CN113944169B - Inner support connecting device for deep foundation pit supporting system - Google Patents
Inner support connecting device for deep foundation pit supporting system Download PDFInfo
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- CN113944169B CN113944169B CN202111281818.1A CN202111281818A CN113944169B CN 113944169 B CN113944169 B CN 113944169B CN 202111281818 A CN202111281818 A CN 202111281818A CN 113944169 B CN113944169 B CN 113944169B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention provides an inner support connecting device for a deep foundation pit supporting system, which comprises an inner support connecting main body and an inner support connecting end, wherein the inner support connecting main body is used for adapting to length change, the inner support connecting main bodies are connected through bolts according to different supporting lengths, the inner support connecting main bodies are fixed at two ends of each inner support connecting main body through the bolts, the strokes can be finely adjusted, so that the construction is light and convenient, a certain prepressing (tightening) force can be conveniently provided for supporting through manual operation, collapse can be effectively prevented, the displacement after the telescopic rod is fixed can be effectively reduced, the supporting stability is improved, the stress between an adjusting nut and a thread can be effectively reduced through the supporting action of fluid, the service lives of the adjusting nut and the telescopic rod can be prolonged, the telescopic rod and a self-locking type telescopic device can be adjusted by using the same tool, the operation is more convenient, whether the telescopic rod is displaced or not can be more intuitively known through air pressure monitoring, and the safety is higher.
Description
Technical Field
The invention relates to a supporting device, in particular to an inner support connecting device for a deep foundation pit supporting system.
Background
The deep foundation pit support is a measure for retaining, reinforcing and protecting the side wall of the deep foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit; when a construction site does not have a slope-releasing condition, the slope releasing can not ensure the construction safety or the construction needs can not be met by releasing the slope and additionally arranging a temporary support, a supporting structure is generally adopted for temporary retaining so as to ensure the stability of the soil wall of the foundation pit.
The supporting structure is selected from row piles or underground continuous walls, cement-soil walls, reverse arch walls or the combination of the above types.
(1) The row piles or underground continuous walls are generally composed of enclosure walls, supports (or soil anchors), impervious curtains and the like. The row piles can be cantilever type supporting structures, pull-anchor type supporting structures, inner-support type supporting structures and anchor rod type supporting structures according to engineering conditions. Underground diaphragm walls may be used in combination with internal supports, reverse-construction, and semi-reverse-construction. The continuous wall has the advantages of small construction vibration, low noise, large wall rigidity, good anti-seepage performance and small disturbance to surrounding foundations, and can form the continuous wall with large bearing capacity.
(2) Cement-soil pile wall the cement-soil pile wall is protected by the self-weight and rigidity of the cement-soil pile wall, generally no support is arranged, and the support can be locally arranged after measures are taken under special conditions. The cement-soil wall is of a deep mixing cement-soil pile wall, a high-pressure rotary spraying pile wall and the like, and is usually arranged in a lattice manner. The application conditions are that the safety grade of the side wall of the foundation pit is preferably two or three, the bearing capacity of the foundation soil is not more than 150kPa within the construction range of the cement soil pile, and the depth of the foundation pit is not more than 6m.
(3) When the plane shape of the foundation pit is proper, the inverse arch wall can be used as a protective wall. The arch wall comprises a circular closed arch wall, an oval closed arch wall and a combined arch wall. For a composite arch wall, the partial arch wall can be considered as two hinged arches.
The traditional hydraulic thousand golden top pushing has strict operation space requirements and needs to continuously provide hydraulic pressure and larger weight, so that the operation is very inconvenient; and when the inner support connection of the support is slightly displaced, the support cannot be known in time, the support cannot be prevented from getting in the bud, and the support is not safe enough.
