A protective structure for blasting construction of subway station foundation pit

Abstract

The present invention discloses a subway station foundation pit blasting construction protection structure, which relates to the field of subway station construction technology, and includes a base, wherein guide shafts are vertically provided at the four upper corners of the base, and limit plates are slidably provided between the outsides of each guide shaft, and concave frames are provided on both sides of the limit plates, and a storage shell is hinged between the two ends of the concave frame through a rotating assembly, and a dual-mode support is provided on one side of the storage shell, and a stone protection member is provided between the two storage shells. The subway station foundation pit blasting construction protection structure can adjust the position of the protection support point accordingly for different types of foundation pits, so that it can adapt to support work at positions of different heights, widths and angles, thereby improving the applicability of the protection structure. By providing point support members on the support plate, two modes of protection support work can be achieved, namely, surface support and point support.

Description

Technical Field

[0001] The invention relates to the technical field of subway station construction, in particular to a subway station foundation pit blasting construction protective structure. Background Art

[0002] A subway station is an important building in an urban rail transit network. It is the main place for passengers to board, disembark, transfer and wait for trains. The main construction methods for subway stations are the cover excavation method and the drill and blast method. The drill and blast method mainly involves excavating rocks by drilling, charging and blasting. When using the drill and blast method to excavate the subway station foundation pit, a protective structure must be set up first. The existence of the protective structure can effectively protect the side walls and support devices of the foundation pit, making them less likely to be damaged by blasting.

[0003] The utility model disclosed in Chinese Patent Publication No. CN213391302U discloses a protective structure for blasting construction of subway station foundation pits, which relates to the field of blasting construction. The protective structure for blasting construction of subway station foundation pits includes a base, a support plate fixedly connected to the top of the base, two sets of elastic members fixedly connected to the front of the support plate, a cross plate fixedly connected to the front of the two sets of elastic members, a connecting block fixedly connected to the front of the cross plate at both ends of the front, a first protective net fixedly connected to the front of the two sets of connecting blocks, a second protective net provided at the front of the first protective net, and a fixed rod fixedly connected to the surface of the second protective net on the side close to the first protective net. The first and second protective nets of the protective structure for blasting construction of subway station foundation pits can buffer flying rocks multiple times, reducing damage to the second protective net caused by the rigid collision of flying rocks with the second protective net. When the pin is knocked into the ground, the fixed block can support the support plate and is stable and firm and not easy to move.

[0004] However, the protective device can only provide protective support for a single position and cannot adjust the protective support point for different types of foundation pits, thereby reducing the applicability of the protective device. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a subway station foundation pit blasting construction protection structure, which solves the problem that traditional protection devices can only provide protection support for a single position and cannot adjust the protection support points for different types of foundation pits.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a subway station foundation pit blasting construction protection structure, including a base, wherein guide shafts are vertically arranged at the four upper corners of the base, and limit plates are slidably arranged between the outsides of each guide shaft, and concave frames are provided on both sides of the limit plates. A storage shell is hinged between the two ends of the concave frame through a rotating assembly, a dual-mode support is provided on one side of the storage shell, and a stone guard is provided between the two storage shells.

[0007] A driving part is provided at the bottom of the base, and a first screw is rotatably provided on the upper front and rear sides of the base. A threaded sleeve adapted to the first screw is provided on the lower front and rear sides of the limit plate, and the two threaded sleeves are respectively screwed to the outside of the two first screws.

[0008] The interior of the limiting plate is a hollow structure, and a second screw is rotatably provided inside the limiting plate, and a second handle is rotatably provided on the front side of the limiting plate, the second handle is connected to the second screw, and the outside of the second screw is screwed with a first nut sleeve that matches it, and both sides of the first nut sleeve are hinged with a first adjusting shaft, the concave frame slides through one side of the limiting plate, and the other end of the first adjusting shaft is hinged to one side of the concave frame.

[0009] As a further technical solution of the present invention, the driving member includes two transmission wheels rotatably connected to the lower front and rear sides of the base, the two transmission wheels are respectively connected to the two first screws, and the two transmission wheels are connected by belt transmission, and a first handle is provided at the lower part of the transmission wheel.

