CN111173524A - Splicing counterforce device for starting shield in tunnel and negative ring pipe piece dismantling method - Google Patents

Splicing counterforce device for starting shield in tunnel and negative ring pipe piece dismantling method Download PDF

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Publication number
CN111173524A
CN111173524A CN202010107529.9A CN202010107529A CN111173524A CN 111173524 A CN111173524 A CN 111173524A CN 202010107529 A CN202010107529 A CN 202010107529A CN 111173524 A CN111173524 A CN 111173524A
Authority
CN
China
Prior art keywords
tunnel
shield
bolt
counterforce
unloading block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010107529.9A
Other languages
Chinese (zh)
Inventor
付智多
李晋
耿晓亮
唐立宪
郑永杰
陈万全
于在洋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rail Transit Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
Original Assignee
Rail Transit Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rail Transit Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd filed Critical Rail Transit Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
Priority to CN202010107529.9A priority Critical patent/CN111173524A/en
Publication of CN111173524A publication Critical patent/CN111173524A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/0607Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/003Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/08Lining with building materials with preformed concrete slabs
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/08Lining with building materials with preformed concrete slabs
    • E21D11/083Methods or devices for joining adjacent concrete segments
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/40Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/0621Shield advancing devices

Abstract

The invention provides a splicing counterforce device for shield initiation in a tunnel and a negative ring pipe piece dismantling method, wherein the device comprises the following components: the outer edges of the butt joint surfaces of the two adjacent force unloading block units are respectively formed with connecting plates, bolt connecting holes are formed in each connecting plate at intervals, and the two adjacent force unloading block units are connected and fastened by penetrating the bolt connecting holes in each connecting plate through fastening bolts; the first surface of the force unloading block unit, which deviates from the butt joint surface, is fixedly provided with a segment connecting bolt for penetrating and connecting with an embedded bolt hole of a negative ring segment, and the force unloading block unit is provided with a second surface, which deviates from the butt joint surface and is in close contact with a concrete structure of an underground excavated tunnel. The invention overcomes the defects that the conventional method for installing the counter-force supporting system is not firm in installation and needs to be cut and dismantled and the traditional counter-force supporting system is used to cause difficulty in dismantling the negative ring pipe piece, optimizes the construction process and obviously improves the operation efficiency.

