure in the hole, and the transverse steel bars in the side processing space are extended to the hole opening; then, the hole and the upper processing space, the lower processing space, and the side processing space are cast to complete the hole sealing.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] By reserving upper, lower, and side treatment spaces, the ends of the wall's rebar are exposed. This allows the existing rebar in the wall to connect with the newly poured concrete during the subsequent pouring of the opening, mitigating the problem of insufficient connection strength between the newly poured concrete and the existing wall and ensuring the strength of the wall after pouring. The exposed rebar in the upper, lower, and side treatment spaces does not affect the placement of support beams within the opening, and the installation of seals further reduces the impact on the subsequent construction of the support beams within the opening.

[0010] The reinforcement structure inside the hole connects the longitudinal steel bars in the upper processing space and the lower processing space, and extends the transverse steel bars in the side processing space to the opening of the hole. On the one hand, it is equivalent to setting up a skeleton in the hole to improve the strength of the subsequent concrete poured in the hole; on the other hand, it is connected with the original steel bars in the wall to further improve the connection strength between the newly poured concrete and the original wall.

[0011] Furthermore, in the upper processing space and the side processing space, the sealing members are made of extruded polystyrene boards; in the lower processing space, the sealing member is made of supporting concrete. When the supporting concrete is poured, the longitudinal steel bars exposed in the lower processing space are protected and sealed by protective members.

[0012] Beneficial effects: The seals in the upper processing space and the side processing space are made of extruded polystyrene boards, which are convenient for subsequent removal; and since the seals in the lower processing space will bear the weight after the end of the supporting beam is placed in the opening, in order to ensure a certain supporting strength, the seals in the lower processing space are made of supporting concrete, and protective parts are set to avoid contamination of the steel bars in the lower processing space during the pouring of the supporting concrete, affecting the subsequent connection of the steel bars in the lower processing space with the reinforcement parts, and also avoiding damage to the steel bars in the lower processing space when the supporting concrete is subsequently removed.

[0013] Furthermore, the height of the upper processing space and the lower processing space are both 5d1+50mm, and the width of the side processing space is 10d2+50mm; d1 is the diameter of the longitudinal steel bars in the upper processing space and the lower processing space, and d2 is the diameter of the transverse steel bars in the side processing space.

[0014] Beneficial effects: The dimensions of the upper processing space, the lower processing space, and the side processing space represent the amount of concrete that will enter the upper processing space, the lower processing space, and the side processing space when the opening is subsequently poured. By limiting the relationship between the dimensions of the upper processing space, the lower processing space, and the side processing space and the diameters of the longitudinal and transverse steel bars, the connection strength between the newly poured concrete and the original steel bars in the wall can be guaranteed to a certain extent.

[0015] Furthermore, the reinforcement structure in the hole includes reinforcement parts, which include vertical rods and horizontal rods tied together. The two ends of the vertical rods are respectively connected to the longitudinal steel bars in the upper processing space and the lower processing space, one end of the horizontal rod is connected to the transverse steel bars in the side processing space, and the other end of the horizontal rod extends to the opening of the hole.

[0016] Beneficial effect: The vertical bars and horizontal bars tied together serve as the skeleton of the newly poured concrete in the opening, and the horizontal bars and vertical bars are connected to the original steel bars in the wall, thereby improving the connection strength between the newly poured concrete and the original wall.

[0017] Furthermore, the reinforcement structure in the hole also includes an upper sleeve, a side sleeve and a lower sleeve. The upper sleeve is used to be sleeved and fixed on the longitudinal steel bars in the upper processing space. The side wall of the upper sleeve is provided with an upper groove for the end of the vertical rod to enter. The side sleeve is used to be sleeved on the transverse steel bars in the side processing space. The lower sleeve is used to be sleeved on the longitudinal steel bars in the lower processing space. The side wall of the lower sleeve is provided with a lower groove for the end of the vertical rod to enter. When the reinforcement is placed in the hole, the two ends of the vertical rod enter the upper sleeve and the lower sleeve respectively, and the end of the horizontal rod is also inserted into the side sleeve. Then the lower sleeve is rotated so that the lower groove is aligned with the side processing space.

