Subway station reverse construction self-adaptive inclined strut supporting device and construction method thereof

Abstract

The invention relates to a subway station reverse construction self-adaptive inclined strut supporting device and a construction method thereof.The self-adaptive inclined strut supporting device comprises an assembly type self-adaptive inclined strut, the assembly type self-adaptive inclined strut comprises an inclined strut outer steel pipe, an inclined strut inner steel pipe, an axial force servo control system, a warning lamp and an inclined strut connecting end, and the inclined strut inner steel pipe is fixedly connected into the inclined strut outer steel pipe in a sleeved mode; the top of the inclined strut inner steel pipe penetrates out of the inclined strut outer steel pipe, one inclined strut connecting end is fixedly connected to the bottom of the inclined strut outer steel pipe, the other inclined strut connecting end is fixedly connected to the fixed end of the axial force servo control system, the movable end of the axial force servo control system is fixedly connected with the top of the inclined strut inner steel pipe through a flange, and the warning lamp is installed on the outer wall of the inclined strut outer steel pipe. Traditional steel supports are replaced by the assembly type self-adaptive inclined struts, the self weight and the transportation cost of the supporting device are remarkably reduced, the requirement for construction operation space is remarkably reduced, and the assembly type self-adaptive supporting device has the advantages of being high in construction efficiency, low in cost, good in safety and the like.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support for subway stations, and in particular to a self-adaptive diagonal bracing support device for reverse construction of subway stations and a construction method thereof. Background Art

[0002] Steel supports and concrete supports can be seen everywhere in the construction process of subway station foundation pits. Steel support technology has excellent bearing capacity and a relatively short construction period, and is widely used in the internal support of the foundation pit support of subway stations in the reverse construction method.

[0003] However, the traditional steel support technology has significant limitations in practical applications. The existing steel support is usually made of heavy steel and needs to span the entire foundation pit. It is heavy in weight, requires a large construction space, and increases transportation and construction costs. Especially for some large stations or special stations, the existing traditional steel support requires a longer length, which is particularly inconvenient and costly to construct. In addition, the existing support system mostly adopts a static design, does not fully consider real-time monitoring and adjustment, lacks a dynamic response mechanism, and may lead to safety hazards. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and provides an adaptive diagonal bracing support device for reverse construction of a subway station and a construction method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An adaptive diagonal bracing support device for reverse construction of a subway station, comprising:

[0007] The assembled adaptive diagonal brace comprises an outer steel pipe of the diagonal brace, an inner steel pipe of the diagonal brace, an axial force servo control system, a warning light, and an end connection of the diagonal brace. The inner steel pipe of the diagonal brace is sleeved and fixedly connected to the inner steel pipe of the diagonal brace, and the top of the inner steel pipe of the diagonal brace passes through the outer steel pipe of the diagonal brace. One end connection of the diagonal brace is fixedly connected to the bottom of the outer steel pipe of the diagonal brace, and the other end connection of the diagonal brace is fixedly connected to the fixed end of the axial force servo control system. The movable end of the axial force servo control system is fixedly connected to the top of the inner steel pipe of the diagonal brace through a flange. The warning light is installed on the outer wall of the outer steel pipe of the diagonal brace. A plurality of pairs of embedded components are correspondingly provided at the bottom of the middle plate of the station and the bottom of the inner wall of the ground-connected wall. The two end connection of the assembled adaptive diagonal brace can be detachably installed between a pair of embedded components respectively.

[0008] The intelligent monitoring and control system includes a monitoring and control center and a sensor integration module. The sensor integration module is installed at the bottom of the outer wall of the inner steel pipe of the diagonal brace, and the sensor integration module is located inside the outer steel pipe of the diagonal brace. The sensor integration module, the axial force servo control system, and the warning light are respectively connected to the monitoring and control center.

[0009] In particular, a plurality of bolt connection holes are provided on the connecting end of the diagonal brace.

[0010] In particular, the embedded components include a base plate, reinforcing steel bars, and a connecting plate. Several reinforcing steel bars are fixed to the back of the base plate, and several connecting plates are fixed to the front of the base plate. The base plate and the reinforcing steel bars are embedded in the station center plate and the ground-connected wall. The connecting plate is provided with several through holes corresponding to the bolt connection holes. The connecting plate and the diagonal brace connecting end are fixed by bolts passing through the through holes and the bolt connection holes and tightening the nuts.