Description

Splicing counterforce device for starting shield in tunnel and negative ring pipe piece dismantling method
Technical Field
The invention relates to the technical field of building construction, in particular to a splicing counterforce device for shield initiation in a tunnel and a negative ring pipe piece dismantling method.
Background
At present, rail transit such as subway has become one of the main development directions of the modern city construction of our country. The shield method construction is widely applied to the construction of tunnels in subway sections by virtue of the advantages of higher safety, higher working efficiency, smaller influence on the surrounding environment, high construction speed, guaranteed quality, higher economy and the like. With the continuous progress of the shield construction technology level, the shield starting conditions and the shield starting modes are diverse and different, and can be roughly divided into two types: one is initiated in a station shield originating well, and the other is initiated in a tunnel constructed by a mining method. The starting mode in the mine construction tunnel is divided into a straight starting mode (starting by coincidence of the central line of the starting shield body and the central line of the tunnel) and a curve starting mode (starting by incomplete coincidence of the central line of the starting shield body and the central line of the tunnel or starting positions on a gentle curve section of the curve). If the shield machine is started in the tunnel constructed by the mining method, a shield starting working well and a starting transverse passage are usually correspondingly arranged in the section, one side of the transverse passage is the shield method section, and the other side of the transverse passage is the mining method section. And hoisting the shield machine in the shield starting working well, adopting subsection hoisting to lower the well, translating to a specified excavation line inlet of the transverse passage after the shield body and the cutter head of the shield machine are hoisted to lower the well and are assembled, and starting work can be carried out when other work is ready. When the shield construction starts to drive, the shield machine is propelled forwards, and a reaction force is required to be provided for the driving of the shield machine through the back reaction force supporting system, and the reaction force supporting system plays a role in lifting.
In the shield starting construction process, some common and difficult-to-solve problems are often encountered, such as various problems of selection of setting forms of the counterforce support system, how to install and remove the counterforce support system, how to smoothly remove the negative ring pipe piece and the like when the shield machine needs to start in a straight form or a curve form in a limited operation space in a standard horseshoe tunnel constructed by a mine method. In the shield starting construction, the stability of the structure is the key for ensuring that the shield machine does not deform, and is also a decisive factor for ensuring that the central axis of the tunnel does not deviate, and the counter-force support structure plays a crucial role in the process. If the counter-force supporting system is improperly arranged in the construction process, the underground excavated tunnel concrete structure is easily damaged, the normal service life of the underground excavated tunnel concrete structure is influenced, and the normal safe starting of the shield is also influenced.
In the actual shield starting construction process, in order to effectively solve the above problems, some traditional measures are often adopted. If often can adopt the form of bedding steel sheet between burden ring section of jurisdiction and undercut tunnel structure, let its burden ring section of jurisdiction direct action contact on the steel sheet plane to provide the holding surface of counter-force, avoid the structure to suffer the concentrated counter-force that the shield constructs the propulsion and cause the unexpected destruction of undercut tunnel structure, thereby ensure that the shield constructs safe smooth originating, when treating that the shield constructs the quick-witted tunnelling to 50 ~ 60 rings, can cut it and demolish. Practice proves that the method has a plurality of defects, on one hand, because the operation space in the tunnel is limited, the tunnel is not suitable for fixing when the bedding steel plate is arranged, the safety and stability of the steel plate cannot be ensured, and certain danger is caused; on the other hand, due to the propelling of the shield, the negative ring duct piece is tightly fastened and stressed with the bedding steel plate and the underground excavated tunnel structure, and the moving space of the duct piece is limited in the process of dismantling the negative ring duct piece, so that the dismantling of the negative ring duct piece is difficult; secondly, if the shield machine starts in a curve form in a standard horseshoe-shaped tunnel constructed by a mining method, uneven gaps and included angles can be generated between the negative ring duct piece and the underground excavated tunnel structure surface, so that gaps at different point positions are different in size, and the bedding steel plate can not meet construction conditions.
Disclosure of Invention
In view of the above circumstances, the present invention provides a splicing reaction device for shield initiation in a tunnel and a method for detaching a negative ring pipe piece, which solve the technical problems of the existing reaction device that have the above disadvantages.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a shield is originated with concatenation counterforce device based on in tunnel includes:
the force unloading block body comprises at least two force unloading block units which are connected in a splicing manner, connecting plates are respectively formed on the outer edges of the butt joint surfaces of the two adjacent force unloading block units, bolt connecting holes are formed in each connecting plate at intervals, and the two adjacent force unloading block units are connected and fastened through fastening bolts penetrating through the bolt connecting holes in the connecting plates;
the first surface of the force unloading block unit, which deviates from the butt joint surface, is fixedly provided with a segment connecting bolt for penetrating and connecting with an embedded bolt hole of a negative ring segment, and the force unloading block unit is provided with a second surface, which deviates from the butt joint surface and is in close contact with a concrete structure of an underground excavated tunnel.
In an embodiment of the present invention, pad plates are respectively fixed on the first surface and the second surface, and a size of each pad plate is larger than that of the first surface and that of the second surface.
In the embodiment of the invention, the duct piece connecting bolt is also provided with a bolt hole sealing ring.
