Foam concrete backfill foundation pit side wall structure
By setting up a foam concrete backfill structure on the side wall of the foundation pit, combined with components such as brick tire molds and casting nets, the post-work settlement problem of blind spots in traditional backfill materials during the rolling process is solved, and the stability and uniformity of the side wall of the foundation pit is improved.
Patent Information
- Application Number
- CN202422500756.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-10-15
AI Technical Summary
Traditional foundation pit backfill materials are prone to blind spots during the rolling process, resulting in post-work settlement problems, affecting the stability of the side wall of the foundation pit and the safety of surrounding buildings.
The side wall structure of the foundation pit is backfilled with foam concrete, including the first fence and the second fence, and the fence is filled with foam concrete, combined with components such as brick tire molds, cast nets and baffles to form a stable backfilling area.
Through the lightweight properties and good filling performance of foam concrete, the load on the sidewall of the foundation pit is reduced, the uniformity of the backfill area is ensured, blind spot settlement is avoided, the stability and shear resistance of the structure are improved, and the risk of deformation or collapse is reduced.
Smart Images
Figure CN223202346U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of building construction, and in particular to a foam concrete backfill foundation pit side wall structure. Background Art
[0002] With the acceleration of urbanization and the increasing number of infrastructure projects, foundation pit construction, as a crucial component of urban infrastructure development, is directly impacted by the quality of its construction. During the excavation process, the stability of the sidewalls and the compaction quality of the backfill area are key issues. Traditional foundation pit backfill often uses earth and stone materials, which are prone to blind spots during rolling, leading to post-construction settlement problems and compromising the stability and service life of the pit sidewalls.
[0003] Post-construction settlement refers to the gradual sinking of the ground due to soil consolidation after the foundation pit is backfilled. Post-construction settlement not only affects the stability of the foundation pit, but can also lead to uneven settlement of surrounding buildings and even cause safety accidents. Utility Model Content
[0004] In order to improve the problem of post-construction settlement in the blind area of soil compaction in the backfill area, the present application provides a foam concrete backfill foundation pit side wall structure.
[0005] The foam concrete backfill foundation pit sidewall structure provided in this application adopts the following technical solution:
[0006] A foam concrete backfill foundation pit side wall structure, comprising:
[0007] The first enclosure is fixedly arranged on the wall of the foundation pit;
[0008] A second enclosure is fixedly arranged on a side of the first enclosure away from the foundation pit wall and is arranged opposite to the first enclosure;
[0009] The backfill portion is arranged between the first enclosure and the second enclosure and is filled with foam concrete.
[0010] By adopting the above technical solution, the first enclosure and the second enclosure play the role of supporting and defining the backfill area. The lightweight characteristics of foam concrete help to reduce the load on the side walls of the foundation pit. At the same time, its good filling performance can ensure the uniformity of the backfill area, avoiding the blind spots that are easily generated by traditional backfill materials during the rolling process, thereby improving the problem of post-construction settlement in the blind spots of the backfill area.
[0011] Preferably, the first enclosure is a brick formwork.
[0012] By adopting the above technical solution, the brick formwork serves as the first enclosure, which not only plays the role of template, but also has the function of supporting and protecting the side walls of the foundation pit.
[0013] Preferably, the first enclosure is built using the one-by-one principle.
[0014] By adopting the above technical solution, the staggered masonry pattern of the first enclosure increases the shear resistance of the first enclosure and reduces the risk of deformation or collapse of the first enclosure due to lateral pressure.
[0015] Preferably, a fence support is provided on a side of the second fence away from the first fence, and the fence support is detachably connected to the second fence.
[0016] By adopting the above technical solution, the enclosure support can enhance the stability and bearing capacity of the second enclosure, ensuring the stability of the second enclosure during foundation pit backfilling and use.
[0017] Preferably, it further includes a bottom plate, which is arranged at the bottom of the first enclosure, the backfill portion and the second enclosure, and the bottom plate is fixedly connected to the bottom of the first enclosure and the second enclosure.
[0018] By adopting the above technical solution, the bottom plate serves as the base of the entire structure and can provide a larger bottom area, thereby increasing the stability of the side wall structure of the foam concrete backfill pit and reducing the risk of structural instability due to uneven foundation settlement.
[0019] Preferably, the first enclosure and the second enclosure are both covered with a casting mesh.
[0020] By adopting the above technical solution, the casting mesh can be combined with the foam concrete to form a whole, thereby strengthening the connection between the first enclosure, the second enclosure and the backfill material, thereby improving the stability of the entire foam concrete backfill foundation pit side wall structure.
