Frame sinking open excavation heading machine and foundation pit excavation supporting method

Abstract

The invention provides a sinking frame open excavation heading machine and a foundation pit excavation supporting method, the sinking frame open excavation heading machine comprises a main body truss and at least one assembly system arranged on the main body truss, and the assembly system comprises a suspender device arranged on the main body truss and a telescopic mechanism arranged at the bottom of the suspender device; the assembling device is connected with the telescopic mechanism and can move up and down under the driving of the telescopic mechanism, and the assembling device is used for supporting the guard plate or the assembled structure to a designated position; the excavating device is fixedly connected to the bottom of the assembling device and used for excavating and / or trimming the foundation pit below the assembling device. According to the sinking frame open excavation heading machine and the foundation pit excavation supporting method, a foundation pit supporting system can be effectively reduced, and stratum pollution is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of excavation machinery and equipment, and in particular to a sunken frame excavation machine and a foundation pit excavation support method. Background Art

[0002] In recent years, the scale of subway, integrated pipe gallery, municipal tunnel and other projects has continued to expand. Among them, open cut method is a common tunnel excavation method. However, the conventional open cut method has high risks in the excavation and support process, and there are risks such as earth collapse and steel support instability. During the excavation of the foundation pit, if reinforced concrete structures such as retaining piles and anchor cables are used for support, it may have a great impact on the implementation of nearby projects in the long term, and even cost more to deal with. If slope excavation is used, a large amount of slag will be transported out, which will have a great impact on the environment of the construction area.

[0003] In response to the above problems, the patent with publication number CN116892212A proposes a trench construction vehicle and its construction method. The vehicle includes a gantry mechanism, on which various transverse and longitudinal moving sleeves are arranged, and a tamping mechanism connected to the bottom of the transverse moving sleeve is used to tamp the inside of the trench, and the transverse plates are connected to support the foundation pit. However, it is only applicable to the treatment and support of existing foundation pits, and does not involve the excavation and support scenes of foundation pits. The patent with publication number CN116220063A proposes a trench excavation and support method, which excavates trenches on site, matches sliding support components, uses "X"-shaped support rods to support the foundation pit, and uses sliding wheels to move on the side walls of the foundation pit, but its guard plate is only supported at both ends, and the "X"-shaped support rods are poorly stressed, making it difficult to adapt to the excavation and support process of deep-buried foundation pits. The patent with publication number CN 116575470A proposes a foundation pit excavation support method based on the excavation compensation method and a complete set of equipment thereof, which divides the foundation pit into longitudinal sections and vertical layers, and then constructs retaining piles; and places lining components along the excavated inner contour of the foundation pit, and fixes the excavation support equipment inside it, uses a cutting device to excavate the bottom of the foundation pit, and uses supporting pipe segments for support. However, this method has poor adaptability when constructing narrow and long foundation pits, is only suitable for the excavation of a single rectangular foundation pit, and requires the removal of the previous support modules, has poor flexibility, and wastes a lot of materials. Patents CN111456032A and CN117758747A respectively proposed using a support frame and its guard plate structure to support the side wall of the excavated soil. By connecting different support devices, the stability and flexibility of the support are improved, and the waterproof effect is effectively improved. However, the support devices in the above two patents can only perform passive sinking and support methods, and mainly rely on auxiliary excavation devices for excavation. Moreover, the foundation pit support device does not have active excavation components, nor does it have main support structures such as supporting trusses. During construction, it needs to cooperate with other excavation equipment and assembly equipment, and needs to occupy other construction space, which leads to very poor mechanization and integration levels during the open excavation construction of the sunken frame.

[0004] In view of this, the inventor, based on many years of production design experience in this field and related fields, has designed a sunken frame open excavation machine and foundation pit excavation support method after repeated experiments, in order to solve the problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a sunken frame open excavation machine and a foundation pit excavation support method, which can effectively reduce the foundation pit support system and reduce stratum pollution.

[0006] To achieve the above object, the present invention provides a sunken frame excavator, wherein the sunken frame excavator comprises a main truss and at least one assembly system arranged on the main truss, and the assembly system comprises:

[0007] A suspension rod device is arranged on the main truss, and a telescopic mechanism is arranged at the bottom of the suspension rod device;

[0008] An assembly device, connected to the telescopic mechanism and capable of moving up and down under the drive of the telescopic mechanism, the assembly device being used to support the guard plate or assembled structure to a specified position;

[0009] An excavation device is fixedly connected to the bottom of the assembly device, and is used to excavate and / or trim the foundation pit below the assembly device.

