A safety protection structure and method for supporting foundation pits in civil engineering

Abstract

The present invention discloses a safety protection structure and method for supporting a foundation pit in a civil engineering project, comprising a main foundation pit support mechanism and a secondary foundation pit mechanism, wherein a pre-tightened anchor rod assembly is fixedly connected between the secondary foundation pit mechanism and the main foundation pit support mechanism, and the secondary foundation pit mechanism is arranged around the main foundation pit support mechanism; the main foundation pit support mechanism comprises a construction pit, the side walls of which are provided with support walls; the secondary foundation pit mechanism comprises an auxiliary pit, the bottom surface of the auxiliary pit inner cavity is provided with an oblique support unit; the oblique support unit is fixedly connected to the support wall via the anchor rod assembly; a transverse support unit is detachably connected between two opposing support walls, and a crown beam is laid on the top surface of the construction pit and the top surface of the auxiliary pit, respectively, and the two crown beams are fixedly connected by a plurality of connecting beams. The structure can prevent the construction pit from collapsing due to external forces, and can also ensure the safety of construction by well supporting the construction pit.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a safety protection structure and method for supporting a foundation pit in a civil engineering project. Background Art

[0002] The construction of deep foundation pits in modern civil engineering often faces many complex challenges. The surrounding environment is complex, with busy above-ground and underground traffic arteries or thoroughfares, existing buildings and various ancillary pipelines, as well as erosion caused by the humid and permeable geological environment. This poses a huge challenge to the excavation and construction of the foundation pit during construction. The foundation pit slope support must not only ensure that personnel operating in the foundation pit can work normally and safely, but also prevent the collapse of the soil on the side walls and top of the foundation pit to ensure the normal progress of the foundation pit construction. Therefore, the construction of foundation pits in locations with loose geological conditions along traffic arteries faces frequent vibrations and the collapse of the foundation pit caused by moisture and permeability, which can lead to loose geological conditions. This affects the safety of construction personnel and slows down the construction progress. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention proposes a safety protection structure and method for civil engineering foundation pit support, which can prevent the collapse of the construction pit due to external forces, and can also ensure the safety of construction by well supporting the construction pit.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A safety protection structure for supporting a foundation pit in a civil engineering project comprises a main foundation pit supporting mechanism and a secondary foundation pit mechanism, wherein a pre-tightened anchor rod assembly is fixedly connected between the secondary foundation pit mechanism and the main foundation pit supporting mechanism, and the secondary foundation pit mechanism is arranged on the periphery of the main foundation pit supporting mechanism; the main foundation pit supporting mechanism comprises a construction pit, and a supporting wall is provided on the side wall of the construction pit; the secondary foundation pit mechanism comprises an auxiliary pit, and an oblique support unit is provided on the bottom surface of the inner cavity of the auxiliary pit; the oblique support unit is fixedly connected to the supporting wall through the anchor rod assembly; a transverse support unit is detachably connected between two opposing supporting walls, and crown beams are respectively laid on the top surface of the construction pit and the top surface of the auxiliary pit, and the two crown beams are fixedly connected by a number of connecting beams.

[0006] Preferably, the oblique support unit includes a plurality of rotary jet piles, and the plurality of rotary jet piles are embedded in the bottom of the auxiliary pit. The rotary jet piles are arranged in a plurality of rows, and the rotary jet piles in adjacent rows are staggered. An oblique support is fixed to the top of the rotary jet pile, and the oblique support is fixedly connected to the retaining wall through the anchor rod assembly.

[0007] Preferably, the anchor rod assembly includes an inclined rod, one end of the inclined rod passes through the supporting wall and is fixedly connected to the supporting wall, the other end of the inclined rod passes through and is slidably connected to a connecting column, one end face of the connecting column is provided with a conical hole, and the conical hole is provided with an arc-shaped fitting piece adapted to the inner wall of the conical hole, one end of the fitting piece is fixedly connected to the other end face of the inclined rod, and the other end of the fitting piece is fixedly connected to a limiting piece, and the limiting piece is detachably connected to the end face of the connecting column, a rubber pad is sandwiched between the two fitting pieces, and a sensor group capable of detecting soil moisture and the pressure exerted on the rubber pad is embedded in the rubber pad; an extension column is screwed to the end face of the connecting column, and the extension column is fixedly connected to the top surface of the inclined support.

