A foundation pit supporting device based on prestressed beam

Abstract

The application discloses a kind of based on prestressed beam's foundation pit supporting device, solve the baffle for protection in existing device is not adapted to the foundation pit of different topography, so that the problem that baffle cannot adapt to variable foundation pit environment, device includes: foundation pit supporting main body, the foundation pit supporting main body includes foundation pit supporting beam;Protection adjusting mechanism, the protection adjusting mechanism is set on the foundation pit supporting beam, and with the support extension component of protection adjusting mechanism cooperation work, the support extension component is also installed on foundation pit supporting beam;Protection adjusting mechanism includes protection adjusting beam, adjusting load-bearing arm and support angle change part;In the present application, there is protection adjusting beam, adjusting load-bearing arm and support angle change part for adjusting the inclination angle of the protection adjusting beam, support frame change part is set to protection adjusting beam, to realize the expansion and shrinkage of support range in turn, and protection adjusting beam can work independently, disassembly and assembly are convenient, and it is beneficial to popularization and application.

Description

Technical Field

[0001] This invention specifically relates to a foundation pit support device based on prestressed beams. Background Technology

[0002] In the construction of deep foundation pit projects, problems such as ground structure settlement and deformation, and lateral displacement of the support structure often occur. In order to improve the stability of deep foundation pits, it is often necessary to take some foundation pit support measures. Currently, the commonly used support forms include concrete retaining piles, combinations of reinforced concrete internal support beams and retaining piles, and combinations of retaining piles and transverse reinforcements.

[0003] Chinese patent CN211773706U discloses a foundation pit support device, characterized in that it includes a baffle, diagonal braces, and support piers. The baffle has several linearly arrayed insertion rods and slots at its upper and lower ends, symmetrically arranged. One insertion rod on one baffle is connected to a slot on another baffle. The baffle has several slots and insertion rods on its left and right sides, symmetrically arranged. One insertion rod on one baffle is connected to a slot on another baffle. However, existing baffles used for protection are not suitable for foundation pits with different terrains, making them unable to adapt to the changing foundation pit environment. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a foundation pit support device based on prestressed beams. This solves the problem that the protective baffles used in existing devices are not suitable for foundation pits with different terrains, making it impossible for the baffles to adapt to the changing foundation pit environment.

[0005] Existing foundation pit protection devices, such as protective barriers, are not suitable for foundation pits with different terrains, making them unable to adapt to the changing foundation pit environment. In short, to solve the above problems, we propose a foundation pit support device based on prestressed beams. This device includes: a foundation pit support body, comprising a foundation pit support beam; an adjustable support range protection mechanism mounted on the foundation pit support beam; and a support extension component that works in conjunction with the protection adjustment mechanism, also mounted on the foundation pit support beam. During operation, the support extension component can be specifically installed on the foundation pit support beam according to specific terrain and environment. The support extension component extends the support range of this application without requiring additional large pile foundations. Furthermore, the cooperation between the protection adjustment mechanism and the support extension component further adapts to changing terrains, expanding the application terrain range of this application.

[0006] This invention is implemented as follows: a foundation pit support device based on prestressed beams, the foundation pit support device based on prestressed beams comprising:

[0007] The foundation pit support structure includes a foundation pit support beam.

[0008] An adjustable support range protection adjustment mechanism is provided, which is mounted on the foundation pit support beam.

[0009] A support extension assembly that works in conjunction with the protective adjustment mechanism is also installed on the foundation pit support beam;

[0010] The protective adjustment mechanism includes a protective adjustment beam, an adjustment load-bearing arm, and a support angle changing part for adjusting the tilt angle of the protective adjustment beam. The protective adjustment beam and the adjustment load-bearing arm are rotatably connected. The adjustment load-bearing arm is detachably installed on the foundation pit support beam. The support angle changing part is set on the foundation pit support beam and connected to the protective adjustment beam.

[0011] Preferably, the foundation pit support body further includes beam reinforcement sections for enhancing the strength of the foundation pit support beams, and at least one set of beam reinforcement sections is provided, the beam reinforcement sections including:

[0012] At least one set of prestressed seats is fixedly installed on the foundation pit support beam. The prestressed seats are hollow inside and are used to fill concrete to enhance the strength of the foundation pit support beam.

[0013] Preferably, the beam reinforcement further includes:

[0014] At least one set of stress connection seats, wherein the stress connection seats pass through the prestressing seat and are in communication with the prestressing seat;

[0015] A grouting port is provided at one end of the stress connection seat. The grouting port is used for auxiliary grouting of the stress connection seat and the prestressed seat.