In the embodiment of the invention, the duct piece connecting bolt is also provided with a bolt washer.
In the embodiment of the invention, the duct piece connecting bolt is an arc-shaped rod with the radian identical to that of the embedded bolt hole.
The invention also provides a method for dismantling the negative ring pipe piece, which comprises the following steps:
providing the splicing counterforce device for initiating the shield in the tunnel;
installing the splicing counterforce device for initiating the shield in the tunnel between the underground excavated tunnel concrete structure and the negative ring pipe piece at intervals along the section of the underground excavated tunnel concrete structure, and performing tunneling by a shield machine;
after the tunneling of the shield tunneling machine is finished, removing the fastening bolts, removing the connection relation between the force unloading block unit closely attached to the concrete structure of the underground excavated tunnel and the adjacent force unloading block unit, removing the force unloading block unit closely attached to the concrete structure of the underground excavated tunnel, finally extracting the segment connecting bolts, and removing the force unloading block unit connected with the negative ring segment;
and removing the negative ring pipe piece.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) the splicing counterforce device for the shield initiation in the tunnel has the advantages of simple structure, convenient use and operation, and rapid connection, installation and removal, reduces the labor intensity, overcomes the defects of insecure installation of a counterforce support system and the need of cutting and removal in the conventional method, and causes difficulty in dismantling a negative ring pipe sheet by using the conventional counterforce support system, optimizes the construction process, and obviously improves the operation efficiency; the device can be used in a turnover mode, is economical and practical, and reduces resource waste.
(2) The splicing counterforce device for shield initiation in the tunnel is provided with the segment connecting bolt member, so that the connection is safe and reliable, and the stability of the device in use is greatly improved.
(3) The device has strong applicability, breaks the limitation of application of methods such as steel plate paving and the like, and is suitable for shield initiation in various forms (in limited space and in curved forms in a tunnel).
(4) The device is simple to manufacture, can be welded and assembled by using local materials on the construction site, reduces the construction cost and fully embodies the economy and the practicability.
Drawings
Fig. 1 is a schematic front view of a splicing reaction device for shield initiation in a tunnel according to the invention.
Fig. 2 is a schematic view of the use state of the splicing counterforce device for shield initiation in the tunnel.
Fig. 3 is a three-dimensional schematic diagram of a splicing counterforce device for shield initiation in a tunnel.
Fig. 4 is a schematic structural view of the segment connecting bolt of the present invention.
FIG. 5 is a schematic cross-sectional view of a negative ring segment of the present invention.
Fig. 6 is a schematic sectional view of the concrete structure of the underground excavated tunnel according to the present invention.
The correspondence of reference numerals to components is as follows:
a force-releasing block unit 1; a connecting plate 11; a backing plate 12; a fastening bolt 2; segment connecting bolts 3; a bolt washer 31; bolt hole seal rings 32; a negative ring canal sheet 4; pre-burying the bolt holes 41; a fastening nut 5; the tunnel concrete structure 6 is excavated.
Detailed Description
To facilitate an understanding of the present invention, the following description is made in conjunction with the accompanying drawings and examples.
Referring to fig. 1 to 3, the present invention provides a splicing counterforce device for shield initiation in a tunnel, including:
the outer edges of the butt joint surfaces of the two adjacent force unloading block units 1 are respectively provided with a connecting plate 11, bolt connecting holes are arranged on each connecting plate 11 at intervals, and the two adjacent force unloading block units 1 are connected and fastened by penetrating the bolt connecting holes on each connecting plate 11 through fastening bolts 2;
and a duct piece connecting bolt 3 for penetrating and connecting with a pre-embedded bolt hole 41 of a negative ring duct piece 4 is fixed on a first surface of the force unloading block unit 1, which is far away from the butt joint surface, and the force unloading block unit 1 is provided with a second surface, which is far away from the butt joint surface, for closely contacting with a concrete structure 6 of an underground excavated tunnel.
In the embodiment of the present invention, the first surface and the second surface are respectively fixed with a pad 12, and the size of each pad 12 is larger than that of the first surface and that of the second surface. The setting of backing plate 12 does benefit to the increase unload power piece unit 1 with the anion pipe piece 4 the area of contact of undercut tunnel concrete structure 6 avoids anion pipe piece 4 undercut tunnel concrete structure 6 receives the shield constructs too big stress when machine push-up effect, structural damage.
In the embodiment of the invention, the connecting plate 11 and the backing plate 12 are both made of steel plates with the thickness of 2cm, and after the specific size is determined according to the actual situation on site, the cutting and material taking are carried out manually. Three bolt connecting holes matched with the diameters of the fastening bolts 2 are reserved on two opposite sides of the connecting plate 11 respectively.
In the embodiment of the invention, the force unloading block unit 1 is formed by welding four rectangular steel plates, and the connecting plate 11 and the backing plate 12 are respectively fixed at two opposite ends of the force unloading block unit 1, so that the force unloading block unit 1 is surrounded to form a closed cavity; the force-unloading block unit 1 must have sufficient strength and rigidity to meet the requirements of shield tunneling thrust extrusion.
In the embodiment of the invention, as shown in fig. 4, a fastening nut 5 is arranged on the segment connecting bolt 3; the segment connecting bolt 3 is also provided with a bolt washer 31; the segment connecting bolt 3 is also provided with a bolt hole sealing ring 32; the segment connecting bolt is an arc-shaped rod with the same radian as the embedded bolt hole 41. The segment connecting bolt 3 is made of connecting bolts which are the same as those of segment assembling, and the segment connecting bolt 3 and the force unloading block unit 1 are fixed through welding; the length of the segment connecting bolt 3 can be intercepted according to actual needs.
