A ground-wall bearing cantilever foundation for construction near a subway

Abstract

The present invention belongs to the technical field of subway construction, and in particular, relates to a ground wall bearing cantilever foundation for construction near a subway, including a ground-connected wall, in which a steel column is fixedly inserted, and a cantilevered steel frame beam is fixedly arranged on the upper side of the ground-connected wall, a plurality of beams are arranged on the cantilevered steel frame beam, and a steel cage is fixedly arranged between each beam column on both sides, and the beam column is composed of a main column and a secondary column, and the secondary column is slidably connected to the main column. The present invention can use the ground wall support structure of the early foundation pit as the bearing body of the later ground structure, and improve the overall rigidity through the on-site horizontal and vertical pressure transmission of the internal steel structure to form a functional conversion of the old and new structural facilities, and the economic benefits and green construction benefits are significantly improved. At the same time, it can effectively reduce the construction impact of the tunnel stress, and improve the rigidity of the foundation structure, avoiding the deep excavation and pile foundation drilling of the underground construction near the subway.

Description

Technical Field

[0001] The invention belongs to the technical field of subway construction, and in particular relates to a ground-wall bearing cantilever foundation for construction near a subway. Background Art

[0002] With the steady advancement of urbanization, the number of construction sites near subways has gradually increased. Usually, a safety protection zone is set up around the subway, which is within 50m outside the outer edge of the subway structure. Buildings or underground projects within this range are high-risk construction operations, and their plans should be submitted to relevant departments for technical review, and corresponding safety protection measures should be taken. No projects can be carried out within 5m on both sides of the outer edge of the subway. Therefore, the underground structures near subway buildings, especially foundation construction, have great hidden dangers.

[0003] Especially after the subway lateral foundation pit is excavated and the ground-anchored wall retaining system is formed, due to the comprehensive impact of various unloading and loading construction activities such as deep foundation pit and high-rise building pile foundation, precipitation, and stacking on the subway engineering facilities, pile foundation, excavation and other underground construction are not allowed in the subway protection area outside the ground-anchored wall, and the upper subway cover cannot be used as the foundation bearing layer. The construction activities such as foundation pit excavation, pile foundation drilling and foundation loading adjacent to the subway construction will lead to the release of soil stress within the affected area, breaking the original stress balance and water pressure balance of the soil, causing the effective stress in the soil to change, and the stress transfer will have a negative impact on the subway shield tunnel.

[0004] Therefore, we propose a ground-wall bearing cantilever foundation constructed near the subway to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a ground-wall bearing cantilever foundation for construction near a subway station in view of the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a ground wall bearing cantilever foundation for construction near a subway, comprising a ground-connected wall body, a steel column is fixedly inserted in the ground-connected wall body, and a cantilever steel frame beam is fixedly arranged on the upper side of the ground-connected wall body, a plurality of beams are arranged on the cantilever steel frame beam, a steel cage is fixedly arranged between each beam column on both sides, the beam column consists of a main column and a secondary column, and the secondary column is slidably connected to the main column, a telescopic adjustment mechanism cooperating with the secondary column is arranged on the main column, a slot cooperating with the main column is provided on the cantilever steel frame beam, and card slots are provided on both sides of the slot, a clamping mechanism cooperating with the two card slots is provided on the lower side of the main column, and a plurality of deformation buffer mechanisms are arranged on the main column.

[0007] In the above-mentioned ground wall bearing cantilever foundation for construction near a subway, the telescopic adjustment mechanism consists of a nut seat and a limit slider, the nut seat is rotatably connected to the main column, and the secondary column is threadedly connected to the nut seat, and the lower end of the secondary column is slidably connected to the main column through the limit slider.

[0008] In the above-mentioned ground-wall bearing cantilever foundation for construction near a subway, a turning handle is fixedly sleeved on the nut seat, and the thread lead angle of the nut seat is smaller than the equivalent friction angle.

[0009] In the above-mentioned ground-wall bearing cantilever foundation for construction near a subway, the clamping mechanism is composed of a bidirectional lead screw and two clamping blocks, a control cavity is opened on the lower side of the main column, and the bidirectional lead screw is rotatably arranged in the control cavity, the two clamping blocks are both threadedly connected to the bidirectional lead screw, and one end of the two clamping blocks passes through the control cavity and is clamped with the corresponding clamping groove.

[0010] In the above-mentioned ground-wall bearing cantilever foundation for construction near a subway, one end of the bidirectional lead screw passes through the control cavity and is fixedly connected to a knob, and the thread lead angle of the bidirectional lead screw is smaller than the equivalent friction angle, a magnetic piece is embedded in the card slot, and the magnetic piece and the card block are attracted to each other.

