Raft foundation expansion reinforcing band pouring structure
By introducing an expansion reinforcement belt structure into the raft foundation, the problem of long construction period was solved, the crack resistance was improved and the construction was simplified, thus reducing the project cost.
Patent Information
- Application Number
- CN202422860671.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-22
AI Technical Summary
In the existing technology, the construction period of large-area raft foundation is long, and it is necessary to set up post-cast strips and water-stop steel plates, which prolongs the construction period and complicates the construction.
An expansion reinforcement belt is added to the raft foundation, including reinforcement bars at the bottom and top of the expansion belt, a supporting steel bar frame and a barrier structure. High-strength concrete and isolation nets are used to achieve independent casting of the expansion reinforcement belt.
It improves the crack resistance of the raft foundation, simplifies the construction process, shortens the construction period, reduces the project cost, and meets the requirements of energy-saving and low-carbon buildings.
Smart Images
Figure CN223373748U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of raft foundation casting, in particular to a raft foundation expansion reinforcement belt casting structure. Background Art
[0002] Large-area raft foundation is a commonly used foundation form in construction projects. It has the advantages of strong bearing capacity and good seismic resistance. However, in actual projects, due to the unevenness of the foundation and the uneven distribution of loads, post-cast joints are generally set up during on-site construction. The post-cast joints require the installation of water-stop steel plates and the addition of formwork and other construction processes, which leads to a longer construction period.
[0003] According to conventional design requirements, the expansion concrete in the post-casting joint generally needs to be poured 60 days after the main structure is completed or the concrete is poured. This will extend the construction period by about 60 days or more. Utility Model Content
[0004] The purpose of the utility model is to solve the problems existing in the above-mentioned prior art and to provide a raft foundation expansion reinforcement belt casting structure.
[0005] The utility model is achieved through the following technical solutions:
[0006] A raft foundation expansion reinforcement strip casting structure comprises a raft slab bottom stress-bearing steel bar and a raft slab top stress-bearing steel bar, an expansion strip bottom reinforcement steel bar, an expansion strip top reinforcement steel bar, an expansion strip support steel bar frame and a barrier structure; the expansion strip bottom reinforcement steel bar is fixedly connected to the raft slab bottom stress-bearing steel bar, and the expansion strip top reinforcement steel bar is fixedly connected to the raft slab top stress-bearing steel bar; the expansion strip support steel bar frame is fixedly connected between the expansion strip bottom reinforcement steel bar and the expansion strip top reinforcement steel bar, and a plurality of expansion strip support steel bar frames are provided, and the plurality of expansion strip support steel bar frames are evenly distributed along the length direction of the expansion reinforcement strip; two barrier structures are provided, and the two barrier structures are arranged along the length direction of the expansion reinforcement strip, and the two barrier structures are connected and fixed on both sides of the plurality of expansion strip support steel bar frames as a whole.
[0007] Furthermore, the expansion band support steel bar frame includes two left and right expansion band vertical reinforcement steel bars, the upper and lower parts of the two expansion band vertical reinforcement steel bars are fixedly connected with expansion band tension steel bars, and the top ends of the two expansion band vertical reinforcement steel bars are fixedly connected with expansion band diagonal bracing steel bars.
[0008] Furthermore, the barrier structure adopts an isolation net.
[0009] Furthermore, temperature measuring holes and vibration holes are reserved on the reinforcing steel bars at the top of the expansion belt.
[0010] Furthermore, a manhole is reserved on the stress-bearing steel bars at the top of the raft slab.
[0011] Furthermore, a number of temperature measuring holes are provided, and the distance between adjacent temperature measuring holes is 10m.
[0012] Furthermore, a number of vibration holes are provided, and the spacing between adjacent vibration holes is 3500 mm.