[0010] The present invention further provides a foundation pit excavation and support method, wherein the foundation pit excavation and support method comprises:

[0011] S1. Divide the foundation pit to be excavated into a plurality of excavation units along the length direction, and divide each of the excavation units into two excavation stages, and perform excavation of the soil of the first excavation unit in the first excavation stage;

[0012] S2. After the first excavation stage of the first excavation unit is completed, the first excavation stage of the second excavation unit is excavated, and at the same time, the excavation device of the sunken frame excavator is used to excavate the first excavation unit in the second excavation stage. After the second excavation stage is completed, the assembly system is used to support the first excavation unit after the excavation is completed;

[0013] S3. After the first excavation stage of the second excavation unit is completed, the first excavation stage of the third excavation unit is excavated, and the assembly system is moved and the assembly system is used to perform excavation and support for the second excavation stage of the second excavation unit after the excavation is completed;

[0014] S4. After the assembly system completes the support of the first excavation unit, the main structure is constructed inside the first excavation unit, and synchronous backfilling operations are carried out after the main structure construction is completed;

[0015] S5. And so on, repeat the process of S1 to S4 to complete the construction work of the entire foundation pit.

[0016] Compared with the prior art, the present invention has the following characteristics and advantages:

[0017] The sunken frame open excavator and foundation pit excavation support method proposed in the present invention uses an excavation device to perform excavation and / or trimming of the foundation pit in the second excavation stage, and then assembles and supports the guard plate and prefabricated structure through an assembly device. The excavation and support of the foundation pit can be achieved using only the assembly system, without the need to introduce support construction equipment again, which not only saves costs but also effectively shortens the construction period. The excavation device of the assembly system is arranged below the assembly device. As the excavation device excavates the foundation pit, the height of the excavation device and the assembly device gradually moves downward, so that the excavation operation and the installation operation of the guard plate and the prefabricated structure are all carried out inside the foundation pit, and the underground space around the foundation pit is no longer occupied, reducing the impact on the existing buildings around the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0019] Figure 1 This is the overall schematic diagram of the sunken frame excavation machine;

[0020] Figure 2 This is a schematic diagram of the excavation and lifting system;

[0021] Figure 3 This is a schematic diagram of the components of the excavation and lifting system;

[0022] Figure 4 It is a working diagram of the excavation and lifting system;

[0023] Figure 5 It is the overall schematic diagram of the assembly system;

[0024] Figure 6 It is a working schematic diagram of the assembly system;

[0025] Figure 7 A schematic diagram of an assembly device with an assembled structure;

[0026] Figure 8 It is a schematic diagram of the power system, counterweight and auxiliary bracket;

[0027] Fig. 9 is a schematic diagram of the travel system;

[0028] Fig.10 It is a schematic diagram of the assembly of the prefabricated structure and the guard plate;

[0029] Fig.11 This is the construction flow chart of the present invention (I);

[0030] Fig.12 This is the construction flow chart (II) of the present invention;

[0031] Fig.13 This is the construction flow chart (III) of the present invention;

[0032] Fig.14 This is the construction flow chart (IV) of the present invention;

[0033] Fig.15 This is a construction flow chart (I) of Embodiment 1 of the present invention;

[0034] Fig.16 This is a construction flow chart (II) of the first embodiment of the present invention;

[0035] Fig.17 This is a construction flow chart (III) of the first embodiment of the present invention;

[0036] Fig.18 This is a construction flow chart (IV) of the first embodiment of the present invention;

[0037] Fig.19 This is a construction flow chart (V) of the first embodiment of the present invention;

[0038] Fig. 20 This is a construction flow chart (VI) of the first embodiment of the present invention;

[0039] Fig.21 This is a construction flow chart (VII) of the first embodiment of the present invention;

[0040] Fig. 22 This is a construction flow chart (I) of the second embodiment of the present invention;

[0041] Fig.23 This is a construction flow chart (II) of the second embodiment of the present invention;

[0042] Fig.24 This is the construction flow chart (III) of the second embodiment of the present invention;

[0043] Fig.25 This is a construction flow chart (IV) of the second embodiment of the present invention;

[0044] Fig.26 This is the construction flow chart (V) of the second embodiment of the present invention;

[0045] Fig. 27 This is the construction flow chart (VI) of the second embodiment of the present invention;

[0046] Fig.28 This is the construction flow chart (VII) of the second embodiment of the present invention.

[0047] Description of Reference Numerals

[0048] 100. Excavation machine for sunken frame; 1. Main truss;

[0049] 11. First transverse truss; 12. Vertical truss;

[0050] 13. Second transverse truss; 14. Auxiliary bracket;

[0051] 2. Excavation and lifting system; 21. Lifting truss;

[0052] 22. Walking beam; 23. Pulley assembly;

[0053] 24. Steel rope; 25. Grab bucket;

[0054] 3. Assembly system; 31. Suspension device;

[0055] 311. telescopic mechanism; 312. suspension rod;

[0056] 32. Assembly device; 321. Assembly plate;

[0057] 322, connecting rod; 323, mounting rod;

[0058] 33. Excavation device; 331. Working arm;

[0059] 332. Milling head; 34. Auxiliary kit;

[0060] 4. Power system; 5. Travel system;

[0061] 51. Equipment track; 52. Travel wheel device;

[0062] 53. Track foundation; 6. Prefabricated structure;

[0063] 61. Prefabricated pipe joint; 611. Prefabricated cover plate;

