CN116216493A - Negative ring pipe piece hoisting and dismantling assembly and dismantling method - Google Patents
Negative ring pipe piece hoisting and dismantling assembly and dismantling method Download PDFInfo
- Publication number
- CN116216493A CN116216493A CN202310208617.1A CN202310208617A CN116216493A CN 116216493 A CN116216493 A CN 116216493A CN 202310208617 A CN202310208617 A CN 202310208617A CN 116216493 A CN116216493 A CN 116216493A
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- Prior art keywords
- lifting
- negative ring
- piece
- ring pipe
- hoisting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
- B66C1/16—Slings with load-engaging platforms or frameworks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
- B66C13/085—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions electrical
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention belongs to the technical field of tunnel construction, and discloses a negative ring pipe piece hoisting and dismantling assembly and a dismantling method. The negative ring pipe piece hoisting and dismantling assembly comprises a first lifting appliance, a second lifting appliance and a third lifting appliance which are respectively used for hoisting the negative ring pipe pieces at the top, the side and the bottom. The first lifting appliance comprises a first lifting rod, a first lifting lug and a locking piece, wherein the first lifting rod penetrates through the negative ring segment, one end of the first lifting rod is detachably connected with the locking piece, and the other end of the first lifting rod is detachably connected with the lifting lug; the second lifting appliance comprises a second lifting rod and a second lifting lug, the second lifting rod penetrates through the negative ring segment, and the second lifting lug is detachably arranged at two ends of the second lifting rod respectively; the third lifting appliance comprises a connecting piece, a third lifting lug and a clamping piece, one end of the connecting piece is connected with the third lifting lug, the other end of the connecting piece is rotationally connected with the clamping piece, and the clamping piece can penetrate through the negative ring segment and is in butt joint with the negative ring segment. The first lifting appliance, the second lifting appliance and the third lifting appliance can hoist and disassemble the negative ring pipe piece at different positions, so that the negative ring pipe piece is efficiently and safely disassembled, smooth disassembly is ensured, and the damage of the pipe piece is avoided.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a negative ring pipe piece hoisting and dismantling assembly and a dismantling method.
Background
Along with the acceleration of urban subway construction, the shield method is applied to tunnel excavation more and more because of the construction safety and high efficiency, and when the shield is started to tunnel, the shield machine is required to forward advance to provide reaction force for tunneling of the shield machine through a back reaction frame and a negative ring, temporary negative ring segments are required to be assembled, and the negative ring segments are required to be dismantled after starting, however, the negative ring segments are low in dismantling efficiency and high in risk difficulty because of special shapes and complex structures, the negative ring segments are easy to damage due to improper dismantling, and the dismantling operation of the negative ring segments is difficult.
Disclosure of Invention
The invention aims to provide a negative ring pipe piece hoisting and dismantling assembly and a dismantling method, which are used for improving the efficiency and safety of dismantling operation of the negative ring pipe piece.
To achieve the purpose, the invention adopts the following technical scheme:
in one aspect, a subassembly is demolishd in hoist and mount of negative ring pipe piece is provided, includes:
the lifting appliance I is used for lifting the negative ring segment at the top and comprises a first lifting rod, a first lifting lug and a locking piece, wherein the first lifting rod penetrates through the negative ring segment, one end of the first lifting rod is detachably connected with the locking piece, and the other end of the first lifting rod is detachably connected with the lifting lug;
the second lifting appliance is used for lifting the negative ring duct piece at the side part and comprises a second lifting rod and a second lifting lug, wherein the second lifting rod penetrates through the negative ring duct piece, and the second lifting lug is detachably arranged at two ends of the second lifting rod respectively;
the third lifting appliance is used for lifting the negative ring segment at the bottom and comprises a connecting piece, a third lifting lug and a clamping piece, one end of the connecting piece is connected with the third lifting lug, the other end of the connecting piece is connected with the clamping piece in a rotating mode, and the clamping piece can penetrate through the negative ring segment and is in butt joint with the negative ring segment.
Optionally, the first hoist is provided with two sets of, two sets of hoist one the interval is installed in the negative ring section of jurisdiction, retaining member and negative ring intraductal cambered surface butt.
Optionally, the third lifting appliance is provided with two groups, two groups of the third lifting appliances are installed on the negative ring segment at intervals, and the clamping piece can be abutted with the outer cambered surface of the negative ring segment.
