A road surface foundation pit supporting structure

Abstract

The utility model relates to road surface foundation pit technical field, and disclose a kind of road surface foundation pit supporting structure, including foundation pit ontology and rear support rod, the outer surface of foundation pit ontology is connected with front row stake and rear row stake and is inserted, the outer surface of front row stake is provided with front support connecting piece, the outer surface of rear row stake is provided with rear support connecting piece, this road surface foundation pit supporting structure, by the adjustment and front support connecting piece's adhesion supporting degree and the supporting length of itself of double-end electric telescopic rod in fixed sleeve, rear support rod rotates by servo motor drive screw rod, drive sliding seat and mounting frame to move, adjust the inserted length of protection cover cylinder and rear support rod slot to change rear support size, add the real-time monitoring support pressure of front support rod and rear support rod's pressure sensor, form the cooperative support system of dynamically adjustable supporting degree and length, to reach according to the real-time change of foundation pit peripheral soil pressure and carry out self-adapting adjustment, reduce the effect of unsatisfactory supporting effect.

Description

Technical Field

[0001] This utility model relates to the field of road foundation pit technology, specifically a road foundation pit support structure. Background Technology

[0002] With the increasing number of high-rise buildings, deep foundation pit support technology has been widely applied and has achieved success in practice. However, due to a lack of scientific testing data, scientific analysis is impossible. Deep foundation pit support is a risky project; even slight negligence can lead to dangers such as building and road collapse, and foundation pit collapse. This not only delays the construction period and increases project costs, but more seriously, it endangers human lives, which must be taken very seriously. Foundation pit (trench) support with an excavation depth exceeding 3 meters (inclusive), or even if it does not exceed 3 meters but the geological conditions and surrounding environment are complex, falls under the category of high-risk sub-projects. For foundation pit support projects with an excavation depth exceeding 5 meters (inclusive), or even if it does not exceed 5 meters but the geological conditions, surrounding environment, and underground pipelines are complex, or the safety of adjacent buildings is affected, ensuring the stability of the soil around the foundation pit is crucial during road foundation pit construction.

[0003] Most existing support structures cannot adaptively adjust to real-time changes in soil pressure around the foundation pit, resulting in poor support effectiveness and even safety accidents. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a roadbed foundation pit support structure to solve the problem mentioned in the background art that most existing support structures cannot adaptively adjust according to real-time changes in soil pressure around the foundation pit, resulting in poor support effect and even causing safety accidents.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a road foundation pit support structure, comprising a foundation pit body and a rear support rod, wherein a front row of piles and a rear row of piles are inserted and connected to the outer surface of the foundation pit body, a front support connector is provided on the outer surface of the front row of piles, a rear support connector is provided on the outer surface of the rear row of piles, a fixing sleeve is provided on the outer surface of the front support connector, a double-headed electric telescopic rod is fixedly installed inside the fixing sleeve, a front support rod is inserted and connected to the outer surface of the fixing sleeve, and the output end of the double-headed electric telescopic rod is connected to the front support connector and... The outer surface of the front support rod is fitted and connected, and a protective cover is fixedly installed on the outer surface of the rear support connector. A servo motor is fixedly installed on the outer surface of the rear support rod, and a connecting frame is fixedly installed on the outer surface of the servo motor. A lead screw is fixedly installed at the output end of the servo motor, and a slide block is slidably connected to the outer surface of the lead screw. A mounting bracket is fixedly installed on the outer surface of the slide block, and the mounting bracket is fixedly connected to the protective cover. A slot is opened on the outer surface of the rear support rod, and the slot is inserted into the protective cover. Both the front support rod and the rear support rod are equipped with pressure sensors.

[0006] Preferably, the outer surfaces of the front and rear piles are provided with steel plates, and the outer surface of the foundation pit body is connected with baffles. The outer surfaces of both the baffles and the steel plates are provided with recesses, and the outer surfaces of both the baffles and the steel plates are fixedly installed with protrusions. The baffles are connected to each other through the protrusions and recesses, and the steel plates are connected to each other through the protrusions and recesses. A sealing gasket is provided at the connection between the protrusions and the recesses, and the outer surfaces of both the protrusions and the recesses are provided with fixing bolts. The protrusions and recesses are fixedly connected by the fixing bolts.

