Safety structure and construction method of light roadbed built behind subway

Abstract

This invention provides a safety structure and construction method for a lightweight roadbed built above a subway line, comprising: an auxiliary component perpendicular to the ground, with its lower end extending below the bottom of the subway tunnel structure and equidistantly distributed on both sides of the subway tunnel; a protective component parallel to the ground, located above the lining structure of the subway tunnel; and a support component for connecting the protective component and the auxiliary component; the protective component is lower than the upper end of the auxiliary component. By employing the protective component, settlement of the subsequently built roadbed is avoided, and the load is transferred to the lower end and outer perimeter of the subway tunnel through the vertical and inclined concrete columns in the protective component, reducing the load above and ensuring the safety of the subway operation. Furthermore, the support and auxiliary components facilitate protection during roadbed construction, improving construction safety.

Description

Technical Field

[0001] This invention relates to a safety structure for a lightweight roadbed built on top of a subway, and specifically to the safety structure and construction method of a lightweight roadbed built on top of a subway. Background Technology

[0002] With the development of urbanization, urban rail transit has developed rapidly. In order to save ground land, underground rail transit, namely subway, is now widely used in urban rail transit. When the subway is in operation, it is becoming increasingly common for the subway line to be parallel to the municipal road above the subway. When building roads above the subway, safety protection is required to ensure the safety of subway operation, and then lightweight foundation construction is carried out.

[0003] For example, CN113005838A discloses a special subgrade structure above a subway and its construction method, which includes a lightweight foamed concrete subgrade laid between the road surface and the subgrade above the subway tunnel. The top of the lightweight foamed concrete subgrade is covered with a road structure layer. Concrete retaining walls are set on both sides of the lightweight foamed concrete subgrade, and earth-filled slopes are set on the outer side of the concrete retaining walls. Piles are set at the bottom of the lightweight foamed concrete subgrade and the earth-filled slopes on both sides. The use of foamed concrete reduces the weight of the embankment structure to avoid foundation settlement under excessive load, thus improving stability. By adjusting the pile type and embedding method and strengthening the application of frame pile beams, a stable connection is made between the lightweight foamed concrete subgrade and the foundation with different geological conditions, thereby effectively reducing differential settlement of the subgrade and ensuring the safe operation of the subway.

[0004] For example, CN112301820A discloses a construction process for lightweight foamed concrete subgrade above a subway tunnel, comprising the following steps: S1: excavating the subgrade and pre-setting the filling area; S2: cleaning and leveling the base of the filling area; S3: laying graded crushed stone; S4: erecting formwork and dividing the space into sections; S5: pouring the first layer of foamed concrete; S6: laying steel mesh; S7: pouring the next layer of foamed concrete; S8: laying the next layer of steel mesh; S9: pouring the last layer of foamed concrete; S10: water curing. This construction process ensures that the additional stress generated by the subgrade filling on the operating subway shield tunnel is less than the value required by the rail department, improving the safety of subgrade construction above the operating subway shield tunnel. Compared with traditional lime-soil subgrade construction, it greatly shortens the construction cycle and reduces the additional stress generated by the subgrade filling on the operating subway shield tunnel.

[0005] However, no safety protection structures were used to protect the subway tunnels during construction. Over time, due to increased loads and roadbed settlement, the load on the subway tunnels became excessive, affecting the safety of subway operation and posing a risk. Summary of the Invention

[0006] The purpose of this invention is to provide a safe structure and construction method for a lightweight roadbed built above a subway to solve the problems in the background art. During operation, the safe structure distributes the load of the lightweight roadbed to the lower end and outer perimeter of the subway tunnel, reducing the load above the subway tunnel and ensuring the safety of subway operation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] The safety structure for a lightweight roadbed built above the subway includes:

[0009] Auxiliary components, perpendicular to the ground, extend to the bottom of the subway tunnel structure and are equidistantly distributed on both sides of the subway tunnel.

