A pile conversion structure for a building built first and an underground structure built later

Abstract

The utility model relates to a pile column conversion structure for first building building and later building underground structure, include: pile foundation, including lower cast -in -place pile and fixed connection in cast -in -place pile top's steel pipe pile, first building building, support in steel pipe pile's top, later building underground structure, be located first building building's below, and support in cast -in -place pile's top, and steel pipe pile's pile body passes through later building underground structure, the utility model discloses under the premise that not influence underground structure implementation, the building on the ground can build first, synchronously reserve implementation condition for later building underground structure, under the premise that disturbing first building building's structure as far as possible, later building underground structure can effectively utilize first building building's foundation cast -in -place pile, belong to the building construction technical field.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a pile-column conversion structure for buildings constructed first and underground structures constructed later. Background Technology

[0002] After years of development, urban planning and construction have become increasingly sophisticated, while the space for further development and construction within megacities is shrinking. To improve urban transportation and public infrastructure, land use in cities is becoming more intensive, leading to the emergence of large-scale complexes that combine public buildings and transportation facilities. During the construction of these large-scale complexes, inconsistencies in project implementation schedules often result in earlier projects failing to adequately consider or reserve sufficient conditions for later projects, making later projects either impossible to implement or significantly increasing the difficulty of implementation.

[0003] Therefore, a new construction technique is urgently needed that fully considers the subsequent underground structures when constructing the above-ground buildings first, creating conditions for the smooth implementation of the underground structures. This technique ensures that the underground structures do not interfere with the above-ground buildings and that the underground structures can make full use of the foundation piles of the above-ground buildings. This not only achieves the goal of ensuring that the projects constructed sequentially do not interfere with each other but also reduces the investment in the project. Utility Model Content

[0004] In view of the technical problems existing in the prior art, the purpose of this utility model is to provide a pile-column conversion structure for the construction of buildings first and underground structures later, so as to create conditions for the smooth implementation of the construction of underground structures later.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pile-column conversion structure for a pre-constructed building and a subsequent underground structure includes: a pile foundation, comprising a lower cast-in-place pile and a steel pipe pile fixedly connected to the top of the cast-in-place pile; a pre-constructed building supported on the top of the steel pipe pile; and a subsequent underground structure located below the pre-constructed building and supported on the top of the cast-in-place pile, wherein the pile body of the steel pipe pile passes through the subsequent underground structure.

[0006] As a preferred embodiment, the bottom of the steel pipe of the steel pipe pile is inserted into the cast-in-place pile and welded to the reinforcing cage of the cast-in-place pile; the bottom of the reinforcing cage skeleton at the top of the steel pipe pile is inserted into the steel pipe of the steel pipe pile and welded to the reinforcing bars inside the steel pipe pile; the upper part of the reinforcing cage skeleton at the top of the steel pipe pile is anchored into the pre-constructed building; underwater concrete is poured into the steel pipe pile and the cast-in-place pile as a whole to form an underwater concrete layer, with the pouring height reaching the top of the steel pipe of the steel pipe pile.

[0007] As a preferred embodiment, the bottom of the steel pipe of the steel pipe pile is inserted into the cast-in-place pile with an insertion length of 2.5~3.5m; the bottom of the steel reinforcement cage at the top of the steel pipe pile is inserted into the steel pipe of the steel pipe pile with an insertion length of not less than 1.5m.

[0008] As a preferred option, the steel pipe pile top reinforcement cage includes vertical reinforcement and horizontal reinforcement; the vertical reinforcement uses HRB400E grade steel bars with a diameter of not less than 25mm and a horizontal spacing of not more than 100mm; the horizontal reinforcement uses HRB400E grade steel bars with a diameter of 12~14mm and a vertical spacing of 100~150mm; the underwater concrete is concrete with a strength grade of not less than C35.

[0009] As a preferred option, the pre-constructed building includes a steel pipe pile top cap, a bottom slab beam, pre-constructed building columns, and a main structure; the steel pipe pile top cap is set on top of the steel pipe piles, and the steel pipe piles pass through the steel pipe pile top cap, the bottom slab beam is supported on the steel pipe pile top cap, and the pre-constructed building columns are set on the bottom slab beam.

[0010] As a preferred option, the constructed underground structure includes an underground structure foundation, an underground structure base slab, and a main structure connected as a whole; the underground structure foundation is located at the bottom of the steel pipe piles and supported on the cast-in-place piles, the underground structure base slab is supported on the underground structure foundation, and the steel pipe piles pass through the underground structure foundation and the underground structure base slab.