Optionally, the connecting piece includes the connecting plate that the interval set up, two the one end and the third lug fixed connection of connecting plate, the joint piece is installed through the pivot rotation in two between the connecting plate.
Optionally, the locking member includes a nut, and the first boom is screwed with the nut.
Optionally, the locking piece further comprises a gasket, and the gasket is clamped between the nut and the intrados of the negative ring pipe piece.
Optionally, the first boom and the second boom are long bolts.
Optionally, the lifting rope set is further included, and the first lifting lug, the second lifting lug or the third lifting lug are connected with the lifting device through the lifting rope set.
Optionally, the hoisting rope group comprises hoisting ropes and an electric hoist, and two ends of the electric hoist are respectively connected with the hoisting ropes.
On the other hand, a method for dismantling the negative ring pipe piece is provided, and the assembly for hoisting and dismantling the negative ring pipe piece comprises the following steps:
step S1, installing two groups of lifting appliances on a negative ring segment at the top at intervals, hooking and connecting a lifting rope group with the two lifting appliances, and disassembling the negative ring segment at the top by using a lifting device;
s2, mounting a second lifting appliance on the negative ring segment at the side part, hooking and connecting the lifting rope set with the second lifting appliance, and disassembling the negative ring segment at the side part by using a lifting device;
and S3, installing the two groups of lifting appliances on the negative ring segment at the bottom at three intervals, connecting the lifting rope group with the two groups of lifting appliances in a three-hook manner, and disassembling the negative ring segment at the bottom by using the lifting device.
The invention has the beneficial effects that:
according to the negative ring pipe piece hoisting and dismantling assembly, for the negative ring pipe pieces at different positions, the first hoisting tool, the second hoisting tool and the third hoisting tool are used for hoisting and dismantling, so that the dismantling efficiency of the negative ring pipe pieces is improved, the negative ring pipe pieces are efficiently and safely dismantled, smooth dismantling of the pipe pieces can be ensured, pipe piece breakage is avoided, the negative ring pipe pieces can be used in a turnover mode, and cost is saved.
The hoisting and dismantling assembly is used in the dismantling method of the negative ring duct piece, so that the hoisting and dismantling of the negative ring duct piece is safer and more efficient, the dismantled negative ring duct piece is not easy to damage, and the turnover use of the negative ring duct piece is facilitated.
Drawings
FIG. 1 is a schematic view of a first hanger according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a second lifting appliance according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a third lifting appliance according to an embodiment of the invention;
FIG. 4 is a side view of the construction of a third spreader according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a negative ring segment;
FIG. 6 is a schematic illustration of a first operation for removing a top negative ring segment using a crane;
FIG. 7 is a second schematic illustration of the operation of removing the top negative ring segment using a first spreader;
FIG. 8 is a schematic illustration of the operation of removing a side negative ring segment using a spreader II;
fig. 9 is a schematic diagram of an operation for removing the bottom negative ring segment using the spreader three.
In the figure:
1. a lifting appliance I; 11. a first boom; 12. a first lifting lug; 13. a locking member; 131. a nut; 132. a gasket;
2. a second lifting appliance; 21. a second boom; 22. the second lifting lug;
3. a lifting appliance III; 31. a connecting piece; 311. a connecting plate; 32. the third lifting lug; 33. a clamping piece; 34. a rotating shaft;
4. hoisting rope groups; 41. hoisting ropes; 42. an electric hoist;
100. negative ring segment.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be interpreted broadly, as for example, they may be fixedly connected, or may be detachably connected, or may be electrically connected, or may be directly connected, or may be indirectly connected through an intermediary, or may be in communication with one another in two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1-4, the invention provides a negative ring pipe piece hoisting and dismantling assembly, which comprises a first hoisting tool 1, a second hoisting tool 2 and a third hoisting tool 3. The negative ring segment 100 is structured as shown in fig. 5, and includes negative ring segments 100 numbered L1, L2, B1 and F at the top, negative ring segments 100 numbered B2, B3, B6 and B7 at the sides, and negative ring segments 100 numbered B4 and B5 on the bottom originating bracket. The negative ring segment 100 is provided with pre-buried holes for the hanger to install. The negative ring segment 100 of this embodiment to different positions uses hoist 1, hoist two 2, hoist three 3 to hoist and dismantle to promote and dismantle efficiency, realize safe dismantlement.