[0010] Protective components, parallel to the ground, are located above the lining structure of the subway tunnel; and

[0011] A support assembly for connecting the protective assembly and the auxiliary assembly;

[0012] The protective component is located below the upper end of the auxiliary component.

[0013] Furthermore, the protective assembly consists of several crossbeams and longitudinal beams, which are directly filled with lightweight foamed concrete.

[0014] Furthermore, the crossbeam is perpendicular to the longitudinal beam, and an intermediate beam is provided between the longitudinal beams. A concrete vertical column extends downward from the intersection of the crossbeam and the intermediate beam.

[0015] Furthermore, the support assembly includes:

[0016] Precast support columns are symmetrically arranged along the axis of the subway tunnel.

[0017] Support plates are installed between the precast support columns on one side of the subway tunnel axis.

[0018] The prefabricated support column is fixedly connected at both ends to the auxiliary component and the protective component, respectively.

[0019] Furthermore, a V-shaped notch is provided on the outer wall of the precast support column, and a first connecting hole and a second connecting hole are provided on both sides of the notch; connecting claws are fixedly installed at the upper and lower ends of both sides of the support plate, and a connecting plate is fixedly installed at the middle end; the connecting claws are fixedly connected to the precast support column, and the connecting plate is fixedly connected to the first connecting hole.

[0020] Furthermore, the auxiliary component includes:

[0021] Precast auxiliary columns, perpendicular to the ground, extend their lower ends to the lower end of the subway tunnel structure's bottom. Tie plates connect the precast auxiliary columns and the precast support columns at both ends, respectively.

[0022] Several tie rods are parallel to the tie plate, and their two ends are respectively connected to the prefabricated auxiliary column and the prefabricated support column;

[0023] The prefabricated auxiliary column has screw holes on its outer wall for connecting one end of the tie rod.

[0024] Furthermore, the other end of the tie rod is inserted into the second connecting hole, and the longitudinal beam and the precast auxiliary column are fixedly connected by a concrete inclined column.

[0025] Furthermore, the end of the concrete inclined column near the longitudinal beam is higher than the end near the precast auxiliary column.

[0026] The construction method for a safe structure for a lightweight roadbed built above a subway station includes the following steps:

[0027] First, the prefabricated support columns and the prefabricated auxiliary columns are prefabricated.

[0028] Drilling is carried out according to the needs of roadbed construction. The holes include a first vertical hole and a first inclined hole. The prefabricated auxiliary column is inserted into the first vertical hole, and the prefabricated support column is inserted into the first inclined hole. The upper ends of the prefabricated support column and the prefabricated auxiliary column are fixedly connected by the tie plate.

[0029] The roadbed between the precast support columns is excavated, and when the gap is reached, the tie rod is passed through the second connecting hole and extended to the bolt hole for connection and fixation at both ends;

[0030] While excavating the roadbed, the support plates are installed simultaneously according to the excavation depth; after excavating to the planned depth, vertical and inclined holes are made to form a second vertical hole and a second inclined hole. The second vertical hole is located between the subway tunnels, and the second inclined hole extends from the longitudinal beam to the position of the precast auxiliary column.

[0031] The second vertical hole and the second inclined hole are poured to form the concrete vertical column and the concrete inclined column, and the lower end of the concrete inclined column is poured together with the precast auxiliary column.

[0032] The crossbeams, longitudinal beams, and intermediate beams are formed by pouring reinforced concrete, and are respectively connected and fixed to the precast support columns, concrete vertical columns, and concrete inclined columns. Lightweight foamed concrete is then poured to complete the construction of the safety structure, followed by the construction of the lightweight roadbed.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] By employing protective components, settlement of the subsequently constructed roadbed is prevented. The load is transferred to the lower end and outer perimeter of the subway tunnel through the concrete vertical and inclined columns in the protective components, reducing the load above and ensuring the safety of the subway operation. Furthermore, the support and auxiliary components facilitate protection during roadbed construction, improving the safety of construction.