[0011] As a preferred embodiment, a ring of external vertical reinforcing bars is provided on the upper outer side of the steel pipe pile, with the external vertical reinforcing bars located inside the top cap of the steel pipe pile and extending from the bottom of the top cap of the steel pipe pile at their lower ends; a ring of external vertical reinforcing bars and external horizontal reinforcing bars are provided on the middle outer side of the steel pipe pile, positioned above the cast-in-place pile and below the top cap of the steel pipe pile; the external vertical reinforcing bars on the upper outer side of the steel pipe pile correspond one-to-one with the external vertical reinforcing bars on the middle outer side of the steel pipe pile, and are connected by welding, thereby forming a reinforcing steel skeleton with the external vertical reinforcing bars and external horizontal reinforcing bars.

[0012] As a preferred option, the outer vertical reinforcement bars are made of HRB400E grade steel bars with a diameter of not less than 25mm and a horizontal spacing of not more than 100mm.

[0013] As a preferred option, the outer horizontal reinforcement uses HRB400E grade steel bars with a diameter of 12~14mm and a vertical spacing of 100~150mm.

[0014] As a preferred option, concrete with a strength grade of not less than C40 is poured outside the steel reinforcement cage to form a concrete layer.

[0015] The principle of this invention is as follows: To create favorable conditions for the construction of subsequent underground structures by building the existing structure first, the subsequent underground structures can effectively utilize the foundation piles of the existing structure while minimizing disturbance to its structure. A steel pipe pile scheme is used from the top of the foundation piles of the existing structure to the bottom of the foundation beams of the subsequent underground structure. During the construction of the subsequent underground structure, the foundation piles of the existing structure are used as the foundation, and the steel pipe piles are reinforced with external reinforced concrete.

[0016] This utility model has the following advantages: 1. Improves construction efficiency, enhances safety, improves practicality, and reduces construction costs.

[0017] 2. Throughout the construction process, the impact of the subsequently constructed underground structures on the structure and construction sequence of the preceding buildings can be minimized, significantly shortening the construction cycle of the preceding buildings and allowing them to be completed and put into use sooner, thus improving the efficiency of construction fund utilization. The subsequently constructed underground structures do not disturb the structure of the preceding buildings, ensuring high safety. The entire implementation process is simple and highly practical. The subsequently constructed underground structures can effectively utilize the foundation piles of the preceding buildings, greatly reducing construction costs.

[0018] 3. For the area from the top of the foundation piles of the first-built building to the bottom of the foundation beams of the subsequent underground structure, steel pipe piles shall be used. This is because the diameter of the steel pipe piles is much smaller than that of the pile foundation, which greatly reduces the probability of the foundation piles of the first-built building encroaching on the structural limits of the subsequent underground structure, thus creating favorable conditions for the design and construction of the subsequent underground structure.

[0019] 4. The reinforced concrete encasing the steel pipe pile shall be made of concrete with a strength grade of not less than C40 to ensure the quality of reinforcement and strengthening of the concrete encasing the steel pipe pile.

[0020] 5. The steel bars are HRB400E grade, and the concrete is C40 grade. Both are common building materials, widely used in the market, and have low raw material costs. Attached Figure Description

[0021] Figure 1 It is a frontal cross-sectional view of steel pipe piles and cast-in-place piles.

[0022] Figure 2 It is a structural cross-sectional view of steel pipe piles, cast-in-place piles, and above-ground structures.

[0023] Figure 3 It is a structural cross-sectional view of steel pipe piles, cast-in-place piles, above-ground buildings, and underground structures.

[0024] Figure 4It is a structural cross-section of steel pipe piles as reinforced concrete columns, cast-in-place piles, above-ground buildings, and underground structures.

[0025] Figure 5 This is a horizontal cross-sectional view of a reinforced concrete column.

[0026] 1 is a steel pipe pile, 2 is a cast-in-place pile, 3 is the vertical reinforcement of the cast-in-place pile reinforcement cage, 4 is the horizontal spiral reinforcement of the cast-in-place pile reinforcement cage, 5 is the vertical reinforcement of the steel pipe pile top reinforcement cage skeleton, 6 is the horizontal reinforcement of the steel pipe pile top reinforcement cage skeleton, 7 is the underwater concrete of the cast-in-place pile, 8 is the underwater concrete of the steel pipe pile, 9 is the upper outer vertical reinforcement of the pre-embedded steel pipe pile, 10 is the top cap of the steel pipe pile of the pre-constructed building, 11 is the bottom slab beam of the pre-constructed building, 12 is the column of the pre-constructed building, 13 is the cap of the underground structure, 14 is the outer vertical reinforcement of the middle part of the steel pipe pile, 15 is the outer horizontal reinforcement, 16 is the bottom slab of the underground structure, and 17 is the concrete layer. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to specific embodiments.