[0011] In the above-mentioned ground wall bearing cantilever foundation for construction near a subway, the deformation buffer mechanism consists of a guide seat, a stress column and a buffer spring. The guide seat is fixedly arranged on the main column, the stress column is slidably connected to the guide seat, and the sliding end of the stress column is fixedly connected to the guide seat through a buffer spring.

[0012] In the above-mentioned ground wall bearing cantilever foundation for construction near a subway, a plurality of temperature difference power generation rods are fixedly arranged on the guide seat, the hot ends of the temperature difference power generation rods extend into the guide seat, and the cold ends of the temperature difference power generation rods are sharpened, a plurality of electric heating plates are fixedly arranged in the guide seat, and the electric heating plates are electrically connected to each temperature difference power generation rod.

[0013] In the above-mentioned ground wall bearing cantilever foundation for construction near a subway, a threaded block is fixedly connected to the guide seat, and a threaded groove matching the threaded block is provided on the main column.

[0014] Compared with the existing technology, the beneficial effects of the present invention are as follows: by concealing steel columns inside the ground-connected wall, the top of the steel columns is connected to a transverse cantilevered steel beam, a steel-concrete cantilevered foundation is formed to bear the load of the upper structure of the subway tunnel, and the load is transferred to the ground-connected wall through the steel structure as a whole. This scheme reduces the construction of additional underground structures to ensure that the impact on the subway is within the allowable range of safe operation. The transverse steel beam bears the load of the subway covering the upper structure, and is connected to the steel columns concealed in the bottom-type ground-connected wall to transfer the stress load, thereby avoiding large settlement and deformation of the subway tunnel and the surrounding soil under the influence of force transfer, and the original ground-connected wall used for support replaces the tunnel. The surrounding soil is used as the main bearing body to maintain the stress balance of the environment near the subway, reduce the probability of engineering disasters, and improve the safety of operating subways. In traditional processes, the foundation pit support structure is landfilled and abandoned after the basement construction is completed, and the ground-connected wall is expensive and has a high cost of abandonment. As the bearing foundation of the later upper structure, it can improve the utilization efficiency, and the economic benefits and green construction benefits are significantly improved. In addition, the overall height of the beams and columns used in this foundation can be adjusted according to needs, and with the cooperation of the clamping mechanism, the pre-fixed installation of the beams and columns can be realized, and the deformation buffer mechanism set up can share the soil displacement stress on the beams and columns to ensure the stability of the overall structure of the beams and columns.

[0015] In summary: through the design of the present invention, the ground wall support structure of the early foundation pit can be used as the bearing body of the later ground structure, and the overall stiffness can be improved by transmitting the horizontal and vertical pressure on site through the internal steel structure, so as to form a functional conversion of the old and new structural facilities, and the economic benefits and green construction benefits are significantly improved. At the same time, it can effectively reduce the construction impact of the tunnel stress, improve the stiffness of the foundation structure, and avoid harmful behaviors such as deep excavation and pile foundation drilling in underground construction near the subway. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front perspective structural schematic diagram of a ground-wall bearing cantilever foundation for construction near a subway provided by the present invention;

[0017] Figure 2 It is a front perspective structural schematic diagram of a beam column of a ground wall bearing cantilever foundation for construction near a subway provided by the present invention;

[0018] Figure 3 It is a structural schematic diagram of the main column and slots cooperating with each other in a ground wall bearing cantilever foundation for construction near a subway provided by the present invention;

[0019] Figure 4 The present invention provides a schematic structural diagram of the mutual cooperation between a deformation buffer mechanism and a main column of a ground wall bearing cantilever foundation for construction near a subway.

[0020] In the figure: 1 ground-connected wall, 2 steel column, 3 cantilevered steel frame beam, 4 beam-column, 41 main column, 42 secondary column, 5 steel cage, 6 telescopic adjustment mechanism, 61 nut seat, 62 limit slider, 7 slot, 8 card slot, 9 card connection mechanism, 91 bidirectional lead screw, 92 card block, 10 deformation buffer mechanism, 101 guide seat, 102 stress column, 103 buffer spring, 11 turning handle, 12 control chamber, 13 knob, 14 magnetic sheet, 15 temperature difference power generation plug, 16 electric heating sheet, 17 thread block, 18 thread groove. Implementation

