A foundation pit concrete support servo system and its construction method

Abstract

The invention discloses a foundation pit concrete support servo system and a construction method thereof, which belong to the technical field of building construction, and include a retaining structure arranged on the side wall of the foundation pit, and are characterized in that: it also includes a concrete support and a modular servo system; a plurality of openings facing the retaining structure are arranged on the side wall of the concrete support, and connection seats are pre-buried at the openings; the modular servo system includes a main rod detachably arranged on the connection seat, and the upper and lower end surfaces of the main rod are both provided with auxiliary rods inclined toward the retaining structure, and auxiliary support structures are arranged between the auxiliary rod and the main rod, and hydraulic jacks are horizontally arranged on the ends of the main rod and the web rod facing the retaining structure; the modular servo system also includes a hydraulic servo control system for controlling the hydraulic jacks; its purpose is to solve the problem that in the existing foundation pit concrete support servo system, a layer of concrete support is matched with a layer of hydraulic jack, and multiple systems are arranged along the depth direction of the foundation pit, resulting in uneven force on the retaining in the vertical direction.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a foundation pit concrete support servo system and a construction method thereof. Background Art

[0002] In order to effectively utilize the urban area, the development of urban underground space is constantly advancing; and in the process of underground space development, construction will cause disturbances to existing buildings such as nearby transportation facilities. In order to protect existing buildings, it is necessary to set up retaining structures during the foundation pit construction process to prevent disturbances to existing buildings. At the same time, during the construction of the foundation pit project, the retaining structure of the foundation pit must be stable and not deformed significantly, so it is necessary to provide stable support for the retaining structure. The existing technology uses concrete supports in combination with hydraulic jacks, and controls the support axial force of the hydraulic jacks through a servo system; however, the existing foundation pit concrete support servo system has one layer of concrete support combined with one layer of hydraulic jacks, and multiple systems are arranged along the depth direction of the foundation pit, resulting in uneven vertical force on the retaining structure. Summary of the invention

[0003] In view of this, the present invention discloses a foundation pit concrete support servo system and a construction method thereof, which aims to solve the problem in the existing foundation pit concrete support servo system that a layer of concrete support is matched with a layer of hydraulic jack, and multiple systems are arranged along the depth direction of the foundation pit, resulting in uneven vertical force on the enclosure.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A foundation pit concrete support servo system includes a retaining structure arranged on the side wall of the foundation pit, and also includes a concrete support and a modular servo system; the side wall of the concrete support is provided with a plurality of openings facing the retaining structure, and the openings are all pre-buried with connecting seats; the modular servo system includes a main rod detachably arranged on the connecting seat, the main rod is arranged horizontally, and the upper and lower end surfaces of the main rod are both provided with auxiliary rods inclined toward the retaining structure, and an auxiliary supporting structure is arranged between the auxiliary rod and the main rod, and hydraulic jacks are horizontally arranged on the ends of the main rod and the web rod facing the retaining structure; the modular servo system also includes a hydraulic servo control system for controlling the hydraulic jacks.

[0006] In this solution, the main rod and the auxiliary rod are coordinated to make the modular servo system on a layer of concrete support correspond to three effective support points, which can simultaneously provide three-point vertical support for the enclosing structure. Three layers of servo systems can be arranged vertically through a single fulcrum of a single-layer concrete support, which has a larger control range, more uniform force, and can save a lot of concrete horizontal support.

[0007] Furthermore, mounting seats are arranged on the upper and lower end faces of the main rod, and one end of the auxiliary rod away from the retaining structure is hinged to the mounting seat; the auxiliary support structure includes two arc-shaped front support plates symmetrically arranged with respect to the auxiliary rod, the front support plates are fixedly connected to the main rod, arc-shaped grooves are formed in the front support plates, and the centers of the front support plates coincide with the adjacent mounting seats; sliding sections slidably connected to the arc-shaped grooves are fixedly arranged on both sides of the auxiliary rod, and a power structure for driving the sliding sections to slide relative to the arc-shaped grooves is arranged on the sliding sections.