[0018] Beneficial effect: The arrangement of the upper sleeve, the lower sleeve and the side sleeve has a certain limiting effect on the horizontal bar and the vertical bar, which, to a certain extent, prevents the reinforcement from moving during the subsequent pouring of concrete.

[0019] Furthermore, the end of the horizontal rod facing the side sleeve and both ends of the vertical rod are provided with a clamping groove with an isosceles triangle longitudinal section, the ends of the longitudinal steel bars in the upper processing space and the lower processing space, and the ends of the transverse steel bars in the side processing space are provided with clamping parts that engage with the clamping groove; the vertical rod is provided with an adjustment part for adjusting the length of the vertical rod.

[0020] Beneficial Effects: The coupling groove and the coupling portion restrict radial movement of the horizontal and vertical bars, further preventing movement of the reinforcement during subsequent concrete pouring and subsequent wall pressure, thereby improving the strength of the wall. The adjustment portion facilitates placement of the vertical bar into the opening and its alignment with the longitudinal reinforcement in the upper and lower processing spaces.

[0021] Furthermore, a group of mutually cooperating clamping grooves and clamping parts are provided with first through holes that are interconnected.

[0022] Beneficial effect: The poured concrete passes through the first through hole, and after the concrete solidifies, the clamping groove and the clamping part can be fixed, reducing the problem of insufficient connection strength that may be caused by the lack of initial connection between the two.

[0023] Furthermore, the horizontal rod and the vertical rod are both provided with second through holes along their radial directions.

[0024] Beneficial effect: The poured concrete passes through the second through hole, and after the concrete solidifies, it can be more firmly connected to the horizontal rod and the vertical rod, and has a limiting effect on the horizontal rod and the vertical rod along their axial direction, further improving the skeleton support strength of the reinforcement in the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the hole-retaining structure for the top formwork support beam in the background technology of the present invention.

[0026] Figure 2 Schematic diagram of the construction status of step S2 in an embodiment of the present invention.

[0027] Figure 3 for Figure 2 Enlarged view of part A.

[0028] Figure 4 Schematic diagram of the construction status of step S4 in an embodiment of the present invention.

[0029] Figure 5 for Figure 4 Magnified view of part B.

[0030] Figure 6 for Figure 4 Magnified view of part C.

[0031] Figure 7 Schematic diagram of the construction status of step S5 in an embodiment of the present invention.

[0032] In the figure: 1. Opening; 2. Support beam; 3. Wall; 4. Longitudinal reinforcement; 5. Transverse reinforcement; 6. Extruded polystyrene board; 7. Upper processing space; 8. Supporting concrete; 9. PVC casing; 10. PE film; 11. Side processing space; 12. Lower processing space; 13. Vertical bar; 14. Horizontal bar; 15. Side casing; 16. Upper casing; 17. Upper groove; 18. Lower casing; 19. Lower groove; 20. Second through hole; 21. First through hole; 22. Clamping part; 23. Slide; 24. Connecting hole; 25. First section; 26. Second section; 27. Side formwork; 28. Feed port. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings, and specific implementation methods will be given.

[0034] like Figure 2 、 Figure 4 As shown, the temporary hole construction method for the top form support beam includes the following steps:

[0035] S1. When reserving an opening 1 for placing the support beam 2, an upper processing space 7, a lower processing space 12, and a side processing space 11 are reserved at the top of the opening 1, the bottom of the opening 1, and the inner wall opposite the opening side of the opening 1, respectively. The ends of the steel bars in the wall 3 extend to the upper processing space 7, the lower processing space 12, and the side processing space 11. Specifically, the ends of the transverse steel bars 5 in the wall 3 extend to the side processing space 11, the lower ends of the longitudinal steel bars 4 in the upper part of the wall 3 extend to the upper processing space 7, and the upper ends of the longitudinal steel bars 4 in the lower part of the wall 3 extend to the lower processing space 12.