[0021] Preferably, it further includes a baffle, which is vertically arranged on the backfill portion, and the two sides of the baffle are detachably connected to the first enclosure and the second enclosure respectively, and the bottom of the baffle is detachably connected to the top of the base plate.
[0022] By adopting the above technical solution, the baffle can provide additional support and increase the overall stability of the backfill part.
[0023] Preferably, a plurality of baffles are provided, and the baffles are distributed at equal intervals in the backfill portion.
[0024] By adopting the above technical solution, a number of baffles divide the backfill part into multiple small areas, which helps to control the pouring process of the foam concrete and ensure the uniformity and density of each part.
[0025] Preferably, a casting mesh is fixedly provided on each of the baffles.
[0026] By adopting the above technical solution, the casting mesh can be combined with the foam concrete to form a more solid overall structure; the casting mesh helps to reduce the formation of cracks in the foam concrete during the solidification and drying process.
[0027] In summary, this application includes at least one of the following beneficial technical effects:
[0028] 1. The first and second enclosures support and define the backfill area. The lightweight nature of foam concrete helps reduce the load on the sidewalls of the foundation pit. At the same time, its good filling performance ensures the uniformity of the backfill area, avoiding the blind spots that are easily generated during the rolling process of traditional backfill materials, thereby improving the problem of post-construction settlement in the blind areas of the backfill area.
[0029] 2. The brick formwork serves as the first enclosure, not only serving as a template, but also supporting and protecting the side walls of the foundation pit;
[0030] 3. The staggered masonry pattern of the first enclosure increases the shear resistance of the first enclosure and reduces the risk of deformation or collapse of the first enclosure due to lateral pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 This is one of the structural schematic diagrams of the side wall structure of the foam concrete backfill foundation pit in another embodiment of the present application;
[0032] Figure 2 Schematic diagram of the structure of the side wall of the foundation pit backfilled with foam concrete in an embodiment of the present application;
[0033] Figure 3 This is a second structural diagram of a foam concrete backfill foundation pit sidewall structure in another embodiment of the present application;
[0034] Figure 4 It is a structural schematic diagram of the foam concrete backfill foundation pit side wall structure in another embodiment of the present application.
[0035] Explanation of the accompanying reference numerals: 1. First enclosure; 2. Second enclosure; 3. Backfill; 4. Bottom plate; 5. Cap; 6. Baffle; 7. Casting mesh; 8. Half-length steel cage; 9. Enclosure support. DETAILED DESCRIPTION
[0036] The following is combined with Figure 1-4 This application is described in further detail.
[0037] The embodiment of the present application discloses a foam concrete backfill foundation pit side wall structure, which is arranged in the foundation pit. Figure 1 and Figure 2 The side wall structure of the foam concrete backfill foundation pit includes a first enclosure 1, a second enclosure 2, a backfill part 3 and a bottom plate 4.
[0038] like Figure 1 As shown, the first enclosure 1 is set in the foundation pit, and the first enclosure 1 is fixedly set on the wall of the foundation pit. The first enclosure 1 is specifically a brick formwork, and the first enclosure 1 is built using the one-by-one principle; the brick formwork serves as the first enclosure 1, not only plays the role of a template, but also bears the function of supporting and protecting the side walls of the foundation pit. The staggered masonry pattern of the first enclosure 1 increases the shear resistance of the first enclosure 1 and reduces the risk of deformation or collapse of the first enclosure 1 due to lateral pressure.
[0039] like Figure 1 As shown, the second enclosure 2 is fixedly arranged on the side of the first enclosure 1 away from the foundation pit wall, and is arranged opposite to the first enclosure 1. The side of the second enclosure 2 away from the first enclosure 1 is provided with an enclosure support 9, and the enclosure support 9 is detachably connected to the second enclosure 2; in this embodiment of the application, the second enclosure 2 can be a brick formwork and / or steel sheet pile and other structures, and the second enclosure 2 can form a stable working area with the first enclosure 1 to facilitate pouring operations; the enclosure support 9 is specifically a steel pipe support frame, and the enclosure support 9 can enhance the stability and bearing capacity of the second enclosure 2, and ensure the stability of the second enclosure 2 during foundation pit backfilling and use.
