Railway engineering foundation pit construction support

Abstract

The invention relates to the technical field of foundation pit supports, in particular to a railway engineering foundation pit construction support which comprises a bearing frame, a concentric-square-shaped frame is installed on the bearing frame, the bearing frame and the concentric-square-shaped frame jointly form a concentric-square-shaped support, a locking mechanism is arranged on the concentric-square-shaped frame, and a partition mechanism is arranged on the locking mechanism. The bearing frame and the concentric-square-shaped frame are assembled into the concentric-square-shaped support, the mode of quick disassembly and quick assembly is adopted, preparation work in the early stage of construction can be effectively reduced, then the construction period is shortened, the construction cost is reduced, and meanwhile later disassembly is facilitated; according to the hollow-square-shaped support, the strength of the hollow-square-shaped support in the using process is improved, it is guaranteed that the hollow-square-shaped support does not incline or shake due to external force, meanwhile, the multiple isolation plates are inserted into the connecting plate, the strength of the hollow-square-shaped support is further improved under the condition that sandy soil is prevented from entering, and therefore the safety performance of construction is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit supports, and in particular to a railway engineering foundation pit construction support. Background Art

[0002] The foundation pit construction support is a temporary structure used to support the side walls of the foundation pit and prevent soil collapse during construction. When conducting deep foundation pit excavation operations, appropriate support measures need to be taken to ensure construction safety and the safety and stability of the surrounding environment. The foundation pit construction support in railway projects is mainly used to ensure the safety and stability of the foundation pit during railway construction, especially during the construction of structures such as bridge piers, tunnel entrances and exits, and underground stations.

[0003] There are many types of foundation pit construction supports in railway projects. According to different geological conditions, foundation pit depth, surrounding environment and other factors, they can be specifically divided into steel sheet piles, underground connecting walls and concrete cast-in-place piles. The erection of railway project foundation pit construction supports is a complex and delicate process. For example, the erection of underground continuous walls first requires digging installation grooves along the markings according to the drawings, then placing the steel cage into the installation grooves, and finally pouring concrete into a continuous wall through the conduit.

[0004] Although the above-mentioned method of erecting foundation pit construction scaffolds is relatively common, it still has certain disadvantages. First of all, no matter which type of foundation pit scaffold is used, it requires a large cost and takes a long time from design to implementation and finally to final demolition, and a relatively stable construction period cannot be guaranteed. At the same time, some scaffolds may be difficult to dismantle due to their different erection methods, such as steel sheet piles, concrete bored piles, etc., which further extends the construction period and increases the project cost. Summary of the invention

[0005] In view of the above problems, the embodiment of the present application provides a railway engineering foundation pit construction support to solve the problems existing in the erection of the foundation pit support in the railway engineering.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present application provides the following technical solution: a railway engineering foundation pit construction support, including a support frame, the support frame is divided into a U-shaped installation section and support sections fixedly arranged at the four corners of the installation section along the vertical direction, the cross-section of the support section is L-shaped and the right angle of the support section and the right angle of the support frame installation section are located on the same vertical line, a U-shaped frame is installed on the support frame, and the support frame and the U-shaped frame together constitute a U-shaped support.

[0007] The upper end surfaces of the four straight sides of the return frame are provided with matching groove groups in a matrix manner, each matching groove group includes two rectangular connecting through grooves, and locking mechanisms that cooperate with the support frame are respectively arranged at the center positions of the four straight sides of the return frame.

[0008] The described locking mechanism includes a U-shaped mounting block fixedly arranged between two rectangular connecting through grooves of the same mating groove group and opening downward. The vertical section of the U-shaped mounting block close to the inside of the looped frame is longer than the vertical section outside the looped frame. Mounting grooves are formed on the outer side walls of the front and rear U-shaped mounting blocks. A locking portion connected to the next railway engineering foundation pit construction support is arranged inside the mounting groove. Connecting portions for connecting with the two support sections of the corresponding support frame are arranged inside the four U-shaped mounting blocks. A partition mechanism for isolating a small amount of sand from entering the inside of the looped support is arranged on the connecting portion.

[0009] The described partition mechanism is arranged between the looped frame and the support frame. The partition mechanism includes a plurality of isolation plates inserted on the connecting portion, and a clamping portion that cooperates and locks with each other is arranged inside the plurality of isolation plates.

