CN218177251U - Upper step supporting device for tunnel three-step excavation method - Google Patents
Upper step supporting device for tunnel three-step excavation method Download PDFInfo
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- CN218177251U CN218177251U CN202222008466.9U CN202222008466U CN218177251U CN 218177251 U CN218177251 U CN 218177251U CN 202222008466 U CN202222008466 U CN 202222008466U CN 218177251 U CN218177251 U CN 218177251U
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Abstract
The utility model belongs to the technical field of tunnel construction, especially, three step excavation methods in tunnel go up step strutting arrangement, including vertical carriage, the internal surface both sides of vertical carriage fixed mounting respectively has the spacer bar. According to the supporting device for the upper step of the three-step excavation method of the tunnel, by arranging the telescopic mechanism, according to the excavation condition in the tunnel, the corresponding left swing frame or right swing frame on the longitudinal supporting frame is opened to support the face, the U-shaped seat is turned out from the fixed rod according to the distance between the left swing frame and the face and the distance between the right swing frame and the advance support on the face, the movable frame is pulled out to enable the end, provided with the fixed screw rod, of the movable frame to be in contact with the end after the advance, then the movable frame and the U-shaped seat are fixed through the insertion of the limit pin shaft and the first limit groove and the second limit groove, the second nut is unscrewed, the fixed screw rod is rotated to fix one end of the fixed screw rod with the advance support, then the second nut is screwed to fix the fixed screw rod, and the effect of supporting the face is achieved.
Description
Technical Field
The utility model relates to a tunnel construction technical field especially relates to a three step excavation methods in tunnel upper step strutting arrangement.
Background
The tunnel underground excavation construction method mainly comprises a full-section excavation method, a step excavation method, a circular excavation reserved core soil method, a single-side wall pit guiding method, a double-side wall pit guiding method, a middle partition wall method, a crossed middle partition wall method, a middle tunnel method, a side tunnel method, a column tunnel method, a hole pile method and the like. The tunnel excavation construction method has many factors to be considered, including factors in various aspects such as geological conditions, tunnel span, construction period, safety, economy, surrounding environment conditions and the like, and the traditional excavation method cannot meet the construction conditions which are variable on site.
The three-step excavation method of the tunnel is a tunnel construction method which takes arc pilot tunnel excavation and core soil retention as a basic mode, divides into three steps, namely an upper step, a middle step and a lower step, excavates and supports of all parts are staggered longitudinally along the tunnel and pushed in parallel, and avoids unsafe factors caused by the need of dismantling temporary supports and stress conversion, such as a side wall pilot tunnel method, a middle partition wall method, a cross middle partition wall method and the like, thereby facilitating mechanical construction and being beneficial to construction process conversion.
However, the initial support in the existing three-step excavation method has poor self-stability in the excavation process, shallow buried depth and certain bias voltage, large longitudinal, transverse and vertical displacement exists in the excavation supporting process, the construction difficulty is increased, meanwhile, the initial support cannot be closed into a ring in time, large settlement and convergence deformation are easily caused, and the steel arch frame deforms or even collapses seriously, so that the construction progress is influenced.
SUMMERY OF THE UTILITY MODEL
Based on current technical problem, the utility model provides a three step excavation methods in tunnel upper step strutting arrangement.
The utility model provides a tunnel three-step excavation method upper step strutting arrangement, including vertical support frame, the internal surface both sides of vertical support frame are fixed with the spacer bar respectively, a side surface of vertical support frame is provided with auxiliary support mechanism, auxiliary support mechanism includes supporting legs and adjusting screw, drives the supporting legs through rotating adjusting screw and removes;
the left side and the right side of the longitudinal supporting frame are respectively hinged with a left swing frame and a right swing frame through hinge shafts, the surfaces of one sides of the left swing frame and the right swing frame are respectively fixedly provided with two fixing rods, one sides of the opposite surfaces of the two fixing rods are hinged with a U-shaped seat through hinge shafts, the inner wall of the U-shaped seat is provided with a telescopic mechanism, the telescopic mechanism comprises a moving frame, and the outer surface of the moving frame is in sliding clamping connection with the inner wall of the U-shaped seat;
the top of vertical carriage is provided with supports adjustment mechanism, support adjustment mechanism is including supporting the slide bar, the surface of spacer bar and two the support spout has all been seted up to the relative surface of vertical carriage, the inner wall that supports the spout with the surface slip grafting that supports the slide bar.
