Subway station transfer node cover excavation construction method

Abstract

The invention provides a subway station transfer node cover excavation construction method, and belongs to the technical field of underground engineering construction. Comprising the steps that an upper step soil body is excavated, radial anchor pipes between piles on the two sides are constructed, the upper step soil body is excavated, a part of a top plate and a middle concrete waist beam are constructed, steel supports are erected, the top plate is connected with reserved connection steel bars of an existing line, a lower step middle soil body is excavated to a base in a sloping mode, a middle bottom plate and frame columns are constructed, and two rows of reserved supporting piles in the middle are dismantled. Excavating the residual soil body of the lower step to a base; excavating and driving radial anchor pipes on two sides while excavating, and grouting; constructing bottom plates on two sides of the middle part; arranging temporary steel pipe piles, excavating the residual soil body, breaking support piles on two sides, erecting a steel frame for primary support, spraying and mixing, constructing the residual bottom plates and side walls, and breaking the residual reserved support piles; and part of bottom plate post-pouring holes and end side walls of the supporting piles are constructed, a shield is pushed in an empty mode to pass through, and an internal structure is constructed. The transfer node construction efficiency can be improved, and the construction difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground engineering construction, and more particularly to a subway station transfer node cover excavation construction method. BACKGROUND

[0002] At present, urban rail transit network construction has become the focus of many cities' traffic construction, and the basic feature of the network development of urban rail transit construction is to form more and more line network intersection transfer nodes. The transfer hub is set at the transfer node to enable passengers to quickly transfer from one line to another line. Node transfer refers to the transfer mode of two lines intersecting, which is opposite to parallel transfer. At the intersection of two lines, the structure of the overlapping part of the two lines is made into a whole to become a transfer node. Generally, the transfer node section is a large section of three layers underground, one layer underground is a station hall, and the second and third layers underground are platforms of two lines respectively.

[0003] In the prior art, for T-shaped transfer with an existing subway line, the station is formed into an underground three-layer island station, a three-span frame structure, two entrances and two groups of wind pavilions are arranged, the station is constructed by using the open excavation method (transfer node excavation), the maintenance structure adopts the form of bored pile + steel pipe support enclosure, the total length of the station is 180 meters, the width of the foundation pit of the standard section is 22.7 meters, and the buried depth of the bottom plate of the standard section is 24.84 meters. The width of the foundation pit of the shield end well section is 27.53 meters, the buried depth of the bottom plate of the shield well section is 26.39 meters, and the top plate of the standard section of the station is covered by 3.6 meters. The existing line is a two-layer underground station (the buried depth of the bottom plate is 17.44 meters), the newly-built line is located below the existing line and is a three-layer underground station, the newly-built line passes under the existing line at the transfer node by using the underground excavation method, and 5 rows of φ1200@4000 (in the middle) + 2 rows of 1200@4000 (on both sides) support piles are reserved under the bottom plate of the transfer node during the construction of the existing line. At present, the main body of the station of the newly-built line open excavation section is completely constructed, the main body of the negative one and negative two layers is connected with the main body of the existing line, the temporary φ800 steel pipe column of the negative three layer is erected, the enclosure pile is broken, and the south end of the station is completed. Based on the above construction conditions, the construction process or method of the transfer node in the prior art cannot meet the construction requirements, which will cause the delay of the construction progress, affect the construction quality, and reduce the construction efficiency. SUMMARY

[0004] The purpose of the present application is to provide a subway station transfer node cover excavation construction method, which aims to solve the technical problems that the construction process or method of the subway station transfer node in the prior art cannot meet the construction requirements, which will cause the delay of the construction progress, affect the construction quality, and reduce the construction efficiency.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is to provide a subway station transfer node cover excavation construction method, which comprises:

[0006] The transfer node is constructed by the method of underground excavation. Firstly, the soil on the upper step of the transfer node is excavated, and the radial anchor pipes between the two piles are constructed and grouted while excavating. The soil on the upper step is excavated to the end;

[0007] After the soil on the upper half of the transfer node is excavated, part of the roof and the middle concrete waist beam are constructed, and five steel supports are erected. The roof is connected with the reserved connecting steel bars of the existing line.

