Cooling tower ring foundation structure suitable for non-uniform foundation
By using rubble concrete replacement masonry layers and stepped or sloping connection structures on uneven foundations, the bearing capacity problem of cooling tower foundations under uneven foundations was solved, achieving safe and economical cooling tower construction.
Patent Information
- Application Number
- CN202520094681.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-15
AI Technical Summary
Existing foundation schemes are difficult to achieve high bearing capacity under uneven geological conditions, especially in the case of foundations with alternating basalt and silt, where the foundation treatment of the cooling tower ring foundation is difficult to meet the requirements.
The design adopts a rubble concrete replacement masonry layer, combined with a stepped or sloping connection structure, to enhance the contact area and interlocking effect between the rubble concrete and the rock. The stepped structure evenly transfers the load and reduces the risk of stress concentration.
It improves the overall bearing capacity of the cooling tower foundation, reduces the risk of structural damage, achieves safety and stability under uneven geological conditions, and reduces construction difficulty and cost.
Smart Images
Figure CN223723782U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of cooling tower, and particularly relates to a cooling tower ring foundation structure suitable for uneven foundation. BACKGROUND
[0002] At present, high-parameter large-capacity thermal power generating units become a major development direction of China's energy and power industry, and the development of large-capacity thermal power generating units urgently needs to build larger cooling towers. With the increase of the volume of the cooling tower, the bearing capacity requirement of the cooling tower foundation is also increased, especially under uneven geological conditions (the uneven foundation is usually the case that one part is basalt and the other part is backfill silt soil), which requires higher requirements and corresponding solutions. The replacement scheme under the cooling tower ring foundation (annular foundation) determines the cost and safety. How to select an economic and safe foundation treatment scheme and how to deal with basalt and replacement of rubble concrete are critical. Therefore, a cooling tower ring foundation treatment form suitable for uneven foundation is needed to adapt to and meet the demand of cooling tower foundation treatment under uneven foundation. SUMMARY
[0003] The utility model solves the technical problems that: provide a kind of cooling tower ring foundation structure suitable for uneven foundation, solve the problem that the existing foundation scheme is difficult to achieve higher bearing capacity under uneven geological conditions, realize the demand of adapting to and meeting the demand of cooling tower foundation treatment under uneven foundation.
[0004] According to the technical scheme of the utility model, the utility model provides a kind of cooling tower ring foundation structure suitable for uneven foundation, including the annular foundation groove that is recessed from ground downwards;In the base groove bottom area, one part is thick basalt area, one part is thin basalt area, and another part is silt soil area;Rubble concrete replacement masonry layer is provided in thin basalt area and silt soil area, and the rubble concrete replacement masonry layer is in the form of stepped structure with lower width and upper narrowness, and concrete cushion layer is provided on the top of the rubble concrete replacement masonry layer, and annular foundation is located above the concrete cushion layer.
[0005] Further, in the thin basalt area, the lower part of the rubble concrete replacement masonry layer is basalt layer after excavating part of basalt or silty clay layer after excavating all basalt;In the silt soil area, the lower part of the rubble concrete replacement masonry layer is silty clay layer after excavating soft soil layer, silt and silty sand.
[0006] Further, the thickness of the rubble concrete replacement masonry layer is 4m-6m.
[0007] Further, the side of the foundation trench is a slope surface with a slope, the stepped structure of the rubble concrete replacement masonry layer has three layers, and the lowermost layer is matched and attached to the slope surface; the coverage of the concrete cushion layer is smaller than the uppermost layer of the rubble concrete replacement masonry layer, and the coverage of the bottom surface of the ring foundation is smaller than the concrete cushion layer.
[0008] Further, the outer side and the upper side of the rubble concrete replacement masonry layer in the foundation trench are provided with a plain fill layer, the position of the concrete cushion layer is lower than the ground outside the foundation trench, and the bottom of the ring foundation is located in the plain fill layer; and the thick basalt area is a natural foundation.