[0008] The auxiliary rod swings relative to the main rod through the mounting seat, and the sliding sections are driven to slide in the arc-shaped grooves through the power structure, so as to adjust the inclination angle of the auxiliary rod, and the end of the auxiliary rod is vertically moved to the stressed part of the retaining structure to meet different construction conditions; the arc-shaped front support plates apply a traction force towards the retaining structure to the auxiliary rod, preventing the recoil force generated by the hydraulic jack from causing the auxiliary rod to swing and affecting the support of the retaining structure.

[0009] Furthermore, the auxiliary support structure further includes a rear support rod, and the rear support rod includes a fixed section and a moving section. A mounting seat detachably connected to the connecting seat is fixedly arranged at the end of the main rod. One end of the fixed section is hinged to the mounting seat. The moving section is coaxially and slidably connected to the inside of the other end of the fixed section. The end of the moving section is hinged to the side wall of the auxiliary rod; a locking structure for locking the sliding of the moving section relative to the fixed section is arranged on the fixed section.

[0010] In this solution, the rear support rod is composed of a fixed section and a moving section that slide relative to each other, and can maintain connection with the auxiliary rod during the adjustment of the inclination angle of the auxiliary rod; when the auxiliary rod is adjusted in place, the sliding of the moving section relative to the fixed section is restricted by the locking structure, so as to provide a support force for the auxiliary rod and prevent the auxiliary rod from bending and deflecting.

[0011] Furthermore, the power structure includes a substrate slidably arranged coaxially at the end of the sliding section. A telescopic cylinder for driving the substrate to slide is arranged on the sliding section. Driving motors facing the auxiliary rod are respectively arranged at both ends of the substrate. Driving gears are fixedly arranged on the output ends of the driving motors. Tooth grooves meshing with the driving gears are arranged on the arc-shaped side walls of the front support plates. One end of the tooth groove facing the auxiliary rod penetrates through the front support plate, and the length of the tooth groove is greater than the thickness of the driving gear. A limiting hole adapted to the outer shape of the driving gear is arranged on the auxiliary rod; a plurality of limiting protrusions are fixedly arranged on the side of the substrate facing the front support plate, and a plurality of limiting grooves cooperating with the limiting protrusions are arranged on the side wall of the front support plate.

[0012] In this solution, when it is necessary to adjust the inclination angle of the secondary rod, the telescopic cylinder is controlled to extend. The telescopic cylinder drives the substrate to move away from the secondary rod. The substrate drives the limit protrusion and the driving gear to disengage from the limit groove and the limit hole respectively, releasing the locking of the secondary rod and enabling the secondary rod to swing. At this time, the driving motor is driven to drive the driving gear to rotate. Through the meshing between the driving gear and the tooth groove, the sliding section is driven to slide along the arc groove, thereby adjusting the inclination angle of the secondary rod to ensure that the stress part of the end of the secondary rod and the retaining structure are on the same horizontal line. After the adjustment is completed, the telescopic cylinder is controlled to shorten. The telescopic cylinder drives the substrate to move towards the secondary rod. The substrate drives the limit protrusion and the driving gear to insert into the limit groove and the limit hole respectively, restoring the locking of the secondary rod and preventing the angle deflection of the secondary rod during construction.

[0013] Furthermore, the locking structure includes a number of positioning grooves provided on both sides of the inner wall of the fixed section. Installation grooves are opened on both sides of the moving section. Support blocks are slidably connected in the installation grooves. A number of positioning pins cooperating with the positioning grooves are provided on the support blocks. An expansion rod is provided between the support blocks and the installation grooves.

[0014] When it is necessary to adjust the inclination angle of the secondary rod, the expansion rod is controlled to shorten. The expansion rod drives the positioning pin to slide out of the positioning groove through the support block, releasing the locking between the moving section and the fixed section and enabling the rear strut to maintain the connection with the secondary rod. After the adjustment of the secondary rod is completed, the expansion rod is controlled to extend. The expansion rod drives the positioning pin to re-insert into the positioning groove through the support block, restoring the locking between the moving section and the fixed section, thereby supporting the secondary rod.

