CN113833020B - Construction method of large fish-belly inclined column structure in underground space - Google Patents

Abstract

The invention provides a construction method for a large-scale fish-bellied inclined column structure in an underground space. The invention abandons the traditional beam and column system and adopts a fish-bellied multi-layered segmented inclined column structure, including reserved joints for each layer of inclined columns and splicing sections for each layer of inclined columns. The multi-layer segmented inclined column structure of the present invention adopts the construction method of cover and excavation combined with cover and excavation. During construction, the reserved joints of the inclined columns of each layer are first made inversely, and then the splicing sections of the inclined columns of each layer are made in parallel; The symmetrical arrangement of the inclined columns improves the natural lighting of the underground structure and increases the usable area of the underground space. The construction method of the invention overcomes the shortcomings of narrow construction site, many surrounding ground buildings, and complex ground traffic composition, which not only facilitates construction, improves the safety of construction, but also shortens the construction period.

Description

Construction method of large fish-belly oblique column structure in underground space

technical field

The invention relates to the technical field of building construction, in particular to a construction method for a large fish-belly oblique column structure in an underground space.

Background technique

Nowadays, with the gradual escalation of competition between cities and even countries, the competition between their internal regions and cities has become more intense, which has led to the increasingly prominent problem of urban traffic congestion. Traditional transportation hubs are increasingly unable to meet the needs of the people due to lack of characteristics, only satisfied with functions, and monotonous structural forms. One of the means to solve this problem is to establish a three-dimensional transportation system, build an underground comprehensive transportation hub, fully develop and Utilize urban underground space resources. However, the underground comprehensive hub development project in the bustling downtown area of a big city usually has problems such as a small site, many surrounding above-ground buildings, and complex ground transportation.

For large underground transportation hubs, how to improve its limited ventilation and lighting and make full use of the underground use space is often the focus of design, but the traditional beam-column structural stress system cannot well satisfy the functional and aesthetic design of underground transportation hubs need. Complex pavement deconstruction conditions, strict surrounding environment restrictions, and the unique structure of the underground structure during the construction process using the cover-and-excavation upside-down method conflict with the upside-down method, all of which pose great challenges to the construction method of the underground structure.

Contents of the invention

In order to meet the design requirements of openness and space effects in the limited underground space of the underground transportation hub in modern architectural design and to improve its ventilation and lighting conditions, and to abandon the traditional beam and column system, the present invention adopts a fish-belly multi-layer segmental oblique Column structure, a construction method of large fish-belly oblique column structure in underground space is proposed.

The core technology of the present invention is that when adopting the cover-and-excavation construction method, the reserved joints of the inclined columns of each layer are reversed first, and then the splicing sections of the inclined columns of each layer are made sequentially. Multi-storey segmented slanted columns. The inclination angle of the multi-layer segmented slanted columns has been determined before the construction of the slanted column splicing section, which greatly simplifies the construction. At the same time, the symmetrical arrangement of the fish-bellied slanted columns is also more conducive to the natural lighting of the underground structure.

The present invention is specifically achieved through the following technical solutions:

A construction method for a large fish-belly inclined column structure in an underground space, comprising the following steps:

1) Construction preparation: According to the design size, the reserved joints of shaped steel beams and slanted columns are processed in the processing factory, and the reserved joints of slanted columns are connected with the main structural beams into a whole;

2) Cushion and embedded parts construction: Excavate the earthwork in the cover plate area, and pour the cushion concrete immediately after the foundation pit of the cover plate is excavated and cleared the bottom; excavate under the inclined column as the "foundation" for erecting support , and then lay out wires and install embedded steel plates in the "foundation" as the erection support, connect the bottom of the steel plates with steel bars, and pour concrete;

3) Measurement and setting out: model the reserved joints of shaped steel beams and inclined columns, calculate the coordinates of the installation joints according to the design coordinates and the elevation of the installation position, and when the coordinates of the calculated installation joints are consistent with the coordinates called out from the modeling, it will be used as the measurement setting out Basis; Weld the positioning steel plate at the installation side line that pops up, and then install the reserved joints of the inclined columns of each layer. After the installation is completed, measure the control points of the upper and lower ends of the reserved joints of the inclined columns, and make the splicing sections of the inclined columns of each layer accordingly;