[0010] Preferably, plug-in groups are arranged on the lower end faces of the four straight edges of the support frame installation section corresponding to the four mating groove groups. Each plug-in group includes a rectangular pressing block with a rectangular through groove formed on the side. Plug-in groove groups are formed on the upper end faces of the four straight edges of the support frame installation section corresponding to the positions of the rectangular pressing blocks. Each plug-in groove group includes a plurality of strip-shaped grooves that are connected and used for inserting the isolation plates. Two strip-shaped sliding grooves are respectively formed in the four support sections of the support frame along the vertical direction. The two strip-shaped sliding grooves are arranged at the ends of the L-shaped support sections away from each other. Three circular through grooves that are distributed in the up-and-down direction and penetrate the strip-shaped sliding grooves are further formed on the outer side walls of the four support sections of the support frame. Strip-shaped through groove one is symmetrically formed on the front and rear outer side walls of the support frame.

[0011] Preferably, a strip-shaped through groove two that penetrates the rectangular connecting through groove and the looped frame is formed on the outer side wall of the looped frame corresponding to the position of the rectangular connecting through groove. A T-shaped top block for locking the rectangular pressing block is slidably arranged inside the inner strip-shaped through groove two through a spring.

[0012] Preferably, the connecting portion includes two rotating rollers rotatably arranged inside the U-shaped mounting block. Connecting plates are fixedly arranged on the circumferential outer walls of the two rotating rollers. Avoidance through grooves corresponding to the positions of the strip-shaped grooves are formed on the connecting plates. A sliding block is slidably arranged inside the strip-shaped sliding groove. The bottom ends of the two connecting plates inside the U-shaped mounting block are respectively rotatably arranged inside the sliding blocks on both sides through pin shafts. A hexagonal through groove that penetrates the sliding block and the connecting plate is formed on the side wall of the sliding block. Four connecting groups for commonly connecting a plurality of sliding blocks are installed on the looped support in a way that they are connected end to end in sequence.

[0013] Preferably, the connection group includes a plug rod. One end of the plug rod is fixedly provided with a cylindrical platform, and a circular through hole perpendicular to its axis is provided on the cylindrical platform. A hexagonal block is arranged at the end of the cylindrical platform in a threaded fit manner. The other end of the plug rod is provided with a locking groove with a hexagonal outer wall and a circular inner part. The circular through hole on the cylindrical platform is in through fit with the adjacent plug rod.

[0014] Preferably, a locking pin is arranged at the end of the plug rod where the locking groove is provided. A hexagonal chuck for cooperating with the locking groove is fixedly arranged at one end of the locking pin close to the locking groove. A square block is fixedly arranged on the circumferential outer wall of the locking pin. A sleeve is sleeved on the outer wall of the locking pin through a torsion spring. A square sliding groove is arranged on the inner wall of the sleeve along its length direction, and an annular groove communicating with the square sliding groove is also arranged on the inner wall of the sleeve.

[0015] Preferably, the lower end of the isolation plate passes through the rectangular connection through groove and the avoidance through groove and is clamped inside the strip groove. The clamping part includes a telescopic clamping block slidably arranged on the lower end surface of the isolation plate through a spring. A limiting hole is arranged on the isolation plate. Adjacent two isolation plates are clamped and limited through the telescopic clamping block. The clamping part also includes three unlocking groups arranged symmetrically in the front and back and distributed in the left - right direction inside the support frame.

[0016] Preferably, the unlocking group in the middle includes a top plate one slidably arranged in the strip through groove one through a spring and symmetrically arranged in the left - right direction. Chamfers are arranged on the side walls of the two top plates one close to each other, and the ends of the two top plates one far from each other are respectively in close contact with the telescopic clamping blocks on the corresponding isolation plates. The unlocking groups on the left and right sides include L - shaped top plate assemblies slidably penetrating through the outer wall of the installation section of the support frame through springs. A clamping hole is arranged outside the L - shaped top plate assemblies. The L - shaped top plate assemblies are in locking fit with the limiting holes on the isolation plates at the upper corners of the support frame through the action of springs.