[0064] 612. Prefabricated side wall pipe section; 613. Bolted joint;

[0065] 613. Connecting groove; 62. Connecting device;

[0066] 7. Support device; 71. Standard guard plate;

[0067] 72. Connecting guard plate; 721. Bolt joint;

[0068] 722. Guard plate water stop groove; 723. Water-expanding rubber pad;

[0069] 724. Connecting and fixing device; 8. Counterweight device;

[0070] 9. Soil; 10. Steel support;

[0071] 11. Lining structure; 111. Bottom concrete;

[0072] 112. Lining concrete. DETAILED DESCRIPTION

[0073] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0074] like Figure 1 As shown, the present invention proposes a sunken frame open excavator 100, which includes a main frame truss 1 and at least one assembly system 3 arranged on the main frame 1, the assembly system 3 includes a suspension device 31, an assembly device 32 and an excavation device 33 connected in sequence from top to bottom, wherein the suspension device 31 is arranged on the main frame 1, and a telescopic mechanism 311 is arranged at the bottom of the suspension device 31; the assembly device 32 is connected to the telescopic mechanism 311 and can move up and down under the drive of the telescopic mechanism 311, and the assembly device 32 is used to support the guard plate 7 or the assembled structure 6 to the specified position; the excavation device 33 is fixedly connected to the bottom of the assembly device 32, and the excavation device 33 is used to excavate and / or trim the foundation pit below the assembly device 32.

[0075] The sunken frame excavator 100 proposed in the present invention uses an excavation device 33 to excavate and / or trim the foundation pit 200, and then assembles and supports the guard plate 7 and the prefabricated structure 6 through the assembly device 32. The excavation and support of the foundation pit can be achieved by using only the assembly system 3, and there is no need to introduce support construction equipment again, which not only saves costs but also effectively shortens the construction period. The sunken frame excavator 100 proposed in the present invention has an excavation device 33 arranged below the assembly device 32. As the excavation device 33 excavates the foundation pit 200, the heights of the excavation device 33 and the assembly device 32 gradually move downward, so that the excavation operation and the installation operation of the prefabricated structure 6 and the guard plate 7 are all carried out inside the foundation pit 200, and no longer occupy the underground space around the foundation pit 200, thereby reducing the impact on the existing buildings and structures around the foundation pit 200. At the same time, the assembly structure 6 exerts a supporting force on the soil on both sides of the foundation pit 200 through the guard plate 7, thereby supporting the soil on both sides of the foundation pit 200 from collapsing inward, and finally achieving a supporting effect.

[0076] In an optional embodiment of the present invention, the assembly device 32 includes a mounting seat and two mounting mechanisms, the mounting seat is connected to the bottom end of the telescopic mechanism 311 and is driven by the telescopic mechanism 311 to move up and down; the two mounting mechanisms are symmetrically arranged on opposite sides of the mounting seat, each mounting mechanism is detachably connected to a guard plate 7 (or assembled structure 6), and the two mounting mechanisms can push the guard plate 7 (or assembled structure 6) to move horizontally to the two side edges of the foundation pit 200, so as to facilitate the subsequent assembly and support construction operations of the guard plates 7 (assembled structures 6) on both sides of the foundation pit 200.

[0077] In an optional example of this embodiment, each mounting mechanism includes a driving component (not shown in the figure) and two or more mounting rods 323, each mounting rod 323 is a telescopic rod, one end of the mounting rod 323 is connected to the mounting seat, and the other end of the mounting rod 323 can be extended and retracted in the horizontal direction, and the driving component is connected to each mounting rod 323 and drives each mounting rod 323 to be synchronously extended. With the above structure, through the telescopic structure of the mounting rod 323 itself, the guard plate 7 (or assembled structure 6) can be supported or disassembled to the specified position through the top extension of the mounting rod 323 after the guard plate 7 (or assembled structure 6) is hoisted to the specified position.

[0078] In an optional example, the mounting rod 323 can be set to be perpendicular to the side wall of the foundation pit 200, or can be set to be inclined to the side wall of the foundation pit 200. The guard plate 7 (or the assembled structure 6) can be transported to the designated position through the mounting rod 323.

[0079] In an optional example, the driving component is a hydraulic cylinder or a pneumatic cylinder.

[0080] In an optional example, two mounting mechanisms located on both sides of the mounting seat move synchronously to push the corresponding guard plates 7 (or prefabricated structures 6) to move toward both sides of the foundation pit 200. During the above-mentioned supporting process, the mounting mechanisms provide reaction forces to each other, thereby synchronously supporting the two guard plates 7 (or prefabricated structures 6) and keeping the soil 9 on both sides of the foundation pit 200 balanced.

[0081] In an optional example of this embodiment, the mounting base includes a connecting rod 322 and two assembly plates 321 , the connecting rod 322 is horizontally arranged, the assembly plates 321 are respectively fixed to both ends of the connecting rod 322 , and the mounting rod 323 is connected to the assembly plates 321 .