4) Hoisting of the reserved joints of shaped steel beams and inclined columns: install the reserved joints of inclined columns to the design position according to the stakeout position in step 3, after the reserved joints of inclined columns are installed, process the shaped steel beams according to the actual length of the site and install them ;

5) Positioning and strengthening of reserved joints of shaped steel beams and inclined columns: review and fine-tune the elevation of the top of shaped steel beams and the axis, verticality, and angle of reserved joints of inclined columns, and perform reinforcement measures after the above positioning is completed; Check the axes and elevations of the joints reserved for the shaped steel beams and inclined columns, and proceed to the next step only after they are correct;

6) Construction of the splicing section of the inclined column: After the construction of the above main structure is completed, the splicing section of the inclined column shall be constructed by the method of cover and excavation; the splicing section of the inclined column shall be hoisted and moved to the position of the splicing section, and the splicing of the inclined column shall be adjusted by using the reserved limit splint The section and the reserved joint of the inclined column are completely aligned, and the full penetration welding is performed after accurate positioning.

As a further improvement of the above technical solution, the reserved joints of the slanted columns of each layer and the spliced sections of the slanted columns of each layer constitute a fish-bellied multi-layer segmented slanted column.

As a further improvement of the above-mentioned technical solution, the fish-belly symmetrical arrangement of the multi-layer segmented inclined columns ensures the natural lighting of the underground space to the greatest extent.

As a further improvement of the above-mentioned technical scheme, the multi-layer segmental slanted column adopts a construction method combining cover-excavation reverse operation and cover-excavation sequential operation: during construction, the slanted columns of each layer are first reversed to reserve joints, and then the slanted columns of each layer are constructed in an orderly manner. Column splicing segment.

Considering the large number and heavy weight of the fish-belly slanted columns, loads are applied to each layer of the slabs, resulting in excessive stress on the temporary columns. In this invention, the joints reserved for the slanted columns of each layer are covered first, which can reduce the number of temporary columns. reduce the horizontal deformation of the enclosure structure during the construction of a fish-belly complex large-scale underground structure, reduce the engineering volume of the temporary support system and the demand for temporary facilities such as large-scale excavation work platforms, thereby reducing the impact on the surrounding environment. The safety of the project construction is improved and the construction period is shortened; the reserved joints of the slanted columns of each layer are reversed, and then the splicing sections of the slanted columns of each layer are covered and excavated, which can reduce the cross operation during the assembling process of the slanting columns and reduce the multi-layer assembly process. The operation interference between the upper and lower floors can effectively increase the construction work area, thereby significantly improving the quality of the project.

As a further improvement of the above technical solution, temporary columns are installed between the slabs to provide temporary support for the main structure before the construction of the inclined column splicing section.

As a further improvement of the above technical solution, a skylight of transparent material is installed between the fish-belly slanted columns on the roof, in order to improve the natural lighting of the underground structure.

As a further improvement of the above-mentioned technical solution, excavate 4m of the earthwork in the cover plate area described in step 2), and excavate to 2.2m below the top plate, and excavate the remaining layers to 2m at the bottom of the laminate; Dig to 200mm close to the base.

As a further improvement of the above technical solution, the "foundation" mentioned in step 2) as the erection support is 3000mm*3000mm, the depth is 400mm, and Φ14@200 steel mesh is arranged inside; 4 steel plates are pre-embedded on the top of the "foundation". The size is 1000mm*600mm*16mm; at the same time, 600mm*600mm*16mm supporting steel plates are pre-embedded in the inclined direction of the inclined column and the direction of the steel beam.

As a further improvement of the above technical solution, after the fine-tuning in step 5), it is necessary to ensure that the elevation deviation of the steel beam top is within ±2 mm, the axis deviation of the reserved joint of the inclined column is less than 3 mm, and the verticality of the reserved joint of the inclined column is less than 1 mm.

As a further improvement of the above technical solution, in step 6), the specific operation of lifting the splicing section of the inclined column to the position of the splicing section is to use the two lifting points set by the steel beam to pull the upper and lower ends of the splicing section of the inclined column horizontally and move to the splicing section. After the segment position, the hook is slowly unloaded, and the upper and lower ends are tightened to flatten the rope to make the splicing segment of the inclined column in place.