[0009] Further, the rubble concrete replacement masonry layer has a connecting part near the thick basalt area, the connecting part is in a stepped shape or a slope shape, and the upper part of the connecting part is closer to the thick basalt area than the lower part of the connecting part.
[0010] Further, in at least a part of the thin basalt area, the lower part of the rubble concrete replacement masonry layer is sequentially provided with an intermediate silty clay layer and a deep basalt layer.
[0011] Further, the side of the stepped shape or the slope shape of the connecting part is a slope, and the slope rate is not less than 1:0.5.
[0012] Compared with the prior art, the beneficial technical effects of the present application are as follows:
[0013] The cooling tower ring foundation structure suitable for uneven foundations provided by the present application mainly aims at uneven foundations, i.e., a part of the foundation is basalt and another part of the foundation is backfill silt soil, and proposes a new replacement treatment scheme, the rubble concrete and the original rock can be connected in a stepped shape or a slope shape, the contact area between the rubble concrete and the rock can be increased, the horizontal shear force can be effectively resisted, and the stability of the foundation can be enhanced; secondly, the interface in the stepped shape or the slope shape can make the rubble concrete and the rock better engaged together; when the structure is subjected to a vertical load, through the engagement, the load can be more uniformly transmitted from the rubble concrete to the rock foundation, the overall bearing capacity of the foundation structure is improved; the stepped shape or the slope shape connection can make the stress more gently transition between the rubble concrete and the rock; this helps to reduce the stress concentration phenomenon and reduce the risk of structure damage caused by excessive local stress; thus, the cooling tower foundation under uneven geological conditions can be constructed, the bearing capacity of the cooling tower foundation is better, a larger cooling tower can be constructed, the safety is better, the structure is simple, the construction difficulty and cost are relatively low, and the application is easy to implement. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is a top view structural schematic diagram of the foundation structure provided by the present application.
[0015] Figure 2 is a sectional view structure schematic diagram of one side of the foundation structure provided by the utility model.
[0016] Figure 3 is a sectional view structure schematic diagram of the connection part and the peripheral area thereof provided by the utility model.
[0017] Figure 4 is a sectional view structure schematic diagram of another connection part and the peripheral area thereof provided by the utility model.
[0018] Figure 5 is a dimensioned drawing of the structure shown in one embodiment of the utility model. Figure 2
[0019] Figure 6 is a dimensioned drawing of the structure shown in one embodiment of the utility model. Figure 3
[0020] Figure 7 is a dimensioned drawing of the structure shown in one embodiment of the utility model. Figure 4 Explanation of reference numerals in the drawings:
[0021] 1, thick basalt area; 2, thin basalt area; 3, silt soil area; 4, rubble concrete replacement masonry layer; 5, concrete cushion layer; 6, ring foundation; 7, plain fill layer; 8, connection part; 201, shallow basalt layer; 202, intermediate silty clay layer; 203, deep basalt layer.
[0022] DETAILED DESCRIPTION The utility model provides a kind of cooling tower ring foundation foundation structure suitable for uneven ground, solve the problem that existing foundation scheme is difficult to achieve higher bearing capacity under uneven geological conditions, realize the demand of adapting and meeting under uneven ground cooling tower foundation treatment.For different geological conditions of lower part of cooling tower, especially the uneven thickness of basalt, since the bearing capacity and deformation of fill and silty clay weak soil layer, silt, silt sand formation cannot meet the requirements, and ground soil is uneven, it can produce larger uneven settlement.For this, a typical solution proposed by the utility model is: after all fill silty clay weak soil layer, silt, silt sand is removed, start replacement rubble concrete from the top surface of silty clay to foundation bottom surface elevation, rubble concrete masonry thickness is about 4~6m, step type, foundation treatment planar arrangement drawing is as shown in , sectional view is as shown in
[0023] 、 Figure 1 . Figure 2 Figure 6 .
