A post-pour hole plugging system
By prefabricating U-shaped steel bars in the post-cast holes and combining them with prefabricated sealing plates, and by applying water-swellable sealant at the joints, the corrosion problem of steel sealing plates was solved, and the durability and connection stability of the concrete filling layer were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA RAILWAY CONSTR
- Filing Date
- 2025-06-16
- Publication Date
- 2026-06-05
AI Technical Summary
In existing post-pouring hole sealing technologies, steel sealing plates are easily corroded, and connecting steel bars rust, resulting in poor durability of the concrete filling layer and a lack of effective waterproofing measures.
U-shaped steel bars are prefabricated together with precast sealing plates, and water-swellable sealant is applied at the joints to form a barrier and prevent air from corroding the U-shaped steel bars.
It effectively prevents air corrosion of U-shaped steel bars and improves the durability and connection stability of the concrete filling layer.
Smart Images
Figure CN224325898U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of building construction technology, specifically relating to a post-cast hole sealing system. Background Technology
[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.
[0003] During the construction of multi-story buildings, at least two layout holes need to be reserved on each floor to bring up the axis lines of the floors below for layout work on that floor. Additionally, in high-rise buildings, pump pipe holes are also reserved between floors. Furthermore, material handling holes are sometimes reserved between floors in some municipal construction projects.
[0004] The aforementioned marking holes, pump pipe holes, and material discharge holes are all post-cast holes, which need to be sealed in the later stages of construction. Current techniques for sealing post-cast holes typically involve setting up a formwork at the bottom of the hole, supporting it with timber at the bottom of the formwork, and then pouring concrete inside the formwork. However, the formwork and timber deform after repeated use, leading to grout leakage and misalignment during pouring, resulting in poor finishing.
[0005] To address the aforementioned issues, existing patents disclose a sealing system for post-cast holes, comprising a discharge hole, a cross-shaped groove at the top of the plate containing the discharge hole with reinforcing bars inside the groove, a steel sealing plate at the bottom of the discharge hole, the sealing plate being connected to the reinforcing bars inside the groove via connecting steel bars, concrete being filled between the sealing plate and the discharge hole, and a waterproof coating layer being applied between the discharge hole and the filling concrete before filling the concrete.
[0006] The above solution uses steel sealing plates and connecting steel bars as formwork, overcoming the problem of deformation that occurs over time with traditional formwork and timber. However, the above solution still has the following problems:
[0007] The steel sealing plate is used as the bottom formwork to connect with the reinforcing bars. The steel sealing plate is exposed to the outside and is easily corroded by moisture in the air. In addition, there is no waterproofing between the concrete filling layer and the sealing plate, which eventually leads to the reinforcing bars being corroded by moisture in the air, reducing the load-bearing capacity of the reinforcing bars, causing cracks in the concrete filling layer, and ultimately affecting the durability of the concrete filling layer. Utility Model Content
[0008] To address the aforementioned problems, this utility model provides a post-pouring hole sealing system. This system involves prefabricating U-shaped reinforcing bars and precast sealing plates together, and then placing the precast sealing plates inside the post-pouring hole, allowing the precast sealing plates to protect the U-shaped reinforcing bars from the bottom. Water-swellable sealant is applied at the joint between the top of the filling layer and the floor slab, as well as at the joint between the post-pouring hole and the precast sealing plate. When the filling layer is poured, the moisture from the replenishing shrinkage concrete in the filling layer causes the water-swellable sealant to expand, forming a barrier at the joint and preventing air from penetrating and corroding the U-shaped reinforcing bars.
[0009] To achieve the above objectives, the present invention adopts the following technical solution:
[0010] A post-cast hole sealing system includes a floor slab with pre-reserved post-cast holes, a precast sealing plate installed in the post-cast holes, the bottom surface of the precast sealing plate being flush with the bottom surface of the floor slab, a grid groove being provided on the top of the floor slab, and upper reinforcing bars being installed in the grid groove.