[0016] Preferably, the protective adjustment beam comprises:

[0017] At least one set of reinforcing protrusions is fixedly mounted on the protective adjustment beam;

[0018] The arc-shaped polishing seats are located on both sides of the protective adjustment beam. The surface of the arc-shaped polishing seats is polished to prevent soil accumulation.

[0019] Preferably, the protective adjustment beam further includes:

[0020] An auxiliary reinforcing seat is provided at the end of the protective adjustment beam to enhance the strength of the protective adjustment beam.

[0021] Preferably, the support angle changing part includes:

[0022] Change the driver;

[0023] A changing screw is provided on one side of the changing drive component, and the changing screw is rotatably mounted on the foundation pit support beam;

[0024] Adjusting sleeve that changes the angle of the screw via a threaded connection.

[0025] Preferably, the support angle changing part further includes:

[0026] The hinge seat is fixedly installed on the protective adjustment beam, and a hinge block is slidably arranged inside the hinge seat. The hinge block is hinged to the angle adjustment sleeve.

[0027] Preferably, the support extension component includes:

[0028] A support extension seat that is slidably connected to the foundation pit support beam, wherein at least one set of the support extension seat is provided;

[0029] An extension connection portion is provided on one side of the support extension base;

[0030] Adjustment follower connected to the extended connection part;

[0031] An adjusting transmission component sleeved on the adjusting driven component, wherein the adjusting driven component and the adjusting driven component are connected by threads, and

[0032] An adjustment drive component is installed on the foundation pit support beam, and the adjustment drive component is fixedly connected to the adjustment transmission component.

[0033] Preferably, the support extension seat has at least one set of support extension grooves, and a pre-filled plate is provided in the adjacent support extension grooves. The two sides of the pre-filled plate are detachably connected to the support extension seat.

[0034] Preferably, the extended connecting portion includes:

[0035] An extension connector is slidably mounted on an adjusting follower, and the adjusting follower has multiple sets of extension guide grooves for limiting the position of the extension connector.

[0036] A connecting sealing seat is sleeved on the extended connecting seat. The connecting sealing seat is slidably connected to the adjusting follower, and the connecting sealing seat and the adjusting follower are fixedly connected by fastening screws. At least one set of fastening screws is provided and is provided in the extended guide groove.

[0037] Compared with the prior art, the embodiments of this application have the following main advantages:

[0038] This application includes a protective adjustment beam, an adjustable load-bearing arm, and a support angle changing part for adjusting the tilt angle of the protective adjustment beam. The support angle changing part is provided corresponding to the protective adjustment beam, which can flexibly adjust the swing position of the protective adjustment beam, thereby realizing the expansion and reduction of the support range. Moreover, the protective adjustment beam can work independently, is easy to disassemble and assemble, and is conducive to widespread application. Attached Figure Description

[0039] Figure 1 This is a structural schematic diagram of a foundation pit support device based on a prestressed beam provided by the present invention.

[0040] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0041] Figure 3 This is the front view of the present invention.

[0042] Figure 4 This is a rear view of the present invention.

[0043] Figure 5 This is a side view of the present invention.

[0044] Figure 6 This is a top view of the present invention.

[0045] Figure 7 This is a schematic diagram of the protective adjustment mechanism provided by the present invention.

[0046] Figure 8 This is a schematic diagram of the structure of the support extension component provided by the present invention.

[0047] Figure 9 This is a three-dimensional structural diagram of the support and extension component provided by the present invention.

[0048] Figure 10 This is the front view of the support extension component provided by the present invention.

[0049] Figure 11 This is a side view of the support extension component provided by the present invention.

[0050] In the picture:

[0051] 1-Main structure of foundation pit support;

[0052] 11-Foundation pit support beam; 12-Beam reinforcement section;

[0053] 121-Prestressed seat, 122-Stressed connection seat, 123-Grouting port;

[0054] 2-Supporting extension components;

[0055] 21-Adjusting drive component, 22-Adjusting transmission component, 23-Adjusting driven component, 24-Extended connecting part, 25-Supporting extension seat;

[0056] 241-Connecting sealing seat, 242-Extended guide groove, 243-Extended connecting seat, 251-Supporting extended groove, 252-Prefill plate;

[0057] 3-Protective adjustment mechanism;

[0058] 31-Protective adjustment beam, 32-Adjustable load-bearing arm, 33-Support angle changing part;