[0017] Preferably, the U - shaped bracket is installed in the engineering foundation pit. Slide rails are symmetrically and fixedly arranged on the ground surface on the front and back sides of the U - shaped bracket. A sliding block with an arc - shaped block arranged on its upper end surface is slidably arranged on the outer wall of the slide rail.

[0018] Preferably, the locking part includes a circular roller rotatably arranged inside the installation groove. A telescopic connecting plate with two installation round grooves opened at its lower end and抵触 with the arc - shaped block is fixedly arranged on the outer wall of the circular roller. The telescopic connecting plate is turned upwards to be in close contact with the longer vertical section of the C - shaped installation block and is locked through bolts and nuts.

[0019] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0020] 1. The present invention assembles a return bracket into a return bracket by means of a support frame and a return bracket, and adopts a quick disassembly and quick assembly method, which can effectively reduce the preparatory work in the early stage of construction, thereby shortening the construction period, reducing the construction cost, and also facilitating the later disassembly.

[0021] 2. The present invention is provided with a plurality of plug-in rods, which can improve the strength of the circular bracket during use by mutual cooperation and plugging of the plug-in rods, and ensure that the circular bracket will not be skewed or shaken by external forces. At the same time, a plurality of isolation plates are inserted in the connecting plate, which further improves the strength of the circular bracket while preventing sand and soil from entering, thereby ensuring the safety performance of the construction.

[0022] 3. The present invention supports the circular bracket protruding from the ground by cooperating with the sliding block through the telescopic connecting plate, so as to form a stable triangular structure. Secondly, as the depth of the foundation pit increases, when the circular brackets are stacked, the two circular brackets stacked up and down can be locked into one by the telescopic connecting plate, thereby further improving the structural strength of the stacked circular brackets. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0024] Figure 2 It is a three-dimensional schematic diagram of two circular brackets connected in the present invention.

[0025] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0026] Figure 4 It is a schematic diagram of the planar structure of the circular bracket in the present invention.

[0027] Figure 5 It is a schematic diagram of the internal structure of the circular bracket in the present invention.

[0028] Figure 6 It is a partial structural schematic diagram of the connecting part in the present invention.

[0029] Figure 7 It is an exploded view of the locking pin and the plug rod in the present invention.

[0030] Figure 8 It is a schematic diagram of the planar structure of the clamping portion in the present invention.

[0031] Fig. 9 yes Figure 8 A partial enlarged view of point B in the middle.

[0032] Fig.10 It is a schematic diagram of the positional relationship between the return bracket and the slide rail in the present invention.

[0033] Fig.11It is a cross-sectional view between the L-shaped top plate assembly and the support frame of the present invention.

[0034] Reference numerals in the figure: 1, support frame; 11, rectangular pressing block; 111, rectangular through groove; 12, strip groove; 13, strip sliding groove; 14, circular through groove; 15, first strip through groove; 2, U-shaped frame; 21, rectangular connecting through groove; 22, second strip through groove; 23, T-shaped top block; 3, locking mechanism; 31, C-shaped mounting block; 311, mounting groove; 32, locking part; 321, circular rotating roller; 322, telescopic connecting plate; 3221, mounting circular groove; 33, connecting part; 331, rotating roller; 332, connecting plate; 333, avoidance through groove; 334, sliding block; 335, connecting group; 3351, inserting rod; 3352, locking pin; 3353, square block; 3354, hexagonal clamping block; 3355, pin sleeve; 3356, cylindrical platform; 3357, hexagonal block; 4, partition mechanism; 41, isolation plate; 3, locking mechanism; 42, clamping part; 421, telescopic clamping block; 422, unlocking group; 4221, first top plate; 4222, L-shaped top plate assembly; 5, slide rail; 51, sliding block; 511, arc-shaped stop block. Detailed implementation manners

[0035] The following is further detailed description of this application Figure 1-11 in conjunction with the appended drawings.

[0036] Please refer to Figure 1 and Figure 2 , a construction support for railway engineering foundation pits, including a support frame 1. The support frame 1 is divided into a U-shaped installation section and support sections vertically fixed at the four corners of the installation section. The cross-section of the support section is L-shaped, and the right angle of the support section and the right angle of the installation section of the support frame 1 are on the same vertical line. A U-shaped frame 2 is installed on the support frame 1, and the support frame 1 and the U-shaped frame 2 together form a U-shaped support.