[0040] The first enclosure 1 and the second enclosure 2 play the role of supporting and defining the backfill area. At the same time, the gap between the first enclosure 1 and the second enclosure 2 for pouring foam concrete is the backfill part 3. The lightweight characteristics of foam concrete help to reduce the load on the side walls of the foundation pit. At the same time, its good filling performance can ensure the uniformity of the backfill area, avoiding the blind spots that are easily generated by traditional backfill materials during the rolling process, thereby improving the problem of post-construction settlement of the backfill area's fill rolling blind spots.
[0041] In an embodiment of the present application, the first enclosure 1 and the second enclosure 2 are both covered with a casting mesh 7, which is specifically a wire mesh. The first enclosure 1 and the second enclosure 2 are fixedly connected to the corresponding casting mesh 7 by welding and / or bolting. The casting mesh 7 can be combined with the foam concrete to form a whole, thereby enhancing the connection between the first enclosure 1, the second enclosure 2 and the backfill material, thereby improving the stability of the entire foam concrete backfill foundation pit side wall structure.
[0042] like Figure 1 As shown, the bottom plate 4 is arranged below the first enclosure 1, the backfill part 3 and the second enclosure 2, and the top of the bottom plate 4 is fixedly connected to the bottom of the first enclosure 1 and the bottom of the second enclosure 2 respectively. The bottom plate 4 serves as the base of the entire structure and can provide a larger bottom area, thereby increasing the stability of the side wall structure of the foam concrete backfill foundation pit and reducing the risk of structural instability due to uneven foundation settlement.
[0043] The baffle 6 is vertically arranged on the backfill part 3, and the two sides of the baffle 6 are detachably connected to the first enclosure 1 and the second enclosure 2 respectively, and the bottom of the baffle 6 is detachably connected to the top of the bottom plate 4. There are several baffles 6, and several baffles 6 are equidistantly distributed on the backfill part 3. Several baffles 6 are detachably provided with casting nets 7; the baffle 6 can provide additional support to increase the overall stability of the backfill part 3, and several baffles 6 divide the backfill part 3 into multiple small areas, which helps to control the pouring process of the foam concrete and ensure the uniformity and density of each part. The casting net 7 on the baffle 6 can be combined with the foam concrete to form a more solid overall structure; the casting net 7 helps to reduce the formation of cracks in the foam concrete during the solidification and drying process.
[0044] Optionally, in an embodiment of the present application, a pedestal 5 is fixedly provided below the base plate 4, and the top of the pedestal 5 is fixedly connected to the bottom of the base plate 4 to disperse and transfer the load, reduce stress concentration, and further enhance the stability of the side wall structure of the foam concrete backfill foundation pit.
[0045] It should be noted that foamed concrete is a lightweight, porous material created by mechanically pressurizing a foamed aqueous solution into a uniform, closed foam of bubbles. This foam is then injected into a slurry made of cement, admixtures, water, and various additives. The mixture is then mixed, poured, and cured to create the finished product. Foamed concrete is simple to prepare on-site, allows for easy backfilling, and is unaffected by the working surface, making it suitable for foundation pit backfilling.
[0046] In the embodiment of the present application, the masonry joints of the first enclosure 1 should be horizontal and vertical, the thickness of the horizontal joints and the width of the vertical joints should be 8mm~12mm, the mortar of the horizontal joints should be full, and the mortar fullness of the horizontal joints should be 78%~82%. The vertical joints should be filled with mortar by squeezing, and no transparent joints, blind joints or false joints should appear. It is strictly forbidden to use water to flush the joints.
[0047] Foamed concrete can be prepared on site, and the preparation method can be set according to actual construction needs. This application does not impose specific restrictions on the preparation method of foamed concrete. For ease of understanding, the foamed concrete in the embodiment of this application can be prepared by methods including but not limited to the following: adding a foaming agent and 12 to 13 times the amount of water in the foaming bottle and inflating and pressurizing for 3 to 6 minutes, and stopping the air compressor after the air pressure is increased to 0.6 MPa to 0.8 MPa; adding water, cement, admixtures and additives in the mixer in this order and stirring for 2 to 3 minutes to form a thick concentrate, and then adding the foam formed as described above, and then transporting the mud and foaming agent to the backfill part 3 through the conduit.
[0048] In addition, since foam concrete has strong fluidity, in order to prevent it from flowing into the rest of the backfill area, the first enclosure 1, the second enclosure 2 and the casting net 7 on the bottom plate 4 in the embodiment of the present application are reserved with gaps to accommodate the baffle 6, so that the baffle 6 can be placed into the backfill part 3 before the foam concrete, and the foam concrete can be divided into multiple sections; the virtual thickness of the foam concrete is 1.2 to 1.3 times the actual thickness, and then it is scraped flat with a 3mm long aluminum alloy scraper.
