Combined supporting device suitable for deep and narrow foundation pit

Abstract

The invention discloses a combined type supporting device suitable for a deep and narrow foundation pit, and relates to the technical field of foundation pit supporting, the combined type supporting device comprises a partition plate, a plurality of stand columns are fixedly installed on one side of the partition plate, a plurality of purlin beams are fixedly installed on one sides of the stand columns, and width adjusting structures are fixedly installed on one sides of the purlin beams; a supporting structure is fixedly mounted at the bottom of the width adjusting structure, and a splicing structure is fixedly mounted on one side of the partition plate. According to the combined supporting device suitable for the deep and narrow foundation pit, the sliding frame slides according to the depth of the deep and narrow foundation pit under the action of the width adjusting structure, and then the fixing block is driven to adjust the overall width of the bottom of the width adjusting structure; according to the combined type supporting device suitable for the deep and narrow foundation pit, self-adaptive adjustment can be conducted according to the width of the bottom of the deep and narrow foundation pit, the universality and the practical effect of the device are improved, the occupied space of the device can be reduced, and meanwhile the stable supporting effect can be provided.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and in particular to a combined support device suitable for deep and narrow foundation pits. Background Art

[0002] The modular support device, suitable for deep and narrow foundation pits, is a support structure constructed from standardized steel components connected through prefabricated connections. It is primarily used for deep and narrow foundation pits in densely populated urban areas with limited space. It is particularly suitable for use in sensitive environments such as those near important buildings, underground pipelines, or major traffic arteries, where strict control of pit deformation and minimization of construction impacts are crucial. The device's advantages lie in its modular design, which facilitates rapid installation and disassembly, and its flexible and adjustable support area, effectively adapting to complex geological conditions. It also significantly improves construction efficiency and reduces project costs.

[0003] The combined support devices suitable for deep and narrow foundation pits in the prior art have the problem of great difficulty in construction in narrow spaces during actual use, and are difficult to meet the strict requirements of deep foundation pits for stability and safety. At the same time, the traditional support devices for deep and narrow foundation pits use large-diameter steel connecting pillars as crown beam supports, which will greatly occupy the space in the pit, further squeezing the workers' working and construction space, and thus being detrimental to the normal operation of deep and narrow foundation pits.

[0004] Therefore, in order to solve the above problems, a combined support device suitable for deep and narrow foundation pits is proposed. Summary of the Invention

[0005] In order to make up for the shortcomings of the existing technology, there are problems such as great difficulty in construction in narrow spaces and difficulty in meeting the strict requirements of deep foundation pits on stability and safety. At the same time, the traditional support device of deep and narrow foundation pits uses large-diameter steel connecting pillars as crown beam supports, which will greatly occupy the space in the pit, further squeezing the workers' working and construction space, and thus being detrimental to the normal operation of deep and narrow foundation pits. A combined support device suitable for deep and narrow foundation pits is proposed.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a combined support device suitable for deep and narrow foundation pits, including a partition, a plurality of columns are fixedly installed on one side of the partition, a plurality of surrounding purlins are fixedly installed on one side of the column, a width adjustment structure is fixedly installed on one side of the surrounding purlin, the bottom of the width adjustment structure is fixedly installed with a supporting structure, a splicing structure is fixedly installed on one side of the partition, and the width adjustment structure includes a support plate fixedly installed on one side of the surrounding purlin, the bottom end of the support plate is fixedly connected to a base frame, a slide rail is provided at the end of the base frame, and a sliding frame is slidably connected to the inside of the slide rail, and the end of the sliding frame away from the base frame is fixedly connected to a fixed block, the top of the fixed block is rotatably connected to a telescopic support rod, and the top of the base frame is fixedly connected to a side support rod.

[0007] Preferably, a plurality of fixing holes penetrating the sliding frame are provided on one side of the sliding frame, and two insertion holes overlapping with the fixing holes are provided on the side of the base frame, and pins penetrating the fixing holes are inserted into the insertion holes.

[0008] Preferably, a fixing plate is fixedly connected to one side of the base frame, a spring push rod is fixedly connected to one side of the fixing plate, an output end of the spring push rod is fixedly connected to a wedge block, a circular hole is opened at the end of the latch, the size and shape of the inner wall of the circular hole are adapted to the size and shape of the outer wall of the wedge block, an operating block is fixedly connected to the outer wall of the wedge block, a movable groove is opened on the inner wall of the circular hole, which passes through one end of the latch, and the inner wall of the movable groove is plugged into the outer wall of the operating block.