As a further improvement of the above technical solution, before the welding of the slanted column splicing section in step 6), an operation frame needs to be set up according to the construction requirements, so as to facilitate the installation and welding of the slanting column splicing section.

As a further improvement of the above-mentioned technical scheme, when the steel beam and the inclined column are welded, the limit block is used to fix the steel beam. When installing, the steel column and the edge of the steel beam are first positioned. The positioning board is used for positioning, and finally the elevation needs to be checked to ensure that the elevation and plane position are accurate.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention utilizes CAD to establish a coordinate system and obtains the position coordinates of each control point at the top and bottom of the reserved joint of the slanted column by measuring with a total station to carry out precise positioning and lofting of the slanted column, and project the control points at the top of the slanted column on the floor An optical plummet or a hanging hammer is used to lead to the formwork support frame to determine the position of the formwork edge, which improves the efficiency of positioning and installation of the inclined column.

2. The present invention adopts the construction method of cover-excavation reverse operation combined with cover-excavation sequential operation, which overcomes the shortcomings of narrow construction site, numerous surrounding buildings on the ground, complex ground traffic composition, etc., and shortens the construction period.

3. The invention greatly facilitates the construction and improves the safety of engineering construction by designing the slanting columns into multi-layer and segmented forms. At the same time, the symmetrical arrangement of fish-belly inclined columns also provides sufficient upper space for the underground structure, increases the usable area of the underground space, and is conducive to increasing natural lighting.

Description of drawings

Fig. 1 is a schematic flow chart of the construction method of the large-scale fish-belly inclined column structure in the underground space of the present invention.

Fig. 2 is a three-dimensional view of the structure of a large fish-belly oblique column in an underground space according to the present invention.

Fig. 3 is a cross-sectional view of a large fish-belly oblique column structure in an underground space according to the present invention.

Fig. 4 is a three-dimensional schematic diagram of the large fish-belly inclined column structure in the underground space of the present invention without installing the spliced section of the inclined column.

Fig. 5 is a cross-sectional view of the large fish-bellied slanted column structure in the underground space of the present invention without the splicing section of the slanted column installed.

In the figure: 2. Shaped steel beam; 3. Temporary column; 4. Transparent material; 11. Splicing section of inclined column; 12. Reserved joint for inclined column.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of this application, it should be understood that the use of words such as "first" and "second" to define parts is only for the convenience of distinguishing corresponding parts. Therefore, it should not be construed as a limitation of the protection scope of this application.

In the description of the present application, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description. In the absence of a contrary statement, these orientation words do not indicate or imply the device or element referred to It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the protection scope of the present application; the orientation words "inner and outer" refer to the inner and outer relative to the outline of each component itself.

The present application will be described in detail below in conjunction with accompanying drawing 2 .

Fig. 2 is a three-dimensional view of the large-scale fish-belly slanted column structure in the underground space of the present invention. In addition to the main roof, bottom plate, and laminates of each layer, the structure also includes steel beams 2 of each layer, temporary columns 3, and splicing sections of slanted columns of each layer 11. Joints 12 are reserved for inclined columns on each floor, of which:

Shaped steel beam 2: The shaped steel beam 2 of each layer is connected with the top plate, bottom plate, and laminates of each layer;

Temporary column 3: the temporary column 3 is installed between the top plate, the bottom plate, and each layer of plates;

Transparent material 4: The skylight of transparent material 4 is set between fish-belly slanted columns at the roof;

Reserved joints 12 for slanted columns: The reserved joints 12 for slanted columns of each layer are welded to the steel beams 2 of each layer;

Slanting column splicing section 11: The splicing section 11 of each layer of slanting column is welded with the reserved joint 12 of each layer of slanting column to form a fish-belly multi-layer segmental slanting column.

Example

A construction method for a large fish-belly inclined column structure in an underground space, comprising the following steps:

step one:

Construction preparation: familiarize yourself with and review the construction drawings and design documents, do a good job in explaining the construction organization design, process the shaped steel beam 2 and the reserved joint 12 of the slanted column in the professional steel structure processing plant, and connect the reserved joint 12 of the slanted column with the The beams of the main structure are connected as a whole.