[0035] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Attached Figure Description

[0036] Figure 1 This is an isometric drawing of the safety structure of the lightweight roadbed built above the subway in this invention.

[0037] Figure 2 This is a detailed drawing of the prefabricated auxiliary column and prefabricated support column of the present invention.

[0038] Figure 3 This is a schematic diagram of the support plate structure of the present invention.

[0039] Figure 4 This is a front view of the safety structure of the lightweight roadbed built above the subway in this invention.

[0040] Figure 5 This is a top view of the safety structure of the lightweight roadbed built above the subway in this invention.

[0041] Figure 6 This is a flowchart of the construction method of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Support assembly; 101. Precast support column; 102. Support plate; 103. Notch; 104. First connecting hole; 105. Second connecting hole; 106. Connecting claw; 107. Connecting plate;

[0044] 2. Auxiliary components; 201. Precast auxiliary column; 202. Tie plate; 203. Screw hole; 204. Tie rod;

[0045] 3. Protective components; 301. Horizontal beams; 302. Longitudinal beams; 303. Intermediate beams; 304. Lightweight foamed concrete; 305. Vertical concrete columns; 306. Inclined concrete columns;

[0046] 4. Subway tunnels. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] 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. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] Spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “on the left,” “left side,” “on the right,” and “on the right side” are used herein for convenience of description to describe the relationship between one component or feature shown in the figure and other components or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of components in use and operation. For example, if a component in the figure is flipped, then a component or feature described as “below,” “under,” or “below” other components or features would be oriented “above” other components or features. Thus, the exemplary terms “below” and “under” can include both upper and lower orientations. “On the left” and “on the left” can include both left and right orientations.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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.

[0051] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] Please see Figure 1-5 The safety structure for a lightweight roadbed built above the subway includes:

[0053] Auxiliary component 2 is perpendicular to the ground, with its lower end extending to the bottom of the subway tunnel structure and evenly distributed on both sides of the subway tunnel.

[0054] Protective component 3, parallel to the ground, is located above the lining structure of subway tunnel 4; and

[0055] Support component 1 is used to connect protective component 3 and auxiliary component 2; protective component 3 is lower than the upper end of auxiliary component 2. Support component 1 consists of two sets, forming a V-shaped structure.

[0056] The support component 1 and auxiliary component 2 facilitate protection during the later construction of the lightweight roadbed, preventing landslides and improving safety. During use, the protection component 3 prevents settlement of the lightweight roadbed and transfers the load to the area below and around the subway tunnel, reducing the load on the subway tunnel and improving its safety during operation.

[0057] Specifically, the protective component 3 consists of several crossbeams 301 and longitudinal beams 302, with the crossbeams 301 and longitudinal beams 302 directly filled with lightweight foamed concrete 304.

[0058] In this embodiment, the crossbeam 301 is perpendicular to the longitudinal beams 302, and an intermediate beam 303 is provided between several longitudinal beams 302. A concrete vertical column 305 extends downward from the intersection of the crossbeam 301 and the intermediate beam 303. The crossbeam 301, longitudinal beams 302 and intermediate beam 303 are all made of reinforced concrete.

[0059] Support component 1 includes:

[0060] Precast support columns 101 are symmetrically arranged along the subway tunnel axis.

[0061] The support plate 102 is installed between the precast support columns 101 on one side of the subway tunnel axis. Installing the support plate 102 can improve the safety during construction, prevent landslides, and, together with the auxiliary component 2, improve the stability and support effect of the support component 1 during use.

[0062] The two ends of the precast support column 101 are fixedly connected to the auxiliary component 2 and the protective component 3, respectively.