[0009] Preferably, the top end of the telescopic support rod is rotatably connected to one side of the support plate, the middle portion of the telescopic support rod is threadedly connected with a locking bolt, and the top end of the side support rod is fixedly connected to the bottom of one side of the support plate.

[0010] Preferably, the supporting structure includes a base, the top of the base is fixedly connected to a frame, the middle of the frame is slidably connected to two screw rods, the tops of the two screw rods are commonly fixedly connected to a top frame, and a roller is installed at the bottom end of the fixed block, and the outer wall of the roller is slidably connected to the inside of the top frame.

[0011] Preferably, an oblique notch is provided on the top of the top frame, and the width of the top of the oblique notch is much greater than the width of the roller.

[0012] Preferably, a fixing piece is fixedly connected to one side of the fixing block, a plurality of threaded holes are opened on a side of the top frame away from the partition, and the fixing piece is fixedly connected to the threaded holes by bolts.

[0013] Preferably, the top of the frame is rotatably connected to a torsion nut, the inner wall of the torsion nut is threadedly connected to the outer wall of a screw rod, the bottom end of the torsion nut is installed with a synchronous belt transmission assembly, the middle part of the synchronous belt transmission assembly is threadedly connected to the outer walls of two screw rods, and the bottom ends of the two screw rods are fixedly connected to a limit plate.

[0014] Preferably, the splicing structure includes a pointed cone fixedly connected to the bottom end of the partition, and clamping strips are fixedly connected to both sides of the partition.

[0015] Preferably, the opposite surfaces of the two clamping strips are provided with polyethylene geotextiles, and the interiors of the two polyethylene geotextiles are filled with concrete fillers.

[0016] Due to the adoption of the above technical solution, the present invention has the following technical advancements compared to the prior art: The present invention provides a combined support device suitable for deep and narrow foundation pits. Through the action of the width adjustment structure, the sliding frame slides according to the depth of the deep and narrow foundation pit, thereby driving the fixed block to adjust the overall width of the bottom of the width adjustment structure, so that the combined support device suitable for deep and narrow foundation pits can be adaptively adjusted according to the width of the bottom of the deep and narrow foundation pit, thereby improving the versatility and practical effect of the device, and can provide a stable support effect while reducing the space occupied by the device.

[0017] The present invention provides a combined support device suitable for deep and narrow foundation pits. Through the action of the support structure, a tool is used to rotate the torsion nut, thereby driving the synchronous belt transmission assembly to work. Under the limiting action of the top frame and the frame on the screw rod, the screw rod drives the top frame to slide up and down, thereby adjusting the position of the top frame, so that the bottom frame can be kept horizontal, ensuring that the support plate can be kept parallel to the partition, overcoming the influence of the flat environment at the bottom of the foundation pit on the installation of the width adjustment structure, and avoiding the slope between the bottom of the foundation pit and the underground continuous wall affecting the supporting effect of the support plate.

[0018] The present invention provides a combined support device suitable for deep and narrow foundation pits. Through the action of the splicing structure, the pointed cone can facilitate the insertion of the partition into the interior of the foundation pit, thereby improving the installation efficiency of the partition. The card strips between adjacent partitions are plugged into each other, thereby ensuring the assembly continuity of the partition. Concrete slurry is poured into the interior of two adjacent card strips, and the concrete slurry solidifies into a concrete filling body, which can then fix the two card strips, thereby achieving fixation between adjacent partitions and improving the sealing effect between the partitions to avoid sand leakage and water seepage. The polyethylene geotextile can avoid the adhesion between the concrete filling body and the card strip when the partition is removed after the construction is completed, thereby avoiding the problem of difficulty in disassembling the card strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the width adjustment structure of the present invention; Figure 3 It is a schematic diagram of the sliding frame structure of the present invention; Figure 4 is a schematic structural diagram of the support structure of the present invention; Figure 5 This is a schematic diagram of the pointed cone structure of the present invention; Figure 6 This is a schematic structural diagram of a concrete filling body according to the present invention; Figure 7 For the present invention Figure 3 A in the enlarged view.