[0010] As a further technical solution of the present invention, a crossbeam is provided between the two ends of the concave frame, a third handle is rotatably provided on the upper part of the crossbeam, a third screw is connected to the lower end of the third handle, a second adjustment shaft adapted to the third screw is screwed to the outside of the third screw, and the other end of the second adjustment shaft is hinged to the lower side of the dual-mode support member.

[0011] As a further technical solution of the present invention, the rotating assembly includes a movable block and a groove arranged at one end of the concave frame, the movable block is hinged inside the groove, and one end of the movable block is connected to the storage shell.

[0012] As a further technical solution of the present invention, the dual-mode support member includes an arc-shaped support plate, a strip groove is provided in the middle position of the arc surface of the support plate, a number of point supports are hinged inside the strip groove, and the same number of positioning holes as the point supports are provided inside the strip groove.

[0013] As a further technical solution of the present invention, the point support member includes a supporting bar block rotatably arranged inside the strip groove, the interior of the supporting bar block is a hollow structure, and a supporting ball is provided at one end of the supporting bar block, and a positioning shaft is provided on one side of the supporting ball. The positioning shaft slides through the interior of the supporting bar block, and a stop block is provided on the outside of the positioning shaft. A return spring is provided on the outside of the positioning shaft, and the two ends of the return spring are respectively connected to the inner side of the support bar block and one side of the stop block. When the support bar block is perpendicular to the support plate, one end of the positioning shaft is just inserted into the positioning hole inside the strip groove.

[0014] As a further technical solution of the present invention, the storage shell includes a shell arranged on the inner side of the dual-mode support member, a storage roller is rotatably provided inside the shell, and a storage groove is provided on the upper part of the shell, a fourth handle is rotatably provided at one end of the shell, the fourth handle is connected to the storage roller, a gear is provided on the outside of one end of the storage roller, and a positioning bolt corresponding to the gear is screwed into the upper part of one end of the shell through a thread.

[0015] As a further technical solution of the present invention, the stone prevention part includes two limit seats respectively arranged on the inner side above the two dual-mode support parts, a guide roller is rotatably arranged between the two limit seats, and a stone-catching cloth is slidably arranged between the two guide rollers. The stone-catching cloth is respectively wound on the storage rollers inside the two shells, and the first clockwork spring sheet and the second clockwork spring sheet are symmetrically arranged at the two upper edges of the stone-catching cloth.

[0016] Beneficial effects

[0017] The present invention provides a subway station foundation pit blasting construction protection structure, which has the following beneficial effects compared with the existing technology:

[0018] 1. The subway station foundation pit blasting construction protection structure can adjust the position of the protection support point accordingly for different types of foundation pits, so that it can adapt to support work at positions of different heights, widths and angles, and is easy to adjust, thereby improving the applicability of the protection structure.

[0019] 2. The subway station foundation pit blasting construction protection structure can realize two modes of protection support work, surface support and point support, by arranging point support members on the support plate. It is necessary to perform point support on the foundation pit template, and open each point support member inside the strip groove so that it is perpendicular to the support plate. Before opening, pull the support ball, and the support ball drives the positioning shaft to move so that one end of the positioning shaft moves into the support strip block, and then rotate the support strip block to a position perpendicular to the support plate. After that, release the support ball, and the reset spring will reset the positioning shaft so that one end of the positioning shaft is inserted into the corresponding positioning hole inside the strip groove to fix the support strip block, and then move the support plate toward the position of the template. In this way, each support strip block will support the template for point support. When point support is not needed, the support strip block can be stored in the strip groove on the support plate. It is convenient and fast, and the two modes can be used separately without interfering with each other.