[0037] Please refer to Figure 1 and Figure 5 , upper end faces of four straight edges of the U-shaped frame 2 are all provided with a set of mating grooves. Each set of mating grooves includes two rectangular connecting through grooves 21, and locking mechanisms 3 for cooperating with and locking the support frame 1 are respectively arranged at the central positions of the four straight edges of the U-shaped frame 2.

[0038] Please refer to Figure 1 , Figure 2 and Figure 3, the locking mechanism 3 includes a U-shaped mounting block 31 fixedly arranged between two rectangular connecting through slots 21 of the same mating slot group and opening downward. The vertical section of the U-shaped mounting block 31 close to the inside of the return frame 2 is longer than the vertical section outside the return frame 2. Mounting slots 311 are provided on the outer side walls of the front and rear U-shaped mounting blocks 31. A locking portion 32 connected to the next railway engineering foundation pit construction support is arranged inside the mounting slots 311. Connecting portions 33 for connecting with the two support sections of the corresponding support frame 1 are arranged inside the four U-shaped mounting blocks 31. A partition mechanism 4 for isolating a small amount of sand from entering the inside of the return support is arranged on the connecting portion 33.

[0039] Please refer to Figure 5 and Figure 8 , the partition mechanism 4 is arranged between the return frame 2 and the support frame 1. The partition mechanism 4 includes a plurality of isolation plates 41 inserted on the connecting portion 33. A clamping portion 42 that cooperates and locks with each other is arranged inside the plurality of isolation plates 41.

[0040] During specific operation, first, a worker assembles a return support by combining the return frame 2 and the support frame 1. Subsequently, control the connecting portion 33 to fixedly connect the return frame 2 and the support frame 1 to ensure the stability of the return support. Then, continue to insert a plurality of isolation plates 41 for isolating sand into the connecting portion 33 manually. Finally, lock and fix adjacent two isolation plates 41 and the isolation plates 41 and the support frame 1.

[0041] As the project progresses, when it is necessary to increase the height of the return support, take out a new support frame 1 and return frame 2 and install them on the lower return support, repeat the above installation steps to complete the erection work of the new return support. Subsequently, the locking portion 32 cooperates to turn upward along the bottom edge, and a worker uses bolts and nuts to fixedly connect the upper and lower return supports.

[0042] Please refer to Figure 4 and Figure 6 , corresponding to the four mating slot groups, plug-in groups are provided on the lower end faces of the four straight edges of the installation section of the support frame 1. Each plug-in group includes a rectangular pressing block 11 with a rectangular through slot 111 opened on the side. Corresponding to the position of the rectangular pressing block 11, two plug-in slot groups are opened on the upper end faces of the four straight edges of the installation section of the support frame 1. Each plug-in slot group includes a plurality of strip-shaped slots 12 that are connected and used for inserting the isolation plates 41. Two strip-shaped sliding slots 13 are respectively opened in the four support sections of the support frame 1 along the vertical direction. The two strip-shaped sliding slots 13 are arranged at the ends of the L-shaped support sections away from each other. Three circular through slots 14 that are distributed in the up-and-down direction and penetrate the strip-shaped sliding slots 13 are further opened on the outer side walls of the four support sections of the support frame 1. Strip-shaped through slots one 15 are symmetrically opened on the front and rear outer side walls of the support frame 1.

[0043] Please refer to Figure 3 , Figure 6 and Figure 7 , the connecting part 33 includes two rotating rollers 331 rotatably arranged inside the C-shaped mounting block 31. A connecting plate 332 is fixedly arranged on the circumferential outer wall of the two rotating rollers 331. Avoidance through grooves 333 corresponding to the positions of the strip grooves 12 are formed in the connecting plate 332. A sliding block 334 is slidably arranged inside the strip-shaped sliding groove 13. The bottom ends of the two connecting plates 332 inside the C-shaped mounting block 31 are respectively rotatably arranged inside the sliding blocks 334 on both sides through pin shafts. A hexagonal through groove penetrating through the sliding block 334 and the connecting plate 332 is formed in the side wall of the sliding block 334. Four connecting groups 335 for commonly connecting a plurality of sliding blocks 334 are installed on the return-shaped bracket in a manner of being connected end to end in sequence.

