Clustered small anchor pile column and construction method for adding basement under existing building

Abstract

The application discloses a bundled small anchor rod pile for adding a basement under an existing building and a construction method thereof. The method comprises the following steps: constructing a central small-diameter anchor rod pile and peripheral small-diameter anchor rod piles in the existing building and pouring slurry; during soil excavation under the existing building, a plurality of bundled rings are arranged layer by layer around the periphery of all the peripheral small-diameter anchor rod piles, the central small-diameter anchor rod pile and all the peripheral small-diameter anchor rod piles form a bundled small anchor rod pile, the bundled small anchor rod pile is used as a pile foundation for bearing the existing building and adding a basement structure; a floor of the added basement structure is constructed; and concrete is poured around the periphery of the bundled small anchor rod pile between adjacent floors of the added basement structure by a cast-in-place method to form a bundled small anchor rod pile column, the bundled small anchor rod pile column is used as a structural column of the added basement structure. The application can achieve the purpose of adding a basement structure in a narrow space and a low-clearance environment.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a clustered small anchor pile for adding a basement to an existing building and its construction method. Background Technology

[0002] To maximize land resource utilization, the rational and safe development of underground space beneath existing buildings, particularly through the construction of additional underground structures, is of paramount importance. As a crucial vertical support system in reverse construction methods, the single-pillar system presents significant challenges when adding underground structures to existing buildings, where the limited space prevents the entry of large machinery. Therefore, how to construct basement structures within confined, low-ceilinged existing buildings has become a pressing technical problem requiring solutions for those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a clustered small anchor pile for adding a basement to an existing building and its construction method, so as to solve the problem that it is impossible to add a basement structure to an existing building under narrow and low clearance conditions.

[0004] To address the aforementioned technical problems, this invention provides a clustered small anchor pile for adding a basement to an existing building and its construction method, comprising:

[0005] Within the existing building, construct small-diameter anchor piles at the center downwards according to the positioning;

[0006] Multiple evenly distributed peripheral small-diameter anchor piles are constructed downwards around the central small-diameter anchor pile.

[0007] Grouting material was injected into the central small-diameter anchor pile and the outer small-diameter anchor pile;

[0008] During the excavation of the soil under the existing building, multiple cluster rings are set layer by layer around all the outer small-diameter anchor piles to form a cluster of small anchor piles with the central small-diameter anchor pile and all the outer small-diameter anchor piles.

[0009] Clustered small anchor piles are used as supporting piles for existing buildings and as pile foundations for adding basement structures.

[0010] Construction includes the addition of floor slabs for the basement structure;

[0011] By using the sequential construction method, concrete is poured around the perimeter of the clustered small anchor piles between adjacent floor slabs of the added basement structure to form a clustered small anchor pile column.

[0012] Clustered small anchor piles are used as structural columns between the floor slabs of the added basement structure.

[0013] Furthermore, the present invention provides a clustered small anchor pile column for adding a basement to an existing building and its construction method, wherein a shear-resistant member is provided on the floor slab at the junction of the floor slab and the clustered small anchor pile.

[0014] Furthermore, the present invention provides a clustered small anchor pile column and its construction method for adding a basement under an existing building, wherein high-strength grout is injected into the central small-diameter anchor pile and the outer small-diameter anchor pile.

[0015] To address the aforementioned technical problems, the present invention also provides a clustered small anchor pile for adding a basement to an existing building, comprising:

[0016] Small-diameter anchor piles at the center;

[0017] The outer small-diameter anchor piles consist of multiple piles arranged around the outer perimeter of the central small-diameter anchor pile. The central small-diameter anchor pile and all the outer small-diameter anchor piles are filled with grout.

[0018] A cluster ring, consisting of multiple rings, is fixedly installed around all the peripheral small-diameter anchor piles, forming a cluster of small anchor piles with the central small-diameter anchor pile and all the peripheral small-diameter anchor piles. These clustered small anchor piles serve as support piles for existing buildings and as foundation piles for the addition of basement structures. Concrete is poured around the clustered small anchor piles between adjacent floor slabs of the added basement structure to form clustered small anchor pile columns, which serve as structural columns between the floor slabs of the added basement structure.

