An independent column foundation structure, independent column components, and building for encountering original well pits.
Patent Information
- Application Number
- CN202522230346.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-09-01
- Estimated Expiration
- 2035-10-22
AI Technical Summary
这种传统处理方式有以下不足；1、为了减小旧井对两个独立柱基的影响，需要将独立柱基尽量远离原始井坑，这样会造成转换梁跨度及配筋增大（不经济）；2、由于转换梁有一定长度和高度，需要增加转换梁的土方开挖量；3、由于对原始井坑深度、填充等实际情况不容易了解清楚，即使独立柱基远离原始井坑，也不能完全避免基础应力扩散时对原始井坑侧壁的不利影响，进一步导致建筑物基础存在安全隐患
[0005]上述技术方案的有益效果在于：如此可在基坑下方出现原始井坑时，可对原始井坑内进行部分掏空以保留部分原始填充层，然后依次填入石料层和混凝土填充层，这样可对原始井坑进行填充加固，相当于对独立柱基本体的基础进行加固，而混凝土垫层和独立柱基均扩大，并确保能将原始井坑完全覆盖，这样使得原始井坑位于独立柱基本体的正下方，此时独立柱基本体相当于骑跨过原始井坑，可避免原始井坑井壁因受力不均而塌陷，从而影响独立柱基本体的可靠性，而独立柱基本体扩大则相当于提高安全余量，以对其下方原始井坑这一基础薄弱处进行强度补偿。
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Figure CN224705171U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of building technology, and in particular relates to an independent column foundation structure, independent column components and building for encountering original well pits. Background Technology
[0002] When a building uses independent column foundations, it is sometimes necessary to encounter situations where old water wells (referred to as "original well pits") from several years ago exist on the original site, and these pits have already been filled with the original infill layer. Since the building design is already finalized, the existence of the original well pits is a localized issue, and modifying the position of the vertical components is impractical. In such cases, localized treatment measures for the original well pits need to be considered. Because original well pits are generally deep and their depth is uncertain, a full excavation followed by soil replacement is not suitable. The traditional treatment method is generally a "lifting" approach, which involves using two independent column foundations plus transfer beams to support the vertical components, thus allowing the foundation design to span the original well pit. This traditional approach has the following drawbacks: 1. To reduce the impact of the old well on the two independent column foundations, the independent column foundations need to be moved as far away from the original well pit as possible, which will increase the span and reinforcement of the transfer beam (uneconomical); 2. Since the transfer beam has a certain length and height, the earthwork excavation volume for the transfer beam needs to be increased; 3. Since it is not easy to understand the actual situation such as the depth and filling of the original well pit, even if the independent column foundations are far away from the original well pit, the adverse effects on the sidewalls of the original well pit when the foundation stress diffuses cannot be completely avoided, which further leads to safety hazards in the building foundation. Utility Model Content
[0003] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide an independent column foundation structure for original well pits that is simple in structure, low in construction cost, and has good reliability.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows: An independent column foundation structure for an original well pit includes a foundation pit, a concrete cushion layer, and an independent column foundation. The concrete cushion layer is disposed on the bottom wall of the foundation pit, and the independent column foundation is disposed in the middle of the upper end of the concrete cushion layer. The independent column foundation is a cast-in-place reinforced concrete component. Below the foundation pit, there is also an original well pit, and the wellhead of the original well pit penetrates through the bottom wall of the foundation pit. The original well pit is filled from bottom to top with an original filling layer, a stone layer, and a concrete filling layer. Both the concrete cushion layer and the independent column foundation extend outward and cover the original well pit.
[0005] The beneficial effects of the above technical solution are as follows: When an original well pit appears below the foundation pit, the original well pit can be partially hollowed out to retain part of the original filling layer. Then, a stone layer and a concrete filling layer are filled in sequence. This can fill and reinforce the original well pit, which is equivalent to reinforcing the foundation of the independent column. The concrete cushion layer and the independent column foundation are both enlarged to ensure that the original well pit is completely covered. This makes the original well pit located directly below the independent column foundation. At this time, the independent column foundation is equivalent to straddling the original well pit, which can prevent the well wall of the original well pit from collapsing due to uneven stress, thereby affecting the reliability of the independent column foundation. The enlargement of the independent column foundation is equivalent to increasing the safety margin to compensate for the strength of the weak point of the foundation, the original well pit, below it.
