Greenhouse supporting foundation for sludge foundation pit
By drilling the base piles into the silted foundation pit and laying multi-layer concrete bases, the problem of glass greenhouses being prone to deform or collapse on silted soil is solved, and higher bearing capacity and lower construction risks and costs are achieved.
Patent Information
- Application Number
- CN202420431039.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-03-06
AI Technical Summary
Glass greenhouses are prone to deformation or collapse on the basis of silted soil or soft soil. The existing deep replacement methods have problems such as high safety risks, high construction costs and long cycles.
Punch the bottom base piles into the silt foundation pit, lay sand and gravel cushions and multi-layer concrete bases, and the bottom base piles are arranged in rows and interlaced, and the C15 and C30 concrete layers are used to improve the bearing capacity, and a transverse reinforcement net is installed on the second concrete base layer. and prefabricated base piers to enhance structural strength.
It significantly improves the foundation bearing capacity, shortens the construction cycle, reduces construction risks, and reduces costs.
Smart Images
Figure CN222314059U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of agricultural greenhouse construction, in particular to a greenhouse support foundation used for a muddy foundation pit. Background Art
[0002] Glass greenhouses usually include steel structure frames, walls and bottom foundations. As glass greenhouses have a large self-weight, they require a high bearing capacity for the bottom foundation. If the underlying strata are silty soil or soft soil, the bearing capacity of these weak foundations will not be able to bear the weight of the glass greenhouse, resulting in deformation or even collapse of the greenhouse in the later stage.
[0003] At present, the commonly used method to strengthen the bearing capacity of foundation is deep filling. Although this method can improve the bearing capacity of foundation in silty soil or soft soil areas to a certain extent, it has great limitations:
[0004] On the one hand, this operation method requires the excavation of all the original soft soil or silty soil. The excavation depth is generally large, and there is soft soil all around. As the development depth increases, the risk of landslides is greater and the safety hazard is high. In order to avoid risks, it is necessary to expand the excavation area and carry out gentle slope excavation. This will undoubtedly increase the amount of work, increase costs and construction period, and require a sufficiently open site to meet the needs of expanding the excavation area. Another way to avoid the risk of landslides is to use large machinery to build steel sheet pile supports. When it comes to large machinery operations, it is also necessary to build an operating platform first, and the use of steel sheet pile supports itself also has certain safety hazards of collapse.
[0005] On the other hand, deep replacement usually adopts the C15 rubble concrete replacement method, which requires excavation to form a foundation pit and then pouring concrete. It will face problems such as difficult formation of the foundation pit, high safety risks in deep foundation pit operations, large amount of concrete consumption, and high cost. Utility Model Content
[0006] The purpose of the utility model is to provide a greenhouse support foundation for a muddy foundation pit. By driving bottom foundation piles into the foundation pit and laying a sand and gravel cushion layer, a first concrete base layer and a second concrete base layer on the bottom foundation piles, the bearing capacity of the foundation is greatly enhanced, solving the problems of high safety risks, high construction costs and long periods in the existing foundation reinforcement methods of deep replacement.
[0007] In order to solve the above technical problems, the utility model is realized by the following technical solutions:
[0008] The utility model is a greenhouse support foundation for a muddy foundation pit, comprising a plurality of bottom foundation piles, a sand and gravel cushion layer, a first concrete base layer and a second concrete base layer. The lower ends of the plurality of bottom foundation piles are arranged and inserted into the ground through the muddy foundation pit. The sand and gravel cushion layer is compacted above the bottom foundation piles. The first concrete base layer is cast above the sand and gravel cushion layer, and the second concrete base layer is cast above the first concrete base layer.
[0009] As a preferred technical solution of the utility model, a plurality of the bottom foundation piles are inserted into the ground in rows, and the bottom foundation piles in two adjacent rows are arranged in a staggered manner, thereby ensuring the uniformity of the arrangement of the bottom foundation piles within a unit area, so that the bottom foundation has a more uniform bearing capacity.
[0010] As a preferred technical solution of the utility model, the length of the bottom pile is 3 to 5 meters, the diameter of the upper end surface of the bottom pile is not less than 150 mm, and the distance between two adjacent bottom piles is 300 to 600 mm.
[0011] As a preferred technical solution of the present utility model, the bottom piles are wooden piles.
[0012] As a preferred technical solution of the present utility model, the thickness of the sand and gravel cushion layer is 200 to 500 mm.
[0013] As a preferred technical solution of the present utility model, the first concrete base layer adopts a C15 concrete base layer, and the thickness of the first concrete base layer is 80 to 120 mm.
[0014] As a preferred technical solution of the present utility model, the second concrete base layer adopts a C30 concrete base layer, and the thickness of the second concrete base layer is 300 to 700 mm.