[0008] The soil in the middle of the lower step is excavated to the base by slope excavation, and then the middle bottom plate and frame column are constructed.

[0009] After the middle bottom plate and frame column reach the design strength, the two rows of reserved support piles in the middle are removed, and then the remaining soil in the lower step is excavated to the base. The radial anchor pipes are set on both sides while excavating and grouted.

[0010] The bottom plates on both sides of the middle are constructed, and then temporary steel pipe columns are arranged above and below the middle concrete waist beam.

[0011] The soil on the upper left, lower left, upper right and lower right of both sides is excavated in sequence. The support piles on both sides are removed as the soil is excavated, and steel frame primary support is erected and primary support shotcrete is performed as excavating.

[0012] The remaining bottom plates and side walls on both sides are constructed. The side walls are poured in three sections to the roof, and the top of the side wall is connected to the bottom plate of the existing line by planting steel bars.

[0013] The remaining three rows of reserved support piles are removed, and the post-pouring hole of the support pile part of the bottom plate and the end side wall are constructed.

[0014] The shield is pushed through, and the internal structure of the transfer node is constructed.

[0015] In one possible implementation, the overall excavation section shape of the transfer node is rectangular, with a length*width size of 26.5 meters*8.9 meters, and an excavation length of 22.7 meters.

[0016] In one possible implementation, the radial anchor pipe has a diameter of 42 mm, a length of 3.25 meters, a layout interval of 0.6*0.6 meters, a length of 3 meters, and is arranged in a plum blossom shape between and in the middle of the support piles.

[0017] In one possible implementation, the steel support has a diameter of 609 mm.

[0018] In one possible implementation, the five support piles in the middle have a diameter of 1200 mm, a layout interval of 4000 mm, and a length of 25 meters. The support piles in the side part have a diameter of 1000 mm, a layout interval of 1200 mm, and a length of 13 meters.

[0019] In a possible implementation, the temporary steel pipe pile has a diameter of 800 mm and a layout interval of 6.5 m.

[0020] In a possible implementation, the steel frame primary support is of type 350, has a layout interval of 0.5 m, and the thickness of the primary support sprayed concrete is 350 mm.

[0021] In a possible implementation, the subway station transfer node cover excavation construction method further comprises an anchor pipe construction device for construction of the radial anchor pipe, the anchor pipe construction device is used for drilling the radial anchor pipe towards the inside of the soil body, and the drilling depth and direction can be adjusted.

[0022] In a possible implementation, the subway station transfer node cover excavation construction method further comprises a mechanical arm for erecting the steel support, one end of the mechanical arm is detachably connected to the support pile, the other end is an execution end and has a moving degree of freedom towards different directions, and the execution end is used for clamping and carrying the steel support so as to erect the steel support between the two adjacent rows of support piles.

[0023] In a possible implementation, the subway station transfer node cover excavation construction method further comprises a remote controller in communication connection with the anchor pipe construction device and the mechanical arm respectively, and the remote controller has a control module for controlling the operation of the anchor pipe construction device and the mechanical arm respectively.

[0024] The subway station transfer node cover excavation construction method provided by the application has the beneficial effects that, compared with the prior art, the subway station transfer node cover excavation construction method comprises the following steps: the transfer node is constructed by using the underground excavation method, the upper step soil body of the transfer node is first excavated, the radial anchor pipes between the two side piles are constructed while the excavation is performed, and grouting treatment is performed, and the upper step soil body is excavated to the end; after the upper half of the soil body of the transfer node is excavated, part of the roof and the middle concrete waist beam are constructed, and five steel supports are erected, the roof is connected with the reserved connecting steel bars of the existing line; the middle part of the lower step soil body is excavated to the basement by slope excavation, and then the middle bottom plate and the frame column are constructed; after the middle bottom plate and the frame column reach the design strength, the two rows of reserved support piles in the middle are removed, and then the remaining soil body of the lower step is excavated to the basement, the radial anchor pipes are arranged on the two sides while the excavation is performed, and grouting is performed; the bottom plates on the two sides in the middle are constructed, and then temporary steel pipe columns are arranged above and below the middle concrete waist beam; the upper left, lower left, upper right and lower right parts of the soil body on the two sides are successively excavated, the support piles on the two sides are removed while the soil body is excavated, the steel frame primary supports are erected while the excavation is performed, and primary support sprayed concrete is performed; the remaining bottom plates and side walls on the two sides are constructed, the side walls are poured in three sections to the roof, and the top of the side wall is connected with the bottom plate of the existing line by using the dowel bar connection; the remaining three rows of reserved support piles are removed, the bottom plate of the support pile part, the post-pouring hole and the end side wall are constructed; the shield is pushed through, and the internal structure of the transfer node is constructed, and the application can improve the construction efficiency of the transfer node and reduce the technical effect of construction difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0026] Figure 1 An internal structure schematic diagram of a subway station transfer node provided by the subway station transfer node cover excavation construction method of the embodiment of the present application;

