Post-cast strip cantilever support structure and multi-layer post-cast strip cantilever
Patent Information
- Application Number
- CN202522114275.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-09-30
AI Technical Summary
[0004]为解决上述问题，出现了采用永久性混凝土柱作为后浇带支撑的方案，即在主体结构浇筑时，同步浇筑混凝土支撑柱，然而，在浇筑直径较小的混凝土支撑柱时，混凝土从高处落下易发生离析，骨料与砂浆分离，导致成型后的混凝土柱强度不均，甚至存在薄弱层，无法满足设计支撑强度要求，给结构安全带来巨大隐患
该结构通过插槽和控流片的简易配合即可能有效减缓混凝土浇筑时的下落速度，防止混凝土离析，保证了混凝土支撑柱强度；该结构通过底部预埋筋和顶部锚固筋的双重定位与锚固，确保了空心管在浇筑过程中不会发生移动，有效防止了混凝土支撑柱的施工偏位，保证了混凝土支撑柱的对中性；该结构中，空心管及插槽、底部预埋筋、顶部锚固筋、控流片均可预先制作，无需额外工序，节省了大量周转材料和人工，经济效益显著。
Smart Images
Figure CN224785350U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of building construction, specifically relating to a post-cast strip cantilever support structure and a multi-layer post-cast strip cantilever. Background Technology
[0002] In cast-in-place reinforced concrete construction, post-pouring strips are often set to prevent harmful cracks that may be caused by uneven temperature and shrinkage in the cast-in-place reinforced concrete structure. The formwork and supports at the post-pouring strip need to be retained after the main structure is demolished, and can only be removed after the post-pouring strip concrete is poured and reaches the required strength.
[0003] For structures with cantilever beams and slabs, the reliability and safety of the post-cast strip cantilever support structure are crucial. Traditionally, a large amount of scaffolding or temporary support structures are used, which not only increases construction costs but also extends the construction period.
[0004] To address these issues, a solution has emerged using permanent concrete columns as post-cast strip supports. This involves simultaneously casting concrete support columns during the main structure's pouring. However, when casting concrete support columns with smaller diameters, the concrete is prone to segregation as it falls from a height, causing the aggregate to separate from the mortar. This results in uneven strength in the cast concrete columns, and even the presence of weak layers, failing to meet the design support strength requirements and posing a significant threat to structural safety. Utility Model Content
[0005] The purpose of this utility model is to provide a post-pouring strip cantilever support structure and a multi-layer post-pouring strip cantilever including the above structure. This structure can effectively slow down the falling speed of concrete during pouring, prevent concrete segregation, and effectively prevent the construction deviation of concrete support columns.
[0006] The technical solution adopted in this utility model is: A post-cast strip cantilever support structure includes a hollow tube located below the cantilever of the post-cast strip; the lower end of the hollow tube is connected to a base slab, and a bottom embedded bar is provided at the lower end of the hollow tube. The lower part of the bottom embedded bar is embedded in the base slab, and the upper part extends into the lower end of the hollow tube to limit the lower end of the hollow tube. The interior of the hollow tube is integrally cast with the base slab to form a concrete support column; the upper end of the hollow tube is connected to a top slab, and a top anchor bar is provided at the upper end of the hollow tube. The upper part of the top anchor bar is embedded in the top slab, and the lower part is inserted into the upper end of the concrete support column; a slot is provided on the hollow tube, and a flow control plate for slowing down the falling speed of concrete during pouring is inserted into the slot. The area of the flow control plate extending into the hollow tube is adjustable.
[0007] Preferably, the hollow tube is located near the end of the post-cast strip cantilever.
[0008] Preferably, the hollow tube is made of PVC pipe.
[0009] Preferably, the hollow tube has multiple slots along its vertical line, and a flow control plate is inserted into each slot.
[0010] Preferably, adjacent slots are staggered.
[0011] Preferably, the slot is opened in a horizontal or slightly upward angle.
[0012] Preferably, the flow control plate is made of metal.
[0013] Preferably, the length of the bottom embedded rib extending into the hollow tube is greater than the depth of the embedded rib in the base plate.
[0014] Preferably, the length of the top anchor bar inserted into the concrete support column is greater than the depth of its embedment in the top slab.
[0015] A multi-layer post-cast strip cantilever, wherein each layer of post-cast strip cantilever adopts the above-mentioned post-cast strip cantilever support structure, and the center lines of the concrete support columns of each layer coincide.
[0016] The beneficial effects of this utility model are: This structure, through the simple combination of slots and flow control plates, can effectively slow down the falling speed of concrete during pouring, prevent concrete segregation, and ensure the strength of the concrete support column. The dual positioning and anchoring of the bottom embedded bars and top anchor bars ensures that the hollow tube will not move during pouring, effectively preventing construction deviation of the concrete support column and ensuring its centering. In this structure, the hollow tube, slots, bottom embedded bars, top anchor bars, and flow control plates can all be prefabricated without additional processes, saving a significant amount of reusable materials and labor, resulting in substantial economic benefits. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the cantilever support structure of the post-cast strip in Embodiment 1 of this utility model.