[0008] Preferably, a plurality of guide slots are provided on one side of the support wall, and the guide slots are detachably connected to the transverse support units; the guide slots pass through the top and bottom surfaces of the support wall.

[0009] Preferably, the horizontal support unit includes a sliding end, the sliding end is detachably connected to the guide slide, one end face of the sliding end is rotatably connected to the inclined beam, one end face of the inclined beam is provided with a plurality of sockets, an adjusting block is slidably connected between the two inclined beams, the two side faces of the adjusting block are respectively adapted to the end faces of the inclined beam, the two side faces and the top surface of the adjusting block are respectively provided with sliding holes and slots, and the sliding holes and the slots are connected; a latch is slidably connected in the sliding hole, one end of the latch is detachably connected to the socket, the other end of the latch is rotatably connected to a push rod, one end of the two push rods is hinged to each other, the hinge shafts of the two push rods are fixedly connected to a pull rope, the top of the pull rope is fixedly connected to a push plate, and the push plate is slidably connected to the slot.

[0010] Preferably, there are several auxiliary pits, and the several auxiliary pits are respectively arranged on the peripheral sides of the construction pit and close to the direction of the external vibration source.

[0011] Preferably, several of the auxiliary pits are either independently arranged around the construction pit, or are interconnected and arranged to surround the construction pit.

[0012] Preferably, several rows of the jet grouting piles are buried in the bottom of the construction pit, and each row of the jet grouting piles is arranged perpendicular to each row of the jet grouting piles in the auxiliary pit; the top of the jet grouting piles in the construction pit is fixedly connected to a foundation plate, and the surrounding side of the foundation plate is fixedly connected to the support wall.

[0013] A safety protection method for civil engineering foundation pit support, comprising the following steps:

[0014] S1. Laying out auxiliary pits: Dig auxiliary pits and lay crown beams on top of the auxiliary pits and the construction pits. Set up auxiliary pits between the preset position of the construction pits and the external vibration source, and bury vibration detection devices in the auxiliary pits.

[0015] S2. Auxiliary pit construction: bury jet grouting piles at the bottom of the auxiliary pit and cast oblique supports. Preset anchor rod assemblies on the top of the oblique supports, with the other end of the anchor rod assembly penetrating the side wall of the auxiliary pit;

[0016] S3. Laying out the construction pit: Using the crown beams laid on the top of the auxiliary pit and the construction pit and the connecting beams between the two crown beams to harden the construction site, the construction pit is excavated;

[0017] S4. Construction pit construction: Jet grouting piles are buried at the bottom of the construction pit, and support walls are set up on the side walls of the construction pit and fixedly connected to the anchor rod assembly. Then, a foundation plate is cast at the bottom of the construction pit, and the support wall and the jet grouting piles are connected as a whole;

[0018] S5. Horizontal support: connect the horizontal support unit to the two opposite sides of the retaining wall.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The present invention adds auxiliary pits around the construction pit, and uses the auxiliary pits to isolate the vibration source or the water seepage area, thereby facilitating the later safe construction of the construction pit and reducing the risk of the construction pit collapsing.

[0021] The oblique support unit in the auxiliary pit cavity of the present invention can be connected to the supporting wall in the construction pit through the anchor rod assembly, completing the lateral reinforcement of the side wall of the construction pit, and is fixed through the oblique support and fixed as a whole with the rotary jet pile at the bottom of the auxiliary pit, thereby improving the tensile strength of the anchor rod assembly.