[0027] Figure 2 An upper step soil body excavation structure schematic diagram of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0028] Figure 3 A partial top plate and concrete waist beam construction structure schematic diagram of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0029] Figure 4 A steel support erection structure schematic diagram of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0030] Figure 5 A middle part soil body structure schematic diagram of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0031] Figure 6 A middle part bottom plate and frame column (the columnar hatched part in the figure) structure schematic diagram of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0032] Figure 7 A structure schematic diagram of removing two rows of reserved support piles (the hatched part in the figure) in the middle part of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0033] Figure 8 A remaining soil body (the hatched part in the figure) structure schematic diagram of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0034] Figure 9 A structure schematic diagram of making middle part two side bottom plates and installing two side temporary steel pipe columns (the hatched part in the figure) of the subway station transfer node cover excavation construction method provided by the embodiment of the present application;

[0035] Figure 10A structure diagram of sequentially expanding two side soil bodies of a subway station transfer node cover-excavation construction method provided by the embodiment of the present application is shown in the figure.

[0036] Figure 11 A structure diagram of constructing two side walls of a subway station transfer node cover-excavation construction method provided by the embodiment of the present application is shown in the figure.

[0037] Figure 12 A structure diagram of breaking remaining reserved support piles of a subway station transfer node cover-excavation construction method provided by the embodiment of the present application is shown in the figure.

[0038] Figure 13 A structure diagram of constructing a bottom plate post-cast hole and an end side wall of a subway station transfer node cover-excavation construction method provided by the embodiment of the present application is shown in the figure.

[0039] Explanation of reference signs:

[0040] 1, support pile; 2, radial anchor pipe; 3, top plate; 4, reserved connecting steel bar of existing line; 5, concrete waist beam; 6, steel support; 7, connecting beam; 8, plain pile; 9, temporary steel pipe column; 10, planted steel bar. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0042] Please refer to Figures 1 to 13The application provides a subway station transfer node cover excavation construction method, and relates to the field of subway station construction. The subway station transfer node cover excavation construction method comprises the following steps: the transfer node is constructed by using a cover excavation method, first, the upper step soil of the transfer node is excavated, the two side radial anchor pipes 2 are constructed while the soil is excavated, and grouting treatment is performed, and the upper step soil is excavated to the end; after the upper half of the soil of the transfer node is excavated, the partial top plate 3 and the middle concrete waist beam 5 are constructed, and five steel supports 6 are erected, the top plate 3 is connected with the reserved connecting steel bars 4 of the existing line; the middle part of the lower step soil is excavated to the base by slope excavation, and then the middle bottom plate and the frame column are constructed; after the middle bottom plate and the frame column reach the design strength, the two rows of reserved support piles 1 in the middle are removed, then the remaining soil of the lower step is excavated to the base, the two sides are provided with the radial anchor pipes 2 and the grouting is performed while the soil is excavated; the bottom plates on the two sides are constructed, then the temporary steel pipe columns 9 are arranged above and below the middle concrete waist beam 5; the upper left, lower left, upper right and lower right parts of the soil on the two sides are excavated in sequence, the support piles 1 on the two sides are removed while the soil is excavated, the steel frame primary support is erected while the soil is excavated, and the primary support is sprayed and mixed; the remaining bottom plates and the side walls on the two sides are constructed, the side walls are poured in three sections to the top plate 3, and the top of the side wall is connected with the bottom plate of the existing line by using the dowel bars 10; the remaining three rows of reserved support piles 1 are removed, the bottom plate of the support pile 1 part is constructed, and the end part of the side wall is constructed; the shield is pushed through, and the internal structure of the transfer node is constructed.