[0028] The application scenario of this utility model is as follows: The original plan was to construct the above-ground building and the underground structure simultaneously, following the principle of underground construction first, followed by above-ground construction. The main structure of the underground structure was to be completed before the structure of the above-ground building was constructed. However, due to the need for the above-ground building to be put into use ahead of schedule, the construction sequence was adjusted, with the main structure of the above-ground building being constructed first. After the above-ground building was completed and put into use, the underground structure was constructed later, entering the basement of the above-ground building. Without disturbing the structure of the first-built building, the later-constructed underground structure can fully utilize the foundation piles of the first-built building. Therefore, a steel pipe pile scheme is adopted from the top of the foundation piles of the first-built building to the bottom of the foundation beams of the later-constructed underground structure.

[0029] A pile-column conversion structure for a pre-constructed building and a subsequent underground structure includes: a pile foundation, comprising a lower cast-in-place pile and a steel pipe pile fixedly connected to the top of the cast-in-place pile; a pre-constructed building supported on the top of the steel pipe pile; and a subsequent underground structure located below the pre-constructed building and supported on the top of the cast-in-place pile, wherein the pile body of the steel pipe pile passes through the subsequent underground structure.

[0030] The bottom of the steel pipe of the steel pipe pile is inserted into the cast-in-place pile and welded to the reinforcing cage of the cast-in-place pile; the bottom of the reinforcing cage skeleton at the top of the steel pipe pile is inserted into the steel pipe of the steel pipe pile and welded to the reinforcing bars inside the steel pipe pile; the upper part of the reinforcing cage skeleton at the top of the steel pipe pile is anchored into the pre-constructed building; underwater concrete is poured into the steel pipe pile and the cast-in-place pile as a whole to form an underwater concrete layer, with the pouring height reaching the top of the steel pipe of the steel pipe pile.

[0031] The bottom of the steel pipe of the steel pipe pile is inserted into the cast-in-place pile with an insertion length of 2.5~3.5m; the bottom of the steel reinforcement cage at the top of the steel pipe pile is inserted into the steel pipe of the steel pipe pile with an insertion length of not less than 1.5m.

[0032] The steel pipe pile top reinforcement cage includes vertical reinforcement and horizontal reinforcement; the vertical reinforcement uses HRB400E grade steel bars with a diameter of not less than 25mm and a horizontal spacing of not more than 100mm; the horizontal reinforcement uses HRB400E grade steel bars with a diameter of 12~14mm and a vertical spacing of 100~150mm; the underwater concrete is concrete with a strength grade of not less than C35.

[0033] The pre-constructed building includes a steel pipe pile top cap, a bottom slab beam, pre-constructed building columns, and the main structure. The steel pipe pile top cap is set on top of the steel pipe piles, and the steel pipe piles pass through the steel pipe pile top cap. The bottom slab beam is supported on the steel pipe pile top cap, and the pre-constructed building columns are set on the bottom slab beam.

[0034] The underground structures constructed later include an underground structure foundation, an underground structure base slab, and a main structure that are connected as a whole. The underground structure foundation is located at the bottom of the steel pipe piles and supported on the cast-in-place piles. The underground structure base slab is supported on the underground structure foundation, and the steel pipe piles pass through the underground structure foundation and the underground structure base slab.

[0035] A ring of external vertical reinforcing bars is installed on the upper outer side of the steel pipe pile. The external vertical reinforcing bars are located inside the top cap of the steel pipe pile, with their lower ends extending from the bottom of the top cap. A ring of external vertical reinforcing bars and external horizontal reinforcing bars are installed on the middle outer side of the steel pipe pile, above the cast-in-place pile and below the top cap of the steel pipe pile. The external vertical reinforcing bars on the upper outer side of the steel pipe pile correspond one-to-one with the external vertical reinforcing bars on the middle outer side of the steel pipe pile, and are connected by welding, so that the external vertical reinforcing bars and external horizontal reinforcing bars form a reinforcing steel skeleton.