[0007] Preferably, multiple water level sensors are installed around the perimeter of the foundation pit body, and displacement sensors are installed on the steel plate, front row piles, rear row piles, front support columns and rear support columns. A controller is installed on the outer surface of the foundation pit body, and the controller is electrically connected to the water level sensors, displacement sensors, servo motors, double-headed electric telescopic rods and pressure sensors.

[0008] Preferably, the baffle and the steel plate are set at an angle of 90 degrees, the outer surface of the baffle is in close contact with the front row of piles, a fixed socket is fixedly installed on the outer surface of the baffle, and an I-beam reinforcing steel is inserted and connected to the outer surface of the fixed socket.

[0009] Preferably, the front support connector is set at a 45-degree angle to the front row of piles, the rear support connector is set at a 45-degree angle to the rear row of piles, and mounting bolts are provided on the outer surfaces of the front row of piles and the rear row of piles, and the front row of piles and the rear row of piles are fixedly connected by the mounting bolts.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. This roadbed pit support structure uses a double-headed electric telescopic rod inside a fixed sleeve to adjust the contact strength and support length with the front support connector. The rear support rod is driven by a servo motor to rotate the lead screw, which moves the slide and mounting frame. The insertion length of the protective cover and the rear support rod slot is adjusted to change the size of the rear support. In addition, pressure sensors on the front and rear support rods monitor the support pressure in real time, forming a collaborative support system that can dynamically adjust the support strength and length. This achieves adaptive adjustment based on the real-time changes in the soil pressure around the pit, reducing the effectiveness of poor support.

[0012] 2. In this roadbed pit support structure, the baffles and steel plates are connected by inserting protrusions and recesses to achieve rapid positioning and initial fixation. Combined with the tightening effect of fixing bolts, rigid connection nodes are formed, preventing relative displacement of the connection parts due to stress. This allows the baffles and steel plates to form continuous support units. At the same time, the sealing gaskets at the connection between the protrusions and recesses fill the gaps, blocking the seepage path of water or soil. This achieves the effect of improving the restraint capacity of the pit sidewall and enhancing the stability and durability of the pit support. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0014] Figure 2 This is a schematic diagram of the front row of piles of this utility model;

[0015] Figure 3 This is a front sectional view of the rear pile structure of this utility model;

[0016] Figure 4 The structure of this utility model Figure 3 Schematic diagram at point A in the middle;

[0017] Figure 5 The structure of this utility model Figure 3 Schematic diagram at point B in the middle;

[0018] Figure 6 This is a side view of the structure of this utility model;

[0019] Figure 7 This is a schematic diagram of the steel plate and baffle structure of this utility model.

[0020] In the diagram: 1. Excavation pit body; 2. Steel plate; 3. Front row of piles; 4. Rear row of piles; 5. Front support connector; 6. Front support rod; 7. Rear support connector; 8. Rear support rod; 9. Fixing sleeve; 10. Protective cover; 11. Double-headed electric telescopic rod; 12. Servo motor; 13. Connecting frame; 14. Lead screw; 15. Slide seat; 16. Mounting frame; 17. Slot; 18. Baffle; 19. Recess; 20. Protrusion; 21. Fixing socket; 22. I-beam reinforcing steel. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1:

[0023] Please refer to the following: Figure 1-7 ,

[0024] A roadbed pit support structure includes a pit body 1 and a rear support rod 8. Front piles 3 and rear piles 4 are inserted and connected to the outer surface of the pit body 1. Front support connectors 5 are provided on the outer surface of the front piles 3, and rear support connectors 7 are provided on the outer surface of the rear piles 4. A fixing sleeve 9 is provided on the outer surface of the front support connector 5. A double-headed electric telescopic rod 11 is fixedly installed inside the fixing sleeve 9. A front support rod 6 is inserted and connected to the outer surface of the fixing sleeve 9. The output end of the double-headed electric telescopic rod 11 is fitted and connected to the outer surfaces of the front support connector 5 and the front support rod 6. The rear support... A protective cover is fixedly installed on the outer surface of connector 7. A servo motor 12 is fixedly installed on the outer surface of the rear support rod 8. A connecting bracket 13 is fixedly installed on the outer surface of the servo motor 12. A lead screw 14 is fixedly installed at the output end of the servo motor 12. A slide block 15 is slidably connected to the outer surface of the lead screw 14. A mounting bracket 16 is fixedly installed on the outer surface of the slide block 15. The mounting bracket 16 is fixedly connected to the protective cover cylinder 10. A slot 17 is opened on the outer surface of the rear support rod 8. The slot 17 is inserted into the protective cover cylinder 10. Pressure sensors are provided on both the front support rod 6 and the rear support rod 8.