Disclosure of Invention
In view of the above, the invention aims to provide an inner support connecting device for a deep foundation pit supporting system, which comprises an inner support connecting body adapted to length change and an inner support connecting end capable of adjusting a stroke, wherein a plurality of inner support connecting bodies are connected through bolts according to different support lengths, the two ends of each inner support connecting body are fixed with the inner support connecting end through bolts, each inner support connecting end comprises a connecting disc, a column body and an end plate connected through a stroke adjusting structure, each stroke adjusting structure comprises a telescopic accommodating cavity in the column body, an adjusting nut capable of being rotatably adjusted is fixed at the end of the column body, a telescopic rod is connected to the adjusting nut through a thread, one section of the telescopic rod extends into the telescopic accommodating cavity, and the other end of the telescopic rod is fixedly connected with the end plate.
As a further improvement of the above scheme:
preferably, the flexible back flush structure that still is equipped with the counter-acting force that provides the telescopic link that holds the intracavity, back flush structure includes the first sealed dish of telescopic link tip, first sealed dish size holds chamber size adaptation with flexible, be equipped with sealing washer and seal groove on the first sealed dish, the flexible one end that holds the chamber and keep away from the telescopic link is equipped with the mouth that passes through of control fluid business turn over.
Preferably, be connected with through the mouth and be used for adjusting the internal pressure's of recoil pressure structure recoil pressure adjusting device, recoil pressure adjusting device includes recoil pressure adjusting device main part, leave the cavity in the anti-punching press adjusting device main part, the adjusting device main part internal fixation has the division board, be equipped with the air vent on the division board, the air vent is connected with the trachea, the trachea is connected with the business turn over gas switch in the recoil pressure adjusting device main part, the division board separates the cavity for control chamber and surge chamber, be equipped with the auto-lock type telescoping device who drives the push pedal along axis reciprocating motion in the control chamber, sliding connection has first slide bar on the division board, the one end that first slide bar is located the control chamber is connected with the connecting plate, the other end is connected with the push pedal, leave the air gap between push pedal and the recoil pressure adjusting device main part inner wall, the connecting plate is fixed connection with auto-lock type telescoping device's flexible end, central part slot has been seted up to push pedal and first slide bar, sliding connection has the second slide bar, second slide bar end connection has the second sealed dish.
Preferably, the partition plate is provided with a mounting groove, an air pressure sensor is mounted in the mounting groove, and the air pressure sensor is connected with a display on the outer wall of the back pressure adjusting device main body.
Preferably, the size of the push plate is matched with the size of the main body of the back-flushing adjusting device, a plurality of vent grooves are formed in the push plate, and the vent grooves are uniformly distributed along the edge of the push plate.
Preferably, the size of the second sealing disc is matched with the main body of the back pressure adjusting device, and a sealing ring and a sealing groove are arranged on the second sealing disc.
Preferably, self-locking telescoping device includes mount pad, flexible main part and flexible end, mount pad and recoil pressure adjusting device main part one end fixed connection, be fixed with first support on the mount pad, it is connected with a plurality of first connecting rods to rotate through the fixed pin on the first support, the first connecting rod other end passes through the fixed pin rotation with second support, third support respectively and is connected, be connected with two-way screw rod through the screw hole between second support, the third support, two-way screw rod one end is equipped with the handle, it is connected with a plurality of second connecting rods to rotate through the fixed pin on second support, the third support, the second connecting rod other end passes through the fixed pin and is connected with the fourth support rotation, synthetic rhombus is enclosed on vertical face to first connecting rod and second connecting rod, fourth support and flexible end fixed connection.
Preferably, the bidirectional screw rod passes through the third support and the recoil pressure adjusting device main body to be fixedly connected with the operating nut, the operating nut is matched with the bidirectional screw rod in size, and a strip-shaped hole for the bidirectional screw rod to move is formed in the recoil pressure adjusting device main body.