[0024] Please refer to Figure 1 、 Figure 2 This utility model discloses a cooling tower annular foundation structure suitable for uneven foundations, comprising an annular trench recessed downwards from the ground, with a foundation formed at the bottom of the trench, upon which a cooling tower (e.g., an indirect cooling tower) is installed. In the bottom region of the trench, a portion is a thick basalt region 1, a portion is a thin basalt region 2, and a portion is a silt region 3. Figure 1 The Chinese version simplifies this to three regions similar to a pie chart. Understandably, the actual regional distribution may be more complex, for example, with more than three regions, where several regions distributed in different locations are thin basalt regions 2, and so on, but the processing method is the same.
[0025] Both the thin basalt area 2 and the silt soil area 3 have rubble concrete replacement masonry layers 4. These layers 4 have a stepped structure, wider at the bottom and narrower at the top. A concrete cushion layer 5 is placed on top of the rubble concrete replacement masonry layer 4, and a ring foundation 6 is located above the concrete cushion layer 5. The stepped structure refers to... Figure 2 The shapes shown in the sectional view, in terms of the overall structure, are all annular, including the rubble concrete replacement masonry layer 4, the concrete cushion layer 5, the ring foundation 6, and the foundation trench, and the annularities of these structures match (for example, from...). Figure 1 From the top-down view shown, the central radii of each ring are the same and their centers coincide.
[0026] More specifically, Figure 1 The image shows seven concentric circles from the outside in, representing: the outer boundary line of the top excavation of the foundation trench, the outer boundary line of the bottom excavation of the foundation trench, the outer circle of the ring foundation, the circle at the center of the ring foundation (dashed line), the inner circle of the ring foundation, the inner boundary line of the bottom excavation of the foundation trench, and the inner boundary line of the top excavation of the foundation trench.
[0027] Please also refer to Figure 2 , Figure 6 The sides of the trench are sloping surfaces with a gradient, corresponding to the excavation lines in the sectional view. The sloping surfaces correspond to the area between the outer boundary line of the top excavation and the outer boundary line of the bottom excavation, as well as the area between the inner boundary line of the bottom excavation and the inner boundary line of the top excavation.
[0028] In thin basalt area 2, below the rubble concrete replacement masonry layer 4 is a basalt layer after partial or complete removal of basalt; more specifically, it is a basalt layer less than 2 meters thick that has been removed. In silt area 3, below the rubble concrete replacement masonry layer 4 is a silty clay layer after removal of weak soil, silt, and silty sand.
[0029] The stepped structure of the rubble concrete replacement masonry layer 4 has three layers, and the lowermost layer is matched with the slope surface. The thickness (or height) of the upper two layers is, for example, about 1500mm, and the overall thickness (or height) of the rubble concrete replacement masonry layer 4 is, for example, 4m-6m; the step width between layers is, for example, about 625mm. The coverage of the concrete cushion layer 5 is less than the uppermost layer of the rubble concrete replacement masonry layer 4, and the coverage of the bottom surface of the annular foundation 6 is less than the concrete cushion layer 5. From the cross-sectional view, the overall is ladder-shaped, and the bearing stress is stable.
[0030] Further, in the foundation trench, there is a plain fill layer 7 on the outside and above the rubble concrete replacement masonry layer 4, the position of the concrete cushion layer 5 is lower than the ground outside the foundation trench, and the bottom of the annular foundation 6 is located in the plain fill layer 7, so that the annular foundation 6 is buried deep enough, and the final ground surface is flat. In this embodiment, the rubble concrete replacement masonry layer 4 uses C20 rubble concrete; the concrete cushion layer 5 uses C15 plain concrete, and the thickness is about 100mm; the upper end surface of the concrete cushion layer 5 is about 6.5m lower than the ground outside the foundation trench.