[0015] Furthermore, a vertically swinging support is hinged to the end of the secondary rod facing the retaining structure. The corresponding hydraulic jack of the secondary rod is arranged on the support. A swinging motor for driving the support to swing is provided on the end of the secondary rod.

[0016] By driving the motor to drive the support to swing, the corresponding hydraulic jack of the secondary rod is aligned with the retaining structure, accurately controlling the axial force direction of the hydraulic jack, which is convenient for subsequent adjustment of the axial force of the hydraulic jack through the hydraulic servo control system.

[0017] A construction method for a foundation pit concrete support servo system includes the following steps:

[0018] 1). Excavate the first layer of soil in the foundation pit and erect a pile foundation for vertically supporting the concrete support.

[0019] 2). Bind the steel bars for pouring the concrete support, lay the formwork and embed a connecting seat at the opening, and then pour the first layer of concrete support.

[0020] 3). After the first concrete support is poured and formed, place the modular servo system at the opening of the concrete support and connect and fix the mounting seat and the connecting seat.

[0021] 4), Control the telescopic cylinder to extend. The telescopic cylinder drives the substrate to move away from the auxiliary rod. The substrate drives the limit protrusion and the driving gear to disengage from the limit groove and the limit hole respectively, releasing the locking of the auxiliary rod. At this time, the driving gear only meshes with the tooth groove. At the same time, control the telescopic rod to shorten. The telescopic rod drives the positioning pin to slide out of the positioning groove through the support block, releasing the locking between the moving section and the fixed section.

[0022] 5), Drive the driving gear to rotate through the driving motor. Through the meshing between the driving gear and the tooth groove, drive the sliding section to slide along the arc groove, thereby adjusting the inclination angle of the auxiliary rod to ensure that the end of the auxiliary rod and the stress part of the retaining structure are on the same horizontal line. At the same time, the auxiliary rod drives the moving section to slide relative to the fixed section. Then drive the support to swing through the driving motor so that the hydraulic jack corresponding to the auxiliary rod is facing the retaining structure.

[0023] 6), Control the telescopic cylinder to shorten. The telescopic cylinder drives the substrate to move towards the auxiliary rod. The substrate drives the limit protrusion and the driving gear to insert into the limit groove and the limit hole respectively. At this time, the driving gear meshes with the limit hole and the tooth groove at the same time, restoring the locking of the auxiliary rod to prevent the auxiliary rod from deflecting in angle during construction. At the same time, control the telescopic rod to extend. The telescopic rod drives the positioning pin to re-insert into the positioning groove through the support block, restoring the locking between the moving section and the fixed section, thereby supporting the auxiliary rod.

[0024] 7), Excavate the second layer of soil in the foundation pit, construct the second layer of concrete support, and install the modular servo system of the second layer. Continuously repeat the above process until the construction of the foundation pit concrete support servo system is completed.

[0025] Other advantages, objectives and features of the present invention will be described in the subsequent description, and to some extent will be obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following description. Brief Description of the Drawings

[0026] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for description:

[0027] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the modular servo system in an embodiment of the present invention;

[0029] Figure 3 It is a cross-sectional view of the rear support rod in an embodiment of the present invention.

[0030] The markings in the attached drawings are as follows: enclosure structure 1, concrete support 2, main rod 3, auxiliary rod 4, hydraulic jack 5, mounting seat 6, front support plate 7, sliding section 8, fixed section 9, moving section 10, mounting seat 11, base plate 12, drive motor 13, drive gear 14, tooth groove 15, limit groove 16, support block 17, positioning groove 18, positioning pin 19, telescopic rod 20, and support 21. DETAILED DESCRIPTION

[0031] like Figures 1 to 3 As shown:

[0032] A servo system for a foundation pit concrete support 2 comprises a retaining structure 1 arranged on the side wall of the foundation pit, a concrete support 2 and a modular servo system; the concrete support 2 is provided with a plurality of openings on the side wall facing the retaining structure 1, and the openings are pre-buried with connecting seats facing the retaining structure 1 (not shown in the figure); the modular servo system comprises a main rod 3 detachably arranged on the connecting seat, the main rod 3 is arranged horizontally, and the upper and lower end surfaces of the main rod 3 are provided with auxiliary rods 4 inclined toward the retaining structure 1, and auxiliary supporting structures are provided between the auxiliary rods 4 and the main rod 3, and hydraulic jacks 5 are horizontally arranged at one end of the main rod 3 and the auxiliary rod 4 facing the retaining structure 1; the modular servo system also comprises a hydraulic servo control system for controlling the hydraulic jack 5 (existing technology, so not shown in the figure).

[0033] In this solution, the main rod 3 cooperates with the auxiliary rod 4 so that the modular servo system on a layer of concrete support 2 corresponds to three effective support points, and can simultaneously provide three-point vertical support for the enclosure structure 1. Three layers of servo systems can be vertically arranged through a single fulcrum of a single-layer concrete support, with a larger control range, more uniform vertical force on the enclosure structure, and can save a large amount of concrete horizontal support.

[0034] Furthermore, a mounting seat 6 is welded and fixed to the upper and lower end surfaces of the main rod 3, and the end of the secondary rod 4 away from the enclosure structure 1 is hinged to the mounting seat 6; the auxiliary support structure includes two front support plates 7 welded and fixed to the main shaft, the front support plates 7 are symmetrically arranged about the secondary rod 4, and the front support plates 7 are arc-shaped, and the front support plates 7 are provided with coaxial arc grooves, and the center of the front support plates 7 and the arc grooves coincide with the adjacent mounting seats 6; both sides of the secondary rod 4 are integrally formed with sliding sections 8 that are slidably connected to the arc grooves, and the sliding sections 8 are provided with a power structure for driving the sliding sections 8 to slide relative to the arc grooves.

[0035] The auxiliary rod 4 swings relative to the main rod 3 through the mounting seat 6, and the sliding section 8 is driven by a power structure to slide in the arc-shaped groove, so as to adjust the inclination angle of the auxiliary rod 4, and move the end of the auxiliary rod 4 vertically to the stress part of the retaining structure 1 to meet different construction conditions; and the arc-shaped front support plate 7 applies a traction force towards the retaining structure 1 to the auxiliary rod 4, preventing the recoil force generated by the hydraulic jack 5 from causing the auxiliary rod 4 to swing and affecting the support of the retaining structure 1.

[0036] Furthermore, the auxiliary support structure further includes a rear support rod, and the rear support rod includes a fixed section 9 and a moving section 10. A mounting seat 6 detachably connected to a connecting seat is fixed at the end of the main rod 3. One end of the fixed section 9 is hinged to the mounting seat 6, the moving section 10 is coaxially and slidably connected to the inside of the other end of the fixed section 9, and the end of the moving section 10 is hinged to the side wall of the auxiliary rod 4; a locking structure for locking the sliding of the moving section 10 relative to the fixed section 9 is provided on the fixed section 9.

[0037] In this solution, the rear support rod is composed of a relatively sliding fixed section 9 and a moving section 10, and can remain connected to the auxiliary rod 4 during the adjustment of the inclination angle of the auxiliary rod 4; when the auxiliary rod 4 is adjusted in place, the sliding of the moving section 10 relative to the fixed section 9 is restricted by the locking structure, so as to provide a supporting force for the auxiliary rod 4 and prevent the auxiliary rod 4 from bending and deflecting.