[0011] Multiple U-shaped steel bars are arranged in a horizontal and vertical alternating manner at the bottom of the precast sealing plate and are precast together with the precast sealing plate; the precast sealing plate is fixed to the upper steel bars by welding the U-shaped steel bars;
[0012] A filling layer is poured into the post-pouring hole and the grid groove to connect with the floor slab; water-stop sealant is applied at the joint between the top of the filling layer and the floor slab, as well as at the joint between the post-pouring hole and the precast sealing plate.
[0013] Preferably, the precast sealing plate is a precast hollow concrete slab with a cavity in the center; multiple U-shaped steel bars are arranged in a horizontal and vertical alternating manner at the bottom of the precast sealing plate and are precast together with the precast sealing plate.
[0014] Preferably, the top surface of the precast sealing plate is lower than the top surface of the floor slab; the length of the U-shaped steel bar is greater than the height of the post-cast hole, and the U-shaped steel bar is bent and anchored after extending out of the post-cast hole to form a bent anchor part, which is welded and fixed to the upper steel bar.
[0015] Preferably, the grid-shaped groove is centered on the center of the post-cast hole, and includes two horizontal grooves and two vertical grooves, both of which are interrupted by the post-cast hole.
[0016] Preferably, the transverse or longitudinal grooves are provided with bevels at the ends far from the post-cast holes, and the length of the bevels is equal to the bending anchorage length of the U-shaped steel bars.
[0017] Preferably, the upper reinforcing bar is exposed in the groove of the transverse or longitudinal groove away from the bevel, and its length is greater than the bending anchor length of the U-shaped reinforcing bar, so that the bending anchor part is completely welded to the upper reinforcing bar.
[0018] Preferably, reinforcing bars are placed parallel to the upper reinforcing bars in the transverse or longitudinal groove.
[0019] Preferably, the filling layer includes shrinkage-compensating concrete, which is poured and filled in the post-cast holes and the grid grooves, and the top surface of the shrinkage-compensating concrete is lower than the top surface of the floor slab by a set distance.
[0020] Preferably, a waterproof coating is applied to the top surface of the shrinkage-compensating concrete, and waterproof mortar is applied on top of the waterproof coating, with the top surface of the waterproof mortar flush with the top surface of the floor slab.
[0021] Preferably, a horizontal groove is provided on the top of the precast sealing plate, and multiple circumferential grooves are provided on the circumferential sidewalls. The horizontal groove is located on the outside of the U-shaped steel bar. Water-stopping adhesive is embedded in both the horizontal groove and the circumferential groove.
[0022] Compared with the prior art, the advantages and positive effects of this utility model are:
[0023] This invention prefabricates U-shaped reinforcing bars and precast sealing plates together, and places the precast sealing plates inside the post-cast holes, so that the precast sealing plates can protect the U-shaped reinforcing bars from the bottom. By applying water-swellable sealant at the joint between the top of the filling layer and the floor slab, and at the joint between the post-cast hole and the precast sealing plate, when the filling layer is poured, the water in the supplementary shrinkage concrete in the filling layer causes the water-swellable sealant to expand, which can form a barrier at the joint and prevent air from penetrating through the joint and corroding the U-shaped reinforcing bars. Attached Figure Description
[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.