[0015] As a preferred technical solution of the utility model, the upper end of the bottom foundation pile extends into the sand and gravel cushion layer by 100 to 200 mm.
[0016] As a preferred technical solution of the present utility model, a transverse steel mesh layer is provided at the bottom of the second concrete base.
[0017] As a preferred technical solution of the present utility model, a number of prefabricated piers are cast above the second concrete base; longitudinal supporting steel bars are inserted into the second concrete base, the longitudinal supporting steel bars extend out of the second concrete base, and the prefabricated piers are cast on the longitudinal supporting steel bars; the prefabricated piers are C30 concrete piers.
[0018] The utility model has the following beneficial effects:
[0019] The utility model drives bottom foundation piles into a foundation pit, the bottom foundation piles are inserted into the ground in rows, two adjacent rows of bottom foundation piles are arranged alternately, a sand and gravel cushion layer is laid on the bottom foundation piles and compacted and leveled, a first concrete base layer of C15 concrete and a second concrete base layer of C30 concrete are poured on the sand and gravel cushion layer, thereby ensuring the bearing capacity of the bottom base layer and having the advantages of short construction period and low construction risk.
[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0022] Figure 1 It is a cross-sectional view of the greenhouse support foundation used for the muddy foundation pit in Example 1;
[0023] Figure 2 It is a cross-sectional view of the greenhouse support foundation and the prefabricated pier in Example 1;
[0024] Figure 3 It is a cross-sectional view of the greenhouse support foundation used for the muddy foundation pit in the second embodiment;
[0025] Figure 4 This is a structural diagram of the bottom pile arrangement;
[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0027] 1-sand and gravel cushion layer, 2-first concrete base layer, 3-second concrete base layer, 301-transverse steel mesh layer, 302-longitudinal supporting steel bars, 4-prefabricated foundation pier, 5-bottom piles. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] In the description of the present invention, it should be understood that terms such as "arrangement", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0030] The construction terrain of the glass greenhouse is relatively complex, and the bearing capacity of the bottom foundation is required to be high. It often faces construction conditions where the underlying strata are silty soil or soft soil. The bearing capacity of these weak foundations will not be able to bear the weight of the glass greenhouse, resulting in deformation or even collapse of the greenhouse in the later stage. At present, the commonly used method to strengthen the bearing capacity of the foundation is deep filling. Although this method can improve the foundation bearing capacity of silty soil or soft soil areas to a certain extent, it has high safety risks, high construction costs, and long construction periods. Based on this, the present embodiment provides a greenhouse support foundation for a silty foundation pit.
[0031] Embodiment 1
[0032] The greenhouse support foundation for a muddy foundation pit provided in this embodiment is mainly used for a shallow mud foundation pit with a foundation pit depth of 200 mm to 500 mm.
[0033] See also Figure 1 As shown, the support foundation includes a gravel cushion layer 1, a first concrete base layer 2 and a second concrete base layer 3. In this embodiment, a possible construction sequence is:
[0034] First, the gravel cushion layer 1 is poured into the silt foundation pit and compacted in the foundation pit by a pile driver or a roller. The thickness of the gravel cushion layer 1 is 500 mm, and the layer is 50 to 100 mm higher than the foundation pit. The gravel cushion layer 1 as the bottom foundation should ensure its flatness.
[0035] Subsequently, a 100 mm thick first concrete base layer 2 is poured above the sand and gravel cushion layer 1. The first concrete base layer 2 adopts a C15 concrete base layer. Although the strength grade of C15 concrete is low, it still has good durability and can withstand a certain pressure and water evaporation while maintaining good elasticity and durability. It is not easy to break and crack, and the material cost is low.
[0036] Finally, a 500mm second concrete base 3 is poured above the first concrete base 2. The second concrete base 3 uses a C30 concrete base. The elastic modulus of C30 concrete is greater than that of C15 concrete, and the anti-fatigue deformation modulus is also greater than that of C15 concrete, which means that C30 concrete has better deformation performance when subjected to force, and has better durability when subjected to cyclic loads. In addition, a transverse steel mesh layer 301 is provided at the bottom of the second concrete base 3 to enhance the structural strength of the first concrete base 2.
[0037] Also, see Figure 2 As shown, a plurality of prefabricated piers 4 for installing greenhouse columns are also cast above the second concrete base 3. The position and number of the prefabricated piers 4 are determined according to the position of the greenhouse columns. To ensure the firmness of the connection between the prefabricated piers 4 and the second concrete base 3, when the second concrete base 3 is cast, a longitudinal support steel bar 302 is inserted into the reserved position of the prefabricated pier 4. The longitudinal support steel bar 302 extends out of the second concrete base 3, and the prefabricated pier 4 is cast on the longitudinal support steel bar 302. The prefabricated pier 4 is also cast with C30 concrete.