Step two:

Cushion and embedded parts construction:

1. Earthwork excavation: The excavation of the earthwork above the cover plate of the main structure adopts the open cut method from west to east; the earthwork excavation in the area where the cover plate is constructed is about 4m, and the excavation ends at 2.2m below the roof, and the remaining layers are excavated to 2m from the bottom of the laminate;

2. Cushion layer construction: when the excavation of the foundation pit of the cover plate is close to the base of 200mm, manually cooperate with the excavator to clear the bottom, and immediately construct the cushion layer concrete after cleaning the bottom layer. The cushion layer is poured with C20 concrete, and the pouring thickness is 150mm;

3. Slanted column foundation construction: during construction, an enlarged foundation is constructed under the slanted column. The foundation is 3000mm*3000mm, the depth is 400mm, and Φ14@200 steel mesh is laid inside, and 4 foundation steel plates are pre-embedded on the top of the foundation, and the steel plate size is 1000mm *600mm*16mm; at the same time, 600mm*600mm*16mm supporting steel plates are pre-embedded in the inclined direction of the inclined column and the 2 directions of the steel beam, as the basis for erecting the support;

4. Pre-embedded steel plate positioning construction: After the foundation excavation is completed, the measurement team will draw the position of the pre-embedded steel plate in the foundation, and then drive 4 steel plates into the soil layer at the 4 corner points with a length of not less than 1m. Φ22 steel bars, and then install the pre-embedded steel plates. During the installation process, the measurement team will measure and adjust the whole process. The elevation error should not exceed 5mm.

Step three:

Measurement Stakeout:

1. Coordinate calculation: By modeling the steel beam 2 and the reserved joint 12 of the inclined column, any position of the reserved joint 12 of the inclined column can be called out at any time, the position of any elevation and the coordinates of the position of the reserved joint 12 of the inclined column can be manually calculated. Calculate the coordinates of four points at the upper and lower ends of each installation joint according to the design coordinates and the elevation of the installation location. After the calculated coordinates are completely consistent with the coordinates called out by modeling, they will be used as the basis for measuring and setting out;

2. First, the measurement team marks the corner points of the shaped steel beam 2 or the reserved joint 12 of the inclined column to be constructed on the cushion, and measures the actual cushion elevation to determine the height of the temporary support. The emitted axis is measured with a ruler to pop up the installation edge of the reserved joint 12 of the inclined column, and then the positioning steel plate is welded at the installation edge. After the installation of the reserved joints 12 for each layer of inclined columns is completed, four control points are measured at the upper and lower ends of the reserved joints 12 for each layer of inclined columns, and the manufacturer cuts materials to make the inclined column splicing section 11 according to the actual measurement situation.

Step four:

Hoisting of shaped steel beams 2 on each floor and reserved joints 12 for inclined columns: The reserved joints 12 for inclined columns are hoisted with a 50t truck crane, and the reserved joints 12 for inclined columns are hoisted to the ground tank mobile tool with horizontal rotation function, and the power is adopted The 5t hoist is used for traction, and the channel steel is used as the track for the ground tank moving tool, which is moved according to the stakeout position, and the reserved joint 12 of the inclined column is transported to the designed position for installation. After the installation of the reserved joint 12 of the inclined column is completed, the steel beam 2 is processed according to the actual length on site, and the crane is used for installation after the processing is completed.

Step five:

Positioning and strengthening of shaped steel beams 2 on each floor and reserved joints 12 for inclined columns: After the reserved joints 12 for inclined columns are in place, on-site surveyors use a total station to check the beam top elevation and axis, and the verticality and angle of reserved joints 12 for inclined columns Re-check, fine-tune adjustment of the 12-axis axis of the reserved joint of the slanted column using a crane and manual left-right movement to ensure that the axis deviation is less than 3mm, and use temporary brackets to fine-tune the elevation of the top of the beam, and finally reach the design elevation, ensuring that the elevation deviation of the top of the beam is ±2mm , The verticality of the reserved joint 12 of the inclined column is less than 1mm. After the positioning of the reserved joint 12 of the slanted column is completed, it is necessary to take reinforcement measures for the reserved joint 12 of the slanted column. The end of the shaped steel beam 2 is supported by an H-shaped steel support column to ensure that the shaped steel beam is stable and does not shake.