[0025] Specifically, the double-headed electric telescopic rod 11 inside the fixed sleeve 9 adjusts the contact support force and its own support length with the front support connector 5. The rear support rod 8 is driven by the servo motor 12 to rotate the lead screw 14, which in turn moves the slide block 15 and the mounting bracket 16. The insertion length of the protective cover cylinder 10 and the slot 17 of the rear support rod 8 is adjusted to change the size of the rear support. In addition, the pressure sensors of the front support rod 6 and the rear support rod 8 monitor the support pressure in real time, forming a collaborative support system that can dynamically adjust the support force and length. This achieves adaptive adjustment according to the real-time changes in the soil pressure around the foundation pit, reducing the effect of poor support.

[0026] In the embodiment: the front support connector is set at an angle of 45 degrees to the front row of piles 3, the rear support connector is set at an angle of 45 degrees to the rear row of piles 4, and the outer surfaces of the front row of piles 3 and the rear row of piles 4 are provided with mounting bolts, and the front row of piles 3 and the rear row of piles 4 are fixedly connected by mounting bolts.

[0027] Specifically, the front support connector and the front row of piles 3, and the rear support connector and the rear row of piles 4 are all set at a 45-degree angle. This can decompose the lateral force transmitted from the foundation pit body 1 to the pile body into components perpendicular to the pile body and along the axial direction of the connector, reducing local stress concentration and allowing the load to be transmitted more evenly to the front support rod 6 and the rear support rod 8. At the same time, the front row of piles 3 and the rear row of piles 4 are fixedly connected by installation bolts to form a rigid integral structure, avoiding relative displacement between the two due to force and ensuring that the front and rear rows of piles 4 bear the load together.

[0028] Working principle: When the stress on the foundation pit changes, the double-headed electric telescopic rod 11 can be driven to extend and retract synchronously at both ends through forward and reverse rotation. If it is necessary to increase the front support strength, the two ends of the telescopic rod extend outward, one end exerts a thrust on the front support connector 5, and the other end pushes the front support rod 6 to extend outward, making the contact between the front support rod 6 and the external support structure such as the cap beam and anchor bolts more compact, thereby improving the overall support rigidity. If it is necessary to reduce the support strength to accommodate the slight deformation of the foundation pit, the two ends of the telescopic rod retract inward, reducing the contact between the front support connector 5 and the front support rod 6 through the reverse force. To mitigate stress and prevent breakage of the support structure due to excessive stress, the front support system can flexibly adjust the effective support length of the front support rod 6 and the force exerted on the front piles 3 through the telescopic adjustment of the double-headed electric telescopic rod 11, achieving dynamic adaptation to the stress on the front of the foundation pit. When the stress on the rear foundation pit changes, the servo motor 12 drives the lead screw 14 to rotate via forward and reverse rotation, causing the slide block 15 to move axially along the lead screw 14. If it is necessary to increase the length of the rear support, the slide block 15 moves away from the servo motor 12, and the protective structure is pulled by the mounting bracket 16. The cover 10 slides outward along the slot 17 of the rear support rod 8, increasing the insertion depth of the protective cover 10 and the slot 17, thus extending the effective support length of the rear support rod 8 and increasing the constraint force on the rear pile 4. If it is necessary to shorten the length of the rear support, the slide 15 moves towards the servo motor 12, pushing the protective cover 10 to retract inward along the slot 17, reducing the insertion depth and shortening the support length to reduce the support force. The two are combined with the real-time monitoring and feedback adjustment of the pressure sensor to form a closed-loop mechanism of "monitoring-feedback-adjustment". This mechanism can dynamically adapt to the complex forces generated by geological changes, load fluctuations, and sidewall deformation during the construction of the foundation pit, continuously ensuring the stable constraint of the front pile 3 and the rear pile 4 on the foundation pit body 1, and ultimately achieving the effects of preventing foundation pit collapse, controlling deformation, and improving the safety and adaptability of the support. Compared with related technologies, the road foundation pit support structure provided by this utility model has the following beneficial effects: it achieves adaptive adjustment according to the real-time changes in the soil pressure around the foundation pit, reducing the effect of poor support.