[0043] Compared with the prior art, the construction method of the subway station transfer node cover excavation construction method is different from the prior art, the construction environment (the positional relationship with the existing line), the overall construction process and the prior art are different, by using the construction method of the application, the construction efficiency of the transfer node can be improved, and the construction difficulty can be reduced.

[0044] Figure 2 The middle upper part of the support pile 1 is provided with a connecting beam 7, Figure 3 The outer side of the support pile 11 is provided with a concrete pile 8.

[0045] In some embodiments, referring to Figures 1 to 13 The overall excavation section shape of the transfer node is rectangular, the length*width size is 26.5 meters*8.9 meters, and the excavation length is 22.7 meters.

[0046] In some embodiments, referring to Figures 1 to 13 The diameter of the radial anchor pipe 2 is 42 mm, the length is 3.25 meters, the layout interval is 0.6*0.6 meters, the length is 3 meters, and the radial anchor pipe 2 is arranged between and in the middle of the support pile 1 in a plum blossom shape.

[0047] In some embodiments, referring to Figures 1 to 13 The diameter of the steel support 6 is 609 mm.

[0048] In some embodiments, please refer to Figures 1 to 13 , the five support piles 1 in the middle have a diameter of 1200mm, a layout interval of 4000mm, and a length of 25 meters; the support piles 1 in the side have a diameter of 1000mm, a layout interval of 1200mm, and a length of 13 meters.

[0049] In some embodiments, please refer to Figures 1 to 13 , the temporary steel pipe piles have a diameter of 800mm and a layout interval of 6.5 meters.

[0050] In some embodiments, please refer to Figures 1 to 13 , the initial support of the steel frame is of type 350, has a layout interval of 0.5 meters, and the sprayed thickness of the initial support is 350mm.

[0051] In order to facilitate the construction of the radial anchor pipe 2 and improve the construction efficiency, in some embodiments, please refer to Figures 1 to 13 , the cover excavation construction method for the transfer node of the subway station further comprises an anchor pipe construction device for the construction of the radial anchor pipe 2, the anchor pipe construction device is used for drilling the radial anchor pipe 2 towards the inside of the soil body, and the depth and direction of drilling can be adjusted. The anchor pipe construction device can be selected from the prior art devices, and can be conveniently moved to different positions for construction. After the radial anchor pipe 2 is placed on the anchor pipe construction device, the radial anchor pipe 2 can be once punched into the inside of the soil body by starting the anchor pipe construction device, and the direction and position of punching can be adjusted by the anchor pipe construction device.

[0052] In order to improve the erection efficiency of the steel support 6, in some embodiments, please refer to Figures 1 to 13 , the cover excavation construction method for the transfer node of the subway station further comprises a mechanical arm for erecting the steel support 6, one end of the mechanical arm is detachably connected to the support pile 1, the other end is an execution end and has a moving degree of freedom towards different directions, and the execution end is used for clamping and carrying the steel support 6 so as to erect the steel support 6 between the two adjacent rows of support piles 1. The mechanical arm in the present application adopts the mechanical arm or manipulator with six degrees of freedom in the prior art, one end of which is connected to the support pile 1, and the other end can clamp the steel support 6 and move or carry it to the installation position, so as to fix the steel support 6.

[0053] In order to control the anchor pipe construction device and the mechanical arm, facilitate smooth operation and completion of the operation, in some embodiments, please refer to Figures 1 to 13 , the cover excavation construction method for the transfer node of the subway station further comprises a remote controller in communication connection with the anchor pipe construction device and the mechanical arm, respectively, and the remote controller has a control module for controlling the operation of the anchor pipe construction device and the mechanical arm, respectively. The anchor pipe construction device and the mechanical arm can be products in the prior art, and through the connection with the remote controller, such as electrical connection or wireless communication connection, the operation of the anchor pipe construction device and the mechanical arm can be controlled.