[0059] 311-Reinforcing bump, 312-Auxiliary reinforcing seat, 313-Arc polishing seat, 331-Change driving component, 332-Change screw, 333-Angle adjusting sleeve, 334-Change hinge seat. Detailed Implementation

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] Existing foundation pit protection devices using protective baffles are not suitable for foundation pits with different terrains, making them unable to adapt to the changing foundation pit environment. In short, to solve the above problems, we propose a foundation pit support device based on prestressed beams. This device includes: a foundation pit support body 1, comprising a foundation pit support beam 11; an adjustable support range protection adjustment mechanism 3, mounted on the foundation pit support beam 11; and a support extension component 2 that works in conjunction with the protection adjustment mechanism 3, also mounted on the foundation pit support beam 11. During operation, the support extension component 2 can be specifically installed on the foundation pit support beam 11 according to specific terrain and environment. The support extension component 2 can extend the support range of this application without requiring additional large pile foundations. Furthermore, the cooperation between the protection adjustment mechanism 3 and the support extension component 2 further adapts to changing terrains, expanding the application terrain range of this application.

[0063] This invention provides a foundation pit support device based on prestressed beams, such as... Figure 1-6 As shown, the foundation pit support device based on prestressed beams includes:

[0064] The foundation pit support body 1 includes a foundation pit support beam 11.

[0065] It should be noted that the shape of the foundation pit support beam 11 can be circular, fan-shaped, rectangular or other shapes, and the foundation pit support beam 11 is a precast prefabricated structure. Its interior can be filled with lightweight concrete, and reinforced steel bars are set around the foundation pit support beam 11. The entire foundation pit support beam 11 does not require on-site construction, and the foundation pit support beam 11 is easy to disassemble. It can also be divided into two parts and connected by connecting tenons and rivets. At the same time, the foundation pit support beam 11 has multiple sets of connecting grooves in the circumferential direction, and connecting anchor rods are set in the connecting grooves. Adjacent foundation pit support beams 11 can be fixedly connected by multiple sets of connecting anchor rods.

[0066] An adjustable support range protection adjustment mechanism 3 is provided on the foundation pit support beam 11, and

[0067] The support extension component 2 works in conjunction with the protective adjustment mechanism 3, and the support extension component 2 is also installed on the foundation pit support beam 11;

[0068] The protective adjustment mechanism 3 includes a protective adjustment beam 31, an adjustment load-bearing arm 32, and a support angle changing part 33 for adjusting the tilt angle of the protective adjustment beam 31. The protective adjustment beam 31 and the adjustment load-bearing arm 32 are rotatably connected. The adjustment load-bearing arm 32 is detachably installed on the foundation pit support beam 11. The support angle changing part 33 is set on the foundation pit support beam 11 and connected to the protective adjustment beam 31.

[0069] For example, the protective adjustment beam 31 can be a fan-shaped plate, an arc plate or a rectangular plate, one end of which is fixedly connected to the adjustment load-bearing arm 32 through a bearing. The protective adjustment beam 31 is evenly distributed on the foundation pit support beam 11 in a circumferential direction and can be used alone, while the adjustment load-bearing arm 32 is fixedly connected to the foundation pit support beam 11 through rivets and bolts.

[0070] In this embodiment, during operation, the support extension component 2 can be installed on the foundation pit support beam 11 according to the specific terrain and environment. The support extension component 2 can extend the support range of this application without the need for additional large pile foundations. At the same time, the protective adjustment mechanism 3 works in conjunction with the support extension component 2 to further adapt to the changing terrain and expand the application terrain range of this application.

[0071] This application includes a protective adjustment beam 31, an adjustable load-bearing arm 32, and a support angle changing part 33 for adjusting the tilt angle of the protective adjustment beam 31. The support angle changing part is provided corresponding to the protective adjustment beam 31, which can flexibly adjust the swing position of the protective adjustment beam 31, thereby realizing the expansion and reduction of the support range. Moreover, the protective adjustment beam 31 can work independently, is easy to disassemble and assemble, and is conducive to widespread application.

[0072] Considering the low strength of existing baffles, in order to enhance the stability within the foundation pit, in a further preferred embodiment of the present invention, such as... Figure 1-4 As shown, the foundation pit support body 1 also includes a beam reinforcement section 12 for enhancing the strength of the foundation pit support beam 11. At least one set of beam reinforcement sections 12 is provided, and each beam reinforcement section 12 includes:

[0073] At least one set of prestressed seats 121 are fixedly installed on the foundation pit support beam 11. The prestressed seats 121 are hollow inside and are used to fill concrete to enhance the strength of the foundation pit support beam 11.

