Expanded foundation structure close to building

Abstract

The enlarged foundation structure close to the building comprises a broken stone hardcore, a bagged dry-mixed material layer, an enlarged foundation and a wall body which are sequentially arranged from bottom to top and close to the building. The structure is characterized in that the broken stone hardcore and the bagged dry-mixed mixture layer are located below the underground water level line, and the expanded foundation and the wall body are located above the underground water level line; pre-buried galvanized steel pipes are distributed in the bagged dry-mixed material layer, a grouting pipe communicated with the pre-buried galvanized steel pipes is pre-buried in one side of the expanded foundation, a grout outlet pipe is pre-buried in the other side of the expanded foundation, and grout outlet holes are evenly formed in the pre-buried galvanized steel pipes. According to the enlarged foundation structure close to the building, due to the fact that the dry-mixed mixture is composed of the cement, the sand and the gravel which are solidified when encountering water, the gravel hardcore layer and the bagged dry-mixed mixture layer can be constructed in the state that water exists, a foundation pit does not need to be subjected to precipitation treatment, and therefore the safety of the close building is guaranteed.

Description

Technical Field

[0001] This utility model relates to an enlarged foundation structure, and more specifically, to an enlarged foundation structure close to a building. Background Technology

[0002] With the rapid development of my country's economy, the road network is becoming increasingly dense, and correspondingly, more and more bridges are being built in cities. The foundations of urban bridges are generally pile foundations or spread foundations. Pile foundations need to be inserted into the ground at a relatively deep location during construction, which often leads to limitations due to underground pipelines, subways, and other urban infrastructure. Meanwhile, existing spread foundations require the treatment of dewatering below the groundwater level during construction.

[0003] Urban bridges are often located close to buildings, and their spread foundations are frequently laid below the groundwater level. During the dewatering process of the spread foundation pit, settlement of nearby buildings can occur, posing safety hazards to urban structures and residents. Therefore, this invention provides a spread foundation structure close to buildings that eliminates the need for dewatering the spread foundation pit during construction, thus ensuring the safety of adjacent buildings. Summary of the Invention

[0004] In order to overcome the shortcomings of the above-mentioned technical problems, this utility model provides an enlarged foundation structure close to the building.

[0005] This utility model discloses an enlarged foundation structure near a building, comprising, from bottom to top, a crushed stone cushion layer, a bagged dry-mixed material layer, an enlarged foundation, and a wall body, located adjacent to the building; characterized in that: the crushed stone cushion layer and the bagged dry-mixed material layer are located below the groundwater level, while the enlarged foundation and the wall body are located above the groundwater level; galvanized steel pipes are embedded in the bagged dry-mixed material layer, a grouting pipe communicating with the embedded galvanized steel pipe is embedded on one side of the enlarged foundation, and a grout outlet pipe communicating with the upper part of the bagged dry-mixed material layer is embedded on the other side of the enlarged foundation, wherein grout outlet holes are uniformly opened on the embedded galvanized steel pipe.

[0006] The present invention relates to an enlarged foundation structure near a building, wherein the bagged dry-mixed material layer is composed of nylon bags filled with dry-mixed material arranged in layers, with the nylon bags in adjacent upper and lower layers staggered, and a tin-plated steel pipe is embedded below every two layers of nylon bags; the dry-mixed material is a mixture of cement, sand and gravel that solidifies upon contact with water.

[0007] The extended foundation structure of this utility model, which is close to the building, has a structure in which the length and width of the crushed stone cushion layer, the bagged dry-mixed material layer, the extended foundation and the wall body decrease in succession, and the left and right sides and the front and back sides of the extended contact are all 1m outward from the bottom of the wall body.

[0008] The enlarged foundation structure near the building of this utility model has a crushed stone cushion layer with a thickness of 0.5m to 1.0m and a bagged dry-mixed material layer with a thickness of 1.5m to 5.0m.

[0009] The present invention relates to an enlarged foundation structure near a building, wherein the enlarged foundation is a concrete foundation, and the enlarged foundation is poured after the bagged dry-mixed material layer is constructed.

[0010] The present invention relates to an enlarged foundation structure close to a building. After the enlarged foundation is poured and its strength reaches 80%, cement grouting is performed on the bagged dry-mixed material layer through grouting pipes and pre-embedded galvanized steel pipes.

[0011] The present invention relates to an enlarged foundation structure close to a building, wherein the wall is a masonry wall or a reinforced concrete wall.