[0011] In particular, the sensor integration module includes a strain gauge, a ballast sensor, a displacement sensor, an inclinometer, and an accelerometer.

[0012] In particular, an inspection port corresponding to the sensor integrated module is provided on the outer steel pipe of the diagonal support, and a sealing cover is installed on the inspection port.

[0013] In particular, the axial force servo control system is an electro-hydraulic jack.

[0014] A construction method of an adaptive diagonal bracing support device for reverse construction of a subway station comprises the following steps:

[0015] S1. Use double-wheel milling to construct guide walls and ground-connected walls in sections; use the ground-connected walls as the side walls of the station, and retain them as permanent structures in the future;

[0016] S2. While constructing the ground-connected wall, use a pile driver to construct the king column within the station area, and the king column will be retained as a permanent column;

[0017] S3. Excavate to the bottom of the station roof, remove the floating mud on the top of the ground-connected wall, and then cast the station roof. Several first openings are reserved on the station roof;

[0018] S4. Excavate to the station hall level, pour the station middle slab concrete, and place the embedded components on the lower side around the bottom of the station middle slab. Several second openings are reserved on the station middle slab;

[0019] S5. Continue excavating to the bottom of the assembled adaptive diagonal brace, and mark and install the embedded components and brackets at the corresponding positions of the ground-connected wall;

[0020] S6. Install the assembled adaptive diagonal braces. Use high-strength bolts to connect the diagonal brace connection ends at both ends of the assembled adaptive diagonal braces to the embedded components. Evenly arrange them around the station on the lower side of the station middle plate.

[0021] S7. The axial force servo control system, sensor integrated module and warning light on the assembled adaptive diagonal brace are connected to the monitoring and control center. During the subsequent construction process, the monitoring and control center receives information from the sensor integrated module, continuously monitors the stress and displacement signals of the assembled adaptive diagonal brace, ensures the construction effect and safety, and controls the axial force servo control system to make corresponding adjustments as needed. The monitoring and control center adjusts the color of the warning light according to the abnormal situation. The safety warning light is displayed as green light, the abnormality is displayed as yellow light within a certain range, and the emergency is displayed as a red flashing light and the abnormal situation position is broadcast in the monitoring and control center.

[0022] S8, excavate to the bottom of the pit and cast the bottom slab;

[0023] S9. Remove the prefabricated adaptive diagonal brace in preparation for next use and carry out construction in the equipment room inside the station.

[0024] The beneficial effects of the present invention are as follows: the present invention replaces the traditional steel support internal support form with an assembled adaptive diagonal brace support device, and the size and weight of the adaptive diagonal brace are greatly improved compared with the traditional steel support, which solves the problem that the traditional steel support has a large length and weight across the foundation pit and is inconvenient to construct. The adaptive diagonal brace requires a small space, which greatly increases the construction space. Combined with the intelligent monitoring and control system, it solves the problem that the traditional steel support does not fully consider real-time monitoring and adjustment and lacks a dynamic response mechanism. At the same time, the construction method of the present invention uses the ground-connected wall as the side wall of the main structure of the subway station, which also greatly reduces the construction period pressure and cost issues. The present invention has the advantages of high construction efficiency, low cost and reusability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the assembled adaptive diagonal brace structure of the present invention;

[0026] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0027] Figure 3 It is a schematic diagram of the installation position of the assembled adaptive diagonal bracing structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the position of the embedded components of the present invention;

[0029] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0030] Figure 6 This is a schematic diagram of the construction of the ground-connected wall of the present invention;

[0031] Figure 7 This is a schematic diagram of the construction of the king column of the present invention;

[0032] Figure 8 It is a schematic diagram of the positions of the ground-connected wall and the king pillars of the present invention;

[0033] Fig. 9 A schematic diagram of the positions of the first hole and the second hole of the present invention;

[0034] In the figure: 1-assembled adaptive diagonal brace; 101-diagonal brace outer steel pipe; 102-diagonal brace inner steel pipe; 103-axial force servo control system; 104-warning light; 105-diagonal brace connection end; 106-bolt connection hole; 2-station top plate; 3-station middle plate; 4-ground connection wall; 5-embedded components; 501-pad; 502-reinforced steel bars; 503-connecting plate; 6-monitoring control center; 7-sensor integrated module; 8-inspection port; 9-cover; 10-double-wheel milling; 11-pile driver; 12-king column; 13-first hole; 14-second hole;