[0021] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0022] like Figure 1-4 As shown, a ground wall bearing cantilever foundation for construction near a subway comprises a ground-connected wall body 1, a steel column 2 is fixedly inserted in the ground-connected wall body 1, and a cantilevered steel frame beam 3 is fixedly arranged on the upper side of the ground-connected wall body 1, a plurality of beams 4 are arranged on the cantilevered steel frame beam 3, and a steel cage 5 is fixedly arranged between each beam 4 on both sides, the beam 4 consists of a main column 41 and a secondary column 42, and the secondary column 42 is slidably connected to the main column 41, and a telescopic adjustment mechanism 6 matched with the secondary column 42 is arranged on the main column 41, and the telescopic adjustment mechanism 6 consists of a nut seat 61 and a limiting slider 62, the nut seat 61 is rotatably connected to the main column 41, and the secondary column 42 is threadedly connected to the nut seat 61, and the lower end of the secondary column 42 is slidably connected to the main column 41 through the limiting slider 62, and the threaded cooperation of the nut seat 61 and the secondary column 42 makes it possible to cooperate with the limiting slider 62 when the nut seat 61 is rotated to control the secondary column 42 to move up and down, so as to achieve the height adjustment of the beam 4;

[0023] The nut seat 61 is fixedly sleeved with a turning handle 11, and the thread lead angle of the nut seat 61 is smaller than the equivalent friction angle. The setting of the turning handle 11 facilitates the user to control the rotation of the nut seat 61. The thread lead angle design of the nut seat 61 can realize self-locking between the nut seat 61 and the secondary column 42, so as to avoid the tediousness of manual locking.

[0024] A slot 7 matching with the main column 41 is provided on the cantilever steel frame beam 3, and slots 8 are provided on both sides of the slot 7. A clamping mechanism 9 matching with the two slots 8 is provided on the lower side of the main column 41. The clamping mechanism 9 is composed of a bidirectional lead screw 91 and two clamping blocks 92. A control cavity 12 is provided on the lower side of the main column 41, and the bidirectional lead screw 91 is rotatably provided in the control cavity 12. The two clamping blocks 92 are both threadedly connected with the bidirectional lead screw 91, and one end of the two clamping blocks 92 passes through the control cavity 12 and is clamped with the corresponding slots 8. By setting the bidirectional lead screw 91, the two clamping blocks 92 can be controlled to move away from each other and clamped with the corresponding slots 8 by controlling the rotation of the bidirectional lead screw 91, so as to realize the pre-fixation of the beam column 4;

[0025] One end of the bidirectional lead screw 91 passes through the control chamber 12 and is fixedly connected with a knob 13, and the thread lead angle of the bidirectional lead screw 91 is less than the equivalent friction angle. A magnetic sheet 14 is embedded in the card slot 8, and the magnetic sheet 14 and the card block 92 are attracted to each other. The setting of the knob 13 facilitates the control of the rotation of the bidirectional lead screw 91. The thread lead angle design of the bidirectional lead screw 91 can realize the self-locking between the bidirectional lead screw 91 and the card block 92. The setting of the magnetic sheet 14 can use its own magnetic force to ensure the stability of the docking of the card block 92 and the card slot 8.

[0026] A plurality of deformation buffer mechanisms 10 are arranged on the main column 41, and the deformation buffer mechanism 10 is composed of a guide seat 101, a stress column 102 and a buffer spring 103. The guide seat 101 is fixedly arranged on the main column 41, and a thread block 17 is fixedly connected to the guide seat 101, and a thread groove 18 matching with the thread block 17 is provided on the main column 41. The matching of the thread block 17 and the thread groove 18 facilitates the disassembly and replacement of the guide seat 101 in the later stage. The stress column 102 is slidably connected to the guide seat 101, and the sliding end of the stress column 102 is fixedly connected to the guide seat 101 through the buffer spring 103. Through the matching of the arranged stress column 102 and the buffer spring 103, when the beam column 4 is subjected to the displacement stress of the soil, the deformation of the buffer spring 103 can be used to buffer and offset a part of the stress;

[0027] A plurality of thermoelectric power generation rods 15 are fixedly arranged on the guide seat 101, and the hot ends of the thermoelectric power generation rods 15 extend to be arranged in the guide seat 101, and the cold ends of the thermoelectric power generation rods 15 are sharpened. A plurality of electric heating plates 16 are fixedly arranged in the guide seat 101, and the electric heating plates 16 are electrically connected to each of the thermoelectric power generation rods 15. The thermoelectric power generation rods 15 can improve the connection points between the beam column 4 and the soil, and ensure the stability of the beam column 4. At the same time, when the soil is moist and loose, the cold ends of the thermoelectric power generation rods 15 will be cooled due to the action of water vapor, so that the thermoelectric power generation rods 15 generate a temperature difference, and then generate current to power each of the electric heating plates 16, so that the electric heating plates 16 generate heat to heat the soil near the deformation buffer mechanism 10, and automatically alleviate the moist state of the soil.