[0022] The detachably connected transverse support unit between the two supporting walls of the present invention can provide horizontal support for the two opposing supporting walls, thereby enhancing the lateral force resistance of the supporting walls at any position from the top to the bottom. The adjustable support position also facilitates later construction operations in the construction pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0024] Figure 1 This is a side structural schematic diagram of the present invention;

[0025] Figure 2 This is a side view of the structure of the present invention without the horizontal branch unit;

[0026] Figure 3 It is a side view structural diagram of the oblique support unit;

[0027] Figure 4 It is a schematic diagram of the side structure of the anchor rod assembly;

[0028] Figure 5 It is a side view structural diagram of the horizontal branch unit;

[0029] Figure 6 This is a schematic diagram of the side view of the inclined beam structure;

[0030] Figure 7 It is a schematic diagram of the side structure of the push plate and the push rod;

[0031] Among them, 1. Construction pit; 2. Support wall; 3. Auxiliary pit; 4. Crown beam; 5. Connecting beam; 6. Jet jet pile; 7. Oblique support; 8. Diagonal tie rod; 9. Connecting column; 10. Fitting piece; 11. Limiting piece; 12. Rubber pad; 13. Extension column; 14. Guide groove; 15. Sliding end; 16. Oblique beam; 17. Socket; 18. Adjustment block; 19. Pin; 20. Push rod; 21. Pull rope; 22. Push plate; 23. Foundation plate; 24. Rotating shaft; 25. Spring. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, in order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Depend on Figure 1-2 The safety protection structure for supporting a civil engineering foundation pit shown includes a main foundation pit support mechanism and a secondary foundation pit mechanism. A pre-tightened anchor assembly is fixedly connected between the secondary and main foundation pit support mechanisms, and the secondary foundation pit mechanism is disposed around the main foundation pit support mechanism. The main foundation pit support mechanism includes a construction pit 1, with support walls 2 disposed on its side walls. The secondary foundation pit mechanism includes an auxiliary pit 3, with oblique support units disposed on the bottom surface of the inner cavity of the auxiliary pit 3. The oblique support units are fixedly connected to the support walls 2 via anchor assemblies. A plurality of transverse support units are detachably connected between the two opposing support walls 2. Crown beams 4 are laid on the top surfaces of the construction pit 1 and the auxiliary pit 3, respectively, and the two crown beams 4 are fixedly connected by a plurality of connecting beams 5.

[0035] The present invention adds auxiliary pits 3 around the sides of the construction pit 1, and uses the auxiliary pits 3 to isolate the vibration source or the water seepage area, thereby facilitating the safe construction of the construction pit 1 in the later stage and reducing the risk of collapse of the construction pit 1. The oblique support unit in the auxiliary pit cavity can be connected to the support wall 2 in the construction pit 1 through the anchor rod assembly, completing the lateral reinforcement of the side wall of the construction pit 1, and is fixed by the oblique support 7 and fixed as a whole with the rotary jet pile 6 at the bottom of the auxiliary pit 3, thereby improving the tensile strength of the anchor rod assembly. The detachable horizontal support unit between the two support walls 2 can complete the lateral support of the two relative support walls 2, and can improve the reinforcement of the support wall 2 against lateral force at any position from the top to the bottom. The support position can be adjusted, which also facilitates the later construction operation in the construction pit 1.

[0036] Depend on Figure 3-4 As shown, the oblique support unit includes a number of rotary jet piles 6, which are embedded in the bottom of the auxiliary pit 3. The rotary jet piles 6 are arranged in several rows, and the rotary jet piles 6 in adjacent rows are staggered. The top of the rotary jet pile 6 is fixedly connected to an oblique support 7, and the oblique support 7 is fixedly connected to the supporting wall 2 through an anchor rod assembly. There are multiple groups of rotary jet piles 6, and the top of the rotary jet pile 6 and the oblique support 7 are cast as one piece, which enhances the overall strength of the oblique support unit and also enhances the seismic resistance and isolation of the auxiliary foundation pit mechanism.