[0082] In an optional example, the connecting rod 322 is also a telescopic rod, and the distance between the two assembly plates 321 can be adjusted. By adjusting the distance between the two assembly plates 321, the lateral stroke of the installation rod 323 can be supplemented. The telescopic connection rod 322 can be used to install a guard plate with a larger foundation pit width.

[0083] In another optional example, the connecting rod 322 is a fixed structure, which obtains a more stable supporting force at the cost of losing some flexibility.

[0084] In an optional example of the present invention, a guard plate 7 (or a prefabricated structure 6) is supported / disassembled synchronously by two assembly devices 32 to increase the stability and safety of the guard plate 7 (or prefabricated structure 6) during installation.

[0085] In an optional embodiment of the present invention, the excavation device 33 includes at least one excavation mechanism, which includes a working arm 331 and a milling head 332. One end of the working arm 331 is rotatably connected to the assembly device 32, and the other end of the working arm 331 is connected to the milling head 332. With the above structure, the working arm 331 can rotate left and right to achieve multi-angle rotation variable cross-section excavation, ensuring that sufficient excavation gaps are left during the installation of the guard plate 7 (or the assembled structure 6).

[0086] In an optional example of this embodiment, the excavation device 33 includes two or more excavation mechanisms, and the number of the excavation mechanisms is determined according to the width of the foundation pit 200 .

[0087] In the present invention, the excavation device 33 is used to excavate the soil below the guard plate 7 (or the prefabricated structure 6). The excavation device 33 can be used as the main excavation equipment to directly excavate the lower soil, or as an auxiliary excavation equipment to clean the soil at the installation location of the guard plate 7 (or the prefabricated structure 6) and trim the side walls of the foundation pit 200.

[0088] In an optional embodiment of the present invention, the main truss 1 includes a plurality of force-bearing frames arranged in sequence and at intervals along the length direction of the foundation pit 200, and the force-bearing frames include a first transverse truss 11 and two vertical trusses 12. The first transverse truss 11 is arranged horizontally and spans the foundation pit 200 (that is, the first transverse truss is arranged along the width direction of the foundation pit 200), and the two vertical trusses 12 are supported at both ends of the first transverse truss 11. Two adjacent force-bearing frames are connected by a plurality of horizontally arranged second transverse trusses 13. The first transverse truss 11 and the vertical truss 12 are combined to form the main force-bearing frame of the sunken frame excavator 100 to support the operation of the assembly system 3.

[0089] In an optional example, the first transverse truss 11 and the vertical truss 12 are made of steel components and are connected by welding or bolts.

[0090] In an optional example, the main truss 1 also includes an auxiliary bracket 14, which is arranged on the side of the vertical truss 12 and is connected to the vertical truss 12 by welding or bolting. The power system 4, the counterweight device 8 and other construction items required for foundation pit excavation and support can be installed on the auxiliary bracket 14.

[0091] The power system 4 mainly provides a power source for the sunken frame excavator 100, and the power system 4 can be in the form of electricity, hydraulic pressure, air pressure, etc.

[0092] Preferably, the power system 4 is arranged on the auxiliary bracket 14 on the side wall of the main truss 1, and can also serve as a counterweight of the sunken frame excavator 100 to increase its overall stability.

[0093] Furthermore, in addition to the power system 4 as the basic counterweight, additional counterweights and other equipment may be installed on the auxiliary bracket 14 to balance the overall force of the main truss 1 to enhance the overall stability of the sunken excavator 100.

[0094] In an optional example of this embodiment, the suspension rod device 31 includes a plurality of suspension rods 312 arranged vertically and spaced apart, the top of each suspension rod 312 is connected to the first transverse truss 11, and the bottom end of each suspension rod 312 can be synchronously extended and retracted up and down to form a telescopic mechanism 311.

[0095] In an optional example, the top of each suspension rod 312 can reciprocate along the length direction of the first transverse truss 11. By moving the suspension rod 312, the position of the assembly device 32 and the excavation device 33 installed at the bottom of the suspension rod 312 can be adjusted; the assembly device 32 can be extended and retracted synchronously to achieve support for a larger width of the foundation pit 200, thereby increasing the flexibility of the sunken frame excavation machine 100.

[0096] In another optional example, each suspension rod 312 is fixedly connected to the first transverse truss 11, the distance between two adjacent suspension rods 312 is a fixed value, and the moving distance of the connecting rod 322 is also a fixed value.

[0097] In an optional embodiment of the present invention, the sunken frame excavator 100 also includes an excavation and hoisting system 2, which includes a hoisting truss 21, a walking beam 22 and at least one grab 25. The hoisting truss 21 is horizontally arranged at the front end of the main truss 1; the walking beam 22 is fixedly connected to the bottom of the hoisting truss 21, and the two ends of the walking beam 22 can extend horizontally to the two sides of the main truss 1; the grab 25 can be slidably connected to the walking beam 22, and the grab 25 is used to excavate the foundation pit below the hoisting truss 21 and to lift the earthwork generated by the excavation of the foundation pit. With the above structure, the excavation and hoisting system 2 can perform the first stage of excavation of the foundation pit 200, which can effectively improve the excavation efficiency of the sunken frame excavator 100.