Specifically, for the negative ring pipe piece 100 at the top, the first lifting appliance 1 is used for lifting and dismantling, the structure of the first lifting appliance 1 is shown in fig. 1, the first lifting appliance comprises a first lifting rod 11, a first lifting lug 12 and a locking piece 13, the first lifting rod 11 is specifically a long bolt, the first lifting rod can penetrate through a pre-buried hole in the negative ring pipe piece 100, one end of the first lifting rod can be detachably connected with the locking piece 13, and the other end of the first lifting rod can be detachably connected with the lifting lug 12. Optionally, the locking member 13 of the present embodiment includes a nut 131 and a washer 132, where the first boom 11 is screwed with the nut 131, and the washer 132 is clamped between the nut 131 and the intrados of the negative collar piece 100. After the installation, the negative ring segment 100 is clamped between the lifting lug 12 and the locking piece 13, as shown in fig. 5, the negative ring segment 100 at the top is lifted and detached by using the lifting device until the negative ring segment 100 at the top is detached.
Further, for the negative ring segment 100 on the side, since the negative ring segment 100 on the side is in a substantially vertical state, the negative ring segment 100 on the side is easy to turn and swing greatly due to unbalanced stress during hoisting, and therefore, the second hanger 2 with double hanging points is used. The second lifting device 2 is shown in fig. 2, and comprises a second lifting rod 21 and second lifting lugs 22, wherein the second lifting rod 21 is a long bolt, can penetrate through pre-buried holes in the negative ring duct piece 100, two ends of the second lifting rod are respectively connected with the second lifting lugs 22 in a threaded dismounting mode, the negative ring duct piece 100 is clamped between the two second lifting lugs 22, as shown in fig. 8, the lifting device is lifted by the second lifting lugs 22 at two ends of the second lifting rod 21, so that the negative ring duct piece 100 at the side portion is vertically lifted, stress balance is guaranteed, and convenience and safety in lifting are realized.
Further, as shown in fig. 9, for the bottom negative ring pipe piece 100, since the base is disposed under the bottom negative ring pipe piece 100, the hanger cannot adopt a connection mode of bolt fixing, so that the hanger three 3 capable of rotating and locking is adopted to hoist and dismantle the bottom negative ring pipe piece 100. Specifically, as shown in fig. 3 and 4, the third hanger 3 includes a connecting member 31, a third lifting lug 32, and a clip 33. More specifically, the connecting piece 31 includes the connecting plate 311 that the interval set up, the one end and the third lug 32 fixed connection of two connecting plates 311, the joint piece 33 rotates through pivot 34 and installs between two connecting plates 311, joint piece 33 can revolute pivot 34 and rotate, during the use, rotate joint piece 33, make joint piece 33 and connecting piece 31 can penetrate the pre-buried hole of negative ring pipe piece 100, after joint piece 33 wears out the pre-buried hole of negative ring pipe piece 100, because the bracket of starting is installed to the below of bottom negative ring pipe piece 100, joint piece 33 wears out negative ring pipe piece 100 and can rotate with the bracket butt of starting, turn to the vertical state shown in fig. 3, and with the extrados butt of negative ring pipe piece 100, hoist device hoists with third lug 32, realize the hoist and mount dismantlement of bottom negative ring pipe piece 100, promote dismantlement efficiency.
According to the negative ring pipe piece hoisting and dismantling assembly, different hoisting tools are used for hoisting the negative ring pipe pieces at different positions, so that the dismantling efficiency of the negative ring pipe pieces is improved, the negative ring pipe pieces are efficiently and safely dismantled, smooth dismantling of the pipe pieces can be ensured, pipe piece breakage is avoided, the negative ring pipe pieces can be recycled, and the cost is saved.
Optionally, in this embodiment, when the top negative ring pipe 100 is lifted, as shown in fig. 6 and fig. 7, the first lifting device 1 may be provided with two groups, and the second lifting device 1 is installed on the negative ring pipe 100 at intervals, and the locking member 13 abuts against the intrados of the negative ring pipe 100, so as to facilitate the force balance of the lifting of the negative ring pipe 100. Similarly, when the bottom negative ring pipe piece 100 is hoisted, as shown in fig. 9, two groups of lifting devices three 3 are also arranged, the two groups of lifting devices three 3 are installed on the negative ring pipe piece 100 at intervals, and the clamping piece 33 can be abutted with the outer cambered surface of the negative ring pipe piece 100, so that the stress balance in the hoisting process is improved.