[0036] The outer vertical reinforcement uses HRB400E grade steel bars with a diameter of not less than 25mm and a horizontal spacing of not more than 100mm.

[0037] The outer horizontal reinforcing bars are HRB400E grade steel bars with a diameter of 12~14mm and a vertical spacing of 100~150mm.

[0038] A concrete layer with a strength grade of not less than C40 is poured outside the steel reinforcement cage.

[0039] In this embodiment, the steel pipe pile includes a steel pipe, reinforcing bars, and an underwater concrete layer. During subsequent construction of the underground structure, part of the underwater concrete layer needs to be removed, and external vertical reinforcing bars and external horizontal reinforcing bars for the steel pipe pile need to be installed. Finally, the concrete layer is constructed, thus transforming the steel pipe pile into a reinforced concrete column.

[0040] In this embodiment, the cast-in-place pile includes a cast-in-place pile reinforcement cage and an underwater concrete layer. The cast-in-place pile reinforcement cage includes vertical reinforcing bars and horizontal spiral reinforcing bars, wherein the vertical reinforcing bars extend from the top of the cast-in-place pile. In the initial state of the steel pipe pile, they are poured into the steel pipe pile, and after the structure is built, they are located in the foundation of the underground structure.

[0041] In this embodiment, the outer horizontal reinforcing bars are located within the range from the foundation of the subsequently constructed underground structure to the bottom slab of the subsequently constructed underground structure.

[0042] In this embodiment, the steel mesh consisting of the vertical reinforcing bars and the horizontal reinforcing bars surrounding the steel pipe pile is tied with 18# galvanized binding wire.

[0043] The construction method of this utility model is as follows: like Figure 1 For the area from the top of the foundation piles of the first-built building to the bottom of the foundation beams of the subsequently constructed underground structure, a steel pipe pile scheme is adopted. The bottom of the steel pipe pile is inserted 2.5~3.5m into the foundation piles of the first-built building. The reinforcing cage at the top of the steel pipe pile must be inserted into the steel pipe pile for a length of not less than 1.5m and welded firmly, with a reserved length at the top for anchoring into the foundation beams of the first-built building. The steel pipes, the reinforcing cages of the piles, and the reinforcing cages at the top of the steel pipe piles are hoisted into the pile hole as a whole, and underwater concrete of grade not lower than C35 is poured up to the top of the steel pipe piles, i.e., the bottom of the foundation beams of the first-built building.

[0044] like Figure 2 After the underwater concrete pouring of steel pipe piles and cast-in-place piles is completed, the construction of the foundation slab and beams of the building is carried out. The pile heads of the steel pipe piles are excavated, and the laitance concrete and the concrete around the top of the steel pipe piles are manually removed. The reinforcing bars of the top cap of the steel pipe piles and the foundation slab and beams of the building are tied, and the upper part of the steel pipe piles is pre-embedded with external vertical reinforcing bars. Then, the concrete of the top cap of the steel pipe piles and the foundation slab and beams of the building is poured, and the construction of the columns and main structure of the building (and other remaining structures of the building) continues upward.

[0045] like Figure 3 When constructing the underground structure later, after the excavation of the earthwork below the foundation beams of the first building is completed, the underwater concrete above the bottom of the foundation of the underground structure and below the top of the steel pipe piles of the first building should be manually removed immediately. Then, the external vertical reinforcement and external horizontal reinforcement of the steel pipe piles should be installed from the top of the cast-in-place piles upwards. Then, the foundation and foundation concrete of the later structure should be poured. The spacing, quantity, and specifications of the external vertical reinforcement of the steel pipe piles are consistent with those of the upper external vertical reinforcement of the pre-embedded steel pipe piles, and they are connected by welding. The external horizontal reinforcement and the two types of external vertical reinforcement form a reinforcement cage. After the reinforcement cage and the reinforcement of the foundation and foundation of the later underground structure are integrated, the concrete of the foundation and foundation of the later underground structure is poured as a whole.

[0046] like Figure 4 and Figure 5 As shown, for the subsequently constructed underground structure, horizontal reinforcing bars are tied around the steel pipe piles above the foundation slab, forming a reinforcing steel skeleton together with the vertical reinforcing bars. After the installation of the vertical and horizontal reinforcing bars, formwork is installed on the outside of the steel pipe piles, and concrete with a strength grade of not less than C40 is poured. The concrete and the reinforcing steel skeleton form a rigid structure, reinforcing and strengthening the overall strength, stability, and durability of the steel pipe piles. Thus, the steel pipe piles at the top of the foundation piles of the previously constructed building are transformed into reinforced concrete columns, continuing to provide stronger and more durable support for the structure of the previously constructed building.