[0044] Please refer to Figure 6 and Figure 7 , the connecting group 335 includes a plugging rod 3351. One end of the plugging rod 3351 is fixedly provided with a cylindrical platform 3356, and a circular through hole perpendicular to its axis is formed in the cylindrical platform 3356. A hexagonal block 3357 is arranged at the end of the cylindrical platform 3356 in a threaded fit manner. The other end of the plugging rod 3351 is provided with a locking groove with a hexagonal outer wall and a circular inner part. The circular through hole on the cylindrical platform 3356 is in through fit with the adjacent plugging rod 3351.

[0045] Please refer to Figure 6 and Figure 7 , a locking pin 3352 is arranged in a matching manner at the end of the plugging rod 3351 where the locking groove is formed. A hexagonal clamping block 3354 for cooperating with the locking groove is fixedly arranged at one end of the locking pin 3352 close to the locking groove. A square block 3353 is fixedly arranged on the circumferential outer wall of the locking pin 3352. A pin sleeve 3355 is sleeved on the outer wall of the locking pin 3352 through a torsion spring. A square sliding groove is arranged along the length direction of the inner wall of the pin sleeve 3355. An annular groove communicating with the square sliding groove is also formed in the inner wall of the pin sleeve 3355.

[0046] During the specific operation, first place the return frame 2 on the four supporting sections of the support frame 1, then slide the sliding block 334 into the corresponding strip-shaped slide groove 13, slide the sliding block 334 to the specified position according to the height of the supporting section of the support frame 1, and then insert the plug-in rod 3351 from one side first, and then pass the hexagonal block 3357 from the outside of the return frame through the corresponding circular through groove 14, the sliding block 334 and the circular through hole on the adjacent cylindrical platform 3356 in sequence, and then screw and fix it on the end of the cylindrical platform 3356, and then insert the hexagonal block 3357 into the circular through groove 14 at the opposite position on the other side of the plug-in rod 3351. Insert the pin sleeve 3355, the pin sleeve 3355 passes through the sliding block 334, and the pin sleeve 3355 and the circular through groove 14 have an interference fit, and then push the locking pin 3352 to make the hexagonal block 3354 embed into the locking groove of the plug-in rod 3351. At this time, the square block 3353 is located inside the annular groove, and due to the action of the torsion spring, the plug-in rod 3351 rotates a certain angle, so that the square block 3353 enters the annular groove to achieve relative fixation of the position between the locking pin 3352 and the pin sleeve 3355, and the locking work of the plug-in rod 3351 and the sliding block 334 is completed.

[0047] It should be noted that when the sliding block 334 completes the locking work, the corresponding two connecting plates 332 are limited so that they will not shake, and the plug-in rods 3351 and the cylindrical platform 3356 penetrate each other in sequence. By connecting the four plug-in rods 3351 into a whole, the supporting force of the circular bracket is enhanced to ensure that it will not shake or tip over due to external forces during subsequent use.

[0048] It should also be noted that when the sliding block 334 moves to correspond to different positions of the circular through groove 14, it is necessary to replace the connecting plate 332 of different lengths. The connecting plate 332 is not set as a telescopic structure in order to ensure the structural strength of the connecting plate 332.

[0049] Please refer to Figure 8 and Fig. 9 The lower end of the isolation plate 41 passes through the rectangular connecting groove 21 and the avoidance groove 333 and is clamped in the interior of the strip groove 12. The clamping portion 42 includes a telescopic clamping block 421 which is set on the lower end surface of the isolation plate 41 through a spring sliding. A limiting hole is set on the isolation plate 41. The two adjacent isolation plates 41 are clamped and limited by the telescopic clamping block 421. The clamping portion 42 also includes three unlocking groups 422 which are arranged in a front-to-back symmetrical manner inside the support frame 1 and distributed along the left-right direction.

[0050] Please refer to Figure 6 , Figure 8 , Fig. 9 and Fig.11The unlocking group 422 located in the middle includes a top plate 4221 which is symmetrical in the left and right directions and is set inside the strip-shaped through groove 15 by spring sliding. The side wall of the two top plates 4221 close to each other is provided with a chamfer, and the ends of the two top plates 4221 away from each other are respectively tightly attached to the telescopic card blocks 421 on the corresponding isolation plate 41. The unlocking groups 422 on the left and right sides include an L-shaped top plate assembly 4222 which slides through the outer wall of the mounting section of the support frame 1 by spring sliding. The outside of the L-shaped top plate assembly 4222 is provided with a card hole. The L-shaped top plate assembly 4222 is locked with the limiting hole on the isolation plate 41 at the upper corner position of the support frame 1 through the action of the spring.