[0098] In an optional example of this embodiment, the lifting truss 21 is arranged parallel to the first transverse truss 11, and the two ends of the lifting truss 21 are respectively fixedly connected to the two second transverse trusses 13. In addition, the lifting truss 21 is located at the front end of the main truss 1, that is, when the sunken frame excavator 100 is excavating, the excavation and lifting system 2 is used to perform the first excavation of the foundation pit 200, and then the assembly system 3 located behind the excavation and lifting system 2 is used to perform the second excavation of the foundation pit 200 and trim the side wall of the foundation pit 200.

[0099] In an optional example, the walking beam 22 is provided with a pulley assembly 23 that can reciprocate along the length direction of the walking beam 22, and the grab 25 is suspended on the pulley assembly 23 through a steel cable 24, and the steel cable 24 can move up and down with the grab 25. With the above structure, the walking beam 22 is suspended at the lower end of the lifting truss 21, and the walking beam 22 provides a track for the pulley assembly 23 to move. The pulley assembly 23 can move to the outside of the main truss 1 along the length direction of the walking beam 22, and the steel cable 24 and the grab 25 also move to the outside of the main truss 1 with the pulley assembly 23, and the earth in the grab 25 is also lifted out of the foundation pit 200, further improving the excavation efficiency of the foundation pit 200.

[0100] In an optional example, the grab bucket 25 is a lifting device that relies on the opening and closing of two left and right combined buckets or multiple jaws to grab and discharge bulk materials. It mainly serves to excavate and lift the soil inside the foundation pit 200, thereby realizing the excavation of the foundation pit 200.

[0101] Furthermore, the grab 25 may be a hydraulic grab or a mechanical grab, which is driven by hydraulic pressure or a rope or a connecting rod external force to perform excavation and lifting of the soil in the foundation pit 200.

[0102] In the present invention, the grab bucket 25 matched with the sunken frame excavator 100 is not the only excavation device for construction. The grab bucket 25 can also be used as an auxiliary equipment matched with the milling head equipped with the assembly system and conventional excavators, scrapers and other excavation equipment.

[0103] In an optional example, a steel cable 24 connects the pulley assembly 23 and the grab bucket 25. The steel cable 24 can move up and down to drive the grab bucket 25 to move up and down. At the same time, the steel cable 24 can also be matched with the pulley assembly 23 to move along the length direction of the walking beam 22 (move left and right), thereby driving the lower grab bucket 25 to move left and right along the walking beam 22.

[0104] In an optional example, the steel cable 24 can be replaced by a telescopic mechanism, which can not only control the up and down movement of the grab 25, but also provide rigid reaction force support for the excavation of the grab 25 and provide an attachment structure for the power source pipeline of the grab 25.

[0105] In this embodiment, the purpose of moving the excavation and hoisting system 2 inside the main truss 1 is achieved through the pulley assembly 23 and the steel cable 24 .

[0106] In an optional example of this embodiment, the sunken frame excavator 100 also includes a travel system 5, which is the main moving mode of the sunken frame excavator 100. The travel system 5 includes a travel wheel device 52 and equipment tracks 51 arranged on both sides of the foundation pit 200. The travel wheel device 52 is arranged at the bottom of the main truss 1, and the travel wheel device 52 is located on the equipment track 51 and cooperates with the equipment track 51 in rolling. The travel wheel device 52 rolls along the equipment track 51 to drive the movement of the main truss 1, and the purpose of the sunken frame excavator 100 moving along the equipment track 51 can be achieved as the excavation and support progresses.

[0107] In an optional example of this embodiment, the equipment track 51 can be a conventional railway track, with steel rails fixed on sleepers, and ballast under the sleepers, and fastened by railway accessories such as rail supports, fasteners, rail clamps, rail clamps, spring bars, and rail spikes.

[0108] In an optional example, the equipment track 51 can be inserted into the hardened road surface at the bottom. If necessary, a track foundation 53 can be set according to the excavation size of the foundation pit 200, the weight of the main truss 1 of the sunken frame excavator 100, and the geological environment around the foundation pit 200 to support the entire sunken frame excavator 100 and avoid the equipment from tilting or collapsing into the foundation pit.

[0109] In an optional example of this embodiment, the walking wheel device 52 is connected to a power system, which provides a power basis for the walking wheel device 52 to move forward, and can drive the walking wheel device 52 to move forward along the equipment track 51 by electricity, hydraulics, gear drive, etc.

[0110] In another optional example of the present embodiment, the driving device may not be provided, and according to the scale of the submerged excavator 100, common construction equipment such as a forklift, a transport vehicle, etc. may be selected for traction.