[0013] This new structure, by adding an expansion reinforcement strip to the raft foundation, not only effectively improves the crack resistance of the raft foundation, reduces the number of waterstop steel plates and formwork required for construction, but also shortens the construction period. The expansion reinforcement strip is poured simultaneously with the large concrete surface, eliminating the need for cleaning the post-cast strip and also eliminating the reinforcement strip at the bottom of the post-cast strip of the foundation raft. This speeds up the turnover of formwork and steel pipe supports, thereby simplifying the construction process and reducing project costs, meeting the requirements of energy-saving and low-carbon buildings. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.
[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0016] Figure 2 This is a schematic diagram of the overall structure of the utility model after pouring concrete.
[0017] Figure 3 It is a partial plan view of the structure of the utility model.
[0018] Figure 4 for Figure 3 AA section view in.
[0019] Figure 5 for Figure 3 BB cross-section view in.
[0020] In the figure: 1- raft slab bottom stress-bearing steel bars, 2- raft slab top stress-bearing steel bars, 3- expansion zone bottom reinforcement steel bars, 4- expansion zone top reinforcement steel bars, 5- barrier structure, 6- temperature measuring hole, 7- vibrating hole, 8- manhole, 9- expansion zone vertical reinforcement steel bars, 10- expansion zone tension steel bars, 11- expansion zone diagonal bracing steel bars; 100- raft slab foundation section, 101- ordinary concrete layer, 200- expansion reinforcement zone section, 201- expansion concrete layer. DETAILED DESCRIPTION
[0021] In order to make those skilled in the art better understand the present invention, the present invention is further clearly and completely described below with reference to the accompanying drawings and embodiments. It should be noted that, unless there is a conflict, the features in the embodiments and examples of this application can be combined with each other.
[0022] In the description of the present invention, it should be understood that the terms "top", "bottom", "left", "right", "up", "down", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0023] like Figures 1 to 5 As shown, this embodiment provides a raft foundation expansion reinforcement strip casting structure, which is divided into a raft foundation section 100 and an expansion reinforcement strip section 200; the raft foundation section 100 includes the raft bottom stress-bearing steel bars 1 and the raft top stress-bearing steel bars 2, and the expansion reinforcement strip section 200 includes the expansion strip bottom reinforcement steel bars 3, the expansion strip top reinforcement steel bars 4, the expansion strip support steel bar frame and the barrier structure 5.
[0024] The bottom reinforcement steel bar 3 of the expansion band is fixedly connected to the bottom stress-bearing steel bar 1 of the raft slab, and the top reinforcement steel bar 4 of the expansion band is fixedly connected to the top stress-bearing steel bar 2 of the raft slab; the part of the top reinforcement steel bar 4 of the expansion band located in the expansion reinforcement band section 200 is reserved with temperature measuring holes 6 and vibration holes 7, and there are several temperature measuring holes 6 and vibration holes 7, and the spacing between adjacent temperature measuring holes 6 is 10m, and the spacing between adjacent vibration holes 7 is 3500mm; the part of the top stress-bearing steel bar 2 of the raft slab located in the raft slab foundation section 100 is reserved with a manhole 8.
[0025] The expansion band support steel bar frame is fixedly connected between the bottom reinforcement steel bar 3 of the expansion band and the top reinforcement steel bar 4 of the expansion band. There are several expansion band support steel bar frames, and the several expansion band support steel bar frames are evenly distributed along the length direction of the expansion reinforcement band section 200; the expansion band support steel bar frame includes two left and right expansion band vertical reinforcement steel bars 9, and the expansion band tension steel bars 10 are fixedly connected between the upper and lower parts of the two expansion band vertical reinforcement steel bars 9, and the top ends of the two expansion band vertical reinforcement steel bars 9 are fixedly connected with the expansion band diagonal bracing steel bars 11.
[0026] The barrier structure 5 adopts an isolation net, preferably a double-layer isolation net. There are two isolation nets, which are arranged along the length of the expansion reinforcement band section 200. The two isolation nets are connected and fixed on both sides of the entire expansion band support steel frame, that is, the isolation net is fixedly connected to the corresponding side expansion band vertical reinforcement steel bar 9.