[0074] At least one set of stress connection seats 122, wherein the stress connection seats 122 penetrate the prestressed seat 121 and are in communication with the prestressed seat 121;

[0075] A grouting port 123 is provided at one end of the stress connection seat 122. The grouting port 123 is used for auxiliary grouting of the stress connection seat 122 and the prestressed seat 121.

[0076] In this embodiment, the prestressed seat 121 can be a steel seat or a steel ring, and the prestressed seat 121 is circumferentially provided with multiple sets of detection grooves. The detection grooves are used by concrete strength testing equipment to fully test the strength of the concrete poured in the prestressed seat 121, thereby ensuring the support strength of the prestressed seat 121. The prestressed seat 121 is horizontally set in the foundation pit support beam 11, and the distance between adjacent prestressed seats 121 can be 0.8-1.5m. At the same time, the stress connection seat 122 is circumferentially set in the foundation pit protection beam. The stress connection seat 122 can be a rectangular seat or a circular seat, and its interior is also hollow. The stress connection seat 122 works in conjunction with the prestressed seat 121 to ensure the strength of the foundation pit support beam 11 and avoid breakage or fracture.

[0077] In complex and ever-changing environments, the strength requirements for the protective adjustment beam 31 are relatively high. To further ensure the safety of the construction site, in a further preferred embodiment of the present invention, such as... Figure 1 and 7 As shown, the protective adjustment beam 31 includes:

[0078] At least one set of reinforcing protrusions 311 are fixedly mounted on the protective adjustment beam 31;

[0079] The arc-shaped polishing seats 313 are located on both sides of the protective adjustment beam 31. The surface of the arc-shaped polishing seats 313 is polished to prevent soil accumulation.

[0080] An auxiliary reinforcing seat 312 is provided at the end of the protective adjusting beam 31 to enhance the strength of the protective adjusting beam 31.

[0081] In this embodiment, the reinforcing protrusion 311 can be an arc-shaped block or a rectangular block, made of wear-resistant ABS or PVC material. The reinforcing protrusion 311 is evenly distributed on the protective adjustment beam 31, while the arc-shaped polishing seat 313 has a groove-shaped structure, which can prevent the accumulation of soil. The auxiliary reinforcing seat 312 and the protective adjustment beam 31 are integrally connected. The auxiliary reinforcing seat 312 is made of elastomer material, and its edge can be a thin sheet, so that the auxiliary reinforcing seat 312 can be inserted into the pit, further ensuring the stability of this application.

[0082] In a further preferred embodiment of the present invention, such as Figure 1 and 7 As shown, the support angle changing part 33 includes:

[0083] Change driver 331;

[0084] A changing screw 332 is provided on one side of the changing drive component 331, and the changing screw 332 is rotatably mounted on the foundation pit support beam 11;

[0085] An angle-adjusting sleeve 333 is connected to the screw 332 via a threaded connection.

[0086] The hinge seat 334 is fixedly installed on the protective adjustment beam 31, and a hinge block is slidably arranged inside the hinge seat 334. The hinge block is hinged to the angle adjustment sleeve 333.

[0087] In this embodiment, the change drive component 331 can be a wheel with anti-slip threads on its surface, and a preset groove is provided on one side. The preset groove is hexagonal or pentagonal, so that the change drive component 331 can be rotated by the sleeve, which facilitates the adjustment of the tilt angle of the protective adjustment beam 31.

[0088] The screw 332 and the drive component 331 are fixedly connected by welding or riveting. The screw 332 is rotatably mounted inside the foundation pit protection beam via bearings. During operation, when it is necessary to adjust the swing angle of the protection adjustment beam 31, the drive component 331 is rotated. The drive component 331 drives the screw 332 to rotate, and the screw 332 drives the angle adjustment sleeve 333 to move. This causes the adjustment sleeve to push the hinge block to slide, and the hinge block pushes the hinge seat 334 and the protection adjustment beam 31 to swing, thereby realizing the adjustment of the swing angle of the protection adjustment beam 31.

[0089] In a further preferred embodiment of the present invention, such as Figure 2 , 8 As shown in Figure -11, the support extension component 2 includes:

[0090] A support extension seat 25 is slidably connected to the foundation pit support beam 11, and at least one set of the support extension seat 25 is provided;

[0091] An extension connection portion 24 is provided on one side of the support extension base 25;

[0092] Adjustment follower 23 connected to extension connection 24;

[0093] An adjusting transmission member 22 is sleeved on the adjusting driven member 23, and the adjusting driven member 23 is connected to the adjusting driven member 23 by a thread.