[0038] Embodiment 2
[0039] Based on the first embodiment, the second embodiment is different in that:
[0040] The greenhouse support foundation for a muddy foundation pit provided in this embodiment is mainly used for deep mud foundation pits with a foundation pit depth of more than 500 mm.
[0041] See also Figure 3 As shown, the supporting foundation includes, from bottom to top, a bottom pile 5, a gravel cushion layer 1, a first concrete base layer 2, a second concrete base layer 3 and a prefabricated foundation pier 4.
[0042] The bottom piles 5 are preferably made of wood, such as pine, which has good corrosion resistance and can also be coated with anti-corrosion paint on their surfaces.
[0043] The length of the bottom pile 5 is 3-5 meters, which is specifically selected according to the depth of the foundation pit. The diameter of the upper end surface of the bottom pile 5 is not less than 150 mm, and the distance between two adjacent bottom piles 5 is 300-600 mm.
[0044] During construction, the lower end of the bottom pile 5 is first inserted into the ground through the muddy foundation pit. The arrangement is as follows: Figure 4 As shown, the bottom piles 5 are inserted into the ground in rows, and the bottom piles 5 in two adjacent rows are arranged alternately to form a plum blossom shape to ensure the uniformity of the bearing capacity of the bottom piles 5.
[0045] Subsequently, the gravel cushion layer 1 is laid on the bottom piles 5, and the upper end of the bottom piles 5 should be ensured to be out of the silt foundation pit and kept flush. The upper end of the bottom piles 5 should extend into the gravel cushion layer 1 by 100-200 mm, so that the gravel cushion layer 1 fills the gap between adjacent bottom piles 5 to ensure the firmness of the bottom piles 5 and the firmness of the combination of the bottom piles 5 and the gravel cushion layer 1. After laying, the gravel cushion layer 1 should be compacted.
[0046] Finally, the first concrete base 2, the second concrete base 3 and the prefabricated foundation 4 are cast in the manner described in the first installation embodiment.
[0047] In summary, the greenhouse support foundation for the muddy foundation pit provided in this embodiment is achieved by driving bottom foundation piles into the muddy foundation pit, the bottom foundation piles are inserted into the ground in rows, and the two adjacent rows of bottom foundation piles are staggered, and a sand and gravel cushion layer is laid on the bottom foundation piles and compacted and leveled, and a first concrete base layer of C15 concrete and a second concrete base layer of C30 concrete are poured on the sand and gravel cushion layer, which ensures the bearing capacity of the bottom base layer and has the advantages of short construction period and low construction risk.
[0048] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0049] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A greenhouse support foundation for a muddy foundation pit, characterized in that: It comprises a plurality of bottom foundation piles (5), a sand and gravel cushion layer (1), a first concrete base layer (2) and a second concrete base layer (3); The lower ends of a plurality of the bottom foundation piles (5) are inserted into the ground in an arranged manner through the muddy foundation pit; The gravel cushion layer (1) is compacted above the bottom foundation piles (5); The first concrete base layer (2) is cast above the sand and gravel cushion layer (1), and the second concrete base layer (3) is cast above the first concrete base layer (2); A plurality of the bottom foundation piles (5) are inserted into the ground in rows, and the bottom foundation piles (5) in two adjacent rows are arranged in a staggered manner; The length of the bottom pile (5) is 3 to 5 meters, the diameter of the upper end surface of the bottom pile (5) is not less than 150 mm, and the distance between two adjacent bottom piles (5) is 300 to 600 mm; The bottom piles (5) are made of wood; A transverse steel mesh layer (301) is provided at the bottom of the second concrete base layer (3); A plurality of prefabricated foundation piers (4) are also cast above the second concrete base (3); A longitudinal support steel bar (302) is inserted into the second concrete base (3), the longitudinal support steel bar (302) extends out of the second concrete base (3), and the prefabricated pier (4) is cast on the longitudinal support steel bar (302); The prefabricated foundation pier (4) is made of C30 concrete.
2. The greenhouse support foundation for a muddy foundation pit according to claim 1, characterized in that: The thickness of the sand and gravel cushion layer (1) is 200 to 500 mm.
3. The greenhouse support foundation for a muddy foundation pit according to claim 2, characterized in that: The first concrete base (2) is a C15 concrete base, and the thickness of the first concrete base (2) is 80 to 120 mm.
4. The greenhouse support foundation for a muddy foundation pit according to claim 3, characterized in that: The second concrete base (3) is a C30 concrete base, and the thickness of the second concrete base (3) is 300-700 mm.
5. The greenhouse support foundation for a muddy foundation pit according to claim 2, characterized in that: The upper end of the bottom foundation pile (5) extends into the gravel cushion layer (1) by 100 to 200 mm.