Method for construction of underground works in narrow areas

Abstract

The application discloses a narrow area underground building construction method, comprising the following steps: S1, constructing a supporting structure at the boundary of the area to be constructed; S2, after the supporting structure is constructed, excavating the earthwork of the construction area; S3, when the foundation pit is excavated to a preset depth, performing secondary supporting by using a steel sheet pile to form a core tube underground construction area; S4, after the underground part of the core tube of the building to be constructed is constructed in the core tube underground construction area, performing the construction of the upper structure and the surrounding area of the underground structure of the core tube; S5, when the core tube of the building to be constructed is constructed to the ground level, performing the construction of the top plate of the part of the basement of the building to be constructed and completing the closure of the top plate of the basement; S6, using the core tube as a soil removal channel to gradually complete the earth excavation work of the underground space, thereby completing the earth excavation work of the first floor of the basement to the bottom plate of the basement, and constructing the underground building upwards from the bottom plate of the basement after the earth excavation work of the underground space is completed.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a method for constructing underground buildings in narrow areas. Background Technology

[0002] As the value of urban land increases, urban underground space has been developed more extensively, with the construction of various underground utility tunnels and subway tunnels springing up like mushrooms after rain. To make full use of land resources, engineering projects are being laid out towards higher and deeper spatial forms. However, with the introduction of national policies restricting building height, and the fact that underground space is not included in the floor area ratio calculation, the development of underground space has been accelerated.

[0003] With the continuous advancement of urban renewal, governments at all levels are making new plans for urban space. Existing old factories and narrow areas are being utilized more effectively. New buildings in these areas are complex and intertwined, and basement structures and pipelines are dilapidated, with unclear records and a lack of available information. Under these circumstances, it is inevitable that urban development and construction in blank urban areas will disturb surrounding buildings. How to achieve minimal disturbance and pollution in urban renewal construction while maintaining strong economic viability and feasibility is a current challenge for the engineering community. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of the prior art and disclose a construction method for underground buildings in narrow areas. The construction method for underground buildings in narrow areas of this invention adopts block and area construction. The bottom area of ​​the core tube is constructed first, and the counterweight soil is reserved to ensure the stability of the foundation pit and the surrounding building environment. The construction of the core tube is carried out first and the periphery is followed. The center and the periphery cooperate with each other and interweave to achieve rapid construction.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A method for constructing underground structures in a narrow area, the method comprising the following steps:

[0007] S1: Construct a support structure at the boundary of the area to be constructed, the support structure including support piles and / or diaphragm walls, thereby completing the isolation support between the area to be constructed and the outside.

[0008] S2: After the support structure is completed, the earthwork excavation of the construction area will be carried out. In the top area, excavation will be carried out along the outer support structure. When excavating inward, the slope will be gentler than 1:1 and supported by the slope protection structure.

[0009] S3: When the foundation pit is excavated to the preset depth, secondary support is provided by steel sheet piles to form a water-retaining and soil-retaining structure. Excavation of the proposed building construction area is carried out with the steel sheet piles as the boundary to form the underground construction area of ​​the core tube.

[0010] S4: Complete the construction of the underground part of the core tube of the proposed building in the underground construction area of ​​the core tube, and then carry out the construction of the superstructure and the surrounding area of ​​the underground structure of the core tube;

[0011] S5: When the core tube of the proposed building is constructed to ±0.00, the construction of the roof slab of part of the basement of the proposed building shall be carried out and the basement roof slab shall be sealed.

[0012] S6: Using the core tube as an excavation channel, the excavation work of the underground space is gradually completed, thereby completing the excavation work of the first basement floor and the basement floor slab. After the excavation work of the underground space is completed, the underground building is constructed upward from the basement floor slab.

[0013] According to a preferred embodiment, in step S1, the selection of support piles and / or diaphragm walls is completed based on the settlement displacement deformation of groundwater and the surrounding environment in the area to be constructed.

[0014] According to a preferred embodiment, double-row pile support is used when the groundwater content is below a threshold and the soil permeability coefficient is less than a threshold; when the groundwater level is higher than the prefabrication, underground continuous walls are used to complete the integrated support and waterproofing.

[0015] According to a preferred embodiment, the slope protection structure in step S2 is a slope protection soil nail, and the slope protection soil nail is provided with a barbed structure.

[0016] According to a preferred embodiment, in step S3, the sheet piles are driven into the underground soil or permeable layer.

[0017] According to a preferred embodiment, in step S3, the top of each sheet pile is supported by a waler arranged laterally, thereby preventing the sheet pile from tilting inward.

[0018] According to a preferred embodiment, in step S4, the construction of the surrounding area of ​​the upper structure of the core tube includes: attaching and installing vertical conveying equipment on the core tube, wherein the vertical conveying equipment includes at least a construction tower crane and a construction hoist.