[0020] In the figure: 1. partition; 2. column; 3. purlin; 4. width adjustment structure; 41. support plate; 42. base frame; 43. sliding frame; 44. fixing block; 45. fixing hole; 46. latch; 47. round hole; 48. fixing plate; 49. spring top rod; 410. wedge block; 411. operating block; 412. movable slot; 413. telescopic support rod; 414. side support rod; 5. supporting structure; 51. base; 52. frame; 53. screw rod; 54. top frame; 55. oblique notch; 56. roller; 57. torsion nut; 58. synchronous belt drive assembly; 59. limit plate; 510. fixing piece; 511. threaded hole; 6. splicing structure; 61. pointed cone; 62. card strip; 63. polyethylene geotextile; 64. concrete filling body. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Specific examples are given below.

[0023] See also Figure 1 - Figure 7 The present invention provides a technical solution: a combined support device suitable for deep and narrow foundation pits, including a partition 1, a plurality of columns 2 are fixedly installed on one side of the partition 1, a plurality of surrounding purlin beams 3 are fixedly installed on one side of the column 2, a width adjustment structure 4 is fixedly installed on one side of the surrounding purlin beam 3, a support structure 5 is fixedly installed on the bottom of the width adjustment structure 4, a splicing structure 6 is fixedly installed on one side of the partition 1, the width adjustment structure 4 includes a support plate 41 fixedly installed on one side of the surrounding purlin beam 3, the bottom end of the support plate 41 is fixedly connected to a base frame 42, and the end of the base frame 42 is provided with a The sliding rail has a sliding frame 43 that is slidably connected to the inside of the sliding rail. The end of the sliding frame 43 away from the base frame 42 is fixedly connected to a fixed block 44. The top of the fixed block 44 is rotatably connected to a telescopic support rod 413. The top of the base frame 42 is fixedly connected to a side support rod 414. The sliding frame 43 slides according to the depth of the deep and narrow foundation pit, thereby driving the fixed block 44 to adjust the overall width of the bottom of the width adjustment structure 4, so that the combined support device suitable for deep and narrow foundation pits can be adaptively adjusted according to the width of the bottom of the deep and narrow foundation pit, thereby improving the versatility and practical effect of the device.

[0024] like Figure 2 and Figure 3As shown, one side of the sliding frame 43 is provided with a plurality of fixing holes 45 that pass through the sliding frame 43, and the side of the base frame 42 is provided with two insertion holes overlapping with the fixing holes 45. The inside of the insertion holes is connected with the pins 46 that pass through the fixing holes 45. After the fixing block 44 is adjusted to a suitable position, the insertion holes of the base frame 42 are aligned with the corresponding fixing holes 45, and the pins 46 are inserted. The pins 46 can fix the sliding frame 43 and the base frame 42, thereby ensuring the stability of the entire device.

[0025] like Figure 7 As shown, a fixing plate 48 is fixedly connected to one side of the base frame 42, a spring push rod 49 is fixedly connected to one side of the fixing plate 48, a wedge block 410 is fixedly connected to the output end of the spring push rod 49, a circular hole 47 is opened at the end of the latch 46, the size and shape of the inner wall of the circular hole 47 are adapted to the size and shape of the outer wall of the wedge block 410, an operating block 411 is fixedly connected to the outer wall of the wedge block 410, and a movable groove 412 is opened on the inner wall of the circular hole 47 to pass through one end of the latch 46, the inner wall of the movable groove 412 is plugged into the outer wall of the operating block 411, and during the insertion process of the latch 46, the end of the latch 46 squeezes the wedge block 410, thereby causing the wedge block 410 to squeeze the spring push rod 49. When the wedge block 410 is aligned with the circular hole 47, the wedge block 410 is inserted into the circular hole 47 under the action of the spring push rod 49, thereby performing a secondary fixation on the latch 46, thereby avoiding the problem of the latch 46 being loosened during the subsequent hoisting of the width adjustment structure 4 and the sliding of the width adjustment structure 4, thereby improving the stability of the device during assembly and improving the safety effect of the device. The operating block 411 can directly slide the wedge block 410, thereby facilitating the wedge block 410 to detach from the circular hole 47, thereby facilitating the disassembly of the latch 46.

[0026] like Figure 1 and Figure 2 As shown, the top of the telescopic support rod 413 is rotatably connected to one side of the support plate 41, the middle part of the telescopic support rod 413 is threadedly connected with a locking bolt, and the top of the side support rod 414 is fixedly connected to the bottom of one side of the support plate 41. After the fixing block 44 and the sliding frame 43 are fixed, the telescopic support rod 413 is fixed with the locking bolt. At this time, the telescopic support rod 413 can support the top of the support plate 41, and the side support rod 414 can support the bottom of the support plate 41. The cooperation between the two can provide a better and more stable support effect, improve the overall compressive resistance of the support plate 41, and avoid the problem of stress concentration.