[0006] In the above technical solution, the lower end of the wall of the original well pit has a brick lining layer, the upper end of the brick lining layer is L1 from the well opening of the original well pit, and the diameter of the well opening of the original well pit is D, where L1≥D and L1≥700mm, and the original filling layer is located inside the brick lining layer.
[0007] The beneficial effect of the above technical solution is that by removing the lining brick layer at the original wellhead and filling it with a concrete filling layer, the filling and solidification effect at the original wellhead is better.
[0008] In the above technical solution, the lower end of the concrete filling layer is located inside the lining brick layer, and the thickness of the stone layer is less than the thickness of the concrete filling layer.
[0009] The beneficial effect of the above technical solution is that it makes the upper end of the concrete filling layer thicker and the lower end thinner, which can more effectively prevent the concrete filling layer from settling.
[0010] In the above technical solution, the distance from the junction of the original filling layer and the stone layer to the original wellhead is L2, where L2≥3D and L2≥2100mm.
[0011] The beneficial effect of the above technical solution is that, under the premise of ensuring reliable filling and curing, the amount of concrete used in the concrete filling layer is reduced, thereby reducing costs.
[0012] The concrete used in the concrete filling layer and concrete cushion layer described in the above technical solution has the same strength grade.
[0013] The beneficial effect of the above technical solution is that it makes the concrete filling layer and the concrete subbase layer more integrated, thereby further preventing the concrete filling layer from settling.
[0014] In the above technical solution, the bottom area of the expanded independent column body is △S, and the wellhead area of the original well pit is S, wherein △S is not less than S.
[0015] The beneficial effect of the above technical solution is that the increased safety margin due to the enlargement of the independent column body can fully compensate for the weakness of the original well pit.
[0016] In the above technical solution, the minimum horizontal distance between the boundary of the original wellhead and the boundary of the independent column body is not less than 200mm.
[0017] The beneficial effect of the above technical solution is that it can ensure the safety of the independent column body straddling the original well pit, and avoid the possibility of well wall collapse due to uneven local stress.
[0018] The second objective of this invention is to provide an independent column assembly with a simple structure that can overcome the defects of the original well pit.
[0019] To achieve the above objectives, another technical solution of this utility model is as follows: an independent column assembly, comprising an independent column and an independent column base structure for encountering the original well pit as described above, wherein the independent column is disposed at the upper end of the independent column base body.
[0020] The beneficial effect of the above technical solution is that it enables the independent column assembly to overcome the defects of the original well pit at a lower cost, while having better reliability.
[0021] The third objective of this utility model is to provide a building with a simple structure that can overcome the defects of the original well pit.
[0022] To achieve the above objectives, another technical solution of this utility model is as follows: a building, including the above-described independent column assembly.
[0023] The advantages of the above technical solution are that it enables the independent column components of the building to overcome the defects of the original pit at a lower cost, while maintaining high reliability. Attached Figure Description
[0024] Figure 1 This is a schematic diagram showing the distribution of the original well pit relative to the foundation pit in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram illustrating the construction of independent columns in existing technologies; Figure 3 This is a schematic diagram of the hollowed-out lining brick layer and the original filling layer in the original well pit as described in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the independent column base structure for encountering the original well pit as described in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram showing that the original well pit is completely located below the designed independent column base in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram showing the original well pit portion located below the designed independent column base in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram showing the radial distance from the boundary of the original well pit to the boundary of the independent column base in Embodiment 1 of this utility model. Figure 8 This is a schematic diagram of the independent column assembly before backfilling the foundation pit as described in Embodiment 2 of this utility model; Figure 9 This is a schematic diagram of the independent column assembly after backfilling the foundation pit as described in Embodiment 2 of this utility model.
[0025] In the diagram: 1. Concrete foundation layer; 2. Independent column base; 3. Original pit; 4. Original filling layer; 5. Stone layer; 6. Concrete filling layer; 7. Lining brick layer; 10. Independent column base structure at the original pit; 20. Foundation pit; 30. Independent column. Detailed Implementation
[0026] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.