[0019] According to a preferred embodiment, step S5 further includes constructing support columns to complete the support of the basement roof slab.

[0020] According to a preferred embodiment, in step S6, during the excavation of the counterweight soil in the basement space, anchor bolts are installed while excavating to ensure the stability of the surrounding support structure of the underground construction area.

[0021] The aforementioned main solution of the present invention and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed by the present invention. Those skilled in the art, after understanding the solution of the present invention, will realize that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by the present invention, and will not be exhaustively listed here.

[0022] The beneficial effects of this invention are:

[0023] The construction method for underground buildings in narrow areas of this invention adopts block and area construction. The bottom area of ​​the core tube is constructed first, and the counterweight soil is reserved to ensure the stability of the foundation pit and the surrounding building environment. The construction of the core tube is carried out first and the perimeter is followed. The center and the perimeter cooperate with each other and interweave to achieve rapid construction. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the construction of underground buildings in a narrow area according to the present invention. Detailed Implementation

[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Furthermore, it should be noted that, unless otherwise specified, the structures, connections, positions, power sources, etc. involved in this invention are all things that a person skilled in the art can know without creative effort based on the prior art.

[0031] Example 1

[0032] This embodiment discloses a method for constructing underground structures in narrow areas, dividing the underground construction area into six zones. The method for constructing underground structures in narrow areas includes the following steps:

[0033] Step S1: Construct a support structure at the boundary of the area to be constructed. The support structure includes support piles and / or diaphragm walls, thereby completing the isolation support between the area to be constructed and the outside.

[0034] Prioritizes step S1, selecting support piles and / or diaphragm walls based on the settlement, displacement, and deformation of groundwater and the surrounding environment in the construction area. Double-row pile support is used when the groundwater content is below a threshold and the soil permeability coefficient is less than a threshold; when the groundwater level is higher than the precast concrete, diaphragm walls are used to achieve integrated support and waterproofing.

[0035] Step S2: After the support structure is completed, excavation of the construction area is carried out. In the top area, excavation is carried out along the outer support structure, and inward, excavation is carried out at a slope gentler than 1:1, and supported by a slope protection structure. This is how Zone 1 is formed by excavation.

[0036] Preferably, the slope protection structure in step S2 is a slope-retaining soil nail, which is equipped with a barbed structure. The specifications of the reinforcing bars in the slope-retaining soil nail and the spacing of the reinforcing mesh can be adjusted according to calculations or design requirements.

[0037] Step S3: When the foundation pit is excavated to the preset depth, secondary support is provided with steel sheet piles to form a water-retaining and soil-retaining structure. The construction area of ​​the proposed building is excavated with the steel sheet piles as the boundary to form the underground construction area of ​​the core tube.

[0038] Preferably, in step S3, the sheet piles are driven into the underground soil or permeable layer. In step S3, the top of each sheet pile is supported by a horizontally arranged waler, thereby preventing the sheet piles from tilting inward.

[0039] Specifically, after excavating to a certain depth in Zone 1 of the foundation pit, before proceeding to Zone 2, foundation treatment (including engineering pile construction) and support work (support structure construction) will be carried out within the zone. Zone 2, as the core tube area of ​​the building structure, still requires excavation for initial construction and has a dry working face. In this case, water-stop steel sheet piles can be selected to form an interlocking structure that can both retain soil and stop water. The support piles are driven into the impermeable layer or the weakly permeable layer. During the excavation, the upper part is supported while excavating to ensure the rigidity of the support structure.

[0040] Before excavation in Area 2, advanced steel sheet pile construction was carried out. In this area, steel section piles were used for sheet pile construction, avoiding the waste of mechanical work involved in driving empty piles into the original ground, reducing operational difficulty, and further improving the construction quality of the engineering piles. Steel section pile construction simplified the construction difficulty of pile joints, requiring only bolt connections, rebar lap splices, welding, or mechanical connections. Moreover, the high strength and rigidity of steel sections reduced the number of piles, allowing for the installation of large-span underground spaces without compromising structural bearing capacity.

[0041] Step S4: Complete the construction of the underground part of the core tube of the proposed building in the underground construction area of ​​the core tube, and then carry out the construction of the superstructure and the surrounding area of ​​the underground structure of the core tube.

[0042] Preferably, in step S4, the construction of the area surrounding the upper structure of the core tube includes: attaching and installing vertical conveying equipment on the core tube, wherein the vertical conveying equipment includes at least a construction tower crane and a construction hoist.