[0025] Figure 1 This is a cross-sectional view of the post-cast hole sealing system according to an embodiment of the present invention;
[0026] Figure 2 This is a cross-sectional view of the prefabricated sealing plate according to an embodiment of the present utility model;
[0027] Figure 3 This is a top view of the floor slab according to an embodiment of the present utility model;
[0028] In the picture:
[0029] 1. Precast sealing plate; 11. Cavity; 12. Circumferential groove; 13. Horizontal groove; 14. Water-stop adhesive; 15. Structural adhesive; 2. U-shaped steel bar; 3. Post-cast hole; 4. Filling layer; 41. Shrinkage-compensating concrete; 42. Waterproof mortar; 5. Grid groove; 51. Bevel; 6. Floor slab; 61. Top reinforcement; 62. Reinforcing steel bar. Detailed Implementation
[0030] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0031] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a post-casting hole sealing system, such as... Figure 1 As shown, the system includes a floor slab 6 with a pre-cast hole 3. A precast sealing plate 1 is installed in the post-cast hole 3. The bottom surface of the precast sealing plate 1 is flush with the bottom surface of the floor slab 6, and the top surface of the precast sealing plate 1 is lower than the top surface of the floor slab 6. A grid groove 5 is provided on the top of the floor slab 6, and the upper reinforcing bars 61 of the floor slab 6 are installed in the grid groove 5. The precast sealing plate 1 is welded and fixed to the upper reinforcing bars 61 by U-shaped reinforcing bars 2. The precast sealing plate 1 serves as the bottom formwork for the filling layer 4. The filling layer 4 is poured in the post-cast hole 3 and the grid groove 5 and connected to the floor slab 6.
[0032] like Figure 1 As shown, water-stop sealant 14 is installed at the top joint of the filling layer 4 and the floor slab 6, that is, at the joint of the grid groove 5 and the filling layer 4, and at the joint of the post-pouring hole 3 and the precast sealing plate 1. The water-stop sealant 14 is a water-swellable sealant. The filling layer 4 includes shrinkage-compensating concrete 41 and waterproof mortar 42. When the shrinkage-compensating concrete 41 is poured, the water in it will cause the water-stop sealant 14 to expand, thereby forming a barrier at the top joint of the filling layer 4 and the floor slab 6, and at the joint of the post-pouring hole 3 and the precast sealing plate 1, preventing moisture in the air from penetrating into the joint and corroding the U-shaped steel bars 2.
[0033] Specifically, such as Figure 2 , Figure 3 As shown, the precast sealing plate 1 is a precast hollow concrete slab with a cavity 11 in its center. The purpose of the cavity 11 is to reduce the self-weight of the precast sealing plate 1, thereby reducing the load on the U-shaped steel bars 2. Multiple U-shaped steel bars 2 are arranged alternately in a horizontal and vertical manner at the bottom of the precast sealing plate 1 and are precast together with the precast sealing plate 1. In this embodiment, four U-shaped steel bars 2 are arranged inside the precast sealing plate 1, two of which are arranged horizontally and the other two are arranged vertically.
[0034] It should be noted that the precast sealing plate 1 is placed inside the post-pouring hole 3, which can serve as the bottom formwork for the filling layer 4. At the same time, the U-shaped steel bars 2 connecting the floor slab 6 are poured together in the precast sealing plate 1, so that the precast sealing plate 1 can form a protective barrier for the U-shaped steel bars 2 from the bottom of the post-pouring hole 3.
[0035] like Figure 1As shown, multiple U-shaped steel bars 2 of the precast sealing plate 1 are installed inside the post-cast hole 3. The length of the U-shaped steel bars 2 is greater than the height of the post-cast hole 3. After extending out of the post-cast hole 3, the U-shaped steel bars 2 are bent and anchored to form a bent anchor part. The bent anchor part of the U-shaped steel bars 2 is welded and fixed to the upper steel bar 61 of the floor slab 6. The precast sealing plate 1 is suspended in the post-cast hole 3 by the U-shaped steel bars 2, so that it can form a suspended formwork.
[0036] It should be noted that the length of the bent anchor section must meet the requirements of the standard drawing 16G101-1. After pouring the filling layer 4 into the post-cast hole 3, the U-shaped steel bar 2 can provide sufficient support for the self-weight load of the precast sealing plate 1 and the filling layer 4.
[0037] like Figure 3 As shown, at the top of the floor slab 6, the grid groove 5 is centered on the center of the post-cast hole 3; the grid groove 5 includes two horizontal grooves and two vertical grooves, both of which are interrupted by the post-cast hole 3. Figure 1 As shown, the horizontal or vertical grooves of the grid groove 5 are provided with bevels 51 at the ends away from the post-cast hole 3. The bevels 51 start from the top surface of the floor slab and extend into the horizontal or vertical grooves; the length of the bevels 51 is equal to the bending anchorage length of the U-shaped steel bar 2.