The radial dimension of the first hanger rod 11, the radial dimension of the second hanger rod 21, the width dimension of the connecting piece 31 and the width dimension of the clamping piece 33 in this embodiment are all smaller than or equal to the radial dimension of the pre-buried hole of the negative ring segment 100, so that the first hanger rod 11, the second hanger rod 21, the connecting piece 31 and the clamping piece 33 can extend into and pass through the pre-buried hole.
Further, the negative ring pipe sheet hoisting and dismantling assembly further comprises a hoisting rope set 4, and the first lifting lug 12, the second lifting lug 22 or the third lifting lug 32 are connected with a hoisting device through the hoisting rope set 4. Specifically, as shown in fig. 6, the hoisting rope set 4 includes hoisting ropes 41 and electric hoists 42, two ends of each electric hoist 42 are respectively connected with the hoisting ropes 41, each electric hoist 42 can be a 10-ton loop chain electric hoist, the number of the electric hoists 42 can be two, and when in hoisting connection, the heights of left and right hoisting points are different, as shown in fig. 6, 7 and 9, two 10-ton electric hoists 42 are required to be arranged on one side of the hoisting points to adjust the height difference, so that safe hoisting is realized.
In addition, the embodiment also provides a method for dismantling the negative ring pipe piece, which uses the negative ring pipe piece hoisting and dismantling assembly and comprises the following steps:
step S1, as shown in fig. 6 and 7, when the negative ring segment 100 at the top is disassembled, two groups of lifting appliances are arranged on the negative ring segment 100 at the top at intervals of one 1, a lifting rope group 4 is hooked and connected with the two lifting appliances of one 1, the negative ring segment 100 at the top is disassembled by using a lifting device, and the lifting point height difference is adjusted by adjusting the electric hoist 42, so that the safe lifting and the disassembly of the negative ring segment 100 at the top are realized;
step S2, as shown in FIG. 8, after the negative ring segment 100 at the top is removed, a second lifting appliance 2 is installed on the negative ring segment 100 at the side part, a lifting rope set 4 is hooked and connected with the second lifting appliance 2, and the negative ring segment 100 at the side part is removed by using a lifting device in the same way;
step S3, as shown in FIG. 9, after the negative ring segment 100 on the side is removed, two groups of lifting devices are installed on the negative ring segment 100 on the bottom at intervals of three 3, the lifting rope group 4 is hooked with the two groups of lifting devices, the negative ring segment 100 on the bottom is detached by using the lifting device, and the height difference is adjusted by adjusting the electric hoist 42, so that the safe lifting and removal of the negative ring segment 100 on the bottom are realized.
The hoisting and dismantling assembly is used in the dismantling method of the negative ring duct piece, so that the hoisting and dismantling of the negative ring duct piece is safer and more efficient, the dismantled negative ring duct piece is not easy to damage, and the turnover use of the negative ring duct piece is facilitated.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The subassembly is demolishd in negative ring pipe piece hoist and mount, a serial communication port includes:
the first lifting appliance (1) is used for lifting a negative ring pipe piece (100) at the top and comprises a first lifting rod (11), a first lifting lug (12) and a locking piece (13), wherein the first lifting rod (11) penetrates through the negative ring pipe piece (100), one end of the first lifting rod is detachably connected with the locking piece (13), and the other end of the first lifting rod is detachably connected with the lifting lug (12);
the second lifting appliance (2) is used for lifting the negative ring pipe piece (100) at the side part, the second lifting appliance (2) comprises a second lifting rod (21) and a second lifting lug (22), the second lifting rod (21) penetrates through the negative ring pipe piece (100), and the second lifting lugs (22) are respectively detachably arranged at two ends of the second lifting rod;
the lifting appliance III (3) is used for lifting the negative ring pipe piece (100) at the bottom, the lifting appliance III (3) comprises a connecting piece (31), a third lifting lug (32) and a clamping piece (33), one end of the connecting piece (31) is connected with the third lifting lug (32), the other end of the connecting piece is rotationally connected with the clamping piece (33), and the clamping piece (33) can penetrate through the negative ring pipe piece (100) and is in butt joint with the negative ring pipe piece (100).