[0029] Example 2:

[0030] Please refer to the following: Figure 1-7 ,

[0031] Steel plates 2 are provided on the outer surfaces of the front row of piles 3 and the rear row of piles 4. Baffles 18 are inserted and connected to the outer surface of the foundation pit body 1. Recesses 19 are provided on the outer surfaces of both baffles 18 and steel plates 2. Protrusions 20 are fixedly installed on the outer surfaces of both baffles 18 and steel plates 2. Baffles 18 are connected to each other through protrusions 20 and recesses 19. Steel plates 2 are connected to each other through protrusions 20 and recesses 19. Sealing gaskets are provided at the connection between protrusions 20 and recesses 19. Fixing bolts are provided on the outer surfaces of both protrusions 20 and recesses 19. Protrusions 20 and recesses 19 are fixedly connected by fixing bolts.

[0032] Specifically, the baffles 18 and steel plates 2 are connected by the insertion of protrusions 20 and recesses 19 to achieve rapid positioning and initial fixation. With the tightening effect of the fixing bolts, a rigid connection node is formed, which avoids relative displacement of the connection parts due to force, so that the baffles 18 and steel plates 2 respectively form continuous retaining units. At the same time, the sealing gasket at the connection between the protrusions 20 and the recesses 19 fills the gaps and blocks the seepage path of water or soil, thereby improving the constraint capacity of the pit sidewall and enhancing the stability and durability of the pit support.

[0033] In this embodiment: multiple water level sensors are installed around the foundation pit body 1, and displacement sensors are installed on the steel plate 2, front pile 3, rear pile 4, front support column and rear support column. A controller is installed on the outer surface of the foundation pit body 1, and the controller is electrically connected to the water level sensor, displacement sensor, servo motor 12, double-headed electric telescopic rod 11 and pressure sensor.

[0034] Specifically, the water level sensor monitors the water level changes around the foundation pit in real time, the displacement sensor captures the displacement data of the steel plate 2, the front pile 3, the rear pile 4 and the support column, and the pressure sensor provides feedback on the stress state of the support structure. All types of sensors transmit the data to the controller in real time. The controller analyzes and judges the data. When the monitored value exceeds the safety threshold, it automatically sends adjustment commands to the servo motor 12 and the double-headed electric telescopic rod 11 to drive the support structure to dynamically adjust the support force and length. The controller is an existing structure, and the control circuit can be implemented by those skilled in the art through simple programming. It is common knowledge in the field and is only used without modification. Therefore, the control method and circuit connection will not be described in detail to facilitate centralized control of the relevant structures.

[0035] In the embodiment: the baffle 18 is set at an angle of 90 degrees to the steel plate 2, the outer surface of the baffle 18 is attached to the front row of piles 3, the outer surface of the baffle 18 is fixedly installed with a fixed socket 21, and the outer surface of the fixed socket 21 is inserted and connected with an I-beam reinforcing steel 22.

[0036] Specifically, the baffle 18 is set perpendicular to the steel plate 2 at a 90-degree angle, forming a three-dimensional intersecting force-bearing node. This disperses the soil pressure on the side wall of the foundation pit borne by the baffle 18 and the pile constraint force transmitted by the steel plate 2 in the vertical direction, avoiding the concentration of force in a single direction. The baffle 18 is closely connected to the front row of piles 3, directly transmitting the lateral load to the front row of piles 3, reducing the deformation of the baffle 18 itself. The fixed socket 21 strengthens the structural rigidity of the baffle 18 by inserting I-beam reinforcing steel 22, utilizing the high bending resistance of the I-beam, and preventing the baffle 18 from bending or displacing due to force.