Preferably, the outer surface of the adjusting screw is fixedly mounted on one side surface of the longitudinal supporting frame through a bearing, the outer surface of the adjusting screw is in threaded connection with an adjusting block, one side surface of the adjusting block is in sliding connection with one side surface of the longitudinal supporting frame, the outer surface of the adjusting screw is in threaded connection with two first nuts respectively, the two first nuts are arranged at the top and the bottom of the adjusting block respectively, the inner wall of the supporting leg is in threaded connection with the lower surface of the adjusting screw, and the outer surface of the supporting leg is in sliding connection with the inner wall of the longitudinal supporting frame;
according to the technical scheme, the two first nuts are unscrewed, the adjusting screw is rotated to drive the adjusting block to move downwards along the outer surface of the adjusting screw, the adjusting block moves downwards to drive the supporting legs to move downwards, the supporting legs move out of the longitudinal supporting frame along the inner wall of the longitudinal supporting frame and then rotate until the supporting legs are mutually perpendicular to the longitudinal supporting frame, the adjusting block and the supporting legs are driven to move upwards by reversely rotating the adjusting screw again until the bottoms of the supporting legs are horizontally aligned with the bottoms of the longitudinal supporting frame, the first nuts are screwed respectively, the adjusting block and the supporting legs are fixed respectively until the two first nuts form a vertically distributed state, the longitudinal supporting frame is supported through the supporting legs, the longitudinal supporting frame is prevented from being stressed and deviated, and meanwhile, the supporting legs and the longitudinal supporting frame are enabled to have a pre-tightening force, and the overall stability effect of the longitudinal supporting frame can be further ensured.
Preferably, the telescopic mechanism further comprises a first limiting groove, a plurality of first limiting grooves are uniformly formed in the outer surface of the U-shaped seat, a second limiting groove matched with the first limiting groove in size and shape is formed in the outer surface of the movable frame, and a limiting pin shaft is inserted into the inner walls of the first limiting groove and the second limiting groove in a sliding mode;
through above-mentioned technical scheme, because the left side face of the inside upper step at first excavation in tunnel, consequently put up advance support in advance, then the manual work rotates the left side rocker on the vertical carriage along the articulated shaft, withstand face top until left side rocker, with U type seat along the articulated shaft from the dead lever in roll-out as required, and will remove the frame and follow the pulling out in the U type seat, until the one end and the advance support contact of removing the frame, then will remove the frame through first spacing groove and second spacing groove with the stop pin axle and fix on U type seat.
Preferably, a fixed screw rod is connected to the surface of one side of the movable frame through threads, and a second nut is connected to the outer surface of the fixed screw rod through threads;
through above-mentioned technical scheme, remove the frame and be equipped with the one end and the advance support contact of fixation screw, unscrew the second nut, rotate fixation screw, fix fixation screw's one end and advance support, then screw up the second nut, fix fixation screw.
Preferably, the support adjusting mechanism further comprises support plates, the inner walls of the two longitudinal support frames are fixedly provided with the support plates, one ends of the support plates are fixedly connected with the outer surfaces of the spacer rods, the top of each support plate is fixedly provided with a telescopic cylinder, one end of a piston rod of each telescopic cylinder penetrates through and extends to the top of the longitudinal support frame and is fixedly connected with a lifting slide rail, and one ends of the two support slide bars are respectively and fixedly connected with two sides of the lower surface of the lifting slide rail;
through the technical scheme, when the longitudinal supporting frame is fixed, the piston rod of the Kuang Shensu air cylinder extends out to drive the lifting slide rail to move upwards according to the condition in the tunnel, and the lifting slide bar moves upwards to drive the two supporting slide bars to move upwards along the inner walls of the two supporting slide grooves respectively.
Preferably, a plurality of supporting seats are slidably clamped on the outer surface of the lifting slide rail, limiting slide blocks are respectively arranged on the left side and the right side of each supporting seat, clamping columns are respectively fixedly connected to two sides of the outer surface of each limiting slide block, elastic ropes are slidably sleeved on the outer surfaces of the clamping columns, and the inner surfaces of the elastic ropes are respectively sleeved with the outer surfaces of the clamping columns on the two limiting slide blocks;
through the technical scheme, the supporting seat is driven to shift up by the upward shift of lift slide rail, the advance support at tunnel top is supported by the upward shift of supporting seat, distance between each supporting seat can be adjusted as required, after the supporting seat moves to suitable position along the surface of lift slide rail, with the spacing slider of supporting seat both sides respectively with the surface contact of supporting seat on the lift slide rail, then cup joint with the jack post on two spacing slider in proper order with two stretch cords, elasticity through the stretch cord is fixed spacing slider and the surface of supporting seat, and then prevent that the supporting seat from removing.