2. The assembly for hoisting and dismantling the negative ring pipe piece according to claim 1, wherein the first lifting appliance (1) is provided with two groups, the second lifting appliance (1) is installed on the negative ring pipe piece (100) at intervals, and the locking piece (13) is abutted with the intrados of the negative ring pipe piece (100).
3. The assembly for hoisting and dismantling the negative ring pipe piece according to claim 1, wherein the lifting tool III (3) is provided with two groups, the lifting tool III (3) of two groups is installed on the negative ring pipe piece (100) at intervals, and the clamping piece (33) can be abutted with the extrados of the negative ring pipe piece (100).
4. The assembly according to claim 1, wherein the connecting members (31) comprise connecting plates (311) arranged at intervals, one ends of the two connecting plates (311) are fixedly connected with the third lifting lugs (32), and the clamping members (33) are rotatably mounted between the two connecting plates (311) through rotating shafts (34).
5. The negative collar tab hoisting removal assembly of claim 1, characterized in that the locking member (13) comprises a nut (131), the first boom (11) being in threaded connection with the nut (131).
6. The negative collar piece hoisting and dismantling assembly according to claim 5, characterized in that the locking piece (13) further comprises a gasket (132), wherein the gasket (132) is clamped between the nut (131) and the intrados surface of the negative collar piece (100).
7. The negative collar hoisting demolition assembly according to claim 1, characterized in that the first boom (11) and the second boom (21) are long bolts.
8. A negative loop pipe hoisting demolition assembly according to claim 2 or 3, characterized in that it further comprises a hoisting rope set (4), said first lifting lug (12), said second lifting lug (22) or said third lifting lug (32) being connected to a hoisting device by means of said hoisting rope set (4).
9. The negative ring pipe hoisting and dismantling assembly according to claim 8, wherein the hoisting rope group (4) comprises hoisting ropes (41) and an electric hoist (42), and two ends of the electric hoist (42) are respectively connected with the hoisting ropes (41).
10. A method for removing a negative ring pipe piece, characterized in that the negative ring pipe piece hoisting and removing assembly according to any one of claims 1-9 is used, comprising the following steps:
step S1, two groups of lifting devices I (1) are arranged on a negative ring segment (100) at the top at intervals, a lifting rope group (4) is hooked and connected with the two lifting devices I (1), and the negative ring segment (100) at the top is detached by using a lifting device;
s2, mounting a second lifting appliance (2) on the negative ring segment (100) at the side part, hooking and connecting the lifting rope group (4) with the second lifting appliance (2), and disassembling the negative ring segment (100) at the side part by using a lifting device;
and S3, installing the two groups of lifting devices III (3) on the negative ring segment (100) at the bottom at intervals, hooking and connecting the lifting rope group (4) with the two groups of lifting devices III (3), and disassembling the negative ring segment (100) at the bottom by using the lifting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310208617.1A CN116216493A (en) | 2023-03-07 | 2023-03-07 | Negative ring pipe piece hoisting and dismantling assembly and dismantling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310208617.1A CN116216493A (en) | 2023-03-07 | 2023-03-07 | Negative ring pipe piece hoisting and dismantling assembly and dismantling method |
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| Publication Number | Publication Date |
|---|---|
| CN116216493A true CN116216493A (en) | 2023-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310208617.1A Pending CN116216493A (en) | 2023-03-07 | 2023-03-07 | Negative ring pipe piece hoisting and dismantling assembly and dismantling method |
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| CN (1) | CN116216493A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464488A (en) * | 2023-06-19 | 2023-07-21 | 中建铁投轨道交通建设有限公司 | Negative ring pipe piece oblique pushing assisting dismounting device, system and dismounting method thereof |
-
2023
- 2023-03-07 CN CN202310208617.1A patent/CN116216493A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464488A (en) * | 2023-06-19 | 2023-07-21 | 中建铁投轨道交通建设有限公司 | Negative ring pipe piece oblique pushing assisting dismounting device, system and dismounting method thereof |
| CN116464488B (en) * | 2023-06-19 | 2023-09-05 | 中建铁投轨道交通建设有限公司 | Negative ring pipe piece oblique pushing assisting dismounting device, system and dismounting method thereof |
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