[0019] Furthermore, the clustered small anchor piles for adding basements to existing buildings provided by the present invention are made of small-diameter steel pipes, both the central small-diameter anchor pile and the outer small-diameter anchor piles, and the ends of the small-diameter steel pipes are pointed.

[0020] Furthermore, the present invention provides a clustered small anchor pile for adding a basement to an existing building, wherein the clustering ring is a steel sleeve hoop.

[0021] Furthermore, the present invention provides a clustered small anchor pile for adding a basement to an existing building, wherein the clustering ring is made of steel wire.

[0022] Furthermore, the bundled small anchor piles for adding basements to existing buildings provided by this invention use a binding strap.

[0023] The present invention provides a clustered small anchor pile and its construction method for adding basements to existing buildings. In construction environments where large machinery cannot access existing buildings due to limited space and low clearance, conventional one-pillar-one-pile construction methods are not feasible, the present invention utilizes clustered small anchor piles as both the supporting piles for the existing building and the foundation for the added basement structure. This achieves the goal of adding basement structures to existing buildings under conditions where large machinery cannot access them due to limited space and low clearance.

[0024] This invention provides a clustered small anchor pile system for adding basements to existing buildings and its construction method. The central and peripheral small-diameter anchor piles in the clustered small anchor pile system are smaller than the diameter of conventional anchor piles. The lower single-pile pressure and reaction force of the central and peripheral small-diameter anchor piles allow for pile driving using small press-fitting machines within existing buildings. By constructing the central small-diameter anchor pile first, the pile positioning and verticality control are improved, enhancing the quality of the pile formation. The peripheral small-diameter anchor piles are then constructed, and a clustering ring is used to fix them, forming a clustered small anchor pile system. This creates an integral structure, increasing the bearing capacity of the clustered small anchor piles as support piles for existing buildings and as the foundation for adding basements. Grouting within the central and peripheral small-diameter anchor piles further enhances the compressive bearing capacity of the clustered small anchor pile system.

[0025] This invention provides a clustered small anchor pile column and its construction method for adding basements to existing buildings. The clustered small anchor pile column is formed by pouring concrete around the clustered small anchor piles between adjacent floor slabs of the added basement structure using a sequential construction method. This clustered small anchor pile replaces the column reinforcement cage, eliminating the need for separately binding column reinforcement cages and pouring concrete to construct the structural columns between floor slabs. It also eliminates the need to cut and remove the clustered small anchor piles after forming the structural columns, thereby reducing costs, simplifying the construction process, and improving the construction efficiency of adding basement structures. The structural column, as a vertical support component of the added basement structure, ensures the safety of the added basement structure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the planar structure of a clustered small anchor pile;

[0027] Figure 2 This is a schematic diagram of the elevation structure of the central small-diameter anchor pile;

[0028] Figure 3 This is a schematic diagram of the elevation structure for the addition of a basement.

[0029] As shown in the figure:

[0030] 100. Existing buildings;

[0031] 200. Clustered small anchor piles; 210. Central small-diameter anchor piles; 211. Small-diameter steel pipes; 212. Grout; 220. Peripheral small-diameter anchor piles; 230. Cluster rings.

[0032] 300. Shear-resistant components;

[0033] 400, floor slab;

[0034] 500. Structural column. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0036] Please refer to Figures 1 to 3 This invention provides a clustered small anchor pile for adding a basement to an existing building and its construction method, which may include the following steps:

[0037] Step 601: Construct a small-diameter central anchor pile 210 downwards within the existing building 100 according to the positioning. Construction can be carried out on the foundation slab of the existing building 100.

[0038] Step 602: Construct multiple evenly distributed peripheral small-diameter anchor piles 220 downwards around the central small-diameter anchor pile 210. The peripheral small-diameter anchor piles 220 and the central small-diameter anchor pile 210 have the same diameter; small-diameter anchor piles refer to those with a diameter smaller than that of conventional anchor piles.