[0027] Unless otherwise defined, 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 application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0028] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.
[0029] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.
[0030] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.
[0031] Example 1 like Figure 1 As shown, this embodiment provides a structure for an independent column foundation structure with an original well pit. Specifically, after the foundation pit 20 is excavated, an original well pit 3 is found below the foundation pit 20. At this time, the construction of the concrete cushion layer 1 and the independent column foundation 2 cannot be started directly according to the design. Instead, the original well pit 3 needs to be reinforced first to ensure the reliability of the foundation below the independent column foundation 2.
[0032] In related technologies, such as Figure 2 As shown, when constructing the independent column 30, a foundation pit 20 is first excavated at the designed location. Then, a concrete cushion layer 1 is poured in the middle of the bottom wall of the foundation pit 20. Next, the basic independent column body 2 (a cast-in-place reinforced concrete component) is constructed in the middle of the upper end of the concrete cushion layer 1. Then, the independent column 30 is constructed on the upper end of the basic independent column body 2. Finally, the edges of the foundation pit 20 are backfilled. However, if an original well pit 3 is found in the foundation pit 20, the original well pit 3 is a weak point in the foundation structure. If the concrete cushion layer 1 and the basic independent column body 2 are constructed directly, the load-bearing characteristics of the independent column 30 may be affected later due to subsidence or collapse of the original well pit 3.
[0033] In related technologies, such as Figure 1 As shown, the original well pit 3 is an abandoned water intake well. Its well wall has a brick lining layer 7 (the original function of the brick lining layer 7 was to prevent the well wall from collapsing). After the original well pit 3 was abandoned, it was backfilled and buried below the surface. The backfilling of the original well pit 3 is mostly done with soil, and the backfilled part of the original well pit 3 is the original filling layer 4.
[0034] To address the issue of an existing pit 3 appearing below the foundation pit 20, this embodiment provides an independent column foundation structure 10 for encountering an existing pit (the construction process will also be briefly introduced). This embodiment is applicable when the existence of an existing pit 3 underground at the location of the independent column 30 is unknown during the initial building design, but is discovered after the foundation pit 20 is excavated according to the design. After the existence of the existing pit 3 is discovered, since the building design has already been finalized, the design position of the independent column 30 will not be moved. At this time, remedial measures can only be considered to improve the reliability of the foundation at the lower end of the independent column foundation body 2.
[0035] See details Figure 1 , Figure 3 and Figure 4 As shown, the original pit 3 is first partially emptied, that is, the original filling layer 4 at the upper end of the original pit 3 is removed. At this time, part of the original filling layer 4 is still retained at the lower end of the original pit 3. Then, a stone layer 5 is filled into the original pit 3 and compacted. Then, a concrete filling layer 6 is filled (the concrete filling layer 6 is cast in place and needs to be vibrated after filling to improve the compaction). The original pit 3 is filled with the original filling layer 4, the stone layer 5 and the concrete filling layer 6 from bottom to top. The raw material of the stone layer 5 is mainly crushed stone and / or rubble. The upper end of the concrete filling layer 6 needs to be flush with the opening of the original pit 3.
[0036] See details Figure 1 , Figure 3 and Figure 4 As shown, since the lining bricks of the lining brick layer 7 are prone to pulverization due to their texture and age, their density is usually poor. Therefore, in this embodiment, during the partial hollowing out of the original filling layer 4 in the original pit 3, the upper part of the lining brick layer 7 can also be partially removed. The hollowing out depth of the lining brick layer 7 can be less than the hollowing out depth of the original filling layer 4. This reduces the amount of material used in the stone layer 5 and the concrete filling layer 6, thereby reducing costs. At the same time, it makes the upper part of the concrete filling layer 6 thicker, thus avoiding the possibility of the concrete filling layer 6 settling later.