[0049] In this embodiment of the application, the baffle 6 is retained in the backfill portion 3 to provide additional support, which helps to improve the overall stability of the foam concrete backfill foundation pit side wall structure.
[0050] Depending on the ambient temperature, within 3 to 12 hours after pouring foam concrete, cover with straw, reed mats, sacks, sawdust, wet soil, or wet sand to maintain the concrete. The foam concrete should be cured for at least 7 days. For concrete containing retarders or requiring impermeability, the curing time should be at least 14 days; when using bauxite cement, the curing time should be at least 3 days.
[0051] When the temperature is above 15°C, the foam concrete should be watered at least every three hours for three days and three nights after pouring, with watering twice in the evening. During subsequent curing, water should be watered at least three times a day (when the temperature is dry, the watering frequency can be increased appropriately). For large areas (or large volumes) of foam concrete, "water storage curing" should be adopted.
[0052] In another embodiment, Figure 3 As shown, the foam concrete backfill foundation pit side wall structure is only provided with the first enclosure 1, the second enclosure 2, the baffle 6, the backfill part 3 and the enclosure support 9, and other components such as the bottom plate 4, the base 5 and the casting net 7 are omitted, making the entire structure simpler and reducing the complexity and cost of construction; due to the fewer structural components, the project period can be shortened; in this application embodiment, as shown in FIG. Figure 1 and Figure 3 As shown, the baffle 6 is specifically a wooden board. The baffle 6 and the enclosure support 9 are removed after the foam concrete solidifies. The foam concrete is prepared and poured at the same time, and there is no need for traditional soil excavation, soil transportation and soil compaction construction steps. Compared with traditional backfill construction, there is no need for backfill compaction, the settlement after backfilling is small, and the project period can be effectively reduced.
[0053] In yet another embodiment, Figure 4 As shown, the backfill portion 3 of the foam concrete backfill foundation pit side wall structure is also provided with a half steel cage 8 cut in half along the diameter. The half steel cage 8 is laid in the backfill portion 3 according to actual construction needs to form an arch structure in the backfill portion 3, thereby improving the stability and durability of the foam concrete backfill foundation pit side wall structure.
[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A foam concrete backfill foundation pit side wall structure, characterized in that: include: A first enclosure (1) is fixedly arranged on the wall of the foundation pit; A second enclosure (2) is fixedly arranged on a side of the first enclosure (1) away from the foundation pit wall and is arranged opposite to the first enclosure (1); The backfill portion (3) is arranged between the first enclosure (1) and the second enclosure (2) and is filled with foam concrete.
2. The foam concrete backfill foundation pit sidewall structure according to claim 1, characterized in that: The first enclosure (1) is a brick formwork.
3. The foam concrete backfill foundation pit sidewall structure according to claim 2, characterized in that: The first enclosure (1) is built using the principle of one vertical and one horizontal.
4. The foam concrete backfill foundation pit sidewall structure according to claim 1, characterized in that: A fence support (9) is provided on a side of the second fence (2) away from the first fence (1), and the fence support (9) is detachably connected to the second fence (2).
5. The foam concrete backfill foundation pit side wall structure according to claim 1, characterized in that: It also includes a bottom plate (4), which is arranged at the bottom of the first enclosure (1), the backfill portion (3) and the second enclosure (2), and the bottom plate (4) is fixedly connected to the bottom of the first enclosure (1) and the second enclosure (2).
6. The foam concrete backfill foundation pit side wall structure according to claim 5, characterized in that: It also includes a supporting platform (5), which is fixedly arranged on the bottom of the base plate (4).
7. The foamed concrete backfill foundation pit sidewall structure according to claim 1, characterized in that: The first enclosure (1) and the second enclosure (2) are both covered with a casting mesh (7).
8. The foam concrete backfill foundation pit sidewall structure according to claim 5, characterized in that: It also includes a baffle (6), which is vertically arranged on the backfill portion (3), and the two sides of the baffle (6) are detachably connected to the first enclosure (1) and the second enclosure (2), respectively, and the bottom of the baffle (6) is detachably connected to the top of the base plate (4).
9. The foamed concrete backfill foundation pit sidewall structure according to claim 8, characterized in that: A plurality of baffles (6) are provided, and the baffles (6) are distributed at equal intervals in the backfill portion (3).
10. The foam concrete backfill foundation pit side wall structure according to claim 9, characterized in that: A casting net (7) is fixedly provided on each of the baffles (6).