[0039] Step 603: Grout 212 is injected into the central small-diameter anchor pile 210 and the outer small-diameter anchor piles 220. To improve compressive strength, high-strength grout can be injected into the central small-diameter anchor pile 210 and the outer small-diameter anchor piles 220. Both the central small-diameter anchor pile 210 and the outer small-diameter anchor piles 220 are made of small-diameter steel pipes 211, and the ends of the small-diameter steel pipes are pointed to facilitate pile driving.

[0040] Step 604: During the excavation of the soil below the existing building 100, multiple cluster rings 230 are set layer by layer around all the outer small diameter anchor piles 220 to form a clustered small anchor pile 200 with the central small diameter anchor pile 210 and all the outer small diameter anchor piles 220.

[0041] Step 605: Use the clustered small anchor piles 200 as the supporting piles for the existing building 100 and the pile foundation for the added basement structure.

[0042] Step 606: Construct the floor slab 400 of the basement structure. The floor slab 400 is determined by the number of floors in the basement structure. Taking a two-story basement structure as an example, the floor slab includes slabs B0, B1, and B2. The construction of floor slab 400 is carried out using the reverse construction method.

[0043] Step 607: Concrete is poured around the clustered small anchor piles 200 between the adjacent floor slabs 400 of the added basement structure to form a clustered small anchor pile column by means of sequential construction.

[0044] Step 608: Use the clustered small anchor piles as structural columns 500 between the floor slabs of each additional basement structure.

[0045] Please refer to Figure 3 In order to improve the shear resistance of the clustered small anchor piles 200 at the floor slab, the construction method of the clustered small anchor piles for adding a basement under an existing building provided in this embodiment of the invention includes a shear-resistant member 300 on the floor slab 400 at the junction of the floor slab 400 and the clustered small anchor piles 200. The shear-resistant member 300 can enhance the bearing capacity of the floor slab 400 and the clustered small anchor piles 200 at the floor slab.

[0046] Please refer to Figures 1 to 2 This invention also provides a clustered small anchor pile for adding a basement to an existing building, which may include a central small-diameter anchor pile 210, peripheral small-diameter anchor piles 220, and a cluster ring 230, wherein:

[0047] The central small-diameter anchor pile 210 has a smaller diameter than that of a conventional anchor pile.

[0048] Multiple small-diameter anchor piles 220 are arranged around the periphery of the central small-diameter anchor pile 210. Grout 212 is injected into the central small-diameter anchor pile 210 and all the peripheral small-diameter anchor piles 220.

[0049] Multiple cluster rings 230 are fixedly installed around all the peripheral small-diameter anchor piles 220, forming a cluster of small anchor piles 200 with the central small-diameter anchor pile 210 and all the peripheral small-diameter anchor piles 220. These clustered small anchor piles 200 serve as support piles for the existing building and as foundation piles for the added basement structure. Concrete is poured around the clustered small anchor piles 200 between adjacent floor slabs 400 of the added basement structure to form clustered small anchor pile columns. These clustered small anchor pile columns serve as structural columns 500 between the floor slabs of the added basement structure. The cluster rings 230 can be steel collars, steel wires, straps, etc.

[0050] Please refer to Figure 3 The present invention provides a method for constructing a basement beneath an existing building using clustered small anchor piles. This method addresses situations where the existing building 100 has limited space and low clearance, making it impossible for large machinery to access the structure. In such environments, conventional one-pillar-one-pile construction methods are not feasible. By using clustered small anchor piles 200 as both the supporting piles for the existing building 100 and the foundation for the basement structure, the method achieves the goal of constructing a basement beneath the existing building 100 under these challenging conditions.