[0037] A further optimized solution is that the anchor rod assembly includes a diagonal tie rod 8, one end of which passes through the support wall 2 and is fixedly connected to the support wall 2. Furthermore, the support wall 2 is formed by casting a steel frame and concrete, and one end of the diagonal tie rod 8 passes through the concrete and is fixedly connected to the steel frame of the support wall 2. A guide groove 14 is cast on the side of the support wall 2 away from the auxiliary pit 3 to facilitate guiding and fixing the horizontal support unit. The other end of the diagonal tie rod 8 passes through and is slidably connected to a connecting column 9. One end face of the connecting column 9 is provided with a tapered hole. The tapered hole is provided with an arc-shaped fitting piece 10 that adapts to the inner wall of the tapered hole. The fitting piece 10 is made of spring steel and can undergo elastic deformation under the pressure of the rubber pad 12. One end of the bonding sheet 10 is fixedly connected to the other end face of the diagonal brace 8. The other end of the bonding sheet 10 is fixedly connected to a limit plate 11. The limit plate 11 is locked with the end face of the connecting column 9. A rubber pad 12 is sandwiched between the two bonding sheets 10. The rubber pad 12 is a water-swelling rubber. It can expand and compress the bonding sheet 10 by absorbing moisture from the backfill soil in the auxiliary pit 3, thereby improving the clamping force of the limit plate 11 and facilitating the overall construction and assembly of the anchor assembly. The rubber pad 12 is embedded with a sensor group that can detect soil moisture and the pressure on the rubber pad 12. By detecting soil moisture, the sensor group can determine the degree of water penetration in the auxiliary pit 3 and thus the safety of the construction pit 1, facilitating the preparation of countermeasures in advance. The sensor group uses a pressure sensor to detect the pressure exerted by the rubber pad 12 on the bonding sheet 10 and whether the limit plate 11 is working. Finally, an alarm electrically connected to the sensor group alerts construction management personnel, reducing the occurrence of safety accidents. An extension column 13 is screwed onto the end surface of the connecting column 9 , and the extension column 13 is fixedly connected to the top surface of the oblique support 7 .

[0038] Depend on Figure 2 As shown, a plurality of guide grooves 14 are provided on one side of the supporting wall 2, and the guide grooves 14 are detachably connected to the horizontal support units; the guide grooves 14 pass through the top and bottom surfaces of the supporting wall 2, and the plurality of guide grooves 14 are either interconnected or arranged at equal intervals to facilitate the arrangement of the horizontal support units.

[0039] Depend on Figure 5-7As shown, the horizontal support unit includes a sliding end 15, the sliding end 15 is detachably connected to the guide groove 14, one end face of the sliding end 15 is rotatably connected to the inclined beam 16, one end face of the inclined beam 16 is provided with a plurality of jacks 17, an adjustment block 18 is slidably connected between the two inclined beams 16, the two side faces of the adjustment block 18 are respectively adapted to the end faces of the inclined beam 16, the two side faces and the top face of the adjustment block 18 are respectively provided with a sliding hole and a slot, and the sliding hole and the slot are connected; a latch 19 is slidably connected in the sliding hole, and the latch 19 is One end is detachably connected to the socket 17, and the other end of the latch 19 is rotatably connected to a push rod 20. One end of the two push rods 20 is hinged to each other, and a pull rope 21 is fixedly connected to the hinge axis of the two push rods 20. The top of the pull rope 21 is fixedly connected to a push plate 22. The push plate 22 is slidably connected to the slot. The push plate 22 can push the two push rods 20 to push the latch 19 and insert it into the socket 17. At the same time, the pull rope 21 can be pulled to pull the two push rods 20, causing the two latches 19 to slide out of the socket 17. Furthermore, the push plate 22 is a metal plate that can apply a certain amount of pre-pressure to the latch 19, facilitating the installation of the horizontal support unit.

[0040] Furthermore, in order to facilitate the lifting and installation of the transverse support unit and to prevent the transverse support unit from collapsing, a rotating shaft 24 is rotatably connected to the side of the adjustment block 18 and the side of the inclined beam 16, and a spring 25 is rotatably connected between the two rotating shafts 24.