[0020] 3. The subway station foundation pit blasting construction protection structure is provided with stone-proof parts. When the two dual-mode support members move, the stone-jointing cloth will be stretched out. After being stretched out, the positioning bolts are turned to make it jam into the gear, fix the storage roller, and then fix the stone-jointing cloth. During blasting, falling rocks will fall onto the stone-jointing cloth to play a protective role. The tension of the stone-jointing cloth is adjusted by turning the fourth handle. After adjustment, the gear is fixed with the positioning bolt to adjust the protective effect of the stone-jointing cloth. After the blasting is completed, the positioning bolts are loosened. As the two dual-mode support members move toward the middle, the first spring sheet 74 and the second spring sheet on the stone-jointing cloth have the function of automatic winding, so the stone-jointing cloth will be automatically wound to the two storage rollers inside the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation of the stone protection structure of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the limiting plate of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the base of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the dual-mode support member of the present invention in a first working state;

[0026] Figure 6 This is a schematic structural diagram of the dual-mode support member of the present invention in the second working state;

[0027] Figure 7 This is a schematic structural diagram of a point support member of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the storage shell of the present invention.

[0029] In the figure: 1. Base; 11. First screw; 12. Drive wheel; 13. Belt; 14. First handle; 2. Guide shaft; 3. Limit plate; 31. Second handle; 32. Second screw; 33. First nut sleeve; 34. First adjustment shaft; 35. Crossbeam; 36. Third handle; 37. Third screw; 38. Second nut sleeve; 39. Second adjustment shaft; 310. Threaded sleeve; 4. Concave frame; 41. Groove; 42. Movable block; 5. Storage shell; 51. Housing ; 52. Storage roller; 53. Storage slot; 54. Fourth handle; 55. Gear; 56. Positioning bolt; 6. Dual-mode support; 61. Support plate; 62. Strip groove; 63. Point support; 631. Support bar; 632. Support ball; 633. Positioning shaft; 634. Stop block; 635. Reset spring; 64. Positioning hole; 7. Stone guard; 71. Limit seat; 72. Guide roller; 73. Stone-catching cloth; 74. First spring leaf; 75. Second spring leaf. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1-8 , the present invention provides four technical solutions:

[0032] Example 1

[0033] See also Figure 1 In an embodiment of the present invention, a protective structure for blasting construction of a subway station foundation pit includes a base 1. Guide shafts 2 are vertically arranged at the four corners of the upper part of the base 1. Limit plates 3 are slidably arranged between the outsides of each guide shaft 2. Concave frames 4 are arranged on both sides of the limit plates 3. A storage shell 5 is hinged between the two ends of the concave frame 4 through a rotating assembly. A dual-mode support member 6 is arranged on one side of the storage shell 5, and a stone prevention member 7 is arranged between the two storage shells 5.

[0034] See also Figure 4In the embodiment of the present invention, a driving member is provided at the bottom of the base 1, and a first screw 11 is rotatably provided on the upper front and rear sides of the base 1, and a threaded sleeve 310 is provided on the lower front and rear sides of the limiting plate 3 to match the first screw 11. The two threaded sleeves 310 are respectively screwed to the outside of the two first screws 11, and the driving member includes two transmission wheels 12 rotatably connected to the lower front and rear sides of the base 1. The two transmission wheels 12 are respectively connected to the two first screws 11, and the two transmission wheels 12 are connected through a belt 13. The lower part of the transmission wheel 12 is provided with a A first handle 14 is provided to move the protective device to the position that needs protection in the foundation pit. After adjustment, the first handle 14 is turned to drive the transmission wheel 12 to rotate, and the transmission wheel 12 causes the belt 13 to drive another transmission wheel 12 to rotate. The two transmission wheels 12 respectively drive the two first screws 11 to rotate, and the two first screws 11 will respectively drive the two threaded sleeves 310 at the bottom of the limit plate 3 to move, and then drive the limit plate 3 to slide in the guide shaft 2 on the base 1, and adjust the height of the limit plate 3 to facilitate the protective support work of the foundation pit formwork at different heights.

[0035] See also Figure 3 When the cam 31 is unlocked, the second handle 31 is unlocked, and the second handle 31 is unlocked to unlock the cam 31. The second handle 31 is connected to the second screw 32, and the outside of the second screw 32 is screwed with a first nut sleeve 33 that matches it. Both sides of the first nut sleeve 33 are hinged with a first adjusting shaft 34, and the concave frame 4 slides through one side of the limiting plate 3, and the other end of the first adjusting shaft 34 is hinged to one side of the concave frame 4. Rotating the second handle 31 drives the second screw 32 to rotate, and the second screw 32 drives the first nut sleeve 33 to move. The first adjusting shaft 34 on the first nut sleeve 33 will drive the concave frame 4 to move, and the concave frame 4 will drive the dual-mode support member 6 to move, so that the support plate 61 can support the template in the foundation pit.