[0036] The heights of the upper processing space 7 and the lower processing space 12 are both 5d1+50mm, and the width of the side processing space 11 is 10d2+50mm; d1 is the diameter of the longitudinal steel bars 4 in the upper processing space 7 and the lower processing space 12, and d2 is the diameter of the transverse steel bars 5 in the side processing space 11. By limiting the relationship between the dimensions of the upper processing space 7, the lower processing space 12, and the side processing space 11 and the diameters of the longitudinal steel bars 4 and the transverse steel bars 5, the connection strength between the newly poured concrete and the original steel bars in the wall 3 is guaranteed to a certain extent.

[0037] S2. Seal the upper processing space 7, the lower processing space 12, and the side processing space 11 with seals. Specifically, the seals in the upper processing space 7 and the side processing space 11 are made of extruded polystyrene boards 6, that is, the extruded polystyrene boards 6 are filled into the upper processing space 7 and the side processing space 11. The seals in the lower processing space 12 are made of supporting concrete 8. When pouring the supporting concrete 8, the exposed steel bars in the lower processing space 12 are protected and sealed by protective members to prevent the poured supporting concrete 8 from contaminating the steel bars in the lower processing space 12. Specifically, Figure 3As shown, the protective part is a PVC sleeve 9, the length of the PVC sleeve 9 is equal to the height of the lower processing space 12, the PVC sleeve 9 is sleeved on the longitudinal steel bar 4 in the lower processing space 12, and then the opening at the top of the PVC sleeve 9 is sealed by a PE film 10, and the gap between the bottom of the PVC sleeve 9 and the bottom wall of the lower processing space 12 is sealed by the PE film 10 to prevent the supporting concrete 8 from entering the PVC sleeve 9.

[0038] S3. After the support beam 2 is removed, the sealant is removed to expose the ends of the steel bars in the upper processing space 7, the lower processing space 12 and the side processing space 11. Specifically, the extruded polystyrene board 6 in the upper processing space 7 and the side processing space 11 is removed. The extruded polystyrene board 6 is a foam board and is easy to remove. Then, the supporting concrete 8 poured in the lower processing space 12 is smashed away using the concrete smashing tool in the prior art. The PVC sleeve 9 is also taken out from the lower processing space 12 along with the smashed supporting concrete 8.

[0039] S4. Combination Figure 4 As shown, the steel bars in the upper processing space 7 and the lower processing space 12 are connected by the in-hole reinforcement structure, and the steel bars in the side processing space 11 are extended to the opening of the hole 1. Specifically, the in-hole reinforcement structure includes a reinforcement member, and the reinforcement member includes a vertical rod 13 and a horizontal rod 14 tied together. The two ends of the vertical rod 13 are respectively connected to the longitudinal steel bars 4 in the upper processing space 7 and the lower processing space 12, and one end of the horizontal rod 14 is connected to the transverse steel bars 5 in the side processing space 11, and the other end of the horizontal rod 14 extends to the opening of the hole 1. In this embodiment, the vertical rod 13 is selected from steel bars with the same specifications as the longitudinal steel bars 4 in the upper processing space 7 and the lower processing space 12, and the two ends of the vertical rod 13 are respectively welded to the longitudinal steel bars 4 in the upper processing space 7 and the lower processing space 12 by means of lap welding. The horizontal rod 14 is selected from steel bars with the same specifications as the transverse steel bars 5 in the side processing space 11, and the horizontal rod 14 is welded to the transverse steel bars 5 in the side processing space 11 by means of lap welding.

[0040] S5. Combination Figure 7 As shown, the hole 1 and the upper processing space 7, the lower processing space 12, and the side processing space 11 are cast to complete the sealing of the hole 1, and the reinforcement structure and steel bars in the hole are all cast inside. Specifically, the casting method can refer to the method of casting structural columns in the existing technology. A side formwork 27 is set to block the opening of the hole 1, and a feed port 28 is left at the upper end of the side formwork 27 for casting. After the strength of the poured concrete reaches the demoulding conditions, the side formwork 27 can be removed.