[0063] The precast support column 101 has a V-shaped notch 103 on its outer wall, and a first connecting hole 104 and a second connecting hole 105 are provided on both sides of the notch 103; the upper and lower ends of both sides of the support plate 102 are fixedly installed with connecting claws 106, and the middle end is fixedly installed with a connecting plate 107; the connecting claws 106 are fixedly connected to the precast support column 101, and the connecting plate 107 is fixedly connected to the first connecting hole 104.

[0064] Auxiliary component 2 includes:

[0065] Precast auxiliary column 201, perpendicular to the ground, extends its lower end to the lower end of the subway tunnel structure.

[0066] The tie plate 202 is connected at both ends to the precast auxiliary column 201 and the precast support column 101, respectively.

[0067] Several tie rods 204 are parallel to the tie plate 202, and their two ends are respectively connected to the precast auxiliary column 201 and the precast support column 101;

[0068] The prefabricated auxiliary column 201 has a screw hole 203 on its outer wall for connecting one end of the tie rod 204.

[0069] Specifically, the other end of the tie rod 204 is inserted into the second connecting hole 105, and the longitudinal beam 302 and the precast auxiliary column 201 are fixedly connected by a concrete inclined column 306. The lower end of the protective component 3 is cast and connected to the lower end of the precast auxiliary column 201. During construction, this facilitates the tensioning of the support component 1, improves the protective effect of the support component 1 during use, and facilitates the transfer of the load to the area below the subway tunnel after construction, making it convenient to use.

[0070] The end of the concrete inclined column 306 near the longitudinal beam 302 is higher than the end near the precast auxiliary column 201.

[0071] The subway tunnel 4 is located between the concrete vertical column 305 and the concrete inclined column 306. The crossbeam 301, longitudinal beam 302, intermediate beam 303 and lightweight foamed concrete 304 can prevent the roadbed from settling during later use. When distributing the load, the force is transferred to the concrete vertical column 305 and the concrete inclined column 306, thereby transferring the load to the lower part and the outer perimeter of the subway tunnel 4, which helps to improve the safety of subway operation.

[0072] Figure 6 A schematic flowchart illustrating the construction method of a safety structure for a lightweight roadbed built above a subway station according to the present invention is shown.

[0073] like Figure 6 As shown, the construction method for a safe structure for a lightweight roadbed built above a subway station includes the following steps:

[0074] Step S1: First, prefabricate the precast support column 101 and the precast auxiliary column 201;

[0075] Step S2: Drill holes according to the roadbed construction requirements. The holes include a first vertical hole and a first inclined hole. Insert the precast auxiliary column 201 into the first vertical hole and insert the precast support column 101 into the first inclined hole. Then, fix the upper ends of the precast support column 101 and the precast auxiliary column 201 together with the tie plate 202.

[0076] Step S3: Excavate the roadbed between the precast support columns 101, and when the gap 103 is reached, pass the tie rod 204 through the second connecting hole 105 and extend it to the bolt hole 203 for connection and fixation at both ends.

[0077] Step S4: While excavating the roadbed, install the support plate 102 simultaneously according to the excavation depth; after excavating to the planned depth, make vertical and inclined holes to form a second vertical hole and a second inclined hole. The second vertical hole is located between the subway tunnels, and the second inclined hole extends from the longitudinal beam 302 to the position of the precast auxiliary column 201.

[0078] Step S5: The second vertical hole and the second inclined hole are poured to form a concrete vertical column 305 and a concrete inclined column 306, and the lower end of the concrete inclined column 306 is poured together with the precast auxiliary column 201.