[0038] Furthermore, the power structure includes a base plate 12 coaxially and slidably arranged at the end of the sliding section 8. An expansion cylinder for driving the base plate 12 to slide is arranged on the sliding section 8. Driving motors 13 facing the auxiliary rod 4 are respectively arranged at both ends of the base plate 12. Driving gears 14 are fixed on the output ends of the driving motors 13. Tooth grooves 15 meshing with the driving gears 14 are arranged on the arc-shaped side walls of the front support plate 7. One end of the tooth groove 15 facing the auxiliary rod 4 penetrates through the front support plate 7, and the length of the tooth groove 15 is greater than the thickness of the driving gear 14. A limiting hole adapted to the outer shape of the driving gear 14 is arranged on the auxiliary rod 4; a number of limiting protrusions are fixed on the side of the base plate 12 facing the front support plate 7, and a number of limiting grooves 16 cooperating with the limiting protrusions are arranged on the side wall of the front support plate 7.

[0039] In this solution, when it is necessary to adjust the inclination angle of the auxiliary rod 4, the telescopic cylinder is controlled to extend. The telescopic cylinder drives the base plate 12 to move away from the auxiliary rod 4. The base plate 12 drives the limit protrusion and the driving gear 14 to disengage from the limit groove 16 and the limit hole respectively. At this time, the driving gear 14 only meshes with the tooth groove 15, releasing the locking of the auxiliary rod 4 and enabling the auxiliary rod 4 to swing. At this time, the driving motor 13 drives the driving gear 14 to rotate. Through the meshing between the driving gear 14 and the tooth groove 15, the sliding section 8 is driven to slide along the arc-shaped groove, thereby adjusting the inclination angle of the auxiliary rod 4 to ensure that the force-bearing part at the end of the auxiliary rod 4 is on the same horizontal line as the retaining structure 1. After the adjustment is completed, the telescopic cylinder is controlled to shorten. The telescopic cylinder drives the base plate 12 to move towards the auxiliary rod 4. The base plate 12 drives the limit protrusion and the driving gear 14 to insert into the limit groove 16 and the limit hole respectively. At this time, the driving gear 14 meshes with the limit hole and the tooth groove 15 at the same time to restore the locking of the auxiliary rod 4 and prevent the auxiliary rod 4 from deflecting in angle during construction.

[0040] Further, the locking structure includes a number of positioning grooves 18 provided on both sides of the inner wall of the fixed section 9. Installation grooves are formed on both sides of the moving section 10. Support blocks 17 are slidably connected in the installation grooves. A number of positioning pins 19 that cooperate with the positioning grooves 18 are provided on the support blocks 17. A telescopic rod 20 is provided between the support blocks 17 and the installation grooves.

[0041] When it is necessary to adjust the inclination angle of the auxiliary rod 4, the telescopic rod 20 is controlled to shorten. The telescopic rod 20 drives the positioning pin 19 to slide out of the positioning groove 18 through the support block 17, releasing the locking between the moving section 10 and the fixed section 9 and keeping the rear strut connected to the auxiliary rod 4. After the adjustment of the auxiliary rod 4 is completed, the telescopic rod 20 is controlled to extend. The telescopic rod 20 drives the positioning pin 19 to re-insert into the positioning groove 18 through the support block 17, restoring the locking between the moving section 10 and the fixed section 9, thereby supporting the auxiliary rod 4.

[0042] Further, a vertically swingable support 21 is hinged to the end of the auxiliary rod 4 facing the retaining structure 1. The hydraulic jack 5 corresponding to the auxiliary rod 4 is arranged on the support 21. A swing motor for driving the support 21 to swing is arranged on the end of the auxiliary rod 4.

[0043] The driving motor 13 drives the support 21 to swing, making the hydraulic jack 5 corresponding to the auxiliary rod 4 face the retaining structure 1 exactly, accurately controlling the axial force direction of the hydraulic jack 5, and facilitating the subsequent adjustment of the axial force of the hydraulic jack 5 through the hydraulic servo control system.

[0044] A construction method for a foundation pit concrete support 2 servo system includes the following steps:

[0045] 1) Excavate the first layer of soil in the foundation pit and erect a pile foundation for vertically supporting the concrete support 2.