[0036] The second embodiment differs from the first embodiment in that:

[0037] See also Figure 3In this embodiment of the present invention, a crossbeam 35 is provided between the two ends of the concave frame 4, and a third handle 36 is rotatably provided on the upper part of the crossbeam 35. The lower end of the third handle 36 is connected to a third screw 37. The outside of the third screw 37 is screwed with a second adjusting shaft 39 adapted thereto. The other end of the second adjusting shaft 39 is hinged to the lower side of the dual-mode support 6. The rotating assembly includes a movable block 42 and a groove 41 provided at one end of the concave frame 4. The movable block 42 is hinged to the inside of the groove 41, and one end of the movable block 42 is connected to the storage shell 5. Rotating the third handle 36 drives the third screw 37 to rotate, and the third screw 37 drives the second nut sleeve 38 to move up and down. The second adjusting shaft 39 on the second nut sleeve 38 will drive the dual-mode support 6 to rotate, adjust the angle of the dual-mode support 6, and facilitate adjustment of the support angle of the foundation pit template.

[0038] The third embodiment differs from the first and second embodiments in that:

[0039] See also Figure 5 In an embodiment of the present invention, the dual-mode support member 6 includes an arc-shaped support plate 61, a strip groove 62 is provided at the middle position of the arc surface of the support plate 61, a plurality of point support members 63 are hinged inside the strip groove 62, and the strip groove 62 is provided with positioning holes 64 with the same number as the point support members 63.

[0040] See also Figure 6-7In the embodiment of the present invention, the point support member 63 includes a support bar 631 rotatably arranged inside the strip groove 62. The interior of the support bar 631 is a hollow structure, and one end of the support bar 631 is provided with a supporting ball 632, and one side of the supporting ball 632 is provided with a positioning shaft 633. The positioning shaft 633 slides through the interior of the support bar 631, and a stopper 634 is provided on the outside of the positioning shaft 633. A return spring 635 is sleeved on the outside of the positioning shaft 633, and the two ends of the return spring 635 are respectively connected to the inner side of the support bar 631 and one side of the stopper 634. When the support bar 631 is perpendicular to the support plate 61, one end of the positioning shaft 633 is just inserted into the positioning hole 64 inside the strip groove 62. When the foundation pit template needs to be point-supported, the interior of the strip groove 62 is When the support plate 61 is moved toward the position of the template, each support bar 631 will support the template and provide point support. When point support is not needed, the support bar 631 will be stored in the strip groove 62 on the support plate 61.

[0041] The fourth embodiment differs from the first, second and third embodiments in that:

[0042] See also Figure 8 In the embodiment of the present invention, the storage shell 5 includes a shell 51 arranged on the inner side of the dual-mode support member 6, and a storage roller 52 is rotatably provided inside the shell 51, and a storage groove 53 is provided on the upper part of the shell 51. A fourth handle 54 is rotatably provided at one end of the shell 51, and the fourth handle 54 is connected to the storage roller 52. A gear 55 is provided on the outside of one end of the storage roller 52. A positioning bolt 56 corresponding to the gear 55 is screwed into the upper part of one end of the shell 51 through a thread. The tension of the stone-jointing cloth 73 is adjusted by rotating the fourth handle 54. After adjustment, the gear 55 is fixed with the positioning bolt 56 to adjust the protective effect of the stone-jointing cloth 73.