Step six:

Measurement review: After the steel beam 2 and the reserved joint 12 of the inclined column are reinforced, the total station is used to recheck the axis and elevation of the steel beam 2 and the reserved joint 12 of the inclined column, and the next process can only be entered after confirming that it is correct.

Step seven:

Construction of splicing section 11 of slanted columns: After the construction of all main structures in the underground space is completed, splicing section 11 of slanted columns shall be constructed in sequence.

1. Use the preset hook of the upper steel beam to vertically lift the splicing section 11 of the inclined column;

2. Use the two lifting points set on the upper steel beam to pull the upper and lower ends of the splicing section 11 of the inclined column horizontally, and gradually shift to the position of the splicing section; the vertical hook is slowly unloaded.

3. Tighten the upper and lower flat pull ropes, the splicing section 11 of the slanting column is slowly in place, use the reserved limit splint and other measures to adjust the splicing section 11 of the slanting column and completely align with the reserved joint 12 of the slanting column, and the joint reserved for the slanting column 12 and the splicing section 11 of the inclined column are welded by full penetration welding after accurate positioning to ensure that the welding quality is qualified, and the welding seam is 100% inspected.

In step 7 of this embodiment, before the welding of the splicing section 11 of the inclined column, the operation frame is set up according to the construction requirements, so as to facilitate the installation and welding of the splicing section 11 of the inclined column. When the shaped steel beam 2 and the reserved joint 12 of the inclined column are welded, the limit block is used to fix the shaped steel beam 2. After the welding is completed, it is transported to the site for installation. The bottom of the column is positioned with a limit plate, and finally the elevation is checked to ensure that the elevation and plane position are accurate. Temporary columns 3 are installed between the slabs to provide temporary support for the structure before the splicing section 12 of the inclined columns is constructed. A skylight made of transparent material 4 is provided between the fish-belly slanted columns on the roof for the natural lighting of the underground structure.

The construction method of the large-scale fish-belly oblique column structure in the underground space provided by the present invention overcomes the shortcomings of the narrow construction site, numerous surrounding buildings, and complex ground traffic composition, and has the advantages of high safety, short construction period, high construction efficiency, and good influence on the surrounding environment. Low impact and other advantages, suitable for today's engineering development in the downtown area of big cities with fierce competition and traffic congestion. In the present invention, the reserved joints of the slanted columns of each layer are reversed first, which reduces the horizontal deformation of the enclosure structure during the construction process, reduces the engineering quantity of temporary facilities, and reduces the impact on the surrounding environment; The operation interference in the assembly process is reduced, the working area is increased, and the construction efficiency is improved; the joints reserved for each layer of inclined columns and the splicing sections of each layer of inclined columns constitute the fish-belly multi-layer segmented inclined columns of the present invention, and the multi-layered inclined columns are divided into multiple layers. The segmented form facilitates construction and improves construction safety. The large-scale fish-belly oblique column structure in the underground space constructed by the construction method of the present invention has large underground use space, good natural lighting, and good application prospects.

The embodiments described above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications, and within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., should be included in the protection of the present invention. within range.

Claims (7)