[0111] In the present invention, the guard plate 7 can be a precast concrete / steel plate or other component, which mainly plays the role of supporting the side wall soil of the foundation pit 200. The guard plate 7 is connected with assembly equipment, steel support, concrete support and other internal foundation pit support means to jointly support the side wall soil of the foundation pit.

[0112] In the present invention, the assembled structure 6 is mainly composed of prefabricated pipe segments 61 and connecting devices 62. The prefabricated pipe segments 61 are used as a support system for the sunken frame excavator 100, mainly supporting the side wall soil of the foundation pit 200 during construction and serving as the main structure after completion.

[0113] In the present invention, the prefabricated guard plate 7 is divided into a standard guard plate 71 and a connecting guard plate 72 .

[0114] Furthermore, the prefabricated pipe section 61 is provided with a bolt joint 721 for connecting the guard plate 7 and the prefabricated pipe section 61 by bolting; a water stop groove 722 is provided between the prefabricated pipe section 61 and the guard plate 7, and a water-swellable rubber pad 723 can be provided inside, which plays a role of water stop between structures after the prefabricated pipe section 61 and the guard plate 7 are connected and sealed, so as to prevent groundwater in the side wall soil of the foundation pit 200 from entering the interior of the foundation pit 200 through the connection between the guard plate 7 and the prefabricated structure;

[0115] A connecting groove 614 is left on the prefabricated pipe section 61, and the connecting groove 614 is used to connect with the top prefabricated plate. It can be connected using various existing pipe section connection methods. The bottom has a steel bar connector and a roughened concrete surface, which can better connect with the steel bars and concrete structure of the bottom concrete.

[0116] The connecting guard plate 72 is generally a steel structure with an "L"-shaped bottom, which can be easily connected to the prefabricated pipe segment 61 structure. The bottom of the guard plate 7 is provided with screw holes connected to the prefabricated structure, which can be connected and fixed with the bolt joints reserved on the prefabricated pipe segment 61.

[0117] Furthermore, the "L"-shaped structure of the connecting guard plate 72 may also be equipped with a fixing device 724, which can form a triangular support through welding or bolting, so as to better withstand the pressure of the side wall soil and avoid deformation, bending and other problems of the connecting guard plate 72 caused by stress concentration due to the "L"-shaped structure.

[0118] The present invention further provides a foundation pit excavation and support method, using the sunken frame excavation machine 100 as described above, the foundation pit excavation and support method comprising:

[0119] S1. The foundation pit to be excavated is divided into a plurality of excavation units along the length direction, and each excavation unit is divided into two excavation stages, and the sunken frame excavation machine 100 is set up in the length direction of the foundation pit to be excavated 200;

[0120] S2. Excavate the soil of the first excavation unit in the first excavation stage. After the first excavation stage of the first excavation unit is completed, excavate the first excavation stage of the second excavation unit. At the same time, use the excavation device 33 of the sunken frame excavator 100 to excavate the first excavation unit in the second excavation stage. After the second excavation stage is completed, use the assembly system 3 to support the first excavation unit after the excavation is completed.

[0121] S3. After the first excavation stage of the second excavation unit is completed, the first excavation stage of the third excavation unit is excavated, and the assembly system 3 is moved and the assembly system 3 is used to perform the second excavation stage of excavation and support for the second excavation unit after the excavation is completed;

[0122] S4. After the support of the first excavation unit is completed by the assembly system 3, the main structure is constructed inside the first excavation unit, and synchronous backfilling operations are carried out after the main construction is completed;

[0123] S5. And so on, repeat the process of S1 to S4 to complete the construction work of the entire foundation pit.

[0124] In an optional embodiment of the present invention, the specific implementation process of the foundation pit excavation and support method is as follows:

[0125] S1. The sunken frame excavation machine 100 is installed in the length direction of the foundation pit 200;

[0126] S2. First, the excavation and hoisting system 2 excavates the foundation pit 200. At this time, the existing excavator equipment on site can be used to jointly excavate the soil of the first excavation stage of the first excavation unit. After the first excavation stage of the first excavation unit is completed, the excavation and hoisting system 2 tows or advances by itself to a distance of one support unit to excavate the second excavation unit. At this time, the first assembly system 3 follows closely to support the first excavation area, and further excavates the foundation pit 200 to a predetermined depth (second excavation stage) in combination with the excavator equipment;

[0127] S3. After the excavation and hoisting system 2 is used to perform the first excavation stage of the second excavation unit, it continues to advance to a distance of a support unit, at which time the second assembly system 3 is in place and assembled at the rear of the excavation and hoisting system 2 to complete the excavation of the second excavation stage of the second excavation unit;

[0128] S4. After the assembly system 3 completes the excavation and support of the area, the main structure is constructed inside, and after the main construction is completed, the guard plate 7 is gradually pulled upwards, the synchronous backfilling operation is carried out, and the foundation pit area is exited.

[0129] S5. And so on, repeat the process of S1 to S4 to complete the construction work of the entire foundation pit 200.

[0130] Please refer to Figures 1 to 28 Now, the specific implementation process of the sunken frame excavator 100 and the foundation pit excavation support method using the sunken frame excavator 100 proposed by the present invention will be described in detail in conjunction with the embodiments.