[0027] like Figure 4As shown, the support structure 5 includes a base 51, the top of the base 51 is fixedly connected to a frame 52, the middle of the frame 52 is slidably connected to two screw rods 53, the tops of the two screw rods 53 are commonly fixedly connected to a top frame 54, and the bottom end of the fixed block 44 is installed with a roller 56. The outer wall of the roller 56 is slidably connected to the inside of the top frame 54. The width adjustment structure 4 is sent to the bottom of the foundation pit by hoisting, and then the roller 56 at the bottom of the fixed block 44 is inserted into the inside of the top frame 54. The other end of the base frame 42 is placed on the top of a surrounding purlin 3. At this time, the horizontal position of the width adjustment structure 4 can be fine-tuned by utilizing the sliding action of the roller 56 and the inside of the top. With the combination of multiple width adjustment structures 4, a more comprehensive and uniform support effect can be provided for deep and narrow foundation pits.

[0028] like Figure 4 As shown, an oblique slot 55 is provided at the top of the top frame 54, and the width of the top of the oblique slot 55 is much larger than the width of the roller 56. During the hoisting process, the pressure between the oblique slot 55 and the roller 56 can assist the roller 56 in positioning and sliding into the interior of the top frame 54, thereby improving the accuracy of the structural hoisting and reducing the difficulty and efficiency of the hoisting.

[0029] like Figure 1 and Figure 3 As shown, a fixing piece 510 is fixedly connected to one side of the fixing block 44, and a plurality of threaded holes 511 are provided on the side of the top frame 54 away from the partition 1. The fixing piece 510 and the threaded holes 511 are fixedly connected by bolts. The fixing piece 510 is fixed to the top frame 54 by means of bolts, and then the support plate 41 is fixed, thereby further improving the stability of the device.

[0030] like Figure 4 As shown, the top of the frame 52 is rotatably connected with a torsion nut 57, the inner wall of the torsion nut 57 is threadedly connected to the outer wall of a screw rod 53, and the bottom end of the torsion nut 57 is installed with a synchronous belt transmission assembly 58, the middle part of the synchronous belt transmission assembly 58 is threadedly connected to the outer walls of the two screw rods 53, and the bottom ends of the two screw rods 53 are fixedly connected to the limiting disk 59. The torsion nut 57 can be rotated by a tool to drive the synchronous belt transmission assembly 58 to work. Under the limiting action of the top frame 54 and the frame 52 on the screw rod 53, the screw rod 53 drives the top frame 54 to slide up and down, thereby adjusting the position of the top frame 54, so that the base frame 42 can remain horizontal, ensuring that the support plate 41 can remain parallel to the partition 1, overcoming the influence of the flat environment at the bottom of the foundation pit on the installation of the width adjustment structure 4, and avoiding the slope between the bottom of the foundation pit and the underground continuous wall affecting the supporting effect of the support plate 41.

[0031] It should be noted that the synchronous belt transmission assembly 58 is composed of a toothed synchronous belt and two toothed transmission wheels meshing with the synchronous belt.

[0032] like Figure 5 As shown, the splicing structure 6 includes a pointed cone 61 fixedly connected to the bottom end of the partition 1, and a clamping strip 62 is fixedly connected on both sides of the partition 1. The pointed cone 61 can facilitate the insertion of the partition 1 into the foundation pit, thereby improving the installation efficiency of the partition. The clamping strips 62 between adjacent partitions 1 are plugged into each other, thereby ensuring the assembly continuity of the partition 1.

[0033] like Figure 6 As shown, polyethylene geotextiles 63 are provided on the opposite sides of the two clamping strips 62, and the interior of the two polyethylene geotextiles 63 is filled with concrete filling bodies 64. Concrete slurry is poured into the interior of the two adjacent clamping strips 62, and the concrete slurry solidifies into concrete filling bodies 64, which can then fix the two clamping strips 62, thereby achieving fixation between adjacent partitions 1, and at the same time improving the sealing effect between partitions 1 and partitions 1 to avoid sand leakage and water seepage. The polyethylene geotextile 63 can avoid adhesion between the concrete filling body 64 and the clamping strip 62 when the partition 1 is removed after the construction is completed, thereby preventing the clamping strip 62 from being difficult to disassemble and assemble.