[0027] In the structure described in this embodiment, the raft foundation section 100 is partially cast to form an ordinary concrete layer 101, and the expansion reinforcement belt section 200 is partially cast to form an expansive concrete layer 201. The shrinkage resistance of the concrete in the expansive concrete layer 201 is greater than that of the concrete in the ordinary concrete layer 101.
[0028] The structure described in this embodiment is to add an expansion reinforcement strip section 200 to a large-area raft foundation section 100. The reinforcement structure expansion strip support steel frame (expansion strip vertical reinforcement steel bars 9, expansion strip tension steel bars 10, expansion strip diagonal bracing steel bars 11) and the barrier structure 5 (double-layer isolation net) are provided therein, so that the expansion reinforcement strip has an independent casting section. The expansion strip diagonal bracing steel bars 11 added to the expansion strip vertical reinforcement steel bars 9 can better fix the barrier structure 5. The fixing structure of the barrier structure 5 and the expansion strip bottom reinforcement steel bars 3, expansion strip top reinforcement steel bars 4, expansion strip vertical reinforcement steel bars 9, expansion strip tension steel bars 10, and expansion strip diagonal bracing steel bars 11 is reliable and stable. The barrier structure 5 uses a double-layer isolation net, which has the characteristics of micro-deformation, can better utilize the shrinkage of the expansion reinforcement strip, and has better connectivity with the large-area raft foundation concrete, thereby better controlling the occurrence of cracks in the raft foundation.
[0029] The construction method of the structure described in this embodiment includes the following steps:
[0030] 1. Rebar binding:
[0031] 1.1. Binding of the raft slab bottom stress reinforcement 1: Bind the raft slab bottom stress reinforcement 1 with a single layer of bidirectional stress reinforcement and the specification is C28@150. The stress reinforcement is not allowed to be cut off. The bottom reinforcement steel bar 3 of the expansion zone is set between every two raft slab bottom stress reinforcement 1 and the specification is C16. After the raft slab bottom stress reinforcement 1 is tied, stirrups are added with a spacing of C20@1000*1000mm. Because the thickness of the raft slab foundation is 1300mm, it is necessary to support the raft slab top stress reinforcement 2.
[0032] 1.2. Binding of the stress-bearing steel bars 2 on the top of the raft slab: The stress-bearing steel bars 2 on the top of the raft slab shall be single-layer bidirectional stress-bearing steel bars with a specification of C28@150. The stress-bearing steel bars are not allowed to be cut off. The top reinforcement steel bars 4 of the expansion zone shall be arranged between every two stress-bearing steel bars 2 on the top of the raft slab and the specification shall be C16. Since the spacing between the top reinforcement steel bars 2 of the raft slab and the top reinforcement steel bars 4 of the expansion zone is 75mm, a manhole 8 with a size of 1000mm*1000mm and vibration holes 7 with a spacing of 3500mm shall be reserved.
[0033] 1.3. Expansion zone vertical reinforcement steel bars 9: Due to the laying of the isolation net, it is necessary to add C20@800mm expansion zone vertical reinforcement steel bars 9 and C20@800mm expansion zone diagonal bracing steel bars 11.
[0034] 1.4. Laying the isolation net: Use the expansion belts on both sides to vertically reinforce the steel bars 9 to clamp the isolation net and lay a double layer of isolation net to ensure that the concrete gravel passes through the isolation belt.
[0035] 1.5. Expansion band tension steel bars 10: As the thickness of the raft foundation is 1300mm, two C20 expansion band tension steel bars 10 are added with a horizontal spacing of 1000mm and a vertical spacing of 1600mm.
[0036] 2.1.6 Temperature measuring hole 6: Since the concrete grades of the expansion reinforcement zone section 200 and the raft foundation section 100 are inconsistent, temperature measuring holes 6 need to be reserved with a spacing of 10m.