[0041] In another embodiment of the present invention, the horizontal bars 14 and vertical bars 13 are not directly connected to the existing steel bars in the wall 3 by welding. Due to the vertical and horizontal distribution of the existing steel bars in the wall 3, welding the horizontal bars 14 and vertical bars 13 to the wall 3 would result in a small operating space and increase the difficulty of operation. Therefore, the following improvements are made in this embodiment:

[0042] Combine Figure 4 、 Figure 5 、 Figure 6 As shown, the reinforcement structure in the hole also includes an upper sleeve 16, a side sleeve 15 and a lower sleeve 18. The upper sleeve 16 is used to be sleeved and fixed on the longitudinal steel bar 4 in the upper processing space 7. The side wall of the upper sleeve 16 is provided with an upper groove 17 for the end of the vertical rod 13 to enter. The side sleeve 15 is used to be sleeved on the transverse steel bar 5 in the side processing space 11. The lower sleeve 18 is used to be sleeved on the longitudinal steel bar 4 in the lower processing space 12. The side wall of the lower sleeve 18 is provided with a lower groove 19 for the end of the vertical rod 13 to enter. The side sleeve 15 and the lower sleeve 18 can be directly sleeved on the corresponding steel bars. First, the lower groove 19 on the lower sleeve 18 is facing the opening side of the hole 1. The upper sleeve 16 is sleeved on the longitudinal steel bar 4 of the upper processing space 7 so that the upper groove 17 on the upper sleeve 16 faces the opening side of the hole 1. Then, the upper sleeve 16 and the corresponding steel bar are welded together. The inner diameters of the upper and lower sleeves 16 and 18 are larger than the outer diameters of the longitudinal steel bars 4 in the upper and lower processing spaces 7 and 12 , and the inner diameter of the side sleeve 15 is larger than the outer diameter of the transverse steel bars 5 in the side processing space 11 .

[0043] When the reinforcement piece is placed in the hole 1, the two ends of the vertical rod 13 enter the upper sleeve 16 and the lower sleeve 18 through the upper groove 17 and the lower groove 19 respectively, and the end of the cross bar 14 is also inserted into the side sleeve 15. Then, the lower sleeve 18 is rotated so that the lower groove 19 is aligned with the side processing space 11. Figure 7 At this point, the upper sleeve 16, lower sleeve 18, and side sleeve 15 provide a certain degree of positional restraint on the horizontal bar 14 and vertical bar 13, preventing the reinforcing member from shifting during subsequent concrete pouring. After the concrete is poured, the concrete entering the upper sleeve 16, lower sleeve 18, and side sleeve 15 securely connects the reinforcing member to the existing steel bars in the wall 3.

[0044] In another embodiment of the present invention, Figure 4 、 Figure 5 、 Figure 6As shown, the end of the horizontal rod 14 facing the side sleeve and the two ends of the vertical rod 13 are provided with a clamping groove with an isosceles triangle longitudinal section, and the ends of the longitudinal steel bars 4 in the upper processing space 7 and the lower processing space 12, and the ends of the transverse steel bars 5 in the side processing space 11 are provided with a clamping portion 22 that is engaged with the clamping groove. Through the cooperation of the clamping groove and the clamping portion 22, the radial movement of the horizontal rod 14 and the vertical rod 13 is restricted to a certain extent, further avoiding the movement of the reinforcement parts during the subsequent pouring of concrete and the subsequent pressure of the wall 3, thereby improving the strength of the wall 3 to a certain extent.

[0045] To facilitate placement of the vertical rod 13 into the opening 1 and coordination with the longitudinal reinforcement 4 in the upper processing space 7 and the lower processing space 12, the vertical rod 13 is provided with an adjustment portion for adjusting the length of the vertical rod 13. Specifically, the vertical rod 13 includes a first section 25 and a second section 26. The adjustment portion includes a slide 23. The first section 25 is fixed to the slide 23, and the second section 26 is slidably connected to the slide 23. By sliding the slide 23, the spacing between the first section 25 and the second section 26 is adjusted, thereby completing the length adjustment of the vertical rod 13. To facilitate stability after relative sliding between the second section 26 and the slide 23, the outer wall of the second section 26 and the inner wall of the slide 23 are roughened and frosted using existing technology to increase friction between the second section 26 and the slide 23. In actual use, a connecting hole 24 is opened on the side wall of the slide 23. Concrete poured subsequently can enter the slide 23 through the connecting hole 24, further limiting the relative position of the second section 26 and the slide 23.