[0038] It should be noted that the purpose of setting the bevel 51 in the grid groove 5 is to increase the connection area between the filling layer 4 and the floor slab 6, so as to make the connection between the filling layer 4 and the floor slab 6 more stable.
[0039] like Figure 3 As shown, the upper reinforcing bar 61 of the floor slab 6 is exposed in the groove 5 away from the bevel 51. The length of the upper reinforcing bar 61 exposed in the floor slab 6 is greater than the bending anchor length of the U-shaped reinforcing bar 2, so as to ensure that the bending anchor part of the U-shaped reinforcing bar 2 is completely welded to the upper reinforcing bar 61 exposed in the floor slab 6.
[0040] It is understandable that the bent anchor parts of the four U-shaped steel bars 2 of the prefabricated sealing plate 1 are welded and fixed to the upper steel bars 61 in the grid groove 5.
[0041] like Figure 1 As shown, the filling layer 4 includes shrinkage-compensating concrete 41 (concrete mixed with an appropriate amount of expanding agent or prepared with expanding cement). After the shrinkage-compensating concrete 41 is poured and filled into the post-pouring hole 3 and the grid groove 5, the shrinkage-compensating concrete 41 can fill the post-pouring hole 3. The top surface of the shrinkage-compensating concrete 41 is lower than the top surface of the floor slab 6 by a certain distance for applying waterproof coating. Then, waterproof mortar 42 is applied on top of the waterproof coating, and the top surface of the waterproof mortar 42 is flush with the top surface of the floor slab 6. The waterproof mortar and the waterproof coating work together to waterproof the shrinkage-compensating concrete 41, and the waterproof mortar also protects the waterproof coating. In this embodiment, the top surface of the shrinkage-compensating concrete 41 is one centimeter lower than the top surface of the floor slab 6.
[0042] like Figure 1 , Figure 3 As shown, in order to strengthen the connection between the filling layer 4 and the floor slab 6 and reduce the bearing pressure of the U-shaped steel bar 2, four reinforcing steel bars 62 are placed in the grid groove 5, parallel to the upper steel bar 61. The four reinforcing steel bars 62 are placed in the two horizontal grooves and two vertical grooves of the grid groove 5 respectively.
[0043] It should be noted that the length of the reinforcing steel bar 62 should meet the length requirements for straight anchors in the standard drawing 16G101-1.
[0044] like Figure 1 As shown, at the joint between the top of the filling layer 4 and the floor slab 6, that is, at the bottom and top of the bevel 51 of the grid groove 5, two layers of water-stopping adhesive 14 are applied. The water-stopping adhesive 14 is a water-swellable water-stopping adhesive. When the compensating shrinkage concrete 41 is poured, the water-stopping adhesive 14 expands under the action of the moisture in the compensating shrinkage concrete 41, forming two barriers at the joint to prevent air or moisture from flowing down the joint and to prevent corrosion of the reinforcing steel bars 62 and U-shaped steel bars 2.
[0045] like Figure 1 As shown, before placing the precast sealing plate 1 into the post-pouring hole 3, the top surface of the precast sealing plate 1 needs to be roughened and cleaned to increase the contact area with the filling layer 4.
[0046] like Figure 2 As shown, a horizontal groove 13 is provided on the top of the precast sealing plate 1, and multiple circumferential grooves 12 are provided on the circumferential sidewall. The horizontal groove 13 is located on the outside of the U-shaped steel bar 2. Water-stopping adhesive 14 is embedded in both the horizontal groove 13 and the circumferential groove 12. The water-stopping adhesive 14 is also water-swellable.