[0047] Under the premise of not affecting the implementation of underground structures, the above-ground buildings can be built first, and the implementation conditions for the underground structures to be built later can be reserved simultaneously. Under the premise of minimizing structural disturbance to the buildings built first, the underground structures built later can effectively utilize the foundation piles of the buildings built first.

[0048] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure, characterized in that, include: - Pile foundation, including the lower cast-in-place piles and the steel pipe piles fixedly connected to the top of the cast-in-place piles; - Construct the building first, supported on top of the steel pipe piles; - A later-built underground structure, located below the earlier-built structure and supported on top of cast-in-place piles, with the shafts of steel pipe piles passing through the later-built underground structure.

2. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure as described in claim 1, characterized in that: The bottom of the steel pipe of the steel pipe pile is inserted into the cast-in-place pile and welded to the reinforcing cage of the cast-in-place pile; the bottom of the reinforcing cage skeleton at the top of the steel pipe pile is inserted into the steel pipe of the steel pipe pile and welded to the reinforcing bars inside the steel pipe pile; the upper part of the reinforcing cage skeleton at the top of the steel pipe pile is anchored into the pre-constructed building; underwater concrete is poured into the steel pipe pile and the cast-in-place pile as a whole to form an underwater concrete layer, with the pouring height reaching the top of the steel pipe of the steel pipe pile.

3. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure as described in claim 2, characterized in that: The bottom of the steel pipe of the steel pipe pile is inserted into the cast-in-place pile with an insertion length of 2.5~3.5m; the bottom of the steel reinforcement cage at the top of the steel pipe pile is inserted into the steel pipe of the steel pipe pile with an insertion length of not less than 1.5m.

4. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure as described in claim 2, characterized in that: The steel pipe pile top reinforcement cage includes vertical reinforcement and horizontal reinforcement; the vertical reinforcement uses HRB400E grade steel bars with a diameter of not less than 25mm and a horizontal spacing of not more than 100mm; the horizontal reinforcement uses HRB400E grade steel bars with a diameter of 12~14mm and a vertical spacing of 100~150mm; the underwater concrete is concrete with a strength grade of not less than C35.

5. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure according to claim 1, characterized in that: The pre-constructed building includes a steel pipe pile top cap, a bottom slab beam, pre-constructed building columns, and the main structure. The steel pipe pile top cap is set on top of the steel pipe piles, and the steel pipe piles pass through the steel pipe pile top cap. The bottom slab beam is supported on the steel pipe pile top cap, and the pre-constructed building columns are set on the bottom slab beam.

6. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure as described in claim 5, characterized in that: The underground structures constructed later include an underground structure foundation, an underground structure base slab, and a main structure that are connected as a whole. The underground structure foundation is located at the bottom of the steel pipe piles and supported on the cast-in-place piles. The underground structure base slab is supported on the underground structure foundation, and the steel pipe piles pass through the underground structure foundation and the underground structure base slab.

7. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure as described in claim 6, characterized in that: A ring of external vertical reinforcing bars is installed on the upper outer side of the steel pipe pile. The external vertical reinforcing bars are located inside the top cap of the steel pipe pile, with their lower ends extending from the bottom of the top cap. A ring of external vertical reinforcing bars and external horizontal reinforcing bars are installed on the middle outer side of the steel pipe pile, above the cast-in-place pile and below the top cap of the steel pipe pile. The external vertical reinforcing bars on the upper outer side of the steel pipe pile correspond one-to-one with the external vertical reinforcing bars on the middle outer side of the steel pipe pile, and are connected by welding, so that the external vertical reinforcing bars and external horizontal reinforcing bars form a reinforcing steel skeleton.

8. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure according to claim 7, characterized in that: The outer vertical reinforcement uses HRB400E grade steel bars with a diameter of not less than 25mm and a horizontal spacing of not more than 100mm.

9. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure, as described in claim 7, characterized in that: The outer horizontal reinforcing bars are HRB400E grade steel bars with a diameter of 12~14mm and a vertical spacing of 100~150mm.

10. A pile-column conversion structure for a pre-constructed building and a subsequently constructed underground structure, as described in claim 7, characterized in that: A concrete layer with a strength grade of not less than C40 is poured outside the steel reinforcement cage.

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