[0046] 2), Tie the steel bars for pouring the concrete support 2, lay the formwork and embed the connecting seat at the opening, and then pour the first layer of the concrete support 2;

[0047] 3), After the first concrete support 2 is formed, place the modular servo system at the opening of the concrete support 2, and connect and fix the mounting seat 6 with the connecting seat;

[0048] 4), Control the telescopic cylinder to extend, the telescopic cylinder drives the base plate 12 to move away from the secondary rod 4, and the base plate 12 drives the limit protrusion and the driving gear 14 to disengage from the limit groove 16 and the limit hole respectively, releasing the locking of the secondary rod 4. At this time, the driving gear 14 only meshes with the tooth groove 15; at the same time, control the telescopic rod 20 to shorten, and the telescopic rod 20 drives the positioning pin 19 to slide out of the positioning groove 18 through the support block 17, releasing the locking between the moving section 10 and the fixed section 9;

[0049] 5), Drive the driving gear 14 to rotate through the driving motor 13, and drive the sliding section 8 to slide along the arc groove through the meshing between the driving gear 14 and the tooth groove 15, so as to adjust the inclination angle of the secondary rod 4 to ensure that the force-bearing part of the end of the secondary rod 4 and the retaining structure 1 are on the same horizontal line; at the same time, the secondary rod 4 drives the moving section 10 to slide relative to the fixed section 9; then drive the support 21 to swing through the driving motor 13, so that the hydraulic jack 5 corresponding to the secondary rod 4 is directly opposite to the retaining structure 1;

[0050] 6), Control the telescopic cylinder to shorten, the telescopic cylinder drives the base plate 12 to move towards the secondary rod 4, and the base plate 12 drives the limit protrusion and the driving gear 14 to insert into the limit groove 16 and the limit hole respectively. At this time, the driving gear 14 meshes with the limit hole and the tooth groove 15 at the same time, restoring the locking of the secondary rod 4 to prevent the secondary rod 4 from deflecting in angle during construction; at the same time, control the telescopic rod 20 to extend, and the telescopic rod 20 drives the positioning pin 19 to re-insert into the positioning groove 18 through the support block 17, restoring the locking between the moving section 10 and the fixed section 9, thereby supporting the secondary rod 4;

[0051] 7), Excavate the second layer of soil in the foundation pit, construct the second layer of concrete support 2, and install the modular servo system of the second layer; continuously repeat the above process until the construction of the servo system of the concrete support 2 in the foundation pit is completed.

[0052] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A foundation pit concrete support servo system, including a retaining structure arranged on the side wall of the foundation pit, characterized in that: It also includes a concrete support and a modular servo system; several openings facing the retaining structure are provided on the side wall of the concrete support, and connecting seats are embedded at the openings; the modular servo system includes a main rod detachably arranged on the connecting seat, the main rod is horizontally arranged, auxiliary rods inclined towards the retaining structure are arranged on the upper and lower end faces of the main rod, an auxiliary support structure is arranged between the auxiliary rods and the main rod, hydraulic jacks are horizontally arranged at one ends of the main rod and the auxiliary rods facing the retaining structure; the modular servo system also includes a hydraulic servo control system for controlling the hydraulic jacks; mounting seats are arranged on the upper and lower end faces of the main rod, and one ends of the auxiliary rods far from the retaining structure are hinged to the mounting seats; the auxiliary support structure includes two arc-shaped front support plates symmetrically arranged with respect to the auxiliary rod, the front support plates are fixedly connected to the main rod, arc-shaped grooves are provided on the front support plates, and the centers of the front support plates coincide with the adjacent mounting seats; sliding sections slidingly connected to the arc-shaped grooves are fixed on both sides of the auxiliary rod, and a power structure for driving the sliding sections to slide relative to the arc-shaped grooves is arranged on the sliding sections.

2. The foundation pit concrete support servo system according to claim 1, characterized in that: The auxiliary support structure also includes a rear support rod, and the rear support rod includes a fixed section and a moving section. A mounting seat detachably connected to the connecting seat is fixed at the end of the main rod. One end of the fixed section is hinged to the mounting seat, the moving section is coaxially and slidably connected to the inside of the other end of the fixed section, and the end of the moving section is hinged to the side wall of the auxiliary rod; a locking structure for locking the relative sliding of the moving section with respect to the fixed section is arranged on the fixed section.