[0051] When the circular bracket is completed and stabilized, several isolation panels 41 are manually inserted in sequence along the rectangular connecting groove 21 and the avoidance groove 333. When the lower end of the isolation panel 41 is inserted into the strip groove 12, the corresponding side walls of the strip groove 12 will preferentially push the telescopic card block 421 to retract until the isolation panel 41 is completely inserted into the strip groove 12. As the isolation panels 41 are subsequently inserted in sequence, the telescopic card block 421 of the subsequent isolation panel 41 will be inserted into the previous telescopic card block 421. In this way, the common locking work of multiple isolation panels 41 can be completed by reciprocating, and the telescopic card blocks 421 on the two middle isolation panels 41 will be engaged with the side walls of the strip groove 15, and the isolation panels 41 located at the corners will be engaged with the L-shaped top plate components 4222 at the corresponding positions.

[0052] It should be noted that when the isolation plate 41 is subsequently removed, it is preferred to use a tool to insert into the interior of the two front and rear strip through grooves 15, and use the tool to push the top plate 4221 to both sides respectively, so that the two top plates 4221 push against the telescopic blocks 421 respectively attached to their respective ones, and when the telescopic blocks 421 on the isolation plate 41 are pushed and retracted, the isolation plate 41 in the middle position and the strip groove 12 are unlocked. At the same time, a tool is used to pass through the card hole of the L-shaped top plate assembly 4222 and pull the L-shaped top plate assembly 4222 outward to complete the unlocking of the isolation plate 41 at the corner position. After all unlocking is completed, the isolation plate 41 can be pulled upward to complete the removal.

[0053] Please refer to Figure 1 and Fig.10 The return bracket is installed in the engineering foundation pit, and slide rails 5 are symmetrically fixed on the ground surface and located on the front and rear sides of the return bracket. The outer wall of the slide rail 5 is slidably provided with a sliding block 51 with an arc-shaped stopper 511 on the upper end surface.

[0054] Please refer to Figure 3 , Figure 5 and Figure 6, a strip-shaped through slot two 22 penetrating through the rectangular connection through slot 21 and the return-shaped frame 2 is formed at a position on the outer side wall of the return-shaped frame 2 corresponding to the rectangular connection through slot 21. A T-shaped top block 23 for locking the rectangular pressing block 11 is slidably arranged inside the inner strip-shaped through slot two 22 through a spring.

[0055] Please refer to Figure 3 and Fig.10 , the locking portion 32 includes a circular roller 321 rotatably arranged inside the installation slot 311. An expansion connecting plate 322 with two installation circular slots 3221 opened at the lower end and abutted against the arc-shaped blocking block 511 is fixedly arranged on the outer wall of the circular roller 321. The expansion connecting plate 322 is turned upwards to be closely attached to the longer vertical section of the C-shaped installation block 31 and locked by means of bolts and nuts.

[0056] During the actual use process, when it is necessary to increase the height of the return-shaped support, first place the expansion connecting plates 322 inside the front and rear installation slots 311 on the corresponding arc-shaped blocking blocks 511 respectively. Then place a new bearing frame 1 on the upper end surface of the return-shaped support, push the new bearing frame 1 to make the rectangular pressing block 11 on the lower end surface of the new bearing frame 1 snap into the corresponding rectangular connection through slot 21. The T-shaped top block 23 snaps into the rectangular through slot 111 of the corresponding rectangular pressing block 11 through the resilience. Thus, the connection work between the return-shaped support and the new bearing frame 1 is completed. Subsequently, repeat the above connection steps to build a new return-shaped support. After the building is completed, push the two return-shaped supports into the foundation pit through a pressing device.