[0037] 2. Concrete pouring:
[0038] 2.1. Pouring concrete for the raft foundation section 100: The raft foundation section 100 has a large concrete volume. To ensure the construction quality of concrete pouring, continuous layered pouring is adopted. Since the raft foundation thickness is 1300mm, the concrete is poured in layers (500mm / 500mm / 300mm). When the concrete is poured near the expansion reinforcement belt section 200, it is necessary to pour the concrete on both sides of the expansion reinforcement belt section 200 first, and then pour the concrete of the expansion reinforcement belt section 200. The concrete grade C40 of the expansion reinforcement belt section 200 is higher than the concrete grade C35 of the raft foundation section 100. During construction, care should be taken to avoid pouring the concrete of the raft foundation section 100 into the expansion reinforcement belt section 200. In this way, continuous pouring is carried out without leaving expansion joints or post-casting strips, and the construction is completed in one go.
[0039] 2.2 Concrete Curing: For the concrete in the expansion reinforcement band section 200 with expansive agent, timely curing is crucial for eliminating shrinkage cracks. Within 12 hours after pouring, immediately cover the concrete with a layer of burlap or felt and perform wet curing. Curing should last for at least 28 days, ensuring at least two watering sessions per day. This method not only ensures timely curing of the concrete, maintaining surface moisture, but also prevents erosion and damage to the initial setting concrete surface caused by watering.
[0040] 2.3 Temperature Monitoring: The raft foundation is 1300mm thick. During construction, the temperature difference between the inside and outside of the raft foundation must be monitored. A dedicated person will use a concrete thermometer to perform intermittent monitoring 24 hours a day, recording, analyzing, and reporting alarms. Temperatures at different locations are monitored and controlled to maintain a temperature difference within 25°C, with a temperature drop of no more than 10°C per day. Detailed records of concrete temperature changes are maintained, and a temperature curve is plotted to reflect the actual temperature fluctuations.
[0041] The above-described embodiments merely represent the best modes of implementation of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.
Claims
1. A raft foundation expansion reinforcement strip casting structure, comprising a raft bottom stress-bearing steel bar and a raft top stress-bearing steel bar, characterized in that: It also includes the bottom reinforcement steel bars of the expansion band, the top reinforcement steel bars of the expansion band, the support steel bar frame of the expansion band and the barrier structure; the bottom reinforcement steel bars of the expansion band are fixedly connected to the stress-bearing steel bars at the bottom of the raft slab, and the top reinforcement steel bars of the expansion band are fixedly connected to the stress-bearing steel bars at the top of the raft slab; the support steel bar frame of the expansion band is fixedly connected between the bottom reinforcement steel bars of the expansion band and the top reinforcement steel bars of the expansion band, and there are several support steel bar frames of the expansion band, and the several support steel bar frames of the expansion band are evenly distributed along the length direction of the expansion reinforcement band; there are two barrier structures, and the two barrier structures are arranged along the length direction of the expansion reinforcement band, and the two barrier structures are connected and fixed on both sides of the several support steel bar frames of the expansion band as a whole.
2. The raft foundation expansion reinforcement strip casting structure according to claim 1, characterized in that: The expansion band support steel bar frame includes two left and right expansion band vertical reinforcement steel bars, the upper and lower parts of the two expansion band vertical reinforcement steel bars are fixedly connected with expansion band tension steel bars, and the top ends of the two expansion band vertical reinforcement steel bars are fixedly connected with expansion band diagonal bracing steel bars.
3. The raft foundation expansion reinforcement strip casting structure according to claim 1, characterized in that: The barrier structure adopts isolation net.
4. The raft foundation expansion reinforcement strip casting structure according to claim 1, characterized in that: Temperature measuring holes and vibration holes are reserved on the reinforcing steel bars at the top of the expansion belt.
5. The raft foundation expansion reinforcement strip casting structure according to claim 1, characterized in that: A manhole is reserved on the stress-bearing steel bars at the top of the raft slab.
6. The raft foundation expansion reinforcement strip casting structure according to claim 4, characterized in that: There are several temperature measuring holes, and the distance between adjacent temperature measuring holes is 10m.
7. The raft foundation expansion reinforcement strip casting structure according to claim 4, characterized in that: There are several vibration holes, and the distance between adjacent vibration holes is 3500mm.