[0054] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for cover-and-excavation construction of a transfer node at a subway station, characterized in that: The following steps are involved: The transfer node is constructed using the hidden excavation method. First, the soil of the upper step of the transfer node is excavated. As the excavation progresses, radial anchor pipes are installed between the piles on both sides, and grouting is performed. The soil of the upper step is excavated to the end. After excavating the upper part of the transfer node, a partial top plate and a middle concrete waist beam were constructed, and five steel supports were erected. The top plate was connected to the reserved connecting steel bars of the existing line; Slope excavation is carried out to excavate the soil in the middle of the lower step to the base, and then the middle bottom plate and frame columns are constructed; After the middle floor and frame columns reach the designed strength, the two rows of reserved support piles in the middle are removed, and then the remaining soil of the lower step is excavated to the base. Radial anchor pipes are driven and grouting is carried out on both sides as the excavation progresses. Construct the bottom plates on both sides of the middle part, and then set up temporary steel pipe columns above and below the middle concrete waist beam; Excavate the soil on the upper left, lower left, upper right, and lower right sides in sequence, remove the supporting piles on both sides as the soil is excavated, and erect the initial support steel frame and conduct the initial support spraying and mixing as the soil is excavated; The remaining bottom plates and side walls on both sides of the construction were cast in three sections up to the top plate, and the top of the side wall was connected to the existing line bottom plate by planting reinforcement; Remove the remaining three rows of reserved support piles and construct the post-cast holes and end side walls of the support pile bottom plate; The shield tunnel is pushed through to construct the internal structure of the transfer node.

2. The method for cover-and-cut construction of a subway station transfer node according to claim 1, characterized in that: The overall excavation section of the transfer node is rectangular, with a length and width of 26.5 meters and 8.9 meters, and an excavation length of 22.7 meters.

3. The method for excavating and covering a subway station transfer node according to claim 1, wherein: The radial anchor pipe has a diameter of 42 mm and a length of 3.25 meters, a layout spacing of 0.6*0.6 meters, a plum blossom shape arrangement, a length of 3 meters, and is laid between the support piles and in the middle of the support piles.

4. The method for constructing a subway station transfer node by covering and excavating as claimed in claim 1, characterized in that: The steel support has a diameter of 609 mm.

5. The method for constructing a subway station transfer node by covering and excavating as claimed in claim 1, characterized in that: The five support piles in the middle have a diameter of 1200 mm, a spacing of 4000 mm, and a length of 25 meters; the support piles on the sides have a diameter of 1000 mm, a spacing of 1200 mm, and a length of 13 meters.

6. The method for constructing a subway station transfer node by excavating and covering as claimed in claim 1, characterized in that: The temporary steel pipe piles have a diameter of 800 mm and are arranged at a spacing of 6.5 meters.

7. The method for constructing a subway station transfer node by excavation and covering according to claim 1, characterized in that: The initial support of the steel frame is type 350, the layout spacing is 0.5 meters, and the thickness of the initial support spray mix is ​​350mm.

8. The method for excavating and covering a subway station transfer node according to claim 1, characterized in that: The cover-and-cut construction method for a transfer node of a subway station also includes an anchor pipe construction device for constructing radial anchor pipes. The anchor pipe construction device is used to drill the radial anchor pipes into the soil, and the drilling depth and direction are adjustable.

9. The method for excavating and covering a subway station transfer node according to claim 8, characterized in that: The cover-and-cut construction method for subway station transfer nodes also includes a robotic arm for erecting steel supports, one end of the robotic arm being detachably connected to the support piles, and the other end being an execution end having the freedom to move in different directions, and the execution end being used to clamp and carry the steel supports so that the steel supports are erected between two adjacent rows of support piles.

10. The method for cover-and-cut construction of a transfer node at a subway station according to claim 9, characterized in that: The cover-and-cut construction method for transfer nodes of subway stations also includes a remote controller that is communicatively connected to the anchor pipe construction device and the robotic arm, respectively. The remote controller has a control module for controlling the operation of the anchor pipe construction device and the robotic arm, respectively.

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