[0012] The beneficial effects of this utility model are as follows: The enlarged foundation structure of this utility model, located near a building, consists of a crushed stone cushion layer, a bagged dry-mixed material layer, an enlarged foundation, and a wall, arranged sequentially from bottom to top of the adjacent building. The crushed stone cushion layer and the bagged dry-mixed material layer are located below the groundwater level, while the enlarged foundation and the wall are located above the groundwater level. The bagged dry-mixed material layer is composed of nylon bags filled with dry-mixed material, which are arranged in a staggered order by manual labor and a crane. After the enlarged foundation is poured, it is grouted through a grouting pipe. Since the dry-mixed material is composed of cement, sand, and crushed stone that solidifies when exposed to water, both the crushed stone cushion layer and the bagged dry-mixed material layer can be constructed in a water-rich environment, eliminating the need for dewatering treatment of the foundation pit and thus ensuring the safety of the adjacent building. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the enlarged foundation structure close to the building according to this utility model.

[0014] In the diagram: 1. Crushed stone cushion layer, 2. Bagged dry-mixed material layer, 3. Expanded foundation, 4. Wall body, 5. Embedded galvanized steel pipe, 6. Grouting pipe, 7. Grout outlet pipe, 8. Groundwater level, 9. Building, 10. Grout outlet hole, 11. Nylon bag, 12. Dry-mixed material, 13. T-joint. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] like Figure 1The diagram shows a schematic representation of the enlarged foundation structure near a building according to this invention. It consists of a crushed stone cushion layer 1, a bagged dry-mixed material layer 2, an enlarged foundation 3, and a wall 4, all positioned near the building 9. These components are arranged sequentially from bottom to top. The crushed stone cushion layer 1 and the bagged dry-mixed material layer 2 are located below the groundwater level 8, while the enlarged foundation 3 and the wall 4 are located above the groundwater level 8. The crushed stone cushion layer 1 is placed at the bottom, the bagged dry-mixed material layer 2 is placed above it, the enlarged foundation 3 is poured on top of the bagged dry-mixed material layer 2, and the wall 4 is placed on top of the enlarged foundation 3.

[0017] The bagged dry-mixed material layer 2 is composed of multiple layers of nylon bags 11 filled with dry-mixed material 12, arranged in a staggered pattern. Each layer of nylon bags 11 has an equal thickness. The dry-mixed material 12 is a mixture of cement, sand, and gravel that hardens upon contact with water. This allows the bagged dry-mixed material layer 2 to be constructed even when groundwater seeps into the foundation pit. Furthermore, because the gravel cushion layer 1 is water-resistant, both the gravel cushion layer 1 and the bagged dry-mixed material layer 2, which are below the groundwater level, can be constructed with water. Thus, there is no need for dewatering the foundation pit, preventing ground settlement of adjacent buildings and ensuring the safety of nearby structures.

[0018] The bagged dry-mixed material layer 2 shown has a pre-embedded galvanized steel pipe 5. The upper and lower layers of nylon bags 11 containing dry-mixed material 12 are arranged in a staggered pattern, and a pre-embedded galvanized steel pipe 5 is installed below each side of the nylon bags 11. A vertical grouting pipe 6 is pre-embedded on one side of the enlarged foundation 3, and a vertical grout outlet pipe 7 is pre-embedded on the other side of the enlarged foundation 3. The lower end of the grouting pipe 6 is connected to the pre-embedded galvanized steel pipe 5. When there are two or more layers of pre-embedded galvanized steel pipes 5, the lower end of the grouting pipe 6 is connected to the pre-embedded galvanized steel pipe 5 via a tee joint 13. Grout outlet holes 10 are evenly opened on the pre-embedded galvanized steel pipe 5, and the distance between adjacent grouting holes 10 can be set to 1m.

[0019] In this way, after the enlarged foundation 3 is poured and reaches 80% of its strength, cement grout can be injected into the bagged dry-mixed material layer 2 through the grouting pipe 6. The cement grout flows out through the grout outlet 10 on the pre-embedded galvanized steel pipe 5, which can fill the gaps between the nylon bags 11 to form a structurally stable bagged dry-mixed material layer 2, so as to ensure its firm support for the enlarged foundation 3 and the wall 4 above.

[0020] The crushed stone cushion layer 1, the bagged dry-mixed material layer 2, the enlarged foundation 3, and the wall 4 shown below decrease in length and width in succession, forming a pyramid shape to ensure the stability of the foundation. The thickness of the crushed stone cushion layer 1 is 0.5m~1.0m, the thickness of the bagged dry-mixed material layer 2 is 1.5m~5.0m, and the left and right sides and the front and back sides of the enlarged foundation are all 1m wider than the bottom of the wall.