1. A method for constructing a large-scale fish-belly inclined column structure in an underground space, characterized in that it comprises the following steps: 1) Construction preparation: According to the design size, the reserved joints of shaped steel beams and inclined columns are processed in the processing plant, and the reserved joints of inclined columns are connected with shaped steel beams as a whole; 2) Cushion and embedded parts construction: Excavate the earthwork in the cover plate area, and pour the cushion concrete immediately after the foundation pit of the cover plate is excavated and cleared the bottom; excavate under the inclined column as the "foundation" for erecting support , and then lay out wires and install embedded steel plates in the "foundation" as the erection support, connect the bottom of the steel plates with steel bars, and pour concrete; 3) Measurement and stakeout: model the reserved joints of shaped steel beams and slanted columns, calculate the coordinates of reserved joints for installation After the coordinates are consistent, it will be used as the basis for measuring and setting out; weld the positioning steel plate at the installation side line that pops up during the measurement, and then install the reserved joints of the inclined columns of each layer. After the installation is completed, measure the control points at the upper and lower ends of the reserved joints of the inclined columns, and make each layer accordingly Slanted column splicing section; 4) Hoisting of the reserved joints of shaped steel beams and inclined columns: install the reserved joints of inclined columns to the design position according to the stakeout position in step 3, after the reserved joints of inclined columns are installed, process the shaped steel beams according to the actual length of the site and install them ; 5) Positioning and strengthening of reserved joints of shaped steel beams and inclined columns: review and fine-tune the elevation of the top of shaped steel beams and the axis, verticality, and angle of reserved joints of inclined columns, and perform reinforcement measures after the above positioning is completed; Check the axes and elevations of the joints reserved for the shaped steel beams and inclined columns, and proceed to the next step only after they are correct; 6) Construction of the splicing section of the inclined column: After the construction of the above main structure is completed, the splicing section of the inclined column shall be constructed by the method of cover and excavation; the splicing section of the inclined column shall be hoisted and moved to the position of the splicing section, and the splicing of the inclined column shall be adjusted by using the reserved limit splint The section and the reserved joint of the inclined column are completely aligned, and the full penetration welding is performed after accurate positioning; The joints reserved for each layer of inclined columns and the spliced sections of each layer of inclined columns constitute a multi-layer segmented oblique column. The multi-layer segmented oblique column adopts the construction method of combining cover-excavation and cover-excavation: during construction, each layer is reversed first Joints are reserved for the slanted columns, and then the splicing sections of the slanted columns of each layer are made along the way; the multi-layer segmented slanted columns form a fish-belly symmetrical arrangement, which ensures the natural lighting of the underground space to the greatest extent. 2. A construction method for a large fish-bellied slanted column structure in an underground space according to claim 1, wherein temporary columns are installed between each layer to provide temporary support for the main structure before the construction of the slanted column splicing section. 3. According to claim 1, a construction method of a large-scale fish-belly inclined column structure in an underground space, characterized in that, in step 2) the earthwork excavation in the area of the cover plate is excavated for 4m, and the excavation reaches 2.2m below the roof. , the remaining layers are excavated to 2m from the bottom of the laminate; the foundation pit of the cover plate is excavated to 200mm close to the base. 4. According to claim 1, a construction method of a large fish-bellied slanted column structure in an underground space, characterized in that the "foundation" used as the erection support in step 2) is 3000mm*3000mm, the depth is 400mm, and the internal layout is Φ14 @200 steel mesh; 4 steel plates are pre-embedded on the top of the "foundation", and the size of the steel plates is 1000mm*600mm*16mm; at the same time, 600mm*600mm*16mm supporting steel plates are pre-embedded in the inclined direction of the inclined column and the direction of the steel beam. 5. According to claim 1, a construction method of a large-scale fish-belly slanted column structure in an underground space, characterized in that, after the fine-tuning in step 5), it is necessary to ensure that the steel beam top elevation deviation ± 2mm, and the slanted column reserve joints The axis deviation is less than 3mm, and the verticality of the reserved joint of the inclined column is less than 1mm. 6. According to claim 1, a construction method of a large-scale fish-bellied slanted column structure in an underground space, characterized in that, in step 6), the specific operation of hoisting the spliced section of the slanted column and moving it to the position of the spliced section is to use a shaped steel beam The two lifting points are set to pull the upper and lower ends of the splicing section of the slanting column horizontally. After moving to the position of the splicing section, the hook is slowly unloaded, and the upper and lower ends are tightened to pull the rope to make the splicing section of the slanting column in place. 7. According to claim 1, a construction method for a large-scale fish-belly slanted column structure in an underground space is characterized in that when the steel beam and the slanted column are welded at the reserved joint, a limit block is used to fix the steel beam, During installation, the reserved joints of the slanted columns and the sidelines of the steel beams are firstly positioned, and the bottom of the reserved joints of the slanted columns is positioned with a limit plate. Finally, the elevation needs to be checked to ensure that the elevation and plane position are correct.

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