[0018] Figure 2 This is a schematic diagram of the installation of the hollow tube and flow control plate in Embodiment 1 of this utility model.
[0019] Figure 3 This is a partial detail view of the hollow tube and flow control plate in Embodiment 1 of this utility model.
[0020] Figure 4 This is an exploded view of the hollow tube and flow control plate in Embodiment 1 of this utility model.
[0021] Figure 5 This is a schematic diagram of the multi-layer post-cast strip cantilever in Embodiment 2 of this utility model.
[0022] In the diagram: 1-Top slab; 2-Post-cast strip cantilever; 3-Top anchor bar; 4-Concrete support column; 5-Hollow tube; 6-Bottom embedded bar; 7-Base slab; 8-Flow control plate; 9-Slot. Detailed Implementation
[0023] The present application will be further described below with reference to the accompanying drawings and embodiments.
[0024] Example 1 This embodiment discloses a post-cast strip cantilever support structure, such as Figures 1 to 4 As shown: It includes a hollow tube 5, a bottom embedded bar 6, a top anchor bar 3, and a flow control plate 8; the hollow tube 5 is located below the cantilever 2 of the post-cast strip, the lower end of the hollow tube 5 is connected to the bottom plate 7, and the upper end of the hollow tube 5 is connected to the top plate 1; the bottom embedded bar 6 is located at the lower end of the hollow tube 5, the lower part of the bottom embedded bar 6 is embedded in the bottom plate 7, and the upper part extends into the lower end of the hollow tube 5 to limit the lower end of the hollow tube 5. The interior of the hollow tube 5 is integrally cast with the bottom plate 7 to form a concrete support column 4; the top anchor bar 3 is located at the upper end of the hollow tube 5, the upper part of the top anchor bar 3 is embedded in the top plate 1, and the lower part is inserted into the upper end of the concrete support column 4; a slot 9 is opened on the hollow tube 5, and the flow control plate 8 is inserted into the slot 9. The area of the flow control plate 8 extending into the hollow tube 5 is adjustable. The flow control plate 8 is used to slow down the falling speed of the concrete during pouring.
[0025] During construction: First, determine the position of the hollow tube 5 according to the design and stress conditions. Then, install the lower formwork and bottom plate reinforcement. Embed the lower part of the bottom pre-embedded reinforcement 6 in the bottom plate 7 and expose the upper part. Fit the lower end of the hollow tube 5 onto the bottom pre-embedded reinforcement 6, correct the verticality and reinforce it. Insert the flow control plate 8 into the slot 9. Then, pour the hollow tube 5 and the bottom plate 7 together. Adjust the area of the flow control plate 8 extending into the hollow tube 5 to control the falling speed of the concrete inside the hollow tube 5, so that the concrete falls slowly and prevents the concrete segregation. After the concrete support column 4 is stable, install the upper formwork and top plate reinforcement. Embed the upper part of the top anchoring reinforcement 3 in the top plate 1 and insert the lower part into the upper end of the poured concrete support column 4 to achieve secondary anchoring and positioning.
[0026] This structure, through the simple combination of slot 9 and flow control plate 8, can effectively slow down the falling speed of concrete during pouring, prevent concrete segregation, and ensure the strength of the concrete support column 4. The structure, through the dual positioning and anchoring of the bottom embedded reinforcement 6 and the top anchoring reinforcement 3, ensures that the hollow tube 5 will not move during pouring, effectively preventing construction deviation of the concrete support column 4 and ensuring its centering. In this structure, the hollow tube 5, slot 9, bottom embedded reinforcement 6, top anchoring reinforcement 3, and flow control plate 8 can all be prefabricated without additional procedures, saving a significant amount of turnover materials and labor, resulting in substantial economic benefits.
[0027] In this embodiment, preferably, as follows: Figure 1 As shown, the hollow tube 5 is located near the end of the post-cast strip cantilever 2, which avoids excessive cantilever length. In this embodiment, the hollow tube 5 is located 200mm inside the end of the post-cast strip cantilever 2.
[0028] In this embodiment, the hollow tube 5 is preferably made of PVC pipe, which has reliable strength, is easy to process, and has low cost.
[0029] In this embodiment, preferably, as follows: Figure 2 , Figure 4 As shown, the hollow tube 5 has multiple slots 9 vertically arranged along its length. Each slot 9 contains a current control plate 8, and multiple current control plates 8 can be connected in series to limit the current, resulting in a better current limiting effect. In this embodiment, the three slots 9 are evenly spaced.
[0030] In this embodiment, preferably, as follows: Figure 2 , Figure 4 As shown, adjacent slots 9 are staggered, and each time a current control chip 8 passes through, it will be effectively blocked, resulting in better current limiting.
[0031] In this embodiment, preferably, the slot 9 is opened in a horizontal or slightly upward tilted direction to prevent the flow control plate 8 from falling off.