[0047] During the pouring of the filling layer 4, water in the shrinkage-compensating concrete 41 flows downwards under gravity, passing through the horizontal groove 13 and the circumferential groove 12, causing the water-stopping adhesive 14 within to expand and form multiple barriers. Subsequently, when moisture in the air seeps inwards through the gap between the precast sealing plate 1 and the post-pouring hole 3, it is blocked by the multiple barriers within the circumferential groove 12 and the horizontal groove 13, preventing further penetration and corrosion of the U-shaped steel reinforcement 2. The barrier formed by the water-stopping adhesive 14 within the horizontal groove 13 serves as a reinforcing barrier.
[0048] like Figure 1 As shown, in some embodiments, in order to strengthen the connection between the precast sealing plate 1 and the post-cast hole 3, structural adhesive 15 can be applied to the side of the precast sealing plate 1 (excluding the circumferential groove 12) as a safety redundancy.
[0049] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.
Claims
1. A system for sealing post-cast holes, comprising a floor slab with pre-drilled post-cast holes, characterized in that, A precast sealing plate is installed in the post-cast hole. The bottom surface of the precast sealing plate is flush with the bottom surface of the floor slab. A grid groove is installed on the top of the floor slab, and the upper reinforcement is installed in the grid groove. Multiple U-shaped steel bars are arranged in a horizontal and vertical alternating manner at the bottom of the precast sealing plate and are precast together with the precast sealing plate; the precast sealing plate is fixed to the upper steel bars by welding the U-shaped steel bars; A filling layer is poured into the post-pouring hole and the grid groove to connect with the floor slab; water-stop sealant is applied at the joint between the top of the filling layer and the floor slab, as well as at the joint between the post-pouring hole and the precast sealing plate.
2. The post-casting hole sealing system as described in claim 1, characterized in that, The precast sealing plate is a precast hollow concrete slab with a cavity in the center.
3. The post-casting hole sealing system as described in claim 1, characterized in that, The top surface of the precast sealing plate is lower than the top surface of the floor slab; the length of the U-shaped steel bar is greater than the height of the post-cast hole, and the U-shaped steel bar is bent and anchored after extending out of the post-cast hole to form a bent anchor part, which is welded and fixed to the upper steel bar.
4. The post-casting hole sealing system as described in claim 1, characterized in that, The grid-shaped groove is centered on the center of the post-cast hole and includes two horizontal grooves and two vertical grooves, both of which are interrupted by the post-cast hole.
5. The post-casting hole sealing system as described in claim 4, characterized in that, The transverse or longitudinal grooves are all provided with bevels at the ends away from the post-cast holes, and the length of the bevel is equal to the bending anchorage length of the U-shaped steel bar.
6. The post-casting hole sealing system as described in claim 5, characterized in that, The upper reinforcing bar is exposed in the groove of the horizontal or vertical groove away from the bevel, and its length is greater than the bending anchor length of the U-shaped reinforcing bar, so that the bending anchor part is completely welded to the upper reinforcing bar.
7. The post-casting hole sealing system as described in claim 5, characterized in that, Reinforcing bars are placed parallel to the upper reinforcing bars in the transverse or longitudinal groove.
8. The post-casting hole sealing system as described in claim 1, characterized in that, The filling layer includes shrinkage-compensating concrete, which is poured and filled in the post-cast holes and the grid grooves. The top surface of the shrinkage-compensating concrete is lower than the top surface of the floor slab by a set distance.
9. The post-casting hole sealing system as described in claim 8, characterized in that, The top surface of the shrinkage-compensating concrete is coated with waterproof paint, and waterproof mortar is applied on top of the waterproof paint, with the top surface of the waterproof mortar flush with the top surface of the floor slab.
10. The post-casting hole sealing system as described in claim 1, characterized in that, A horizontal groove is set on the top of the precast sealing plate, and multiple circumferential grooves are set on the circumferential sidewalls. The horizontal groove is set on the outside of the U-shaped steel bar. Water-stopping adhesive is embedded in both the horizontal groove and the circumferential groove.