[0131] Embodiment 1

[0132] In this embodiment, the foundation pit excavation and support method includes:

[0133] S1. Preliminary preparation for construction: After the preliminary preparation for foundation pit construction such as site leveling and foundation pit dewatering, the equipment track 51 of the sunken frame excavator 100 is constructed at a certain distance from the side wall of the planned excavation direction. If necessary, an additional track foundation 53 is required to construct the equipment track 51. After the equipment track 51 is laid, the sunken frame excavator 100 equipment is set on the equipment track 51 and moves or is towed along the equipment track 51 to the designated excavation location;

[0134] S2. Foundation pit excavation construction: according to the layout of the foundation pit to be excavated, the excavator equipment is used to perform rough excavation of the foundation pit soil. At the same time, the excavation device of the excavation and lifting system 2 can assist in excavation and lifting of the soil at the front end of the sunken frame excavator 100. The milling head 332 at the bottom of the assembly system 3 cooperates with the excavator equipment to trim the side wall of the foundation pit 200, so that the guard plates 7 on both sides of the assembly system 3 can be smoothly sunk, and the assembly device 32 is synchronously extended and retracted to drive the guard plates 7 to support the side wall soil of the foundation pit 200;

[0135] S3. Guard plates support the soil on the side walls: When the foundation pit 200 is excavated to a specified depth, multiple guard plates 7 driven by multiple assembly devices 32 support the soil. At this time, the lower guard plate support system is replaced by a steel support from the assembled structure 6, and the guard plates 7 are connected and stabilized using connecting parts such as buckles. After that, the assembled structure 6 can be released to drive more guard plates 7 to support the soil on the side walls of the upper part of the foundation pit 200;

[0136] S4. Construction of internal structure: After the excavation is completed, a concrete bottom seal is constructed at the bottom of the foundation pit 200 to prevent water and mud seepage from the bottom of the foundation pit 200. After the bottom seal is completed, the steel guard plate and the steel support structure are gradually dismantled, and the initial support of wet concrete is sprayed upward from the bottom of the foundation pit 200, and the permanent structure is constructed;

[0137] S5. Disassembly and backfilling operations: Under the synchronous support of the steel guard plate and steel support of the prefabricated structure 6, the construction of the permanent structure begins inside the foundation pit 200. After the permanent structure construction is completed, the steel guard plate structure is lifted in sequence using the assembly device 32, and the steel support components are removed, and synchronous backfilling operations are carried out on the upper part of the permanent structure.

[0138] Embodiment 2

[0139] The specific application steps of the sunken frame excavator 100 for prefabricated modular structure construction are as follows:

[0140] S1. Pre-construction preparation work: the same as S1 above;

[0141] S2. Foundation pit excavation construction: according to the layout of the proposed foundation pit, the excavator equipment is used to perform rough excavation of the foundation pit soil. At the same time, the excavation and lifting system 2 can assist in excavation and lifting of the soil at the front end of the sinking frame excavation machine. The milling head 332 at the bottom of the assembly system 3 cooperates with the excavator equipment to trim the side wall of the foundation pit 200, so that the prefabricated structures on both sides of the assembly system 3 sink smoothly, and the assembly device 32 is retracted synchronously to drive the prefabricated structure to support the side wall soil of the foundation pit 200;

[0142] S3. Prefabricated structure supports the side wall soil: When excavating to the specified depth, the prefabricated assembled structure 6 has entered the predetermined structural position with the sinking of the assembly device 32. During the synchronous sinking of the prefabricated assembled structure 6, the assembled structure 6 and the guard plate 7 are connected by the connecting device 62, and the guard plates 7 are connected by connecting buckles. Under the assembly and support of the assembly device 32, they jointly bear the soil pressure of the side wall of the foundation pit 200. At this time, the lower guard plate support system is replaced by steel support from the assembled structure 6, which can free the assembled structure 6 to drive more guard plates 7 to support the side wall soil of the upper part of the foundation pit 200;

[0143] S4. Construction of internal structure: After the excavation is completed, a concrete bottom seal is constructed at the bottom of the foundation pit 200 to connect with the prefabricated structure 6. At the same time, under the action of the internal support system, the connecting device 62 between the guard plate 7 and the prefabricated structure 6 is released, and the prefabricated structure is used to carry the prefabricated cover plate 611 and the prefabricated side wall pipe section 612 to complete the assembly of the prefabricated structure under the protection of the steel guard plate and the steel support 10;

[0144] S5. Disassembly and backfilling: After the prefabricated structure is assembled, the assembly device 32 is used to sequentially lift the guard plate 7 structure, remove the steel support 10, and carry out synchronous backfilling on the upper part of the prefabricated structure.