[0032] The flow control plate 8 is preferably made of metal. In this embodiment, the hollow tube 5 has an inner diameter of 250 mm, the slot is 2 mm thick, and the flow control plate 8 is circular with a thickness of 2 mm and a diameter of 300 mm.
[0033] In this embodiment, preferably, the length of the bottom embedded bar 6 extending into the hollow tube 5 is greater than the depth of its embedment in the base plate 7. In this embodiment, the bottom embedded bar 6 is an HRB400 grade steel bar with a diameter of 14mm, and its embedment depth is 100mm, with a length of 150mm inside the hollow tube 5.
[0034] In this embodiment, preferably, the length of the top anchor bar 3 inserted into the concrete support column 4 is greater than the depth of its embedment in the top slab 1. In this embodiment, the top anchor bar 3 is an HRB400 grade steel bar with a diameter of 14mm, its embedment depth is 150mm, and its length inserted into the concrete support column 4 is 300mm.
[0035] Example 2 This embodiment discloses a multi-layer post-cast strip cantilever, such as Figure 5 As shown, each layer of post-cast strip cantilever 2 adopts the above-mentioned post-cast strip cantilever support structure, and the center lines of the concrete support columns 4 of each layer coincide. This arrangement allows the concrete support columns 4 of each layer to bear continuous force, ensuring effective transmission of support force and improving the overall stiffness and stability of the support system. Ideally, the concrete support columns 4 of each layer should be completely aligned vertically. If complete alignment is not possible for various reasons, the center lines should still be ensured to coincide.
[0036] During construction: First, determine the position of the hollow tube 5 according to the design and stress conditions; then install the lower formwork and bottom plate reinforcement, embed the lower part of the bottom pre-embedded reinforcement 6 in the bottom plate 7 with the upper part exposed, put the lower end of the hollow tube 5 on the bottom pre-embedded reinforcement 6, correct the verticality and reinforce it, and insert the flow control plate 8 into the slot 9; then pour the interior of the hollow tube 5 and the bottom plate 7 together, and adjust the area of the flow control plate 8 extending into the hollow tube 5 to control the falling speed of the concrete inside the hollow tube 5, so that the concrete falls slowly, thereby preventing concrete segregation; after the concrete support column 4 is stable, install the upper formwork and top plate reinforcement, embed the upper part of the top anchoring reinforcement 3 in the top plate 1 and insert the lower part into the upper end of the poured concrete support column 4 to achieve secondary anchoring and positioning; construct layer by layer upwards in this way to ensure that the center lines of the concrete support columns 4 of each layer coincide, and together form a stable and reliable support system until the post-pouring strip construction is completed.
[0037] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
Claims
1. A post-cast strip cantilever support structure, characterized in that: It includes a hollow tube located below the cantilever of the post-cast strip; the lower end of the hollow tube is connected to the base slab, and a bottom embedded bar is set at the lower end of the hollow tube. The lower part of the bottom embedded bar is embedded in the base slab, and the upper part extends into the lower end of the hollow tube to limit the lower end of the hollow tube. The interior of the hollow tube is integrally cast with the base slab to form a concrete support column; the upper end of the hollow tube is connected to the top slab, and a top anchor bar is set at the upper end of the hollow tube. The upper part of the top anchor bar is embedded in the top slab, and the lower part is inserted into the upper end of the concrete support column; a slot is opened on the hollow tube, and a flow control plate is inserted into the slot to slow down the falling speed of the concrete during pouring. The area of the flow control plate extending into the hollow tube is adjustable.
2. The cantilever support structure for post-cast strips as described in claim 1, characterized in that: The hollow tube is located near the end of the post-cast strip cantilever.
3. The cantilever support structure for post-cast strips as described in claim 1, characterized in that: The hollow tubes are made of PVC.
4. The cantilever support structure for post-cast strips as described in claim 1, characterized in that: The hollow tube has multiple slots along its vertical line, and a flow control plate is inserted into each slot.
5. The cantilever support structure for post-cast strips as described in claim 4, characterized in that: Adjacent slots are staggered.
6. The cantilever support structure for post-cast strips as described in claim 1, characterized in that: The slots are opened horizontally or tilted slightly upwards.
7. The cantilever support structure for post-cast strips as described in claim 1, characterized in that: The flow control plate is made of metal.
8. The cantilever support structure for post-cast strips as described in claim 1, characterized in that: The length of the bottom embedded reinforcement extending into the hollow tube is greater than the depth of the embedded reinforcement in the base plate.
9. The cantilever support structure for post-cast strips as described in claim 1, characterized in that: The length of the top anchor bar inserted into the concrete support column is greater than the depth of its embedment in the top slab.
10. A multi-layer post-cast strip cantilever, characterized in that: Each layer of post-cast strip cantilever adopts the post-cast strip cantilever support structure as described in any one of claims 1 to 9, and the center lines of the concrete support columns of each layer coincide.