The utility model provides a beneficial effect does:
1. through setting up the auxiliary stay mechanism, unscrew two first nuts, rotate adjusting screw and drive the regulating block and move down along adjusting screw's surface, the regulating block moves down and drives the supporting legs and move down, the supporting legs shifts out vertical carriage along the inner wall of vertical carriage, then rotate the supporting legs, until supporting legs and vertical carriage mutually perpendicular, reverse rotation adjusting screw drives regulating block and supporting legs and shifts up again, until the bottom of supporting legs aligns with the bottom level of vertical carriage, later screw up first nut respectively, until two first nuts fix regulating block and supporting legs respectively, support vertical carriage through the supporting legs, prevent that vertical carriage atress from taking place the skew, form the state of vertical distribution with vertical carriage with the supporting legs simultaneously and make the supporting legs have a pretightning force, thereby reach the effect of stable support vertical carriage.
2. By arranging the telescopic mechanism, the corresponding left swing frame or right swing frame on the longitudinal support frame is opened according to the excavation condition in the tunnel so as to support the tunnel face, the U-shaped seat is turned out from the fixed rod according to the distance between the left swing frame and the right swing frame and the advance support on the tunnel face, and the movable frame is pulled out so as to lead one end of the movable frame provided with the fixed screw rod to be contacted with the end after advancing, then the movable frame and the U-shaped seat are fixed through the insertion of the limiting pin shaft and the first limiting groove and the second limiting groove, the second nut is unscrewed, the fixing screw rod is rotated, one end of the fixing screw rod is fixed with the advance support, then the second nut is screwed, and the fixing screw rod is fixed, so that the effect of supporting the tunnel face is achieved.
3. Support adjustment mechanism through setting up, place the back at longitudinal support pole, the position of supporting seat on the lift slide rail has been adjusted according to the condition manual work in the tunnel, and carry on spacingly to the both sides of supporting seat through spacing slider, then cup joint through stretch cord and card post and fix the position of supporting seat, prevent that the supporting seat from removing wantonly, telescopic cylinder's piston rod stretches out and drives the lift slide rail and shift up, shift up of lift slide bar drives two and supports the slide bar and shift up along the inner wall of two support spouts respectively, shift up of lift slide rail drives the supporting seat and shifts up, shift up of supporting seat supports the advance support at tunnel top, thereby reach the effect of supporting the tunnel inner wall.
Drawings
Fig. 1 is a schematic view of an upper step supporting device for a tunnel three-step excavation method provided by the utility model;
fig. 2 is a perspective view of a spacer bar structure of a supporting device for an upper step of a tunnel three-step excavation method provided by the utility model;
fig. 3 is a perspective view of a longitudinal support frame structure of the upper step support device for the tunnel three-step excavation method provided by the utility model;
fig. 4 is a perspective view of an adjusting screw structure of the upper step supporting device of the tunnel three-step excavation method provided by the utility model;
fig. 5 is a perspective view of a left swing frame structure of the upper step supporting device of the tunnel three-step excavation method provided by the utility model;
fig. 6 is a perspective view of a U-shaped seat structure of a supporting device for upper steps of a three-step tunnel excavation method according to the present invention;
fig. 7 is a perspective view of a supporting slide bar structure of a supporting device for an upper step of a tunnel three-step excavation method provided by the utility model;
fig. 8 is the utility model provides a three step excavation methods in tunnel supporting seat structure stereogram of upper step strutting arrangement.