In the embodiment of the present invention, as shown in fig. 5, which is a schematic cross-sectional view of the negative ring segment 4 of the present invention, the splicing reaction devices are disposed corresponding to the pre-buried bolt holes 41, and the number of the splicing reaction devices can be reduced as required; preferably, the splicing counterforce device is symmetrically arranged between the negative ring pipe piece 4 and the underground excavated tunnel concrete structure 6; the section of the underground excavated tunnel concrete structure 6 is horseshoe-shaped as shown in fig. 6.
In the embodiment of the invention, the wall thickness of the negative ring pipe sheet 4 is 300mm, and the size of the force unloading block unit 1 is 400mm multiplied by 400 mm.
Unload power piece unit 1 and negative ring pipe piece 4, the area of contact of undercut tunnel concrete structure 6 compares and adopts a monoblock steel sheet clamp to locate the area of contact between negative ring pipe piece and the undercut tunnel concrete structure little among the prior art, and this application concatenation counterforce device arranges along undercut tunnel concrete structure section interval, mutual independence between each other, loose adjacent 2 backs of fastening bolt between the power piece unit 1 of unloading, although concatenation counterforce device is in the close-fitting state, only need use less effort to strike and just can will unload power piece unit 1 between the position of staggering, alright demolish concatenation counterforce device, all the other concatenation counterforce devices are demolishd to the repetition so.
The structure of the splicing reaction device for shield initiation in the tunnel according to the present invention is described above specifically, and the method of using the splicing reaction device for shield initiation in the tunnel according to the present invention is described below, and the method includes the following steps:
providing the splicing counterforce device for initiating the shield in the tunnel;
installing the splicing counterforce device for initiating the shield in the tunnel between the underground excavated tunnel concrete structure 6 and the negative ring pipe piece 4 at intervals along the section of the underground excavated tunnel concrete structure 6, and performing tunneling by the shield machine;
specifically, according to the distance between the standard ring of the negative ring pipe sheet and the underground excavated tunnel concrete structure 6, the force unloading block units 1 with proper length are selected for splicing;
after the first ring negative ring pipe piece 4 is assembled, the pipe piece connecting bolt 3 penetrates into a pre-buried bolt hole 41 of the negative ring pipe piece 4, and the end part of the pipe piece connecting bolt 3 far away from the force unloading block unit 1 penetrates out of the pre-buried bolt hole 41 and is fastened with a fastening nut 5; preferably, before the fastening nut 5 is screwed in, a bolt hole sealing ring 32 and a bolt washer 31 are inserted into the end part of the segment connecting bolt 3 to ensure the sealing performance of the pre-embedded bolt hole 41 and avoid the stress concentration between the fastening nut 5 and the negative ring pipe piece 4 to damage the structure of the negative ring pipe piece 4;
after the installation and connection of the splicing counterforce device are finished, the first negative ring pipe piece 4 is pushed out of the shield tail by a propulsion oil cylinder, when the splicing counterforce device is pushed, the stroke of the propulsion oil cylinder is controlled to be kept consistent as much as possible, certain thrust is applied to tightly press the first negative ring pipe piece 4 and the splicing counterforce device on the surface of the underground excavation tunnel concrete structure 6, mutual adhesion between the first negative ring pipe piece and the splicing counterforce device is ensured, so that the counterforce of forward tunneling of the shield tunneling machine is provided, the shield tunneling machine is ensured to be capable of smoothly pushing forward, and the installation of the next ring pipe piece can be;
after the tunneling of the shield tunneling machine is finished, the fastening bolts 2 are removed, the connection relation between the force unloading block unit 1 closely attached to the underground excavated tunnel concrete structure 6 and the adjacent force unloading block unit 1 is removed, the force unloading block unit 1 closely attached to the underground excavated tunnel concrete structure 6 is removed, finally the pipe piece connecting bolts 5 are drawn out, the force unloading block unit 1 connected with the negative circular pipe piece 4 is removed, and the space between the negative circular pipe piece 4 and the underground excavated tunnel concrete structure 6 is released;
specifically, in the actual construction process, when the shield machine tunnels to 50-60 rings, the negative ring pipe piece 4 can be removed, when the shield machine tunnels, the force-removing block unit 1 adjacent to the underground excavation tunnel concrete structure 6 is removed, the nut on the fastening bolt 2 for fixing the force-removing block unit 1 is unscrewed, so that the connection relation between the adjacent force-removing block units 1 is released, the force-removing block unit 1 closely attached to the underground excavation tunnel concrete structure 1 is removed, specifically, because the opposite end of the force-removing block unit 1 closely attached to the underground excavation tunnel concrete structure 6 is contacted with the adjacent force-removing block unit 1, because the contact area between the adjacent force-removing block units 1 is small, the position between the two force-removing block units 1 can be staggered only by lightly knocking, the force-removing block unit 1 closely attached to the underground excavation tunnel concrete structure is smoothly removed, then sequentially removing the rest of the force-removing block units 1, and finally removing the force-removing block units 1 connected with the negative ring pipe pieces 4;
screwing off the fastening nut 5 on the segment connecting bolt 3, and dismantling the force unloading block unit 1 connected with the negative ring pipe segment 4; specifically, the method further comprises the steps of removing the bolt washer 31 and the bolt hole sealing ring 32; when the splicing counterforce device is detached, the operation is careful, and the components are prevented from sliding off and hurting people;
and (4) removing the negative ring pipe piece.
According to the invention, the force-unloading block unit 1 and the rest force-unloading block units closely attached to the underground excavated tunnel concrete structure 6 can be conveniently and quickly detached by adopting the splicing counterforce device, so that a space is provided for detaching the negative ring pipe piece 4, the operation condition of detaching the negative ring pipe piece 4 is met, the negative ring pipe piece 4 can be smoothly detached, and the operation efficiency of detaching the negative ring pipe piece 4 is effectively improved.
While the present invention has been described in detail and with reference to the accompanying drawings and examples, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.