[0037] Working principle: Steel plates 2 are installed on the outer surfaces of the front row of piles 3 and the rear row of piles 4. Baffles 18 are inserted and connected to the outer surface of the foundation pit body 1. Recesses 19 are formed on the outer surfaces of both baffles 18 and steel plates 2. Protrusions 20 are fixedly installed on the outer surfaces of both baffles 18 and steel plates 2. Baffles 18 are connected to each other through protrusions 20 and recesses 19. Steel plates 2 are connected to each other through protrusions 20 and recesses 19. Sealing gaskets are provided at the connection between protrusions 20 and recesses 19. Fixing bolts are provided on the outer surfaces of protrusions 20 and recesses 19. Protrusions 20 and recesses 19 are fixedly connected by fixing bolts. The connection between baffle 18 and steel plate 2 and steel plate 2 is achieved through the insertion of protrusion 20 and recess 19, enabling rapid positioning and initial fixation. Combined with the tightening action of fixing bolts, a rigid connection node is formed, preventing relative displacement of the connection parts due to force. This allows baffle 18 and steel plate 2 to form continuous retaining units. At the same time, the sealing gasket at the connection between protrusion 20 and recess 19 fills the gap, blocking the seepage path of water or soil. Compared with related technologies, the road foundation pit support structure provided by this utility model has the following beneficial effects: thereby improving the constraint capacity of the foundation pit sidewall and enhancing the stability and durability of the foundation pit support.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A roadbed pit support structure, comprising a pit body (1) and a rear strut (8), characterized in that: The outer surface of the foundation pit body (1) is connected to a front row of piles (3) and a rear row of piles (4). The outer surface of the front row of piles (3) is provided with a front support connector (5), and the outer surface of the rear row of piles (4) is provided with a rear support connector (7). The outer surface of the front support connector (5) is provided with a fixing sleeve (9). A double-headed electric telescopic rod (11) is fixedly installed inside the fixing sleeve (9). A front support rod (6) is inserted and connected to the outer surface of the fixing sleeve (9). The output end of the double-headed electric telescopic rod (11) is fitted and connected to the outer surface of the front support connector (5) and the front support rod (6). The outer surface of the rear support connector (7) is fixedly installed with a protective cover. The cover has a servo motor (12) fixedly installed on the outer surface of the rear support rod (8), a connecting frame (13) fixedly installed on the outer surface of the servo motor (12), a lead screw (14) fixedly installed at the output end of the servo motor (12), a slide block (15) slidably connected to the outer surface of the lead screw (14), a mounting bracket (16) fixedly installed on the outer surface of the slide block (15), and the mounting bracket (16) fixedly connected to the protective cover cylinder (10). The outer surface of the rear support rod (8) has a slot (17) which is inserted into the protective cover cylinder (10). Both the front support rod (6) and the rear support rod (8) are equipped with pressure sensors.

2. The roadbed pit support structure according to claim 1, characterized in that: Steel plates (2) are provided on the outer surfaces of the front piles (3) and the rear piles (4). Baffles (18) are inserted and connected to the outer surface of the foundation pit body (1). Recesses (19) are provided on the outer surfaces of both the baffles (18) and the steel plates (2). Protrusions (20) are fixedly installed on the outer surfaces of both the baffles (18) and the steel plates (2). The baffles (18) are connected to each other through the protrusions (20) and the recesses (19). The steel plates (2) are connected to each other through the protrusions (20) and the recesses (19). A sealing gasket is provided at the connection between the protrusions (20) and the recesses (19). Fixing bolts are provided on the outer surfaces of both the protrusions (20) and the recesses (19). The protrusions (20) and the recesses (19) are fixedly connected by the fixing bolts.

3. The roadbed pit support structure according to claim 2, characterized in that: Multiple water level sensors are installed around the foundation pit body (1). Displacement sensors are installed on the steel plate (2), front pile (3), rear pile (4), front support column and rear support column. A controller is installed on the outer surface of the foundation pit body (1). The controller is electrically connected to the water level sensor, displacement sensor, servo motor (12), double-headed electric telescopic rod (11) and pressure sensor.

4. The roadbed pit support structure according to claim 2, characterized in that: The baffle (18) is set at an angle of 90 degrees to the steel plate (2). The outer surface of the baffle (18) is in close contact with the front row of piles (3). A fixed socket (21) is fixedly installed on the outer surface of the baffle (18). An I-beam reinforcing steel (22) is inserted and connected to the outer surface of the fixed socket (21).

5. A roadbed pit support structure according to claim 2, characterized in that: The front support connector is set at a 45-degree angle to the front row of piles (3), and the rear support connector is set at a 45-degree angle to the rear row of piles (4). The outer surfaces of the front row of piles (3) and the rear row of piles (4) are provided with mounting bolts, and the front row of piles (3) and the rear row of piles (4) are fixedly connected by the mounting bolts.

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