In the figure: 1. a longitudinal support frame; 2. a spacer bar; 3. supporting legs; 31. adjusting the screw rod; 32. an adjusting block; 33. a first nut; 4. a left swing frame; 5. a right swing frame; 6. a fixing rod; 7. a U-shaped seat; 8. moving the frame; 81. a first limit groove; 82. a second limit groove; 83. a limiting pin shaft; 84. fixing the screw rod; 85. a second nut; 9. supporting the sliding rod; 91. a support plate; 92. a telescopic cylinder; 93. lifting the slide rail; 94. a supporting seat; 95. a limiting slide block; 96. clamping the column; 97. an elastic cord; 10. the supporting chute.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1-8, a supporting device for climbing up a step in a tunnel three-step excavation method comprises a longitudinal supporting frame 1, spacer rods 2 are fixedly mounted on two sides of the inner surface of the longitudinal supporting frame 1 respectively, an auxiliary supporting mechanism is arranged on the surface of one side of the longitudinal supporting frame 1, the auxiliary supporting mechanism comprises supporting legs 3 and adjusting screws 31, and the supporting legs 3 are driven to move by rotating the adjusting screws 31.
In order to prevent the longitudinal supporting frame 1 from being stressed and deviated, the outer surface of the adjusting screw 31 is fixedly installed on one side surface of the longitudinal supporting frame 1 through a bearing, the outer surface of the adjusting screw 31 is in threaded connection with an adjusting block 32, one side surface of the adjusting block 32 is in sliding connection with one side surface of the longitudinal supporting frame 1, the outer surface of the adjusting screw 31 is in threaded connection with two first nuts 33 respectively, the two first nuts 33 are arranged at the top and the bottom of the adjusting block 32 respectively, the inner wall of the supporting leg 3 is in threaded connection with the lower surface of the adjusting screw 31, and the outer surface of the supporting leg 3 is in sliding connection with the inner wall of the longitudinal supporting frame 1.
Through setting up the auxiliary stay mechanism, unscrew two first nuts 33, rotate adjusting screw 31 and drive adjusting block 32 and move down along adjusting screw 31's surface, adjusting block 32 moves down and drives supporting legs 3 and move down, supporting legs 3 shifts out vertical carriage 1 along the inner wall of vertical carriage 1, then rotate supporting legs 3, until supporting legs 3 and vertical carriage 1 mutually perpendicular, reverse rotation adjusting screw 31 again drives adjusting block 32 and supporting legs 3 and moves up, until the bottom of supporting legs 3 aligns with the bottom level of vertical carriage 1, later screw up first nut 33 respectively, until two first nuts 33 fix adjusting block 32 and supporting legs 3 respectively, support vertical carriage 1 through supporting legs 3, prevent that vertical carriage 1 atress from taking place to squint, form the state of vertical distribution with vertical carriage 1 with supporting legs 3 simultaneously and make supporting legs 3 have a pretightning force, thereby reach the effect of stable support longitudinal carriage 1.
The top of vertical carriage 1 is provided with supports adjustment mechanism, supports adjustment mechanism and has all seted up support spout 10 including supporting slide bar 9, the surface of spacer bar 2 and the relative surface of two vertical carriages 1, and the inner wall that supports spout 10 is pegged graft with the surface slip that supports slide bar 9.
In order to support tunnel inner wall top, support adjustment mechanism still includes backup pad 91, the inner wall fixed mounting of two vertical carriage 1 has backup pad 91, the one end of backup pad 91 and the surface fixed connection of spacer bar 2, the top fixed mounting of backup pad 91 has telescopic cylinder 92, telescopic cylinder 92's piston rod one end runs through the top that extends to vertical carriage 1 and fixedly connected with lift slide rail 93, two one end that support slide bar 9 respectively with lift slide rail 93's lower surface both sides fixed connection, lift slide rail 93's surface slip joint has a plurality of supporting seats 94, the left and right sides of supporting seat 94 is provided with spacing slider 95 respectively, spacing slider 95's surface both sides fixedly connected with card post 96 respectively, the surface slip of card post 96 has cup jointed stretch cord 97, the internal surface of stretch cord 97 cup joints with the card post 96 surface on two spacing slider 95 respectively.
The left and right sides of vertical braced frame 1 articulates through the articulated shaft respectively has left swing frame 4 and right swing frame 5, and the surface of one side of left swing frame 4 and right swing frame 5 is fixed mounting respectively has two dead levers 6, and the relative surface one side of two dead levers 6 articulates through the articulated shaft has the inner wall of U type seat 7,U type seat 7 to be provided with telescopic machanism, and telescopic machanism is including removing frame 8, removes the surface of frame 8 and the inner wall slip joint of U type seat 7.