[0043] See also Figure 2In the embodiment of the present invention, the stone guard 7 includes two limit seats 71 respectively arranged on the inner side above the two dual-mode support members 6, a guide roller 72 is rotatably arranged between the two limit seats 71, and a stone-catching cloth 73 is slidably arranged between the two guide rollers 72. The stone-catching cloth 73 is respectively wound on the receiving rollers 52 inside the two shells 51, and the first spring piece 74 and the second spring piece 75 are symmetrically arranged at the two upper edges of the stone-catching cloth 73. When the two dual-mode support members 6 move, the stone-catching cloth 73 will be pulled out. After pulling out, the positioning bolt 56 is rotated to make it stuck in the gear 55, thereby fixing the receiving roller 52 and then fixing the stone-catching cloth 73. During blasting, falling rocks will fall onto the stone-catching cloth 73, playing a protective role.

[0044] Working principle: Move the protective device to the position that needs to be protected in the foundation pit. After adjustment, turn the first handle 14 to drive the transmission wheel 12 to rotate. The transmission wheel 12 causes the belt 13 to drive the other transmission wheel 12 to rotate. The two transmission wheels 12 respectively drive the two first screws 11 to rotate. The two first screws 11 will respectively drive the two threaded sleeves 310 at the bottom of the limit plate 3 to move, thereby driving the limit plate 3 to slide in the guide shaft 2 on the base 1 to adjust the height of the limit plate 3;

[0045] After the height of the limit plate 3 is adjusted, the third handle 36 is turned to drive the third screw 37 to rotate, and the third screw 37 drives the second nut sleeve 38 to move up and down, and the second adjusting shaft 39 on the second nut sleeve 38 will drive the dual-mode support member 6 to rotate to adjust the angle of the dual-mode support member 6. After the adjustment, the second handle 31 is turned to drive the second screw 32 to rotate, and the second screw 32 drives the first nut sleeve 33 to move, and the first adjusting shaft 34 on the first nut sleeve 33 will drive the concave frame 4 to move, and the concave frame 4 will drive the dual-mode support member 6 to move, so that the support plate 61 supports the template in the foundation pit to perform surface support protection work;

[0046] When point support of the foundation pit template is required, each point support member 63 inside the strip groove 62 is opened so that it is perpendicular to the support plate 61. Before opening, the support ball 632 is pulled, and the support ball 632 drives the positioning shaft 633 to move, so that one end of the positioning shaft 633 moves into the support bar block 631, and then the support bar block 631 is rotated to make it rotate to a position perpendicular to the support plate 61. After that, the support ball 632 is released, and the return spring 635 will reset the positioning shaft 633, so that one end of the positioning shaft 633 is inserted into the corresponding positioning hole 64 inside the strip groove 62, fixing the support bar block 631, and then the support plate 61 is moved toward the position of the template. In this way, each support bar block 631 will support the template for point support. When point support is no longer needed, the support bar block 631 is stored in the strip groove 62 on the support plate 61. Figure 5 As shown;

[0047] When the two dual-mode support members 6 move, the stone-catching cloth 73 will be stretched out. After being stretched out, the positioning bolt 56 is turned to make it engage with the gear 55, thereby fixing the receiving roller 52 and thus fixing the stone-catching cloth 73. During blasting, falling rocks will fall onto the stone-catching cloth 73, playing a protective role. The tension of the stone-catching cloth 73 can be adjusted by turning the fourth handle 54. After adjustment, the positioning bolt 56 is used to fix the gear 55 to adjust the protective effect of the stone-catching cloth 73.

[0048] After the blasting is completed, the positioning bolt 56 is loosened. As the two dual-mode support members 6 move toward the middle, the first spring piece 74 and the second spring piece 75 on the stone-jointing cloth 73 have the function of automatic winding, so the stone-jointing cloth 73 will be automatically wound onto the storage rollers 52 inside the two shells 51.