[0035] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with embodiments:

[0037] like Figure 1-Figure 9 As shown, an adaptive diagonal bracing support device for reverse construction of a subway station comprises:

[0038] The assembled adaptive diagonal brace 1 comprises an outer diagonal brace steel tube 101, an inner diagonal brace steel tube 102, an axial force servo control system 103, a warning light 104 and a diagonal brace connecting end 105. The inner diagonal brace steel tube 102 is sleeved and fixedly connected inside the outer diagonal brace steel tube 101, and the top of the inner diagonal brace steel tube 102 passes through the outer diagonal brace steel tube 101. One diagonal brace connecting end 105 is fixedly connected to the bottom of the outer diagonal brace steel tube 101, and the other diagonal brace connecting end 105 is fixedly connected to the fixed end of the axial force servo control system 103. The movable end of the axial force servo control system 103 is fixedly connected to the top of the inner diagonal brace steel tube 102 through a flange. The warning light 104 is installed on the outer wall of the outer diagonal brace steel tube 101, and the bottom of the station middle plate 3 and the bottom of the inner wall of the ground-connected wall 4 are provided with corresponding A plurality of pairs of embedded components 5, two diagonal brace connection ends 105 of the assembled adaptive diagonal brace 1 are respectively detachably installed between a pair of embedded components 5; a plurality of bolt connection holes 106 are arranged on the diagonal brace connection end 105, the embedded component 5 comprises a pad 501, a reinforcing steel bar 502, and a connecting plate 503, a plurality of reinforcing steel bars 502 are fixedly connected to the back of the pad 501, a plurality of connecting plates 503 are fixedly connected to the front of the pad 501, the pad 501 and the reinforcing steel bars 502 are embedded in the station middle plate 3 and the ground connection wall 4, a plurality of through holes corresponding to the bolt connection holes 106 are arranged on the connecting plate 503, and the connecting plate 503 and the diagonal brace connection end 105 are fixed by bolts passing through the through holes and the bolt connection holes 106 and tightening the nuts. The diagonal brace outer steel pipe 101 and the diagonal brace inner steel pipe 102 are arranged to ensure the strength while reducing the weight.

[0039] The intelligent monitoring and control system includes a monitoring and control center 6 and a sensor integration module 7. The sensor integration module 7 is installed at the bottom of the outer wall of the inner steel pipe 102 of the diagonal brace, and the sensor integration module 7 is located inside the outer steel pipe 101 of the diagonal brace. The sensor integration module 7, the axial force servo control system 103, and the warning light 104 are respectively connected to the monitoring and control center 6; the sensor integration module 7 includes a strain gauge, a ballast sensor, a displacement sensor, an inclinometer, and an accelerometer. The outer steel pipe 101 of the diagonal brace is provided with an inspection port 8 corresponding to the sensor integration module 7, and a cover 9 is installed on the inspection port 8. The axial force servo control system 103 is an electric hydraulic jack.

[0040] Strain gauge: Obtain the deformation caused by the structure being subjected to stress, and thus calculate the axial force.

[0041] Ballast sensor: precisely measures the force applied to the support.

[0042] Displacement sensor: monitors the displacement changes of the support structure, tracks position changes in real time, and helps evaluate the stability of the support system.

[0043] Inclinometer: Monitors the tilt angle of the supporting structure, especially when settlement or deformation occurs, and can provide effective tilt data to assess safety.

[0044] Accelerometers: Accelerometers can be used to monitor the dynamic response of the support structure, especially when subjected to external vibration or impact, to assess possible risks.