In order to support the face, the telescopic mechanism further comprises a first limiting groove 81, the outer surface of the U-shaped seat 7 is uniformly formed in the plurality of first limiting grooves 81, a second limiting groove 82 matched with the first limiting groove 81 in size and shape is formed in the outer surface of the movable frame 8, a limiting pin shaft 83 is inserted into the inner walls of the first limiting groove 81 and the second limiting groove 82 in a sliding mode, a fixing screw rod 84 is connected to one side surface of the movable frame 8 in a threaded mode, and a second nut 85 is connected to the outer surface of the fixing screw rod 84 in a threaded mode.
By arranging the telescopic mechanism, according to the excavation condition in the tunnel, the corresponding left swing frame 4 or right swing frame 5 on the longitudinal supporting frame 1 is opened to support the tunnel face, the U-shaped seat 7 is turned out from the fixed rod 6 according to the distance between the left swing frame 4 and the right swing frame 5 and the advance support on the tunnel face, the movable frame 8 is pulled out to enable one end, provided with the fixed screw rod 84, of the movable frame 8 to be in contact with the advance end, then the movable frame 8 and the U-shaped seat 7 are fixed through the insertion of the limit pin shaft 83 and the first limit groove 81 and the second limit groove 82, the second nut 85 is unscrewed, the fixed screw rod 84 is rotated to fix one end of the fixed screw rod 84 and the advance support, then the second nut 85 is screwed, and the fixed screw rod 84 is fixed, so that the effect of supporting the tunnel face is achieved.
The working principle is as follows: before use, the two first nuts 33 are unscrewed, the adjusting screw 31 is rotated to drive the adjusting block 32 to move downwards along the outer surface of the adjusting screw 31, the adjusting block 32 moves downwards to drive the supporting foot 3 to move downwards, the supporting foot 3 moves out of the longitudinal supporting frame 1 along the inner wall of the longitudinal supporting frame 1, then the supporting foot 3 is rotated until the supporting foot 3 is perpendicular to the longitudinal supporting frame 1, then the adjusting screw 31 is rotated reversely to drive the adjusting block 32 and the supporting foot 3 to move upwards until the bottom of the supporting foot 3 is horizontally aligned with the bottom of the longitudinal supporting frame 1, and then the first nuts 33 are screwed respectively until the adjusting block 32 and the supporting foot 3 are respectively fixed by the two first nuts 33;
then, the longitudinal supporting frame 1 is placed at the middle section of the upper step of the tunnel for supporting, a piston rod of a telescopic cylinder 92 extends out to drive a lifting slide rail 93 to move upwards according to the condition in the tunnel, the lifting slide rail moves upwards to drive two supporting slide bars 9 to respectively move upwards along the inner walls of two supporting slide grooves 10, the lifting slide rail 93 moves upwards to drive a supporting seat 94 to move upwards, and the supporting seat 94 moves upwards to support the advance support at the top of the tunnel;
when the position of each supporting seat 94 needs to be adjusted, before the telescopic cylinder 92 works, the position of the supporting seat 94 on the lifting slide rail 93 is manually adjusted, after the supporting seat 94 moves to a proper position, the limiting slide blocks 95 on the two sides of the supporting seat 94 respectively move to be in contact with the supporting seat 94 along the outer surface of the lifting slide bar, the elastic rope 97 is sleeved with the clamping column 96, and the supporting seat 94 is fixed at the position through the elasticity of the elastic rope 97;
according to the excavated tunnel face, the left swing frame 4 or the right swing frame 5 is manually rotated along the hinge shaft until the left swing frame 4 or the right swing frame 5 props up the upper part of the tunnel face, the U-shaped seat 7 is rotated out of the fixed rod 6 along the hinge shaft according to the tunnel condition, the movable frame 8 is pulled out of the U-shaped seat 7 until one end of the movable frame 8 with the fixed screw 84 is in contact with the advance support, the movable frame 8 is fixed on the U-shaped seat 7 through the first limiting groove 81 and the second limiting groove 82 by the limiting pin shaft 83, the second nut 85 is unscrewed, the fixed screw 84 is rotated, one end of the fixed screw 84 is fixed with the advance support, the second nut 85 is screwed, the fixed screw 84 is fixed, and the inner wall of the step on the tunnel is further supported.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. The utility model provides a three step excavation methods in tunnel goes up step strutting arrangement, includes vertical carriage (1), its characterized in that: the two sides of the inner surface of the longitudinal supporting frame (1) are respectively and fixedly provided with a spacer bar (2), the surface of one side of the longitudinal supporting frame (1) is provided with an auxiliary supporting mechanism, the auxiliary supporting mechanism comprises supporting legs (3) and an adjusting screw rod (31), and the supporting legs (3) are driven to move by rotating the adjusting screw rod (31);
the left side and the right side of the longitudinal supporting frame (1) are respectively hinged with a left swing frame (4) and a right swing frame (5) through hinged shafts, one side surfaces of the left swing frame (4) and the right swing frame (5) are respectively and fixedly provided with two fixing rods (6), one sides of opposite surfaces of the two fixing rods (6) are hinged with a U-shaped seat (7) through hinged shafts, the inner wall of the U-shaped seat (7) is provided with a telescopic mechanism, the telescopic mechanism comprises a moving frame (8), and the outer surface of the moving frame (8) is in sliding clamping connection with the inner wall of the U-shaped seat (7);
the top of vertical carriage (1) is provided with supports adjustment mechanism, support adjustment mechanism including supporting slide bar (9), the surface of spacer bar (2) with support spout (10) have all been seted up on the relative surface of vertical carriage (1), the inner wall that supports spout (10) with the surface slip grafting that supports slide bar (9).