[0041] A further optimization scheme is to provide multiple auxiliary pits 3, each of which is arranged around the construction pit 1 and close to the direction of the external vibration source. The auxiliary pits 3 can be in one or more of the following shapes: arc, circle, square, and ring, to facilitate the protection of the construction pit 1. The auxiliary pits 3 can be independently arranged around the construction pit 1, or interconnected to surround the construction pit 1.

[0042] To further optimize the plan, several rows of jet grouting piles 6 are buried in the bottom of the inner cavity of the construction pit 1, and each row of jet grouting piles 6 is arranged perpendicular to each row of jet grouting piles 6 in the auxiliary pit 3; the top of the jet grouting piles 6 in the construction pit 1 is fixedly connected to the foundation plate 23, and the surrounding side of the foundation plate 23 is fixedly connected to the supporting wall 2. The foundation plate 23, the supporting wall 2 and the jet grouting piles 6 are cast as one piece, which improves the strength of the base in the construction pit 1.

[0043] A safety protection method for civil engineering foundation pit support, comprising the following steps:

[0044] S1. Laying out auxiliary pit 3: Digging auxiliary pit 3, laying cap beam 4 on top of auxiliary pit 3 and construction pit 1, setting auxiliary pit 3 between the preset position of construction pit 1 and the external vibration source, and burying vibration detection device in auxiliary pit 3;

[0045] First, the location of construction pit 1 must be determined according to the construction drawings. The location of auxiliary pit 3, based on the surrounding environment, must also be determined. Excavation equipment should be used to excavate auxiliary pit 3, ensuring that the edge of auxiliary pit 3 is at least 1.5 meters away from the edge of construction pit 1. At the same time, crown beams 4 should be laid at the tops of auxiliary pit 3 and construction pit 1 to facilitate the passage of construction vehicles and the installation and support of construction equipment.

[0046] S2, construction of auxiliary pit 3: bury jet grouting piles 6 at the bottom of the auxiliary pit 3, and cast oblique supports 7, preset anchor rod assemblies on the top surface of the oblique supports 7, and the other end of the anchor rod assembly is set through the side wall of the auxiliary pit 3;

[0047] After the auxiliary pit 3 is excavated, jet grouting piles 6 are buried at the bottom of the auxiliary pit 3. The spacing between each row of jet grouting piles 6 is 600mm-900mm. The spacing between adjacent jet grouting piles 6 in each row of jet grouting piles 6 is -300mm-400mm, which is convenient for flexible combination and use according to the construction geology. The steel skeleton of the jet grouting piles 6 is fixedly connected to the steel skeleton of the oblique support 7, and concrete is poured at the same time to achieve the integrated molding of the jet grouting piles 6 and the oblique support 7. During the process, the extension column 13 is cast together with the oblique support 7 to improve the tensile strength of the anchor rod assembly. The other end of the anchor rod assembly is penetrated through the side wall of the auxiliary pit 3, and after waiting for the oblique support 7 and the jet grouting piles 6 to solidify, backfill and compact. After backfilling is completed, a vibration detection device is buried in the backfill soil. The intelligent vibration detection device is used to detect the vibration frequency of the vibration source. Combined with the sensor group in the rubber pad 12, the geological environment around the construction pit 1 can be comprehensively detected to avoid the occurrence of safety accidents. It can also be connected with an external alarm device to warn of dangers in the construction process.

[0048] S3. Laying out the construction pit 1: Using the auxiliary pit 3 and the crown beam 4 laid on the top of the construction pit 1 and the connecting beam 5 between the two crown beams 4 to harden the construction site, the construction pit 1 is excavated.

[0049] After the auxiliary pit 3 is backfilled, the construction pit 1 is excavated. During this process, the crown beam 4 and the connecting beam 5 bear the pressure of the construction vehicles and equipment during the excavation process, thereby preventing the construction pit 1 from collapsing during the excavation process.