[0045] A construction method of an adaptive diagonal bracing support device for reverse construction of a subway station comprises the following steps:

[0046] S1. Use double-wheel milling machine 10 to construct guide wall and ground-connected wall 4 in sections; use ground-connected wall 4 as the side wall of the station, and retain ground-connected wall 4 as a permanent structure in the future; the concrete thickness of ground-connected wall 4 can be appropriately increased on the basis of keeping the original reinforcement unchanged to improve the overall waterproof performance of the station;

[0047] S2, while constructing the ground wall 4, use the pile driver 11 to construct the king column 12 within the station range, and the king column 12 is retained as a permanent column;

[0048] S3, excavate to the bottom of the station roof, remove the floating mud on the top of the ground-connected wall 4, and then cast the station roof 2. A number of first openings 13 are reserved on the station roof 2 to facilitate subsequent excavation and transportation of other materials such as the assembled adaptive diagonal brace 1;

[0049] S4, excavate to the station hall level, pour the station middle plate 3 concrete, place the embedded components 5 on the lower side around the bottom of the station middle plate 3, and reserve a number of second openings 14 on the station middle plate 3 to facilitate subsequent excavation and transportation of other materials such as the assembled adaptive diagonal brace 1;

[0050] S5, continue excavating to the bottom position of the assembled adaptive diagonal brace 1, and mark and install the embedded components 5 and the bracket at the corresponding position of the ground-connected wall 4;

[0051] S6, install the assembled adaptive diagonal brace 1, connect the diagonal brace connection ends 105 at both ends of the assembled adaptive diagonal brace 1 to the embedded components 5 using high-strength bolts, and evenly arrange them around the station on the lower side of the station middle plate 3;

[0052] S7, the axial force servo control system 103, the sensor integrated module 7 and the warning light 104 on the assembled adaptive diagonal brace 1 are connected to the monitoring and control center 6; during the subsequent construction process, the monitoring and control center 6 receives the information of the sensor integrated module 7, continuously monitors the stress and displacement signals of the assembled adaptive diagonal brace 1, ensures the construction effect and safety, and controls the axial force servo control system 103 to make corresponding adjustments as needed; the monitoring and control center 6 adjusts the color of the warning light 104 according to the abnormal situation status, the safety status warning light 104 is displayed as green light, the abnormality is displayed as yellow light but within a certain range, and the emergency situation is displayed as a red flashing light and the abnormal status position is broadcast in the monitoring and control center;

[0053] S8, excavate to the bottom of the pit and cast the bottom slab;

[0054] S9. Remove the assembled adaptive diagonal brace 1 in preparation for next use and carry out construction between the equipment inside the station.

[0055] The present invention replaces the traditional steel support internal support form with an assembled adaptive diagonal brace support device. The size and weight of the adaptive diagonal brace are greatly improved compared with the traditional steel support, which solves the problem that the traditional steel support has a large length and weight across the foundation pit and is inconvenient to construct. The adaptive diagonal brace requires a small space, which greatly increases the construction space. Combined with the intelligent monitoring and control system, it solves the shortcomings of traditional steel supports that do not fully consider real-time monitoring and adjustment and lack a dynamic response mechanism. At the same time, the use of the ground-connected wall as the side wall of the main structure of the subway station in the construction method of the present invention also greatly reduces the construction period pressure and cost issues. The present invention has the advantages of high construction efficiency, low cost and reusability.

[0056] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] The above is an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An adaptive diagonal bracing support device for reverse construction of a subway station, characterized in that: include: An assembled adaptive diagonal brace (1) comprises an outer diagonal brace steel pipe (101), an inner diagonal brace steel pipe (102), an axial force servo control system (103), a warning light (104), and a diagonal brace connecting end (105); the inner diagonal brace steel pipe (102) is sleeved and fixedly connected to the inner diagonal brace steel pipe (101), and the top of the inner diagonal brace steel pipe (102) passes through the outer diagonal brace steel pipe (101); one diagonal brace connecting end (105) is fixedly connected to the bottom of the outer diagonal brace steel pipe (101); and the other diagonal brace connecting end (105) is fixedly connected to the bottom of the outer diagonal brace steel pipe (101). 05) is fixedly connected to the fixed end of the axial force servo control system (103), the movable end of the axial force servo control system (103) is fixedly connected to the top of the inner steel pipe (102) of the diagonal brace through a flange, the warning light (104) is installed on the outer wall of the outer steel pipe (101) of the diagonal brace, and a plurality of pairs of embedded components (5) are correspondingly provided at the bottom of the station middle plate (3) and the bottom of the inner wall of the ground connection wall (4), and the two diagonal brace connection ends (105) of the assembled adaptive diagonal brace (1) are respectively detachably installed between a pair of embedded components (5); An intelligent monitoring and control system comprises a monitoring and control center (6) and a sensor integration module (7), wherein the sensor integration module (7) is installed at the bottom of the outer wall of the inner steel pipe (102) of the diagonal brace, and the sensor integration module (7) is located inside the outer steel pipe (101) of the diagonal brace, and the sensor integration module (7), the axial force servo control system (103), and the warning light (104) are respectively connected to the monitoring and control center (6).