[0057] When the lower return-shaped support moves, the expansion connecting plate 322 slides along the slide rail 5 and is compressed through the cooperation between the ground and the expansion connecting plate 322. As the lower return-shaped support gradually moves downwards, the lower expansion connecting plate 322 is jacked up by the ground and is closely attached to the C-shaped installation block 31 of the upper return-shaped support through the inner side wall of the foundation pit. Finally, the upper and lower return-shaped supports are fixedly connected by bolts and nuts manually, and the fixing work of multiple return-shaped supports can be completed.

[0058] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the embodiments of the present invention. In addition, in the description of the present invention, unless otherwise specified, the meanings of "multiple", "multiple roots", and "multiple groups" are two or more.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A railway engineering foundation pit construction support, comprising a support frame (1), characterized in that: The described support frame (1) is divided into a loop-shaped installation section and support sections fixedly arranged vertically at the four corners of the installation section. The cross-section of the support section is L-shaped, and the right angle of the support section and the right angle of the installation section of the support frame (1) are on the same vertical line. A loop-shaped frame (2) is installed on the support frame (1), and the support frame (1) and the loop-shaped frame (2) together form a loop-shaped support bracket; On the upper end surfaces of the four straight sides of the loop-shaped frame (2), a set of mating grooves is arranged in a matrix manner. Each set of mating grooves includes two rectangular connecting through grooves (21), and locking mechanisms (3) for mating and locking with the support frame (1) are respectively arranged at the central positions of the four straight sides of the loop-shaped frame (2); The described locking mechanism (3) includes a U-shaped mounting block (31) fixedly arranged between the two rectangular connecting through grooves (21) of the same set of mating grooves and opening downward. The vertical section of the U-shaped mounting block (31) close to the inside of the loop-shaped frame (2) is longer than the vertical section outside the loop-shaped frame (2). Mounting grooves (311) are arranged on the outer side walls of the front and rear U-shaped mounting blocks (31). A locking portion (32) for connecting with the next railway engineering foundation pit construction support bracket is arranged inside the mounting groove (311). Connecting portions (33) for connecting with the two support sections of the corresponding support frame (1) are arranged inside the four U-shaped mounting blocks (31). A partition mechanism (4) for isolating a small amount of sand from entering the inside of the loop-shaped support bracket is arranged on the connecting portion (33); The described partition mechanism (4) is arranged between the loop-shaped frame (2) and the support frame (1). The partition mechanism (4) includes a plurality of isolation plates (41) inserted on the connecting portion (33), and a clamping portion (42) for mating and locking is arranged inside the plurality of isolation plates (41).

2. A railway engineering foundation pit construction support according to claim 1, characterized in that: On the lower end surfaces of the four straight sides of the installation section of the support frame (1), a set of insertion components is arranged corresponding to the four sets of mating grooves. Each set of insertion components includes a rectangular pressing block (11) with a rectangular through groove (111) opened on the side. At the positions corresponding to the rectangular pressing blocks (11) on the upper end surfaces of the four straight sides of the installation section of the support frame (1), two sets of insertion slots are opened. Each set of insertion slots includes a plurality of strip-shaped grooves (12) that are connected and used for inserting the isolation plates (41). Two strip-shaped sliding grooves (13) are respectively arranged vertically on the four support sections of the support frame (1). The two strip-shaped sliding grooves (13) are arranged at the ends of the L-shaped support section that are far away from each other. Three circular through grooves (14) that are distributed vertically and penetrate the strip-shaped sliding grooves (13) are also opened on the outer side walls of the four support sections of the support frame (1). Strip-shaped through grooves one (15) are symmetrically opened on the front and rear outer side walls of the support frame (1).

3. A railway engineering foundation pit construction support according to claim 1, characterized in that: At the positions corresponding to the rectangular connecting through grooves (21) on the outer side wall of the loop-shaped frame (2), strip-shaped through grooves two (22) that penetrate the rectangular connecting through grooves (21) and the loop-shaped frame (2) are opened. Inside the inner strip-shaped through groove two (22), a T-shaped top block (23) for locking the rectangular pressing block (11) is slidably arranged through a spring.