[0079] Step S6: Pour reinforced concrete to form crossbeams 301, longitudinal beams 302 and intermediate beams 303, and connect and fix them to precast support columns 101, concrete vertical columns 305 and concrete inclined columns 306 respectively. Then pour lightweight foamed concrete 304 to complete the construction of the safety structure, and then carry out the construction of the lightweight roadbed.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A safety structure for a lightweight roadbed built above a subway station, characterized in that: include: Auxiliary components, perpendicular to the ground, extend to the bottom of the subway tunnel structure and are equidistantly distributed on both sides of the subway tunnel. The protective components are parallel to the ground and located above the lining structure of the subway tunnel; as well as A support assembly for connecting the protective assembly and the auxiliary assembly; The protective component is lower than the upper end of the auxiliary component; The support components include: Precast support columns are symmetrically arranged along the axis of the subway tunnel. Support plates are installed between the precast support columns on one side of the subway tunnel axis. The prefabricated support column is fixedly connected to the auxiliary component and the protective component at both ends, respectively.

2. The safety structure for a lightweight roadbed built above a subway station according to claim 1, characterized in that, The protective assembly consists of several crossbeams and longitudinal beams, which are directly filled with lightweight foamed concrete.

3. The safety structure for a lightweight roadbed built above a subway station according to claim 2, characterized in that, The crossbeam is perpendicular to the longitudinal beam, and an intermediate beam is provided between several longitudinal beams. A concrete vertical column extends downward from the intersection of the crossbeam and the intermediate beam.

4. The safety structure for a lightweight roadbed built above a subway station according to claim 3, characterized in that, The precast support column has a V-shaped notch on its outer wall, and a first connecting hole and a second connecting hole are provided on both sides of the notch; the upper and lower ends of both sides of the support plate are fixedly installed with connecting claws, and the middle end is fixedly installed with a connecting plate; the connecting claws are fixedly connected to the precast support column, and the connecting plate is fixedly connected to the first connecting hole.

5. The safety structure for a lightweight roadbed built above a subway station according to claim 4, characterized in that, The auxiliary components include: Precast auxiliary columns, perpendicular to the ground, extend from their lower ends to the lower end of the subway tunnel structure. A tie plate, with its two ends connected to the precast auxiliary column and the precast support column respectively, and Several tie rods, parallel to the tie plate, are connected at both ends to the prefabricated auxiliary column and the prefabricated support column, respectively; The prefabricated auxiliary column has screw holes on its outer wall for connecting one end of the tie rod.

6. The safety structure for a lightweight roadbed built above a subway station according to claim 5, characterized in that, The other end of the tie rod is inserted into the second connection hole, and the longitudinal beam and the precast auxiliary column are fixedly connected by a concrete inclined column.

7. The safety structure for a lightweight roadbed built above a subway station according to claim 6, characterized in that, The end of the concrete inclined column near the longitudinal beam is higher than the end near the precast auxiliary column.

8. The construction method for a safety structure for a lightweight roadbed built above a subway station according to any one of claims 1-7, characterized in that, Includes the following steps: First, the prefabricated support columns and prefabricated auxiliary columns are prefabricated. Drilling is carried out according to the needs of roadbed construction. The holes include a first vertical hole and a first inclined hole. The prefabricated auxiliary column is inserted into the first vertical hole, and the prefabricated support column is inserted into the first inclined hole. The upper ends of the prefabricated support column and the prefabricated auxiliary column are fixedly connected by a tie plate. The roadbed between the precast support columns is excavated, and when the gap is reached, the tie rod is passed through the second connecting hole and extended to the bolt hole for connection and fixation at both ends; While excavating the roadbed, support plates are installed simultaneously according to the excavation depth; after excavating to the planned depth, vertical and inclined holes are made to form a second vertical hole and a second inclined hole. The second vertical hole is located between the subway tunnels, and the second inclined hole extends from the longitudinal beam to the location of the precast auxiliary column. The second vertical hole and the second inclined hole are poured to form a concrete vertical column and a concrete inclined column, and the lower end of the concrete inclined column is poured together with the precast auxiliary column; reinforced concrete is poured to form a horizontal beam, a longitudinal beam and an intermediate beam, which are respectively connected and fixed to the precast support column, the concrete vertical column and the concrete inclined column, and lightweight foamed concrete is poured to complete the construction of the safety structure, and then the lightweight roadbed construction is carried out.

Images