Claims (6)

1. The utility model provides a shield is originated and is used concatenation counterforce device based on in tunnel, its characterized in that includes:
the outer edges of the butt joint surfaces of the two adjacent force unloading block units are respectively formed with connecting plates, bolt connecting holes are formed in each connecting plate at intervals, and the two adjacent force unloading block units are connected and fastened by penetrating the bolt connecting holes in each connecting plate through fastening bolts;
the first surface of the force unloading block unit, which deviates from the butt joint surface, is fixedly provided with a segment connecting bolt for penetrating and connecting with an embedded bolt hole of a negative ring segment, and the force unloading block unit is provided with a second surface, which deviates from the butt joint surface and is in close contact with a concrete structure of an underground excavated tunnel.
2. The splicing reaction device for initiating a shield in a tunnel according to claim 1, wherein a backing plate is fixed on each of the first surface and the second surface, and the size of each backing plate is larger than that of each of the first surface and the second surface.
3. The splicing counterforce device for shield initiation in a tunnel according to claim 1, wherein a bolt hole sealing ring is further arranged on the segment connecting bolt.
4. The sand box counterforce device for shield initiation in a tunnel according to claim 1, wherein a bolt washer is further provided on the segment connecting bolt.
5. The sand box counterforce device for shield initiation in a tunnel according to claim 1, wherein the segment connecting bolt is an arc-shaped rod with the same radian as the embedded bolt hole.
6. A negative ring pipe piece dismantling method is characterized by comprising the following steps:
providing the splicing counterforce device for shield initiation in the tunnel according to any one of claims 1 to 5;
installing the splicing counterforce device for initiating the shield in the tunnel between the underground excavated tunnel concrete structure and the negative ring pipe piece at intervals along the section of the underground excavated tunnel concrete structure, and performing tunneling by a shield machine;
after the tunneling of the shield tunneling machine is finished, removing the fastening bolts, removing the connection relation between the force unloading block unit closely attached to the concrete structure of the underground excavated tunnel and the adjacent force unloading block unit, removing the force unloading block unit closely attached to the concrete structure of the underground excavated tunnel, finally extracting the segment connecting bolts, and removing the force unloading block unit connected with the negative ring segment;
and removing the negative ring pipe piece.
CN202010107529.9A 2020-02-21 2020-02-21 Splicing counterforce device for starting shield in tunnel and negative ring pipe piece dismantling method Pending CN111173524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010107529.9A CN111173524A (en) 2020-02-21 2020-02-21 Splicing counterforce device for starting shield in tunnel and negative ring pipe piece dismantling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010107529.9A CN111173524A (en) 2020-02-21 2020-02-21 Splicing counterforce device for starting shield in tunnel and negative ring pipe piece dismantling method

Publications (1)

Publication Number Publication Date
CN111173524A true CN111173524A (en) 2020-05-19

Family

ID=70653181

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010107529.9A Pending CN111173524A (en) 2020-02-21 2020-02-21 Splicing counterforce device for starting shield in tunnel and negative ring pipe piece dismantling method

Country Status (1)

Country Link
CN (1) CN111173524A (en)

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