[0050] S4, construction of the construction pit 1: burying the jet grouting pile 6 at the bottom of the construction pit 1, setting the support wall 2 on the side wall of the construction pit 1 and fixing it to the anchor assembly, then casting the foundation plate 23 at the bottom of the construction pit 1, and connecting the support wall 2 and the jet grouting pile 6 as a whole;

[0051] During the excavation of the construction pit 1, jet grouting piles 6 are buried at the bottom of the construction pit 1. As the construction pit 1 is completed, the steel skeleton for the retaining wall 2 is laid on the side walls of the construction pit 1. The steel skeleton for the foundation plate 23 is laid on the bottom surface of the construction pit 1. All the steel skeletons are fixedly connected to the jet grouting piles 6, and then cast as an integrated whole. Guide chutes 14 are provided on the sides of the retaining wall 2 during the casting process.

[0052] S5. Horizontal support: connect the horizontal support unit to the two opposite sides of the supporting wall 2.

[0053] The sliding end 15 is set in the guide groove 14, and an anti-slip rubber layer is fixed to one end surface of the sliding end 15 to increase the friction between the sliding end 15 and the guide groove 14. By adjusting the position of the adjustment block 18, the relative distance between the two sliding ends 15 can be adjusted, and then the two opposing support walls 2 can be fixed through the cross-bracing unit. After the two sliding ends 15 support the support wall 2, the push plate 22 is pressed, and the push plate 22 presses the push rod 20, and the push rod 20 pushes the pin 19 into the socket 17, realizing the overall limiting fixation of the inclined beam 16 and the adjustment block 18. At the same time, the push plate 22 always presses on the push rod 20, realizing the stable connection of the pin 19 to the inclined beam 16 and the adjustment block 18.

[0054] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A safety protection structure for supporting foundation pits in civil engineering, characterized in that: The invention comprises a main foundation pit support mechanism and an auxiliary foundation pit mechanism, wherein an anchor rod assembly capable of pre-tightening is fixedly connected between the auxiliary foundation pit mechanism and the main foundation pit support mechanism, and the auxiliary foundation pit mechanism is arranged on the peripheral side of the main foundation pit support mechanism; the main foundation pit support mechanism comprises a construction pit (1), and a support wall (2) is arranged on the side wall of the construction pit (1); the auxiliary foundation pit mechanism comprises an auxiliary pit (3), and an oblique support unit is arranged on the bottom surface of the inner cavity of the auxiliary pit (3); the oblique support unit is fixedly connected to the support wall (2) through the anchor rod assembly; a transverse support unit is detachably connected between two opposing support walls (2); a crown beam (4) is laid on the top surface of the construction pit (1) and the top surface of the auxiliary pit (3), and the two crown beams (4) are fixedly connected by a plurality of connecting beams (5); The oblique support unit comprises a plurality of jet grouting piles (6), the plurality of jet grouting piles (6) being embedded in the bottom of the auxiliary pit (3), the jet grouting piles (6) being arranged in a plurality of rows, and the jet grouting piles (6) in adjacent rows being arranged in a staggered manner; an oblique support (7) is fixedly connected to the top of the jet grouting pile (6), and the oblique support (7) is fixedly connected to the retaining wall (2) through the anchor rod assembly; The anchor rod assembly includes an inclined rod (8), one end of the inclined rod (8) passes through the supporting wall (2) and is fixedly connected to the supporting wall (2), the other end of the inclined rod (8) passes through and is slidably connected to a connecting column (9), one end face of the connecting column (9) is provided with a conical hole, and an arc-shaped fitting piece (10) adapted to the inner wall of the conical hole is provided in the conical hole, one end of the fitting piece (10) is fixedly connected to the other end face of the inclined rod (8), and the The other end of the fitting sheet (10) is fixedly connected to a limiting sheet (11), and the limiting sheet (11) is detachably connected to the end face of the connecting column (9). A rubber pad (12) is sandwiched between the two fitting sheets (10), and a sensor group capable of detecting soil moisture and the pressure exerted on the rubber pad (12) is embedded in the rubber pad (12); an extension column (13) is screwed to the end face of the connecting column (9), and the extension column (13) is fixedly connected to the top surface of the oblique support (7).