2. The self-adaptive diagonal bracing support device for reverse construction of a subway station according to claim 1 is characterized in that: A plurality of bolt connection holes (106) are provided on the diagonal brace connection end (105).

3. The self-adaptive diagonal bracing support device for reverse construction of a subway station according to claim 2 is characterized in that: The embedded component (5) comprises a base plate (501), reinforcing steel bars (502), and a connecting plate (503). A plurality of reinforcing steel bars (502) are fixedly connected to the back of the base plate (501), and a plurality of connecting plates (503) are fixedly connected to the front of the base plate (501). The base plate (501) and the reinforcing steel bars (502) are embedded in the station middle plate (3) and the ground connection wall (4). The connecting plate (503) is provided with a plurality of through holes corresponding to the bolt connection holes (106). The connecting plate (503) and the diagonal brace connecting end (105) are fixed by bolts passing through the through holes and the bolt connection holes (106) and tightening nuts.

4. The self-adaptive diagonal bracing support device for reverse construction of a subway station according to claim 1 is characterized in that: The sensor integrated module (7) includes a strain gauge, a ballast sensor, a displacement sensor, an inclinometer, and an accelerometer.

5. The self-adaptive diagonal bracing support device for reverse construction of a subway station according to claim 1 is characterized in that: An inspection port (8) corresponding to the sensor integrated module (7) is provided on the outer steel pipe (101) of the diagonal support, and a sealing cover (9) is installed on the inspection port (8).

6. The self-adaptive diagonal bracing support device for reverse construction of a subway station according to claim 1 is characterized in that: The axial force servo control system (103) is an electric hydraulic jack.

7. A construction method of the self-adaptive diagonal bracing support device for reverse construction of a subway station according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Use a double-wheel milling machine (10) to construct the guide wall and the ground-connected wall (4) in sections; use the ground-connected wall (4) as the side wall of the station, and retain the ground-connected wall (4) as a permanent structure in the future; S2. While constructing the ground-connected wall (4), a pile driver (11) is used to construct a pillar (12) within the station area, and the pillar (12) is retained as a permanent pillar; S3, excavating to the bottom of the station roof, removing the floating mud on the top of the ground-connected wall (4), and then pouring the station roof (2), with a plurality of first openings (13) reserved on the station roof (2); S4, excavating to the station hall level, pouring the station middle plate (3) concrete, placing the embedded components (5) on the lower side around the bottom of the station middle plate (3), and reserving a plurality of second openings (14) on the station middle plate (3); S5, continue excavating to the bottom position of the assembled adaptive diagonal brace (1), and mark and install the embedded components (5) and brackets at the corresponding positions of the ground-connected wall (4); S6, installing the assembled adaptive diagonal brace (1), connecting the diagonal brace connection ends (105) at both ends of the assembled adaptive diagonal brace (1) to the embedded components (5) using high-strength bolts, and evenly arranging them around the station on the lower side of the station middle plate (3); S7, the axial force servo control system (103), the sensor integrated module (7) and the warning light (104) on the assembled adaptive diagonal brace (1) are connected to the monitoring and control center (6); during the subsequent construction process, the monitoring and control center (6) receives information from the sensor integrated module (7), continuously monitors the stress and displacement signals of the assembled adaptive diagonal brace (1), ensures the construction effect and safety, and controls the axial force servo control system (103) to make corresponding adjustments as needed; the monitoring and control center (6) adjusts the color of the warning light (104) according to the abnormal situation status, the safety status warning light (104) is displayed as green light, the abnormality is displayed as yellow light but within a certain range, and the emergency situation is displayed as a red flashing light and the abnormal status position is broadcast in the monitoring and control center; S8, excavate to the bottom of the pit and cast the bottom slab; S9. Remove the prefabricated adaptive diagonal brace (1) to prepare for next use and proceed with the construction of the equipment room inside the station.

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