Compared with the prior art, the invention has the following beneficial effects:
1. the length of the telescopic rod extending out or retracting back can be adjusted by adjusting the nut, so that the end plate at the end part of the telescopic rod tightly props against the foundation pit, the adjustable telescopic rod is suitable for small-distance adjustment, double control of stroke and force is realized by utilizing the pressed jacking force of the screw rod, the stroke can be finely adjusted, the construction is light and convenient, and collapse can be effectively prevented;
2. the supporting force is given to the first sealing disc by controlling the fluid volume contained between the first sealing disc and the telescopic containing cavity, when an acting force in the direction of inwards supporting and connecting the end head is generated on the end plate by a foundation pit, the adjusting nut provides a reaction force for the telescopic rod through the threads, the fluid contained between the first sealing disc and the telescopic containing cavity can provide a reaction force for the first sealing disc, the stress between the adjusting nut and the threads can be effectively reduced through the supporting action of the fluid, the service life of the adjusting nut and the telescopic rod can be prolonged, the displacement after the telescopic rod is fixed can be effectively reduced, and the supporting stability is improved;
3. the fluid entering between the first sealing disc and the telescopic containing cavity can be effectively regulated through the recoil pressure regulating device, so that the stress between the regulating nut and the threads on the telescopic rod is balanced, stress concentration between the regulating nut and the threads on the telescopic rod can be avoided, meanwhile, certain pressure is kept, so that the regulating nut and the telescopic rod are connected in a threaded mode and are fastened more tightly, meanwhile, the fluid can generate enough supporting force for the first sealing disc, the telescopic rod is prevented from being displaced after being fastened in place, and the foundation pit support is more stable;
4. the strength of the push plate can be ensured, meanwhile, gas can pass through the push plate, and the size of the push plate is matched with the size of the main body of the back-flushing pressure adjusting device, so that the push plate can move more stably;
5. the push plate can be pushed out or retracted by adjusting the telescopic main body, so that fluid is controlled to be discharged into or out of the space between the first sealing disc and the telescopic accommodating cavity, the supporting force provided for the first sealing disc can be controlled, the second support and the third support can be simultaneously controlled to move in opposite directions by using the bidirectional screw, and after the bidirectional screw moves to a specified position, self-locking can be completed under the action of internal force due to opposite thread directions at two ends of the bidirectional screw when the bidirectional screw is not operated;
6. an air pressure cavity is formed between the separation plate and the second sealing disc, the stress between the bidirectional screw rod of the self-locking type expansion device and the second support and the stress between the bidirectional screw rod and the third support can be balanced by blowing gas into the gas pressure cavity, the service life of the self-locking type telescopic device is prolonged;
7. can change through the atmospheric pressure on the atmospheric pressure monitoring device to can know the operating condition of self-locking telescoping device, can know whether the telescopic link has taken place the displacement.
8. The telescopic rod and the self-locking type telescopic device can be adjusted by using the same tool, and the operation is more convenient and faster.
Drawings
FIG. 1 is an overall structural view of the present invention.
Fig. 2 is a partial sectional structural view of fig. 1.
Fig. 3 is a partially enlarged view.
Fig. 4 is a second partial enlarged view.
Fig. 5 is a third enlarged view of a part.
Reference numerals: 1. an end plate; 2. adjusting the nut; 3. a cylinder; 4. a back pressure regulating device; 5. operating the nut; 6. a display; 7. an air inlet and outlet switch; 8. a telescopic rod; 9. a first sealing disk; 10. a telescopic accommodating cavity; 11. a mounting seat; 12. a first support; 13. a first link; 14. a second support; 15. a bidirectional screw; 16. a second link; 17. a third support; 18. a fourth support; 19. a telescopic end; 20. a connecting plate; 21. a partition plate; 22. pushing the plate; 23. a first slide bar; 24. a second slide bar; 25. a second sealing disk; 26. a through port; 27. a vent channel; 28. and (7) connecting the disc.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example (b):
as shown in fig. 1 to 5, an inner support connecting device for a deep foundation pit supporting system comprises an inner support connecting body adapted to length changes and an inner support connecting end capable of adjusting a stroke, wherein a plurality of inner support connecting bodies are connected through bolts according to different support lengths, the two ends of each inner support connecting body are fixedly connected through the bolts, each inner support connecting end comprises a connecting disc 28, a column 3 and an end plate 1 connected through a stroke adjusting structure, each stroke adjusting structure comprises a telescopic accommodating cavity 10 inside the column 3, an adjusting nut 2 capable of being rotatably adjusted is fixed at the end of the column 3, a telescopic rod 8 is connected to each adjusting nut 2 through threads, one section of the telescopic rod 8 extends into the telescopic accommodating cavity 10, the other end of the telescopic rod is fixedly connected with the end plate 1, the length of the telescopic rod 8 extending out or retracting back can be adjusted through the adjusting nut 2, the end plate 1 at the end of the telescopic rod 8 can support a foundation pit tightly, the telescopic rod is suitable for small-distance tight adjustment, stroke and force adjustment can be finely adjusted by using the jacking force of a double-control screw rod, so that the stroke and the construction is light and convenient, and collapse can be effectively prevented.