[0094] Adjustment drive component 21 is installed on the foundation pit support beam 11, and adjustment drive component 21 is fixedly connected to adjustment transmission component 22.

[0095] In this embodiment, at least one set of support extension grooves 251 are provided on the support extension seat 25, and a pre-filling plate 252 is provided in the adjacent support extension grooves 251. The two sides of the pre-filling plate 252 are detachably connected to the support extension seat 25. It should be noted that the support extension grooves 251 are symmetrically arranged in the support extension seat 25. The support extension seat 25 is made of stainless steel or high manganese steel. The pre-filling plate 252 can be an arc-shaped plate or a rectangular plate, and its shape depends on the support extension seat 25. At the same time, the pre-filling plate 252 is fixedly connected to the support extension seat 25 by tenon or riveting.

[0096] For example, the support extension seat 25 is circumferentially arranged on one side of the foundation pit support beam 11. The support extension seat 25 can be a hollow round seat or a rectangular seat. At the same time, the support extension seat 25 is fixedly connected to the extension connection part 24. The adjustment transmission component 22 is a threaded rod, the adjustment driven component 23 can be an internally threaded sleeve, and the adjustment drive component 21 and the adjustment driven component 23 can be fixedly connected by welding or riveting. The adjustment drive component 21 is rotatably mounted on the side wall of the foundation pit support beam 11.

[0097] When it is necessary to adjust the horizontal position of the support extension seat 25 during operation, the adjustment drive member 21 is rotated, and the adjustment drive member 21 drives the adjustment transmission member 22 to rotate, thereby causing the adjustment transmission member 22 to drive the adjustment follower member 23, the extension connection part 24 and the support extension seat 25 to move horizontally, thereby realizing the adjustment of the support range of the support extension seat 25.

[0098] like Figure 8 As shown, the extended connecting portion 24 includes:

[0099] An extension connector 243 is slidably mounted on an adjusting follower 23, and the adjusting follower 23 has multiple sets of extension guide grooves 242 for limiting the position of the extension connector 243.

[0100] A connecting sealing seat 241 is sleeved on the extended connecting seat 243. The connecting sealing seat 241 is slidably connected to the adjusting follower 23, and the connecting sealing seat 241 and the adjusting follower 23 are fixedly connected by fastening screws. At least one set of fastening screws is provided and is provided in the extended guide groove 242.

[0101] The extension connecting seat 243 is a round or rectangular seat with three, four, or six sets of sliding seats on its side wall, and the number of sets of the extension guide groove 242 is the same. At the same time, the fastening screw is rotatably connected to the extension guide groove 242 through a bearing, and the fastening screw is threadedly connected to the connecting sealing seat 241. During installation or disassembly, only the fastening screw needs to be rotated to realize the installation and disassembly of the support extension seat 25, which facilitates the use of the support extension assembly 2.

[0102] In summary, the present invention provides a foundation pit support device based on prestressed beams. During operation, support extension components 2 can be installed on the foundation pit support beam 11 according to specific terrain and environment. The support extension components 2 can extend the support range of this application without the need for additional pre-set large pile foundations. At the same time, the protective adjustment mechanism 3 works in conjunction with the support extension components 2 to further adapt to changing terrain and expand the application terrain range of this application.

[0103] When it is necessary to adjust the swing angle of the protective adjustment beam 31 during operation, the change drive 331 is rotated, which drives the change screw 332 to rotate. The change screw 332 drives the angle adjustment sleeve 333 to move, thereby causing the adjustment sleeve to push the hinge block to slide. The hinge block pushes the change hinge seat 334 and the protective adjustment beam 31 to swing, thus realizing the adjustment of the swing angle of the protective adjustment beam 31.

[0104] When it is necessary to adjust the extension range of this application so that the support extension component 2 and the protective adjustment mechanism 3 work together, when it is necessary to adjust the horizontal position of the support extension seat 25 during operation, the adjustment drive component 21 is rotated. The adjustment drive component 21 drives the adjustment transmission component 22 to rotate, thereby causing the adjustment transmission component 22 to drive the adjustment follower component 23, the extension connection part 24 and the support extension seat 25 to move horizontally, thereby realizing the adjustment of the support range of the support extension seat 25.