[0051] Please refer to Figures 1 to 3 The present invention provides a clustered small anchor pile column and its construction method for adding a basement to an existing building. The central small-diameter anchor pile 210 and the outer small-diameter anchor pile 220 in the clustered small anchor pile 200 are both smaller than the diameter of conventional anchor piles. Because the single pile pressure and reaction force of the central small-diameter anchor pile 210 and the outer small-diameter anchor pile 220 are small, a small press-fitting machine can be used for pile driving within the existing building 100. By constructing the central small-diameter anchor pile 210 first, the pile positioning and verticality control are improved, thus enhancing the quality of the pile formation. The outer small-diameter anchor piles 220 are then constructed, and the outer small-diameter anchor piles 220 are fixed by a clustering ring 230 to form the clustered small anchor pile 200. This makes the clustered small anchor pile 200 an integral structure, improving the bearing capacity of the clustered small anchor pile 200 as a support pile for the existing building 100 and the pile foundation for the added basement structure. The compressive bearing capacity of the clustered small anchor piles 200 is further enhanced by grouting inside the central small-diameter anchor pile 210 and the outer small-diameter anchor piles 220.

[0052] Please refer to Figure 3 This invention provides a construction method for adding a basement to an existing building using clustered small anchor piles. The method involves pouring concrete around the clustered small anchor piles 200 between adjacent floor slabs 400 of the basement structure using a sequential construction method. These clustered small anchor piles serve as structural columns 500 between the floor slabs of the basement structure, replacing the need for separate column reinforcement cages. This eliminates the need for separately binding column reinforcement cages during concrete pouring for the structural columns 500 between floor slabs 400, and also eliminates the need to cut and remove the clustered small anchor piles 200 after forming the structural columns 500. This reduces costs, simplifies the construction process, and improves the construction efficiency of adding a basement structure. The structural columns 500, as vertical support components of the basement structure, ensure the safety of the added basement structure.

[0053] This invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only a part of the embodiments of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this invention are within the scope of protection of this invention. Those skilled in the art can make other modifications and variations to this invention. Therefore, if these modifications and variations of this invention fall within the scope of the claims of this invention, then this invention also intends to include these modifications and variations.

Claims

1. A construction method for clustered small anchor piles for adding a basement to an existing building, characterized in that, include: Within the existing building, construct small-diameter anchor piles at the center downwards according to the positioning; Multiple evenly distributed peripheral small-diameter anchor piles are constructed downwards around the central small-diameter anchor pile. Grouting material was injected into the central small-diameter anchor pile and the outer small-diameter anchor pile; During the excavation of the soil under the existing building, multiple cluster rings are set layer by layer around all the outer small-diameter anchor piles to form a cluster of small anchor piles with the central small-diameter anchor pile and all the outer small-diameter anchor piles. Clustered small anchor piles are used as supporting piles for existing buildings and as pile foundations for adding basement structures. Construction includes the addition of floor slabs for the basement structure; By using the sequential construction method, concrete is poured around the perimeter of the clustered small anchor piles between adjacent floor slabs of the added basement structure to form a clustered small anchor pile column. Clustered small anchor piles are used as structural columns between the floor slabs of the added basement structure.

2. The construction method of clustered small anchor piles for adding a basement under an existing building according to claim 1, characterized in that, Shear-resistant components are installed on the floor slab at the junction of the floor slab and the clustered small anchor piles.

3. The construction method of clustered small anchor piles for adding basements to existing buildings according to claim 1, characterized in that, High-strength grout was injected into the central small-diameter anchor pile and the outer small-diameter anchor pile.

4. The construction method of clustered small anchor piles for adding a basement under an existing building according to claim 1, characterized in that, Both the central small-diameter anchor pile and the peripheral small-diameter anchor pile are made of small-diameter steel pipes, and the ends of the small-diameter steel pipes are pointed.

5. The construction method of clustered small anchor piles for adding a basement under an existing building according to claim 1, characterized in that, The clustering ring is a steel sleeve hoop.

6. The construction method of clustered small anchor piles for adding a basement under an existing building according to claim 1, characterized in that, The bundle ring is made of steel wire.

7. The construction method of clustered small anchor piles for adding a basement under an existing building according to claim 1, characterized in that, The bundle ring is a strap.

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