[0031] The thick basalt area 1 is a natural foundation, that is, the bottom of the foundation trench is basalt, so it does not need to be replaced and does not need to be provided with a rubble concrete replacement masonry layer 4. The specific structure and treatment method of the natural foundation can be used in the prior art, for example, the depth of the foundation trench in the thick basalt area 1 is shallow, and the upper end surface of the rubble concrete replacement masonry layer 4 in the remaining part is flush, and then the concrete cushion layer 5 and the annular foundation 6 and the like above are continuously provided on the same horizontal plane.
[0032] It should be noted that the thick basalt area in the utility model refers to the area where the basalt is relatively thick, which meets the bearing requirement and can be used as a natural foundation; correspondingly, the thin basalt area refers to the area where the basalt is relatively thin, for example, the thickness of the basalt layer is less than 2m, and / or the basalt is relatively thin and has a weak layer below, which cannot be used as a natural foundation and needs to be replaced and provided with a rubble concrete replacement masonry layer 4.
[0033] Please refer to Figure 3 , Figure 4, the rubble concrete replacement masonry layer 4 has a connecting part 8 near the thick basalt area 1, the connecting part 8 is in a stepped or inclined shape, and the upper part of the connecting part 8 is closer to the thick basalt area 1 than the lower part of the connecting part 8 (in other words, in a structure similar to an inverted trapezoidal shape). For how to deal with different foundations, such as how to deal with the connecting part between the basalt and the replaced rubble concrete, the utility model proposes the above connecting part scheme, and more specifically, when the basalt is relatively thin and there is a weak layer below, the stepped scheme can be used to increase the connecting force between the replaced rubble concrete and the basalt when the basalt layer connected therewith is relatively thin; when connected with a relatively thick basalt layer, a certain proportion of slope can be used to increase the connecting force between the replaced rubble concrete and the basalt.
[0034] More specifically, for some uneven foundation conditions, in at least a part of the thin basalt area 2, after excavating the foundation trench, the shallow basalt layer 201, the intermediate silty clay layer 202 (weak layer) and the deep basalt layer 203 are sequentially arranged below the trench bottom. Further, based on the foregoing scheme of the utility model, the shallow basalt layer 201 is all or partially excavated, and then the rubble concrete replacement masonry layer 4 is arranged, and the intermediate silty clay layer 202 and the deep basalt layer 203 are sequentially arranged below the rubble concrete replacement masonry layer 4. Further, the side surfaces of the stepped or inclined shape of the connecting part 8 are all inclined, and the slope rate is not less than 1:0.5.
[0035] For Figure 3 , Figure 6 The first connecting method shown in the figure, the connecting part 8 is in a stepped shape, and there are two layers, and the thickness of each layer is about 1m; at the position where the lower layer of the step is shorter than the upper layer of the step, a part of the shallow basalt layer 201 may be retained. The stepped shape or side surface (the surface opposite to the vertical surface) of the connecting part 8 is inclined (the inclined surface has an angle with the vertical direction), and the minimum excavation slope rate is 1:0.5. Further, Figure 6 The middle ① layer is a plain fill layer, the ③ layer is a shallow basalt layer, the ④ layer is an intermediate silty clay layer, and the ⑤ layer is a deep basalt layer; Figure 6 The cushion bottom elevation of-6.6m corresponds to Figure 5 The top elevation of the rubble concrete replacement masonry layer 4 is-6.6m; the natural ground below the thick basalt area 1 is the basalt layer (shallow basalt layer), the concrete cushion 5 can be arranged by excavating to the cushion bottom elevation, and the plain fill layer 7 and the final tower inner leveling ground elevation can be finally arranged; and the original shallow basalt layer and part of the intermediate silty clay layer on the surface are excavated in the thin basalt area 2 underground, and then the rubble concrete replacement masonry layer is formed by replacement.