[0145] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A sunken frame excavator, characterized in that: The sunken frame excavator (100) comprises a main truss (1) and at least one assembly system (3) arranged on the main truss (1), wherein the assembly system (3) comprises: A suspension rod device (31) is arranged on the main truss (1), and a telescopic mechanism (311) is arranged at the bottom of the suspension rod device (31); An assembly device (32) connected to the telescopic mechanism (311) and capable of moving up and down under the drive of the telescopic mechanism (311), the assembly device (32) being used to support the guard plate (7) or the assembled structure (6) to a specified position; An excavation device (33) is fixedly connected to the bottom of the assembly device (32), and the excavation device (33) is used to excavate and / or trim the foundation pit (200) below the assembly device (32).

2. The sunken frame excavator according to claim 1, characterized in that: The assembly device (32) comprises: A mounting seat connected to the bottom end of the telescopic mechanism (311) and driven by the telescopic mechanism (311) to move up and down; Two mounting mechanisms are symmetrically arranged on opposite sides of the mounting seat, each of the mounting mechanisms can be detachably connected to the guard plate (7) or the assembled structure (6), and each of the mounting mechanisms can push the guard plate (7) or the assembled structure (6) to move horizontally to the side of the foundation pit (200).

3. The sunken frame excavator as claimed in claim 2, characterized in that: The mounting mechanism comprises: More than two mounting rods (323) are arranged on the mounting seat at intervals, and each mounting rod (323) is a telescopic rod; The driving components are respectively connected to the installation rods (323) and drive the installation rods (323) to extend and retract.

4. The sunken frame excavator according to claim 1, characterized in that: The excavation device (33) comprises at least one excavation mechanism, and the excavation mechanism comprises a working arm (331) and a milling head (332), one end of the working arm (331) is rotatably connected to the assembly device (32), and the other end of the working arm (331) is connected to the milling head (332).

5. The sunken frame excavator according to claim 1, characterized in that: The main truss (1) comprises a plurality of load-bearing frames arranged in sequence and at intervals along the length direction of the foundation pit, the load-bearing frames comprising a first transverse truss (11) and two vertical trusses (12), the first transverse truss (11) being arranged horizontally and spanning the foundation pit (200), the two vertical trusses (12) being supported at both ends of the first transverse truss (11), and two adjacent load-bearing frames being connected via a plurality of second transverse trusses (13) being arranged horizontally.

6. The sunken frame excavator as claimed in claim 5, characterized in that: The suspension rod device (31) comprises a plurality of suspension rods (312) arranged at intervals in a vertical direction, the top of each suspension rod being connected to the first transverse truss (11), and the bottom of each suspension rod (312) being provided with the telescopic mechanism (311).

7. The sunken frame excavator according to claim 1, characterized in that: The sunken frame excavator further comprises an excavation and hoisting system (2), wherein the excavation and hoisting system (2) comprises: A lifting truss (21) is horizontally arranged on the main truss (1); A walking beam (22) is fixedly connected below the lifting truss (21), and two ends of the walking beam (22) can extend out of two sides of the main truss (1) in a horizontal direction; At least one grab bucket (25) is slidably arranged on the walking beam (22), and the grab bucket (25) is used to dig the foundation pit below the lifting truss (21) and lift earth.

8. The sunken frame excavator as claimed in claim 7, characterized in that: The walking beam (22) is provided with a pulley assembly (23) which can reciprocate along the length direction of the walking beam (22); the grab bucket (25) is suspended on the pulley assembly (23) through a steel cable (24); and the steel cable (24) can drive the grab bucket (25) to move up and down.

9. The sunken frame excavator as claimed in claim 1, characterized in that: The sunken frame excavator further comprises a walking system (5), wherein the walking system (5) comprises a walking wheel device (52) and equipment tracks (51) arranged on both sides of the foundation pit (200), wherein the walking wheel device (52) is arranged at the bottom of the main truss (1) and is in rolling cooperation with the equipment track (51).

10. A foundation pit excavation support method, characterized in that: The foundation pit excavation and support method comprises: S1. Dividing the foundation pit (200) to be excavated into a plurality of excavation units along the length direction, and dividing each of the excavation units into two excavation stages, and setting up a sunken excavation machine (100) in the length direction of the foundation pit (200) to be excavated; S2. Excavating the soil of the first excavation unit in the first excavation stage, after the first excavation stage of the first excavation unit is completed, excavating the first excavation stage of the second excavation unit, and using the excavation device (33) of the sunken frame excavator (100) to excavate the first excavation unit in the second excavation stage, after the second excavation stage is completed, using the assembly device (32) to support the first excavation unit after the excavation is completed; S3. After the first excavation stage of the second excavation unit is completed, the first excavation stage of the third excavation unit is excavated, and at the same time, the assembly system (3) is moved and the assembly system (3) is used to perform excavation and support for the second excavation stage of the second excavation unit after the excavation is completed; S4. After the assembly system (3) completes the support of the first excavation unit, the main structure is constructed inside the first excavation unit, and after the main structure construction is completed, a synchronous backfill operation is carried out; S5. And so on, repeat the process of S1 to S4 to complete the construction work of the entire foundation pit.

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