[0046] In another embodiment of the present invention, Figure 4 、 Figure 5 、 Figure 6 As shown, a pair of cooperating snap-fit ​​grooves and snap-fit ​​portions 22 are provided with interconnected first through-holes 21, and both the horizontal bar 14 and the vertical bar 13 are provided with second through-holes 20 along their radial directions. Concrete is poured through the first through-holes 21 and the second through-holes 20. Once the concrete solidifies, the snap-fit ​​grooves and snap-fit ​​portions 22 are secured, while also limiting the horizontal bar 14 and the vertical bar 13 in their axial directions, thereby enhancing the connection strength.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A temporary hole construction method for top formwork support beams, characterized in that: The following steps are involved: When reserving an opening for placing a support beam, an upper processing space, a lower processing space, and a side processing space are reserved at the top and bottom of the opening, and on the inner wall opposite the opening. The ends of the steel bars in the wall extend into the upper processing space, the lower processing space, and the side processing space; then, the upper processing space, the lower processing space, and the side processing space are sealed with a sealant. After the support beams are removed, the seals are removed to expose the ends of the steel bars in the upper, lower, and side processing spaces. The longitudinal steel bars in the upper and lower processing spaces are connected through the in-hole reinforcement structure, and the transverse steel bars in the side processing spaces are extended to the hole opening. The hole opening and the upper, lower, and side processing spaces are then cast to complete the hole sealing. The reinforcement structure in the hole includes reinforcement parts, and the reinforcement parts include vertical rods and horizontal rods tied together. The two ends of the vertical rods are respectively connected to the longitudinal steel bars in the upper processing space and the lower processing space, one end of the horizontal rod is connected to the transverse steel bars in the side processing space, and the other end of the horizontal rod extends to the opening of the hole; the reinforcement structure in the hole also includes an upper casing, a side casing and a lower casing. The upper casing is used to be sleeved and fixed on the longitudinal steel bars in the upper processing space, and the side wall of the upper casing is provided with an upper groove for the end of the vertical rod to enter, the side casing is used to be sleeved on the transverse steel bars in the side processing space, and the lower casing is used to be sleeved on the longitudinal steel bars in the lower processing space, and the side wall of the lower casing is provided with a lower groove for the end of the vertical rod to enter, and the inner diameters of the upper casing and the lower casing are large. The outer diameter of the longitudinal steel bars in the upper processing space and the lower processing space and the inner diameter of the side sleeve are larger than the outer diameter of the transverse steel bars in the side processing space; when the reinforcement is placed in the opening, the two ends of the vertical rod enter the upper sleeve and the lower sleeve respectively, and the end of the cross rod is also inserted into the side sleeve, and then the lower sleeve is rotated so that the lower groove is aligned with the side processing space; the end of the cross rod facing the side sleeve and the two ends of the vertical rod are provided with a clamping groove with an isosceles triangle longitudinal section, the ends of the longitudinal steel bars in the upper processing space and the lower processing space and the ends of the transverse steel bars in the side processing space are provided with a clamping part that is clamped with the clamping groove, and a group of clamping grooves and clamping parts that cooperate with each other are provided with a first through hole that is interconnected; the vertical rod is provided with an adjustment part for adjusting the length of the vertical rod.

2. The temporary hole construction method for top form support beam according to claim 1, characterized in that: In the upper processing space and the side processing space, the sealing members are made of extruded polystyrene boards; in the lower processing space, the sealing member is made of supporting concrete. When the supporting concrete is poured, the longitudinal steel bars exposed in the lower processing space are protected and sealed by protective members.

3. The temporary hole construction method for top form support beam according to claim 1, characterized in that: The height of the upper processing space and the lower processing space are both 5d1+50mm, and the width of the side processing space is 10d2+50mm; d1 is the diameter of the longitudinal steel bars in the upper processing space and the lower processing space, and d2 is the diameter of the transverse steel bars in the side processing space.

4. The temporary hole construction method for top form support beam according to claim 1, characterized in that: The horizontal rod and the vertical rod are both provided with second through holes along their radial directions.

Images