[0105] This application includes a protective adjustment beam 31, an adjustable load-bearing arm 32, and a support angle changing part 33 for adjusting the tilt angle of the protective adjustment beam 31. The support angle changing part is provided corresponding to the protective adjustment beam 31, which can flexibly adjust the swing position of the protective adjustment beam 31, thereby realizing the expansion and reduction of the support range. Moreover, the protective adjustment beam 31 can work independently, is easy to disassemble and assemble, and is conducive to widespread application.

[0106] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0107] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; the division of units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0108] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0109] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A foundation pit support device based on prestressed beams, the foundation pit support device based on prestressed beams comprising: The foundation pit support structure includes a foundation pit support beam. Its characteristic is that it further includes a protective adjustment mechanism with an adjustable support range, the protective adjustment mechanism being disposed on the foundation pit support beam, and A support extension assembly that works in conjunction with the protective adjustment mechanism is also installed on the foundation pit support beam; The protective adjustment mechanism includes a protective adjustment beam, an adjustment load-bearing arm, and a support angle changing part for adjusting the tilt angle of the protective adjustment beam. The protective adjustment beam and the adjustment load-bearing arm are rotatably connected. The adjustment load-bearing arm is detachably installed on the foundation pit support beam. The support angle changing part is set on the foundation pit support beam and connected to the protective adjustment beam. The support extension component includes: A support extension seat that is slidably connected to the foundation pit support beam, wherein at least one set of the support extension seat is provided; An extension connection portion is provided on one side of the support extension base; Adjustment follower connected to the extended connection part; An adjusting transmission member is sleeved on the adjusting driven member, and the adjusting driven member and the adjusting transmission member are connected by a thread. An adjustment drive component is installed on the foundation pit support beam, and the adjustment drive component is fixedly connected to the adjustment transmission component.

2. The foundation pit support device based on prestressed beams as described in claim 1, characterized in that: The foundation pit support body also includes beam reinforcement sections for enhancing the strength of the foundation pit support beams. At least one set of beam reinforcement sections is provided, and each beam reinforcement section includes: At least one set of prestressed seats is fixedly installed on the foundation pit support beam. The prestressed seats are hollow inside and are used to fill concrete to enhance the strength of the foundation pit support beam.

3. The foundation pit support device based on prestressed beams as described in claim 2, characterized in that: The beam reinforcement also includes: At least one set of stress connection seats, wherein the stress connection seats pass through the prestressing seat and are in communication with the prestressing seat; A grouting port is provided at one end of the stress connection seat. The grouting port is used for auxiliary grouting of the stress connection seat and the prestressed seat.

4. The foundation pit support device based on prestressed beams as described in any one of claims 1-3, characterized in that: The protective adjustment beam includes: At least one set of reinforcing protrusions is fixedly mounted on the protective adjustment beam; The arc-shaped polishing seats are located on both sides of the protective adjustment beam. The surface of the arc-shaped polishing seats is polished to prevent soil accumulation.

5. The foundation pit support device based on prestressed beams as described in claim 4, characterized in that: The protective adjustment beam also includes: An auxiliary reinforcing seat is provided at the end of the protective adjustment beam to enhance the strength of the protective adjustment beam.

6. The foundation pit support device based on prestressed beams as described in claim 5, characterized in that: The support angle changing part includes: Change the driver; A changing screw is provided on one side of the changing drive component, and the changing screw is rotatably mounted on the foundation pit support beam; Adjusting sleeve that changes the angle of the screw via a threaded connection.

7. The foundation pit support device based on prestressed beams as described in claim 6, characterized in that: The support angle changing part further includes: The hinge seat is fixedly installed on the protective adjustment beam, and a hinge block is slidably arranged inside the hinge seat. The hinge block is hinged to the angle adjustment sleeve.

8. The foundation pit support device based on prestressed beams as described in claim 7, characterized in that: The support extension seat has at least one set of support extension grooves, and a pre-filled plate is provided in the adjacent support extension grooves. The two sides of the pre-filled plate are detachably connected to the support extension seat.

9. The foundation pit support device based on prestressed beams as described in claim 8, characterized in that: The extended connecting portion includes: An extension connector is slidably mounted on an adjusting follower, and the adjusting follower has multiple sets of extension guide grooves for limiting the position of the extension connector. A connecting sealing seat is sleeved on the extended connecting seat. The connecting sealing seat is slidably connected to the adjusting follower, and the connecting sealing seat and the adjusting follower are fixedly connected by fastening screws. At least one set of fastening screws is provided and is provided in the extended guide groove.

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