[0034] The working principle of the present invention is as follows: when in use, the partitions 1 are installed one by one on one side of the underground continuous wall by hoisting. During the hoisting process, the clips 62 between adjacent partitions 1 are plugged into each other, thereby ensuring the assembly continuity of the partitions 1. Then, concrete slurry is poured into the interiors of two adjacent clips 62. The concrete slurry solidifies into a concrete filling body 64, which can then fix the two clips 62, thereby achieving fixation between adjacent partitions 1. At the same time, the sealing effect between the partitions 1 and 1 can be improved to avoid sand leakage and water seepage. The polyethylene geotextile 63 can avoid the adhesion between the concrete filling body 64 and the clips 62 when the partition 1 is removed after the construction is completed, thereby preventing the clips 62 from being difficult to disassemble and install. Then, the columns 2 and the surrounding purlin beams 3 are installed on the partition 1 in sequence. The sliding frame 43 is slid according to the depth of the deep and narrow foundation pit, thereby driving the fixed block 44 to adjust the overall width of the bottom of the width adjustment structure 4, so that the combined support device suitable for deep and narrow foundation pits can be adaptively adjusted according to the width of the bottom of the deep and narrow foundation pit, thereby improving the versatility and practical effect of the device. After the fixed block 44 is adjusted to the appropriate position, the socket of the base frame 42 is aligned with the corresponding fixing hole 45, and the latch 46 is inserted. The latch 46 can fix the sliding frame 43 to the base frame 42, thereby ensuring the stability of the entire device. During the insertion process of the latch 46, the end of the latch 46 squeezes the wedge block 410, which can cause the wedge block 410 to squeeze the spring top rod 49. When the wedge block 410 is aligned with the circular hole 47 The wedge block 410 is inserted into the circular hole 47 under the action of the spring top rod 49, and then the latch 46 can be fixed for a second time, so as to avoid the problem of the latch 46 being loose when the width adjustment structure 4 is subsequently hoisted and the width adjustment structure 4 is slid, thereby improving the stability of the device during assembly and improving the safety effect of the device. After the fixing block 44 and the sliding frame 43 are fixed, the telescopic support rod 413 is fixed with a locking bolt. At this time, the telescopic support rod 413 can support the top of the support plate 41, and the side support rod 414 can support the bottom of the support plate 41. The cooperation between the two can provide a better and more stable support effect, improve the overall compressive resistance of the support plate 41, and avoid the problem of stress concentration. Afterwards, the width adjustment structure 4 is sent to the bottom of the foundation pit through hoisting, and then the roller 56 at the bottom of the fixed block 44 is inserted into the interior of the top frame 54, and the other end of the base frame 42 is placed on the top of a surrounding purlin beam 3. At this time, the horizontal position of the width adjustment structure 4 can be fine-tuned by utilizing the sliding effect of the roller 56 and the top interior. With multiple width adjustment structures 4, a more comprehensive and uniform support effect can be provided for deep and narrow foundation pits. During the hoisting process, the pressure between the inclined notch 55 and the roller 56 can assist the roller 56 in positioning and sliding into the interior of the top frame 54, thereby improving the accuracy of the structure hoisting and reducing the difficulty and efficiency of hoisting. After the width adjustment structure 4 is slid to the appropriate position, it can be used Bolts are used to fix the fixing parts 510 and the top frame 54, thereby fixing the support plate 41, thereby further improving the stability of the device. Before hoisting the width adjustment structure 4, a tool can be used to rotate the torsion nut 57, thereby driving the synchronous belt drive assembly 58 to work. Under the limiting effect of the top frame 54 and the frame 52 on the screw rod 53, the screw rod 53 drives the top frame 54 to slide up and down, thereby adjusting the position of the top frame 54, thereby allowing the base frame 42 to remain horizontal, ensuring that the support plate 41 can remain parallel to the partition 1, overcoming the influence of the flat environment at the bottom of the foundation pit on the installation of the width adjustment structure 4, and avoiding the slope between the bottom of the foundation pit and the underground continuous wall affecting the support effect of the support plate 41.