[0036] For Figure 4 , Figure 7 The second connecting method shown in the figure, the connecting part 8 is in an inclined shape, and the minimum excavation slope rate is 1:0.5. In addition, in this embodiment, Figure 7The layer ② in the above formula is silt (a weak layer), so the silt (and the silt and the thin shallow basalt layer if any) is dug out to the silty clay layer, and then the rubble concrete replacement layer is formed.
[0037] In summary,
[0038] The cooling tower foundation structure suitable for uneven foundation provided by the utility model mainly aims at uneven foundation, that is, a part is basalt and another part is backfill silt foundation, and proposes a new replacement treatment scheme, the rubble concrete and the original rock can be connected in a ladder type or slope shape, the contact area between the rubble concrete and the rock can be increased, the horizontal shear force can be effectively resisted, and the stability of the foundation can be enhanced; secondly, the interface in the ladder type or slope shape can make the rubble concrete and the rock better engaged together; when the structure is subjected to vertical load, through the engagement, the load can be more uniformly transmitted from the rubble concrete to the rock foundation, the overall bearing capacity of the foundation structure is improved; the ladder type or slope shape connection can make the stress more gently transition between the rubble concrete and the rock; this helps to reduce the stress concentration phenomenon and reduce the risk of structure damage caused by excessive local stress; so that the cooling tower foundation under uneven geological conditions can be constructed, the bearing capacity of the cooling tower foundation is better, a larger volume of cooling tower can be constructed, the safety is better, the structure is simple, the construction difficulty and cost are relatively low, and the utility model is easy to implement and apply.
Claims
1. A cooling tower ring foundation structure suitable for use on uneven ground, characterized in that, The annular foundation (6) is located above the concrete cushion layer (5).
2. The cooling tower ring foundation structure suitable for uneven ground according to claim 1, wherein, In the thin basalt area (2), the lower part of the rubble concrete replacement masonry layer (4) is the basalt layer after the removal of part of the basalt or the silty clay layer after the removal of all the basalt; In the silt soil area (3), the lower part of the rubble concrete replacement masonry layer (4) is the silty clay layer after the removal of soft soil, silt and silty sand.
3. The cooling tower ring foundation structure suitable for uneven ground according to claim 1, wherein, The thickness of the rubble concrete replacement masonry layer (4) is 4-6 m.
4. The cooling tower ring foundation structure suitable for uneven ground according to claim 1, wherein, The side of the foundation trench is a slope surface with a slope, the stepped structure of the rubble concrete replacement masonry layer (4) has three layers, and the lowermost layer is matched with the slope surface; the coverage of the concrete cushion layer (5) is smaller than the uppermost layer of the rubble concrete replacement masonry layer (4), and the coverage of the bottom surface of the annular foundation (6) is smaller than the concrete cushion layer (5).
5. The cooling tower ring foundation structure suitable for uneven ground according to claim 1, wherein, In the foundation trench, the outer side and the upper part of the rubble concrete replacement masonry layer (4) have a plain fill layer (7), the position of the concrete cushion layer (5) is lower than the ground outside the foundation trench, and the bottom of the annular foundation (6) is located in the plain fill layer (7); the thick basalt area (1) is a natural foundation.
6. A cooling tower ring foundation structure suitable for uneven ground according to any one of claims 1 to 5, characterized in that, The rubble concrete replacement masonry layer (4) has a connecting part (8) near the thick basalt area (1), the connecting part (8) is in the shape of a ladder or a slope, and the upper part of the connecting part (8) is closer to the thick basalt area (1) than the lower part of the connecting part (8).
7. The cooling tower ring foundation structure suitable for uneven ground according to claim 6, wherein In at least a part of the thin basalt area (2), the lower part of the rubble concrete replacement masonry layer (4) is sequentially the intermediate silty clay layer (202) and the deep basalt layer (203).
8. The cooling tower ring foundation structure suitable for uneven ground according to claim 6, wherein The side of the ladder or slope shape of the connecting part (8) is a slope, and the slope rate is not less than 1:0.5.