[0049] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A subway station foundation pit blasting construction protection structure, comprising a base (1), characterized in that: Guide shafts (2) are vertically arranged at the four corners of the upper part of the base (1), and limiting plates (3) are slidably arranged between the outsides of each guide shaft (2), and concave frames (4) are arranged on both sides of the limiting plates (3). A storage shell (5) is hinged between the two ends of the concave frame (4) through a rotating assembly, and a dual-mode support member (6) is arranged on one side of the storage shell (5), and a stone prevention member (7) is arranged between the two storage shells (5); a driving member is arranged at the bottom of the base (1), and a first screw (11) is rotatably arranged on the upper front and rear sides of the base (1), and a threaded sleeve adapted to the first screw (11) is arranged on the lower front and rear sides of the limiting plates (3). (310), two threaded sleeves (310) are respectively screwed to the outside of the two first screw rods (11); the interior of the limiting plate (3) is a hollow structure, and the interior of the limiting plate (3) is rotatably provided with a second screw rod (32), and the front side of the limiting plate (3) is rotatably provided with a second handle (31), the second handle (31) is connected to the second screw rod (32), the exterior of the second screw rod (32) is screwed with a first nut sleeve (33) adapted thereto, and both sides of the first nut sleeve (33) are hinged with a first adjustment shaft (34), the concave frame (4) slides through one side of the limiting plate (3), and the other end of the first adjustment shaft (34) is hinged to one side of the concave frame (4); A crossbeam (35) is provided between the two ends of the concave frame (4); a third handle (36) is rotatably provided on the upper portion of the crossbeam (35); a third screw (37) is connected to the lower end of the third handle (36); a second adjustment shaft (39) adapted thereto is screwed to the outer portion of the third screw (37); the other end of the second adjustment shaft (39) is hinged to the lower side of the dual-mode support member (6); The dual-mode support member (6) comprises an arc-shaped support plate (61), a strip groove (62) is provided at the middle position of the arc surface of the support plate (61), a plurality of point support members (63) are hingedly connected inside the strip groove (62), and the same number of positioning holes (64) as the number of the point support members (63) are provided inside the strip groove (62); The point support member (63) includes a support bar (631) rotatably arranged inside the strip groove (62), the interior of the support bar (631) is a hollow structure, and a support ball (632) is provided at one end of the support bar (631), a positioning shaft (633) is provided on one side of the support ball (632), the positioning shaft (633) slides through the interior of the support bar (631), and a stopper (634) is provided on the outside of the positioning shaft (633), and a return spring (635) is sleeved on the outside of the positioning shaft (633), and the two ends of the return spring (635) are respectively connected to the inner side of the support bar (631) and one side of the stopper (634), and when the support bar (631) is perpendicular to the support plate (61), one end of the positioning shaft (633) is just inserted into the positioning hole (64) inside the strip groove (62).

2. The subway station foundation pit blasting construction protective structure according to claim 1, characterized in that: The driving member comprises two transmission wheels (12) rotatably connected to the lower front and rear sides of the base (1), the two transmission wheels (12) being connected to the two first screw rods (11) respectively, and the two transmission wheels (12) being connected to each other via a belt (13), and a first handle (14) being provided at the lower portion of the transmission wheel (12).

3. The subway station foundation pit blasting construction protective structure according to claim 1, characterized in that: The rotating assembly comprises a movable block (42) and a groove (41) provided at one end of the concave frame (4); the movable block (42) is hinged inside the groove (41), and one end of the movable block (42) is connected to the storage shell (5).

4. The subway station foundation pit blasting construction protective structure according to claim 1, characterized in that: The storage shell (5) includes a shell (51) arranged on the inner side of the dual-mode support member (6), a storage roller (52) is rotatably provided inside the shell (51), and a storage groove (53) is provided on the upper part of the shell (51), a fourth handle (54) is rotatably provided on one end of the shell (51), and the fourth handle (54) is connected to the storage roller (52), a gear (55) is provided on the outside of one end of the storage roller (52), and a positioning bolt (56) corresponding to the gear (55) is screwed into the upper part of one end of the shell (51) through a thread.

5. The subway station foundation pit blasting construction protective structure according to claim 4, characterized in that: The stone prevention member (7) comprises two limiting seats (71) respectively arranged on the inner sides above the two dual-mode support members (6); a guide roller (72) is rotatably arranged between the two limiting seats (71); a stone-catching cloth (73) is slidably arranged between the two guide rollers (72); the stone-catching cloth (73) is respectively wound on the receiving rollers (52) inside the two shells (51); and a first spring leaf (74) and a second spring leaf (75) are symmetrically arranged at the two upper edges of the stone-catching cloth (73).

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