[0035] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined support device suitable for deep and narrow foundation pits, comprising a partition (1), characterized in that: A plurality of columns (2) are fixedly installed on one side of the partition (1), a plurality of purlin beams (3) are fixedly installed on one side of the columns (2), a width adjustment structure (4) is fixedly installed on one side of the purlin beam (3), a support structure (5) is fixedly installed at the bottom of the width adjustment structure (4), a splicing structure (6) is fixedly installed on one side of the partition (1), the width adjustment structure (4) comprises a support plate (41) fixedly installed on one side of the purlin beam (3), the bottom end of the support plate (41) is fixedly connected to a base frame (42), a slide rail is provided at the end of the base frame (42), a sliding frame (43) is slidably connected inside the slide rail, an end of the sliding frame (43) away from the base frame (42) is fixedly connected to a fixed block (44), the top of the fixed block (44) is rotatably connected to a telescopic support rod (413), and the top of the base frame (42) is fixedly connected to a side support rod (414).

2. The combined support device suitable for deep and narrow foundation pits according to claim 1, characterized in that: A plurality of fixing holes (45) penetrating the sliding frame (43) are provided on one side of the sliding frame (43), and two insertion holes overlapping with the fixing holes (45) are provided on the side of the base frame (42), wherein pins (46) penetrating the fixing holes (45) are inserted into the insertion holes.

3. The combined support device suitable for deep and narrow foundation pits according to claim 2, characterized in that: A fixing plate (48) is fixedly connected to one side of the base frame (42), a spring push rod (49) is fixedly connected to one side of the fixing plate (48), an output end of the spring push rod (49) is fixedly connected to a wedge block (410), a circular hole (47) is provided at the end of the latch (46), the size and shape of the inner wall of the circular hole (47) are adapted to the size and shape of the outer wall of the wedge block (410), an operating block (411) is fixedly connected to the outer wall of the wedge block (410), a movable groove (412) is provided on the inner wall of the circular hole (47) and passes through one end of the latch (46), and the inner wall of the movable groove (412) is plugged into the outer wall of the operating block (411).

4. The combined support device suitable for deep and narrow foundation pits according to claim 1, characterized in that: The top end of the telescopic support rod (413) is rotatably connected to one side of the support plate (41), a locking bolt is threadedly connected to the middle portion of the telescopic support rod (413), and the top end of the side support rod (414) is fixedly connected to the bottom end of one side of the support plate (41).

5. The combined support device suitable for deep and narrow foundation pits according to claim 1, characterized in that: The support structure (5) comprises a base (51), the top end of the base (51) is fixedly connected to a frame (52), the middle part of the frame (52) is slidably connected to two screw rods (53), the top ends of the two screw rods (53) are commonly fixedly connected to a top frame (54), and the bottom end of the fixed block (44) is equipped with a roller (56), the outer wall of the roller (56) is slidably connected to the inside of the top frame (54).

6. The combined support device suitable for deep and narrow foundation pits according to claim 5, characterized in that: An oblique notch (55) is provided at the top of the top frame (54), and the width of the top of the oblique notch (55) is much greater than the width of the roller (56).

7. The combined support device suitable for deep and narrow foundation pits according to claim 5, characterized in that: A fixing piece (510) is fixedly connected to one side of the fixing block (44), and a plurality of threaded holes (511) are provided on a side of the top frame (54) away from the partition (1). The fixing piece (510) and the threaded holes (511) are fixedly connected via bolts.

8. The combined support device suitable for deep and narrow foundation pits according to claim 5, characterized in that: The top of the frame (52) is rotatably connected to a torsion nut (57), the inner wall of the torsion nut (57) is threadedly connected to the outer wall of a screw rod (53), the bottom end of the torsion nut (57) is installed with a synchronous belt transmission assembly (58), the middle part of the synchronous belt transmission assembly (58) is threadedly connected to the outer walls of two screw rods (53), and the bottom ends of the two screw rods (53) are fixedly connected to a limit plate (59).

9. The combined support device suitable for deep and narrow foundation pits according to claim 1, characterized in that: The splicing structure (6) comprises a pointed cone (61) fixedly connected to the bottom end of the partition (1), and clamping strips (62) are fixedly connected to both sides of the partition (1).

10. The combined support device suitable for deep and narrow foundation pits according to claim 9, characterized in that: The opposite surfaces of the two clamping strips (62) are both provided with polyethylene geotextiles (63), and the interiors of the two polyethylene geotextiles (63) are filled with concrete filling bodies (64).

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