[0043] Specifically, once the underground portion of the core tube structure is completed, construction of the superstructure and the surrounding areas of the underground structure (including areas 3 and 4) can proceed simultaneously. The advantages of this construction method are: 1. It increases construction speed by breaking down the work into smaller parts, creating more working surfaces and intersections, and using higher points to drive lower points. Vertical transport equipment such as tower cranes and construction hoists can be attached to the core tube for installation and early commissioning. 2. It optimizes resource allocation. Once the formwork supports within the core tube reach the design strength, they can be dismantled and directly transported to the outer areas via chutes, significantly improving turnover speed and avoiding energy consumption in vertical and horizontal transport. 3. The core tube portion of the main building under construction can serve as a transport channel and anchoring support point for external area construction. Depending on specific geological and environmental requirements, the surrounding areas can be constructed using either forward or reverse methods. Areas 3 and 5 (the area on the left side of the underground core tube) can be constructed using either reverse (or forward) methods, while areas 4 and 6 can be constructed using forward methods.

[0044] Step S5: When the core tunnel of the proposed building is constructed to ±0.00, the roof slab of part of the basement of the proposed building is constructed, and the basement roof slab is sealed. Step S5 also includes constructing support columns to support the basement roof slab.

[0045] Specifically, when the core tube is constructed to ±0.00, the basement roof slab of Zone 3 can be sealed first, the pile heads can be treated, and the structural roof slab of Zone 3 is connected to the continuous capping beam on the support piles and the basement roof slab of the core tube in Zone 1. At this time, the roof slab of Zone 3 can serve as a storage area for construction materials and a construction access passage for the area above ±0 of the core tube. The structural roof slab of Zone 3 can also serve as a lateral support structure for the support piles, so that it is not necessary to install separate support anchors for the protection of this support structure during subsequent excavation.

[0046] Step S6: Using the core tube as an excavation channel, the excavation work of the underground space is gradually completed, thereby completing the excavation work of the first basement floor and the basement floor slab. After the excavation work of the underground space is completed, the underground building is constructed upward from the basement floor slab.

[0047] Preferably, in step S6, during the excavation of the counter-pressure soil in the basement space, anchor bolts are installed while excavating to ensure the stability of the surrounding support structure of the underground construction area.

[0048] The construction method for underground buildings in narrow areas of this invention adopts block and area construction. The bottom area of ​​the core tube is constructed first, and the counterweight soil is reserved to ensure the stability of the foundation pit and the surrounding building environment. The construction of the core tube is carried out first and the perimeter is followed. The center and the perimeter cooperate with each other and interweave to achieve rapid construction.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for constructing underground structures in a narrow area, characterized in that, The construction method for underground structures in narrow areas includes the following steps: S1: Construct a support structure at the boundary of the area to be constructed, the support structure including support piles and / or diaphragm walls, thereby completing the isolation support between the area to be constructed and the outside. S2: After the support structure is completed, the earthwork excavation of the construction area will be carried out. In the top area, excavation will be carried out along the outer support structure. When excavating inward, the slope will be gentler than 1:1 and supported by the slope protection structure. S3: When the foundation pit is excavated to the preset depth, secondary support is provided by steel sheet piles to form a water-retaining and soil-retaining structure. Excavation of the proposed building construction area is carried out with the steel sheet piles as the boundary to form the underground construction area of ​​the core tube. S4: Complete the construction of the underground part of the core tube of the proposed building in the underground construction area of ​​the core tube, and then carry out the construction of the superstructure and the surrounding area of ​​the underground structure of the core tube; S5: When the core tube of the proposed building is constructed to ±0.00, the construction of the roof slab of part of the basement of the proposed building shall be carried out and the basement roof slab shall be sealed. S6: Using the core tube as an excavation channel, the excavation work of the underground space is gradually completed, thereby completing the excavation work of the first basement floor and the basement floor slab. After the excavation work of the underground space is completed, the underground building is constructed from the basement floor slab upwards. In step S1, the selection of support piles and / or diaphragm walls is completed based on the settlement, displacement and deformation of groundwater and the surrounding environment in the area to be constructed. When the groundwater content is below the threshold and the soil permeability coefficient is less than the threshold, double-row pile support is used; when the groundwater level is above the threshold, diaphragm walls are used to complete the integrated support and waterproofing. In step S2, the slope protection structure is a slope-retaining soil nail, and the slope-retaining soil nail is set with a barbed structure; In step S3, the steel sheet piles are driven into the underground soil or weakly permeable layer; In step S3, the top of each sheet pile is supported by a horizontally installed waler, thereby preventing the sheet pile from tilting inward. In step S4, the construction of the surrounding area of ​​the upper structure of the core tube includes: attaching and installing vertical conveying equipment on the core tube, wherein the vertical conveying equipment includes at least a construction tower crane and a construction hoist. Step S5 also includes constructing support columns to complete the support of the basement roof slab; In step S6, during the excavation of the counter-pressure soil in the basement space, anchor bolts are installed while excavating to ensure the stability of the surrounding support structure of the underground construction area.

Images