2. The supporting device for the upper steps of the tunnel three-step excavation method according to claim 1, wherein: the surface of adjusting screw (31) passes through a side surface of bearing fixed mounting at vertical carriage (1), the surface threaded connection of adjusting screw (31) has regulating block (32), a side surface of regulating block (32) with a side surface sliding connection of vertical carriage (1), the surface of adjusting screw (31) threaded connection respectively has two first nuts (33), two first nut (33) set up respectively the top and the bottom of regulating block (32), the inner wall of supporting legs (3) with the lower surface threaded connection of adjusting screw (31), the surface of supporting legs (3) with the inner wall sliding connection of vertical carriage (1).
3. The supporting device for the upper steps of the tunnel three-step excavation method according to claim 1, wherein: the telescopic mechanism further comprises a first limiting groove (81), the first limiting groove (81) is uniformly formed in the outer surface of the U-shaped seat (7), a second limiting groove (82) matched with the first limiting groove (81) in size and shape is formed in the outer surface of the movable frame (8), and a limiting pin shaft (83) is inserted into the inner wall of the first limiting groove (81) and the inner wall of the second limiting groove (82) in a sliding mode.
4. The supporting device for the upper steps of the tunnel three-step excavation method according to claim 1, wherein: and the surface of one side of the movable frame (8) is in threaded connection with a fixed screw rod (84), and the outer surface of the fixed screw rod (84) is in threaded connection with a second nut (85).
5. The supporting device for the upper steps of the tunnel three-step excavation method according to claim 1, wherein: support adjustment mechanism still includes backup pad (91), two the inner wall fixed mounting of vertical carriage (1) has backup pad (91), the one end of backup pad (91) with the outer fixed surface of spacer bar (2) is connected, the top fixed mounting of backup pad (91) has telescopic cylinder (92), the piston rod one end of telescopic cylinder (92) runs through and extends to the top and the fixedly connected with lift slide rail (93) of vertical carriage (1).
6. The supporting device for the upper steps of the tunnel three-step excavation method according to claim 5, wherein: the outer surface slip joint of lift slide rail (93) has a plurality of supporting seats (94), the left and right sides of supporting seat (94) is provided with limit slide (95) respectively, the outer surface both sides fixedly connected with card post (96) respectively of limit slide (95), the surface slip of card post (96) has cup jointed stretch cord (97), the internal surface of stretch cord (97) respectively with two on limit slide (95) card post (96) surface cup joints.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008466.9U CN218177251U (en) | 2022-08-01 | 2022-08-01 | Upper step supporting device for tunnel three-step excavation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008466.9U CN218177251U (en) | 2022-08-01 | 2022-08-01 | Upper step supporting device for tunnel three-step excavation method |
Publications (1)
| Publication Number | Publication Date |
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| CN218177251U true CN218177251U (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222008466.9U Active CN218177251U (en) | 2022-08-01 | 2022-08-01 | Upper step supporting device for tunnel three-step excavation method |
Country Status (1)
| Country | Link |
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| CN (1) | CN218177251U (en) |
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2022
- 2022-08-01 CN CN202222008466.9U patent/CN218177251U/en active Active
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