2. A safety protection structure for supporting a foundation pit in civil engineering according to claim 1, characterized in that: A plurality of guide slots (14) are provided on one side of the support wall (2), and the guide slots (14) are detachably connected to the transverse support unit; the guide slots (14) pass through the top and bottom surfaces of the support wall (2).

3. A safety protection structure for supporting a foundation pit in civil engineering according to claim 2, characterized in that: The transverse support unit includes a sliding end (15), the sliding end (15) is detachably connected to the guide groove (14), one end surface of the sliding end (15) is rotatably connected to an inclined beam (16), one end surface of the inclined beam (16) is provided with a plurality of jacks (17), an adjustment block (18) is slidably connected between the two inclined beams (16), the two side surfaces of the adjustment block (18) are respectively adapted to the end surfaces of the inclined beam (16), and the two side surfaces and the top surface of the adjustment block (18) are respectively opened. A sliding hole and a slot are provided, and the sliding hole and the slot are communicated with each other; a latch (19) is slidably connected in the sliding hole, one end of the latch (19) is detachably connected to the slot (17), and the other end of the latch (19) is rotatably connected to a push rod (20), one end of the two push rods (20) are hinged to each other, and the hinge shafts of the two push rods (20) are fixedly connected to a pull rope (21), and a push plate (22) is fixed to the top of the pull rope (21), and the push plate (22) is slidably connected to the slot.

4. A safety protection structure for supporting a foundation pit in civil engineering according to claim 1, characterized in that: A plurality of auxiliary pits (3) are provided, and the plurality of auxiliary pits (3) are respectively provided on the peripheral sides of the construction pit (1) and close to the direction of the external vibration source.

5. A safety protection structure for supporting a foundation pit in civil engineering according to claim 4, characterized in that: The plurality of auxiliary pits (3) are either independently arranged on the periphery of the construction pit (1), or are interconnected and arranged to surround the construction pit (1).

6. A safety protection structure for supporting a foundation pit in civil engineering according to claim 5, characterized in that: A plurality of rows of jet grouting piles (6) are buried in the bottom surface of the inner cavity of the construction pit (1), and each row of the jet grouting piles (6) is arranged perpendicularly to each row of the jet grouting piles (6) in the auxiliary pit (3); the top ends of the jet grouting piles (6) in the construction pit (1) are fixedly connected to a foundation plate (23), and the peripheral side of the foundation plate (23) is fixedly connected to the supporting wall (2).

7. A safety protection method for supporting a foundation pit in a civil engineering project, based on a safety protection structure for supporting a foundation pit in a civil engineering project according to any one of claims 1 to 6, characterized in that: The steps include: S1. Laying out the auxiliary pit (3): digging the auxiliary pit (3), laying a crown beam (4) on the top of the auxiliary pit (3) and the construction pit (1), setting the auxiliary pit (3) between the preset position of the construction pit (1) and the external vibration source, and burying a vibration detection device in the auxiliary pit (3); S2, construction of the auxiliary pit (3): burying the jet grouting pile (6) at the bottom of the auxiliary pit (3), and casting the inclined support (7), presetting the anchor rod assembly on the top surface of the inclined support (7), and setting the other end of the anchor rod assembly through the side wall of the auxiliary pit (3); S3, laying out the construction pit (1): using the crown beam (4) laid on the top of the auxiliary pit (3) and the construction pit (1) and the connecting beam (5) between the two crown beams (4) to achieve hardening of the construction site, and digging the construction pit (1); S4, construction of the construction pit (1): burying jet grouting piles (6) at the bottom of the construction pit (1), setting a support wall (2) on the side wall of the construction pit (1) and fixing it to the anchor rod assembly, then casting a foundation plate (23) at the bottom of the construction pit (1), and connecting the support wall (2) and the jet grouting piles (6) into a whole; S5. Horizontal support: connect the horizontal support unit to the sides of two opposite supporting walls (2).

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