The flexible recoil pressure structure that still is equipped with in holding chamber 10 and provides reverse action force to telescopic link 8, recoil pressure structure includes the first sealed dish 9 of 8 tip of telescopic link, first sealed dish 9 size holds 10 size adaptations with flexible, be equipped with sealing washer and seal groove on the first sealed dish 9, the flexible one end that holds chamber 10 and keep away from telescopic link 8 is equipped with the mouth 26 that passes through of control fluid business turn over, hold the fluid volume that holds between the chamber 10 through controlling first sealed dish 9 and flexible, thereby give a holding power of first sealed dish 9, when the foundation ditch produced the effort of inside support connection end direction to end plate 1, adjusting nut 2 provides a reaction force for telescopic link 8 through the screw thread, the fluid that holds between chamber 10 between first sealed dish 9 and the flexible fluid can provide a reaction force to first sealed dish 9, can effectively reduce the stress between adjusting nut 2 and the screw thread through fluidic supporting role, thereby can improve adjusting nut 2 and telescopic link 8's life, and can effectively reduce the displacement volume after telescopic link 8 is fixed, thereby improve and strut stability.
The back-flushing adjusting device 4 used for adjusting the internal pressure of the back-flushing structure is connected with the through port 26, the back-flushing adjusting device 4 comprises a back-flushing adjusting device 4 main body, a cavity is reserved in the back-flushing adjusting device 4 main body, a partition plate 21 is fixed in the adjusting device main body, a vent hole is formed in the partition plate 21 and connected with an air pipe, the air pipe is connected with an air inlet and outlet switch 7 in the back-flushing adjusting device 4 main body, the cavity is divided into an operation chamber and a pressure regulating chamber by the partition plate 21, a self-locking type expansion device driving the push plate 22 to reciprocate along the axis is arranged in the operation chamber, a first slide rod 23 is connected onto the partition plate 21 in a sliding manner, one end of the first slide rod 23 in the operation chamber is connected with a connecting plate 20, the other end of the first slide rod is connected with the push plate 22, and an air gap is reserved between the push plate 22 and the inner wall of the back-flushing adjusting device 4 main body, the connecting plate 20 is fixedly connected with a telescopic end 19 of the self-locking type telescopic device, a slot is formed in the central parts of the push plate 22 and the first slide bar 23, a second slide bar 24 is connected in the slot in a sliding manner, the end part of the second slide bar 24 is connected with a second sealing disc 25, fluid entering between the first sealing disc 9 and the telescopic accommodating cavity 10 can be effectively adjusted through the recoil pressure adjusting device 4, so that stress between the adjusting nut 2 and threads on the telescopic rod 8 is balanced, stress concentration between the adjusting nut 2 and the threads of the telescopic rod 8 can be avoided, meanwhile, certain pressure is kept, the adjusting nut 2 and the telescopic rod 8 are connected in a threaded manner and are fastened, meanwhile, enough supporting force can be generated on the first sealing disc 9 by the fluid, displacement generated after the telescopic rod 8 is fastened in place is avoided, and foundation pit supporting is more stable;
a gas pressure cavity is formed between the partition plate 21 and the second sealing disc 25, and gas is blown into the gas pressure cavity, so that the stress between the two-way screw 15 of the self-locking expansion device and the second support 14 and the third support 17 can be balanced, and the service life of the self-locking expansion device is prolonged.