[0028] The operating principle of the present invention is now described as follows:

[0029] During the implementation of this foundation, the cantilevered steel frame beam 3 can be fixed to the upper side of the ground-connected wall 1 by welding to ensure the stability of the cantilevered steel frame beam 3. Subsequently, each beam column 4 is plugged into the corresponding slot 7. Then, the knob 13 is turned, and the knob 13 drives the bidirectional lead screw 91 to rotate, so that the two clamping blocks 92 move away from each other and engage with the corresponding clamping slots 8, thereby pre-fixing the beam column 4. When the height of the beam column 4 needs to be adjusted, the handle 11 is turned, and the handle 11 drives the nut seat 61 to rotate, and the limit slider 6 2, the auxiliary column 42 will rise or fall, and then the height adjustment of the beam column 4 can be realized. The beam columns 4 are fixed by the steel cage 5 to ensure the overall stability and force of the beam column 4. Subsequently, the beam column 4 can be fixed by pouring concrete. After the implementation of this foundation, the load of the subway covering upper structure is carried by the transverse cantilevered steel frame beam 3, and it is connected with the steel column 2 hidden in the bottom-type ground-connected wall 1 to transfer the stress load, thereby avoiding large settlement and deformation of the subway tunnel and the surrounding soil under the influence of force transfer.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ground-wall bearing cantilever foundation for construction near a subway, comprising a ground-connected wall (1), characterized in that: A steel column (2) is fixedly inserted in the ground-connected wall (1), and a cantilevered steel frame beam (3) is fixedly arranged on the upper side of the ground-connected wall (1), a plurality of beams (4) are arranged on the cantilevered steel frame beam (3), and a steel cage (5) is fixedly arranged between each beam column (4) located on both sides, the beam column (4) is composed of a main column (41) and a secondary column (42), and the secondary column (42) is slidably connected to the main column (41), and a telescopic adjustment mechanism (6) matching the secondary column (42) is arranged on the main column (41), a slot (7) matching the main column (41) is provided on the cantilevered steel frame beam (3), and both sides of the slot (7) are provided with a clamping slot (8), a clamping mechanism (9) matching the two clamping slots (8) is provided on the lower side of the main column (41), and a plurality of deformation buffer mechanisms (10) are arranged on the main column (41); The deformation buffer mechanism (10) is composed of a guide seat (101), a stress column (102) and a buffer spring (103); the guide seat (101) is fixedly arranged on the main column (41); the stress column (102) is slidably connected to the guide seat (101); and the sliding end of the stress column (102) is fixedly connected to the guide seat (101) via the buffer spring (103); A plurality of temperature difference power generation plug rods (15) are fixedly arranged on the guide seat (101), the hot ends of the temperature difference power generation plug rods (15) extend into the guide seat (101), and the cold ends of the temperature difference power generation plug rods (15) are sharpened. A plurality of electric heating plates (16) are fixedly arranged in the guide seat (101), and the electric heating plates (16) are electrically connected to each temperature difference power generation plug rod (15).

2. The ground wall bearing cantilever foundation for construction near a subway according to claim 1, characterized in that: The telescopic adjustment mechanism (6) is composed of a nut seat (61) and a limiting slide block (62); the nut seat (61) is rotatably connected to the main column (41), and the secondary column (42) is threadedly connected to the nut seat (61); the lower end of the secondary column (42) is slidably connected to the main column (41) via the limiting slide block (62).

3. The ground wall bearing cantilever foundation for construction near a subway according to claim 2, characterized in that: The nut seat (61) is fixedly sleeved with a turning handle (11), and the thread lead angle of the nut seat (61) is smaller than the equivalent friction angle.

4. The ground-wall bearing cantilever foundation for construction near a subway according to claim 1, characterized in that: The clamping mechanism (9) is composed of a bidirectional lead screw (91) and two clamping blocks (92); a control cavity (12) is provided on the lower side of the main column (41); the bidirectional lead screw (91) is rotatably disposed in the control cavity (12); the two clamping blocks (92) are both threadedly connected to the bidirectional lead screw (91); and one end of the two clamping blocks (92) passes through the control cavity (12) and is clamped to a corresponding clamping groove (8).

5. The ground wall bearing cantilever foundation for construction near a subway according to claim 4, characterized in that: One end of the bidirectional lead screw (91) passes through the control chamber (12) and is fixedly connected to a knob (13), and the thread lead angle of the bidirectional lead screw (91) is smaller than the equivalent friction angle. A magnetic sheet (14) is embedded in the clamping groove (8), and the magnetic sheet (14) and the clamping block (92) attract each other.

6. The ground wall bearing cantilever foundation for construction near a subway according to claim 1, characterized in that: A threaded block (17) is fixedly connected to the guide seat (101), and a threaded groove (18) matching the threaded block (17) is formed on the main column (41).

Images