3. The foundation pit concrete support servo system according to claim 2, characterized in that: The power structure includes a base plate slidably arranged coaxially at the end of the sliding section. An expansion cylinder for driving the base plate to slide is arranged on the sliding section. When the expansion cylinder extends, the expansion cylinder drives the base plate to move away from the auxiliary rod. Driving motors facing the auxiliary rod are respectively arranged at both ends of the base plate, driving gears are fixed on the output ends of the driving motors, tooth grooves meshing with the driving gears are arranged on the arc-shaped side walls of the front support plates, the tooth grooves penetrate through the front support plates at one ends facing the auxiliary rod, and the length of the tooth grooves is greater than the thickness of the driving gears; a limiting hole adapted to the outer shape of the driving gear is arranged on the auxiliary rod; several limiting protrusions are fixed on one side of the base plate facing the front support plate, and several limiting grooves cooperating with the limiting protrusions are arranged on the side wall of the front support plate.

4. The foundation pit concrete support servo system according to claim 3, characterized in that: The locking structure includes several positioning grooves arranged on both sides of the inner wall of the fixed section. Mounting grooves are opened on both sides of the moving section, support blocks are slidably connected in the mounting grooves, positioning pins cooperating with the positioning grooves are arranged on the support blocks, and expansion rods are arranged between the support blocks and the mounting grooves.

5. The foundation pit concrete support servo system according to claim 4, characterized in that: A vertically swingable support is hinged to the end of the auxiliary rod facing the retaining structure, the hydraulic jack corresponding to the auxiliary rod is arranged on the support, and a swing motor for driving the support to swing is arranged at the end of the auxiliary rod.

6. The construction method of the foundation pit concrete support servo system according to claim 5, characterized in that, It includes the following steps: 1) Excavate the first layer of soil in the foundation pit and erect a pile foundation for vertically supporting the concrete support; 2) Bind the steel bars for pouring the concrete support, lay the formwork and embed the connecting seats at the openings, and then pour the first layer of concrete support; 3), After the first concrete support is poured and formed, place the modular servo system at the opening of the concrete support, and connect and fix the mounting seat and the connecting seat; 4), Control the telescopic cylinder to extend. The telescopic cylinder drives the substrate to move away from the secondary rod. The substrate drives the limit protrusion and the driving gear to disengage from the limit groove and the limit hole respectively, releasing the locking of the secondary rod. At this time, the driving gear only meshes with the tooth groove. At the same time, control the telescopic rod to shorten. The telescopic rod drives the positioning pin to slide out of the positioning groove through the support block, releasing the locking between the moving section and the fixed section; 5), Drive the driving gear to rotate through the driving motor. Through the meshing between the driving gear and the tooth groove, drive the sliding section to slide along the arc groove, so as to adjust the inclination angle of the secondary rod and ensure that the end of the secondary rod and the stress part of the retaining structure are on the same horizontal line. At the same time, the secondary rod drives the moving section to slide relative to the fixed section. Then drive the support to swing through the driving motor, so that the hydraulic jack corresponding to the secondary rod is directly facing the retaining structure; 6), Control the telescopic cylinder to shorten. The telescopic cylinder drives the substrate to move towards the secondary rod. The substrate drives the limit protrusion and the driving gear to insert into the limit groove and the limit hole respectively. At this time, the driving gear meshes with the limit hole and the tooth groove at the same time, restoring the locking of the secondary rod to prevent the secondary rod from deflecting in angle during construction. At the same time, control the telescopic rod to extend. The telescopic rod drives the positioning pin to re-insert into the positioning groove through the support block, restoring the locking between the moving section and the fixed section, so as to support the secondary rod; 7), Excavate the second layer of soil in the foundation pit, construct the second layer of concrete support, and install the modular servo system of the second layer. Continuously repeat the above process until the construction of the foundation pit concrete support servo system is completed.

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