[0037] For details, please see Figure 1 , Figure 3 and Figure 4As shown, in this embodiment, the distance from the upper end of the lining brick layer 7 to the opening of the original well pit 3 is L1, and the diameter of the opening of the original well pit 3 is D. L1 must simultaneously satisfy the following two conditions: L1 ≥ D, and L1 ≥ 700 mm. In this embodiment, the distance from the junction of the original filling layer 4 and the stone layer 5 to the opening of the original well pit 3 is L2. L2 must simultaneously satisfy the following two conditions: L2 ≥ 3D, and L2 ≥ 2100 mm. In this embodiment, the lower end of the concrete filling layer 6 is located within the lining brick layer 7. The thickness of the stone layer 5 is less than the thickness of the concrete filling layer 6 (the thickness of the concrete filling layer 6 must be greater than L1). In this embodiment, the compacted thickness of the stone layer 5 is at least 200 mm (wherein the stone layer 5 serves as the foundation of the concrete filling layer 6, which can improve the bearing capacity of the original filling layer 4 and further prevent the concrete filling layer 6 from settling). This ensures that the depth of the original filling layer 4 is not less than three times the depth of the lining layer 7, and the depth of the lining layer 7 is not less than the diameter of the original pit 3 opening (and not less than 700mm). This improves the overall reliability of the filling and solidification of the original pit 3. At the same time, the concrete filling layer 6 is thick at the top and thin at the bottom. In this case, the concrete filling layer 6 is similar to being upside down in the original pit 3, which further reduces the possibility of the concrete filling layer 6 sinking.
[0038] Specifically, such as Figure 3 As shown, in this embodiment, L1 and L2 can also be understood as the depth of hollowing out the lining brick layer 7 and the original filling layer 4 after the foundation pit 20 is dug. In this embodiment, the hollowing out depth of the lining brick layer 7 is less than the hollowing out depth of the original filling layer 4, which can also reduce the amount of concrete used in the concrete filling layer 6 as much as possible, so as to reduce costs.
[0039] To improve the filling and solidification effect of the original pit 3, after removing part of the lining brick layer 7, the opening of the original pit 3 can be expanded outward in a funnel shape. This can further remove the relatively loose soil at the edge of the opening of the original pit 3, and finally fill it with concrete filling layer 6. This can further thicken the upper end of concrete filling layer 6, thereby further reducing the possibility of concrete filling layer 6 sinking.
[0040] like Figures 4-7 As shown, after the original well pit 3 is filled and cured, if the original well pit 3 is located directly below the designed position of the independent column base 2 or partially located directly below the independent column base 2, then the concrete pad 1 and the independent column base 2 need to be enlarged relative to the design parameters to ensure that the original well pit 3 can completely cover the bottom of the independent column base 2 (see details). Figure 5 and Figure 6(As shown). If the original pit 3 is located at the edge of the foundation pit 20 and is completely outside the designed position of the independent column base 2, then there is no need to consider enlarging the independent column base 2 and the concrete cushion 1. Construction can be carried out according to the design parameters (this situation is not within the scope of this embodiment).
[0041] In this embodiment, the expansion of the independent column base 2 and the concrete cushion layer 1 must simultaneously meet the following three conditions: Condition 1: Ensure that both the independent column base 2 and the concrete cushion layer 1 completely cover the original well pit 3; Condition 2: The expanded bottom area of the independent column base 2 is △S (which is the difference between the expanded bottom area of the independent column base and the original bottom area during design), and the wellhead area of the original well pit 3 is S, wherein △S is not less than S; Condition 3: The minimum horizontal distance between the boundary of the original wellhead 3 and the boundary of the independent column base 2 is not less than 200mm (e.g., Figure 7 As shown, the minimum distance L from the boundary of the original wellhead 3 to the boundary of the independent column base 2 along the radial direction is... min (Not less than 200mm).
[0042] When the independent column base 2 meets the above three conditions at the same time, it can achieve sufficient strength compensation for the weak support point at the original pit 3 (equivalent to the independent column base 2 having redundant strength design); and ensure that the independent column base 2 straddles the original pit 3. At this time, even if the concrete filling layer 6 in the original pit 3 sinks, the independent column base 2 will not sink accordingly.
[0043] In this embodiment, the independent column base 2 is always located in the middle of the upper end of the concrete cushion layer 1, that is, the edge of the concrete cushion layer 1 will be outside the independent column base 2.