The size of the push plate 22 is matched with the main body size of the recoil pressure adjusting device 4, a plurality of vent grooves 27 are formed in the push plate 22, the vent grooves 27 are uniformly distributed along the edge of the push plate 22, gas can pass through the push plate 22 when the strength of the push plate 22 can be guaranteed, and the size of the push plate 22 is matched with the main body size of the recoil pressure adjusting device 4, so that the push plate 22 can move more stably.
The size of the second sealing disc 25 is matched with the main body of the back pressure adjusting device 4, and a sealing ring and a sealing groove are arranged on the second sealing disc 25, so that the sealing property can be enhanced, and fluid leakage is avoided.
The self-locking type telescopic device comprises a mounting seat 11, a telescopic main body and a telescopic end 19, the mounting seat 11 is fixedly connected with one end of a main body of a recoil pressure adjusting device 4, a first support 12 is fixed on the mounting seat 11, a plurality of first connecting rods 13 are rotatably connected on the first support 12 through fixing pins, the other end of each first connecting rod 13 is rotatably connected with a second support 14 and a third support 17 through fixing pins, the second support 14 and the third support 17 are connected with a bidirectional screw 15 through threaded holes, one end of the bidirectional screw 15 is provided with an operating handle, the second support 14 and the third support 17 are rotatably connected with a plurality of second connecting rods 16 through fixing pins, the other end of each second connecting rod 16 is rotatably connected with a fourth support 18 through fixing pins, the first connecting rod 13 and the second connecting rod 16 enclose a rhombus, the fourth support 18 is fixedly connected with the telescopic end 19, the push plate 22 can be pushed out or retracted by adjusting the telescopic main body, so that fluid is controlled to be discharged into or discharged between the first support 9 and the telescopic accommodating cavity 10, the sealing disc 9 can be controlled, the supporting force effect of the first sealing disc 9 can be controlled, the second support 15 can be controlled, the two screw 15 can be moved in the opposite directions, and the two-way, and the two-direction of the two-way screw 15 can be controlled when the two-direction is controlled.
Two-way screw rod 15 passes third support 17 and 4 main parts of recoil pressure adjusting device and 5 fixed connection of operation nut, the size and the 15 adaptations of two-way screw rod of operation nut 5, set up the bar hole that supplies 15 removals of two-way screw rod in the anti-punching press adjusting device 4 main part, use the same instrument can adjust telescopic link 8 and self-locking telescoping device, operate more convenient.
The working principle of the invention is as follows: connect a plurality of interior support connecting bodies in proper order earlier, then connect the interior support connection end that can adjust the stroke at interior support connecting body both ends, open business turn over air switch 7 earlier, thereby make the air admission division board 21 and second sealed dish 25 between, then rotate adjusting nut 2 with the instrument, make telescopic link 8 stretch out until end plate 1 support on the foundation ditch wall, telescopic link 8 removes the in-process because first sealed dish 9, flexible chamber 10 that holds, the surge chamber, be encapsulated situation between the second sealed dish 25, and inside is equipped with hydraulic oil, first sealed dish 9 removes and thereby can drive second sealed dish 25 and remove, accomplish the back of removing, rotate operating nut 5 with the instrument, thereby adjust reverse punching press adjusting device 4, make flexible end 19 drive push pedal 22 remove to second sealed dish 25 along second slide bar 24, until push pedal 22 tightly pushes up on second sealed dish 25, then through vacuum generation gas to business turn over air switch 7 in the air feed and pressurize, the business turn over air switch 7 is closed after the pressurization is accomplished.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the claims of the present invention should not be limited by the above-mentioned embodiments, because the modifications, equivalent variations, improvements, etc. made in the claims of the present invention still fall within the scope of the present invention.