4. A railway engineering foundation pit construction support according to claim 1, characterized in that: The described connecting portion (33) includes two rotating rollers (331) rotatably arranged inside the U-shaped mounting block (31). A connecting plate (332) is fixedly arranged on the circumferential outer wall of the two rotating rollers (331). Avoidance through slots (333) corresponding to the positions of the strip-shaped slots (12) are formed in the connecting plate (332). A sliding block (334) is slidably arranged inside the strip-shaped sliding slot (13). The bottom ends of the two connecting plates (332) inside the U-shaped mounting block (31) are respectively rotatably arranged inside the sliding blocks (334) on both sides through pin shafts. A hexagonal through slot penetrating through the sliding block (334) and the connecting plate (332) is formed in the side wall of the sliding block (334). Four connecting groups (335) for jointly connecting a plurality of sliding blocks (334) are installed on the loop-shaped bracket in a way that the head and tail are connected in sequence.

5. A railway engineering foundation pit construction support according to claim 4, characterized in that: The described connecting group (335) includes a plugging rod (3351). One end of the plugging rod (3351) is fixedly provided with a cylindrical platform (3356), and a circular through hole perpendicular to its axis is formed in the cylindrical platform (3356). A hexagonal block (3357) is arranged at the end of the cylindrical platform (3356) through a threaded fit. The other end of the plugging rod (3351) is provided with a locking slot with a hexagonal outer wall and a circular inner wall. The circular through hole on the cylindrical platform (3356) is in through fit with the adjacent plugging rod (3351).

6. A railway engineering foundation pit construction support according to claim 5, characterized in that: A locking pin (3352) is arranged in a matching manner at the end of the plugging rod (3351) where the locking slot is formed. A hexagonal clamping block (3354) for cooperating with the locking slot is fixedly arranged at one end of the locking pin (3352) close to the locking slot. A square block (3353) is fixedly arranged on the circumferential outer wall of the locking pin (3352). A pin sleeve (3355) is sleeved on the outer wall of the locking pin (3352) through a torsion spring. A square sliding slot is arranged along the length direction of the inner wall of the pin sleeve (3355), and an annular slot communicating with the square sliding slot is also formed in the inner wall of the pin sleeve (3355).

7. A railway engineering foundation pit construction support according to claim 4, characterized in that: The lower end of the isolation plate (41) passes through the rectangular connecting through slot (21) and the avoidance through slot (333) and is clamped inside the strip-shaped slot (12). The clamping portion (42) includes a telescopic clamping block (421) slidably arranged on the lower end face of the isolation plate (41) through a spring. A limiting hole is arranged on the isolation plate (41). The adjacent two isolation plates (41) are clamped and limited through the telescopic clamping block (421). The clamping portion (42) further includes three unlocking groups (422) symmetrically arranged in the front and back and distributed in the left-right direction inside the support frame (1).

8. A railway engineering foundation pit construction support according to claim 7, characterized in that: The unlocking group (422) located in the middle includes a first top plate (4221) that is symmetrically arranged in the left-right direction and is slidably arranged inside the first strip-shaped through groove (15) through a spring. Chamfers are provided on one side wall of the two first top plates (4221) close to each other, and the ends of the two first top plates (4221) away from each other are respectively in close contact with the telescopic locking blocks (421) on the corresponding isolation plates (41). The unlocking groups (422) on the left and right sides include L-shaped top plate assemblies (4222) that are slidably penetrated through the outer wall of the installation section of the support (1) through springs. A card hole is provided on the outside of the L-shaped top plate assembly (4222), and the L-shaped top plate assembly (4222) is in locking cooperation with the limit hole on the isolation plate (41) at the upper corner position of the support (1) through the action of the spring.

9. A railway engineering foundation pit construction support according to claim 1, characterized in that: The loop-shaped bracket is installed in the engineering foundation pit. Slide rails (5) are symmetrically and fixedly arranged on the ground surface on the front and rear sides of the loop-shaped bracket. A sliding block (51) with an arc-shaped stop block (511) opened on the upper end surface is slidably arranged on the outer wall of the slide rail (5).

10. A railway engineering foundation pit construction support according to claim 1, characterized in that: The locking part (32) includes a circular roller (321) rotatably arranged inside the installation groove (311). A telescopic connecting plate (322) with two installation circular grooves (3221) opened at the lower end and in contact with the arc-shaped stop block (511) is fixedly arranged on the outer wall of the circular roller (321). The telescopic connecting plate (322) is turned upwards to be in close contact with the longer vertical section of the C-shaped installation block (31) and is locked by means of bolts and nuts.

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