[0044] In this embodiment, the concrete filling layer 6 and the concrete cushion layer 1 use concrete of the same strength grade. Of course, the concrete filling layer 6 and the concrete cushion layer 1 can also be poured at the same time, so that the concrete filling layer 6 and the concrete cushion layer 1 can be formed as one piece, reducing the construction process, and at the same time, the concrete filling layer 6 can be hung on the bottom wall of the foundation pit 20 through the concrete cushion layer 1.
[0045] The strength grade of the concrete used in the concrete cushion layer 1 and the independent column base body 2 described in this embodiment is determined according to the design and specifications, and will not be elaborated here.
[0046] Example 2 like Figure 8 and Figure 9As shown, this embodiment provides an independent column assembly, including an independent column 30 and an independent column base structure 10 for encountering the original well pit as described in Embodiment 1. The independent column 30 is disposed at the upper end of the independent column base 2 (the independent column 30 is constructed at the corresponding position at the upper end of the independent column base 2 according to the design). This allows the independent column assembly to overcome the defects of the original well pit 3 at a lower cost, while having better reliability.
[0047] In this embodiment, the horizontal height of the upper end of the independent column base body 2 is also lower than the horizontal height of the pit opening of the foundation pit 20. This allows the concrete cushion layer 1 and the independent column base body 2 to be completely buried underground during the backfilling of the foundation pit 20, while only the independent column 30 protrudes above the ground.
[0048] Example 3 This embodiment provides a building including the independent column assembly as described in Embodiment 2. This allows the independent column assembly of the building to overcome the shortcomings of the original pit 3 at a lower cost, while maintaining high reliability.
[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An independent column foundation structure for an existing well pit, comprising a concrete cushion layer (1) and an independent column base (2) disposed within the pit (20), wherein the concrete cushion layer (1) is disposed on the bottom wall of the pit (20), and the independent column base (2) is disposed at the middle of the upper end of the concrete cushion layer (1), wherein the independent column base (2) is a cast-in-place reinforced concrete component, characterized in that, Below the foundation pit (20) there is also an original well pit (3), and the wellhead of the original well pit (3) penetrates the bottom wall of the foundation pit (20). The original well pit (3) is filled from bottom to top with an original filling layer (4), a stone layer (5) and a concrete filling layer (6); the concrete cushion layer (1) and the independent column base body (2) both extend outward and cover the original well pit (3).
2. The independent column base structure for encountering original well pits according to claim 1, characterized in that, The lower end of the wall of the original pit (3) has a brick lining layer (7), the upper end of the brick lining layer (7) is L1 away from the wellhead of the original pit (3), the diameter of the wellhead of the original pit (3) is D, where L1≥D and L1≥700mm, and the original filling layer (4) is located inside the brick lining layer (7).
3. The independent column base structure for encountering original well pits according to claim 2, characterized in that, The lower end of the concrete filling layer (6) is located inside the brick lining layer (7), and the thickness of the stone layer (5) is less than the thickness of the concrete filling layer (6).
4. The independent column foundation structure for encountering original well pits according to claim 2, characterized in that, The distance from the junction of the original filling layer (4) and the stone layer (5) to the wellhead of the original pit (3) is L2, where L2≥3D and L2≥2100mm.
5. The independent column foundation structure for encountering original well pits according to claim 1, characterized in that, The concrete used in the concrete filling layer (6) and the concrete cushion layer (1) has the same strength grade.
6. The independent column base structure for encountering original well pits according to claim 1, characterized in that, The bottom area of the expanded independent column base (2) is △S, and the wellhead area of the original pit (3) is S, wherein △S is not less than S.
7. The independent column foundation structure for encountering original well pits according to claim 1, characterized in that, The minimum horizontal distance between the boundary of the original pit (3) and the boundary of the independent column body (2) shall not be less than 200 mm.
8. A freestanding column assembly, characterized in that, It includes an independent column (30) and an independent column base structure (10) for encountering an original well pit as described in any one of claims 1-7, wherein the independent column (30) is disposed at the upper end of the independent column base body (2).
9. A building, characterized in that, Includes the independent column assembly as described in claim 8.