Claims (6)
1. The utility model provides an interior support connecting device for deep basal pit supporting system which characterized in that: the stroke adjusting mechanism comprises an inner support connecting main body and an inner support connecting end, wherein the inner support connecting main body is used for adapting to length change, the inner support connecting end can adjust stroke, a plurality of inner support connecting main bodies are connected through bolts according to different support lengths, two ends of each inner support connecting main body are fixed with the inner support connecting end through bolts, each inner support connecting end comprises a connecting disc, a cylinder and an end plate which is connected through a stroke adjusting structure, the stroke adjusting structure comprises a telescopic accommodating cavity in the cylinder, an adjusting nut which can be rotationally adjusted is fixed at the end part of the cylinder, a telescopic rod is connected onto the adjusting nut through threads, and one section of the telescopic rod extends into the telescopic accommodating cavity while the other end of the telescopic rod is fixedly connected with the end plate;
a back-pressing structure for providing a reverse acting force for the telescopic rod is further arranged in the telescopic accommodating cavity, the back-pressing structure comprises a first sealing disc at the end of the telescopic rod, the size of the first sealing disc is matched with that of the telescopic accommodating cavity, a sealing ring and a sealing groove are arranged on the first sealing disc, and a through hole for controlling fluid to enter and exit is formed in one end, away from the telescopic rod, of the telescopic accommodating cavity;
the utility model discloses a pressure regulating device, including back-flushing adjusting device main part, cavity, axis reciprocating motion's auto-lock type telescoping device is followed to drive push pedal in the control chamber, sliding connection has first slide bar on the division board, first slide bar is located the control chamber one end and is connected with the connecting plate, the other end is connected with the push pedal, leave air gap between push pedal and the back-flushing adjusting device main part inner wall, connecting plate and auto-lock type telescoping device's flexible end fixed connection, the slot has been seted up to push pedal and first slide bar, sliding connection has the second slide bar in the slot, second slide bar end connection has the second sealed dish.
2. The internal support connecting device for a deep foundation pit supporting system according to claim 1, wherein: the separating plate is provided with a mounting groove, an air pressure sensor is mounted in the mounting groove, and the air pressure sensor is connected with a display on the outer wall of the back pressure adjusting device main body.
3. The internal support connection device for a deep foundation pit support system according to claim 2, wherein: adjusting device main part size adaptation is pressed with the recoil to the push pedal size, a plurality of air channels have been seted up in the push pedal, air channel is along push pedal edge evenly distributed.
4. The internal support connection device for a deep foundation pit support system of claim 3, wherein: the size of the second sealing disc is matched with that of the back-flushing adjusting device body, and a sealing ring and a sealing groove are arranged on the second sealing disc.
5. An internal support connection for a deep foundation pit bracing system according to any one of claims 1 to 4, wherein: the self-locking type telescopic device comprises a mounting seat, a telescopic main body and a telescopic end, wherein the mounting seat is fixedly connected with one end of a recoil pressure adjusting device main body, a first support is fixed on the mounting seat, a plurality of first connecting rods are connected to the first support in a rotating mode through fixing pins, the other end of each first connecting rod is connected with a second support and a third support in a rotating mode through the fixing pins, the second support and the third support are connected with a bidirectional screw through threaded holes, one end of the bidirectional screw is provided with an operating handle, the second support and the third support are connected with a plurality of second connecting rods in a rotating mode through the fixing pins, the other end of each second connecting rod is connected with a fourth support in a rotating mode through the fixing pins, the first connecting rods and the second connecting rods surround a rhombus on a vertical face, and the fourth support is fixedly connected with the telescopic end.
6. The internal support connection device for a deep foundation pit support system according to claim 5, wherein: the bidirectional screw rod passes through the third support and the back-flushing pressure adjusting device main body to be fixedly connected with the operating nut, the size of the operating nut is matched with the bidirectional screw rod, and a strip-shaped hole for the bidirectional screw rod to move is formed in the back-flushing pressure adjusting device main body.
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| CN202111281818.1A CN113944169B (en) | 2021-11-01 | 2021-11-01 | Inner support connecting device for deep foundation pit supporting system |
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| CN116122304A (en) * | 2023-03-16 | 2023-05-16 | 中国铁路广州局集团有限公司站房建设指挥部 | Deep foundation pit support changing device with adjustable supporting force |
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