[0021] The enlarged foundation 3 is a concrete foundation, which is poured after the bagged dry-mixed material layer 2 is completed. After the enlarged foundation 3 is poured and its strength reaches 80%, cement grouting is performed on the bagged dry-mixed material layer 2 through the grouting pipe 6 and the pre-embedded galvanized steel pipe 5; the wall is a masonry wall or a reinforced concrete wall.

[0022] During the construction of the enlarged foundation structure near the building according to this utility model, the foundation pit of the adjacent building 9 is excavated first. After the foundation pit is excavated, a crushed stone cushion layer 1 is laid first. After the crushed stone cushion layer 1 is laid, the bagged dry-mixed material layer 2 is laid. When laying the bagged dry-mixed material layer 2, a pre-embedded galvanized steel pipe 5 is first laid on the crushed stone cushion layer 1, and the pre-embedded galvanized steel plate 5 is connected to the grouting pipe 6. If the number of nylon bags 11 exceeds two layers, a layer of pre-embedded galvanized steel pipe 5 is laid under every two layers. After the bagged dry-mixed material layer 2 is laid, the grout outlet pipe 7 is inserted on the side away from the grouting pipe 6.

[0023] Then, an enlarged foundation 3 is poured on the bagged dry-mixed material layer 2. After the enlarged foundation 3 reaches 80% strength, cement grouting is performed on the bagged dry-mixed material layer 2 through the grouting pipe 6 and the pre-embedded galvanized steel pipe 5 to form a stable bagged dry-mixed material layer 2. After the bagged dry-mixed material layer 2 and the enlarged foundation 3 have completely solidified, the wall 4 is finally poured or the wall is built.

Claims

1. A enlarged foundation structure close to a building, comprising, from bottom to top, a crushed stone cushion layer (1), a dry-mixed material bag layer (2), an enlarged foundation (3) and a wall body (4) arranged in sequence adjacent to the building (9); characterized in that: The gravel cushion layer and the dry-mixed bagged mixture layer are located below the groundwater level line (8), and the enlarged foundation and the wall body are located above the groundwater level line; the dry-mixed bagged mixture layer is provided with a galvanized steel pipe (5) embedded therein, one side of the enlarged foundation is provided with a grouting pipe (6) communicated with the galvanized steel pipe, and the other side of the enlarged foundation is provided with a grout outlet pipe (7) communicated with the upper part of the dry-mixed bagged mixture layer, and the galvanized steel pipe is uniformly provided with grout outlet holes (10).

2. An enlarged foundation structure proximate a building according to claim 1, wherein: The dry-mixed bagged mixture layer (2) is formed by placing nylon bags (11) filled with dry-mixed mixture (12) in layers, and the nylon bags in adjacent upper and lower layers are arranged in staggered seams, and the galvanized steel pipe is embedded below every two layers of nylon bags; the dry-mixed mixture is a mixture of cement, sand and gravel which solidifies when water is added.

3. An enlarged foundation structure adjacent a building according to claim 1 or 2, characterised in that: The lengths and widths of the gravel cushion layer (1), the dry-mixed bagged mixture layer (2), the enlarged foundation (3) and the wall body (4) are gradually reduced, and the left and right sides and the front and back sides of the enlarged foundation are each extended outward by 1m than the bottom of the wall body.

4. An enlarged foundation structure adjacent a building according to claim 1 or 2, characterised in that: The thickness of the gravel cushion layer (1) is 0.5m-1.0m, and the thickness of the dry-mixed bagged mixture layer (2) is 1.5m-5.0m.

5. An enlarged foundation structure adjacent a building according to claim 1 or 2, characterised in that: The enlarged foundation (3) is a concrete foundation, and the enlarged foundation is poured after the dry-mixed bagged mixture layer (2) is constructed.

6. An enlarged foundation structure adjacent a building according to claim 1 or 2, characterised in that: After the enlarged foundation (3) is poured, the dry-mixed bagged mixture layer (2) is subjected to cement grouting through the grouting pipe (6) and the galvanized steel pipe (5) embedded therein when the strength of the enlarged foundation reaches 80%.

7. An enlarged foundation structure adjacent a building according to claim 1 or 2, characterised in that: The wall body (4) is a stone wall body or a reinforced concrete wall body.

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